Series Battery Partition Plate Structure for Thin Sealed Cavities
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Solution Overview
Problem
The existing method for increasing the operating voltage of lithium-ion batteries by connecting two electrode assemblies in series is hindered by thick partition plates that affect energy density and sealing reliability due to excessive internal stress and folding issues.
Innovation Solution
A partition plate design with a thin partition layer and bonding layers on both surfaces, forming airtight seals with flanges to create independent cavities, reducing the thickness of the seal edge and folding stress, thereby enhancing energy density and sealing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick partition plate is used to connect two electrode assemblies in series, then sealing reliability is improved, but energy density is reduced due to excessive space occupation
Solution Approach 1:
The partition plate is designed as a thin-film structure with a first packaging body, a second packaging body, and a sealing layer. This thin-film approach reduces the thickness and space occupation of the partition plate while maintaining sealing functionality through the sealing layer that hermetically connects the two packaging bodies.
2Reliability
If a thick partition plate is used for hermetic connection, then sealing reliability is improved, but internal stress becomes excessive causing folding issues
Solution Approach 1:
The partition plate adopts a thin-film structure that inherently reduces internal stress compared to thick partition plates. The sealing layer is designed to provide hermetic connection without requiring excessive thickness, thereby avoiding folding issues caused by high internal stress while maintaining sealing reliability.
Solution Approach 2:
The partition plate is segmented into distinct functional layers: a first packaging body, a second packaging body, and a sealing layer. This segmentation allows each layer to perform its specific function optimally, with the sealing layer dedicated to hermetic connection and the packaging bodies providing structural support, thereby reducing overall internal stress.
3Stability of the object's composition
If a thick partition plate is used, then structural stability is improved, but the thickness of the seal edge increases reducing folding capability
Solution Approach 1:
The partition plate is designed as a thin-film structure with reduced overall thickness. The sealing layer provides hermetic connection between the first and second packaging bodies without adding excessive thickness to the seal edge, thereby maintaining folding capability while ensuring structural stability through the layered configuration.
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 partition plate design increases energy density and improves sealing reliability by minimizing the thickness of the seal edge and reducing internal stress, ensuring effective electrical energy output and safety performance.
Implementation Method 1
a hot sealing manner provided in this application can reduce a thickness of a seal edge, and further reduce a folding stress of the seal edge
Data Source
AI summary
An electrochemical device includes a packaging shell having a first packaging body provided with a first dent and a first flange connected to a sidewall of the first dent, and a second packaging body provided with a second dent and a second flange connected to a sidewall of the second dent; a first electrode assembly disposed in the first dent; a second electrode assembly disposed in the second dent; and a partition plate including a partition layer and a first bonding layer located on a first surface of the partition layer. The partition plate is located between the first packaging body and the second packaging body. The flange overlaps the partition plate and extends beyond an edge of the partition plate. The partition plate fits with the first packaging body and the second packaging body to form mutually independent cavities on two sides of the partition plate.