CN-121973674-A - Heating film control method and device, whole vehicle controller and vehicle

CN121973674ACN 121973674 ACN121973674 ACN 121973674ACN-121973674-A

Abstract

The application relates to a heating film control method and device, a whole vehicle controller and a vehicle. The method comprises the steps of obtaining direct current bus voltage of a power supply end of a heating film under the condition that a battery operation condition is a low-temperature operation condition, determining target power parameters of the heating film based on the direct current bus voltage and resistance of the heating film, sending the target power parameters to a battery management system, and controlling the heating film to be in contact with the battery to heat by the target power parameters. By adopting the method, the calculated power distribution parameters of the heating film can be accurately matched with the actual power of the heating film, so that the waste caused by excessive power distribution due to direct use of the maximum theoretical power of the heating film is avoided, and the power utilization rate of the whole vehicle system is further improved.

Inventors

XU LILI
TONG LIXIAN
LIU YIQIANG
YU LIKUN
Du Denggao
WU JIE
WANG YONGJIAN
WANG XIAOFEI
WU DI

Assignees

极光湾(宁波)智能科技有限公司
极光湾科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260302

Claims (10)

1. The heating film control method is characterized by being applied to a whole vehicle controller, and comprises the following steps: Under the condition that the battery operation condition is a low-temperature operation condition, acquiring the voltage of a direct-current bus at the power supply end of the heating film; determining a target power parameter of the heating film based on the direct current bus voltage and the resistance of the heating film; And the target power parameter is used for controlling the heating film to heat the contacted battery.
2. The method of claim 1, wherein the determining a target power parameter for the heating film based on the dc bus voltage and the resistance of the heating film comprises: Determining an initial power parameter of the heating film based on the direct current bus voltage and the resistance of the heating film; And correcting the initial power parameter based on the voltage change parameter and the voltage change rate of the heating film in a preset time period to obtain the target power parameter.
3. The method of claim 2, wherein the correcting the initial power parameter based on the voltage change parameter and the voltage change rate of the heating film in the preset time period to obtain the target power parameter includes: determining a corresponding heating film power correction value according to the voltage change parameter and the voltage change rate; And correcting the initial power parameter according to the heating film power correction value to obtain the target power parameter.
4. The method of claim 2, wherein the determining an initial power parameter of the heating film based on the dc bus voltage and the resistance of the heating film comprises: determining an operating current of the heating film based on the dc bus voltage and the resistance of the heating film; the initial power parameter is determined based on the dc bus voltage and the operating current.
5. The method according to any one of claims 1-4, wherein the low temperature operation condition is an ac preheating condition, and wherein the obtaining the dc bus voltage of the power supply terminal of the heating film when the battery operation condition is the low temperature operation condition includes: And under the condition that the battery operation working condition is the alternating current preheating working condition, acquiring the DCDC end output voltage of the direct current bus of the power supply system as the direct current bus voltage of the power supply end of the heating film.
6. The method according to any one of claims 1-4, wherein the low temperature operation condition is a battery heating condition, and wherein the obtaining the dc bus voltage of the power supply terminal of the heating film when the battery operation condition is the low temperature operation condition includes: and under the condition that the battery operation working condition is the battery heating working condition, acquiring the power battery pack voltage of the direct current bus of the power supply system as the direct current bus voltage of the power supply end of the heating film.
7. The method of any one of claims 1-4, wherein prior to obtaining the dc bus voltage at the power supply end of the heating film when the battery operating condition is a low temperature operating condition, the method further comprises: and under the condition that a heating request sent by a battery management system is received, acquiring the battery operation working condition of the battery.
8. A heating film control device, characterized in that it is applied to a vehicle control unit, the device includes: the acquisition module is used for acquiring the direct current bus voltage of the heating film power supply end under the condition that the battery operation condition is a low-temperature operation condition; A determining module for determining a target power parameter of the heating film based on the dc bus voltage and the resistance of the heating film; And the target power parameter is used for controlling the heating film to heat the contacted battery.
9. A vehicle control unit comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method according to any one of claims 1 to 7 when executing the computer program.
10. A vehicle comprising the vehicle control unit according to claim 9.

Description

Heating film control method and device, whole vehicle controller and vehicle Technical Field The application relates to the technical field of power batteries, in particular to a heating film control method and device, a whole vehicle controller and a vehicle. Background With the rapid development of new energy automobile power battery technology, the market demand for efficient and reliable battery thermal management systems is growing. Conventional battery heating techniques (such as air heating and coolant heating) have significant limitations in terms of heating efficiency, uniformity, space occupation, and weight, particularly in high power and high energy density battery applications. Therefore, a battery film heating technology has been developed, which can effectively improve heating performance and system reliability by directly contacting a heating film with a battery. When a Battery film heating technology is used for heating a Battery, the heating film needs to be effectively controlled, and the current heating film control mode can be summarized in that a whole vehicle controller distributes power according to the maximum theoretical power of the heating film to obtain and send a power distribution value to a Battery management system (Battery MANAGEMENT SYSTEM, BMS), after the BMS receives the power distribution value, whether a heating condition is met or not is judged, and after the heating condition is met, the heating film is started to heat the Battery. However, the actual power value and the maximum theoretical power value in the working process of the heating film are large in difference, so that the power distribution is unreasonable, and the problem of power resource distribution waste is easily caused. Disclosure of Invention Based on the above, it is necessary to provide a heating film control method, a heating film control device, a whole vehicle controller and a vehicle, which can ensure reasonable power distribution and avoid waste of power resource distribution. In a first aspect, the present application provides a heating film control method, applied to a vehicle controller, including: Under the condition that the battery operation condition is a low-temperature operation condition, acquiring the voltage of a direct-current bus at the power supply end of the heating film; Determining a target power parameter of the heating film based on the direct current bus voltage and the resistance of the heating film; and sending a target power parameter to the battery management system, wherein the target power parameter is used for controlling the heating film to heat the battery in contact. In one embodiment, determining the target power parameter of the heating film based on the dc bus voltage and the resistance of the heating film includes: Determining an initial power parameter of the heating film based on the direct current bus voltage and the resistance of the heating film; and correcting the initial power parameter based on the voltage change parameter and the voltage change rate of the heating film in a preset time period to obtain a target power parameter. In one embodiment, the correcting the initial power parameter based on the voltage variation parameter and the voltage variation rate of the heating film in the preset time period to obtain the target power parameter includes: determining a corresponding heating film power correction value according to the voltage change parameter and the voltage change rate; And correcting the initial power parameter according to the heating film power correction value to obtain a target power parameter. In one embodiment, determining the initial power parameter of the heating film based on the dc bus voltage and the resistance of the heating film includes: determining the working current of the heating film based on the direct current bus voltage and the resistance of the heating film; an initial power parameter is determined based on the dc bus voltage and the operating current. In one embodiment, the low-temperature operation condition is an ac preheating condition, and under the condition that the battery operation condition is the low-temperature operation condition, obtaining the dc bus voltage of the power supply end of the heating film includes: Under the condition that the battery operation working condition is an alternating-current preheating working condition, the DCDC end output voltage of the direct-current bus of the power supply system is obtained and used as the direct-current bus voltage of the power supply end of the heating film. In one embodiment, the low-temperature operation condition is a battery heating condition, and under the condition that the battery operation condition is the low-temperature operation condition, obtaining the dc bus voltage of the power supply end of the heating film includes: Under the condition that the battery operation working condition is the battery heating working condition, the power batt