Process for manufacturing secondary batteries

Abstract

The invention is preparing method of secondary battery, firstly preparing a positive electrode, a negative electrode and two separating films; the positive electrode is covering a positive material film on a aluminium sheet, the positive electrode possesses a naked aluminium area, the negative electrode is covering a negative material film on a copper sheet, the negative possesses a naked copper area, the positive electrode, separating film, negative film and another separating film are superposed and convoluted to a multilayer rolling , thereinto the positive electrode material film and the negative material film are superposed, the naked aluminium area and the naked copper area are on the top end and the bottom end of the multilayer rolling, then conductive electrodes are separately sealed to the positive electrode naked aluminium area and the negative electrode naked copper area, at last the multilayer rolling is encapsulated a shell, and electrolyte is injected; The discharging efficiency of the secondary battery produced in the method is best when big current is discharging.

Description

technical field [0001] The present invention relates to batteries, in particular to a method for manufacturing a secondary battery, which can produce a secondary battery with excellent high-current discharge characteristics. Background technique [0002] The traditional secondary battery has the so-called winding type, which is to stack a positive electrode, a separator, a negative electrode and another separator in sequence, and wind them to form a multi-layer roll. The end of the positive electrode is provided with a conductive The end of the negative electrode is also provided with a conductive electrode, the multi-layer roll is packaged in a casing, and an electrolyte is injected into the casing to complete a secondary battery. [0003] When the traditional secondary battery is used in high current discharge, its discharge efficiency is not good. Taking a battery with a capacity of 2.0 ampere hours (Ah) as an example, after actual testing, when the secondary battery is d...

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Problems solved by technology

[0003] When the traditional secondary battery is used in high current discharge, its discharge efficiency is not good. Taking a battery with a capacity of 2.0 ampere hours (Ah) as an example, after actual testing, when the secondary battery is discharged at 15C (30 amps), Its discharge efficiency is only about 50%, as shown in Figure 6, when the secondary battery is discharged at 20C (40 amps), its discharge efficiency even approaches zero, as shown in Figure 7, therefore, how to improve the secondary battery The discharge efficiency during high current discharge has become the subject of research and development in the industry.

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