JPH0733381Y2 - Lead acid battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a lead acid battery, and more particularly to a configuration in which an electrolyte solution level detection device can be reliably attached to a lead acid battery.

2. Description of the Related Art Electrolyte solution level detection device mounted on a small lead-acid battery such as a lead-acid battery for a motorcycle has a lead wire attached to the upper part of an electrode rod, and the attached portion is covered with the electrode rod. A part of the lower end of which is exposed and covered with a thermoplastic synthetic resin by the injection molding method, and the thermoplastic resin portion is inserted and fixed in the electrolytic solution level detecting device insertion hole of the lid.

However, since the material of the lid of the lead acid battery as described above is polypropylene and the thermoplastic synthetic resin is polypropylene containing butadiene, when the electrolyte level detector is attached to the lid and a heat cycle test is performed, The resin sometimes softened and came off. In order to prevent such slip-out, it is possible to apply a slip-prevention process to the top surface of the lid, but the mold of the lid has vertical and horizontal water holes for cooling the mold. There was a drawback that the mold could not be used.

The purpose of the present invention is to solve the above-mentioned drawbacks by mounting a cylindrical body in the electrolytic solution level detecting device insertion hole of the lid that can be molded using the existing mold, and by using this cylindrical body and the electrolytic solution level detecting device. The purpose is to prevent the omission during the heat cycle test by fitting.

The lead-acid battery of the present invention is provided with a hole for inserting a liquid electrolyte level detection device in the lid, and a cylinder is attached below the hole, and a protrusion directed inward is provided on a part of the inner surface of the cylinder. The protrusion is provided and the concave portion provided on the side portion of the electrolytic solution surface detecting device to be inserted into the hole is fitted and stored.

Examples Hereinafter, examples will be described. FIG. 1 is a cross-sectional view of a main part when an electrolyte solution detecting device is mounted on a lead acid battery of the present invention, in which a polypropylene battery case 1 and a lid 2 are heat-welded and bonded at a bonding portion 3. Reference numeral 4 denotes a hole for inserting an electrolytic solution level detecting device, which is provided in the lid 2 and has a flat inner surface, which has a sleeve 5 and in some cases may have an inverted V-shaped taper. 6 is an electrolytic solution, 7 is a minimum liquid level line, and 8 is a maximum liquid level line. The electrolytic solution level detecting device inserted into the electrolytic solution level detecting device insertion hole 4 is 9, and a lead wire 12 is attached to an upper portion 11 of an electrode rod 10 made of lead or a lead alloy, and an external harness terminal is provided at a tip thereof. A connector 13 for electrical connection is attached. Reference numeral 14 denotes a thermoplastic synthetic resin such as polypropylene containing butadiene which covers the electrode rod 10 made of the lead or lead alloy by exposing a part 17 of the lower end thereof by an injection molding method, and a portion 15 between the lid 2 and the sleeve 5. A material that easily retains adhesion is selected. Such a side portion of the electrolytic solution level detection device 9,
That is, the side wall of the thermoplastic synthetic resin 14 has a cylindrical body to be described later.
A recess 16 that fits into the projection 19 of 18 is provided. A part 17 of the lower end of the electrode rod 10 is configured so that its tip is located near the lowest liquid level line 7.

Next, a lead storage battery to which the above-described electrolytic solution level detection device 9 is attached will be described. A tubular body 18 is mounted below the electrolyte solution level detection device insertion hole 4 of the lid 2, and an inward projection 19 is provided at a part of the tubular body 18, for example, a lower end thereof, and the projection 18 is inserted through the device insertion hole 4. When the device 9 is inserted, the height H is determined so that the device 9 is fitted into the concave portion 16 provided on the side portion of the electrolytic solution surface detecting device 9. FIG. 2 is a cross-sectional view of the AA ′ portion in FIG. 1, and FIG. 3 is a perspective view of the cylindrical body 18. In each figure, the cylinder
Slits 20a and 20b are provided in 18, and a step portion 21 that abuts on the outer circumference of the sleeve 5 is provided inside the upper portion.

In the above-described embodiment, the projection 19 and the recess 16 are fitted together, but it goes without saying that the shape is not limited as long as it acts as a stopper.

Effect of the Invention As described in detail in the embodiments, the lead-acid battery of the present invention requires only a cylindrical body attached to a lid that can be molded using an existing mold, and does not require manufacturing cost. Further, since the dedicated electrolyte solution level detecting device can be securely fixed only by inserting it into the hole, the mounting work of the device becomes simple and the device does not fall out from the lid.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of the lead-acid battery of the present invention when an electrolyte solution detecting device is mounted, FIG. 2 is a cross-sectional view of AA ′ part of FIG. 1, and FIG. It is a perspective view. 2 ... Lid, 4 ... Hole for inserting electrolyte level detector 5 ... Sleeve, 9 ... Electrolyte level detector 10 ... Electrode rod, 14 ... Thermoplastic synthetic resin 16 ... Recess, 18 ... Cylindrical body 19 …… Protrusion, 21 …… Step portion

Claims (1)

[Scope of utility model registration request] 1. A lead-acid battery having a lid (2) and an electrolyte solution level detection device (9), wherein the lid (2) comprises an electrolyte solution level detection device insertion hole (4) and a cylinder ( 18), the liquid level detection device (9) has a recess (16) on a side, and the hole (4) has a flat inner surface. (18) is a protrusion (1
9) and is mounted below the hole (4), the liquid level detection device (9) is inserted into the hole (4), and the recess (16) is the protrusion. Lead acid battery characterized by being fitted with (4).