Battery power boundary control method and device, vehicle and storage medium

Abstract

The invention relates to a battery power boundary control method and device, a vehicle and a storage medium, and the battery power boundary control method can determine the current overcharge protection level and the over-discharge protection level through the maximum monomer voltage and the minimum monomer voltage of a power battery respectively, so that the over-charge protection level and the over-discharge protection level can be controlled under the condition of discharge. In the case of charging, the original discharging power boundary of the battery is corrected according to the over-discharging correction rate corresponding to the over-discharging protection level, and in the case of charging, the original charging power boundary of the battery is corrected according to the over-charging correction rate corresponding to the over-charging protection level. Therefore, over-charging and over-discharging of the battery are avoided, the battery is protected, the service life of the battery is prolonged, and the reliability of the whole vehicle is improved.

Description

Technical Field

[0001] This application relates to the technical field of electric vehicles, and particularly to a battery power boundary control method, device, vehicle and storage medium. Background Art

[0002] For electric vehicles using power batteries as energy pools, such as hybrid vehicles, when the engine power is insufficient, the battery needs to provide discharge power to meet normal demands; conversely, when the engine power is excessive or during energy recovery, the battery needs to absorb excess electrical energy. In this process, the actual power of the battery should be within the allowable power boundary of the battery, otherwise it is likely to cause overcharging or over-discharging of the battery, and in severe cases, it will directly lead to high voltage under battery failure and the vehicle losing power. However, as the passive party, the battery's charging and discharging are both passive receptions and cannot actively control. Generally, the vehicle controller will receive the allowable power boundary of the battery and participate in the energy distribution of the entire system to ensure that the battery power does not exceed the boundary for use. But in actual use, as the usage time extends, or the battery cannot perform State of Charge (SOC) correction for a long time, the SOC estimation of the battery may be inaccurate, and then the power boundary signal of the battery will be distorted. For example, when the SOC calculation is falsely high, the discharge power boundary will be too large. At this time, if the falsely high discharge power boundary is completely used, the battery voltage will quickly drop, resulting in under-voltage of the battery. In the light case, the vehicle will lose power due to battery failure, and in the severe case, the battery will be permanently damaged and need to be replaced. If the battery is overcharged, it may also cause the battery to catch fire. Therefore, both over-discharging and overcharging will affect the safety and reliability of the vehicle. Summary of the Invention

[0003] To solve the technical problem of how to avoid overcharging and over-discharging of the battery, this application provides a battery power boundary control method, device, vehicle and storage medium.

[0004] In a first aspect, this application provides a battery power boundary control method, and the method includes:

[0005] Obtain the current maximum single-cell voltage and minimum single-cell voltage of the power battery;

[0006] Determine the current over-discharge protection level according to the minimum single-cell voltage and a preset over-discharge mapping relationship, and determine the current over-charge protection level according to the maximum single-cell voltage and a preset over-charge mapping relationship; wherein, the over-discharge mapping relationship is the mapping relationship between the minimum single-cell voltage and the over-discharge protection level, and the over-charge mapping relationship is the mapping relationship between the maximum single-cell voltage and the over-charge protection level;

[0007] In the case of discharging the power battery, the original battery discharge power boundary is corrected according to the over-discharge correction rate corresponding to the current over-discharge protection level; wherein, the over-discharge protection level is positively correlated with the over-discharge correction rate;

[0008] In the case of charging the power battery, the original battery charging power boundary is corrected according to the over-charge correction rate corresponding to the current over-charge protection level; wherein, the over-charge protection level is positively correlated with the over-charge correction rate.

[0009] Optionally, obtaining the current maximum single-cell voltage and minimum single-cell voltage of the power battery includes:

[0010] Obtaining the single-cell voltage corresponding to each battery cell of the power battery currently;

[0011] Determining the maximum single-cell voltage and the minimum single-cell voltage from all the single-cell voltages.

[0012] Optionally, determining the current over-discharge protection level according to the minimum single-cell voltage and a preset over-discharge mapping relationship includes:

[0013] Determining the target over-discharge mapping relationship corresponding to the power battery according to the battery type and voltage platform of the power battery;

[0014] Determining the current over-discharge protection level according to the minimum single-cell voltage and the target over-discharge mapping relationship; wherein, the smaller the minimum single-cell voltage, the higher the corresponding over-discharge protection level.

[0015] Optionally, correcting the original battery discharge power boundary according to the over-discharge correction rate corresponding to the current over-discharge protection level includes:

[0016] Obtaining the first over-discharge correction rate corresponding to the current over-discharge protection level;

[0017] Correcting the original battery discharge power boundary according to the first over-discharge correction rate so that the power battery controls the output power according to the corrected discharge power boundary;

[0018] During the process that the power battery controls the output power according to the corrected discharge power boundary, obtaining the change trend of the minimum single-cell voltage;

[0019] If the change trend of the minimum single-cell voltage indicates that the minimum single-cell voltage continues to decrease, when the minimum single-cell voltage reaches the next-level over-discharge protection level, continue to correct the original battery discharge power boundary according to the next-level over-discharge correction rate corresponding to the next-level over-discharge protection level; wherein, the next-level over-discharge protection level is higher than the current over-discharge protection level;

[0020] If the change trend of the minimum cell voltage indicates that the minimum cell voltage stops decreasing after decreasing for a first preset duration, obtain a first corrected power within the first preset duration; correct the original battery discharge power boundary according to the first corrected power;

[0021] If the change trend of the minimum cell voltage indicates that the minimum cell voltage continuously rises and the minimum cell voltage is less than the maximum protection voltage in the target over-discharge mapping relationship, when the minimum cell voltage reaches the previous over-discharge protection level, continue to correct the original battery discharge power boundary according to the previous over-discharge correction slope corresponding to the previous over-discharge protection level; wherein, the previous over-discharge protection level is lower than the current over-discharge protection level;

[0022] If the minimum cell voltage is greater than or equal to the maximum protection voltage, restore the corrected discharge power boundary at a first recovery rate.

[0023] Optionally, correcting the original battery discharge power boundary according to the over-discharge correction rate corresponding to the current over-discharge protection level includes:

[0024] Obtain the total voltage and total current of the power battery;

[0025] Determine the actual power consumption according to the total voltage and total current;

[0026] Determine a first excess power value according to the actual power consumption and the original battery discharge power boundary;

[0027] Determine a first power adjustment value for closed-loop control according to the first excess power value;

[0028] Correct the original battery discharge power boundary according to the first power adjustment value and the over-discharge correction rate corresponding to the current over-discharge protection level.

[0029] Optionally, determining the current over-charge protection level according to the maximum cell voltage and a preset over-charge mapping relationship includes:

[0030] Determine the target over-charge mapping relationship corresponding to the power battery according to the battery type and voltage platform of the power battery;

[0031] Determine the current over-charge protection level according to the maximum cell voltage and the target over-charge mapping relationship; wherein, the greater the maximum cell voltage, the higher the corresponding over-charge protection level.

[0032] Optionally, correcting the original battery charge power boundary according to the over-charge correction rate corresponding to the current over-charge protection level includes:

[0033] Obtain a first overcharge correction rate corresponding to the current over-discharge protection level;

[0034] Correct the original charging power boundary of the battery according to the first overcharge correction rate, so that the power battery controls the input power according to the corrected charging power boundary;

[0035] During the process that the power battery controls the input power according to the corrected charging power boundary, obtain the change trend of the maximum single cell voltage;

[0036] If the change trend of the maximum single cell voltage indicates that the maximum single cell voltage continues to rise, when the maximum single cell voltage reaches the next overcharge protection level, continue to correct the original charging power boundary of the battery according to the next overcharge correction rate corresponding to the next overcharge protection level; wherein, the next overcharge protection level is higher than the current overcharge protection level;

[0037] If the change trend of the maximum single cell voltage indicates that the maximum single cell voltage stops rising after rising for a second preset duration, obtain a second correction power within the second preset duration; correct the original charging power boundary of the battery according to the second correction power;

[0038] If the change trend of the maximum single cell voltage indicates that the maximum single cell voltage continues to drop, and the maximum single cell voltage is greater than the minimum protection voltage in the target overcharge mapping relationship, when the maximum single cell voltage reaches the previous overcharge protection level, continue to correct the original charging power boundary of the battery according to the previous overcharge correction slope corresponding to the previous overcharge protection level; wherein, the previous overcharge protection level is lower than the current overcharge protection level;

[0039] If the maximum single cell voltage is less than or equal to the minimum protection voltage, restore the corrected charging power boundary at a second recovery rate.

[0040] Optionally, correcting the original charging power boundary of the battery according to the overcharge correction rate corresponding to the current overcharge protection level includes:

[0041] Obtain the total voltage and total current of the power battery;

[0042] Determine the actual charging power according to the total voltage and the total current;

[0043] Determine a second excess power value according to the actual charging power and the original charging power boundary of the battery;

[0044] Determine a second power adjustment value for closed-loop control according to the second excess power value;

[0045] Modify the original battery charging power boundary according to the second power adjustment value and the overcharge correction rate corresponding to the current overcharge protection level.

[0046] In a second aspect, the present application provides a battery power boundary control device, which includes:

[0047] An acquisition module, configured to acquire the current maximum cell voltage and minimum cell voltage of the power battery;

[0048] A determination module, configured to determine the current over-discharge protection level according to the minimum cell voltage and a preset over-discharge mapping relationship, and determine the current overcharge protection level according to the maximum cell voltage and a preset overcharge mapping relationship; wherein, the over-discharge mapping relationship is the mapping relationship between the minimum cell voltage and the over-discharge protection level, and the overcharge mapping relationship is the mapping relationship between the maximum cell voltage and the overcharge protection level;

[0049] An over-discharge correction module, configured to, when the power battery is discharging, modify the original battery discharge power boundary according to the over-discharge correction rate corresponding to the current over-discharge protection level; wherein, the over-discharge protection level is positively correlated with the over-discharge correction rate;

[0050] An overcharge correction module, configured to, when the power battery is charging, modify the original battery charging power boundary according to the overcharge correction rate corresponding to the current overcharge protection level; wherein, the overcharge protection level is positively correlated with the overcharge correction rate.

[0051] In a third aspect, the present application provides an electronic device, including a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete communication with each other through the communication bus;

[0052] The memory is used to store a computer program;

[0053] The processor, when executing the program stored on the memory, implements the steps of the battery power boundary control method described in any embodiment of the first aspect.

[0054] In a fourth aspect, the present application provides a vehicle, which applies the steps of the battery power boundary control method described in any of the first aspects.

[0055] In a fifth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the battery power boundary control method described in any embodiment of the first aspect.

[0056] Advantages of the present application:

[0057] The method provided by the embodiment of the present application obtains the maximum single-cell voltage and the minimum single-cell voltage of the power battery at present; determines the current over-discharge protection level according to the minimum single-cell voltage and a preset over-discharge mapping relationship, and determines the current over-charge protection level according to the maximum single-cell voltage and a preset over-charge mapping relationship; wherein, the over-discharge mapping relationship is the mapping relationship between the minimum single-cell voltage and the over-discharge protection level, and the over-charge mapping relationship is the mapping relationship between the maximum single-cell voltage and the over-charge protection level; in the case of the power battery discharging, corrects the original battery discharge power boundary according to the over-discharge correction rate corresponding to the current over-discharge protection level; wherein, the over-discharge protection level is positively correlated with the over-discharge correction rate; in the case of the power battery charging, corrects the original battery charging power boundary according to the over-charge correction rate corresponding to the current over-charge protection level; wherein, the over-charge protection level is positively correlated with the over-charge correction rate. This method can respectively determine the current over-charge protection level and over-discharge protection level through the maximum single-cell voltage and the minimum single-cell voltage of the power battery, so that in the case of discharging, correct the original battery discharge power boundary according to the over-discharge correction rate corresponding to the over-discharge protection level, and in the case of charging, correct the original battery charging power boundary according to the over-charge correction rate corresponding to the over-charge protection level. Since the charging and discharging power boundaries of the battery can be actively adjusted, over-charge and over-discharge of the battery can be avoided, the battery can be protected, the battery life can be improved, and the reliability of the whole vehicle can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0060] Figure 1 It is a system architecture diagram of a battery power boundary control method provided by an embodiment of the present application;

[0061] Figure 2 It is a flowchart of a battery power boundary control method provided by an embodiment of the present application;

[0062] Figure 3 It is a flowchart of a battery power boundary control method provided by another embodiment of the present application;

[0063] Figure 4Schematic structural diagram of a battery power boundary control device provided by an embodiment of the present application;

[0064] Figure 5 Schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0065] The following will illustrate the implementation manners of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, rather than for limiting the protection scope of the present application.

[0066] The first embodiment of the present application provides a battery power boundary control method, which can be applied to a system architecture as shown in Figure 1 . In this system architecture, it at least includes a control unit 101 and a power battery 102. The control unit 101 can collect signals of the power battery 102, such as voltage signals, current signals, etc. Specifically, this system architecture can be a vehicle. Among them, the type of the vehicle is not limited and can be any vehicle driven by a power battery, such as a pure electric vehicle, a hybrid vehicle, etc. The type of the power battery is not limited either. For example, it can be a ternary lithium battery, or a lithium iron phosphate battery or other types of batteries.

[0067] Next, based on this system architecture, the battery power boundary control method will be described in detail. As shown in Figure 2 , this battery power boundary control method includes:

[0068] Step 201: Obtain the current maximum single-cell voltage and minimum single-cell voltage of the power battery.

[0069] The maximum single-cell voltage refers to the maximum voltage among all the battery cells of the power battery, and the minimum single-cell voltage refers to the minimum voltage among all the battery cells. Although the voltage levels of each battery cell are generally not very different, there are still differences. By adjusting the original charging power boundary of the battery during charging according to the maximum single-cell voltage, and adjusting the original discharging power boundary of the battery during discharging according to the minimum single-cell voltage, all the battery cells of the power battery can be protected.

[0070] In one embodiment, obtaining the current maximum single-cell voltage and minimum single-cell voltage of the power battery includes: obtaining the single-cell voltage corresponding to each current battery cell of the power battery; determining the maximum single-cell voltage and the minimum single-cell voltage from all the single-cell voltages.

[0071] In this embodiment, the individual voltage corresponding to each battery cell of the power battery can be obtained. For example, the voltage data of each battery cell is collected through a battery management system (BMS), and the control unit can obtain the maximum individual voltage and the minimum individual voltage from the battery management system.

[0072] Step 202: Determine the current over-discharge protection level according to the minimum individual voltage and the preset over-discharge mapping relationship, and determine the current over-charge protection level according to the maximum individual voltage and the preset over-charge mapping relationship; wherein, the over-discharge mapping relationship is the mapping relationship between the minimum individual voltage and the over-discharge protection level, and the over-charge mapping relationship is the mapping relationship between the maximum individual voltage and the over-charge protection level.

[0073] For different types of batteries and voltage platforms, the voltage intervals that need to be protected are different. For example, different battery types correspond to different over-discharge mapping relationships and over-charge mapping relationships. Specifically, the current over-discharge protection level can be determined according to the minimum individual voltage and the preset over-discharge mapping relationship, and the current over-charge protection level can be determined according to the maximum individual voltage and the over-charge mapping relationship. Of course, if both the minimum individual voltage and the maximum individual voltage are within the voltage range that does not require protection, over-charge protection and over-discharge protection are not required.

[0074] In one embodiment, determining the current over-discharge protection level according to the minimum individual voltage and the preset over-discharge mapping relationship includes: determining the target over-discharge mapping relationship corresponding to the power battery according to the battery type and voltage platform of the power battery; determining the current over-discharge protection level according to the minimum individual voltage and the target over-discharge mapping relationship; wherein, the smaller the minimum individual voltage, the higher the corresponding over-discharge protection level.

[0075] In this embodiment, the target over-discharge mapping relationship corresponding to the power battery can be determined according to the battery type and voltage platform of the power battery, and the current over-discharge protection level can be determined according to the minimum individual voltage and the target over-discharge mapping relationship. For example, taking the battery type as a ternary lithium battery and the voltage platform as 400V as an example, the target over-discharge mapping relationship can include three over-discharge protection levels, namely over-discharge protection level one, over-discharge protection level two, and over-discharge protection level three. Among them, over-discharge protection level one can correspond to (3.2V - 3.0V], over-discharge protection level two can correspond to (3.0V - 2.8V], and over-discharge protection level three can correspond to below 2.8V. For example, if the minimum individual voltage is 3.1V, it corresponds to over-discharge protection level one, and if the minimum individual voltage drops to 2.9V during the protection process, it corresponds to over-discharge protection level two.

[0076] In one embodiment, determining the current overcharge protection level according to the maximum single-cell voltage and a preset overcharge mapping relationship includes: determining the target overcharge mapping relationship corresponding to the power battery according to the battery type and voltage platform of the power battery; determining the current overcharge protection level according to the maximum single-cell voltage and the target overcharge mapping relationship; wherein, the greater the maximum single-cell voltage, the higher the corresponding overcharge protection level.

[0077] In this embodiment, the target overcharge mapping relationship corresponding to the power battery can be determined according to the battery type and voltage platform of the power battery, and the current overcharge protection level is determined according to the maximum single-cell voltage and the target overcharge mapping relationship. For example, taking the battery type as a ternary lithium battery and the voltage platform as 400V as an example, the target overcharge mapping relationship can include three overcharge protection levels, namely overcharge protection level one, overcharge protection level two, and overcharge protection level three. Among them, overcharge protection level one can correspond to [3.4V - 3.6V), overcharge protection level two can correspond to [3.6V - 3.8V), and overcharge protection level three can correspond to above 3.8V. For example, if the maximum single-cell voltage is 3.5V, it corresponds to overcharge protection level one. If the maximum single-cell voltage rises to 3.7V during the protection process, it corresponds to overcharge protection level two.

[0078] Step 203, in the case of the power battery discharging, correct the original discharge power boundary of the battery according to the over-discharge correction rate corresponding to the current over-discharge protection level; wherein, the over-discharge protection level is positively correlated with the over-discharge correction rate.

[0079] Different over-discharge protection levels correspond to different over-discharge correction rates. For example, the over-discharge correction rate corresponding to over-discharge protection level one is 1kW / s, the over-discharge correction rate corresponding to over-discharge protection level two is 5kW / s, and the over-discharge correction rate corresponding to over-discharge protection level three is 10kW / s. Then, when correcting, if over-discharge protection level one is triggered, that is, on the basis of the original discharge power boundary of the battery, it is reduced by 1kW per second. After over-discharge protection level two is triggered, it is corrected according to the secondary correction rate, that is, 5kW / s, and it is reduced by 5kW per second on the basis of the original discharge power boundary. When over-discharge protection level three is triggered, it is corrected according to the tertiary correction rate of 10kW / s, and it is reduced by 10kW per second on the basis of the original discharge power boundary. When the voltage recovers, for example, from over-discharge protection level three to over-discharge protection level two, the over-discharge correction rate of the battery is reduced from 10kW / s to 5kW / s. When it recovers to over-discharge protection level one, the over-discharge correction rate is reduced from 5kW / s to 1kW / s.

[0080] In one embodiment, the original discharge power boundary of the battery is corrected according to the over-discharge correction rate corresponding to the current over-discharge protection level, including: obtaining the first over-discharge correction rate corresponding to the current over-discharge protection level; correcting the original discharge power boundary of the battery according to the first over-discharge correction rate so that the power battery controls the output power according to the corrected discharge power boundary; during the process that the power battery controls the output power according to the corrected discharge power boundary, obtaining the change trend of the minimum single cell voltage; if the change trend of the minimum single cell voltage indicates that the minimum single cell voltage continues to decrease, then when the minimum single cell voltage reaches the next over-discharge protection level, continue to correct the original discharge power boundary of the battery according to the next over-discharge correction rate corresponding to the next over-discharge protection level; wherein, the next over-discharge protection level is higher than the current over-discharge protection level; if the change trend of the minimum single cell voltage indicates that the minimum single cell voltage stops decreasing after a first preset duration of decline, then obtaining the first correction power within the first preset duration; correcting the original discharge power boundary of the battery according to the first correction power; if the change trend of the minimum single cell voltage indicates that the minimum single cell voltage continues to rise and the minimum single cell voltage is less than the maximum protection voltage in the target over-discharge mapping relationship, then when the minimum single cell voltage reaches the previous over-discharge protection level, continue to correct the original discharge power boundary of the battery according to the previous over-discharge correction slope corresponding to the previous over-discharge protection level; wherein, the previous over-discharge protection level is lower than the current over-discharge protection level; if the minimum single cell voltage is greater than or equal to the maximum protection voltage, then restore the corrected discharge power boundary according to the first recovery rate.

[0081] In this embodiment, the first over-discharge correction rate corresponding to the current over-discharge protection level is obtained. For example, if the current over-discharge protection level is the first level of over-discharge protection, the first over-discharge correction rate can be 1 kW / s. At this time, the original discharge power boundary of the battery is corrected according to the first over-discharge correction rate, that is, at a rate of 1 kW / s. During the process that the power battery corrects the output power at a rate of 1 kW / s, the change trend of the minimum single cell voltage is obtained, and different strategies can be adopted for different change trends. The change trend of the minimum single cell voltage can be judged by continuously obtaining the minimum single cell voltage. For example, a current minimum single cell voltage can be obtained every 0.1 s or 0.01 s, and the change trend is judged according to the values of multiple consecutive minimum single cell voltages, without limitation.

[0082] If the change trend of the minimum cell voltage indicates that the minimum cell voltage is continuously decreasing, then when the minimum cell voltage reaches the next over-discharge protection level, the original discharge power boundary of the battery is continuously corrected according to the next over-discharge correction rate corresponding to the next over-discharge protection level. For example, when the minimum cell voltage triggers the second-level over-discharge protection, the correction is carried out at the second-level correction rate, that is, 5 kW / s, and 5 kW is reduced from the original discharge power boundary every second. When the minimum cell voltage triggers the third-level over-discharge protection, the correction is carried out at the third-level correction rate of 10 kW / s, and 10 kW is reduced from the original discharge power boundary every second.

[0083] If the change trend of the minimum cell voltage indicates that the minimum cell voltage stops decreasing after the first preset duration of decrease. For example, the minimum cell voltage remains stable and does not continue to decrease 15 s after triggering the first-level over-discharge protection, and the voltage when it stops decreasing is still within the range of the first-level over-discharge protection, then the first correction power within the first preset duration = 15 s × 1 kW / s = 15 W, and the original discharge power boundary of the battery is corrected according to the first correction power, that is, the correction amount remains unchanged at 15 W.

[0084] If the change trend of the minimum cell voltage indicates that the minimum cell voltage is continuously increasing and the minimum cell voltage is less than the maximum protection voltage in the target over-discharge mapping relationship, then when the minimum cell voltage reaches the previous over-discharge protection level, the original discharge power boundary of the battery is continuously corrected according to the previous over-discharge correction slope corresponding to the previous over-discharge protection level. For example, if the current corresponding over-discharge protection is the second level, and the change trend of the minimum cell voltage indicates that the minimum cell voltage is continuously increasing and is less than the maximum protection voltage (taking the maximum protection voltage as 3.2 V as an example here), then when it rises to 3.0 V, the correction of the original discharge power boundary of the battery is switched to be carried out according to the correction slope corresponding to the first-level over-discharge protection. If the minimum cell voltage is greater than or equal to 3.2 V, it indicates that the voltage level of the current battery is normal, and at this time, the corrected discharge power boundary is restored according to the first recovery rate. The first recovery rate can be 2 kW / s or other values, without limitation.

[0085] In one embodiment, correcting the original discharge power boundary of the battery according to the over-discharge correction rate corresponding to the current over-discharge protection level includes: obtaining the total voltage and total current of the power battery; determining the actual power consumption according to the total voltage and total current; determining a first excess power value according to the actual power consumption and the original discharge power boundary of the battery; determining a first power adjustment value for closed-loop control according to the first excess power value; and correcting the original discharge power boundary of the battery according to the first power adjustment value and the over-discharge correction rate corresponding to the current over-discharge protection level.

[0086] In this embodiment, the actual power consumption of the battery can be obtained by multiplying the total voltage and total current of the battery. By comparing the actual power consumption with the original discharge power boundary of the battery, the first excess power value by which the battery power exceeds the boundary can be obtained. The first power adjustment value can be obtained by looking up a table according to the first excess power value or through a preset corresponding relationship. For example, the I term (integral term) of the closed-loop PID (Proportional-Integral-Derivative) control is obtained by looking up a table and integrated over time to obtain the first power adjustment value required for the closed-loop power control of the battery. The greater the excess power, the larger the value obtained by looking up the table, and the faster the accumulated power value increases over time. For example, when the actual discharge power of the battery exceeds the discharge power boundary, the power reduction rate required for the closed-loop power control of the battery is obtained by looking up a table. The more the excess, the faster the reduction rate. The original discharge power boundary of the battery can be corrected according to both the first power adjustment value and the over-discharge correction rate corresponding to the current over-discharge protection level, so as to further enhance the protection effect on the battery.

[0087] Step 204: When the power battery is being charged, correct the original charging power boundary of the battery according to the overcharge correction rate corresponding to the current overcharge protection level; where the overcharge protection level is positively correlated with the overcharge correction rate.

[0088] It should be noted that the order of Step 203 and Step 204 is not limited and is determined according to the charging and discharging scenarios.

[0089] Different overcharge protection levels correspond to different overcharge correction rates. For example, the overcharge correction rate corresponding to the first-level overcharge protection is 1 kW / s, the overcharge correction rate corresponding to the second-level overcharge protection is 5 kW / s, and the overcharge correction rate corresponding to the third-level overcharge protection is 10 kW / s. When making corrections, if the first-level overcharge protection is triggered, that is, on the basis of the original charging power boundary of the battery (the original charging power boundary of the battery is a negative value), it rises by 1 kW per second. After the second-level overcharge protection is triggered, corrections are made according to the second-level correction rate, that is, 5 kW / s, and it increases by 5 kW per second on the basis of the original charging power boundary. When the third-level overcharge protection is triggered, corrections are made according to the third-level correction rate of 10 kW / s, and it increases by 10 kW per second on the basis of the original charging power boundary. When the voltage recovers, for example, when recovering from the third-level overcharge protection to the second-level overcharge protection, the overcharge correction rate of the battery decreases from 10 kW / s to 5 kW / s. When recovering to the first-level overcharge protection, the overcharge correction rate decreases from 5 kW / s to 1 kW / s.

[0090] This method can respectively determine the current overcharge protection level and over-discharge protection level through the maximum single-cell voltage and minimum single-cell voltage of the power battery. Thus, in the case of discharging, the original discharge power boundary of the battery is corrected according to the over-discharge correction rate corresponding to the over-discharge protection level, and in the case of charging, the original charging power boundary of the battery is corrected according to the overcharge correction rate corresponding to the overcharge protection level. Since the charging and discharging power boundaries of the battery can be actively adjusted, overcharge and over-discharge of the battery can be avoided, the battery is protected, the battery life is improved, and the reliability of the whole vehicle is increased.

[0091] In one embodiment, correcting the original charging power boundary of the battery according to the overcharge correction rate corresponding to the current overcharge protection level includes: obtaining a first overcharge correction rate corresponding to the current over-discharge protection level; correcting the original charging power boundary of the battery according to the first overcharge correction rate so that the power battery controls the input power according to the corrected charging power boundary; during the process that the power battery controls the input power according to the corrected charging power boundary, obtaining the change trend of the maximum single-cell voltage; if the change trend of the maximum single-cell voltage indicates that the maximum single-cell voltage continuously increases, when the maximum single-cell voltage reaches the next overcharge protection level, continue to correct the original charging power boundary of the battery according to the next overcharge correction rate corresponding to the next overcharge protection level; wherein, the next overcharge protection level is higher than the current overcharge protection level; if the change trend of the maximum single-cell voltage indicates that the maximum single-cell voltage stops rising after rising for a second preset duration, obtaining a second correction power within the second preset duration; correcting the original charging power boundary of the battery according to the second correction power; if the change trend of the maximum single-cell voltage indicates that the maximum single-cell voltage continuously decreases and the maximum single-cell voltage is greater than the minimum protection voltage in the target overcharge mapping relationship, when the maximum single-cell voltage reaches the previous overcharge protection level, continue to correct the original charging power boundary of the battery according to the previous overcharge correction slope corresponding to the previous overcharge protection level; wherein, the previous overcharge protection level is lower than the current overcharge protection level; if the maximum single-cell voltage is less than or equal to the minimum protection voltage, restore the corrected charging power boundary according to the second restoration rate.

[0092] In this embodiment, obtain the first overcharge correction rate corresponding to the current overcharge protection level. For example, if the current overcharge protection level is the first-level overcharge protection, the first overcharge correction rate can be 1 kW / s. At this time, correct the original charging power boundary of the battery according to the first overcharge correction rate, that is, at a rate of 1 kW / s. During the process of the power battery correcting the input power at a rate of 1 kW / s, obtain the change trend of the maximum single-cell voltage. Different change trends can adopt different strategies. The change trend of the maximum single-cell voltage can be judged by continuously obtaining the maximum single-cell voltage. For example, a current maximum single-cell voltage can be obtained every 0.1 s or 0.01 s, and the change trend is judged according to the values of multiple consecutive maximum single-cell voltages, without limitation.

[0093] If the change trend of the maximum single-cell voltage indicates that the maximum single-cell voltage is continuously rising, then when the maximum single-cell voltage reaches the next-level overcharge protection level, continue to correct the original charging power boundary of the battery according to the next-level overcharge correction rate corresponding to the next-level overcharge protection level. For example, when the maximum single-cell voltage triggers the second-level overcharge protection, correct it at the second-level correction rate, that is, 5 kW / s, and increase by 5 kW per second on the basis of the original charging power boundary. When the maximum single-cell voltage triggers the third-level overcharge protection, correct it at the third-level correction rate of 10 kW / s, and increase by 10 kW per second on the basis of the original charging power boundary.

[0094] If the change trend of the maximum single-cell voltage indicates that the maximum single-cell voltage stops rising after rising for a second preset duration. For example, the maximum single-cell voltage remains stable and does not continue to rise 15 s after triggering the first-level overcharge protection, and the voltage when it stops rising is still within the range of the first-level overcharge protection, then the second correction power within the second preset duration = 15 s × 1 kW / s = 15 W. Then, correct the original charging power boundary of the battery according to the second correction power, that is, the correction amount remains unchanged at 15 W.

[0095] If the change trend of the maximum cell voltage indicates that the maximum cell voltage continues to decrease and the maximum cell voltage is greater than the minimum protection voltage in the target overcharge mapping relationship, when the maximum cell voltage reaches the upper-level overcharge protection level, the original charging power boundary of the battery is corrected according to the upper-level overcharge correction slope corresponding to the upper-level overcharge protection level. For example, if the current corresponding overcharge protection level is level 2, and the change trend of the maximum cell voltage indicates that the maximum cell voltage continues to decrease and is greater than the minimum protection voltage (taking the minimum protection voltage as 3.4V as an example here), when it drops to 3.6V, the correction of the original charging power boundary of the battery is switched to be carried out according to the correction slope corresponding to overcharge protection level 1. If the maximum cell voltage is less than 3.4V, it indicates that the voltage level of the current battery is normal. At this time, the corrected charging power boundary is restored at the second recovery rate, and the second recovery rate can be, for example, 2kW / s or other values, without limitation.

[0096] It should be noted that the specific numerical values of the various parameters in the above examples do not represent limitations on them, and the values can be adjusted according to needs.

[0097] In one embodiment, correcting the original charging power boundary of the battery according to the overcharge correction rate corresponding to the current overcharge protection level includes: obtaining the total voltage and total current of the power battery; determining the actual charging power according to the total voltage and total current; determining the second excess power value according to the actual charging power and the original charging power boundary of the battery; determining the second power adjustment value for closed-loop control according to the second excess power value; and correcting the original charging power boundary of the battery according to the second power adjustment value and the overcharge correction rate corresponding to the current overcharge protection level.

[0098] In this embodiment, the actual charging power of the battery can be obtained by multiplying the total voltage and total current of the battery, and the actual charging power is compared with the original charging power boundary of the battery to obtain the second excess power value of the charging power exceeding the boundary. The second power adjustment value can be obtained by looking up a table according to the second excess power value or obtained through a preset corresponding relationship. For example, look up the I term (integral term) of the closed-loop PID (Proportional-Integral-Derivative) control through a table, and integrate it over time to obtain the second power adjustment value required for the power closed-loop control of the battery. The greater the excess power, the greater the value obtained by looking up the table, and the faster the accumulated power value increases over time. For example, when the actual charging power of the battery exceeds the charging power boundary, the power correction rate required for the battery power closed-loop is obtained by looking up the table. The more it exceeds, the faster the correction rate. The original charging power boundary of the battery can be corrected simultaneously according to the second power adjustment value and the overcharge correction rate corresponding to the current overcharge protection level to further achieve the protection effect on the battery.

[0099] In the above embodiments, in the following several cases, the voltage of the battery power boundary is not corrected:

[0100] 1. When the engine is in the starting state, the charge and discharge power boundary correction of the battery is not performed. At this time, if the correction of the battery power boundary has been triggered, the current correction amount is maintained until the engine starts successfully.

[0101] 2. When the vehicle is stationary, the power boundary is not corrected.

[0102] 3. When the vehicle is not in a drivable state, no correction is made.

[0103] In a specific embodiment, the battery power boundary control method, such as Figure 3 , includes:

[0104] Step S1, signal acquisition: Collect the total voltage, total current, maximum single-cell voltage, minimum single-cell voltage, and maximum and minimum available power boundaries of the battery. Calculate the actual power of the battery through the total voltage and current of the battery, determine the overcharge protection level of the battery through the maximum single-cell voltage of the battery, determine the over-discharge protection level of the battery through the minimum single-cell voltage of the battery, determine the over-discharge state and power closed-loop correction value of the battery through the maximum available power boundary of the battery, and determine the overcharge state and power closed-loop correction value of the battery through the minimum available power boundary of the battery.

[0105] Step S2, battery power comparison: Determine the power value by which the battery power exceeds the range by comparing the power boundary and the actual power of the battery.

[0106] Step S3, closed-loop power calculation: Calculate the power value that needs to be corrected according to the exceeded range, and this value accumulates over time. According to the exceeded power threshold in Step S2, look up the I term of the closed-loop control in a table, integrate it over time to obtain the power adjustment value required for the battery power closed-loop control. The greater the exceeded power, the larger the value obtained by looking up the table, and the faster the power value accumulated over time increases. For example, when the actual discharge power of the battery exceeds the original discharge power boundary of the battery, look up the power reduction rate required for the battery power closed-loop in a table. The more it exceeds, the faster the reduction rate. For the original charging power boundary of the battery during charging, the processing method is the same and will not be described repeatedly.

[0107] Step S4, Battery Voltage Level Judgment: Determine the protection level of the battery power by comparing the battery cell voltage with the protection voltage threshold. Determine the voltage protection level of the battery power according to the battery cell voltage. When the maximum battery cell voltage exceeds the first-level protection threshold, activate the first-level overcharge protection state. When the maximum battery cell voltage continues to increase and exceeds the second-level overcharge voltage protection threshold, activate the second-level overcharge protection state. When the maximum battery cell voltage continues to increase and is greater than the third-level overcharge protection voltage threshold, activate the third-level overcharge protection state. When the voltage decreases from the third level to less than the second-level voltage protection threshold, the battery overcharge protection level returns to the second level, and so on. For the minimum battery cell voltage, it is used to determine the battery over-discharge level, and its level judgment method is similar to overcharge and will not be described repeatedly.

[0108] Step S5, Calculate the power threshold for voltage correction according to the voltage level of the battery at the corresponding correction slope (i.e., correction rate). According to the battery voltage overcharge or over-discharge protection level in Step S4, activate the corresponding power correction rate, integrate according to time, and obtain the voltage correction power of the battery power boundary. For example, when the second-level over-discharge protection state is detected and activated, the power reduction rate is medium speed, such as 5 kW / s, and accumulates over time. When it is detected that the voltage no longer drops, the power boundary of the battery no longer continues to increase and remains the value of the previous moment until the voltage returns to normal. When the voltage returns to normal and no over-discharge protection level state is activated, the corrected part of the voltage power is restored at a certain rate. For example, when the cumulative correction reaches 15 kW and the battery cell voltage returns to normal, it is restored at a certain rate, such as 2 kW / s, until it is restored to 0. The control method for the maximum battery cell voltage is the same and will not be described repeatedly.

[0109] Step S6, Battery Power Boundary Correction: On the basis of the original power boundary, add the above-mentioned correction power as the final battery power boundary. Add the sum of the cumulative value of the battery power closed-loop control and the cumulative value of the power correction of the battery voltage to the original power boundary of the battery. At this time, it should be noted that the power boundary of the battery cannot reverse after correction, that is, the discharge power can only be corrected to 0 at the lowest and cannot be negative. Similarly, the charging power can only be corrected to 0 and cannot be positive.

[0110] In this embodiment, according to the above control method, by introducing the battery cell voltage signal, after dividing the cell voltage into levels, different-rate power boundary corrections are performed respectively, which can achieve the active control of the battery power. Especially when the battery SOC has a deviation and the power boundary is inaccurate, it can avoid overcharging and over-discharging of the battery to the greatest extent, prevent overvoltage or undervoltage faults of the battery, improve the safety performance of the whole vehicle, and increase the service life of the battery.

[0111] Based on the same inventive concept, a second embodiment of the present application provides a battery power boundary control device, as follows Figure 4 , the device includes:

[0112] An acquisition module 401, configured to acquire the current maximum single-cell voltage and minimum single-cell voltage of the power battery;

[0113] A determination module 402, configured to determine the current over-discharge protection level according to the minimum single-cell voltage and a preset over-discharge mapping relationship, and determine the current over-charge protection level according to the maximum single-cell voltage and a preset over-charge mapping relationship; wherein, the over-discharge mapping relationship is a mapping relationship between the minimum single-cell voltage and the over-discharge protection level, and the over-charge mapping relationship is a mapping relationship between the maximum single-cell voltage and the over-charge protection level;

[0114] An over-discharge correction module 403, configured to correct the original discharge power boundary of the battery according to the over-discharge correction rate corresponding to the current over-discharge protection level in the case of discharging the power battery; wherein, the over-discharge protection level is positively correlated with the over-discharge correction rate;

[0115] An over-charge correction module 404, configured to correct the original charge power boundary of the battery according to the over-charge correction rate corresponding to the current over-charge protection level in the case of charging the power battery; wherein, the over-charge protection level is positively correlated with the over-charge correction rate.

[0116] This device can determine the current over-charge protection level and over-discharge protection level respectively through the maximum single-cell voltage and minimum single-cell voltage of the power battery, so as to correct the original discharge power boundary of the battery according to the over-discharge correction rate corresponding to the over-discharge protection level in the case of discharging, and correct the original charge power boundary of the battery according to the over-charge correction rate corresponding to the over-charge protection level in the case of charging. Since it can actively adjust the charge and discharge power boundaries of the battery, it can avoid over-charging and over-discharging of the battery, protect the battery, improve the battery life and increase the reliability of the whole vehicle.

[0117] As Figure 5 shown, a third embodiment of the present application provides an electronic device, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114. Among them, the processor 111, the communication interface 112, and the memory 113 complete mutual communication through the communication bus 114,

[0118] The memory 113 is used to store a computer program;

[0119] In one embodiment, when the processor 111 is used to execute the program stored in the memory 113, it implements the battery power boundary control method provided in any one of the foregoing method embodiments.

[0120] In the above-mentioned electronic device, the memory and the processor communicate through a communication bus and a communication interface. The communication bus can be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus can be divided into an address bus, a data bus, a control bus, and the like.

[0121] The memory can include a Random Access Memory (RAM), or can also include a non-volatile memory, such as at least one disk memory. Optionally, the memory can also be at least one storage device located far from the aforementioned processor.

[0122] The above-mentioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0123] The fourth embodiment of the present application provides a computer-readable medium having non-volatile program code executable by a processor.

[0124] Optionally, in the embodiment of the present application, the computer-readable medium is configured to store program code for the processor to execute the above method.

[0125] Optionally, the specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be elaborated herein.

[0126] When the embodiment of the present application is specifically implemented, it can refer to the above embodiments and has corresponding technical effects.

[0127] It will be understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For a hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions of the present application, or a combination thereof.

[0128] For a software implementation, the techniques herein can be implemented by units executing functions herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented within the processor or external to the processor.

[0129] Those of ordinary skill in the art will appreciate that the units and algorithm steps of the examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A professional technician can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present application.

[0130] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0131] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules is only a logical function division, and there can be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings or direct couplings or communication connections shown or discussed with each other can be through some interfaces, and the indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0132] The unit described as a separate component may or may not be physically separated. The component presented as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed across multiple network units. Some or all of these units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] In addition, in each embodiment of this application, each functional unit may be integrated into one processing unit, may exist separately as individual physical units, or two or more units may be integrated into one unit.

[0134] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs that can store program codes.

[0135] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0136] The above embodiments are only preferred embodiments given to fully illustrate this application, and the protection scope of this application is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of this application are all within the protection scope of this application.

Claims

1. A battery power boundary control method, characterized in that, The method includes: Obtaining the maximum single-cell voltage and the minimum single-cell voltage of the power battery currently; Determining the current over-discharge protection level according to the minimum single-cell voltage and a preset over-discharge mapping relationship, and determining the current over-charge protection level according to the maximum single-cell voltage and a preset over-charge mapping relationship; wherein, the over-discharge mapping relationship is the mapping relationship between the minimum single-cell voltage and the over-discharge protection level, and the over-charge mapping relationship is the mapping relationship between the maximum single-cell voltage and the over-charge protection level; In the case of the power battery discharging, correcting the original battery discharge power boundary according to the over-discharge correction rate corresponding to the current over-discharge protection level; wherein, the over-discharge protection level is positively correlated with the over-discharge correction rate; In the case of the power battery charging, correcting the original battery charging power boundary according to the over-charge correction rate corresponding to the current over-charge protection level; wherein, the over-charge protection level is positively correlated with the over-charge correction rate.

2. The method according to claim 1, characterized in that, Obtaining the maximum single-cell voltage and the minimum single-cell voltage of the power battery currently includes: Obtaining the single-cell voltage corresponding to each battery cell of the power battery currently; Determining the maximum single-cell voltage and the minimum single-cell voltage from all the single-cell voltages.

3. The method according to claim 1, wherein Determining the current over-discharge protection level according to the minimum single-cell voltage and a preset over-discharge mapping relationship includes: Determining the target over-discharge mapping relationship corresponding to the power battery according to the battery type and voltage platform of the power battery; Determining the current over-discharge protection level according to the minimum single-cell voltage and the target over-discharge mapping relationship; wherein, the smaller the minimum single-cell voltage is, the higher the corresponding over-discharge protection level is.

4. The method according to claim 3, characterized in that, Correcting the original battery discharge power boundary according to the over-discharge correction rate corresponding to the current over-discharge protection level includes: Obtaining the first over-discharge correction rate corresponding to the current over-discharge protection level; Correcting the original battery discharge power boundary according to the first over-discharge correction rate, so that the power battery controls the output power according to the corrected discharge power boundary; During the process that the power battery controls the output power according to the corrected discharge power boundary, obtaining the change trend of the minimum single-cell voltage; If the change trend of the minimum single-cell voltage indicates that the minimum single-cell voltage continues to decrease, then when the minimum single-cell voltage reaches the next over-discharge protection level, continue to correct the original battery discharge power boundary according to the next over-discharge correction rate corresponding to the next over-discharge protection level; wherein, the next over-discharge protection level is higher than the current over-discharge protection level; If the change trend of the minimum single-cell voltage indicates that the minimum single-cell voltage stops decreasing after dropping for a first preset duration, then obtaining the first correction power within the first preset duration; correcting the original battery discharge power boundary according to the first correction power; If the change trend of the minimum cell voltage indicates that the minimum cell voltage continues to rise, and the minimum cell voltage is less than the maximum protection voltage in the target over-discharge mapping relationship, when the minimum cell voltage reaches the previous over-discharge protection level, the original battery discharge power boundary is corrected continuously according to the previous over-discharge correction slope corresponding to the previous over-discharge protection level; wherein, the previous over-discharge protection level is lower than the current over-discharge protection level; If the minimum cell voltage is greater than or equal to the maximum protection voltage, the corrected discharge power boundary is restored at the first restoration rate.

5. The method according to claim 3, wherein Correcting the original battery discharge power boundary according to the over-discharge correction rate corresponding to the current over-discharge protection level includes: Obtaining the total voltage and total current of the power battery; Determining the actual power consumption according to the total voltage and total current; Determining a first excess power value according to the actual power consumption and the original battery discharge power boundary; Determining a first power adjustment value for closed-loop control according to the first excess power value; Correcting the original battery discharge power boundary according to the first power adjustment value and the over-discharge correction rate corresponding to the current over-discharge protection level.

6. The method according to claim 1, characterized in that Determining the current overcharge protection level according to the maximum cell voltage and a preset overcharge mapping relationship includes: Determining the target overcharge mapping relationship corresponding to the power battery according to the battery type and voltage platform of the power battery; Determining the current overcharge protection level according to the maximum cell voltage and the target overcharge mapping relationship; wherein, the greater the maximum cell voltage, the higher the corresponding overcharge protection level.

7. The method according to claim 6, wherein Correcting the original battery charge power boundary according to the overcharge correction rate corresponding to the current overcharge protection level includes: Obtaining a first overcharge correction rate corresponding to the current over-discharge protection level; Correcting the original battery charge power boundary according to the first overcharge correction rate so that the power battery controls the input power according to the corrected charge power boundary; During the process that the power battery controls the input power according to the corrected charge power boundary, obtaining the change trend of the maximum cell voltage; If the change trend of the maximum cell voltage indicates that the maximum cell voltage continues to increase, when the maximum cell voltage reaches the next overcharge protection level, the original battery charge power boundary is corrected continuously according to the next overcharge correction slope corresponding to the next overcharge protection level; wherein, the next overcharge protection level is higher than the current overcharge protection level; If the change trend of the maximum cell voltage indicates that the maximum cell voltage stops rising after rising for a second preset duration, obtaining a second correction power within the second preset duration; correcting the original battery charge power boundary according to the second correction power; If the change trend of the maximum single-cell voltage indicates that the maximum single-cell voltage continues to decrease, and the maximum single-cell voltage is greater than the minimum protection voltage in the target overcharge mapping relationship, when the maximum single-cell voltage reaches the upper-level overcharge protection level, the original charging power boundary of the battery is continuously corrected according to the upper-level overcharge correction slope corresponding to the upper-level overcharge protection level; wherein, the upper-level overcharge protection level is lower than the current overcharge protection level; If the maximum single-cell voltage is less than or equal to the minimum protection voltage, the corrected charging power boundary is restored at the second restoration rate.

8. The method according to claim 6, wherein Correcting the original charging power boundary of the battery according to the overcharge correction rate corresponding to the current overcharge protection level includes: Obtaining the total voltage and total current of the power battery; Determining the actual charging power according to the total voltage and total current; Determining a second excess power value according to the actual charging power and the original charging power boundary of the battery; Determining a second power adjustment value for closed-loop control according to the second excess power value; Correcting the original charging power boundary of the battery according to the second power adjustment value and the overcharge correction rate corresponding to the current overcharge protection level.

9. A battery power boundary control device, characterized in that, The device includes: An acquisition module, configured to acquire the current maximum single-cell voltage and minimum single-cell voltage of the power battery; A determination module, configured to determine the current over-discharge protection level according to the minimum single-cell voltage and a preset over-discharge mapping relationship, and determine the current overcharge protection level according to the maximum single-cell voltage and a preset overcharge mapping relationship; wherein, the over-discharge mapping relationship is a mapping relationship between the minimum single-cell voltage and the over-discharge protection level, and the overcharge mapping relationship is a mapping relationship between the maximum single-cell voltage and the overcharge protection level; An over-discharge correction module, configured to correct the original discharge power boundary of the battery according to the over-discharge correction rate corresponding to the current over-discharge protection level when the power battery is discharging; wherein, the over-discharge protection level is positively correlated with the over-discharge correction rate; An overcharge correction module, configured to correct the original charging power boundary of the battery according to the overcharge correction rate corresponding to the current overcharge protection level when the power battery is charging; wherein, the overcharge protection level is positively correlated with the overcharge correction rate.

10. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete communication with each other through the communication bus; The memory is used for storing a computer program; The processor is configured to implement the method according to any one of claims 1-8 when executing the program stored on the memory.

11. A vehicle, characterized in that, The vehicle applies the method according to any one of claims 1-8.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1-8 is implemented.

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