Discharge tail end SOC correction method, device and system, vehicle and equipment

Abstract

The invention relates to a discharge tail end SOC correction method, device and system, a vehicle and equipment, and relates to the technical field of vehicles. The method comprises the following steps: acquiring a first discharge parameter and a first SOC value when a target battery works; judging whether the first discharge parameter meets a preset condition, wherein the preset condition is related to a first actually measured discharge parameter corresponding to the first actually measured SOC value; wherein the first actually measured SOC and the first actually measured discharge parameter meet a target mapping relation; the target mapping relation comprises actually measured discharge parameters in one-to-one correspondence with the plurality of actually measured SOC values; the target mapping relation is obtained after actual discharge measurement is carried out on the battery of the same model as the target battery; and when the first discharge parameter meets a preset condition and the first actually measured SOC value is smaller than the first SOC value, correcting the first SOC value based on the first actually measured SOC value. Therefore, the SOC value of the target battery can be corrected, and the SOC value is prevented from jumping.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, in particular to the field of automobile battery technology, and specifically to a method, device, system, vehicle and equipment for correcting end-of-discharge SOC. Background Art

[0002] In recent years, lithium iron phosphate batteries have gradually become the mainstream choice in the field of electric vehicle power supply. However, due to the existence of a long platform area in the voltage characteristics of lithium iron phosphate batteries, the estimation of SOC mainly depends on the current collected by the current sensor for ampere-hour integration. If the sampling accuracy of the current sensor is insufficient, or the vehicle is in a state of shallow charge and discharge for a long time (that is, the battery power is not regularly fully charged or drained), a series of problems may occur, such as large SOC estimation deviation, sudden jump in SOC value, and power interruption.

[0003] A related technology proposes to determine the open circuit voltage OCV of the battery during operation based on the DC resistance of the battery, and then look up the corresponding SOC target value through an OCV-SOC table, but the correction error of this technology is large.

[0004] Another related technology proposes to correct the calculated SOC value of the second battery cell according to the target SOC value and the calculated SOC value of the first battery cell to obtain a corrected SOC value of the second battery cell, but the correction error of this technology is also large. Summary of the invention

[0005] The present application provides a method, device, system, vehicle and equipment for correcting the SOC at the end of discharge, so as to at least solve the technical problem in the related art that the SOC estimation deviation is large and causes the SOC value to jump. The technical solution of the present application is as follows:

[0006] According to a first aspect provided by the present application, a method for correcting the SOC at the end of discharge is provided, comprising: obtaining a first discharge parameter and a first SOC value when a target battery is working; judging whether the first discharge parameter satisfies a preset condition, the preset condition being related to the first measured discharge parameter corresponding to the first measured SOC value; wherein the first measured SOC and the first measured discharge parameter satisfy a target mapping relationship; the target mapping relationship comprises: measured discharge parameters corresponding one-to-one to a plurality of measured SOC values; the target mapping relationship is obtained after discharge measurement is performed on a battery of the same model as the target battery; when the first discharge parameter satisfies the preset condition and the first measured SOC value is less than the first SOC value, the first SOC value is corrected based on the first measured SOC value.

[0007] According to the above technical means, the present application can reduce the SOC estimation error caused by battery state changes, environmental factors, etc. by correcting the first SOC value based on the discharge parameter and target mapping relationship, and the corrected SOC value can more accurately reflect the remaining power of the battery, avoiding the sudden shutdown or malfunction of the device due to inaccurate power estimation. In one possible implementation, the first discharge parameter includes: a first discharge current, a first discharge voltage, and a first battery temperature; the first measured discharge parameter includes: a first measured discharge current, a first measured discharge voltage, and a first measured battery temperature; the preset conditions include: when the first battery temperature is equal to the first measured battery temperature, the first discharge current is less than or equal to the first measured discharge current, and the duration of the first discharge voltage being less than or equal to the first measured discharge voltage exceeds the first duration threshold.

[0008] In a possible implementation, the target mapping relationship includes: sub-mapping relationships corresponding to a plurality of measured discharge currents; and the sub-mapping relationships include: measured discharge voltages corresponding to a plurality of measured SOC values ​​at different measured battery temperatures.

[0009] In one possible implementation, the measured discharge current is less than a preset current threshold; the preset current threshold is the current threshold that triggers the target battery discharge terminal power limitation; the measured discharge voltage is less than a preset voltage threshold; the preset voltage threshold is the voltage threshold that triggers the target battery discharge terminal power limitation.

[0010] According to the above-mentioned technical means, the present application can make fine corrections to the SOC value under different discharge conditions through the target mapping relationship, thereby improving the accuracy of SOC estimation, and by considering the duration of the discharge current and discharge voltage, it can better adapt to complex discharge conditions and ensure the accuracy and stability of SOC estimation.

[0011] In one possible implementation, before the step of determining whether the first discharge parameter satisfies a preset condition, the method includes: determining a target sub-mapping relationship corresponding to the first discharge current from the target mapping relationship; determining an SOC value interval in which the first SOC value is located based on a magnitude relationship between the first SOC value and different measured SOC values; determining a first measured SOC value corresponding to the SOC value interval; and determining a first measured voltage from the target sub-mapping relationship based on the first measured SOC value and a first battery temperature.

[0012] According to the above-mentioned technical means, before the step of judging whether the first discharge parameter meets the preset condition, the present application can, based on the first discharge parameter and the first SOC value when the target battery is working, confirm from the target mapping relationship that the preset condition requires the use of the first measured SOC value and the first measured voltage, thereby supporting the subsequent rapid judgment of whether the first discharge parameter meets the preset condition, that is, efficiently correcting the SOC of the target battery.

[0013] In one possible implementation, based on the first measured SOC value and the first battery temperature, determining the first measured voltage from the target sub-mapping relationship includes: when the first battery temperature is greater than the first temperature and less than the second temperature, determining the second measured discharge voltage and the third measured discharge voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature; the measured temperature corresponding to the second measured discharge voltage and the measured temperature corresponding to the third measured discharge voltage are both adjacent to the first battery temperature; the first temperature is the lowest temperature included in the target sub-mapping relationship; the second temperature is the highest temperature included in the target sub-mapping relationship; based on the first battery temperature, the measured temperature corresponding to the second measured discharge voltage and the measured temperature corresponding to the third measured discharge voltage, interpolating the second measured discharge voltage and the third measured discharge voltage to obtain the first measured voltage.

[0014] According to the above technical means, the present application can estimate the first measured voltage by interpolation calculation to determine known data points (here the second measured discharge voltage and the third measured discharge voltage and their corresponding temperatures), thereby obtaining a more accurate result than directly looking up a table.

[0015] In a possible implementation method, the target mapping relationship is determined in the following manner: for each discharge parameter among multiple discharge parameters, the target battery cell is discharged under each discharge parameter, and the discharge voltage corresponding to each of the multiple SOC values ​​of the target battery cell during the discharge process is determined; the target battery cell is a battery cell of the same model as the target battery; the SOC value is less than a preset SOC threshold; the preset SOC threshold is the SOC threshold that triggers the target battery discharge end power limit; based on the discharge voltages corresponding to each of the multiple SOC values, an initial mapping relationship is established; if the fourth measured discharge voltage is greater than the preset voltage threshold, the initial mapping relationship is corrected based on the preset voltage threshold to obtain the target mapping relationship, and if the fourth measured discharge voltage is less than or equal to the preset voltage threshold, the initial mapping relationship is determined as the target mapping relationship; the fourth measured discharge voltage is the maximum discharge voltage in the initial mapping relationship.

[0016] According to the above technical means, the present application can correct the initial mapping relationship by presetting the voltage threshold, eliminate or reduce the influence of measurement errors and battery cell performance differences, thereby improving the accuracy of the mapping relationship.

[0017] In one possible implementation, the initial mapping relationship is corrected based on a preset voltage threshold to obtain a target mapping relationship, including: correcting the fourth measured discharge voltage to the preset voltage threshold; based on the difference between the fourth measured discharge voltage and the preset voltage threshold, correcting other measured discharge voltages in the initial mapping relationship except the fourth measured discharge voltage to obtain the target mapping relationship.

[0018] According to the above-mentioned technical means, the present application can correct the maximum discharge voltage (the fourth measured discharge voltage) in the target mapping relationship to be close to the voltage trigger threshold (preset voltage threshold) of the discharge end power limit, and based on the difference between the fourth measured discharge voltage and the preset voltage threshold, correct the other discharge voltages in the initial mapping relationship except the fourth measured discharge voltage to obtain the target mapping relationship, so as to avoid the problem of SOC being incorrectly corrected when the target mapping relationship is used subsequently, resulting in a low SOC value.

[0019] In one possible implementation, an SOC value correction rate is determined based on a difference between a first measured SOC value and a first SOC value; the SOC value correction rate represents the time required for the first SOC value to jump to a preset step size; and the first SOC value is corrected based on the SOC value correction rate.

[0020] According to the above technical means, the present application can correct the SOC value at a preset rate to avoid sudden jumps in the SOC value that may cause user anxiety, allowing users to more intuitively understand changes in the battery status and make more reasonable charging and usage decisions.

[0021] According to a second aspect provided by the present application, a discharge end SOC correction device is provided, including: an acquisition unit, a judgment unit and a correction unit; the acquisition unit is used to acquire a first discharge parameter and a first SOC value when a target battery is working; the judgment unit is used to judge whether the first discharge parameter meets a preset condition, and the preset condition is related to the first measured discharge parameter corresponding to the first measured SOC value; wherein the first measured SOC and the first measured discharge parameter meet a target mapping relationship; the target mapping relationship includes: measured discharge parameters corresponding to multiple measured SOC values ​​one by one; the target mapping relationship is obtained after discharge measurement for a battery of the same model as the target battery; the correction unit is used to correct the first SOC value based on the first measured SOC value when the first discharge parameter meets the preset condition and the first measured SOC value is less than the first SOC value.

[0022] In one possible implementation, the device also includes: a determination unit; a determination unit, used to determine a target sub-mapping relationship corresponding to the first discharge current from the target mapping relationship; the determination unit, also used to determine the SOC value interval in which the first SOC value is located based on the size relationship between the first SOC value and different measured SOC values; the determination unit, also used to determine the first measured SOC value corresponding to the SOC value interval; the determination unit, also used to determine the first measured voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature.

[0023] In one possible implementation, the determination unit is specifically used to: determine the second measured discharge voltage and the third measured discharge voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature when the first battery temperature is greater than the first temperature and less than the second temperature; the measured temperature corresponding to the second measured discharge voltage and the measured temperature corresponding to the third measured discharge voltage are both adjacent to the first battery temperature; the first temperature is the lowest temperature included in the target sub-mapping relationship; the second temperature is the highest temperature included in the target sub-mapping relationship; based on the first battery temperature, the measured temperature corresponding to the second measured discharge voltage and the measured temperature corresponding to the third measured discharge voltage, interpolate the second measured discharge voltage and the third measured discharge voltage to obtain the first measured voltage.

[0024] In one possible implementation, the determination unit is specifically used to: for each discharge parameter among multiple discharge parameters, discharge the target battery cell under each discharge parameter, and determine the discharge voltage corresponding to each of the multiple SOC values ​​of the target battery cell during the discharge process; the target battery cell is a battery cell of the same model as the target battery; the SOC value is less than a preset SOC threshold; the preset SOC threshold is the SOC threshold that triggers the target battery end-of-discharge power limit; based on the discharge voltages corresponding to each of the multiple SOC values, an initial mapping relationship is established; if the fourth measured discharge voltage is greater than the preset voltage threshold, the initial mapping relationship is corrected based on the preset voltage threshold to obtain a target mapping relationship, and if the fourth measured discharge voltage is less than or equal to the preset voltage threshold, the initial mapping relationship is determined as the target mapping relationship; the fourth measured discharge voltage is the maximum discharge voltage in the initial mapping relationship.

[0025] In a possible implementation, the determination unit is specifically configured to: correct the fourth measured discharge voltage to a preset voltage threshold;

[0026] Based on the difference between the fourth measured discharge voltage and the preset voltage threshold, other measured discharge voltages except the fourth measured discharge voltage in the initial mapping relationship are corrected to obtain a target mapping relationship.

[0027] In one possible implementation, the correction unit is specifically used to: determine the SOC value correction rate based on the difference between the first measured SOC value and the first SOC value; the SOC value correction rate represents the time required for the first SOC value to jump to a preset step size; based on the SOC value correction rate, correct the first SOC value.

[0028] According to a third aspect provided by the present application, a discharge end SOC correction system is provided, the system comprising: a data acquisition device and a discharge end SOC correction device; the data acquisition device is used to obtain a first discharge parameter and a first SOC value when a target battery is working; a discharge end SOC correction device is used to determine whether the first discharge parameter meets a preset condition, the preset condition is related to the first measured discharge parameter corresponding to the first measured SOC value; wherein the first measured SOC and the first measured discharge parameter meet a target mapping relationship; the target mapping relationship comprises: measured discharge parameters corresponding to a plurality of measured SOC values ​​one by one; the target mapping relationship is obtained after discharge measurement for a battery of the same model as the target battery; the discharge end SOC correction device is used to correct the first SOC value based on the first measured SOC value when the first discharge parameter meets the preset condition and the first measured SOC value is less than the first SOC value.

[0029] According to a fourth aspect provided by the present application, a vehicle is provided, the vehicle comprising the end-of-discharge SOC correction system provided by the third aspect.

[0030] According to the fifth aspect provided by the present application, an electronic device 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.

[0031] According to the sixth 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 a processor of an electronic device, the electronic device is enabled to execute the method in the above-mentioned first aspect and any possible implementation method thereof.

[0032] According to the seventh 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 an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0033] Therefore, the above technical features of the present application have the following beneficial effects:

[0034] (1) The first SOC value can be corrected based on the discharge parameter and target mapping relationship to reduce the SOC estimation error caused by battery state changes, environmental factors, etc., and the corrected SOC value can more accurately reflect the remaining power of the battery, thereby avoiding the sudden shutdown or malfunction of the device due to inaccurate power estimation.

[0035] (2) The SOC value can be finely corrected under different discharge conditions through the target mapping relationship, thereby improving the accuracy of SOC estimation. By considering the duration of discharge current and discharge voltage, it can better adapt to complex discharge conditions and ensure the accuracy and stability of SOC estimation.

[0036] (3) Before the step of determining whether the first discharge parameter satisfies the preset condition, based on the first discharge parameter and the first SOC value of the target battery when it is working, the preset condition requiring the use of the first measured SOC value and the first measured voltage can be determined from the target mapping relationship, thereby supporting the subsequent rapid determination of whether the first discharge parameter satisfies the preset condition, that is, efficiently correcting the SOC of the target battery.

[0037] (4) The first measured voltage can be estimated by determining known data points (here, the second measured discharge voltage and the third measured discharge voltage and their corresponding temperatures) through interpolation calculation, thereby obtaining a more accurate result than directly looking up the table.

[0038] (5) The initial mapping relationship can be corrected by presetting the voltage threshold to eliminate or reduce the influence of measurement errors and cell performance differences, thereby improving the accuracy of the mapping relationship.

[0039] (6) The maximum discharge voltage (the fourth measured discharge voltage) in the target mapping relationship can be corrected to be close to the voltage trigger threshold (the preset voltage threshold) of the discharge end power limit, and based on the difference between the fourth measured discharge voltage and the preset voltage threshold, the other discharge voltages in the initial mapping relationship except the fourth measured discharge voltage are corrected to obtain the target mapping relationship, so as to avoid the problem of SOC being incorrectly corrected when the target mapping relationship is used subsequently, resulting in a low SOC value.

[0040] (7) The SOC value can be corrected at a preset rate to avoid sudden jumps in the SOC value that may cause user anxiety, allowing users to more intuitively understand changes in battery status and make more reasonable charging and usage decisions.

[0041] It should be noted that the technical effects brought about by any implementation method in the second to seventh aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0042] 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

[0043] 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.

[0044] Figure 1 is a schematic diagram of a vehicle architecture according to an exemplary embodiment;

[0045] Figure 2 is a schematic diagram showing a method for correcting SOC at the end of discharge according to an exemplary embodiment;

[0046] Figure 3 is a schematic diagram of an SOC correction process according to an exemplary embodiment;

[0047] Figure 4 is a block diagram of a discharge end SOC correction device according to an exemplary embodiment;

[0048] Figure 5 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] First, the relevant technologies involved in this application are explained to facilitate understanding by those skilled in the art.

[0052] In recent years, lithium iron phosphate batteries have gradually become the mainstream choice in the field of electric vehicle power supply. Compared with ternary lithium batteries, lithium iron phosphate batteries show more significant cost advantages, and the decay rate of their battery cell capacity is relatively slower. Therefore, in recent years, lithium iron phosphate batteries have gradually become the first choice for electric vehicle power supply. SOC, as a key indicator to measure the ratio of the remaining capacity of the battery to the rated capacity, is crucial to accurately reflect the specific value of the remaining battery power. The accuracy of SOC estimation is closely related to the safety, reliability and accuracy of energy management of the battery system. Therefore, in the battery management system (BMS), SOC estimation is regarded as one of the most core functions.

[0053] However, due to the long platform area in the voltage characteristics of lithium iron phosphate batteries, the estimation of SOC mainly depends on the current collected by the current sensor for ampere-hour integration. If the sampling accuracy of the current sensor is insufficient, or the vehicle is in a state of shallow charge and discharge for a long time (that is, the battery power is not regularly fully charged or drained), a series of problems may occur, such as large SOC estimation deviation, sudden jump in SOC value, and power interruption.

[0054] A related technology proposes to determine the open circuit voltage OCV of the battery during operation based on the DC resistance of the battery, and then look up the corresponding SOC target value through an OCV-SOC table, but the correction error of this technology is large.

[0055] Another related technology proposes to correct the calculated SOC value of the second battery cell according to the target SOC value and the calculated SOC value of the first battery cell to obtain a corrected SOC value of the second battery cell, but the correction error of this technology is also large.

[0056] As described in the background technology, in order to solve the problems of large SOC estimation deviation and sudden jump of SOC value in the related technology, the present application provides a method for correcting SOC at the end of discharge, which can obtain the discharge parameters and a first SOC value of the target battery when it is working, wherein the first SOC value is the SOC value corresponding to the discharge parameters, so as to further correct the first SOC value based on the discharge parameters and the target mapping relationship when the discharge parameters meet the first preset condition, so as to obtain a corrected SOC value, wherein the target mapping relationship is the mapping relationship between different discharge parameters and SOC values, the corrected SOC value is less than the first SOC value, and the corrected SOC value is the SOC value corresponding to the discharge parameters in the target mapping relationship; the first preset condition is the preset condition corresponding to the first SOC value, and the first SOC value is corrected based on the discharge parameters and the target mapping relationship, which can improve the accuracy of the SOC and avoid the problem of sudden jump of the SOC value, which affects the user experience.

[0057] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0058] The discharge end SOC correction method provided in the embodiment of the present application can be applied in a vehicle. A vehicle can also be referred to as a vehicle, a mobile carrier, an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a fuel cell vehicle (FCV), an autonomous vehicle, an intelligent and connected vehicle (ICV), a driverless vehicle, etc.

[0059] In the embodiments of the present application, the vehicle may be a sedan, a sport utility vehicle (SUV), a truck, an electric vehicle, a motorcycle, a tricycle, a special vehicle (such as an ambulance, a fire truck, a police car, etc.), an unmanned taxi, an intelligent networked bus, an automatic driving logistics vehicle, an electric truck, etc. In addition, the method is also applicable to various special vehicles, such as agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, port vehicles, etc. The present application does not impose specific restrictions on this.

[0060] In the embodiment of the present application, the battery may be a lithium iron phosphate battery or other lithium atomic battery, and the present application does not impose any specific limitation on this.

[0061] For example, Figure 1 As shown, Figure 1 is a schematic structural diagram of a vehicle 100 according to an exemplary embodiment.

[0062] In a possible implementation, the vehicle 100 may include an end-of-discharge SOC correction device 101 , a data acquisition device 102 , and a target battery 103 .

[0063] Optionally, Figure 1 A communication connection can be established between the discharge end SOC correction device 101 and the data acquisition device 102. A connection can be established between the data acquisition device 102 and the target battery 103. A connection can be established between the discharge end SOC correction device 101 and the target battery 103.

[0064] In practical applications, the end-of-discharge SOC correction device 101 may be communicatively connected to one or more data acquisition devices 102 .

[0065] For ease of understanding, the present application takes the communication connection between a discharge end SOC correction device 101 and a data acquisition device 102 as an example for explanation.

[0066] Optional, Figure 1 The discharge end SOC correction device 101 and the data acquisition device 102 may be functional modules integrated in the same device, or may be devices independently arranged from each other. This application does not limit this.

[0067] It is easy to understand that when the discharge end SOC correction device 101 and the data acquisition device 102 are functional modules integrated in the same device, the communication method between the discharge end SOC correction device 101 and the data acquisition device 102 is the communication between the internal modules of the device. In this case, the communication process between the two is the same as the "communication process when the discharge end SOC correction device 101 and the data acquisition device 102 are independently set up".

[0068] For ease of understanding, the present application is mainly explained by taking the example that the end-of-discharge SOC correction device 101 and the data acquisition device 102 are independently configured.

[0069] Figure 1 The data acquisition device 102 can collect the discharge parameters and the first SOC value of the target battery when it is working, and the end-of-discharge SOC correction device 101 can receive the discharge parameters and the first SOC value of the target battery when it is working sent by the data acquisition device 102, and determine whether the first discharge parameter meets the preset condition, so as to further correct the first SOC value based on the first measured SOC value when the first discharge parameter meets the preset condition and the first measured SOC value is less than the first SOC value.

[0070] Optionally, Figure 1 The end-of-discharge SOC correction device 101 may be a terminal, a server, or other types of electronic devices. Figure 1 What is shown in the figure is only an example of the device form of the end-of-discharge SOC correction device 101, and does not constitute a limitation thereto.

[0071] In the case where the end-of-discharge SOC correction device 101 is a terminal, the terminal may be a device for providing voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The terminal may communicate with one or more core networks via a radio access network (RAN). The terminal may be a mobile terminal, such as a computer with a mobile terminal, or a mobile device built into the vehicle 100, which exchanges language and / or data with a radio access network, such as a mobile phone, a tablet computer, a laptop computer, a netbook, a personal digital assistant (PDA). This application does not impose any restrictions on this.

[0072] When the end-of-discharge SOC correction device 101 is a server, the server may be a single server, or a server cluster composed of multiple servers. In some implementations, the server cluster may also be a distributed cluster. This application does not impose any limitation on this.

[0073] It should be noted that the structure illustrated in the embodiment of the present application does not constitute a limitation on the vehicle 100. It may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0074] For ease of understanding, the end-of-discharge SOC correction method provided by the present application is specifically introduced below with reference to the accompanying drawings.

[0075] Figure 2 FIG. 1 is a flow chart of a method for correcting the SOC at the end of discharge according to an exemplary embodiment. Figure 2 As shown, the end-of-discharge SOC correction method includes the following steps: S201-S203.

[0076] S201. Obtain a first discharge parameter and a first SOC value of a target battery when the target battery is operating.

[0077] The first SOC value may be an SOC value calculated based on the first discharge parameter.

[0078] Optionally, the target battery can be a power battery deployed on a vehicle, or a battery of other electronic devices. The material of the target battery can be set according to actual needs. For example, the target battery can be a lithium iron phosphate battery, or other lithium-ion sub-batteries. This application does not make specific restrictions on this.

[0079] In one possible implementation, the discharge parameters of the target battery when it is working may include, but are not limited to: battery temperature (temperature of the battery cell in the battery pack), battery voltage (voltage corresponding to the battery cell with the lowest voltage in the battery pack), and discharge current of the target battery (total current of the battery pack). The data acquisition device may be connected to the target battery, and when the target battery is working, the data acquisition device may collect the first discharge parameter of the target battery.

[0080] In another possible implementation, the end-of-discharge SOC correction device may receive the first discharge parameter of the target battery when it is working, which is sent by the data acquisition device, and calculate the real SOC value of the target battery based on the discharge parameter, that is, the first SOC value. The end-of-discharge SOC correction device may send the first SOC value to a display device, and display the first SOC value, that is, display SOC, through the display device.

[0081] Optionally, the first discharge parameter may include: a first discharge current, a first discharge voltage and a first battery temperature.

[0082] S202: Determine whether the first discharge parameter meets a preset condition.

[0083] In one possible implementation, the preset condition may be related to a first measured discharge parameter corresponding to the first measured SOC value. The first measured SOC and the first measured discharge parameter satisfy a target mapping relationship. The target mapping relationship includes: measured discharge parameters corresponding to multiple measured SOC values ​​one by one, and the target mapping relationship is obtained after discharge measurement of a battery of the same model as the target battery.

[0084] Optionally, the first measured discharge parameter may include: a first measured discharge current, a first measured discharge voltage, and a first measured battery temperature. The preset condition may include: when the first battery temperature is equal to the first measured battery temperature, the first discharge current is less than or equal to the first measured discharge current, and the duration of the first discharge voltage being less than or equal to the first measured discharge voltage exceeds a first duration threshold. This application does not impose specific restrictions on this.

[0085] In one possible implementation, the target mapping relationship may include: a plurality of sub-mapping relationships corresponding to each of the measured discharge currents. The sub-mapping relationships may include: a plurality of measured discharge voltages corresponding to the measured SOC values ​​at different measured battery temperatures. The measured discharge current may be less than a preset current threshold, which is a current threshold that triggers the target battery discharge terminal power limit. The measured discharge voltage may be less than a preset voltage threshold, which is a voltage threshold that triggers the target battery discharge terminal power limit.

[0086] Optionally, the preset current threshold can be set according to actual needs. For example, the preset voltage threshold can be 1 ampere (A) or 2 A. This application does not impose specific restrictions on this.

[0087] Optionally, the preset voltage threshold can be set according to actual needs. For example, the preset voltage threshold can be 5 volts (V) or 10 V. This application does not impose specific restrictions on this.

[0088] In one example, as shown in Table 1, it is a schematic diagram of a target mapping relationship provided by the present application.

[0089] Table 1

[0090]

[0091] Among them, the discharge rate is used to characterize the current intensity required for the battery to discharge its rated capacity within a certain period of time. The discharge cut-off voltage (also known as the termination voltage) refers to the lowest operating voltage value at which the battery voltage drops to a level that is not suitable for further discharge during the discharge process. The setting of temperature values ​​T1 to T5 covers the temperature range of the battery pack during the discharge process, including its highest and lowest temperatures, including the three representative temperature points of standard room temperature, high temperature and low temperature. In addition, the discharge rates I1 to I3 are set to three different discharge current values, and I1 is less than I2, and I2 is less than I3. In particular, the maximum discharge current value I3 is less than the current threshold that can trigger the end-of-discharge power limit protection. At the same time, the SOC correction points SOC1 to SOC3 need to be set to three different SOC values, and SOC1 is less than SOC2, and SOC2 is less than SOC3.

[0092] In one possible implementation, the end-of-discharge SOC correction device may determine a target sub-mapping relationship corresponding to the first discharge current from the target mapping relationship. The end-of-discharge SOC correction device may determine the SOC value interval in which the first SOC value is located based on the magnitude relationship between the first SOC value and different measured SOC values. The end-of-discharge SOC correction device may determine the first measured SOC value corresponding to the SOC value interval. The end-of-discharge SOC correction device may determine the first measured voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature.

[0093] It should be noted that the discharge end SOC correction device can determine the second measured discharge voltage and the third measured discharge voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature when the first battery temperature is greater than the first temperature and less than the second temperature. The discharge end SOC correction device can interpolate the second measured discharge voltage and the third measured discharge voltage based on the first battery temperature, the measured temperature corresponding to the second measured discharge voltage, and the measured temperature corresponding to the third measured discharge voltage to obtain the first measured voltage.

[0094] The measured temperature corresponding to the second measured discharge voltage and the measured temperature corresponding to the third measured discharge voltage are both adjacent to the first battery temperature. The first temperature is the lowest temperature included in the target sub-mapping relationship. The second temperature is the highest temperature included in the target sub-mapping relationship.

[0095] Specifically, the discharge end SOC correction device can determine the target sub-mapping relationship corresponding to the first discharge current from the sub-mapping relationships corresponding to the multiple measured discharge currents included in the target mapping relationship, that is, the discharge end SOC correction device can determine the first measured discharge current corresponding to the first discharge current from the multiple measured discharge currents, so as to determine the sub-mapping relationship corresponding to the first measured discharge current as the target sub-mapping relationship.

[0096] The first discharge current is smaller than a first measured discharge current corresponding to the first discharge current, and larger than a second measured discharge current. The second measured discharge current is a current smaller than the first measured discharge current among multiple measured discharge currents.

[0097] In one example, in combination with Table 1, the first discharge current is less than I3 and greater than I2. The first battery temperature is less than T1 and greater than T2. ​​The first SOC value is greater than SOC3. The end-of-discharge SOC correction device can determine, based on the first discharge current, that the first measured discharge voltage is I3, and the target sub-mapping relationship is the sub-mapping relationship corresponding to I3. The end-of-discharge SOC correction device can determine, based on the size relationship between the first SOC value and different measured SOC values, that the SOC value interval in which the first SOC value is located is an interval greater than SOC3. The end-of-discharge SOC correction device can determine that the first measured SOC value corresponding to the interval greater than SOC3 is SOC3. The end-of-discharge SOC correction device can determine the second measured discharge voltage V from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature when the first battery temperature is greater than the first temperature T5 and less than the second temperature T1. 42 and the third measured discharge voltage V 42 The discharge end SOC correction device can be based on the first battery temperature, the second measured discharge voltage V 42 The corresponding measured temperature T2 and the third measured discharge voltage V 42 The corresponding measured temperature T1 is the second measured discharge voltage V 42 and the third measured discharge voltage V 41 An interpolation calculation is performed to obtain a first measured voltage.

[0098] In one possible implementation, the discharge end SOC correction device can determine whether the current target battery is in a discharge condition. The discharge end SOC correction device can determine that the target battery is in a discharge condition when the discharge current is greater than zero and the target battery is not connected to a charging device. The discharge end SOC correction device can determine whether the first discharge parameter meets a preset condition when the target battery is in a discharge condition.

[0099] In yet another example, the target mapping relationship may include multiple correction points, for example, in combination with Table 1, SOC1, SOC2, and SOC3.

[0100] S203 . When the first discharge parameter meets a preset condition and the first measured SOC value is less than the first SOC value, correct the first SOC value based on the first measured SOC value.

[0101] In one possible implementation, the end-of-discharge SOC correction device may determine the SOC value correction rate based on the difference between the first measured SOC value and the first SOC value. The end-of-discharge SOC correction device may correct the first SOC value based on the SOC value correction rate. The SOC value correction rate represents the time required for the first SOC value to jump to a preset step size.

[0102] In another possible implementation, the end-of-discharge SOC correction device can repeatedly correct the SOC value of the target battery based on the target mapping relationship and the discharge parameters until the SOC value of the target battery is corrected to an appropriate value, that is, when the first discharge parameter does not meet the preset conditions, the first SOC value is corrected to the first measured SOC value. Furthermore, the end-of-discharge SOC correction device continuously determines whether the corrected first SOC value and the discharge parameters of the target battery meet the preset conditions, thereby repeatedly correcting the SOC of the target battery.

[0103] In one example, in combination with Table 1, Figure 3As shown, it is a schematic diagram of an SOC correction process. The SOC correction device at the end of discharge can obtain the real SOC value of the target battery, the discharge parameters, and the displayed SOC value. The real SOC value is also the first SOC value. The SOC correction device at the end of discharge can determine whether the target battery is in a discharge condition, that is, whether the discharge current is greater than 0, and whether the target battery is connected to a charging device. The SOC correction device at the end of discharge can determine whether the first time length is greater than or equal to the time threshold, and whether the second time length is greater than or equal to the time threshold when the target battery is in a discharge condition, wherein the first time length is the duration of the discharge current being less than or equal to the preset current threshold I3, and the second time length is the duration of the discharge voltage being less than or equal to the voltage threshold (the voltage value corresponding to SOC3 in the target mapping relationship). The SOC correction device at the end of discharge can determine whether the real SOC value is greater than or equal to the SOC value corresponding to the first correction point (for example, SOC3) when the first time length is greater than or equal to the time threshold, and the second time length is greater than or equal to the time threshold. The end-of-discharge SOC correction device can correct the actual SOC value to be greater than or equal to the SOC value corresponding to the first correction point (for example, correcting the actual SOC value to SOC3) when the actual SOC value is greater than or equal to the SOC value corresponding to the first correction point. The end-of-discharge SOC correction device can correct the displayed SOC value to the SOC value corresponding to the first correction point at a preset rate (for example, correcting the displayed SOC value to SOC3 at a preset rate).

[0104] The discharge end SOC correction device can repeat the above steps when the displayed SOC value is the same as the actual SOC value, correct the actual SOC to the SOC value corresponding to the second correction point (for example, SOC2), and repeat the above steps until the actual SOC is corrected to the SOC value corresponding to the discharge parameter (for example, SOC1). The discharge end SOC correction device can correct the displayed SOC value to the SOC value corresponding to the discharge parameter at a preset rate. The discharge end SOC correction device can end the process when the displayed SOC value is the same as the actual SOC value.

[0105] The end-of-discharge SOC correction device can re-obtain the real SOC value, discharge parameters, and display SOC value of the target battery when the target battery is not in a discharging condition.

[0106] The end-of-discharge SOC correction device can re-acquire the actual SOC value of the target battery, the discharge parameters, and display the SOC value when the first time length is less than the time threshold and the second time length is less than the time threshold.

[0107] The end-of-discharge SOC correction device can re-acquire the actual SOC value of the target battery, the discharge parameters, and the displayed SOC value when the actual SOC value is less than the SOC value corresponding to the first correction point.

[0108] Based on this, the present application can correct the first SOC value based on the discharge parameters and the target mapping relationship to reduce the SOC estimation error caused by changes in battery status, environmental factors, etc., and the corrected SOC value can more accurately reflect the remaining power of the battery, avoiding sudden shutdown or inability to use the device due to inaccurate power estimation.

[0109] based on Figure 2 The method described in the technical solution provided by the present application can correct the first SOC value based on the discharge parameter and the target mapping relationship, thereby reducing the SOC estimation error caused by changes in battery state, environmental factors, etc., and the corrected SOC value can more accurately reflect the remaining power of the battery, avoiding sudden shutdown or malfunction of the device due to inaccurate power estimation.

[0110] In some embodiments, before performing SOC correction, the end-of-discharge SOC correction method includes the following steps: S301 - S303 .

[0111] S301 . For each of a plurality of discharge parameters, discharge a target battery cell under each discharge parameter, and determine a discharge voltage corresponding to each of a plurality of SOC values ​​of the target battery cell during the discharge process.

[0112] The target battery cell is a battery cell of the same model as the target battery. The SOC value is less than the preset SOC threshold. The preset SOC threshold is the SOC threshold that triggers the target battery's end-of-discharge power limit. Optionally, the preset SOC threshold can be set according to actual needs. For example, the preset SOC threshold can be 10 or 5. This application does not impose specific restrictions on this.

[0113] In one possible implementation, there may be multiple target battery cells, and the data acquisition device may collect the discharge voltages corresponding to multiple SOC values ​​of the target battery cells during the discharge process of the multiple target battery cells under different discharge parameters in the low SOC range, and average the discharge voltages corresponding to the same SOC value of the multiple target battery cells to obtain the discharge voltages corresponding to the multiple SOC values ​​of the target battery cells.

[0114] S302: Establish an initial mapping relationship based on the discharge voltages corresponding to the plurality of SOC values.

[0115] In a possible implementation, the end-of-discharge SOC correction device may form an initial mapping relationship based on the discharge voltages corresponding to the multiple SOC values ​​and the multiple discharge parameters.

[0116] S303: If the fourth measured discharge voltage is greater than the preset voltage threshold, the initial mapping relationship is corrected based on the preset voltage threshold to obtain a target mapping relationship; if the fourth measured discharge voltage is less than or equal to the preset voltage threshold, the initial mapping relationship is determined as the target mapping relationship.

[0117] The fourth measured discharge voltage may be the maximum discharge voltage in the initial mapping relationship.

[0118] In a possible implementation, if the fourth measured discharge voltage is greater than a preset voltage threshold, the discharge end SOC correction device may correct the fourth measured discharge voltage to the preset voltage threshold. The discharge end SOC correction device may correct other measured discharge voltages except the fourth measured discharge voltage in the initial mapping relationship based on the difference between the fourth measured discharge voltage and the preset voltage threshold to obtain a target mapping relationship.

[0119] Specifically, the discharge end SOC correction device can determine the fourth measured discharge voltage, that is, the maximum discharge voltage in the initial mapping relationship. The discharge end SOC correction device can determine the difference between the fourth measured discharge voltage and the preset voltage threshold. The discharge end SOC correction device can correct the fourth measured discharge voltage to the preset voltage threshold, and based on the difference between the fourth measured discharge voltage and the preset voltage threshold, correct the other measured discharge voltages in the initial mapping relationship except the fourth measured discharge voltage, that is, the other measured discharge voltages except the fourth measured discharge voltage minus the difference between the fourth measured discharge voltage and the preset voltage threshold, to obtain the target mapping relationship.

[0120] Based on this, the present application can correct the maximum discharge voltage (the fourth measured discharge voltage) in the target mapping relationship to be close to the voltage trigger threshold (preset voltage threshold) of the discharge end power limit, and based on the difference between the fourth measured discharge voltage and the preset voltage threshold, correct the other discharge voltages in the initial mapping relationship except the fourth measured discharge voltage to obtain the target mapping relationship, so as to avoid the problem of SOC being incorrectly corrected when the target mapping relationship is used subsequently, resulting in a low SOC value.

[0121] Figure 4 FIG. 1 is a block diagram of a discharge end SOC correction device according to an exemplary embodiment. Figure 4 The end-of-discharge SOC correction device includes: an acquisition unit 401, a judgment unit 402, a correction unit 403 and a determination unit 404.

[0122] In a possible implementation, the acquisition unit 401 is used to acquire a first discharge parameter and a first SOC value of the target battery when the target battery is in operation.

[0123] In a possible implementation, the determination unit 402 is configured to determine whether the first discharge parameter satisfies a preset condition, where the preset condition is related to the first measured discharge parameter corresponding to the first measured SOC value.

[0124] In a possible implementation, the correction unit 403 is configured to correct the first SOC value based on the first measured SOC value when the first discharge parameter meets a preset condition and the first measured SOC value is less than the first SOC value.

[0125] In a possible implementation manner, the determination unit 404 is configured to determine a target sub-mapping relationship corresponding to the first discharge current from the target mapping relationship.

[0126] In a possible implementation, the determination unit 404 is further configured to determine the SOC value interval in which the first SOC value is located based on a magnitude relationship between the first SOC value and different measured SOC values.

[0127] In a possible implementation, the determination unit 404 is further configured to determine a first measured SOC value corresponding to the SOC value interval.

[0128] In a possible implementation manner, the determination unit 404 is further configured to determine the first measured voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature.

[0129] In a possible implementation, the determination unit 404 is specifically configured to: determine the second measured discharge voltage and the third measured discharge voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature when the first battery temperature is greater than the first temperature and less than the second temperature. Based on the first battery temperature, the measured temperature corresponding to the second measured discharge voltage, and the measured temperature corresponding to the third measured discharge voltage, interpolate the second measured discharge voltage and the third measured discharge voltage to obtain the first measured voltage.

[0130] In one possible implementation, the determination unit 404 is specifically used to: for each discharge parameter among the multiple discharge parameters, discharge the target battery cell under each discharge parameter, and determine the discharge voltage corresponding to each of the multiple SOC values ​​of the target battery cell during the discharge process. An initial mapping relationship is established based on the discharge voltages corresponding to each of the multiple SOC values. If the fourth measured discharge voltage is greater than a preset voltage threshold, the initial mapping relationship is corrected based on the preset voltage threshold to obtain a target mapping relationship. If the fourth measured discharge voltage is less than or equal to the preset voltage threshold, the initial mapping relationship is determined as the target mapping relationship.

[0131] In one possible implementation, the determination unit 404 is specifically configured to: correct the fourth measured discharge voltage to a preset voltage threshold, and based on the difference between the fourth measured discharge voltage and the preset voltage threshold, correct other measured discharge voltages in the initial mapping relationship except the fourth measured discharge voltage to obtain a target mapping relationship.

[0132] In a possible implementation, the correction unit 403 is specifically configured to: determine an SOC value correction rate based on a difference between the first measured SOC value and the first SOC value, and correct the first SOC value based on the SOC value correction rate.

[0133] 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.

[0134] Figure 5 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Figure 5 As shown, the electronic device includes but is not limited to: a processor 501 and a memory 502 .

[0135] The memory 502 is used to store executable instructions of the processor 501. It can be understood that the processor 501 is configured to execute instructions to implement the end-of-discharge SOC correction method in the above embodiment.

[0136] It should be noted that those skilled in the art can understand that Figure 5 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Figure 5 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0137] The processor 501 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 502, and calling data stored in the memory 502, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 501 may include one or more processing units. Optionally, the processor 501 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 501.

[0138] The memory 502 can be used to store software programs and various data. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can 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 502 can include a high-speed random access memory, and can 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.

[0139] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 502 including instructions. The above instructions can be executed by a processor 501 of an electronic device to implement the method in the above embodiment.

[0140] In actual implementation, Figure 4 The functions of the acquisition unit 401, the judgment unit 402, the correction unit 403 and the determination unit 404 in the embodiment can be realized by Figure 5 The processor 501 in the embodiment calls the computer program stored in the memory 502. The specific execution process can refer to the description of the method part in the above embodiment, which will not be repeated here.

[0141] 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.

[0142] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, and the one or more instructions can be executed by the processor 501 of the electronic device to complete the method in the above embodiment.

[0143] 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 processor of the electronic device, 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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 correcting SOC at the end of discharge, characterized in that: include: Acquire a first discharge parameter and a first SOC value when the target battery is working; Determine whether the first discharge parameter satisfies a preset condition, wherein the preset condition is related to the first measured discharge parameter corresponding to the first measured SOC value; wherein the first measured SOC and the first measured discharge parameter satisfy a target mapping relationship; the target mapping relationship includes: measured discharge parameters corresponding to a plurality of measured SOC values ​​one by one; the target mapping relationship is obtained after discharge measurement of a battery of the same model as the target battery; When the first discharge parameter meets the preset condition and the first measured SOC value is less than the first SOC value, the first SOC value is corrected based on the first measured SOC value.

2. The method according to claim 1, characterized in that: The first discharge parameter includes: a first discharge current, a first discharge voltage and a first battery temperature; the first measured discharge parameter includes: a first measured discharge current, a first measured discharge voltage and a first measured battery temperature; the preset condition includes: When the first battery temperature is equal to the first measured battery temperature, the first discharge current is less than or equal to the first measured discharge current, and a duration during which the first discharge voltage is less than or equal to the first measured discharge voltage exceeds a first duration threshold.

3. The method according to claim 2, characterized in that The target mapping relationship includes: a plurality of sub-mapping relationships corresponding to respective measured discharge currents; The sub-mapping relationship includes: measured discharge voltages corresponding to a plurality of measured SOC values ​​at different measured battery temperatures.

4. The method according to claim 3, characterized in that The measured discharge current is less than a preset current threshold; the preset current threshold is a current threshold that triggers the target battery discharge end power limitation; The measured discharge voltage is less than a preset voltage threshold; the preset voltage threshold is a voltage threshold that triggers the target battery discharge end power limitation.

5. The method according to any one of claims 1 to 4, characterized in that Before the step of determining whether the first discharge parameter meets a preset condition, the method includes: Determining a target sub-mapping relationship corresponding to the first discharge current from the target mapping relationship; Determining a SOC value interval in which the first SOC value is located based on a magnitude relationship between the first SOC value and different measured SOC values; Determining the first measured SOC value corresponding to the SOC value interval; The first measured voltage is determined from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature.

6. The method according to claim 5, characterized in that The determining the first measured voltage from the target sub-mapping relationship based on the first measured SOC value and the first battery temperature includes: In a case where the first battery temperature is greater than the first temperature and less than the second temperature, a second measured discharge voltage and a third measured discharge voltage are determined from a target sub-mapping relationship based on the first measured SOC value and the first battery temperature; the measured temperature corresponding to the second measured discharge voltage and the measured temperature corresponding to the third measured discharge voltage are both adjacent to the first battery temperature; the first temperature is the lowest temperature included in the target sub-mapping relationship; and the second temperature is the highest temperature included in the target sub-mapping relationship; Based on the first battery temperature, the measured temperature corresponding to the second measured discharge voltage, and the measured temperature corresponding to the third measured discharge voltage, the second measured discharge voltage and the third measured discharge voltage are interpolated to obtain the first measured voltage.

7. The method according to any one of claims 1 to 4, characterized in that The target mapping relationship is determined in the following manner: For each of the multiple discharge parameters, the target battery cell is discharged under each of the discharge parameters, and the discharge voltage corresponding to each of the multiple SOC values ​​of the target battery cell during the discharge process is determined; the target battery cell is a battery cell of the same model as the target battery; the SOC value is less than a preset SOC threshold; the preset SOC threshold is the SOC threshold that triggers the end-of-discharge power limit of the target battery; Establishing an initial mapping relationship based on the discharge voltages corresponding to the plurality of SOC values; If the fourth measured discharge voltage is greater than the preset voltage threshold, the initial mapping relationship is corrected based on the preset voltage threshold to obtain the target mapping relationship; if the fourth measured discharge voltage is less than or equal to the preset voltage threshold, the initial mapping relationship is determined as the target mapping relationship; the fourth measured discharge voltage is the maximum discharge voltage in the initial mapping relationship.

8. The method according to claim 7, characterized in that The modifying the initial mapping relationship based on the preset voltage threshold to obtain the target mapping relationship includes: Correcting the fourth measured discharge voltage to the preset voltage threshold; Based on the difference between the fourth measured discharge voltage and the preset voltage threshold, other measured discharge voltages except the fourth measured discharge voltage in the initial mapping relationship are corrected to obtain the target mapping relationship.

9. The method according to any one of claims 1 to 4, characterized in that: The correcting the first SOC value based on the first measured SOC value includes: Determining an SOC value correction rate based on a difference between the first measured SOC value and the first SOC value; the SOC value correction rate represents a time required for the first SOC value to jump by a preset step size; The first SOC value is corrected based on the SOC value correction rate.

10. A discharge end SOC correction device, characterized in that: The device comprises: an acquisition unit, a judgment unit and a correction unit; The acquisition unit is used to acquire a first discharge parameter and a first SOC value of the target battery when the target battery is working; The judgment unit is used to judge whether the first discharge parameter meets a preset condition, and the preset condition is related to the first measured discharge parameter corresponding to the first measured SOC value; wherein the first measured SOC and the first measured discharge parameter satisfy a target mapping relationship; the target mapping relationship includes: measured discharge parameters corresponding to multiple measured SOC values ​​one by one; the target mapping relationship is obtained after discharge measurement of a battery of the same model as the target battery; The correction unit is configured to correct the first SOC value based on the first measured SOC value when the first discharge parameter meets the preset condition and the first measured SOC value is less than the first SOC value.

11. A discharge end SOC correction system, characterized in that: The system comprises: a data acquisition device and a discharge end SOC correction device; The data acquisition device is used to obtain a first discharge parameter and a first SOC value of the target battery when it is working; The end-of-discharge SOC correction device is used to determine whether the first discharge parameter meets a preset condition, and the preset condition is related to the first measured discharge parameter corresponding to the first measured SOC value; wherein the first measured SOC and the first measured discharge parameter satisfy a target mapping relationship; the target mapping relationship includes: measured discharge parameters corresponding to multiple measured SOC values ​​one by one; the target mapping relationship is obtained after discharge measurement of a battery of the same model as the target battery; The end-of-discharge SOC correction device is used to correct the first SOC value based on the first measured SOC value when the first discharge parameter meets the preset condition and the first measured SOC value is less than the first SOC value.

12. A vehicle, characterized in that: The vehicle includes the end-of-discharge SOC correction system according to claim 11.

13. An electronic device, characterized in that: include: 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 9.

Images