Battery Cell Terminal Rivet Connection for Space-Saving Assembly
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Solution Overview
Problem
Conventional battery cell connection structures occupy space, reducing energy density, are prone to damage during assembly, and complicate the manufacturing process, increasing production costs.
Innovation Solution
A battery cell design featuring a connection pin that inserts into a rivet with a guide groove, allowing for stable and efficient electrical connection between the electrode assembly and terminal, reducing wasted space and simplifying the assembly process by integrating the connection during cap assembly attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection member is used to electrically connect the electrode assembly and electrode terminal, then electrical connection is achieved, but the connection member occupies space reducing energy density
Solution Approach 1:
The patent merges the connection member with the electrode terminal by forming the connection member as an integral part of the terminal structure. The connection member is formed by bending the terminal material itself, eliminating the need for separate connection components and reducing space occupation while maintaining electrical connection reliability.
Solution Approach 2:
The electrode terminal is designed to serve multiple functions: it acts as both the electrical terminal for current collection and as the connection member for electrical connection to the electrode assembly. This multi-functionality eliminates the need for dedicated connection members, thereby saving space and improving energy density.
2Ease of operation
If a thin metal connection member is used to facilitate bending, then ease of connection is improved, but the connection member may be damaged during assembly
Solution Approach 1:
The patent changes the geometric parameters of the connection member by forming it with a specific bent shape that includes a bending radius larger than a predetermined value. This parameter optimization allows the connection member to be sufficiently flexible for easy connection while maintaining adequate strength to prevent damage during assembly processes.
3Reliability
If the connection member is connected before coupling the cap assembly to the housing, then electrical connection is established, but the manufacturing process becomes complicated and production costs increase
Solution Approach 1:
The connection member is pre-formed as an integral part of the electrode terminal during terminal manufacturing, with the bending and shaping completed beforehand. This preliminary action allows the connection to be automatically established when the cap assembly is coupled to the housing, eliminating the need for separate connection steps and simplifying the manufacturing process.
Data Source
AI summary
In some implementations, is provided a battery cell, and battery module and battery pack including the same including: an electrode assembly in which a plurality of polar plates are stacked; a case having an internal space in which the electrode assembly is accommodated; a cap assembly coupled to the case and having a terminal disposed therein; and a connection pin configured to electrically connect the electrode assembly and the terminal, wherein the terminal includes: a rivet having an insertion hole into which the connection pin is inserted; and a terminal portion coupled to the rivet.