JP2021068674A - Power storage device - Google Patents

Abstract

To provide a power storage device that can improve the accuracy of battery monitoring using a monitoring board while reducing the size.SOLUTION: A power storage device includes a first power storage module and a second power storage module, which are stacked in a first direction and connected in series with each other, a first conductive plate located between the first power storage module and the second power storage module, a monitoring board that monitors the status of the first power storage module and the second power storage module, a first metal pin that includes a first terminal fixed to the first conductive plate and a second terminal that comes into surface contact with a first connection terminal of the monitoring board and extends in a second direction intersecting the first direction, and a support that supports the second terminal of the first metal pin.SELECTED DRAWING: Figure 2

Description

One aspect of the present invention relates to a power storage device.

As a conventional power storage device, a power storage device including a plurality of bipolar batteries (storage modules) stacked via a conductive layer is known (see Patent Document 1). Each power storage module includes a laminate formed by laminating a plurality of bipolar electrodes via a separator. On the side surface of the laminated body, a sealing body for sealing between the bipolar electrodes adjacent to each other in the stacking direction is provided, and the electrolytic solution is housed in the internal space formed between the bipolar electrodes.

JP-A-2007-122977

The power storage device as described above may include a monitoring board for monitoring the state of each power storage module. Generally, a monitoring board for monitoring the voltage of each power storage module is provided outside the power storage device. In this case, a wire harness is used to transmit the voltage of each power storage module to the monitoring board, and a connector is used to connect the power storage module and the monitoring board by the wire harness. As a result, the power storage device including the monitoring board may become large. If the wire harness and the connector are not simply used in order to suppress the increase in size of the power storage device, it becomes difficult to establish continuity between the power storage module and the monitoring board, and the monitoring accuracy of the power storage module by the monitoring board may decrease.

An object of one aspect of the present invention is to provide a power storage device capable of improving the monitoring accuracy of a battery by a monitoring substrate while reducing the size.

The power storage device according to one aspect of the present invention is located between the first power storage module and the second power storage module and the first power storage module and the second power storage module, which are stacked in the first direction and connected in series with each other. A second conductive plate that comes into surface contact with a first conductive plate, a monitoring board that monitors the state of the first power storage module and the second power storage module, and a first terminal fixed to the first conductive plate and a first connection terminal of the monitoring board. It includes a first metal pin having terminals and extending in a second direction intersecting the first direction, and a support portion for supporting the second terminal of the first metal pin.

According to this power storage device, the first conductive plate and the monitoring board are electrically connected by the first metal pin. Therefore, the first conductive plate and the monitoring board can be electrically connected to each other without using a wire harness and a connector, so that the power storage device can be miniaturized. In addition, since the second terminal of the first metal pin comes into surface contact with the first connection terminal of the monitoring board, it is easy to establish continuity between the second terminal and the first connection terminal, and the second terminal is connected to the second terminal due to vibration or the like. Separation from the first connection terminal can be suppressed. Further, since the second terminal is supported by the support portion, the misalignment of the second terminal due to vibration or the like can be suppressed. Therefore, since the continuity between the first conductive plate and the monitoring board via the first metal pin can be maintained satisfactorily, the monitoring accuracy of the power storage module by the monitoring board can also be improved.

The first connection terminal may be provided so as to be exposed on the main surface of the board body of the monitoring board.

The second terminal may have an urging portion located between the first connection terminal and the support portion and urging the second terminal toward the first connection terminal. In this case, since the urging portion of the second connection portion presses the second terminal against the first connection terminal, the separation between the first connection terminal and the second terminal due to vibration or the like can be satisfactorily suppressed.

The power storage device is a second connection between a second conductive plate located on the opposite side of the first conductive plate via the first power storage module in the first direction, a third terminal fixed to the second conductive plate, and a monitoring board. It has a fourth terminal that comes into surface contact with the terminal, and further includes a second metal pin that extends in the second direction, and the support portion is a second terminal of the first metal pin and a fourth terminal of the second metal pin. May be supported on the same plane. In this case, since a plurality of metal pins can be supported by a single support portion, it is possible to satisfactorily suppress the increase in size of the power storage device, and it is possible to easily conduct each metal pin and the monitoring substrate.

The power storage device may further include an external base that is separated from the first power storage module and the second power storage module in the second direction and in which the monitoring board and the support portion are arranged. In this case, it is possible to prevent the first power storage module and the second power storage module from interfering with each other when the first metal pin and the monitoring board are electrically connected.

The first power storage module has a bipolar electrode and a sealing material for sealing the bipolar electrode, and the support portion may be provided on the surface of the sealing material. In this case, it is possible to satisfactorily suppress the increase in size of the power storage device.

The first power storage module has a side surface along a first direction and a third direction intersecting the first direction and the second direction, and the monitoring substrate may extend in the extending direction of the side surface. In this case, it is possible to satisfactorily suppress the increase in size of the power storage device.

The first power storage module has a side surface along a first direction and a third direction intersecting the first direction and the second direction, and the monitoring board extends so as to intersect with the side surface and has a support portion. It may be plugged into. In this case, the monitoring board can be easily inserted into the support portion.

According to one aspect of the present invention, it is possible to provide a power storage device capable of improving the monitoring accuracy of the battery by the monitoring substrate while reducing the size.

FIG. 1 is a schematic perspective view showing a power storage device according to an embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II of FIG. FIG. 3 is an enlarged view of a part of the cross section shown in FIG. FIG. 4 is a schematic cross-sectional view showing the internal configuration of the power storage module shown in FIG. FIG. 5 is a perspective view showing a metal pin. FIG. 6 is a diagram for explaining an example of a method for manufacturing a metal pin. FIG. 7 is a perspective view showing a second connection portion of the metal pin. FIG. 8 is a perspective view showing the monitoring board. FIG. 9 is a plan view seen from one main surface side of the monitoring board. FIG. 10 is a plan view seen from the other main surface side of the monitoring board. FIG. 11 is an enlarged view of a part of the monitoring board. 12 (a) is an enlarged perspective view of the slot, and FIG. 12 (b) is an enlarged view of a part of the slot shown in FIG. 12 (a). 13 (a) and 13 (b) are views showing a state in which a metal pin is housed in the slot. FIG. 14 is a perspective view showing the case. FIG. 15A is a plan view of the main body, and FIG. 15B is a perspective view of the main body. 16 (a) is an enlarged view of a part of FIG. 15 (b), and FIG. 16 (b) is a bottom view of FIG. 16 (a). FIG. 17 is an enlarged perspective view of a main part of FIG. FIG. 18A is a perspective view of the cover, and FIG. 18B is a plan view of the cover. 19 (a) to 19 (c) are diagrams for explaining the operation of the metal pin when the case is mounted in the slot. FIG. 20 is a schematic enlarged view showing a state in which the case is mounted in the slot. FIG. 21 is a schematic perspective view showing a part of the power storage device according to the first modification. FIG. 22 is a schematic plan view showing the relationship between the power storage module and the monitoring board according to the first modification. FIG. 23 is a schematic perspective view showing a part of the power storage device according to the second modification. FIG. 24 is a perspective view showing a metal pin according to the third modification. FIG. 25 is an enlarged view of a main part of the metal pin according to the fourth modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate description is omitted.

(Overview of power storage device)
FIG. 1 is a schematic perspective view showing a power storage device according to an embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II of FIG. FIG. 3 is an enlarged view of a part of the cross section shown in FIG. The power storage device 1 shown in FIGS. 1 and 2 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a module laminate 2, a restraint member 3, a plurality of metal pins 100, and a monitoring device 50.

The module laminate 2 includes a plurality of power storage modules 4 and a plurality of conductive plates 5. The plurality of power storage modules 4 are stacked (arranged) along the stacking direction D1 (first direction), and are connected in series with each other. The power storage module 4 is a battery such as a bipolar battery, and has a rectangular shape when viewed from the stacking direction D1. The power storage module 4 is, for example, a secondary battery such as a nickel hydrogen secondary battery and a lithium ion secondary battery, or an electric double layer capacitor. In the following description, a nickel-metal hydride secondary battery will be illustrated as the power storage module 4. Further, in the following, one side of the stacking direction D1 is referred to as an upper side, the other side of the stacking direction D1 is referred to as a lower side, and viewing from the stacking direction D1 may be referred to as a plan view.

Conductive plates 5 are located between two power storage modules 4 adjacent to each other in the stacking direction D1, and these power storage modules 4 are electrically connected to each other via the conductive plates 5. The conductive plates 5 are arranged between two power storage modules 4 adjacent to each other in the stacking direction D1 and on the outer surface of the power storage modules 4 located at the stacking ends. The negative electrode terminal 6 is connected to the conductive plate 5 located at one end of the stacking direction D1 (the lower end of the stacking in this embodiment). The positive electrode terminal 7 is connected to the conductive plate 5 located at the other end of the stacking direction D1 (the upper end of the stacking in this embodiment). The negative electrode terminal 6 and the positive electrode terminal 7 are drawn out from the edge of the conductive plate 5, for example, in the direction D2 (second direction) intersecting the stacking direction D1. By providing such a negative electrode terminal 6 and a positive electrode terminal 7, charging / discharging of the power storage device 1 can be easily performed. In the present embodiment, the stacking direction D1 and the direction D2 are orthogonal to each other.

The conductive plate 5 can also function as a heat sink in the power storage device 1. The conductive plate 5 can release the heat generated in the power storage module 4, for example. The conductive plate 5 is provided with a plurality of flow paths 5a and a plurality of (two in the present embodiment) grooves 5b. The flow path 5a is a through hole for passing a refrigerant such as air. The flow path 5a extends in, for example, a direction D3 (third direction) that intersects the stacking direction D1 and the direction D2, respectively. The plurality of flow paths 5a are arranged along the direction D2. The grooves 5b are provided at both ends of the conductive plate 5 in the direction D2. The number of grooves 5b may be one, and in this case, the grooves 5b are provided at one end on the monitoring device 50 side. The groove 5b extends from one end to the other end of the conductive plate 5 in the direction D3, for example. The flow path 5a may not be provided in the conductive plate 5 at the upper end of the stack and the conductive plate 5 at the lower end of the stack. In the present embodiment, the direction D3 is orthogonal to each of the stacking direction D1 and the direction D2.

As shown in FIG. 3, the conductive plate 5 includes wall portions 5c and wall portions 5d facing each other in the stacking direction D1, and a plurality of partition walls 5e connecting the wall portions 5c and the wall portions 5d. The partition wall 5e is erected between the wall portion 5c and the wall portion 5d. A plurality of flow paths 5a and a plurality of grooves 5b are defined by the wall portion 5c, the wall portion 5d, and the plurality of partition walls 5e. In the following, for convenience of explanation, of the two power storage modules 4, the power storage module 4 (first power storage module) located on the upper side is referred to as “power storage module 4A”, and the power storage module 4 (second power storage module) located on the lower side is referred to. May be referred to as "storage module 4B". In addition, the conductive plate 5 in contact with both the power storage modules 4A and 4B is referred to as a "first conductive plate 5A", and the conductive plate 5 located on the opposite side of the first conductive plate 5A via the power storage module 4A is referred to as a "second conductive plate 5A". Sometimes referred to as a "conductive plate".

In the examples of FIGS. 1 and 2, the area of the conductive plate 5 seen from the stacking direction D1 is smaller than the area of the power storage module 4, but is not limited to this. For example, from the viewpoint of improving heat dissipation, the area of the conductive plate 5 may be the same as the area of the power storage module 4 or larger than the area of the power storage module 4 in a plan view.

The restraint member 3 is a member that applies a restraint load along the stacking direction D1 to the module laminate 2. The restraint member 3 includes a pair of end plates 8 that sandwich the module laminate 2 in the stacking direction D1, and a fastening bolt 9 and a nut 10 that fasten the pair of end plates 8 to each other. The end plate 8 is a rectangular metal plate having an area one size larger than the area of the power storage module 4 and the conductive plate 5 as viewed from the stacking direction D1. An insulating plate F having electrical insulation is provided on the inner surface of the end plate 8. The insulating plate F insulates between the end plate 8 and the conductive plate 5.

An insertion hole 8a is provided at the edge of the end plate 8 at a position outside the module laminate 2. The fastening bolt 9 is passed from the insertion hole 8a of one end plate 8 toward the insertion hole 8a of the other end plate 8, and is attached to the tip portion of the fastening bolt 9 protruding from the insertion hole 8a of the other end plate 8. , The nut 10 is screwed. As a result, the power storage module 4 and the conductive plate 5 are sandwiched by the pair of end plates 8 to be unitized as the module laminate 2, and a restraining load is applied to the module laminate 2 in the stacking direction D1.

The plurality of metal pins 100 are connecting members for electrically connecting the module laminate 2 and the monitoring device 50, and are arranged along the stacking direction D1 and extend along the direction D2. The metal pin 100 has a first connection portion 110 (also referred to as a first terminal) fixed to the corresponding conductive plate 5 and a second connection portion 140 (also referred to as a second terminal or an external terminal) connected to the monitoring device 50. ) And. Therefore, the module laminate 2 and the monitoring device 50 are electrically connected to each other via the metal pin 100 without using a wire harness, a connector, or the like. The first connecting portion 110 is located at one end of the metal pin 100 in the direction D2 and is fixed to the surface of the wall portion 5d, for example. The metal pin 100 may be fixed to the wall portion 5d via a conductive adhesive or the like, or may be welded or welded to the wall portion 5d. The second connecting portion 140 is located at the other end of the metal pin 100 in the direction D2. The specific shape of the metal pin 100, the connection mode between the metal pin 100 and the monitoring device 50, and the like will be described later. Hereinafter, for convenience of explanation, among the plurality of metal pins 100, the metal pin 100 connected to the first conductive plate 5A is referred to as a “first metal pin”, and the metal pin 100 connected to the second conductive plate described above is referred to as a “first metal pin”. It may be referred to as a "second metal pin".

The monitoring device 50 is a device that monitors the state of the module stack 2 included in the power storage device 1. The monitoring device 50 includes, for example, a circuit board (a monitoring board 200 described later) for monitoring the state of each power storage module 4. Details of the monitoring device 50 will be described later.

(Power storage module)
Next, the configuration of the power storage module 4 will be described in detail. FIG. 4 is a schematic cross-sectional view showing the internal configuration of the power storage module shown in FIG. As shown in FIG. 4, each of the plurality of power storage modules 4 includes an electrode laminate 11 and a sealant 12 that seals the electrode laminate 11. The electrode laminate 11 has a plurality of separators 13, a plurality of bipolar electrodes 14, a negative electrode terminal electrode 18, and a positive electrode terminal electrode 19. In the present embodiment, the stacking direction of the electrode laminated body 11 coincides with the stacking direction D1 of the module laminated body 2. The electrode laminate 11 has a side surface 11a extending in the stacking direction D1.

The separator 13 is formed in a sheet shape, for example. Examples of the separator 13 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), and a woven fabric or a non-woven fabric made of polypropylene and methyl cellulose. The separator 13 may be reinforced with a vinylidene fluoride resin compound. The separator 13 may have a bag shape.

The negative electrode terminal electrode 18, the plurality of bipolar electrodes 14, and the positive electrode terminal electrodes 19 (plurality of electrodes) are laminated in this order along the stacking direction D1. Between two bipolar electrodes 14 adjacent to each other in the stacking direction D1, between the negative electrode terminal 18 and the bipolar electrode 14 adjacent to each other in the stacking direction D1, and between the positive electrode terminal 19 and the bipolar electrode 14 adjacent to each other in the stacking direction D1. Separator 13 is arranged in each of the space 14 and the separator 13. Each of the plurality of bipolar electrodes 14 includes an electrode plate 15, a positive electrode 16, and a negative electrode 17. The electrode plate 15 is made of, for example, a metal foil made of nickel or a nickel-plated steel plate, and has a rectangular shape. The electrode plate 15 includes an upper surface 15a and a lower surface 15b opposite to the upper surface 15a. The peripheral edge portion 15c of the electrode plate 15 is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated.

The positive electrode 16 is provided on the upper surface 15a of the electrode plate 15. The positive electrode 16 is a positive electrode active material layer formed by applying a positive electrode active material to the upper surface 15a. Examples of the positive electrode active material constituting the positive electrode 16 include nickel hydroxide. The negative electrode 17 is provided on the lower surface 15b of the electrode plate 15. The negative electrode 17 is a negative electrode active material layer formed by applying a negative electrode active material to the lower surface 15b. Examples of the negative electrode active material constituting the negative electrode 17 include a hydrogen storage alloy. In the present embodiment, in a plan view, the formation region of the negative electrode 17 on the lower surface 15b of the electrode plate 15 is one size larger than the formation region of the positive electrode 16 on the upper surface 15a of the electrode plate 15.

In the electrode laminate 11, the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of one of the bipolar electrodes 14 adjacent to the stacking direction D1 with the separator 13 interposed therebetween. In the electrode laminate 11, the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of the other bipolar electrode 14 adjacent to the stacking direction D1 with the separator 13 interposed therebetween.

The negative electrode terminal electrode 18 is arranged at one end 11b of the electrode laminate 11 in the stacking direction D1. The negative electrode terminal electrode 18 includes an electrode plate 15 and a negative electrode 17 provided on the lower surface 15b of the electrode plate 15. The negative electrode 17 of the negative electrode terminal electrode 18 faces the positive electrode 16 of the bipolar electrode 14 located at one end in the stacking direction D1 via the separator 13. One of the conductive plates 5 adjacent to the power storage module 4 is in contact with the upper surface 15a of the electrode plate 15 of the negative electrode terminal electrode 18.

The positive electrode terminal electrode 19 is arranged at the other end 11c on the side opposite to one end 11b of the electrode laminate 11 in the stacking direction D1. The positive electrode terminal electrode 19 includes an electrode plate 15 and a positive electrode 16 provided on the upper surface 15a of the electrode plate 15. The positive electrode 16 of the positive electrode terminal electrode 19 faces the negative electrode 17 of the bipolar electrode 14 located at the other end of the stacking direction D1 via the separator 13. The other conductive plate 5 adjacent to the power storage module 4 is in contact with the lower surface 15b of the electrode plate 15 of the positive electrode terminal electrode 19.

The sealing body 12 is a sealing material that seals the separator 13 and the bipolar electrode 14, and is formed in, for example, a rectangular cylinder. The sealing body 12 is formed of an insulating resin material. Examples of the resin material constituting the sealing body 12 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like. The sealing body 12 is provided around the electrode laminated body 11, forms an internal space V in the electrode laminated body 11, and seals the internal space V. Specifically, the sealing body 12 is configured to hold the peripheral edge portion 15c of the electrode plate 15 on the side surface 11a of the electrode laminated body 11 extending in the stacking direction D1 and to surround the side surface 11a. The sealing body 12 seals between two bipolar electrodes 14 adjacent to each other in the stacking direction D1.

The sealing body 12 has a plurality of primary sealing bodies 21 and a secondary sealing body 22. The primary sealing body 21 is continuously provided on the peripheral edge portion 15c of the electrode plate 15 over the entire circumference (all sides) of the electrode plate 15. The secondary sealing body 22 is provided so as to surround the plurality of primary sealing bodies 21 from the outside. The secondary encapsulant 22 is provided around the electrode laminate 11 and the plurality of primary encapsulants 21 and constitutes an outer wall (housing) of the power storage module 4. The secondary sealing body 22 is formed by injection molding of a resin, and extends along the stacking direction D1 over the entire length of the electrode laminated body 11. The secondary sealing body 22 has a tubular shape (annular shape) extending in the axial direction in the stacking direction D1. The secondary encapsulant 22 is welded (bonded) to the end surface of the primary encapsulant 21 on the outer edge side by, for example, heat during injection molding.

The secondary encapsulant 22, together with the primary encapsulant 21, is between two bipolar electrodes 14 adjacent to each other in the stacking direction D1, between the negative electrode termination electrodes 18 and the bipolar electrodes 14 adjacent to each other in the stacking direction D1, and , The positive electrode terminal 19 and the bipolar electrode 14 adjacent to each other in the stacking direction D1 are sealed. As a result, an airtightly partitioned internal space V is formed between the two bipolar electrodes 14, between the negative electrode terminating electrode 18 and the bipolar electrode 14, and between the positive electrode terminating electrode 19 and the bipolar electrode 14. Has been done. Each internal space V contains an electrolytic solution (not shown) composed of an alkaline aqueous solution such as an aqueous potassium hydroxide solution. The electrolytic solution is impregnated in the separator 13, the positive electrode 16 and the negative electrode 17.

(Metal pin)
Next, in addition to FIGS. 1, 2 and 4, the configuration of the metal pin 100 will be described in detail with reference to FIGS. 5 to 7. FIG. 5 is a perspective view showing the metal pin 100. FIG. 6 is a diagram for explaining an example of a method for manufacturing the metal pin 100. FIG. 7 is a perspective view showing the second connection portion 140 of the metal pin 100. 5 to 7 show the XYZ coordinate system for convenience of explanation. In the usage mode of the metal pin 100 of the present embodiment (that is, when each metal pin 100 is arranged as shown in FIG. 2), the Y-axis direction (first direction in the description of the metal pin 100) is in the direction D2. Correspondingly, the X-axis direction (second direction in the description of the metal pin 100) corresponds to the direction D3, and the Z-axis direction (third direction in the description of the metal pin 100) corresponds to the stacking direction D1.

The metal pin 100 is a conductive member made of metal. The metal pin 100 monitors the voltage of each of the conductive plate 5 (conductive member, first member) located between the power storage modules 4 adjacent to each other or at the stacking end of the module stack 2 and the plurality of power storage modules 4. It is a member that electrically connects the monitoring board 200 (second member) having a plurality of connection terminals 221,222 (see FIGS. 8 to 11 and details will be described later). Specifically, one metal pin 100 electrically connects one conductive plate 5 and a set of connection terminals 221,222 corresponding to the conductive plate 5.

As shown in FIG. 5, the metal pin 100 is obtained by, for example, cutting, bending, or the like on a flat metal plate having a certain thickness. The metal pin 100 includes a first connecting portion 110, a first extending portion 120, a second extending portion 130, and a second connecting portion 140.

The first connecting portion 110 corresponds to one end of the metal pin 100 and is a portion that is electrically connected to the corresponding conductive plate 5. As described above, in the present embodiment, the first connecting portion 110 is fixed to the surface of the wall portion 5d of the conductive plate 5.

The first extending portion 120 is a portion extending from the first connecting portion 110 along the Y-axis direction. In the present embodiment, the first connecting portion 110 can be regarded as a part of the first extending portion 120 (the end portion of the first extending portion 120). The width of the first extending portion 120 in the X-axis direction is larger than the width of the first extending portion 120 in the Z-axis direction. Specifically, the first extending portion 120 is a plate-shaped portion in which the main surface of the metal pin 100 is along the X-axis direction and the Y-axis direction. That is, in most of the first extending portion 120 (specifically, the portion excluding the bent portion 121 described later), the plate thickness direction of the metal pin 100 coincides with the Z-axis direction.

The first extending portion 120 has a bent portion 121 that bends in the Z-axis direction. In the present embodiment, as an example, the bent portion 121 is formed at a substantially central portion of the first extending portion 120 in the Y-axis direction. The bent portion 121 connects the portion 120a of the first extending portion 120 on the first connecting portion 110 side and the portion 120b of the first extending portion 120 on the second extending portion 130 side. Here, as an example, the bent portion 121 connects the portion 120a and the portion 120b so that the height position of the main surface of the portion 120b deviates from the height position of the main surface of the portion 120a. However, the position and shape of the bent portion 121 are not limited to the above-mentioned form. For example, the bent portion 121 may be formed in a V shape like the bent portion 131 described later. In this case, the height position of the main surface of the portion 120a and the height position of the main surface of the portion 120b may coincide with each other.

The second extending portion 130 is a portion further extending along the Y-axis direction from the end portion of the first extending portion 120 opposite to the first connecting portion 110. The width of the second extending portion 130 in the X-axis direction is smaller than the width of the second extending portion 130 in the Z-axis direction. Specifically, the second extending portion 130 is a plate-shaped portion in which the main surface of the metal pin 100 is along the Y-axis direction and the Z-axis direction. That is, in most of the second extending portion 130 (specifically, the portion excluding the bent portion 131 described later), the plate thickness direction of the metal pin 100 coincides with the X-axis direction.

The second extending portion 130 has a bent portion 131 that bends in the X-axis direction. In the present embodiment, as an example, the bent portion 131 is formed on the side of the first extending portion 120 with respect to the central portion of the second extending portion 130 in the Y-axis direction. The bent portion 131 is bent in a V shape when viewed from the Z-axis direction. However, the position and shape of the bent portion 131 are not limited to the above-mentioned form.

A recess 132 is provided at the end 130a of the second extending portion 130 in the Z-axis direction (in the present embodiment, the lower end in the stacking direction D1). The recess 132 is formed, for example, by cutting out a part of the end 130a of the second extending portion 130. In the present embodiment, the recess 132 is provided on the second connecting portion 140 side with respect to the bent portion 131, and has a constant width in the Y-axis direction. The recess 132 may not be provided.

An uneven shape portion 133 is provided at the end portion 130a of the second extending portion 130. Specifically, in the portion of the end portion 130a where the recess 132 is not formed, a concave-convex shape portion 133 in which a plurality of protrusions 133a are continuously (periodically) formed is provided. In the present embodiment, the concave-convex shape portion 133 is formed on the first extending portion 120 side of the concave portion 132. Further, a part of the concave-convex shape portion 133 is provided in the bent portion 131. However, the position where the concave-convex shape portion 133 is formed is not limited to the above. For example, the concave-convex shape portion 133 may be provided only in a portion other than the bent portion 131, or may be provided only in the bent portion 131. Further, the concave-convex shape portion 133 may be provided on the second connection portion 140 side with respect to the concave portion 132. The concave-convex shape portion 133 may not be provided.

While the height position (position in the Z-axis direction) of the end 130a of the second extending portion 130 is constant, the end 130b (this) opposite to the end 130a of the second extending portion 130. In the embodiment, the height position of the upper end portion in the stacking direction D1 is directed from the start point position of the bent portion 131 (the end portion of the bent portion 131 on the first extending portion 120 side) toward the second connecting portion 140 side. Is changing. Specifically, the position of the end portion 130b gradually moves upward in the stacking direction D1 from the start point position of the bent portion 131 toward the second connecting portion 140 side. In other words, the width of the second extending portion 130 in the Z-axis direction (that is, the length from the end portion 130a to the end portion 130b) becomes wider from the starting point position of the bending portion 131 toward the second connecting portion 140 side. It gradually increases from w1 to the width w2 (> w1). The width w2 coincides with the width of the first extending portion 120 in the X-axis direction.

The first extending portion 120 and the second extending portion 130 have a region A that overlaps with each other along the Y-axis direction. That is, in the region A, a part of the first extending portion 120 and a part of the second extending portion 130 are formed within the width of the first extending portion 120 in the X-axis direction. The end 130c of the second extending portion 130 on the first extending portion 120 side corresponds to the end of the area A on the first connecting portion 110 side, and is the first connecting portion 110 of the first extending portion 120. The opposite end 120c (that is, the end farthest from the first connection 110 in the Y-axis direction) corresponds to the end of the region A on the second connection 140 side.

The metal pin 100 including the first extending portion 120 and the second extending portion 130 as described above is integrally formed of, for example, a common plate-shaped member. As shown in FIG. 6, as an example, the metal pin 100 can be manufactured by processing (cutting, bending, etc.) on one rectangular plate-shaped metal plate MP. Specifically, the metal plate MP is cut along the cutting line CL1 corresponding to the end 130c of the second extending portion 130, and the cutting line CL2 corresponding to the end 120c of the first extending portion 120. Cut along. Further, a part of one end of the metal plate MP (the end corresponding to the end 130a of the second extending portion 130) is cut off so that the recess 132 and the concave-convex shape portion 133 described above are formed. .. Specifically, the portion MP1 corresponding to the recess 132 and the portion MP2 corresponding to the concave-convex shape portion 133 (that is, the portion corresponding to the space formed between the adjacent protrusions 133a) are cut off. Further, as described above, the metal plate MP has a shape in which the width of the second extending portion 130 in the Z-axis direction gradually increases from the starting point position of the bent portion 131 toward the second connecting portion 140 side. A part (partial MP3) of the other end (the end corresponding to the end 130b of the second extending portion 130) is excised. Further, the portion on the right side (Y-axis positive direction side) of the metal plate MP cutting line CL1 is located at a substantially central position in the X-axis direction of the metal plate MP, along the extending direction (Y-axis direction) of the metal plate MP. It can be bent about 90 degrees around the axis. Further, by bending the metal plate MP at a predetermined position, a bent portion 121, a bent portion 131, and a second connecting portion 140 described later are formed. By the above processing, the metal pin 100 including the first extending portion 120 and the second extending portion 130 is manufactured from the common plate-shaped member (metal plate MP).

The second connecting portion 140 is a portion of the second extending portion 130 provided on the side opposite to the first extending portion 120 side. The second connecting portion 140 corresponds to the other end of the metal pin 100. The second connection unit 140 is electrically connected, for example, by making surface contact with the corresponding connection terminals 221,222. The second connecting portion 140 is connected to the end portion of the second extending portion 130 opposite to the first extending portion 120 via the corner portion 150. The corner portion 150 is a portion that bends at approximately 90 degrees so as to change the extending direction of the metal pin 100 from the Y-axis direction to the X-axis direction. The outer portion of the corner portion 150 (that is, the surface of the corner portion 150 located on the other end side of the metal pin 100) is an accommodating member for accommodating the monitoring substrate 200 (in this embodiment, the eaves portion 312 of the slot 300). And the back plate portion 313) are pressed against the direction D2 and the direction D3 (see FIG. 13B described later) to be fixed to the accommodating member.

As shown in FIG. 7, the second connecting portion 140 has a first portion 141, a second portion 142, a third portion 143, a fourth portion 144, and a fifth portion 145. The first portion 141 is a portion extending from the corner portion 150 along the X-axis direction. That is, the first portion 141 is a portion connected to the second extending portion 130 via the corner portion 150. The first portion 141 extends in a direction away from the corner portion 150. The second portion 142 is a portion connected to the end portion of the first portion 141 (the end portion on the side opposite to the end portion on the corner portion 150 side) and extends along the Y-axis direction. The second portion 142 extends from the end portion of the first portion 141 in a direction approaching the first connecting portion 110. The third portion 143 is a portion connected to the end portion of the second portion 142 (the end portion opposite to the end portion on the second portion 142 side) and extends along the X-axis direction. The third portion 143 extends from the end portion of the second portion 142 in a direction approaching the second extending portion 130. The fourth portion 144 is a portion connected to the end portion of the third portion 143 (the end portion on the side opposite to the end portion on the second portion 142 side) and extends along the Y-axis direction. The fourth portion 144 extends from the end portion of the third portion 143 in a direction approaching the first connecting portion 110. The fifth portion 145 is a portion connected to the end portion of the fourth portion 144 (the end portion opposite to the end portion on the third portion 143 side) and extends along the X-axis direction. The fifth portion 145 extends from the end of the fourth portion 144 in a direction away from the second extending portion 130. The second connecting portion 140 has a shape that is bent in a substantially S shape when viewed from the Z-axis direction by the above-mentioned first portion 141 to fifth portion 145.

The first portion 141 is formed with a bent portion 141a that bends toward the first extending portion 120 in the Y-axis direction. By contacting the top of the bent portion 141a with the third portion 143, the third portion 143 is supported with respect to the first portion 141. The third portion 143 and the fifth portion 145 face each other in the Y-axis direction. A contact surface 143a for connecting to one connection terminal 221 of the monitoring board 200 is formed on the surface of the third portion 143 facing the fifth portion 145. The contact surface 143a is a surface extending along the X-axis direction and the Z-axis direction and intersecting or perpendicular to the Y-axis direction. In the present embodiment, as an example, the contact surface 143a is the top surface of the convex portion formed by embossing or the like on the surface of the third portion 143 facing the fifth portion 145. Further, as shown in FIG. 5, a contact surface 145a for connecting to the other connection terminal 222 of the monitoring board 200 is formed on the surface of the fifth portion 145 facing the third portion 143. The contact surface 145a has the same shape as the contact surface 143a, and is provided at a position facing the contact surface 143a in the Y-axis direction. Therefore, the contact surface 145a is also a surface that extends along the X-axis direction and the Z-axis direction and intersects or is perpendicular to the Y-axis direction. As a result, when a portion of the monitoring board 200 provided with a set of connection terminals 221,222 (hereinafter referred to as "inserted portion") is inserted between the third portion 143 and the fifth portion 145, The connection terminal 221 comes into contact with the contact surface 143a, and the connection terminal 222 comes into contact with the contact surface 145a.

Here, when the inserted portion is inserted between the third portion 143 and the fifth portion 145 so as to abut the contact surface 143a, the third portion 143 is pressed toward the first portion 141. .. At this time, the bent portion 141a and the second portion 142 are elastically deformed so as to be crushed. At this time, the restoring force of the bent portion 141a and the second portion 142 acts to press the third portion 143 toward the inserted portion. That is, the bent portion 141a and the second portion 142 function as an urging portion that urges the contact surface 143a toward the connection terminal 221. Further, when the fifth portion 145 is pressed toward the inserted portion by another member (in the present embodiment, the protruding portion 440 described later), the contact surface 145a is also pressed toward the connection terminal 222.

(Monitoring device)
Next, the configuration of the monitoring device 50 will be described in detail. As shown in FIGS. 1 and 2, the monitoring device 50 is a device that monitors the state of each power storage module 4 included in the power storage device 1. For example, the monitoring device 50 monitors the state of each power storage module 4 by constantly or intermittently measuring the voltage (terminal voltage) of each power storage module 4. The monitoring device 50 has an external base 30 and a composite case 40 arranged on the external base 30. The external base 30 is a member to which the composite case 40 is fixed. That is, the external base 30 is a member on which each constituent requirement (for example, a monitoring board 200, a slot 300, a case 400, etc., which will be described later) included in the composite case 40 is arranged. The outer base 30 is separated from the module laminate 2 in the direction D2. The outer base 30 is, for example, a resin plate-shaped member (resin substrate) having a main surface 30a extending along the stacking direction D1 and the direction D3. The main surface 30a is located on the side opposite to the power storage module 4 side in the direction D2. The external base 30 is fixed to the pair of end plates 8 via a fixing member 31 such as a bolt. In the present embodiment, the main surface 30a of the external base 30 is parallel or substantially parallel to the side surface 4a along the stacking direction D1 and the direction D3 in the power storage module 4. Therefore, it can be said that the external base 30 extends in the extending direction of the side surface 4a.

The outer base 30 is provided with a plurality of through holes 30b extending along the direction D2. Each through hole 30b is arranged along the stacking direction D1. In the stacking direction D1 and the direction D3, the size of the through hole 30b is larger than the size of the metal pin 100 joined to the conductive plate 5. Therefore, the corresponding metal pin 100 can be inserted into each through hole 30b. The second connection portion 140 of the metal pin 100 inserted through the through hole 30b is located on the opposite side of the module laminate 2 with the outer base 30 interposed therebetween in the direction D2. That is, the second connecting portion 140 is located on the main surface 30a in the direction D2.

The composite case 40 is an aggregate of a plurality of types of cases. In the present embodiment, the composite case 40 has a slot 300 fixed to the external base 30, and a case 400 that is detachably attached to the slot 300 and accommodates the monitoring board 200. Hereinafter, the configurations of the monitoring board 200, the slot 300, and the case 400 will be described in order. In the description of the monitoring board 200, the slot 300, and the case 400, the above-mentioned stacking directions D1 and directions D2 and D3 are appropriately used.

(Monitoring board)
The configuration of the monitoring board 200 will be described in detail with reference to FIGS. 8 to 11. FIG. 8 is a perspective view showing the monitoring board 200. FIG. 9 is a plan view of the monitoring board 200 as viewed from one main surface 211 side. FIG. 10 is a plan view of the monitoring board 200 as viewed from the other main surface 212 side. FIG. 11 is an enlarged view of a part of the monitoring board 200.

The monitoring board 200 is a circuit board for monitoring (measuring) the voltage (terminal voltage) of each of the plurality of stacked power storage modules 4. As shown in FIGS. 8 to 11, the monitoring board 200 has a board portion 210 which is a board body. The substrate portion 210 is formed in a substantially rectangular plate shape, and has main surfaces 211 and 212 located on opposite sides of each other. The substrate portion 210 is provided with through holes 210a (two through holes 210a as an example in this embodiment) for inserting a fixing member (screw or the like) for fixing the monitoring substrate 200 to the case 400 (accommodating member). It is provided. Further, a rectangular notch 210b is provided at one corner of one end of the substrate 210 (the end opposite to the end 210c described later). However, the shape of the substrate portion 210 is not limited to the above form. For example, the number and position of the through holes 210a may be changed as needed, and the position and shape of the notch 210b may be changed as needed. Further, the through hole 210a and the notch 210b may be omitted when unnecessary.

As shown in FIGS. 8 and 9, the main surface 211 of the substrate portion 210 has a predetermined interval (a portion along one end 210c of the substrate portion 210) of the main surface 211. A plurality of (eight in this embodiment) connection terminals 221 arranged at an interval d1) in FIG. 11 are provided. The connection terminal 221 is provided so as to be exposed on the main surface 211. As a result, electrical connection with the connection terminal 221 is achieved by surface contact from the thickness direction of the substrate portion 210 (that is, the direction perpendicular to the main surfaces 211 and 12 and hereinafter simply referred to as the "thickness direction"). It is possible. As an example, the connection terminal 221 has a rectangular shape when viewed from the thickness direction. The connection terminal 221 is electrically connected to the contact surface 143a of the second connection portion 140 of the metal pin 100.

As shown in FIG. 10, the main surface 212 of the substrate portion 210 is also arranged at a predetermined interval (interval d1 in FIG. 11) along one edge portion (portion along the end portion 210c) of the main surface 212. A plurality (8) connection terminals 222 are provided. The connection terminal 222 is provided so as to be exposed on the main surface 212, similarly to the connection terminal 221. As a result, it is possible to make an electrical connection with the connection terminal 222 by surface contact from the thickness direction. The connection terminal 222 has the same shape as the connection terminal 221 (rectangular in the present embodiment) when viewed from the thickness direction. The connection terminal 222 is electrically connected to the contact surface 145a of the second connection portion 140 of the metal pin 100.

As shown in FIGS. 9 and 10, at the edges (portions along the ends 210c) of the main surfaces 211 and 212, there is a space penetrating in the thickness direction between the adjacent connection terminals 221,222. The recess 230 is provided so that S is formed. In the present embodiment, each recess 230 has a shape in which a part of the end 210c of the substrate 210 is cut out in a rectangular shape. As a result, a rectangular space S is formed between the adjacent connection terminals 221,222 when viewed from the thickness direction.

Each connection terminal 222 is located on the opposite side of each connection terminal 221. That is, when viewed from the thickness direction, each connection terminal 221 and each connection terminal 222 overlap each other. Pairs of connection terminals 221,222 arranged at overlapping positions in the thickness direction are electrically connected to the same metal pin 100. In the present embodiment, eight pairs of connection terminals 221,222 are formed on the substrate portion 210, and it is possible to establish electrical connection with eight metal pins (that is, eight conductive plates 5). ing.

Specifically, as shown in FIGS. 2 and 3, each of the plurality (8) conductive plates 5 laminated in the stacking direction D1 is connected to the first connecting portion 110 of the metal pin 100, and each metal is connected. The second connection 140 (contact surfaces 143a, 145a) of the pin 100 is connected to the corresponding pair of connection terminals 221,222. More specifically, a portion provided with connection terminals 221,222 of the monitoring board 200 is inserted between the third portion 143 and the fifth portion 145 of the second connection portion 140 of the metal pin 100 described above. (See also FIG. 7 and FIG. 19 (c)). As a result, the main surface 211 of the substrate portion 210 faces the third portion 143, and the connection terminal 221 comes into surface contact with the contact surface 143a of the third portion 143. Further, the main surface 212 of the substrate portion 210 faces the fifth portion 145, and the connection terminal 222 comes into surface contact with the contact surface 145a of the fifth portion 145. At this time, as described above, the elastically deformable third portion 143 and the fifth portion 145 sandwich the portion of the monitoring board 200 provided with the connection terminals 221,222. As a result, the contact pressure between the contact surfaces 143a and 145a and the connection terminals 221,222 is appropriately secured.

Here, the arrangement interval (interval d1 in FIG. 11) of the plurality of connection terminals 221 (or the plurality of connection terminals 222) is the arrangement interval of the plurality of power storage modules 4 in the stacking direction D1 (that is, the arrangement of the plurality of conductive plates 5). Interval) is set to be equal to. As a result, the connection terminals 221,222 provided on the monitoring board 200 and the members connected to the connection terminals 221,222 (in the present embodiment, the conductive plates 5 arranged between the adjacent power storage modules 4) The positional relationship between the two is shared between each pair of the connection terminals 221,222 and the conductive plate 5. For example, as shown in FIG. 2, when the monitoring board 200 is arranged so that the arrangement direction of the plurality of connection terminals 221,222 and the stacking direction D1 coincide with each other, the connection terminals 221,222 and the conductive plate corresponding to each other are arranged. 5 and 5 will be arranged at the same height position. As a result, the standards (shape, dimensions, etc.) of the conductive members for electrically connecting the connection terminals 221 and 222 and the conductive plates 5 can be standardized. That is, a common metal pin 100 can be used for all pairs (pairs of connection terminals 221,222 and conductive plate 5). As a result, the manufacturing cost of the conductive member (metal pin 100) can be reduced, and the cost related to the voltage measurement using the monitoring board 200 can be reduced.

The monitoring board 200 has a measurement circuit 240 mounted on the board unit 210. The measurement circuit 240 is composed of, for example, an ECU (Electronic Control Unit) or the like. The measuring circuit 240 measures the voltage between adjacent connection terminals. Specifically, the measurement circuit 240 is electrically connected to each connection terminal 221,222. The measurement circuit 240 transmits a voltage signal regarding the potential of each conductive plate 5 (that is, the potential of the positive electrode terminal 19 or the negative electrode 18 of the power storage module 4 adjacent to the conductive plate 5) via the connection terminals 221,222. To get. Then, the measurement circuit 240 calculates each power storage by calculating the potential difference between the adjacent connection terminals (that is, the potential difference corresponding to the terminal voltage of the power storage module 4 between the adjacent conductive plates 5) based on the voltage signal. The terminal voltage of the module 4 is derived.

Next, with reference to FIG. 11, the positional relationship between the connection terminal 221 and the recess 230 will be described. The positional relationship between the connection terminal 222 and the recess 230 is the same as the positional relationship between the connection terminal 221 and the recess 230 in FIG.

As shown in FIG. 11, the end 221a on the outside (that is, on the end 210c side) of the connection terminal 221 is along the end 210c. The end portion 221b opposite to the end portion 221a of the connection terminal 221 is located outside the bottom portion 230b of the recess 230 (that is, on the end portion 210c side). That is, the length L1 from the end 221a to the end 221b of the connection terminal 221 is smaller than the depth L2 of the recess 230 (that is, the length from the end 210c to the bottom 230b of the recess 230). Further, the end portion 221c (that is, the end portion along the depth direction of the recessed portion 230) connecting the end portions 221a and 221b of the connection terminal 221 is separated from the side end portion 230a of the recessed portion 230. As a result, the distance W between the adjacent connection terminals 221 (that is, the distance between the end portions 221c facing each other) is larger than the width of the recess 230 (the distance between the side end portions 230a facing each other).

Further, in a state where the monitoring substrate 200 is housed in the case 400, an insulating partition wall 450 (details will be described later) is arranged (inserted) in each space S formed by each recess 230. The partition wall 450 is inserted to the back side of the end portion 221b of the connection terminal 221 (that is, the side closer to the bottom portion 230b of the recess 230). That is, in a state where the monitoring board 200 is housed in the case 400, the end portion 221b of the connection terminal 221 is the end portion of the partition wall 450 arranged in the space S on the monitoring board 200 side (that is, when viewed from the thickness direction). It is located on the outside (that is, on the end 210c side) from the end (the end facing the bottom 230b).

(slot)
FIG. 12A is an enlarged perspective view of the slot. FIG. 12B is an enlarged view of a part of the slot shown in FIG. 12A. In FIG. 12A, a part of the slot is omitted. 13 (a) and 13 (b) are views showing a state in which a metal pin is housed in the slot. The slots 300 shown in FIGS. 12 (a) and 12 (b) and 13 (a) and 13 (b) are structures for accommodating and supporting the second connection portion 140 which is an external terminal of the plurality of metal pins 100 (the first). 2 cases or support portions), which are fixed to the main surface 30a of the external base 30. The slot 300 is also a structure into which the connection terminals 221, 222 of the monitoring board 200 and a part of the case 400 are inserted. Therefore, the slot 300 has an insertion port 304 into which the monitoring board 200 and the case 400 are inserted. In the present embodiment, the slot 300 is a resin member integrally formed with the external base 30, a plurality of first terminal guide portions 301, and a pair of second terminal guides adjacent to the first terminal guide portion 301. It has a unit 302 and a connection unit 303 that connects the first terminal guide unit 301 and the second terminal guide unit 302. Hereinafter, each configuration requirement of the slot 300 will be described on the premise that the external base 30 is fixed to the end plate 8 and the slot 300 accommodates the second connection portion 140 of the metal pin 100.

Each of the plurality of first terminal guide portions 301 is a guide that guides the second connection portion 140 of the corresponding metal pin 100 to a predetermined position in the slot 300, and is provided on the main surface 30a of the external base 30. .. By providing the first terminal guide portion 301, the second connection portion 140 of the metal pin 100 which passes through the through hole 30b and is located on the main surface 30a is guided and accommodated at a predetermined position inside the slot 300. To. Each of the plurality of first terminal guide portions 301 has a partition wall 311 (second partition wall), an eaves portion 312 integrated with the partition wall 311 and a back plate portion 313 integrated with the partition wall 311 and the eaves portion 312. The plurality of first terminal guide portions 301 have the same shape as each other.

The partition wall 311 is a portion that partitions the insertion port 304 and exhibits insulating properties, and is erected from the main surface 30a of the external base 30 along the direction D2. When the second connecting portion 140 of the metal pin 100 is accommodated in the slot 300, the partition wall 311 is arranged between the adjacent second connecting portions 140. As a result, the partition wall 311 partitions the two adjacent through holes 30b in the stacking direction D1, separates the adjacent second connecting portions 140 from each other, and moves the second connecting portion 140 of the metal pin 100 in the stacking direction D1. Has the function of regulating. One end of the partition wall 311 in the direction D3 is in contact with the connecting portion 303. In the stacking direction D1, the partition walls 311 and the through holes 30b are arranged alternately. Therefore, the movement of the second connecting portion 140 sandwiched between the two partition walls 311 in the stacking direction D1 is restricted along one side and the other side of the stacking direction D1. The thickness of the partition wall 311 along the stacking direction D1 is, for example, more than half of the distance between two adjacent through holes 30b in the stacking direction D1. The height of the partition wall 311 along the direction D2 is, for example, greater than the sum of the dimensions of the second connecting portion 140 of the metal pin 100 along the direction D2 in the open state and the thickness of the eaves portion 312 along the direction D2. high. The length of the partition wall 311 along the direction D3 is shorter than, for example, the length of the through hole 30b along the direction D3, but is not limited thereto.

The eaves portion 312 is a portion that regulates the movement of the second connecting portion 140 of the metal pin 100 in the direction D2 and supports the second connecting portion 140, and is one side (upper side) in the stacking direction D1 from the tip end side of the partition wall 311. ) Prolongs. The eaves portion 312 overlaps the through hole 30b adjacent to the partition wall 311 in the direction D2 and exhibits insulating properties. When the second connecting portion 140 is accommodated in the slot 300, the eaves portion 312 covers the entire second connecting portion 140 when viewed from the direction D2. One end of the eaves portion 312 in the direction D3 is in contact with the connecting portion 303, similarly to the partition wall 311. At the other end of the eaves portion 312 in the direction D3, a protruding portion 312a toward the through hole 30b in the direction D2 is provided. The protruding portion 312a is a portion that restricts the movement of the second connecting portion 140 in the direction D3, and functions as a locking portion that can be locked to the second connecting portion 140. By providing the protruding portion 312a, it is possible to prevent the second connecting portion 140 housed in the slot 300 from being exposed to the outside of the slot 300. The amount of protrusion of the protruding portion 312a along the direction D2 may be larger than, for example, the thickness of the metal plate MP which is a constituent material of the metal pin 100. The maximum value of the protruding amount is, for example, several times the thickness of the metal plate MP. In this case, the exposure prevention function for the second connection portion 140 can be satisfactorily exhibited without impairing the function of the second connection portion 140. The thickness of the eaves portion 312 along the direction D2 is larger than, but not limited to, the thickness of the partition wall 311 along the stacking direction D1. The length of the eaves portion 312 along the direction D3 is the same as, but not limited to, the length of the partition wall 311 along the direction D3.

As described above, the plurality of first terminal guide portions 301 have the same shape as each other. Therefore, each eaves portion 312 supports each second connecting portion 140 housed in the slot 300 on the same plane (on a plane extending along the stacking direction D1 and the direction D3). Further, in the stacking direction D1, a gap S1 for a part of the case 400 to enter is provided between the eaves portion 312 and the partition wall 311 which is different from the partition wall 311 integrated with the eaves portion 312. By inserting a part of the case 400 (for example, the partition wall 450 described later) into the gap S1, the rattling between the slot 300 and the case 400 along the stacking direction D1 can be reduced. Further, the partition wall 311 and the eaves portion 312 function as guide members for the case 400.

The back plate portion 313 is a portion that regulates the movement of the second connecting portion 140 of the metal pin 100 in the direction D3 and reinforces the partition wall 311 and the eaves portion 312, and is along the direction D2 from the main surface 30a of the external base 30. Stand up. The back plate portion 313 is integrated with one end of the partition wall 311 and one end of the eaves portion 312 in the direction D3, and exhibits insulating properties. The back plate portion 313 is also in contact with the connecting portion 303, like the partition wall 311 and the eaves portion 312. In the stacking direction D1, for example, one end of the back plate portion 313 coincides with the partition wall 311 and the other end of the back plate portion 313 coincides with the eaves portion 312.

Each of the pair of second terminal guide portions 302 is a guide member having the same function as the first terminal guide portion 301, and is provided on the other side (lower side) of the first terminal guide portion 301 in the stacking direction D1, for example. Be done. Each of the second terminal guide portions 302 has a partition wall 321 and an eaves portion 322, and a back plate portion 323. The partition wall 321 and the back plate portion 323 have the same shape as the partition wall 311 and the back plate portion 313 of the first terminal guide portion 301, respectively. On the other hand, each eaves portion 322 is integrated via a coupling portion 324, unlike the eaves portion 312 of the first terminal guide portion 301. The connecting portion 324 is located on the opposite side of the through hole 30b with the back plate portion 323 in the direction D3, and is provided with an opening 324a into which a fixing member such as a bolt can be inserted. Each eaves portion 322 may be provided with a protruding portion in the same manner as the eaves portion 312.

In the stacking direction D1, a gap S2 for a part of the case 400 to enter is provided between the eaves portion 322 and the partition wall 321 which is different from the partition wall 321 integrated with the eaves portion 322. In addition, in the stacking direction D1, a gap S3 similar to the gaps S1 and S2 is provided between the eaves portion 322 and the partition wall 311 of the first terminal guide portion 301 located next to the eaves portion 322. Therefore, the partition wall 321 and the eaves portion 322 also function as guide members for the case 400.

The connection portion 303 is a portion that integrates the first terminal guide portion 301 and the second terminal guide portion 302 and reinforces the first terminal guide portion 301. The connecting portion 303 is opposite to the plate-shaped portion 331 located on the opposite side of the through hole 30b across the back plate portions 313 and 323 in the direction D3 and the first terminal guide portion 301 sandwiching the plate-shaped portion 331 in the direction D3. It has a plurality of reinforcing portions 332 located on the side. The plate-shaped portion 331 is a portion that comes into contact with each of the first terminal guide portions 301 and each of the second terminal guide portions 302. The reinforcing portion 332 is provided to prevent damage to the first terminal guide portion 301 and the plate-shaped portion 331, and has a polygonal shape such as a triangle shape when viewed from the stacking direction D1.

(Case)
FIG. 14 is a perspective view showing the case. As shown in FIG. 14, the case 400 is a structure for accommodating the monitoring board 200, and is configured to be removable from the slot 300. The case 400 has a structure different from that of the external base 30 and the slot 300. By detaching the case 400 from the slot 300, for example, the monitoring board 200 can be easily accommodated in the case 400 and the monitoring board 200 can be easily taken out from the case 400. At least a part of the case 400 is, for example, a molded resin having an insulating property.

The case 400 is defined by the main body 401, the cover 402 mounted on the main body 401 and fixing the monitoring board 200, and the main body 401 and the cover 402, and the opening 403 that exposes the connection terminals 221, 222 of the monitoring board 200. And have. The main body 401 is made of resin, for example, and exhibits insulating properties and elasticity. From the viewpoint of reducing the influence of noise generated outside the power storage device 1 on the monitoring board 200, the cover 402 is made of, for example, metal. The opening 403 is a portion defined by the edge of the main body 401 and the cover 402 in the direction D3, and is located at one end of the case 400 in the direction D3. When the case 400 is mounted in the slot 300, the opening 403 is the portion that is combined with the slot 300 outlet 304 (see FIG. 12). When the case 400 is mounted in the slot 300, the second connection portion 140 of the metal pin 100 and a part of the slot 300 are inserted into the opening 403. That is, the opening 403 also functions as an insertion port for the metal pin 100 and the slot 300. Although not shown, the case 400 is defined by a body 401 and a cover 402 and has another opening that exposes the power terminals of the monitoring board 200. The other opening is, for example, a portion through which wiring or the like for connecting the power supply terminal of the monitoring board 200 and the external device is inserted, and is provided on the opposite side of the opening 403 in the direction D3.

Next, in addition to FIG. 14, the structure of the main body 401 will be described in detail with reference to FIGS. 15 to 17. FIG. 15A is a plan view of the main body, and FIG. 15B is a perspective view of the main body. 16 (a) is an enlarged view of a part of FIG. 15 (b), and FIG. 16 (b) is a bottom view of FIG. 16 (a). FIG. 17 is an enlarged perspective view of a main part of FIG.

As shown in FIGS. 15A and 15B, the main body 401 connects the bottom plate 411, the side walls 421 to 414 standing from the edge 411a of the bottom plate 411, and the side walls 421 and 414, and stands up from the edge 411a. It has a connecting wall 415 to be formed, a reinforcing portion 416 for reinforcing at least the connecting wall 415, and a stepped portion 417 protruding from the bottom plate 411. The side walls 421 and 413 face each other in the stacking direction D1. The side wall 414, the connecting wall 415, and the step portion 417 face each other in the direction D3.

The bottom plate 411 is a flat plate portion that serves as a base for the side walls 421-414, the connecting wall 415, the reinforcing portion 416, and the step portion 417. When the case 400 is mounted in the slot 300, the bottom plate 411 comes into contact with the main surface 30a of the external base 30. In a plan view, the bottom plate 411 has a hexagonal shape formed by missing one apex of a rectangle and its periphery. The missing portion has a substantially rectangular shape in a plan view. The missing vertices correspond to, for example, the intersections when the side walls 421 and 414 are extended. In the present embodiment, when the monitoring board 200 is placed on the case 400, the bottom plate 411 is separated from the monitoring board 200.

The side wall 412 is a portion located on one side (upper side) in the stacking direction D1 when the case 400 is mounted in the slot 300, and extends along the direction D3 in a plan view. In the direction D3, one end side of the side wall 412 is integrated with the step portion 417, and the other end side of the side wall 412 is integrated with the connection wall 415. The side wall 412 has a top surface 412a, an inner peripheral surface 412b, an outer peripheral surface 412c, a concave portion 412d, a convex portion 412e, and an overhanging portion 412f. The inner peripheral surface 412b is in contact with the reinforcing portion 416 and the stepped portion 417. Therefore, it can be said that the side wall 412 is reinforced by the reinforcing portion 416. The recess 412d is recessed from the top surface 412a toward the bottom plate 411 in the direction D2, and is located on the step portion 417 side in the direction D3. Therefore, in the direction D2, the bottom of the recess 412d is located closer to the bottom plate 411 than the top surface 412a. The convex portion 412e protrudes from the outer peripheral surface 412c along the stacking direction D1. The convex portion 412e functions as a hook for the cover 402. In a plan view, the concave portion 412d and the convex portion 412e are aligned in the stacking direction D1, but the present invention is not limited to this. The overhanging portion 412f is a portion that overhangs the first standing portion 431 (details will be described later) of the stepped portion 417 in the direction D3, and is separated from the bottom plate 411. The overhanging portion 412f is provided to protect the protruding portion 440, which will be described later.

The side wall 413 is a portion located on the other side (lower side) in the stacking direction D1 when the case 400 is mounted in the slot 300, and extends along the direction D3 in a plan view. In the direction D3, one end side of the side wall 413 is integrated with the step portion 417, and the other end side of the side wall 413 is integrated with the side wall 414. The dimension of the side wall 413 along the direction D3 is longer than the dimension of the side wall 412 along the direction D3. The side wall 413 has a top surface 413a, an inner peripheral surface 413b, an outer peripheral surface 413c, a first concave portion 413d, a second concave portion 413e, a convex portion 413f, and an overhanging portion 413g. The first recess 413d is recessed from the top surface 413a toward the bottom plate 411 in the direction D2, and is located on the step portion 417 side in the direction D3. The second recess 413e is recessed from the top surface 413a toward the bottom plate 411 like the first recess 413d, and is located on the side wall 414 side in the direction D3. The amount of depression in the second recess 413e is smaller than, but not limited to, the amount of depression in the first recess 413d. The convex portion 413f projects from the outer peripheral surface 413c along the stacking direction D1. The convex portion 413f functions as a hooking portion with respect to the cover 402, similarly to the convex portion 412e. In a plan view, the first concave portion 413d and the convex portion 413f are aligned in the stacking direction D1, but the present invention is not limited to this. The overhanging portion 413g is a portion that overhangs the first standing portion 431 (details will be described later) of the stepped portion 417 in the direction D3, and is separated from the bottom plate 411. The overhanging portion 412f is provided to protect the protruding portion 440, which will be described later.

The side wall 414 is the portion farthest from the slot 300 in the direction D3 when the case 400 is mounted in the slot 300, and extends along the stacking direction D1 in a plan view. In the stacking direction D1, one end side of the side wall 414 is integrated with the connecting wall 415, and the other end side of the side wall 414 is integrated with the side wall 413. The side wall 414 has a top surface 414a, an inner peripheral surface 414b, an outer peripheral surface 414c, a first concave portion 414d, a second concave portion 414e, a first convex portion 414f, and a second convex portion 414g. The first recess 414d is recessed from the top surface 414a toward the bottom plate 411 in the direction D2, and is located on the side wall 413 side in the stacking direction D1. The first recess 414d is connected to the second recess 413e of the side wall 413, and the bottom of the first recess 414d and the bottom of the second recess 413e are located on the same plane. The second recess 414e is a portion that defines the other opening, and is recessed from the top surface 414a toward the bottom plate 411 in the same manner as the first recess 414d. The second recess 414e is located closer to the side wall 412 than the first recess 414d in the stacking direction D1. From the viewpoint of allowing wiring or the like to be satisfactorily inserted into the other opening, the recessed amount of the second recess 414e is larger than the recessed amount of the first recess 414d, and the length of the second recess 414e in the stacking direction D1 is large. , Longer than the length of the first recess 414d in the stacking direction D1. The first convex portion 414f protrudes from the outer peripheral surface 414c along the direction D3, and is located between the first concave portion 414d and the second concave portion 414e in the stacking direction D1. The second convex portion 414g projects from the outer peripheral surface 414c along the direction D3, and is located between the second concave portion 414e and the connecting wall 415 in the stacking direction D1. The first convex portion 414f and the second convex portion 414g function as a hooking portion with respect to the cover 402, similarly to the convex portions 412e and 413f.

In the present embodiment, the top surfaces 412a, 413a, and 414a are located on the same plane as each other, but the present invention is not limited to this. Further, the recess 412d of the side wall 412 and the first recess 413d of the side wall 413 are aligned in the stacking direction D1, and the recess amount of the recess 412d and the recess amount of the first recess 413d are equal to each other, but are limited to this. Absent.

The connecting wall 415 has a first connecting portion 421 extending from the side wall 412 along the stacking direction D1 and a second connecting portion 422 extending from the side wall 414 to the first connecting portion 421 along the direction D3. The top surface 421a of the first connecting portion 421 and the top surface 422a of the second connecting portion 422 are located on the same plane as each other, and are located closer to the bottom plate 411 than the top surface 412a of the side wall 412. In the present embodiment, the top surfaces 421a and 422a are located on the bottom plate 411 side of the recess 412d of the side wall 412 in the direction D2, but are not limited thereto.

The reinforcing portion 416 is a portion extending from the first connecting portion 421 of the connecting wall 415 toward the stepped portion 417 in the direction D3, and protrudes from the bottom plate 411. The reinforcing portion 416 is located between the first connecting portion 421 and the recess 412d of the side wall 412 in the direction D3, but is not limited thereto. The top surface 416a of the reinforcing portion 416 is located on the bottom plate 411 side of the recess 412d of the side wall 412 in the direction D2, and is located on the bottom plate 411 side of the top surface 421a of the first connecting portion 421, but is not limited thereto. .. The reinforcing portion 416 is integrated with the side wall 412 and the connecting wall 415.

The step portion 417 is a portion that can be inserted into or come into contact with the slot 300 when the case 400 is mounted in the slot 300. The step portion 417 is a first standing portion 431 that stands up from the bottom plate 411 along the direction D2, and an extending portion that extends from the tip of the first standing portion 431 toward the opening 403 along the direction D3. It has a 432 and a second erection portion 433 erected from the extension portion 432 along the direction D2. The first erection portion 431 is erected from the edge 411a of the bottom plate 411 and extends in the stacking direction D1 in a plan view. One end of the first standing portion 431 in the stacking direction D1 is integrated with the side wall 412, and the other end of the first standing portion 431 in the stacking direction D1 is integrated with the side wall 413. The extension portion 432 is a flat plate-like portion extending in parallel with the bottom plate 411. The extension portion 432 extends in the stacking direction D1 in a plan view, and is integrated with the overhanging portion 412f of the side wall 412 and the overhanging portion 413g of the side wall 413. In direction D2, the extension portion 432 is located between the top surface 416a of the reinforcing portion 416 and the bottom of the recess 412d of the side wall 412, but is not limited thereto. The second erection portion 433 extends from the outermost portion of the extension portion 432 in the direction D3 toward the cover 402. The second erection portion 433 extends in the stacking direction D1 in a plan view, and is integrated with the overhanging portion 412f of the side wall 412 and the overhanging portion 413g of the side wall 413. The top surface 433a of the second standing portion 433 functions as a mounting portion of the monitoring board 200, and is located between the top surface 421a of the first connecting portion 421 and the bottom of the recess 412d of the side wall 412 in the direction D2. However, it is not limited to this. A plurality of projecting portions 440 and a plurality of partition walls 450 (a plurality of first partition walls) are provided on the outer peripheral surface 433b of the second standing portion 433.

As shown in FIGS. 15 (a) and 15 (b) and 16 (a) and 16 (b), each of the plurality of protrusions 440 is opened from the outer peripheral surface 433b of the second standing portion 433 in the direction D3. It is a part that protrudes toward 403. The plurality of protrusions 440 are arranged side by side in the stacking direction D1. Two adjacent protrusions 440 are separated from each other. As shown in FIG. 17, the protrusion 440 is provided below the connection terminal 222 of the monitoring board 200 in the direction D2, and faces and is separated from the connection terminal 222. Further, when the case 400 is mounted in the slot 300, the plurality of protrusions 440 are inserted into the insertion ports 304 of the slot 300. At this time, the protruding portion 440 functions as a guide for the second connecting portion 140 of the metal pin 100 (details will be described later).

The plurality of protrusions 440 have the same shape as each other. Further, the distance between each protrusion 440 and the connection terminal 222 of the monitoring board 200 along the direction D2 is constant. Each of the plurality of protrusions 440 has side surfaces 441 to 443 extending from the outer peripheral surface 433b to the outside of the case 400 in the direction D3, the tip surface 444 in the direction D3, and the connecting surface 445 connecting the side surface 443 and the tip surface 444. Have.

The side surface 441 is a surface extending from the bottom surface 432a of the extending portion 432 to the opening 403 in the direction D3, and extends along the stacking direction D1 and the direction D3. Therefore, the side surface 441 and the bottom surface 432a are integrated with each other. The side surface 442 is a surface that stands up from the other end (lower end) of the side surface 441 in the stacking direction D1 along the direction D2, and extends along the directions D2 and D3. The side surface 443 is a surface located on the opposite side of the side surface 441 in the direction D2, and extends along the stacking direction D1 and the direction D3. In the direction D2, the side surface 443 is located closer to the bottom plate 411 than the top surface 433a of the second standing portion 433. When the monitoring board 200 is mounted on the main body 401, the side surface 443 becomes a facing surface facing the connection terminal 222 of the monitoring board 200 in the direction D2.

The tip surface 444 is a surface that stands upright from the tip of the side surface 441 along the direction D2 in the direction D3, and extends along the stacking direction D1 and the direction D2. In the region where the tip surface 444 is provided, the amount of protrusion of the protrusion 440 along the direction D3 is constant, but is not limited to this. The connecting surface 445 is a surface extending from the side surface 443 toward the opening 403 in the direction D3, and connects the side surface 443 and the tip surface 444. When the monitoring board 200 is mounted on the main body 401, a part of the connection surface 445 may be a facing surface facing the connection terminal 222 of the monitoring board 200 in the direction D2. In the region where the connecting surface 445 is provided, the amount of protrusion of the protrusion 440 along the direction D3 changes continuously. In this region, the closer to the tip surface 444, the larger the amount of protrusion of the protruding portion 440. In other words, in the case 400, the amount of protrusion of the protrusion 440 along the direction D3 is smaller as it is closer to the cover 402 in the direction D2. In this case, when the case 400 is mounted in the slot 300, the connection surface 445 can satisfactorily exhibit a guide function for guiding the fifth portion 145 included in the second connection portion 140 of the metal pin 100 onto the side surface 443. (Details will be described later). The connecting surface 445 is a curved surface that exhibits an arc shape when viewed from the stacking direction D1, but is not limited to this. The connecting surface 445 may be an inclined surface.

Each of the plurality of partition walls 450 is a portion for partitioning the opening 403, and is erected from the outer peripheral surface 433b of the second standing portion 433 toward the opening 403 in the direction D3, similarly to the protruding portion 440. The plurality of partition walls 450 are arranged in the stacking direction D1 and are arranged between adjacent protrusions 440. That is, the partition wall 450 has a function of partitioning adjacent protrusions 440 from each other. The two adjacent partition walls 450 are separated from each other, and the protrusions 440 and the partition walls 450 are alternately arranged in the stacking direction D1. Each of the plurality of partition walls 450 is integrated with the corresponding protrusion 440. By integrating the projecting portion 440 and the partition wall 450, the strength of the projecting portion 440 and the partition wall 450 is improved.

When the monitoring board 200 is mounted on the main body 401, the corresponding partition wall 450 among the plurality of partition walls 450 is arranged between the adjacent connection terminals 221 in the plurality of connection terminals 221 of the monitoring board 200. At this time, each of the plurality of partition walls 450 is arranged in the space S formed by the recess 230 provided in the monitoring board 200, and the connection terminals 221 and the partition wall 450 are alternately arranged in the stacking direction D1. ..

Each of the plurality of partition walls 450 has side surfaces 451-454 extending outward from the outer peripheral surface 433b and the case 400 in direction D3, and a front end surface 455. The side surface 451 is a surface extending from the bottom surface 432a of the extending portion 432 to the opening 403 in the direction D3, and extends along the stacking direction D1 and the direction D3. Therefore, the side surface 451 and the bottom surface 432a are integrated with each other and are located on the same plane. In addition, the side surface 451 is also integrated with the side surface 441 of the protrusion 440. The side surface 452 is a surface that stands upright along the direction D2 from the other end (lower end) of the side surface 451 in the stacking direction D1, and extends along the directions D2 and D3. A part of the side surface 452 is integrated with the protrusion 440, and the other part of the side surface 452 extends toward the cover 402 side in the direction D2 from the protrusion 440. The side surface 453 is a surface located on the opposite side of the side surface 452 in the stacking direction D1, and extends along the directions D2 and D3. The sides 452 and 453 have the same shape as each other.

The side surface 453 is separated from another protrusion 440, which is different from the protrusion 440 integrated with the side surface 452. Therefore, a gap S11 is provided between the side surface 453 and another protrusion 440 for a part of the slot 300 to enter. For example, when the case 400 is mounted in the slot 300, the partition wall 311 of the slot 300 enters the gap S11. In the case 400, a gap S12 is provided between the protrusion 440 and the side wall 413 for a part of the slot 300 to enter, similarly to the gap S11.

The side surface 454 is a surface located on the opposite side of the side surface 451 in the direction D2, and extends along the stacking direction D1 and the direction D3. As shown in FIG. 17, the side surface 454 is in contact with the cover 402 from the viewpoint of partitioning the opening 403 without a gap. Therefore, in the direction D2, the side surface 454 is located closer to the cover 402 than the top surface 433a of the second standing portion 433, the side surface 443 of the protruding portion 440, and the like. In the direction D2, the side surface 454 and the top surfaces 412a to 414a of the side walls 421-414 are located on the same plane, but the present invention is not limited to this.

The tip surface 455 is a surface that stands upright along the direction D2 from the tip of the side surface 451 in the direction D3, and extends along the stacking direction D1 and the direction D2. The tip surface 455 is located closer to the opening 403 in the direction D3 than the protrusion 440. That is, the partition wall 450 projects toward the opening 403 side with respect to the projecting portion 440 in the direction D2. The corner portion 456 formed by the front end surface 455 and the side surface 454 has a rounded shape, but is not limited thereto.

Next, in addition to FIG. 17, the structure of the cover 402 will be described in detail with reference to FIGS. 18A and 18B. FIG. 18A is a perspective view of the cover, and FIG. 18B is a plan view of the cover.

As shown in FIGS. 18A and 18B, the cover 402 protrudes from the top plate 461, the side walls 462 to 464 erected from the edge 461a of the top plate 461, and the top plate 461 along the direction D3. It has a protruding portion 465 to be formed. The side wall 462 is a portion located on one side (upper side) in the stacking direction D1 when the case 400 is mounted in the slot 300, and extends along the direction D3 in a plan view. The side wall 463 is a portion located on the other side (lower side) in the stacking direction D1 when the case 400 is mounted in the slot 300, and extends along the direction D3 in a plan view. The side walls 462 and 463 face each other in the stacking direction D1. The side wall 464 is a portion located on the opposite side of the protruding portion 465 with the top plate 461 in the direction D3, and extends along the stacking direction D1 in a plan view.

The top plate 461 is a member that functions as a base for the side walls 462 to 464 and the protrusion 465 and covers the monitoring board 200 mounted on the main body 401. The top plate 461 has a substantially rectangular shape in a plan view. When the cover 402 is attached to the main body 401, the side wall 462 covers at least a part of the outer peripheral surface 412c of the side wall 412 of the main body 401, the side wall 463 covers at least a part of the outer peripheral surface 413c of the side wall 413, and the side wall 464 is the side wall. It covers at least a part of the outer peripheral surface 414c of the 414. The side walls 462 and 463 are provided with openings 462a and 463a, respectively. When the cover 402 is attached to the main body 401, the convex portion 412e enters the opening 462a, and the convex portion 413f enters the opening 463a (see FIG. 14). This makes it difficult for the cover 402 to come off from the main body 401. The side wall 414 is provided with openings corresponding to the first convex portion 414f and the second convex portion 414g (not shown).

The protruding portion 465 is a portion that protrudes toward the opening 403 along the direction D3 and is integrated with the top plate 461. The protrusion 465 is provided with an opening 465a. When the case 400 is mounted in the slot 300, the opening 465a is provided at a position overlapping the opening 324a (see FIG. 12A) of the slot 300. For example, by using a fixing member that inserts the opening 465a and the opening 324a, it is possible to prevent the case 400 from being detached from the slot 300.

The cover 402 is provided with recessed portions 471 to 474 that are recessed toward the main body 401 in the direction D2 and support the monitoring substrate 200. The depressed portion 471 is one end in the stacking direction D1 and is provided on the protruding portion 465 side in the direction D3. The recessed portion 472 is one end in the stacking direction D1 and is provided on the side wall 464 side in the direction D3. The depressed portion 473 is the other end in the stacking direction D1 and is provided on the protruding portion 465 side in the direction D3. The recessed portion 474 is the other end in the stacking direction D1 and is provided on the side wall 464 side in the direction D3. In a plan view, the recessed portions 471 and 472 extend from the side wall 462 along the stacking direction D1, the depressed portions 473 and 474 extend from the side wall 463 along the stacking direction D1, and the depressed portions 471 and 473 are laminated. The recessed portions 472 and 474 are lined up in the direction D1 and are lined up in the stacking direction D1. When the cover 402 is attached to the main body 401, a part of the recessed portion 471 is housed in the recess 412d of the side wall 412, a part of the recessed portion 472 is placed on the connecting wall 415, and a part of the recessed portion 473 is mounted. It is housed in the first recess 413d of the side wall 413, and a part of the recessed portion 474 is placed on the second recess 413e of the side wall 413 and the first recess 414d of the side wall 414.

The recessed portions 471, 472, and 474 are provided with openings 471a, 472a, and 474a along the direction D2, respectively. When the monitoring board 200 is housed in the case 400, the openings 471a and 474a overlap the through holes 210a of the corresponding monitoring board 200, respectively. For example, by using a fixing member that inserts the opening 471a and one through hole 210a and a fixing member that inserts the opening 474a and the other through hole 210a, the position of the monitoring substrate 200 housed in the case 400 can be determined. Can be fixed well. The monitoring board 200 can maintain a good position with respect to the slot 300 by being fixed and supported in the recessed portions 471, 473, 474 via the fixing member. When the case 400 is mounted in the slot 300, the opening 472a overlaps an opening (not shown) provided in the external base 30. For example, by using a fixing member that inserts the opening 472a and the opening, the case 400 mounted in the slot 300 can be fixed on the external base 30.

Next, the operation of the metal pin 100 when the case 400 is mounted in the slot 300 will be described with reference to FIGS. 19 (a) to 19 (c) and FIG. 20. 19 (a) to 19 (c) are diagrams for explaining the operation of the metal pin when the case is mounted in the slot. FIG. 20 is a schematic enlarged view showing a state in which the case is mounted in the slot. In FIG. 20, the cover 402 of the case 400 is omitted.

As shown in FIG. 19A, when the case 400 is mounted in the slot 300, the second connection portion 140 of the metal pin 100 housed in the slot 300 and the connection terminal of the monitoring board 200 housed in the case 400. The case 400 is moved toward the slot 300 along the direction D3 in a state where the 221 and 222 face each other in the direction D3. As a result, as shown in FIG. 19B, the fifth portion 145 included in the second connecting portion 140 of the metal pin 100 comes into contact with the protruding portion 440 of the case 400. Specifically, the fifth portion 145 abuts on the connecting surface 445 of the protrusion 440. As described above, the amount of protrusion of the protruding portion 440 in the direction D3 is smaller as it is closer to the cover 402 in the direction D2, and the connecting surface 445 is a curved surface. The fifth portion 145 in contact with the connection surface 445 is guided to the monitoring board 200 side located above the protrusion 440 as the case 400 moves toward the slot 300 side. Further, the bent portion 141a and the second portion 142, which are the biasing portions in the second connecting portion 140, are located between the connecting terminal 221 and the eaves portion 312 and are pressed against the connecting terminal 221. Further, the movement of the bent portion 141a and the second portion 142 is regulated by the eaves portion 312. At this time, the bent portion 141a and the second portion 142 are compressed by the connection terminal 221 and the eaves portion 312 of the slot 300. Therefore, the bent portion 141a and the second portion 142 urge the third portion 143 toward the connection terminal 221. That is, the contact surface 143a of the third portion 143 is pressed against the connection terminal 221. As a result, the contact pressure between the contact surface 143a and the connection terminal 221 is ensured, so that the metal pin 100 and the monitoring substrate 200 are satisfactorily conducted.

Then, as shown in FIG. 19C, when the case 400 is mounted in the slot 300, the second connection portion 140 of the metal pin 100 has the eaves portion 312 of the slot 300 and the protrusion of the case 400 in the direction D2. It is sandwiched between the portion 440 or between the eaves portion 322 and the protruding portion 440. Further, the fifth portion 145 of the second connection portion 140 is located between the connection terminal 222 of the monitoring board 200 and the side surface 443 which is the opposite surface to the connection terminal 222, and the connection terminal 222 and the side surface 443 are connected to each other. Contact both. In the present embodiment, the fifth portion 145 and the connection terminal 222, and the fifth portion 145 and the side surface 443 are in close contact with each other without any gap. Therefore, the contact pressure between the contact surface 145a of the fifth portion 145 and the connection terminal 222 is secured.

As shown in FIG. 20, when the case 400 is mounted in the slot 300, the second connection portion 140 of the metal pin 100 is laminated between the partition wall 311 of the slot 300 and the side wall 412 of the case 400 in the stacking direction D1. Between the partition wall 311 and the partition wall 450 of the case 400 in the direction D1, between the partition wall 321 of the slot 300 and the partition wall 450 of the case 400 in the stacking direction D1, or between the partition wall 321 of the slot 300 and the side wall of the case 400 in the stacking direction D1. It is located between 413 (see also FIG. 12 (a) and FIG. 15 (a)). Each of the plurality of partition walls 311, 321 provided in the slot 300 is inserted into, for example, the gap S11 or the gap S12 (see FIG. 15A) provided in the case 400. On the other hand, the partition wall 450 is inserted into any of the gaps S1 to S3 (see FIG. 12A) provided in the slot 300, for example. Therefore, the second connection portion 140 is sandwiched between the partition wall 311 and the side wall 412, the partition wall 311, 450, the partition wall 321, 450, or the partition wall 321 and the side wall 413 in the stacking direction D1. As described above, the second connecting portion 140 is sandwiched between the eaves portion 312 of the slot 300 and the protruding portion 440 of the case 400, or the eaves portion 322 and the protruding portion 440 in the direction D2. In addition, the second connecting portion 140 is sandwiched between the back plate portion 313 or the back plate portion 323 and the protruding portion 312a in the direction D3. Therefore, when the case 400 is mounted in the slot 300, the movement of each of the second connecting portions 140 is restricted in both the stacking directions D1 and the directions D2 and D3.

When the case 400 is mounted in the slot 300, the distance between each eaves 312 along the direction D2 and the corresponding connection terminal 221 and each protrusion 440 along the direction D2 and the corresponding connection terminal 222 is constant. Is. Therefore, in the plurality of metal pins 100, each second connection portion 140 is supported on the same plane by the monitoring board 200, the slot 300, and the case 400.

(Effect of power storage device)
According to the power storage device 1 according to the present embodiment described above, the first conductive plate 5A and the monitoring board 200 are electrically connected by the first metal pins included in the plurality of metal pins 100. Therefore, the first conductive plate 5A and the monitoring board 200 can be electrically connected to each other without using a wire harness and a connector, so that the power storage device 1 can be miniaturized. In addition, the second connection portion 140, which is the second terminal of the first metal pin, comes into surface contact with the pair of connection terminals 221,222 (hereinafter, simply referred to as “first connection terminal”) included in the monitoring board 200. Therefore, it is easy to establish continuity between the second connection portion 140 and the first connection terminal, and it is possible to suppress the separation of the second connection portion 140 and the first connection terminal due to vibration or the like. Further, since the second connecting portion 140 is supported by the slot 300 (particularly, the eaves portion 312), the misalignment of the second connecting portion 140 due to vibration or the like can be suppressed. Therefore, since the continuity between the first conductive plate 5A and the monitoring board 200 via the first metal pin can be maintained satisfactorily, the monitoring accuracy of the power storage module 4 by the monitoring board 200 can also be improved.

In addition, since it is not necessary to use the wire harness and the connector in this embodiment, the number of parts of the power storage device 1 and the number of steps required for assembling the power storage device 1 can be reduced. Therefore, the cost of the power storage device 1 can be reduced.

In the present embodiment, the second connection portion 140 is composed of a bent portion 141a and a second portion 142, is located between the first connection terminal and the eaves portion 312 of the slot 300, and has a contact surface 143a as described above. It has an urging portion that urges the first connection terminal. Therefore, since the urging portion of the second connecting portion 140 presses the contact surface 143a against the first connecting terminal, the separation between the first connecting terminal and the contact surface 143a due to vibration or the like can be satisfactorily suppressed.

In the present embodiment, the power storage device 1 is separate from the second conductive plate located on the opposite side of the first conductive plate 5A via the power storage module 4 in the stacking direction D1 and the first metal pin extending in the direction D2. The second metal pin is further provided with a first connection portion 110 (third terminal) fixed to the second conductive plate, and a connection terminal of a monitoring board 200 different from the first connection terminal. It has a second connection portion 140 (fourth terminal) that comes into surface contact with the 221,222 (second connection terminal), and the slot 300 has a second connection portion 140 of the first metal pin and a second metal pin second. The connection portion 140 is supported on the same plane. Therefore, since the plurality of metal pins 100 can be supported by the slot 300 which is a single structure, it is possible to satisfactorily suppress the increase in size of the power storage device 1, and the metal pins 100 and the monitoring substrate 200 can be easily connected to each other. it can.

In the present embodiment, the power storage device 1 further includes an external base 30 that is separated from the power storage modules 4A and 4B in the direction D2 and in which the monitoring board 200 and the slot 300 are arranged. Therefore, when the first metal pin and the monitoring board 200 are electrically connected, for example, it is possible to prevent the power storage modules 4A and 4B from interfering with each other.

(Effect of metal pin)
The metal pin 100 described above has a first extending portion 120 and a second extending portion 130 extending along the Y-axis direction. Then, the stress generated in the metal pin 100 in the Z-axis direction can be absorbed by the first extending portion 120 whose width in the X-axis direction is larger than the width in the Z-axis direction. Further, the second extending portion 130 whose width in the Z-axis direction is larger than the width in the X-axis direction can absorb the stress generated in the metal pin 100 in the X-axis direction. Therefore, according to the metal pin 100, the stress generated by the bending deformation in the X-axis direction or the Z-axis direction can be appropriately absorbed. As a result, damage to the metal pin 100 can be suppressed.

Further, the first extending portion 120 has a bent portion 121 that bends in the Z-axis direction. The bent portion 121 makes it possible to absorb stress in the Y-axis direction. Specifically, when a force that pulls or contracts the metal pin 100 in the Y-axis direction acts, the bent portion 121 can expand and contract within a certain range, so that the stress generated in the metal pin 100 in the Y-axis direction Can be absorbed to some extent. Therefore, according to the bent portion 121, damage to the metal pin 100 can be suitably suppressed.

Further, the second extending portion 130 has a bent portion 131 that bends in the X-axis direction. The bent portion 131 makes it possible to absorb stress in the Y-axis direction. Specifically, similarly to the bent portion 121 described above, when a force that pulls or contracts the metal pin 100 in the Y-axis direction acts, the bent portion 131 can expand and contract within a certain range, so that the metal The stress generated in the pin 100 in the Y-axis direction can be absorbed to some extent. Therefore, according to the bent portion 131, damage to the metal pin 100 can be suitably suppressed. In addition, in order to absorb the stress in the Y-axis direction, both the bent portion 121 and the bent portion 131 may be provided as in the present embodiment, or only one of the bent portion 121 and the bent portion 131 is provided. May be done.

Further, the first extending portion 120 and the second extending portion 130 are integrally formed by a common plate-shaped member (in this embodiment, the metal plate MP shown in FIG. 6). The metal pin 100 having the first extending portion 120 and the second extending portion 130 can be easily manufactured by processing (bending or the like) on the originally flat metal plate MP.

Further, the first extending portion 120 and the second extending portion 130 have a region A that overlaps with each other along the Y-axis direction within the width of the first extending portion 120 in the X-axis direction. By providing the region A in which the first extending portion 120 and the second extending portion 130 overlap, a rectangular metal plate can be used, so that the manufacturing cost of the metal pin 100 can be reduced.

Further, a recess 132 is provided at the end 130a of the second extending portion 130 in the Z-axis direction. In this case, the cross-sectional area of the portion of the second extending portion 130 where the recess 132 is provided can be made smaller than the cross-sectional area of the portion where the recess 132 is not provided. By providing the portion having a small cross-sectional area by the recess 132 in this way, the stress generated in the metal pin 100 due to the bending (twisting) deformation in the Y-axis direction can be suitably absorbed.

The first member and the second member connected by the metal pin 100 are the conductive plate 5 and the monitoring board 200. In this case, each conductive plate 5 and each connection terminal (each set of connection terminals 221,222) provided on the monitoring board 200 are electrically connected via each metal pin 100. Here, the width of the first extending portion 120 in the Z-axis direction (that is, the stacking direction D1) is smaller than the width of the first extending portion 120 in the X-axis direction, so that the metal pin 100 is first extended. The unit 120 and the first connection unit 110 can be easily inserted between the adjacent power storage modules 4.

Further, the second connecting portion 140 has contact surfaces 143a and 145a along the Z-axis direction. In this case, the contact surfaces 143a and 145a of the second connection portions 140 of the plurality of metal pins 100 arranged in the Z-axis direction corresponding to the plurality of conductive plates 5 laminated in the Z-axis direction (stacking direction D1) are formed. It is possible to position them on the same plane along the Z-axis direction. As a result, a single circuit board provided with a plurality of connection terminals (a plurality of sets of connection terminals 221, 222) for conducting (contacting) the contact surfaces 143a and 145a of the second connection portion 140 of each metal pin 100 can be used. The monitoring board 200 can be configured. That is, in a configuration that does not use a wire harness and a connector, it is possible to realize a configuration in which the voltages of a plurality of power storage modules 4 can be monitored by a single circuit board.

Further, the second connection portion 140 has an urging portion that urges the contact surfaces 143a and 145a toward the connection terminals 221,222 of the monitoring board 200. As described above, in the present embodiment, the third portion 143 and the fifth portion 145 function as an urging unit. In this case, since the contact surfaces 143a and 145a are pressed against the connection terminals 221 and 222 of the monitoring board 200 by the urging portion, the contact surfaces 143a and 145a of the second connection portion 140 of the metal pin 100 and the connection terminal 221 of the monitoring board 200. , 222 can be suitably secured.

Further, the second connecting portion 140 has a pair of contact surfaces 143a and 145a facing each other. In this case, by sandwiching the monitoring board 200 provided with the connection terminals 221 and 222 on both sides between the pair of contact surfaces 143a and 145a, the contact surfaces 143a and 145a of the second connection portion 140 of the metal pin 100 and the monitoring board 200 It is possible to more reliably ensure continuity with the connection terminals 221,222.

Further, the second connecting portion 140 extends along the X-axis direction from the end portion of the second extending portion 130 opposite to the first extending portion 120. Further, the contact surfaces 143a and 145a are surfaces perpendicular to the Y-axis direction (that is, surfaces parallel to the XZ plane). In this case, the monitoring board 200 can be arranged along a plane (XZ plane) perpendicular to the Y-axis direction. That is, as shown in FIGS. 1 and 2, the monitoring substrate 200 can be arranged on the side surface of the module laminate 2 so as to be parallel to the stacking direction D1 and the direction D3. Thereby, the dimension of the power storage device 1 in the Y-axis direction (that is, the direction D2) can be reduced.

Further, the metal pin 100 includes a corner portion 150. The corners 150 allow the metal pin 100 to be appropriately fixed to the eaves 312 of the slot 300 (in this embodiment, the metal pin 100 can be appropriately fixed to the metal pin 100 due to vibration or the like. Separation from the monitoring substrate 200 can be suitably suppressed.

Further, a concave-convex shape portion 133 is provided at the end portion 130a of the second extending portion 130 in the Z-axis direction. According to the above configuration, when the electrolytic solution leaks from the power storage module 4 by aligning the Z-axis direction with the vertical direction (gravity direction) and arranging the end portion 130a provided with the concave-convex shape portion 133 downward. In addition, the electrolytic solution can be easily dropped by the uneven shape portion 133 in the second extending portion 130. As a result, it is possible to suppress the transmission of the electrolytic solution to the monitoring substrate 200, and it is possible to suppress the occurrence of tracking and corrosion of the monitoring substrate 200.

(Effect of monitoring board)
In the monitoring board 200 described above, both ends of each power storage module 4 (that is, conductive plates 5 arranged on both sides of the power storage module 4) are electrically connected to a pair of adjacent connection terminals 221 via metal pins 100. By connecting to, the voltage of each power storage module 4 can be measured by the measurement circuit 240. Further, since the recess 230 forming the space S penetrating in the thickness direction is provided between the adjacent connection terminals 221, a short circuit between the adjacent connection terminals 221 can be suppressed. In particular, in the usage mode of the present embodiment, the potential difference between the adjacent connection terminals 221 corresponds to the terminal voltage of four power storage modules and is relatively large. Therefore, separating the adjacent connection terminals 221 by the recess 230 is extremely effective in preventing the occurrence of a defect due to a short circuit. The same can be said for the adjacent connection terminals 222.

Further, as shown in FIG. 11, when viewed from the thickness direction, the end portion 221b of the connection terminal 221 is located outside the bottom portion 230b of the recess 230 (L2> L1). As a result, the total surface distance between the adjacent connection terminals 221 can be made longer than when the recess 230 is not provided. Specifically, when the recess 230 is not provided (that is, when the main surface 211 is formed between the adjacent connection terminals 221), the total surface distance between the adjacent connection terminals 221 is the adjacent side. The distance W between the end portions 230a is set. On the other hand, when the recess 230 is provided as in the present embodiment, the total surface distance between the adjacent connection terminals 221 is “W + 2 × (L2-L1)”. Therefore, according to the present embodiment, the creepage distance can be increased by "2 x (L2-L1)" as compared with the case where the recess 230 is not provided. Then, by increasing the creepage distance, a short circuit between adjacent connection terminals 221 can be effectively suppressed. The same can be said for the adjacent connection terminals 222.

Further, the connection terminal is also exposed on the surface (main surface 212) opposite to the main surface 211. That is, in the present embodiment, the connection terminal 222 exposed on the main surface 212 is provided on the side opposite to the connection terminal 221 (see FIG. 10). In order to establish continuity with the metal pin 100, the monitoring board 200 may include at least one of the connection terminals 221,222. On the other hand, when the monitoring board 200 includes both connection terminals 221,222 as in the present embodiment, it is possible to achieve continuity with the connection terminals 221,222 on both sides of the board portion 210 in the thickness direction. It will be possible. As a result, by using the metal pin 100 configured to sandwich the connection terminals 221,222 from the main surface 211 side and the main surface 212 side, the conduction between the metal pin 100 and the connection terminals 221,222 is more reliable. It becomes possible to plan.

Further, the monitoring board 200 (board portion 210) may be, for example, a printed circuit board in which a conductor pattern is provided on the main surfaces 211 and 212. Further, each connection terminal 221,222 may be formed by the above conductor pattern. In this case, since the connection terminals 221, 222 can be formed inexpensively by the printed wiring, the manufacturing cost of the monitoring board 200 can be reduced.

Further, in the present embodiment, the monitoring board module (circuit board module) is configured by the above-mentioned monitoring board 200 and the case 400 accommodating the monitoring board 200. Then, the case 400 has an insulating partition wall 450 arranged in the space S formed by the recess 230 (see FIG. 11). According to such a circuit board module, since the adjacent connection terminals 221,222 are spatially separated by the partition wall 450, a short circuit between the adjacent connection terminals 221,222 can be suppressed more effectively. .. Further, when viewed from the thickness direction, the end portion 221b of the connection terminal 221 is located outside the end portion of the partition wall 450 arranged in the space S formed by the recess 230 on the monitoring board 200 side (FIG. FIG. 11). In this case, since the adjacent connection terminals 221 are completely shielded from each other by the partition wall 450, a short circuit between the adjacent connection terminals 221 can be suppressed more effectively.

(Case action effect)
According to the case 400 included in the power storage device 1 described above, the protrusion 440 included in the main body 401 has a side surface 443 and a side surface 443 facing the connection terminal 222 when the monitoring board 200 is placed on the main body 401. It has a connecting surface 445, which is a curved surface extending from the opening 403 to the opening 403. When the second connection portion 140, which is an external terminal of the metal pin 100, is inserted into the opening 403 of the case 400 in which the monitoring board 200 is housed, the fifth portion 145 of the second connection portion 140 is the connection surface of the protrusion 440. Upon contact with the 445, the fifth portion 145 is guided to a side surface 443 that connects to the connecting surface 445. This makes it easier for the fifth portion 145 to come into contact with the connection terminal 222 of the monitoring board 200. In this way, the protruding portion 440 of the main body 401 functions as a guide for the second connecting portion 140 (particularly, the fifth portion 145) of the metal pin 100, so that the power storage module 4 and the monitoring board 200 can be easily electrically connected. Will be possible.

In the present embodiment, the amount of protrusion of the protruding portion 440 is smaller as it is closer to the cover 402 in the stacking direction D1 where the main body 401 and the cover 402 overlap. Therefore, the protruding portion 440 of the main body 401 functions well as a guide for the metal pin 100.

In the present embodiment, a composite including a case 400 and a slot 300 which is a second case accommodating a second connecting portion 140 of a metal pin 100 and having an insertion port 304 into which an opening 403 and a protruding portion 440 are inserted. Case 40 is used. By using such a composite case 40, the second connection portion 140 of the metal pin 100 and the connection terminals 221, 222 of the monitoring board 200 can be satisfactorily protected.

In the present embodiment, the slot 300, which is the second case, has a partition wall 311 that accommodates a plurality of second connecting portions 140 and partitions adjacent second connecting portions 140 from each other. Therefore, when the opening 403 and the protrusion 440 are inserted into the insertion port 304, it is possible to prevent, for example, a plurality of second connection portions 140 from being connected to one connection terminal 221 or one connection terminal 222.

In the present embodiment, the slot 300 has an eaves portion 312 that serves as a support portion that supports the second connection portion 140. Therefore, for example, when the opening 403 and the protrusion 440 are inserted into the insertion port 304, it is possible to prevent the metal pin 100 from coming off from the set position.

In addition, according to the case 400, the main body 401 has a plurality of partition walls 450 that partition the opening 403 and exhibit insulating properties, and when the monitoring board 200 is placed on the main body 401, a plurality of connection terminals. Among the plurality of partition walls 450, the corresponding partition wall 450 is arranged between the adjacent connection terminals 221 in the 221. As a result, the adjacent connection terminals 221 are located in different sections in the opening 403 due to the presence of the partition wall 450. Therefore, it is possible to prevent the occurrence of a tracking phenomenon between adjacent connection terminals 221s. In addition, adjacent connection terminals 222 are also located in different compartments in the opening 403 due to the presence of the partition 450. Therefore, it is possible to prevent the occurrence of a tracking phenomenon between adjacent connection terminals 222.

In the present embodiment, the monitoring board 200 has a recess 230 which is provided between adjacent connection terminals 221 and forms a space S penetrating in a direction D2 which is a direction perpendicular to the main surface 211 of the monitoring board 200. The partition wall 450 is arranged in the space S when the monitoring board 200 is placed on the main body 401. Therefore, since the recess 230 is provided between the adjacent connection terminals 221s, the tracking phenomenon caused by the moisture or the like adhering to the surface of the monitoring board 200 is less likely to occur. In addition, since the partition wall 450 is located in the space S, the function of preventing the occurrence of the tracking phenomenon by the partition wall 450 can be satisfactorily exhibited.

In this embodiment, the plurality of partition walls 450 come into contact with the cover 402 when they are provided on the main body 401. Therefore, since the partition wall 450 is supported by the cover 402, the impact resistance of the partition wall 450 can be improved.

In the present embodiment, the case 400, the second connection portion 140 which is an external terminal of the plurality of metal pins 100 connecting the electrode laminate 11 and the monitoring substrate 200 are accommodated, and the opening 403 and the plurality of partition walls 450 are inserted. A composite case 40 including a slot 300, which is a second case having an outlet 304, is used. By using such a composite case 40, the second connection portion 140 of the metal pin 100 and the connection terminals 221, 222 of the monitoring board 200 can be satisfactorily protected.

In the present embodiment, the slot 300 has a plurality of partition walls 311 that partition the insertion port 304 and exhibit insulation, and when the slot 300 accommodates the second connection portion 140 of the plurality of metal pins 100, a plurality of partition walls 300 are provided. The corresponding partition wall 311 among the plurality of partition walls 311 is arranged between the second connecting portions 140 adjacent to each other in the metal pin 100. Therefore, the position of the second connection portion 140 housed in the insertion port 304 can be limited by the partition wall 311. Therefore, when the slot 300 and the case 400 are connected, it is possible to prevent the plurality of second connection portions 140 from coming into contact with one connection terminal 221,222 on the monitoring board 200.

Hereinafter, each modification of the above embodiment will be described. In the following modification, the description of the portion overlapping with the above embodiment will be omitted. Therefore, in the following, the parts different from the above-described embodiment will be mainly described.

(Modification example of power storage device)
FIG. 21 is a schematic perspective view showing a part of the power storage device according to the first modification. As shown in FIG. 21, a structure 600 projecting along the direction D2 is provided on the surface of the sealing body 12A of each power storage module 4C included in the power storage device 1A. In the first modification, the structure 600 is provided on the side surface 4a along the stacking direction D1 and the direction D3 in the power storage module 4C. Each structure 600 is a support portion that supports the second connection portion 140 of the corresponding metal pin 100 (metal pin 100 is not shown). The structures 600 overlap each other in the stacking direction D1 and have the same shape as each other. The structure 600 is a resin portion formed at the same time as the corresponding sealing body 12A, and has a substantially U-shape in a plan view. Each structure 600 is an alternative to the slot 300 of the power storage device 1 in the above embodiment. Therefore, although not shown, when the monitoring board 200 is connected to the metal pin 100, each structure 600 is housed in a case that houses the monitoring board 200.

The structure 600 extends in parallel with the base portion 601 provided on the surface (that is, the side surface 4a) of the sealing body 12A, the protruding portion 602 protruding from one end of the base portion 601 and the tip portion 602 of the protruding portion 602. It is provided with an overhanging portion 603. Each of the base portion 601 and the overhanging portion 603 extends along the direction D3, while the protruding portion 602 extends along the direction D2. The overhanging portion 603 has the same function as the eaves portion 312 of the slot 300 shown in the above embodiment. Although not shown, the second connecting portion 140 of the metal pin is accommodated in the space O defined by the base portion 601 and the protruding portion 602 and the overhanging portion 603. The structure 600 does not have to have the base portion 601.

FIG. 22 is a schematic plan view showing the relationship between the power storage module and the monitoring board according to the first modification. As shown in FIG. 22, when the power storage module 4C is electrically connected to the monitoring board 200, the monitoring board 200 is inserted toward the space O defined by the structure 600. At this time, the monitoring board 200 extends in the extending direction of the side surface 4a of the power storage module 4C.

Also in the power storage device 1A according to the first modification described above, the conductive plate (not shown) and the monitoring board 200 can be electrically connected to each other by using the metal pin 100 without using a wire harness and a connector. .. Therefore, even in the first modification, the same action and effect as those in the above embodiment are exhibited. Further, the power storage device 1A does not have the external base 30 and the slot 300 shown in FIG. 1 and the like. In addition, in the first modification, when the power storage module 4C is electrically connected to the monitoring board 200, the monitoring board 200 extends in the extending direction of the side surface 4a of the power storage module 4C. Therefore, as compared with the above-described embodiment, the effect of being able to satisfactorily suppress the increase in size of the power storage device 1A is exhibited. Further, in the first modification, the shape of the case accommodating the monitoring substrate 200 is appropriately changed according to the shape of the structure 600. Therefore, since the shape of the case can be simplified, the manufacturing cost of the power storage device 1A can be reduced.

FIG. 23 is a schematic perspective view showing a part of the power storage device according to the second modification. As shown in FIG. 23, the power storage device 1B supports the connection member 35 mounted on the end plate 8, the second connection portion 140 of the metal pin 100, and the external base 36 on which the case 400 is arranged, and the connection. It has connecting members 37A and 37B that connect the member 35 and the external base 36. The connecting member 35 is a plate-shaped member extending along the stacking direction D1. One end of the connecting member 35 is fixed to one end plate 8, and the other end of the connecting member 35 is fixed to the other end plate 8. The connecting member 35 extends in parallel with the side surface 4a extending along the stacking direction D1 and the direction D3 in the power storage module 4D. The metal pin 100 according to the second modification is the same as the metal pin 100 of the above embodiment except that it has one more bent portion.

The outer base 36 is a plate-shaped member having a main surface 36a extending in a direction intersecting the side surface 4a. In the second modification, the external base 36 is orthogonal to the side surface 4a. The external base 36 has a plurality of openings 38 and a plurality of support portions 39 provided corresponding to the respective openings 38. The opening 38 is provided for the second connection portion 140 of the corresponding metal pin 100 to pass through. The support portion 39 is provided to support and protect the corresponding second connection portion 140. Further, by providing the support portion 39, it is possible to prevent the adjacent second connection portions 140 from coming into contact with each other. In addition, when the monitoring substrate (not shown) housed in the case 400 is connected to the metal pin 100, the support 39 supports at least one of the metal pin 100 and the case 400. In this case, the case 400 is connected to the monitoring board and the metal pin 100 by moving to the support portion 39 side along the direction D2. Therefore, in the second modification, unlike the first modification, the monitoring substrate intersects or is orthogonal to the side surface 4a like the external base 36.

The support portion 39 has a partition wall 39a that stands up from the main surface 36a of the outer base 36, and an eaves portion 39b that extends from the tip of the partition wall 39a along the stacking direction D1. From the viewpoint of improving the durability of the eaves portion 39b, the partition wall 39a has an L-shape when viewed from the direction D3, but the partition wall 39a is not limited to this. The eaves portion 39b extends along the stacking direction D1 so as to overlap the corresponding opening 38 in the direction D3. The support portion 39 also functions as a guide member for the case 400. Therefore, when the monitoring board housed in the case 400 is connected to the metal pin 100, the monitoring board is guided to the support portion 39 and inserted.

The connecting members 37A and 37B are members having an L shape when viewed from the stacking direction D1. The connecting member 37A is located on one end plate 8 side in the stacking direction D1, and the connecting member 37B is located on the other end plate 8 side in the stacking direction D1.

Also in the power storage device 1B according to the second modification described above, the conductive plate (not shown) and the monitoring board (not shown) included in the case 400 use the metal pin 100 without using the wire harness and the connector. Allows electrical connection. Therefore, even in the second modification, the same action and effect as those in the above embodiment are exhibited. Further, the monitoring board extends intersecting or orthogonal to the side surface 4a of the power storage module 4C and is inserted into the support portion 39. In this case, the monitoring board can be easily inserted into the support portion 39.

(Modification example of metal pin)
FIG. 24 is a perspective view showing the metal pin 100A according to the third modification. The metal pin 100A differs from the metal pin 100 in that it does not have a corner 150. That is, in the metal pin 100A, the first portion 141, the third portion 143, and the fifth portion 145 of the second connecting portion 140 are along the YZ plane as in the second extending portion 130. Even with such a metal pin 100A, a structure in which the contact surfaces 143a and 145a are along the Z-axis direction can be realized. That is, the contact surfaces 143a and 145a of the second connection portions 140 of the plurality of metal pins 100A arranged in the Z-axis direction corresponding to the plurality of conductive plates 5 laminated in the Z-axis direction (stacking direction D1) are Z. It is possible to position them on the same plane along the axial direction. Thereby, the monitoring board 200 can be configured by one circuit board. However, in this case, the monitoring board 200 is arranged along the YZ plane. That is, on the side surface of the module laminate 2 (the side surface facing the direction D2), the monitoring substrate 200 is arranged so as to be parallel to the stacking direction D1 and the direction D2. Therefore, as compared with the case where a plurality of metal pins 100 are used, there is a demerit that the size of the power storage device in the direction D2 becomes large. On the other hand, when the monitoring substrate 200 is arranged so as to be parallel to the stacking direction D1 and the direction D2, the module laminate is compared with the case where the monitoring substrate 200 is arranged parallel to the stacking direction D1 and the direction D3. On the side surface of 2 (the side surface facing the direction D2), the space covered by the monitoring board 200 (and the case for accommodating the monitoring board 200) can be reduced. As a result, there is an advantage that a space for arranging various members (for example, a wiring member connected to the power storage module 4 or the like) can be secured on the side surface of the module laminate 2 (the side surface facing the direction D2).

FIG. 25 is an enlarged view of a main part of the metal pin 100B according to the fourth modification. The metal pin 100B penetrates a part of the second extending portion 130 (here, as an example, a portion where the concave-convex shape portion 133 is provided) in the X-axis direction (the plate thickness direction of the second extending portion 130). It differs from the metal pin 100 in that a through hole 134 extending in the Z-axis direction is provided together with the metal pin 100. As an example, the second extending portion 130 of the metal pin 100B is provided with a plurality of rectangular through holes 134. According to the above configuration, by matching the Z-axis direction with the vertical direction (gravity direction), when the electrolytic solution leaks from the power storage module 4, the electrolytic solution penetrates in the second extending portion 130. It can be easily moved downward at the portion where the hole 134 is provided. That is, before the electrolytic solution is transmitted to the monitoring substrate 200, the electrolytic solution can be easily dropped downward. As a result, it is possible to suppress the transmission of the electrolytic solution to the monitoring substrate 200, and it is possible to suppress the occurrence of tracking and corrosion of the monitoring substrate 200. Further, when the through hole 134 is provided at a position where it overlaps with the concave-convex shape portion 133 in the Y-axis direction as in the metal pin 100B, the electrolytic solution can be efficiently supplied by both the through hole 134 and the concave-convex shape portion 133. Can be dropped downwards.

Although the embodiments and modifications relating to one aspect of the present invention have been described above, one aspect of the present invention is not limited to the above-described embodiments and modifications. The above-described embodiment and each of the above-described modifications may be combined with each other as appropriate. For example, the second modification and the third modification may be combined. In this case, even if the external base is not provided with an opening, the electrical connection between the conductive plate and the monitoring device via the metal pin can be realized.

In the above embodiment and the above modification, the monitoring device includes an external base, but the present invention is not limited to this. The monitoring device may be provided in a housing that houses, for example, an electrode laminate. In this case, for example, a slot may be provided in a part of the housing, and the case may be mounted in the slot. Alternatively, a slot may be installed in the housing, and a case may be installed in the slot. Alternatively, the monitoring device may be provided in the junction box, for example, or may be mounted in the junction box.

In the above-described embodiment and the above-described modified example, the protruding portion provided on the main body of the case has a tip surface, but the present invention is not limited to this. For example, the protrusion does not have to have a tip surface. In this case, the connection surface may be any surface that connects the facing surface facing the monitoring substrate and the tip of the protruding portion. Thereby, when the case is mounted in the slot, the fifth portion of the second connecting portion included in the metal pin is satisfactorily guided to a predetermined position by the connecting surface.

In the above-described embodiment and the above-described modification, both the projecting portion and the partition wall are provided on the main body of the case, but the present invention is not limited to this. For example, one of the projecting portion and the partition wall may be provided on the main body of the case, and the other of the projecting portion and the partition wall may be provided on the cover of the case. In this case, the protrusion and the partition wall are not integrated with each other. Alternatively, the cover of the case may be provided with both a protrusion and a partition wall. If the cover is provided with a bulkhead, the bulkhead may come into contact with the body. As a result, the impact resistance of the partition wall provided on the cover can be improved. Alternatively, the partition wall may not be provided on both the main body and the cover of the case. In this case, the partition wall may be provided only in the slot.

In the above embodiment and the above modification, the connection terminal of the monitoring board is formed by the printed wiring, but is not limited to this. For example, the connection terminal may be formed by mounting the conductive member on the substrate portion. As a specific example, the connection terminal may be formed by fitting a metal plate or an alloy plate made of copper or the like into the substrate portion.

In the above-described embodiment and the above-described modified example, contact surfaces are provided on each of the third portion and the fifth portion of the metal pin, but the present invention is not limited to this. For example, the contact surface may be provided only on one of the third portion and the fifth portion.

1,1B ... power storage device, 4,4C, 4D ... power storage module, 4A ... power storage module (first power storage module), 4B ... power storage module (second power storage module), 5 ... conductive plate (first member, conductive member, 2nd conductive plate), 5A ... 1st conductive plate, 8 ... end plate, 11 ... electrode laminate, 12, 12A ... encapsulant, 14 ... bipolar electrode, 30, 36 ... external base, 30a ... main surface, 30b ... through hole, 35 ... connecting member, 37A, 37B ... connecting member, 38 ... opening, 39 ... support part, 39a ... partition wall, 39b ... eaves part, 40 ... composite case, 50 ... monitoring device, 100, 100A, 100B ... Metal pin, 110 ... 1st connection part (1st terminal, 3rd terminal), 120 ... 1st extending part, 121, 131 ... Bending part, 130 ... 2nd extending part, 130a ... End part, 132 ... Concave part 133 ... Concavo-convex shape part, 134 ... Through hole, 140 ... Second connection part (second terminal, fourth terminal, external terminal), 143a, 145a ... Contact surface, 150 ... Corner part, 200 ... Monitoring board (circuit) Substrate, 2nd member), 211,212 ... Main surface, 221,222 ... Connection terminal, 221b ... End, 230 ... Recess, 230b ... Bottom, 240 ... Measuring circuit, 300 ... Slot, 301 ... 1st terminal guide , 302 ... 2nd terminal guide part, 303 ... connection part, 304 ... outlet, 311, 321 ... partition wall, 312, 322 ... eaves part, 312a ... protrusion part, 313, 323 ... back plate part, 324 ... joint part , 324a ... opening, 400 ... case (accommodation member), 401 ... main body, 402 ... cover, 403 ... opening, 411 ... bottom plate, 421-414 ... side wall, 415 ... connecting wall, 416 ... reinforcing part, 417 ... stepped part 431 ... 1st standing part, 432 ... Extension part, 433 ... 2nd standing part, 433a ... Top surface, 433b ... Outer surface surface, 440 ... Protruding part, 441, 442 ... Side surface, 443 ... Side surface (opposing surface) ) 444 ... Tip surface, 445 ... Connection surface, 450 ... Bulk partition, 451-454 ... Side surface, 455 ... Tip surface, 461 ... Top plate, 462-464 ... Side wall, 471-474 ... Depressed part, 471a, 472a, 474a ... Opening, 600 ... Structure, 601 ... Base, 602 ... Projection, 603 ... Overhang, A ... Region, D1 ... Stacking direction (first direction), D2 ... Direction (second direction), D3 ... Direction ( 3rd direction), S ... space, S1 to S3, S11, S12 ... gap, V ... internal space.

Claims (8)

The first power storage module and the second power storage module, which are laminated in the first direction and connected in series with each other,
A first conductive plate located between the first power storage module and the second power storage module,
A monitoring board that monitors the status of the first power storage module and the second power storage module, and
A first metal pin having a first terminal fixed to the first conductive plate and a second terminal in surface contact with the first connection terminal of the monitoring board, and extending in a second direction intersecting the first direction. ,
A support portion that supports the second terminal of the first metal pin, and a support portion that supports the second terminal.
A power storage device equipped with. The power storage device according to claim 1, wherein the first connection terminal is provided so as to be exposed on a main surface of a substrate body of the monitoring board. 1. The first metal pin is located between the first connection terminal and the support portion, and has an urging portion for urging the second terminal toward the first connection terminal. Or the power storage device according to 2. A second conductive plate located on the opposite side of the first conductive plate via the first power storage module in the first direction,
It further includes a third terminal fixed to the second conductive plate, a fourth terminal in surface contact with the second connection terminal of the monitoring board, and a second metal pin extending in the second direction.
The support portion according to any one of claims 1 to 3, wherein the support portion supports the second terminal of the first metal pin and the fourth terminal of the second metal pin on the same plane. Power storage device. Any one of claims 1 to 4, further comprising an external base on which the monitoring board and the support portion are arranged so as to be separated from the first power storage module and the second power storage module in the second direction. The power storage device described in. The first power storage module has a bipolar electrode and a sealing material for sealing the bipolar electrode.
The power storage device according to any one of claims 1 to 4, wherein the support portion is provided on the surface of the sealing material. The first power storage module has side surfaces along the first direction and a third direction intersecting the first direction and the second direction.
The power storage device according to any one of claims 1 to 6, wherein the monitoring board extends in the extending direction of the side surface. The first power storage module has side surfaces along the first direction and a third direction intersecting the first direction and the second direction.
The power storage device according to any one of claims 1 to 6, wherein the monitoring board extends so as to intersect with the side surface and is inserted into the support portion.

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