JP3367528B2 - Method and apparatus for manufacturing zinc electrode for alkaline zinc storage battery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a zinc electrode plate of an alkaline zinc storage battery.

[0002]

2. Description of the Related Art As a conventional method for manufacturing a zinc electrode plate of a nickel-zinc storage battery, a sheet method using Teflon (trade name of polytetrafluoroethylene, the same applies hereinafter) as a binder as shown in FIG. 4 is mainly used. It was In this method, the thickness of zinc active material 10 mixed with a binder is regulated by two rolls 11 and the process is repeated to form a sheet. The zinc electrode plate 15 is obtained by pressing the rolls 13 from both sides and bonding them together. However, this sheet method has poor productivity, and it is said that a paste method with high productivity is desirable.

As a method of manufacturing a paste type electrode plate,
Conventionally, a coating method as shown in FIG. 5 has been used by using CMC or the like as a binder. That is, a current collector 4 having a through hole is continuously passed through a paste 16 composed of a zinc electrode active material, a binder such as CMC, and a solvent, and is pulled up from a slitter 17 so that both surfaces of the current collector are covered. The paste 16 is applied. However, in alkaline zinc storage batteries, especially zinc electrodes, binders such as CMC have the drawback of increasing the viscosity of the electrolyte and deteriorating the discharge characteristics.

Further, in the paste method, when the fibrous alkali-resistant resin is used as a binder, the fibrous alkali-resistant resin is not uniformly applied to the paste but is applied unevenly. There was a flaw.

In order to solve this drawback, a method has been proposed in which a paper holding a paste as shown in FIG. First, the paste holding paper 19 and the current collector 4 having a through hole portion are provided between the two rolls 18, and the paste 16 is further supplied between the paste holding paper 18 and the current collector 4 to make the current collector 4 Of the paste 16 is applied and formed on one surface and inside of the through hole, and then the paste 16 is similarly supplied between the rolls 20 between the paste holding paper 21 and the current collector 4, and the other surface of the current collector 4 is Then, the paste 16 is applied and formed. After that, the paste holding papers 19 and 21 on both sides are wound up to obtain a zinc electrode plate. However, even in the method of using this paste holding paper, the thickness of the paste varies,
There was a serious defect that the applied active material was easily peeled off.

[0006]

As described above, according to the conventional paste type manufacturing method of the zinc electrode plate for the alkaline zinc storage battery, the obtained battery has poor discharge performance, or the paste cannot be uniformly applied and peeled off. There is a drawback that it is easy to do. Therefore, the present invention provides a method for manufacturing a zinc electrode plate for an alkaline zinc storage battery and an apparatus therefor capable of forming a paste uniformly on both sides of a current collector by a simple process without peeling. It is an issue.

[0007]

To solve the above object, according to an aspect of the present invention, the fibers by a binder of zinc electrode with fiberized alkali resistance resin, using absorption pastes guide Solvent The present invention is characterized in that a paste using a modified alkali-resistant resin can be applied uniformly.

Namely, it was a Solvent addition to the alkali resistant resin fibrous as zinc negative electrode active material and a binder composed mainly of zinc oxide and metallic zinc paste, to sandwich the current collector having a hole using arranged two pastes guide to absorb solvent held in a manufacturing method and apparatus of the zinc electrode plate for an alkaline zinc storage battery so as to applying the paste from both sides of the current collector. The ratio of the binder in the paste used in the present invention is preferably 1 part by weight or more with respect to 100 parts by weight of the zinc negative electrode active material.

[0009]

[Acting] flowability of the paste using fiberized alkali resistant resin as a binder and zinc oxide as a main component and metallic zinc varies greatly depending on the amount of Solvent. That is, high fluidity greater the amount of Solvent, flowability less conversely decreases.

As shown in FIG. 1, this paste is arranged on both sides of a current collector 4 having a hole, and the paste 3 is held by a paste guide 2. At this time, since the paste guide 2 absorbs Solvent, paste 3a of the surface in contact with the paste guide 2 is absorbed Solvent significantly lose fluidity.

The paste 3a having lost its fluidity is applied to the current collector 4 having a through hole. At this time, the paste 3 in the vicinity of the current collector without being absorbed Solvent paste guide 2 holds the fluidity. When the thickness of the paste 3 that retains the fluidity is regulated by the roll 1, the pastes 3 on both sides come into contact with each other through the through holes 5 of the current collector 4.

At this time, the fibrous alkali-resistant resin 6 placed in the paste 3 enters each other through the through holes 5 of the current collector 4 as shown in FIG. 2, and both sides of the current applied to the current collector 4 are activated. The substance is entangled and can be held.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. 3 or FIG. 1 of the accompanying drawings.

[0014] alkali-resistant resin which is fiberized in an active material consisting of metallic zinc and zinc oxide mixed with Teflon as a binder is kneaded into fibers using ethanol as Solvent.

[0015] At this time, Solvent can be an organic solvent such as alcohol Teflon and familiar good besides ethanol. Further, even if a fiberized polypropylene fiber or the like is used instead of polytetrafluoroethylene such as Teflon, this method can be applied.

[0016] The paste 3, as shown in FIG. 3, placed on each separately held absorption of Solvent are two possible paste guide 2 on the roll 1 of 2 having a thickness adjustment action.

The paste guide 2 is formed into a belt shape for continuous use. The material used is cotton, but any material that does not dissolve in the solvent and can absorb the solvent may be used.

When the roll 1 is rotated as shown in FIG. 1, the paste 3 which has lost its fluidity by the mechanism described above is supplied to the current collector 4 and applied. Furthermore, this time the roll 1 will regulate the thickness, since the paste 3 has an effect to suppress with paste guide 2, excess Solvent is squeezed out, roll 1
Is discharged along with. After that, the heater 7 is slightly dried so that the paste guide 2 and the paste 3 which has largely lost the fluidity are easily separated. The paste guide 2 is completely dried, and the adhering active material is scraped off by the brush 8 and continuously used.

The current collector 4 on which the paste 3 has been applied is
Further, if necessary, the thickness is adjusted after passing through a complete drying device using the heater 9 and used as a zinc electrode plate for an alkaline zinc storage battery.

[0020]

As described above, by using the manufacturing method of the present invention, the outer layer portion of the paste using the fibrous alkali resistant resin as the active material binder applied to the current collector loses its fluidity. In addition, since the inside of the paste has fluidity and enters the through holes of the current collector, it is possible to apply the paste uniformly while simplifying the manufacturing process, and further peeling of the active material occurs. It is possible to produce a zinc electrode plate for an alkaline zinc storage battery that does not have a battery.

[Brief description of drawings]

FIG. 1 is a view showing a positional relationship between a fluidized paste and a fluidized paste in which a paste guide has absorbed a dispersion solvent in a double-sided coating method of the present invention.

FIG. 2 is a diagram showing a positional relationship of fiberized alkali resistant resin in a paste applied to a current collector.

FIG. 3 is a diagram showing an outline of a zinc electrode plate manufacturing process for an alkaline zinc storage battery according to an example.

FIG. 4 is a view showing a conventional method for manufacturing a zinc electrode plate for a sheet type alkaline zinc storage battery.

FIG. 5 is a diagram showing a conventional method for producing a zinc electrode plate for an alkaline zinc storage battery using CMC or the like as an active material binder.

FIG. 6 is a diagram showing a method for manufacturing a zinc electrode plate for an alkaline zinc storage battery using a conventional single-sided coating method.

[Explanation of symbols]

1 roll 2 Paste guide 3,3a Zinc electrode active material paste 4 Current collector with through hole 5 through holes 6 Alkali resistant resin 7,9 heater 8 Active material scraping brush 10 Zinc active material 11, 13, 18, 20 rolls 12 Sheet-shaped zinc active material 14 Current collector 15 Sheet-shaped zinc electrode plate 16 paste 17 slitters Paper that holds the paste

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeo Ishii 6-6 Josaimachi, Takatsuki-shi, Osaka, Yuasa Corporation (56) References JP-A-3-64859 (JP, A) JP-A-2- 267862 (JP, A) JP-A-2-244556 (JP, A) JP-A 64-77872 (JP, A) JP-A 59-169066 (JP, A) JP-B 60-7347 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01M 4/00-4/04 H01M 4/14-4/34

Claims (2)

(57) [Claims] 1. A method for producing a zinc electrode plate for an alkaline zinc storage battery, comprising 100 parts by weight of a zinc negative electrode active material containing zinc oxide and metallic zinc as main components and 1 part by weight or more of a fibrous alkali resistant resin as a binder. the solvent was added a paste when formed by coating to a current collector having through holes to hold the paste by the paste guide to absorb two solvent arranged across the current collector, wherein the paste A method for producing a zinc electrode plate for an alkaline zinc storage battery, characterized by applying from both sides of a current collector. 2. A manufacturing apparatus zinc electrode plate for an alkaline zinc storage battery, and two pastes guide to absorb Solvent,
And a mechanism for supplying paste and current collector including a Solvent to between the paste guide, alkaline zinc, characterized in that as the paste can be coated on both surfaces of the current collector by sandwiching the paste guide Equipment for manufacturing zinc electrode plates for storage batteries.