Power supply system

Abstract

Comprises: a plurality of battery cells each having an end surface; an exterior case that accommodates the plurality of battery cells and has a lower surface as a thermally conductive bottom plate that is thermally coupled to the end surfaces of the plurality of battery cells; and a cooling plate thermally coupled to a second surface of the bottom plate on the opposite side to a first surface thermally coupled to end surfaces of the plurality of battery cells.

Description

Technical Field

[0001] This disclosure relates to power supply systems. Background Technology

[0002] Power supply devices (power systems) utilize multiple rechargeable secondary battery cells, such as lithium-ion secondary batteries, connected in series or parallel for driving electrical equipment or electric mobile bodies such as vehicles and construction machinery, or for stationary energy storage or backup purposes (e.g., Patent Document 1). In such power supply devices, the secondary battery cells generate heat during charging and discharging, thus requiring cooling. To efficiently cool multiple secondary battery cells, a cooling plate is thermally coupled to the bottom surface of each secondary battery cell. In this cooling method using a cooling plate, efficient heat conduction between the bottom surface of the secondary battery cell and the cooling plate is required.

[0003] In this cooling method using a cooling plate, the bottom plate is considered to be placed between the bottom surface of the secondary battery cell and the cooling plate, with heat dissipation achieved through heat conduction via the bottom plate. However, when the bottom plate is used to cover the bottom surface of the secondary battery cell, there is a problem of insufficient rigidity in the part that fixes the power supply device.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2014 / 034079 Summary of the Invention

[0007] One objective of this disclosure is to provide a power system capable of efficiently cooling individual battery cells using a cooling plate. Another objective is to provide a power system that improves rigidity in a structure utilizing a cooling plate to cool individual battery cells. Furthermore, the description of these objectives and issues does not preclude the existence of other objectives and issues. Moreover, one aspect of this disclosure does not need to solve all of these issues. Furthermore, additional issues can be identified from the description, drawings, and claims of this disclosure.

[0008] One power system disclosed herein includes: a plurality of battery cells, each having an end face; an outer casing housing the plurality of battery cells, with its lower surface serving as a thermally conductive base plate thermally coupled to the end faces of the plurality of battery cells; and a cooling plate thermally coupled to a second surface of the base plate opposite to the first surface, the first surface being thermally coupled to the end faces of the plurality of battery cells. This structure has the advantage of efficiently cooling the battery cells using the cooling plate.

[0009] In another embodiment of the power system disclosed herein, the outer casing may have a fixing portion on a portion of its side, the fixing portion having threaded holes for fixing to a cooling plate, and the base plate including a protrusion that partially protrudes along the end face of the fixing portion. The above structure has the advantage of increasing rigidity in structures utilizing cooling plates to cool individual battery cells. Attached Figure Description

[0010] Figure 1 This is a schematic perspective view of a power supply system according to one embodiment of the present invention.

[0011] Figure 2 yes Figure 1 The diagram shows a schematic exploded perspective view of the power system.

[0012] Figure 3 Viewed from below Figure 1 The diagram shows a schematic exploded three-dimensional view of the power system.

[0013] Figure 4 It is a schematic top view showing the outer casing and fixing parts.

[0014] Figure 5 It is a schematic top view showing the base plate and protrusions fixed to the outer casing.

[0015] Figure 6 This is a schematic top view representing a comparative example.

[0016] Figure 7 This is a schematic top view showing the protrusions and fixing parts in other embodiments.

[0017] Figure 8 This is a schematic top view showing the protrusions and fixing parts in other embodiments.

[0018] Figure 9 This is a schematic top view showing the protrusions and fixing parts in other embodiments.

[0019] Figure 10 This is a schematic top view showing the protrusions and fixing parts in other embodiments.

[0020] Figure 11 This is a schematic top view showing the protrusions and fixing parts in other embodiments.

[0021] Figure 12 This is a schematic top view showing the protrusions and fixing parts in other embodiments.

[0022] Figure 13 This is a schematic exploded perspective view of a power supply system in other embodiments.

[0023] Figure 14This is a schematic perspective view of a power supply system in other embodiments. Detailed Implementation

[0024] Next, embodiments of the present invention will be described based on the accompanying drawings. However, the embodiments shown below are illustrative examples to concretize the technical concept of the present invention, and the present invention does not limit the power system to the power system described below. Furthermore, this specification does not limit the components shown in the claims to the components of the embodiments. In particular, regarding the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments, unless specifically limited, the purpose is not to limit the scope of the present invention to these aspects, but merely to provide illustrative examples. In addition, the size and positional relationships of the components shown in the accompanying drawings are sometimes exaggerated for clarity. Moreover, in the following description, the same names and reference numerals denote the same or similar components, and detailed descriptions are appropriately omitted. Furthermore, the elements constituting the present invention can be configured such that multiple elements are constituted using the same component, or one component can serve as multiple elements, or conversely, multiple components can be used to share and implement the function of one component. In this disclosure, the vertical direction is based on the axial direction and height direction of the battery cell.

[0025] This disclosure may also be defined by the following structures and features.

[0026] One embodiment of the power system disclosed herein includes: a plurality of battery cells, each having an end face; an outer casing that houses the plurality of battery cells and whose lower surface serves as a thermally conductive base plate thermally coupled to the end faces of the plurality of battery cells; and a cooling plate thermally coupled to a second surface of the base plate opposite to the first surface, the first surface being thermally coupled to the end faces of the plurality of battery cells.

[0027] According to the above structure, by placing a base plate with excellent thermal conductivity between the cooling plate and the end face of the battery cell, the heat dissipation of the battery cell can be improved.

[0028] In another embodiment of the power system disclosed herein, the outer casing may have a fixing portion on a portion of its side, the fixing portion having threaded holes for fixing to a cooling plate, and the base plate may include a protrusion that partially protrudes along the end face of the fixing portion. According to the above structure, the rigidity of fixing the cooling plate to the outer casing can be improved. When the base plate is shaped to only cover the bottom surface of the battery cell and the portion where the battery cell is disposed, the rigidity around the fixing portion of the battery pack is insufficient. In this shape, the base plate includes a protrusion that partially protrudes along the end face of the fixing portion, thereby allowing the protrusion to overlap with the fixing portion and increasing the rigidity of fixing the cooling plate to the outer casing. Furthermore, the base plate including the protrusion that protrudes along the end face of the fixing portion can improve the heat dissipation of the battery cell.

[0029] In another embodiment of the power supply system disclosed herein, the outer casing may have fixing portions protruding along threaded holes on opposite pairs of sides, and the base plate may have protrusions on opposite pairs of sides protruding toward both sides of the threaded holes. According to this structure, the outer casing is fixed to the cooling plate using the fixing portions on opposite pairs of sides, thereby improving the fixing strength and rigidity. Furthermore, according to this structure, the protrusions formed by a partial extension of the base plate overlap with the portions fixing the cooling plate and the outer casing, thereby improving the fixing strength and rigidity of the outer casing to the cooling plate. Additionally, in the above structure, the fixing portions protrude from the sides along the threaded holes, and the protrusions protrude toward both sides of the threaded holes, allowing the protrusions to overlap with the fixing portions near the sides of the threaded holes of the fixing portions fixed to the cooling plate, thereby improving the fixing strength and rigidity of the outer casing to the cooling plate.

[0030] In another embodiment of the power supply system disclosed herein, the outer casing may have fixing portions protruding along threaded holes on a pair of sides intersecting the length direction, and the base plate may have protrusions at its end edges in the length direction protruding toward both sides of the threaded holes. According to this structure, the outer casing has fixing portions on a pair of sides intersecting the length direction, and the base plate has protrusions at its end edges in the length direction, thereby improving the fixing strength and rigidity of the outer casing to the cooling plate. According to this structure, a portion of the base plate can extend to overlap with the portion fixing the outer casing to the cooling plate, further improving the fixing strength and rigidity of the outer casing to the cooling plate. The protrusions can protrude toward both sides of the threaded holes and overlap with the fixing portions close to the threaded holes.

[0031] In another embodiment of the power supply system disclosed herein, the base plate can be configured such that the protrusion protrudes in a plane. According to the above structure, the protrusion protrudes from the base plate in a plane, thereby not only reducing component costs but also ensuring that the protrusion and base plate are in close contact with the fixing part, outer housing, and cooling plate in a plane. The protrusion is clamped between the fixing part and the cooling plate, improving rigidity and thermal conductivity, thus balancing both.

[0032] In another embodiment of the power supply system disclosed herein, the protrusion can be fixed to the outer casing by screwing. According to the above structure, the base plate is physically and reliably fixed to the outer casing, improving rigidity. In the above structure, the bottom surface of the base plate, which closes the opening of the outer casing, is designed in a three-dimensional shape, further improving the rigidity of the outer casing. The above structure allows the protrusion to be fixed to a fixing part protruding from the side by screwing. Furthermore, the above structure utilizes screws through threaded holes in the fixing part to fix the outer casing to the cooling plate, thereby eliminating insufficient rigidity around the fixing part and ensuring sufficient strength and rigidity to support and maintain the mass of multiple battery cells.

[0033] In another embodiment of the power system disclosed herein, a portion of the protrusion may be clamped between the fixing portion and the cooling plate. In this structure, clamping at least a portion of the protrusion between the fixing portion and the cooling plate allows the outer casing to be fixed to the cooling plate, thereby improving rigidity. By using screws passing through threaded holes in the fixing portion protruding from the side of the outer casing, the protrusion, which extends from the base plate, is clamped and fixed to the cooling plate, eliminating insufficient rigidity around the fixing portion and ensuring sufficient strength and rigidity to support and maintain the mass of multiple battery cells. Furthermore, thermal conductivity is improved, balancing rigidity and thermal conductivity.

[0034] In another embodiment of the power supply system of this disclosure, the outer casing may be constructed using a separate component to form the base plate.

[0035] (Implementation Method 1)

[0036] exist Figures 1-5 , Figures 7-12 The power supply system 100 of Embodiment 1 of this disclosure is shown in the figure. Figure 1 This is a schematic 3D view of the power supply system 100. Figure 2 This is a schematic exploded perspective view of the power supply system 100. Figure 3 This is a rough exploded perspective view of the power system 100 obtained from a slightly downward angle. Figure 4 This is a schematic top view showing the outer casing 2 and the fixing part 22. Figure 5 This is a schematic top view showing the base plate 3 and the protrusion 31 fixed to the outer casing 2. Figure 6 This is a schematic top view showing a comparative example. Figures 7-12 This is a schematic top view showing the protrusion 31 and the fixing part 22 in other embodiments.

[0037] The power system 100 connects multiple rechargeable battery cells, such as lithium-ion secondary batteries, in series or in parallel for use in driving electrical equipment or electric mobile bodies such as vehicles and construction machinery, or for stationary energy storage or backup purposes.

[0038] (Power System 100)

[0039] Figures 1-3 The power system 100 includes: a plurality of battery cells 1, each having an end face; an outer casing 2 that houses the plurality of battery cells 1 and whose lower surface serves as a thermally conductive base plate 3; and a cooling plate 4 that is thermally coupled to a second surface 3b of the base plate 3 opposite to the first surface 3a (the back side of the first surface 3a), wherein the first surface 3a is thermally coupled to the lower end face of the plurality of battery cells 1.

[0040] (Battery cell 1)

[0041] Each battery cell 1 is a rechargeable secondary battery cell with a cylindrical shape and positive and negative electrode terminals at both ends. Multiple battery cells 1 are stacked to form a battery block 10. Figure 3 The battery block 10 is configured as a cuboid by arranging multiple battery cells 1 in a parallel orientation and positioning both ends on the same plane. The multiple battery cells 1 are electrically connected by lead plates, busbars, etc. Figure 3 The power system 100 uses a cylindrical battery cell 1A. The cylindrical battery 1A is arranged in a parallel position within the outer casing 2, with its electrode terminals exposed on both sides of the casing 2 and electrically connected by a lead plate. The cylindrical battery 1A houses the electrode body within a cylindrical outer casing, which is filled with electrolyte and the opening of the outer casing is sealed using a sealing plate. The bottom surface of the outer casing (which forms both end faces) and the electrode located in the center of the sealing plate serve as the positive and negative electrode terminals for the cylindrical battery 1A. Figure 3 The power system 100 uses a cylindrical battery 1A as the battery cell 1, but this disclosure does not limit the battery cell 1 to a cylindrical battery 1A; for example, it can also be a square battery 1B. Figure 13 The battery cell 1 is a non-aqueous electrolyte secondary battery cell such as a lithium-ion battery. However, this disclosure does not limit the battery cell 1 to a lithium-ion battery, and can use other non-aqueous electrolyte secondary batteries, nickel-metal hydride batteries, and all other currently used and future-developed secondary batteries. This disclosure can be used with all secondary batteries in which the cooling plate 4 is arranged opposite to the bottom surface of the battery cell 1, so that the bottom surface of the battery cell 1 can become a cooling surface.

[0042] (Outer casing 2)

[0043] The outer casing 2 houses multiple battery cells 1. The lower surface of the outer casing 2 serves as a thermally conductive base plate 3 that is thermally coupled to the end faces of the multiple battery cells 1. Figure 3 The outer casing 2 has a retainer 20 that holds multiple battery cells 1 in a predetermined position and orientation, allowing multiple battery cells 1 to be inserted into the battery storage section and arranged in a parallel orientation in a fixed position. Furthermore, the outer casing 2 stores one or more battery blocks 10 per battery pack 10, allowing multiple battery cells 1 to be arranged in a parallel orientation in a fixed position.

[0044] Figure 3 The outer casing 2 has an upper surface, a side surface 21, a lower surface that closes the opening, and a base plate 3. The side surface 21 has an inner side surface 21a facing the battery cell 1 and an outer side surface 21b on the opposite side. The outer casing 2 can also integrate the side surface 21 and the battery storage part such as the retainer 20 into one unit, or it can be set as a separate component. In addition, the outer casing 2 can be constructed using separate components for the side surface 21 and the base plate 3. The side surface 21 can be integrated with the battery storage part, for example, in... Figure 13In the case of the square battery 1B shown, connecting rods, end plates, etc., which configure multiple battery cells 1 in predetermined positions and orientations are included in the outer casing 2.

[0045] The outer housing 2 has a fixing part 22 for fixing the outer housing 2 in a predetermined position. The fixing part 22 is provided on a portion of the side 21 of the outer housing 2 and has a threaded hole 24 for fixing the outer housing 2 to the cooling plate 4. Figure 1 The outer casing 2 is a simplified example, which is set as a cuboid shape with a top surface, side surface 21, and bottom surface of a base plate 3. Figure 1 The outer casing 2 is a box-shaped structure with a rectangular upper surface, having two fixing parts 22 on each of a pair of opposite sides of the side 21. The outer casing 2 houses multiple battery cells 1. For example, the battery cells 1 can be inserted into the outer casing 2 from the bottom side of the opening. Alternatively, the box-shaped outer casing 2 can be divided into an upper casing and a lower casing to insert the battery cells 1, or the battery cells 1 can be inserted from the bottom side of the opening of the outer casing 2 integrated with the base plate 3. The outer casing 2 can be configured to house battery cells 1 or battery blocks 10. However, the shape, size, structure, and method of housing battery cells of the outer casing 2 are not limited to these. For example, the outer casing 2 can be composed of a plane, a curved surface, or a combination thereof, and the outer surface can be provided with protrusions, grooves, steps, inclined surfaces, etc., depending on the size and shape of the battery blocks and the shape of the main body side carrying the power system.

[0046] (Fixed part 22)

[0047] Figure 1 The fixing part 22 fixes the outer housing 2 to the cooling plate 4. The fixing part 22 is provided on the side 21 of the outer housing 2. Figure 1 The fixing part 22 is provided on the outer side 21b of the side 21 of the outer housing 2. Figure 1 The fixing part 22 is designed as a convex shape that protrudes outward from the side 21. This fixing part 22 ensures that the thickness of the side 21 is constant or within a certain range, guaranteeing that the cuboid (rectangular) shape serves as the battery storage shape within the side 21. This helps to suppress and reduce material and manufacturing costs, while maintaining and improving the rigidity of the device, achieving high output. However, the side 21 can be thickened only in the area where the fixing part 22 is provided, or the fixing part 22 can be provided on the inner side 21a of the side 21.

[0048] This disclosure does not limit the shape, size, or structure of the fixing part 22. For example, the horizontal cross-sectional shape of the fixing part 22 can be set as triangular. Figure 4 , Figure 5 , Figure 9 ),quadrilateral( Figure 10 ), trapezoid ( Figure 7), polygons, or half or a segment of any of these shapes, except for a semicircle ( Figure 8 Besides regular shapes such as ellipses and semi-ovals, irregular shapes can also be used. In this disclosure, the shape includes approximate shapes. The outer surface of the fixing part 22 can be a plane, a curved surface, or a combination of a plane and a curved surface. For example, the corners of the fixing part 22 can be chamfered, and it can also be configured to match the shape and arrangement of the threaded sleeve 26. Furthermore, the portion of the fixing part 22 that connects to the side surface 21 can be a curved surface. Figure 12 Furthermore, the bottom surface 23 of the fixing part 22 can be flat, or it can be provided with steps, protrusions, grooves, inclinations, etc. The bottom surface 23 of the fixing part 22 can be configured to match the shape and arrangement of the threaded sleeve 26. For example, the bottom surface 23 of the fixing part 22 can be configured such that the bottom surface of the threaded sleeve 26 is positioned lower than the bottom surface other than the threaded sleeve 26, so that the protrusion 31 described later protrudes to both sides of the threaded sleeve 26 (threaded hole 24). In addition, the bottom surface of the threaded sleeve 26 and the bottom surface of the protrusion 31 can be set to the same height, or they can be set to different heights. By configuring the bottom surface 23 of the fixing part 22 to match the shape of the connecting and fixing cooling plate 4, the outer housing 2 can be stably fixed, and the fixing strength can be improved.

[0049] Figure 4 The fixing part 22 has a triangular bottom surface 23 and a horizontal cross-sectional shape. A threaded sleeve 26 is arranged in the central region of the fixing part 22, and the apex (top 22b) of the triangle is curved due to the thickness of the threaded sleeve 26. This fixing part 22 is designed to match the shape of the threaded sleeve 26 (threaded hole 24), ensuring the fixing strength of the outer housing 2 with a predetermined thickness. Furthermore, Figure 1 The fixing part 22 is set as a triangular prism with the same horizontal cross-sectional shape as the bottom surface 23, but the fixing part 22 can be set as a different horizontal cross-sectional shape or a partially different horizontal cross-sectional shape than the bottom surface 23. For example, by setting the bottom surface 23 to have a larger area than the opposite upper surface or middle layer cross-section, the fixing strength and rigidity of the outer casing 2 can be further improved.

[0050] The fixing part 22 has: a connecting part 22a on the root side for connecting the fixing part 22 to the outer housing 2; and a top part 22b on the top side of the fixing part 22, which protrudes to the maximum extent from the connecting part 22a and is furthest away from the connecting part 22a. The fixing part 22 is connected to the outer housing 2 by means of the connecting part 22a. Figure 4 The fixing part 22 is shaped such that the length (L1) of the connecting part 22a that connects to the outer housing 2 in the bottom surface 23 is longer than the length (L2, which is the length of the curved line in the figure) of the top part 22b. Figure 4The fixing part 22 has a triangular shape for its bottom surface 23, tapering from the relatively wide connecting part 22a side to the narrower top part 22b side. Because the connecting part 22a is wider than the top part 22b, the fixing part 22, with its wider connecting part 22a, clamps the bottom plate 3 (protrusion 31) between itself and the cooling plate 4. This allows the area near the side 21 to be fixed to the cooling plate 4 along with the side 21. This extremely simple structure efficiently improves the fixing strength and rigidity of the outer casing 2. Furthermore, as... Figure 12 As shown, by making the connecting part 22a side of the fixing part 22 a smooth curved surface and further increasing the length (L1) of the connecting part 22a on the root side, it is possible to further improve the fixing strength and rigidity of the outer casing 2.

[0051] The convex fixing part 22 protruding outward from the side 21 can accommodate the protrusion 31 (described later) overlapping with the fixing part 22 on the base plate 3. The protrusion 31 can increase the area of ​​the base plate 3, which is clamped and fixed between the battery cell 10 and the cooling plate 4. In particular, the area of ​​the connecting part 31a on the root side, which is connected to the fixing part 22 in the same way, can be increased, allowing clamping by the fixing part 22, the side 21, and the cooling plate 4. Furthermore, the protrusion 31 can be fixed to the fixing part 22 by providing a threaded hole 34 and engaging a screw 35. These mutually cooperate, and the base plate 3, which is fixed between the multiple battery cells 1 and the cooling plate 4, is firmly fixed to the outer housing 2, which can efficiently improve the rigidity of the power system 100 with a simple structure.

[0052] Figure 4 The fixing part 22 has a threaded hole 24 through which a screw or shaft (hereinafter referred to as screw 25) passes. The outer housing 2 is fixed to the cooling plate 4 by means of the screw 25 passing through the threaded hole 24. The threaded hole 24 can be provided with an internal thread portion or a shaft hole by pressing a spacer or nut into the sleeve of the molded article during or after molding, so that the screw 25 can pass through and fix the outer housing 2 to the cooling plate 4. Figure 4 The threaded hole 24 is provided in the central region 29 of the fixing part 22. The central region 29 refers to the area outside the outer periphery including the center or center of gravity of the fixing part 22. Figure 4 The fixing part 22 has a threaded sleeve 26 and a threaded sleeve connecting part 27 that connects the threaded sleeve 26 to the outer housing 2. A threaded hole 24 is provided in the threaded sleeve 26. Figure 4 The threaded sleeve connecting portion 27 is connected to the outer edge of the threaded sleeve 26, connecting the threaded sleeve 26 to the outer housing 2. It is formed by two triangles on the connecting portion 22a side that supports and fixes the threaded sleeve 26. The two triangular threaded sleeve connecting portions 27 connect the threaded sleeve 26 to the outer housing 2. Each fixing portion 22 can be provided with one or more threaded holes 24. Figure 11This illustrates an example of a fixing portion 22 with two threaded holes 24. When multiple threaded holes 24 are provided in the fixing portion 22, the multiple threaded holes 24 can be provided at intervals, or they can be provided close together. As the area of ​​the fixing portion 22 with multiple threaded holes 24 increases, the area of ​​the protrusion 31 can also be increased, allowing for a variety of threaded holes 34 to be provided.

[0053] The outer housing 2 may have one or more fixing parts 22 on its side 21. The outer housing 2 has fixing parts 22 on each of a pair of opposing side 21, thereby enabling the fixing parts 22 to be arranged on the opposite ends of the side 21 separated by one side, effectively improving the fixing strength of the outer housing 2. When the side 21 of the outer housing 2 is rectangular, fixing parts 22 may be provided on either or both of the opposite pair of short-side side 21 or the opposite pair of long-side side 21. Similarly, in the case of a square, fixing parts 22 may be provided on any of the opposite pair of side 21. The outer housing 2 may have fixing parts 22 protruding along threaded holes 24 on each of a pair of side 21 intersecting the length direction. The outer housing 2 may have one or more fixing parts 22 on each of its opposing side 21. Figure 4 As shown, in particular, the outer casing 2 has a plurality of (in) on opposite sides 21. Figure 4 The fixing parts 22 (two in the middle) are arranged at or near the corners of the side surface 21. By arranging multiple fixing parts 22 at intervals close to the diagonal of the side surface 21, the fixing parts 22 can be arranged at positions near the two ends of the diagonal, thereby improving the fixing strength of the outer casing 2 more efficiently. The improvement in the fixing strength of the three-dimensional outer casing 2 is related to the improvement in the rigidity of the power supply system. The corner refers to the area between the corner of a face of the side surface 21 and the center of a face of the side surface 21 near the corner.

[0054] Figure 2 The fixing part 22 fixes the outer housing 2 to the cooling plate 4. However, the fixing part 22 can also fix the outer housing 2 to a component other than the cooling plate 4. For example, the fixing part can fix the outer housing 2 to the housing, or it can fix the outer housing 2 to both the housing and the cooling plate 4. In addition, when a pair of outer housings 2 are arranged with the cooling plate 4 in between, the fixing part 22 can fix each outer housing 2 to each other, or it can fix each outer housing 2 to the cooling plate 4. Figure 14 ).

[0055] Figure 2 The outer housing 2 is fixed to the cooling plate 4 by fastening (screwing) the fixing part 22 with the screw 25. Figure 2The fixing part 22 has a threaded hole 24 through which a screw 25 passes. The outer housing 2 is fixed to the cooling plate 4 by means of the screw 25 passing through the threaded hole 24. The screw 25 through the threaded hole 24 of the fixing part 22 engages with the cooling plate 4, which can easily and firmly fix the outer housing 2. The method of fixing the outer housing 2 to the cooling plate 4 by means of the screw engagement of the fixing part 22 can reliably fix the outer housing 2 to the cooling plate 4 by clamping the base plate 3 between the multiple battery cells 1 arranged in a predetermined position of the outer housing 2 and the cooling plate 4. Moreover, by means of the screw engagement of the outer housing 2 with the cooling plate 4 by means of the fixing part 22, the tightness between the two is enhanced and fixed, which can improve the fixing strength of the base plate 3 clamped between the multiple battery cells 1 housed in the outer housing 2 and the cooling plate 4, and can improve the rigidity of the clamped base plate 3. Furthermore, by ensuring good thermal coupling between the end faces of multiple battery cells 1 and the base plate 3, and between the base plate 3 and the cooling plate 4, thermal conductivity is improved, preventing and suppressing the reduction in cooling performance, thus achieving a balance between rigidity and thermal conductivity. In addition, the fixing part 22 can fix the outer casing 2 using methods other than screwing.

[0056] (Base plate 3)

[0057] A base plate 3 is disposed below multiple battery cells 1, between the multiple battery cells 1 and a cooling plate 4. The base plate 3 has a first surface 3a thermally coupled to the end faces of the multiple battery cells 1 and a second surface 3b thermally coupled to the cooling plate 4 on the side opposite to the first surface 3a. The first surface 3a and the second surface 3b can be shaped to correspond to the shape of the thermally coupled objects. The base plate 3 serves as both a component that supports the multiple battery cells 1 and strengthens the outer casing 2 to increase rigidity, and a heat-conducting component that conducts heat emitted from the multiple battery cells 1 to the cooling plate 4 and dissipates heat to the outside. By clamping the base plate 3 between the battery block 10 and the cooling plate 4 and reliably fixing it in a stable state, the base plate 3 supports the battery block 10 from below, reducing the burden on the cooling plate 4, which directly bears the weight of the battery block 10, and improving the rigidity of the power system. The base plate 3 is made of a material and has a thickness that allows it to support the battery block 10 from below and reduce the burden on the cooling plate 4, and its structure is appropriately configured according to the mass of the battery block 10. Furthermore, by constructing the base plate 3 to have thermal conductivity, the reduction in the cooling performance of the cooling plate 4 can be suppressed and reduced even when the base plate 3 is sandwiched in, thus achieving a structure that balances the rigidity and thermal conductivity of the base plate 3. The base plate 3 is preferably a component with high thermal conductivity, such as aluminum, copper, or an alloy containing any of these materials.

[0058] (Protrusion 31)

[0059] The base plate 3 includes a protrusion 31 that partially protrudes along the end face of the fixing portion 22. The base plate 3 has a base plate body 30, which is the main body of the base plate 3, and the protrusion 31 located at the periphery of the base plate body 30. The protrusion 31 extends outward relative to the inner side surface 21a of the side surface 21 of the connected outer housing 2. The protrusion 31 is the portion that extends outward relative to the inner side surface 21a of the side surface 21 of the outer housing 2. By having the protrusion 31 on the base plate 3, the outer housing 2 can be fixed to the cooling plate 4 by clamping the protrusion 31 between the fixing portion 22 of the outer housing 2 and the cooling plate 4, thereby improving the fixing strength and rigidity. This is because, apart from the thickness of the side surface 21, the outer housing 2 can be fixed to the cooling plate 4 by clamping the protrusion 31 that extends outward from the side surface 21.

[0060] Figure 5 The protrusion 31 extends further outward than the outer surface 21b of the side surface 21 of the connected outer casing 2. This further increases the area of ​​the protrusion 31. The larger area of ​​the protrusion 31 improves thermal conductivity. Therefore, the protrusion 31 easily absorbs heat from the multiple battery cells 1 and conducts it to the cooling plate 4, thereby maintaining the cooling performance of the cooling plate 4. Furthermore, the protrusion 31, extending outward from the outer surface 21b of the side surface 21, can extend towards the outer edge where no battery cells 1 are located. Additionally, the protrusion 31 is horizontally away from the bottom surface of the multiple battery cells 1, thereby improving the heat dissipation and efficiency of the multiple battery cells 1 located near the side surface 21 and prone to heat accumulation.

[0061] This disclosure does not limit the shape, size, or structure of the protrusion 31. For example, the protrusion 31 can have a horizontal cross-sectional shape of one or more triangles. Figure 5 , Figure 9 ),quadrilateral( Figure 10 ), trapezoid ( Figure 7 ), polygons, or half or a segment of any of these shapes, except for a semicircle ( Figure 8 Besides regular shapes such as ovals and semi-ovals, irregular shapes can also be used. Each shape contains an approximate general shape. The protrusion 31 can be formed by arranging or connecting multiple shapes of the same or different shapes. Figure 5 The protrusion 31 is designed as a structure connecting two linearly symmetrical triangles (two peaks). The outer surface of the protrusion 31 can be a plane, a curved surface, or a combination of a plane and a curved surface. For example, the corners of the protrusion 31 can be chamfered, and it can also be designed to match the shape and configuration of the threaded sleeve 26. Furthermore, the connecting portion 31a of the protrusion 31 can be a curved surface. Each protrusion 31 can have one or more threaded holes 34. Figure 5The protrusion 31 causes a portion of the base plate 3 to protrude along the end face of the fixing part 22. The protrusion 31 is shaped to protrude to both sides of the threaded hole 24 of the fixing part 22, and threaded holes 34 are provided on both sides of the threaded hole 24. Figure 5 Each protrusion 31 is located near both sides of the threaded hole 24, and threaded holes 34 are opened at two locations. Figure 5 The protrusion 31 is configured as two triangles connected around the threaded sleeve 26 (threaded hole 24) of the fixing part 22, and the two triangles on both sides of the threaded hole 24 each have a threaded hole 34 at one point.

[0062] Figure 5 The protrusion 31 is surrounded by the threaded hole periphery 36 around the threaded hole 24, the fixing outer edge 37 along the outer edge of the fixing part 22, and the connecting part 31a at the root side where the protrusion 31 connects to the base plate body 30. The threaded hole periphery 36 is an arc-shaped curve along the circular threaded hole 24 or the threaded sleeve 26. The fixing outer edge 37 consists of two triangles on the left and right sides of the connecting part 31a as the base. The left hypotenuse of the left triangle and the right hypotenuse of the right triangle are arranged along the outer edge of the triangular fixing part 22 (the hypotenuses of the approximate left and right triangles of the threaded sleeve connecting part 27), and the right hypotenuse of the left triangle and the left hypotenuse of the right triangle are connected along the outer edge of the threaded sleeve 26. This structure ensures the connection strength of the threaded sleeve 26 and balances rigidity and thermal conductivity. Figure 5 The protrusion 31 is designed as two triangles connected by the arc-shaped threaded hole periphery 36.

[0063] The protrusion 31 has: a connecting portion 31a on the root side, which connects the protrusion 31 to the base plate body 30; and a top portion 31b on the top side of the protrusion 31, which protrudes to the maximum extent from the connecting portion 31a and is furthest away from the connecting portion 31a. The protrusion 31 is connected to the base plate body 30 by means of the connecting portion 31a. Figure 5 The protrusion 31 is shaped such that the length (W1) of the connecting portion 31a connected to the base plate body 30 is longer than the length (W2, which is the length of the curved line in the figure) of the top portion 22b on the top side of the protrusion 31. For Figure 5Regarding the protrusion 31, two triangles connect near the base of the connecting portion 31a to form a relatively wide connecting portion 31a. Each triangle is designed to narrow at the apex, moving from the connecting portion 31a towards the narrower apex portion 31b (vertex side). Because the connecting portion 31a is wider than the apex portion 31b, the wider connecting portion 31a can be clamped, allowing the area near the side 21 to be fixed together with the side 21. This extremely simple structure contributes significantly to the efficient improvement of rigidity. The connecting portion 31a on the root side can be clamped between the fixing portion 22 and the cooling plate 4 with a larger area. Furthermore, a space for a threaded hole 34 can be formed in or near the connecting portion 31a. The protrusion 31 protrudes towards both sides of the threaded hole 24, close to both sides of the threaded hole 24. A threaded hole 34 is provided in the connecting part 31a, and it is fixed by screwing in the screws 35, thereby efficiently improving the fixing strength and rigidity of the base plate 3 and the outer housing 2. The base plate 3 is fixed to the outer housing 2 by screwing the protrusion 31 and the fixing part 22 with screws 35, and then the outer housing 2 is fixed to the cooling plate 4 by screwing in the screws 25 of the fixing part 22, thereby efficiently improving the rigidity of the power system 100. This is because, in particular, the area near the connecting part 31a is prone to vibration, which has a significant impact on rigidity. Furthermore, similar to the fixing part 22, as... Figure 12 As shown, by making the connecting portion 31a side of the protrusion 31 a smooth curved surface and further increasing the length (W1) of the connecting portion 31a on the root side, it is possible to further improve the rigidity of the power supply system 100.

[0064] Furthermore, the protrusion 31 increases the area of ​​the base plate 3. In particular, the protrusion 31 is located at the periphery of the base plate body 30, protruding outward from the connecting portion 31a, which is close to the battery block 10 and has a significant impact on heat dissipation, thereby improving thermal conductivity. Moreover, by protruding along the end face of the fixing portion 22, the increase in material cost caused by the increased area of ​​the base plate 3 is minimized, and the protrusion is designed to contribute significantly to both rigidity and thermal conductivity. This structure achieves a balance between rigidity and thermal conductivity.

[0065] The protrusion 31 overlaps at least partially with the bottom surface 23 of the fixing part 22 when viewed from above. For example, the protrusion 31 can overlap by more than 10%, preferably more than 20%. The larger the overlap area, the larger the contact area between the base plate 3 and the outer casing 2. In particular, the protrusion 31 at the outer edge of the base plate 3 can expand the contact area with the fixing part 22 near the side 21, thereby improving the fixing strength of the base plate 3 between the battery block 10 housed in the outer casing 2 and the cooling plate 4. Furthermore, the greater the overlap, the larger the space for the threaded hole 34 in the protrusion 31, allowing the screw 35 to be threaded into the protrusion 31 and fixed to the fixing part 22, thus improving the fixing strength of the base plate 3 and consequently increasing the rigidity of the power system 100. In addition, by increasing rigidity, the thermal conductivity of the base plate 3 can be improved in a stable, sealed state, achieving a balance between rigidity and thermal conductivity.

[0066] In the connecting portion 31a of the protrusion 31, for example, the connecting portion 31a can overlap with the bottom surface 23 of the contacting fixing portion 22 by more than 60%, preferably more than 70%, more preferably more than 80%, and most preferably overlap with the bottom surface 23 of the fixing portion 22 in a range where the two ends of the connecting portion 31a of the protrusion 31 do not protrude. The reason for this is that by having a larger width (area) for the connecting portion 31a on the root side connected to the base plate body 30, the bottom surface 23 of the fixing portion 22 overlaps with the protrusion 31, which is more efficient in improving rigidity and thermal conductivity than near the top portion 31b side, thus achieving a balance between the two.

[0067] The protrusion 31 can be configured to match the shape of the bottom surface 23 of the fixing part 22. Figure 5 The protrusion 31 is disposed within the area of ​​the bottom surface 23 of the fixing part 22. In this power system 100, the protrusion 31 does not protrude beyond the area of ​​the bottom surface 23 of the fixing part 22, which can efficiently improve and balance rigidity and thermal conductivity. It can suppress the increase in material cost of the base plate 3, and can also help improve rigidity and thermal conductivity, and further contribute to the compactness of the power system 100. However, the protrusion 31 can be larger than the bottom surface 23 of the fixing part 22, and can also be configured to protrude beyond the area of ​​the bottom surface 23 of the fixing part 22. In addition, the protrusion 31 can be provided outside the threaded hole 24 or outside the threaded sleeve 26. By Figure 5 The protrusion 31 is provided on the outer periphery of the screw sleeve 26, which can maintain the flatness of the contact surface of the screw sleeve 26 and maintain the tightness of the screw 25.

[0068] Figure 5The base plate 3 is fixed to the outer housing 2. The base plate 3 in the figure is screwed and fixed to the outer housing 2 using screws 35. By screwing the base plate 3 to the outer housing 2, the rigidity of the power system 100 can be improved. The base plate 3 is fixed by threads at predetermined positions and intervals on the side 21 and inside of the outer housing 2. For example, Figure 5 The base plate 3, except for the four corners of its rectangular shape, is screwed in at four locations along its long edge and two locations along its short edge (a total of 16 locations). Furthermore, each protrusion 31, close to and protruding to both sides of the threaded holes 24 of the four fixing parts 22, is screwed in at two locations on each side of the threaded holes 24. In total, the base plate 3 is screwed into the side surface 21 of the outer casing 2 at 24 locations. The base plate 3 is firmly fixed to the outer casing 2, thus becoming the base plate that closes the bottom surface 23 of the outer casing 2. The three-dimensional shape of the outer casing 2 and the base plate 3 improves rigidity and reduces the weight burden on the battery block 10 applied to the cooling plate 4.

[0069] exist Figure 5 In the middle, the protrusion 31 is fixed to the fixing part 22 by screwing. The protrusion 31 can be provided with a threaded hole 34, and the threaded hole 34 can also be provided at a position corresponding to the protrusion 31. Figure 5 The protrusion 31 protrudes to both sides of the threaded hole 24. Threaded holes 34 are formed in the connecting part 31a near both sides of the threaded hole 24. All or part of the threaded hole 34 is located within the area of ​​the protrusion 31, allowing the screws 35 that fix the base plate 3 to the outer housing 2 to be screwed into the threaded hole 24 near the connecting part 31a and near the fixing part 22. This effectively increases the natural vibration frequency and stiffness. The base plate 3 is fixed to the fixing part 22 (outer housing 2) by screwing into the protrusion 31, and then fixed to the cooling plate 4 by screwing into the fixing part 22. This improves the fixing strength and stiffness. When the outer housing 2 is screwed onto the cooling plate 4, the protrusion 31, which partially extends from the base plate 3, is clamped, and then the protrusion 31 is screwed into the fixing part 22, thus reliably fixing the clamped base plate 3 physically and improving the stiffness of the clamped base plate 3. In addition, the threaded hole 34 of the protrusion 31 and the screw 35 are screwed in a shape and manner that do not hinder thermal coupling with the cooling plate 4 and the tight fit between the base plate 3 and the cooling plate 4.

[0070] Figure 5 The protrusion 31 contacts and is fixed to the fixing part 22. The contact and fixation of the protrusion 31 to the fixing part 22 ensures a secure fixation and improves rigidity. The protrusion 31 is screwed together, increasing both the fixing strength and the tightness of the fit. This improves thermal conductivity by ensuring good thermal coupling between the end faces of the multiple battery cells 1 and the base plate 3, and between the base plate 3 and the cooling plate 4. It also prevents and suppresses the reduction in cooling performance, achieving a balance between rigidity and thermal conductivity in the power system 100 with the base plate 3 clamped in place.

[0071] Implementation method 1 is carried out by analyzing the resonant frequency (natural vibration frequency). Figure 5 ) and comparative example ( Figure 6 A comparison of implementation methods 1 and 2. Figure 5 In the comparative example, the base plate 3 has a protrusion 31 that overlaps with the fixing part 22, and the protrusion 31 is fixed to the fixing part 22 by screwing in the screw 35. In contrast, in the comparative example ( Figure 6 In this case, the base plate 3 does not have a protrusion 31, nor is it threaded with a screw 35. In any case, except for the presence or absence of the protrusion 31 and the presence or absence of the screw 35, the following conditions are set: the number of battery cells 1 is 160, the weight is 20 kg, and two fixing parts 22 are provided on each of the opposite short side sides 21 of the outer casing 2, for a total of 4 fixing parts 22. In addition, in any case, the base plate 3 is fixed to the outer casing 2 by 16 threaded engagements near the periphery, except for the threading of the protrusion 31. For the natural vibration frequency in the vertical direction (up and down direction), the comparative example ( Figure 6 ) is around 100Hz, in contrast, implementation method 1 ( Figure 5 A value of 200Hz or higher was obtained. In Implementation Method 1 ( Figure 5 In the figure, the base plate 34 is provided with four protrusions 31, each protruding to both sides of the threaded hole 24. Each portion protruding to both sides of the threaded hole 24 is fixed to the fixing part 22 by screwing in screws 35. Based on the above values, a significant increase in rigidity is confirmed. For the base plate 3, slightly increasing the amount of the protrusions 31 and screwing in screws 35 at the illustrated position can suppress the increase in component cost and manufacturing cost, and the effect of greatly improving rigidity is extremely high, making the cost-effectiveness very high. The power supply system 100 of this disclosure, through this increase in rigidity, can suppress the vertical vibration of the weighted battery block 10. Furthermore, in the heat dissipation measurement test, the results of Embodiment 1 (…) are also obtained. Figure 5 Comparison example () Figure 6 The preferred result is that the presence of the protrusion 31 improves thermal conductivity, resulting in good adhesion between the base plate 3 and the bottom surface of the battery block 10, good adhesion between the base plate 3 and the cooling plate 4, and good thermal coupling. In addition, the suppression of vibration in the vertical direction of the battery block 10 also helps to stabilize the cooling performance of the cooling plate 4.

[0072] The base plate 3 may have one or more protrusions 31. The base plate 3 may have no more than the same number of protrusions 31 as the fixing part 22. Figure 5 The base plate 3 is provided with the same number of protrusions 31 as the fixing part 22, and each protrusion 31 is arranged in the same position as each fixing part 22, so that the multiple protrusions 31 overlap with the bottom surface 23 of the fixing part 22.

[0073] The base plate 3 in the figure causes the protrusion 31 to protrude in the same plane. This not only reduces the cost of the component, but also allows the protrusion 31 to be tightly clamped with the fixing part 22 and the cooling plate 4, thereby improving the fixing strength and rigidity of the outer casing 2.

[0074] Figures 7-12 Other embodiments are shown. The basic form compared to other embodiments is... Figure 5 In this design, the fixing part 22 is shaped like a triangle, and a threaded hole 24 is provided in the central region 29. The protrusion 31 is shaped like two triangles matching the fixing part 22, and a threaded hole 34 is provided in each triangle. Figure 7 In this case, the fixing part 22 is set as a trapezoid, such that the length (L2) of the top part 22b is greater than that of the middle part 22b. Figure 5 It is long. It can increase the area of ​​the protrusion 31 by lengthening the connecting portion 22a of the lower base of the trapezoid. Figure 8 In this design, the fixing part 22 is shaped as a semicircle, and the protrusion 31 is shaped to follow the periphery of the threaded sleeve 26 and match the shape of the fixing part 22. The protrusion 31 can protrude outwards from the outermost point of the threaded sleeve 26, and can also have two or more threaded holes 34. Figure 9 In the middle, the fixing part 22 is set to be more than Figure 5 A large triangle has a threaded hole 24 in its central region 29. The protrusion 31 is a triangle matching the shape of the fixing part 22, protruding outwards from the outermost point of the threaded sleeve 26. An additional threaded hole 34 is provided near the vertex of the two threaded holes 34 on the base side of the triangle. Figure 10 In this design, the fixing part 22 is a quadrilateral, with a threaded hole 24 in the central region 29. The protrusion 31 is a quadrilateral that matches the shape of the fixing part 22, protruding outwards from the outermost point of the threaded sleeve 26, and a total of four threaded holes 34 are provided near the four corners of the quadrilateral. Figure 11 In the middle, the two threaded holes 24 of the fixing part 22 are opened at intervals, and the protrusion 31 is designed to match the shape of the fixing part 22, and has three threaded holes 34. Figures 9-11 In the middle, the protrusion 31 can be more securely fixed by engaging the screws 35 at 3 or 4 points. Figure 12 In this design, the two ends of the connecting portion 22a of the fixing portion 22 are extended to both sides, and the length (L1) of the connecting portion 22a on the root side is increased by providing a smooth curved surface. The protrusion 31 is designed to match the shape of the fixing portion 22. The shape and size of the efficient protrusion 31 can be determined based on the shape of the fixing portion 22. Based on the shape and size of the fixing portion 22 and the protrusion 31, one or more threaded holes 24 can be provided in the fixing portion 22, and one or more threaded holes 34 can be provided in the protrusion 31.

[0075] (Insulating sheet 6)

[0076] Figure 2 The power system 100 also includes an insulating sheet 6 between the cooling plate 4 and the battery block 10. Figure 2 An insulating sheet 6 is sandwiched between the battery block 10 and the cooling plate 4. The insulating sheet 6 is made of a material with excellent insulation and thermal conductivity. By sandwiching the insulating sheet 6 between the battery block 10 and the cooling plate 4, electrical insulation is achieved between the battery block 10 and the cooling plate 4. In particular, when the outer can of the battery cell 1 is made of metal, and consequently the cooling plate 4 is also made of metal, insulation is required to prevent conductivity on the bottom surface of the battery cell 1. For example, insulation can be achieved by covering the surface of the outer can with heat shrink tubing, and the insulating sheet 6 is sandwiched to further improve insulation, thereby enhancing safety and reliability. The insulating sheet 6 preferably has a certain degree of elasticity; for example, acrylic, polyurethane, epoxy, and silicone resins are suitable materials. By making the insulating sheet 6 elastic, the surface of the insulating sheet 6 can be elastically deformed to eliminate gaps at the contact surface between the battery block 10 and the cooling plate 4, resulting in good thermal coupling. One or more insulating sheets can be sandwiched. In addition to sheets, the insulating sheet 6 can be made of films, slurries, etc. To reliably maintain thermal conductivity and even insulation, multiple insulating sheets 6 can be sandwiched in place by adding a membrane or the like. Insulating sheets 6 are not always necessary; they can be omitted if sufficient insulation can be achieved.

[0077] (Cooling plate 4)

[0078] The cooling plate 4 is a heat sink used to conduct heat from the heated battery cells 1 to the outside. The cooling plate 4 is thermally coupled to the second surface 3b of the base plate 3. In the power system 100, heat emitted from multiple battery cells 1 is conducted to the cooling plate 4 via the base plate 3 and dissipated to the outside, thereby cooling the battery cells 1. The cooling plate 4 may be equipped with refrigerant piping, for example. The cooling plate 4 may have a built-in refrigerant piping, such as copper or aluminum, for circulating liquefied refrigerant as a coolant, i.e., a cooling pipe, as a heat exchanger. The cooling pipe is thermally coupled to the upper panel of the cooling plate 4, for example, and a heat-insulating material is provided between it and the base plate to provide thermal insulation between them. In addition to providing the cooling function of refrigerant, the cooling plate 4 may also be made of a metal plate alone. For example, it may be a metal body with excellent heat dissipation and thermal conductivity, such as one with heat sink fins. Alternatively, it may not be limited to metal and may use heat-conducting sheets with insulation properties.

[0079] (Implementation Method 2)

[0080] Figure 13 This refers to the power supply system 200 of embodiment 2. Figure 13The power system 200 is identical to Embodiment 1, except that the battery cell 1 is a square battery 1B and the outer casing 2 has connecting rods, end plates, fastening members, etc., for arranging multiple square batteries 1B in predetermined positions and orientations. For example, the outer casing 2 can be made of metal or the like to have sufficient strength, thereby fixing the end plates to the outer casing 2 to fasten the battery block 10. This structure enables the miniaturization of the power system 200 by using the outer casing 2 as a fastening member.

[0081] (Implementation Method 3)

[0082] Figure 14 This refers to the power supply system 300 of embodiment 3. Multiple power supply systems 100 and 200 shown in embodiments 1 and 2 can be combined. For example, Figure 14 The power system 300 has a cooling plate 4 disposed between one outer housing 2. A cooling plate 4 is disposed on the lower surface side of each outer housing 2, separated by a base plate 3. One or more cooling plates 4 can be disposed, and the same or different cooling plates 4 can be disposed.

[0083] Industrial availability

[0084] This disclosure can be usefully used in a device for cooling multiple high-output and heavy secondary battery cells using a cooling plate as a power system that can efficiently cool the secondary battery cells using a cooling plate, or as a power system that improves rigidity, or as a power system that balances rigidity and thermal conductivity. In addition, it can be usefully used in equipment or apparatus that carry any of these.

[0085] Explanation of reference numerals in the attached figures

[0086] 100, 200, 300, Power System; 1. Battery Cell; 1A. Cylindrical Battery; 1B. Square Battery; 2. Outer Housing; 3. Base Plate; 3a. First Surface; 3b. Second Surface; 4. Cooling Plate; 5. Cooling Mechanism; 6. Insulating Sheet; 10. Battery Block; 20. Retaining Component; 21. Side Surface; 21a. Inner Side Surface; 21b. Outer Side Surface; 22. Fixing Part; 22a. Connecting Part; 22b. Top Part; 23. Bottom Surface; 24. Threaded Hole; 25. Screw; 26. Screw Sleeve; 27. Screw Sleeve Connecting Part; 29. ​​Central Area; 30. Base Plate Body; 31. Protrusion; 31a. Connecting Part; 31b. Top Part; 34. Threaded Hole; 35. Screw; 36. Peripheral Part of Threaded Hole; 37. Outer Edge of Fixing Part.

Claims

1. A power supply system, wherein, The power system includes: Multiple battery cells, each with an end face; An outer casing housing the plurality of battery cells, with the lower surface of the outer casing serving as a thermally conductive base plate thermally coupled to the end faces of the plurality of battery cells; and A cooling plate is thermally coupled to a second side of the base plate opposite to the first side, which is thermally coupled to the end face of the plurality of battery cells.

2. The power supply system according to claim 1, wherein, The outer housing has a fixing part, and a threaded hole for fixing to the cooling plate is partially formed on the side of the fixing part. The base plate includes a protrusion, a portion of which protrudes along the end face of the fixing portion.

3. The power supply system according to claim 2, wherein, The outer housing has the fixing part protruding along the threaded hole on a pair of opposite sides. The base plate has protrusions on opposite sides of the threaded hole.

4. The power supply system according to claim 2, wherein, The outer housing has the fixing part protruding along the threaded hole on a pair of sides intersecting the length direction. The base plate has protrusions at its longitudinal edges that extend toward both sides of the threaded hole.

5. The power supply system according to claim 2, wherein, The base plate causes the protrusions to project in the same plane.

6. The power supply system according to claim 2, wherein, The protrusion is fixed to the outer housing by screwing.

7. The power supply system according to any one of claims 2 to 6, wherein, A portion of the protrusion is clamped between the fixing part and the cooling plate.

8. The power supply system according to claim 7, wherein, The outer casing is constructed from a single component to form the base plate.

9. A power supply system, wherein, The power system includes: Multiple battery cells; An outer casing that houses the plurality of battery cells; and Cooling plate, Each individual battery cell has an end face. The outer casing houses the plurality of battery cells. A base plate is included on the first side of the outer casing. The base plate is a thermally conductive component that is thermally coupled to the end face of each of the plurality of battery cells. The base plate includes a first surface and a second surface opposite to the first surface of the base plate. The first surface of the base plate is thermally coupled to the end face of each of the plurality of battery cells. The cooling plate is thermally coupled to the second surface of the base plate.

10. The power supply system according to claim 9, wherein, The outer housing includes a second surface that intersects with the first surface of the outer housing, and a fixing portion is included on the second surface of the outer housing. The fixing part includes an end face, and a threaded hole for fixing to the cooling plate is formed on the end face of the fixing part. The base plate includes a third surface, including at least one protrusion that protrudes from the third surface of the base plate in a manner opposite to the end face of the fixing portion, the third surface of the base plate intersecting the first surface of the base plate and the second surface of the base plate.

11. The power supply system according to claim 10, wherein, The outer housing has a fixing portion protruding around the threaded hole on a pair of opposing second surfaces of the second surface of the outer housing in a direction orthogonal to the second surface of the outer housing. The base plate includes a pair of opposing third surfaces, which comprise the third surfaces of the base plate. At least two protrusions are respectively made on the opposite pair of third surfaces to protrude toward both sides of the threaded hole, the at least two protrusions including the at least one protrusion.

12. The power supply system according to claim 11, wherein, The outer casing is a cuboid with the first side being rectangular. The pair of opposing second faces of the outer casing are faces that intersect the length direction of the outer casing. The base plate includes at least two protrusions at its end edge in the longitudinal direction.

13. The power supply system according to claim 10, wherein, The base plate causes at least two protrusions to project in the same plane, the at least two protrusions including the at least one protrusion.

14. The power supply system according to claim 10, wherein, The base plate includes threaded holes. The at least one protrusion provided on the end edge of the base plate is fixed to the outer housing by screwing into the threaded hole of the base plate.

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