JP3986755B2 - Lead acid battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead storage battery for automobiles and the like.
[0002]
[Prior art]
As a conventional lead acid battery for automobiles, for example, as shown in FIGS. 7 and 8, a lead acid battery for large diesel is known. For convenience of explanation, connecting members such as a strap and a pole column for connecting the electrode plate groups in each cell chamber in series are omitted.
That is, the outer dimensions of the battery case B of the lead storage battery A intersect with each other at right angles so that the four corner portions b, b, b, b are bulged corner portions, respectively, so as to be the outer dimensions defined by JIS standards. Vertical ribs R1 that serve as bulging walls b11 and b21 that bulge outward at the portions where the side wall b1 in the width direction and the side portion b2 in the length direction intersect with each other at right angles, and also serve as reinforcement at regular intervals on the outer surface. , R1, R1,... Are arranged. Thus, hollow portions H, H, H, H are formed inside the corner portions b, b, b, b of the four bulged corners.
In each cell chamber C, C of the battery case B, in the illustrated example, electrode plate groups G, G,... Are accommodated in six cell chambers C, C,. .. Are formed in advance by integral molding on the inner surfaces of the opposing walls D, D,... Of the opposing cell chamber C of the negative electrode plates n, n at both ends, and are arranged at intervals in the width direction of the electrode plate group G. A lead storage battery is configured by fixing and accommodating the electrode plate group G by being pressed by a plurality of vertical ribs R2, R2,. In this case, the vertical rib R2 ′ projecting from the inner surface of the bulging wall b21, which is the opposing wall D of the corner b, presses the end plate n of the electrode plate group G across the cavity H. I have to. In the drawings, s is a separator, p is a positive electrode plate, and c1 is a through-hole for connection between cells.
[0003]
[Problems to be solved by the invention]
However, the cavity H, H, H, H formed inside each of the four bulged corners b, b, b, b of the battery case B of the lead storage battery A has an electrolyte solution. In addition to surplus electrolyte solution that does not significantly affect the function of the storage battery due to the injection, not only the electrolyte solution is consumed wastefully, but also an obstacle to weight reduction of the storage battery.
Also, the vertical ribs R2, R2,... And R2 ', R2',... Provided on the opposing walls D and D, respectively, are relatively difficult to remove from the mold when the width is increased. Limited to narrow width. Of the narrow vertical ribs R2, a plurality of vertical ribs R2 ′, R2 ′,... That cross the cavity H and press one side surface of the end plate n are formed on the end plate n. It protrudes comparatively long so that it may become the same claw position as vertical rib R2, R2, ... which maintains the intermediate part of the width direction. In the lead storage battery having such a configuration, the portion corresponding to the lower part of the end plate n pressed by the vertical rib R2 ′ protruding into the hollow portion H is a long-term vibration of the vehicle during use of the storage battery. The reason is unclear, as shown in FIG. 9, but it is bent inward and breaks through the separator s at the bent side edge at the bottom of the end plate n. There is a problem that a short circuit may occur with the positive electrode plate p. As a result of various studies, it has been found that the bending of the end plate n occurs particularly in the range from the lower end of the vertical rib R2 ′ to the height of 1/3 of the end plate n.
In order to eliminate the above inconvenience, the vertical rib R2 ′ protruding into the hollow portion H is eliminated, and instead, the protruding portion of the vertical rib is made thicker at one wall portion b1 of the corner portion b. Although it is conceivable, it is not preferable because it causes inconveniences such as an increase in the weight of the molding resin of the battery case and an increase in manufacturing cost.
Therefore, while preventing the above bending due to the compression of the end plate, without increasing the weight and increasing the cost due to the molding resin, the volume of the hollow portion is reduced, and the unnecessary excess electrolyte is reduced accordingly. It is desirable to develop a lead storage battery that is economical, reduces the weight of the storage battery, and eliminates all the above disadvantages.
[0004]
[Means for Solving the Problems]
The present invention provides a lead-acid battery in which the above disadvantages are eliminated, and a cell chamber in which a cavity is formed inside a corner wall that bulges outward in order to maintain a predetermined outer diameter of the battery case. A lead-acid battery comprising: a plurality of vertical ribs arranged in the width direction of the end plate against the both end plates of the electrode plate group housed in the electrode plate group; That at least the lower part of the end plate is pressed by the flat inner wall surface of the throttle wall formed by squeezing at least the lower part of the bulging wall portion of the bulging corner portion facing one end plate of the group; Features.
In this case, in the preferable lead storage battery of the present invention, the height of the flat inner wall surface of the throttle wall is at least one third of the height of the end plate of the electrode plate group from the bottom surface of the battery case. It is preferable that the height is at least equal to the range.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
One example of implementation of the lead acid battery of the present invention will be described with reference to the accompanying drawings.
1-4, L shows the lead acid battery of this invention, and the structure of a battery is not different from the conventional lead acid battery shown in FIG. As in FIG. 7, for the sake of convenience, the connecting members for connecting the electrode plate groups G in the cell chamber C in series are omitted. 1 shows the synthetic resin molding battery case. The battery case 1 is relatively lightweight and has four corner portions 2, 2, 2, and 2 at which the side wall 1a in the length direction and the side wall 1b in the width direction intersect with each other in order to maintain a predetermined outer dimension. As shown in the drawing, the machine is a bulging wall portion 1a1, 1b1 in which the respective corner wall portions 1a1, 1a1 and 1b1, 1b1 of both side walls 1a and 1b are bulged outward and the machine. A plurality of vertical ribs 3 are provided on the outer surface so as to serve as an objective reinforcement. Thus, the bulging wall portions 1a1 and 1b1 are formed inside the bulging wall portions 1a1 and 1b1 of the bulging corner portions 2, respectively.
Further, the battery case 1 is divided into six cell chambers 5 by partition walls 1c, 1c,... Crossing the inside and the inside of the cell case 1, and the electrode plate group 6 is pressed and fixed to each cell chamber 5. For example, both end plates of the electrode plate group 6 formed by alternately laminating a predetermined number of negative electrode plates n and a number of positive electrode plates p smaller than the number of the negative electrode plates n via separators s are accommodated. In the illustrated example facing the end plates n and n in order to press the negative plates n and n, the inner side walls of the side wall 1a and the partition wall 1c in the length direction are suitable in the width direction of the both end plates n and n. A plurality of vertical ribs 7, 7,... Are arranged with a certain interval, and the electrode plate group 6 is pressed and fixedly accommodated by the opposed vertical ribs 7, 7,.
In this case, the side wall of the vertical ribs 7, 7,... That presses each electrode plate group 6 accommodated in the cell chambers 5, 5,. A plurality of vertical ribs 7 ′, 7 ′, 7 ′ projecting from the inner wall surface of the bulging wall portion 1 a 1 of the bulging corner portion 2 of 1 a cross the hollow portion 4 inside thereof, and the tip thereof is Ri Do the three tip and the discomforts position of vertical ribs 7, 7, 7 projecting from the intermediate wall portion of the side wall 1a, is formed longer depth to so that to compress the end plates n the wide vertical ribs ing.
In the example shown, the bottom surface of the container 1 has been disposed saddle 1d at appropriate intervals in each of its cell chamber 5, not necessary.
The above configuration of the battery case 1 of the lead-acid battery L of the present invention is the same as that of the battery case B of the conventional lead-acid battery A, but the battery case 1 is used to eliminate the disadvantages of the conventional lead-acid battery. The feature is as follows.
That is, since the characteristic configuration is provided in the same manner in each of the four corner portions 2, 2, 2, 2, the characteristic configuration in the one corner portion 2 will be described below.
That is, as shown in the drawing, at least the lower part of the bulging wall portion 1a1 of the side wall 1a facing the one end plate n, n of the electrode plate group 6, that is, the height of the end plate n from the bottom surface of the battery case 1 is shown. A throttle wall 10 having a flat inner wall surface through a narrowing wall portion 9 that is narrowed to the inner side so as to fill the inner cavity portions 4 and 4 to a height of at least about one third of the height. And the lower surface of one end plate n of the electrode plate group 6 is pressed by the inner wall surface 10a of the diaphragm wall 10. As a specific example, the height h of the inner wall surface 10a of the throttle wall 10 from the bottom surface of the battery case 1 is 70 mm, the width W is 40 mm, and the narrowing depth d is 3.6 mm. In the illustrated example, the outer diameter dimension of the battery case in the length direction is 500 mm, the outer diameter dimension in the width direction is about 178 mm, and the height dimension is 202 mm (including the height of 20 mm of the ridge 1d ). As the end plate n of the plate group 6, those having a height of 120 mm were used. Accordingly, the lower part of the vertical rib 3 on the outer surface is formed into a wide width 3 'that is integral with the outer surface of the diaphragm wall 10 by a portion 3a corresponding to the squeezing depth d, while maintaining a prescribed outer dimension, The mechanical strength of the wall 10 was increased.
[0006]
The height of the diaphragm wall 10 may be equal to the height of the end plate n of the electrode plate group 6, or may be a diaphragm wall 10 higher than that as shown in FIG. The vertical rib 7 'may be eliminated up to a height substantially equal to the height of the battery case 1. Thus, the vertical rib 3 on the outer surface has a wide width 3 'corresponding to the throttle wall 10 so as to maintain the outer diameter of the battery case.
[0007]
Thus, since the hollow portion 4 is filled with the throttle wall 10, the waste of injecting the electrolyte solution that previously occupied the hollow portion 4 can be saved, and it is economical, and the weight of the battery is increased accordingly. Lightweight.
[0008]
In addition, the bulging corner portion 2 of the battery case 1 shows a case where both the side wall 1a in the length direction and the width direction 1b are bulged wall portions 1a1 and 1b1 in the illustrated embodiment. However, any one of the side walls not provided with the vertical ribs for compression on the inner wall surface, in the illustrated example, the corner wall portion 1b1 of the side wall 1b in the width direction is a flat side wall that does not serve as a bulging wall portion. In order to eliminate the portion and maintain the prescribed outer dimension on the outer surface, wide vertical ribs 3 ', 3', 3 'may be provided. As a result, the amount of the electrolyte can be further reduced, and a lighter lead-acid battery can be provided.
[0009]
In the above embodiment of the present invention, the end plate at both ends of the electrode plate group is applied to the compression of the electrode plate group composed of the negative electrode plate, but the same number of positive and negative electrode plates and positive electrode plates are alternately stacked via separators, Needless to say, one end plate is composed of the negative electrode plate n, and the other end plate is applicable to compression of the electrode plate group composed of the positive electrode plates p.
[0010]
【The invention's effect】
Thus, in the case according to the invention according to claim 1 of the present gun, the bottom of the bulging wall portion of the bulging corners to maintain the outer dimensions of the provisions of the container of the lead-acid battery, fill the cavity of the inner Since the diaphragm wall is provided and the end plate of the opposing electrode plate group is pressed by the flat inner wall surface, it is possible to prevent the conventional end plate from bending and breaking through the separator and short-circuiting. Since the portion is filled with the throttle wall, the wasteful electrolyte solution is eliminated, and an inexpensive and lightweight lead storage battery is provided.
In the invention according to claim 2 of the present application, the height of the flat inner wall surface of the throttle wall is at least one third of the height of the end plate of the electrode plate group from the bottom surface of the battery case. Since the lower part of the vertical rib on the outer surface is formed to have a width that is integral with the outer surface of the throttle wall corresponding to the squeezing depth, the battery case maintains the prescribed outer dimensions. In addition, the mechanical strength of the throttle wall can be increased.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of a lead-acid battery according to the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view of a lower portion of a corner portion when the lead storage battery shown in FIG. 1 is used.
4 is a longitudinal sectional view taken along line IV-IV in FIG. 3;
FIG. 5 is a view similar to FIG. 4 of another embodiment of the present invention.
6 is a cross-sectional view of a lower portion of a corner portion of a lead-acid battery similar to FIG. 3 in still another embodiment of the present invention.
FIG. 7 is a perspective view of a battery case of a conventional lead storage battery.
8 is a cross-sectional view taken along line AA in FIG.
9 is a cross-sectional view of a lower portion of a corner portion when the lead storage battery shown in FIG. 7 is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Battery case 1a1 Corner | angular wall part, bulging wall part 1b1 Corner | angular wall part, bulging wall part 2 Corner | angular part 3 Outer surface vertical rib 4 Cavity part 5 Cell chamber 6 Electrode plate group 7 Inner surface vertical rib 7 'In a cavity part Inner surface vertical rib 9 Restriction wall portion 10 Restriction wall 10a Flat inner wall surface of the restriction wall

Claims (2)

In order to maintain a predetermined outer diameter dimension of the battery case, the end is formed on the inner wall surface facing both end plates of the electrode plate group accommodated in the cell chamber in which the cavity portion is formed inside the corner wall portion bulging outward. In a lead-acid battery in which the two end plates are pressed and fixedly accommodated by a plurality of vertical ribs arranged in the width direction of the plate, a bulge of a bulging corner portion facing one end plate of the electrode plate group A lead-acid battery characterized in that at least the lower part of the end plate is pressed with a flat inner wall surface of the throttle wall formed by narrowing at least the lower part of the wall part. The height of the flat inner wall surface of the narrowed wall Ri range der to height at least equal to the height of the at least one third or more end plates of the height of the end plate of the electrode plate group from the bottom of the battery case, and the lower portion of the vertical ribs of the outer surface, lead-acid battery of claim 1 characterized in that molded into wide outer surface integral of the frequency the narrowed wall corresponding to narrowing depth.

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