Battery Cell Cap Plate Composite for Conductivity and Flame Retardancy

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Solution Overview

Problem

Secondary battery systems used in electric vehicles and hybrid vehicles face challenges with high power consumption, long-term operation, and safety due to potential short circuits, high temperatures, or overcurrents, which can lead to ignition or explosion.

Innovation Solution

A cap plate assembly is designed using a conductive plastic material with a polymer composite including carbon nanotubes, providing high stability in electrical conductivity, mechanical strength, and thermal shock resistance, while also enhancing flame retardancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If carbon material amount is decreased to improve flame retardancy, then safety is improved, but mechanical strength deteriorates

Engineering Contradiction:

Improveflame retardancyVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The polymer composite with carbon nanotubes provides both mechanical strength and flame retardancy. The carbon nanotubes reinforce the polymer matrix, enhancing mechanical properties, while the polymer base provides flame resistance, eliminating the need to reduce carbon material amount.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The cap plate assembly is made entirely from the polymer composite material, ensuring uniform distribution of both mechanical strength and flame retardancy properties throughout the structure, rather than relying on localized carbon material additions.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If conventional materials are used, then manufacturing is simpler, but electrical conductivity stability and mechanical strength are insufficient

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidelectrical conductivity stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The polymer composite material combines the ease of polymer manufacturing with the electrical conductivity of carbon nanotubes. The material can be processed using conventional polymer manufacturing techniques while providing stable electrical conductivity through the carbon nanotube network.

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 cap plate assembly achieves high electrical conductivity, mechanical strength, and thermal shock resistance, while maintaining high flame retardancy, thus ensuring the safety and reliability of secondary battery systems during potential hazardous conditions.

Implementation Method 1

made of a polymer composite including carbon nanotubes

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

high mechanical and thermal shock resistance

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250192295A1Cap plate assembly and battery cell including the same

Publication Date: 2025.06.12 DYP CO LTD

AI summary

Provided is a cap plate assembly provided to cover a cell case of a secondary battery, the cap plate assembly including a top plate having at least a portion penetrated to form a first accommodation hole for connecting an inside and outside of the cell case, and a first electrode unit coupled to the first accommodation hole from above and below the top plate, wherein the first electrode unit includes a first terminal plate held and mounted on the top plate, a first airtight member provided to separate the first terminal plate from the top plate, a first electrode terminal inserted and coupled into the first through hole so as to electrically connect from the inside of the cell case to the first terminal plate, and a first sub-plate connected to a bottom of the first electrode terminal.