Secondary Battery Insulating Support for Structural Stability
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Solution Overview
Problem
Current secondary batteries face safety hazards due to structural instability, particularly from overhang parts causing electrode plate breakage and internal short circuits during external forces, leading to poor manufacturability and safety issues.
Innovation Solution
A secondary battery design with insulating support parts that include a filling part to fill gaps between electrode plate extensions and a covering part to cover the end parts, using polymers with a glass transition temperature of -30 °C to 200 °C, and a compression treatment under 0 to 1000 Mpa pressure to enhance structural stability.
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 electrode plate breakage and internal short circuits
Solution Approach 1:
An insulating support part is introduced as an intermediary element between adjacent extension parts of electrode plates. This support part includes a filling portion that fills the gap between extension parts and a covering portion that covers the end surface, preventing direct contact and structural instability while maintaining high volumetric energy density
Solution Approach 2:
The insulating support part is pre-installed on extension parts before final battery assembly and compression. This beforehand cushioning prevents potential breakage and short circuits by providing structural support and insulation in advance, addressing the stability issue before it can manifest during battery operation or external force application
2Reliability
If compression treatment is applied to enhance structural stability, then the safety improves, but the manufacturing complexity increases
Solution Approach 1:
The insulating support part is installed on extension parts before the compression treatment step. This preliminary action ensures that the support structure is in place to withstand the compression force, enabling the safety improvement without requiring complex in-situ support mechanisms during compression
3Reliability
If insulating support parts are added to prevent short circuits, then the safety improves, but the device complexity increases
Solution Approach 1:
The insulating support part integrates multiple functions into a single component: it provides electrical insulation between adjacent electrode plates, mechanical support to prevent breakage, and structural filling to maintain compact arrangement. This merging reduces the need for multiple separate components, limiting the increase in device complexity while achieving comprehensive safety improvement
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 structural stability, prevents internal short circuits, and enhances safety, enabling high volumetric energy density and manufacturability of solid-state batteries.
Implementation Method 1
the filling part fills the gap part and the covering part covers an end part of the extension part
Implementation Method 2
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
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AI summary
Provided in the present application are a secondary battery and a preparation method therefor. 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 of the present application ensures high safety.