Battery Cell Rolled-Edge Sealing for Pressure Resistance
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Solution Overview
Problem
The challenge in battery technology is to enhance the safety and processing efficiency of battery cells while ensuring effective sealing to prevent failure due to internal pressure during charging and discharging processes.
Innovation Solution
A device and method involving a roller moving mechanism that inclines the rolled edge structure of the battery cell by squeezing it with a first roller, accompanied by a stiffener to distribute pressure and improve sealing, and a roller rotating mechanism to uniformly stress and deform the edge structure, enhancing pressure resistance and processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rolled edge structure is made more robust to improve pressure resistance, then safety improves, but processing complexity increases
Solution Approach 1:
The rolled edge structure is pre-formed with an outward turn before the squeezing operation. This preliminary shaping allows the subsequent squeezing process to more effectively incline the edge toward the central axis, improving pressure resistance without requiring excessively complex processing equipment.
Solution Approach 2:
The squeezing operation creates a curved, inclined configuration of the rolled edge structure that conforms to the cylindrical geometry of the battery cell. This curvature allows the edge to better distribute and resist internal pressure forces compared to a flat or sharp edge configuration.
2Reliability
If the rolled edge structure is tightly sealed to improve sealing effect, then safety improves, but manufacturing difficulty increases
Solution Approach 1:
The squeezing operation changes the geometric parameters of the rolled edge structure by inclining it toward the central axis. This parameter change creates a tighter seal between the case and cover plate while using a relatively simple mechanical squeezing process rather than complex sealing mechanisms.
Solution Approach 2:
The rolled edge structure is pre-formed with an outward turn that positions it for optimal sealing. This preliminary configuration reduces the complexity of the subsequent squeezing operation needed to achieve the final sealed state, as the edge is already in a favorable position for creating the seal.
3Productivity
If uniform stress distribution is applied to improve processing efficiency, then productivity improves, but device complexity increases
Solution Approach 1:
The rotating squeezing mechanism applies dynamic, oscillating stress to the rolled edge structure during processing. This vibratory motion helps distribute stress more uniformly throughout the edge structure, improving processing efficiency and preventing localized deformation while using a relatively simple rotating mechanism.
Solution Approach 2:
The rotating squeezing mechanism follows the curved geometry of the cylindrical battery cell, ensuring that stress is applied uniformly around the entire circumference of the rolled edge structure. This rotational approach achieves uniform stress distribution without requiring multiple separate processing stations or complex multi-axis positioning systems.
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 improves the pressure resistance and sealing performance of the battery cell, reducing the risk of failure and increasing processing efficiency by uniformly stressing and deforming the rolled edge structure, thereby enhancing the safety and efficiency of the battery manufacturing process.
Implementation Method 1
the first roller, having a first processing surface and configured to squeeze, when the roller moving mechanism controls the first roller to move in the direction of the central axis of the battery cell, the rolled edge structure by the first processing surface, to cause the rolled edge structure to be inclined in a direction close to the central axis of the battery cell
Implementation Method 2
the device further includes a roller rotating mechanism, configured to control the first roller to rotate about the central axis of the battery cell
Data Source
AI summary
A device and method for manufacturing a battery cell. The device includes: a roller moving mechanism, configured to control a first roller to move in a direction of a central axis of a battery cell, where the battery cell includes a case and a cover plate, the case and the cover plate being hermetically connected and forming a rolled edge structure that is turned outwards; and the first roller, configured to squeeze, when the roller moving mechanism controls the first roller to move in the direction of the central axis of the battery cell, the rolled edge structure by a first processing surface, to cause the rolled edge structure to be inclined in a direction close to the central axis of the battery cell.