1,General
This product specification describes the technique standards,test methods and precaution notes of prismatic type( Lithium ion) LiFePO4 rechargeable cell,manufactured by Shenzhen Topband Battery Co.,Ltd.
2,Dimension
3,Product specification(RT:25±2℃)
| No. | item | standard | remark |
| 3.1 | Nominal capacity | 20.0Ah | RT,1C |
| 3.2 | Min capacity | 19.5Ah |
| 3.3 | Internal impedance | ≤2mΩ | RT,1000Hz |
| 3.4 | Nominal voltage | 3.2V | |
| 3.5 | Weight | 610±20g | |
| 3.6 | Voltage range | 3.65～2.00V | |
| 3.7 | Recommended charge current | ≤1C | |
| 3.8 | Recommended discharge current | ≤1C | |
| 3.9 | Max continuous charge current | 5C | RT,11min |
| 3.10 | Max continuous discharge current | 10C | RT,6min |
| 3.11 | Max pulse charge current | 5C | RT,10s |
| 3.12 | Max pulse discharge current | 15C | RT,10s,SOC≥20% |
| 3.13 | Cycle life | 2000 cycles capacity retention≥80% | RT,1C,100%DOD |
| 3.14 | Charging temperature | 0～45℃ | |
| 3.15 | Discharging temperature | -20～55℃ | |
| 3.16 | Storage temperature | -10～30℃ | |
| 3.17 | Appearance | No break,scratch,distortion,contamination,leakage. |
4,Test Conditions
4.1 Standard Test Conditions
4.1.1 All tests defined in this Product Specification are conducted at temperature 25±2 ℃,humidity 15%～90%RH,atmospheric pressure 86～106kPa.
4.1.2 Unless there are other special instructions,all performance was tested with unused cells within 1month after production date.
4.2 Standard Charge Method
The "Standard Charge" means in an ambient temperature of 25±2 ℃,the cell was discharged with 1C constant current to cut-off voltage 2.0V,standing 1hour.Then charged it with 1C constant current to 3.65V,then change into constant charge mode,until the charging current down to 0.05C,then stop charging and standing 1h.
5,Electrical Characteristics
| No. | Item | Test method | Criteria |
| 5.1 | High Temperature Discharge Performance | The cell was charged in accordance with 4.2,and stored in an ambient temperature of 55±2℃ for 5h,then discharged to 2.0V with 1C constant current.After that,then place the cell in the ambient temperature of 25±2 ℃ for 4h then check its appearance. | 1 , Retention capacity at 55℃ ≥95% 2, No deformation, No crack. |
| 5.2 | Low Temperature Discharge Performance | The cell was charged in accordance with 4.2,and stored in an ambient temperature of -20±2℃ for 24h,then discharged to 1.8V with 1C constant current.After that, place it in the ambient temperature of 25±2 ℃ for 4h, then check its appearance. | 1 , Retention capacity at -20℃ ≥80% 2, No deformation, No crack. |
| 5.3 | Rate Charge Performance in Normal Temperature | Under the ambient temperature of 25±2 ℃ a.Discharged to 2.0V with 1C constant current,stay for 1h. b. Charged to 3.65V with 5C constant current,stay for 1h. c. Discharged to 2.0V with 1C constant current. | Capacity retention≥80% |
| 5.4 | Rate Discharge Performance in Normal Temperature | The cell was charged in accordance with 4.2,then discharge to 2.0V with 10C current in an ambient temperature of 25±2 ℃. | Capacity retention≥95% |
| 5.5 | Charge Retention | The cell was charged in accordance with 4.2,and stored in an ambient temperature of 25±2 ℃ for 28 days,and then discharged to 2.0V with 1C constant current. | Capacity retention ≥80% |
| 5.6 | Cycle Life (25±2 ℃) | The cell was charged to 3.65V with 1C CC/CV cut off 0.05C,stayed for 30min;Subsequently,the cell was discharged to 2.0V with constant current 1C,and stayed for 30min;Prior to next charge-discharge cycle.Record all the cycles until the retention capacity＜80%. | ≥3000cycles |
6,The performance test curve(for reference)
The capacity retention at different discharge rate
The capacity retention at different charge rate
The dischcarge capacity retention at different temperature
The capacity retention at different cycles
7,Environmental Characteristics
| No. | Item | Test Method | Criteria |
| 7.1 | Temperature cycle | The cell was charged in accordance with 4.2,and then repeat the following procedures for 5 cycles,then check the cell's appearance. 
 | No leakage,no fire,no explosion, no vent |
| 7.2 | Low-pressur e Test | The cell was charged in accordance with 4.2,then stored for 6h at a vacuum of -90KPa,after that put the cell in room temperature for 6h,then check the cell's appearance. | No leakage,no fire,no explosion, no vent |
| 7.3 | Vibration Test | The cell was charged in accordance with 4.2,and then installed onto the vibration machine.Equipment parameters of frequency and amplitude are set as bellow (the frequency is to be varied at the rate of 1oct/min between 10 and 55 Hz,and repeat vibration for 30 min.The cell is tested in three mutually perpendicular directions,i.e.X,Y,Z): - frequency:10Hz~30Hz,amplitude: 0.38mm;
- frequency:30Hz~55Hz amplitude: 0.19mm;
| 1. No scratch,no fire,no explosion, no vent; - The voltage is not less than 3.2V.
|
| 7.4 | Mechanical shock | The cell was tested in accordance with 4.2,and then secured to the testing machine by means of rigid mount which supports all mounting surfaces of the cell.Each cell shall be subjected to a total of three shocks of equal magnitude.The shocks are to be applied in each of three mutually perpendicular directions.The acceleration and impulse time are as follows: acceleration of impulse peak value: 100m/s2,shock frequency:40~80 times/min,impulse lasting time:16 min,shock times:1000±10 . | - No scratch, no leakage, no fire, no explosion, no vent;
2. the voltage is not less than 3.2V. |
8,Safety test
All below tests are carried out on the equipment with forced ventilation and explosion-proof device.Before test, all cells are charged in accordance with 4.2, and stored 24h prior to test.
| No. | Item | Test Method | Criteria |
| 8.1 | Short- circuit Test | The cell was charged accordance with 4.2, after that the cell is short-circuited by connecting the positive and negative terminals with a wire for 10min, the wire has a maximum resistance load of 5mΩ,then observe for 1h. | No fire, no explosion |
| 8.2 | Overcharge Test | The cell was tested in accordance with 4.2, then 1C constant current charged till the voltage reaches 1.5 times of the specified end-off charge voltage, or the charge time reaches 1h, then stop charge, and observe for 1h. | No fire, no explosion |
| 8.3 | Over discharge Test | The cell was tested in accordance with 4.2, then 1C discharge for 90min, then observe for 1h. | No fire, no explosion, no leakage |
| 8.4 | Crush Test | The cell was tested in accordance with 4.2, and then is placed on the crush machine, the axis is parallel to the crush equiment, and it is crushed between two flat surfaces till the crushing force is gradually approaching 200 kN, or voltage reaches 0V,or reaches 30% distortion, then observe for 1h. | No fire, no explosion |
| 8.5 | Impact Test | The cell was tested in accordance with 4.2, and then placed on the impact flat.A Φ15.8mm bar is to be placed on the center of the cell.A 9.1kg weight is dropped from a height of 610mm onto the cell, the distortion is allowed. | No fire, no explosion |
| 8.6 | Nail Test | a) The cell was tested in accordance with 4.2 b) use φ5mm～φ8mm high temperature resistance steel needle, with speed of 25±5 mm/s, to go through the cell from vertical direction of pole plate, the penetrate position should be close to the geometric center of plate surface, the steel needle remains in the cell; | No fire, no explosion |
| 8.7 | Heating Test(130℃) | The cell was tested in accordance with 4.2, and then heated in a circulating air oven.The temperature of the oven is raised at a rate of 5℃ per minute to 130±2℃ and remain for 30 min. | No fire, no explosion |
9,Shipment
The Cell shall be shipped by insulated packaging and in voltage range of 3.300±0.030V, and 50% SOC, or in accordance with customers’ requirement.The remaining capacity before charging shall depends on the storage time and conditions.To ensure the cells in a good transport environment is necessary.
10,Warranty
10.1 In this specification, quality assurance protocol is the main quality assurance protocol if it conflicts with the quality assurance protocol.
10.2 If customers due to abuse or misuse, Shenzhen Topband Battery Co.,Ltd will not be
free replacement.
10.3 Shenzhen Topband Battery Co.,Ltd will not undertake any responsibility for breach of safety operation problems.
10.4 Shenzhen Topband Battery Co.,Ltd shall be exempt from warranty for fault cells come from by matching electric circuit connection, other battery packs and charger.
10.5 It's out of guarantee servie by Shenzhen Topband Battery Co.,Ltd after customer assemble the cell(if the cell is bad in the proces of assembly).
- This specification was developed after consultation between the parties.For projects not included in this specification, Shenzhen Topband Battery Co., Ltd.does not undertake quality assurance.
11,Precautions and Safety Instructions
Abusive use of (lithium-ion) LiFePO4 rechargeable batteries would cause damage to the cell and/or personal injury.Please read the precautions and safety instructions below before using.
11.1 Standard cell precautions
a.Do not expose the cell to extreme heat or flame.
b.Do not short circuit, over-charge or over-discharge the cell. c.Do not subject the cell to strong mechanical shocks.
d.Do not immerse the cell in water, or get it wet. e.Do not disassemble or modify the cell.
f.Do not handle or store with metal objects like necklaces, coins or hairpins, etc. g.Do not use the cell with conspicuous damage or deformation.
h.Do not connect cell to the plug socket. i.Do not touch a leaked cell directly.
j.Do not mix the new and old Lithium-ion cell and use together.
k.Do not expose the cell to blazing sun (or in heated car by sunshine). l.Keep cell away from children and pet.
m.Do not nail into the cell, strike it by hammer or tread it. n.Do not impact or throw the cell.
o.Do not direct contact the cell positive and negative electrode with aluminum case.
11.2 Cell Operation Instructions
11.2.1 charging
a.Charge the cell in a temperature range of 0°C to 45°C .
b.Charge the cell at a constant current of 1C until 3.65V, and then at a constant voltage of 3.65V until current is 0.05C.Over 2C Charge rate is not allowed.(C : Rated Capacity of cell)
c.Use a matched or recommend (CC/CV) lithium-ion (Li+) battery charger.
11.2.2 Discharging
a.Recommended cut-off voltage is 2.0V.Recommended max continuous discharge current is 3C. b.For maximum performance, the cell should be discharged in a temperature range of 0°C to 35°C.
11.2.3 Storage Recommendations
a. To protect the cell, good storage environment is necessary.
b. In case of long period storage (more than 3 months), storage the cell at temperature range of
–10~+30°C , low humidity, no corrosive gas atmosphere. c.Do not press the cell.
d.Charge and discharge the every 3months is recommended, charge and discharge the cell every 6months is obligatory.
e.Charge and discharge steps as bellow:
In temperature of 25±2 ℃, 1C discharge to 2.0V, stay for 30min,1C CC/CV charge to 3.65V cutoff 0.05C, stay for 30min,1C discharge to2.0V, stay for 30min ,1Ccharge for 0.5h.
Note 1.The customer is required to contact Shenzhen Topband Battery Co.,Ltd in advance, if and when the customer needs other applications or operating conditions beyond those described in this document.
Note 2.Shenzhen Topband Battery Co.,Ltd shall take no responsibility for any accident when the cell is used under other conditions than those described in this specification.
12.Requirement for safety assurance
For safety assurance, please discuss with Shenzhen Topband Battery Co.,Ltd in advance for your equipment design, the circuit protection of battery/cells, high rate discharge, rapid charge and other aspects of special application.
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