Rechargeable Battery Protective Member Sealing
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Solution Overview
Problem
Rechargeable batteries face imperfect sealing issues due to assembly tolerance between the cap plate and the case, leading to potential errors and reduced performance.
Innovation Solution
A rechargeable battery design that includes a protective member with specific folding and bonding portions to enhance the sealing force between the cap plate and the case, covering the edges to minimize exposure and improve sealing, using a polymer sheet with openings for terminals and adhesive for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cap plate is used to seal the case opening, then the battery structure is simplified and assembly is easier, but assembly tolerance leads to imperfect sealing
Solution Approach 1:
A protective member is introduced as an intermediary component between the cap plate and the case. This protective member includes bonding portions that adhere to both the cap plate and the case, creating a mediating sealing layer that compensates for assembly tolerances and ensures reliable sealing without complicating the overall structure
Solution Approach 2:
The protective member is constructed as a flexible thin film structure that can conform to slight variations in assembly positioning. This flexibility allows the protective member to maintain effective sealing contact even when assembly tolerance causes minor misalignments between the cap plate and case
2Device complexity
If the case and cap plate are directly assembled, then the device complexity is reduced, but gaps and exposure occur due to assembly tolerance
Solution Approach 1:
The protective member serves as a mediating element that fills and seals gaps between the cap plate and case. By adhering to both surfaces, it eliminates exposure and sealing gaps caused by assembly tolerance while maintaining simple direct assembly of the main structural components
Solution Approach 2:
The protective member extends in multiple dimensions, with bonding portions at different locations (bottom surface bonding portion for the case, side surface bonding portions for the cap plate). This multi-dimensional configuration ensures comprehensive gap coverage without requiring complex multi-component assembly
3Manufacturing precision
If assembly tolerance is reduced to improve sealing, then sealing precision improves, but manufacturing difficulty and cost increase
Solution Approach 1:
Instead of requiring tight assembly tolerance between the cap plate and case, the protective member acts as a compensating intermediary that ensures sealing precision. This allows manufacturers to use standard tolerance ranges while still achieving reliable sealing, simplifying the manufacturing process
Solution Approach 2:
The invention changes the sealing mechanism from relying on mechanical fit precision (dimensional parameters) to relying on adhesive bonding strength and protective member material properties. This parameter transformation allows sealing precision to be achieved through material selection rather than tight dimensional tolerances
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 improved sealing force reduces the risk of damage and enhances the battery's performance by minimizing gaps and exposure, thereby ensuring better protection and efficiency.
Implementation Method 1
a protective member for covering the case and the cap assembly, and including a first bonding portion corresponding to a bottom surface of the case, a plurality of second bonding portions respectively corresponding to first lateral walls of the case
Data Source
AI summary
A rechargeable battery includes an electrode assembly including a first electrode, a separator, and a second electrode, a case for accommodating the electrode assembly, and defining an opening at a side of the case for receiving the electrode assembly, a cap assembly mounted to the case at the opening of the case, and including a first electrode terminal and a second electrode terminal respectively electrically connected to the first electrode and the second electrode, and a protective member for covering the case and the cap assembly, and including a first bonding portion corresponding to a bottom surface of the case, a plurality of second bonding portions respectively corresponding to first lateral walls of the case, and a plurality of finish portions respectively overlapping opposite ends of the second bonding portions.