Secondary Battery Electrolyte Injection Hole Sealing Plug
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Solution Overview
Problem
The existing methods for sealing the electrolyte injection hole in secondary batteries often result in electrolyte leakage due to inadequate sealing, leading to increased manufacturing costs and potential electrical issues from excessive current flow.
Innovation Solution
A secondary battery design featuring a cap assembly with a first extension groove and a sealing member coated in a rubber material, combined with a plug, which forms a tight seal by using a second extension groove and chamfered edges to prevent electrolyte leakage, and a method involving a spray needle for applying the sealing solvent and inserting a ball to adhere the plug.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to seal the electrolyte injection hole, then sealing is achieved, but excessive current flows causing the ball and surrounding area to melt and form cracks
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a mechanical pressing system. A pressing device applies controlled mechanical force to press the ball into the electrolyte injection hole, sealing it without generating excessive heat that would cause melting and cracking. This substitution eliminates the harmful thermal effects while achieving reliable sealing.
2Reliability
If resin coating is applied to the pressed ball to prevent leakage, then sealing improvement is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the resin coating process from the manufacturing sequence. By optimizing the mechanical pressing parameters (force, duration, ball material properties), the invention achieves reliable sealing without requiring the additional resin coating step, thereby reducing manufacturing complexity and cost while maintaining sealing reliability.
Solution Approach 2:
The patent uses a simple, inexpensive ball made from suitable material (such as aluminum or plastic) that can be directly pressed into the injection hole. This disposable-like approach replaces the need for expensive resin coating materials and the associated coating equipment, achieving cost-effective sealing.
3Ease of manufacture
If force is applied to insert the ball into the electrolyte injection hole, then sealing is attempted, but inadequate sealing occurs leading to electrolyte leakage
Solution Approach 1:
The patent systematically changes and optimizes critical parameters of the pressing process including pressing force magnitude, pressing duration, ball material properties (hardness, elasticity), and ball diameter relative to the injection hole. By carefully controlling these parameters, the invention achieves reliable sealing while maintaining process simplicity and avoiding the need for complex additional steps.
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
This solution effectively prevents electrolyte leakage and reduces manufacturing costs by ensuring a secure seal without the need for additional resin coating processes, enhancing the reliability and efficiency of the battery sealing process.
Implementation Method 1
a first extension groove having a greater diameter than that of the electrolyte injection hole, the first extension groove being arranged in an entering portion of the electrolyte injection hole and having at least one hollow portion arranged on the surface of the first extension groove
Implementation Method 2
A secondary battery design featuring a cap assembly with a first extension groove and a sealing member coated in a rubber material, combined with a plug, which forms a tight seal
Data Source
AI summary
A secondary battery includes an electrode assembly including: a winding having a positive electrode plate, a negative electrodes plate, and stacked together with a separator interposed between the positive and negative electrode plate; a can having an opening portion to receive the electrode assembly; a cap assembly including a cap plate to close the opening portion of the can, the cap plate having an electrolyte injection hole arranged therein; and a first extension groove having a greater diameter than that of the electrolyte injection hole, the first extension groove being arranged in an entering portion of the electrolyte injection hole and having at least one hollow portion arranged on the surface of the first extension groove.