Segmented Lithium-Replenishing Anode Plate for Heat Dissipation
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Solution Overview
Problem
Existing lithium-ion batteries face challenges in achieving high energy density, long cycle life, and stable performance due to the generation of reaction heat during lithium replenishing, which affects their comprehensive performance.
Innovation Solution
A lithium-replenishing negative electrode plate is designed with a strip-shaped lithium-replenishing layer that includes interconnected lithium-replenishing regions and gap regions, optimizing the ratio of these regions to effectively dissipate heat and improve electrolyte infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium replenishing is applied to increase energy density, then battery energy density is improved, but a large amount of reaction heat is generated which affects cycle life and dynamic performance
Solution Approach 1:
The lithium-replenishing layer is divided into multiple strip-shaped regions separated by gap regions, creating a segmented structure that distributes heat generation across multiple smaller zones rather than one large continuous zone, facilitating heat dissipation
2Quantity of substance
If lithium replenishing is applied to increase energy density, then battery energy density is improved, but cycle life is affected due to heat generation
Solution Approach 1:
The lithium-replenishing layer is segmented into multiple strips with gaps between them, creating a structure that reduces heat accumulation and improves thermal management, thereby preserving cycle life while maintaining energy density benefits
Solution Approach 2:
The gap regions create localized areas with different thermal and electrochemical properties, allowing for improved electrolyte infiltration and heat dissipation in specific zones while maintaining lithium replenishing function in the active regions
3Quantity of substance
If lithium replenishing is applied to increase energy density, then battery energy density is improved, but dynamic performance is affected due to heat generation
Solution Approach 1:
The strip-shaped lithium-replenishing regions with intervening gaps create a structure that enhances heat dissipation efficiency, preventing thermal buildup that would otherwise degrade dynamic performance during high-rate charging and discharging operations
4Productivity
If a continuous lithium-replenishing layer is used, then lithium replenishing efficiency is improved, but heat dissipation is insufficient leading to heating problems
Solution Approach 1:
The lithium-replenishing layer is divided into multiple strip-shaped regions separated by gap regions, maintaining sufficient lithium replenishing area while creating thermal pathways through the gaps that enable effective heat dissipation and prevent overheating
5Ease of manufacture
If the ratio of lithium-replenishing region to gap region is not optimized, then manufacturing is simplified, but electrochemical performance is not improved
Solution Approach 1:
The patent specifies that the width of lithium-replenishing regions and gap regions should satisfy a particular ratio relationship, optimizing the balance between lithium replenishing efficiency and heat dissipation capability while maintaining manufacturability
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 enhances the energy density, cycle life, and dynamic performance of lithium-ion batteries by efficiently managing heat dissipation and electrolyte infiltration, thereby improving their overall electrochemical performance.
Implementation Method 1
the lithium-replenishing region and the gap region are interconnected in order... quickly dissipate a large amount of heat generated during lithium replenishing
Implementation Method 2
dissipate heat generated during lithium replenishing through an air channel formed by the lithium-replenishing region and the gas region
Implementation Method 3
the channel formed by the lithium-replenishing region and the gas region can enable the negative electrode plate to be effectively impregnated with the electrolyte
Implementation Method 4
enable the negative electrode plate to be effectively impregnated with the electrolyte after electrolyte injection
Data Source
AI summary
A negative electrode plate, a lithium-ion battery and an apparatus are disclosed. The negative electrode plate includes a negative electrode current collector, a negative electrode active material layer including a negative electrode active material and disposed on at least one surface of the negative electrode current collector, and a lithium-replenishing layer disposed on a surface of the negative electrode active material layer away from the negative current collector. The negative electrode plate can effectively ameliorate the problem of plate heating, and channels formed by the lithium-replenishing region and the gap region can enable the lithium-ion battery to be effectively impregnated with the electrolyte after electrolyte injection is performed to the lithium-ion battery, thereby improving the energy density of the battery while also improving the service life and kinetic performance of the battery.