Manufacturing method of solid-state battery

Abstract

The invention discloses a manufacturing method of a solid-state battery. The solid-state battery comprises a battery unit, wherein the battery unit comprises a positive electrode sheet, a solid-stateelectrolyte layer and a negative electrode sheet, and the positive electrode sheet comprises a first current collection layer and positive electrode material layers which are combined with the two side faces of the first current collection layer respectively. The manufacturing method of the solid-state battery comprises the steps of firstly, laminating the positive electrode sheet, the solid-stateelectrolyte layer and the negative electrode sheet of the battery unit in sequence, then locating the battery unit on an additional circuit board in a pressure bin, and finally, providing temperaturecontrol of 20-200 DEG C and medium pressure control of 5-100,000PSI. In this way, all joint faces of the positive electrode sheet, the solid-state electrolyte layer and the negative electrode sheet are softened to form highly-dense joint.

Description

technical field [0001] The invention relates to a manufacturing method of a solid-state battery, in particular to a manufacturing method of a solid-state battery capable of making the solid itself of the solid-state battery or between solids and solids interfaceless. Background technique [0002] Generally, the manufacturing process of electrode sheets in lithium batteries can be roughly divided into two methods: stacking and winding. Both methods are made by sandwiching separator paper between the positive electrode and negative electrode, and then stacking or winding repeatedly. After entering the case, inject electrolyte, and finally seal with steel balls to form a lithium battery. However, when the battery core is in the state of charge and discharge, short circuit or high temperature environment, the temperature of the battery liquid rises to a high temperature of about 75~80°C, because the separator paper and the electrolyte are not resistant to high and low temperatur...

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to provide a solid-state battery manufacturing method that uses the pressure softening properties of materials to apply temperature and pressure to the battery cells in the pressure chamber, so that the layers of the battery cells are bonded together, which can solve the problem of existing solid-state batteries. The bonding effect of the battery is uneven, resulting in high interface impedance and low energy density. However, it can effectively form a high-density bonding layer to eliminate void areas, reduce contact interface impedance, increase energy density, and perform high-level bonding. combine

[0006] An object of the present invention is to provide a solid-state battery manufacturing method in which the layers of the battery cell are pressurized from the outer periphery of the battery cell with omnidirectional pressure, so that the joint surfaces of each layer are softened and then joined, which can solve the problem of existing problems. The double-sided pressure equalization method will cause the battery material to be extruded from the surrounding sides, so that the battery material can still be maintained in a fixed space after softening, so as to ensure its performance.

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