Power Storage Module Busbar Cutout Design

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Solution Overview

Problem

Existing power storage modules, such as battery modules, require further improvements in performance, particularly in maintaining high energy density and efficient thermal management.

Innovation Solution

The power storage module incorporates a busbar with cutout portions and a holder with elongated portions that facilitate positioning and reduce the size of the holder, allowing for improved energy density and thermal management by minimizing contact between the holder and fuse portions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the holder size is reduced to improve energy density, then the holder may contact fuse portions causing safety issues

Engineering Contradiction:

Improveenergy densityVSAvoidholder contact with fuse portions

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The busbar is extracted from the holder structure by providing cutout portions in the busbar that face the holder. This separation ensures the holder does not contact the fuse portions of the busbar, eliminating the harmful effect while maintaining compact design for high energy density.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The busbar is segmented by providing cutout portions (removing parts or creating through-holes) in the area facing the holder. This segmentation creates physical separation between the holder and fuse portions, preventing unwanted contact while maintaining electrical connectivity through the current collector plate.

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If the holder size is reduced, then energy density improves but manufacturing complexity increases

Engineering Contradiction:

Improveenergy densityVSAvoidholder manufacturing

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Quantity of substance

If the holder size is reduced for better energy density, then thermal management may be compromised

Engineering Contradiction:

Improveenergy densityVSAvoidthermal management

Core Design Contradiction:

Quantity of substanceVSTemperature

Solution Approach 1:

The busbar is extracted from the holder structure by providing cutout portions in the busbar that face the holder. This separation ensures the holder does not contact the fuse portions, eliminating thermal interference while maintaining compact design for high energy density.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP4645574A1Power storage module

Publication Date: 2025.11.05 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

The present invention includes: a plurality of power storage devices (10); a holder (28) that covers one end of each of the plurality of power storage devices (10) and that has an opening (20) formed in a first surface thereof, for exposing a terminal of the power storage device; a current collector plate (16) that is disposed on the side of the first surface of the holder (28), and one end of which is connected to the terminal via the opening (20); and a bus bar (22) that is connected to the other end of the current collector plate (28). The bus bar (22) has, in an area facing the holder (28), a notch formed by removing a part of the bus bar or a notch portion formed of a through-hole.