CN-122008810-A - Thermal management system and control method with same

CN122008810ACN 122008810 ACN122008810 ACN 122008810ACN-122008810-A

Abstract

The invention discloses a heat management system and a control method with the same, which realize the sharing and recycling of cold and hot resources through an integrated flow path design. The system comprises a motor thermal management loop, a battery thermal management loop, a refrigerant refrigerating main path and a cockpit air conditioning module. The motor thermal management loop can be selectively coupled with the battery thermal management loop or the cockpit heating heat exchanger through valve control, and the motor waste heat is used for battery thermal insulation or cockpit heating. The invention solves the technical problems of discrete redundancy and low energy utilization rate of the traditional thermal management system, and realizes the light weight of the system and the high-efficiency cascade utilization of energy while ensuring the accurate temperature control of each part.

Inventors

ZHANG WEI
JIANG HUAN
LIU JINGANG
FU BING
ZHOU XUAN
LI TIEHUI
XIA YUNQING
JIN HAILIANG
MA DONGYANG

Assignees

湘潭大学

Dates

Publication Date: 20260512
Application Date: 20260312

Claims (10)

1. A thermal management system, comprising: The motor thermal management loop (2) comprises a stator radiator (11), a first heater (21), a three-way valve A (22), a thermostat (23), a three-way valve B (24), a normal-temperature radiator (25), a three-way valve C (26), a four-way valve (27) and a motor water pump (28), which are connected in series to form a loop through pipelines; A battery thermal management loop (3), wherein the battery thermal management loop (3) comprises a battery pack (31), a first heat exchanger (32), a battery oil pump (33), a second heater (34) and a second heat exchanger (35) which are connected in series to form a loop; A refrigerant refrigerating main path (4), wherein the refrigerant refrigerating main path (4) comprises a refrigerant reflux valve (41), a gas-liquid separator (42), a compressor (43), a condenser (44), an expansion valve (45) and a refrigerant output valve (46) which are sequentially connected in series through pipelines so as to form a refrigerant cooling path; A cockpit air conditioning module (5), the cockpit air conditioning module (5) comprising a cockpit refrigeration heat exchanger (51) and a cockpit heating heat exchanger (52); Wherein the refrigerant refrigerating main path (4) is configured through the refrigerant return valve (41) and the refrigerant output valve (46) to be capable of selectively switching a refrigerant flow path thereof to be communicated with a rotor radiator (12), the first heat exchanger (32) or the cabin refrigerating heat exchanger (51) so as to form an active refrigerating mode for a motor rotor, a battery pack (31) or a cabin respectively; The three-way valve A (22) and the four-way valve (27) are selectively communicated with the second heat exchanger (35) through pipelines to realize thermal coupling of the motor thermal management loop (2) and the second heat exchanger (35) for preheating or heat preservation of the battery pack (31), and the three-way valve B (24) and the three-way valve C (26) are selectively communicated with the cockpit heating heat exchanger (52) through pipelines to heat the cockpit by utilizing waste heat of the motor thermal management loop (2).
2. A thermal management system according to claim 1, wherein the first heat exchanger (32) is a refrigerant-oil heat exchanger and the second heat exchanger (35) is a water-oil heat exchanger.
3. The heat management system according to claim 2, wherein the refrigerant return valve (41) and the refrigerant output valve (46) are four-way valves, four ports of the refrigerant return valve (41) are connected to an inlet of the gas-liquid separator (42), an outlet of the cabin refrigeration heat exchanger (51), an outlet of the refrigerant side passage of the first heat exchanger (32), and an outlet of the stator radiator (11), respectively, and four ports of the refrigerant output valve (46) are connected to an outlet of the expansion valve (45), an inlet of the cabin refrigeration heat exchanger (51), an inlet of the refrigerant side passage of the first heat exchanger (32), and an inlet of the rotor radiator (12), respectively.
4. A thermal management system according to claim 1, characterized in that the cabin air conditioning module (5) further comprises an air heating device (53), said air heating device (53) being arranged in parallel with said cabin heating heat exchanger (52).
5. A control method of a thermal management system according to any one of claims 1 to4, comprising selectively performing at least one of a motor warm-up mode, a battery warm-up mode, a cabin heating mode, and a motor high temperature forced cooling mode.
6. The control method according to claim 5, wherein the motor warm-up mode includes controlling the first heater (21) to be activated and controlling the three-way valve a (22), the three-way valve B (24), the three-way valve C (26) and the four-way valve (27) to circulate the coolant of the motor thermal management circuit (2) in an internal circuit constituted by the stator radiator (11), the first heater (21), the thermostat (23) and the motor water pump (28) without flowing through the normal-temperature radiator (25) and the second heat exchanger (35).
7. The control method according to claim 5, wherein the battery warm-up mode includes controlling the second heater (34) to be activated and controlling the battery oil pump (33) to operate so as to circulate the coolant of the battery thermal management circuit (3).
8. The control method according to claim 5, wherein the battery warm-up mode includes controlling the three-way valve A (22) and the four-way valve (27) to allow the fluid of the motor thermal management circuit (2) to flow through the second heat exchanger (35) while controlling the battery oil pump (33) to operate to allow the fluid of the battery thermal management circuit (3) to flow through the second heat exchanger (35) when the motor temperature is higher than a first set value, so as to maintain the battery temperature by using the motor waste heat.
9. The control method according to claim 5, wherein the cabin heating mode includes controlling the three-way valve B (24) and the three-way valve C (26) to flow the fluid of the motor thermal management circuit (2) through the cabin heating heat exchanger (52) to heat the cabin when the motor temperature is higher than a second set value.
10. The control method according to claim 5, wherein the high-temperature forced cooling mode of the motor comprises the steps of controlling the refrigerant return valve (41) and the refrigerant output valve (46) to enable the refrigerant refrigeration main path (4) to be communicated with the rotor radiator (12) so as to cool a motor rotor, and simultaneously controlling the three-way valve B (24) and the three-way valve C (26) to enable fluid of the motor thermal management circuit (2) to flow through the normal-temperature radiator (25) so as to cool a motor stator.

Description

Thermal management system and control method with same Technical Field The invention relates to the technical field of thermal management, in particular to a thermal management system and a control method with the same. Background With the rapid evolution of new energy technologies, the complexity and importance of thermal management systems are increasingly prominent. The driving motor, the power battery and the passenger cabin have different and strict requirements on the temperature environment, so that an efficient, compact and energy-saving thermal management system becomes a key for guaranteeing the performance, safety and cruising of the new energy vehicle. Currently, the mainstream solutions in the industry, while advancing, still present some challenges in common. Many systems provide relatively independent management loops for motors, batteries, and air conditioners. For example, the motor and battery may have separate cooling cycles and heat sinks, while the cooling and heating of the passenger compartment relies on another separate air conditioning system. This architecture inevitably results in repeated configuration of hardware such as the compressor, pump body, valve element and heat exchanger, increasing the overall mass, footprint and manufacturing costs of the system. More importantly, this split design makes it difficult for the heat generated by the components to be efficiently utilized in concert. A typical example is that a large amount of waste heat generated by the driving motor in operation is simply discharged to the outside air through a radiator in most systems, and cannot be used for preheating a battery pack or assisting in heating a passenger compartment at a low temperature, resulting in significant energy waste. At the same time, existing solutions tend to be challenging when the battery, motor (especially the high power rotor area) and passenger compartment need to be cooled at the same time. Some systems have parallel cooling paths for different components, but this can lead to maldistribution of cooling capacity or delayed system response, while others have employed multiple separate sets of refrigeration devices, which undoubtedly exacerbates the complexity and energy consumption of the system. How to intelligently, efficiently and quickly distribute the limited cooling capacity under the complex dynamic working condition is a problem to be solved urgently. In addition, under the low-temperature environment, the heating of the battery pack and the warm keeping of the passenger cabin are highly dependent on a high-power electric heater (PTC), so that the battery electric quantity can be directly and largely consumed, and the PTC is one of core factors which cause the serious shrinkage of the electric automobile in the winter range. Although the importance of recovering the waste heat of the electric drive system has become industry consensus, the existing waste heat recovery scheme is difficult to realize economic, efficient and reliable large-scale application in engineering due to complex pipeline design, low heat exchange efficiency or poor integration level with other systems of the whole vehicle. Current thermal management techniques are evolving towards deep integration and intelligent collaboration. The market needs an innovative system design scheme which can fundamentally realize the centralized sharing of cooling resources and the on-demand flow of heat through an optimized physical architecture and intelligent control logic. The ideal goal is to improve the overall heat management efficiency and reduce the energy consumption of the system on the premise of not increasing or even reducing the number of hardware, thereby providing solid support for improving the energy efficiency and the endurance mileage of the whole vehicle. Therefore, how to provide a new thermal management system and a control method with the same, which can realize the integrated efficient management of the temperature of the motor, the battery and the passenger cabin, and simultaneously can remarkably improve the energy utilization efficiency and the system compactness, is a problem to be solved by the technicians in the field. Disclosure of Invention In view of the foregoing, the present invention provides a thermal management system, which aims to solve the above-mentioned problems of discrete, redundant and low energy utilization in the conventional thermal management system. In order to achieve the above purpose, the present invention adopts the following technical scheme: a thermal management system, comprising: the motor heat management loop comprises a stator radiator, a first heater, a three-way valve A, a thermostat, a three-way valve B, a normal-temperature radiator, a three-way valve C, a four-way valve and a motor water pump which are connected in series to form a loop through pipelines; The battery thermal management loop comprises a battery pack, a first heat exchanger, a batt