Adhesive tape for non-aqueous battery

Abstract

The present invention provides an adhesive tape for a non-aqueous battery that improves an insertion competence of an electrode in a battery case and can prevent a short-circuit between electrodes caused by a burr existing on an electrode plate by using the tape in the battery in which the non-aqueous electrolytic solution is to be sealed without causing a decrease in power of the battery. The adhesive tape for a non-aqueous battery contains: a substrate and a pressure-sensitive adhesive layer on at least one side of the substrate, in which the pressure-sensitive adhesive layer contains 90 wt % or more of a polyisobutylene rubber, and in which a content of a polyisobutylene rubber having a molecular weight of 800,000 to 2,200,000 is in the range of 15 to 50 wt % based on the entire pressure-sensitive adhesive layer, a content of a polyisobutylene rubber having a molecular weight of 10,000 to 700,000 is in the range of 35 to 70 wt % based on the entire pressure-sensitive adhesive layer, and a content of a component having a molecular weight of 10,000 or less is 5 wt % or less based on the entire pressure-sensitive adhesive layer.

Description

technical field [0001] The present invention relates to an adhesive tape used in the manufacture of a non-aqueous battery, in particular, an adhesive tape applied to a part of the non-aqueous battery where the electrolyte solution is immersed or which may come into contact with the electrolyte solution. Background technique [0002] In lithium-ion batteries and other batteries sealed with non-aqueous electrolytes, in order to improve the adaptability of the electrodes into the battery case, and to prevent short circuits between electrodes caused by burrs existing on the plates penetrating the separator, the core is fixed, Adhesive tapes are used for insulation of the electrode extraction port, terminal fixing, and insulating spacers. As such an adhesive tape, an adhesive tape using an acrylic adhesive layer or a natural rubber adhesive layer as an adhesive layer is often used. [0003] However, in recent years, in order to improve the safety of the battery, an adhesive tape...

AI Technical Summary

Problems solved by technology

[0003] However, in recent years, in order to improve the safety of the battery, an adhesive tape is also used near the electrode leads located inside the wound structure of the battery. In this case, since the inner part of the wound structure is subjected to high internal pressure, the adhesive layer Easily deformed, the adhesive (adhesive layer) exuded from the base material is easily in contact with the electrolyte

In addition, the vicinity of the lead wires is the most reactive part of the battery, so the binder reacts with the electrolyte in the electrolyte solution, deteriorating the electrolyte solution and deteriorating battery characteristics.

Specifically, when an adhesive tape having an acrylic adhesive layer is used in the manufacture of a battery, the crosslinking points in the acrylic adhesive layer and the Functional groups chemically react with the electrolyte in the electrolyte to cause battery deterioration. In the case of using a natural rubber-based adhesive layer, which contains impurities containing double bonds in the structure, if the impurities containing double bonds dissolve into the electrolyte In the middle, there will be problems causing battery deterioration

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