Battery Cell Current Collector Layout for Higher Current and Lower Heat
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Solution Overview
Problem
Conventional battery cells suffer from insufficient current-carrying capacity and severe heat generation due to poor performance of the current collector, leading to a shortened service life and reduced safety.
Innovation Solution
A battery cell design featuring a current collector with a first connection region and a second connection region, where the first connection region includes a central portion and multiple first connection portions, ensuring a connection width that meets the minimum current-carrying requirement, thereby enhancing the current-carrying capacity and stability of the electrical connection between the jelly roll and the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional current collector is used to connect the jelly roll and housing, then the electrical connection is simple, but the current-carrying capacity is insufficient causing severe heat generation
Solution Approach 1:
The current collector is divided into a first connection region with multiple first connection portions and a second connection region. The first connection portions are separately connected to the central portion and electrically connected to the jelly roll, while the second connection region is connected to the housing. This segmentation increases the current-carrying capacity by distributing current through multiple parallel connection paths.
Solution Approach 2:
The first connection portion has a specifically designed connection width H that satisfies the inequality nKHδ≥C, where different regions of the current collector have different functional characteristics. The first connection region is optimized for current carrying with sufficient width, while the second connection region is optimized for structural connection to the housing.
2Reliability
If the current collector connection width is increased to meet current-carrying requirements, then the current-carrying capacity improves, but the device complexity increases
Solution Approach 1:
The current collector serves multiple functions: it provides electrical connection between the jelly roll and housing, acts as a structural support component, and ensures sufficient current-carrying capacity through its designed geometry. The same current collector structure simultaneously achieves electrical connectivity, mechanical support, and thermal management.
Solution Approach 2:
The current collector's connection width H is specifically designed to satisfy the inequality nKHδ≥C, where parameters such as the quantity of first connection portions (n), current-carrying coefficient (K), connection width (H), and thickness (δ) are optimized to meet the minimum current-carrying requirement (C) while maintaining a simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The improved current collector design ensures sufficient current-carrying capacity, preventing heat generation and prolonging the service life of the battery cell, thereby increasing the safety and reliability of the battery cell.
Implementation Method 1
the first connection portions are electrically connected to the jelly roll, the second connection region is electrically connected to the housing
Data Source
Figure 1
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AI summary
A battery cell (1000), a battery pack (2000), and an electric apparatus (3000) are provided. The battery cell includes a housing (500), a jelly roll (200), and a current collector (100). A first connection region (120) of the current collector includes a central portion (122) and a plurality of first connection portions (121) electrically connected to the jelly roll in a circumferential direction of the central portion. A straight-line distance between opposite side walls at a connection position of the first connection portion and the central portion is a connection width H, nKHδ≥C, where C is a minimum current-carrying requirement of the jelly roll, n is a quantity of the first connection portions, δ is a thickness of the first connection portion, and K is a current-carrying coefficient of the current collector.