Battery Pack Venting Structure for High-Temperature Gas Discharge
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Solution Overview
Problem
Conventional battery packs with metal cases fail to safely discharge high-temperature, high-pressure gases without risking external flames, compromising safety.
Innovation Solution
A battery pack design incorporating a resin case integrated with a metal plate, featuring smoke discharge holes and thermal conductivity to manage and discharge high-temperature gases through a closed region, enhancing safety and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the case is made robust with a metal plate, then the flame retardant property is improved, but the safety is worsened because high-temperature gas cannot be discharged
Solution Approach 1:
The case is divided into a resin case and a metal plate that are integrated together. The resin case provides gas discharge pathways while the metal plate provides flame retardancy, segmenting the functions of protection and discharge across different materials in the case structure.
Solution Approach 2:
The case uses a composite structure integrating resin and metal plate materials. The resin portion allows gas permeability and discharge, while the metal plate portion provides flame retardant properties, combining the advantages of both materials to resolve the contradiction between safety and flame resistance.
2Strength
If the case is made robust with a metal plate, then the structural strength is improved, but the gas discharge capability is worsened
Solution Approach 1:
The case structure is segmented into resin and metal plate portions, with the resin case forming the gas discharge pathways and the metal plate providing structural reinforcement. This segmentation allows each material to perform its optimal function without compromising the other.
Solution Approach 2:
Different portions of the case have different material properties: the resin case portions are designed for gas discharge capability while the metal plate portions are designed for structural strength and flame retardancy. This local differentiation of material quality resolves the contradiction between strength and gas discharge.
3Reliability
If the case is made robust with a metal plate, then the flame retardant property is improved, but the heat dissipation is worsened
Solution Approach 1:
The integrated case structure combines resin and metal plate materials, where the resin portions facilitate heat dissipation through gas discharge pathways while the metal plate portions provide flame retardancy. The composite structure enables both heat management and fire protection functions simultaneously.
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 integrated structure efficiently absorbs and radiates thermal energy from high-pressure gases, preventing external flames and ensuring safe operation.
Implementation Method 1
metal plate 4 has a plurality of smoke discharge holes 7 in closed region 6 where heat radiation opening 5 of resin case 3 is closed
Implementation Method 2
The integrated structure efficiently absorbs and radiates thermal energy from high-pressure gases
Data Source
AI summary
A battery pack includes a plurality of batteries each including a discharge valve that opens when an internal pressure becomes higher than a set pressure, and case housing batteries. Case has an integrated structure of plastic resin case and metal plate, resin case has heat radiation opening closed by metal plate, and metal plate has a plurality of smoke discharge holes in closed region where heat radiation opening of resin case is closed.