Alkaline storage battery, and method for producing alkaline storage battery

Abstract

An alkaline storage battery includes a spiral electrode group with a positive plate and a negative plate spirally wound with a separator interposed therebetween. The separator includes a plurality of sulfone group-containing regions. The plurality of sulfone group-containing regions are separated from one another in a winding direction, and disposed to face the positive plate or the negative 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 and nickel-cadmium storage batteries have been 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, nonwoven fabrics made of polyolefin fibers with excellent alkali resistance are used. However, due to the hydrophilicity of polyolefin fibers with alkaline electrolytes Since the aspect is poor, it is necessary to perform a hydrophilization treatment to improve the hydrophilicity. Therefore, nonwoven fabrics made of polyolefin fibers are used as separators for alkaline storage batteries after being subjected to various hydrophilization treatments such as sulfonation treatment, fluorine gas tr...

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, if 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 sulfonate sufficiently into the inside of the fiber, so the separator having a sulfo group has low liquid retention, and poor cycle life characteristics or high-efficiency discharge characteristics (Patent Document 1)

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