Bent Strip Terminal Layout for Compact Secondary Batteries
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Solution Overview
Problem
Existing methods to reduce the size and thickness of secondary batteries compromise safety and energy density due to inefficient use of internal space and potential damage from sagging strip terminals.
Innovation Solution
A secondary battery design with a strip terminal bent at an angle of 90 degrees or less, and a manufacturing device using a bending roller to achieve this, minimizing internal space and reducing sagging risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of materials (substrates, separators, external materials) is reduced to make batteries smaller and thinner, then the size and thickness of the battery are reduced, but the safety of the battery deteriorates
Solution Approach 1:
The strip terminal is bent into a three-dimensional configuration with a first section extending in the first direction and a second section bent in a second direction intersecting the first direction, creating an angular structure that utilizes spatial dimensions more efficiently. This dimensional change allows the terminal to achieve compactness without compromising structural integrity or safety functions.
2Ease of manufacture
If conventional strip terminal configurations are used, then manufacturing is simpler, but internal space is wasted and energy density is reduced
Solution Approach 1:
The strip terminal's geometric parameters are changed by bending it at an angle to form intersecting sections. This parameter change optimizes the terminal's spatial occupation, minimizing dead space and maximizing the volume available for active materials, thereby improving energy density while remaining manufacturable.
3Device complexity
If straight strip terminals are used, then the structure is simpler, but sagging occurs causing damage to the electrode assembly and reducing safety
Solution Approach 1:
The strip terminal is curved or bent into an angular configuration with intersecting sections rather than remaining straight. This curvature provides structural rigidity that prevents sagging during battery operation, protecting the electrode assembly from damage while maintaining a relatively simple manufacturing process.
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
Maximizes energy density and enhances safety by optimizing internal space utilization and reducing damage to the electrode assembly.
Implementation Method 1
a bending roller configured to bend the second section connected to the first section of the strip terminal by moving up and down in the first direction along a rear side of the lower jig
Data Source
AI summary
A secondary battery includes an electrode assembly include a side that extends in a first direction, a case accommodating the electrode assembly, a lead tab protruding from the side of the electrode assembly, and a strip terminal connected to the lead tab. The lead tab is bent in the first direction. The strip terminal includes a first section connected to the lead tab and extending in the first direction, and a second section connected to the first section and bent in a second direction that intersects the first direction. An angle between the first section and the second section is 90 degrees or less.