A phosphate Fe, lithium and aluminum shell column battery and its making technology

Abstract

The invention relates to an iron phosphate lithium aluminum shell cylindrical battery and the manufacture process thereof, and belongs to the field of lithium ion power batteries. The invention comprises a shell, a positive plate, a negative plate, electrolyte and a septum. The positive plate and the negative plate respectively comprise positive and negative fluid collecting bodies and positive and negative sizing agent, and the positive and negative sizing agent are coated on the positive and the negative fluid collecting bodies. The shell is an aluminum shell. Positive materials adopt iron phosphate lithium; the positive fluid collecting body adopts aluminum foil; electric conduction agent adopts one or two mixtures of superconductive carbon soot and electric conduction graphite; positive material caking agent selects polyvinylidene fluoride. Negative materials adopt native graphite or artificial graphite; the negative fluid collecting body adopts copper foil; the electric conduction agent selects one or two mixtures of the superconductive carbon soot and the electric conduction graphite; negative material caking agent selects the polyvinylidene fluoride or sodium carboxymethyl cellulose and perbunan. The positive plate, the negative plate and the septum are made into a columniform winding core through the winding of multilayer cascades. The invention not only has big capacity, but also can discharge in a great multiplying power.

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 aluminum shell Cylindrical battery 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-ion batteries that have been u...

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