Battery charging method and device, computer equipment, storage medium and program product

Abstract

The invention relates to a battery charging method and device, computer equipment, a storage medium and a program product. The method comprises the following steps: determining a second internal resistance of a battery in a next charging time period of a current charging time period according to the charging time period of the battery by adopting a first charging current in the current charging time period and a first internal resistance of the battery in the current charging time period under the condition that the shelving time period of the battery is greater than a preset time period, and according to the first internal resistance, the second internal resistance and a heat control condition of the battery, determining a second charging current of the next charging period, and when the battery enters the next charging period, charging the battery according to the second charging current. The second charging current is determined based on the heat control condition, so that the heat production of the battery adopting the second charging current in the next charging period is not lower than the heat production in the current charging period, the temperature rise rate of the battery can be considered, and the charging efficiency and the service life of the battery are both considered.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery charging method, device, computer equipment, storage medium and program product. Background Art

[0002] With the rapid development of new energy technologies, the number of electric vehicles and electric ships using batteries is gradually increasing, and users have higher requirements for battery life and charging efficiency. The battery life and charging efficiency are affected by the battery charging method. Therefore, how to charge the battery to take into account both the battery life and charging efficiency has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0003] Based on this, it is necessary to provide a battery charging method, device, computer equipment, storage medium and program product that can take into account both the battery life and charging efficiency in order to solve the above technical problems.

[0004] In a first aspect, the present application provides a battery charging method. The method comprises:

[0005] When the shelf time of the battery is greater than the preset time, according to the charging time of the battery using the first charging current in the current charging period and the first internal resistance of the battery in the current charging period, determine the second internal resistance of the battery in the next charging period of the current charging period;

[0006] Determine a second charging current for the next charging period according to the first internal resistance, the second internal resistance and a heat control condition of the battery; the heat control condition includes that a first heat generation of the battery when the first charging current is used within the same time period is less than or equal to a second heat generation of the battery when the second charging current is used;

[0007] When the battery enters the next charging period, the battery is charged according to the second charging current.

[0008] The method provided in this embodiment determines the second internal resistance of the battery in the next charging period of the current charging period according to the charging time of the battery using the first charging current in the current charging period and the first internal resistance of the battery in the current charging period when the battery is idle for longer than the preset time, determines the second charging current of the next charging period according to the first internal resistance, the second internal resistance and the thermal control condition of the battery, and charges the battery according to the second charging current when the battery enters the next charging period. Since the second charging current determined based on the thermal control condition can make the heat generation of the battery using the second charging current in the next charging period not lower than the heat generation in the current charging period, it can achieve the temperature rise rate of the battery, thereby achieving the charging efficiency and the service life of the battery.

[0009] In one embodiment, determining a second charging current according to a first internal resistance, a second internal resistance, and a heat control condition of the battery includes:

[0010] Determining a rate of change of internal resistance according to the first internal resistance and the second internal resistance;

[0011] Determining a heat generation ratio according to the rate of change of internal resistance and a preset rate of change of current; the heat generation ratio is used to characterize the ratio of the heat generation of the battery obtained based on the preset rate of change of current to the first heat generation;

[0012] Determining a target rate of change of current based on the heat generation ratio and the heat control condition;

[0013] Determining the second charging current according to the target rate of change of current and the first charging current.

[0014] In the method provided in this embodiment, by determining the rate of change of internal resistance according to the first internal resistance and the second internal resistance, determining the heat generation ratio according to the rate of change of internal resistance and the preset rate of change of current, determining the target rate of change of current based on the heat generation ratio and the heat control condition, and determining the second charging current according to the target rate of change of current and the first charging current, by determining the heat generation ratio based on the rate of change of internal resistance, without calculating the specific values of the heat generation of the battery obtained based on the preset rate of change of current and the first heat generation, the heat generation ratio can be obtained, thereby improving the efficiency of obtaining the heat generation ratio, and further improving the efficiency of obtaining the second charging current.

[0015] In one embodiment, determining a target rate of change of current based on the heat generation ratio and the heat control condition includes:

[0016] If the heat generation ratio meets the heat control condition, using the preset rate of change of current as the target rate of change of current;

[0017] If the heat generation ratio does not meet the heat control condition, adjusting the preset rate of change of current to obtain the target rate of change of current; the target rate of change of current is the rate of change of current for which the heat generation ratio obtained based on the target rate of change of current meets the heat control condition.

[0018] In the method provided in this embodiment, if the heat generation ratio meets the heat control condition, the preset rate of change of current can be directly used as the target rate of change of current. If the heat generation ratio does not meet the heat control condition, adjusting the preset rate of change of current to obtain the target rate of change of current that meets the heat control condition lays a foundation for determining the second charging current based on the target rate of change of current.

[0019] In one embodiment, adjusting the preset rate of change of current to obtain the target rate of change of current includes:

[0020] Adjusting the preset rate of change of current according to a preset adjustment amplitude;

[0021] Determine the new heat generation ratio based on the internal resistance change rate and the new current change rate obtained after the current adjustment

[0022] If the new heat generation ratio does not meet the heat control condition, return to execute the step of adjusting the new current change rate according to the preset adjustment amplitude until the new heat generation ratio obtained after the most recent adjustment meets the heat control condition, and use the new current change rate obtained after the most recent adjustment as the target current change rate.

[0023] The method provided in this embodiment adjusts the preset current change rate according to the preset adjustment amplitude, determines the new heat generation ratio based on the internal resistance change rate and the new current change rate obtained after the current adjustment. If the new heat generation ratio does not meet the heat control condition, return to execute the step of adjusting the new current change rate according to the preset adjustment amplitude until the new heat generation ratio obtained after the most recent adjustment meets the heat control condition, and use the new current change rate obtained after the most recent adjustment as the target current change rate, thereby realizing the determination of the target current change rate and laying a foundation for determining the second charging current based on the target current change rate.

[0024] In one embodiment, the method further includes:

[0025] If the new heat generation ratio meets the heat control condition, use the new current change rate obtained after the current adjustment as the target current change rate.

[0026] The method provided in this embodiment realizes the determination of the target current change rate by using the new current change rate obtained after the current adjustment as the target current change rate if the new heat generation ratio meets the heat control condition, and lays a foundation for determining the second charging current based on the target current change rate.

[0027] In one embodiment, the method further includes:

[0028] If the heat generation ratio is greater than or equal to the preset ratio, determine that the heat generation ratio meets the heat control condition.

[0029] The method provided in this embodiment can make the target current change rate determined based on the heat generation ratio and the heat control condition meet the heat control condition, and further make the determined second charging current meet the heat control condition, that is, the heat generation during the second charging stage of charging the battery with the second charging current is not lower than the heat generation during the first charging stage, by determining that the heat generation ratio meets the heat control condition if the heat generation ratio is greater than or equal to the preset ratio.

[0030] In one embodiment, determining the heat generation ratio based on the internal resistance change rate and the preset current change rate includes:

[0031] Determine the first summation result of the preset value and the preset current change rate, and determine the second summation result of the preset value and the internal resistance change rate;

[0032] Determine the heat generation ratio according to the product of the square of the first summation result and the second summation result.

[0033] The method provided in this embodiment determines the heat generation ratio by determining the first summation result of the preset value and the preset current change rate, and determining the second summation result of the preset value and the internal resistance change rate, and according to the product of the square of the first summation result and the second summation result. Since the heat generation ratio can be determined without specifically calculating the values of the intermediate heat generation and the first heat generation, the determination efficiency of the heat generation ratio is improved.

[0034] In one of the embodiments, determining the heat generation ratio according to the product of the square of the first summation result and the second summation result includes:

[0035] Take the product of the square of the first summation result and the second summation result as the heat generation ratio.

[0036] The method provided in this embodiment determines the heat generation ratio by determining the first summation result of the preset value and the preset current change rate, and determining the second summation result of the preset value and the internal resistance change rate, and according to the product of the square of the first summation result and the second summation result. Since the heat generation ratio can be determined without specifically calculating the values of the intermediate heat generation and the first heat generation, the determination efficiency of the heat generation ratio is improved.

[0037] In one of the embodiments, determining the second internal resistance of the battery in the next charging period according to the charging duration of the battery with the first charging current in the current charging period and the first internal resistance of the battery in the current charging period includes:

[0038] When the charging duration is less than the charging duration threshold and the difference between the charging duration and the charging duration threshold is equal to the preset difference, obtain the first voltage of the battery;

[0039] When the charging duration is equal to the charging duration threshold, obtain the second voltage of the battery;

[0040] Determine the second internal resistance of the battery according to the voltage difference between the second voltage and the first voltage and the first charging current.

[0041] The method provided in this embodiment obtains the first voltage of the battery when the charging duration is less than the charging duration threshold and the difference between the charging duration and the charging duration threshold is equal to the preset difference, and obtains the second voltage of the battery when the charging duration is equal to the charging duration threshold. According to the voltage difference between the second voltage and the first voltage and the first charging current, the second internal resistance of the battery is determined. Since the second voltage is obtained when the charging duration is equal to the charging duration threshold, and then the second internal resistance is obtained, it is convenient to quickly determine the second charging current based on the second internal resistance after entering the next charging period, so as to quickly charge the battery according to the second charging current in the next charging period and improve the charging efficiency.

[0042] In one embodiment, charging the battery according to the second charging current includes:

[0043] When the state of charge of the battery is less than the preset state of charge and the battery temperature of the battery is less than the preset temperature, the battery is charged according to the second charging current.

[0044] The method provided in this embodiment can improve the service life of charging the battery when the battery temperature is relatively low by charging the battery according to the second charging current when the state of charge of the battery is less than the preset state of charge and the battery temperature of the battery is less than the preset temperature.

[0045] In one embodiment, when the current charging period is the first charging period, when the battery's shelf duration is greater than the preset duration, according to the charging duration of charging the battery with the first charging current in the current charging period and the first internal resistance of the battery in the current charging period, determining the second internal resistance of the battery in the next charging period of the current charging period includes:

[0046] When the battery's shelf duration is greater than the preset duration, if the battery temperature is less than the preset temperature, then according to the charging duration of charging the battery with the initial charging current in the first charging period and the initial internal resistance of the battery in the first charging period, determine the second internal resistance of the battery in the next charging period of the first charging period;

[0047] Wherein, the initial charging current is determined according to the charging performance test data of the sample battery, the initial battery temperature and the initial state of charge when the battery enters the first charging period, and the charging performance test data is used to characterize the corresponding relationship between the battery temperature, the state of charge and the charging current; the initial internal resistance is determined according to the internal resistance test data of the sample battery, the initial battery temperature and the initial state of charge.

[0048] For the method provided in this embodiment, when the current charging period is the first charging period, if the battery temperature of the battery is less than the preset temperature, then according to the charging duration of the battery with the initial charging current in the first charging period and the initial internal resistance of the battery in the first charging period, the second internal resistance of the battery in the next charging period of the first charging period is determined. Thus, it is possible to determine the second internal resistance of the battery in the next charging period of the first charging period, providing a relatively reliable basis for determining the second charging current in the next charging period and facilitating a more accurate determination of the second charging current.

[0049] In a second aspect, the present application also provides a battery charging device. The device includes:

[0050] A first determination module, configured to determine the second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery with the first charging current in the current charging period and the first internal resistance of the battery in the current charging period when the storage duration of the battery is greater than the preset duration;

[0051] A second determination module, configured to determine the second charging current in the next charging period according to the first internal resistance, the second internal resistance, and the heat control condition of the battery; the heat control condition includes that the first heat generation of the battery when using the first charging current within the same duration is less than or equal to the second heat generation of the battery when using the second charging current;

[0052] A charging module, configured to charge the battery with the second charging current when the battery enters the next charging period.

[0053] In a third aspect, the present application also provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of any of the above methods are implemented.

[0054] In a fourth aspect, the present application also provides a computer-readable storage medium. On the computer-readable storage medium, a computer program is stored, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0055] In a fifth aspect, the present application also provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0056] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings

[0057] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0058] Figure 1 is a schematic diagram showing the relationship between the charging current and the SOC of a battery before and after storage provided by an embodiment of the present application;

[0059] Figure 2 is a schematic diagram showing the relationship between the charging current and the SOC of another battery before and after storage provided by an embodiment of the present application;

[0060] Figure 3 is a schematic flowchart of a battery charging method provided by an embodiment of the present application;

[0061] Figure 4 is a schematic flowchart of a method for determining a second charging current provided by an embodiment of the present application;

[0062] Figure 5 is a schematic flowchart of a method for obtaining a target current change rate provided by an embodiment of the present application;

[0063] Figure 6 is a schematic flowchart of a method for determining a heat generation ratio provided by an embodiment of the present application;

[0064] Figure 7 is a schematic flowchart of a method for determining a second internal resistance provided by an embodiment of the present application;

[0065] Figure 8 is a schematic overall flowchart of a battery charging method provided by an embodiment of the present application;

[0066] Figure 9 is a schematic simulation diagram of the relationship between the battery temperature and the SOC during the battery charging process provided by an embodiment of the present application;

[0067] Figure 10 is a comparison schematic diagram of the current change rate in a traditional charging method and the current change rate provided by an embodiment of the present application;

[0068] Figure 11 is a schematic structural diagram of a battery charging device provided by an embodiment of the present application;

[0069] Figure 12 is an internal structure diagram of a computer device in an embodiment. Detailed Embodiments

[0070] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0073] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0075] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0076] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0077] With the rapid development of new energy technologies, the number of electric vehicles and electric ships using batteries is gradually increasing, and users have higher requirements for the service life and charging efficiency of batteries. The service life and charging efficiency of batteries are affected by the battery charging method.

[0078] The current battery charging method is as follows: Obtain the initial battery temperature and the initial state of charge (SOC) before battery charging. Based on the pre-acquired charging performance test data, the initial battery temperature, and the initial SOC, determine the initial charging current at the initial battery temperature and the initial SOC, and start charging the battery with the initial charging current. As the charging time progresses, the battery temperature rises and the SOC of the battery also increases. It is possible to obtain the battery temperature and the SOC during the battery charging process. Based on the charging performance test data, the battery temperature, and the SOC during the battery charging process, obtain the charging current at the battery temperature and the SOC, and charge the battery based on the charging current. That is, the charging current during the entire charging process is determined based on the charging performance test data, the battery temperature, and the SOC. Among them, the charging performance test data includes the corresponding relationship between the battery temperature, the state of charge, and the charging current.

[0079] However, during the battery storage process, due to side reactions, the impedance of the negative electrode increases, resulting in a decrease in the battery charging current. As Figure 1 shown, Figure 1 is a schematic diagram of the relationship between the charging current and the SOC before and after battery storage provided by the embodiments of the present application. For example, Figure 1 the curve in is the relationship between the charging current and the SOC of the battery at -20°C. Curve 11 is the curve before the battery is stored, and curve 14 is the curve after the battery is stored for 40 days; curve 12 is the curve before another battery is stored, and curve 13 is the curve after the battery is stored for 40 days. Based on Figure 1 the curves shown, it can be seen that the charging current corresponding to the SOC in the range of 20% to 40% is reduced by about 15% compared to before storage; as Figure 2 shown, Figure 2It is a schematic diagram showing the relationship between the charging current and the SOC of another battery before and after storage provided by the embodiments of the present application. Figure 2 It is the relationship between the charging current and the SOC of the battery at 25°C. Curve 15 is the curve of the battery before storage, and curve 16 is the curve of the battery after 40 days of storage. The other curves in this figure are the curves of other battery tests. Based on curve 15 and curve 16, it can be seen that when the SOC is in the range of 20% - 80%, the corresponding charging current decreases by about 6% compared with that before storage.

[0080] Based on the above Figure 1 and Figure 2 It can be seen that the charging current of the battery is affected by the storage duration. If the battery is charged after a long storage duration, at the same SOC, the charging current of the battery is less than that before storage, that is, the charging current that the battery can accept after a long storage time will be lower than that before storage. Currently, the battery charging method does not consider the storage duration of the battery. For a battery with a long storage time, it still charges based on the charging current obtained from the charging performance test table, that is, it still uses a relatively large charging current for charging. Although it can take into account the charging efficiency, if the ability of the battery to accept the charging current decreases and it still uses the charging current before the ability decreases to charge the battery, it will cause lithium plating of the battery and affect the service life of the battery.

[0081] Therefore, how to charge the battery to balance the service life and charging efficiency of the battery has become an urgent technical problem in this field.

[0082] To solve the above technical problem, the embodiments of the present application provide a battery charging method, as Figure 3 shown, Figure 3 It is a schematic flowchart of a battery charging method provided by the embodiments of the present application. This method can be applied to a battery management system. The method includes the following steps:

[0083] S201, when the storage duration of the battery is greater than the preset duration, determine the second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery with the first charging current in the current charging period and the first internal resistance of the battery in the current charging period.

[0084] Among them, the storage duration refers to the duration that the battery is placed in a certain position without being used. The battery can be a battery installed in a vehicle or a ship, or a battery stored separately in a certain position.

[0085] When starting to charge the battery, the initial charging current of the battery can be determined based on the charging performance test data of the sample battery, the initial battery temperature and the initial state of charge when the battery is charged, and the initial internal resistance of the battery can be determined based on the internal resistance test data of the sample battery, the initial battery temperature and the initial state of charge of the battery.

[0086] It should be noted that when starting to charge the battery, it can first be determined whether the storage duration of the battery is greater than a preset duration. In the case where the storage duration is greater than the preset duration, the battery is charged with the initial charging current. For the convenience of subsequent introduction, the period of charging the battery with the initial charging current is hereinafter referred to as the initial charging period. The current charging period in this step can be the initial charging period, or any charging period except the last charging period after the initial charging period.

[0087] In the case where the current charging period can be the initial charging period, the first internal resistance is the initial internal resistance. In the case where the current charging period is a charging period after the initial charging period, the first internal resistance is the internal resistance of the battery in this charging period. Among them, the initial charging period is the first charging period.

[0088] In a possible implementation manner, the first voltage of the battery can be obtained when the charging duration is less than the charging duration threshold and the difference between the charging duration and the charging duration threshold is equal to a preset difference; the second voltage of the battery can be obtained when the charging duration is equal to the charging duration threshold; the second internal resistance of the battery is determined according to the voltage difference between the second voltage and the first voltage and the first charging current. The charging duration threshold can be set to a value between 30 seconds and 3 minutes.

[0089] Exemplarily, if the charging duration threshold is 1 minute and the preset difference is 10 seconds, in the initial charging stage of charging the battery with the initial charging current, the charging duration of charging the battery with the initial charging current can be obtained, and the first voltage of the battery can be obtained when the charging duration is 50 seconds, that is, the difference from the charging duration threshold is 10 seconds, and the second voltage of the battery can be obtained when the charging duration is equal to 60 seconds. The quotient obtained by dividing the voltage difference between the second voltage and the first voltage by the initial charging current is used as the second internal resistance of the battery in the next charging period. Or, the result obtained by multiplying this quotient by a preset coefficient is used as the second internal resistance. Among them, the next charging period is the next charging period after the initial charging period. In the case where the charging duration threshold is 1 minute, the next charging period refers to the charging period between 1 minute and 2 minutes.

[0090] In another possible implementation, an internal resistance prediction model can be used to determine the second internal resistance of the battery in the next charging period based on the charging duration of charging the battery with the first charging current and the first internal resistance of the battery in the current charging period. The internal resistance prediction model can be a model obtained by training an initial internal resistance prediction model based on a training set. The training set can include the charging duration samples and internal resistance samples in the charging period of charging the battery sample with the first charging current sample, and the actual internal resistance of the battery sample in the next charging period of this charging period.

[0091] S202. Determine the second charging current in the next charging period according to the first internal resistance, the second internal resistance, and the heat control condition of the battery; the heat control condition includes that the first heat generation of the battery when using the first charging current within the same duration is less than or equal to the second heat generation of the battery when using the second charging current.

[0092] In one possible implementation, the internal resistance change rate can be determined according to the first internal resistance and the second internal resistance; the heat generation ratio can be determined according to the internal resistance change rate and the preset current change rate; the target current change rate can be determined based on the heat generation ratio and the heat control condition; the second charging current can be determined according to the target current change rate and the first charging current. Among them, the heat generation ratio is used to represent the ratio of the heat generation of the battery obtained based on the preset current change rate to the first heat generation.

[0093] The intermediate heat generation and the first heat generation can be calculated according to Joule's law Q = Q represents heat, I represents current, R represents internal resistance, and t represents charging duration. Since the intermediate heat generation = , where represents the intermediate charging current obtained based on the preset current change rate and the first charging current, represents the second internal resistance. The first heat generation = , represents the first charging current, represents the first internal resistance. Since , , represents the internal resistance change rate, so the heat generation ratio of the heat generation of the battery obtained based on the preset current change rate to the first heat generation = . Among them, is the preset current change rate, and the preset current change rate can be set to 0 or other values very close to 0.

[0094] After that, a target current change rate is determined based on the heat generation ratio and the heat control condition; a second charging current is determined according to the target current change rate and the first charging current. If the heat generation ratio is not less than a preset ratio, it means that the heat generation ratio meets the heat control condition, and the preset current change rate can be used as the target current change rate. Then, the second charging current is determined according to the target current change rate and the first charging current. If the heat generation ratio is less than the preset ratio, it means that the heat generation ratio does not meet the heat control condition, and the value needs to be adjusted to obtain a new current change rate until the heat generation ratio determined by the new current change rate meets the heat control condition. The current change rate corresponding to the heat generation ratio that meets the heat control condition is used as the target current change rate, and then the second charging current is determined according to the target current change rate and the first charging current. Among them, the preset ratio is greater than or equal to 1. It should be noted that when the preset ratio is 1, if it is greater than 0, the determined target current change rate can be equal to 0 or less than 0. If if it is less than or equal to 0, the determined target current change rate is greater than 0.

[0095] In another possible implementation, an internal resistance ratio of the second internal resistance to the first internal resistance can be determined; a heat generation ratio is determined based on the preset current change rate, the first charging current, and the internal resistance ratio, and a target current change rate is determined based on the heat generation ratio and the heat control condition; a second charging current is determined according to the target current change rate and the first charging current. Among them, the intermediate charging current is obtained based on the preset current change rate and the first charging current.

[0096] Among them, according to Joule's law Q = the intermediate heat generation and the first heat generation can be calculated. Q represents heat, I represents current, R represents internal resistance, and t represents the charging duration. For example, the intermediate heat generation = , where represents the intermediate charging current, represents the second internal resistance. The first heat generation = , represents the first charging current, represents the first internal resistance. Since , is the preset current change rate. Therefore, the heat generation ratio of the intermediate heat generation to the first heat generation = .

[0097] S203. When the battery enters the next charging period, the battery is charged according to the second charging current.

[0098] When the battery enters the next charging period, it can be determined whether the state of charge of the battery is less than a preset state of charge. If the state of charge of the battery is less than the preset state of charge, the battery can be charged at a second charging current.

[0099] Alternatively, when the battery enters the next charging period, if the state of charge of the battery is less than the preset state of charge and the battery temperature is less than the preset temperature, the battery can be charged at a second charging current. If the state of charge of the battery is less than the preset state of charge, but the battery temperature is not less than the preset temperature, the charging current can be obtained based on the charging performance test data, that is, the battery can be charged using the conventional charging method, which can reduce the frequency of adjusting the charging current.

[0100] The method provided in this embodiment, when the shelf time of the battery is greater than the preset time, determines the second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery using the first charging current in the current charging period and the first internal resistance of the battery in the current charging period. According to the first internal resistance, the second internal resistance and the heat control condition of the battery, the second charging current in the next charging period is determined. When the battery enters the next charging period, the battery is charged at the second charging current. Since the second charging current determined based on the heat control condition can ensure that the heat generation of the battery using the second charging current in the next charging period is not lower than the heat generation in the current charging period, the temperature rise rate of the battery can be taken into account, thereby achieving both the charging efficiency and the service life of the battery.

[0101] In one embodiment, as Figure 4 shown, Figure 4 is a schematic flowchart of a method for determining a second charging current provided by an embodiment of the present application. This embodiment relates to a possible implementation manner of determining the second charging current according to the first internal resistance, the second internal resistance and the heat control condition of the battery. On the basis of the above embodiment, the method includes the following steps:

[0102] S301, determine the internal resistance change rate according to the first internal resistance and the second internal resistance.

[0103] The internal resistance difference between the second internal resistance and the first internal resistance can be determined, and the result obtained by dividing the internal resistance difference by the first internal resistance is used as the internal resistance change rate.

[0104] S302, determine the heat generation ratio according to the internal resistance change rate and the preset current change rate; the heat generation ratio is used to characterize the ratio of the heat generation of the battery obtained based on the preset current change rate to the first heat generation.

[0105] The heat generation ratio can be calculated according to Joule's law Q = The heat generation ratio can be equal to , where is a preset current change rate, and the preset current change rate can be set to 0 or other values very close to 0. Or, multiply the result obtained by a preset coefficient to get the heat generation ratio.

[0106] S303. Determine the target current change rate based on the heat generation ratio and the heat control condition;

[0107] If the heat generation ratio meets the heat control condition, use the preset current change rate as the target current change rate;

[0108] If the heat generation ratio does not meet the heat control condition, adjust the preset current change rate to obtain the target current change rate; the target current change rate is the current change rate for which the heat generation ratio obtained based on the target current change rate meets the heat control condition.

[0109] Among them, if the heat generation ratio is greater than or equal to the preset ratio, it can be determined that the heat generation ratio meets the heat control condition.

[0110] S304. Determine the second charging current according to the target current change rate and the first charging current.

[0111] Determine the second charging current according to the target current change rate and the first charging current, which can be achieved by the following method:

[0112] Determine the product of the first charging current and the target current change rate, and use the sum of the product and the first charging current as the second charging current.

[0113] The method provided in this embodiment determines the internal resistance change rate according to the first internal resistance and the second internal resistance, determines the heat generation ratio according to the internal resistance change rate and the preset current change rate, determines the target current change rate based on the heat generation ratio and the heat control condition, and determines the second charging current according to the target current change rate and the first charging current. By determining the heat generation ratio based on the internal resistance change rate, it is possible to obtain the heat generation ratio without calculating the specific values of the heat generation of the battery and the first heat generation based on the preset current change rate, thereby improving the efficiency of obtaining the heat generation ratio and further improving the efficiency of obtaining the second charging current.

[0114] In one embodiment, the above S303, determining the target current change rate based on the heat generation ratio and the heat control condition, can be achieved by the following method:

[0115] If the heat generation ratio meets the heat control condition, use the preset current change rate as the target current change rate;

[0116] If the heat generation ratio does not meet the heat control condition, adjust the preset current change rate to obtain a target current change rate; the target current change rate is the current change rate at which the heat generation ratio obtained based on the target current change rate meets the heat control condition.

[0117] For the method provided in this embodiment, if the heat generation ratio meets the heat control condition, the preset current change rate can be directly used as the target current change rate. If the heat generation ratio does not meet the heat control condition, the preset current change rate is adjusted to obtain a target current change rate that meets the heat control condition, laying a foundation for determining the second charging current based on the target current change rate.

[0118] In one embodiment, as Figure 5 shown, Figure 5 FIG. is a flowchart of a method for obtaining a target current change rate provided by an embodiment of the present application. This embodiment relates to a possible implementation manner of how to adjust the preset current change rate to obtain a target current change rate. Based on the above embodiment, the method includes the following steps:

[0119] S401, adjust the preset current change rate according to a preset adjustment amplitude.

[0120] The preset adjustment amplitude is, for example, 0.5%. The sum of and 0.5% can be used as the new current change rate obtained after the current adjustment. If is equal to 0, the new current change rate obtained after the current adjustment is 0.5%.

[0121] S402, determine a new heat generation ratio according to the internal resistance change rate and the new current change rate obtained after the current adjustment.

[0122] Among them, combined with the above example, the new heat generation ratio can be equal to .

[0123] S403, if the new heat generation ratio does not meet the heat control condition, return to execute the step of adjusting the new current change rate according to the preset adjustment amplitude until the new heat generation ratio obtained after the most recent adjustment meets the heat control condition, and use the new current change rate obtained after the most recent adjustment as the target current change rate.

[0124] If does not meet the heat control condition, continue to adjust according to the preset adjustment amplitude. The new current change rate obtained after this adjustment is 1%. The new heat generation ratio obtained after this adjustment can be obtained. Then the new heat generation ratio obtained after this adjustment can be equal to . If meets the heat control condition, use 1% as the target current change rate.

[0125] The method provided in this embodiment adjusts the preset current change rate according to a preset adjustment range, determines a new heat generation ratio based on the internal resistance change rate and the new current change rate obtained after the current adjustment. If the new heat generation ratio does not meet the heat control condition, return to execute the step of adjusting the new current change rate according to the preset adjustment range until the new heat generation ratio obtained after the last adjustment meets the heat control condition, and use the new current change rate obtained after the last adjustment as the target current change rate, thereby realizing the determination of the target current change rate, laying a foundation for determining the second charging current based on the target current change rate.

[0126] In one embodiment, the target current change rate can also be obtained in the following manner:

[0127] If the new heat generation ratio meets the heat control condition, use the new current change rate obtained after the current adjustment as the target current change rate.

[0128] Combined with the above example, if meets the heat control condition, then use as the target current change rate.

[0129] The method provided in this embodiment realizes the determination of the target current change rate by using the new current change rate obtained after the current adjustment as the target current change rate if the new heat generation ratio meets the heat control condition, laying a foundation for determining the second charging current based on the target current change rate.

[0130] In one embodiment, the following steps may also be included:

[0131] If the heat generation ratio is greater than or equal to the preset ratio, it is determined that the heat generation ratio meets the heat control condition.

[0132] Exemplarily, if the preset ratio is 1, when the heat generation ratio is greater than or equal to 1, it can be determined that the heat generation ratio meets the heat control condition.

[0133] The method provided in this embodiment can make the target current change rate determined based on the heat generation ratio and the heat control condition meet the heat control condition by determining that the heat generation ratio meets the heat control condition if the heat generation ratio is greater than or equal to the preset ratio. Furthermore, the determined second charging current meets the heat control condition, that is, the heat generation during the second charging stage of charging the battery with the second charging current is not lower than the heat generation during the first charging stage.

[0134] In one embodiment, as Figure 6 shown, Figure 6It is a schematic flowchart of a method for determining the heat generation ratio provided by an embodiment of the present application. This embodiment relates to a possible implementation manner of determining the heat generation ratio of the intermediate heat generation to the first heat generation when charging the battery with an intermediate charging current according to the internal resistance change rate. On the basis of the above embodiment, the above S302 includes the following steps:

[0135] S501, determine the first summation result of the preset value and the preset current change rate, and determine the second summation result of the preset value and the internal resistance change rate.

[0136] S502, determine the heat generation ratio according to the product of the square of the first summation result and the second summation result.

[0137] The preset value is, for example, 1, and the heat generation ratio can be determined according to the product. This product can be used as the heat generation ratio, or the result obtained by multiplying this product by a preset coefficient can be used as the heat generation ratio.

[0138] The method provided in this embodiment determines the heat generation ratio by determining the first summation result of the preset value and the preset current change rate, and determining the second summation result of the preset value and the internal resistance change rate, and according to the product of the square of the first summation result and the second summation result. Since the heat generation ratio can be determined without specifically calculating the values of the intermediate heat generation and the first heat generation, the determination efficiency of the heat generation ratio is improved.

[0139] In one embodiment, for the above S502, determining the heat generation ratio according to the product of the square of the first summation result and the second summation result can be implemented in the following manner:

[0140] Take the product of the square of the first summation result and the second summation result as the heat generation ratio.

[0141] The method provided in this embodiment takes the product of the square of the first summation result and the second summation result as the heat generation ratio. Since the heat generation ratio can be determined without specifically calculating the values of the intermediate heat generation and the first heat generation, the determination efficiency of the heat generation ratio is improved.

[0142] In one embodiment, as Figure 7 shown, Figure 7 It is a schematic flowchart of a method for determining the second internal resistance provided by an embodiment of the present application. This embodiment relates to a possible implementation manner of determining the second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery with the first charging current in the current charging period and the first internal resistance of the battery in the current charging period. On the basis of the above embodiment, the above S202 includes the following steps:

[0143] S601, when the charging duration is less than the charging duration threshold and the difference between the charging duration and the charging duration threshold is equal to the preset difference, obtain the first voltage of the battery.

[0144] S602, when the charging duration is equal to the charging duration threshold, obtain the second voltage of the battery.

[0145] S603, determine the second internal resistance of the battery according to the voltage difference between the second voltage and the first voltage and the first charging current.

[0146] Exemplarily, if the charging duration threshold is 1 minute and the preset difference is 10 seconds, in the initial charging stage of charging the battery with the initial charging current, the charging duration of charging the battery with the initial charging current can be obtained, and the first voltage of the battery can be obtained when the charging duration is 50 seconds, that is, the difference from the charging duration threshold is 10 seconds. The second voltage of the battery is obtained when the charging duration is equal to 60 seconds. The quotient obtained by dividing the voltage difference between the second voltage and the first voltage by the initial charging current is used as the second internal resistance of the battery in the next charging period. Alternatively, the result obtained by multiplying the quotient by the preset coefficient is used as the second internal resistance. Herein, the next charging period is the next charging period of the initial charging period. When the charging duration threshold is 1 minute, the next charging period refers to the charging period between 60 seconds and 120 seconds. For the convenience of subsequent introduction, the charging period between 60 seconds and 120 seconds is denoted as charging period A. Then, the second charging current of charging period A can be determined according to the initial internal resistance, the second internal resistance in charging period A, and the heat control condition. If the second charging current in charging period A is denoted as charging current A.

[0147] As the battery charging time progresses, when the battery enters charging period A, charging period A is the current charging period, and charging current A is used as the first charging current. The second internal resistance of the battery in the next charging period of charging period A can be determined according to the charging duration of charging the battery with charging current A in charging period A and the first internal resistance of the battery in charging period A. Herein, if the next charging period of charging period A is denoted as charging period B, then charging period B is the charging period between 120 seconds and 180 seconds.

[0148] Then, the second charging current of charging period B can be determined according to the first internal resistance of charging period A, the second internal resistance in charging period B, and the heat control condition.

[0149] When the battery enters charging period B, charging period B is the current charging period, and the second charging current of charging period B is used as the first charging current of the current charging period. Similar to the method of determining the second internal resistance of the battery in the next charging period of charging period A when the battery enters charging period A, the second internal resistance of the battery in the next charging period of charging period B can be determined.

[0150] The method provided in this embodiment obtains a first voltage of the battery when the charging time is less than a charging time threshold and the difference between the charging time and the charging time threshold is equal to a preset difference, obtains a second voltage of the battery when the charging time is equal to the charging time threshold, and determines a second internal resistance of the battery according to the voltage difference between the second voltage and the first voltage and the first charging current. Since the second voltage is obtained when the charging time is equal to the charging time threshold, and then the second internal resistance is obtained, it is convenient to quickly determine the second charging current based on the second internal resistance after entering the next charging period, so that the battery can be quickly charged according to the second charging current in the next charging period, thereby improving the charging efficiency.

[0151] In one embodiment, the step of “charging the battery according to the second charging current” in S203 may include the following steps:

[0152] When the state of charge of the battery is less than a preset state of charge and the battery temperature of the battery is less than a preset temperature, the battery is charged according to the second charging current.

[0153] The method provided in this embodiment can improve the service life of the battery when the battery temperature is low by charging the battery according to the second charging current when the battery state of charge is less than a preset state of charge and the battery temperature is less than a preset temperature.

[0154] In one embodiment, if the current charging period is the first charging period, the above S201, when the shelf time of the battery is greater than the preset time, determines the second internal resistance of the battery in the next charging period of the current charging period according to the charging time of the battery using the first charging current in the current charging period and the first internal resistance of the battery in the current charging period, which can be achieved by the following method:

[0155] In the case where the shelf time of the battery is greater than the preset time, if the battery temperature of the battery is less than the preset temperature, a second internal resistance of the battery in a charging period next to the first charging period is determined according to the charging time of the battery using the initial charging current in the first charging period and the initial internal resistance of the battery in the first charging period;

[0156] Among them, the initial charging current is determined according to the charging performance test data of the sample battery, the initial battery temperature when the battery enters the first charging period, and the initial state of charge. The charging performance test data is used to characterize the corresponding relationship among the battery temperature, the state of charge, and the charging current; the initial internal resistance is determined according to the internal resistance test data of the sample battery, the initial battery temperature, and the initial state of charge.

[0157] The charging performance test data is shown in Table 1 below, for example. The first row in Table 1 represents the proportion of SOC. For example, 5% SOC means that the remaining power of the battery is only 5% of its total capacity. The first column represents the battery temperature in °C. Exemplarily, when the initial state of charge is in the range of 0 to 5% and the battery temperature is -20°C, the charging current A1 can be used as the initial charging current. Another exemplarily, when the initial state of charge is in the range of 5% to 10% and the battery temperature is -15°C, the charging current B1 or the charging current B2 can be used as the initial charging current.

[0158] Table 1

[0159]

[0160] The internal resistance test data is shown in Table 2 below, for example. The first row in Table 2 represents the proportion of SOC, and the first column represents the battery temperature in °C. Similar to the determination of the initial charging current above, the initial internal resistance can be determined based on the internal resistance test data.

[0161] Table 2

[0162]

[0163] Since when the storage duration of the battery is greater than the preset duration, it may cause the battery temperature to be relatively low. Based on Figure 1 the analysis shown, when the battery is stored at a low temperature such as -20°C for the same duration as when it is stored at 25°C, the attenuation of the charging current of the battery at low temperature (15%) is greater than the attenuation of the charging current of the battery at 25°C (6%). Therefore, when the method of this embodiment is used at low temperature, compared with using the method provided in this embodiment at other temperatures, the service life of the battery can be better improved.

[0164] For the method provided in this embodiment, when the current charging period is the first charging period, if the battery temperature of the battery is less than the preset temperature, then according to the charging duration of the battery using the initial charging current in the first charging period and the initial internal resistance of the battery in the first charging period, the second internal resistance of the battery in the next charging period after the first charging period is determined, so that the second internal resistance of the battery in the next charging period after the first charging period can be realized, providing a relatively reliable basis for determining the second charging current in the subsequent next charging period and facilitating a more accurate determination of the second charging current.

[0165] In one embodiment, as Figure 8 shown, Figure 8 is a schematic diagram of the overall process of a battery charging method provided by an embodiment of the present application. The method includes the following steps:

[0166] S701, based on the charging performance test data, the initial battery temperature and the initial state of charge when the battery is charged, determine the initial charging current of the battery, and based on the internal resistance test data, the initial battery temperature and the initial state of charge, determine the initial internal resistance of the battery.

[0167] S702, determine whether the shelf duration is greater than a preset duration.

[0168] If the shelf duration is greater than the preset duration, then execute S703; if the shelf duration is not greater than the preset duration, then execute S704.

[0169] S703, determine whether the battery temperature of the battery is less than a preset temperature.

[0170] If the battery temperature is less than the preset temperature, then execute S705; if the battery temperature is not less than the preset temperature, then execute S704.

[0171] S704, charge the battery using the current charging method.

[0172] Charge using the conventional charging method until the SOC is greater than or equal to the preset SOC. The current charging method can be a method of charging the battery with the charging current obtained based on the charging performance test data.

[0173] S705, charge the battery with the initial charging current.

[0174] S706, based on the charging duration of charging the battery with the first charging current and the first internal resistance of the battery at the current charging period when charging the battery with the first charging current, determine the second internal resistance of the battery at the next charging period.

[0175] S707, determine the internal resistance change rate according to the first internal resistance and the second internal resistance.

[0176] The first internal resistance in this step is the initial internal resistance.

[0177] S708, obtain the preset current change rate.

[0178] The preset current change rate is, for example, 0.

[0179] S709, according to the internal resistance change rate, determine whether the heat generation ratio of the intermediate heat generation to the first heat generation when charging the battery with the intermediate charging current is greater than the preset ratio.

[0180] If the heat generation ratio is less than the preset ratio, then execute S710. If the heat generation ratio is not less than the preset ratio, then execute S711.

[0181] S710, adjust the preset current change rate to obtain the target current change rate.

[0182] S711, determine the second charging current according to the target current change rate and the first charging current.

[0183] S712, use the second charging current as the charging current for the next charging period.

[0184] S713, determine whether the SOC of the battery is greater than or equal to the preset SOC.

[0185] If it is greater than or equal to the preset SOC, end the charging process; if the SOC of the battery is less than the preset SOC, return to execute S703.

[0186] Refer to Figure 9 and Figure 10 , Figure 9 is a simulation schematic diagram of the relationship between the battery temperature and the SOC during the battery charging process provided by the embodiment of the present application, Figure 10 is a comparison schematic diagram of the current change rate in a traditional charging method provided by the embodiment of the present application and the current change rate provided by the embodiment of the present application. Among them, Figure 9 the abscissa represents the SOC, and the ordinate represents the battery temperature, with the unit of degree Celsius; Figure 10 the abscissa is the battery temperature, and the ordinate is the current change rate of the charging current. From Figure 9 it can be seen that when the battery temperature is less than 0 degree Celsius, the current change rate in the embodiment of the present application is less than the current change rate in the traditional charging method, and the change rate of the battery temperature is greater than the change rate of the SOC. Therefore, the influence of the battery temperature on the charging current is greater, and by Figure 10 the relationship between the battery temperature and the current change rate of the charging current is shown. Figure 10 the curve 91 in represents the corresponding relationship between the current change rate in the traditional charging method and the battery temperature, and the curve 92 represents the corresponding relationship between the target current change rate in the charging method in the embodiment of the present application and the battery temperature. Exemplarily, the preset temperature is 0 degree Celsius. From Figure 10 it can be seen that when the temperature is less than 0 degree Celsius, at the same temperature, the charging current in the embodiment of the present application is less than the charging current in the traditional charging method, and the heat generation of the battery using the second charging current in the next charging period is not less than the heat generation in the current charging period. Therefore, the temperature rise rate of the battery can be taken into account, thereby achieving both the charging efficiency and the service life of the battery. Among them, Figure 10 the current change rate in is according to the heat generation ratio = 1, and the internal resistance change rate calculated according to the embodiments of the present application The determined result.

[0187] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0188] Based on the same inventive concept, the embodiments of the present application also provide a battery charging device for implementing the battery charging method involved above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the battery charging device provided below can refer to the limitations on the battery charging method in the above text, and will not be repeated here.

[0189] In one embodiment, as Figure 11 shown, Figure 11 is a schematic structural diagram of a battery charging device provided by an embodiment of the present application. The device 1000 includes:

[0190] The first determination module 1001 is configured to, when the storage duration of the battery is greater than a preset duration, determine the second internal resistance of the battery in the next charging period according to the charging duration of the battery with the first charging current in the current charging period and the first internal resistance of the battery in the current charging period;

[0191] The second determination module 1002 is configured to determine the second charging current in the next charging period according to the first internal resistance, the second internal resistance, and the heat control condition of the battery; the heat control condition includes that the first heat generation of the battery when using the first charging current within the same duration is less than or equal to the second heat generation of the battery when using the second charging current;

[0192] The charging module 1003 is configured to charge the battery with the second charging current when the battery enters the next charging period.

[0193] In one embodiment, the second determination module 1002 includes:

[0194] The first determination unit is configured to determine the internal resistance change rate according to the first internal resistance and the second internal resistance;

[0195] A second determination unit, configured to determine a heat generation ratio according to an internal resistance change rate and a preset current change rate; the heat generation ratio is used to characterize the ratio of the heat generation of the battery obtained based on the preset current change rate to the first heat generation.

[0196] A third determination unit, configured to determine a target current change rate based on the heat generation ratio and a heat control condition.

[0197] A fourth determination unit, configured to determine a second charging current according to the target current change rate and a first charging current.

[0198] In one embodiment, the third determination unit is specifically configured to, if the heat generation ratio meets the heat control condition, use the preset current change rate as the target current change rate.

[0199] If the heat generation ratio does not meet the heat control condition, adjust the preset current change rate to obtain a target current change rate; the target current change rate is a current change rate for which the heat generation ratio obtained based on the target current change rate meets the heat control condition.

[0200] In one embodiment, the third determination unit is specifically configured to adjust the preset current change rate according to a preset adjustment amplitude; determine a new heat generation ratio according to the internal resistance change rate and the new current change rate obtained after the current adjustment; if the new heat generation ratio does not meet the heat control condition, return to execute the step of adjusting the new current change rate according to the preset adjustment amplitude until the new heat generation ratio obtained after the most recent adjustment meets the heat control condition, and use the new current change rate obtained after the most recent adjustment as the target current change rate.

[0201] In one embodiment, the third determination unit is further configured to, if the new heat generation ratio meets the heat control condition, use the new current change rate obtained after the current adjustment as the target current change rate.

[0202] In one embodiment, the third determination unit is further configured to, if the heat generation ratio is greater than or equal to a preset ratio, determine that the heat generation ratio meets the heat control condition.

[0203] In one embodiment, the second determination unit is specifically configured to determine a first summation result of a preset value and the preset current change rate, and determine a second summation result of the preset value and the internal resistance change rate; determine the heat generation ratio according to the product of the square of the first summation result and the second summation result.

[0204] In one embodiment, the second determination unit is specifically configured to use the product of the square of the first summation result and the second summation result as the heat generation ratio.

[0205] In one embodiment, the first determination module 1001 is specifically configured to obtain a first voltage of the battery when the charging duration is less than a charging duration threshold and the difference between the charging duration and the charging duration threshold is equal to a preset difference; obtain a second voltage of the battery when the charging duration is equal to the charging duration threshold; and determine a second internal resistance of the battery according to the voltage difference between the second voltage and the first voltage and a first charging current.

[0206] In one embodiment, the third determination module 1003 is specifically configured to charge the battery with a second charging current when the state of charge of the battery is less than a preset state of charge and the battery temperature is less than a preset temperature.

[0207] In one embodiment, when the current charging period is the first charging period, the first determination module 1001 is specifically configured to, when the battery's storage duration is greater than a preset duration and the battery temperature is less than a preset temperature, determine a second internal resistance of the battery in the next charging period of the first charging period according to the charging duration of the battery with an initial charging current in the first charging period and the initial internal resistance of the battery in the first charging period.

[0208] Wherein, the initial charging current is determined according to the charging performance test data of the sample battery, the initial battery temperature and the initial state of charge when the battery enters the first charging period, and the charging performance test data is used to characterize the corresponding relationship between the battery temperature, the state of charge and the charging current; the initial internal resistance is determined according to the internal resistance test data of the sample battery, the initial battery temperature and the initial state of charge.

[0209] Each module in the above battery charging device can be implemented in whole or in part by software, hardware and their combination. The above modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0210] In one embodiment, a computer device is provided. The computer device can be a server, and its internal structure diagram can be as Figure 12 shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Wherein, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store XX data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a battery charging method.

[0211] Those skilled in the art can understand that Figure 12 the structure shown in Figure 12 is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0212] In one embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, the steps of any of the above method embodiments are implemented. The technical principle and technical effect are similar and will not be elaborated here.

[0213] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above method embodiments are implemented. The technical principle and technical effect are similar and will not be elaborated here.

[0214] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps of any of the above method embodiments are implemented. The technical principle and technical effect are similar and will not be elaborated here.

[0215] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data that have been authorized by the user or fully authorized by all parties.

[0216] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0217] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0218] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery charging method, characterized in that, The method includes: When the storage duration of the battery is greater than a preset duration, determining a second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery with a first charging current in the current charging period and the first internal resistance of the battery in the current charging period; Determining a second charging current for the next charging period according to the first internal resistance, the second internal resistance, and the heat control condition of the battery; the heat control condition includes that the first heat generation of the battery when using the first charging current within the same duration is less than or equal to the second heat generation of the battery when using the second charging current; When the battery enters the next charging period, charging the battery according to the second charging current.

2. The method according to claim 1, wherein The determining the second charging current according to the first internal resistance, the second internal resistance, and the heat control condition of the battery includes: Determining an internal resistance change rate according to the first internal resistance and the second internal resistance; Determining a heat generation ratio according to the internal resistance change rate and a preset current change rate; the heat generation ratio is used to represent the ratio of the heat generation of the battery obtained based on the preset current change rate to the first heat generation; Determining a target current change rate based on the heat generation ratio and the heat control condition; Determining the second charging current according to the target current change rate and the first charging current.

3. The method according to claim 2, wherein The determining the target current change rate based on the heat generation ratio and the heat control condition includes: If the heat generation ratio meets the heat control condition, using the preset current change rate as the target current change rate; If the heat generation ratio does not meet the heat control condition, adjusting the preset current change rate to obtain the target current change rate; the target current change rate is the current change rate for which the heat generation ratio obtained according to the target current change rate meets the heat control condition.

4. The method according to claim 3, characterized in that, The adjusting the preset current change rate to obtain the target current change rate includes: Adjusting the preset current change rate according to a preset adjustment amplitude; Determining a new heat generation ratio according to the internal resistance change rate and the new current change rate obtained after the current adjustment; If the new heat generation ratio does not meet the heat control condition, returning to execute the step of adjusting the new current change rate according to the preset adjustment amplitude until the new heat generation ratio obtained after the most recent adjustment meets the heat control condition, and using the new current change rate obtained after the most recent adjustment as the target current change rate.

5. The method according to claim 4, characterized in that, The method further includes: If the new heat generation ratio meets the heat control condition, using the new current change rate obtained after the current adjustment as the target current change rate.

6. The method according to any one of claims 3 to 5, characterized in that, The method further includes: If the heat generation ratio is greater than or equal to a preset ratio, determining that the heat generation ratio meets the heat control condition.

7. The method according to any one of claims 2-5, characterized in that, The determining the heat generation ratio according to the internal resistance change rate and the preset current change rate includes: Determining a first summation result of a preset value and the preset current change rate, and determining a second summation result of the preset value and the internal resistance change rate; Determine the heat generation ratio according to the product of the square of the first summation result and the second summation result.

8. The method according to claim 7, wherein The determining the heat generation ratio according to the product of the square of the first summation result and the second summation result includes: Taking the product of the square of the first summation result and the second summation result as the heat generation ratio.

9. The method according to any one of claims 1-5, characterized in that, The determining the second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery with a first charging current in the current charging period and the first internal resistance of the battery in the current charging period includes: When the charging duration is less than the charging duration threshold and the difference between the charging duration and the charging duration threshold is equal to a preset difference, obtaining the first voltage of the battery; When the charging duration is equal to the charging duration threshold, obtaining the second voltage of the battery; Determining the second internal resistance of the battery according to the voltage difference between the second voltage and the first voltage and the first charging current.

10. The method according to any one of claims 1-5, characterized in that, The charging the battery according to the second charging current includes: When the state of charge of the battery is less than a preset state of charge and the battery temperature is less than a preset temperature, charging the battery according to the second charging current.

11. The method according to any one of claims 1 to 5, characterized in that, When the current charging period is the first charging period, in the case where the storage duration of the battery is greater than a preset duration, the determining the second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery with a first charging current in the current charging period and the first internal resistance of the battery in the current charging period includes: In the case where the storage duration of the battery is greater than a preset duration, if the battery temperature is less than a preset temperature, determining the second internal resistance of the battery in the next charging period of the first charging period according to the charging duration of the battery with an initial charging current in the first charging period and the initial internal resistance of the battery in the first charging period; Wherein, the initial charging current is determined according to the charging performance test data of the sample battery, the initial battery temperature and the initial state of charge when the battery enters the first charging period, and the charging performance test data is used to characterize the corresponding relationship between the battery temperature, the state of charge and the charging current; the initial internal resistance is determined according to the internal resistance test data of the sample battery, the initial battery temperature and the initial state of charge.

12. A battery charging device, characterized in that, The device includes: A first determination module, configured to, in the case where the storage duration of the battery is greater than a preset duration, determine the second internal resistance of the battery in the next charging period of the current charging period according to the charging duration of the battery with a first charging current in the current charging period and the first internal resistance of the battery in the current charging period; A second determination module, configured to determine a second charging current for the next charging period according to the first internal resistance, the second internal resistance, and the heat control condition of the battery; the heat control condition includes that the first heat generation of the battery when the first charging current is adopted within the same time period is less than or equal to the second heat generation of the battery when the second charging current is adopted. A charging module, configured to charge the battery according to the second charging current when the battery enters the next charging period.

13. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 11 are implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 11 are implemented.

15. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 11 are implemented.

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