Technique for making lithium battery pole ear

Abstract

The invention discloses a method for manufacturing a lithium cell electrode tab, which comprises the following steps: a, cutting a metal strip of an electrode tab substrate into sections; b, performing ultrasonic cleaning; c, drying; d, performing surface treatment on the metal strip in a treating fluid; e, rinsing the metal strip by using deionized water; f, drying; g, fixing a sealant with the metal strip by PET and a double faced adhesive tape to ensure that the dimension reaches requirements; h, hot pressing, i, cooling at room temperature; and j, cutting a side-layer material into a single electrode tab. Due to the addition of the pretreatment and the surface treatment of the electrode tab base material metal strip or the surface treatment of the electrode tab base material metal strip, oxides on the surface of the metal strip can be removed effectively, and the surface activity of the metal strip is enhanced, so that the binding strength between the metal surface and the sealant is improved, the capability for resisting electrolyte attack is strengthened, the sealing property of battery cells is improved, and the service life of the lithium cell is prolonged from 3 to 6 months to 3 years.

Description

technical field

[0001] The invention relates to a manufacturing process of lithium battery tabs. Background technique

[0002] Lithium batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5-2 times that of nickel-metal hydride batteries of the same weight, and it has a very low self-discharge rate; in addition, lithium batteries have almost no "memory effect" and no toxic substances, etc. The advantages are also an important reason for its wide application. The service life of lithium batteries is a common concern in the industry, and one of the reasons that affects the service life of lithium batteries is caused by the ear.

[0003] At present, the tabs of lithium batteries are made of aluminum strips, nickel strips, and copper strips directly hot-pressed with the sealant...