KR101077273B1 - Supporter for lead-acid battery - Google Patents

Abstract

The present invention relates to an active material support for a lead acid battery, wherein the active material support according to the present invention includes an ultrafine fiber having an average fineness of 0.5 to 10 μm, which is made from one or more polymers selected from the group consisting of polyolefins and polyesters, and a unit Microfiber sheets having a weight of 10 to 100 g / m 2.

The active material support of the present invention is not harmful to human body compared to the support of glass fiber, paper, or fiber fabric material, and can be easily applied to a lead acid battery due to its excellent active material fall prevention effect and workability, and excellent battery performance. Can be represented.

Lead Acid Battery, Support, Microfiber, Hydrophilic Resin

Description

Active Material Support for Lead Acid Battery {SUPPORTER FOR LEAD-ACID BATTERY}

1 is a schematic cross-sectional view of a lead acid battery including an active material support according to an embodiment of the present invention.

2 is a schematic cross-sectional view of a lead acid battery including an active material support according to another embodiment of the present invention.

3 is a schematic cross-sectional view of an active material support according to an embodiment of the present invention.

(Symbol description for main parts of drawing)

1: negative electrode plate 2: positive electrode plate

3: Separator 4: Active Material Support

5: ultrafine fiber sheet 6: general fiber sheet 7: adhesive layer

[Industrial use]

The present invention relates to an active material support for a lead acid battery, and more specifically, is not harmful to a human body and the environment, and has an excellent active material drop prevention effect and workability, and thus can be easily applied to a lead acid battery, resulting in excellent battery performance. It relates to a lead-acid battery active material support.

BACKGROUND ART [0002]

In general, a lead acid battery is composed of a positive electrode plate, a negative electrode plate, a separator, a support, an electrolyte and a precursor. Lead peroxide (PbO2) is coated on the positive electrode plate as an active material, and spongy lead (Pb) is coated on the negative electrode plate as an active material.

In addition, a non-conductive separator is positioned between the pole plates to prevent electrical short between the positive plate and the negative plate. The separator has a small pore in order to prevent electronic short circuit by the electrode active material, and the separator is made of a porous material having a high porosity in order to facilitate oxygen transfer, electrolyte distribution and diffusion.

On the other hand, the lead-acid battery is a phenomenon that the active material falling off in the process of using for a long time, the dropped active material acts as a foreign material in the electrolyte solution adversely affects the battery performance and battery life.

In order to solve this problem, conventionally, a method of preventing the dropping of the active material by attaching a glass fiber mat (Mat) to the separator as an active material support. However, the glass fiber mat is damaged during the assembly of the separator with a part of the glass fiber damages the structure of the separator, thereby causing an electronic short circuit between the electrode plates. In addition, because the glass fiber mat has a high hardness, it gives a physical impact to the electrode active material, thereby partially weakening the adhesive strength of the active material, which is harmful to the human body, and thus has a bad working environment.

In order to make up for the disadvantages of these fiberglass mats, a method of using paper or nonwoven sheets instead of fiberglass mats as a support has been proposed.

However, in the case of using paper as a support, there is a problem in that part of the paper is dissolved in the process of using the lead acid battery to shorten the battery life. In addition, the general nonwoven fabric sheet has a small contact area with the active material and the surface is slippery, so that the active material attached to the surface of the electrode is easily dropped and the battery life is still shortened.

In view of the above problems of the prior art, the present invention has an object to provide an active material support for a lead acid battery excellent in the active material fall prevention effect and workability.

In order to achieve the above object, the present invention

Microfiber sheet containing microfibers having an average fineness of 0.5 to 10 μm made from one or more polymers selected from the group consisting of polyolefins and polyesters and having a weight of 10 to 100 g / m 2 per unit area.

It provides an active material support for a lead acid battery comprising a.

In addition, the active material support according to the present invention

A general fiber sheet including general fibers having an average fineness of 11 to 40 µm prepared from one or more polymers selected from the group consisting of polyolefins and polyesters; And a hydrophilic compound impregnated in the general fiber sheet.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 3.

In the present invention, "microfiber" means filament fibers having an average fineness of 0.5 to 10 mu m, and "normal fiber" means filament fibers having an average fineness of 11 to 40 mu m.

1 is a cross-sectional schematic view of a lead acid battery including an active material support according to a preferred embodiment of the present invention, and includes a structure including a negative electrode plate 1, a positive electrode plate 2, a separator plate 3, and an active material support body 4. Have

The active material support 4 according to the present invention comprises a microfiber sheet.

The microfiber sheet is made of microfine fibers having an average fineness of 0.5 to 10 μm, and the microfine fibers are preferably made from one or more polymers selected from the group consisting of polyolefins and polyesters.

Specifically, the polyolefin is preferably selected from one or more selected from the group consisting of polyethylene and polypropylene, the polyester is selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate. desirable.

The average fineness of the ultrafine fibers is preferably 0.5 μm or more in order to facilitate movement of the electrolyte, and preferably 10 μm or less in order to prevent the active material from easily falling off.

In addition, the microfiber sheet preferably has a weight per unit area of 10 g / m 2 or more in order to prevent the active material from falling off, and in order to facilitate electrolyte distribution and diffusion, the weight per unit area is preferably 100 g / m 2 or less.

On the other hand, the active material support according to the present invention, as shown in Figure 3, can be used alone the microfiber sheet 5, the general fiber sheet 6 to improve the morphological stability of the microfiber sheet 5 Can be used in a more combined form.

It is preferable that the general fiber sheet is made of a general fiber having an average fineness of 11 to 40 μm, and the general fiber is preferably made from one or more polymers selected from the group consisting of polyolefins and polyesters.

At this time, the polyolefin and polyester are the same as in the microfiber sheet described above.

In addition, the general fiber sheet can be used that impregnated with a hydrophilic compound. As the hydrophilic compound, it is preferable to use one or more selected from the group consisting of a silicone-based binder, a vinyl alcohol-based binder, an acrylic-based binder, and a surfactant commonly used in the art. At this time, the type of the surfactant is not particularly limited, and conventional cationic, anionic, amphoteric and nonionic surfactants can be used.

The hydrophilic compound imparts hydrophilicity to the general fiber sheet, and impregnated 0.5 parts by weight or more with respect to 100 parts by weight of the general fiber sheet in order to improve stiffness, and breaks or breaks the general fiber sheet during the molding process. It is preferable to impregnate to 2 weight part or less in order to prevent that from becoming.

As a method of combining the microfiber sheet and the general fiber sheet, an ultrasonic bonding method or a hot melt method may be used, or an adhesive layer 7 may be added between the microfiber sheet and the general fiber sheet. Can be.

The adhesive layer 7 is preferably manufactured using one or more selected from the group consisting of an epoxy resin, a polyurethane resin, and a polyacrylic resin.

Hereinafter, a method for preparing an active material support according to the present invention will be described in detail.

(Manufacture of microfiber sheet)

One or more polymers selected from the group consisting of polyolefins and polyesters are melted with a continuous extruder and discharged filaments through a nozzle. The filaments are then stretched using a high pressure air stretching apparatus such that the spinning speed is between 8,000 and 12,000 m / min. At this time, by controlling the stretching ratio or by controlling the discharge amount to produce an ultrafine fiber having an average fineness of 0.5 to 10 ㎛. The microfibers thus prepared are laminated in a web form on a continuously moving metal net to prepare a microfiber sheet having a weight per unit area of 10 to 100 g / m 2 using a method such as thermal bonding.

(Production of General Fiber Sheets)

One or more polymers selected from the group consisting of polyolefins and polyesters are melted with a continuous extruder, and the discharge amount is controlled to spin the continuous filaments. Thereafter, the filament to be discharged is solidified with a cooling wind at 20 to 40 ° C., and stretched so as to have a spinning speed of 4,500 to 5,500 m / min using a high pressure air drawing device. At this time, by adjusting the stretching ratio to produce a general fiber having an average fineness of 11 to 40 ㎛. The general fibers thus prepared are laminated in a web form on a continuously moving metal net, and a general fiber sheet may be manufactured using a method such as thermal bonding.

Subsequently, the fiber sheet is impregnated with a hydrophilic compound. The method of impregnating a non-woven fabric sheet with a hydrophilic compound is not specifically limited, A dipping method, a foam coating method, etc. can be used, Among these, a dipping method is more preferable.

On the other hand, the present invention provides a lead acid battery comprising the active material support.

1 and 2 are cross-sectional schematic diagrams of a lead acid battery including an active material support according to a preferred embodiment of the present invention. That is, the active material support 4 according to the present invention can be used by attaching to the side of the positive electrode plate 2 side of the separator 3 as shown in FIG. 1, and on both sides of the separator 3 as shown in FIG. 2. Each can be attached and used.

Particularly, in the case of using a support having a structure in which a microfiber sheet and a general fiber sheet are combined as shown in FIGS. 2) or it is preferable to attach so as to be in contact with the negative electrode plate 1.

Hereinafter, preferred examples and comparative examples are presented to aid in understanding the present invention. However, the following examples are intended to illustrate the present invention without limiting it thereto.

[ Example ]

Example  One

(Microfiber sheet)

Polypropylene resin (PP) was used as a raw material. The polypropylene resin was melted in a continuous extruder at 240 ° C. to discharge the filament through the nozzle. The filaments were then drawn at a spinning speed of 9,000 m / min using a high pressure air drawing device so that the average fineness was 5 μm. Thereafter, the stretched microfine fibers were laminated on a continuously moving metal net in the form of a web to prepare a microfiber sheet having a weight per unit area of 20 g / m 2.

Example  2

(Microfiber sheet)

A microfiber nonwoven fabric sheet was prepared in the same manner as in Example 1.

(General fiber sheet)

Polyethylene terephthalate (PET) resin was used as a raw material. The PET resin was melted using a continuous extruder at a spinning temperature of 288 ° C., and then the discharge amount and the number of capillary pores were adjusted so that the average fineness of the fiber produced after stretching was 25 μm. Subsequently, the continuous filament discharged from the capillary was solidified with a cooling air at 25 ° C., and then stretched to have a spinning speed of 4,500 m / min using an air stretching device, thereby preparing a general fiber having an average fineness of 25 μm.

Thereafter, the stretched general fibers were laminated in the form of a web on a continuously moving metal net. The laminated normal fiber was heat-bonded at a temperature of 240 ° C. to prepare a general fiber sheet having a weight per unit area of 20 g / m 2.

Subsequently, 1 part by weight of a surfactant (compound name: Alkyl sulfosuccinic acid ester sodium salt, manufacturer: HUB chemical, trade name: Hubstat-200) was impregnated with 100 parts by weight of the general fiber sheet by dipping.

(Combination of microfiber sheet and general fiber sheet)

The ultrafine fiber sheet and the general fiber sheet prepared in the above manner were combined using an ultrasonic bonding method (used device: Dongwon ultrasonic machines, manufacturer: Dongwon Roll, model name: DWFM-1800).

[ Comparative example ]

Comparative example  One

A glass fiber mat having a weight per unit area of 45 g / m 2 (Amersil, Germany, product name: AGM [Absorbed glass mat]) was used as an active material support.

Comparative example  2

The same general fiber sheet as in Example 2 was used as the active material support.

[ Experimental Example ]

Sliding angle and workability were evaluated for the supports prepared in Examples and Comparative Examples as follows, and the results are shown in Table 1 below.

Experimental Example  1: slip angle

The electrode plate (anode plate) was placed on the active material support, and the angle at which slipping started was measured.

Experimental Example  2: workability

Sensory evaluation of workability was carried out. When skin irritation was felt when the active material supporter contacted the skin, it was evaluated as 'poor', and when there was no skin irritation, it was evaluated as 'good'.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Configuration Microfiber sheet Microfiber Sheet +
General fiber sheet Fiberglass General fiber sheet Slip angle (°) 48 50 40 20 Workability Good Good Bad Good

As shown in Table 1, the active material support according to Examples 1 and 2 is good workability, but has a larger slip angle than Comparative Examples 1 and 2. From this, it can be seen that the active material supports of Examples 1 and 2 are easily in contact with the positive electrode plate and have an excellent active material fall prevention effect.

As described above, the active material support according to the present invention is not harmful to the human body as compared to the support of the conventional glass fiber, paper, general fiber material by using the microfiber sheet, the active material fall prevention effect and workability is excellent Do.

Claims (8)

Microfiber sheet containing microfibers having an average fineness of 0.5 to 10 μm made from one or more polymers selected from the group consisting of polyolefins and polyesters and having a weight of 10 to 100 g / m 2 per unit area. An active material support for a lead acid battery comprising a. The method of claim 1, wherein the active material support A general fiber sheet including general fibers having an average fineness of 11 to 40 µm prepared from one or more polymers selected from the group consisting of polyolefins and polyesters; And Hydrophilic Compound Impregnated in the Plain Fiber Sheet Further comprising, The general fiber sheet is an active material support for lead-acid battery that is combined with the ultrafine fiber sheet. The method of claim 1, The polyolefin is one or more selected from the group consisting of polyethylene and polypropylene, The polyester is one or more selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate active material support for a lead-acid battery. 3. The method of claim 2, The hydrophilic compound is one or more selected from the group consisting of a silicone-based binder, a vinyl alcohol-based binder, an acrylic binder, a cationic surfactant, an anionic surfactant, an amphoteric surfactant and a nonionic surfactant. . 3. The method of claim 2, The impregnation amount of the hydrophilic resin is 0.5 to 2 parts by weight based on 100 parts by weight of the normal fiber sheet active material support for a lead acid battery. 3. The method of claim 2, The active material support further comprises an adhesive layer for laminating the microfiber sheet and the normal fiber sheet. The method of claim 6, The adhesive layer is an active material support for a lead acid battery that is prepared from one or more selected from the group consisting of an epoxy resin, a polyurethane resin and a polyacrylic resin. A lead acid battery comprising the active material support according to any one of claims 1 to 7.

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