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18650 common faults of lithium batteries, lithium batteries produce common failure root cause

by:dcfpower     2020-11-07

the rapid progress of science and technology level as time goes on, the using area and function of lithium-ion batteries have no doubt, but in everyone's life daily life phenomenon of lithium battery pack safety accidents often are constantly emerging, interfered with you. 18650 lithium batteries have abnormal reason, involving 18650 lithium battery capacity, 18650 lithium battery internal resistance, 18650 lithium battery pack voltage, shape size of super thick, short circuit, etc. , we are making a simple battery small make up to amway, these abnormal reason in the process of production will meet from time to time, we sincerely invite users timely supplement ~

18650 common faults of lithium batteries, lithium batteries root cause common faults mainly as follows:

1, low battery voltage

battery testing when charged, because the loop resistance or test tank charged current leads to batteries charged imbalance. Store in a short time to measure the voltage difference is small, but when stored for a long time working voltage difference is very big, the low voltage and no quality problems, can use the battery. In production stored over 24 hours after charged voltage measurement.

root cause common faults: (1) data acquisition deviation; (2) LMU balance function is poor or doesn't work; (3) batteries self-discharge rate; (4) low batteries capacity, discharge when the working voltage reduce rapidly.

2, lithium battery pack life short

the battery pack at the end of the service life of the use of the service commitment of time, the condition is poor because of the unity of the battery pack or battery pack individual series battery performance is very poor, cause the battery when the battery is not satisfied, can't let again when discharge end.

。 Not to turn into good ( SEI coating is compact and incomplete) ; b。 Baking temperature is too high & rarr; Adhesive aging & rarr; Stripping; c。 The cathode low specific capacity; d。 The positive FuLiao outnumbered negative FuLiao; e. Blocks air leakage, weld leakage; f。 The electrolyte decomposition, conductivity decreases.

3, battery bulge, battery explosion

a stimulating smell screws black leak leakage, batteries become soft, precipitation, curing temperature is too high, off the ear. Excessive charging a pass.

common fault reasons: (1) battery common faults ( Working voltage, temperature, insulation and other anomalies) ; (2) the BMU common faults ( Charging module or the battery CAN happen) ; (3) the main negative abnormity, battery charging relay; (4) CC to ground resistance, CP abnormity of working voltage; (5) PE an exception occurs.

4, all of a sudden stop in battery using electricity, the battery short circuit

the likelihood is lithium battery electric is put, the minimum standards for protection board or panel floor working voltage, protection board or panel to stop work; Or the continuous working current has a lot more than the design of protection plate protection or control panel continuous current protection board or panel to stop working, and this will lead to battery suddenly stopped working.

common fault reasons: (1) battery common faults ( Working voltage, temperature, insulation and other anomalies) ; (2) the BMU common faults ( Charging module or the battery CAN happen) ; (3) the main negative abnormity, battery charging relay; (4) CC to ground resistance, CP abnormity of working voltage; (5) PE an exception occurs.

5, battery temperature anomalies

if the lithium battery when battery charging or discharging temperature anomalies, for example, the temperature too high. Produce the reason of this situation may cause mild short-circuit phenomenon is lithium battery internal structure.

common fault reasons: (1) hall sensor and its input and output circuit; (2) hall sensor against loading; (3) the battery if the BMS needs to work with dc voltage or current is zero, the charger according to minimum conversion ability.


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