Electrode Plate Winding Box With Nitrogen and Temperature Control
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Solution Overview
Problem
During the winding and unwinding process of lithium-replenished electrode plates, the replenished lithium reacts with air, generating excessive heat and posing safety hazards and quality degradation issues due to uncontrolled temperature and oxygen concentration.
Innovation Solution
A winding and unwinding system equipped with a cooling unit, temperature sensors, gas detectors, and a control unit that regulates temperature and oxygen concentration within specific thresholds to prevent degradation and ensure safety, including features like thermal insulation, pass rollers, fire control, and hydrogen suction to manage environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrode plate undergoes winding or unwinding operation after lithium replenishment, then the electrode plate can be processed and prepared for battery assembly, but the replenished lithium reacts with air generating excessive heat causing temperature to rise uncontrollably and creating safety hazards
Solution Approach 1:
The patent applies inert atmosphere by filling the winding and unwinding box with nitrogen gas to replace air. The nitrogen concentration is maintained above 95% to prevent the replenished lithium from reacting with oxygen in the air. This resolves the contradiction by allowing the electrode plate to be wound or unwound (maintaining productivity) while the inert nitrogen environment prevents exothermic reactions (controlling temperature).
Solution Approach 2:
The patent introduces nitrogen gas as an intermediary substance between the replenished lithium and air. The nitrogen acts as a protective medium that allows the winding/unwinding operation to proceed while preventing direct contact between the reactive lithium and oxygen. This mediator approach enables both productive operation and temperature control.
2Productivity
If the electrode plate is wound or unwound after lithium replenishment, then the electrode plate can be prepared for battery assembly, but the oxygen concentration inside the box increases causing quality degradation and safety hazards
Solution Approach 1:
The patent maintains an inert atmosphere by controlling the gas composition inside the winding and unwinding box. Nitrogen gas is used to displace air, and the oxygen concentration is kept below 5% (preferably below 1%) throughout the winding and unwinding process. This allows productive operation while preventing oxygen-related quality degradation and safety issues.
Solution Approach 2:
The patent employs oxygen concentration detection and feedback control. Sensors continuously monitor the oxygen level inside the box, and the system adjusts gas flow to maintain oxygen concentration below critical thresholds. This feedback mechanism ensures that productivity is maintained while oxygen concentration is kept at safe and quality-preserving levels.
3Quantity of substance
If the replenished lithium reacts with air during winding or unwinding, then oxygen is consumed and heat is generated, but this reaction causes excessive temperature rise and creates fire hazards
Solution Approach 1:
The patent prevents the harmful reaction by maintaining an inert nitrogen atmosphere instead of allowing air contact. The nitrogen environment eliminates oxygen, so the exothermic reaction between lithium and oxygen cannot occur. This resolves the contradiction by preventing both oxygen consumption and the associated fire hazard through environmental control.
Solution Approach 2:
The patent applies preliminary anti-action by pre-filling the winding and unwinding box with nitrogen gas before the electrode plate is processed. This preemptive measure prevents the harmful lithium-air reaction from occurring in the first place, rather than attempting to control or mitigate it after it starts. The inert atmosphere is established beforehand to counteract the potential harmful reaction.
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 system effectively maintains electrode plate quality and safety by controlling temperature and oxygen levels, preventing overheating and fires, and reducing flammable gas concentrations, thus ensuring the production process is safe and efficient.
Implementation Method 1
a cooling unit configured to supply cooling gas into the box space in a forced convection manner
Implementation Method 2
the cooling gas has a specific heat capacity of greater than or equal to 1.0 kJ/(kg·K)
Data Source
AI summary
A winding and unwinding system for electrode plate includes a winding and unwinding box, a cooling unit, and a control unit. The winding and unwinding box includes a box body and a box door jointly defining a box space, an electrode plate discharge port provided on a side of the box body, a rotating shaft provided in the middle of the box space, an electrode plate cylinder connected to and driven by the rotating shaft, a first temperature sensor monitoring temperature of the electrode plate, a first gas detector monitoring oxygen concentration inside the winding and unwinding box, gas inlet and outlets located at bottom and top of the box body, respectively. The cooling unit communicates with the gas inlet. The control unit controls the cooling unit to regulate the temperature of the electrode plate and the oxygen concentration inside the winding and unwinding box.