Stacked Battery Tab Layout for Lower Resistance and Heat Balance
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Solution Overview
Problem
Existing lithium-ion battery charging and discharging assemblies, particularly the wound-type, suffer from high internal resistance and short battery life due to uneven temperature distribution, while stacked batteries face challenges in consistency and complexity, limiting their application.
Innovation Solution
A stacked charging and discharging assembly with at least two positive and two negative tabs shifted to the same sides of the electrode plates, enhancing uniformity and consistency through specific tab arrangement and connection methods, including crimping, welding, or bonding, and using a ceramic insulating layer for improved insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wound-type charging and discharging assembly is used, then the manufacturing process is simpler and easier to automate, but the internal resistance is high and battery life is short due to uneven temperature distribution
Solution Approach 1:
The battery is divided into multiple stacked charging and discharging units, each with its own tabs and electrode plates. This segmentation allows for better heat dissipation pathways and reduced internal resistance compared to wound-type assemblies, while maintaining manufacturing simplicity through standardized stacking processes
Solution Approach 2:
The patent transitions from the traditional wound-type (2D rolling) to a stacked configuration (3D layering). This dimensional change enables multiple heat dissipation pathways through the stack, reducing temperature gradients and improving battery life while maintaining ease of manufacture through automated stacking processes
2Power
If a stacked charging and discharging assembly is used, then the rate capability, capacity and density are high, but the process steps are complicated and consistency is difficult to achieve
Solution Approach 1:
Multiple tabs (first and second positive tabs, first and second negative tabs) are merged and connected to common connection pieces. This merging reduces the number of individual connections required, simplifies the manufacturing process, and improves consistency by reducing variation in connection resistance across multiple tabs
Solution Approach 2:
The connection pieces serve multiple functions: they connect multiple tabs simultaneously, provide mechanical support, enable heat dissipation, and facilitate electrical connection to external terminals. This multi-functionality reduces overall device complexity while maintaining high rate capability
3Device complexity
If tabs are lead out in full-tab or single-tab manner, then the structure is simple, but the current distribution is uneven and consistency is poor
Solution Approach 1:
The patent uses an asymmetric tab arrangement where multiple tabs are positioned at different locations on the electrode plates and connected to common connection pieces. This asymmetric configuration optimizes current distribution by reducing current density at any single point, improving consistency without significantly increasing structural complexity
Data Source
AI summary
A charging and discharging assembly, a battery core and a battery module are provided in the disclosure, which are applied in a lithium ion battery. The charging and discharging unit includes a positive electrode plate including positive tabs, a negative electrode plate including negative tabs, and a separator for separating the positive electrode plate and the negative electrode plate. The positive tab at least includes a first positive tab and a second positive tab, and the negative tab at least includes a first negative tab and a second negative tab. The positive electrode plate, the separator and the negative electrode plate are stacked with each other. The positive tabs and the negative tabs are respectively shifted to same sides of the positive electrode plate and the negative electrode plate.