1746, Mei Sen Brock of Leiden University in the Netherlands invented the "Leiden bottle" for collecting charges. He wants to find a way to save electricity, because he sees that the electricity he collects can easily disappear in the air.

One day, he hung a bucket in the air, connected the motor, led it out of the bucket with a copper wire and immersed it in a glass bottle filled with water. He asked an assistant to hold a glass bottle in one hand, while Mei Sen Brock shook the motor vigorously.

At this time, his assistant accidentally hit the other person's hand with a barrel. He suddenly felt a strong electric shock and cried. Mei Sen Brock then switched places with his assistant and asked him to shake the motor. He held the water bottle in one hand and touched the bucket in the other.

1780, when Italian anatomist Gavagni dissected a frog, he accidentally touched the frog's thigh with metal instruments with different hands, and the muscles of the frog's leg twitched immediately, as if stimulated by electric current, but if only one metal instrument was used to touch the frog, there would be no such reaction. Galvani believes that this phenomenon is caused by a kind of electricity generated in animals, which he calls "bioelectricity". Then the charging treasure was invented.

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Working principle and composition

1, principle

The principle of mobile power supply is simple. When an external power supply can be found, the built-in battery is precharged, that is, electric energy is input and stored in the form of chemical energy. When necessary, the battery will provide energy and generate electricity, the voltage converter (DC-DC converter) will reach the required voltage, and the output terminal (usually USB interface) will supply power to the required equipment for charging or other purposes.

2. Basic ingredients

Mobile power supply has three basic functions, including energy storage, charging and power supply. Other functions such as safety protection, battery state detection and display are added to meet the needs of different designs, use and convenient operation.

3. Energy storage (battery)

In order to supply power to other devices without external power supply, mobile power supply needs batteries to store energy. Most mobile power sources use lithium-ion batteries (Li-ion) or lithium-ion polymer batteries (Li-PO), a few mobile power sources use nickel-hydrogen batteries (Ni-MH), and some early mobile power sources use primary batteries.

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