Battery Tab Overlap Structure for Lower Internal Resistance

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Solution Overview

Problem

Existing power storage devices face challenges in reducing internal resistance due to a large number of components in the conductive path from the electrode body to the positive electrode external terminal.

Innovation Solution

The power storage device design includes an electrode body with a plurality of tabs that overlap and are joined to an external terminal, reducing the number of components in the conductive path and improving the uniformity of stress distribution among the tabs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a multi-tab structure is used to reduce internal resistance, then the output capability is improved, but the number of parts in the conductive path increases

Engineering Contradiction:
Improveoutput capabilityVSAvoidnumber of parts in conductive path
Core Design Contradiction:
PowerVSDevice complexity

Solution Approach 1:

The patent merges multiple tabs and current collecting members into an integrated structure where tabs are directly connected to the current collecting member, reducing the number of separate parts in the conductive path while maintaining low internal resistance and high output capability

Inventive Principle:
Principle #5Merging (Combining)

2Quantity of substance

If multiple tabs are used to increase battery capacity, then the energy storage is improved, but the uniformity of stress distribution among tabs deteriorates

Engineering Contradiction:
Improvebattery capacityVSAvoiduniformity of stress distribution
Core Design Contradiction:
Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by designing tabs with different widths at different positions, where tabs closer to the electrode body end have larger widths to bear more stress, creating uniform stress distribution across all tabs while maintaining high battery capacity

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS20250219261A1Power storage device
Publication Date: 2025.07.03 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
  • US20250219261A1 patent drawing
  • US20250219261A1 patent drawing
  • US20250219261A1 patent drawing

AI summary

A power storage device includes: an electrode body formed by winding a positive electrode, a negative electrode, and a separator; a cap disposed close to one end of the electrode body in a winding axis direction of the electrode body; and a plurality of positive electrode tabs connecting the positive electrode to the cap, the plurality of positive electrode tabs at least partially overlapping each other forming an overlapped part that is joined to the cap.