A battery cluster management system and method

Abstract

The application discloses a battery cluster management system and method, which is applied to a battery cluster. The battery cluster comprises a plurality of battery packs connected in series, each battery pack comprises a plurality of battery cells connected in series, at least one virtual battery cell is contained in at least one battery pack, and the battery cluster management system comprises a battery cluster management unit and a battery cell sampling circuit. The battery cell sampling circuit is used for sampling the battery cell voltage of each battery cell of each battery pack. The battery cluster management unit is used for identifying the battery cell as a virtual battery cell when the battery cell voltage is less than a first preset value. The battery cluster management system provided by the application can automatically identify the virtual battery cell simply and quickly in the case that the positions of the virtual battery cells in the battery cluster are different, so that the virtual battery cell can be controlled in subsequent battery cluster operation control.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to a management system and method for a battery cluster. Background Technology

[0002] A battery cluster consists of multiple battery packs connected in series; a battery pack consists of multiple battery cells connected in series. To meet different power requirements, battery clusters can use battery packs of different models connected in series. To produce multiple models of battery packs simultaneously in mass production, cell bridging can be used to adjust the capacity of different models. Cell bridging refers to replacing some of the actual battery cells in the battery pack with virtual cells, thereby changing the capacity of the battery pack.

[0003] During battery cluster operation, virtual cells require special handling. However, connecting different battery pack models in series can lead to significant differences in battery clusters; the number of battery packs, the number of cells, and the installation order of different battery pack models may all vary. Therefore, recording the position of each virtual cell individually is extremely labor-intensive and prone to errors, which is detrimental to the subsequent operation and control of the battery cluster. Summary of the Invention

[0004] In view of this, this application provides a battery cluster management system and method that can automatically and easily identify the location of virtual cells in an energy storage system.

[0005] To solve the above problems, the technical solution provided in this application is as follows:

[0006] The first aspect of this application provides a management system for a battery cluster, the battery cluster comprising: multiple battery packs connected in series;

[0007] Each battery pack includes multiple cells connected in series; at least one battery pack contains at least one dummy cell.

[0008] The battery cluster management system includes: a battery cluster management unit and a cell sampling circuit;

[0009] The cell sampling circuit is used to sample the cell voltage of each cell in each battery pack;

[0010] The battery cluster management unit is used to identify a battery cell as a virtual battery cell when the cell voltage is less than a first preset value.

[0011] Preferably, the battery cluster management unit is further configured to identify a battery cell as a real battery cell when the cell voltage is greater than or equal to a first preset value; compare the number of real battery cells with the preset number of battery cells, and if they are inconsistent, the virtual battery cell identification fails.

[0012] Preferably, the battery cluster management unit is further configured to identify a battery cell as a real battery cell when the cell voltage is greater than or equal to a first preset value; and to determine whether the voltage of all real battery cells is greater than a second preset value. If not, the virtual battery cell identification fails.

[0013] The second preset value is greater than the first preset value.

[0014] Preferably, the battery cluster further includes: a battery cluster sampling circuit;

[0015] Battery cluster sampling circuit, used to sample the total voltage of the battery cluster;

[0016] The battery cluster management unit is also used to obtain the total cell voltage based on the cell voltage at both ends of all cells in all battery packs; if the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, the virtual cell identification fails.

[0017] Preferably, the battery cluster management unit is further configured to update the cell voltage to zero when the cell voltage is less than a first preset value;

[0018] The battery cluster management unit is specifically used to obtain the total cell voltage based on the cell voltages at both ends of all cells in all battery packs after the cell voltage is updated.

[0019] Preferably, the battery cluster management unit is further configured to determine that the cell sampling circuit corresponding to the cell is malfunctioning when the cell voltage is greater than a third preset value;

[0020] The third preset value is greater than the second preset value.

[0021] The second aspect of this application provides a method for managing battery clusters, which is applied to the battery cluster management system described above;

[0022] Battery cluster management methods include:

[0023] Obtain the cell voltage of each cell in each battery pack;

[0024] When the cell voltage is less than a first preset value, the cell is identified as a virtual cell.

[0025] Preferably, it further includes:

[0026] When the cell voltage is greater than or equal to a first preset value, the cell is identified as a genuine cell.

[0027] The number of real battery cells is compared with the preset number of battery cells. If they are inconsistent, the virtual battery cell recognition fails.

[0028] Preferably, it further includes:

[0029] When the cell voltage is greater than or equal to a first preset value, the cell is identified as a genuine cell.

[0030] Determine whether the voltage of all real battery cells is greater than the second preset value. If not, the virtual battery cell recognition fails.

[0031] The second preset value is greater than the first preset value.

[0032] Preferably, it further includes:

[0033] Obtain the total voltage of the battery cluster;

[0034] The total cell voltage is obtained by calculating the cell voltage across all cells in all battery packs.

[0035] If the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, the virtual cell identification will fail.

[0036] Preferably, the total cell voltage is obtained based on the cell voltages at both ends of all cells in all battery packs, including:

[0037] When the cell voltage is lower than the first preset value, the cell voltage is updated to zero;

[0038] After the cell voltage is updated, the total cell voltage is obtained based on the cell voltages at both ends of all cells in all battery packs.

[0039] Preferably, it further includes:

[0040] When the cell voltage exceeds the third preset value, virtual cell identification fails.

[0041] The third preset value is greater than the second preset value.

[0042] Therefore, this application has the following beneficial effects:

[0043] The battery cluster management system provided in this application includes a battery cluster comprising multiple battery packs connected in series; each battery pack comprises multiple cells connected in series, and at least one battery pack contains at least one virtual cell. The battery cluster management system includes a battery cluster management unit and a cell sampling circuit; the cell sampling circuit samples the cell voltage of each cell in each battery pack; the battery cluster management unit identifies a cell as a virtual cell when its voltage is less than a first preset value; since the virtual cell does not provide voltage, the voltage across its terminals is very small, hence the battery cluster management unit identifies it as a virtual cell when its voltage is less than the first preset value. The battery cluster management system provided in this application can easily and quickly automatically identify virtual cells even when their positions within the battery cluster differ, facilitating subsequent control of the virtual cells during battery cluster operation. Attached Figure Description

[0044] Figure 1A schematic diagram of a battery cluster management system provided in an embodiment of this application;

[0045] Figure 2 A schematic diagram of another battery cluster management system provided in an embodiment of this application;

[0046] Figure 3 A flowchart illustrating a battery cluster management method provided in an embodiment of this application;

[0047] Figure 4 A flowchart illustrating another battery cluster management method provided in this application embodiment. Detailed Implementation

[0048] To enable those skilled in the art to better understand and implement the technical solutions of this application, the specific application scenarios of this application are described below.

[0049] When mass-producing battery packs, components such as battery cells can be made into open-mold parts so that various battery pack models can be adjusted by using cell bridging.

[0050] For example, when a battery cluster needs to be connected in series with a battery pack containing 60 actual cells, a battery pack containing 64 actual cells can be used. Four of these actual cells can be replaced with virtual cells, thus changing the number of actual cells in the battery pack to 60. It should be understood that using virtual cells can easily and quickly meet the different power requirements of the battery cluster and is easy to mass-produce.

[0051] Different battery clusters may use different numbers of battery packs and cells; correspondingly, the positions of the virtual cells will also differ. Furthermore, the positions of the virtual cells will vary depending on the installation order of different battery pack models. Therefore, recording the position of each virtual cell individually is extremely labor-intensive.

[0052] Therefore, this application provides an energy storage system and a method for automatically identifying virtual cells, which can automatically identify virtual cells in the current battery cluster and record the position of the virtual cells, so that the battery cluster can be controlled and processed according to the position of the virtual cells in subsequent operation.

[0053] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0054] See Figure 1 The figure is a schematic diagram of a battery cluster management system provided in an embodiment of this application.

[0055] The battery cluster management system provided in this application includes: a battery cluster management unit (CMU) and a cell sampling circuit (not shown in the figure).

[0056] A battery cluster consists of multiple battery packs connected in series.

[0057] This application does not specifically limit the number of battery packs in the battery cluster. For ease of description, the following description uses a battery cluster consisting of 3 battery packs as an example.

[0058] The multiple battery packs include: a first battery pack PACK1, a second battery pack PACK2, and a third battery pack PACK3.

[0059] A battery pack includes multiple cells connected in series; at least one battery pack contains a dummy cell among its multiple cells.

[0060] It should be understood that the number of cells included in each battery pack may vary, and this application does not make any specific limitation on this.

[0061] This application does not specifically limit the number of battery cells, but for ease of description, the following example will be used, in which each battery pack includes 64 battery cells, and the second battery pack PACK2 and the third battery pack PACK3 each include 4 virtual battery cells.

[0062] Specifically, the first battery pack PACK1 includes 64 real battery cells, namely CELL1 to CELL64; the second battery pack PACK2 and the third battery pack PACK3 each include 60 real battery cells, namely CELL1 to CELL60, and 4 virtual battery cells.

[0063] It should be understood that Figure 1 The location of the virtual cell is only one possible implementation. The virtual cell can also be connected between other real cells, and the virtual cells can also be connected in a distributed manner. Furthermore, the location of the virtual cells in different battery packs can also be different. This application does not make any specific limitations on this.

[0064] The cell sampling circuit is used to sample the cell voltage of each cell in each battery pack.

[0065] This application does not specifically limit the specific implementation method of the cell sampling circuit. For example, a battery sampling chip (Analog Front End, AFE) can be used to sample each cell; wherein, each AFE can sample the cell voltage of multiple cells.

[0066] The battery cluster management unit (CMU) is used to identify a battery cell as a virtual cell when the cell voltage is less than a first preset value.

[0067] It should be understood that virtual cells do not provide voltage or capacity. The role of virtual cells is to connect other real cells to maintain the real cells in series. Therefore, the voltage value across the virtual cell is very small. When the cell voltage is less than a first preset value, the battery cluster management unit (CMU) identifies the cell as a virtual cell.

[0068] This application does not specifically limit the value of the first preset value. Those skilled in the art can consider errors in the cell sampling circuit and adjust the first preset value according to their needs. Preferably, the first preset value can be 400mV.

[0069] The battery cluster management system provided in this application embodiment includes a battery cluster comprising multiple battery packs connected in series; each battery pack comprises multiple cells connected in series; at least one of the battery packs includes at least one virtual cell; the battery cluster management system includes a battery cluster management unit and a cell sampling circuit. The cell sampling circuit samples the cell voltage of each cell in each battery pack; the battery cluster management unit identifies a cell as a virtual cell when its cell voltage is less than a first preset value; since the virtual cell does not provide voltage, the voltage across the virtual cell is very small, therefore, when the cell voltage is less than the first preset value, the battery cluster management unit identifies the cell as a virtual cell. The battery cluster management system provided in this application embodiment can easily and quickly automatically identify virtual cells even when their positions within the battery cluster are different, so that the virtual cells can be controlled subsequently in the battery cluster operation control.

[0070] In some embodiments, the battery cluster management unit can perform further management to improve the accuracy of identifying virtual cells. One possible implementation is described below.

[0071] See Figure 2 This figure is a schematic diagram of another battery cluster management system provided in an embodiment of this application.

[0072] The structure of the battery cluster used in this application embodiment can be found in the above embodiments, and will not be repeated here.

[0073] The battery cluster management system provided in this application embodiment includes, in addition to the battery cluster management unit (CMU) and cell sampling circuit (not shown in the figure) described in the above embodiments, a battery cluster sampling circuit 100.

[0074] Similar to the above embodiments, the cell sampling circuit is used to sample the cell voltage of each cell in each battery pack; the battery cluster management unit (CMU) is used to identify the cell as a virtual cell when the cell voltage is less than a first preset value.

[0075] The battery cluster management unit (CMU) is also used to identify a battery cell as a real battery cell when the cell voltage is greater than or equal to a first preset value; and to compare the number of real battery cells with the preset number of battery cells. If they are inconsistent, the identification of virtual battery cells fails.

[0076] It should be understood that in each battery pack of the battery cluster, apart from the virtual cells, the remaining cells are all real cells.

[0077] The actual number of battery cells identified by the battery cluster management unit (CMU) should match the preset number of battery cells when the battery cluster was installed. Figure 1 For example, in a battery cluster, the number of actual battery cells identified by the Battery Cluster Management Unit (CMU) should be 64 + 60 + 60 = 184. If this is inconsistent, it indicates an error in the identification of virtual battery cells, either misidentifying actual battery cells as virtual cells or vice versa.

[0078] Therefore, when the number of actual battery cells is inconsistent with the preset number of battery cells, the identification of virtual battery cells fails.

[0079] The battery cluster management unit (CMU) is also used to determine whether the voltage of all real battery cells is greater than a second preset value. If not, the virtual battery cell identification fails.

[0080] The second preset value is greater than the first preset value.

[0081] If the voltage of a real battery cell is less than or equal to the second preset value, it indicates that the corresponding battery cell may be low on charge. When a real battery cell is low on charge, its voltage is also low; therefore, identifying a virtual battery cell based on its low voltage will result in a large error, and may even misidentify a battery cell with low charge as a virtual battery cell, leading to inaccurate identification.

[0082] Therefore, when the voltage of a real battery cell is lower than the second preset value, the identification of the virtual battery cell fails.

[0083] This application does not specifically limit the value of the second preset value. Those skilled in the art can set the second preset value in a specific way according to the required recognition accuracy, etc.; preferably, the second preset value can be 3V.

[0084] The battery cluster sampling circuit 100 is connected to both ends of the battery cluster and is used to sample the total voltage of the battery cluster.

[0085] This application does not specifically limit the specific implementation of the battery cluster sampling circuit 100. For example, the battery cluster sampling circuit 100 can be implemented as a function inside the battery cluster management unit (CMU); or it can be independent of the battery cluster management unit (CMU).

[0086] The battery cluster management unit (CMU) is also used to obtain the total cell voltage based on the cell voltages at both ends of all cells in all battery packs; if the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, the virtual cell identification fails.

[0087] The total cell voltage is the sum of the cell voltages at both ends of all cells in the entire battery pack.

[0088] The total voltage of the battery cluster should theoretically be equal to the total voltage of the individual cells. However, considering the potential errors in the battery cluster sampling circuit 100 and the cell sampling circuit, the difference between the two is allowed to be within a preset threshold.

[0089] If the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, it indicates that there may be a fault in the battery cluster sampling circuit 100 and / or the cell sampling circuit in the battery cluster management system. If the cell sampling circuit is faulty, the cell voltage obtained through the cell sampling circuit will not accurately identify the virtual cells.

[0090] If the difference between the total cell voltage and the total voltage of the battery pack exceeds the preset threshold, it may also be due to a fault in the internal connection of the battery pack, such as a battery pack not being properly connected, resulting in a low total voltage.

[0091] Therefore, when the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, the identification of the virtual cell fails.

[0092] This application does not specifically limit the value of the preset threshold; those skilled in the art can set it specifically according to the allowable error range. Preferably, the preset threshold can be 5V.

[0093] The battery cluster management unit (CMU) is also used to determine if the cell sampling circuit corresponding to a cell is malfunctioning when the cell voltage is greater than a third preset value.

[0094] The third preset value is greater than the second preset value.

[0095] There is a voltage limit for the battery cell. When the battery cell voltage sampled by the battery cell sampling circuit exceeds the battery cell voltage limit, that is, exceeds the third preset value, it indicates that there is a fault in the battery cell sampling circuit corresponding to that battery cell.

[0096] This application does not specifically limit the value of the third preset value, and those skilled in the art can set it specifically according to the type of battery cell; preferably, the third preset value can be 4.5V.

[0097] The battery cluster management unit provided in this application embodiment further identifies real battery cells and determines whether the number of real battery cells matches the preset number of battery cells, further ensuring the accuracy of virtual battery cell identification; it also determines whether the voltage of the real battery cells is greater than a second preset value, ensuring that virtual battery cells are identified only when the real battery cells have sufficient power, thus improving the accuracy of virtual battery cell identification; the battery cluster management unit also includes a battery cluster sampling circuit; the battery cluster sampling circuit samples the total voltage of the battery cluster and compares it with the total cell voltage obtained from the cell voltages at both ends of all cells in all battery packs, further ensuring the accuracy of the cell sampling circuit and the absence of faulty connections within the battery cluster; the battery cluster management unit also determines that the cell sampling circuit corresponding to the cell is malfunctioning when the cell voltage is greater than a third preset value, further ensuring the accuracy of the cell sampling circuit.

[0098] In some embodiments, the battery cluster management unit (CMU) can also be further configured to update the cell voltage to zero when the cell voltage is less than a first preset value.

[0099] Correspondingly, the battery cluster management unit (CMU) is specifically used to obtain the total cell voltage based on the cell voltages at both ends of all cells in all battery packs after the cell voltage is updated.

[0100] Before the battery cluster management unit (CMU) obtains the total cell voltage, updating the voltage of the identified virtual cells to zero can reduce the error of the cell voltage obtained by the cell sampling circuit, further improve the accuracy of fault judgment of the cell sampling circuit, and thus improve the accuracy of virtual cell identification.

[0101] Based on the battery cluster management system provided in the above embodiments, this application also provides a battery cluster management method, which will be described in detail below with reference to the accompanying drawings.

[0102] See Figure 3 The figure is a flowchart of a battery cluster management method provided in an embodiment of this application.

[0103] The battery cluster management method provided in this application embodiment is applied to the battery cluster management system described in the above embodiments.

[0104] The method includes:

[0105] S301: Obtain the cell voltage of each cell in each battery pack.

[0106] S302: When the cell voltage is less than the first preset value, the cell is identified as a virtual cell.

[0107] It should be understood that virtual cells do not provide voltage or capacity. The role of virtual cells is to connect other real cells, keeping them in series. Therefore, the voltage across a virtual cell is very small.

[0108] Therefore, when the cell voltage is less than the first preset value, the cell is identified as a virtual cell.

[0109] This application does not specifically limit the value of the first preset value. Those skilled in the art can consider sampling errors and adjust the first preset value according to their needs. Preferably, the first preset value can be 400mV.

[0110] The battery cluster management method provided in this application includes a battery cluster comprising multiple battery packs connected in series; each battery pack comprises multiple cells connected in series; at least one of the battery packs includes at least one virtual cell; the method includes: acquiring the cell voltage of each cell in each battery pack; and identifying the cell as a virtual cell when the cell voltage is less than a first preset value. Since the virtual cell does not provide voltage and only serves a connection function, the voltage across the virtual cell is very small. The battery cluster management method provided in this application can easily and quickly automatically identify virtual cells even when their positions within the battery cluster are different, enabling subsequent control of the virtual cells during battery cluster operation.

[0111] In some embodiments, to improve the accuracy of identifying virtual battery cells, this application may also determine other parameters. One possible implementation is described below.

[0112] See Figure 4 The figure is a flowchart of another battery cluster management method provided in an embodiment of this application.

[0113] The battery cluster management method provided in this application includes:

[0114] S401: Check if there is a virtual cell identification command. If so, proceed to step S402.

[0115] S402: Obtain the cell voltage of each cell in each battery pack.

[0116] S403: When the cell voltage is less than the first preset value, identify the cell as a virtual cell; otherwise, identify the cell as a real cell.

[0117] S404: Determine if the cell voltage is greater than the third preset value. If so, virtual cell recognition fails.

[0118] The third preset value is greater than the second preset value.

[0119] There is a voltage limit for the battery cell. When the obtained battery cell voltage exceeds the voltage limit, that is, exceeds the third preset value, it means that the obtained battery cell voltage is inaccurate, and therefore the virtual battery cell identification fails.

[0120] S405: Determine whether the number of actual battery cells matches the preset number of battery cells. If they do not match, the virtual battery cell recognition fails.

[0121] It should be understood that in each battery pack of the battery cluster, apart from the virtual cells, the remaining cells are all real cells.

[0122] The number of actual battery cells identified by the Battery Cluster Management Unit (CMU) should match the preset number of battery cells when the battery cluster was installed. If they do not match, it indicates an error in the identification of virtual battery cells.

[0123] S406: Determine whether the voltage of all real battery cells is greater than the second preset value. If not, the virtual battery cell recognition fails.

[0124] The second preset value is greater than the first preset value.

[0125] If the voltage of a real battery cell is less than or equal to the second preset value, it indicates that the corresponding battery cell may be low on charge. When a real battery cell is low on charge, its voltage is also low; therefore, identifying a virtual battery cell based on its low voltage will result in a large error, and may even misidentify a battery cell with low charge as a virtual battery cell, leading to inaccurate identification.

[0126] S407: Obtain the total voltage of the battery cluster.

[0127] S408: Update the cell voltage of the virtual cell to 0.

[0128] S409: Obtain the total cell voltage based on the cell voltages at both ends of all cells in all battery packs.

[0129] Updating the cell voltage of the virtual cell to 0 can reduce errors and make the obtained total cell voltage more accurate.

[0130] It should be understood that, in order to simplify the identification process of virtual cells, step S408 may be omitted.

[0131] S410: Determine whether the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold. If so, virtual cell identification fails.

[0132] If the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, it indicates that the sampled voltage is inaccurate, and therefore the identification of virtual cells will also be inaccurate.

[0133] If the difference between the total cell voltage and the total voltage of the battery pack exceeds the preset threshold, it may also be due to a fault in the internal connection of the battery pack, such as a battery pack not being properly connected, resulting in a low total voltage.

[0134] The battery cluster management method provided in this application further includes determining that the acquired cell voltage is inaccurate when it exceeds a third preset value; identifying real cells and determining whether the number of real cells matches the preset number of cells, further ensuring the accuracy of virtual cell identification; determining whether the voltage of all real cells is greater than a second preset value, ensuring that virtual cells are identified only when the real cells have sufficient charge, thus improving the accuracy of virtual cell identification; and acquiring the total voltage of the battery cluster, updating the cell voltage of the virtual cells to 0, obtaining the total cell voltage, and comparing it with the total voltage of the battery cluster, ensuring the accuracy of the cell sampling circuit and fault-free connection within the battery cluster.

[0135] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0136] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cluster management system, characterized in that, The battery cluster includes: multiple battery packs connected in series; Each of the battery packs includes multiple cells connected in series; at least one of the battery packs contains at least one dummy cell; The battery cluster management system includes: a battery cluster management unit and a cell sampling circuit; The cell sampling circuit is used to sample the cell voltage of each cell in each battery pack; The battery cluster management unit is used to identify the battery cell as a virtual battery cell when the battery cell voltage is less than a first preset value, and to record the position of the virtual battery cell.

2. The battery cluster management system according to claim 1, characterized in that, The battery cluster management unit is further configured to identify the battery cell as a real battery cell when the battery cell voltage is greater than or equal to the first preset value; compare the number of real battery cells with the preset number of battery cells, and if they are inconsistent, the virtual battery cell identification fails.

3. The battery cluster management system according to claim 1, characterized in that, The battery cluster management unit is further configured to identify a battery cell as a real battery cell when the battery cell voltage is greater than or equal to the first preset value; and to determine whether the voltage of all real battery cells is greater than the second preset value. If not, the virtual battery cell identification fails. Wherein, the second preset value is greater than the first preset value.

4. The battery cluster management system according to any one of claims 1-3, characterized in that, The battery cluster also includes: a battery cluster sampling circuit; The battery cluster sampling circuit is used to sample the total voltage of the battery cluster; The battery cluster management unit is further configured to obtain the total cell voltage based on the cell voltages at both ends of all the cells in all the battery packs; if the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, the virtual cell identification fails.

5. The battery cluster management system according to claim 4, characterized in that, The battery cluster management unit is also used to update the cell voltage to zero when the cell voltage is less than the first preset value; The battery cluster management unit is specifically used to obtain the total cell voltage based on the cell voltages at both ends of all cells in all battery packs after the cell voltage is updated.

6. The battery cluster management system according to any one of claims 1-3, characterized in that, The battery cluster management unit is also used to determine that the cell sampling circuit corresponding to the cell is malfunctioning when the cell voltage is greater than a third preset value. The third preset value is greater than the second preset value.

7. A method for managing battery clusters, characterized in that, The battery cluster includes: multiple battery packs connected in series; Each of the battery packs includes multiple cells connected in series; at least one of the battery packs contains at least one dummy cell; The method includes: Obtain the cell voltage of each cell in each of the battery packs; When the cell voltage is less than a first preset value, the cell is identified as a virtual cell, and the position of the virtual cell is recorded.

8. The method according to claim 7, characterized in that, Also includes: When the cell voltage is greater than or equal to the first preset value, the cell is identified as a genuine cell; The number of real battery cells is compared with the preset number of battery cells. If they are inconsistent, the virtual battery cell identification fails.

9. The method according to claim 7, characterized in that, Also includes: When the cell voltage is greater than or equal to the first preset value, the cell is identified as a genuine cell; Determine whether the voltage of all the real battery cells is greater than the second preset value. If not, the virtual battery cell identification fails. Wherein, the second preset value is greater than the first preset value.

10. The method according to any one of claims 7-9, characterized in that, Also includes: Obtain the total voltage of the battery cluster; The total cell voltage is obtained based on the cell voltages at both ends of all the cells in all the battery packs. If the difference between the total cell voltage and the total voltage of the battery cluster exceeds a preset threshold, the virtual cell identification fails.

11. The method according to claim 10, characterized in that, The step of obtaining the total cell voltage based on the cell voltages at both ends of all the cells in all the battery packs includes: When the cell voltage is less than the first preset value, the cell voltage is updated to zero; After the cell voltage is updated, the total cell voltage is obtained based on the cell voltages at both ends of all cells in all the battery packs.

12. The method according to any one of claims 7-9, characterized in that, Also includes: When the cell voltage is greater than a third preset value, virtual cell identification fails. The third preset value is greater than the second preset value.

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