Power supply device

Abstract

A power supply device is provided with: a plurality of battery blocks each provided with a plurality of secondary battery cells; and a plurality of bus bar plates that connect, among the plurality of battery blocks, any one of the plurality of secondary battery cells constituting one battery block to any one of the plurality of secondary battery cells constituting the other battery blocks. Each of the plurality of battery blocks is provided with a plurality of battery cells comprising a plurality of secondary battery cells, and the plurality of bus bar plates are disposed across the plurality of battery blocks and electrically connect the plurality of battery cells included in one battery block and the plurality of battery cells included in the other battery blocks. And mechanically connecting the plurality of battery blocks to each other.

Description

Technical Field

[0001] This disclosure relates to a power supply device comprising multiple battery blocks having multiple secondary battery cells connected together. Background Technology

[0002] Power devices that integrate multiple rechargeable secondary battery cells have been developed. These power devices are used as power sources for electric vehicles, electric heavy machinery, and in stationary energy storage applications such as backup power for servers, and as power sources for homes, offices, and factories. In recent years, there has been a demand for higher capacity power devices, leading to the adoption of power devices with more integrated secondary battery cells. Such power devices achieve high overall capacity by connecting battery packs containing multiple secondary battery cells in series or parallel using metal busbars.

[0003] Power supply devices that connect multiple battery cells use fasteners to physically connect the cells to each other. However, in structures that use fasteners to connect the battery cells, there is a problem that the size increases accordingly, resulting in a decrease in energy density relative to volume. In addition, the need for fasteners also increases the number of parts, manufacturing processes, and manufacturing costs.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Publication No. 2021-503157 Summary of the Invention

[0007] One object of this disclosure is to provide a power supply device that connects multiple battery blocks having multiple secondary battery cells, which does not require separate fasteners for connecting the battery blocks to each other, thereby simplifying the structure and reducing the size.

[0008] Furthermore, the description of these objectives and issues does not preclude the existence of other objectives and issues. Additionally, one aspect of this disclosure does not need to solve all of these issues. Moreover, based on the description, drawings, and technical solutions of this disclosure, other issues can be identified.

[0009] The power supply device according to a certain aspect of this disclosure includes: a plurality of battery blocks, each comprising a plurality of secondary battery cells; and a plurality of busbars, wherein any one of the plurality of secondary battery cells constituting one battery block is connected to any one of the plurality of secondary battery cells constituting another battery block. Each of the plurality of battery blocks comprises a plurality of battery cells, each battery cell being composed of a plurality of secondary battery cells. The plurality of busbars are arranged across the plurality of battery blocks, electrically connecting the plurality of battery cells included in one battery block to the plurality of battery cells included in other battery blocks, and mechanically connecting the plurality of battery blocks to each other.

[0010] The power supply device disclosed herein does not require additional fasteners for connecting multiple battery blocks with multiple secondary battery cells to each other, which simplifies the structure and reduces the size of the power supply device. Attached Figure Description

[0011] Figure 1 This is a perspective view of the power supply device according to Embodiment 1 of this disclosure.

[0012] Figure 2 yes Figure 1 The rear perspective view of the power supply device is shown.

[0013] Figure 3 yes Figure 1 An exploded perspective view of the power supply device shown.

[0014] Figure 4 yes Figure 1 The right-side view of the power supply unit shown.

[0015] Figure 5 yes Figure 1 Left side view of the power supply unit shown.

[0016] Figure 6 yes Figure 1 An exploded perspective view of the battery block of the power supply device shown.

[0017] Figure 7 yes Figure 1 The diagram shows a schematic structure of the power supply device.

[0018] Figure 8 This is a right-side view of the power supply device according to Embodiment 2 of this disclosure.

[0019] Figure 9 yes Figure 8 Left side view of the power supply unit shown.

[0020] Figure 10 This is a right-side view of the power supply device according to Embodiment 3 of this disclosure.

[0021] Figure 11 yes Figure 10 Left side view of the power supply unit shown.

[0022] Figure 12 yes Figure 10 The diagram shows a schematic structure of the power supply device.

[0023] Figure 13 This is a right-side view of the power supply device according to Embodiment 4 of this disclosure.

[0024] Figure 14 yes Figure 13 The diagram shows a schematic structure of the power supply device.

[0025] Figure 15 This is a right-side view of the power supply device according to Embodiment 5 of this disclosure.

[0026] Figure 16 yes Figure 15 Left side view of the power supply unit shown.

[0027] Figure 17 This is a right-side view of the power supply device according to Embodiment 6 of this disclosure.

[0028] Figure 18 yes Figure 17 Left side view of the power supply unit shown.

[0029] Figure 19 yes Figures 15 to 18 The equivalent circuit diagram of the power supply device is shown.

[0030] Figure 20 This is a perspective view of the power supply device involved in the comparative example.

[0031] Figure 21 yes Figure 20 The rear perspective view of the power supply device is shown.

[0032] Figure 22 yes Figure 20 The diagram shows a schematic structure of the power supply device. Detailed Implementation

[0033] First, one focus of this disclosure will be explained. A power supply device comprising multiple secondary battery cells stacks and connects multiple battery blocks comprising multiple secondary battery cells in multiple stages, achieving high capacity as a whole. An example of a power supply device comprising stacked and connected multiple battery blocks is shown below. Figures 20-22The power supply device 90 shown in these figures connects and fixes two battery blocks 91, each containing multiple secondary battery cells, in an upper and lower two-stage configuration. The battery blocks 91 are configured such that lead plates 95 connect the electrodes at the upper and lower ends of the multiple secondary battery cells to connect them in parallel, and busbars 93 connect the upper and lower lead plates 95 to connect the multiple secondary battery cells in series. As shown, multiple rows of lead plates 95 are arranged in parallel on the upper and lower surfaces of the rectangular box-shaped battery holder 92 of the battery block 91, and multiple rows of busbars 93 electrically connect the upper and lower lead plates 95 on the side of the battery block 91.

[0034] The power supply device 90 stacks battery blocks 91 in two layers, and connects and fixes the stacked battery blocks 91 to each other at both end faces via fasteners 98. The fasteners 98 shown in the figure are metal plates that connect and fix the battery holders 92 of the stacked battery blocks 91 to each other. In this structure using fasteners to connect the battery blocks, there is a problem of increased size and reduced energy density relative to volume. Furthermore, the need for fasteners to mechanically connect the battery blocks increases the number of parts, manufacturing steps, and manufacturing costs.

[0035] Furthermore, the power supply device 90 shown in the figure connects multiple battery blocks 91 in series to increase the output voltage. However, in the configuration where multiple battery blocks 91 are connected in series with overlapping sections, the potential difference between opposing secondary battery cells increases on the total output side of the series-connected battery blocks 91. Therefore, a countermeasure is needed to prevent short circuits between opposing battery blocks 91 when submerged in water. Therefore, as... Figure 22 As shown, this power supply device requires insulating members 99, such as insulating plates, to be placed on the opposing portions of the battery blocks 91. This disclosure was developed to eliminate such problems.

[0036] An embodiment of the present disclosure discloses a power supply device comprising: a plurality of battery blocks, each comprising a plurality of secondary battery cells; and a plurality of busbars, wherein any one of the plurality of secondary battery cells constituting one battery block is connected to any one of the plurality of secondary battery cells constituting another battery block in the plurality of battery blocks, the plurality of battery blocks each comprising a plurality of battery units, the battery units being composed of a plurality of secondary battery cells, the plurality of busbars being arranged across the plurality of battery blocks, electrically connecting the plurality of battery units included in one battery block to the plurality of battery units included in other battery blocks respectively, and mechanically connecting the plurality of battery blocks to each other.

[0037] According to the above structure, multiple busbars arranged across multiple battery blocks electrically connect multiple battery cells in one battery block to multiple battery cells in other battery blocks, and mechanically connect the multiple battery blocks to each other. Therefore, the busbars that electrically connect the battery cells of multiple battery blocks can also serve as fixing members for mechanically connecting the multiple battery blocks, enabling reliable connection and fixation of the multiple battery blocks. This eliminates the need for separate fixing members between battery blocks, simplifying the structure and reducing the size of the power supply unit.

[0038] In another aspect of the power supply device disclosed herein, multiple battery blocks are stacked in a side-by-side arrangement with their sides facing each other, and the multiple battery blocks are connected to each other by multiple busbars on their sides.

[0039] According to the above structure, since multiple battery blocks stacked side by side are connected to each other by multiple busbars on both sides of the battery block, multiple busbars can be arranged along the sides of the multiple stacked battery blocks to physically connect the battery blocks to each other. The multiple busbars can not only bear the electrical connection between the battery blocks, but also the mechanical connection.

[0040] In another aspect of the power supply device disclosed herein, the battery block includes a battery holding member that holds multiple secondary battery cells in a parallel arrangement and holds the end face electrodes of the multiple secondary battery cells arranged at both ends along their length in a plane-like arrangement. The side of the battery holding member is configured as a mounting surface for multiple busbars, and the end face electrodes of the multiple secondary battery cells arranged in a plane-like arrangement are connected by lead plates to form a battery cell. Each lead plate has a connection portion with a busbar at one end, and the connection portion is located on the mounting surface of the battery holding member. The busbars mounted on the mounting surface are stacked on the connection portion, and fixing screws passing through the busbars and the connection portion are fixed to the battery holding member, thereby electrically connecting the busbars to the battery cell and mechanically connecting the busbars to the battery holding member.

[0041] In this specification, the term "side by side in the same plane" is not necessarily limited to a state of being side by side on the same plane, but is used in a broader sense to include a state of being slightly offset from the same plane, such as being side by side in a parallel posture or a slightly tilted posture.

[0042] According to the above structure, it has the advantage of being able to connect the busbar plate to the battery block electrically and mechanically in a simple and reliable manner. This is because the power battery block has a battery holder that holds multiple secondary battery cells in a fixed position, the side of the battery holder is set as the mounting surface of the busbar plate, the connecting portion provided at the end of the lead plate is disposed on the mounting surface, the lead plate is respectively connected to the end face electrodes of the secondary battery cells arranged side by side in the same plane, and the fixing screws that pass through the end connecting portion and the connecting portion of the busbar plate disposed on the mounting surface are fixed to the battery holder, thereby electrically connecting the busbar plate to the battery cells and mechanically connecting the busbar plate to the battery holder.

[0043] In another aspect of the power supply device disclosed herein, a plurality of battery blocks include a first battery block and a second battery block stacked on top of each other. The lead plate has: a first lead plate connecting the first electrodes of a plurality of secondary battery cells; and a second lead plate connecting the second electrodes of the plurality of secondary battery cells opposite to the first electrodes. The battery cell is a parallel unit formed by connecting a plurality of secondary battery cells in parallel via the first and second lead plates. A plurality of busbars alternately connect the plurality of battery cells included in the first battery block and the plurality of battery cells included in the second battery block in series.

[0044] The power supply device described above connects multiple parallel battery cells in series via a busbar. Therefore, the total current flowing through the parallel units increases the current in the busbar. To reduce resistance, a wide and thick metal plate, i.e., a metal plate with a large cross-sectional area, is preferred for the busbar. This increases the rigidity of the metal plate, allowing for a strong mechanical connection between multiple battery cells.

[0045] In another aspect of the power supply device disclosed herein, each battery block has a first lead plate connected to a first electrode disposed on the first main surface side of each battery block, and a second lead plate connected to a second electrode disposed on the second main surface side opposite to the first main surface. The first battery block and the second battery block are stacked in an orientation where the second main surface of the first battery block and the second main surface of the second battery block face each other to form a battery pack. The first lead plates of the plurality of battery cells included in the first battery block are connected to the second lead plates of the plurality of battery cells included in the second battery block through a busbar plate, and the second lead plates of the plurality of battery cells included in the first battery block are connected to the first lead plates of the plurality of battery cells included in the second battery block through a busbar plate.

[0046] In another aspect of the power supply device disclosed herein, each battery block has a first lead plate connected to a first electrode disposed on the first main surface side of each battery block, and a second lead plate connected to a second electrode disposed on the second main surface side opposite to the first main surface. The first battery block and the second battery block are stacked with the second main surface of the first battery block facing the first main surface of the second battery block to form a battery pack. The first lead plates of the plurality of battery cells included in the first battery block are connected to the second lead plates of the plurality of battery cells included in the second battery block through a busbar plate, and the second lead plates of the plurality of battery cells included in the first battery block are connected to the first lead plates of the plurality of battery cells included in the second battery block through a busbar plate.

[0047] In another aspect of the power supply device disclosed herein, the busbar includes: a first plate disposed on a first side of the battery block; and a second plate disposed on a second side of the battery block opposite to the first side. The first and second battery blocks have n battery cells arranged from the first end face toward the opposite second end face. Opposite battery blocks are on their first side faces, and each battery cell in the first to nth positions of the first battery block and each battery cell in the second battery block are connected in series via the first plate. Opposite battery blocks are on their second side faces, and each battery cell in the first to (n-1)th positions of the first battery block and each battery cell in the second battery block are connected in series via the second plate. The battery cell in the first position and the battery cell in the nth position are connected to an output terminal on the electrode side not connected to the busbar. Here, n is a natural number of 2 or more.

[0048] Based on the above connection structure, since the battery cells included in the first battery block and the battery cells included in the second battery block are connected sequentially from the first end face side toward the second end face side between the opposing battery blocks, it has the advantage of being able to connect multiple battery cells in series with each other in the simplest structure.

[0049] Furthermore, the above structure has the advantage of reducing the potential difference between the opposing surfaces of the battery cells and simplifying the physical structure used for insulation between the battery cells. Therefore, the insulating plates for underwater protection disposed on the opposing surfaces between the battery cells can be omitted.

[0050] In another aspect of the power supply device disclosed herein, a plurality of battery blocks are provided on a first side, and a non-connection area without a first board is provided along the length of the first side. In the non-connection area, a circuit board or an output busbar is provided.

[0051] According to the above structure, since multiple battery blocks are provided on the first side, and a non-connection area without the first board is provided along the length of the first side, a circuit board or an output busbar can be provided in the non-connection area.

[0052] In another aspect of the power supply device disclosed herein, a plurality of battery blocks are provided on a second side, and a non-connection area without a second board is provided along the length of the second side. A circuit board or an output busbar is provided in the non-connection area.

[0053] According to the above structure, since multiple battery blocks are provided on the second side, and a non-connection area without a second board is provided along the length of the second side, a circuit board or an output busbar can be provided in the non-connection area.

[0054] In another aspect of the power supply device disclosed herein, a first battery block and a second battery block are arranged with multiple battery cells from a first end face toward a second end face on the opposite side. Battery cells in odd-numbered positions in the first battery block and battery cells in even-numbered positions in the second battery block are connected in series alternately via multiple busbars. Battery cells in odd-numbered positions in the second battery block and battery cells in even-numbered positions in the first battery block are also connected in series alternately via multiple busbars. Battery cells located closest to the second end face are connected in series with each other via connecting busbars.

[0055] Based on the above connection structure, the following advantages are available: when connecting the battery cells included in the first battery block and the battery cells included in the second battery block sequentially from the first end face side, the odd-numbered battery cells of one battery block and the even-numbered battery cells of the other battery block are connected alternately, and then folded back on the second end face side to connect all the battery cells in series, thereby enabling the positive and negative output terminals to be arranged on the first end face side.

[0056] In another aspect of the power supply device disclosed herein, each battery block is configured such that the positive and negative polarities of multiple battery cells alternately become opposite. On the opposing surfaces of the first and second battery blocks stacked on top of each other, the polarities of the opposing electrodes of the battery cells disposed at opposing positions become opposite. On the surfaces of the first and second battery blocks opposite to the opposing surfaces, adjacent battery cells are connected in series with each other. On the opposing surfaces, the opposing battery cells are connected in series with each other via multiple busbars.

[0057] According to the above structure, since each battery block configures multiple battery cells with alternating positive and negative polarities, the stacked battery blocks connect adjacent battery cells in series on the opposite side of the face to the opposite side. At the same time, on the opposite side, multiple busbars connect battery cells with opposite polarities to each other. Therefore, it is possible to connect all battery cells composed of multiple secondary battery cells in series with a simple structure, and at the same time, the stacked battery blocks are mechanically connected to each other through the busbars.

[0058] In another aspect of the power supply device disclosed herein, the device further comprises: an outer casing that houses a battery pack formed by connecting multiple battery blocks via multiple busbars; each of the multiple secondary battery cells has a gas discharge valve that opens in response to an increase in internal pressure on any of its electrode surfaces; and the multiple battery blocks hold the multiple secondary battery cells in an orientation in which the electrode surfaces with the gas discharge valves face the outer casing.

[0059] With the above structure, even if the gas vent valve in a certain secondary battery cell activates and discharges high-pressure gas from the electrode surface, by setting it to face the outer casing, it is possible to avoid the situation where high-pressure gas is sprayed onto the electrode surfaces of other battery cells, thus improving safety.

[0060] In another aspect of the power supply device disclosed herein, among a plurality of battery blocks, the potential difference between adjacent battery blocks is such that the potential difference between the electrode surfaces of opposing secondary battery cells is less than the electromotive force of one secondary battery cell.

[0061] The above structure offers the following advantages: by reducing the potential difference between the opposing surfaces of the battery cells, the physical structure for insulating the battery cells can be simplified. In conventional structures, the potential difference between the electrodes of adjacent battery cells increases, requiring an insulating plate submerged in salt water. However, in this design, by focusing on the fastening method, the potential difference between adjacent battery cells is reduced, eliminating the need for an insulating plate.

[0062] In another aspect of the power supply device disclosed herein, a plurality of battery blocks include a first battery block and a second battery block stacked on top of each other. The lead plate has: a first lead plate for connecting the first electrodes of a plurality of secondary battery cells; and a second lead plate for connecting the second electrodes of the plurality of secondary battery cells on the opposite side of the first electrodes. The battery cell is a parallel unit formed by connecting a plurality of secondary battery cells in parallel via the first lead plate and the second lead plate. Among the plurality of battery cells included in the first battery block and the plurality of battery cells included in the second battery block, a plurality of busbars connect the battery cells arranged opposite each other in parallel and connect the battery cells arranged adjacent to each other in series.

[0063] According to the above structure, since the battery cells in the first battery block and the battery cells in the second battery block are connected in parallel with each other, and adjacent battery cells are connected in series with each other, the first battery block and the second battery block can be mechanically connected, thereby increasing the capacity of the power supply device. In particular, since the total output voltage of the interconnected first and second battery blocks can be made equal to the total output of each individual first and second battery block, no voltage adjustment with the load side is required during use, making it simple and easy to achieve high capacity.

[0064] In another aspect of the power supply device disclosed herein, a plurality of battery cells are arranged from a first end face toward a second end face on the opposite side of the first battery block 10. The opposing battery blocks are located on the first side of the battery block 10, and a busbar connects the first lead plate of the battery cell at position (2n-1) and the second lead plate of the battery cell at position 2n. The opposing battery blocks are located on the second side of the battery block 10, and a busbar connects the first lead plate of the battery cell at position 2n and the second lead plate of the battery cell at position (2n+1). Here, n is a natural number.

[0065] The above power supply device has the following advantages: it can connect battery cells in parallel between stacked battery blocks, while eliminating and equalizing the current imbalance between the secondary battery cells in the parallel units. This is because, via busbars alternately arranged on the first and second sides of the battery blocks, opposing battery cells are connected in parallel between opposing battery blocks, while adjacent battery cells are connected in series. According to this configuration, each battery cell is energized from the first side towards the second side, or from the second side towards the first side. Thus, the multiple secondary battery cells constituting each battery cell are connected to the busbars via lead plates with the same resistance, effectively eliminating the current imbalance between the secondary battery cells.

[0066] [Implementation Method 1]

[0067] Figures 1 to 7 The power supply device 100 according to Embodiment 1 is shown. Figure 1 A perspective view of the power supply device is shown. Figure 2 It shows Figure 1 Rear-view perspective view of the power supply unit. Figure 3 It shows Figure 1 An exploded perspective view of the power supply unit. Figure 4 and Figure 5 It shows Figure 1 Right side view and left side view of the power supply unit. Figure 6 An exploded perspective view of the battery pack is shown. Figure 7 A schematic diagram showing the connection status of the battery pack is shown.

[0068] Figure 1 The power supply device 100 shown includes: a plurality of battery blocks 10, each comprising a plurality of secondary battery cells 1; and a plurality of busbars 3, which connect any one of the secondary battery cells 1 constituting one battery block 10 to any one of the secondary battery cells 1 constituting another battery block 10. Each of the battery blocks 10 comprises a plurality of battery units 2, each battery unit 2 being composed of a plurality of secondary battery cells 1. The plurality of busbars 3 are arranged across the plurality of battery blocks 10, electrically connecting the plurality of battery units 2 included in one battery block 10 to the plurality of battery units 2 included in other battery blocks 10, and mechanically connecting the plurality of battery blocks 10 to each other.

[0069] The power supply device 100 shown in the figure includes a first battery block 10A and a second battery block 10B stacked on top of each other as a plurality of battery blocks 10. The plurality of battery blocks 10 are stacked in a side-by-side arrangement with their respective sides 12 side by side, and the plurality of battery blocks 10 are connected to each other on their respective sides 12 by a plurality of busbars 3. The plurality of battery blocks 10 are preferably arranged in a manner in which their respective sides 12 are aligned on the same plane, but they may also be arranged in a manner slightly offset from the same plane. Figure 7 The power supply unit 100 shown in the outline structural diagram houses a battery pack 9, which consists of multiple battery blocks 10 connected by multiple busbars 3, within an outer casing 8.

[0070] (Battery Block 10)

[0071] Figures 1 to 7 The battery block 10 shown is generally rectangular in shape. For example... Figures 1-3 As shown, the battery block 10, which has a cuboid shape, includes: a main surface 11 arranged vertically, side surfaces 12 arranged on both sides, and end surfaces 13 arranged front and rear. Specifically, the battery block 10 includes: a pair of main surfaces 11 formed by a first main surface 11A and a second main surface 11B arranged parallel to each other; a pair of side surfaces 12 formed by a first side surface 12A and a second side surface 12B arranged parallel to each other and connecting the side edges of the first main surface 11A and the second main surface 11B to each other; and a pair of end surfaces 13 formed by a first end surface 13A and a second end surface 13B arranged parallel to each other and connecting the end edges of the pair of main surfaces 11 and the pair of side surfaces 12 to each other.

[0072] The battery block 10 includes a battery holder 20 that arranges each secondary battery cell 1 in a given posture at a fixed position. The battery holder 20 holds the multiple secondary battery cells 1 in a parallel posture, and holds the end face electrodes provided at both ends of the multiple secondary battery cells 1 in a side-by-side posture with the same plane. The battery holder 20 is a molded body made of insulating material such as plastic, and includes an insertion tube portion 21 into which each secondary battery cell 1 is inserted and arranged in a fixed position. Figure 6 The battery holder 20 shown is divided into a first holder 20A and a second holder 20B in the middle of the length direction of the battery cell, and clamps the two ends of the multiple secondary battery cells 1 from both sides and arranges them in a fixed position with the cells inserted into the insertion tube 21. The side surfaces of the battery holder 20 are set as arrangement surfaces 22 for arranging multiple busbar plates 3.

[0073] Furthermore, the battery block 10 is configured to form a battery cell 2 by connecting the end face electrodes of multiple secondary battery cells 1 arranged side by side in the same planar shape via a lead plate 5. The battery block 10 has multiple battery cells 2, which are arranged in multiple rows and connected to adjacent battery cells 2 via a busbar plate 3. Figure 6 The battery block shown has 11 secondary battery cells 1 arranged in parallel along the diameter in one column. With two columns of cells arranged side-by-side, the upper and lower end electrodes are connected via lead plates 5, forming battery units 2. Adjacent battery columns have their secondary battery cells 1 positioned between the valleys of one column, ensuring close proximity between adjacent columns. The battery block 10 consists of 7 groups of battery units 2, each containing 154 secondary battery cells 1 arranged side-by-side.

[0074] Figure 3 The battery cell 2 shown has two adjacent secondary battery cells 1 arranged side by side along the long side of the lead plate 5, and connected in parallel by a first lead plate 5A disposed on the upper surface and a second lead plate 5B disposed on the lower surface. However, the battery cell can also have secondary battery cells arranged in one or more rows along the long side of the lead plate, and connected in parallel by the first lead plate and the second lead plate.

[0075] (Secondary battery cell 1)

[0076] The secondary battery cell 1 is a non-aqueous electrolyte secondary battery cell such as a lithium-ion battery. However, this disclosure does not limit the secondary battery cell 1 to a lithium-ion battery, and all currently used and future-developed secondary batteries such as other non-aqueous electrolyte secondary batteries and nickel-metal hydride batteries can be used. Figure 6The secondary battery cell 1 shown is a cylindrical battery with both ends as end-face electrodes. However, the battery pack disclosed herein does not limit the battery to a cylindrical shape. This is because rechargeable prismatic batteries, etc., can also be used as battery cells. The secondary battery cell 1 has a first electrode 1A, which is one end face, as the positive electrode, and a second electrode 1B, which is the other end face, as the negative electrode. The secondary battery cell 1 has a gas discharge valve (not shown) that opens in response to an increase in internal pressure at either electrode. The secondary battery cell shown in the figure has a discharge valve at the first electrode 1A, which is the positive electrode.

[0077] (Leaderboard 5)

[0078] The lead plate 5 includes a first lead plate 5A connecting the first electrodes 1A of multiple secondary battery cells 1, and a second lead plate 5B connecting the second electrodes 1B of multiple secondary battery cells 1. The battery unit 2 is configured as a parallel unit formed by connecting multiple secondary battery cells 1 in parallel via the first lead plate 5A and the second lead plate 5B. The multiple battery units 2 included in the first battery block 10A and the multiple battery units 2 included in the second battery block 10B are connected in series via multiple busbars 3.

[0079] To connect battery cells 2 in series between adjacent battery blocks 10, the lead plate 5 has a connecting portion 5x at one end of each of the first lead plate 5A and the second lead plate 5B for connection with the busbar plate 3. The first lead plate 5A and the second lead plate 5B have connecting portions 5x at opposite ends of each other. The structure, shape, and size of the connecting portion 5x are not limited, but the connecting portion 5x can be, for example, formed by folding back one end of the lead plate 5 at a 90-degree angle, creating a shape and angle that facilitates connection between the horizontally positioned lead plate 5 and the vertically positioned busbar plate 3. Figure 6 As shown, the first lead plate 5A has a connecting portion 5x at one end, and the second lead plate 5B has a connecting portion 5x at the other end. The connecting portions 5x of the first lead plate 5A and the connecting portions 5x of the second lead plate 5B are arranged at opposite ends of the battery cell 2.

[0080] A connecting portion 5x is disposed on the mounting surface 22 of the battery holder 20, and connects to the end of the busbar 3 when the mounting surface 22 is provided. The connecting portion 5x overlaps with the end of the busbar 3, and a fixing screw 4, which passes through the end of the busbar 3 and the connecting portion 5x, is fixed to the battery holder 20, thereby electrically connecting the busbar 3 to the battery cell 2 and mechanically connecting the busbar 3 to the battery holder 20. Although not shown, in order to more securely screw the fixing screw 4 into the battery holder 20, a reinforcing collar can be embedded and fixed at the connection position between the connecting portion 5x and the busbar 3.

[0081] (Busbar 3)

[0082] The busbar 3 is a slender metal plate with conductivity such as aluminum, nickel, or copper. Since the total current of the battery cells 2 flows through the busbar 3, a metal plate with a larger current capacity than the lead plate 5 is used. The busbar 3 can use the same metal material as the lead plate 5. Furthermore, the busbar 3 also serves as a component for mechanically connecting the stacked battery cells. Therefore, the metal busbar 3 also requires strength to hold the connected battery cells 10 in a fixed position. The material, thickness, and width of the busbar 3 are determined by considering these requirements. Here, the busbar 3, which connects multiple parallel cells in series, requires reduced resistance, but this can be eliminated by making the busbar 3 a metal plate with a large cross-sectional area. At the same time, it is advantageous to increase the rigidity of the busbar.

[0083] As follows, the power supply device 100 alternately connects in series the plurality of battery cells 2 included in the first battery block 10A and the plurality of battery cells 2 included in the second battery block 10B. Figure 4 , Figure 5 as well as Figure 7 The battery blocks 10 shown have first lead plates 5A connected to the first electrode 1A disposed on their respective first main surfaces 11A sides, and second lead plates 5B connected to the second electrode 1B disposed on their respective second main surfaces 11B sides. The power supply device 100 in the figure stacks the first battery block 10A and the second battery block 10B in an orientation where the second main surfaces 11B of the first battery block 10A and the second main surfaces 11B of the second battery block 10B face each other to form a battery pack 9. That is, the stacked battery blocks 10 are stacked such that they face each other as the negative electrodes of the second electrode 1B.

[0084] like Figure 5 As shown, the power supply device 100 is located on the second side 12B of the battery block 10. The first lead plate 5A of the plurality of battery cells 2 included in the first battery block 10A is connected to the second lead plate 5B of the plurality of battery cells 2 included in the second battery block 10B. Additionally, as... Figure 4 As shown, on the first side 12A of the battery block 10, the second lead plate 5B of the plurality of battery cells 2 included in the first battery block 10A is connected to the first lead plate 5A of the plurality of battery cells 2 included in the second battery block 10B.

[0085] Figure 4 and Figure 5The busbar plate 3 shown includes: a first plate 3A disposed on the first side 12A of the battery block 10, and a second plate 3B disposed on the second side 12B of the battery block 10. Seven battery cells 2 are arranged in the first battery block 10A and the second battery block 10B from the first end face 13A toward the opposite second end face 13B. Figure 4 As shown, the opposing battery blocks 10 are located on their first side 12A, and the battery cells 2 located at positions 1 to 7 of the first battery block 10A and the battery cells 2 located at positions 1 to 7 of the second battery block 10B are connected in series via a first plate 3A. The first plate 3A shown in the figure is a plate arranged vertically in a straight line, connecting the second lead plate 5B of the battery cells 2 of the first battery block 10A and the first lead plate 5A of the battery cells 2 of the second battery block 10B, thus connecting these battery cells 2 in series. Furthermore, as... Figure 5 As shown, the opposing battery blocks 10 are located on their second side 12B, and the battery cells 2 located at positions 2 to 7 of the first battery block 10A and positions 1 to 6 of the second battery block 10B are connected in series via a second plate 3B. The second plate 3B shown in the figure is a plate-shaped structure arranged vertically at an angle, connecting the first lead plate 5A of the battery cells 2 in the first battery block 10A and the second lead plate 5B of the battery cells 2 in the second battery block 10B, thus connecting these battery cells 2 in series.

[0086] Furthermore, the power supply device 100 connects output terminals 15 to the electrode sides of the battery cell 2 located at the first position in the first battery block 10A and the battery cell 2 located at the seventh position in the second battery block 10B, where the busbar plate 3 is not connected. That is, the power supply device 100 connects the first electrode 1A side of the battery cell 2 located at the first position in the first battery block 10A and the second electrode 1B side of the battery cell 2 located at the seventh position in the second battery block 10B to the output terminals 15 respectively. By alternately connecting the battery cells 2 of the stacked battery blocks 10 in series from the first end face 13A side towards the second end face 13B side, the power supply device 100 can be configured with a simple structure while simultaneously connecting all battery cells 2 in series.

[0087] Furthermore, since the power supply device 100 alternately connects the battery cells 2 of the opposing battery blocks 10 in series via a first plate 3A disposed on the first side 12A of the battery block 10 and a second plate 3B disposed on the second side 12B, the plurality of secondary battery cells 1 constituting each battery cell 2 are energized either from the first side 12A towards the second side 12B or from the second side 12B towards the first side 12A. For example, in Figures 1 to 7In the power supply device 100 shown, during discharge, the plurality of battery cells 2 included in the first battery block 10A are energized from the first side 12A side toward the second side 12B side, and the plurality of battery cells 2 included in the second battery block 10B are energized from the second side 12B side toward the first side 12A side. Therefore, in the plurality of secondary battery cells 1 constituting each battery cell 2, a structure is formed in which the busbar plate 3 is connected via a lead plate with the same resistance, which has the advantage of eliminating the current imbalance between secondary battery cells and equalizing the current.

[0088] Furthermore, such as Figure 7 As shown, this power supply device 100 can ensure that the potential difference between the electrode surfaces of opposing secondary battery cells 1 in adjacent battery blocks 10 is below the electromotive force of a single secondary battery cell 1. Therefore, it has the advantage of simplifying the physical structure used for insulation between battery blocks. According to this structure, insulating members such as insulating plates that reduce the potential difference between adjacent battery cells 2 are also unnecessary.

[0089] Here, Figure 7 The power supply device 100 shown also includes an outer housing 8 that houses a battery pack 9 formed by connecting multiple battery blocks 10 via a busbar 3. In the battery block shown, each of the multiple secondary battery cells 1 constituting the battery block has a gas discharge valve on its first electrode 1A side that opens in response to an increase in internal pressure. That is, the power supply device 100 is configured such that the electrode surfaces of the multiple secondary battery cells 1 in the stacked battery blocks 10 with their gas discharge valves face the outer housing 8. Therefore, the power supply device 100 has the advantage that if an abnormality occurs in a certain secondary battery cell 1, even if the gas discharge valve opens in response to an increase in internal pressure, resulting in the ejection of high-temperature gas, the adverse effects on other secondary battery cells 1 can be reduced because the gas discharge valve is positioned facing the outer housing 8.

[0090] Furthermore, such as Figure 1 and Figure 2As shown, in the state where multiple battery cells 10 are connected, the power supply device 100 has a non-connection area 17 formed along the length of the first side 12A, where the first board 3A is not disposed, and a non-connection area 17 formed along the length of the second side 12B, where the second board 3B is not disposed. The power supply device 100 can arrange the circuit board 18 for voltage detection of each battery cell 2 in the non-connection area 17. Furthermore, the power supply device 100 can also arrange an output busbar 19 in the non-connection area 17. As shown by the dotted line in the figure, the configuration of arranging the output busbar 19 in the non-connection area 17 allows the positive and negative output terminals 15 to be arranged on a single end face 13.

[0091] (Implementation Method 2)

[0092] Furthermore, such as Figure 8 and Figure 9 As shown, the power supply device can also stack and connect the first battery block 10A and the second battery block 10B, such that the second main surface 11B of the first battery block 10A and the first main surface 11A of the second battery block 10B are in an opposing position. In this power supply device 200, the first battery block 10A, serving as the negative electrode of the second electrode 1B, and the second battery block 10B, serving as the positive electrode of the first electrode 1A, are stacked in an opposing position between the opposing battery blocks 10.

[0093] The power supply unit 200 is also related to Figure 4 and Figure 5 Similarly, in the power supply device 100 shown, opposing battery blocks 10 are connected in series on their first side 12A via a first plate 3A, with each battery cell 2 located at positions 1 to 7 of the first battery block 10A and each battery cell 2 located at positions 1 to 7 of the second battery block 10B connected in series. On the second side 12B, each battery cell 2 located at positions 2 to 7 of the first battery block 10A and each battery cell 2 located at positions 1 to 6 of the second battery block 10B connected in series via a second plate 3B. Figure 8 As shown, on the first side 12A, the power supply device 200 arranges the second lead plate 5B of the battery cell 2 of the first battery block 10A and the first lead plate 5A of the battery cell 2 of the second battery block 10B close together in the central portion, so that the opposing connecting parts 5x can be connected to each other with the shortest distance through the first plate 3A. Furthermore, as... Figure 9 As shown, on the second side 12B, the power supply device has the first lead plate 5A of the battery cell 2 of the first battery block 10A and the second lead plate 5B of the battery cell 2 of the second battery block 10B arranged in a state of being separated vertically. Therefore, the second plate 3B is set as a plate that extends vertically in an inclined posture, so that these lead plates can be connected in series.

[0094] The power supply device 200 also connects the battery cells 2 of the opposing battery blocks 10 in series alternately via a first plate 3A disposed on the first side 12A of the battery block 10 and a second plate 3B disposed on the second side 12B. Therefore, in the plurality of secondary battery cells 1 constituting each battery cell 2, the first battery block 10A is energized from the first side 12A to the second side 12B (during discharge), or the second battery block 10B is energized from the second side 12B to the first side 12A (during discharge). Therefore, the plurality of secondary battery cells 1 constituting each battery cell 2 are connected to the busbar plate 3 via lead plates with the same resistance, which has the advantage of eliminating the current imbalance between secondary battery cells and equalizing the current.

[0095] With multiple battery blocks 10 connected, the power supply device 200 forms a non-connection area 17, which is not configured with the first board 3A, at the upper and lower ends of the first side 12A along the length direction of the second side. Therefore, the non-connection area 17 can also be used to configure a circuit board for voltage detection and a busbar for output.

[0096] (Implementation Method 3)

[0097] Furthermore, the power supply device can also power the plurality of battery cells 2 included in the first battery block 10A and the plurality of battery cells 2 included in the second battery block 10B via... Figures 10-12 The following configuration is shown for connection. The power supply device 300 in the figure also stacks the first battery block 10A and the second battery block 10B in an orientation in which the second main surface 11B of the first battery block 10A and the second main surface 11B of the second battery block 10B are opposite each other.

[0098] Figures 10-12 The first battery block 10A and the second battery block 10B shown have seven battery cells 2 arranged from the first end face 13A toward the opposite second end face 13B. Figure 11 As shown, the opposing battery blocks 10 are connected in series with each other via multiple busbars 3, with the battery cells 2 in the odd-numbered positions of the first battery block 10A and the battery cells 2 in the even-numbered positions of the second battery block 10B being connected in series with each other in an alternating manner.

[0099] Specifically, such as Figure 11As shown, on the second side 12B, the second lead plates 5B of each battery cell 2 at the 1st, 3rd, and 5th positions of the first battery block 10A and the first lead plates 5A of each battery cell 2 at the 2nd, 4th, and 6th positions of the second battery block 10B are connected in series via the second plate 3B. The second lead plates 5B of each battery cell 2 at the 3rd, 5th, and 7th positions of the second battery block 10B and the first lead plates 5A of each battery cell 2 at the 2nd, 4th, and 6th positions of the first battery block 10A are connected in series via the second plate 3B.

[0100] In addition, such as Figure 10 As shown, on the first side 12A, the first lead plate 5A of each battery cell 2 at the 1st, 3rd, and 5th positions of the second battery block 10B, and the second lead plate 5B of each battery cell 2 at the 2nd, 4th, and 6th positions of the first battery block 10A are connected in series via the first plate 3A. The first lead plate 5A of each battery cell 2 at the 3rd, 5th, and 7th positions of the first battery block 10A, and the second lead plate 5B of each battery cell 2 at the 2nd, 4th, and 6th positions of the second battery block 10B are connected in series via the first plate 3A.

[0101] The first plate 3A and the second plate 3B shown in these figures are plates arranged vertically and horizontally at an inclined position. They are connected to the first lead plate 5A and the second lead plate 5B of the corresponding battery cells 2, thus connecting these battery cells 2 in series. Furthermore, the battery cells 2 located on the side closest to the second end face are connected in series with each other via a connecting busbar 16. Figure 10 In the first side 12A, the second lead plate 5B of the battery cell 2 located at the 7th position of the first battery block 10A and the first lead plate 5A of the battery cell 2 located at the 7th position of the second battery block 10B are connected in series via a vertically extending straight connecting bus bar 16.

[0102] The power supply device 300 of this configuration connects the odd-numbered battery cells 2 of one battery block 10 and the even-numbered battery cells 2 of the other battery block 10 alternately, folds back on the second end face 13B side, and connects all the battery cells 2 in series, thereby having the advantage of being able to arrange the positive and negative output terminals 15 on the first end face 13A side.

[0103] Furthermore, the power supply device 300 also connects the battery cells 2 of the opposing battery blocks 10 in series alternately via a first plate 3A disposed on the first side 12A of the battery block 10 and a second plate 3B disposed on the second side 12B. Therefore, in the plurality of secondary battery cells 1 constituting each battery cell 2, power is supplied from the first side 12A towards the second side 12B, or from the second side 12B towards the first side 12A. That is, in Figures 10-12 In the power supply device 300 shown, during discharge, the plurality of battery cells 2 included in the first battery block 10A are energized from the first side 12A side toward the second side 12B side, and the plurality of battery cells 2 included in the second battery block 10B are energized from the second side 12B side toward the first side 12A side. Therefore, in the plurality of secondary battery cells 1 constituting each battery cell 2, a structure is formed in which the busbar plate 3 is connected via a lead plate with the same resistance, which has the advantage of eliminating the current imbalance between secondary battery cells and equalizing the current.

[0104] Furthermore, Figure 12 The power supply device 300 shown also includes: an outer casing 8, housing a battery pack 9 formed by connecting multiple battery blocks 10 via a busbar 3, wherein the electrode surfaces of the multiple secondary battery cells 1 of the stacked battery blocks 10, which are equipped with gas exhaust valves, are arranged in an orientation facing the outer casing 8. Therefore, this power supply device 300 also has the advantage that, in the event of an abnormality in any secondary battery cell 1, even if the gas exhaust valve opens in response to an increase in internal pressure, thereby ejecting high-temperature gas, the adverse effects on other secondary battery cells 1 can be reduced because the gas exhaust valve is arranged facing the outer casing 8.

[0105] In addition, such as Figure 12 As shown, in order to prevent short circuits between secondary battery cells 1 with voltage differences, the power supply device 300 is equipped with an insulating plate 29 in the opposite part of the stacked battery blocks 10.

[0106] Furthermore, the power supply device can also stack and connect the first and second battery blocks, so that... Figures 10-12 As shown, the configuration is such that the odd-numbered battery cells of one battery block and the even-numbered battery cells of the other battery block are connected alternately, while as... Figure 8 and Figure 9 As shown, the second main surface of the first battery block and the first main surface of the second battery block are in an opposing orientation.

[0107] (Implementation Method 4)

[0108] Furthermore, the power supply device can also be set as Figure 13 and Figure 14 The structure shown in these figures is such that the positive and negative polarities of the multiple battery cells 2 in each battery block 10 are alternately reversed. Furthermore, in the stacked first battery block 10A and second battery block 10B, the polarities of the opposing electrodes of the battery cells 2 disposed at opposing positions on opposing surfaces 31 are opposite. Adjacent battery cells 2 in the first battery block 10A and second battery block 10B are connected in series via connecting lead plates 33 on the surfaces opposite to the opposing surfaces 31. Furthermore, opposing battery cells 2 in the first battery block 10A and second battery block 10B are connected in series via multiple busbars 3 on the opposing surfaces 31.

[0109] Figure 13 The diagram shows a configuration where opposing lead plates 5 are connected in series via busbars 3 on the first side 12A of the battery block 10. Although not shown, opposing lead plates are also connected in series on the second side of the battery block 10 via busbars. Thus, the battery cells 2, arranged opposite each other, are electrically connected via multiple busbars 3, while the battery blocks 10 are mechanically connected, thereby securely linking the stacked battery blocks 10 together. The busbars 3 shown in the figure connect opposing battery cells 2 with the shortest possible distance, thus offering the advantage of simplified construction and weight reduction. The power supply device 400 can also utilize the areas on the sides without busbars 3 as non-connection areas.

[0110] (Implementation methods 5 and 6)

[0111] The power supply device described in the above embodiments is configured to connect multiple parallel units of stacked battery cells in series with each other. However, the power supply device can also connect multiple parallel units of stacked battery cells in parallel with each other and in series with each other. Figures 15-19 The power supply devices 500 and 600 shown are configured such that, among the plurality of battery cells 2 included in the first battery block 10A and the plurality of battery cells 2 included in the second battery block 10B, battery cells 2 arranged opposite each other are connected in parallel, and battery cells 2 arranged adjacent to each other are connected in series. Figure 15 and Figure 16 The power supply device 500 shown is configured such that the second main surface 11B of the first battery block 10A and the second main surface 11B of the second battery block 10B are facing each other, and the first battery block 10A and the second battery block 10B are stacked such that the negative electrodes of the second electrode 1B are facing each other. Furthermore, Figure 17 and Figure 18The power supply device 600 shown is configured such that the second main surface 11B of the first battery block 10A and the first main surface 11A of the second battery block 10B are opposite each other. The first battery block 10A and the second battery block 10B are stacked so that the negative terminal of the first battery block 10A and the positive terminal of the second battery block 10B are opposite each other.

[0112] exist Figures 15-19 In the power supply devices 500 and 600 shown, the first battery block 10A and the second battery block 10B each have seven battery cells 2 arranged from the first end face 13A toward the opposite second end face 13B. Figure 15 and Figure 17 As shown, the opposing battery blocks 10 are located on their first side 12A, and the first lead plates 5A of the battery cells 2 located at the 1st, 3rd, and 5th positions and the second lead plates 5B of the battery cells 2 located at the 2nd, 4th, and 6th positions are connected by a busbar plate 3. Additionally, as... Figure 16 and Figure 18 As shown, the battery blocks 10 are located on the second side 12B, and the first lead plates 5A of the battery cells 2 located at the 2nd, 4th, and 6th positions and the second lead plates 5B of the battery cells 2 located at the 3rd, 5th, and 7th positions are connected to each other via a busbar plate 3. Further, on the first side 12A, the first lead plates 5A of the battery cells 2 located at the 7th position are connected to each other via a connecting busbar 35 and connected to the output terminal 15; on the second side 12B, the second lead plates 5B of the battery cells 2 located at the 1st position are connected to each other via a connecting busbar 35 and connected to the output terminal 15.

[0113] Figure 15 and Figure 16 The busbar 3 shown includes: an intermediate connecting portion connecting the second lead plates 5B to each other, and an extension portion extending upward and downward at an inclined position from the intermediate connecting portion and connecting its front end to the first lead plate 5A, with the overall shape being approximately "U". This busbar 3 mainly functions to mechanically connect the battery blocks 10 to each other through the intermediate connecting portion connecting the second lead plates 5B of the opposing battery cells 2. However, the busbar 3 is not limited to the above shape; it can adopt various shapes that allow connecting a pair of first lead plates and a pair of second lead plates with a single plate. For example, it can also be configured to connect the plate portion connecting the first lead plates to each other and the plate portion connecting the second lead plates to each other using a connecting portion.

[0114] Figure 17 and Figure 18The busbar 3 shown includes: a straight section connecting the first lead plates 5A of the opposing battery cells 2 to each other; a straight section connecting the second lead plates 5B of the opposing battery cells 2 to each other; and a connecting section connecting these straight sections. The busbar 3 of this shape connects the opposing battery blocks 10 to each other through each straight section, and also mechanically connects the battery blocks 10 to each other in the connecting section.

[0115] The power supply devices 500 and 600 described above can make the busbars 3 arranged on the first side 12A and the second side 12B have the same shape. That is, the busbars 3 used on the first side 12A can be moved symmetrically or reversed left and right and used on the second side 12B. Therefore, in addition to reducing the manufacturing cost of the busbars, it is also possible to reduce misconnections during assembly.

[0116] The power supply devices 500 and 600 described above connect the battery cells 2 in the first battery block 10A and the second battery block 10B, respectively, in parallel, and connect adjacent battery cells 2 in series. Therefore, the total output voltage when multiple battery blocks 10 are connected is equal to the total output of each individual battery block 10. Thus, voltage adjustment with the load side is not required during use. In other words, high capacity can be achieved without changing the total output voltage.

[0117] Furthermore, the power supply devices 500 and 600 described above have the advantage that, between the stacked battery blocks 10, the imbalance of current flowing through the secondary battery cells constituting the parallel unit can be eliminated and equalized. This is because, via the busbars 3 alternately arranged on the first side 12A and the second side 12B of the battery blocks 10, the opposing battery cells 2 are connected in parallel to each other between the opposing battery blocks 10, while adjacent battery cells are connected in series to each other. Figure 19 Equivalent circuit diagrams of power supply devices 500 and 600 are shown. As shown in the figure, power supply devices 500 and 600 connect multiple battery cells 2 in parallel and series via busbars 3 arranged alternately on the first side 12A and the second side 12B. Therefore, each battery cell 2 is energized from the first side 12A towards the second side 12B, or from the second side 12B towards the first side 12A. This results in a structure in which the multiple secondary battery cells 1 constituting each battery cell 2 are connected to the busbars 3 via lead plates with the same resistance, thereby eliminating current imbalances among the secondary battery cells and equalizing the current.

[0118] In particular, the power supply devices 500 and 600 connect opposing battery cells 2 in parallel between the stacked battery blocks 10, thus increasing the number of parallel-connected secondary battery cells 1 compared to a single battery block 10. While a greater number of parallel-connected secondary battery cells 1 makes it easier for current imbalances to occur among the cells in the parallel battery blocks 2, the above configuration ensures that current flows evenly through each cell in the parallel battery blocks 2. Therefore, the power supply device can connect multiple secondary battery cells in parallel while eliminating current imbalances in each cell, resulting in a uniform current flow, effectively preventing degradation of specific cells, and extending the lifespan of the power supply device.

[0119] Furthermore, in the power supply devices shown in embodiments 1 to 6 above, the battery unit 2 connects multiple secondary battery cells in parallel via the first lead plate 5A and the second lead plate 5B. However, the battery unit can also be configured as a series-parallel unit that connects multiple secondary battery cells in parallel and in series. In the series-parallel unit that connects multiple secondary battery cells in parallel and in series, the multiple secondary battery cells constituting the battery unit alternately reverse every other multiple times, and electrodes with the same polarity are connected in parallel while electrodes with different polarities are connected in series, thus connecting multiple secondary battery cells in series and in parallel.

[0120] Industrial availability

[0121] This disclosure can be used as a power source for electric vehicles, electric heavy machinery, etc., or, in fixed-location energy storage applications, as a power source for energy storage systems in homes, offices, factories, etc., or as a backup power source for servers.

[0122] Symbol Explanation

[0123] 100, 200, 300, 400, 500, 600… power supply devices

[0124] 1…Secondary battery cell

[0125] 1A…First Electrode

[0126] 1B…Second Electrode

[0127] 2… Battery Unit

[0128] 3…Busbar

[0129] 3A…First Board

[0130] 3B…Second Board

[0131] 4… Fixing screws

[0132] 5…leadboard

[0133] 5A…First leadboard

[0134] 5B…Second Lead Plate

[0135] 5x…connecting parts

[0136] 8…Outer casing

[0137] 9… Battery pack

[0138] 10… battery blocks

[0139] 10A…First battery pack

[0140] 10B…Second battery pack

[0141] 11…Main side

[0142] 11A…First Main Face

[0143] 11B…Second Main Page

[0144] 12…side view

[0145] 12A…First side

[0146] 12B…Second Side

[0147] 13…End face

[0148] 13A…First end face

[0149] 13B…Second end face

[0150] 15… Output terminals

[0151] 16…Connecting busbars

[0152] 17…Non-connected regions

[0153] 18…Circuit board

[0154] 19… Output busbar

[0155] 20… Battery retainer

[0156] 20A…First retainer

[0157] 20B…Second retainer

[0158] 21…Insert tube section

[0159] 22… Configuration Surface

[0160] 29…Insulation board

[0161] 31… Opposite surfaces

[0162] 33…Connecting lead plate

[0163] 35…Connecting busbars

[0164] 90… power supply device

[0165] 91… battery block

[0166] 92… Battery retainer

[0167] 93…Busbar

[0168] 95…leadboard

[0169] 98…fasteners

[0170] 99… Insulating components.

Claims

1. A power supply device, comprising: Multiple battery blocks, each containing multiple secondary battery cells; and A plurality of busbars connect any one of the plurality of secondary battery cells constituting the first battery cell to any one of the plurality of secondary battery cells constituting the second battery cell in the plurality of battery cells comprising a first battery cell and a second battery cell. Each of the plurality of battery blocks comprises a plurality of battery cells, and each battery cell is composed of a plurality of the aforementioned secondary battery cells. The plurality of busbars are arranged across the plurality of battery blocks, electrically connecting the plurality of battery cells included in the first battery block and the plurality of battery cells included in the second battery block respectively, and mechanically connecting the plurality of battery blocks to each other.

2. The power supply device according to claim 1, wherein, The multiple battery blocks are stacked so that the sides of each battery block are arranged side by side. The battery blocks are connected to each other via the plurality of busbars on both sides of the battery blocks.

3. The power supply device according to claim 2, wherein, The plurality of secondary battery cells are each cylindrical in shape with their length direction as the axis. The battery block includes a battery holding member that holds the plurality of secondary battery cells parallel to their axes and holds the end face electrodes of the plurality of secondary battery cells arranged side by side in a planar manner along their length. The side of the battery holding member is configured as the mounting surface for the plurality of busbar plates, and the end face electrodes of the plurality of secondary battery cells arranged side by side in a planar manner are connected by lead plates to form the battery cell. The lead plate has a connection portion with the busbar plate at either end. The connecting portion is disposed on the mounting surface of the battery holder. The busbar plate, which is configured on the configuration surface, is stacked on the connecting portion, and the fixing screws passing through the busbar plate and the connecting portion are fixed to the battery holder, thereby electrically connecting the busbar plate to the battery cell and mechanically connecting the busbar plate to the battery holder.

4. The power supply device according to claim 3, wherein, The plurality of battery blocks include first battery blocks and second battery blocks stacked on top of each other. The lead plate has: a first lead plate for connecting the first electrodes of the plurality of secondary battery cells; and a second lead plate for connecting the second electrodes of the plurality of secondary battery cells on the opposite side to the first electrodes. The battery unit is a parallel unit formed by connecting multiple secondary battery cells in parallel via the first lead plate and the second lead plate. The plurality of busbars alternately connect the plurality of battery cells included in the first battery block and the plurality of battery cells included in the second battery block in series.

5. The power supply device according to claim 4, wherein, Each battery cell has its first lead plate, connected to the first electrode, positioned on its first main surface, and its second lead plate, connected to the second electrode, positioned on its second main surface opposite to the first main surface. The second main surface of the first battery block and the second main surface of the second battery block face each other, and the first battery block and the second battery block are stacked to form a battery pack. The first lead plate of the plurality of battery cells included in the first battery block is connected to the second lead plate of the plurality of battery cells included in the second battery block through the busbar plate. The second lead plate of the plurality of battery cells included in the first battery block is connected to the first lead plate of the plurality of battery cells included in the second battery block through the busbar plate.

6. The power supply device according to claim 4, wherein, Each battery cell has a first lead plate connected to the first electrode disposed on a first main surface of the battery cell, and a second lead plate connected to the second electrode disposed on a second main surface opposite to the first main surface. The second main surface of the first battery block and the first main surface of the second battery block face each other, and the first battery block and the second battery block are stacked to form a battery pack. The first lead plate of the plurality of battery cells included in the first battery block is connected to the second lead plate of the plurality of battery cells included in the second battery block through the busbar plate. The second lead plate of the plurality of battery cells included in the first battery block is connected to the first lead plate of the plurality of battery cells included in the second battery block through the busbar plate.

7. The power supply device according to claim 5 or 6, wherein, The busbar has the following features: The first plate is disposed on the first side of the battery block; and The second plate is disposed on the second side of the battery block opposite to the first side. The first battery block and the second battery block have n battery cells arranged from the first end face toward the opposite second end face, where n is a natural number greater than 2. The opposing battery blocks are located on the first side of each other, and the battery cells located at positions 1 to n of the first battery block and the battery cells located at positions 1 to n of the second battery block are connected in series via the first plate. The opposing battery blocks are located on each other on the second side, and the battery cells located at the 2nd to nth positions of the first battery block and the battery cells located at the 1st to (n-1)th positions of the second battery block are connected in series via the second plate. The battery cell configured in position 1 and the battery cell configured in position n have output terminals connected to the electrodes not connected to the busbar plate.

8. The power supply device according to claim 7, wherein, The plurality of battery blocks on the first side have a non-connected area from the first end face to the second end face of the first side, where the first plate is not configured. In the non-connection area, a circuit board or an output busbar is provided.

9. The power supply device according to claim 7, wherein, The plurality of battery blocks on the second side have a non-connected area from the first end face to the second end face on the second side, where the second plate is not configured. In the non-connection area, a circuit board or the output terminal is provided.

10. The power supply device according to claim 5 or 6, wherein, The first battery block and the second battery block are arranged with multiple battery cells facing from the first end face toward the opposite second end face. The battery cells in the first battery block located at odd-numbered positions and the battery cells in the second battery block located at even-numbered positions are connected in series alternately via the plurality of busbars. The battery cells in the second battery block located at odd-numbered positions and the battery cells in the first battery block located at even-numbered positions are connected in series alternately via the plurality of busbars. The battery cells located closest to the second end face are connected in series with each other via connecting busbars.

11. The power supply device according to claim 4, wherein, Each battery block is configured such that the positive and negative polarities of multiple battery cells alternately become opposite. In the first and second battery blocks stacked on top of each other, the polarities of the opposing electrodes of the battery cells located at opposite positions are opposite to each other. The first battery block and the second battery block connect adjacent battery cells in series on the opposite side of the opposing surface, and on the opposing surface, the opposing battery cells are connected in series via the plurality of busbars.

12. The power supply device according to claim 1 or 5, wherein, The power supply device further includes: an outer casing that houses a battery pack formed by connecting the multiple battery cells via the multiple busbars. Each of the multiple secondary battery cells has a gas discharge valve that opens in response to an increase in internal pressure on any one of its electrode surfaces. The plurality of battery blocks respectively hold the plurality of secondary battery cells with the electrode surface of the gas discharge valve facing the outer casing.

13. The power supply device according to any one of claims 1, 5, and 6, wherein, Among the plurality of battery blocks, the potential difference between adjacent battery blocks is such that the potential difference between the electrode surfaces of the opposing secondary battery cells is less than the electromotive force of one secondary battery cell.

14. The power supply device according to claim 3, wherein, The plurality of battery blocks include a first battery block and a second battery block stacked on top of each other. The lead plate has: a first lead plate for connecting the first electrodes of the plurality of secondary battery cells; and a second lead plate for connecting the second electrodes of the plurality of secondary battery cells on the opposite side to the first electrodes. The battery unit is a parallel unit formed by connecting multiple secondary battery cells in parallel via the first lead plate and the second lead plate. In the plurality of battery cells included in the first battery block and the plurality of battery cells included in the second battery block, the plurality of busbars connect the battery cells that are arranged opposite each other in parallel and connect the battery cells that are arranged adjacent to each other in series.

15. The power supply device according to claim 14, wherein, The first battery block and the second battery block are arranged with multiple battery cells facing from the first end face toward the opposite second end face. The opposing battery blocks are connected to each other on their first sides by a busbar plate, wherein the first lead plate of the battery cell at position (2m-1) and the second lead plate of the battery cell at position 2m are connected to each other, where m is a natural number. The opposing battery blocks are connected to each other on the second side of the battery block by the busbar plate, which connects the first lead plate of the battery cell at position 2m to the second lead plate of the battery cell at position (2m+1).

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