What are the performance indicators of power batteries?

The performance indexes of power battery include energy, energy density, charge-discharge rate, cycle life, safety, consistency and reliability. According to different types of power batteries, their performance indicators are also different.

The energy of energy battery refers to the electric energy that the battery can output under a certain discharge system, and the unit is Wh or kWh. It affects the driving range of electric vehicles. The energy of the battery is divided into total energy, theoretical energy, actual energy, specific energy, energy density, charging energy, discharge energy and so on.

Under the given vehicle weight and normal driving conditions, the cruising range of new energy vehicles is mainly determined by the energy of batteries. Battery energy (Wh) is equal to energy density (Wh/L) multiplied by battery volume (l), or specific energy (Wh/kg multiplied by rubber) multiplied by battery mass (kg).

Advantages of power battery

1, Long-life, Long-life lead-acid battery has a cycle life of about 300 times, with a maximum of 500 times, while the best cycle life of lithium iron phosphate power battery can reach more than 2,000 times, and the standard charge-discharge battery (5-hour rate) can reach 2,000 times. Lead-acid batteries of the same quality are "new half year, old half year and maintenance half year", and the longest time is 1~ 1.5 years, while lithium iron phosphate batteries will be used for 7-8 years under the same conditions. Comprehensive consideration, the cost performance will be more than four times that of lead-acid batteries.

2. Safe use. Lithium ferrous phosphate completely solved the potential safety hazards of lithium cobaltate and lithium manganate. Lithium cobalt oxide and lithium manganese oxide will explode in a strong collision, which poses a threat to the life safety of consumers, while lithium ferrous phosphate will not explode even in the most serious traffic accidents after strict safety tests.

3. The battery can be charged and discharged quickly with a large current of 2C. Under the special charger, the battery can be fully charged within 40 minutes at 1.5C, and the starting current can reach 2C, but the lead-acid battery does not have this performance.

4. High temperature resistance. The peak value of Ferrous lithium phosphate can reach 350℃~500℃, while lithium manganate and lithium cobaltate are only around 200℃.

5. Large capacity.

6. No memory effect.

7. Small size and light weight.