Press Roll Spacing Control for Battery Unit Cell Bonding
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Solution Overview
Problem
The existing pressing roll devices for manufacturing secondary battery unit cells face challenges in maintaining a constant distance between rolls due to mechanical vibrations and impacts, leading to potential damage or deformation of electrodes and separators, and result in inconsistent pressure application affecting bonding quality.
Innovation Solution
A pressing roll device with an adjustable stopper mechanism between the upper and lower mounts, allowing for controlled spacing and self-weight pressure application, along with a damping member to mitigate impacts, ensures consistent pressure and minimizes electrode damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the upper roll and lower roll are spaced apart to minimize electrode and separator damage, then the risk of damage is reduced, but the pressing pressure is reduced deteriorating bonding force
Solution Approach 1:
The upper mount is designed to be movable vertically within a bracket, allowing the pressing roll device to dynamically adjust the distance between upper and lower rolls. This enables the system to maintain optimal spacing that prevents electrode and separator damage while still applying sufficient pressing pressure for bonding.
2Stress or pressure
If mechanical devices are used to maintain constant distance between rolls, then pressing pressure can be controlled, but vibration and impact cause difficulty in maintaining constant distance
Solution Approach 1:
The system uses the self-weight of the upper mount and upper roll to automatically maintain consistent pressing pressure. This self-regulating mechanism eliminates the need for complex mechanical devices that generate vibration and impact, while still ensuring constant distance and pressure application during the pressing process.
3Length of moving object
If the upper mount is allowed to move freely to adjust distance, then the distance can be optimized, but impact occurs when the upper mount seats on the stopper
Solution Approach 1:
A damping member is installed on the stopper to cushion the impact that occurs when the upper mount seats on the stopper. This damping element absorbs the shock energy, preventing damage to the electrode and separator while still allowing the upper mount to move to the optimal position.
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 solution effectively maintains a consistent distance between the rolls, reduces the risk of electrode damage, and allows for adjustable pressure application, enhancing the bonding quality of unit cells during the manufacturing process.
Implementation Method 1
a pressing roll device with an adjustable stopper mechanism between the upper and lower mounts, allowing for controlled spacing and self-weight pressure application
Implementation Method 2
along with a damping member to mitigate impacts
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
A pressing roll device, in which a unit cell passes between an upper roll and a lower roll, according to the present invention comprises: the lower roll; the upper roll; a lower mount on which the lower roll is mounted and which is fixed in movement; an upper mount on which the upper roll is mounted and which is restricted by a bracket so as to ascend and descend by the bracket; and a stopper disposed between the lower mount and the upper mount so that the lower roll and the upper roll are spaced apart from each other. A pressing method, in which a unit cell passes to be pressed between an upper roll and a lower roll, according to the present invention comprises: a step of allowing the unit cell to pass between the lower roll mounted on a lower mount that is fixed in movement and the upper roll mounted on an upper mount which is capable of ascending and descending in a state in which separation from the bracket is restricted, wherein, when the unit cell passes between the upper roll and the lower roll, the upper roll and the lower roll are spaced a predetermined distance from each other.