Rechargeable LiFePo4 Battery Pack
Scope of application
This product specification describes the performance indicators of lithium iron phosphate energy storage system produced by SHENZHEN CONSNANT TECHNOLOGY CO., Ltd. (CONSNANT). This specification product system is used for backup power supply in the household small energy storage system or UPS backup power system. The DC output voltage range is 10V-14.6V, and the capacity configuration range is 82Ah.
Features
1) Badly environment application ability. Salt fog environmental monitoring and high humidity environmental monitoring technology were applied, and the monitoring data were sent to the lithium battery management system. The system analyzed and processed the detected data, started corresponding maintenance equipment according to different conditions, and ensured the reliability and safety of the lithium battery management system.
2) Rate-type discharge stability, the voltage difference is less than 0.5V;
3) Flexible battery packs configuration technology. Battery pack equalization and cascading technology for stable performance in voltage withstand and current surge test and use. Especially high-power inductive load test, fully meet the design criteria of high reliability.
4) Advanced management architecture. In the balance of the battery pack, the client-server structure is adopted, so that each battery cell in the battery pack is under the same management, so that the battery pack can achieve good consistency.
5) Advanced intelligent maintenance capabilities. The product has maintenance-free, long operating life.
6) Highly reliable lithium battery system. The lithium iron phosphate battery system is adopted, and the production and the volumetric process are strictly controlled, and the consistency is high and the safety is good. With long cycle life, it can be charged quickly at 0.5C and discharged at 2C.
7) Green. Does not contain any heavy metals and rare metals, non-toxic, non-polluting, in line with European ROHS regulations.
Battery Capacity
| No. | Item | Specification |
| 1 | Rated capacity | 82Ah, 0.2C discharge |
| 2 | Minimum capacity | 82Ah,0.2C discharge |
| 3 | Nominal voltage | 12.8V (4s) |
| 4 | Internal resistance | ≤50 mΩ |
| 5 | Charge voltage | 14.6V |
| 6 | Charge current |
Standard charge:0.2C Fast charge:0.5C |
| 7 | Standard charge | 22.5±2.5℃0.2C CC constant current(CC)charge up to 14.6V,then constant voltage 14.6V(CV)charging up to the charge current ≤0.01C |
| 8 | Charge time |
Standard charge:5.5~6h(Reference) Fast charge:1.5~2.5h(Reference) |
| 9 | Maximum charge current | 35A(0℃~+45℃) |
| 10 | Maximum sustained discharge current | 50A(-20℃~+60℃) |
| 11 | Maximum pulse current | 150A(3S) |
| 12 | Discharge cutoff voltage | 10.0V |
| 13 | Cycle life(the cycle quantity is not less than 4000) |
Test conditions: Charge: 0.2C to 14.6V Discharge:0.2C to 10.0V Stop testing when the discharge capacity will reach 80% of the initial capacity. |
| 14 | Working temperature |
Charge:0°C ~ 45°C Discharge:-20°C ~ 60°C |
| 15 | Storage temperature | -10°C ~ 45°C |
| 16 | Storage humidity | ＜80﹪RH |
| 17 | Weight | Approx:13.5 Kg |
| 18 | Dimension | 280(W)*260(D)*180(H) (Metal case) |
System technology topology and electrical parameters:
The whole system consists of 104 pieces 3.2V 3200ma 26650 cylindrical lithium iron phosphate battery cells with 4 series and 24 strings. A battery protection system is used to manage temperature, voltage, current and capacity consistency.
The outer module of the battery module is 280 (long) *260 (wide) *160 (high) iron box.
The continuous operating current is 50A.
Electrical performance
| No. | Item | Standard | Test methods |
| 1 | Room temperature discharge performance |
Discharge capacity / Nominal capacity×100％ A)0.2C5A ≥100％ B)0.5C5A ≥95％ C)1C5A ≥90％ Charging and discharging curves should be smooth and smooth. |
Under the condition of 1 standard atmospheric pressure, ambient temperature 25 (+5 C) and relative humidity 45%-80%, after standard charging of single energy-saving cores (if not specified below, they are all placed under this condition, according to this charging mode), they are put on hold for 10 minutes, with 0.2C5A, 0.5C5A, 1C5A, discharge to the lower limit voltage 10V respectively, and cycling three times. Once the standards are met, the standard requirements will be met. |
| 2 | Normal temperature charge retention |
Remaining capacity≥nominal capacity*92％ Recovery capacity≥nominal capacity*95％ Open circuit voltage reduction rate≤3％ Internal resistance increase rate ≤10％ |
Measure the initial state and initial capacity of the single cell. After standard charging, open circuit is placed for 30 days to measure the final state of the single cell. Measure the remaining capacity of the cell by discharging 0.2C5 to 10V. Measure the recovery capacity of the cell by 0.2C/0.2C, which can be recycled three times. Once it reaches the standard, it will meet the standard requirements. |
| 3 | Use life | Not less than 2500 times | 100%DOD discharge,0.2C5 nominal cycle continuous use up to the remaining capacity below 80% of nominal capacity. |
| 5 | Storage performance |
0.2C5A discharge time A battery that stores for 3 months.≥2.7h； A battery that stores for 6 months.≥1.5h； A battery that stores for 12 months.≥1.2h |
The initial capacity of the battery was measured. After charging to 14.6 ±1V, the initial state of the battery before storage was measured. After storage at room temperature for 3 months, 6 months and 12 months, the final state of the battery was measured. Then the discharge time of the battery was recorded three times by 0.5C5 / 0.2C5 cycle. |
| 6 | Capacity recovery performance | The battery has been stored for more than 6 months without maintenance; the 0.1C has charge and discharge for 5 cycles, the recovery capacity is more than 98%. |
The battery is charged to 14.6V at a constant current of 0.1C, then charged to 0.01C at a constant voltage of 14.6V, and discharged to 0.01C at a constant voltage of 10V. It is repeated after 30 minutes. After repeated cycle 5, the recovery capacity is greater than 98% of the original capacity.
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Safety performance
| No | Item | Standard | Test method |
| 1 | Over charge performance | No explosion, no fire. Maximum surface temperature≤130℃ | After standard charging, the initial state of the battery is measured to ensure the normal state of the battery (the same below). The battery is charged to 14.6V with 1C5A current, and then the constant voltage charging is changed to terminate at the current of 0.01C5A. The temperature and appearance of the battery are observed. |
| 2 | Over discharge performance | No explosion, no fire | After standard charging, the initial state of the battery was measured, discharged to 10V with 1C5A, and then connected the positive and negative electrodes of any single cell with 10Omega resistance for 14 days. Observe the appearance of battery. |
| 3 | Normal temperature short circuit performance | No explosion, no fire. Maximum surface temperature≤130℃ | After standard charging, the initial state of the battery is measured, and the positive and negative electrodes are directly short-circuited in the explosion-proof glass cover (the total resistance of the line is not more than 50 mΩ). The test ends when the temperature of the battery drops to about 10 C below the peak value. Observe the temperature and appearance of the battery. |
| 4 | Thermal shock safety performance | No explosion, no fire | The initial state of the battery is measured. After standard charging, the battery is placed in the hot box and connected with the thermocouple. The temperature rises to 150 ±2 ℃ at a rate of (5 ±2 ℃)/min and is kept for 10 minutes. Observe the appearance of battery. |
Environmental adaptability
| No | Item | Standard | Measure method |
| 1 | Thermal cycling performance | No leakage, no smoke, no fire. Non explosion | After standard charging of a single battery, the battery was placed open for 48 hours at ambient temperature of 75±2℃, 6 hours at - 20 C, and 24 hours at room temperature. Observe the appearance of battery. |
| 2 | Constant damp heat performance |
Discharge capacity after storage / nominal capacity×100％≥60% The appearance of the battery has no obvious deformation, no corrosion, no smoke, and no explosion. |
After standard charging of a single battery, it is placed in a constant temperature and humidity box with a temperature of 40℃±5℃ and a relative humidity of 95%. After 168 hours, the battery is taken out and placed for 2 hours. Observe the appearance of battery. Then 0. 5C5A discharge to 10V is used to measure the final capacity of the battery. |
| 3 | Drop performance | No fire, and no explosion | The initial capacity of the battery was tested. After standard charging, the initial state of the battery was measured. The sample of the battery was freely dropped to the cement floor from a height of 1 m (the lowest height), requiring two drops. |
| 4 | Discharge performance at different temperatures |
Discharge capacity / nominal capacity×100％ A)60℃ ≥95%； B)0℃ ≥85％； C)-10℃ ≥70%； D)-20℃ ≥60%. The appearance of the battery has no obvious deformation, no leakage, no smoke, no explosion and no fire. |
The initial capacity and initial state of the battery were measured. After standard charging, the battery was put on hold for 3 hours at 60±2℃, discharged at 0. 5C5A to 10V, and then charged at room temperature. According to this, the battery was shelved for 20 hours at the corresponding constant temperature according to the order of 0±2 ℃/-10±2 ℃/-20±2 ℃. The terminal capacity of the battery was measured by 0. 2C5A. Finally, the battery was shelved for 2 hours at room temperature. The final state of the battery was measured to observe the appearance |
| 5 | Vibration environment adaptability |
Remaining capacity≥nominal capacity×95％ Voltage attenuation≤0.5％ Battery internal resistance increase rate ≤20％ The battery has no apparent damage, no leakage, no smoke and no explosion. |
After standard charging, the initial state of the battery is measured and installed on the shaking table. The test equipment is adjusted according to the vibration frequency and corresponding amplitude below. Cyclic sweeping vibration of 10 Hz to 55 Hz in each direction of X, Y and Z is 30 minutes, and the sweeping speed is 1 oct/min. A) Vibration frequency:10Hz～30Hz Displacement amplitude(single amplitude):0.38mm B) Vibration frequency:30Hz～55Hz Displacement amplitude(single amplitude):0.19mm After the frequency sweep is over, test the final state of the battery and observe the change in appearance of the battery. |
The charger of Rechargeable LiFePo4 Battery Pack
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