Battery pack and method of manufacturing the same

Abstract

The battery pack includes: a secondary battery cell having a cell first main surface, a cell second main surface opposite the cell first main surface, and a pair of cell side surfaces connecting the cell first main surface and the cell second main surface; a resin frame having a pair of frame wall portions covering at least the pair of cell side surfaces of the secondary battery cell; a first metal plate portion joined to the frame in a first connection structure and fixed to the cell first main surface of the secondary battery cell via a first adhesive; and a second metal plate portion joined to the frame in a second connection structure and fixed to the cell second main surface of the secondary battery cell via a fixing unit. The second connection structure is configured to allow the second plate portion to displace between the pair of frame wall portions in a direction away from the first plate portion in a state in which the secondary battery cell is swollen.

Description

Technical Field

[0001] This disclosure relates to battery packs and methods for manufacturing them. Background Technology

[0002] Battery packs containing rechargeable secondary battery cells, such as lithium-ion secondary batteries, are used in various applications as power sources to drive devices (e.g., Patent Document 1). In such battery packs, it is known that lithium-ion batteries expand due to charging and discharging.

[0003] However, there is also the possibility that the expansion may cause the battery pack to look less attractive, or that problems may arise in the connection between the terminals of the secondary battery cells and the terminals of the battery pack.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: JP Patent No. 3851277 Summary of the Invention

[0007] One objective of this disclosure is to provide a battery pack that can be used reliably even when the secondary battery cells expand, and a method for manufacturing the same. Another objective is to provide a battery pack and a method for manufacturing the same that minimizes the aesthetic degradation caused by the expansion of the secondary battery cells. Furthermore, the description of these objectives and objectives does not preclude the existence of other objectives and objectives. Moreover, one aspect of this disclosure does not need to solve all of these objectives. Furthermore, objectives beyond these can be extracted from the description, drawings, and claims of this disclosure.

[0008] One aspect of this disclosure relates to a battery pack comprising: a secondary battery cell having a first main surface, a second main surface opposite to the first main surface, and a pair of side surfaces connecting the first and second main surfaces; a resin frame having a pair of frame walls covering at least the pair of side surfaces of the secondary battery cell; a first metal plate connected to the frame by a first connecting structure and fixed to the first main surface of the secondary battery cell via a first adhesive; and a second metal plate connected to the frame by a second connecting structure and fixed to the second main surface of the secondary battery cell via a fixing unit, the second connecting structure being configured to allow the second plate to displace away from the first plate between the pair of frame walls when the secondary battery cell is expanded.

[0009] Furthermore, in other battery pack manufacturing methods, the battery pack comprises: a secondary battery cell having a first main surface, a second main surface opposite to the first main surface, and a pair of side surfaces connecting the first and second main surfaces; a resin frame having a pair of frame walls covering at least the pair of side surfaces of the secondary battery cell; a first metal plate fixed to the frame and covering the first main surface of the secondary battery cell; and a second metal plate covering the second main surface of the secondary battery cell. The battery pack manufacturing method includes the following steps: sliding the first plate between the pair of frame walls of the frame to connect the frame and the first plate; inserting the secondary battery cell between the pair of frame walls of the frame; fixing the first main surface of the secondary battery cell to the first plate via a first adhesive; and fixing the second plate to the second main surface of the secondary battery cell via a fixing unit.

[0010] According to one aspect of the battery pack disclosed herein, a first plate is fixed to the first side of the secondary battery cell and to the frame, while the second plate is not fixed to the frame. Thus, even if the secondary battery cell expands and the thickness between the two sides increases, deformation can be tolerated by displacing the second plate accordingly. Attached Figure Description

[0011] Figure 1 This is a perspective view of the battery pack involved in Embodiment 1.

[0012] Figure 2 Viewed from below at an angle Figure 1 A 3D view of the battery pack.

[0013] Figure 3 yes Figure 1 An exploded 3D view of the battery pack.

[0014] Figure 4 yes Figure 1 A three-dimensional cross-sectional view of the battery pack at line IV-IV.

[0015] Figure 5 Viewed from the back Figure 1 An enlarged 3D view of the battery pack.

[0016] Figure 6 yes Figure 5 An exploded 3D view of the battery pack.

[0017] Figure 7 It is an exploded perspective view showing the state of the frame with the first plate inserted.

[0018] Figure 8Viewed from below at an angle Figure 7 An exploded 3D diagram.

[0019] Figure 9 It means in Figure 7 An exploded 3D view of the frame with the secondary battery cells installed.

[0020] Figure 10 It means in Figure 9 An exploded perspective view of the secondary battery cell with the second plate fixed in place.

[0021] Figure 11 This is a three-dimensional view of the battery pack involved in the modified example.

[0022] Figure 12 yes Figure 11 An exploded 3D view of the battery pack.

[0023] Figure 13 This is an exploded perspective view showing the assembly process of the battery pack involved in the modified example.

[0024] Figure 14 yes Figure 1 A three-dimensional cross-sectional view of the battery pack at line XIV-XIV.

[0025] Figure 15 yes Figure 1 A schematic cross-sectional view of the battery pack.

[0026] Figure 16 It means Figure 15 A schematic cross-sectional view of the battery pack in an expanded state.

[0027] Figure 17 yes Figure 1 A three-dimensional cross-sectional view of the battery pack at line XVII-XVII.

[0028] Figure 18 yes Figure 1 A three-dimensional cross-sectional view of the battery pack at the XVIII-XVIII line.

[0029] Figure 19 This is a perspective view of the battery pack involved in Embodiment 2.

[0030] Figure 20 yes Figure 19 An exploded 3D view of the battery pack.

[0031] Figure 21 Viewed from the back Figure 19 An enlarged 3D view of the battery pack.

[0032] Figure 22 yes Figure 21 An exploded 3D view of the battery pack.

[0033] Figure 23 yes Figure 19 A three-dimensional cross-sectional view of the battery pack at line XXIII-XXIII.

[0034] Figure 24 yes Figure 19 A three-dimensional cross-sectional view of the battery pack at line XXIV-XXIV.

[0035] Figure 25 This is a perspective view of the battery pack involved in Embodiment 3.

[0036] Figure 26 yes Figure 25 An exploded 3D view of the battery pack.

[0037] Figure 27 Viewed from the back Figure 25 An enlarged 3D view of the battery pack.

[0038] Figure 28 yes Figure 27 An exploded 3D view of the battery pack.

[0039] Figure 29 Viewed from a diagonal angle Figure 26 A 3D view of the second panel sliding into the frame.

[0040] Figure 30 It means from Figure 29 A perspective view showing the state in which the second plate slot insert is positioned in the guide recess.

[0041] Figure 31 yes Figure 25 A three-dimensional cross-sectional view of the battery pack at line XXXI-XXXI.

[0042] Figure 32 yes Figure 25 A three-dimensional cross-sectional view of the battery pack at line XXXII-XXXII.

[0043] Figure 33 yes Figure 25 A three-dimensional cross-sectional view of the battery pack at line XXXIII-XXXIII.

[0044] Figure 34 This is a perspective view of the battery pack involved in Embodiment 4.

[0045] Figure 35 Viewed from below at an angle Figure 34 A 3D view of the battery pack.

[0046] Figure 36 yes Figure 34 An exploded 3D view of the battery pack.

[0047] Figure 37 Viewed from the back Figure 34 An enlarged 3D view of the battery pack.

[0048] Figure 38 yes Figure 37 An exploded 3D view of the battery pack.

[0049] Figure 39 yes Figure 34 A three-dimensional cross-sectional view of the battery pack at line XXXIX-XXXIX.

[0050] Figure 40 This is a perspective view of the battery pack involved in Embodiment 5.

[0051] Figure 41 yes Figure 40 An exploded 3D view of the battery pack.

[0052] Figure 42 yes Figure 41 Further exploded perspective view of the battery pack.

[0053] Figure 43 Viewed from the back Figure 41 An enlarged 3D view of the battery pack.

[0054] Figure 44 yes Figure 43 An exploded 3D view of the battery pack.

[0055] Figure 45 yes Figure 41 A three-dimensional cross-sectional view of the battery pack at the XLV-XLV line.

[0056] Figure 46 yes Figure 41 A three-dimensional cross-sectional view of the battery pack at the XLVI-XLVI line.

[0057] Figure 47 yes Figure 41 A three-dimensional cross-sectional view of the battery pack along the XLVII-XLVII line.

[0058] Figure 48 yes Figure 41 A three-dimensional cross-sectional view of the battery pack at the XLVIII-XLVIII line.

[0059] Figure 49 It means Figure 42 A 3D view of the battery pack's frame. Detailed Implementation

[0060] The manner of this disclosure can be determined through the following structure and features.

[0061] In other embodiments of the battery pack disclosed herein, the fixing unit is an adhesive label wound around the perimeter of a cell assembly. The cell assembly covers the first main surface of each secondary battery cell with a first plate portion, covers the second main surface of each cell with a second plate portion, and covers the side surfaces of the pair of cells with the frame. This structure improves insulation, and the use of the label covering the edges of the first and second plate portions enhances safety.

[0062] Furthermore, in any of the other embodiments of the battery pack disclosed herein, the fixing unit is a second adhesive bonded between the second main surface of the secondary battery cell and the first surface of the second plate portion on the side opposite to the second main surface of the cell. With this structure, the second plate portion can be easily fixed to the second main surface of the cell using the second adhesive bond, allowing the second plate portion to follow the expansion of the secondary battery cell.

[0063] Furthermore, in any of the aforementioned embodiments of the battery pack disclosed herein, the second connecting structure is configured such that, when the secondary battery cell is in a contracted state from an expanded state, the second plate portion is allowed to displace towards the first plate portion between the pair of frame wall portions. With this structure, if the secondary battery cell returns from an expanded state to a contracted state, the second plate portion can be laterally displaced to restore its original state.

[0064] Furthermore, in any of the aforementioned embodiments of the battery pack disclosed herein, the second connecting structure includes a displacement constraint unit that constrains the displacement of the second plate portion in a direction away from the first plate portion. With this structure, even if the secondary battery cell expands, the displacement can be constrained by the displacement constraint unit to prevent the secondary battery cell from detaching from the frame.

[0065] Furthermore, in any of the battery packs disclosed in other embodiments, the second plate portion has a second plate sidewall on its long side, and the pair of frame walls of the frame form frame guide portions on their outer surfaces to guide the lower surface of the second plate sidewall. The displacement constraint unit consists of a second plate slot insertion piece at least partially formed on the second plate sidewall and a frame second protrusion that is separated upwards from and at least partially formed above the frame guide portion. This configuration ensures that if the second plate slot insertion piece displaces upwards, the frame second protrusion interferes. With this structure, when the secondary battery cell expands and the second plate portion needs to displace upwards, at a certain position, the second plate slot insertion piece interferes with the frame second protrusion, thereby constraining further displacement.

[0066] Furthermore, in any of the battery packs disclosed in other embodiments, the frame guide portion, while the second plate portion is connected to the frame body, forms a guide recess below the location where the second frame protrusion is provided, with a width equal to or larger than that of the second frame protrusion. With this structure, the installation operation of mounting the second plate portion to the frame body can be performed easily by inserting it from the middle for locking, even without moving it along the entire length of the frame body.

[0067] Furthermore, in any of the above-mentioned battery packs, the first plate portion has at least partially a first plate sidewall on its side in the long side direction, and at least one of its end faces in the long side direction is made flat. The first connecting structure is implemented by a sliding mechanism that allows the first plate sidewall of the first plate portion to slide on the surfaces of the pair of frame wall portions of the frame.

[0068] Furthermore, in any of the aforementioned embodiments of the battery pack disclosed herein, the sliding mechanism comprises a first sliding groove formed along the long side direction on the outer surface of the pair of frame walls of the frame, and a folding tab that can be inserted into the first sliding groove to fold back the end edge of the first plate sidewall of the first plate portion. With this structure, the design of the folding tab formed on the sidewall of the first plate, which is made of metal, is easily achieved.

[0069] Furthermore, in any of the aforementioned embodiments of the battery pack, the second connecting structure includes wall protrusions formed on the pair of frame wall portions of the frame.

[0070] Furthermore, in other embodiments of the present disclosure, the battery pack has a curved edge on the first plate portion in any of the aforementioned embodiments. This structure prevents the edge from protruding from the leading edge of the metal first plate portion, thus avoiding contact with the edge by the user's hand and improving safety.

[0071] Furthermore, in other embodiments of the present disclosure, the battery pack has a curved edge on the second plate portion in any of the aforementioned embodiments. This structure provides the advantage that even if the secondary battery cells expand, the interior of the battery pack is difficult for the user to see.

[0072] Furthermore, in any of the above-mentioned methods of manufacturing a battery pack, the first plate insertion end, which is flat on one of the long-side end faces of the first plate sidewalls formed by bending the long-side sides of the first plate portion, approaches the long-side end face of the frame, and the first plate sidewall of the first plate portion slides on the outer surface of the pair of frame wall portions of the frame to perform the process of connecting the frame and the first plate portion.

[0073] Furthermore, in other embodiments of the present disclosure, the battery pack, in any of the aforementioned embodiments, involves inserting a folding tab that folds back the end edge of the first plate sidewall of the first plate portion into a first sliding groove formed along the long side direction on the outer surface of the pair of frame wall portions of the frame, and sliding it to perform the process of connecting the frame and the first plate portion. This provides the advantage of simplifying the design of the folding tab formed on the sidewall of the first plate of the metal first plate.

[0074] The embodiments of this disclosure will now be described based on the accompanying drawings. However, the embodiments shown below are merely illustrative examples to concretize the technical concept of this disclosure, and this disclosure is not limited to them. Furthermore, this specification does not limit the components shown in the claims to the components of the embodiments. In particular, unless specifically described, the dimensions, materials, shapes, and relative arrangements of the structural components described in the embodiments are not intended to limit the scope of this disclosure, but are merely illustrative examples. In addition, the size, positional relationships, etc., of the components shown in the drawings are sometimes exaggerated for clarity. Furthermore, in the following description, the same names and reference numerals denote the same or homogeneous components, and detailed descriptions are appropriately omitted. Furthermore, the elements constituting this disclosure can also be configured such that one component serves as multiple elements, or conversely, multiple components can share the function of one component.

[0075] The battery pack disclosed herein can be used as a power source for portable electronic devices such as smartphones, tablets, music players, and game consoles. Furthermore, it can be used as a power source for portable electrical devices such as wireless devices, electric vacuum cleaners, and power tools. Alternatively, it can be used as a power source for mobile devices such as electric bicycles, electric trolleys, and electric scooters. Moreover, it can be used in stationary energy storage applications as a backup power source for servers, for home use, business premises, and factories. Furthermore, it can be used as a power source for vehicles such as hybrid vehicles and electric vehicles. Hereinafter, as an embodiment of this disclosure, a battery pack used as a power source for a game console will be described.

[0076] [Implementation Method 1]

[0077] exist Figures 1 to 18 The battery pack 100 according to Embodiment 1 of this disclosure is shown. In these figures, respectively, Figure 1 A perspective view of the battery pack 100 according to Embodiment 1 is shown. Figure 2 Showing a view from below. Figure 1 A 3D view of the battery pack 100. Figure 3 Show Figure 1 Exploded perspective view of battery pack 100 Figure 4 Show Figure 1 A three-dimensional cross-sectional view of the battery pack 100 at line IV-IV. Figure 5 Shown from the rear view Figure 1 A magnified 3D view of the battery pack 100. Figure 6 Show Figure 5 Exploded perspective view of battery pack 100 Figure 7 An exploded perspective view is shown showing the state in which the first plate portion 30 is inserted into the frame 20. Figure 8 Showing a view from below. Figure 7 Decomposed 3D diagram, Figure 9 The diagram shows that... Figure 7 An exploded perspective view of the frame 20 with the secondary battery cell 10 installed. Figure 10 The diagram shows that... Figure 9 An exploded perspective view of the secondary battery cell 10 with the second plate fixed in place. Figure 11 A perspective view of the battery pack 100' involved in the modified example is shown. Figure 12 Show Figure 11 An exploded perspective view of the 100' battery pack. Figure 13 An exploded perspective view is shown illustrating the assembly process of the battery pack 100' involved in the modified example. Figure 14 Show Figure 1 A three-dimensional cross-sectional view of the battery pack 100 at line XIV-XIV. Figure 15 Show Figure 1 A schematic cross-sectional view of the battery pack 100. Figure 16 Showing the representation Figure 15 A schematic cross-sectional view of the battery pack 100 in an expanded state. Figure 17 Show Figure 1 A three-dimensional cross-sectional view of the battery pack 100 at the XVII-XVII line. Figure 18 Show Figure 1 A three-dimensional cross-sectional view of the battery pack 100 at the XVIII-XVIII line. (See image below.) Figure 1 , Figure 2 As shown, the battery pack 100 is designed in a plate-like shape. Figure 3As shown, the battery pack 100 is composed of a secondary battery cell 10, a frame 20, a first plate portion 30, and a second plate portion 40. In this way, instead of housing the secondary battery cell 10 in an outer casing such as plastic, it is held by the frame 20, thereby enabling the battery pack 100 to be miniaturized and thinned.

[0078] (10 secondary battery cells)

[0079] The secondary battery cell 10 uses a type known as a prismatic laminated battery or pouch battery. This secondary battery cell 10 primarily utilizes lithium-ion secondary batteries, but is not limited to this; prismatic secondary battery cells can also be used. The prismatic secondary battery cell 10 has: a first main surface 11; a second main surface 12 opposite to the first main surface 11; and a pair of side surfaces 13 connecting the first main surface 11 and the second main surface 12. Figure 3 In the example, the first main surface 11 of the cell forms the lower surface, and the second main surface 12 of the cell forms the upper surface. Furthermore, the secondary battery cell 10 is provided with positive and negative electrodes.

[0080] (Frame 20)

[0081] The frame 20 primarily covers the single-side surface 13 of the secondary battery cell 10. The frame 20 is formed into a ring with a rectangular frame shape, creating a space 21 within it for housing the secondary battery cell 10. Furthermore, the frame 20 has a pair of frame wall portions 22 covering at least one pair of single-side surfaces 13 of the secondary battery cell 10. The pair of frame wall portions 22 connect their ends to each other. Figure 3 In the example shown, the frame 20 includes: a pair of frame wall portions 22; a front frame portion 23 connecting one end of the pair of frame wall portions 22 to each other; and a back frame portion 24 connecting the other ends of the pair of frame wall portions 22 to each other. Protrusions, threaded holes, etc., for fixing and positioning can be formed in these front frame portions 23 and back frame portions 24 as needed. Furthermore, as... Figure 2 As shown, an external electrode 15 may be provided on the front face portion 23 of the frame. The external electrode 15 is connected to the electrode of the secondary battery cell 10. Such a frame 20 is made of a material with excellent insulation, heat resistance, and weather resistance. Preferably, the pair of frame wall portions 22, the front face portion 23, and the back face portion 24 constituting the frame 20 are integrally molded from resin or the like. The resin constituting the frame 20 can be polycarbonate (PC), polyamide (PA), polypropylene (PP), ABS resin, etc.

[0082] (Part 1, Section 30)

[0083] The first plate portion 30 is connected to the frame 20 by a first connecting structure. Furthermore, the first plate portion 30 is fixed to the first main surface 11 of the secondary battery cell 10 via a first adhesive 50. The first plate portion 30 is preferably made of a metal sheet. For example, SUS or iron with a surface coating can be used as the metal material constituting the first plate portion 30.

[0084] (First plate sidewall 32)

[0085] The first plate portion 30 has at least partially a first plate sidewall 32 on its side along its long side. Figure 3 In the example, a first plate sidewall 32 is integrally provided on both sides. The first plate sidewall 32 is formed by bending the two ends of the first plate portion 30 of the metal plate at approximately right angles. Furthermore, by making the bent portion curved, edges are avoided from forming at the end edges, and damage can be avoided even if the corners come into contact with other components during the assembly of the battery pack 100.

[0086] (First plate insertion end 33)

[0087] Furthermore, at least one end face of the first plate portion 30 along its long side is designated as a flat first plate insertion end 33. Thus, using the sliding mechanism of the first connecting structure described later, the first plate portion 30 can be slidably connected to the frame 20 from the first plate insertion end 33. Additionally, the term "flat" for the first plate insertion end 33 does not need to be a completely flat surface; it can be formed as curved surfaces on several end faces. For example, as... Figure 4 As shown, by forming several curved surfaces on the first plate insertion end 33, which is the end face of the first plate portion 30 in the long side direction, the resin frame 20 is slightly deformed, allowing it to be inserted into the first plate insertion end 33 from the back side portion 24 of the frame. Furthermore, by providing curved surfaces on the first plate insertion end 33 in this way, it is possible to prevent the edge from being exposed on the end face, thus avoiding contact between the end face and other components during battery assembly 100 and preventing damage. In addition, as will be described later, it has the following concealing effect: by bending the end face downwards, it is difficult to observe the internal state of the secondary battery cell 10 when it expands and the second plate portion 40 floats up, making it visible from the end face.

[0088] Furthermore, the other side of the long side end face of the first plate portion 30, that is, the surface opposite to the first plate insertion end 33, is designated as the first plate end face wall 34. For example... Figure 5 As shown, the same wall as the side wall 32 of the first plate can also be formed on the end face wall 34 of the first plate.

[0089] (First Company Structure)

[0090] The first plate portion 30 and the frame 20 are provided with a first connecting structure for connecting them. The first connecting structure can utilize a sliding mechanism that allows the first plate sidewall 32 of the first plate portion 30 to slide on the surfaces of a pair of frame wall portions 22 of the frame 20. Specifically, as Figure 5 , Figure 6 As shown, a first sliding groove 25 is formed on the outer surface of the frame wall portion 22 along the long side direction. The first sliding groove 25 extends from the rear end of the frame wall portion 22 along the long side direction to the front of the frame front portion 23. Due to the formation of the first sliding groove 25, a first frame protrusion 26 is formed at the lower end of the frame wall portion 22, which protrudes to the side in a cross-sectional view intersecting the long side direction.

[0091] (Insert piece 35 into the first slot)

[0092] Furthermore, the first plate sidewall 32 of the first plate portion 30 further folds back its end edge to form a first plate slot insertion piece 35 that can be inserted into the first sliding groove 25. Thus, by inserting the first plate slot insertion piece 35 into the first sliding groove 25 and allowing it to slide in, the first plate portion 30 can be connected to the frame 20. When the first plate portion 30 is slid into the frame 20, as... Figure 7 , Figure 8 As shown, the first plate insertion end 33, which serves as the end face of the long side of the first plate portion 30, is inserted across the lower surface of the frame back side portion 24 of the first plate portion 30. Then, the first plate groove insertion piece 35 is inserted into the first sliding groove 25 and pushed forward, i.e., into the frame front side portion 23. Finally, the first plate groove insertion piece 35 abuts against the end face of the first sliding groove 25. In this way, the first plate portion 30 can be connected to the frame body 20 without the use of screws or other components. The bottom surface of the portion forming the first sliding groove 25 of the frame wall portion 22 is thinner than the thickness of the first plate, so that when the first plate portion 30 is inserted into the frame body 20, the bottom surface of the frame front side portion 23 and the bottom surface of the first plate portion 30 are planar. Furthermore, regarding the thickness of the frame wall portion 22, the area forming the first sliding groove 25 is made thinner than the thickness of the first plate, so that when the first plate portion 30 is inserted into the frame body 20, the side surface of the frame front portion 23 and the side wall 32 of the first plate are planar. Thus, by simultaneously constructing the frame body 20 and the first plate portion 30 as two components and focusing on these joining mechanisms, it is possible to avoid the increase in thickness and size caused by the addition of joining mechanisms, thereby maintaining the miniaturization and thinness of the battery pack 100.

[0093] [Battery Pack Manufacturing Method]

[0094] Here, the manufacturing method of the battery pack 100 is described. First, secondary battery cell 10, first plate 30, second plate 40, and frame 20 are prepared. In this state, the first plate 30 is slid between a pair of frame wall portions 22 of the frame 20 to connect the frame 20 and the first plate 30. Here, as... Figure 7 As shown, the first plate insertion end 33 of the first plate portion 30 is inserted from the back side 24 of the frame 20 and slid in. At this time, as... Figure 8 As shown, the resin frame 20 is slightly deformed so that several curved surfaces formed on the first plate insertion end 33 extend across the back surface 24 of the frame. In this state, the first plate slot insertion piece 35 is inserted into the first sliding groove 25 and slides in.

[0095] Next, as Figure 9 As shown, a secondary battery cell 10 is inserted between a pair of frame wall portions 22 of the frame 20, and the first main surface 11 of the secondary battery cell 10 is fixed to the first plate portion 30 via a first adhesive 50. The first adhesive 50 can be pre-attached to the side of the first main surface 11 of the secondary battery cell 10, or it can be attached to the first plate portion 30.

[0096] Furthermore, such as Figure 10 As shown, the second plate portion 40 is fixed to the second main surface 12 of the secondary battery cell 10 via a fixing unit. Here, double-sided tape is used as the fixing unit. The fixing unit of the double-sided tape can be pre-attached to the second main surface 12 of the secondary battery cell 10, or it can be attached to the second plate portion 40.

[0097] In this way, by fixing the first plate portion 30 to the frame 20, while not fixing the second plate portion 40 to the frame 20, deformation can be allowed even if the secondary battery cell 10 expands and its thickness increases between the two sides by moving the second plate portion 40 to the side.

[0098] (First adhesive 50)

[0099] The first adhesive 50 can be suitably made of double-sided tape. The double-sided tape is preferably thin. For example, the thickness of the double-sided tape is set to 0.1 mm to 1.0 mm. The substrate constituting the double-sided tape can be polyester film, polyethylene film, polypropylene film, cloth, metal foil, etc. Furthermore, the adhesive coated on both sides of the substrate can be polyethylene-based, epoxy-based, silicone-based, polyurethane-based, etc.

[0100] (Second section, page 40)

[0101] The second plate portion 40 is connected to the frame 20 by a second connecting structure. Furthermore, the second plate portion 40 is fixed to the second main surface 12 of the secondary battery cell 10 via a fixing unit. Additionally, the side of the second plate portion 40 opposite to the second main surface 12 of the cell is referred to as the second plate first surface 41. The second plate portion 40 is preferably made of a metal sheet. More preferably, the first plate portion 30 and the second plate portion 40 are made of the same metal sheet.

[0102] The second plate portion 40 has a second plate sidewall 42 on its side along its long side. Furthermore, a second plate endwall 44 may also be formed on its end face along its long side. Figure 3 In the example shown, a second plate sidewall 42 is formed on the side of the second plate portion 40 in the long side direction, and on one of the end faces in the long side direction ( Figure 3 Example of forming the second plate end face wall 44 (right side). By bending the end edge of the second plate portion 40 in this way, the end edge of the second plate portion 40 of the metal plate can be prevented from being exposed to the outside, and the risk of damage to the edge of the end edge during assembly or contact with other components can be reduced. In addition, as described later... Figure 17 , Figure 18 As shown, it also has the following concealing effect: by bending the end edge, it makes it difficult to observe the internal state of the secondary battery cell 10 when the secondary battery cell 10 expands and the second plate portion 40 floats up.

[0103] (Fixed unit)

[0104] The fixing unit secures the second plate portion 40 to the second main surface 12 of the secondary battery cell 10. This fixing unit utilizes a second adhesive 60 bonded between the second main surface 12 of the secondary battery cell 10 and the first surface 41 of the second plate portion 40. This second adhesive 60 allows the second plate portion 40 to be easily fixed to the second main surface 12 of the cell, enabling the second plate portion 40 to follow the expansion of the secondary battery cell 10. The second adhesive 60 can be double-sided tape.

[0105] The fixing unit is not limited to the second adhesive body 60. For example, as a fixing unit, an adhesive label 65 wrapped around the periphery of the cell assembly 1, which covers the first main surface 11 of the secondary battery cell 10 with a first plate portion 30, covers the second main surface 12 of the cell with a second plate portion 40, and covers a pair of side surfaces with a frame body 20, can also be used. Taking such an example as the battery pack 100' involved in the modified example, in Figure 11 , Figure 12The following is shown. In these variations, the same reference numerals are used for the same components as in Embodiment 1, and detailed descriptions are appropriately omitted. The label 65 is preferably made of an insulating component such as paper or resin. When the battery assembly 1 is assembled with the secondary battery cell 10, the frame 20, the first plate portion 30, and the second plate portion 40, the label 65 is wrapped around the battery assembly 1. This not only makes it easy to fix the second plate portion 40 to the secondary battery cell 10, but also allows the battery assembly to be held integrally without being limited to the second plate portion 40. Furthermore, by covering most of the area of ​​the metal first plate portion 30 and the second plate, insulation can be improved. Moreover, regarding the metal first plate portion 30 and the second plate portion 40, if the edges become sharp, they may be scratched during assembly or when in contact with other components. However, by covering them with the label 65, the advantage of suppressing edge exposure and improving safety can be obtained.

[0106] Additionally, regarding the illustration of label 65, in Figure 12 In the example of the exploded perspective view, the label 65 is shown in a bent state for ease of drawing. However, in actual assembly, the label is followed according to known label pasting procedures, such as bending the label 65 while it is unfolded in a planar state.

[0107] Thus, the fixing unit can utilize the second adhesive 60 and the label 65. Either the second adhesive 60 or the label 65 can be used, or both can be used. Furthermore, not limited to Embodiment 1, in the following embodiments, either or both of the second adhesive 60 and the label 65 can be used as the fixing unit. However, for ease of explanation, only one side will be illustrated.

[0108] The manufacturing method of the battery pack 100' using tag 65 for fixing unit is as follows. The process of preparing secondary battery cell 10, first plate 30, second plate 40, and frame 20, connecting frame 20 and first plate 30, and fixing the first main surface 11 of secondary battery cell 10 to first plate 30 via first adhesive 50 is the same as described above. Figure 7 , Figure 9 The steps are the same as those shown. Next, as... Figure 13 As shown, with the secondary battery cell 10, frame 20, first plate 30, and second plate 40 assembled into a cell assembly 1, a tag 65 is wrapped around the cell assembly 1 to fix the second plate 40 to the second main surface 12 of the secondary battery cell 10 via a fixing unit. This allows the second plate 40 to be easily fixed to the secondary battery cell 10.

[0109] (Second Company Structure)

[0110] The second connecting structure is configured such that, when the secondary battery cell 10 is expanded, the second plate portion 40 is allowed to move away from the first plate portion 30 between the pair of frame wall portions 22. Thus, by fixing the first plate portion 30 to the first surface of the secondary battery cell 10, and not fixing the second plate portion 40 to the frame 20, even if the secondary battery cell 10 expands and its thickness increases between the pair of sides, deformation can be tolerated by correspondingly displacing the second plate portion 40.

[0111] It is known that individual secondary battery cells expand during charging and discharging. Generally, they expand during charging and contract to return to their original shape during discharging. Therefore, it is desirable to have the property that even if the battery pack temporarily expands, it will return to its original shape when it contracts. However, if it is housed in a metal casing, the temporarily expanded and deformed metal plate cannot return to its original shape and remains bulging, resulting in a poor appearance. Furthermore, this also has an adverse effect on the interface with the device that uses the battery pack. Therefore, it is desirable to have a structure in which the first and second metal plates do not deform when the secondary battery cells expand.

[0112] In this embodiment, such as Figure 14 As shown in the cross-sectional view, the first plate portion 30 is configured to be fixed to the first main surface 11 of the secondary battery cell 10, and the second plate portion 40 is configured to displace during expansion. In this configuration, the first plate portion 30 is fixed to the frame 20, while the second plate portion 40 is not fixed to the frame 20, allowing displacement through a second connecting structure. That is, as... Figures 15 to 16 As shown in the schematic cross-sectional view, even if the thickness of the second plate portion 40 increases between the pair of sides due to the expansion of the secondary battery cell 10, the second plate portion 40 is still allowed to shift away from the first plate portion 30 between the pair of frame wall portions 22. Furthermore, for the purpose of explanation, Figure 15 , Figure 16 The schematic cross-sectional view is shown to easily show the differences such as the thickness of the secondary battery cell 10, and the size is exaggerated in the illustration.

[0113] In addition, regarding the construction of the second connecting structure, such as Figures 16 to 15 As shown, if the secondary battery cell 10 is in a state of contraction from an expanded state, the second plate portion 40 is allowed to move towards the first plate portion 30 between the pair of frame wall portions 22. That is, corresponding to the secondary battery cell 10 returning to a contracted state from an expanded state, the second plate portion 40 can be moved laterally in the opposite direction to restore its original state.

[0114] (Gate 19 on the frame)

[0115] In the second connecting structure, for example, the upper groove 19 of the second plate sidewall 42 can be inserted by forming grooves that open upwards in a pair of frame wall portions 22 of the frame body 20. Figure 14 In the example of the cross-sectional perspective view, the frame wall portion 22 protrudes in an L-shape when viewed from the outer surface cross-section to form the frame upper groove portion 19. The width of the groove in the frame upper groove portion 19 is approximately the same as or slightly narrower than the second plate sidewall 42, so that the second plate sidewall 42 of the second plate portion 40 can be inserted. By integrally forming the frame body 20 that forms the frame upper groove portion 19 using a flexible resin or the like, the second plate sidewall 42 can be pressed into the frame upper groove portion 19 to connect the second plate portion 40 to the frame body 20. Furthermore, by opening the frame upper groove portion 19 upward and allowing the second plate sidewall 42 to protrude downward, the second plate portion 40 can be moved in the up-and-down direction.

[0116] Furthermore, the second connecting structure can be provided not only along the long side of the second plate portion 40 but also along its short side. That is, a frame groove 19 for inserting into the end wall 44 of the second plate portion 40 can also be provided on the front frame portion 23 and the back frame portion 24. Figure 17 In this example, the frame is configured such that a groove 19 is formed on the back side 24 of the frame, into which the second plate end wall 44 of the second plate portion 40 is inserted. Alternatively, the first plate end wall 34 may also be configured to form a wall surface similar to the first plate side wall 32, such that the front end is bent to cover the first protrusion 26 of the frame. Furthermore, in this example, as... Figure 18 As shown, no upper groove is formed on the front face 23 of the frame.

[0117] (Displacement-constrained element)

[0118] Furthermore, the second connecting structure can also have a displacement constraint unit that restricts the displacement of the second plate portion 40 in a direction away from the first plate portion 30. Even if the secondary battery cell 10 expands, the displacement can be restricted by the displacement constraint unit to prevent the secondary battery cell 10 from falling off the frame 20.

[0119] [Implementation Method 2]

[0120] Taking such an example as the battery pack 200 involved in implementation method 2, in Figures 19-24 As shown. In these figures, Figure 19 A perspective view of the battery pack 200 according to Embodiment 2 is shown. Figure 20 Show Figure 19 Exploded 3D view of battery pack 200. Figure 21 Shown from the rear view Figure 19 A magnified 3D view of the 200 battery pack. Figure 22 Show Figure 21 Exploded 3D view of battery pack 200. Figure 23 Show Figure 19 A three-dimensional cross-sectional view of the battery pack at line XXIII-XXIII of battery pack 200. Figure 24 Show Figure 19A perspective cross-sectional view of the battery pack 200 at line XXIV-XXIV. In these drawings, the same reference numerals are used for components identical to those in Embodiment 1 described above, and detailed descriptions are appropriately omitted. For example... Figure 19 As shown, the battery pack 200 according to Embodiment 2 also has a plate-like shape. Furthermore, as... Figure 20 As shown, the battery pack 200 includes a first plate portion 30, a second plate portion 40B, and a frame 20B.

[0121] (Second slot insert piece 45)

[0122] In this battery pack 200, the second connecting structure includes a displacement constraint unit. The displacement constraint unit constrains the amount of displacement of the second plate portion 40B in a direction away from the first plate portion 30. The second plate portion 40B at least partially forms a second plate groove insertion piece 45 on the second plate sidewall 42B, serving as the displacement constraint unit. Figures 21-23 In the example shown, the second plate slot insert 45 is formed over the entire area of ​​the second plate sidewall 42B.

[0123] (Frame guide section 29)

[0124] On the other hand, such as Figure 22 As shown, a pair of frame wall portions 22B of the frame body 20B form frame guide portions 29 on their outer surfaces to guide the lower surface of the second plate side wall 42B. The frame guide portions 29 are separated from the upper ends of the frame wall portions 22B and extend along the long side direction of the frame wall portions 22B in the middle of the frame wall portions 22B. A first sliding groove 25 is formed in the lower part of the frame wall portions 22B.

[0125] (Second protrusion 28 of the frame)

[0126] Furthermore, at the upper end of the frame wall portion 22B, a second frame protrusion 28 is formed, which protrudes laterally when viewed in a cross-section intersecting the long side direction. The second frame protrusion 28 is separated upwards from the frame guide portion 29 and is formed at least partially. Figure 20 , Figure 22 In the example, the second protrusion 28 of the frame is integrally formed on the outer surface of the frame wall portion 22B along the long side direction of the frame body 20B. Furthermore, in Figure 22 , Figure 23 In the example, a first frame protrusion 26 is formed on the lower end of the outer surface of the frame wall portion 22B, and a second frame protrusion 28 is formed on the upper end. These first frame protrusions 26 and second frame protrusions 28 are separated from the frame guide portion 29, and a first sliding groove 25 and a second sliding groove 27 are formed between them, respectively. Regarding the frame body 20B, it slides into the frame body 20B as with the first plate portion 30 to connect with the second plate portion 40B. That is, as... Figure 21 , Figure 23As shown, the second plate slot insertion piece 45 of the second plate portion 40B is inserted into the second sliding groove 27, so that the second plate portion 40B is slidably connected along the long side direction of the frame 20B. At this time, the frame guide portion 29 guides the lower end of the second plate slot insertion piece 45.

[0127] The second protrusion 28 of the frame functions as a displacement constraint unit. If the second plate slot insertion piece 45 moves upward when the second plate portion 40B is installed in the frame 20B, the second protrusion 28 interferes at a certain height. With this structure, when the secondary battery cell 10 expands and the second plate portion 40B is about to move upward, the second plate slot insertion piece 45 can interfere with the second protrusion 28 at a certain position to constrain further displacement. This prevents the secondary battery cell 10 from detaching from the frame 20B.

[0128] Furthermore, the second plate slot insertion piece 45 can also be provided on the second plate end face wall 44B of the second plate portion 40B. It can be configured such that by also providing the second frame protrusion 28 on the frame back side 24B, and similarly providing the displacement constraint unit on the end face side in the long side direction of the second plate portion 40B, the second plate portion 40B will not detach from the frame 20B. Alternatively, it can be configured as follows... Figure 24 As shown in the cross-sectional perspective view, the structure is designed so that the second protrusion of the frame is not provided on the back side 24B of the frame. Alternatively, it can be as described later. Figure 32 In that way, the thickness of the second protrusion 28C of the frame is reduced.

[0129] [Implementation Method 3]

[0130] The above example illustrates an example where the second protrusion 28 is formed integrally along the long side of the frame 20. However, this disclosure is not limited to this structure; the second protrusion can also be formed partially along the long side of the frame. Taking such an example as the battery pack 300 according to Embodiment 3, in... Figures 25-33 As shown. In these figures, respectively, Figure 25 A perspective view is shown representing the battery pack 300 according to Embodiment 3. Figure 26 Show Figure 25 Exploded 3D view of battery pack 300. Figure 27 Shown from the rear view Figure 25 A magnified 3D view of the battery pack 300. Figure 28 Show Figure 27 Exploded 3D view of battery pack 300. Figure 29 Showing the view from below at an angle Figure 26 A 3D view of the second plate 40C sliding into the frame 20C. Figure 30 Showing indicates from Figure 29A perspective view showing the state in which the second plate slot insertion piece 45C is positioned in the guide recess 29n. Figure 31 Show Figure 25 A three-dimensional cross-sectional view of the battery pack at line XXXI-XXXI of 300. Figure 32 Show Figure 25 A three-dimensional cross-sectional view of the battery pack 300 at line XXXII-XXXII. Figure 33 Show Figure 25 A perspective cross-sectional view of the battery pack 300 along line XXXIII-XXXIII. In these drawings, the same reference numerals are used for components identical to those in Embodiment 1 described above, and detailed descriptions are appropriately omitted. For example... Figure 25 As shown, the battery pack 300 according to Embodiment 3 also has a plate-like shape. Furthermore, as... Figure 26 As shown, the battery pack 300 includes a first plate portion 30C, a second plate portion 40C, and a frame 20C.

[0131] Figure 26 , Figure 28 The frame 20C shown partially forms a second protrusion 28C along its long side. Alternatively, as... Figure 27 , Figure 28 As shown, the second protrusions 28C of the frame are intermittently arranged in their extending direction, and the plurality of second protrusions 28C are formed in an island shape. Furthermore, the positions of the second protrusions 28C are set such that, when the second plate portion 40C is connected to the frame body 20C, they correspond to the positions of the second plate slot insertion pieces 45C on the side wall 42C of the second plate. Thus, when the second plate portion 40C is connected to the frame body 20C, each of the second plate slot insertion pieces 45C abuts against the second protrusions 28C, appropriately functioning as a displacement constraint unit.

[0132] (Second connected space 28n)

[0133] On the other hand, as a result of the intermittent arrangement of the second protrusions 28C of the frame, between adjacent second protrusions 28C, such as Figure 28As shown, a second communicating space 28n is formed without a frame second protrusion 28C. In other words, at the upper end of the frame 20C, the flat surface of the frame wall portion 22C is exposed, forming a state where a second communicating space 28n connected to the second sliding groove 27C is formed. Furthermore, the width of the second communicating space 28n is the same as or slightly larger than the width of the second plate slot insertion piece 45C formed on the second plate end face wall 44C of the second plate portion 40C. Moreover, the position of the second communicating space 28n is set to a position corresponding to the second plate slot insertion piece 45C, which is offset from the length of the frame second protrusion 28C from the state where the second plate portion 40C is connected to the frame 20C. That is, the number of second communicating spaces 28n is the same as or more than the number of second plate slot insertion pieces 45C.

[0134] (Guide recess 29n)

[0135] Furthermore, with the second plate portion 40C connected to the frame body 20C, a guide recess 29n is formed below the position where the second protrusion 28C of the frame is located. The width of the guide recess 29n is set to be the same as or slightly larger than the width of the second protrusion 28C of the frame.

[0136] By adopting this structure, the operation of connecting the second plate portion 40C to the frame 20C can be simplified. Specifically, during the process of connecting the second plate portion 40C by inserting the second plate slot insertion piece 45C into the second sliding groove 27C to allow the second plate portion 40C to slide along the long side of the frame 20C, in... Figure 7 In the battery pack 100 of Embodiment 1 shown, it is necessary to slide the second plate portion 40C along the entire area of ​​its long side. In contrast, in the battery pack 300 of Embodiment 3, inserting the second plate from above the frame 20C and moving it by the length of the second protrusion 28C in the horizontal direction is sufficient. That is, as shown... Figure 29 As shown, if the second plate slot insert 45C is inserted into the second communicating space 28n, it passes through the second communicating space 28n, abuts against the frame guide 29C, and stops. In this state, the second plate slot insert 45C is located in the second sliding groove 27C. From here, as... Figure 29 Slide the second plate 40C in as shown by the middle arrow, thus, as Figure 30 As shown, the second plate slot insert 45C falls into the guide recess 29n formed in the frame guide portion 29C. That is, the second plate portion 40C sinks into the guide recess 29n by a certain depth. In this state, as Figure 31As shown, the stroke amount DS between the second protrusion 28C and the guide recess 29n can be set, and the second plate slot insertion piece 45C can be displaced in the vertical direction. Thus, for the installation operation of the second plate portion 40C onto the frame 20C, even without moving the entire length along the long side of the frame 20C, it can be inserted from the middle and locked in place, allowing for easy installation. Furthermore, the stroke amount DS that causes the second plate portion 40C to displace can be constrained by the depth of the guide recess 29n.

[0137] Furthermore, a displacement constraint unit can be provided on the end face wall 44C of the second plate portion 40C, which is the same as in Embodiment 1 described above. In the battery pack 300 according to Embodiment 3, as... Figure 32 As shown, the end face wall 44C of the second plate is bent into a "ko" shape in cross-section and inserted into the upper groove 19 formed on the back side 24 of the frame. Here, a gap is provided between the second protrusion 28C of the frame forming the upper groove 19 and the "ko" shaped end face wall 44C of the second plate, so that it matches the stroke amount DS.

[0138] (Second plate insertion end 43)

[0139] Furthermore, a second plate insertion end 43 can also be provided on the surface of the second plate opposite to the end face wall 44C of the second plate. Figure 33 In the example shown, the second plate insertion end 43 is formed into several curved surfaces in the same way as the first plate insertion end 33 to avoid exposed edges. In addition, it serves a covering function so that the interior of the battery pack 300 is difficult to see when the secondary battery cell 10 expands.

[0140] In the example above, a structure was described that connects the second plate portion 40C to the frame 20C, allowing the second plate portion 40C to be inserted into the frame 20C from the middle. This structure is applicable not only to the second plate portion 40C but also to the first plate portion 30C. That is, as... Figure 26 , Figure 28 , Figure 31As shown, the first plate slot insertion piece 35C, formed on the side wall 32C of the first plate, is not formed on the entire surface of the first plate portion 30C along its long side, but rather on a portion of it. Furthermore, correspondingly, the first frame protrusion 26, protruding from the lower end of the outer surface of the frame wall portion 22C, is not formed integrally along the long side of the frame body 20C, but rather at a position corresponding to the first plate slot insertion piece 35C. As a result, a first communicating space is formed between adjacent first frame protrusions 26 that are formed in an island shape. This first communicating space communicates with the first sliding groove 25. By making the width of this first communicating space the same as or wider than the width of the first plate slot insertion piece 35C, the first plate slot insertion piece 35C can be guided through the first communicating space to the first sliding groove 25. Consequently, by inserting the first plate portion 30C from the lower surface side of the frame body 20C and moving it horizontally, the first plate portion 30C can be connected to the frame body 20C. That is, if the first plate slot insert 35C is inserted into the first communicating space, it can pass through the first communicating space and be guided to the first sliding groove 25. Therefore, by moving the length of the first protrusion 26 of the frame in the horizontal direction, the first plate slot insert 35C is held by the first sliding groove 25, and the first plate portion 30C can be connected to the frame 20C.

[0141] [Implementation Method 4]

[0142] In the above example, as a first connecting structure, a structure is described in which the end edge of the first plate portion 30 is machined to form the first plate groove insertion piece 35. However, this disclosure does not limit the first connecting structure to this structure, and other structures can also be used. In particular Figure 5 , Figure 8 In the first plate slot insertion piece 35 shown, in the structure where the end edge of the first plate portion 30 of the metal plate is bent at approximately a right angle, it is difficult to define the length of the end edge of the bent tip, resulting in difficulty in maintaining dimensional accuracy. Therefore, by separating the approximately right-angled bend position from the end edge of the metal plate, it is easier to process and is believed to improve accuracy. As one example, based on... Figures 34-39 To illustrate the battery pack 400 according to embodiment 4. In these figures, respectively, Figure 34 A perspective view is shown illustrating the battery pack 400 according to embodiment 4. Figure 35 Showing a view from below. Figure 34 A 3D view of the 400 battery pack. Figure 36 Show Figure 34 Exploded 3D view of battery pack 400. Figure 37 Shown from the rear view Figure 34 A magnified 3D view of the 400 battery pack. Figure 38 Show Figure 37 Exploded 3D view of battery pack 400. Figure 39 Show Figure 34 A perspective cross-sectional view of the battery pack 400 at line XXXIX-XXXIX. In these drawings, the same reference numerals are used for components identical to those in Embodiment 1 described above, and detailed descriptions are appropriately omitted. Figure 34 , Figure 35 As shown, the battery pack 400 according to Embodiment 4 also has a plate-like shape. Furthermore, as... Figure 36 As shown, the battery pack 400 includes a first plate portion 30D, a second plate portion 40, and a frame 20.

[0143] (35D rewind film)

[0144] like Figures 37-39 As shown, the first plate portion 30D folds back the front end of the first plate sidewall 32D to form a folded-back piece 35D. The folded-back piece 35D folds back the end edge of the first plate sidewall 32 in a U-shape with a given length, and the two pieces overlap. With this processing, since the length of the tip of the bent end edge can be ensured to a certain extent, it is easier to perform and easier to ensure accuracy.

[0145] In addition, it can also be like Figure 38 As shown, a folded-back tab 35D is also formed at the end edge of the end face wall 34D of the first plate.

[0146] [Implementation Method 5]

[0147] In the above examples, a sliding mechanism using a first sliding groove 25 and a second sliding groove 27 was described in the first and second connecting structures that connect the first plate portion 30, the second plate portion 40, and the frame 20. However, this disclosure does not limit the first and second connecting structures to structures that use grooves for sliding; other connecting structures can also be used. Taking such an example as the battery pack 500 according to Embodiment 5, in... Figures 40-49 As shown in the figures. In these figures, respectively, Figure 40 A perspective view is shown representing the battery pack 500 according to embodiment 5. Figure 41 Show Figure 40 Exploded 3D view of battery pack 500. Figure 42 Show Figure 41 Further exploded perspective view of the 500 battery pack. Figure 43 Shown from the rear view Figure 41 A magnified 3D view of the 500 battery pack. Figure 44 Show Figure 43 Exploded 3D view of battery pack 500. Figure 45 Show Figure 41 A three-dimensional cross-sectional view of the 500-cell battery pack at the XLV-XLV line. Figure 46 Show Figure 41 A three-dimensional cross-sectional view of the XLVI-XLVI line of the 500 battery pack. Figure 47 Show Figure 41 A three-dimensional cross-sectional view of the XLVII-XLVII line of the 500 battery pack. Figure 48 Show Figure 41 A three-dimensional cross-sectional view of the 500 battery pack at the XLVIII-XLVIII line. Figure 49 Showing the representation Figure 42 A perspective view of the frame 20E of the battery pack 500. In these drawings, the same reference numerals are used for components identical to those in Embodiment 1 described above, and detailed descriptions are appropriately omitted. Figure 40 As shown, the battery pack 500 according to Embodiment 5 also has a plate-like shape. Furthermore, as... Figure 41 As shown, the battery pack 500 includes a first plate portion 30E, a second plate portion 40E, and a frame 20E.

[0148] (First board stop hole 38)

[0149] The first plate portion 30E has a first plate sidewall 32E on its side along its long side. The first plate sidewall 32E forms a plurality of first plate locking holes 38 separately. Figures 41-44 In the example shown, the first plate sidewall 32 is partially formed larger near the formation of the first plate retaining hole 38. Alternatively, it can be as follows... Figure 42 As shown, the first plate sidewall 32 is partially formed to be larger around a plurality of adjacent first plate locking holes 38. Each of the first plate locking holes 38 opens in a continuous rectangular shape from the first plate main surface 31E of the first plate portion 30 to the first plate sidewall 32.

[0150] (First frame stop piece 71)

[0151] Furthermore, a plurality of first frame locking tabs 71 are separately formed at the lower ends of the outer surfaces of the pair of frame wall portions 22E on the frame body 20E. The first frame locking tabs 71 are respectively positioned corresponding to the locking holes 38 of the first plate. When viewed in a cross-section intersecting the long side direction, each of the first frame locking tabs 71 appears as follows: Figure 45As shown, the structure is formed as a right-angled triangle with its hypotenuse tapering upwards towards the bottom. In cross-section, the first frame locking piece 71 of the right-angled triangle has its upper surface, extending from the first inclined surface 72 forming the hypotenuse, designated as a first flat surface 73. The inner surface of the first plate locking hole 38 abuts against this first flat surface 73, locking the first plate sidewall 32E against the frame wall portion 22E. The frame body 20E, with this configuration, is pressed into the first plate sidewalls 32E from above. The first frame locking piece 71's first inclined surface 72 causes the first plate sidewalls 32E to expand apart, or a reaction force causes them to narrow apart, thus locking the first frame locking piece 71 against the first plate locking hole 38. In this state, the height (i.e., the longitudinal length) of the first plate locking hole 38 and the height (i.e., the longitudinal length) of the first frame locking piece 71 are aligned, preventing vertical displacement with the frame body 20E.

[0152] (Second board stop hole 48)

[0153] Similarly, the second plate portion 40E has a second plate sidewall 42E on its long side. The second plate sidewall 42E also has a plurality of second plate locking holes 48 formed separately. Figures 41-44 In the example shown, the second plate sidewall 42E is partially formed to be larger near the formation of the second plate locking hole 48. Each of the second plate locking holes 48 opens continuously in a rectangular shape from the main surface of the second plate portion 40E to the second plate sidewall 42E.

[0154] (Second frame stop piece 81)

[0155] Furthermore, a plurality of second frame locking tabs 81 are separately formed on the upper end of the outer surface of the pair of frame wall portions 22E of the frame body 20E. The second frame locking tabs 81 are respectively disposed at positions corresponding to the second plate locking holes 48. When viewed in a cross-section intersecting the long side direction, each of the second frame locking tabs 81 appears as follows: Figure 46 As shown, it is formed into an upward-facing right-angled triangle shape with the hypotenuse tapering towards the top. In cross-section, the second frame locking piece 81 of the right-angled triangle shape has its lower surface, extending from the second inclined surface 82 forming the hypotenuse, set as a second flat surface 83. The inner surface of the second plate locking hole 48 abuts against this second flat surface 83 to lock the second plate sidewall 42E into the frame wall portion 22E. The frame body 20E of this structure is pressed into the second plate sidewalls 42E from below. The second inclined surface 82 of the second frame locking piece 81 causes the second plate sidewalls 42E to expand apart, or a reaction force causes the pair of frame wall portions 22E to narrow apart, thereby locking the second frame locking piece 81 into the second plate locking hole 48. Furthermore, as... Figure 46As shown, the height (i.e., the longitudinal length) of the second plate locking hole 48 is longer than the height (i.e., the longitudinal length) of the second frame locking piece 81, so that the second plate portion 40E can be displaced in the upward direction when the second plate portion 40E is connected to the frame 20E. Therefore, the difference between the height of the second plate locking hole 48 and the height of the second frame locking piece 81 allows the second plate portion 40E to be displaced in the vertical direction by a stroke amount DS.

[0156] Furthermore, this first connecting structure and second connecting structure, based on the first frame locking piece 71 and the first plate locking hole 38, the second frame locking piece 81 and the second plate locking hole 48, can be attached not only to the side of the battery pack 500 along its long side, but also to the end face. Figure 41 , Figure 42 , Figure 47 In the example, the first plate end wall 34E of the first plate portion 30E and the second plate end wall 44E of the second plate portion 40E are also provided with the first plate locking hole 38 and the second plate locking hole 48.

[0157] In addition, such as Figure 48 As shown in the cross-sectional view, the first plate portion 30E bends the first plate insertion end 33E in the same way.

[0158] In addition, such as Figure 43 , Figure 44 As shown, on the outer surface of the frame wall portion 22E, the first frame locking piece 71 and the second plate locking hole 48 are not arranged at the same position in the vertical direction, but are offset. By setting it in this way, as Figure 45 , Figure 46 As shown, when the first frame locking piece 71 is locked in the first plate locking hole 38 and the second frame locking piece 81 is locked in the second plate locking hole 48, even if the portions of the first plate sidewall 32E and the second plate sidewall 42E that form the first plate locking hole 38 and the second plate locking hole 48 respectively become larger, they are prevented from interfering with each other, thereby preventing the situation where the frame wall portion 22 becomes thicker outward.

[0159] (Panel protrusion 90)

[0160] Furthermore, a wall protrusion 90 is formed in the area where the enlarged portions around the first plate locking holes 38 and second plate locking holes 48 of the first plate sidewalls 32E and second plate sidewalls 42E are absent. The thickness of the wall protrusion 90 is set to be the same planar thickness as the side surface where the first plate portion 30E and the second plate portion 40E are connected to the frame body 20E, that is, a thickness approximately the same as or slightly thicker than the thickness of the first plate sidewalls 32E and the second plate sidewalls 42E. By forming the wall protrusion 90, the frame body 20E can be partially thickened for reinforcement. In addition, as Figure 49As shown in the perspective view, by setting the position where the wall protrusion 90 is formed in the frame 20E to be separate from the first frame locking piece 71 and the second frame locking piece 81, it is also possible to obtain the advantage of additional strength to resist the deformation of the frame 20E.

[0161] In the examples above, the battery pack was described as a power source for portable electronic devices such as game consoles. However, this disclosure is not limited to this; the battery pack can also be equipped with electrical equipment for other purposes, such as powering electrical equipment. Examples of electrical equipment include portable electrical devices, electric vehicles, electric carts, and other mobile devices. In such electrical equipment, when the remaining capacity of the battery pack decreases or the battery pack deteriorates over time, the battery pack can be replaced, allowing continued use of the electrical equipment. However, this disclosure does not primarily limit the battery pack to replaceable battery packs that house individual secondary battery cells; it can also be applied to methods where secondary battery cells are housed within the casing of the electrical equipment. In this disclosure, a battery pack is simply one that houses individual secondary battery cells within a casing; the option of housing secondary battery cells for driving within the casing of the electrical equipment itself is also included in the battery pack concept. That is, this disclosure is not limited to replaceable battery packs; it can also be applied to electrical equipment with built-in secondary battery cells.

[0162] Industrial availability

[0163] The battery pack and its manufacturing method disclosed herein can be used not only as a power source for driving portable electronic terminals such as game consoles, but also as a power source for wireless devices, portable electrical devices such as electric vacuum cleaners and power tools. Furthermore, it can be used as a power source for driving mobile devices such as electric bicycles, electric trolleys, and electric scooters, or as a backup power source for servers, or as a stationary energy storage device for home, office, or factory use.

[0164] Explanation of reference numerals in the attached figures

[0165] 100, 100', 200, 300, 400, 500... battery packs

[0166] 1…Single-unit aggregate

[0167] 10…Secondary battery cell

[0168] 11…Single First Main Face

[0169] 12…Single Second Main Face

[0170] 13…Single side

[0171] 15…External Electrode

[0172] 19… Frame upper groove

[0173] Frames 20, 20B, 20C, 20E…

[0174] 21…space

[0175] 22, 22B, 22C, 22E… Frame wall section

[0176] 23… Front view of the frame

[0177] 24, 24B…back side of frame

[0178] 25…First sliding groove

[0179] 26… First protrusion of frame

[0180] 27, 27C… Second sliding groove

[0181] 28, 28C… second protrusion of frame

[0182] 28n…Second Connected Space

[0183] 29, 29C… Frame Guide Section

[0184] 29n…Guide recess

[0185] 30, 30C, 30D, 30E… First Plate Section

[0186] 31E…First board main surface

[0187] 32, 32C, 32D, 32E… First plate sidewall

[0188] 33, 33E… First board insertion end

[0189] 34, 34D, 34E… First plate end face wall

[0190] 35, 35C… First slot insert piece

[0191] 35D…foldback film

[0192] 38…First board stop hole

[0193] 40, 40B, 40C, 40E… Second section

[0194] 41…Second board, first side

[0195] 42, 42B, 42C, 42E… Second plate sidewall

[0196] 43…Second plate insertion end

[0197] 44, 44B, 44C, 44E… Second plate end face wall

[0198] 45, 45C… Second plate slot insert piece

[0199] 48…Second plate stop hole

[0200] 50…First adhesive

[0201] 60…Second adhesive

[0202] 65… Tags

[0203] 71…First frame stop plate

[0204] 72…First Inclined Surface

[0205] 73…First flat surface

[0206] 81…Second frame stop plate

[0207] 82…Second Inclined Surface

[0208] 83…Second flat surface

[0209] 90…wall protrusion

[0210] DS…travel volume.

Claims

1. A battery pack, comprising: A secondary battery cell has a first main surface of the cell, a second main surface of the cell that is opposite to the first main surface of the cell, and a pair of side surfaces of the cell connecting the first main surface of the cell and the second main surface of the cell. A resin frame having a pair of frame wall portions covering at least one pair of cell sides of the secondary battery cells; A first metal plate, connected to the frame by a first connecting structure, and fixed to the first main surface of the secondary battery cell via a first adhesive; and The second metal plate is connected to the frame via a second connecting structure and is fixed to the second main surface of the secondary battery cell via a fixing unit. The second connecting structure is configured such that, in the state of the expanded secondary battery cell, the second plate portion is allowed to displace away from the first plate portion between the pair of frame wall portions.

2. The battery pack according to claim 1, wherein, The fixing unit is an adhesive label that is wound around the periphery of the individual cell assembly, wherein the individual cell assembly covers the first main surface of the secondary battery cell with the first plate portion, covers the second main surface of the cell with the second plate portion, and covers the side surfaces of the pair of cells with the frame.

3. The battery pack according to claim 1, wherein, The fixing unit is a second adhesive body that is pasted between the second main surface of the secondary battery cell and the first surface of the second plate on the side of the second plate that faces the second main surface of the cell.

4. The battery pack according to claim 1, wherein, The second connecting structure is configured such that, when the secondary battery cell contracts from an expanded state, the second plate portion is allowed to move between the pair of frame wall portions toward the first plate portion.

5. The battery pack according to claim 1, wherein, The second connecting structure includes a displacement constraint unit, which constrains the displacement of the second plate portion in a direction away from the first plate portion.

6. The battery pack according to claim 5, wherein, The second plate portion has a second plate sidewall on its side along its long side. The pair of frame wall portions of the frame body have frame guide portions on the outer surfaces of the pair of frame wall portions that guide the lower surface of the side wall of the second plate. The displacement constraint unit comprises a plate groove insertion piece at least partially provided on the side wall of the second plate in the long side direction of the second plate side wall, and a second frame protrusion that is separated upward from the frame guide portion and at least partially provided on the long side direction of the second plate side wall. The structure is configured such that if the plate slot insert is displaced upward, the second protrusion of the frame will interfere.

7. The battery pack according to claim 6, wherein, When the second plate is connected to the frame, the frame guide portion has a guide recess with the same width as or larger than the second protrusion of the frame below the position where the second protrusion of the frame is located.

8. The battery pack according to any one of claims 1 to 7, wherein, The first plate portion has at least a partial first plate sidewall on its side surface in the long side direction, and at least one end face in the long side direction is made flat. The first connecting structure is implemented by a sliding mechanism that allows the first plate sidewall of the first plate portion to slide on the surfaces of the pair of frame wall portions of the frame.

9. The battery pack according to claim 8, wherein, The sliding mechanism consists of a first sliding groove arranged along the long side direction on the outer surface of the pair of frame walls of the frame, and a folding piece that can be inserted into the first sliding groove to fold back the end edge of the first plate side wall of the first plate.

10. The battery pack according to any one of claims 1 to 7, wherein, The second connecting structure includes wall protrusions of the second plate sidewalls disposed on the pair of frame wall portions of the frame.

11. The battery pack according to any one of claims 1 to 7, wherein, The end edge of the first plate is set to a curved surface.

12. The battery pack according to any one of claims 1 to 7, wherein, The end edge of the second plate is made into a curved surface.

13. A method for manufacturing a battery pack, the battery pack comprising: A secondary battery cell has a first main surface of the cell, a second main surface of the cell that is opposite to the first main surface of the cell, and a pair of side surfaces of the cell connecting the first main surface of the cell and the second main surface of the cell. A resin frame having a pair of frame wall portions covering at least one pair of cell sides of the secondary battery cells; A first metal plate, fixed to the frame, covers the first main surface of the secondary battery cell; and A second metal plate covers the second main surface of the secondary battery cell. The method for manufacturing the battery pack includes the following steps: The first plate portion is slidable between the pair of frame wall portions of the frame body to connect the frame body and the first plate portion; The secondary battery cell is inserted between the pair of frame walls of the frame, and the first main surface of the secondary battery cell is fixed to the first plate via a first adhesive; and The second plate portion is fixed to the second main surface of the secondary battery cell via a fixing unit.

14. The method for manufacturing a battery pack according to claim 13, wherein, The first plate insertion end, which is flat on one of the long side faces of the first plate sidewalls formed by bending the long side of the first plate portion, approaches the long side face of the frame body, so that the first plate sidewall of the first plate portion slides on the outer surface of the pair of frame wall portions of the frame body, thereby connecting the frame body and the first plate portion.

15. The method for manufacturing a battery pack according to claim 14, wherein, A folding piece is inserted into the first sliding groove formed along the long side direction on the outer surface of the pair of frame wall portions of the frame, and slid to connect the frame and the first plate portion.

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