Alkaline storage battery and production method of alkaline storage battery

Abstract

The present invention provides a separator for an alkaline storage battery and an alkaline storage battery which are excellent in capacity retention characteristics even though there are few regions having sulfo groups. An alkaline storage battery comprising a helical electrode group in which a positive electrode plate and a negative electrode plate are wound in a spiral shape through a separator, the separator has a plurality of regions having sulfo groups, and the plurality of regions having sulfo groups The regions are arranged to be separated from each other in the winding direction, and to face the positive electrode plate or the negative electrode plate.

Description

technical field [0001] The invention relates to an alkaline storage battery and a manufacturing method of the alkaline storage battery. Background technique [0002] Recently, high-power alkaline storage batteries such as nickel-metal hydride storage batteries or nickel-cadmium storage batteries are used as power sources for electric vehicles, hybrid vehicles, electric bicycles, electric tools, and the like. [0003] As separators used in alkaline storage batteries, for example, non-woven fabrics made of polyolefin-based fibers with excellent alkali resistance are used, but due to the hydrophilicity of polyolefin-based fibers with alkaline electrolytes, Aspects are poor, so it is necessary to implement hydrophilic treatment to improve hydrophilicity. Therefore, non-woven fabrics made of polyolefin fibers are used as separators for alkaline storage batteries after various hydrophilization treatments such as sulfonation treatment, fluorine treatment, corona discharge treatmen...

AI Technical Summary

Problems solved by technology

[0005] However, in the sulfonation treatment for introducing sulfonic groups, after immersing the separator in concentrated sulfuric acid, neutralization, washing with a large amount of water, and drying are performed, so the treatment is cumbersome and time-consuming.

Therefore, the production cost of the separator into which the sulfo group is introduced by sulfonation treatment etc. is high.

[0006] In addition, when the sulfonation treatment is performed, the carbon-carbon bond of the polyolefin fiber is cut, so the mechanical strength of the separator having the sulfo group tends to decrease.

[0007] Furthermore, even by sulfonation treatment, it is difficult to sufficiently sulfonate into the inside of the fiber, so a separator having a sulfo group has low liquid retention and poor cycle life characteristics or high-rate discharge characteristics (Patent Document 1)

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