JPH08212996A - Electrolyte holding body for sealed storage battery and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide an electrolyte holding body for a sealed storage battery capable of preventing generation of concentration difference in an electrolyte and lengthening the life of the battery. CONSTITUTION: An electrolyte holding body 1 is formed with a nonwoven fabric made of glass fiber made paper sheet having a constant fiber density. In the electrolyte holding body 1, the thickness is continuously varied so that a portion 1b corresponding to the upper part of an electrode plate is made thicker than a portion 1a corresponding to the lower part of the electrode plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic solution holder for a sealed storage battery, which is used by interposing electrode plates in a sealed storage battery such as a sealed lead storage battery used as a power source for industrial equipment or portable equipment. And a manufacturing method thereof.

[0002]

2. Description of the Related Art A conventional electrolyte holding body for a sealed lead-acid battery is
It was a non-woven fabric made of a glass fiber paper having a constant fiber density and a constant thickness. By bending such an electrolyte solution holder and sandwiching each anode plate in a U-shape from below, the cathode plates are arranged on both sides of the anode plate whose both surfaces are covered with the electrolyte solution holder. An electrode plate group was made, and the electrode plate group was housed together with an electrolytic solution in a battery case to produce a sealed lead acid battery.

[0003]

However, even when an electrode plate group is assembled using an electrolyte solution holder having a constant density and a constant thickness, the electrode plate group is housed in the inner wall of the battery case at the time of molding. The width of the upper part of the battery case is wider than the width of the lower part of the battery case because it is easier to mold, so even if the electrode plate group is inserted into the battery case, The pressure received from the battery case is weaker at the upper part of the electrode plate group, so that the fiber density of the electrolyte solution holder at the upper part of the electrode plate group becomes higher than that at the lower part of the electrode plate group. There was a problem. In such a sealed storage battery in which the fiber densities of the electrolytic solution holders are different in the vertical direction, the concentration of sulfuric acid as the electrolytic solution varies in the vertical direction during charging and discharging, which leads to an early life of the battery.

An object of the present invention is to provide an electrolytic solution holder for a sealed type storage battery, which can prevent a difference in concentration of the electrolytic solution and prolong the battery life.

An object of the present invention is to provide a method for manufacturing an electrolytic solution holder for a sealed type storage battery, which can prevent a difference in concentration in the electrolytic solution and prolong the battery life.

[0006]

The electrolytic solution holder for a sealed type storage battery according to claim 1 is made of a non-woven fabric having a constant fiber density, and the thickness of the electrolyte holder is higher in the upper part of the electrode plate than in the lower part of the electrode plate. It is characterized in that it is continuously changed so as to become thicker.

The electrolytic solution holder for a sealed storage battery according to claim 2 is made of a non-woven fabric having a constant fiber density, and its length is about twice the vertical height of the electrode plate. The thickness is continuously changed so that the center is thinner than both ends in the length direction.

A third aspect of the present invention provides the electrolytic solution holder for a sealed type storage battery according to the first or second aspect, wherein the non-woven fabric of the fibers is formed of a fiber paper body.

According to a fourth aspect of the present invention, there is provided a method for manufacturing an electrolytic solution holder for a sealed type storage battery, wherein a thick-walled molded portion including a plurality of recesses is provided at predetermined intervals in one direction, and the thick-walled molded portion is provided between the thick-walled molded portions. Is characterized in that the electrolytic solution holder is manufactured by making fibers using a paper making net whose height is continuously increased so as to form a thin-walled forming part where the surface height is highest in the center. To do.

According to a fifth aspect of the present invention, there is provided a method for manufacturing an electrolytic solution holder for a sealed type storage battery, wherein a thick-walled portion formed of a plurality of recesses is provided at a predetermined interval in one direction, and the thick-walled portion is formed between the thickened portions. Is wound around a papermaking drum, the height of which is continuously high to form a thin-walled part where the height of the surface is maximized at the center of the papermaking drum. A liquid holding body is manufactured.

[0011]

The electrolytic solution holder for a sealed storage battery according to claim 1 is made of a non-woven fabric having a constant fiber density, and the thickness of the electrolyte holder is higher at the upper part of the electrode plate than at the lower part of the electrode plate. Since the structure has changed continuously,
Such an electrolytic solution holder is interposed between an anode plate and a cathode plate to form an electrode plate group, and the electrode plate group is inserted into a battery case to form a sealed storage battery. When the holding body is pressurized to a certain thickness in the battery case, the fiber density of the electrolytic solution holding body in this state is higher in the portion contacting the upper part of the electrode plate than in the portion contacting the lower part of the electrode plate. Therefore, even if the battery is charged and discharged, a difference in the concentration distribution of the electrolytic solution hardly occurs, and the battery has a long life.

The electrolytic solution holder for a sealed type storage battery according to claim 2 is made of a non-woven fabric having a constant fiber density, and the length thereof is about twice the vertical height of the electrode plate. Since its thickness is continuously changed so that the center is thinner than both ends in the lengthwise direction, such an electrolyte holder is U-shaped from both sides of the anode plate from below. By sandwiching and using it, it is possible to reduce the number of used electrolytic solution holders having a special shape and form an electrode plate group.

Since the electrolytic solution holder for a sealed storage battery according to claim 3 is formed of a fiber paper body, the electrolytic solution holder according to claim 1 or 2 is easily formed. be able to.

According to a fourth aspect of the present invention, there is provided a method for manufacturing an electrolytic solution holder for a sealed type storage battery, wherein a thick-walled molded portion including a plurality of recesses is provided at predetermined intervals in one direction, and the thick-walled molded portion is provided between the thick-walled molded portions. Using a papermaking net whose height is continuously high to form a thin-walled molded part where the height of the surface is highest in the center of the papermaking machine, fibers are deposited on the surface of the papermaking net to deposit the fibers. By making paper so that the surface becomes flat, it is easy to manufacture an electrolyte solution holder with a structure in which the thickness changes continuously so that the thickness of the upper part of the plate becomes thicker than that of the lower part. be able to. Further, by increasing the number of repeating irregularities of the papermaking net, it is possible to easily manufacture a plurality of electrolytic solution holders with one papermaking.

According to a fifth aspect of the present invention, there is provided a method for manufacturing an electrolytic solution holder for a sealed type storage battery, wherein a thick-walled molded portion including a plurality of recesses is provided at predetermined intervals in one direction, and between the thick-walled molded portions. Is wound around a papermaking drum whose height is continuously high so that the height of the surface is highest at the center of the papermaking drum, and the surface of the papermaking net is rotated while the papermaking drum is rotated. By making paper so that the fibers are deposited on the plate and the surface of the fibers is flattened, the thickness of the part that hits the upper part of the electrode plate becomes thicker than the part that hits the lower part of the electrode plate. The electrolytic solution holder can be easily and automatically manufactured. Also in this case, a plurality of electrolytic solution holders can be easily manufactured by one papermaking process by increasing the number of repeating irregularities of the papermaking net.

[0016]

1 is a longitudinal sectional view of a first embodiment of an electrolytic solution holder 1 for a sealed storage battery according to the present invention.
The electrolytic solution holder 1 is made of a non-woven fabric of glass fiber having a constant fiber density, and its thickness is continuously changed so that the portion 1b that contacts the upper part of the electrode plate is thicker than the portion 1a that contacts the lower part of the electrode plate. It is structured.

The electrolytic solution holder 1 is interposed between the positive electrode plate and the negative electrode plate to form an electrode plate group, and the electrode plate group is inserted into a battery case to form a sealed lead acid battery. Then, when the electrolytic solution holder is pressurized to a certain thickness in the battery case, the fiber density of the electrolytic solution holder in this state becomes higher in the part that contacts the upper part of the electrode plate than in the part that contacts the lower part of the electrode plate. Therefore, even if this battery is charged and discharged, a difference in the concentration distribution of the electrolytic solution hardly occurs, and the battery has a long life.

FIG. 2 is a vertical sectional view of a second embodiment of the electrolytic solution holder 1 for a sealed storage battery according to the present invention. The electrolytic solution holder 1 is made of a non-woven fabric of glass fiber having a constant fiber density, and its length L is about twice the vertical height of the electrode plate, and its thickness is the length direction. The structure is continuously changed so that the center 1d (the portion corresponding to the lower part of the electrode plate) 1d is thinner than the both ends (the portion corresponding to the upper part of the electrode plate) 1c.

Such an electrolytic solution holder 1 is used by sandwiching both sides of an anode plate in a U-shape from the lower side, so that the number of the electrolytic solution holders 1 having a special shape can be reduced and the electrode plate group can be used. Can be configured. Further, the sealed lead-acid battery formed by using the electrolytic solution holder 1 can obtain the same effect as that of the first embodiment.

FIG. 3 shows the structure of a papermaking net 2 for producing the electrolytic solution holder 1 of the second embodiment. The papermaking net 2 is provided with a thick portion forming portion 2a composed of a plurality of concave portions at predetermined intervals in one direction, and a thin portion having a maximum surface height at the center between the thick portion forming portions 2a. Molding part 2
It has a structure in which the height is continuously increased to be b.

Using the papermaking net 2 having such a structure,
By depositing glass fibers or the like on the surface and making a paper so that the deposited surface of the fibers becomes flat, a multiple electrolyte solution holder 1M as shown in FIG. 4 can be manufactured. Such a multiple electrolyte solution holder 1M can be obtained by cutting a plurality of electrolyte solution holders 1 of the type shown in FIG. 2 by cutting at the center of the thick portion shown by the broken line.

FIG. 5 shows the structure of the papermaking drum 3 for producing the electrolyte solution holder 1 of the second embodiment. The papermaking drum 3 has a structure in which the papermaking net 2 shown in FIG. 3 is wound around the drum.

While the papermaking drum 3 is rotated, glass fibers or the like are deposited on the surface of the papermaking net 2 and the papermaking is performed so that the deposited surface of the fibers becomes flat. It is possible to automatically and easily manufacture the electrolytic solution holder 1 having a structure that continuously changes so that the portion corresponding to the upper part of the electrode plate becomes thicker than the above. In this case as well, by increasing the number of repeating irregularities of the papermaking net 2, it is possible to easily manufacture a plurality of electrolytic solution holders 1 with one papermaking.

In order to confirm the performance of the electrolytic solution holder 1 according to the present invention, the fiber density of each part is almost constant, but as shown in FIG. 2, the thickness gradually increases from the center to both ends. The electrolytic solution holder 1 of the present invention is produced by making glass fiber into paper (invention product), on the other hand, the electrolytic solution holder 1 in which the fiber density of each part is almost constant and the wall thickness of each part is also constant is glass fiber. Table 1 shows the results of comparison between the thickness of each part and the glass fiber density.

[0025]

[Table 1] As is clear from Table 1, the electrolytic solution holder 1 of the product of the present invention
Although the glass fiber density was the same as that of the conventional product, it was confirmed that the thickness was continuously increased from the portion hitting the lower portion of the electrode plate to the portion touching the upper portion of the electrode plate.

The electrolyte solution holder 1 of the present invention as described above is
An electrode plate group was prepared using the number of sheets, the number of anode plates of 7, and the number of cathode plates of 8 to prepare a battery of 60 Ah (battery of the present invention).
Further, as a comparative product, an electrode plate group was formed by using 7 electrolytic solution holders of the conventional product, 7 anode plates, and 8 cathode plates,
A 60 Ah battery (battery used in the conventional product) was manufactured.

The initial capacity characteristics of the batteries used in the present invention and the batteries used in the conventional products are shown in Table 2, discharge: 20 A, final voltage 9.9.
Figure 6 shows the cycle life characteristics of V, charge: 30A, 15V.

[0028]

[Table 2] As is clear from Table 2, the electrolytic solution holder 1 of the present invention product
The battery using the product of the invention using the battery of the invention and the battery using the product of the conventional art using the electrolyte holder of the conventional product have the same 3HR capacity, but the battery using the product of the invention discharges at 1C and 3C. It was confirmed that the battery has a larger capacity than the conventional battery used.

This is because in the conventional battery using the conventional electrolytic solution holder, the group pressure on the upper part of the electrode plate became weak due to the thickness change of the battery case and the sufficient discharge reaction could not be performed. On the other hand, in the battery using the product of the present invention using the electrolytic solution holder 1 of the product of the present invention, the group pressure is sufficiently applied to the upper part of the electrode plate and the glass fiber density at the upper part of the electrode plate is high, so that the concentration of sulfuric acid as the electrolytic solution is high. This is probably because the change in distribution became difficult to occur. However, if the applied pressure at this time is not adjusted to manufacture the battery, the amount of the electrolyte solution retained may be lowered to cause the capacity to decrease.

FIG. 6 shows the cycle life characteristics of the battery using the present invention using the above-described electrolytic solution holder 1 of the present invention and the conventional battery using the conventional electrolyte holding body. It is a thing.

As is apparent from FIG. 6, it was confirmed that the battery using the product of the present invention had better cycle life characteristics than the battery using the conventional product. In this case, due to the effect of the present invention, the high-rate discharge characteristic of the battery was improved by improving the concentration distribution and utilization rate of the electrolytic solution, and the cycle life characteristic was lengthened four times. It is considered that this is because the battery using the product of the present invention was less likely to cause a change in the concentration distribution of the sulfuric acid as the electrolytic solution, and thus obtained good results.

The electrolytic solution holder according to the present invention is not limited to a nonwoven fabric made of a glass fiber papermaking body, but a nonwoven fabric made of a mixed papermaking body of glass fibers and synthetic fibers, or a nonwoven fabric made of a synthetic fiber papermaking body. And so on.

[0033]

As described above, according to the electrolytic solution holder for a sealed storage battery and the method for manufacturing the same according to the present invention, the following excellent effects can be obtained.

The electrolytic solution holder for a sealed type storage battery according to claim 1 is made of a non-woven fabric having a constant fiber density, and the thickness of the electrolyte holder is higher at the upper portion of the electrode plate than at the lower portion of the electrode plate. Since it has a continuously changing structure, such an electrolytic solution holder is interposed between the anode plate and the cathode plate to form an electrode plate group, and the electrode plate group is inserted into the battery case. When a sealed type storage battery is formed by pressurizing the electrolytic solution holder to a certain thickness in the battery case, the fiber density of the electrolytic solution holder in this state is higher than that of the electrode plate upper part than the electrode plate upper part. Therefore, even if the battery is charged and discharged, a difference in the concentration distribution of the electrolytic solution is unlikely to occur, and the life of the sealed storage battery can be extended.

The electrolytic solution holder for a sealed storage battery according to claim 2 is made of a non-woven fabric having a constant fiber density, and its length is about twice the vertical height of the electrode plate. Since its thickness is continuously changed so that the center is thinner than both ends in the lengthwise direction, such an electrolyte holder is U-shaped from both sides of the anode plate from below. By sandwiching and using it, it is possible to reduce the number of used electrolytic solution holders having a special shape and form an electrode plate group.

Since the electrolytic solution holder for a sealed storage battery according to claim 3 is formed of a fiber paper body, the electrolytic solution holder according to claim 1 or 2 is easily formed. be able to.

According to a fourth aspect of the present invention, there is provided a method for manufacturing an electrolytic solution holder for a sealed type storage battery, wherein a thick-walled portion molding portion including a plurality of recesses is provided at predetermined intervals in one direction, and the thick-walled portion molding portions are provided between the thick-walled portion molding portions. Using a papermaking net whose height is continuously high to form a thin-walled molded part where the height of the surface is highest in the center of the papermaking machine, fibers are deposited on the surface of the papermaking net to deposit the fibers. By making paper so that the surface becomes flat, it is easy to manufacture an electrolyte solution holder with a structure in which the thickness changes continuously so that the thickness of the upper part of the plate becomes thicker than that of the lower part. be able to. Further, by increasing the number of repeating irregularities of the papermaking net, it is possible to easily manufacture a plurality of electrolytic solution holders with one papermaking.

According to a fifth aspect of the present invention, there is provided a method for manufacturing an electrolytic solution holder for a sealed type storage battery, wherein a thick-walled portion molding portion including a plurality of recesses is provided at predetermined intervals in one direction, and between the thick-walled portion molding portions. Is wound around a papermaking drum whose height is continuously high so that the height of the surface is highest at the center of the papermaking drum, and the surface of the papermaking net is rotated while the papermaking drum is rotated. By making paper so that the fibers are deposited on the plate and the surface of the fibers is flattened, the thickness of the part that hits the upper part of the electrode plate becomes thicker than the part that hits the lower part of the electrode plate. The electrolytic solution holder can be easily and automatically manufactured. Also in this case, a plurality of electrolytic solution holders can be easily manufactured by one papermaking process by increasing the number of repeating irregularities of the papermaking net.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of an electrolyte solution holder for a sealed storage battery according to the present invention.

FIG. 2 is a vertical cross-sectional view of a second embodiment of an electrolyte solution holder for a sealed storage battery according to the present invention.

FIG. 3 is a transverse cross-sectional view showing the structure of a papermaking net for producing the electrolytic solution holder of the second embodiment.

FIG. 4 is a transverse cross-sectional view of an electrolytic solution holder which is made with the paper making net shown in FIG.

5 is a longitudinal sectional view of a papermaking drum using the papermaking net shown in FIG.

FIG. 6 is a cycle life characteristic diagram of a battery using the product of the present invention using the electrolyte holding body of the present invention and a battery using the conventional product using the electrolyte holding body of the conventional product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrolyte solution holder 1a Part that contacts lower part of electrode plate 1b Part that contacts upper part of electrode plate 1c Both ends 1d Center 1M Multiple electrolyte solution holder 2 Paper making net 2a Thick part forming part 2b Thin part forming part 3 Paper making drum

Claims (5)

[Claims] 1. A hermetically sealed type characterized by comprising a non-woven fabric having a constant fiber density, the thickness of which is continuously changed so that a portion of the upper part of the electrode plate is thicker than a portion of the lower part of the electrode plate. Electrolyte holder for storage batteries. 2. A non-woven fabric having a constant fiber density, the length of which is about twice the height of the electrode plate in the vertical direction, and the thickness of the electrode is greater in the center than at the ends in the length direction. An electrolytic solution holder for a sealed storage battery, which is characterized by being continuously changed so as to be thin. 3. The electrolytic solution holder for a sealed storage battery according to claim 1, wherein the fiber non-woven fabric is formed of a fiber paper body. 4. A thick-walled molded portion having a plurality of recesses formed at predetermined intervals in one direction, and a thin-walled molded portion having a maximum surface height at the center between these thick-walled molded portions. A method for producing an electrolytic solution holder for a sealed type storage battery, which comprises producing a electrolytic solution holder by making fibers from a papermaking net whose height is continuously increased. 5. A thick-walled portion molding portion having a plurality of recesses at predetermined intervals in one direction, and a thin-walled portion molding portion having a maximum surface height at the center between the thick-walled portion molding portions, and An electrolytic solution for a sealed storage battery, characterized in that a papermaking net having a continuously high height is wound around a papermaking drum, and a fiber is made while the papermaking drum is rotated to produce an electrolytic solution holder. Method for manufacturing holder.