Three Layer Double Door Intelligent High Vacuum Oven 

Ⅰ 、Equipment Overview

1.Equipment function: 

Suitable for baking of lithium-ion battery electrode, cell and battery to be injected with liquid.Double door, including a set of high vacuum system, max drying temperature: 200C,with front and back door open version.

2. Brief description of workflow

Put the electrode into the oven, and then set the heating time, vacuum time and nitrogen time. The system will automatically complete the heating and regular air change according to the set time parameters to complete the baking process.

Ⅱ 、Technical Parameter

1. Vacuum degree: empty chamber vacuum degree ≤ 10pa, full chamber vacuum degree: 50pa-100pa, air leakage rate ≤ 500pa within 24 hours;

2. Heating method: Adopting internal and external dual circulation air, with dual control of internal and external infrared heat sources. The heating method is controlled through thermal radiation, heat conduction, and electric heating;

3. Heating structure: U-shaped circulating air is used, with left air outlet, right air suction, and upper and lower air exhaust to achieve temperature consistency;

4. Cooling method: The cold air system is connected to the external air duct, and alternating conduction cooling is carried out from the external air duct of the chamber:

5. Main heating temperature control: temperature control accuracy within ± 0.5 ℃;

6. Temperature error inside the box: ± 2 ℃ (empty box, constant temperature state);

± 3 ℃ (full load, constant temperature state)

7. Constant temperature range: room temperature:+10 ℃~200 ℃;

8. Heating rate: room temperature~85 ℃ ≤ 30 minutes (under normal pressure and no-load conditions, the time for the instrument to reach the set temperature), and the temperature stability time in the furnace is 60 minutes (empty box); Room temperature~85 ℃ ≤ 45 minutes (full load state, time when the instrument reaches the set temperature), furnace temperature stability time 80-100 minutes (full load);

9. Temperature rise state: The temperature rises in a curve from room temperature to the set value, and remains in a straight line state after constant temperature;

10. Cooling time: ≤ 95 minutes (empty box, 100 ℃~55 ℃, core detection), full load test time ≈ 100min (depending on battery size and capacity)

11. Surface temperature of the box: The temperature inside the furnace is 200 ℃, and the surface temperature is ≤ room temperature+15 ℃;

12. Extreme vacuum degree ≤ 10pa (no-load state), single chamber is pumped from atmospheric pressure to 10pa ≤ 10min (no-load state), vacuum leakage rate (cold machine no-load state): After reaching the extreme vacuum, close the valve and keep it for 1 hour, and the average absolute decrease in vacuum degree is 100pa ≤ 20Pa; Maintain for 24 hours, and the absolute value of vacuum degree decrease is ≤ 500Pa;

13. Using a single pump and multiple chambers arrangement for vacuum pumping; 

The no-load limit vacuum degree is ≤ 10pa, and the vacuum degree is the actual vacuum setting value that varies according to the exhaust volume of the object being pumped: the high vacuum degree is set at 50-100 Pa (which can effectively remove water);

 Low vacuum control at ≤ 2000 Pa (limited under nitrogen exchange).

Ⅲ 、Process Performance

1. Independent control operation for heating, vacuum pumping, and nitrogen addition;

2. High vacuum design: The inner cavity is made using standard welding techniques for pressure vessels, with high vacuum retention, long durability, and no deformation;

3. Stable temperature uniformity: the uniformity under constant temperature reaches ± 2 ℃;

4. Reasonable space design: The internal cavity size can be designed according to the customer's battery size to improve space utilization efficiency;

5. Accurate temperature control: The temperature control adopts thyristor SSR+PID mode, with small thermal inertia and good temperature control effect;

6. Six fold safety protection: ensuring operational safety and product reliability;

7. Heating method: Hot air is used to circulate inside and outside the chamber to maintain a consistent temperature inside and outside the furnace chamber. Then, heat radiation and conduction are used to ensure uniformity of the chamber temperature. When cooling, the heating pipe is closed and the heat inside is carried away through the air circulation, accelerating the cooling speed;

8. Automatic program control: PLC program control heating, vacuum pumping, nitrogen injection, manual/automatic operation can be switched, and timed heating can be automatically completed; Simply set the heating time, vacuum time, and nitrogen time, and the program automatically completes the baking and air exchange process.

9. Inner chamber overtemperature protection, automatically turning off the power when overtemperature occurs;

10. Electric heating tube overcurrent and short circuit protection;

11. Internal circulation fan overcurrent and short circuit protection;

12. Control system overcurrent and short circuit protection;

13. Specially designed explosion-proof doors, resistant to strong pressure; And it has the function of overpressure self release;

When the inner chamber is overcharged, the equipment can automatically close the nitrogen and dry gas inlet, saving gas and reducing gas loss;

15. Set a time independent sound and light alarm.

16. The supplier shall provide a vacuum system that allows up to three chambers to be simultaneously opened for vacuum extraction. After the vacuum degree is reached, the branch valve will be automatically closed to start vacuum extraction for other branch chambers (the vacuum system adopts a combination of oil pump and Roots pump, and can be equipped with an oil pump SV300m) ³/ h. Roots pump 1000m ³/ h）；

17. The vacuum system includes a two-stage vacuum pump and vacuum pipeline. The vacuum pump is self-contained or provided by the supplier.

18. The vacuum pipeline shall be arranged reasonably according to the confirmed drawings in the actual contract and the position between the vacuum pump and the oven. The supplier shall provide vacuum corrugated pipes for short distances; If additional vacuum pipelines need to be installed, it is necessary to confirm in advance and designate the construction party.

19. Control mode: The working mode of heating, vacuum pumping, and inflation is PLC automatic circulation, and the operation of each working section is set through the touch screen.

Ⅳ 、Main Component Structure

1. Main components of the equipment: rack, tank, vacuum injection nitrogen, electrical control, external circulation, internal circulation, and cooling system (optional);

2. The main body of the vacuum box is composed of sheet metal structure, heating system, blast circulation system, software control system, etc;

3. The auxiliary cooling system is mainly composed of cooling exchange valves, cooling pipelines, and high-pressure fans, which cool the chamber from outside the studio;

4. The auxiliary cooling system is shared by three chambers, and each free valve is independently controlled;

5. Vacuum system, composed of vacuum pipelines;

6. Shell material: A3 cold-rolled steel plate, baked paint treatment, color is computer warm gray;

7. Inner chamber material: 304 # stainless steel industrial wire drawing plate, thickness: 5.0mm;

8. Door opening method: single door opening; The door interlayer is made of aluminum silicate insulation cotton. The furnace door adopts a compression sealing method (when the door is closed, it is sealed), and the outer shell of the furnace door is made of steel plate, and the outer surface is treated with baking paint;

9. Sealing ring: Silicone rubber O-shaped sealing ring formed by mold casting, resistant to high temperature and corrosion;

10. Vacuum pumping and nitrogen filling positions and interface specifications: The interface position is at the rear of the equipment; The vacuum connection is KF40, and the dry gas connection is a  12mm gas pipe connection.

Ⅴ 、Component Brand

1. Temperature controller: digital intelligent temperature controller/microcomputer PID automatic calculation (Shanghai Yatai);

2. Vacuum gauge: Swiss Inficon resistance vacuum gauge;

3. Vacuum valve/inflation valve: Chuanbei High Vacuum Flapper Valve;

4. Overtemperature protection: Digital intelligent temperature controller/microcomputer PID automatic calculation (Shanghai Yatai);

5. Temperature control mode: PID+SSR thyristor (Shanghai Yatai);

6. Temperature sensor: K-type thermocouple;

7. PLC: Fujian Maintenance and Control;

8. Touch screen: 7-inch LCD maintenance color screen;

9. Independent alarm: audible and visual alarm;

10. Heating tube: Best.

Ⅵ 、Reference Picture