Power battery low-temperature fast charging current correction method, electronic device, and storage medium

Abstract

This invention discloses a method, electronic device, and storage medium for correcting the low-temperature fast charging current of a power battery. The method includes: acquiring temperature data at preset temperature monitoring points; fitting a temperature correction coefficient based on the temperature data; correcting the internal core temperature in the temperature data according to the temperature correction coefficient to obtain an internal core temperature correction value; and correcting the low-temperature fast charging current of the power battery based on the internal core temperature correction value. The technical solution provided by this invention, by calculating the internal core temperature correction value, uses the internal core temperature correction value to perform fast charging MAP readings when auxiliary heating is activated during low-temperature fast charging, thereby correcting the fast charging current. This solves the lithium plating risk problem caused by low internal battery temperature and excessive current in low-temperature heating scenarios, effectively improving battery safety performance.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a method for correcting the current during low-temperature fast charging of a power battery, an electronic device, and a storage medium. Background Technology

[0002] When an electric vehicle is fast-charging at a charging station, the Battery Management System (BMS) compares the requested current value with the allowed current value in the fast-charging MAP (Charge-Up Map), selecting the smaller value to execute. The fast-charging MAP specifies the maximum allowable current for the battery cell at different temperatures and states of charge (SOC). If the executed current is too high, it may cause lithium plating. At low temperatures, vehicles typically activate auxiliary heating devices, causing the internal core temperature to be lower than the surface temperature of the casing. When fast charging with current meter readings at low temperatures, since the internal core temperature cannot be monitored, the surface temperature is used directly for meter readings, resulting in excessive current and a risk of lithium plating. Summary of the Invention

[0003] This invention provides a method for correcting the current of a power battery during low-temperature fast charging, an electronic device, and a storage medium to address the risk of lithium plating caused by low internal temperature and excessive current in power batteries under low-temperature heating scenarios.

[0004] According to one aspect of the present invention, a method for correcting the current during fast charging of a power battery at low temperatures is provided, comprising:

[0005] Acquire temperature data from preset temperature monitoring points;

[0006] A temperature correction factor is fitted based on the temperature data;

[0007] The internal core temperature in the temperature data is corrected according to the temperature correction coefficient to obtain the internal core temperature correction value;

[0008] The low-temperature fast charging current of the power battery is adjusted based on the internal core temperature correction value.

[0009] Optionally, the temperature data includes the surface temperature of the cell casing, the internal core temperature, and the external ambient temperature;

[0010] Obtaining temperature data from preset temperature monitoring points includes:

[0011] A thermal discharge test was conducted on the power battery to obtain the surface temperature of the cell casing, the internal core temperature, and the external ambient temperature at preset temperature monitoring points.

[0012] Optionally, the hot battery rate discharge test specifically includes:

[0013] After being fully charged at 0.33C at 25℃, it is discharged at 3C constant current until the preset lower limit voltage value is reached.

[0014] Optionally, fitting a temperature correction coefficient based on the temperature data includes:

[0015] Using the surface temperature of the battery cell casing as the x-axis and the internal core temperature as the y-axis, a straight line is fitted and the slope of the straight line is obtained.

[0016] The temperature correction factor is determined based on the slope.

[0017] Optionally, determining the temperature correction factor based on the slope includes:

[0018] The temperature correction factor is determined using the following formula:

[0019] In the formula, The slope This is the temperature correction factor.

[0020] Optionally, correcting the internal core temperature in the temperature data according to the temperature correction coefficient to obtain the internal core temperature correction value includes:

[0021] Calculate the temperature difference between the surface temperature of the battery cell casing and the external ambient temperature;

[0022] The sum obtained by multiplying the difference by the temperature correction coefficient and then adding it to the cell surface temperature is determined as the internal core temperature correction value.

[0023] Optionally, the internal core temperature correction value should satisfy the following relationship:

[0024] In the formula, This is the internal core temperature correction value. This is a temperature correction factor. The surface temperature of the battery cell casing. The external ambient temperature.

[0025] Optionally, adjusting the low-temperature fast charging current of the power battery based on the internal core temperature correction value includes:

[0026] The corresponding current in the fast charging MAP is read using the internal core temperature correction value, and the current is used as the low-temperature fast charging current of the power battery.

[0027] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0028] At least one processor; and

[0029] A memory communicatively connected to the at least one processor; wherein,

[0030] The memory stores a computer program that can be executed by the at least one processor, which is then executed by the at least one processor to enable the at least one processor to perform the power battery low-temperature fast charging current correction method according to any embodiment of the present invention.

[0031] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions, the computer instructions being configured to cause a processor to execute and implement the power battery low-temperature fast charging current correction method according to any embodiment of the present invention.

[0032] This invention provides a method, electronic device, and storage medium for correcting the low-temperature fast charging current of a power battery. The method includes: acquiring temperature data at preset temperature monitoring points; fitting a temperature correction coefficient based on the temperature data; correcting the internal core temperature in the temperature data according to the temperature correction coefficient to obtain an internal core temperature correction value; and correcting the low-temperature fast charging current of the power battery based on the internal core temperature correction value. The technical solution provided by this invention, by calculating the internal core temperature correction value, uses the internal core temperature correction value to perform fast charging MAP readings when auxiliary heating is activated during low-temperature fast charging, thereby correcting the fast charging current. This solves the lithium plating risk problem caused by low internal battery temperature and excessive current in low-temperature heating scenarios, effectively improving battery safety performance.

[0033] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A flowchart of a method for correcting the current of a power battery during low-temperature fast charging, provided as an embodiment of the present invention;

[0036] Figure 2 A flowchart of another method for correcting the current of a power battery at low temperatures during fast charging, provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of battery monitoring points provided in an embodiment of the present invention;

[0038] Figure 4 The test line graph provided in the embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of an electronic device for a low-temperature fast charging current correction method for power batteries, provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Figure 1 This is a flowchart illustrating a low-temperature fast-charging current correction method for a power battery, provided by an embodiment of the present invention. This embodiment is applicable to situations where the current is excessively high during fast charging of a battery at low temperatures using a current meter. This method can be executed by a low-temperature fast-charging current correction device for a power battery. This device can be implemented in hardware and / or software and can be configured in any electronic device with communication capabilities. See also... Figure 1 The method includes:

[0043] S110. Obtain temperature data from preset temperature monitoring points.

[0044] Among them, the preset temperature monitoring points can be pre-set according to the monitoring needs. The temperature monitoring points include the middle position of the No. 1 cell shell surface closest to the water inlet, the internal core, and the external environment. Obtaining the temperature data of the preset temperature monitoring points means obtaining the surface temperature of the cell shell, the internal core temperature, and the external environment temperature. The temperature data of the preset temperature monitoring points can be obtained through temperature sensors.

[0045] S120. Fit a temperature correction coefficient based on the temperature data.

[0046] Specifically, based on temperature data, linear and / or nonlinear models are used to fit straight lines and / or curves to determine the slope, thereby determining the temperature correction coefficient. For example, a scatter plot is used to visualize the data, plotting the cell casing surface temperature at different times as the x-axis and the internal core temperature as the y-axis. If the points approximately form a straight line, a linear model is selected; if the points form a curve, a nonlinear model is selected, thus obtaining the slope of the straight line and / or curve.

[0047] The overfitting tool calculates and determines the temperature correction factor. The temperature correction factor should satisfy the following relationship:

[0048] In the formula, The slope This is the temperature correction factor.

[0049] S130. Correct the internal core temperature in the temperature data according to the temperature correction coefficient to obtain the internal core temperature correction value.

[0050] Specifically, the internal core temperature is substituted into the formula including the temperature correction coefficient to calculate the internal core temperature correction value. The internal core temperature correction value should satisfy the following formula:

[0051] In the formula, This is the internal core temperature correction value. This is a temperature correction factor. The surface temperature of the battery cell casing. The external ambient temperature.

[0052] S140: Correct the low-temperature fast charging current of the power battery based on the internal core temperature correction value.

[0053] Specifically, when reading the fast charging MAP meter during low-temperature fast charging, the current corresponding to the internal core temperature correction value is read for fast charging, so as to correct the low-temperature fast charging current of the power battery.

[0054] This invention provides a method, electronic device, and storage medium for correcting the low-temperature fast charging current of a power battery. The method includes: acquiring temperature data at preset temperature monitoring points; fitting a temperature correction coefficient based on the temperature data; correcting the internal core temperature in the temperature data according to the temperature correction coefficient to obtain an internal core temperature correction value; and correcting the low-temperature fast charging current of the power battery based on the internal core temperature correction value. The technical solution provided by this invention, by calculating the internal core temperature correction value, uses the internal core temperature correction value to perform fast charging MAP readings when auxiliary heating is activated during low-temperature fast charging, thereby correcting the fast charging current. This solves the lithium plating risk problem caused by low internal battery temperature and excessive current in low-temperature heating scenarios, effectively improving battery safety performance.

[0055] Figure 2 This is a flowchart of another method for correcting the current of a power battery at low temperatures during fast charging, provided by an embodiment of the present invention. This embodiment further refines the aforementioned embodiments. Optionally, the temperature data includes the surface temperature of the cell casing, the internal winding temperature, and the external ambient temperature; see [link to relevant documentation]. Figure 2 The method includes:

[0056] S210. Perform a thermal battery rate discharge test on the power battery to obtain the surface temperature of the cell casing, the internal core temperature, and the external ambient temperature at preset temperature monitoring points.

[0057] The hot battery rate discharge test specifically involves charging the battery at 25°C with a full charge of 0.33C, followed by a 3C constant current discharge until a preset lower voltage limit is reached. For example, the preset lower voltage limit is 2.5V. Since the voltage range of ternary lithium batteries is typically 2.5-4.2V or 2.8-4.25V, any one of these preset lower voltage limits can be selected.

[0058] Specifically, to correct the internal winding temperature by measuring the surface temperature of the battery cell casing, thereby correcting the current, a temperature sensor (thermocouple) is implanted inside the battery winding during manufacturing, since ordinary batteries cannot detect the internal winding temperature. This specially designed battery is called a thermal battery, which then obtains the internal winding temperature. After a full charge at 25°C and 0.33C, a 3C constant current discharge is performed until a preset lower voltage limit is reached. The surface temperature of the battery cell casing (T1), the internal winding temperature (T2), and the ambient temperature (T3) are recorded. See details... Figure 3 , Figure 3 This is a schematic diagram of battery monitoring points provided in an embodiment of the present invention.

[0059] S220. Fit a straight line with the surface temperature of the battery cell casing as the x-axis and the internal core temperature as the y-axis and obtain the slope of the straight line; determine the temperature correction coefficient based on the slope.

[0060] Specifically, with the surface temperature of the battery cell casing as the x-axis and the internal core temperature as the y-axis, a straight line is fitted to obtain the slope K of the line. Based on Fourier's law, the heat conduction formula is as follows:

[0061] In the formula, Q is the heat; ΔT is the temperature difference; R is the thermal resistance; L is the thickness; λ is the thermal conductivity; and S is the contact area.

[0062] For example, taking a cylindrical battery as an example, the heat transfer between the internal core and the surface of the casing has...

[0063] In the formula, This refers to the heat conducted between the internal winding core of the battery and the surface of the battery casing. This refers to the temperature difference between the internal winding temperature of the battery and the surface temperature of the cell casing. This refers to the thermal resistance between the internal winding core of the battery and the surface of the battery casing.

[0064] For cylindrical batteries (multi-layer wound), the thermal resistance between the internal winding core and the surface of the battery casing is... The relationship between series thermal resistances is derived from Fourier's law, i.e.:

[0065] In the formula, Battery radius; The radius of the coil needle; The thermal conductivity of the battery. This refers to the battery height.

[0066] The cooling plate efficiently and evenly dissipates the heat generated by the battery, maintaining it within its optimal operating temperature range. Its functions are as follows: ① Efficient heat dissipation in high-temperature environments to prevent thermal runaway; ② Auxiliary heating in low-temperature environments to quickly bring the battery to a suitable operating temperature; ③ Ensuring temperature uniformity among the cells within the battery pack.

[0067] Cooling plate placement: Different placement arrangements exist depending on different heat dissipation requirements. Common arrangements include placement at the bottom of the battery, side placement, and placement interspersed with the battery. The diagram illustrates a simplified form of side placement. Figure 3 As shown, the cooling plate is attached tightly to the side of the battery, and the battery's heat is dissipated through the cooling plate. (Depending on the heat dissipation requirements, cooling plates can be divided into double-sided / single-sided cooling; for ease of understanding and simplification, single-sided cooling is used here for demonstration.)

[0068] It should be noted that the arrangement of the cooling system in the battery thermal management system is relatively complex, but regardless of the arrangement, all heat dissipation follows Newton's law of cooling and Fourier's law.

[0069] Therefore, the heat conduction from the battery casing surface to the cooling plate and the convective transfer between the casing surface and the environment are as follows:

[0070] In the formula, This refers to the heat conducted between the battery casing surface and the cooling plate and the external environment. This refers to the temperature difference between the surface of the battery cell casing and the external environment. Thermal resistance between the cell casing surface and the cooling plate and the thermal resistance between the shell surface and the external environment sum.

[0071] right The internal resistance of the flat wall can be obtained from Fourier's law, that is:

[0072] In the formula, For the thickness of the cooling plate, The thermal conductivity of the cooling plate is... This represents the contact area between the battery casing and the cooling plate.

[0073] right According to Newton's law of cooling, we can obtain the following:

[0074] In the formula, The ambient convective heat transfer coefficient, This refers to the area of ​​the cooling plate for convective heat exchange with the environment.

[0075] When heat transfer reaches a steady state, i.e., thermal equilibrium, Qinternal = Qexternal, then we have

[0076] ;

[0077] That is to say

[0078] ;

[0079] Since the battery material structure remains unchanged, Rinner remains unchanged; since the heat dissipation structure, cooling plate material, and heat exchange area remain unchanged, Router also remains unchanged; therefore, the ratio X of Rinner to Router is a constant, which can be obtained by transforming the above formula:

[0080]

[0081] Therefore, with the cell surface temperature T1 as the x-axis and the internal core temperature T2 as the y-axis, the slope k is equal to 1+X, and the temperature correction coefficient X=K-1 can be obtained.

[0082] For example, Figure 4 The test line graph provided for the embodiments of the present invention, such as Figure 4As shown, the slope K of the test line is 3.515, so the temperature correction factor X = 3.515 - 1 = 2.515.

[0083] S230. Calculate the difference between the surface temperature of the battery cell casing and the external ambient temperature; multiply the difference by the temperature correction factor and add the result to the surface temperature of the battery cell, and determine the internal core temperature correction value.

[0084] S240: Use the internal core temperature correction value to read the corresponding current in the fast charging MAP and use the current as the low-temperature fast charging current of the power battery.

[0085] The technical solution provided by this invention corrects the internal core temperature by adjusting the surface temperature of the battery cell casing, thereby correcting the current and solving the risk of lithium plating caused by excessive current when the internal temperature of the power battery is low during low-temperature fast charging. At the same time, the technical solution provided by this invention can perform internal temperature calculation under any operating condition, and only one test is needed to obtain the temperature correction coefficient. Moreover, the correction coefficient does not need to be changed when the battery heat dissipation level remains unchanged.

[0086] Figure 5 This is a schematic diagram of an electronic device for a low-temperature fast charging current correction method for power batteries, provided as an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0087] like Figure 5 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0088] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0089] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as a method for correcting the current of a power battery during low-temperature fast charging.

[0090] In some embodiments, the low-temperature fast-charging current correction method for a power battery can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the low-temperature fast-charging current correction method for a power battery described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the low-temperature fast-charging current correction method for a power battery by any other suitable means (e.g., by means of firmware).

[0091] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0092] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0093] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0094] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0095] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0096] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0097] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0098] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for correcting the current during fast charging of a power battery at low temperatures, characterized in that, include: Acquire temperature data from preset temperature monitoring points; A temperature correction factor is fitted based on the temperature data; The internal core temperature in the temperature data is corrected according to the temperature correction coefficient to obtain the internal core temperature correction value; The low-temperature fast charging current of the power battery is adjusted according to the internal core temperature correction value; The temperature data includes the surface temperature of the cell casing, the internal winding temperature, and the external ambient temperature. Obtaining temperature data from preset temperature monitoring points includes: A thermal discharge test was conducted on the power battery to obtain the surface temperature of the cell casing, the internal core temperature, and the external ambient temperature at preset temperature monitoring points. The temperature correction coefficient fitted based on the temperature data includes: Using the surface temperature of the battery cell casing as the x-axis and the internal core temperature as the y-axis, a straight line is fitted and the slope of the straight line is obtained. The temperature correction factor is determined based on the slope. Determining the temperature correction factor based on the slope includes: The temperature correction factor is determined using the following formula: In the formula, The slope This is the temperature correction factor.

2. The method according to claim 1, characterized in that, The specific details of the thermal battery rate discharge test are as follows: After being fully charged at 0.33C at 25℃, it is discharged at 3C constant current until the preset lower limit voltage value is reached.

3. The method according to claim 1, characterized in that, The internal core temperature in the temperature data is corrected according to the temperature correction coefficient to obtain the internal core temperature correction value, including: Calculate the temperature difference between the surface temperature of the battery cell casing and the external ambient temperature; The sum obtained by multiplying the difference by the temperature correction coefficient and then adding it to the cell surface temperature is determined as the internal core temperature correction value.

4. The method according to claim 3, characterized in that, The internal core temperature correction value should satisfy the following relationship: In the formula, This is the internal core temperature correction value. This is the temperature correction factor. The surface temperature of the battery cell casing. The external ambient temperature.

5. The method according to claim 1, characterized in that, Correcting the low-temperature fast charging current of the power battery based on the internal core temperature correction value includes: The corresponding current in the fast charging MAP is read using the internal core temperature correction value, and the current is used as the low-temperature fast charging current of the power battery.

6. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the power battery low-temperature fast charging current correction method according to any one of claims 1-5.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that are used to cause a processor to execute the power battery low-temperature fast charging current correction method according to any one of claims 1-5.

Images