JP2005122916A - Manufacturing method of mono-block type lead acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a mono-block type lead acid storage battery having a penetration welding part with high reliability. <P>SOLUTION: A battery case 13 is formed by polypropylene resin and through holes 10 are perforated on the upper part of battery case separation walls 4. An electrode plate group 12 manufactured by a cast-on welding is inserted in the battery case 13, and protrusions for welding 16 formed on a strap of the electrode plate group 12 adjacent to each other through a battery case separation wall 4 are made to face each other. Here, a hole part 17 is perforated on the protrusion for welding 16 in advance. A pin-shaped connection member 21 made of lead alloy is inserted through the hole part 17 on the protrusion for welding 16 and the through hole 10, and the boundary part is heated and welded by applying a TIG torch 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a monoblock lead-acid battery.

  Monoblock lead-acid batteries have a structure in which a plurality of electrode plate groups are connected in series, and can easily obtain a high voltage and are inexpensive and highly reliable. It is widely used for electric vehicles and portable devices.

  Conventional monoblock lead-acid batteries have a structure as shown in FIGS. That is, using paste-type positive electrode plate 1 and negative electrode plate 2 and laminating through separator 3, the ears are welded to form positive electrode strap 9, negative electrode strap 6, negative electrode terminal pole column 11, etc. After preparing the electrode plate group 12 and inserting the electrode plate group 12 into the battery case 13, the adjacent welding projections 16 are connected in series by resistance welding and sealed with a lid (not shown) It is.

  That is, as shown in FIG. 3, a through-hole 10 is previously formed in the upper part of the battery case partition 4 by punching or the like. Next, the welding projections 16 provided on the straps of the adjacent electrode plate group 12 are opposed to each other, and a large current is passed through this portion in a state where the welding projections 16 are pressurized, so that resistance welding is performed. A welding method was used (FIG. 2).

  As described above, in the through welding method, a through hole is provided in the upper part of the battery case partition 4, the welding projections 16 are brought close to each other with the through hole interposed therebetween, and the resistance welded portion 14 is formed by resistance welding to form a cell. Because of the connection method, the manufacturing cost is lower than that of the overbridge method, and the manufacturing tact can be shortened and the internal resistance can be reduced. Therefore, the penetration welding method is widely used in monoblock lead-acid batteries for portable equipment as well as for automobiles (see, for example, Patent Document 1).

JP 2002-352794 A

  However, in the past, when the electrode plate group 12 was inserted into the battery case 13, it was recognized that the electrode plate group 12 was tilted or inserted in a state of being displaced from the center of the battery case 13. In such a state, the positional relationship between the welding projections 16 formed on the adjacent electrode plate group 12 also shifts. Furthermore, casting defects such as shrinkage cavities were observed in the resistance weld 14 (FIG. 2). As a result, problems such as a decrease in airtightness between cells and a breakage due to a decrease in mechanical strength of the resistance weld 14 are recognized.

  The object of the present invention is to provide a monoblock lead-acid battery that does not have these problems and has a highly reliable through-welded portion.

  In order to solve the above-mentioned problems, the invention of claim 1 according to the present invention is characterized in that after inserting a plurality of electrode plate groups into a battery case partitioned by a battery case partition having a through hole, the through hole is inserted. In the manufacturing method of the monoblock type lead-acid battery, in which the welding projection provided on the strap of the electrode plate group is welded and the adjacent electrode plate groups are manufactured in series, the welding projection A hole portion is formed, and a boundary portion between the welding projection and the pin-shaped connection member is heated and welded in a state where the pin-shaped connection member is inserted into the hole portion.

  According to a second aspect of the present invention, in the method for manufacturing a monoblock lead-acid battery according to the first aspect, the welded portion between the pin-shaped connecting member and the welding projection is reinforced by a ring-shaped member. It is what.

  As an effect of the present invention, a monoblock lead-acid battery having a highly reliable through-welded portion can be provided.

Hereinafter, the best mode for carrying out the present invention will be described in detail.
As shown in FIG. 3, after using a paste-type positive electrode plate 1 and a negative electrode plate 2 and laminating them via a separator 3, each ear is cast-on welded to form a positive strap 9, a negative strap 6, and a weld. The electrode plate group 12 having the projections 16 and the like is produced. The positive strap 9, the negative strap 6, and the welding projection 16 are each made of a lead alloy.

  The battery case 13 is formed by molding a polypropylene resin, and then a through hole 10 is previously punched in the upper part of the battery case partition 4 (FIG. 3). The electrode plate group 12 produced by cast-on welding is inserted into the battery case 13, and the welding projections 16 formed on the straps of the adjacent electrode plate group 12 are made to face each other via the battery case partition wall 4 (FIG. 4).

  Here, a hole 17 is formed in advance in the opposing welding projection 16 according to the present invention (FIG. 1A). A pin-shaped connecting member 21 made of a lead alloy is inserted into the hole 17 of the adjacent pair of welding projections 16 and the through hole 10 of the battery case 13 (FIG. 1A).

  In this state, a TIG torch 23 was applied to the boundary between the welding projection 16 and the pin-like connecting member 21 and heated, and TIG welding (tungsten inert gas welding) was performed to form a weld 22a (see FIG. 1 (b)).

  Further, in order to reinforce the welded portion between the welding projection 16 and the pin-shaped connecting member 21, the ring-shaped member 24 is inserted into the pin-shaped connecting member 21, and the above-described TIG welding is performed to form the welded portion 22b. (FIG. 1 (c)).

  When the present invention is used, the pair of welding projections 16 are TIG welded via the pin-like connecting member 21, so that no shrinkage occurs. Further, this portion is reinforced by the ring-shaped member 24. As a result, a highly reliable through-weld portion can be formed, and there is no problem that the airtightness between the cells is lowered, and the mechanical strength of the resistance welded portion 14 is lowered and broken.

  When the present invention is used, a monoblock lead-acid battery having a highly reliable through-welded portion can be provided.

It is the cross-sectional schematic (a) of the penetration weld part concerning this invention product. It is the cross-sectional schematic (b) of the penetration weld part concerning this invention product. It is the cross-sectional schematic (c) of the penetration weld part concerning this invention product. It is a section schematic diagram of the conventional penetration welding part. It is the schematic of an electrode group insertion process. It is a principal part schematic of the monoblock type lead acid battery using a penetration welding system.

Explanation of symbols

1: positive electrode plate, 2: negative electrode plate, 3: separator, 4: battery case partition, 5: negative electrode ear,
6: negative electrode strap, 8: positive electrode ear, 9: positive electrode strap, 10: through hole,
11: Electrode column for negative electrode terminal, 12: Electrode plate group, 13: Battery case, 14: Resistance welding part,
16: welding projection, 17: hole, 21: pin-shaped connecting member, 22a, b: welded portion,
23: TIG torch, 24: ring-shaped member

Claims (2)

After inserting a plurality of electrode plate groups into a battery case partitioned by a battery cell partition wall having a through hole, welding welding protrusions provided on the strap of the electrode plate group through the through hole, In the manufacturing method of the monoblock type lead acid battery manufactured by connecting adjacent electrode plates in series,
The welding projection has a hole in advance, and a welding is performed by heating the boundary between the welding projection and the pin-shaped connecting member in a state where the pin-shaped connecting member is inserted into the hole. The manufacturing method of the monoblock type lead acid battery characterized by the above-mentioned.   A method for manufacturing a monoblock lead-acid battery, wherein a welded portion between the pin-shaped connecting member and the welding projection is reinforced by a ring-shaped member.

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