JPH07335191A - Complex retainer for sealed lead acid battery and manufacture of retainer - Google Patents

Abstract

PURPOSE:To provide a complex retainer for a sealed lead acid battery and a manufacturing method for retainers, with which an excellent anti- shortcircuiting performance is obtained and also stacker assembling is possible. CONSTITUTION:A bonding agent 2 having a viscosity of 100-1000cps and a glass transition point of 30 deg.C is applied to at least a couple of opposing edges of an active material intrusion preventive sheet 1 prepared by a wet sheet- making process. The sheet 1 and a retainer 3 for sealed lead acid battery chiefly containing glass fibers are laid one over another, and the bonding agent 2 is allowed to permeate the two, which are thus joined together to form a complex retainer 4 for the sealed lead acid battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite retainer for a sealed lead-acid battery, which can be assembled in a stacker, and a method for manufacturing the same.

[0002]

2. Description of the Related Art A sealed lead-acid battery is constructed by interposing a retainer impregnated with dilute sulfuric acid, which is an electrolytic solution, between a positive electrode plate containing lead dioxide as an active material and a negative electrode plate containing lead as an active material and closely contacting each other. It is a lead acid battery. The reason for using the retainer in close contact between both electrode plates is to supply the dilute sulfuric acid held by the electrode plate to cause a discharge reaction, to absorb water generated by the discharge reaction, and in the charging reaction. It is to supply the retained water to the electrode plate to cause a charging reaction and to absorb the dilute sulfuric acid generated by the charging reaction. Further, in order to seal the battery, the retainer has a function of guiding oxygen gas generated in the anode plate at the end of charging to the cathode plate. Furthermore, the retainer must be interposed between the positive and negative electrode plates as a separator function to maintain ionic conductivity and electrical insulation between them.

[0003]

On the other hand, in order to increase the capacity of a sealed lead acid battery and improve the high rate discharge characteristics, the electrode plates are thinned to increase the number of electrode plates per battery cell, and the electrode plate spacing is also increased. It is necessary to narrow In this case, the retainer also needs to be thin. However, when the retainer is made thin, a short circuit easily occurs due to the unevenness of the electrode plate biting into the retainer, the active material digging into the retainer, and the like. In order to increase the capacity of the sealed lead storage battery and improve the high rate discharge characteristics, it is necessary that the retainer be thin and have short-circuit resistance. Moreover, in order to reduce the price of sealed lead-acid batteries, it is essential to improve the productivity of lead-acid batteries, and the stacker assembly method that has been introduced for the assembly of liquid lead-acid batteries for automobiles has been adopted for the assembly of sealed lead-acid batteries. When applied to, the productivity of sealed lead-acid batteries can be improved. However, the conventional sealed lead-acid battery retainer has a low rigidity and a large slip resistance between the retainers, so that the stacker cannot be assembled.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a composite retainer for a sealed lead-acid battery, which solves the above-mentioned conventional problems. At least one surface of the retainer for a sealed lead-acid battery, which is mainly composed of glass fiber, An active material intrusion prevention sheet made of a wet papermaking sheet is provided on the entire surface, and at least one pair of opposite sides of the outer periphery thereof has a glass transition point (Tg) of 30 ° C.
It is characterized by being bonded with the above adhesive. The present invention also provides a method for producing the composite retainer for a sealed lead-acid battery, wherein the viscosity is 100 to 100% on at least one pair of opposite sides of the outer periphery of the active material intrusion prevention sheet produced by a wet papermaking method. An adhesive having 1000 cps and a Tg of 30 ° C. or higher is applied, and the active material intrusion prevention sheet and a retainer for a sealed lead acid battery mainly made of glass fiber are overlapped with each other to allow the adhesive to soak into the both, and the both are joined. And

[0005]

Since the composite retainer for a sealed lead-acid battery of the present invention has the wet papermaking sheet layer having the function of preventing the intrusion of the active material, the end of the electrode plate is retained at the end of the electrode plate when the electrode plate group is pressed when being incorporated into the battery. It is possible to prevent a short circuit due to strong pressure on the electrode and a short circuit due to the convex portion of the electrode plate pressing the retainer strongly when the surface smoothness of the electrode plate is poor. Also,
When the battery is used after it has been installed in the battery, a short circuit occurs due to repeated expansion and contraction of the electrode plate during repeated charging and discharging, and it also occurs when fine lead powder gets caught in the retainer during repeated charging and discharging. It is also possible to prevent short circuits that occur.

On the other hand, the rigidity of the retainer for a sealed lead acid battery, which is necessary to make the sealed lead acid battery into a stacker assembly system, is T as an adhesive agent for sticking the active material intrusion prevention sheet.
It is ensured by using an acrylic or styrene adhesive having a g of 30 ° C. or higher, and further by making at least two opposite sides of the end portion of the composite retainer for a sealed lead-acid battery that bond the both. Further, the reduction of the slip resistance between the retainers is realized by keeping the surface of the active material intrusion prevention sheet smooth and reducing the friction resistance. In this way, by adopting the stacker assembly method of the sealed lead acid battery, the productivity of the sealed lead acid battery is dramatically improved as compared with the conventional one.

[0007]

EXAMPLE Next, an example of the composite retainer for a sealed lead-acid battery of the present invention will be described. An average fiber diameter of 0.3 to 5 μm is provided as a retainer for a sealed lead acid battery mainly composed of glass fiber used in the composite retainer for a sealed lead acid battery of the present invention.
Glass fiber of 0.5 to 2 μm is preferably used. When glass fibers having an average fiber diameter of more than 5 μm are mainly used, the electrolyte retaining ability, which is one of the retainer functions, becomes low, which is not preferable. Further, the average fiber diameter is 0.
It is not preferable to mainly use glass fibers of less than 3 μm, because the cost of the retainer becomes extremely high. Glass fiber
Not only one made of only one kind of glass fibers having an average fiber diameter, but two or more kinds of glass fibers having an average fiber diameter within the above range of glass fiber diameters may be made in combination. When glass fibers having an average fiber diameter of 0.3 to 5 μm are mainly used, glass fibers having an average fiber diameter of 5 to 20 μm can be blended in a range of 20 wt% or less.
The glass composition of the glass fiber has acid resistance, and alkali-containing glass or the like is preferable.

When a retainer for a sealed lead-acid battery is constructed only with glass fibers to cope with a thinner retainer, when the workability at the time of manufacturing the retainer is poor due to insufficient strength, it becomes a binder component for reinforcement. Fiber, synthetic pulp,
It is possible to mix resin emulsion, natural pulp and the like in the range of 20 wt% or less. On the other hand, as a characteristic of the sealed lead-acid battery, when deep charging and discharging are repeated, a so-called stratification phenomenon may occur in which a difference in specific gravity of the electrolyte solution occurs between the upper and lower sides of the battery. As a means to avoid this stratification phenomenon,
For retainer for sealed lead-acid battery mainly made of glass fiber,
As an inorganic powder having a specific surface area of 100 m ² / g or more, synthetic silica powder or the like can be blended in a range of 50 wt% or less.

The active material intrusion prevention sheet used for the composite retainer for a sealed lead acid battery of the present invention is capable of preventing invasion of lead powder, which is an active material of a lead acid battery, and surface irregularities generated during the production of a lead acid battery electrode plate, It does not break even if it is hit by a mass of active material, its electrical resistance is sufficiently low, and its electrolyte retention is high (large porosity). The active material intrusion prevention sheet capable of ensuring the above performance is most suitable as a liquid lead acid battery separator produced by a normal wet papermaking method.

As the material used for the active material invasion prevention sheet, a fine material having excellent acid resistance and oxidation resistance and containing no impurities such as heavy metals is used. Generally, it is composed of inorganic powder, glass fiber, and binder components such as synthetic pulp, synthetic fiber, synthetic resin, and natural pulp. As the inorganic powder, fine powder such as synthetic silica powder and diatomaceous earth having acid resistance and containing no impurities such as heavy metals is used. As a glass fiber, the average fiber diameter is 0.2 to 3
It is necessary to use an alkali-containing glass or the like having an acid resistance in the range of 0 μm. As synthetic pulp,
Use those with acid resistance such as polyethylene and polypropylene. As the synthetic fibers, those having acid resistance and oxidation resistance such as polyester fibers, acrylic fibers, polypropylene fibers, etc., and composite fibers mainly composed of these materials may be used. The synthetic resin is used for the purpose of fixing the fiber material or the powder material and supplementing the strength, and an acrylic emulsion or the like is preferable. As the natural pulp, plant fibers such as kraft pulp, linter pulp, and bast fiber that do not contain impurities such as heavy metals are used. When used, a beater such as a beater is used to break the fiber into an arbitrary fiber diameter and fiber length.

In order to prevent the intrusion of lead powder, which is the main purpose of this active material permeation preventive sheet, it is advantageous that the pore diameter is small, and the average pore diameter must be 10 μm or less. However, when the average pore diameter is small and less than 0.1 μm, the electric resistance increases and the battery discharge characteristics deteriorate, so that it is suitable as an active material intrusion prevention sheet used in the composite retainer for a sealed lead acid battery of the present invention. Absent.

On the other hand, the thickness of the active material penetration preventing sheet is 0.
It is necessary to set it to 05 to 1.0 mm, preferably 0.2 to 0.7 mm. This is because when the thickness exceeds 1.0 mm, the electric resistance becomes high and the battery discharge characteristics deteriorate, and when the thickness is less than 0.05 mm, the electric resistance becomes low, but the permeation blocking performance of the active material is reduced. Is worse,
When the thickness exceeds 0.7 mm, the effect of preventing a short circuit between the positive electrode and the negative electrode is high, but in a sealed lead-acid battery with a narrow gap between the so-called short pitches, the composite retainer layer is thin. However, when the thickness is less than 0.2 mm, the retainer layer can retain its original liquid retainability, which is advantageous in terms of electric resistance, but between the positive and negative electrodes. This is because the effect of preventing a short circuit is reduced.

In the method for producing an active material invasion prevention sheet, each of the above-mentioned materials is dispersed in water using a mixer such as a pulper, and the material concentration in water is adjusted so that the desired sheet weight and thickness are obtained. The material is introduced onto the wire of a normal papermaking machine such as a cylinder, a Fourdrinier, and a shortdrain to be dehydrated, and dried through a contact type cylindrical dryer or a hot air circulation type box dryer to obtain a target sheet. .

Next, a method of forming a composite retainer for a sealed lead-acid battery will be described in detail. The materials used are a retainer for a sealed lead acid battery mainly composed of an active material invasion prevention sheet and glass fiber prepared by the above-mentioned wet papermaking method, and an adhesive such as acrylic or styrene having a Tg of 30 ° C or higher. is there. As these adhesives, emulsion type ones dispersed in water or ones diluted with a solvent are used. As the material of the acrylic adhesive, one made of various alkyl methacrylate, alkyl acrylate and styrene derivative is used. As the material of the styrene-based adhesive, a copolymer of polystyrene and a material such as nitrile, butadiene, acrylic acid or the like is used.

The adhesive has a viscosity of 100 to 10 when used.
Used as 00 cps. If the viscosity is less than 100 cps, the active material intrusion prevention sheet and the retainer for a sealed lead-acid battery are soaked into the retainer, and the adhesion at the interface between the two tends to be insufficient. Also, the area soaked in is easy to spread,
It may reduce the effective area of the retainer. On the other hand, when the viscosity exceeds 1000 cps, not only the workability of applying the adhesive is deteriorated, but also a thickness is generated in the adhesive applying portion, which causes a gap between the active material intrusion prevention sheet and the sealed lead acid battery retainer. It is easy to occur. If a gap is formed between the two, the battery charging / discharging reaction of the electrode plate near the gap portion is hindered, which causes a decrease in battery capacity. In addition, the penetration into the active material intrusion prevention sheet and the sealed lead acid battery retainer is poor, and even if they are adhered, only the surface of the active material intrusion prevention sheet and the sealed lead acid battery retainer is adhered, which makes it easy to peel off. .

The component concentration of the adhesive is a concentration sufficient to bond the active material invasion prevention sheet and the retainer for a sealed lead storage battery, and is preferably in the range of 10 to 50 wt%. The viscosity at the time of using the adhesive may be adjusted by using various thickeners or, in the case of the emulsion type, by increasing the viscosity by adding a predetermined amount of alkali to the emulsion.

As a method of bonding the active material intrusion prevention sheet and the sealed lead acid battery retainer to each other, as shown in FIG. 1, the rectangular active material intrusion prevention sheet 1 cut into a predetermined size has two opposite sides. The above-mentioned acrylic adhesive 2 is applied linearly or intermittently to the end portions 5 to 10 mm to form droplets of the adhesive 2. At this time, the adhesive 2 is also soaked into the inside of the active material intrusion prevention sheet 1. The sealed lead-acid battery retainer 3 is placed on top of it and stacked, the droplets of the adhesive 2 are sucked into the retainer 3, and the active material intrusion prevention sheet 1 and the sealed lead-acid battery retainer 3 are bonded at the interface. The composite retainer 4 for a sealed lead-acid battery is configured. After that, when the adhesive 2 is an emulsion type, water is dried, and when the adhesive 2 is a solvent dilution type, the solvent is dried and evaporated. Incidentally, reference numeral 5 in the figure denotes an adhesive portion.

Further, as shown in FIG. 2, a band having a width of 10 mm is adhered to an arbitrary position of the active material intrusion prevention sheet 1 with a space corresponding to the width dimension of the intended composite lead-acid battery retainer 4. Agent 2 is continuously applied in the length direction of active material intrusion prevention sheet 1, and retainer 3 for a sealed lead-acid battery is applied thereon.
Place on top of each other and dry to form a composite. When cutting into a predetermined size, the width of the band-shaped adhesive portion 5 is cut into two equal parts, so that the two ends 5 mm of the opposite sides of the square-shaped hermetic lead-acid battery composite retainer 4 are opposed to each other. Part 5
Can be arranged. Incidentally, reference numeral 6 in the drawing indicates a cut portion.

Adhesive 2 application section and resulting adhesion section 5
Is not limited to a continuous band, but may be an intermittent discontinuous pattern as shown in FIG. The hermetically sealed lead acid battery composite retainer produced by such a method facilitates battery assembly by the stacker method because the side edges are reinforced by the adhesive. Also, in the part to which the adhesive is applied, the sheet and retainer are clogged, and the electrolyte retention capacity and ionic conductivity are reduced, but by arranging this part at the outer end part of the battery electrode plate, It is possible to avoid problems such as capacity reduction.

Next, specific examples of the present invention will be described. (Example 1) As a retainer for a sealed lead-acid battery mainly composed of glass fibers, glass fibers having an average fiber diameter of 1 μm were dispersed in water, led on a wire for papermaking, and formed into a sheet by an ordinary papermaking method. 0.75 mm, density 0.15 g / c
An m ³ glass fiber retainer sheet was used. On the other hand, as an active material invasion prevention sheet, 50 wt% of silicate powder having a specific surface area of 200 m ² / g and 30 wt% of polyethylene pulp
%, 15% by weight of polyester monofilament, and 5% by weight of glass fiber having a fiber diameter of 5 μm, formed into a sheet by an ordinary papermaking method, having an average pore diameter of 2 μm and a thickness of 0.25 m.
m, density 0.40 g / cm ³ , electric resistance 0.0007Ω
-A sheet having 100 cm ³ / sheet and a porosity of 75 vol% was used. The active material intrusion prevention sheet has a property that it can also be used as a separator for a liquid lead storage battery. The method of compounding (bonding) both sheets is to adjust the viscosity to 500 cps by thickening ammonia, solid content 1
Adhesive was obtained by applying an acrylic emulsion of 5 wt% and Tg of 50 ° C. as an adhesive to a rectangular active material intrusion prevention sheet cut into a predetermined size, and applying the adhesive in a strip shape with a width of 5 mm to the ends of two opposite sides. The glass fiber retainer sheet (retainer for sealed lead-acid battery) is placed on it to suck the droplets into the retainer, and the interface between the active material intrusion prevention sheet and the retainer for sealed lead-acid battery I glued it in. Then, the acrylic emulsion was dried to evaporate the water content, and the composite retainer for a sealed lead-acid battery of the present invention was obtained.

(Example 2) An active material invasion prevention sheet is composed of 50 wt% silicate powder having a specific surface area of 200 m ² / g, 5 wt% polyester monofilament, 25 wt% glass fiber having a fiber diameter of 1 μm, and 20 wt% acrylic resin. , Average pore size 5μ made into sheet by ordinary papermaking method
m, thickness 0.25 mm, density 0.40 g / cm ³ , electric resistance 0.0003 Ω · 100 cm ² / sheet, porosity 80 v
A composite retainer for a sealed lead-acid battery of the present invention was obtained in the same manner as in Example 1 except that the ol% sheet was used.

Example 3 As a retainer for a sealed lead-acid battery mainly composed of glass fibers, a glass sheet having a thickness of 0.50 mm and a density of 0.15 g / cm ³ formed by using glass fibers having an average fiber diameter of 1 μm. The fiber retainer sheet was used and the specific surface area of the active material intrusion prevention sheet was 2
15 wt% of silicate powder of 00 m ² / g, 5 wt% of diatomaceous earth,
40 wt% polyethylene pulp, 5 wt% polyester monofilament, 20 μm fiber diameter glass fiber 20
It is composed of wt% and kraft pulp 15 wt%, and is formed into a sheet by an ordinary papermaking method, having an average pore diameter of 8 μm and a thickness of 0.5.
0 mm, density 0.40 g / cm ³ , electric resistance 0.001
A composite retainer for a sealed lead-acid battery of the present invention was obtained in the same manner as in Example 1 except that a sheet having 2Ω · 100 cm ² / sheet and a porosity of 70 vol% was used.

Example 4 As a retainer for a sealed lead-acid battery mainly composed of glass fibers, glass fibers having an average fiber diameter of 0.5 μm were formed into a sheet having a thickness of 0.75 mm and a density of 0.14 g / cm ^3. A composite retainer for a sealed lead-acid battery of the present invention was obtained in the same manner as in Example 1 except that the glass fiber retainer sheet of was used.

(Embodiment 5) Glass having a thickness of 0.75 mm and a density of 0.16 g / cm ³ formed as a sheet by using glass fibers having an average fiber diameter of 2 μm as a retainer for a sealed lead-acid battery mainly composed of glass fibers A composite retainer for a sealed lead-acid battery of the present invention was obtained in the same manner as in Example 1 except that a fiber retainer sheet was used.

(Example 6) As a retainer for a sealed lead-acid battery mainly composed of glass fibers, a sheet formed by using 50 wt% of glass fibers having an average fiber diameter of 0.7 μm and 50 wt% of glass fibers having an average fiber diameter of 4 μm. A composite retainer for a sealed lead-acid battery of the present invention was obtained in the same manner as in Example 1 except that a glass fiber retainer sheet having a thickness of 0.75 mm and a density of 0.15 g / cm ³ was used.

(Embodiment 7) As a retainer for a sealed lead-acid battery mainly composed of glass fiber, 50 wt% of glass fiber having an average fiber diameter of 0.7 μm, 40 wt% of glass fiber having an average fiber diameter of 4 μm and a chop having an average fiber diameter of 15 μm were used. 0.75 m thick sheeted using 10 wt% of dostrand glass
A composite retainer for a sealed lead-acid battery of the present invention was obtained in the same manner as in Example 1 except that a glass fiber retainer sheet having m and a density of 0.17 g / cm ³ was used.

(Example 8) The same retainer as in Example 1 was used as the retainer for the sealed lead acid battery mainly composed of glass fiber, the active material intrusion prevention sheet, and the composite agent, and both sheets were used. The method of compounding (bonding) is changed, and as shown in FIG. 3, the rectangular active material intrusion prevention sheet cut into a predetermined size has a width of 5 mm and a length of 1 at the opposite ends of the sheet.
Droplets of 0 mm adhesive are formed at intervals of 20 mm, and a glass fiber retainer sheet is placed on top of this to allow the droplets to be sucked into the retainer, and at the interface between the active material intrusion prevention sheet and the sealed lead acid battery retainer. I glued it. After that, dry the acrylic emulsion to evaporate the water,
The composite retainer for sealed lead-acid batteries of the present invention was obtained.

(Comparative Example 1) The same retainer as in Example 1 was used as the retainer for the sealed lead-acid battery mainly composed of glass fiber, the active material intrusion prevention sheet, and the compounding agent. By changing the method of compounding (bonding), as shown in FIG. 4, the square active material intrusion prevention sheet 1 cut into a predetermined size is divided into three equal parts in the width direction, and the width 5 is formed on two lines.
The adhesive 2 is applied in the form of a strip of mm to form droplets of the adhesive 2, and a glass fiber retainer sheet (retainer for sealed lead-acid battery) 3 is placed on the adhesive 2 to drop the droplets of the adhesive 2. Sheet to prevent intrusion of active material 1 by sucking into retainer 3
And the retainer 3 for the sealed lead-acid battery were bonded at the interface. Then, the acrylic emulsion was dried to evaporate the water content to obtain a composite retainer for a sealed lead storage battery. This composite retainer uses an adhesive that increases the rigidity, but since both ends are not reinforced, it is easily bent by a lateral stress. Therefore, stacker assembly cannot be performed, and a sealed lead-acid battery is manufactured by a method of assembling batteries by sandwiching them one by one between the positive and negative electrode plates.

(Comparative Example 2) The same retainer and active material invasion preventive sheet as in Example 1 were used for the sealed lead-acid battery mainly composed of glass fiber, and a solid adhesive was used as an adhesive for compounding. A nitrile rubber adhesive having a viscosity of 800 cps and using methyl ethyl ketone (2-butanone) as a dispersion solvent at a content of 30 wt% was used. A method of compounding (bonding) both sheets is to apply an adhesive in the form of a strip having a width of 5 mm to the ends of two opposite sides of a square active material intrusion prevention sheet cut into a predetermined size, and A glass fiber retainer sheet was placed on and adhered. Then, the dispersion solvent was evaporated to obtain a composite retainer for a sealed lead storage battery. Since this composite retainer does not use an adhesive that increases rigidity,
Stacker assembly is not possible, and sealed lead-acid batteries are manufactured by a method of assembling batteries by sandwiching them one by one between the positive and negative electrode plates.

(Comparative Example 3) The same retainer and active material intrusion prevention sheet for sealed lead-acid battery as mainly composed of glass fiber were used as in Example 1, and both were not stuck together when compounded. A roll-shaped composite retainer for a sealed lead acid battery was obtained. When assembling a sealed lead-acid battery using this composite retainer, stacker assembly cannot be performed.A predetermined amount of composite retainer is pulled out from the roll, cut into a predetermined size, and then sandwiched between the Yin and Yang electrode plates to assemble the battery. by.

(Conventional Example 1) As a retainer for a sealed lead-acid battery mainly composed of glass fibers, a glass fiber having an average fiber diameter of 0.7 μm is dispersed in water, guided on a wire for papermaking, and a sheet is formed by a usual papermaking method. Then, a retainer for a conventional sealed lead-acid battery made of glass fiber having a thickness of 1.00 mm and a density of 0.15 g / cm ³ was obtained.

(Conventional Example 2) As a retainer for a sealed lead-acid battery mainly composed of glass fibers, 50 wt% of glass fibers having an average fiber diameter of 0.7 μm and 50 wt% of glass fibers having an average fiber diameter of 4 μm are dispersed in water to produce paper. Then, the sheet was guided to a conventional wire and formed into a sheet by an ordinary papermaking method to obtain a conventional sealed lead-acid battery retainer made of glass fiber having a thickness of 1.00 mm and a density of 0.15 g / cm ³ .

(Prior art example 3) As a composite retainer for glass-fiber sealed lead acid batteries, the average fiber diameter is 0.7 μm.
m glass fiber 50 wt%, average fiber diameter 4 μm glass fiber 40 wt% and chopped strand glass 10 wt% having an average fiber diameter 15 μm are dispersed in water, led onto a papermaking wire, formed into a sheet by a normal papermaking method, and have a thickness of 1.
A conventional retainer for a sealed lead acid battery made of glass fiber having a diameter of 00 mm and a density of 0.17 g / cm ³ was obtained.

The composite retainers for sealed lead-acid batteries of the present invention in Examples 1 to 8 above, Comparative Examples 1 to 3 and Conventional Examples 1 to 3
About the composite retainer for sealed lead-acid battery of
A slip resistance test, an oxidation resistance test, and a retainer short resistance test (drilling strength test) were performed. Each test method is as follows. Rigidity test: Carried out according to the stiffness test method of a paperboard (Taber type stiffness test) according to the load bending method of JIS P8125. Slip resistance test: As shown in the schematic diagram of the test method in FIG. 5, 100 mm × 10 from each composite retainer 4 for sealed lead-acid batteries
Three 0 mm square samples are taken, three of them are piled up, and a 500 g weight 8 is placed on the sample with a glass plate 7, and a vertical load is applied. At this time, the center (second sheet) of the three sheets is stacked in the pulling direction of the sample with a shift of 5 mm as a grip margin. The gripping margin is sandwiched by clips 9, the ends of the clips 9 are connected to the load cell 10, the central sample is pulled at a speed of 50 mm / min, and the pulling load at the time of starting movement is read from the recorder and used as the slip resistance value. . Oxidation resistance life test: JRS37506-1E-15AR7
The synthetic separator for storage batteries of A was performed in accordance with the 3.4 oxidation resistance test method. As shown in the schematic diagram of the test method in FIG.
Specifically, it is as shown below. 120W x 90L
× 180H mm battery case 11, specific gravity 1.300 (at20
Dilute sulfuric acid 12 ^{℃) 500cm 3, 50W × 50L} × 3
Two Tmm pure lead electrodes 13, 50W x 50L x 1T
2 mm pure lead electrode plates 14, 70W x 70L x
Two 5T mm glass plates 15, bottom of which is 50W x 50L
Weight 5.0 kg in mm 16, 70W x 70L mm
A sample of the composite retainer 4 for sealed lead-acid battery of 1 is prepared.
Next, in the center of the battery case 11, the glass plate 15 and the pure lead electrode 1
3, a pure lead electrode contact plate 14, a hermetically sealed lead storage battery composite retainer 4, a pure lead electrode contact plate 14, a pure lead electrode 13, a glass plate 15, a weight 16 are laminated in this order, and the lower electrode 13 is attached. The negative electrode 13 and the upper electrode 13 are connected to a power source (not shown) with the positive electrode 13 being positive. 500 cm ³ of dilute sulfuric acid 12 having a specific gravity of 1.300 (at 20 ° C.) was added thereto and placed in a water tank kept at 50 ± 2 ° C. After that, a current of 2.5 A is continuously applied, the potential difference between both electrodes is recorded, and the potential difference decreases by 0.5 V (short circuit).
The time to do was measured. The longer this time is, the better the retainer separator is in oxidation resistance and short circuit resistance. Retainer short-circuit resistance test (drilling strength test): A square sample of 50 mm x 50 mm was prepared from each sealed lead-acid battery retainer, and the sample was pretreated at 105 ° C for 30 minutes.
Let dry for minutes. This sample is fixed by being sandwiched between two fixing plates having holes with a diameter of 15 mm. On the other hand, using an auto strain equipped with a load cell (Yonekura Seisakusho Co., Ltd.) (common name: Autograph) as a test device, a steel rod with an outer diameter of 2.0 mmφ was fixed to the upper chuck of this auto strain, and the lower part was described above. Fix the fixing plate with the retainer in between. 15mm steel rod fixed to the upper chuck
The load until the steel rod penetrates the retainer is detected at the load cell at a constant speed of / min, and continuously recorded by a recorder. The maximum value is used as the retainer punching strength. Composite retainers for sealed lead-acid batteries of the present invention of Examples 1 to 8, Comparative Examples 1 to 3 and Conventional Example 1 to 1
Table 1 shows the results of the above-mentioned tests performed on the retainer for sealed lead-acid battery No. 3 described above.

[0035]

[Table 1]

As is clear from Table 1, Example 1 of the present invention
When comparing ~ 8 with the conventional example, the rigidity value shows a value nearly three times, and the slip resistance decreases by 40 to 70%. In this way, the composite retainer for sealed lead-acid batteries, which has high rigidity and low slip resistance, can perform stacker assembly when assembling the sealed lead-acid battery, and can significantly improve the productivity of the sealed lead-acid battery. . On the other hand, when comparing Examples 1 to 8 of the present invention with the conventional example, the oxidation resistance life time becomes 2 to 5 times longer. This indicates that the composite retainer for a sealed lead-acid battery of the present invention is highly resistant to a short circuit caused by the lead powder crawling into the retainer when used in a sealed lead-acid battery. It has the effect of significantly improving the life of lead acid batteries. Also, regarding the punching strength, the composite retainer for a sealed lead-acid battery of the present invention has a strength of 1.5 to 2 times that of the conventional retainer, and the unevenness of the electrode plate that occurs during the assembly of the sealed lead-acid battery. It is possible to prevent biting into the retainer, penetration of the active material into the retainer, and the like, thereby reducing assembly defects when producing a sealed lead acid battery and improving yield.

[0037]

According to the present invention, since the retainer for the sealed lead-acid battery has the layer having the function of preventing the intrusion of the active material, the end of the electrode plate is retained when the electrode plate group is pressed when being incorporated in the battery. It is possible to prevent a short circuit due to strong pressure on the electrode, and a short circuit due to the convex portion of the electrode plate pressing the retainer strongly when the surface smoothness of the electrode plate is poor. In addition, when the battery is used after being incorporated into the battery, a short circuit occurs due to the electrode plate repeatedly expanding and contracting during repeated charging and discharging,
It is also possible to prevent a short circuit or the like caused by fine lead powder getting into the retainer during repeated charging and discharging. Therefore, defective batteries can be reduced in the sealed lead-acid battery manufacturing process, and the production yield can be improved. In addition, the life of the sealed lead acid battery can be significantly improved. On the other hand, by using the retainer for a sealed lead-acid battery of the present invention capable of stacking the sealed lead-acid battery in a stacker system, the productivity of the sealed lead-acid battery can be dramatically improved as compared with the conventional one. .

[Brief description of drawings]

FIG. 1 is a side view of a composite retainer for a sealed lead-acid battery of the present invention, FIG. 1a shows a state before compounding, and FIG. 1b shows a state after compounding.

FIG. 2 is a side view of a composite retainer for a sealed lead-acid battery of the present invention, FIG. 2a shows a state before compounding, and FIG. 2b shows a state after compounding.

FIG. 3 is a plan view of a composite retainer for a sealed lead acid battery according to the present invention.

FIG. 4 is an explanatory view of a composite retainer for a sealed lead-acid battery of a comparative example, FIG. 4a is a plan view before compounding, FIG. 4b is a side view before compounding, and FIG. 4c is a side view after compounding. is there

FIG. 5 is a schematic diagram of a slip resistance test method.

FIG. 6 is a schematic diagram of an oxidation resistance life test method.

[Explanation of symbols]

 1 Active Material Intrusion Prevention Sheet 2 Adhesive 3 Retainer for Sealed Lead-Acid Battery 4 Composite Retainer for Sealed Lead-Acid Battery 5 Adhesive Part 6 Cutting Point 7 Glass Plate 8 Weight 9 Clip 10 Load Cell 11 Battery Case 12 Dilute Sulfuric Acid 13 Pure Lead Electrode 14 Pure lead electrode contact plate 15 Glass plate 16 Weight

Claims (5)

[Claims] 1. An active material intrusion prevention sheet made of a wet papermaking sheet is provided on the entire surface of at least one surface of a retainer for a sealed lead storage battery mainly made of glass fiber, and at least one pair of opposing sides of the outer periphery thereof is provided. A composite retainer for a sealed lead storage battery, which is joined by an adhesive having a glass transition point of 30 ° C. or higher. 2. The hermetically sealed lead acid battery retainer comprising glass fibers as a main component is mainly characterized by glass fibers having an average fiber diameter of 0.3 to 5 μm. Compound retainer. 3. The active material invasion prevention sheet comprises inorganic powder, glass fiber, and a binder component such as synthetic pulp, synthetic fiber, synthetic resin and natural pulp as main constituent components,
Average pore size 0.1-10 μm, thickness 0.05-1.0 mm
The composite retainer for a sealed lead-acid battery according to claim 1 or 2, wherein 4. The active material intrusion prevention sheet has a thickness of 0.
The composite retainer for a sealed lead storage battery according to claim 3, wherein the composite retainer has a thickness of 2 to 0.7 mm. 5. A viscosity of 1 on at least one pair of opposite sides of the outer periphery of an active material intrusion prevention sheet prepared by a wet papermaking method.
An adhesive having a glass transition point of 30 ° C. or more and a glass transition point of 0 to 1000 cps is applied, and the active material intrusion prevention sheet and a retainer for a sealed lead-acid battery mainly composed of glass fiber are overlapped with each other to allow the adhesive to soak into them, A method for manufacturing a composite retainer for a sealed lead-acid battery, which is characterized by joining.