Battery pack string parallel identification method, electronic device and storage medium thereof

Abstract

This invention discloses a battery pack series-parallel identification method, an electronic device, and its storage medium, comprising: selecting the current battery pack according to a preset order, performing a pre-charge operation, and then closing its switching device; activating the target battery. j The heating function, and real-time acquisition of target battery data. j Bus voltage and current battery pack n Total cell voltage; shut down the target battery pack after data acquisition. j The system utilizes a heating function; based on the numerical relationship between the target battery pack and the current battery pack, it determines the series-parallel connection relationship; if a parallel connection is determined, the switching device of the battery pack is closed; if a series connection is determined, the next battery pack is selected as the current battery pack according to a preset order, and the aforementioned steps are repeated until all battery packs have completed relationship identification and switching control. Through this method, the present invention can accurately identify the series-parallel connection relationship of each battery pack without increasing circuit costs or adding additional safety risks, solving the problem of users finding it difficult to check for connection errors.

Description

TECHNICAL FIELD

[0001] The embodiments of the present application relate to the field of battery pack management, and in particular to a battery pack series-parallel connection identification method, an electronic device and a storage medium thereof. BACKGROUND

[0002] In the market of portable energy storage, energy storage products have been fixed, mature solution design products. In order to meet the requirements of high-power equipment, a high-voltage system of batteries composed of series-connected battery cells is derived. In order to prolong the endurance time, such as the UPS energy storage system, a capacity expansion system derived by connecting battery modules in parallel is derived. These two types of products have their own advantages, but for certain demand scenarios, it is desired to connect battery modules in series to adapt to the voltage platform of the electrical equipment and to exert the advantages of battery module capacity expansion. At present, there is a lack of safe, reliable and flexible battery module solutions in the market that can allow users to freely set up series and parallel use scenarios. Therefore, in order to better meet the needs of customers, energy storage systems that support series-parallel connection identification and management control will gradually become the mainstream in the market.

[0003] Since the SOC, voltage, current and other data of the battery are calculated differently when the battery pack is used in series and in parallel, and the control logic of the battery protection scheme is also different, there are few battery packs on the market that can automatically identify the series-parallel connection relationship between battery modules. Basically, it is ensured that the connection is in series or parallel according to the requirements when assembled manually. However, in the case of a large number of battery modules, the user may make mistakes when freely connecting in series and parallel, and the user needs to spend a lot of time checking whether the connection is correct to ensure that the system is used normally.

[0004] An existing automatic identification method is to connect the positive electrode of each battery pack cell to the negative electrode of the system (i.e. the negative electrode of the terminal battery pack cell) through an additional anti-reverse module and an additional physical interface, to detect the voltage of the positive electrode of the battery cell relative to the negative electrode of the system to determine the series connection position of the battery pack. The circuit is more complex, which additionally increases the cost and the risk of direct short circuit of the positive and negative electrodes of the battery cell when the anti-reverse module fails. Moreover, when the battery pack is connected in parallel, the module is not needed for additional identification, but only increases the safety risk. SUMMARY

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

[0006] In a first aspect, the embodiments of the present application provide a battery pack series-parallel connection identification method applied to an energy storage system including a plurality of battery packs, comprising: S1, selecting a current battery pack according to a preset order nS2, after performing the pre-charge operation, close its switching device; S3, start the target battery pack. j The heating function, and real-time acquisition of the target battery pack. j bus voltage PackV j and the total cell voltage of the current battery pack BatV n After data acquisition is complete, shut down the target battery pack. j Heating function; S3, according to the bus voltage PackV j With the total voltage of the battery cell BatV n The numerical relationship is used to determine the target battery pack. j With the current battery pack n The series and parallel connections between them; S4, for battery packs determined to be in parallel connection. j S1, close its switching device; S5, for battery packs determined to be in series, select the next battery pack as the current battery pack according to the preset order, and repeat steps S1-S4 until all battery packs have completed relationship identification and switching control.

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

[0008] Optionally, the preset order is from largest to smallest, and the target battery pack in step S2... j For the 1st to the 1st n -1 of the battery packs.

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

[0010] Optionally, step S3 includes: if PackV j ≤ 1 / 2 BatV n Then the target battery pack is determined. j With the current battery pack n The two are in a series relationship; if PackV j >1 / 2 BatV n Then the target battery pack is determined. j With the current battery pack n They are connected in parallel.

[0011] Optionally, when the energy storage system is in the charging activation state, the step S3 comprises:

[0012] If all target battery packs satisfy PackV j >1 / 2 BatV n , the data obtained in the step S2 further comprises 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, it is determined that the target battery pack is in parallel relationship with the current battery pack; if the system current is not 0, it is determined that the target battery pack is in series relationship with the current battery pack. j n j n

[0013] Optionally, the obtaining of the system current of any determined series battery pack comprises: 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 according to the first charging current and the first discharging current.

[0014] Optionally, the obtaining of the system current of any determined parallel battery pack group comprises: collecting the second charging current of each battery pack in the determined parallel battery pack group; obtaining the total charging current according to 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 according to each second discharging current; and obtaining the system current according to the total charging current and the total discharging current.

[0015] In a second aspect, an embodiment of the present application provides an electronic device, comprising: at least one processor; at least one network interface, which is in communication connection with the corresponding processor; and a memory in communication connection with the at least one processor; wherein the network interface is configured to establish a communication connection between the processor and other external devices; and the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the battery pack series-parallel identification method as described in the first aspect.

[0016] In a third aspect, an embodiment of the present application provides a non-volatile computer storage medium, which stores computer executable instructions, and the computer executable instructions are executed by one or more processors to enable the one or more processors to execute the battery pack series-parallel identification method as described in the first aspect.

[0017] ​​​​The beneficial effect of the embodiment of the present application is that, unlike the prior art, the embodiment of the present application can accurately identify the series-parallel connection relationship of each battery pack without increasing the cost of the battery pack circuit and additional safety risks, facilitate the system to perform corresponding battery data calculation, pack control and protection scheme control logic, solve the problem that the user's series-parallel connection error is not easy to check, and can also accurately identify when the energy storage system is in a charging active state, meeting the complex working condition requirements of the user. BRIEF DESCRIPTION OF DRAWINGS

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and not intended to be limiting of the embodiments, and in which like reference numerals designate similar items in the figures, in which: the drawings do not limit the proportion.

[0019] Figure 1 is a schematic diagram of an energy storage system including a plurality of battery packs provided by the embodiment of the present application;

[0020] Figure 2 is a flowchart of a battery pack series-parallel connection identification method provided by the embodiment of the present application;

[0021] Figure 3 is a circuit schematic diagram of a plurality of battery packs connected in series;

[0022] Figure 4 is a circuit schematic diagram of a plurality of battery packs connected in parallel;

[0023] Figure 5 is a circuit schematic diagram of a plurality of battery packs connected in series-parallel;

[0024] Figure 6 is a circuit schematic diagram of a plurality of battery packs connected in series-parallel when the energy storage system is in a charging active state;

[0025] Figure 7 is Figure 2 is another sub-flowchart of the step S400 shown;

[0026] Figure 8 is a current loop schematic diagram formed by the target battery pack and the current battery pack in parallel;

[0027] Figure 9 is a current loop schematic diagram formed by the target battery pack and the current battery pack in series;

[0028] Figure 10 is a schematic diagram of the structure of an electronic device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0029] For the purpose of facilitating the understanding of the present application, the present application will be 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 "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "upper", "lower", "inner", "outer", "bottom", and the like used in the present specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0030] Unless otherwise defined, all technical and scientific terms used in the present specification have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present specification are merely for the purpose of describing specific embodiments of the present application and are not intended to limit the present application. The term "and / or" used in the present specification includes any and all combinations of one or more of the associated listed items.

[0031] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0032] The technical solutions in the present application will be described below in conjunction with the accompanying drawings.

[0033] In some embodiments of the present application, as shown in Figure 1 An energy storage system including a plurality of battery packs is provided, which is composed of a plurality of independent battery packs (battery pack 1 to battery pack N), which are connected in series and parallel between each other; each battery pack is connected to a common power bus through a dedicated switching device (such as a MOS tube in the figure), realizing flexible investment, withdrawal and fault isolation of the battery pack. After the MOS tube is opened, the battery pack is isolated from the power bus, and the voltage and current of the battery pack cannot be output; after the MOS tube is closed, the battery pack is in communication with the power bus. The system is equipped with a bus voltage / current detection module to monitor the voltage and output current of each battery pack in real time to ensure safe operation. For low temperature environment, each battery pack integrates an independent heating circuit: the heating resistor (such as R1 corresponding to battery pack 1) is controlled by a dedicated resistor switch (such as K1), and the heating function can be started and stopped independently according to the temperature requirement of the single pack. This architecture expands the capacity in parallel, improves the reliability through redundant design, and extends the endurance time by connecting in series to form a high-voltage system; at the same time, it supports on-demand management, which is suitable for scenarios with high environmental adaptability and safety requirements for electric vehicles or energy storage systems.

[0034] A battery pack string parallel identification method is provided for an energy storage system as shown in Figure 1 For ease of understanding, Figure 2 is a flowchart of the battery pack string parallel identification method provided by the embodiments of the present application.

[0035] Specifically, as shown in Figure 2 , the battery pack string parallel identification method comprises the following steps:

[0036] Step S100: Addressing a plurality of battery packs based on the serial connection order of the communication link.

[0037] Specifically, according to the connection order of the communication port, the uplink and downlink port signals of the battery pack are detected. The uplink signal represents that there is a battery pack before the current battery pack, and the downlink signal represents that there is a battery pack after the current battery pack. When the uplink port has no signal and the downlink port has a signal, it is the first pack (i.e. battery pack 1), which sends address 1 through the CAN bus. After the first pack is addressed, the addressing signal enable is turned on, and the next pack starts to be addressed. When both the uplink and downlink ports have signals, the battery pack 2 is addressed and the addressing signal enable is turned on. The next battery pack is addressed as battery pack 3. Each battery pack is sequentially addressed, and the last battery pack has an uplink signal and no downlink signal. The battery pack N .

[0038] In other embodiments, the order can also be determined according to the physical position, communication address or other identification of the battery pack, to ensure that each battery pack can be processed in a predictable order.

[0039] Step S200: Selecting the current battery pack n according to the preset order and closing its switching device after performing the pre-charging operation.

[0040] Before this step, the switching device in all battery packs is in an open state. Each battery pack has a pre-charging circuit (not shown in Figure 1 ), which can include a pre-charging resistor and a pre-charging control switch. When the pre-charging operation is started, the pre-charging control switch is closed, and the battery pack provides energy to output voltage / current at a small power, so that the current passes through the pre-charging resistor to charge the bus capacitor of the energy storage system. The pre-charging resistor usually has a large resistance value, which can effectively limit the charging current and prevent large current surges when the voltage difference is large, thereby protecting the battery pack and system components. The pre-charging process will continue for a period of time until the bus voltage rises to a level close to the voltage of the battery pack, achieving potential balance between the battery pack and the bus, and further ensuring that the battery pack can be safely connected to the system.

[0041] When the pre-charging is completed, the voltage difference between the current battery pack and the energy storage system bus is very small, at which time the switch device can be safely closed to complete the electrical connection between the battery pack and the system. In some embodiments of the present application, the switch device is usually a power electronic switch device such as a MOS tube or a relay, which can withstand a large current and has a low on-resistance.

[0042] The preset sequence can be an addressing sequence. When the preset sequence is a descending order, the pre-charging operation is performed on the first battery pack, and then the switch device (MOS tube) of the first battery pack is closed. When the preset sequence is an ascending order, the pre-charging operation is performed on the first battery pack, and then the switch device (MOS tube) of the first battery pack is closed. N

[0043] Step S300: Start the heating function of the target battery pack j , and collect the bus voltage of the target battery pack j in real time PackV j and the total voltage of the current battery pack BatV n ; after the data collection is completed, the heating function of the target battery pack j is closed.

[0044] After the switch device of the current battery pack is closed, the total voltage of the current battery pack BatV n can be obtained, which will be used as a reference for judging the series-parallel connection relationship of other battery packs with the current battery pack. The total voltage of the battery pack BatV n is the total voltage difference between the positive and negative terminals of the current battery pack n , which is the actual output voltage of the battery pack and does not include the external line voltage drop. In some embodiments of the present application, the collection of the total voltage is usually completed by the voltage sampling circuit built in the BMS (Battery Management System, battery management system), which has high precision and good anti-interference performance and can accurately reflect the actual voltage state of the battery pack.

[0045] The purpose of the present application is to judge the series-parallel connection relationship between all battery packs in the energy storage system. When a certain battery pack is selected as the current battery pack, the remaining battery packs with unclosed switch devices are all taken as the objects to be judged and are identified one by one. If the preset sequence is a descending order, the target battery pack j is any one of the first to the n -1th battery pack. For example, when the current battery pack is N , the target battery pack j is any one of the first to the N ​-1 battery pack. If the preset order is ascending, then the target battery pack... j Just for the first n+1 To the N Any one of the battery packs. For example: if the current battery pack is 1, then the target battery pack is... j For the 2nd to the 3rd N Any one of the battery packs.

[0046] It should be noted that the heating function primarily utilizes the battery pack's own heating circuitry, keeping the temperature within a safe range. On the other hand, in energy storage systems, besides the battery pack, other devices are typically connected, such as... Figure 1 The inverter (PCS) shown has capacitors on its bus. After charging, the voltage of these capacitors is maintained. When the inverter is powered off, the capacitors may not have fully discharged, resulting in a dummy voltage on the external bus. Activating the heating function quickly discharges this dummy voltage, ensuring the detected bus voltage is the true voltage. Furthermore, when the heating function is enabled, current flows through the heating resistor, creating a specific current path. The primary purpose of the heating circuit is not to increase battery temperature, but rather to utilize the heating resistor as a load with a known resistance value, creating a specific current path to provide information for determining the series and parallel connections between battery packs. The heating process is strictly controlled to ensure the battery pack temperature remains within a safe range, preventing overheating and related safety hazards.

[0047] like Figure 1 As shown, each battery pack has a bus voltage / current detection unit, typically integrated into the BMS. This is achieved by starting the target battery pack. j The corresponding heating function can accurately collect the bus voltage of the battery pack. Bus voltage refers to the voltage between the external terminals of the battery pack. In some embodiments of this application, the bus voltage is the target battery pack voltage. j Its corresponding switching device (MOSFET) j The voltage across the series structure formed by the battery pack includes the voltage across the battery pack. j The total voltage of the battery cells and the voltage drop of the external circuitry. For example... Figure 1 As shown, the bus voltage detected by battery pack 1 PackV 1 represents the voltage between points C1 and C2, and 2 represents the bus voltage detected by battery pack 2. PackV 2 is also the voltage between points C1 and C2; 3 is the bus voltage detected by the battery pack. PackV 3 represents the voltage between points C2 and C3, and 4 represents the bus voltage detected by the battery pack. PackV 4 is also the voltage between points C2 and C3; and so on, the bus voltage detected by battery pack N-1. PackV N-1 CN-1 With C N The voltage between two points.

[0048] As an example but not limitation, the energy storage system records the bus voltage values of each target battery pack collected in the memory of the BMS, providing data support for subsequent series-parallel connection judgment. In some embodiments of the present application, the recording process may include filtering, averaging or other signal processing operations on the original sampling 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 map, providing sufficient data basis for judging the connection relationship between battery packs. The recording of bus voltage can also be used for system state monitoring and fault diagnosis, improving the operation safety of the entire energy storage system.

[0049] Step S400: According to the bus voltage PackV j The numerical relationship between the total voltage of the cell BatV n The series-parallel connection relationship between the target battery pack j And the current battery pack n .

[0050] For series-connected battery packs, since the switching device of the target battery pack is not closed, the equivalent electrical circuit is disconnected, and theoretically the bus voltage of the target battery pack tends to 0, but due to external virtual voltage or possible leakage in the electrical circuit, in actual situation, even if the switching device is not closed, its bus voltage is not 0. For parallel-connected battery packs, since the switching 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, and due to line loss, the bus voltage of the current battery pack is generally less than the total voltage of the cell. 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. For the cell characteristics of lithium-ion batteries, when the voltage reaches half of the full charge, it is considered to be a serious over-discharge, which will cause damage to the cell. In order to unify the standard, half of the total voltage of the cell of the current battery pack is used as the judgment threshold in this embodiment.

[0051] In some working conditions (such as when the energy storage system is in a stationary state), by comparing the relationship between the bus voltage of the target battery pack and the total voltage of the cell of the current battery pack, the connection mode between the battery packs can be determined. When the bus voltage PackV j Is less than or equal to half of the total voltage of the cell BatV n ( PackV j ≤ 1 / 2 BatV nThis allows us to determine if the target battery pack and the current battery pack are connected in series; when the bus voltage... PackV j When the voltage is greater than half of the total cell voltage ( PackV j >1 / 2 BatV n This allows us to determine whether the target battery pack and the current battery pack are connected in parallel.

[0052] 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 relationship between the bus voltage of the target battery pack and the total cell voltage of the current battery pack, as well as by judging the system current.

[0053] For all battery packs with unclosed switching devices, if existing conditions are met... PackV j ≤ 1 / 2 BatV n The target battery pack also meets the requirements. PackV j >1 / 2 BatV n If the target battery pack meets the requirements, then it is determined that it satisfies the requirements. PackV j ≤ 1 / 2 BatV n Target battery pack under certain conditions j With the current battery pack n The two are connected in series, and the condition is satisfied. PackV j >1 / 2 BatV n Target battery pack under certain conditions j With the current battery pack n The connections are in parallel. For example, if the total number of battery packs is 12, and they are ordered from largest to smallest according to a preset sequence, and the current battery pack is 9, then the target battery packs (which are also the battery packs with unclosed switching devices) are battery packs 1-8. It is now determined that battery packs 1, 2, 3, 4, 5, and 6 satisfy... PackV j ≤ 1 / 2 BatV n Battery packs 7 and 8 meet the requirements. PackV j >1 / 2 BatV n Therefore, it can be directly determined that battery packs 1, 2, 3, 4, 5, 6 are connected in series with battery pack 9, and battery packs 7, 8 are connected in parallel with battery pack 9.

[0054] For battery packs with all unclosed switching devices, if all target battery packs meet the following requirements... PackV j >1 / 2 BatVn , the data obtained in step S2 further comprises 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, it is determined that the target battery pack j is in parallel relationship with the current battery pack n ; if the system current is not 0, it is determined that the target battery pack j is in series relationship 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, and the current battery pack is 6; according to the previous identification result, the parallel battery pack groups are (12, 11), (9, 8, 7), and the two parallel battery pack groups are in series with battery pack 10; the target battery pack (also the battery pack with the non-closed switching device) is battery pack 1-5, and it is determined that battery packs 1, 2, 3, 4, and 5 all satisfy PackV j >1 / 2 BatV n , so the system current of any determined parallel battery pack group or series battery pack (i.e. any one of the system currents of the battery pack groups (12, 11), the battery pack (9, 8, 7), and the battery pack 10) needs to be obtained. If the heating function of battery pack 5 is started, the system current is 0, it is determined that battery pack 4 is in parallel relationship with battery pack 6; if the heating function of battery pack 3 is started, the system current is not 0, it is determined that battery pack 3 is in series relationship with battery pack 6.

[0055] , the system current of any determined series battery pack is obtained, including: 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 according to the first charging current and the first discharging current.

[0056] , the system current of any determined parallel battery pack group is obtained, including: collecting the second charging current of each battery pack in the determined parallel battery pack group; obtaining the total charging current according to 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 according to each second discharging current; and obtaining the system current according to the total charging current and the total discharging current.

[0057] In some embodiments of the present application, the identification results of series-parallel connection are recorded in the memory of the energy storage system. The recording process not only includes simple state marking, but also possibly includes auxiliary information such as related voltage values and time stamps, facilitating subsequent query and verification. The record of parallel connection is crucial for subsequent battery management, and the energy storage system adjusts the current distribution strategy, equalization control algorithm and protection parameters, etc. according to the record, to ensure that the parallel battery packs can work cooperatively and avoid overcharging, over-discharging or uneven cycling problems. The record of series connection also includes necessary additional information to provide complete connection topology data for the energy storage system. The identification of series connection is particularly important for high-voltage battery systems, and the energy storage system adjusts the total voltage monitoring, charging and discharging management and fault protection functions according to the series connection, to ensure that each series battery pack works within a safe range and avoids system safety hazards caused by excessive stress on a single battery pack.

[0058] Step S500: for the battery pack determined as parallel connection, the next battery pack is selected as the current battery pack in the preset order, and steps S200-S500 are repeatedly executed until the relationship identification and switch control of all battery packs are completed. j Then, its switching device is closed.

[0059] It is worth noting that when the parallel connection is determined, its switching device (MOS tube) can be directly closed, because the voltage between the parallel battery packs is similar and will not cause a large current impact.

[0060] Step S600: for the battery pack determined as series connection, the next battery pack is selected as the current battery pack in the preset order, and steps S200-S500 are repeatedly executed until the relationship identification and switch control of all battery packs are completed.

[0061] When the series connection is determined, the aforementioned steps need to be further executed for pre-charging and determination in the preset order.

[0062] It is not difficult to understand that the above steps are repeated until the switching devices of all battery packs are in the closed state. By repeatedly executing the above process, the connection relationship between all battery packs can be determined in turn, and finally a complete battery pack connection topology structure diagram is formed, providing basic information for subsequent battery management.

[0063] Specifically, after completing each round of steps S200 to S400, the energy storage system checks whether there are still battery packs with switching devices in the open state. If so, the next round of iteration is continued; if not, it means that the switching devices of all battery packs have been closed, and the identification process is completed.

[0064] As an example but not limitation, the execution timing of the battery pack series-parallel identification method can be at the initial power-on stage of the energy storage system or after the energy storage system is restarted, to ensure that the identification of the connection relationship of the battery packs is completed before normal operation. In addition, when a change in the connection of the battery packs is detected, the execution of the method can also be triggered.

[0065] In summary, the battery pack series-parallel identification method provided by the application realizes automatic identification of the connection relationship of the battery pack by ingeniously utilizing the pre-charging circuit and heating function in the existing battery pack in combination with voltage relationship judgment, without the need to additionally increase hardware cost and safety risk. The method can accurately identify complex series-parallel combination conditions, provide accurate topology information for the energy storage system, and further optimize the use efficiency and safety of the battery pack.

[0066] The above content will be further described in combination with specific diagrams. Figure 3 The circuit schematic diagram of several battery packs connected in series is shown, and the specific description is as follows:

[0067] Specifically, as shown in Figure 3 , the circuit includes N battery packs connected in series, i.e., battery pack 1 to battery pack N, and each battery pack is connected in series with a switching device (MOS tube 1 to MOS tube N in the figure). The heating loop of each battery pack is not shown in the figure. As an example but not limitation, each battery pack and the corresponding switching device form a series unit, and these series units are connected in series to form the entire energy storage system. It is worth noting that C1 to C N+1 in the figure mark the key connection points in the circuit, which are used for measuring and judging the bus voltage of each battery pack.

[0068] It is not difficult to understand that, under the series connection mode, the bus voltage detection of battery pack 1 actually measures the voltage between C1 and C2 (V PackV 1), the bus voltage detection of battery pack 2 actually measures the voltage between C2 and C3 (V PackV 2), and so on. The bus voltage detection of battery pack N actually measures the voltage between C C N and C C N+1 . The total voltage of the battery cell of each battery pack (BatV) is the voltage between the positive electrode and the negative electrode of the battery cell. PackV N . The total voltage of the battery cell of each battery pack (BatV) is the voltage between the positive electrode and the negative electrode of the battery cell.

[0069] When the system executes step S300 according to 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 of the remaining battery packs one by one and measure the bus voltage, such as heating battery pack N-1 and measuring the bus voltage PackV N-1 between C N-1 and C N . Since C N-1 and C NThe voltage between C1 and C2 is mainly affected by the total voltage of the cells in battery pack N-1, and since MOS N-1 is in an open state, when the voltage between C1 and C2 is half of the total voltage of the cells in battery pack N, there is usually: PackV N-1 The voltage between C1 and C2 is mainly affected by the total voltage of the cells in battery pack N-1, and since MOS N-1 is in an open state, when the voltage between C1 and C2 is half of the total voltage of the cells in battery pack N, there is usually: BatV N The voltage between C1 and C2 is mainly affected by the total voltage of the cells in battery pack N-1, and since MOS N-1 is in an open state, when the voltage between C1 and C2 is half of the total voltage of the cells in battery pack N, there is usually:

[0070] PackV N-1 1 / 2 BatV N

[0071] In some embodiments of the present application, based on the above voltage relationship, the energy storage system can determine that battery pack N-1 and battery pack N are in series, and record the result. If similar judgments are made for all battery packs with open switch devices, and all satisfy the above conditions, it can be confirmed that all battery packs are connected in series.

[0072] Figure 4 The circuit schematic diagram of several battery packs connected in parallel when the energy storage system is in a static state is shown, and the specific description is as follows:

[0073] Specifically, as shown in Figure 4 , the circuit includes N battery packs connected in parallel, i.e. battery pack 1 to battery pack N, each of which is connected in series with a switch device (MOS 1 to MOS N in the figure), and the corresponding heating circuit of each battery pack is not shown in the figure. As an example but not limitation, in the parallel connection mode, the positive poles of all battery packs are connected together, and the negative poles of all battery packs are also connected together, forming two common connection buses. It is worth noting that in the parallel structure, 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.

[0074] 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 parallel connection, when a certain battery pack (for example, battery pack N) completes pre-charging and closes its switch device (MOS N), the voltage between C1 and C2 will be mainly determined by the total voltage of the cells in the battery pack. Therefore, the bus voltage detection values of all other battery packs (battery pack 1 to battery pack N-1) PackV 1 to PackV N-1 will be very close to the total voltage of the cells in battery pack N BatV N .

[0075] ​When the energy storage system executes step S300 in the preset order, it is assumed that battery pack N has completed pre-charging and closed its switching device (MOS tube N), becoming the current battery pack. The energy storage system then performs the start-up heating function on the remaining battery packs (battery pack 1 to battery pack N-1) one by one and measures their bus voltages. Since in the parallel connection case, the voltage between C1 and C2 is mainly provided by the battery pack N that has been turned on, when comparing the bus voltage PackV of any battery pack with half of the total voltage BatV of the battery pack N N

[0076] PackV 1 / 2 BatV N

[0077] In some embodiments of the present application, based on the above voltage relationship, the energy storage system can determine that each battery pack is in parallel connection with battery pack N and record the result. If similar determinations are made for all battery packs with open switching devices, and all satisfy the above conditions, it can be confirmed that all battery packs are in parallel connection.

[0078] Figure 5 The circuit schematic of a number of battery packs in series-parallel hybrid connection when the energy storage system is in a resting state is shown, and the specific description is as follows:

[0079] Specifically, as shown in Figure 5 , a more complex battery pack connection mode, i.e., series-parallel hybrid connection, is shown. As an example but not 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. Each battery pack is connected in series with a switching device (MOS tube 1 to MOS tube N) in the figure) for controlling the access and disconnection of the battery pack. It is worth noting that in the hybrid connection structure, the arrangement of the bus voltage detection points also changes accordingly, and the figure shows the "battery pack 1 / 2 bus voltage detection", "battery pack 3 / 4 bus voltage detection", and "battery pack N-1 / N bus voltage detection" measurement points.

[0080] It is not difficult to understand that in the series-parallel hybrid connection mode, the energy storage system needs to identify the connection relationship between each battery pack step by step. As a specific example, it is assumed that the energy storage system first makes battery pack N complete pre-charging and close its switching device (MOS tube N) according to the preset order, becoming the current battery pack. When the energy storage system is in a resting state, it can perform the start-up heating function on all battery packs with open switching devices at one time and measure their bus voltages simultaneously.

[0081] ​In some embodiments of this 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-1 The following conditions will be met:

[0082] PackV N-1 >1 / 2 BatV N

[0083] Other parallel groups (such as battery packs 1 and 2, battery packs 3 and 4, ...) are connected to the battery pack. N When the parallel groups are connected in series, their bus voltages will satisfy the following condition:

[0084] PackV ≤ 1 / 2 BatV N

[0085] As a further example, as the energy storage system continues to identify battery packs in a preset sequence, it closes the switching device for battery pack N-1, then pre-charges the next battery pack with the largest address (such as battery pack N-2) and closes its switching device. At this point, the energy storage system again checks the bus voltage of the remaining battery packs with open switching devices to determine their relationship with the new current battery pack (battery pack N-2). This process continues until the accurate connection relationships between all battery packs are finally identified.

[0086] Figure 6 The circuit diagram showing the series-parallel connection of several battery packs in the energy storage system when it is in the charging activation state is illustrated below:

[0087] Specifically, such as Figure 6 As shown, the circuit structure is similar to... Figure 5 Similarly, but the entire energy storage system receives an inflow of external energy, and the voltage of this external energy inflow is... PackV chg 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, ..., battery pack N-1 and battery pack N form yet another parallel group, and these parallel groups are connected in series. The corresponding heating circuits for each battery pack are not shown in the diagram. C1, C2, C... 3,.... C N-1 C N Key connection points in the circuit are marked for voltage measurement and current path analysis.

[0088] It's easy to understand that when the energy storage system is in a charging activation state, the external charging voltage... PackV chgThe existence of the voltage will interfere with the series-parallel identification method based on the voltage relationship. As an example but not limitation, assuming that the battery pack N is first completed with pre-charging and its switch device is closed according to the preset order, the battery pack N-1 satisfies PackV N-1 1 / 2 BatV N , and the other battery packs satisfy PackV ≤ 1 / 2 BatV N . The switch device of the battery pack N-1 is closed, and the battery packs 1 to N-2 continue to be judged according to the foregoing steps. By analogy, when the energy storage system continues to pre-charge the battery pack 4 and close its switch device according to the preset order, it is necessary to judge the connection relationship of the remaining battery packs (battery packs 1, 2, and 3) and the battery pack 4.

[0089] In the embodiments of the present application, the key problem is that the bus voltage of the battery pack 1 and the battery pack 2 is affected by the existence of the voltage PackV chg . Specifically, the charging voltage PackV chg is applied between C2 and C1 along the red line through the closed MOS tube N, MOS tube N-1, and MOS tube 4, which affects the bus voltage measurement values of the battery pack 1 and the battery pack 2.

[0090] As a more detailed description, in this case, the bus voltages PackV1 and PackV2 of the battery pack 1 and the battery pack 2 satisfy the following relationship:

[0091]

[0092] wherein represents the sum of the bus voltages of all battery packs with closed switch devices, and M represents the number of series relationships, including the series relationship between each parallel battery pack group; for each parallel battery pack group, a group of battery packs is only calculated once for the bus voltage, for example, the battery pack N and the battery pack N-1 are calculated as a group, and the bus voltage PackV N is calculated only once.

[0093] If the voltage PackV chg is high enough at this time, even if the battery packs 1 and 2 are actually in series with the battery pack 4, the measured PackV2 and PackV1 may be greater than half of the total voltage BatV4 of the battery pack 4, so that the energy storage system incorrectly judges that they are in parallel.

[0094] As an example but not limitation, as Figure 6 ​As shown, when MOS4 is opened in the preset order, the battery pack 3 satisfies the condition PackV3 > 1 / 2 BatV4, but this cannot determine that it is in parallel relationship with the battery pack 4. Similarly, the bus voltage of the battery pack 1 and the battery pack 2 can also satisfy the same condition, but in fact they can be in series relationship with the battery pack 4, which forms a contradiction in judgment.

[0095] As a further example, to solve the above problem, new judgment logic needs to be introduced. When the energy storage system is in the charging activation state, if the bus voltage of all battery packs with open switch devices satisfies the parallel condition, the system needs to perform additional verification, at which time the real connection relationship can be determined by heating the battery pack and detecting the system current. Figure 7 The judgment process shown: determine the real connection relationship by heating the battery pack and detecting the system current.

[0096] In some embodiments of the present application, step S400 specifically includes the following steps, and the flowchart is as shown in Figure 7

[0097] Step S410: judge the bus voltage of the target battery pack j PackV j whether it is greater than one half of the total voltage of the battery core of the current battery pack n BatV n

[0098] By comparing the size relationship of the two, the connection mode between the battery packs is preliminarily judged.

[0099] Step S420, if PackV j ≤ 1 / 2 BatV n , the target battery pack j and the current battery pack n are directly determined to be in series relationship.

[0100] Step S430: if PackV j >1 / 2 BatV n , the system current of any determined parallel battery pack group or series battery pack is obtained.

[0101] In the charging activation state, due to the interference of the external charging source, only relying on voltage comparison can lead to misjudgment. As shown, when there is an external charging voltage Figure 6 PackV chg ​​​​​Even if the target battery pack and the current battery pack are actually connected in series, the measured bus voltage may still meet the parallel connection criteria because the charging voltage is conducted through the closed switching device and the path marked by the red line. Therefore, when PackV j >1 / 2 BatV n Further verification is needed.

[0102] when PackV j >1 / 2 BatV n In this case, the energy storage system will measure 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 this 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 the parallel battery pack group or the series battery pack.

[0103] Specifically, the formula for calculating the system current is:

[0104]

[0105] in, m Indicates the first m Parallel battery packs, l Indicates the first m There are in the group l The battery packs are connected in parallel; ChgI m_i For parallel battery packs m The Middle i The charging current of each battery pack DsgI m_i For parallel battery packs m The Middle i The discharge current of each battery pack.

[0106] The same formula applies to a single series-connected battery pack (not connected in parallel with other battery packs), the only difference being that... l =1.

[0107] It is easy to understand that the system current needs to be obtained through the current sampling circuit in the battery management system, which can accurately measure the charging and discharging current of the battery pack.

[0108] Step S440: If the system current is 0, then the target battery pack is determined. j With the current battery pack n They are connected in parallel.

[0109] like Figure 8As shown, the current battery pack is battery pack 4, and the target battery pack is battery pack 3. When the target battery pack 3 and the current battery pack 4 are in parallel, a heating current loop shown by the red line is formed. The current flows from the positive electrode of the battery pack 4, through the heating resistor R3, and then through the MOS 4 back to the negative electrode of the battery pack 4. At this time, only the battery pack 4 has current passing through, and the current detected by other battery packs connected in series with the battery pack 4 is 0, so the system current is 0.

[0110] Subsequently, the energy storage system records the judgment result of the parallel relationship in the memory, providing a basis for subsequent battery management and control.

[0111] Step S450: If the system current is not 0, it is determined that the target battery pack j and the current battery pack n are in series.

[0112] As shown, Figure 9 the current battery pack is battery pack 4, and the target battery pack is battery pack 2. When the target battery pack 2 and the current battery pack 4 are in series, a heating current loop shown by the red line is formed. That is, the current passes through all the battery packs with closed switching devices, and the current of any group of battery packs determined to be in series or parallel is not 0, so the system current is not 0.

[0113] The record of the series relationship is also stored in the battery management system, providing key information for subsequent high-voltage management, charging and discharging control, and protection strategies. Accurate identification of the series relationship is particularly important for preventing overcharging and overdischarging of individual battery packs, and can improve the safety and reliability of the entire energy storage system.

[0114] In some embodiments of the present application, Figure 8 a current loop schematic diagram formed by the parallel connection of the target battery pack and the current battery pack is shown, which is specifically explained as follows:

[0115] Specifically, as shown, Figure 8 the complex structure including multiple battery packs connected in series in parallel groups is shown. At the same time, the external charging voltage chg PackV chg is applied. In the figure, the heating current loop formed when the current battery pack and the target battery pack are in parallel is particularly identified by the red line. It is worth noting that the heating loop of the target battery pack, "heating resistor R3", is specifically shown in the figure, indicating that the heating function of the battery pack 3 has been started. For other battery packs, the heating function is not started, so it is not shown temporarily.

[0116] When the system is in the charging activation state, if it is preliminarily determined that the battery pack 3 and the battery pack 4 may be in parallel PackV 3>1 / 2BatV 4), the energy storage system will further acquire the system current for verification. In some embodiments of the present application, if battery pack 3 and battery pack 4 are indeed in parallel connection, after the heating function of battery pack 3 is started, a current loop shown by the red line in the figure will be formed: the current starts from the positive electrode of battery pack 4, passes through the heating resistor R3, and then returns to the negative electrode of battery pack 4 through the MOS tube 4.

[0117] In this case, the heating current is completely provided by battery pack 4, and the loop only contains the heating resistor of battery pack 3 and battery pack 4, without involving other battery packs or external charging sources. Therefore, the system current detected by all other battery packs with closed switching devices (such as battery packs 5, 6,..., N-1, N) is 0. This is because in the parallel state, the current chooses the path with the smallest impedance, i.e., the local closed loop, and does not flow through other battery packs connected in series.

[0118] In some embodiments of the present application, this feature provides a reliable basis for judging the true parallel connection. When the energy storage system detects that the system current is 0, it can be confirmed that the target battery pack to be heated is in parallel connection with the current battery pack with the closed switching device, thereby avoiding the misjudgment that may be caused by relying only on voltage comparison.

[0119] In some embodiments of the present application, Figure 9 A schematic diagram of the current loop formed by the target battery pack and the current battery pack in series is shown, which is specifically explained as follows:

[0120] Specifically, as shown in Figure 9 , the circuit structure is similar to Figure 8 , but there is a significant difference in the current path identified by the red line. As an example but not limitation, the "heating resistor R2" of the target battery pack is marked in the figure, indicating that the heating function of battery pack 2 has been started. It is worth noting that this figure shows the heating current loop formed when the battery packs are in series connection.

[0121] It is not difficult to understand that when the energy storage system is in the charging activation state, if it is preliminarily judged that battery pack 2 and battery pack 4 may be in parallel connection (based on PackV 2>1 / 2 BatV 4, but in fact, due to the interference of the external charging source, this judgment is inaccurate), the system will further acquire the system current for verification. In some embodiments of the present application, if battery pack 2 and battery pack 4 are actually in series connection, a current loop shown by the red line in the figure will be formed: the current starts from the external charging source, passes through the parallel group of battery pack N-1 and battery pack N,..., then flows through the parallel group of battery pack 3 and battery pack 4, and then passes through the heating resistor R2 of battery pack 2, and finally returns to the charging source, forming a large closed loop.

[0122] As an example but not limitation, in this case, the heating current is provided by the external charging source, and the current path contains all the battery packs with closed switching devices. Therefore, all the battery packs with closed switching devices (such as battery packs 3, 4,...., N-1, N) will detect a non-zero system current. Specifically, the heating current I Heat is equal to the system current SysI m , that is: Heat I m ≠ 0.

[0123] In some embodiments of the present application, this feature provides a reliable basis for judging the true series-parallel relationship. When the energy storage system detects that the system current is not 0, it can be confirmed that the target battery pack is in series with the current battery pack with closed switching devices, thereby correcting the misjudgment that may be caused by relying solely on voltage comparison.

[0124] In some embodiments of the present application, the system current of any determined series battery pack specifically includes the following steps:

[0125] Step S4311: Collect the first charging current of the battery pack determined to be in series.

[0126] This step refers to measuring the charging current of the battery pack that has been identified and recorded as being in series. The charging current refers to the current flowing from the external power source into the battery pack when the energy storage system is in a charging state, and the direction is usually defined as flowing from the positive electrode to the negative electrode of the battery pack. In some embodiments of the present application, the collection of the charging current is usually completed by a current sensor in the battery management system, such as a Hall current sensor or a sampling resistor, etc.

[0127] It is not difficult to understand that the current collection circuit is usually installed on the main current path of the battery pack, which can monitor the current size and direction in real time. The collected charging current data will be processed through filtering, calibration, etc., and then converted into standard digital signals for use by the energy storage system.

[0128] Step S4312: Collect the first discharging current of the battery pack determined to be in series.

[0129] This step refers to measuring the discharging current of the battery pack that has been identified and recorded as being in series. The discharging current refers to the current flowing from the battery pack to the bus when the battery pack is in a discharging state. Its existence is as follows: the battery pack supplies power to the corresponding heating resistor, and the battery pack with a high total cell voltage in the parallel battery pack group supplies power to the battery pack with a low total cell voltage.

[0130] Specifically, the collection of the discharging current is also completed by a current sensor in the battery management system, using the same hardware devices as the charging current measurement. The difference is that the energy storage system will judge whether the current is charging or discharging according to the current direction and record it respectively.

[0131] Step S4313: Obtain the system current according to the first charging current and the first discharging current.

[0132] In some embodiments of the present application, the formula for calculating the system current is:

[0133] System current = |charging current - discharging current|

[0134] It is not difficult to understand that this calculation method takes into account the case that 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-parallel relationship.

[0135] In some other embodiments of the present application, by comparing whether the system current is 0, the real connection relationship between the battery packs can be determined. Specifically, if the system current is 0, it indicates that the heating current forms 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.

[0136] In some other embodiments of the present application, obtaining the system current of any recorded parallel battery pack group specifically includes the following steps:

[0137] Step S4321: Collect the second charging current of each battery pack in the parallel battery pack group that has been determined.

[0138] This step refers to measuring the charging current of each battery pack in the battery pack group that has been identified and recorded as a parallel relationship. For a parallel battery pack group, each battery pack may have different charging currents, depending on parameters such as internal resistance, capacity, SOC state, etc. In some embodiments of the present application, the energy storage system will collect the charging current data of each battery pack through a dedicated current sensor for each battery pack.

[0139] It is not difficult to understand that the collection of charging currents of each battery pack in the parallel battery pack group requires high synchronicity to ensure the time consistency of the data. It is worth noting that there may be an unbalanced phenomenon of charging current between parallel battery packs, which is a normal physical phenomenon and will not affect the calculation of the system current and the judgment of the series-parallel relationship. The energy storage system will record the charging current values of each battery pack separately to prepare for the subsequent calculation of the total charging current.

[0140] Step S4322: Obtain the total charging current according to each second charging current.

[0141] This step refers to adding up the charging currents of all battery packs in the parallel battery pack group to obtain the total charging current of the parallel group.

[0142] Specifically, since the parallel battery packs share the same pair of positive and negative electrodes, according to Kirchhoff's current law, the total charging current is equal to the sum of the charging currents of all single battery packs. The energy storage system considers the direction of the charging current of each battery pack in the calculation process to ensure that the cumulative result accurately reflects the charging state of the entire parallel group.

[0143] Step S4323: Collect the second discharge currents of each battery pack in the parallel battery pack group that has been determined.

[0144] This step refers to measuring the discharge current of each battery pack in the battery pack group that has been identified and recorded as being in parallel. In some embodiments of the present application, the measurement of the discharge current uses the same hardware facilities as the charging current, but the system distinguishes between the current directions and separately records the discharge current values.

[0145] It is not difficult to understand that the discharge currents of the battery packs in the parallel battery pack group can also be unbalanced, mainly due to differences in the internal parameters of the battery packs.

[0146] Step S4324: Obtain the total discharge current based on the second discharge currents of each battery pack.

[0147] Specifically, similar to the calculation of the total charging current, the total discharge current is also based on Kirchhoff's current law, and the discharge currents of all battery packs are accumulated. The energy storage system will ensure correct identification of the current direction and only include the discharge direction current in the calculation.

[0148] Step S4325: Obtain the system current based on the total charging current and the total discharge current.

[0149] In some embodiments of the present application, the formula for calculating the system current is:

[0150] System current = |Total charging current - Total discharge current|

[0151] This calculation method takes into account the complex situation that the parallel battery pack group may have charging and discharging currents at the same time. By taking the absolute value of the difference, the energy storage system can accurately obtain the net current size of the parallel group, thereby providing a reliable basis for the series-parallel relationship judgment.

[0152] In other embodiments of the present application, when heating a battery pack with an open switch device, if the battery pack is in parallel relationship with the current battery pack, the system current is 0; if it is in series relationship, the system current is not 0. This current-based judgment method is particularly suitable for the case where the energy storage system is in a charging activation state and the voltage judgment is inaccurate due to external charging interference.

[0153] Compared with the prior art, the embodiment of the application can accurately identify the series-parallel connection relationship of each battery pack without increasing the cost of the battery pack circuit and additional safety risks, facilitate the system to perform corresponding battery data calculation, pack control and protection scheme control logic, solve the problem that the user's series-parallel connection error is not easy to check, and accurately identify when charging is activated, and meet the complex working condition requirements of the user.

[0154] The embodiment of the application also provides an electronic device based on the above battery pack series-parallel identification method, and a structure diagram is as shown in the figure. Figure 10 The electronic device 100 includes:

[0155] One or more processors 101, a network interface 102 and a memory 103, Figure 10 For example, one processor 101, one network interface 102 and one memory 103.

[0156] The network interface 102 and the corresponding processor 101 are in communication connection, and the processor 101 and the memory 103 can be connected through a bus or other means, Figure 10 For example, through a bus connection.

[0157] The network interface 102 is used to establish a communication connection between the processor 101 and other external devices, including the following types: RJ-45 interface, SC optical fiber interface, AUI interface, FDDI interface and Console interface, etc. Interface type.

[0158] The memory 103 is a kind of non-volatile computer readable storage medium, which can be used to store non-volatile software programs, non-volatile computer executable programs and modules. The processor 101 executes various function applications and data processing of the electronic device by running the non-volatile software programs, instructions and units stored in the memory 103, that is, the battery pack series-parallel identification method of the above method embodiment is realized.

[0159] The memory 103 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required by a function; the data storage area can store data created according to the use of the electronic device, etc. In addition, the memory 103 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 103 can optionally include a memory remotely arranged with respect to the processor 101, and these remote memories can be connected to the electronic device through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0160] The one or more units are stored in the memory 103 and, when executed by the one or more processors 101, perform the battery pack string parallel identification method in any of the method embodiments described above.

[0161] The electronic device described above can perform the battery pack string parallel identification method provided by the embodiments of the present application, has the program module and beneficial effects corresponding to the execution method. The technical details not described in detail in the electronic device embodiment can refer to the battery pack string parallel identification method provided by the embodiments of the present application.

[0162] The embodiments of the present application also provide a non-volatile computer readable storage medium, which can be included in the device described in the above embodiments; or it can exist separately and not be assembled into the device. The non-volatile computer readable storage medium described above carries one or more programs, when the one or more programs are executed, the battery pack string parallel identification method of the embodiments of the present application is realized.

[0163] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; under 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 changes of the different aspects of the present application as described above. In order to be simple, they are not provided in details; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack string parallel identification method, applied to an energy storage system comprising a plurality of battery packs, characterized in that, comprises: Step A, select the current battery pack in the preset order n perform a pre-charge operation and close its switching device; each battery pack is connected to a common power bus via a corresponding switching device; Step B, start the target battery pack j The heating function, and real-time acquisition of the target battery pack. j bus voltage PackV j and current battery pack n Total voltage of battery cells BatV n After data acquisition is complete, shut down the target battery pack. j Heating function; Step C, determining the target battery pack PackV j and the current battery pack BatV n according to the numerical relationship between the bus voltage j and the total voltage of the battery cells n and the current battery pack Step D, for the battery pack determined as parallel relationship j , closing its switching device; Step E, for the battery pack determined as series connection, the next battery pack is selected as the current battery pack according to the preset order, and steps A-D are repeatedly executed until all battery packs complete relationship identification and switch control.

2. The method of claim 1, the number of battery packs communicatively connected through a communication link, wherein, Before the step A, further comprising: based on the serial connection order of the communication link, the several battery packs are addressed; the order is the addressing order.

3. The method of claim 1, wherein, The preset order is a descending order, and the target battery pack in step B is any one of the first to the fourth battery packs. j The first to the fourth battery packs are respectively a first battery pack, a second battery pack, a third battery pack and a fourth battery pack. n -1 battery pack.

4. The method of claim 1, wherein, The preset order is from small to large order, the target battery pack in step B j is the first n+1 to the N battery pack, wherein N is the total number of battery packs.

5. The method of claim 1, wherein, The step C comprises: If PackV j ≤ 1 / 2 BatV n then determine that the target battery pack j is in series with the current battery pack n . If PackV j 1 / 2 BatV n then determine that the target battery pack j is in parallel relationship with the current battery pack n .

6. The method of claim 1, wherein, When the energy storage system is in the charging activation state, the step C further comprises: If all target battery packs satisfy PackV j > 1 / 2 BatV n , the data obtained in step B further comprises 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, it is determined that the target battery pack j is in parallel relationship with the current battery pack n ; if the system current is not 0, it is determined that the target battery pack j is in series relationship with the current battery pack n .

7. The method of claim 6, wherein, The system current of any determined series battery pack is obtained, comprising: collecting the first charging current of the determined series battery pack; collecting the first discharging current of the determined series battery pack; obtaining the system current according to the first charging current and the first discharging current.

8. The method of claim 6, wherein, The system current of any determined parallel battery pack group is obtained, comprising: collecting the second charging current of each battery pack in the determined parallel battery pack group; obtaining the total charging current according to 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 according to each second discharging current; obtaining the system current according to the total charging current and the total discharging current.

9. An electronic device, comprising: comprises: at least one processor; at least one network interface, the network interface being in communication connection with the corresponding processor; and, a memory in communication connection with the at least one processor; wherein the network interface is used to establish the communication connection between the processor and other external devices; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the battery pack series-parallel identification method according to any one of claims 1-8.

10. A non-transitory computer storage medium, comprising, The computer storage medium stores computer executable instructions, and the computer executable instructions are executed by one or more processors to enable the one or more processors to execute the battery pack series-parallel identification method according to any one of claims 1-8.

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