CN-122026577-A - Current map determining method and device, storage medium and electronic device

CN122026577ACN 122026577 ACN122026577 ACN 122026577ACN-122026577-A

Abstract

The application discloses a method and a device for determining a current map, a storage medium and an electronic device, wherein the method comprises the steps of calculating charging time corresponding to each charging interval of a target battery, and determining the total charging time of the target battery according to a plurality of charging times; and determining an optimized boundary of the target battery, wherein the optimized boundary comprises a temperature boundary, a current boundary and a state of charge boundary of the target battery, and determining a target current sequence of the target battery at a plurality of target temperatures according to the total charging time and the optimized boundary. By adopting the technical scheme, the problem that in the related technology, in the battery charging process, the relation between the temperature rise of the battery and the charging current cannot be balanced, and the charging efficiency of the battery is low is solved.

Inventors

ZHOU ZHAOCHENG
LI YANG
ZHANG WENJUN
ZHAO YI
GE HAILONG

Assignees

上海汽车集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241108

Claims (10)

1. A method of determining a current map, comprising: Calculating the charging time corresponding to each charging interval of the target battery, determining the total charging time of the target battery according to a plurality of charging times, and Determining an optimized boundary of the target battery, wherein the optimized boundary comprises a temperature boundary, a current boundary and a state of charge boundary of the target battery; Determining a target current sequence of the target battery at a plurality of target temperatures according to the total charging time and the optimization boundary; and determining a current map of the target battery according to a plurality of target current sequences, wherein the current map is used for indicating target charging currents of the target battery under different states of charge and different temperatures.
2. The method of determining a current map according to claim 1, wherein calculating a charging time corresponding to each charging interval of the target battery includes: Acquiring a plurality of preset charging currents corresponding to the target battery, wherein each preset charging current is the preset charging current in each state of charge; calculating a quotient between each charging interval and each preset charging current; And determining the charging time corresponding to each charging interval according to the battery pack capacity and the quotient of the target battery.
3. The method of determining a current map according to claim 1, wherein determining a target current sequence of the target battery at a plurality of target temperatures from the total charging time and the optimization boundary comprises: acquiring an initial current sequence corresponding to the target battery, wherein the initial current sequence comprises preset charging current of the target battery in each charging interval; Determining whether the target battery meets the optimization boundary in the case of charging the target battery according to the initial current sequence; And determining the target current sequence according to the initial current sequence and the total charging time under the condition that the target battery meets the optimization boundary.
4. A method of determining a current map according to claim 3, wherein determining whether the target battery satisfies the optimization boundary in the case of charging the target battery according to the initial current sequence comprises: Inputting the initial current sequence into a thermoelectric coupling model so that the thermoelectric coupling model outputs a state of charge change sequence and a temperature change sequence of the target battery under the initial current sequence; determining whether each state of charge value in the sequence of state of charge changes is within the state of charge boundary, and determining whether each temperature value in the sequence of temperature changes is within the temperature boundary; And determining that the target battery meets the optimized boundary under the condition that each state of charge value is determined to be in the state of charge boundary and each temperature value is determined to be in the temperature boundary.
5. A method of determining a current map according to claim 3, wherein determining the target current sequence from the initial current sequence and the total charging time comprises: Determining a target charging time of the target battery under the initial current sequence according to a plurality of charging intervals and the initial current sequence; and determining a difference value between the target charging time and the total charging time, and adjusting the initial current sequence according to the difference value to determine the target current sequence.
6. The method for determining a current map according to claim 1, wherein before determining the current map of the target battery based on a plurality of target current sequences, the method further comprises determining a charging temperature range corresponding to the target battery and determining a charging temperature step corresponding to the target battery; Dividing the charging temperature range into a plurality of charging temperature intervals according to the charging temperature step length; and determining a target current sequence of the target battery at the maximum charging temperature in each charging temperature interval according to the total charging time and the optimization boundary so as to acquire a plurality of target current sequences.
7. The method of determining a current map according to claim 1, wherein after determining the current map of the target battery from a plurality of target current sequences, the method further comprises determining a present state of charge and a present temperature of the target battery; And determining a first charging current corresponding to the current charge state and the current temperature in the current map so as to charge the target battery according to the first charging current.
8. A current map determining apparatus, comprising: The computing module is used for computing the charging time corresponding to each charging interval of the target battery, determining the total charging time of the target battery according to a plurality of charging times, and determining the optimized boundary of the target battery, wherein the optimized boundary comprises a temperature boundary, a current boundary and a state of charge boundary of the target battery; A determining module for determining a target current sequence of the target battery at a plurality of target temperatures according to the total charging time and the optimization boundary; And the planning module is used for determining a current map of the target battery according to a plurality of target current sequences, wherein the current map is used for indicating target charging currents of the target battery under different states of charge and different temperatures.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when run, performs the method of any one of claims 1 to 7.
10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method according to any of the claims 1 to 7 by means of the computer program.

Description

Current map determining method and device, storage medium and electronic device Technical Field The application relates to the field of new energy automobile batteries, in particular to a method and a device for determining a current map, a storage medium and an electronic device. Background At present, new energy automobiles are widely applied, and lithium ion power batteries are used as the most common important energy devices of electric automobiles, and are also developed towards the directions of large battery capacity and high charging multiplying power. The operating current of a lithium battery is closely related to temperature due to its chemical characteristics. A large amount of heat is generated in the working process, and the larger the current is, the more heat is generated, and the high temperature has a great hazard to the safety of the battery and the service life of the battery core. Therefore, the battery management system needs to limit the charging current according to the State of Charge (SOC) and the temperature State of the battery. The longer charging time becomes one of the main factors limiting the popularization of new energy vehicles. The most commonly used charging method at present is to charge the electric vehicle main unit with the current multiplying power as large as possible within the capacity of the current battery. However, in the charging process, the charging current is controlled correspondingly after the temperature of the battery core is raised, so that the charging current is gradually reduced, the high-rate charging capability of the battery cannot be fully exerted, and the charging time is prolonged. Therefore, the related art cannot balance the relationship between the battery temperature rise and the charging current during the battery charging, resulting in an increase in the charging time. Aiming at the problem that in the related art, in the battery charging process, the relationship between the battery temperature rise and the charging current cannot be balanced, so that the charging efficiency of the battery is low, no effective solution is proposed at present. Accordingly, there is a need for improvements in the related art to overcome the drawbacks of the related art. Disclosure of Invention The embodiment of the application provides a method and a device for determining a current map, a storage medium and an electronic device, which at least solve the problem that in the related art, in the battery charging process, the relationship between battery temperature rise and charging current cannot be balanced, so that the battery charging efficiency is low. According to one aspect of the embodiment of the application, a method for determining a current map is provided, wherein the method comprises the steps of calculating charging time corresponding to each charging interval of a target battery, determining total charging time of the target battery according to a plurality of charging times, and determining an optimized boundary of the target battery, wherein the optimized boundary comprises a temperature boundary, a current boundary and a state of charge boundary of the target battery, determining a target current sequence of the target battery at a plurality of target temperatures according to the total charging time and the optimized boundary, and determining the current map of the target battery according to a plurality of target current sequences, wherein the current map is used for indicating target charging currents of the target battery at different states of charge and different temperatures. In an exemplary embodiment, calculating the charging time corresponding to each charging interval of a target battery includes obtaining a plurality of preset charging currents corresponding to the target battery, wherein each preset charging current is a preset charging current in each charging state, calculating a quotient between each charging interval and each preset charging current, and determining the charging time corresponding to each charging interval according to the battery pack capacity and the quotient of the target battery. In one exemplary embodiment, determining a target current sequence of the target battery at a plurality of target temperatures according to the total charging time and the optimization boundary comprises obtaining an initial current sequence corresponding to the target battery, wherein the initial current sequence comprises a preset charging current of the target battery in each charging interval, determining whether the target battery meets the optimization boundary when the target battery is charged according to the initial current sequence, and determining the target current sequence according to the initial current sequence and the total charging time when the target battery meets the optimization boundary. In one exemplary embodiment, determining whether the target battery meets the optimization boundary if the target b