Integrated Battery Terminal Reducing Contact Resistance
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Solution Overview
Problem
The existing secondary battery manufacturing process is complicated and has high contact resistance due to the need for multiple connections between the bus bar, terminal base, and current collector, which increases manufacturing complexity and reduces efficiency.
Innovation Solution
The integration of bus bar and current collector joints on the battery lid, with a cylindrical insertion part and sealing mechanism, reduces the number of connections and contact resistance, simplifying the assembly process and improving throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rivet terminal with multiple connection parts is used to electrically connect the bus bar to the generating element, then electrical connection is achieved, but the manufacturing process becomes complicated and contact resistance increases
Solution Approach 1:
The patent merges the terminal base and current collector into a single integrated external terminal component. This eliminates the need for separate rivet terminals and multiple connection parts, directly reducing manufacturing complexity while maintaining reliable electrical connection between the bus bar and generating element through the integrated structure
2Reliability
If multiple connecting parts are used in the connecting passage between the terminal base and current collector, then electrical connection is established, but contact resistance increases due to multiple interfaces
Solution Approach 1:
By integrating the terminal base and current collector into one piece, the patent eliminates multiple connecting interfaces in the electrical path. This single integrated structure reduces the number of contact points, thereby lowering contact resistance and energy loss while maintaining reliable electrical connection
3Reliability
If multiple connection steps are required for assembling the terminal components, then reliable connection is achieved, but productivity decreases
Solution Approach 1:
The integration of terminal base and current collector into a single external terminal component reduces the number of assembly steps. Instead of separately assembling rivet terminals, terminal bases, and current collectors, the integrated design requires fewer assembly operations, directly improving productivity and throughput while maintaining connection reliability through the unified 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
This integrated structure reduces contact resistance and simplifies the manufacturing process, leading to improved assembly efficiency and cost reduction by eliminating unnecessary connections and steps.
Implementation Method 1
The cylindrical insertion part has in its inside a bottom which seals the through hole in the battery lid and has an end which is staked to the current collector
Implementation Method 2
The current collector joint has a sealing part arranged at an outer periphery of the insertion part, the sealing part pressing down a sealing member which seals a gap between the through hole and the insertion part
Data Source
AI summary
A square secondary battery includes a generating element having an electrode; a battery can holding the generating element; a battery lid that seals an opening of the battery can; an external terminal arranged on the battery lid; and a current collector connecting the electrode of the generating element to the external terminal. The external terminal has a bus bar joint to which a bus bar is connected and a current collector joint to which the current collector is connected, the bus bar joint and the current collector joint being integrally juxtaposed on the battery lid. The current collector joint has a cylindrical insertion part to be inserted into a through hole in the battery lid and also has a sealing part arranged at an outer periphery of the insertion part, the sealing part pressing down a sealing member.