CN-121989762-A - Battery heating system, method, apparatus, electronic device, and computer program product

CN121989762ACN 121989762 ACN121989762 ACN 121989762ACN-121989762-A

Abstract

The invention discloses a battery heating system, a battery heating method, a battery heating device, electronic equipment and a computer program product, and relates to the technical field of electric automobiles. The method comprises the steps of detecting the temperature of a battery at the battery under the condition that the battery is in a charging state, starting a locked-rotor heating mode of a motor under the condition that the temperature of the battery is smaller than a first temperature threshold value, detecting the temperature of the motor at the motor, and adjusting a preset valve in a thermal circulation pipeline from a first state to a second state under the condition that the temperature of the motor is larger than a second temperature threshold value, wherein a heat transfer medium independently circulates in the first thermal circulation pipeline and the second thermal circulation pipeline under the condition of the first state, and the heat transfer medium circulates in a pipeline formed by the first thermal circulation pipeline and the second thermal circulation pipeline under the condition of the second state. The invention solves the technical problems that PTC heat is not absorbed effectively and the temperature of the battery is slowly raised due to the low initial temperature of the motor in a low-temperature environment.

Inventors

Xia Geru
HE ZHONGQING
WANG JUNNIAN
GUO YUANKE
LI LILI
WANG YUWEN
LU XINGQI
ZHAO YANG
LI YUKUAN
ZHANG MEIYU

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260330

Claims (10)

1. A battery heating system, characterized by a thermal circulation line for thermal management while a battery is in a charged state, comprising: A first thermal circulation line for managing heat of the motor through a heat transfer medium; A second thermal circulation line for managing heat of the battery through the heat transfer medium; the preset valve is used for controlling the separation and combination of the first thermal circulation pipeline and the second thermal circulation pipeline, wherein the heat transfer medium is respectively circulated in the first thermal circulation pipeline and the second thermal circulation pipeline under the condition that the preset valve is in a first state, and the heat transfer medium is circulated in a pipeline formed by the first thermal circulation pipeline and the second thermal circulation pipeline together under the condition that the preset valve is in a second state; And the control device is used for adjusting the preset valve from the first state to the second state under the condition that the battery temperature at the battery is smaller than a first temperature threshold and the motor temperature at the motor is larger than a second temperature threshold.
2. The system of claim 1, wherein the system further comprises: the control device is further configured to start a locked-rotor heating mode of the motor if the battery temperature is less than the first temperature threshold.
3. The system of claim 1, wherein the preset valve comprises: A first four-way valve, wherein a first port and a second port are connected to the first thermal circulation pipeline, a third port and a fourth port are connected to the second thermal circulation pipeline, the first port is communicated with the second port when the preset valve is in the first state, the third port is communicated with the fourth port, the first port is communicated with the fourth port when the preset valve is in the second state, and the second port is communicated with the third port; The second four-way valve is characterized in that a fifth port and a sixth port are connected to the first thermal circulation pipeline, and a seventh port and an eighth port are connected to the second thermal circulation pipeline; the fifth port communicates with the sixth port and the seventh port communicates with the eighth port when the preset valve is in the first state, and the fifth port communicates with the eighth port and the sixth port communicates with the seventh port when the preset valve is in the second state.
4. The system of claim 1, wherein the system further comprises: A first liquid pump for controlling the flow of the heat transfer medium in the first thermal circulation line; And a second liquid pump for controlling the flow of the heat transfer medium in the first thermal circulation line.
5. The system of claim 1, wherein the system further comprises: The first temperature sensor is arranged on the first heat circulation pipeline and used for detecting the temperature of the first heat circulation pipeline as the temperature of the motor; and the second temperature sensor is arranged on the second heat circulation pipeline and used for detecting the temperature of the second heat circulation pipeline as the battery temperature.
6. The system of claim 1, wherein the second thermal circuit further comprises: A heater for providing heat to the heat transfer medium in the second thermal cycle line; the control device is further configured to activate the heater if the battery temperature is less than the first temperature threshold.
7. A battery heating method, characterized by comprising: Detecting a battery temperature at a battery while the battery is in a charged state; under the condition that the temperature of the battery is smaller than a first temperature threshold value, starting a locked-rotor heating mode of the motor; Detecting the temperature of the motor at the motor when the motor is in the locked-rotor heating mode; And when the temperature of the motor is greater than a second temperature threshold value, adjusting a preset valve in a thermal circulation pipeline from a first state to a second state, wherein the thermal circulation pipeline comprises a first thermal circulation pipeline for managing heat of the motor through a heat transfer medium, a second thermal circulation pipeline for managing heat of the battery through the heat transfer medium, the heat transfer medium is respectively circulated in the first thermal circulation pipeline and the second thermal circulation pipeline when the preset valve is in the first state, and the heat transfer medium is circulated in a pipeline formed by the first thermal circulation pipeline and the second thermal circulation pipeline when the preset valve is in the second state.
8. A battery heating apparatus, comprising: a first detection module for detecting a battery temperature at a battery in a state of charge of the battery; the starting module is used for starting a locked-rotor heating mode of the motor under the condition that the temperature of the battery is smaller than a first temperature threshold value; The second detection module is used for detecting the temperature of the motor at the motor when the motor is in the locked-rotor heating mode; The adjusting module is used for adjusting a preset valve in a thermal circulation pipeline from a first state to a second state under the condition that the temperature of the motor is larger than a second temperature threshold, wherein the thermal circulation pipeline comprises a first thermal circulation pipeline for managing heat of the motor through a heat transfer medium, a second thermal circulation pipeline for managing heat of the battery through the heat transfer medium, the heat transfer medium respectively circulates in the first thermal circulation pipeline and the second thermal circulation pipeline under the condition that the preset valve is in the first state, and the heat transfer medium circulates in a pipeline formed by the first thermal circulation pipeline and the second thermal circulation pipeline under the condition that the preset valve is in the second state.
9. An electronic device comprising a memory and a processor for running a program stored in the memory, wherein the program when run performs the battery heating method of claim 7.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the battery heating method of claim 7.

Description

Battery heating system, method, apparatus, electronic device, and computer program product Technical Field The present invention relates to the field of electric automobiles, and in particular, to a battery heating system, a method, an apparatus, an electronic device, and a computer program product. Background The low temperature environment poses a serious challenge to the charging performance of the electric automobile, and becomes one of the core bottlenecks restricting the popularization and user experience. Under the low-temperature condition, the viscosity of electrolyte in the lithium ion battery is increased sharply, the conductivity is reduced, the lithium intercalation process of the cathode material is blocked seriously, and the internal resistance of the battery is increased exponentially. The deterioration of the electrochemical characteristics brings a series of chain reactions, and in order to avoid potential safety hazards such as lithium precipitation and the like and protect the service life of a battery, a battery management system needs to limit the charging current to a low level, so that the charging power is greatly reduced, and the low-temperature charging time is obviously prolonged. These aggravate "anxiety of charging" of users in cold district, the long waiting time of charging has greatly impaired electric automobile convenience of use and satisfaction, these are unfavorable for electric automobile long duration permeability's promotion. Therefore, how to raise the battery temperature as soon as possible in a low-temperature environment has an important role in reducing the performance degradation of the electric vehicle caused by low temperature. The main stream solution at present mainly adopts an external positive temperature coefficient (Positive Temperature Coefficient, PTC) heater, and before and during battery charging, the cooling liquid of a liquid cooling loop of the power battery is heated, and heat is transferred to the electric core through a liquid cooling plate to realize heating effect. Along with the development of electric automobile technology, the scheme of utilizing motor locked rotor to generate heat to heat a power battery starts to be applied to electric automobile products, a PTC-free automobile of a certain automobile type is researched, a power battery loop is heated only through motor locked rotor and common heating of a motor controller, a valve body switching strategy of the power battery loop and a power system loop under a charging scene is analyzed, and the scheme is low in heating power. The application research of the motor locked rotor heating scheme is more focused on driving working conditions, whether the motor locked rotor heating and target driving power are required to be started or not is judged through the working conditions of a vehicle, a battery heating target or a passenger cabin heating requirement, the heating power requirement of the vehicle, the motor loss power and the vehicle driving working condition information are researched, the target power of the motor is confirmed, then a universal characteristic noise diagram of the motor is inquired, the target rotating speed and the target torque of the motor are obtained, the working efficiency interval of the motor is controlled, the motor heating value is increased by utilizing a motor low-efficiency area, the driving requirement and the heating requirement of the vehicle are considered, and the control strategy and the performance influence of the motor locked rotor heating under the charging working conditions are not mentioned. In the existing researches, the researches on the locked-rotor heating of the motor are concentrated on a control strategy of the motor, a thermal management scheme of a motor assembly, a thermal simulation model and the like, and the problems that the PTC heat is absorbed in an invalid way and the temperature of a battery is slowly raised due to the fact that the initial temperature of the motor is too low in a low-temperature environment are solved due to the lack of the researches applied to the whole vehicle under the low-temperature charging working condition. Aiming at the problems that PTC heat is not absorbed effectively and the temperature of a battery is slowly raised due to the fact that the initial temperature of a motor is too low in the low-temperature environment, no effective solution is proposed at present. Disclosure of Invention The embodiment of the invention provides a battery heating system, a battery heating method, a battery heating device, an electronic device and a computer program product, which at least solve the technical problems that PTC heat is not absorbed and the temperature of a battery is slowly increased due to the fact that the initial temperature of a motor is too low in a low-temperature environment. According to one embodiment of the invention, a battery heating system is provided, which is used for conducting he