Lithium batteries for electric vehicles have become the norm, due to the different performance from lead-acid batteries, little is known about how to properly use and maintain lithium batteries, when driving for a period of time after the electric vehicle lithium battery range shrinks significantly, how do we determine whether the electric vehicle lithium battery is selected for repair or re-purchase? What are the methods of repairing electric car lithium battery? Next, I slowly give you a description.
Li-ion battery capacity drop causes
1. aging and decline of the battery cell
2. Self-discharge rate is different, resulting in the imbalance of the power of the series of cells, ultimately leading to the reduction of lithium battery capacity is not durable
3. In the process of battery use and charging and discharging, the phenomenon of "sulfation" will occur to affect the capacity of lithium batteries
Battery sulfation is manifested as follows: low voltage of the battery itself, full after charging for a while, and gone after discharging for a while
Battery softening is manifested as: the internal liquid of the battery is cloudy and black. Battery capacity decreases, and lead powder falls off after a long time
4. Improper charging in summer and winter. Battery charging voltage and ambient temperature is inversely proportional to the relationship, so the summer temperature, battery overcharge caused by battery water loss, resulting in battery bulging, deformation. Undercharge in winter causes a decrease in driving range
Electric car lithium battery common failures and repair methods
I. Battery water loss failure
Its main performance battery capacity decline, which leads to thermal runaway and positive plate deformation, battery shape expansion.
Repair method: pry open the cover above the electric car battery; open the rubber cap to reveal the venting hole; observe whether the electric car battery is dried up through the venting hole, if there is water replenishment. In addition, it is recommended to use medical disposable syringe and secondary distilled water, adding water needs to be operated carefully, not enough to add again.
Second, the battery imbalance failure
Its main manifestation is the appearance of one or more small batteries in the battery pack has been a problem, and lead to other good batteries can not be used normally.
Repair method: for the battery imbalance fault, the user can find the capacity, voltage, self-discharge, battery resistance and other consistent battery together.
Third, the battery sulfation failure
Its main performance is the generation of white hard lead sulfate crystals on the pole plate, and very difficult to convert into active material lead sulfate when charging.
Repair method: You can use the repair instrument to repair, by measuring the battery state, in the process of charging and discharging constantly emitting positive and negative frequency particle waves, through about 15 hours, you can remove the hardened lead sulfate after crystallization in the battery. However, it is important to note that this is generally only applicable to minor sulfation. And if the sulfation is more serious, it is necessary to replace the new battery.
Fourth, the battery polar plate softening failure
The main manifestation is the surface of the positive plate from the beginning of the solid gradually become soft until it becomes paste, at this time due to the decline in surface area, will lead to a decline in battery capacity.
Repair method: After discharging the battery to 10.5V, use the bulb to discharge deeply for 1 to 5 hours. Then use the activation instrument and activate the repair. In this case, there is a certain chance that can be repaired, but the situation is heavy, you can only replace the new.
V. Battery short-circuit failure
The main manifestation of the short circuit at the tiny lead blocks touching the positive and negative polarity caused by their own discharge, seriously affecting the battery life.
Repair method: the short circuit at the lead slag lead block removal, from the newly installed spacer paper can be restored to repair.
Sixth, the battery open circuit failure
The main performance of the circuit for a certain place due to disconnection and make the resistance is too large, the current can not pass normally.
Repair method: use a multimeter to check the internal connections of the battery, find the disconnection, and then re-weld it.
Now the electric car users a lithium battery failure problem is to take to the repair store, business after-sales replacement of new lithium, or some electric car repairman, some forums, website gods in the face of some electric car lithium battery users ask the problem of lithium battery repair, is also a bite that can not be repaired, only to replace the new.
In fact, in daily life, but also to increase the maintenance of lithium batteries, so that you can maximize the battery life. In addition, if you encounter lithium battery failure can not be solved, it is recommended to go to the repair point as soon as possible to avoid causing new problems.
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