Battery Pack FPM Sheet Layout for Uniform Fire Agent Coverage
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Solution Overview
Problem
Fire protection materials (FPM) sheets inside battery packs can inhibit secondary reactions by blocking oxygen when hydrogen and methane gases react with the fire protection agent, reducing their effectiveness in extinguishing fires.
Innovation Solution
A battery pack design with a fire protection materials (FPM) sheet installed in a sandwich structure between the battery block and case, featuring a wing portion to cover at least four surfaces, ensuring uniform spraying of the fire protection agent and effective reaction with gases generated during a fire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an FPM sheet is placed inside a battery pack, then fire protection capability is improved, but the FPM sheet may chemically react with hydrogen and methane gases, blocking oxygen and inhibiting secondary reactions
Solution Approach 1:
The FPM sheet is designed with different regional properties: a first region with through-holes for gas permeability and a second region without through-holes for fire protection. This local differentiation allows the sheet to perform both functions - protecting against fire while allowing controlled gas interaction in specific areas.
Solution Approach 2:
The FPM sheet is divided into multiple regions with distinct functions: a first region with through-holes that allows gas passage and a second region without through-holes that provides fire protection. This segmentation enables the single component to address multiple conflicting requirements simultaneously.
2Reliability
If an FPM sheet covers all surfaces of the battery block, then fire protection is maximized, but the sheet becomes difficult to install and access for maintenance
Solution Approach 1:
The FPM sheet is segmented into a first region with through-holes and a second region without through-holes, allowing it to be installed in a modular fashion while maintaining comprehensive coverage. The through-holes provide access points for gas interaction while the covered regions provide protection.
Solution Approach 2:
Different regions of the FPM sheet have different properties: the first region allows gas passage through through-holes while the second region provides complete coverage for fire protection. This local quality differentiation enables the sheet to be both protective and accessible.
3Volume of stationary object
If the FPM sheet is installed in direct contact with the battery block, then space is minimized, but uniform spraying of fire protection agent is compromised
Solution Approach 1:
The FPM sheet is pre-formed with through-holes in the first region before installation. This preliminary structuring ensures that when fire occurs and protection agent is sprayed, the agent can uniformly penetrate through the designated regions via the pre-formed holes, achieving consistent coverage without requiring post-installation adjustment.
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 design enhances fire protection by ensuring the fire protection agent effectively reacts with hydrogen and methane, blocking oxygen supply and maximizing the chances of extinguishing fires within the battery pack.
Implementation Method 1
hydrogen and a methane gas, generated during a chemical reaction with the material of the battery cell, may chemically react with the fire protection agent, thereby blocking oxygen
Implementation Method 2
chemically react with the fire protection agent, thereby blocking oxygen, and thus inhibiting a secondary reaction
Data Source
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AI summary
A battery pack provided with a fire protection materials (FPM) sheet includes a battery block including a plurality of battery cells electrically connected to one another, a battery case defining an accommodating space in which the battery block is accommodated, and a wing portion adjacent to the battery case and bent to cover at least four surfaces of the battery block.