Battery Cell Electrode Terminal Dual Sealing Against Electrolyte Leakage
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Solution Overview
Problem
The sealing effect on the liquid injection hole of existing battery cells is inadequate, leading to potential electrolyte leakage and damage to the sealing member.
Innovation Solution
A dual-sealing mechanism is implemented, where a first sealing member is partially disposed in a recessed portion of the electrode terminal and secured by a second sealing member, which presses and holds the first sealing member to enhance the sealing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sealing member is used to seal the liquid injection hole, then the structure is simple, but the sealing effect is insufficient and electrolyte leakage risk increases
Solution Approach 1:
The sealing member is divided into two distinct parts: a first sealing member that seals the liquid injection hole, and a second sealing member that seals the recessed portion. This segmentation allows each sealing member to focus on a specific sealing task, improving the overall sealing effect while maintaining reasonable structural complexity
Solution Approach 2:
The first sealing member is disposed within the recessed portion of the electrode terminal, and the second sealing member is disposed within the housing to seal the recessed portion. This nested arrangement creates multiple sealing barriers, where the first sealing member seals the liquid injection hole and the second sealing member seals the recessed portion containing the first sealing member, thereby enhancing sealing reliability
2Reliability
If the sealing member is pressed tightly to improve sealing, then sealing effect improves, but the sealing member may deform or damage
Solution Approach 1:
By dividing the sealing function into two separate sealing members, each operating in its own designated space, the pressing force required for effective sealing is distributed. The first sealing member is pressed within the recessed portion, while the second sealing member is pressed within the housing, preventing excessive localized stress that could cause deformation or damage
Solution Approach 2:
The recessed portion acts as a cushioning structure that absorbs and distributes the pressing force applied to the first sealing member. This pre-designed recessed space prevents excessive stress concentration, protecting the sealing member from deformation or damage while maintaining effective sealing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dual-sealing mechanism effectively reduces the risk of electrolyte leakage and prevents the first sealing member from slipping out, thereby improving the sealing integrity of the liquid injection hole.
Implementation Method 1
The first sealing member includes a body portion, where the body portion is disposed in the first recessed portion and covers the liquid injection hole, and the second sealing member surrounds the liquid injection hole to press and hold the body portion against the bottom of the first recessed portion
Data Source
AI summary
A battery cell includes a housing, an electrode terminal, a first sealing member, and a second sealing member. The housing includes a wall portion, the wall portion having an outlet hole. The electrode terminal is inserted into the outlet hole along the axial direction of the electrode terminal, the electrode terminal having a first recessed portion and a liquid injection hole connected along the axial direction, and the liquid injection hole being located at the bottom of the first recessed portion. In the radial direction of the electrode terminal, the radial dimension of the liquid injection hole is smaller than the radial dimension of the first recessed portion. The first recessed portion communicates with the interior of the housing via the liquid injection hole. The first sealing member is at least partially disposed within the first recessed portion and is configured to seal the liquid injection hole.