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The purpose of parallel connection of lithium batteries is to increase capacity, therefore, parallel charging of lithium batteries also has different design characteristics compared to single cell lithium batteries, mainly reflected in the consistency between charging current design and parallel batteries.

The characteristics of parallel lithium batteries are: constant voltage, added battery capacity, reduced internal resistance, and extended power supply time. The core content of parallel charging is the magnitude and function of the parallel current. According to the parallel theory, the main current is equal to the sum of the currents of each branch. Therefore, in order for n parallel lithium batteries that have been combined into a battery pack to achieve the same charging efficiency as a single battery, the charging current should be the sum of the currents of n lithium batteries. Under the formula of Ohm's Law: I=U/R, this design is reasonable. However, the internal resistance of the parallel connected batteries will also change. According to the parallel internal resistance formula, the total internal resistance of two parallel lithium batteries is equal to the ratio of the product of the internal resistance of the two batteries and the sum of their internal resistances. The parallel resistance will decrease with the increase of the number of parallel batteries. So, the efficiency of parallel charging of lithium batteries can be achieved on the basis that the current is less than the sum of the currents of n parallel lithium batteries.

When parallel connecting lithium batteries, attention should be paid to the consistency of the batteries, because parallel lithium batteries with poor consistency will experience charging failure or overcharging during the charging process, which will damage the battery structure and affect the life of the entire battery pack. Therefore, when selecting parallel batteries, it is important to avoid mixing lithium batteries of different brands, capacities, and levels of age. The inherent requirements for battery consistency are: voltage difference of lithium battery cells ≤ 10mV, internal resistance difference ≤ 5m Ω, and capacity difference ≤ 20mA.

In fact, after parallel connection of lithium batteries, there will be a charging protection chip to provide charging protection for the lithium batteries. Lithium battery manufacturers have fully considered the characteristics of the changes after parallel connection of lithium batteries when making parallel lithium batteries, and have also designed the current and selected the battery cells according to the above requirements. Therefore, users need to follow the instructions for parallel lithium batteries to charge them step by step, in order to avoid possible damage to the battery caused by incorrect charging.

The voltage of the batteries in series is equal to the total voltage of the batteries in series. Increasing the voltage, the bulbs are connected in series, and one switch can control all bulbs connected in series on one line

Connecting pools in series can increase output voltage. What are the characteristics of connecting light bulbs in series? The sum of the voltages of each bulb is the total voltage of the circuit

After the batteries are connected in series, the voltage is added up and the currents are equal, which increases the voltage; Parallel connection of batteries with constant voltage (provided that batteries with similar voltage can be connected in parallel, otherwise high voltage batteries will charge low voltage batteries, and if the difference is too large, there may be danger). The current is equal to the sum of each battery, which can often be considered as increasing the battery capacity and providing greater current.

The voltage increases while the capacity remains unchanged.

The difference between series and parallel connection of batteries:

Battery series connection:

It refers to the connection between the beginning and end of the battery. The positive pole of the first battery is connected to the negative pole of the second battery, the positive pole of the second battery is connected to the negative pole of the third battery, and so on;

The series voltage is equal to the sum of the battery voltages, and the current is equal to the current flowing through each battery;

Damage to one section of the battery pack can result in the entire battery pack being unusable or experiencing a decrease in voltage;

Series connection can increase the total voltage.

Parallel connection of batteries:

It refers to the connection between the beginning and end of the battery. All batteries have their positive poles connected and their negative poles connected.

The parallel voltage is equal to the voltage of a single battery, and the current is equal to the sum of the battery currents.

Although the endurance of the battery pack has been enhanced, the damage caused by short-circuit current is more severe;

Parallel connection can increase the total current.

1. When batteries are connected in parallel, the voltage is equal everywhere, that is, Ua=Ub=Uc=Uo; The current is the sum of the currents of each battery, i.e. Io=Ia+Ib+Ic. (Refer to Figure 1 for the parallel circuit of the battery)

Parallel connection of batteries is suitable for situations where the voltage remains constant but the current needs to be increased.

2. When batteries are connected in series, the current is equal everywhere, that is, Io=Ia=Ib=Ic; Voltage is the sum of the voltages of each battery, i.e. Uo=Ua+Ub+Uc. (Refer to Figure 2 for the series circuit of the battery)

The use of batteries in series is suitable for situations where the current remains constant but the voltage needs to be increased.

Whether in series or parallel, the output power of the battery pack increases.

Parallel connection: Several batteries, positive and positive, negative and negative, are connected side by side with the same voltage. As the capacity increases, the corresponding current also increases. Series connection: Several battery heads and tails are connected in series, that is, positive and negative. The negative of the first section is connected to the positive of the second section, and so on. The voltage increases while the capacity remains unchanged. That is to say, if connected in series, the electromotive force is the sum of the electromotive forces of two batteries. If connected in parallel, the voltage they provide to the appliance is as large as the electromotive force of only one battery. I hope my answer can help you! I am also learning this part of the knowledge, it is difficult,

When connected in series, the voltage is the sum of the voltages of the two batteries. When connected in parallel, the voltage is equal to the voltage of these two batteries

Series connection increases voltage, parallel connection increases capacity. For example, if you have two 1.5-volt, 2000mAh batteries connected in series, you will get a 3-volt, 2000mAh battery, and parallel connection will result in a 1.5-volt, 4000mAh battery.

1. When batteries are connected in parallel, the voltage is equal everywhere, that is, Ua=Ub=Uc=Uo; The current is the sum of the currents of each battery, i.e. Io=Ia+Ib+Ic. (Refer to Figure 1 for the parallel circuit of the battery)

Parallel connection of batteries is suitable for situations where the voltage remains constant but the current needs to be increased.

2. When batteries are connected in series, the current is equal everywhere, that is, Io=Ia=Ib=Ic; Voltage is the sum of the voltages of each battery, i.e. Uo=Ua+Ub+Uc. (Refer to Figure 2 for the series circuit of the battery)

The use of batteries in series is suitable for situations where the current remains constant but the voltage needs to be increased.

Whether in series or parallel, the output power of the battery pack increases.

1. Series connection means that the current remains constant and the voltage is added together; Parallel connection means that the voltage remains constant while the current is added together

2. Although the voltage has not changed, connecting two 12V batteries in series is to obtain a higher voltage to adapt to electrical appliances. A current of 10A is required for voltages above 100W. For example, an inverter with a design value of 12V input has extremely high requirements for switches and wires. Therefore, reducing the current is the main reason, and two batteries need to be connected in parallel. However, the allowed normal discharge current is doubled. If 24V is used, the current is only 5A. Therefore, many places adopt high-voltage electrical appliances (such as electric vehicles) based on this principle. But there are also some appliances that are originally 12V. When their power (current) is high, the electric motor, in order to improve the working time of the battery or the current of a single battery is not enough to drive, the battery is only 12V, and some electrical appliances have relatively high power.

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