How To Detect And Distinguish The Quality Of Lithium Iron Phosphate Battery Packs?
Dec 29, 2023
1. Consistency
If a lithium battery pack with poor consistency has a protective plate, its capacity will be the lowest according to the bucket principle. As a result, the entire battery pack will neither be able to fully release electric energy nor fully absorb electric energy due to one cell. , over time, the life of the battery pack will be short. If the battery pack does not include a protective plate, it will not only suffer a loss of capacity, but may also cause safety issues such as overheating and explosion.
The method to test the consistency is: connect the cells to be tested in series, in groups of 4 or 6, and do 1C charging and 3C discharging. During the charging and discharging process, just look at the difference in the rise and fall of the cell voltage. .
2. Self-discharge rate
Due to the large power consumption of lithium iron phosphate battery packs, this requires the self-discharge rate of the battery pack to be less than 2% per month. To achieve this, the above-mentioned consistency requirements are essential. After passing the consistency test, the self-discharge rate The method for testing the rate is: charge batteries with the same capacity and let them sit for a month, then measure their capacitance value.
3. High magnification
A battery pack that can withstand high-rate charge and discharge has a strong ability to charge and discharge quickly. For lithium iron phosphate batteries, it must be able to charge and discharge quickly to meet its requirements for lithium batteries.
The test method for high rate is: test with the highest rate according to the conditions provided by the lithium battery UPS manufacturer. If there is obvious serious problem of heating during the charging and discharging process, the quality of the battery is not good. Generally speaking, power lithium battery packs should meet the safety requirements of 3C charging and 30C discharge.
4. Long life: As a general requirement, lithium iron phosphate battery packs still have 85% capacity after 2,000 discharges at 1C, and 80% capacity after 3,000 discharges. Of course, each manufacturer sets different standards due to different levels of technology and materials.
The testing method is theoretically based on the data provided by the manufacturer. Whether the data provided by the manufacturer is true or not can only be determined by the brand effect at present, which depends on which brand consumers trust.
How to identify the quality of lithium battery packs?
◆The higher the charge and discharge rate, the better.
◆The more charge and discharge cycles, the better.
◆The smaller the internal resistance, the better. This parameter changes at any time with the load, temperature and other factors. As the battery life decreases, the internal resistance gradually increases.
◆Battery consistency: The higher the consistency in capacity, internal resistance, and charge and discharge curves of batteries produced using the same materials and processes, the better.
Lithium iron phosphate battery packs are becoming more and more widely used due to their high safety, especially when used in UPS lithium batteries, which have huge room for development. With the continuous advancement of science and technology, people gradually pay more attention to environmental protection. Traditional lead-acid batteries have gradually faded out of people's sight, and lithium battery packs will become a better choice for people.
For those of you who plan to buy lithium iron phosphate batteries recently, you should pay attention to the above points. I believe it will be of great help to you on how to detect and distinguish lithium iron phosphate battery packs. When purchasing, try to choose a good quality lithium battery pack so that it can be used for a longer period of time.
