Battery control circuit and battery control method

Abstract

The invention discloses a battery control circuit and a battery control method. The circuit comprises a monitoring unit, a control unit and a plurality of battery units connected in series, the control unit is connected with the monitoring unit and the battery units, each battery unit comprises a switching device, a first branch and a second branch, the first end of the first branch is connected with the first end of the second branch, the switching device is connected with the second end of the first branch, and the second end of the first branch is connected with the second end of the second branch. Or the first branch is connected with the second end of the second branch, and a battery monomer is connected between the first end and the second end of the first branch. The battery control circuit can control the access state of the single battery to be a bypass when the performance of the single battery is abnormal, so that the influence of the single battery with abnormal performance on the overall function of the circuit is avoided. The battery unit is provided with the two branches, and the switching device is connected with the other branch under the condition that the switching device is disconnected from the branch where the battery monomer is located, so that the condition that other battery monomers are short-circuited due to misoperation of the switching device can be avoided.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery control circuit and a battery control method. Background Art

[0002] With the rapid development of electric vehicles, energy storage systems and portable electronic devices, the requirements for battery performance are increasing. Series battery packs are widely used due to their high voltage output characteristics.

[0003] However, the performance differences between single cells (such as energy density, internal resistance, etc.) often become the key factor restricting the overall performance of the battery pack. In particular, battery cells with too low energy or too large internal resistance have a greater impact on the overall performance of the battery pack. Summary of the invention

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide a battery control circuit and a battery control method, which can control the access state of the battery cell to bypass when the performance of the battery cell is abnormal, so as to avoid the battery cell with abnormal performance from affecting the overall function of the circuit. In the present application, the battery unit is provided with two branches, and when the switch device is disconnected from the branch where the battery cell is located, it is connected to the other branch, so as to avoid the situation where the switch device malfunctions and causes short circuits of other battery cells.

[0005] In a first aspect, the present application provides a battery control circuit. The circuit includes a monitoring unit, a control unit, and a plurality of battery cells connected in series, the control unit is connected to the monitoring unit and each battery cell respectively, the battery cell includes a first branch, a second branch, and a switch device, the first end of the first branch is connected to the first end of the second branch, the switch device is connected to the second end of the first branch, or is connected to the second end of the second branch, and a battery cell is connected between the first end and the second end of the first branch;

[0006] A monitoring unit, used to obtain the status parameters of the battery cells in each battery unit and send them to the control unit;

[0007] The control unit is used to determine the performance of the battery cell according to the state parameters of the battery cell, and to switch the switch device corresponding to the battery cell to the first branch or the second branch according to the performance indication.

[0008] In combination with the first aspect, in a possible implementation manner, the second branch is a wire.

[0009] In combination with the first aspect, in a possible implementation, indicating that the switch device corresponding to the battery cell is switched to the first branch or the second branch according to the performance includes: when the performance of the battery cell is abnormal, indicating that the switch device corresponding to the battery cell is switched to the second branch.

[0010] In combination with the first aspect, in a possible implementation, indicating that the switch device corresponding to the battery cell is switched to the first branch or the second branch according to the performance includes: when the performance of the battery cell is normal, indicating that the switch device corresponding to the battery cell is switched to the first branch.

[0011] In combination with the first aspect, in a possible implementation, judging the performance of the battery cell according to the state parameters of the battery cell includes: if there is a state parameter that is not satisfied with a preset parameter condition, determining that the performance of the battery cell is abnormal.

[0012] In combination with the first aspect, in a possible implementation method, the performance of the battery cell is judged based on the state parameters of the battery cell, including: if there is a state parameter that is not satisfied with the preset parameter condition corresponding to the state parameter, and the number of state parameters that do not satisfy the preset parameter condition reaches the preset parameter number, then it is determined that the performance of the battery cell is abnormal.

[0013] In combination with the first aspect, in a possible implementation, the switching device is a single-pole double-throw switch, the fixed end of the single-pole double-throw switch is connected to an adjacent battery cell of the battery cell, and the moving end of the single-pole double-throw switch is connected to the first branch or to the second branch.

[0014] In combination with the first aspect, in a possible implementation manner, the state parameter includes at least one of resistance, voltage, current, and temperature of the battery cell.

[0015] In combination with the first aspect, in a possible implementation manner, the control unit is further configured to issue an alarm signal when it is detected that the number of battery cells with abnormal performance exceeds a preset number.

[0016] In a second aspect, the present application further provides a battery control method, which is applied to the battery control circuit described in the first aspect and any one of the first aspects. The method comprises:

[0017] Obtaining state parameters of battery cells in each battery unit;

[0018] The performance of the battery cell is determined according to the state parameters of the battery cell, and the access state of the battery cell in the circuit is adjusted according to the performance. The access state includes the switch device being connected to the first branch or the second branch.

[0019] The embodiment of the present application provides a battery control circuit and a battery control method, wherein the battery control circuit includes a monitoring unit, a control unit and a plurality of battery cells connected in series, the control unit is connected to the monitoring unit and each battery cell respectively, the battery cell includes a first branch, a second branch and a switch device, the first end of the first branch is connected to the first end of the second branch, the switch device is connected to the second end of the first branch, or is connected to the second end of the second branch, and a battery cell is connected between the first end and the second end of the first branch; the monitoring unit is used to obtain the state parameters of the battery cells in each battery cell and send them to the control unit; the control unit is used to judge the performance of the battery cell according to the state parameters of the battery cell, and switch the switch device corresponding to the battery cell to the first branch or the second branch according to the performance indication. The battery control circuit provided in the embodiment of the present application can control the access state of the battery cell in the circuit by controlling whether the switch device is connected to the branch where the battery cell is located, so that when the performance of the battery cell is abnormal, the access state of the battery cell can be controlled to be bypassed to avoid the battery cell affecting the performance of other battery cells, that is, to avoid the battery cell with abnormal performance from affecting the overall function of the circuit. In addition, in the present application, two branches are set in the battery cell. When the switching device is disconnected from the branch where the battery cell is located, it is connected to the other branch to maintain the series connection characteristics of multiple battery cells, avoid the situation where the switching device malfunctions and cause short circuits in other battery cells, and improve the stability and reliability of the battery control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 is a structural diagram of a battery control circuit in one embodiment;

[0022] Figure 2 FIG. 4 is a flow chart of a battery control method in an embodiment.

[0023] Description of reference numerals:

[0024] 10 - monitoring unit, 20 - control unit, 30 - battery unit, 31 - first branch, 32 - second branch, 311 - battery cell, 33 - switch device. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. In addition, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of objects.

[0027] With the rapid development of electric vehicles, energy storage systems and portable electronic devices, the requirements for battery performance are increasing. Series battery packs are widely used due to their high voltage output characteristics.

[0028] However, the performance differences between single cells (such as energy density, internal resistance, etc.) often become the key factor restricting the overall performance of the battery pack. In particular, battery cells with too low energy or too large internal resistance have a greater impact on the overall performance of the battery pack.

[0029] In one embodiment, Figure 1 As shown, a battery control circuit is provided, which includes a monitoring unit 10, a control unit 20 and a plurality of battery cells 30 connected in series, the control unit 20 is respectively connected to the monitoring unit 10 and each battery cell 30, the battery cell 30 includes a first branch 31, a second branch 32 and a switch device 33, the first end of the first branch 31 is connected to the first end of the second branch 32, the switch device 33 is connected to the second end of the first branch 31, or is connected to the second end of the second branch 32, and a battery cell 311 is connected between the first end and the second end of the first branch 31; the monitoring unit 10 is used to obtain the state parameters of the battery cell 311 in each battery cell 30 and send them to the control unit 20; the control unit 20 is used to judge the performance of the battery cell 311 according to the state parameters of the battery cell 311, and switch the switch device 33 corresponding to the battery cell 311 to the first branch 31 or the second branch 32 according to the performance indication.

[0030] In the embodiment of the present application, the battery control circuit includes a monitoring unit 10, a control unit 20 and a plurality of battery cells 30 connected in series, and the control unit 20 is connected to the monitoring unit 10 and each battery cell 30 respectively.

[0031] The battery cell 30 includes a first branch 31, a second branch 32 and a switch device 33. The switch device 33 is connected to the first branch 31 or the second branch 32, that is, the switch device 33 can be switched to the first branch 31 or the second branch 32. Specifically, the first end of the switch device 33 is connected to the second end of the first branch 31 or the second end of the second branch 32, and the second end of the switch device 33 is connected to an adjacent battery cell 30; the first end of the first branch 31 is connected to the first end of the second branch 32, and is connected to another adjacent battery cell 30 at the same time.

[0032] A battery cell 311 is connected between the first end and the second end of the first branch 31 ; the second branch 32 is a wire, or a resistor is connected between the first end and the second end of the second branch 32 .

[0033] The monitoring unit 10 can monitor and obtain the state parameters of the battery cells 311 in each battery unit 30 in real time, and send the monitored state parameters to the control unit 20. The state parameter can be at least one of the resistance, voltage, current, and temperature of the battery cell 311. Accordingly, the monitoring unit 10 can include at least one of a voltage sensor, a current sensor, and a temperature sensor to detect and obtain the above state parameters.

[0034] The frequency at which the monitoring unit 10 acquires the state parameters of the battery cell 311 during the monitoring process can be specifically set according to actual needs. For example, when the stability requirements of the battery cell 30 are high, the acquisition frequency of the state parameters of the battery cell 311 can be increased so that the control unit 20 can adjust the battery cell 30 in time based on the state parameters; when the stability requirements of the battery cell 30 are not high, the acquisition frequency of the state parameters can be appropriately reduced to reduce the energy loss of the battery control circuit.

[0035] The control unit 20 is used to analyze and judge the current performance of the battery cell 311 according to the state parameters of the battery cell 311 sent by the monitoring unit 10, and adjust the access state of the battery cell 311 in the battery unit 30 according to the performance of the battery cell 311. The access state of the battery cell 311 can be achieved by controlling the connection object of the switch device 33, that is, the access or bypass of the battery cell 311 is achieved by controlling the switch device 311 to connect to the first branch 31 or to the second branch 32. Specifically, when the switch device 33 is connected to the first branch 31 and disconnected from the second branch 32, the battery cell 311 is connected to the circuit; when the switch device 33 is connected to the second branch 32 and disconnected from the first branch 31, the battery cell 311 is not connected to the circuit, that is, bypassed.

[0036] The control unit 20 may determine the performance of the battery cell by normal performance or abnormal performance.

[0037] The battery control circuit provided by the embodiment of the present application includes a monitoring unit, a control unit and a plurality of battery cells connected in series, the control unit is connected to the monitoring unit and each battery cell respectively, the battery cell includes a first branch, a second branch and a switch device, the first end of the first branch is connected to the first end of the second branch, the switch device is connected to the second end of the first branch, or is connected to the second end of the second branch, and a battery cell is connected between the first end and the second end of the first branch; the monitoring unit is used to obtain the state parameters of the battery cells in each battery cell and send them to the control unit; the control unit is used to judge the performance of the battery cell according to the state parameters of the battery cell, and switch the switch device corresponding to the battery cell to the first branch or the second branch according to the performance indication. The battery control circuit provided by the embodiment of the present application can control the access state of the battery cell in the circuit by controlling whether the switch device is connected to the branch where the battery cell is located, so that in the case of abnormal performance of the battery cell, the access state of the battery cell can be controlled to be bypassed to avoid the battery cell affecting the performance of other battery cells, that is, to avoid the battery cell with abnormal performance from affecting the overall function of the circuit. In addition, in the present application, the battery cell is provided with two branches. When the switching device is disconnected from the branch where the battery cell is located, it is connected to the other branch to maintain the series connection characteristics of multiple battery cells, avoid the situation where the switching device malfunctions and cause short circuits in other battery cells, and improve the stability and reliability of the battery control circuit.

[0038] The embodiment described above provides a scheme for the control unit 20 to adjust the access state of the battery cell 311 according to the performance of the battery cell 311. In another embodiment of the present application, whether the switch device 33 is connected to the branch where the battery cell 311 is located can be adjusted according to the performance of the battery cell to achieve the adjustment of the access state of the battery cell 311. That is, the aforementioned "switching the switch device corresponding to the battery cell to the first branch or the second branch according to the performance indication" includes the following steps:

[0039] When the performance of the battery cell 311 is abnormal, the switch device 33 corresponding to the battery cell 311 is instructed to switch to the second branch 32 .

[0040] When the performance of the battery cell 311 is normal, the switch device 33 corresponding to the battery cell 311 is instructed to switch to the first branch 31 .

[0041] In the embodiment of the present application, when it is determined that the performance of a battery cell 311 is abnormal, the battery cell 311 is likely to affect other battery cells 311 and the entire series-connected battery unit 30 circuit. Therefore, the access state of the battery cell 311 with abnormal performance in the series circuit (i.e., the above-mentioned series-connected battery unit 30 circuit) is adjusted to bypass, and the switch device 33 in the battery unit 30 where the battery cell 311 with abnormal performance is located is specifically controlled, that is, the switch device 33 corresponding to the battery cell 311 with abnormal performance is disconnected from the first branch 31 to avoid the battery cell 311 with abnormal performance from affecting the series circuit; at the same time, the switch device 33 is controlled to be connected to the second branch 32 to avoid the series circuit from being disconnected, thereby ensuring the normal operation of the series circuit.

[0042] If the battery cell 311 with abnormal performance is replaced or corrected subsequently, the control unit 20 determines that the performance of the battery cell 311 is normal based on the status parameters monitored by the monitoring unit, and the access status of the battery cell 311 with normal performance can be adjusted to access, and the switch device 33 corresponding to the battery cell 311 with normal performance is specifically controlled to disconnect from the second branch 32 and connect to the first branch 31 where the battery cell 311 is located, so that the battery cell 311 with normal performance is connected to the series circuit, thereby restoring the normal function of the series circuit.

[0043] In the battery control circuit provided in the embodiment of the present application, when the performance of the battery cell is abnormal, the control unit instructs the switch device corresponding to the battery cell to switch to the second branch. When the performance of the battery cell is normal, the control unit instructs the switch device corresponding to the battery cell to switch to the first branch. In the embodiment of the present application, when the performance of the battery cell is abnormal, the control unit instructs the switch device to disconnect from the first branch where the battery cell is located to avoid the battery cell with abnormal performance from affecting the series circuit. At the same time, the control unit controls the switch device to connect to the second branch to avoid disconnection of the series circuit and ensure the normal operation of the series circuit. In addition, after the battery cell with abnormal performance is replaced or corrected, the embodiment of the present application controls the switch device to reconnect to the first branch to restore the normal function of the series circuit.

[0044] The above-mentioned embodiment introduces a scheme for judging the performance of a battery cell according to the state parameters of the battery cell. In another embodiment of the present application, the performance of the battery cell can be judged by setting preset conditions. This embodiment includes the following steps:

[0045] If there is a state parameter that is not satisfied with the preset parameter condition, it is determined that the performance of the battery cell is abnormal.

[0046] In the embodiment of the present application, a corresponding preset parameter condition can be set for each state parameter. For example, for the resistance of the battery cell, the preset parameter condition corresponding to the resistance is set to be a resistance value less than a preset resistance value; for the temperature of the battery cell, the preset parameter condition corresponding to the temperature is set to be a temperature value less than a preset temperature value.

[0047] If the state parameter meets the preset parameter condition, it means that the state parameter of the battery cell meets the normal condition, that is, the battery cell performance is normal. If the state parameter does not meet the preset parameter condition, it means that the state parameter of the battery cell does not meet the normal condition, that is, the battery cell performance is abnormal.

[0048] In the embodiment of the present application, when any state parameter of a battery cell does not satisfy a corresponding preset parameter condition, it can be determined that the performance of the battery cell is abnormal.

[0049] In a possible implementation, if there is a state parameter that is not satisfied with a preset parameter condition corresponding to the state parameter, and the number of the state parameters that do not satisfy the preset parameter condition reaches a preset parameter number, it is determined that the performance of the battery cell is abnormal.

[0050] In the embodiment of the present application, when there are no high requirements on the stability of the battery unit 30, the conditions for determining whether the battery unit performance is abnormal may include whether the state parameters meet the preset parameter conditions and the number of state parameters that do not meet the preset parameter conditions.

[0051] For example, if there is a state parameter that is not satisfied with the preset parameter condition corresponding to the state parameter, and the number of the state parameters that do not satisfy the preset parameter condition is greater than two, it is determined that the performance of the battery cell is abnormal.

[0052] In a possible implementation, the control unit 20 may also issue an alarm signal when it is detected that the number of battery cells 311 with abnormal performance exceeds a preset number. When the number of battery cells 311 with abnormal performance exceeds a preset number, it indicates that the performance of the battery cells 311 is poor, and further, the impact on the series circuit is large, requiring manual intervention, and therefore, an alarm signal may be issued to remind manual repair.

[0053] The circuit provided in the embodiment of the present application can judge the state parameters of the battery cell by setting preset parameter conditions, and then judge the performance of the battery cell, thereby improving the accuracy of the battery cell performance judgment. In addition, the present application can flexibly set the conditions for judging the performance of the battery cell, so that the judgment result is more suitable for user needs.

[0054] In one embodiment, the switch device 33 is a single-pole double-throw switch, the fixed end of the single-pole double-throw switch is connected to the adjacent battery cell of the battery cell 30, and the movable end of the single-pole double-throw switch is connected to the first branch 31 or the second branch 32.

[0055] In the embodiment of the present application, the switch device 33 may be a single-pole double-throw switch, and the battery cell 311 may be connected or bypassed by switching the connection object of the moving end of the single-pole double-throw switch. That is, when the moving end of the single-pole double-throw switch is connected to the first branch 31 where the battery cell 311 is located, the battery cell 311 is connected to the series circuit; when the moving end of the single-pole double-throw switch is connected to the second branch 32, the battery cell 311 is not connected to the series circuit.

[0056] In one possible implementation, the switch device 33 may be a single-pole double-throw relay; further, the switch device 33 may be a magnetic latching relay, which can maintain the current state without continuous power supply after the moving end connection object is switched, thereby reducing control energy consumption.

[0057] The switch device in the battery control circuit provided in the embodiment of the present application is a single-pole double-throw switch, the fixed end of the single-pole double-throw switch is connected to the adjacent battery cell of the battery cell, and the moving end of the single-pole double-throw switch is connected to the first branch or the second branch. The embodiment of the present application can quickly switch the access state of the battery cell by switching the connection object of the moving end of the single-pole double-throw switch, effectively improving the control efficiency of the battery cell.

[0058] In one embodiment, a battery control method is provided, which is applied to the battery control circuit described in the above embodiment. The battery control circuit includes a monitoring unit 10, a control unit 20 and a plurality of battery cells 30 connected in series. The control unit 20 is connected to the monitoring unit 10 and each battery cell 30 respectively. The battery cell 30 includes a first branch 31, a second branch 32 and a switch device 33. The switch device 33 is connected to the first branch 31 or the second branch 32, that is, the switch device 33 can be switched to the first branch 31 or the second branch 32. Specifically, the first end of the switch device 33 is connected to the second end of the first branch 31 or the second end of the second branch 32, and the second end of the switch device 33 is connected to the adjacent battery cell 30; the first end of the first branch 31 is connected to the first end of the second branch 32, and is connected to another adjacent battery cell 30 at the same time. A battery cell 311 is connected between the first end and the second end of the first branch 31; the second branch 32 is a wire, or a resistor is connected between the first end and the second end of the second branch 32.

[0059] Accordingly, the battery control method includes the following steps: Figure 2 Steps shown:

[0060] Step 101, obtaining the state parameters of the battery cells in each battery unit;

[0061] Step 102: determine the performance of the battery cell according to the state parameters of the battery cell, and adjust the access state of the battery cell in the circuit according to the performance.

[0062] In the embodiment of the present application, the monitoring unit 10 can monitor and obtain the state parameters of the battery cells 311 in each battery unit 30 in real time, and send the monitored state parameters to the control unit 20. The state parameter can be at least one of the resistance, voltage, current, and temperature of the battery cell 311. Accordingly, the monitoring unit 10 can include at least one of a voltage sensor, a current sensor, and a temperature sensor to detect and obtain the above state parameters.

[0063] The frequency at which the monitoring unit 10 acquires the state parameters of the battery cell 311 during the monitoring process can be specifically set according to actual needs. For example, when the stability requirements of the battery cell 30 are high, the acquisition frequency of the state parameters of the battery cell 311 can be increased so that the control unit 20 can adjust the battery cell 30 in time based on the state parameters; when the stability requirements of the battery cell 30 are not high, the acquisition frequency of the state parameters can be appropriately reduced to reduce the energy loss of the battery control circuit.

[0064] The control unit 20 first analyzes and judges the current performance of the battery cell 311 according to the state parameters of the battery cell 311 sent by the monitoring unit 10. The judgment process includes: if there is a state parameter that is not satisfied with the preset parameter condition, it is determined that the performance of the battery cell is abnormal. Or if there is a state parameter that is not satisfied with the preset parameter condition corresponding to the state parameter, and the number of state parameters that do not satisfy the preset parameter condition reaches the preset parameter number, it is determined that the performance of the battery cell is abnormal.

[0065] Specifically, a corresponding preset parameter condition can be set for each state parameter. For example, for the resistance of a battery cell, the preset parameter condition corresponding to the resistance is set to be a resistance value less than a preset resistance value; for the temperature of a battery cell, the preset parameter condition corresponding to the temperature is set to be a temperature value less than a preset temperature value. If the state parameter meets the preset parameter condition, it means that the state parameter of the battery cell meets the normal situation, that is, it can be said that the performance of the battery cell is normal. If the state parameter does not meet the preset parameter condition, it means that the state parameter of the battery cell does not meet the normal situation, that is, it can be said that the performance of the battery cell is abnormal.

[0066] When any state parameter of a battery cell does not meet the corresponding preset parameter condition, the battery cell performance may be judged to be abnormal. When there is no high requirement for the stability of the battery unit 30, the condition for judging the abnormal performance of the battery cell may include whether the state parameter meets the preset parameter condition and the number of state parameters that do not meet the preset parameter condition.

[0067] Then the control unit 20 adjusts the access state of the battery cell 311 in the battery unit 30 according to the performance of the battery cell 311. The access state of the battery cell 311 can be achieved by controlling the connection object of the switch device 33, that is, the access or bypass of the battery cell 311 is achieved by controlling the switch device 311 to connect to the first branch 31 or to the second branch 32. Specifically, when the switch device 33 is connected to the first branch 31 and disconnected from the second branch 32, the battery cell 311 is connected to the circuit; when the switch device 33 is connected to the second branch 32 and disconnected from the first branch 31, the battery cell 311 is not connected to the circuit, that is, bypassed.

[0068] Therefore, when it is determined that the performance of a battery cell 311 is abnormal, the battery cell 311 is likely to affect other battery cells 311 and the entire series-connected battery unit 30 circuit. Therefore, the access state of the battery cell 311 with abnormal performance in the series circuit (i.e., the above-mentioned series-connected battery unit 30 circuit) is adjusted to bypass, and the switch device 33 in the battery unit 30 where the battery cell 311 with abnormal performance is located is specifically controlled, that is, the switch device 33 corresponding to the battery cell 311 with abnormal performance is disconnected from the first branch 31 to avoid the battery cell 311 with abnormal performance from affecting the series circuit; at the same time, the switch device 33 is controlled to be connected to the second branch 32 to avoid the series circuit from being disconnected, thereby ensuring the normal operation of the series circuit.

[0069] If the battery cell 311 with abnormal performance is replaced or corrected subsequently, the control unit 20 determines that the performance of the battery cell 311 is normal based on the status parameters monitored by the monitoring unit, and the access status of the battery cell 311 with normal performance can be adjusted to access, and the switch device 33 corresponding to the battery cell 311 with normal performance is specifically controlled to disconnect from the second branch 32 and connect to the first branch 31 where the battery cell 311 is located, so that the battery cell 311 with normal performance is connected to the series circuit, thereby restoring the normal function of the series circuit.

[0070] The method provided in the embodiment of the present application is applied to a battery control circuit, the battery control circuit includes a monitoring unit, a control unit and a plurality of battery cells connected in series, the control unit is connected to the monitoring unit and each battery cell respectively, the battery cell includes a first branch, a second branch and a switch device, the first end of the first branch is connected to the first end of the second branch, the switch device is connected to the second end of the first branch, or is connected to the second end of the second branch, and a battery cell is connected between the first end and the second end of the first branch; the monitoring unit is used to obtain the state parameters of the battery cells in each battery cell and send them to the control unit; the control unit is used to judge the performance of the battery cell according to the state parameters of the battery cell, and switch the switch device corresponding to the battery cell to the first branch or the second branch according to the performance indication. The battery control circuit provided in the embodiment of the present application can control the access state of the battery cell in the circuit by controlling whether the switch device is connected to the branch where the battery cell is located, so that when the performance of the battery cell is abnormal, the access state of the battery cell can be controlled to be bypassed to avoid the battery cell affecting the performance of other battery cells, that is, to avoid the battery cell with abnormal performance from affecting the overall function of the circuit, thereby improving the reliability of the battery control method. In addition, the battery unit in the present application is provided with two branches. When the switch device is disconnected from the branch where the battery unit is located, it is connected to another branch to maintain the series characteristics of multiple battery units, avoiding the situation where the switch device malfunctions and causes short circuits in other battery units, further improving the stability and reliability of the battery control method. Finally, the present application can achieve the access and bypass of the battery unit through switch switching, which improves the simplicity and control efficiency of the battery control method.

[0071] It should be noted that although the operations of the method of the present invention are described in a particular order in the accompanying drawings, this does not require or imply that the operations must be performed in this particular order, or that all the operations shown must be performed to achieve the desired results. On the contrary, the steps depicted in the flow chart can be performed in a different order. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step, and / or one step can be decomposed into multiple steps.

[0072] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0073] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A battery control circuit, characterized in that: The battery control circuit comprises a monitoring unit, a control unit and a plurality of battery cells connected in series, the control unit is respectively connected to the monitoring unit and each of the battery cells, the battery cell comprises a first branch, a second branch and a switch device, the first end of the first branch is connected to the first end of the second branch, the switch device is connected to the second end of the first branch or to the second end of the second branch, and a battery cell is connected between the first end and the second end of the first branch; The monitoring unit is used to obtain the state parameters of the battery cells in each of the battery units and send them to the control unit; The control unit is used to determine the performance of the battery cell according to the state parameters of the battery cell, and instruct the switch device corresponding to the battery cell to switch to the first branch or the second branch according to the performance.

2. The circuit according to claim 1, characterized in that The second branch is a wire.

3. The circuit according to claim 1, characterized in that The switching device corresponding to the battery cell according to the performance indication is switched to the first branch or the second branch, comprising: In case that the performance of the battery cell is abnormal, the switch device corresponding to the battery cell is instructed to switch to the second branch.

4. The circuit according to claim 1, characterized in that The switching device corresponding to the battery cell according to the performance indication is switched to the first branch or the second branch, comprising: When the performance of the battery cell is normal, the switch device corresponding to the battery cell is instructed to switch to the first branch.

5. The circuit according to claim 1, characterized in that The step of judging the performance of the battery cell according to the state parameter of the battery cell comprises: If the state parameter is not satisfied with the preset parameter condition, it is determined that the performance of the battery cell is abnormal.

6. The circuit according to claim 1, characterized in that The step of judging the performance of the battery cell according to the state parameter of the battery cell comprises: If there is a state parameter that is not satisfied with the preset parameter condition corresponding to the state parameter, and the number of the state parameters that do not satisfy the preset parameter condition reaches the preset parameter number, it is determined that the performance of the battery cell is abnormal.

7. The circuit according to any one of claims 1 to 6, characterized in that: The switch device is a single-pole double-throw switch, a fixed end of the single-pole double-throw switch is connected to an adjacent battery cell of the battery cell, and a moving end of the single-pole double-throw switch is connected to the first branch or the second branch.

8. The circuit according to claim 1, characterized in that The state parameter includes at least one of the resistance, voltage, current and temperature of the battery cell.

9. The circuit according to claim 1, characterized in that The control unit is also used to send out an alarm signal when it is detected that the number of battery cells with abnormal performance exceeds a preset number.

10. A battery control method, characterized in that: Applied to the battery control circuit as claimed in claim 1, the method comprises: Obtaining state parameters of battery cells in each battery unit; The performance of the battery cell is judged according to the state parameters of the battery cell, and the access state of the battery cell in the circuit is adjusted according to the performance, wherein the access state includes the switch device being connected to the first branch or the second branch.

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