Item	Specification	Remarks
Cell Model:	ZTICP06160230P29F
Rated voltage:	48.1V
Rated capacity	28Ah	0.2C charge, 0.5C discharge
-20℃ capacity	19.6Ah
End-off voltage	35.75V
charging cut-off voltage	54.2V
Inner resistance	≤50mΩ (with BMS)	Cell pack resistance ≤40mΩ
Standard charge	0.2C constant current charge to 54.2V, then constant voltage Charge 54.4V until charging current ≤0.05C Maximum continuous charging current: 0.5C	Charging time: approximate 6hours
Standard discharge	Rated discharge current: 0.5C Maximum continuous discharge current: 0.7C
Operation temperature	charge: 0~50℃	60±25%R.H.
Operation temperature	Discharge: -20~55℃
Storage temperature	0~25℃(10~12 months) -5~35℃(2~3 months)	>50% SOC
IP Class	IP65
Weight	10Kg
Dimension	325mm H * 110mm W * 180mm L

Electrical performance test

Item	Test method	Technical standard
Charge retention ability and charge recovery ability	1) Standard discharge, record the battery capacity; 2) Standard charging; 3) Open circuit,placed in 20℃±5℃ environment for 28 days; 4) Standard discharge, record the battery capacity, calculate the charge retention capacity; 5) Standard charging; 6) Standard discharge, record the battery capacity, calculate the charge recovery ability.	The charge holding capacity is not less than 80% of the initial capacity, and the charge recovery capacity is not less than 90% of the initial capacity.
Charge recovery ability after long-term storage	1) Standard charging; 2) After standing for 0.5h ~ 1h, discharge at 0.5C for 1h; 3) Storage at 20 ° C ±5 ° C for 90 days; 4) After the storage period, standard charging; 5) Set aside for 1h, discharge to the end voltage at 0.5C and record the discharge capacity.	The discharge capacity is not less than 85% of the initial capacity.
Low temperature discharge	1) Standard charging; 2) After the battery is placed in a temperature of -20 ° C ±2 ° C for 16h, at this ambient temperature, discharge to end voltage at 1C with constant current, record discharge capacity.	The capacity at -20℃ is not less than 70% of the initial capacity
High temperature discharge	1) Standard charging; 2) After the battery is placed in a temperature of 55 ° C ±2 ° C for 5h, it is charged at 1C at this ambient temperature Current constant discharge to end voltage, record discharge capacity.	The capacity at 55℃ is not less than 90% of the initial capacity

Safety/Reliability test

Item	Test method	Technical standard
External short circuit	1) Standard charging 2) Set aside 0.5h to 1h after charging, note that the following tests should be carried out within 24h after charging; 3) Short circuit the positive and negative electrodes of the battery pack with an external line with a resistance of 80mΩ±20mΩ until the battery Group voltage is less than 0.2V	No fire, no explosion
Short circuit protection	) Standard charging; 2) Short circuit the positive and negative terminals of the charging end and discharge end respectively with 200mΩ±20mΩ external line 0.5h, eye check the appearance of the battery pack; 3) Disconnect the outer line, measure and record the voltage at the charging and discharging end of the battery pack after the protection device resumes work.	no leakage, no fire, no explosion; After instantaneous charging, the battery pack voltage is not less than the rated voltage.
Overcharge protection	1) Standard charging; 2) Charge at 1.5 times rated voltage (72V) and 1C current for 24h.	no leakage, no fire, no explosion; The battery pack works normally
Overcharge	1) Standard charging; 2) Set aside 24h after charging; 3) Charge at 0.5C constant current, limited voltage 13 series ×5V for 90min, set aside for 6h.	No fire, no explosion
Over discharge protection	1) Standard charging; 2) Constant discharge at 0.5C to the termination voltage, and then continue to constant discharge at 0.1C for 24h.	Noleakage, no fire, no explosion , working normally
Forced discharge	1) Standard charging; 2) Set aside 24h after charging; 3) A single battery in an empty state is connected in series with the remaining single batteries in a full state, and then the battery is connected The group was charged at 1C for 60min.	No fire, no explosion
Crush	1) Standard charging; 2) Set aside 24h after charging; 3) Place the battery pack in the middle of the plate and the shaped plate, and the indenter of the shaped plate is perpendicular to the battery pack In the direction of monomer arrangement, the radius of the semi-cylindrical extrusion head of the shaped plate is 75mm, and the semi-cylinder body is formed The length is greater than the size of the extruded battery, but does not exceed 1m; 4) The extrusion speed is (5±1) mm/s, when extruded to 70% of the original size of the battery pack, or squeezed When the pressure reaches 30kN, keep it for 5min, then remove the extrusion pressure and observe its appearance for 1h. each The battery pack is squeezed only once.	No fire, no explosion
Mechanical shock	1) Standard charging; 2) Set aside 24h after charging; 3) Using a rigid fixing method (the method can fix all the surfaces of a single cell or battery pack) Fix the battery pack on the test device and bear it in each of the three perpendicular directions of the battery pack At least one direction should be perpendicular to the horizontal plane for three equivalent shocks; 4) Within the first 3ms of each impact, the minimum average acceleration is 75g, and the peak acceleration is between 125g and 175g.	No leakage, no fire, no explosion
Vibration	1) Standard charging; 2) Set aside 24h after charging; 3) The battery pack is installed on the table of the vibration testing machine and tested according to the steps specified in the national/international standard; 4) The amplitude of the battery pack vibration test is 0.76mm, the maximum stroke is 1.52mm, and the vibration frequency is between 10Hz and 55Hz, and changes at a rate of 1Hz/min; 5) Vibration tests are carried out respectively in the X, Y, and Z directions of the battery pack, The test time of the sweep cycle between 10Hz and 55Hz in each direction is 90min±5min. 6) Set aside 1h after the test, standard discharge , record the discharge capacity.	No fire, no explosion
Drop test	1) Standard charging; 2) Set aside 24h after charging; 3) Place the battery at a height of not less than 1000mm, with X,Y, and drop it to the cement surface once in each direction of X,Y, and Z.	No fire, no explosion
Low atmospheric pressure test	1) Standard charging; 2) Set aside 24h after charging; 3) Place the battery pack in the empty chamber and gradually reduce its internal air pressure to no more than 11.6kPa (Simulated 15420m height) and hold for 6h.	no leakage, no fire, no explosion
Low and high temperature impact	1) Standard charging; 2) Set aside 24h after charging; 3) Place the battery in an environment of 72 ° C ±2 ° C for 4h; 4) Within 30 minutes, the temperature is lowered to 20℃±2℃ and the temperature is maintained for 2h; 5) Within 30min, the temperature is lowered to -20℃±2℃ and the temperature is constant for 4h; 6) Within 30 minutes, the temperature is raised to 20℃±2℃ and the temperature is constant for 2h; 7) Repeat steps 3) to 6) 4 times, and place the battery pack after 5 high and low temperature shock cycles At 20 ° C ±5 ° C for 7 days.
Immersion test	1) Standard charging; 2) Set aside 24h after charging; 3) Immerse the battery pack in a tank at 20 ° C ±5 ° C (the top end of the battery pack is submerged by water) for 24h, and then take out the battery pack and place it in an environment with a temperature of 20 ° C ±5 ° C, relative humidity of no more than 85%, and atmospheric pressure between 86kPa and 106kPa for 4h.	No leakage, no rupture, no fire, no explosion
Discharge over current protection	1) Standard charging; 2) Discharge at 1.5 times of the maximum discharge current for 1h.	no leakage, no fire, no explosion, working normally
Electrostatic discharge	The battery pack is tested according to GB/T 17626.2-2006 electronic discharge requirements. The battery pack is tested for contact discharge at 4kV and air discharge at 8kV. After the electrostatic discharge is complete, check whether the protection device works properly.	working normally

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