CN-122008784-A - Nine-way valve-based step-by-step enhanced pure electric vehicle integrated thermal management system

CN122008784ACN 122008784 ACN122008784 ACN 122008784ACN-122008784-A

Abstract

The invention relates to the technical field of heat management of new energy automobiles, in particular to a step-by-step enhanced pure electric automobile integrated heat management system based on a nine-way valve. The system comprises a nine-way valve serving as a core pivot integrated by a heat management system, a passenger cabin heating loop, a battery heat management loop, an electric drive system cooling loop and a cooling fluid loop, wherein the cooling fluid loop is connected into the system through a port b and a port h of the nine-way valve, the cooling fluid loop is connected into the system through a port g and a port a of the nine-way valve, and the cooling fluid loop is connected into the system through a port e and a port f of the nine-way valve. According to the nine-way valve-based step-by-step enhanced pure electric vehicle integrated thermal management system, the nine-way valve is used as a core, so that pipelines are greatly simplified, the number of valve bodies is reduced, the cost, weight and arrangement space of the system are remarkably reduced, the reliability is improved, and a single basic design can be increased or decreased in a modularized manner through a step-by-step enhancement framework of 'nine-way valve- > + three-way valve- > + four-way valve', so that the vehicle types covering different positions from economy to luxury are derived.

Inventors

He Liange
WANG BO
ZHANG YAN
WU LIMIN
LIN CHUNJING
Qi chuang
LIU ZILIN
ZHANG YUEMANG

Assignees

重庆理工大学

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (9)

1. Nine-way valve-based step-by-step enhanced pure electric vehicle integrated thermal management system, which is characterized by comprising: a nine-way valve (12) as a core hub for thermal management system integration; a passenger cabin heating loop, wherein a cooling liquid flow path is connected into a system through a port b and a port h of the nine-way valve (12); A battery thermal management loop, wherein a cooling liquid flow path is connected into a system through a g port and an a port of the nine-way valve (12); an electric drive system cooling loop, wherein a cooling liquid flow path is connected into the system through an e port and an f port of the nine-way valve (12); The refrigerant loop exchanges heat with the passenger cabin heating loop and the battery heat management loop through a water-cooling condenser (2) and a water-cooling evaporator (8) respectively; the control module is used for controlling the port communication state of the nine-way valve (12) according to working condition instructions so as to switch the working modes of different loops; and/or, a composite structure of cold source relay cooling and double heat source enhanced heat pump is constructed by additionally arranging a four-way valve (23) between the cooling circuit of the electric drive system and the battery thermal management circuit.
2. The integrated thermal management system of the step-by-step enhanced pure electric vehicle based on the nine-way valve according to claim 1, wherein the passenger cabin heating loop comprises a passenger cabin water pump (13), a passenger cabin PTC heater (14) and a warm air core (15) which are sequentially connected, an inlet of the loop is connected with a b port of the nine-way valve (12), and an outlet of the loop is connected with an h port of the nine-way valve (12).
3. The integrated heat management system of the step-by-step enhanced pure electric vehicle based on the nine-way valve according to claim 1, wherein the battery heat management loop comprises a battery water pump (11), a battery PTC heater (10), a battery pack (9) and a water-cooling evaporator (8) which are sequentially connected, an inlet of the loop is connected with a g port of the nine-way valve (12), and an outlet of the loop is connected with an a port of the nine-way valve (12).
4. The integrated thermal management system of a step-by-step enhanced pure electric vehicle based on a nine-way valve according to claim 1, characterized in that the three-way valve (22) is arranged in the battery thermal management circuit, the a-port of the three-way valve (22) is connected to the outlet pipe of the battery pack (9), the b-port of the three-way valve (22) is connected to the water-side inlet of the water-cooled evaporator (8), and the c-port is connected to the inlet of the battery water pump (11); And the battery pack (9), the battery water pump (11) and the battery PTC heater (10) form an independent battery self-circulation loop by controlling the communication of the port a and the port c of the three-way valve (22).
5. The integrated heat management system of the step-by-step enhancement type pure electric vehicle based on the nine-way valve according to claim 1, wherein the cooling loop of the electric drive system comprises a motor water pump (18), a motor controller MCU (19), an auxiliary drive four-in-one (20) and a motor (21) which are sequentially connected, an inlet of the loop is connected with an e-port of the nine-way valve (12), an outlet of the loop is connected with an f-port of the nine-way valve (12), and heat dissipation is carried out through a low-temperature radiator (17).
6. The integrated heat management system of a step-by-step enhanced pure electric vehicle based on a nine-way valve according to claim 5, wherein an a port of the four-way valve (23) is connected to an output end of the battery heat management circuit, a b port of the four-way valve (23) is connected to an input end of the low-temperature radiator (17), a c port of the four-way valve (23) is connected to an output end of the cooling circuit of the electric drive system, and a d port of the four-way valve (23) is connected to an input end of the water-cooled evaporator (8).
7. The integrated heat management system of the step-by-step enhanced pure electric vehicle based on the nine-way valve according to claim 1 is characterized in that the refrigerant loop comprises a compressor (1), a water-cooled condenser (2), an air-cooled condenser (3), an expansion valve (4), a first stop valve (5), an air-cooled evaporator (6), a water-cooled evaporator (8) and a second stop valve (7) which are sequentially connected through pipelines, and the refrigerant loop exchanges heat with a cooling liquid loop through the water-cooled evaporator (8) to realize active refrigeration of a battery pack and realizes refrigeration of a passenger cabin through the air-cooled evaporator (6).
8. The integrated thermal management system of a step-by-step enhanced electric vehicle based on a nine-way valve of claim 5, wherein the control module is configured to perform at least one of the following modes of operation: Controlling the nine-way valve (12) to enable a port d to be communicated with a port b, a port h to be communicated with a port g, a port a to be communicated with a port i and a port e to be communicated with a port f, and specially supplying heat from the water-cooling condenser (2) to the passenger cabin heating loop, meanwhile, silencing the battery thermal management loop, and enabling the electric drive system cooling loop to operate in a small cycle; After the battery is heated, controlling the port d of the nine-way valve (12) to be communicated with the port g and the port a to be communicated with the port i, controlling the three-way valve (22) to be communicated with the port c, closing the compressor (1), and enabling the battery loop to enter a passive self-circulation heat preservation state; The cold source relay cooling mode comprises the steps of controlling an a port and a b port of a four-way valve (23) to be communicated, a d port and a c port to be communicated, controlling a three-way valve (22) to be communicated with the a port and a nine-way valve (12) to be communicated with the c port and the f port and the e port to enable battery cooling liquid to flow through a low-temperature radiator (17) for heat dissipation, and then switching a valve state to enable motor cooling liquid to flow through the low-temperature radiator (17) for heat dissipation so as to realize time-sharing cooling of the battery and an electric drive system; the double-heat-source enhanced heat pump heating mode is characterized in that an a port and a b port of the four-way valve (23) are controlled to be communicated, a d port and a c port of the four-way valve (23) are controlled to be communicated, a c port and an e port of the nine-way valve (12) are controlled to be communicated, an a port and a g port of the nine-way valve are controlled to be communicated, a d port and a b port of the nine-way valve are controlled to be communicated, and an h port and an i port of the nine-way valve are controlled to be communicated, so that cooling liquid can absorb heat from the environment and waste heat of an electric drive system at the same time, and the passenger cabin is heated efficiently through a heat pump system.
9. A pure electric vehicle, characterized by comprising a nine-way valve-based step-by-step enhanced pure electric vehicle integrated thermal management system as claimed in any one of claims 1 to 8.

Description

Nine-way valve-based step-by-step enhanced pure electric vehicle integrated thermal management system Technical Field The invention relates to the technical field of heat management of new energy automobiles, in particular to a step-by-step enhanced pure electric automobile integrated heat management system based on a nine-way valve. Background The pure electric vehicle (BEV) integrates a plurality of heat sources/temperature control components such as a driving motor, a motor controller, a power battery, an auxiliary driving four-in-one component and the like. The core task of the thermal management system is to ensure that each component works in an optimal temperature range and provide a comfortable temperature and humidity environment for the passenger cabin. The existing heat management system generally adopts a discrete or simple serial architecture, namely, circuits such as electric motor cooling, battery heat management, air conditioner warm air and the like are independent or are coupled only through a simple heat exchanger. These systems achieve basic cooling and heating functions through a combination of a plurality of solenoid valves, water pumps, radiators, and the like. When the technical scheme is used, the technical scheme has the following defects: The system has a complex structure and high cost, and the traditional architecture needs a large number of independent valves, pipelines, sensors and controllers to realize the on-off and switching of the fluid of different loops, so that the system has high hardware cost, complex assembly, large occupied space and more potential leakage and fault points. The energy utilization rate is low, the waste is serious, and each loop is relatively independent, so that the heat cannot be flexibly and efficiently allocated in the whole system. For example, a large amount of waste heat generated by the motor and engine during operation is directly vented to the atmosphere through the radiator under most conditions, resulting in significant waste of energy. The low-temperature performance is poor, and the cruising is influenced, namely, under the low-temperature environment in winter, a large amount of electric energy is consumed for battery heat preservation and cabin heating (mainly through a PTC heater), the existing system is insufficient in waste heat recycling, so that the energy consumption in winter is increased rapidly, and the cruising mileage is seriously reduced. The system has single functional mode and poor adaptability, and the simple serial-parallel structure limits the achievable operation modes of the system, is difficult to cope with complex environment temperature and driving working conditions, and cannot realize efficient compound modes such as 'power system waste heat is used as a heat pump heat source'. The traditional design scheme is relatively fixed, and gradual improvement of functions is difficult to realize by increasing and decreasing a small number of components on the same basic framework, so that the platform development and modularized development are not facilitated, and the requirements of vehicle types with different cost and performance positioning cannot be met. Therefore, the nine-way valve-based step-by-step enhanced pure electric vehicle integrated thermal management system is designed and used for providing another technical scheme for the technical problems. Disclosure of Invention Based on this, it is necessary to provide a step-by-step enhancement type integrated thermal management system for a pure electric vehicle based on a nine-way valve for solving the technical problems set forth in the background art. In order to solve the technical problems, the invention adopts the following technical scheme: an integrated thermal management system of a step-by-step enhanced pure electric vehicle based on a nine-way valve, comprising: the nine-way valve is used as a core hub for integrating a thermal management system; The passenger cabin heating loop is connected with the system through a cooling liquid flow path through a port b and a port h of the nine-way valve; a battery thermal management loop, wherein a cooling liquid flow path is connected into a system through g port and a port of the nine-way valve; the cooling loop of the electric drive system is connected with the system through an e port and an f port of the nine-way valve; the refrigerant loop exchanges heat with the passenger cabin heating loop and the battery thermal management loop through a water-cooling condenser and a water-cooling evaporator respectively; The control module is used for controlling the port communication state of the nine-way valve according to the working condition instruction so as to switch the working modes of different loops; And/or, a composite framework of cold source relay cooling and double heat source enhanced heat pump is constructed by additionally arranging a four-way valve between the cooling circuit of the electric dri