Vacuum Roller Electrode-Separator Assembly for High-Throughput Joining
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Solution Overview
Problem
The production of high-capacity battery cells is limited by the speed-determining stack formation process in existing electrode-separator composite (ESV) manufacturing, which requires downtimes for accurate pick-and-place applications, leading to throughput limitations and economic restrictions due to space requirements and material limitations for handling high temperatures and adhesion-promoting pressure loads.
Innovation Solution
A method and device utilizing a vacuum roller with distinct surface areas and a roller nozzle device for precise positioning and adhesive application, allowing for adhesive bonding without heat, enabling efficient and accurate joining of electrodes and separators with mechanical pressure, and independent control of suction and pressure effects for handling electrodes of varying sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pick-and-place applications are used to join electrodes and separators with high precision, then manufacturing precision is improved, but productivity deteriorates due to necessary downtimes in the process flow
Solution Approach 1:
The patent replaces the mechanical pick-and-place system with a continuous transport system where electrodes and separators are conveyed through the device and joined in-line. This substitution eliminates the stop-start nature of pick-and-place operations, allowing continuous production while maintaining precise joining through controlled transport mechanisms and positioning systems.
Solution Approach 2:
The invention implements continuous operation by transporting electrodes and separators through the joining process without interruption. The continuous transport system allows materials to move steadily through the device, enabling uninterrupted joining operations and eliminating the downtime required for reset movements in pick-and-place systems.
2Manufacturing precision
If pick-and-place applications are used to achieve high precision in joining, then manufacturing precision is improved, but loss of time increases due to reset movements taking up non-value-added assembly time
Solution Approach 1:
The patent replaces the cyclic pick-and-place mechanism with a continuous conveyance system. Materials are transported continuously through the joining zone, eliminating the need for reset movements. The precise positioning is achieved through controlled transport and in-line joining rather than repeated pickup and placement cycles.
Solution Approach 2:
The invention maintains continuous useful action by keeping electrodes and separators in constant motion through the device. The joining process occurs during transport without interruption, converting the intermittent action of pick-and-place into continuous operation that eliminates non-value-added reset time.
3Productivity
If hot lamination is used to join electrodes and separators, then productivity is improved through higher speeds and parallelization, but temperature increases requiring materials that can withstand high temperatures and pressure loads
Solution Approach 1:
The patent changes the joining parameters from high-temperature hot lamination to room-temperature adhesive bonding. Instead of heating materials to activate adhesives, the invention uses adhesives that cure at ambient temperatures, eliminating the need for high-temperature processing while maintaining productive joining speeds through continuous operation.
Solution Approach 2:
The invention replaces the thermal field (heating system) with a chemical field (room temperature adhesive curing). This substitution eliminates the temperature increase associated with hot lamination while maintaining the productivity benefits of continuous processing through adhesive-based joining.
4Productivity
If continuous transport and in-line joining is used, then productivity is improved, but device complexity increases due to vacuum roller systems with multiple surface areas
Solution Approach 1:
The vacuum roller is designed with multiple surface areas that perform different functions: one area for conveying the electrode, another for applying adhesive, and a third for releasing the electrode onto the separator. This multi-functional design consolidates multiple operations into a single device, improving productivity without proportionally increasing overall system complexity.
Solution Approach 2:
The invention merges conveying, adhesive application, and release functions into a single vacuum roller component. By combining these operations in one device rather than using separate mechanisms, the system achieves continuous productive operation while keeping the added complexity contained within a single multi-functional element.
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 approach enables high-throughput, time-saving production of electrode-separator composites with high accuracy, reducing the risk of kinks or folds and allowing for the use of room temperature adhesive hardening, thus overcoming throughput limitations and material constraints.
Implementation Method 1
a roller suction device (20) on a roller body (22) of a vacuum roller (5) for holding the electrode (9) on a surface of the roller body (22) by means of suction
Implementation Method 2
an adhesive can be applied to the electrode and/or the separator material in a first surface area
Implementation Method 3
the electrode can be pressed away from the vacuum roller toward the separator material by means of the roller nozzle device to form an adhesive bond
Data Source
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AI summary
The invention relates to a method and a device for producing an electrode-separator assembly for a battery cell. The method comprises the following: feeding a separator material (2) by means of a separator feeding device; feeding an electrode (9; 10) by means of an electrode feeding device; and producing an electrode-separator assembly by means of a joining device, wherein the electrode (9; 10) is joined to the separator material (2) and an adhesive bond is formed between the electrode (9; 10) and the separator material (2).The electrode (9; 10) and the separator material (2) are joined using at least one vacuum roller (5; 6) which is configured to hold the electrode (9; 10) at least for feeding by means of a roller suction device in a first surface area of a roller body of the vacuum roller (5; 6) on the roller body and for joining by means of a roller nozzle device in a second surface area of the roller body, which is different from the first surface area, away from the vacuum roller (5; 6) towards the separator material (2), which is supported for joining by a support device which is arranged opposite the vacuum roller (5; 6).