Multi-Tab Battery Cell Structure for Uniform High-Rate Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Batteries with single-tab or mixed single-double tab structures face issues such as high impedance, limited current capacity, and uneven temperature distribution, making them unsuitable for ultra-high rate applications.
Innovation Solution
A multi-tab battery design featuring a battery cell with a separator, positive and negative electrode sheets, and multiple tabs arranged at unequal intervals, which are wound to form a battery cell with overlapping tab projections, reducing impedance and improving temperature and current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-tab structure or single-double tab structure is used, then the battery structure is simple, but the impedance is large and current capacity is limited
Solution Approach 1:
The patent divides the electrode tabs into multiple segments (multiple positive tabs and multiple negative tabs) arranged at different positions along the winding direction. This segmentation increases the effective current collection area and reduces impedance, directly resolving the contradiction between structural simplicity and electrical performance.
Solution Approach 2:
The patent extends the tab arrangement from a single-plane configuration to a multi-dimensional arrangement by positioning tabs at different locations along the winding direction and arranging them in overlapping projections. This dimensional expansion increases current capacity without significantly increasing structural complexity.
2Ease of manufacture
If a single-tab or single-double tab structure is used, then the manufacturing process is simple, but the temperature distribution is uneven
Solution Approach 1:
The patent creates local quality variations by strategically positioning multiple tabs at different locations along the winding direction, with each tab serving a specific local region. This localized tab arrangement ensures uniform current distribution and heat generation across different parts of the battery, resolving the temperature distribution issue while maintaining manufacturing feasibility.
3Reliability
If multiple tabs are arranged at unequal intervals with overlapping projections, then the impedance is reduced and current capacity increases, but the device complexity increases
Solution Approach 1:
The patent merges multiple tab functions into a coordinated system where tabs at different positions work together. The overlapping projection arrangement allows tabs to serve multiple purposes simultaneously - current collection, structural support, and thermal management - thereby achieving improved electrical performance without proportionally increasing complexity.
Data Source
AI summary
A multi-tab battery and an electronic device are provided. The multi-tab battery includes a housing and a battery cell. The battery cell is arranged in the housing. The battery cell includes a separator, a positive electrode sheet, a negative electrode sheet, a plurality of positive electrode tabs and a plurality of negative electrode tabs. The plurality of positive electrode tabs are arranged at intervals along a first direction and protrude from the positive electrode sheet by a first length in an extension direction of the battery cell, and the plurality of negative electrode tabs are arranged at intervals along a second direction and protrude from the negative electrode sheet by a second length in the extension direction of the battery cell.