Battery Connection Member Bending Structure for Higher Energy Density
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Solution Overview
Problem
Lithium-ion batteries face challenges in space utilization and energy density due to the need for a large welding area to prevent temperature rise from overcurrent, leading to low space utilization and potential damage during the bending process of connection members.
Innovation Solution
A connection member with a guide plate and a first connecting plate, featuring indentations that facilitate accurate bending, reducing the risk of damage and improving assembly by forming a thin part between the plates, thus enhancing space utilization and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery core is made large enough in longitudinal direction to provide sufficient welding area, then the temperature rise from overcurrent is protected against, but the space utilization and energy density become low
Solution Approach 1:
The first connecting plate is bent from a planar configuration to a three-dimensional folded structure, changing its spatial arrangement from two-dimensional to three-dimensional. This allows the connecting plate to achieve a compact form that reduces the longitudinal dimension while maintaining sufficient welding area, thereby improving space utilization without compromising reliability
2Volume of moving object
If the first connecting plate is bent to improve space utilization, then the energy density increases, but the connection member may be damaged during the bending process
Solution Approach 1:
An indentation is pre-formed at the bending position before the actual bending operation. This preliminary structural preparation creates a designated folding line that guides the bending process, concentrates deformation at the intended location, and prevents unpredictable cracking or damage during bending, thereby reducing the risk of connection member failure
Data Source
AI summary
A rechargeable battery includes a battery core and a connection member. The connection member includes a guide plate and a first connecting plate integrally formed on the guide plate and connected to a tab of the battery core. The first connecting plate is disposed in a bendable manner relative to the guide plate, and at least one indentation is present between the first connecting plate and the guide plate. The tab extends from a side of a core body of the battery core in a width direction. At least a portion of the guide plate protrudes, relative to the first connecting plate, towards the core body of the battery core to form a protrusion, and the protrusion abuts against the battery core.