How do you repair the lithium battery properly?

The lithium battery bought on the internet, used only for half a year, the battery life dropped sharply. You cannot find the seller. Through the replacement of lithium battery unit, repair as ever, friends with strong hands-on ability, please contact and share maintenance experience. Because the maintenance of lithium batteries is a little risky, don't try it if you are not good at it.

A lithium battery electric vehicle is a lithium battery electric vehicle, and is an electric vehicle equipped with a lithium ion battery. In recent years, the environmental problems caused by traditional internal combustion engine vehicles and the shortage of petroleum resources have led people to invest in new energy vehicles. Pure electric vehicles have become an important development direction for electric vehicles because they can truly achieve zero emissions. Lithium-ion batteries have become the ideal power source for a new generation of electric vehicles with their excellent performance.

The conventional structure of a lithium ion battery includes a graphite anode, a cathode composed of a lithium ion metal oxide, and an electrolyte (a lithium salt solution in which an organic solvent is dissolved). The most common lithium-ion battery uses carbon as the anode, dissolves lithium hexafluorophosphate solution as electrolyte with ethylene carbonate and dimethyl carbonate, and uses lithium manganese oxide as cathode; light and strong, with large specific energy, the cell voltage is about 3.7V.

Compared with nickel-metal hydride batteries, lithium-ion batteries have a relatively high operating voltage and a large specific energy, which is three times that of nickel-metal hydride batteries. Lithium-ion batteries are small in size, light in weight, long in cycle life, low in self-discharge rate, no memory effect and no pollution; the range of values of individual battery performance indicators is large, because lithium-ion batteries have more electrode combinations, they are There are some differences in performance.

Lithium-ion batteries can be classified into two types: lithium ion batteries and lithium polymer batteries. The cathode materials of lithium ion batteries mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium iron phosphate, etc., and the anode materials mainly include graphite, lithium titanate and the like.

Measure 4 batteries to the protection state to see which battery voltage is the lowest compared with other sections. Remove the battery and charge it separately with a 12 volt charger. Charge it for 2 hours at 2 amps. 12 volts and 25 watts of the bulb discharge to 10 volts, calculate the discharge time, see if the battery can be discharged for more than 6 hours; do a few more cycles to see if there is any improvement. If the discharge time is too short, you will need to replace this section. It is also possible to do some experimental things such as adding distilled water and sulfuric acid before the replacement. The other sections can also be recharged in a single section, and the actual calculation of the power of these sections is repeated several times. The 20 ampere battery should discharge for 10 hours according to a single 2 ampere discharge current.

Method 1: 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 48v 20AH, 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.

Operation steps: 1. Borrow (find) an electric vehicle charger that is one power larger than the electric vehicle battery to be repaired.

2. The power of the first charger to charge the electric car to be repaired for 4-6 hours.

3. After charging, the battery capacity will be restored to more than 90% after standing for several hours.

Method 2: Repair the battery with the hot water of the dry cleaners

The majority of electric vehicle users are aware that electric vehicles are not far away and need to add distilled water to repair and 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 can corrode the battery plates, causing the battery to self-discharge and the active material to fall off, resulting in permanent battery retirement.

The loss of water in the battery is the starting cause of the failure of the lead-acid battery. The electric vehicle that is charged with the three-stage charger will lose water after about 6 months. During the use of the battery, the water in the electrolyte is not sulfuric acid, and the replenishing solution (dilute sulfuric acid solution) is added to increase the specific gravity of the sulfuric acid in the electrolyte. Although the battery capacity is temporarily increased, the battery is vulcanized and then scrapped. Therefore, the electric vehicle battery can only be filled with pure distilled water and absolutely no other liquid can be added.

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