Battery Pack Sealing Member Design for Waterproofing
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Solution Overview
Problem
Conventional battery packs face challenges in maintaining power efficiency and stability due to the penetration of external contaminants like dust and water, which can affect the performance and lifespan of high-power battery modules used in devices such as electric vehicles.
Innovation Solution
A battery pack design incorporating a sealing member made of fluorine-containing rubber or other materials, interposed between the battery module and the housing, along with a reinforcing member, to create a waterproof and dustproof seal, and using fastening members like bolts or adhesive to securely connect the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional battery module structure is used without a sealing member, then the device complexity is reduced, but waterproof and dustproof functions deteriorate allowing external contaminants to penetrate
Solution Approach 1:
A sealing member is introduced as an intermediary component between the battery module and the housing. This sealing member includes a sealing body with a sealing surface that contacts both the battery module and the housing, creating an effective seal without requiring complex integrated sealing structures. The sealing member acts as a mediator that achieves waterproof and dustproof functions while maintaining relatively simple overall structure.
2Strength
If fastening members are used to connect the battery module and housing, then connection strength is improved, but the sealability may be compromised at the fastening locations
Solution Approach 1:
The sealing member is positioned to overlap with the fastening members, acting as an intermediary that maintains the seal at the fastening locations. The sealing body extends to cover the areas where fastening members penetrate the housing, preventing contaminants from entering through the fastening holes while allowing the fastening members to maintain strong mechanical connection.
Solution Approach 2:
The sealing member is nested within the housing structure, with the sealing body positioned inside the housing and overlapping the fastening members. This nested arrangement allows the sealing function to be integrated within the existing fastening structure without interfering with the mechanical connection strength.
3Reliability
If multiple fastening portions are used to secure the battery module, then connection reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The sealing member is divided into multiple sealing portions, each corresponding to a different fastening location. The sealing body includes first, second, and third sealing portions that respectively overlap with different fastening members. This segmentation allows each sealing portion to be independently positioned and secured, simplifying the manufacturing process while maintaining connection reliability at multiple locations.
Data Source
AI summary
A battery pack includes a battery module including a plurality of battery cells electrically connected to each other, a housing surrounding the battery module, and a sealing member interposed between the battery module and the housing.