Detection circuit and method of battery pack voltage measurement module and battery management system

Abstract

The invention relates to a detection circuit and method of a battery pack voltage measurement module and a battery management system, and relates to the technical field of power management. The detection circuit comprises a first sampling unit and a processor. Wherein the first sampling unit is connected with a battery pack and is used for providing multiple paths of standard voltages based on the total output of the battery pack; and the processor is used for acquiring a first conversion result obtained by converting the standard voltage by the plurality of voltage measurement modules, and generating a detection result based on the first conversion result. Therefore, multiple paths of standard voltages are obtained through the first sampling unit based on the total output of the battery pack, the conversion results of the multiple paths of standard voltages by the multiple voltage measurement modules are analyzed by the processor, and the abnormal voltage measurement module can be positioned without arranging redundant voltage measurement modules, so that the detection result is generated, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of power management technology, and in particular to a detection circuit and method for a battery pack voltage measurement module and a battery management system. Background Art

[0002] With the development of electric vehicles, energy storage systems and smart electronic devices, the safety, stability and performance of battery packs as their core energy supply have become particularly important. Battery Management System (BMS) is a key technology to ensure the normal operation of battery packs and extend battery life. The voltage measurement module used to monitor the real-time output of battery packs is an important part of the battery management system.

[0003] At present, in the battery management system, each single cell of the battery pack is equipped with its own independent voltage measurement module, such as an analog-to-digital converter (ADC). In order to further improve the stability of the battery pack output monitoring, each single cell is also equipped with a redundant voltage measurement module. The redundant voltage measurement module and the main voltage measurement module simultaneously collect the voltage of each single cell, and calculate and compare the data of the two to detect whether the voltage measurement module function fails.

[0004] However, configuring redundant voltage measurement modules will greatly increase costs. How to reduce the cost of battery management systems is an urgent problem to be solved. Summary of the invention

[0005] The embodiment of the present application provides a detection circuit of a battery pack voltage measurement module, which reduces the cost of a battery management system and at least partially solves the above-mentioned technical problems.

[0006] In order to achieve the above object, according to a first aspect of the present application, a detection circuit of a battery pack voltage measurement module is provided, comprising:

[0007] A first sampling unit, connected to the battery pack, for providing a plurality of standard voltages based on the total output of the battery pack;

[0008] The processor is used to obtain first conversion results obtained by converting the standard voltage by multiple voltage measurement modules respectively, and generate a detection result based on the first conversion results.

[0009] Optionally, also include:

[0010] A second sampling unit, connected to each single cell in the battery pack, for sampling the output voltage of each single cell;

[0011] The processor is further configured to obtain second conversion results obtained by converting the output voltage by the plurality of voltage measurement modules respectively, and generate the detection result based on the first conversion result and the second conversion result.

[0012] Optionally, the first sampling unit includes a plurality of first resistors sequentially connected in series between the battery pack and the ground, and the standard voltage is obtained based on a voltage difference across each of the first resistors.

[0013] Optionally, the resistance values ​​of the first resistors are equal.

[0014] Optionally, a switch unit is further included, and the switch unit is arranged in series between the battery pack and the first sampling unit to control the connection between the battery pack and the first sampling unit.

[0015] Optionally, the second sampling unit includes a second resistor and a third resistor;

[0016] The second resistor includes a first end and a second end connected to the positive electrode of the single cell;

[0017] The third resistor includes a first end and a second end connected to the negative electrode of the single cell;

[0018] The output voltage is obtained based on a voltage difference between a first end of the second resistor and a first end of the third resistor.

[0019] Optionally, a differential voltage conversion unit connected to the first sampling unit, the second sampling unit and the voltage measurement module is further included, which is used to convert the standard voltage and the output voltage into relative analog quantities and output them to the voltage measurement module.

[0020] According to a second aspect of the present application, a method for detecting a battery pack voltage measurement module is provided, comprising:

[0021] Acquire a first conversion result obtained by converting multiple standard voltages respectively by multiple voltage measurement modules; wherein the standard voltage is obtained based on the total output of the battery pack;

[0022] A detection result is generated based on the first conversion result.

[0023] Optionally, generating a detection result based on the first conversion result includes:

[0024] It is determined whether the plurality of first conversion results are equal to each other within a preset error range. If so, it is determined that the voltage measurement module is normal; if not, it is determined that the voltage measurement module is abnormal.

[0025] Optionally, also include:

[0026] Acquire a second conversion result obtained by converting the output voltage by the plurality of voltage measurement modules respectively; wherein the output voltage is obtained by sampling the output of each single cell in the battery pack;

[0027] The detection result is obtained based on the first conversion result and the second conversion result.

[0028] Optionally, obtaining the detection result based on the first conversion result and the second conversion result includes:

[0029] Determine whether the superposition value of the first conversion result and the superposition value of the second conversion result are equal within a preset error range; if so, determine that the voltage measurement module is normal; if not, determine that the voltage measurement module is abnormal.

[0030] Optionally, after determining that the voltage measurement module is abnormal, the method further includes:

[0031] determining a target conversion result based on a plurality of the first conversion results;

[0032] Based on the target conversion result, a module identification of the abnormal voltage measurement module is determined.

[0033] Optionally, also include:

[0034] Using a second conversion result obtained by the normal voltage measurement module as the first monomer output voltage;

[0035] Based on the target conversion result, generating an actual total output voltage of the battery pack;

[0036] The abnormal second cell output voltage of the voltage measurement module is generated based on the actual total output voltage and the first cell output voltage.

[0037] According to a third aspect of the present application, the present application provides a battery management system, comprising a detection circuit of the above-mentioned battery pack voltage measurement module.

[0038] In the detection circuit of the battery pack voltage measurement module of the embodiment of the present application, a plurality of standard voltages are obtained based on the total output of the battery pack through the first sampling unit, and the conversion results of the plurality of standard voltages by the plurality of voltage measurement modules are analyzed by the processor. Abnormal voltage measurement modules can be located without setting up redundant voltage measurement modules, thereby generating detection results and reducing costs.

[0039] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0041] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0042] Figure 1 is a block diagram of a detection circuit of a battery pack voltage measurement module provided in an exemplary embodiment of the present disclosure;

[0043] Figure 2 is a block diagram of a detection circuit of another battery pack voltage measurement module provided in an exemplary embodiment of the present disclosure;

[0044] Figure 3 is a schematic diagram of the connection structure of a detection circuit of a battery pack voltage measurement module provided in an exemplary embodiment of the present disclosure;

[0045] Figure 4 is a flow chart of a detection method of a battery pack voltage measurement module provided in an exemplary embodiment of the present disclosure;

[0046] Figure 5 is a flow chart of another method for detecting a battery pack voltage measurement module provided in an exemplary embodiment of the present disclosure;

[0047] Figure 6 is a flow chart of a method for generating a single cell voltage output voltage provided in an exemplary embodiment of the present disclosure.

[0048] Explanation of the reference numerals: 1. first sampling unit; 2. processor; 3. second sampling unit; 4. switch unit; 5. differential voltage conversion unit. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0050] According to the first aspect of the present application, referring to Figures 1 to 3 The present disclosure provides a detection circuit of a battery pack voltage measurement module, including a first sampling unit 1 and a processor 2.

[0051] Among them, the first sampling unit 1 is connected to the battery pack and is used to provide multiple standard voltages based on the total output of the battery pack; the processor 2 is used to obtain first conversion results obtained by multiple voltage measurement modules respectively converting the standard voltages, and generate detection results based on the first conversion results.

[0052] The voltage measurement module may be an analog-to-digital conversion chip (ADC), and the voltage measurement module may be used to convert the standard voltage of the analog quantity into a first conversion result of the digital quantity, so as to facilitate subsequent processing by the processor 2. As an example, the conversion error of the voltage detection module may come from various factors such as nonlinear distortion, clock jitter, unstable reference voltage, electromagnetic interference and noise, and hardware failure.

[0053] In the above implementation, a plurality of standard voltages are obtained based on the total output of the battery pack by the first sampling unit 1, and the conversion results of the plurality of standard voltages by the plurality of voltage measurement modules are analyzed by the processor 2. Abnormal voltage measurement modules can be located without setting up redundant voltage measurement modules, thereby generating detection results and reducing costs.

[0054] Reference Figure 2 In some embodiments, the detection circuit of the battery pack voltage measurement module further includes a second sampling unit 3. The second sampling unit 3 is connected to each single cell in the battery pack and is used to sample the output voltage of each single cell. The processor 2 is also used to obtain the second conversion results obtained by the multiple voltage measurement modules respectively converting the output voltage, and generate the detection result based on the first conversion result and the second conversion result.

[0055] In the above embodiment, the output voltage of each single cell is sampled by the second sampling unit 3, and the multi-channel standard voltage provided by the first sampling unit 1 based on the total output of the battery pack is obtained, so that the processor 2 can analyze the first conversion result based on the standard voltage and the second conversion result based on the output voltage. Since the total output of the battery pack is affected by the state of each single cell, the detection result generated by combining the first conversion result and the second conversion result can more comprehensively reflect the accuracy of the voltage measurement module conversion.

[0056] In some embodiments, the first sampling unit 1 includes a plurality of first resistors R1 sequentially connected in series between the battery pack and the ground, and the standard voltage is obtained based on the voltage difference across each first resistor R1.

[0057] The total output of the battery pack is divided by a plurality of first resistors R1 to obtain a standard voltage. As an example, the resistance values ​​of the first resistors R1 may be equal, so that the voltage difference across each first resistor R1 is equal, thereby making each standard voltage equal, and the sum of the voltage differences across all first resistors R1 is equal to the total output of the battery pack.

[0058] Combination Figure 3 As an example, the number of first resistors R1 can be consistent with the number of single cells in the battery pack. For example, the single cells include B1, B2...BN, with a total of N single cells, then the number of first resistors R1 is also N. Combined with the fact that the resistance values ​​of all first resistors R1 are equal, the voltage difference across each first resistor R1 can establish a corresponding relationship with the output voltage of a single cell in the battery pack, that is, the standard voltage can be used as the output of the single cell under ideal conditions.

[0059] In the above implementation, the first sampling unit 1 realizes voltage division of the total output of the battery pack by connecting a plurality of first resistors R1 of equal resistance in series between the battery pack and the ground, and the voltage difference across each first resistor R1 is the standard voltage. This simplifies the circuit structure and ensures the accuracy of the standard voltage, providing a benchmark for the subsequent processor 2 to detect the performance of the voltage measurement module.

[0060] In some embodiments, the detection circuit of the battery pack voltage measurement module further includes a switch unit 4. The switch unit 4 is arranged in series between the battery pack and the first sampling unit 1, and is used to control the connection between the battery pack and the first sampling unit 1.

[0061] As an example, the switch unit 4 may also be communicatively connected to the processor 2 so that the processor 2 can control the on / off state of the switch unit 4 .

[0062] In the above embodiment, when the voltage measurement module needs to be detected, the switch unit 4 is closed to ensure that the first sampling unit 1 works normally to provide a standard voltage. When the voltage measurement module does not need to be detected, the switch unit 4 controls the current path of the first sampling unit 1 to be disconnected, thereby avoiding unnecessary power consumption.

[0063] In some embodiments, the second sampling unit 3 includes a second resistor R2 and a third resistor R3. The second resistor R2 includes a first end and a second end connected to the positive electrode of the single battery; the third resistor R3 includes a first end and a second end connected to the negative electrode of the single battery; the output voltage is obtained based on the voltage difference between the first end of the second resistor R2 and the first end of the third resistor R3.

[0064] In some embodiments, the detection circuit of the battery pack voltage measurement module also includes a differential voltage conversion unit 5 connected to the first sampling unit 1, the second sampling unit 3 and the voltage measurement module respectively, and the differential voltage conversion unit 5 is used to convert the standard voltage and the output voltage into relative analog quantities and output them to the voltage measurement module.

[0065] As an example, the differential voltage conversion unit 5 receives the potential across the first resistor R1 in the first sampling unit 1 and the potential across the single battery in the battery pack collected by the second sampling unit 3, and respectively calculates the voltage difference across the first resistor R1 and the voltage difference across the single battery to obtain a relative analog quantity. For example, if the potential at the first end of the first resistor R1 is 25V, and the potential at the second end of the first resistor R1 is 20V, then the voltage difference across the first resistor R1 obtained by the differential voltage conversion unit 5 is 5V, that is, the relative analog quantity is 5V. At this time, the relative analog quantity of 5V can be transmitted to the voltage measurement module for conversion, without transmitting the higher voltage of 20V or 25V to the voltage measurement module, which reduces the voltage measurement module's demand for voltage resistance, thereby further reducing costs.

[0066] As an example, the differential voltage conversion unit 5 may also be communicatively connected to the processor 2 so that the processor 2 sends a control instruction to the differential voltage conversion unit 5 to control the differential voltage conversion unit 5 to convert the standard voltage or the output voltage.

[0067] Reference Figure 4 According to the second aspect of the present application, a method for detecting a battery pack voltage measurement module is provided, including steps S101 to S102, which are described in detail below.

[0068] Step S101: obtaining first conversion results obtained by converting multiple standard voltages respectively by multiple voltage measurement modules; wherein the standard voltage is obtained based on the total output of the battery pack.

[0069] Step S102: Generate a detection result based on the first conversion result.

[0070] In some embodiments, step S102 includes steps S1021 to S1023, which are described in detail below.

[0071] Step S1021: determine whether a plurality of first conversion results are equal to each other within a preset error range, if so, execute step S1022; if not, execute step S1023.

[0072] The error range may be set according to actual accuracy requirements, for example, the error range may be set to 5% or 10%.

[0073] Step S1022: Determine whether the voltage measurement module is normal.

[0074] Step S1023: Determine whether the voltage measurement module is abnormal.

[0075] As an example, taking four identical standard voltages as an example, the first conversion results obtained by converting the four standard voltages are respectively U R1 , U R2 , UR3 and U R4 , then judge U R1 , U R2 , U R3 and U R4 Whether the fluctuation between the values ​​is within the set error range, for example, U R1 , U R2 , U R3 and U R4 The values ​​are 3.9V, 3.8V, 4.1V and 4.1V respectively. If they are within the preset error range, the voltage measurement module is normal.

[0076] Reference Figure 5 In some embodiments, the detection circuit of the battery pack voltage measurement module further includes steps S201 to S202, which are described in detail below.

[0077] Step S201: obtaining second conversion results obtained by converting the output voltages of multiple voltage measurement modules respectively.

[0078] The output voltage is obtained by sampling the output of each single cell in the battery pack.

[0079] Step S202: Obtain a detection result based on the first conversion result and the second conversion result.

[0080] In some embodiments, step S202 includes steps S2021 to S2023, which are described in detail below.

[0081] Step S2021: determine whether the superposition value of the first conversion result and the superposition value of the second conversion result are equal within a preset error range, if so, execute step S2022; if not, execute step S2023.

[0082] Step S2022: Determine whether the voltage measurement module is normal.

[0083] Step S2023: Determine whether the voltage measurement module is abnormal.

[0084] As an example, a battery pack includes four single cells and four channels with the same standard voltage. The first conversion results obtained by converting the four channels of standard voltage are respectively U R1 , U R2 , U R3 and U R4 , then the superposition value of the first conversion result UR = U R1 +U R2 +U R3 +U R4 The four single cells are B1, B2, B3 and B4, and the second conversion results obtained by converting their output voltages are U B1 , UB2 , U B3 and U B4 , then the superposition value of the second conversion result UB = U B1 +U B2 +U B3 +U B4 If UR≈UB is within the preset error range, it can be determined that the voltage measurement module is normal.

[0085] After step S1023 or step S2023, step S301-step S302 are also included, which are described in detail below.

[0086] Step S301: determining a target conversion result based on a plurality of first conversion results.

[0087] Among them, the target conversion result can be the first conversion result that appears the most times among multiple first conversion results. For example, if the first conversion results include 3.9V, 2.8V, 4.1V and 4.1V, 4.1V is used as the target conversion result. Furthermore, if there is no identical first conversion result among multiple first conversion results, the average of the first conversion results within the error range among the multiple first conversion results can be taken as the target conversion result. For example, the first conversion results include 3.9V, 2.8V, 4.1V and 4.0V, among which 3.9V, 4.1V and 4.0V are the first conversion results within the error range, then the average of 3.9V, 4.1V and 4.0V is taken, and the target conversion result at this time is 4.0V.

[0088] Step S302: Determine the module identification of the abnormal voltage measurement module based on the target conversion result.

[0089] The module identifier of the voltage measurement module is used to indicate the position of the single battery measured by the voltage measurement module.

[0090] In the above implementation, based on the target conversion result determined based on multiple first conversion results, the position of a voltage measurement module with normal function and the position of a voltage measurement module with abnormal function can be distinguished, so that the position of the abnormal voltage measurement module can be located by generating a module identifier.

[0091] Reference Figure 6 In some embodiments, the detection circuit for measuring the battery pack voltage further includes steps S401 to S403, which are described in detail below.

[0092] Step S401: using a second conversion result obtained by a normal voltage measurement module as a first monomer output voltage.

[0093] As an example, if the voltage measurement module functions normally, the second conversion result output by the voltage measurement module is accurate, and the second conversion result can accurately represent the output voltage of the single cell battery, which is recorded as the first single cell output voltage. If the voltage measurement module functions abnormally, the second conversion result output by the voltage measurement module is incorrect, and the second conversion result cannot accurately represent the output voltage of the single cell battery, which is recorded as the second single cell output voltage.

[0094] Step S402: Generate the actual total output voltage of the battery pack based on the target conversion result.

[0095] The target conversion result is the first conversion result output by the voltage measurement module with the correct function. Therefore, when the standard voltage provided by the first sampling unit 1 is the same, the actual total output voltage of the battery pack can be expressed as U 总 =N×target conversion result.

[0096] Step S403: generating a second single-cell output voltage of the abnormal voltage measurement module based on the actual total output voltage and the first single-cell output voltage.

[0097] The second single cell output voltage is used to represent the correct output voltage of the single cell measured by the abnormal voltage measurement module. As an example, the second single cell output voltage of the abnormal voltage measurement module can be expressed as U2=U 总 -U1; wherein U1 is the superposition value of all first monomer output voltages.

[0098] As an example, if the first conversion results are 3.5V, 1.4V, 3.5V and 3.5V respectively, the target conversion result is 3.5V, and the actual total output voltage of the battery pack can be expressed as Utotal=3.5V×4=13.5V. The voltage measurement module that outputs the first conversion result of 1.4V is used as an abnormal voltage measurement module. At the same time, if the second conversion results are 3.3V, 2.6V, 3.6V and 3.5V respectively, the second conversion result output by the abnormal voltage measurement module is 2.6V, and the remaining second conversion results can all represent the correct output of the single cell battery, that is, the first single cell output voltage is 3.3V, 3.6V and 3.5V. At this time, the second single cell output voltage can be expressed as U2=13.5V-3.3V-3.6V-3.5V=3.6V, and 3.6V is the correct output voltage of the single cell battery measured by the abnormal voltage measurement module.

[0099] In the above embodiment, when an abnormality occurs in the voltage measurement module, the second single-cell output voltage of the abnormal voltage measurement module is generated by using the actual total output voltage and the first single-cell output voltage to represent the correct output voltage of the single-cell battery measured by the abnormal voltage measurement module, so as to correct the erroneous single-cell output voltage collected.

[0100] According to a second aspect of the present disclosure, a detection method for a battery pack voltage measurement module is provided, and the detection method for the battery pack voltage measurement module includes the detection circuit of the battery pack voltage measurement module described above. The detection method for the battery pack voltage measurement module has all the beneficial effects of the detection circuit of the battery pack voltage measurement module described above, and the present disclosure will not repeat them here.

[0101] According to a third aspect of the present application, the present application provides a battery management system, comprising a detection circuit of the above-mentioned battery pack voltage measurement module.

[0102] For example, the battery management system can be applied to the management of the power battery pack of a vehicle. The vehicle can be a fuel vehicle, a plug-in hybrid vehicle, or a new energy vehicle, etc., and the present disclosure does not make specific limitations on this.

[0103] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0104] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0105] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0106] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A detection circuit for a battery pack voltage measurement module, characterized in that: include: A first sampling unit, connected to the battery pack, for providing a plurality of standard voltages based on the total output of the battery pack; The processor is used to obtain first conversion results obtained by converting the standard voltage by multiple voltage measurement modules respectively, and generate a detection result based on the first conversion results.

2. The detection circuit of the battery pack voltage measurement module according to claim 1, characterized in that: Also includes: A second sampling unit, connected to each single cell in the battery pack, for sampling the output voltage of each single cell; The processor is further configured to obtain second conversion results obtained by converting the output voltage by the plurality of voltage measurement modules respectively, and generate the detection result based on the first conversion result and the second conversion result.

3. The detection circuit of the battery pack voltage measurement module according to claim 1, characterized in that: The first sampling unit includes a plurality of first resistors sequentially connected in series between the battery pack and the ground, and the standard voltage is obtained based on a voltage difference across each of the first resistors.

4. The detection circuit of the battery pack voltage measurement module according to claim 3, characterized in that: The resistance values ​​of the first resistors are equal.

5. The detection circuit of the battery pack voltage measurement module according to claim 1, characterized in that: It also includes a switch unit, which is arranged in series between the battery pack and the first sampling unit to control the connection between the battery pack and the first sampling unit.

6. The detection circuit of the battery pack voltage measurement module according to claim 2, characterized in that: The second sampling unit includes a second resistor and a third resistor; The second resistor includes a first end and a second end connected to the positive electrode of the single cell; The third resistor includes a first end and a second end connected to the negative electrode of the single cell; The output voltage is obtained based on a voltage difference between a first end of the second resistor and a first end of the third resistor.

7. The detection circuit of the battery pack voltage measurement module according to claim 2, characterized in that: It also includes a differential voltage conversion unit connected to the first sampling unit, the second sampling unit and the voltage measurement module, and is used for converting the standard voltage and the output voltage into relative analog quantities and then outputting them to the voltage measurement module.

8. A method for detecting a battery pack voltage measurement module, characterized in that: include: Acquire a first conversion result obtained by converting multiple standard voltages respectively by multiple voltage measurement modules; wherein the standard voltage is obtained based on the total output of the battery pack; A detection result is generated based on the first conversion result.

9. The detection method of the battery pack voltage measurement module according to claim 8, characterized in that: Generating a detection result based on the first conversion result includes: It is determined whether the plurality of first conversion results are equal to each other within a preset error range. If so, it is determined that the voltage measurement module is normal; if not, it is determined that the voltage measurement module is abnormal.

10. The detection method of the battery pack voltage measurement module according to claim 8, characterized in that: Also includes: Acquire a second conversion result obtained by converting the output voltage by the plurality of voltage measurement modules respectively; wherein the output voltage is obtained by sampling the output of each single cell in the battery pack; The detection result is obtained based on the first conversion result and the second conversion result.

11. The detection method of the battery pack voltage measurement module according to claim 10, characterized in that: The obtaining the detection result based on the first conversion result and the second conversion result includes: Determine whether the superposition value of the first conversion result and the superposition value of the second conversion result are equal within a preset error range; if so, determine that the voltage measurement module is normal; if not, determine that the voltage measurement module is abnormal.

12. The detection method of the battery pack voltage measurement module according to claim 9, characterized in that: After determining that the voltage measurement module is abnormal, the method further includes: determining a target conversion result based on a plurality of the first conversion results; Based on the target conversion result, a module identification of the abnormal voltage measurement module is determined.

13. The detection method of the battery pack voltage measurement module according to claim 12, characterized in that: Also includes: Using a second conversion result obtained by the normal voltage measurement module as the first monomer output voltage; Based on the target conversion result, generating an actual total output voltage of the battery pack; The abnormal second cell output voltage of the voltage measurement module is generated based on the actual total output voltage and the first cell output voltage.

14. A battery management system, characterized in that: A detection circuit comprising a battery pack voltage measurement module as claimed in any one of claims 1 to 7.

Images