JPH0590813U - Sealed lead acid battery - Google Patents

Abstract

(57) [Summary] [Purpose] In a sealed lead-acid battery in which a lead bushing is embedded in the battery case lid, the boundary surface between the battery case lid and the bushing is not applied with an adhesive to maintain the airtightness of the interface. Prevents dilute sulfuric acid from seeping out. A lead bushing 2 is embedded in a raised portion of a battery case lid 1, and an annular groove 7 is provided on the upper surface of the boundary surface between the battery case lid 1 and the bushing 2. Then, the O-ring 8 is fitted in the annular groove 7, and the O-ring 8 is pressed from above by the cap nut 9. The cap nut 9 is screwed onto the outer circumference of the raised portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a sealed lead-acid battery, and more particularly to an improvement of a terminal sealing portion.

[0002]

[Prior Art]

 The terminal sealing portion of the sealed lead storage battery has a structure as shown in FIG. That is, the pole post 3 is passed through the lead bushing 2 embedded in the upper surface of the battery case lid 1, and the bushing 2, the pole post 3, and the terminal 4 are integrally welded at the upper part of the bushing 2. 5 shows the additional lead used for welding. Then, an adhesive 6 is applied to the boundary surface with the bushing 2 on the upper surface of the battery case lid 1 to keep airtightness and prevent dilute sulfuric acid as an electrolytic solution from seeping out from the boundary. There is.

[0003]

[Problems to be solved by the device]

 The above-mentioned technique requires a step of mixing the base material and the curing agent when applying the adhesive, filling the mixture, and then heating and curing. The problem to be solved by the present invention is that a lead bushing is embedded in the battery case lid, and no adhesive is applied to the interface between the battery case lid and the bushing. It is to prevent the sulfuric acid from seeping out.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the sealed lead-acid battery according to the present invention has a pole bush inserted through a lead bushing embedded in the upper surface of the battery case lid, and the bushing, the pole pole, and the terminal are integrally welded at the top of the bushing. In the sealed lead-acid battery described above, an annular groove is provided on the boundary surface between the battery case lid and the bushing on the upper surface, and an O-ring is fitted in this groove and pressed from above.

[0005]

With the above structure, the O-ring is brought into close contact with the boundary surface between the battery case lid and the bushing, the airtightness of the boundary surface can be maintained, and the bleeding of dilute sulfuric acid from the boundary surface can be prevented.

[0006]

【Example】

 An embodiment according to the present invention will be described with reference to FIG. The pole 3 is passed through the lead bushing 2 embedded in the upper surface of the battery case lid 1, and the bushing 2 and the pole 3 (which are connected to the electrode plate) and the terminal 4 are integrally welded at the upper part of the bushing 2. ing. 5 shows the additional lead used for welding. The portion of the battery case lid 1 in which the lead bushing is embedded is raised, and an annular groove 7 is provided on the upper surface of the boundary surface between the battery case lid and the bushing. Then, the O-ring 8 is fitted in the annular groove 7, and the O-ring 8 is pressed from above by the cap nut 9. The cap nut 9 is screwed into a male screw provided on the outer circumference of the rising portion of the battery case lid in which the lead bushing is embedded, and thereby a force for pressing the O-ring 8 from above is obtained. Since the O-ring 8 is in close contact with the boundary surface between the battery case lid and the bushing, the boundary surface can be kept airtight and dilute sulfuric acid can be prevented from seeping out from the boundary surface.

[0007]

[Effect of the device]

 As described above, in the sealed lead-acid battery according to the present invention, the boundary between the battery case lid and the lead bushing can be sealed without using an adhesive. When an adhesive is used, heating time is required to cure it, but it is not necessary in the sealed lead acid battery according to the present invention. In addition, when an adhesive is used, an organic solvent is required, which requires safety and hygiene considerations, but in the case of the present invention, there is no such concern.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a sealed lead-acid battery according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a conventional sealed lead-acid battery.

[Explanation of symbols]

 1 is a battery case lid 2 is a bushing 3 is a pole post 4 is a terminal 5 is a lead 7 is an annular groove 8 is an O-ring 9 is a cap nut

Claims (1)

[Scope of utility model registration request] 1. A sealed lead-acid battery in which a pole pillar is passed through a lead bushing embedded in the upper surface of a battery case lid, and the bushing, the pole pillar, and a terminal are integrally welded at the upper part of the bushing. An annular groove is provided on the boundary surface of the bushing,
A sealed lead-acid battery characterized in that an O-ring is fitted in this groove and pressed from above.