Battery Case Venting Structure for Pressure-Relief Reliability
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Solution Overview
Problem
As secondary batteries increase in capacity, they become larger in size, posing challenges for reliability, particularly in terms of pressure management and gas discharge.
Innovation Solution
The secondary battery design incorporates a case with a gas-discharge valve that fractures when internal pressure exceeds a predetermined value, along with a unique arrangement of sealing plates, walls, and an insulating sheet to enhance reliability and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery capacity is increased to achieve higher energy storage, then the battery size increases, but the reliability deteriorates due to pressure management and gas discharge issues
Solution Approach 1:
The case is divided into multiple walls (first walls and second walls) with different areas, creating segmented pressure management zones. The gas-discharge valve is specifically positioned on one of the second walls, separating the gas discharge function from the main pressure-bearing structures, thereby improving reliability while maintaining high capacity.
2Reliability
If a gas-discharge valve is added to manage pressure, then the reliability improves, but the device complexity increases
Solution Approach 1:
The gas-discharge valve is integrated into the case structure by forming it as a thin portion or groove portion directly on one of the second walls, merging the valve function with the existing case geometry rather than adding a separate complex valve mechanism, thus improving pressure management while minimizing structural complexity.
3Stress or pressure
If the case structure is optimized with different wall areas, then the pressure distribution improves, but the manufacturing precision requirements increase
Solution Approach 1:
The case employs an asymmetric structure where the first walls have larger areas than the second walls, creating an optimized pressure distribution pattern. This asymmetric design is straightforward to manufacture by forming the case with predetermined wall areas, avoiding the need for high-precision manufacturing while achieving improved pressure management.
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
This design achieves a high-capacity secondary battery with improved reliability by effectively managing pressure and ensuring stable gas discharge, facilitating easier mounting on vehicles.
Implementation Method 1
one of the pair of second walls is provided with a gas-discharge valve that is fractured when pressure in the case becomes equal to or more than a predetermined value
Data Source
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AI summary
A case main body (110) includes a pair of first walls (111) and a pair of second walls (112), the pair of first walls (111) facing each other in a second direction orthogonal to a first direction, the pair of second walls (112) facing each other in a third direction orthogonal to the first direction and the second direction, an area of each of the pair of first walls (111) being larger than an area of each of the pair of second walls (112), one of the pair of second walls (112) is provided with a gas-discharge valve (150) that is fractured when pressure in the case (100) becomes equal to or more than a predetermined value, and the other of the pair of second walls (112) is provided with a joining portion (115) extending in the first direction.