Anti-overvoltage processing method, system, device and equipment for battery module and medium

Abstract

The embodiment of the invention provides an anti-overvoltage processing method, system and device for a battery module, equipment and a medium, and belongs to the technical field of energy storage equipment control. The method comprises the steps that when at least part of battery modules enter an anti-overvoltage protection mode, whether a first target battery module meeting a preset exit condition exists in the at least part of battery modules or not is judged, and the preset exit condition is determined according to a battery residual capacity value, a single voltage value and an output voltage value of the battery module; and if the first target battery module exists, controlling the first target battery module to exit the anti-overvoltage protection mode. According to the scheme provided by the invention, the problem of overvoltage of the single battery is solved, and the risk of overcharging is avoided at the same time.

Description

Technical Field

[0001] The present application relates to the field of energy storage device control technology, and in particular to an overvoltage protection method, system, device, equipment and medium for a battery module. Background Art

[0002] At present, the energy storage system is mainly composed of inverter (DC / AC), battery module, energy storage converter (PCS) and battery management system (BMS). Among them, the bidirectional DCDC converter, BMS and battery cells together form a separate battery module. When the battery is close to being fully charged, the battery cell is prone to overvoltage due to the imbalance of the battery cell, increasing the risk of overcharging. Summary of the invention

[0003] In order to solve the above technical problems, the embodiments of the present application provide a method, system, device, equipment and medium for preventing overvoltage of a battery module.

[0004] In a first aspect, an embodiment of the present application provides an overvoltage protection method for a battery module, the method comprising: when at least part of the battery modules enter an overvoltage protection mode, determining whether there is a first target battery module that meets a preset exit condition in the at least part of the battery modules, the preset exit condition being determined according to a battery remaining capacity value, a single cell voltage value, and an output voltage value of the battery module;

[0005] If the first target battery module exists, the first target battery module is controlled to exit the overvoltage protection mode.

[0006] In one embodiment, the preset exit condition includes: a first preset exit condition; the first preset exit condition includes at least one of the following: the battery remaining capacity value of the battery module is less than or equal to the first battery remaining capacity threshold value, and the single cell voltage value of the battery module is less than or equal to the first preset voltage threshold value;

[0007] The determining whether there is a first target battery module that meets a preset exit condition in at least part of the battery modules includes:

[0008] Determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the requirement that the remaining battery capacity value of the battery module is less than or equal to the first remaining battery capacity value threshold, and / or determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the requirement that the single cell voltage value of the battery module is less than or equal to the first preset voltage threshold.

[0009] In one embodiment, the preset exit condition includes: a second preset exit condition; the second preset exit condition includes at least one of the following: the output voltage value of the battery module is less than or equal to the second preset voltage threshold, and the output voltage value of the battery module is greater than or equal to the third preset voltage threshold;

[0010] The determining whether there is a first target battery module that meets a preset exit condition in at least part of the battery modules includes:

[0011] Determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the output voltage value of the battery module is less than or equal to the second preset voltage threshold, and / or determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the output voltage value of the battery module is greater than or equal to the third preset voltage threshold.

[0012] In one embodiment, an input voltage value, a transformer turns ratio value, and a preset voltage difference value of the battery module are obtained;

[0013] The second preset voltage threshold is obtained according to the input voltage value of the battery module, the transformer turns ratio value and the preset voltage difference.

[0014] In one embodiment, when at least part of the battery modules enter the overvoltage protection mode, it is determined whether the remaining battery modules are in a discharge state;

[0015] If the remaining battery modules are in the discharging state, at least part of the battery modules are controlled to exit the overvoltage protection mode.

[0016] In one embodiment, if the remaining battery modules are in a charging state, it is re-determined whether the remaining battery capacity values ​​of at least some of the battery modules and the single cell voltage values ​​of at least some of the battery modules meet the preset start-up overvoltage protection conditions.

[0017] In one embodiment, it is determined whether there is a second target battery module in each of the battery modules whose remaining battery capacity value and single cell voltage value meet a preset overvoltage protection start condition, wherein the preset overvoltage protection start condition includes: the remaining battery capacity value is equal to a second remaining battery capacity threshold value and the single cell voltage value is greater than or equal to a fourth preset voltage threshold value;

[0018] If the second target battery module exists, then after waiting for a preset time, the second target battery module is controlled to enter the anti-overvoltage protection mode.

[0019] In a second aspect, an embodiment of the present application provides an overvoltage protection system for a battery module, the system comprising: at least one battery module, a communication bus and an energy storage converter module; wherein the energy storage converter module comprises: a control bus;

[0020] The first ends of the battery modules are electrically connected via the communication bus;

[0021] The second end of each of the battery modules is electrically connected to the control bus of the energy storage converter module;

[0022] When at least part of the battery modules enter the overvoltage protection mode, at least part of the battery modules execute the overvoltage protection method for the battery modules described in the first aspect.

[0023] In a third aspect, an embodiment of the present application provides an overvoltage protection device for a battery module, the overvoltage protection device for a battery module comprising:

[0024] A judgment module, used for judging whether there is a first target battery module that meets a preset exit condition in at least some of the battery modules when at least some of the battery modules enter the overvoltage protection mode, wherein the preset exit condition is determined according to the remaining battery capacity value, the single cell voltage value and the output voltage value of the battery module;

[0025] A control module is used for controlling the first target battery module to exit the anti-overvoltage protection mode if the first target battery module exists.

[0026] In a fourth aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and when the processor is running, the computer program executes the overvoltage protection method for the battery module provided in the first aspect.

[0027] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, which, when running on a processor, executes the overvoltage protection method for the battery module provided in the first aspect.

[0028] The above-mentioned battery module anti-overvoltage processing method, system, device, equipment and medium provided in the present application include: when at least part of the battery modules enter the anti-overvoltage protection mode, judging whether there is a first target battery module that meets the preset exit condition in the at least part of the battery modules, and the preset exit condition is determined according to the remaining battery capacity value, single cell voltage value and output voltage value of the battery module; if the first target battery module exists, the first target battery module is controlled to exit the anti-overvoltage protection mode, and by setting the anti-overvoltage protection mode and judging the preset exit condition of the battery module entering the anti-overcharge mode, the battery overcharging is effectively avoided and the battery life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope of protection of the present application. In each of the drawings, similar components are numbered similarly.

[0030] Figure 1 A schematic diagram of a process flow of an overvoltage protection method for a battery module provided in an embodiment of the present application is shown;

[0031] Figure 2 A schematic diagram of a process flow of a single-machine system overvoltage protection mode 1 provided in an embodiment of the present application is shown;

[0032] Figure 3 A schematic diagram of a process flow of an overvoltage protection mode for a parallel system provided in an embodiment of the present application is shown;

[0033] Figure 4 A circuit diagram of a bidirectional DCDC conversion unit provided in an embodiment of the present application is shown;

[0034] Figure 5 A schematic structural diagram of an overpressure prevention system for a battery module provided in an embodiment of the present application is shown;

[0035] Figure 6 A schematic structural diagram of an overpressure prevention device for a battery module provided in an embodiment of the present application is shown;

[0036] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown.

[0037] Icons: 500 - anti-overpressure processing system for battery module, 600 - anti-overpressure processing device for battery module, 601 - judgment module, 602 - control module, 700 - electronic device, 701 - transceiver, 702 - processor, 703 - memory. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0039] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0040] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present application, are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0041] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0042] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0043] Example 1

[0044] At present, during the charging process of the energy storage system, due to differences in the remaining capacity value (State of Charge, SOC) and the state of health (State of Health, SOH) of the battery, the time for each battery module in the energy storage system to reach the full charge state is inconsistent. Since each battery module cannot actively reduce the current to zero, the battery module that is fully charged in advance will continue to receive current, thereby causing a battery overcharge failure. Therefore, an embodiment of the present application provides an overvoltage protection method for a battery module.

[0045] See also Figure 1 , Figure 1 A schematic flow chart of an overvoltage protection method for a battery module provided in an embodiment of the present application, the method comprising: S101 to S102.

[0046] S101, when at least some of the battery modules enter the overvoltage protection mode, determine whether there is a first target battery module that meets a preset exit condition in at least some of the battery modules, and the preset exit condition is determined according to the remaining battery capacity value, single cell voltage value and output voltage value of the battery module.

[0047] It should be noted that the present application can be divided into a single-machine system overvoltage protection mode or a parallel system overvoltage protection mode to control the battery modules. If the number of battery modules is greater than 1, each battery module is controlled to enter the parallel system overvoltage protection mode. If the number of battery modules is equal to 1, the battery module is controlled to enter the single-machine system overvoltage protection mode. Among them, the single-machine system overvoltage protection mode does not need to judge whether all battery modules have entered the overvoltage protection mode.

[0048] It is further explained that at least some of the battery modules entering the overvoltage protection mode includes the situation where all the battery modules enter the overvoltage protection mode.

[0049] The present application proposes to select different overvoltage protection modes according to the number of battery modules, thereby further improving the flexibility of overvoltage protection for battery modules.

[0050] In one embodiment, if Figure 2 As shown, Figure 2 The flowchart of the overvoltage protection mode of a stand-alone system, wherein the preset exit conditions include: a first preset exit condition; the first preset exit condition includes at least one of the following: a remaining battery capacity value of the battery module is less than or equal to a first remaining battery capacity threshold, and a single cell voltage value of the battery module is less than or equal to a first preset voltage threshold; judging whether there is a first target battery module satisfying the preset exit condition in at least some of the battery modules, including: judging whether there is a first target battery module satisfying the condition that the remaining battery capacity value of the battery module is less than or equal to the remaining battery capacity value threshold in at least some of the battery modules, and / or judging whether there is a first target battery module satisfying the condition that the single cell voltage value of the battery module is less than or equal to the first preset voltage threshold in at least some of the battery modules.

[0051] It should be noted that when the battery module enters the overvoltage protection mode, the present application determines two types of preset exit conditions according to the state of the energy storage system, and simultaneously obtains the battery remaining capacity value, single cell voltage value and output voltage value of the battery module. If it meets any of the preset exit conditions, the battery module is controlled to exit the overvoltage protection mode. By monitoring the state of the battery module in real time and exiting the overvoltage protection mode in time when the preset conditions are met, the battery module can be prevented from being in an overvoltage state for a long time, thereby reducing the risk of battery damage and safety accidents.

[0052] In one embodiment, the preset exit condition includes: a second preset exit condition, the second preset exit condition includes at least one of the following: the output voltage value of the battery module is less than or equal to the second preset voltage threshold, and the output voltage value of the battery module is greater than or equal to the third preset voltage threshold; judging whether there is a first target battery module that satisfies the preset exit condition in at least some of the battery modules, including: judging whether there is a first target battery module that satisfies the output voltage value of the battery module is less than or equal to the second preset voltage threshold in at least some of the battery modules, and / or judging whether there is a first target battery module that satisfies the output voltage value of the battery module is greater than or equal to the third preset voltage threshold in at least some of the battery modules.

[0053] At present, when the battery is close to being fully charged, the problem of cell overvoltage is prone to occur due to the imbalance of the cell. In addition, due to the replacement of old and new batteries in the system, the pressure difference of each battery module is different, which may also cause the problem of cell overvoltage, increasing the risk of overcharging.

[0054] Therefore, this application sets two types of exit conditions to judge the battery cell voltage value, battery remaining capacity value and output voltage value in real time, and sets the first battery remaining capacity threshold, the first preset voltage threshold, the second preset voltage threshold and the third preset voltage threshold to avoid the problem of battery cell overvoltage.

[0055] In this embodiment, the first battery remaining capacity threshold is set to 99%, the first preset voltage threshold is 3.45V, the second preset voltage threshold is a calculated value, and the third preset voltage threshold is 460V. The thresholds set in this application are measured by the BMS inside the battery. When the battery stops charging, since the bidirectional DCDC converter will have some losses, after a period of inactivity, the battery remaining capacity value threshold and the cell voltage will drop accordingly. Therefore, by setting a reasonable exit threshold, it is ensured that the overvoltage protection mode is exited in time under the premise of battery module safety to restore its normal working state.

[0056] It should be noted that after the battery module enters the overvoltage protection mode, the inverter may control the battery module to charge or discharge. If the inverter charges the battery module, it will control the voltage to increase, and it is necessary to determine whether the voltage value of the battery module is greater than the preset maximum value of the battery module. If the inverter discharges the battery module, it is necessary to determine whether the voltage value of the battery module is less than the preset minimum threshold of the battery module.

[0057] It is further explained that the highest normal operating voltage that the inverter can control the battery module to increase is 450V. After entering the overvoltage protection mode, if the inverter charges the battery module, the voltage will be instantly raised, so the DCDC converter needs to control the battery module to exit the overvoltage protection mode to allow the battery module to charge normally. The third preset voltage threshold set in this embodiment is 460V. When setting the third preset voltage threshold, this application sets it 10V more than the highest normal operating voltage of 450V. In other embodiments, any voltage value between 450V and 550V can be selected.

[0058] In one embodiment, the input voltage value of the battery module, the transformer turns ratio value and the preset voltage difference value are obtained; and the second preset voltage threshold is obtained according to the input voltage value of the battery module, the transformer turns ratio value and the preset voltage difference value.

[0059] It should be noted that each battery module includes a bidirectional DCDC converter, wherein the bidirectional DCDC conversion unit circuit includes an LLC transformer T1. The present application obtains the multiplication value of the input voltage value of the battery module and the transformer turns ratio value, and obtains the second preset voltage threshold value according to the sum of the multiplication value and the preset voltage difference value, wherein the input voltage value of the battery module is obtained through BMS collection.

[0060] For example, the second preset voltage threshold obtained in this application is the input voltage value Vin*8-25V. Among them, the 8 in Vin*8 is the turns ratio of the LLC transformer T1, and the specific value is subject to the turns ratio of the actual product transformer. Since the primary and secondary turns of the LLC transformer T1 used in this application are 2:16, the turns ratio n is 16 / 2=8.

[0061] -25V is the voltage bias value obtained through actual debugging and verification, which is related to the product's load conditions. This value can be adjusted, but if it is increased, it may affect the dynamic response and cause the system to crash; if it is reduced, the instantaneous sampling may be disturbed during the dynamic response process, causing false triggering.

[0062] The present application obtains a second preset voltage threshold by multiplying the input voltage value of the battery module by the number of transformer turns and subtracting the bias value. If it is detected that the output voltage of the battery module is less than or equal to the second preset voltage threshold, the energy storage system is controlled to exit the anti-overcharge protection module. When the energy storage system has an emergency response discharge to meet the load demand, the present application can ensure that the battery module can respond quickly and discharge safely, reducing unnecessary energy loss.

[0063] Before step S101, it also includes: in one embodiment, determining whether there is a second target battery module in each battery module whose remaining battery capacity value and single cell voltage value meet the preset start-up overvoltage protection condition, wherein the preset start-up overvoltage protection condition includes: the remaining battery capacity value is equal to the second remaining battery capacity threshold and the single cell voltage value is greater than or equal to the fourth preset voltage threshold; if there is a second target battery module, then after waiting for a preset time, the second target battery module is controlled to enter the anti-overvoltage protection mode.

[0064] It should be noted that the preset waiting time is set to 1S in the present application. In other implementations, the preset time can be set according to needs, but the length of the preset time needs to be controlled. If the waiting time is too long, the single cell voltage value of the battery module may be too large, resulting in an overvoltage fault.

[0065] The second battery remaining capacity threshold value set in the present application is 100%, and the fourth preset voltage threshold value is 3.54V. When the battery remaining capacity value of the battery module is equal to 100% and the single cell voltage value is greater than or equal to 3.54V, the battery module is controlled to enter the overvoltage protection mode.

[0066] In one embodiment, when at least part of the battery modules enter the overvoltage protection mode, it is determined whether the remaining battery modules are in a discharge state; if the remaining battery modules are in a discharge state, at least part of the battery modules are controlled to exit the overvoltage protection mode.

[0067] like Figure 3 As shown, Figure 3 This is a flow chart of the overvoltage protection mode of the parallel system. When it is determined that the battery module that meets the preset overvoltage protection start condition enters the overvoltage protection mode, it is determined whether all battery modules have entered the overvoltage protection mode. If not, the remaining battery modules that have not entered the overvoltage protection mode are obtained, and the charge and discharge status of the remaining battery modules is determined. If the remaining battery modules are in the discharge state, the battery modules that have entered the overvoltage protection mode are controlled to exit the overvoltage protection mode.

[0068] In one embodiment, if the remaining battery modules are in a charging state, it is re-determined whether the remaining battery capacity values ​​of at least some of the battery modules and the single cell voltage values ​​of at least some of the battery modules meet the preset start-up overvoltage protection conditions.

[0069] When the number of battery modules is greater than 1, if only at least some of the battery modules enter the overvoltage protection mode, obtain the remaining battery modules that have not entered the overvoltage protection mode, and judge the charge and discharge status of the remaining battery modules. If the remaining battery modules are in the charging state, control each battery module to re-judge whether the preset overvoltage protection start conditions are met.

[0070] The present application determines whether multiple battery modules are in the overvoltage protection mode of the parallel state, and further determines the charge and discharge status of the remaining battery modules that have not entered the overvoltage protection mode. For the modules that have not entered the protection mode, by determining their charge and discharge status, the battery module is prevented from mistakenly entering the anti-charge protection mode in the discharge state, thereby preventing the battery module from being damaged or causing a safety accident.

[0071] S102: If the first target battery module exists, control the first target battery module to exit the overvoltage protection mode.

[0072] It should be noted that the specific bidirectional DCDC conversion unit circuit diagram is as follows Figure 4 As shown, the driving duty cycle of the MOS tubes Q1 to Q8 is controlled to be 0 by the control chip of the DCDC converter, and the MOS tubes of the battery modules that meet the preset start-up conditions are turned off to disconnect the charging circuit to avoid the risk of battery overcharging. The control chip of the DCDC converter controls the MOS tubes of each battery module to be turned on at the same time, and adjusts the driving duty cycle of each MOS tube to reach the maximum.

[0073] The present embodiment provides an anti-overvoltage processing method for battery modules. When at least part of the battery modules enter the anti-overvoltage protection mode, it is determined whether there is a first target battery module that meets a preset exit condition in at least part of the battery modules. The preset exit condition is determined according to the remaining battery capacity value, single cell voltage value and output voltage value of the battery module. If there is a first target battery module, the first target battery module is controlled to exit the anti-overvoltage protection mode. By setting the anti-overvoltage protection mode and judging the preset exit condition of the battery module entering the anti-overcharge mode, overcharging of the battery is effectively avoided and the service life of the battery is extended.

[0074] Example 2

[0075] In addition, an embodiment of the present application provides an overpressure prevention processing system 500 for a battery module.

[0076] like Figure 5 As shown, the system includes: at least one battery module, a communication bus and an energy storage conversion module; wherein the energy storage conversion module includes: a control bus;

[0077] The first ends of the battery modules are electrically connected via a communication bus;

[0078] The second end of each battery module is electrically connected to the control bus of the energy storage converter module;

[0079] When at least part of the battery modules enter the overvoltage protection mode, at least part of the battery modules execute the overvoltage protection method of the battery modules of the first embodiment.

[0080] The overpressure prevention system 500 for battery modules provided in the embodiment of the present application can execute the steps of the overpressure prevention method for battery modules provided in the above-mentioned method embodiment 1, which will not be described again here to avoid repetition.

[0081] Example 3

[0082] In addition, an embodiment of the present application provides an overpressure protection device for a battery module.

[0083] like Figure 6 As shown, the overpressure protection device 600 for the battery module includes:

[0084] A judgment module 601 is used to judge whether there is a first target battery module that meets a preset exit condition in at least some of the battery modules when at least some of the battery modules enter the overvoltage protection mode, where the preset exit condition is determined according to the remaining battery capacity value, the single cell voltage value and the output voltage value of the battery module;

[0085] The control module 602 is configured to control the first target battery module to exit the overvoltage protection mode if the first target battery module exists.

[0086] The overvoltage protection device 600 for the battery module provided in this embodiment can implement the overvoltage protection method for the battery module provided in Embodiment 1, and will not be described again here to avoid repetition.

[0087] Example 4

[0088] In addition, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program runs on the processor, the overvoltage protection method for the battery module provided in Example 1 is executed.

[0089] For details, see Figure 7 The electronic device 700 includes: a transceiver 701, a bus interface and a processor 702, wherein the processor 702 is used to: when at least some of the battery modules enter the overvoltage protection mode, determine whether there is a first target battery module that meets a preset exit condition in at least some of the battery modules, and the preset exit condition is determined according to the remaining battery capacity value, the single cell voltage value and the output voltage value of the battery module; if there is a first target battery module, control the first target battery module to exit the overvoltage protection mode.

[0090] In one embodiment, the processor 702 is further configured to: the preset exit condition includes: a first preset exit condition; the first preset exit condition includes at least one of the following: the battery remaining capacity value of the battery module is less than or equal to the first battery remaining capacity threshold value, and the single cell voltage value of the battery module is less than or equal to the first preset voltage threshold value;

[0091] Determining whether there is a first target battery module that meets a preset exit condition in at least some of the battery modules includes:

[0092] Determine whether there is a first target battery module in at least some of the battery modules that satisfies the requirement that the remaining battery capacity value of the battery module is less than or equal to a remaining battery capacity value threshold, and / or determine whether there is a first target battery module in at least some of the battery modules that satisfies the requirement that the single cell voltage value of the battery module is less than or equal to a first preset voltage threshold.

[0093] In one embodiment, the processor 702 is further configured to: the preset exit condition includes: a second preset exit condition, the second preset exit condition includes at least one of the following: the output voltage value of the battery module is less than or equal to the second preset voltage threshold, the output voltage value of the battery module is greater than or equal to the third preset voltage threshold;

[0094] Determining whether there is a first target battery module that meets a preset exit condition in at least some of the battery modules includes:

[0095] Determine whether there is a first target battery module in at least some of the battery modules that satisfies the output voltage value of the battery module less than or equal to the second preset voltage threshold, and / or determine whether there is a first target battery module in at least some of the battery modules that satisfies the first target voltage threshold.

[0096] In one embodiment, the processor 702 is further used to: obtain the input voltage value, transformer turns ratio and preset voltage difference of the battery module; and obtain a second preset voltage threshold according to the input voltage value, transformer turns ratio and preset voltage difference of the battery module.

[0097] In one embodiment, the processor 702 is further used to: when at least part of the battery modules enter the overvoltage protection mode, determine whether the remaining battery modules are in a discharge state; if the remaining battery modules are in a discharge state, control at least part of the battery modules to exit the overvoltage protection mode.

[0098] In one embodiment, the processor 702 is further used to: if the remaining battery modules are in a charging state, re-determine whether the battery remaining capacity values ​​of at least some of the battery modules and the single cell voltage values ​​of at least some of the battery modules meet the preset start-up overvoltage protection conditions.

[0099] In one embodiment, the processor 702 is also used to: determine whether there is a second target battery module in each battery module whose remaining battery capacity value and single cell voltage value meet the preset start-up overvoltage protection conditions, wherein the preset start-up overvoltage protection conditions include: the remaining battery capacity value is equal to the second remaining battery capacity threshold and the single cell voltage value is greater than or equal to the fourth preset voltage threshold; if there is a second target battery module, then after waiting for a preset time, the second target battery module is controlled to enter the anti-overvoltage protection mode.

[0100] In the embodiment of the present application, the electronic device 700 further includes: a memory 703. Figure 7 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 702 and memory represented by memory 703. The bus architecture may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 701 may be a plurality of components, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 702 is responsible for managing the bus architecture and general processing, and the memory 703 may store data used by the processor 702 when performing operations.

[0101] The electronic device 700 provided in the embodiment of the present application can execute the steps of the overvoltage protection method for the battery module provided in the above method embodiment 1, which will not be described again here to avoid repetition.

[0102] Example 5

[0103] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the overvoltage protection method for the battery module provided in Example 1 is implemented.

[0104] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0105] The computer-readable storage medium provided in this embodiment can implement the overvoltage protection method for the battery module provided in Example 1, and will not be described again here to avoid repetition.

[0106] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or terminal including the element.

[0107] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods of each embodiment of the present application.

[0108] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for preventing overvoltage of a battery module, characterized in that: The method comprises: When at least some of the battery modules enter the overvoltage protection mode, determining whether there is a first target battery module that meets a preset exit condition in the at least some of the battery modules, wherein the preset exit condition is determined according to a battery remaining capacity value, a single cell voltage value, and an output voltage value of the battery module; If the first target battery module exists, the first target battery module is controlled to exit the overvoltage protection mode.

2. The overpressure protection method for a battery module according to claim 1, characterized in that: The preset exit condition includes: a first preset exit condition; the first preset exit condition includes at least one of the following: the battery remaining capacity value of the battery module is less than or equal to the first battery remaining capacity threshold value, and the single cell voltage value of the battery module is less than or equal to the first preset voltage threshold value; The determining whether there is a first target battery module that meets a preset exit condition in at least part of the battery modules includes: Determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the requirement that the remaining battery capacity value of the battery module is less than or equal to the first remaining battery capacity value threshold, and / or determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the requirement that the single cell voltage value of the battery module is less than or equal to the first preset voltage threshold.

3. The overpressure prevention method for a battery module according to claim 2, characterized in that: The preset exit condition includes: a second preset exit condition; the second preset exit condition includes at least one of the following: the output voltage value of the battery module is less than or equal to the second preset voltage threshold, and the output voltage value of the battery module is greater than or equal to the third preset voltage threshold; The determining whether there is a first target battery module that meets a preset exit condition in at least part of the battery modules includes: Determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the output voltage value of the battery module is less than or equal to the second preset voltage threshold, and / or determine whether there is any of the first target battery modules among at least some of the battery modules that satisfies the output voltage value of the battery module is greater than or equal to the third preset voltage threshold.

4. The overpressure protection method for a battery module according to claim 3, characterized in that: Acquiring the second preset voltage threshold includes: Obtaining an input voltage value, a transformer turns ratio value, and a preset voltage difference value of the battery module; The second preset voltage threshold is obtained according to the input voltage value of the battery module, the transformer turns ratio value and the preset voltage difference.

5. The overpressure prevention method for a battery module according to claim 1, characterized in that: The method further comprises: When at least part of the battery modules enter the overvoltage protection mode, determining whether the remaining battery modules are in a discharging state; If the remaining battery modules are in the discharging state, at least part of the battery modules are controlled to exit the overvoltage protection mode.

6. The overpressure protection method for a battery module according to claim 5, characterized in that: After determining whether the remaining battery modules are in a discharging state, the method includes: If the remaining battery modules are in a charging state, it is re-determined whether the remaining battery capacity values ​​of at least some of the battery modules and the single cell voltage values ​​of at least some of the battery modules meet the preset start-up overvoltage protection conditions.

7. The overpressure protection method for a battery module according to claim 1, characterized in that: The method further comprises: Determine whether there is a second target battery module in each of the battery modules whose remaining battery capacity value and single cell voltage value meet a preset overvoltage protection start condition, wherein the preset overvoltage protection start condition includes: the remaining battery capacity value is equal to a second remaining battery capacity threshold, and the single cell voltage value is greater than or equal to a fourth preset voltage threshold; If the second target battery module exists, then after waiting for a preset time, the second target battery module is controlled to enter the anti-overvoltage protection mode.

8. A battery module overpressure prevention system, characterized in that: The system comprises: at least one battery module, a communication bus and an energy storage and conversion module; wherein the energy storage and conversion module comprises: a control bus; The first ends of the battery modules are electrically connected via the communication bus; The second end of each of the battery modules is electrically connected to the control bus of the energy storage converter module; When at least part of the battery modules enter the overvoltage protection mode, at least part of the battery modules execute the overvoltage protection processing method for the battery modules according to any one of claims 1-7.

9. An overpressure prevention device for a battery module, characterized in that: The device comprises: A judgment module, used for judging whether there is a first target battery module that meets a preset exit condition in at least some of the battery modules when at least some of the battery modules enter the overvoltage protection mode, wherein the preset exit condition is determined according to the remaining battery capacity value, the single cell voltage value and the output voltage value of the battery module; A control module is used for controlling the first target battery module to exit the anti-overvoltage protection mode if the first target battery module exists.

10. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is run by the processor, the overvoltage protection method for a battery module according to any one of claims 1 to 7 is executed.

11. A computer-readable storage medium, characterized in that: The computer program is stored therein, and when the computer program is run on a processor, the overvoltage protection method for a battery module according to any one of claims 1 to 7 is executed.

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