Method and apparatus for determining, electronic device, vehicle and storage medium

Abstract

This application provides a method, apparatus, electronic device, vehicle, and storage medium for determining the state of charge (SCC). The method includes: after replacing the battery under test, determining in real time the internal resistance of the battery under test under current conditions and the comparison internal resistance, wherein the comparison internal resistance is the internal resistance value of the original battery under current conditions; if the internal resistance of the battery under test and the comparison internal resistance do not meet preset comparison requirements, acquiring the battery capacity of the battery under test, the target open-circuit voltage corresponding to the battery under test at full charge, and the remaining charge and discharge open-circuit voltage of the battery under test after discharge, wherein there are at least two sets of remaining charge and discharge open-circuit voltage; and determining the target function relationship between the state of charge and open-circuit voltage of the battery under test based on the battery capacity, target open-circuit voltage, remaining charge, and discharge open-circuit voltage. The method of this application improves the accuracy of detecting the state of charge of the battery under test.

Description

Technical Field

[0001] This application relates to the field of computer technology, and more particularly to a method, apparatus, electronic device, vehicle, and storage medium for determining [something]. Background Technology

[0002] The state of charge (SOC) of a lead-acid battery is directly proportional to its open circuit voltage (OCV). The functional relationship between SOC and OCV is typically determined by the battery manufacturer before shipment and stored in the battery management system (BMS). Therefore, during battery use, the SOC can be determined by detecting the OCV.

[0003] Currently, in existing battery management systems, after a battery is replaced, the state of charge (SOC) of the new battery is usually determined by the pre-stored functional relationship between the SOC and the open-circuit voltage of the battery before replacement.

[0004] However, due to the differences between each battery, the battery management system may be unable to accurately determine the state of charge of the replaced battery after replacement, which poses a certain risk when using the replaced battery and reduces its service life. Summary of the Invention

[0005] This application provides a method, apparatus, electronic device, vehicle, and storage medium for determining the state of charge of a battery after replacement, thereby addressing the problem that the state of charge of a battery after replacement may not be accurately determined.

[0006] Firstly, this application provides a method for determining this, comprising:

[0007] After replacing the battery under test, the internal resistance and comparison internal resistance of the battery under test under the current conditions are determined in real time, wherein the comparison internal resistance is the internal resistance value of the original battery under the current conditions.

[0008] If the internal resistance and comparison internal resistance do not meet the preset comparison requirements, then obtain the battery capacity of the battery under test, the target open circuit voltage of the battery under test when fully charged, and the remaining charge and discharge open circuit voltage of the battery under test after discharge. There are at least two sets of remaining charge and discharge open circuit voltage.

[0009] Based on the battery capacity, target open-circuit voltage, remaining charge, and discharge open-circuit voltage, determine the objective function relationship between the state of charge and open-circuit voltage of the battery under test.

[0010] In this application, after replacing the battery under test, the internal resistance and comparison internal resistance of the battery under test under the current conditions are determined in real time, including:

[0011] Determine the current conditions of the battery under test in real time;

[0012] Based on the current conditions, determine the internal resistance to be used, and select a matching internal resistance from the preset database that matches the current conditions.

[0013] In this application, current conditions include current temperature and battery properties;

[0014] Based on the current conditions, determine the internal resistance to be used, and select a matching internal resistance from a preset database, including:

[0015] Based on the battery properties, the internal resistance is obtained.

[0016] Based on the current temperature and battery properties, select a matching internal resistance from a preset database that matches the current conditions.

[0017] In this application, before determining the internal resistance of the battery under test and the comparison internal resistance under the current conditions in real time after replacing the battery under test, the method further includes:

[0018] After replacing the battery under test, determine the status of the battery under test;

[0019] If the state of the battery under test is the target state, then obtain the temperature, internal resistance and open circuit voltage of the battery under test when it is in the target state. The target state is the dormant state of the battery under test after charging.

[0020] The battery capacity and target open-circuit voltage of the battery under test are determined based on the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state.

[0021] In this application, if the state of the battery under test is the target state, the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state are obtained, including:

[0022] If the state of the battery under test is the target state, then obtain the first sleep time of the battery under test in the target state;

[0023] If the first sleep time meets the first preset time requirement, then the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state are determined.

[0024] In this application, after replacing the battery under test and determining the internal resistance and comparison internal resistance of the battery under test in real time under the current conditions, the method further includes:

[0025] If the internal resistance and the comparison internal resistance meet the preset comparison requirements, then the functional relationship between the battery capacity and the open circuit voltage of the original battery will be used as the target functional relationship, and the functional relationship between the battery capacity and the open circuit voltage of the original battery will be stored in the preset database.

[0026] In this application, if the internal resistance and comparison internal resistance do not meet the preset comparison requirements, the battery capacity of the battery under test, the target open-circuit voltage of the battery under test at full charge, and the remaining charge and discharge open-circuit voltage of the battery under test after discharge are obtained, including:

[0027] If the internal resistance and comparison internal resistance do not meet the preset comparison requirements, then obtain the battery capacity of the battery under test and the target open circuit voltage of the battery under test when it is fully charged.

[0028] Based on the battery capacity and the target open-circuit voltage corresponding to the battery under test when fully charged, obtain the cumulative discharge amount, cumulative charge amount and discharge open-circuit voltage of the battery under test after discharge.

[0029] The remaining charge of the battery under test after discharge is determined based on the cumulative discharge amount, cumulative charge amount, and discharge open-circuit voltage.

[0030] In this application, before obtaining the cumulative discharge amount, cumulative charge amount, and discharge open-circuit voltage of the battery under test after discharge, based on the battery capacity and the target open-circuit voltage corresponding to the battery under test at full charge, the method further includes:

[0031] Determine the second dormancy time after the battery under test is discharged;

[0032] If the second sleep time meets the second preset time requirement, then the steps of obtaining the cumulative discharge amount, cumulative charge amount and discharge open circuit voltage of the battery under test after discharge are executed.

[0033] Secondly, this application provides a determining device, comprising:

[0034] The real-time determination module is used to determine the internal resistance and comparison internal resistance of the battery under test under the current conditions after the battery under test is replaced. The comparison internal resistance is the internal resistance value of the original battery under the current conditions.

[0035] The acquisition module is used to acquire the battery capacity of the battery under test, the target open circuit voltage of the battery under test when it is fully charged, and the remaining charge and discharge open circuit voltage of the battery under test after discharge if the internal resistance and the comparison internal resistance do not meet the preset comparison requirements. The remaining charge and discharge open circuit voltage are at least two sets.

[0036] The determination module is used to determine the objective function relationship between the state of charge and open circuit voltage of the battery under test based on the battery capacity, target open circuit voltage, remaining charge, and discharge open circuit voltage.

[0037] Thirdly, this application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0038] The memory stores instructions that the computer executes;

[0039] The processor executes computer execution instructions stored in memory to implement the determination method of this application.

[0040] Fourthly, this application provides a vehicle that includes electronic devices.

[0041] Fifthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the determination method of this application.

[0042] This application provides a method, apparatus, electronic device, vehicle, and storage medium for determining the internal resistance of the battery under test in real time under current conditions after the battery is replaced. The comparison internal resistance is the internal resistance value of the original battery under current conditions. If the internal resistance and comparison internal resistance do not meet preset comparison requirements, the battery capacity, the target open-circuit voltage corresponding to the battery at full charge, and the remaining charge and discharge open-circuit voltage of the battery after discharge are obtained. There are at least two sets of remaining charge and discharge open-circuit voltage. Based on the battery capacity and target open-circuit voltage... The method of determining the state of charge (SOC) of a battery under test (BUT) and its target function relationship with its open-circuit voltage is based on internal resistance, remaining charge, and discharge open-circuit voltage. This can be achieved by comparing the internal resistance under current conditions to determine if the BUT matches the original battery. If the results indicate mismatch or the compared internal resistance does not meet preset comparison requirements, the data from the BUT during use can be reacquired to obtain the target function relationship between the SOC and open-circuit voltage. This allows the BUT to determine its charge state based on the target function relationship, thereby improving the accuracy of SOC detection. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0044] Figure 1 A flowchart illustrating the determination method provided in this application embodiment;

[0045] Figure 2 A flowchart illustrating another determination method provided in an embodiment of this application;

[0046] Figure 3 A schematic flowchart illustrating the method for obtaining the battery capacitance of a third-party battery provided in an embodiment of this application;

[0047] Figure 4 A schematic flowchart illustrating the method for obtaining the target open-circuit voltage provided in an embodiment of this application;

[0048] Figure 5 A flowchart illustrating the method for obtaining remaining power and corresponding open-circuit voltage provided in an embodiment of this application;

[0049] Figure 6 A schematic diagram of the determining device provided in the embodiments of this application;

[0050] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0051] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0052] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0053] In existing technologies, after replacing a vehicle's battery, if the battery is not the original, the BMS (Battery Management System) may be unable to accurately measure the battery, resulting in either an upper or lower bias effect. An upper bias effect occurs when the BMS calculates the battery capacity based on the original battery's SOC-OCV curve, which is higher than the actual capacity of the replaced battery. In this case, the vehicle system will assume the lead-acid battery is fully charged and stop charging, causing the battery to prematurely enter a sulfation state and reduce its actual effective capacity. A lower bias effect occurs when the BMS calculates the battery capacity based on the original battery's SOC-OCV curve, which is lower than the actual capacity of the replaced battery. In this case, the vehicle system will assume the lead-acid battery is depleted and needs charging, activating the charging system. However, since the battery is actually quite full and cannot be fully charged, the charging system is frequently activated, reducing the driving range of electric vehicles and the fuel economy of gasoline vehicles.

[0054] To address the aforementioned issues, this application provides a method for determining whether the battery under test is compatible with the original battery by comparing the internal resistance of the battery under test under current conditions with the internal resistance of the original battery under the same conditions. If the internal resistance under test and the internal resistance of the original battery do not meet the preset comparison requirements, then the battery under test is incompatible with the original battery. It is necessary to re-acquire the battery capacity of the battery under test, the target open-circuit voltage of the battery under test at full charge, and the remaining charge and discharge open-circuit voltage of the battery under test after discharge to determine the target function relationship between the state of charge and the open-circuit voltage of the battery under test. Thus, by using the newly determined target function relationship, the accuracy of the state of charge detection of the battery under test can be improved.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0056] The execution subject of the determination method provided in this application embodiment can be a server. The server can be a device such as an in-vehicle computer. This embodiment does not impose any particular limitation on the implementation method of the execution subject, as long as the execution subject can determine the internal resistance and comparison internal resistance of the battery under test in real time under the current conditions after replacing the battery under test, wherein the comparison internal resistance is the internal resistance value of the original battery under the current conditions; if the internal resistance and comparison internal resistance do not meet the preset comparison requirements, then the battery capacity of the battery under test, the target open-circuit voltage corresponding to the battery under test at full charge, and the remaining charge and discharge open-circuit voltage of the battery under test after discharge are obtained, wherein there are at least two sets of remaining charge and discharge open-circuit voltage; based on the battery capacity, target open-circuit voltage, remaining charge, and discharge open-circuit voltage, the objective function relationship between the state of charge and open-circuit voltage of the battery under test can be determined.

[0057] The battery management system (BMS) is a system that intelligently manages and maintains each battery cell, preventing overcharging and over-discharging, extending battery life, and monitoring battery status. The BMS includes a battery management module, a control module, a display module, a wireless communication module, and electrical equipment.

[0058] State of charge (SCC) is the ratio of a battery's remaining capacity after a period of use or long-term storage to its capacity when fully charged, and is usually expressed as a percentage.

[0059] Open-circuit voltage is the terminal voltage of a battery when it is in an open-circuit state.

[0060] The SOC-OCV curve can determine the open-circuit voltage of a battery under different states of charge. The remaining capacity of the battery can be determined using the SOC-OCV curve.

[0061] Figure 1 This is a flowchart illustrating the determination method provided in an embodiment of this application. The executing entity of this method can be a server or other servers; this embodiment does not impose any particular limitations. Figure 1 As shown, the method may include:

[0062] S101. After replacing the battery under test, determine the internal resistance and comparison internal resistance of the battery under test under the current conditions in real time. The comparison internal resistance is the internal resistance value of the original battery under the current conditions.

[0063] The battery under test can be a replaced battery in the battery management system that requires battery characteristic curve determination. This battery can be the same as the original battery or a non-original battery. The battery characteristic curve determination process refers to determining the SOC-OCV relationship curve of the battery under test. By determining the SOC-OCV relationship curve, the battery management system can accurately assess the state of charge of the battery under test. In this embodiment, the battery under test can be a lead-acid battery.

[0064] The current conditions can be the current temperature and battery properties of the battery under test during use. The current temperature characterizes the environment in which the battery is located, and the battery properties characterize the internal usage of the battery. In some embodiments, the battery properties may include the remaining charge, current, and voltage of the battery under test. The battery management system can detect and acquire the current temperature, current, and voltage of the battery under test through corresponding sensors. The remaining charge can be determined based on the SOC-OCV relationship curve of the original battery before replacement and the detected discharge amount of the battery under test. Therefore, the current conditions of the battery under test can be determined.

[0065] Internal resistance refers to the internal resistance value of the battery under test when it is in use. In the embodiments of this application, the internal resistance of the battery under test can be obtained by detecting the battery properties under the current conditions.

[0066] The comparison internal resistance can be a preset internal resistance under current conditions pre-stored in the battery management system. In some embodiments, the comparison internal resistance can be the internal resistance of the original battery before the battery under test is replaced, under current conditions. In this application embodiment, the relationship between the original battery's internal resistance and current temperature, remaining charge, current, and voltage can be pre-stored in the battery management system. Here, the current temperature, remaining charge, current, and voltage can all be range values. By determining the internal resistance corresponding to this range value, the comparison internal resistance can be determined. Here, "original battery" can refer to the original manufacturer's battery.

[0067] In this embodiment of the application, after the original battery of the new energy vehicle is replaced with the battery under test, the battery management system of the new energy vehicle can detect the current conditions of the battery under test in real time during the use of the battery under test, and determine the internal resistance and comparison internal resistance based on the current conditions.

[0068] In this embodiment of the application, the method for determining the internal resistance of the battery under test and comparing the internal resistance under current conditions in real time after replacing the battery under test may include:

[0069] Determine the current conditions of the battery under test in real time;

[0070] Based on the current conditions, determine the internal resistance to be used, and select a matching internal resistance from the preset database that matches the current conditions.

[0071] The preset database can be a database pre-installed in the battery management system. The database can store battery data for multiple different battery models. Each battery data can include the voltage and internal resistance corresponding to different states of charge at different temperatures.

[0072] In this embodiment of the application, the method for determining the internal resistance to be used based on the current conditions and selecting a matching internal resistance from a preset database may include:

[0073] Based on the battery properties, the internal resistance is obtained.

[0074] Based on the current temperature and battery properties, select a matching internal resistance from a preset database that matches the current conditions.

[0075] After obtaining the battery properties, the battery's internal resistance can be determined based on the voltage and current in the battery properties. Then, based on the current temperature and battery properties, a matching internal resistance that matches the current conditions can be selected from a preset database.

[0076] S102. If the internal resistance and comparison internal resistance do not meet the preset comparison requirements, then obtain the battery capacity of the battery under test, the target open circuit voltage of the battery under test when fully charged, and the remaining charge and discharge open circuit voltage of the battery under test after discharge. There are at least two sets of remaining charge and discharge open circuit voltage.

[0077] The preset comparison requirement can be a requirement for the error between the internal resistance used and the internal resistance compared. The preset comparison requirement can be used to determine whether the battery under test is an original battery. In this embodiment, the requirement for the error between the internal resistance used and the internal resistance compared can be a preset error range. For example, when the error range between the internal resistance used and the internal resistance compared is set to be less than 15%, when the error range between the internal resistance used and the internal resistance compared is greater than 15%, the internal resistance used and the internal resistance compared do not meet the preset comparison requirement.

[0078] Battery capacity is one of the important performance indicators for measuring battery performance, which can represent the amount of electricity released by the battery under certain conditions.

[0079] Full charge capacity refers to the capacitive energy of the battery under test when it is fully charged. Target open-circuit voltage can be the terminal voltage of the battery under test when it is fully charged and in an open-circuit state.

[0080] The remaining charge capacity refers to the remaining capacitive energy of the battery under test after use. The discharge open-circuit voltage refers to the terminal voltage of the battery under test in the open-circuit state after discharge. The remaining charge capacity corresponds to the discharge open-circuit voltage. For example, when the remaining charge capacity is 90%, the discharge open-circuit voltage represents the terminal voltage of 12.76V when the remaining charge capacity is 90%.

[0081] In this embodiment of the application, there need to be at least two sets of remaining charge and discharge open-circuit voltage. By using two or more sets of remaining charge and discharge open-circuit voltage, the relationship curve between the state of charge and the open-circuit voltage can be fitted. At the same time, as the number of sets increases, the accuracy of the relationship curve between the state of charge and the open-circuit voltage also increases.

[0082] In this embodiment of the application, the method for determining the internal resistance of the battery under test in real time under the current conditions and comparing the internal resistance before replacing the battery may further include:

[0083] After replacing the battery under test, determine the status of the battery under test;

[0084] If the state of the battery under test is the target state, then obtain the temperature, internal resistance and open circuit voltage of the battery under test when it is in the target state. The target state is the dormant state of the battery under test after charging.

[0085] The battery capacity and target open-circuit voltage of the battery under test are determined based on the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state.

[0086] The state of the battery under test can include the working state and the non-working state of the battery under test. The working state can include the charging state, the discharging state, and the dormant state after the charging state and the dormant state after the discharging state.

[0087] The target state can be the dormant state of the battery under test after charging. In this embodiment, after the battery under test is fully charged, the battery capacity and target open circuit voltage of the battery under test can be determined by acquiring the temperature, internal resistance and open circuit voltage of the battery under test when it is in the target state.

[0088] In this embodiment of the application, if the state of the battery under test is the target state, the method for obtaining the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state may include:

[0089] If the state of the battery under test is the target state, then obtain the first sleep time of the battery under test in the target state;

[0090] If the first sleep time meets the first preset time requirement, then the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state are determined.

[0091] The first sleep time refers to the time it takes for the battery to enter a sleep state. After the battery under test is charged, it may be affected by polarization voltage, which can lead to inaccurate testing. Sufficient sleep time can eliminate the influence of polarization voltage caused by charging.

[0092] The first preset time requirement can characterize the sleep time used to remove the planned voltage introduced by charging. In some embodiments, the first preset time requirement can be a pre-set time requirement, such as not less than 4 hours, meaning that the time the battery under test is in the target state after charging is not less than 4 hours. When the first sleep time meets the first preset time requirement, the temperature, internal resistance, and open-circuit voltage of the battery under test in the target state can be obtained, thereby determining the battery capacity and target open-circuit voltage of the battery under test. If the first sleep time does not meet the first preset time requirement, the data obtained can be discarded, and the first sleep time can be re-determined until the first sleep time meets the first preset time requirement.

[0093] In this embodiment of the application, the temperature, internal resistance and open circuit voltage of the battery under test when it is in the target state can be repeatedly obtained in multiple sets. By obtaining them multiple times, the battery capacity of the battery under test and the target open circuit voltage corresponding to the battery under test when it is fully charged can be determined more accurately.

[0094] In this embodiment of the application, the method for determining the internal resistance of the battery under test in real time under the current conditions and comparing the internal resistance after replacing the battery under test may further include:

[0095] If the internal resistance and the comparison internal resistance meet the preset comparison requirements, then the functional relationship between the battery capacity and the open circuit voltage of the original battery will be used as the target functional relationship, and the functional relationship between the battery capacity and the open circuit voltage of the original battery will be stored in the preset database.

[0096] If the internal resistance and the comparison internal resistance meet the preset comparison requirements, it indicates that the battery under test is an original battery. The SOC-OCV relationship curve stored in the battery management system matches the battery under test. Therefore, the functional relationship between the battery capacity and open circuit voltage of the original battery can be used as the functional relationship between the battery capacity and open circuit voltage of the battery under test.

[0097] In this embodiment of the application, if the internal resistance and the comparison internal resistance do not meet the preset comparison requirements, the method for obtaining the battery capacity of the battery under test, the target open-circuit voltage of the battery under test at full charge, and the remaining charge and discharge open-circuit voltage of the battery under test after discharge may include:

[0098] If the internal resistance and comparison internal resistance do not meet the preset comparison requirements, then obtain the battery capacity of the battery under test and the target open circuit voltage of the battery under test when it is fully charged.

[0099] Based on the battery capacity and the target open-circuit voltage corresponding to the battery under test when fully charged, obtain the cumulative discharge amount, cumulative charge amount and discharge open-circuit voltage of the battery under test after discharge.

[0100] The remaining charge of the battery under test after discharge is determined based on the cumulative discharge amount, cumulative charge amount, and discharge open-circuit voltage.

[0101] In this embodiment of the application, the method for obtaining the cumulative discharge amount, cumulative charge amount, and discharge open-circuit voltage of the battery under test after discharge, after determining the battery capacity and the target open-circuit voltage corresponding to the battery under test at full charge, may further include:

[0102] Determine the second dormancy time after the battery under test is discharged;

[0103] If the second sleep time meets the second preset time requirement, then the steps of obtaining the cumulative discharge amount, cumulative charge amount and discharge open circuit voltage of the battery under test after discharge are executed.

[0104] The second sleep time can be the sleep time after the battery under test has finished discharging. The second preset time requirement can be a requirement for the second sleep time. In this embodiment, the second preset time requirement can be a pre-set time requirement.

[0105] S103. Based on the battery capacity, target open-circuit voltage, remaining charge, and discharge open-circuit voltage, determine the objective function relationship between the state of charge and open-circuit voltage of the battery under test.

[0106] Among them, the objective function relationship between the state of charge (SOC) and open-circuit voltage of the battery under test can characterize the SOC-OCV relationship curve of the battery under test.

[0107] The determination method provided in this application embodiment determines the internal resistance and comparison internal resistance of the battery under test in real time under the current conditions after replacing the battery under test. The comparison internal resistance is the internal resistance value of the original battery under the current conditions. If the internal resistance and comparison internal resistance do not meet the preset comparison requirements, the battery capacity, the target open-circuit voltage corresponding to the battery under test at full charge, and the remaining charge and discharge open-circuit voltage of the battery under test after discharge are obtained. There are at least two sets of remaining charge and discharge open-circuit voltage. Based on the battery capacity, target open-circuit voltage, remaining charge, and... The discharge open-circuit voltage is a means of determining the target function relationship between the state of charge (SOC) and open-circuit voltage of a battery under test. It can be determined by comparing the internal resistance under the current conditions to see if the battery under test matches the original battery. If the results show that the internal resistance used to indicate mismatch or the comparison internal resistance does not meet the preset comparison requirements, the data of the battery under test during use can be reacquired to obtain the target function relationship between the SOC and open-circuit voltage. This allows the battery under test to determine its charge state based on the target function relationship, thereby improving the accuracy of the charge state detection of the battery under test.

[0108] Figure 2 This is a flowchart illustrating another determination method provided in an embodiment of this application. The execution entity of this method can be a server; however, this embodiment does not impose any particular limitation here. Figure 2 As shown, the method may include:

[0109] S201. Real-time acquisition of battery data from third-party batteries, including temperature, remaining charge, open-circuit voltage, and internal resistance.

[0110] Among them, aftermarket batteries are new batteries that replace the original batteries in a car.

[0111] Battery data such as temperature, remaining charge, open-circuit voltage, and current can be obtained through corresponding sensors, and the internal resistance can be calculated using the obtained data.

[0112] S202. Determine the internal resistance of the original battery based on the battery data.

[0113] After acquiring the battery data, the battery data can be compared with the data of existing original batteries in the battery management system to determine the internal resistance of the original battery corresponding to the temperature, remaining capacity, open circuit voltage, etc. in the battery data.

[0114] S203. Compare the internal resistance of the aftermarket battery with that of the original battery.

[0115] S204. When the error between the internal resistance of the aftermarket battery and the internal resistance of the original battery exceeds 15%, the battery capacitance of the aftermarket battery, the target open-circuit voltage when the target remaining charge is 100%, and the remaining charge and corresponding open-circuit voltage of the aftermarket battery after each discharge are obtained and calculated.

[0116] Specifically, the battery capacitance and target open-circuit voltage of the aftermarket battery at 100% remaining charge can be pre-acquired and stored after the aftermarket battery is charged. This ensures that if the error between the internal resistance of the aftermarket battery and the original battery exceeds 15%, the battery capacitance and target open-circuit voltage at 100% remaining charge can be obtained. The remaining charge and corresponding open-circuit voltage can be detected and acquired after each discharge of the aftermarket battery. After each acquisition of the remaining charge and corresponding open-circuit voltage, they can be stored as a coordinate point. After acquiring multiple coordinate points, the SOC-OCV relationship curve can be fitted to obtain the relationship between the remaining charge and the open-circuit voltage.

[0117] S205. Based on the battery capacitance, target open-circuit voltage, remaining capacity and open-circuit voltage, fit the SOC-OCV relationship curve of the aftermarket battery, and update the SOC-OCV relationship curve of the original battery stored in the battery management system according to the SOC-OCV relationship curve.

[0118] S206. When the error between the internal resistance of the aftermarket battery and the internal resistance of the original battery does not exceed 15%, the SOC-OCV relationship curve of the original battery stored in the battery management system shall be used as the SOC-OCV relationship curve of the aftermarket battery.

[0119] Figure 3 This is a flowchart illustrating a method for obtaining the battery capacitance of a third-party battery according to an embodiment of this application, as shown below. Figure 3 As shown, the method may include:

[0120] Determine whether the aftermarket battery meets the EOC (End Of Charge) state. Meeting the EOC (End Of Charge) state can be defined as having a charging voltage greater than 13.8V, a charging current less than 1A, and a duration greater than 10 minutes.

[0121] Once the EOC state is met, internal resistance calculation is initiated to obtain the battery data of the aftermarket battery. This battery data includes internal resistance. The internal resistance is saved to the EOC internal resistance queue, the discharge amount of the aftermarket battery is recorded, and it is determined whether the aftermarket battery is in a dormant state.

[0122] When the aftermarket battery enters sleep mode, the sleep time is recorded, and it is determined whether the aftermarket battery has been woken up. If the aftermarket battery wakes up, the voltage before wake-up is recorded, and it is determined whether the sleep time is greater than 8 hours. If the sleep time is less than 8 hours, the internal resistance record is invalid, and the internal resistance data is lost, returning to the EOC status determination. If the sleep time is greater than 8 hours, the discharge amount is saved to the queue as a valid record.

[0123] When there are more than 10 valid records, the internal resistance of each valid record is obtained, and a table lookup operation is performed based on the internal resistance to determine the battery capacity range of the aftermarket battery.

[0124] Figure 4 This is a flowchart illustrating the method for obtaining the target open-circuit voltage provided in an embodiment of this application, as shown below. Figure 4 As shown, the method may include:

[0125] Determine if the aftermarket battery meets the EOC (Effective Opening) condition. If it meets the EOC condition, and the maximum charging current is less than 10A and the cumulative charging capacity is less than 5Ah, then the cumulative discharge capacity is considered. If it meets the EOC condition, and the maximum charging current is greater than 10A and the cumulative charging capacity is greater than 5Ah, then the data is invalid.

[0126] Once the cumulative discharge exceeds 1Ah, the data is reset to zero. If the cumulative discharge is less than 1Ah, it is determined whether the aftermarket battery is in sleep mode. When the aftermarket battery is in sleep mode, the sleep time is recorded, and it is determined whether the aftermarket battery is woken up. If the aftermarket battery is woken up, the voltage before wake-up is recorded, and it is determined whether the sleep time is greater than 8 hours. If the sleep time is less than 8 hours, the record is invalid, the data is reset to zero, and the system returns to the EOC status check. If the sleep time is greater than 8 hours, the target open-circuit voltage when the target remaining charge is 100% is recorded.

[0127] Figure 5 This is a flowchart illustrating the method for obtaining remaining battery power and corresponding open-circuit voltage provided in an embodiment of this application. Figure 5 As shown, the method may include:

[0128] Determine if the aftermarket battery meets the EOC (Effective Opening) condition. If it does, determine whether to discharge it. After discharging, record the cumulative discharge amount and determine if the aftermarket battery is in a dormant state. If the aftermarket battery is in a dormant state, determine the discharge amount. If the discharge amount is less than 5Ah, clear the data and return to the step of determining if the aftermarket battery meets the EOC condition. If the discharge amount is greater than 5Ah, record the dormant time and determine if the aftermarket battery should be woken up. After the aftermarket battery is woken up, determine if the dormant time is greater than 8 hours. If the dormant time is less than 8 hours, clear the data and return to the step of determining if the aftermarket battery meets the EOC condition. If the dormant time is greater than 8 hours, record the voltage value before waking up.

[0129] If the aftermarket battery is not in sleep mode, determine whether to charge. If not, return to the step of recording the cumulative discharge capacity. If charging, record the cumulative charge capacity. If the charge amount is greater than the discharge amount, clear the data for this single transaction and return to the step of determining whether the aftermarket battery meets the EOC (Electronic Open Cap) condition. If the charge amount is less than the discharge amount, determine whether the aftermarket battery is in sleep mode. If not in sleep mode, determine whether to discharge. If not discharging, return to the step of determining whether to charge. If discharging, return to the step of recording the cumulative discharge capacity. If in sleep mode, when discharge amount - charge amount > 5Ah, return to the step of recording sleep time. When discharge amount - charge amount < 5Ah, clear the data for this single transaction and return to the step of determining whether the aftermarket battery meets the EOC condition.

[0130] The alternative determination method provided in this application embodiment can detect both original and aftermarket batteries, estimate the capacity of aftermarket batteries by combining internal resistance and temperature, address the starting point problem of the OCV algorithm through the EOC function, and capture effective SOC-OCV curve points by monitoring vehicle behavior, including voltage, current, running time, cumulative charge and discharge capacity, and vehicle status. The method then fits the effective SOC-OCV curve points to derive the aftermarket SOC-OCV curve. This solves the problem of upper and lower deviations in BMS monitoring caused by the position of the aftermarket battery's SOC-OCV curve, and provides a solution for obtaining the SOC-OCV curve in actual vehicle use.

[0131] Figure 6 This is a schematic diagram of the determining device provided in an embodiment of this application. Figure 6 As shown, the determining device 60 includes: a real-time determining module 601, an acquisition module 602, and a determining module 603. Wherein:

[0132] The real-time determination module 601 is used to determine the internal resistance and comparison internal resistance of the battery under test under the current conditions in real time after the battery under test is replaced. The comparison internal resistance is the internal resistance value of the original battery under the current conditions.

[0133] The acquisition module 602 is used to acquire the battery capacity of the battery under test, the target open circuit voltage of the battery under test when it is fully charged, and the remaining charge and discharge open circuit voltage of the battery under test after discharge if the internal resistance and the comparison internal resistance do not meet the preset comparison requirements. The remaining charge and discharge open circuit voltage are at least two sets.

[0134] The determination module 603 is used to determine the objective function relationship between the state of charge and the open circuit voltage of the battery under test based on the battery capacity, target open circuit voltage, remaining charge capacity, and discharge open circuit voltage.

[0135] In this embodiment of the application, the real-time determination module 601 can also be specifically used for:

[0136] Determine the current conditions of the battery under test in real time;

[0137] Based on the current conditions, determine the internal resistance to be used, and select a matching internal resistance from the preset database that matches the current conditions.

[0138] In this embodiment of the application, the real-time determination module 601 can also be specifically used for:

[0139] Based on the battery properties, the internal resistance is obtained.

[0140] Based on the current temperature and battery properties, select a matching internal resistance from a preset database that matches the current conditions.

[0141] In this embodiment of the application, the real-time determination module 601 can also be specifically used for:

[0142] After replacing the battery under test, determine the status of the battery under test;

[0143] If the state of the battery under test is the target state, then obtain the temperature, internal resistance and open circuit voltage of the battery under test when it is in the target state. The target state is the dormant state of the battery under test after charging.

[0144] The battery capacity and target open-circuit voltage of the battery under test are determined based on the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state.

[0145] In this embodiment of the application, the real-time determination module 601 can also be specifically used for:

[0146] If the state of the battery under test is the target state, then obtain the first sleep time of the battery under test in the target state;

[0147] If the first sleep time meets the first preset time requirement, then the temperature, internal resistance, and open-circuit voltage of the battery under test when it is in the target state are determined.

[0148] In this embodiment of the application, the real-time determination module 601 can also be specifically used for:

[0149] If the internal resistance and the comparison internal resistance meet the preset comparison requirements, then the functional relationship between the battery capacity and the open circuit voltage of the original battery will be used as the target functional relationship, and the functional relationship between the battery capacity and the open circuit voltage of the original battery will be stored in the preset database.

[0150] In this embodiment of the application, the acquisition module 602 can also be specifically used for:

[0151] If the internal resistance and comparison internal resistance do not meet the preset comparison requirements, then obtain the battery capacity of the battery under test and the target open circuit voltage of the battery under test when it is fully charged.

[0152] Based on the battery capacity and the target open-circuit voltage corresponding to the battery under test when fully charged, obtain the cumulative discharge amount, cumulative charge amount and discharge open-circuit voltage of the battery under test after discharge.

[0153] The remaining charge of the battery under test after discharge is determined based on the cumulative discharge amount, cumulative charge amount, and discharge open-circuit voltage.

[0154] In this embodiment of the application, the acquisition module 602 can also be specifically used for:

[0155] Determine the second dormancy time after the battery under test is discharged;

[0156] If the second sleep time meets the second preset time requirement, then the steps of obtaining the cumulative discharge amount, cumulative charge amount and discharge open circuit voltage of the battery under test after discharge are executed.

[0157] As described above, the determining device 60 of this application comprises a real-time determining module 601, used to determine the internal resistance and comparison internal resistance of the battery under test under current conditions after the battery under test is replaced, wherein the comparison internal resistance is the internal resistance value of the original battery under current conditions; an acquisition module 602, used to acquire the battery capacity, the target open-circuit voltage corresponding to the battery under test when fully charged, and the remaining charge and discharge open-circuit voltage of the battery under test after discharge, wherein there are at least two sets of remaining charge and discharge open-circuit voltage; and a determining module 603, used to determine the target function relationship between the state of charge and open-circuit voltage of the battery under test based on the battery capacity, target open-circuit voltage, remaining charge, and discharge open-circuit voltage. Thus, the state of charge of the battery under test can be determined according to the target function relationship, thereby improving the accuracy of the state of charge detection of the battery under test.

[0158] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 7 As shown, the electronic device 70 includes:

[0159] The electronic device 70 may include a processor 701 with one or more processing cores, a memory 702 with one or more computer-readable storage media, a communication component 703, and other components. The processor 701, memory 702, and communication component 703 are connected via a bus 704.

[0160] In the specific implementation process, at least one processor 701 executes computer execution instructions stored in memory 702, causing at least one processor 701 to perform the determination method as described above.

[0161] The specific implementation process of processor 701 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0162] In the above Figure 7 In the illustrated embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0163] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0164] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0165] In some embodiments, a computer program product is also provided, comprising a computer program or instructions that, when executed by a processor, implement the steps in any of the determination methods described above.

[0166] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0167] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0168] Therefore, embodiments of this application provide a computer-readable storage medium storing a plurality of instructions that can be loaded by a processor to execute the steps in any of the determining methods provided in embodiments of this application.

[0169] The storage medium may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0170] According to one aspect of this application, a computer program product or computer program is provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium.

[0171] Since the instructions stored in the storage medium can execute the steps in any of the determination methods provided in the embodiments of this application, the beneficial effects that any of the determination methods provided in the embodiments of this application can achieve can be realized. For details, please refer to the previous embodiments, which will not be repeated here.

[0172] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0173] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A determination method characterized by, The method is applied to a battery management system, and comprises the following steps: After replacing a battery to be tested, real-time determination is made of a use internal resistance and a comparison internal resistance of the battery to be tested under current conditions, wherein the comparison internal resistance is an internal resistance value of an original battery under the current conditions; If the use internal resistance and the comparison internal resistance do not meet preset comparison requirements, a battery capacity of the battery to be tested, and a target open-circuit voltage corresponding to the battery to be tested under full charge are obtained; According to the battery capacity and the target open-circuit voltage corresponding to the battery to be tested under full charge, a second sleep time after discharging of the battery to be tested is determined; If the second sleep time meets second preset time requirements, a step of obtaining cumulative discharge capacity, cumulative charge capacity and discharge open-circuit voltage after discharging of the battery to be tested is performed; The cumulative discharge capacity, the cumulative charge capacity and the discharge open-circuit voltage after discharging of the battery to be tested are obtained; According to the cumulative discharge capacity, the cumulative charge capacity and the discharge open-circuit voltage, a remaining charge capacity of the battery to be tested after discharging is determined, wherein the remaining charge capacity and the discharge open-circuit voltage are at least two groups; According to the battery capacity, the target open-circuit voltage, the remaining charge capacity and the discharge open-circuit voltage, a target function relationship between a state of charge and an open-circuit voltage of the battery to be tested is determined.

2. The method of claim 1, wherein, The real-time determination of the use internal resistance and the comparison internal resistance of the battery to be tested under the current conditions after replacing the battery to be tested comprises the following steps: Real-time determination is made of current conditions of the battery to be tested; According to the current conditions, the use internal resistance is determined, and a comparison internal resistance matching the current conditions is selected from a preset database.

3. The method of claim 2, wherein, The current conditions comprise a current temperature and a battery attribute; According to the current conditions, the use internal resistance is determined, and a comparison internal resistance matching the current conditions is selected from a preset database, which comprises the following steps: According to the battery attribute, the use internal resistance is obtained; According to the current temperature and the battery attribute, a comparison internal resistance matching the current conditions is selected from a preset database.

4. The method of claim 1, wherein, Before the real-time determination of the use internal resistance and the comparison internal resistance of the battery to be tested under the current conditions after replacing the battery to be tested, the method further comprises the following steps: After replacing the battery to be tested, a state of the battery to be tested is determined; If the state of the battery to be tested is a target state, a temperature, an internal resistance and an open-circuit voltage of the battery to be tested in the target state are obtained, and the target state is a sleep state after charging of the battery to be tested; According to the temperature, the internal resistance and the open-circuit voltage of the battery to be tested in the target state, the battery capacity and the target open-circuit voltage of the battery to be tested are determined.

5. The method of claim 4, wherein, If the state of the battery to be tested is the target state, the temperature, the internal resistance and the open-circuit voltage of the battery to be tested in the target state are obtained, which comprises the following steps: If the state of the battery to be tested is a target state, a first sleep time of the battery to be tested in the target state is obtained; If the first sleep time meets first preset time requirements, the temperature, the internal resistance and the open-circuit voltage of the battery to be tested in the target state are determined.

6. The method of claim 1, wherein, After the battery to be tested is replaced, the real-time use internal resistance and the comparison internal resistance of the battery to be tested under current conditions are determined, and the method further comprises: If the use internal resistance and the comparison internal resistance meet preset comparison requirements, a function relationship between a battery capacity and an open circuit voltage of an original battery is taken as the target function relationship, and the function relationship between the battery capacity and the open circuit voltage of the original battery is stored in a preset database.

7. A determination device, characterized in that Comprise: A real-time determination module is configured to determine, in real time, a use internal resistance and a comparison internal resistance of the battery to be tested under current conditions after the battery to be tested is replaced, wherein the comparison internal resistance is an internal resistance value of an original battery under current conditions. An acquisition module is configured to acquire, if the use internal resistance and the comparison internal resistance do not meet preset comparison requirements, a battery capacity of the battery to be tested, a target open circuit voltage corresponding to the battery to be tested at full charge capacity, determine a second sleep time of the battery to be tested after discharge according to the battery capacity and the target open circuit voltage corresponding to the battery to be tested at full charge capacity, and execute the steps of acquiring cumulative discharge capacity, cumulative charge capacity, and discharge open circuit voltage of the battery to be tested after discharge if the second sleep time meets second preset time requirements. The acquisition module is further configured to acquire the cumulative discharge capacity, the cumulative charge capacity, and the discharge open circuit voltage of the battery to be tested after discharge, and determine a remaining charge capacity of the battery to be tested after discharge according to the cumulative discharge capacity, the cumulative charge capacity, and the discharge open circuit voltage, wherein the remaining charge capacity and the discharge open circuit voltage are at least two groups.

8. An electronic device, comprising: A determination module is configured to determine a state of charge and a target function relationship between an open circuit voltage of the battery to be tested according to the battery capacity, the target open circuit voltage, the remaining charge capacity, and the discharge open circuit voltage. Comprise: A processor and a memory connected in communication with the processor; The memory stores computer execution instructions; 9. A vehicle characterized by comprising: The processor executes the computer execution instructions stored in the memory to implement the determination method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The vehicle comprises the electronic device according to claim 8. The computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by the processor to implement the determination method according to any one of claims 1 to 6. The computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by the processor to implement the determination method according to any one of claims 1 to 6.

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