EP-4737185-A1 - THERMAL MANAGEMENT SYSTEM AND THERMAL MANAGEMENT METHOD OF ELECTRIC MOTORCYCLE

EP4737185A1EP 4737185 A1EP4737185 A1EP 4737185A1EP-4737185-A1

Abstract

The present invention is applicable to the field of battery packs of electric motorcycles, and provides a thermal management system and a thermal management method for electric motorcycles. A first liquid flow loop flows through a battery module in a battery housing and is connected to the battery housing, a second liquid flow loop includes a liquid flow channel of the battery housing and a liquid flow channel of a motor housing, a thermal management module has a signal connection with a first control valve in the first liquid flow loop and a second control valve in the second liquid flow loop, respectively, so as to control a liquid flow state of the first liquid flow loop, a liquid flow state of the liquid flow channel of the battery housing and a liquid flow state of the liquid flow channel of the motor housing. During a driving process, the liquid flow channel of the motor housing dissipates heat from the motor, and the liquid in the first liquid flow loop transfers the heat to the battery housing, so as to take heat away from the battery housing through airflow generated during the driving. During a charging process, the liquid in the liquid flow channel of the battery housing takes heat away from the battery housing. The electric motorcycle is enabled to have a better heat dissipation effect during the driving process and the charging process.

Inventors

LIU, Xiaofen

Assignees

Shenzhen Kaixiang Intelligent Technology Co., Ltd

Dates

Publication Date: 20260506
Application Date: 20241223

Claims (15)

A thermal management system of an electric motorcycle, characterized in that , the thermal management system comprises: a battery housing configured to accommodate at least one battery module; a motor housing configured to accommodate a motor; a first liquid flow loop, wherein the first liquid flow loop flows through the battery module, and a part of structures in the first liquid flow loop are connected to the battery housing, a first control valve is provided in the first liquid flow loop, and the first control valve is configured to control a liquid flow state of the first liquid flow loop; a second liquid flow loop comprising a liquid flow channel of the battery housing and a liquid flow channel of the motor housing, wherein the liquid flow channel of the battery housing is formed in the battery housing, the liquid flow channel of the motor housing is formed in the motor housing; a second control valve is provided in the liquid flow channel of the battery housing, and the second control valve is connected to the liquid flow channel of the battery housing and the liquid flow channel of the motor housing, respectively; the second control valve is configured to control a liquid flow state of the liquid flow channel of the battery housing and a liquid flow state of the liquid flow channel of the motor housing, respectively; and a thermal management module having a signal connection with the first control valve and the second control valve, respectively, wherein the thermal management module may control the first control valve so as to control the liquid flow state of the first liquid flow loop, the thermal management module is further configured to control the second control valve so as to control the liquid flow state of the liquid flow channel of the battery housing and a liquid flow state of the liquid flow channel of the motor housing, respectively.
The thermal management system according to claim 1, wherein the first liquid flow loop comprises a liquid flow channel of the battery module and a semiconductor component, the liquid flow channel of the battery module is formed in the battery module, the semiconductor component is connected with the battery housing, the semiconductor component is connected with the liquid flow channel of the battery module, the first control valve is connected with the liquid flow channel of the battery module or the semiconductor component, the semiconductor component has a signal connection with the thermal management module, and the thermal management module is configured to control the semiconductor component to heat or cool the liquid flow channel of the battery module.
The thermal management system according to claim 2, wherein the battery housing has a mounting area, one side of the mounting area is connected to the semiconductor component, and the liquid flow channel of the battery housing is formed on an opposite side of the mounting area.
The thermal management system according to claim 3, wherein a plurality of spoiler columns are arranged at intervals in the liquid flow channel of the battery housing.
The thermal management system according to claim 4, wherein the plurality of spoiler columns are arranged on a first inner wall of the liquid flow channel of the battery housing, and a projection shape of the plurality of spoiler columns on the first inner wall is a water drop shape.
The thermal management system according to claim 4, wherein the semiconductor component is mounted on an inner surface of the mounting area, an outer surface of the mounting area is covered with a cover body, the cover body and the outer surface of the mounting area are enclosed to form the liquid flow channel of the battery housing, and the plurality of the spoiler columns are arranged at intervals on the outer surface of the mounting area.
The thermal management system according to any one of claims 3-6, wherein each of multiple side walls of the battery housing is provided with the mounting area, one side of each mounting area is connected to the semiconductor component, and the liquid flow channel of the battery housing is formed on an opposite side of the mounting area.
The thermal management system according to any one of claims 2-6, wherein the battery module comprises a liquid cooled module, a battery cell holder and a battery cell, the liquid cooled module and the battery cell holder are enclosed to form an accommodation space, a plurality of the battery cells are accommodated in the accommodation space, and the liquid cooled module is provided with the liquid flow channel of the battery module.
The thermal management system according to claim 8, wherein the accommodation space is filled with a thermal conducting adhesive, and the thermal conducting adhesive is provided between the battery cell and the liquid cooled module and between two adjacent battery cells.
The thermal management system according to claim 9, wherein a plurality of first heat pipes are arranged at intervals in the accommodation space, each of the plurality of first heat pipes comprises two first heat absorption ends and a first heat releasing end, one of the two first heat absorption ends is arranged in a gap between two adjacent battery cells, the first heat releasing end of each of the plurality of first heat pipes is connected to the liquid cooled module, and the plurality of first heat pipes are buried in the thermal conducting adhesive.
The thermal management system according to claim 10, wherein the first heat pipe is a U-shaped pipe, the U-shaped pipe is provided with two extension parts and one middle part between the two extension parts, the middle part is connected to the two extension parts, respectively, the two extension parts are the two first heat absorption ends, and the middle part is the first heat releasing end.
The thermal management system according to claim 8, wherein a plurality of the battery modules are accommodated in the battery housing, liquid flow channels of the battery modules in the liquid cooled modules of the plurality of battery modules are connected in parallel, and the plurality of liquid flow channels of the battery modules are connected with the semiconductor component.
The thermal management system according to any one of claims 2-6, wherein the first liquid flow loop further comprises a first water tank cooling module, a water outlet of the first water tank cooling module is connected to a first water inlet of the first control valve, a water outlet of the first control valve is connected to a water inlet of the semiconductor component, a water outlet of the semiconductor component is connected to a water inlet of the liquid flow channel of the battery module, and a water outlet of the liquid flow channel of the battery module is respectively connected to a water inlet of the first water tank cooling module and a second water inlet of the first control valve.
The thermal management system according to any one of claims 1-6, wherein the second liquid flow loop further comprises a second water tank cooling module, a water outlet of the second water tank cooling module is connected to a water inlet of the second control valve, a first water outlet of the second control valve is connected to a water inlet of the liquid flow channel of the motor housing, a second water outlet of the second control valve is connected to the water inlet of the liquid flow channel of the battery housing, and water outlets of the liquid flow channel of the motor housing and the liquid flow channel of the battery housing are connected to a water inlet of the second water tank cooling module.
A thermal management method of an electric motorcycle, wherein the thermal management method is applicable to the thermal management system of the electric motorcycle according to any one of claims 1-14 and comprises: determining an operating condition of the thermal management system, wherein the operating condition comprises a charging condition and a discharge condition; obtaining a temperature value of the battery module, and comparing the temperature value of the battery module with a preset charging temperature threshold or a preset discharge temperature threshold; in the charging condition of the thermal management system, controlling the first control valve through the thermal management module so as to allow liquid in the first liquid flow loop to flow therethrough, or controlling the first control valve and the second control valve respectively through the thermal management module so as to allow the liquid in the first liquid flow loop to flow therethrough and allow liquid in the liquid flow channel of the battery housing to flow therethrough, according to a result of comparison between a temperature value of the battery module and the preset charging temperature threshold; and in the discharge condition of the thermal management system, controlling the first control valve and the second control valve respectively through the thermal management module so as to allow the liquid in the first liquid flow loop to flow therethrough and allow the liquid in the liquid flow channel of the motor housing to flow therethrough, according to a result of comparison between the temperature value of the battery module and the preset discharge temperature threshold.

Description

TECHNICAL FIELD The present invention relates to the technical field of battery packs of electric motorcycles, and more particularly, to a thermal management system and a thermal management method of an electric motorcycle. BACKGROUND With the intensification of the global energy crisis and the increasing severity of environmental pollution problems, electric motorcycles, as clean and efficient transportation tools, have attracted widespread attention and are widely applied. In a thermal management system of an electric motorcycle, heat dissipation efficiencies of a battery pack and a motor are key performance indicators that affect a safety, an endurance and a service life of the electric motorcycle. Currently, most electric motorcycles mainly rely on natural cooling or air cooling to dissipate heat from battery packs and motors, however, a heat dissipation speed of natural cooling is extremely slow. Although the heat dissipation speed of air cooling is faster than that of natural cooling, currently, in order to improve the endurance and meet the needs of high-rate discharge, electric motorcycles have increased the number of battery cells, thereby sharply compressing a limited space of the battery pack of the electric motorcycle for active heat dissipation. Thus, the air cooling method cannot meet the heat dissipation requirement of the battery pack. Moreover, the air cooling method is only applicable during the driving process of the electric motorcycle. During the charging process of the electric motorcycle, since the electric motorcycle is in a stationary state, the heat of the battery pack cannot be taken away by airflow, the heat cannot be dissipated in time, battery failure is prone to occur, and the service life of the battery pack of the electric motorcycle may be shortened. Thermal runaway of the battery cell may also be caused, and a serious safety accident may occur accordingly. Therefore, there is an urgent need for a heat dissipation solution that can achieve excellent heat dissipation effect during the driving process and the charging processes of the electric motorcycle. SUMMARY An objective of the embodiments of the present invention is providing a thermal management system and a thermal management method, which aim at solving a technical problem in the related art that a whole electric motorcycle has a bad heat dissipation effect due to the fact that a battery pack and a motor of the electric motorcycle has bad heat dissipation effects during a driving process and a charging process. In order to achieve the above objective, the technical solutions adopted by the present invention is: providing a thermal management system of an electric motorcycle, the thermal management system includes: a battery housing configured to accommodate at least one battery module;a motor housing configured to accommodate a motor;a first liquid flow loop, where the first liquid flow loop flows through the battery module, and a part of structures in the first liquid flow loop are connected to the battery housing, a first control valve is provided in the first liquid flow loop, and the first control valve is configured to control a liquid flow state of the first liquid flow loop;a second liquid flow loop including a liquid flow channel of the battery housing and a liquid flow channel of the motor housing, where the liquid flow channel of the battery housing is formed in the battery housing, the liquid flow channel of the motor housing is formed in the motor housing; a second control valve is provided in the liquid flow channel of the battery housing, and the second control valve is connected to the liquid flow channel of the battery housing and the liquid flow channel of the motor housing, respectively, the second control valve is configured to control a liquid flow state of the liquid flow channel of the battery housing and the liquid flow channel of the motor housing, respectively; anda thermal management module having a signal connection with the first control valve and the second control valve, respectively. The thermal management module may control the first control valve so as to control the liquid flow state of the first liquid flow loop. The thermal management module may also control the second control valve so as to control the liquid flow state of the liquid flow channel of the battery housing and the liquid flow state of the liquid flow channel of the motor housing, respectively. The thermal management system of the electric motorcycle provided in the present invention has the following beneficial effects: as compared to the related art, in the thermal management system of the electric motorcycle of the present invention, during the driving process of the electric motorcycle, the thermal management module controls the first control valve so as to enable the liquid in the first liquid flow loop to flow. Thus, the heat of the battery module is transferred to the battery housing through the liquid in the fi