Secondary Battery Multi-Tab Electrode Design

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Solution Overview

Problem

The existing secondary battery design with only one current collection tab per turn results in significant variation in distance to the electrode plates, leading to increased potential differences and reduced durability, and insufficient output current.

Innovation Solution

The secondary battery design incorporates at least two current collection tabs per turn for both the positive and negative electrode plates, with varying protrusion lengths and widths, to reduce distance variation and enhance current collection efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If only one current collection tab is provided per turn, then the device complexity is reduced, but the potential difference increases and durability decreases

Engineering Contradiction:

Improvenumber of current collection tabsVSAvoiddurability of secondary battery

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The current collection function is segmented into multiple tabs instead of using a single tab. Each tab collects current from different regions of the electrode plate, dividing the current collection task into multiple parallel paths that reduce potential differences and improve durability.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If only one current collection tab is provided per turn, then the manufacturing process is simplified, but the output current is insufficient

Engineering Contradiction:

Improvesimplicity of tab configurationVSAvoidoutput current of secondary battery

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Reliability

If multiple current collection tabs with varying protrusion lengths and widths are provided, then the current collection efficiency is improved, but the device complexity increases

Engineering Contradiction:

Improvecurrent collection efficiencyVSAvoidvariability of tab dimensions

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Different regions of the electrode plate have different current collection requirements. The tabs are designed with varying protrusion lengths and widths to match the local current density distribution, with tabs in high-current-density regions having different dimensions than those in low-current-density regions.

Inventive Principle:

Principle #3Local quality

4Reliability

If multiple current collection tabs with varying protrusion lengths and widths are provided, then the potential difference is reduced, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvepotential difference uniformityVSAvoidprecision of tab dimensions

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20230238564A1Secondary battery

Publication Date: 2023.07.27 SANYO ELECTRIC CO LTD

AI summary

At one edge of a positive electrode plate in a winding axis direction of an electrode body, two positive electrode tabs per turn are provided to protrude from the edge. At the other edge of a negative electrode plate in the winding axis direction of the electrode body, two negative electrode tabs per turn are provided to protrude from the edge. The multiple positive electrode tabs provided to protrude from the positive electrode plate include multiple types of positive electrode tabs having different protrusion lengths and proximal end widths, and the multiple negative electrode tabs provided to protrude from the negative electrode plate include multiple types of negative electrode tabs having different protrusion lengths and base end widths.