Wound Electrode Assembly Layout for Drop-Impact Resistant Batteries
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Solution Overview
Problem
Secondary batteries face challenges in drop-impact resistance and safety due to voltage drops during collisions, and existing designs do not effectively manage electrical shorts to rapidly emit energy without additional anode non-coating portions.
Innovation Solution
The design incorporates an electrode assembly with an inner circumferential tab and a thicker outer circumferential tab, featuring half-coating portions for the anode and cathode active material layers, which increases the area of coating and allows for rapid electrical energy emission during electrical shorts between non-coating portions during drop impacts or collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional anode distal end non-coating portion is provided for rapid energy emission during electrical shorts, then safety during drop impact is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent applies local quality by providing non-coating portions only at specific locations (anode inner circumferential tab and cathode outer circumferential tab) rather than uniformly across the entire electrode structure. This localized approach enables rapid energy emission during electrical shorts while avoiding the complexity of modifying the entire electrode design.
Solution Approach 2:
The patent extracts the necessary non-coating portions from the active material layers at specific locations where they are needed for safety functionality. By removing active material only at the tab regions rather than throughout the electrode, the patent achieves the safety function with minimal structural modification.
2Reliability
If thicker outer circumferential tab is used to prevent voltage drop during impact, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by making the outer circumferential tab thicker than the inner circumferential tab. This localized thickness variation provides enhanced mechanical strength and voltage stability during impact at the critical outer tab location without requiring uniform thickness control across all tabs, thereby managing manufacturing precision requirements.
3Quantity of substance
If half-coating portions are formed at wound ends to increase active material area, then capacity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the electrode coating into distinct regions: fully coated portions and half-coating portions at the wound ends. This segmentation allows the active material to be concentrated at the wound ends where it contributes most to capacity while simplifying the overall coating structure compared to uniform full-coating designs.
Solution Approach 2:
The patent implements local quality by forming half-coating portions specifically at the wound front end and distal end locations. This localized coating approach increases the effective active material area at critical regions while avoiding the complexity of coating the entire electrode surface uniformly.
Data Source
AI summary
Various embodiments of the present invention relate to a secondary battery, and the objective of the present invention is to provide a secondary battery, which has drop-impact resistance, by providing an electrode assembly having a relatively thick inner circumferential and a relatively thin outer circumferential tab. To this end, disclosed is a secondary battery, which comprises an electrode assembly comprising: an anode plate having an inner circumferential tab formed at a wound front end thereof; a separator covering the anode plate; and a cathode plate having an outer circumferential tab formed at a wound distal end thereof.