Secondary Battery Insulation Case Electrolyte Permeation
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Solution Overview
Problem
Lithium secondary batteries face increased manufacturing time due to slow electrolyte permeation through the electrode assembly, as existing designs typically inject electrolyte through a single hole, leading to delayed permeation on the opposite surface and reduced efficiency.
Innovation Solution
The design incorporates an insulation case with projections that create a separating space between the insulation case and the can, allowing electrolyte to permeate through both surfaces of the electrode assembly, enhancing permeation speed by forming electrolyte passing regions outside the insulation case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electrolyte is injected through a single hole, then the injection structure is simple, but the electrolyte permeation speed through the electrode assembly is slow
Solution Approach 1:
The patent divides the single injection point into multiple injection holes distributed across the cap assembly. This segmentation allows electrolyte to enter through multiple locations simultaneously, significantly increasing the permeation speed through the electrode assembly while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent transitions from a single-point (0D) injection to a distributed multi-point (1D/2D) injection pattern across the cap assembly surface. This dimensional change enables electrolyte to permeate through multiple pathways concurrently, resolving the contradiction between injection simplicity and permeation speed.
2Loss of time
If electrolyte is injected through one surface, then the injection process is simple, but the permeation to the opposite surface is delayed
Solution Approach 1:
By segmenting the injection system into multiple holes positioned to inject electrolyte from different directions and locations, the patent enables simultaneous permeation through both surfaces of the electrode assembly, eliminating the sequential permeation delay and reducing manufacturing time.
Solution Approach 2:
The multiple injection holes are strategically positioned to create preliminary permeation pathways that reach both surfaces of the electrode assembly simultaneously, preventing the delay that would occur with single-surface injection and thereby improving production efficiency.
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
This design significantly increases electrolyte permeation speed into both surfaces of the electrode assembly, reducing manufacturing time and improving productivity by allowing uniform electrolyte flow through the created passages.
Implementation Method 1
increase the electrolyte permeation speed of an electrode assembly by effectively injecting the electrolyte through the outside of the electrode assembly
Data Source
AI summary
A secondary battery is disclosed. In one embodiment, the secondary battery includes i) an electrode assembly comprising upper and lower surfaces opposing each other, ii) a container configured to receive the electrode assembly via an opening defined at one end thereof, iii) a cap assembly configured to close the opening of the container, wherein an electrolyte injection hole is defined in the cap assembly, and wherein the electrolyte injection hole is configured to receive electrolyte and iv) an insulation case configured to be received by the container and being interposed between the cap assembly and the electrode assembly, wherein a first electrolyte permeation passage is formed between an outer surface of the insulation case and an inner surface of the container, and wherein the first electrolyte permeation passage is configured to expedite the permeation of the received electrolyte into the lower surface of the electrode assembly.