JP6651882B2 - Lead storage battery - Google Patents

Description

  The present invention relates to a lead storage battery.

  2. Description of the Related Art A conventional lead-acid battery contains an electrode 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 formed upward from one end of the upper edge, and each negative electrode plate has an ear formed upward from the other end of the upper edge. The ears of each positive electrode plate are connected to a band-shaped positive electrode strap along the direction of lamination of the electrode group. It is connected to the. Further, a positive pole is connected to the positive strap, and a negative pole is connected to the negative strap.

  Some lead storage batteries are provided with a spacer for pressing the active material of the electrode group in the stacking direction between the outermost surface of the electrode group in the stacking direction and the inner surface of the battery case, for example. The spacer is provided in order to prevent the deterioration of the charge / discharge performance due to the falling off of the active material or the like.

  However, the spacer may float due to buoyancy received from the electrolyte or vibration during transportation or use. If the spacers are raised more than expected, for example, as designed, the pressure on the active material below the electrode plate group becomes insufficient, and there is a possibility that the charge / discharge performance may be reduced due to the falling off of the active material.

  Therefore, in the lead storage battery of Patent Document 1, the bottom of the positive pole and the bottom of the negative pole press down the splash-proof body disposed on the top face of the electrode plate group, thereby lifting the spacer located below the splash-proof body. I try to suppress it.

JP-A-59-33752

  However, since the splash-preventing body is pressed only at two points of each pole, the splash-preventing body is likely to be deformed or tilted by the buoyancy of the spacer applied to the splash-proof body. Then, the spacers are not sufficiently pressed by the splash-proof body.

  Therefore, the present invention has been made to solve the above problems, and has as its main objects to suppress the lifting of the spacer and to prevent deformation or inclination of the member for suppressing the lifting of the spacer from occurring. 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 with a separator interposed therebetween, a positive electrode 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 accommodating the electrode plate group and the straps, a spacer housed in the battery case and pressing the electrode plate group in a stacking direction, and contacting the at least one strap. And a lifting suppression member for suppressing the lifting of the spacer.

  With this lead storage battery, the lifting of the spacer can be suppressed by the lifting suppressing member. In particular, since the lifting restraining member is configured to contact the strap, the lifting restraining member can contact the lower surface of the belt-shaped strap, for example, from one end to the other end in the stacking direction, and the contact area between the lifting restraining member and the strap Can be increased. Since the contact area can be increased in this manner, the lifting suppression member is less likely to be deformed or tilted even when receiving the buoyancy of the spacer.

In some lead-acid batteries, at least one of the straps has an extension that extends in the width direction orthogonal to the laminating direction beyond the lug of the electrode plate connected to the strap.
By arranging at least a part of the lifting restraining member below the extending portion, the existing strap configuration can be effectively used, and the lifting of the spacer can be restrained without changing the shape of the strap. In addition, since the lifting restraining member is arranged below the extending portion extending in the width direction from the ear portion, the lifting suppressing member can be easily arranged below the strap without the ear portion obstructing. it can.

The extension is generally formed from one end to the other end of the at least one strap in the stacking direction. Also, in order to make it difficult for the lifting restraint member to be caught on the upper surface of the electrode plate group during assembly and to make it easy to mount below the extension portion and to prevent the electrode plate group from being damaged, the lifting restraint member is required to be extended portion. It is conceivable to adopt a configuration in which it is arranged with a backlash below.
In this configuration, the spacer is provided between the outermost surface of the electrode group in the stacking direction and the inner surface of the battery case, and the lift suppressing member is disposed below the extending portion and is disposed above the spacer. In the case of (1), the lift suppressing member is inclined when receiving the buoyancy of the spacer, and the upper surface thereof comes into contact with the lower surface of the extending portion. At this time, if the inclination angle of the lifting suppression member is large, there is a possibility that the lifting of the spacer cannot be sufficiently suppressed.
In order to preferably solve this problem, it is desirable that the lifting suppressing member is disposed from below one end to below the other end of the extending portion, and is disposed above the spacer.
With this configuration, the dimension of the lift suppressing member in the stacking direction can be increased, and the tilt angle when tilted by the buoyancy of the spacer can be reduced. Thereby, the lifting of the spacer can be reliably suppressed.

As described above, when the lifting restraint member is arranged with rattling below the strap, the lifting restraining member moves up and down due to the rattling. For this reason, when the lifting restraint member receives the buoyancy of the spacer, it moves upward, and the active material of the electrode plate group may be exposed from the lower end of the spacer in a state where the lifting of the spacer is suppressed.
In order to preferably solve this problem, the backlash of the lifting restraint member is reduced when the active material of the electrode plate group is removed from the spacer in a state where the lift restraining member contacts the lower surface of the strap and presses the spacer. It is desirable that the setting is made so as not to be exposed.
With this configuration, the floating of the spacer can be suppressed within a range in which the charge / discharge performance does not deteriorate due to the falling off of the active material.

If the lifting restraint member is arranged only below one of the straps, the lifting restraint member moves in the width direction orthogonal to the laminating direction due to external vibration or buoyancy of the spacer, and comes off from under the strap, The lifting of the spacer may not be suppressed.
In order to preferably solve this problem, the lifting restraint member includes a positive electrode side arrangement part arranged below the positive electrode strap, a negative electrode side arrangement part arranged below the negative electrode strap, and a positive electrode side arrangement part. It is desirable to have an arrangement part and a connecting part for connecting the negative electrode side arrangement part.
With this configuration, since the respective arrangement portions connected to each other are arranged below the respective straps, the lifting suppressing member is surrounded by the positive electrode strap, the ear portion of the positive electrode plate, the negative electrode strap, and the ear portion of the negative electrode plate. That is, even if it receives the vibration from the outside or the buoyancy of the spacer, it is difficult for the lifting restraint member to come off from below the strap, and it is possible to keep it below the strap.

In order to adjust the backlash of the lifting restraint member, it is conceivable to integrally form a convex portion protruding downward from the strap, but doing so increases the amount of lead used and increases the material cost. . In addition, the distance between the projection and the electrode plate is reduced at the initial stage, and the electrode plate is likely to be short-circuited when the electrode is elongated by use.
In order to preferably solve this problem and adjust the backlash of the lifting suppression member, it is preferable that the positive electrode side arrangement part and the negative electrode side arrangement part have a convex part projecting upward or downward. .
With this configuration, it is possible to adjust the backlash of the lifting suppression member below the strap by the height dimension of the convex portion, and to suppress the lifting as compared with a configuration in which the entire lifting suppression member is thickened to adjust the backlash. The material cost of the member can be reduced. Here, in the case of the configuration in which the protruding portion protrudes upward, portions other than the protruding portion in the lifting restraint member can be separated from the strap, and lead exfoliated substances generated from lead parts such as each strap or each pole are prevented from rising. Even if it is deposited on the upper surface of the member, a short circuit between the positive pole (or the positive strap) and the negative pole (or the negative strap) can be made hard to occur.

  Further, in order to adjust the backlash of the lifting suppressing 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 to have been. With this configuration, the mechanical strength of the lifting suppression member can be further increased. In addition, when the lifting suppressing member is made of a material such as resin that can be bent, the convex portion can be formed by bending, and the processing cost can be reduced.

As described above, the lifting restraint member is configured to have the positive electrode side placement part and the negative electrode side placement part connected to each other by the connection part, or by providing a projection on each placement part, the lifting suppression member is provided below the strap. The rattling of the member is reduced. However, in this configuration, the lead exfoliated matter generated from the lead component is less likely to fall from the upper surface of the lift suppression member, and the lead exfoliated material is easily deposited on the upper surface of the lift suppression member, and there is a fear that a short circuit due to the lead exfoliated matter is promoted. In particular, in the case of a configuration in which the convex portion protrudes upward, the convex portion hinders the fall of the lead exfoliated substance, and this problem may become significant.
In order to suitably prevent a short circuit due to the lead exfoliated matter, it is preferable that the connecting portion has a partition part projecting upward from an upper surface thereof to be partitioned between the positive electrode strap side and the negative electrode strap side.
According to this configuration, the lead separation material deposited on the upper surface of the lift suppressing member by the partitioning portion is less likely to be connected between the positive pole (or the positive electrode strap) and the negative pole (or the negative electrode strap). Can be prevented.

  In order to further prevent a short circuit due to the lead exfoliated matter, it is preferable that the partition part is formed from one end to the other end of the connecting part in the laminating direction. When the connecting portion of the lifting suppressing member is made of a material such as resin which can be bent, the partition portion can be formed by bending. With this configuration, the lifting restraining member is easily bent or bent with the partition as a starting point, and if the lifting restraining member is bent or curved when the lifting restraining member is inserted below the strap, the work of inserting the lifting restraining member can be facilitated. it can.

  When the battery case is formed of a material having translucency, the inside of the battery case becomes visible. In this case, the appearance of the battery may be impaired due to the lifting of the spacer and the falling off of the active material that may be caused by the lifting. In the present invention, since the lifting of the spacer is suppressed by the lifting suppressing member, the appearance of the battery can be hardly impaired.

  According to the present invention configured as described above, not only the lifting of the spacer is suppressed, but also the lifting suppressing member contacts the strap to suppress the floating of the spacer. Tilt can be made hard to occur.

It is a front sectional view showing typically composition of a lead storage battery of this embodiment. FIG. 3 is a side cross-sectional view schematically illustrating a configuration of the lead storage battery of the embodiment. FIG. 3 is a partial plan view of the same embodiment with the lid removed. It is the top view and front view of the lift suppression member of the embodiment. It is a schematic diagram which shows the relationship of the strap in the same embodiment, the lift suppression member, and the spacer. It is a schematic diagram which shows the relationship of the strap in the same embodiment, the lift suppression member, and the spacer. It is the top view and front view which show the modification of a lift suppression member. It is the top view and front view which show the modification of a lift suppression member. It is the top view and front view which show the modification of a lift suppression member. It is a top view which shows the modification of a lift suppression member. It is a schematic diagram which shows the modification of a lift suppression member.

  An embodiment of a lead storage battery according to the present invention will be described below 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 group 2 having a positive electrode plate 21 and a negative electrode plate 22, and a positive electrode plate 21 of the electrode group 2. And a negative electrode strap 4 to which the negative electrode plate 22 of the electrode group 2 is connected, and a battery case 6 for accommodating the electrode group 2 and each of the straps 3 and 4 together with the electrolytic solution 5. I have.

  The electrode plate group 2 is obtained by alternately stacking a plurality of positive electrode plates 21 and a plurality of negative electrode plates 22 so as to form a rectangular parallelepiped with a porous separator 23 interposed therebetween.

  The positive electrode plate 21 is formed by filling and holding a positive electrode active material in a grid-like frame (positive grid) made of, for example, a lead alloy. The positive electrode plate 21 has a current collecting ear 211 connected to the positive electrode strap 3 at one end of the upper edge. The negative electrode plate 22 is formed by filling and holding a negative electrode active material in a grid-like frame (negative electrode grid) 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 the width direction orthogonal to the laminating direction, the plurality of positive electrode plates 21 and the plurality of negative electrode plates 22 have ears 211 of the positive electrode plate 21 located on one side and ears 221 of the negative electrode plate 22 located on the other side. It is laminated so that it does. In the following, the laminating direction of the electrode plate group 2 is also referred to as the front-back direction, and the width direction orthogonal to the laminating direction is also referred to as the left-right direction.

  The positive electrode strap 3 integrates the ear portions 211 of the plurality of positive electrode plates 21 to collect current. As shown in FIGS. 1 and 3, the positive electrode strap 3 has a band shape in plan view, and extends from one end of the electrode group 2 in the stacking direction to the other end on one side in the width direction of the electrode group 2. And extend linearly.

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

  A positive pole 7 is connected to the upper part of the positive strap 3. In the present embodiment, the pole seat 32 protrudes inward in the width direction of the positive electrode strap 3 (specifically, the extension 31), and the upper surface of the extension 31 and the pole seat 32 are formed. The positive pole 7 is connected to the upper surface of the. It should be noted that a configuration in which the positive pole 7 is connected to the upper surface of the positive strap 3 without the pole seat 32 may be employed.

  The negative electrode strap 4 integrates the ear portions 221 of the plurality of negative electrode plates 22 to collect current. As shown in FIGS. 1 and 3, the negative electrode strap 4 has a band shape in plan view, and extends from one end in the stacking direction of the electrode group 2 to the other end on the other side in the width direction of the electrode group 2. And extend linearly.

  Further, the negative electrode strap 4 has an extending portion 41 extending 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 of the electrode plate group 2 in the stacking direction.

  A negative pole 8 is connected to the upper part of the negative strap 4. In the present embodiment, a pole seat portion 42 is formed 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 pillar seat portion 42 are formed. The negative pole 8 is connected to the upper surface. Note that a configuration in which the negative pole 8 is connected to the upper surface of the negative strap 4 without the pole seat portion 42 may be employed.

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

  As shown in FIGS. 1 and 2, the lead storage battery 100 of the present embodiment includes a spacer 10 that presses the electrode plate group 2 in the stacking direction, and a lifting suppression member 11 that suppresses the lifting of the spacer 10. ing.

  The spacer 10 is accommodated in the battery case 6, and specifically, is provided between the outer surface 2 a of the electrode group 2 in the stacking direction and the inner surface 6 a of the battery case 6. The spacer 10 of the present embodiment is a rectangular flat plate formed of styrene foam. Styrofoam has a lower specific gravity than the electrolytic solution and is easily lifted by buoyancy received from the electrolytic solution or by vibration during transportation or use, but the spacer 10 can be configured at a low cost.

  The spacer 10 covers the entire surface of the active material of the outermost electrode plate (negative electrode plate 22 in the present embodiment) located in the outermost direction in the stacking direction of the electrode plate group 2, and places the outermost electrode plate in the stacking direction inside. Is pressed. Although the spacers 10 are provided on both sides of the electrode group 2 in the stacking direction, the spacers 10 may be provided only on one side of the electrode group 2 in the stacking direction. Further, a configuration may be adopted in which the electrode group 2 is pressed in the stacking direction by disposing the spacer 10 inside the electrode group 2.

  The lifting restraint member 11 is separate from the straps 3, 4, and contacts the straps 3, 4 to restrain the spacer 10 from lifting. The lift suppressing member 11 is formed of a material having corrosion resistance to the electrolytic solution 5, and is formed of, for example, a resin such as polypropylene (PP).

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

  Here, between the electrode group 2 and each of the straps 3 and 4 is between the electrode group 2 and the extending portions 31 and 41 of the straps 3 and 4, and more specifically, the electrode group 2 And the lower surfaces of the extension portions 31 and 41 facing the upper surface of the electrode plate group 2. In the present embodiment, 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.

  As shown in FIG. 4, the lift suppressing member 11 of the present embodiment has a rectangular shape in a plan view, and one end (left end) 11 a in the width direction has an extending portion of the electrode plate group 2 and the negative electrode strap 4. 41, the other end (right end) 11b in the width direction becomes the positive electrode side disposed between the electrode plate group 2 and the extension 31 of the positive electrode strap 3. . Further, a portion between the negative electrode side arrangement part 11a and the positive electrode side arrangement part 11b becomes a connection part 11m for connecting them.

  With this configuration, a portion between the ear 211 of the positive electrode plate 21 and the ear 221 of the negative electrode plate 22 on the upper surface of the electrode plate group 2 is covered by the lift suppressing member 11. Thereby, the lift suppressing member 11 functions as a protective cover for protecting the electrode group 2 at the time of specific gravity measurement or at the time of water replenishment work.

  The lift suppression member 11 has a plurality of circular through holes 11h, for example. The through hole 11h facilitates the spread of the electrolytic solution 5 toward the electrode plate group 2 during water replenishment or the like. In addition, the lead exfoliated material separated from the straps 3, 4 and the like easily falls to the electrode plate group 2 side through the through hole 11h, so that the lead exfoliated material can be hardly deposited on the upper surface of the lifting suppression member 11.

  Further, in a state in which the lifting suppressing member 11 is disposed between the electrode group 2 and the extending portions 31 and 41 of the straps 3 and 4, both ends 11c and 11d in the laminating direction (front-back direction) are arranged in the electrode group. It extends to outside of 2. The extended portion serves as a spacer covering portion that covers all or a part of the spacer 10 vertically above.

  That is, the dimension in the front-rear direction of the lift suppressing member 11 is set to be larger than the dimension of the electrode plate group 2 in the stacking direction. The dimension in the front-rear direction of the lift suppressing member 11 is, of course, set to be smaller than the dimension in the front-rear direction of the internal space of the battery case 6. Here, the dimension of the lifting restraint member 11 in the front-rear direction is set so that, for example, in a state where the front end 11c is in contact with the inner side surface of the battery case 6, the rear end 11d covers above the spacer 10. .

  The lifting suppressing member 11 has a convex portion 111 at 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 extension portions 31 and 41 of the straps 3 and 4.

  The projection 111 is formed along the front-rear direction, and in the present embodiment, projects upward. Specifically, the convex portion 111 is formed continuously from at least one end of the straps 3 and 4 to the other end thereof in the front-rear direction. In the present embodiment, the convex portion 111 is formed continuously from one end to the other end of each of the arrangement portions 11a and 11b along the front-back direction.

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

  The partition part 112 is formed along the front-rear direction, and protrudes upward. The partitioning portion 112 is formed at the connecting portion 11m that connects the negative-side arrangement portion 11a and the positive-side arrangement portion 11b of the lifting suppression member 11, and is continuous from one end to the other end of the connection portion 11m in the front-rear direction. It is formed. The height of the partition portion 112 is such that short-circuiting does not occur due to the lead separation material, and is set, for example, based on the assumed amount of lead separation material deposition.

  In the lift suppressing member 11 thus configured, the convex portion 111 is formed by bending both ends of a flat plate made of resin such as polypropylene, and the partitioning portion 112 is formed by bending the central portion thereof. Is formed. That is, the lift suppressing member 11 of the present embodiment has a cross-sectional bent shape. As the bending process, for example, a press process can be considered.

In addition, each of the arrangement portions 11a and 11b of the lift suppression member 11 is arranged below the extension portions 31 and 41 of each of the straps 3 and 4 with play (see FIG. 5A). The rattling is caused by the arrangement of the electrode plates from the spacer 10 in a state where the arrangement portions 11a and 11b of the lifting suppression member 11 contact the lower surfaces of the straps 3 and 4 and press the spacer 10 (see FIG. 5B). The second active material is set so as not to be exposed. In addition, since the lifting suppression member 11 has a symmetrical shape on the negative electrode strap 4 side and the positive electrode strap 3 side, FIG. 5 shows a positional relationship on the negative electrode strap 4 side.
Due to the backlash, a vertical gap S1 is formed between each of the arrangement portions 11a and 11b 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 S <b> 1 is equal to the height of each of the arrangement portions 11 a and 11 b of the lifting suppression member 11 in front view, and This is the difference between the distance between the lower surfaces of the protrusions 31 and 41 and the upper surface of the electrode plate group 2.

  The gap S1 in the up-down direction is set such that the arrangement portions 11a and 11b of the lifting restraint member 11 contact the lower surfaces of the extending portions 31 and 41 of the straps 3 and 4 and press the spacer 10 while the spacer 10 is pressed. The active material of group 2 is set so as not to be exposed.

  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, the gap S1 of the present embodiment is larger than the amount of the spacer 10 protruding from the upper surface of the electrode plate group 2 (floating allowance L1). small. When the lower side of the spacer 10 is located at a position higher than the lower end of the active material of the electrode plate, a part of the active material is exposed below the spacer 10, and the pressure of the exposed portion is insufficient. There is a possibility that the charge / discharge performance may be reduced due to the falling off of the active material. Therefore, 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 lifting suppressing member 11 are in contact with the raised spacers 10 and the extending portions 31 and 41 of the straps 3 and 4. (Refer to FIG. 5B.) The amount L by which the spacer 10 protrudes from the upper surface of the electrode group 2 is smaller than the allowable lifting amount L1.

When the upper side of the spacer 10 is at a position higher than the upper surface of the electrode plate group 2 before the spacer 10 is lifted, the gaps S1 in the vertical direction are formed by the respective placement portions 11a and 11b of the lift suppression member 11. And the distance between the lower surface of the extension portions 31 and 41 and the upper surface of the spacer 10. In this case, the gap S1 in the vertical direction is also reduced from the spacer 10 in a state where the respective arrangement portions 11a and 11b of the lifting suppression member 11 contact the lower surfaces of the extending portions 31 and 41 of the straps 3 and 4 and press the spacer 10. The active material of the plate group 2 is set so as not to be exposed.
On the other hand, when the height of the spacer 10 is small, the lower side of the spacer 10 is located at a position higher than the lower end of the active material of the electrode plate when the upper side of the spacer 10 projects from the upper surface of the electrode plate group 2. There are cases. 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.

In addition, by having the gap S1 in the up-down direction, the lifting suppressing member 11 may be inclined between the extending portions 31, 41 of the straps 3, 4 and the electrode plate group 2. In addition, the lift suppression member 11 may move in the front-rear direction due to a gap formed between the lift suppression member 11 and the inner surface of the battery case in the front-rear direction. Therefore, as shown in FIG. 6, the inclination of the lift suppressing member 11 and the movement in the front-rear direction cause the horizontal direction generated between the inner surface 6 a of the battery case 6 and the front end 11 c or the rear end 11 d of the lift suppressor 11. It is necessary to set the vertical gap S1 and the dimension in the front-rear direction of the lift suppressing 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 electrode strap 4 side.
In addition, although each of the arrangement portions 11a and 11b of the lifting suppression member 11 has a play in the width direction between the ear portions 211 and 221 below the extension portions 31 and 41 of the straps 3 and 4, The rattling in the width direction is set such that the arrangement portions 11a and 11b of the lifting suppression member 11 do not move above the straps 3 and 4 because the arrangement portions 11a and 11b deviate from the extension portions 31 and 41 of the straps 3 and 4.

Next, the operation of the lift suppressing 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 comes into contact with the lower surface of the lift suppression member 11. In this embodiment, the spacer 10 contacts the lower surface of the negative electrode side arrangement part 11a and the lower surface of the positive electrode side arrangement part 11b of the lift suppression member 11. Then, as the spacer 10 rises, the lift suppressing member 11 is lifted, and the lower surface of the negative electrode side arrangement portion 11a and the upper surface of the positive electrode side arrangement portion 11b (the upper surface of the convex portion 111) are extended portions 31 of the straps 3, 4. , 41 (see FIG. 5B). As a result, further lifting of the spacer 10 is suppressed. Note that the gap between one end 11c of the lift suppression member 11 and the inner side surface 6a of the battery case 6 becomes large due to the inclination of the lift suppression member 11 and the like. Since it is less than (see FIG. 6), 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 suppressing member 11. In particular, since the lifting suppressing member 11 is configured to contact the straps 3 and 4, the lower surface of the band-shaped straps 3 and 4 can be contacted from one end to the other end in the stacking direction. , 4 can be increased in contact area. By increasing the contact area in this manner, the lifting suppression member 11 is less likely to be deformed or tilted even when receiving the buoyancy of the spacer 10.

  Further, in the case where the battery case 6 is made of a transparent resin and the inside is visible, the lifting of the spacer 10 is suppressed by the lifting suppressing member 11, so that the battery appearance can be hardly damaged.

  In addition, since the lifting suppressing member 11 is disposed below the extending portions 31 and 41 extending inward in the width direction from the ear portions 211 and 221, the existing strap configuration can be effectively used. The lifting of the spacer 10 can be suppressed without changing the shape. In addition, the lifting restraint member 11 can be easily arranged below the straps 3 and 4 without the ears 211 and 221 being in the way. Here, the lift suppressing member 11 is arranged from below one end to below the other end of the extending portions 31 and 41 and is arranged above the spacer 10, so that the inclination when tilted by the buoyancy of the spacer 10 is provided. The angle can be reduced, and the lifting of the spacer 10 can be reliably suppressed.

  Since the lift suppressing member 11 has the negative electrode side arrangement portion 11a and the positive electrode side arrangement portion 11b, the lift suppression member 11 is provided on 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. As a result, even when receiving vibration from the outside or buoyancy of the spacer 10, the lifting suppression member 11 is unlikely to come off from below the straps 3, 4, and is hard to come off from below the straps 3, 4. Can be kept down.

  Since the lifting restraint member 11 is configured to be loosely arranged below the straps 3 and 4, the lifting restraint 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 play of the lift suppressing 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 lift suppress member 11 contacts the lower surfaces of the straps 3 and 4 and presses the spacer 1. Therefore, the floating of the spacer can be suppressed within a range in which the charge / discharge performance does not deteriorate due to the falling off 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, it is possible to adjust the looseness of the floating suppressing member 11 below the straps 3, 4 by the height dimension of the convex part 111, thereby suppressing the floating. The material cost of the lifting suppression member 11 can be reduced as compared with a configuration in which the whole member 11 is thickened to adjust the play. Further, there is no need to integrally form a convex portion protruding downward from the strap, and it is possible to suppress an increase in the amount of lead used and an increase in material cost associated therewith. Further, since the protrusions 111 are formed over the entire laminating direction, the mechanical strength of the lift suppressing member 11 can be increased. At this time, the convex portion 111 is configured to protrude upward, so that portions other than the convex portion 111 can be separated from the straps 3 and 4, and a short circuit due to the deposited lead exfoliated material can be prevented. Further, since the lift suppressing member 11 is made of resin and the convex portion 111 can be formed by bending, the processing cost can be reduced.

  Since the connecting portion 11m between the positive electrode side disposition portion 11b and the negative electrode plate disposition portion 11a has the partition portion 112, it is possible to prevent a short circuit due to a lead exfoliated substance deposited on the upper surface of the lifting suppression member 11. Further, the mechanical strength of the lifting suppression member 11 can be increased. Here, since the partitioning portion 112 is formed from one end to the other end of the connecting portion 11m in the laminating direction, it is possible to more reliably prevent a short circuit due to a lead exfoliated substance deposited on the upper surface of the lifting suppression member 11. . Further, the lifting suppression member 11 is easily bent or bent with the partition portion 112 as a starting point. Work can also be facilitated.

  Note that the present invention is not limited to the above embodiment.

  Regarding the lifting suppression member 11, the shape 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, 4.

  For example, as shown in FIG. 7, the lift suppressing member 11 includes a rectangular flat plate portion 110, a left end portion 110 a serving as a negative electrode side placement portion and a right end portion 110 b serving as a positive electrode side placement portion of the flat plate portion 110. It may have a convex portion 111 protruding upward and a partition portion 112 protruding upward from a central portion in the left-right direction of the flat plate portion 110 (connecting portion connecting each disposed portion). In FIG. 7, the protrusion 111 and the partition 112 protrude vertically from the flat plate 110, but may protrude obliquely from the vertical. In addition, the protrusion 111 may protrude downward from both left and right ends 110 a and 110 b of the flat plate 110.

  The protruding portion 111 is not limited to being formed continuously from one end to the other end in the front-rear direction of the connecting portion 11m of the lifting suppression member 11, and as shown in FIG. It may be formed partially 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 lift suppressing 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 number of the partitions 112 is not limited to one, and a plurality of partitions 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 lift suppression member 11, and a plurality of convex portions of the wave shape are used as a plurality of partition portions 112. good.

  The lifting suppression member 11 has a rectangular shape in a plan view, and further includes, as shown in FIG. 10, a positive side placement section 11 a disposed below the positive side strap 3 and a negative side placement section disposed below the negative side strap. The shape is not limited to a rectangular shape in plan view as long as it has a connecting portion 11m for connecting the positive electrode side disposing portion 11a and the negative electrode side disposing portion 11b, and a spacer covering portion 11n for covering above the spacer 10. Although FIG. 10 shows a case where the connecting portion 11m and the spacer covering portion 11n are formed integrally, they may be formed separately.

  The lifting suppression member 11 is provided between the electrode group 2 and the positive electrode strap 3 and between the electrode group 2 and the negative electrode strap 4, and between the electrode group 2 and the positive electrode strap 3, and It may be provided between the electrode group 2 and the negative electrode strap 4 or at any one of them.

  Further, the lift suppressing member 11 is not limited to an integral structure, and may be formed of a plurality of parts. In this case, the lifting suppressing member 11 may be configured by assembling components forming the convex portion 111 and components forming the partitioning portion 112, for example.

  In addition, the lifting suppression member 11 may be configured to have no projection 111. In this case, for example, it is conceivable to increase the thickness of the lift suppression member 11.

  Furthermore, the lift suppressing member 11 may be configured to have no partition 112 (see FIG. 10). In this case, the lifting suppression member 11 may have a short-circuit prevention part other than the partition part 112. As the short-circuit preventing portion, for example, an opening 11 </ b> K configured so that the lead exfoliated material directly falls on the upper surface of the electrode plate group 2. Further, by increasing the opening shape of the through hole 11h formed in the lift suppressing member 11, a short circuit preventing portion may be provided.

In addition, in the above-described embodiment, the lift suppressing member 11 is provided between the straps 3 and 4 and the spacer 10 by providing the lift suppressing member 11 between the electrode plate group 2 and the straps 3 and 4. However, a configuration in which the lift suppressing member 11 is provided between the straps 3 and 4 and the spacer 10 without providing between the electrode plate group 2 and the straps 3 and 4 may be adopted.
For example, as shown in FIG. 11, the lifting restraint member 11 has one end in contact with the stacking direction ends 3a, 4a of the straps 3, 4, and the other end in contact with the upper end 10a of the spacer 10. Is also good. In FIG. 11, the lifting suppressing member 11 has a mounting portion 113 mounted on the lamination direction end 3a of the straps 3, 4 and at least the spacer 10 provided on the mounting portion 113 and disposed above the spacer 10. A configuration having a spacer cover portion 114 that partially covers the space is shown.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist thereof.

100 lead storage battery 2 electrode group 21 positive electrode plate 22 negative electrode plate 23 separator 3 positive electrode strap 31 extension 4 negative electrode strap 41 ··· Extension part 6 ··· Battery case 10 ··· Spacer 11 ··· Lifting suppressing member 11a ··· Negative electrode side arrangement part 11b ··· Positive electrode side arrangement part 11m ··· Connection part 111 ··· Convex part 112: Partition part

Claims (8)

An electrode group in which a plurality of positive plates and a plurality of negative plates are stacked via a separator,
A positive electrode strap to which the plurality of positive plates are connected;
A negative electrode strap to which the plurality of negative electrode plates are connected;
A battery case that houses the electrode group and each of the straps,
A spacer that is housed in the battery case and presses the electrode plate group in the stacking direction,
In contact with said at least one strap possess a suppressing member lifting suppressing floating of the spacer,
The at least one strap has an extended portion in a width direction perpendicular to the laminating direction than a lug of an electrode plate connected to the strap,
The extension is formed from one end to the other end of the at least one strap in the stacking direction,
The spacer is provided between an outermost surface of the electrode group in the stacking direction and an inner surface of the battery case,
The lead storage battery, wherein the lifting suppressing member is arranged so as to form a vertical gap in the stacking direction with the lower surface of the extending portion, and is arranged above the spacer. An electrode group in which a plurality of positive plates and a plurality of negative plates are stacked via a separator,
A positive electrode strap to which the plurality of positive plates are connected;
A negative electrode strap to which the plurality of negative electrode plates are connected;
A battery case that houses the electrode group and each of the straps,
A spacer that is housed in the battery case and presses the electrode plate group in the stacking direction,
A lifting suppression member that contacts the at least one strap to suppress the lifting of the spacer,
The at least one strap has an extended portion in a width direction orthogonal to the laminating direction than a lug of an electrode plate connected to the strap,
The lifting suppression member is arranged to form a vertical gap between the lower surface of the extending portion,
A lead-acid battery in which the gap in the vertical direction is set so that the active material of the electrode plate group is not exposed from the spacer in a state in which the lift suppressing member contacts the lower surface of the extension and presses the spacer. . The lifting suppression member,
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, 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 3, wherein the positive electrode side arrangement part and the negative electrode side arrangement part have a convex part projecting upward or downward.   The lead storage battery according to claim 4, wherein the protrusion is formed from one end to the other end of the positive electrode side arrangement part and the negative electrode side arrangement part in the stacking direction.   The lead-acid battery according to claim 3, wherein the connecting portion has an upwardly projecting partition that separates an upper surface between the positive electrode strap side and the negative electrode strap side.   The lead storage battery according to claim 6, wherein the partition portion is formed from one end to the other end of the connecting portion in the stacking direction.   The lead storage battery according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the battery case is formed of a material having a light transmitting property.