Battery Tab Arrangement for Broken Tab Redundancy
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Solution Overview
Problem
The production of wound electrode bodies in batteries often results in broken tabs near the innermost periphery, leading to unstable connections between tabs and current collecting units, which affects the performance and reliability of the battery.
Innovation Solution
The battery design includes a specific configuration of tabs with varying positions and orientations around the winding axis, allowing for the identification of broken tabs and ensuring stable connections by using tabs that are not broken, with specific distances and orientations between tab midpoints, and the inclusion of additional tabs to enhance alignment and connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If tabs are positioned near the innermost periphery of the wound electrode body to maximize space utilization, then the battery energy density is improved, but the tabs are prone to breaking during production
Solution Approach 1:
The tab group is divided into multiple tabs (first tab, second tab, third tab, fourth tab) positioned at different radial distances from the winding axis. This segmentation allows the battery to utilize both inner and outer region tabs, maximizing space utilization while providing redundancy - if inner tabs break, outer tabs remain functional.
Solution Approach 2:
The invention changes the radial position parameter of tabs within the tab group. By positioning some tabs closer to the winding axis and others farther away, the design optimizes the balance between space utilization (inner tabs) and mechanical reliability (outer tabs), allowing the system to withstand production stresses while maintaining high energy density.
2Reliability
If multiple tabs are used to improve connection reliability, then the tab connection stability is improved, but the device complexity increases
Solution Approach 1:
Multiple tabs serve multiple functions: they provide redundant electrical connections, enable breakage tolerance, and facilitate heat dissipation. The same tab structure achieves both high reliability through redundancy and simplified manufacturing by using standard winding processes, making the design universally applicable to various battery configurations.
Data Source
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AI summary
A highly reliable battery where multiple tabs and current collecting units are stably connected is provided. In a preferred aspect of the battery disclosed herein, in an electrode body, a first tab and a third tab are arranged such that the middle of the base width of the first tab and the middle of the base width of the third tab are displaced from each other in the perpendicular direction, and a second tab and a fourth tab are arranged such that the middle of the base width of the second tab and the middle of the base width of the fourth tab are displaced from each other in the perpendicular direction.