4. ECS

4 1 heat dissipation design the 20c1600k container’ environmental control system includes the air conditioner and liquid chiller unit the liquid chiller unit delivers low temperature coolant to the copper tube inside the battery pack the coolant will exchange heat with the cells inside the battery pack, and the heated coolant will return to the liquid chiller unit the radiator inside the liquid chiller unit will release heat into the air outside the container the air conditioner is responsible for maintaining the air humidity inside the container when the humidity reaches the set value, the dehumidification function will be activated the liquid chiller unit contains components such as compressor, condenser, radiator, water pump, etc each battery pack is equipped with a heat dissipation copper pipe at the bottom the heated coolant enters the liquid chiller unit through the water pump, exchanges heat on the heat exchanger for the first cooling, and then cools down in the condenser for the second time finally, the cooled coolant is transported back to each pack to exchange heat with the battery cells in the pack thermal simulation experiment, the cell surface temperature is within the allowable range, and the functional safety control design is reasonable the following conclusions can be drawn 1\ the maximum temperature of the final battery cell in steady state analysis is around 30 ℃; 2\ the maximum temperature of the battery cell is 30 57 ℃, the minimum temperature is 27 44 ℃, and the temperature difference between the monitoring points is 3 13 ℃; 4 2 environmental control system 4 2 1 liquid chiller unit product features l integrated design, saving on site installation and debugging costs l independent dual system design with high control flexibility l high energy efficiency variable frequency compressor, variable frequency design, efficient and energy saving l stepless speed regulation of compressor and intelligent regulation of cooling capacity l intelligent speed regulation of fan, constantly matching with thermal load, efficient and energy saving l select rs485 interface to achieve remote setting and monitoring functions l equipped with automatic start function for incoming calls and providing various alarm and protection functions l environmentally friendly refrigerant that meets rohs requirements l high reliability, 365 days/year uninterrupted operation l small size and compact structure liquid chiller unit parameter value unit quality & installation weight 400 kg install floor type application environment outdoor environmental protection& performance work environment 30 to +55 ℃ storage environment 40 to +70 ℃ noise grade 80 db(a) ip protection level ip x5 refrigerating fluid r410a secondary refrigerant 50% ethylene glycol cooling & heating cooling capacity\@l45/w18 40 kw heating capacity 12 5 kw outlet water temperature 18 ℃ circulating flow rate rated circulating flow rate 400\@150kpa l/min power loss rated cooling input power\@l45/w18 21 kw rated heating input power\@tu 10℃ 14 0 kw self circulation model (single pump operation) power 0 94 kw max power loss 23 9 kw power system rated working power 380 3n 50hz v, hz support voltage range 380±15%v 3n 50±3hz v, hz maximum operating current (low voltage) 58 5 a 4 2 2 dehumidification air conditioner 4 2 3 air conditioner item value external dimensions (height x width x depth) 548x315x170mm external dimensions (height x width x depth) with flange 582x352x170mm working temperature range 40 +55ºc noise level 50db(a) protection from dust, water and wind driven rain ip 55 refrigerant r134a rohs compliant yes anti salt fog grade c4 m cooling capacity\@l35/l35 600w heating capacity 500w refrigeration input power l35 l35 240w refrigeration input current l35 l35 1 15a internal circulation air volume (free air supply) 120m3/h power supply range 220 240,50 60 hz max current 2 3a weight 17kg