Battery pack and vehicle

Abstract

To provide a battery pack which can suppress exposure of an electric active part of a laminate.SOLUTION: A battery pack 100 includes a plurality of battery modules 10 (laminate) which include a plurality of metal foils 11 (metal plates) stacked on each other in a Z direction (first direction), respectively, and are stacked on each other in the Z direction. The battery pack 100 includes a resin part 50 which is joined to peripheral edge parts 10b of the plurality of battery modules 10, and a case 60 for storing the plurality of battery modules 10. The battery pack 100 includes a stopper 70 (regulation part) which is arranged so as to face the resin part 50 in the case 60. In a direction at which the resin part 50 and the stopper 70 face each other, the width W1 of the resin part 50 is equal to or larger than a distance D between the resin part 50 and the stopper 70.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a battery pack and a vehicle. [Background technology]

[0002] JP 2021-174632 A (Patent Document 1) discloses an energy storage device in which a plurality of energy storage modules are stacked. Each of the plurality of energy storage modules has an electrical connection surface (active part) on an end surface in the stacking direction in order to be electrically connected to the other energy storage modules. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-174632 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, when any of the multiple energy storage modules slides sideways due to vibration or the like, the electrical connection surface (active parts) of the energy storage module may become exposed. Therefore, it is desired to prevent the active parts of the energy storage module (laminated body) from becoming exposed.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a battery pack and a vehicle that are capable of preventing exposure of live parts of a laminate. [Means for solving the problem]

[0006] A battery pack according to a first aspect of the present disclosure includes a plurality of laminates each including a plurality of metal plates laminated together in a first direction, a resin part joined to a peripheral edge of the plurality of laminates, a case for accommodating the plurality of laminates, and a restricting part disposed within the case so as to face the resin part in a second direction perpendicular to the first direction and restricting movement of each of the plurality of laminates. In the second direction, a width of the resin part is equal to or greater than a distance between the resin part and the restricting part.

[0007] In the battery pack according to the first aspect of the present disclosure, as described above, in the second direction in which the resin part and the restricting part face each other, the width of the resin part is equal to or greater than the distance between the resin part and the restricting part. This makes it possible to prevent the one laminate from protruding toward the restricting part relative to the other laminates even if one of the multiple laminates slides sideways and the resin part joined to the one laminate comes into contact with the restricting part. As a result, it is possible to prevent the metal plate (live part) provided at the end of the one laminate in the stacking direction from being exposed.

[0008] In the battery pack according to the first aspect, a conductive plate is preferably provided that is adjacent to at least one of the plurality of laminates in the first direction and is thereby electrically connected to at least one of the laminates. The conductive plate has an overlapping portion that is provided so as to overlap with the resin portion in the first direction. In the second direction, the width of the overlapping portion is equal to or greater than the distance between the resin portion and the restricting portion. With this configuration, when one of the plurality of laminates slides sideways and the resin portion joined to the one laminate comes into contact with the restricting portion, the overlap between the resin portion of the one laminate and the conductive plate is maintained (the overlapping portion remains), so that the live portion can be prevented from protruding from the conductive plate toward the restricting portion. As a result, the live portion can be further prevented from being exposed.

[0009] In the battery pack according to the first aspect, preferably, the peripheral portion of the plurality of laminates to which the resin portion is joined is provided around the entire periphery of the plurality of laminates. The restricting portion is provided so as to surround the entire periphery of the resin portion when viewed along the first direction. The resin portion is formed so that the width in the second direction facing the restricting portion around the entire periphery is equal to or greater than the distance between the resin portion and the restricting portion in the second direction. With this configuration, even if the laminate slides sideways in any direction, it is possible to prevent the live portion from being exposed.

[0010] In the battery pack according to the first aspect, the width of the resin part in the second direction is preferably greater than the thickness of each of the plurality of metal plates in the first direction. With this configuration, the mechanical strength of the resin part can be made relatively large, so that the stack (metal plates) can be more reliably protected when the stack slides sideways and contacts (collides with) the restricting portion.

[0011] In the battery pack according to the first aspect, the restricting portion is preferably made of an insulating resin. With this configuration, even if the stack slides sideways and comes into contact with the restricting portion, insulation between the restricting portion and the stack can be ensured.

[0012] A vehicle according to a second aspect of the present disclosure is equipped with the battery pack according to the first aspect, thereby making it possible to provide a vehicle capable of preventing exposure of live parts of the laminate. Effect of the Invention

[0013] According to the present disclosure, it is possible to prevent the live parts of the laminate from being exposed. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing an electric vehicle equipped with a battery pack according to an embodiment; [Diagram 2] 1 is a cross-sectional view showing a configuration of a battery pack according to one embodiment. [Diagram 3]3 is a partially enlarged view of the vicinity of a gap between a resin portion and a stopper in FIG. 2. [Figure 4] FIG. 2 is a plan view of the battery pack according to one embodiment. [Diagram 5] 1 is a cross-sectional view showing a state in which one battery module in a battery pack of an embodiment slides sideways. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and the description thereof will not be repeated.

[0016] 1 is a diagram showing an electric vehicle 1 equipped with a battery pack 100 according to this embodiment. Note that the electric vehicle 1 is an example of the "vehicle" of the present disclosure.

[0017] As shown in Fig. 2, the battery pack 100 includes a plurality of battery modules 10 stacked on one another in the Z direction. In the example shown in Fig. 2, four battery modules 10 are stacked on one another. The battery modules 10 and the Z direction are examples of the "stack" and "first direction" of the present disclosure, respectively.

[0018] The battery pack 100 also includes a pair of restraining plates 20. The pair of restraining plates 20 clamps the above-mentioned four battery modules 10 in the Z direction using a jig (not shown), thereby fixing the battery modules 10.

[0019] 3, the battery module 10 includes a plurality of blocks 10a each including a metal foil 11, a negative electrode 12, an adhesive separator 13, and a positive electrode 14. In each of the plurality of blocks 10a, the metal foil 11, the negative electrode 12, the adhesive separator 13, and the positive electrode 14 are stacked in this order from the Z2 side.

[0020] In the battery module 10, a plurality of (e.g., 30) blocks 10a are stacked in the Z direction. A metal foil 11 is disposed on the Z1 side of each of the plurality of battery modules 10. That is, the battery module 10 is configured such that the metal foil 11 is disposed on the Z1 side of the plurality of blocks 10a. Therefore, each of the plurality of battery modules 10 is provided so as to be sandwiched between the metal foils 11 in the Z direction. The metal foils 11 on the Z1 side and the Z2 side function as live parts for conducting with the battery modules 10 stacked together in the Z direction via a cooling plate 30 and a conductive plate 40 described later. Note that a current flows from the battery module 10 on the Z1 side to the battery module 10 on the Z2 side.

[0021] The metal foil 11 includes, for example, an aluminum foil. The aluminum foil has a copper-plated surface on the Z1 side. The adhesive separator 13 separates the positive electrode 14 from the negative electrode 12 and adheres the positive electrode 14 to the negative electrode 12.

[0022] As shown in FIG. 2, the battery pack 100 includes a cooling plate 30 and a conductive plate 40. The cooling plate 30 and the conductive plate 40 are sandwiched between the battery modules 10 stacked in the Z direction. Each of the cooling plate 30 and the conductive plate 40 is in contact with the pair of battery modules 10 sandwiching it. This allows the pair of battery modules 10 to be electrically connected to each other. The cooling plate 30 cools each of the pair of battery modules 10. The cooling plate 30 and the conductive plate 40 are provided at different positions in the Z direction. The cooling plate 30 and the conductive plate 40 are examples of the "conductive plate" of the present disclosure.

[0023] The battery pack 100 includes a resin part 50 joined to peripheral parts 10b (see FIG. 1) of the plurality of battery modules 10. Specifically, the resin part 50 is joined to each of the peripheral part 11a (see FIG. 3) of the metal foil 11 and the peripheral part 13a (see FIG. 3) of the adhesive separator 13. The resin part 50 is provided for each of the plurality of battery modules 10.

[0024] 4, the peripheral edge portions 10b of the plurality of battery modules 10 to which the resin portion 50 is joined are provided around the entire periphery of the plurality of battery modules 10. In other words, the resin portion 50 is provided so as to surround the battery module 10 when viewed along the Z direction.

[0025] 2, the battery pack 100 includes a case 60 that houses the multiple battery modules 10. The case 60 has a concave shape. Specifically, the case 60 includes a bottom surface portion 61 on which the multiple battery modules 10 are arranged. The case 60 also includes a side surface portion 62 that is provided so as to surround the entire periphery of the multiple battery modules 10 when viewed from the Z1 side.

[0026] The battery pack 100 also includes a stopper 70 that restricts movement of each of the battery modules 10. Specifically, the stopper 70 restricts movement of each of the battery modules 10 in a plane perpendicular to the Z direction. The stopper 70 is an example of a "restriction portion" of the present disclosure.

[0027] The stopper 70 is disposed between the side surface portion 62 of the case 60 and the multiple battery modules 10. Specifically, as shown in Fig. 4, the stopper 70 is provided so as to surround the entire periphery of the resin portion 50 when viewed along the Z direction (when viewed from the Z1 side).

[0028] The stopper 70 is made of insulating resin. The stopper 70 may be made of resin that is relatively softer than metal, etc. This makes it possible to prevent the battery module 10 from being damaged when the battery module 10 slides (moves in a plane perpendicular to the Z direction) and hits the stopper 70.

[0029] When viewed from the Z1 side, the battery module 10 has a rectangular shape. Therefore, the resin part 50 and the stopper 70 are provided to face each other in a direction perpendicular to each of the four sides of the battery module 10. Each direction in which the resin part 50 and the stopper 70 face each other is an example of the "second direction" of the present disclosure.

[0030] In a conventional battery pack, when any of the battery modules skids due to vehicle vibration or the like, the electrical connection surface (live parts) of the battery module may become exposed. Therefore, it is desired to prevent the live parts of the battery module from becoming exposed.

[0031] 2, in the direction in which the resin part 50 and the stopper 70 face each other, the width W1 of the resin part 50 is equal to or greater than the distance D between the resin part 50 and the stopper 70. In the example shown in FIG. 2, the width W1 of the resin part 50 is greater than the distance D between the resin part 50 and the stopper 70. Note that the width W1 of the resin part 50 means the maximum width of the resin part 50 (the width of the portion not bonded to the metal foil 11 and the adhesive separator 13).

[0032] This makes it possible to prevent the metal foil 11, which is the active part in the battery module 10, from moving to the gap C between the resin part 50 and the stopper 70, even if one battery module 10 slides sideways and collides with the stopper 70, as shown in FIG. 5.

[0033] The cooling plate 30 also includes an overlapping portion 31 provided to overlap the resin part 50 in the Z direction. The conductive plate 40 also includes an overlapping portion 41 (see FIG. 3 ) provided to overlap the resin part 50 in the Z direction. The overlapping portion 31 (41) is a portion that overlaps in the Z direction with the resin part 50 that is joined to a battery module 10 that is not sliding (that is, that is arranged at a specified position).

[0034] In this embodiment, in the direction in which the resin part 50 and the stopper 70 face each other, the width W2 (see FIG. 5) of the overlapping part 31 of the cooling plate 30 is equal to or greater than the distance D between the resin part 50 and the stopper 70. In detail, the width W2 of the overlapping part 31 is greater than the distance D between the resin part 50 and the stopper 70. The width W2 is smaller than the width W1 of the resin part 50.

[0035] This makes it possible to prevent the metal foil 11, which is the active part of the battery module 10, from protruding beyond the cooling plate 30 (overlapping portion 31) toward the stopper 70, even if one battery module 10 slides sideways and collides with the stopper 70, as shown in FIG. 5.

[0036] In addition, in the direction in which the resin part 50 and the stopper 70 face each other, a width W3 (see FIG. 3) of the overlapping part 41 of the conductive plate 40 is larger than a distance D between the resin part 50 and the stopper 70. In the example shown in FIG. 3, the width W3 is equal to the width W1 of the resin part 50.

[0037] 4, the resin part 50 is formed such that the width W1 in the opposing direction of the portion opposing the stopper 70 is greater than the distance D between the resin part 50 and the stopper 70 in the opposing direction over the entire periphery. Similarly, the width W2 (W3) in the opposing direction of the overlapping portion 31 (41) is also formed such that it is greater than the distance D over the entire periphery. The opposing direction is an example of the "second direction" in this disclosure.

[0038] The width W1 of the resin part 50 is larger than the thickness t (see FIG. 3) of each of the metal foils 11 in the Z direction. The width W1 of the resin part 50 may be larger than the thicknesses (not indicated) of the negative electrode 12, the adhesive separator 13, the positive electrode 14, the cooling plate 30, and the conductive plate 40 in the Z direction.

[0039] As described above, in the present embodiment, in the direction in which the resin part 50 and the stopper 70 face each other, the width W1 of the resin part 50 is equal to or greater than the distance D between the resin part 50 and the stopper 70. This makes it possible to reduce the amount of movement (distance of lateral sliding) of the resin part 50 compared to a case in which the distance D is greater than the width W1 of the resin part 50. As a result, it is possible to easily prevent the live parts of the battery module 10 from being exposed.

[0040] In the above embodiment, an example has been shown in which the width W2 (W3) of the overlapping portion 31 (41) of the cooling plate 30 (conductive plate 40) is equal to or greater than the distance D between the resin part 50 and the stopper 70, but the present disclosure is not limited to this. As long as the width W1 of the resin part 50 is equal to or greater than the distance D, the width W2 (W3) of the overlapping portion 31 (41) may be smaller than the distance D.

[0041] In the above embodiment, an example has been described in which the width W1 of the resin part 50 is greater than the distance D between the resin part 50 and the stopper 70, but the present disclosure is not limited to this. The width W1 of the resin part 50 may be equal to the distance D. In addition, the width W2 (W3) of the overlapping portion 31 (41) may be equal to the distance D.

[0042] In the above embodiment, the resin part 50 is formed so that the width W1 is equal to or greater than the distance D between the resin part 50 and the stopper 70 over the entire circumference, but the present disclosure is not limited to this. The width W1 of the resin part 50 may be equal to or greater than the distance D over only a portion of the entire circumference of the resin part 50.

[0043] In the above embodiment, the width W1 of the resin portion 50 is larger than the thickness t of the metal foil 11, but the present disclosure is not limited to this. The width W1 of the resin portion 50 may be equal to or smaller than the thickness t of the metal foil 11.

[0044] In the above embodiment, the stopper 70 is made of resin, but the present disclosure is not limited to this. The stopper 70 may be made of a material other than resin (for example, metal, rubber, etc.).

[0045] In the above embodiment, the battery pack 100 is mounted on the electric vehicle 1, but the present disclosure is not limited to this. The battery pack 100 may be mounted on something other than an electric vehicle (for example, a stationary power storage device, etc.).

[0046] In the above embodiment, the stopper 70 is provided between the resin part 50 and the case 60 (the side surface part 62), but the present disclosure is not limited to this. The stopper 70 may be disposed on the surface of the side surface part 62.

[0047] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0048] 1 electric vehicle (vehicle), 10 battery module (laminated body), 10b peripheral portion, 11 metal foil (metal plate), 30 cooling plate (conductive plate), 31, 41 overlapping portion, 40 conductive plate, 50 resin portion, 60 case, 70 stopper, 100 battery pack, D distance, t thickness, W1 width (width of resin portion), W2, W3 width (width of overlapping portion), Z direction (first direction).

Claims

1. a plurality of battery modules each including a plurality of metal plates stacked on one another in a first direction, the battery modules being stacked on one another in the first direction; a resin portion joined to peripheral portions of the plurality of battery modules; a case that houses the plurality of battery modules; a restricting portion disposed within the case so as to face the resin portion in a second direction perpendicular to the first direction, the restricting portion restricting movement of each of the plurality of battery modules; The resin portion and the restricting portion are not in contact with each other, and a width of the resin portion in the second direction is equal to or greater than a distance between the resin portion and the restricting portion.

2. a conductive plate adjacent to at least one of the plurality of battery modules in the first direction and electrically connected to the at least one battery module, the conductive plate has an overlapping portion provided to overlap the resin portion in the first direction, The battery pack according to claim 1 , wherein a width of the overlapping portion in the second direction is equal to or greater than a distance between the resin portion and the restricting portion.

3. the peripheral portions of the battery modules to which the resin portion is joined are provided along entire peripheries of the battery modules, The restricting portion is provided so as to surround an entire periphery of the resin portion as viewed along the first direction, 3. The battery pack according to claim 1, wherein the resin portion is formed so that a width in the second direction facing the restricting portion around the entire circumference is equal to or greater than a distance between the resin portion and the restricting portion in the second direction.

4. The battery pack according to claim 1 , wherein a width of the resin portion in the second direction is greater than a thickness of each of the plurality of metal plates in the first direction.

5. The battery pack according to claim 1 , wherein the restricting portion is made of an insulating resin.

6. the case includes a bottom surface portion on which the plurality of battery modules are arranged, 3. The battery pack according to claim 1, wherein the restricting portion extends in the first direction from a position where the bottom surface portion is provided to a position where a battery module among the plurality of battery modules that is farthest from the bottom surface portion is provided.

7. A vehicle comprising the battery pack according to claim 1.

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