Battery Case Venting Layout to Suppress Heat After Gas Discharge
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Solution Overview
Problem
Existing power storage devices promote heat generation when air from a discharged pressure relief valve contacts adjacent battery cells, leading to potential thermal issues.
Innovation Solution
A power storage device design with a pressure relief valve on the top wall and a breathable membrane on the bottom and peripheral walls below it, which deposits debris from discharged gas, preventing air inflow and suppressing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air flows into the case through the breathable membrane to adjust internal pressure after gas discharge, then pressure balance is restored, but heat generation is promoted in battery cells
Solution Approach 1:
The patent extracts the harmful function of the breathable membrane (allowing air inflow that causes heat generation) while preserving its useful function (pressure adjustment). This is achieved by removing or blocking the membrane's air-permeable property after it has served its pressure-balancing purpose, thereby eliminating the source of heat-generating air flow.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the breathable membrane in a state that allows pressure adjustment, then subsequently blocking it to prevent harmful air inflow. The blocking action is prepared in advance or triggered automatically after pressure normalization, preventing the sequence of air inflow followed by heat generation in other battery cells.
2Reliability
If the breathable membrane is positioned to allow air inflow for pressure adjustment, then internal pressure is normalized, but thermal propagation risk increases
Solution Approach 1:
The patent converts the potentially harmful air flow through the breathable membrane into a beneficial one-time pressure adjustment mechanism. By designing the membrane to be blocked or closed after initial pressure normalization, the same structure that enables pressure adjustment is transformed into a barrier that prevents thermal propagation, turning a double-edged feature into a controlled beneficial function.
Solution Approach 2:
The patent applies dynamics by making the breathable membrane's permeability property changeable - it transitions from a permeable state (allowing air flow for pressure adjustment) to a blocked state (preventing air flow and thermal propagation). This dynamic behavior allows the membrane to adapt its function based on the operational phase: pressure recovery versus thermal protection.
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
Effectively suppresses heat generation in the device by blocking air inflow through the breathable membrane, using debris deposition to prevent thermal propagation.
Implementation Method 1
a breathable membrane provided to the case to regulate the pressure inside the case by allowing passage of a gaseous body between the inside of the case and the outside of the case
Implementation Method 2
a pressure relief valve provided to the case to release pressure in the case
Data Source
AI summary
A power storage device includes a plurality of power storage stacks, a case, a pressure relief valve, and a breathable membrane. The case includes a bottom wall, a peripheral wall, and a top wall. The pressure relief valve is provided on the top wall. The breathable membrane is provided at a part of the bottom wall and the peripheral wall located below the pressure relief valve.