Which is better for the electric car battery connection, in series or in parallel?

There are the electric car batteries in series and parallel, in order to increase the battery voltage, the series are connected. In order to increase the battery capacity is also used in parallel (such as tricycles often have parallel batteries).

In series is not a good or bad question. Generally, the batteries are 12v. If they are connected in parallel, the voltage is too low.

The series connection is not very good. For example, four batteries are connected in series, and the positive and negative electrodes 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, basically all four pieces are replaced together. Very wasteful

Generally, they are all in series. Some of the old veterans used were not 48 volts, 36 volts, and now they are basically 48 volts.

Powered in series because the motor is 48 amps supply current 48 amps!

Parallel battery packs, especially different specifications, must pay attention to the battery pack. In the parallel system, especially at the end of discharge, the actual voltage difference between each group of battery packs is huge, and it will not automatically adjust the discharge current with the imagination.

Parallel battery packs, the discharge current of each group of battery packs is related to the internal resistance of each group of battery packs and the resistance of the connecting wires. Even the small resistance difference of the connecting wires will have a huge impact on the parallel battery packs.

Can an electric car have unlimited batteries?

Parallel battery system, the voltage difference everywhere in the post-discharge is huge, not the same, this difference is likely to cause over-discharge damage of a certain battery pack.

Different capacity battery packs are discharged in parallel. Although the battery pack with higher voltage will charge the lower voltage battery pack when the discharge is stationary, the charging current will be smaller due to the smaller differential pressure, and the charging current will be smaller, resulting in supplementation. Insufficient, the smaller battery pack ran out prematurely, while the larger battery pack still had power. And you will continue to use it, which will directly cause the battery with small capacity to be scrapped.

Even if the battery pack of the same specification is connected in parallel, it is necessary to consider the wiring of the connection line. If it is simply and randomly connected, the difference in the small connection resistance will also vary greatly in use, resulting in a significant reduction in the life of the parallel battery pack.

It is recommended to discharge in parallel and charge separately. In addition, a set of automatic switching circuit can be used to automatically switch between two groups of batteries. When it is detected that the A battery pack is dead, it automatically switches to B and disconnects A at the same time. This is the best way to use it.

Electric vehicle batteries are generally connected in series and then connected in series, which is more convenient for PACK 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 and 11 pieces, and a total of 176 batteries are composed. , in the middle with copper and nickel connection piece spot welding connection, due to confidentiality, the display of PACK battery pack semi-finished products

The connection of the electric vehicle battery is connected in series, the negative pole of the first battery is connected to the positive pole of the second battery, the negative pole of the second battery is connected to the positive pole of the third battery, and the negative pole of the third battery is connected to the fourth battery. The positive electrode, the negative electrode of the fourth battery is connected to the positive electrode of the fifth battery, and the negative electrode of the remaining first battery and the negative electrode of the fifth battery are the total voltage of the five batteries is 60V.

1. Series circuit: A circuit that combines components one by one in sequence. As shown in the figure, the current flowing through one component also flows through the other. For example: small lanterns in the festival.

In the series circuit, the switch is closed, both bulbs are illuminated at the same time, and both bulbs are turned off, indicating that the switches in the series circuit can control all the appliances. 2. Parallel circuit: A circuit consisting of connecting components side by side, as shown in the figure, is characterized in that the current of the main circuit is divided into two parts at the branch, and flows through each of the two branches. For example: the connection of various electrical appliances in the home.

Expanding data

The advantage of series: In the circuit, if you want to control all the circuits, you can use the series circuit; after one of the series circuits is short-circuited, the other light bulb is brighter.

Disadvantages of series: If one of the circuits is broken, the entire circuit is broken.

The advantage of parallel connection: one electrical appliance can be completed independently, and one electrical appliance is broken, which does not affect other electrical appliances. It is suitable for street lights on both sides of the road.

Disadvantages of parallel connection: If the circuit is connected in parallel, the currents in each place are equal to the total current. It can be seen that the current consumption in the parallel circuit is large. When one bulb is shorted, the other bulbs are shorted.

Expanding information:

First, the series circuit

The components of the electrical appliance are connected one by one in turn, and the access circuit constitutes a series circuit. Our common decorative "starry" small lanterns are often connected in series. The series circuit has the following features:

(1) Circuit connection characteristics: The whole circuit in series is a loop, and each electrical device is connected in turn, without "branch point".

(2) Working characteristics of electrical appliances: Each electrical appliance affects each other. One electrical appliance in the circuit does not work, and the remaining electrical appliances cannot work.

(3) Switch control characteristics: The switch in the series circuit controls the whole circuit, and the switch position changes, which has no effect on the control function of the circuit. That is, the control action of the switch in the series circuit is independent of its position in the circuit.

Second, parallel circuit

A parallel circuit is formed by juxtaposing the components of the electrical device in parallel between two points of the circuit. Household appliances such as electric lights, electric fans, refrigerators, televisions, etc. are all connected in parallel in the circuit. Parallel circuits have the following characteristics:

1. Circuit connection characteristics: The parallel circuit consists of a trunk road and several branches, and has a “branch point”. Each branch forms a loop with each of the trunks. There are several branches and there are several loops.

2. Working characteristics of electrical appliances: In parallel circuits, if the electrical appliances in one branch do not work, the electrical appliances of other branches can still work.

3. Switch control characteristics: In the parallel circuit, the function of the trunk switch is different from that of the branch switch. The trunk switch acts as a master switch to control the entire circuit. The tributary switch only controls the branch it is in.

Third, the difference between parallel and series

1. Series circuit: A circuit that combines components one by one in sequence. As shown in the figure, the current flowing through one component also flows through the other. For example: small lanterns in the festival. In the series circuit, the switch is closed, both bulbs are illuminated at the same time, and both bulbs are turned off, indicating that the switches in the series circuit can control all the appliances.

2. Parallel circuit: A circuit consisting of connecting components side by side, as shown in the figure, the characteristic is that the current of the main circuit is divided into two parts at the branch, and flows through each of the two branches. For example: the connection of various electrical appliances in the home. In the parallel circuit, the switch on the trunk is closed, the switch on each branch is closed, the bulb will be illuminated, the switch on the trunk will be disconnected, the switches on each branch will be closed, and the bulb will not illuminate, indicating that the switch on the trunk can be controlled. The entire circuit, the switch on the branch can only control this branch.

3. Characteristics of series circuit and parallel circuit: In the series circuit, since there is only one path of current, the current flowing from the positive pole of the power supply will flow through the respective electric appliances one by one, and finally return to the negative pole of the power supply. Therefore, in a series circuit, if one of the electrical appliances is damaged or disconnected somewhere, the entire circuit will become an open circuit, the circuit will have no current, and all the electrical appliances will stop working.

4. How to judge whether the electrical appliances in the circuit are connected in series or in parallel: series and parallel are the two most basic forms of circuit connection, and there is a certain difference between them. To determine whether the components in a circuit are connected in series or in parallel, they must grasp their basic characteristics: the specific method is:

(1) Electrical connection method: Analyze the connection method of electrical appliances in the circuit, and connect them one by one in series; parallel between the two points of the circuit is parallel.

(2) Current flow method: When current flows from the positive pole of the power supply, the current flows through each component in series; when it flows through two branches at a certain point, and finally closes together, it indicates that the circuit is connected in parallel.

The page contains the contents of the machine translation.