Battery Structural Member Welding Region for Crack-Resistant Joining

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Solution Overview

Problem

Battery components prone to deformation and cracking during welding, leading to poor welding quality and increased manufacturing difficulties.

Innovation Solution

A structural member with a welding region comprising a first portion and a second portion, where the second portion has a weaker ability to receive welding energy, allowing it to preheat the first portion and mitigate deformation and cracking, while enabling identification of welding quality based on color changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If welding is performed on battery components using conventional methods, then welding connection is achieved, but deformation and cracking occur during welding

Engineering Contradiction:

Improvewelding connection strengthVSAvoidcomponent deformation and cracking

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The welding region is divided into a first portion and a second portion with different welding energy reception abilities. The first portion has stronger ability to receive welding energy for effective welding connection, while the second portion has weaker ability to avoid excessive heat input. This segmentation allows different parts of the same component to handle welding energy differently, resolving the contradiction between achieving strong welding connection and preventing deformation/cracking.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the welding region are given different local properties: the first portion is designed with characteristics that enable it to receive more welding energy (for strong connection), while the second portion is designed with characteristics that limit its energy reception (to prevent deformation). This local differentiation of properties allows the component to simultaneously achieve strong welding where needed and avoid damage where sensitive.

Inventive Principle:

Principle #3Local quality

2Strength

If welding energy is increased to improve welding quality, then welding strength improves, but deformation and cracking increase

Engineering Contradiction:

Improvewelding qualityVSAvoiddeformation and cracking

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The second portion acts as an intermediary element between the welding energy source and the first portion. It receives welding energy first (due to its position and weaker energy reception ability), which preheats the first portion and allows the welding energy to be distributed more gradually. This intermediary function reduces the shock of high-energy input to the first portion, preventing deformation and cracking while still achieving strong welding connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The second portion performs a preliminary action by receiving welding energy first and preheating the welding region before the first portion undergoes full welding. This preliminary energy absorption and heat distribution prepares the material structure, reducing thermal shock and preventing cracking during the subsequent welding of the first portion.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If welding energy reception ability is made uniform across the welding region, then manufacturing is simpler, but welding quality cannot be optimized for different areas

Engineering Contradiction:

Improvewelding region preparationVSAvoidwelding quality optimization

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The welding region is designed with different local properties: the first portion has characteristics optimized for strong welding connection (higher energy reception ability), while the second portion has characteristics optimized for preventing deformation (lower energy reception ability). This local quality differentiation allows each area to be optimized for its specific function, achieving both manufacturing simplicity through a unified structure and welding quality optimization through differentiated properties.

Inventive Principle:

Principle #3Local quality

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 structural member reduces deformation and cracking during welding, facilitates production of high-quality welded products, and simplifies the identification of welding quality through visual inspection.

Implementation Method 1

the second portion can be used to preheat the first portion

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 2

penetration welding

Methodology Applied

Scientific EffectLaser welding: Laser Beam Welding

Implementation Method 3

welding between components

Methodology Applied

Scientific EffectArc welding: Electric Arc

Data Source

PatentUS20260051630A1Structural member and preparation method thereof, battery cell, battery, and electric device

Publication Date: 2026.02.19 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

A structural member and a preparation method thereof, a battery cell, a battery, and an electric device. The structural member includes a welding region to be welded to a target member. The welding region includes a first portion and a second portion. The second portion has a weaker ability to receive welding energy than the first portion, where the ability to receive welding energy refers to a depth of a weld penetration formed at a welding site.