Square Battery Insulation Structure for Vibration Resistance
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Solution Overview
Problem
Existing square secondary batteries lack reliability due to insufficient insulation between components, leading to potential short-circuits and damage from vibrations or impacts.
Innovation Solution
Incorporating a first insulating member between the collector members and the sealing plate, and a second insulating member between the sealing plate and the electrode body, which are connected to prevent positional displacement and ensure the battery's structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating spacer is disposed between the sealing plate and the electrode body, then insulation is provided, but the insulating spacer may displace positionally under vibration or impact, causing short-circuits or damage
Solution Approach 1:
The patent combines the first insulating member (between collector member and sealing plate) and the second insulating member (between sealing plate and electrode body) into a connected insulating structure. This merging ensures that vibrations or impacts are distributed across both members, preventing the second insulating member from displacing and causing short-circuits, thereby maintaining insulation reliability while improving positional stability.
2Reliability
If a single insulating member is used between the sealing plate and the electrode body, then the structure is simple, but it cannot adequately prevent short-circuits under vibration or impact
Solution Approach 1:
The patent divides the insulating function into two separate members: the first insulating member positioned between the collector member and the sealing plate, and the second insulating member positioned between the sealing plate and the electrode body. This segmentation allows each member to perform its insulation function independently while being connected to work together as a system, providing enhanced short-circuit prevention under vibration or impact without excessive complexity.
3Stability of the object's composition
If the insulating member is not connected to the sealing plate, then the structure is simpler, but the insulating member cannot be effectively fixed, leading to displacement under vibration
Solution Approach 1:
The patent implements preliminary fixing by connecting the first insulating member to the sealing plate before final assembly. This preliminary action ensures that the insulating members are properly positioned and secured in advance, preventing displacement under vibration or impact during subsequent assembly and operation, thereby achieving stable fixation without complex additional structures.
Data Source
AI summary
To provide a square secondary battery with a high reliability.A square secondary battery (20) including an electrode body (3) having a positive electrode plate and a negative electrode plate, a square outer package (1) that includes an opening and that houses the electrode body (3), and a sealing plate (2) that seals the opening of the square outer package (1), in which an inner side insulating member (12) serving as a first insulating member is disposed between the sealing plate (2) and a negative electrode collector member (8) and is fixed to the sealing plate (2), and in which a second insulating member (80) disposed between the sealing plate (2) and the electrode body (3) is connected to the inner side insulating member (12) serving as the first insulating member.