Battery Pack Waterproof Seal Structure to Prevent End Misalignment
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Solution Overview
Problem
Existing battery pack designs face misalignment issues when connecting end sides due to insufficient joining of end surfaces, leading to potential misalignment under external forces, which compromises the waterproof integrity.
Innovation Solution
A battery pack design featuring a waterproof member with an annular shape, where adjacent recessed and projecting portions on each end side mesh with each other, enhancing the connection stability and preventing misalignment, and incorporating a solid structure with position fixing projecting portions to secure the meshing configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If end surfaces of both end portions of the packing material are configured to butt against each other, then the structure is simple, but joining of the end surfaces is insufficient leading to misalignment under external force
Solution Approach 1:
The packing material is segmented into multiple engagement portions (first engagement portion, second engagement portion, third engagement portion) along its length. Each engagement portion has alternating protruding and recessed parts that interlock with adjacent sections, distributing the joining function across multiple segments rather than relying on a single butt joint. This segmentation provides multiple contact points that collectively resist external forces and prevent misalignment.
Solution Approach 2:
Different regions of the packing material are given different local structures: protruding parts at some locations and recessed parts at others. The engagement portions have locally optimized geometries with protrusions and recessions specifically positioned to create interlocking joints. This local quality variation enables strong joining at critical interfaces while maintaining overall structural simplicity.
2Reliability
If a waterproof member with meshing recessed and projecting portions is used, then misalignment is prevented, but the device complexity increases
Solution Approach 1:
The waterproof function and the alignment/joining function are merged into a single integrated waterproof member. The member simultaneously provides waterproof sealing through its continuous structure and alignment through its meshing protruding and recessed portions. This merging eliminates the need for separate alignment fixtures or additional sealing components, achieving reliable alignment without proportionally increasing overall device complexity.
Solution Approach 2:
The waterproof member serves multiple functions: it provides waterproof sealing, prevents misalignment through meshing engagement portions, and structurally connects different parts of the battery pack. This multi-functionality reduces the total number of components needed while achieving the alignment precision goal.
Data Source
AI summary
A battery pack is provided and includes a battery module housed in a housing space defined by a housing body and a lid, and a waterproof member is interposed between the housing body and the lid. The waterproof member has an annular shape formed by connecting a one end side and an another end side of a linear shape to each other. A first recessed portion and a first projecting portion are provided so as to be adjacent to each other on the one end side. A second recessed portion and a second projecting portion are provided so as to be adjacent to each other on the another end side. The first recessed portion and the second projecting portion mesh with each other. The second recessed portion and the first projecting portion mesh with each other.