CN-118494141-B - Thermal management system and vehicle with same

CN118494141BCN 118494141 BCN118494141 BCN 118494141BCN-118494141-B

Abstract

The invention discloses a thermal management system and a vehicle with the same, wherein the thermal management system comprises a compressor and a first heat exchange piece, the compressor is provided with an exhaust port and an air suction port, the first heat exchange piece is suitable for heat exchange with a battery, two ends of the first heat exchange piece are respectively communicated with the exhaust port and the air suction port, and the compressor is configured to control the temperature T1 of a refrigerant at an inlet of the first heat exchange piece to meet T2< T1< T3 in a uniform temperature mode, wherein T2 is the lowest temperature of the battery, and T3 is the highest temperature of the battery. According to the heat management system provided by the embodiment of the invention, the temperature of the refrigerant at the inlet of the first heat exchange piece is controlled so as to realize the uniform temperature treatment of the battery, so that the temperature difference of the battery is reduced, the battery has better charging uniformity, and the service life of the battery is prolonged.

Inventors

LING HEPING
HUANG WEI
MA RUI
Guo Musheng
LUO YILI

Assignees

比亚迪股份有限公司
比亚迪汽车工业有限公司

Dates

Publication Date: 20260505
Application Date: 20240422

Claims (14)

1. A thermal management system, comprising: a compressor having a discharge port and a suction port; the first heat exchange piece is suitable for heat exchange with the battery, and two ends of the first heat exchange piece are respectively communicated with the exhaust port and the air suction port to circulate the refrigerant; A controller electrically connected to the compressor; wherein the controller is configured to perform the following control flow: when the lowest temperature T2 of the battery is detected to be lower than a second heating temperature, controlling the thermal management system to enter a self-heating mode, and charging and discharging the battery in the self-heating mode to heat; When the lowest temperature T2 of the battery reaches a first heating temperature in the self-heating mode, controlling the thermal management system to switch to a first heating mode, and controlling the compressor to operate in the first heating mode so that a refrigerant flows through the first heat exchange piece to heat the battery, wherein the second heating temperature is lower than the first heating temperature; When the lowest temperature T2 of the battery reaches a fifth set temperature in the first heating mode, controlling the thermal management system to switch to an internal circulation mode, wherein in the internal circulation mode, the controller controls the thermal management system to operate in a temperature equalization mode, and the compressor is configured to control the temperature T1 of the refrigerant at the inlet of the first heat exchange piece to meet T2< T1< T3 in the temperature equalization mode, wherein T2 is the lowest temperature of the battery, and T3 is the highest temperature of the battery; The method comprises the steps of controlling the temperature T1 of a refrigerant flowing to a first heat exchange piece to be close to the highest temperature T3 of a battery under the condition that a first condition is met, wherein the first condition comprises that the ambient temperature is less than or equal to a first set temperature H1, the second set temperature T4 is less than or equal to a battery lowest temperature T2 and is less than or equal to a third set temperature T5, and the battery temperature difference delta T is greater than or equal to a first set threshold value, and controlling the temperature T1 of the refrigerant flowing to the first heat exchange piece to be close to the battery lowest temperature T2 under the condition that the second condition is met, wherein the second condition comprises that the ambient temperature is less than or equal to the first set temperature H1, the third set temperature T5 is less than or equal to a fourth set temperature T6, and the battery temperature difference delta T is greater than or equal to a first set threshold value.
2. The thermal management system of claim 1, wherein the controller is configured to control a rotational speed of the compressor in the soaking mode.
3. The thermal management system of claim 2, wherein the soaking mode comprises a first soaking mode in which a first end of the first heat exchange member is in communication with the exhaust port and a second soaking mode in which a second end of the first heat exchange member is in communication with the intake port; In the second temperature equalization mode, the first end of the first heat exchange piece is communicated with the air suction port, and the second end of the first heat exchange piece is communicated with the air exhaust port.
4. A thermal management system according to claim 3, wherein the thermal management system comprises an adjustable valve having a first end connected to the exhaust port by a first electrically controlled valve and to the suction port by a second electrically controlled valve, and a second end connected to the first end of the first heat exchange member.
5. The thermal management system of claim 4, comprising a throttling element having a first end coupled to the second end of the first heat exchange member, the second end of the throttling element adapted to be coupled to the first end of the heat exchanger via a first unidirectional flow passage and to be coupled to the second end of the heat exchanger via a second unidirectional flow passage; The refrigerant flow directions of the first unidirectional flow channel and the second unidirectional flow channel are opposite, the second end of the heat exchanger is used for being connected with the air suction port through a third electric control valve, and the first end of the heat exchanger is used for being connected with the air exhaust port through a fourth electric control valve.
6. The thermal management system of claim 5, wherein the controller is configured to control the first electrically controlled valve to open, the second electrically controlled valve to close, the third electrically controlled valve to open, and the fourth electrically controlled valve to close if a first condition is met.
7. The thermal management system of claim 5, wherein the controller is configured to control the first electrically controlled valve to close, the second electrically controlled valve to open, the third electrically controlled valve to close, and the fourth electrically controlled valve to open if a second condition is met.
8. The thermal management system of claim 2, wherein the controller is further configured to: and under the condition that a third condition is met, controlling the thermal management system to exit the uniform temperature mode, wherein the third condition comprises a battery temperature difference delta T being less than or equal to a second set threshold value, and the battery temperature difference delta T=T3-T2.
9. The thermal management system of claim 2, wherein the controller is further configured to: And controlling the thermal management system to be in the uniform temperature mode under the condition that a fourth condition is met, wherein the fourth condition comprises a battery temperature difference delta T > a first set threshold value, and the battery temperature difference delta T=T3-T2.
10. The thermal management system of claim 2, further comprising: The cooling liquid subsystem comprises a first heat exchange flow channel, a circulating pump and a second heat exchange piece are arranged on the first heat exchange flow channel, and the second heat exchange piece can exchange heat with the electronic control module; The second heat exchange flow passage is connected between the first heat exchange piece and the compressor and is used for carrying out heat exchange with the first heat exchange flow passage.
11. The thermal management system of claim 10, wherein a first end of the first heat exchange member is in communication with the compressor discharge port and a second end of the first heat exchange member is in communication with the suction port through the second heat exchange flow passage; In the first heating mode, the controller is used for controlling the circulating pump to be started so as to enable the first heat exchange flow channel and the second heat exchange flow channel to exchange heat.
12. The thermal management system of claim 11, wherein in an internal circulation mode, the controller is configured to control the circulation pump to be on.
13. The thermal management system of claim 12 wherein the controller is further configured to control the thermal management system to exit the internal circulation mode if a fifth condition is met, the fifth condition comprising a coolant temperature of the coolant subsystem being below a sixth set temperature.
14. A vehicle characterized by comprising a thermal management system according to any of claims 1-13.

Description

Thermal management system and vehicle with same Technical Field The invention relates to the technical field of vehicles, in particular to a thermal management system and a vehicle with the same. Background In the prior art, in order to maintain the temperature of the battery in a proper temperature range during the working process, a thermal management system is generally arranged to adjust the temperature of the battery, which is beneficial to improving the working performance of the battery. However, when the temperature of the battery is regulated, especially when the battery is heated by low-temperature charging, the conventional thermal management system usually stops heating the battery after regulating the highest temperature of the battery to a fixed temperature threshold, at this time, the temperature difference of the battery tends to be large, and the temperature difference also continues to increase along with the large-current charging, so that the charging uniformity of the battery is affected, and the service life of the battery is shortened. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a thermal management system which can realize temperature adjustment of the battery and reduce the temperature difference of the battery, so that the battery has better charging uniformity, the service life of the battery is prolonged, and the technical problem that the temperature difference of the battery is large after the thermal management system in the prior art adjusts the temperature of the battery is solved. The invention also aims to provide a vehicle with the thermal management system. The heat management system comprises a compressor, a first heat exchange piece and a compressor, wherein the compressor is provided with a gas outlet and a gas inlet, the first heat exchange piece is suitable for heat exchange with a battery, two ends of the first heat exchange piece are respectively communicated with the gas outlet and the gas inlet, and the compressor is configured to control the temperature T1 of a refrigerant at the inlet of the first heat exchange piece to meet T2< T1< T3 in a uniform temperature mode, wherein T2 is the lowest temperature of the battery, and T3 is the highest temperature of the battery. According to the thermal management system provided by the embodiment of the application, the temperature T1 of the refrigerant at the inlet of the first heat exchange piece is controlled by the compressor in the temperature equalization mode, and the temperature T1 of the refrigerant at the inlet of the first heat exchange piece is controlled between the lowest temperature T2 of the battery and the highest temperature T3 of the battery, so that when the refrigerant flows into the first heat exchange piece to exchange heat with the battery, the lowest temperature of the battery can be raised by the refrigerant, the highest temperature of the battery can be lowered, and the purpose of performing temperature equalization treatment on the battery can be achieved, so that the difference value of the battery is reduced, the battery has better charging uniformity, and the service life of the battery is prolonged. That is, the thermal management system of the present application can perform temperature equalization treatment on the battery while realizing temperature adjustment on the battery, so as to reduce the temperature difference of the battery. In some embodiments, the thermal management system further comprises a controller electrically coupled to the compressor, the controller configured to control a rotational speed of the compressor in the soaking mode. In some embodiments, the temperature equalization mode includes a first temperature equalization mode in which a first end of the first heat exchange member is in communication with the exhaust port and a second end of the first heat exchange member is in communication with the intake port, and a second temperature equalization mode in which the first end of the first heat exchange member is in communication with the intake port and the second end of the first heat exchange member is in communication with the exhaust port. In some embodiments, the thermal management system includes an adjustable valve having a first end coupled to the exhaust port via a first electrically controlled valve and coupled to the intake port via a second electrically controlled valve, and a second end coupled to the first end of the first heat exchange member. In some embodiments, the thermal management system comprises a throttling element, a first end of the throttling element is connected with a second end of the first heat exchange piece, a second end of the throttling element is suitable for being connected with a first end of the heat exchanger through a first unidirectional flow passage and is suitable for being connected with a second end of the