How do you detect the battery quality of electric vehicle?

Test the no-load voltage of the battery with a 12V detector, and the good no-load voltage of the battery is about 13.2v. If it is around 12V, it means the battery is out of power and needs to be charged. If it is around 10V, it means one grid is damaged. If it is around 8V, it means two grids are damaged. If it is below 8V, it may be vulcanized or severely lose power.

How to detect and repair electric car battery

Load voltage detection, press the test button to load voltage should be in more than 8 v, if the speed limit in 8 v and loosen the button voltmeter recovered to more than 12 v, means that the battery has broken or serious aging.

How to detect and repair electric car battery

To detect the single voltage, insert the single detector six pens and in turn into six inside, press the test button, observe the seven table reading changes, the voltage drop is more than the other, which shows that the corresponding lattice damaged, out of the battery to repair manual open shell.

This method is not good, when the voltage measured out must be the same as the three blocks and are normal. If you really have no other tools, can be like this: when electricity is going to run out, to the rear wheels of the car overhead (for measurement purposes), will be the battery open positions, then start the car (overhead, car to walk not bubble, is in the idle), at the same time, the battery voltage is measured with a multimeter . If which significantly less than 12 v battery or was obviously lower than other batteries, means that the battery is bad, and if the three are all the same, and it is normal, and you are sure that your battery is a broken, shows you the battery discharge is incomplete, should put some toilet after electric quantity

To match the electric vehicle battery disconnect, with high rate discharge meter (cross) is also called the discharge test battery, respectively for each single battery test. According to the test result judgment the battery of electric vehicles is one of them is damaged, or the whole damage. The operation method of high rate discharge meter (also called discharge fork) and the judgment method of battery quality can refer to the instruction manual attached to the discharge fork.

Electric vehicle battery in the product life cycle, with the exposure test environment is facing various environmental factors, lead to battery products in a long time under the environmental effect of accelerated aging, make the battery in normal use cycle generating failure, especially in the harsh temperature and humidity environment, the battery may be because of the influence of the environment has changed the original function or charge and discharge characteristics of a design, and may lead to traffic safety.

Electric vehicle charging note:

1, Private pull disorderly wiring, once the line fault, easy to cause fire;

2, Change the car electric circuit, to replace the large capacity battery, easy to cause the wire overload, short circuit, etc.

3, Purchase the charger with inferior quality or the charger that does not match the original battery, which is easy to cause electrical fault;

4, aging cells continue to use, a mixture of different capacity batteries, easy to cause fire;

5, Electric vehicle enclosure, cushion, lamps and lanterns are made of polymer materials, which burn fast and produce a lot of toxic smoke;

6, Some do not have production conditions assemble electric cars privately for sale, and randomly select lines and batteries. In addition, unreasonable assembly technology lacks quality control.

According to the following method to check, if do not have the following problem is normal.

First of all, the appearance can be used to check whether there is swelling, leakage, burning loss and other abnormalities, when the battery failure cannot be judged in an intuitive way, it is necessary to carry out open-circuit voltage test and battery capacity test on the machine. Need on the machine, need to carry out open circuit voltage test and on the machine for battery capacity detection of the battery is divided into abnormal voltage battery, over discharge battery, discharge time abnormal battery, charging heating battery.

The classification of the abnormal voltage battery and testing methods

Abnormal voltage battery generally divided into voltage without current and voltage and current.

For voltage and current of battery, general judgment for the manufacturing reasons, this kind of batteries are characterized by a multimeter is used to measure the voltage, when the computer test capacity, battery discharge current drops rapidly, or short discharge capacity, generally less than 60 minutes namely discharge end.

For no voltage and no current of the battery is also known as the open circuit battery, this kind of battery detection multimeter measurement of a single battery open circuit voltage display is 0V, can be determined as the open circuit battery. Or use a multimeter to measure the voltage of a single battery, use the car charger to charge a single battery to be tested for more than 10 minutes, and then use the resistance value of 1~ 1.5ohm to the single battery to be tested for a constant resistance discharge, or a constant current of 10A~15A discharge, discharge 10 seconds, the battery terminal voltage is 0V, that is to say, judged as open circuit.

Discharge cell classification and detection method

After discharge the battery generally divided into single discharge, and the whole discharge two classes.

Over discharge battery typically require two open circuit voltage measurement can determine, while the group's only a battery in the open circuit voltage is lower than 10.5 V, other voltage were higher than 10.5 V, can be judged as single discharge; When the battery open circuit voltage is below 10.5 V, for the whole or the whole total open circuit voltage of the battery under the total voltage of 10.5 * N (such as total four pack voltage is lower than 10.5 * 4 = 42 V), can discharge judgment for the entire group.

Discharge time anomaly classification and detection method of the battery

Abnormal discharge capacity battery is divided into the whole capacity lack and large difference of the capacity for the whole two kinds.

Adopting the battery capacity test, the battery for at least 2 times put single charge, according to the test results.

Battery after reach discharge time, if cannot reach the same standard, or in terms of consistency (the whole battery discharge time lag between), in the new period > 10 minutes, in spare time > 15 minutes, as long as meet one (or all meet), which can be judged to be lag behind.(discharge time need to refer to environmental test temperature.

Detection of rechargeable heating cells

The detection of rechargeable heating cells, only need to put in room temperature after the battery recharged again, if at the beginning of the rechargeable battery (4 hours down the corresponding charging electric charge) with severe fever phenomenon (above 50 ℃ temperature).

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