CN222802054U - Lithium battery - Google Patents

Abstract

The utility model discloses a lithium battery which comprises a shell, a winding core, a circuit board, a protective cover and an anode body, wherein the circuit board is provided with an element side and a polarity side which are oppositely arranged, the shell is provided with a containing groove, the winding core is arranged in the containing groove, the circuit board is arranged at a notch of the containing groove, the element side faces the winding core, the protective cover is arranged at the element side, and the anode body is arranged at the polarity side. The electronic components concentrate on the component side of circuit board, the component side is towards the roll core, the protection cover protects the component side, prevents electrolyte from penetrating and damaging the electronic components, the positive electrode end of the roll core is connected with the circuit board through the protection cover and is led out by the positive electrode body as the positive electrode, the shell is connected with the negative electrode end of the roll core as the negative electrode, the component side of the circuit board is inwards arranged, the space in the accommodating groove can be fully utilized, the problem that the traditional electronic components are outwards large in size is solved, and the reduction of the size of the lithium battery is favorable for meeting the requirement of current products.

Description

Lithium battery

Technical Field

The utility model relates to the technical field of energy storage products, in particular to a lithium battery.

Background

Lithium batteries are used in a variety of fields because of their numerous advantages. Based on normal use of the lithium battery and protection during charging and discharging of the lithium battery, the lithium battery is required to be externally connected with a corresponding circuit protection board for conventional use, and the circuit protection board can monitor parameters such as voltage, current, temperature and the like of the lithium battery, so that charging and discharging protection is realized, and battery failure conditions such as overcharge, overdischarge and short circuit are prevented.

After the conventional lithium battery is combined with a circuit protection board, the problem of volume increase exists, and when a lot of products are further pursued to be miniaturized, the requirement of the current products is difficult to be met by the oversized lithium battery, and the use scene is gradually limited.

Disclosure of utility model

Aiming at the defects of the prior art, the utility model provides a lithium battery.

The utility model discloses a lithium battery, which comprises a shell, a winding core, a circuit board, a protective cover and an anode body, wherein the circuit board is provided with an element side and a polarity side which are oppositely arranged;

The negative end of the winding core is electrically connected with the polar side through the shell, and the positive end of the winding core is electrically connected with the positive body through the protective cover.

According to an embodiment of the utility model, the polar side is provided with a negative electrode body, and the housing is electrically connected with the negative electrode body.

According to an embodiment of the present utility model, the first sealing body is disposed between the protection cover and the wall surface of the accommodating groove.

According to an embodiment of the utility model, the first sealing body is made of plastic or silicone.

According to an embodiment of the present utility model, the protection device further includes a protection body disposed between the protection cover and the element side.

According to one embodiment of the utility model, the anti-explosion device further comprises an anti-explosion body, the protection cover is provided with an exhaust hole, and the anti-explosion body is respectively connected with the wall surface of the exhaust hole and the positive electrode end of the winding core.

According to an embodiment of the utility model, the gas-tight seal further comprises a second sealing body, wherein the second sealing body is positioned between the explosion-proof body and the protective cover, and one end of the explosion-proof body penetrates through the second sealing body and is connected with the wall surface of the gas exhaust hole.

According to an embodiment of the present utility model, the protective body is a PTC thermistor.

According to one embodiment of the utility model, the explosion proof body is a CID explosion proof valve.

According to one embodiment of the present utility model, the housing is inwardly recessed.

The lithium battery has the advantages that the electronic components are concentrated on the component side of the circuit board, the component side faces the winding core, the protection cover protects the component side, electrolyte is prevented from penetrating into the electronic components to damage the electronic components, the positive end of the winding core is connected with the circuit board through the protection cover and is led out by the positive body as the positive electrode, the shell is connected with the negative end of the winding core as the negative electrode, the component side of the circuit board is arranged inwards, the space in the accommodating groove can be fully utilized, the problem that the traditional electronic components are large in size due to outwards facing is solved, and the size of the lithium battery is reduced, so that the requirement of a current product is met.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a schematic perspective view of a lithium battery;

FIG. 2 is a schematic cross-sectional view of a lithium battery;

fig. 3 is a partial enlarged view of fig. 2.

Description of the reference numerals

101. The shell, 1011, the containing groove, 1012, the groove;

102. A winding core;

103. Circuit board 1031, element side 1032, polarity side 1033, negative electrode body;

104. 1041, exhaust holes;

105. A positive electrode body;

106. A first sealing body;

107. a protective body;

108. an explosion-proof body;

109. And a second sealing body.

Detailed Description

Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the utility model solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

As shown in fig. 1 to 3, fig. 1 is a schematic perspective view of a lithium battery, fig. 2 is a schematic cross-sectional view of a lithium battery, and fig. 3 is a partially enlarged view of fig. 2. The lithium battery comprises a shell 101, a winding core 102, a circuit board 103, a protection cover 104 and a positive electrode body 105, wherein the winding core 102 and electrolyte are arranged in the shell 101, the circuit board 103 and the protection cover 104 are also arranged in the shell 101, the protection cover 104 is connected with the circuit board 103 and the winding core 102, the circuit board 103 is protected by the protection cover 104, the electrolyte is prevented from penetrating into and contacting with electronic components on the circuit board 103, the circuit board 103 is connected with the winding core 102 by the protection cover 104, the positive electrode body 105 is positioned outside the shell 101, the positive electrode body 105 is connected with the circuit board 103, and the positive electrode body 105 is exposed to serve as a positive electrode of the whole lithium battery.

The housing 101 has a housing groove 1011, the housing groove 1011 is axially opened along the housing 101, the winding core 102, the circuit board 103 and the protective cover 104 are all located in the housing groove 1011, and electrolyte injected in a later stage is also located in the housing groove 1011. Further, the outer surface of the housing 101 is provided with the groove 1012 inwards, and due to the arrangement of the groove 1012, the corresponding inner wall of the accommodating groove 1011 forms an inward convex structure, which can play a role of fixing the winding core 102, and can also serve as a bearing point of the circuit board 103 and the protective cover 104, that is, the inward convex structure is axially divided into an upper side and a lower side, the lower side is close to the winding core 102, and the protective cover 104 is located at the upper side.

In particular, the circuit board 103 has an element side 1031 and a polarity side 1032, the element side 1031 and the polarity side 1032 are opposite, in this embodiment, the side of the circuit board 103 facing the winding core 102 is the element side 1031, the side of the circuit board 103 away from the winding core 102 is the polarity side 1032, in particular, the electronic components are integrated on the element side 1031, the protection cover 104 is disposed on the element side 1031, and the protection cover 104 covers the electronic components to realize protection of the electronic components, in addition, the element side 1031 of the circuit board 103 is integrated with a protection circuit, compared with the conventional method of connecting the protection circuit with a lithium battery after independent processing, the process can be simplified, and efficiency can be improved. The positive electrode body 105 is disposed on the polarity side 1032 as a positive electrode output terminal of the lithium battery. Further, the polar side 1032 is further provided with a negative electrode body 1033, the case 101 is connected to the negative electrode body 1033, specifically, the negative electrode body 1033 is disposed along the contour of the polar side 1032, and the notch of the accommodating groove 1011 on the case 101 contacts the negative electrode body 1033 through the fold-in.

It can be understood that the positive electrode end of the winding core 102 is a positive electrode ear, which is electrically connected to the positive electrode body 105 through the protective cover 104 and the circuit board 103, and the positive electrode body 105 can be used as the positive electrode output end of the lithium battery at this time, and the negative electrode end of the winding core 102 is a negative electrode ear, which is electrically connected to the circuit board 103 through the casing 101 and the negative electrode body 1033, that is, the casing 101 will be used as the negative electrode output end of the lithium battery, so that the positive electrode and the negative electrode of the lithium battery form a complete loop.

Preferably, the lithium battery further comprises a first sealing body 106, wherein the first sealing body 106 is arranged between the protective cover 104 and the inner wall surface of the accommodating groove 1011, and in specific application, the first sealing body 106 is positioned on the upper side of the groove 1012 of the shell 101, namely, the upper side of the groove 1012 is used as a support for the first sealing body 106, the protective cover 104 is arranged on the first sealing body 106, and the first sealing body 106 is used as a support, so that the lithium battery is sealed, electrolyte in the accommodating groove 1011 is prevented from flowing out, and the contact between the protective cover 104 and the circuit board 103 and the shell 101 is blocked, so that the insulating effect is achieved. Specifically, the first sealing body 106 is made of a soft insulating material, for example, plastic or silica gel.

Further, the lithium battery further comprises a protecting body 107, the protecting body 107 is arranged between the protecting cover 104 and the circuit board 103, the protecting body 107 is electrically connected with the protecting cover 104, and the protecting body 107 is electrically connected with the circuit board 103. Specifically, the protecting body 107 is a PTC thermistor, and by setting the protecting body 107, the protection of the lithium battery is achieved, for example, when the temperature is too high, the resistance of the protecting body 107 increases, and then the conduction between the protecting cover 104 and the circuit board 103 is blocked, that is, the output of the positive end of the winding core 102 is blocked, and when the temperature is reduced, the resistance of the protecting body 107 decreases, and the positive end of the winding core 102, the protecting cover 104, the circuit board 103 and the positive electrode body 105 can be kept in a conducting state.

Further, the lithium battery further includes an explosion-proof body 108, the explosion-proof body 108 is connected to the positive end of the winding core 102, meanwhile, the protection cover 104 is provided with an exhaust hole 1041, the inner space of the accommodating groove 1011 and the inner space of the protection cover 104 can be communicated through the exhaust hole 1041, and one side of the explosion-proof body 108 far away from the positive end of the winding core 102 is connected to the wall surface of the exhaust hole 1041. It is understood that, due to the connection between the explosion-proof body 108 and the vent 1041, the vent 1041 is blocked, and the electrolyte in the accommodating tank 1011 does not flow into the protective cover 104 through the vent 1041, and does not damage the circuit board 103. Specifically, the explosion-proof body 108 is a CID explosion-proof valve, when excessive gas exists in the accommodating groove 1011, the generated air pressure will force the explosion-proof body 108 to separate from the exhaust hole 1041, at this time, the inner space of the accommodating groove 1011 is communicated with the inner space of the protecting cover 104, and the gas can be discharged to the outside of the lithium battery through the exhaust hole 1041 and the hole on the circuit board 103, so as to realize the pressure relief treatment, thereby preventing the explosion condition caused by the excessive pressure in the lithium battery and improving the safety performance of the lithium battery.

Further, the lithium battery further includes a second sealing body 109, the second sealing body 109 is disposed between the explosion-proof body 108 and the protection cover 104, one side of the explosion-proof body 108 penetrates through the second sealing body 109 and is located in the exhaust hole 1041, and by means of the arrangement of the second sealing body 109, not only is the connection stability between the explosion-proof body 108 and the protection cover 104 enhanced, but also the sealing effect on the exhaust hole 1041 is achieved, and the electrolyte is prevented from flowing into the exhaust hole 1041. It will be appreciated that when the air pressure in the accommodation groove 1011 exceeds the limit value, the explosion-proof body 108 is not only separated from the air outlet 1041, but also partially or completely separated from the second sealing body 109, and the air is discharged through the gap formed by the separation of the explosion-proof body 108.

It should be noted that the "conductive connection" mentioned above is a connection manner in which current can be conducted, for example, a connection between metals, and current can be conducted.

In summary, the electronic components concentrate on the component side 1031 of the circuit board 103, the component side 1031 faces the winding core 102, the protection cover 104 protects the component side 1031, the electronic components are prevented from being damaged by the electrolyte, the positive end of the winding core 102 is connected with the circuit board 103 through the protection cover 104 and is led out by the positive body 105 as the positive electrode, the shell 101 is connected with the negative end of the winding core 102 as the negative electrode, the component side 1031 of the circuit board 103 is arranged inwards, the space in the accommodating groove 1011 can be fully utilized, the problem of large volume caused by outward facing of the traditional electronic components is solved, and the volume of the lithium battery is reduced, so that the requirement of the current product is met.

The foregoing description is only illustrative of the utility model and is not to be construed as limiting the utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.

Claims (10)

1. The lithium battery is characterized by comprising a shell (101), a winding core (102), a circuit board (103), a protective cover (104) and a positive electrode body (105), wherein the circuit board (103) is provided with an element side (1031) and a polarity side (1032) which are oppositely arranged, the shell (101) is provided with a containing groove (1011), the winding core (102) is arranged in the containing groove (1011), the circuit board (103) is arranged in a notch of the containing groove (1011), the element side (1031) faces the winding core (102), the protective cover (104) is arranged on the element side (1031), and the positive electrode body (105) is arranged on the polarity side (1032);

The negative end of the winding core (102) is in conductive connection with the polar side (1032) through the shell (101), and the positive end of the winding core (102) is in conductive connection with the positive body (105) through the protective cover (104).

2. The lithium battery according to claim 1, characterized in that the polar side (1032) is provided with a negative electrode body (1033), the housing (101) being electrically conductively connected to the negative electrode body (1033).

3. The lithium battery according to claim 1, further comprising a first sealing body (106), the first sealing body (106) being disposed between the protective cover (104) and a wall surface of the accommodation groove (1011).

4. A lithium battery according to claim 3, characterized in that the first sealing body (106) is made of plastic or silicone.

5. The lithium battery according to claim 1, further comprising a protective body (107), the protective body (107) being arranged between the protective cover (104) and the element side (1031).

6. The lithium battery according to claim 1, further comprising an explosion-proof body (108), wherein the protection cover (104) is provided with an exhaust hole (1041), and the explosion-proof body (108) is respectively connected with a wall surface of the exhaust hole (1041) and the positive electrode end of the winding core (102).

7. The lithium battery according to claim 6, further comprising a second sealing body (109), wherein the second sealing body (109) is located between the explosion-proof body (108) and the protection cover (104), and one end of the explosion-proof body (108) penetrates through the second sealing body (109) and is connected with a wall surface of the exhaust hole (1041).

8. The lithium battery according to claim 5, characterized in that the protective body (107) is a PTC thermistor.

9. The lithium battery according to claim 6, characterized in that the explosion-proof body (108) is a CID explosion-proof valve.

10. The lithium battery according to any of claims 1-9, characterized in that the housing (101) is inwardly grooved (1012).