JP2017139171A - Lead storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the floating of a spacer without a lead protrusion formed integrally with a lead part such as an electrode pole, and to prevent a member for suppressing the floating of the spacer from being deformed or inclined.SOLUTION: A lead storage battery comprises: an electrode plate group 2 arranged by laminating positive electrode plates 21 and negative electrode plates 22 with a separator 23 interposed therebetween; a positive electrode strap 3 to which the positive electrode plates 21 are connected; a negative electrode strap 4 to which the negative electrode plates 22 are connected; a battery case containing the electrode plate group 2 and the straps 3, 4; spacers 10 contained in the battery case 6 and serving to pressurize the electrode plate group 2 in a laminating direction; and a floating-suppressing member 11 put in contact with at least one of the straps 3, 4 and suppressing the floating of the spacers 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lead-acid battery.

  A conventional lead acid battery accommodates an electrode plate group in which a plurality of positive plates and a plurality of negative plates are stacked in a battery case. Each positive electrode plate has an ear portion formed upward from one end portion of the upper edge, and each negative electrode plate has an ear portion formed upward from the other end portion of the upper edge. And the ear | edge part of each positive electrode plate is connected to the strip | belt-shaped positive electrode strap along the lamination direction of an electrode group, and the ear | edge part of each negative electrode plate is a strip | belt-shaped negative electrode strap along the lamination direction of an electrode group. It is connected to the. A positive pole is connected to the positive strap, and a negative pole is connected to the negative strap.

  Some lead storage batteries include a spacer that pressurizes the active material of the electrode plate group in the stacking direction between the outermost surface in the stacking direction of the electrode plate group and the inner surface of the battery case. This spacer is provided in order to make it difficult for the charge / discharge performance to be lowered due to dropping of the active material.

  However, the spacer may be lifted by buoyancy received from the electrolytic solution or vibration during transportation or use. If the spacer is lifted excessively, for example, beyond the design assumption, the active material under the electrode plate group may not be sufficiently pressurized, and the charge / discharge performance may be degraded due to the falling off of the active material.

  Therefore, in the lead-acid battery of Patent Document 1, the spacers located below the splash-proof body are lifted by pressing the splash-proof body arranged on the top surface of the electrode plate group by the bottom face of the positive electrode pillar and the bottom face of the negative electrode pillar. I try to suppress it.

JP 59-33752 A

  However, since the splash-proof body is pressed only at two points on each pole column, the splash-proof body is likely to be deformed or tilted by the buoyancy of the spacer applied to the splash-proof body. If it does so, the press of the spacer by a splash-proof body will become inadequate.

  Accordingly, the present invention has been made to solve the above-mentioned problems, and it is a main object of the present invention to prevent the spacer from rising and to make it difficult to cause deformation and inclination of a member that suppresses the spacer from rising. It is.

  That is, the lead storage battery according to the present invention includes an electrode plate group in which a plurality of positive plates and a plurality of negative plates are stacked via a separator, a positive strap to which the plurality of positive plates are connected, and the plurality of negative plates. A negative electrode strap to be connected, a battery case that accommodates the electrode plate group and the straps, a spacer that is accommodated in the battery case and pressurizes the electrode plate group in a stacking direction, and contacts with the at least one strap And a lift suppressing member that suppresses the lift of the spacer.

  If it is this lead acid battery, the lift of a spacer can be suppressed by the lift suppression member. In particular, since the lifting restraining member is configured to contact the strap, the lifting restraining member can be brought into contact, for example, from one end to the other in the stacking direction on the lower surface of the belt-like strap, and the contact area between the lifting restraining member and the strap. Can be increased. Since the contact area can be increased in this way, the lift suppression member is less likely to be deformed or tilted even when subjected to the buoyancy of the spacer.

In some lead acid batteries, at least one of the straps has an extending portion that extends in a width direction perpendicular to the stacking direction from the ear portion of the electrode plate connected to the strap.
By disposing at least a part of the lifting restraining member below the extending portion, the existing strap configuration can be used effectively, and the lifting of the spacer can be suppressed without changing the shape of the strap. In addition, since the lifting restraining member is disposed below the extending portion extending in the width direction from the ear portion, the lifting restraining member may be disposed under the strap without any difficulty in the ear portion. it can.

The extending portion is usually formed from one end to the other end of the at least one strap in the stacking direction. In order to prevent the lifting restraining member from being caught on the upper surface of the electrode plate group during assembly and to be easily attached to the lower part of the extension portion and to prevent the electrode plate group from being damaged, the lifting restraining member is provided with the extension portion. It is conceivable to have a configuration in which a rattling is provided below the sway.
In this configuration, the spacer is provided between the outermost surface in the stacking direction of the electrode plate group and the inner surface of the battery case, and the lift suppression member is disposed below the extension portion and above the spacer. In this case, when the lifting restraining member receives the buoyancy of the spacer, the lifting restraining member is inclined and the upper surface thereof is in contact with the lower surface of the extending portion. At this time, if the inclination angle of the lifting suppression member is large, the lifting of the spacer may not be sufficiently suppressed.
In order to suitably solve this problem, it is desirable that the lifting restraining member is disposed from one end lower side to the other end lower side of the extending portion and above the spacer.
If it is this structure, the dimension in the lamination direction of a floating suppression member can be lengthened, and the inclination angle at the time of inclining by receiving the buoyancy of a spacer can be made small. Thereby, the floating of a spacer can be suppressed reliably.

As described above, when the lifting suppression member is arranged with rattling below the strap, the lifting suppression member moves up and down due to the rattling. Therefore, when the lift suppression member receives the buoyancy of the spacer, it moves upward, and there is a possibility that the active material of the electrode plate group is exposed from the lower end of the spacer in a state where the lift of the spacer is suppressed.
In order to solve this problem suitably, the looseness of the lifting suppression member is such that the active material of the electrode plate group is released from the spacer in a state where the lifting suppression member is in contact with the lower surface of the strap and presses the spacer. It is desirable that it is set not to be exposed.
With this configuration, it is possible to suppress the spacer from rising within a range in which the charge / discharge performance is not deteriorated due to dropping of the active material.

When the lifting restraining member is disposed only below one strap, the lifting restraining member moves in the width direction perpendicular to the stacking direction due to external vibration or the buoyancy of the spacer, and comes off from below the strap. There is a possibility that the lift of the spacer cannot be suppressed.
In order to preferably solve this problem, the lifting suppression member includes a positive electrode side arrangement portion arranged below the positive electrode strap, a negative electrode side arrangement portion arranged below the negative electrode strap, and the positive electrode side. It is desirable to have an arrangement part and a connecting part for connecting the negative electrode side arrangement part.
With this configuration, the arrangement portions connected to each other are arranged below the straps, so that the floating suppression member is surrounded by the positive electrode strap, the positive electrode plate ear portion, the negative electrode strap, and the negative electrode plate ear portion. In other words, even if it receives vibration from the outside or the buoyancy of the spacer, the lifting restraining member is unlikely to come off from the lower side of the strap, and can be held below the strap.

In order to adjust the looseness of the lifting restraining member, it is conceivable to integrally form a convex portion protruding downward from the strap. However, in this case, the amount of lead used increases and the material cost increases. . In addition, the distance between the projection and the electrode plate becomes small at the initial stage, and it becomes easy to short-circuit when the electrode plate is extended by use.
In order to adjust the rattling of the lifting restraining member while preferably solving this problem, it is desirable that the positive electrode side arrangement part and the negative electrode side arrangement part have a convex part protruding upward or downward. .
With this configuration, the looseness of the lifting restraining member below the strap can be adjusted depending on the height of the convex portion, and compared to a configuration in which the entire lifting restraining member is adjusted to adjust the rattling. The material cost of the member can also be suppressed. Here, in the case of the configuration in which the convex portion protrudes upward, the portion other than the convex portion in the lifting restraining member can be separated from the strap, and the lead peeling material generated from the lead parts such as each strap or each pole column is restrained from lifting. Even if it is deposited on the upper surface of the member, it is possible to make it difficult to cause a short circuit between the positive pole (or positive strap) and the negative pole (or negative strap).

  Further, in order to adjust the backlash of the lifting suppression member over the entire stacking direction, the convex portion is formed from one end to the other end of the positive electrode side arrangement portion and the negative electrode side arrangement portion in the stacking direction. It is desirable that With this configuration, the mechanical strength of the lifting restraining member can be further increased. In addition, when the lifting suppressing member is made of a material that can be bent such as resin, the convex portion can be formed by bending, and the processing cost can be reduced.

As described above, the lifting suppression member has a configuration in which the positive electrode side arrangement portion and the negative electrode side arrangement portion are connected to each other by the connection portion, or by providing a convex portion in each arrangement portion, the floating suppression member is suppressed below the strap. The backlash of the member is reduced. However, in this configuration, the lead peeled matter generated from the lead component is unlikely to fall from the upper surface of the lift suppressing member, and the lead peeled matter tends to be deposited on the upper surface of the lift suppressing member, which may promote a short circuit due to the lead peeled material. In particular, in the case where the convex portion protrudes upward, the convex portion disturbs the fall of the lead stripped material, and this problem may become remarkable.
In order to suitably prevent a short circuit due to the lead stripped material, it is desirable that the connecting portion has a partitioning portion projecting in an upward direction that partitions the upper surface between the positive strap side and the negative strap side.
If it is this structure, since the lead peeling thing deposited on the upper surface of the floating suppression member by a partition part becomes difficult to connect between a positive pole (or positive strap) and a negative pole (or negative strap), it is a short circuit by a lead peeling thing. Can be prevented.

  Moreover, in order to further prevent a short circuit due to the lead stripped material, it is desirable that the partition portion is formed from one end of the connecting portion to the other end in the stacking direction. In addition, when the connection part of a floating suppression member is the material which can be bent, such as resin, the said partition part can be formed by a bending process. As a result, the lifting restraining member can be easily bent or bent starting from the partition portion, and if the lifting restraining member is bent or curved when the lifting restraining member is inserted below the strap, the lifting work can be facilitated. it can.

  When the battery case is formed of a material having translucency, the inside of the battery case becomes visible. If it does so, there exists a possibility of damaging the external appearance of a battery by the floating of a spacer, dropping of the active material which may arise in connection with it. In the present invention, since the lift of the spacer is suppressed by the lift suppression member, it is possible to make it difficult to impair the battery appearance.

  According to the present invention configured as described above, not only the lifting of the spacer is suppressed, but also the lifting suppressing member is in contact with the strap to suppress the lifting of the spacer. Inclination can be made difficult to occur.

It is a front sectional view showing typically the composition of the lead acid battery of this embodiment. It is side surface sectional drawing which shows typically the structure of the lead storage battery of the embodiment. It is a fragmentary top view of the state where the lid of the embodiment was removed. It is the top view and front view of the lifting suppression member of the same embodiment. It is a schematic diagram which shows the relationship between the strap in the same embodiment, a floating suppression member, and a spacer. It is a schematic diagram which shows the relationship between the strap in the same embodiment, a floating suppression member, and a spacer. It is the top view and front view which show the modification of a floating suppression member. It is the top view and front view which show the modification of a floating suppression member. It is the top view and front view which show the modification of a floating suppression member. It is a top view which shows the modification of a floating suppression member. It is a schematic diagram which shows the modification of a floating suppression member.

  Hereinafter, an embodiment of a lead storage battery according to the present invention will be described with reference to the drawings.

  The lead storage battery 100 according to the present embodiment is of a liquid type, and as shown in FIGS. 1 and 2, an electrode plate group 2 having a positive electrode plate 21 and a negative electrode plate 22, and a positive electrode plate 21 of the electrode plate group 2. Are connected to each other, a negative electrode strap 4 to which the negative electrode plate 22 of the electrode plate group 2 is connected, and a battery case 6 that accommodates the electrode plate group 2 and the straps 3 and 4 together with the electrolyte 5. Yes.

  The electrode plate group 2 is formed by alternately laminating a plurality of positive electrode plates 21 and a plurality of negative electrode plates 22 through a separator 23 made of a porous body so as to have a rectangular parallelepiped shape.

  The positive electrode plate 21 is obtained by filling and holding a positive electrode active material in a lattice-shaped frame (positive electrode lattice) made of, for example, a lead alloy. The positive electrode plate 21 has a current collecting ear portion 211 connected to the positive electrode strap 3 at one end portion of the upper edge thereof. Further, the negative electrode plate 22 is obtained by filling and holding a negative electrode active material in a lattice-shaped frame (negative electrode lattice) made of, for example, a lead alloy. The negative electrode plate 22 has a current collecting ear 221 connected to the negative electrode strap 4 at the other end of the upper edge.

  In addition, in the width direction orthogonal to the stacking direction, the plurality of positive electrode plates 21 and the plurality of negative electrode plates 22 have the ears 211 of the positive electrode plate 21 on one side and the ears 221 of the negative electrode plate 22 on the other side. Laminated so that. In the following, the stacking direction of the electrode plate group 2 is also referred to as the front-rear direction, and the width direction orthogonal to the stacking direction is also referred to as the left-right direction.

  The positive strap 3 collects current by integrating the ears 211 of the plurality of positive plates 21. As shown in FIGS. 1 and 3, the positive electrode strap 3 has a band shape in plan view, and extends from one end to the other end in the stacking direction of the electrode plate group 2 on one side in the width direction of the electrode plate group 2. It extends in a straight line.

  Further, the positive strap 3 has an extending portion 31 that extends inward in the width direction from the ear portion 211 of the positive electrode plate 21. The extending portion 31 is formed continuously from one end to the other end in the stacking direction of the electrode plate group 2.

  A positive pole 7 is connected to the upper part of the positive strap 3. In the present embodiment, the pole column seat portion 32 is formed so as to protrude inward in the width direction of the positive electrode strap 3 (specifically, the extension portion 31). A positive pole 7 is connected to the upper surface of the. In addition, the structure which does not have the pole column seat part 32, and connects the positive electrode column 7 to the upper surface of the positive electrode strap 3 may be sufficient.

  The negative electrode strap 4 collects current by integrating the ears 221 of the plurality of negative electrode plates 22. As shown in FIGS. 1 and 3, the negative electrode strap 4 has a band shape in a plan view, and extends from one end to the other end in the stacking direction of the electrode plate group 2 on the other side in the width direction of the electrode plate group 2. It extends in a straight line.

  Further, the negative electrode strap 4 has an extending portion 41 that extends inward in the width direction from the ear portion 221 of the negative electrode plate 22. The extending portion 41 is formed continuously from one end to the other end in the stacking direction of the electrode plate group 2.

  A negative pole 8 is connected to the upper part of the negative strap 4. In the present embodiment, the pole column seat portion 42 is formed so as to protrude inward in the width direction of the negative electrode strap 4 (specifically, the extension portion 41), and the upper surface of the extension portion 41 and the pole column seat portion 42. A negative pole 8 is connected to the upper surface. In addition, the structure which does not have the pole column seat part 42, but connects the negative electrode pillar 8 to the upper surface of the negative electrode strap 4 may be sufficient.

  The battery case 6 has a rectangular parallelepiped box shape having an opening in the upper portion, and the upper opening is closed by a lid 9. The battery case 6 of the present embodiment is formed from a light-transmitting material (for example, a transparent resin) so that an internal state of an electrolyte solution or the like can be visually recognized. Further, although not shown, a side surface of the battery case 6 is provided with a maximum liquid level line indicating the upper limit of the liquid level height of the electrolytic solution 5 and a minimum liquid level line indicating the lower limit of the liquid level height of the electrolytic solution 5. ing.

  And in the lead storage battery 100 of this embodiment, as shown in FIG.1 and FIG.2, the spacer 10 which pressurizes the electrode group 2 in a lamination direction, and the lift suppression member 11 which suppresses the lift of this spacer 10 are provided. ing.

  The spacer 10 is accommodated in the battery case 6, and is specifically provided between the outer side surface 2 a in the stacking direction of the electrode plate group 2 and the inner side surface 6 a of the battery case 6. The spacer 10 of the present embodiment is a rectangular flat plate formed from expanded polystyrene. Although the polystyrene foam has a specific gravity smaller than that of the electrolytic solution and easily floats due to buoyancy received from the electrolytic solution or vibration during transportation or use, the spacer 10 can be configured at low cost.

  The spacer 10 covers the entire surface of the active material of the electrode plate (in this embodiment, the negative electrode plate 22) located on the outermost side in the stacking direction of the electrode plate group 2, and the electrode plate positioned on the outermost side is positioned on the inner side in the stacking direction. To press. The spacers 10 are provided on both sides of the electrode plate group 2 in the stacking direction, but may be provided only on one side of the electrode plate group 2 in the stacking direction. Moreover, the structure which pressurizes the electrode group 2 in the lamination direction by arrange | positioning the spacer 10 inside the electrode group 2 may be sufficient.

  The lifting restraining member 11 is separate from the straps 3 and 4, and comes into contact with the straps 3 and 4 to restrain the spacer 10 from lifting. The lifting suppression member 11 is made of a material having corrosion resistance with respect to the electrolytic solution 5 and is made of a resin such as polypropylene (PP), for example.

  Specifically, the lifting restraining member 11 is provided from below the positive strap 3 to below the negative strap 4 and is disposed above the spacer 10 to cover the spacer 10. The lifting restraining member 11 of the present embodiment is provided between the electrode plate group 2 and the positive electrode strap 3 and between the electrode plate group 2 and the negative electrode strap 4.

  Here, between the electrode plate group 2 and the straps 3 and 4 is between the electrode plate group 2 and the extending portions 31 and 41 of the straps 3 and 4, and more specifically, the electrode plate group 2. And the lower surfaces of the extending portions 31 and 41 facing the upper surface of the electrode plate group 2. The upper surface of the electrode plate group 2 is formed by the separator 23 because the separator 23 extends above the upper sides of the electrode plates 21 and 22 in this embodiment.

  As shown in FIG. 4, the lifting restraining member 11 of the present embodiment has a rectangular shape in plan view, and one end portion (left end portion) 11 a in the width direction is an extended portion of the electrode plate group 2 and the negative electrode strap 4. 41 is a negative electrode side arrangement part arranged between the electrode plate group 2 and the extension part 31 of the positive electrode strap 3. . Moreover, the part between the negative electrode side arrangement | positioning part 11a and the positive electrode side arrangement | positioning part 11b becomes the connection part 11m which connects them.

  With this configuration, the area from the ear portion 211 of the positive electrode plate 21 to the ear portion 221 of the negative electrode plate 22 is covered with the floating suppression member 11 on the upper surface of the electrode plate group 2. Thereby, the floating suppression member 11 functions as a protective cover for protecting the electrode plate group 2 at the time of specific gravity measurement or water replenishment work.

  Further, the floating suppression member 11 is formed with a plurality of circular through holes 11h, for example. The through hole 11h makes it easier for the electrolyte 5 to reach the electrode plate group 2 side during rehydration. Moreover, the lead peeled material peeled off from the straps 3, 4, etc. can easily fall to the electrode plate group 2 side through the through-holes 11 h, and it is possible to make it difficult to deposit the lead peeled material on the upper surface of the lifting suppressing member 11.

  Further, in the state in which the lifting suppression member 11 is disposed between the electrode plate group 2 and the extending portions 31 and 41 of the straps 3 and 4, both end portions 11c and 11d in the stacking direction (front-rear direction) are the electrode plate group. It extends outside of 2. This extended portion serves as a spacer cover that covers all or part of the spacer 10 vertically above.

  That is, the dimension in the front-rear direction of the lifting suppression member 11 is set to be larger than the dimension in the stacking direction of the electrode plate group 2. Of course, the dimension in the front-rear direction of the lifting suppression member 11 is set smaller than the dimension in the front-rear direction of the internal space of the battery case 6. Here, for example, in the state in which the front end portion 11 c is in contact with the inner side surface of the battery case 6, the lifting suppression member 11 has dimensions in the front-rear direction so that the rear end portion 11 d covers the spacer 10. .

  The lifting suppression member 11 has a convex portion 111 on each of the negative electrode side arrangement portion 11a and the positive electrode side arrangement portion 11b located between the electrode plate group 2 and the extending portions 31 and 41 of the straps 3 and 4.

  This convex part 111 is formed along the front-back direction, and protrudes upward in this embodiment. Specifically, the convex portion 111 is continuously formed from one end to the other end of each of the straps 3 and 4 along the front-rear direction. In this embodiment, the convex part 111 is continuously formed from one end of each arrangement | positioning part 11a, 11b along the front-back direction from the other end.

  Further, the lifting restraining member 11 has a partition portion 112 that divides the upper surface between the positive strap 3 side and the negative strap 4 side.

  The partition portion 112 is formed along the front-rear direction and protrudes upward. Moreover, the partition part 112 is formed in the connection part 11m which connects the negative electrode side arrangement | positioning part 11a and the positive electrode side arrangement | positioning part 11b of the floating suppression member 11, and it continues from the one end of the connection part 11m to the other end along the front-back direction. Is formed. In addition, the height dimension of the partition part 112 is a grade which does not produce a short circuit with a lead peeling material, for example, is set based on the deposit amount of the lead peeling material assumed.

  The lifting restraining member 11 configured as described above has a convex portion 111 formed by bending both end portions of a resin flat plate such as polypropylene, and the partition portion 112 by bending the central portion thereof. Is formed. That is, the lifting restraining member 11 of the present embodiment has a bent cross-sectional shape. As the bending process, for example, a press process can be considered.

Moreover, each arrangement | positioning part 11a, 11b of the floating suppression member 11 is arrange | positioned with the backlash under the extension parts 31 and 41 of each strap 3 and 4 (refer FIG. 5 (A)). Further, the rattling occurs when the arrangement portions 11a and 11b of the lifting suppression member 11 are in contact with the lower surfaces of the straps 3 and 4 and press the spacer 10 (see FIG. 5B), from the spacer 10 to the electrode plate group. The active material 2 is set so as not to be exposed. Since the lifting restraining member 11 has a symmetrical shape on the negative strap 4 side and the positive strap 3 side, FIG. 5 shows the positional relationship on the negative strap 4 side.
Note that, due to the rattling, a vertical gap S <b> 1 is formed between the arrangement portions 11 a and 11 b of the lifting suppression member 11 and the lower surfaces of the extending portions 31 and 41. In the present embodiment, since the upper side of the spacer 10 is located at a position lower than the upper surface of the electrode plate group 2, the gap S1 has a height dimension in the front view of each of the arrangement portions 11a and 11b of the lift suppression member 11 and the extension. This is the difference between the distance between the lower surfaces of the protruding portions 31 and 41 and the upper surface of the electrode plate group 2.

  The vertical gap S1 is formed between the spacer 10 and the electrode plate in a state in which the placement portions 11a and 11b of the lifting suppression member 11 are in contact with the lower surfaces of the extension portions 31 and 41 of the straps 3 and 4 and hold the spacer 10 in place. The active material of group 2 is set not to be exposed.

  The gap S1 of the present embodiment is larger than the amount of protrusion of the spacer 10 from the upper surface of the electrode plate group 2 (the allowable lifting amount L1) when the lower side of the spacer 10 is at the same height as the lower end of the active material of the electrode plate. small. When the lower side of the spacer 10 is higher than the lower end of the active material of the electrode plate, a part of the active material is exposed on the lower side of the spacer 10, and the pressure on the exposed portion is insufficient. There is a risk that the charge / discharge performance may be degraded due to the fall of the active material. For this reason, it is desirable to set the gap S1 as described above.

  By making the gap S1 in the vertical direction smaller than the allowable lifting amount L1, the arrangement portions 11a and 11b of the floating suppression member 11 are in contact with the extended portions 31 and 41 of the spacer 10 and the straps 3 and 4, respectively. (See FIG. 5B), the amount L of the spacer 10 protruding from the upper surface of the electrode plate group 2 is smaller than the allowable lifting amount L1.

When the upper side of the spacer 10 is higher than the upper surface of the electrode plate group 2 in the state before the spacer 10 is lifted, the vertical gap S <b> 1 is formed by the arrangement portions 11 a and 11 b of the lift suppressing member 11. And the distance between the lower surfaces of the extending portions 31 and 41 and the upper surface of the spacer 10. In this case, the vertical gap S1 also extends from the spacer 10 in a state where the placement portions 11a and 11b of the lifting suppression member 11 are in contact with the lower surfaces of the extension portions 31 and 41 of the straps 3 and 4 and hold the spacer 10 in place. It is set so that the active material of the plate group 2 is not exposed.
On the other hand, when the height dimension of the spacer 10 is small, the lower side of the spacer 10 is positioned higher than the lower end of the active material of the electrode plate when the upper side of the spacer 10 protrudes from the upper surface of the electrode plate group 2. There is a case. In this case, it is conceivable that the vertical gap S1 is not provided, or the vertical gap S1 is set to a predetermined value.

Further, by having the vertical gap S <b> 1, the lifting suppression member 11 may be inclined between the extended portions 31 and 41 of the straps 3 and 4 and the electrode plate group 2. Further, the lifting suppression member 11 may move in the front-rear direction due to a gap formed between the lifting suppression member 11 and the inner surface of the battery case in the front-rear direction. Therefore, as shown in FIG. 6, the horizontal direction generated between the inner side surface 6 a of the battery case 6 and the front end portion 11 c or the rear end portion 11 d of the lifting suppression member 11 due to the inclination of the lifting suppression member 11 or the movement in the front-rear direction. It is necessary to set the vertical direction gap S1 and the front-rear dimension of the lifting suppression member 11 so that the gap S2 is less than the thickness W of the spacer 10. FIG. 6 shows the positional relationship on the negative strap 4 side.
In addition, although the arrangement portions 11a and 11b of the lifting suppression member 11 have a backlash in the width direction between the ear portions 211 and 221 below the extending portions 31 and 41 of the straps 3 and 4, The backlash in the width direction is set so that the arrangement portions 11 a and 11 b of the lifting suppression member 11 are not moved from the extended portions 31 and 41 of the straps 3 and 4 and moved above the straps 3 and 4.

Next, the operation of the lifting suppression member 11 configured as described above will be described.
For example, when one of the spacers 10 is lifted, the upper side of the spacer 10 is lifted and contacts the lower surface of the restraining member 11. In the present embodiment, the spacer 10 is in contact with the lower surface of the negative electrode side arrangement portion 11a and the lower surface of the positive electrode side arrangement portion 11b of the lifting suppression member 11. Then, the lifting restraining member 11 is lifted with the rise of the spacer 10, and the lower surface of the negative electrode side arrangement portion 11 a and the upper surface of the positive electrode side arrangement portion 11 b (upper surface of the convex portion 111) are extended portions 31 of the straps 3 and 4. , 41 (see FIG. 5B). Thereby, the spacer 10 is restrained from further lifting. Note that the clearance between the one end 11c of the lifting suppression member 11 and the inner side surface 6a of the battery case 6 increases due to the tilting suppression member 11 being inclined, but the left-right clearance S2 is the thickness W of the spacer 10. Therefore, the spacer 10 does not further float through the gap S2.

  According to the lead storage battery 100 according to the present embodiment configured as described above, the lifting of the spacer 10 can be suppressed by the lifting suppression member 11. In particular, since the lifting restraining member 11 is in contact with the straps 3 and 4, the lower surface of the belt-like straps 3 and 4 can be brought into contact from one end to the other in the stacking direction. The contact area with 4 can be increased. By increasing the contact area in this manner, the lifting suppression member 11 is less likely to be deformed or inclined even when subjected to the buoyancy of the spacer 10.

  Moreover, since the battery case 6 is formed of a transparent resin so that the inside can be visually recognized, the rise of the spacer 10 is suppressed by the lift suppression member 11, so that the appearance of the battery can be hardly damaged.

  In addition, since the lifting restraining member 11 is disposed below the extended portions 31 and 41 extending inward in the width direction from the ear portions 211 and 221, the existing strap configuration can be effectively utilized, and the straps 3 and 4 can be used. The floating of the spacer 10 can be suppressed without changing the shape. In addition, the lifting restraining member 11 can be disposed under the straps 3 and 4 without difficulty, without the ears 211 and 221 interfering with each other. Here, since the lifting restraining member 11 is disposed from the lower end of one end of the extending portions 31 and 41 to the lower end of the other end and disposed above the spacer 10, the inclination when tilted by receiving the buoyancy of the spacer 10. The angle can be reduced, and the floating of the spacer 10 can be reliably suppressed.

  Since the floating suppression member 11 includes the negative electrode side arrangement portion 11 a and the positive electrode side arrangement portion 11 b, the floating suppression member 11 includes the positive electrode strap 3, the ear portion 211 of the positive electrode plate 21, the negative electrode strap 3, and the ear portion 221 of the negative electrode plate 22. Even if it receives vibration from the outside or the buoyancy of the spacer 10, the lifting restraining member 11 does not easily come off from below the straps 3, 4 and does not come off from below the straps 3, 4. Can be kept down.

  Since the lifting restraining member 11 is configured to be rattled below the straps 3 and 4, the lifting restraining member 11 can be easily mounted below the straps 3 and 4 and the electrode plate group 2 can be hardly damaged. At this time, the looseness of the lifting restraining member 11 is set so that the active material of the electrode plate group 2 is not exposed from the spacer 10 in a state where the lifting restraining member 11 is in contact with the lower surfaces of the straps 3 and 4 and presses the spacer 1. Therefore, the spacer can be prevented from rising in a range in which the charge / discharge performance is not deteriorated due to dropping of the active material.

  Since the positive electrode side arrangement part 11b and the negative electrode side arrangement part 11a have the convex part 111, the looseness of the floating suppression member 11 below the straps 3 and 4 can be adjusted by the height dimension of the convex part 111, and the floating suppression is performed. Compared to a configuration in which the entire member 11 is thickened to adjust the backlash, the material cost of the lifting suppression member 11 can be suppressed. Further, it is not necessary to integrally form a convex portion that protrudes downward from the strap, and an increase in the amount of lead used and the accompanying increase in material cost can be suppressed. Furthermore, since the convex part 111 is formed over the whole lamination direction, the mechanical strength of the floating suppression member 11 can also be increased. At this time, the convex part 111 is the structure which protruded upwards, parts other than the convex part 111 can be separated from the straps 3 and 4, and the short circuit by the deposited lead peeling thing can be prevented. Moreover, since the lifting suppression member 11 is made of resin and the convex portion 111 can be formed by bending, the processing cost can be reduced.

  Since the connection part 11m between the positive electrode side arrangement | positioning part 11b and the negative electrode plate arrangement | positioning part 11a has the partition part 112, the short circuit by the lead peeling material deposited on the upper surface of the floating suppression member 11 can be prevented. Further, the mechanical strength of the lifting restraining member 11 can be increased. Here, since the partition part 112 is formed from one end to the other end of the connecting part 11m in the stacking direction, it is possible to more reliably prevent a short circuit due to the lead stripped material deposited on the upper surface of the lifting restraining member 11. . Further, the lifting restraining member 11 can be easily bent or bent with the partition 112 as a starting point. When the lifting restraining member 11 is bent or bent when the lifting restraining member 11 is inserted below the straps 3 and 4, the lifting restraining member 11 is inserted. Work can also be facilitated.

  The present invention is not limited to the above embodiment.

  As far as the lifting suppression member 11 is concerned, it is not limited to the shape of the above embodiment as long as the lifting of the spacer 10 can be suppressed using the straps 3 and 4.

  For example, as shown in FIG. 7, the lifting suppression member 11 includes a rectangular flat plate portion 110, a left end portion 110 a serving as a negative electrode side arrangement portion of the flat plate portion 110, and a right end portion 110 b serving as a positive electrode side arrangement portion. You may have the convex part 111 which protruded upwards, and the partition part 112 which protruded upwards from the horizontal direction center part (connection part which connects each arrangement | positioning part) of the flat plate part 110. FIG. In FIG. 7, the convex portion 111 and the partition portion 112 protrude from the flat plate portion 110 in the vertical direction, but may be inclined and protrude from the vertical direction. Further, the convex portion 111 may protrude downward from the left and right end portions 110 a and 110 b of the flat plate portion 110.

  The convex portion 111 is not limited to one that is continuously formed from one end in the front-rear direction to the other end of the connecting portion 11m in the lifting restraining member 11, and as shown in FIG. It may be partially formed between them. At this time, in order to increase the number of contact points with the lower surfaces of the straps 3 and 4 and improve the stability of the lifting restraining member 11, a plurality of convex portions 111 are intermittently formed between one end and the other end in the front-rear direction. Is desirable.

  The partition 112 is not limited to one, and a plurality of partitions 112 may be formed. In this case, the plurality of partition portions 112 may have the same shape or different shapes. Further, as shown in FIG. 9, a wave shape such as a sine wave, a rectangular wave, a triangular wave, or a sawtooth wave is formed on the upper surface of the lifting suppression member 11, and a plurality of convex portions of the wave shape are used as a plurality of partition portions 112. good.

  As shown in FIG. 10, the floating suppression member 11 has a rectangular shape in plan view, and as shown in FIG. 10, the positive electrode side arrangement portion 11 a arranged below the positive electrode strap 3 and the negative electrode side arrangement portion arranged below the negative electrode strap. If it has 11b, the connection part 11m which connects the positive electrode side arrangement | positioning part 11a and the negative electrode side arrangement | positioning part 11b, and the spacer cover part 11n which covers the upper part of the spacer 10, it will not be restricted to a planar view rectangular shape. In addition, in FIG. 10, although the case where the connection part 11m and the spacer cover part 11n are formed integrally is shown, you may comprise separately.

  Further, the lifting suppression member 11 is provided between the electrode plate group 2 and the positive electrode strap 3 in addition to those provided between the electrode plate group 2 and the positive electrode strap 3, and between the electrode plate group 2 and the positive electrode strap 3, and It may be provided between the electrode plate group 2 and the negative electrode strap 4 or in any one of them.

  Furthermore, the lifting restraining member 11 is not limited to an integral configuration, and may be composed of a plurality of parts. In this case, for example, the lifting restraining member 11 may be configured by assembling the parts constituting the convex part 111 and the parts constituting the partition part 112.

  In addition, the lifting suppression member 11 may be configured without the convex portion 111. In this case, for example, it is conceivable to increase the lifting suppression member 11.

  Furthermore, the lifting suppression member 11 may be configured without the partition 112 (see FIG. 10). In this case, the lifting suppression member 11 may have a short-circuit prevention unit other than the partition unit 112. As this short circuit prevention part, it is the opening 11K comprised so that a lead peeling material might fall directly on the electrode group 2 upper surface, for example. Moreover, it is good also as a short circuit prevention part by enlarging the opening shape of the through-hole 11h formed in the floating suppression member 11. FIG.

In addition, in the above-described embodiment, the lifting suppression member 11 is interposed between the straps 3, 4 and the spacer 10 by providing the lifting suppression member 11 between the electrode plate group 2 and the straps 3, 4. However, a configuration may be adopted in which the lifting suppression member 11 is provided between the straps 3 and 4 and the spacer 10 without being provided between the electrode plate group 2 and the straps 3 and 4.
For example, as shown in FIG. 11, the lifting suppression member 11 has one end in contact with the stacking direction end portions 3 a and 4 a of the straps 3 and 4 and the other end in contact with the upper end portion 10 a of the spacer 10. Also good. In FIG. 11, the lifting restraining member 11 includes a mounting portion 113 that is mounted on the end portion 3 a of the straps 3 and 4, and a mounting portion 113 that is provided on the mounting portion 113 and disposed above the spacer 10. The structure which has the spacer cover part 114 which covers one part is shown.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Lead acid battery 2 ... Electrode plate group 21 ... Positive electrode plate 22 ... Negative electrode plate 23 ... Separator 3 ... Positive electrode strap 31 ... Extension part 4 ... Negative electrode strap 41・ ・ ・ Extension part 6 ・ ・ ・ Battery case 10 ・ ・ ・ Spacer 11 ・ ・ ・ Lifting suppression member 11 a ・ ・ ・ Negative electrode side arrangement part 11 b ・ ・ ・ Positive electrode side arrangement part 11 m ・ ・ ・ Connection part 111 ・ ・ ・Convex part 112 ... partition part

Claims (10)

An electrode plate group in which a plurality of positive electrode plates and a plurality of negative electrode plates are laminated via a separator;
A positive strap to which the plurality of positive plates are connected;
A negative strap to which the plurality of negative plates are connected;
A battery case for housing the electrode plate group and the straps;
A spacer housed in the battery case and pressurizing the electrode plate group in the stacking direction;
A lead-acid battery comprising: a lift suppressing member that contacts the at least one strap and suppresses the lift of the spacer. The at least one strap has an extending portion in the width direction perpendicular to the stacking direction from the ear portion of the electrode plate connected to the strap,
The lead acid battery according to claim 1, wherein at least a part of the lifting suppression member is disposed below the extending portion. The extending portion is formed from one end to the other end of the at least one strap in the stacking direction,
The spacer is provided between the outermost surface in the stacking direction of the electrode plate group and the inner surface of the battery case,
The lead storage battery according to claim 2, wherein the lifting restraining member is disposed with a backlash from a lower end of the extension part to a lower end of the other end and is disposed above the spacer. The lifting restraining member is arranged with a backlash below the strap,
The rattling of the lifting restraining member is set so that the active material of the electrode plate group is not exposed from the spacer in a state where the lifting restraining member contacts the lower surface of the strap and presses the spacer. Or the lead acid battery of 2. The lifting restraining member is
A positive electrode side arrangement portion arranged below the positive electrode strap;
A negative electrode side arrangement portion arranged below the negative electrode strap;
The lead acid battery according to claim 1, 2, 3, or 4, further comprising a connecting portion that connects the positive electrode side arrangement portion and the negative electrode side arrangement portion.   The lead acid battery according to claim 5, wherein the positive electrode side arrangement part and the negative electrode side arrangement part have a convex part protruding upward or downward.   The lead storage battery according to claim 6, wherein the convex portion is formed from one end to the other end of the positive electrode side arrangement portion and the negative electrode side arrangement portion in the stacking direction.   The lead-acid battery according to claim 5, 6 or 7, wherein the connecting part has a partition part protruding upward in order to partition the upper surface between the positive strap side and the negative strap side.   The lead storage battery according to claim 8, wherein the partition portion is formed from one end to the other end of the connecting portion in the stacking direction.   The lead-acid battery according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9, wherein the battery case is formed of a material having translucency.