1. | Scope of application | GB31241-2022 Safety requirements for lithium-ion batteries and batteries for portable electronic products. |
1. | Performance Parameters | Workshop size | W500mm*D500mm*H600mm |
2. | Temperature range | -70℃～+150℃ | |
3. | Temperature fluctuation | ≤±0.5℃ (no load, constant state) | |
4. | Temperature uniformity | ≤2℃ (no load, constant state) | |
5. | Temperature deviation | ≤±2℃ (no load, constant state) | |
6. | Heating rate | 5℃/min (-40℃ to 85℃, average nonlinearity throughout the process, no load) | |
7. | Cooling rate | 5℃/min (from 85℃ to -40℃, average nonlinearity throughout the process, no load) | |
8. | Equipment structure | Shell material | 1.2mm cold-rolled steel plate with double-sided spraying |
9. | Inner box material | 1.2mm SUS 304 stainless steel | |
10. | Insulation layer | 100mm polyurethane foam + ultra-fine glass wool ensures that the outer surface of the test box is free of frost and condensation; | |
11. | Equipment door | A set of manual single-opening doors is set on the front of each layer of the box, and the doors use high-strength hinges and door locks. | |
12. | Sealing strip | A double-layer silicone rubber sealing strip is used between the door and the box, which is resistant to high and low temperatures, anti-aging, and has good sealing performance | |
13. | Defrosting device | In order to prevent condensation or frost on the edges of the door frame and door during low-temperature testing, electric defrosting devices are set on the edges of the door frame and door. | |
14. | Observation window | A set of three-layer (or double-layer) hollow electric vacuum glass observation window is installed on the door. The observation window automatically turns on the defog function according to the temperature of the studio to ensure clear observation under any working conditions. | |
15. | Lighting lamp | The observation window has a set of moisture-proof lighting fixtures built in to ensure that the test pieces in the box can be clearly observed under any working conditions. | |
16. | Test hole | There are 2 Φ100mm test holes, one on each side of the left and right sides of each layer of the box. The test holes are equipped with stainless steel hole covers and flexible silicone rubber hole plugs. | |
17. | Sample rack | The equipment provides 2 layers of stainless steel perforated mesh sample racks with adjustable spacing and a single-layer load-bearing capacity of ≥100Kg | |
18. | Heating system and air duct | Heater | High-quality stainless steel armored high-speed heating tubes are used, and the heating tubes are driven by contactless zero-crossing triggering through a solid-state controller. This can prevent the electrode from falling on the heating tube and causing a short circuit after the sample fails.
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19. | Air supply form | The circulating air duct is set on the left side of the studio, using forced air circulation with upper air outlet and lower air return. The motor, impeller and heater are installed in sequence inside the air duct. | |
20. | Control System | Thermostat | The digital display touch screen can be used for temperature timing programming and temperature cycle settings. PID microcomputer SSR temperature controller, temperature control accuracy ≤0.1℃ (display range). Temperature resolution ≤0.1℃, minimum sampling time ≤1s.
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21. | Temperature sensor | Adopt PT100 platinum resistance temperature measuring body. | |
22. | Control method | Thermal balance temperature adjustment method. All electrical components are first-line brands at home and abroad, using French Schneider, German Siemens, Danish DANFOSS, Japanese Fuji, Omron and other brand series products. | |
23. | Temperature control | Adopt solid-state relay SSR control and PID adjustment. The heating system compares the real-time temperature in the box with the set target temperature. The deviation signal obtained is calculated by PID and the stepless adjustment signal is output to automatically control the output power of the heater, so that the heating amount in the test room reaches a dynamic balance with the heat loss and heat absorption, and finally achieves the purpose of constant temperature. | |
24. | Automatic calculation | It has the function of automatic calculation, which can immediately correct the temperature change conditions, making the temperature control more accurate and stable. | |
25. | Cooling System | Compressor | The studio uses a Japanese Hitachi or American Copeland compressor for cooling
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26. | Refrigeration method | Single machine refrigeration | |
27. | Refrigeration control | Controller + expansion valve + solenoid valve on and off, PID regulation controls the refrigerant flow for cold balance control. Cold balance can reduce the consumption of the compressor and heating system, and theoretically can save 35% or more energy in the low temperature stage. The heating and cooling systems are completely independent. | |
28. | Condensation method | Forced air cooling | |
29. | Refrigerant | High temperature grade: R404a, DuPont, USA | |
30. | Evaporator | It adopts slope type all-copper fin evaporator, and the surface is modified with anti-corrosion coating. The evaporator has the characteristics of compact structure, small volume, high quality and good economic benefits.
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31. | Oil separator | The oil separator separates the lubricating oil from the high-pressure steam discharged from the refrigeration compressor to ensure the safe and efficient operation of the device. Use the American Emerson oil separator (A-WC/A-FC series, determined according to the compressor) with the following features: A-WC series is welded, A-FC series is flanged. Built-in oil filter. The outer coating is anti-corrosion epoxy powder paint. Oil separation rate 99%. Maximum working pressure: A-WC: 41 bar A-FC: 31 bar | |
32. | Security | Explosion-proof chain | Install 2 explosion-proof chains on each side of the gate (4 in total) to prevent the gate from bouncing open. |
33. | Pressure relief port | There is a 300×300mm straight-through explosion-proof pressure relief port on the side of the box, and a pressure relief door is installed outside. When the pressure in the box is too high or the battery explodes, the pressure relief door will automatically open to relieve the destructive pressure in the box and reduce the impact of pressure on the door. The pressure relief door is connected to the box with high-strength hinges and stainless steel explosion-proof chains.
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34. | Safety protection | Grounding protection (grounding resistance requirement <4Ω), overcurrent protection, short circuit protection, overtemperature protection, undervoltage protection, reverse phase protection, refrigeration system overpressure protection, overload protection, motor overheat protection, controller power failure memory protection (power failure protection) and other functions. When the above faults occur, the test box stops, the control system automatically cuts off the test power supply, and sends out an audible and visual alarm. | |
35. | Three-color warning light | A cylindrical three-color sound and light alarm (with LED lamp beads) is installed on the top of the equipment. When waiting to start or running to completion, the yellow light is on. During normal operation, the green light is on. In case of emergency stop or equipment failure alarm, the red light is on and the buzzer sounds intermittently. The color arrangement and appearance of the warning lights are as shown in the figure below:
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