Rivet Insert Hardness Reduces Conductive Member Thickness
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Solution Overview
Problem
The existing electric storage devices face an issue where the thickness of conductive members increases due to the swaging of rivet members, which affects the energy density per volume and is a problem not only for battery cells but also for capacitors.
Innovation Solution
The electric storage device incorporates a rivet member with an insert part that has higher Vickers hardness than the peripheral region of the conductive member, allowing the insert part to compress and deform the conductive member when swaged, thereby reducing its thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rivet member is swaged to connect the conductive member, then the connection strength is improved, but the thickness of the conductive member increases
Solution Approach 1:
The insert part of the rivet member is designed with higher Vickers hardness than the conductive member, creating a localized hardness difference. This allows the insert part to compress and deform the conductive member's insert-receiving part during swaging, reducing its thickness while maintaining connection strength. The localized property change (hardness difference) enables the contradiction resolution.
Solution Approach 2:
The invention changes the physical parameter of hardness by making the insert part harder than the conductive member. This parameter change allows the insert part to actively compress the conductive member during the swaging process, transforming the passive deformation into active thickness reduction while maintaining the connection function.
2Quantity of substance
If the conductive member thickness is reduced to improve energy density, then the energy density per volume is improved, but the connection reliability may deteriorate
Solution Approach 1:
The insert part is designed with locally higher hardness to actively compress the conductive member during swaging. This localized hardness difference ensures reliable connection even when the overall conductive member thickness is reduced, maintaining connection reliability while improving energy density.
Solution Approach 2:
The rivet member uses a composite structure with the insert part made of a harder material than the conductive member. This material composition difference enables the insert part to deform the conductive member and reduce its thickness while maintaining secure electrical connection, thus improving energy density without sacrificing reliability.
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 configuration effectively suppresses the increase in thickness of the conductive members, enhancing the energy density per volume of the electric storage device.
Implementation Method 1
the insert part has a higher Vickers hardness than a peripheral region of the insert-receiving part of the conductive member
Implementation Method 2
the insert part includes, at a distal end of the insert part, a swaged part that is swaged while the insert part is inserted through the conductive member
Data Source
AI summary
Provided is an electric storage device and an electric storage apparatus capable of suppressing an increase in thickness of a conductive member due to a rivet member being swaged. The present invention includes a rivet member provided with an insert part, and a conductive member provided with an insert-receiving part through which the insert part is inserted. The insert part has a higher Vickers hardness than the peripheral region of the insert-receiving part.