A calculation method and system for the percentage of the dischargeable power of a battery

Abstract

The present application discloses a method and system for calculating the percentage of the dischargeable power of a battery. The method includes: performing a single charge and discharge on the battery to obtain a relationship table between the actual capacity of the battery, the discharged power, and the battery voltage; detecting the current voltage value of the battery; obtaining a voltage remaining power value according to the current voltage value and the relationship table between the discharged power and the battery voltage; performing integral calculation on the discharge voltage change curve according to the current voltage value to obtain an integral remaining power value; calculating the percentage of the dischargeable power of the voltage and the percentage of the dischargeable power of the integral; calculating the difference between the two percentages; when the difference is less than the deviation threshold, using the percentage of the dischargeable power of the voltage or the percentage of the dischargeable power of the integral as the percentage of the dischargeable power of the battery; when the difference is not less than the deviation threshold, performing deviation correction to calculate the percentage of the dischargeable power of the battery. The present application solves the problem of inaccurate calculation results of the percentage of the dischargeable power of the battery.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a method and system for calculating the percentage of available charge of a battery. Background Art

[0002] Battery capacity represents the amount of charge that a battery can discharge under predetermined discharge conditions; the rated capacity refers to the minimum capacity that should be discharged under certain discharge conditions according to industry regulations; the actual capacity refers to the amount of charge actually discharged by the battery during actual operation.

[0003] In practical applications, the percentage of available charge of a battery refers to the percentage of the remaining charge to the battery capacity. Generally, the calculation methods for the percentage of available charge include the integration method or the voltage method. The integration method depends on the evaluation of battery capacity, which is affected by battery active materials and discharge conditions, and there will also be cumulative error problems due to recording the charge and discharge amounts during multiple cycles, resulting in inaccurate calculation results for the percentage of available charge of the battery; when calculating using the voltage method, there will be problems such as sudden voltage drops or sudden increases in charging voltage when the load is applied, resulting in inaccurate calculation results for the percentage of available charge of the battery. Summary of the Invention

[0004] To solve the problem of inaccurate calculation results for the percentage of available charge of a battery, this application provides a method and system for calculating the percentage of available charge of a battery.

[0005] In a first aspect, this application provides a method for calculating the percentage of available charge of a battery, adopting the following technical solution:

[0006] Perform a single charge and discharge on the battery to obtain the discharged charge information and the discharge voltage change curve during the charge and discharge process;

[0007] Obtain the actual battery capacity and the relationship table between the discharged charge and the battery voltage based on the discharged charge information;

[0008] Detect the current voltage value of the battery;

[0009] Obtain the voltage remaining charge value based on the current voltage value and the relationship table between the discharged charge and the battery voltage;

[0010] Perform integral calculation on the discharge voltage change curve based on the current voltage value to obtain the integral remaining charge value;

[0011] Calculate the voltage available charge percentage based on the voltage remaining charge value and the actual battery capacity, and calculate the integral available charge percentage based on the integral remaining charge value and the actual battery capacity;

[0012] Calculate the difference between the percentage of charge that can be released based on voltage and the percentage of charge that can be released based on integration;

[0013] When the difference is less than the deviation threshold, use either the percentage of charge that can be released based on voltage or the percentage of charge that can be released based on integration as the percentage of charge that the battery can release;

[0014] When the difference is not less than the deviation threshold, perform deviation correction on the percentage of charge that can be released based on voltage and the percentage of charge that can be released based on integration, and calculate the percentage of charge that the battery can release.

[0015] Optionally, perform one charge-discharge cycle on the battery to obtain the charge release information and the discharge voltage change curve during the charge-discharge process, including:

[0016] Charge the battery at a constant current with a preset upper limit current value;

[0017] When the preset upper limit cut-off voltage value is reached, maintain the preset upper limit cut-off voltage value for constant voltage charging;

[0018] When the charging current reaches the preset lower limit current value, stop the charging process;

[0019] Discharge the battery at a constant current through the preset upper limit current value;

[0020] When the discharge voltage reaches the preset lower limit cut-off voltage, stop the discharge process, and record the charge release information and the discharge voltage change curve. The charge release information includes the total charge released and the charge release value and the corresponding battery voltage value.

[0021] Optionally, obtain the actual capacity of the battery and the charge release vs. battery voltage relationship table based on the charge release information, including:

[0022] Obtain the total charge released and the charge release value and the corresponding battery voltage value based on the charge release information;

[0023] Use the total charge released as the actual capacity of the battery;

[0024] Obtain the charge release vs. battery voltage relationship table based on the charge release value and the corresponding battery voltage value.

[0025] Optionally, obtain the remaining charge value based on the current voltage value and the charge release vs. battery voltage relationship table, including:

[0026] Determine the corresponding target charge release value from the charge release vs. battery voltage relationship table based on the current voltage value;

[0027] Subtract the target charge release value from the total charge released to obtain the remaining charge value based on voltage.

[0028] Optionally, perform deviation correction on the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration, and calculate the percentage of charge that can be discharged by the battery, including:

[0029] Calculate the average value of the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration;

[0030] Use the average value as the percentage of charge that can be discharged by the battery.

[0031] Optionally, after performing a charge and discharge on the battery and obtaining the charge discharge information and the discharge voltage change curve during the charge and discharge process, it further includes:

[0032] Obtain the charge and discharge temperature value during the charge and discharge process;

[0033] After detecting the current voltage value of the battery, it further includes:

[0034] Detect the current ambient temperature value and the historical usage times of the battery.

[0035] Optionally, perform deviation correction on the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration, and calculate the percentage of charge that can be discharged by the battery, including:

[0036] Calculate the ratio of the current ambient temperature value to the charge and discharge temperature value;

[0037] Obtain the battery fatigue degree based on the historical usage times;

[0038] Adjust the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration respectively according to the ratio and the battery fatigue degree;

[0039] Normalize the adjusted percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration to obtain the first weight value of the percentage of charge that can be discharged by voltage and the second weight value of the percentage of charge that can be discharged by integration;

[0040] Calculate the percentage of charge that can be discharged by the battery according to the percentage of charge that can be discharged by voltage, the first weight value, the percentage of charge that can be discharged by integration, and the second weight value.

[0041] In a second aspect, the present application provides a calculation system for the percentage of charge that can be discharged by a battery, adopting the following technical solution:

[0042] A charge and discharge module, configured to perform a charge and discharge on the battery once to obtain the charge discharge information and the discharge voltage change curve during the charge and discharge process;

[0043] A relationship table generation module, configured to obtain the actual capacity of the battery and the relationship table between the charge discharge and the battery voltage according to the charge discharge information;

[0044] A detection module for detecting the current voltage value of the battery;

[0045] A processing module for obtaining the remaining voltage charge value according to the current voltage value and the relationship table between the discharged charge and the battery voltage; performing integral calculation on the discharge voltage change curve according to the current voltage value to obtain the integral remaining charge value; calculating the percentage of the voltage-dischargeable charge according to the remaining voltage charge value and the actual capacity of the battery, and calculating the percentage of the integral-dischargeable charge according to the integral remaining charge value and the actual capacity of the battery; calculating the difference between the percentage of the voltage-dischargeable charge and the percentage of the integral-dischargeable charge; when the difference is less than the deviation threshold, taking the percentage of the voltage-dischargeable charge or the percentage of the integral-dischargeable charge as the percentage of the battery-dischargeable charge; when the difference is not less than the deviation threshold, performing deviation correction on the percentage of the voltage-dischargeable charge and the percentage of the integral-dischargeable charge, and calculating the percentage of the battery-dischargeable charge.

[0046] In summary, the present application includes the following beneficial technical effects:

[0047] Perform a charge and discharge on the battery to obtain the discharged charge information and the discharge voltage change curve during the charge and discharge process; obtain the actual capacity of the battery and the relationship table between the discharged charge and the battery voltage according to the discharged charge information; when the battery is unloaded, detect the current voltage value of the battery; obtain the remaining voltage charge value according to the current voltage value and the relationship table between the discharged charge and the battery voltage; perform integral calculation on the discharge voltage change curve according to the current voltage value to obtain the integral remaining charge value; calculate the percentage of the voltage-dischargeable charge according to the remaining voltage charge value and the actual capacity of the battery, and calculate the percentage of the integral-dischargeable charge according to the integral remaining charge value and the actual capacity of the battery; calculate the difference between the percentage of the voltage-dischargeable charge and the percentage of the integral-dischargeable charge; when the difference is less than the deviation threshold, taking the percentage of the voltage-dischargeable charge or the percentage of the integral-dischargeable charge as the percentage of the battery-dischargeable charge; when the difference is not less than the deviation threshold, performing deviation correction on the percentage of the voltage-dischargeable charge and the percentage of the integral-dischargeable charge, and calculating the percentage of the battery-dischargeable charge. Only need to perform a charge and discharge on the battery, avoiding the problem of cumulative error caused by cyclic charge and discharge in the existing integral method; and when calculating the percentage of the battery-dischargeable charge, there is no need to consider the load, avoiding the problem of sudden voltage drop or sudden increase in charging voltage when there is a load in the existing voltage method. Therefore, the calculation accuracy of the percentage of the battery-dischargeable charge is improved. Description of the Drawings

[0048] Figure 1 is a schematic flow chart of the calculation method of the percentage of the battery-dischargeable charge of the present application.

[0049] Figure 2 is a schematic flow chart of the first deviation correction method of the present application.

[0050] Figure 3 It is a schematic flow chart of the second deviation correction method of this application.

[0051] Figure 4 It is a schematic structural diagram of the calculation system for the percentage of the battery's available discharge capacity of this application. Detailed implementation manners

[0052] In order to make the objectives, technical solutions and advantages of this application clearer, the following further details this application through the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0053] The embodiments of this application disclose a calculation method for the percentage of the battery's available discharge capacity.

[0054] Referring to Figure 1 , the method includes:

[0055] 101. Perform a single charge and discharge on the battery to obtain the discharge capacity information and the discharge voltage change curve during the charge and discharge process;

[0056] Among them, the specific process of performing a single charge and discharge on the battery is:

[0057] Perform constant current charging on the battery with a preset upper limit current value;

[0058] When reaching the preset upper limit cut-off voltage value, maintain the preset upper limit cut-off voltage value for constant voltage charging;

[0059] When the charging current reaches the preset lower limit current value, stop the charging process;

[0060] Perform constant current discharge through the preset upper limit current value;

[0061] When the discharge voltage reaches the preset lower limit cut-off voltage, stop the discharge process;

[0062] During the above single charge and discharge process, record the discharge capacity information and the discharge voltage change curve. The discharge capacity information includes the total discharge capacity and the discharge capacity value and the corresponding battery voltage value.

[0063] 102. Obtain the actual capacity of the battery and the relationship table between the discharge capacity and the battery voltage according to the discharge capacity information;

[0064] Among them, since the discharge capacity information includes the total discharge capacity and the discharge capacity value and the corresponding battery voltage value, the total discharge capacity can be used as the actual capacity of the battery, and the relationship table between the discharge capacity and the battery voltage can be obtained according to the discharge capacity value and the corresponding battery voltage value.

[0065] 103. Detect and obtain the current voltage value of the battery;

[0066] Among them, by connecting the positive and negative poles of the battery, the current voltage value of the battery can be detected.

[0067] 104, obtaining a voltage remaining power value according to the current voltage value and a table showing a relationship between the discharged power and the battery voltage;

[0068] Among them, according to the current voltage value, a table of relationship between discharged power and battery voltage is looked up to determine the corresponding target discharged power value, and the target discharged power value is subtracted from the total discharged power value to obtain the voltage remaining power value.

[0069] 105, performing integral calculation on the discharge voltage variation curve according to the current voltage value to obtain an integral remaining power value;

[0070] The discharge voltage change curve is composed of changing discharge voltage values. The numerical points in the discharge voltage change curve are determined by the current voltage value, and the numerical points in the discharge voltage change curve are integrated to obtain the integral remaining power value.

[0071] 106, calculating the percentage of dischargeable power according to the voltage remaining power value and the actual capacity of the battery, and calculating the percentage of dischargeable power according to the integral remaining power value and the actual capacity of the battery;

[0072] 107, calculate the difference between the percentage of dischargeable electricity of voltage and the percentage of dischargeable electricity of integration;

[0073] 108, when the difference is less than the deviation threshold, the voltage dischargeable power percentage or the integrated dischargeable power percentage is used as the battery dischargeable power percentage;

[0074] Among them, when the difference is less than the deviation threshold, it means that the voltage dischargeable power percentage and the integral dischargeable power percentage are both accurate, and you can arbitrarily select one as the battery dischargeable power percentage.

[0075] 109, when the difference is not less than the deviation threshold, the voltage dischargeable power percentage and the integral dischargeable power percentage are subjected to deviation correction to calculate the battery dischargeable power percentage.

[0076] Among them, when the difference is not less than the deviation threshold, it is necessary to perform deviation correction on the voltage dischargeable power percentage and the integral dischargeable power percentage, so as to reduce the inaccuracy of the battery dischargeable power percentage caused by the excessive difference.

[0077] The implementation principle of this embodiment is:

[0078] Perform a charge-discharge cycle on the battery to obtain the discharged power information and the discharge voltage change curve during the charge-discharge process; obtain the actual battery capacity and the relationship table between the discharged power and the battery voltage based on the discharged power information; detect the current voltage value of the battery; obtain the remaining power value corresponding to the voltage based on the current voltage value and the relationship table between the discharged power and the battery voltage; perform integral calculation on the discharge voltage change curve according to the current voltage value to obtain the remaining power value obtained by integration; calculate the percentage of the power that can be discharged corresponding to the voltage based on the remaining power value corresponding to the voltage and the actual battery capacity, and calculate the percentage of the power that can be discharged obtained by integration based on the remaining power value obtained by integration and the actual battery capacity; calculate the difference between the percentage of the power that can be discharged corresponding to the voltage and the percentage of the power that can be discharged obtained by integration; when the difference is less than the deviation threshold, use either the percentage of the power that can be discharged corresponding to the voltage or the percentage of the power that can be discharged obtained by integration as the percentage of the power that can be discharged by the battery; when the difference is not less than the deviation threshold, perform deviation correction on the percentage of the power that can be discharged corresponding to the voltage and the percentage of the power that can be discharged obtained by integration, and calculate the percentage of the power that can be discharged by the battery. Only one charge-discharge cycle is required for the battery, avoiding the problem of cumulative error caused by cyclic charge-discharge in the existing integration method; and when calculating the percentage of the power that can be discharged by the battery, the load does not need to be considered, avoiding the problem of sudden voltage drop or sudden increase in charging voltage when there is a load in the existing voltage method. Therefore, the calculation accuracy of the percentage of the power that can be discharged by the battery is improved.

[0079] In the above Figure 1 shown embodiment, the deviation correction methods in step 109 mainly include two types. The first is the average calculation method, and the second is the weighted calculation method, which will be specifically described through the following Figure 2 and Figure 3 embodiments.

[0080] As Figure 2 shown, performing deviation correction on the percentage of the power that can be discharged corresponding to the voltage and the percentage of the power that can be discharged obtained by integration, and calculating the percentage of the power that can be discharged by the battery includes:

[0081] 201. Calculate the average value of the percentages of the power that can be discharged corresponding to the voltage and the percentage of the power that can be discharged obtained by integration;

[0082] 202. Use the average value as the percentage of the power that can be discharged by the battery.

[0083] The implementation principle of this embodiment is:

[0084] By using the average value method, the error caused by too large a difference between the percentage of the power that can be discharged corresponding to the voltage and the percentage of the power that can be discharged obtained by integration can be reduced. Using the average value as the percentage of the power that can be discharged by the battery can improve the accuracy of the percentage of the power that can be discharged by the battery.

[0085] When performing Figure 3Before the embodiment, it is also necessary to perform a charge and discharge on the battery once. After obtaining the discharged power information and the discharge voltage change curve during the charge and discharge process, the charge and discharge temperature values during the charge and discharge process are obtained; and after detecting the current voltage value of the battery, the current ambient temperature value and the historical usage times of the battery are detected.

[0086] As Figure 3 shown, deviation correction is performed on the voltage available discharge percentage and the integrated available discharge percentage, and the available discharge percentage of the battery is calculated, including:

[0087] 301. Calculate the ratio of the current ambient temperature value to the charge and discharge temperature value;

[0088] Among them, the current ambient temperature value is V1, and the charge and discharge temperature value is V0. When the temperature values are different, it will affect the voltage value of the battery. Then, V1 / V2 is obtained, and the ratio A = V1 / V2.

[0089] 302. Obtain the battery fatigue degree according to the historical usage times;

[0090] Among them, according to the production process, materials and other parameters of each battery, the usage fatigue degree of the battery can be determined. What is related to the fatigue degree is the usage times. Then, according to the historical usage times, the battery fatigue degree can be determined, and the battery fatigue degree is related to the battery capacity.

[0091] 303. Adjust the voltage available discharge percentage and the integrated available discharge percentage respectively according to the ratio and the battery fatigue degree;

[0092] Among them, the current voltage value is adjusted by the ratio, and the actual battery power is adjusted by the battery fatigue degree, thereby indirectly realizing the adjustment of the voltage available discharge percentage and the integrated available discharge percentage.

[0093] 304. Normalize the adjusted voltage available discharge percentage and the integrated available discharge percentage to obtain the first weight value of the voltage available discharge percentage and the second weight value of the integrated available discharge percentage;

[0094] 305. Calculate the available discharge percentage of the battery according to the voltage available discharge percentage, the first weight value, the integrated available discharge percentage and the second weight value.

[0095] Among them, the voltage available discharge percentage is multiplied by the first weight value, the integrated available discharge percentage is multiplied by the second weight value, and then added to obtain the available discharge percentage of the battery.

[0096] The implementation principle of this embodiment is:

[0097] Taking temperature and battery fatigue as adjustment factors, and then performing normalization to set the weighted values, reduces the influence of ambient temperature and the battery itself, and improves the accuracy of calculation.

[0098] The above is an embodiment of the calculation method for the percentage of the dischargeable battery capacity of the present application. Next, the calculation system for the percentage of the dischargeable battery capacity will be described through embodiments. As Figure 4 shown, the present application provides a calculation system for the percentage of the dischargeable battery capacity, including:

[0099] A charge and discharge module 401, configured to perform a single charge and discharge on the battery, and obtain the discharged capacity information and the discharge voltage change curve during the charge and discharge process;

[0100] A relationship table generation module 402, configured to obtain the actual battery capacity and the relationship table between the discharged capacity and the battery voltage according to the discharged capacity information;

[0101] A detection module 403, configured to detect and obtain the current voltage value of the battery;

[0102] A processing module 404, configured to obtain the remaining voltage capacity value according to the current voltage value and the relationship table between the discharged capacity and the battery voltage; perform integral calculation on the discharge voltage change curve according to the current voltage value to obtain the integral remaining capacity value; calculate the percentage of the dischargeable voltage capacity according to the remaining voltage capacity value and the actual battery capacity, and calculate the percentage of the dischargeable integral capacity according to the integral remaining capacity value and the actual battery capacity; calculate the difference between the percentage of the dischargeable voltage capacity and the percentage of the dischargeable integral capacity; when the difference is less than the deviation threshold, use the percentage of the dischargeable voltage capacity or the percentage of the dischargeable integral capacity as the percentage of the dischargeable battery capacity; when the difference is not less than the deviation threshold, perform deviation correction on the percentage of the dischargeable voltage capacity and the percentage of the dischargeable integral capacity, and calculate the percentage of the dischargeable battery capacity.

[0103] The implementation principle of this embodiment is:

[0104] The charge and discharge module 401 performs a single charge and discharge on the battery to obtain the discharged power information and the discharge voltage change curve during the charge and discharge process; the relationship table generation module 402 obtains the actual battery capacity and the relationship table between the discharged power and the battery voltage based on the discharged power information; the detection module 403 detects the current voltage value of the battery; the processing module 404 obtains the remaining voltage power value according to the current voltage value and the relationship table between the discharged power and the battery voltage; performs integral calculation on the discharge voltage change curve according to the current voltage value to obtain the integral remaining power value; calculates the percentage of the dischargeable power of the voltage according to the remaining voltage power value and the actual battery capacity, and calculates the percentage of the dischargeable power of the integral according to the integral remaining power value and the actual battery capacity; calculates the difference between the percentage of the dischargeable power of the voltage and the percentage of the dischargeable power of the integral; when the difference is less than the deviation threshold, uses the percentage of the dischargeable power of the voltage or the percentage of the dischargeable power of the integral as the percentage of the dischargeable power of the battery; when the difference is not less than the deviation threshold, corrects the deviation of the percentage of the dischargeable power of the voltage and the percentage of the dischargeable power of the integral, and calculates the percentage of the dischargeable power of the battery. Only a single charge and discharge of the battery is required, avoiding the problem of cumulative error caused by cyclic charge and discharge in the existing integration method; and when calculating the percentage of the dischargeable power of the battery, the load does not need to be considered, avoiding the problem of sudden voltage drop or sudden increase in charging voltage when there is a load in the existing voltage method. Therefore, the calculation accuracy of the percentage of the dischargeable power of the battery is improved.

[0105] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Any feature disclosed in this specification (including the abstract and drawings), unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example of a series of equivalent or similar features.

Claims

1. A method for calculating the percentage of the dischargeable power of a battery, characterized in that, Including: Performing a charge-discharge cycle on the battery to obtain the discharged charge information and the discharge voltage change curve during the charge-discharge process; Obtaining the actual battery capacity and the relationship table between the discharged charge and the battery voltage based on the discharged charge information; Detecting the current voltage value of the battery; Obtaining the remaining charge value based on the current voltage value and the relationship table between the discharged charge and the battery voltage; Performing integral calculation on the discharge voltage change curve based on the current voltage value to obtain the integral remaining charge value; Calculating the percentage of the charge that can be discharged based on the voltage according to the remaining charge value based on the voltage and the actual battery capacity, and calculating the percentage of the charge that can be discharged based on the integral according to the integral remaining charge value and the actual battery capacity; Calculating the difference between the percentage of the charge that can be discharged based on the voltage and the percentage of the charge that can be discharged based on the integral; When the difference is less than the deviation threshold, using the percentage of the charge that can be discharged based on the voltage or the percentage of the charge that can be discharged based on the integral as the percentage of the charge that can be discharged by the battery; When the difference is not less than the deviation threshold, performing deviation correction on the percentage of the charge that can be discharged based on the voltage and the percentage of the charge that can be discharged based on the integral, and calculating the percentage of the charge that can be discharged by the battery; Among them, the performing deviation correction on the percentage of the charge that can be discharged based on the voltage and the percentage of the charge that can be discharged based on the integral, and calculating the percentage of the charge that can be discharged by the battery includes: Calculating the average value of the percentage of the charge that can be discharged based on the voltage and the percentage of the charge that can be discharged based on the integral; Using the average value as the percentage of the charge that can be discharged by the battery.

2. The calculation method of the percentage of the dischargeable power of the battery according to claim 1, characterized in that, The performing a charge-discharge cycle on the battery to obtain the discharged charge information and the discharge voltage change curve during the charge-discharge process includes: Performing constant current charging on the battery with a preset upper limit current value; When reaching the preset upper limit cut-off voltage value, maintaining the preset upper limit cut-off voltage value for constant voltage charging; When the charging current reaches the preset lower limit current value, stopping the charging process; Performing constant current discharge through the preset upper limit current value; When the discharge voltage reaches the preset lower limit cut-off voltage, stopping the discharge process, and recording the discharged charge information and the discharge voltage change curve, where the discharged charge information includes the total discharged charge value and the discharged charge value and the corresponding battery voltage value.

3. The method for calculating the percentage of the dischargeable electric quantity of the battery according to claim 2, wherein, The obtaining the actual battery capacity and the relationship table between the discharged charge and the battery voltage based on the discharged charge information includes: Obtaining the total discharged charge value and the discharged charge value and the corresponding battery voltage value based on the discharged charge information; Using the total discharged charge value as the actual battery capacity; Obtaining the relationship table between the discharged charge and the battery voltage based on the discharged charge value and the corresponding battery voltage value.

4. The method for calculating the percentage of the available battery capacity according to claim 3, wherein, The obtaining the remaining charge value based on the current voltage value and the relationship table between the discharged charge and the battery voltage includes: Determining the corresponding target discharged charge value from the relationship table between the discharged charge and the battery voltage based on the current voltage value; Subtracting the target discharged charge value from the total discharged charge value to obtain the remaining charge value based on the voltage.

5. The calculation method of the percentage of the dischargeable power of the battery according to claim 1, wherein After performing a charge-discharge cycle on the battery to obtain the discharged charge information and the discharge voltage change curve during the charge-discharge process, it further includes: Obtaining the charge-discharge temperature value during the charge-discharge process; After detecting the current voltage value of the battery, the following steps are further included: Detecting the current ambient temperature value and the historical usage times of the battery.

6. The calculation method of the percentage of the battery's dischargeable power according to claim 5, characterized in that, The deviation correction of the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration, and calculating the percentage of charge that can be discharged by the battery, includes: Calculating the ratio of the current ambient temperature value to the charge and discharge temperature value; Obtaining the battery fatigue degree according to the historical usage times; Adjusting the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration respectively according to the ratio and the battery fatigue degree; Normalizing the adjusted percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration to obtain the first weight value of the percentage of charge that can be discharged by voltage and the second weight value of the percentage of charge that can be discharged by integration; Calculating the percentage of charge that can be discharged by the battery according to the percentage of charge that can be discharged by voltage, the first weight value, the percentage of charge that can be discharged by integration, and the second weight value.

7. A calculation system for the percentage of the dischargeable electric quantity of a battery, characterized in that Including: A charge and discharge module for performing a single charge and discharge on the battery to obtain the discharged charge information and the discharge voltage change curve during the charge and discharge process; A relationship table generation module for obtaining the actual battery capacity and the relationship table between the discharged charge and the battery voltage according to the discharged charge information; A detection module for detecting the current voltage value of the battery; A processing module for obtaining the remaining charge value by voltage according to the current voltage value and the relationship table between the discharged charge and the battery voltage; performing integral calculation on the discharge voltage change curve according to the current voltage value to obtain the remaining charge value by integration; calculating the percentage of charge that can be discharged by voltage according to the remaining charge value by voltage and the actual battery capacity, and calculating the percentage of charge that can be discharged by integration according to the remaining charge value by integration and the actual battery capacity; calculating the difference between the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration; When the difference is less than the deviation threshold, using the percentage of charge that can be discharged by voltage or the percentage of charge that can be discharged by integration as the percentage of charge that can be discharged by the battery; when the difference is not less than the deviation threshold, performing deviation correction on the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration, and calculating the percentage of charge that can be discharged by the battery; Among them, the deviation correction of the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration, and calculating the percentage of charge that can be discharged by the battery, includes: Calculating the average value of the percentages of the percentage of charge that can be discharged by voltage and the percentage of charge that can be discharged by integration; Taking the average value as the percentage of charge that can be discharged by the battery.

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