Rectangular Battery Insulator Vibration Isolation
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Solution Overview
Problem
Conventional hermetically-sealed lithium-ion secondary batteries face issues with vibrations and impacts affecting the hermetical-sealing property due to the transmission of forces through the current collecting plate and gasket, leading to potential malfunction and safety concerns.
Innovation Solution
A rectangular secondary battery design featuring a flat-shaped electrode group, a current-collecting plate, a battery case, a battery cover with an electrode terminal connected via a connecting member, and a gasket for insulation and sealing, with an insulator between the current-collecting plate and the battery cover to absorb and distribute vibrations and impacts, preventing their transmission to the gasket and maintaining hermetical-sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collecting plate is fixed to the battery case through welding of the fragile part and the diaphragm, then the current path is established, but vibrations and impacts applied to the current collecting plate are transmitted to the welding part and may lead to malfunction
Solution Approach 1:
The patent introduces an insulator as an intermediary component between the current collecting plate and the battery case. This insulator serves as a mediator that prevents direct mechanical coupling, thereby blocking the transmission of vibrations and impacts to the welding part while still allowing electrical connection through the fragile part and diaphragm assembly.
Solution Approach 2:
The patent divides the fixing structure into separate functional components: the insulator, the fragile part, and the diaphragm. By segmenting the current collecting plate fixation system, the patent isolates the welding part from vibration transmission paths while maintaining electrical connectivity through the segmented assembly.
2Strength
If the connecting shaft of the external connecting terminal is inserted into the opening hole of the cover and fixed by caulking, then the terminal is secured, but vibrations and impacts are transmitted to the gasket and affect the hermetical-sealing property
Solution Approach 1:
The patent introduces an insulator as an intermediary component between the current collecting plate and the battery case. This insulator serves as a mediator that prevents direct mechanical coupling, thereby blocking the transmission of vibrations and impacts to the welding part while still allowing electrical connection through the fragile part and diaphragm assembly.
Solution Approach 2:
The patent positions the insulator in advance between the current collecting plate and the battery case to provide cushioning against vibration transmission. This pre-positioned insulator acts as a protective buffer that absorbs and isolates mechanical shocks before they can reach the gasket and compromise the hermetical seal.
Data Source
AI summary
Provided is a rectangular secondary battery with improved rigidity against vibrations and impacts. A rectangular secondary battery of the present invention includes: a flat-shaped electrode group; a current-collecting plate electrically connected to the electrode group; a battery case accommodating the current-collecting plate and the electrode group; a battery cover that closes an opening of the battery case; an electrode terminal penetrating through the battery cover, the electrode terminal being connected to the current-collecting plate via a connecting member; and a gasket that is inserted between the electrode terminal and the battery cover for insulating and sealing. An insulator is disposed between the current-collecting plate and the battery cover, the battery cover includes a battery cover side fixing part that fixes the insulator, and the insulator includes a current-collecting plate side fixing part that fixes the current-collecting plate.