Press-Fit Busbar Connection for Removable Storage Modules

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Solution Overview

Problem

Existing electrical storage modules face difficulties in disassembly and reassembly due to bus bars being joined to electrode terminals through welding, making it challenging to reconfigure or reuse components.

Innovation Solution

The electrical storage module employs a press-fitting mechanism where a bus bar is attached to electrode terminals via a press-fitting portion that is inserted into a through-hole or recess of the electrode terminal, allowing for easy detachment and reduced connection resistance, while minimizing mechanical stress on the joint.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the bus bar is joined to the electrode terminal by welding, then the connection strength between the bus bar and electrode terminal is improved, but the ease of disassembly and reassembly deteriorates

Engineering Contradiction:

Improveconnection strengthVSAvoidease of disassembly and reassembly

Core Design Contradiction:

StrengthVSEase of repair

Solution Approach 1:

The connection structure is segmented into a press-fitting portion on the bus bar and a corresponding recess in the electrode terminal, allowing the connection to be divided into insertion and retention phases rather than requiring irreversible welding

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection method transitions from static welding to a dynamic press-fitting mechanism that allows for insertion, removal, and reassembly while maintaining connection strength through elastic deformation and friction

Inventive Principle:

Principle #15Dynamics

2Reliability

If the bus bar is joined to the electrode terminal by welding, then the electrical connection reliability is improved, but the manufacturing flexibility and reconfiguration capability deteriorates

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidmanufacturing flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The press-fitting portion is pre-formed with elastic deformation capability, allowing the connection to be established by simple insertion without requiring complex welding processes during assembly

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The connection method changes from thermal welding to mechanical press-fitting, altering the physical state and properties of the connection interface to enable both reliability and flexibility

Inventive Principle:

Principle #35Parameter changes

3Ease of repair

If a press-fitting mechanism is used to attach the bus bar to the electrode terminal, then the ease of removal and reattachment is improved, but the connection strength may deteriorate

Engineering Contradiction:

Improveease of removal and reattachmentVSAvoidconnection strength

Core Design Contradiction:

Ease of repairVSStrength

Solution Approach 1:

The press-fitting portion is designed with localized elastic deformation characteristics, creating high friction and mechanical interlocking at the contact interface while maintaining overall connection strength

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The connection mechanism combines elastic deformation, friction, and mechanical interlocking in a composite fashion to achieve both ease of removal and sufficient connection strength

Inventive Principle:

Principle #40Composite materials

4Reliability

If the press-fitting portion is press-fitted into the container, then the connection resistance between the bus bar and electrode terminal is reduced, but mechanical stress on the joint increases

Engineering Contradiction:

Improveconnection resistanceVSAvoidmechanical stress

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The press-fitting direction is oriented perpendicular to the insertion direction of the sealing body, utilizing a different spatial dimension to apply connection force without interfering with the sealing joint

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design facilitates easy removal and reattachment of bus bars, reduces connection resistance, and minimizes mechanical stress, enabling easier reconfiguration and reuse of components.

Implementation Method 1

the bus bar includes a press-fitting portion that is press-fitted into the container when attached to the electrode terminal

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP4131304B1Easy removable busbar for an electrical storage module

Publication Date: 2026.03.18 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

An electrical storage module includes: a plurality of electrical storage devices; and a bus bar that connects electrode terminals of the electrical storage devices to each other, in which the electrical storage device includes an outer covering can in which an opening is formed, and a plate-shaped sealing body that is provided with the electrode terminal and is inserted into the opening of the outer covering can, the electrode terminal has a container that includes a through-hole or a recess that is formed in a direction substantially orthogonal to a direction in which the sealing body is inserted into the outer covering can, and the bus bar includes a press-fitting portion that is press-fitted into the container.