Secondary Battery Current Collector Layout for Packable High Output
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Solution Overview
Problem
The existing current collection structure of secondary batteries conflicts with the need for increased output and the formation of battery packs, as expanding the current collector tab width for higher output requires the external terminal to be close to the sealing plate, which is incompatible with the zip tie arrangement used to hold multiple batteries together.
Innovation Solution
A secondary battery design with a current collector having a first connection region inside the external terminal and a fuse region positioned outside or identical to the external terminal, allowing for expanded tab width and easy formation of battery packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the width of the current collector tab is expanded to increase the output of the secondary battery, then the power output is improved, but the external terminal must be positioned close to the end portion of the sealing plate, which conflicts with the zip tie arrangement needed for battery pack formation
Solution Approach 1:
The current collector is divided into three distinct regions: a first connection region connected to the current collector tab, a second connection region connected to the external terminal, and a fuse region positioned between them. This segmentation allows the first connection region to be expanded for higher power output while the second connection region maintains proper positioning for battery pack formation, resolving the spatial conflict through functional division of the current collector structure
Solution Approach 2:
The fuse region acts as an intermediary element between the first connection region and the second connection region. By positioning the fuse region in this intermediate zone, the design enables the first connection region to extend toward the end portion of the sealing plate for expanded tab width, while the second connection region remains properly positioned for zip tie arrangement, thus mediating the spatial conflict between power output requirements and battery pack formation requirements
2Power
If the external terminal is positioned close to the end portion of the sealing plate to ensure the fuse region, then the power output is improved, but the zip tie cannot properly hold multiple secondary batteries together in a battery pack
Solution Approach 1:
The current collector is segmented into a first connection region, a second connection region, and a fuse region. This segmentation allows the second connection region to be positioned away from the end portion of the sealing plate to accommodate zip tie arrangement for reliable battery pack formation, while the fuse region ensures proper current interruption function is maintained, thus resolving the conflict between power output and battery pack stability
Solution Approach 2:
The fuse region serves as an intermediary that enables the second connection region to be positioned optimally for battery pack formation. By placing the fuse region between the first and second connection regions, the design allows the external terminal to be positioned away from the sealing plate end, providing space for zip tie arrangement while maintaining the fuse region's critical safety function, thereby ensuring both power output and battery pack stability
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
This design enables high-power secondary batteries that can be easily assembled into safe and efficient battery packs without the need to position the external terminal near the sealing plate, enhancing both power output and pack formation.
Implementation Method 1
a fuse region provided on a current path from the first connection region to the second connection region
Data Source
AI summary
A secondary battery includes an external terminal provided outside a sealing plate of an exterior body, a connection member provided inside the sealing plate and connected to the external terminal, a current collector connected to the connection member, and a current collector tab connected to an electrode body. The current collector has, along a longitudinal direction of the sealing plate, a first connection region connected to the current collector tab, a second connection region connected to the connection member, and a fuse region provided on a current path from the first connection region to the second connection region. In the longitudinal direction of the sealing plate, the first connection region is positioned inside the external terminal, and the fuse region is positioned at a position identical to a position of the external terminal or outside the external terminal.