Secondary Battery Electrode Support Structure for Short-Circuit Prevention
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Solution Overview
Problem
Existing secondary batteries face safety hazards due to structural instability, particularly during manufacturing, leading to internal short circuits and poor manufacturability, primarily caused by overhang parts of electrode plates that break and expose internal metal under external forces.
Innovation Solution
A secondary battery design featuring insulating support parts with filling and covering components that fill gaps between electrode plate extensions, enhancing structural stability and preventing metal exposure, combined with a preparation method that includes stacking, filling with a polymer-containing slurry, and compression treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode plates are stacked with extension parts to improve volumetric energy density, then the battery capacity increases, but the structural stability deteriorates causing safety hazards
Solution Approach 1:
An insulating support part is introduced as an intermediary component between adjacent extension parts of electrode plates. This support part includes a filling portion that fills gaps between extension parts and a covering portion that covers the end surface, preventing direct contact and maintaining structural stability while allowing the extension parts to exist for improved volumetric energy density.
Solution Approach 2:
The insulating support part is placed beforehand between extension parts to prevent potential short circuits and structural failures. By pre-positioning this protective component, the design anticipates and prevents the harmful effects of extension part contact under external forces, ensuring safety while maintaining the high-density stacking configuration.
2Quantity of substance
If extension parts are used to increase battery capacity, then volumetric energy density improves, but manufacturing precision deteriorates due to breakage and metal exposure
Solution Approach 1:
The insulating support part serves as a protective intermediary that prevents direct contact between extension parts during manufacturing and operation. This support structure eliminates the risk of metal exposure and short circuits, thereby improving manufacturing precision and reliability while maintaining the extension part configuration for enhanced battery capacity.
Solution Approach 2:
By pre-installing the insulating support part between extension parts, the design provides beforehand protection against manufacturing defects such as breakage and metal exposure. This preventive measure ensures that even if extension parts are subjected to external forces during manufacturing, the insulating support part will prevent harmful contact, thereby improving manufacturability.
3Reliability
If insulating support part is added to improve safety, then structural stability improves, but device complexity increases
Solution Approach 1:
The insulating support part is designed as a thin film or sheet structure with filling and covering portions. This thin-film approach provides the necessary insulation and structural support while minimizing the added complexity and volume, allowing safety improvements without significantly increasing device complexity.
Solution Approach 2:
The insulating support part performs multiple functions simultaneously: it provides electrical insulation between extension parts, maintains structural stability, prevents metal exposure, and supports the electrode plate stacking configuration. By consolidating these functions into a single component, the design improves safety without proportionally increasing device complexity.
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
The design improves battery safety by preventing internal short circuits and structural breakdown, while also increasing volumetric energy density and manufacturability.
Implementation Method 1
a polymer-containing slurry is filled into the gap part and the end part of the extension part to form an insulating support part
Implementation Method 2
the filling part fills the gap part and the covering part covers an end part of the extension part
Implementation Method 3
The compression treatment includes: applying pressure to each surface of the stacked body on which the insulating support part is formed, under a pressure greater than 0 Mpa and less than or equal to 1000 Mpa
Data Source
AI summary
A secondary battery and a preparation method therefor are described. The secondary battery comprises a first electrode sheet, a second electrode sheet, and an insulating support part, wherein the first electrode sheet and the second electrode sheet are alternately stacked in a first direction to form a stack; the first electrode sheet is provided with extension parts extending outwards compared with the second electrode sheet, gap parts being formed between adjacent extension parts in the first direction; and the insulating support part comprises filling parts and covering parts, the filling parts filling the gap parts, and the covering parts covering the ends of the extension parts. The secondary battery ensures high safety.