Battery Pack Sealing Sheet with Deformation Dividing Parts
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Solution Overview
Problem
Existing battery packs face issues with cooling air leakage from the open end of the casing, leading to deteriorated cooling performance, and require improvements in manufacturing ease, downsizing, and resource efficiency.
Innovation Solution
A battery pack design incorporating a battery holding member, bus bars, and a sealing sheet member with deformation dividing parts to prevent gas leakage and enhance sealing, featuring bus bar holding members with projections and perforations to facilitate assembly and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the other end side of the casing is left open for assembly access, then ease of manufacture is improved, but cooling air leaks from the casing leading to deteriorated cooling performance
Solution Approach 1:
The patent employs a sealing sheet member made of flexible material that can be easily installed to seal the open end of the casing. This thin film structure prevents cooling air leakage while maintaining ease of assembly, resolving the contradiction between manufacturing accessibility and cooling performance reliability.
2Reliability
If a rigid sealing structure is used to prevent gas leakage, then sealing reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The sealing sheet member is designed as a flexible thin film rather than a rigid complex structure. It features simple through-holes for terminals and deformation dividing parts that can be easily formed, achieving reliable sealing without increasing device complexity or manufacturing difficulty.
3Ease of manufacture
If the sealing sheet member is made as a single solid piece, then manufacturing is simplified, but distortion from compressive deformation between adjacent batteries causes poor sealing
Solution Approach 1:
The sealing sheet member is divided into multiple sealing regions by deformation dividing parts, with each region independently adapting to the shape of adjacent batteries. This segmentation prevents distortion propagation between batteries while maintaining manufacturing simplicity through a still-integrated sheet structure.
4Reliability
If deformation dividing parts are added to the sealing sheet member to suppress distortion, then sealing reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The deformation dividing parts are implemented as simple cutouts or perforations in the sealing sheet that create independent sealing zones. These can be easily formed during sheet fabrication using standard cutting or punching operations, achieving improved sealing reliability without significantly increasing manufacturing complexity.
Data Source
AI summary
A battery pack comprises: a battery holding member provided to have battery holding holes and configured to bind a plurality of batteries; a first bus bar arranged to electrically connect with terminals on the first side of the respective batteries; a second bus bar arranged to electrically connect with terminals on a second side in the axial direction of the respective batteries; a bus bar holding member configured to hold the second bus bar and constitute a wall surface on the second side of the casing; and a sealing sheet member configured to have a plurality of terminal exposing holes formed corresponding to the respective batteries and cause peripheries of the respective terminal exposing holes to come into contact with the end faces of the respective batteries, so as to prevent leakage of a gas from inside of the casing toward the second bus bar. The sealing sheet member has a deformation dividing part provided around at least part of the plurality of terminal exposing holes.