JP2004247095A - Lead storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead storage battery that prevents the mounting section between a pedestal and an electrode column from being fused when energizing a large current to the lead storage battery and can withstand large current energization. <P>SOLUTION: In the lead storage battery, the pedestal 4 is welded to a strap 5, where lug groups 2a, 2a, and so on of electrodes 2, 2, and so on having the same polarity as a group 1 of plates are welded, and the electrode column 3 is welded to the pedestal 4. In this case, the thickness of the pedestal 4 is increased from the side of the strap 5 toward the side of the electrode column 3. In the lead storage battery comprising the pedestal 4 welded to the strap 5 where the group of lugs of the group of electrodes is welded, and the electrode column welded to the pedestal, the thickness of the pedestal is gradually increased from the side of the strap toward the side of the electrode column, thus increasing fusing-resistant properties when energizing a large current. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lead storage battery.
[0002]
[Prior art]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-173579 Conventionally, positive and negative electrode plates are alternately stacked via a separator to assemble an electrode group, and the same polarity electrode plates are arranged in a line in the stacking direction of the positive and negative electrode plates. A lead storage battery formed by welding a group of ears having a predetermined shape, a pedestal having a predetermined shape welded to the outer surface of the strap, and a pole is welded to the pedestal is manufactured as follows, for example. That is, a comb-shaped jig is inserted and inserted between the ears of the same polarity of the electrode plate group, and a lead or a lead is previously formed on the bottom surface of a concave mold having a predetermined surrounding shape on the base side of the jig. A cast formed by integrally casting a terminal pole or intermediate pole having a predetermined shape and a pedestal with a lead alloy is accommodated in a mold of the jig, and the pedestal is placed close to the ear row. In this state, the ear group is welded while melting a welding material such as a bar-shaped lead or alloy with a burner, and at the same time, the strap is formed into a predetermined shape, and the inner end face of the base and the outer face of the strap are welded to each other. Manufactured. Alternatively, in place of such a manufacturing method, the terminal pole or the intermediate pole, which has been cast in advance, is housed in the mold of the jig, and placed on the bottom surface of the jig. While melting the material with a burner, the ears are welded and the strap is formed into a predetermined shape at the same time, and the molten material is poured into the mold, which is welded to the side of the strap and has a predetermined shape according to the mold. In addition, a pedestal having a certain thickness is formed, and at the same time, the pedestal is welded to the outer peripheral surface of the pole.
Thus, the lead storage batteries (that is, cells) manufactured in this manner are housed in each cell chamber of the battery case, and the intermediate pole is welded to each other through a partition partitioning each cell room in the battery case. In general, the terminal pole is welded integrally with a bushing terminal formed on a lid provided in a battery case to form a terminal, thereby manufacturing a lead-acid battery composed of 6 cells.
By the way, in recent years, a lead storage battery is required to have a large capacity and discharge a large current to a load. In order to achieve this object, for example, Patent Document 1 has been proposed. That is, Patent Literature 1 discloses a strap in which a cross-sectional area of a strap in a direction parallel to a plate surface direction of each ear of an electrode plate group is gradually reduced as a distance from a portion where the pole is located. This strap is divided into a part corresponding to a conventional so-called long rectangular strap for welding the ear group of the electrode plate group and a part corresponding to a so-called pedestal for connecting the strap and the pole, and is understood as being separated. The thickness of the pedestal is constant.
[0003]
[Problems to be solved by the invention]
The portion corresponding to the pedestal disclosed in the above Patent Document 1 is connected to a long rectangular so-called strap having a substantially triangular planar shape and connected to a group of ears on the bottom side thereof, so that when the power is supplied, However, there is an inconvenience that when a large current is applied, fusing occurs at a location (boundary portion) where the pole is attached in a relatively short time.
The present invention solves the above-mentioned disadvantages of the conventional lead-acid battery, and when a large current is applied, prevents a fusing at a mounting portion (boundary portion) between the pedestal and the pole and can withstand a large current. The purpose is to provide.
[0004]
[Means for Solving the Problems]
The lead storage battery according to the present invention is characterized in that a positive electrode and a negative electrode are alternately stacked with a separator interposed therebetween, and a set of assembled electrode plates is arranged in a line, and a set of electrode plates having the same polarity is welded to a strap, and the outer surface of the strap is In the lead storage battery formed by welding the pedestal and the pole to the pedestal, the thickness of the pedestal is gradually increased from the strap side to the side where the pole is located.
Further, the present invention provides a lead-acid battery which has achieved the above-mentioned object while minimizing an increase in the mass of the pedestal, wherein the width between both side surfaces of the pedestal is gradually reduced toward the side where the pole is located. It is characterized by having a tapered shape.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
1 and 2 show a lead storage battery (cell) according to an embodiment of the present invention. In one example of the manufacturing method, a desired number of positive plates and negative plates are alternately laminated via a separator to assemble an electrode plate group. In FIG. 1, reference numeral 1 denotes an electrode plate group, but for convenience, a separator interposed between the positive and negative electrode plates and one of the positive and negative electrode plates is not shown. Between the ears 2a of the ear groups 2a, 2a,... Arranged in a line in the stacking direction and projecting upward from one side of the upper edge of one of the stacked polar plates 2, 2,. A comb-shaped jig (not shown) is inserted, and a pedestal and a terminal pole are integrally cast in advance with lead or a lead alloy, in the illustrated example, a lead-tin alloy, or the intermediate pole 3. In the example shown in the figure, a cast body formed by integrally casting the pedestal 4 is formed from the cylindrical terminal pole 3 and the pedestal 4 cast according to the present invention, that is, from the inner end face 4a to be welded to the strap. The trolley 4 has a gradually increasing thickness toward the outer end face 4b on the side where the column 3 is located. More specifically, the bottom face 4c is a horizontal bottom face, and the upper face 4d is directed from the inner end face side to the outer end face 4b, that is, A cast body integrally formed with a pedestal 4 having an inclined surface gradually rising toward the side where the column 3 is located In a state where the casting formed at the base of the jig is fitted and placed in a mold having a fitting concave surface having substantially the same size and shape as the pedestal 4 of the present invention, the casting body has a long shape such as a rod shape or a strip shape. Are welded together with a pair of ears 2a, 2a,... While a welding material (not shown) made of lead or a lead alloy (not shown) is melted by a burner, and a long rectangular strap 5 is formed. 5a and the inner surface 4a of the pedestal 4 were welded to produce the lead storage battery B of the present invention.
The pedestal 4 of the present invention shown in FIG. 1 has a substantially triangular planar shape so as not to increase the mass as much as possible. More specifically, the outer end surface is an isosceles triangle with an arcuate round shape. The end face 4b, that is, the bottom face 4b side is welded to the outer face 5a of the strap 5, and the outer pole face 3 is erected on the top side of the outer end face 4b.
[0006]
As another manufacturing method, the welding material is melted while the cylindrical terminal pole 3 is placed on the bottom surface of the mold of the jig, and the molten lead is poured into the mold. The lead-acid battery B of the present invention is formed by forming the pedestal 4 and welding the inner end surface 4a thereof to the outer surface 5a of the strap 5 and burying and welding the lower end of the pole 3 at the outer end top. May of course be manufactured.
[0007]
The dimensions of each component 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 4mm on the bottom side end surface of the pedestal
Same as above D2 8mm
Same length L 19.5mm from bottom side end face to top side end face
Same width W 17mm of bottom side
Diameter of cylindrical terminal pole 8mm
[0008]
FIG. 3 shows a lead-acid battery B 'of another embodiment of the present invention shown in FIG. 3, except that a pedestal 4 ′ having a home base shape is used as the pedestal. No change. Accordingly, its components are indicated by the same reference numerals as in the previous embodiment.
[0009]
4 and 5 show a conventional lead storage 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 of the width dimension W40a of the bottom side surface is 19.1 mm, which is wider than those of the first and second embodiments of the present invention. The thickness D from the bottom side surface 40a to the top outer end surface 40b was a constant thickness of 4 mm. In addition to the configuration of the electrode group, the shape and dimensions of the strap and the shape and dimensions of the columnar terminal poles are the same as those of the embodiment of the present invention, and thus are indicated using the same reference numerals.
Further, although not shown, instead of the cylindrical terminal poles of the first and second embodiments and the conventional example, a plate-like intermediate pole is housed in the intermediate cell chamber welded to the top side of each pedestal 4. Cells, that is, lead storage batteries B, B ', and C, respectively, were manufactured.
[0010]
Thus, each of the lead storage batteries B, B ', C provided with the pedestals 4, 4', 40 of the first and second embodiments of the present invention and the conventional example, respectively, is replaced with a battery case in accordance with a conventional method. The intermediate pole is welded to each other through a partition partitioning each cell chamber in the battery case, and the positive and negative terminal poles are bushing terminals formed on a lid provided on the battery case. To form positive and negative terminals, respectively, to produce sealed lead-acid batteries for motorcycles.
[0011]
Next, the sealed lead-acid battery of the present invention incorporating the cell using the pedestal 4 of the first embodiment manufactured as described above, and the sealed lead-acid battery of the present invention incorporating the cell using the pedestal 4 'of the second embodiment. After charging the storage battery and the conventional sealed lead-acid battery incorporating the cell using the conventional pedestal 40, respectively, discharging a large current controlled using a variable resistor as a load, and mounting the current and the pole and the pedestal. The time until the portion (boundary portion) X was melted was examined. As a result, the battery using the pedestal 4 of the first embodiment was blown out after 33 seconds at 350A, and the battery using the pedestal 4 'of the second embodiment was blown out after 32 seconds at 350A. The battery using the pedestal 40 was blown at 350 A for 10 seconds. As described above, the fusing resistance to 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 by the pedestals 4 and 4 'in the first and second embodiments, the thickness of the poles 3 of the pedestals 4, 4' is increased by increasing the thickness toward the poles. The area of the cross section at the mounting portion X is increased as compared with the area of the conventional cross section at the mounting portion X of the pole 3 of the pedestal 40 having a constant thickness, and further, gradually increases toward the outer end surface. As a result, it is possible to eliminate the inconvenience of current crowding in the portion X when a large current flows in the portion X as seen in the conventional pedestal 40, that is, the inconvenience that the portion X is easily melted due to large heat generation due to an increase in current-carrying resistance. It can be seen that this results in resistance to fusing.
[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 embodiment, but may be a trapezoidal shape, a semicircular shape, a regular square, a rectangle, or the like. The thickness is gradually increased from the strap side toward the pole.
In this case, it is preferable that the mass of the pedestal does not increase as much as possible. From this viewpoint, it is preferable that the width between both side surfaces is formed so that the width decreases toward the pole. That is, the tapered left and right side surfaces 4d and 4e of the triangular pedestal 4 of the first embodiment are attached to the tapered left and right side surfaces 4 'of the home base pedestal 4' of the second embodiment. It is preferable to form d, 4'e, and in particular, the substantially triangular base 4 of the first embodiment is most suitable. Looking at this in 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 home base-shaped pedestal of the second embodiment is 47. In consideration of the mass of the conventional pedestal of 39.5 g, an increase in the mass is suppressed as much as possible, and an isosceles triangular pedestal is most suitable for improving the fusing resistance. It is.
[0013]
【The invention's effect】
As described above, according to the present invention, in a lead-acid battery including a pedestal welded to a strap welded to an ear group of an electrode plate group and an electrode pillar welded to the pedestal, the thickness of the pedestal is reduced Since the thickness is gradually increased from the side toward the pole, the resistance to fusing when a large current is applied can be improved.
In this case, by increasing the width between the left and right side surfaces of the pedestal toward the side where the pole is located, the width of the pedestal can be reduced as much as possible.
[Brief description of the drawings]
FIG. 1 is a side view of a lead storage battery according to one 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 Pole plate group 2 Pole plate 2a Ear 3 Pole pole 4, 4 'Base 5 Strap B Lead-acid battery B' of the first embodiment of the present invention Lead-acid battery of the second embodiment of the present invention

Claims (2)

A strap in which ears of the same polarity are arranged in a row in an electrode group assembled by alternately stacking positive and negative plates via a separator, a pedestal welded to the outer surface of the strap, and a pedestal. A lead-acid battery comprising a pole and a column, wherein the thickness of the pedestal is gradually increased from the strap side to the side where the pole is located. . 2. The lead-acid battery according to claim 1, wherein the width between both side surfaces of the pedestal is tapered so that the width gradually decreases toward the side where the pole is located.

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