Cylindrical Battery Pack Lead Plate Structure for Gas Redirection
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Solution Overview
Problem
In a battery pack with multiple secondary batteries, gas ejected from a cleaved cleavage valve of one battery can increase the internal pressure of adjacent batteries, potentially causing further safety issues and instability.
Innovation Solution
The battery pack design includes lead plates with strategically arranged first and second through holes and wall portions that guide and redirect gas and sparks away from one secondary battery to prevent them from being blown to or hitting another, using a configuration of cylindrical secondary batteries connected in parallel with press-formed metal lead plates featuring specific hole and recess geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If secondary batteries are arranged in parallel in a battery pack, then electrical connection efficiency is improved, but gas ejected from one battery can blow to adjacent batteries causing safety issues
Solution Approach 1:
The lead plate acts as an intermediary component between adjacent secondary batteries. It includes a through hole positioned between the batteries and a wall portion that extends from the plate surface toward the cleavage valve, creating a physical barrier that intercepts and redirects gas flow before it can reach adjacent batteries, thus protecting them from harmful gas exposure while maintaining electrical connection functionality
Solution Approach 2:
The harmful gas flow path is extracted and redirected through the through hole in the lead plate. By providing this dedicated escape route, the gas is channeled away from adjacent batteries in a controlled manner, separating the gas ejection function from the harmful effect on neighboring cells
Data Source
AI summary
A battery pack is provided and includes two or more secondary batteries having a cylindrical shape and arranged in parallel, and a first lead plate that electrically connects two or more of the secondary batteries. The first lead plate includes a first through hole, and a first wall portion provided on a plate surface on the opposite side to a plate surface having a connection surface connected to a terminal of the secondary battery, and the first wall portion has a first wall surface continuous with an inner peripheral surface of the first through hole.