JP2002050327A - Lead storage battery and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost sealing structure suited for a storage battery and a manufacturing method of the storage battery which can reduce the number of man-hour as well as material cost with an improved airtightness and liquid-tightness of an outer periphery of a terminal part. SOLUTION: Circular concaves 10, 12 are formed at an outer periphery or a bottom of a resin bushing 7 airtightly molded to an outer periphery of a metal bushing 6, and circular recesses 10a, 12a corresponding to the circular concaves 10, 12 are formed on a resin lid 8 when mounted, and then, elastic sealing bodies 11, 13 of an elastic material are press fitted into circular grooves composed of the above sets of circular concaves and circular recesses 10 and 10a, 12 and 12a, and these elastic sealing bodies 11, 13 bond the resin bushing 7 and the resin lid 8 in airtightness and liquid tightness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-acid battery in which the space between a metal bushing in close contact with the pole of a lead-acid battery and a through hole of a resin lid is made airtight and liquid-tight, and a method for producing the same.

[0002]

2. Description of the Related Art Conventional lead-acid batteries generally have a hermetic structure using a resin adhesive and a hermetic structure using double injection molding using a resin bushing in order to ensure airtightness between a lid and metal terminals. Had been done.

[0003] The two components will be described below with reference to FIG.

[0004] In FIG. 3, reference numeral 1 denotes a pole made of a lead alloy, which is inserted into an opening 3 a of a metal bushing 3 serving as a terminal protruding from the opening of the resin lid 2 and burner-welded to the metal bushing 3. It is integrally formed so as to be in close contact with.

The resin lid 2 is thermally welded to the upper rim of a battery case for accommodating battery elements such as a positive electrode, a negative electrode, a separator and an electrolytic solution. 3 (a) to seal the gap between
And a configuration using a resin bushing shown in FIG. 3B.

That is, in FIG. 3A, reference numeral 4 denotes an adhesive such as an epoxy resin filled in a gap between the metal bushing 3 projecting from the opening of the resin lid 2 and the opening of the resin lid 2. The metal bushing 3 and the resin lid 2 are firmly bonded to each other by the adhesive layer 4, and the electrolyte in the battery case leaks from between the metal bushing 3 and the resin lid 2. There is no.

In FIG. 3B, reference numeral 5 denotes a resin bushing, which is formed on the outer periphery of the metal bushing 3 in a gas-tight and liquid-tight manner by a double injection method.

The outer periphery of the resin bushing 5 and the opening of the resin lid 2 are firmly fixed by welding and joining the resins. Therefore, the electrolyte in the battery case does not leak from between the metal bushing 3 and the resin bushing 5 and between the resin bushing 5 and the opening of the resin lid 2.

[0009]

SUMMARY OF THE INVENTION However, FIG.
According to the adhesive method shown in the above, since the shrinkage rates of the metal bushing 3, the resin lid 2, and the adhesive layer 4 are different from each other, when the storage battery is used in an environment with severe temperature conditions, the gap due to the material distortion is generated. And cracks occur. This is due to the difference in shrinkage of each material and the pressure inside the storage battery. When a gap or the like is generated, the sulfuric acid in the storage battery leaks from the pole 1 to the outside through the gap between the metal bushing 3 and the adhesive layer 4 and the resin lid 2, and the battery terminal is corroded by the sulfuric acid. Specifically, the terminal connected to the terminal may be disconnected by sulfuric acid. In addition, there is a concern about airtightness with the outside. In the case of extreme gas leakage, the oxidation of the electrode plate and the welded portion of the shelf may be accelerated, or the specific gravity of the electrolytic solution may be increased by evaporating the water inside the battery. Is expected to shorten the life of the electrode plate, that is, the life of the battery. In order to solve the above-mentioned problem, recently, a resin bushing 5 shown in FIG.
To weld the part where the resin lid 2 contacts
A terminal structure using an injection method has been implemented. In this case, however, a double molding method in which both the resin lid 2 and the resin bushing 5 are injection-molded.
Since the injection method is used, there is a problem that the equipment and the man-hour are very expensive.

The present invention solves the above-mentioned problems, and provides a lead-acid battery suitable for preventing poor liquid-tightness and air-tightness in a battery terminal, and capable of forming an inexpensive closed structure of the terminal, and a method of manufacturing the same. The purpose is to do so.

[0011]

According to the present invention, as a means for achieving the above object, a resin bushing is formed in close contact with an outer peripheral portion of a metal bushing attached to a through hole of a resin lid, and the resin is formed. An annular concave portion is formed at an outer peripheral portion and a bottom portion of the bushing, and the resin lid to which the resin bushing is in close contact is provided with an annular concave portion at a position corresponding to the annular concave portion of the resin bushing; The resin bushing is hermetically and liquid-tightly sealed in the resin lid by press-fitting an elastic seal made of an elastic substance into an annular groove formed by the annular concave portion and the annular concave portion of the resin lid. It is to be attached to.

[0012] Thus, the resin-made bushing having an elastic seal such as an O-ring or a packing is brought into close contact with the resin lid, whereby the elastic seal is compressed, and a state in which the elastic seal is completely sealed by the compressed elastic seal is obtained. Become.
Also, the elastic seals such as O-rings or packings are opposed to each other so that the elastic seals such as O-rings or packing enter the annular recesses of the resin bushing and the resin cover, thereby preventing the mounting of the elastic seals such as O-rings and packing. . As a result, material shrinkage and expansion can be prevented by the expansion and shrinkage characteristics of the elastic seal body, even when the metal bushing and the pole are welded at the heat or thermal shock atmosphere temperature. it can.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a resin bushing is formed so as to be in close contact with a metal bushing. The annular recess formed on the outer periphery and the bottom of the resin bushing is formed at the same time as the resin bushing is formed. The annular concave portion may be formed, or after forming a resin bushing having a smooth surface, an annular concave portion may be formed by processing.

Since the resin bushing and the resin lid come into close contact with each other, it is preferable to use the same resin having the same coefficient of expansion and the like. It is desirable to select a sulfuric acid resistant resin.

The elastic seal body press-fitted into the groove formed by the annular groove of the resin bushing and the annular recess of the resin lid has high elasticity of expansion and contraction and is made of a material having sulfuric acid resistance. It is preferable to select.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

First, a resin bushing 7 made of polypropylene is formed on an outer peripheral portion of a metal bushing 6 made of a lead alloy, which serves as an output terminal to the outside. The resin bushing 7 is mounted in a through hole 9 formed in a resin lid 8 made of polypropylene. A side annular concave portion 10 is formed on the outer periphery of the resin bushing 7 by processing. And a side annular recess 10a corresponding to the side annular recess 10.
Is formed on the resin lid 8, and the side annular concave portions 10 and 10a are formed.
The O-ring-shaped elastic seal body 11 made of neoprene (registered trademark) rubber is press-fitted into the annular groove formed by the above.

The O-ring-shaped elastic seal body 11 is formed by press-fitting the resin bushing 7 into the through hole 9 of the resin lid 8 with a part of the O-ring elastic seal body 11 fitted in the side annular concave portion 10 of the resin bushing 7. Another portion is press-fitted into the side annular concave portion 10a of the resin lid 8. As a result, the side annular recesses 10 and 10
The O-ring-shaped elastic seal body 11 is press-fitted into the annular groove formed by the a. The side of the resin bushing 7 is hermetically sealed with the resin lid 8 by the elasticity of the O-ring elastic seal body 11. It will be in liquid tight contact.

Similarly, a packing-like elastic seal 13 is press-fitted into an annular groove formed by a bottom annular recess 12 provided at the bottom of the resin bushing 7 and a bottom annular recess 12a provided at the bottom of the resin lid 8. By doing so, the bottom of the resin bushing 7 and the bottom of the resin lid 8 are air-tightly and liquid-tightly adhered.

Note that the O-ring-shaped elastic seal body 11 and the packing-like elastic seal body 13 are in a state in which the compressed state does not change when they are sealed between the resin bushing 7 and the resin lid 8. Even at the maximum value of the pressure applied to the inside, the elastic seal body is not deformed, so that gas or liquid does not leak to the outside.

When the O-ring-shaped elastic seal body 11 and the packing-like elastic seal body 13 are not properly compressed at predetermined positions, the resin bushing 7 cannot be mounted on the resin lid 8, and If the two elastic seals 11 and 13 are mounted at predetermined positions, it is not easy to remove the resin bushing 7 from the resin lid 8. Next, in assembling the battery, thermal welding is performed between the resin lid 8 and a battery case (not shown) made of polypropylene, and the pole 14 made of a lead alloy is inserted into the opening of the metal bushing 6. , And each is joined by burner welding.

Next, the above-mentioned embodiment of the present invention and a conventional example shown in FIG. 3B (double injection system).
Table 1 shows the effects of air-tightness and liquid-tightness on a 2-hour alternating cycle of a low-temperature -40 ° C and a high-temperature 65 ° C under the conditions shown in FIG. Specification 1 represents a sealed lead-acid battery of this embodiment, and specification 2 represents a conventional open-type battery for starting a vehicle. The number of tests is 1,000.

[0023]

[Table 1]

From the results shown in Table 1, it can be seen that the effect of the embodiment of the present invention on airtightness and liquid tightness is extremely small as compared with the conventional example.

In one embodiment of the present invention, the O-ring-shaped elastic seal body 11 and the packing-like elastic seal body 13 are used.
Although the example in which these are provided at two locations is shown, the greater the number of elastic seals attached and the larger the area, the higher the effect of holding and sealing the surfaces of the resin bushing 7 and the resin lid 8.

[0026]

As is apparent from the above description, in the present invention, an annular recess is formed in the outer periphery and the bottom of the resin bushing formed in close contact with the outer periphery of the metal bushing, and the annular recess corresponding to the annular recess is formed. A recess is also provided in the resin lid, and an elastic seal made of an elastic substance is press-fitted into an annular groove formed by the annular recesses, whereby the resin bushing and the resin lid are air-tight and liquid-tight. Because it adheres to the electrolyte, the electrolyte does not leak or the gas in the battery does not leak, and the effect is achieved by a simple configuration and manufacturing method.
The intended purpose can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lead-acid battery terminal according to an embodiment of the present invention.

FIG. 2 is a diagram showing conditions of a heat shock test.

FIG. 3A is a cross-sectional view of a lead-acid battery terminal in a conventional adhesive method. FIG. 3B is a cross-sectional view of a lead-acid battery terminal in a conventional double injection method.

[Explanation of symbols]

 2,8 Resin lid 3,6 Metal bushing 4 Adhesive layer 5,7 Resin bushing 9 Through hole 10,10a Side annular concave part 11 O-ring elastic seal body 12,12a Bottom annular concave part 13 Packing elastic seal body

Claims (2)

[Claims] 1. A resin bushing which covers a battery case, a metal bushing which is in close contact with a pole, and a resin bushing which is formed in close contact with an outer peripheral portion of the metal bushing. An annular recess is formed on the outer periphery and bottom of the bushing, and an annular recess is provided at a position corresponding to the annular recess of the resin bushing on the resin lid to which the resin bushing is in close contact. An elastic seal made of an elastic substance is press-fitted into an annular groove formed by a concave portion and an annular concave portion of the resin lid, and the resin bushing is mounted on the resin lid in a gas-tight and liquid-tight manner. A lead-acid battery characterized by the above-mentioned. 2. A resin bushing having an annular concave portion at an outer peripheral portion and a bottom portion is formed in close contact with an outer peripheral portion of a metal bushing which is in close contact with a pole, and the resin bushing is fitted into a through hole of a resin lid. When attached, an annular recess is formed in the resin lid at a position corresponding to the annular recess of the resin bushing, and an elastic seal body made of an elastic substance is fitted into the annular recess of the resin bushing. The resin sealing bushing is fitted into the through hole of the resin lid while being compressed, and the elastic seal is compressed in an annular groove formed by the annular recess of the resin bushing and the annular recess of the resin lid. And mounting the resin-made bushing in the through-hole of the resin-made lid in an air-tight and liquid-tight manner by the elastic seal body.