Electrode Assembly Spacer Prevents Short Circuits
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Solution Overview
Problem
Lithium secondary batteries face stability and reliability issues due to internal short circuits caused by electrode plate movement, and existing solutions do not effectively prevent these issues while also improving insertability into pouch type battery cases.
Innovation Solution
The electrode assembly includes first and second electrode plates stacked with alternating taps, a separator between them, and a spacer part formed on the lateral surfaces of the edges to maintain uniform spacing and prevent short circuits, enhancing stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode plates are stacked without spacer parts, then the battery structure is simpler and manufacturing is easier, but internal short circuits occur due to electrode plate movement reducing stability and reliability
Solution Approach 1:
A spacer part is introduced as an intermediary component between electrode plates to maintain proper spacing and prevent direct contact. The spacer part includes a body portion positioned between electrodes and a protruding portion that extends into the electrolyte, creating a physical barrier that prevents internal short circuits while maintaining structural simplicity.
Solution Approach 2:
The spacer part is segmented into distinct functional portions: a body portion for structural support and spacing, and a protruding portion for electrical insulation in the electrolyte. This segmentation allows each portion to perform its specific function optimally while keeping the overall design simple.
2Ease of operation
If electrode plates are tightly stacked to improve insertability, then insertion into pouch type battery case is easier, but electrode plate movement causes internal short circuits
Solution Approach 1:
The spacer part acts as a mediator that enables tight stacking for easy insertion while simultaneously preventing electrode plate movement. The body portion maintains spacing during insertion, and the protruding portion prevents movement during operation, resolving the contradiction between insertability and reliability.
3Productivity
If no spacer part is used, then manufacturing process is simpler and productivity is higher, but internal short circuits occur due to lack of spacing
Solution Approach 1:
The spacer part combines multiple functions into a single component: structural support, electrical insulation, and movement prevention. This merging allows the component to be added to the assembly process without significantly complicating manufacturing, while effectively preventing internal short circuits.
Data Source
AI summary
Provided is an electrode assembly for a secondary battery, including: one or more first electrode plates: one or more second electrode plates stacked alternately with the first electrode plates; first electrode taps extended from the first electrode plates, respectively; second electrode taps extended from the second electrode plates, respectively; a separator disposed between the first electrode plates and the second electrode plates; and a spacer part formed on lateral surfaces formed in a stacking direction of edges of the first electrode plates and the second electrode plates, so that, by including the spacer part, internal short circuits can be prevented and insertability into a pouch type battery case can be improved, thereby improving stability, reliability, and productivity thereof.