Inside (ONE) Our Next Energy's New Michigan Factory!
Munro Live・2 minutes read
The pre-production line in Warren, Michigan creates lithium iron phosphate cells for automotive applications, sourcing North American materials and operating on a small scale for qualification. The production process involves vacuum drying, cooling, expanding to 800 volts, and thorough testing to ensure quality and safety.
Insights
- The pre-production line for Michigan-made cells in Warren, Michigan has a capacity of 20 Gatt hours over three years, focusing on sourcing North American materials for lithium iron phosphate cells and utilizing a pilot factory to test new materials and suppliers before full-scale production.
- The production process involves intricate steps such as coating cathode and anode materials on foils, managing cell expansion with compliance layers, and implementing cooling mechanisms for fast charging, highlighting the complexity and attention to detail required in manufacturing automotive lithium-ion cells.
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Recent questions
How are lithium iron phosphate cells produced?
The process begins with mixing cathode materials, coating them on aluminum foil to create electrodes, then coating anode material on copper foil, drying, calendaring, and stacking electrodes with separators to build lithium-ion cells.
What is the purpose of the pilot factory?
The pilot factory operates on a smaller scale to qualify new materials and suppliers before full production of prismatic metal cans for automotive applications.
How is expansion managed during cycling?
Compliance layers are used to handle cell swelling, designed to manage up to 0.5 mm of expansion per cell during cycling.
What is crucial for fast charging in battery packs?
Cooling is crucial, with cells mounted onto cold plates to dissipate heat, especially during fast charging from 10% to 80% in 12 minutes.
How is the voltage increased to 800 volts?
Transitioning to 800 volts involves doubling the number of cells in the battery pack to 240 cells, adjusting cell thickness for higher voltage, and using equipment capable of producing various cell sizes.
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