What is the cause of electric vehicle batteries

　　Author ：Iflowpower – Færanleg rafstöð birgir

First, give you all the circumstances that should be prohibited during the use of electric vehicles. 1. If the electric car battery continues to charge for 10 hours, there is no turning light, should immediately stop charging, check whether the temperature of the electric vehicle battery case is hot.

If the words should be repaired as soon as possible, they cannot be sent to the repair, and the total charge time should not exceed 8 hours, otherwise the battery will damage due to expansion deformation. 2. It is forbidden to unload the electric vehicle in the case of unfilled electricity to use electric vehicles 3, prohibiting idle time too long (should not exceed three days, and the remaining electric power should be more than 40% for no loss of loss) 4, prohibit When the undervoltage protection circuit is used, it is only charged 5.

It is strictly forbidden to damage the battery's positive and negative short-circuit electric vehicle battery. First, the important factor of the controller is an important work cycle of electric vehicles. One, that is, the driving process of electric vehicles, and the controller in the driving process controls the discharge parameters of the battery, so it is also an important factor affecting the service life of the battery.

And people tend to ignore this factor, which will affect the liability of electric vehicle battery recycling life, and blame the battery and charger manufacturer, so that the battery and charger manufacturer have suffered a lot of people. Second, the cause of the electric vehicle battery charger (charging without lightning) 1, the charger parameters do not match, drift; 2, line problems; 3, battery factors: downtime, there is a single short circuit in the battery, vulcanization is more serious. Test method: 1.

Check if the charger is damaged, whether the charging parameters meet the requirements (some people use 48V chargers to charge 36V battery packs) See if the voltage is high (14.8V / or more or the trickle conversion current is low) 2, check if the charging circuit fuse is in good contact, the fuse holder has a burnt traces, check whether the connection plug is good, including the socket of the car of the charger. 3, check if there is dry phenomenon inside the battery, that is, the battery is absent.

The dry battery should add pure water or 1.05 g / cm3 dilute sulfuric acid to repair the maintenance and discharge, and measure the monobic voltage to see if there is a single short circuit. 4, should also check if the polar is inversely reversible sulfate.

If the vulcanization is severe, the internal resistance increases, and the charging will cause serious heat. 5, the non-reversible sulfate of the plate can determine the change of its end voltage by charging and discharging. When charging, the voltage of the battery has a rapid rise in voltage, some single-handed voltage is particularly high, and the voltage drop is particularly fast.

In the above case, it can be determined that the battery has irreversible sulfate. If it is found that there is irreversible sulfate, a balanced charging method shall be repaired. 6.

The maximum discharge current of the battery is for more than 150% of the rated capacity is like 6-DZM-10 often said the 12AH battery. The maximum discharge current is 10150% = 15A, if it is a 6-DZM-17 battery The discharge current is large for approximately 25A, if it is a 20AH battery maximum discharge current of 30A, which limits the size of the controller limit value. Suggestions: 1, it is best not to use electric vehicles without uncharged electricity.

There is also a note that the light should not mean that the battery is fully charged, almost 95% 99% should continue to float 1-2 hours to full. 2, make timely charging, the idle time is preferably no more than 12 hours, and the corresponding floating time should be added. 3, less use, it is best to use 50% -80% and then charge, which is conducive to extending battery life.

4. After the battery is used, every 2 months, preferably constant current charging once, the current size is C15 time 20 hours. 5, less pull, speed does not open too fast, reduce battery discharge current.

6, slow acceleration, reduce the impact of the large current to the battery, controller and motor. Third, the important factor of the motor is a device that converts the electric energy of the battery in the electric bicycle. The motor has a part of the energy in this conversion process to be consumed by the conversion efficiency of the motor.

The motor is operated in different current sections. Different conversion efficiency, generally each electric vehicle factory set a maximum operating current according to different electric vehicles, when external load is large, the operating current of electric bicycles reaches the maximum, the input power reaches the maximum, for example: an electric car The maximum operating current is set to 12A, the maximum input power of 36V is: 12 * 36 = 432W, if the motor can reach 85% in the case of 432W input power, the output is 432 * 0.85 = 367.

2w new car used for a while The power and efficiency of the motor gradually decreases over time, it is possible to be 75% 65% 55% depending on the quality of the motor. At this time, the maximum output power of the motor is only 432 * 0.65 = 280.

8w432 * 0.55 = 237.6W The performance indicators of the whole vehicle will decrease, and the deterioration of motor electric drive systems causes the increase in battery operating current, and if there is poor efficiency characteristics, if there is two or more malignant uses, the motor The permanent magnet will have a serious demagnetization.

The efficiency characteristics will be deteriorated. It has caused the battery operating current to increase sharply, and the discharge time has dropped sharply and makes the continuous mileage. The customer mistakes the battery capacity has declined.

Some users have replaced the new battery, the continuation mileage of the whole vehicle is still inadequate, which means that it is not necessarily the problem of the battery. 4) The self-discharge of the battery cell in the lithium-duty lithium battery module will affect the life of the lithium battery, due to the inconsistency of self-discharge, the lithium battery cell capacity is inconsistent. When the lithium-powered lithium battery module is in a state of charge, the low capacity of the lithium-powered lithium battery cell is high, and the temperature is increased.

When the charging voltage set value is reached, the charging will be terminated. The core of the contents of the lithium battery module is large, because its charging voltage is slow, the end voltage is not reached, due to the termination of charging, it has not been filled with electricity. In the long run, the lithium battery module will result in a decrease in capacity, causing a lithium-powered lithium battery module to fail in advance.