Battery cell sampling device, method, battery management system and battery pack

Abstract

The present invention discloses a cell sampling device, method, battery management system and battery pack, which relate to the field of battery management technology. The device is connected to a battery module, and the device includes: a main control module, two sampling modules connected to the main control module, and the two sampling modules are connected to the battery module; the sampling module collects the cell voltage of the battery module, performs initial calculations, obtains the sampling voltage, and sends the sampling voltage to the main control module; the main control module summarizes and calculates the sampling voltages sent by the two sampling modules to obtain the voltage sampling results. The present invention solves the problem in the prior art that the cell wires of the battery module must be plugged in one-to-one with the cell sampling sockets of the BMS mainboard, resulting in a large workload, and realizes that the cell wires of the battery module can be arbitrarily plugged into any sampling module in the cell sampling device, thereby reducing the workload of producing and assembling battery packs.

Description

Technical Field

[0001] The present invention relates to the field of battery management technology, and in particular to a battery cell sampling device, method, battery management system and battery pack. Background Art

[0002] The BMS system (Battery Management System) is a system that intelligently manages and maintains each battery unit. It can prevent the battery from overcharging and over-discharging, extend the battery life, and monitor the battery status.

[0003] In current battery packs, the BMS system is generally set on the BMS mainboard, which is connected to the battery module to sample the voltage of the battery module. When connecting the BMS mainboard and the battery module, the battery cell wires of the battery module need to be plugged into the battery cell sampling socket of the BMS mainboard one by one, and no wrong plugging is allowed, otherwise the BMS mainboard will be damaged. Correspondingly, when producing and assembling battery packs, it is necessary to check whether the battery cell wires of each battery module correspond to the battery cell sampling socket of the BMS mainboard, which results in a large workload. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery cell sampling device, method, battery management system and battery pack, aiming to solve the technical problem in the prior art that the battery cell wires of the battery module must be plugged into the battery cell sampling sockets of the BMS mainboard one by one, resulting in a large workload.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a battery cell sampling device, the device is connected to a battery module, the device comprises a main control module; two sampling modules connected to the main control module; the two sampling modules are connected to the battery module;

[0007] The sampling module is used to collect the cell voltage of the battery module, perform initial calculation, obtain the sampled voltage, and send the sampled voltage to the main control module;

[0008] The main control module is used to summarize and calculate the sampled voltages sent by the two sampling modules to obtain voltage sampling results.

[0009] Optionally, in the above-mentioned battery cell sampling device, the sampling module includes a sampling unit and a slave control unit connected to each other, the sampling unit is connected to any wiring harness of the battery module, and the slave control unit is connected to the main control module;

[0010] The sampling unit is used to collect the cell voltage of the battery module and send the cell voltage to the slave control unit;

[0011] The slave control unit is used to perform initial calculation on the cell voltage, obtain a sampled voltage, and send the sampled voltage to the main control module.

[0012] Optionally, in the above-mentioned battery cell sampling device, the sampling unit includes an analog front-end sampling chip and a battery cell sampling socket connected to pins of the analog front-end sampling chip.

[0013] Optionally, in the above-mentioned battery cell sampling device, the sampling module further comprises a power supply unit connected to the sampling unit and the slave control unit respectively, and the power supply unit is connected to the battery module;

[0014] The power supply unit is used to supply power to the sampling unit and the slave control unit.

[0015] Optionally, in the above-mentioned battery cell sampling device, the battery module includes a high battery cell and a low battery cell connected in series, a high battery cell wire arranged on the high battery cell and a low battery cell wire arranged on the low battery cell; the high battery cell wire and the low battery cell wire are connected to any one of the two sampling modules through a battery cell sampling terminal.

[0016] Optionally, in the above-mentioned battery cell sampling device, a power line terminal and a ground terminal are provided on the power supply unit, the power line terminal is connected to the positive electrode of the high battery cell or the low battery cell, and the ground terminal is connected to the negative electrode of the high battery cell or the low battery cell.

[0017] Optionally, in the above-mentioned battery cell sampling device, the sampling unit is connected to the slave control unit via an I2C bus, and the slave control unit is connected to the main control module via an SPI bus.

[0018] In a second aspect, the present invention provides a cell sampling method, which is applied to the cell sampling device as described above, and the method comprises:

[0019] The sampling module collects the cell voltage of the battery module, performs initial calculation, obtains the sampled voltage, and sends the sampled voltage to the main control module;

[0020] The main control module summarizes and calculates the sampled voltages sent by the two sampling modules to obtain the voltage sampling results.

[0021] In a third aspect, the present invention provides a battery management system, the system comprising:

[0022] The cell sampling device as mentioned above is used to collect the cell voltage of the battery module and obtain the voltage sampling result;

[0023] The battery management control device is used to generate a battery management control instruction according to the voltage sampling result to control the battery module.

[0024] In a fourth aspect, the present invention provides a battery pack, the battery pack comprising:

[0025] Battery module;

[0026] A BMS mainboard connected to the battery module; the BMS mainboard is provided with the battery management system as described above.

[0027] The above one or more technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects:

[0028] The present invention proposes a battery cell sampling device, method, battery management system and battery pack. Two sampling modules are arranged on the battery cell sampling device to respectively collect the battery cell voltages of the battery module. After each of them performs initial calculation to obtain the sampled voltage, they are uniformly sent to the main control module. The main control module summarizes and calculates the two sampled voltages to obtain the voltage sampling result. This enables the battery cell lines of the battery module to be arbitrarily plugged into any sampling module in the battery cell sampling device, fundamentally solving the problem of needing to confirm each time plugging in, and reducing the workload of producing and assembling the battery pack. The adaptability of the device is also increased, and it can be applicable to battery modules including batteries from multiple different manufacturers or with different parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 This is a connection diagram of the first embodiment of the battery cell sampling device of the present invention;

[0031] Figure 2 This is a connection diagram of the second embodiment of the battery cell sampling device of the present invention;

[0032] Figure 3 This is a connection diagram of the third embodiment of the battery cell sampling device of the present invention;

[0033] Figure 4 Schematic diagram of the process of the first embodiment of the battery cell sampling method of the present invention.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that in the present invention, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, the elements defined by the sentence "includes..." do not exclude the existence of other identical elements in the process, method, article or system including the element. In addition, in the present invention, unless otherwise clearly specified and defined, the terms "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0037] In the present invention, if there is a description involving "first", "second", etc., the description of "first", "second", etc. is only for descriptive purposes and cannot be understood as indicating or suggesting its relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, in the present invention, the use of suffixes such as "module", "component" or "unit" used to represent elements is only to facilitate the description of the present invention and has no specific meaning in itself. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0038] For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0039] Analysis of the prior art found that in current battery packs, the BMS system is generally set on the BMS mainboard, connected to the battery module through the BMS mainboard, and the voltage of the battery module is sampled using a sampling chip and an MCU (Microcontroller Unit) set on the BMS mainboard. For this type of battery pack, when connecting the BMS mainboard and the battery module, it is necessary to plug the battery cell wires of the battery module into the battery cell sampling socket of the BMS mainboard one by one, and there must be no wrong plugging, otherwise the BMS mainboard will be damaged. Correspondingly, when producing and assembling battery packs, it is necessary to check one by one whether the battery cell wires of each battery module correspond to the battery cell sampling socket of the BMS mainboard, and then plug the battery cell wires into the designated interface of the battery cell sampling socket, and blind plugging is not allowed. Therefore, the prior art has the problem of a large workload when producing and assembling battery packs.

[0040] In view of the technical problem in the prior art that the cell wires of the battery module must be plugged in one-to-one with the cell sampling sockets of the BMS mainboard, which leads to a large workload, the present invention provides a cell sampling device, and the overall idea is as follows:

[0041] The device is connected to a battery module, and comprises a main control module, two sampling modules connected to the main control module, and the two sampling modules are connected to the battery module;

[0042] The sampling module is used to collect the cell voltage of the battery module, perform initial calculation, obtain the sampled voltage, and send the sampled voltage to the main control module;

[0043] The main control module is used to summarize and calculate the sampled voltages sent by the two sampling modules to obtain voltage sampling results.

[0044] Through the above technical scheme, two sampling modules are arranged on the battery cell sampling device to respectively collect the battery cell voltage of the battery module. After each of them performs initial calculation to obtain the sampling voltage, they are uniformly sent to the main control module, which summarizes and calculates the two sampling voltages to obtain the voltage sampling result. This enables the battery cell wires of the battery module to be arbitrarily plugged into any sampling module in the battery cell sampling device, fundamentally solving the problem that each plug-in needs to be confirmed one by one, and reducing the technical effect of the workload of producing and assembling battery packs; it also increases the adaptability of the device, and can be applicable to battery modules including batteries from multiple different manufacturers or with different parameters.

[0045] Embodiment 1

[0046] Reference Figure 1 A connection schematic diagram is provided, and a first embodiment of a battery cell sampling device of the present invention is proposed. The battery cell sampling device is applied to a battery pack, and specifically to a BMS mainboard in a battery pack.

[0047] The battery pack refers to a power source that provides power for tools, such as a power battery that provides power for new energy equipment such as electric cars, electric trains, and electric bicycles. The power battery can be a lithium battery, a lead-acid battery, and the like.

[0048] Based on the above battery pack, the following Figure 1 The connection schematic diagram shown is used to describe the battery cell sampling device of this embodiment in detail.

[0049] The device is connected to the battery module, and the device may include:

[0050] A main control module; two sampling modules connected to the main control module; the two sampling modules are connected to the battery module;

[0051] The sampling module is used to collect the cell voltage of the battery module, perform initial calculation, obtain the sampled voltage, and send the sampled voltage to the main control module;

[0052] The main control module is used to summarize and calculate the sampled voltages sent by the two sampling modules to obtain voltage sampling results.

[0053] Specifically, the device is connected to the battery module through a battery cell line. The device includes a main control module and two sampling modules. The main control module can be a main MCU (Microcontroller Unit). The number of sampling modules can be determined according to the number of battery cell groups in the battery module. For example, the battery cell group of this embodiment includes 8 strings of high batteries and 8 strings of low batteries in series, a total of 16 strings of batteries. The 8 strings of high batteries are combined into a wire harness, i.e., a high wire harness, and the 8 strings of low batteries are combined into a wire harness, i.e., a low wire harness. Correspondingly, the two sampling modules are the first sampling module and the second sampling module. The first sampling module and the second sampling module are independent of each other, but are both connected to the battery cell group, and can be connected arbitrarily when connected. That is to say, the high wire harness can be connected to the first sampling module or the second sampling module. Correspondingly, the low wire harness can be connected to the second sampling module or the first sampling module. The battery cell wire can be blindly plugged into the BMS mainboard where the sampling module is located, but a wire harness can only be connected to one sampling module.

[0054] In this embodiment, the first sampling module is connected to the high wiring harness of the battery module, and the second sampling module is connected to the low wiring harness of the battery module. After the first sampling module collects the cell voltages of 8 strings of high cells through the high wiring harness, it first performs an initial calculation to obtain the first sampling voltage, and then sends the first sampling voltage to the main control module; after the second sampling module collects the cell voltages of 8 strings of low cells through the low wiring harness, it also performs an initial calculation to obtain the second sampling voltage, and then sends the second sampling voltage to the main control module. After receiving the first sampling voltage and the second sampling voltage, the main control module performs a summary calculation process to obtain the voltage sampling result and realize cell sampling.

[0055] Furthermore, the sampling module may include:

[0056] A sampling unit and a slave control unit connected to each other; the sampling unit is connected to any wiring harness of the battery module, and the slave control unit is connected to the main control module;

[0057] The sampling unit is used to collect the cell voltage of the battery module and send the cell voltage to the slave control unit;

[0058] The slave control unit is used to perform initial calculation on the cell voltage, obtain a sampled voltage, and send the sampled voltage to the main control module.

[0059] Furthermore, the sampling unit is connected to the slave control unit via an I2C bus (Inter-Integrated Circuit, a two-wire serial bus, also known as IIC bus), and the slave control unit is connected to the main control module via an SPI bus (Serial Peripheral Interface, a full-duplex synchronous serial bus).

[0060] Specifically, the sampling unit is provided with a cell sampling seat, which is connected to the cell sampling terminal on the battery module. Each sampling module is provided with a sampling unit and a slave control unit. There can be two sampling modules, and correspondingly, there can also be two sampling units, and each sampling unit can be connected to any wiring harness of the battery module.

[0061] In this embodiment, the slave control unit may be a slave MCU, the first sampling module includes a first sampling unit and a first slave MCU, the second sampling module includes a second sampling unit and a second slave MCU, the first sampling unit may be connected to a high wire harness or a low wire harness, and correspondingly, the second sampling unit may be connected to a low wire harness or a high wire harness. In this embodiment, the first sampling unit is connected to the high wire harness, and the second sampling unit is connected to the low wire harness. Specifically, the cell sampling socket on the first sampling unit is connected to the cell sampling terminal on the high wire harness, and the cell sampling socket on the second sampling unit is connected to the cell sampling terminal on the low wire harness. In this embodiment, the first sampling unit collects the first cell voltage of the high cell, and sends the first cell voltage to the first slave MCU, the first slave MCU performs an initial calculation on the first cell voltage, obtains the first sampling voltage, and sends the first sampling voltage to the main MCU; the second sampling unit collects the second cell voltage of the low cell, and sends the second cell voltage to the second slave MCU, the second slave MCU performs an initial calculation on the second cell voltage, obtains the second sampling voltage, and sends the second sampling voltage to the main MCU.

[0062] After collecting the cell voltage of the battery group through the sampling unit, the initial calculation is performed from the control unit, which not only reduces the calculation burden of the main control module, but also eliminates the worry that the sampling unit is connected to the wrong cell wiring harness, causing damage to the main control module.

[0063] The battery cell sampling device provided in the present embodiment arranges two sampling modules on the battery cell sampling device to respectively collect the battery cell voltages of the battery module, and after each of them performs initial calculation to obtain the sampled voltages, they are uniformly sent to the main control module, which summarizes and calculates the two sampled voltages to obtain the voltage sampling results, thereby achieving the goal that the battery cell lines of the battery module can be arbitrarily plugged into any sampling module in the battery cell sampling device, thereby fundamentally solving the problem of requiring one-by-one confirmation for each plug-in, and reducing the workload of producing and assembling battery packs; the adaptability of the device is also increased, and it can be applicable to battery modules including battery cells from multiple different manufacturers or with different parameters.

[0064] Embodiment 2

[0065] Based on the same inventive concept, on the basis of embodiment 1, refer to Figure 2 , a second embodiment of the battery cell sampling device of the present invention is proposed, and the battery cell sampling device is also applied to a battery pack. Figure 2 The connection schematic diagram shown is used to describe the battery cell sampling device of this embodiment in detail.

[0066] Furthermore, the sampling unit includes an analog front-end sampling chip and a cell sampling socket connected to pins of the analog front-end sampling chip.

[0067] Specifically, the sampling unit may adopt an analog front-end sampling chip, a battery cell sampling socket is connected through the pins of the chip, and the battery module is connected to any sampling unit through the battery cell sampling socket and the battery cell sampling terminals of the battery module.

[0068] In this embodiment, the first sampling unit includes a first analog front-end sampling chip and a first battery cell sampling socket, and the second sampling unit includes a second analog front-end sampling chip and a second battery cell sampling socket. The data collected by the analog front-end sampling chip, i.e., the battery cell voltage, is read from the MCU through the I2C bus, and then an initial calculation is performed to obtain the sampled voltage.

[0069] Furthermore, the battery module includes a high battery cell and a low battery cell connected in series, a high battery cell wire arranged on the high battery cell and a low battery cell wire arranged on the low battery cell; the high battery cell wire and the low battery cell wire are connected to any one of the two sampling modules through a battery cell sampling terminal.

[0070] In this embodiment, a first cell sampling terminal is provided on the high cell line, and a second cell sampling terminal is provided on the low cell line. Figure 2 Not shown; the first battery cell sampling terminal can be connected to the first battery cell sampling socket, or it can be connected to the second battery cell sampling socket, and correspondingly, the second battery cell sampling terminal can be connected to the second battery cell sampling socket, or it can be connected to the first battery cell sampling socket. In this embodiment, the high battery cell line is connected to the first battery cell sampling socket, and the low battery cell line is connected to the second battery cell sampling socket. After the first analog front-end sampling chip collects the 8-string battery cell voltage of the high battery cell, it is sent to the first slave MCU to obtain the first sampling voltage. After the second analog front-end sampling chip collects the 8-string battery cell voltage of the low battery cell, it is sent to the second slave MCU to obtain the second sampling voltage.

[0071] For more implementation details in the specific implementation of the above modules or units, please refer to the description of the specific implementation in Example 1. For the sake of brevity of the description, they will not be repeated here.

[0072] The battery cell sampling device provided in this embodiment cooperates with the battery cell sampling terminal of the battery cell line in the battery module and the battery cell sampling socket in the sampling unit. There is no restriction on the corresponding connection and it can be connected arbitrarily. The wiring method of the terminal and the socket is simple and convenient, and it is more convenient for the subsequent production and assembly of battery packs.

[0073] Embodiment 3

[0074] Based on the same inventive concept, on the basis of Embodiment 1 or Embodiment 2, refer to Figure 3 , a third embodiment of the battery cell sampling device of the present invention is proposed, and the battery cell sampling device is also applied to a battery pack. Figure 3The connection schematic diagram shown is used to describe the battery cell sampling device of this embodiment in detail.

[0075] Further, the sampling module further comprises a power supply unit connected to the sampling unit and the slave control unit respectively, and the power supply unit is connected to the battery module;

[0076] The power supply unit is used to supply power to the sampling unit and the slave control unit.

[0077] Specifically, in the sampling module, the sampling unit and the power supply unit are independent. In this embodiment, the first sampling unit further includes a first power supply unit, and the second sampling unit further includes a second power supply unit.

[0078] Furthermore, the power supply unit is provided with a power line terminal and a ground terminal, the power line terminal is connected to the positive electrode of the high battery cell or the low battery cell, and the ground terminal is connected to the negative electrode of the high battery cell or the low battery cell.

[0079] In this embodiment, the high-cell battery has 8 cells connected in series, and the low-cell battery also has 8 cells connected in series. Figure 3 In the battery cell group shown, the negative pole of the last battery cell of the high battery cell is connected to the positive pole of the first battery cell of the low battery cell. It should be noted that the first and the last are counted from top to bottom as shown in the figure. Among them, the negative pole of the last battery cell of the high battery cell and the positive pole of the first battery cell of the low battery cell are equivalent to a connection point. The power line terminal of the first power supply unit is connected to the positive pole of the first battery cell of the high battery cell through a wire, and the ground terminal of the first power supply unit is connected to the negative pole of the last battery cell of the high battery cell through a wire. The power line terminal of the second power supply unit is connected to the positive pole of the first battery cell of the low battery cell through a wire, and the ground terminal of the first power supply unit is connected to the negative pole of the last battery cell of the low battery cell through a wire.

[0080] The cell sampling device provided in this embodiment has an independent power supply unit corresponding to each sampling module, which solves the power supply problem of the analog front-end sampling chip and the slave MCU, and facilitates subsequent maintenance and troubleshooting.

[0081] For more implementation details in the specific implementation of the above modules or units, please refer to the description of the specific implementation in Example 1 or Example 2. For the sake of brevity of the description, they will not be repeated here.

[0082] Embodiment 4

[0083] Based on the same inventive concept, Figure 4 , a first embodiment of the cell sampling method of the present invention is proposed, and the method is applied to the cell sampling device provided in any of the above-mentioned embodiments 1 to 3. Figure 4The flowchart shown in the figure describes in detail the cell sampling method provided in this embodiment, and the method may include:

[0084] Step S1: The sampling module collects the cell voltage of the battery module, performs initial calculation, obtains the sampled voltage, and sends the sampled voltage to the main control module;

[0085] Step S2: The main control module aggregates and calculates the sampled voltages sent by the two sampling modules to obtain voltage sampling results.

[0086] Furthermore, the step S1 may include:

[0087] Step S1.1: The sampling unit collects the cell voltage of the battery module and sends the cell voltage to the slave control unit;

[0088] Step S1.2: The control unit performs an initial calculation on the cell voltage to obtain a sampled voltage, and sends the sampled voltage to the main control module.

[0089] Furthermore, before step S1.1, the method further includes:

[0090] Step S1.0: The power supply unit supplies power to the sampling unit and the slave control unit.

[0091] It should be noted that the specific structure, connection relationship and corresponding technical effects of each module or unit involved in the battery cell sampling method provided in this embodiment can refer to the description of the specific implementation methods in each embodiment of the battery cell sampling device of the present invention. For the sake of brevity of the specification, they will not be repeated here.

[0092] Embodiment 5

[0093] Based on the same inventive concept, this embodiment provides a battery management system, the system comprising:

[0094] The cell sampling device provided in any of the above embodiments 1 to 3 is used to collect the cell voltage of the battery module to obtain the voltage sampling result;

[0095] The battery management control device is used to generate a battery management control instruction according to the voltage sampling result to control the battery module.

[0096] It should be noted that the specific structure, connection relationship and corresponding technical effects of the battery cell sampling device in the battery management system provided in this embodiment can refer to the description of the specific implementation methods in each embodiment of the battery cell sampling device of the present invention. For the sake of brevity of the specification, they will not be repeated here.

[0097] Embodiment 6

[0098] Based on the same inventive concept, this embodiment provides a battery pack, the battery pack comprising:

[0099] Battery module;

[0100] A BMS mainboard connected to the battery module; the BMS mainboard is provided with a battery management system as described in the fifth embodiment.

[0101] The battery pack provided in this embodiment does not need to determine whether the cell sampling terminals on the cell lines in the battery module correspond one-to-one with the cell sampling sockets on the BMS mainboard during production and assembly, thereby preventing damage to the BMS mainboard due to incorrect insertion of the cell sampling terminals and the cell sampling sockets.

[0102] It should be noted that the serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structures or equivalent process changes made by using the contents of the present specification and drawings under the inventive concept of the present invention, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A battery cell sampling device, the device being connected to a battery module, characterized in that: The device includes a main control module; Two sampling modules connected to the main control module; the two sampling modules are connected to the battery module; The sampling module is used to collect the cell voltage of the battery module, perform initial calculation, obtain the sampled voltage, and send the sampled voltage to the main control module; The main control module is used to summarize and calculate the sampled voltages sent by the two sampling modules to obtain a voltage sampling result; The battery module includes a high cell and a low cell connected in series, and a high cell line arranged on the high cell and a low cell line arranged on the low cell, wherein the high cell includes a plurality of cells connected in series, and the low cell includes a plurality of cells connected in series; The sampling module includes a sampling unit and a slave control unit connected to each other, the sampling unit is connected to any wiring harness of the battery module, and the slave control unit is connected to the main control module; the any wiring harness is a high wiring harness or a low wiring harness, the high wiring harness is a wiring harness formed by the high-battery core wires, and the low wiring harness is a wiring harness formed by the low-battery core wires; The sampling unit is used to collect the cell voltage of the high cell or the low cell and send the cell voltage to the slave control unit; The slave control unit is used to perform initial calculation on the cell voltage, obtain a sampled voltage, and send the sampled voltage to the main control module.

2. The battery cell sampling device according to claim 1, characterized in that: The sampling unit comprises an analog front-end sampling chip and a cell sampling socket connected to pins of the analog front-end sampling chip.

3. The battery cell sampling device according to claim 1, characterized in that: The sampling module further comprises a power supply unit connected to the sampling unit and the slave control unit respectively, and the power supply unit is connected to the battery module; The power supply unit is used to supply power to the sampling unit and the slave control unit.

4. The battery cell sampling device according to claim 3, characterized in that: The high-battery core line and the low-battery core line are connected to any one of the two sampling modules through a battery sampling terminal.

5. The battery cell sampling device according to claim 4, characterized in that: The power supply unit is provided with a power line terminal and a ground terminal, the power line terminal is connected to the positive electrode of the high battery cell or the low battery cell, and the ground terminal is connected to the negative electrode of the high battery cell or the low battery cell.

6. The battery cell sampling device according to claim 1, characterized in that: The sampling unit is connected to the slave control unit via an I2C bus, and the slave control unit is connected to the main control module via an SPI bus.

7. A cell sampling method, characterized in that: The method is applied to the battery cell sampling device according to any one of claims 1 to 6, and the method comprises: The sampling module collects the cell voltage of the battery module, performs initial calculation, obtains the sampled voltage, and sends the sampled voltage to the main control module; The main control module summarizes and calculates the sampled voltages sent by the two sampling modules to obtain the voltage sampling results; The battery module includes a high cell and a low cell connected in series, and a high cell wire arranged on the high cell and a low cell wire arranged on the low cell, the high cell includes a plurality of cells connected in series, and the low cell includes a plurality of cells connected in series; the sampling module includes a sampling unit and a slave control unit connected to each other, the sampling unit is connected to any wiring harness of the battery module, and the slave control unit is connected to the main control module; the any wiring harness is a high wiring harness or a low wiring harness, the high wiring harness is a bundle of wiring harnesses formed by the high cell wires, and the low wiring harness is a bundle of wiring harnesses formed by the low cell wires; the sampling module collects the cell voltage of the battery module, performs initial calculation, obtains the sampled voltage, and sends the sampled voltage to the main control module, including: Collecting the cell voltage of the high cell or the low cell by the sampling unit, and sending the cell voltage to the slave control unit; The slave control unit performs an initial calculation on the cell voltage to obtain a sampled voltage, and sends the sampled voltage to the main control module.

8. A battery management system, characterized in that: The system comprises: The cell sampling device according to any one of claims 1 to 6, used to collect the cell voltage of the battery module to obtain a voltage sampling result; The battery management control device is used to generate a battery management control instruction according to the voltage sampling result to control the battery module.

9. A battery pack, characterized in that: The battery pack comprises: Battery module; A BMS mainboard connected to the battery module; the BMS mainboard is provided with the battery management system as claimed in claim 8.

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