Restraint device

Abstract

The utility model relates to a kind of constraint device for constraining power storage module, it has: elastic component;Current collector plate, with the elastic component is laminated in laminating direction;Metal foil, cover the elastic component;Pressurizing portion.The pressurizing portion is pressed in the laminating direction to laminated body, the laminated body is in the laminating direction sequentially laminated the power storage module, the elastic component, the current collector plate and is formed.The elastic component includes the first surface and second surface arranged in the laminating direction, the first surface is configured in the laminated body towards the power storage module side.The metal foil includes: first portion, cover the first surface and with the power storage module electric connection;Second portion, with the current collector plate electric connection;Connecting portion, the first portion is connected with the second portion.It is thus possible to easily separate the elastic component from the power storage module and electrically connect the power storage module with the current collector plate.

Description

Technical Field

[0001] This utility model relates to a restraint device. Background Technology

[0002] Japan Special Opening 2019 Publication No. 216073 discloses a constraint part that applies a constraint load to multiple energy storage modules constituting an electrode stack in the stacking direction. The constraint part clamps the multiple energy storage modules in the stacking direction by a pair of constraint plates. Conductive plates are disposed between the energy storage modules. The energy storage modules arranged in the stacking direction are electrically connected to each other through the conductive plates.

[0003] Although Japan Special Opening 2019 While not described in Publication No. 216073, in order to ensure uniform surface pressure on the energy storage module, elastic members are sometimes used instead of conductive plates to apply pressure to the energy storage module in the stacking direction. In this case, an elastic member is disposed between the current collector and the energy storage module. In this structure, because the elastic member is elastic and adhered to the energy storage module, it is difficult to separate the elastic member from the energy storage module. Furthermore, in the above configuration where an elastic member is disposed between the energy storage module and the current collector, it is necessary to prevent the elastic member from obstructing the electrical connection between the energy storage module and the current collector. Utility Model Content

[0004] This utility model was made to solve the above-mentioned technical problems. Its purpose is to provide a battery module that allows for easy separation of the elastic component from the energy storage module and electrical connection between the energy storage module and the current collector.

[0005] The present invention discloses a constraint device for constraining a battery storage module, comprising: an elastic member; a current collector plate stacked with the elastic member in a stacking direction; a metal foil covering the elastic member; and a pressure-applying part. The pressure-applying part applies pressure to the stacked body in the stacking direction, the stacked body being formed by sequentially stacking the battery storage module, the elastic member, and the current collector plate in the stacking direction. The elastic member includes a first surface and a second surface arranged in the stacking direction, the first surface being disposed in the stacked body facing the battery storage module. The metal foil includes: a first portion covering the first surface and electrically connected to the battery storage module; a second portion electrically connected to the current collector plate; and a connecting portion connecting the first portion and the second portion.

[0006] As described above, in the constraint device of this invention, the metal foil includes a first portion covering a first surface and electrically connected to the energy storage module, a second portion electrically connected to the current collector, and a connecting portion connecting the first portion and the second portion. Therefore, since the first portion of the metal foil is provided between the energy storage module and the first surface of the elastic member, the metal foil (first portion) can suppress the elastic member from adhering to the energy storage module (generating adhesion). Furthermore, since the first portion electrically connected to the energy storage module is connected to the second portion electrically connected to the current collector via the connecting portion, the energy storage module and the current collector can be electrically connected. Thus, the elastic member can be easily separated from the energy storage module, and the energy storage module and the current collector can be electrically connected.

[0007] The elastic member may include a connecting surface that connects the first surface and the second surface. The current collector may include a third surface opposite the second surface in the stacking direction. The connecting portion may extend along the connecting surface. The second portion may extend along the third surface. With this configuration, since the second portion extends along the third surface, its area can be easily increased compared to the case where the second portion extends along the side of the current collector (the surface extending along the stacking direction). As a result, the current flowing between the current collector and the energy storage module can be increased. Therefore, the charging efficiency of the energy storage module can be improved. Furthermore, by extending the connecting portion along the connecting surface, the length of the connecting portion can be reduced compared to the case where the distance between the connecting portion and the connecting surface is large.

[0008] The restraint device may include an adhesive material disposed between the current collector and the elastic member, bonding the current collector and the elastic member together. The second surface may have a contact surface that contacts the adhesive material and a non-contact surface that does not contact the adhesive material. A gap corresponding to the thickness of the adhesive material in the lamination direction may be formed between the current collector and the non-contact surface. A second portion may also be disposed in this gap. With this configuration, the current collector and the elastic member can be fixed with the adhesive material, and a space for arranging the second portion can be formed.

[0009] The non-contact surface can be configured in a ring shape along the outer periphery of the second surface. The second portion can also be configured in a ring shape along the ring-shaped non-contact surface. With this configuration, for example, compared to the case where the second portion extends only along one side of the second surface, the area of ​​the second portion can be further increased. As a result, the current flowing between the current collector and the energy storage module can be further increased. Therefore, the charging efficiency of the energy storage module can be further improved.

[0010] The thickness of the metal foil can be between 10 μm and 1 mm. This configuration improves the mechanical strength of the metal foil compared to a thickness of less than 10 μm. Compared to a thickness greater than 1 mm, it maintains the flexibility of the elastic component and effectively absorbs fluctuations in the energy storage module. Consequently, surface pressure deviations caused by the elastic component can be suppressed.

[0011] According to this invention, the elastic component can be easily separated from the energy storage module and the energy storage module can be electrically connected to the current collector. Attached Figure Description

[0012] Figure 1 This is a perspective view showing the configuration of a constraint device and a laminated body according to one embodiment.

[0013] Figure 2 for Figure 1 The exploded diagram.

[0014] Figure 3 This is a cross-sectional view showing the structure of a laminate according to one embodiment.

[0015] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0016] Figure 5 This is a plan view of an elastic member according to one embodiment, viewed from the Z2 side.

[0017] Figure 6 This is a cross-sectional view showing the configuration of the constraint device and the laminate in a modified embodiment. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. In the drawings, the same or equivalent parts are given the same reference numerals and their descriptions are not repeated.

[0019] Reference Figures 1-5 The constraint device 100 according to an embodiment of the present invention will be described. The constraint device 100 is a fixture used to constrain the energy storage module during the manufacturing process of the energy storage device. Furthermore, the energy storage module may be, for example, a secondary battery such as a lithium-ion secondary battery.

[0020] Figure 1 This is a three-dimensional schematic diagram showing the state in which the laminate 1 is constrained by the constraint device 100. In this specification, the Z direction is defined as the lamination direction of the laminate 1. The X and Y directions are orthogonal to the Z direction. The X and Y directions are orthogonal to each other in a plane orthogonal to the Z direction. The Z direction is an example of the "lamination direction" of this invention.

[0021] The constraint device 100 has end plates 10 and 20 and constraint members 30 and 40. The constraint device 100 applies a constraint load to the laminate 1 in the Z direction. By appropriately applying a constraint load to the laminate 1, the inter-electrode distance in the energy storage module is appropriately maintained. As a result, the deposition of metal (e.g., lithium) in the electrodes (negative electrodes) of the energy storage module can be suppressed.

[0022] The laminate 1 is held in the Z direction by end plate 10 and end plate 20. End plate 10 is disposed on the Z1 side relative to the laminate 1. End plate 20 is disposed on the Z2 side relative to the laminate 1. In addition, end plate 10 and end plate 20 are examples of the "pressurizing part" of this utility model.

[0023] Constraint member 30 constrains the X1 side end of the laminate 1 in the Z direction. Constraint member 40 constrains the X2 side end of the laminate 1 in the Z direction.

[0024] Figure 2 This is an exploded perspective view showing the laminate 1 and the constraint device 100. The laminate 1 is formed, for example, in a cuboid shape. The laminate 1 includes at least one energy storage module 2, at least one current collector 3, and at least one elastic member 4. In this embodiment, the laminate 1 includes multiple energy storage modules 2, multiple current collectors 3, and multiple elastic members 4. Furthermore, the elastic member 4 is formed, for example, of polyurethane. The elastic member 4 is insulating.

[0025] The energy storage module 2 includes multiple cell units (not shown) and a frame. The cell units are, for example, bipolar batteries. Multiple cell units adjacent to each other in the Z-direction are electrically connected. Each cell unit has a first current collector, a negative electrode, a separator, a positive electrode, and a second current collector. The multiple cell units are stacked in the Z-direction with the second current collector and the first current collector adjacent to each other. The frame is formed in a ring shape and extends in the stacking direction. The frame is formed to surround the stacked multiple cell units.

[0026] The current collector 3 sandwiches the energy storage module 2 in the middle and is stacked in the Z direction. The current collector 3 is electrically connected to a power source (not shown) and is powered by the power source. For example, the current collector 3 closest to the Z1 side of the plurality of current collectors 3 can be electrically connected to one of the positive and negative terminals of the power source, and the current collector 3 closest to the Z2 side of the plurality of current collectors 3 can be electrically connected to the other of the positive and negative terminals of the power source. This allows each energy storage module 2 of the stacked body 1 to be charged. However, the charging method for the energy storage module 2 is not limited to the above example. Furthermore, in... Figure 2 For simplicity, the diagram shows that the energy storage module 2, the current collector 3, and the elastic component 4 have the same size.

[0027] The constraint device 100 includes elastic sheets 50 and 60. Elastic sheet 50 is disposed between end plate 10 and laminate 1. Elastic sheet 50 is held between end plate 10 and laminate 1 in the Z direction. Elastic sheet 60 is disposed between end plate 20 and laminate 1. Elastic sheet 60 is held between end plate 20 and laminate 1 in the Z direction. Through elastic sheets 50 and 60, a uniform constraint load can be applied to laminate 1. Furthermore, elastic sheets 50 and 60 are insulating.

[0028] End plates 10 and 20 press the laminate 1 (laminates 1a and 1b described later) in the Z direction. Specifically, end plate 10 presses the laminate 1 on the Z2 side, and end plate 20 presses the laminate 1 on the Z1 side. End plates 10 and 20 are plate-shaped components. When viewed from above at a position away from end plate 10 on the Z1 side, end plate 10 has a rectangular shape covering the laminate 1. When viewed from above at a position away from end plate 20 on the Z2 side, end plate 20 has a rectangular shape covering the laminate 1.

[0029] The end plate 10 includes a first plate 11, a second plate 12, and a plurality of ribs 13. The first plate 11 and the second plate 12 are arranged in the Z direction. The first plate 11 and the second plate 12 are opposite to each other in the Z direction. In addition, the first plate 11 has the same shape and size as the second plate 12.

[0030] Multiple ribs 13 are respectively disposed between the first plate 11 and the second plate 12. The first plate 11 and the second plate 12 are connected by the multiple ribs 13. The multiple ribs 13 extend in the X direction. The multiple ribs 13 are arranged at intervals in the Y direction.

[0031] A plurality of notches 11a and a plurality of notches 11b are formed on the first plate 11. The plurality of notches 11a are arranged side by side along the X1 side of the first plate 11. The plurality of notches 11b are arranged side by side along the X2 side of the first plate 11.

[0032] Multiple notches 12b are formed on the second plate 12 below the notch 11b of the first plate 11. That is, the multiple notches 12b overlap with the multiple notches 11b in the Z direction.

[0033] In addition, although Figure 2 Not shown in the figure, but multiple notches are formed on the second plate 12 below the notch 11a of the first plate 11. These multiple notches overlap with the multiple notches 11a in the Z direction.

[0034] End plate 20 has the same configuration as end plate 10. That is, end plate 20 includes a first plate 21, a second plate 22, and a plurality of ribs 23. A plurality of notches 21a and a plurality of notches 21b are formed on the first plate 21. A plurality of notches 22b and a plurality of notches (not shown) that overlap with notches 21a in the Z direction are formed on the second plate 22.

[0035] Constraint members 30 and 40 are arranged at intervals, sandwiching the laminate 1 in the X direction. The laminate 1 is held by the constraint members 30 and 40 and is pressurized in the Z direction. Constraint member 30 is disposed on the X1 side of the laminate 1. Constraint member 40 is disposed on the X2 side of the laminate 1. Constraint member 30 has the same shape as constraint member 40. Therefore, only the configuration of constraint member 40 will be described in detail below.

[0036] The constraint member 40 includes a frame 41 and a plurality of column members 42. The frame 41 has an upper frame 41a and a lower frame 41b. The upper frame 41a and the lower frame 41b are arranged at intervals in the Z direction. The upper frame 41a and the lower frame 41b extend in the Y direction, respectively.

[0037] Multiple column members 42 are arranged at intervals in the Y direction between the upper frame 41a and the lower frame 41b. The multiple column members 42 extend in the Z direction and connect the upper frame 41a and the lower frame 41b.

[0038] With the stacked body 1 constrained by the constraint member 40, multiple column members 42 pass through overlapping notches 11b, 12b, 21b, and 22b in the Z direction. In this state, the lower surface of the upper frame 41a contacts the upper surface 11c of the first plate 11. The upper surface of the lower frame 41b contacts the lower surface 22c of the second plate 22. Thus, the stacked body 1, end plate 10, and end plate 20 are clamped by the upper frame 41a and the lower frame 41b.

[0039] The constraint member 30 includes a frame 31 and a plurality of column members 32. The frame 31 has an upper frame 31a and a lower frame 31b.

[0040] With the stacked body 1 constrained by the constraint member 30, multiple column members 32 pass through notches 11a and 21a arranged in the Z direction and notches (not shown) formed on the second plate 12 and the second plate 22, respectively. In this state, the lower surface of the upper frame 31a contacts the upper surface 11c of the first plate 11. The upper surface of the lower frame 31b contacts the lower surface 22c of the second plate 22. Thus, the stacked body 1, end plate 10, and end plate 20 are clamped by the upper frame 31a and the lower frame 31b.

[0041] The restraint device 100 has a protective component 70, a protective component 71, a protective component 72 and a protective component 73.

[0042] Protective member 70 and protective member 71 are respectively disposed between constraining member 30 and constraining member 40, and are fixed to the upper surface 11c of the first plate 11. Protective member 70 extends along the upper frame 31a in the Y direction. Protective member 71 extends along the upper frame 41a in the Y direction.

[0043] Protective member 72 and protective member 73 are respectively disposed between constraining member 30 and constraining member 40, and are fixed to the lower surface 22c of the second plate 22. Protective member 72 extends along the lower frame 31b in the Y direction. Protective member 73 extends along the lower frame 41b in the Y direction.

[0044] Figure 3 This is a cross-sectional view of the laminate 1. Multiple energy storage modules 2 are arranged in the Z direction. The energy storage modules 2 arranged in the Z direction are held together by two elastic members 4 in the Z direction by the current collector 3.

[0045] An elastic component 4 and a current collector 3 are stacked between the elastic sheet 50 and the energy storage module 2. The elastic component 4 is adjacent to the energy storage module 2 and the current collector 3 is adjacent to the elastic sheet 50.

[0046] An elastic component 4 and a current collector 3 are stacked between the elastic sheet 60 and the energy storage module 2. The elastic component 4 is adjacent to the energy storage module 2 and the current collector 3 is adjacent to the elastic sheet 60.

[0047] Figure 4 for Figure 3 A magnified view of a portion of the image. Figure 4 The diagram illustrates energy storage modules 2 arranged in the Z direction, elastic components 4 disposed between the energy storage modules 2, and a current collector 3. Figure 4 The diagram shows a stacked assembly 1a arranged in the order of energy storage module 2, elastic component 4, and current collector 3, starting from the Z1 side. Additionally, in... Figure 4 The diagram shows a stacked assembly 1b arranged from the Z2 side in the order of energy storage module 2, elastic component 4, and current collector 3. The current collector 3 of the stacked assembly 1a is the same as that of the stacked assembly 1b. Since the stacked assembly 1b is simply a reversed version of the stacked assembly 1a in the Z direction, it has the same structure as the stacked assembly 1a. Therefore, the following description will mainly focus on the structure of the stacked assembly 1a.

[0048] The restraint device 100 has a metal foil 80 and adhesive materials 91 and 92. The metal foil 80 covers the elastic member 4. The metal foil 80 is, for example, aluminum foil. Alternatively, the metal foil 80 may also be formed of a metal other than aluminum (e.g., copper).

[0049] The elastic member 4 includes surfaces 4a and 4b arranged in the Z direction. Surface 4a is disposed facing the energy storage module 2 (Z1 side in the laminate 1a). Surface 4b is disposed facing the current collector 3 (Z2 side in the laminate 1a). In addition, surfaces 4a and 4b are examples of the "first surface" and "second surface" of this utility model, respectively.

[0050] The elastic member 4 includes a connecting surface 4c that connects the connecting surfaces 4a and 4b. The connecting surface 4c extends from the outer periphery of the surface 4a toward the surface 4b. The connecting surface 4c is circumferential.

[0051] The current collector 3 includes a surface 3a. Surface 3a is a surface disposed facing the Z1 side. Surface 3a is opposite to surface 4b of the elastic member 4 in the Z direction. Surface 3a corresponds to the "third surface" of this invention in the laminate 1a. In addition, surface 3b disposed on the opposite side of surface 3a in the current collector 3 corresponds to the "third surface" of this invention in the laminate 1b.

[0052] In existing constraint devices, the elastic member is attached to the energy storage module, making it difficult to detach from the module. Furthermore, in the aforementioned configuration where the elastic member is positioned between the energy storage module and the current collector, it is necessary to prevent the electrical connection between the energy storage module and the current collector from being obstructed by the elastic member.

[0053] Therefore, in this embodiment, the metal foil 80 includes a portion 81, a portion 82, and a connecting portion 83. The portion 81 covers the surface 4a of the elastic member 4. The portion 81 is electrically connected to the energy storage module 2. The portion 82 is electrically connected to the current collector 3. The connecting portion 83 connects the portion 81 and the portion 82. Furthermore, the portions 81 and 82 are examples of the "first portion" and "second portion" of this utility model, respectively.

[0054] Therefore, since a portion 81 with a metal foil 80 is provided between the energy storage module 2 and the elastic member 4, it is possible to prevent the elastic member 4 from sticking to the energy storage module 2. In addition, since the portion 82 electrically connected to the current collector 3 and the portion 81 electrically connected to the energy storage module 2 are connected by a connecting portion 83, the energy storage module 2 and the current collector 3 can be electrically connected.

[0055] Specifically, the connecting portion 83 extends along the connecting surface 4c of the elastic member 4. That is, the connecting portion 83 extends in the Z direction. The portion 82 extends along the surface 3a of the current collector 3. The portion 82 extends from the end of the connecting portion 83 opposite to the portion 81 (the end on the Z2 side in the laminate 1a) in the Y direction ( Figure 4 (The middle part extends from the Y1 side). Part 82 can be bonded to surface 3a by means of a conductive adhesive material (not shown). Furthermore, the method of fixing part 82 to surface 3a is not limited to the examples described above.

[0056] The metal foil 80 is bent at, for example, a right angle at the connection point 84 between portion 81 and connecting portion 83, and at the connection point 85 between connecting portion 83 and portion 82. Thus, the metal foil 80 is formed with portion 82 folded back. Furthermore, although in Figure 4 The diagram shows the state where the end of the adhesive material 92 side of part 82 is separated from the adhesive material 92, but it is also possible for the aforementioned end to be in contact with the adhesive material 92.

[0057] The adhesive 91 bonds a portion 81 of the metal foil 80 to the surface 4a of the elastic member 4. The adhesive 91 can be applied to the entire surface 4a. The portion 81 can also cover the entire surface 4a from the Z1 side.

[0058] Adhesive material 92 bonds surface 4b of the elastic member 4 to surface 3a of the current collector 3. Adhesive material 92 is applied to a portion of both surface 4b and surface 3a. Details will be described later.

[0059] The surface 4b of the elastic member 4 has a contact surface 4d and a non-contact surface 4e. The contact surface 4d is the portion of the surface 4b that is in contact with the adhesive material 92. The non-contact surface 4e is the portion of the surface 4b that is not in contact with the adhesive material 92.

[0060] A gap C is formed between the current collector 3 and the non-contact surface 4e, corresponding to the thickness t1 of the adhesive material 92 in the Z direction. That is, the current collector 3 and the non-contact surface 4e are separated by a distance equal to the thickness t1.

[0061] A portion 82 of the metal foil 80 is disposed in the gap C. That is, the thickness t2 of the metal foil 80 is less than or equal to the thickness t1 of the adhesive material 92. In this embodiment, the thickness t2 is smaller than the thickness t1. For example, the thickness t2 can be less than half the thickness t1. Therefore, the portion 82 is separated from the surface 4b (non-contact surface 4e) of the elastic member 4. In addition, the thickness t2 of the metal foil 80 is the thickness in a direction orthogonal to the plane in which the metal foil 80 extends.

[0062] The thickness t2 of the metal foil 80 is 10 μm or more and 1 mm or less. Preferably, the thickness t2 is 20 μm or more and 500 μm or less. More preferably, the thickness t2 is 50 μm or more and 200 μm or less. For example, the thickness t2 is 100 μm.

[0063] Figure 5 This is a plan view of the elastic member 4 as seen from the Z2 side. The non-contact surface 4e is arranged in a ring shape along the outer periphery of the surface 4b. That is, when viewed from the Z2 side, the non-contact surface 4e surrounds the contact surface 4d. The non-contact surface 4e extends from the end of the ring-shaped connecting surface 4c toward the center of the surface 4b. Furthermore, in... Figure 5 In the diagram, a single-dot dashed line represents the outer periphery of the non-contact surface 4e.

[0064] Part 82 is configured in an annular shape along the annular non-contact surface 4e. Part 82 includes parts 82a and 82b extending in the Y direction and parts 82c and 82d extending in the X direction. Part 82a is disposed on the X1 side relative to part 82b. Part 82c is disposed on the Y1 side relative to part 82d.

[0065] Parts 82a to 82d are integrally formed. That is, the Y1-side end of part 82a is connected to the X1-side end of part 82c. The Y2-side end of part 82a is connected to the X1-side end of part 82d. The Y1-side end of part 82b is connected to the X2-side end of part 82c. The Y2-side end of part 82b is connected to the X2-side end of part 82d. Alternatively, parts 82a to 82d can also be separated from each other (separately configured).

[0066] As described above, in this embodiment, the metal foil 80 includes a portion 81 that covers the surface 4a of the elastic member 4 and is electrically connected to the energy storage module 2, a portion 82 that is electrically connected to the current collector 3, and a connecting portion 83 that connects the portions 81 and 82. Thus, the energy storage module 2 can be electrically connected to the current collector 3 via the metal foil 80 while ensuring uniform surface pressure on the energy storage module 2 through the elastic member 4. Furthermore, the portion 81 can suppress adhesion between the elastic member 4 and the surface 4a of the energy storage module 2.

[0067] In the above embodiment, an example is shown where a portion 82 of the metal foil 80 is disposed in the gap C between the elastic member 4 and the current collector 3, but the present invention is not limited thereto. For example, a portion of the metal foil (equivalent to the "second portion") may not be disposed in the gap C but may be disposed on the side of the current collector 3 (the surface extending along the Z direction).

[0068] The above embodiment shows an example where the non-contact surface 4e is arranged in a ring shape along the outer periphery of the surface 4b of the elastic member 4, but the present invention is not limited thereto. For example, the non-contact surface may be arranged along 1 to 3 of the 4 sides constituting the outer periphery.

[0069] In the above embodiments, an example is shown where the thickness t2 of the metal foil 80 is 10 μm or more and 1 mm or less; however, the present invention is not limited thereto. The thickness t2 of the metal foil 80 can be less than 10 μm or greater than 1 mm.

[0070] In the above embodiments, an example of the restraint device 100 being used in the manufacturing process of the energy storage module is shown, but the present invention is not limited thereto. For example, the energy storage unit (energy storage device) in which the energy storage module is restrained by the restraint device can also be mounted on electronic devices such as electric vehicles.

[0071] For example, Figure 6 The constraint device 200 shown includes end plates 210 and 220, insulating films 230 and 240, bolts 250, and nuts 260. The insulating film 230 is disposed on the lower surface of the end plate 210. The insulating film 240 is disposed on the upper surface of the end plate 220. Additionally, in Figure 6 For simplicity, end plate 210 and end plate 220 are represented by blank blocks. Furthermore, end plate 210 and end plate 220 are examples of the "pressurizing part" of this utility model.

[0072] A laminate 101 comprising multiple energy storage modules 2, multiple conductive plates 103, and multiple elastic members 4 is disposed between insulating films 230 and 240. Conductive plates 103 and elastic members 4 clamping the conductive plates 103 in the Z direction are disposed between the energy storage modules 2. A laminate 101a, formed by stacking energy storage modules 2, elastic members 4, and conductive plates 103 in the order of Z1, and a laminate 101b, formed by stacking energy storage modules 2, elastic members 4, and conductive plates 103 in the order of Z2, are pressurized in the Z direction by end plates 210 and 220. Furthermore, the conductive plate 103 is an example of a "current collector" of this invention.

[0073] The conductive plate 103 is formed of a conductive metallic material. Multiple cooling channels 103a are formed on the conductive plate 103. A cooling medium such as air passes through the cooling channels 103a.

[0074] Conductive plate 103 is also disposed on the lower surface of insulating film 230 and the upper surface of insulating film 240. Positive terminal 300 is connected to conductive plate 103 disposed on the upper surface of insulating film 240. Negative terminal 400 is connected to conductive plate 103 disposed on the lower surface of insulating film 230.

[0075] Bolt 250 and nut 260 connect end plate 210 and end plate 220. Bolt 250 includes a shaft portion 251 and a head 252. Head 252 is disposed at the upper end of shaft portion 251. Head 252 is disposed on the upper surface of end plate 210. A groove corresponding to nut 260 is formed on shaft portion 251.

[0076] The shaft portion 251 of the bolt 250 is formed through the through hole 211 in the end plate 210 and the through hole 221 in the end plate 220. The nut 260 is mounted on the lower end of the shaft portion 251 and disposed on the lower surface of the end plate 220. Thus, the bolt 250 and the nut 260 apply a constraint load in the Z direction to the laminate 101.

[0077] The embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of this invention is not derived from the description of the above embodiments but from the technical solutions shown, and is intended to include all modifications of the same meaning and scope.

Claims

1. A restraint device for restraining an energy storage module, characterized in that, have: Elastic components; The current collector is stacked with the elastic component in the stacking direction; Metal foil, covering the elastic component; and Pressurization section The pressurizing unit applies pressure to the laminated body in the stacking direction, the laminated body being formed by sequentially stacking the energy storage module, the elastic component, and the current collector in the stacking direction. The elastic component includes a first surface and a second surface arranged in the stacking direction. The first surface is disposed in the laminate facing the energy storage module side. The metal foil comprises: The first part covers the first surface and is electrically connected to the energy storage module; The second part is electrically connected to the current collector; and The connecting part connects the first part to the second part.

2. The restraint device according to claim 1, characterized in that, The elastic component includes a connecting surface that connects the first surface and the second surface. The current collector includes a third surface opposite to the second surface in the stacking direction. The connecting portion extends along the connecting surface. The second portion extends along the third surface.

3. The restraint device according to claim 2, characterized in that, It also includes an adhesive material disposed between the current collector and the elastic member, which bonds the current collector and the elastic member together. The second surface has a contact surface that contacts the adhesive material and a non-contact surface that does not contact the adhesive material. A gap corresponding to the thickness of the adhesive material in the lamination direction is formed between the current collector and the non-contact surface. The second part is disposed in the gap.

4. The restraint device according to claim 3, characterized in that, The non-contact surface is arranged in a ring shape along the outer periphery of the second surface. The second portion is configured as a ring along the non-contact surface.

5. The restraint device according to any one of claims 1 to 4, characterized in that, The thickness of the metal foil is more than 10 μm and less than 1 mm.

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