JP2011204382A - Battery unit and power supply device using this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated battery unit and a power supply device using the same.SOLUTION: The battery unit 1 is provided with single trays 3 structured so as to be laminated one on another, and a plurality of laminated batteries 2a, 2b, 2c fitted in each tray 3. The plurality of laminated batteries 2a, 2b, 2c are adjacent to each other in a lamination direction of the trays 3, when the trays 3 are laminated.

Description

  The present invention relates to a battery unit including a plurality of laminated batteries and a power supply device using the battery unit.

  In recent years, due to environmental problems, clean energy obtained from wind power generation, solar power generation, and the like that can be used for home use such as detached houses and industrial use such as transportation equipment and construction equipment has attracted attention. However, the clean energy has a problem that the output varies greatly depending on the situation. For example, energy from solar power is obtained during the day when the sun is rising, but not at night after the sun has set.

  In order to stabilize the output of clean energy, a technique for temporarily storing clean energy in a battery is used. For example, solar energy stored in a battery can be used at night after the sun goes down. As a battery for storing such clean energy, a lead storage battery is generally used. However, lead acid batteries are generally large and have the disadvantage of low energy density.

  As an alternative to this lead storage battery, there is a NAS battery (sodium-sulfur battery). NAS batteries are more compact and have higher energy density than lead acid batteries. However, the NAS battery has a high operating temperature range of about 300 ° C., and large-scale incidental equipment including a heater for heating is necessary to operate the NAS battery. Further, since the NAS battery needs to be heated to the operating temperature range in order to operate properly, it takes time to operate.

  In recent years, lithium ion secondary batteries have attracted attention as batteries that can replace NAS batteries. Lithium ion secondary batteries can operate at room temperature and have a high energy density. Moreover, since the lithium ion secondary battery has low impedance, it is excellent in responsiveness.

  A lithium ion secondary battery is generally a compact flat plate, and the entire configuration of the battery excluding the positive electrode and the negative electrode is sealed by laminating. Such a battery is called a laminated battery. Patent Document 1 describes a power supply device to which a laminated battery is applied. In the power supply device described in Patent Document 1, a plurality of laminated batteries are arranged in the horizontal direction and the vertical direction. In this power supply device, each laminated battery is accommodated in a casing.

Japanese Patent No. 3971684

  In the power supply device described in Patent Literature 1, a malfunction may occur when one of the plurality of laminated batteries fails to function. In particular, when all of a plurality of laminated batteries are connected in series, the power supply device itself cannot be used. In such a case, the power supply device needs to be maintained.

  However, in the power supply device described in Patent Document 1, since the casing is made of metal, the number of parts for insulating each laminated battery from the casing is large. For this reason, the work for attaching and detaching the laminated battery becomes complicated, and much maintenance is required.

  Therefore, an object of the present invention is to provide a laminated battery unit that can be easily maintained and a power supply device using the same.

  To achieve the above object, the battery unit of the present invention has a single tray configured to be stackable with each other and a plurality of laminated batteries attached to the tray, and the trays are stacked. The plurality of laminated batteries are adjacent to each other in the stacking direction of the tray.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated battery unit which can be maintained easily, and a power supply device using the same can be provided.

It is a perspective view of the battery unit which concerns on the 1st Embodiment of this invention. 1B is a perspective view of the battery unit shown in FIG. 1A. FIG. It is a perspective view of the tray shown to FIG. 1A. It is a perspective view of the tray shown to FIG. 1A. 1B is a top view of the tray shown in FIG. 1A. FIG. It is a bottom view of the tray shown in FIG. 1A. It is a perspective view of the lamination | stacking state of the battery unit shown in FIG. It is sectional drawing along the A-A 'surface of FIG. 4A. 1 is a perspective view of a power supply device according to a first embodiment of the present invention. It is sectional drawing along the B-B 'surface of FIG. 5A. 1 is a perspective view of a power supply device according to a first embodiment of the present invention. It is the schematic which showed the ion conduction path | route of the power supply device shown to FIG. 5A. It is the schematic which showed the ion conduction path | route of the modification of the power supply device shown in FIG. It is the schematic which showed the ion conduction path | route of the modification of the power supply device shown in FIG. It is a sectional side view of the power supply device which concerns on the 2nd Embodiment of this invention. It is a sectional side view of the comparative example of the power supply device shown in FIG. It is a perspective view of the power supply device which concerns on the 3rd Embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1A and 1B are perspective views showing the battery unit 1 according to the first embodiment of the present invention from above. FIG. 1B shows the battery unit 1 from the opposite side of FIG. 1A in the horizontal direction.

  The battery unit 1 according to this embodiment includes three flat laminated batteries 2a, 2b, and 2c, and a tray 3 to which the laminated batteries 2a, 2b, and 2c are attached.

  In the present embodiment, lithium ion secondary batteries are used as the laminated batteries 2a, 2b, and 2c. However, the laminated battery is not limited to a lithium ion secondary battery, and may be another laminated battery such as a nickel metal hydride battery.

  The three laminated batteries 2a, 2b, 2c are arranged side by side on the tray 3 so that the positive electrode and the negative electrode face opposite sides. That is, the positive and negative electrodes of the laminated batteries 1a and 1c are oriented in the same direction, and the positive and negative electrodes of the laminated battery 1b disposed between the laminated batteries 1a and 1c are the positive and negative electrodes of the laminated batteries 1a and 1c. It faces the opposite direction.

  The positive electrode of the laminated battery 1a and the negative electrode of the laminated battery 1b are connected by the bus bar 4a, and the positive electrode of the laminated battery 2b and the negative electrode of the laminated battery 2c are connected by the bus bar 4b. Thereby, the laminate batteries 2a, 2b, 2c are connected in series. Further, a bus bar 4c is provided on the negative electrode of the laminate 1a, and a bus bar 4d is provided on the positive electrode of the laminate 1c. That is, the bus bar 4 c is a positive terminal of the battery unit 1, and the bus bar 4 d is a negative terminal of the battery unit 1.

  The bus bars 4a, 4b, 4c, and 4d are made of copper or a copper-based compound that has high electrical conductivity and is relatively inexpensive. However, the bus bars 4a, 4b, 4c, and 4d are preferably formed of a material having high electrical conductivity, and may be formed of, for example, silver or a silver-based compound. Further, the bus bars 4a, 4b, 4c, 4d may be formed of inexpensive iron or the like in order to reduce the manufacturing cost.

  The bus bars 4a, 4b, 4c and 4d are screwed to the tray 3 with the positive and negative electrodes of the laminated batteries 2a, 2b and 2c interposed therebetween. Thereby, the bus bars 4a, 4b, 4c, 4d are electrically connected to the positive and negative electrodes of the corresponding laminated batteries 2a, 2b, 2c, respectively, and the laminated batteries 2a, 2b, 2c are mechanically connected to the tray 3. It is fixed to.

  Therefore, the laminated batteries 2a, 2b, 2c can be detached from the tray 3 by removing the bus bars 4a, 4b, 4c, 4d, and conversely, can be attached to the tray 3 by the bus bars 4a, 4b, 4c, 4d. It is. Thus, the laminated batteries 2a, 2b, 2c can be attached and detached very easily by the bus bars 4a, 4b, 4c, 4d. In other words, in the battery unit 1 according to the present embodiment, the number of parts when attaching / detaching the laminated batteries 2a, 2b, 2c is small.

  2A and 2B are perspective views showing only the tray 3 from above. The tray 3 will be described in detail with reference to FIGS. 2A and 2B.

  The tray 3 is made of an insulating material. The tray 3 according to the present embodiment is made of polycarbonate resin. However, the material for forming the tray 3 may be any material having insulating properties such as polypropylene polyethylene, nylon, and PET.

  On the tray 3, a stacking portion 9a on which the laminate battery 2a is stacked, a stacking portion 9b on which the laminate battery 2b is stacked, and a stacking portion 9c on which the laminate battery 2c is stacked are formed. Two protrusions 5a protruding upward are formed at the end of the tray 3 on the stacking portion 9a side, and two protrusions 5b protruding upward are formed at the end of the stacking portion 9c side. The protrusions 5a are formed at wider intervals than the protrusions 5b.

  Since the tray 3 has an insulating property, a part for insulating the laminated batteries 2a, 2b, 2c stacked on the stacking portions 9a, 9b, 9c of the tray 3 is not required. Therefore, in the battery unit 1 according to the present embodiment, the number of parts is small and a simple configuration is realized.

  FIG. 3A is a top view of the tray 3, and FIG. 3B is a bottom view of the tray 3.

  As shown in FIG. 3B, a hole 6a corresponding to the protrusion 5a and a hole 6a corresponding to the protrusion 5b are formed on the back surface of the tray 3. The tray 3 is arranged on the upper surface of the tray 3 so that the two protrusions 5a and the two holes 6a are fitted and the two protrusions 5b and the two holes 6b are fitted. A normal stacked state can be formed by overlapping the back surfaces of different trays 3.

  That is, the tray 3 is configured to be able to overlap the tray 3 different from the tray 3 by being rotated by 180 ° about the central axis orthogonal to the upper surface and the lower surface.

  The protrusions 5a and 5b and the holes 6a and 6b function as a restricting portion that is engaged with each other when the trays 3 are stacked and restricts movement of the tray 3 in a direction different from the stacking direction. Therefore, even when the trays 3 are stacked in multiple stages, the trays 3 are prevented from shifting or collapsing.

  When the trays 3 are stacked, the trays 3 adjacent to each other in the stacking direction have the ends on the stacking portion 9a facing in opposite directions. That is, when the trays 3 are stacked, in the trays 3 adjacent to each other in the stacking direction, the stacking unit 9a and the stacking unit 9c are adjacent to each other in the stacking direction, and the stacking unit 9b is continuous in the stacking direction. If the trays 3 adjacent to each other in the stacking direction are stacked in the same direction, the protrusions 5a and the holes 6a are not fitted and a normal stacking state is not achieved.

  The tray 3 can be stacked on each other even when the laminated batteries 2a, 2b, 2c are attached to the tray 3 by the bus bars 4a, 4b, 4c, 4d bus bars 4a, 4b, 4c, 4d. That is, the battery units 1 can be stacked on each other.

  4A is a perspective view of the seven battery units 1 according to the present embodiment stacked on each other, and FIG. 4B is a cross-sectional view taken along the line A-A ′ of FIG. 4A. As shown in FIG. 4B, when the battery units 1 are stacked on each other, the laminated batteries 2 a and the laminated batteries 2 c are alternately arranged in the stacking direction of the tray 3.

  When the battery unit 1 according to the present embodiment is rotated by 180 ° about the central axis orthogonal to the upper surface and the lower surface, the bus bar 4c as the positive electrode and the bus bar 4d as the negative electrode are reversed. Therefore, as shown in FIG. 4A, the bus bar 4c and the bus bar 4d of the battery unit 1 adjacent to each other are adjacent to each other.

  Next, referring to FIGS. 1A to 3B, an insulating portion 7 is formed on the tray 3. The insulating portion 7 is formed of the same material as that of the tray 3 and is adjacent to the lower side of the tray 3 where the bus bar 4c is attached. On the other hand, the insulating part 7 is not formed below the position of the tray 3 where the bus bar 4d is attached.

  As shown in FIG. 4B, there is an insulating portion 7 between the bus bar 4c and the bus bar 4d adjacent to the lower side of the bus bar 4c. The insulating part 7 having insulation functions to prevent the bus bar 4c and the bus bar 4d adjacent to the lower side of the bus bar 4c from being electrically connected. On the other hand, the insulating portion 7 is not formed between the bus bar 4c and the bus bar 4d adjacent to the bus bar 4c on the upper side. In addition, when viewed from the side opposite to FIG. 4A, in other words, when viewed from the bus bar 4d side of the uppermost laminated battery unit 1, the bus bar 4d and the bus bar adjacent to the bus bar 4d are similarly provided. There is an insulating portion 7 between 4c and the bus bar 4d adjacent to the upper side of the bus bar 4d.

  FIG. 5A is a perspective view of a power supply device 10 formed by stacking seven battery units 1 according to the present embodiment, and FIG. 5B is a cross-sectional view taken along the line BB ′ of FIG. 5A. . The power supply device 10 is obtained by connecting the laminated battery units 1 shown in FIG. The connecting member 8 is attached to the bus bar 4d and the bus bar 4c adjacent to the bus bar 4d on the lower side by screwing or the like. Thereby, the bus bar 4d and the bus bar 4c adjacent to the lower side of the bus bar 4d are electrically connected and mechanically connected.

  In the power supply device 10, as described above, the bus bar 4 c that is the positive electrode and the bus bar 4 d that is the negative electrode of the battery units 1 that are adjacent to each other are adjacent to each other. It is possible.

  In addition, in this embodiment, although the battery unit 1 is provided with the three laminated batteries 2a, 2b, 2c connected in series, the number of the laminated batteries with which the battery unit 1 is provided should just be an odd number. In this configuration, if the number of laminated batteries included in the battery unit 1 is an odd number, the positive bus bar and the negative bus bar are reversed when the battery unit 1 is rotated by 180 ° about the central axis orthogonal to the upper surface and the lower surface. Because it becomes. On the other hand, in the case where the number of laminated batteries included in the battery unit is an even number, a configuration in which the bus bar as the positive electrode and the bus bar as the negative electrode are reversed even if the battery unit is rotated by 180 ° about the central axis orthogonal to the upper surface and the lower surface. It will not be.

  Similar to the bus bars 4a, 4b, 4c, and 4d, the connection member 8 is formed of copper or a copper-based compound that has a high electrical conductivity and is relatively inexpensive. However, the connecting member 8 is preferably formed of a material having high electrical conductivity, and may be formed of, for example, silver or a silver-based compound. Further, the connection member 8 may be formed of inexpensive iron or the like in order to reduce the manufacturing cost.

  The insulating portion 7 may be formed adjacent to the lower side of the tray 3 where the bus bar 4d is attached. In this case, the insulating portion 7 is not formed below the position of the tray 3 where the bus bar 4c is attached, and the connecting member 8 is screwed to the bus bar 4c and the bus bar 4d adjacent to the bus bar 4c on the lower side. It is attached by a stopper.

  As shown in FIG. 5A, the seven battery units 1 that are adjacent to each other in the vertical direction of the power supply device 10 are connected in series by being connected by a connecting member 8. That is, in the power supply device 10, since the three laminated batteries 2a, 2b, and 2c of each battery unit 1 are connected in series, 21 laminated batteries are connected in series. In the power supply device 10, the connection member 4 d of the lowermost battery unit 1 is a positive electrode terminal, and the connection member 4 c of the uppermost battery unit 1 is a negative electrode terminal.

  The power supply device 10 shown in FIG. 5A needs to be provided with a control board for preventing overcharge and overdischarge in order to operate the lithium ion battery safely. FIG. 6 is a perspective view of the power supply device 10 with the control board 11 stacked on the top. The control board 11 has the same external shape as the battery unit 1 and is formed so as not to protrude greatly in a direction different from the stacking direction of the battery units 1 when being stacked on the battery unit 1. The control board 11 is connected to the bus bar 4d of the lowermost battery unit 1 that is the positive terminal of the power supply device 10 and the bus bar 4c of the uppermost battery unit 1 that is the negative terminal of the power supply device. The control board 11 is provided with an electric circuit (not shown) and the like, and the control board 11 enables safe input / output of power from the power supply device 10.

  In the power supply device 10, the output voltage can be changed by changing the number of battery units 1 stacked on each other. That is, when the number of laminated battery units 1 laminated in the laminated battery module 10 is increased, the output voltage of the laminated battery module 10 is increased, and when the number of laminated battery units 1 laminated is decreased, the laminate battery unit 1 is laminated. The output voltage of the battery module 10 decreases.

  Further, since the insulating material such as polycarbonate resin forming the tray 3 of the battery unit 1 is lightweight, even when a large number of battery units 1 are stacked, the load applied to the tray 3 of the lower battery unit 1 is small. The battery unit 1 on the side is not easily damaged. Therefore, in the power supply device 10, a large number of power supply units 1 can be stacked.

  Each battery unit 1 can be removed from the battery units adjacent to each other vertically by detaching the connecting member 8 from the bus bars 4c and 4d. Therefore, in the power supply device 10 according to the present embodiment, even when a failure occurs in one of the plurality of battery units 1, the battery unit 1 can be removed and replaced with a new battery unit 1. .

  Further, as described above, since the three laminated batteries 2a, 2b, and 2c provided in the battery unit 1 are detachable, only the laminated battery in which a problem occurs among the three laminated batteries 2a, 2b, and 2c is replaced. Is possible. Therefore, in the power supply device 10, when one of the plurality of battery units 1 has a problem, the defect occurs in the battery unit 1 removed from the power supply device 10 without preparing a new battery unit 1. It can be restored by replacing only the laminated battery and returning it to the same position of the power supply device 10 again.

  Thus, the power supply device according to the present embodiment can be easily maintained.

  FIG. 7 is a schematic diagram showing the ion conduction path P of the power supply device 10 shown in FIG. The bus bar 4d of the lowermost battery unit 1 that is the positive terminal is connected to the control board 11 via the lead wire 12, and the bus bar 4c of the uppermost battery unit 1 that is the negative terminal is directly connected to the control board 11. .

  As a modification of the present embodiment, the connection path of the laminate battery can be changed as in the power supply device 10a shown in FIG. 8A by changing the shape and arrangement of the bus bar and the connection member. Also in this case, all the laminated batteries 2a, 2b, 2c in the power supply device 10a are connected in series, and an output voltage equivalent to that of the power supply device 10 shown in FIG. 7 can be obtained. Also in the power supply device 10a, the bus bar 4d of the lowermost battery unit 1a serves as a positive electrode terminal, and the bus bar 4c of the uppermost battery unit 1a serves as a negative electrode terminal.

  Further, as a modification of the present embodiment, the number of laminate units stacked on the tray of one battery unit can be changed as appropriate by changing the configuration of the tray. Thereby, the total capacity of one battery unit can be changed.

  FIG. 8B shows a power supply device 10b in which the number of laminate units stacked on one battery unit tray is changed. Each tray 3b of the power supply device 10b shown in FIG. 8B includes four laminated batteries 2a, 2b, 2c, and 2d. In the power supply device 10b, the connection member 4d of the uppermost battery unit 1b serves as a positive electrode terminal, and the connection member 4c of the uppermost battery unit 1b serves as a negative electrode terminal. Therefore, the positive terminal and the negative terminal can be directly connected to the control board 11 without providing the lead wires 12 of the power supply devices 10 and 10a shown in FIGS. 7 and 8A. Thereby, the internal resistance of the power supply device can be reduced, and the manufacturing process and manufacturing cost can be reduced. FIG. 8B shows the case where the number of laminated batteries in each battery unit 1b is four, but the same effect can be obtained if the number of laminated batteries is an even number.

In the power supply device according to this embodiment, all the laminated batteries of each battery unit are connected in series. However, the power supply device changes the configuration of the tray and changes the configuration of the bus bar and connection member accordingly, so that all the laminated batteries can be connected in parallel or a part of the laminated batteries can be connected in series. Of course, it is possible to connect and connect others in parallel.
(Second Embodiment)
FIG. 9 is a side sectional view of the power supply device 20 according to the second embodiment of the present invention. In the power supply device 20, four battery units 1c are stacked on each other. The power supply device 20 according to the present embodiment is configured in the same manner as the power supply device 10 according to the first embodiment except for the configuration described below.

  The tray 13 of the battery unit 1c according to the present embodiment is provided with a partition wall that covers the side surfaces of the laminated batteries 2a, 2b, and 2c. The battery units 1c are stacked on each other, and a private chamber that covers the laminated batteries 1a, 1b, and 1c is formed by the tray 13 and the lower surface of the tray 13 adjacent to the tray 13 on the upper side. Only the uppermost battery unit 1c has no adjacent tray 13 on the tray 13, but a lid 14 formed of the same material as the tray 13 is provided on the uppermost battery unit 1c. The lid 14 can be replaced by a control board as shown in FIG.

  As described in the first embodiment, the tray 13 is made of a material having low thermal conductivity. Therefore, the heat generated by each laminated battery 2 a, 2 b, 2 c is not easily released from the tray 13.

  FIG. 9 is a sectional side view of a comparative example of the power supply device 20 according to the present embodiment. In the power supply device 20a, four battery units 1d are stacked on each other. In the power supply device 20a, the laminated batteries 2a, 2b, and 2c are not covered with a tray like the power supply device 20 shown in FIG. Therefore, the heat generated by each laminated battery 2a, 2b, 2c is likely to diffuse around. Therefore, in the power supply device 20a, the central region surrounded by the alternate long and short dash line, where heat is easily applied from the surrounding laminated battery, becomes high temperature. Therefore, in the power supply device 20a, the temperature environment of the laminated battery in the central region and the laminated battery in the outer peripheral portion is not uniform, and there is a high possibility that it becomes a problem as a power supply device.

  On the other hand, in the power supply device 20 shown in FIG. 10, since the heat generated by each of the laminated batteries 2a, 2b, 2c tends to stay in each individual chamber of the tray 13, all the individual chambers of the tray 13 have a substantially constant temperature. In other words, it is difficult for the ambient temperature distribution to occur between the laminated batteries 2a, 2b, and 2c. Therefore, in the power supply device 20 according to the present embodiment, the respective laminated batteries 2a, 2b, 2c are less likely to cause problems.

  In addition, when one laminated battery reaches a thermal runaway, there is a high possibility that a so-called explosion phenomenon will occur, in which adjacent laminated batteries are successively brought into thermal runaway due to the generated heat.

On the other hand, in the power supply device 20 shown in FIG. 10, heat is not easily transmitted to the outside of each private room, so that even when one laminated battery reaches a thermal runaway, it is difficult to cause an explosion.
(Third embodiment)
FIG. 11 is a perspective view of a power supply device 30 according to the third embodiment of the present invention. In the power supply device 30, a plurality of battery units 1e are stacked on each other. The power supply device 30 according to the present embodiment is configured in the same manner as the power supply device 10 according to the first embodiment except for the configuration described below. For simplicity, the tray 23 of each battery unit 1e is indicated by a broken line.

  In each battery unit 1e of the power supply device 30 according to the present embodiment, the positive and negative electrodes of the laminated batteries 22a, 22b, and 22c are drawn out in the same direction. In the power supply device 30, the negative electrode of the laminated battery 22a and the positive electrode of the laminated battery 22b are connected by the bus bar 24a, and the negative electrode of the laminated battery 22b and the positive electrode of the laminated battery 22c are connected by the bus bar 24b. Thereby, the laminate batteries 22a, 22b, and 22c are connected in series. Further, the negative electrode of the laminated battery 22c is connected to the positive electrode of the laminated battery 22a of the battery unit 1e adjacent to the battery unit 1e on the lower side.

  Thus, in the power supply device 30, the laminated batteries 22a, 22b, and 22c of each battery unit 1e are connected in series, and each battery unit 1e is further connected in series. Therefore, in the power supply device 30, the positive electrode of the laminated battery 22a of the uppermost battery unit 1e is a positive electrode terminal, and the negative electrode of the laminated battery 22c of the lowermost battery unit 1e is a negative electrode terminal.

DESCRIPTION OF SYMBOLS 1 Battery unit 2a, 2b, 2c Laminated battery 3 Tray 4a, 4b, 4c, 4d Bus bar 5a, 5b Protrusion part 6a, 6b Hole part 7 Insulation part 8 Connection member 10 Power supply device

Claims (9)

  A single tray configured to be stackable with each other, and a plurality of laminated batteries attached to the tray, and when the trays are stacked, the plurality of laminated batteries are mutually aligned in the stacking direction of the tray. Adjacent battery unit.   2. The battery unit according to claim 1, further comprising a restricting portion that restricts movement of the tray in a direction different from the stacking direction when the tray is stacked.   The battery unit according to claim 1 or 2, wherein when the tray is stacked, positive and negative electrodes of the plurality of laminated batteries are adjacent to each other in the stacking direction.   The battery unit according to any one of claims 1 to 3, wherein the tray is provided with a partition wall that surrounds an outer periphery of each laminated battery. The laminated batteries are connected in series,
The positive terminal and the negative terminal connected to both ends of the series connection, and when the tray is stacked, the positive terminal and the negative terminal are adjacent to each other in the stacking direction. The battery unit according to any one of claims.   Insulation that is provided adjacent to one of the positive electrode terminal and the negative electrode terminal and separates the positive electrode terminal and the negative electrode terminal that are adjacent to each other in the stacking direction when the tray is stacked. The battery unit according to claim 5, wherein a portion is provided. A plurality of battery units according to any one of claims 1 to 6,
And a connecting member that connects battery units adjacent to each other in the stacking direction of the trays stacked on each other.   A connecting member that connects the battery units in series in the stacking direction by connecting the plurality of battery units according to claim 5 and the positive electrode terminal and the negative electrode terminal adjacent to each other in the stacking direction. , Having a power supply.   The power supply device according to claim 7, further comprising a control board that can be stacked on the tray and controls output power from the plurality of battery units.

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