JP4626027B2 - Lead-acid battery and manufacturing method thereof - Google Patents

Description

【００２４】
この表１に示す結果より、本発明の一実施例では従来例に比較して、気密，液密に及ぼす影響が極めて少ないことがわかる。
【００２５】
なお、本発明の一実施例においては、Ｏリング状弾性シール体１１とパッキン状弾性シール体１３とが２ヶ所に備えられた例を示したが、弾性シール体の取り付け数が多くかつ面積も大きいほど、樹脂製ブッシング７と樹脂製蓋８との面における密封保持効果が高い。
【００２６】
【発明の効果】
以上の説明で明らかなように本発明においては金属製ブッシングの外周に密着して形成した樹脂製ブッシングの外周と底部とに環状凹部を形成し、この環状凹部に対応する環状凹部を樹脂製蓋にも設け、前記環状凹部同士で構成される環状溝部に弾性体物質の弾性シール体を圧入して、この弾性シール体によって樹脂製ブッシングと樹脂製蓋とが気密かつ液密に密着するので電解液が漏出したり、電池内気体が漏出することがなく、その効果を簡単な構成と製造方法によって達成し、所期の目的を達成することができる。
【図面の簡単な説明】
【図１】本発明の一実施例における鉛蓄電池端子部の断面図
【図２】ヒートショック試験の条件を示す図
【図３】（ａ）従来の接着剤方式における鉛蓄電池端子部の断面図
（ｂ）従来のダブル・インジェクション方式における鉛蓄電池端子部の断面図
【符号の説明】
２，８ 樹脂製蓋
３，６ 金属製ブッシング
４ 接着剤層
５，７ 樹脂製ブッシング
９ 透孔
１０，１０ａ 側部環状凹部
１１ Ｏリング状弾性シール体
１２，１２ａ 底部環状凹部
１３ パッキン状弾性シール体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead storage battery in which a space between a metal bushing in close contact with a pole of the lead storage battery and a through hole of a resin lid is airtight and liquid-tight, and a method for manufacturing the lead storage battery.
[0002]
[Prior art]
In order to ensure the airtightness between the lid and the metal terminal, the conventional lead storage battery generally has an airtight structure by a resin adhesive and an airtight structure by a double injection molding using a resin bushing. .
[0003]
Hereinafter, both the configurations will be described with reference to FIG.
[0004]
In FIG. 3, reference numeral 1 denotes a pole column made of a lead alloy, which is inserted into an opening 3a of a metal bushing 3 serving as a terminal protruding from the opening of the resin lid 2, and is in close contact with the metal bushing 3 by burner welding. It is comprised integrally as follows.
[0005]
The resin lid 2 is thermally welded to the upper rim of a battery case that houses battery elements such as a positive electrode, a negative electrode, a separator, and an electrolytic solution. The resin lid 2 and the metal bushing 3 In order to seal the gap between them, there are a configuration of resin adhesive sealing shown in FIG. 3 (a) and a configuration using a resin bushing shown in FIG. 3 (b).
[0006]
That is, in FIG. 3A, reference numeral 4 denotes an adhesive layer such as an epoxy resin filled in a gap between the metal bushing 3 protruding from the opening of the resin lid 2 and the opening of the resin lid 2. Thus, the metal bushing 3 and the resin lid 2 are firmly bonded by the adhesive layer 4, and the electrolytic solution in the battery case does not leak from between the metal bushing 3 and the resin lid 2.
[0007]
Further, 5 shown in FIG. 3B is a resin bushing, which is formed on the outer periphery of the metal bushing 3 in an airtight and liquid tight manner by a double injection method.
[0008]
The outer periphery of the resin bushing 5 and the opening of the resin lid 2 are firmly fixed to each other by welding 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]
[Problems to be solved by the invention]
However, according to the adhesive method shown in FIG. 3 (a), the shrinkage rates of the metal bushing 3, the resin lid 2, and the adhesive layer 4, etc. are different from each other. Use of a storage battery causes gaps and cracks due to material distortion. This is due to the difference in shrinkage of individual materials and the pressure inside the storage battery. When a gap or the like occurs, the sulfuric acid content in the storage battery leaks from the pole 1 through the gap between the metal bushing 3, the adhesive layer 4 and the resin lid 2, and the battery terminal is corroded by sulfuric acid. Specifically, the terminal wired with the terminal may be disconnected by sulfuric acid. In addition, there is concern about airtightness with the outside, and in the event of an extreme gas leakage, acceleration of oxidation of electrode plates, shelf welds, etc. is caused, and the electrolyte specific gravity is increased by evaporation of moisture inside the battery, thereby It is expected that the electrode plate life, that is, the battery life will be shortened. In order to solve the above-described problems, a terminal structure using a double injection method in which a portion where the resin bushing 5 and the resin lid 2 are in contact with each other as shown in FIG. However, when this means is used, the double injection method in which both the resin lid 2 and the resin bushing 5 are injection-molded is used, so that there is a problem that the equipment and the man-hour are very expensive.
[0010]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such problems, and to provide a lead storage battery that is suitable for preventing liquid-tight and air-tight defects in the storage battery terminal portion, and that can constitute a sealed structure of the terminal portion at low cost, and a method for manufacturing the same. It is what.
[0011]
[Means for Solving the Problems]
According to the present invention, as a means for achieving the above-mentioned 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 outer periphery and bottom portion of the resin bushing are formed. An annular recess is provided at a position corresponding to the annular recess of the resin bushing on the resin lid that forms an annular recess, and the resin bushing is in close contact with the resin bushing. The resin bushing is mounted in an airtight and liquid-tight manner on the resin lid by press-fitting an elastic seal member made of an elastic material into an annular groove formed by an annular recess. .
[0012]
As a result, the elastic bushing is compressed by bringing a resin bushing having an elastic seal body such as an O-ring or packing into close contact with the resin lid, and is completely sealed by the compressed elastic seal body. In addition, the structure is opposed so that an elastic seal body such as an O-ring or packing enters the annular recess of the resin bushing and the resin lid, thereby preventing mounting displacement of the elastic seal body such as an O-ring and packing. . As a result, material shrinkage and expansion can be prevented by expansion and contraction, which is a characteristic of an elastic seal body, even in the heat and thermal shock atmosphere temperature during welding of metal bushings and poles. it can.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the resin bushing is molded so as to be in close contact with the metal bushing, but the annular recess formed on the outer periphery and the bottom of the resin bushing may be formed simultaneously with the resin bushing molding, Alternatively, the annular recess may be formed by processing after molding a resin bushing having a smooth surface.
[0014]
In addition, since the resin bushing and the resin lid are in close contact with each other, it is preferable to use the same resin having the same expansion coefficient and the like, and since the electrolyte is sulfuric acid, the electrolyte is resistant to sulfuric acid. It is desirable to select a compatible resin.
[0015]
In addition, the elastic seal body that is press-fitted into the groove portion formed by the annular groove portion of the resin bushing and the annular recess portion of the resin lid has a large elasticity for expansion and contraction, and a material having sulfuric acid resistance should be selected. Is preferred.
[0016]
【Example】
An embodiment of the present invention will be described below with reference to FIG.
[0017]
First, a resin bushing 7 made of polypropylene is formed on the outer periphery of a metal bushing 6 made of lead alloy serving as an output terminal to the outside. The resin bushing 7 is attached to a through hole 9 formed in a resin lid 8 made of polypropylene. A side annular recess 10 is formed on the outer periphery of the resin bushing 7 by machining. A side annular recess 10a corresponding to the side annular recess 10 is formed in the resin lid 8, and an O-ring elastic seal made of neoprene rubber is formed in an annular groove formed by the side annular recesses 10 and 10a. The body 11 is press-fitted.
[0018]
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 in a state where a part thereof is fitted in the side annular recess 10 of the resin bushing 7. The other part is press-fitted into the side annular recess 10a. As a result, the O-ring elastic seal body 11 is press-fitted into the annular groove formed by the side annular recesses 10 and 10a, and the elasticity of the O-ring elastic seal body 11 causes the resin bushing 7 side. The part is in airtight and liquid tight contact with the resin lid 8.
[0019]
Similarly, a packing-like elastic seal body 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 12 a provided at the bottom of the resin lid 8. The bottom portion of the resin bushing 7 and the bottom portion of the resin lid 8 are in airtight and liquid tight contact.
[0020]
The O-ring-like elastic seal body 11 and the packing-like elastic seal body 13 are in a state where the compression state does not change when sealed between the resin bushing 7 and the resin lid 8 and is applied to the inside of the battery. Even at the maximum value of pressure, the elastic sealing body is not deformed, and therefore no gas or liquid leaks to the outside.
[0021]
Further, when the O-ring elastic seal body 11 and the packing elastic seal body 13 are not compressed at a predetermined position, the resin bushing 7 cannot be attached to the resin lid 8, and the above two If the elastic seal bodies 11 and 13 are mounted at predetermined positions, the resin bushing 7 cannot be easily removed from the resin lid 8. Next, in battery assembly, the resin lid 8 and a battery case (not shown) made of polypropylene are thermally welded, and the pole column 14 made of lead alloy is inserted into the opening of the metal bushing 6. Each is joined by burner welding.
[0022]
Next, under the conditions shown in FIG. 2 in the one embodiment of the present invention and the conventional example (double injection method) shown in FIG. 3B, a 300-cycle heat shock test: low temperature −40 ° C., Table 1 shows the effects of airtightness and liquid tightness on a 2-hour alternating cycle at a high temperature of 65 ° C. Specification 1 represents a sealed lead-acid battery of this embodiment, and specification 2 represents a conventional open battery for starting an automobile. The number of tests is 1,000.
[0023]
[Table 1]

[0024]
From the results shown in Table 1, it can be seen that in one embodiment of the present invention, the influence on airtightness and liquid tightness is extremely small as compared with the conventional example.
[0025]
In the embodiment of the present invention, an example in which the O-ring elastic seal body 11 and the packing elastic seal body 13 are provided at two locations is shown. However, the number of elastic seal bodies is large and the area is also large. The larger the size, the higher the sealing retention effect on the surfaces of the resin bushing 7 and the resin lid 8.
[0026]
【The invention's effect】
As is apparent from the above description, in the present invention, an annular recess is formed in the outer periphery and 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 made of a resin lid An elastic seal body made of an elastic material is press-fitted into an annular groove formed by the annular recesses, and the resin bushing and the resin lid are in airtight and liquid tight contact with the elastic seal body. The liquid does not leak and the gas in the battery does not leak, and the effect can be achieved by a simple configuration and manufacturing method, and the intended purpose can be achieved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a lead storage battery terminal portion according to an embodiment of the present invention. FIG. 2 is a view showing conditions of a heat shock test. FIG. (B) Cross-sectional view of lead-acid battery terminal in conventional double injection method [Explanation of symbols]
2,8 Resin lid 3, 6 Metal bushing 4 Adhesive layers 5, 7 Resin bushing 9 Through hole 10, 10a Side annular recess 11 O-ring elastic seal body 12, 12a Bottom annular recess 13 Packing elastic seal body

Claims (2)

A resin lid for covering the battery case; a metal bushing in close contact with the pole pole; and a resin bushing formed in close contact with the outer periphery of the metal bushing; An annular recess is formed in the bottom, and the resin lid to which the resin bushing is in close contact is provided with an annular recess at a position corresponding to the annular recess of the resin bushing. The annular recess of the resin bushing and the resin A lead characterized in that an elastic seal body made of an elastic material is press-fitted into an annular groove portion formed by an annular recess portion of the lid, and the resin bushing is attached to the resin lid in an airtight and liquid-tight manner. Storage battery. When a resin bushing having an annular recess at the outer periphery and the bottom is formed in close contact with the outer periphery of a metal bushing that is in close contact with the pole, and the resin bushing is fitted into the through hole of the resin lid, 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 material is fitted in the annular recess of the resin bushing. A bushing is fitted into the through hole of the resin lid, and the elastic seal body is positioned in a compressed state in an annular groove formed by the annular recess of the resin bushing and the annular recess of the resin lid, A method for producing a lead-acid battery, wherein the resin bushing is airtightly and liquid-tightly attached to the through hole of the resin lid by an elastic sealing body.

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