Secondary Battery Multi-Stack Structure for Thickness Scaling
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Solution Overview
Problem
Existing technologies lack a clear method to efficiently enlarge secondary batteries for higher capacity and energy density, particularly in the thickness direction, and improve their voltage.
Innovation Solution
A secondary battery design comprising a plurality of electrode assemblies housed in a case with a cap plate and terminal, featuring a tab structure that prevents short circuits and allows for scalable thickness and voltage enhancement through a multi-stack jellyroll and multi-terminal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery size is enlarged to achieve higher capacity and energy density, then the capacity and energy density are improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The battery is divided into multiple electrode assemblies stacked within a single case, with each assembly containing multiple jellyrolls. This segmentation allows the battery to achieve high capacity through increased quantity of active materials without requiring a completely new structural design, as each assembly follows a standardized configuration
Solution Approach 2:
Multiple jellyrolls are nested within each electrode assembly, with tabs extending from the jellyrolls to connect to terminals. The nested structure of jellyrolls within assemblies, and assemblies within the battery case, enables scalable capacity increase while maintaining a compact and organized structure that manages complexity
2Quantity of substance
If the battery is enlarged in the thickness direction to improve capacity, then the capacity is improved, but the voltage stability and short circuit prevention become more difficult
Solution Approach 1:
Cap plates are positioned at specific locations (first and second ends of the case) to provide localized electrical connection and short circuit prevention at critical interfaces. The tab structure extends from specific locations on jellyrolls to connect to terminals, ensuring reliable electrical pathways while maintaining voltage stability throughout the thick battery structure
Solution Approach 2:
Tabs serve as intermediaries between the jellyrolls and terminals, providing reliable electrical connection while maintaining proper spacing and alignment. The cap plates act as intermediaries that distribute and stabilize voltage across multiple electrode assemblies, preventing short circuits in the thickness direction
3Power
If multiple electrode assemblies are stacked to increase voltage and capacity, then the voltage and capacity are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The battery is segmented into multiple electrode assemblies that can be manufactured and assembled separately. Each assembly contains a standardized number of jellyrolls with tabs extending in consistent directions, allowing for modular assembly that reduces the cumulative effect of manufacturing variations and maintains voltage stability
Solution Approach 2:
Multiple jellyrolls are combined within each electrode assembly with their tabs extending to common terminals. This merging of multiple electrochemical elements into standardized assemblies allows for voltage increase through stacking while maintaining manufacturing precision through repeatable assembly procedures
Data Source
AI summary
A secondary battery and a battery module are disclosed. A secondary battery includes a plurality of electrode assemblies, each including an electrode forming a tab, a case accommodating the plurality of electrode assemblies, a cap plate covering an opening of the case, and a terminal protruding from the outside of the cap plate and electrically connected to the plurality of electrode assemblies.