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

Abstract

The present application relates to a battery charging method, apparatus, computer equipment, storage medium, and program product. The method includes: when the battery has been idle for longer than a preset time, determining the second internal resistance of the battery in the next charging period after the current charging period based on the charging time of the battery using a first charging current in the current charging period and the first internal resistance of the battery in the current charging period; determining the second charging current for the next charging period based on the first internal resistance, the second internal resistance, and the thermal control condition of the battery; and charging the battery according to the second charging current when the battery enters the next charging period. Because the second charging current is determined based on the thermal control condition, the heat generated by the battery using the second charging current in the next charging period is not less than the heat generated in the current charging period, and the temperature rise rate of the battery can be taken into account, thereby achieving a balance between charging efficiency and battery service life.

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. Users have higher requirements for battery life and charging efficiency. However, the battery life and charging efficiency are affected by the battery charging method. Therefore, how to charge the battery to take into account both 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 address the above technical problems.

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

[0005] When the battery has been idle for longer than a preset time, determining a second internal resistance of the battery in a charging period subsequent to the current charging period based on a charging time of the battery using the first charging current in the current charging period and a first internal resistance of the battery in the current charging period;

[0006] determining a second charging current for a next charging period based on the first internal resistance, the second internal resistance, and a heat control condition of the battery; the heat control condition including that a first heat generation of the battery when using the first charging current is less than or equal to a second heat generation of the battery when using the second charging current for the same length of time;

[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, when the battery has been idle for longer than a preset time, the second internal resistance of the battery in the next charging period following the current charging period based on the duration of charging the battery using a first charging current in the current charging period and the first internal resistance of the battery in the current charging period. The method then determines a second charging current for the next charging period based on the first and second internal resistances and the battery's thermal control conditions. When the battery enters the next charging period, the battery is charged according to the second charging current. Because the second charging current determined based on the thermal control conditions ensures that the heat generated by the battery in the next charging period using the second charging current is no less than the heat generated in the current charging period, it is possible to achieve a balanced balance between the battery's temperature rise rate and, therefore, both charging efficiency and battery life.

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

[0010] determining an internal resistance change rate based on the first internal resistance and the second internal resistance;

[0011] Determining a heat generation ratio based on the internal resistance change rate and the 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;

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

[0013] The second charging current is determined according to the target current change rate and the first charging current.

[0014] The method provided in this embodiment determines the internal resistance change rate based on the first internal resistance and the second internal resistance, determines the heat generation ratio based on 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 based on the target current change rate and the first charging current. By determining the heat generation ratio based on the internal resistance change rate, the heat generation ratio can be obtained without calculating the specific values ​​of the heat generation of the battery obtained based on the preset current change rate and the first heat generation, 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 the target current change rate based on the heat generation ratio and the heat control condition includes:

[0016] If the heat generation ratio satisfies the heat control condition, the preset current change rate is used as the target current change rate;

[0017] 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; the target current change rate is the current change rate at which the heat generation ratio obtained according to the target current change rate meets the heat control condition.

[0018] In the method provided in this embodiment, if the heat generation ratio satisfies 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 the target current change rate that meets the heat control condition, laying the foundation for determining the second charging current based on the target current change rate.

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

[0020] Adjust the preset current change rate according to the preset adjustment range;

[0021] Determine the new heat generation ratio according to the internal resistance change rate and the new current change rate obtained after the current adjustment;

[0022] If the new heat production ratio does not meet the heat control condition, the process returns to the step of adjusting the new current change rate according to the preset adjustment range until the new heat production ratio obtained after the most recent adjustment meets the heat control condition, and the new current change rate obtained after the most recent adjustment is used as the target current change rate.

[0023] 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 previous adjustment, and if the new heat generation ratio does not meet the heat control condition, returns to the step of adjusting the new current change rate according to the preset adjustment range until the new heat generation ratio obtained after the most recent adjustment meets the heat control condition, and uses the new current change rate obtained after the most recent adjustment as the target current change rate, thereby determining the target current change rate, laying the foundation for determining the second charging current based on the target current change rate.

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

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

[0026] The method provided in this embodiment determines 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 production ratio meets the heat control condition, thereby laying the foundation for determining the second charging current based on the target current change rate.

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

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

[0029] The method provided in this embodiment determines that the heat generation ratio satisfies the heat control condition if the heat generation ratio is greater than or equal to a preset ratio. This enables the target current change rate determined based on the heat generation ratio and the heat control condition to satisfy the heat control condition, and further enables the determined second charging current to satisfy the heat control condition. That is, the heat generation in the second charging stage of charging the battery using the second charging current is not less than the heat generation in the first charging stage.

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

[0031] Determining a first summation result of a preset value and a preset current change rate, and determining a second summation result of a preset value and an internal resistance change rate;

[0032] The heat generation ratio is determined 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 a first summation result of a preset value and a preset current change rate, and a second summation result of a preset value and an internal resistance change rate, and determines a heat generation ratio based on 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 efficiency of determining the heat generation ratio is improved.

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

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

[0036] The method provided in this embodiment determines a first summation result of a preset value and a preset current change rate, and a second summation result of a preset value and an internal resistance change rate, and determines a heat generation ratio based on 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 efficiency of determining the heat generation ratio is improved.

[0037] In one embodiment, determining a second internal resistance of the battery in a charging period next to the current charging period based on a charging time of the battery using a first charging current in a current charging period and a first internal resistance of the battery in the current charging period includes:

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

[0039] When the charging time is equal to the charging time threshold, obtaining a second voltage of the battery;

[0040] A second internal resistance of the battery is determined according to a voltage difference between the second voltage and the first voltage and the first charging current.

[0041] 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 the second internal resistance of the battery based on 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 thus 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 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 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.

[0044] 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's state of charge is lower than a preset state of charge and the battery temperature is lower than a preset temperature.

[0045] In one embodiment, the current charging period is the first charging period. When the battery has been idle for longer than a preset period, determining the second internal resistance of the battery in a charging period next to the current charging period based on 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 includes:

[0046] If the battery has been idle for longer than a preset time and the battery temperature is lower than a preset temperature, determining a second internal resistance of the battery in a charging period subsequent to the first charging period based on 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;

[0047] Among them, the initial charging current is 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 enters the first charging period. The charging performance test data is used to characterize the correspondence between the battery temperature, state of charge and charging current; the initial internal resistance is determined based on the internal resistance test data of the sample battery, the initial battery temperature and the initial state of charge.

[0048] The method provided in this embodiment determines the second internal resistance of the battery in the next charging period after the first charging period based on 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 when the current charging period is the first charging period. This can thereby determine the second internal resistance of the battery in the next charging period after the first charging period, provide a relatively reliable basis for subsequently determining the second charging current in the next charging period, and facilitate 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 determining module, configured to determine, when the shelf time of the battery is greater than a preset time, a second internal resistance of the battery in a charging period next to the current charging period based on a charging time of the battery using a first charging current in the current charging period and a first internal resistance of the battery in the current charging period;

[0051] a second determining module, configured to determine a second charging current for a next charging period based on the first internal resistance, the second internal resistance, and a heat control condition of the battery; the heat control condition including that a first heat generation of the battery when using the first charging current for the same duration is less than or equal to a second heat generation of the battery when using the second charging current;

[0052] The charging module is used to charge the battery according to the second charging current when the battery enters the next charging period.

[0053] In a third aspect, the present application further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any of the above methods when executing the computer program.

[0054] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0055] In a fifth aspect, the present application further provides a computer program product, which includes a computer program that implements the steps of any of the above methods when executed by a processor.

[0056] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

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

[0059] Figure 2 1 is a schematic diagram of the relationship between the charging current and the SOC of another battery before and after being left idle, provided by an embodiment of the present application;

[0060] Figure 3 This is a flow chart of a battery charging method provided in an embodiment of the present application;

[0061] Figure 4 is a flow chart of a second charging current determination method provided in an embodiment of the present application;

[0062] Figure 5 1 is a flow chart of a method for obtaining a target current change rate provided in an embodiment of the present application;

[0063] Figure 6 1 is a flow chart of a method for determining a heat production ratio provided in an embodiment of the present application;

[0064] Figure 7 is a flow chart of a second internal resistance determination method provided in an embodiment of the present application;

[0065] Figure 8 This is a schematic diagram of the overall process of a battery charging method provided in an embodiment of the present application;

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

[0067] Figure 10 1 is a schematic diagram comparing the current change rate in a conventional charging method provided in an embodiment of the present application with the current change rate provided in an embodiment of the present application;

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

[0069] Figure 12 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

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

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0072] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0073] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0074] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

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

[0076] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on 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 battery life and charging efficiency. However, the battery life and charging efficiency are affected by the battery charging method.

[0078] The current battery charging method is as follows: obtaining the initial battery temperature and initial state of charge (SOC) before charging the battery, determining the initial charging current at the initial battery temperature and initial SOC based on pre-acquired charging performance test data, the initial battery temperature, and the initial SOC, and starting charging the battery using the initial charging current. As charging time progresses, the battery temperature increases and the battery SOC also increases. The battery temperature and SOC during the battery charging process can be obtained, and based on the charging performance test data, the battery temperature and SOC during the battery charging process, the charging current at the battery temperature and SOC is obtained, and the battery is charged 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 battery storage, the negative electrode impedance increases due to side reactions, resulting in a decrease in battery charging current. Figure 1 As shown, Figure 1 This is a schematic diagram of the relationship between the charging current and SOC of a battery before and after being left idle, provided by an embodiment of the present application. For example, Figure 1 The middle curve is the relationship between the charging current and SOC of the battery at -20℃. Curve 11 is the curve of the battery before shelving, and curve 14 is the curve of the battery after shelving for 40 days. Curve 12 is the curve of another battery before shelving, and curve 13 is the curve of the battery after shelving for 40 days. Figure 1 As shown in the curve, it can be seen that when the SOC is in the range of 20% to 40%, the corresponding charging current is reduced by about 15% compared with that before the shutdown; Figure 2 As shown, Figure 2is a schematic diagram showing the relationship between the charging current and SOC of another battery before and after being left idle, provided in an embodiment of the present application. Figure 2 Figure 15 shows the relationship between the charging current and SOC of the battery at 25°C. Curve 15 is the curve of the battery before shelving, and curve 16 is the curve of the battery after 40 days of shelving. The other curves in the figure are curves of other battery tests. Based on curves 15 and 16, it can be seen that when the SOC is in the range of 20-80%, the corresponding charging current is reduced by about 6% compared with before shelving.

[0080] Based on the above Figure 1 and Figure 2 It can be seen that the battery's charging current is affected by the length of time it has been idle. If the battery is charged after being idle for a long time, the battery's charging current will be lower than the charging current before being idle at the same SOC. That is, the charging current the battery can accept after being idle for a long time will be lower than the charging current it can accept before being idle. However, current battery charging methods do not take the length of time the battery has been idle into account. Batteries that have been idle for a long time are still charged based on the charging current obtained from the charging performance test table, that is, they are still charged with a higher charging current. Although this can take into account charging efficiency, if the battery's ability to accept charging current is reduced, still charging the battery with the charging current before the capacity reduction will cause lithium deposition in the battery, shortening the battery's service life.

[0081] 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 solved urgently in this field.

[0082] In order to solve the above technical problems, the present invention provides a battery charging method. Figure 3 As shown, Figure 3 1 is a flow chart of a battery charging method provided in an embodiment of the present application. The method can be applied to a battery management system. The method includes the following steps:

[0083] S201, when the battery has been idle for longer than a preset time, determining a second internal resistance of the battery in a next charging period after the current charging period based on a charging time of the battery using a first charging current in the current charging period and a first internal resistance of the battery in the current charging period.

[0084] The shelving period refers to the length of time a battery is left unused in a certain location. The battery can be installed in a vehicle or vessel, or stored separately.

[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 of the battery when charging, 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 battery has been idle for longer than a preset time. If the idle time is longer than the preset time, the battery is charged using the initial charging current. For the sake of convenience in the subsequent description, the period during which the battery is charged using the initial charging current is referred to as the initial charging period. The current charging period in this step can be the initial charging period or any charging period after the initial charging period except the last charging period.

[0087] If the current charging period is an initial charging period, the first internal resistance is the initial internal resistance. If the current charging period is a charging period after the initial charging period, the first internal resistance is the internal resistance of the battery during that charging period. The initial charging period is the first charging period.

[0088] In one possible implementation, a first battery voltage can be obtained 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. When the charging time is equal to the charging time threshold, a second battery voltage can be obtained. The second internal resistance of the battery can be determined based on the voltage difference between the second voltage and the first voltage and the first charging current. The charging time threshold can be set to a value between 30 seconds and 3 minutes.

[0089] For example, if the charging time threshold is 1 minute and the preset difference is 10 seconds, in the initial charging stage of charging the battery using the initial charging current, the charging time of the battery using the initial charging current can be obtained, and the first voltage of the battery is obtained when the charging time is 50 seconds, that is, when the difference from the charging time threshold is 10 seconds, and the second voltage of the battery is obtained when the charging time 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 a preset coefficient is used as the second internal resistance. The next charging period is the charging period after the initial charging period. When the charging time 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 time of the battery when charged 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 may include charging time samples and internal resistance samples in a charging period in which a battery sample is charged with the first charging current sample, as well as the actual internal resistance of the battery sample in the charging period following the charging period.

[0091] S202, determining a second charging current for a next charging period based on the first internal resistance, the second internal resistance, and a heat control condition of the battery; the heat control condition including that a first heat generation of the battery when using the first charging current for the same duration is less than or equal to a 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 based on the first internal resistance and the second internal resistance; a heat generation ratio can be determined based on the internal resistance change rate and a preset current change rate; a target current change rate can be determined based on the heat generation ratio and a heat control condition; and a second charging current can be determined based on the target current change rate and the first charging current. The heat generation ratio represents the ratio of the heat generation of the battery, obtained based on the preset current change rate, to the first heat generation.

[0093] According to Joule's law, Q = Calculate the intermediate heat generation and the first heat generation. Q represents heat, I represents current, R represents internal resistance, and t represents charging time. Since the intermediate heat generation = ,in, 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. , , represents the internal resistance change rate. Therefore, the heat generation ratio of the battery obtained based on the preset current change rate to the first heat generation is = .in, The preset current change rate is Can be set to 0 or other values ​​very close to 0.

[0094] Afterwards, the target current change rate is determined based on the heat generation ratio and the heat control condition; the second charging current is determined based on the target current change rate and the first charging current. If the heat generation ratio is not less than the 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, and then the second charging current is determined based on 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 needs to be adjusted. The current change rate is obtained by adjusting the value of the current change rate until the heat generation ratio determined by the new current change rate satisfies the heat control condition, and the current change rate corresponding to the heat generation ratio that satisfies the heat control condition is used as the target current change rate, and then the second charging current is determined based on the target current change rate and the first charging current. 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 may be equal to 0 or less than 0. If it is less than or equal to 0, the determined target current change rate is greater than 0.

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

[0096] According to Joule's law, Q = Calculate the intermediate heat generation and the first heat generation. Q represents heat, I represents current, R represents internal resistance, and t represents charging time. For example, intermediate heat generation = ,in, Indicates the intermediate charging current, Represents the second internal resistance. The first heat generation = , represents the first charging current, Represents the first internal resistance. , 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 according to the second charging current.

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

[0100] The method provided in this embodiment determines, when the battery has been idle for longer than a preset time, the second internal resistance of the battery in the next charging period following the current charging period based on the duration of charging the battery using a first charging current in the current charging period and the first internal resistance of the battery in the current charging period. The method then determines a second charging current for the next charging period based on the first and second internal resistances and the battery's thermal control conditions. When the battery enters the next charging period, the battery is charged according to the second charging current. Because the second charging current determined based on the thermal control conditions ensures that the heat generated by the battery in the next charging period using the second charging current is no less than the heat generated in the current charging period, it is possible to achieve a balanced balance between the battery's temperature rise rate and, therefore, both charging efficiency and battery life.

[0101] In one embodiment, Figure 4 As shown, Figure 4 This is a flow chart of a method for determining a second charging current provided in an embodiment of the present application. This embodiment relates to a possible implementation method for determining the second charging current based on the first internal resistance, the second internal resistance, and the thermal control conditions of the battery. Based on the above embodiment, the method includes the following steps:

[0102] S301 , determining an internal resistance change rate according to a first internal resistance and a second internal resistance.

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

[0104] S302 , determining a heat generation ratio according to the internal resistance change rate and the 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.

[0105] According to Joule's law, Q = Calculate the heat production ratio, which can be equal to ,in, The preset current change rate is Can be set to 0 or a value very close to 0. Alternatively, The result obtained by multiplying the heat generation ratio by a preset coefficient is the heat generation ratio.

[0106] S303, determining a target current change rate based on the heat generation ratio and the heat control condition;

[0107] If the heat generation ratio satisfies the heat control condition, the preset current change rate is used as the target current change rate;

[0108] 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; the target current change rate is the current change rate at which the heat generation ratio obtained according to the target current change rate meets the heat control condition.

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

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

[0111] Determining the second charging current based on the target current change rate and the first charging current can be achieved in the following manner:

[0112] The product of the first charging current and the target current change rate is determined, and the sum of the product and the first charging current is used as the second charging current.

[0113] The method provided in this embodiment determines the internal resistance change rate based on the first internal resistance and the second internal resistance, determines the heat generation ratio based on 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 based on the target current change rate and the first charging current. By determining the heat generation ratio based on the internal resistance change rate, the heat generation ratio can be obtained without calculating the specific values ​​of the heat generation of the battery obtained based on the preset current change rate and the first heat generation, 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-mentioned S303, determining the target current change rate based on the heat generation ratio and the heat control condition, can be implemented as follows:

[0115] If the heat generation ratio satisfies the heat control condition, the preset current change rate is used as the target current change rate;

[0116] 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; the target current change rate is the current change rate at which the heat generation ratio obtained according to the target current change rate meets the heat control condition.

[0117] In the method provided in this embodiment, if the heat generation ratio satisfies 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 the target current change rate that meets the heat control condition, laying the foundation for determining the second charging current based on the target current change rate.

[0118] In one embodiment, Figure 5 As shown, Figure 5 This is a flow chart of a method for obtaining a target current change rate provided by an embodiment of the present application. This embodiment involves a possible implementation method of how to adjust a 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 range.

[0120] The preset adjustment range is, for example, 0.5%. The sum of 0.5% and 1% is taken as the new current change rate after the current adjustment. If If it is equal to 0, then the new current change rate after the current adjustment is 0.5%.

[0121] S402 , determining 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 examples, the new heat production ratio can be equal to .

[0123] S403, if the new heat production ratio does not meet the heat control condition, return to the step of adjusting the new current change rate according to the preset adjustment range until the new heat production 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] like If the heat control conditions are not met, continue to adjust the temperature according to the preset range. Adjustment is made. The new current change rate after this adjustment is 1%. The new heat generation ratio after this adjustment can be obtained. Then the new heat generation ratio after this adjustment can be equal to ,like If the heat control conditions are met, 1% is used 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 previous adjustment, and if the new heat generation ratio does not meet the heat control condition, returns to the step of adjusting the new current change rate according to the preset adjustment range until the new heat generation ratio obtained after the most recent adjustment meets the heat control condition, and uses the new current change rate obtained after the most recent adjustment as the target current change rate, thereby determining the target current change rate, laying the 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 satisfies the heat control condition, the new current change rate obtained after the current adjustment is used as the target current change rate.

[0128] Combining the above example, if If the heat control conditions are met, as the target current change rate.

[0129] The method provided in this embodiment determines 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 production ratio meets the heat control condition, thereby laying the 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 production ratio is greater than or equal to the preset ratio, it is determined that the heat production ratio meets the heat control condition.

[0132] For example, if the preset ratio is 1, then 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 determines that the heat generation ratio satisfies the heat control condition if the heat generation ratio is greater than or equal to a preset ratio. This enables the target current change rate determined based on the heat generation ratio and the heat control condition to satisfy the heat control condition, and further enables the determined second charging current to satisfy the heat control condition. That is, the heat generation in the second charging stage of charging the battery using the second charging current is not less than the heat generation in the first charging stage.

[0134] In one embodiment, Figure 6 As shown, Figure 6This is a flow chart of a method for determining a heat generation ratio provided in an embodiment of the present application. This embodiment relates to a possible implementation method for determining the ratio of intermediate heat generation to first heat generation when charging a battery using an intermediate charging current based on the internal resistance change rate. Based on the above embodiment, the above S302 includes the following steps:

[0135] S501, determining a first summation result of a preset value and a preset current change rate, and determining a second summation result of a preset value and an internal resistance change rate.

[0136] S502: Determine a heat production ratio according to the product of the square of the first summation result and the second summation result.

[0137] The default value is 1, for example, The heat production ratio can be determined by multiplying the product of . The product can be used as the heat production ratio, or the result obtained by multiplying the product by a preset coefficient can be used as the heat production ratio.

[0138] The method provided in this embodiment determines a first summation result of a preset value and a preset current change rate, and a second summation result of a preset value and an internal resistance change rate, and determines a heat generation ratio based on 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 efficiency of determining the heat generation ratio is improved.

[0139] In one embodiment, the above-mentioned S502, determining the heat generation ratio according to the square of the first summation result and the product of the second summation result, can be implemented as follows:

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

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

[0142] In one embodiment, Figure 7 As shown, Figure 7 This is a flow chart of a method for determining a second internal resistance provided in an embodiment of the present application. This embodiment relates to a possible implementation method for determining a second internal resistance of a battery in a charging period subsequent to the current charging period based on the duration of charging the battery using a first charging current in the current charging period and the first internal resistance of the battery in the current charging period. Based on the above embodiment, the above S202 includes the following steps:

[0143] S601 : 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, obtain a first voltage of the battery.

[0144] S602: When the charging time is equal to the charging time threshold, obtain a second voltage of the battery.

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

[0146] For example, if the charging time threshold is 1 minute and the preset difference is 10 seconds, during the initial charging phase when the battery is charged using the initial charging current, the charging time using the initial charging current can be obtained. A first battery voltage can be obtained when the charging time is 50 seconds (i.e., the difference from the charging time threshold is 10 seconds). A second battery voltage can be obtained when the charging time is 60 seconds. The quotient obtained by dividing the voltage difference between the second and first voltages by the initial charging current is used as the second internal resistance of the battery in the next charging period. Alternatively, the quotient obtained by multiplying the quotient by a preset coefficient is used as the second internal resistance. The next charging period is the charging period following the initial charging period. If the charging time threshold is 1 minute, the next charging period refers to the charging period between 60 and 120 seconds. For ease of explanation, the charging period between 60 and 120 seconds is referred to as charging period A. A second charging current for charging period A can then be determined based on the initial internal resistance, the second internal resistance during charging period A, and the heat control conditions. The second charging current during charging period A is referred to as charging current A.

[0147] As the battery charging time progresses, if the battery enters charging period A, charging period A becomes the current charging period, and charging current A becomes the first charging current. The second internal resistance of the battery in the charging period following charging period A can be determined based on the duration of charging with charging current A during charging period A and the first internal resistance of the battery during charging period A. If the charging period following charging period A is referred to as charging period B, then charging period B is a charging period between 120 seconds and 180 seconds.

[0148] Then, the second charging current in charging period B may be determined according to the first internal resistance in 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 becomes the current charging period, and the second charging current of charging period B becomes the first charging current of the current charging period. Similar to the method for determining the second internal resistance of the battery in the charging period following charging period A described above when the battery enters charging period A, the second internal resistance of the battery in the charging period following 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 the second internal resistance of the battery based on 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 thus 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 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's state of charge is lower than a preset state of charge and the battery temperature is lower than a preset temperature.

[0154] In one embodiment, if the current charging period is the first charging period, the above-mentioned S201, when the battery has been idle for longer than a preset period, determines the second internal resistance of the battery in the next charging period after the current charging period based on 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, can be implemented as follows:

[0155] If the battery has been idle for longer than a preset time and the battery temperature is lower than a preset temperature, determining a second internal resistance of the battery in a charging period subsequent to the first charging period based on 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 based on 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. The charging performance test data is used to characterize the correspondence between the battery temperature, state of charge and charging current; the initial internal resistance is determined based on 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. The first row in Table 1 represents the SOC ratio. 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. For example, when the initial state of charge is in the range of 0 to 5% and the battery temperature is -20°C, charging current A1 can be used as the initial charging current. As another example, when the initial state of charge is in the range of 5% to 10% and the battery temperature is -15°C, charging current B1 or 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, where the first row represents the SOC ratio and the first column represents the battery temperature. Similar to the above-mentioned determination of the initial charging current, the initial internal resistance can be determined based on the internal resistance test data.

[0161] Table 2

[0162]

[0163] If the battery is left idle for longer than the preset time, the battery temperature may be low. Figure 1 As shown in the analysis, when the battery is stored at a low temperature, such as -20°C, relative to the battery stored at 25°C for the same length of time, 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, using the method of this embodiment at low temperatures can better improve the service life of the battery compared to using the method provided by this embodiment at other temperatures.

[0164] The method provided in this embodiment determines the second internal resistance of the battery in the next charging period after the first charging period based on 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 when the current charging period is the first charging period. This can thereby determine the second internal resistance of the battery in the next charging period after the first charging period, provide a relatively reliable basis for subsequently determining the second charging current in the next charging period, and facilitate more accurate determination of the second charging current.

[0165] In one embodiment, Figure 8 As shown, Figure 8 1 is a schematic diagram of the overall flow of a battery charging method provided in an embodiment of the present application, the method comprising the following steps:

[0166] S701, determining an initial charging current of the battery based on charging performance test data, an initial battery temperature and an initial state of charge of the battery during charging, and determining an initial internal resistance of the battery based on internal resistance test data, an initial battery temperature and an initial state of charge.

[0167] S702: Determine whether the hold time is greater than a preset time.

[0168] If the hold time is longer than the preset time, execute S703; if the hold time is not longer than the preset time, execute S704.

[0169] S703: Determine whether the battery temperature of the battery is lower than a preset temperature.

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

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

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

[0173] S705 , charging the battery using an initial charging current.

[0174] S706 , determining a second internal resistance of the battery in a next charging period according to a charging time duration of charging the battery with the first charging current and a first internal resistance of the battery in a current charging period when the battery is charged with the first charging current.

[0175] S707 , determining an 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 a preset current change rate.

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

[0179] S709 , determining, based on the internal resistance change rate, whether a heat generation ratio of the intermediate heat generated when the battery is charged with the intermediate charging current to the first heat generated is greater than a preset ratio.

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

[0181] S710: Adjust the preset current change rate to obtain a target current change rate.

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

[0183] S712: The second charging current is used as the charging current for the next charging period.

[0184] S713: Determine whether the battery SOC is greater than or equal to a preset SOC.

[0185] If the SOC is greater than or equal to the preset SOC, the charging process ends; if the SOC of the battery is less than the preset SOC, the process returns to S703.

[0186] Reference Figure 9 and Figure 10 , Figure 9 This is a simulation diagram of the relationship between battery temperature and SOC during battery charging provided by an embodiment of the present application. Figure 10 : is a schematic diagram comparing the current change rate in a conventional charging method provided in an embodiment of the present application with the current change rate provided in an embodiment of the present application. Figure 9 The horizontal axis represents SOC, and the vertical axis represents battery temperature, in degrees Celsius; Figure 10 The horizontal axis is the battery temperature, and the vertical axis is the rate of change of the charging current. Figure 9 It can be seen that when the battery temperature is less than 0 degrees 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 battery temperature has a greater impact on the charging current. Figure 10 Shows the relationship between battery temperature and the rate of change of charge current. Figure 10 The middle curve 91 represents the corresponding relationship between the current change rate and the battery temperature in the traditional charging method, and the curve 92 represents the corresponding relationship between the target current change rate and the battery temperature in the charging method of the embodiment of the present application. For example, the preset temperature is 0 degrees Celsius, and the battery temperature is 0 degrees Celsius. Figure 10 It can be seen that when the temperature is less than 0 degrees Celsius, the charging current in the embodiment of the present application is less than the charging current in the traditional charging method at the same temperature, and the heat generated by the battery in the second charging current used in the next charging period is not less than the heat generated in the current charging period. Therefore, it is possible to achieve a balance between the temperature rise rate of the battery, thereby achieving a balance between charging efficiency and battery life. Figure 10 The current change rate is based on the heat generation ratio =1, and the internal resistance change rate calculated according to the embodiment of the present application is Determined results.

[0187] It should be understood that, although the steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily to be performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0188] Based on the same inventive concept, embodiments of the present application further provide a battery charging device for implementing the aforementioned battery charging method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more battery charging device embodiments provided below can be found in the aforementioned limitations of the battery charging method and will not be further elaborated here.

[0189] In one embodiment, Figure 11 As shown, Figure 11 1 is a schematic structural diagram of a battery charging device provided in an embodiment of the present application. The device 1000 includes:

[0190] A first determining module 1001 is configured to determine, when the battery has been idle for longer than a preset time, a second internal resistance of the battery in a subsequent charging period after the current charging period based on a charging time of the battery using a first charging current in the current charging period and a first internal resistance of the battery in the current charging period;

[0191] a second determining module 1002, configured to determine a second charging current for a next charging period based on the first internal resistance, the second internal resistance, and a heat control condition of the battery; the heat control condition including that a first heat generation of the battery when using the first charging current for the same duration is less than or equal to a second heat generation of the battery when using the second charging current;

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

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

[0194] a first determining unit, configured to determine an internal resistance change rate according to the first internal resistance and the second internal resistance;

[0195] a second determining unit, configured to determine a heat generation ratio according to the internal resistance change rate and the preset current change rate; the heat generation ratio being used to represent a ratio of the heat generation of the battery obtained based on the preset current change rate to the first heat generation;

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

[0197] The fourth determining unit is configured to determine the second charging current according to the target current change rate and the first charging current.

[0198] In one embodiment, the third determining unit is specifically configured to use a preset current change rate as a target current change rate if the heat generation ratio satisfies the heat control condition;

[0199] 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; the target current change rate is the current change rate at which the heat generation ratio obtained according to the target current change rate meets the heat control condition.

[0200] In one embodiment, the third determination unit is specifically used to adjust the preset current change rate according to the preset adjustment amplitude; determine the 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 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 determining unit is further configured to use the new current change rate obtained after the current adjustment as the target current change rate if the new heat generation ratio satisfies the heat control condition.

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

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

[0204] In one embodiment, the second determining 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 used to obtain 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; obtain a second voltage of the battery when the charging time is equal to the charging time threshold; and determine a second internal resistance of the battery based on the voltage difference between the second voltage and the first voltage and the first charging current.

[0206] In one embodiment, the third determining module 1003 is specifically configured to charge the battery according to the second charging current 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.

[0207] In one embodiment, the current charging period is the first charging period, and the first determining module 1001 is specifically configured to, when the battery has been idle for longer than a preset period and the battery temperature is lower than a preset temperature, determine a second internal resistance of the battery in a charging period subsequent to the first charging period based on 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;

[0208] Among them, the initial charging current is 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 enters the first charging period. The charging performance test data is used to characterize the correspondence between the battery temperature, state of charge and charging current; the initial internal resistance is determined based on the internal resistance test data of the sample battery, the initial battery temperature and the initial state of charge.

[0209] Each module in the battery charging device described above may be implemented in whole or in part through software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor in a computer device in hardware form, or may be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0210] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 12 As shown. The computer device includes a processor, a memory, and a network interface connected via a system bus. 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 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 via a network connection. When the computer program is executed by the processor, it implements a battery charging method.

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

[0212] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the steps of any of the above-mentioned method embodiments are implemented. The technical principles and technical effects are similar and will not be repeated 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-mentioned method embodiments are implemented. The technical principles and technical effects are similar and will not be repeated 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 principles and technical effects are similar and will not be repeated 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 used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0216] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the 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 above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. 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), magnetic 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 take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0217] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, 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, they should be considered to be within the scope of 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery charging method, characterized in that: The method comprises: When the battery has been idle for longer than a preset time, determining a second internal resistance of the battery in a charging period subsequent to the current charging period based on a charging time of the battery using a first charging current in a current charging period and a first internal resistance of the battery in the current charging period; determining a second charging current for the next charging period based on the first internal resistance, the second internal resistance, and a heat control condition of the battery; the heat control condition including that a first heat generation of the battery when using the first charging current is less than or equal to a second heat generation of the battery when using the second charging current for the same duration; When the battery enters the next charging period, charging the battery according to the second charging current; 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 the 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; The determining of 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; The heat generation ratio is determined according to the product of the square of the first summation result and the second summation result.

2. The method according to claim 1, characterized in that The determining the target current change rate based on the heat generation ratio and the heat control condition includes: If the heat generation ratio satisfies the heat control condition, the preset current change rate is used as the target current change rate; If the heat production ratio does not meet the heat control condition, the preset current change rate is adjusted to obtain the target current change rate; the target current change rate is the current change rate at which the heat production ratio obtained according to the target current change rate meets the heat control condition.

3. The method according to claim 2, 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 range; 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 production ratio does not meet the heat control condition, the process returns to the step of adjusting the new current change rate according to the preset adjustment amplitude until the new heat production ratio obtained after the most recent adjustment meets the heat control condition, and the new current change rate obtained after the most recent adjustment is used as the target current change rate.

4. The method according to claim 3, characterized in that The method further comprises: If the new heat generation ratio satisfies the heat control condition, the new current change rate obtained after the current adjustment is used as the target current change rate.

5. The method according to any one of claims 2 to 4, characterized in that: The method further comprises: If the heat production ratio is greater than or equal to the preset ratio, it is determined that the heat production ratio meets the heat control condition.

6. The method according to claim 1, characterized in that The determining the heat production ratio according to the product of the square of the first summation result and the second summation result includes: The product of the square of the first summation result and the second summation result is used as the heat generation ratio.

7. The method according to any one of claims 1 to 4, characterized in that The method of determining a second internal resistance of the battery in a charging period next to the current charging period according to a charging time duration of the battery using a first charging current in a current charging period and a first internal resistance of the battery in the current charging period includes: When the charging time is less than a charging time threshold and a difference between the charging time and the charging time threshold is equal to a preset difference, obtaining a first voltage of the battery; When the charging time is equal to the charging time threshold, obtaining a second voltage of the battery; A second internal resistance of the battery is determined according to a voltage difference between the second voltage and the first voltage and the first charging current.

8. The method according to any one of claims 1 to 4, characterized in that 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 of the battery is less than a preset temperature, the battery is charged according to the second charging current.

9. The method according to any one of claims 1 to 4, characterized in that The current charging period is the first charging period. When the battery is idle for longer than a preset period, determining the second internal resistance of the battery in a charging period following the current charging period based on the charging time of the battery using a first charging current in the current charging period and the first internal resistance of the battery in the current charging period includes: If the battery has been idle for longer than a preset time, and the battery temperature of the battery is lower than a preset temperature, determining a second internal resistance of the battery in a charging period subsequent to the first charging period based on a charging time of the battery using an initial charging current in the first charging period and an initial internal resistance of the battery in the first charging period; The initial charging current is 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 enters the first charging period, and the charging performance test data is used to characterize the correspondence between the battery temperature, the state of charge and the charging current; the initial internal resistance is determined based on the internal resistance test data of the sample battery, the initial battery temperature and the initial state of charge.

10. A battery charging device, characterized in that: The device comprises: a first determining module, configured to determine, when the shelf time of the battery is greater than a preset time, a second internal resistance of the battery in a charging period next to the current charging period based on a charging time of the battery using a first charging current in a current charging period and a first internal resistance of the battery in the current charging period; a second determining module, configured to determine a second charging current for the next charging period based on the first internal resistance, the second internal resistance, and a heat control condition of the battery; the heat control condition including that a first heat generation of the battery when using the first charging current is less than or equal to a second heat generation of the battery when using the second charging current for the same duration; a charging module, configured to charge the battery according to the second charging current when the battery enters the next charging period; 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 the 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; The determining of 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; The heat generation ratio is determined according to the product of the square of the first summation result and the second summation result.

11. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

12. 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 9 are implemented.

13. 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 9 are implemented.

Images