Battery Cooling Medium Jacket Design
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Solution Overview
Problem
Conventional lithium ion battery packaging fails to protect against overheating, as the polyethylene terephthalate or plastic film does not effectively manage internal pressure and can lead to contamination and fires when pressure relief valves release hot materials.
Innovation Solution
A battery design incorporating a protective jacket surrounding the battery main body with a cooling medium, such as silicone oils, that provides thermal insulation and prevents external oxygen contact, while maintaining electrical insulation and mechanical strength, and has a specific heat capacity of about 1-5 kJ kg−1K−1 to manage heat dissipation efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief valve is installed on the battery shell to release internal pressure, then safety is improved by preventing explosion, but hot materials spray out via the valve and contaminate the outer environment causing fire
Solution Approach 1:
A cooling medium is introduced as an intermediary substance between the battery main body and the protective jacket. This cooling medium absorbs heat from the battery during normal operation and forms a protective barrier that prevents hot materials from spraying out when the pressure relief valve opens, thus resolving the contradiction between safety and harmful material discharge
Solution Approach 2:
The cooling medium creates an inert thermal environment around the battery main body. By maintaining a cooler temperature zone between the battery and external environment, it prevents combustion of sprayed materials and eliminates the fire hazard associated with hot material discharge during pressure relief events
2Strength
If a polyethylene terephthalate or plastic film is used to cover the battery, then appearance and protection from abrasion are improved, but the battery cannot be protected from overheating
Solution Approach 1:
The cooling medium serves as a thermal intermediary layer between the battery main body and the protective jacket. This layer actively manages heat transfer, absorbing excess heat during charging and dissipating it safely, thereby providing overheating protection while maintaining the protective function of the outer jacket
Solution Approach 2:
The cooling medium enables dynamic control of thermal parameters by changing its thermal state in response to battery temperature. During normal operation, it maintains a temperature gradient that prevents overheating, while during abuse conditions, it can undergo phase changes or increased heat capacity utilization to absorb thermal energy
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
The solution effectively reduces the risk of overheating and prevents fires by maintaining lower surface temperatures and ensuring safety through efficient heat dissipation and containment of internal pressures, as demonstrated by a two-fold reduction in temperature increase compared to conventional batteries.
Implementation Method 1
a cooling medium disposed between the protective jacket and the battery main body
Implementation Method 2
The cooling medium has a specific heat capacity of about 1-5 kJ kg−1K−1
Data Source
AI summary
In one aspect, a battery comprises a battery main body, a protective jacket that surrounds the battery main body, and a cooling medium disposed between the protective jacket and the battery main body. In another aspect, a battery comprises a battery main body, a protective jacket that surrounds and connects to the battery main body, and a cooling medium disposed between the protective jacket and the battery main body. The cooling medium has a specific heat capacity of about 1-5 kJ kg−1K−1. In yet another aspect, a method for preparing a battery comprises providing a protective jacket, placing a battery main body in the protective jacket, and disposing a cooling medium between the protective jacket and the battery main body.