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Temperature and environmental temperature are important factors affecting the resistance. For lithium-ion batteries, the temperature affects the activity of electrochemical materials, which directly determines the speed of electrochemical reaction and the speed of ion movement.

Because the positive plate of the electric lithium-ion battery cell is made of aluminum strip, tin can not be directly welded, so it is necessary to add nickel strip. Ultrasonic metal spot welding method is usually used: high frequency oscillation occurs by ultrasonic, which makes the friction between two metal plates heated locally, resulting in fusion connection. Frequency: 20K ~ 35kHz, time: about 0.3 seconds. Pay attention to the selection of suitable welding equipment for metal ultrasonic welder.

Do not use lithium batteries (especially notebook lithium batteries) for a long time when the equipment is powered externally. Even if your laptop has good heat dissipation, a long-term 100% of the electricity is equal to the murder of lithium batteries.

In 1799, Alessandro Volta, an Italian physicist, invented the first battery (vlotaic pile). He made the battery from zinc (anode) and copper (cathode) and paper (electrolyte) soaked in brine to prove that electricity can be manufactured artificially.