Lithium Ion Battery Multiple Electrode Cores Heat Dissipation

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Solution Overview

Problem

Lithium ion batteries face issues with heat dispersion, high inner resistance, and mechanical safety due to their cylindrical or square shells with small surface areas, leading to increased temperatures, reduced discharge performance, and safety risks during high-rate discharge and overcharge.

Innovation Solution

The battery design features multiple electrode cores placed in a metal shell with an enlarged surface area for improved heat dispersion, connected via a top and bottom cover assembly with multiple parallel poles, and reinforced with grooves on the outer shell for enhanced mechanical safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a single electrode core with winding or piling-up structure is used, then the battery capacity can be increased, but the electrode plate becomes long and difficult to prepare and wind, or the practical process becomes complicated and yield decreases

Engineering Contradiction:

Improvebattery capacityVSAvoidease of preparing and winding electrode plate

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent divides a single large electrode core into multiple smaller electrode cores (first electrode core and second electrode core). Each electrode core has manageable dimensions that are easy to prepare and wind, while collectively they provide the required high battery capacity. This segmentation resolves the contradiction by making the electrode plate preparation process simple and practical without compromising capacity.

Inventive Principle:

Principle #1Segmentation

2Shape

If a cylindrical or square shell with small surface area is used, then the battery structure is compact, but the heat dispersion rate is insufficient leading to sharp temperature increase and safety problems

Engineering Contradiction:

Improvecompact battery structureVSAvoidheat dispersion rate

Core Design Contradiction:

ShapeVSTemperature

Solution Approach 1:

The patent segments the single electrode core into multiple electrode cores arranged within the compact cylindrical shell. This segmentation increases the internal surface area and creates more heat dissipation pathways within the confined space, improving heat dispersion rate while maintaining the compact cylindrical structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent utilizes the radial dimension within the cylindrical shell by arranging multiple electrode cores in a circular pattern. This dimensional arrangement maximizes the heat dissipation surface area within the compact cylindrical footprint, resolving the contradiction between compact shape and heat dispersion rate.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If a single electrode tab is used to conduct current, then the structure is simple, but the conductivity is low and current distribution is not uniform during charge and discharge

Engineering Contradiction:

Improvestructure simplicityVSAvoidconductivity and current distribution uniformity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the single current conduction path into multiple parallel paths by introducing multiple electrode tabs (first electrode tab and second electrode tab). This segmentation increases overall conductivity and ensures uniform current distribution across the electrode cores during charge and discharge, while maintaining relatively simple tab structure.

Inventive Principle:

Principle #1Segmentation

4Power

If the battery operates at large current, then the power output is high, but the voltage sharply decreases, discharge time is shortened, and capacity is significantly lowered due to high inner resistance

Engineering Contradiction:

Improvepower output at large currentVSAvoiddischarge performance and capacity

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent segments the electrode system into multiple parallel-connected electrode cores with multiple tabs. This segmentation reduces the overall inner resistance by providing multiple parallel current conduction paths, enabling the battery to maintain stable voltage and high capacity during large current discharge operations, thus improving power output without sacrificing discharge performance.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8088509B2Lithium ion battery

Publication Date: 2012.01.03 BYD CO LTD

AI summary

Disclosed herein is a lithium ion battery comprising an electrode core, an electrolyte solution, a metal shell and an end cover assembly, said metal shell comprising an outer wall, an inner wall and a chamber, said electrode core and electrolyte solution being located in the chamber of the metal shell, and said electrode core being connected to the end cover assembly with a electrode terminal of the electrode core, wherein the number of said electrode core is more than one, and the multiple electrode cores are located in the chamber of the metal shell. The lithium ion battery according to the present invention possesses excellent disperse heat dispersion, high mechanical safety, and good high rate discharge performance. In addition, the battery according to the present invention solves the problems of the “wound battery” of the prior art that the electrode plate is long and difficult to wind, and the “stacked battery” of the prior art that the electrode plate is difficult to prepare and pile up by dividing the electrode core of high capacity into multiple electrode core of low capacity placed abreast in the metal shell, whereby simplifying the preparation thereof.