Tilted Mandrel Assembly for Stable Battery Electrode Stacking
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Solution Overview
Problem
The existing mandrel assembly in cell stack manufacturing is prone to bending and misalignment issues when contacting the stacking table, leading to electrode plate detachment and excessive pressure, which results in damage and reduced clamping performance.
Innovation Solution
A mandrel assembly with a moving block, a mandrel mounting part, a hinge part, and an air pressurization system that tilts the mandrel at a predetermined angle, using an air cushion to elastically pressurize the mandrel mounting part and limit its rotation within a specific range, ensuring proper alignment and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mandrel moves down and presses the electrode plates, then the electrode plates are properly stacked and held in position, but the mandrel may bend due to impact with the stacking table edge
Solution Approach 1:
The patent introduces a buffer structure between the mandrel and the stacking table that absorbs impact energy before it reaches the mandrel. This cushioning mechanism prevents the mandrel from bending due to sudden impact while maintaining its pressing function on the electrode plates.
Solution Approach 2:
The patent employs an intermediary buffer element that mediates between the mandrel and the stacking table. This intermediary structure absorbs the shock of impact and transfers it in a controlled manner, protecting the mandrel from direct impact forces that would cause bending.
2Manufacturing precision
If the mandrel moves down excessively beyond the set distance, then the electrode plates are pressed with increased pressure, but mandrel marks occur on the electrode plates
Solution Approach 1:
The patent incorporates a feedback mechanism through the buffer structure that provides resistance proportional to the compression distance. When the mandrel moves down, the buffer compresses and provides increasing counter-pressure, automatically limiting the downward movement and preventing excessive pressure that would cause mandrel marks on the electrode plates.
Solution Approach 2:
The buffer structure provides preliminary anti-action by opposing the downward movement of the mandrel before excessive compression occurs. This pre-established resistance mechanism prevents the mandrel from moving beyond the optimal pressing distance, thereby avoiding mandrel marks on the electrode plates.
3Productivity
If the mandrel bends due to impact, then the mandrel can be used for stacking, but the electrode plates become twisted or detached
Solution Approach 1:
The buffer structure provides beforehand cushioning that prevents mandrel bending in the first place. By absorbing impact energy before it reaches the mandrel, the buffer ensures the mandrel remains straight and maintains proper alignment with the electrode plates throughout the stacking process.
Solution Approach 2:
The buffer acts as an intermediary that protects the mandrel from impact forces. This intermediary structure ensures the mandrel maintains its structural integrity and alignment precision, preventing electrode plate twisting or detachment while allowing continuous stacking operations.
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
Prevents bending and misalignment of the mandrel, maintains stable electrode plate alignment, and reduces the risk of detachment and damage by distributing pressure evenly, enhancing the clamping performance and correcting mechanical assembly tolerances.
Implementation Method 1
a pressurization part configured to elastically pressurize one side of the mandrel mounting part so that the mandrel is tilted at a predetermined angle to an electrode plate
Implementation Method 2
a hinge part configured to rotatably couple the mandrel mounting part to the moving block
Data Source
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AI summary
The present disclosure discloses a mandrel assembly structure for an apparatus for manufacturing a cell stack for a secondary cell, which can prevent an alignment failure of an electrode and damage to the electrode attributable to an assembly tolerance and moving deviation of a mandrel when a cell stack for a secondary cell is manufactured. The mandrel assembly includes a moving block, a mandrel mounting part provided with a mandrel and mounted on the moving block, a hinge part configured to rotatably couple the mandrel mounting part to the moving block, and a pressurization part configured to elastically pressurize one side of the mandrel mounting part so that the mandrel is tilted at a predetermined angle to an electrode plate.