Battery pack series-parallel connection identification method, electronic equipment and storage medium thereof

Abstract

The invention discloses a battery pack series-parallel connection identification method, electronic equipment and a storage medium thereof, and the method comprises the steps: selecting a current battery pack according to a preset sequence, executing a pre-charging operation, and then closing a switching device of the current battery pack; starting the heating function of the target battery j, and collecting the bus voltage of the target battery j and the battery cell total voltage of the current battery pack n in real time; closing the heating function of the target battery pack j after data acquisition is completed; according to the numerical value relation, the series-parallel connection relation between the target battery pack and the current battery pack is judged; if so, switching on a switching device of the battery pack; and if the relation is determined to be the series relation, selecting the next battery pack as the current battery pack according to a preset sequence, and repeatedly executing the previous steps until all the battery packs complete relation identification and switch control. Through the mode, the series-parallel connection relation of each battery pack can be accurately identified under the condition that the circuit cost and the additional safety risk are not increased, and the problem that the connection error of a user is difficult to check is solved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of battery pack management, and in particular to a battery pack series-parallel identification method, an electronic device, and a storage medium thereof. Background Art

[0002] In the portable energy storage market, energy storage products are already fixed and mature solution design products. In order to meet the requirements of high-power equipment, a high-voltage battery system composed of series-connected battery cells has been derived. In order to extend the battery life, such as the UPS energy storage system, an expansion system with parallel battery modules has been derived. These two types of products both play their own advantages. However, for certain demand scenarios, it is necessary to adapt to the voltage platform of the electrical equipment by connecting battery modules in series, and to take advantage of the expansion of battery modules. The current market lacks safe, reliable and flexible battery module solutions that allow users to freely form series and parallel usage scenarios. Therefore, in order to better meet customer needs, energy storage systems that can support series and parallel identification, management and control will gradually become the mainstream of the market.

[0003] Because the calculation of battery SOC, voltage, current, and other data, as well as the control logic for parallel control and battery protection schemes, differ when using battery packs in series and parallel, few battery packs on the market can automatically identify the series and parallel relationships between battery modules. Manual assembly is typically required to ensure that the series and parallel connections are connected as required. However, freely connecting series and parallel modules can lead to errors when using a large number of battery modules, requiring users to spend a considerable amount of time to verify correct connections to ensure normal system operation.

[0004] An existing automatic identification method is to connect the positive pole of each battery pack cell to the negative pole of the system (i.e., the negative pole of the terminal battery pack cell) through an additional anti-reverse module and then an additional physical interface, and detect the voltage of the positive pole of the cell relative to the negative pole of the system to determine the series position of the battery pack. The circuit is more complicated and the cost is increased. It also increases the risk of direct short circuit between the positive and negative poles of the cell when the anti-reverse module fails. In addition, when the battery packs are fully connected in parallel, there is no need to rely on this module for additional identification, which only increases the safety risk. Summary of the Invention

[0005] The main technical problem solved by the embodiments of the present invention is to provide a battery pack series-parallel identification method, an electronic device and a storage medium thereof, which can solve at least some of the defects of the existing battery pack series-parallel identification scheme.

[0006] In a first aspect, an embodiment of the present invention provides a battery pack series-parallel identification method, which is applied to an energy storage system including a plurality of battery packs, comprising: S1, selecting the current battery pack in a preset order; n, close its switch device after performing the pre-charge operation; S2, start the target battery pack j Heating function, and real-time acquisition of target battery pack j Bus voltage PackV j And the total cell pressure of the current battery pack BatV n ; After data collection is completed, turn off the target battery pack j Heating function; S3, according to the bus voltage PackV j The total voltage of the battery cell BatV n The numerical relationship of the target battery pack is determined j With the current battery pack n The series-parallel relationship between them; S4, for the battery packs determined to be in parallel relationship j , close its switch device; S5, for the battery packs determined to be in a series relationship, select the next battery pack as the current battery pack according to the preset order, and repeat steps S1-S4 until all battery packs complete relationship identification and switch control.

[0007] Optionally, before step S1, the method further includes: addressing the plurality of battery packs based on a serial connection sequence of the communication link; the sequence is an addressing sequence.

[0008] Optionally, the preset order is from large to small, and the target battery pack in step S2 j For the 1st to n - 1 battery pack of either

[0009] Optionally, the preset order is from small to large, and the target battery pack in step S2 j For the n+1 To N Any one of the battery packs, N is the total number of battery packs.

[0010] Optionally, the step S3 includes: if PackV j ≤ 1 / 2 BatV n , then determine the target battery pack j With the current battery pack n There is a series relationship between them; if PackV j >1 / 2 BatV n , then determine the target battery pack j With the current battery pack n There is a parallel relationship between them.

[0011] Optionally, when the energy storage system is in a charging activation state, step S3 includes: If all target battery packs meet PackV j >1 / 2 BatV n , then the data acquired in step S2 also includes acquiring the system current of any determined parallel battery pack group or series battery pack; the system current is the absolute value of the difference between the charging current and the discharging current of each battery pack in the parallel battery pack group or the series battery pack; if the system current is 0, then the target battery pack is determined to be j With the current battery pack n If the system current is not 0, the target battery pack is determined to be j With the current battery pack n There is a series relationship between them.

[0012] Optionally, obtaining the system current of any determined series battery pack includes: collecting a first charging current of the determined series battery pack; collecting a first discharging current of the determined series battery pack; and obtaining the system current based on the first charging current and the first discharging current.

[0013] Optionally, obtaining the system current of any determined parallel battery pack group includes: collecting the second charging current of each battery pack in the determined parallel battery pack group; obtaining the total charging current based on each second charging current; collecting the second discharging current of each battery pack in the determined parallel battery pack group; obtaining the total discharging current based on each second discharging current; and obtaining the system current based on the total charging current and the total discharging current.

[0014] In a second aspect, an embodiment of the present invention provides an electronic device, comprising: at least one processor; at least one network interface, the network interface being communicatively connected to the corresponding processor; and a memory being communicatively connected to the at least one processor; wherein the network interface is used to establish a communication connection between the processor and other external devices; the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor so that the at least one processor can execute the battery pack series-parallel identification method as described in the first aspect.

[0015] In a third aspect, an embodiment of the present invention provides a non-volatile computer storage medium, which stores computer-executable instructions. The computer-executable instructions are executed by one or more processors, enabling one or more processors to execute the battery pack series-parallel identification method as described in the first aspect.

[0016] The beneficial effects of the embodiments of the present invention are as follows: Different from the existing technology, the embodiments of the present invention can accurately identify the series and parallel relationship of each battery pack without increasing the cost of the battery pack circuit and additional safety risks, facilitating the system to perform corresponding battery data calculation, pack control and protection scheme and other control logic, solving the problem that it is difficult for users to check series and parallel connection errors, and can also accurately identify when the energy storage system is in the charging activation state, meeting the complex working conditions required by users. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 An energy storage system including a plurality of battery packs is provided in an embodiment of the present invention; Figure 2 1 is a flow chart of a method for identifying series and parallel connections of battery packs provided by an embodiment of the present invention; Figure 3 It is a circuit diagram of several battery packs connected in series; Figure 4 It is a circuit diagram of several battery packs connected in parallel; Figure 5 It is a circuit diagram of several battery packs connected in series and parallel; Figure 6 It is a circuit diagram of several battery packs connected in series and parallel in an energy storage system in a charging activation state; Figure 7 yes Figure 2 Another sub-process diagram of step S400 is shown; Figure 8 It is a schematic diagram of the current loop formed by connecting the target battery pack in parallel with the current battery pack; Figure 9 It is a schematic diagram of the current loop formed by connecting the target battery pack in series with the current battery pack; Figure 10 It is a structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "inner", "outer", "bottom" and the like used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0021] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0022] The technical solution in this application will be described below with reference to the accompanying drawings.

[0023] In some embodiments of the present application, Figure 1 As shown, an energy storage system comprising several battery packs is provided. The system consists of multiple independent battery packs (Battery Pack 1 to Battery Pack N), connected in series and parallel. Each battery pack is connected to a common power busbar via a dedicated switching device (such as the MOSFET in the figure), enabling flexible activation and deactivation of the battery pack and fault isolation. When the MOSFET is disconnected, the battery pack is isolated from the power busbar, preventing the pack's voltage and current from being output. When the MOSFET is closed, the battery pack is connected to the power busbar. The system is equipped with a busbar voltage / current detection module to monitor the voltage and output current of each battery pack in real time to ensure safe operation. To address low-temperature environments, each battery pack has an integrated independent heating circuit. The heating resistor (such as R1 for Battery Pack 1) is controlled by a dedicated resistor switch (such as K1), enabling independent activation and deactivation of the heating function based on the individual pack's temperature requirements. This architecture achieves capacity expansion and reliability through parallel connection and redundancy, while extending battery life by forming a high-voltage system through series connection. It also supports on-demand management, making it suitable for electric vehicles or energy storage systems with stringent environmental adaptability and safety requirements.

[0024] For example Figure 1 The energy storage system shown in the figure provides a method for identifying battery packs in series and parallel. Figure 2 1 is a flow chart of a battery pack series-parallel identification method provided by an embodiment of the present invention.

[0025] Specifically, if Figure 2 As shown, the battery pack series and parallel identification method includes the following steps: Step S100: addressing a plurality of battery packs based on the serial connection order of the communication link.

[0026] Specifically, according to the connection sequence of the communication ports, the signals of the upstream and downstream ports of the battery pack are detected. If there is a signal on the upstream port, it means there is a battery pack before this battery pack, and if there is a signal on the downstream port, it means there is a battery pack after this battery pack. If there is no signal on the upstream port but there is a signal on the downstream port, it is the first pack (i.e., battery pack 1). Battery pack 1 sends address 1 through the CAN bus. After the addressing of the first pack is completed, the addressing signal is turned on and the next pack starts addressing. If it is detected that there are signals on both the upstream and downstream ports, the address is sent to battery pack 2 and the addressing signal is turned on; the next battery pack is addressed to battery pack 3; each battery pack is addressed in sequence, and the last battery pack has a signal on the upstream port but no signal on the downstream port, and is addressed to battery pack 1. N .

[0027] In some other embodiments, the order may also be determined according to the physical location, communication address or other identification of the battery pack, to ensure that each battery pack can be processed in a predictable order.

[0028] Step S200: Select the current battery pack according to the preset order n , and then close its switching device after performing the pre-charge operation.

[0029] Before this step, all the switch devices in the battery pack are in the off state. Each battery pack has a pre-charge circuit ( Figure 1 (not shown in the figure), the pre-charge circuit may include a pre-charge resistor and a pre-charge control switch. When the pre-charge operation is started, the pre-charge control switch is closed, and the battery pack provides energy, outputting voltage / current to the outside at a low power, so that the current passes through the pre-charge resistor to charge the bus capacitor of the energy storage system. The resistance value of the pre-charge resistor is usually large, which can effectively limit the charging current, prevent large current shocks when the voltage difference is large, and protect the battery pack and system components. The pre-charge process will continue for a period of time until the bus voltage rises to a level close to the battery pack voltage, achieving potential balance between the battery pack and the bus, thereby ensuring that the battery pack can be safely connected to the system.

[0030] After pre-charging is complete, the voltage difference between the battery pack and the energy storage system busbar is minimal, allowing the switch to be safely closed, completing the electrical connection between the battery pack and the system. In some embodiments of the present application, the switch is typically a power electronic switching device, such as a MOS tube or relay, capable of withstanding high currents and exhibiting low on-resistance.

[0031] The preset order may be an addressing order. When the preset order is from large to small, the addressing order is from the first N Starting with the first battery pack, the pre-charge operation is performed and then the switch device (MOS tube) is closed. If the preset order is from small to large, it starts with the first battery pack, the pre-charge operation is performed and then the switch device (MOS tube) is closed.

[0032] Step S300: Start the target battery pack j Heating function, and real-time acquisition of target battery pack j Bus voltage PackV j And the total cell pressure of the current battery pack BatV n ; After data collection is completed, turn off the target battery pack j Heating function.

[0033] After closing the switch of the current battery pack, the total cell voltage of the current battery pack can be obtained. BatV n This value will be used as a reference for subsequent judgment of the series and parallel relationship between other battery packs and this battery pack. BatV n For the current battery pack n The total voltage difference between the positive and negative terminals is the actual output voltage of the battery pack, excluding external line voltage drops. In some embodiments of the present application, the total cell voltage is typically collected through a voltage sampling circuit built into the BMS (Battery Management System). This circuit has high precision and good anti-interference performance, and can accurately reflect the actual voltage status of the battery pack.

[0034] The purpose of this application is to determine the series and parallel relationship between all battery packs in the energy storage system. When a battery pack is selected as the current battery pack, the remaining battery packs with unclosed switch devices are all identified as objects to be determined. If the preset order is from large to small, the target battery pack j For the 1st to n -Any one of 1 battery packs. For example: The current battery pack is N , then the target battery pack j For the 1st to N-1 battery pack. If the preset order is from small to large, the target battery pack j Just for the n+1 To N For example, if the current battery pack is 1, then the target battery pack j For the 2nd to 3rd N Any one of the battery packs.

[0035] It should be noted that the heating function mainly uses the heating circuit of the battery pack itself to control the temperature within a safe range. On the one hand, in addition to the battery pack, other devices are usually connected to the energy storage system, such as Figure 1 The inverter (PCS) shown has capacitors on the bus. After charging, the capacitors maintain their voltage. However, during shutdown, the capacitors may not fully discharge, resulting in a virtual voltage on the external bus. Activating the heating function quickly discharges any external capacitor voltage, and the detected bus voltage is the actual voltage. When the heating function is enabled, current flows through the heating resistor, creating a specific current path. The primary purpose of the heating circuit isn't to raise the battery temperature, but rather to use the heating resistor as a load with a known resistance value to create a specific current path, facilitating subsequent determination of the series and parallel relationships between battery packs. The heating process is strictly controlled to ensure that the battery pack temperature remains within a safe range, preventing potential safety hazards caused by overheating.

[0036] like Figure 1 As shown, each battery pack has a bus voltage / current detection unit, which is usually integrated into the BMS. j The corresponding heating function can accurately collect the bus voltage of the battery pack. The bus voltage refers to the voltage between the external terminals of the battery pack. In some embodiments of the present application, the bus voltage is the target battery pack. j Its corresponding switching device (MOS tube j ) consists of a series structure consisting of a battery pack j The total voltage of the battery cell and the voltage drop of the external circuit. Figure 1 As shown, the bus voltage detected by battery pack 1 PackV 1 is the voltage between points C1 and C2, and the bus voltage detected by battery pack 2 PackV 2 is also the voltage between C1 and C2; the bus voltage detected by battery pack 3 PackV 3 is the voltage between points C2 and C3, and the bus voltage detected by battery pack 4 PackV 4 is also the voltage between points C2 and C3; and so on, the bus voltage detected by battery pack N-1 is PackV N-1 CN-1 with C N The voltage between two points.

[0037] As an example and not a limitation, the energy storage system records the collected bus voltage values ​​of each target battery pack in the memory of the BMS to provide data support for the subsequent series-parallel relationship judgment. In some embodiments of the present application, the recording process may include filtering, averaging or other signal processing operations on the original sampled data to improve the accuracy and reliability of the data. By recording the bus voltage values ​​of multiple battery packs, the system can establish a complete voltage distribution diagram, providing a sufficient data basis for judging the connection relationship between battery packs. The recording of bus voltage can also be used for system status monitoring and fault diagnosis to improve the operational safety of the entire energy storage system.

[0038] Step S400: According to the bus voltage PackV j The total voltage of the battery cell BatV n The numerical relationship of the target battery pack is determined j With the current battery pack n The series-parallel relationship between them.

[0039] For battery packs connected in series, since the switch device of the target battery pack is not closed, it is equivalent to the electrical circuit being disconnected. In theory, the bus voltage of the target battery pack is close to 0, but due to external virtual pressure or leakage in the electrical circuit, in practice, even if the switch device is not closed, its bus voltage will not be 0. For battery packs connected in parallel, since the switch device of the current battery pack is closed, detecting the bus voltage of the target battery pack is equivalent to detecting the bus voltage of the current battery pack. Due to line loss, the bus voltage of the current battery pack is generally less than the total cell voltage. It is worth noting that the specific judgment threshold may be adjusted appropriately according to the characteristics of the energy storage system and the battery parameters to improve the judgment accuracy. With respect to the cell characteristics of lithium-ion batteries, when the voltage reaches half of the full charge, it is considered to be severely over-discharged, which will cause cell damage. In order to unify the standard, half of the total cell voltage of the current battery pack is used as the judgment threshold in this embodiment.

[0040] Under certain working conditions (such as when the energy storage system is in a static state), the connection mode between battery packs can be determined by comparing the relationship between the bus voltage of the target battery pack and the total cell voltage of the current battery pack. PackV j Less than or equal to the total cell voltage BatV n Half of the time ( PackV j ≤ 1 / 2 BatV n), it can be determined that the target battery pack and the current battery pack are in series relationship; when the bus voltage PackV j When it is greater than half of the total voltage of the battery cell ( PackV j >1 / 2 BatV n ), it can be determined that the target battery pack and the current battery pack are in parallel relationship.

[0041] Under certain operating conditions (such as when the energy storage system is in a charging activation state), the connection method between battery packs can be determined by comparing the bus voltage of the target battery pack with the total cell voltage of the current battery pack, and judging the system current.

[0042] For all battery packs with unclosed switch devices, if both PackV j ≤ 1 / 2 BatV n The target battery pack also meets PackV j >1 / 2 BatV n The target battery pack is determined to meet PackV j ≤ 1 / 2 BatV n Condition target battery pack j With the current battery pack n There is a series relationship between them, and it is determined that PackV j >1 / 2 BatV n Condition target battery pack j With the current battery pack n For example, the total number of battery packs is 12, and the preset order is from large to small. The current battery pack is 9, so the target battery pack (which is also the battery pack with unclosed switch devices) is battery pack 1-8. It is now determined that battery packs 1, 2, 3, 4, 5, and 6 meet PackV j ≤ 1 / 2 BatV n , battery pack 7,8 meets PackV j >1 / 2 BatV n , it can be directly determined that battery packs 1, 2, 3, 4, 5, 6 and battery pack 9 are in a series relationship, and battery packs 7, 8 and battery pack 9 are in a parallel relationship.

[0043] For all battery packs with unclosed switch devices, if all target battery packs meet PackV j >1 / 2 BatVn , then the data acquired in step S2 also includes acquiring the system current of any determined parallel battery pack group or series battery pack; the system current is the absolute value of the difference between the charging current and the discharging current of each battery pack in the parallel battery pack group or the series battery pack; if the system current is 0, then the target battery pack is determined to be j With the current battery pack n If the system current is not 0, the target battery pack is determined to be j With the current battery pack n For example, the total number of battery packs is 12, and the current battery pack is 6 according to the preset order from largest to smallest. According to the previous recognition results, the parallel battery pack groups are (12, 11) and (9, 8, 7), and the two parallel battery pack groups are connected in series with battery pack 10. The target battery pack (which is also the battery pack with unclosed switching devices) is battery pack 1-5. It is now determined that battery packs 1, 2, 3, 4, and 5 all meet the requirements. PackV j >1 / 2 BatV n Therefore, it is also necessary to obtain the system current of any determined parallel or series battery pack (i.e., any of the system currents of battery packs (12, 11), battery packs (9, 8, 7), and battery pack 10). If the system current is 0 when the heating function of battery pack 5 is activated, then battery packs 4 and 6 are determined to be in a parallel relationship; if the system current is not 0 when the heating function of battery pack 3 is activated, then battery packs 3 and 6 are determined to be in a series relationship.

[0044] Among them, obtaining the system current of any determined series battery pack includes: collecting the first charging current of the determined series battery pack; collecting the first discharging current of the determined series battery pack; and obtaining the system current based on the first charging current and the first discharging current.

[0045] Among them, obtaining the system current of any determined parallel battery pack group includes: collecting the second charging current of each battery pack in the determined parallel battery pack group; obtaining the total charging current based on each second charging current; collecting the second discharging current of each battery pack in the determined parallel battery pack group; obtaining the total discharging current based on each second discharging current; and obtaining the system current based on the total charging current and the total discharging current.

[0046] In some embodiments of the present application, the identification results of series and parallel connections are recorded in the memory of the energy storage system. The recording process not only includes simple status marks, but may also include auxiliary information such as relevant voltage values ​​and timestamps to facilitate subsequent queries and verifications. The recording of parallel relationships is crucial for subsequent battery management. The energy storage system will adjust the current distribution strategy, balancing control algorithm, and protection parameters accordingly to ensure that the parallel battery packs can work together to avoid problems such as overcharge, overdischarge, or uneven cycling. The record of the series relationship also includes necessary additional information to provide the energy storage system with complete connection topology data. The identification of series relationships is particularly important for high-voltage battery systems. The energy storage system will adjust the total voltage monitoring, charge and discharge management, and fault protection functions according to the series connection situation to ensure that each series battery pack operates within a safe range and avoid system safety hazards caused by excessive stress on a single battery pack.

[0047] Step S500: For the battery packs determined to be in parallel j , then close its switch device.

[0048] It is worth noting that when it is judged to be a parallel relationship, the switching device (MOS tube) can be directly closed, because the voltages between parallel battery packs are similar and no large current shock will be generated.

[0049] Step S600: For the battery packs determined to be in a series relationship, the next battery pack is selected as the current battery pack according to a preset sequence, and steps S200 to S500 are repeated until all battery packs have completed relationship identification and switch control.

[0050] When it is determined to be a series relationship, it is necessary to further perform the above steps and perform pre-charging and judgment in a preset order.

[0051] It's easy to understand that the above steps are repeated until all the switches in all battery packs are closed. By looping through this process, the connection relationships between all battery packs can be determined sequentially, ultimately forming a complete battery pack connection topology diagram, providing basic information for subsequent battery management.

[0052] Specifically, after completing each round of steps S200 to S400, the energy storage system checks whether there are still battery packs with their switches in the off state. If so, the next round of iteration is continued; if not, it indicates that the switches of all battery packs have been closed, and the identification process is complete.

[0053] By way of example and not limitation, the battery pack series-parallel identification method can be executed during the initial power-up of the energy storage system or after a system restart, ensuring that the battery pack connection relationship is identified before normal operation. Furthermore, the method can also be triggered when a change in the battery pack connection is detected.

[0054] In summary, the battery pack series-parallel identification method provided in this application cleverly utilizes the pre-charging circuit and heating function of existing battery packs, combined with voltage relationship judgment, to achieve automatic identification of battery pack connection relationships without adding additional hardware costs and safety risks. This method can accurately identify complex series-parallel combinations, provide accurate topology information for energy storage systems, and thus optimize the efficiency and safety of battery packs.

[0055] The above contents are further explained below with reference to specific figures. Figure 3 The following is a circuit diagram showing several battery packs connected in series: Specifically, if Figure 3 As shown, the circuit includes N battery packs connected in series, namely battery pack 1 to battery pack N. Each battery pack is connected in series with a switch device (MOS transistor 1 to MOS transistor N in the figure). The heating circuit corresponding to each battery pack is not shown in the figure. As an example and not a limitation, each battery pack and its corresponding switch device constitute a series unit, and these series units are connected in series in sequence to form the entire energy storage system. It is worth noting that C1 to C N+1 The key connection points in the circuit are identified, which are used to measure and judge the bus voltage of each battery pack.

[0056] It is not difficult to understand that in the series connection mode, the bus voltage detection of battery pack 1 actually measures the voltage between points C1 and C2 ( PackV 1) The bus voltage detection of battery pack 2 actually measures the voltage between points C2 and C3 ( PackV 2), and so on, the battery pack N The bus voltage detection actually measures C N and C N+1 The voltage between two points ( PackV N The total cell voltage (BatV) of each battery pack is the voltage between the positive and negative electrodes of the battery pack cells.

[0057] When the system executes step S300 in the preset order, it is assumed that battery pack N has completed pre-charging and closed its MOS tube N, becoming the current battery pack. The energy storage system will then start the heating function for the remaining battery packs one by one and measure their bus voltages. For example, it will heat battery pack N-1 and measure its bus voltage. PackV N-1 (i.e. C N-1 with C N Since in the case of series connection, C N-1 with C NThe voltage between them is mainly affected by the total voltage of the battery pack N-1, and because the MOS tube N-1 is in the disconnected state, when comparing PackV N-1 Total cell voltage of battery pack N BatV N When there is a one-half relationship, there will usually be: PackV N-1 < 1 / 2 BatV N In some embodiments of the present application, based on the aforementioned voltage relationship, the energy storage system can determine that battery pack N-1 is connected in series with battery pack N and record this result. If a similar determination is made for all battery packs with unclosed switching devices and all meet the aforementioned conditions, it can be confirmed that all battery packs are connected in series.

[0058] Figure 4 The following diagram shows a circuit diagram of several battery packs connected in parallel when the energy storage system is in a static state. Specifically, if Figure 4 As shown, the circuit includes N parallel-connected battery packs, battery packs 1 through N. Each battery pack is connected in series with a switching device (MOSFETs 1 through N in the figure). The corresponding heating circuits for each battery pack are not shown. As an example and not a limitation, in the parallel connection mode, the positive terminals of all battery packs are connected together, and the negative terminals of all battery packs are also connected together, forming two common connection busbars. It is worth noting that in the parallel configuration, C1 and C2 identify the key connection points in the circuit, which are connected to the positive and negative terminals of all battery packs, respectively.

[0059] It is not difficult to understand that in the parallel connection mode, the bus voltage detection of all battery packs actually measures the voltage between the same pair of points (C1 and C2). Due to the characteristics of the parallel connection, when a battery pack (for example, battery pack N) completes pre-charging and closes its switch device (MOS tube N), the voltage between C1 and C2 will be mainly determined by the total voltage of the battery cells in the battery pack. Therefore, the bus voltage detection value ( PackV 1 to PackV N-1 ) will be very close to the total cell voltage of battery pack N ( BatV N ).

[0060] When the energy storage system executes step S300 in a preset order, it is assumed that battery pack N has completed pre-charging and closed its switch device (MOS tube N), becoming the current battery pack. The energy storage system will then start the heating function for the remaining battery packs (battery pack 1 to battery pack N-1) one by one and measure their bus voltages. Since in the case of parallel connection, the voltage between C1 and C2 is mainly provided by the turned-on battery pack N, when comparing the bus voltage PackV of any battery pack with the total cell voltage BatV of battery pack N. N When there is a one-half relationship, there will usually be: PackV> 1 / 2 BatV N In some embodiments of the present application, based on the aforementioned voltage relationship, the energy storage system can determine that each battery pack is connected in parallel with battery pack N and record this result. If a similar determination is made for all battery packs with unclosed switching devices and all meet the aforementioned conditions, it can be determined that all battery packs are connected in parallel.

[0061] Figure 5 The following diagram shows a circuit diagram of a mixed series-parallel connection of several battery packs when the energy storage system is in a static state. Specifically, if Figure 5 The figure shows a more complex battery pack connection method, namely a hybrid series-parallel connection. As an example and not a limitation, battery pack 1 and battery pack 2 form a parallel group, battery pack 3 and battery pack 4 form another parallel group, and so on. Battery pack N-1 and battery pack N form another parallel group, and these parallel groups are connected in series. Each battery pack is connected in series with a switching device (MOS transistors 1 to MOS transistors N in the figure) to control the connection and disconnection of the battery pack. It is worth noting that in the hybrid connection structure, the layout of the bus voltage detection points also changes accordingly. The figure shows measurement points such as "Battery Pack 1 / 2 Bus Voltage Detection", "Battery Pack 3 / 4 Bus Voltage Detection", and "Battery Pack N-1 / N Bus Voltage Detection".

[0062] It's easy to understand that in a mixed series-parallel connection, the energy storage system needs to identify the connection relationships between each battery pack step by step. As a specific example, assume that the energy storage system first completes pre-charging of battery pack N in a preset sequence and closes its switch (MOSFET N), becoming the current battery pack. When the energy storage system is in a static state, the heating function can be activated simultaneously for all battery packs with open switches, while simultaneously measuring their bus voltages.

[0063] In some embodiments of the present application, since battery pack N-1 is connected in parallel with battery pack N, the bus voltage of battery pack N-1 is PackV N-1Will meet the conditions: PackV N-1 >1 / 2 BatV N The other parallel groups (such as battery pack 1, 2, battery pack 3, 4, ....) and battery pack N The parallel groups are connected in series, and their bus voltages will satisfy the conditions: PackV ≤ 1 / 2 BatV N As a further example, as the energy storage system continues to identify battery packs in a pre-set sequence, it closes the switch for battery pack N-1, then precharges the next battery pack with the largest address (e.g., battery pack N-2) and closes its switch. At this point, the energy storage system again checks the bus voltages of the remaining battery packs whose switches remain open to determine their relationship to the new current battery pack (battery pack N-2). This progressive process ultimately identifies the exact connection relationships between all battery packs.

[0064] Figure 6 The following diagram shows a circuit diagram of several battery packs connected in series and parallel when the energy storage system is in the charging active state: Specifically, if Figure 6 As shown, the circuit structure is Figure 5 Similar, but the entire energy storage system has an inflow of external energy, and the voltage of the external energy inflow is PackV chg As an example and not a limitation, in the figure, battery pack 1 and battery pack 2 form a parallel group, battery pack 3 and battery pack 4 form another parallel group, ..., battery pack N-1 and battery pack N form another parallel group, and these parallel groups are connected in series. The corresponding heating circuits of each battery pack are not shown in the figure. 3,.... C N-1 ,C N The key connection points in the circuit are marked for voltage measurement and current path analysis.

[0065] It is not difficult to understand that when the energy storage system is in the charging activation state, the external charging voltage PackV chg The existence of will interfere with the series-parallel identification method based on voltage relationship. As an example and not a limitation, assume that the battery pack N is pre-charged and its switch device is closed in the preset order, and the battery pack N-1 meets PackV N-1 > 1 / 2 BatV N , other battery packs meet PackV ≤ 1 / 2 BatVN Close the switch of battery pack N-1 and continue to judge battery packs 1 to N-2 according to the above steps. Similarly, when the energy storage system continues to precharge battery pack 4 in the preset order and closes its switches, it is necessary to judge the connection relationship between the remaining battery packs (battery packs 1, 2, and 3) and battery pack 4.

[0066] In the embodiment of the present application, the key problem is that: the battery pack 1 and the battery pack 2 are PackV chg If the charging voltage exists, it will be added between C2 and C1 through the loop shown by the red line in the figure. PackV chg Along the red line, voltage is applied between C2 and C1 through the closed MOS transistors N, N-1, and MOS transistor 4, affecting the bus voltage measurement values ​​of battery pack 1 and battery pack 2.

[0067] As a more detailed explanation, in this case, the bus voltages PackV1 and PackV2 of battery pack 1 and battery pack 2 satisfy the following relationship:

[0068] in, It represents the sum of the bus voltages of all battery packs with closed switching devices. M represents that there are M series relationships, including the series relationship between parallel battery pack groups. For each parallel battery pack group, the bus voltage of a battery pack group is calculated only once, for example, the battery pack N With battery pack N-1 Calculate one group and calculate the bus voltage only once PackV N .

[0069] If at this time PackV chg If the voltage is high enough, even if battery packs 1, 2 and battery pack 4 are actually in series, the measured PackV2 and PackV1 may be greater than half of the total cell voltage BatV4 of battery pack 4, causing the energy storage system to be mistakenly judged as a parallel relationship.

[0070] By way of example and not limitation, Figure 6 As shown, when MOS4 is turned on in the preset order, battery pack 3 meets the condition PackV3 > 1 / 2 BatV4, but this does not confirm that it is in parallel with battery pack 4. Similarly, the bus voltages of battery packs 1 and 2 may also meet the same condition, but in fact they may be in series with battery pack 4, which creates a contradiction in judgment.

[0071] As a further example, in order to solve the above problem, a new judgment logic needs to be introduced. When the energy storage system is in the charging activation state, if the bus voltage of the battery packs of all unclosed switch devices meets the parallel conditions, the system needs to perform additional verification. Figure 7 The judgment process shown is as follows: the actual connection relationship is determined by heating the battery pack and detecting the system current.

[0072] In some other embodiments of the present application, step S400 specifically includes the following steps, and its flowchart is as follows: Figure 7 As shown: Step S410: Determine the target battery pack j Bus voltage PackV j Is it larger than the current battery pack? n Total cell voltage BatV n One half of .

[0073] By comparing the size relationship between the two, we can preliminarily determine the connection method between the battery packs.

[0074] Step S420, if PackV j ≤ 1 / 2 BatV n , the target battery pack can be directly determined j With the current battery pack n There is a series relationship between them.

[0075] Step S430: If PackV j >1 / 2 BatV n , then the system current of any determined parallel battery pack group or series battery pack is obtained.

[0076] In the charging activation state, due to the interference of external charging source, relying solely on voltage comparison may lead to misjudgment. Figure 6 As shown, when there is an external charging voltage PackV chg Even if the target battery pack and the current battery pack are actually in series, the measured bus voltage may still meet the parallel judgment condition because the charging voltage is transmitted through the closed switch device and the path marked by the red line. PackV j >1 / 2 BatV n , which requires further verification.

[0077] when PackV j >1 / 2 BatV nWhen the battery pack is heated, the energy storage system measures the system current through the heating circuit of the battery pack with the heating function activated to further verify the actual connection relationship. In some embodiments of the present application, the system current refers to the absolute value of the difference between the charging current and the discharging current of each battery pack in a parallel battery pack group or a series battery pack.

[0078] Specifically, the system current is calculated as:

[0079] in, m Indicates the m parallel battery packs, l Indicates the m In the group l Battery packs are connected in parallel; I m_i For parallel battery packs m Middle i The charging current of each battery pack, DsI m_i For parallel battery packs m Middle i The discharge current of a battery pack.

[0080] For a single series battery pack (not connected in parallel with other battery packs), the above formula also applies, the only difference is that, l =1.

[0081] It is not difficult to understand that the acquisition of system current needs to be completed through the current sampling circuit in the battery management system, which can accurately measure the charging and discharging current of the battery pack.

[0082] Step S440: If the system current is 0, determine the target battery pack j With the current battery pack n There is a parallel relationship between them.

[0083] like Figure 8 As shown, the current battery pack is battery pack 4, the target battery pack is battery pack 3, and the heating function of battery pack 3 is activated. When the target battery pack 3 and the current battery pack 4 are connected in parallel, a loop shown by the red line is formed. The current flows from the positive electrode of battery pack 4 through the heating resistor R3 and then through MOS4 back to the negative electrode of battery pack 4. At this time, only battery pack 4 will have current passing through, and the current detected by other battery packs in series with battery pack 4 is 0, so the system current is 0.

[0084] Subsequently, the energy storage system records the judgment results of the parallel relationship in the memory, providing a basis for subsequent battery management and control.

[0085] Step S450: If the system current is not 0, determine the target battery pack jWith the current battery pack n There is a series relationship between them.

[0086] like Figure 9 As shown, the current battery pack is battery pack 4, the target battery pack is battery pack 2, and the heating function of battery pack 2 is activated. When the target battery pack 2 and the current battery pack 4 are in series, a loop shown by the red line will be formed, that is, all battery packs with closed switching devices will have current passing through. The current of any group of battery packs that have been determined to be connected in series or battery pack group m in parallel is not zero, so the system current is not zero.

[0087] The series connection records are also stored in the battery management system, providing key information for subsequent high-voltage management, charge and discharge control, and protection strategies. Accurate identification of series connections is particularly important for preventing overcharge and overdischarge of individual battery packs, thereby improving the safety and reliability of the entire energy storage system.

[0088] In some embodiments of the present application, Figure 8 The following diagram shows the current loop formed by connecting the target battery pack in parallel with the current battery pack: Specifically, if Figure 8 As shown, it contains a complex structure of multiple battery packs connected in parallel in series, and there is an external charging voltage PackV chg The red line in the diagram specifically illustrates the heating current loop formed when the current battery pack and the target battery pack are connected in parallel. It's worth noting that the diagram specifically shows the heating circuit for the target battery pack, with "heating resistor R3" indicating that the heating function of battery pack 3 is activated; the heating function of the other battery packs is not yet shown.

[0089] When the system is in the charging activation state, if it is initially determined that battery pack 3 and battery pack 4 may be in a parallel relationship ( PackV 3>1 / 2 BatV 4), the energy storage system will further obtain the system current for verification. In some embodiments of the present application, if battery pack 3 and battery pack 4 are indeed connected in parallel, after the heating function of battery pack 3 is activated, a current loop will be formed as shown by the red line in the figure: the current starts from the positive electrode of battery pack 4, passes through heating resistor R3, and then returns to the negative electrode of battery pack 4 through MOS transistor 4.

[0090] In this case, the heating current is provided entirely by battery pack 4. The loop only includes the heating resistor of battery pack 3 and battery pack 4, without involving other battery packs or an external charging source. Therefore, the system current detected by all other battery packs with closed switches (e.g., battery packs 5, 6, ..., N-1, N) is zero. This is because, in the parallel state, current takes the path of least impedance, a locally closed loop, and does not flow through other battery packs connected in series.

[0091] In some embodiments of the present application, this feature provides a reliable basis for determining true series-parallel relationships. When the energy storage system detects that the system current is zero, it can confirm that the target battery pack being heated is in parallel with the current battery pack with the closed switch, thus avoiding the misjudgment that may result from relying solely on voltage comparison.

[0092] In some embodiments of the present application, Figure 9 The following diagram shows the current loop formed by the target battery pack and the current battery pack in series: Specifically, if Figure 9 As shown, the circuit structure is Figure 8 The diagram is similar, but the current path indicated by the red line is significantly different. As an example and not a limitation, the diagram shows the target battery pack's "heating resistor R2," indicating that the heating function of battery pack 2 has been activated. It's worth noting that the diagram illustrates the heating current loop formed when the battery packs are connected in series.

[0093] It is easy to understand that when the energy storage system is in the charging activation state, if it is initially determined that battery pack 2 and battery pack 4 may be in a parallel relationship (based on PackV 2>1 / 2 BatV 4, but in reality, this determination is inaccurate due to interference from the external charging source. The system will further obtain system current for verification. In some embodiments of the present application, if battery packs 2 and 4 are actually connected in series, a current loop will be formed as shown by the red line in the figure: the current originates from the external charging source, passes through the parallel connection of battery packs N-1 and N, ..., then flows through the parallel connection of battery packs 3 and 4, then passes through heating resistor R2 of battery pack 2, and finally returns to the charging source, forming a large closed loop.

[0094] As an example and not a limitation, in this case, the heating current is provided by an external charging source, and the current path includes all battery packs with closed switches. Therefore, all battery packs with closed switches (such as battery packs 3, 4, ..., N-1, N) will detect a non-zero system current. Specifically, the heating current I Heat Equal to system current SysI m , that is: I Heat =SysIm ≠ 0.

[0095] In some embodiments of the present application, this feature provides a reliable basis for determining true series-parallel relationships. When the energy storage system detects that the system current is not zero, it can confirm that the target battery pack is in series with the current battery pack with the closed switch, thereby correcting the misjudgment that may result from relying solely on voltage comparison.

[0096] In some other embodiments of the present application, obtaining the system current of any determined series-connected battery pack specifically includes the following steps: Step S4311: Collect the first charging current of the battery pack that has been determined to be connected in series.

[0097] This step involves measuring the charging current of the battery packs that have been identified and recorded as being in a series relationship. Charging current refers to the current flowing from an external power source into the battery pack when the energy storage system is in a charging state, and the direction is generally defined as flowing from the positive terminal to the negative terminal of the battery pack. In some embodiments of the present application, charging current is typically acquired by a current sensor in the battery management system, such as a Hall current sensor or sampling resistor.

[0098] As you can imagine, the current acquisition circuit is typically installed in the main current path of the battery pack, enabling real-time monitoring of current magnitude and direction. The collected charging current data is filtered, calibrated, and converted into a standard digital signal for use in the energy storage system.

[0099] Step S4312: collecting the first discharge current of the battery pack that has been determined to be connected in series.

[0100] This step measures the discharge current of battery packs that have been identified and recorded as being in a series connection. Discharge current refers to the energy flowing from the battery pack to the busbar when the battery pack is in a discharged state. This can occur in situations such as when a battery pack supplies power to a corresponding heating resistor, or when a battery pack with a higher total cell voltage in a parallel battery pack group supplies power to a battery pack with a lower total cell voltage.

[0101] Specifically, the discharge current is collected by the current sensor in the battery management system, using the same hardware as the charging current measurement. The difference is that the energy storage system determines whether the current is in the charging or discharging state based on the current direction and records it separately.

[0102] Step S4313: Obtaining a system current according to the first charging current and the first discharging current.

[0103] In some embodiments of the present application, the system current is calculated as follows: System current = |Charge current - Discharge current| It is not difficult to understand that this calculation method takes into account the situation where the battery pack may have charging and discharging currents at the same time. By taking the absolute value of the difference, the energy storage system can obtain the actual net current size of the battery pack, providing a reliable basis for judging the series and parallel relationship.

[0104] In other embodiments of the present application, the actual connection relationship between battery packs can be determined by comparing whether the system current is 0. Specifically, if the system current is 0, it indicates that the heating current has formed a local closed loop, which can be confirmed as a parallel relationship; if the system current is not 0, it indicates that the heating current flows through multiple battery packs, which can be confirmed as a series relationship.

[0105] In other embodiments of the present application, obtaining the system current of any recorded parallel battery pack group specifically includes the following steps: Step S4321: collecting the second charging current of each battery pack in the parallel battery pack group.

[0106] This step involves measuring the charging current of each battery pack in the battery pack group that has been identified and recorded as being in a parallel relationship. For a parallel battery pack group, each battery pack may have a different charging current, depending on parameters such as the internal resistance, capacity, and state of charge (SOC) of each battery pack. In some embodiments of the present application, the energy storage system collects charging current data for each battery pack using a dedicated current sensor for each battery pack.

[0107] It's easy to understand that charging current collection for each battery pack in a parallel battery pack requires a high degree of synchronization to ensure data time consistency. It's worth noting that charging current imbalances may exist between parallel battery packs. This is a normal physical phenomenon and does not affect system current calculations or the determination of series-parallel relationships. The energy storage system records the charging current values ​​of each battery pack separately to prepare for subsequent calculation of the total charging current.

[0108] Step S4322: Obtain a total charging current according to each second charging current.

[0109] This step refers to accumulating the charging currents of all battery packs in the parallel battery pack group to obtain the total charging current of the parallel group.

[0110] Specifically, because parallel battery packs share the same positive and negative terminals, Kirchhoff's current law states that the total charging current is equal to the sum of the charging currents of all individual battery packs. The energy storage system considers the direction of each pack's charging current during calculations, ensuring that the accumulated result accurately reflects the charge state of the entire parallel group.

[0111] Step S4323: collecting the second discharge current of each battery pack in the parallel battery pack group.

[0112] This step involves measuring the discharge current of each battery pack in the battery pack group that has been identified and recorded as being in a parallel relationship. In some embodiments of the present application, the discharge current is measured using the same hardware as the charging current, but the system distinguishes the current direction and records the discharge current value separately.

[0113] It is not difficult to understand that the discharge current of each battery pack in a parallel battery pack group may also be unbalanced, which is mainly caused by the difference in internal parameters of each battery pack.

[0114] Step S4324: Obtain a total discharge current according to each second discharge current.

[0115] Similar to the total charge current calculation, the total discharge current is calculated based on Kirchhoff's current law, summing the discharge currents of all battery packs. The energy storage system ensures that the current direction is correctly identified and only the current in the discharge direction is included in the calculation.

[0116] Step S4325: Obtain the system current according to the total charging current and the total discharging current.

[0117] In some embodiments of the present application, the system current is calculated as follows: System current = |Total charge current - Total discharge current| This calculation method takes into account the complex situation of parallel battery packs that may experience both charging and discharging currents simultaneously. By taking the absolute value of the difference, the energy storage system can accurately determine the net current of the parallel group, providing a reliable basis for determining the series-parallel relationship.

[0118] In other embodiments of the present application, when heating a battery pack with an unclosed switch, if the battery pack is connected in parallel with the current battery pack, the system current is zero; if they are connected in series, the system current is non-zero. This current-based judgment method is particularly suitable for situations where the energy storage system is in an active charging state and external charging interference causes inaccurate voltage judgment.

[0119] Different from the existing technology, the implementation method of the present invention can accurately identify the series and parallel relationship of each battery pack without increasing the cost of the battery pack circuit and additional safety risks, facilitating the system to perform corresponding battery data calculation, pack control and protection scheme and other control logic, solving the problem that users' series and parallel connection errors are difficult to check, and can also accurately identify them during charging activation, meeting the complex working conditions required by users.

[0120] The embodiment of the present invention also provides an electronic device based on the above-mentioned battery pack series and parallel identification method, the structural diagram of which is as follows: Figure 10 As shown, the electronic device 100 includes: One or more processors 101, network interface 102, and memory 103, Figure 10 In the figure, a processor 101, a network interface 102 and a memory 103 are taken as an example.

[0121] The network interface 102 is in communication with the corresponding processor 101, and the processor 101 and the memory 103 can be connected via a bus or other means. Figure 10 The bus connection is taken as an example.

[0122] The network interface 102 is used to establish a communication connection between the processor 101 and other external devices, and includes the following types of interfaces: RJ-45 interface, SC fiber optic interface, AUI interface, FDDI interface, and Console interface.

[0123] Memory 103, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs, and modules. Processor 101 executes the non-volatile software programs, instructions, and units stored in memory 103 to perform various functional applications and data processing of the electronic device, thereby implementing the battery pack series-parallel identification method of the above-mentioned method embodiment.

[0124] The memory 103 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and applications required for at least one function; the data storage area may store data created based on the use of the electronic device, etc. In addition, the memory 103 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 103 may optionally include a memory remotely located relative to the processor 101, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0125] The one or more units are stored in the memory 103 and, when executed by one or more processors 101 , perform the battery pack series-parallel identification method in any of the above method embodiments.

[0126] The electronic device described above can execute the battery pack series-parallel identification method provided by the embodiment of the present invention, and has the corresponding program modules and beneficial effects of executing the method. For technical details not fully described in the electronic device embodiment, please refer to the battery pack series-parallel identification method provided by the embodiment of the present invention.

[0127] Embodiments of the present invention also provide a non-volatile computer-readable storage medium. This non-volatile computer-readable storage medium may be included in the device described in the above embodiments, or may exist independently and not incorporated into the device. This non-volatile computer-readable storage medium carries one or more programs. When executed, these one or more programs implement the battery pack series-parallel identification method of the disclosed embodiment.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the idea of ​​the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack series and parallel identification method, applied to an energy storage system including several battery packs, characterized in that: include: Step A: Select the current battery pack according to the preset order n , closing its switch device after performing the pre-charge operation; Step B: Start the target battery pack j Heating function, and real-time acquisition of target battery pack j Bus voltage PackV j And current battery pack n Total cell voltage BatV n ; After data collection is completed, turn off the target battery pack j Heating function; Step C, according to the bus voltage PackV j The total voltage of the battery cell BatV n The numerical relationship of the target battery pack is determined j With the current battery pack n The series and parallel relationship between them; Step D: for the battery packs determined to be in parallel j , close its switching device; In step E, for the battery packs determined to be in a series relationship, the next battery pack is selected as the current battery pack according to a preset sequence, and steps AD are repeated until all battery packs have completed relationship identification and switch control.

2. The method according to claim 1, wherein the plurality of battery packs are communicatively connected via a communication link, wherein: Before step A, the method further includes: addressing the plurality of battery packs based on the serial connection sequence of the communication link; the sequence is the addressing sequence.

3. The method according to claim 1, characterized in that The preset order is from large to small, and the target battery pack in step B j For the 1st to n - 1 battery pack of either 4. The method according to claim 1, wherein The preset order is from small to large, and the target battery pack in step B j For the n+1 To N Any one of the battery packs, N is the total number of battery packs.

5. The method according to claim 1, characterized in that The step C comprises: like PackV j ≤ 1 / 2 BatV n , then determine the target battery pack j With the current battery pack n There is a series relationship between them; like PackV j > 1 / 2 BatV n , then determine the target battery pack j With the current battery pack n There is a parallel relationship between them.

6. The method according to claim 1, characterized in that When the energy storage system is in a charging activation state, step C further includes: If all target battery packs meet PackV j > 1 / 2 BatV n , then the data obtained in step B also includes obtaining the system current of any determined parallel battery pack group or series battery pack; the system current is the absolute value of the difference between the charging current and the discharging current of each battery pack in the parallel battery pack group or the series battery pack; if the system current is 0, the target battery pack is determined to be j With the current battery pack n If the system current is not 0, the target battery pack is determined to be j With the current battery pack n There is a series relationship between them.

7. The method according to claim 6, characterized in that The obtaining of the system current of any determined series-connected battery pack includes: collecting a first charging current of a battery pack determined to be connected in series; collecting a first discharge current of the battery pack determined to be connected in series; The system current is obtained according to the first charging current and the first discharging current.

8. The method according to claim 6, characterized in that The obtaining of the system current of any determined parallel battery pack group includes: collecting a second charging current of each battery pack in the battery pack group that has been determined to be connected in parallel; Obtaining a total charging current according to each of the second charging currents; collecting a second discharge current of each battery pack in the battery pack group determined to be connected in parallel; obtaining a total discharge current according to each of the second discharge currents; The system current is obtained according to the total charging current and the total discharging current.

9. An electronic device, characterized in that: include: at least one processor; at least one network interface, the network interface being communicatively connected to a corresponding processor; as well as, a memory communicatively connected to the at least one processor; wherein, The network interface is used to establish a communication connection between the processor and other external devices; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery pack series-parallel identification method as described in any one of claims 1-8.

10. A non-volatile computer storage medium, characterized in that The computer storage medium stores computer-executable instructions, which are executed by one or more processors, enabling the one or more processors to execute the battery pack series-parallel identification method as described in any one of claims 1 to 8.

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