Central adapter plate and battery voltage sampling equipment and system

Abstract

The utility model discloses a central adapter plate, a battery voltage sampling device and a battery voltage sampling system, and relates to the technical field of voltage acquisition. The sampling port is used for accessing single batteries of the battery pack to be tested; a first output port and a second output port, the first output port is connected with the voltage acquisition instrument, the second output port is connected with the BMS, and the sampling port is electrically connected with the first output port and the second output port through printed conductors of the circuit board; wherein the sampling port receives a voltage sampling signal of each single battery in the battery pack and transmits the voltage sampling signal to the first output port and the second output port so as to output the voltage sampling signal to the voltage acquisition instrument and output the voltage sampling signal to the BMS from the second output port. According to the technical scheme provided by the utility model, the test efficiency of voltage acquisition precision detection of the BMS can be improved, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage acquisition, in particular to a central adapter board, battery voltage sampling equipment and a system. Background Art

[0002] Battery voltage is one of the most important parameters for battery operation. In all battery testing items, the battery cell voltage and total voltage of the test item must be clearly defined. The main reason is that battery voltage plays a decisive role in the impact on battery performance, including the battery's internal resistance, charging performance, discharging performance, service life, self-discharge, safety and many other aspects. Therefore, voltage acquisition accuracy is an important performance indicator of the BMS (Battery Management System). However, under existing technical conditions, BMS manufacturers generally use the method of installing additional sampling cables when testing voltage acquisition accuracy. Although this approach can obtain voltage data, it has significant limitations and shortcomings: First, the test time cost is high: each voltage acquisition accuracy test requires the test module to be disassembled to connect to the sampling cable. After the test is completed, the sampling cable must be removed and the module restored. This process is cumbersome and time-consuming, significantly increasing the test time cost. Second, the test efficiency is low: in addition to the time spent on disassembling and restoring the module, each installation and removal of the sampling harness also requires repeated operation of the module, which not only prolongs the single test cycle but also reduces the efficiency of the overall test process, which is particularly disadvantageous for large-scale production testing. Third, it increases product cost: if test sampling ports are reserved in the product design for testing convenience, while it can simplify the testing process, it will directly increase the product's manufacturing cost, thereby affecting the product's market competitiveness. Especially in cost-sensitive market environments, this additional cost is often unacceptable to companies.

[0003] Therefore, the existing technology for detecting the voltage acquisition accuracy of the BMS has problems such as long testing time, low efficiency and high cost. How to improve the testing efficiency of the voltage acquisition accuracy detection of the BMS and reduce the manufacturing cost is an urgent problem to be solved. Utility Model Content

[0004] The main purpose of this utility model is to propose a central adapter board, a battery voltage sampling device and a system, aiming to solve the problem of how to improve the test efficiency of the voltage acquisition accuracy detection of the BMS and reduce the manufacturing cost.

[0005] To achieve the above-mentioned purpose, the central adapter plate proposed in the present invention includes:

[0006] circuit boards;

[0007] Sampling port, used to connect to the battery cells of the battery pack to be tested;

[0008] A first output port and a second output port, wherein the first output port is connected to a voltage acquisition instrument, and the second output port is connected to a BMS, and the sampling port is electrically connected to the first output port and the second output port respectively through printed conductors of the circuit board; wherein the sampling port receives a voltage sampling signal of each battery cell in the battery pack, transmits it to the first output port and the second output port, so as to output the voltage sampling signal to the voltage acquisition instrument, and outputs the voltage sampling signal to the BMS via the second output port.

[0009] In one embodiment, the sampling port comprises:

[0010] at least two first module sampling terminals, each of which is connected to a plurality of battery cells in the battery pack; and

[0011] At least two second module sampling terminals, each of which is connected to a plurality of battery cells in the battery pack.

[0012] In one embodiment, the central adapter plate further includes:

[0013] at least two first battery voltage collection terminals, wherein multiple input terminals of the first battery voltage collection terminals are connected one-to-one with a portion of the battery cells in the battery pack, and the output terminal of each first battery voltage collection terminal is connected to a first module sampling terminal, and the first battery voltage collection terminals are used to sample the voltages of the multiple battery cells and output voltage sampling signals to the first module sampling terminal; and

[0014] At least two second battery voltage collection terminals, multiple input terminals of the second battery voltage collection terminals are respectively connected one-to-one with another part of the battery cells in the battery pack, and the output terminal of each second battery voltage collection terminal is correspondingly connected with a second module sampling terminal, and the second battery voltage collection terminal is used to sample the voltages of the multiple battery cells respectively and output voltage sampling signals to the second module sampling terminal.

[0015] In one embodiment, the central adapter plate further includes:

[0016] An acquisition harness, wherein the input end of the acquisition harness is connected to the first output port, and the output end of the acquisition harness is connected to the voltage acquisition instrument, and is used to transmit the voltage sampling signal output by the first output port to the voltage acquisition instrument.

[0017] In one embodiment, the BMS includes a BMS voltage collection terminal, and the second output port is connected to the BMS voltage collection terminal of the BMS.

[0018] The present invention further provides a battery voltage sampling device, which is applied to a BMS and a voltage acquisition instrument to collect voltage from a battery pack. The battery voltage sampling device includes: the central adapter board as described above.

[0019] The present invention also provides a battery voltage sampling system, which includes: a battery pack, a voltage acquisition instrument, a BMS and the battery voltage sampling device as described above.

[0020] In one embodiment, the voltage acquisition instrument is used to compare and verify the voltage acquisition data of the BMS.

[0021] The technical solution of the present invention adopts a central adapter plate to receive the battery voltage sampling signal in the battery pack through the sampling port, and transfers it into two outputs through the first output port and the second output port, so that the voltage acquisition instrument and the BMS can receive the battery voltage sampling signal at the same time, without the need to disassemble and reassemble the test module and the acquisition line. The test process is greatly simplified, the test time cost is significantly reduced, and the test efficiency is improved. In addition, the dual output ports of the central adapter plate of this solution save the cost of reserving the test sampling port and reduce the manufacturing cost of the product. In summary, the central adapter plate provided by the present invention improves the test efficiency of the voltage acquisition accuracy detection of the BMS and reduces the manufacturing cost of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the module structure of an embodiment of a central adapter plate provided by the present utility model;

[0024] Figure 2 A schematic diagram of the module structure of an embodiment of a central adapter plate provided by the present utility model;

[0025] Figure 3 This is a schematic diagram of the circuit structure of the sampling port of an embodiment of the central adapter board provided by the present invention;

[0026] Figure 4 A schematic diagram of the module structure of an embodiment of a central adapter plate provided by the present utility model;

[0027] Description of Figure Numbers:

[0028] 10. Circuit board; 20. Sampling port; 21. First module sampling port; 22. Second module sampling port; A. First module voltage sampling port; B. Second module voltage sampling port; C. Third module voltage sampling port; D. Fourth module voltage sampling port; a. First battery voltage sampling terminal; b. Second battery voltage sampling terminal; c. Third battery voltage sampling terminal; d. Fourth battery voltage sampling terminal; 30. First output port; 40. Second output port;

[0029] e. BMS voltage collection terminal.

[0030] 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

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments 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 mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Battery voltage is one of the most important parameters for battery operation. In all battery testing items, the battery cell voltage and total voltage of the test item must be clearly defined. The main reason is that battery voltage plays a decisive role in the impact on battery performance, including the battery's internal resistance, charging performance, discharge performance, service life, self-discharge, safety and many other aspects. Therefore, voltage acquisition accuracy is an important performance indicator of the battery management system (BMS). However, under existing technical conditions, BMS manufacturers generally use the method of installing additional sampling cables when testing voltage acquisition accuracy. Although this approach can obtain voltage data, it has significant limitations and shortcomings: First, the test time cost is high: each voltage acquisition accuracy test requires the test module to be disassembled to connect to the sampling cable. After the test is completed, the sampling cable must be removed and the module restored. This process is cumbersome and time-consuming, significantly increasing the test time cost. Second, the test efficiency is low: in addition to the time spent on disassembling and restoring the module, each installation and removal of the sampling harness also requires repeated operation of the module, which not only prolongs the single test cycle but also reduces the efficiency of the overall test process, which is particularly disadvantageous for large-scale production testing. Third, it increases product cost: if test sampling ports are reserved in the product design for testing convenience, while it can simplify the testing process, it will directly increase the product's manufacturing cost, thereby affecting the product's market competitiveness. Especially in cost-sensitive market environments, this additional cost is often unacceptable to companies.

[0035] Therefore, the existing technology for detecting the voltage acquisition accuracy of the BMS has problems such as long testing time, low efficiency and high cost. How to improve the testing efficiency of the voltage acquisition accuracy detection of the BMS and reduce the manufacturing cost is an urgent problem to be solved.

[0036] Based on this, the utility model proposes a central adapter plate, which is used for BMS and voltage acquisition instruments to collect the voltage of the battery pack.

[0037] It should be noted that a BMS is an electronic system used to monitor and manage the status of each battery cell in a battery pack. BMS is widely used in various fields such as electric vehicles, energy storage systems, drones, and portable electronic devices. Voltage acquisition accuracy is an important performance indicator of a battery management system (BMS). The voltage acquisition instrument can be a voltage acquisition instrument with a high-precision voltage acquisition function, such as a paperless recorder, but this embodiment does not limit this. Since the voltage acquisition accuracy of the voltage acquisition instrument is higher than that of the BMS, the voltage acquisition results of the voltage acquisition instrument are compared and verified with the voltage acquisition results of the BMS, and the voltage acquisition error of the BMS is confirmed by comparison on the same time axis, thereby achieving the purpose of testing the voltage acquisition accuracy of the BMS.

[0038] See also Figure 1In one embodiment of the present invention, the central adapter plate includes:

[0039] Circuit board 10;

[0040] Sampling port 20, used to connect to the battery cells of the battery pack to be tested;

[0041] A first output port 30 and a second output port 40, wherein the first output port 30 is connected to a voltage acquisition instrument, and the second output port 40 is connected to a BMS, and the sampling port 20 is electrically connected to the first output port 30 and the second output port 40 respectively through printed conductors of the circuit board 10; wherein the sampling port 20 receives a voltage sampling signal of each battery cell in the battery pack, transmits it to the first output port 30 and the second output port 40, so as to output the voltage sampling signal to the voltage acquisition instrument, and outputs the voltage sampling signal to the second output port 40 to the BMS.

[0042] It should be noted that the circuit board 10 is a PCB, specifically a one-to-two PCB that can expand a single input signal into two output signals. In this embodiment, the sampling port 20, the first output port 30, and the second output port 40 are all disposed on the circuit board 10. Printed conductors on the circuit board 10 connect the sampling port 20 to the first output port 30 and the second output port 40, respectively. This expands the voltage sampling signal received by the sampling port 20 into two outputs: output to a voltage acquisition instrument via the first output port 30 and output to a BMS via the second output port 40.

[0043] The technical solution of the present invention adopts a central adapter board, which receives the battery voltage sampling signal in the battery pack through the sampling port 20 on the circuit board, and switches it into two outputs through the first output port 30 and the second output port 40, so that the voltage acquisition instrument and the BMS can receive the battery voltage sampling signal at the same time, without the need to disassemble and reassemble the test module and the acquisition line. The test process is greatly simplified, the test time cost is significantly reduced, and the test efficiency is improved. This solution is easy to operate and easy to promote, and is especially suitable for battery management system production line testing; the dual output ports of the central adapter board of this solution save the cost of reserving the test sampling port 20, and the design structure is simple, easy to maintain, and reduces the manufacturing and maintenance costs of the product. In summary, the central adapter board provided by the present invention improves the test efficiency of the voltage acquisition accuracy detection of the BMS and reduces the manufacturing and maintenance costs of the product.

[0044] In another embodiment, the first output port 30 and the second output port 40 are ports of the same model and specifications. Both output ports can be connected to the BMS and also to the voltage acquisition instrument, so that the voltage acquisition circuit can be flexibly adjusted according to actual needs, thereby improving the scalability and adaptability of the central adapter board.

[0045] Please refer to Figure 2 In one embodiment of the present invention, the sampling port 20 includes:

[0046] At least two first module sampling terminals 21, each of which is connected to a plurality of battery cells in the battery pack; and

[0047] At least two second module sampling terminals 22 , each of which is connected to a plurality of battery cells in the battery pack.

[0048] It should be noted that the battery cells in the battery pack are arranged in series. The first module sampling terminal 21 and the second module sampling terminal 22 can be two different multi-pin ports with different numbers of pins, and the number of connected battery cells is also different. The pin specifications and number of the first module sampling terminal 21 and the second module sampling terminal 22 should be designed and selected according to the specific application scenario, and this embodiment does not specifically limit this. Each pin of the first module sampling terminal 21 and the second module sampling terminal 22 is connected to the sampling line extending from the series terminal between the positive and negative electrodes of the battery cell.

[0049] In one embodiment of the present invention, the central adapter plate further includes:

[0050] at least two first battery voltage collection terminals, wherein multiple input terminals of the first battery voltage collection terminals are connected one-to-one with a portion of the battery cells in the battery pack, and the output terminal of each first battery voltage collection terminal is connected to a first module sampling terminal 21, and the first battery voltage collection terminal is used to sample the voltages of the multiple battery cells and output voltage sampling signals to the first module sampling terminal 21; and

[0051] At least two second battery voltage collection terminals, multiple input terminals of the second battery voltage collection terminals are respectively connected one-to-one with another part of the battery cells in the battery pack, and the output terminal of each second battery voltage collection terminal is correspondingly connected with a second module sampling terminal 22. The second battery voltage collection terminal is used to sample the voltages of the multiple battery cells respectively and output voltage sampling signals to the second module sampling terminal 22.

[0052] It should be noted that the first module acquisition terminal samples and detects the voltage of the battery cell via the first battery voltage acquisition terminal, and the second module acquisition terminal samples and detects the voltage of the battery cell via the second module acquisition terminal. The battery voltage acquisition terminals correspond one-to-one with the corresponding module sampling terminals and are the same in number. The specific number and specifications of the first module acquisition terminal, the second module acquisition terminal, the first module acquisition terminal, and the second module acquisition terminal should be selected based on the number of battery cells in the battery pack and are not specifically limited in this embodiment.

[0053] As an example, see Figure 3 The first module sampling terminal 21 is a four-pin port, and the second module sampling terminal 22 is a six-pin port. The first battery voltage acquisition terminal includes four input terminals and four output terminals, and the second battery voltage acquisition terminal includes six input terminals and six output terminals. Therefore, the first module sampling terminal 21 is connected to three battery cells through the first battery voltage acquisition terminal. The first module sampling terminal 21 can receive voltage sampling signals from three battery cells respectively, and the second module sampling terminal can sample voltage signals from five battery cells respectively.

[0054] In this embodiment, by providing two sampling terminals with different numbers of pins, an asymmetric interface structure is formed on the sampling port 20. This ensures that the sampling port 20 can only be connected to the sampling terminal in the correct manner, thus achieving hardware foolproofing for the sampling port 20. This not only improves the usability and user experience of the central adapter board, reducing the possibility of user errors, but also enhances the safety and reliability of the central adapter board, reducing the risk of device damage and test failure caused by incorrect insertion and removal.

[0055] See also Figure 4 In one embodiment of the present invention, the central adapter plate further includes:

[0056] A collection harness, the input end of which is connected to the first output port 30 , and the output end of which is connected to the voltage collection instrument, for transmitting the voltage sampling signal outputted from the first output port 30 to the voltage collection instrument.

[0057] It should be noted that the collection harness is a fixed and dedicated harness that connects the collection end of the voltage collection instrument and the first output port 30 of the central adapter board. The specific specifications and parameters of the collection harness should be selected according to the collection end of the voltage collection instrument, and this embodiment does not make specific restrictions on this.

[0058] In this embodiment, the output port of the central adapter board is connected to the voltage acquisition instrument through a dedicated acquisition harness, so that the voltage acquisition instrument does not need to be assembled with different harnesses according to different battery packs for voltage sampling. The central adapter board of this embodiment simplifies the assembly and disassembly steps of the harness between the voltage acquisition instrument and the battery pack during the test process, and is applicable to the sampling of multiple different types of battery pack products.

[0059] See also Figure 4 In one embodiment of the present invention, the BMS includes a voltage collection terminal, and the second output port 40 is connected to the voltage collection terminal of the BMS.

[0060] It should be noted that the second output port 40 of the central adapter board of this embodiment is connected to the voltage collection terminal of the BMS and is compatible with the voltage collection terminals of different types of BMSs, so as to be applicable to voltage collection of various types of BMSs.

[0061] In another embodiment, the output port of the central adapter board of this embodiment is compatible with the sampling terminal of this device. When extended connection is required, multiple sampling ports 20 of the central adapter board of this embodiment can be connected in series with the output port to serve as an extended connection hub for voltage collection. This allows the voltage collection circuit to be flexibly adjusted according to actual needs, improving the scalability and adaptability of the central adapter board.

[0062] For example, in order to help understand the technical concept or technical principle of the noise optimization circuit after combining this embodiment with the above embodiments, please refer to Figure 4 , Figure 4 A schematic diagram of the central adapter plate structure is provided, as follows:

[0063] This central adapter board can sample the voltage of a battery pack containing up to sixteen battery cells. The number of battery cells in the battery pack can be any integer between one and sixteen, and this embodiment does not impose any specific limitations on this. The sampling port 20 includes two first module acquisition terminals: a first module voltage sampling terminal A and a fourth module voltage sampling terminal D, and two second module acquisition terminals: a second module voltage sampling terminal B and a third module voltage sampling terminal C. It also includes two first module acquisition terminals: a first battery voltage acquisition terminal a and a fourth battery voltage acquisition terminal d, and two second module acquisition terminals: a second battery voltage acquisition terminal b and a third battery voltage acquisition terminal c. The voltage acquisition instrument is a paperless recorder. The first battery voltage acquisition terminals a through d are correspondingly connected to the first module voltage sampling terminals A through D. The first output port 30 is connected to the paperless recorder via a acquisition harness, and the second output port 40 is connected to the BMS via the BMS voltage acquisition terminal e.

[0064] The first module voltage sampling terminal A receives voltage sampling signals from the first through third battery cells in the battery pack via the first battery voltage acquisition terminal a. The second module voltage sampling terminal B receives voltage sampling signals from the fourth through eighth battery cells in the battery pack via the second battery voltage acquisition terminal b. The third module voltage sampling terminal C receives voltage sampling signals from the ninth through thirteenth battery cells in the battery pack via the third battery voltage acquisition terminal c. The fourth module voltage sampling terminal D receives voltage sampling signals from the fourteenth through sixteenth battery cells in the battery pack via the fourth battery voltage acquisition terminal d. The first output port 30 outputs the voltage sampling signals of each battery cell in the battery pack to the paperless recorder via the acquisition wiring harness. Simultaneously, the second output port 40 outputs the voltage sampling signals of each battery cell in the battery pack to the BMS via the BMS's voltage acquisition terminal e. This allows the paperless recorder to compare and verify voltage data collected on the same timeline with the BMS, confirming any errors in the BMS voltage acquisition. This not only completes the BMS's voltage acquisition of each battery cell in the battery pack, but also tests the BMS's voltage acquisition accuracy.

[0065] The present invention also proposes a battery voltage sampling device, which is used for BMS and voltage acquisition instruments to collect the voltage of a battery pack. The battery voltage sampling device includes a central adapter board as described in any one of the above embodiments. The specific structure of the central adapter board refers to the above embodiments. Since the battery voltage sampling device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0066] The present invention also provides a battery voltage sampling system, which includes: a battery pack, a voltage acquisition instrument, a BMS, and the battery voltage sampling device as described in the above embodiments. The specific structure of the battery voltage sampling device refers to the above embodiments. Since the power supply system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0067] In one embodiment of the present invention, the voltage acquisition instrument is used to perform a comparative test on the voltage acquisition accuracy of the BMS.

[0068] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A central adapter plate, characterized in that: include: circuit boards; Sampling port, used to connect to the battery cells of the battery pack to be tested; A first output port and a second output port, wherein the first output port is connected to a voltage acquisition instrument, and the second output port is connected to a BMS, and the sampling port is electrically connected to the first output port and the second output port respectively through printed conductors of the circuit board; wherein the sampling port receives a voltage sampling signal of each battery cell in the battery pack, transmits it to the first output port and the second output port, so as to output the voltage sampling signal to the voltage acquisition instrument, and outputs the voltage sampling signal to the BMS via the second output port.

2. The central adapter plate according to claim 1, characterized in that: The sampling port includes: at least two first module sampling terminals, each of which is connected to a plurality of battery cells in the battery pack; and At least two second module sampling terminals, each of which is connected to a plurality of battery cells in the battery pack.

3. The central adapter plate according to claim 2, wherein: The central adapter plate also includes: at least two first battery voltage collection terminals, wherein multiple input terminals of the first battery voltage collection terminals are connected one-to-one with a portion of the battery cells in the battery pack, and the output terminal of each first battery voltage collection terminal is connected to a first module sampling terminal, and the first battery voltage collection terminals are used to sample the voltages of the multiple battery cells and output voltage sampling signals to the first module sampling terminal; and At least two second battery voltage collection terminals, multiple input terminals of the second battery voltage collection terminals are respectively connected one-to-one with another part of the battery cells in the battery pack, and the output terminal of each second battery voltage collection terminal is correspondingly connected with a second module sampling terminal, and the second battery voltage collection terminal is used to sample the voltages of the multiple battery cells respectively and output voltage sampling signals to the second module sampling terminal.

4. The central adapter plate according to claim 1, wherein: The central adapter plate also includes: An acquisition harness, wherein the input end of the acquisition harness is connected to the first output port, and the output end of the acquisition harness is connected to the voltage acquisition instrument, and is used to transmit the voltage sampling signal output by the first output port to the voltage acquisition instrument.

5. The central adapter plate according to claim 1, wherein: The BMS includes a BMS voltage collection terminal, and the second output port is connected to the BMS voltage collection terminal of the BMS.

6. A battery voltage sampling device, characterized in that: Applicable to BMS and voltage acquisition instruments for voltage acquisition of battery packs, the battery voltage sampling device comprises: a central adapter board as claimed in any one of claims 1 to 5.

7. A battery voltage sampling system, characterized in that: The battery voltage sampling system includes: a battery pack, a voltage acquisition instrument, a BMS and the battery voltage sampling device according to claim 6.

8. The battery voltage sampling system according to claim 7, wherein: The voltage acquisition instrument is used to compare and verify the voltage acquisition data of the BMS.

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