JPS5834563A - Manufacture of storage battery container - Google Patents

Abstract

PURPOSE:To obtain a container for a storage battery which has a rigidity and suitable for a super large battery by wrapping the outer surface of an interior member with a preliminary formed body consisting of reinforced fiber, and pouring an unhardened resin into the space formed between the interior member and the preliminary formed body before the resin is hardened so as to make an exterior member. CONSTITUTION:A container 1 for a storage battery consists of an interior member 2 and an exterior member 3. The interior member 2, which directly touches electrolyte, is prepared from an olefin-system synthetic resin, such as polypropylene, which has an excellent electrolyte resistant property. The exterior member 3, which gives a rigidity to the container 1, is prepared from a synthetic resin containing reinforced fiber. A saddle 9 is provided on the bottom of the container 1. Ribs 10 are provided inside the container 1. The saddle 9 and the ribs 10 are used for positioning plates inside the container 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a storage battery case, and more particularly, to a method for manufacturing a storage battery case having a rigidity suitable for large to ultra-large size storage battery cases.

Large to extra-large storage batteries are generally used for stationary use as backup power sources or independent power sources.

In particular, what has been attracting attention recently is the charging of late-night electricity.
This is a storage battery to improve the efficiency of power consumption. Furthermore, in applications where an internal combustion engine cannot be used, electric power is used as a power source, and in this case, storage batteries play an important role as an independent power source. Such storage batteries are required to be large or very large, and accordingly, storage battery containers are also large or very large.

Conventionally, large or extra-large storage battery containers such as those mentioned above are
Manufactured by ebonite. However, a storage battery case made of ebonite not only takes time to manufacture, but also has the disadvantage that it is quite heavy.

On the other hand, recently, synthetic resins have been increasingly used as materials for storage battery containers. Among these, polypropylene is particularly suitable as a storage battery case material because it has excellent electrolyte resistance such as chemical resistance and heat resistance.

However, when a large or extra-large storage battery case as described above is made of synthetic resin such as polypropylene, it is extremely difficult to obtain a storage battery case with satisfactory strength due to its low rigidity. there were.

Currently, there are examples of storage battery containers constructed with a wall thickness of 20 to 25 mm, but as the wall thickness increases, the curing time is extremely long, and there are also quality problems such as "sink marks" and bubbles. There are also many problems with molding technology, and product costs are skyrocketing.

Furthermore, as mentioned above, even if a storage battery case is made of polypropylene with a considerable wall thickness, it will end up being heavy, just as in the case of ebonite, and it is desirable to improve this point. .

Therefore, the main object of the present invention is to provide a method for manufacturing a storage battery case that can advantageously achieve light fogging.

In summary, this invention comprises an interior material made of a material such as an olefin resin that has properties favorable to an electrolytic solution, and the outer surface of this interior material is wrapped with a preformed body made of a collection of reinforcing fibers. Then, in the mold, uncured resin is injected into the space filled with the preform, and this uncured resin is cured to form the exterior material and the interior material as described above. This is a method for manufacturing a storage battery case, which attempts to obtain a storage battery case consisting of a battery case and an exterior material.

Other objects and features of the present invention will become more apparent from the detailed description given below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of an example of a storage battery case obtained by implementing the present invention. Figure 2 is the same as Figure 1.
FIG.

The storage battery container 1 shown here is intended to be a large to extra large storage battery container, and its dimensions are approximately 5Qc square and approximately 120 to 150C square in height. The structure is a part of the device consisting of an interior material 2 and an exterior material 3, and is made of an olefin-based synthetic resin such as polypropylene that has excellent electrolyte resistance. The exterior material 3 provides rigidity to the storage battery case 1,
Composed of synthetic resin containing reinforcing fibers. Interior material 2 is
This also solves the problem of electrolyte penetration into the exterior material 3 made of such a material.

A large or extra-large storage battery case 1 is often provided with a step 4 for suspending an electrode plate (not shown). Further, a step 7 for positioning the lid 6 may be formed around the opening 5 of the storage battery case 1.
Although it is shown as being composed of an interior material 2 and an exterior material 3, it is only preferable to do it like this, and since the electrolyte/liquid will not reach the lid 6, the lid should not be closed. Such a configuration in 6 is not necessarily required.

Note that the connection between the storage battery case 1 and the lid 6 is achieved by pitch, adhesive 8, or other methods.

A saddle 9 is formed at the bottom of the storage battery case 1 . A bulge 10 is formed on the inner side surface of the storage battery case 1. these saddles 9
The ribs 10 are for positioning the electrode plates within the storage battery case 1.

Next, a method for manufacturing the storage battery case 1 as described above will be explained.

FIG. 3 is a perspective view showing the appearance of the interior material shown in FIGS. 1 and 2. FIG. Since the interior material 2 defines the inner surface shape of the storage battery case 1, the steps 4, saddle 9, and lip 10 are left as they are. The interior material 2 is most preferably integrally molded from polypropylene or the like.

However, if this integral molding is difficult due to the above-mentioned dimensions, it may be molded in parts,
They may be joined together with bales to form a shape as shown in FIG. Some examples will be explained below.

First, the lower part and the upper part are divided by the cutting line 11 in FIG. 3, and this upper part is further divided by the cutting line 11.
It is conceivable to cut the three parts into left and right parts, respectively, and mold them separately, and then join them together later. In this case, not only injection molding but also blow molding or rotational molding can be advantageously used, particularly for the portion below the cutting line 11. Especially when the molded parts can be constructed in one piece, such as in blow molding or rotational molding.
It is preferable that at least a portion at a height that can be reached by the electrolytic solution surface is integrally molded. In this case, the above-mentioned cutting line 11 is
It is sufficient to set it further above the position shown in FIG. Note that, if possible, it is of course preferable that the entire inner member 2 be integrally blow-molded or rotation-molded. Heat welding is advantageously used when joining separately molded parts together.

During this thermal welding, a protrusion of 1 ml occurs at the welded portion, but it is preferable to leave it as it is at least on the outer surface side. The reason for this will become clear from the explanation below.

Alternatively, there is also a method in which the two left and right parts cut only along the cutting line 12 are individually molded and then joined together later. Furthermore, as shown in FIG. 8, for storage battery containers in which something equivalent to the stage 4 is not formed, two parts divided by a cutting line 13 extending in the diagonal direction of the opening 5 are molded. This may be joined later.

FIG. 4 is a perspective view showing a state in which the outer surface of the interior material shown in FIG. 3 is wrapped with a preformed body made of a set of reinforced II fibers. FIG. 5 is an illustrative cross-sectional view illustrating a method for manufacturing the preform shown in FIG. 4. As shown in Fig. 4, the reinforcement machine 11114
The preformed body 15 consisting of a set of is formed in advance into a shape that follows the outer surface of the interior material 2. However, since the preform has a certain amount of leeway against deformation of its shape,
It is not necessarily necessary to mold it to match the outer surface of the interior material 2. The preform 15 is formed, for example, as shown in FIG. Vacuum suction is applied to the inside of the cage 16, which has an outer B-shape corresponding to the desired shape of the preform 15. A large number of ventilation holes 17 are formed in a distributed manner on the surface of the cage 16. In this state, when a glass fiber of, for example, 501 m long is sprayed as the reinforcing fiber 14, the reinforcing machine 11114 is distributed along the outer surface of the cage 16 in a negative shape. When the reinforcing fibers 14 are formed to have an appropriate thickness, spraying an adhesive allows the collection of reinforcing fibers 14 to maintain the shape along the outer surface of the cage 16. The preformed body 15 obtained in this way is the fourth
As shown in the figure, it is placed over the outer surface of the interior material 2 to wrap it.

FIG. 6 is a sectional view corresponding to the cross section taken along line Vl-4 in FIG. 1, showing the relationship between the mold and its molding school in the uncured resin injection process. The interior material 2 whose outer surface is covered with the preform 15 is placed in a mold. This mold defines a male wall surface 19 that contacts the inner surface of the inner ring material 2 and a female wall surface 19 that is separated from the outer surface of the inner ring material 2 by a predetermined distance across the preform 15. be. Of these, male wall 1
8 is defined by the outer surface of the male mold 20. Female W! The wall surface 9 has a first female mold 21 and a 211th mold divided into two on the left and right.
Defined by mold 22 and each inner surface. It is preferable that the mold is divided into the first mold 21 and the twenty-first mold 22 because the distance traveled by the preform 15 and the mold while rubbing against each other becomes shorter in the operation of closing the mold. When the relatively soft preform 15 rubs against the mold over a relatively long distance, the preform 15 may be damaged.

This prisoner, in the case of FIG. 6, the first female mold 21 and the second female mold 2
In the closing operation with the preform 15, the distance between the preform 15 and the preform 1 can be kept to a minimum.
There is no damage as shown in No. 5, which is preferable.

Space 23 formed between male mold 20 and female mold 21.22
The shape corresponds to the shape of the outer ring material 3 shown in the first factor and FIG. At the bottom of the female mold 21.22,
A passage 24 communicating with the space 23 is formed. The passage 24 is provided with a nozzle 25 through which uncured resin is injected. The uncured resin is injected from the bottom of the battery case 1 in the vertical relationship shown in FIG. 6, that is, with the opening 5 of the storage battery case 1 facing upward. Preferably, the injection is directed upwards. In this way, air bubbles are advantageously prevented from remaining within the preform 15 when the uncured resin is injected.

When the uncured resin contains the reinforcing fibers 14 and fills the space 23, the injection of the uncured resin from the nozzle 25 is stopped.

As the uncured resin, for example, unsaturated polyester resin is used. This unsaturated polyester resin is a thermosetting resin and is cured by heat or a suitable catalyst.

In this way, when the resin containing the reinforcing fibers 14 is cured, the molds 20, 21 and 22 are separated and the storage battery case 1 is taken out therefrom.

FIG. 7 shows a part of FIG. 6 in an enlarged manner. Referring to FIG. 7, a plurality of protrusions 26 are formed on the outer surface of the interior material 2. As shown in FIG. This protrusion 26 is preferable because it increases the bonding force with the resin constituting the exterior material 3. The shape of this protrusion 26 is arbitrary and can be modified as described below.

First, as mentioned above, the interior material 2 is partially molded,
The protrusion of resin at the welded portion that occurs when heat welding is performed later can be used in place of the protrusion 26. Furthermore, as shown in FIG. 8, when the interior material 2 is obtained by joining parts dissected along the diagonal cutting line 13, the projections 26 can be formed to extend diagonally. . This is because the direction in which the protrusions 26 protrude corresponds to the direction in which the molds for molding each part of the interior material 2 are separated, and the portion divided by the diagonally directed cutting line 13 is
It is possible to move the mold in the direction in which the protrusion 26 projects. Such obliquely oriented protrusions 26 will further increase the bonding force between the interior material 2 and the exterior material 3.

FIGS. 9 and 10 each show other examples of how the interior material is formed.

FIG. 9 shows that the stage 7 shown in FIGS. 1 and 2 is
The example shown is formed by chisel.

Therefore, the lid 6 is positioned on the step 7 realized by the thickness of the interior material 2.

FIG. 10 shows that the interior material 2 may not be formed almost to the upper end of the exterior material 3. That is, the interior material 2 can perform its original function if it is formed to at least extend beyond the liquid level 27 of the electrolytic solution. According to such a configuration, the dimension in the height direction of the interior material 2 can be shortened, and even if this is integrally molded, the molding can be made somewhat easier.

Although the interior material 2 described above is made of polypropylene, it may be made of other olefin resins, such as polyethylene, or a mixture thereof. Further, the reinforcing fibers 14 are typically glass fibers, but may be other fibers such as carbon fibers. Furthermore, although unsaturated polyester resin was used as the uncured resin, other thermosetting resins and thermoplastic resins can also be used.

Furthermore, the interior material 2 may be made of rubber.

As the rubber, neoprene rubber or natural rubber is advantageously used. When the interior material 2 is made of rubber,
One method is to glue sheets of highly vulcanized rubber to make the box-shaped interior material 2, and the other is to pour unvulcanized rubber into a mold and vulcanize it in this state to obtain the box-shaped interior material 2. is possible. In short, the material constituting the interior material 2 is not limited to olefin resin or rubber, but may be any material as long as it has electrolyte resistance.

Furthermore, if the interior material 2 of the storage battery case 1 and the interior materials 2 and ' of the lid 6 are positively joined by adhesion or welding, there is no need to worry about the electrolyte leaking, and the liquid tightness can be further improved. It can be done.

As described above, according to the present invention, it is possible to form a large or ultra-large storage battery case with a small wall thickness. The resulting wall thickness can be, for example, about 5 to 10 - for the interior and exterior materials combined. Therefore, the lightest storage battery case can be obtained, and the storage battery using this can also be made lighter. Furthermore, the interior material achieves electrolyte resistance, and the exterior material increases the rigidity of the storage battery container, so all properties required for a storage battery container are satisfied. In addition, a storage battery container made of an interior material and an exterior material can be manufactured more efficiently and with stable quality than a storage battery container that is integrally molded.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of an example of a storage battery case obtained by implementing the present invention. Figure 2 is the same as Figure 1.
FIG. FIG. 3 is a perspective view showing the appearance of the interior material shown in FIGS. 1 and 2. FIG. FIG. 4 is a perspective view showing a state in which the outer surface of the interior material shown in FIG. 13 is wrapped with a preformed body made of a set of reinforcing fibers. FIG. 5 is a schematic cross-sectional view illustrating a method for manufacturing the preform shown in FIG. 4. Figure 6 is a summary of mi diagrams Vl-Vl showing the relationship between the mold and its molding space in the uncured resin injection process.
FIG. FIG. 7 shows a part of FIG. 6 in an enlarged manner. FIG. 8 is a plan view of the interior material showing another example of molding the interior material and another example of forming protrusions. FIGS. 9 and 10 each show other examples of how the interior material is formed. In the figure, 1 is a storage battery case, 2 is an interior material, 3 is an outer ring material, 5 is an opening, 14 is a reinforcing fiber, 15 is a preformed body, 18
is the male wall, 19 is the female wall, 20 is the male type, 21.22
is a female mold, 23 is a space, 25 is a nozzle, 26 is a projection, 27
is l2iii. 1 person who received a patent Miyagawa Chemical Industry Co., Ltd. 1st 2nd G country 7 countries 3rd country %lO

Claims (8)

[Claims] (1) Prepare an inner ring material made of an electrolyte-resistant material that defines the inward shape of the electrolytic wave storage portion of the storage battery container having an opening at the top, and from a collection of reinforced SLs shaped to wrap around the outer area of the inner ring material. Prepare a preformed body, and place the interior material whose outer surface is wrapped with the preformed body by sandwiching the preformed body between the surface that contacts the inner surface of the interior material and the outside of the interior material. is placed in a mold that defines a distance between - and the W surface of the shoe, and the male ! II
An uncured resin is injected into a space angle formed between I and the wall surface of the previous record and filled with the preform, so that reinforcing fibers are contained in the uncured resin, and the uncured A storage battery container comprising the steps of curing a resin and taking out from the mold a storage battery container comprising an exterior material made of a resin cured including the reinforcing fibers and the interior material in contact with the inner surface of the exterior material. manufacturing method. (2) The method for manufacturing a storage battery case according to claim 1, wherein the interior material is an olefin resin. (3) The method for manufacturing a storage battery case according to claim 1, wherein the interior material is rubber. (4) The method for manufacturing a storage battery case according to any one of claims 1 to 3, wherein the reinforcing fibers are glass fibers. (5) The method for manufacturing a storage battery case according to any one of claims 1 to 4, wherein an unsaturated polyester resin is used as the uncured resin. (6) The method for manufacturing a storage battery case according to any one of claims 1 to 5, wherein the mold portion defining the wall surface of the previous record is divided into two in the vertical direction of the storage battery case. . (7) The uncured resin is injected upward from the bottom of the storage battery case with the opening of the storage battery case facing upward. A method for manufacturing a storage battery case according to any of the above. (8) The method for manufacturing a storage battery case according to any one of claims 1 to 71, wherein a plurality of protrusions are distributed and formed on the outer surface of the interior material.