Secondary Battery Injection Inlet Blocking Member Sealing
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Solution Overview
Problem
Existing secondary battery designs face challenges in effectively sealing the electrolyte injection inlet to prevent leakage and ensure reliable electrical connections, particularly in maintaining the integrity of the electrolyte within the battery.
Innovation Solution
The design incorporates a blocking member with a specific hardness and materials like polypropylene or polyurethane, integrated with a threaded injection inlet and a stopper mechanism for secure sealing, ensuring the electrolyte is retained while allowing for easy electrolyte injection and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple injection inlet is used, then ease of manufacture is improved, but sealing reliability deteriorates leading to electrolyte leakage
Solution Approach 1:
The injection inlet is divided into multiple functional components: the inlet hole in the cap plate, the blocking member (ball) that seals the inlet, and the stopper that retains the blocking member. This segmentation allows each component to perform its specific function while maintaining overall sealing reliability without complicating the manufacturing process excessively.
Solution Approach 2:
The blocking member (ball) acts as an intermediary element between the injection inlet and the electrolyte. It provides the sealing function by physically blocking the inlet when not in use, preventing electrolyte leakage while allowing easy injection when needed. The stopper serves as another intermediary that holds the blocking member in place.
2Reliability
If a blocking member is added to seal the injection inlet, then sealing efficiency is improved, but device complexity increases
Solution Approach 1:
The blocking member is designed with specific local properties: a hardness of 40-50 HRC Rockwell C scale, and made of materials like polypropylene or polyurethane. These localized quality specifications ensure the ball can effectively seal the inlet while being retained by the stopper, providing high sealing efficiency without requiring complex overall device design.
Solution Approach 2:
The blocking member's hardness parameter is specifically controlled at 40-50 HRC Rockwell C scale. This parameter optimization allows the ball to be hard enough to seal effectively against the inlet walls while remaining soft enough to be retained by the stopper mechanism, achieving high sealing efficiency with minimal added complexity.
3Reliability
If a stopper mechanism is used to retain the blocking member, then electrolyte retention is improved, but ease of operation deteriorates
Solution Approach 1:
The stopper is pre-installed in the injection inlet with the blocking member already positioned within it. This preliminary arrangement ensures that the electrolyte retention function is automatically activated upon assembly, without requiring additional operational steps. The blocking member is preliminarily positioned to seal the inlet, and the stopper is preliminarily configured to retain it.
Solution Approach 2:
The stopper mechanism automatically retains the blocking member through its own structure (threaded engagement with the inlet and groove engagement with the ball). This self-service design maintains electrolyte retention without requiring external retention mechanisms or complex operational procedures, balancing reliability with ease of operation.
Data Source
AI summary
A secondary battery including an electrode assembly, the electrode assembly including a first electrode plate, a separator, and a second electrode plate; a collecting plate electrically connected to the electrode assembly; a case accommodating the electrode assembly and the collecting plate; a cap plate sealing the case; and an electrode terminal passing through the cap plate and electrically connected to the collecting plate, wherein the cap plate includes an injection inlet at a side thereof, the injection inlet includes a blocking member therein, and the blocking member and the injection inlet are covered with a stopper.