JP4403795B2 - Control valve type lead acid battery - Google Patents

Description

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

  FIG. 7 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 and the electrode plate group Form.

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

  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. 6). Then, the epoxy resin 7a is poured from above to be solidified and sealed, and the pole column 2 is firmly fixed to the lid 3 (FIG. 6).

  Here, a brass core for connection to an external load is embedded above the pole 2 and a female screw is cut at the center (FIG. 6). 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 recognized.

  Therefore, the outer surface portion of the conventional bushing 4 is provided with a ring-shaped uneven portion 9, which enhances the adhesion of this portion and increases the distance until the dilute sulfuric acid electrolyte filtrates to the outside. Ingenuity has been made.

  Further, studies have been made to cover the inside of the bushing 4 at the time of molding with the lid 3 to increase the distance until the dilute sulfuric acid electrolyte solution filtrates 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 over 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). Or lead oxide (mainly generated at the positive electrode portion).

  When the above-described 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 problems, as one embodiment according to the present invention, a recess 8 is provided at the bottom of the bushing embedded in the lid, and the recess 8 includes a synthetic resin constituting the lid 3, For example, it is filled with polypropylene resin.

  As another embodiment according to the present invention, a concave portion 8 (space portion) is provided in advance in a close contact portion between the bottom of the bushing and the lid, and the concave portion 8 is filled with an adhesive, for example, an epoxy resin. It is a thing.

  In addition, the control valve type lead-acid battery according to the present invention uses a lid that is formed by applying a solution-type hot-melt adhesive on the outer surface of a substantially cylindrical bushing in advance and then insert-molding the resin. It is.

That is, the invention of claim 1 is a control valve type lead-acid battery in which a substantially cylindrical bushing having a ring-shaped uneven portion is embedded in a synthetic resin lid,
The bottom portion of the bushing is configured with a recess,
The recess is intended characterized that you present solution type hot melt adhesive.

  As an effect of the present invention, a control valve type lead storage battery in which the internal dilute sulfuric acid electrolyte is difficult to filtrate outside is excellent.

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

1. Production of Lid As described later, the lid 3 in which various bushings 4 were embedded was used. These bushings 4 are made of lead alloy, have a substantially cylindrical shape, and have a large number of ring-shaped uneven portions 9 on the side surface portions (FIG. 5). Note that these bushings 4 are produced by casting.

  1 to 4, the ring-shaped uneven portion 9 of the bushing 4 is insert-molded into the lid 3. In other words, the bushing 4 of various shapes was experimented using the embedded lid 3 by insert-molding a synthetic resin polypropylene resin by a method conventionally used (FIGS. 1 to 4). .

2. Production of Control Valve Type Lead Acid Battery FIG. 7 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 and the electrode plate group Form.

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

  Next, after the electrode plate group is stored in the battery case 14, the lid 3 in which the bushing 4 is embedded 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 2 is heated, for example, burner welded to form the welded portion 5 (FIG. 6). Then, the epoxy resin 7a 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 for connecting to an external load is embedded above the pole 2 and a female screw is cut in the center thereof. 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 produced 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 1
As shown in FIG. 1- (a), a lid 7 was fabricated using a substantially cylindrical bushing 4 having a recess 8 on the bottom surface. Here, the bushing 4 used in Example 1 is provided so that the inner part and the outer part of the recess 8 have substantially the same height.

  That is, the bottom portion of the bushing 4 made of lead alloy has a concave portion 8, and the concave portion 8 is filled with a synthetic resin constituting the lid 3, for example, a polypropylene resin. The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

(Example 2)
As shown in FIG. 1- (b), a lid 7 was produced using a substantially cylindrical bushing 4 having a recess 8 on the bottom surface. Here, the bushing 4 used in Example 2 is provided so that the inner part of the recess 8 protrudes more than the outer part.

  That is, the bottom portion of the bushing 4 made of lead alloy has a concave portion 8, and the concave portion 8 is filled with a synthetic resin constituting the lid 3, for example, a polypropylene resin. The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

(Example 3)
As shown in FIG. 2- (a), a lid 7 was fabricated using a bushing 4 having a substantially cylindrical shape that protrudes from the inside of the bottom surface portion to the outside. A concave portion 8 (space portion) is formed between the inner portion of the bushing 4 and the synthetic resin constituting the lid 3, for example, a polypropylene resin, and an adhesive such as an epoxy resin 7b is formed in the concave portion 8. Filled.

  That is, in the bottom portion of the lead alloy bushing 4, a recess 8 is formed between the bushing 4 and the synthetic resin constituting the lid 3, and the recess 8 is filled with an epoxy resin 7b. It is said. The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

Example 4
As shown in FIG. 2B, a lid 7 was manufactured using a bushing 4 having a substantially cylindrical shape that protrudes from the inside of the bottom surface portion to the outside. Then, a recess 8 (space portion) similar to that shown in FIG. 2A is formed between the inner portion of the bushing 4 and the synthetic resin constituting the lid 3, for example, polypropylene resin. Was filled with an adhesive, for example, epoxy resin 7b.

  That is, in the bottom part of the lead alloy bushing 4, a recess 8 is formed between the bushing 4 and the synthetic resin constituting the lid 3, and the recess 8 is filled with an epoxy resin 7b. It is said. The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

(Example 5)
As shown in FIG. 1- (a), a lid 7 was produced using a substantially cylindrical bushing 4 having a concave portion 8 on the bottom surface in the same manner as in Example 1.

  Here, a solution type hot melt adhesive (Aron Melt PPET-1505SG28, manufactured by Toagosei Co., Ltd.) is applied to the ring-shaped uneven portion 9 on the outer surface of the bushing 4 having a substantially cylindrical shape in advance using the brush 19 (see FIG. 8) A lid 3 in which a bushing 4 was insert-molded with a polypropylene resin after drying in an atmosphere at about 25 ° C. for about 25 hours was used. In other words, a solution type hot melt adhesive is present at the boundary between the bushing 4 and the lid 3.

  In addition, the bottom portion of the lead alloy bushing 4 has a recess 8, which is characterized in that the recess 8 is filled with a synthetic resin constituting the lid 3, for example, a polypropylene resin. . The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

(Comparative example)
As a comparative example, as shown in FIG. 4, a bushing 4 in a cast state was used as it was, and then a lid 3 insert-molded using polypropylene resin was used. That is, the conventionally used lid 3 having a structure in which the bottom portion of the substantially cylindrical bushing 4 is covered with a resin, for example, a polypropylene resin, is used. The production conditions and test conditions of other control valve type lead-acid batteries are as described above.

  These five types of control valve type lead-acid batteries were subjected to an accelerated life test under the above-described conditions, and then disassembled and examined for acid reaction using a reagent to confirm the state of the electrolyte rising. As a result, in the comparative example, there was an acid reaction up to the fifth stage of the bushing shown in FIG. 5, whereas no acid reaction was observed in Examples 1 to 5 according to the present invention. Here, visually, when the hot melt adhesive is present at the boundary between the bushing 4 and the lid 3 as in the fifth embodiment, the bushing 4 and the lid 3 are compared with those in the first to fourth embodiments. It was confirmed that the dilute sulfuric acid electrolyte solution was more difficult to enter at the first stage of the boundary.

  In the control valve type lead-acid battery according to the present invention, a recess 8 is formed in the bottom portion of the bushing 4 and the lid 3, and the recess 8 is covered with a polypropylene resin or an epoxy resin 7 b constituting the lid 3. As a result, it is considered that the dilute sulfuric acid electrolyte does not easily enter the boundary between the bushing 4 and the lid 3 and is difficult to filtrate.

  Instead of the structure of Example 3 (FIG. 2- (a)) or Example 4 (FIG. 2- (b)), (FIG. 3- (a)) or (FIG. 3- (b)) Even if a simple structure was used, almost the same good results were obtained.

  Although detailed results are omitted, the R & B softening point of the hot-melt adhesive used in Example 5 (the details of the method for measuring the R & B softening point are defined in JISK6363). It was found that 100 ° C. to 300 ° C. is preferable, and that 200 ° C. to 250 ° C. is more preferable.

  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 a cross-sectional schematic diagram of the bushing part concerning this invention. It is a cross-sectional schematic diagram of the bushing part concerning this invention. It is a cross-sectional schematic diagram of the bushing part concerning this invention. It is the cross-sectional schematic of the conventional bushing part. It is the schematic which shows the shape of a bushing. It is the cross-sectional schematic of the bushing part vicinity of a control valve type lead acid battery. It is a notch figure of a control valve type lead acid battery. It is the schematic of the process of apply | coating a solution type hot-melt-adhesive to the outer surface of a bushing.

Explanation of symbols

1: terminal part, 2: pole pole, 3: lid, 4: bushing, 5: welded part, 6: brass core,
7a, b: epoxy resin, 8: recessed portion, 9: ring-shaped uneven portion, 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 (1)

In the control valve type lead storage battery in which the bushing having a substantially cylindrical shape having a ring-shaped uneven portion is embedded in a synthetic resin lid,
The bottom portion of the bushing is configured with a recess,
Valve-regulated lead-acid battery in the recess, characterized that you present solution type hot melt adhesive.

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