Power supply device and method for manufacturing the same

Abstract

The present invention makes it possible to avoid unintentional damage at the time of assembly of a power supply device and enhance workability.　Provided is a method for producing a power supply device comprising a plurality of secondary battery cells (1) each having electrode terminals, a battery holder (10) for holding the plurality of secondary battery cells (1), and a circuit board electrically connected with the plurality of secondary battery cells (1) and having a control circuit for controlling charging / discharging mounted thereon, wherein the method for producing a power supply device includes: a step in which a battery-side ground terminal (30) led out to the exterior from the battery holder (10) and serving as a ground side for the total output resulting from electrically connecting the plurality of secondary battery cells (1) in series and / or in parallel is connected with a board-side ground terminal provided to the circuit board; and a step in which the circuit board is placed on one surface of the battery holder (10) and one or more battery-side intermediate terminals (21) that are provided to the battery holder (10) and electrically connected with at least one of the plurality of secondary battery cells (1) are individually connected with one or more board-side intermediate terminals provided to the circuit board.

Description

[Technical Field]

[0001] The present invention relates to a power supply device and a method for manufacturing the same. [Background technology]

[0002] Power supply devices with multiple secondary battery cells connected in series and parallel are used as backup power sources for servers, as stationary power storage devices for homes, offices, and factories, and as power sources for driving vehicles such as hybrid cars, electric vehicles, electric carts, and electric scooters, as well as for power-assisted bicycles and power tools. These power supply devices achieve high output by connecting multiple secondary battery cells in series. For example, the power supply device 600 shown in the exploded perspective view of FIG. 6 includes a battery holder 610 that holds multiple secondary battery cells 601 and a circuit board 640 that mounts a control circuit for controlling the charging and discharging of the secondary battery cells 601. An IC chip such as an AFE is mounted on the circuit board 640. The battery holder 610 and the circuit board 640 are electrically connected via lead plates or the like.

[0003] When assembling such a power supply device, if the circuit ground is floating and unstable when connecting the circuit board and battery holder with lead plates or other devices, high voltage may be applied to the circuit, destroying ICs and other devices, applying overvoltage to unintended circuits, or allowing rush current to flow through unintended paths, potentially causing circuit malfunction or destruction. In particular, when connecting multiple locations with lead plates or other devices, the voltage applied to the circuit varies depending on which lead plate is connected first. Therefore, if the connection order is incorrect, a high voltage may be temporarily applied to the circuit, potentially destroying the devices. To prevent this, it is possible to connect the low-potential side of the circuit to the low-potential side of the battery holder.

[0004] However, since the circuit board 640 is generally flat as shown in Figure 6 and has a structure in which electrical connection patterns and lead plates are fixed to its surface, simply placing it on the battery holder 610 makes it uncertain which of the multiple connection points will come into contact first and become conductive, and even if you try to connect the low-potential side first, other parts may unintentionally come into contact, making the process cumbersome. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-243426 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a power supply device and a method for manufacturing the same that can prevent unintended damage during assembly and improve workability.

[0007] In order to achieve the above object, a manufacturing method of a power supply device according to a first aspect of the present invention is a manufacturing method of a power supply device including a plurality of secondary battery cells each having an electrode terminal, a battery holder for holding the plurality of secondary battery cells, and a circuit board mounted with a control circuit electrically connected to the plurality of secondary battery cells and controlling charging and discharging, the manufacturing method including the steps of: connecting a battery-side ground terminal extending from the battery holder to a board-side ground terminal provided on the circuit board, the battery-side ground terminal being the ground side of a total output of the plurality of secondary battery cells electrically connected in series and / or parallel, and placing the circuit board on one side of the battery holder and connecting one or more battery-side intermediate terminals provided on the battery holder and electrically connected to at least one of the plurality of secondary battery cells to one or more board-side intermediate terminals provided on the circuit board. This allows the battery-side ground terminal extending from the battery holder to be connected to the board-side ground terminal first during assembly of the power supply device, thereby avoiding damage that would occur if the battery-side intermediate terminal and the board-side intermediate terminal were to first establish electrical conduction, thereby improving reliability during assembly.

[0008] In a second embodiment of the present invention, the step of connecting the battery-side ground terminal to the board-side ground terminal is a step of connecting the battery-side ground terminal, which is drawn out from the battery holder via a flexible member, to the board-side ground terminal, thereby improving the ease of handling of the drawn-out battery-side ground terminal and providing the advantage of being able to quickly perform the connection work prior to the connection work of other connection terminals.

[0009] Furthermore, a third aspect of the present invention provides a power supply device comprising: a plurality of secondary battery cells each having an electrode terminal; a battery holder for holding the plurality of secondary battery cells; and a circuit board mounted on one surface of the battery holder, wherein the battery holder comprises one or more battery-side intermediate terminals electrically connected to at least one of the plurality of secondary battery cells; and a battery-side ground terminal extending from the battery holder to the outside and serving as a ground for a total output of the plurality of secondary battery cells electrically connected in series and / or parallel, and the circuit board comprises one or more board-side intermediate terminals connecting to the one or more battery-side intermediate terminals and a board-side ground terminal connecting to the battery-side ground terminal. This configuration allows the battery-side ground terminal extended from the battery holder to be connected to the board-side ground terminal first during assembly of the power supply device, thereby avoiding damage that would occur if the battery-side intermediate terminal and the board-side intermediate terminal were to become electrically conductive first, thereby improving reliability during assembly.

[0010] Furthermore, in the power supply device according to a fourth aspect of the present invention, in the above configuration, the battery ground terminal is drawn out from the battery holder via a flexible member, which improves the ease of handling of the drawn-out battery ground terminal and provides the advantage of enabling quick connection work to be performed prior to connection work of other connection terminals.

[0011] Furthermore, in a power supply device according to a fifth aspect of the present invention, in any of the above configurations, the board-side intermediate terminals include lug terminals provided on the side of the circuit board facing the battery holder at positions corresponding to the battery-side intermediate terminals, and the circuit board is placed on one side of the battery holder to connect the lug terminals to the battery-side intermediate terminals. With this configuration, the lug terminals can be connected to the battery-side intermediate terminals by placing the circuit board. In particular, by connecting the battery-side ground terminal to the board-side ground terminal before placing the circuit board, random connection between the lug terminals and the battery-side intermediate terminals can be achieved.

[0012] Furthermore, in a power supply device according to a sixth aspect of the present invention, in any of the above configurations, the battery holder includes a plurality of lead plates that electrically connect the electrode terminals of adjacent secondary battery cells among the plurality of secondary battery cells, and among the plurality of lead plates, the lead plate that electrically connects the plurality of secondary battery cells in series and / or parallel and that is on the ground side of the total output is a ground lead plate, and a battery-side ground terminal is connected to the ground lead plate.

[0013] Furthermore, in a power supply device according to a seventh aspect of the present invention, in any of the above configurations, the flexible member is a lead wire, one end of which is pre-connected to the battery-side ground terminal and the other end of which is a free end connectable to the ground lead plate. With this configuration, the battery-side ground terminal, which is drawn out from the battery holder by the flexible lead wire, can be easily connected to the board-side ground terminal.

[0014] Furthermore, in a power supply device according to an eighth embodiment of the present invention, in any of the above configurations, the battery side ground terminal includes a battery side connector provided at the other end of the lead wire that connects to the board side ground terminal, and the board side ground terminal includes a board side connector that is connected to the battery side connector.

[0015] Furthermore, in a power supply device according to a ninth aspect of the present invention, in any of the above configurations, the battery holder has a plurality of lead plates that electrically connect electrode terminals of adjacent secondary battery cells among the plurality of secondary battery cells, and the battery side intermediate terminal is formed on some of the plurality of lead plates.

[0016] Furthermore, in a power supply device according to a tenth aspect of the present invention, in any of the above configurations, the circuit board is formed in a rectangular shape, and the board-side ground terminal is provided on an edge of the rectangular shape. This configuration makes it easy to connect the battery-side ground terminal to the board-side ground terminal provided on the edge of the circuit board.

[0017] Furthermore, according to an eleventh aspect of the present invention, there is provided a power supply device comprising: a plurality of secondary battery cells each having an electrode terminal; a battery holder for holding the plurality of secondary battery cells; and a circuit board mounted on one surface of the battery holder, wherein the battery holder comprises one or more battery-side intermediate terminals electrically connected to at least one of the plurality of secondary battery cells and a battery-side ground terminal serving as a ground for a total output of the plurality of secondary battery cells electrically connected in series and / or parallel, and the circuit board comprises one or more board-side intermediate terminals connected to the one or more battery-side intermediate terminals, and a board-side ground terminal extending from the circuit board to connect to the battery-side ground terminal. This configuration makes it possible to connect the board-side ground terminal extending from the circuit board to the battery-side ground terminal first during assembly of the power supply device, thereby avoiding damage that would occur if the battery-side intermediate terminal and the board-side intermediate terminal were to first establish electrical contact, thereby improving reliability during assembly.

[0018] Furthermore, in a power supply device according to a twelfth aspect of the present invention, in any of the above configurations, the battery-side ground terminal is provided with a battery-side connector, and the board-side ground terminal is provided with a board-side connector that engages with the battery-side connector. With the above configuration, by engaging the battery-side connector of the battery-side ground terminal with the board-side connector of the board-side ground terminal, the board-side ground is simply and reliably electrically connected to the battery-side ground, thereby achieving stabilization of the voltage of the circuit board. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is an exploded perspective view showing a power supply device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged plan view of a main part of the power supply device of FIG. [Figure 3] 2 is an exploded perspective view of the power supply device of FIG. 1 as seen from the rear side. [Figure 4] FIG. 2 is a bottom view of the circuit board of FIG. [Figure 5] FIG. 10 is an exploded perspective view showing a power supply device according to a second embodiment. [Figure 6]FIG. 10 is an exploded perspective view showing a conventional power supply device. DETAILED DESCRIPTION OF THE INVENTION

[0020] Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are merely examples for embodying the technical concept of the present invention, and the present invention is not limited to these. Furthermore, this specification in no way specifies the components set forth in the claims as components of the embodiments. The dimensions, materials, shapes, and relative positions of components described in the embodiments are not intended to limit the scope of the present invention, and are merely illustrative unless otherwise specified. The size and relative positions of components shown in the drawings may be exaggerated for clarity. Furthermore, in the following description, the same names and symbols indicate identical or similar components, and detailed descriptions will be omitted as appropriate. Furthermore, the elements constituting the present invention may be configured with the same components, so that one component serves multiple functions, or conversely, the function of one component may be shared by multiple components.

[0021] The power supply device of the present invention can be used for a variety of purposes, such as a backup power supply for servers, a power supply mounted on electric vehicles such as hybrid cars and electric automobiles to supply power to the drive motor, a power supply for storing power generated by natural energy sources such as solar power and wind power, or a power supply for storing late-night power, and is particularly suitable for use in large power and large current applications. Below, we will explain a power supply device used as a backup power supply for a server as one embodiment of the present invention. [Embodiment 1]

[0022] A power supply device 100 according to a first embodiment of the present invention is shown in an exploded perspective view in Figure 1. The power supply device 100 shown in this figure includes a battery holder 10 and a circuit board 40 mounted on one surface of the battery holder 10. The battery holder 10 holds multiple secondary battery cells 1. (Secondary battery cell 1)

[0023] Each secondary battery cell 1 is a cylindrical secondary battery cell with a cylindrical outer can. The cylindrical secondary battery cell 1 has electrode surfaces on both end faces. The multiple secondary battery cells 1 are connected at least in series. Preferably, the series-connected secondary battery cells 1 are further connected in parallel. The output of a battery assembly composed of secondary battery cells 1 including those connected in series is output from a power supply device 100. The secondary battery cells 1 are cylindrical lithium-ion secondary batteries. However, the power supply device of the present invention does not limit the secondary battery cells to cylindrical batteries or lithium-ion secondary batteries. Any rechargeable battery, such as nickel-metal hydride battery cells, can be used as the battery cells. (Battery holder 10)

[0024] The battery holder 10 is a component for holding multiple secondary battery cells 1. This battery holder 10 forms a cylindrical battery holding section into which cylindrical secondary battery cells 1 can be inserted. The battery holder 10 in Figure 1 has two battery holding sections, with the cylindrical centers of the upper and lower battery holding sections offset from each other to reduce the overall thickness. This battery holder 10 is made of a material with excellent insulating and heat-resistant properties, such as polycarbonate ABC resin.

[0025] The battery holder 10 is divided into multiple sub-holders that sandwich the rechargeable battery cell 1 from both sides. The middle portion of the rechargeable battery cell 1 is exposed from the sub-holders. With the rechargeable battery cell 1 sandwiched between the sub-holders, lead plates 20 are fixed to the side of the battery holder 10, and the rechargeable battery cell 1 and the lead plates 20 are welded together. Lead positioning guides that follow the outline of the lead plates 20 are formed on the side of the battery holder 10 to position the lead plates 20 in a predetermined position.

[0026] The battery holder 10 also includes multiple lead plates 20 and a battery-side ground terminal 30. The multiple lead plates 20 include a battery-side intermediate terminal 21. The battery-side intermediate terminal 21 is electrically connected to at least one of the multiple secondary battery cells 1. (Lead plate 20)

[0027] Each lead plate 20 is arranged on a side surface of the battery holder 10 and is connected to the electrode surfaces of multiple secondary battery cells 1. The lead plates 20 are used to connect multiple secondary battery cells 1 in series and parallel. In particular, when using high-capacity secondary battery cells 1 such as lithium-ion secondary batteries, the state of each secondary battery cell 1 can be determined by detecting the potential of each lead plate 20, thereby determining the voltage of the assembly of secondary battery cells 1 connected in parallel to this lead plate 20. In this example, six secondary battery cells 1 are connected in parallel, and seven sets of these are connected in series, resulting in a battery assembly consisting of a total of 42 secondary battery cells 1.

[0028] The multiple lead plates 20 electrically connect the electrode terminals of adjacent secondary battery cells 1. Of the multiple lead plates 20, the lead plate that electrically connects the multiple secondary battery cells 1 in series and / or parallel and serves as the ground side of the total output is designated as a ground lead plate 20G, and a battery-side ground terminal 30 is connected to this ground lead plate 20G.

[0029] The battery-side ground terminal 30 is connected to the ground side of the total output of the multiple secondary battery cells 1 electrically connected in series and / or parallel. This battery-side ground terminal 30 is drawn out from the battery holder 10.

[0030] Furthermore, the upper surface of the battery holder 10 serves as a mounting surface 11 on which a circuit board 40 is placed. A frame for holding the circuit board may be formed on the board mounting surface. Alternatively, a board holder for holding the circuit board may be provided separately. (circuit board 40)

[0031] The circuit board 40 is placed on the mounting surface 11. Electronic circuits mounted on the circuit board 40 include a voltage detection circuit that detects the intermediate potential of the battery assembly in which secondary battery cells 1 are connected in series or parallel, a control circuit that controls charging and discharging, and a safety circuit. The intermediate potential of the multiple secondary battery cells 1 connected in series that make up the battery assembly is detected from the potential of the lead plates 20 and input to the voltage detection circuit.

[0032] The circuit board 40 is formed in a rectangular shape. The circuit board 40 includes a board-side intermediate terminal 41 and a board-side ground terminal 46. The board-side intermediate terminal 41 is connected to one or more battery-side intermediate terminals 21. The board-side ground terminal 46 is connected to the battery-side ground terminal 30. This configuration makes it possible to first connect the battery-side ground terminal 30, which has been pulled out from the battery holder 10, to the board-side ground terminal 46 when assembling the power supply device 100. This prevents damage that would occur if the battery-side intermediate terminal 21 and the board-side intermediate terminal 41 were first electrically connected to each other, improving reliability during assembly.

[0033] When assembling a power supply device, it is necessary to electrically connect the circuit board and the battery holder. If the circuit board's ground is floating and in an unstable state when electrically connecting to the battery holder terminals, especially when rechargeable battery cells are connected in series and high voltage is generated, excessive voltage may be applied to unintended locations or rush current may flow through unintended paths, potentially causing circuit malfunction or destruction. When connecting multiple locations using lead plates, the voltage applied to the circuit varies depending on which lead plate is connected first. Therefore, if the connection order is incorrect, a high voltage may be temporarily applied to the circuit, potentially damaging the device. To prevent this, it is possible to electrically connect the circuit board and the battery holder in order from the lowest voltage to the highest. However, fixing the order in which lead plates are electrically connected forces the connection work during assembly to be performed in a specific order, reducing work efficiency and requiring time to connect all the locations. In recent years, random connection methods have emerged that allow for the order in which IC terminals are connected, and are popular for their increased flexibility in connection work. However, even with such randomly connectable ICs, it is only guaranteed that the connection order of the ICs themselves is not specified, and depending on the connection order of the circuit in which the ICs are implemented, there is still a risk that the elements may be damaged by the application of a transient high voltage or the inflow of an overcurrent.

[0034] In contrast, the power supply device 100 of this embodiment makes it easier to first reliably connect the ground of the circuit board 40 to the ground of the battery holder 10, thereby increasing stability, and then the circuit board 40 and battery holder 10 can be safely connected.

[0035] It is preferable that the board-side ground terminal 46 is provided on an edge of the rectangular shape of the circuit board 40. By arranging the board-side ground terminal 46 on the edge of the circuit board 40 in this way, it becomes easier to connect the drawn-out battery-side ground terminal 30. In the example of Fig. 1, the board-side ground terminal 46 is arranged on the longitudinal edge of the circuit board 40, which extends in one direction. (Battery side ground terminal 30)

[0036] As shown in Figure 2, it is preferable to extend the battery-side ground terminal 30 from the battery holder 10 to the outside via a flexible member. This improves the ease of handling of the extended battery-side ground terminal 30, and has the advantage of allowing for quick connection work prior to connecting other connection terminals. The flexible member can be, for example, a lead wire 31. One end of the lead wire 31 is pre-connected to the ground lead plate 20G. The other end of the lead wire 31 is a free end that can be connected to the ground lead plate 20G. This configuration makes it easy to connect the battery-side ground terminal 30, which is extended from the battery holder 10 via the flexible lead wire 31, to the board-side ground terminal 46.

[0037] In the example shown in FIG. 2 , one end of the lead wire 31 serves as a round terminal 32, which is screwed to the ground lead plate 20G. Here, the upper end of the ground lead plate 20G is bent into an L-shape and provided with a through-hole, into which the round terminal 32 is screwed. The other end, i.e., the tip side, of the lead wire 31 is provided with a battery-side connector 33. Meanwhile, the board-side ground terminal 46 is provided with a board-side connector 47 that engages with the battery-side connector 33. With this configuration, by engaging the battery-side connector 33 of the battery-side ground terminal 30 with the board-side connector 47 of the board-side ground terminal 46, the board-side ground is easily and reliably electrically connected to the battery-side ground, thereby stabilizing the voltage of the circuit board 40. Furthermore, by providing the board-side connector 47 in a corner of the circuit board 40 as shown in FIGS. 1 and 3 , an environment is realized in which the battery-side connector 33 can be easily connected to the board-side connector 47. (Holder side terminal 12)

[0038] The battery holder 10 has one or more holder-side terminals 12 connected to one or more battery-side intermediate terminals 21 on the side facing the circuit board 40. The holder-side terminals 12 may be formed by bending the battery-side intermediate terminals 21 provided on the lead plate 20. Meanwhile, as shown in FIG. 4, the circuit board 40 has lug terminals 42 mounted on the side facing the battery holder 10 at positions corresponding to the holder-side terminals 12. This configuration allows the lug terminals 42 to be connected to the holder-side terminals 12 simply by placing the circuit board 40. Specifically, before placing the circuit board 40, the battery-side ground terminal 30 is connected to the board-side ground terminal 46 in advance, as shown in FIG. 3. This stabilizes the voltage on the circuit board 40, ensuring safety, and allows random connection between the lug terminals 42 and the holder-side terminals 12. In this state, as shown in Figure 1 and elsewhere, the circuit board 40 is placed on the mounting surface 11 of the battery holder 10, aligning the lug terminals 42 and the holder-side terminals 12. This allows these electrical connections to be connected in any order, achieving a random connection. In other words, in a conventional system, as shown in Figure 6, depending on which part first contacts and establishes electrical continuity, there was a risk of damage, such as unintended overvoltage being applied to electronic components mounted on the circuit board. However, with the power supply device 100 of this embodiment, even when randomly connecting series-connected secondary battery cells 1 almost simultaneously, the board-side ground terminal 46 of the circuit board 40 can be reliably connected first and stabilized. This results in high safety and excellent yield. Furthermore, the lack of a prescribed connection order allows for flexible and efficient assembly. Note that Figure 3 shows the circuit board 40 tilted vertically to make the backside easier to see, but this does not necessarily mean that the circuit board 40 must be placed vertically on the mounting surface 11 of the battery holder 10.

[0039] Furthermore, the mounting surface 11 of the battery holder 10 or the circuit board 40 may be provided with a positioning mechanism to facilitate the connection of the lug terminals 42 and the holder-side terminals 12 in a positioned state. For example, a protrusion may be formed on the mounting surface 11, and the edge of the circuit board 40 may be pressed against this protrusion for positioning. Alternatively, recesses or holes may be formed in the circuit board 40, and locking pieces that can be inserted into these recesses or holes may be formed on the mounting surface 11. Furthermore, a fitting structure may be provided at the joint between the lug terminals 42 and the holder-side terminals 12, providing both a mechanical connection and a positioning function. [Manufacturing Method of Power Supply Device 100]

[0040] The power supply device 100 is assembled in the following procedure. First, the battery-side ground terminal 30, which extends from the battery holder 10 to the outside, is connected to the board-side ground terminal 46 provided on the circuit board 40. Next, the circuit board 40 is placed on the mounting surface 11 of the battery holder 10, and the battery-side intermediate terminal 21 is connected to the board-side intermediate terminal 41. In this way, when assembling the power supply device 100, the battery-side ground terminal 30, which extends from the battery holder 10 to the outside, can be easily connected first to the board-side ground terminal 46. This stabilizes the ground of the circuit board 40, and prevents damage that would occur if the battery-side intermediate terminal 21 and board-side intermediate terminal 41 were to first establish electrical continuity, improving reliability during assembly. [Embodiment 2]

[0041] In the above example, the battery-side ground terminal 30 is extended from the battery holder 10 and connected to the board-side ground terminal 46 of the circuit board 40. However, the present invention is not limited to this configuration, and any configuration that facilitates connection between the battery-side ground and the board-side ground may be used. For example, the board-side ground terminal may be extended from the circuit board and connected to the battery-side ground terminal. Such an example is shown in FIG. 5 as a power supply device according to a second embodiment. In the power supply device 200 shown in this figure, the same components as those in the power supply device 100 according to the first embodiment are designated by the same reference numerals and will not be described in detail. In the power supply device 200 shown in FIG. 5, the board-side ground terminal 46' is extended from the circuit board 40' via a lead wire 31'. The board-side ground terminal 46' is provided with a board-side connector 47'. Furthermore, the battery holder 10' has a battery-side ground terminal 30' provided at the edge of the battery holder 10'. The battery-side ground terminal 30' is provided with a battery-side connector 33'. By engaging the board-side connector 47' with this battery-side connector 33', it becomes possible to match the grounds on the battery side and the board side, and subsequent random connections can be realized in the same way as in the first embodiment. [Industrial Applicability]

[0042] The power supply device according to the present invention can be suitably used as a backup power supply device that can be mounted on the power supply module of a computer server, and can also be used as a backup power supply device for wireless base stations such as mobile phones, power sources for home and factory storage batteries, power sources for street lights, power storage devices combined with solar cells, backup power supplies for traffic lights, and power supplies for plug-in hybrid electric vehicles, hybrid electric vehicles, and electric vehicles that can switch between EV and HEV driving modes. [Explanation of symbols]

[0043] 100, 200, 600…power supply 1, 601... Secondary battery cell 10, 10', 610... Battery holder 11...Placement surface 12...Holder side terminal 20...Reed plate 20G...Ground lead plate 21...Battery side intermediate terminal 30, 30'...Battery side ground terminal 31, 31'...lead wire 32...Ring terminal 33, 33'...Battery side connector 40, 40', 640...circuit board 41...Board side intermediate terminal 42...Lug terminal 46, 46'...Board side ground terminal 47, 47'...Board side connector

Claims

1. a plurality of secondary battery cells each having an electrode terminal; a battery holder that holds the plurality of secondary battery cells; a circuit board on which a control circuit is mounted, the control circuit being electrically connected to the plurality of secondary battery cells and controlling charging and discharging; A method for manufacturing a power supply device comprising: a step of connecting a battery-side ground terminal, which is drawn out from the battery holder and serves as a ground side for a total output of the plurality of secondary battery cells electrically connected in series and / or parallel, to a board-side ground terminal provided on the circuit board; a step of connecting the battery-side ground terminal and the board-side ground terminal, and then placing the circuit board on one surface of the battery holder, and connecting one or more battery-side intermediate terminals provided on the battery holder and electrically connected to at least one of the plurality of secondary battery cells to one or more board-side intermediate terminals provided on the circuit board; A method for manufacturing a power supply device comprising:

2. A method for manufacturing the power supply device according to claim 1, A method for manufacturing a power supply device, wherein the step of connecting the battery-side ground terminal to the board-side ground terminal is a step of connecting the battery-side ground terminal, which is pulled out from the battery holder to the outside via a flexible member, to the board-side ground terminal.

3. a plurality of secondary battery cells each having an electrode terminal; a battery holder that holds the plurality of secondary battery cells; a circuit board placed on one surface of the battery holder; A power supply device comprising: The battery holder includes: one or more battery-side intermediate terminals electrically connected to at least one of the plurality of secondary battery cells; a battery-side ground terminal that is pulled out from the battery holder and serves as the ground side of a total output of the plurality of secondary battery cells electrically connected in series and / or parallel; Equipped with The circuit board includes: one or more board-side intermediate terminals connected to the one or more battery-side intermediate terminals; a substrate-side ground terminal connected to the battery-side ground terminal; A power supply device comprising:

4. 4. The power supply device according to claim 3, The power supply device has the battery-side ground terminal extended from the battery holder to the outside via a flexible member.

5. 5. The power supply device according to claim 4, the board-side intermediate terminal includes a lug terminal provided on the side of the circuit board facing the battery holder at a position corresponding to the battery-side intermediate terminal; The power supply device is configured such that the circuit board is placed on one surface of the battery holder and the lug terminal is connected to the battery-side intermediate terminal.

6. 6. The power supply device according to claim 4 or 5, the battery holder includes a plurality of lead plates that electrically connect electrode terminals of adjacent secondary battery cells among the plurality of secondary battery cells, Among the plurality of lead plates, a lead plate to which the plurality of secondary battery cells are electrically connected in series and / or parallel and which serves as a ground side of the total output is designated as a ground lead plate, The power supply device has the battery-side ground terminal connected to the ground lead plate.

7. 7. The power supply device according to claim 6, the flexible member is a lead wire, The lead wire is One end of the terminal is connected to the battery-side ground terminal in advance. The other end of the power supply device is a free end that can be connected to the ground lead plate.

8. 8. The power supply device according to claim 7, the battery-side ground terminal includes a battery-side connector provided at the other end of the lead wire that is connected to the board-side ground terminal; The power supply device includes a board-side connector, the board-side ground terminal being connected to the battery-side connector.

9. The power supply device according to any one of claims 6 to 8, the battery holder includes a plurality of lead plates that electrically connect electrode terminals of adjacent secondary battery cells among the plurality of secondary battery cells, The power supply device has the battery-side intermediate terminals formed on some of the lead plates.

10. The power supply device according to any one of claims 3 to 9, The circuit board is formed in a rectangular shape, The power supply device has the board-side ground terminal provided on an edge of the rectangular shape.

11. a plurality of secondary battery cells each having an electrode terminal; a battery holder that holds the plurality of secondary battery cells; a circuit board placed on one surface of the battery holder; A power supply device comprising: The battery holder includes: one or more battery-side intermediate terminals electrically connected to at least one of the plurality of secondary battery cells; a battery-side ground terminal that serves as the ground side of a total output when the plurality of secondary battery cells are electrically connected in series and / or parallel; Equipped with The circuit board includes: one or more board-side intermediate terminals connected to the one or more battery-side intermediate terminals; a board-side ground terminal that is drawn out from the circuit board and connects to the battery-side ground terminal; A power supply device comprising:

12. The power supply device according to any one of claims 3 to 11, the battery-side ground terminal includes a battery-side connector; The power supply device is provided with a board-side connector, the board-side ground terminal of which is engaged with the battery-side connector.

Images