Vehicle battery power determination method and device, storage medium and electronic equipment

Abstract

The invention discloses a vehicle battery power determination method and device, a storage medium and electronic equipment. The method comprises the steps that under the condition that operation data of a vehicle meets a preset operation condition, direct-current internal resistance calibration is conducted on a battery of the vehicle under N sets of parameter values of a first battery performance parameter set, and first direct-current internal resistance corresponding to each set of parameter values is obtained; determining second direct-current internal resistances respectively corresponding to the N groups of parameter values from a preset initial direct-current internal resistance table; determining a target power table according to the numerical relationship between the first direct-current internal resistance and the second direct-current internal resistance corresponding to the N groups of parameter values and the initial power table; and when the vehicle runs, according to the target power table and the current battery performance of the battery, determining the currently allowed target maximum power of the battery. According to the invention, the technical problem of low accuracy of determining the battery power of the vehicle in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a method, device, storage medium and electronic device for determining battery power of a vehicle. Background Art

[0002] In the field of electric vehicles, batteries are core energy storage units, and their performance directly affects the operating efficiency and safety of vehicles. Therefore, the power evaluation of vehicle batteries is a very important task. At present, in the early stage of use, vehicle batteries often only have battery power information at the beginning of life (BOL) state. The power information of aged batteries is usually considered to remain unchanged or change with the battery health state (SOH).

[0003] However, as the vehicle is used and the battery system ages, the performance of the battery may be affected by many factors. It will not remain unchanged or only change with the battery health status. Therefore, the battery power information determined in the relevant technology cannot accurately reflect the actual power of the battery during the aging process, which may easily cause insufficient power or trigger an alarm in the entire vehicle, resulting in poor owner experience, many complaints, and other problems.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] Embodiments of the present invention provide a method, device, storage medium and electronic device for determining the battery power of a vehicle, so as to at least solve the technical problem of low accuracy in determining the battery power of a vehicle in the related art.

[0006] According to one aspect of an embodiment of the present invention, a method for determining the battery power of a vehicle is provided, comprising: when the operating data of the vehicle meets preset operating conditions, performing DC internal resistance calibration on the battery of the vehicle under N groups of parameter values ​​of a first battery performance parameter set to obtain a first DC internal resistance corresponding to each group of parameter values; determining second DC internal resistances corresponding to the N groups of parameter values ​​from a preset initial DC internal resistance table, wherein the initial DC internal resistance table is used to represent the DC internal resistances corresponding to the battery under different groups of parameter values ​​of the first battery performance parameter set; determining a target power table based on a numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table, wherein the initial power table is used to represent the initial maximum power corresponding to the battery under different groups of parameter values ​​of the second battery performance parameter set; while the vehicle is running, determining the target maximum power currently allowed for the battery based on the target power table and the current battery performance of the battery.

[0007] Furthermore, the method for determining the battery power of a vehicle also includes: for each set of parameter values ​​in the N sets of parameter values, determining whether a first DC internal resistance corresponding to the set of parameter values ​​is less than or equal to a second DC internal resistance corresponding to the set of parameter values, and obtaining a judgment result; if the judgment results of the N sets of parameter values ​​all indicate that the first DC internal resistance is less than or equal to the second DC internal resistance, determining the initial power table as the target power table; if there is a judgment result indicating that the first DC internal resistance is greater than the second DC internal resistance, determining the target power table based on the first DC internal resistance and the initial power table.

[0008] Furthermore, the method for determining the battery power of the vehicle also includes: determining a target DC internal resistance table based on a first DC internal resistance corresponding to N groups of parameter values; determining a ratio between DC internal resistances corresponding to the same group of parameter values ​​in the initial DC internal resistance table and the target DC internal resistance table to obtain a target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table; and updating the initial power table based on the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table to obtain a target power table.

[0009] Furthermore, the first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration, wherein the method for determining the battery power of the vehicle also includes: determining a first DC internal resistance table based on the first DC internal resistance corresponding to N groups of parameter values, wherein the first DC internal resistance table includes at least N groups of parameter values ​​and the first DC internal resistance corresponding to the N groups of parameter values; determining the missing temperature values ​​and the missing battery state of charge values ​​of the first DC internal resistance table relative to the initial DC internal resistance table; based on the interpolation method, the DC internal resistance corresponding to the battery in the first DC internal resistance table at the missing temperature values ​​and the missing battery state of charge values ​​is supplemented according to the data in the first DC internal resistance table to obtain a target DC internal resistance table.

[0010] Furthermore, the first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration, wherein the method for determining the battery power of the vehicle further includes: for each group of parameter values ​​in the initial DC internal resistance table, determining whether the target DC internal resistance table includes the group of parameter values; when the target DC internal resistance table includes the group of parameter values, if the DC internal resistance of the group of parameter values ​​in the target DC internal resistance table is greater than the DC internal resistance of the group of parameter values ​​in the initial DC internal resistance table, then calculating the ratio between the DC internal resistances corresponding to the group of parameter values ​​in the target DC internal resistance table and the initial DC resistance table, and obtaining the DC internal resistance corresponding to the group of parameter values. a target ratio; if the target DC internal resistance table does not include the group of parameter values, determining the target parameter value group from the target DC internal resistance table, wherein the target parameter value group has the same temperature value and battery state of charge value as the group of parameter values, but different charge and discharge rate value and / or maximum power charge and discharge duration value; if the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table is greater than the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table, then calculating the ratio between the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table and the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table to obtain the target ratio corresponding to the group of parameter values.

[0011] Furthermore, the method for determining the battery power of a vehicle also includes: determining M groups of parameter values ​​corresponding to a first battery performance parameter set, wherein there are no identical groups of parameter values ​​between the M groups of parameter values ​​and the N groups of parameter values; calibrating the DC internal resistance of the battery of the vehicle based on the M groups of parameter values ​​to obtain a first DC internal resistance corresponding to each group of parameter values ​​in the M groups of parameter values; and determining a first DC internal resistance table based on the first DC internal resistance corresponding to the N groups of parameter values ​​and the first DC internal resistance corresponding to the M groups of parameter values.

[0012] Further, the first battery performance parameter set includes a second battery performance parameter set, wherein the method for determining the battery power of the vehicle also includes: for each group of parameter values ​​in the initial power table, determining whether there is a target ratio corresponding to the group of parameter values ​​in at least one group of target ratios corresponding to the parameter value set; if there is a target ratio corresponding to the group of parameter values, calculating the ratio between the initial maximum power corresponding to the group of parameter values ​​in the initial power table and the target ratio corresponding to the group of parameter values, to obtain the target maximum power corresponding to the group of parameter values; and updating the initial power table according to the target maximum power corresponding to the parameter value group in the initial power table to obtain the target power table.

[0013] Furthermore, the method for determining the battery power of a vehicle also includes: before calibrating the DC internal resistance of the battery of the vehicle under N groups of parameter values ​​of a first battery performance parameter set, counting the mileage of the vehicle, determining the mileage as operating data, and judging whether the operating data meets preset operating conditions, or counting the duration between a target time point and a time point when a user first uses the vehicle, determining the duration as operating data, and judging whether the operating data meets preset operating conditions.

[0014] According to another aspect of an embodiment of the present invention, a device for determining the battery power of a vehicle is also provided, comprising: a processing module, for calibrating the DC internal resistance of the battery of the vehicle under N groups of parameter values ​​of a first battery performance parameter set when the operating data of the vehicle meets preset operating conditions, and obtaining the first DC internal resistance corresponding to each group of parameter values; a first determination module, for determining the second DC internal resistance corresponding to the N groups of parameter values ​​from a preset initial DC internal resistance table, wherein the initial DC internal resistance table is used to represent the DC internal resistance corresponding to the battery under different groups of parameter values ​​of the first battery performance parameter set; a second determination module, for determining a target power table based on the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table, wherein the initial power table is used to represent the initial maximum power corresponding to the battery under different groups of parameter values ​​of the second battery performance parameter set; a third determination module, for determining the target maximum power currently allowed for the battery based on the target power table and the current battery performance of the battery when the vehicle is running.

[0015] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the above-mentioned method for determining the battery power of a vehicle when running.

[0016] According to another aspect of an embodiment of the present invention, an electronic device is also provided, which includes one or more processors; a memory for storing one or more programs, which, when the one or more programs are executed by the one or more processors, enables the one or more processors to run the programs, wherein the programs are configured to execute the above-mentioned method for determining the battery power of the vehicle when running.

[0017] In an embodiment of the present invention, the power information of the vehicle is determined according to the difference information between the DC internal resistance before and after the vehicle is used. When the operation data of the vehicle meets the preset operation conditions, the DC internal resistance of the battery of the vehicle is calibrated under N groups of parameter values ​​of the first battery performance parameter set to obtain the first DC internal resistance corresponding to each group of parameter values, and then the second DC internal resistance corresponding to the N groups of parameter values ​​is determined from the preset initial DC internal resistance table, and then the target power table is determined according to the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table, so that when the vehicle is running, the target maximum power currently allowed by the battery is determined according to the target power table and the current battery performance of the battery. Among them, the initial DC internal resistance table is used to indicate the DC internal resistance corresponding to the battery under different groups of parameter values ​​of the first battery performance parameter set, and the initial power table is used to indicate the initial maximum power corresponding to the battery under different groups of parameter values ​​of the second battery performance parameter set.

[0018] In the above process, when the vehicle's operating data meets the preset operating conditions, the DC internal resistance of the vehicle battery is calibrated under N groups of parameter values ​​to obtain the first DC internal resistance corresponding to each group of parameter values, thereby realizing the determination of the DC internal resistance of the vehicle battery under various performances after aging. Since there is a close relationship between the DC internal resistance of the battery and its maximum power input and output capabilities, by determining the second DC internal resistance corresponding to the N groups of parameter values ​​from the preset initial DC internal resistance table, and determining the target power table according to the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table, it is possible to determine the change in battery power according to the difference information between the DC internal resistance of the vehicle battery before aging and the DC internal resistance of the vehicle battery after aging under different performances, thereby realizing the determination of an accurate target power table, and then when the vehicle is running, the target maximum power currently allowed for the battery is determined according to the target power table and the current battery performance of the battery, which can effectively improve the accuracy of the determined battery power.

[0019] It can be seen that the solution provided in the present application achieves the purpose of determining the power information of the vehicle based on the difference information between the DC internal resistance before and after the vehicle is used, thereby achieving the technical effect of improving the accuracy of the determined battery power, and further solving the technical problem of low accuracy in determining the battery power of the vehicle in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1The following is a flow chart of an optional method for determining the battery power of a vehicle according to an embodiment of the present invention. Figure 1 ;

[0022] Figure 2 The following is a flow chart of an optional method for determining the battery power of a vehicle according to an embodiment of the present invention. Figure 2 ;

[0023] Figure 3 is a schematic diagram of an optional device for determining battery power of a vehicle according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of an optional electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards in the relevant regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0028] Example 1

[0029] According to an embodiment of the present invention, an embodiment of a method for determining the battery power of a vehicle is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0030] Figure 1 The following is a flow chart of an optional method for determining the battery power of a vehicle according to an embodiment of the present invention. Figure 1 ,like Figure 1 As shown, the method comprises the following steps:

[0031] Step S101, when the operation data of the vehicle meets the preset operation conditions, the DC internal resistance of the battery of the vehicle is calibrated under N groups of parameter values ​​of the first battery performance parameter set to obtain the first DC internal resistance corresponding to each group of parameter values.

[0032] Optionally, electronic devices, application systems, servers and other devices can be used as execution subjects. In this embodiment, the target processing system is used as the execution subject to execute the method for determining the battery power of the vehicle. In some embodiments, the vehicle is an electric vehicle or a hybrid vehicle. The vehicle can be a car, an electric car, a motorcycle or other vehicle powered by a battery.

[0033] During vehicle driving, battery power evaluation is very important. If the discharge power is underestimated, the vehicle may not provide enough power for acceleration or climbing, affecting driving performance. If the discharge power is overestimated, it may cause over-discharge of the battery, thereby accelerating battery aging or even damaging the battery. If the charging power is overestimated, it may lead to energy waste during the charging process and increase operating costs. Therefore, when the vehicle is running, it is necessary to determine the maximum charging power and maximum discharge power of the battery at different SOC (State of Charge), different temperatures, and different charging and discharging times, so as to be as close as possible to the maximum real capacity of the battery in the actual operation stage, and avoid improper use of the battery, resulting in problems such as insufficient power or triggering alarms.

[0034] In some embodiments, before the vehicle leaves the factory, an initial DC internal resistance table and an initial power table may be stored in the vehicle's BMS (Battery Management System), wherein the initial DC internal resistance table may be understood as a DC internal resistance table of the battery in the BOL state, and the initial power table may be understood as a power table of the battery in the BOL state.

[0035] In some embodiments, the initial DC internal resistance table is used to represent the DC internal resistance (DCR) corresponding to the battery under different sets of parameter values ​​of the first battery performance parameter set. The first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration, that is, the initial DC internal resistance table can also be understood as a "temperature-SOC-rate-time-DCR table". The initial DC internal resistance table is used to represent the DC internal resistance corresponding to the battery under different temperatures, different battery states of charge, different charge and discharge rates, and different maximum power charge and discharge durations.

[0036] In some embodiments, the initial power table is used to indicate the initial maximum power corresponding to the battery under different sets of parameter values ​​of the second battery performance parameter set. The initial maximum power is the initial maximum discharge power or the initial maximum charge power. The second battery performance parameter set includes temperature, battery state of charge, and maximum power charge and discharge duration. That is, the initial power table can also be understood as a "temperature-SOC-time-maximum power P table". The initial power table is used to indicate the initial maximum power of the battery under different temperatures, different battery states of charge, and different maximum power charge and discharge durations.

[0037] In some embodiments, the parameter values ​​of the temperature in the initial DC internal resistance table and the initial power table cover all operating temperatures of the battery, such as -30 to 60°C, and the parameter value of the SOC can be taken at intervals of 5% SOC within the range of 0 to 100% SOC, such as 5% SOC, 10% SOC, etc. In the case where the parameter is the charge and discharge rate, the charge and discharge rate includes the rated charge rate, the rated discharge rate, the maximum continuous charge rate, and the maximum continuous discharge rate, and the parameter is one of the rated charge rate, the rated discharge rate, the maximum continuous charge rate, and the maximum continuous discharge rate. The parameter values ​​of the rated charge rate and the rated discharge rate can be 0.33C, 0.5C, or 1C, etc., and the parameter values ​​of the maximum continuous charge rate and the maximum continuous discharge rate can be 1C, 2C, or 3C, etc. When the parameter is the maximum power charge and discharge duration, the maximum power charge and discharge duration includes the maximum power charging duration and the maximum power discharging duration, and the parameter is one of the maximum power discharging duration and the maximum power charging duration, and the parameter values ​​of the maximum power charging duration and the maximum power discharging duration can be 2s, 10s, 30s, 60s, etc.

[0038] Optionally, the initial DC internal resistance table may simultaneously contain a first battery performance parameter set including a rated charge rate, a first battery performance parameter set including a rated discharge rate, a first battery performance parameter set including a maximum continuous charge rate, and a first battery performance parameter set including a maximum continuous discharge rate, and may simultaneously contain a first battery performance parameter set including a maximum continuous charge rate and a first battery performance parameter set including a maximum continuous discharge rate. A set of parameter values ​​of the first battery performance parameter set consists of a parameter value corresponding to each parameter in the first battery performance parameter set.

[0039] For example, a set of parameter values ​​of the first battery performance parameter set may be "temperature (35°C) - SOC (85%) - rated discharge rate (0.1C) - maximum power discharge duration (30s)". For another example, a set of parameter values ​​of the first battery performance parameter set may be "temperature (15°C) - SOC (95%) - maximum continuous charge rate (2C) - maximum power charge duration (10s)".

[0040] Optionally, the initial power table may simultaneously contain a second battery performance parameter set including a maximum power discharge duration and a second battery performance parameter set including a maximum power charge duration. A set of parameter values ​​of the second battery performance parameter set is composed of a parameter value corresponding to each parameter in the second battery performance parameter set.

[0041] For example, a set of parameter values ​​for the second battery performance parameter set may be “temperature (35°C) - SOC (85%) - maximum power discharge duration (30s) - initial maximum discharge power (1000W)”; for another example, a set of parameter values ​​for the second battery performance parameter set may be “temperature (5°C) - SOC (25%) - maximum power charging duration (20s) - initial maximum charging power (100W)”.

[0042] In some embodiments, the parameters in the first battery performance parameter set correspond to the same battery operating mode, and the battery operating mode is a battery charging mode or a battery discharging mode, that is, the first battery performance parameter set will not be in the form of "temperature-SOC-maximum continuous charging rate (corresponding to the battery charging mode)-maximum power discharge duration (corresponding to the battery discharging mode)". In some embodiments, the parameters in a set of parameter subsets in the second battery performance parameter set and the initial maximum power correspond to the same battery operating mode, that is, the second battery performance parameter set will not be in the form of "temperature-SOC-maximum power charging duration (corresponding to the battery charging mode)-initial maximum discharge power (corresponding to the battery discharging mode)", nor will there be a corresponding relationship with the initial maximum power such as "temperature-SOC-maximum power charging duration-initial maximum charging power-initial maximum discharge power".

[0043] In some embodiments, when the vehicle is just driven by a user after leaving the factory, the BMS in the vehicle can determine the maximum power of the vehicle in real time according to the initial power table.

[0044] In some embodiments, as the vehicle is used and the battery system ages, the battery performance may be affected by multiple factors and will not remain constant or only change with the battery health status. Therefore, the vehicle power needs to be re-evaluated regularly.

[0045] Optionally, the power of the vehicle is re-evaluated when the operating data of the vehicle meets the preset operating conditions. For example, the power of the vehicle is re-evaluated every time the vehicle travels a certain mileage or time (such as 1Wkm or 1 year or vehicle maintenance), that is, when the mileage (operating data) of the vehicle reaches the preset mileage (preset operating condition), the power of the vehicle is re-evaluated, or when the length of time (operating data) of the vehicle in use reaches the preset length of time (preset operating condition), the power of the vehicle is re-evaluated.

[0046] Optionally, when re-evaluating the power of the vehicle, the DC internal resistance of the battery of the vehicle is calibrated under N groups of parameter values ​​of the first battery performance parameter set to obtain a first DC internal resistance corresponding to each group of parameter values.

[0047] Optionally, the target processing system may first determine the selectable parameter values ​​corresponding to each parameter in the first battery performance parameter set, and then combine the selectable parameter values ​​corresponding to each parameter to obtain N groups of parameter values.

[0048] For example, in this embodiment, the parameter value of temperature can select at least 2 temperatures, one of which can be 25°C, and the remaining parameter values ​​can be determined according to the vehicle operating environment temperature. The parameter value of SOC can select 3 SOC points (such as 10% SOC, 50% SOC, 90% SOC), the charge and discharge rate parameter can select the maximum continuous charge rate and the maximum continuous discharge rate, and select a parameter value (such as 2C), and the maximum power charge and discharge duration parameter can select the maximum power charge duration and the maximum power discharge duration, and select a parameter value (such as: 10s). Under the aforementioned conditional restrictions, a set of parameter values ​​that can be obtained is "temperature (25°C)-SOC (50%)-maximum continuous discharge rate (2C)-maximum power discharge duration (10s)".

[0049] In some embodiments, the N groups of parameter values ​​all correspond to battery charging modes.

[0050] In some embodiments, the N groups of parameter values ​​all correspond to battery discharge modes.

[0051] In some embodiments, some parameter value groups in the N parameter value groups correspond to the battery charging mode, and the remaining parameter value groups correspond to the battery discharging mode.

[0052] Optionally, after N groups of parameter values ​​are determined, for each group of parameter values, the target processing system may calibrate the DC internal resistance of the battery of the vehicle under the group of parameter values, thereby obtaining a first DC internal resistance corresponding to the group of parameter values.

[0053] Step S102, determining second DC internal resistances corresponding to N groups of parameter values ​​respectively from a preset initial DC internal resistance table, wherein the initial DC internal resistance table is used to represent the DC internal resistances corresponding to different groups of parameter values ​​of the first battery performance parameter set.

[0054] In this embodiment, for each parameter value in the N parameter value groups, the parameter to which the parameter value in the parameter value group belongs can be determined according to the parameter value group, for example, each parameter value in the N parameter value groups carries the name of the parameter, and for another example, when determining the parameter value group, the parameter to which the parameter value in the parameter value group belongs is recorded in the target processing system. In this embodiment, when comparing parameter values ​​or parameter value groups, the parameters to which they belong are always carried together for comparison, for example, if two parameter values ​​are the same, it is determined that the numerical values ​​of the parameter values ​​and the parameters to which the parameter values ​​belong are the same.

[0055] In some embodiments, for each parameter value in the N parameter value groups, the target processing system may directly determine the DC internal resistance corresponding to the parameter value group that is the same as the parameter value group in the initial DC internal resistance table as the second DC internal resistance corresponding to the parameter value group. Optionally, the parameter value group that is the same as the parameter value group refers to a parameter value group that has the same numerical value as the parameter value group and the same corresponding parameter name.

[0056] Step S103, determining a target power table according to the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table, wherein the initial power table is used to represent the initial maximum power corresponding to the battery under different groups of parameter values ​​of the second battery performance parameter set.

[0057] There is a close relationship between the DC internal resistance of the battery and its maximum power input and output capability. An increase in internal resistance usually leads to a decrease in the maximum power input and output capability, while a decrease in internal resistance helps to improve the maximum power input and output capability. Therefore, the change in battery power can be evaluated by comparing the first DC internal resistance and the second DC internal resistance.

[0058] In some embodiments, the target power table is determined based on the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table. For example, when the first DC internal resistance corresponding to the N groups of parameter values ​​are all less than or equal to the second DC internal resistance corresponding to the group of parameter values, the initial power table is determined as the target power table, and when there is a group of parameter values ​​corresponding to the first DC internal resistance greater than the second DC internal resistance corresponding to the group of parameter values, the initial power table is updated to obtain the target power table.

[0059] Step S104: when the vehicle is running, determine the target maximum power currently allowed for the battery according to the target power table and the current battery performance of the battery.

[0060] Optionally, the target maximum power is a target maximum discharge power or a target maximum charging power.

[0061] Optionally, when the vehicle is running, the target processing system can determine the current allowed target maximum power of the battery based on the target power table, the current battery performance of the battery and the current driving operation state of the vehicle. The current driving operation state of the vehicle is the power input state or the braking force input state. In layman's terms, the power input state can be understood as the accelerator state, and the braking force input state can be understood as the braking state.

[0062] For example, the current driving operation state of the vehicle is the power input state. At this time, it is determined that the battery of the vehicle is in the battery discharge state, and the current battery performance of the battery is collected. The battery performance includes but is not limited to temperature, SOC and maximum power discharge duration, so as to find the corresponding maximum discharge power in the target power table according to the battery performance, and determine the maximum discharge power as the target maximum power. Optionally, the maximum power discharge duration in the battery performance can be determined according to the length of time the vehicle driver has stepped on the accelerator.

[0063] For another example, the current driving operation state of the vehicle is the braking force input state. At this time, it is determined that the battery of the vehicle is in the battery charging state, and the current battery performance of the battery is collected. The battery performance includes but is not limited to temperature, SOC and maximum power charging duration, so as to find the corresponding maximum charging power in the target power table according to the battery performance, and determine the maximum charging power as the target maximum power. Optionally, the maximum power charging duration in the battery performance can be determined according to the length of time the vehicle driver has stepped on the brakes.

[0064] Based on the scheme defined in the above steps S101 to S104, it can be known that in the embodiment of the present invention, the power information of the vehicle is determined according to the difference information between the DC internal resistance before and after the vehicle is used. When the operation data of the vehicle meets the preset operation conditions, the DC internal resistance of the battery of the vehicle is calibrated under N groups of parameter values ​​of the first battery performance parameter set to obtain the first DC internal resistance corresponding to each group of parameter values, and then the second DC internal resistance corresponding to the N groups of parameter values ​​is determined from the preset initial DC internal resistance table, and then the target power table is determined according to the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table, so that when the vehicle is running, the target maximum power currently allowed by the battery is determined according to the target power table and the current battery performance of the battery. Among them, the initial DC internal resistance table is used to indicate the DC internal resistance corresponding to the battery under different groups of parameter values ​​of the first battery performance parameter set, and the initial power table is used to indicate the initial maximum power corresponding to the battery under different groups of parameter values ​​of the second battery performance parameter set.

[0065] It is easy to notice that in the above process, by calibrating the DC internal resistance of the vehicle battery under N groups of parameter values ​​when the vehicle's operating data meets the preset operating conditions, the first DC internal resistance corresponding to each group of parameter values ​​is obtained, thereby realizing the determination of the DC internal resistance of the vehicle battery under various performances after aging. Since there is a close relationship between the DC internal resistance of the battery and its maximum power input and output capabilities, by determining the second DC internal resistance corresponding to the N groups of parameter values ​​from the preset initial DC internal resistance table, and determining the target power table according to the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and the initial power table, it is possible to determine the change in battery power according to the difference information between the DC internal resistance of the vehicle battery before aging and the DC internal resistance of the vehicle battery after aging under different performances, thereby realizing the determination of an accurate target power table, and then when the vehicle is running, the target maximum power currently allowed for the battery is determined according to the target power table and the current battery performance of the battery, which can effectively improve the accuracy of the determined battery power.

[0066] It can be seen that the solution provided in the present application achieves the purpose of determining the power information of the vehicle based on the difference information between the DC internal resistance before and after the vehicle is used, thereby achieving the technical effect of improving the accuracy of the determined battery power, and further solving the technical problem of low accuracy in determining the battery power of the vehicle in the related art.

[0067] In an optional embodiment, in the process of determining the target power table based on the numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to N groups of parameter values ​​and the initial power table, the target processing system can judge, for each group of parameter values ​​in the N groups of parameter values, whether the first DC internal resistance corresponding to the group of parameter values ​​is less than or equal to the second DC internal resistance corresponding to the group of parameter values, and obtain a judgment result. If the judgment results of the N groups of parameter values ​​all indicate that the first DC internal resistance is less than or equal to the second DC internal resistance, the initial power table is determined to be the target power table. If there is a judgment result indicating that the first DC internal resistance is greater than the second DC internal resistance, the target power table is determined based on the first DC internal resistance and the initial power table.

[0068] As the battery is used for a longer time, the chemical reaction inside the battery will gradually slow down, the activity of the electrode material will decrease, and the conductivity of the electrolyte will also decrease. The combined effect of these factors will cause the battery's DC internal resistance to increase, thereby affecting the battery's charge and discharge performance.

[0069] Therefore, for each parameter value in the N parameter value groups, if the first DC internal resistance corresponding to the parameter value group is less than or equal to the second DC internal resistance corresponding to the parameter value group, it is determined that the DC internal resistance of the battery under the parameter value group is not affected by battery aging. If the first DC internal resistance corresponding to the parameter value group is greater than the second DC internal resistance corresponding to the parameter value group, it is determined that the DC internal resistance of the battery under the parameter value group is affected by battery aging.

[0070] In this case, if the judgment results of the N groups of parameter values ​​all indicate that the first DC internal resistance is less than or equal to the second DC internal resistance, it is determined that the DC internal resistance of the battery under the N groups of parameter values ​​(i.e., N types of working performance) is not affected by battery aging, and it can be further determined that the charge and discharge power of the battery is almost not affected, so the initial power table can be directly determined as the target power table. If there is a judgment result indicating that the first DC internal resistance is greater than the second DC internal resistance, it is determined that the DC internal resistance of the battery under the N groups of parameter values ​​is affected by battery aging, and it can be further determined that the charge and discharge power of the battery is affected, so the target power table can be determined based on the first DC internal resistance and the initial power table. For example, the current target DC internal resistance table is determined based on the first DC internal resistance corresponding to the N groups of parameter values, and then the initial power table is updated based on the difference information between the target DC internal resistance table and the initial DC internal resistance table to obtain the target power table.

[0071] It should be noted that the change of DC internal resistance before and after battery aging can effectively reflect the change of the maximum charge and discharge power of the battery before and after battery aging, and the larger the DC internal resistance becomes, the more it affects the maximum charge and discharge power. Therefore, through the above process, the change of the maximum charge and discharge power of the battery before and after battery aging is effectively evaluated, thereby improving the accuracy of the determined target power table.

[0072] In some embodiments, in the process of determining the target power table based on the first DC internal resistance and the initial power table, the target processing system can determine the target DC internal resistance table based on the first DC internal resistance corresponding to N groups of parameter values, and then determine the ratio between the DC internal resistances corresponding to the same group of parameter values ​​in the initial DC internal resistance table and the target DC internal resistance table to obtain the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table, thereby updating the initial power table according to the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table to obtain the target power table.

[0073] Optionally, the target processing system may determine a target DC internal resistance table according to the first DC internal resistance corresponding to the N groups of parameter values. For example, a target DC internal resistance table is formed according to the N groups of first parameter values ​​and the first DC internal resistance corresponding to the N groups of parameter values. For another example, a first DC internal resistance table is formed according to the N groups of first parameter values ​​and the first DC internal resistance corresponding to the N groups of parameter values, and then the first DC internal resistance table is completed according to the data in the first DC internal resistance table to obtain a target DC internal resistance table.

[0074] In some embodiments, there is an identical parameter value group between the initial DC internal resistance table and the target DC internal resistance table. After determining the target DC internal resistance table, the target processing system may determine the ratio between the DC internal resistances corresponding to the same group of parameter values ​​in the initial DC internal resistance table and the target DC internal resistance table, and obtain a target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table. For example, for each pair of identical parameter value groups, the ratio between the DC internal resistances corresponding to the two parameter value groups is calculated to obtain a target ratio. For another example, for each pair of identical parameter value groups, when the DC internal resistance corresponding to the parameter value group in the target DC internal resistance table is greater than the DC internal resistance corresponding to the parameter value group in the initial DC resistance table, the ratio between the DC internal resistances corresponding to the two parameter value groups is calculated to obtain a target ratio.

[0075] In some embodiments, after obtaining the target ratio corresponding to at least one group of parameter values, the target processing system may update the initial power table according to the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table to obtain the target power table. For example, if the magnitude of the DC internal resistance corresponding to two identical parameter value groups has not been compared in the process of determining the target ratio, the initial power table is updated according to the target ratio greater than the preset value in the target ratio corresponding to at least one group of parameter values ​​to obtain the target power table. If the magnitude of the DC internal resistance corresponding to two identical parameter value groups has been compared in the process of determining the target ratio, it is determined that the target ratio corresponding to at least one group of parameter values ​​is greater than the preset value. In this case, the initial power table may be directly updated according to the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table to obtain the target power table.

[0076] In some embodiments, when updating the initial power table according to the target ratio, the target processing system can determine the initial maximum power corresponding to the parameter value group corresponding to the target ratio from the initial power table, and then calculate the ratio between the initial maximum power and the target ratio to obtain the target maximum power corresponding to the group of parameter values. After obtaining the target maximum power corresponding to at least one group of parameter values, the target maximum power is updated to the initial power table to obtain the target power table.

[0077] It should be noted that, through the above process, the initial maximum power in the initial power table is updated according to the change ratio of the DC internal resistance before and after the battery is aged, thereby further improving the accuracy of the obtained target power table.

[0078] In an optional embodiment, the first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration, wherein, in the process of determining the target DC internal resistance table according to the first DC internal resistance corresponding to the N groups of parameter values, the target processing system can determine the first DC internal resistance table according to the first DC internal resistance corresponding to the N groups of parameter values, and then determine the missing temperature values ​​and missing battery state of charge values ​​of the first DC internal resistance table relative to the initial DC internal resistance table, thereby based on the interpolation method, according to the data in the first DC internal resistance table, the DC internal resistance corresponding to the missing temperature values ​​and missing battery state of charge values ​​of the battery in the first DC internal resistance table is supplemented to obtain the target DC internal resistance table. The first DC internal resistance table includes at least N groups of parameter values ​​and the first DC internal resistance corresponding to the N groups of parameter values.

[0079] In some embodiments, the first DC internal resistance table may be composed of data of DC internal resistance calibration. Optionally, when the parameter value group includes the name of the parameter to which the parameter belongs, the first DC internal resistance table may be composed of N groups of parameter values ​​and the first DC internal resistance corresponding to the N groups of parameter values. Optionally, when the parameter value group does not include the name of the parameter to which the parameter belongs, the first DC internal resistance table may be composed of N groups of parameter values, the parameter names corresponding to the N groups of parameter values, and the first DC internal resistance corresponding to the N groups of parameter values.

[0080] Since the parameter value group selected when performing the aforementioned DC internal resistance calibration is limited, and when determining that the maximum charge and discharge power of the battery is affected by battery aging, it is necessary to understand as much as possible the changes in the maximum charge and discharge power of the battery under various working performances, that is, it is necessary to understand as much as possible the changes in the DC internal resistance of the battery under various working performances. Therefore, it is necessary to complete the first DC internal resistance table determined above.

[0081] Optionally, the target processing system may determine the missing temperature values ​​and the missing battery state of charge values ​​of the first DC internal resistance table relative to the initial DC internal resistance table, and then based on the interpolation method, the DC internal resistance corresponding to the battery in the first DC internal resistance table under the missing temperature values ​​and the missing battery state of charge values ​​is supplemented according to the data in the first DC internal resistance table to obtain the target DC internal resistance table.

[0082] For example, for missing temperature values, multiple first parameter value group sets are determined from the first DC internal resistance table, and the battery state of charge values, charge and discharge rate values, and maximum power charge and discharge duration values ​​corresponding to the parameter value groups in each first parameter value group set are the same, but the temperature values ​​are different, and the battery state of charge values, charge and discharge rate values, and maximum power charge and discharge duration values ​​corresponding to different first parameter value group sets are not completely the same. For each first parameter value group set, the target processing system can use an interpolation method to determine the DC internal resistance corresponding to at least one first target parameter value group based on the DC internal resistance corresponding to the parameter value group in the first parameter value group set, wherein the temperature value in the first target parameter value group is the missing temperature value, and the battery state of charge value, charge and discharge rate value, and maximum power charge and discharge duration value corresponding to the first target parameter value group and the first parameter value group set are the same.

[0083] For another example, for a missing battery state of charge value, multiple second parameter value group sets are determined from the first DC internal resistance table, the temperature value, charge and discharge rate value, and maximum power charge and discharge duration value corresponding to the parameter value group in each second parameter value group set are the same, and the battery state of charge values ​​are different, and the temperature value, charge and discharge rate value, and maximum power charge and discharge duration value corresponding to different second parameter value group sets are not completely the same. For each second parameter value group set, the target processing system can use an interpolation method to determine the DC internal resistance corresponding to at least one second target parameter value group based on the DC internal resistance corresponding to the parameter value group in the second parameter value group set, wherein the battery state of charge value in the second target parameter value group is the missing battery state of charge value, and the temperature value, charge and discharge rate value, and maximum power charge and discharge duration value corresponding to the second target parameter value group are the same as those of the second parameter value group set.

[0084] In some embodiments, after obtaining the DC internal resistance corresponding to at least one first target parameter value group, the first DC internal resistance table can be complemented based on the at least one first target parameter value group and the DC internal resistance corresponding to the at least one first target parameter value group to obtain an updated first DC internal resistance table, and then for the missing battery state of charge values, multiple second parameter value group sets are determined from the updated first DC internal resistance table, and then the DC internal resistance corresponding to at least one second target parameter value group is determined based on the interpolation method and the multiple second parameter value group sets, and the updated first DC internal resistance table is complemented based on the at least one second target parameter value group and the DC internal resistance corresponding to the at least one second target parameter value group to obtain a target DC internal resistance table.

[0085] In some embodiments, after obtaining the DC internal resistance corresponding to at least one second target parameter value group, the first DC internal resistance table may be complemented based on the at least one second target parameter value group and the DC internal resistance corresponding to the at least one second target parameter value group to obtain an updated first DC internal resistance table, and then for missing temperature values, multiple first parameter value group sets are determined from the updated first DC internal resistance table, and then the DC internal resistance corresponding to at least one first target parameter value group is determined based on the interpolation method and the multiple first parameter value group sets, and the updated first DC internal resistance table is complemented based on the at least one first target parameter value group and the DC internal resistance corresponding to the at least one first target parameter value group to obtain a target DC internal resistance table.

[0086] In some embodiments, the interpolation method is linear interpolation.

[0087] In some embodiments, the interpolation method may also be an interpolation method other than the linear interpolation method, for example, a polynomial interpolation method, a Lagrange interpolation method, and the like.

[0088] It should be noted that, through the above process, the DC internal resistance of the battery under the working performance of a large number of batteries is determined based on the DC internal resistance of the battery under the working performance of a small number of batteries. This, on the one hand, reduces the time for DC internal resistance calibration and improves the efficiency of determining the target DC internal resistance table. On the other hand, by using the interpolation method to complete the data, the accuracy of the determined target DC internal resistance table is improved.

[0089] In an optional embodiment, the first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration. In the process of determining the ratio between the DC internal resistances corresponding to the same group of parameter values ​​in the initial DC internal resistance table and the target DC internal resistance table to obtain the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table, the target processing system can determine, for each group of parameter values ​​in the initial DC internal resistance table, whether the group of parameter values ​​is included in the target DC resistance table, and then, if the group of parameter values ​​is included in the target DC resistance table, if the DC resistance of the group of parameter values ​​in the target DC resistance table is greater than the DC resistance of the group of parameter values ​​in the initial DC internal resistance table, the target processing system can determine whether the target DC resistance table includes the group of parameter values. If the DC internal resistance in the DC internal resistance table is greater than the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table, the ratio between the DC internal resistance corresponding to the group of parameter values ​​in the target DC internal resistance table and the initial DC internal resistance table is calculated to obtain the target ratio corresponding to the group of parameter values. If the target DC internal resistance table does not include the group of parameter values, the target parameter value group is determined from the target DC internal resistance table. If the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table is greater than the DC internal resistance corresponding to the group of parameter values ​​in the initial DC resistance table, the ratio between the DC internal resistance corresponding to the target parameter value group in the target DC resistance table and the DC internal resistance corresponding to the group of parameter values ​​in the initial DC resistance table is calculated to obtain the target ratio corresponding to the group of parameter values. The target parameter value group has the same temperature value and battery state of charge value as the group of parameter values, but has different charge and discharge rate values ​​and / or maximum power charge and discharge duration values.

[0090] Since the selected parameter value groups are limited when performing the aforementioned DC internal resistance calibration, there will be missing temperature values, missing battery state of charge values, missing charge and discharge rate values, and maximum power charge and discharge duration values ​​relative to the initial DC internal resistance table. Therefore, the parameter value groups included in the initial DC internal resistance table may not all exist in the target DC internal resistance table. For each group of parameter values ​​in the initial DC internal resistance table, the target processing system needs to determine whether the group of parameter values ​​is included in the target DC internal resistance table.

[0091] Since under the same parameter value group, the DC internal resistance of the battery will increase as the battery ages and cause the maximum charge and discharge power of the battery to be affected, therefore, when the DC internal resistance of the aged battery is not greater than the DC internal resistance of the battery before aging under the same parameter value group, it is determined that the maximum charge and discharge power of the battery is not affected by battery aging, and there is no need to update the initial maximum power corresponding to this group of parameter values ​​in the initial power table. Conversely, when the DC internal resistance of the aged battery is greater than the DC internal resistance of the battery before aging under the same parameter value group, it is determined that the maximum charge and discharge power of the battery is affected by battery aging, and the initial maximum power corresponding to this group of parameter values ​​in the initial power table needs to be updated.

[0092] Therefore, in this embodiment, after determining whether the target DC internal resistance table includes the group of parameter values, when the target DC internal resistance table includes the group of parameter values, if the DC internal resistance of the group of parameter values ​​in the target DC internal resistance table is greater than the DC internal resistance of the group of parameter values ​​in the initial DC internal resistance table, the ratio between the DC internal resistances corresponding to the group of parameter values ​​in the target DC internal resistance table and the initial DC internal resistance table is calculated to obtain the target ratio corresponding to the group of parameter values.

[0093] For example, the DC internal resistance of the group of parameter values ​​in the target DC internal resistance table is divided by the DC internal resistance of the group of parameter values ​​in the initial DC internal resistance table to obtain the target ratio.

[0094] Optionally, after determining whether the target DC internal resistance table includes the group of parameter values, if the target DC internal resistance table does not include the group of parameter values, the target processing system may determine the target parameter value group from the target DC internal resistance table.

[0095] In some embodiments, the target parameter value group has the same temperature value and battery state of charge value as the aforementioned group of parameter values, but different charge and discharge rate values ​​and / or maximum power charge and discharge duration values. More specifically, the target parameter value group has the same temperature value and battery state of charge value as the aforementioned group of parameter values, but different charge and discharge rate values ​​and / or maximum power charge and discharge duration values, and the target parameter value group has the same parameters as the aforementioned group of parameter values ​​in terms of charge and discharge rate values ​​and maximum power charge and discharge duration values.

[0096] In some embodiments, the parameter value corresponding to the same charge and discharge rate parameter in the N groups of parameter values ​​is unique, and the parameter value corresponding to the same maximum power charge and discharge duration parameter is unique. For example, the maximum continuous charge rate value in the N groups of parameter values ​​is 1C, the maximum continuous discharge rate value is 2C, the maximum power charge duration value is 10s, and the maximum power discharge duration value is 20s. That is, the parameter value corresponding to the same charge and discharge rate parameter in the obtained target DC internal resistance table is unique, and the parameter value corresponding to the same maximum power charge and discharge duration parameter is unique.

[0097] For example, if the group of parameter values ​​in the initial DC internal resistance table is "temperature (25°C) - SOC (50%) - maximum continuous discharge rate (2C) - maximum power discharge duration (10s)", or, the group of parameter values ​​is "temperature (25°C) - SOC (50%) - maximum continuous discharge rate (1C) - maximum power discharge duration (10s)", or, the group of parameter values ​​is "temperature (25°C) - SOC (50%) - maximum continuous discharge rate (2C) - maximum power discharge duration (20s)", and there is a group of parameter values ​​in the target DC internal resistance table as "temperature (25°C) - SOC (50%) - maximum continuous discharge rate (1C) - maximum power discharge duration (20s)", then this group of parameter values ​​in the target DC internal resistance table can be determined as the target parameter value group corresponding to the three forms of parameter value groups in the aforementioned initial DC internal resistance table.

[0098] For another example, assuming that there is a set of parameter values ​​in the target DC internal resistance table, namely "temperature (25°C) - SOC (50%) - maximum continuous charging rate (1C) - maximum power charging duration (20s)", then due to the different corresponding parameters, this set of parameter values ​​in the target DC internal resistance table cannot be determined as the target parameter value group corresponding to the three forms of parameter value groups in the aforementioned initial DC internal resistance table.

[0099] Optionally, after determining the target parameter value group corresponding to the above-mentioned group of parameter values, if the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table is greater than the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table, then the ratio between the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table and the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table is calculated to obtain the target ratio corresponding to the group of parameter values.

[0100] For example, the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table is divided by the ratio between the DC internal resistances corresponding to the group of parameter values ​​in the initial DC internal resistance table to obtain the target ratio corresponding to the group of parameter values.

[0101] In some embodiments, the target ratio can be expressed as α=(DCR' / DCR), wherein α represents the target ratio, DCR represents a parameter value group in the initial DC internal resistance table, and DCR' represents the parameter value group in the target DC internal resistance table, or the parameter value group in the initial DC internal resistance table corresponds to the target parameter value group in the target DC internal resistance table.

[0102] It should be noted that, through the above process, on the one hand, when the DC internal resistance of the battery under a certain working performance increases, the target ratio under the working performance is determined to update the corresponding initial maximum power, thereby avoiding the determination of the target ratio corresponding to the initial maximum power that does not need to be updated, thereby improving work efficiency. On the other hand, effective matching of the parameter value group in the target DC internal resistance table and the initial DC internal resistance table is achieved, thereby achieving accurate determination of the target ratio, and then achieving accurate determination of the battery power.

[0103] In an optional embodiment, in the process of determining the first DC internal resistance table according to the first DC internal resistance corresponding to the N groups of parameter values, the target processing system can determine the M groups of parameter values ​​corresponding to the first battery performance parameter set, and then perform DC internal resistance calibration on the battery supplement of the vehicle according to the M groups of parameter values ​​to obtain the first DC internal resistance corresponding to each group of parameter values ​​in the M groups of parameter values, thereby determining the first DC internal resistance table according to the first DC internal resistance corresponding to the N groups of parameter values ​​and the first DC internal resistance corresponding to the M groups of parameter values. There is no same group of parameter values ​​between the M groups of parameter values ​​and the N groups of parameter values.

[0104] When the data in the first DC internal resistance table is small, supplementing the first DC internal resistance table according to the interpolation method may result in the accuracy of the supplemented data being unstable. Therefore, in this embodiment, when there is a judgment result indicating that the first DC internal resistance is greater than the second DC internal resistance, the battery can be supplemented with DC internal resistance calibration, so as to determine the first DC internal resistance table in combination with the supplemented DC internal resistance calibration data.

[0105] Optionally, in the process of determining the first DC internal resistance table according to the first DC internal resistance corresponding to N groups of parameter values, the target processing system may determine M groups of parameter values ​​corresponding to the first battery performance parameter set, wherein there are no identical groups of parameter values ​​between the M groups of parameter values ​​and the N groups of parameter values.

[0106] Optionally, the target processing system may first expand the selectable parameter values ​​corresponding to each parameter in the first battery performance parameter set, and then combine the expanded selectable parameter values ​​corresponding to each parameter to obtain M groups of parameter values.

[0107] For example, the target processing system can increase the temperature values ​​to at least 5, such as, according to the vehicle operating environment temperature, selecting to increase the relatively high temperature value or the relatively low temperature value, and increase the test SOC to at least 6 (such as 10%, 20%, 30%, 50%, 70%, 90%), so as to determine the M group parameter values ​​according to the expanded temperature value and the expanded SOC and the original charge and discharge rate value and the maximum power charge and discharge duration value.

[0108] After determining the M groups of parameter values, the target processing system can perform DC internal resistance calibration on the battery supplement of the vehicle according to the M groups of parameter values, obtain the first DC internal resistance corresponding to each group of parameter values ​​in the M groups of parameter values, and perform DC internal resistance calibration on the battery supplement of the vehicle according to the M groups of parameter values, obtain the first DC internal resistance corresponding to each group of parameter values ​​in the M groups of parameter values. Optionally, the first DC internal resistance table includes at least N groups of parameter values ​​and the first DC internal resistance corresponding to the N groups of parameter values, and also includes M groups of parameter values ​​and the first DC internal resistance corresponding to the M groups of parameter values.

[0109] In some embodiments, a method for obtaining the first DC internal resistance corresponding to each group of parameter values ​​in the M groups of parameter values ​​is the same as a method for obtaining the first DC internal resistance corresponding to the N groups of parameter values, and a method for determining the first DC internal resistance table based on the first DC internal resistance corresponding to the N groups of parameter values ​​and the first DC internal resistance corresponding to the M groups of parameter values ​​is the same as a method for determining the first DC internal resistance table based only on the first DC internal resistance corresponding to the N groups of parameter values, so it will not be repeated here.

[0110] It should be noted that, through the above process, the richness of the data in the first DC internal resistance table is improved, so that the accuracy of the determined target DC internal resistance table can be effectively improved, thereby improving the accuracy of determining the battery power.

[0111] In an optional embodiment, the first battery performance parameter set includes a second battery performance parameter set, wherein, in the process of updating the initial power table according to the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table to obtain the target power table, the target processing system can determine, for each group of parameter values ​​in the initial power table, whether there is a target ratio corresponding to the group of parameter values ​​in the target ratio corresponding to at least one group of parameter values; if there is a target ratio corresponding to the group of parameter values, then calculate the ratio between the initial maximum power corresponding to the group of parameter values ​​in the initial power table and the target ratio corresponding to the group of parameter values ​​to obtain the target maximum power corresponding to the group of parameter values; and update the initial power table according to the target maximum power corresponding to the parameter value group in the initial power table to obtain the target power table.

[0112] In some embodiments, the first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration, and the second battery performance parameter set includes temperature, battery state of charge, and maximum power charge and discharge duration.

[0113] Therefore, for each group of parameter values ​​in the initial power table, the target processing system can determine whether there is a target ratio value corresponding to the group of parameter values ​​in the target ratio values ​​corresponding to at least one group of parameter values. For example, for each group of parameter values ​​in the initial power table, it is determined whether there is a parameter value group including the group of parameter values ​​in at least one group of parameter values. If there is a parameter value group including the group of parameter values, the target ratio value corresponding to the parameter value group including the group of parameter values ​​is determined as the target ratio value corresponding to the group of parameter values. Conversely, if there is no parameter value group including the group of parameter values ​​in at least one group of parameter values, it is determined that there is no target ratio value corresponding to the group of parameter values.

[0114] Optionally, if there is a target ratio corresponding to the group of parameter values, the ratio between the initial maximum power corresponding to the group of parameter values ​​in the initial power table and the target ratio corresponding to the group of parameter values ​​is calculated to obtain the target maximum power corresponding to the group of parameter values. For example, the target maximum power can be expressed as P'=P*(1 / α), where P' represents the target maximum power corresponding to a group of parameter values ​​in the initial power table, P represents the initial maximum power corresponding to the group parameter value in the initial power table, and α represents the target ratio corresponding to the group of parameter values.

[0115] Optionally, if there is no target ratio corresponding to the group of parameter values, it is determined that the initial maximum power corresponding to the group of parameter values ​​in the initial power table does not need to be updated.

[0116] After determining whether each group of parameter values ​​in the initial power table has a corresponding target maximum power, the target processing system may update the initial power table according to the target maximum power corresponding to the parameter value group in the initial power table to obtain a target power table.

[0117] For example, the target processing system includes a BMS in a vehicle, and the target processing system may directly determine a target power table, and then write the target power table into the BMS to replace an initial power table in the BMS.

[0118] For another example, the target processing system may write the target maximum power corresponding to the parameter value in the initial power table into the BMS in the vehicle, so that the BMS in the vehicle updates the initial power table according to the target maximum power to obtain the target power table.

[0119] For another example, the target processing system can write the target ratio corresponding to the parameter value group in the initial power table and the calculation formula P'=P*(1 / α) into the BMS in the vehicle, so that the BMS in the vehicle can calculate the target maximum power according to the target ratio and the calculation formula, and update the initial power table according to the target maximum power to obtain the target power table.

[0120] Optionally, when the target processing system does not directly write the target power table into the BMS, in order to enable the BMS to accurately determine the target power table when the vehicle's operating data meets the preset operating conditions next time, the target processing system may update the current power table in the BMS to the initial power table before writing the target maximum power corresponding to the parameter value in the initial power table into the BMS, or before writing the target ratio corresponding to the parameter value group in the initial power table and the calculation formula P'=P*(1 / α) into the BMS in the vehicle.

[0121] In some embodiments, when updating the target power table according to the target maximum power, the target processing system may replace the initial maximum power corresponding to the parameter value group in the initial power table with the target maximum power corresponding to the parameter value group in the initial power table, thereby obtaining the target power table.

[0122] It should be noted that, through the above process, the power information of the battery after aging is determined based on the proportional relationship of the DC internal resistance before and after battery aging and the power information before battery aging, thereby improving the accuracy of the determined target power table.

[0123] In some embodiments, before calibrating the DC internal resistance of the vehicle's battery under N groups of parameter values ​​of a first battery performance parameter set, the target processing system may count the mileage of the vehicle, determine the mileage as operating data, and determine whether the operating data meets preset operating conditions, or count the duration between the target time point and the time point when the user first uses the vehicle, determine the duration as operating data, and determine whether the operating data meets the preset operating conditions.

[0124] For example, when the operating data is the mileage traveled, the preset operating condition may be "the mileage traveled is an integer multiple of 1Wkm", so that every time the vehicle travels 1Wkm, it is determined that the vehicle's operating data meets the preset operating condition; conversely, when the vehicle has not traveled to an integer multiple of 1Wkm, it is determined that the vehicle's operating data does not meet the preset operating condition.

[0125] For another example, when the operating data is the duration between a target time point and the time point when the user first uses the vehicle, the preset operating condition may be "the duration between the target time point and the time point when the user first uses the vehicle is a multiple of 1 year". Optionally, the target time point may be the current time point, and the duration between the target time point and the time point when the user first uses the vehicle may be understood as the duration the user uses the vehicle. Thus, every time the vehicle is used for one year, it is determined that the vehicle's operating data meets the preset operating conditions. Conversely, when the vehicle has not been used for an integer multiple of one year, it is determined that the vehicle's operating data does not meet the preset operating conditions. In this way, regular updating of the vehicle's battery power can be achieved.

[0126] It should be noted that since battery aging is affected by vehicle use, by determining the vehicle's mileage or usage time as operating data to determine whether the operating data meets the preset operating conditions, it is convenient to accurately determine the timing of updating the vehicle's battery power, thereby improving the applicability of the method provided in this application.

[0127] Figure 2 The following is a flow chart of an optional method for determining the battery power of a vehicle according to an embodiment of the present invention. Figure 2 ,according to Figure 2 An optional application process of the method for determining the battery power of a vehicle is described. Figure 2 As shown, before the vehicle leaves the factory, the target processing system can store the initial DC internal resistance table and the initial power table in the vehicle's BMS (Battery Management System). After the vehicle has traveled a certain mileage or time, the DC internal resistance of the battery is calibrated to obtain the calibration result (i.e., the first DC internal resistance mentioned above). Afterwards, the target processing system can compare the calibration result with the data in the initial DC internal resistance table, and determine whether to update the initial power table based on the comparison result.

[0128] Furthermore, if Figure 2 As shown, when it is determined that the initial power table does not need to be updated, the initial power table is determined as the target power table, and the target processing system does not need to update the initial power table stored in the BMS. When the vehicle is running, the BMS in the vehicle determines the target maximum power currently allowed for the battery based on the target power table and the current battery performance of the battery. When it is determined that the initial power table needs to be updated, the target processing system can determine the update data and write the update data into the BMS. For example, the target ratio corresponding to the parameter value group in the above-mentioned initial power table and the calculation formula P'=P*(1 / α) are determined as update data, and written into the BMS in the vehicle, so that the BMS in the vehicle can calculate the target maximum power based on the target ratio and the calculation formula, and update the initial power table based on the target maximum power to obtain the target power table. Thus, when the vehicle is running, the BMS in the vehicle determines the target maximum power currently allowed for the battery based on the target power table and the current battery performance of the battery.

[0129] Optionally, the application process of the method for determining the battery power of a vehicle is described with a specific example. For example, when the operating data of the vehicle meets the preset operating conditions, the first DC internal resistance corresponding to the battery of the vehicle under the three sets of parameter values ​​of the first battery performance parameter set can be as shown in Table 1:

[0130] Table 1

[0131]

[0132] The initial DC internal resistance table can be shown in Table 2:

[0133] Table 2

[0134]

[0135] By comparing Table 1 and Table 2, it can be determined that the first DC internal resistance corresponding to the first two groups of parameter values ​​in Table 1 is greater than the second DC internal resistance corresponding to the group of parameter values, and the first DC internal resistance corresponding to the third group of parameter values ​​in Table 1 is equal to the second DC internal resistance corresponding to the group of parameter values. In this case, the target processing system can first determine the target DC internal resistance table based on the first DC internal resistance corresponding to the three groups of parameter values ​​in Table 1. Optionally, the target processing system can first obtain the same first DC internal resistance table as Table 1 (it can also supplement the DC internal resistance calibration to obtain a first DC internal resistance table with relatively richer content), and then, based on the interpolation method, the DC internal resistance corresponding to the battery in the first DC internal resistance table at the missing battery state of charge value is supplemented according to the data in the first DC internal resistance table to obtain the target DC internal resistance table as shown in Table 3:

[0136] Table 3

[0137]

[0138] Further, the target processing system can calculate the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table. Since the DC internal resistance corresponding to the first three groups of parameter values ​​in Table 3 is greater than the DC internal resistance of the group of parameter values ​​in the initial DC internal resistance table (i.e., Table 2), the target ratios corresponding to the three groups of parameter values ​​are calculated to obtain a target ratio α=0.839 / 0.836=1.0035 corresponding to the first group of parameter values, a target ratio α=0.845 / 0.840=1.0059 corresponding to the second group of parameter values, and a target ratio α=0.852 / 0.849=1.0035 corresponding to the third group of parameter values.

[0139] After determining the target ratio, the target processing system can update the initial power table according to the target ratio corresponding to at least one set of parameter values ​​in the initial DC internal resistance table to obtain a target power table. Assume that the initial power table is as shown in Table 4:

[0140] Table 4

[0141]

[0142] For the initial power table in Table 4, the first three groups of parameter values ​​have corresponding target ratios. Therefore, for the first three groups of parameter values ​​in Table 4, the target maximum power P'=P*(1 / α)=33.3*(1 / 1.0035)=33.18 corresponding to the first group of parameter values, the target maximum power P'=P*(1 / α)=31.45*(1 / 1.0059)=31.26 corresponding to the second group of parameter values, the target maximum power P'=P*(1 / α)=29.6*(1 / 1.0035)=29.49 corresponding to the third group of parameter values, and the fourth group of parameter values ​​does not need to be updated. Therefore, the final target power table can be shown in Table 5:

[0143] Table 5

[0144]

[0145] It can be seen that the solution provided in the present application achieves the purpose of determining the power information of the vehicle based on the difference information between the DC internal resistance before and after the vehicle is used, thereby achieving the technical effect of improving the accuracy of the determined battery power, and further solving the technical problem of low accuracy in determining the battery power of the vehicle in the related art.

[0146] Example 2

[0147] According to an embodiment of the present invention, an embodiment of a device for determining battery power of a vehicle is provided, wherein: Figure 3 is a schematic diagram of an optional device for determining battery power of a vehicle according to an embodiment of the present invention, such as Figure 3 As shown, the device comprises:

[0148] The processing module 301 is used to calibrate the DC internal resistance of the battery of the vehicle under N groups of parameter values ​​of the first battery performance parameter set when the operating data of the vehicle meets the preset operating conditions, and obtain the first DC internal resistance corresponding to each group of parameter values;

[0149] A first determination module 302 is used to determine second DC internal resistances corresponding to N groups of parameter values ​​from a preset initial DC internal resistance table, wherein the initial DC internal resistance table is used to indicate DC internal resistances corresponding to different groups of parameter values ​​of a first battery performance parameter set;

[0150] A second determination module 303 is used to determine a target power table according to a numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and an initial power table, wherein the initial power table is used to indicate an initial maximum power corresponding to the battery under different groups of parameter values ​​of the second battery performance parameter set;

[0151] The third determination module 304 is used to determine the target maximum power currently allowed for the battery according to the target power table and the current battery performance of the battery when the vehicle is running.

[0152] It should be noted that the above-mentioned processing module 301, the first determination module 302, the second determination module 303 and the third determination module 304 correspond to steps S101 to S104 in the above-mentioned embodiment, and the examples and application scenarios implemented by the four modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above-mentioned embodiment 1.

[0153] Optionally, the second determination module also includes: a first judgment submodule, used to judge whether the first DC internal resistance corresponding to each group of parameter values ​​in the N groups of parameter values ​​is less than or equal to the second DC internal resistance corresponding to the group of parameter values, and obtain a judgment result; the first determination submodule, used to determine that the initial power table is the target power table if the judgment results of the N groups of parameter values ​​all indicate that the first DC internal resistance is less than or equal to the second DC internal resistance; and the second determination submodule, used to determine the target power table based on the first DC internal resistance and the initial power table if there is a judgment result indicating that the first DC internal resistance is greater than the second DC internal resistance.

[0154] Optionally, the second determination submodule also includes: a first determination unit, used to determine a target DC internal resistance table based on a first DC internal resistance corresponding to N groups of parameter values; a second determination unit, used to determine the ratio between the DC internal resistances corresponding to the same group of parameter values ​​in the initial DC internal resistance table and the target DC internal resistance table, to obtain a target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table; and an updating unit, used to update the initial power table according to the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table, to obtain a target power table.

[0155] Optionally, the first determination unit also includes: a first determination subunit, used to determine a first DC internal resistance table according to the first DC internal resistance corresponding to N groups of parameter values, wherein the first DC internal resistance table includes at least N groups of parameter values ​​and the first DC internal resistance corresponding to the N groups of parameter values; a second determination subunit, used to determine the missing temperature values ​​and the missing battery state of charge values ​​of the first DC internal resistance table relative to the initial DC internal resistance table; a first processing subunit, used to complement the DC internal resistance corresponding to the missing temperature values ​​and the missing battery state of charge values ​​of the battery in the first DC internal resistance table based on the interpolation method and according to the data in the first DC internal resistance table, to obtain a target DC internal resistance table.

[0156] Optionally, the second determination unit further includes: a first judgment subunit, used to determine, for each group of parameter values ​​in the initial DC internal resistance table, whether the target DC internal resistance table includes the group of parameter values; a first calculation subunit, used to, when the target DC internal resistance table includes the group of parameter values, calculate the ratio between the DC internal resistances corresponding to the group of parameter values ​​in the target DC internal resistance table and the initial DC internal resistance table respectively if the DC internal resistance of the group of parameter values ​​in the target DC internal resistance table is greater than the DC internal resistance of the group of parameter values ​​in the initial DC internal resistance table, to obtain a target ratio corresponding to the group of parameter values; a third determination subunit, used to determine whether the target DC internal resistance table includes the group of parameter values; and a third calculation subunit, used to determine whether the target DC internal resistance table includes the group of parameter values. In the case of including the group of parameter values, determining the target parameter value group from the target DC internal resistance table, wherein the target parameter value group has the same temperature value and battery state of charge value as the group of parameter values, but different charge and discharge rate values ​​and / or maximum power charge and discharge duration values; a second calculation subunit is used to calculate the ratio between the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table and the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table, if the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table is greater than the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table, to obtain a target ratio corresponding to the group of parameter values.

[0157] Optionally, the first determination subunit also includes: a fourth determination subunit, used to determine M groups of parameter values ​​corresponding to the first battery performance parameter set, wherein there are no identical groups of parameter values ​​between the M groups of parameter values ​​and the N groups of parameter values; a second processing subunit, used to calibrate the DC internal resistance of the vehicle's battery supplement based on the M groups of parameter values, and obtain the first DC internal resistance corresponding to each group of parameter values ​​in the M groups of parameter values; and a fifth determination subunit, used to determine the first DC internal resistance table based on the first DC internal resistance corresponding to the N groups of parameter values ​​and the first DC internal resistance corresponding to the M groups of parameter values.

[0158] Optionally, the update unit also includes: a second judgment subunit, used to judge, for each group of parameter values ​​in the initial power table, whether there is a target ratio corresponding to the group of parameter values ​​in at least one target ratio corresponding to the group of parameter values; a third calculation subunit, used to calculate the ratio between the initial maximum power corresponding to the group of parameter values ​​in the initial power table and the target ratio corresponding to the group of parameter values, if there is a target ratio corresponding to the group of parameter values, to obtain the target maximum power corresponding to the group of parameter values; an update subunit, used to update the initial power table according to the target maximum power corresponding to the parameter value group in the initial power table, to obtain a target power table.

[0159] Optionally, the device for determining the battery power of the vehicle also includes: a first judgment unit, used to count the mileage of the vehicle, determine the mileage as operating data, and judge whether the operating data meets preset operating conditions, or, a second judgment unit, used to count the duration between the target time point and the time point when the user first uses the vehicle, determine the duration as operating data, and judge whether the operating data meets the preset operating conditions.

[0160] Example 3

[0161] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, in which a computer program is stored, wherein the computer program is configured to execute the above-mentioned method for determining the battery power of a vehicle when running.

[0162] Example 4

[0163] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, wherein: Figure 4 is a schematic diagram of an optional electronic device according to an embodiment of the present invention, such as Figure 4 As shown, the electronic device includes one or more processors; a memory for storing one or more programs, which, when the one or more programs are executed by the one or more processors, enables the one or more processors to run the programs, wherein the programs are configured to execute the above-mentioned method for determining the battery power of the vehicle when running.

[0164] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0165] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0166] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, 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 units or modules, which can be electrical or other forms.

[0167] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0168] In addition, each functional unit in each embodiment of the present invention 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.

[0169] 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 computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0170] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining the battery power of a vehicle, characterized in that: include: When the operating data of the vehicle meets the preset operating conditions, the DC internal resistance of the battery of the vehicle is calibrated under N groups of parameter values ​​of the first battery performance parameter set to obtain a first DC internal resistance corresponding to each group of parameter values; Determining second DC internal resistances corresponding to the N groups of parameter values ​​respectively from a preset initial DC internal resistance table, wherein the initial DC internal resistance table is used to indicate the DC internal resistances corresponding to the battery under different groups of parameter values ​​of the first battery performance parameter set; Determine a target power table according to a numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and an initial power table, wherein the initial power table is used to indicate the initial maximum power corresponding to the battery under different groups of parameter values ​​of the second battery performance parameter set; When the vehicle is running, the target maximum power currently allowed for the battery is determined according to the target power table and the current battery performance of the battery.

2. The method according to claim 1, characterized in that Determining a target power table according to a numerical relationship between the first DC internal resistance and the second DC internal resistance corresponding to the N groups of parameter values ​​and an initial power table includes: For each group of parameter values ​​in the N groups of parameter values, determining whether a first DC internal resistance corresponding to the group of parameter values ​​is less than or equal to a second DC internal resistance corresponding to the group of parameter values, and obtaining a determination result; If the judgment results of the N groups of parameter values ​​all indicate that the first DC internal resistance is less than or equal to the second DC internal resistance, determining the initial power table as the target power table; If there is a judgment result indicating that the first DC internal resistance is greater than the second DC internal resistance, the target power table is determined according to the first DC internal resistance and the initial power table.

3. The method according to claim 2, characterized in that Determining the target power table according to the first DC internal resistance and the initial power table includes: Determine a target DC internal resistance table according to the first DC internal resistance corresponding to the N groups of parameter values; Determine the ratio between the DC internal resistances corresponding to the same group of parameter values ​​in the initial DC internal resistance table and the target DC internal resistance table, and obtain a target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table; The initial power table is updated according to the target ratio corresponding to at least one set of parameter values ​​in the initial DC internal resistance table to obtain the target power table.

4. The method according to claim 3, characterized in that The first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration, wherein a target DC internal resistance table is determined according to the first DC internal resistance corresponding to the N groups of parameter values, including: Determine a first DC internal resistance table according to the first DC internal resistances corresponding to the N groups of parameter values, wherein the first DC internal resistance table at least includes the N groups of parameter values ​​and the first DC internal resistances corresponding to the N groups of parameter values; Determining missing temperature values ​​and missing battery state of charge values ​​of the first DC internal resistance table relative to the initial DC internal resistance table; Based on the interpolation method, the DC internal resistance corresponding to the missing temperature values ​​and the missing battery state of charge values ​​in the first DC internal resistance table are supplemented according to the data in the first DC internal resistance table to obtain the target DC internal resistance table.

5. The method according to claim 3, characterized in that: The first battery performance parameter set includes temperature, battery state of charge, charge and discharge rate, and maximum power charge and discharge duration, wherein determining the ratio between the DC internal resistances corresponding to the same group of parameter values ​​in the initial DC internal resistance table and the target DC internal resistance table to obtain the target ratio corresponding to at least one group of parameter values ​​in the initial DC internal resistance table includes: For each group of parameter values ​​in the initial DC internal resistance table, determining whether the target DC internal resistance table includes the group of parameter values; In a case where the target DC internal resistance table includes the group of parameter values, if the DC internal resistance of the group of parameter values ​​in the target DC internal resistance table is greater than the DC internal resistance of the group of parameter values ​​in the initial DC internal resistance table, then calculating the ratio between the DC internal resistances corresponding to the group of parameter values ​​in the target DC internal resistance table and the initial DC internal resistance table, to obtain a target ratio corresponding to the group of parameter values; If the target DC internal resistance table does not include the group of parameter values, determining a target parameter value group from the target DC internal resistance table, wherein the target parameter value group is the same as the temperature value and battery state of charge value of the group of parameter values, but is different from the charge and discharge rate value and / or the maximum power charge and discharge duration value; If the DC internal resistance corresponding to the target parameter value group in the target DC internal resistance table is greater than the DC internal resistance corresponding to the group of parameter values ​​in the initial DC internal resistance table, the ratio between the DC internal resistance corresponding to the target parameter value group in the target DC resistance table and the DC internal resistance corresponding to the group of parameter values ​​in the initial DC resistance table is calculated to obtain the target ratio corresponding to the group of parameter values.

6. The method according to claim 4, characterized in that Determining a first DC internal resistance table according to the first DC internal resistances corresponding to the N groups of parameter values ​​includes: Determine M groups of parameter values ​​corresponding to the first battery performance parameter set, wherein the M groups of parameter values ​​do not have the same group of parameter values ​​as the N groups of parameter values; Calibrate the DC internal resistance of the battery of the vehicle according to the M groups of parameter values ​​to obtain a first DC internal resistance corresponding to each group of parameter values ​​in the M groups of parameter values; The first DC internal resistance table is determined according to the first DC internal resistances corresponding to the N groups of parameter values ​​and the first DC internal resistances corresponding to the M groups of parameter values.

7. The method according to claim 3, characterized in that The first battery performance parameter set includes the second battery performance parameter set, wherein the initial power table is updated according to a target ratio corresponding to at least one set of parameter values ​​in the initial DC internal resistance table to obtain the target power table, including: For each group of parameter values ​​in the initial power table, determining whether there is a target ratio corresponding to the group of parameter values ​​among the target ratios corresponding to the at least one group of parameter values; If there is a target ratio corresponding to the group of parameter values, then calculating the ratio between the initial maximum power corresponding to the group of parameter values ​​in the initial power table and the target ratio corresponding to the group of parameter values ​​to obtain the target maximum power corresponding to the group of parameter values; The initial power table is updated according to the target maximum power corresponding to the parameter value group in the initial power table to obtain the target power table.

8. The method according to claim 1, characterized in that Before calibrating the DC internal resistance of the battery of the vehicle under N groups of parameter values ​​of the first battery performance parameter set, the method further includes: counting the mileage of the vehicle, determining the mileage as the operation data, and determining whether the operation data meets the preset operation condition, or, The duration between the target time point and the time point when the user first uses the vehicle is counted, the duration is determined as the operation data, and it is determined whether the operation data meets the preset operation condition.

9. A device for determining battery power of a vehicle, characterized in that: include: A processing module, configured to, when the operating data of the vehicle meets a preset operating condition, calibrate the DC internal resistance of the battery of the vehicle under N groups of parameter values ​​of a first battery performance parameter set, and obtain a first DC internal resistance corresponding to each group of parameter values; a first determining module, configured to determine second DC internal resistances respectively corresponding to the N groups of parameter values ​​from a preset initial DC internal resistance table, wherein the initial DC internal resistance table is used to indicate DC internal resistances corresponding to the battery under different groups of parameter values ​​of the first battery performance parameter set; A second determination module, configured to determine a target power table according to a numerical relationship between a first DC internal resistance and a second DC internal resistance corresponding to the N groups of parameter values ​​and an initial power table, wherein the initial power table is used to indicate an initial maximum power corresponding to the battery under different groups of parameter values ​​of a second battery performance parameter set; The third determination module is used to determine the target maximum power currently allowed for the battery according to the target power table and the current battery performance of the battery when the vehicle is running.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program is configured to execute the method for determining the battery power of a vehicle as claimed in any one of claims 1 to 8 when executed.

11. An electronic device, characterized in that: The electronic device includes one or more processors; A memory for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to run the programs, wherein the programs are configured to execute the method for determining the battery power of the vehicle as described in any one of claims 1 to 8 when run.

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