Battery equalization control method and system and storage medium

Abstract

The invention relates to a battery equalization control method and system and a storage medium, and the method comprises the steps: obtaining the collection data of a battery module after a passive equalization mode is switched to an active equalization mode, and carrying out the active equalization processing of the battery module when the collection data meets a preset equalization triggering condition, and obtaining a target battery module; and detecting the equalization state of each target battery module in the target battery modules, determining the target battery modules of which the equalization states meet a preset equalization state condition as abnormal battery modules, realizing active equalization control of the battery modules, and identifying the abnormal battery modules. According to the invention, the battery energy storage system only having passive equalization can obtain the active equalization capability, the equalization effect and equalization efficiency of the battery module are improved, and the abnormal battery module can be automatically identified.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery balancing control method, system, and storage medium. Background Art

[0002] With the rapid development of the energy storage industry, the number of battery energy storage systems has rapidly increased. As the number of cycles in a battery energy storage system increases, its consistency inevitably decreases, which in turn increases the voltage difference between the battery's charge and discharge terminals, reduces the battery energy storage system's charge and discharge capacity, and causes the battery energy storage system to fail to meet its operating specifications. To ensure that battery energy storage systems meet their operating specifications, they are typically equipped with passive balancing. Passive balancing is effective for a small number of cells with high charge and discharge rates, but is less effective for cells with low discharge rates or a large number of cells with reduced consistency.

[0003] Currently, in existing battery energy storage system balancing methods, manual balancing is usually used to make up for the shortcomings of passive balancing. However, manual balancing is difficult to identify abnormal cells, the balancing effect is poor, and the efficiency of manual balancing is low. Summary of the Invention

[0004] Based on this, a battery balancing control method, system and storage medium are provided.

[0005] In a first aspect, the present application provides a battery balancing control method, which is applied to a balancing control module. The balancing control module is connected to a battery module, and the battery module includes multiple battery modules. The battery balancing control method includes the following steps:

[0006] After switching from passive balancing mode to active balancing mode, the collected data of the battery module is obtained. When the collected data meets the preset balancing trigger conditions, the battery module is actively balanced to obtain the target battery module;

[0007] The balancing state of each target battery module in the target battery module is detected, and the target battery module whose balancing state meets the preset balancing state condition is determined as an abnormal battery module, wherein the target battery module is a battery module in the target battery module that has undergone active balancing processing.

[0008] In one embodiment, the balancing control module includes a first balancing control module, and the first balancing control module is used to connect the battery modules; the method further includes:

[0009] Based on the preset format of the first balancing control module, performing format conversion processing on the collected data obtained in the active balancing mode to obtain converted collected data;

[0010] The converted collected data is transmitted to the first balancing control module, so that the first balancing control module controls each battery module to charge or discharge.

[0011] In one embodiment, the balancing control module further includes a second balancing control module, which is configured to connect the first balancing control module and each battery module. Switching from the passive balancing mode to the active balancing mode includes:

[0012] When the time for the battery module to finish discharging meets the preset time, the second balancing control module is connected to the first balancing control module and each battery module respectively, and the connection between the first balancing control module and each battery module is disconnected.

[0013] In one embodiment, the method further comprises:

[0014] Repair or replace abnormal battery modules;

[0015] When the abnormal battery module is repaired or replaced, the active balancing mode is exited to enter the passive balancing mode.

[0016] In one embodiment, exiting the active balancing mode includes: disconnecting the second balancing control module from the first balancing control module and each battery module;

[0017] Entering the passive balancing mode includes: establishing a connection between the first balancing control module and each battery module.

[0018] In one embodiment, the collected data includes voltage values ​​of each battery module;

[0019] The preset balancing trigger condition includes: the target difference value corresponding to any battery module falls outside the preset voltage error range, wherein: the target difference value is the difference between the voltage value corresponding to the battery module and the average value of the voltage values ​​of each battery module;

[0020] Active balancing is performed on the battery modules, including: performing active balancing on the battery modules whose corresponding voltage differences fall outside a preset voltage error range so that the voltage differences fall within the preset voltage error range.

[0021] In one embodiment, the method further includes, after executing the step of actively balancing the battery module, entering a full-time balancing working state, and executing the step of detecting the balancing status of each target battery module in the target battery module in the full-time balancing working state.

[0022] In one embodiment, detecting the balancing state of each target battery module in the target battery module and determining the target battery module whose balancing state meets a preset balancing state condition as an abnormal battery module includes:

[0023] If it is detected within the first preset time that the balancing state of the target battery module includes charging balancing and discharging balancing, the corresponding target battery module is determined to be an abnormal battery module;

[0024] If the balancing state of the target battery module is detected as discharge balancing within the second preset time, the corresponding target battery module is determined to be an abnormal battery module.

[0025] In a second aspect, the present application further provides a battery balancing control system, comprising a balancing control module and a battery module, wherein the balancing control module is connected to the battery module;

[0026] The balancing control module is used to execute any one of the steps of the above-mentioned battery balancing control method.

[0027] In one embodiment, the balancing control module includes a first balancing control module and a second balancing control module, the battery module includes a plurality of battery modules, the first balancing control module is used to connect the battery modules; the second balancing control module is used to connect the first balancing control module and the battery modules;

[0028] The second balancing control module is configured to execute any one of the steps of the above-mentioned battery balancing control method.

[0029] In one embodiment, the first balancing control module includes a first master control unit and a plurality of first slave control units corresponding to the plurality of battery modules; the second balancing control module includes a second master control unit and a plurality of second slave control units corresponding to the plurality of battery modules;

[0030] The first master control unit is connected to each first slave control unit, and the first slave control unit is used to be detachably connected to the corresponding battery module;

[0031] The second master control unit is connected to the first master control unit and each second slave control unit respectively, and the second slave control unit is used for detachably connecting to the corresponding battery module.

[0032] In a third aspect, the present application further provides a computer storage medium having a computer program stored thereon, which implements the steps of any one of the above-mentioned battery balancing control methods when the computer program is executed by a processor.

[0033] One of the above technical solutions has the following advantages and beneficial effects:

[0034] The above-mentioned battery balancing control method is applied to a balancing control module, which is connected to a battery module, and the battery module includes multiple battery modules. The battery balancing control method includes the following steps: after switching from a passive balancing mode to an active balancing mode, acquiring collected data of the battery module, and when the collected data meets a preset balancing trigger condition, actively balancing the battery module to obtain a target battery module; detecting the balancing state of each target battery module in the target battery module, and determining the target battery module whose balancing state meets the preset balancing state condition as an abnormal battery module, wherein the target battery module is a battery module in the target battery module that has undergone active balancing. In this way, the present application can realize active balancing control of the battery module and identify abnormal battery modules by switching from a passive balancing mode to an active balancing mode. The present application judges the collected data of the battery module obtained after switching to the active balancing mode, and controls the battery module to perform active balancing when the preset balancing trigger conditions are met. This can enable a battery energy storage system that only has passive balancing to obtain active balancing capabilities, thereby improving the balancing effect and balancing efficiency of the battery module. In addition, by judging the balancing status of each target battery module, the target battery module that meets the preset balancing status conditions is determined to be an abnormal battery module, thereby realizing automatic selection of abnormal battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the application environment of the battery balancing control method in an embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of a first flow chart of a battery balancing control method according to an embodiment of the present application;

[0037] Figure 3 This is a flow chart of the data format conversion step in the embodiment of the present application;

[0038] Figure 4 This is a flowchart of the battery abnormality identification step in an embodiment of the present application;

[0039] Figure 5 This is a first structural diagram of a battery balancing control system in an embodiment of the present application;

[0040] Figure 6 This is a second structural diagram of the battery balancing control system in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Additionally, the term "plurality" shall mean two or more.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application 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.

[0045] The battery balancing control method provided in this application can be applied to Figure 1 In the application environment shown, the balancing control module 100 is connected to the battery module 200. After switching from the passive balancing mode to the active balancing mode, the balancing control module 100 can acquire collected data from the battery module 200. When the collected data meets the preset balancing trigger condition, the battery module 200 is actively balanced to obtain a target battery module. The balancing state of each target battery module in the target battery module is detected, and a target battery module whose balancing state meets the preset balancing state condition is determined as an abnormal battery module. The target battery module is a battery module in the target battery module that has undergone active balancing.

[0046] Exemplarily, the balancing control module 100 is applied to a battery energy storage system, which includes a battery module 200; the battery energy storage system may be a lithium battery energy storage system. In addition to configuring a balancing circuit for the battery module 200 that can implement a passive balancing function, the battery energy storage system also configures a balancing circuit for the battery module 200 that can implement an active balancing function. The balancing control module 100 may include a control module and a switch assembly. The control module connects the controlled end of the switch assembly to a data collection point (voltage, current, or temperature collection point) of the battery module 200. The switch assembly is controlled by the battery module 200 and is disposed in the balancing circuit of the battery module 200 that implements active and passive balancing functions, and is used to control the on / off of the balancing circuit of the battery module 200 that implements active and passive balancing functions. The control module can be used to collect data collected from the battery module 200 and can also be used to control the on / off of the switch assembly to select between a passive balancing mode and an active balancing mode. The control module may include a controller and a memory. The control module is connected to the memory, and the memory can be used to store information such as collected data and balancing status. The control module may further include a display, which may display information such as collected data and balancing status through a graphical interface.

[0047] In one embodiment, Figure 2 As shown, a battery balancing control method is also provided, which is applied to a balancing control module, the balancing control module is connected to a battery module, and the battery module includes multiple battery modules; the battery balancing control method includes the following steps:

[0048] Step S210: After switching from the passive balancing mode to the active balancing mode, the collected data of the battery module is obtained. When the collected data meets the preset balancing trigger condition, the battery module is actively balanced to obtain a target battery module.

[0049] The battery module may be a lithium battery module. For example, the battery energy storage system may include a battery compartment, in which a battery module is arranged. The battery module may be composed of a plurality of battery modules. Exemplarily, the battery module may be a battery pack, in which a battery module is provided with a battery box, in which a battery cell is arranged. The collected data may include voltage data of the battery module; in another example, the collected data also includes SOC (State of Charge) data and / or temperature data of the battery module. The target battery module refers to a battery module that has undergone active balancing adjustment; the preset balancing trigger condition is a trigger condition for active balancing.

[0050] For example, after switching from passive balancing mode to active balancing mode, the acquired collected data is judged. When the voltage data or SOC data of any battery module in the battery module is lower than the corresponding preset threshold, it is determined that the voltage or power of the corresponding battery module is lower than the voltage or power of the remaining battery modules in the battery module, and then the battery module is actively balanced to obtain the target battery module, thereby achieving active balancing of the battery module, and ineffective manual active balancing adjustment of the battery module, thereby improving the balancing effect and balancing efficiency of the battery module. It should be noted that the preset threshold range is determined based on the average voltage or average power of each battery module in the battery module. It should be noted that the active balancing mode and passive balancing mode mentioned in this application only represent that the circuit structure supports active balancing or passive balancing in hardware, and does not mean that balancing is being performed.

[0051] Step S220: Detect the balancing state of each target battery module in the target battery module, and determine the target battery module whose balancing state meets the preset balancing state condition as an abnormal battery module, wherein the target battery module is a battery module in the target battery module that has undergone active balancing processing.

[0052] The equilibrium state may be a charging equilibrium state or a discharging equilibrium state.

[0053] For example, after active balancing of the battery module is completed, the balancing state of the processed target battery module can be detected. According to the detection results, the balancing state of each target battery module is compared with the preset balancing state conditions. When the balancing state of the target battery module meets the preset balancing state conditions, the corresponding target battery module is determined to be an abnormal battery module, thereby realizing the identification of the abnormal battery module so that the abnormal battery module can be maintained or replaced, thereby improving the reliability and service life of the battery module.

[0054] In the above-mentioned embodiment, after switching from the passive balancing mode to the active balancing mode, the collected data of the battery module is obtained, and when the collected data meets the preset balancing trigger condition, the battery module is actively balanced to obtain the target battery module; the balancing state of each target battery module in the target battery module is detected, and the target battery module whose balancing state meets the preset balancing state condition is determined as an abnormal battery module, thereby realizing active balancing control of the battery module and identifying the abnormal battery module at the same time. The present application judges the collected data of the battery module, and controls the battery module to perform active balancing when the preset balancing trigger condition is met, so that the battery energy storage system with only passive balancing can obtain active balancing capability, thereby improving the balancing effect and balancing efficiency of the battery; in addition, by judging the balancing state of each target battery module, the target battery module that meets the preset balancing state condition is determined as an abnormal battery module, thereby realizing automatic selection of abnormal battery modules.

[0055] In one embodiment, the balancing control module includes a first balancing control module and a second balancing control module. The first balancing control module is used to connect the battery modules; the second balancing control module is used to connect the first balancing control module and the battery modules.

[0056] The first balancing control module is used to connect each battery module, and the second balancing control module is used to connect each battery module, and the second balancing control module is connected to the first balancing control module. The first balancing control module can be used to perform passive balancing on the battery modules; the second balancing control module can be used to perform active balancing on the battery modules. It should be noted that passive balancing refers to the use of discharge resistors to consume the electrical energy of the higher-voltage battery modules in the form of heat energy, so that the voltage of all battery modules reaches the same level. Active balancing refers to the redistribution of charge within the battery modules, transferring the charge of the high-energy battery modules to the low-energy battery modules, thereby achieving active balancing.

[0057] For example, Figure 3 As shown, the battery balancing control method provided by this application also includes:

[0058] Step S310: Based on the preset format of the first equalization control module, format conversion processing is performed on the collected data obtained in the active equalization mode to obtain converted collected data.

[0059] The preset format refers to the data transmission format of the first balancing control module.

[0060] The second balancing control module can obtain the preset format of the first balancing control module, and perform format conversion processing on the collected data of the detected battery modules based on the preset format of the first balancing control module, thereby obtaining converted collected data.

[0061] Step S320: Transmit the converted collected data to the first balancing control module, so that the first balancing control module controls each battery module to charge or discharge.

[0062] The second balancing control module converts the format of the collected data so that the converted collected data has the same format as the data uploaded by the first balancing control module, thereby achieving a camouflage effect. The second balancing control module then transmits the converted collected data to the first balancing control module, so that the first balancing control module controls the charging or discharging of each battery module, thereby achieving normal control of the charging and discharging operations of the battery module without affecting the normal operation of the battery module and improving the reliability of the battery energy storage system.

[0063] In one embodiment, switching from the passive balancing mode to the active balancing mode includes:

[0064] When the time for the battery module to finish discharging meets the preset time, the second balancing control module is connected to the first balancing control module and each battery module respectively, and the connection between the first balancing control module and each battery module is disconnected.

[0065] The preset time may be a time period from half an hour after the battery module is discharged to before charging.

[0066] For example, when the time when the battery module discharge ends meets the preset time, the acquisition wiring harness between the first balancing control module and each battery module can be unplugged, thereby disconnecting the connection between the first balancing control module and each battery module. Then, the second balancing control module is connected to the first balancing control module and each battery module, thereby switching the battery module to the second balancing control module with active balancing function. For another example, the second balancing control module can detect the time when the battery module discharge ends. When the time when the battery module discharge ends meets the preset time, the second balancing control module is connected to the first balancing control module and each battery module, and the connection between the first balancing control module and each battery module is disconnected, thereby automatically switching the second balancing control module on and off.

[0067] In one example, when the battery energy storage system is initially operating, the communication line between each battery module and the first balancing control module is connected by default, that is, when the battery module needs to be balanced, the battery energy storage system starts the passive balancing mode by default. When the temperature and voltage of any battery module are detected to be abnormal (such as the temperature of the corresponding battery module is higher than the preset temperature threshold and the voltage is lower than the average voltage of the battery module), the active balancing mode is switched on, and the communication lines between each battery module, the second balancing control module and the first balancing control module are connected. Then, the second balancing control module collects the collected data of the corresponding battery module, and when the collected data meets the preset balancing trigger condition, the battery module is actively balanced to obtain the target battery module, so that the battery energy storage system with only passive balancing obtains active balancing capability, thereby improving the balancing effect and balancing efficiency of the battery; the second balancing control module can also perform format conversion processing on the received collected data based on the preset format of the first balancing control module, so that the converted collected data is the same as the data format uploaded by the first balancing control module to achieve a camouflage effect, and then transmit the converted collected data to the first balancing control module to achieve normal control of the charging and discharging operations of the battery module without affecting the normal operation of the battery module.

[0068] In one example, the first balancing control module includes a first master control unit and multiple first slave control units; the second balancing control module includes a second master control unit and multiple second slave control units; the first master control unit is connected to each first slave control unit, and each first slave control unit is used to connect to each battery module in a one-to-one correspondence; the second master control unit is respectively connected to the first master control unit and each second slave control unit, and each second slave control unit is used to connect to each battery module in a one-to-one correspondence. For example, when the battery energy storage system is initially operating, the communication lines between the battery modules, the first slave control units, and the first master control unit are connected by default. That is, when the battery modules need to be balanced, the battery energy storage system defaults to passive balancing mode. When the temperature and voltage of the battery module are detected to be abnormal (for example, the temperature of the corresponding battery module is higher than the preset temperature threshold and the voltage is lower than the average voltage of the battery module), the active balancing mode is switched on, and the communication lines between the battery module, the second slave control unit, the second master control unit and the first master control unit are connected. Then, the second slave control unit collects the collected data of the corresponding battery module and transmits the collected data to the second master control unit. The second master control unit processes the received collected data. When the collected data meets the preset balancing trigger condition, the battery module is actively balanced to obtain the target battery module, so that the battery energy storage system with only passive balancing can obtain active balancing capability, thereby improving the balancing effect on the battery. and balancing efficiency; the second main control unit can also detect the balancing state of each target battery module in the target battery module, and when the balancing state of the target battery module meets the preset balancing state condition, the target battery module is determined to be an abnormal battery module, thereby realizing automatic identification of abnormal battery modules; in addition, the second main control unit can also perform format conversion processing on the received collected data based on the preset format of the first slave control unit, so that the converted collected data has the same format as the data uploaded by the first slave control unit to achieve a camouflage effect, and then transmit the converted collected data to the first main control unit to realize normal control of the charge and discharge operations of the battery module, without affecting the normal operation of the battery module, thereby improving the reliability of the battery energy storage system.

[0069] After the balancing process of the battery module is completed, the connection between the battery module and the second slave control unit is cut off, and the communication lines between the battery module, the first slave control unit and the first master control unit are connected to restore the original communication lines of the battery energy storage system, that is, restore the passive balancing function of the battery module in the battery energy storage system.

[0070] It should be noted that when switching the balancing mode of the battery energy storage system, the acquisition harness between the corresponding battery module and the original slave control module can be unplugged, and the battery module can be connected to the corresponding second slave control unit. The second slave control unit is connected to the second master control unit, and the second master control unit is connected to the first master control unit, thereby connecting the communication lines between the battery module, the second slave control unit, the second master control unit and the first master control unit. In another example, a switching unit connected to the corresponding battery module can also be provided. The switching unit is used to connect the first slave control unit or the second slave control unit. When the switching unit is connected to the second slave control unit, the communication lines between the battery module, the second slave control unit, the second master control unit and the first master control unit are connected to start the master balancing mode; when the switching unit is connected to the first slave control unit, the communication lines between the battery module, the first slave control unit and the first master control unit are connected to start the passive balancing mode.

[0071] In one embodiment, the battery balancing control method provided by the present application further includes:

[0072] Repair or replace the abnormal battery module; when the abnormal battery module is repaired or replaced, exit the active balancing mode to enter the passive balancing mode.

[0073] After identifying abnormalities in each target battery module, the identified abnormal battery modules are repaired or replaced to improve the reliability and service life of the battery modules in the battery energy storage system. When the abnormal battery module is repaired or replaced, the overall balancing operation of the battery module is determined to be complete, and the active balancing mode is then exited to enter the passive balancing mode, achieving the switching of the battery module balancing mode and improving the balancing effect and efficiency of the battery module.

[0074] In one embodiment, exiting the active balancing mode includes disconnecting the second balancing control module from the first balancing control module and each battery module, and entering the passive balancing mode includes establishing a connection between the first balancing control module and each battery module.

[0075] For example, after the abnormality identification of each target battery module in the target battery module is completed, the identified abnormal battery module is repaired or replaced to improve the reliability and service life of the battery module in the battery energy storage system. When the abnormal battery module is repaired or replaced, it is determined that the overall balancing operation of the battery module is completed, and then the acquisition harness between the second balancing control module and each battery module is unplugged, the connection between the second balancing control module and each battery module is disconnected, and then the first balancing control module is connected to each battery module, and then the communication line of the first balancing control module is restored, that is, the passive balancing mode of the battery energy storage system is restored. For another example, when the abnormal battery module is repaired or replaced, the connection between the first balancing control module and each battery module can be turned on and off by the switching unit, and the connection between the second balancing control module and each battery module can be disconnected, so as to realize automatic switching of the second balancing control module and the first balancing control module, so as to realize active balancing capability in the battery energy storage system that only has passive balancing, and further improve the balancing effect and balancing efficiency of the battery module.

[0076] In one embodiment, the collected data includes the voltage values ​​of each battery module; the preset balancing trigger condition includes a target difference corresponding to any battery module falling outside a preset voltage error range, wherein the target difference is the difference between the voltage value corresponding to the battery module and the average voltage value of each battery module. Active balancing of the battery module includes: performing active balancing on the battery modules whose corresponding voltage difference falls outside the preset voltage error range to bring the difference within the preset voltage error range.

[0077] The preset voltage error range can be obtained according to the system preset. The second balancing control module can analyze the acquired data to obtain the voltage value of each battery module; the second balancing control module averages the voltage values ​​to obtain the average voltage value corresponding to each battery module.

[0078] For example, the second balancing control module can adopt a bottom-aligned active balancing method to subtract the voltage value of any battery module from the average voltage value to obtain the target difference of the corresponding battery module. When the target difference falls outside the preset voltage error range, it is determined that the voltage of the corresponding battery module is too low, and then the corresponding battery module is actively balanced until the target difference of each battery module falls within the preset voltage error range, and the active balancing operation of the battery module is terminated, so that the battery energy storage system with only passive balancing can obtain active balancing capability, thereby improving the balancing effect and balancing efficiency of the battery module.

[0079] In one embodiment, the battery balancing control method provided in the present application further includes, after executing the step of actively balancing the battery module, entering a full-time balancing working state, and executing the step of detecting the balancing status of each target battery module in the target battery module in the full-time balancing working state.

[0080] Among them, the full-time balancing working state refers to the balancing state of the balancing strategy that is dynamically adjusted by real-time monitoring of parameters such as voltage, temperature and SOC of each battery module in the battery module and combining historical collected data.

[0081] For example, after the battery module completes the active balancing operation, it enters the full-time balancing working state and runs for a preset time (such as 3 days) based on the full-time balancing working state. Then, in the full-time balancing working state, the target battery module is monitored in real time to monitor the balancing status of the target battery module in the target battery module, so as to determine whether the corresponding target battery module is abnormal based on the balancing status of the target battery module, thereby realizing automatic identification of the abnormal status of the battery module.

[0082] In one embodiment, Figure 4 As shown, detecting the balancing state of each target battery module in the target battery module and determining the target battery module whose balancing state meets the preset balancing state condition as an abnormal battery module includes:

[0083] Step S410: If it is detected within a first preset time that the balancing state of the target battery module includes charging balancing and discharging balancing, the corresponding target battery module is determined to be an abnormal battery module.

[0084] The first preset time period refers to the battery module's full-time balancing operation. Recharge balancing monitors the charge status of each battery module to ensure even charging across all modules, preventing overcharging of some modules and thus extending the battery module's service life and overall performance. Discharge balancing monitors the discharge status of each battery module to ensure even discharge across all modules and prevent premature depletion of some modules, thereby extending the battery module's service life.

[0085] When the target battery module is in the full-time balancing working state, the balancing state of each target battery module is detected and recorded. If it is detected within the first preset time that the balancing state of the target battery module includes both charging balancing and discharging balancing, the corresponding target battery module is determined to be a low-capacity battery module, and then the corresponding target battery module is determined to be an abnormal battery module, thereby realizing automatic identification of abnormal battery modules in the battery module so that the target battery module identified as abnormal can be repaired or replaced.

[0086] Step S420: If the balancing state of the target battery module is detected to be discharge balancing within the second preset time, the corresponding target battery module is determined to be an abnormal battery module.

[0087] The second preset time may be shorter than or equal to the first preset time.

[0088] For example, when the target battery module is in a full-time balancing working state, the balancing state of each target battery module is detected and recorded. If the balancing state of the target battery module is detected as discharge balancing within the second preset time, that is, the overall continuous charging balancing of the system, the self-discharge of the corresponding target battery module is determined to be abnormal, and then the corresponding target battery module is determined to be an abnormal battery module, thereby realizing automatic identification of abnormal battery modules in the battery module, so that the target battery module identified as abnormal can be repaired or replaced.

[0089] It should be understood that although Figures 2 to 4 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figures 2 to 4 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0090] In one embodiment, a battery balancing control device is provided, comprising:

[0091] The active balancing processing unit is used to obtain the collected data of the battery module after switching from the passive balancing mode to the active balancing mode, and when the collected data meets the preset balancing trigger condition, perform active balancing processing on the battery module to obtain the target battery module.

[0092] The abnormality identification unit is used to detect the balancing state of each target battery module in the target battery module, and determine the target battery module whose balancing state meets the preset balancing state condition as an abnormal battery module, wherein the target battery module is a battery module in the target battery module that has undergone active balancing processing.

[0093] The specific definition of the battery balancing control device can be found in the definition of the battery balancing control method above and will not be repeated here. Each module in the above-mentioned battery balancing control device can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the balancing control module in the battery balancing control system in hardware form, or can be stored in the memory of the battery balancing control system in software form, so that the processor can call and execute the corresponding operations of each of the above modules.

[0094] In one embodiment, Figure 1 As shown, a battery balancing control system is also provided, including a balancing control module 100 and a battery module 200, wherein the balancing control module 100 is connected to the battery module 200; the balancing control module 100 is used to execute the steps of any one of the above battery balancing control methods.

[0095] For detailed description of the balancing control module 100 and the battery module 200 , please refer to the description of the above embodiment, which will not be repeated here.

[0096] Based on the connection between the balancing control module 100 and the battery module 200, after the balancing control module 100 switches from the passive balancing mode to the active balancing mode, the collected data of the battery module 200 is obtained. When the collected data meets the preset balancing trigger condition, the battery module 200 is actively balanced to obtain the target battery module; the balancing state of each target battery module in the target battery module is detected, and the target battery module whose balancing state meets the preset balancing state condition is determined as an abnormal battery module, wherein the target battery module is a battery module in the target battery module that has undergone active balancing, thereby realizing active balancing control of the battery module and identifying the abnormal battery module. The present application judges the collected data of the battery module 200, and controls the battery module 200 to perform active balancing when the preset balancing trigger condition is met, so that the battery energy storage system with only passive balancing can obtain active balancing capability, thereby improving the balancing effect and balancing efficiency of the battery module; in addition, by judging the balancing state of each target battery module, the target battery module that meets the preset balancing state condition is determined as an abnormal battery module, thereby realizing automatic selection of abnormal battery modules.

[0097] In one embodiment, Figure 5 As shown, the balancing control module 100 includes a first balancing control module 110 and a second balancing control module 120. The battery module 200 includes multiple battery modules 210. The first balancing control module 110 is used to connect the battery modules 210. The second balancing control module 120 is used to connect the first balancing control module 110 and the battery modules 210. The second balancing control module 120 is used to execute the steps of any one of the above-mentioned battery balancing control methods.

[0098] The first balancing control module 110 has a passive balancing function, and the second balancing control module 120 has an active balancing function. The battery module 210 may be a lithium battery module 210 .

[0099] For example, when the battery energy storage system is initially working, the communication line between each battery module 210 and the first balancing control module 110 is connected by default. When it is necessary to perform balancing on each battery module 210, the battery energy storage system starts the passive balancing mode by default. When the temperature and voltage of any battery module 210 are detected to be abnormal, the active balancing mode is switched on, and the communication lines between each battery module 210, the second balancing control module 120 and the first balancing control module 110 are connected. Then, the second balancing control module 120 collects the collected data of the corresponding battery module 210, and when the collected data meets the preset balancing trigger condition, it performs active balancing on each battery module 210 to obtain the target battery module, so that the battery energy storage system with only passive balancing obtains active balancing capability, thereby improving the balancing effect and efficiency of the battery; the second balancing control module 120 also controls the target battery module 210 by The balancing state of each target battery module in the battery module is judged, and the target battery module that meets the preset balancing state condition is determined to be an abnormal battery module, thereby realizing automatic selection of abnormal battery modules; the second balancing control module 120 can also perform format conversion processing on the received collected data based on the preset format of the first balancing control module 110, so that the format of the collected data after conversion is the same as the data format uploaded by the first balancing control module 110, so as to achieve a camouflage effect, and then transmit the converted collected data to the first balancing control module 110, so as to realize normal control of the charging and discharging operations of the battery module 200 without affecting the normal operation of the battery module 200.

[0100] In one embodiment, Figure 6 As shown, the first balancing control module 110 includes a first master control unit 114 and a plurality of first slave control units 112 corresponding to the plurality of battery modules 210; the second balancing control module 120 includes a second master control unit 124 and a plurality of second slave control units 122 corresponding to the plurality of battery modules 210; the first master control unit 114 is connected to each of the first slave control units 112, and the first slave control units 112 are used to be detachably connected to each of the battery modules 210; the second master control unit 124 is respectively connected to the first master control unit 114 and each of the second slave control units 122, and the second slave control units 122 are used to be detachably connected to each of the battery modules 210.

[0101] The second slave control unit 122 and the corresponding battery module 210 can be connected via a first adapter harness, one end of which can be fixedly connected to the second slave control unit 122, while the other end of the first adapter harness can be detachably connected to the corresponding battery module 210 via a plug-in method. Similarly, the first slave control unit 112 and the corresponding battery module 210 can be connected via a second adapter harness, one end of which can be fixedly connected to the first slave control unit 112, while the other end of the second adapter harness can be detachably connected to the corresponding battery module 210 via a plug-in method. This facilitates the connection and replacement of the first balancing control module 110 and the second balancing control module 120, so that the collection points of the first slave control unit 112 correspond to the collection points of the second slave control unit 122. It should be noted that the second slave control unit 122 has the basic data monitoring, collection and communication capabilities of a conventional slave control unit, and has active balancing capabilities, and can receive active balancing instructions from the second master control unit 124.

[0102] For example, when the battery energy storage system is initially working, the communication lines between the battery module 210, the first slave control unit 112 and the first master control unit 114 are connected by default. When the temperature and voltage of the battery module 210 are detected to be abnormal, the active balancing mode is switched on, and the communication lines between the battery module 210, the second slave control unit 122, the second master control unit 124 and the first master control unit 114 are connected. Then, the second slave control unit 122 collects the collected data of the corresponding battery module 210 and transmits the collected data to the second master control unit 124. The second master control unit 124 processes the received collected data. When the collected data meets the preset balancing trigger condition, the battery module 200 is actively balanced to obtain the target battery module, so that The battery energy storage system that only has passive balancing obtains active balancing capability, which improves the balancing effect and balancing efficiency of the battery; the second master control unit 124 can also perform format conversion processing on the received collected data based on the preset format of the first slave control unit 112, so that the converted collected data has the same format as the data uploaded by the first slave control unit 112 to achieve a camouflage effect, and then transmit the converted collected data to the first master control unit 114 to realize normal control of the charging and discharging operations of the battery module 200 without affecting the normal operation of the battery module 200, thereby improving the reliability of the battery energy storage system. The second master control unit 124 can also detect the balancing state of each target battery module in the target battery module, and when the balancing state of the target battery module meets the preset balancing state condition, determine the target battery module as an abnormal battery module, thereby realizing automatic identification of abnormal battery modules; after completing the balancing process of the battery module 200, the connection between the battery module 210 and the second slave control unit 122 is cut off, and the communication line between the battery module 210, the first slave control unit 112 and the first master control unit 114 is connected, thereby restoring the original communication line of the battery energy storage system, that is, restoring the passive balancing function of the battery module 200 in the battery energy storage system.

[0103] In one embodiment, a computer storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the above-mentioned battery balancing control methods are implemented.

[0104] For example, when a computer program is executed by a processor, it performs the following steps:

[0105] After switching from passive balancing mode to active balancing mode, the collected data of the battery module is obtained. When the collected data meets the preset balancing trigger conditions, the battery module is actively balanced to obtain a target battery module; the balancing state of each target battery module in the target battery module is detected, and the target battery module whose balancing state meets the preset balancing state conditions is determined as an abnormal battery module, wherein the target battery module is a battery module in the target battery module that has undergone active balancing.

[0106] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program. 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 division operation methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0107] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery balancing control method, characterized in that: Applied to a balancing control module, the balancing control module is connected to a battery module, and the battery module includes multiple battery modules; the battery balancing control method includes the following steps: After switching from the passive balancing mode to the active balancing mode, acquiring the collected data of the battery module, and when the collected data meets the preset balancing trigger condition, performing active balancing processing on the battery module to obtain a target battery module; Detecting the balancing state of each target battery module in the target battery module, and determining the target battery module whose balancing state meets a preset balancing state condition as an abnormal battery module, wherein the target battery module is the battery module in the target battery module that has undergone active balancing processing.

2. The battery balancing control method according to claim 1, wherein: The balancing control module includes a first balancing control module, and the first balancing control module is used to connect the battery modules; the method further includes: Based on a preset format of the first balancing control module, performing format conversion processing on the collected data obtained in the active balancing mode to obtain converted collected data; The converted collected data is transmitted to the first balancing control module, so that the first balancing control module controls each of the battery modules to charge or discharge.

3. The battery balancing control method according to claim 2, wherein: The balancing control module further includes a second balancing control module, and the second balancing control module is used to connect the first balancing control module and each of the battery modules; The switching from the passive balancing mode to the active balancing mode includes: When the time when the discharge of the battery module ends meets the preset time, the second balancing control module is connected to the first balancing control module and each of the battery modules respectively, and the connection between the first balancing control module and each of the battery modules is disconnected.

4. The battery balancing control method according to claim 3, wherein: The method further comprises: Repair or replace the abnormal battery module; When the abnormal battery module is repaired or replaced, the active balancing mode is exited to enter the passive balancing mode.

5. The battery balancing control method according to claim 4, wherein: Exiting the active balancing mode includes: disconnecting the second balancing control module from the first balancing control module and each of the battery modules; The entering the passive balancing mode includes: establishing a connection between the first balancing control module and each of the battery modules.

6. The battery balancing control method according to claim 2, wherein: The collected data includes the voltage value of each battery module; The preset balancing trigger condition includes that a target difference value corresponding to any one of the battery modules falls outside a preset voltage error range, wherein: the target difference value is the difference between the voltage value corresponding to the battery module and the average value of the voltage values ​​of the battery modules; The active balancing process for the battery modules includes: performing active balancing process on the battery modules whose corresponding voltage differences fall outside the preset voltage error range so that the voltage differences fall within the preset voltage error range.

7. The battery balancing control method according to any one of claims 2 to 6, characterized in that: The method further includes, after executing the step of actively balancing the battery module, entering a full-time balancing working state, and executing the step of detecting the balancing state of each target battery module in the target battery module in the full-time balancing working state.

8. The battery balancing control method according to claim 7, wherein: The detecting the balancing state of each target battery module in the target battery module and determining the target battery module whose balancing state satisfies a preset balancing state condition as an abnormal battery module includes: If it is detected within a first preset time that the balancing state of the target battery module includes charging balancing and discharging balancing, the corresponding target battery module is determined to be the abnormal battery module; If it is detected within the second preset time that the balancing state of the target battery module is discharge balancing, the corresponding target battery module is determined to be the abnormal battery module.

9. A battery balancing control system, characterized in that: It includes a balancing control module and a battery module, wherein the balancing control module is connected to the battery module; The balancing control module is used to execute the steps of the battery balancing control method according to any one of claims 1 to 8.

10. The battery balancing control system according to claim 9, characterized in that: The balancing control module includes a first balancing control module and a second balancing control module. The battery module includes a plurality of battery modules. The first balancing control module is used to connect the battery modules. The second balancing control module is used to connect the first balancing control module and the battery modules. The second balancing control module is configured to execute the steps of the battery balancing control method according to any one of claims 1 to 8.

11. The battery balancing control system according to claim 10, characterized in that: The first balancing control module includes a first master control unit and a plurality of first slave control units corresponding to the plurality of battery modules; the second balancing control module includes a second master control unit and a plurality of second slave control units corresponding to the plurality of battery modules; The first master control unit is connected to each of the first slave control units, and the first slave control unit is used to be detachably connected to the corresponding battery module; The second master control unit is connected to the first master control unit and each of the second slave control units respectively, and the second slave control unit is used to be detachably connected to the corresponding battery module.

12. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery balancing control method according to any one of claims 1 to 8 are implemented.

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