CN-122000499-A - Temperature state determining method and device, storage medium and electronic device

CN122000499ACN 122000499 ACN122000499 ACN 122000499ACN-122000499-A

Abstract

The application discloses a method and a device for determining a temperature state, a storage medium and an electronic device, wherein the method comprises the steps of obtaining working current of a battery pack of a vehicle, wherein the working current at least comprises charging current and discharging current, and inputting the working current into a thermoelectric coupling model deployed in a battery management system of the vehicle to determine the temperature state of the battery pack, wherein the thermoelectric coupling model is a model established after battery cells of the battery pack are partitioned through temperature distribution of the battery pack in the working process. The method solves the problems that the application effect of the thermal model constructed by the traditional method is poor and the temperature state of the battery pack cannot be accurately determined due to the fact that the battery pack has a large number of battery cells and a complex structure in the related art, and achieves the technical effect of accurately determining the temperature state of the battery pack.

Inventors

ZHOU ZHAOCHENG
ZOU BIN
ZHANG WENJUN
ZHAO YI
GE HAILONG

Assignees

上海汽车集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. A method of determining a temperature state, applied to a vehicle, comprising: Acquiring working current of a battery pack of the vehicle, wherein the working current at least comprises charging current and discharging current; The working current is input into a thermoelectric coupling model deployed in a battery management system of the vehicle to determine the temperature state of the battery pack, wherein the thermoelectric coupling model is a model established after the battery cells of the battery pack are partitioned through the temperature distribution of the battery pack in the working process.
2. The method of claim 1, wherein before inputting the operating current into a thermocouple model disposed in a battery management system of the vehicle to determine a temperature state of the battery pack, the method further comprises: partitioning the battery cells of the battery pack according to the temperature distribution of the battery pack in the working process, and establishing a battery cell cluster thermal model of the battery pack according to the obtained battery cell partition; and interacting the electric core cluster thermal model with a second-order RC equivalent circuit model to establish the thermoelectric coupling model.
3. The method of claim 2, wherein partitioning the cells of the battery pack by the temperature profile of the battery pack during operation comprises: determining the temperature distribution of the battery pack during operation; And dividing the electric core of the battery pack into a central heat generating area and a peripheral heat generating area through the temperature distribution, wherein the central heat generating area and the peripheral heat generating area are connected through thermal resistance.
4. The method of claim 2, wherein building a thermal model of the cell clusters of the battery pack from the resulting cell partitions comprises: Establishing a battery cell heat generation model corresponding to the battery cell through the battery cell partition, and establishing a battery cell heat dissipation model corresponding to the battery cell through the battery cell partition; and determining the thermal model of the cell cluster through the thermal model of the cell and the thermal model of the cell.
5. The method of claim 4, wherein establishing a cell thermal model corresponding to the cell by the cell partition comprises: Calculating a first heat generation of a central heat generation area through a target principle and a second heat generation of a peripheral heat generation area through the target principle, wherein the cell partition comprises the central heat generation area and the peripheral heat generation area; the cell thermal model is determined by the first thermal generation and the second thermal generation.
6. The method of claim 4, wherein establishing a cell heat dissipation model corresponding to the cell by the cell partition comprises: Determining heat exchange between a first portion and a second portion of the battery pack, wherein the first portion is any one of all portions in the battery pack, the second portion is an adjacent portion of the any one portion among other portions, the other portions being portions of all portions except the any one portion, the all portions including at least the cell partitions; And determining the cell heat dissipation model through the heat exchange.
7. The method of claim 4, wherein determining the cell cluster thermal model from the cell thermal model and the cell thermal model comprises: performing charge and discharge tests on the battery pack based on an orthogonal test to obtain a characteristic scene data set of the battery pack under each characteristic scene, wherein each characteristic scene is a scene obtained by combining multiple target scenes, and the multiple target scenes comprise a temperature scene, an electric quantity scene, a thermal management state scene and a vehicle state scene; carrying out parameter identification on the characteristic scene data set by a least square method to determine the optimal parameters of the battery cell cluster thermal model under each characteristic scene; and determining the thermal model of the battery cell cluster through the optimal parameters.
8. A temperature state determination system, for use with a vehicle, comprising: The acquisition module is used for acquiring the working current of the battery pack of the vehicle, wherein the working current at least comprises a charging current and a discharging current; and the determining module is used for inputting the working current into a thermoelectric coupling model deployed in a battery management system of the vehicle so as to determine the temperature state of the battery pack, wherein the thermoelectric coupling model is a model established after the battery cells of the battery pack are partitioned through the temperature distribution of the battery pack in the working process.
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 claims 1 to 7 by means of the computer program.

Description

Temperature state determining method and device, storage medium and electronic device Technical Field The application relates to the field of new energy automobile battery management systems, in particular to a method and a device for determining a temperature state, a storage medium and an electronic device. Background At present, new energy automobiles (i.e. vehicles) are widely applied, and the requirements of consumers on the energy consumption, the endurance mileage precision and the service life of batteries (i.e. battery packs) of the whole automobile are continuously improved. In general, a battery system of a vehicle includes a sampling system, a thermal management system, and the like, wherein the sampling system samples voltage, current, temperature, and the like of a battery cell, the thermal management system makes the battery cell work in a proper temperature range, and the battery management system estimates a battery state, such as a state of charge (SOC), a state of health (SOH), and the like, according to sampling information. In the prior art, the temperature state of the battery core cannot be obtained, so that the battery state is difficult to evaluate accurately, and the problems of complaints of users caused by short continuous mileage of the vehicle, inaccurate estimation of the residual continuous mileage and the like can be caused. In the related art, an attempt is made to solve the problem that the temperature state of the battery cells cannot be obtained by constructing a thermal model of the battery pack, but the thermal model constructed by the traditional method has the problems of limited calculation precision, large operation amount, weak expandability, difficulty in being embedded into a battery management system for online application and the like due to the fact that the number of the battery cells of the power battery pack is large and the structure is complex. Aiming at the problems that in the related art, the traditional method has poor application effect of the thermal model constructed due to the large number of battery cells and complex structure of the battery pack, and the temperature state of the battery pack cannot be accurately determined, 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 temperature state, a storage medium and an electronic device, which are used for at least solving the problems that the application effect of a thermal model constructed by a traditional method is poor and the temperature state of a battery pack cannot be accurately determined due to the fact that the number of battery cells of the battery pack is large and the structure is complex. According to one aspect of the embodiment of the application, a method for determining a temperature state is provided and applied to a vehicle, and the method comprises the steps of obtaining working current of a battery pack of the vehicle, wherein the working current at least comprises charging current and discharging current, and inputting the working current into a thermoelectric coupling model deployed in a battery management system of the vehicle to determine the temperature state of the battery pack, wherein the thermoelectric coupling model is a model established after battery cells of the battery pack are partitioned through temperature distribution of the battery pack in a working process. In one exemplary embodiment, before inputting the operating current into a thermoelectric coupling model deployed in a battery management system of the vehicle to determine a temperature state of the battery pack, the method further includes partitioning cells of the battery pack by the temperature distribution of the battery pack during operation and establishing a cell cluster thermal model of the battery pack by the obtained cell partitions, and interacting the cell cluster thermal model with a second order RC equivalent circuit model to establish the thermoelectric coupling model. In one exemplary embodiment, partitioning the cells of the battery pack by the temperature distribution of the battery pack during operation includes determining the temperature distribution of the battery pack during operation, and dividing the cells of the battery pack into a central heat generation area and a peripheral heat generation area by the temperature distribution, wherein the central heat generation area and the peripheral heat generation area are connected by a thermal resistance. In an exemplary embodiment, establishing a thermal model of a battery cell cluster of the battery pack through the obtained battery cell partition comprises establishing a battery cell heat generation model corresponding to the battery cell through the battery cell partition, and establishing a battery cell heat dissipati