Manufacturing equipment and manufacturing method for electrode of power type lithium ion battery

Abstract

The invention discloses manufacturing equipment and a manufacturing method for an electrode of a power type lithium ion battery. The manufacturing equipment comprises a vibration disk, a foam metal die, an electrode solid-state filler powder box and foam metal, wherein the foam metal die is arranged on the vibrating disk; the electrode solid-state filler powder box is arranged above the foam metal die; and the foam metal is arranged in the foam metal die. The foam metal with the characteristics of high electric conductivity, high thermal conductivity, large specific surface area, uniform and small through holes and the like is adopted as a current collector, and a skeleton structure of the foam metal is inserted into powdery active substances for pressurization to obtain an electrode plate with strong binding force, so that the active substances difficultly fall, the electric conductivity of the active substances of the electrode is effectively improved, internal resistance is lowered, heat produced by the battery is reduced, radiation is facilitated, and the service life of the battery is prolonged; and in addition, a solid-state active substance is used for directly filling the foam metal without an aqueous solution or a non-aqueous solvent, so that the obtained electrode plate is not required to be baked to remove the solvent, the manufacture period of the battery is shortened, energy consumption is reduced, and production cost is saved.

Description

technical field [0001] The invention relates to an electrode manufacturing equipment and a manufacturing method for a power type lithium ion battery, and belongs to the modification technology of the manufacturing equipment and a manufacturing method for an electrode for a power type lithium ion battery. Background technique [0002] The shortage of oil and the environmental pollution caused by the burning of fossil energy have made countries around the world increase their efforts to promote the development and industrialization of new energy vehicles such as electric vehicles. Battery-driven electric vehicles and hybrid vehicles can use nuclear power, wind power and photovoltaic power, and can also use conventional power to charge at night. This has great significance for reducing the excessive dependence of automobiles on fossil fuels and balancing electricity demand. The power battery technology represented by lithium-ion batteries has attracted the attention of researc...

AI Technical Summary

Problems solved by technology

However, for power lithium-ion batteries with higher power requirements and longer life requirements, if the above-mentioned production method of manufacturing pole pieces is still used, the following problems will occur: (1) Due to the lack of space between the foil-shaped current collector and the active material of the battery Three-dimensional mechanical fixation, such a battery will soon deteriorate the electrical contact between the active material on the plate and between the active material and the metal current collector during use, and even cause the active material to fall off, resulting in a loss of battery capacity. Reduced service life

(2) Using coating technology, a large amount of non-electrochemical active ingredients such as conductive agents, binders, and solvents need to be added to the active material, which reduces the proportion of active materials in the electrode sheet per unit volume. Increased internal resistance is not conducive to the performance of battery materials and the capacity and power performance of the entire battery

The increase in internal resistance of the battery also directly affects the calorific value of the battery during charging and discharging, and is not good for heat dissipation, resulting in excessive battery temperature and unbalanced internal temperature of the battery, which can cause some batteries in the power battery stack to fail prematurely, resulting in battery stack failure. Dramatic increase in maintenance and replacement costs for failed batteries

(3) Due to the existence of water or non-aqueous solvents in the binder and the solvent for mixing paste, they must be removed by high-temperature baking process. With the development trend of nanometerization and porosity of positive and negative active materials of batteries, it is becoming more and more clear. Solvent removal will become increasingly difficult

Obviously, this invention still cannot solve the three problems faced by the above-mentioned wet process manufacturing power lithium-ion battery pole pieces

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