SOC determination method, device, vehicle, storage medium and program product

Abstract

The present application relates to a SOC determination method, device, vehicle, storage medium and program product, and relates to the field of battery management technology. The method is applied to a vehicle, and includes: obtaining the voltage of the target battery of the vehicle at the current moment; determining the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment; the target rule is established based on the mapping relationship between the voltage of the target battery and the battery capacity of the target battery; determining the SOC of the target battery according to the battery capacity at the current moment and the preset rated capacity. In this way, the technical problem of large error in the calculated SOC in the related art can be avoided.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, in particular to the field of new energy vehicle battery management technology, and specifically to a SOC determination method, device, vehicle, storage medium and program product. Background Art

[0002] The state of charge (SOC) of a battery is one of the important parameters in a battery management system. In order to ensure the normal use of the battery, it is often necessary to accurately calculate the SOC of the battery.

[0003] However, the related technology usually adopts the method of ampere-hour integration to calculate the SOC of the battery. In this method, when the battery is not fully charged, the calculation result will have errors, and when the battery is not fully charged for multiple times, the errors will accumulate, resulting in larger errors. Summary of the invention

[0004] The present application provides a SOC determination method, device, vehicle, storage medium and program product to at least solve the technical problem of large SOC error in the calculation of the related art. The technical solution of the present application is as follows:

[0005] According to the first aspect involved in the present application, a SOC determination method is provided, including: obtaining the voltage of a target battery of a vehicle at a current moment; determining the battery capacity of the target battery at a current moment according to a target rule and the voltage at a current moment; the target rule is related to the polar diameter and polar angle of a target polar coordinate system; the target polar coordinate system is established based on a target curve; the target curve is used to characterize the mapping relationship between a sample voltage of the target battery and a sample battery capacity of the target battery; the polar diameter is used to characterize the distance between the pole of the target polar coordinate and the coordinate point on the target curve; the polar angle is used to characterize the angle between the polar axis and the polar diameter of the target polar coordinate; and determining the SOC of the target battery according to the battery capacity at a current moment and a preset rated capacity.

[0006] According to the above technical means, a target rule can be constructed to efficiently and accurately determine the battery capacity of the target battery according to the target rule and the voltage at the current moment, thereby determining the current SOC of the battery according to the battery capacity. This avoids the problem of large errors that are easily caused by the related art using ampere-hour integration to calculate the SOC of the battery. Therefore, the present application can accurately determine the SOC of the battery.

[0007] In one possible manner, the target rule includes a first preset relationship, a second preset relationship and a third preset relationship; the first preset relationship includes a first functional relationship and a first corresponding relationship; the first functional relationship is used to characterize the functional relationship between the polar diameter and the polar angle; the first corresponding relationship includes the polar angles corresponding to multiple polar diameters; the second preset relationship is used to characterize the relationship between the polar diameter, the polar angle, the voltage at the current moment and the cut-off voltage; the third preset relationship is used to characterize the relationship between the polar diameter, the polar angle and the battery capacity.

[0008] In one possible manner, the second preset relationship satisfies the first formula, which is:

[0009] V 1 =V 2 +rsinθ

[0010] Among them, r is used to represent the polar diameter, θ is used to represent the polar angle, and V 1 Used to indicate the voltage at the current moment, V 2 It is used to represent the cut-off voltage; the second preset relationship satisfies the second formula, and the second formula is:

[0011] Q=rcosθ

[0012] Among them, r is used to represent the polar diameter, θ is used to represent the polar angle, and Q is used to represent the battery capacity.

[0013] In one possible method, the battery capacity of the target battery at a current moment is determined according to the target rule and the voltage at a current moment, including: determining the target polar diameter and the target polar angle according to the first functional relationship, the first formula and the voltage at a current moment; determining the battery capacity at a current moment according to the target polar diameter, the target polar angle and the second formula.

[0014] According to the above technical means, a functional relationship between the polar coordinate polar angle and the polar diameter can be constructed according to the discharge curve or charging curve corresponding to the target battery, so that the SOC of the target battery can be determined efficiently and accurately according to the functional relationship.

[0015] In one possible method, the battery capacity of the target battery at the current moment is determined according to the target rule and the voltage at the current moment, including: determining the target polar diameter and the target polar angle according to the first corresponding relationship, the first formula and the voltage at the current moment; the target polar diameter, the target polar angle and the voltage at the current moment satisfy the first formula; and determining the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula.

[0016] According to the above technical means, a first mapping relationship can be established based on a large amount of data, so that when determining the SOC of the target battery, the polar diameter and polar angle can be determined efficiently and accurately, so that the SOC of the target battery can be determined efficiently and accurately.

[0017] In one possible manner, the cut-off voltage corresponding to the target battery when being charged is the voltage when the target battery is fully discharged, and the cut-off voltage corresponding to the target battery when being discharged is the voltage when the target battery is fully charged.

[0018] According to the above technical means, different operating conditions of the battery can be considered, polar coordinates corresponding to different operating conditions can be constructed, and the accuracy of the polar coordinates can be guaranteed, so that the SOC of the battery can be accurately determined.

[0019] In one possible approach, the current ambient temperature and the current current of the target battery are obtained; a target rule corresponding to the current ambient temperature and the current current is determined from a plurality of preset rules; the preset rule is related to the polar diameter and polar angle at a preset current and a preset ambient temperature.

[0020] According to the above technical means, the mapping relationship between the voltage of the target battery and the battery capacity of the target battery under different currents and ambient temperatures can be considered, thereby supporting the subsequent accurate determination of the SOC of the target battery.

[0021] According to a second aspect provided by the present application, there is provided an SOC determination device, including an acquisition unit and a determination unit.

[0022] An acquisition unit is used to acquire the voltage of the target battery of the vehicle at a current moment; a determination unit is used to determine the battery capacity of the target battery at a current moment according to a target rule and the voltage at a current moment; the target rule is related to the polar diameter and polar angle of the target polar coordinate system; the target polar coordinate system is established based on a target curve; the target curve is used to characterize the mapping relationship between the sample voltage of the target battery and the sample battery capacity of the target battery; the polar diameter is used to characterize the distance between the pole of the target polar coordinate and the coordinate point on the target curve; the polar angle is used to characterize the angle between the polar axis and the polar diameter of the target polar coordinate; the determination unit is also used to determine the SOC of the target battery according to the battery capacity at a current moment and a preset rated capacity.

[0023] In one possible manner, the determination unit is specifically used to: determine the target polar diameter and the target polar angle according to the first functional relationship, the first formula and the voltage at the current moment; determine the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula.

[0024] In one possible manner, the determination unit is specifically used to: determine the target polar diameter and target polar angle based on a first corresponding relationship, a first formula and the voltage at the current moment; the target polar diameter, target polar angle and the voltage at the current moment satisfy the first formula; determine the battery capacity at the current moment based on the target polar diameter, target polar angle and the second formula.

[0025] In one possible manner, the acquisition unit is also used to obtain the current ambient temperature and the current current of the target battery; the determination unit is also used to determine the target rule corresponding to the current ambient temperature and the current current from multiple preset rules; the preset rule is related to the polar diameter and polar angle under the preset current and preset ambient temperature.

[0026] According to the third aspect provided by the present application, a vehicle is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0027] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by the processor of the vehicle, the vehicle is enabled to execute the method in the above-mentioned first aspect and any possible implementation method thereof.

[0028] According to the fifth aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, and when the computer instructions are executed on a vehicle, the vehicle executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0029] Therefore, the above technical features of the present application have the following beneficial effects:

[0030] (1) A target rule can be constructed to efficiently and accurately determine the battery capacity of the target battery based on the target rule and the voltage at the current moment, thereby determining the current SOC of the battery based on the battery capacity. This avoids the problem of large errors that are easily caused by the use of ampere-hour integration to calculate the SOC of the battery in the related art. Therefore, the present application can accurately determine the SOC of the battery.

[0031] (2) A functional relationship between the polar angle and the polar diameter of the polar coordinates can be constructed according to the discharge curve or the charging curve corresponding to the target battery, so that the SOC of the target battery can be determined efficiently and accurately according to the functional relationship.

[0032] (3) A first mapping relationship can be established based on a large amount of data, so that when determining the SOC of the target battery, the polar radius and polar angle can be determined efficiently and accurately, so that the SOC of the target battery can be determined efficiently and accurately.

[0033] (4) It can consider different working conditions of the battery, construct polar coordinates corresponding to different working conditions, ensure the accuracy of the polar coordinates, and thus accurately determine the SOC of the battery.

[0034] (5) It is possible to consider the mapping relationship between the voltage of the target battery and the battery capacity of the target battery under different currents and ambient temperatures, thereby supporting the subsequent accurate determination of the SOC of the target battery.

[0035] It should be noted that the technical effects brought about by any implementation method in the second to fifth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0038] Figure 1 is a flow chart showing a method for determining SOC according to an exemplary embodiment;

[0039] Figure 2 is a schematic diagram of a target curve of a target battery under discharge conditions according to an exemplary embodiment;

[0040] Figure 3 is a schematic diagram showing target polar coordinates of a target battery in a discharge condition according to an exemplary embodiment;

[0041] Figure 4 is a flow chart showing another SOC determination method according to an exemplary embodiment;

[0042] Figure 5 is a schematic diagram showing a mapping relationship between a polar angle and a polar diameter according to an exemplary embodiment;

[0043] Figure 6 is a flow chart showing another SOC determination method according to an exemplary embodiment;

[0044] Figure 7 is a flow chart showing another SOC determination method according to an exemplary embodiment;

[0045] Figure 8 is a schematic diagram showing a SOC determination process according to an exemplary embodiment;

[0046] Fig. 9 is a charging curve diagram of a target battery according to an exemplary embodiment;

[0047] Fig.10 is a discharge curve diagram of a target battery according to an exemplary embodiment;

[0048] Fig.11is a block diagram of a SOC determination device according to an exemplary embodiment;

[0049] Fig.12 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0050] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0052] For ease of understanding, the SOC determination method provided in the present application is specifically introduced below with reference to the accompanying drawings.

[0053] Figure 1 is a flow chart of a method for determining SOC according to an exemplary embodiment. Figure 1 As shown, the SOC determination method includes the following steps:

[0054] S101. The SOC determination device obtains the current voltage of a target battery of a vehicle.

[0055] Optionally, the target battery can be set according to actual needs. For example, the target battery can be a storage battery of the vehicle or a power battery of the vehicle.

[0056] Exemplarily, when the target battery is a power battery of a vehicle, the voltage range of the target battery is 2.0 volts to 3.65 volts.

[0057] In one possible manner, the SOC determination device may be configured with a data acquisition device. The SOC determination device may send a collection message for collecting the voltage of the target battery at the current moment to the data acquisition device. The data acquisition device may respond to the collection message, collect and send the voltage of the target battery at the current moment to the SOC determination device. The SOC determination device may receive the voltage of the target battery at the current moment sent by the data acquisition device.

[0058] Exemplarily, the data acquisition device may collect that the voltage of the target battery at the current moment is 2.5 volts.

[0059] S102 . The SOC determination device determines the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment.

[0060] Among them, the target rule can be related to the polar diameter and polar angle of the target polar coordinate system. The target polar coordinate system is established based on the target curve. The target curve is used to characterize the mapping relationship between the sample voltage of the target battery and the sample battery capacity of the target battery. The polar diameter can be used to characterize the distance between the pole of the target polar coordinate and the coordinate point on the target curve. The polar angle can be used to characterize the angle between the polar axis and the polar diameter of the target polar coordinate.

[0061] In one possible manner, the target rule may include a first preset relationship, a second preset relationship, and a third preset relationship. The first preset relationship may include a first functional relationship and a first corresponding relationship. The first functional relationship may be used to characterize the functional relationship between the polar diameter and the polar angle. The first corresponding relationship may include polar angles corresponding to multiple polar diameters. The second preset relationship may be used to characterize the relationship between the polar diameter, the polar angle, the voltage at the current moment, and the cut-off voltage. The third preset relationship may be used to characterize the relationship between the polar diameter, the polar angle, and the battery capacity.

[0062] In one possible manner, the pole can be used to represent the angle between the polar axis and the polar diameter of the target polar coordinates. The polar axis of the target polar coordinates is the horizontal line corresponding to the cut-off voltage of the target battery.

[0063] Optionally, the target curve can be set according to actual needs. For example, the target curve can be a change curve between the voltage of the target battery and the battery capacity of the target battery when the target battery is discharged. The target curve can also be a change curve between the voltage of the target battery and the battery capacity of the target battery when the target battery is charged.

[0064] In one possible manner, the cut-off voltage corresponding to the target battery when being charged is the voltage when the target battery is fully discharged, and the cut-off voltage corresponding to the target battery when being discharged is the voltage when the target battery is fully charged.

[0065] Based on this, the present application can take into account different operating conditions of the battery, construct polar coordinates corresponding to different operating conditions, ensure the accuracy of the polar coordinates, and thus accurately determine the SOC of the battery.

[0066] For example, Figure 2 The figure shows a schematic diagram of a target curve of a target battery under discharge conditions. Figure 2 In the embodiment, the voltage varies as the battery capacity of the target battery varies.

[0067] For example, in combination Figure 2 ,like Figure 3, which is a schematic diagram of target polar coordinates of a target battery under discharge conditions. Figure 3 In the figure, the polar radius r can be used to represent the distance between the pole of the target polar coordinates and the coordinate point on the target curve. The polar angle θ can be used to represent the angle between the polar axis and the polar radius of the target polar coordinates. The pole 0 can be used to represent the angle between the polar axis and the polar radius of the target polar coordinates. The polar axis L of the target polar coordinates is the horizontal line corresponding to the cut-off voltage of the target battery.

[0068] In one possible manner, the second preset relationship may satisfy the first formula, which is:

[0069] V 1 =V 2 +rsinθ.

[0070] Among them, r can be used to represent the polar diameter, θ can be used to represent the polar angle, and V 1 Can be used to represent the voltage at the current moment, V 2 Can be used to indicate cut-off voltage;

[0071] The second preset relationship satisfies the second formula, which is:

[0072] Q=rcosθ, where r can be used to represent the polar diameter, θ can be used to represent the polar angle, and Q can be used to represent the battery capacity.

[0073] In a possible manner, the first formula and the second formula may be used to characterize polar coordinate equations corresponding to the target polar coordinates.

[0074] In one possible manner, the SOC determination device can determine the target polar diameter and the target polar angle according to the first functional relationship, the first formula and the voltage at the current moment. The SOC determination device can determine the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula. The specific implementation method of the SOC determination device determining the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment can be referred to the following S201-S202.

[0075] In one possible manner, the SOC determination device may determine the target polar diameter and the target polar angle according to the first corresponding relationship, the first formula, and the voltage at the current moment. The SOC determination device may determine the battery capacity at the current moment according to the target polar diameter, the target polar angle, and the second formula. The specific implementation method of the SOC determination device determining the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment may refer to S301-S302 below.

[0076] S103 . The SOC determination device determines the SOC of the target battery according to the current battery capacity and the preset rated capacity.

[0077] In one possible manner, the preset rated capacity can be used to characterize the maximum battery capacity of the target battery, or can be used to characterize the battery capacity marked by the manufacturer when the target battery leaves the factory. This application does not impose specific restrictions on this. The preset rated capacity can also be called the nominal capacity.

[0078] It can be understood that the SOC can be used to represent the ratio between the remaining battery capacity of the battery and the rated battery capacity.

[0079] In one possible manner, the SOC determination device may determine the ratio between the battery capacity at the current moment and the preset rated capacity as the SOC of the target battery.

[0080] Based on the above technical solution, the SOC determination device provided in the present application can obtain the voltage of the target battery of the vehicle at the current moment, and determine the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment, so as to further determine the SOC of the target battery according to the battery capacity at the current moment and the preset rated capacity.

[0081] Based on this, the present application can construct a target rule to efficiently and accurately determine the battery capacity of the target battery according to the target rule and the voltage at the current moment, thereby determining the current SOC of the battery according to the battery capacity. This avoids the problem of large errors that are easily caused by the related art using ampere-hour integration to calculate the SOC of the battery. Therefore, the present application can accurately determine the SOC of the battery.

[0082] In one embodiment, combining Figure 1 ,like Figure 4 As shown, when determining the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment, the SOC determination method provided in the embodiment of the present application also includes the following steps: S201-S202.

[0083] S201. The SOC determination device determines a target polar diameter and a target polar angle according to a first functional relationship, a first formula and a voltage at a current moment.

[0084] Optionally, the first functional relationship may be determined according to a mapping relationship between the polar angle and the polar diameter.

[0085] In one possible manner, the first preset relationship may include multiple first functional relationships. That is, the SOC determination device may determine multiple first functional relationships based on the preset relationship between the polar angle and the polar diameter. The SOC determination device may determine a target first functional relationship corresponding to the voltage at the current moment from the multiple first functional relationships. The SOC determination device may determine the target polar diameter and the target polar angle based on the target first functional relationship, the first formula, and the voltage at the current moment.

[0086] For example, Figure 5As shown, it is a schematic diagram of a mapping relationship between a polar angle and a polar diameter provided by the present application. Among them, the SOC determination device can divide the preset mapping relationship between the polar angle and the polar diameter into interval 1, interval 2 and interval 3. Interval 1 is that the polar angle θ is greater than or equal to 0 and less than 0.6. Interval 2 is that the polar angle θ is greater than or equal to 0.6 and less than 1.54. Interval 3 is that the polar angle is greater than or equal to 1.54 and less than or equal to 1.571.

[0087] The first functional relationship corresponding to interval 1 can be the third formula:

[0088] r=aθ 2 +b.

[0089] Among them, r can be used to represent the polar axis. θ can be used to represent the polar angle. a and b can be used to represent the constants to be determined.

[0090] The first functional relationship corresponding to interval 2 can be the fourth formula:

[0091]

[0092] Among them, r can be used to represent the polar axis. θ can be used to represent the polar angle. a, b, and c can be used to represent the constants to be determined.

[0093] The first functional relationship corresponding to interval 3 can be the fifth formula:

[0094] r = a 1 +a 2 θ+a 3 θ 2 +….

[0095] Where r can be used to represent the polar axis. θ can be used to represent the polar angle. 1 、a 2 and a 3 Can be used to represent undetermined constants.

[0096] In a possible manner, the SOC determination device may determine, from a plurality of intervals, an interval corresponding to the voltage at the current moment, thereby determining the target first functional relationship.

[0097] In a possible manner, the SOC determination device may input the target first functional relationship into the first formula to obtain a second functional relationship. The second functional relationship is used to characterize the functional relationship between the voltage at the current moment, the cut-off voltage, and the polar angle.

[0098] For example, in combination Figure 5, the SOC determination device can determine interval 1 as the interval corresponding to the target battery, so that the first functional relationship corresponding to interval 1 can be determined as the target first functional relationship. The SOC determination device can input the target first functional relationship into the first formula to obtain a second functional relationship, and the second functional relationship satisfies the following sixth formula:

[0099] V 1 -V 2 =(aθ 2 +b)sinθ.

[0100] Among them, V 1 Can be used to indicate the voltage at the current moment. V 2 can be used to represent the cut-off voltage. θ can be used to represent the polar angle. a and b can be used to represent the constants to be determined.

[0101] S202. The SOC determination device determines the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula.

[0102] In one possible manner, the SOC determination device may input the target polar diameter and target polar angle determined in S201 into a second formula to calculate the battery capacity at the current moment.

[0103] For example, when the voltage at the current moment is the voltage of the target battery when it is charged, the target electrode diameter r determined by the SOC determination device is 1 is 0.4087, the target polar angle θ 1 The SOC determination device can be used to determine the target diameter r 1 and the target polar angle θ 1 Input into the second formula to calculate the battery capacity at the current moment, and obtain that the battery capacity at the current moment is 19.56 ampere hours (Ah).

[0104] Alternatively, when the voltage at the current moment is the target battery discharge voltage, the target electrode diameter r determined by the SOC determination device is 2 is 0.8132, the target polar angle θ 2 The SOC determination device can be used to determine the target diameter r 2 and the target polar angle θ 2 Input into the second formula to calculate the battery capacity at the current moment, and obtain that the battery capacity at the current moment is 82.83Ah.

[0105] Based on this, the present application can construct a functional relationship between the polar coordinate polar angle and the polar diameter according to the discharge curve or charging curve corresponding to the target battery, so as to efficiently and accurately determine the SOC of the target battery according to the functional relationship.

[0106] In one embodiment, combining Figure 1 ,like Figure 6 As shown, when determining the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment, the SOC determination method provided in the embodiment of the present application also includes the following steps: S301-S302.

[0107] S301, determining a target polar diameter and a target polar angle according to a first corresponding relationship, a first formula and a voltage at a current moment.

[0108] Among them, the target pole diameter, the target pole angle and the voltage at the current moment satisfy the first formula.

[0109] In one possible manner, the SOC determination device may determine the target polar diameter and target polar angle that can satisfy the first formula from a first corresponding relationship based on the first formula and the voltage at the current moment.

[0110] Exemplarily, as shown in Table 1, Table 1 shows a part of the first corresponding relationship of the target battery under the discharge condition.

[0111] Table 1

[0112]

[0113] Among them, 0.1C is used to indicate discharge at a rate of 10% of the rated capacity of the battery. 0.2C is used to indicate discharge at a rate of 20% of the rated capacity of the battery. 0.3C is used to indicate discharge at a rate of 30% of the rated capacity of the battery. 0.5C is used to indicate discharge at a rate of 50% of the rated capacity of the battery. 1C is used to indicate discharge at a rate of 100% of the rated capacity of the battery. 1.5C is used to indicate discharge at a rate of 150% of the rated capacity of the battery. 2C is used to indicate discharge at a rate of 200% of the rated capacity of the battery.

[0114] As shown in Table 2, Table 2 shows a first corresponding relationship of the target battery under charging condition.

[0115] Table 2

[0116]

[0117] Among them, 0.1C is used to indicate charging at a rate of 10% of the rated capacity of the battery. 0.2C is used to indicate charging at a rate of 20% of the rated capacity of the battery. 0.3C is used to indicate charging at a rate of 30% of the rated capacity of the battery. 0.5C is used to indicate charging at a rate of 50% of the rated capacity of the battery. 1C is used to indicate charging at a rate of 100% of the rated capacity of the battery. 1.5C is used to indicate charging at a rate of 150% of the rated capacity of the battery. 2C is used to indicate charging at a rate of 200% of the rated capacity of the battery.

[0118] In a possible manner, the SOC determination device may determine the voltage target polar angle and target polar axis at the current moment from the first corresponding relationship.

[0119] For example, when the voltage at the current moment is the voltage of the target battery when it is charged, the SOC determination device can determine the target pole diameter r according to the voltage at the current moment and the first corresponding relationship. 1 is 0.4087, the target polar angle θ 1 It is -0.9959.

[0120] Alternatively, when the voltage at the current moment is the voltage of the target battery when it is discharged, the SOC determination device can determine the target pole diameter r according to the voltage at the current moment and the first corresponding relationship. 2 is 0.8132, the target polar angle θ 2 It is 1.4985.

[0121] S302. The SOC determination device determines the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula.

[0122] In a possible manner, the SOC determination device determines the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula, which can be referred to in the above S202 and will not be described in detail here.

[0123] Based on this, the present application can establish a first mapping relationship based on a large amount of data, so that when determining the SOC of the target battery, the polar diameter and polar angle can be determined efficiently and accurately, so that the SOC of the target battery can be determined efficiently and accurately.

[0124] In one embodiment, Figure 7 As shown, the SOC determination method provided in the embodiment of the present application also includes the following steps: S401-S402.

[0125] S401 . The SOC determination device obtains the current ambient temperature and the current current of the target battery.

[0126] In one possible manner, the SOC determination device may send an acquisition instruction to the data acquisition device to acquire the current ambient temperature and current current of the target battery when it is working. The data acquisition device may respond to the acquisition instruction and acquire and send the current ambient temperature and current current of the target battery when it is working to the SOC determination device. The SOC determination device may receive the current ambient temperature and current current of the target battery when it is working sent by the data acquisition device.

[0127] In a possible manner, the data acquisition device may include a temperature measuring device, which may be used to measure the current ambient temperature.

[0128] S402 : The SOC determination device determines a target rule corresponding to the current ambient temperature and the current current from a plurality of preset rules.

[0129] The preset rule may be related to the polar diameter and polar angle under the preset current and the preset ambient temperature.

[0130] In one possible manner, the mapping relationship between the voltage of the target battery and the battery capacity of the target battery is different under different preset currents and preset ambient temperatures. The SOC determination device can determine the target rule from a plurality of preset rules according to the acquired current ambient temperature and current current.

[0131] Based on this, the present application can consider the mapping relationship between the voltage of the target battery and the battery capacity of the target battery under different currents and ambient temperatures, thereby being able to support the subsequent accurate determination of the SOC of the target battery.

[0132] In one embodiment, Figure 8 As shown, it is a schematic diagram of a SOC determination process provided by the present application.

[0133] The SOC determination device can establish a polar coordinate system according to the target curve. The SOC determination device can construct a mapping relationship between the polar angle and the polar diameter. The SOC determination device can calculate the SOC of the target battery according to the mapping relationship between the polar angle and the polar diameter.

[0134] Embodiment 1:

[0135] In one possible manner, the SOC determination device can obtain the charging curve of the target battery (for example, the charging curve of the LEP battery when charged at 0.1C at room temperature) and the charging cut-off voltage (for example, 3.65 volts). The SOC determines that the horizontal straight line where the charging cut-off voltage is located is determined as the polar axis of the polar coordinates. The SOC determination device determines the point on the polar axis corresponding to the complete discharge of the battery as the pole. The SOC determination device can determine the distance from the voltage value collected during the charging process to the pole as the polar diameter. The SOC determination device can determine the angle between the polar axis and the polar diameter as the polar angle. Among them, the value range of the polar angle during the charging process is The SOC determination device can determine the polar coordinates of the target battery when it is charged according to the charging curve. The polar coordinates satisfy the following seventh formula:

[0136]

[0137] Among them, r can be used to represent the polar diameter, θ can be used to represent the polar angle, and V 1 It can be used to indicate the current voltage, 3.65 can be used to indicate the cut-off voltage, and Q can be used to indicate the battery capacity.

[0138] For example, Fig. 9 The figure shows a charging curve diagram of a target battery. Fig. 9 The charging curve in the figure is the charging curve of the LEP battery when it is charged at 0.1C at room temperature.

[0139] In one possible manner, the SOC determination device may establish a mapping relationship between the polar diameter and the polar angle.

[0140] Specifically, the SOC determination device can establish a corresponding relationship between the polar diameter and the polar angle (for example, Table 2). In the case where the charging current is step charging, the mapping relationship between the polar diameter and the polar angle will change with the current.

[0141] Alternatively, the SOC determination device may establish a functional relationship between the polar angle and the polar diameter. In the first embodiment, the SOC determination device may divide the polar angle into two intervals, that is, interval 1 may be a polar angle greater than or equal to -1.571 and less than 1.4. Interval 2 may be a polar angle greater than or equal to -1.4 and less than or equal to 0. The functional relationship corresponding to interval 1 satisfies the following eighth formula, the eighth formula:

[0142]

[0143] Where r can be used to represent the polar axis. θ can be used to represent the polar angle. i , b i and c i Can be used to represent undetermined constants.

[0144] a in the eighth formula i , b i and c i The values ​​can be found in Table 3 below.

[0145] Table 3

[0146] parameter Numeric parameter Numeric parameter Numeric <![CDATA[a 1 ]]> 7.51E+11 <![CDATA[b 1 ]]> -1.815 <![CDATA[c 1 ]]> 0.0453 <![CDATA[a 2 ]]> 0.228 <![CDATA[b 2 ]]> -1.575 <![CDATA[c 2 ]]> 0.02475 <![CDATA[a 3 ]]> 0.07267 <![CDATA[b 3 ]]> -1.539 <![CDATA[c 3 ]]> 0.03102 <![CDATA[a 4 ]]> 0.01037 <![CDATA[b 4 ]]> -1.496 <![CDATA[c 4 ]]> 0.0199 <![CDATA[a 5 ]]> 0.6211 <![CDATA[b 5 ]]> -1.754 <![CDATA[c 5 ]]> 0.5375

[0147] The functional relationship corresponding to interval 2 satisfies the following ninth formula:

[0148]

[0149] Where r can be used to represent the polar axis. θ can be used to represent the polar angle. i , b i and c i Can be used to represent undetermined constants.

[0150] a in the ninth formula i , b i and c i The values ​​can be found in Table 4 below.

[0151] Table 4

[0152] parameter Numeric parameter Numeric parameter Numeric <![CDATA[a 1 ]]> 0.21 <![CDATA[b 1 ]]> -0.2739 <![CDATA[c 1 ]]> 0.105 <![CDATA[a 2 ]]> 0.000727 <![CDATA[b 2 ]]> -0.0234 <![CDATA[c 2 ]]> 0.000233 <![CDATA[a 3 ]]> -0.02649 <![CDATA[b 3 ]]> -0.3006 <![CDATA[c 3 ]]> 0.03911 <![CDATA[a 4 ]]> -0.04251 <![CDATA[b 4 ]]> -0.00829 <![CDATA[c 4 ]]> 0.09412 <![CDATA[a 5 ]]> -0.139 <![CDATA[b 5 ]]> -0.3283 <![CDATA[c 5 ]]> 0.1275 <![CDATA[a 6 ]]> 0.4314 <![CDATA[b 6 ]]> -1.782 <![CDATA[c 6 ]]> 2.248 <![CDATA[a 7 ]]> 0.872 <![CDATA[b 7 ]]> 0.03737 <![CDATA[c 7 ]]> 0.5581

[0153] In one possible manner, the SOC determination device can determine the target polar angle and target polar diameter corresponding to the voltage at the current moment according to the functional relationship between the polar angle and the polar diameter, the seventh formula, and the voltage at the current moment. The SOC determination device can determine the battery capacity at the current moment according to the target polar angle, the target polar diameter, and the seventh formula. The SOC determination device can determine the SOC of the target battery according to the battery capacity at the current moment and the preset rated capacity.

[0154] Alternatively, the SOC determination device can determine the target polar angle and target polar diameter corresponding to the voltage at the current moment according to the correspondence between the polar angle and the polar diameter, the seventh formula and the voltage at the current moment. The SOC determination device can determine the battery capacity at the current moment according to the target polar angle, the target polar diameter and the seventh formula. The SOC determination device can determine the SOC of the target battery according to the battery capacity at the current moment and the preset rated capacity.

[0155] For example, the preset rated power is 88. The SOC determination device can determine the target pole diameter r 1 is 0.4087, the target polar angle θ 1 The SOC determination device can be used to determine the target diameter r 1 and the target polar angle θ 1 The current battery capacity is input into the second formula, and the current battery capacity is calculated to be 19.56 Ah. The SOC determination device can determine that the SOC of the target battery is 22.2% according to the current battery capacity and the preset rated capacity.

[0156] Embodiment 2:

[0157] In one possible manner, the SOC determination device can obtain the discharge curve of the target battery (for example, the discharge curve of the LEP battery at 0.1C discharge at room temperature) and the discharge cut-off voltage (for example, 2.5 volts). The SOC determines that the horizontal straight line where the discharge cut-off voltage is located is determined as the polar axis of the polar coordinates. The SOC determination device determines the point on the polar axis corresponding to the fully charged battery as the pole. The SOC determination device can determine the distance from the voltage value collected during the discharge process to the pole as the polar diameter. The SOC determination device can determine the angle between the polar axis and the polar diameter as the polar angle. Among them, the value range of the polar angle during the discharge process is The SOC determination device can determine the polar coordinates of the target battery when it is discharged according to the discharge curve. The polar coordinates satisfy the following tenth formula:

[0158]

[0159] Among them, r can be used to represent the polar diameter, θ can be used to represent the polar angle, and V 1 It can be used to indicate the current voltage, 3.65 can be used to indicate the cut-off voltage, and Q can be used to indicate the battery capacity.

[0160] For example, Fig.10 Shown is a discharge curve diagram of a target battery. Fig.10 The discharge curve in is the discharge curve of the LEP battery when it is discharged at 0.1C at room temperature.

[0161] In one possible manner, the SOC determination device may establish a mapping relationship between the polar diameter and the polar angle.

[0162] Specifically, the SOC determination device can establish a corresponding relationship between the pole diameter and the pole angle (for example, Table 1). In the case where the discharge current is a step discharge, the mapping relationship between the pole diameter and the pole angle will change with the current.

[0163] Alternatively, the SOC determination device can establish a functional relationship between the polar angle and the polar diameter. In the first embodiment, the SOC determination device can divide the polar angle into interval 1, interval 2 and interval 3, where interval 1 is when the polar angle θ is greater than or equal to 0 and less than 0.6. Interval 2 is when the polar angle θ is greater than or equal to 0.6 and less than 1.54. Interval 3 is when the polar angle is greater than or equal to 1.54 and less than or equal to 1.571. The functional relationship corresponding to interval 1 satisfies the following eleventh formula, eleventh formula:

[0164] r=0.377θ 2 +1.038.

[0165] Among them, r can be used to represent the polar axis, and θ can be used to represent the polar angle.

[0166] The functional relationship corresponding to interval 2 satisfies the following twelfth formula:

[0167]

[0168] Where r can be used to represent the polar axis. θ can be used to represent the polar angle. i , b i and c i Can be used to represent undetermined constants.

[0169] a in the twelfth formula i , b i and c i The values ​​can be found in Table 5 below.

[0170] Table 5

[0171] parameter Numeric parameter Numeric parameter Numeric <![CDATA[a 1 ]]> 0.12 <![CDATA[b 1 ]]> 0.5861 <![CDATA[c 1 ]]> 0.0494 <![CDATA[a 2 ]]> 0.03846 <![CDATA[b 2 ]]> 0.6639 <![CDATA[c 2 ]]> 0.06124 <![CDATA[a 3 ]]> 0.02321 <![CDATA[b 3 ]]> 0.7506 <![CDATA[c 3 ]]> 0.08513 <![CDATA[a 4 ]]> 0.2103 <![CDATA[b 4 ]]> 0.6912 <![CDATA[c 4 ]]> 0.2994 <![CDATA[a 5 ]]> 0.00627 <![CDATA[b 5 ]]> 1.131 <![CDATA[c 5 ]]> 0.06073 <![CDATA[a 6 ]]> 0.01727 <![CDATA[b 6 ]]> 1.197 <![CDATA[c 6 ]]> 0.1325 <![CDATA[a 7 ]]> 0.8882 <![CDATA[b 7 ]]> -0.7921 <![CDATA[c 7 ]]> 7.707

[0172] The functional relationship corresponding to interval 3 satisfies the following thirteenth formula:

[0173]

[0174] Among them, r can be used to represent the polar axis, and θ can be used to represent the polar angle.

[0175] In one possible manner, the SOC determination device can determine the target polar angle and target polar diameter corresponding to the voltage at the current moment according to the functional relationship between the polar angle and the polar diameter, the seventh formula, and the voltage at the current moment. The SOC determination device can determine the battery capacity at the current moment according to the target polar angle, the target polar diameter, and the seventh formula. The SOC determination device can determine the SOC of the target battery according to the battery capacity at the current moment and the preset rated capacity.

[0176] Alternatively, the SOC determination device can determine the target polar angle and target polar diameter corresponding to the voltage at the current moment according to the correspondence between the polar angle and the polar diameter, the seventh formula and the voltage at the current moment. The SOC determination device can determine the battery capacity at the current moment according to the target polar angle, the target polar diameter and the seventh formula. The SOC determination device can determine the SOC of the target battery according to the battery capacity at the current moment and the preset rated capacity.

[0177] For example, the preset rated power is 88. The SOC determination device can determine the target pole diameter r 1 is 0.8132, the target polar angle θ 1 The SOC determination device can be used to determine the target diameter r 1 and the target polar angle θ 1 Input into the second formula, calculate the battery capacity at the current moment, and obtain the battery capacity at the current moment as 82.83 Ah. The SOC determination device can determine that the SOC of the target battery is 94.1% according to the battery capacity at the current moment and the preset rated capacity.

[0178] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the SOC determination device or vehicle includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0179] The embodiments of the present application can divide the functional modules of the SOC determination device or vehicle according to the above method. For example, the SOC determination device or vehicle can include various functional modules corresponding to the various functional divisions, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0180] Fig.11 FIG. 1 is a block diagram of a SOC determination device according to an exemplary embodiment. Fig.11 The SOC determination device includes: an acquisition unit 501 and a determination unit 502.

[0181] In a possible manner, the acquisition unit 501 is used to acquire the voltage of the target battery of the vehicle at a current moment.

[0182] In a possible manner, the determination unit 502 is used to determine the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment.

[0183] In a possible manner, the determination unit 502 is further configured to determine the SOC of the target battery according to the battery capacity at a current moment and a preset rated capacity.

[0184] In one possible manner, the determination unit 502 is specifically used to: determine the target polar diameter and the target polar angle according to the first functional relationship, the first formula and the voltage at the current moment; determine the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula.

[0185] In a possible manner, the determination unit 502 is specifically configured to: determine the target polar diameter and the target polar angle according to the first corresponding relationship, the first formula and the voltage at the current moment, and determine the battery capacity at the current moment according to the target polar diameter, the target polar angle and the second formula.

[0186] In a possible manner, the acquisition unit 501 is further used to acquire the current ambient temperature of the battery and the current current of the target battery.

[0187] In a possible manner, the determination unit 502 is further configured to determine a target rule corresponding to the current ambient temperature and the current current from a plurality of preset rules.

[0188] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0189] Fig.12FIG. 1 is a block diagram of a vehicle according to an exemplary embodiment. Fig.12 As shown, the vehicle includes, but is not limited to, a processor 601 and a memory 602 .

[0190] The memory 602 is used to store executable instructions of the processor 601. It can be understood that the processor 601 is configured to execute instructions to implement the SOC determination method in the above embodiment.

[0191] It should be noted that those skilled in the art can understand that Fig.12 The vehicle structure shown in the figure does not constitute a limitation on the vehicle, and the vehicle may include Fig.12 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0192] The processor 601 is the control center of the vehicle, which uses various interfaces and lines to connect various parts of the entire vehicle, and executes various functions of the vehicle and processes data by running or executing software programs and / or modules stored in the memory 602, and calling data stored in the memory 602, so as to monitor the vehicle as a whole. The processor 601 may include one or more processing units. Optionally, the processor 601 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 601.

[0193] The memory 602 may be used to store software programs and various data. The memory 602 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a determination unit, a processing unit, etc.), etc. In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0194] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 602 including instructions, and the instructions can be executed by a processor 601 of a vehicle to implement the method in the above embodiment.

[0195] In actual implementation, Fig.11 The functions of the acquisition unit 501 and the determination unit 502 in the embodiment can be represented by Fig.12 The processor 601 in the embodiment calls the computer program stored in the memory 602. The specific execution process can refer to the description of the method part in the above embodiment, which will not be repeated here.

[0196] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0197] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, which can be executed by the processor 601 of the vehicle to complete the method in the above embodiment.

[0198] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the vehicle's processor, the various processes of the above-mentioned method embodiment are implemented, and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.

[0199] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0200] In the several 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 only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0201] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0202] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0203] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0204] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining SOC, characterized in that: Applied to vehicles, including: Obtaining the current voltage of the target battery of the vehicle; According to the target rule and the voltage at the current moment, the battery capacity of the target battery at the current moment is determined; the target rule is related to the polar diameter and polar angle of the target polar coordinate system; wherein the target rule includes a first preset relationship, a second preset relationship and a third preset relationship; the first preset relationship includes a first functional relationship and a first corresponding relationship; the first functional relationship is used to characterize the functional relationship between the polar diameter and the polar angle; the first corresponding relationship includes polar angles corresponding to multiple polar diameters; the second preset relationship is used to characterize the relationship between the polar diameter, the polar angle, the voltage at the current moment and the cut-off voltage; the third preset relationship is used to characterize the relationship between the polar diameter, the polar angle and the battery capacity; the target polar coordinate system is established based on a target curve; the target curve is used to characterize the mapping relationship between the sample voltage of the target battery and the sample battery capacity of the target battery; the polar diameter is used to characterize the distance between the pole of the target polar coordinate and the coordinate point on the target curve; the polar angle is used to characterize the angle between the polar axis of the target polar coordinate and the polar diameter; The second preset relationship satisfies a first formula, and the first formula is: Wherein, r is used to represent the polar diameter, is used to represent the polar angle, V1 is used to represent the voltage at the current moment, and V2 is used to represent the cut-off voltage; The third preset relationship satisfies a second formula, and the second formula is: Wherein, r is used to represent the polar diameter, is used to represent the polar angle, and Q is used to represent the battery capacity; The state of charge (SOC) of the target battery is determined according to the battery capacity at the current moment and the preset rated capacity.

2. The method according to claim 1, characterized in that The step of determining the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment includes: Determine a target polar diameter and a target polar angle according to the first functional relationship, the first formula and the voltage at the current moment; The battery capacity at the current moment is determined according to the target polar diameter, the target polar angle and the second formula.

3. The method according to claim 1, characterized in that The step of determining the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment includes: Determine a target polar diameter and a target polar angle according to the first corresponding relationship, the first formula and the voltage at the current moment; the target polar diameter, the target polar angle and the voltage at the current moment satisfy the first formula; The battery capacity at the current moment is determined according to the target polar diameter, the target polar angle and the second formula.

4. The method according to claim 2 or 3, characterized in that: The cut-off voltage corresponding to the target battery when being charged is the voltage when the target battery is fully discharged, and the cut-off voltage corresponding to the target battery when being discharged is the voltage when the target battery is fully charged.

5. The method according to claim 1, characterized in that The method further comprises: Acquire the current ambient temperature and the current current of the target battery; The target rule corresponding to the current ambient temperature and the current current is determined from a plurality of preset rules; the preset rule is related to the polar diameter and polar angle under a preset current and a preset ambient temperature.

6. A SOC determination device, characterized in that: The device comprises an acquisition unit and a determination unit; The acquisition unit is used to acquire the voltage of the target battery of the vehicle at the current moment; The determination unit is used to determine the battery capacity of the target battery at the current moment according to the target rule and the voltage at the current moment; wherein the target rule is related to the polar diameter and polar angle of the target polar coordinate system; the target rule includes a first preset relationship, a second preset relationship and a third preset relationship; the first preset relationship includes a first functional relationship and a first corresponding relationship; the first functional relationship is used to characterize the functional relationship between the polar diameter and the polar angle; the first corresponding relationship includes polar angles corresponding to multiple polar diameters; the second preset relationship is used to characterize the relationship between the polar diameter, the polar angle, the voltage at the current moment and the cut-off voltage; the third preset relationship is used to characterize the relationship between the polar diameter, the polar angle and the battery capacity; the target polar coordinate system is established based on a target curve; the target curve is used to characterize the mapping relationship between the sample voltage of the target battery and the sample battery capacity of the target battery; the polar diameter is used to characterize the distance between the pole of the target polar coordinate and the coordinate point on the target curve; the polar angle is used to characterize the angle between the polar axis of the target polar coordinate and the polar diameter; The second preset relationship satisfies a first formula, and the first formula is: Wherein, r is used to represent the polar diameter, is used to represent the polar angle, V1 is used to represent the voltage at the current moment, and V2 is used to represent the cut-off voltage; The third preset relationship satisfies a second formula, and the second formula is: Wherein, r is used to represent the polar diameter, is used to represent the polar angle, and Q is used to represent the battery capacity; The determination unit is further configured to determine the state of charge (SOC) of the target battery according to the battery capacity at the current moment and a preset rated capacity.

7. The device according to claim 6, characterized in that The determining unit is specifically configured to: Determine a target polar diameter and a target polar angle according to the first functional relationship, the first formula and the voltage at the current moment; The battery capacity at the current moment is determined according to the target polar diameter, the target polar angle and the second formula.

8. A vehicle, characterized in that: The vehicle comprises: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that: When the computer-executable instructions stored in the computer-readable storage medium are executed by a processor of a vehicle, the vehicle can perform the method as claimed in any one of claims 1 to 5.

10. A computer program product comprising instructions, characterized in that When the instructions are executed by a computer, the computer is caused to perform the method according to any one of claims 1 to 5.

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