1799, Italian physicist Volt immersed a zinc plate and a tinplate in salt water, and found that there was current flowing in the wire connecting the two metals. So he put many pieces of flannel or paper soaked in salt water between zinc and silver, and then folded them flat.

When you touch both ends with your hands, you will feel a strong current stimulus. In this way, Volt successfully made the world's first battery-"Volt reactor". This "volt stack" is actually a series battery pack. This became the power supply for early electrical experiments and telegrams.

Extended data:

Ordinary battery:

1 dry cell

Dry battery is also called zinc-manganese battery. The so-called dry battery is relative to the voltaic battery, and the so-called manganese zinc refers to its raw materials. For dry batteries made of other materials, such as silver oxide batteries and nickel-cadmium batteries.

The voltage of Zn-Mn battery is 15V. Dry batteries consume chemical raw materials to generate electricity. Its voltage is not high, and the continuous current it can generate cannot exceed 1 amp.

2. Lead storage battery

Because its internal resistance is extremely small, it can provide a large current. When it is used to power an automobile engine, the instantaneous current can reach more than 20 amperes. The battery stores electrical energy when charging and converts chemical energy into electrical energy when discharging.

3. Lithium battery

Lithium battery has the advantages of high voltage, large specific energy, long storage life (up to 10 year) and good high and low temperature performance, and can be used at -40 ~ 150℃. Disadvantages are high price and low security. In addition, voltage lag and safety problems also need to be improved. Vigorously develop power batteries, the emergence of new cathode materials, especially the development of lithium ferrous phosphate materials, is of great help to the development of lithium batteries.

References:

Baidu encyclopedia-battery