How to judge the quality of electric car battery?

1. Watch the battery old and new:

In fact, this is a very good judgment, generally get the hand, look at the appearance can judge, whether there is grinding, scratching

Traces then look at the metal parts of the battery positive or negative rust.

2. Use a professional measuring voltage tool to determine whether the battery has an internal short circuit (bad battery):

After riding for a while or charging for a few hours, the car is measured at a charging plug and the voltage is measured.

48 volts or a little higher is a normal battery (regardless of old and new). If it can only reach 46 volts or less, it means there is one

There are short circuits in the battery (four groups of batteries in 48 volts, each group consists of 6 2 volt batteries connected in series to 12 volts)

This group of 10 volts is a bad battery.

3. Determine the scrapped battery:

1) After the battery is fully charged, if the speed is suddenly accelerated, the battery gauge needle will only fall less than half a grid (a small scale).

It is a new battery.

2) After the battery is fully charged, if it suddenly accelerates the ride, the battery gauge needle falls to the grid, which is the old and new battery.

3) After the battery is fully charged, if it suddenly accelerates the ride, the power gauge needle drops 2-3 grids, it is quickly scrapped.

Old battery:(Full of electricity for half a month without riding will also self-discharge running light).

4) After the battery is fully charged, if you suddenly accelerate to ride more than four squares, you will scrap the battery. (Full week without electricity)

When riding, electricity will self-discharge and run).

Buying the quality of electric car battery is the most critical

When purchasing electric vehicle batteries, you should pay attention to the following points: First, pay attention to battery quality, do not use the price as the sole standard for purchasing electric vehicle batteries, because the battery is the key to determine the normal driving of electric vehicles, you should choose a brand with stable performance battery.

The second is to pay attention to the battery production date, it is best to buy the battery recently produced by the manufacturer.

Third, it is necessary to pay attention to the matching of battery capacity and motor power. Under normal circumstances, motors of 180 watts to 250 watts should be equipped with batteries of 10 to 12 Ah and motors of 350 watts should be equipped with batteries of 17 to 20 Ah. Fourth, we should try our best to go to the merchants with good reputation, large scale, and complete licenses, and obtain relevant documents such as official invoices and after-sales service cards from the merchants, and fully understand the product quality and service content promised by the manufacturers, and whether there is a perfect after-sales service system.

Easy way to diagnose battery faults:

First, check the outside of the battery. The outer casing should be free of large cracks and no leakage. The electrolyte overflow will cause the liquid level to be too low, resulting in a decrease in battery capacity. The surface should be clean, the poles are not corroded, and the positive lead (hot wire) should be well insulated, otherwise, self-discharge will occur. The joint should be loose and the grounding should be secure, otherwise, the output impedance will increase and the output power will be reduced.

Next, you can turn on the headlights to check. If the light is white, the battery is normal; if the light is red, it indicates that the power is insufficient. Turn on the starter. If the rotation speed is normal, the light will be slightly darker, but there is still enough brightness, indicating that the battery is good and the charging is sufficient. If the starter appears to be weak and the light becomes very dark, the battery should be over-discharged. Charging immediately; if the light is turned red when the starter is turned on, and the engine is turned off, the battery discharge has exceeded the limit or the plate has been severely vulcanized.

If it is checked that the battery is faulty, it should be disposed of immediately to eliminate hidden dangers in time.

The page contains the contents of the machine translation.