A power battery and overvoltage protection control method and system

Abstract

The application provides a power battery and an overvoltage protection control method and system. The temperature of a single cell is collected, and a corresponding initial overvoltage threshold is obtained according to the temperature of the single cell. The initial overvoltage threshold is corrected to obtain a final overvoltage threshold. The voltage of the single cell is compared with the final overvoltage threshold for analysis to obtain an analysis result. When the analysis result is that the single cell appears an overvoltage situation, a corresponding overvoltage protection control instruction is generated. The overvoltage protection control instruction is executed to protect the power battery. The rationality of the threshold is ensured, the battery voltage control is more accurate, the performance of the battery is fully exerted, the overvoltage and overcharge phenomenon is reduced, and the battery damage is avoided.

Description

Technical Field

[0001] This invention relates to the field of power battery protection technology, and in particular to a power battery and an overvoltage protection control method and system. Background Technology

[0002] With the increasing popularity of electric vehicles, people are paying more and more attention to the safety and lifespan of power batteries, especially the lithium batteries that are currently in widespread use. Due to the characteristics of lithium batteries, there are strict limitations on their normal operating range. Exceeding the voltage range, temperature range, and current range will seriously damage the lithium battery, not to mention overuse caused by improper operation. Therefore, the power battery control system needs to monitor battery information and safety at all times to protect the battery.

[0003] Currently, the commonly used protection for the voltage of a single battery cell is to monitor the voltage of the battery cell and compare it with a set threshold. However, due to the inherent error in voltage acquisition, overvoltage or undervoltage may still occur during normal use, damaging the battery. Alternatively, if the threshold is set improperly, it may overprotect the battery voltage, limiting battery performance. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a power battery and an overvoltage protection control method and system, aiming to achieve a balance between power battery overvoltage protection and battery performance.

[0005] A method for overvoltage protection control of a power battery, wherein the power battery is composed of several individual cells, including:

[0006] Step A1: Collect the temperature of the monomer and obtain the corresponding initial overvoltage threshold based on the temperature of the monomer;

[0007] Step A2: Based on the operating parameters associated with the individual cell, the initial overvoltage threshold is corrected to obtain the final overvoltage threshold;

[0008] Step A3: Compare and analyze the current voltage of the individual cell with the final overvoltage threshold, and perform overvoltage protection on the power battery based on the comparison and analysis results.

[0009] Furthermore, the operating parameters of a single cell include the acquisition accuracy of the voltage acquisition of the single cell. Step A2 includes:

[0010] Step A21a: Correct the initial overvoltage threshold according to the acquisition accuracy to obtain the final overvoltage threshold.

[0011] Furthermore, the operating parameters of a single cell include the acquisition accuracy of the cell's voltage and the cumulative operating time of the power battery. Step A2 includes:

[0012] Step A21b: Correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold;

[0013] Step A22b: Correct the error correction threshold based on the cumulative working time of the power battery to obtain the final overvoltage threshold.

[0014] Furthermore, the operating parameters of a single cell include the acquisition accuracy of the cell's voltage, the cumulative operating time of the power battery, and the set full charge margin. Step A2 includes:

[0015] Step A21c: Correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold;

[0016] Step A22c: Correct the error correction threshold based on the cumulative working time of the power battery to obtain the life correction threshold;

[0017] Step A23c: Adjust the lifetime correction threshold according to the set full margin to obtain the final overvoltage threshold.

[0018] Furthermore, the initial overvoltage threshold includes a first initial overvoltage threshold and a second initial overvoltage threshold;

[0019] The final overvoltage threshold includes a first final overvoltage threshold corresponding to a first initial overvoltage threshold, and a second final overvoltage threshold corresponding to a second initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the second initial overvoltage threshold;

[0020] When the power battery is in a charging state, step A3 includes:

[0021] Step A31a: Compare the voltage of the individual cell with the first final overvoltage threshold and the second final overvoltage threshold.

[0022] If the voltage of a single cell is greater than the first final overvoltage threshold, proceed to step A32a;

[0023] If the voltage of a single cell is greater than the second final overvoltage threshold but not greater than the first final overvoltage threshold, proceed to step A33a;

[0024] If the voltage of a single cell is not greater than the second final overvoltage threshold, it is confirmed that the single cell has not experienced an overvoltage situation, and no overvoltage protection control command is generated.

[0025] Step A32a generates an overvoltage protection control command to disconnect the main positive relay and the main negative relay of the power battery in order to provide overvoltage protection for the power battery.

[0026] Step A33a generates an overvoltage protection control command to prohibit charging, thereby protecting the power supply from overvoltage.

[0027] Furthermore, the initial overvoltage threshold includes a first initial overvoltage threshold and a third initial overvoltage threshold;

[0028] The final overvoltage threshold includes a first final overvoltage threshold corresponding to a first initial overvoltage threshold, and a third final overvoltage threshold corresponding to a third initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the third initial overvoltage threshold;

[0029] When the power battery is in use, step A3 includes:

[0030] Step A31b: Compare the voltage of the individual cell with the first final overvoltage threshold and the third final overvoltage threshold.

[0031] If the voltage of a single cell is greater than the first final overvoltage threshold, proceed to step A32b;

[0032] If the voltage of a single cell is greater than the third final overvoltage threshold but not greater than the first final overvoltage threshold, proceed to step A33b.

[0033] If the voltage of a single cell is not greater than the third final overvoltage threshold, it is confirmed that the single cell has not experienced an overvoltage situation, and no overvoltage protection control command is generated.

[0034] Step A32b generates an overvoltage protection control command to disconnect the main positive relay and the main negative relay of the power battery in order to provide overvoltage protection for the power battery.

[0035] Step A33b generates an overvoltage protection control command that prohibits energy recovery in order to provide overvoltage protection for the power.

[0036] A power battery overvoltage protection control system, used to execute the aforementioned power battery overvoltage protection method, includes:

[0037] The single-cell temperature acquisition module is connected to the power battery and is used to acquire the temperature of the single cells.

[0038] The single-cell voltage acquisition module is connected to the power battery and is used to acquire the voltage of the individual cells.

[0039] The power battery control module is connected to the single-cell temperature acquisition module and the single-cell voltage acquisition module respectively, and is used for:

[0040] The initial overpressure threshold is obtained based on the temperature of the monomer.

[0041] The initial overvoltage threshold is corrected based on the operating parameters associated with the individual cell to obtain the final overvoltage threshold;

[0042] The voltage of a single cell is compared and analyzed with the final overvoltage threshold to obtain the comparison and analysis results. When the comparison and analysis results indicate that a single cell is overvoltaged, a corresponding overvoltage protection control command is generated.

[0043] The instruction execution module is connected to the power battery control module and is used to execute overvoltage protection control instructions to protect the power battery.

[0044] Furthermore, the operating parameters of a single unit include the acquisition accuracy of the single unit voltage acquisition module;

[0045] The power battery control module includes:

[0046] The first correction unit is used to correct the initial overvoltage threshold according to the acquisition accuracy to obtain the final overvoltage threshold.

[0047] Furthermore, the operating parameters of a single cell include the acquisition accuracy of the single cell voltage acquisition module and the cumulative operating time of the power battery. The power battery control module includes:

[0048] The first correction unit is used to correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold;

[0049] The second correction unit, connected to the first correction unit, is used to correct the error correction threshold based on the cumulative working time of the power battery to obtain the final overvoltage threshold.

[0050] A power battery is charged using the aforementioned power battery overvoltage protection control method.

[0051] The beneficial technical effects of this invention are as follows: This invention obtains the overvoltage protection threshold based on temperature, corrects the threshold, uses the corrected overvoltage threshold to analyze the overvoltage situation of the single cell voltage, and generates corresponding control protection commands to protect the power battery, ensuring the rationality of the threshold, making the battery voltage control more precise, giving full play to the battery performance, reducing the occurrence of overvoltage and overcharge phenomena, and avoiding battery damage. Attached Figure Description

[0052] Figure 1-5 This is a flowchart illustrating the steps of a power battery overvoltage protection control method according to the present invention.

[0053] Figure 6-9 This is a schematic diagram of a power battery overvoltage protection control system according to the present invention. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0056] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0057] See Figure 1 This invention provides a method for overvoltage protection control of a power battery, wherein the power battery is composed of several individual cells, including:

[0058] Step A1: Collect the temperature of the monomer and obtain the corresponding initial overvoltage threshold based on the temperature of the monomer;

[0059] Step A2: Based on the operating parameters associated with the individual cell, the initial overvoltage threshold is corrected to obtain the final overvoltage threshold;

[0060] Step A3: Compare and analyze the current voltage of the individual cell with the final overvoltage threshold, and perform overvoltage protection on the power battery based on the comparison and analysis results.

[0061] In step A3, the voltage of a single cell is compared and analyzed with the final overvoltage threshold to obtain the analysis result. When the analysis result indicates that the single cell is overvoltaged, a corresponding overvoltage protection control command is generated and executed to protect the power battery.

[0062] Specifically, the power battery is a lithium battery. These power batteries are used in electric vehicles.

[0063] This invention obtains the overvoltage protection threshold based on temperature, corrects the threshold, uses the corrected overvoltage threshold to analyze the overvoltage situation of individual cell voltages, and generates corresponding control protection commands to protect the power battery. This ensures the rationality of the threshold, makes battery voltage control more precise, fully utilizes battery performance, reduces overvoltage and overcharge phenomena, and avoids battery damage.

[0064] In step A1, the initial overpressure threshold is obtained by looking up a table based on the temperature of the monomer.

[0065] In step A1, there is a temperature-initial voltage threshold relationship table in advance, which characterizes the electrical performance of the power battery cell. This table is obtained from a special test.

[0066] Furthermore, as a preferred approach, the operating parameters of a single cell include the acquisition accuracy of the voltage acquisition of the single cell. Step A2 includes:

[0067] Step A21a: Correct the initial overvoltage threshold according to the acquisition accuracy of the individual voltage acquisition module to obtain the final overvoltage threshold.

[0068] In this method, in step A21a, the acquisition error value is obtained by multiplying the voltage acquisition accuracy by the initial overvoltage threshold. The acquisition error value is added to the initial overvoltage threshold to obtain the error correction threshold, which is used as the final overvoltage threshold. That is, voltage acquisition accuracy * initial overvoltage threshold + initial overvoltage threshold = error correction threshold. The initial overvoltage threshold is directly compensated based on the acquisition accuracy.

[0069] See Figure 2 As another preferred approach, further, the operating parameters of the individual cell include the acquisition accuracy of the individual cell's voltage and the cumulative operating time of the power battery. Step A2 includes:

[0070] Step A21b: Correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold;

[0071] Step A22b involves correcting the error correction threshold based on the cumulative operating time of the power battery to obtain the final overvoltage threshold. For example, a life correction coefficient can be obtained based on the cumulative operating time of the power battery, and the error correction threshold can be corrected based on the life correction coefficient to obtain the final overvoltage threshold.

[0072] In this method, in step A21b, the acquisition error value is obtained by multiplying the voltage acquisition accuracy by the initial overvoltage threshold, and the acquisition error value is added to the initial overvoltage threshold to obtain the error correction threshold.

[0073] In this method, in step A22b, the life correction coefficient is obtained based on the cumulative working time of the power battery. The error correction threshold is multiplied by the life correction coefficient to obtain the life correction threshold, which is used as the final overvoltage threshold. The system also contains a MAP table, which is a table showing the relationship between cumulative working time and the life correction coefficient. This table characterizes the electrical performance of the power battery cells and can be obtained through specialized testing. The life correction coefficient is obtained by looking up the table based on the cumulative working time.

[0074] See Figure 3 As another preferred approach, further, the operating parameters of the individual cell include the acquisition accuracy of the voltage acquisition of the individual cell, the cumulative operating time of the power battery, and the set full charge margin. Step A2 includes:

[0075] Step A21c: Correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold;

[0076] Step A22c: Correct the error correction threshold based on the cumulative operating time of the power battery to obtain the life correction threshold. For example, obtain the life correction coefficient based on the cumulative operating time of the power battery, and correct the error correction threshold based on the life correction coefficient to obtain the life correction threshold;

[0077] Step A23c: Adjust the lifespan correction threshold according to the set full charge margin to obtain the final overvoltage threshold. For example, obtain the margin correction coefficient based on the full charge margin of the power battery, and adjust the lifespan correction threshold according to the margin correction coefficient to obtain the final overvoltage threshold.

[0078] In this method, in step A21c, the acquisition error value is obtained by multiplying the voltage acquisition accuracy by the initial overvoltage threshold, and the acquisition error value is added to the initial overvoltage threshold to obtain the error correction threshold.

[0079] In this method, in step A22c, the life correction coefficient is obtained by querying based on the cumulative working time of the power battery, and the error correction threshold is multiplied by the life correction coefficient to obtain the life correction threshold.

[0080] In this method, in step A23c, according to customer requirements, the margin correction coefficient corresponding to the full margin is obtained by looking up a table. The lifetime correction threshold is multiplied by the margin correction coefficient to obtain the final overpressure threshold.

[0081] Margin refers to the degree to which a certain margin is left, allowing for a certain amount of error. The relationship table between full margin and margin correction coefficient is obtained through experiments. The full margin is designed according to customer needs, and the margin correction coefficient is obtained by looking up the table to make corrections to meet customer needs.

[0082] See Figure 4 Furthermore, the initial overvoltage threshold includes a first initial overvoltage threshold and a second initial overvoltage threshold;

[0083] The final overvoltage threshold includes a first final overvoltage threshold corresponding to a first initial overvoltage threshold and a second final overvoltage threshold corresponding to a second initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the second initial overvoltage threshold; that is, in step A2, the first initial overvoltage threshold is corrected to obtain the first final overvoltage threshold, and the second initial overvoltage threshold is corrected to obtain the second final overvoltage threshold.

[0084] When the power battery is in a charging state, step A3 includes:

[0085] Step A31a: Compare the voltage of the individual cell with the first final overvoltage threshold and the second final overvoltage threshold.

[0086] If the voltage of a single cell is greater than the first final overvoltage threshold, proceed to step A32a;

[0087] If the voltage of a single cell is greater than the second final overvoltage threshold but not greater than the first final overvoltage threshold, proceed to step A33a;

[0088] If the voltage of a single cell is not greater than the second final overvoltage threshold, it is confirmed that the single cell has not experienced an overvoltage situation, and no overvoltage protection control command is generated.

[0089] Step A32a generates an overvoltage protection control command to disconnect the main positive relay and the main negative relay of the power battery in order to provide overvoltage protection for the power battery.

[0090] Step A33a generates an overvoltage protection control command to prohibit charging, thereby protecting the power supply from overvoltage.

[0091] Multiple overvoltage threshold levels can be set, and the protection scenarios differ under different threshold levels, which can fully achieve a balance between overvoltage protection and performance.

[0092] See Figure 5 Furthermore, the initial overvoltage threshold includes a first initial overvoltage threshold and a third initial overvoltage threshold;

[0093] The final overvoltage threshold includes a first final overvoltage threshold corresponding to a first initial overvoltage threshold and a third final overvoltage threshold corresponding to a third initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the third initial overvoltage threshold; that is, in step A2, the first initial overvoltage threshold is corrected to obtain the first final overvoltage threshold, and the third initial overvoltage threshold is corrected to obtain the third final overvoltage threshold.

[0094] When the power battery is in use (e.g., when the vehicle is running), step A3 includes:

[0095] Step A31b: Compare the voltage of the individual cell with the first final overvoltage threshold and the third final overvoltage threshold.

[0096] If the voltage of a single cell is greater than the first final overvoltage threshold, proceed to step A32b;

[0097] If the voltage of a single cell is greater than the third final overvoltage threshold but not greater than the first final overvoltage threshold, proceed to step A33b.

[0098] If the voltage of a single cell is not greater than the third final overvoltage threshold, it is confirmed that the single cell has not experienced an overvoltage situation, and no overvoltage protection control command is generated.

[0099] Step A32b generates an overvoltage protection control command to disconnect the main positive relay and the main negative relay of the power battery in order to provide overvoltage protection for the power battery.

[0100] Step A33b generates an overvoltage protection control command that prohibits energy recovery in order to provide overvoltage protection for the power.

[0101] The first initial overvoltage threshold, the second initial overvoltage threshold, and the third initial overvoltage threshold are corrected using the same correction method, which is one of the three correction methods mentioned above: step A21a, step A21b+step A22b, and step A21c+step A22c+step A23c.

[0102] Specifically, the first initial overvoltage threshold is greater than the second initial overvoltage threshold, and the second initial overvoltage threshold is greater than the third initial overvoltage threshold.

[0103] Multiple overvoltage threshold levels can be set, and the protection scenarios differ under different threshold levels, which can fully achieve a balance between overvoltage protection and performance.

[0104] See Figure 6 The present invention also provides a power battery overvoltage protection control system for executing the aforementioned power battery overvoltage protection method, comprising:

[0105] A single cell temperature acquisition module (2) is connected to the power battery (1) and is used to acquire the temperature of the single cell;

[0106] The single-cell voltage acquisition module (3) is connected to the power battery (1) and is used to acquire the voltage of the single cell;

[0107] The power battery control module (4) is connected to the single-cell temperature acquisition module (2) and the single-cell voltage acquisition module (3) respectively, and is used for:

[0108] The initial overpressure threshold is obtained based on the temperature of the monomer.

[0109] The initial overvoltage threshold is corrected based on the operating parameters associated with the individual cell to obtain the final overvoltage threshold;

[0110] The voltage of a single cell is compared and analyzed with the final overvoltage threshold to obtain the comparison and analysis results. When the analysis results indicate that a single cell is overvoltaged, a corresponding overvoltage protection control command is generated.

[0111] The instruction execution module (5) is connected to the power battery control module (4) and is used to execute overvoltage protection control instructions to protect the power battery.

[0112] See Figure 7 Furthermore, the operating parameters of a single unit include the acquisition accuracy of the single unit voltage acquisition module;

[0113] The power battery control module (4) includes:

[0114] The first correction unit (41a) is used to correct the initial overvoltage threshold according to the acquisition accuracy to obtain the final overvoltage threshold.

[0115] See Figure 8 Furthermore, the working parameters of a single cell include the acquisition accuracy of the single cell voltage acquisition module and the cumulative working time of the power battery.

[0116] The power battery control module includes:

[0117] The first correction unit (41b) is used to correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold;

[0118] The second correction unit (42b) is connected to the first correction unit (41b) and is used to correct the error correction threshold according to the cumulative working time of the power battery to obtain the final overvoltage threshold; for example, the life correction coefficient is obtained according to the cumulative working time of the power battery, and the error correction threshold is corrected according to the life correction coefficient to obtain the final overvoltage threshold.

[0119] See Figure 9 Furthermore, the working parameters of a single cell include the acquisition accuracy of the voltage of the single cell, the cumulative working time of the power battery, and the set full charge margin.

[0120] The power battery control module (4) includes:

[0121] The first correction unit (41c) is used to correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold;

[0122] The second correction unit (42c) is connected to the first correction unit (41c) and is used to correct the error correction threshold according to the cumulative working time of the power battery to obtain the life correction threshold; for example, the life correction coefficient is obtained according to the cumulative working time of the power battery, and the error correction threshold is corrected according to the life correction coefficient to obtain the life correction threshold.

[0123] The third correction unit (43c) is connected to the second correction unit (42c) and is used to correct the lifetime correction threshold according to the full margin to obtain the final overvoltage threshold.

[0124] Furthermore, the initial overvoltage threshold includes a first initial overvoltage threshold and a second initial overvoltage threshold; the final overvoltage threshold includes a first final overvoltage threshold corresponding to the first initial overvoltage threshold and a second final overvoltage threshold corresponding to the second initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the second initial overvoltage threshold; the power battery control module (4) corrects the first initial overvoltage threshold to obtain the first final overvoltage threshold and corrects the second initial overvoltage threshold to obtain the second final overvoltage threshold;

[0125] The power battery control module (4) includes:

[0126] The first control unit (44) is used for:

[0127] When the power battery is in the charging state, the voltage of the single cell is compared with the first final overvoltage threshold and the second final overvoltage threshold to obtain the first comparison result;

[0128] If the first comparison result is that the voltage of a single cell is greater than the first final overvoltage threshold, an overvoltage protection control command is generated to disconnect the main positive relay and the main negative relay of the power battery.

[0129] If the first comparison result is that the voltage of a single cell is greater than the second final overvoltage threshold but not greater than the first final overvoltage threshold, an overvoltage protection control command to prohibit charging is generated.

[0130] Furthermore, the initial overvoltage threshold includes a first initial overvoltage threshold and a third initial overvoltage threshold; the final overvoltage threshold includes a first final overvoltage threshold corresponding to the first initial overvoltage threshold and a third final overvoltage threshold corresponding to the third initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the third initial overvoltage threshold.

[0131] The power battery control module (4) corrects the first initial overvoltage threshold to obtain the first final overvoltage threshold, and corrects the third initial overvoltage threshold to obtain the third final overvoltage threshold;

[0132] The power battery control module also includes:

[0133] The second control unit (45) is used for:

[0134] When the power battery is in use, the voltage of a single cell is compared with the first final overvoltage threshold and the third final overvoltage threshold to obtain a second comparison result;

[0135] If the second comparison result is that the voltage of a single cell is greater than the first final overvoltage threshold, an overvoltage protection control command is generated to disconnect the main positive relay and the main negative relay of the power battery.

[0136] If the second comparison result is that the voltage of a single cell is greater than the third final overvoltage threshold but not greater than the first final overvoltage threshold, an overvoltage protection control command to prohibit energy recovery is generated.

[0137] The present invention also provides a power battery, which is charged using the aforementioned power battery overvoltage protection control method.

[0138] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for overvoltage protection control of a power battery, wherein the power battery is composed of several individual cells, characterized in that, include: Step A1: Collect the temperature of the monomer and obtain the corresponding initial overvoltage threshold based on the temperature of the monomer; Step A2: Based on the operating parameters associated with the individual unit, the initial overvoltage threshold is corrected to obtain the final overvoltage threshold; Step A3: Compare and analyze the current voltage of the single cell with the final overvoltage threshold, and perform overvoltage protection on the power battery based on the comparison and analysis results; The operating parameters of the single cell include the acquisition accuracy of the voltage acquisition of the single cell, the cumulative working time of the power battery, and the set full charge margin. Step A2 includes: Step A21c: Correct the initial overvoltage threshold according to the acquisition accuracy to obtain the error correction threshold; Step A22c: Correct the error correction threshold based on the cumulative working time of the power battery to obtain the life correction threshold; Step A23c: Correct the lifetime correction threshold according to the set full margin to obtain the final overvoltage threshold.

2. The overvoltage protection control method for a power battery as described in claim 1, characterized in that, The initial overvoltage threshold includes a first initial overvoltage threshold and a second initial overvoltage threshold; The final overvoltage threshold includes a first final overvoltage threshold corresponding to the first initial overvoltage threshold and a second final overvoltage threshold corresponding to the second initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the second initial overvoltage threshold; When the power battery is in a charging state, step A3 includes: Step A31a: Compare the voltage of the single cell with the first final overvoltage threshold and the second final overvoltage threshold. If the voltage of the single cell is greater than the first final overvoltage threshold, proceed to step A32a; If the voltage of the single cell is greater than the second final overvoltage threshold but not greater than the first final overvoltage threshold, proceed to step A33a; If the voltage of the single cell is not greater than the second final overvoltage threshold, it is confirmed that the single cell has not experienced an overvoltage situation, and no overvoltage protection control command is generated; Step A32a: Generate an overvoltage protection control command to disconnect the main positive relay and the main negative relay of the power battery in order to provide overvoltage protection for the power battery; Step A33a generates an overvoltage protection control command to prohibit charging, thereby protecting the power battery from overvoltage.

3. The overvoltage protection control method for a power battery as described in claim 1, characterized in that, The initial overvoltage threshold includes a first initial overvoltage threshold and a third initial overvoltage threshold; The final overvoltage threshold includes a first final overvoltage threshold corresponding to the first initial overvoltage threshold, and a third final overvoltage threshold corresponding to the third initial overvoltage threshold, wherein the first initial overvoltage threshold is greater than the third initial overvoltage threshold; When the power battery is in use, step A3 includes: Step A31b: Compare the voltage of the single cell with the first final overvoltage threshold and the third final overvoltage threshold. If the voltage of the single cell is greater than the first final overvoltage threshold, proceed to step A32b; If the voltage of the single cell is greater than the third final overvoltage threshold but not greater than the first final overvoltage threshold, proceed to step A33b; If the voltage of the cell is not greater than the third final overvoltage threshold, it is confirmed that the cell has not experienced an overvoltage situation, and no overvoltage protection control command is generated. Step A32b generates an overvoltage protection control command to disconnect the main positive relay and the main negative relay of the power battery in order to provide overvoltage protection for the power battery. Step A33b generates an overvoltage protection control command that prohibits energy recovery in order to provide overvoltage protection for the power battery.

4. A power battery overvoltage protection control system, characterized in that, A method for implementing a power battery overvoltage protection control method as described in any one of claims 1-3, comprising: A single-cell temperature acquisition module, connected to the power battery, is used to acquire the temperature of the single cell; A single-cell voltage acquisition module, connected to the power battery, is used to acquire the voltage of the single cell; The power battery control module is connected to the single-cell temperature acquisition module and the single-cell voltage acquisition module respectively, and is used for: The initial overpressure threshold is obtained based on the temperature of the monomer. The initial overvoltage threshold is corrected based on the operating parameters associated with the individual cell to obtain the final overvoltage threshold; The voltage of the individual cell is compared and analyzed with the final overvoltage threshold to obtain the comparison and analysis result. When the comparison and analysis result indicates that the individual cell is overvoltaged, a corresponding overvoltage protection control command is generated. The instruction execution module is connected to the power battery control module and is used to execute the overvoltage protection control instruction to protect the power battery.

5. A power battery, characterized in that, The power battery is charged using a power battery overvoltage protection control method as described in any one of claims 1-3.

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