Electric Motorcycle Liquid Cooling for Battery and Motor Heat
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Solution Overview
Problem
Existing electric motorcycles suffer from inadequate heat dissipation during both driving and charging processes, leading to potential battery failure and safety risks due to slow natural cooling and limitations of air cooling methods.
Innovation Solution
A thermal management system with a liquid flow loop and control valves for the battery and motor housings, controlled by a thermal management controller, to manage heat dissipation during driving and charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If air cooling method is used to dissipate heat from battery pack, then heat dissipation speed is improved compared to natural cooling, but heat dissipation requirement cannot be met when number of battery cells is increased
Solution Approach 1:
The patent applies liquid cooling technology by introducing a cooling liquid circulation system with cooling channels directly contacting the battery pack. The cooling liquid absorbs heat from the battery pack through convection and conduction, achieving high-efficiency heat dissipation that can meet the thermal management requirements of high-capacity battery packs with increased cell numbers.
Solution Approach 2:
The cooling liquid acts as an intermediary medium between the battery pack and the external environment. It transfers heat from the battery pack through the cooling channels to the heat exchanger, enabling efficient heat removal without direct contact between the battery and air, thus solving the limitation of air cooling capacity.
2Speed
If air cooling method is used, then heat dissipation during driving process is improved, but heat dissipation during charging process cannot be achieved since electric motorcycle is in stationary state
Solution Approach 1:
The liquid cooling system is designed to provide universal heat dissipation capability for both driving and charging operations. The circulation pump ensures continuous liquid flow through the cooling channels regardless of vehicle motion state, enabling effective heat removal during stationary charging when air cooling is unavailable.
Solution Approach 2:
The thermal management system operates autonomously based on temperature sensor feedback. The control unit activates the circulation pump when cooling is needed, and the system self-regulates the cooling liquid flow to maintain battery pack temperature within safe operating range during both dynamic and static conditions.
3Device complexity
If natural cooling is used, then system complexity is reduced, but heat dissipation speed is extremely slow leading to battery failure risks
Solution Approach 1:
The patent implements a liquid cooling system with cooling channels, circulation pump, and heat exchanger that actively removes heat from the battery pack. This hydraulic cooling approach provides rapid heat dissipation capability while maintaining relatively simple system structure suitable for electric motorcycle applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances heat dissipation efficiency for both battery modules and motors, improving safety and extending the service life of the electric motorcycle.
Implementation Method 1
a first liquid flow loop, where the first liquid flow loop flows through the battery module
Implementation Method 2
the heat of the battery module is transferred to the battery housing through the liquid in the first liquid flow loop
Implementation Method 3
Since airflow passes through the battery housing during the driving process of the electric motorcycle, the heat on the battery housing is taken away by the airflow
Implementation Method 4
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
Data Source
AI summary
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 controller 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. The electric motorcycle is enabled to have a better heat dissipation effect during the driving process and the charging process.