restraining member

Abstract

The utility model provides a kind of restraining member that can be inhibited at the same time, the constraint part flexure is inhibited in the constraint part large-scale. Restraining member has: first constraint part, it is set in one side of laminating direction relative to laminated body;And second constraint part, it is set in the other side of laminating direction relative to laminated body, first constraint part includes: first plate part and second plate part, arrange in laminating direction;And connecting structure body, it is set between first plate part and second plate part, and connect first plate part and second plate part, connecting structure body has: first connecting portion, it intersects with laminating direction;And second connecting portion, it intersects with first connecting portion.

Description

Technical Field

[0001] This disclosure relates to a constraint. Background Technology

[0002] Japanese Patent Application Publication No. 2019-216073 (Patent Document 1) discloses a constraint part for applying 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.

[0003] Patent document 1: Japanese Patent Application Publication No. 2019-216073.

[0004] When applying constraint loads to multiple energy storage modules using the constraint part described in Patent Document 1, a large load is applied to a pair of constraint plates. In this case, although the thickness of the constraint plates can be increased to suppress the deflection of the constraint plates, this would result in the constraint plates (constraint parts) becoming larger. Utility Model Content

[0005] This invention was developed to solve the aforementioned problems, and its purpose is to provide a constraint member that can suppress the deflection of the constraint part while suppressing the enlargement of the constraint part.

[0006] One aspect of this disclosure is a constraint for constraining a stack of at least one energy storage module stacked in a stacking direction, comprising: a first constraint portion disposed on one side of the stacking direction relative to the stack; and a second constraint portion disposed on the other side of the stacking direction relative to the stack, the first constraint portion comprising: a first plate portion and a second plate portion arranged in the stacking direction; and a connecting structure disposed between the first plate portion and the second plate portion and connecting the first plate portion and the second plate portion, the connecting structure having: a first connecting portion intersecting the stacking direction; and a second connecting portion intersecting the first connecting portion.

[0007] As described above, in one aspect of the constraint member of this disclosure, the connecting structure has a first connecting portion intersecting the lamination direction and a second connecting portion intersecting the first connecting portion. This allows the load acting on the first constraint portion in the lamination direction to be distributed in the direction intersecting the lamination direction (along the direction of the first connecting portion). Therefore, deflection of the first constraint portion in the lamination direction can be suppressed. Thus, even without thickening the first constraint portion (first plate portion, second plate portion) in the lamination direction, deflection of the first constraint portion can be suppressed. Therefore, it is possible to suppress the enlargement of the first constraint portion while simultaneously suppressing its deflection.

[0008] The second connecting portion may intersect the first connecting portion and the stacking direction. If a virtual axis extending in the stacking direction between the first and second connecting portions is defined as the virtual axis, then when the first connecting portion extends from the first plate side to the second plate side, it extends in a direction away from this virtual axis, and the second connecting portion also extends from the first plate side to the second plate side, in a direction away from this virtual axis. With this structure, the first and second connecting portions can be symmetrically arranged with respect to the virtual axis. Therefore, it is easier to evenly distribute the load acting on the first constraint portion in the stacking direction between the first and second connecting portions. As a result, since the first and second connecting portions can easily maintain a balanced state, the connection structure can be stably maintained.

[0009] At each location along the stacking direction, the distance between the first connecting portion and the virtual axis can be equal to the distance between the second connecting portion and the virtual axis. This structure allows the load acting on the first constraint portion along the stacking direction to be shared and evenly distributed by the first and second connecting portions.

[0010] The second connecting portion can extend in the stacking direction. With this structure, the second connecting portion can be shortened compared to the case where the second connecting portion intersects with the stacking direction.

[0011] The connecting structure may include multiple rows of connecting parts, in which first connecting parts and second connecting parts are arranged alternately in a first direction. The multiple rows of connecting parts may be arranged in a second direction intersecting the first direction. This structure allows constraint loads to be distributed across multiple rows of connecting parts.

[0012] According to this disclosure, it is possible to suppress the enlargement of the restraint part while suppressing the deflection of the restraint part. Attached Figure Description

[0013] Figure 1 This is a perspective view showing the structure of the constraint member and the laminate in one embodiment.

[0014] Figure 2 for Figure 1 The exploded diagram.

[0015] Figure 3 This is a perspective view showing the detailed structure of the end plate of the constraint member according to one embodiment.

[0016] Figure 4 This is a side view showing the structure of the end plate of the constraint member according to one embodiment.

[0017] Figure 5 This is a side view showing the structure of the end plate of the constraint member in a first modified embodiment.

[0018] Figure 6This is a side view showing the structure of the end plate of the constraint member in a second variation of an embodiment.

[0019] Figure 7 This is a cross-sectional view showing the structure of the constraint member and the laminate in a modified embodiment. Detailed Implementation

[0020] The embodiments of this disclosure 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.

[0021] Reference Figures 1 to 4 The constraint member 100 of the embodiments of this disclosure will be described. The constraint member 100 is a fixture that constrains the energy storage module during the manufacturing process of the energy storage device. In addition, the energy storage module may be, for example, a secondary battery such as a lithium-ion secondary battery.

[0022] Figure 1 This is a schematic perspective view showing the state in which the laminate 1 is constrained by the constraint member 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. Furthermore, the X and Y directions are examples of the "first direction" and "second direction" of this disclosure, respectively. The Z direction is an example of the "lamination direction" of this disclosure.

[0023] The constraint member 100 has end plates 10 and 20 and constraint components 30 and 40. The constraint member 100 applies a constraint load to the laminate 1 in the Z direction. The laminate 1 is held in the Z direction by the end plates 10 and 20. The end plate 10 is disposed on the Z1 side relative to the laminate 1. The end plate 20 is disposed on the Z2 side relative to the laminate 1. In addition, the end plates 10 and 20 are examples of the "first constraint part" and "second constraint part" of this disclosure, respectively.

[0024] 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.

[0025] Figure 2 This is an exploded perspective view showing the laminate 1 and the constraint member 100. The laminate 1 is formed, for example, in a cuboid shape. The laminate 1 includes multiple energy storage modules 2 and multiple conductive plates 3.

[0026] The energy storage module 2 includes multiple cell units (not shown) and a frame. The cell units are, for example, bipolar batteries. Multiple adjacent cell units 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 such that the second current collector is adjacent to the first current collector in the Z-direction. 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.

[0027] The conductive plate 3 is stacked in the Z direction with the energy storage module 2 sandwiched in the middle.

[0028] The constraint member 100 has elastic plates 50 and 60. Elastic plate 50 is disposed between end plate 10 and laminate 1, and is clamped by end plate 10 and laminate 1 in the Z direction. Elastic plate 60 is disposed between end plate 20 and laminate 1, and is clamped by end plate 20 and laminate 1 in the Z direction. Through elastic plates 50 and 60, a uniform constraint load can be applied to laminate 1.

[0029] End plates 10 and 20 are plate-shaped components. When viewed from the Z1 side away from the end plate 10, end plate 10 has a rectangular shape covering the laminate 1. When viewed from the Z2 side away from the end plate 20, end plate 20 has a rectangular shape covering the laminate 1.

[0030] The end plate 10 includes a first plate 11 and a second plate 12. 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. Furthermore, the first plate 11 and the second plate 12 are examples of the "first plate portion" and "second plate portion" of this disclosure, respectively.

[0031] End plate 10 includes a connecting structure 13. The connecting structure 13 is disposed between the first plate 11 and the second plate 12, connecting the first plate 11 and the second plate 12. The connecting structure 13 has a Warren truss structure. The detailed structure of the connecting structure 13 will be described later.

[0032] A plurality of (five in this embodiment) cuts 11a and a plurality of (five in this embodiment) cuts 11b are formed on the first plate 11. The plurality of cuts 11a are arranged side by side along the X1 side of the first plate 11. The plurality of cuts 11b are arranged side by side along the X2 side of the first plate 11.

[0033] A plurality of cuts 12b are formed on the second plate 12, which are located below the cuts 11b of the first plate 11. That is, the plurality of cuts 12b overlap with the plurality of cuts 11b in the Z direction.

[0034] In addition, although Figure 2Not shown in the figure, but multiple cuts are formed on the second plate 12 below the cut 11a of the first plate 11. These multiple cuts overlap with the multiple cuts 11a in the Z direction.

[0035] End plate 20 has the same structure as end plate 10. That is, end plate 20 includes a first plate 21, a second plate 22, and a connecting structure 23. Multiple cuts 21a and multiple cuts 21b are formed on the first plate 21. Multiple cuts 22b and multiple cuts (not shown) overlapping with the cuts 21a in the Z direction are formed on the second plate 22. Furthermore, the first plate 21 and the second plate 22 are examples of the "first plate portion" and "second plate portion" of this disclosure, respectively.

[0036] Constraint members 30 and 40 sandwich the laminate 1 in the X direction and are arranged at intervals. Constraint member 30 is provided on the X1 side of the laminate 1. Constraint member 40 is provided on the X2 side of the laminate 1. Constraint member 30 has the same shape as constraint member 40. Therefore, only the structure of constraint member 40 will be described in detail below.

[0037] 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.

[0038] 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.

[0039] With the stacked body 1 constrained by the constraint member 40, multiple column members 42 respectively penetrate the overlapping cuts 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 sandwiched between the upper frame 41a and the lower frame 41b.

[0040] 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.

[0041] With the laminate 1 constrained by the constraint member 30, multiple column members 32 respectively penetrate the cuts 11a and 21a arranged in the Z direction and the cuts (not shown) formed on the second plate 12 and the second plate 22. 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 laminate 1, end plate 10, and end plate 20 are sandwiched between the upper frame 31a and the lower frame 31b.

[0042] The constraint member 100 has a protective member 70, a protective member 71, a protective member 72 and a protective member 73.

[0043] Protective member 70 and protective member 71 are respectively disposed between constraining member 30 and constraining member 40, and 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.

[0044] Protective member 72 and protective member 73 are respectively disposed between constraining member 30 and constraining member 40, and 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.

[0045] Figure 3 This is a perspective view showing the detailed structure of end plate 10 and end plate 20. Furthermore, for simplicity, the cuts formed on each end plate are omitted. Figure 2 The diagram is shown, and the diagrams other than those of the end plates are omitted.

[0046] The connecting structure 13 includes a plurality of connecting portions 13a and a plurality of connecting portions 13b. The plurality of connecting portions 13a extend from the first plate 11 to the second plate 12, respectively. The plurality of connecting portions 13a are connected to the first plate 11 and the second plate 12, respectively (e.g., pin engagement). The plurality of connecting portions 13b extend from the first plate 11 to the second plate 12, respectively. The plurality of connecting portions 13b are connected to the first plate 11 and the second plate 12, respectively (e.g., pin engagement). Furthermore, connecting portions 13a and 13b are examples of the "first connecting portion" and "second connecting portion" of this disclosure, respectively.

[0047] The connecting structure 23 includes a plurality of connecting portions 23a and a plurality of connecting portions 23b. The plurality of connecting portions 23a extend from the first plate 21 to the second plate 22, respectively. The plurality of connecting portions 23a are connected to the first plate 21 and the second plate 22, respectively (e.g., pin engagement). The plurality of connecting portions 23b extend from the first plate 21 to the second plate 22, respectively. The plurality of connecting portions 23b are connected to the first plate 21 and the second plate 22, respectively (e.g., pin engagement). Furthermore, connecting portions 23a and 23b are examples of the "first connecting portion" and "second connecting portion" of this disclosure, respectively.

[0048] In existing constraint components, when constraint loads are applied to multiple energy storage modules, a large load is also applied to a pair of end plates. While increasing the thickness of the end plates can suppress deflection, this results in a larger constraint component.

[0049] Therefore, in this embodiment, the connecting structure 13 is configured such that a plurality of connecting portions 13a intersect the Z direction, and a plurality of connecting portions 13b intersect the connecting portions 13a. Each of the plurality of connecting portions 13b also intersects the Z direction.

[0050] Furthermore, the connecting structure 23 is configured such that multiple connecting portions 23a intersect the Z direction, and multiple connecting portions 23b intersect the connecting portions 23a. Each of the multiple connecting portions 23b also intersects the Z direction.

[0051] The connecting structure 13 includes connecting portion rows 13c in which connecting portions 13a and 13b are alternately arranged in the X direction. The connecting structure 13 includes a plurality of (10 in this embodiment) connecting portion rows 13c. The plurality of connecting portion rows 13c are arranged in the Y direction. In each connecting portion row 13c, a plurality of (9 in this embodiment) V-shaped structures formed by adjacent connecting portions 13a and 13b in the X direction are arranged in the X direction.

[0052] Connecting portion 13a and connecting portion 13b have widths W1 and W2 respectively in the Y direction. Widths W1 and W2 are equal.

[0053] The connecting structure 23 includes connecting part rows 23c in which connecting parts 23a and 23b are alternately arranged in the X direction. The connecting structure 23 includes a plurality of (10 in this embodiment) connecting part rows 23c. The plurality of connecting part rows 23c are arranged in the Y direction. In each connecting part row 23c, a plurality of (9 in this embodiment) inverted V-shaped structures formed by adjacent connecting parts 23a and 23b in the X direction are arranged in the X direction.

[0054] Connecting portions 23a and 23b have widths W3 and W4 respectively in the Y direction. Widths W3 and W4 are equal. Furthermore, widths W3 and W4 are equal to widths W1 and W2.

[0055] Figure 4 This shows the side view of end plate 10 and end plate 20 respectively. Figure 4 The axis α shown is a virtual axis extending in the Z direction between connecting part 13a and connecting part 13b. The axis β is a virtual axis extending in the Z direction between connecting part 23a and connecting part 23b. Furthermore, in Figure 4 For simplicity, illustrations other than those for each end plate have been omitted.

[0056] The connecting portion 13a extends from the second plate 12 side toward the first plate 11 side in a direction away from the axis α. Specifically, the connecting portion 13a is inclined relative to the axis α in such a way that it extends toward the X1 side as it moves toward the Z1 side. The connecting portion 13b extends from the second plate 12 side toward the first plate 11 side in a direction away from the axis α. Specifically, the connecting portion 13b is inclined relative to the axis α in such a way that it extends toward the X2 side as it moves toward the Z1 side.

[0057] In detail, at all positions in the Z direction, the distance D1 between the connecting part 13a and the axis α is equal to the distance D2 between the connecting part 13b and the axis α. In other words, regardless of the position in the Z direction, distance D1 and distance D2 are equal. The angle θ1 of inclination of the connecting part 13a relative to the axis α is equal to the angle θ2 of inclination of the connecting part 13b relative to the axis α. Furthermore, the minimum value of both distance D1 and distance D2 is 0.

[0058] The connecting portion 23a extends from the first plate 21 side toward the second plate 22 side in a direction away from the axis β. Specifically, the connecting portion 23a is inclined relative to the axis β in such a way that it extends toward the X2 side as it moves toward the Z2 side. The connecting portion 23b extends from the first plate 21 side toward the second plate 22 side in a direction away from the axis β. Specifically, the connecting portion 23b is inclined relative to the axis β in such a way that it extends toward the X1 side as it moves toward the Z2 side.

[0059] In detail, at each position in the Z direction, the distance D3 between the connecting part 23a and the axis β is equal to the distance D4 between the connecting part 23b and the axis β. In other words, regardless of the position in the Z direction, distances D3 and D4 are equal. The angle θ3 of inclination of the connecting part 23a relative to the axis β is equal to the angle θ4 of inclination of the connecting part 23b relative to the axis β. Furthermore, the minimum value of both distances D3 and D4 is 0. Additionally, angles θ3 and θ4 are equal to angles θ1 and θ2. For example, angles θ1 to θ4 are all 30 degrees.

[0060] like Figure 4 As shown, axes α and β can also overlap in the Z direction. That is, the connection point P1 where adjacent connecting parts 13a and 13b in the X direction meet in the second plate 12, and the connection point P2 where adjacent connecting parts 23a and 23b in the X direction meet in the first plate 21, overlap in the Z direction. In addition, connection points P1 and P2 extend in the Y direction.

[0061] The first plate 11 and the second plate 12 are separated by a distance D11 in the Z direction. The first plate 21 and the second plate 22 are separated by a distance D12 in the Z direction. The distance D11 is equal to the distance D12.

[0062] Additionally, the distance from D11 is greater than the width W1 in the Y direction of the connecting part 13a. Figure 3 The width W2 in the Y direction of the connecting part 13b () and the width W2 in the connecting part 13b Figure 3 The distance D12 is larger than the width W3 in the Y direction of the connecting part 23a. Figure 3 The width W4 in the Y direction of the connecting part 23b () and the width W4 in the connecting part 23b Figure 3 )big.

[0063] As described above, in this embodiment, the connecting portion 13a intersects the Z direction, and the connecting portion 13b intersects both the connecting portion 13a and the Z direction. Therefore, the constraint load applied in the Z direction by the constraint member 100 can be distributed along the connecting portions 13a and 13b in the directions intersecting the Z direction. As a result, deflection of the end plate 10 in the stacking direction can be suppressed. Thus, it is possible to suppress the enlargement of the end plate 10 while simultaneously suppressing its deflection.

[0064] Furthermore, a truss structure is used to connect the two ends of connecting parts 13a and 13b by pinning them together, forming a triangle. As a result, no bending moment is generated in connecting parts 13a and 13b, but only axial force is generated, thus easily improving the mechanical strength (structural stability) of the connecting structure 13.

[0065] Furthermore, as described above, since no bending moment is generated in the connecting portions 13a and 13b, but only axial force is generated, it is easy to make the connecting portions 13a and 13b thinner (smaller). As a result, it is easy to make the connecting structure 13 lightweight.

[0066] Furthermore, these effects can also be achieved in an end plate 20 having the same structure as end plate 10.

[0067] The above embodiment shows an example where the connecting portion 13b (23b) intersects with the Z direction, but this disclosure is not limited thereto.

[0068] For example, in Figure 5In the first modified example shown, end plate 110 is illustrated. Figure 5 In this embodiment, the same structural reference numerals as those in the above embodiment are used. The end plate 110 includes a connecting structure 113 disposed between the first plate 11 and the second plate 12. Figure 5 The diagram illustrates one of the multiple connecting sections 113c included in the connecting structure 113. The connecting structure 113 has a platform truss structure. Additionally, the end plate 110 is an example of the "first constraint part" of this disclosure.

[0069] The connecting portion row 113c includes connecting portion 113a, connecting portion 113b, connecting portion 113d, and connecting portion 113e. Connecting portion 113e is located at the center of the connecting portion row 113c in the X direction. The connecting portion row 113c is configured as a left-right symmetrical structure on the X1 and X2 sides relative to connecting portion 113e. Connecting portion 113e extends in the Z direction. Furthermore, if connecting portion 113b and connecting portion 113e are respectively the "second connecting portion" of this disclosure, then connecting portion 113a and connecting portion 113d are respectively equivalent to the "first connecting portion" of this disclosure. If connecting portion 113d is the "second connecting portion" of this disclosure, then connecting portion 113a is equivalent to the "first connecting portion" of this disclosure, and the first plate 11 and the second plate 12 are respectively equivalent to the "second plate portion" and the "first plate portion" of this disclosure.

[0070] On the X1 side of the connecting portion 113e, connecting portions 113a and 113b are arranged alternately in the X direction. Connecting portion 113a intersects the Z direction. Connecting portion 113b extends in the Z direction. Connecting portion 113a is inclined in such a way that it extends towards the X1 side from the side of the second plate 12 toward the side of the first plate 11. The angle θ11 between connecting portion 113a and the second plate 12 (first plate 11) is, for example, 45 degrees. The angle θ12 between connecting portion 113b and the second plate 12 (first plate 11) is 90 degrees.

[0071] On the X2 side of the connecting portion 113e, connecting portions 113d and 113b are arranged alternately in the X direction. Connecting portion 113d intersects the Z direction. Connecting portion 113d is inclined in such a way that it extends towards the X2 side from the side of the second plate 12 toward the side of the first plate 11. The angle θ13 between connecting portion 113d and the second plate 12 (first plate 11) is, for example, 45 degrees.

[0072] The connecting portion 113e is held between connecting portions 113a and 113d in the X direction. Connecting portion 113a extends away from connecting portion 113e as it moves from the second plate 12 side toward the first plate 11 side. Connecting portion 113d extends away from connecting portion 113e as it moves from the second plate 12 side toward the first plate 11 side. At each position in the Z direction, the distance D11 between connecting portions 113a and 113e is equal to the distance D12 between connecting portions 113d and 113e. In other words, regardless of the position in the Z direction, distances D11 and D12 are equal.

[0073] exist Figure 6 The second variation shown illustrates end plate 210. Figure 6 In the above-mentioned first variation ( Figure 5 The same structural reference numerals are used as those in the first modified example described above. The end plate 210 includes a connecting structure 213 disposed between the first plate 11 and the second plate 12. Figure 6 The diagram illustrates one of the multiple connection segments 213c included in the connection structure 213. The connection structure 213 has a Howe truss structure. Additionally, the end plate 210 is an example of the "first constraint" of this disclosure.

[0074] The connecting portion array 213c includes connecting portion 213a, connecting portion 113b, connecting portion 213d, and connecting portion 113e. Connecting portion 113e is disposed at the center of the connecting portion array 213c in the X direction. The connecting portion array 213c is configured with a left-right symmetrical structure on the X1 and X2 sides relative to connecting portion 113e. Furthermore, if connecting portion 113b and connecting portion 113e are respectively the "second connecting portion" of this disclosure, then connecting portion 213a and connecting portion 213d are respectively equivalent to the "first connecting portion" of this disclosure. If connecting portion 213d is the "second connecting portion" of this disclosure, then connecting portion 213a is equivalent to the "first connecting portion" of this disclosure, and the first plate 11 and the second plate 12 are respectively equivalent to the "first plate portion" and the "second plate portion" of this disclosure.

[0075] On the X1 side of the connecting portion 113e, connecting portions 213a and 113b are arranged alternately in the X direction. Connecting portion 213a intersects the Z direction. Connecting portion 213a is inclined in such a way that it extends towards the X2 side from the side of the second plate 12 toward the side of the first plate 11. The angle θ21 between connecting portion 213a and the second plate 12 (first plate 11) is, for example, 45 degrees.

[0076] On the X2 side of the connecting portion 113e, connecting portions 213d and 113b are arranged alternately in the X direction. Connecting portion 213d intersects the Z direction. Connecting portion 213d is inclined in such a way that it extends towards the X1 side from the side of the second plate 12 toward the side of the first plate 11. The angle θ22 between connecting portion 213d and the second plate 12 (first plate 11) is, for example, 45 degrees.

[0077] The connecting portion 113e is held in the X direction by connecting portions 213a and 213d. Connecting portion 213a extends away from connecting portion 113e as it moves from the first plate 11 side toward the second plate 12 side. Connecting portion 213d extends away from connecting portion 113e as it moves from the first plate 11 side toward the second plate 12 side. At each position in the Z direction, the distance D21 between connecting portions 213a and 113e is equal to the distance D22 between connecting portions 213d and 113e. In other words, regardless of the position in the Z direction, distances D21 and D22 are equal.

[0078] The above embodiments illustrate an example of the use of the constraint member 100 in the manufacturing process of an energy storage device, but this disclosure is not limited thereto. For example, an energy storage device constrained by the constraint member may also be mounted in electronic devices such as electric vehicles.

[0079] For example, Figure 7 The constraint member 300 shown includes end plates 310 and 320, insulating films 330 and 340, bolts 350, and nuts 360. The insulating film 330 is disposed on the lower surface of the end plate 310. The insulating film 340 is disposed on the upper surface of the end plate 320. Additionally, in... Figure 7 For simplicity, end plate 310 and end plate 320 are represented by blank blocks, respectively. Furthermore, end plate 310 and end plate 320 are examples of the "first constraint part" and "second constraint part" of this disclosure, respectively.

[0080] A laminate 1a comprising multiple energy storage modules 2 and multiple conductive plates 4 is disposed between insulating films 330 and 340. The conductive plates 4 are disposed between the energy storage modules 2. The conductive plates 4 are formed of a conductive metallic material and electrically connect adjacent energy storage modules 2 in the Z direction. Multiple cooling passages 4a are formed on the conductive plates 4. Furthermore, a refrigerant such as air can circulate within the cooling passages 4a.

[0081] Conductive plate 4 is also disposed on the lower surface of insulating film 330 and the upper surface of insulating film 340. Positive terminal 400 is connected to conductive plate 4 disposed on the upper surface of insulating film 340. Negative terminal 500 is connected to conductive plate 4 disposed on the lower surface of insulating film 330.

[0082] Bolt 350 and nut 360 connect end plate 310 and end plate 320. Bolt 350 includes a shaft portion 351 and a head 352. Head 352 is disposed at the upper end of shaft portion 351. Head 352 is disposed on the upper surface of end plate 310. A groove corresponding to nut 360 is formed on shaft portion 351.

[0083] The shaft portion 351 of the bolt 350 passes through the through hole 311 in the end plate 310 and the through hole 321 in the end plate 320. The nut 360 is mounted on the lower end of the shaft portion 351 and is disposed on the lower surface of the end plate 320. Thus, the bolt 350 and the nut 360 apply a constraint load in the Z direction to the laminate 1a.

[0084] In the above embodiments, examples are shown where end plate 10 and end plate 20 each have a truss structure, but this disclosure is not limited thereto. It is also possible for only one of end plate 10 and end plate 20 to have a truss structure.

[0085] The above embodiments illustrate an example of the constraint member 100 constraining multiple energy storage modules 2, but this disclosure is not limited thereto. The constraint member 100 may also be used to constrain a single energy storage module 2, in which case the energy storage module 2 and the elastic sheets 50, 60 correspond to the "stack" of this disclosure.

[0086] The above embodiment shows an example in which multiple connecting portions 13a and 13b are provided in the end plate 10, but the present disclosure is not limited thereto. For example, only one connecting portion 13a and one connecting portion 13b may be provided in the end plate 10. This variation can also be applied to the end plate 20.

[0087] The embodiments disclosed herein should be understood as exemplary in all respects and not restrictive. The scope of this disclosure is set forth not by the description of the above embodiments but by the claims, and is intended to include all modifications of the same meaning and scope as the claims.

Claims

1. A restraint member for restraining a stack of at least one power storage module stacked in a stacking direction, characterized by, have: The first constraint portion is disposed on one side of the stacking direction relative to the stacked body; and The second constraint portion is disposed on the opposite side of the stacking direction relative to the stacked body. The first constraint unit includes: The first plate portion and the second plate portion are arranged in the stacking direction; and A connecting structure is disposed between the first plate portion and the second plate portion, and connects the first plate portion and the second plate portion. The connecting structure has: The first connecting portion intersects the stacking direction; and The second connecting part intersects with the first connecting part.

2. A restraint according to claim 1, wherein, The second connecting portion intersects with the first connecting portion and the stacking direction. A virtual axis extending in the stacking direction between the first connecting portion and the second connecting portion is defined as a virtual axis. When the first connecting portion extends from the first plate portion side to the second plate portion side, it extends in a direction away from the virtual axis. When the second connecting portion extends from the first plate portion side to the second plate portion side, it extends in a direction away from the virtual axis.

3. A restraint according to claim 2, wherein, At each position in the stacking direction, the distance between the first connecting portion and the virtual axis and the distance between the second connecting portion and the virtual axis are equal.

4. The restraint of claim 1, wherein, The second connecting portion extends in the stacking direction.

5. Restraint according to any one of claims 1 to 4, characterized in that The connecting structure includes multiple rows of connecting parts, in which the first connecting part and the second connecting part are arranged alternately in a first direction. The plurality of connecting parts are arranged in a second direction intersecting the first direction.

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