Battery Roll Core Connection Layout for Lower Resistance Tabs
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Solution Overview
Problem
Lithium-ion battery roll cores face limitations in charging speed and service life due to temperature rise and internal resistance, which are affected by the width of the tabs and their fixed thickness, leading to restricted current capacity and heat loss.
Innovation Solution
A roll core connecting structure with two roll cores arranged in a specific direction, featuring tabs with opposite polarities on end faces, connected by a strip-shaped adapter and a U-shaped adapter, allowing for larger tab sizes and improved current flow capacity while maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the width of tabs is increased to reduce internal resistance and heat loss, then current capacity is improved, but the arrangement space for tabs along the width direction is limited
Solution Approach 1:
The patent transitions from arranging tabs along the width direction to arranging them along the length direction of the roll core. This dimensional change in tab arrangement allows for increased tab width without consuming width space, thereby reducing internal resistance and heat loss while maintaining compact battery structure.
Solution Approach 2:
The battery pack is divided into multiple battery modules, each containing multiple roll cores with tabs arranged along the length direction. This segmentation allows each tab to have sufficient width for low internal resistance while the overall battery pack maintains compact dimensions through modular arrangement.
2Reliability
If tabs are arranged along the width direction of the roll core, then electrical connection is achieved, but the width of tabs is greatly limited
Solution Approach 1:
The patent changes the tab arrangement from the width direction to the length direction of the roll core. This allows tabs to extend along the length direction with sufficient width for reliable electrical connection, while the battery pack dimensions in the width direction remain compact.
3Ease of manufacture
If fixed thickness of tabs is used, then manufacturing is simplified, but current capacity is restricted
Solution Approach 1:
The patent allows tab thickness to vary locally along the length direction of the roll core. Tabs can have different thicknesses at different positions to optimize current capacity, while maintaining consistent manufacturing processes through controlled local variations rather than requiring complex variable thickness manufacturing.
Data Source
AI summary
The present disclosure relates to the technical field of power batteries, and discloses a roll core connecting structure of a battery and the battery. The battery comprises the roll core connecting structure of the battery; the roll core connecting structure of the battery comprises two roll cores, a first adapter, and a second adapter; the two roll cores are arranged in a first direction; two tabs having opposite polarities are arranged on an end face of each roll core in the first direction; the tabs are arranged in a second direction; in the first direction, the polarities of the two tabs located in the middle are the same, and the polarities of the two tabs located on two ends are the same; the first adapter is in a strip shape and extends in the second direction; the two tabs located in the middle are connected to the first adapter; the second adapter is in a U shape and annularly arranged on the first adapter; the two tabs located on the two ends are respectively connected to the second adapter; the first adapter and the second adapter are respectively configured to be connected to poles of the battery. According to the battery and the roll core connecting structure of the battery, the tabs have good overcurrent capability, and the whole structure is compact.