Battery Cell Terminal Fixing Structure for Seal-Induced Housing Deformation
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Solution Overview
Problem
Existing battery cell designs face reliability issues due to deformation of the housing caused by the direct application of reaction force from the sealing member, which affects the sealing integrity and overall performance.
Innovation Solution
A configuration where a fixing member connects the electrode terminal and the housing, with the sealing member sandwiched between the terminal and the fixing member, reducing the force acting on the housing and enhancing the reliability by distributing the reaction force through overlapping flanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing member directly contacts the housing to provide sealing, then sealing integrity is improved, but the housing deforms due to concentrated reaction force
Solution Approach 1:
The fixing member acts as an intermediary between the sealing member and the housing. The sealing member clamps onto the fixing member instead of directly contacting the housing, while the fixing member transfers the reaction force to the electrode terminal. This mediator distributes the force and prevents housing deformation while maintaining sealing integrity.
Solution Approach 2:
The fixing member extends in the radial direction from the housing wall, creating a new dimensional pathway for force transmission. Instead of the sealing force acting directly on the housing wall in one dimension, the force is transmitted through the radially extending fixing member to the electrode terminal, distributing the stress across multiple dimensions and preventing localized deformation.
2Ease of manufacture
If the electrode terminal and housing are directly connected, then assembly is simplified, but the housing deforms under reaction force
Solution Approach 1:
The fixing member serves as an intermediary connection element between the electrode terminal and the housing. It is radially inserted into the housing wall and connects to the electrode terminal, providing a simple yet effective connection mechanism that avoids complex assembly while preventing housing deformation through proper force distribution.
3Ease of manufacture
If the sealing member is exposed to the external environment, then assembly is easier, but the sealing member ages faster and reliability decreases
Solution Approach 1:
The sealing member is nested between the fixing member and the electrode terminal, creating a protected, enclosed positioning. This nested arrangement shields the sealing member from direct exposure to the external environment while maintaining easy assembly through the clamping action of the fixing member onto the sealing member.
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus are described. The battery cell comprises a housing, an electrode assembly, an electrode terminal, a fixing member, and a sealing member. The housing comprises a first wall, the first wall is provided with an electrode lead-out hole. The electrode assembly is accommodated in the housing. The electrode terminal is electrically connected to the electrode assembly and covers at least a portion of the electrode lead-out hole. The fixing member surrounds the electrode terminal and connects the electrode terminal and the first wall. The sealing member surrounds the electrode terminal, and at least a portion of the sealing member is sandwiched between the electrode terminal and the fixing member.