JP4435489B2 - Lead acid battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead acid battery.
[0002]
[Prior art]
[Patent Document 1]
JP, 2000-173579, A Conventionally, a positive electrode group and a negative electrode plate are laminated alternately via a separator to assemble a group of electrode plates, and the electrode groups of the same polarity arranged in a line in the stacking direction of the positive and negative electrode plates are welded. A lead-acid battery formed by welding a predetermined shape of a strap, a base of a predetermined shape welded to the outer surface of the strap, and a pole column to the base is manufactured, for example, as follows. That is, it is enclosed in a state where a comb-like jig is inserted between the ears of the same polarity electrode plates of the electrode plate group, and lead or lead is previously placed on the bottom surface of a predetermined encircling concave mold on the base side of the jig. A cast body formed by integrally casting a terminal pole column or intermediate pole column and a pedestal of a predetermined shape using a lead alloy is accommodated in the mold of the jig, and the pedestal is placed close to the ear row. In this state, a welding material such as a rod-shaped lead or alloy is melted with a burner and the ear group is welded. At the same time, the strap is formed into a predetermined shape and the inner end surface of the pedestal and the outer surface of the strap are welded together. Manufactured. Alternatively, in place of such a manufacturing method, the terminal pole column or the intermediate pole column cast in advance is accommodated in the mold of the jig and placed on the bottom surface of the jig, and the additional lead rod or the like is welded. While melting the material with a burner, the ear group is welded, and at the same time, the strap is formed into a predetermined shape. Further, the molten material is poured into the mold, welded to the side of the strap, and in a predetermined shape according to the mold. In addition, a pedestal having a constant thickness is formed, and at the same time, the pedestal is manufactured by welding the outer peripheral surface of the pole column.
Thus, the lead storage battery (that is, the cell) manufactured in this way is housed in each cell chamber of the battery case, and the intermediate poles are welded to each other through the partition walls defining each cell chamber in the battery case. In general, the terminal pole is welded integrally with a bushing terminal formed on a lid applied to the battery case to form a terminal to manufacture a lead storage battery composed of 6 cells.
By the way, in recent years, lead-acid batteries have been demanded to increase the capacity and discharge a large current to the load. In order to achieve this object, for example, Patent Document 1 has been proposed. That is, Patent Document 1 discloses a strap that gradually decreases the cross-sectional area of the strap in the direction parallel to the plate surface direction of each ear of the electrode plate group as the distance from the portion where the pole column is located. This strap is divided into a portion corresponding to a conventional so-called long rectangular strap that welds the ear group of the electrode plate group and a portion corresponding to a so-called pedestal that connects the strap and the pole column. The thickness of the pedestal is constant.
[0003]
[Problems to be solved by the invention]
The portion corresponding to the pedestal disclosed in Patent Document 1 is connected to a so-called long rectangular strap having a substantially triangular plane shape and an ear group connected to the bottom side of the pedestal. However, when a large current is applied, there is an inconvenience of melting at a location (boundary portion) where the pole column is attached in a relatively short time.
The present invention eliminates the inconveniences of the above-mentioned conventional lead storage battery, and prevents the fusing at the attachment point (boundary part) between the pedestal and the pole pole when energizing a large current. The purpose is to provide.
[0004]
[Means for Solving the Problems]
The lead-acid battery of the present invention comprises a strap welded with a group of electrodes of the same polarity arranged in a row and assembled on the outer surface of the strap. In a lead-acid battery comprising a welded pedestal and a pole column welded to the pedestal, the thickness of the pedestal is gradually increased from the strap side toward the side where the pole column is located.
Furthermore, the present invention provides a lead-acid battery that achieves the above-mentioned object while suppressing an increase in the mass of the pedestal as much as possible, and has an inner end face on the side welded to the strap of the pedestal and an outer side on the side where the pole column is present. The width between the left and right side surfaces extending between the end surfaces is formed in a taper shape that gradually becomes narrower toward the side where the pole column exists .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG.1 and FIG.2 shows the lead acid battery (cell) of one example of implementation of this invention. In one example of the manufacturing method, a desired number of positive electrode plates and negative electrode plates are alternately stacked via a separator to assemble an electrode plate group. In FIG. 1, reference numeral 1 denotes a group of electrode plates. For convenience, a positive electrode plate of one polarity and a separator interposed between the positive electrode plate and the negative electrode plate are not shown. .. Between the ears 2a of the ear groups 2a, 2a,... Arranged in a line in the stacking direction protruding upward from one side of the upper edge of one of the stacked polar plates 2, 2,. While inserting a comb-like jig (not shown), lead or lead alloy, in the example shown, a cast or intermediate pole 3 formed by integrally casting a base and a terminal pole with lead-tin alloy; In the example shown in the figure, a cast body formed by integrally casting the base 4 is formed from the cylindrical terminal pole 3 and the base 4 cast according to the present invention, that is, the inner end face 4a on the side to be welded to the strap. column 3 is in the side of the outer end surface 4b opposite gradually thick and the pedestal 4, more particularly, at its bottom surface 4c is horizontal bottom, top 4d is directed from the inner end surface 4a side to the outer end surface 4b, i.e. , Casting integrally cast with a pedestal 4 having an inclined surface that gradually rises toward the side where the pole 3 is located In a state of being fitted and placed in a mold comprising a concave surface for fitting having substantially the same size and shape as the base 4 of the present invention of the cast body formed at the base of the jig, in the form of a rod, strip, etc. The welding material (not shown) made of lead or a lead alloy is melted with a burner, the ear groups 2a, 2a,... Are welded and a long rectangular strap 5 is formed. A lead storage battery B of the present invention comprising a cell formed by welding the outer side surface 5a and the inner side surface 4a of the base 4 was manufactured.
In addition, the pedestal 4 of the present invention in FIG. 1 has an approximately triangular planar shape so as not to increase the mass as much as possible. More specifically, the outer end surface 4b is an isosceles triangle with an arcuate round shape. The inner end face 4b, that is, the bottom face 4b side is welded to the outer face 5a of the strap 5, and the pole 3 is erected on the outer end face 4b on the top side.
[0006]
As another manufacturing method, in a state where the cylindrical terminal pole 3 is placed on the bottom surface of the mold of the jig, the welding material is melted, and the molten lead is poured into the mold, The pedestal 4 is molded and its inner end face 4a is welded to the outer face 5a of the strap 5, and the lower end portion of the pole 3 is buried and welded on the outer end top side, so that the lead storage battery B of the present invention is used. Of course, may be manufactured.
[0007]
The dimensions of the constituent members of the lead storage battery of the present invention shown in FIGS. 1 and 2 are as follows.
Strap length 23mm
Same thickness 4mm
Thickness D1 8 mm of the bottom side end face of the pedestal
Same side end face thickness D2 4 mm
The length L from the bottom side end surface to the top side end surface L 19.5 mm
Same bottom side end face width W 17mm
Diameter of cylindrical terminal pole 8mm
[0008]
FIG. 3 shows a lead-acid battery B ′ according to another embodiment of the present invention, which is different from the embodiment shown in FIGS. 1 and 2 except that a pedestal 4 ′ having a planar base shape is used as the pedestal. There is no. Accordingly, the components are indicated by the same reference numbers as in the previous embodiment.
[0009]
4 and 5 show a conventional lead-acid battery C for comparison. The lead storage battery C was manufactured by the same manufacturing method as described above. That is, the pedestal 40 has a substantially triangular planar shape, but the width W of the bottom side surface 40a is 19.1 mm wider than that of the first and second embodiments of the present invention described above. The thickness D from the bottom side surface 40a to the outer end surface 40b at the top was a constant thickness of 4 mm. Reference numeral 40 c denotes a horizontal bottom surface of the pedestal 40, and L denotes a length from the bottom side end surface 40 a to the top side end surface 40 b of the pedestal 40. In addition to the configuration of the electrode plate group, the shape and size of the strap and the shape and size of the cylindrical terminal pole column are the same as those in the examples of the present invention, and therefore the same reference numerals are used for display.
Further, although not shown in the drawings, instead of the cylindrical terminal electrode poles of the two embodiments 1 and 2 and the conventional example, a plate-like intermediate pole pole is accommodated in an intermediate cell chamber welded to the top side of each pedestal 4. Lead-acid batteries B, B ', and C comprising the cells to be manufactured were manufactured.
[0010]
Thus, each of the lead storage batteries B, B ', C having the pedestals 4, 4', 40 of the first embodiment, the second embodiment and the conventional example of the present invention is respectively used in the battery case according to a conventional method. The intermediate poles are welded to each other through the partition walls that define the cell chambers in the battery case, and the positive and negative terminal poles are bushing terminals formed on the lid applied to the battery case. Were integrally welded to form positive and negative terminals to produce sealed lead-acid batteries for motorcycles.
[0011]
Next, the sealed lead-acid battery of the present invention incorporating the cell using the base 4 of the first embodiment manufactured as described above, and the sealed lead of the present invention incorporating the cell using the base 4 'of the second embodiment. After charging each of the conventional sealed lead-acid batteries with built-in cells using the storage battery and the conventional pedestal 40, a large current controlled using a variable resistor is discharged as a load, and the current, the pole column, and the pedestal are attached. The time until fusing of the part (boundary part) X was examined. As a result, the battery using the pedestal 4 of the first example was blown after 33 seconds at 350 A, and the battery using the pedestal 4 ′ of the second example was blown after 32 seconds at 350 A, whereas The battery using the pedestal 40 was melted after 350 seconds at 350A. Thus, the fusing resistance against a large current can be improved as compared with the conventional battery using the pedestal 40 having a constant thickness.
As described above, according to the present invention, as shown in the pedestals 4 and 4 'in the first and second embodiments, the thickness of the pedestal 4 and 4' is increased by increasing the thickness toward the pole column. The area of the cross section at the attachment portion X is increased as compared with the area of the cross section at the attachment portion X of the pole pole 3 of the pedestal 40 having a constant thickness, and further gradually increases toward the outer end face. Therefore, the current density in the portion X as seen in the conventional pedestal 40 is concentrated, that is, the inconvenience that the portion X is easily melted due to the large heat generation due to the increase in the conduction resistance is eliminated. It can be seen that it provides fusing resistance at.
[0012]
The planar shape of the pedestal of the present invention is not limited to the substantially triangular shape and the home base shape shown in the embodiments, but may be a trapezoidal shape such as a trapezoidal shape, a semicircular shape, a regular square shape, a rectangular shape, or the like, of course. The thickness is gradually increased from the strap side to the pole column side.
In this case, it is preferable that the mass of the pedestal is not increased as much as possible. From this viewpoint, the inner end surface 4a on the side welded to the strap 5 of the pedestal 40 and the outer end surface on the side where the pole column 3 is present. left and right side surfaces 4d extending between the 4b, it is preferable to form the width between 4e tapered to be directed progressively narrow the side with the pole 3. That is, like the triangular pedestal 4 of the first embodiment, the width between the left and right side surfaces 4d and 4e is tapered so that the width gradually increases toward the side where the pole column 3 exists. Or a part of the width between the left and right side surfaces 4'd and 4'e is directed to the side where the pole column 3 exists , as in the base 4 of the second embodiment. gradually and Turkey be formed in a tapered shape is preferred to be narrow, especially, the base 4 flat shape like a substantially triangular in the first embodiment is most suitable. Looking at the specific examples of the first and second embodiments 1 and 2, the mass of the substantially triangular pedestal of the first embodiment is 45.8 g, and the mass of the platform of the home base shape of the second embodiment is 47. In view of the mass of the conventional pedestal of 39.5 g, an isosceles triangular pedestal is the optimal planar shape to suppress the increase in mass as much as possible and to improve fusing resistance. It is.
[0013]
【The invention's effect】
Thus, according to the present invention, in a lead storage battery comprising a pedestal welded to a welded strap of an ear group of electrode plates and a pole column welded to the pedestal, the thickness of the pedestal is adjusted to the strap side. Since the thickness is gradually increased from the pole toward the pole, the fusing resistance when a large current is applied can be improved.
In this case, an increase in the mass of the pedestal can be suppressed as much as possible by forming a tapered shape between the left and right side surfaces of the pedestal so as to reach a side where the pole column is present.
[Brief description of the drawings]
FIG. 1 is a side view of a lead storage battery according to an embodiment of the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is a side view of a lead storage battery according to another embodiment of the present invention.
FIG. 4 is a side view of a conventional lead storage battery.
FIG. 5 is a plan view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrode plate group 2 Electrode 2a Ear 3 Polar pole 4, 4 'Base 5 Strap B Lead acid battery B' of 1st Example of this invention Lead acid battery of 2nd Example of this invention

Claims (2)

A strap welded to a group of poles of the same polarity arranged in a row and assembled by alternately laminating positive and negative electrodes through separators, a base welded to the outer surface of the strap, and a base A lead-acid battery comprising a cell, wherein the thickness of the pedestal is gradually increased from the strap side toward the side where the pole pole is located. . A taper shape in which the width between the left and right side surfaces extending between the inner end surface of the base welded to the strap and the outer end surface of the pole column gradually becomes narrower toward the pole column side. lead-acid battery according to claim 1, characterized in that formed on.

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