CN119050520B - Battery cell, battery and electricity utilization device - Google Patents

Abstract

The application relates to a battery cell, a battery and an electric device. The battery unit comprises a battery core and a circuit assembly, the circuit assembly is in conductive connection with the battery core to form an energy storage loop, the circuit assembly comprises an energy storage element and a circuit switch, the circuit switch is connected with the energy storage element in series, the circuit switch is in an open state to enable the energy storage loop to be in an open state under the condition that the air pressure in the battery unit is smaller than a first air pressure threshold value, the circuit switch is in a closed state to enable the energy storage loop to be in a conducting state under the condition that the air pressure in the battery unit is larger than or equal to the first air pressure threshold value, the energy storage element is configured to store electric energy when the energy storage loop is conducted, the circuit switch comprises an air bag, the air bag is filled with air, the air pressure in the air bag is smaller than the first air pressure threshold value, and the air bag is configured to deform in response to the air pressure change in the battery unit to conduct or cut off the energy storage loop. The battery monomer provided by the application is provided with the energy storage loop, so that the charge quantity of the battery core can be reduced when the battery core generates rapid gas production.

Description

Battery cell, battery and electricity utilization device

Technical Field

The application relates to the technical field of battery safety, in particular to a battery cell, a battery and an electric device.

Background

The safety performance of the battery as an energy storage device is extremely important. In the related art, in misuse situations such as safety test, overcharge and overdischarge, and the use of a full life cycle, when thermal runaway occurs in a battery, severe gas generation often occurs. When the battery rapidly generates gas, the internal pressure of the battery is increased, and safety problems such as ignition and explosion of the battery are easily caused.

Disclosure of Invention

In view of the above problems, the present application provides a battery cell, a battery and an electricity consumption device, which can reduce the charge of a battery core when the battery rapidly generates gas, and reduce the risk of ignition and explosion of the battery.

The application provides a battery cell, which comprises a battery cell and a circuit assembly, wherein the circuit assembly is in conductive connection with the battery cell to form an energy storage loop, the circuit assembly comprises an energy storage element and a circuit switch, the circuit switch is connected with the energy storage element in series, the circuit switch is in an open state to enable the energy storage loop to be in an open state when the air pressure in the battery cell is smaller than a first air pressure threshold value, the circuit switch is in a closed state to enable the energy storage loop to be in a conducting state when the air pressure in the battery cell is larger than or equal to the first air pressure threshold value, the energy storage element is configured to store electric energy when the energy storage loop is conducted, the circuit switch comprises an air bag, the air bag is filled with air, the air pressure in the air bag is smaller than the first air pressure threshold value, and the air bag is configured to deform in response to change of the air pressure in the battery cell so as to conduct or cut off the energy storage loop.

According to the technical scheme, the circuit assembly is connected with the battery cell in a conductive mode, and the circuit switch is arranged to respond to the air pressure change in the battery cell, so that the circuit assembly can be conducted when the air pressure in the battery cell rises to reach the first air pressure threshold value, the circuit assembly and the battery cell form a conducted energy storage loop, the battery cell can be discharged, and the storage and consumption of the residual electric quantity of the battery cell are realized. Therefore, the electric charge of the battery core can be reduced when the battery core rapidly generates gas, the risk of ignition and explosion of the battery monomer is further reduced, and the safety performance of the battery monomer can be improved. The circuit switch can sense the air pressure change in the battery cell through the air bag so as to control the switch state of the circuit switch in response to the air pressure change in the battery cell, so that the structure of the circuit switch can be simplified, the reliability of the circuit switch is improved, and the cost can be reduced.

In some embodiments, the circuit switch further comprises a conductive member and a switching member, wherein one end of the conductive member is positioned in the air bag, the other end of the conductive member is positioned outside the air bag, the conductive member is used for connecting the circuit switch in series in the circuit assembly, the switching member is arranged in the air bag, compression deformation of the air bag can drive the switching member to move to be close to the conductive member, the switching member moves to be in conductive contact with the conductive member under the condition that the air pressure in the battery cell is greater than or equal to a first air pressure threshold value, the circuit switch is closed, and the switching member is separated from the conductive member under the condition that the air pressure in the battery cell is less than the first air pressure threshold value, so that the circuit switch is opened. Therefore, an air bag switch structure is formed, the air bag can deform to drive the switch piece to move, so that the switch piece can act under the action of pressure to move to be connected with or separated from the conductive piece, the switch state of the control circuit switch is realized, the structure of the circuit switch can be simplified, the reliability of the circuit switch is improved, and the cost can be reduced.

In some embodiments, the circuit assembly further comprises a wire, a first electrical connector and a second electrical connector, the first electrical connector, the energy storage element, the circuit switch and the second electrical connector are connected in series through the wire, and the first electrical connector and the second electrical connector are electrically connected with the battery cell. Therefore, the circuit assembly has a simple and compact structure, can save occupied space and is beneficial to reducing cost.

In some embodiments, the battery cell further comprises a pressure relief mechanism for relieving the pressure inside the battery cell when the air pressure inside the battery cell reaches a second air pressure threshold, the second air pressure threshold being greater than or equal to the first air pressure threshold. Therefore, the triggering air pressure value of the conducting energy storage loop is smaller than or equal to the opening pressure value of the opening pressure relief mechanism, the energy storage loop can be conducted before the pressure relief mechanism is opened in the process of rising the air pressure in the battery cell, the effectiveness of the energy storage loop can be improved, the energy storage loop can exert the electricity storage function, the storage and consumption of the electric quantity of the electric cell are realized, the electric quantity of the electric cell can be reduced, the risk of ignition and explosion of the battery cell is reduced, and the safety performance is improved.

In some embodiments, the battery cell further comprises a shell and an end cover, the end cover covers the opening of the shell, the shell and the end cover enclose a containing space, the battery cell is contained in the containing space, and the circuit assembly is arranged in the containing space and is positioned between the end cover and the battery cell. Therefore, the circuit assembly can provide a larger installation space for the circuit assembly, and an energy storage element with a larger size can be used, so that the energy storage capacity is larger, the electric quantity of the battery cell can be stored and consumed more, and the effect of reducing the electric quantity of the battery cell is better.

In some embodiments, the battery cell further includes a first insulator disposed on the inner side of the end cap in a stacked manner, and the circuit assembly is disposed on the first insulator. Therefore, an installation foundation can be provided for the circuit component, the circuit component is convenient to assemble in the battery cell, and the assembly efficiency can be improved.

In some embodiments, the battery cell comprises a battery cell body, a first tab and a second tab connected to the battery cell body, the battery cell further comprises a first electrode, a second electrode, a first adapter and a second adapter, the first adapter is connected between the first electrode and the first tab, the second adapter is connected between the second electrode and the second tab, the first electrode and the second electrode are used for outputting or inputting electric energy of the battery cell, and the circuit assembly is connected in series between the first adapter and the second adapter. Therefore, the circuit assembly can provide a larger installation space for the circuit assembly, can use an energy storage element with larger size, has larger storage capacity, can store and consume the electric quantity of the battery cell more, has better effect of reducing the electric quantity of the battery cell, has simple installation structure of the circuit assembly and is beneficial to reducing the cost.

In some embodiments, the battery cell comprises a battery cell body, a first tab and a second tab connected to the battery cell body, and a circuit assembly connected in series between the first tab and the second tab. Therefore, the circuit assembly can provide a larger installation space for the circuit assembly, can use an energy storage element with larger size, has larger storage capacity, can store and consume the electric quantity of the battery cell more, has better effect of reducing the electric quantity of the battery cell, has simple installation structure of the circuit assembly and is beneficial to reducing the cost.

In a second aspect, the present application provides a battery comprising a cell according to any one of the embodiments described above.

In a third aspect, the present application provides an electric device, where the electric device includes a battery in the foregoing embodiment or a battery unit in any one of the foregoing embodiments, and the battery unit are used to provide electric energy.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

Fig. 1 is a schematic structural view of a vehicle according to some embodiments of the present application.

Fig. 2 is an exploded view of a battery according to some embodiments of the present application.

Fig. 3 is an exploded view of a battery cell according to some embodiments of the present application.

Fig. 4 is a cross-sectional view of a battery cell according to some embodiments of the present application.

Fig. 5 is a schematic structural diagram of a circuit assembly according to some embodiments of the present application.

Fig. 6 is a schematic structural diagram of a circuit switch in an off state according to some embodiments of the present application.

Fig. 7 is a schematic structural diagram of a circuit switch in a closed state according to some embodiments of the present application.

Fig. 8 is a top view of an end cap provided in some embodiments of the application.

Fig. 9 is a cross-sectional view of section A-A of fig. 8.

Fig. 10 is a bottom view of an end cap provided in accordance with some embodiments of the present application.

Fig. 11 is a schematic diagram of a circuit assembly provided on a first insulating member according to some embodiments of the present application.

Fig. 12 is a schematic diagram of a circuit assembly provided in some embodiments of the application connected in series between a first adapter and a second adapter.

Fig. 13 is a schematic diagram of a circuit assembly according to another embodiment of the present application connected in series between a first adapter and a second adapter.

Fig. 14 is a schematic diagram of a circuit assembly according to still another embodiment of the present application connected in series between a first adapter and a second adapter.

Fig. 15 is a schematic diagram of a circuit assembly connected in series between a first tab and a second tab according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

1000. 100 parts of a vehicle, 200 parts of a battery, 200 parts of a controller, 300 parts of a motor;

10. The box body, 11, the first part, 12, the second part;

20. Battery cell, 21, electric core, 211, electric core body, 212, first tab, 213, second tab, 22, circuit component, 221, energy storage element, 222, circuit switch, 2221, air bag, 2222, conductive piece, 2223, switch piece, 223, wire, 224, first electrical connector, 225, second electrical connector, 23, shell, 231, opening, 24, end cover, 241, first electrode, 242, second electrode, 25, first insulating piece, 261, first adapter, 262, second adapter, 27, second insulating piece, 28, pressure release mechanism.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions.

In describing embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

In the description of embodiments of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order, or a primary or secondary relationship. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.

In the description of the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B, and may indicate that a exists alone, while a and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In describing embodiments of the present application, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise indicated and limited. For example, they may be fixedly connected, detachably connected or integrally formed, mechanically connected, electrically connected, directly connected or indirectly connected through an intermediate medium, and communicated between two elements or the interaction relationship between two elements unless clearly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It is noted that an element is referred to as being "fixed" or "disposed" on another element, and may be directly on the other element or intervening elements may also be present. One element is considered to be "connected" to another element, which may be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the examples of the present application for illustrative purposes only and are not meant to be the only embodiments.

The more widely the battery is used in view of the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. The safety performance of the battery as an energy storage device is extremely important.

In misuse scenarios such as safety testing, overcharging, overdischarging, etc., and full life cycle use, there is often severe gassing when thermal runaway of the battery occurs. When the battery rapidly generates gas, the internal pressure of the battery is increased, and safety problems such as ignition and explosion of the battery are easily caused.

In the related art, a current cutoff structure (CID) is provided on a battery in order to improve the safety of the battery. The current cutting structure can be destroyed when the internal pressure of the battery exceeds the reference pressure, and the electric connection in the use or charging process of the battery is disconnected, so that the main circuit of the battery is cut off before the battery is in thermal runaway, the automatic power-off is performed, the battery is prevented from being used or charged continuously, and the safety of the battery is protected. For example, a battery top cover may be provided with a turnover piece and a current cutting structure, the turnover piece is fixed below the top cover through an insulating member, and the turnover piece is electrically connected with the top cover through the current cutting structure. The overturning piece can overturn and break the current cutting structure when the internal pressure of the battery exceeds the reference pressure, so that the overturning piece is disconnected with the top cover.

However, the residual electric quantity exists in the battery core of the battery, and the internal pressure can be released due to thermal runaway of the battery core, so that spontaneous combustion explosion is easy to cause. Therefore, it is necessary to reduce the charge of the battery cell when the battery rapidly generates gas, thereby reducing the risk of the battery from igniting and exploding.

Based on the above consideration, in order to reduce the charge of the battery cell when the battery rapidly generates gas, a power storage loop structure can be introduced into the battery to store and consume the residual power of the battery cell, so that the function of reducing the charge of the battery cell when the battery rapidly generates gas is realized, and the risk of fire and explosion of the battery is reduced.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. The power supply system with the battery monomer, the battery and the like forming the power utilization device can be used, so that the power supply system is beneficial to reducing the charge quantity of the battery core when the battery rapidly generates gas, reducing the risk of the battery for igniting and exploding and improving the safety.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to some embodiments of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 together define a containing space, the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the battery cells 20 are the smallest units constituting the battery 100, and the battery cells 20 may be plural, and the plural battery cells 20 may be connected in series or in parallel, and the series-parallel refers to both of the plural battery cells 20 being connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series or parallel or in parallel-series connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10, however, the battery 100 can also be in a form of a battery module formed by connecting the plurality of battery cells 20 in series or parallel or in parallel-series connection, and then the plurality of battery modules are connected in series or parallel or in parallel-series connection to form a whole and are accommodated in the box 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Each of the battery cells 20 may be a secondary battery or a primary battery, and may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, that is, the battery cell 20 is not limited to a square battery, but may be a cylindrical battery, or the like.

Referring to fig. 3 to 5, fig. 3 is an exploded view of a battery cell 20 according to some embodiments of the present application, fig. 4 is a cross-sectional view of the battery cell 20 according to some embodiments of the present application, and fig. 5 is a schematic structural diagram of a circuit assembly 22 according to some embodiments of the present application. The present application provides a battery cell 20. The battery cell 20 includes a cell 21 and a circuit assembly 22. The circuit component 22 is electrically connected with the battery core 21 to form an energy storage loop. The circuit assembly 22 includes an energy storage element 221 and a circuit switch 222, the circuit switch 222 being connected in series with the energy storage element 221. In case the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold, the circuit switch 222 is in a closed state to put the energy storage circuit in a conductive state, and the energy storage element 221 is configured to store electric energy when the energy storage circuit is conductive. In the case where the air pressure inside the battery cell 20 is less than the first air pressure threshold, the circuit switch 222 is in an open state, so that the energy storage circuit is in an open state.

The cell 21 is a member in which electrochemical reactions occur in the battery cell 20. The battery cell 20 may contain one or more electrical cells 21 inside. When the battery cell 20 is used or charged, the battery cell 21 is connected in series in the power utilization circuit or the charging circuit to form a power utilization or charging circuit. The charge amount of the battery cell 21 can be expressed by a state of charge (SOC) of the battery cell 21. The state of charge refers to the ratio of the remaining charge of the cell 21 to the capacity of the fully charged state of the cell 21, and can be expressed as a percentage. For example, soc=1 indicates that the battery cell 21 is in a full state. The state of charge may represent the ability of the cell 21 to continue to operate.

In the misuse scenes such as safety test, overcharge and overdischarge or the whole life cycle use process, when the battery cell 21 is out of control, the battery cell 21 can generate gas rapidly, so that the air pressure in the battery cell 20 is increased rapidly, and the safety problem of fire and explosion of the battery cell 20 can be caused. It can be appreciated that the charge of the battery cell 21 is reduced, so that the thermal stability of the battery cell 21 is improved, the risk of ignition and explosion of the battery cell 20 is reduced, and the safety of the battery cell 20 is improved.

The energy storage element 221 is capable of storing electric energy so that the circuit assembly 22 has an electric storage function. For example, the energy storage element 221 may include, but is not limited to, a capacitor or an inductor. The circuit assembly 22 may be structurally disposed on components capable of electrical connection within the battery cell 20, for example, components capable of electrical connection within the battery cell 20 may include, but are not limited to, tabs, electrode posts, tabs, etc. of the battery cell 21. The battery core 21 is electrically connected with the circuit component 22, and the circuit component 22 and the battery core 21 can form an energy storage loop with an electricity storage function.

The circuit switch 222 is used for controlling the on-off of the circuit assembly 22, and further controlling the on-off state of the energy storage circuit. The circuit switch 222 is configured to be able to operate in response to a change in the air pressure inside the battery cell 20 such that the circuit switch 222 is in a closed state or an open state. Wherein, the triggering condition of the circuit switch 222 may be set to be that the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold.

The first air pressure threshold value may be an air pressure comparison value set in advance for determining the air pressure inside the battery cell 20. For example, the first air pressure threshold may be in the range of 0.6MPa-1.2 MPa. If the air pressure inside the battery cell 20 is smaller than the first air pressure threshold, it indicates that the air pressure inside the battery cell 20 is smaller, the battery cell 21 is more stable, and the triggering condition of the circuit switch 222 is not reached. At this time, the circuit switch 222 is in an open state, so that the circuit assembly 22 is in an open state, and the energy storage circuit is in an open state, so that current does not pass through the circuit assembly 22. In this way, the influence of the energy storage circuit on the battery cell 21 can be reduced.

If the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold, it indicates that the air pressure inside the battery cell 20 is too high, and the trigger condition of the circuit switch 222 has been reached, the battery cell 21 may generate rapid air production, and there is a safety risk. At this time, the circuit switch 222 performs a closing operation, so that the circuit switch 222 is in a closed state, the circuit component 22 is turned on, and the energy storage circuit is turned on, so that the electricity storage function of the energy storage circuit can be exerted, the current can pass through the circuit component 22, the battery cell 21 can be discharged, and the electricity consumption of the battery cell 21 or the surplus electricity of the external charging current can be stored through the energy storage element 221. In this way, the charge of the battery cell 21 can be reduced, and the risk of ignition and explosion of the battery cell 20 can be reduced.

In some embodiments, the circuit switch 222 may be a pressure switch, the circuit switch 222 senses the air pressure change inside the battery cell 20, and when the air pressure inside the battery cell 20 reaches the triggering condition of the circuit switch 222, the circuit switch 222 performs a closing action, so that the circuit switch 222 is in a closed state. In other embodiments, the circuit switch 222 may be a controlled switch, and the circuit switch 222 performs a closing operation after receiving the control signal, so that the circuit switch 222 is in a closed state.

According to the battery cell 20 of the embodiment of the application, the circuit assembly 22 is connected with the battery cell 21 in a conductive manner, and the circuit switch 222 is arranged to respond to the air pressure change in the battery cell 20, so that the circuit assembly 22 can be conducted when the air pressure in the battery cell 20 rises to reach the first air pressure threshold value, the circuit assembly 22 and the battery cell 21 form a conducted energy storage loop, the battery cell 21 can be discharged, and the storage and consumption of the residual electric quantity of the battery cell 21 are realized. In this way, the charge of the battery cell 21 can be reduced when the battery cell 21 rapidly generates gas, so that the risk of the explosion of the battery cell 20 caused by fire is reduced, and the safety performance of the battery cell 20 can be improved.

In some embodiments, referring to fig. 4 and 5, the circuit switch 222 includes a gas bladder 2221, the gas bladder 2221 is filled with gas, and the gas bladder 2221 is configured to deform in response to a change in the gas pressure inside the battery cell 20 to turn on or off the energy storage circuit. The air pressure within the air bladder 2221 is less than the first air pressure threshold.

The balloon 2221 contains a gas at a pressure that may include, but is not limited to, air or other gas. The air bag 2221 is provided inside the battery cell 20 such that the air bag 2221 can be deformed in response to a change in the air pressure inside the battery cell 20. The air pressure inside the air bag 2221 is a set air pressure value, and the set air pressure value is smaller than the first air pressure threshold, for example, the first air pressure threshold may be 1.0MPa, and the set air pressure value is smaller than 1.0MPa.

When the air pressure inside the battery cell 20 is normal, i.e., the air pressure inside the battery cell 20 is lower than a certain value, for example, the air pressure inside the battery cell 20 is lower than the air pressure inside the air bag 2221, the air bag 2221 is in an uncompressed state. At this time, the airbag 2221 is not compressed, the circuit switch 222 is not operated, and the circuit switch 222 is in the open state, so that the circuit assembly 22 is in the open state.

When the air pressure in the battery cell 20 is higher than a certain value, for example, the air pressure in the battery cell 20 is higher than the air pressure in the air bag 2221, the air bag 2221 is compressed under the action of the internal and external pressure difference to generate compression deformation, the air bag 2221 is in a compressed state, when the air pressure in the battery cell 20 rises to reach a first air pressure threshold, that is, the air pressure in the battery cell 20 is greater than or equal to the first air pressure threshold, the compression deformation generated by the air bag 2221 enables the circuit switch 222 to be closed, the circuit assembly 22 is in a conducting state, and electric current can pass through the circuit assembly 22 to realize electric quantity storage.

By setting the circuit switch 222 to include the air bag 2221, and the air pressure in the air bag 2221 is smaller than the first air pressure threshold, the circuit switch 222 can sense the air pressure change in the battery cell 20 through the air bag 2221, so as to control the switch state of the circuit switch 222 in response to the air pressure change in the battery cell 20. Thus, the structure of the circuit switch 222 can be simplified, the reliability of the circuit switch 222 can be improved, and the cost can be reduced.

In some embodiments, referring to fig. 5, the circuit assembly 22 further includes a wire 223, a first electrical connector 224, and a second electrical connector 225, the first electrical connector 224, the energy storage element 221, the circuit switch 222, and the second electrical connector 225 being connected in series by the wire 223, thereby forming the circuit assembly 22. The first electrical connector 224 and the second electrical connector 225 are electrically connected to the battery cell 20 to electrically connect the circuit assembly 22 to the battery cell 20.

For example, the first electrical connector 224 may be a positive electrode of the circuit assembly 22 and the first electrical connector 224 may include, but is not limited to, an aluminum sheet. The second electrical connector 225 may be a negative electrode of the circuit assembly 22 and the second electrical connector 225 may include, but is not limited to, a copper sheet. Aluminum sheets and copper sheets are used as circuit terminals for the circuit assembly 22. The conductive line 223 may be any electrically conductive material, for example, the conductive line 223 may include, but is not limited to, copper wire. The shape of the wire 223 may include, but is not limited to, a wire or sheet.

Thus, the circuit assembly 22 has a simple and compact structure, can save occupied space, and is beneficial to reducing cost.

In some embodiments, referring to fig. 5, and further referring to fig. 6 and fig. 7, fig. 6 is a schematic structural diagram of an open state of a circuit switch 222 according to some embodiments of the present application, and fig. 7 is a schematic structural diagram of a closed state of the circuit switch 222 according to some embodiments of the present application, where the circuit switch 222 further includes a conductive element 2222 and a switch element 2223. One end of the conductive member 2222 is located inside the airbag 2221, and the other end is located outside the airbag 2221, and the conductive member 2222 is used to connect the circuit switch 222 in series in the circuit assembly 22. The switch 2223 is disposed within the air cell 2221, and compression of the air cell 2221 can drive the switch 2223 to move closer to the conductive element 2222. In the case that the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold, the switch member 2223 moves into conductive contact with the conductive member 2222, so that the circuit switch 222 is closed. In the case that the air pressure inside the battery cell 20 is less than the first air pressure threshold, the switch 2223 is separated from the conductive member 2222, so that the circuit switch 222 is opened.

The conductive element 2222 and the switch element 2223 may be any electrically conductive material, for example, the material of the conductive element 2222 and the switch element 2223 may include, but is not limited to, copper. The shapes of the conductive member 2222 and the switching element 2223 may include, but are not limited to, a wire shape or a sheet shape.

One end of the conductive member 2222 is located outside the airbag 2221, and the other end of the conductive member 2222 is inserted into the inside of the airbag 2221. One end of the conductive member 2222 located outside the airbag 2221 is connected to the lead 223, thereby connecting the circuit switch 222 in series in the circuit assembly 22. In some embodiments, the number of the conductive elements 2222 may be two, and the two conductive elements 2222 are disposed at intervals between one ends of the air bag 2221. For example, the conductive member 2222 may be a conductive wire that is threaded through the airbag 2221. The switch member 2223 may be provided on the inner wall of the airbag 2221, or may be movably provided in the middle of the airbag 2221, and is not particularly limited herein. For example, the switch 2223 may be a conductive sheet attached to the inner wall of the airbag 2221.

The air bag 2221 can generate compression deformation under the action of pressure, and the air bag 2221 can drive the switch element 2223 to move when generating compression deformation, so that the switch element 2223 can move close to or far away from the conductive element 2222, and the switch element 2223 can act under the action of pressure.

When the airbag 2221 is in the uncompressed state, the switching element 2223 is separated from the at least one conductive element 2222, the circuit switch 222 is opened, and the circuit assembly 22 is in the open state. The air bag 2221 may be compressively deformed to bring the switch element 2223 into abutment with the conductive element 2222, and when the switch element 2223 is moved into conductive contact with the conductive element 2222, the circuit switch 222 is closed, and the circuit assembly 22 is in a conductive state.

Through setting up electrically conductive piece 2222 and switch piece 2223 and connecting on gasbag 2221, form gasbag 2221 switch structure, gasbag 2221 can warp and drive the switch piece 2223 motion, makes the switch piece 2223 can act under the pressure to move to be connected or separate with electrically conductive piece 2222, realize the on-off state of control circuit switch 222. Thus, the structure of the circuit switch 222 can be simplified, the reliability of the circuit switch 222 can be improved, and the cost can be reduced.

In some embodiments, referring to fig. 3 and 4, the battery cell 20 further includes a pressure relief mechanism 28, the pressure relief mechanism 28 configured to relieve the pressure inside the battery cell 20 when the air pressure inside the battery cell 20 reaches a second air pressure threshold. The second air pressure threshold is greater than or equal to the first air pressure threshold.

To further enhance the safety of the battery cell 20, a pressure relief mechanism 28 may be provided on the battery cell 20. Pressure relief mechanism 28 may include, but is not limited to, an explosion-proof valve, a current shut-off structure, and the like. When the battery cell 21 generates severe gas, and the air pressure in the battery cell 20 rises rapidly, the pressure release mechanism 28 can be opened when the air pressure in the battery cell 20 reaches the second air pressure threshold, and the air in the battery cell 20 is released through the pressure release mechanism 28, so that the air pressure in the battery cell 20 is reduced, and the risk of ignition and explosion of the battery cell 20 can be reduced. The second air pressure threshold is a preset opening pressure value for opening the pressure release mechanism 28 by the battery unit 20. For example, the second air pressure threshold may be in the range of 0.6MPa-1.2 MPa.

Due to the provision of the pressure relief mechanism 28, during severe gas production inside the battery cell 20, the gas pressure inside the battery cell 20 may undergo a rise (before the pressure relief mechanism 28 is opened) and a dip (when the pressure relief mechanism 28 is opened). Since the second air pressure threshold is greater than or equal to the first air pressure threshold, the trigger air pressure value for triggering the circuit switch 222 to perform the closing action is less than or equal to the opening pressure value for opening the pressure release mechanism 28. In the process of increasing the internal air pressure of the battery cell 20 before the pressure release mechanism 28 is opened, when the internal air pressure of the battery cell 20 reaches the first air pressure threshold value, the trigger circuit switch 222 performs a closing action to conduct the circuit assembly 22, so as to conduct the energy storage loop, so that the circuit assembly 22 can exert the electricity storage function and realize the storage and consumption of the electric quantity of the electric core 21.

By setting the second air pressure threshold value to be greater than or equal to the first air pressure threshold value, the trigger air pressure value for conducting the energy storage loop is smaller than or equal to the opening pressure value for opening the pressure release mechanism 28, the energy storage loop can be conducted before the pressure release mechanism 28 is opened in the process of rising the air pressure in the battery unit 20, the effectiveness of the energy storage loop can be improved, the energy storage loop can exert the electricity storage function, the storage and consumption of the electric quantity of the electric core 21 are realized, the charged electric quantity of the electric core 21 can be reduced, the risk of the ignition explosion of the battery unit 20 is reduced, and the safety performance is improved.

In some embodiments, referring to fig. 3 and 4, and further referring to fig. 8, fig. 8 is a top view of an end cap 24 provided in some embodiments of the present application, the battery cell 20 further includes a housing 23 and an end cap 24, the end cap 24 covers an opening 231 of the housing 23, the housing 23 and the end cap 24 enclose a receiving space, and the battery cell 21 is received in the receiving space. The circuit assembly 22 is disposed in the accommodating space and located between the end cap 24 and the battery cell 21.

The end cap 24 is sealingly mounted to the housing 23 at the opening 231, and the battery cell 21 and the circuit assembly 22 are enclosed within the housing 23. The end cap 24 refers to a member that is covered at the opening 231 of the case 23 to isolate the inner environment of the battery cell 20 from the outer environment. Without limitation, the shape of the end cap 24 may be adapted to the shape of the housing 23 to fit the housing 23. Alternatively, the end cover 24 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cover 24 is not easy to deform when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the safety performance can be improved. The end cap 24 may be provided with functional components such as a first electrode 241 and a second electrode 242. The first electrode 241 and the second electrode 242 may be used to electrically connect with the battery cell 21 for outputting or inputting electric power of the battery cell 20. In some embodiments, the end cap 24 may also be provided with a pressure relief mechanism 28 for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold. The material of the end cap 24 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application is not limited thereto.

The housing 23 is an assembly for mating with the end cap 24 to form the internal environment of the battery cell 20, where the internal environment may be formed to house the cell 21, the circuit assembly 22, electrolyte, and other functional components. The case 23 and the end cap 24 may be separate components, and an opening 231 may be provided in the case 23, and the interior of the battery cell 20 may be formed by covering the opening 231 with the end cap 24 at the opening 231. It is also possible to integrate the end cap 24 and the housing 23, but specifically, the end cap 24 and the housing 23 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 23, the end cap 24 is then put into place on the housing 23. The housing 23 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 23 may be determined according to the specific shape and size of the battery cell 21. The material of the housing 23 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

By arranging the circuit assembly 22 between the end cover 24 and the battery cell 21, a larger installation space can be provided for the circuit assembly 22, and the energy storage element 221 with a larger size can be used, so that the energy storage capacity is larger, the electric quantity of the battery cell 21 can be stored and consumed more, and the effect of reducing the electric quantity of the battery cell 21 is better.

In some embodiments, referring to fig. 3 and 4, and further referring to fig. 9 to 11, fig. 9 is a cross-sectional view of section A-A in fig. 8, fig. 10 is a bottom view of an end cap 24 provided in some embodiments of the present application, fig. 11 is a schematic view of a circuit assembly 22 provided in some embodiments of the present application disposed on a first insulating member 25, and the battery cell 20 further includes the first insulating member 25, where the first insulating member 25 is stacked on the inner side of the end cap 24. The circuit assembly 22 is disposed on the first insulator 25.

The first insulating member 25 may be further disposed on the inner side of the end cap 24, and the first insulating member 25 may be used to isolate the electrical connection member in the case 23 from the end cap 24, thereby playing an insulating role, reducing the risk of short circuit, and improving the safety performance of the battery cell 20. The first insulating member 25 is an insulating material member. By way of example, the insulating material may be plastic, rubber, or the like. For example, the first insulating member 25 may be a plastic plate.

The circuit assembly 22 may be disposed on the first insulating member 25 to form an assembly of the circuit assembly 22 and the first insulating member 25. Illustratively, the first insulating member 25 has a certain thickness, and each component of the circuit assembly 22 may be embedded in the first insulating member 25 having a certain thickness to form an integral structure, and the circuit assembly 22 as a part of the first insulating member 25 constitutes the first insulating member 25 of the circuit with the electricity storage function.

When the battery cell 20 is assembled, the first insulating member 25 is installed between the inner side of the end cover 24 and the battery cell 21, and the first electrical connector 224 and the second electrical connector 225 of the circuit assembly 22 are electrically connected with the first tab 212 and the second tab 213 of the battery cell 21, respectively, thereby connecting the circuit assembly 22 in the circuit structure of the battery cell 20, and the circuit assembly 22 and the battery cell 21 form an energy storage loop.

By disposing the circuit assembly 22 on the first insulating member 25, a mounting base for the circuit assembly 22 can be provided, the circuit assembly 22 can be easily assembled in the battery cell 20, and the assembly efficiency can be improved.

In some embodiments, referring to fig. 3, and further referring to fig. 12 to 14, fig. 12 is a schematic diagram of a circuit assembly 22 provided in some embodiments of the present application connected in series between a first adaptor 261 and a second adaptor 262, fig. 13 is a schematic diagram of a circuit assembly 22 provided in other embodiments of the present application connected in series between a first adaptor 261 and a second adaptor 262, and fig. 14 is a schematic diagram of a circuit assembly 22 provided in still other embodiments of the present application connected in series between a first adaptor 261 and a second adaptor 262. The battery cell 21 includes a battery cell body 211, and a first tab 212 and a second tab 213 connected to the battery cell body 211. The battery cell 20 further includes a first electrode 241, a second electrode 242, a first adapter 261, and a second adapter 262, the first adapter 261 is connected between the first electrode 241 and the first tab 212, the second adapter 262 is connected between the second electrode 242 and the second tab 213, and the first electrode 241 and the second electrode 242 are used for outputting or inputting electric energy of the battery cell 20. The circuit assembly 22 is connected in series between the first adapter 261 and the second adapter 262.

The battery cell 21 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the cell body 211 of the cell 21, and the portions of the positive electrode sheet and the negative electrode sheet having no active materials constitute the first tab 212 and the second tab 213, respectively, the first tab 212 and the second tab 213 being the positive electrode tab and the negative electrode tab, respectively. The first tab 212 and the second tab 213 may be located at one end of the battery cell body 211 or located at two ends of the battery cell body 211 respectively. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer forms a positive electrode lug. Taking a lithium ion battery as an example, the positive electrode current collector may be aluminum foil, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. And stirring and mixing the positive electrode active substances and the like to obtain positive electrode slurry, coating the positive electrode slurry on the surface of a positive electrode current collector, baking and drying, and performing cold pressing (rolling), pre-cutting, slitting and other procedures to prepare the positive electrode plate. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer forms a negative electrode tab. The negative electrode current collector may be copper foil, and the negative electrode active material may be carbon, silicon, or the like. And stirring and mixing the anode active substances and the like to obtain anode slurry, coating the anode slurry on the surface of an anode current collector, baking and drying, and performing cold pressing, pre-cutting, slitting and other procedures to obtain the anode sheet. The separator may be at least one of a glass cloth, a non-woven fabric, a Polypropylene (PP) film and a Polyethylene (PE) film, and may be a single-layer film or a multi-layer composite film, without limitation.

The first electrode 241 and the second electrode 242 may be used to output or input electric power of the battery cell 20. The first electrode 241 and the second electrode 242 may be provided on the end cover 24, the first electrode 241 and the second electrode 242 may be provided on the case 23, or one of the first electrode 241 and the second electrode 242 may be provided on the end cover 24, and the other may be provided on the case 23. The first electrode 241 and the second electrode 242 are made of conductive materials to realize input and output of electric energy. The material of the first electrode 241 and the second electrode 242 may be, but not limited to, copper, aluminum, or the like. The shapes of the first electrode 241 and the second electrode 242 may be, but not limited to, a cylinder, a prism, etc. During charge and discharge of the battery cell 20, the positive electrode active material and the negative electrode active material react with the electrolyte, the first tab 212 is connected to the first electrode 241 through the first adaptor 261, and the second tab 213 is connected to the second electrode 242 through the second adaptor 262 to form a current loop.

As shown in fig. 12, when the battery cell 20 is assembled, the first electrical connector 224 may be connected between the first electrode 241 and the first adapter 261, and the second electrical connector 225 may be connected between the second electrode 242 and the second adapter 262. Illustratively, the first electrical connector 224 may be an aluminum sheet, the first electrode 241 may be a positive electrode post, the first adapter 261 may be a positive electrode adapter, and the aluminum sheet is located between the positive electrode post and the positive electrode adapter, and the aluminum sheet, the positive electrode post, and the positive electrode adapter are connected by laser welding. The second electrical connector 225 may be a copper sheet, the second electrode 242 may be a negative electrode post, the second adapter 262 may be a negative electrode adapter piece, the copper sheet is located between the negative electrode post and the negative electrode adapter piece, and the copper sheet, the negative electrode post and the negative electrode adapter piece are connected by laser welding.

As shown in fig. 13 and 14, when the battery cell 20 is assembled, the first electrical connector 224 may be connected to the first adapter 261 and the second electrical connector 225 may be connected to the second adapter 262 to connect the circuit assembly 22 between the first adapter 261 and the second adapter 262. The first adaptor 261 is connected to the first electrode 241, and the second adaptor 262 is connected to the second electrode 242.

Thus, the circuit assembly 22 is connected in the circuit structure of the battery cell 20 by the first and second switches 261 and 262, and the circuit assembly 22 and the battery cell 21 form an energy storage circuit.

Through establishing ties circuit subassembly 22 between first adaptor 261 and second adaptor 262, can provide the bigger installation space of circuit subassembly 22, can use the energy storage component 221 of bigger size, make the storage capacity bigger, can store more and consume the electric quantity of electric core 21, reduce the effect of electric core 21 lotus electric quantity better, and the mounting structure of circuit subassembly 22 is simple moreover, is favorable to the reduce cost.

In some embodiments, referring to fig. 15, fig. 15 is a schematic diagram of a circuit assembly 22 provided in some embodiments of the present application connected in series between a first tab 212 and a second tab 213, and a battery cell 21 includes a battery cell body 211 and the first tab 212 and the second tab 213 connected to the battery cell body 211. The circuit assembly 22 is connected in series between the first tab 212 and the second tab 213.

When the battery cell 20 is assembled, the first electrical connector 224 may be connected to the first tab 212, and the second electrical connector 225 may be connected to the second tab 213, so as to connect the circuit assembly 22 between the first tab 212 and the second tab 213 of the battery cell 21. Illustratively, the first electrical connector 224 may be an aluminum sheet and the second electrical connector 225 may be a copper sheet, and the circuit assembly 22 may be soldered to the first tab 212 and the second tab 213 via the aluminum sheet and the copper sheet, respectively. The first tab 212 is connected to the first electrode 241 through the first adapter 261, and the second tab 213 is connected to the second electrode 242 through the second adapter 262. Thereby connecting the circuit assembly 22 in the circuit structure of the battery cell 20, the circuit assembly 22 and the battery cell 21 form an energy storage circuit.

Through establishing ties circuit subassembly 22 between first utmost point ear 212 and second utmost point ear 213, can provide the bigger installation space of circuit subassembly 22, can use the energy storage component 221 of bigger size, make the storage capacity bigger, can store more and consume the electric quantity of electric core 21, reduce the effect of electric core 21 lotus electric quantity better, and the mounting structure of circuit subassembly 22 is simple in addition, is favorable to the reduce cost.

In some embodiments, referring to fig. 3, the battery cell 20 may further include a second insulating member 27, where the second insulating member 27 may wrap the battery cell 21, and may space the housing 23 and the battery cell 21, so as to implement insulation protection for the battery cell 21. The second insulating member 27 may include an insulating film folded to form a box body having a top opening substantially the same as the shape of the case 23, but a small size, for example, the case 23 has a rectangular parallelepiped shape, and the second insulating member 27 is folded to form a rectangular box body having a top opening corresponding to the size of the cell 21, and the cell 21 is first mounted in the second insulating member 27 in a folded state and then mounted in the case 23 together with the second insulating member 27, so that the second insulating member 27 separates the cell 21 from the case 23. The second insulating member 27 may be made of PP (polypropylene) or PET (polyethylene terephthalate ) such as Mylar (Mylar), a tough polymer with good heat resistance, excellent electrical insulation, and good electrical properties even at high temperature and high frequency.

According to some embodiments of the present application, referring to fig. 2, the present application provides a battery 100. The battery 100 includes the battery cells 20 provided by the above embodiments.

Since the battery 100 has the same technical effects as the above-described battery cells 20, a detailed description thereof will be omitted.

According to some embodiments of the present application, the present application further provides an electric device, where the electric device includes the battery 100 or the battery cell 20 provided in the above embodiments, and the battery 100 and the battery cell 20 are used to provide electric energy for the electric device.

The powered device may be any of the devices or systems described above that employ battery 100. Since the power consumption device has the same technical effects as those of the battery 100 and the battery cell 20, the description thereof is omitted.

It should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit the technical solution of the present application, and although the detailed description of the present application is given with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application, and all the modifications or substitutions are included in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A battery cell, comprising:

The circuit assembly comprises an energy storage element and a circuit switch, wherein the circuit switch is connected with the energy storage element in series;

When the air pressure in the battery cell is smaller than a first air pressure threshold value, the circuit switch is in an off state so that the energy storage loop is in an off state; when the air pressure in the battery cell is greater than or equal to the first air pressure threshold value, the circuit switch is in a closed state so as to enable the energy storage loop to be in a conducting state;

the circuit switch comprises an air bag, wherein air is filled in the air bag, the air pressure in the air bag is smaller than the first air pressure threshold value, and the air bag is configured to deform in response to air pressure change in the battery cell so as to conduct or cut off the energy storage loop;

the battery cell also comprises a shell and an end cover, wherein the end cover is covered at the opening of the shell, the shell and the end cover enclose a containing space, the battery cell is contained in the containing space, and the circuit component is arranged in the containing space and is positioned between the end cover and the battery cell.

2. The battery cell as defined in claim 1, wherein the circuit switch further comprises a conductive member and a switch member, wherein one end of the conductive member is positioned in the air bag, the other end of the conductive member is positioned outside the air bag, the conductive member is used for connecting the circuit switch in series in the circuit assembly, the switch member is positioned in the air bag, and the air bag compression deformation can drive the switch member to move close to the conductive member;

Under the condition that the air pressure in the battery cell is greater than or equal to the first air pressure threshold value, the switch piece moves to be in conductive contact with the conductive piece, so that the circuit switch is closed; and under the condition that the air pressure in the battery cell is smaller than the first air pressure threshold value, the switch piece is separated from the conductive piece, so that the circuit switch is disconnected.

3. The battery cell of claim 1, wherein the circuit assembly further comprises a wire, a first electrical connector and a second electrical connector, the first electrical connector, the energy storage element, the circuit switch and the second electrical connector being connected in series by the wire, the first electrical connector and the second electrical connector being electrically connected to the electrical cell.

4. The battery cell of claim 1, further comprising a pressure relief mechanism for relieving pressure inside the battery cell when the air pressure inside the battery cell reaches a second air pressure threshold;

The second air pressure threshold is greater than or equal to the first air pressure threshold.

5. The battery cell of claim 4, wherein the pressure relief mechanism comprises an explosion-proof valve.

6. The battery cell of any one of claims 1 to 4, further comprising a first insulator disposed in a stack inside the end cap;

The circuit assembly is disposed on the first insulating member.

7. The battery cell of any one of claims 1 to 4, wherein the battery cell comprises a cell body and first and second tabs connected to the cell body, the battery cell further comprising a first electrode, a second electrode, a first adapter, and a second adapter, the first adapter connected between the first electrode and the first tab, the second adapter connected between the second electrode and the second tab, the first electrode and the second electrode for outputting or inputting electrical energy of the battery cell;

the circuit assembly is connected in series between the first adapter and the second adapter.

8. The battery cell of any one of claims 1 to 4, wherein the cell comprises a cell body and first and second tabs connected to the cell body;

The circuit component is connected in series between the first tab and the second tab.

9. A battery comprising the battery cell of any one of claims 1 to 8.

10. An electrical device comprising a battery according to claim 9 or a battery cell according to any one of claims 1 to 8, the battery and the battery cell being adapted to provide electrical energy.