Lithium iron phosphate aluminum shell 8 ampere-hour column battery and producing technique thereof

Abstract

The invention relates to an eight ampere-hour column battery with an iron phosphate lithium aluminum shell and the processing technology, belonging to lithium iron power battery field. The invention has an external diameter of 35.0mm plus or minus 0.1mm and a height of 110.0mm plus or minus 0.5mm, omprising a casing, an anode flake, a cathode flake, an electrolyte and a diaphragm; wherein, the anode flake and the cathode flake respectively comprise an anode current collector and a cathode current collector, as well as an anode sizing agent and a cathode sizing agent coated on the anode current collector and the cathode current collector. The casing is an aluminum shell; the anode material uses the iron phosphate lithium; the anode current collector uses aluminum foil; the conductive agent uses one of or the mixture of the superconducting carbon black and the conductive graphite; and the anode material binder uses the polyvinylidene fluorine; the cathode material uses the natural graphite or the artificial graphite; the cathode current collector uses copper foil; the conductive agent uses one of or the mixture of the superconducting carbon black and the conductive graphite; and the cathode material binder uses the polyvinylidene fluorine or the sodium carboxymethylcellulose and the styrene butadiene rubber; the anode flake, the cathode flake and the diaphragm are winded into a cylindrical volume core through the multilayer stack-up. The invention has the advantages of large capacity and high discharge rate.

Description

technical field [0001] The invention belongs to the field of lithium-ion power batteries, and belongs to a lithium-ion secondary battery that provides driving energy for small and medium electric tools, household electronic appliances, electric bicycles, electric motorcycles and electric vehicles; in particular, it relates to a lithium iron phosphate lithium aluminum battery Shell 8 Ah cylindrical battery (35110) and its manufacturing process. Background technique [0002] With the development of the economy and the improvement of people's living standards, people's demand for high-energy density and large-capacity batteries is becoming more and more intense. Lithium-ion batteries have the best performance among the several batteries that can be used for power tools. Lithium-ion batteries are different from ordinary acid batteries in that they have the characteristics of high voltage, high specific energy, long cycle life, and low self-discharge rate. However, for lithium-i...

AI Technical Summary

Problems solved by technology

It is expected that spinel LiMn 2 o 4 Can rely on its cheap and relatively LiCoO 2 The advantages of safety play a role in large-capacity batteries, but a good solution has not been found for its shortcomings of low capacity and poor high-temperature cycle performance, and it has not been widely promoted in actual batteries.

[0005] Although lithium iron phosphate power battery has a series of incomparable advantages of other materials, it also has some shortcomings, mainly in: 1. Pure LiFePO 4 Poor electrical conductivity and lithium ion diffusion performance, resulting in poor battery high current discharge performance; 2. LiFePO 4 The bulk density and tap density are relatively low, and it is not easy to process, which leads to difficulty in the coating of positive electrode slurry in the production process, and the battery capacity is low