Why is the battery of an electric car not used in parallel, but in series?

Reason:

The voltage designed by the electric vehicle is 48V. The use of series can increase the voltage, and the parallel voltage will not increase.

Battery:

A battery is a type of battery, also known as a battery, which works by converting chemical energy into electrical energy. The commonly referred to as batteries refer to lead-acid batteries, which are batteries that mainly use lead and its oxides as electrodes and sulfuric acid solutions as electrolytes.

In series and in parallel:

The total voltage at both ends of the series circuit is equal to the sum of the voltage at both ends of each appliance.

The voltage of each branch in the parallel circuit is equal and equal to the power supply voltage.

The series is to increase the voltage, within the permitted operating voltage of the electric vehicle. Parallel is to increase the current, the same reason, as long as it is within the range of electric vehicles allowed. However, from the point of view of actual operation, it is recommended to use series. When used in parallel, the current of the entire circuit will multiply and it is easy to burn the circuit. Moreover, after the power supply is connected in parallel, when the voltage of the two batteries is different, a loop is formed within each battery and the power supply is easily burned. In series, the above problems can be avoided, and it can also be equivalent to increasing the battery capacity.

In addition, you can look at all the places in our home that need to use batteries. They are in series, not parallel.

The series is to increase the voltage, within the permitted operating voltage of the electric vehicle. Parallel is to increase the current, the same reason, as long as it is within the range of electric vehicles allowed. However, from the point of view of actual operation, it is recommended to use series. When used in parallel, the current of the entire circuit will multiply and it is easy to burn the circuit. Moreover, after the power supply is connected in parallel, when the voltage of the two batteries is different, a loop is formed within each battery and the power supply is easily burned. In series, the above problems can be avoided, and it can also be equivalent to increasing the battery capacity.

In series. It's not a good question. In general, the battery is 12V. In parallel, the voltage is too low.

The series is not very good. For example, 4 batteries are connected in series, and the positive and negative poles are connected. The batteries at both ends are easily broken. At this time, the middle two pieces can basically be used. However, in this case, it is basically 4 yuan to replace. It's a waste.

Parallel batteries, especially different specifications, batteries must pay attention to, in the parallel system, especially at the end of the discharge, the actual voltage difference of each battery is huge, and it will not automatically adjust the discharge current with everyone's imagination.

Parallel batteries, the discharge current of each battery pack is related to the internal resistance of each battery pack, as well as the resistance of the connecting line, and even the slight resistance difference of the connecting line will have a huge impact on the parallel battery pack.

Can electric car add battery indefinitely? Introduction to parallel.

In a parallel battery system, the voltage difference between the various parts of the discharge period is large and not the same. This difference is likely to cause over discharge damage to a certain group of batteries.

Can electric car add battery indefinitely? Introduction to parallel.

Different capacity batteries discharge in parallel. Although the discharge is stationary, the higher voltage battery will charge the lower voltage battery. However, due to the small pressure difference and the large internal resistance of the connection, the charging current will be smaller, resulting in insufficient replenishment. One group of small batteries is discharged prematurely, while another group of large batteries still has electricity, so that the meter shows that there is still electricity, and you will continue to use it, which will directly cause the small battery to be scrapped.

Even in parallel with the specification battery, the wiring of the connection line needs to be considered. If it is simply random and connected, the slight difference in connection resistance will cause huge differences in use, resulting in a significant reduction in the life of the parallel battery.

Can electric car add battery indefinitely? Introduction to parallel.

6

It is recommended to discharge in parallel and charge separately. In addition, an automatic switching circuit can be added to allow two sets of cells to switch automatically. When the A battery pack is detected to be dead, it automatically switches to B and disconnects A. This is the best way to use it.

Electric vehicle batteries are generally connected in series and are more convenient for the assembly of lithium batteries. The following is a semi-finished part of a small electric vehicle lithium battery pack made of Panasonic 3350. The battery PACK structure is 16 strings of 11 and a total of 176 cores.. The middle is connected with a copper-to-nickel connection, and due to confidentiality, the PACK battery package displayed is semi-finished.

The power P = U * I, if the voltage is low, the current is large. If the line resistance is certain, P = R * I ^ 2, the power consumed by the resistance is proportional to the square of the current, so the power consumed by the low-voltage power supply line is greatly increased. The power consumed is converted into heat, and heat dissipation is also a problem.

This is why high-voltage transmission lines are used instead of low-voltage transmission.

Because the electric vehicle motor has a minimum power of 350 watts, if the battery is in parallel, the voltage is 12V, and the power is equal to the voltage multiplied by the current, the voltage is small, the motor is kept running, and the current is too large, so the electric vehicle battery is connected in series. of.

The page contains the contents of the machine translation.