1. Preparation for lithium battery core before baking.
Automatic production technology for lithium battery core baking must be air compressor. Gas holder , Freeze dryer Adsorption dryer, Precision filter Nitrogen making machine.
1. Clean the oven before bake, remove dust and foreign matter in the box and baking clamp, prevent baking and dust entering the core. (using accessories: alcohol and RAG).
2, the core drying process: preparation, commissioning, starting heating, baking, process inspection, filling nitrogen, process records.
3, turn on the main power switch and vacuum valve (vacuum to -90KPA); Ingersoll Rand screw compressor air valve (Ingersoll Rand) Oil-free screw air compressor Row The air pressure is 0.8Mpa, the pressure dew point is -40 degree, and the 100% is oil-free. 99.99 nitrogen making machine )
4, bake open into the main operation interface, manual operation, enter the manual operation interface; display the layer number and the corresponding choice for each layer of oven: heating, vacuum, nitrogen filling; select vacuum, first vacuum oven test, when the vacuum reaches -90KPA, in nitrogen gas, to check the vacuum pumping equipment and nitrogen filling operation is normal.
5, if there is no vacuum and other abnormalities, notify the equipment personnel immediately for maintenance.
6. After confirming the baking qualification, enter the manual operation interface, start the oven heating button, and bake oven to heat.
7, the core should be heated for more than 2 hours before baking, so as to reduce the heating time when the core is placed into the oven.
Two, the lithium battery core baking process:
1. Temperature setting of core baking temperature: 85 + 5 degrees.
2. Vacuum baking parameters of core: vacuum degree less than -90KPA.
3, the core baking time is set at 24-48 hours, and the baking time depends on the size of the core.
4. The nitrogen baking machine for core baking is set up: filling nitrogen for first hours, fourth hours, and seventh hours; nitrogen filling time is more than 2 minutes.
5, small electric core (capacity below 20A) bake: the electric core is placed in the moderate material box, neatly placed, the air bag is upwards, the quantity of each box is about 20EA, and the electric core expansion is required.
6, Zhongda electric core (capacity over 20A) baking: large and medium sized polymer core bake when using the tray and stainless steel plate to place the core, when baking, the core is placed neatly, the number of each layer is less than 8EA; the height of the core should be lower than that of the oven's inner wall 30mm, and the air core bag is stuffed with PET rolls, and the air bag mouth is opened.
7. When the core is placed, fill in the baking status table. Once every 2 hours during the core baking process, the temperature and vacuum degree of the oven are confirmed once, and the inspection record is recorded.
Three. Core baking is completed:
1. After the core is bake, the heating button is closed, the oven is cooled, and the core needs to be kept in vacuum.
2, when the core temperature drops below 35 degrees, the drying room will be transferred into the glove box for liquid addition.
Four. Quality control requirements for lithium battery core baking:
1. During the process of lithium battery core baking, temperature, vacuum degree and baking time should be well controlled.
2. When the lithium battery core is bake, the oven door must not be opened.
3, the electric oven must be special. When baking, it is strictly prohibited to put liquid and its goods to bake with the core.
Five. Cautions for lithium battery core baking:
1, lithium battery core baking process is strictly prohibited from power failure.
2. Nitrogen making machine Nitrogen valve is confirmed when nitrogen is opened, and nitrogen pressure should be confirmed at any time to ensure sufficient nitrogen.
3, nitrogen cylinders should be clearly marked during use and nitrogen usage.