Thin diaphragm battery and preparing method thereof

Abstract

The invention relates to a thin diaphragm battery. The battery comprises a positive electrode plate, a diaphragm and a negative electrode plate which are successively laminated. The positive electrode tab is led out from one end of the positive electrode plate. The negative electrode tab is led out from one end of the negative electrode plate. The positive electrode tab and the negative electrode tab are arranged on the same side of a battery body. The thin diaphragm battery also comprises a first outer packaging diaphragm arranged on the positive electrode plate side and a second outer packaging diaphragm arranged on the negative electrode plate side. The first and second outer packaging diaphragms are sealed peripherally for packaging the positive electrode plate, the diaphragm, the negative electrode plate and electrolyte of the battery. The positive electrode plate comprises a current collector layer and a positive electrode material layer with which the current collector layer is coated. On one side of the first outer package diaphragm, close to the positive electrode tab, extends outwards to form an extension sheet. One surface of the extension sheet, facing to the positive electrode tab, is coated with sealant. The positive electrode tab and the negative electrode tab are fixedly stuck on the extension sheet of the first outer packaging diaphragm. The thickness of the battery is 0.1-5.5mm. The thin diaphragm battery disclosed by the invention has the characteristics of being thin, good in conductivity, good in tightness, and the like and the electrode tabs are not easy to break.

Description

technical field [0001] The invention relates to a thin film battery and a preparation method thereof. Background technique [0002] At present, electronic products are usually developed in the direction of thinning, such as active radio frequency identification (RFID) tags, smart cards, etc., correspondingly requiring the development of electronic components and accessories to be thinner and lighter. Batteries used in these electronic products must have the characteristics of thin thickness, light weight, high energy density, low self-discharge rate, high safety performance, no pollution to the environment, and good sealing. The current polymer lithium battery can be made into various shapes, and its thickness can also be made into a smaller thickness. In existing light and thin lithium batteries, aluminum strips are usually directly welded to the current collector aluminum foil of the positive plate of the battery to form positive tabs, and nickel strips are directly welde...

AI Technical Summary

Problems solved by technology

However, there is a certain thickness of sealant on the tabs, so the thickness of the battery is limited by aluminum strips, nickel strips, sealants, etc., making it difficult for the battery to be ultra-thin

In addition, the existing light and thin lithium batteries also use the protruding part on the side of the metal current collector as the tab, but the bending performance of the aluminum foil is not good, so the tab is easy to break during the battery sealing process

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