JP2008078053A - Lead storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead storage battery capable of surely erecting a liquid tab 5 at right angles only by inserting a cylindrical part into a liquid injection port 2a, for instance, by positioning a gravity center downward by forming a flange-shape thick part 5d at a lower part of the cylindrical part 5b of the liquid tab 5. <P>SOLUTION: In the lead storage battery with a liquid plug 5 by screwing for mounting a male screw part 5c formed at an upper part of the cylindrical part 5b protruded downward of the head part 5a into a liquid injection port 2a of a battery lid 2, a thick part 5d is formed at a lower part of the cylindrical part 5b of the liquid plug 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lead storage battery including a liquid stopper that is screwed into a liquid injection port of a battery case lid.

  An example of a conventional liquid lead acid battery for automobiles is shown in FIG. In this lead storage battery, the upper end opening of the battery case 1 is closed with a battery case cover 2. The battery case 1 has a rectangular container shape made of resin, and the inside is partitioned into six cell chambers by partition walls. The battery case lid 2 is configured to seal the inside of the battery case 1 for each cell chamber by joining the upper end opening of the battery case 1 by heat welding or the like. Moreover, the upper end part of the positive electrode terminal 3 and the negative electrode terminal 4 which consist of lead, a lead alloy, etc. which were embedded by insert molding protrudes on the upper surface of this battery case cover 2. As shown in FIG.

  The battery case lid 2 has six liquid injection ports 2a. The liquid injection port 2 a is formed with a female screw portion 2 b on the inner peripheral surface of the opening, and the depth thereof leads to the cell chamber in the battery case 1. This liquid injection port 2a is for injecting the electrolyte into the cell chamber in the battery case 1, and even when the electrolyte decreases during use of the lead storage battery, water is supplied from here. Yes.

  A liquid stopper 5 is attached to the liquid injection port 2a. The liquid stopper 5 includes a disk-shaped head portion 5a at the upper end portion, a cylindrical portion 5b projecting downward from the head portion 5a, and a male screw portion 5c formed on the upper outer periphery of the cylindrical portion 5b. On the upper surface of the head 5a, a coin groove for tightening or loosening the liquid stopper 5 and an exhaust port (not shown because it is extremely small) are formed. The cylinder part 5b is a cylindrical part whose lower end is open, and the space in the cylinder communicates with the exhaust port of the head part 5a. In addition, a splash-proof body (not shown) for preventing the electrolyte from leaking from the exhaust port of the head 5a is accommodated in the cylinder of the cylinder portion 5b. The male screw portion 5c is a portion where a male screw for screwing onto the female screw portion 2b of the liquid injection port 2a is formed.

  As shown in FIG. 5 (a), the liquid stopper 5 having the above-described configuration inserts the cylindrical part 5b into the liquid injection port 2a of the battery case lid 2, and turns the head part 5a to connect the male screw part 5c to the liquid injection port 2a. And screwed into the female thread portion 2b. Then, as shown in FIG. 5B, the liquid stopper 5 is sealed by pressing the head portion 5 a against the peripheral edge portion of the liquid injection port 2 a via the packing 6.

  However, since the liquid stopper 5 is formed in a size having a sufficient diameter and height so that the head 5a can be picked with a finger, the center of gravity is at a very high position on the head 5a side, In the state where the cylindrical part 5b as shown in FIG. 5A is inserted into the liquid injection port 2a, the stability is extremely poor, and as shown in FIG. 6, there is a high risk of tilting in the state where it is inserted into the liquid injection port 2a. There was a problem of becoming.

  If the liquid stopper 5 is inserted into the liquid injection port 2a at an angle, the screw thread 5c may be damaged when the male screw portion 5c is screwed into the female screw portion 2b. Sealing of the liquid injection port 2a by the packing 6 is insufficient. In order to prevent this, since it is necessary to straighten and support the liquid stopper 5 before screwing the male screw portion 5c, the mounting operation of the liquid stopper 5 becomes troublesome and it is difficult to automate this mounting work. Become.

Conventionally, a plurality of ribs are formed on the outer peripheral surface of the cylindrical portion 5b of the liquid stopper 5 and the ribs are guided by the tip of the thread of the female thread portion 2b of the liquid inlet 2a. An invention has been made to prevent 5 from being inclined and screwed into the liquid injection port 2a (see, for example, Patent Document 1). However, in reality, since the upper and lower lengths of the female screw portion 2b of the liquid injection port 2a are short, guiding the rib with the short female screw portion 2b ensures that the liquid stopper 5 having a very high center of gravity is secured. It was difficult to erect.
Japanese Utility Model Publication No. 8-8520

  In the present invention, by forming a thick portion at the lower portion of the cylindrical portion of the liquid stopper, the center of gravity is positioned downward, and the liquid stopper can be reliably erected simply by inserting the cylindrical portion into the liquid injection port. It is intended to provide lead-acid batteries.

  The invention according to claim 1 is a lead-acid battery comprising a liquid stopper for screwing and mounting a male screw portion formed on an upper portion of a cylindrical portion projecting downward from the head to a female screw portion of a liquid inlet of a battery case lid. A thick part is formed in the lower part of the cylindrical part of the liquid stopper.

  According to the first aspect of the present invention, since the thick wall portion is formed in the lower portion of the tube portion, the mass of this portion is increased and the gravity center of the liquid stopper is lowered downward. Therefore, when the cylindrical portion is inserted into the liquid injection port, the liquid stopper does not stand upright and tilts due to the weight of the lower thick portion, so that it can be correctly installed simply by screwing in as it is.

  The thick portion can be formed by, for example, inflating the outer peripheral surface of the lower portion of the cylindrical portion into a flange shape.

  Hereinafter, the best embodiment of the present invention will be described with reference to FIGS. In these drawings, the same reference numerals are given to constituent members having the same functions as those of the conventional example shown in FIGS.

  This embodiment demonstrates the lead acid battery similar to the prior art example shown in FIG. The configuration of the lead storage battery other than the liquid stopper 5 is the same as that of the conventional example.

  As shown in FIG. 1, the liquid stopper 5 includes a head portion 5a at the upper end, a cylindrical portion 5b projecting downward from the head portion 5a, a male screw portion 5c formed on the outer periphery of the upper portion of the cylindrical portion 5b, It consists of the thick part 5d formed in the lower outer periphery of this cylinder part 5b. As in the conventional example, the head 5a has a disk shape having a sufficient diameter and height that can be picked with a finger, and has a coin groove and an exhaust port formed on the upper surface.

  The cylindrical part 5b is a cylindrical part that protrudes downward from the lower surface of the head part 5a and that opens at the lower end, and is produced by integral molding of resin together with the head part 5a. As in the conventional example, the cylindrical portion 5b is formed with a male screw portion 5c to be screwed to the female screw portion 2b of the liquid injection port 2a of the battery case lid 2 on the upper outer periphery. It passes through the inside of the part 5c and leads to the exhaust port of the head part 5a.

  In the cylinder of the cylinder part 5b, a splash-proof body for preventing the electrolyte from leaking from the exhaust port of the head part 5a is accommodated. The splash-proof body is a resin-molded part that closes the opening hole at the lower end of the cylindrical portion 5b and partitions the space inside the cylinder above it in a maze shape, and is inserted and assembled from the opening hole at the lower end of the cylindrical portion 5b. It has become. Therefore, even if the electrolyte in the cell chamber enters through a slit or the like formed on the side surface of the cylindrical portion 5b, it is not easily leaked from the exhaust port of the liquid injection port 2a by being blocked by the maze of the splash-proof body. become. However, gas generated in the cell chamber enters the cylinder through a slit or the like formed on the side surface of the cylinder portion 5b, passes through the maze of the splash-proof body, and is easily discharged from the exhaust port of the head 5a.

  The thick part 5d at the lower part of the cylindrical part 5b is obtained by projecting the outer peripheral diameter of the lower part of the cylindrical part 5b into a flange shape, and is integrally formed with the cylindrical part 5b when the liquid stopper 5 is molded with resin. . The inner diameter of the thick part 5d in the cylindrical part 5b is the same as the inner diameter of the central part of the cylindrical part 5b in order to insert the splash-proof body. Moreover, since the outer diameter of the thick part 5d is inserted into the liquid injection port 2a of the battery case lid 2, it is formed slightly smaller than the screw inner diameter of the female screw part 2b. However, since the outer diameter of the central portion of the cylindrical portion 5b is sufficiently smaller than the inner diameter of the screw of the female screw portion 2b, the cylindrical wall of the thick portion 5d in the cylindrical portion 5b is sufficiently larger than the central portion. Become thicker.

  According to the said structure, since the thick part 5d with a thick cylinder wall is formed in the lower part of the cylinder part 5b, the mass of this thick part 5d increases, and the gravity center of the liquid stopper 5 falls below. Accordingly, when the cylindrical portion 5b of the liquid stopper 5 is inserted into the liquid injection port 2a, there is no upright inclination due to the weight of the thick portion 5d, so that the head 5a is turned as it is and the male screw portion 5c is turned into the female screw portion. It can be installed correctly just by screwing it into 2b. In addition, since the thick portion 5d is formed together with the cylindrical portion 5b when the liquid stopper 5 is integrally formed, the manufacturing process does not increase.

  In addition, in the said embodiment, although the thick part 5d which protruded the outer peripheral diameter of the lower part of the cylinder part 5b to the flange shape was shown, the thick part by which the cylinder wall of the lower part of this cylinder part 5b became thick even partly If it is, it does not necessarily need to be a flange shape. Moreover, in the said embodiment, in order to insert a splash-proof body in the cylinder of the cylinder part 5b, although the inner peripheral diameter of the thick part 5d was not protruded inside, the shape of this splash-proof body was changed. If the insertion is enabled, the inner peripheral diameter of the thick portion 5d can be protruded inward, and instead of protruding the outer peripheral diameter, the inner peripheral diameter may be protruded only inward.

  Moreover, in the said embodiment, although shown about the liquid stopper 5 provided with the disk shaped head 5a and the cylindrical cylinder part 5b, these shapes are arbitrary and shall be polygonal shapes, such as a rectangle and a hexagon. You can also. When the cylindrical part 5b is a polygonal cylindrical shape, the outer periphery of the thick part 5d is cylindrical, so that the outer periphery of the thick part 5d protrudes outside the circumscribed circle of the cylindrical part 5b. You can also avoid it.

  Moreover, in the said embodiment, although the lead storage battery from which the head 5a of the liquid stopper 5 protrudes from the upper surface of the battery case lid 2 was demonstrated, the upper surface of this head 5a becomes substantially flush with the upper surface of the battery case lid 2. Such a top flat type lead-acid battery can be similarly implemented. Furthermore, in the said embodiment, although the battery case 1 showed about the lead storage battery divided into six cell chambers, the number of this cell chamber is arbitrary and can be implemented similarly to a single cell lead storage battery. .

  By the way, in order to obtain the same effect as the present invention, instead of forming the thick part 5d at the lower part of the cylindrical part 5b of the liquid stopper 5, a metal weight member may be arranged at the lower part of the cylindrical part 5b. Good. However, it is necessary to take certain safety measures so that the weight member does not come off the liquid stopper 5 and fall into the cell chamber.

  As the weight member, for example, as shown in FIG. 2, a weight ring 7 attached to the lower portion of the cylindrical portion 5b of the liquid stopper 5 can be used. The weight ring 7 is a ring-shaped weight member made of lead or a lead alloy, and is externally fitted so as not to be detached from the outer peripheral surface of the lower portion of the cylindrical portion 5b. The outer diameter of the weight ring 7 is also formed to be slightly smaller than the inner diameter of the female screw portion 2b so as not to be caught when inserted into the liquid injection port 2a of the battery case lid 2.

  In addition, as the weight member, for example, as shown in FIG. 3, a weight stopper 8 attached to the lower part of the cylindrical portion 5 b of the liquid stopper 5 can be used. The weight plug 8 is a disk-shaped weight member made of lead or a lead alloy, and is inserted so as to close the opening hole at the lower end of the cylindrical portion 5b. Accordingly, the splash-proof body 9 is first inserted into the cylinder of the cylinder portion 5b of the liquid stopper 5, and then the weight stopper 8 is inserted so as to close the opening hole. In addition, the splash-proof body 9 may be assembled to the weight stopper 8 in advance. For example, the splash-proof body 9 can also be integrally cast with the weight stopper 8 as lead or lead alloy.

  The liquid stopper 5 using the weight ring 7 and the weight stopper 8 is also inclined when the cylindrical portion 5b is inserted into the liquid injection port 2a because the lower portion of the cylindrical portion 5b is heavy and the center of gravity is lowered downward. Disappear. Moreover, since the weight ring 7 and the weight stopper 8 are made of lead or lead alloy having an extremely high specific gravity compared to the resin of the liquid stopper 5, the center of gravity of the liquid stopper 5 can be greatly lowered and inserted into the liquid inlet 2a. The stability at the time of doing can be improved.

  The configuration of the weight ring 7 and the weight plug 8 is an example of a weight member, and any structure may be used as long as it is a weight member disposed at the lower portion of the cylindrical portion 5b of the liquid stopper 5. Further, the arrangement method of the weight member at the lower portion of the cylindrical portion 5b is also arbitrary. For example, a weight member made of lead or lead alloy is integrally formed on the lower portion of the cylindrical portion 5b of the resin-made liquid stopper 5 by insert molding. It can also be arranged.

  Further, the weight member may be made of another metal having an electrolytic solution resistance instead of lead or a lead alloy. Furthermore, the weight member can be made of ceramics having a specific gravity sufficiently higher than that of the resin and also having insulation properties and resistance to electrolytic solution.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged longitudinal sectional view illustrating a state when a liquid stopper having a thick portion is attached to a liquid inlet of a battery case lid, showing an embodiment of the present invention. It is a partial expanded longitudinal cross-sectional view which shows the reference example of this invention, Comprising: The state at the time of mounting | wearing the liquid stopper using a weight ring with the injection hole of a battery case cover. It is a partial enlarged longitudinal cross-sectional view which shows the reference example of this invention, Comprising: The state at the time of mounting | wearing the liquid stopper using a weight stopper with the injection hole of a battery case lid. It is a perspective view which shows a prior art example and shows the structure of the lead acid battery provided with the liquid stopper. It is a partial expanded longitudinal cross-sectional view which shows a prior art example, and shows the state before (a) and after mounting | wearing (b) which attaches a liquid stopper to the injection hole of a battery case lid. It is a partial expanded longitudinal cross-sectional view which shows a prior art example and shows the liquid stopper inclined by inserting a cylinder part into the injection hole of a battery case lid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery case 2 Battery case lid 2a Injection hole 2b Female screw part 3 Positive electrode terminal 4 Negative electrode terminal 5 Liquid stopper 5a Head part 5b Tube part 5c Male screw part 5d Thick part 6 Packing 7 Weight ring 8 Weight stopper 9 Splash body

Claims (1)

In a lead-acid battery having a liquid stopper to which a male screw part formed on an upper part of a cylindrical part projecting below the head is screwed onto a female screw part of a liquid inlet of a battery case lid,
A lead-acid battery characterized in that a thick part is formed in the lower part of the cylindrical part of the liquid stopper.

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