Winding-Type Battery Core Resists Vibration

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Solution Overview

Problem

Winding-type electric storage devices face issues with electrode assembly movement and damage due to excessive vibration or impact, as the flexible resin core fails to withstand such forces, leading to compressive deformation and potential swaying or movement within the case.

Innovation Solution

A winding-type electric storage device with a core composed of first and second curved sections and opposed sections, where at least part of each curved section is made of stacked two-ply resin sheets, generating a repulsive force to maintain contact with the case and prevent movement, enhancing the electrode assembly's stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a flexible resin sheet is used as the core, then the electrode assembly can be easily formed and housed, but the core cannot withstand excessive vibration or impact, leading to compressive deformation and electrode assembly movement

Engineering Contradiction:

Improveease of forming electrode assemblyVSAvoidwithstand vibration or impact

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The core is constructed by combining a resin sheet with a porous sponge material. The resin sheet provides flexibility and ease of formation, while the sponge material provides structural strength and resistance to compression. This composite structure resolves the contradiction between ease of manufacture and strength by integrating materials with complementary properties.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If the core is made from a single resin sheet, then the structure is simple, but it fails to prevent electrode assembly swaying or movement under excessive vibration or impact

Engineering Contradiction:

Improvecore structure simplicityVSAvoidprevent swaying or movement

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The core combines a resin sheet layer with a porous sponge layer, creating a composite structure that maintains relative simplicity while significantly improving reliability. The resin sheet provides structural continuity and ease of handling, while the sponge material provides compressive strength and vibration damping, together preventing electrode assembly movement under harsh conditions.

Inventive Principle:

Principle #40Composite materials

3Stability of the object's composition

If the core is compressed in the flat direction, then the electrode assembly becomes deformed, but a gap is formed between the electrode assembly and the case, leading to increased movement and potential damage

Engineering Contradiction:

Improveelectrode assembly shape stabilityVSAvoidprevent damage from movement

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The porous sponge material in the core acts as a cushioning element that compresses under vibration or impact forces, absorbing energy before these forces can deform the electrode assembly or create gaps with the case. This beforehand cushioning prevents the chain of events leading to damage by dissipating harmful forces through the sponge's compressible structure.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The composite core structure with resin sheet and sponge material works together to maintain electrode assembly stability. The resin sheet maintains structural integrity while the sponge material provides shock absorption, ensuring the electrode assembly remains stable and maintains proper contact with the case even under compression from vibration or impact.

Inventive Principle:

Principle #40Composite materials

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 solution effectively restricts swaying or movement of the electrode assembly even under excessive vibration or impact, preventing damage by maintaining close contact with the case through the repulsive force generated by the curved sections, thus ensuring the stability and integrity of the device.

Implementation Method 1

each of the first and second curved sections is at least in part composed of a material stacked into two or more plies

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9196427B2Winding-type electric storage device

Publication Date: 2015.11.24 HONDA MOTOR CO LTD

AI summary

A winding-type electric storage device may prevent swaying or movement of an electrode assembly. The winding-type electric storage device includes a flat electrode assembly, which includes a core, and a case in which the electrode assembly is housed, the core including first and second curved sections which are disposed so that the inner circumferential surfaces thereof face to each other, and each of which is at least in part composed of a material stacked into two or more plies, and first and second opposed sections which connect the mutually-opposed first ends and second ends of the first and second curved sections to each other.