Battery charging method and device, vehicle and storage medium

Abstract

The invention discloses a battery charging method and device, a vehicle and a storage medium, and relates to the technical field of vehicle batteries, and the method comprises the steps: obtaining the battery health state, the remaining capacity and the current battery temperature of a vehicle battery under the condition that the vehicle battery is detected to need to be charged; a charging current mapping relation corresponding to the state of health of the battery is determined, the charging current mapping relation represents a mapping relation between a preset temperature interval and a preset calibration permissible current under the preset residual electric quantity, and the preset calibration permissible current represents a mapping relation between the preset temperature interval and the preset calibration permissible current under the preset residual electric quantity; the allowable current of the preset actual temperature interval corresponding to the preset temperature interval; and searching a target calibration permissible current corresponding to the current battery temperature and the residual electric quantity in the charging current mapping relation, and charging the vehicle battery according to the target calibration permissible current. The problem that the charging reliability of the vehicle battery is poor due to the fact that the matching degree of the actual temperature of the battery and the charging current is low is solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle battery technology, and in particular to a battery charging method, device, vehicle, and storage medium. Background Art

[0002] With the continuous development and popularization of new energy vehicles, charging time has become one of the most important factors for more and more users to consider when purchasing a car. Fast charging maps are the most fundamental data for designing electric vehicle charging time indicators. The maps include the maximum available current corresponding to different battery temperatures.

[0003] However, currently, a fixed map is usually used as the charging standard. The real-time temperature collected from the outside of the battery is used to match the corresponding maximum current in the map for fast charging. However, in the actual charging process, it is found that there may be a large temperature difference between the inside and outside of the battery, resulting in a mismatch between the detected external battery temperature and the actual battery temperature. This in turn causes a mismatch between the actual battery temperature and the corresponding current in the map, resulting in poor vehicle battery charging reliability. For example, a matched current that is too small can easily cause the vehicle battery to charge too slowly, while a matched current that is too large can easily cause lithium deposition in the battery and cause a fire.

[0004] Therefore, there is currently a problem of poor vehicle battery charging reliability due to the low matching between the actual battery temperature and the charging current.

[0005] The above content is only used to assist in understanding the technical solutions of the embodiments of the present application and does not constitute an admission that the above content is prior art. Summary of the Invention

[0006] The main purpose of the embodiments of the present application is to provide a battery charging method, device, vehicle and storage medium, aiming to solve the problem of poor vehicle battery charging reliability due to the low matching degree between the actual battery temperature and the charging current.

[0007] To achieve the above-mentioned object, an embodiment of the present application provides a battery charging method, the method comprising: obtaining a battery health status, a remaining charge, and a current battery temperature of a vehicle battery when detecting that the vehicle battery needs to be charged;

[0008] Determining a charging current mapping relationship corresponding to the battery health state, wherein the charging current mapping relationship represents a mapping relationship between a preset temperature range and a preset calibrated allowable current under a preset remaining power, and the preset calibrated allowable current is the allowable current in a preset actual temperature range corresponding to the preset temperature range under the preset remaining power;

[0009] A target calibrated allowable current corresponding to both the current battery temperature and the remaining capacity is searched in the charging current mapping relationship, and the vehicle battery is charged according to the target calibrated allowable current.

[0010] In a feasible embodiment, the step of determining the charging current mapping relationship corresponding to the battery health state includes:

[0011] Obtaining mapping relationships of preset charging currents corresponding to battery models of the vehicle battery;

[0012] The charging current mapping relationship corresponding to the battery health state is determined in each of the preset charging current mapping relationships.

[0013] In a feasible embodiment, the step of obtaining the mapping relationship of each preset charging current corresponding to the battery model of the vehicle battery includes:

[0014] Determining a plurality of test battery packs with different preset battery health states, wherein the battery model of each of the test battery packs is the same as the battery model of the vehicle battery;

[0015] For each test battery pack, obtaining temperature test results corresponding to each of the preset remaining capacities after performing cyclic charge and discharge tests on the test battery pack at multiple different preset remaining capacities;

[0016] A preset charging current mapping relationship of the test battery group in the preset battery health state is determined according to the temperature test results corresponding to each of the preset remaining capacities.

[0017] In a feasible embodiment, a plurality of internal temperature sensors are provided inside the test battery pack, and a plurality of external temperature sensors are provided outside the test battery pack, and the temperature test result includes a target temperature difference within a preset temperature range;

[0018] The step of obtaining temperature test results corresponding to each of the preset remaining capacities after performing cyclic charge and discharge tests on the test battery pack at multiple different preset remaining capacities comprises:

[0019] Obtaining an initial charging current mapping relationship for the battery model corresponding to the test battery pack, wherein the initial charging current mapping relationship includes each preset temperature range under each preset remaining power and the initial allowable current corresponding to each preset temperature range;

[0020] For each preset remaining capacity, obtaining the internal and external temperature test data of the battery corresponding to each preset temperature range after the test battery pack performs a cyclic charge and discharge test in each preset temperature range under the preset remaining capacity;

[0021] For each of the preset temperature intervals under the preset remaining power, obtaining internal temperatures respectively detected by a plurality of internal temperature sensors and external temperatures respectively detected by a plurality of external temperature sensors from battery internal and external temperature test data corresponding to both the preset remaining power and the preset temperature interval;

[0022] The temperature difference between each internal temperature and each of the external temperatures is calculated, a maximum temperature difference is determined among the temperature differences, and the maximum temperature difference is used as a target temperature difference in the preset temperature range under a preset remaining power.

[0023] In a feasible embodiment, the step of determining the preset charging current mapping relationship of the test battery pack in the preset battery health state according to the temperature test results of each preset remaining power includes:

[0024] For each preset remaining power temperature test result, determining a target temperature difference corresponding to each preset temperature range from the temperature test result;

[0025] For each of the preset temperature ranges under each of the preset remaining power, based on the target temperature difference corresponding to the preset remaining power and the preset temperature range, adjust the initial allowable current corresponding to the preset temperature range and the preset remaining power in the initial charging current mapping relationship to obtain the preset calibrated allowable current corresponding to the preset temperature range under the preset remaining power.

[0026] In a feasible embodiment, the step of adjusting the initial allowable current corresponding to the preset temperature range and the preset remaining power in the initial charging current mapping relationship based on the target temperature difference corresponding to the preset remaining power and the preset temperature range, and obtaining the preset calibration allowable current corresponding to the preset temperature range under the preset remaining power includes:

[0027] Adjusting the interval boundary value of the preset temperature interval under the preset remaining power according to the target temperature difference corresponding to the preset remaining power and the preset temperature interval to obtain the preset actual temperature interval of the preset temperature interval under the preset remaining power;

[0028] The target initial allowable current corresponding to the preset actual temperature range and the preset remaining power is searched in the initial charging current mapping relationship, and the target initial allowable current is used as the preset calibration allowable current for the preset temperature range under the preset remaining power.

[0029] In a feasible embodiment, the step of searching the initial charging current mapping relationship for a target initial allowable current corresponding to the preset actual temperature range and the preset remaining power, and using the target initial allowable current as the preset calibration allowable current for the preset temperature range under the preset remaining power includes:

[0030] Under the preset remaining capacity, when the number of initial allowable currents corresponding to the preset actual temperature interval in the initial charging current mapping relationship is greater than a preset single threshold, if the maximum temperature of the preset actual temperature interval is greater than a preset high temperature threshold, the target initial allowable current of the maximum temperature of the interval and the preset remaining capacity in the initial charging current mapping relationship is used as the preset calibrated allowable current for the preset temperature interval under the preset remaining capacity;

[0031] If the minimum temperature of the preset actual temperature interval is lower than the preset low temperature threshold, the target initial allowable current of the minimum temperature of the interval and the preset remaining power in the initial charging current mapping relationship is used as the preset calibration allowable current of the preset temperature interval under the preset remaining power.

[0032] Furthermore, to achieve the above-mentioned purpose, an embodiment of the present application provides a battery charging device, the device comprising: an acquisition module for acquiring the battery health status, remaining power, and current battery temperature of the vehicle battery when detecting that the vehicle battery needs to be charged;

[0033] a determination module, configured to determine a charging current mapping relationship corresponding to the battery health state, wherein the charging current mapping relationship represents a mapping relationship between a preset temperature range and a preset calibrated allowable current under a preset remaining capacity, and the preset calibrated allowable current is the allowable current in a preset actual temperature range corresponding to the preset temperature range under the preset remaining capacity;

[0034] The charging module is configured to search the charging current mapping relationship for a target calibrated allowable current corresponding to the current battery temperature and the remaining power, and charge the vehicle battery according to the target calibrated allowable current.

[0035] In addition, to achieve the above-mentioned purpose, an embodiment of the present application also provides a vehicle, which includes: a memory, a processor, and a program of the battery charging method stored in the memory and runnable on the processor. When the program of the battery charging method is executed by the processor, the steps of the battery charging method as described above can be implemented.

[0036] In addition, to achieve the above-mentioned purpose, an embodiment of the present application also provides a computer-readable storage medium, on which a program for implementing the battery charging method is stored. When the program of the battery charging method is executed by a processor, the steps of the battery charging method as described above are implemented.

[0037] In addition, to achieve the above-mentioned purpose, an embodiment of the present application further provides a computer program product, including a computer program, which implements the steps of the battery charging method as described above when executed by a processor.

[0038] One or more technical solutions proposed in the embodiments of the present application have at least the following technical effects: the present application can obtain the battery health status, remaining power and current battery temperature of the vehicle battery when it is detected that the vehicle battery needs to be charged, and then determine the charging current mapping relationship corresponding to the battery health status. That is, the charging current mapping relationship in the present application is related to the battery health status, and the charging current mapping relationship corresponding to different battery health statuses may also be different. For different battery health statuses, the maximum available current supported by the vehicle at the same temperature and the same remaining power may be different. Therefore, the present application determines the charging current mapping relationship through the battery health status, which can improve the matching degree between the charging current mapping relationship and the vehicle battery, and thus facilitates the subsequent improvement of the charging speed, and also facilitates the subsequent reduction of battery fires caused by excessive charging current.

[0039] Furthermore, since the charging current mapping relationship in the present application represents the preset calibrated allowable current corresponding to the preset temperature range under the preset remaining power, and the preset calibrated allowable current is the allowable current of the preset actual temperature range corresponding to the preset temperature range under the preset remaining power, the target calibrated allowable current corresponding to the current battery temperature and the remaining power obtained from the charging current mapping relationship is the allowable current corresponding to the actual battery temperature under the remaining power, thereby improving the charging speed of the vehicle battery, and at the same time, preventing the battery from catching fire due to current mismatch, thereby improving the reliability of vehicle battery charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the embodiments of the present application, and together with the specification are used to explain the principles of the embodiments of the present application.

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 This is a flow chart of an embodiment of a battery charging method according to an embodiment of the present application;

[0043] Figure 2 This is a schematic diagram of a structure in which a temperature sensor is arranged outside a vehicle battery in a battery charging method according to an embodiment of the present application;

[0044] Figure 3 This is a flow chart of an example of a battery charging method according to an embodiment of the present application;

[0045] Figure 4 This is a schematic diagram of the module structure of the battery charging device according to an embodiment of the present application;

[0046] Figure 5 Schematic diagram of the device structure of the hardware operating environment involved in the battery charging method in the embodiment of the present application.

[0047] The purpose, features and advantages of the embodiments of the present application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the embodiments of the present application and are not intended to limit the embodiments of the present application.

[0049] In order to better understand the technical solutions of the embodiments of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0050] With the continuous development and popularization of new energy vehicles, charging time has become one of the most important factors for more and more users when purchasing a vehicle. A fast-charging map is the most fundamental data for designing electric vehicle charging time indicators. The map includes the maximum available current at different battery temperatures. Therefore, developing an accurate map helps maximize battery cell capacity within its capacity range while ensuring cell safety, thereby reducing charging time.

[0051] However, currently, a fixed map is usually used as the charging standard. The real-time temperature collected outside the battery is used to match the corresponding maximum current in the map for fast charging. However, in the actual charging process, it is found that there may be a large temperature difference between the inside and outside of the battery (for example, there will be a large temperature difference between the inside and outside of the battery in a high temperature environment and a low temperature environment), which will cause the detected external battery temperature to not match the actual battery temperature, and then cause the actual battery temperature to not match the corresponding current in the map, which will lead to poor vehicle battery charging reliability. For example, if the matching current is too small, it is easy to cause the vehicle battery to charge too slowly, and if the matching current is too large, it is easy to cause lithium deposition and fire in the battery.

[0052] Therefore, when it is detected that the vehicle battery needs to be charged, the present application can obtain the battery health status, remaining power and current battery temperature of the vehicle battery, and then determine the charging current mapping relationship corresponding to the battery health status. That is, the charging current mapping relationship in the present application is related to the battery health status, and the charging current mapping relationship corresponding to different battery health statuses may also be different. For different battery health statuses, the maximum available current supported by the vehicle at the same temperature and the same remaining power may be different. Therefore, the present application determines the charging current mapping relationship through the battery health status, which can improve the matching degree between the charging current mapping relationship and the vehicle battery, and thus facilitates the subsequent improvement of the charging speed, and also facilitates the subsequent reduction of battery fires caused by excessive charging current.

[0053] Furthermore, since the charging current mapping relationship in the present application represents the preset calibrated allowable current corresponding to the preset temperature range under the preset remaining power, and the preset calibrated allowable current is the allowable current of the preset actual temperature range corresponding to the preset temperature range under the preset remaining power, the target calibrated allowable current corresponding to the current battery temperature and the remaining power obtained from the charging current mapping relationship is the allowable current corresponding to the actual battery temperature under the remaining power, thereby improving the charging speed of the vehicle battery, and at the same time, preventing the battery from catching fire due to current mismatch, thereby improving the reliability of vehicle battery charging.

[0054] Based on this, the embodiment of the present application provides a battery charging method, referring to Figure 1 , Figure 1 This is a flowchart of the first embodiment of the battery charging method of the present application. The battery charging method includes steps S10 to S30:

[0055] Step S10, when it is detected that the vehicle battery needs to be charged, obtaining the battery health status, remaining power and current battery temperature of the vehicle battery;

[0056] It should be noted that the battery health status can reflect the degree of aging of the vehicle battery. In this embodiment, the battery health status can be determined based on parameters such as the number of charge and discharge cycles of the vehicle battery or the capacity retention rate during storage. For example, the vehicle battery can be a lithium-ion battery, which can generally withstand 500 to 1000 cycles. The capacity retention rate refers to the ratio of the battery's current capacity to its rated capacity when it was new. When the battery's capacity drops to 70%-80% of its initial capacity, it is generally considered to be the end of its life. The battery health status can then be determined by the number of charge and discharge cycles and the capacity retention rate. For example, the number of charge and discharge cycles and the storage capacity retention rate can be weighted summed to obtain the vehicle's battery health status. This embodiment does not impose specific limitations on this.

[0057] The remaining charge refers to the current available charge in the vehicle battery. The remaining charge can be expressed as a percentage, for example, as a percentage of the vehicle battery's total capacity. The current battery temperature is detected by a temperature sensor located external to the vehicle battery. The temperature sensor can be an NTC (Negative Temperature Coefficient) thermistor.

[0058] For example, when the vehicle needs to be charged, the battery health status, remaining charge, and current battery temperature can be obtained. Alternatively, the battery health status, remaining charge, and current battery temperature can be obtained upon receiving a power-on signal from the vehicle. A power-on signal is a trigger signal that switches the vehicle from a sleep or power-off state to a power-on standby state. Upon detecting a power-on signal, the remaining charge, current battery temperature, and battery health status can also be directly obtained.

[0059] Step S20: determining a charging current mapping relationship corresponding to the battery health state, wherein the charging current mapping relationship represents a mapping relationship between a preset temperature range and a preset calibrated allowable current at a preset remaining power level, wherein the preset calibrated allowable current is the allowable current in a preset actual temperature range corresponding to the preset temperature range at the preset remaining power level;

[0060] It should be noted that the charging current mapping relationship corresponding to different battery health states is also different. This is because when the battery health state changes, the current that the vehicle battery can carry will also change. Therefore, this embodiment determines the corresponding charging current mapping relationship through the battery health state, which is also convenient for subsequent accurate matching of the corresponding allowable current, so as to subsequently speed up the charging speed, and at the same time will not damage the battery due to excessive current.

[0061] The charging current mapping relationship can represent the mapping relationship between a preset temperature range and a preset calibrated allowable current under a preset remaining power. The charging current mapping relationship may include multiple preset remaining powers, multiple preset temperature ranges, and multiple preset calibrated allowable currents. Under each preset remaining power, multiple preset temperature ranges correspond to the preset calibrated allowable currents corresponding to each of the multiple preset temperature ranges. Different preset remaining powers result in different charging currents supported by the vehicle battery, and different preset temperature ranges result in different charging currents supported by the vehicle battery.

[0062] In the charging current mapping relationship, the preset temperature ranges corresponding to different preset remaining capacities can be the same. Each preset temperature range has its own corresponding preset actual temperature range. The preset actual temperature ranges corresponding to the same preset temperature range under different preset remaining capacities are not necessarily the same.

[0063] The preset actual temperature range of the preset temperature range can be considered to be the temperature range within which the internal temperature of the vehicle battery falls when the external temperature of the vehicle battery falls within the preset temperature range. For example, when the external temperature of the vehicle battery falls within a first temperature range, the internal temperature of the vehicle battery falls within a second temperature range. In this case, the second temperature range is the preset actual temperature range corresponding to the first temperature range, and the first temperature range can be the preset temperature range.

[0064] When the battery is actually used in a vehicle, it is difficult to set a temperature sensor inside the vehicle battery, and thus it is difficult to detect the actual temperature inside the vehicle battery. What can be detected in the vehicle is the temperature outside the vehicle battery, so it will cause the problem of mismatch between the detected temperature and the current. Therefore, this embodiment determines the charging current mapping relationship and calibrates the allowable current corresponding to the preset temperature interval, so that even if the current battery temperature is the temperature outside the vehicle battery, the preset calibrated allowable current of the preset temperature interval is the allowable current of the corresponding preset actual temperature interval, so that the current matched from the charging current mapping relationship matches the temperature inside the vehicle battery, that is, matches the actual temperature of the vehicle battery, which can facilitate the subsequent improvement of charging reliability. For example, to better understand this embodiment, please refer to Figure 2 , Figure 2 The schematic diagram of the structure in which the temperature sensor is arranged on the outside of the vehicle battery is shown in FIG. Figure 2 C1 may refer to a temperature sensor disposed outside the vehicle battery, and D1 may refer to the vehicle battery.

[0065] Exemplarily, a charging current mapping relationship for a vehicle battery is obtained based on the battery health status. The charging current mapping relationship includes, at each preset remaining capacity, multiple preset temperature intervals, and preset calibrated allowable currents corresponding to each of the multiple preset temperature intervals. Specifically, at each preset remaining capacity, each preset temperature interval has a corresponding preset calibrated allowable current, and the preset calibrated allowable current is also the allowable current for the preset actual temperature interval corresponding to the preset temperature interval at the preset remaining capacity. Therefore, the charging current mapping relationship is equivalent to a calibrated charging current mapping relationship, thereby facilitating matching the current found in the charging current mapping relationship with the actual temperature of the vehicle battery.

[0066] Step S30 , searching for a target calibration allowable current corresponding to the current battery temperature and the remaining power in the charging current mapping relationship, and charging the vehicle battery according to the target calibration allowable current.

[0067] It should be noted that the corresponding target calibration allowable current can be found in the charging current mapping relationship based on the detected current battery temperature of the vehicle battery and the remaining power, and the vehicle battery can be charged according to the target calibration allowable current. In addition, in this embodiment, a new target calibration allowable current can be obtained in the charging current mapping relationship in real time based on the detected remaining power and the current battery temperature, so that the corresponding target calibration allowable current can be accurately matched throughout the charging process, so as to improve the overall charging speed of the vehicle battery. The target calibration allowable current is the maximum current that the vehicle battery can be charged at the current battery temperature and remaining power. If the current is too small, the charging speed will be slowed down. If the current is too large, it will exceed the current that the vehicle battery can tolerate, thereby damaging the vehicle battery and posing a risk of battery fire.

[0068] For example, the target calibration allowable current corresponding to the current battery temperature and the remaining power is searched in the charging current mapping relationship, the vehicle battery is charged according to the target calibration allowable current, the remaining power and the changes in the temperature of the vehicle battery are continuously detected, and the target calibration allowable current is adjusted in real time.

[0069] In a feasible embodiment, step S20 further includes steps S21 and S22:

[0070] Step S21, obtaining the preset charging current mapping relationships corresponding to the battery models of the vehicle batteries;

[0071] Step S22 : determining a charging current mapping relationship corresponding to a battery health state from among the preset charging current mapping relationships.

[0072] It should be noted that the same battery model can correspond to multiple preset charging current mapping relationships. In this embodiment, different battery models have their own corresponding preset charging current mapping relationships. For example, a preset charging current mapping relationship corresponding to each battery model is stored in a preset database. Multiple preset charging current mapping relationships corresponding to the same battery model each correspond to a different battery health status. The preset charging current mapping relationship can carry labels for the battery model and battery health status, thereby facilitating the rapid and accurate acquisition of the charging current mapping relationship corresponding to the battery model and battery health status of the vehicle battery.

[0073] Exemplarily, the charging current mapping relationship corresponding to the battery health status can be obtained from each preset charging current mapping relationship corresponding to the battery model of the vehicle battery. The preset charging current mapping relationship is different for different battery health states. The preset charging current mapping relationship also includes preset calibrated allowable currents corresponding to multiple preset temperature intervals under each preset remaining power. For each preset charging current mapping relationship of the same battery model, there may be the same preset remaining power and preset temperature interval, but the preset calibrated allowable currents under the same preset remaining power and the same preset temperature interval may be different, because the preset charging current mapping relationships are different and the corresponding battery health states are different, and thus under the same preset remaining power and preset temperature interval, the maximum current that the vehicle battery can tolerate may not be the same.

[0074] In a feasible embodiment, step S21 further includes steps S211 to S213:

[0075] Step S211, determining a plurality of test battery packs with different preset battery health states, wherein the battery model of each test battery pack is the same as the battery model of the vehicle battery;

[0076] It should be noted that the battery model of the test battery pack can be the same as the battery model of the vehicle battery, and thus the preset charging current mapping relationships corresponding to the vehicle batteries can be determined using the test battery pack. Multiple test battery packs with different preset battery health states can be set to facilitate determining the preset charging current mapping relationships corresponding to each of the multiple preset battery health states.

[0077] Each test battery pack can include multiple battery cells connected in series. A temperature sensor can be installed inside the battery cells of each test battery pack. During the production process, the temperature sensor can be embedded inside the battery cells. Each battery cell in the test battery pack can be installed with multiple temperature sensors to detect the temperature inside the battery cell. Temperature sensors can also be installed outside the battery cell housing in the test battery pack to detect the temperature outside the battery cell housing. This facilitates detecting the temperature outside the battery cell housing. Multiple temperature sensors can also be installed outside the battery cell housing. Since the test battery pack is used for testing in this embodiment, the test battery pack can be used outside of an actual vehicle. This makes it convenient to install temperature sensors inside the battery cells of the test battery pack while simulating the corresponding battery model and the corresponding preset battery health status through the test battery pack. However, in actual use, the vehicle battery needs to support vehicle operation. To ensure safety, it is difficult to install temperature sensors inside the battery cells of the vehicle battery and to transmit data collected by the temperature sensors to the outside. This makes it difficult to install temperature sensors inside the battery cells of the vehicle battery. However, the test battery pack is only used for simulation testing, so a temperature sensor can be set inside the test battery pack, and the temperature signal detected by the internal temperature sensor can also be transmitted to the outside.

[0078] Furthermore, before determining the test battery pack, a simulation can be performed to ensure the feasibility of subsequent testing of the test battery pack and thereby reduce testing costs. For example, a simulation model can be built, including a single-cell internal and external temperature difference simulation model and a battery pack operating condition simulation model. The single-cell internal and external temperature difference simulation model can be used to simulate the internal and external temperatures of a single cell. For example, temperature points can be placed inside the cell, in the top, middle, bottom, left, and right corners, and on the outside of the cell. The battery pack operating condition simulation model can be used to simulate the overall temperature of the battery. Simulation operating conditions can then be set, for example, common operating conditions such as CLTC, high-temperature fast charging, high-speed driving, and low-temperature fast charging. Simulations can then be performed at different temperatures and operating conditions. For example, in the high-temperature region, operating condition simulations can be performed at 5°C intervals between 30°C and 50°C, and in the low-temperature region, operating condition simulations can be performed at 5°C intervals between -30°C and -10°C. Simulation data can then be obtained. The simulation data can include simulated internal and external temperature data of the cell, etc. This is not specifically limited in this embodiment. The test battery pack can then be tested after the simulation to ensure the accuracy of the test battery test, and can also reduce the test battery pack being scrapped due to testing in unreasonable environments, thereby increasing the test cost.

[0079] In other embodiments, different battery models may have corresponding multiple test battery packs, thereby facilitating determination of preset charging current mapping relationships corresponding to the multiple battery models.

[0080] For example, a plurality of test battery packs having the same battery model as the vehicle battery but with different preset battery health states may be determined.

[0081] Step S212, for each test battery pack, obtaining temperature test results corresponding to each preset remaining capacity after performing cyclic charge and discharge tests on the test battery pack at multiple different preset remaining capacities;

[0082] It should be noted that the cyclic charge-discharge test simulates the charge and discharge process of a vehicle battery at different preset remaining capacities. Each test battery pack has multiple corresponding temperature test results. For the same test battery pack, multiple preset remaining capacities have their own corresponding temperature test results. The temperature test results can reflect the temperature changes of the test battery pack during the charge and discharge process.

[0083] For example, for each test battery pack, a cyclic charge and discharge test can be performed on the test battery pack at each preset remaining power level to obtain a temperature test result for each preset remaining power level, thereby facilitating the acquisition of multiple temperature test results under the preset battery health state corresponding to the test battery pack, thereby facilitating the subsequent determination of the preset charging current mapping relationship under the preset battery health state.

[0084] In a feasible embodiment, a plurality of internal temperature sensors are provided inside the test battery pack, and a plurality of external temperature sensors are provided outside the test battery pack. The temperature test result includes a target temperature difference within a preset temperature range. Step S212 includes steps A10 to A40:

[0085] Step A10: Obtaining an initial charging current mapping relationship for the battery model corresponding to the test battery pack, wherein the initial charging current mapping relationship includes each preset remaining power level, each preset temperature range, and the initial allowable current corresponding to each preset temperature range;

[0086] It should be noted that the internal temperature sensor is a temperature sensor arranged inside the battery cell shell of the test battery pack, and the external temperature sensor is a temperature sensor arranged outside the battery cell shell of the test battery pack. There can be multiple internal temperature sensors and external temperature sensors. The initial charging current mapping relationship can be the original map of the battery model corresponding to the test battery pack, and the original map corresponding to different battery models is also different. In the initial charging current mapping relationship, under each preset remaining power, each preset temperature range and each preset temperature range respectively correspond to the initial allowable current. The initial allowable current is the allowable current corresponding to the preset remaining power and the preset temperature range in the initial charging current mapping relationship.

[0087] For example, the preset remaining power in the initial charging current mapping relationship can be 0, 5%, 10%, 15%, and so on, and so on to 100%, and the preset temperature ranges can be -20 to -15, -15 to 10, and so on, and so on to 50 to 55. This embodiment does not impose specific restrictions on the preset remaining power and preset temperature ranges. The above examples are provided for ease of understanding and do not limit the preset remaining power and preset temperature ranges.

[0088] Step A20, for each preset remaining power, obtaining test data of the internal and external temperatures of the battery corresponding to each preset temperature range after the test battery pack performs a cyclic charge and discharge test in each preset temperature range under the preset remaining power;

[0089] Step A30, for each preset temperature range under a preset remaining power, obtaining internal temperatures respectively detected by the plurality of internal temperature sensors and external temperatures respectively detected by the plurality of external temperature sensors from the battery internal and external temperature test data corresponding to both the preset remaining power and the preset temperature range;

[0090] Step A40 , calculating the temperature difference between each internal temperature and each external temperature, determining the maximum temperature difference among the temperature differences, and using the maximum temperature difference as the target temperature difference of the preset temperature range under the preset remaining power.

[0091] It should be noted that under the same preset remaining power, different preset temperature ranges have their own corresponding battery internal and external temperature test data. The battery internal and external temperature test data can reflect the internal and external temperatures of the test battery pack during charging and discharging under the preset remaining power and preset temperature range. There are multiple internal temperatures and external temperatures. The temperature difference is the absolute value of the difference between the internal temperature and the external temperature. The temperature difference between each internal temperature and each external temperature can be calculated, and then the maximum temperature difference can be determined, and the maximum temperature difference is used as the target temperature difference corresponding to the preset temperature range and the preset remaining power. This facilitates the subsequent use of the target temperature difference to compensate for the preset temperature range under the preset remaining power, so that the preset calibration allowable current of the preset temperature range can be determined.

[0092] Exemplarily, for each preset remaining capacity, the test battery pack is subjected to multiple cycle charge and discharge tests at the preset remaining capacity. For example, the cycle charge and discharge tests can be performed separately at preset temperature intervals to obtain the battery internal and external temperature test data corresponding to each preset temperature interval at the preset remaining capacity. Then, for each preset temperature interval at each preset remaining capacity, multiple internal and external temperatures are obtained from the battery internal and external temperature test data in the preset temperature interval. The temperature difference between each internal temperature and each external temperature is calculated, and the maximum temperature difference is determined among the temperature differences. The maximum temperature difference is used as the target temperature difference for the preset temperature interval at the preset remaining capacity. Since the maximum temperature difference is used as the target temperature difference instead of determining the average temperature difference as the target temperature difference, it is possible to avoid the average temperature difference averaging out the maximum temperature difference, and thus it is possible to avoid the target temperature difference being too small, which results in the preset calibration current being too large, thereby facilitating the improvement of the safety of the vehicle battery.

[0093] In step S213 , a preset charging current mapping relationship of the test battery pack in a preset battery health state is determined according to the temperature test results corresponding to each preset remaining power level.

[0094] It should be noted that for any test battery pack with a preset battery health status, there are multiple temperature test results corresponding to each preset remaining power, which makes it easy to determine the preset charging current mapping relationship under the preset battery health status based on the multiple temperature test results of the preset remaining power.

[0095] For example, the initial charging current mapping relationship can be adjusted based on the temperature test results corresponding to each preset residual power, so as to obtain the preset charging current mapping relationship of the test battery pack in the preset battery health state. For example, the initial charging current corresponding to the preset residual power and the preset temperature range in the initial charging current mapping relationship is adjusted, and the preset residual power and the preset temperature range can be left unchanged. It can be understood that compared with the preset charging current mapping relationship, the multiple preset residual powers and the multiple preset temperature ranges of the initial charging current mapping relationship can be the same as the multiple preset residual currents and the multiple preset temperature ranges in the preset charging current mapping relationship, but in the initial charging current mapping relationship, the same preset residual power and preset temperature range correspond to the initial allowable current, while in the preset charging current mapping relationship, the corresponding current is the preset calibration allowable current, and the initial allowable current and the preset calibration allowable current are not necessarily the same.

[0096] In a feasible embodiment, step S213 further includes steps B10 to B20:

[0097] Step B10, for each preset remaining power temperature test result, determining a target temperature difference corresponding to each preset temperature range from the temperature test result;

[0098] Step B20, for each preset temperature range under each preset remaining power, adjust the initial allowable current corresponding to the preset temperature range and the preset remaining power in the initial charging current mapping relationship according to the target temperature difference corresponding to the preset remaining power and the preset temperature range, and obtain the preset calibrated allowable current corresponding to the preset temperature range under the preset remaining power.

[0099] It should be noted that there may be multiple temperature test results under the same preset remaining power. The temperature test results under the same preset remaining power respectively correspond to different preset temperature ranges, and the corresponding target temperature differences may be the same or different.

[0100] For the same preset temperature range, if the preset remaining capacity is different, the corresponding target temperature difference may also be different. Therefore, the initial allowable current corresponding to the preset temperature range is adjusted based on the mapping relationship between the target temperature difference and the initial charging current of the preset temperature range under the preset remaining capacity, thereby obtaining the preset calibrated allowable current corresponding to the preset temperature range under the preset remaining capacity. This ensures that the preset calibrated allowable current reflects the allowable current corresponding to the actual battery temperature, improving the reliability of vehicle battery charging.

[0101] For example, each preset remaining capacity has corresponding multiple preset temperature intervals. The multiple preset temperature intervals corresponding to different preset remaining capacities can be the same, but the target temperature differences for the same preset temperature interval at different preset remaining capacities may be different or the same. This is determined based on the temperature test results and is not specifically limited in this embodiment. The initial allowable current in the initial charging current mapping relationship for the preset temperature interval at the preset remaining capacity can be adjusted based on the target temperature difference corresponding to both the preset remaining capacity and the preset temperature interval, thereby obtaining a preset calibrated allowable current for the preset temperature interval at the preset remaining capacity.

[0102] Furthermore, this embodiment determines a preset calibrated allowable current corresponding to each preset temperature range at each preset remaining capacity, thereby facilitating improved accuracy of the preset charging current mapping relationship. Furthermore, the complexity of adjusting the initial charging current mapping relationship is reduced. By adjusting the initial allowable current in the initial charging current mapping relationship without adjusting the corresponding preset remaining capacity and preset temperature range, it is facilitated to achieve that, even if the temperature outside the battery is detected, the target calibrated allowable current found in the charging current mapping relationship corresponding to the vehicle battery is the current corresponding to the actual battery temperature, thereby improving battery charging reliability and reducing the complexity of matching temperature and current.

[0103] In a feasible embodiment, step B20 further includes steps B21 and B22:

[0104] Step B21, adjusting the interval boundary value of the preset temperature interval under the preset remaining power according to the target temperature difference corresponding to the preset remaining power and the preset temperature interval, to obtain a preset actual temperature interval of the preset temperature interval under the preset remaining power;

[0105] Step B22: searching the initial charging current mapping relationship for a target initial allowable current corresponding to the preset actual temperature range and the preset remaining capacity, and using the target initial allowable current as the preset calibration allowable current for the preset temperature range under the preset remaining capacity.

[0106] It should be noted that the boundary values of the preset temperature range include a maximum boundary value and a minimum boundary value, which can be adjusted based on the target temperature difference. The preset actual temperature range corresponding to the same preset temperature range under different preset remaining power levels may not be the same, and the corresponding preset calibrated allowable current may not be the same. The preset actual temperature range can be considered as the range after temperature compensation is performed on the preset temperature range.

[0107] Since the target temperature difference is the maximum temperature difference between the inside and outside of the test battery pack, and the preset temperature interval is compensated by the target temperature difference, the preset actual temperature interval obtained is the temperature interval corresponding to the actual temperature of the battery, and the target initial allowable current corresponding to the preset actual temperature interval can be used as the preset calibration allowable current of the preset temperature interval. For example, the interval boundary value of the preset temperature interval under the preset remaining power can be increased based on the target temperature difference corresponding to the preset remaining power and the preset temperature interval. Because the temperature inside the battery is generally higher than the temperature outside the battery. Therefore, the interval boundary value of the preset temperature interval can be increased so that the preset actual temperature interval can reflect the actual temperature of the battery. Then, the target calibration allowable current found in the charging current mapping relationship corresponding to the vehicle battery using the detected temperature outside the vehicle battery is the allowable current corresponding to the actual temperature of the vehicle battery, thereby facilitating the improvement of the reliability of vehicle battery charging.

[0108] Exemplarily, based on the target temperature difference corresponding to the preset remaining power and the preset temperature range, the interval boundary value of the preset temperature range under the preset remaining power is increased to obtain the preset actual temperature range of the preset temperature range under the preset remaining power; for example, the maximum value of the boundary can be added to the target temperature difference, and the minimum value of the boundary can be added to the target temperature difference, so as to obtain the preset actual temperature range; then, the target initial allowable current corresponding to the preset actual temperature range under the preset remaining power is searched in the initial charging current mapping relationship, and the target initial allowable current is used as the preset calibration allowable current of the preset temperature range under the preset remaining power. For example, when the preset remaining power is 30%, taking the preset temperature range as [0°C, 5°C] as an example, if the target temperature difference obtained under the preset temperature range of [0°C, 5°C] is 5°C, then the preset actual temperature range of [0°C, 5°C] is [5°C, 10°C], then the allowable current of [5°C, 10°C] in the initial charging current mapping relationship needs to be used as the preset calibration allowable current of [0°C, 5°C].

[0109] In a feasible embodiment, step B22 further includes steps B221 and B222:

[0110] Step B221: When the number of initial allowable currents corresponding to the preset actual temperature intervals in the initial charging current mapping relationship is greater than a preset single threshold value under a preset remaining capacity, and if the maximum temperature of the preset actual temperature interval is greater than a preset high temperature threshold value, the target initial allowable current corresponding to the maximum temperature of the interval and the preset remaining capacity in the initial charging current mapping relationship is used as the preset calibration allowable current for the preset temperature interval under the preset remaining capacity;

[0111] It should be noted that the preset single threshold value can be 1. When, under the preset remaining power, the number of initial allowable currents corresponding to the preset actual temperature range in the initial charging current mapping relationship is greater than the preset single threshold value, it means that under the preset remaining power, the preset actual temperature range spans two preset temperature ranges in the initial temperature current. Therefore, under the preset remaining power, the number of initial allowable currents corresponding to the preset actual temperature range will be greater than the preset single threshold value.

[0112] At this time, a target initial allowable current can be determined from the two initial allowable currents based on the temperature of the preset actual temperature range. The maximum temperature of the interval is the maximum value of the interval boundary in the preset actual temperature range, and the minimum temperature of the interval is the minimum value of the interval boundary in the preset actual temperature range.

[0113] For example, if the maximum temperature of a preset actual temperature interval is greater than a preset high temperature threshold, it indicates that the preset actual temperature interval may be in a high temperature region. In a high temperature region, the higher the temperature, the lower the current that the vehicle battery can tolerate. Therefore, it is necessary to determine the target initial allowable current in the initial charging current mapping relationship for the maximum temperature of the interval under a preset remaining power, and use this as the preset calibrated allowable current for the preset temperature interval under the preset remaining power. This can prevent battery lithium deposition and fire caused by excessive current, thereby improving battery charging safety.

[0114] In step B222, if the minimum temperature of the preset actual temperature interval is lower than the preset low temperature threshold, the target initial allowable current of the minimum temperature of the interval and the preset remaining power in the initial charging current mapping relationship is used as the preset calibration allowable current of the preset temperature interval under the preset remaining power.

[0115] It should be noted that, under the preset remaining power, when the number of initial allowable currents corresponding to the preset actual temperature range in the initial charging current mapping relationship is greater than the preset single threshold, if the minimum temperature of the preset actual temperature range is less than the preset low temperature threshold, it means that the preset actual range may be in a low temperature area. In the low temperature area, the lower the temperature, the smaller the charging current that the vehicle battery can tolerate. Therefore, it is necessary to determine the target initial allowable current in the initial charging current mapping relationship for the minimum temperature of the range under the preset remaining power, as the preset calibrated allowable current for the preset temperature range under the preset remaining power, thereby facilitating the improvement of the safety of battery charging.

[0116] In this embodiment, the low temperature area and the high temperature area can be determined based on actual conditions, and this embodiment does not make specific limitations on this. The preset high temperature threshold and the preset low temperature threshold can also be determined based on actual conditions, and this embodiment does not make specific limitations on this.

[0117] Under the preset remaining capacity, when the number of initial allowable currents corresponding to the preset actual temperature interval in the initial charging current mapping relationship is greater than a preset single threshold value, the minimum temperature of the preset actual temperature interval is greater than or equal to the preset low temperature threshold value, and the maximum temperature of the preset actual temperature interval is less than or equal to the preset high temperature threshold value, the target initial allowable current of the interval minimum temperature and the preset remaining capacity in the initial charging current mapping relationship can be used as the preset calibration allowable current of the preset temperature interval under the preset remaining capacity, or the target initial allowable current of the interval maximum temperature and the preset remaining capacity in the initial charging current mapping relationship can be used as the preset calibration allowable current of the preset temperature interval under the preset remaining capacity. This embodiment does not make specific restrictions on this. Because when the minimum temperature of the preset actual temperature interval is greater than or equal to the preset low temperature threshold value, and the maximum temperature of the preset actual temperature interval is less than or equal to the preset high temperature threshold value, it means that the temperature is moderate and the difference between the two initial allowable currents is not large, so either one can be selected as the preset calibration allowable current.

[0118] Under the preset remaining power, when the number of initial allowable currents corresponding to the preset actual temperature range in the initial charging current mapping relationship is equal to the preset single threshold, the initial allowable current is used as the target initial allowable current, and the target initial allowable current is used as the preset calibration allowable current for the preset temperature range.

[0119] In this embodiment, multiple test resistor groups with different preset battery health states are tested, thereby obtaining preset charging current mapping relationships corresponding to different preset battery health states. This facilitates the vehicle battery to obtain a charging current mapping relationship that matches its own battery health state, thereby matching the most appropriate allowable current, thereby increasing charging speed and preventing lithium deposition fires caused by excessive current.

[0120] In addition, to better understand this embodiment, you can also refer to Figure 3 ,pass Figure 3The process of this embodiment is briefly described as follows: Step a1 obtains an initial charging current mapping relationship. Step a2 modifies the initial charging current mapping relationship based on the internal and external temperature difference data under a preset battery health state to obtain a preset charging current mapping relationship under the preset battery health state. The internal and external temperature difference data refers to the various temperature test results under the preset battery health state. Furthermore, in other embodiments, step a3 may be performed to fine-tune the preset charging current mapping relationship, such as by determining a preset discount factor. The preset calibration current in the preset charging current mapping relationship may be multiplied by the preset discount factor, thereby facilitating improving the accuracy of the preset charging current mapping relationship. This is because the temperature test results obtained during the battery pack test reflect the internal and external temperatures of each battery cell. When the battery cells are connected in series to form a complete battery pack, the battery cells will also affect each other, and the internal temperature may also vary slightly. Therefore, fine-tuning the preset charging current relationship using the preset discount factor helps improve accuracy.

[0121] In addition, to facilitate understanding of the preset charging current mapping relationship in this embodiment, please refer to Table 1, which shows the preset charging current mapping relationship under a preset battery health state.

[0122] Table 1:

[0123]

[0124]

[0125] Among them, SOC can refer to a preset remaining capacity, for example, each preset remaining capacity can be 0%, 5%, 10%, etc., and so on to 95%, 100%, etc., A can refer to a preset calibrated allowable current, and each preset calibrated allowable current can be a11~a44, etc. For example, a11 can be 10 amperes, a43 can be 70 amperes, etc., T can refer to a preset temperature range, t can be a temperature, for example, each preset temperature range can be -20≤t<-15, -15≤t<-10, and so on to 45≤t<50, 50≤t<55, etc. This embodiment does not make specific restrictions on this. Therefore, in the same preset charging current relationship, the same preset remaining capacity will correspond to multiple preset calibrated allowable currents, the same preset temperature range will also correspond to multiple preset calibrated allowable currents, and the same preset remaining capacity and the same preset temperature range can correspond to one preset calibrated allowable current.

[0126] The present application also provides a battery charging device, please refer to Figure 4 , the device comprises:

[0127] The acquisition module 10 is used to obtain the battery health status, remaining power and current battery temperature of the vehicle battery when it is detected that the vehicle battery needs to be charged;

[0128] a determination module 20 for determining a charging current mapping relationship corresponding to a battery health state, wherein the charging current mapping relationship represents a mapping relationship between a preset temperature range and a preset calibrated allowable current at a preset remaining capacity, wherein the preset calibrated allowable current is the allowable current in a preset actual temperature range corresponding to the preset temperature range at the preset remaining capacity;

[0129] The charging module 30 is used to search for a target calibrated allowable current corresponding to the current battery temperature and the remaining power in the charging current mapping relationship, and charge the vehicle battery according to the target calibrated allowable current.

[0130] The battery charging device provided in the embodiments of this application utilizes the battery charging method described in the aforementioned embodiments, aiming to address the issue of poor vehicle battery charging reliability caused by a poor match between the actual battery temperature and the charging current. Compared to the prior art, the battery charging method provided in the embodiments of this application achieves the same beneficial effects as those provided in the aforementioned embodiments. Other technical features of the battery charging device are the same as those disclosed in the aforementioned embodiments and are not further elaborated here.

[0131] The present application provides a vehicle, which includes a vehicle body, a vehicle battery and a controller. The controller and the vehicle battery are both arranged in the vehicle body. The controller includes at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery charging method in the above-mentioned embodiment one.

[0132] Reference below Figure 5 , which shows a schematic diagram of the structure of a vehicle suitable for implementing the embodiments of the present application. The controller in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The vehicle shown is merely an example and should not limit the functionality and scope of use of the embodiments of the present application.

[0133] like Figure 5As shown, the vehicle may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory 1002 or programs loaded from a storage device 1003 into a random access memory 1004. Random access memory 1004 also stores various programs and data required for vehicle operation. Processing device 1001, read-only memory 1002, and random access memory 1004 are interconnected via a bus 1005. An input / output interface 1006 is also connected to the bus. Typically, the following systems may be connected to input / output interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speakers, and vibrator; storage device 1003 including, for example, a magnetic tape or hard disk; and communication device 1009. Communication device 1009 may allow the vehicle to communicate with other devices wirelessly or by wire to exchange data. Although the figures show a vehicle with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0134] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are performed.

[0135] The vehicle provided in this application utilizes the battery charging method of the aforementioned embodiment, resolving the issue of poor battery charging reliability in vehicles due to a poor match between the actual battery temperature and the charging current. Compared to the prior art, the vehicle provided in this application achieves the same beneficial effects as the battery charging method of the aforementioned embodiment. Other technical features of the vehicle are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0136] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0137] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0138] This embodiment provides a computer-readable storage medium having computer-readable program instructions stored thereon, and the computer-readable program instructions are used to execute the battery charging method in the above-mentioned embodiment 1.

[0139] The computer-readable storage medium provided in the embodiment of the present application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor devices, equipment or devices, or any combination thereof. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable EPROM (Electrical Programmable Read Only Memory, read-only memory) or flash memory, an optical fiber, a portable compact disk CD-ROM (compact discread-only memory, read-only memory), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in combination with an instruction execution device, device or device. The program code contained on the computer-readable storage medium can be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency, radio frequency) and the like, or any suitable combination thereof.

[0140] The computer-readable storage medium may be included in the vehicle, or may exist independently without being installed in the vehicle.

[0141] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the vehicle, the vehicle: obtains the battery health status, remaining power and current battery temperature of the vehicle battery when it is detected that the vehicle battery needs to be charged; determines the charging current mapping relationship corresponding to the battery health status, wherein the charging current mapping relationship represents the mapping relationship between the preset temperature range and the preset calibrated allowable current under the preset remaining power, and the preset calibrated allowable current is the allowable current of the preset actual temperature range corresponding to the preset temperature range under the preset remaining power; searches for the target calibrated allowable current corresponding to the current battery temperature and the remaining power in the charging current mapping relationship, and charges the vehicle battery according to the target calibrated allowable current.

[0142] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a LAN (local area network) or WAN (wide area network), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0143] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the equipment, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based device that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0144] The modules involved in the embodiments described in this disclosure may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0145] The computer-readable storage medium provided in the embodiments of this application stores computer-readable program instructions for executing the aforementioned battery charging method, aiming to address the issue of poor charging reliability in vehicle batteries due to a poor match between the actual battery temperature and the charging current. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in the embodiments of this application are the same as those of the battery charging method provided in the aforementioned embodiments, and are not further elaborated here.

[0146] An embodiment of the present application further provides a computer program product, including a computer program, which implements the steps of the above-mentioned battery charging method when executed by a processor.

[0147] The computer program product provided in the embodiments of this application is intended to address the problem of poor vehicle battery charging reliability caused by a poor match between the actual battery temperature and the charging current. Compared to the prior art, the beneficial effects of the computer program product provided in the embodiments of this application are the same as those of the battery charging method provided in the aforementioned embodiments, and are not further elaborated here.

[0148] The above are only preferred embodiments of the embodiments of the present application, and do not limit the patent scope of the embodiments of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of the embodiments of the present application, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the embodiments of the present application.

Claims

1. A battery charging method, characterized in that: The method includes: When it is detected that the vehicle battery needs to be charged, the battery health status, remaining power and current battery temperature of the vehicle battery are obtained; Determining a charging current mapping relationship corresponding to the battery health state, wherein the charging current mapping relationship represents a mapping relationship between a preset temperature range and a preset calibrated allowable current under a preset remaining power, and the preset calibrated allowable current is the allowable current in a preset actual temperature range corresponding to the preset temperature range under the preset remaining power; A target calibrated allowable current corresponding to both the current battery temperature and the remaining capacity is searched in the charging current mapping relationship, and the vehicle battery is charged according to the target calibrated allowable current.

2. The battery charging method according to claim 1, wherein: The step of determining the charging current mapping relationship corresponding to the battery health state includes: Obtaining mapping relationships of preset charging currents corresponding to battery models of the vehicle battery; The charging current mapping relationship corresponding to the battery health state is determined in each of the preset charging current mapping relationships.

3. The battery charging method according to claim 2, wherein: The step of obtaining the preset charging current mapping relationships corresponding to the battery models of the vehicle battery includes: Determining a plurality of test battery packs with different preset battery health states, wherein the battery model of each of the test battery packs is the same as the battery model of the vehicle battery; For each test battery pack, obtaining temperature test results corresponding to each of the preset remaining capacities after performing cyclic charge and discharge tests on the test battery pack at multiple different preset remaining capacities; According to the temperature test results respectively corresponding to the preset remaining capacities, a preset charging current mapping relationship of the test battery group in the preset battery health state is determined.

4. The battery charging method according to claim 3, wherein: A plurality of internal temperature sensors are provided inside the test battery pack, and a plurality of external temperature sensors are provided outside the test battery pack, and the temperature test result includes a target temperature difference within a preset temperature range; The step of obtaining temperature test results corresponding to each of the preset remaining capacities after performing cyclic charge and discharge tests on the test battery pack at multiple different preset remaining capacities comprises: Obtaining an initial charging current mapping relationship for the battery model corresponding to the test battery pack, wherein the initial charging current mapping relationship includes each preset temperature range under each preset remaining power and the initial allowable current corresponding to each preset temperature range; For each preset remaining capacity, obtaining the internal and external temperature test data of the battery corresponding to each preset temperature range after the test battery pack performs a cyclic charge and discharge test in each preset temperature range under the preset remaining capacity; For each of the preset temperature intervals under the preset remaining power, obtaining internal temperatures respectively detected by a plurality of internal temperature sensors and external temperatures respectively detected by a plurality of external temperature sensors from battery internal and external temperature test data corresponding to both the preset remaining power and the preset temperature interval; The temperature difference between each internal temperature and each of the external temperatures is calculated, a maximum temperature difference is determined among the temperature differences, and the maximum temperature difference is used as a target temperature difference in the preset temperature range under a preset remaining power.

5. The battery charging method according to claim 3, wherein: The step of determining the preset charging current mapping relationship of the test battery pack in the preset battery health state according to the temperature test results of each preset remaining power includes: For each preset remaining power temperature test result, determining a target temperature difference corresponding to each preset temperature range from the temperature test result; For each of the preset temperature ranges under each of the preset remaining power, based on the target temperature difference corresponding to the preset remaining power and the preset temperature range, adjust the initial allowable current corresponding to the preset temperature range and the preset remaining power in the initial charging current mapping relationship to obtain the preset calibrated allowable current corresponding to the preset temperature range under the preset remaining power.

6. The battery charging method according to claim 5, wherein: The step of adjusting the initial allowable current corresponding to the preset temperature range and the preset remaining capacity in the initial charging current mapping relationship based on the target temperature difference corresponding to the preset remaining capacity and the preset temperature range to obtain the preset calibration allowable current corresponding to the preset temperature range under the preset remaining capacity includes: Adjusting the interval boundary value of the preset temperature interval under the preset remaining power according to the target temperature difference corresponding to the preset remaining power and the preset temperature interval to obtain the preset actual temperature interval of the preset temperature interval under the preset remaining power; The target initial allowable current corresponding to the preset actual temperature range and the preset remaining power is searched in the initial charging current mapping relationship, and the target initial allowable current is used as the preset calibration allowable current for the preset temperature range under the preset remaining power.

7. The battery charging method according to claim 6, wherein: The step of searching for a target initial allowable current corresponding to both the preset actual temperature range and the preset remaining capacity in the initial charging current mapping relationship, and using the target initial allowable current as a preset calibration allowable current for the preset temperature range under the preset remaining capacity includes: Under the preset remaining capacity, when the number of initial allowable currents corresponding to the preset actual temperature interval in the initial charging current mapping relationship is greater than a preset single threshold, if the maximum temperature of the preset actual temperature interval is greater than a preset high temperature threshold, the target initial allowable current of the maximum temperature of the interval and the preset remaining capacity in the initial charging current mapping relationship is used as the preset calibrated allowable current for the preset temperature interval under the preset remaining capacity; If the minimum temperature of the preset actual temperature interval is lower than the preset low temperature threshold, the target initial allowable current of the minimum temperature of the interval and the preset remaining power in the initial charging current mapping relationship is used as the preset calibration allowable current of the preset temperature interval under the preset remaining power.

8. A battery charging device, characterized in that: The device comprises: An acquisition module is used to obtain the battery health status, remaining power and current battery temperature of the vehicle battery when it is detected that the vehicle battery needs to be charged; a determination module, configured to determine a charging current mapping relationship corresponding to the battery health state, wherein the charging current mapping relationship represents a mapping relationship between a preset temperature range and a preset calibrated allowable current under a preset remaining capacity, and the preset calibrated allowable current is the allowable current in a preset actual temperature range corresponding to the preset temperature range under the preset remaining capacity; The charging module is configured to search the charging current mapping relationship for a target calibrated allowable current corresponding to the current battery temperature and the remaining power, and charge the vehicle battery according to the target calibrated allowable current.

9. A vehicle, characterized in that: The vehicle includes a vehicle body, a vehicle battery, and a controller. The controller and the vehicle battery are both provided in the vehicle body. The controller is used to execute the steps of implementing the battery charging method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, on which a program for implementing the battery charging method is stored. The program for implementing the battery charging method is executed by a processor to implement the steps of the battery charging method according to any one of claims 1 to 7.

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