Secondary Battery Electrode Assembly With Adjustable Tab Output
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Solution Overview
Problem
Existing secondary battery electrode assemblies face challenges in adjusting output while minimizing heat generation during repetitive charge and discharge, making them unsuitable for devices requiring high output.
Innovation Solution
The electrode assembly features multiple positive and negative electrodes with varying numbers of tabs, allowing for adjustable output by using different tab bundles for low-rate, high-rate, and maximum-rate conditions, with specific tab configurations and connections to manage current flow and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple electrode tabs are used to increase output, then power delivery capability is improved, but heat generation during charge and discharge increases
Solution Approach 1:
The electrode assembly is divided into multiple independent electrode sets, each with its own tabs. This segmentation allows current to be distributed across multiple parallel paths, reducing current density and heat generation at any single tab while maintaining high total output capability
Solution Approach 2:
The patent provides different tab configuration options (single tab, two tabs, three tabs, or four tabs per electrode) that can be dynamically selected based on the specific application requirements for output and heat management, allowing optimization for different operating conditions
2Power
If electrode tab configuration is fixed to optimize for high output, then power delivery is improved, but adaptability to different output requirements is reduced
Solution Approach 1:
The patent enables dynamic adaptation by allowing different numbers of tabs per electrode (1-4 tabs) and providing options for connecting tabs in series or parallel configurations. This dynamic design flexibility allows the same electrode assembly structure to be adapted to various output requirements without redesigning the entire system
Solution Approach 2:
The electrode assembly design serves multiple functions through its configurable tab system: it can operate in high-current mode with parallel connections for maximum power, or in low-current mode with series connections for extended duration applications, making the design universally applicable to different device requirements
3Quantity of substance
If multiple electrode sets are stacked to increase capacity, then energy density is improved, but heat generation from repetitive charge and discharge increases
Solution Approach 1:
By stacking multiple electrode sets with distributed tabs rather than using a single large electrode, the patent segments the current flow paths. This reduces the current density at each tab connection point, thereby reducing I²R heat generation while maintaining high total capacity through the stacked configuration
Solution Approach 2:
The patent applies different tab configurations to different electrodes within the stack (some electrodes may have 1 tab, others 2, 3, or 4 tabs), optimizing the local current distribution characteristics of each electrode based on its position and function in the overall battery assembly, thereby managing heat generation locally while maintaining high total capacity
Data Source
AI summary
An electrode assembly for a secondary battery includes at least one positive electrode and at least one negative electrode alternately stacked in a state in which a separator is interposed therebetween. The positive electrode includes a first positive electrode having a single positive electrode tab and a second positive electrode having two or more positive electrode tabs. The negative electrode includes a first negative electrode having a single negative electrode tab and a second negative electrode having two or more negative electrode tabs. The output of the electrode assembly is adjustable.