Battery capacity determination method, electronic device, vehicle, medium and program product

Abstract

The invention discloses a battery capacity determination method, an electronic device, a vehicle, a computer readable storage medium and a computer program product. The determination method comprises the steps that the second capacity of the battery is determined according to the first capacity, the first capacity is determined by charging the battery with the state of charge lower than a set threshold value, and the second capacity is the capacity of the battery at a voltage inflection point; and determining the battery capacity according to the second capacity. According to the determination method, the second capacity of the battery is determined according to the first capacity, so that the capacity of the inflection point of the battery can be dynamically updated, and the capacity of the current inflection point of the battery is determined. When the first capacity cannot be determined subsequently, the current capacity of the battery can be determined according to the second capacity. Moreover, the determined current capacity can be aligned with the first capacity through the second capacity, and capacity drift caused by inconsistent capacity calculation methods can be avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a method for determining battery capacity, an electronic device, a vehicle, a computer-readable storage medium, and a computer program product. Background Art

[0002] Battery health state (SOH) is one of the important parameters for evaluating battery performance. SOH can be tracked to determine when to terminate the battery's service life. SOH is usually defined as the ratio between the battery capacity and its initial capacity within a given time. When determining SOH, the current battery capacity needs to be determined. Based on the capacity value of the battery at the inflection point, the current battery capacity can be determined. Therefore, a method is needed to determine the capacity value of the battery at the inflection point. Summary of the invention

[0003] The present application provides a method for determining battery capacity, an electronic device, a vehicle, a computer-readable storage medium, and a computer program product.

[0004] The present application provides a method for determining battery capacity, the method comprising:

[0005] Determine a second capacity of the battery according to the first capacity, wherein the first capacity is a battery capacity determined based on a preset method, and the second capacity is a capacity of the battery at a voltage inflection point;

[0006] The battery capacity is determined according to the second capacity.

[0007] Thus, in the method for determining battery capacity, the electronic device, the vehicle, the computer-readable storage medium, and the computer program product, by determining the second capacity of the battery according to the first capacity, the battery inflection point capacity can be updated, thereby determining the capacity at the current battery inflection point. When the first capacity cannot be determined subsequently, the current capacity of the battery can be determined according to the second capacity. Moreover, the determined current capacity can be aligned with the first capacity through the second capacity, which can avoid capacity drift caused by inconsistent capacity calculation methods.

[0008] In some embodiments, determining the second capacity of the battery according to the first capacity includes:

[0009] Determining the inflection point charge amount according to the capacity value of the battery charged from the voltage inflection point to the completion of charging;

[0010] The second capacity is determined according to the difference between the first capacity and the inflection point charge amount.

[0011] In this way, by charging the battery from a low power level to a full power level, the first capacity can be obtained while also determining the second capacity at the target inflection point, so as to calculate the battery capacity when the battery starts charging at a higher power level, thereby achieving capacity alignment between the two battery capacity calculation methods.

[0012] In certain embodiments, the inflection point charge and / or the first capacity are determined according to an ampere-hour integration method.

[0013] In this way, the inflection point charging amount and / or the first capacity can be determined according to the ampere-hour integration method to achieve the determination of the capacity charged into the battery.

[0014] In some embodiments, the determining method further comprises:

[0015] When the initial state of charge of the battery before charging is lower than the set threshold, charging the battery;

[0016] After the battery is completely charged, the first capacity is determined according to the capacity value charged into the battery and the initial state of charge.

[0017] In this way, by charging the battery when the battery state of charge is low, the charging capacity of the battery from the beginning of charging to full charge can be obtained, and the first capacity with higher accuracy can be determined according to the charging capacity and the initial state of charge.

[0018] In some embodiments, the determining method further comprises:

[0019] Determining the existence state of the voltage inflection point in the current charging process according to the voltage-capacity relationship of the battery in the current charging process;

[0020] In the case that the voltage inflection point exists in the current charging process, the second capacity of the battery is determined according to the first capacity.

[0021] In this way, it is possible to determine whether there is a voltage inflection point based on the voltage-capacity relationship of the battery during the current charging process. If it is determined that there is a voltage inflection point, the second capacity is determined based on the first capacity to achieve capacity update at the voltage inflection point.

[0022] In some embodiments, the determining method further comprises:

[0023] In the case that the voltage inflection point does not exist in the current charging process, the previous capacity is used as the second capacity, and the previous capacity is the capacity of the voltage inflection point determined before the current charging process.

[0024] In this way, in the absence of a voltage inflection point, the previous capacity is retained and used as the second capacity for subsequent calculation of the battery capacity.

[0025] In some embodiments, determining the battery capacity according to the second capacity includes:

[0026] When the state of charge of the battery before charging is greater than or equal to a set threshold, charging the battery;

[0027] In the case where the battery has the voltage inflection point, determining the capacity of the battery charged from the voltage inflection point to the completion of charging as the current charging amount;

[0028] The battery capacity is determined according to the sum of the current charging amount and the second capacity.

[0029] In this way, when the battery cannot directly perform high-precision battery capacity calculation, the battery capacity is determined by using the second capacity and the current charge amount charged into the battery from the voltage inflection point to the completion of charging, so as to realize the calculation of the battery capacity. And the capacity of the two calculation methods can be aligned to avoid capacity drift.

[0030] An embodiment of the present application provides an electronic device, which includes one or more processors and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the method in any of the above embodiments are implemented.

[0031] An embodiment of the present application provides a vehicle, which includes the electronic device as described in the above embodiment.

[0032] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the steps of the method of any of the above embodiments are implemented.

[0033] An embodiment of the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps of any of the above embodiments are implemented.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 It is one of the flowcharts of the determination method of certain embodiments of the present application;

[0037] Figure 2is a schematic diagram of a voltage-state of charge curve of certain embodiments of the present application;

[0038] Figure 3 This is the second flow chart of the determination method of certain embodiments of the present application;

[0039] Figure 4 is a schematic diagram of a voltage-capacity curve of certain embodiments of the present application;

[0040] Figure 5 is a schematic diagram of a voltage difference-capacity curve of certain embodiments of the present application;

[0041] Figure 6 This is the third flow chart of the determination method of certain embodiments of the present application;

[0042] Figure 7 This is a fourth flow chart of a determination method of certain embodiments of the present application;

[0043] Figure 8 This is the fifth flow chart of the determination method of certain embodiments of the present application. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] Battery health state (SOH) is one of the important parameters for evaluating battery performance. SOH can be tracked to determine when to terminate the battery's service life. SOH is usually defined as the ratio between the battery capacity and its initial capacity within a given time. When determining SOH, the current battery capacity needs to be determined. Based on the capacity value of the battery at the inflection point, the current battery capacity can be determined. Therefore, a method is needed to determine the capacity value of the battery at the inflection point.

[0046] Based on the above unresolved issues, please refer to Figure 1 , the embodiment of the present application provides a method for determining battery capacity, the determination method comprising:

[0047] 01: Determine a second capacity of the battery according to the first capacity, where the first capacity is the battery capacity determined based on a preset method, and the second capacity is the capacity of the battery at a voltage inflection point;

[0048] 02: Determine the battery capacity according to the second capacity.

[0049] The embodiment of the present application provides an electronic device, the electronic device includes one or more processors and a memory, the memory stores a computer program, and the computer program is executed by the processor. The processor can be used to: determine the second capacity of the battery according to the first capacity; determine the battery capacity according to the second capacity.

[0050] The present application embodiment provides a determination device, which includes a first determination module and a second determination module. The first determination module can be used to determine the second capacity of the battery according to the first capacity; the second determination module can be used to determine the battery capacity according to the second capacity.

[0051] Specifically, see Figure 2 During the battery charging and discharging process, there is a region in the voltage capacity curve where the voltage changes slowly, which is called the voltage platform region. During the transition between two different platform regions, there is a point where the voltage changes fastest, which is called the voltage inflection point. In one embodiment, Figure 2 As shown, the battery voltage includes three voltage platform areas, namely, a low platform area (L), a middle platform area (M) and a high platform area (H). In contrast, it includes two voltage inflection points, which can be divided into a low voltage inflection point and a high voltage inflection point according to the voltage level.

[0052] In the related art, there are many methods for determining battery capacity. For example, when the battery is charged from a low power level to a full power level, the battery capacity is determined based on the difference between the charged capacity and the state of charge (SOC) before and after charging. The battery capacity obtained by this method is highly accurate and is a high-precision capacity. Alternatively, the battery capacity is determined based on the inflection point capacity of the battery at the high voltage inflection point and the sum of the capacity charged from the high voltage inflection point to the full charge. This method does not require the battery to have a low SOC when it starts charging. As long as there is a voltage inflection point during the charging process, the battery capacity can be calculated.

[0053] However, as the battery is used, the battery ages and the internal resistance changes, etc., the capacity value at the voltage inflection point of the battery will change, resulting in a decrease in the accuracy of the battery capacity calculated based on the capacity value at the voltage inflection point. Furthermore, there may be a difference in the capacity calculated by the two methods, resulting in a drift between the capacities obtained by alternating between the two methods, affecting user experience and trust.

[0054] In the implementation of the present application, the second capacity is determined according to the first capacity determined based on the preset method. When determining the battery capacity according to the second capacity, two methods for calculating the battery capacity are combined, so that the battery capacity obtained according to the second capacity is also determined based on the first capacity, which improves the correlation of the battery capacities obtained by the two calculation methods, realizes capacity alignment, and avoids the capacity drift that occurs when the two calculation methods are used interchangeably to calculate the battery capacity. In addition, there is no need to introduce additional storage for recording low voltage inflection point information, which can effectively reduce memory usage and has stronger adaptability.

[0055] Among them, the battery includes a lithium ion battery, a sodium ion battery, etc. For example, the battery can be a lithium iron phosphate battery, a ternary lithium battery, a lithium cobalt oxide battery, etc. The battery capacity is the maximum capacity of the battery.

[0056] The preset algorithm is a method for determining the battery capacity using not only the high inflection point capacity and the charge capacity after the high inflection point, but also the battery capacity determined by the preset algorithm has a high accuracy. For example, the battery capacity is determined by the high-precision ampere-hour integration method as the first capacitance.

[0057] The voltage inflection point is the point in the voltage-capacity curve where the voltage changes fastest during the charge and discharge process of the battery. In one embodiment, the battery is a lithium iron phosphate battery, and the battery has two voltage inflection points. The voltage inflection point with a higher voltage is used as the target voltage inflection point. The battery capacity at the target voltage inflection point is determined based on the first capacity as the second capacity. The battery capacity is then determined based on the sum of the second capacity and the capacity charged into the battery when charging from the target voltage inflection point to full capacity.

[0058] Furthermore, the first capacity may also be a capacity with higher accuracy obtained by other methods, which is not limited here.

[0059] Thus, in the method for determining battery capacity, the electronic device, the vehicle, the computer-readable storage medium, and the computer program product, by determining the second capacity of the battery according to the first capacity, the battery inflection point capacity can be updated, thereby determining the capacity at the current battery inflection point. When the first capacity cannot be determined subsequently, the current capacity of the battery can be determined according to the second capacity. Moreover, the determined current capacity can be aligned with the first capacity through the second capacity, which can avoid capacity drift caused by inconsistent capacity calculation methods.

[0060] See also Figures 3 to 5 In some embodiments, step 01, determining a second capacity of a battery according to a first capacity, comprises:

[0061] 011: Determine the charging amount at the inflection point according to the capacity value charged from the voltage inflection point to the completion of charging;

[0062] 012: Determine the second capacity based on the difference between the first capacity and the charge amount at the inflection point.

[0063] In some embodiments, the processor may be configured to: determine the inflection point charge amount based on the capacity value of the battery charged from the voltage inflection point to the completion of charging; and determine the second capacity based on the difference between the first capacity and the inflection point charge amount.

[0064] In some embodiments, the first determination module includes a first determination submodule and a second determination submodule. The first determination submodule can be used to determine the inflection point charge amount according to the capacity value charged from the voltage inflection point to the completion of charging of the battery; the second determination submodule can be used to determine the second capacity according to the difference between the first capacity and the inflection point charge amount.

[0065] Specifically, the inflection point charge amount ΔQ1 is the capacity value charged when the battery is charged from the voltage inflection point to the completion of charging. max1 The difference between the battery capacity Q and the target inflection point can be obtained. HVTP The second capacity Q HVTP for:

[0066] Q HVTP =Q max1 -ΔQ1

[0067] Among them, the inflection point charging amount can be determined according to the ampere-hour integration method.

[0068] In this way, by charging the battery from a low power level to a full power level, the first capacity can be obtained while also determining the second capacity at the target inflection point, so as to calculate the battery capacity when the battery starts charging at a higher power level, thereby achieving capacity alignment between the two battery capacity calculation methods.

[0069] In certain embodiments, the inflection point charge and / or the first capacity are determined based on an ampere-hour integration method.

[0070] Specifically, the ampere-hour integration method is a method for obtaining the charging capacity based on the charging time and the charging current. That is, the inflection point charging amount is determined according to the ampere-hour integration method, or the first capacity is determined according to the ampere-hour integration method. Or both the inflection point charging amount and the first capacity are determined according to the ampere-hour integration method.

[0071] When determining the inflection point charge amount, the timing is started when the voltage inflection point is detected, and the timing is stopped when the battery is fully charged to obtain the inflection point charge time. The capacity charged into the battery can be determined based on the inflection point charge time and the charging current when the battery is charged to obtain the inflection point charge amount.

[0072] When determining the first capacity, timing is started when charging starts and stopped when the battery is fully charged to obtain the battery charging time. According to the battery charging time and the charging current when the battery is charged, the capacity charged into the battery can be determined to obtain the first capacity.

[0073] In this way, the inflection point charging amount and / or the first capacity can be determined according to the ampere-hour integration method to achieve the determination of the capacity charged into the battery.

[0074] See also Figure 6 In some embodiments, the determination method further comprises:

[0075] 03: Charge the battery when the initial state of charge before charging is lower than the set threshold;

[0076] 04: After the battery is fully charged, the first capacity is determined according to the capacity value charged into the battery and the initial state of charge.

[0077] In some embodiments, the processor may be configured to: charge the battery when the state of charge of the battery before charging is lower than a set threshold; and determine the capacity value charged into the battery as the first capacity after the battery is completely charged.

[0078] In some embodiments, the determination device includes a first charging module and a third determination module. The first charging module can be used to charge the battery when the state of charge of the battery before charging is lower than a set threshold; the third determination module can be used to determine the capacity value charged into the battery as the first capacity after the battery is fully charged.

[0079] Specifically, according to the ampere-hour integration method, when the state of charge of the battery before charging begins is lower than a set threshold, the battery is charged to full capacity, and a battery capacity with higher accuracy can be obtained as the first capacity.

[0080] Among them, the set threshold is a pre-set state of charge value, which can be set according to actual needs and is not limited here. For example, the set threshold can be 16%, 18%, 19%, 20%, 22, 23%, 24%. When the state of charge of the battery is lower than the set threshold, the battery capacity is low at this time, and charging it to full charge can obtain the first capacity. In some embodiments, the set threshold is lower than the state of charge corresponding to the capacity of the low voltage inflection point of the battery.

[0081] Furthermore, before charging begins, the battery's state of charge is an initial state of charge SOC1. After charging is completed, the battery's capacity is fully charged, and the battery's state of charge at this time is a maximum state of charge SOC1. max =100%.

[0082] By counting the battery capacity value ΔQ from the beginning of charging to the completion of charging HVP1 , initial state of charge SOC1, maximum state of charge SOC max , the first capacity Q of the battery can be determined max1 :

[0083]

[0084] Because the state of charge of the battery is low before charging begins, the charged capacity is closer to the battery capacity, and therefore the accuracy of the first capacity is higher.

[0085] Since the accuracy of the first capacity determined by this method is based on the size of ΔSOC and the accuracy of SOC, the larger the ΔSOC is, the higher the accuracy of the first capacity is. Alternatively, when the low voltage inflection point is located in a slope area with greater recognition in the low platform area, the accuracy of the first capacity is higher. Furthermore, the accuracy of the determined second capacity is also higher.

[0086] In this way, by charging the battery when the battery state of charge is low, the charging capacity of the battery from the beginning of charging to full charge can be obtained, and the first capacity with higher accuracy can be determined according to the charging capacity and the initial state of charge.

[0087] See also Figure 7 In some embodiments, the determination method further comprises:

[0088] 05: According to the voltage-capacity relationship of the battery during the current charging process, determine the existence state of the voltage inflection point of the current charging process;

[0089] 06: When there is a voltage inflection point in the current charging process, determine the second capacity of the battery according to the first capacity.

[0090] In some embodiments, the processor may be used to: determine the existence of a voltage inflection point in the current charging process based on a voltage-capacity relationship of the battery in the current charging process; and determine the second capacity of the battery based on the first capacity when a voltage inflection point exists in the current charging process.

[0091] In some embodiments, the determination device further includes a fourth determination module and a fifth determination module. The fourth determination module can be used to determine the existence state of the voltage inflection point of the current charging process according to the voltage-capacity relationship of the battery in the current charging process; the fifth determination module can be used to determine the second capacity of the battery according to the first capacity when the voltage inflection point exists in the current charging process.

[0092] Specifically, the processor can determine the position of the voltage inflection point in real time during the charging process according to the slope of the voltage-capacity curve. For example, the voltage is differentiated to obtain a voltage differential-capacity curve (such as Figure 5 The peak position in the curve is the voltage inflection point. For the same battery cell, the power Q corresponding to the high and low inflection points over a period of time HVTP , Q LVTP are all certain, so the inflection point power value Q HVTP , Q LVTP It is a constant term for a short period of time when no abnormality occurs. If leakage occurs in individual cells, it may cause changes in the inflection point capacity. When replacing cells or when abnormalities or aging occur in the cells, we can dynamically update the inflection point capacity through real-time learning of the inflection point, and use the capacity value Q of the high inflection point to dynamically update the inflection point capacity. HVTP The capacity value from the inflection point to full charge is Q HVP To calculate, that is, Q max2 =Q HVTP +Q HVP .

[0093] The implementation method of the present application dynamically updates the inflection point capacity according to the first capacity. When it is determined that there is a voltage inflection point, the second capacity of the battery is determined according to the first capacity. It should be noted that the battery may have multiple voltage inflection points, and a voltage inflection point with a higher voltage can be selected as the target voltage inflection point to determine the second capacity.

[0094] In one embodiment, the battery starts charging when the SOC is 10%. During the charging process, the processor determines in real time whether a voltage inflection point occurs. After determining that a voltage inflection point with a larger voltage occurs, the timing starts. After the battery is fully charged, the timing ends and the battery charging time is obtained. According to the battery charging time and the charging current, the inflection point charge amount of the battery can be determined. According to the difference between the first capacity and the inflection point charge amount, the second capacity can be determined. After determining the second capacity, the battery capacity can be further measured.

[0095] In this way, it is possible to determine whether there is a voltage inflection point based on the voltage-capacity relationship of the battery during the current charging process. If it is determined that there is a voltage inflection point, the second capacity is determined based on the first capacity to achieve capacity update at the voltage inflection point.

[0096] See also Figure 7 In some embodiments, the determination method further comprises:

[0097] 07: When there is no voltage inflection point in the current charging process, the previous capacity is used as the second capacity, and the previous capacity is the capacity of the voltage inflection point determined before the current charging process.

[0098] In some embodiments, the processor may be configured to use the previous capacity as the second capacity when there is no voltage inflection point in the current charging process.

[0099] Specifically, in the case of fast charging, there is no voltage inflection point during the charging process of the battery. Therefore, even if the first capacity is obtained, the capacity value of the voltage inflection point cannot be updated. Therefore, the previously saved capacity at the previous voltage inflection point is retained as the second capacity.

[0100] In addition, initially, the capacity value of the voltage inflection point is preset based on experience or time delay data to determine the battery capacity.

[0101] In this way, in the absence of a voltage inflection point, the previous capacity is retained and used as the second capacity for subsequent calculation of the battery capacity.

[0102] In some embodiments, the determining device further includes a sixth determining module. The sixth determining module can be used to use the previous capacity as the second capacity when there is no voltage inflection point in the current charging process.

[0103] See also Figure 8 In some embodiments, step 02, determining the battery capacity according to the second capacity, includes:

[0104] 021: When the state of charge of the battery before charging is greater than or equal to the set threshold, charge the battery;

[0105] 022: When the battery has a voltage inflection point, determine the capacity of the battery charged from the voltage inflection point to the completion of charging, as the current charging amount;

[0106] 023: Determine the battery capacity according to the sum of the current charge amount and the second capacity.

[0107] In certain embodiments, the processor may be used to charge the battery when the state of charge of the battery before charging is greater than or equal to a set threshold; and to determine the capacity of the battery charged from a voltage inflection point to completion of charging as the current charge amount; and to determine the battery capacity based on the sum of the current charge amount and the second capacity.

[0108] In some embodiments, the second determination module includes a charging submodule, a third determination submodule, and a fourth determination submodule. The charging submodule can be used to charge the battery when the state of charge of the battery before charging is greater than or equal to a set threshold; the third determination submodule can be used to determine the capacity of the battery charged from the voltage inflection point to the completion of charging as the current charge amount; the fourth determination submodule can be used to determine the battery capacity according to the sum of the current charge amount and the second capacity.

[0109] Specifically, when the state of charge of the battery before charging is greater than or equal to the set threshold, if the capacity of the battery is determined based on the charging capacity value from the beginning of charging to full charging and the state of charge at the beginning of charging, the determined capacity will not be accurate enough. Therefore, it is necessary to determine the capacity of the battery based on the inflection point capacity of the battery voltage inflection point.

[0110] Therefore, when the state of charge of the battery before charging is greater than or equal to the set threshold, the battery is charged, and the voltage inflection point is continuously detected during the charging process. When it is determined that there is a voltage inflection point, the capacity value charged into the battery is recorded from the voltage inflection point until the battery is fully charged. The capacity charged into the battery from the voltage inflection point to the completion of charging is taken as the current charge amount ΔQ HVP2 Furthermore, the capacity charged from the voltage inflection point to the completion of charging can be calculated according to the charging time and the charging current using the ampere-hour integration method.

[0111] According to the current charge amount ΔQ HVP2 With the second capacity Q determined previously HVTP The sum of the battery capacity Q can be determined max2 That is, the battery capacity is:

[0112] Q max2 =Q HVTP +ΔQ HVP2

[0113] Among them, the second capacity Q HVTP It can be determined based on the first capacity, or it can be a previously preset voltage value at the voltage inflection point. It should be noted that, when the first capacity is determined, the capacity value at the voltage inflection point can be updated to achieve dynamic update and adjustment of the second capacity.

[0114] In this way, when the battery cannot directly perform high-precision battery capacity calculation, the battery capacity is determined by using the second capacity and the current charge amount charged into the battery from the voltage inflection point to the completion of charging, so as to realize the calculation of the battery capacity. And the capacity of the two calculation methods can be aligned to avoid capacity drift.

[0115] An embodiment of the present application provides a vehicle, and the vehicle includes the electronic device as described in the above embodiment.

[0116] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the method of any of the above embodiments are implemented.

[0117] An embodiment of the present application provides a computer program product, including a computer program, which implements the steps of any of the above embodiments when the computer program is executed by a processor.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0119] In addition, the term "connection" should be understood in a broad sense, for example, it can include fixed connection, detachable connection, or integral connection; it can include direct connection, indirect connection through an intermediate medium, and internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0120] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0121] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0122] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for determining battery capacity, characterized in that: The determination method comprises: Determine a second capacity of the battery according to the first capacity, wherein the first capacity is a battery capacity determined based on a preset method, and the second capacity is a capacity of the battery at a voltage inflection point; The battery capacity is determined according to the second capacity.

2. The determination method according to claim 1, characterized in that: The determining the second capacity of the battery according to the first capacity includes: Determining the inflection point charge amount according to the capacity value charged from the voltage inflection point to the completion of charging of the battery; The second capacity is determined according to the difference between the first capacity and the inflection point charge amount.

3. The determination method according to claim 2, characterized in that: The inflection point charge amount and / or the first capacity are determined according to the ampere-hour integration method.

4. The determination method according to claim 1, characterized in that: The determination method further comprises: When the initial state of charge of the battery before charging is lower than a set threshold, charging the battery; After the battery is completely charged, the first capacity is determined according to the capacity value charged into the battery and the initial state of charge.

5. The determination method according to claim 1, characterized in that: The determination method further comprises: Determining the existence state of the voltage inflection point in the current charging process according to the voltage-capacity relationship of the battery in the current charging process; In the case that the voltage inflection point exists in the current charging process, the second capacity of the battery is determined according to the first capacity.

6. The determination method according to claim 5, characterized in that: The determination method further comprises: In the case that the voltage inflection point does not exist in the current charging process, the previous capacity is used as the second capacity, and the previous capacity is the capacity of the voltage inflection point determined before the current charging process.

7. The determination method according to claim 1, characterized in that: The determining the battery capacity according to the second capacity includes: When the state of charge of the battery before charging is greater than or equal to a set threshold, charging the battery; In the case where the battery has the voltage inflection point, determining the capacity of the battery charged from the voltage inflection point to the completion of charging as the current charging amount; The battery capacity is determined according to the sum of the current charging amount and the second capacity.

8. An electronic device, characterized in that: The electronic device includes one or more processors and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 7 are implemented.

9. A vehicle, characterized in that: The vehicle includes the electronic device as claimed in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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