What is a LiFePo4 battery
LiFePo4 battery refers to a lithium-ion battery using lithium iron phosphate as a positive electrode material. This type of battery is characterized by no precious metal elements. In actual use, lithium iron phosphate battery has high-temperature resistance, strong stability, high cycle times, and price. Cheap and other advantages.
The Structure of LiFePo4 battery
As shown in the figure below, the left side is LiFePo4 with an olivine structure, and the right side is a carbon (graphite), which is separated by a special composite membrane. The positive electrode on the left is connected to the aluminum foil, the negative electrode on the right is connected to the copper foil, the electrolyte of the battery is between the upper and lower ends of the battery, and the battery is sealed and sealed by a metal casing.
1. Composite diaphragm
The separator is one of the key inner layers of the battery cell, and its main functions are: to separate the positive and negative electrodes of the battery to prevent short-circuiting between the two poles; it has the function of passing ions; the battery is overheated, and the current conduction in the battery is blocked by the closed-cell function.
The electrolyte is an important part of the battery, which plays the role of conducting ions between the positive and negative electrodes of the battery, and is a bridge connecting the positive and negative materials.
3. Positive pole
The LiFePo4 battery is an olivine-type structure, LiFePo4 is used as the positive electrode material, and the conductive electrode fluid uses an electrolytic aluminum foil with a thickness of 10--20 microns.
4. Negative pole
The negative electrode of the LiFePo4 battery is graphite, or carbon with a similar graphite structure, and the conductive current collector uses an electrolytic copper foil with a thickness of 7-15 microns.
5. Battery metal casing
The metal shell of the battery is divided into a steel shell, aluminum shell, nickel-plated iron shell), aluminum-plastic film, etc., as well as the cap of the battery, which is also the positive and negative terminals of the battery.
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