4S Lifepo4 BMS 300A continuous current protection board single string 2.5-3.65v balance LED Light | Электроника

4S Lifepo4 BMS 300A continuous current protection board single string 2.5-3.65v balance LED Light | Электроника

Main functions and features:

●Specifications: 106mm in length, 80mm in width and 18mm in height (including the height of aluminum plate)

●Weight: 0.42kg (kg)

●Overcharge protection: 3.65V single cell protection

●Over discharge protection: 2.5V single cell protection

●Continuous current: 300A (300A continuous discharge for 1 hour, the protection board is warm, touch it by hand.)

●Instant current: 600A (Y machine protection is 600A, the starting impulse current is larger, the current exceeding 300A can not exceed 1 second. This is a meaningless parameter made by predecessors. Some boards are marked with 1000A instantaneously, and it is more true. Yes, you really go to 1000A to see if there is blue smoke or blue smoke? Our label 600A is more reasonable. There is an instantaneous current of 200-600A when the car starts. This protection board has almost no overcurrent protection, because the protection board is over The current protection value is set very high, because it is compatible with car start, how to start the car if the overcurrent protection value is set properly?)

●Short circuit protection: not set (to take into account the car start, the short circuit protection can not start the car, so if you don’t set it, the whole row of bombs will not be guaranteed! Don’t say what to do if you are not careful, the kind that dare to say there is short circuit protection, If you have a real short circuit, you may not have time to protect it. Be careful, cautious! Compliance. Only small current can be used for short-circuit protection, and high-current short-circuit protection is not paying attention to user life. You can use two 200A DC circuit breakers. Short-circuit he must jump)

●Temperature protection: 75 degrees (over temperature disconnect charge and discharge)

●Equalization current: 100mA

●Low power consumption: less than 50uA.

●Small internal resistance: less than 8 milliohms

●Charge and discharge port type: the same port (one socket for charging and discharging)

●Cyclic equalization principle: because the charger is charged in series, when only one of the 4 strings is higher than 3.650v, the equalization light will be turned on and the charging switch on the protection board will be turned off to turn off the charger, and then turn on the lighted The corresponding equalization circuit (that is, the 100mA discharge circuit) pulls this voltage down to 3.550v. When the battery voltage is lower than 3.550v, then turn on the charging switch on the protection board, so that everyone starts to charge together and wait for other batteries Also charge to 3.650v, and so on. Until 4 strings are fully charged!, the end of the equalization voltage is 3.500v, it will not discharge until it is lower than 3.500v, and it will stop the equalization, that is, the light you see is off. In the later stage of charging, all the lights are on and it is full.

Problem: There are only a few reasons and solutions for the lights on:

Reason: The consistency of the 2-hand battery is too poor, or the battery is not charged uniformly before assembly, and the battery pressure difference is too large. Which light is on means that the corresponding string of batteries has been charged above 3.50v, and then it will exceed 3.65v, and then the protection board will turn off the charger, and then it will cycle and balance. The light is not on, it means that it is not fully charged. (The battery voltage must be on when the battery voltage is above 3.5v, and it must be off when the battery voltage is below 3.5v)

Solution:
Case 1 The voltage difference is not too much: the voltage is above 3.4v. Don't unplug the charger, charge it overnight and check it out, it's generally well balanced.
The other batteries are not fully charged yet! It's just that some of the batteries are full, and the protection board will cycle and balance. You let him balance and basically all light up for one night. (The protection board has 100mA equalization ability, but its equalization ability is limited)
Case 2 The voltage difference is too large: if the voltage is low or below 3.2 3.3v, a single 3.65v charger should be used to supplement the other battery cells that are not lit to above 3.5v (when using a single charge, please unplug the load and then unplug it. Drop the equalization line to prevent you from burning the protection board by mistake!)


If the supplement is not enough, check if the battery has too much difference in capacity and internal resistance!