description:
Portable electronic products use batteries as a power source. With the rapid development of portable products, the amount of various batteries has increased, and many new batteries have been developed. In addition to the familiar alkaline batteries, rechargeable nickel-cadmium batteries, and nickel-metal hydride batteries, there are also lithium-ion batteries that have become mainstream in recent years. Here you will find information about lithium-ion batteries, including its characteristics, main parameters, application range, and finally provide a reference for the design of lithium-ion battery charging lines.
Battery characteristics
The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance. The electromotive force is equal to the work done by the non-electrostatic force (chemical force) of the battery when the positive charge is moved from the inside of the battery to the positive electrode. The electromotive force depends on the chemistry of the electrode material and is independent of the size of the battery. The total amount of charge that the battery can output is the capacity of the battery, usually in ampere-hours.
In a battery reaction, the electrical energy produced per kilogram of reactive material is called the theoretical specific energy of the battery. The specific energy refers to the energy stored per unit weight or unit volume, expressed in Wh/kg or Wh/L. Wh is the unit of energy, W is watt, h is hour; kg is kilogram (weight unit), and L is liter (volume unit). The actual specific energy of the battery is smaller than the theoretical specific energy. Because the reactants in the battery are not all in accordance with the battery reaction, and the internal resistance of the battery also causes a voltage drop. On the other hand, the larger the cross-sectional area of ​​the current flowing through the battery, the smaller the internal resistance. The most important feature of lithium-ion batteries is the high specific energy. Today's lithium-ion battery technology can achieve a specific energy of 80~120 wh/kg, while the traditional lead-acid battery has a specific energy of only 30~40 wh/kg, so the lithium-ion battery It can store higher energy in a smaller volume, helping to focus on thin, short mobile electronic devices and electric vehicle applications requiring high endurance.
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