JP6999430B2 - Lead-acid battery - Google Patents

Description

The present invention relates to a lead storage battery.

Lead-acid batteries are widely used in industry and are used, for example, in automobile batteries, backup power sources, and main power sources for electric vehicles. In recent years, for the purpose of measures against carbon dioxide emission regulations, fuel efficiency, etc., an idling stop system vehicle (hereinafter referred to as "ISS vehicle") equipped with a system that stops the engine when controlling power generation, waiting for a signal, etc. has been actively studied. Lead-acid batteries are also required to have characteristics suitable for ISS vehicle applications.

Lead-acid batteries are required to improve their battery characteristics. It is known that it is effective to reduce the electric resistance in the electrode as one of the means for improving the battery characteristics. On the other hand, Patent Document 1 describes that the electric resistance of the negative electrode can be reduced by using scaly graphite as the negative electrode active material.

International Publication No. 2011/108056

As a result of investigating further means for reducing the electrical resistance of the electrodes, the present inventors can further reduce the electrical resistance of the electrodes by locating the ear portion of the electrode group closer to the center of the electrode group, thereby improving the battery performance. We have found that it can be improved. However, when a lead-acid battery with the ear part located closer to the center of the electrode group is mounted on the vehicle and used, the pole pillar, which is one of the constituent articles of the lead-acid battery, is damaged due to the vibration of the lead-acid battery accompanying the vibration of the vehicle. It became clear that is more likely to occur.

Therefore, an object of the present invention is to provide a lead storage battery capable of suppressing damage to pole columns while reducing the electrical resistance of the electrodes.

The present inventors focused on the distance between the selvage and the pole column of the electrode group. As a result, the selvage connected to the pole (the selvage on the pole side in the electrode group housed in the cell chamber where the pole is located) is positioned closer to the center of the electrode group, and the selvage is located from the pole. When the poles are separated from each other, the pole pillars are likely to be damaged. On the other hand, when the selvages are positioned closer to the poles and the distance between the selvages and the poles is shortened, the pole pillars are easily damaged. It was found that the damage of the main body is less likely to occur, and the present invention was completed.

One aspect of the present invention consists of a battery tank having N first to N cell chambers (N represents an integer of 3 or more) arranged in a predetermined direction, and a plurality of electrode plates laminated. , The first to Nth N electrode groups housed in the first to Nth cell chambers so that the stacking direction of the electrode plates is the above-mentioned predetermined direction, and the first electrode group located on the first electrode group. The present invention relates to a lead storage battery comprising one pole column and a second pole column located on the Nth electrode group. In this lead storage battery, the N electrode groups (first to Nth electrode groups) are projected from the pole pillar side and from the first pole pillar rather than the first selvage portion and the first ear portion, respectively. It has a second ear portion located far away, and when viewed from the stacking direction of the electrode plates, at least a part of the first ear portion in the second to second (N-1) electrode group is the first. The first ear part in the first electrode group is located closer to the center of the electrode group than the first ear part and the first pole column in the first electrode group, and the first ear part in the first electrode group is the second to the second (N-1). In the electrode group, it is located closer to the first pole column than the first ear portion located closer to the center of the electrode group.

In the lead-acid battery, the first ear portion in the second to (N-1) electrode groups is located closer to the center of the electrode group than the first ear portion and the first pole column in the first electrode group. Therefore, the distance between the ear on the electrode plate and the electrode active material filled at the position farthest from the ear is shortened, and the electrical resistance of the electrode can be reduced. Further, since the first selvage in the first electrode group is located closer to the first pole column than the first selvage in the second to second (N-1) electrode groups, the first ear is concerned. The distance between the selvage and the first pole is shortened, and the vibration of the electrode group due to the vibration of the lead storage battery can be suppressed. As a result, it is possible to reduce the stress applied to the first pole column when the lead-acid battery vibrates, and it is possible to suppress damage to the pole pillar. That is, according to the lead-acid battery, it is possible to suppress damage to the first pole while reducing the electrical resistance of the electrodes.

In the lead-acid battery, when viewed from the stacking direction of the electrode plates, all of the first ears in the second to second (N-1) electrode groups are the first ears and the first ears in the first electrode group. It may be located closer to the center of the electrode group than the first pole column. In this case, in all of the second to second (N-1) electrode groups, the first ear portion of the electrode group is more electrode than the first ear portion and the first pole column in the first electrode group. Compared to the case where the electrode plate is located near the end of the group, the distance between the ears on the electrode plate and the electrode active material filled at the position farthest from the ears is shortened, and the electrical resistance of the electrodes can be further reduced.

In the lead-acid battery, the first ear portion in the first electrode group may be located closer to the center of the electrode group than the first pole column when viewed from the stacking direction of the electrode plates. In this case, the first ear portion in the first electrode group is filled in the ear farthest from the ear and the ear in the electrode plate as compared with the case where the first ear portion is located closer to the end of the electrode group than the first pole column. The distance between the electrode active material and the electrode active material is shortened, and the electrical resistance of the electrode can be further reduced.

In the lead-acid battery, the first ear portion in the first electrode group may be located in the direction in which the first pole column extends when viewed from the stacking direction of the electrode plates. In this embodiment, the first ear portion and the first ear portion in the first electrode group are located closer to the center of the electrode group or closer to the edge of the electrode group than the first pole column. The distance between the poles and the poles is shortened, and the vibration of the electrode group due to the vibration of the lead storage battery can be further suppressed. Therefore, it is possible to further reduce the stress applied to the first pole column when the lead-acid battery vibrates, and it is possible to further suppress damage to the first pole pillar.

In the first electrode group, the electrode plate having the same polarity as the first pole column may be heavier than the electrode plate having a polarity different from that of the first pole column. In this case, the effect of the present invention becomes remarkable.

According to the present invention, it is possible to provide a lead storage battery capable of suppressing damage to pole columns while reducing the electrical resistance of the electrodes.

It is a perspective view which shows the whole structure and the internal structure of the lead storage battery of one Embodiment. FIG. 3 is an exploded perspective view of a main part of the lead storage battery shown in FIG. 1. It is a perspective view which shows the electrode group of the lead storage battery shown in FIG. It is a figure which looked at the inside of the lead storage battery shown in FIG. 1 from the stacking direction of an electrode plate. It is a figure which looked at the inside of the lead storage battery shown in FIG. 1 from the stacking direction of an electrode plate. It is a figure which looked at the inside of the lead storage battery of another embodiment from the stacking direction of an electrode plate.

FIG. 1 is a perspective view showing the overall configuration and internal structure of the lead storage battery of one embodiment. As shown in FIG. 1, the lead-acid battery 1 has an electric tank 2 having an open upper surface, a lid 3 for closing the opening of the electric tank 2, and an electrode group (electrode plate group) housed inside the electric tank 2. 4 and an electrolytic solution such as dilute sulfuric acid (not shown), and a pole column 5 extending from the lid 3 to the inside of the electric tank 2 are provided. The lid 3 is provided with a positive electrode terminal 6, a negative electrode terminal 7, and a liquid port plug 8 for closing the liquid injection port provided in the lid 3. The positive electrode terminal 6 and the negative electrode terminal 7 are electrically connected to the electrode group 4 via a pole column 5 (positive electrode column or negative electrode column) having the same polarity. The battery case 2 and the lid 3 are made of polypropylene, for example. The pole column 5 is made of, for example, lead or a lead alloy.

FIG. 2 is an exploded perspective view of a main part of the lead storage battery shown in FIG. As shown in FIG. 2, the electric tank 2 has, for example, a hollow rectangular parallelepiped shape. The bottom surface of the electric tank 2 is rectangular, and substantially the entire upper surface of the electric tank 2 is open. The electric tank 2 has six first to sixth cell chambers 22a to 22f arranged in a predetermined direction (hereinafter, these are collectively referred to as "cell chamber 22"). The cell chamber 22 is a space in which the electrode group 4 is inserted. In the lead-acid battery shown in FIG. 2, the electric tank 2 is provided with five partition walls 21 provided substantially parallel to the lateral direction of the electric tank 2 so that the longitudinal direction of the electric tank 2 is a predetermined direction (arrangement direction). The interior is divided into 6 sections. As a result, the first to sixth cell chambers 22a to 22f arranged along the longitudinal direction of the electric tank 2 are formed inside the electric tank 2.

The first to sixth cell chambers 22a to 22f accommodate the first to sixth electrode groups 4a to 4f, respectively. As shown in FIG. 2, each electrode group 4 has a first selvage portion 42 and a second selvage portion protruding from one end of the main body portion 41 and the main body portion 41 to the pole pillar 5 side (opening surface side of the battery tank 2). It has a portion 43. The second selvage portion 43 is located farther from the pole column 5 (for example, the positive electrode column 9) than the first selvagement portion 42. Details of the electrode group 4 will be described later.

As shown in FIG. 2, the positive electrode column 9, which is the first electrode column, extends from the lid 3 into the first cell chamber 22a and is located on the first electrode group 4a. Further, the negative electrode column 10, which is the second electrode column, extends from the lid 3 into the sixth cell chamber 22f and is located on the sixth electrode group 4f. In this embodiment, the positive electrode pillar 9 is the first pole pillar and the negative electrode pillar 10 is the second pole pillar, but the negative electrode pillar 10 is the first pole pillar and the positive electrode pillar 9 is the second pole. It may be a pillar.

Hereinafter, the configuration of the electrode group 4 (first to sixth electrode groups 4a to 4f) will be described with reference to FIGS. 3 to 5.

FIG. 3 is a perspective view showing a first electrode group 4a housed in the first cell chamber 22a. Unless otherwise specified, the second to sixth electrode groups 4b to 4f have the same configuration as the first electrode group 4a. As shown in FIG. 3, the first electrode group 4a includes a positive electrode plate 11, a negative electrode plate 12, and a separator 13. The first electrode group 4a has a structure in which a plurality of electrode plates (positive electrode plate 11 and negative electrode plate 12) are alternately laminated along the arrangement direction of the cell chamber 22 via the separator 13. That is, the electrode plate is arranged so that its main surface extends in a direction perpendicular to the arrangement direction of the cell chamber 22. In the example shown in FIG. 3, among the directions orthogonal to the stacking direction of the electrode plates, the direction substantially perpendicular to the opening surface of the electric tank 2 is the lateral direction of the electrode plate, and the direction substantially parallel to the opening surface of the electric tank 2. Is the longitudinal direction of the electrode plate.

The positive electrode plate 11 includes a positive electrode current collector 14 and a positive electrode active material 15 held (filled) in the positive electrode current collector 14. The negative electrode plate 12 includes a negative electrode current collector 16 and a negative electrode active material 17 held (filled) in the negative electrode current collector 16. The positive electrode active material 15 contains PbO ₂ as a Pb component, and further contains a Pb component other than PbO ₂ (for example, PbSO ₄ ) and an additive, if necessary. The negative electrode active material 17 contains a simple substance of Pb as a Pb component, and further contains a Pb component (for example, PbSO ₄ ) other than the simple substance of Pb and an additive, if necessary.

The current collectors (positive electrode current collector 14 and negative electrode current collector 16) include active material holding portions 18a and 18b for holding the electrode active material (positive electrode active material 15 or negative electrode active material 17), and active material holding units 18a, It has ears 19a and 19b protruding from one end of 18b. That is, the electrode plate provided with the current collector has an ear at one end thereof. The ears having the same polarity in the plurality of electrode plates are collectively welded by a strap (positive electrode strap 31 or negative electrode strap 32) to form a selvage portion (first ear portion 42 or second ear portion 43). In the present specification, a set of ears having the same polarity in the electrode group is referred to as a selvage. In the electrode group 4a, the first selvage portion 42 is the selvage portion of the positive electrode, and the second selvagement portion 43 is the selvage portion of the negative electrode. The current collector is made of, for example, a lead alloy. The current collector can be obtained by forming a lead alloy or the like in a grid pattern by a gravity casting method, an expanding method, a punching method, or the like.

The positive electrode strap 31 is provided with a pole column connecting portion 33 for connecting to the pole pillar 5. The negative electrode strap 32 is provided with an inter-cell connection portion 34 for connecting to the second electrode group 4b accommodated in the adjacent second cell chamber 22b. As shown in FIG. 2, in the second to fifth electrode groups 4b to 4e, the cell-to-cell connection portion 34 is provided on the positive electrode strap 31 and the negative electrode strap 32, and the pole column connection portion 33 is provided. do not have. Further, in the sixth electrode group 4f, the positive electrode strap 31 is provided with the cell-to-cell connection portion 34, and the negative electrode strap 32 is provided with the polar column connection portion 33. The straps (positive electrode strap 31 and negative electrode strap 32), the pole column connection portion 33, and the cell-to-cell connection portion 34 are made of, for example, a lead alloy.

The separator 13 has a bag shape and houses the negative electrode plate 12. The separator 13 is made of, for example, polyethylene (PE), polypropylene (PP), or the like. In another embodiment, the separator 13 may accommodate the positive electrode plate 11 and may not be bag-shaped.

FIG. 4 is a view of the inside of the lead storage battery 1 as viewed from the side of the first electrode group 4a in the stacking direction of the electrode plates. In FIG. 4, the electrode group located on the front side of the paper surface (first electrode group 4a) is shown by a solid line, and among the electrode groups located on the back side of the paper surface with respect to the electrode group located on the front side of the paper surface, the paper surface. The portion that does not overlap with the electrode group located on the front side (the first ear portion 42b in the second to fifth electrode groups 4b to 4e) is shown by a two-point chain line.

As shown in FIG. 4, when viewed from the stacking direction of the electrode plates, the first selvage portion 42b in the second to fifth electrode groups 4b to 4e is located closer to the center of the electrode group 4. That is, when viewed from the stacking direction of the electrode plates, the distance a from the first ear portion 42b in the second to fifth electrode groups 4b to 4e to the center of the electrode group 4 is the width of the electrode group 4 (ear). It is 1/4 or less of the length of the electrode group 4 in the direction substantially perpendicular to the protruding direction of the portion. Here, the distance from the ear portion viewed from the stacking direction of the electrode plates to the center of the electrode group is the width direction of the ear portion (direction substantially perpendicular to the protruding direction of the ear portion) when viewed from the stacking direction of the electrode plates. ) Is defined as the shortest distance from the center of the electrode group to the center in the width direction. The center of the selvage in the width direction is, for example, a point located at the center of the selvage in the width direction at the base of the selvage (one end of the main body of the electrode group on the side where the selvage protrudes) (for example, in FIG. 4). The indicated points A and B) may be used as a reference. The center of the electrode group in the width direction is referred to, for example, a point located at the center of the width direction of the electrode group at one end of the main body of the electrode group on the protruding side (for example, point C shown in FIG. 4). May be. Normally, when viewed from the stacking direction of the electrode plates, the distance from the ear of each electrode plate constituting the electrode group to the center of each electrode plate is the same, but from the ear of each electrode plate to the center of each electrode plate. When the distances are different from each other, the average of the distances from the ears to the center of each electrode plate in each electrode plate is taken as the distance from the ear portion viewed from the stacking direction of the electrode plates to the center of the electrode group.

In the example shown in FIG. 4, when viewed from the stacking direction of the electrode plates, all of the first selvage portions 42b in the second to fifth electrode groups 4b to 4e are located closer to the center of the electrode group 4. , Not limited to this. For example, a part of the first selvage portion 42b in the second to fifth electrode groups 4b to 4e may be located closer to the center of the electrode group 4 when viewed from the stacking direction of the electrode plates.

The first selvage portions 42b in the second to fifth electrode groups 4b to 4e are located so as to overlap each other when viewed from the stacking direction of the electrode plates. That is, the distances a in the second to fifth electrode groups 4b to 4e are all the same. In another embodiment, the distances a in the second to fifth electrode groups 4b to 4e may be different from each other. From the viewpoint of production efficiency, the distances a in the second to fifth electrode groups 4b to 4e are preferably equal. The distance a may be, for example, 24 mm or less or 15 mm or less from the viewpoint of further reducing the electrical resistance of the electrodes. The distance a may be, for example, 10 mm or more.

When viewed from the stacking direction of the electrode plates, the first selvage portion 42b in the second to fifth electrode groups 4b to 4e is larger than the first selvagement portion 42a and the positive electrode column 9 in the first electrode group 4a. , Located near the center of the electrode group 4. That is, when viewed from the stacking direction of the electrode plates, the first ear portion 42b in the second to fifth electrode groups 4b to 4e is the first ear portion in the second to fifth electrode groups 4b to 4e. The distance a from 42b to the center of the electrode group is from the distance b1 from the first ear portion 42a in the first electrode group 4a to the center of the electrode group and the distance c1 from the positive electrode column 9 to the center of the electrode group. Is also provided to be short. Here, the distance from the pole column viewed from the stacking direction of the electrode plates to the center of the electrode group is from the point located on the central axis of the pole column to the center of the electrode group when viewed from the stacking direction of the electrode plates. Is defined as the shortest distance of.

In the example shown in FIG. 4, all of the first selvage portions 42b in the second to fifth electrode groups 4b to 4e are more electrodes than the first selvagement portions 42a and the positive electrode column 9 in the first electrode group 4a. It is located near the center of group 4, but is not limited to this. For example, a part of the first selvage portion 42b in the second to fifth electrode groups 4b to 4e is in the center of the electrode group 4 rather than the first selvagement portion 42a and the positive electrode column 9 in the first electrode group 4a. It may be located closer.

The distance b1 from the first ear portion 42a in the first electrode group 4a to the center of the electrode group may be, for example, 50 mm or less or 30 mm or less from the viewpoint of further reducing the electrical resistance of the electrodes. The distance b1 may be, for example, 25 mm or more.

The distance c1 from the positive electrode column 9 to the center of the electrode group is, for example, 25 mm or more and 60 mm or less.

The ratio of the distance a to the distance b1 (a / b1) is, for example, less than 1 from the viewpoint that the effect of suppressing the damage of the positive electrode column (first pole column) while reducing the electrical resistance of the electrode can be easily obtained. It may be 0.8 or less. The ratio (a / b1) of the distance a to the distance b1 may be, for example, 0.2 or more. The difference (b1-a) between the distance a and the distance b1 is, for example, 5 mm from the viewpoint that the effect of suppressing the damage of the positive electrode column (first pole column) while reducing the electrical resistance of the electrode can be easily obtained. It may be more than or equal to 10 mm or more, and may be 30 mm or less or 15 mm or less.

The ratio of the distance a to the distance c1 (a / c1) is, for example, less than 1 from the viewpoint that the effect of suppressing the damage of the positive electrode column (first pole column) while reducing the electrical resistance of the electrode can be easily obtained. It may be 0.7 or less. The ratio of the distance a to the distance c1 (a / c1) may be, for example, 0.2 or more. The difference (c1-a) between the distance a and the distance c1 is, for example, 30 mm from the viewpoint that the effect of suppressing the damage of the positive electrode column (first pole column) while reducing the electrical resistance of the electrode can be easily obtained. It may be more than or equal to 35 mm or more, and may be 45 mm or less or 40 mm or less.

When viewed from the stacking direction of the electrode plates, the first selvage portion 42a in the first electrode group 4a is located near the center of the electrode group 4 in the second to fifth electrode groups 4b to 4e. It is located closer to the positive electrode column 9 than the selvage. That is, when viewed from the stacking direction of the electrode plates, the distance d1 from the first selvage portion 42a in the first electrode group 4a to the positive electrode column 9 is the electrode group in the second to fifth electrode groups 4b to 4e. It is shorter than the distance e1 from the first selvage portion located near the center of 4 to the positive electrode column 9. Here, the distance from the selvage to the pole pillar as viewed from the stacking direction of the electrode plates is located on the central axis of the pole pillar from the center in the width direction of the selvage when viewed from the stacking direction of the electrode plates. It means the shortest distance to the point.

In the example shown in FIG. 4, the first selvage portion 42a in the first electrode group 4a is the first selvagement portion in the second to fifth electrode groups 4b to 4e when viewed from the stacking direction of the electrode plates. It is located closer to the positive electrode column 9 than all the selvages of 42b, but is not limited to this. For example, the first selvage portion 42a in the first electrode group 4a is more than a part of the first selvage portion 42b in the second to fifth electrode groups 4b to 4e when viewed from the stacking direction of the electrode plates. May be located closer to the positive electrode column 9.

The distance d1 from the first ear portion 42a to the positive electrode column 9 in the first electrode group 4a is, for example, 15 mm or less or 10 mm or less from the viewpoint of suppressing damage to the positive electrode column (first polar column). good. The distance d1 may be, for example, 1 mm or more.

The distance e1 from the first selvage portion 42b to the positive electrode column 9 in the second to fifth electrode groups 4b to 4e is, for example, 10 mm or more and 30 mm or less.

The first selvage portion 42a in the first electrode group 4a is located closer to the center of the electrode group 4 than the positive electrode column 9 when viewed from the stacking direction of the electrode plates. That is, the distance b1 from the first ear portion 42a in the first electrode group 4a to the center of the electrode group is shorter than the distance c1 from the positive electrode column 9 to the center of the electrode group.

FIG. 5 is a view of the inside of the lead storage battery 1 as viewed from the side of the sixth electrode group 4f in the stacking direction of the electrode plates. In FIG. 5, the electrode group (sixth electrode group 4f) located on the front side of the paper surface is shown by a solid line, and among the electrode groups located on the back side of the paper surface than the electrode group 4 located on the front side of the paper surface, the paper surface. The portion that does not overlap with the electrode group located on the front side (the first ear portion 42b in the second to fifth electrode groups 4b to 4e) is shown by a two-point chain line.

The first selvage portion 42b in the second to fifth electrode groups 4b to 4e is larger than the first selvage portion 42c and the negative electrode column 10 in the sixth electrode group 4f when viewed from the stacking direction of the electrode plates. , Located near the center of the electrode group 4. That is, when the first ear portion 42b in the second to fifth electrode groups 4b to 4e is viewed from the stacking direction of the electrode plates, the distance a is the first ear portion in the sixth electrode group 4f. It is provided so as to be shorter than the distance b2 from 42c to the center of the electrode group and the distance c2 from the negative electrode column 10 to the center of the electrode group.

In the example shown in FIG. 5, all of the first selvage portions 42b in the second to fifth electrode groups 4b to 4e are more electrodes than the first selvagement portions 42c and the negative electrode column 10 in the sixth electrode group 4f. It is located near the center of group 4, but is not limited to this. For example, a part of the first selvage portion 42b in the second to fifth electrode groups 4b to 4e is located in the center of the electrode group 4 rather than the first selvagement portion 42c and the negative electrode column 10 in the sixth electrode group 4f. It may be located closer.

The first selvage portion 42c in the sixth electrode group 4f is located near the center of the electrode group 4 in the second to fifth electrode groups 4b to 4e when viewed from the stacking direction of the electrode plates. It is located closer to the negative electrode column 10 than the selvage. That is, when viewed from the stacking direction of the electrode plates, the distance d2 from the first selvage portion 42c in the sixth electrode group 4f to the negative electrode column 10 is the electrode group in the second to fifth electrode groups 4b to 4e. It is shorter than the distance e2 from the first selvage portion located near the center of 4 to the negative electrode column 10.

In the example shown in FIG. 5, the first selvage portion 42c in the sixth electrode group 4f is the first selvagement portion in the second to fifth electrode groups 4b to 4e when viewed from the stacking direction of the electrode plates. It is located closer to the negative electrode column 10 than all the selvages of 42b, but is not limited to this. For example, the first selvage portion 42c in the sixth electrode group 4f is more than a part of the first selvage portion 42b in the second to fifth electrode groups 4b to 4e when viewed from the stacking direction of the electrode plates. May be located closer to the negative electrode column 10.

The first selvage portion 42c in the sixth electrode group 4f is located closer to the center of the electrode group 4 than the negative electrode column 10 when viewed from the stacking direction of the electrode plates. That is, the distance b2 from the first selvage portion 42c in the sixth electrode group 4f to the center of the electrode group is shorter than the distance c2 from the negative electrode column 10 to the center of the electrode group.

The values that the distance b2, the distance c2, the distance d2, and the distance e2 can take may be the same as the above-mentioned distance b1, distance c1, distance d1, and distance e1, respectively. Further, the ratio of the distance a to the distance b2 (a / b2), the difference between the distance a and the distance b2 (b2-a), the ratio of the distance a to the distance c2 (a / c2), and the distance a and the distance c2. The possible values of the difference (c2-a) may be the same as the above-mentioned ratio (a / b1), difference (b1-a), ratio (a / c1) and difference (c1-a), respectively. ..

As shown in FIGS. 4 and 5, the second selvage portions 43 in the first to sixth electrode groups 4a to 4f are positioned so as to overlap each other when viewed from the stacking direction of the electrode plates. That is, the distances from the second selvage portion 43 in the first to sixth electrode groups 4a to 4f to the center of the electrode group are all the same. In another embodiment, the distances from the second selvage portion 43 in the first to sixth electrode groups 4a to 4f to the center of the electrode group may be different from each other. From the viewpoint of production efficiency, it is preferable that the above distances are equal.

The second selvage portion 43 in the first to sixth electrode groups 4a to 4f is located closer to the center of the electrode group 4 when viewed from the stacking direction of the electrode plates. That is, the distance from the second selvage portion 43 in the first to sixth electrode groups 4a to 4f to the center of the electrode group is 1/4 or less of the width of the electrode group 4. The position of the second selvage portion 43 in the first to sixth electrode groups 4a to 4f is not particularly limited, but from the viewpoint of further reducing the electrical resistance of the electrodes, the electrode group is viewed from the stacking direction of the electrode plates. It is preferably located near the center of 4.

In the lead-acid battery 1 described above, the first ear portion 42b in the second to fifth electrode groups 4b to 4e is located closer to the center of the electrode group 4 when viewed from the stacking direction of the electrode plates. Compared to the case where the ear portion of 1 is located near the end of the electrode group, the distance between the ear on the electrode plate and the electrode active material filled at the position farthest from the ear is shorter, and the electrical resistance of the electrode is reduced. Is reduced. In particular, in the lead-acid battery 1 of the above embodiment, since all of the first selvage portions 42b in the second to fifth electrode groups 4b to 4e are located near the center of the electrode group 4, the electrical resistance of the electrodes is reduced. The effect is noticeable.

Further, in the lead-acid battery 1 of the above embodiment, when viewed from the stacking direction of the electrode plates, the first ear portion 42b in the second to fifth electrode groups 4b to 4e is the first in the first electrode group 4a. Since it is located closer to the center of the electrode group 4 than the ear portion 42a and the positive electrode column 9, even if the first ear portion 42a in the first electrode group 4a is located closer to the positive electrode column 9, the electrical resistance of the electrode is Can be reduced. In particular, in the lead-acid battery 1 of the above embodiment, all of the first selvage portions 42b in the second to fifth electrode groups 4b to 4e are from the first selvagement portions 42a and the positive electrode column 9 in the first electrode group 4a. Since it is located near the center of the electrode group 4, the effect of reducing the electrical resistance of the electrodes is remarkably exhibited.

Further, in the lead-acid battery 1 of the above embodiment, when viewed from the stacking direction of the electrode plates, the first ear portion 42b in the second to fifth electrode groups 4b to 4e is the first in the sixth electrode group 4f. Since it is located closer to the center of the electrode group 4 than the ear portion 42c and the negative electrode column 10, even if the first ear portion 42c in the sixth electrode group 4f is located closer to the negative electrode column 10, the electrical resistance of the electrodes Can be reduced. In particular, in the lead-acid battery 1 of the above embodiment, all of the first selvage portions 42b in the second to fifth electrode groups 4b to 4e are from the first selvagement portions 42c and the negative electrode column 10 in the sixth electrode group 4f. Since it is located near the center of the electrode group 4, the effect of reducing the electrical resistance of the electrodes is remarkably exhibited.

Further, in the lead-acid battery 1 of the above embodiment, when viewed from the stacking direction of the electrode plates, the first ear portion 42a in the first electrode group 4a is the electrode group in the second to fifth electrode groups 4b to 4e. Since it is located closer to the positive electrode column 9 than the first ear portion located closer to the center of 4, the distance between the first ear portion 42a and the positive electrode column 9 becomes shorter, and the electrode due to the vibration of the lead storage battery becomes shorter. The vibration of group 4 can be suppressed. As a result, it is possible to reduce the stress applied to the positive electrode column 9 when the lead-acid battery vibrates (for example, the stress applied in the peripheral direction of the positive electrode column 9 and the stacking direction of the electrode plates). For this reason, in the lead-acid battery 1 of the above embodiment, the first ear portion 42b in the second to fifth electrode groups 4b to 4e is positioned closer to the center of the electrode group 4 to suppress the electrical resistance of the electrodes. While doing so, damage to the positive electrode column 9 (first polar column) can be suppressed. In particular, in the lead-acid battery 1 of the above embodiment, the first selvage portion 42a in the first electrode group 4a has a positive electrode column 9 more than all the first selvagement portions 42b in the second to fifth electrode groups 4b to 4e. Since it is located closer to the electrode, it is possible to more preferably achieve both reduction of the electrical resistance of the electrode and suppression of damage to the positive electrode column.

Further, in the lead-acid battery 1 of the above embodiment, when viewed from the stacking direction of the electrode plates, the first ear portion 42c in the sixth electrode group 4f is the electrode group in the second to fifth electrode groups 4b to 4e. Since it is located closer to the negative electrode column 10 than the first ear portion located closer to the center of 4, the distance between the first ear portion 42c and the negative electrode column 10 becomes shorter, and the electrode due to the vibration of the lead storage battery becomes shorter. The vibration of group 4 can be suppressed. As a result, it is possible to reduce the stress applied to the negative electrode column 10 when the lead-acid battery vibrates (for example, the stress applied in the peripheral direction of the negative electrode column 10 and the stacking direction of the electrode plates). For this reason, in the lead-acid battery 1 of the above aspect, the first ear portion 42b in the second to fifth electrode groups 4b to 4e is positioned closer to the center of the electrode group 4 to suppress the electrical resistance of the electrodes. At the same time, damage to the negative electrode column 10 (second pole column) can be suppressed. In particular, in the lead-acid battery 1 of the above embodiment, the first ear portion 42c in the sixth electrode group 4f has a negative electrode column 10 more than all the first ear portions 42b in the second to fifth electrode groups 4b to 4e. Since it is located closer to the electrode, it is possible to more preferably achieve both reduction of the electrical resistance of the electrode and suppression of damage to the negative electrode column.

Further, in the lead-acid battery 1 of the above embodiment, when viewed from the stacking direction of the electrode plates, the first ear portion 42a in the first electrode group 4a is located closer to the center of the electrode group 4 than the positive electrode column 9. Therefore, compared to the case where the first ear portion 42a is located closer to the end of the electrode group 4 than the positive electrode column 9, the ears on the electrode plate and the electrode active material filled at the position farthest from the ears The distance between them is shortened, and the electrical resistance of the electrodes can be further reduced. Further, in the lead storage battery 1 of the above embodiment, when viewed from the stacking direction of the electrode plates, the first ear portion 42c in the sixth electrode group 4f is located closer to the center of the electrode group 4 than the negative electrode column 10. Therefore, for the same reason as described above, the electrical resistance of the electrode can be further reduced.

Further, in the lead storage battery 1 of the above embodiment, when viewed from the stacking direction of the electrode plates, the second ear portions 43 of the first to sixth electrode groups 4a to 4f are located closer to the center of the electrode group 4. Therefore, the electrical resistance of the electrodes can be further reduced.

The lead-acid battery of the present invention may be another embodiment other than the above embodiment. FIG. 6 shows an example of the lead storage battery of another embodiment. FIG. 6 is a view of the inside of the lead storage battery of another embodiment as viewed from the side of the first electrode group 4a in the stacking direction of the electrode plates. In the above embodiment, the first selvage portion 42a in the first electrode group 4a is located closer to the center of the electrode group 4 than the positive electrode column 9 when viewed from the stacking direction of the electrode plates, which is shown in FIG. In the embodiment, the first ear portion 42a in the first electrode group 4a is located in the direction in which the positive electrode column 9 extends (on the central axis of the positive electrode column 9). Specifically, the distance d1 from the first selvage portion 42a to the positive electrode column 9 in the first electrode group 4a is 0. In this aspect, since the stress applied to the positive electrode column when the lead storage battery vibrates is further reduced, the damage to the positive electrode column can be further reduced. Similarly, even if the first selvage portion 42c in the sixth electrode group 4f is located in the direction in which the negative electrode column 10 extends (on the central axis of the negative electrode column 10) when viewed from the stacking direction of the electrode plates. good. In this case, since the stress applied to the electrode column and the negative electrode column during the vibration of the lead storage battery is further reduced, the damage to the negative electrode column can be further reduced.

Further, although not shown, the positive electrode column 9 may be located closer to the center of the electrode group 4 than the first selvage portion 42a in the first electrode group 4a when viewed from the stacking direction of the electrode plates. That is, the distance b1 from the first ear portion 42a in the first electrode group 4a to the center of the electrode group may be longer than the distance c1 from the positive electrode column 9 to the center of the electrode group. Similarly, when viewed from the stacking direction of the electrode plates, the negative electrode column 10 may be located closer to the center of the electrode group 4 than the first selvage portion 42c in the sixth electrode group 4f.

Further, in the above embodiment, the electrode group 4 (first electrode group 4a and sixth electrode group 4f) is connected to the pole pillar 5 (positive electrode pillar 9 and negative electrode pillar 10) via the pole pillar connecting portion 33. However, as shown in FIG. 6, the electrode group 4 and the pole pillar 5 may be connected to each other without passing through the pole pillar connecting portion 33. In the above embodiment, since the electrode group 4 is connected to the pole pillar 5 via the pole pillar connecting portion 33, the first ear portion 42 and the pole pillar are viewed from a direction perpendicular to the opening surface of the electric tank 2. 5 does not have an overlapping portion, but in the embodiment shown in FIG. 6, when viewed from a direction perpendicular to the opening surface of the battery case 2, the first selvage portion 42 and the pole pillar 5 overlap the overlapping portion. Will have. In this aspect, since the stress applied to the pole column during the vibration of the lead storage battery is further reduced, the damage to the pole pillar can be further reduced.

In the example shown in FIG. 2, the number N of the cell chambers 22 is 6, but the number of the cell chambers 22 is not limited to this, and is appropriately selected according to the use of the lead storage battery 1. The number N of the cell chamber 22 is usually an even number, but may be an odd number. Since the electrode groups are usually arranged in series, when the number N of the cell chambers is an odd number, the positive electrode group 9 and the negative electrode column 10 are located on different sides from each other with respect to the center in the width direction of the electrode group 4. Therefore, in the above embodiment, the first selvage 42 of the Nth electrode group (sixth electrode group 4f) is located closer to the negative electrode column (second pole column 10) than the second selvage 43. However, when the number N of the cell chambers is an odd number, the second selvage 43 of the Nth electrode group (sixth electrode group 4f) is a negative electrode column (second) than the first selvage 42. (Pole pillar) Located on the 10th side.

From the viewpoint that the same effect can be obtained for the same reason as when the number N of the cell chambers is an even number, when the number N of the cell chambers is an odd number, the second to second cells are viewed from the stacking direction of the electrode plates. At least a part (for example, all) of the second ear portion in the electrode group (N-1) is closer to the center of the electrode group than the second ear portion and the second pole column in the Nth electrode group. The second pole in the Nth electrode group is located closer to the center of the electrode group in the second to second (N-1) electrode groups than the second ear. It may be located closer. Further, when viewed from the stacking direction of the electrode plates, the second ear portion in the Nth electrode group may be located closer to the center of the electrode group than the second pole column. Further, when viewed from the stacking direction of the electrode plates, the second ear portion in the Nth electrode group may be located in the direction in which the second pole column extends.

In the example shown in FIG. 2, the first cell chamber and the Nth cell chamber (sixth cell chamber) are located at both ends of the cell chamber in the arrangement direction, but the arrangement order of the cell chambers is not particularly limited. In the present specification, the cell chamber in which the pole pillar 5 is located is the first cell chamber and the Nth cell chamber.

Further, when viewed from the stacking direction of the electrode plates, the first ear portion in the second to fifth electrode groups is more of the electrode group than the first ear portion and the first pole column in the first electrode group. Located closer to the center, the first ear in the first electrode group is located closer to the first pole column than the first ear located closer to the center of the electrode group in the second to fifth electrode groups. If so, the first ear portion in the second to fifth electrode groups must be located closer to the center of the electrode group than the first ear portion and the second pole column in the sixth electrode group. Often, the first ear in the sixth electrode group is not located closer to the second pole than the first ear located closer to the center of the electrode group in the second to fifth electrode groups. May be good. In this aspect, in the first electrode group, the effect of the present invention is remarkably exhibited when the electrode plate having the same polarity as the first pole pillar is heavier than the electrode plate having a polarity different from that of the first pole pillar. To. Usually, the positive electrode has a lower active material utilization rate than the negative electrode, and the positive electrode is designed to be heavier than the negative electrode. Therefore, the electrode column is more likely to be damaged due to the vibration of the vehicle. Therefore, it is preferable that the first pole column is the positive electrode column and the first selvage portion in the first electrode group is the positive electrode portion.

Next, the method for manufacturing the lead-acid battery 1 described above will be described. The method for manufacturing the lead-acid battery 1 is, for example, a lead-acid battery by assembling an electrode plate manufacturing process for obtaining a non-chemical electrode plate (a non-chemical positive electrode plate and a non-chemical negative electrode plate) and a component including the non-chemical electrode plate. The assembly process for obtaining 1 is provided.

In the electrode plate manufacturing process, for example, for each of the positive electrode plate 11 and the negative electrode plate 12, after the electrode active material paste (positive electrode active material paste and negative electrode active material paste) is filled in the active material holding portions 18a and 18b of the current collector. , Aging and drying to obtain an unchemical electrode plate.

For the positive electrode active material paste, for example, an additive (short fiber for reinforcement, etc.) and water are added to the raw material of the positive electrode active material (lead powder, lead tan (Pb ₃ O ₄ ), etc.), and then dilute sulfuric acid is added and kneaded. Obtained by doing. After this positive electrode active material paste is filled in the active material holding portion 18a of the positive electrode current collector 14, it is aged in an atmosphere of, for example, a temperature of 35 to 85 ° C. and a humidity of 50 to 98 RH% for 15 to 60 hours, and the temperature is 45 to 80 ° C. By drying for 15 to 30 hours, an unchemical positive electrode plate can be obtained.

For the negative electrode active material paste, for example, an additive (carbon material, barium sulfate, reinforcing short fiber, sulfonic acid group and / or resin having a sulfonic acid base, etc.) is added to the raw material (lead powder, etc.) of the negative electrode active material. It is obtained by adding dilute sulfuric acid and water and kneading after obtaining a mixture by dry mixing. After this negative electrode active material paste is filled in the active material holding portion 18b of the negative electrode current collector 16, it is aged in an atmosphere of, for example, a temperature of 45 to 65 ° C. and a humidity of 70 to 98 RH% for 15 to 30 hours, and the temperature is 45 to 60 ° C. By drying for 15 to 30 hours, an unchemical negative electrode plate can be obtained.

In the assembly process, for example, the unchemical positive electrode plate and the unchemical negative electrode plate are alternately laminated via the separator 13, and the ears of the positive electrode plate and the ears of the negative electrode plate are connected (welded, etc.) with straps, respectively. To obtain a group of electrodes. This group of electrodes is arranged in the battery case 2 to produce an unchemical battery. Next, after injecting an electrolytic solution (dilute sulfuric acid or the like) into a non-chemical battery, a direct current is applied to form an electric tank. The lead storage battery 1 can be obtained by adjusting the specific gravity of the electrolytic solution after chemical conversion to an appropriate specific density.

The chemical conversion conditions and the specific density of sulfuric acid can be adjusted according to the properties of the electrode active material. Instead of being carried out after the assembly step, the chemical conversion treatment may be carried out by immersing a large number of electrode plates after aging and drying in the electrode plate manufacturing step together in a chemical conversion tank (tank chemical conversion).

1 ... Lead storage battery, 2 ... Electric tank, 4 ... Electrode group, 4a-4f ... 1st to 6th electrode groups (1st to Nth electrode groups), 5 ... Polar column, 9 ... Positive electrode column (1st) (Pole column), 10 ... Negative electrode column (second pole column), 22a to 22f ... 1st to 6th cell chambers (1st to Nth cell chambers), 42 ... 1st ear, 42a ... First ear part in the first electrode group, 42b ... First ear part in the second to fifth electrode groups (first ear part in the second to (N-1) electrode group), 42c ... First ear in the sixth electrode group (first ear in the Nth electrode group), 43 ... Second ear.

Claims (5)

An electric tank having N first to N cell chambers (N represents an integer of 3 or more) arranged in a predetermined direction, and
A group of N first to Nth electrodes housed in the first to Nth cell chambers so that a plurality of electrode plates are laminated and the stacking direction of the electrode plates is the predetermined direction. ,
A first pole column located on the first electrode group and a second pole pillar located on the Nth electrode group are provided.
Each of the N electrode groups has a first selvage portion and a second selvage portion located farther from the first pole column than the first selvagement portion, which protrudes toward the pole pillar side. death,
When viewed from the stacking direction of the electrode plates
At least a part of the first selvage in the second to second (N-1) electrode group is more than the first selvage and the first pole in the first electrode group. Located near the center of the electrode group,
The first ear portion in the first electrode group is the first ear portion located closer to the center of the electrode group in the second to second (N-1) electrode groups. A lead-acid battery located near the pole of the. When viewed from the stacking direction of the electrode plates, all of the first ears in the second to second (N-1) electrode groups are the first ears and the first ears in the first electrode group. The lead-acid battery according to claim 1, which is located closer to the center of the electrode group than the first pole column. According to claim 1 or 2, the first ear portion of the first electrode group is located closer to the center of the electrode group than the first pole column when viewed from the stacking direction of the electrode plates. The lead-acid battery described. The lead-acid battery according to claim 1 or 2, wherein the selvage portion in the first electrode group is located in the direction in which the first pole column extends when viewed from the stacking direction of the electrode plates. The invention according to any one of claims 1 to 4, wherein in the first electrode group, an electrode plate having the same polarity as the first pole column is heavier than an electrode plate having a polarity different from that of the first pole column. Lead-acid battery.

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