Electrode Assembly Wrapping with Segmented Sealing Bars
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Solution Overview
Problem
Existing electrode assembly wrapping methods fail to effectively suppress bending and swelling phenomena, and cause wrinkles or damage during the wrapping process of battery cells.
Innovation Solution
An electrode assembly wrapping device and method using a lower and upper stage with sealing bars and side sealing blocks, applying negative pressure and adjustable spacing, along with an adhesive film layer activated by heating, to securely attach films to the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive tape is wrapped around the electrode assembly to bind battery cells, then the battery cells are bound together, but the bending and swelling phenomena cannot be suppressed
Solution Approach 1:
The wrapping film is divided into multiple segments (first wrapping film and second wrapping film) that wrap around the electrode assembly in different directions. The sealing bars are also segmented and distributed at different positions to provide localized sealing and fixing forces, preventing both bending and swelling phenomena through distributed constraint.
Solution Approach 2:
The invention transitions from one-dimensional tape wrapping to three-dimensional film wrapping that encloses the electrode assembly from multiple directions. The film wraps around the assembly in a manner that provides constraint in radial, axial, and circumferential directions simultaneously, effectively suppressing bending and swelling in all dimensions.
2Stability of the object's composition
If wrapping is performed to secure battery cells in fixed state, then cells are fixed, but wrinkles occur on film surface or damage to battery cells
Solution Approach 1:
The electrode assembly is positioned on the lower stage with proper alignment before the wrapping process begins. The sealing bars are pre-positioned at optimal locations, and the film is pre-fed into the wrapping mechanism, ensuring that the assembly is already in the correct state before constriction occurs, thereby preventing wrinkles and damage.
Solution Approach 2:
The lower stage acts as an intermediary support structure that holds the electrode assembly during the wrapping process. The sealing bars serve as intermediaries that distribute the wrapping force uniformly across the film and assembly, preventing concentrated stress that would cause wrinkles or cell damage.
3Strength
If sealing bars are used to attach film to electrode assembly, then film adhesion is achieved, but uniform compressive force and stable adhesion require precise control
Solution Approach 1:
The sealing bars are distributed at different local positions around the electrode assembly, with each bar providing localized sealing and compressive force. The spacing and positioning of individual sealing bars are optimized for their specific locations to ensure uniform overall compression while accounting for local variations in assembly geometry and film tension.
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 method prevents wrinkles and ensures firm fixation of battery cells, resisting bending and swelling, with uniform compressive force and stable adhesion.
Implementation Method 1
the side sealing block may form a suction hole on the sealing surface
Implementation Method 2
an adhesive film layer activated by heating
Data Source
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AI summary
An electrode assembly wrapping device includes a lower stage having a plurality of sealing bars on an upper surface and movable up and down, a pair of side sealing blocks disposed on both sides of the lower stage and movable forward and backward with respect to the lower stage, and an upper stage having a plurality of sealing bars on a lower surface and disposed on top of the lower stage and movable up and down with respect to the lower stage.