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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, I need to work hard! Wishing you success in your studies!
The main difference between parallel and series connection of batteries is in voltage and capacity. For example, for a lithium battery with a voltage of 3.7V and a capacity of 3000mAh, if there are two batteries in series, the model of the battery pack is 7.4V/3000mAh. If there are two batteries in parallel, the model becomes 3.7V/6000mAh. When connected in series, the voltage increases while the capacity remains unchanged, while when connected in parallel, the capacity increases while the voltage remains unchanged. But the batteries we often use are all connected in series and parallel, such as three series and four parallel, etc. I hope it can help you.
1. Dry batteries are widely used in daily life, and series and parallel connections are common methods.
2. Series connection: Connect the positive pole of a dry battery to the negative pole of the next battery, and then connect them in sequence. This is called series connection.
The advantage of series connection is that it doubles the voltage (V) of the power supply, which is generally used to drive appliances with higher rated voltage.
3. Parallel connection: The voltage of a typical battery is the rated voltage of the relevant electrical appliances, and parallel connection of batteries is used for energy supply. While ensuring a constant voltage, it can increase the current at the rated voltage and better drive the electrical appliances.
4. Summary: By utilizing the series parallel connection of batteries according to the different needs of different electrical appliances, unexpected results can be achieved.
If batteries are connected in parallel at the same voltage, it will increase the usage time. The purpose of connecting batteries in series is to increase the battery voltage to match the voltage of the electrical appliance. If the voltage is low, the electrical appliance cannot start
The difference between series and parallel connection of dry batteries:
1. When dry batteries are connected in series, because each dry battery has electromotive force and internal resistance, the advantages of connecting dry batteries in series are: they can provide higher voltage; The disadvantage is that its internal resistance is high, which affects the power and current it provides.
2. After parallel connection of dry batteries, because parallel connection can reduce the internal resistance of the battery pack, it can provide larger current and power; The disadvantage is that the voltage it provides is only equivalent to the voltage of a dry battery.
3. Hybrid connection of dry batteries: A battery pack that connects dry batteries in series or parallel is called a hybrid connection. This can solve the problem that cannot be solved by only series and parallel connections.
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.
The difference in appearance of the wiring is shown in the following figure:
The voltage of a series connected battery is the sum of the voltages of each sub battery, and the output power (i.e. the amount of electricity connected in series) is related to the weakest capacity of a single battery.
The voltage of a parallel battery is the maximum value of the voltage of each sub battery, and the output power is N times that of the weakest sub battery in the battery pack (N is the number of sub batteries).
Because the output power of both series and parallel battery packs is related to the weakest battery in the battery pack, it is required to select sub batteries with similar levels of age and performance in the battery pack. Otherwise, the high-performance (or new) sub batteries in the battery pack will have to do work on the weak sub batteries, reducing the overall efficiency of the battery pack and adversely affecting the lifespan of the best sub batteries.
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.
Batteries with the same voltage and capacity:
When batteries are connected in parallel, the voltage remains constant and the current is added together;
When batteries are connected in series, the voltage is added and the current remains unchanged.
Batteries of different capacities cannot be connected in parallel or series.

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