WO2022123643A1

WO2022123643A1 - Lead acid stroage battery, strap, strap component, mold for strap production, and method for producing strap

Info

Publication number: WO2022123643A1
Application number: PCT/JP2020/045578
Authority: WO
Inventors: 祐一朗三代; 敏夫柴原; 佑輔原
Original assignee: 昭和電工マテリアルズ株式会社
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2022-06-16
Also published as: JPWO2022123643A1

Abstract

This lead acid storage battery is provided with: an electrolyte solution; and a strap that comprises a strap part to which a plurality of electrode plates are connected, an inter-cell connection part that is provided at an end of the strap part in an upright manner, and a conductive part that connects the strap part and the inter-cell connection part to each other. With respect to this lead acid storage battery, the liquid level of the electrolyte solution is below the strap. The strap comprises: a strap part for the connection of a plurality of electrode plates; an inter-cell connection part that is provided at an end of the strap part in an upright manner; and a conductive part that connects the strap part and the inter-cell connection part to each other.

Description

Lead-acid batteries, straps, strap parts, strap manufacturing molds, and strap manufacturing methods

The present invention relates to a lead storage battery, a strap, a strap component, a strap manufacturing mold, and a strap manufacturing method.

A lead-acid battery is known in which a group of plates and an electrolytic solution are housed in each of a plurality of cell chambers partitioned by a partition wall, and straps of the group of plates housed in adjacent cell chambers are connected through the partition wall. (For example, see Patent Document 1). Such lead-acid batteries are widely used as secondary batteries for industrial or consumer use, and in particular, lead-acid batteries for electric vehicles (so-called batteries), UPS (Uninterruptible Power Supply), disaster prevention (emergency) radio, etc. There is a great demand for lead-acid batteries for backup such as telephones.

JP-A-2019-109965

By the way, the straps of the adjacent cell chambers are connected by a through connection portion penetrating the partition wall. Then, when the output of the lead-acid battery is increased and the current flowing through the lead-acid battery is increased, the current is concentrated on the penetrating connection portion, and the heat generation of the penetrating connection portion is increased. In a lead-acid battery in which the penetrating connection portion is immersed in the electrolytic solution, such as a liquid lead-acid battery in which the electrolytic solution can freely flow in the cell chamber, the penetrating connection portion is cooled by the heat capacity of the electrolytic solution. Therefore, even if the output of the lead-acid battery is increased and the current flowing through the lead-acid battery is increased, the temperature of the penetrating connection portion does not rise to the extent that the partition wall is deformed and melted. However, a lead-acid battery in which the electrolytic solution cannot be freely fluidized in the cell chamber, such as a control valve type lead-acid battery in which the electrolytic solution is held in an electrolytic solution holder (retainer), or a liquid level of the electrolytic solution. In a lead-acid battery located below the strap, the penetration connection is not cooled by the electrolyte. Therefore, if the output of the lead-acid battery is increased and the current flowing through the lead-acid battery is increased, the temperature of the penetrating connection portion may rise to the extent that the partition wall is deformed and melted.

Therefore, one aspect of the present invention is to provide a lead storage battery, a strap, a strap component, a strap manufacturing mold, and a strap manufacturing method capable of suppressing the temperature rise of the through connection portion.

As a result of diligent research, the present inventors have found that the temperature rise of the through-connection portion can be suppressed by dispersing the current path in the through-connection portion.

The lead-acid battery according to one aspect of the present invention includes an electrolytic solution, a strap portion to which a plurality of electrode plates are connected, an inter-cell connection portion erected at the end of the strap portion, and a strap portion and an inter-cell connection portion. The strap comprises a conductive portion connecting with and a strap, and the liquid level of the electrolytic solution is lower than that of the strap.

Generally, the current tries to pass the shortest path. Therefore, when the conductive portion is not provided as in the conventional case, the current path through which the current passes in the penetrating connection portion penetrating the partition wall partitioning the cell chamber is concentrated in a small region on the strap portion side of the penetrating connection portion. Therefore, in the through connection portion, the current density is locally increased and the Joule heat generated is increased. As a result, the temperature of the penetrating connection portion may rise to the extent that the partition wall is deformed and melted. On the other hand, in this lead-acid battery, the strap has a conductive portion that connects the strap portion and the cell-to-cell connection portion. Therefore, a part of the current flowing between the plurality of electrode plates and the through connection portion passes through the conductive portion, so that the current path in the through connection portion is dispersed to the conductive portion side. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall from being deformed and melted. The fact that the liquid level of the electrolytic solution is lower than that of the strap means that the strap is not immersed in the electrolytic solution, and the electrolytic solution adheres to the strap due to the creeping up of the electrolytic solution due to surface tension, capillary action, or the like. It doesn't mean just that.

The strap has a positive electrode strap to which a plurality of positive electrodes are connected and a negative electrode strap to which a plurality of negative electrodes are connected. A through connection portion that penetrates and connects the positive electrode strap and the negative electrode strap accommodated in the adjacent cell chambers is further provided, and each of the positive electrode strap and the negative electrode strap connected by the through connection portion has a conductive portion. You may. Since each of the positive electrode strap and the negative electrode strap connected by the through connection portion has a conductive portion, the temperature rise of the through connection portion is further suppressed.

The upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion may be lower than the upper end position of the through connection portion in the vertical direction of the cell-to-cell connection portion with respect to the strap portion. In view of the nature of the current trying to pass the shortest path, it is difficult for the current to pass higher than the upper end position of the through connection. Therefore, since the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the upper end position of the through connection portion, the effect of suppressing the temperature rise of the through connection portion by the conductive portion is ensured, and the conductive portion of the conductive portion. Cost reduction can be achieved by downsizing.

In the vertical direction of the cell-to-cell connection portion with respect to the strap portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion may be higher than the lower end position of the through connection portion. Since the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is higher than the lower end position of the through connection portion, the current path in the through connection portion can be dispersed to the side of the through connection portion. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

The strap portion has a strap portion connection surface to which the conductive portion is connected facing the erecting direction side of the cell-to-cell connection portion with respect to the strap portion, and the cell-to-cell connection portion extends the strap portion to the cell-to-cell connection portion. It has a cell-to-cell connection part connection surface to which the conductive part is connected facing in the direction side, and the conductive part is a through connection in a direction orthogonal to the erection direction when viewed from the direction facing the cell-to-cell connection part connection surface. It may be arranged on the side of the part. Since the conductive portion is arranged on the side of the through connection portion, the current path in the through connection portion can be dispersed to the side of the through connection portion. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the strap portion with respect to the cell-to-cell connection portion, and is viewed from the direction in which the cell-to-cell connection portion connection surface faces. The penetrating connection portion may have an elliptical shape that is long in a direction orthogonal to the vertical direction of the cell-to-cell connection portion with respect to the strap portion. When viewed from the direction in which the cell-to-cell connection portion connection surface faces, the through connection portion has a long elliptical shape in the direction orthogonal to the erection direction, so that the current path in the through connection portion is orthogonal to the erection direction. Can be dispersed. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

The electric tank has a first cell chamber group in which a part of the plurality of cell chambers is arranged in the first direction, and a second cell chamber group in which the rest of the plurality of cell chambers are arranged in the first direction. , The first cell chamber group and the second cell chamber group are arranged side by side in the second direction orthogonal to the first direction, and in each of the first cell chamber group and the second cell chamber group, in the first direction. A through hole is formed in the partition wall that divides the adjacent cell chambers, and the positive and negative straps accommodated in each of the adjacent cell chambers in the first direction are connected by the through connection portion arranged in the through hole. The cell chambers arranged at one end of each of the first cell chamber group and the second cell chamber group in the first direction are defined as the first cell chamber and the second cell chamber, and the first cell chamber and the second cell chamber are defined as the first cell chamber and the second cell chamber. A pole column is attached to the positive or negative strap accommodated in each of the two cell chambers, and is arranged at the other end of the first cell chamber group and the second cell chamber group in the first direction. The cell chambers are the third cell chamber and the fourth cell chamber, and a through hole is formed in the partition wall separating the third cell chamber and the fourth cell chamber, and the positive electrode straps housed in the third cell chamber and the fourth cell chamber. And the negative electrode strap may be connected by a through connection portion arranged in the through hole. A pole pillar is attached to the positive electrode strap or the negative electrode strap housed in each of the first cell chamber and the second cell chamber, and the positive electrode strap and the negative electrode strap housed in the third cell chamber and the fourth cell chamber penetrate through each other. By being connected by the connecting portion, the positive electrode strap and the negative electrode strap accommodated in the third cell chamber and the fourth cell chamber and connected by the through connecting portion are likely to generate heat. However, as described above, the current path in the through connection portion is dispersed toward the conductive portion. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. Therefore, it is possible to prevent the partition wall that separates the third cell chamber and the fourth cell chamber from being deformed and melted.

The height of the conductive portion in the vertical direction of the inter-cell connection portion with respect to the strap portion may be lowered as the distance from the inter-cell connection portion is increased. In view of the nature of the current that tries to pass through the shortest path, the current path through which the current passes in the conductive portion tends to decrease as the distance from the cell-to-cell connection portion increases. For this reason, the height of the conductive portion in the vertical direction decreases as the distance from the cell-to-cell connection portion increases, so that the effect of suppressing the temperature rise of the through-connection portion by the conductive portion can be ensured, and the cost can be reduced by downsizing the conductive portion. Can be planned.

By the way, when manufacturing a lead-acid battery, the positive electrode strap housed in one of the adjacent cell chambers and the negative electrode strap housed in the other are through-welded to connect the positive electrode strap and the negative electrode strap. Form a connection. In penetration welding, the cell-to-cell connection portion is pressure-deformed toward the partition wall by the penetration-welding electrode, so that the cell-cell connection portion is pressure-deformed so that the cell-cell connection portion collapses with respect to the strap portion. Therefore, if the conductive portion is connected to the cell-to-cell connection portion, it becomes difficult to pressurize and deform the cell-to-cell connection portion. Moreover, the pressure deformation of the cell-to-cell connection portion by the through-weld electrode is performed so that the cell-cell connection portion falls down with respect to the strap portion. Therefore, as the connection position between the cell-to-cell connection portion and the conductive portion goes to the side opposite to the strap portion in the vertical direction, the pressure deformation of the cell-to-cell connection portion becomes more difficult.

Therefore, the conductive portion may have a recess that is locally lowered in the vertical direction of the inter-cell connection portion with respect to the strap portion. By having a recess in which the conductive portion is locally lowered in the vertical direction, it becomes easy to perform pressure deformation of the cell-to-cell connection portion so as to fall down with respect to the strap portion in through welding when manufacturing a lead storage battery.

The lead-acid battery may be a control valve type lead-acid battery. Since the lead-acid battery is a control valve type lead-acid battery, the through-connection portion is not cooled by the electrolytic solution, but as described above, the current path in the through-connection portion is dispersed on the conductive portion side. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed.

The strap according to one aspect of the present invention connects the strap portion for connecting a plurality of electrode plates, the cell-to-cell connection portion erected at the end of the strap portion, and the strap portion and the cell-to-cell connection portion. It is provided with a conductive portion.

This strap is equipped with a conductive part that connects the strap part and the cell-to-cell connection part. Therefore, in a lead-acid battery using this strap, a part of the current flowing between the plurality of electrode plates and the through connection portion passes through the conductive portion, so that the current path in the through connection portion is dispersed to the conductive portion side. .. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall of the lead storage battery using this strap from being deformed and melted.

The cell-to-cell connection portion has a planned connection area to be connected to the penetration connection portion arranged in the through hole formed in the partition wall of the lead storage battery, and the cell-to-cell connection portion is connected in the vertical direction of the cell-to-cell connection portion with respect to the strap portion. The upper end position of the connection portion between the portion and the conductive portion may be lower than the upper end position of the planned connection area. In a lead-acid battery using this strap, it is difficult for the current to pass through a position higher than the upper end position of the through connection portion in view of the nature of the current that tries to pass through the shortest path. Therefore, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the upper end position of the planned connection region. Therefore, in the lead storage battery using this strap, the temperature rise of the through connection portion is suppressed by the conductive portion. While ensuring the effect, it is possible to reduce the cost by downsizing the conductive part.

In the vertical direction of the cell-to-cell connection portion with respect to the strap portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion may be higher than the lower end position of the planned connection area. Since the upper end position of the connection part between the cell-to-cell connection part and the conductive part is higher than the lower end position of the planned connection area, in the lead storage battery using this strap, the current path in the through connection part is lateral to the through connection part. Can be dispersed in. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

In the vertical direction of the cell-to-cell connection portion with respect to the strap portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion may be lower than the center position of the cell-to-cell connection portion. In a lead-acid battery using this strap, the penetration connection portion is often connected to the central portion of the cell-to-cell connection portion. Then, in view of the nature of the current that tries to pass through the shortest path, it is difficult for the current to pass through a position higher than the upper end position of the through connection portion. Therefore, since the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the center position of the cell-to-cell connection portion, the effect of suppressing the temperature rise of the through connection portion by the conductive portion is ensured, and the conductive portion of the conductive portion. Cost reduction can be achieved by downsizing.

The strap portion has a strap portion connection surface to which the conductive portion is connected facing the erecting direction side of the cell-to-cell connection portion with respect to the strap portion, and the cell-to-cell connection portion extends the strap portion to the cell-to-cell connection portion. It has a cell-to-cell connection part connection surface to which the conductive part is connected facing the direction side, and the conductive part is scheduled to be connected in a direction orthogonal to the erection direction when viewed from the direction facing the cell-to-cell connection part connection surface. It may be arranged on the side of the area. Since the conductive portion is arranged on the side of the planned connection region, in the lead storage battery using this strap, the current path in the penetration connection portion can be dispersed to the side of the penetration connection portion. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

The height of the conductive portion in the vertical direction of the inter-cell connection portion with respect to the strap portion may be lowered as the distance from the inter-cell connection portion is increased. In a lead-acid battery using this strap, in view of the nature of the current that tries to pass through the shortest path, the current path through which the current passes in the conductive portion tends to decrease as the distance from the cell-to-cell connection portion increases. For this reason, the height of the conductive portion in the vertical direction decreases as the distance from the cell-to-cell connection portion increases, so that the effect of suppressing the temperature rise of the through-connection portion by the conductive portion can be ensured, and the cost can be reduced by downsizing the conductive portion. Can be planned.

The conductive portion may have a recess that is locally lowered in the vertical direction of the inter-cell connection portion with respect to the strap portion. By having a recess in which the conductive portion is locally lowered in the vertical direction, it becomes easy to perform pressure deformation of the cell-to-cell connection portion so as to fall down with respect to the strap portion in through welding when manufacturing a lead storage battery.

The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the strap portion with respect to the cell-to-cell connection portion, and is viewed from the direction in which the cell-to-cell connection portion connection surface faces. The planned connection area may have an elliptical shape that is long in a direction orthogonal to the vertical direction of the cell-to-cell connection portion with respect to the strap portion. The lead-acid battery using this strap has a current path in the through connection part because the planned connection area is long elliptical in the direction orthogonal to the vertical direction when viewed from the direction facing the connection surface between cells. , Can be dispersed in the direction orthogonal to the erection direction. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

The strap component according to one aspect of the present invention includes a base portion that is a part of a strap portion for connecting a plurality of electrode plates, a cell-to-cell connection portion erected at the end of the base portion, and a base-cell connection. A conductive portion for connecting the portions is provided.

This strap part is provided with a conductive part that connects the base part and the cell-to-cell connection part. Therefore, in a lead-acid battery using this strap component, a part of the current flowing between the plurality of electrode plates and the through connection portion passes through the conductive portion, so that the current path in the through connection portion is dispersed to the conductive portion side. do. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall of the lead storage battery using this strap component from being deformed and melted. Moreover, since the strap component is in a state where the conductive portion is connected to the base portion and the inter-cell connection portion, the strap can be easily manufactured by manufacturing the strap using the strap component.

The cell-to-cell connection portion has a planned connection area to be connected to the penetration connection portion arranged in the through hole formed in the partition wall of the lead storage battery, and the cell-to-cell connection portion is provided in the vertical direction of the cell-to-cell connection portion with respect to the base. The upper end position of the connection portion between the and the conductive portion may be lower than the upper end position of the planned connection region. In a lead-acid battery using this strap component, it is difficult for the current to pass through a position higher than the upper end position of the through connection portion in view of the nature of the current that tries to pass through the shortest path. Therefore, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the upper end position of the planned connection area. Therefore, in the lead storage battery using this strap component, the through connection portion by the conductive portion is used. It is possible to reduce the cost by downsizing the conductive portion while ensuring the effect of suppressing the temperature rise.

In the vertical direction of the cell-to-cell connection portion with respect to the base portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion may be higher than the lower end position of the planned connection region. The upper end position of the connection part between the cell-to-cell connection part and the conductive part is higher than the lower end position of the planned connection area. Therefore, in the lead storage battery using this strap component, the current path in the through connection part is connected through. It can be dispersed to the side of the part. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

In the vertical direction of the cell-to-cell connection with respect to the base, the upper end position of the connection between the cell-to-cell connection and the conductive part may be lower than the center position of the cell-to-cell connection. In a lead-acid battery using this strap component, the penetration connection portion is often connected to the central portion of the cell-to-cell connection portion. Then, in view of the nature of the current that tries to pass through the shortest path, it is difficult for the current to pass through a position higher than the upper end position of the through connection portion. Therefore, since the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the center position of the cell-to-cell connection portion, the effect of suppressing the temperature rise of the through connection portion by the conductive portion is ensured, and the conductive portion of the conductive portion. Cost reduction can be achieved by downsizing.

The base portion has a base connection surface to which the conductive portion is connected facing the erecting direction side of the cell-to-cell connection portion with respect to the base portion, and the cell-to-cell connection portion has a surface toward the extending direction side of the base portion with respect to the cell-to-cell connection portion. The conductive portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected, and the conductive portion is lateral to the planned connection region in a direction orthogonal to the erection direction when viewed from the direction in which the cell-to-cell connection portion connection surface faces. It may be arranged in. Since the conductive portion is arranged on the side of the planned connection region, in the lead storage battery using this strap component, the current path in the penetration connection portion can be dispersed to the side of the penetration connection portion. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

The height of the conductive portion in the vertical direction of the inter-cell connection portion with respect to the base portion may be lowered as the distance from the inter-cell connection portion is increased. In a lead-acid battery using this strap component, in view of the nature of the current that tries to pass through the shortest path, the current path through which the current passes in the conductive portion tends to decrease as the distance from the cell-to-cell connection portion increases. For this reason, the height of the conductive portion in the vertical direction decreases as the distance from the cell-to-cell connection portion increases, so that the effect of suppressing the temperature rise of the through-connection portion by the conductive portion can be ensured, and the cost can be reduced by downsizing the conductive portion. Can be planned.

The conductive portion may have a recess that is locally lowered in the vertical direction of the cell-to-cell connection portion with respect to the base portion. By having the concave portion where the conductive portion is locally lowered in the vertical direction, it becomes easy to perform pressure deformation of the cell-to-cell connection portion so as to fall down with respect to the base portion in through welding when manufacturing a lead storage battery.

The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the base portion with respect to the cell-to-cell connection portion, and is viewed from the direction in which the cell-to-cell connection portion connection surface faces. The planned connection area may have an elliptical shape that is long in a direction orthogonal to the vertical direction of the cell-to-cell connection portion with respect to the base portion. The lead-acid battery using this strap component has a current path in the through connection part because the planned connection area has a long elliptical shape in the direction orthogonal to the vertical direction when viewed from the direction in which the connection surface of the connection part between cells faces. Can be dispersed in a direction orthogonal to the erection direction. As a result, the current density of the through connection portion can be made lower, and the temperature rise of the through connection portion can be further suppressed.

The strap manufacturing mold according to one aspect of the present invention includes a cavity corresponding to at least a part of any of the above straps.

Since this strap manufacturing mold has a cavity corresponding to at least a part of the above strap, in the lead storage battery using the strap manufactured by this strap manufacturing mold, the current path in the through connection portion is on the conductive portion side. scatter. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall from being deformed and melted.

The cavity may correspond to the strap portion. In order for the cavity to correspond to the strap portion, for example, a current collector portion of each of a plurality of electrode plates and a strap component provided with a cell-to-cell connection portion and a conductive portion are arranged in the cavity to melt the lead material. By connecting these, it is possible to manufacture a strap in which the current collectors of the plurality of plates are connected. As a result, for example, a strap component provided with an inter-cell connection portion and a conductive portion can be manufactured in large quantities, and the cell-to-cell connection portion and the conductive portion can be shared between a plurality of cells or between a plurality of lead storage batteries. , Manufacturing cost can be reduced.

The strap manufacturing method according to one aspect of the present invention is erected on a strap portion for connecting a plurality of electrode plates and an adjacent strap arranged in a cell chamber next to a lead storage battery. A lead injection step of injecting molten lead into a strap cavity corresponding to a strap having a cell-to-cell connection part and a conductive part connected to the strap part and the cell-to-cell connection part, and a collection of each of a plurality of electrode plates. It is provided with a current collector arranging step of arranging the electric unit in the strap cavity.

In this strap manufacturing method, in the lead injection step, molten lead is injected into the strap cavity, and in the current collector arrangement step, the current collectors of the plurality of plates are arranged in the strap cavity to form a plurality of poles. Conductivity with the strap part to which each current collector of the board is connected and the cell-to-cell connection part erected in the strap part to be connected to the adjacent strap arranged in the cell chamber next to the lead storage battery. It is possible to manufacture a strap having a conductive portion connected to the strap portion and the cell-to-cell connection portion. Therefore, in the lead-acid battery using the manufactured strap, the current path in the through connection portion is dispersed on the conductive portion side. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall from being deformed and melted.

The strap cavity is open upward, and the current collector placement step may be performed after the lead injection step. Since the strap cavity is open upward, it is difficult to inject molten lead into the strap cavity if the current collector placement step is performed before the lead injection step, but the current collector placement step should be performed after the lead injection step. This makes it easier to inject molten lead into the strap cavity.

In the strap manufacturing method according to another aspect of the present invention, a current collector arrangement is provided in which the current collectors of the plurality of plates are arranged in the strap cavity corresponding to the straps for connecting the plurality of plates. The process, the base that becomes part of the strap, and the cell-to-cell connection that was erected at the base to connect to the through connection that was placed in the through hole formed in the partition wall of the lead storage battery, and the base. A base placement step of arranging a base portion of a strap component having a conductive portion connected to a cell-to-cell connection portion in a strap portion cavity, and a lead material for arranging a lead material to be a part of the strap portion in the strap portion cavity. It includes an arrangement step, a current collector arrangement step, a base arrangement step, and a melting step of melting the lead material after the lead material arrangement step.

In this strap manufacturing method, when the current collector arranging step, the base arranging step, the lead material arranging step, and the melting step are performed, the lead material arranged in the strap portion cavity is melted in the lead material arranging step. Then, due to the molten lead in which the lead material is melted, the current collectors of the plurality of electrode plates arranged in the strap cavity in the current collector arrangement process and the strap parts arranged in the strap cavity in the base arrangement process. The base of the strap is connected to the base of the strap, and a strap is formed. As a result, the cell-to-cell connection erected in the strap portion to be connected to the strap portion to which the current collectors of the plurality of plates are connected and the adjacent strap arranged in the cell chamber next to the lead storage battery. It is possible to manufacture a strap including a portion and a conductive portion which has conductivity and is connected to the strap portion and the cell-to-cell connection portion. Therefore, in the lead-acid battery using the manufactured strap, the current path in the through connection portion is dispersed on the conductive portion side. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall from being deformed and melted.

In the strap manufacturing method according to another aspect of the present invention, a current collector arrangement is provided in which the current collectors of the plurality of plates are arranged in the strap cavity corresponding to the strap portion for connecting the plurality of plates. The process, the base that becomes part of the strap, and the cell-to-cell connection that was erected at the base to connect to the through connection that was placed in the through hole formed in the partition wall of the lead storage battery, and the base. After the base placement step of arranging the base of the strap component having the conductive portion connected to the cell-to-cell connection portion in the strap portion cavity, the current collector placement step, and the base placement step, molten lead is formed in the strap portion cavity. It comprises a lead injection step of injecting.

In this strap manufacturing method, when the collector placement step, the base placement step, and the lead injection step are performed, the molten lead injected into the strap cavity in the lead injection step is placed in the strap cavity in the current collector placement step. Each of the current collecting portions of the plurality of electrode plates is connected to the base portion of the strap component arranged in the strap portion cavity in the base portion arranging step, and the strap portion is formed. As a result, the cell-to-cell connection erected in the strap portion to be connected to the strap portion to which the current collectors of the plurality of plates are connected and the adjacent strap arranged in the cell chamber next to the lead storage battery. It is possible to manufacture a strap including a portion and a conductive portion which has conductivity and is connected to the strap portion and the cell-to-cell connection portion. Therefore, in the lead-acid battery using the manufactured strap, the current path in the through connection portion is dispersed on the conductive portion side. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall from being deformed and melted.

According to one aspect of the present invention, it is possible to suppress the temperature rise of the penetrating connection portion.

FIG. 1 is a perspective view showing a lead storage battery according to an embodiment. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. FIG. 3 is a vertical cross-sectional view taken along the line III-III shown in FIG. FIG. 4 is a partially enlarged view of FIG. FIG. 5A is a perspective view showing an example of a comparative example strap for explaining the current density, and FIG. 5B is a front view showing an example of the comparative example strap for explaining the current density. It is a figure. FIG. 6 (a) is a perspective view showing an example of a strap of the embodiment for explaining the current density, and FIG. 6 (b) is a front view showing an example of the strap of the embodiment for explaining the current density. It is a figure. FIG. 7 shows an example of the relationship between the discharge time of the lead-acid battery and the temperature of the through connection portion of the lead-acid battery using the strap of the comparative example shown in FIG. 5 and the lead-acid battery using the strap of the embodiment shown in FIG. It is a graph which shows. 8 (a) and 8 (b) are vertical cross-sectional views showing other examples of the strap. 9 (a) and 9 (b) are vertical cross-sectional views showing other examples of the strap. Each of FIGS. 10 (a) and 10 (b) is a vertical cross-sectional view showing another example of the strap. 11 (a) and 11 (b) are vertical cross-sectional views showing other examples of straps. Each of FIGS. 12 (a) and 12 (b) is a vertical cross-sectional view showing another example of the strap. 13 (a) is a vertical cross-sectional view showing another example of the strap, and FIG. 13 (b) is a cross-sectional view of the strap shown in FIG. 13 (a). FIG. 14 is a side view for explaining an example of a method for manufacturing a strap. FIG. 15 is a side view for explaining an example of a method for manufacturing a strap. FIG. 15 is a side view for explaining an example of a method for manufacturing a strap. FIG. 17 is a perspective view for explaining an example of a method for manufacturing a strap. FIG. 18 is a perspective view for explaining another example of the method for manufacturing the strap. FIG. 19 is a side view for explaining another example of the method of manufacturing the strap. FIG. 20 is a side view for explaining another example of the method of manufacturing the strap. FIG. 21 is a side view for explaining another example of the method for manufacturing the strap. FIG. 22 is a perspective view for explaining another example of the method for manufacturing the strap. FIG. 23 is a vertical cross-sectional view showing another example of the strap. FIG. 24 is a vertical cross-sectional view showing another example of the strap. FIG. 25 is a vertical cross-sectional view showing another example of the strap.

Hereinafter, an embodiment of the lead storage battery according to one aspect of the present invention will be described in detail with reference to the drawings. In all the drawings, the same or corresponding parts are designated by the same reference numerals. Further, the vertical direction refers to the vertical direction in the lead storage battery. Further, "A or B" may include either A or B, and may include both.

<Lead-acid battery>
As shown in FIGS. 1 to 3, the lead storage battery 1 includes an electric tank 2 and a plurality of electrode plate groups 3. The lead storage battery 1 is, for example, a control valve type lead storage battery.

The battery case 2 is made of, for example, polypropylene (PP), ABS and polyphenylene ether (PPE). The upper surface portion (cover portion) of the electric tank 2 is provided with a positive electrode terminal 4, a negative electrode terminal 5, and a control valve 6 for discharging excess gas to the outside of the electric tank 2. Inside the battery case 2, a plurality of cell chambers 8 partitioned by a partition wall 7 are formed. In the present embodiment, as an example, the electric tank 2 will be described as being partitioned into six cell chambers 8 by a partition wall 7.

As shown in FIGS. 2 and 3, the electric tank 2 includes a first cell chamber group 20 in which three cell chambers 8 that are a part of the plurality of cell chambers 8 are arranged in the first direction D1, and a plurality of cells. The remaining three cell chambers 8 of the chamber 8 have a second cell chamber group 30 arranged in the first direction D1. The first cell chamber group 20 and the second cell chamber group 30 are arranged side by side in the second direction D2 orthogonal to the first direction D1. The first direction D1 and the second direction D2 are directions orthogonal to the third direction D3, which is the vertical direction of the lead storage battery 1. The second direction D2 is also the stacking direction of the plurality of positive electrodes 11 and the plurality of negative electrodes 12 in the electrode plate group 3.

The cell chamber 8 arranged at one side end (right end in FIG. 2) of the first cell chamber group 20 in the first direction D1 is referred to as a first cell chamber 21, and is referred to as a second cell chamber group 30. The cell chamber 8 arranged at one end in the first direction D1 is referred to as a second cell chamber 31. The cell chamber 8 arranged at the other side end portion (left end portion in FIG. 2) of the first cell chamber group 20 in the first direction D1 is referred to as a third cell chamber 22, and is referred to as a second cell chamber group 30. The cell chamber 8 arranged at the other end in the first direction D1 is referred to as a fourth cell chamber 32. The cell chamber 8 arranged between the first cell chamber 21 and the third cell chamber 22 of the first cell chamber group 20 is called the fifth cell chamber 23, and the second cell of the second cell chamber group 30 is called the fifth cell chamber 23. The cell chamber 8 arranged between the chamber 31 and the fourth cell chamber 32 is referred to as a sixth cell chamber 33.

The electrode plate group 3 and the electrolytic solution are housed in each of the plurality of cell chambers 8. The electrolytic solution contains, for example, sulfuric acid. The electrode plate group 3 includes a plurality of positive electrodes 11, a plurality of negative electrodes 12, a plurality of separators (not shown), a positive electrode strap 14, and a negative electrode strap 15. In each of the plurality of cell chambers 8, the liquid level of the electrolytic solution is lower than that of the positive electrode strap 14 and the negative electrode strap 15. That is, in a state where the lead-acid battery 1 is installed in a normal usage mode, the liquid level of the electrolytic solution is lower than that of the positive electrode strap 14 and the negative electrode strap 15. For example, the liquid level of the electrolytic solution is located below the strap because the electrolytic solution cannot be freely fluidized in each of the plurality of cell chambers 8. In this case, for example, the electrolytic solution may be held in the electrolytic solution holding body (retainer). Further, the electrolytic solution may be gelled by a gelling agent such as granular silica. Further, the electrolytic solution may be held in an electrolytic solution retainer (retainer) and gelled by a gelling agent such as granular silica. The fact that the liquid level of the electrolytic solution is lower than the positive electrode strap 14 and the negative electrode strap 15 means that the positive electrode strap 14 and the negative electrode strap 15 are not immersed in the electrolytic solution, and the electrolytic solution due to surface tension, capillary phenomenon, or the like. It does not mean that the electrolytic solution is merely adhered to the positive electrode strap 14 and the negative electrode strap 15 due to crawling up.

The positive electrode 11 is an electrode plate having a positive electrode current collector (not shown) and a positive electrode material held by the positive electrode current collector (not shown). The positive electrode current collector is a plate-shaped metal plate or an alloy plate, and has a lattice portion. The positive electrode material is, for example, a member filled in a lattice portion of a positive electrode current collector, and has a positive electrode active material and an additive.

The negative electrode 12 is an electrode plate having a negative electrode current collector (not shown) and a negative electrode material held by the negative electrode current collector (not shown). The negative electrode current collector is a plate-shaped metal plate or an alloy plate, and has a lattice portion. The negative electrode current collector is formed in the same manner as the positive electrode current collector. The negative electrode material is, for example, a member filled in a lattice portion of a negative electrode current collector, and has a negative electrode active material and an additive.

The separator is provided to prevent a short circuit between the positive electrode 11 and the negative electrode 12. The separator can be used, for example, as an electrolytic solution retainer (retainer) for holding the electrolytic solution. The separator includes, for example, glass fiber. The separator may contain, for example, an inorganic filler, an organic binder, or the like.

The positive electrode strap 14 is connected to each of the current collecting portions 16 of the plurality of positive electrodes 11 in order to collect current from the plurality of positive electrodes 11. That is, the current collectors 16 provided in each of the plurality of positive electrodes 11 are connected to each other via the positive electrode strap 14, so that the plurality of positive electrodes 11 are electrically connected to each other. The current collector 16 is also referred to as an ear portion.

The negative electrode strap 15 is connected to each of the current collecting portions 17 of the plurality of negative electrodes 12 in order to collect current from the plurality of negative electrodes 12. That is, the current collectors 17 provided in each of the plurality of negative electrodes 12 are connected to each other via the negative electrode strap 15, so that the plurality of negative electrodes 12 are electrically connected to each other. The current collector 17 is also referred to as an ear portion.

In the electrode plate group 3 housed in each of the plurality of cell chambers 8, the positive electrode strap 14 and the negative electrode strap 15 are arranged so as to face the first direction D1. In the first cell chamber group 20, the positive electrode strap 14 is arranged on one side (right side in FIG. 2) in the first direction D1, and the negative electrode strap 15 is arranged on the other side (left side in FIG. 2) in the first direction D1. Has been done. In the second cell chamber group 30, the positive electrode strap 14 is arranged on the other side (left side in FIG. 2) in the first direction D1, and the negative electrode strap 15 is arranged on one side (right side in FIG. 2) in the first direction D1. Has been done.

A positive electrode column 18 connected to the positive electrode terminal 4 is attached to the positive electrode strap 14 of the electrode plate group 3 housed in the first cell chamber 21, and the electrode plate group 3 housed in the second cell chamber 31 is attached. A negative electrode column 19 connected to the negative electrode terminal 5 is attached to the negative electrode strap 15. The positive electrode column 18 is erected on the positive electrode strap 14 and extends in a rod shape, and the negative electrode column 19 is erected on the negative electrode strap 15 and extends in a rod shape.

Then, the positive electrode strap 14 housed in one of the adjacent cell chambers 8 and the negative electrode strap 15 housed in the other are connected by a through connecting portion 40 arranged in the through hole 10 formed in the partition wall 7. ing. The through connection portion 40 is connected to the positive electrode strap 14 and the negative electrode strap 15 and conducts the positive electrode strap 14 and the negative electrode strap 15. Further, the through connection portion 40 maintains the airtightness of the adjacent cell chambers 8 through the through hole 10 by closing the through hole 10. The through-connection portion 40 is formed, for example, by through-welding the positive electrode strap 14 and the negative electrode strap 15 facing each other with the partition wall 7 interposed therebetween.

Specifically, in each of the first cell chamber group 20 and the second cell chamber group 30, a through hole 10 is formed in the partition wall 7 that partitions the cell chamber 8 adjacent to the first direction D1. The positive electrode strap 14 and the negative electrode strap 15 housed in each of the cell chambers 8 adjacent to each other in the direction D1 are connected by a through connecting portion 40 arranged in the through hole 10.

That is, in the first cell chamber group 20, a through hole 10 is formed in the partition wall 7 that separates the first cell chamber 21 and the fifth cell chamber 23, and the negative electrode strap 15 accommodated in the first cell chamber 21 The positive electrode strap 14 housed in the fifth cell chamber 23 is connected by a through connecting portion 40 arranged in the through hole 10 formed in the partition wall 7 that separates the first cell chamber 21 and the fifth cell chamber 23. ing. Similarly, a through hole 10 is formed in the partition wall 7 that separates the fifth cell chamber 23 and the third cell chamber 22, and is accommodated in the negative electrode strap 15 and the third cell chamber 22 accommodated in the fifth cell chamber 23. The positive electrode strap 14 is connected to the through connection portion 40 arranged in the through hole 10 formed in the partition wall 7 that separates the fifth cell chamber 23 and the third cell chamber 22.

In the second cell chamber group 30, a through hole 10 is formed in the partition wall 7 that separates the second cell chamber 31 and the sixth cell chamber 33, and the positive electrode strap 14 and the sixth cell chamber 31 housed in the second cell chamber 31 have a through hole 10. The negative electrode strap 15 housed in the cell chamber 33 is connected by a through connecting portion 40 arranged in the through hole 10 formed in the partition wall 7 that separates the second cell chamber 31 and the sixth cell chamber 33. .. Similarly, a through hole 10 is formed in the partition wall 7 that separates the sixth cell chamber 33 and the fourth cell chamber 32, and is accommodated in the positive electrode strap 14 and the fourth cell chamber 32 accommodated in the sixth cell chamber 33. The negative electrode strap 15 is connected to the through connection portion 40 arranged in the through hole 10 formed in the partition wall 7 that separates the sixth cell chamber 33 and the fourth cell chamber 32.

Further, a through hole 10 is formed in the partition wall 7 that divides the third cell chamber 22 and the fourth cell chamber 32, and the negative electrode strap 15 and the fourth cell chamber 32 housed in the third cell chamber 22 accommodate the through hole 10. The positive electrode strap 14 is connected to the positive electrode strap 14 by a through connecting portion 40 arranged in a through hole 10 formed in a partition wall 7 that partitions the third cell chamber 22 and the fourth cell chamber 32.

<Strap>
As shown in FIGS. 2 to 4, at least one of the positive electrode strap 14 and the negative electrode strap 15 connected by the through connection portion 40 has a conductive portion 53. In the present embodiment, as an example, both the positive electrode strap 14 and the negative electrode strap 15 connected by the through connection portion 40 will be described as having the conductive portion 53. The conductive portion 53 of the positive electrode strap 14 and the conductive portion 53 of the negative electrode strap 15 may be the same or different, but in the present embodiment, they will be described as being the same as an example. Further, the positive electrode strap 14 and the negative electrode strap 15 which are not connected by the through connection portion 40 may or may not have the conductive portion 53, but in the present embodiment, the conductive portion 53 is provided as an example. Explain as not. The positive electrode strap 14 and the negative electrode strap 15 not connected by the through connection portion 40 are the positive electrode strap 14 housed in the first cell chamber 21 and the negative electrode strap 15 housed in the second cell chamber 31.

Here, the positive electrode strap 14 and the negative electrode strap 15 connected by the through connection portion 40 have basically the same configuration, although there are some differences in size and the like. Therefore, unless otherwise specified, the positive electrode strap 14 and the negative electrode strap 15 connected by the through connection portion 40 will be collectively described as the strap 50.

The strap 50 has a strap portion 51, a cell-to-cell connection portion 52, and a conductive portion 53. The strap 50 is mainly made of lead and has conductivity. When lead is used as a main raw material, it means that it may be composed only of lead or that lead may contain various additives and the like.

The strap portion 51 extends in the second direction D2, and a plurality of positive electrodes 11 or a plurality of negative electrodes 12 are connected to the strap portion 51. The strap portion 51 is formed in a flat plate shape extending in the first direction D1 and the second direction D2, for example.

The cell-to-cell connection portion 52 is erected at the end of the strap portion 51 and is connected to the through connection portion 40. That is, the strap portion 51 extends in a direction away from the partition wall 7, and the cell-to-cell connection portion 52 is erected at the end portion of the strap portion 51 on the partition wall 7 side. The direction in which the cell-to-cell connection portion 52 is erected with respect to the strap portion 51 is referred to as an erection direction D4, and the direction in which the strap portion 51 extends with respect to the cell-to-cell connection portion 52, that is, the direction away from the partition wall 7. , The extension direction D5.

The erection direction D4 is the same as the third direction D3. Strictly speaking, the erection direction D4 may be different from the third direction D3 because the cell-to-cell connection portion 52 is pressure-deformed toward the partition wall 7 during through welding during the manufacture of the lead storage battery 1. However, since this pressure deformation is minute, in the present embodiment, the vertical direction D4 will be described as being the same as the third direction D3.

The extending direction D5 is a direction orthogonal to the standing direction D4. The negative electrode strap 15 housed in the first cell chamber 21, the positive electrode strap 14 and the negative electrode strap 15 housed in the fifth cell chamber 23, the positive electrode strap 14 housed in the third cell chamber 22, and the second cell chamber 31. The extending direction D5 of the positive electrode strap 14 housed in, the positive electrode strap 14 and the negative electrode strap housed in the sixth cell chamber 33, and the negative electrode strap 15 housed in the fourth cell chamber 32 is the first direction D1. Further, the extending direction D5 of the negative electrode strap 15 housed in the third cell chamber 22 and the positive electrode strap 14 housed in the fourth cell chamber 32 is the second direction D2.

The cell-to-cell connection portion 52 is formed in a flat plate shape and is in close contact with the partition wall 7. That is, the negative electrode strap 15 housed in the first cell chamber 21, the positive electrode strap 14 and the negative electrode strap 15 housed in the fifth cell room 23, the positive electrode strap 14 housed in the third cell room 22, and the second cell room 31. In each of the positive electrode strap 14 housed in, the positive electrode strap 14 and the negative electrode strap 15 housed in the sixth cell chamber 33, and the negative electrode strap 15 housed in the fourth cell chamber 32, the cell-to-cell connection portion 52 is the first. It is in close contact with the partition wall 7 that partitions the cell chamber 8 adjacent to the direction D1. Further, in the negative electrode strap 15 housed in the third cell chamber 22 and the positive electrode strap 14 housed in the fourth cell chamber 32, the cell-to-cell connection portion 52 is a partition wall that partitions the cell chamber 8 adjacent to the second direction D2. It is in close contact with 7.

The area of the cell-to-cell connection portion 52 connected to the through connection portion 40 when viewed from the extending direction D5 is referred to as a planned connection area 52A. The planned connection area 52A is an area connected to the through connection portion 40 in the lead storage battery 1, and is scheduled to be connected to the through connection portion 40 in the strap 50 before the through connection portion 40 is formed. It is an area.

The conductive portion 53 has conductivity in order to disperse the current density in the through connection portion 40, and connects the strap portion 51 and the cell-to-cell connection portion 52. Specifically, the strap portion 51 has a strap portion connecting surface 51B facing the erection direction D4 side to which the conductive portion 53 is connected. The cell-to-cell connection portion 52 has a cell-to-cell connection portion connection surface 52B to which the conductive portion 53 is connected facing the extending direction D5 side. That is, the conductive portion 53 is connected to the strap portion connection surface 51B of the strap portion 51 and the cell-to-cell connection portion connection surface 52B of the cell-to-cell connection portion 52. In this case, the conductive portion 53 may be arranged on the side of the through connection portion 40 in the direction orthogonal to the vertical direction D4 when viewed from the direction in which the cell-to-cell connection portion connection surface 52B faces. The direction in which the cell-to-cell connection portion connecting surface 52B faces is the extending direction D5.

The current density in the through connection portion 40 will be described with reference to FIGS. 5 and 6. 5 (a) and 5 (b) are diagrams showing an example of a strap of a comparative example, and FIGS. 6 (a) and 6 (b) are diagrams showing an example of a strap of an embodiment. The line C shown in FIGS. 5 and 6 is a line schematically showing the flow of electric current.

The strap 150 shown in FIG. 5 includes a strap portion 151 corresponding to the above-mentioned strap portion 51 and an inter-cell connection portion 152 corresponding to the above-mentioned inter-cell connection portion 52, and corresponds to the above-mentioned conductive portion 53. It does not have a part. In the lead-acid battery using the strap 150, the current path 140A through which the current passes in the through connection portion 140 is concentrated in a small area on the strap portion 151 side of the through connection portion 140. Therefore, in the through connection portion 140, the current density is locally increased, and the Joule heat generated is increased. As a result, the temperature of the penetrating connection portion 140 may rise to the extent that the partition wall is deformed and melted.

On the other hand, the strap 50 of the embodiment shown in FIG. 6 includes a strap portion 51, an inter-cell connection portion 52, and a conductive portion 53. Therefore, in the lead storage battery using the strap 50, a part of the current flowing between the plurality of positive electrodes or the plurality of negative electrodes and the through connection portion 40 passes through the conductive portion 53, so that the current path in the through connection portion 40 40A is dispersed on the conductive portion 53 side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed. As a result, it is possible to prevent the partition wall from being deformed and melted.

Here, a sample of a lead-acid battery using the strap 150 of the comparative example shown in FIG. 5 and a lead-acid battery using the strap 50 of the embodiment shown in FIG. 6 was prepared, and the discharge time of the lead-acid battery and the temperature of the through connection portion were measured. The relationship was measured. The measurement results are shown in FIG. In FIG. 7, line A is a measured value of a lead storage battery using the strap 150 of the comparative example shown in FIG. 5, and line B is a measured value of the lead storage battery using the strap 50 of the embodiment shown in FIG. be. As shown by line A in FIG. 7, in the lead storage battery using the strap 150 of the comparative example shown in FIG. 5, the temperature of the penetrating connection portion 140 was vigorously raised immediately after the start of discharge. Then, in about two and a half minutes, the reference temperature of 120 ° C. was exceeded. On the other hand, as shown by line B in FIG. 7, the lead-acid battery using the strap 50 of the embodiment shown in FIG. 6 penetrates more than the lead-acid battery using the strap 150 of the comparative example shown in FIG. 5 immediately after the start of discharge. The temperature rise of the connection portion 140 was significantly suppressed. And even after about 6 and a half minutes passed, the reference temperature of 120 ° C. was not exceeded. From this, it can be seen that the heat generation of the through connection portion 40 is suppressed by providing the conductive portion 53.

The number, position, shape, size, structure, etc. of the conductive portion 53 are not particularly limited as long as the current path 40A in the through connection portion 40 can be dispersed.

For example, as shown in FIGS. 8 (a), 8 (b), 9 (a), and 9 (b), conductivity seen from a direction orthogonal to the vertical direction D4 and the extending direction D5, respectively. The shape of the portion 53 may be a trapezoid (see FIG. 8 (a)), a rectangle (see FIG. 8 (b)), or a triangle (see FIG. 9 (a)). , It may be a quadrant (see FIG. 9B).

Further, as shown in FIGS. 10A and 10B, the shape of the conductive portion 53 seen from the direction orthogonal to the erection direction D4 and the extension direction D5 extends a plurality of trapezoids. The shape may be arranged in the direction D5 (see FIG. 10A), or may be a shape in which a plurality of rectangles having different heights are arranged in the extending direction D5 (see FIG. 10B).

Further, as shown in FIGS. 6A and 6B, the conductive portion 53 is orthogonal to the upright direction D4 when viewed from the direction in which the cell-to-cell connection portion connection surface 52B faces (extending direction D5). It may be arranged on one side of the through connection portion 40 or the planned connection area 52A in the direction of the connection. Further, as shown in FIGS. 13 (b) and 23, the conductive portion 53 is orthogonal to the upright direction D4 when viewed from the direction in which the cell-to-cell connection portion connection surface 52B faces (extending direction D5). It may be arranged on both sides of the through connection portion 40 or the planned connection area 52A in the direction.

Further, as shown in FIGS. 11 (a) and 11 (b), the conductive portion 53 is one of the cell-to-cell connection portions 52 when viewed from a direction orthogonal to the erection direction D4 and the extension direction D5. It may not be connected to the portion, and may not be connected to a part of the strap portion 51.

Here, in view of the nature of the current that tries to pass through the shortest path, it is difficult for the current to pass through a position higher than the upper end position P2 of the through connection portion 40. From this point of view, as shown in FIG. 11A, in the vertical direction D4, the upper end position P1 of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is the through connection portion 40 or the planned connection region. It may be lower than the upper end position P2 of 52A. The upper end position P2 of the penetration connection portion 40 and the upper end position P2 of the planned connection area 52A are at the same position. The connection portion 60 is a portion where the cell-to-cell connection portion 52 and the conductive portion 53 are connected.

Further, as shown in FIG. 11A, in the vertical direction D4, the upper end position P1 of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is the lower end position of the through connection portion 40 or the planned connection area 52A. It may be higher than P3.

Here, in the lead-acid battery 1, the penetration connection portion 40 is often connected to the central portion of the cell-to-cell connection portion 52. Further, as described above, in view of the nature of the current that tries to pass through the shortest path, it is difficult for the current to pass through a position higher than the upper end position P2 of the through connection portion 40. From this point of view, as shown in FIG. 11B, the upper end position P1 of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is the central position of the cell-to-cell connection portion 52 in the vertical direction D4. It may be lower than P4.

Further, as shown in each of FIGS. 9 (a), 9 (b), 11 (a), and 11 (b), the height of the conductive portion 53 is the cell-to-cell connection portion in the vertical direction D4. It may have a shape that becomes lower as the distance from 52 increases.

Further, as shown in FIGS. 10 (a), 12 (a), and 12 (b), the conductive portion 53 has a recess 62 (FIG. 10 (a)) that is locally lowered in the vertical direction D4. (See), recess 63 (see FIG. 12 (a)), and recess 64 (see FIG. 12 (b)). The recess 62, the recess 63, and the recess 64 are formed by cutting out a part of the conductive portion 53 on the side opposite to the strap portion 51 in the vertical direction D4. As shown in FIG. 12B, the lower end of the recess 64 may be curved rather than sharp.

By the way, when manufacturing the lead storage battery 1, the cell-to-cell connection portion 52 of the positive electrode strap 14 housed in one of the adjacent cell chambers 8 and the cell-to-cell connection portion 52 of the negative electrode strap 15 housed in the other are connected. Through welding is performed to form the through connection portion 40. Penetration welding is performed by pressing the penetration welding electrode against the through hole 10 of each cell-to-cell connection portion 52. Therefore, it is preferable that the conductive portion 53 is formed at a position where it does not interfere with the penetration welding electrode during through welding.

From this point of view, as shown in FIGS. 13 (a) and 13 (b), when the region where the through hole 10 is extended along the central axis D of the through hole 10 is defined as the through hole extension region E, it is conductive. The portion 53 may be arranged outside the through hole extension region E.

<Manufacturing method of strap>
Next, an example of a method for manufacturing the strap will be described with reference to FIGS. 14 to 17.

First, as shown in FIG. 14, a lead injection step is performed. In the lead injection step, a strap manufacturing mold 70 is prepared. The strap manufacturing mold 70 is a mold for manufacturing the strap 50. The strap manufacturing mold 70 is formed with a strap cavity 71 corresponding to the strap 50. The strap cavity 71 is open upward. The strap cavity 71 has a strap portion cavity 72 corresponding to the strap portion 51, an inter-cell connection portion cavity 73 corresponding to the cell-to-cell connection portion 52, and a conductive portion cavity 74 corresponding to the conductive portion 53. The strap portion cavity 72 is a space having the same shape as the outer shape of the strap portion 51. The cell-to-cell connection portion cavity 73 is a space having the same shape as the outer shape of the cell-to-cell connection portion 52. The conductive portion cavity 74 is a space having the same shape as the outer shape of the conductive portion 53.

Then, in the lead injection process, molten lead 75 is injected into the strap cavity 71 of the strap manufacturing mold 70. That is, the molten lead 75 is injected into the strap portion cavity 72, the cell-to-cell connection portion cavity 73, and the conductive portion cavity 74. The molten lead 75 is made from lead as a main raw material, and may be lead alone, or lead may contain various additives and the like.

Next, as shown in FIGS. 15 and 16, a current collector arranging step is performed. In the current collector arranging step, the current collectors 16 of the plurality of positive electrodes 11 or the current collectors 17 of the plurality of negative electrodes 12 are placed in the strap cavity 71 of the strap manufacturing mold 70 into which the molten lead 75 is injected. Place (insert). At this time, the current collector 16 or the current collector 17 is inserted into the strap cavity 72 of the strap cavity 71. In the present embodiment, after injecting molten lead 75 into the strap cavity 71, the current collector 17 is arranged in the strap cavity 71, but after the current collector 17 is arranged in the strap cavity 71, it is melted in the strap cavity 71. Lead 75 may be injected.

After that, when the molten lead 75 is cured, as shown in FIGS. 16 and 17, the plurality of positive electrodes 11 or the plurality of negative electrodes 12 are detached from the strap manufacturing mold 70. As a result, the strap 50 is manufactured. That is, each of the current collecting portions 16 of the plurality of positive electrodes 11 is connected to the positive electrode strap 14 (strap 50), and each of the current collecting portions 17 of the plurality of negative electrodes 12 is connected to the negative electrode strap 15 (strap 50). , The electrode group 3 is manufactured.

Next, another example of the method for manufacturing the strap will be described with reference to FIGS. 18 to 22.

First, as shown in FIG. 18, the strap part 50A is prepared. The strap component 50A is a component that forms a part of the strap 50. The strap component 50A has a base portion 51A, a cell-to-cell connection portion 52, and a conductive portion 53. Like the strap 50, the strap component 50A is made of lead as a main raw material and has conductivity.

The base portion 51A is a portion that becomes a part of the strap portion 51 for connecting a plurality of electrode plates. The base portion 51A is smaller than the strap portion 51, for example, and is formed in a flat plate shape extending in the first direction D1 and the second direction D2.

The cell-to-cell connection portion 52 is erected at the end of the base 51A in order to be connected to an adjacent strap arranged in the cell chamber 8 adjacent to the lead storage battery 1. That is, the cell-to-cell connection portion 52 is erected in the vertical direction D4 with respect to the base portion 51A, and the base portion 51A extends in the extension direction D5 with respect to the cell-to-cell connection portion 52. The cell-to-cell connection portion 52 of the strap component 50A is the same as the cell-to-cell connection portion 52 of the strap 50, but may be different from the cell-to-cell connection portion 52 of the strap 50 from the viewpoint of ease of manufacture and the like.

The conductive portion 53 connects the base portion 51A and the cell-to-cell connection portion 52. Specifically, the base portion 51A has a base connection surface 51AB to which the conductive portion 53 is connected facing the vertical direction D4 side of the cell-to-cell connection portion 52 with respect to the base portion 51A. The cell-to-cell connection portion 52 has an inter-cell connection portion connection surface 52B to which the conductive portion 53 is connected facing the extending direction D5 side of the base portion 51A with respect to the cell-to-cell connection portion 52. That is, the conductive portion 53 is connected to the base connection surface 51AB of the base 51A and the cell-to-cell connection portion connection surface 52B of the cell-to-cell connection portion 52. The conductive portion 53 of the strap component 50A is the same as the conductive portion 53 of the strap 50, but may be different from the conductive portion 53 of the strap 50 from the viewpoint of ease of manufacture and the like.

Next, as shown in FIGS. 19 and 20, a current collector placement step, a base placement step, and a lead material placement step are performed. In the present embodiment, the current collector arranging step, the base arranging step, and the lead material arranging step are performed in this order, but these steps may be performed in any order or at the same time.

In the current collector placement process, a strap manufacturing mold 80 is prepared. The strap manufacturing mold 80 is a mold for manufacturing the strap 50. The strap manufacturing mold 80 is formed with a strap cavity 81 corresponding to the strap 51. The strap manufacturing mold 80 includes a comb-shaped 82 for a positive electrode, a comb-shaped 83 for a negative electrode, and a coin 84.

The positive electrode comb-shaped 82 has a comb-shaped portion (not shown) formed in a comb shape for positioning each of the current collecting portions 16 of the plurality of positive electrodes 11, and a part of the strap portion cavity 81 corresponding to the positive electrode strap 14. And have. The comb-shaped 83 for the negative electrode is a comb portion (not shown) formed in a comb shape for positioning each of the current collecting portions 17 of the plurality of negative electrodes 12, and a part of the strap portion cavity 81 corresponding to the negative electrode strap 15. And have.

The winnings 84 has the rest of the strap cavity 81 corresponding to the positive electrode strap 14. Further, the bucket 84 has the remaining portion of the strap portion cavity 81 corresponding to the positive electrode strap 14. That is, the metal 84 is in contact with the comb-shaped 82 for the positive electrode to form the strap portion cavity 81 corresponding to the positive electrode strap 14, and is in contact with the comb-shaped 83 for the negative electrode to form the negative electrode. A strap cavity 81 corresponding to the strap 15 is formed. The money 84 may be divided into, for example, a portion that comes into contact with the positive electrode comb-shaped 82 and a portion that comes into contact with the negative electrode comb-shaped 83.

Then, in the current collector arranging process, the current collectors of the plurality of electrode plates are arranged in the strap cavity 81 of the strap manufacturing mold 80. That is, by inserting each of the current collecting portions 16 of the plurality of positive electrodes 11 into the comb portion of the comb-shaped 82 for the positive electrode, each of the current collecting portions 16 of the positive electrode 11 is positioned, and the winning metal 84 is comb-shaped for the positive electrode. It abuts on the mold 82. As a result, the strap portion cavity 81 corresponding to the positive electrode strap 14 is formed, and the current collecting portions 16 of the plurality of positive electrodes 11 are arranged in the strap portion cavity 81. Further, by inserting the current collecting portions 17 of the plurality of negative electrodes 12 into the comb portion of the comb-shaped 83 for the negative electrode, each of the current collecting portions 17 of the negative electrode 12 is positioned, and the winning metal 84 is comb-shaped for the negative electrode. It abuts on the mold 83. As a result, the strap portion cavity 81 corresponding to the negative electrode strap 15 is formed, and the current collecting portions 17 of the plurality of negative electrodes 12 are arranged in the strap portion cavity 81.

In the base placement process, the base 51A of the strap component 50A is placed in the strap cavity 81. Either of the current collector arranging step and the base arranging step may be performed first, or may be performed at the same time.

In the lead material placement process, the lead material 85, which is a part of the strap portion 51, is placed in the strap portion cavity 81. The lead material 85 is a solid material containing lead as a main raw material, and may be lead alone or may contain various additives and the like. Since the lead material 85 is melted in a subsequent step, at least a part of the lead material 85 may be placed in the strap cavity 81 in the lead material placement step. Further, the shape of the lead material 85 is not particularly limited, and can be, for example, a shape that can be easily inserted into the strap portion cavity 81.

Next, as shown in FIG. 20, a melting step is performed. In the melting step, at least a part of the lead material 85 is melted. The lead material 85 can be melted by, for example, a welding torch. By melting the lead material 85, the current collectors of the plurality of plates and the strap component 50A are connected to each other. Further, the gap of the strap portion cavity 81 is filled with the molten lead formed by melting the lead material 85.

After that, when the molten lead is hardened to form the strap portion 51, the strap manufacturing mold 80 is disassembled as shown in FIGS. 21 and 22. As a result, the strap 50 is manufactured. That is, each of the current collecting portions 16 of the plurality of positive electrodes 11 is connected to the positive electrode strap 14 (strap 50), and each of the current collecting portions 17 of the plurality of negative electrodes 12 is connected to the negative electrode strap 15 (strap 50). , The electrode group 3 is manufactured. The strap portion 51 is formed of a base 51A of the strap component 50A, a current collecting portion of each of the plurality of electrode plates, and a lead material 85 (a portion not melted and a portion cured after melting).

<Manufacturing method of lead-acid battery>
In the manufacture of the lead-acid battery 1, the electrode plate group 3 is inserted into each of the plurality of cell chambers 8 of the electric tank 2, and the cell-to-cell connection portion 52 of the positive electrode strap 14 housed in one of the adjacent cell chambers 8 is inserted. And the cell-to-cell connection portion 52 of the negative electrode strap 15 housed in the other side are through-welded. Through welding is performed by pressing a through welding electrode against a position facing the through hole 10 of the cell-to-cell connection portion 52 to energize. At this time, the cell-to-cell connection portion 52 is pressure-deformed toward the partition wall 7 by pressing the through-welding electrode, and the cell-to-cell connection portion 52 is brought into close contact with the partition wall. As a result, the through connection portion 40 connecting the positive electrode strap 14 and the negative electrode strap 15 is formed, the through hole 10 is closed by the through connection portion 40, and the cell-to-cell connection portion 52 is in close contact with the partition wall 7.

As described above, in the lead storage battery 1 according to the present embodiment, the strap 50 connected by the through connection portion 40 has a conductive portion 53 that connects the strap portion 51 and the cell-to-cell connection portion 52. Therefore, a part of the current flowing between the plurality of electrode plates and the through connection portion 40 passes through the conductive portion 53, so that the current path in the through connection portion 40 is dispersed on the conductive portion 53 side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed. As a result, it is possible to prevent the partition wall 7 from being deformed and melted.

Further, in the lead storage battery 1 according to the present embodiment, since each of the positive electrode strap 14 and the negative electrode strap 15 connected by the through connection portion 40 has the conductive portion 53, the temperature rise of the through connection portion 40 is further suppressed. ..

Further, in the lead storage battery 1 according to the present embodiment, the upper end position P1 of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is lower than the upper end position P2 of the through connection portion 40, so that the conductive portion 53 is used. It is possible to reduce the cost by downsizing the conductive portion 53 while ensuring the effect of suppressing the temperature rise of the through connection portion 40.

Further, in the lead storage battery 1 according to the present embodiment, the upper end position P1 of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is higher than the lower end position P3 of the through connection portion 40, so that the through connection portion 40 The current path in the above can be dispersed to the side of the through connection portion 40. As a result, the current density of the through connection portion 40 can be made lower, and the temperature rise of the through connection portion 40 can be further suppressed.

Further, in the lead storage battery 1 according to the present embodiment, since the conductive portion 53 is arranged on the side of the through connection portion 40, the current path in the through connection portion 40 is dispersed on the side of the through connection portion 40. Can be done. As a result, the current density of the through connection portion 40 can be made lower, and the temperature rise of the through connection portion 40 can be further suppressed.

Further, in the lead storage battery 1 according to the present embodiment, the positive electrode column 18 is attached to the positive electrode strap 14 housed in the first cell chamber 21, and the negative electrode column 19 is attached to the negative electrode strap 15 housed in the second cell chamber 31. Is attached, and the positive electrode strap 14 and the negative electrode strap 15 housed in the third cell chamber 22 and the fourth cell chamber 32 are connected by a through connection portion 40. Therefore, the positive electrode strap 14 and the negative electrode strap 15 housed in the third cell chamber 22 and the fourth cell chamber 32 and connected by the through connection portion 40 are likely to generate heat. However, as described above, the current path in the through connection portion 40 is dispersed on the conductive portion 53 side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed. Therefore, it is possible to prevent the partition wall 7 that separates the third cell chamber 22 and the fourth cell chamber 32 from being deformed and melted.

Further, in the lead storage battery 1 according to the present embodiment, the height of the conductive portion 53 in the vertical direction D4 decreases as the distance from the cell-to-cell connection portion 52 increases, so that the temperature rise of the through connection portion 40 is suppressed by the conductive portion 53. While ensuring the effect, it is possible to reduce the cost by downsizing the conductive portion 53.

By the way, when the lead-acid battery 1 is manufactured, the positive electrode strap 14 and the negative electrode strap are welded through the positive electrode strap 14 housed in one of the adjacent cell chambers 8 and the negative electrode strap 15 housed in the other. A through connection portion 40 for connecting to 15 is formed. In penetration welding, the cell-to-cell connection portion 52 is pressure-deformed to the partition wall 7 side by the penetration welding electrode, so that the cell-cell connection portion 52 is pressure-deformed so that the cell-to-cell connection portion 52 collapses with respect to the strap portion 51. Let me. Therefore, if the conductive portion 53 is connected to the cell-to-cell connection portion 52, it becomes difficult to pressurize and deform the cell-to-cell connection portion 52. Moreover, the pressure deformation of the cell-to-cell connection portion 52 by the through-weld electrode is performed so that the cell-to-cell connection portion 52 collapses with respect to the strap portion 51. Therefore, as the connection position between the cell-to-cell connection portion 52 and the conductive portion 53 goes to the side opposite to the strap portion 51 in the vertical direction D4, the pressure deformation of the cell-to-cell connection portion 52 becomes more difficult.

Therefore, in the lead-acid battery 1 according to the present embodiment, the conductive portion 53 has a recess 62, a recess 63, or a recess 64 that is locally lowered in the vertical direction D4, so that the lead-acid battery 1 is through-welded when the lead-acid battery 1 is manufactured. In the above, it becomes easy to pressurize and deform the cell-to-cell connection portion 52 so as to fall down with respect to the strap portion 51.

Further, since the lead storage battery 1 according to the present embodiment is a control valve type lead storage battery, the through connection portion 40 is not cooled by the electrolytic solution, but as described above, the current path in the through connection portion 40 is the conductive portion 53. Disperse to the side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed.

The strap 50 or the strap component 50A according to the present embodiment includes a conductive portion 53 that connects the strap portion 51 or the base portion 51A and the cell-to-cell connection portion 52. Therefore, in the lead storage battery using the strap 50 or the strap component 50A, a part of the current flowing between the plurality of electrode plates and the through connection portion 40 passes through the conductive portion 53, so that the current in the through connection portion 40 The path is dispersed on the conductive portion 53 side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed. As a result, it is possible to prevent the partition wall 7 of the lead storage battery 1 using the strap 50 or the strap component 50A from being deformed and melted. Moreover, since the strap component 50A is in a state in which the conductive portion 53 is connected to the base portion 51A and the cell-to-cell connection portion 52, the strap 50 can be easily manufactured by manufacturing the strap 50 using the strap component 50A. Can be manufactured.

Further, in the strap 50 or the strap component 50A according to the present embodiment, the upper end position of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is lower than the upper end position P2 of the planned connection area 52A. Therefore, in the lead storage battery 1 using the strap 50 or the strap component 50A, it is possible to reduce the cost by downsizing the conductive portion 53 while ensuring the effect of suppressing the temperature rise of the through connecting portion 40 by the conductive portion 53. ..

Further, in the strap 50 or the strap component 50A according to the present embodiment, the upper end position P1 of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is higher than the lower end position P3 of the planned connection area 52A. Therefore, in the lead storage battery 1 using the strap 50 or the strap component 50A, the current path in the through connection portion 40 can be dispersed to the side of the through connection portion 40. As a result, the current density of the through connection portion 40 can be made lower, and the temperature rise of the through connection portion 40 can be further suppressed.

Further, in the strap 50 or the strap component 50A according to the present embodiment, the upper end position P1 of the connection portion 60 between the cell-to-cell connection portion 52 and the conductive portion 53 is lower than the central position P4 of the cell-to-cell connection portion 52, so that it is conductive. It is possible to reduce the cost by downsizing the conductive portion 53 while ensuring the effect of suppressing the temperature rise of the through connecting portion 40 by the portion 53.

Further, in the strap 50 or the strap component 50A according to the present embodiment, the conductive portion 53 is arranged on the side of the planned connection area 52A, so that the lead storage battery 1 using the strap 50 or the strap component 50A penetrates. The current path in the connection portion 40 can be dispersed to the side of the through connection portion 40. As a result, the current density of the through connection portion 40 can be made lower, and the temperature rise of the through connection portion 40 can be further suppressed.

Further, in the strap 50 or the strap component 50A according to the present embodiment, the height of the conductive portion 53 in the vertical direction D4 decreases as the distance from the cell-to-cell connection portion 52 increases, so that the through connection portion 40 by the conductive portion 53 It is possible to reduce the cost by downsizing the conductive portion 53 while ensuring the effect of suppressing the temperature rise.

Further, in the strap 50 or the strap component 50A according to the present embodiment, when the lead storage battery 1 is manufactured, the conductive portion 53 has a recess 62, a recess 63, and a recess 64 that are locally lowered in the vertical direction D4. In the through welding of the cell-to-cell connection portion 52, it becomes easy to perform pressure deformation of the inter-cell connection portion 52 so as to fall down with respect to the strap portion 51 or the base portion 51A.

Since the strap manufacturing mold 70 or the strap manufacturing mold 80 according to the present embodiment includes the strap cavity 71 or the strap portion cavity 81 corresponding to at least a part of the strap 50, the strap manufacturing mold 70 or the strap manufacturing mold 70 or the strap manufacturing mold 80 is provided. In the lead-acid battery 1 using the strap 50 manufactured by the mold 80, the current path in the through connection portion 40 is dispersed on the conductive portion 53 side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed. As a result, it is possible to prevent the partition wall 7 from being deformed and melted.

Further, in the strap manufacturing mold 80 according to the present embodiment, since the cavity corresponds to the strap portion 51, for example, each of the current collecting portions of the plurality of electrode plates, the cell-to-cell connection portion 52, and the conductive portion 53 are provided. The strap 50 can be manufactured by arranging the strap component 50A and the strap component 50A in the cavity and connecting them by melting the lead material or the like. Thereby, for example, the strap component 50A provided with the cell-to-cell connection portion 52 and the conductive portion 53 can be mass-produced, and the cell-to-cell connection portion 52 and the conductivity can be manufactured between a plurality of cell chambers 8 or between a plurality of lead storage batteries 1. By sharing the parts 53, the manufacturing cost can be reduced.

In the strap manufacturing method according to the present embodiment, the molten lead 75 is injected into the strap cavity 71 in the lead injection step, and the current collectors of the plurality of plates are arranged in the strap cavity 71 in the current collector arrangement step. By doing so, the strap portion 51 to which the current collecting portions of the plurality of electrode plates are connected and the adjacent strap arranged in the cell chamber 8 next to the lead storage battery 1 are connected to each other, so that the strap portion 51 is erected. It is possible to manufacture the strap 50 including the cell-to-cell connection portion 52 and the conductive portion 53 which has conductivity and is connected to the strap portion 51 and the cell-to-cell connection portion 52. Therefore, in the lead-acid battery 1 using the manufactured strap 50, the current path in the through connection portion 40 is dispersed on the conductive portion 53 side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed. As a result, it is possible to prevent the partition wall 7 from being deformed and melted.

Further, in the strap manufacturing method according to the present embodiment, since the strap cavity 71 is opened upward, it is difficult to inject molten lead 75 into the strap cavity 71 if the current collector arrangement step is performed before the lead injection step. However, by performing the current collector arranging step after the lead injection step, it becomes easy to inject the molten lead 75 into the strap cavity 71.

In another strap manufacturing method according to the present embodiment, when the current collector arranging step, the base arranging step, the lead material arranging step, and the melting step are performed, the lead material 85 arranged in the strap portion cavity 81 in the lead material arranging step is performed. Is melted. Then, the molten lead in which the lead material 85 is melted is arranged in each of the current collecting portions of the plurality of electrode plates arranged in the strap portion cavity 81 in the current collecting portion arranging step and in the strap portion cavity 81 in the base arranging step. The base portion 51A of the strap component 50A is connected to the strap portion 50A, and the strap portion 51 is formed. As a result, the strap portion 51 is erected in order to be connected to the strap portion 51 to which the current collecting portions of the plurality of electrode plates are connected and the adjacent straps arranged in the cell chamber 8 adjacent to the lead storage battery 1. It is possible to manufacture a strap 50 including a cell-to-cell connection portion 52 and a conductive portion 53 which is conductive and is connected to the strap portion 51 and the cell-cell connection portion 52. Therefore, in the lead-acid battery 1 using the manufactured strap 50, the current path in the through connection portion 40 is dispersed on the conductive portion 53 side. As a result, in the through connection portion 40, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion 40 is suppressed. As a result, it is possible to prevent the partition wall 7 from being deformed and melted.

The present invention is not limited to the above embodiment, and can be appropriately modified as long as it does not deviate from the gist of the present invention.

For example, as shown in FIG. 23, when viewed from the direction in which the cell-to-cell connection portion connection surface 52B faces, the through connection portion 40 and the planned connection area 52A are in the vertical direction D4 of the cell-to-cell connection portion 52 with respect to the strap portion 51. It may be an ellipse long in the orthogonal direction. In this way, the through-connection portion 40 or the planned connection area 52A has a long elliptical shape in the direction orthogonal to the erection direction D4 when viewed from the direction in which the cell-to-cell connection portion connection surface 52B faces. The current path in the above can be dispersed in the direction orthogonal to the erection direction D4. As a result, the current density of the through connection portion 40 can be made lower, and the temperature rise of the through connection portion 40 can be further suppressed.

Further, as shown in FIGS. 2 and 24, a plurality of through holes 10 are formed in the partition wall 7 that divides the adjacent cell chambers 8, and the positive electrode strap 14 is housed in one of the adjacent cell chambers 8. And the negative electrode strap 15 accommodated on the other side may be connected by a through connection portion 40 arranged in each of the plurality of through holes 10 formed in the partition wall 7. The partition wall 7 that separates the third cell chamber 22 and the fourth cell chamber 32 is long in the second direction D2, which is the stacking direction of the plurality of positive electrodes 11 and the plurality of negative electrodes 12 in the electrode plate group 3. Therefore, for example, a plurality of through holes 10 may be formed only in the partition wall 7 that separates the third cell chamber 22 and the fourth cell chamber 32. The number of through holes 10 formed in the partition wall 7 may be, for example, two or three.

Further, as shown in FIGS. 2 and 25, the positive electrode strap 14 housed in one of the adjacent cell chambers 8 and the negative electrode strap 15 housed in the other are in the through hole 10 formed in the partition wall 7. Not only may it be connected by the arranged through connection portion 40, but it may also be connected by the upper connection portion 41 that straddles the upper side of the partition wall 7. In this case, for example, in a state where the lid (not shown) of the electric tank 2 is removed, the through connection portion 40 and the upper connection portion 41 are formed, the upper connection portion 41 is sealed with a resin, and then the electric tank 2 is provided. Attach the lid.

Also, the lead-acid battery does not have to be a control valve type lead-acid battery. Further, the number, arrangement, shape, size, etc. of the cell chambers are not particularly limited and may be appropriately changed.

Further, in the method for manufacturing a strap shown in FIGS. 18 to 22, the lead material 85 is placed in the strap cavity 81 in the lead material placement step, and the lead material 85 is melted in the melting step. The process may not be provided, and instead of the melting step, a lead injection step of injecting molten lead into the strap portion cavity 81 may be provided. In such a strap manufacturing method, when the current collector placement step, the base placement step, and the lead injection step are performed, the molten lead injected into the strap portion cavity in the lead injection step causes the strap portion in the current collector placement step. Each of the current collecting portions of the plurality of electrode plates arranged in the cavity and the base portion of the strap component arranged in the strap portion cavity in the base arrangement step are connected, and the strap portion is formed. As a result, the cell-to-cell connection erected in the strap portion to be connected to the strap portion to which the current collectors of the plurality of plates are connected and the adjacent strap arranged in the cell chamber next to the lead storage battery. It is possible to manufacture a strap including a portion and a conductive portion which has conductivity and is connected to the strap portion and the cell-to-cell connection portion. Therefore, in the lead-acid battery using the manufactured strap, the current path in the through connection portion is dispersed on the conductive portion side. As a result, in the through connection portion, the current density becomes low and the Joule heat is suppressed, so that the temperature rise of the through connection portion is suppressed. As a result, it is possible to prevent the partition wall from being deformed and melted.

1 ... lead storage battery, 2 ... electric tank, 3 ... electrode plate group, 4 ... positive electrode terminal, 5 ... negative electrode terminal, 6 ... control valve, 7 ... partition wall, 8 ... cell chamber, 10 ... through hole, 11 ... positive electrode, 12 ... Negative electrode, 14 ... Positive electrode strap, 15 ... Negative electrode strap, 16 ... Current collector, 17 ... Current collector, 18 ... Positive electrode column, 19 ... Negative electrode column, 20 ... First cell chamber group, 21 ... First cell chamber, 22 ... 3rd cell room, 23 ... 5th cell room, 30 ... 2nd cell room group, 31 ... 2nd cell room, 32 ... 4th cell room, 33 ... 6th cell room, 40 ... through connection part, 40A ... current path, 41 ... upper connection part, 50 ... strap, 50A ... strap part, 51 ... strap part, 51A ... base, 51B ... strap part connection surface, 52 ... cell-to-cell connection part, 52A ... planned connection area, 52B ... Cell-to-cell connection part connection surface, 53 ... Conductive part, 60 ... Connection part, 62 ... Recessed part, 63 ... Recessed part, 64 ... Recessed part, 70 ... Strap manufacturing mold, 71 ... Strap cavity, 72 ... Strap part cavity, 73 ... Cell Inter-connection cavity, 74 ... Conductive cavity, 75 ... Molten lead, 80 ... Strap manufacturing mold, 81 ... Strap cavity, 82 ... Positive electrode comb-shaped, 83 ... Negative electrode comb-shaped, 84 ... 85 ... Lead material, 140 ... Through connection part, 140A ... Current path, 150 ... Strap, 151 ... Strap part, 152 ... Cell-to-cell connection part, C ... Current flow, D ... Central axis, E ... Through hole extension area, D1 ... first direction, D2 ... second direction, D3 ... third direction, D4 ... standing direction, D5 ... extension direction, P1 ... upper end position, P2 ... upper end position, P3 ... lower end position, P4 ... center position.

Claims

With the electrolyte
A strap having a strap portion to which a plurality of electrode plates are connected, an inter-cell connection portion erected at an end portion of the strap portion, and a conductive portion connecting the strap portion and the inter-cell connection portion. , Equipped with
The liquid level of the electrolyte is below the strap.
Lead-acid battery.
The strap has a positive electrode strap to which a plurality of positive electrodes are connected and a negative electrode strap to which a plurality of negative electrodes are connected.
The lead-acid battery is
An electric tank having multiple cell chambers partitioned by a partition wall,
Further provided with a through connection portion that penetrates the partition wall and connects the positive electrode strap and the negative electrode strap housed in the adjacent cell chambers.
Each of the positive electrode strap and the negative electrode strap connected by the through connection portion has the conductive portion.
The lead storage battery according to claim 1.
In the vertical direction of the cell-to-cell connection portion with respect to the strap portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the upper end position of the through connection portion.
The lead storage battery according to claim 2.
In the vertical direction of the cell-to-cell connection portion with respect to the strap portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is higher than the lower end position of the through connection portion.
The lead-acid battery according to claim 2 or 3.
The strap portion has a strap portion connecting surface to which the conductive portion is connected facing the cell-to-cell connection portion in the vertical direction side with respect to the strap portion.
The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the strap portion with respect to the cell-cell connection portion.
The conductive portion is arranged on the side of the through connection portion in a direction orthogonal to the erection direction when viewed from the direction in which the cell-to-cell connection portion connection surface faces.
The lead storage battery according to any one of claims 2 to 4.
The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the strap portion with respect to the cell-cell connection portion.
When viewed from the direction in which the cell-to-cell connection portion connection surface faces, the penetration connection portion has an elliptical shape that is long in a direction orthogonal to the vertical direction of the cell-to-cell connection portion with respect to the strap portion.
The lead storage battery according to any one of claims 2 to 5.
The electric tank includes a first cell chamber group in which a part of the plurality of cell chambers is arranged in the first direction, and a second cell chamber group in which the rest of the plurality of cell chambers are arranged in the first direction. Have,
The first cell chamber group and the second cell chamber group are arranged side by side in a second direction orthogonal to the first direction.
In each of the first cell chamber group and the second cell chamber group, a through hole is formed in the partition wall that partitions the cell chambers adjacent to each other in the first direction, and the cell chambers adjacent to each other in the first direction are formed. The positive electrode strap and the negative electrode strap accommodated in each of the above are connected by the through connection portion arranged in the through hole.
The cell chambers arranged at one end of each of the first cell chamber group and the second cell chamber group in the first direction are referred to as a first cell chamber and a second cell chamber, and the first cell chamber is defined as the first cell chamber. And the pole pillar is attached to the positive electrode strap or the negative electrode strap housed in each of the second cell chambers.
The cell chambers arranged at the other side ends of the first cell chamber group and the second cell chamber group in the first direction are designated as the third cell chamber and the fourth cell chamber, and the third cell chamber is defined as the third cell chamber. The through hole is formed in the partition wall that divides the fourth cell chamber, and the positive electrode strap and the negative electrode strap housed in the third cell chamber and the fourth cell chamber are arranged in the through hole. Connected by the through connection
The lead storage battery according to any one of claims 2 to 6.
The height of the conductive portion in the vertical direction of the cell-to-cell connection portion with respect to the strap portion decreases as the distance from the cell-cell connection portion increases.
The lead storage battery according to any one of claims 1 to 7.
The conductive portion has a recess that is locally lowered in the vertical direction of the cell-to-cell connection portion with respect to the strap portion.
The lead-acid battery according to any one of claims 1 to 8.
Control valve type lead acid battery,
The lead-acid battery according to any one of claims 1 to 9.
With a strap for connecting multiple plates,
The cell-to-cell connection portion erected at the end of the strap portion and
A conductive portion that connects the strap portion and the cell-to-cell connection portion is provided.
strap.
The cell-to-cell connection portion has a planned connection area to be connected to a penetration connection portion arranged in a through hole formed in a partition wall of a lead storage battery.
The upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the upper end position of the planned connection region in the vertical direction of the cell-to-cell connection portion with respect to the strap portion.
The strap according to claim 11.
In the vertical direction of the cell-to-cell connection portion with respect to the strap portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is higher than the lower end position of the planned connection region.
The strap according to claim 12.
The upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the central position of the cell-to-cell connection portion in the vertical direction of the cell-to-cell connection portion with respect to the strap portion.
The strap according to claim 12 or 13.
The strap portion has a strap portion connecting surface to which the conductive portion is connected facing the cell-to-cell connection portion in the vertical direction side with respect to the strap portion.
The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the strap portion with respect to the cell-cell connection portion.
The conductive portion is arranged on the side of the planned connection region in a direction orthogonal to the erection direction when viewed from the direction in which the cell-to-cell connection portion connection surface faces.
The strap according to any one of claims 12 to 14.
The height of the conductive portion in the vertical direction of the cell-to-cell connection portion with respect to the strap portion decreases as the distance from the cell-cell connection portion increases.
The strap according to any one of claims 12 to 15.
The conductive portion has a recess that is locally lowered in the vertical direction of the cell-to-cell connection portion with respect to the strap portion.
The strap according to any one of claims 12 to 16.
The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the strap portion with respect to the cell-cell connection portion.
The planned connection area is an elliptical shape that is long in a direction orthogonal to the vertical direction of the cell-to-cell connection portion with respect to the strap portion when viewed from the direction in which the cell-to-cell connection portion connection surface faces.
The strap according to any one of claims 12 to 17.
The base, which is part of the strap for connecting multiple plates,
An inter-cell connection portion erected at the end of the base,
A conductive portion that connects the base portion and the cell-to-cell connection portion.
Strap parts.
The cell-to-cell connection portion has a planned connection area to be connected to a penetration connection portion arranged in a through hole formed in a partition wall of a lead storage battery.
In the vertical direction of the cell-to-cell connection portion with respect to the base portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the upper end position of the planned connection region.
The strap component according to claim 19.
In the vertical direction of the cell-to-cell connection portion with respect to the base portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is higher than the lower end position of the planned connection region.
The strap component according to claim 20.
In the vertical direction of the cell-to-cell connection portion with respect to the base portion, the upper end position of the connection portion between the cell-to-cell connection portion and the conductive portion is lower than the central position of the cell-to-cell connection portion.
The strap component according to claim 20 or 21.
The base portion has a base connection surface to which the conductive portion is connected facing the vertical side of the cell-to-cell connection portion with respect to the base portion.
The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the base portion with respect to the cell-to-cell connection portion.
The conductive portion is arranged on the side of the planned connection region in a direction orthogonal to the erection direction when viewed from the direction in which the cell-to-cell connection portion connection surface faces.
The strap component according to any one of claims 20 to 22.
The height of the conductive portion in the vertical direction of the cell-to-cell connection portion with respect to the base portion decreases as the distance from the cell-cell connection portion increases.
The strap component according to any one of claims 20 to 23.
The conductive portion has a recess that is locally lowered in the vertical direction of the cell-to-cell connection portion with respect to the base portion.
The strap component according to any one of claims 20 to 24.
The cell-to-cell connection portion has a cell-to-cell connection portion connection surface to which the conductive portion is connected facing the extending direction side of the base portion with respect to the cell-to-cell connection portion.
The planned connection area is an elliptical shape that is long in a direction orthogonal to the vertical direction of the cell-to-cell connection portion with respect to the base portion when viewed from the direction in which the cell-to-cell connection portion connection surface faces.
The strap component according to any one of claims 20 to 24.
A cavity corresponding to at least a portion of the strap according to any one of claims 11-18.
Mold for strap manufacturing.
The cavity corresponds to the strap portion.
The strap manufacturing mold according to claim 27.
The strap portion for connecting a plurality of electrode plates, the cell-to-cell connection portion erected on the strap portion to be connected to the adjacent strap arranged in the cell chamber next to the lead storage battery, and the strap portion. A lead injection step of injecting molten lead into a strap cavity corresponding to a strap comprising a conductive portion connected to the cell-to-cell connection portion.
A current collector arranging step of arranging each of the current collectors of the plurality of plates in the strap cavity is provided.
Strap manufacturing method.
The strap cavity is open upward and
The current collector arranging step is performed after the lead injection step.
The strap manufacturing method according to claim 29.
A current collector arranging process in which the current collectors of the plurality of plates are arranged in the strap cavity corresponding to the strap for connecting the plurality of plates.
The cell-to-cell connection portion erected in the base portion to be connected to the base portion that becomes a part of the strap portion and the penetration connection portion arranged in the through hole formed in the partition wall of the lead storage battery, and the base portion. A base arranging step of arranging the base portion of a strap component having a conductive portion connected to the cell-to-cell connection portion in the strap portion cavity, and a base arranging step.
A lead material arranging step of arranging a lead material to be a part of the strap portion in the strap portion cavity,
The present invention comprises a current collector arranging step, a base arranging step, and a melting step of melting the lead material after the lead material arranging step.
Strap manufacturing method.
A current collector arranging process in which the current collectors of the plurality of plates are arranged in the strap cavity corresponding to the strap for connecting the plurality of plates.
The cell-to-cell connection portion erected in the base portion to be connected to the base portion that becomes a part of the strap portion and the penetration connection portion arranged in the through hole formed in the partition wall of the lead storage battery, and the base portion. A base arranging step of arranging the base portion of the strap component having the conductive portion connected to the cell-to-cell connection portion in the strap portion cavity.
After the current collector placement step and the base placement step, a lead injection step of injecting molten lead into the strap portion cavity is provided.
Strap manufacturing method.