Secondary Battery Metal Interlayer for Electrode Module Restraint
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Solution Overview
Problem
Existing secondary batteries face challenges in restraining the movement of the electrode laminated body within the exterior member due to vibrations, which can cause damage, and conventional methods to increase friction may affect the electrode's surface processing, such as corrosion prevention and sealing strength.
Innovation Solution
Incorporating a metal member with higher surface hardness and roughness between the electrode module and the exterior member, such as a stainless steel foil with polishing processed layers and surface hardening layers, to increase friction forces without affecting the electrode's surface processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If surface processing is performed on the outer surface of the electrode laminated body to increase friction coefficient, then movement of the electrode laminated body can be restrained, but corrosion prevention processing and sealing strength are affected
Solution Approach 1:
A resin layer is introduced as an intermediary between the outer surface of the electrode laminated body and the inner surface of the laminate film exterior member. This resin layer has a friction coefficient of 0.3 or more, which is higher than the processed Al surface, and effectively restrains movement of the electrode laminated body without requiring surface processing that would compromise corrosion prevention and sealing strength.
2Force
If processing is performed on the Al surface to increase friction force, then movement restraint is improved, but the electrification function of the principal surface may be disturbed
Solution Approach 1:
The resin layer serves as a mediator that provides the necessary friction force to restrain movement of the electrode module, while the principal surface of the end part current collector body remains unprocessed and maintains its electrification function. The resin layer is applied only to the outer surface where friction is needed, leaving the principal surface intact.
3Force
If the outer surface of the electrode laminated body is processed to increase roughness, then friction resistance is improved, but surface integrity and corrosion prevention are compromised
Solution Approach 1:
Instead of processing the outer surface of the electrode laminated body to increase roughness, a resin layer with inherently high friction coefficient (0.3 or more) is applied as an intermediary. This approach provides the necessary friction resistance while preserving the surface integrity and corrosion prevention properties of the original electrode surface.
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
Effectively restrains the movement of the electrode module within the exterior member, enhancing static friction resistance while preserving the electrode's electrification function and surface integrity.
Implementation Method 1
the metal member that is higher in surface hardness and greater in surface roughness than an outer surface at both ends of the electrode laminated body of the electrode module in a laminating direction and an inner surface of the exterior member, the metal member being provided between the electrode module and the exterior member
Data Source
AI summary
A secondary battery has: an electrode module including an electrode laminated body having a plurality of positive electrode layers and a plurality of negative electrode layers laminated via a separator; an exterior member encasing the electrode module; and a metal member that is higher in surface hardness and greater in surface roughness than an outer surface at both ends of the electrode laminated body of the electrode module in a laminating direction and an inner surface of the exterior member, the metal member being provided between the electrode module and the exterior member.