Battery Pouch Adhesive Design for Shock Distribution

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Solution Overview

Problem

Batteries in electronic devices are prone to damage from external shocks or loads, such as those generated by falls, which can focus stress on the junction portions between the electrode assembly and the pouch, leading to potential cracking or short circuits.

Innovation Solution

A battery design featuring a pouch with an electrode assembly where the positive and negative electrodes are rolled up together, secured by adhesive members to distribute external shocks and loads more evenly, reducing the risk of damage by dispersing stress across multiple adhesive interfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the electrode assembly is fixed to the pouch at the junction portion, then the battery structure is stabilized, but the stress concentration at the junction portion increases under external shock

Engineering Contradiction:

Improvebattery structure stabilityVSAvoidstress concentration at junction portion

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The battery structure is divided into multiple functional regions: a fixed region where the electrode assembly is secured to the pouch, and a non-fixed region that allows movement. This segmentation enables the fixed region to provide structural stability while the non-fixed region absorbs stress, preventing stress concentration at the junction portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the battery are given different mechanical properties. The fixed region has high structural rigidity for stability, while the non-fixed region has flexibility to accommodate shock and distribute stress. This local differentiation of mechanical properties resolves the contradiction between stability and stress concentration.

Inventive Principle:

Principle #3Local quality

2Shape

If the electrode assembly is firmly attached to the pouch, then the battery maintains its shape, but damage occurs to the battery under external load

Engineering Contradiction:

Improvebattery shape maintenanceVSAvoidbattery damage resistance

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The battery is segmented into a fixed region that maintains shape and a non-fixed region that absorbs external loads. The fixed region includes the junction portion where the electrode assembly is attached to the pouch, while the non-fixed region allows controlled movement to dissipate impact energy, preventing damage to critical components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The non-fixed region acts as a pre-designed cushioning zone that absorbs external shocks before they reach the electrode assembly and pouch junction. This beforehand cushioning protects the battery from damage while maintaining the overall shape through the fixed region.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS11641042B2Battery and electronic device comprising same

Publication Date: 2023.05.02 SAMSUNG ELECTRONICS CO LTD

AI summary

A battery, according to one embodiment of the present invention, may comprise: a pouch; an electrode assembly received in the pouch in a state in which a positive electrode substrate, a negative electrode substrate disposed below the positive electrode substrate, and a separator disposed between the positive electrode substrate and the negative electrode substrate are rolled up together; a first adhesive member for fixing at least one portion of one end of the electrode assembly to the rolled up outer surface of the electrode assembly; and a second adhesive member for providing fixing between the electrode assembly and the pouch at a region other than the region where the first adhesive member is disposed.