Battery Identification Mark Inner Surface Laser Positioning

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Solution Overview

Problem

Existing identification marks on the outer surfaces of battery housings are prone to damage or deformation due to contact with other components or heat from adjacent batteries, making them difficult to read during and after battery module assembly.

Innovation Solution

The identification mark is positioned on the inner surface of the outer housing can, avoiding contact with other components and heat from adjacent batteries, and is produced using a laser to create a method of producing the battery, ensuring readability by forming the mark using laser irradiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the identification mark is provided on the outer circumferential surface of the outer housing can, then it is easy to read the identification mark, but the identification mark may contact another component such as the battery holder and suffer damage

Engineering Contradiction:

Improvereadability of identification markVSAvoidintegrity of identification mark

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The identification mark is formed on the inner surface of the outer housing can instead of the outer surface, inverting the conventional location. This allows the mark to be protected from external damage while still being readable through the semi-transparent can material.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The outer housing can material acts as an intermediary that allows optical penetration. The identification mark on the inner surface can be read through the can wall, which mediates between the need for protection and the need for readability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the identification mark is provided on the outer circumferential surface of the outer housing can, then it is accessible for reading, but heat abnormally generated from adjacent batteries causes discoloration or deformation of the identification mark

Engineering Contradiction:

Improveaccessibility of identification markVSAvoidheat resistance of identification mark

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The identification mark is relocated from the outer surface to the inner surface of the outer housing can, inverting the conventional approach. This positioning places the mark away from the harmful thermal environment generated by adjacent batteries while maintaining readability through the can material.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The outer housing can wall serves as a thermal barrier and optical mediator. It protects the identification mark on the inner surface from abnormal heat generated by adjacent batteries while still allowing the mark to be read through the material.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the identification mark is provided on the outer surface of the outer housing can, then it can be read easily, but contact with other components during battery module assembly causes damage to the identification mark

Engineering Contradiction:

Improvereadability of identification markVSAvoidquality of identification mark

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The identification mark is formed on the inner surface of the outer housing can instead of the outer surface, inverting the conventional location. This eliminates contact with battery holders and other components during assembly while maintaining readability through the semi-transparent can material.

Inventive Principle:

Principle #13The other way round (Inversion)

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

The inner positioning of the identification mark prevents damage and deformation, allowing easy and accurate reading both during and after battery module assembly, even under abnormal heat conditions.

Implementation Method 1

forming the identification mark by irradiating, with laser light, the outer housing can from outside toward the inner surface

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Data Source

PatentEP4672436A1Battery, and method for manufacturing battery

Publication Date: 2025.12.31 PANASONIC ENERGY CO LTD

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AI summary

A battery according to one embodiment of the present invention comprises: an electrode body in which a positive electrode plate and a negative electrode plate are stacked with a separator therebetween; an exterior can (16) which houses the electrode body and has an opening at one end; and a sealing body which closes the opening of the exterior can (16). The exterior can (16) has an identification indication (36) formed on the inner surface thereof.