Battery charging control method and system, and storage medium

Abstract

Provided in the present application are a battery charging control method and system, and a storage medium. The method comprises: first, acquiring the current surface temperature of a battery to be tested; on the basis of a preset temperature mapping model, processing the current surface temperature to obtain a compensation temperature corresponding to the current surface temperature; on the basis of the compensation temperature and the current surface temperature, obtaining a target temperature corresponding to said battery; and on the basis of a preset rate mapping model, processing the target temperature to obtain a target charging rate corresponding to said battery, so as to control the charging of said battery.

Description

Battery charging control method, system and storage medium

[0001] The present application claims priority to the Chinese patent application No. 2024110408260, filed on July 30, 2024, to the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a battery charging control method, system and storage medium. BACKGROUND

[0003] The battery is used as the main energy output source and storage device of the electrical equipment, for example, the battery can be used as the power source and energy carrier of the new energy vehicle, and bears the functions of vehicle acceleration, vehicle speed maintenance, energy recovery, etc. A temperature probe is usually arranged on the surface of the pole or cover plate of the battery, and the surface temperature of the battery is detected through the temperature probe. TECHNICAL PROBLEM

[0004] At present, when the battery is used at a large rate such as 4C or 5C, the surface temperature of the battery will rapidly increase, but the internal temperature of the battery is usually lower than the surface temperature of the battery at this time, so that the temperature detected by the temperature probe presents a false high phenomenon during fast charging. The charging rate of the battery usually jumps with the surface temperature of the battery, for example, when the surface temperature of the battery exceeds a certain range, it will jump to a smaller charging rate, that is, the charging rate is reduced with the increase of the surface temperature of the battery during fast charging, which prolongs the charging time. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a battery charging control method, comprising the following steps:

[0006] obtaining a current surface temperature of a battery to be measured;

[0007] processing the current surface temperature based on a preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature;

[0008] obtaining a target temperature corresponding to the battery to be measured according to the compensation temperature and the current surface temperature;

[0009] processing the target temperature based on a preset rate mapping model to obtain a target charging rate corresponding to the battery to be measured, and controlling the charging of the battery to be measured based on the target charging rate.

[0010] In a second aspect, the present application provides a battery charging control system, comprising a processing device connected to a battery to be measured.

[0011] The processing device is configured to perform the steps of the battery charging control method provided by any one of the present application.

[0012] Thirdly, this application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of any of the battery charging control methods provided in this application. Beneficial effects

[0013] The beneficial effects of the battery charging control method, system, and storage medium provided in this application are as follows: The current surface temperature of the battery under test is obtained; the current surface temperature is processed based on a preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature; the target temperature of the battery under test is obtained based on the compensation temperature and the current surface temperature; the target temperature is processed based on a preset rate mapping model to obtain the target charging rate of the battery under test, thereby controlling the charging of the battery under test based on the target charging rate, achieving fast charging of the battery under test, and improving the fast charging efficiency of the battery under test. This application calculates the compensation temperature of the battery under test and obtains the target temperature through the compensation temperature, then adjusts the charging rate of the battery under test according to the target temperature to obtain the target charging rate of the battery under test. Thus, the battery under test is charged based on the target charging rate, realizing that the charging rate of the battery under test jumps accordingly with the change of the target temperature, reducing the extended charging time caused by falsely high surface temperatures of the battery under test, optimizing fast charging of the battery under test, and shortening the charging time of the battery under test. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the application scenario of the battery charging control method provided in this application;

[0015] Figure 2 is a schematic diagram of the first process of the battery charging control method provided in this application;

[0016] Figure 3 is a schematic diagram of the second process of the battery charging control method provided in this application;

[0017] Figure 4 is a flowchart illustrating the steps for establishing the first mapping relationship provided in this application;

[0018] Figure 5 is a schematic diagram of the third process of the battery charging control method provided in this application;

[0019] Figure 6 is a schematic diagram of the first structure of the battery charging control system provided in this application;

[0020] Figure 7 is a schematic diagram of the second structure of the battery charging control system provided in this application. Embodiments of the present invention

[0021] The battery charging control method provided in this application can be applied to the application environment shown in Figure 1. The processing device may include a processor 102 and a memory 104. The memory 104 can be used to store data such as the current surface temperature, compensation temperature, target temperature, and target charging rate. The processor 102 can be used to acquire the current surface temperature of the battery under test; process the current surface temperature based on a preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature; obtain the target temperature of the battery under test based on the compensation temperature and the current surface temperature; process the target temperature based on a preset rate mapping model to obtain the target charging rate of the battery under test, so as to control the charging of the battery under test based on the target charging rate. The processing device may also include a display 106, which can display data such as the current surface temperature, compensation temperature, target temperature, and target charging rate through a graphical interface. For example, the processing device may be a battery management system (BMS), and the processing device may be installed in a vehicle.

[0022] In one embodiment, as shown in FIG2, a battery charging control method is provided. Taking the application of this method to the processor 102 in FIG1 as an example, the method includes the following steps:

[0023] Step S210: Obtain the current surface temperature of the battery under test.

[0024] The battery under test can be used in vehicles. It can have a regular shape, such as square or cylindrical, but it can also be an irregular shape. The battery can be a lithium-ion battery, for example, a lithium iron phosphate battery, a ternary lithium battery, or a lithium manganese iron battery. For example, the battery can include multiple individual cells, which can be connected in series or in parallel, or in combination of two of them; in another example, the battery can consist of a single individual cell.

[0025] The current surface temperature refers to the temperature detected on any surface of the battery under test. For example, a first external temperature probe can be placed on the cover plate of the battery under test, and the temperature of the battery under test can be detected by the first external temperature probe to obtain the current surface temperature of the corresponding battery under test. Alternatively, a second external temperature probe can be placed on the external terminal of the battery under test, and the temperature of the battery under test can be detected by the second external temperature probe to obtain the current surface temperature of the corresponding battery under test. In another example, at least two external temperature probes can be placed on one surface of the battery under test, and the temperature of the battery under test can be detected by multiple external temperature probes to obtain multiple surface temperatures of the corresponding external temperature probes. By averaging the multiple surface temperatures, the current surface temperature of the corresponding battery under test can be obtained.

[0026] Step S220: Process the current surface temperature based on the preset temperature mapping model to obtain the compensation temperature corresponding to the current surface temperature.

[0027] The preset temperature mapping model can be established using historical test data. For example, a test battery can be made with corresponding temperature probes installed inside and outside the battery. By charging the test battery and detecting its test temperature in real time using both the built-in and external temperature probes, the charging rate of the corresponding test battery can be adjusted in real time based on the test temperature detected by the built-in temperature probe. Thus, a preset temperature mapping model can be established based on multiple test temperatures.

[0028] Compensated temperature refers to the difference between the current surface temperature and the actual internal temperature of the battery under test. It should be noted that the actual internal temperature of the battery under test can be, but is not limited to, the temperature at the internal center point, the temperature at the chip pin location, or the temperature of the internal positive or negative terminal.

[0029] For example, based on the current surface temperature of the corresponding battery under test, a preset temperature mapping model is retrieved, and the current surface temperature is input into the preset temperature mapping model for processing, thereby obtaining the compensation temperature corresponding to the current surface temperature.

[0030] Step S230: Based on the compensation temperature and the current surface temperature, obtain the target temperature of the corresponding battery under test.

[0031] The target temperature refers to the actual internal temperature of the battery under test.

[0032] For example, the target temperature of the battery under test can be obtained by processing the difference between the current surface temperature and the compensation temperature.

[0033] Step S240: The target temperature is processed based on a preset rate mapping model to obtain the target charging rate of the battery under test, so as to control the charging of the battery under test based on the target charging rate.

[0034] The preset rate mapping model can be established using historical test data. For example, a test battery can be manufactured with a corresponding temperature probe inside. By charging the test battery and monitoring its temperature in real time using the built-in temperature probe, the charging rate of the corresponding test battery can be adjusted in real time based on the test temperature detected by the built-in temperature probe. Thus, a preset rate mapping model can be established based on the test temperatures detected by multiple built-in temperature probes and multiple charging rates.

[0035] The target charging rate refers to the charging rate corresponding to the target temperature. For example, multiple charging rate levels can be set, such as 0.1C to 6C, for instance, 1C, 2C, 3C, 4C, 5C, and 6C. Assuming the current charging rate of the battery under test is 6C, if the calculated target temperature falls within the first temperature range, the target charging rate is determined to be 5C, and the current charging rate of the battery under test is adjusted to 5C. If the calculated target temperature falls within the second temperature range, the target charging rate is determined to be 4C, and the current charging rate of the battery under test is adjusted to 4C, and so on. This allows the charging rate of the battery under test to adjust in real time according to the target temperature, avoiding direct adjustment of the charging rate based on the current surface temperature of the battery under test, improving the fast charging efficiency of the battery under test, and shortening the charging time.

[0036] In the embodiments provided in this application, the current surface temperature of the battery under test is obtained; the current surface temperature is processed based on a preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature; the target temperature of the battery under test is obtained based on the compensation temperature and the current surface temperature; the target temperature is processed based on a preset rate mapping model to obtain a target charging rate of the battery under test, and the charging of the battery under test is controlled based on the target charging rate to achieve fast charging of the battery under test and improve the fast charging efficiency of the battery under test. This application calculates the compensation temperature of the battery under test and obtains the target temperature of the battery under test through the compensation temperature, and then adjusts the charging rate of the battery under test according to the target temperature to obtain the target charging rate of the battery under test. Thus, the battery under test is charged based on the target charging rate, so that the charging rate of the battery under test jumps accordingly with the change of the target temperature, reducing the charging time extension caused by the falsely high surface temperature of the battery under test, optimizing the fast charging of the battery under test, and shortening the charging time of the battery under test.

[0037] In one embodiment, as shown in FIG3, a battery charging control method is provided. Taking the application of this method to the processor 102 in FIG1 as an example, the method includes the following steps:

[0038] Step S310: Obtain the current surface temperature of the battery under test.

[0039] The description of step S310 is provided in the embodiments and will not be repeated here.

[0040] Step S320: Obtain the current SOC of the battery under test.

[0041] SOC (State of Charge) indicates the remaining charge of the battery under test. For example, the current SOC can be calculated using an ampere-hour integration algorithm or an open-circuit voltage algorithm. For instance, the current of the battery under test can be measured in real time, and the measured current can be processed based on the ampere-hour integration algorithm to obtain the current SOC. Similarly, the open-circuit voltage of the battery under test can be measured, and the open-circuit voltage can be processed based on an open-circuit voltage algorithm to obtain the current SOC.

[0042] Step S330: Based on the current surface temperature and the current SOC, query the first mapping relationship to obtain the compensation temperature corresponding to the current surface temperature and the current SOC.

[0043] The preset temperature mapping model includes a first mapping relationship, which can be a tabular mapping relationship.

[0044] The first mapping relationship can be established using historical test data such as test surface temperature, preset SOC, and test compensation temperature. For example, a test battery can be fabricated with corresponding temperature probes installed both internally and externally. The internal temperature of the test battery is detected by the built-in probe, and the test surface temperature is detected by the external probe. The test battery is charged based on the corresponding preset SOC. Furthermore, the charging rate of the corresponding test battery is adjusted in real time based on the internal temperature detected by the built-in probe. The corresponding test compensation temperature is obtained based on the internal temperature and the corresponding test surface temperature. Thus, the first mapping relationship is established based on multiple preset SOCs, multiple test surface temperatures, and multiple test compensation temperatures. It should be noted that the battery under test and the test battery are from the same batch and model.

[0045] Based on the current surface temperature and current state of charge (SOC) of the battery under test, a first mapping relationship is queried to obtain the corresponding compensation temperature for the current surface temperature and current SOC. For example, based on the model information of the battery under test, the first mapping relationship for the corresponding battery is retrieved, and the corresponding compensation temperature of the battery under test can be obtained by querying the first mapping relationship.

[0046] Step S340: Based on the compensation temperature and the current surface temperature, obtain the target temperature of the corresponding battery under test.

[0047] The description of step S340 is provided in the embodiments and will not be repeated here.

[0048] Step S350: The target temperature is processed based on a preset rate mapping model to obtain the target charging rate of the battery under test, so as to control the charging of the battery under test based on the target charging rate.

[0049] The explanation of step S350 is given in the description of the embodiments and will not be repeated here.

[0050] In the embodiments provided in this application, the corresponding compensation temperature of the battery under test is obtained based on the first mapping relationship, and the target temperature of the battery under test is obtained through the compensation temperature. Then, the charging rate of the battery under test is adjusted according to the target temperature to obtain the target charging rate of the battery under test. Thus, the battery under test is charged based on the target charging rate, so that the charging rate of the battery under test jumps accordingly with the change of the target temperature. This reduces the charging time extension caused by the falsely high surface temperature of the battery under test, optimizes the fast charging of the battery under test, shortens the charging time of the battery under test, and improves the fast charging efficiency of the battery under test.

[0051] In one embodiment, the preset rate mapping model includes a second mapping relationship; the step of processing the target temperature based on the preset rate mapping model to obtain the target charging rate of the corresponding battery under test includes:

[0052] Based on the target temperature and the current SOC, the second mapping relationship is queried to obtain the target charging rate of the corresponding battery under test.

[0053] The preset multiplier mapping model includes a second mapping relationship, which can be a tabular mapping relationship.

[0054] The second mapping relationship can be established using historical test data such as internal temperature, state of charge (SOC), and charging rate. For example, a test battery can be fabricated with an internal temperature probe. The internal temperature of the test battery is detected by the built-in probe, and the battery is charged based on the corresponding SOC. Furthermore, the charging rate is adjusted in real-time based on the internal temperature detected by the built-in probe. Thus, the second mapping relationship is established based on multiple SOCs, multiple internal temperatures, and multiple charging rates. It should be noted that the battery under test and the test battery are from the same batch and model.

[0055] For example, the internal test temperature T is 25℃≤T≤45℃, 45℃<T<50℃, and 50℃≤T<55℃; the test SOC is 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 99%, and 100%. When the internal test temperature is 25℃≤T≤45℃ and the test SOC is 5%, the corresponding test charging rate is 1. The second mapping relationship is shown in the table below:

[0056] 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 25℃ to 45℃ 1 1 2.2 2.2 2.2 2.2 2 2 2 1.8 45℃ to 50℃ 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 50℃ to 55℃ 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33 60% 65% 7 0% 75% 80% 85% 90% 95% 97% 99% 100% 25℃ to 45℃ 1.8 1.5 1.5 11 0.8 0.8 0.5 0.33 0.2 0.2 45℃ to 50℃ 0.8 0.8 0.8 0.8 0.8 0.8 0.5 0.33 0.33 0.33 50℃ to 55℃ 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33 0.33

[0057] Based on the obtained target temperature and current SOC of the battery under test, a second mapping relationship is queried to obtain the target charging rate for the corresponding target temperature and current SOC. For example, based on the model information of the battery under test, the corresponding second mapping relationship is retrieved. The target charging rate for the corresponding target temperature and current SOC can then be obtained by querying the second mapping relationship. The battery under test is then charged based on the target charging rate, allowing the charging rate to adjust accordingly to changes in the target temperature. This optimizes fast charging of the battery under test, shortens charging time, and improves fast charging efficiency.

[0058] In one embodiment, the target temperature includes a maximum target temperature and a minimum target temperature; the current SOC includes a maximum current SOC and a minimum current SOC; the step of processing the target temperature based on a preset rate mapping model to obtain the target charging rate of the corresponding battery under test includes:

[0059] Based on the maximum target temperature, minimum target temperature, maximum current SOC, and minimum current SOC, the second mapping relationship is queried to obtain the target charging rate of the corresponding battery under test.

[0060] For example, multiple external temperature probes can be spaced apart on the surface of the battery under test. At corresponding acquisition times, these probes acquire the current surface temperature of the battery under test. Using the steps in the embodiments provided in this application to calculate the compensation temperature and target temperature of the battery under test, the corresponding target temperature is calculated. By comparing the values ​​of the multiple target temperatures, the maximum and minimum target temperatures are obtained. Furthermore, between the acquisition of the current surface temperature of the battery under test and the acquisition of the corresponding target temperature, the State of Charge (SOC) of the battery under test can be estimated based on a preset frequency, resulting in multiple current SOCs. By comparing the values ​​of these multiple current SOCs, the maximum and minimum current SOCs are obtained.

[0061] The target temperature range is determined by the maximum and minimum target temperatures, and the current SOC range is determined by the maximum and minimum current SOC. Then, a second mapping relationship is queried based on the target temperature range and the current SOC range to determine the target charging rate of the battery under test at the next moment. The battery is then charged based on this target charging rate, allowing the charging rate to adjust accordingly to changes in the target temperature. This optimizes fast charging, shortens charging time, and improves fast charging efficiency.

[0062] In one embodiment, as shown in Figure 4, the steps for establishing the first mapping relationship include:

[0063] Step S410: Based on the preset SOC, a charging test is performed on the test battery; a first temperature detector is installed inside the test battery, and a second temperature detector is installed outside the test battery; the first temperature detector is configured to detect the internal temperature of the test battery to obtain the internal temperature; the second temperature detector is configured to detect the external temperature of the test battery to obtain the external surface temperature.

[0064] The first temperature detector can be an NTC temperature detector. For example, the first temperature detector can be located at the center of the cell pack of the test battery. It should be noted that the first temperature detector can also be located at the top or bottom of the cell pack, on the pins, or at internal terminals within the test battery. The first temperature detector can detect the internal temperature of the battery under test based on a first preset sampling frequency, thereby obtaining the internal temperature of the test battery. The second temperature detector can also be an NTC temperature detector. For example, the second temperature detector can be located on one side of the test battery, such as at an external terminal or cover plate. The second temperature detector can detect the external temperature of the battery under test based on a second preset sampling frequency, thereby obtaining the external temperature of the test battery. It should be noted that the first preset sampling frequency can be set to be equal to the second preset sampling frequency.

[0065] The preset SOC can be set to multiple SOC ranges, such as 0 to 100%, 10% to 90%, 20% to 80%, and 30% to 80%. Based on the preset SOC, the test battery is charged. During the charging test, the internal temperature of the test battery is detected by a first temperature detector, and the external temperature of the test battery is detected by a second temperature detector.

[0066] Step S420: Obtain the internal temperature and surface temperature of the test battery at multiple corresponding acquisition times.

[0067] For example, the first temperature detector collects the internal temperature of the test battery based on a preset collection time, obtains the internal temperature of the test battery, and transmits the internal temperature of the test battery to the processor; the second temperature detector collects the external temperature of the test battery based on the corresponding collection time, obtains the external temperature of the test battery, and transmits the external temperature of the test battery to the processor, thereby the processor obtains the internal temperature and the external temperature of the test battery at the corresponding collection time.

[0068] Step S430: Based on multiple internal test temperatures and multiple test surface temperatures, obtain multiple test compensation temperatures at corresponding acquisition times.

[0069] The test compensation temperature of the test battery at the corresponding acquisition time is obtained by processing the difference between the test surface temperature and the test internal temperature at the corresponding acquisition time. For example, if the test compensation temperature is set as ΔT, the test internal temperature is Tmid, and the test surface temperature is T, then the test compensation temperature ΔT = T - Tmid.

[0070] Step S440: Based on the test surface temperature, preset SOC and test compensation temperature at multiple corresponding acquisition times, a first mapping relationship is established.

[0071] For example, a first mapping relationship is established based on the preset SOC, test surface temperature, and test compensation temperature at multiple corresponding acquisition times. Then, the first mapping relationship corresponding to the battery under test can be retrieved according to the model information of the battery under test. The corresponding compensation temperature of the battery under test can be obtained by querying the first mapping relationship, and the target temperature of the battery under test can be obtained through the compensation temperature. Then, the charging rate of the battery under test is adjusted according to the target temperature to obtain the target charging rate of the battery under test. Thus, the battery under test is charged based on the target charging rate, so that the charging rate of the battery under test jumps accordingly with the change of the target temperature, shortening the charging time of the battery under test and improving the fast charging efficiency of the battery under test.

[0072] In one embodiment, the first temperature detector includes at least two temperature probes, and the test battery has at least two temperature acquisition points inside, with each temperature probe corresponding to each temperature acquisition point; the temperature probes are configured to detect the temperature of the corresponding temperature acquisition point to obtain the temperature of the acquisition point.

[0073] The temperature probe can be an NTC probe. For example, the first temperature detector includes two temperature probes. The test battery has temperature acquisition points at the center of the core pack and at the pin position. One temperature probe is set at the center of the core pack of the test battery, so that the temperature of the acquisition point at the corresponding core pack center position can be acquired. The other temperature probe is set at the pin position of the test battery, so that the temperature of the acquisition point at the corresponding pin position can be acquired.

[0074] In one embodiment, the step of obtaining the test internal temperature of the test battery at multiple corresponding acquisition times includes: obtaining the temperature of multiple acquisition points of the test battery at the corresponding acquisition times; averaging the multiple acquisition point temperatures at the corresponding acquisition times to obtain the test internal temperature at the corresponding acquisition times.

[0075] Multiple temperature probes collect the internal temperature of the test battery at preset acquisition times, obtaining multiple corresponding acquisition point temperatures. These temperatures are then transmitted to the processor, which in turn obtains the multiple acquisition point temperatures of the test battery at the corresponding acquisition times. The processor averages these multiple acquisition point temperatures to obtain the internal temperature of the test battery at the corresponding acquisition times, thereby improving the accuracy of calculating the internal temperature of the test battery.

[0076] In one example, as shown in Figure 5, the battery charging control process is as follows: A test cell with a built-in temperature probe is fabricated. This test cell, along with normal cells, forms a test battery system. Temperature data from the test battery system is collected. Based on the collected temperature data, a compensation temperature is calculated. Then, based on the compensation temperature and a preset rate mapping model, fast charging control is implemented for the battery under test. This involves obtaining the current surface temperature of the battery under test; processing the current surface temperature based on the preset temperature mapping model to obtain the corresponding compensation temperature; obtaining the target temperature of the battery under test based on the compensation temperature and the current surface temperature; processing the target temperature based on the preset rate mapping model to obtain the target charging rate of the battery under test; and controlling the charging of the battery under test based on the target charging rate to achieve fast charging, thereby improving the fast charging efficiency and shortening the charging time.

[0077] It should be understood that although the steps in the flowcharts of Figures 2 to 5 are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in Figures 2 to 5 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0078] In one embodiment, this application provides a battery charging control device, comprising:

[0079] The surface temperature acquisition unit is configured to acquire the current surface temperature of the battery under test.

[0080] The compensation temperature acquisition unit is configured to process the current surface temperature based on a preset temperature mapping model to obtain the compensation temperature corresponding to the current surface temperature.

[0081] The target temperature acquisition unit is configured to obtain the target temperature of the corresponding battery under test based on the compensation temperature and the current surface temperature.

[0082] The rate adjustment unit is configured to process the target temperature based on a preset rate mapping model to obtain the target charging rate of the battery under test, and to control the charging of the battery under test based on the target charging rate.

[0083] For limitations on the battery charging control device, please refer to the limitations on the battery charging control method above, which will not be repeated here. Each module in the battery charging control device provided in this application can be implemented entirely or partially through software, hardware, or a combination thereof. Each module provided in this application can be embedded in hardware or independently of the processor in the battery charging control system, or it can be stored in software in the memory of the battery charging control system, so that the processor can call and execute the operations corresponding to the above multiple modules.

[0084] In one embodiment, as shown in FIG6, a battery charging control system is also provided, including a processing device 610 connected to a battery under test 620; the processing device is configured to perform the steps of the battery charging control method provided in any one of the present application.

[0085] The processing device 610 may include a BMS (Battery Management System). An external temperature probe may be installed on the surface of the battery under test. For example, a first external temperature probe may be installed on the cover plate of the battery under test to detect the temperature of the battery and thus obtain the current surface temperature of the corresponding battery. Alternatively, a second external temperature probe may be installed on the external terminals of the battery under test to detect the temperature of the battery and thus obtain the current surface temperature of the corresponding battery.

[0086] The processing device acquires the current surface temperature of the battery under test; processes the current surface temperature based on a preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature; obtains the target temperature of the battery under test based on the compensation temperature and the current surface temperature; processes the target temperature based on a preset rate mapping model to obtain the target charging rate of the battery under test, and controls the charging of the battery under test based on the target charging rate to achieve fast charging of the battery under test and improve the fast charging efficiency of the battery under test.

[0087] In the embodiments provided in this application, the processing device calculates the compensation temperature of the battery under test and obtains the target temperature of the battery under test through the compensation temperature. Then, it adjusts the charging rate of the battery under test according to the target temperature to obtain the target charging rate of the battery under test. Thus, the battery under test is charged based on the target charging rate, so that the charging rate of the battery under test jumps accordingly with the change of the target temperature. This reduces the charging time extension caused by the falsely high surface temperature of the battery under test, optimizes the fast charging of the battery under test, and shortens the charging time of the battery under test.

[0088] In one embodiment, as shown in FIG7, the battery charging control system further includes a test battery 630, which is connected to the processing device 610.

[0089] The test battery 630 can be the same model as the battery under test. The test battery 630 is equipped with internal and external temperature probes. By conducting charging tests on the test battery 630 and monitoring its temperature in real time using both the internal and external temperature probes, the charging rate of the test battery 630 is adjusted in real time based on the temperature detected by the internal temperature probe. This allows for the establishment of a preset temperature mapping model based on multiple test temperatures and multiple charging rates. Alternatively, the test battery 630 can also be charged and its temperature monitored in real time using the internal temperature probe. The charging rate of the test battery 630 is adjusted in real time based on the temperature detected by the internal temperature probe, allowing for the establishment of a preset rate mapping model based on the test temperatures detected by multiple internal temperature probes and multiple charging rates.

[0090] In one embodiment, as shown in FIG7, the battery charging control system further includes a first temperature detector 640 and a second temperature detector 650; the first temperature detector 640 and the second temperature detector 650 are respectively connected to the processing device 610; the first temperature detector 640 is disposed inside the test battery 630, and the second temperature detector 650 is disposed outside the test battery 630.

[0091] The first temperature detector 640 can be an NTC temperature detector. For example, the first temperature detector 640 can be located at the center of the cell pack of the test battery 630. It should be noted that the first temperature detector 640 can also be located at the top or bottom of the cell pack, on the pins, or at internal terminals within the test battery 630. The first temperature detector 640 can detect the internal temperature of the battery under test based on a first preset sampling frequency, thereby obtaining the internal temperature of the test battery. The second temperature detector 650 can also be an NTC temperature detector. For example, the second temperature detector 650 can be located on one side of the test battery 630, such as at an external terminal or cover plate. The second temperature detector 650 can detect the external temperature of the battery under test based on a second preset sampling frequency, thereby obtaining the external temperature of the test battery. It should be noted that the first preset sampling frequency can be set to be equal to the second preset sampling frequency.

[0092] For example, the first temperature detector 640 includes two temperature probes. The test battery 630 has temperature acquisition points at the core center and pin positions. One temperature probe is set at the core center of the test battery 630, so that the temperature at the acquisition point at the core center can be acquired. The other temperature probe is set at the pin position of the test battery 630, so that the temperature at the acquisition point at the pin position can be acquired.

[0093] Multiple temperature probes collect the internal temperature of the test battery 630 at preset acquisition times, obtaining multiple corresponding acquisition point temperatures. These temperatures are then transmitted to the processing device 610, which in turn obtains the multiple acquisition point temperatures of the test battery 630 at the corresponding acquisition times.

[0094] The temperature at the sampling points is averaged to obtain the internal temperature of the experiment at the corresponding sampling time, which can improve the accuracy of calculating the internal temperature of the experiment, thereby improving the accuracy of establishing the first mapping relationship.

[0095] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of any of the battery charging control methods provided in this application.

[0096] For example, when a computer program is executed by a processor, it implements the following steps of a battery charging control method:

[0097] By acquiring the current surface temperature of the battery under test, processing the current surface temperature based on a preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature, obtaining the target temperature of the battery under test based on the compensation temperature and the current surface temperature, and processing the target temperature based on a preset rate mapping model to obtain the target charging rate of the battery under test, the charging of the battery under test is controlled based on the target charging rate, thereby achieving fast charging of the battery under test and improving the fast charging efficiency of the battery under test.

[0098] Those skilled in the art will understand that implementing all or part of the processes in the embodiments provided in this application can be accomplished by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the division operation method provided in this application. Any references to memory, storage, databases, or other media used in the various embodiments provided in this application can include any one or a combination of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

Claims

1. A battery charging control method, comprising the steps of: obtaining a current surface temperature of a battery to be tested; processing the current surface temperature based on a preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature; obtaining a target temperature corresponding to the battery to be tested according to the compensation temperature and the current surface temperature; processing the target temperature based on a preset rate mapping model to obtain a target charging rate corresponding to the battery to be tested, so as to control the charging of the battery to be tested based on the target charging rate.

2. The battery charging control method according to claim 1, wherein The preset temperature mapping model comprises a first mapping relationship; The step of processing the current surface temperature based on the preset temperature mapping model to obtain a compensation temperature corresponding to the current surface temperature comprises: obtaining a current SOC of the battery to be tested; According to the current surface temperature and the current SOC, the first mapping relationship is queried to obtain the compensation temperature corresponding to the current surface temperature and the current SOC.

3. The battery charging control method according to claim 2, wherein The preset rate mapping model comprises a second mapping relationship; the step of processing the target temperature based on the preset rate mapping model to obtain a target charging rate corresponding to the battery to be tested comprises: According to the target temperature and the current SOC, the second mapping relationship is queried to obtain the target charging rate corresponding to the battery to be tested.

4. The battery charging control method according to claim 3, wherein The target temperature comprises a maximum target temperature and a minimum target temperature; the current SOC comprises a maximum current SOC and a minimum current SOC; The step of processing the target temperature based on the preset rate mapping model to obtain a target charging rate corresponding to the battery to be tested comprises: According to the maximum target temperature, the minimum target temperature, the maximum current SOC and the minimum current SOC, the second mapping relationship is queried to obtain the target charging rate corresponding to the battery to be tested.

5. The battery charging control method according to claim 2, wherein The establishment step of the first mapping relationship comprises: Based on a preset SOC, a test battery is charged and tested; the test battery is internally provided with a first temperature detector, and the test battery is externally provided with a second temperature detector; the first temperature detector is configured to detect the temperature inside the battery to be tested to obtain a test internal temperature; the second temperature detector is configured to detect the temperature outside the battery to be tested to obtain a test surface temperature; obtaining the test internal temperature and the test surface temperature of the test battery at a plurality of corresponding collection time points; According to a plurality of the test internal temperature and a plurality of the test surface temperature, a plurality of test compensation temperatures at a plurality of corresponding collection time points are obtained; According to the test surface temperature at a plurality of corresponding collection time points, the preset SOC and the test compensation temperature, the first mapping relationship is established.

6. The battery charging control method according to claim 5, wherein The first temperature detector comprises at least two temperature probes, and the test battery is internally provided with at least two temperature collection points; each temperature probe is one-to-one correspondingly arranged with each temperature collection point; the temperature probe is configured to detect the temperature of the corresponding temperature collection point to obtain a collection point temperature; The step of obtaining the test internal temperature of the test battery at a plurality of corresponding collection time points comprises: acquiring a plurality of acquisition point temperatures of the test battery at a corresponding acquisition time; averaging the plurality of acquisition point temperatures at the corresponding acquisition time to obtain the test internal temperature at the corresponding acquisition time. 7.A battery charging control system, comprising a processing device connected to a battery to be tested; the processing device is configured to perform the steps of the battery charging control method according to any one of claims 1 to 6. 8.The battery charging control system according to claim 7, further comprising a test battery connected to the processing device. 9.The battery charging control system according to claim 8, further comprising a first temperature detector and a second temperature detector, wherein the first temperature detector and the second temperature detector are respectively connected to the processing device; the first temperature detector is arranged inside the test battery, and the second temperature detector is arranged outside the test battery. 10.A computer readable storage medium, having stored thereon a computer program, wherein the computer program is executed by a processor to implement the steps of the battery charging control method according to any one of claims 1 to 6.

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