Why is it that the electric car is obviously fully charged, and as soon as it turns the acceleration knob on the road, the power gauge will drop two bars of electricity? If you think the battery is broken, push the electric car to the repair shop, and the master of the repair shop will usually ask you to replace the battery. In fact, this situation is mainly caused by 4 reasons, and the following will introduce these 4 reasons in detail, and then share the solution.
1. The battery connection line falls off, loose or has poor contact: the lead-acid battery used in electric vehicles is divided into 12 amps, 20 amps, 32 amps, etc. according to the capacity, except for 120,000 soldering, and more than 20 amps are tightened with screws. There are two screw holes for the positive and negative poles to fix the positive and negative pole connecting wires, if the positive and negative electrode connecting wires are not tightened when installed, with the extension of the use of the electric vehicle driving on the high and low road surface will vibrate, the battery will jump in the battery compartment, and the screws of the connecting wire may be loosened and there will be poor contact, resulting in the battery being fully charged, and the power of discharge will also be affected, and there will be a situation where two grids of electricity will be dropped as soon as it accelerates.
Another situation is that with the extension of the use time, the sulfuric acid inside the battery overflows from the positive and negative electrodes and appears vulcanization, which will also lead to poor contact, affecting the normal charging and discharging function of the battery, and there may also be a situation where two bars of electricity will be lost as soon as it accelerates. There is also a situation that is more special, the positive and negative connecting wires of the battery are pressed by the pressing plate of the fixed battery, with the extension of the battery use time, when the electric vehicle passes through the uneven road surface fixed plate and the connecting line will rub back and forth, which may cause the connection line to break or poor contact, and will also affect the normal charging and discharging of the battery, and there will be a situation where two grids of electricity will be dropped as soon as it accelerates.
Solution: Open the battery compartment and carefully check the positive and negative electrode connecting wires, and find that the positive and negative electrode screws can be tightened with a screwdriver, if you find that the positive and negative electrode oxidation screws are unscrewed, use sandpaper to polish the positive and negative electrodes and connecting wires smooth, and then replace them with new screws and tighten them. During the inspection, if it is found that the positive and negative electrode connecting wires are broken or the contact is poor, please ask a professional maintenance master to replace them with new positive and negative electrode connecting wires. Be especially careful when changing the line, do not short circuit the positive and negative poles, it is best to turn off the leakage protector, and turn off the key power before performing the above operations.
2. There is a problem with the charger: the charger of the electric vehicle is a precision electronic component inside, many friends often put it in the seat of the electric vehicle, and when the electric car is out of power, you can take out the charger in time to charge the electric vehicle. But although it is convenient to put the charger in the bucket for a long time, there is also a bad problem. It is the electric vehicle driving on the uneven road, the bumps and vibrations caused may cause damage to the electronic components inside the charger in the vibration, which may affect the normal charging function of the charger, resulting in the battery being fully charged, and the power will be lost quickly as soon as it accelerates.
Solution: If the lead-acid battery of your electric vehicle has not been used for more than two years, it only takes two hours to plug in the charger and the charger will have a red light and a green light, which can be the charger is damaged, and the charger should be replaced in time. When replacing the charger, it must be matched with the original charger, because the original charger and the charging voltage and current parameters of the battery pack are matched, which can maintain the battery performance and extend the battery life. Remember that especially if the charger of the lithium battery is damaged, be sure to buy the same model with the same parameters.
3. Unbalanced battery pack voltage: With the extension of the use time of electric vehicles, the middle battery may be damaged, resulting in unbalanced battery pack voltage. Why does the middle battery break? Because the battery compartment of an electric vehicle is tailored to the size of the battery. The 48-volt electric vehicle is the model with the lowest voltage, which is made up of 4 12 batteries in series, one of the four batteries is affected by the batteries on both sides, the heat dissipation space is very narrow, and the heat generated in the process of charging and discharging is not dissipated in time, resulting in the temperature of the intermediate battery being higher than that of the batteries on both sides, and the high temperature will cause the electrolyte inside the intermediate battery to decompose into hydrogen and oxygen, which will lead to the drying up of the electrolyte and the sharp reduction of the capacity of the battery after a long time.
When charging, the charger will stop working when it detects that the middle battery is fully charged, because the charger is charged according to the balance of the whole group of batteries, and when one of the batteries in a group has a problem, the charger will not be able to complete the normal charging. The red light of the charger will turn into a green light when it is plugged in for an hour or two, because one or two of the batteries are damaged, which affects the charging and discharging of the entire group of batteries.
Solution: Push the electric car to the repair department, let the master open the battery compartment, measure several batteries, and the master who repairs the electric car will use an instrument to detect the internal resistance of the battery. The normal battery internal resistance should be below 10, if the detected battery internal resistance is higher than 15 or even 20, then the battery needs to be replaced, only need to replace the damaged battery in the middle, and replace it with an old battery that can be used, so that a group of batteries can be used for a period of time.
4. Battery aging: There are three main types of lead-acid batteries used in electric vehicles, and the ordinary lead-acid battery with a single weight of 6 kg can be charged and discharged 350 times, with a theoretical service life of one and a half years. A single 6.5 kg battery can be charged and discharged 500 times, and the theoretical service life is two to three years. A single graphene battery weighing 7 kg can be charged and discharged 1000 times, with a service life of 3~5 years.
If the battery you replace reaches the above service life, the battery is aging because the battery capacity is reduced, which will lead to a shorter charging time. At this time, you only need to push the electric car to the repair department and let the master replace a new set of batteries for you. When choosing a battery, it is recommended to choose a single graphene battery with a net weight of 7 kg, although the price is a little more expensive, but the service life is long.
Summary:
With the extension of the use time of electric vehicles, the charging time becomes shorter and the power drops two bars as soon as it accelerates, mainly due to loose or oxidized screws of connecting wires, charger failure, unbalanced battery voltage, and natural aging of the battery. You can use the methods described in this article to inspect and solve problems in a timely manner. In addition, if there is an acceleration in winter, it is normal to call two bars of electricity, because in winter, the battery electrolyte is slowed down due to low-temperature chemical reactions, and it is normal to drop two bars of electricity when there is an acceleration, and the fuel gauge will return to the same as before when the electric vehicle returns to normal speed.
In order to prolong the service life of the battery, it is recommended that you choose a graphene battery of a certain weight when replacing the battery. Every time you use an electric vehicle, you should charge the battery in time when the battery power is used for 20%~30%. As soon as the normal driving power gauge accelerates, there are two bars left, which is the best time to charge. When charging in summer, the red light of the charger turns green, and the power supply should be cut off in time, and the electric vehicle should be pushed to a warm place to charge in winter, and the red light of the charger should be extended for another hour, and then the power should be cut off in time. Remember that the normal charging time of lead-acid batteries is 8~10 hours, and the charging time should not be too long, and do not let the battery be deeply discharged. Knowing the right charging method can maximize the life of your battery.