Laminated Li-Ion Battery Assembly With Pre-Wetting and Image Alignment
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Solution Overview
Problem
Existing battery manufacturing processes lack visual confirmation of the interface state between electrodes and electrolyte solution impregnation, particularly with thinner separators, leading to deformation and increased risk of short circuits.
Innovation Solution
A battery manufacturing device with an application unit for applying electrolyte solution and a bonding unit with image processing for precise positioning and bonding, enabling visual confirmation and stable interface formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the separator is made thinner to improve battery capacity, then the energy density increases, but the separator becomes easily deformed and risks bending and wrinkling during electrolyte solution impregnation
Solution Approach 1:
The electrolyte solution is applied to the electrode bodies before stacking with the separator. This preliminary impregnation ensures the electrode bodies are saturated with electrolyte solution beforehand, eliminating the need for subsequent impregnation through the separator that could cause deformation of thin separators.
Solution Approach 2:
The conventional process stacks electrodes and separator first, then impregnates with electrolyte solution. This invention inverts the sequence by applying electrolyte solution to electrodes before stacking, fundamentally changing the process flow to protect thin separators from deformation.
2Productivity
If the electrolyte solution is impregnated after stacking the electrode bodies and separator, then the assembly is complete, but the interface state and impregnation state cannot be visually confirmed from the outside
Solution Approach 1:
The electrolyte solution application and interface formation are performed before final assembly and sealing. This allows visual confirmation and quality inspection of the interface state while the battery structure is still open and accessible, before productivity-critical sealing operations commence.
3Quantity of substance
If thin separators are used to improve battery capacity, then the energy density increases, but the risk of short circuits due to deformation increases
Solution Approach 1:
By applying electrolyte solution to electrode bodies before stacking with the separator, the electrode bodies are pre-saturated. This eliminates the need for post-stack impregnation that requires compressing and deforming thin separators, thereby maintaining separator integrity and preventing short circuits while still achieving high battery capacity.
Solution Approach 2:
Inverting the process sequence to apply electrolyte before stacking protects thin separators from deformation-induced short circuits, enabling safe use of thin separators for high-capacity batteries.
Data Source
Figure 1
Figure 2A~2E
Figure 3A~3E
AI summary
Provided with a manufacturing device of a laminated non-aqueous electrolyte secondary battery. Provided with a battery manufacturing device including an application unit (1300) configured to apply an electrolyte solution to an electrode body (1020) formed by supplying an electrode composition containing an electrode active material to a substrate (1010); and a bonding unit (1400) configured to bond a separator (1030) with the electrode body (1020) to which the electrolyte solution is applied, wherein the bonding unit (1400) has a positioning function achieved by an image processing.