Battery module

Abstract

To provide a battery module that can drain dew condensation water, etc. accumulated on a bottom cover without delay even when the battery module is tilted.SOLUTION: A battery module has a laminate including a plurality of battery cells arranged side-by-side in a first direction and having a rectangular-shaped housing and electrode terminals provided on the housing, respectively; a constraining member provided in a second direction orthogonal to the first direction for the plurality of battery cells and restraining the laminate along the first direction; and an insulating cover member provided to cover the laminate from the opposite side of the electrode terminals in a third direction orthogonal to the first direction and the second direction. The cover member includes a first drainage portion located at a center portion of the cover member in the second direction and a second drainage portion located at both ends of the cover member in the second direction.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] This technology relates to a battery module.

Background Art

[0002] As shown in Patent Documents 1 to 6, in battery modules and battery packs, it has conventionally been practiced to provide a drainage section for draining condensed water that accumulates at the bottom.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a battery module used for in - vehicle applications or the like, the battery module may tilt due to the external environment. Even in such a case, it is required to drain condensed water or the like without any delay.

[0005] An object of this technology is to provide a battery module capable of draining condensed water or the like that accumulates on the bottom cover without any delay even when the battery module is tilted.

Means for Solving the Problems

[0006] The present technology provides the following battery module.

[0007] [1] A laminate including a plurality of battery cells each having a rectangular-shaped casing arranged side by side in a first direction and electrode terminals provided on the casing, a restraining member provided so as to be arranged side by side in a second direction orthogonal to the first direction with respect to the plurality of battery cells and restraining the laminate along the first direction, and an insulating cover member provided so as to cover the laminate from the opposite side of the electrode terminals in a third direction orthogonal to the first direction and the second direction, the cover member including a first drainage portion located at the center of the cover member in the second direction and a second drainage portion located at both ends of the cover member in the second direction.

[0008] [2] The battery module according to [1], wherein at least one of the first drainage portion and the second drainage portion includes a through hole provided in the cover member.

[0009] [3] The battery module according to [2], wherein a flange portion protruding to the opposite side of the laminate is formed at the edge of the through hole.

[0010] [4] The battery module according to [2] or [3], further including a biasing portion provided at the edge of the through hole and biasing the laminate in a direction away from the cover member.

[0011] [5] The battery module according to any one of [1] to [4], wherein at least one of the first drainage portion and the second drainage portion includes a groove portion provided at an end of the cover member in the first direction.

[0012] [6] The battery module according to any one of [1] to [5], wherein the cover member has an inclined surface inclined in a direction away from the laminate toward the first drainage portion located at the center of the cover member in the second direction.

[0013] [7] The battery module according to any one of [1] to [6], wherein the laminate further includes a case that houses a plurality of battery cells and supports them at least in the first direction and forms a unit including the plurality of battery cells.

[0014] The battery module according to [7], wherein the [8] unit includes two or more battery cells, and the output density of each of the two or more battery cells is 8000 W / L or more.

Advantages of the Invention

[0015] According to the present technology, even when the battery module is tilted, drainage such as condensed water accumulated on the bottom cover of the battery module can be performed smoothly.

Brief Description of the Drawings

[0016]

Figure 1

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Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present technology will be described. In cases where the same or corresponding parts are denoted by the same reference numerals, the description may not be repeated.

[0018] In the embodiments described below, when referring to the number, amount, etc., unless otherwise specified, the scope of the present technology is not necessarily limited to such number, amount, etc. Also, in the following embodiments, each component is not necessarily essential for the present technology, unless otherwise specified. Further, the present technology is not limited to necessarily exhibiting all of the effects mentioned in the present embodiments.

[0019] In this specification, the descriptions of "comprise", "include", and "have" are in an open - ended format. That is, when including a certain configuration, other configurations outside the said configuration may or may not be included.

[0020] Also, in this specification, when geometric terms and terms representing positional and directional relationships, such as "parallel", "orthogonal", "diagonal 45°", "coaxial", "along", etc. are used, those terms allow for manufacturing errors or slight variations. When terms representing relative positional relationships such as "upper side", "lower side", etc. are used in this specification, those terms are used to indicate the relative positional relationship in one state, and depending on the installation direction of each mechanism (for example, turning the entire mechanism upside down, etc.), the relative positional relationship can be reversed or rotated at an arbitrary angle.

[0021] In this specification, the "battery" is not limited to a lithium-ion battery, and may include other batteries such as nickel-metal hydride batteries and sodium-ion batteries. In this specification, the "electrode" may generically refer to the positive electrode and the negative electrode.

[0022] FIGS. 1 and 2 are perspective views showing a battery module according to an embodiment of the present invention. FIG. 3 is an exploded assembly view showing the battery module in FIGS. 1 and 2. FIG. 4 is a perspective view showing a battery cell unit constituting the battery module in FIG. 1. FIG. 5 is a perspective view showing a battery cell constituting the battery cell unit in FIG. 1.

[0023] Referring to FIGS. 1 to 5, the battery module 1 is used as a driving power source for a vehicle such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a battery electric vehicle (BEV).

[0024] In this specification, for the convenience of explaining the structure of the battery module 1, an axis extending parallel to the stacking direction of a plurality of battery cells 11 described later is referred to as the "Y-axis". Based on the "Y-axis", an axis extending in a direction orthogonal to the Y-axis is referred to as the "X-axis", and an axis extending in a direction orthogonal to both the Y-axis and the X-axis is referred to as the "Z-axis". The upper right diagonal direction on the paper surface of FIG. 1 is the "+Y-axis direction", and the lower left diagonal direction is the "-Y-axis direction". The lower right diagonal direction on the paper surface of FIG. 1 is the "+X-axis direction", and the upper left diagonal direction is the "-X-axis direction". The upper direction on the paper surface of FIG. 1 is the "+Z-axis direction", and the lower direction is the "-Z-axis direction". Typically, the battery module 1 is mounted on the vehicle in a posture where the +Z-axis direction corresponds to the upward direction and the -Z-axis direction corresponds to the downward direction.

[0025] First, the overall structure of the battery module 1 will be described. As shown in FIG. 3, the battery module 1 has a plurality of battery cell units 21 (21A, 21B, 21C, 21D, 21E, 21F).

[0026] The plurality of battery cell units 21 are arranged in the Y-axis direction. The battery cell units 21A, 21B, 21C, 21D, 21E, and 21F are arranged in order from the negative side to the positive side in the Y-axis direction. Note that the number of battery cell units 21 provided in the battery module 1 is not particularly limited as long as it is 2 or more.

[0027] As shown in FIGS. 4 and 5, each of the battery cell units 21A to 21F of the battery cell units 21 has a plurality of battery cells 11 and a case body 31.

[0028] In each battery cell unit 21, two battery cells 11 are arranged continuously in the Y-axis direction. The number of battery cells 11 provided in each battery cell unit 21 is not particularly limited as long as it is plural.

[0029] The battery cell 11 is a lithium-ion battery. As an example, the battery cell 11 may have an output density of 8000 W / L or more. The battery cell 11 has a rectangular shape. More specifically, the battery cell 11 has a rectangular parallelepiped thin plate shape. The plurality of battery cells 11 are stacked such that the Y-axis direction is the thickness direction of the battery cell 11.

[0030] The battery cell 11 has an exterior body 12. The exterior body 12 is formed of a rectangular parallelepiped housing and forms the appearance of the battery cell 11. The electrode body and the electrolytic solution are housed in the exterior body 12.

[0031] The exterior body 12 has a cell side surface 13, a cell side surface 14, and a cell top surface 15. Each of the cell side surface 13 and the cell side surface 14 is formed of a plane orthogonal to the Y-axis direction. The cell side surface 13 and the cell side surface 14 face opposite sides in the Y-axis direction. Each of the cell side surface 13 and the cell side surface 14 has the largest area among the plurality of side surfaces of the exterior body 12. The cell top surface 15 is formed of a plane orthogonal to the Z-axis direction. The cell top surface 15 faces the +Z-axis direction.

[0032] The battery cell 11 further has a gas discharge valve 17. The gas discharge valve 17 is provided on the cell top surface 15. The gas discharge valve 17 is provided at the central portion of the cell top surface 15 in the X-axis direction. When the internal pressure of the exterior body 12 becomes a predetermined value or more due to the gas generated inside the exterior body 12, the gas discharge valve 17 discharges the gas to the outside of the exterior body 12. The gas from the gas discharge valve 17 flows through a duct 71, which will be described later, and is discharged to the outside of the battery module 1.

[0033] The battery cell 11 further has electrode terminals 16 in which a positive electrode terminal 16P and a negative electrode terminal 16N are paired. The electrode terminals 16 are provided on the cell top surface 15. The positive electrode terminal 16P and the negative electrode terminal 16N are respectively provided on both sides of the gas discharge valve 17 in the X-axis direction with the gas discharge valve 17 interposed therebetween.

[0034] The case body 31 has a rectangular parallelepiped appearance. The case body 31 is made of resin. In each battery cell unit 21, the case body 31 houses a plurality of battery cells 11. The case body 31 has a case top 32. The case top 32 has a wall shape in which the Z-axis direction is the thickness direction and is arranged parallel to the X-axis - Y-axis plane.

[0035] As shown in FIGS. 3 and 4, a plurality of battery cells 11 are stacked in the Y-axis direction across between battery cell units 21A to 21F arranged in the Y-axis direction (the first direction). Between the battery cells 11 adjacent to each other in the Y-axis direction, the cell side surfaces 13 face each other, and the cell side surfaces 14 face each other so as to be stacked. Thereby, in the Y-axis direction in which the plurality of battery cells 11 are stacked, the positive electrode terminals 16P and the negative electrode terminals 16N are arranged alternately. The positive electrode terminal 16P and the negative electrode terminal 16N adjacent to each other in the Y-axis direction are connected to each other by a bus bar (not shown). Thereby, the plurality of battery cells 11 are electrically connected in series to each other.

[0036] As shown in FIGS. 1 to 3, the battery module 1 further includes a pair of end plates 42 (42P, 42Q) and a pair of binding bars 43 (constraint members). The pair of binding bars 43 and the pair of end plates 42 integrally hold a plurality of battery cell units 21 (a plurality of battery cells 11) arranged in the Y-axis direction.

[0037] The pair of end plates 42 are respectively disposed at both ends of the plurality of battery cells 11 (a plurality of battery cell units 21) in the Y-axis direction. The end plate 42P faces the battery cell unit 21A in the Y-axis direction, and the end plate 42Q faces the battery cell unit 21F in the Y-axis direction.

[0038] The pair of binding bars 43 are disposed at both ends of the stack of battery cells 11 in the X-axis direction (the second direction). That is, the pair of binding bars 43 are provided so as to be arranged in the X-axis direction with respect to the plurality of battery cell units 21 and the end plates 42. The binding bar 43 extends in the Y-axis direction. The end of the binding bar 43 in the -Y axis direction is connected to the end plate 42P by a bolt 44. The end of the binding bar 43 in the +Y axis direction is connected to the end plate 42Q by a bolt 44. The pair of binding bars 43, together with the pair of end plates 42, apply a restraining force in the Y-axis direction to the plurality of battery cells 11 (a plurality of battery cell units 21). In addition, a retainer that extends in the X-axis direction while intersecting the duct 71 described later and is connected to the pair of binding bars 43 at both ends thereof may be further provided.

[0039] A stud bolt 45 is attached to the end plate 42. The battery module 1 is fixed to a support mechanism (such as a pack case) via the stud bolt 45. The battery module 1 further includes a duct 71 and a cover body 51.

[0040] The duct 71 is made of a resin such as polybutylene terephthalate resin (PBT resin). The duct 71 extends in the Y-axis direction while facing a plurality of battery cells 11 (a plurality of battery cell units 21) in the Z-axis direction (the third direction). The duct 71 is an elongated body extending in the Y-axis direction. The duct 71 forms a passage through which the gas discharged from the plurality of battery cells 11 flows. The duct 71 is attached to the member 30 to be attached. The member 30 to be attached is a member held by the battery cell 11, and in the present embodiment, it is composed of a plurality of case bodies 31 arranged in the Y-axis direction.

[0041] The cover body 51 is made of resin. The cover body 51 is provided so as to cover the plurality of battery cells 11 in the Z-axis direction. The cover body 51 is provided to face the case top 32 of the case body 31 in the Z-axis direction. The cover body 51 is provided so as to further cover the duct 71.

[0042] The bottom cover body 81 (cover member) shown in FIG. 2 is an insulating member made of an insulating resin. The bottom cover body 81 is provided so as to cover the plurality of battery cells 11 in the Z-axis direction. The bottom cover body 81 is provided to face the bottom of the case body 31 (the side opposite to the case top 32) in the Z-axis direction. By providing the insulating bottom cover body 81, the insulation on the bottom side of the battery module 1 can be improved.

[0043] FIG. 6 is a perspective view showing the bottom cover body 81. FIG. 7 is a top view showing the bottom cover body 81. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7.

[0044] As shown in FIGS. 6 to 8, the bottom cover body 81 (cover member) has a bottom surface 81A and a wall surface portion 81B. The wall surface portion 81B is provided so as to rise substantially vertically from the outer peripheral portion of the bottom surface 81A with respect to the bottom surface 81A. The bottom surface 81A and the wall surface portion 81B are typically formed by integrally molding the resin.

[0045] The bottom cover body 81 includes a through hole 100 provided at the center in the X-axis direction, leaf springs 200 and through holes 300 provided on both sides in the X-axis direction with respect to the through hole 100, protrusions 400 provided at both ends in the X-axis direction, and groove portions 500 provided at the four corner portions.

[0046] The through holes 100 and 300 are provided in a central region 600 on the central side in the X-axis direction (second direction) of the bottom cover body 81. The through holes 100 and 300 constitute a "first drainage part" located at the center in the X-axis direction of the bottom cover body 81. The groove portions 500 are provided in an end region 700 in the X-axis direction (second direction) of the bottom cover body 81. The groove portions 500 constitute a "second drainage part" located at both ends (four corners) in the X-axis direction and Y-axis direction of the bottom cover body 81. Moisture such as condensed water accumulated on the bottom surface 81A of the bottom cover body 81 is discharged from above the bottom cover body 81 through the through holes 100 and 300 and the groove portions 500.

[0047] In the region 600, the bottom surface 81A of the bottom cover body 81 has an inclined surface that inclines downward (-Z-axis direction) toward the through hole 100 located at the center in the X-axis direction. Therefore, when the battery module 1 is installed horizontally as a whole, the moisture accumulated on the region 600 easily flows toward the through hole 100, and the discharge of moisture is promoted. Note that the formation of the above-described inclined surface is not an essential configuration in the present technology.

[0048] In one example, the through hole 100 is a round hole with a diameter of about 7 mm, the through hole 300 is a rectangular hole of about 6 mm (Y-axis direction) × 8 mm (X-axis direction), and the width (X-axis direction) of the groove portion 500 is about 10 mm. However, the shapes and dimensions of the through holes 100 and 300 and the groove portion 500 are not limited to the above, and can be changed as appropriate.

[0049] The protrusion 400 provided in the region 700 has, as an example, a substantially circular cross-sectional shape. However, the protrusion 400 may have a cross-sectional shape different from the substantially circular shape, such as a substantially polygonal shape. By making the protrusion 400 have a substantially circular cross-sectional shape, the resistance to the flow of moisture such as condensed water discharged from the region 700 through the groove portion 500 can be reduced.

[0050] In the present embodiment, as an example, six sets of leaf springs 200 and twelve sets of protrusions 400 are provided in the Y-axis direction with respect to the six battery cell units 21. The number and arrangement of the leaf springs 200 and the protrusions 400 can be appropriately changed.

[0051] The size of the protrusion 400 can also be appropriately changed. As an example, the diameter (for example, about 4 mm) and shape (circular) of the top surface 400A can be set so that the case body 31 of the battery cell unit 21 does not plastically deform even when a predetermined load (for example, 120 N) acts.

[0052] The leaf spring 200 (biasing portion) biases the laminate in the direction away from the bottom cover body 81 (+Z-axis direction). The leaf spring 200 may be formed integrally with the bottom surface 81A and the wall surface portion 81B of the bottom cover body 81, or a separately formed member may be attached. The leaf spring 200 is provided at a position overlapping the through hole 300 in the Z-axis direction. The leaf spring 200 is formed so as to rise upward from the edge of the through hole 300. The leaf spring 200 and the through hole 300 are provided symmetrically with respect to the center of the bottom cover body 81 in the X-axis direction.

[0053] A plurality of through holes 100 and 300 are formed so as to be arranged along the Y-axis direction. The through hole 100 and the through hole 300 are formed at positions shifted from each other in the Y-axis direction. That is, the through holes 100 and 300 are arranged in a staggered manner.

[0054] The specifications of the bottom cover body 81 can be changed as appropriate. In one example, for instance, when a predetermined test finger is pushed into the through hole 100 in a method compliant with JISC 0920, the material (hardness) of the bottom cover body 81, the thickness of the bottom surface 81A, the diameter of the through hole 100, etc. are set so that the test finger does not touch the battery cell 11.

[0055] FIG. 9 is an enlarged perspective view showing the periphery of the through holes 100 and 300 in the bottom cover body 81. FIGS. 10 and 11 are cross-sectional views taken along X-X and XI-XI in FIG. 7, respectively. FIG. 12 is an enlarged perspective view of the groove portion 500.

[0056] As shown in FIGS. 9 and 10, flange portions 110 and 310 that protrude downward (opposite side of the battery cell 11) are respectively formed at the edges of the through holes 100 and 300. As shown in FIG. 11, also in the groove portion 500, a flange portion 510 that protrudes downward of the groove portion 500 is formed. By forming the flange portions 110, 310, and 510, it is possible to promote drainage (suppression of adhesion in the drainage portion) when moisture is discharged from the through holes 100 and 300 and the groove portion 500.

[0057] When the battery module 1 is used in a vehicle, a ship, etc., the battery module 1 may tilt due to the external environment. When the battery module 1 tilts, as shown in FIG. 13, the moisture 800 is drawn toward the end portion of the bottom cover body 81 in the X-axis direction. The moisture 800 drawn toward the end portion flows in the Y-axis direction along the wall surface portion 81B and is discharged from above the bottom cover body 81 through the groove portion 500 provided at the end portion in the Y-axis direction.

[0058] Thus, in the battery module 1 according to the present embodiment, even when the battery module 1 tilts due to the external environment, drainage of condensed water, etc. can be performed smoothly.

[0059] FIG. 14 is a view showing a state where the battery module 1 is biased upward. FIG. 15 is a view showing a state where the battery module 1 has moved downward.

[0060] As shown in FIG. 14, the leaf spring 200 biases the battery cell unit 21 including a plurality of battery cells 11 upward. The battery cell unit 21 biased by the leaf spring 200 is pressed against the binding bar 43. More specifically, the binding bar 43 has an opposing surface 43A (opposing portion) facing the case top 32 of the case body 31, and the battery cell unit 21 is biased by the leaf spring 200 such that the case top 32 of the case body 31 abuts against the opposing surface 43A of the binding bar 43. Here, the opposing surface 43A of the binding bar 43 serves as a reference surface for positioning the plurality of battery cell units 21 in the Z-axis direction.

[0061] Thus, in the battery module 1, the leaf spring 200 and the binding bar 43 can accurately position the plurality of battery cell units 21 in the Z-axis direction. In particular, in the step of stacking the plurality of battery cell units 21 and restraining them in the Y-axis direction, a simple and highly accurate positioning method can be provided.

[0062] As described above, the bottom cover body 81 includes protrusions 400 protruding toward the battery cell unit 21. The protruding heights of the plurality of protrusions 400 are substantially constant. Among the plurality of protrusions 400, the heights of some of the protrusions 400 may be different.

[0063] When the battery module 1 vibrates due to the external environment and the battery cell unit 21 moves downward (in the direction approaching the bottom cover body 81) against the biasing force of the leaf spring 200, as shown in FIG. 15, the top surface 400A of the protrusion 400 abuts against the stacked body of the battery cell unit 21 to support the stacked body of the battery cell unit 21 and prevent the battery cell unit 21 from approaching the bottom cover body 81 too much. After the external force due to vibration stops acting, the battery cell unit 21 is pressed against the opposing surface 43A of the binding bar 43 by the biasing force of the leaf spring 200 and returns to the state shown in FIG. 14. Thus, even when the battery module 1 vibrates, the positioning of the battery cells can be accurately performed.

[0064] Thus, in the battery module 1 according to this embodiment, even when the battery module 1 is tilted, drainage of condensed water or the like accumulated on the bottom cover body 81 can be performed smoothly, and even when the battery module 1 vibrates, positioning of the stacked body of the plurality of battery cell units 21 can be performed with high accuracy.

[0065] Furthermore, in the battery module 1, the battery cell units 21 are configured by arranging a plurality of battery cells 11 in the Y-axis direction and accommodating them in the case body 31, and the battery module 1 is configured by arranging the plurality of battery cell units 21 in the Y-axis direction. By doing so, the manufacturing process can be simplified as compared with the case of manufacturing the battery module 1 with each of the plurality of battery cells 11 as one unit.

[0066] In the battery module 1, by configuring the battery cell unit 21 that houses the plurality of battery cells 11 in the case body 31, the battery module 1 can be easily disassembled or replaced in units of the battery cell unit 21.

[0067] In the battery module 1, by configuring the battery cell unit 21 that houses the plurality of battery cells 11 in the case body 31, when the battery module 1 is discarded, the battery module 1 can be divided and the battery cell unit 21 can be used as one unit to reduce the voltage and handle it. Therefore, the disposal of the battery module 1 can be facilitated.

[0068] In the battery module 1, each unit includes two or more battery cells 11, and by setting the output density of each of the two or more battery cells 11 to about 8000 W / L or more, a power supply device with a predetermined voltage or higher can be formed in unit units.

[0069] As described above, the embodiments of the present technology have been described. However, it should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present technology is indicated by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Description of Signs

[0070] 1 Battery module, 11 Battery cell, 12 Exterior body, 13, 14 Cell side surface, 15 Cell top surface, 16 Electrode terminal, 16N Negative electrode terminal, 16P Positive electrode terminal, 17 Gas discharge valve, 21, 21A, 21B, 21C, 21D, 21E, 21F Battery cell unit, 30 Member to be attached, 31 Case body, 32 Case top, 42, 42P, 42Q End plate, 43 Binding bar, 43A Opposing surface, 44 Bolt, 45 Stud bolt, 51 Cover body, 71 Duct, 81 Bottom cover body, 81A Bottom surface, 81B Wall portion, 100 Through hole, 110 Flange portion, 200 Leaf spring, 300 Through hole, 310 Flange portion, 400 Protrusion, 400A Top surface, 500 Groove portion, 510 Flange portion, 600, 700 Region, 800 Moisture.

Claims

1. A laminate including a plurality of battery cells each having a rectangular housing arranged side by side in a first direction and electrode terminals provided on the housing, A restraining member provided so as to be arranged side by side in a second direction orthogonal to the first direction with respect to the plurality of battery cells, and restraining the laminate along the first direction, An insulating cover member provided so as to cover the laminate from the opposite side of the electrode terminals in a third direction orthogonal to the first direction and the second direction, The cover member includes a first drainage portion located at a central portion of the cover member in the second direction and second drainage portions located at both end portions of the cover member in the second direction, At least one of the first drainage portion and the second drainage portions includes a through hole provided in the cover member, A battery module further including a biasing portion provided at an edge of the through hole and biasing the laminate in a direction away from the cover member.

2. The battery module according to claim 1, wherein a flange portion protruding to the opposite side of the laminate is formed at an edge of the through hole.

3. A laminate including a plurality of battery cells each having a rectangular housing arranged side by side in a first direction and electrode terminals provided on the housing, A restraining member provided so as to be arranged side by side in a second direction orthogonal to the first direction with respect to the plurality of battery cells, and restraining the laminate along the first direction, An insulating cover member provided so as to cover the laminate from the opposite side of the electrode terminals in a third direction orthogonal to the first direction and the second direction, The cover member includes a first drainage portion located at a central portion of the cover member in the second direction and second drainage portions located at both end portions of the cover member in the second direction, A battery module, wherein at least one of the first drainage portion and the second drainage portions includes a groove portion provided at an end portion of the cover member in the first direction.

4. The battery module according to any one of claims 1 to 3, wherein the cover member has an inclined surface that inclines in a direction away from the laminate toward the first drainage portion located at the central portion in the second direction.

5. The battery module according to any one of claims 1 to 3, wherein the laminate further includes a case that houses the plurality of battery cells and supports them at least in the first direction, and forms a unit including the plurality of battery cells.

6. The battery module according to claim 5, wherein the unit includes two or more battery cells, and the output density of each of the two or more battery cells is 8000 W / L or more.

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