CN113644327A - Battery unit, energy storage system and battery management method - Google Patents
Battery unit, energy storage system and battery management method Download PDFInfo
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- CN113644327A CN113644327A CN202110937902.8A CN202110937902A CN113644327A CN 113644327 A CN113644327 A CN 113644327A CN 202110937902 A CN202110937902 A CN 202110937902A CN 113644327 A CN113644327 A CN 113644327A
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- 238000007726 management method Methods 0.000 title claims abstract description 39
- 238000004146 energy storage Methods 0.000 title claims abstract description 37
- 210000004027 cell Anatomy 0.000 claims description 27
- 210000005056 cell body Anatomy 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 14
- 238000007599 discharging Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4264—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing with capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses a battery unit, an energy storage system and a battery management method, which can realize that the normal operation of other battery units in a battery string is not influenced at the moment of cutting off any battery unit. The battery unit includes: the battery management system comprises a battery unit body, a battery management system, a follow current unit, a first switch unit and a second switch unit; the first switch unit is connected with the battery unit body in series and then connected with the follow current unit in parallel, and the follow current unit is also connected with the second switch unit in parallel. The battery management system is used for controlling the first switch unit to be switched off and then controlling the second switch unit to be switched on when the battery unit body is detected to meet the cutting-off condition; and when the battery unit body is detected to meet the secondary input condition, the second switch unit is controlled to be switched off first, and then the first switch unit is controlled to be switched on.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a battery unit, an energy storage system and a battery management method.
Background
In the current design of an energy storage system, a single battery or a combination of multiple single batteries is regarded as a battery unit (for example, as shown in fig. 1 a), and then multiple battery units are connected in series to form a battery string (for example, as shown in fig. 1 b), so as to meet the requirement of the energy storage system on diffusion and capacity expansion.
In the operation process of the battery string, individual battery units in the battery string need to be cut off in some occasions and put into use again after reaching a proper time. However, in the prior art, the battery string is required to be out of operation when the battery unit is cut off and put in again, which undoubtedly influences the online rate of the battery string.
Disclosure of Invention
In view of this, the present invention provides a battery unit, an energy storage system and a battery management method, so as to prevent a battery string from being disconnected before and after switching of the battery unit, thereby improving the online rate of the battery string.
A battery cell, comprising: the battery management system comprises a battery unit body, a battery management system, a follow current unit, a first switch unit and a second switch unit;
the first switch unit is connected with the battery unit body in series and then connected with the follow current unit in parallel, and the follow current unit is also connected with the second switch unit in parallel;
the battery management system is used for controlling the first switch unit to be switched off and then controlling the second switch unit to be switched on when the battery unit body is detected to meet the cutting-off condition; and when the battery unit body is detected to meet the secondary input condition, the second switch unit is controlled to be switched off first, and then the first switch unit is controlled to be switched on.
Optionally, when the battery unit body is cut off: with the disconnection of the first switch unit, the current of the branch where the first switch unit is located commutates to the branch where the follow current unit is located; with the second switch unit being closed, the current of the branch where the freewheeling unit is located commutates to the branch where the second switch unit is located;
when the battery cell body is put in again: with the disconnection of the second switch unit, the current of the branch where the second switch unit is located commutates to the branch where the follow current unit is located; with the closing of the first switch unit, the current of the branch where the freewheeling unit is located commutates to the branch where the first switch unit is located.
Optionally, a difference between the impedance of the freewheeling unit and the internal resistance of the battery cell body exceeds a threshold.
Optionally, the follow current unit includes a resistance unit and a capacitance unit, and the resistance unit is connected in series with the capacitance unit;
or the follow current unit comprises a resistance unit and an inductance unit, and the resistance unit is connected with the inductance unit in series;
or the follow current unit comprises an inductance unit and a capacitance unit, and the inductance unit is connected with the capacitance unit in series;
or the follow current unit comprises a resistance unit, an inductance unit and a capacitance unit, and the inductance unit and the capacitance unit are connected in parallel and then connected in series with the resistance unit.
Optionally, the first switch unit and the second switch unit are of a relay, a contactor, a thyristor, an IGBT, an MOS transistor, or a triode.
Optionally, the battery unit body satisfies a cutting condition, including: the battery unit body is in fault, or the battery unit body is charged until the self energy storage exceeds a first threshold value, or the battery unit body is discharged until the self energy storage is lower than a second threshold value.
Optionally, the battery unit body satisfies a reentering condition, including: the fault of the battery unit body is eliminated, or all the battery unit bodies in the battery string where the battery unit bodies are located are charged until the self energy storage exceeds the first threshold value, or all the battery unit bodies in the battery string where the battery unit bodies are discharged until the self energy storage is lower than the second threshold value.
Optionally, the controlling the first switch unit to be turned off and then controlling the second switch unit to be turned on includes: the first switch unit is controlled to be switched off, and the second switch unit is controlled to be switched on after dead time;
the controlling the second switch unit to be opened and then the first switch unit to be closed includes: the second switch unit is controlled to be switched off, and the first switch unit is controlled to be switched on after dead time.
An energy storage system, comprising: the device comprises an energy conversion device and at least one battery string connected into the energy conversion device; the battery string comprises a plurality of battery units which are connected in series, and the battery units are any one of the battery units disclosed above.
Optionally, the energy conversion device includes: at least one DC/DC circuit or DC/AC circuit or a combination of DC/DC circuit and DC/AC circuit.
Optionally, the energy conversion device is configured with a main control unit; the main control unit is in communication connection with the battery monitoring units in the battery units and is used for performing centralized management on the battery monitoring units and/or sharing the load of the battery monitoring units.
A battery management method is applied to a battery unit, wherein the battery unit comprises a battery unit body, a follow current unit, a first switch unit and a second switch unit; the first switch unit is connected with the battery unit body in series and then connected with the follow current unit in parallel, and the follow current unit is also connected with the second switch unit in parallel;
the battery management method comprises the following steps:
in the running process of the battery unit, detecting whether the battery unit body meets a cutting condition, if so, firstly controlling the first switch unit to be switched off, and then controlling the second switch unit to be switched on;
and detecting whether the battery unit body meets a re-input condition, if so, firstly controlling the second switch unit to be disconnected and then controlling the first switch unit to be closed.
Optionally, in the above battery management method, the battery cell body satisfies a cutting condition, and the method includes: the battery unit body is in fault, or the battery unit body is charged until the self energy storage exceeds a first threshold value, or the battery unit body is discharged until the self energy storage is lower than a second threshold value.
Optionally, in the battery management method, the step of allowing the battery cell body to satisfy a reentering condition includes: the fault of the battery unit body is eliminated, or all the battery unit bodies in the battery string where the battery unit bodies are located are charged until the self energy storage exceeds the first threshold value, or all the battery unit bodies in the battery string where the battery unit bodies are discharged until the self energy storage is lower than the second threshold value.
According to the technical scheme, the battery management system, the first switch unit K1, the second switch unit K2 and the follow current unit are added on the basis of the original battery unit. In the process that the battery management system switches the battery units by controlling K1 and K2, the current of the battery string can be converted by the follow current unit in the battery units, so that the battery string is not broken, and the online rate of the battery string is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1a is a schematic diagram of a battery cell structure disclosed in the prior art;
fig. 1b is a schematic diagram of a battery string structure disclosed in the prior art;
FIG. 2 is a schematic diagram of a battery cell according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a battery string structure according to an embodiment of the present invention;
fig. 4a is a schematic diagram of a current loop of the battery string shown in fig. 3 when the battery string is in a charging state and each battery unit is connected in series in the battery string loop;
fig. 4b is a schematic diagram of a current loop of the battery string corresponding to the battery cell # 2 shown in fig. 4a when K1 is turned off;
fig. 4c is a schematic diagram of a current loop of the battery string corresponding to the battery cell # 2 shown in fig. 4b when K2 is closed;
fig. 5a is a schematic diagram of a current loop of the battery string shown in fig. 3 when the battery string is in a discharging state and each battery unit is connected in series in the battery string loop;
fig. 5b is a schematic diagram of a current loop of the battery string corresponding to the battery cell # 2 shown in fig. 5a when K1 is turned off;
fig. 5c is a schematic diagram of a current loop of the battery string corresponding to the battery cell # 2 shown in fig. 5b when K2 is closed;
FIG. 6a is a schematic structural diagram of a freewheel unit according to an embodiment of the disclosure;
FIG. 6b is a schematic structural diagram of another freewheel unit according to an embodiment of the disclosure;
FIG. 6c is a schematic structural diagram of another freewheel unit according to an embodiment of the disclosure;
FIG. 6d is a schematic structural diagram of another freewheel unit according to an embodiment of the disclosure;
fig. 7 is a flowchart of a battery management method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, an embodiment of the present invention discloses a battery cell, including: a battery cell body, a battery management system (not shown in fig. 2), a freewheel unit, a first switch unit K1, and a second switch unit K2;
the first switch unit K1 is connected in series with the battery unit body and then connected in parallel with the follow current unit, and the follow current unit is also connected in parallel with the second switch unit K2;
the battery management system is used for controlling the first switch unit K1 to be switched off and then controlling the second switch unit K2 to be switched on when the battery unit body is detected to meet the cutting condition; and when the battery unit body is detected to meet the re-input condition, the second switch unit K2 is controlled to be opened firstly, and then the first switch unit K1 is controlled to be closed.
Specifically, the battery unit disclosed in the embodiment of the present invention is additionally provided with a battery management system, a first switch unit K1, a second switch unit K2 and a follow current unit on the basis of an original battery unit (the original battery unit is the battery unit body; the battery unit body is a single battery or a combination of multiple batteries, the combination can be a series combination, a parallel combination or a series-parallel combination of multiple batteries, fig. 1a only takes the series combination as an example), wherein the impedance of the follow current unit is generally set to be much larger than the internal resistance of the battery cell body and the on-resistance of the second switch unit K2 (the difference between the impedance of the follow current unit and the internal resistance of the battery cell body, and the difference between the impedance of the follow current unit and the internal resistance of the battery cell body both exceed the threshold), the switching actions of the first switching unit K1 and the second switching unit K2 are controlled by the battery management system.
The battery string is formed by connecting n battery units disclosed by the embodiment of the invention in series, wherein n is more than or equal to 2, as shown in fig. 3, the battery string can be kept from being broken before and after the switching of the battery unit body, and the specific analysis is as follows:
the states of the battery string are divided into three types: stop operation, charge operation, and discharge operation.
1) When the battery string stops operating, K1 and K2 of each battery cell are in an open state.
2) During the charging operation of the battery string, K1 of each battery cell is closed and K2 is open, and since the internal resistance of the battery cell body is much smaller than the impedance of the freewheeling unit in the same battery cell, the battery string current almost entirely flows through K1 of each battery cell and the battery cell body, and the corresponding battery string current loop is as shown in fig. 4 a.
After the battery string is charged for a period of time, assuming that the battery management system of the battery cell 2# recognizes that the battery cell body of the battery cell 2# satisfies the cut-off condition, inside the battery cell 2 #: the battery management system firstly controls the K1 to be disconnected, at the moment, the battery string current flows to the freewheeling unit, the battery unit body is bypassed, and a corresponding battery string current loop is shown in fig. 4 b; then, control K2 is closed (note that, in order to avoid the situation that K1 and K2 are closed at the same time due to the delay of the opening of K1, which forms a short circuit of the cell body, it is necessary to ensure that K2 is closed after the dead time t elapses after the opening of control K1), at this time, since the on-resistance of K2 is much smaller than the resistance of the freewheeling unit, the cell string current commutates to K2 again, the freewheeling unit is bypassed, and the corresponding cell string current loop is as shown in fig. 4 c.
When the battery management system of the battery unit 2# recognizes that the battery unit body of the battery unit 2# satisfies the reinvestment condition, the battery unit body of the battery unit 2# needs to be re-connected in series in the battery string, and then inside the battery unit 2 #: the battery management system firstly controls the K2 to be disconnected, and the current loop of the battery string is the same as that of the battery string in FIG. 4 b; then, control K1 is closed (note that, in order to avoid the delay of opening K2, K1 and K2 are closed at the same time, which forms a short circuit of the cell body, it is necessary to ensure that after the dead time t elapses after control K2 is opened, K1 is closed), and at this time, the current loop of the battery string is as shown in fig. 4 a.
3) When the battery string is in discharge operation, the control mode is consistent with that of the battery string in charge operation, and the difference is only that the current direction of the battery string is opposite, specifically:
during the discharging operation of the battery string, K1 of each battery unit is closed and K2 is opened, and the corresponding current loop of the battery string is shown in fig. 5 a. After the battery string is discharged for a period of time, if the cell body of the cell 2# satisfies the cut-off condition, the K1 of the cell 2# is controlled to be opened, and the corresponding string current loop is shown in fig. 5b, and then the K2 of the cell 2# is controlled to be closed, and the corresponding string current loop is shown in fig. 5 c. When the cell body of cell 2# satisfies the recharge condition, the K2 of cell 2# is controlled to be turned off, and the corresponding current loop of the battery string is the same as that in fig. 4 b; then, K1 of cell 2# is controlled to close, and the corresponding string current loop is the same as in fig. 5 a.
As can be seen from the above description, the embodiment of the present invention adds a battery management system, a first switch unit K1, a second switch unit K2, and a freewheeling unit on the basis of the original battery unit; in the process that the battery management system switches the battery units by controlling K1 and K2, the current of the battery string can be converted by the follow current unit in the battery units, so that the battery string is not broken, and the online rate of the battery string is improved.
Optionally, the freewheel unit in the embodiment of the present invention may include one or more of a resistance unit, an inductance unit, and a capacitance unit. For example, as shown in fig. 6a to 6 d. The freewheeling unit shown in fig. 6a includes a resistor unit R and a capacitor unit C, where the resistor unit R is connected in series with the capacitor unit C. The freewheeling unit shown in fig. 6b comprises a resistance unit R and an inductance unit L, wherein the resistance unit R is connected in series with the inductance unit L. The freewheeling unit shown in fig. 6C includes an inductance unit L and a capacitance unit C, where the inductance unit L is connected in series with the capacitance unit C. The freewheeling unit shown in fig. 6d includes a resistance unit R, an inductance unit L, and a capacitance unit C, where the inductance unit L and the capacitance unit C are connected in parallel and then connected in series with the resistance unit R. In addition, the resistance unit in the embodiment of the present invention may be an independent resistance or a combination of multiple resistances, the inductance unit may be an independent inductance or a combination of multiple inductances, and the capacitance unit may be an independent capacitance or a combination of multiple capacitances.
Optionally, the first controllable switch K1 and the second controllable switch K2 in the embodiment of the present invention may be a single switch or a combination of multiple switches, and the switch type may be, for example, any one or a combination of any multiple of a relay, a contactor, a thyristor, an IGBT, a MOS transistor, and a triode.
Optionally, the battery unit in the embodiment of the present invention is, for example, a battery pack that is common in the industry, and the battery string in the embodiment of the present invention is, for example, a battery cluster that is common in the industry.
Optionally, each component in the battery unit in the embodiment of the present invention may be packaged in one casing, and may be packaged in a plurality of casings after being grouped, without limitation.
Optionally, in the embodiment of the present invention, the battery unit body satisfies the cutting condition, which may be: the battery unit body fails, or the battery unit body is charged until the self energy storage exceeds a first threshold (the battery unit body is considered to be fully charged), or the battery unit body is discharged until the self energy storage is lower than a second threshold (the battery unit body is considered to be discharged); the first threshold value corresponding to each battery unit body in the battery string is equal, and the corresponding second threshold value is also equal. Correspondingly, the battery unit body satisfies the reinjection condition, and may be: the fault of the battery unit body is eliminated, or all the battery unit bodies in the battery string where the battery unit bodies are located are charged until the self energy storage exceeds the first threshold value, or all the battery unit bodies in the battery string where the battery unit bodies are discharged until the self energy storage is lower than the second threshold value.
The switching condition setting reason is as follows:
in the operation process of the battery unit bodies, when a fault occurs in an individual battery unit body, the fault battery unit body can be cut off in order to not influence the normal operation of other battery unit bodies in the battery string, and the fault battery unit body can be put into the battery string after the fault disappears. Based on this, the embodiment of the invention can use whether the battery unit body is in failure or not as the switching condition.
In addition, because the charge (or discharge) deadline of the battery string is the charge (or discharge) deadline of the battery unit body which is charged (or discharged) fastest, the other battery unit bodies in the battery string cannot be charged (or discharged) fully, in order to avoid the situation, the charged (or discharged) battery unit bodies can be cut off, so that the influence on the continuous charging (or discharging) of the other battery unit bodies in the battery string is avoided, and the battery unit bodies are put in after all the battery unit bodies are charged (or discharged), so that all the battery unit bodies can be charged (or discharged) fully, and on the basis, whether the battery unit bodies are charged (or discharged) or not can be used as a switching condition. Moreover, because all the battery unit bodies can be fully charged (or fully discharged), the difficulty of serious imbalance caused by mixed use of new and old battery units is solved, the new battery unit can directly replace the old battery unit, other additional operations are not needed, and the balance can be completed in the normal charging and discharging process.
In addition, the embodiment of the invention also discloses an energy storage system, which comprises: the device comprises an energy conversion device and at least one battery string connected into the energy conversion device; the battery string comprises a plurality of battery units which are connected in series, and the battery units are any one of the battery units disclosed above.
Optionally, the energy conversion device includes: at least one DC/DC circuit or DC/AC circuit or a combination of DC/DC circuit and DC/AC circuit.
Optionally, in any of the energy storage systems disclosed above, the energy conversion device is configured with a main control unit; the main control unit is in communication connection with the battery monitoring units in the battery units and is used for performing centralized management on the battery monitoring units and/or sharing the load of the battery monitoring units.
Corresponding to the embodiment of the battery unit, the embodiment of the invention also discloses a battery management method which is applied to the battery unit, wherein the battery unit comprises a battery unit body, a follow current unit, a first switch unit and a second switch unit; the first switch unit is connected with the battery unit body in series and then connected with the follow current unit in parallel, and the follow current unit is also connected with the second switch unit in parallel;
the method occurs during the operation of the battery unit, as shown in fig. 7, and includes:
step S01: detecting whether the battery unit body meets a cutting condition, if so, entering a step S02; if not, returning to the step S01;
step S02: the first switch unit is controlled to be switched off and then the second switch unit is controlled to be switched on;
step S03: detecting whether the battery unit body meets a reentering condition, if so, entering a step S04; if not, returning to the step S03;
step S04: and the second switch unit is controlled to be switched off firstly, and then the first switch unit is controlled to be switched on.
Optionally, the battery unit body satisfies a cutting condition, including: the battery unit body is in fault, or the battery unit body is charged until the self energy storage exceeds a first threshold value, or the battery unit body is discharged until the self energy storage is lower than a second threshold value.
Optionally, the battery unit body satisfies a reentering condition, including: the fault of the battery unit body is eliminated, or all the battery unit bodies in the battery string where the battery unit bodies are located are charged until the self energy storage exceeds the first threshold value, or all the battery unit bodies in the battery string where the battery unit bodies are discharged until the self energy storage is lower than the second threshold value.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the method disclosed in the embodiment, since it corresponds to the battery unit disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the description of the battery unit.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A battery cell, comprising: the battery management system comprises a battery unit body, a battery management system, a follow current unit, a first switch unit and a second switch unit;
the first switch unit is connected with the battery unit body in series and then connected with the follow current unit in parallel, and the follow current unit is also connected with the second switch unit in parallel;
the battery management system is used for controlling the first switch unit to be switched off and then controlling the second switch unit to be switched on when the battery unit body is detected to meet the cutting-off condition; and when the battery unit body is detected to meet the secondary input condition, the second switch unit is controlled to be switched off first, and then the first switch unit is controlled to be switched on.
2. The battery cell according to claim 1, wherein, when the battery cell body is cut away: with the disconnection of the first switch unit, the current of the branch where the first switch unit is located commutates to the branch where the follow current unit is located; with the second switch unit being closed, the current of the branch where the freewheeling unit is located commutates to the branch where the second switch unit is located;
when the battery cell body is put in again: with the disconnection of the second switch unit, the current of the branch where the second switch unit is located commutates to the branch where the follow current unit is located; with the closing of the first switch unit, the current of the branch where the freewheeling unit is located commutates to the branch where the first switch unit is located.
3. The battery cell according to claim 2, wherein a difference between an impedance of the freewheel unit and an internal resistance of the battery cell body exceeds a threshold value.
4. The battery unit according to claim 1, wherein the freewheel unit comprises a resistor unit and a capacitor unit, the resistor unit being connected in series with the capacitor unit;
or the follow current unit comprises a resistance unit and an inductance unit, and the resistance unit is connected with the inductance unit in series;
or the follow current unit comprises an inductance unit and a capacitance unit, and the inductance unit is connected with the capacitance unit in series;
or the follow current unit comprises a resistance unit, an inductance unit and a capacitance unit, and the inductance unit and the capacitance unit are connected in parallel and then connected in series with the resistance unit.
5. The battery unit according to claim 1, wherein the first switch unit and the second switch unit are of the type of any one or a combination of any plurality of a relay, a contactor, a thyristor, an IGBT, a MOS transistor, and a triode.
6. The battery cell according to any of claims 1-5, wherein the battery cell body satisfies a cut-out condition comprising: the battery unit body is in fault, or the battery unit body is charged until the self energy storage exceeds a first threshold value, or the battery unit body is discharged until the self energy storage is lower than a second threshold value.
7. The battery unit according to claim 6, wherein the battery unit body satisfies a reinjection condition, including: the fault of the battery unit body is eliminated, or all the battery unit bodies in the battery string where the battery unit bodies are located are charged until the self energy storage exceeds the first threshold value, or all the battery unit bodies in the battery string where the battery unit bodies are discharged until the self energy storage is lower than the second threshold value.
8. The battery unit according to any one of claims 1-5, wherein the controlling the first switch unit to open and then the second switch unit to close comprises: the first switch unit is controlled to be switched off, and the second switch unit is controlled to be switched on after dead time;
the controlling the second switch unit to be opened and then the first switch unit to be closed includes: the second switch unit is controlled to be switched off, and the first switch unit is controlled to be switched on after dead time.
9. An energy storage system, comprising: the device comprises an energy conversion device and at least one battery string connected into the energy conversion device; the battery string comprises a plurality of battery units connected in series, wherein the battery units are the battery units in any one of claims 1-8.
10. The energy storage system of claim 9, wherein the energy conversion device comprises: at least one DC/DC circuit or DC/AC circuit or a combination of DC/DC circuit and DC/AC circuit.
11. The energy storage system of claim 9 or 10, wherein the energy conversion device is configured with a master control unit; the main control unit is in communication connection with the battery monitoring units in the battery units and is used for performing centralized management on the battery monitoring units and/or sharing the load of the battery monitoring units.
12. A battery management method is applied to a battery unit and is characterized in that the battery unit comprises a battery unit body, a follow current unit, a first switch unit and a second switch unit; the first switch unit is connected with the battery unit body in series and then connected with the follow current unit in parallel, and the follow current unit is also connected with the second switch unit in parallel;
the battery management method comprises the following steps:
in the running process of the battery unit, detecting whether the battery unit body meets a cutting condition, if so, firstly controlling the first switch unit to be switched off, and then controlling the second switch unit to be switched on;
and detecting whether the battery unit body meets a re-input condition, if so, firstly controlling the second switch unit to be disconnected and then controlling the first switch unit to be closed.
13. The battery management method of claim 12, wherein the battery cell body satisfies a cut-out condition comprising: the battery unit body is in fault, or the battery unit body is charged until the self energy storage exceeds a first threshold value, or the battery unit body is discharged until the self energy storage is lower than a second threshold value.
14. The battery management method according to claim 13, wherein the battery cell body satisfies a reinvestment condition, including: the fault of the battery unit body is eliminated, or all the battery unit bodies in the battery string where the battery unit bodies are located are charged until the self energy storage exceeds the first threshold value, or all the battery unit bodies in the battery string where the battery unit bodies are discharged until the self energy storage is lower than the second threshold value.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201018044A (en) * | 2008-10-17 | 2010-05-01 | Evt Technology Co Ltd | Charging battery set, charging method, and the power components having the battery set |
| US20120280658A1 (en) * | 2010-07-30 | 2012-11-08 | Byd Company Limited | Heating circuits and methods based on battery discharging and charging using resonance components in series and freewheeling circuit components |
| CN103152628A (en) * | 2013-03-18 | 2013-06-12 | 东莞宇龙通信科技有限公司 | Network player and breakpoint play method |
| CN103163377A (en) * | 2013-03-13 | 2013-06-19 | 中国南方电网有限责任公司调峰调频发电公司 | Method for detecting internal resistance of storage battery through inductor-capacitor series discharge |
| CN203103992U (en) * | 2012-12-04 | 2013-07-31 | 江苏交科能源科技发展有限公司 | Battery module management and control system |
| CN112737041A (en) * | 2020-12-31 | 2021-04-30 | 陈玥 | Battery series charging and discharging circuit and charging and discharging control method |
-
2021
- 2021-08-16 CN CN202110937902.8A patent/CN113644327A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201018044A (en) * | 2008-10-17 | 2010-05-01 | Evt Technology Co Ltd | Charging battery set, charging method, and the power components having the battery set |
| US20120280658A1 (en) * | 2010-07-30 | 2012-11-08 | Byd Company Limited | Heating circuits and methods based on battery discharging and charging using resonance components in series and freewheeling circuit components |
| CN203103992U (en) * | 2012-12-04 | 2013-07-31 | 江苏交科能源科技发展有限公司 | Battery module management and control system |
| CN103163377A (en) * | 2013-03-13 | 2013-06-19 | 中国南方电网有限责任公司调峰调频发电公司 | Method for detecting internal resistance of storage battery through inductor-capacitor series discharge |
| CN103152628A (en) * | 2013-03-18 | 2013-06-12 | 东莞宇龙通信科技有限公司 | Network player and breakpoint play method |
| CN112737041A (en) * | 2020-12-31 | 2021-04-30 | 陈玥 | Battery series charging and discharging circuit and charging and discharging control method |
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