Lithium battery repair method for electric vehicle

The current application of lithium batteries has become very popular. How can we save costs to rejuvenate the "dead" lithium batteries? Let me exchange experiences with you.

The death of a lithium battery is generally divided into three cases.

First, the battery is not charged at all, the charger and the appliance are not recognized, and the electrode has no voltage.

Second. Can be charged, chargers, electrical appliances can also be identified, but only for a few minutes, the power is quickly exhausted.

Third, it can be charged, and the capacity is still sufficient, but the large current discharge voltage drops significantly (for example, the camera shooting mode can only last for a few minutes, and the look back mode can last for a long time)

The battery seems to be "dead", but there is also a high probability of saving. The way I summed it up is to charge the battery with a DC that is equal to the battery design voltage.

This kind of "dead" battery, with the original charger is not charged (no current through), but with a DC power equal to the battery design voltage to charge the battery will find a relatively large current, and this charging current It will slowly decrease, approaching 0 after a few minutes. This is good news: the battery voltage is returning to the design level.

At this time, stop charging, and then use a multimeter to measure the two poles of the battery. Is there a normal voltage?

3. Then you can charge it with your original charger.

4. In this way, I fixed a lot of batteries, and many of them can recover to about half of the design capacity.

In order to completely activate the battery, it needs to be fully charged and discharged several times. The discharge circuit is composed of a resistor and a light emitting diode, and the state of the discharge can be estimated by the light emitting diode.

6. In my experience, this method is very effective for the first battery. In the latter two cases, the battery is difficult to repair, and the information found on the Internet has little obvious effect. In particular, the third type "can be charged, and the capacity is sufficient, but the large current discharge voltage drops significantly (for example, the camera shooting mode can only last for a few minutes, and the look back mode can last for a long time)" A kind of battery, it is a pity to discard it.

Directly measure with a voltmeter if the voltage across the 18650 battery is less than 2.7V or have no voltage. Indicates damage to the battery or battery pack.. The normal voltage is 3.0V~4.2V (the general 3.0V battery will be cut off, the 4.2V battery voltage will be fully charged, and the individual types will also be 4.35V)

3. The battery voltage is lower than 2.7V. You can charge the battery with the charger (4.2V). After 10 minutes, if the battery voltage rises, you can continue charging until the charger is full, and then look at the full voltage.

If the full-voltage is 4.2V, the battery is normal. It should be that the last time the power consumption was too much and the battery was cut off.

If the full voltage is much lower than 4.2V, it means the battery is damaged. If it is a battery that has been used for a long time, it can be judged that the battery life is up and the capacity is basically exhausted. It should be replaced. Basically there is no way to fix it. After all, lithium batteries have a long life, not unlimited.

Electric vehicles have entered thousands of households. For various reasons, the electric vehicle has been used for less than one year, the performance of the battery has decreased, and the mileage of the electric vehicle has not been far away. The replacement of the electric vehicle battery is expensive, and the majority of electric vehicle users are troubled by this. The little coppersmith teaches you how to repair the battery of the electric car without spending a penny, and the capacity is restored to more than 90%. This method is simple and everyone will operate.

Repair the battery with an electric car battery charger:

The voltage and current of the electric vehicle charger are matched with the model and specifications of the electric vehicle battery. Therefore, it is not possible to repair the battery pack with the car charger, and it is only necessary to use the electric car charger with the largest power. Example: 1, electric vehicle battery pack specification is 48v20AH, can be repaired with 60V20AH battery charger; 2, 48v12AH battery pack, can be repaired with 48v20AH battery charger.

Repair principle: The main reason for the decline in battery performance is that the battery has been vulcanized, and the battery manufacturer's after-sales maintenance battery. All kinds of battery repairing instruments and repairers on the market use high-power charging equipment, using "high current, high pressure" to remove sulfurization. , repair the battery. Therefore, the ordinary charger with the power of the first one has the function of removing sulfur from the battery.

Other methods:

Repair the battery with the hot water of the dry cleaner

The majority of electric vehicle users are aware that electric vehicles are not far away and need to add distilled water to repair batteries. However, the pure water and various replenishing liquids and repair liquids sold on the market have a short-term effect on the battery, and then the performance of the battery is degraded and scrapped in advance. Because these liquids contain metal ions and impurities will corrode the battery plates, which cause the battery to self-discharge and the active material to fall off, resulting in permanent battery retirement.

The page contains the contents of the machine translation.