How to test the electric car battery itself is good

First of all, look at the appearance, whether it is damaged, whether it is swollen, and then you need a multimeter (check whether the open-circuit voltage difference is very large, because the battery is equipped with a good group by the manufacturer, each group of batteries is to go through several data to match together, the voltage difference is a little large, that is, there is only a backward battery in this group of batteries, if it is very large, that is, there is a battery in this group must be short-circuited or broken), if the multimeter can not be detected, you have to use a high-current discharge measurement meter (check the battery capacity, also used to distinguish short-circuit and open circuit).If it can't be detected, you have to connect the series resistance to discharge and check the voltage difference (if the voltage drops faster than the rest, then this is a battery with a small capacity).The more delicate thing is to take the discharge meter to measure the discharge time.

It's a bit messy to write, and it's roughly just these steps to test the battery.

The simplest thing is to drive the car to voltage protection, turn on the battery pack, and use a multimeter to measure the terminal voltage of each battery, which is the lowest capacity.

1. Observe the outer packaging to determine whether there are traces of grinding and scratching.

When the user buys the battery, the first thing to see is whether the outer packaging of the electric vehicle battery is damaged or there are traces of dismantling, and then open the package to see the appearance of the battery, see if there are traces of abrasion and scratches on the surface of the appearance, and then see whether there are rusts at the metal terminals of the positive and negative electrodes of the battery, and finally, see if the battery has an anti-counterfeiting logo. If one of these items is not satisfied, it is likely to be a refurbished battery, or a battery of poor quality.

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

The two most important technical indicators of lead-acid batteries for electric vehicles are energy storage and internal resistance. The storage capacity should be tested by the instrument for 10A current discharge, and the discharge time should be judged according to the discharge time, and the discharge time of the 20Ah new battery should be greater than 120 minutes before it can leave the factory. The internal resistance should be tested by the internal resistance meter, and when the voltage is in, the internal resistance is about 10 milliohms, which is a good battery.

3. Accelerate the test and observe the pointer falling.

In fact, the easiest way is to test it yourself, first replace the new battery, and then accelerate the driving, in the process of acceleration, if the pointer drops less than half a bar, then it is a new battery. And if the pointer drops more than one or even two notches, then it is likely to be a refurbished battery. And when the pointer drops more than three bars, then the battery is an inferior battery that is close to scrapping.

Finally, I will teach you a way to detect whether the battery is good or bad (take 48V as an example). The first step is to fully charge the battery, then leave the bike for an hour after half an hour of riding, and the second step is to measure its voltage at the charging plug, whether it is a new or old battery, if it is measured to be 48V or a little higher, it is a normal battery. If the measured voltage is lower than 45V, then it means that one of the batteries is short-circuited, and if it is measured at 10V, it means that the group of batteries is broken.

Share how to quickly detect the problem with the electric vehicle battery.

The simplest way also needs a multimeter, at the time when the electric vehicle runs out of power, measure the voltage of a single battery, normal above, if the voltage of a single battery is lower than others, it is broken, and the voltage below is broken.

Use a discharge meter to test whether the battery of an electric vehicle is still durable.

The battery discharge meter is specially designed for electric power, telecommunications, railway, battery manufacturers or other industries to carry out daily maintenance, capacity testing and verification of the load capacity of DC power supply for battery packs (24V, 48V, 110V, 220V, 400V, 600V).

The detection method is a two-step process, and the only instrument used is a multimeter.

First, directly check the output voltage of the car battery. If the battery is 48, adjust it to the voltage level of 60V. If it is 60V, it can be adjusted to a voltage range above 60V and below 220V.

Use the two probes of the multimeter to push to the two electrodes of the battery, if the output voltage of the 48V battery exceeds 50V, there is no need to carry out the second step. If the 60V voltage exceeds 70V, there is no need to proceed to the second step.

Second, if the output voltage of the battery is lower than the rated voltage, then the battery is definitely not durable, indicating that at least one of the battery packs in the battery has been damaged. Open the battery box and test the voltage of the battery after it is fully charged, if it is less than 12V, the battery is broken and no longer durable.

First of all, you see how much ah, if it is small, the power storage capacity is not strong, and then you are asking about after-sales service, to see if what he said is in line with the basic principle, and there is an indicator light on the battery, which will turn green after being fully charged, black represents basically usable, and white represents that it has been broken.

You can use a multimeter to modulate and detect the DC voltage level, and measure the power of each battery separately when the battery is fully charged or discharged, to see how big the voltage difference of the four batteries is, I remember that the manufacturer's standard seems to be that the voltage difference cannot be exceeded. This is only a way to judge the performance of the battery, and there is also a special discharge meter to detect the actual capacity of the battery. If the battery is 10ah, it is discharged with a current of 5A, and it must be able to exceed 2 hours to be qualified, of course, it must be a new battery.

If the capacity is 12ah, it will be discharged with a current of 6A, which will also be more than 2 hours. Also, your car is now running 30 kilometers, I personally think that it can't be completely said that there is a problem with the battery, it has a lot to do with your riding habits, road conditions, and weather. The most convincing thing is to test the differential pressure after measuring the capacity.

This is how manufacturers test.

How to test the battery of an electric vehicle? Take a 48-volt 500-watt electric car, for example

Determine whether the battery has an internal short circuit (bad battery):

If you have ridden for a while or left for a few hours on a charge, measure the voltage at the charging plug and measure it at 48 volts or a little higher, which is a normal battery (old and new).

If it can only reach 46 volts or less, it means that there is a short circuit in one battery (there are four groups of batteries in a 48-volt car, each group is connected by 6 2-volt batteries in series to become 12 volts), indicating that the 10-volt group is a broken battery.

Note: When there is a short circuit in one battery (only this group of 10 volts in the four groups of batteries), when the total voltage can reach 46 volts, the charger can still display a full green light, but the charging time is longer (there is a slight hazard of overcharging); When there is a short circuit between two or more batteries, charging the batteries below 46 volts with a charger dedicated to 48 volt batteries will never be filled with a green light (all batteries are damaged by overcharging).

In this case, simply replace the less than 12 volt battery packs in the four groups.

Judge the new and old battery, judge the scrapped battery:

48 volt motor 500 watt electric car:

Just after a full charge, if you suddenly accelerate your ride, and the fuel gauge hand falls less than half a bar (one small scale), it is a new battery.

Just after being fully charged, if you suddenly accelerate your ride, and the fuel gauge hand drops one notch, it is a half-new battery.

Just after being fully charged, if you suddenly accelerate the ride, the fuel gauge needle drops 2-3 bars, it is the old battery that is about to be scrapped (it will self-discharge and run out if you don't ride it for half a month when it is fully charged).

Just after being fully charged, if you suddenly accelerate more than four bars, the battery will be scrapped. (If you don't ride for a week when fully charged, the electricity will self-discharge and run out).

If it is a 64-volt 500-watt car that has just been fully charged (under the same power, the higher the voltage used, the lower the motor current).

If you suddenly accelerate your ride, the fuel gauge hand indicates that it is at its maximum and basically does not move, it is a new battery.

If you suddenly accelerate and the fuel gauge hand drops half a bar, it is a half-new battery.

If you suddenly accelerate and the fuel gauge hand drops 1-2 notches, it is an old battery that is about to be scrapped.

If you suddenly accelerate your ride, the fuel gauge hand drops more than 3 bars, and the battery is scrapped.

This is because the newer the battery, the smaller the internal resistance, and under the test of the maximum current of the sudden acceleration, the new and old batteries and the scrapped batteries will appear!

Hello electric vehicle battery to use special equipment to detect.

According to the voltage and current of the electric vehicle battery, different types of testing equipment are selected. Generally, the power of the equipment for testing the battery of the electric vehicle is relatively large (high voltage and high current).

Use the device to control the current of charging (discharging) the battery, monitor the voltage of the battery at the same time, do multiple cycles of charging and discharging, and judge the quality of the battery according to the battery capacity calculated by the device and the displayed voltage-current curve.

There is a dedicated 12V lead-acid battery.

Resistance Discharge Tester.

When the battery level is used to less than 20%, use this measurement to separate the battery packs at 12V each

Connect the positive and negative poles of the battery to the measuring instrument, observe the pointer, if it is kept on the left and right, it is normal, if the pointer drops rapidly, it is broken.