Ternary lithium.
48V12Ah lithium battery, ternary lithium batteries generally use 13 or 14 strings, and lithium iron phosphate batteries generally use 15 or 16 strings. Ternary lithium battery cell, single voltage range is 4.2V to 2.75V, voltage range after 13 strings is 54.6V to 35.75V, and voltage range after 14 strings is 58.8V to 38.5V.
Why do 13 strings of 48V lithium battery lose power so quickly?
First of all, your battery is a lithium battery. The single cell lithium battery is rated at 3.7V and. the actual full charge is 4.2V. When the rated lithium battery is 48V, then your battery is 48/3.7 = 12.97297297 strings, that is, 13 cells connected in series are 48V, but each battery is fully charged at 4.2V, so there are 13 strings * 4.2V = 54.6V, so if vou want your battery to be fully charged, your charger voltage cannot be lower than 54.6V. If it is lower, the battery will not be fully charged and it cannot be higher. than 54.6V. If it is higher, it is easy to overcharge, so 13 strings of 48V lithium batteries. The charger voltage used is set to 54.6V.
1. Battery Quality Questions
For lithium batteries that do not meet quality standards, manufacturers reduce costs during production. The lithium battery cannot withstand after use, the battery capacity will decrease quickly after a while.
In addition, the quality of the battery in the lithium-ion battery is not good and the quality is insufficient, which will also cause the problem of rapid decline of lithium battery power.
2. Used batteries
The purchased lithium battery is a second-hand battery, such as a replaced battery from an electric car. Then used in battery vehicles, this type of battery will also age quickly. The external manifestation is that after charging, there will be a problem of rapid power loss.
3. Problems with individual battery packs
In the lithium battery pack, if individual battery packs Individuals are discarded, they cause the battery to drain electricity, which is responsible for the chronic discharge of batteries.
Inspection method: After full charging, disconnect the series connection point and measure the voltage changes of each group after one to two days if the voltage of a certain group drops to. less than 4V, then check Among them, defective batteries should be disposed of.
4. The protection panel has a fmore
Some lithium batteries do not store electricity. Unplug the protection panel and. red When measuring at 10k level with the black test pen, it was found that the protection plate had a leak. After discarding the protection plate, simply charge the battery directly with 4.1V.
Solution: For the protection plate leaking problem, you can install a toggle switch to disconnect the parallel line between the battery anode and the protection plate, open it when using. electricity, and charge and close when using electricity.
5. Power consumption of the alarm
If there is no problem with the lithium battery, you need to check if there is a problem with the alarm on the car. Sometimes the alarm is *** It consumes power 24 hours a day, so naturally there will be questions about a perte of fast power.
6. The tram itself is defective
After excluding the above reasons, you can check the tram brake pads, tires and check the wheel axle to see if the battery is not working properly due to machine failure.
Summary:
Firstly, check if there is a faulty battery, and secondly, use a 10k or 1k multimeter to measure the protection panel. 3. Check if the alarm has internal power consumption. When in doubt, remember to turn off the main power when the car is not needed.