JP2005044678A - Control valve type lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control valve type lead-acid storage battery having such a structure that an internal electrolytic solution is hardly filtrated from the boundary part of a cap 3 and a bushing 4. <P>SOLUTION: This has a nearly cylindrical shape, and the bushing 4 made of a lead alloy which has such a structure having a ring state uneven part 9 on the outer side face is fabricated by casting. A solution type hot melt adhesive in which an R & B softening point is 100°C to 300°C is applied to the ring state uneven part 9 of the outer side face of the bushing 4 with a brush 19, and dried at room temperatures. After that, the bushing 4 is insert-molded by using polypropylene resin, and the cap 3 is fabricated. The control valve type lead-acid storage battery is manufactured by using that cap 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve-regulated lead-acid battery.

  FIG. 4 is a schematic view of a general control valve type lead-acid battery conventionally used. That is, power generating elements such as the positive electrode plate 11 and the negative electrode plate 12 are laminated via the separator 13, and the ears 18 of the positive electrode plate 11 and the negative electrode plate 12 are welded to the strap 16 having the pole column 2 to form an electrode plate group. Form.

  Here, a bushing 4 having a ring-shaped uneven portion 9 as shown in FIG. 1 is formed in the lid 3 in an embedded state by insert molding (FIG. 2).

  Next, after the electrode plate group is accommodated in the battery case 14, the lid 3 on which the bushing 4 is insert-molded is covered. That is, the upper pole column 2 of the electrode plate group is fitted so as to pass through the central hole of the substantially cylindrical bushing 4, and the facing portion between the battery case 14 and the lid 3 is joined, for example, heat Weld and integrate.

  The welded portion 5 is formed by heat-welding, for example, burner welding, the fitting portion between the bushing 4 of the lid 3 and the pole column 2 (FIG. 3). Then, the epoxy resin 7 is poured from above to be solidified and sealed, and the pole 2 is firmly fixed to the lid 3 (FIG. 3).

  Here, a brass core 6 for connection to an external load is embedded above the pole 2 and a female screw is cut at the center (FIG. 3). Then, a lead wire having a crimp terminal (not shown) attached to the brass core 6 is fastened to the terminal portion 1 by tightening with a bolt or the like.

  When dilute sulfuric acid used as electrolyte passes through the boundary between the outer surface of the bushing 4 and the resin lid 3 due to the use of a control valve type lead-acid battery for a long period of time. Was observed (see FIG. 3).

  In view of this, the outer surface portion of the conventional bushing 4 is provided with a ring-shaped uneven portion 9, which is devised to increase the distance until the dilute sulfuric acid electrolyte filtrates to the outside.

  Further, studies have been made to increase the distance until the inside of the bushing 4 is coated with the lid 3 during molding with the dilute sulfuric acid electrolyte solution to the outside (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2002-313315

  However, when a valve-regulated lead-acid battery is used for a long period of time, it is converted to lead sulfate on the surface of the lead alloy pole column 2 and the inner side surface of the bushing 4 by the dilute sulfuric acid electrolyte (mainly the negative electrode). It is known that it is generated at the portion) or lead oxide (mainly generated at the positive electrode portion).

  When the lead sulfate or lead oxide accumulates in the gap 7 portion between the inner side surface portion of the bushing 4 and the pole column 2, a force is applied to the substantially cylindrical bushing 4 in the outward direction. Here, the bushing 4 made of lead alloy and the lid 3 made of resin are joined only by a physical bonding force. As a result, there was a problem that the bushing 4 was peeled off from the lid 3 and the dilute sulfuric acid electrolyte leaked to the outside.

  An object of the present invention is to provide a control valve type lead-acid battery having a structure in which dilute sulfuric acid electrolyte hardly leaks to the outside even when used for a long period of time.

  In order to solve the above-described problems, the control valve type lead-acid battery according to the present invention applies a solution type hot melt adhesive to the outer surface of a substantially cylindrical bushing in advance, and then insert-molds the resin. It uses a lid with a proof.

  That is, the invention according to claim 1 is a control valve type lead-acid battery in which a substantially cylindrical bushing having a ring-shaped uneven portion is insert-molded in a synthetic resin lid, and a boundary portion between the bushing and the lid Is characterized by the presence of a solution-type hot melt adhesive.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the R & B softening point of the solution type hot melt adhesive is 100 ° C to 300 ° C.

  As an effect of the present invention, it is excellent because a dilute sulfuric acid electrolyte solution can provide a control valve type lead storage battery that is difficult to filtrate to the outside.

  Hereinafter, the best mode for carrying out the present invention will be described in detail.

1. Production of Lid As described later, a lid 3 in which two types of bushings 4 were embedded was used. These bushings 4 are made of a lead alloy, have a substantially cylindrical shape, and have a large number of ring-shaped uneven portions 9 on the side surfaces thereof (FIG. 1). Note that these bushings 4 are produced by casting.

  Then, as shown in FIG. 2, the ring-shaped uneven portion 9 of the bushing 4 is produced by insert molding on the lid 3. That is, as will be described in detail later, an experiment was conducted using a lid 3 that was insert-molded using polypropylene resin as a material by a method that conventionally used two types of bushings 4.

2. Production of Control Valve Type Lead Acid Battery FIG. 4 is a schematic diagram of the control valve type lead acid battery used in the experiment. That is, power generating elements such as the positive electrode plate 11 and the negative electrode plate 12 are laminated via the separator 13, and the ears 18 of the positive electrode plate 11 and the negative electrode plate 12 are welded to the strap 16 having the pole column 2 to form an electrode plate group. Is formed.

  Here, a bushing 4 having a ring-shaped uneven portion 9 as shown in FIG. 5 is embedded in the lid 3 by insert molding (FIGS. 1 to 3).

  Next, after the electrode plate group is accommodated in the battery case 14, the lid 3 on which the bushing 4 is insert-molded is covered. That is, the pole column 2 of the electrode plate group is fitted so as to pass through the central hole of the substantially cylindrical bushing 4, and the facing portion between the battery case 14 and the lid 3 is joined, for example, heat welding is performed. To do.

  The fitting portion between the bushing 4 of the lid 3 and the pole column 2 is heat-welded, for example, burner welded to form a welded portion 5 (FIG. 3). Then, the epoxy resin 7 is poured from above to be solidified and sealed, and the pole column 2 is firmly fixed to the lid 3.

  Here, a brass core 6 for connection to an external load is embedded above the pole 2 and a female screw is cut at the center. Then, a lead wire with a crimp terminal (not shown) attached to the brass core 6 is fixed to the terminal portion 1 by fastening with a bolt or the like.

  Then, after injecting dilute sulfuric acid electrolyte solution with a conventional method, a battery case is formed, and a safety valve is attached and sealed, and 2V-1000Ah (however, 20 hour rate discharge capacity) control valve type control valve type lead A storage battery was produced.

3. Control valve type lead acid battery filtrate test The manufactured control valve type lead acid battery has an accelerated life in which 6 cells are connected in series under a test environment of 60 ° C and constant voltage charging of 13.65 V is performed continuously for 18 months. A test was conducted. Thereafter, the terminal part 1 of each control valve type lead-acid battery is disassembled, and up to which part of the ring-shaped uneven part 9 of the bushing 4 (the first to eighth stage parts in FIG. 1), the dilute sulfuric acid electrolysis inside We investigated whether the liquid was crawling up.

  Hereinafter, examples of the present invention will be described in detail.

(Example)
As shown in FIG. 1, the control valve type lead-acid battery according to the present invention has a solution-type hot melt adhesive (Aronmelt PPET-1505SG28, Toago) on the ring-shaped uneven portion 9 on the outer surface of a bushing 4 having a substantially cylindrical shape in advance. (Manufactured by Synthetic Co., Ltd.) was applied using a brush 19 (FIG. 1), dried in an atmosphere of about 25 ° C. for about 25 hours, and then a lid 3 in which a bushing 4 was insert-molded using a polypropylene resin was used. In other words, a solution type hot melt adhesive is present at the boundary between the bushing 4 and the lid 3. The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

(Comparative example)
As a comparative example, the bushing 4 in a cast state was used as it was, and then a lid 3 insert-molded using a polypropylene resin was used. That is, the lid 3 in which the bushing 4 was insert-molded was produced by a conventional method. The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

  These two types of valve-regulated lead-acid batteries were subjected to an accelerated life test under the above-mentioned conditions, and then the terminal part 1 was disassembled and acid reaction was confirmed. As a result, in the control valve type lead storage battery of the comparative example, an acid reaction was recognized up to the fifth stage of the bushing 4 shown in FIG. 1, whereas in the control valve type lead storage battery of the embodiment according to the present invention, the bushing was performed. The acid reaction was observed only up to the first stage of 4.

  In the control valve type lead-acid battery according to the present invention, the hot melt adhesive is present at the boundary between the bushing 4 and the lid 3, so that the dilute sulfuric acid electrolyte does not easily enter the boundary between the bushing 4 and the lid 3. It is thought that it is difficult to filtrate.

  Although the detailed results are omitted, the R & B softening point of the hot melt adhesive used in the examples (the details of the measuring method of the R & B softening point are defined in JISK6363) is 100. It was found that the temperature was preferably from 300 ° C to 300 ° C, more preferably from 200 ° C to 250 ° C.

  By using the present invention, it is possible to provide a control valve type lead-acid battery having a structure in which the internal electrolyte is difficult to filtrate from the boundary portion between the lid and the bushing.

It is the schematic of bushing. It is the cross-sectional schematic of the bushing part insert-molded in the lid | cover. It is a section schematic diagram of a terminal part of a control valve type lead acid battery. It is a notch figure of a control valve type lead acid battery.

Explanation of symbols

1: terminal part, 2: pole pole, 3: lid, 4: bushing, 5: welded part, 6: brass core,
7: Epoxy resin, 8: Concavity, 9: Ring-shaped uneven part, 11: Positive electrode plate, 12: Negative electrode plate
13: Separator, 14: Battery case, 15: Safety valve part, 16: Strap, 18: Ear part,
19: Bake

Claims (2)

In a control valve type lead-acid battery in which a substantially cylindrical bushing having a ring-shaped uneven portion is insert-molded in a synthetic resin lid, a solution-type hot-melt adhesive is provided at the boundary between the bushing and the lid A valve-regulated lead-acid battery, characterized in that The R & B softening point of the solution-type hot-melt adhesive is 100 ° C to 300 ° C.

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