Vehicle thermal management system

By using a two-stage heat pump mode vehicle thermal management system, which combines heat exchange between the refrigerant and cooling water circuits, the problems of low heating efficiency in the vehicle interior and inadequate battery cooling in electric vehicles in cold environments are solved, achieving efficient battery cooling and vehicle interior heating.

CN117545644BActive Publication Date: 2026-06-05TOYOTA INDUSTRIES CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TOYOTA INDUSTRIES CORP
Filing Date
2022-03-11
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing electric vehicles suffer from low heating efficiency in the vehicle interior and inadequate battery cooling in cold environments, especially when the outside temperature is low, making it difficult to effectively cool the battery and heat the vehicle interior.

Method used

The vehicle thermal management system adopts a two-stage heat pump mode. Through the combination of a first refrigerant circuit, a cooling water circuit, and a second refrigerant circuit, it utilizes the heat exchange between the refrigerant and the cooling water to achieve heating of the vehicle interior and cooling of the battery and electrical components. This includes the design of the first refrigerant/cooling water heat exchanger and the second refrigerant/cooling water heat exchanger, and the control unit controls the operating mode of each circuit.

Benefits of technology

It effectively heats the vehicle interior in cold environments and properly cools the onboard battery and electrical components, improving the vehicle's energy efficiency and range.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN117545644B_ABST
    Figure CN117545644B_ABST
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Abstract

The present application has: a first refrigerant circuit (1) for air conditioning in a vehicle cabin, which has a first refrigerant / inside air heat exchanger (12) that exchanges heat between a first refrigerant and inside air; a cooling water circuit (2) that cools an electrical component (23) using cooling water; a second refrigerant circuit (3) for battery temperature adjustment, which has a second refrigerant / outside air heat exchanger (39) that exchanges heat between a second refrigerant and outside air; a first refrigerant / cooling water heat exchanger (4) that exchanges heat between the first refrigerant and the cooling water; and a second refrigerant / cooling water heat exchanger (5) that exchanges heat between the second refrigerant and the cooling water. In a two-stage heat pump mode, the second refrigerant of the second refrigerant circuit (3) absorbs heat from the outside air in the second refrigerant / outside air heat exchanger (39) and releases heat to the cooling water of the cooling water circuit (2) in the second refrigerant / cooling water heat exchanger (5), and the first refrigerant of the first refrigerant circuit (1) absorbs heat from the cooling water of the cooling water circuit (2) in the first refrigerant / cooling water heat exchanger (4) and releases heat to the inside air in the first refrigerant / inside air heat exchanger (12).
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