How to judge the quality of electric vehicle batteries?

1. If you find that the electrodes of the battery have white or blue-green powdery crystal accumulation, use a wire brush and sodium bicarbonate solution to clean the electrodes in time to ensure that the electrodes and cables are in good contact.

2. Check whether the battery is safely fixed on the battery rack, if there is looseness, tighten the fixing bolts, excessive shaking will shorten the service life of the battery.

3. Regularly check whether the electrolyte in the battery is reduced, if necessary, add distilled water, but do not excessively, the normal liquid level height should reach the bottom of the water injection hole.

4. Check whether the battery wire is tightly connected to the electrode, as loose joints will cause the car to fail to start.

5. Carefully inspect the shell of the battery, if the battery has cracks, it needs to be replaced in time to prevent corrosive electrolyte leakage.

Do durability test, rush enough to bring people to run: now the life of the general electric vehicle battery is more than a year, try to choose the products of famous brand manufacturers, go to regular stores to buy, to avoid buying refurbished batteries.

In fact, as long as it is a new battery, it is almost the same, the key is to pay attention to the future use, in order to prolong the service life. Here are some ways to maintain the battery:

1. The battery should be installed firmly on the electric bicycle to prevent the battery from being damaged by vibration when riding.

2. Frequently remove the dust and dirt on the battery cap, and pay attention to keeping the battery dry and clean to prevent the battery from discharging itself.

3. Never let the battery be in a state of insufficient power for a long time, and develop a good habit of charging the battery every night.

4. When the electric bicycle has just started, it should be started with pedal power to avoid damage to the battery due to excessive discharge current.

5. When riding, pay attention not to let the battery discharge, over-discharge is easy to cause serious power loss of the battery, thereby greatly shortening its service life. Electric bicycles are generally equipped with under-voltage protection function, when the battery power display only one indicator light is on, the battery should be charged immediately to avoid over-discharge of the battery.

The method of judging the quality of the tram battery is as follows:1Judging by the external packaging of the battery:

1) Check whether the outer packaging is damaged or has been opened. (2) Check the appearance of the battery itself, and observe whether there are scratch marks and whether there are rust on the terminals of the positive and negative electrodes. (3) Check whether there is an anti-counterfeiting label on the battery shell, whether the production date is relatively old, whether the manufacturer's relevant information marks are complete, and whether the writing is clear and complete.

2.In the trial process, the advantages and disadvantages of the battery are detected - the battery that has just been fully charged is installed on the electric vehicle, the power supply of the electric vehicle is started, the electric vehicle is suddenly accelerated during driving, and the changes of the fuel gauge pointer are observed: (1) The pointer of the fuel gauge only falls less than half a bar during the acceleration ride, then it is judged that the battery is brand new or has good performance.

2) If the pointer of the fuel gauge drops 1 bar or even 2 bars during accelerated riding, it is judged that the battery is old or of poor quality. (3) If the pointer of the fuel gauge falls by 3 or even 4 bars during the acceleration ride, it is judged that the battery is a product of counterfeit new battery after the repair of the scrapped battery, and the quality is extremely poor.

There are three ways to judge the quality of a battery car battery:

1.Observe the outer packaging to determine whether there are any grinding marks and scratches;

When users buy batteries, they should first look at whether the outer packaging of the electric fiber eggplant is damaged or have traces of disassembly, and then open the package to see the appearance of the battery, see if there are traces of wear and scratches on the outer surface, and then see whether the metal terminals of the positive and negative electrodes of the battery are rusty, and finally see whether the battery has anti-counterfeiting marks. If one of them is not satisfied, it is most likely a refurbished battery or a poor quality battery.

2.Test the discharge of the battery with a detector:

The two most important technical indicators of lead-acid batteries for electric vehicles are storage capacity and internal resistance. The storage capacity should be tested by the instrument for 10 years of current discharge. According to the discharge time, a new 20ah battery can be discharged for more than 120 minutes before leaving the factory.

The internal resistance should be tested by an internal resistance meter. When the voltage is and the internal resistance is about 10 mOhm, it is a good battery.

3.Speed up the test and observe the position of the pointer:

Replace the new battery first, then accelerate the drive, and if the pointer drops less than half a bar during the acceleration process, it is a new battery. And if the pointer drops by more than one or even two, it is likely to be a refurbished battery. And when the pointer drops more than three bars, the battery is an inferior battery that is close to being scrapped.