Straight Connecting Piece Secondary Battery Design
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Solution Overview
Problem
Existing secondary battery designs require high bending properties for connecting pieces and tabs, leading to fatigue cracks, increased production costs, and reduced energy density due to complex bending processes.
Innovation Solution
A secondary battery design where connecting pieces are positioned parallel to the cap plate and do not require bending, with tabs welded to tab welding portions and electrode terminals welded to electrode terminal portions, eliminating the need for bending and allowing for increased space and improved production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting piece and tab are bent 180 degrees to form horizontal U-shape, then the electrical connection between electrode terminal and tab is achieved, but the bending property requirement increases and fatigue cracks occur
Solution Approach 1:
Instead of bending the connecting piece and tab to form U-shape for connection, the patent inverts the approach by keeping both components straight and parallel to the cap plate. The connection is achieved through direct welding between the straight connecting piece and straight tab, eliminating the need for bending operations and associated fatigue risks.
2Reliability
If the connecting piece and tab are bent on the main body of the cell, then the electrical connection is achieved, but the operation process increases and production cost increases
Solution Approach 1:
The patent inverts the conventional bending process by using straight connecting pieces and tabs that are welded in their original straight configuration. This eliminates multiple bending operations, reduces process steps, and improves production efficiency while maintaining reliable electrical connections.
3Reliability
If the connecting piece and tab are bent to form horizontal U-shape, then the electrical connection is achieved, but more space is taken and energy density cannot be increased
Solution Approach 1:
The patent inverts the U-shape bending approach by using straight connecting pieces and tabs positioned parallel to the cap plate. This straight configuration occupies less space within the battery assembly, increasing the available volume for active materials and thereby improving energy density while maintaining reliable electrical connections.
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 reduces the risk of fatigue fractures in connecting pieces and tabs, decreases production costs, and enhances energy density by simplifying the manufacturing process and utilizing available space.
Implementation Method 1
Each connecting piece has: a tab welding portion for being welded to the corresponding tab of each cell
Implementation Method 2
an electrode terminal welding portion connected to the tab welding portion along the longitudinal direction of each connecting piece for being welded to the corresponding electrode terminal of the cap plate
Data Source
AI summary
The invention provides a secondary battery which comprises a cap plate and at least one cell. The secondary battery further comprises connecting pieces, each connecting piece is parallel to the cap plate and positioned at an inside of the cap plate in a thickness direction of the cap plate, a longitudinal direction of each connecting piece is parallel to a length direction of the cap plate, a transverse direction of each connecting piece is parallel to a width direction of the cap plate. Each connecting piece has: a tab welding portion for being welded to the corresponding tab of each cell; and an electrode terminal welding portion connected to the tab welding portion along the longitudinal direction of each connecting piece for being welded to the corresponding electrode terminal of the cap plate so as to electrically connect the corresponding electrode terminal and the corresponding tab of each cell.