Battery Cap Plate Bending Induction Groove

Solution Overview

Problem

Lithium secondary batteries face instability and risk of ignition due to deformation under compressive forces, leading to potential shorts between electrode plates, as they become thinner while energy density increases, making them vulnerable to shock and compression.

Innovation Solution

Incorporating a bending induction groove on the cap plate of the battery cell, which causes the battery to symmetrically bend when a compressive force is applied laterally, reducing the likelihood of case rupture and electrode plate shorts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the battery is made thinner to increase energy density, then the energy density per unit weight is improved, but the stability and resistance to deformation under compressive forces deteriorates

Engineering Contradiction:

Improveenergy densityVSAvoidstability under compression

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The bending induction groove is pre-formed on the cap plate before the battery experiences compressive forces. This preliminary structural feature ensures that when compression occurs, the battery will bend symmetrically from the center rather than deform unpredictably, thus maintaining reliability while achieving thin design for higher energy density.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bending induction groove is specifically located at the central portion of the cap plate, creating a localized structural feature that influences the overall bending behavior. This local modification enables controlled symmetric bending without compromising the entire battery structure, allowing thin design while maintaining compression stability.

Inventive Principle:

Principle #3Local quality

2Weight of moving object

If the battery is made thinner to reduce weight, then the weight is reduced, but the vulnerability to shock and compression increases

Engineering Contradiction:

Improvebattery weightVSAvoidvulnerability to shock and compression

Core Design Contradiction:

Weight of moving objectVSObject-affected harmful factors

Solution Approach 1:

The bending induction groove is pre-formed on the cap plate before the battery experiences compressive forces. This preliminary structural feature ensures that when compression occurs, the battery will bend symmetrically from the center rather than deform unpredictably, thus maintaining reliability while achieving thin design for higher energy density.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bending induction groove is specifically located at the central portion of the cap plate, creating a localized structural feature that influences the overall bending behavior. This local modification enables controlled symmetric bending without compromising the entire battery structure, allowing thin design while maintaining compression stability.

Inventive Principle:

Principle #3Local quality

3Device complexity

If no bending induction groove is provided, then the device complexity is reduced, but the risk of case rupture and electrode plate shorts increases

Engineering Contradiction:

Improvecap plate structureVSAvoidcase rupture and electrode plate shorts

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The bending induction groove is pre-formed on the cap plate before the battery experiences compressive forces. This preliminary structural feature ensures that when compression occurs, the battery will bend symmetrically from the center rather than deform unpredictably, thus maintaining reliability while achieving thin design for higher energy density.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bending induction groove is specifically located at the central portion of the cap plate, creating a localized structural feature that influences the overall bending behavior. This local modification enables controlled symmetric bending without compromising the entire battery structure, allowing thin design while maintaining compression stability.

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 design enhances the battery's stability by increasing the probability of central bending over edge rupture, thereby preventing ignition and explosion, and maintaining the battery's structural integrity under compressive forces.

Implementation Method 1

the cap plate includes at least one bending induction groove at a periphery of a central portion of the cap plate in a region between an edge and the central portion of the cap plate... causes the battery to symmetrically bend when a compressive force is applied laterally

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9246141B2Secondary battery

Publication Date: 2016.01.26 SAMSUNG SDI CO LTD

AI summary

A secondary battery including an electrode assembly; a case accommodating the electrode assembly; a cap plate covering the case; and an electrode terminal electrically connected to the electrode assembly, wherein the cap plate includes at least one bending induction groove at a periphery of a central portion of the cap plate in a region between an edge and the central portion of the cap plate.