Dual-Case Secondary Battery Structure for Stable Stacked Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rechargeable batteries with stack-type electrode assemblies face challenges in energy density, distortion, and heat dissipation, particularly in cylindrical and prismatic forms, and require innovative solutions for efficient energy storage and connection.
Innovation Solution
A rechargeable battery design featuring a stack-type electrode assembly with a dual-case structure, where the first and second cases are bonded by an insulation bonding portion to create a sealed inner space, allowing the battery case to function as an electrode terminal for electrical connection without additional members, enabling series or parallel connections by case contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cylindrical battery structure is used, then structural stability and capacity are improved, but it is difficult to arrange in a stacked structure and distortion occurs during charging and discharging
Solution Approach 1:
The battery is divided into two separate cases (first case and second case) that are bonded together, allowing the electrode assembly to be segmented and arranged in a stacked configuration within the combined case structure, resolving the conflict between cylindrical stability and stacked arrangement
2Reliability
If a prismatic battery with aluminum can is used, then durability and mass production suitability are improved, but weight increases and heat dissipation becomes difficult
Solution Approach 1:
The traditional aluminum can structure is extracted and replaced with a bonded case structure consisting of a first case and second case, eliminating the heavy aluminum can while maintaining durability through the bonding connection, thus reducing weight while preserving reliability
3Weight of moving object
If a pouch-type battery is used, then weight reduction and shape diversification are improved, but production cost increases
Solution Approach 1:
The first case and second case are merged through bonding to form a complete battery housing, achieving the weight reduction and shape flexibility of pouch-type batteries while using more cost-effective manufacturing methods similar to traditional cylindrical or prismatic batteries
4Quantity of substance
If a stack-type electrode assembly is used, then energy density is improved, but distortion risk increases
Solution Approach 1:
The stack-type electrode assembly is nested within the bonded case structure formed by the first and second cases, allowing high energy density stacking while the outer case structure provides mechanical support that prevents distortion during charging and discharging cycles
Data Source
AI summary
A rechargeable battery include: an electrode stack that includes a first electrode, a second electrode, and a separator disposed therebetween; and a battery case that accommodates the electrode stack. The battery case includes a first case and a second case, and the first case and the second case are bonded by an insulation bonding portion to seal an inner space of the battery case. The first electrode includes a first electrode current collector and a first electrode active material-layer, and the second electrode includes a second electrode current collector and a second electrode active material layer. The first electrode current collector includes a first protruded portion protruded in a first direction, and the second electrode current collector includes a second protruded portion protruded in a second direction. The first protruded portion is bonded to the first case, and the second protruded portion is bonded to the second case.