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Oct 19, 2021

Causes and solutions of over-discharge of LiFePO4 battery pack

The charging process is a process of filling the bucket with water, and this process is a length of time. The larger the faucet is filled with water, the faster it will be. Similarly to the battery charging depends on the charging current, the greater the current charging time is shorter!


Discharge.


Discharge: The discharge process is actually the reverse of the above, the water is released a process, of course, here depends on the power of your power supply load side, the greater the power consumption, the discharge moment will be relatively much shorter!


Here you have to give the detailed value before you can account for it.


For example, a group of LFP --- 48V100AH communication base station with power pack.


Charging current is 20A, that is, the time to charge the overflow is 5 hours; using the capacity of the battery pack divided by the current to derive the charging time.


Discharge assumption: the power at the load side is 500W


That is: 500W (load-side power) / 48V (extra voltage) = 10.42A (current)


100AH (battery capacity) / 10.42A (current) = 9.6 hours (operating hours)


Iron phosphate <a target=_blank href='dghoppt.com'> lithium battery</a> group over-discharge causes and treatment


Overcharge and overdischarge are over the original electrical capacity of the operation behavior. Overcharge and overdischarge of lithium iron phosphate batteries are damaging, causing damage to the battery, and is irreversible. Overcharge will lead to lithium dendrites, overcharge will lead to copper dendrites, will cause lithium batteries short circuit, problems; lithium batteries also require shallow charge shallow discharge. Now use the lithium battery process to try to have a protection circuit, so as to ensure safety. At the same time, lithium iron phosphate battery is a relatively high safety of lithium batteries.


Iron phosphate <a target=_blank href='dghoppt.com'> lithium battery</a> group over-discharge causes and treatment methods


12 series of four and 26650 power lithium iron phosphate battery pack, after discharging for a long time and not charging, the voltage is very low. Now connected to a special charger, showing a green light. Considering the long over-discharge resistance is very large, even if you can punch in the current is also very small, showing a green light is normal. Single lithium iron phosphate dead can be recovered with a charger direct charge. But the battery pack has a balanced punch of the protection plate, will not be charged into it?


Treatment options

Lithium iron discharge curve is very straight, only rely on voltage to discern the power is impossible, balanced only by a single full charge to equalize, full discharge is still not balanced, is the single internal resistance and capacity inconsistent, can only be replaced by sub-capacity to deal with, there is no other way.


First in series with a resistor directly from the battery to charge half an hour, the protection plate is open. Then charge from the protection plate charging port, or think of ways to charge from the discharge port for half an hour, it can be charged normally


Demand charging from the discharge port, pay attention to the polarity do not get reversed, if the red light, on the line. Can also use another group of battery pack to charge him, 36/48 of any, resistance 50 Europe 100 Europe 200 Europe can be charged to more than 30v battery can be charged normally, the hand near the resistance will be hot, not too hot.


If it is still not, you need to consider replacing it.


Iron phosphate <a target=_blank href='dghoppt.com'> lithium battery </a> group over-discharge causes and treatment


In fact, do not compare the battery problems, and then think of ways to deal with them, pay attention to and about the maintenance of the battery is important.


Battery maintenance methods.

1, each time a thorough charge to use, reduce the number of times to charge, to improve battery life.


2, do not need to completely discharge the battery, usually less than 10% of the power needs to be charged.


3, the phone charging process, do not use.


4, do not overcharge, the battery overflow in the future to suspend continuous charging.


If you have requests or queries on batteries, please feel free to contact info@manlybattery.com

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