Welded Secondary Battery Structure Without Beading or Crimping
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Solution Overview
Problem
Conventional secondary batteries have limitations in capacity and cost due to the need for a beading part and crimping part that occupy space within the battery, which can be optimized to enhance performance and reduce production time and expenses.
Innovation Solution
A secondary battery design that eliminates the beading part and crimping part by welding the cap plate directly to the electrode assembly, allowing for increased space for the electrode assembly and incorporating a safety vent notch and injection opening for electrolyte, thereby enhancing capacity and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a beading part and crimping part are used to seal the can, then the sealing reliability is improved, but the battery capacity is reduced due to occupied space
Solution Approach 1:
The invention extracts and eliminates the beading part and crimping part from the battery structure, replacing them with a welding portion that directly seals the cap plate to the can. This removal of unnecessary components frees up space previously occupied by these parts, thereby increasing battery capacity while maintaining sealing reliability through the welding connection.
Solution Approach 2:
The invention merges the sealing function previously performed by separate beading and crimping parts into an integrated welding portion. This welding portion combines the sealing and structural support functions into a single component, eliminating space waste and reducing the number of parts while maintaining or improving sealing reliability.
2Reliability
If beading and crimping processes are implemented, then the sealing function is achieved, but the production time and manufacturing cost increase
Solution Approach 1:
The invention removes the complex beading and crimping processes from the manufacturing sequence, replacing them with a single welding operation. This extraction of unnecessary process steps directly reduces production time and manufacturing complexity while achieving the same sealing function through welding.
Solution Approach 2:
The invention replaces the mechanical beading and crimping processes with a welding process. This substitution eliminates the need for complex mechanical operations, reducing production time and manufacturing cost while maintaining sealing reliability through the strong weld bond between the cap plate and can.
3Reliability
If more components (beading part, crimping part) are used for sealing, then the sealing reliability is improved, but the device complexity increases
Solution Approach 1:
The invention merges multiple sealing components (beading part, crimping part) into a single integrated welding portion. This consolidation reduces device complexity by eliminating unnecessary parts while maintaining sealing reliability through the direct weld connection between the cap plate and can, resulting in a simpler overall structure.
Solution Approach 2:
The invention extracts and removes the beading part and crimping part from the battery structure, keeping only the essential welding portion for sealing. This extraction simplifies the device structure by eliminating redundant components while preserving the critical sealing function through the welding connection.
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 design increases battery capacity by utilizing the previously occupied space for the electrode assembly, reduces production time, and lowers costs by eliminating the need for the beading and crimping processes, while ensuring safety through a vent notch for pressure release.
Implementation Method 1
a welding portion welded in contact with an upper end of the electrode assembly
Data Source
AI summary
A secondary battery includes: an electrode assembly; a can having an open upper end and accommodating the electrode assembly; and a cap plate coupled to the upper end of the can and having a welding portion welded in contact with an upper end of the electrode assembly.