Power supply device

Abstract

The present invention improves reliability by making it possible to firmly couple a plurality of circuit boards while achieving a structure to / from which the circuit boards can be attached / detached, and stabilize excellent vibration resistance and the long-term electric connection of the circuit boards. This power supply device has a structure in which: a board unit 3 comprising a plurality of circuit boards 8 connected to a battery unit 2 is coupled, in an attachable / detachable manner, by electrically connecting a plurality of vertical circuit boards 8V to a horizontal circuit board 8H via an attaching / detaching coupling part 9; the attaching / detaching coupling part 9 is formed from an L-shaped bus bar 9C constituted by an L-shaped metal plate, and an attachable / detachable setscrew 12; and a circuit board 8 can be replaced while electrically connecting the vertical circuit boards 8V and the horizontal circuit board 8H via the L-shaped bus bar 9C by coupling a bent piece 10 of the L-shaped bus bar 9C to the vertical circuit boards 8V via the setscrew 12, which can be attached / detached to / from the horizontal circuit board 8H.

Description

power supply

[0001] The present disclosure relates to a power supply device having multiple circuit boards, and more particularly to a power supply device that allows replacement of a faulty circuit board.

[0002] A power supply device has the advantage of being able to simplify each circuit board and reduce costs by dividing the circuit board into multiple boards. Furthermore, a device consisting of multiple circuit boards can be designed to allow for the replacement of faulty circuit boards, which simplifies maintenance and is expected to be economically effective. This is because by replacing some of the faulty circuit boards, the device can be restored to normal operation and reused. A structure that allows for the replacement of faulty circuit boards can be realized by a structure in which the circuit boards are detachably connected via connectors. This structure can be realized, for example, by connecting multiple vertical circuit boards to a horizontal circuit board via connectors, and detachably connecting the vertical circuit boards while electrically connecting them to the horizontal circuit boards, as disclosed in Patent Document 1.

[0003] Japanese Patent Application Laid-Open No. 2022-170029

[0004] A structure that detachably connects a vertical circuit board to a horizontal circuit board via a connector has the advantage of allowing the vertical circuit board to be easily detached and replaced. However, a connector-based connection structure has the disadvantage that it is difficult to achieve high impact resistance and connect multiple circuit boards. Furthermore, it is difficult to maintain a stable electrical connection between a vertical circuit board and a horizontal circuit board over a long period of time. Furthermore, connectors are limited in their maximum current capacity and are unable to eliminate failures due to poor contact between the contacts. This is because the connectors use elastic force to press the contacts together, resulting in localized contact and electrical connection. While this connection structure is expected to increase the contact area and contact pressure of the contacts, thereby increasing the maximum current, contacts with large contact areas cannot be made to contact over a wide area, and contacts with high contact pressure are difficult to detach smoothly.

[0005] The present invention was developed with the aim of further resolving the above-mentioned problems, and one object of the present invention is to provide a power supply device that has a structure that allows the circuit boards to be simply and easily attached and detached, firmly connects the horizontal circuit board and the vertical circuit board to achieve excellent vibration resistance, and further allows the horizontal and vertical circuit boards to be electrically connected stably over a long period of time.

[0006] The power supply device includes a battery unit having a plurality of secondary batteries and a board unit consisting of a plurality of circuit boards connected to the battery unit, and the board unit has all of the following configurations (a) to (g): (a) The board unit includes a horizontal circuit board arranged in a horizontal position and a plurality of vertical circuit boards fixed vertically to the horizontal circuit board. (b) The board unit includes a detachable coupling part that detachably couples the horizontal circuit board and the vertical circuit board. (c) The detachable coupling part includes an L-shaped bus bar made of an L-shaped metal plate and a set screw that detachably couples the L-shaped bus bar to the circuit board. (d) The L-shaped bus bar is a conductive metal plate formed by connecting a pair of bent pieces in an L shape. (e) The L-shaped bus bar has one bent piece fixed to the surface of the vertical circuit board and the other bent piece fixed to the surface of the horizontal circuit board, connecting the vertical circuit board and the horizontal circuit board at a right angle. (f) The circuit board connected to the L-shaped bus bar has conductive terminal portions formed by stacking and electrically connecting the bent pieces of the L-shaped bus bar. (g) Set screws penetrate the circuit board, fix the L-shaped bus bar to the circuit board, and electrically connect the bent pieces of the L-shaped bus bar to the conductive terminal portions of the circuit board.

[0007] The above power supply unit has a structure that allows the circuit boards to be simply and easily attached and detached, while the horizontal and vertical circuit boards are firmly connected to achieve excellent vibration resistance, and it also has the advantage of being able to maintain a stable electrical connection between the horizontal and vertical circuit boards over the long term.

[0008] 1 is a schematic perspective view of a power supply device according to an embodiment of the present disclosure. FIG. 1 is a schematic longitudinal sectional view of the power supply device shown in FIG. 1. FIG. 1 is a schematic exploded perspective view of the power supply device shown in FIG. 3 is a schematic exploded perspective view further disassembled. FIG. 2 is a schematic block diagram of a power supply device according to an embodiment of the present disclosure. FIG. 3 is a schematic perspective view of a board unit of the power supply device shown in FIGS. 1 to 4. FIG. 4 is a schematic sectional perspective view of the board unit portion of the power supply device shown in FIG. 1 taken along line X-X. FIG. 6 is a schematic exploded perspective view of the board unit of FIG. 6 further disassembled. FIG. 6 is a schematic sectional perspective view of the board unit portion of the power supply device shown in FIG. 1 taken along line Y-Y. FIG. 1 is a schematic sectional view of the board unit of the power supply device shown in FIG. 1 taken along line X-X. FIG. 12 is a schematic exploded perspective view of the board unit of FIG. 12 further disassembled. FIG. 12 is a schematic sectional perspective view of the board unit with the vertical circuit board visible, obtained by cutting the power supply device of FIG. 1 along line X-X and removing the mounted components from the circuit board, and a partial sectional perspective view showing an example of a recess of a bracket. Fig. 2 is a schematic cross-sectional perspective view of the power supply device of Fig. 1 taken along line YY and with mounted components removed from the circuit board Fig. 3 is a schematic enlarged cross-sectional view showing another embodiment of the detachable connecting portion and the fixing portion of the circuit board.

[0009] The embodiments of the present disclosure may be specified by the following configurations and features. A power supply device according to one embodiment of the present disclosure includes: a battery unit including a plurality of secondary batteries; and a board unit including a plurality of circuit boards connected to the battery unit, wherein the board unit includes all of the following configurations (a) to (g): (a) The board unit includes: a horizontal circuit board arranged in a horizontal position; and a plurality of vertical circuit boards fixed perpendicularly to the horizontal circuit board. (b) The board unit includes: a detachable coupling portion that detachably couples the horizontal circuit board and the vertical circuit board. (c) The detachable coupling portion includes: an L-shaped bus bar made of an L-shaped metal plate; and a set screw that detachably couples the L-shaped bus bar to the circuit board. (d) The L-shaped bus bar is a conductive metal plate formed by connecting a pair of bent pieces in an L-shape. (e) The L-shaped busbar has one bent piece fixed to the surface of the vertical circuit board and the other bent piece fixed to the surface of the horizontal circuit board, connecting the vertical and horizontal circuit boards at a right angle. (f) The circuit board connected to the L-shaped busbar has conductive terminals formed by stacking and electrically connecting the bent pieces of the L-shaped busbar. (g) Set screws pass through the circuit board to fix the L-shaped busbar to the circuit board and electrically connect the bent pieces of the L-shaped busbar to the conductive terminals of the circuit board.

[0010] In the power supply described above, the circuit boards can be easily attached and detached by simply attaching and detaching the set screws. The bent pieces of the L-shaped bus bar are stacked on the conductive terminals on the surfaces of the vertical and horizontal circuit boards, and the set screws are screwed in, firmly connecting the horizontal and vertical circuit boards via the L-shaped bus bar, achieving excellent vibration resistance. Furthermore, the bent pieces of the L-shaped bus bar are fixed to the conductive terminals on the circuit boards with set screws, achieving a stable electrical connection between the horizontal and vertical circuit boards over a long period of time. Because the power supply described above is composed of multiple circuit boards in a board unit, the number of components mounted on each circuit board can be reduced, allowing for inexpensive mass production. Furthermore, because only a specific circuit board that has failed can be easily replaced by simply attaching and detaching the set screws, it can be used stably over a long period of time with simple maintenance. Furthermore, the low cost of replacement circuit boards significantly reduces maintenance costs.

[0011] In another embodiment of the power supply device of the present disclosure, the board unit may be configured to include a discharge circuit board mounted with a constant voltage circuit that controls the output voltage of the battery unit, a charging circuit board mounted with a charging circuit that controls the charging of the battery unit, and a control circuit board connected to the discharge circuit board and the charging circuit board. The power supply device described above is configured with a board unit including a charging circuit board, a discharge circuit board, and a control circuit board. This allows dedicated circuits for the discharge circuit (constant voltage circuit), the charging circuit, and the control circuit to be provided on each circuit board, resulting in an ideal circuit configuration. In particular, in a board unit in which one or more dedicated circuits for the discharge circuit, the charging circuit, and the control circuit are configured on multiple circuit boards, the output of the discharge circuit or the charging circuit can be adjusted to an optimal output for the application by manufacturing circuit boards with the same circuit configuration and connecting them in parallel. Furthermore, the power supply device described above has the advantage of separately arranging the discharge circuit, the charging circuit, and the control circuit, thereby suppressing heat generation from each heat-generating component and improving heat dissipation efficiency.

[0012] In another embodiment of the power supply device of the present disclosure, the detachable coupling portion further includes an L-shaped metal fitting that couples the vertical circuit board and the horizontal circuit board without electrically connecting them, and the horizontal circuit board is configured to include a circuit board on the bottom plate and a circuit board on the top plate, where the circuit board on the bottom plate is coupled to the lower edge of the vertical circuit board via an L-shaped bus bar, and the circuit board on the top plate, among the horizontal circuit boards, is coupled to the upper end of the vertical circuit board via an L-shaped metal fitting, and the circuit board on the bottom plate and the circuit board on the top plate are coupled via a plurality of vertical circuit boards. In this power supply device, the circuit board on the bottom plate and the circuit board on the top plate are firmly fixed at right angles to each other via the L-shaped bus bar and the L-shaped metal fittings, so that the upper and lower edges of the plurality of vertical circuit boards are firmly fixed at right angles to each other via the L-shaped bus bar and the L-shaped metal fittings, and therefore the upper edges of the plurality of vertical circuit boards whose lower edges are fixed to the circuit board on the bottom plate are coupled to the circuit board on the top plate, and the vertical circuit boards and the horizontal circuit boards are coupled to each other in a strong rectangular tube shape, which has the advantage of significantly improving the vibration resistance of the board unit. Furthermore, the power supply device described above has the advantage of being able to achieve extremely high vibration resistance while realizing a structure that allows each circuit board to be simply and easily detached and replaced.The power supply device described above has the advantage that the circuit board on the bottom plate can be connected to the vertical circuit board via an L-shaped bus bar that electrically connects it, and in addition, the circuit board on the top plate can be connected to the vertical circuit board via L-shaped metal fittings without being electrically connected.In addition to the L-shaped bus bar, the power supply device described above can connect the vertical and horizontal circuit boards by positioning the L-shaped metal fittings in preferred positions, without requiring electrical connection to the circuit boards, i.e., without being restricted in connection position.Therefore, the vertical and horizontal circuit boards can be fixed with extremely high connection strength via the detachable connection part having the L-shaped bus bar and the L-shaped metal fittings, thereby achieving high vibration resistance.

[0013] In another embodiment of the power supply device of the present disclosure, multiple vertical circuit boards can be connected to both sides of a horizontal circuit board via an L-shaped bus bar. In this power supply device, multiple vertical circuit boards are connected to both sides of a horizontal circuit board via an L-shaped bus bar, thereby connecting the vertical and horizontal circuit boards to form an extremely strong rectangular tube, further improving the vibration resistance of the board unit. This power supply device also has the advantage of being able to achieve extremely high vibration resistance while realizing a structure that allows each circuit board to be simply and easily detached and replaced.

[0014] In another embodiment of the power supply device of the present disclosure, the board unit is configured to include a discharge circuit board mounted with a constant voltage circuit that controls the output voltage of the battery unit, a charging circuit board mounted with a charging circuit that controls the charging of the battery unit, and a control circuit board connected to the discharge circuit board and the charging circuit board, where the discharge circuit board and the control circuit board can be vertical circuit boards and the charging circuit board can be horizontal circuit board. Since the discharge circuit board and the control circuit board are vertical circuit boards, this power supply device has the advantage of being able to efficiently dissipate heat from the heat-generating components of the constant voltage circuit mounted on the discharge circuit board and the heat-generating components of the control circuit mounted on the control circuit board. This is because the rising air flowing over the surfaces of the discharge circuit board and the control circuit board, which are arranged in a vertical position, can cool the heat-generating components of the constant voltage circuit and the control circuit.

[0015] In another embodiment of the power supply device of the present disclosure, the board unit includes a discharge circuit board mounted with a constant voltage circuit that controls the output voltage of the battery unit, a charging circuit board mounted with a charging circuit that controls charging of the battery unit, and a control circuit board connected to the discharge circuit board and the charging circuit board, wherein the discharge circuit board and the control circuit board are vertical circuit boards and the charging circuit board is horizontal circuit board, and further, multiple vertical circuit boards are connected to the horizontal circuit board by providing cooling ducts extending in the vertical direction between adjacent vertical circuit boards, and the discharge circuit board has heat-generating components thermally coupled to a radiator on its surface, and the radiator is disposed in the cooling duct. In this power supply device, the discharge circuit board and the control circuit board are vertical circuit boards, and a cooling duct extending in the vertical direction is provided between the multiple vertical circuit boards arranged in a vertical position, and a radiator thermally coupled to the heat-generating components of the vertical circuit boards is disposed in this cooling duct, thereby having the advantage of being able to efficiently cool the heat-generating components disposed in the cooling duct. In particular, the power supply unit described above has cooling ducts between multiple vertical circuit boards, and the spacing between these cooling ducts can be set to increase the flow rate of convection air, allowing the convection air to efficiently cool the heat sink, efficiently dissipating the thermal energy of the heat-generating components and minimizing the temperature rise of the heat-generating components.

[0016] In another embodiment of the power supply device of the present disclosure, a constant voltage circuit consisting of a DC / DC converter that stabilizes and outputs the output voltage of the battery unit is mounted on the discharge circuit board, and the heat-generating component placed in the cooling duct can be the semiconductor switching element of the DC / DC converter. This power supply device has the advantage of efficiently cooling the semiconductor switching element of the DC / DC converter mounted on the charge circuit board as the constant voltage circuit of the discharge circuit, allowing the DC / DC converter to stably supply large output to the load.

[0017] In another embodiment of the power supply device of the present disclosure, the board unit is configured to include a discharge circuit board having a constant voltage circuit mounted thereon that controls the output voltage of the battery unit, a charging circuit board having a charging circuit mounted thereon that controls the charging of the battery unit, and a control circuit board connected to the discharge circuit board and the charging circuit board, wherein the discharge circuit board and the control circuit board are vertical circuit boards and the charging circuit board is a horizontal circuit board, and the multiple vertical circuit boards can be connected in parallel via an L-shaped bus bar and the horizontal circuit board. In the above power supply device, a plurality of discharge circuit boards are fixed in a vertical position to a horizontal circuit board via an L-shaped bus bar, and the plurality of discharge circuit boards are connected in parallel via the L-shaped bus bar and the horizontal circuit board. Therefore, the horizontal circuit board and the L-shaped bus bar are used both as a fixing member that fixes the plurality of discharge circuit boards in fixed positions in a vertical position, and as a connection circuit that connects the plurality of discharge circuit boards in parallel. This has the advantage that the plurality of discharge circuit boards and the horizontal circuit board are firmly connected to achieve excellent vibration resistance, and further the plurality of discharge circuit boards can be electrically connected by a low-resistance circuit.

[0018] In another embodiment of the power supply device of the present disclosure, the horizontal circuit board includes a circuit board on a top plate and a circuit board on a bottom plate, and the detachable connecting portion further includes L-shaped metal fittings that connect the vertical circuit board and the horizontal circuit board without electrically connecting them, and the L-shaped bus bar and L-shaped metal fittings are arranged at diagonal positions on the vertical circuit board, so that the vertical circuit board can be connected to the circuit board on the bottom plate and the circuit board on the top plate via the L-shaped bus bar and L-shaped metal fittings arranged at diagonal positions.The above power supply device has the advantage that the vertical circuit board can be fixed to the horizontal circuit board while preventing overall deformation of the vertical circuit board, because the detachable connecting portion arranges the L-shaped bus bar and L-shaped metal fittings at diagonal positions on the vertical circuit board and connects it to the horizontal circuit board.

[0019] In another embodiment of the power supply device of the present disclosure, the horizontal circuit board includes a circuit board on a top plate and a circuit board on a bottom plate, and the circuit board unit is provided with a vertical connecting bar connecting the circuit boards on the top plate and the circuit board on the bottom plate, and the circuit boards on the top plate and the circuit board on the bottom plate can be detachably connected to each other using both the detachable connecting part and the vertical connecting bar. This power supply device connects the vertical circuit board and the horizontal circuit board via the detachable connecting part, and further connects the circuit board on the top plate and the circuit board on the bottom plate with the vertical connecting bar, thereby further improving the vibration resistance of the circuit board unit consisting of the vertical circuit board and the horizontal circuit board. This is because the circuit board on the top plate and the circuit board on the bottom plate are connected by multiple vertical circuit boards via the detachable connecting part and are further connected by the vertical connecting bar.

[0020] In another embodiment of the power supply device of the present disclosure, the horizontal circuit board includes a circuit board on a top plate and a circuit board on a bottom plate, and the board unit is provided with a vertical connecting bar connecting the circuit board on the top plate to the circuit board on the bottom plate, and the vertical connecting bar connects the ends of the circuit board on the top plate to the circuit board on the bottom plate. In addition to connecting the circuit board on the top plate to the circuit board on the bottom plate with the vertical connecting bar, this power supply device has the advantage of efficiently improving the vibration resistance of the board unit.

[0021] In another embodiment of the power supply device of the present disclosure, the horizontal circuit board includes a circuit board on a top plate and a circuit board on a bottom plate, the board unit includes a vertical connecting bar connecting the circuit boards on the top plate and the bottom plate, and the detachable connector further includes an L-shaped metal fitting connecting the vertical circuit board and the circuit board on the top plate without electrically connecting them, so that the upper end of the vertical connecting bar is connected to the end of the vertical circuit board opposite the connection part between the vertical circuit board and the circuit board on the top plate provided by the L-shaped metal fitting. This power supply device has the advantage that, in addition to connecting one end of the circuit board on the top plate to the circuit board on the bottom plate with the vertical connecting bar, the detachable connector including the L-shaped metal fitting connects the other end of the circuit board on the top plate to the circuit board on the bottom plate via the vertical circuit board, thereby connecting both ends of the horizontal circuit board to the circuit board on the bottom plate, thereby improving the vibration resistance of the battery unit.

[0022] In another embodiment of the power supply device of the present disclosure, the horizontal circuit board includes a circuit board on a top plate and a circuit board on a bottom plate, and the board unit includes a metal plate bracket fixed to the upper surface of the circuit board on the top plate, and the board unit is configured such that the circuit board on the top plate is fixed to the outer case via the bracket, and the circuit board on the bottom plate is fixed to the outer case.The above power supply device has the advantage of significantly improving the vibration resistance of the board unit, in which the circuit board on the top plate is fixed to the outer case via the metal plate bracket, and the circuit board on the bottom plate is fixed to the outer case.Furthermore, the above power supply device has the advantage of extremely high vibration resistance while realizing a structure that allows each circuit board to be simply and easily detached and replaced.

[0023] In another embodiment of the power supply device of the present disclosure, a plurality of power supply devices can be connected in parallel and used as a backup power supply that supplies power to a load during a power outage. The above power supply devices have the advantage of being able to stably supply large amounts of power to a load in a short period of time when used as a backup power supply by connecting multiple power supply devices in parallel.

[0024] The present invention will be described in detail below with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., "upper," "lower," and other terms including these terms) will be used as necessary. However, the use of these terms is intended to facilitate understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. Furthermore, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or components. Furthermore, the embodiments described below are illustrative examples of the technical concept of the present invention and do not limit the scope of the present invention to the following. Furthermore, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described below are intended for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, the content described in one embodiment or example can also be applied to other embodiments or examples. Furthermore, the size and positional relationships of components shown in the drawings may be exaggerated for clarity. (Embodiment 1)

[0025] 1 to 3, the power supply device 1 with replaceable circuit board 8 includes a battery unit 2 equipped with a plurality of secondary batteries 6, and a board unit 3 connected to the battery unit 2. The power supply device 1 described above includes an exterior case 4 in the shape of a long, rectangular tube, but the power supply device 1 can also be placed inside the exterior case of the device to which it supplies power, so the exterior case 4 is not necessarily required for the power supply device 1. The power supply device 1 shown in FIGS. 1 to 4 has positive and negative output terminals 5 at its rear end, but this power supply device 1 can be inserted into a rack such as a backup power supply, and supply power to a load from the output terminals 5 at its rear end.

[0026] In addition to the excellent advantage of a structure that allows for easy replacement of the circuit board 8, the power supply unit 1 also achieves the high reliability required of a power supply that stably supplies power to a load for a variety of uses. A highly reliable power supply unit 1 has the advantage of being able to be used safely for a wide range of uses, for example, by stably supplying power to a server until a generator starts up during a power outage, or by being used as a backup power source. The power supply unit 1 described below has a convenient structure that allows for easy replacement of a faulty circuit board 8, while also having a unique circuit configuration and structure that achieves even higher reliability. (Battery unit 2)

[0027] The battery unit 2 shown in the exploded perspective views of Figures 3 and 4 has multiple rechargeable secondary batteries 6 arranged in fixed positions in battery holders and connected in parallel with DC current via lead plates 7. The battery unit 2 sets the output voltage to a voltage suitable for the application by adjusting the number of secondary batteries 6 connected in series, sets the maximum output current to an optimum value by adjusting the number of secondary batteries 6 connected in parallel, and further sets the charge / discharge capacity to a value suitable for the application by adjusting the number of secondary batteries 6 connected in series and parallel. The battery unit 2 supplies power to the load by controlling the charge and discharge current using the board unit 3, and is charged by external power input from the output terminal 5. (Board unit 3)

[0028] Figures 6 to 11 show a board unit 3 consisting of a circuit board 8 with components mounted on its surface, while Figures 12 to 16 show a board unit 3 of the circuit board 8 without the components mounted thereon to make it easier to understand the connection structure of the circuit board 8. The board unit 3 shown in Figures 7, 8, and 12 to 14 includes a horizontal circuit board 8H arranged in a horizontal position, multiple vertical circuit boards 8V fixed vertically to the horizontal circuit board 8H, and detachable connectors 9 that detachably connect the horizontal circuit board 8H and the vertical circuit boards 8V. The vertical circuit board 8V and the horizontal circuit board 8H form circuit boards 8 that implement a discharging circuit board 8D that stabilizes the output of the battery unit 2 and supplies it to a load, a charging circuit board 8C that charges the battery unit 2, and a control circuit board 8S that is connected to the discharging circuit board 8D and the charging circuit board 8C. The discharge circuit board 8D is equipped with a constant voltage circuit for the discharge circuit that controls the voltage input from the battery unit 2 to a constant voltage and outputs it. The charge circuit board 8C is equipped with a charge circuit that controls the charge state of the battery unit 2. The control circuit board 8S is connected to the discharge circuit board 8D and the charge circuit board 8C, and controls the discharge circuit and the charge circuit.

[0029] The board unit 3 is composed of a vertical circuit board 8V, which is vertically oriented and includes a discharging circuit board 8D, a charging circuit board 8C, and a control circuit board 8S, and a horizontal circuit board 8H, which is horizontally oriented. The detachable connecting portion 9 is composed of an L-shaped bus bar 9C that electrically connects the vertical circuit board 8V to the horizontal circuit board 8H, and an L-shaped metal fitting 9I that connects the vertical circuit board 8V to the horizontal circuit board 8H without electrically connecting them. The L-shaped bus bar 9C and the L-shaped metal fitting 9I are L-shaped metal plates that connect a pair of bent pieces 10 at right angles. The pair of bent pieces 10 are electrically connected to conductive terminals 11 provided on the surfaces of the vertical circuit board 8V and the horizontal circuit board 8H and are detachably fixed via set screws 12. The pair of bent pieces 10 consists of a horizontal piece 10H and a vertical piece 10V. The horizontal piece 10H is electrically connected to the conductive terminal portion 11 of the horizontal circuit board 8H and is detachably fixed with a set screw 12. The vertical piece 10V is electrically connected to the conductive terminal portion 11 on the surface of the vertical circuit board 8V and is detachably fixed with a set screw 12.

[0030] The board unit 3 shown in the block diagram of Figure 5 has multiple vertical circuit boards 8V as multiple discharge circuit boards 8D, and the remaining circuit boards 8 are control circuit boards 8S. In the above board units 3, the multiple vertical circuit boards 8V are fixed in a vertical position to a horizontal circuit board 8H at regular intervals or at intervals within a certain range. The board units 3 shown in Figures 5 and 10 have multiple (three in Figure 5) vertical circuit boards 8V as discharge circuit boards 8D and one vertical circuit board 8V as a control circuit board 8S. In the board units 3, the vertical circuit boards 8V are connected to both sides of the horizontal circuit board 8H, forming a rectangular tube shape. Furthermore, the board units 3 shown in Figures 10 and 12 have an intermediate vertical circuit board 8V between the vertical circuit boards 8V on both sides, and a cooling duct 13 extending vertically is provided between adjacent vertical circuit boards 8V.

[0031] In the board unit 3 shown in Figure 8, the discharge circuit board 8D is composed of three vertical circuit boards 8V, and one vertical circuit board 8V is composed of a control circuit board 8S. In the board unit 3, the discharge circuit boards 8D and the control circuit board 8S are connected to each other via an L-shaped bus bar 9C and a wiring pattern provided on the bottom plate circuit board 8HS. Although not shown, the control circuit board 8S is connected to each of the charging circuit boards 8C and the discharging circuit board 8D via communication lines. The control circuit board 8S controls the charging circuit board 8C and the discharging circuit board 8D via the communication lines to control the charging and discharging current of the battery unit 2. The horizontal circuit board 8H in Fig. 12 etc. is made up of a top plate circuit board 8HS and a bottom plate circuit board 8HS, with the top plate circuit board 8HT being the charging circuit board 8C, and the top plate circuit board 8HT and the bottom plate circuit board 8HS being connected to the lower and upper edges of each vertical circuit board 8V via L-shaped bus bars 9C and L-shaped metal fittings 91. The bottom plate circuit board 8HS in Fig. 12 etc. is mechanically and electrically connected and coupled to the vertical circuit board 8V via the L-shaped bus bars 9C, and the top plate circuit board 8HT is mechanically connected and coupled to the vertical circuit board 8V via the L-shaped metal fittings 9I.

[0032] Heat-generating components are surface-mounted on the discharge circuit board 8D, the control circuit board 8S, and the charge circuit board 8C. The discharge circuit board 8D is equipped with a discharge circuit that supplies power to the load. The discharge circuit is equipped with a constant voltage circuit that stabilizes and outputs the voltage of the battery unit 2. The constant voltage circuit uses a DC / DC converter that efficiently stabilizes and outputs the output. The DC / DC converter has a circuit configuration that includes heat-generating components such as semiconductor switching elements. The charge circuit board 8C is equipped with a charging circuit through which the charging current of the battery unit 2 flows. The heat-generating components in the charging circuit are the semiconductor switching elements that control the charging current. The DC / DC converter in the discharge circuit generates heat due to Joule heat from the current flowing through the semiconductor switching elements that stabilize and supply power to the load. The charge circuit generates heat due to Joule heat from the charging current. The control circuit is connected to and controls the discharge circuit and charge circuit, and includes heat-generating components.

[0033] The multiple vertical circuit boards 8V are arranged in a vertical position with cooling ducts 13 provided between adjacent circuit boards 8. The vertical circuit boards 8V have heat sinks 14 for the surface-mounted heat-generating components arranged in the cooling ducts 13, allowing the heat-generating components to be efficiently cooled by the air rising through the cooling ducts 13. The heat-generating components in the discharge circuit and control circuit include not only semiconductor switching elements but also semiconductor elements such as diodes through which discharge current and charge current flow. In the DC / DC converter of the discharge circuit, heat-generating components may also include transformers and choke coils that smooth pulsating current into smooth direct current.

[0034] The maximum output of the board unit 3 is determined by the output supplied to the load, and the charging current of the battery unit 2 is set to an optimal current value for charging the battery. The board unit 3 shown in the block diagram of Figure 5 has multiple discharge circuit boards 8D connected in parallel. This board unit 3 has the advantage that the total output of the board unit 3 can be increased by reducing the output of each discharge circuit board 8D. Furthermore, even if one of the discharge circuit boards 8D fails, power can be supplied to the load from the discharge circuit board 8D that is operating normally. The maximum output of the power supply device 1, i.e., the total output of the board unit 3, is set to an optimal output for the application. However, power supplies used, for example, as backup power sources for servers, are required to stably supply large amounts of power to the load in place of the commercial power source during a commercial power outage, in the short time it takes for the emergency power source, which drives a generator using an engine, to start up. Although the backup power source only supplies power to the load for a short time during a power outage, the supplied power is quite large, so the total output of the discharge circuit boards 8D is set to a large value. The output of the charging circuit can be made significantly smaller than the output of the discharging circuit because the charging circuit board 8C can take a long time to charge the battery unit 2. The board unit 3 can increase its total output by connecting multiple discharging circuit boards 8D in parallel.

[0035] A high-efficiency DC / DC converter is suitable for the constant voltage circuit of the discharge circuit board 8D, which controls the output voltage to a constant voltage. Therefore, DC / DC converters with high power efficiency are almost always used for constant voltage circuits. DC / DC converters used in discharge circuits require high reliability to stably supply power to the load. High-reliability DC / DC converters increase component costs and their external dimensions as their maximum output increases. The DC / DC converter controls the duty cycle of semiconductor switching elements to maintain a constant voltage input from the battery unit 2 and output the constant voltage. Therefore, semiconductor switching elements such as power MOSFETs are used for the semiconductor switching elements. The semiconductor switching elements, such as power MOSFETs, convert the DC input from the battery unit 2 to rectangular-wave AC and supply the converted AC to a transformer. The transformer adjusts the voltage of the input AC to output rectangular-wave AC. The rectangular-wave AC output from the transformer is rectified by diodes and converted to smooth, pulsating DC by a smoothing circuit consisting of a choke coil and a smoothing capacitor.

[0036] DC / DC converters with the above circuit configurations require the use of high-output power MOSFETs and other elements to increase maximum output. Furthermore, because load current flows through semiconductor elements such as power MOSFETs and diodes in DC / DC converters, these elements become heat-generating components. In addition to semiconductor switching elements such as power MOSFETs, the heat-generating components of DC / DC converters also include transformers that adjust the output voltage, diodes that rectify the transformer output, and choke coils that smooth the pulsating current rectified by the diodes. These heat-generating components of DC / DC converters increase in size in accordance with the DC / DC converter's maximum output, which increases component costs. Furthermore, the increased heat energy generated requires excellent heat dissipation characteristics. The above DC / DC converters can be made smaller, reducing component costs and dissipating heat energy by reducing maximum output.

[0037] In principle, the maximum output of each discharge circuit board 8D of N parallel-connected discharge circuits can be set to 1 / N of the total output of the power supply device 1, but it is preferably set to 1.3 to 2 times the 1 / N maximum output. By setting the maximum output of each discharge circuit greater than 1 / N, the total output can be N times greater without controlling the output to a perfectly balanced state. Multiple parallel-connected discharge circuits can equalize the output current of each discharge circuit by using the constant voltage / constant current circuits of all discharge circuits as constant voltage / constant current circuits that limit the maximum output current. However, this discharge circuit requires extremely high precision in the constant voltage / constant current circuits that control the output current, resulting in a complex circuit configuration and high component costs due to the need for high-precision components. By setting the maximum output of each discharge circuit greater than 1 / N, the total output can be increased without perfectly balancing the output current of each discharge circuit.

[0038] Furthermore, the power supply device 1, which has multiple discharge circuits connected in parallel, can achieve extremely high reliability as a circuit configuration that can supply power to the load from other discharge circuit boards 8D that are not malfunctioning in the event that one of the discharge circuit boards 8D fails.

[0039] The board unit 3 of Figure 5 connects three discharge circuit boards 8D in parallel, thereby reducing the maximum output of the DC / DC converter mounted on each discharge circuit board 8D, thereby reducing the component cost of the DC / DC converter and the heat generation energy. In the board unit 3 of Figure 5, for example, the total output of the parallel-connected discharge circuits is set to 5.5 kW, and the maximum output of each discharge circuit is set to 3 kW. In the event that one discharge circuit fails, this power supply device 1 can output a rated output of 5.5 kW, with the output from the two discharge circuits set to 6 kW. This power supply device 1 has the advantage of being able to stably supply power to the load without a reduction in rated output even in the event that one discharge circuit fails.

[0040] A high-output power supply device 1 having many secondary batteries 6 connected in series and parallel is used for backup power supplies for servers, buildings, factories, etc., as power storage for peak cutting, or for power drive, so it is particularly effective to be able to increase the maximum output by connecting multiple discharge circuit boards 8D in parallel (Circuit board 8 connection structure).

[0041] 8 to 16, the horizontal circuit board 8H is composed of a bottom-plate circuit board 8HS and a top-plate circuit board 8HT, and the vertical circuit board 8V is composed of a plurality of circuit boards 8, with the top-plate circuit board 8HT and the bottom-plate circuit board 8HS being connected by the plurality of vertical circuit boards 8V. The vertical circuit boards 8V and the horizontal circuit boards 8H are connected at right angles by an L-shaped bus bar 9C and an L-shaped metal fitting 9I of the detachable connecting portion 9. The L-shaped bus bar 9C electrically connects and fixes the vertical circuit board 8V and the horizontal circuit board 8H, while the L-shaped metal fitting 9I fixes the vertical circuit board 8V and the horizontal circuit board 8H without electrically connecting them.

[0042] The L-shaped bus bar 9C and the L-shaped metal fitting 9I are formed by bending a thick metal plate into an L-shape to form a pair of bent pieces 10. One of the pair of bent pieces 10 is a vertical piece 10V, and the other is a horizontal piece 10H. Female threaded holes are provided in the horizontal piece 10H and the vertical piece 10V. The L-shaped bus bar 9C with the female threaded holes can be secured to the horizontal circuit board 8H by threading a set screw 12 into the female threaded hole and sandwiching it between the horizontal piece 10H and the head of the set screw 12 without using a nut. The L-shaped bus bar 9C with the female threaded holes is manufactured from thick metal plate, for example, with a thickness of 1 mm or more, preferably 1.5 mm or more, and more preferably approximately 2 mm, since the horizontal piece 10H and the vertical piece 10V are made of thick metal plate, allowing for a strong fastening of the set screw 12. The L-shaped bus bar 9C is manufactured from metal plate, with the horizontal piece 10H and the vertical piece 10V preferably having a width and length of 5 mm or more. The set screw 12 may be a thick screw, for example, M2 or larger, preferably about M3.

[0043] As shown in Fig. 17 , the L-shaped bus bar 9C and the L-shaped metal fitting 9I can also be fixed to the circuit board 8 by threading set screws 12 into nuts 15 arranged on the back surface of the circuit board 8. The L-shaped bus bar 9C can be fixed by inserting set screws 12 into through holes having an inner diameter larger than the outer diameter of the threaded portions of the set screws 12 and threading them into the nuts 15 on the back surface of the circuit board 8. Note that Fig. 17 and other figures disclose a configuration in which nuts 15 are used for fixing, but the through holes of the L-shaped bus bar 9C and the L-shaped metal fitting 9I may be configured to be tapped, and the set screws 12 may be directly threaded into the L-shaped bus bar 9C and the L-shaped metal fitting 9I for fixing without using nuts 15.

[0044] The vertical circuit board 8V and the horizontal circuit board 8H, which are connected by the L-shaped bus bar 9C and the L-shaped metal fittings 9I, are connected at a right angle and firmly fixed. The horizontal piece 10H and the vertical piece 10V of the L-shaped bus bar 9C are electrically connected to the conductive terminals 11 provided on the surface of the circuit board 8, thereby electrically connecting the vertical circuit board 8V and the horizontal circuit board 8H. The electrical connection between the L-shaped bus bar 9C and the circuit board 8 does not necessarily have to be made by stacking the bent pieces 10 on the conductive terminals 11 provided on the surface of the circuit board 8. For example, the conductive terminals 11 can be provided on the back surface of the circuit board 8, the heads of the set screws 12 can be electrically connected to the conductive terminals 11, and the conductive terminals 11 can be electrically connected to the bent pieces 10 of the L-shaped bus bar 9C via the set screws 12 that are screwed into the bent pieces 10.

[0045] The bent piece 10 of the L-shaped metal fitting 9I is fixed at a right angle without being electrically connected to the circuit board 8, so it can be fixed to the circuit board 8 without being stacked on the conductive terminal portion 11 of the circuit board 8 shown in FIG. 17, or it can be stacked on and fixed to a conductive terminal portion 11 that is provided independently on the surface of the circuit board 8 without being connected to a wiring pattern.

[0046] The detachable connector 9 shown in Figure 15 secures a diagonal position of a vertical circuit board 8V to a horizontal circuit board 8H. The vertical circuit board 8V in this figure has its lower edge secured to the circuit board 8HS on the bottom plate by an L-shaped bus bar 9C and its upper edge secured to the circuit board 8HT on the top plate by an L-shaped bracket 9I, with the L-shaped bus bar 9C and the L-shaped bracket 9I disposed at diagonal positions of the vertical circuit board 8V. The L-shaped bus bar 9C secures one end of the lower edge of the vertical circuit board 8V (the right end in the figure) to the circuit board 8HS on the bottom plate, and the L-shaped bracket 9I secures the other end of the upper edge of the vertical circuit board 8V (the left end in the figure) to the circuit board 8HT on the top plate. As shown in this figure, the vertical circuit board 8V, which is secured at diagonal positions to the circuit board 8HS on the bottom plate and the circuit board 8HT on the top plate, has the advantage of being secured to the horizontal circuit board 8H while preventing overall deformation. Furthermore, the structure in which the middle portion of the vertical circuit board 8V is also fixed to the bottom plate circuit board 8HS with the L-shaped bus bar 9C has the advantage of more reliably preventing deformation of the entire vertical circuit board 8V and fixing it to the horizontal circuit board 8H.

[0047] Furthermore, because the L-shaped metal fittings 9I can be fixed to the vertical circuit board 8V without being electrically connected to it, the vertical circuit board 8V can be firmly and stably fixed to the horizontal circuit board 8H without having to consider the wiring pattern of the circuit board 8. Therefore, the vertical circuit board 8V can be firmly fixed to the horizontal circuit board 8H by arranging the corners of the vertical circuit board 8V at diagonal positions of the L-shaped bus bars 9C that fix the vertical circuit board 8V to the horizontal circuit board 8H.

[0048] A structure in which vertical circuit boards 8V are fixed to both sides of a horizontal circuit board 8H can connect four circuit boards 8, consisting of vertical circuit boards 8V located on both sides and horizontal circuit boards 8H located above and below, into a rectangular tube shape. A structure in which four circuit boards 8 are connected into a rectangular tube shape has strong bending strength in the vertical and vertical directions, suppresses deformation due to impact, and achieves excellent impact resistance. Furthermore, a structure in which an intermediate vertical circuit board 8V is placed between two vertical circuit boards 8V located on both sides has the vertical circuit board 8V placed inside the rectangular tube, further improving bending strength in the vertical direction and impact resistance. The board unit 3 shown in Figures 10 and 16 can be formed by connecting six circuit boards 8, consisting of four vertical circuit boards 8V and two horizontal circuit boards 8H, at right angles to form a rectangular tube structure in which two vertical circuit boards 8V are placed inside the rectangular tube. This structure has improved bending strength in the vertical direction due to the two vertical circuit boards 8V arranged inside, and the impact resistance strength is further improved.

[0049] The connection structure of the circuit board 8 affects the bending strength of the rectangular tube. A connection structure in which the horizontal piece 10H and vertical piece 10V of the L-shaped bus bar 9C are screwed to the surface of the circuit board 8 can firmly secure the vertical circuit board 8V and the horizontal circuit board 8H while maintaining a right-angle orientation. A connection structure using a connector, i.e., inserting the vertical circuit board 8V into a connector fixed to the horizontal circuit board 8H, can also be used to connect the two boards, but this connection structure does not firmly secure the vertical circuit board 8V and the horizontal circuit board 8H while maintaining a right-angle orientation. A connection structure in which the L-shaped bus bar 9C, made of an L-shaped metal plate that connects the horizontal piece 10H and the vertical piece 10V at a right angle, is screwed to the surface of the circuit board 8, allowing the horizontal piece 10H and vertical piece 10V of the strong L-shaped bus bar 9C to be screwed to the surface of the circuit board 8, maintaining the vertical circuit board 8V and the horizontal circuit board 8H in a right-angle orientation and providing extremely strong connection. The rectangular cylindrical shape of the circuit board 8 formed by connecting the circuit boards 8 with extremely high strength provides extremely high impact resistance.

[0050] Furthermore, in the board unit 3 shown in Figures 8, 9, 13, and 14, the circuit board 8HT on the top plate and the circuit board 8HS on the bottom plate are connected by a vertical connecting bar 16. The vertical connecting bar 16 is formed by bending the upper and lower ends of a metal plate to provide connecting pieces 17 that are fixed to the horizontal circuit board 8H. The vertical connecting bar 16 connects the upper and lower connecting pieces 17 to the circuit board 8HT on the top plate and the circuit board 8HS on the bottom plate with detachable set screws 12, connecting the circuit board 8HT on the top plate and the circuit board 8HS on the bottom plate without using the vertical circuit board 8V. The board unit 3 shown in Figures 13 and 14 improves vibration resistance by connecting one end of the circuit board 8HT on the top plate and one end of the circuit board 8HS on the bottom plate with the vertical connecting bar 16. Furthermore, the illustrated board unit 3 connects the other ends of the circuit board 8HT on the top plate and the circuit board 8HS on the bottom plate via detachable connecting portion 9 and vertical circuit board 8V, improving the vibration resistance strength of both ends of the board unit 3. The vertical connecting bar 16 can electrically connect the circuit board 8HT on the top plate and the circuit board 8HS on the bottom plate, or it can fix the circuit board 8HT on the top plate to the circuit board 8HS on the bottom plate without electrical connection.

[0051] The board unit 3 shown in Figures 12 to 16 has a metal bracket 18 fixed to the top surface of a circuit board 8HT on the top plate. The bracket 18 is made of a metal plate and has connecting portions 18b integrally formed therewith for fastening to the circuit board 8HT on the top plate. The bracket 18 includes a rectangular reinforcing plate 18a that covers almost the entire top surface of the circuit board 8HT on the top plate except for a portion of the periphery, and multiple connecting portions 18b are provided on the outer periphery of the reinforcing plate 18a. The bracket 18 shown in Figures 13 and 14 has multiple connecting portions 18b on both ends and both sides of the rectangular reinforcing plate 18a, with L-shaped legs extending from the reinforcing plate 18a toward the circuit board 8HT on the top plate (the lower side in the figures) to which it is connected and fixed. The bracket 18 is fastened to the circuit board 8HT on the top plate via these connecting portions 18b. The connecting leg 18b has a bent portion 18c at its lower end, and is fixed to the circuit board 8HT on the top plate with a set screw 18d that passes through the bent portion 18c. As shown in FIG. 15 and the partially enlarged cross-sectional perspective view, the board unit 3 fixes the bracket 18 to the exterior case 4, further improving vibration resistance. The bracket 18 has a recess 18e where it is fixed to the exterior case 4. The exterior case 4 has a protruding convex portion on the inside (the side of the recess 18e of the bracket 18) and a recessed, indented recess on the outside. The exterior case 4 has a recess that fits into the recess 18e of the bracket 18, and the top surface of the protruding portion is provided with a recess that guides the head of the set screw 18d. The bracket 18 and the exterior case 4 can be formed by pressing metal plate, each with a recess (protrusion) at the fitting position. The bracket 18 can be fixed to the outer case 4 with a set screw 18d that passes through a recess in the outer case 4; for example, a tapping screw can be screwed into the recess and fixed to the outer case 4 without the need for a nut or other female thread. The bracket 18 and the outer case 4 have mating recesses 18e on the bracket 18 and protrusions on the outer case 4 at multiple locations (four locations in Figures 14 and 15), allowing the bracket 18 to be firmly fixed in a fixed position on the outer case 4 without misalignment. Furthermore, the head of a tapping screw that is screwed into a recess in the outer case 4 to fix the bracket 18 can be guided into the recess in the outer case 4, allowing the bracket 18 to be fixed without protruding from the surface of the outer case 4.The structure for fixing the bracket 18 fixed to the circuit board 8HT on the top plate to the exterior case 4 reinforces the top surface of the board unit 3 with the bracket 18, and the bracket 18 reinforcing the board unit 3 is further fixed to the exterior case 4, thereby significantly improving the vibration resistance of the board unit 3. Furthermore, the board unit 3 shown in the cross-sectional perspective view of Figure 15 has the circuit board 8HS on the bottom plate fixed to the bottom surface of the exterior case 4. With this structure, the board unit 3 fixes the circuit board 8HT on the top plate to the exterior case 4 via the bracket 18, and the unique structure for fixing the circuit board 8HS on the bottom plate to the exterior case 4 also allows the circuit board 8HT on the top plate and the circuit board 8HS on the bottom plate to be firmly fixed in position on the exterior case 4. The structure for fixing multiple vertical circuit boards 8V to the circuit board 8HT on the top plate and the circuit board 8HS on the bottom plate that are firmly fixed to the exterior case 4 significantly improves the vibration resistance of the board unit 3, i.e., the stability and reliability of the power supply device 1. (Embodiment 2).

[0052] The power supply device 1 of the present disclosure does not specify whether the circuit boards 8 of the vertical circuit board 8V and the horizontal circuit board 8H are a discharging circuit board 8D, a charging circuit board 8C, or a control circuit board 8S. In the power supply device 1 of embodiment 2, as a configuration other than that of embodiment 1, the vertical circuit board 8V and the horizontal circuit board 8H can be one or more discharging circuit boards 8D, charging circuit boards 8C, and control circuit boards 8S, or a combination of these. The vertical circuit board 8V can have one or more discharging circuit boards 8D, charging circuit boards 8C, and control circuit boards 8S, or a combination thereof. The circuit board 8HT on the top plate and / or the circuit board 8HS on the bottom plate of the horizontal circuit board 8H can have one or more discharging circuit boards 8D, charging circuit boards 8C, and control circuit boards 8S.

[0053] The power supply device with replaceable circuit boards described above can be effectively used as a highly reliable power supply device in which a specific circuit board can be replaced.

[0054] DESCRIPTION OF SYMBOLS 1...Power supply device 2...Battery unit 3...Board unit 4...External case 5...Output terminal 6...Secondary battery 7...Lead plate 8...Circuit board 8H...Horizontal circuit board 8HT...Top plate circuit board 8HS...Bottom plate circuit board 8V...Vertical circuit board 8D...Discharge circuit board 8S...Control circuit board 8C...Charge circuit board 9...Detachable connecting part 9C...L-shaped bus bar 9I...L-shaped metal fitting 10...Bent piece 10H...Horizontal piece 10V...Vertical piece 11...Conductive terminal part 12...Set screw 13...Cooling duct 14...Heat sink 15...Nut 16...Vertical connecting bar 17...Connecting piece 18...Bracket 18a...Reinforcing plate 18b...Connecting leg, connecting part 18c...Bent part 18d...Set screw 18e...Recess

Claims

1. A power supply device comprising: a battery unit having a plurality of secondary batteries; and a board unit consisting of a plurality of circuit boards connected to the battery unit, wherein the board unit comprises all of the following configurations (a) to (g): (a) The board unit comprises a horizontal circuit board arranged in a horizontal position, and a plurality of vertical circuit boards fixed perpendicularly to the horizontal circuit board. (b) The board unit comprises a detachable coupling part that detachably couples the horizontal circuit board and the vertical circuit board. (c) The detachable coupling part comprises an L-shaped bus bar made of an L-shaped metal plate, and a set screw that detachably couples the L-shaped bus bar to the circuit board. (d) The L-shaped bus bar is a conductive metal plate formed by connecting a pair of bent pieces in an L shape. (e) The L-shaped bus bar has one bent piece fixed to the surface of the vertical circuit board and the other bent piece fixed to the surface of the horizontal circuit board, connecting the vertical circuit board and the horizontal circuit board at a right angle. (f) The circuit board connected to the L-shaped bus bar has conductive terminal portions formed by stacking and electrically connecting the bent pieces of the L-shaped bus bar. (g) The set screws pass through the circuit board to fix the L-shaped bus bar to the circuit board and electrically connect the bent pieces of the L-shaped bus bar to the conductive terminal portions of the circuit board.

2. A power supply device according to claim 1, wherein the board unit comprises a discharge circuit board on which a constant voltage circuit that controls the output voltage of the battery unit is mounted, a charge circuit board on which a charge circuit that controls the charging of the battery unit is mounted, and a control circuit board connected to the discharge circuit board and the charge circuit board.

3. A power supply device as claimed in claim 1, wherein the detachable connecting section further comprises an L-shaped metal fitting that connects the vertical circuit board and the horizontal circuit board without electrically connecting them, the horizontal circuit board comprising a circuit board on a bottom plate and a circuit board on a top plate, the circuit board on the bottom plate being connected to the lower edge of the vertical circuit board via the L-shaped bus bar, and the circuit board on the top plate being connected to the upper end of the vertical circuit board via the L-shaped metal fitting, and the circuit board on the bottom plate and the circuit board on the top plate being connected via a plurality of the vertical circuit boards.

4. A power supply device according to claim 1, wherein a plurality of said vertical circuit boards are connected to both sides of said horizontal circuit board via said L-shaped bus bar.

5. A power supply device according to claim 1, wherein the board unit comprises a discharge circuit board on which a constant voltage circuit that controls the output voltage of the battery unit is mounted, a charge circuit board on which a charge circuit that controls the charging of the battery unit is mounted, and a control circuit board connected to the discharge circuit board and the charge circuit board, wherein the discharge circuit board and the control circuit board are the vertical circuit boards and the charge circuit board is the horizontal circuit board.

6. A power supply device according to claim 1, wherein the board unit comprises a discharge circuit board mounting a constant voltage circuit that controls the output voltage of the battery unit, a charging circuit board mounting a charging circuit that controls the charging of the battery unit, and a control circuit board connected to the discharge circuit board and the charging circuit board, wherein the discharge circuit board and the control circuit board are the vertical circuit boards, and the charging circuit board is the horizontal circuit board, and a plurality of the vertical circuit boards are connected to the horizontal circuit board by providing cooling ducts extending in the vertical direction between adjacent vertical circuit boards, and the discharge circuit board has heat-generating components thermally coupled to a radiator on its surface, and the radiator is disposed in the cooling duct.

7. A power supply device according to claim 6, wherein the discharge circuit board is provided with the constant voltage circuit consisting of a DC / DC converter that stabilizes and outputs the output voltage of the battery unit, and the heat-generating component is a semiconductor switching element of the DC / DC converter.

8. A power supply device according to claim 1, wherein the board unit comprises a discharge circuit board on which a constant voltage circuit that controls the output voltage of the battery unit is mounted, a charging circuit board on which a charging circuit that controls the charging of the battery unit is mounted, and a control circuit board connected to the discharge circuit board and the charging circuit board, wherein the discharge circuit board and the control circuit board are the vertical circuit boards, the charging circuit board is the horizontal circuit board, and a plurality of the vertical circuit boards are connected in parallel via the L-shaped bus bar and the horizontal circuit board.

9. A power supply device as claimed in claim 1, wherein the horizontal circuit board comprises a circuit board on a top plate and a circuit board on a bottom plate, the detachable connecting portion further comprises an L-shaped metal fitting that connects the vertical circuit board and the horizontal circuit board without electrically connecting them, the L-shaped bus bar and the L-shaped metal fitting are arranged in diagonal positions on the vertical circuit board, and the L-shaped bus bar and the L-shaped metal fitting that are arranged in diagonal positions connect the vertical circuit board to the circuit board on the bottom plate and the circuit board on the top plate.

10. A power supply device as claimed in any one of claims 1 to 9, wherein the horizontal circuit board comprises a circuit board on a top plate and a circuit board on a bottom plate, the board unit comprises a vertical connecting bar connecting the circuit board on the top plate and the circuit board on the bottom plate, and the vertical connecting bar is detachably connected to the circuit board on the top plate and the circuit board on the bottom plate.

11. A power supply device as claimed in claim 1, wherein the horizontal circuit board comprises a circuit board on a top plate and a circuit board on a bottom plate, the board unit comprises a vertical connecting bar connecting the circuit board on the top plate and the circuit board on the bottom plate, and the vertical connecting bar connects the ends of the circuit board on the top plate and the circuit board on the bottom plate.

12. A power supply device as claimed in claim 1, wherein the horizontal circuit board comprises a circuit board on a top plate and a circuit board on a bottom plate, the board unit comprises a vertical connecting bar connecting the circuit board on the top plate and the circuit board on the bottom plate, the detachable connecting portion further comprises an L-shaped metal fitting connecting the vertical circuit board and the circuit board on the top plate without electrically connecting them, and the upper end of the vertical connecting bar is connected to the end opposite the connecting portion between the vertical circuit board and the circuit board on the top plate by the L-shaped metal fitting.

13. A power supply device as claimed in claim 1, wherein the horizontal circuit board comprises a circuit board on a top plate and a circuit board on a bottom plate, the board unit comprises a metal plate bracket fixed to the upper surface of the circuit board on the top plate, and the board unit fixes the circuit board on the top plate to an outer case via the bracket, and the circuit board on the bottom plate is fixed to the outer case.

14. The power supply device according to claim 1, wherein a plurality of power supply devices are connected in parallel to form a backup power supply that supplies power to a load in the event of a power outage.

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