Battery Shell Insulation Structure for Weld Corrosion Protection

Solution Overview

Problem

The existing coating process for insulating protective films on battery shells is complex and prone to failure due to folding, leading to corrosion of attachment welds.

Innovation Solution

A battery shell design that includes an insulating protective film connected to the shell side wall and an insulating coating covering the attachment weld, eliminating the need for folding and enhancing anti-corrosion protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the insulating protective film is folded to cover the attachment weld, then the anti-corrosion protection of the attachment weld is improved, but the coating process becomes complicated and prone to failure due to flanging and warping

Engineering Contradiction:

Improveanti-corrosion protection of attachment weldVSAvoidcoating process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The insulating protective structure is divided into two independent parts: the insulating protective film for the shell side wall and the insulating coating for the attachment weld. This segmentation eliminates the need to fold the film, simplifying the coating process while ensuring reliable anti-corrosion protection for both areas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different insulating structures are applied to different areas: the insulating protective film is used for the shell side wall where folding is problematic, while the insulating coating is applied specifically to the attachment weld where it provides effective corrosion protection without requiring folding operations.

Inventive Principle:

Principle #3Local quality

2Reliability

If the insulating protective film is folded to cover the attachment weld, then the anti-corrosion protection is improved, but the coating process is complicated to operate

Engineering Contradiction:

Improveanti-corrosion protection of attachment weldVSAvoidcoating process operability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The insulating protective structure is divided into two independent parts: the insulating protective film for the shell side wall and the insulating coating for the attachment weld. This segmentation eliminates the need to fold the film, simplifying the coating process while ensuring reliable anti-corrosion protection for both areas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The mechanical folding operation is replaced by direct application of insulating coating material. Instead of physically folding and attaching the film over the attachment weld, the solution uses coating deposition to provide insulation, which is easier to operate and control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the insulating protective film is folded to cover the attachment weld, then the anti-corrosion protection is improved, but the anti-corrosion protection is prone to failure due to flanging and warping

Engineering Contradiction:

Improveanti-corrosion protection of attachment weldVSAvoidstructural stability of insulating protective film

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The insulating protective structure is divided into two independent parts: the insulating protective film for the shell side wall and the insulating coating for the attachment weld. This segmentation eliminates the need to fold the film, simplifying the coating process while ensuring reliable anti-corrosion protection for both areas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution uses a disposable insulating coating layer applied directly to the attachment weld instead of relying on the mechanical integrity of folded film. The coating provides sufficient protection without requiring the structural stability that folding operations compromise.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS20260011828A1Battery shell, battery cell, battery and electrical device

Publication Date: 2026.01.08 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

A battery shell, a battery cell, a battery, and an electrical device. The battery shell comprises a shell side wall and a shell end wall, which are mutually connected, wherein an attachment weld is provided at the joint between the shell side wall and the shell end wall and is positioned at an end face of the battery shell. The battery shell further comprises an insulating protective film and an insulating coating, wherein the outer side of the shell side wall is connected to the insulating protective film, and the outer side of the attachment weld is covered with the insulating coating.