Battery Cap Assembly With Embedded Terminals for Lower Resistance
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Solution Overview
Problem
Existing secondary battery designs face challenges in optimizing the arrangement of terminals within the cap assembly, leading to increased resistance and reduced space for the electrode assembly, which affects the battery's capacity and performance.
Innovation Solution
The cap assembly incorporates an insulating member and a conductive member to space the terminals from the cap plate, allowing them to be embedded within the cap plate, reducing the current path resistance and increasing the available space for the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals are arranged conventionally in the cap assembly, then the cap plate structure is simple, but the resistance increases and the space for electrode assembly decreases
Solution Approach 1:
An insulating member is introduced as an intermediary component between the terminal and the cap plate. This insulating member includes a terminal receiving portion that embeds the terminal, thereby reducing resistance while maintaining structural integrity. The intermediary component resolves the contradiction by providing both electrical insulation and mechanical support without significantly increasing overall complexity.
Solution Approach 2:
The terminal is nested within the terminal receiving portion of the insulating member, which is itself integrated into the cap plate structure. This nesting arrangement allows the terminal to be embedded rather than protruding, reducing resistance and optimizing space for the electrode assembly while keeping the cap assembly compact.
2Volume of stationary object
If terminals protrude from the cap plate, then the cap assembly structure is simple, but the available space for electrode assembly decreases
Solution Approach 1:
The terminal is nested within the terminal receiving portion of the insulating member, which is integrated into the cap plate. This embedding structure eliminates terminal protrusion, maximizing the internal volume available for the electrode assembly while maintaining a compact overall design.
Solution Approach 2:
Instead of allowing terminals to protrude in the vertical dimension, the invention transitions to a planar integration approach where terminals are embedded within the cap plate structure. This dimensional reorganization optimizes the internal space for electrode assembly placement.
3Productivity
If terminals are embedded in the cap plate using insulating members, then resistance is reduced and space for electrode assembly is increased, but the cap assembly structure becomes more complex
Solution Approach 1:
The insulating member serves multiple functions simultaneously: it provides electrical insulation, mechanically supports the terminal through the terminal receiving portion, and integrates into the cap plate structure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall structural complexity while achieving reduced resistance and optimized space.
Solution Approach 2:
The insulating member is merged with the cap plate structure, forming an integrated assembly. The terminal receiving portion is combined with the cap plate to create a unified structure that holds the terminal securely while maintaining insulation and structural integrity, thus minimizing the increase in device complexity.
Data Source
AI summary
A cap assembly including: a cap plate coupled to a case having an open top portion, the cap plate having a first terminal through-hole and a second terminal through-hole; a first terminal and a second terminal located in the first terminal through-hole and the second terminal through-hole, respectively, and electrically connected to an electrode assembly accommodated in the case; and at least one insulating member electrically insulating the cap plate from at least one of the first terminal or the second terminal.