Rechargeable Battery Core With Segmented Support And Buffer Space

Solution Overview

Problem

Rechargeable batteries face reduced output and lifespan due to stress concentration between the electrode assembly and the core, leading to inefficient charging and discharging, and unstable reactions.

Innovation Solution

A rechargeable battery design featuring a core with support portions and avoidance surfaces that minimize stress by creating a buffer space between the core and the electrode assembly, allowing for reduced stress concentration and improved expansion accommodation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the electrode assembly is tightly fitted to the core, then the structural stability is improved, but stress concentration occurs during expansion and contraction, reducing output and lifespan

Engineering Contradiction:

Improvestructural stabilityVSAvoidlifespan

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The core is designed with differentiated surface regions: contact portions that locally engage with the electrode assembly to provide stability, and non-contact portions that create buffer spaces to prevent stress concentration. This local differentiation allows the core to simultaneously maintain structural stability and reduce harmful stresses during electrode expansion and contraction cycles.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the electrode assembly is tightly fitted to the core, then the structural stability is improved, but stress concentration occurs during expansion and contraction, reducing output

Engineering Contradiction:

Improvestructural stabilityVSAvoidoutput

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The core is designed with differentiated surface regions: contact portions that locally engage with the electrode assembly to provide stability, and non-contact portions that create buffer spaces to prevent stress concentration. This local differentiation allows the core to simultaneously maintain structural stability and reduce harmful stresses during electrode expansion and contraction cycles.

Inventive Principle:

Principle #3Local quality

3Strength

If the core contacts the electrode assembly along its entire surface, then the support is maximized, but expansion accommodation is reduced, causing deterioration

Engineering Contradiction:

ImprovesupportVSAvoidexpansion accommodation

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The core is designed with differentiated surface regions: contact portions that locally engage with the electrode assembly to provide stability, and non-contact portions that create buffer spaces to prevent stress concentration. This local differentiation allows the core to simultaneously maintain structural stability and reduce harmful stresses during electrode expansion and contraction cycles.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The core's surface is segmented into discrete contact portions and non-contact portions. This segmentation allows the core to provide targeted support where needed while creating buffer spaces in other areas that accommodate electrode assembly expansion and contraction, preventing stress concentration and deterioration.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8465869B2Rechargeable battery

Publication Date: 2013.06.18 SAMSUNG SDI CO LTD

AI summary

A rechargeable battery including an electrode assembly having an inner surface and including a positive electrode, a negative electrode, and a separator interposed therebetween, a case having a space for internally housing the electrode assembly, a cap assembly coupled to the case and electrically connected to the electrode assembly, and a core inside the electrode assembly, wherein the core has a length and includes a plurality of support portions contacting the inner surface of the electrode assembly, and a plurality of avoidance surfaces between the support portions and separated from the inner surface of the electrode assembly.