JP2944119B2 - Method of manufacturing storage battery lid - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a storage battery lid and a method for manufacturing the same, and in particular, to exhaust gas that is a part of a discharge path for gas generated inside a battery case of a storage battery. The present invention relates to a storage battery lid provided with a chamber and a method for manufacturing the same.

[Prior Art] FIG. 12 is a perspective view showing a state where a cover 1 of a conventional storage battery that is of interest to the present invention is partially exploded.
FIG. 13 is a cross-sectional view taken along line XIII-XIII of FIG.
FIG. 14 is a sectional view taken along the line XIV-XIV in FIG.

As shown in FIG. 13 by a broken line, the lid 1
Is mounted so as to close the upper opening of the battery case main body 3 of the storage battery divided into the plurality of compartments 2.

As shown in FIGS. 12 to 14, the lid 1 is provided with a plurality of exhaust holes 4 individually communicating with the interior of the compartment 2, and formed above the exhaust holes 4 and provided in each of the exhaust holes 4. The exhaust chamber 5 includes a common exhaust chamber 5 and an exhaust pipe 6 extending downward from the exhaust chamber 5 and communicating with the exhaust chamber. An exhaust pipe 7 is connected to the exhaust pipe 6.

In addition, the lid 1 is provided in relation to each compartment 2 of the battery case main body 3,
A liquid stopper 8 is provided. The liquid port plug 8 is for closing the liquid port 9 as shown in FIG. 14, and when the electrolytic solution or pure water is injected from the liquid port 9, the liquid port plug 8 is connected to the liquid port plug 8.
Is removed.

 Further, a pair of terminals 10 is attached to the lid 1.

[Problem to be Solved by the Invention] In the lid 1 described above, the exhaust chamber 5 serving as a gas discharge path needs to be kept airtight. This is because, when the airtightness is poor, the electrolyte may leak out from the wall defining the exhaust chamber 5 to the outside.

In the conventional lid 1, a cover plate 11 is used to form a closed space in the exhaust chamber 5. The cover plate 11 is made of, for example, a thermoplastic synthetic resin, like the lid 1, and is attached to the lid 1 so as to close the exhaust chamber 5 by being joined later. In joining the cover plate 11 to the lid 1, a method such as ultrasonic welding (see Japanese Utility Model Publication No. Sho 54-33072), heat welding, bonding, or the like is used.

However, in the past, the airtightness of the exhaust chamber 5 was often inferior, and therefore, a relatively large number of defective products caused by the inconvenience were generated. Such inconveniences occur when the dimensional accuracy between the cover plate 11 and the lid 1 is poor in many cases because the cover plate 11 is formed separately from the lid 1.

Therefore, an object of the present invention is to provide a method of manufacturing a storage battery lid that can solve the above-described problems.

[MEANS FOR SOLVING THE PROBLEMS] The present invention provides a plurality of exhaust cylinders having an exhaust hole and extending downward, an exhaust chamber formed above the exhaust hole and commonly communicating with each of the exhaust holes, An exhaust pipe formed to extend downward from the chamber and communicating with the exhaust chamber. In order to solve the technical problem described above, according to the present invention, a step of injecting a resin into a mold, and pressurizing an inert fluid with respect to the resin into the resin which has been injected into the mold but not yet solidified. Thereby forming a space to be an exhaust chamber so as to extend into the exhaust pipe and the exhaust pipe.

[Operation] In the method for manufacturing a storage battery lid according to the present invention, the fluid is press-fitted into the resin before solidification, which has been injected into the mold, so that the fluid forms a space to be an exhaust chamber, Pressure is exerted on the surrounding resin and the resin is pressed outwardly toward the mold surface.

In the thus obtained storage battery lid, since the exhaust chamber is formed at the above-described injection molding stage, the exhaust cylinder having the exhaust hole, the exhaust chamber, and the wall forming the exhaust pipe are integrally formed. Can be

[Effects of the Invention] As described above, according to the present invention, since the exhaust pipe having the exhaust hole, the exhaust chamber, and the walls respectively forming the exhaust pipe are integrally formed, the airtightness is always stable and perfect. Can be given. Therefore, the occurrence of defective products due to the lack of airtightness can be eliminated. In addition, it is not necessary to inspect the airtightness, and the production efficiency can be improved.

Further, according to the present invention, since the exhaust chamber is closed, no cover plate is required. Therefore, in manufacturing the lid,
Since there is no need for a separate part such as a cover plate that must be prepared separately, the number of types of molds required for molding can be reduced, and a subsequent joining process is unnecessary, and equipment for that purpose is not required. The burden on the target can be reduced. Also, there is no problem associated with the dimensional accuracy between the components during joining.

Embodiment FIG. 1 to FIG. 3 show a first embodiment of the present invention. Here, FIG. 1 is a sectional view corresponding to FIG. 14 described above, and FIGS. 2 and 3 are sectional views corresponding to FIG.
It is sectional drawing equivalent to a figure. It should be pointed out in advance that parts which are not particularly described below have the configuration described with reference to FIGS. 12 to 14.

1 and 2 show a molded article 12 to be a lid. In addition, these drawings also show forms that the molded article 12 takes in the middle of being manufactured by injection molding. Although the illustration of a mold for injection-molding the molded article 12 is omitted, the shape of such a mold will be obvious from the outer shape of the molded article 12. As shown in FIG. 1, a resin flow path 14 for introducing a resin 13 and a gate 15 are provided in the mold.
Is formed. Also, so as to penetrate the mold and communicate with a predetermined portion of the cavity formed by the mold,
A fluid supply pipe 16 is provided.

In injection-molding the molded product 12, the resin 13 is introduced into the mold cavity via the resin flow path 14 and the gate 15, while a fluid 17 which is inactive with respect to the resin 13 from the fluid supply pipe 16 is provided. Supplied. The point in time at which the supply of the fluid 17 is started is a point in time before the resin 13 injected into the mold cavity has yet to be solidified. For example, after a predetermined time elapses after the resin 13 is started to be injected, the fluid 17 starts to be injected, and at least in the final stage of injection molding,
The resin 17 may be supplied in parallel with the resin 13, or the resin 13 and the fluid 17 may be supplied simultaneously from the beginning. As an example, the fluid 17 is injected at a pressure of 40 kg / cm ² with a delay time of 1.5 seconds from the start of injection of the resin 13.

A gas is preferably used for the fluid 17. This gas may be air, but is preferably an inert gas such as nitrogen or carbon dioxide. Alternatively, instead of fluid 17
Alternatively, a liquid can be used.

When the fluid 17 is still pressed into the resin 13 before solidification, the fluid 17 fills the cavity at the same time as the resin 13 and applies pressure to the surrounding resin 13 so that the resin 13 is applied to the wall surface of the cavity. Press toward. In this way, the fluid 17 forms a space in the molded article 12 to be the exhaust chamber 18 surrounded by the resin 13.

As described above, the resin 13 pressed against the wall surface of the cavity by the pressure from the fluid 17 forms the exhaust pipe 20 that provides the exhaust hole 19, and also forms the exhaust pipe 21. Exhaust stack
Inside each of the exhaust pipe 20 and the exhaust pipe 21, a space communicating with the exhaust chamber 18 is formed.

When the molded article 12 is removed from the mold, the exhaust pipe 20 (a) into which the fluid supply pipe 16 has been inserted is already formed with a through-hole 19 (a). 20
And the exhaust pipe 21 has not yet provided a path to penetrate.
Therefore, as shown in FIG.
And exhaust pipe 21 are perforated and exhaust holes
19 and the exhaust pipe 21 are all penetrated.

 Thus, the lid 12a is completed.

FIG. 4 shows a second embodiment of the present invention. FIG. 4 is a sectional view corresponding to FIG. 2 described above.

In the embodiment shown in FIG. 4, the fluid supply pipe 16 is a molded product.
The position at which the fluid 17 is pressed into the interior 12 is different from that of the embodiment shown in FIG. That is, the fluid supply pipe 16
Is disposed at the position of the exhaust cylinder 20 (b) at the end.
As can be seen from this embodiment, the fluid supply pipe 16 can be disposed at any position of the exhaust
May be arranged at the position.

In FIG. 4, parts corresponding to the parts shown in FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 5 shows a third embodiment of the present invention. FIG. 5 is a sectional view corresponding to FIG. 2 described above.

In the embodiment shown in FIG. 5, fluid is supplied from the fluid supply pipe 16a to all of the exhaust pipes 20 and each of the exhaust pipes 21. That is, the fluid supply pipe 16
a includes a plurality of branch pipes 22, each of which is disposed at a position of each of the exhaust pipes 20 and the exhaust pipes 21. According to this embodiment, when the injection molding is finished, as shown in FIG.
19 and the exhaust pipe 21 are obtained, so that the step of drilling holes by post-processing is not required.

In FIG. 5, portions corresponding to the portions shown in FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 6 and FIG. 7 are for explaining the fourth embodiment of the present invention. In these drawings, a cross section corresponding to the cross section shown in FIG. 1 is partially shown.

As shown in FIG. 6, when the thickness of the molded article 12 is relatively large in the portions 23 and 24 connected to the portion where the exhaust chamber 18 is to be formed, when the fluid 17 is press-fitted from the fluid supply pipe 16, The space to be the exhaust chamber 18 may undesirably extend to the thick portions 23 and 24. This is resin 13
When the material is injected into the mold cavity, the part closer to the contact surface with the mold solidifies relatively quickly, but the thicker part
This is because the solidification of the resin 13 is delayed in a portion far from such a contact surface, such as the central portion in the thickness direction of 23 and 24, and the press-fitted fluid 17 may be allowed to enter.

In order to solve such a problem, as shown in FIG. 7, the mold is formed so that the thin portions are formed in the portions 23 and 24 connected to the portion where the space to be the exhaust chamber 18 is formed. It should be designed. In this way, when the thin portion is formed, the solidification of the resin 13 proceeds relatively quickly in the entire thickness direction, and even if the fluid 17 is press-fitted from the fluid supply pipe 16, the fluid 17 is No entry into parts 23 and 24 is made.

The method as shown in FIG. 7 can be adopted as desired in other parts of the molded article 12, and by adopting this method, it is useful to obtain the exhaust chamber 18 having a desired shape. Can be made.

FIG. 8 and FIG. 9 show a fifth embodiment of the present invention. FIG. 8 is a cross-sectional view corresponding to FIG. 2 described above, and FIG. 9 is a cross-sectional view corresponding to FIG. 3 described above.

In the embodiment shown in FIG. 8 and FIG. 9, the one corresponding to the exhaust pipe 20 is not formed. As shown in FIG. 8, the molded product 12 is injection-molded with the resin 13 while the fluid 17 is being press-fitted through the fluid supply pipe 16. Next, after the injection molding is completed, as shown in FIG. 9, except for the exhaust hole 19 (c) formed as a result of the insertion of the fluid supply pipe 16, the exhaust hole 19 is formed. Holes are formed by processing. Also, since the gas is pierced through the exhaust pipe 21, drilling is performed later.

In FIGS. 8 and 9, parts corresponding to the parts shown in FIGS.
The same reference numerals are given and duplicate explanations are omitted.

FIGS. 10 and 11 show a sixth embodiment of the present invention. FIG. 10 is a sectional view corresponding to FIG. 2 described above, and FIG. 11 is a sectional view corresponding to FIG. 3 described above.

As shown in FIG. 10, the sixth embodiment employs a resin flow path.
Fluid supply pipe 16b is introduced into 14b, and resin 13 and fluid 17 are introduced.
Are supplied to the cavity of the mold through the common gate 15b. The other parts are substantially the same as those shown in FIG. 2, and therefore, the corresponding parts are denoted by the same reference characters and overlapping description will be omitted.

As shown in FIG. 10, after the injection molding of the molded article 12 is completed, the resin 13 in the resin flow path 14b is cut off at the gate 15b as shown by the broken line in FIG. Thereby, the exhaust hole 19 provided in the exhaust pipe 20 (d) is provided.
(D) is in a penetrating state. Drilling is performed on the other exhaust pipes 20 and the exhaust pipes 21 so that the exhaust holes 19 are made to penetrate, and
21 is also penetrated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view corresponding to a cross-sectional view taken along line XIV-XIV of FIG. 12, showing a molded article 12 to be a lid obtained according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the molded product 12 of FIG. 1 and corresponding to a cross-sectional view taken along line XIII-XIII of FIG. FIG. 3 is a sectional view corresponding to FIG. 2 and showing a lid 12a obtained from the molded product 12 shown in FIGS. 1 and 2. FIG. 4 is a sectional view, corresponding to FIG. 2, showing a molded article 12 obtained according to the second embodiment of the present invention. FIG. 5 is a sectional view, corresponding to FIG. 2, showing a molded article 12 obtained by the third embodiment of the present invention. FIG. 6 is a view showing a part of a cross section corresponding to the cross section shown in FIG. 1 for explaining the background on which the fourth embodiment of the present invention was born. FIG. 7 is a view showing a part of a cross section corresponding to the cross section shown in FIG. 1, showing a molded product 12 obtained by the fourth embodiment of the present invention. FIG. 8 is a sectional view corresponding to FIG. 2 showing a fifth embodiment of the present invention. FIG. 9 is a sectional view corresponding to FIG. 3 showing a fifth embodiment of the present invention. FIG. 10 is a sectional view corresponding to FIG. 2 showing a sixth embodiment of the present invention. FIG. 11 is a sectional view corresponding to FIG. 3 showing a sixth embodiment of the present invention. FIG. 12 is a partially exploded perspective view showing a cover 1 of a conventional storage battery. FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. FIG. 14 is a sectional view taken along the line XIV-XIV in FIG. In the figure, 2 is a compartment, 3 is a battery case main body, 12 is a molded article to be a lid, 12a is a lid, 13 is a resin, 14, 14b are resin flow paths, 15,
15b is a gate, 16, 16a and 16b are fluid supply pipes, 17 is a fluid, 18 is an exhaust chamber, 19 is an exhaust hole, and 21 is an exhaust pipe.

Claims (3)

(57) [Claims] A plurality of exhaust cylinders having an exhaust hole extending downward, an exhaust chamber formed above the exhaust hole and commonly communicating with each of the exhaust holes, and extending downward from the exhaust chamber. And an exhaust pipe formed in such a manner as to communicate with the exhaust chamber, comprising the steps of: injecting a resin into a mold; and injecting the resin into the mold before solidification. Forming a space to be the exhaust chamber so as to extend into the exhaust pipe and the exhaust pipe by press-fitting an inert fluid to the resin into the resin. A method for manufacturing a storage battery lid. 2. The method according to claim 1, wherein the fluid is introduced into the resin from a plurality of locations through a pipe having a branch pipe. 3. The method according to claim 1, wherein the shape of the mold is adjusted so that a portion connected to a portion where a space to be the exhaust chamber is formed is a thin portion.