Battery pack and electric device

Abstract

The present application provides a battery pack and an electric device. The battery pack has a first direction and a second direction which intersect with each other, and comprises at least two battery columns and at least one cooling plate; the at least two battery columns are spaced apart from each other in the first direction; in the first direction, there is a first gap between two adjacent battery columns, and the cooling plate is provided in the first gap; the battery columns each comprise a plurality of battery cells; the plurality of battery cells are distributed in the second direction; a plurality of cooling portions are provided on the cooling plate; the plurality of cooling portions are distributed at intervals in the second direction; the cooling portions are recessed in the direction facing away from the battery cells in contact with the cooling portions; the cooling portions each have an inwardly-concave surface; and at least part of each inwardly-concave surface is connected to the corresponding battery cell. The present application can achieve both the cooling effect and the service life of a battery.

Description

Battery packs and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 26, 2023, with application number 202323583649.4 and application name “Battery Pack and Electrical Equipment,” all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0003] Today, battery packs are increasingly used in a wide range of applications, not only in energy storage systems such as hydropower, thermal, wind, and solar power stations, but also in a wide range of applications such as electric vehicles and aerospace. As the application areas of battery packs continue to expand, their market demand is also growing.

[0004] In the related art, to prevent the heat generated by the battery cells from affecting their performance and service life, battery packs are typically equipped with cooling plates to cool the battery cells. When the battery cells generate heat, the plates exchange heat with the cells to cool the battery pack. However, in the related art, the cooling plates cannot adapt to the expansion of the battery cells during the charge and discharge cycles of the battery pack, failing to provide sufficient expansion space for the cells. Furthermore, the cooling effect on the expanded cells is poor.

[0005] Application Contents

[0006] The embodiments of the present application provide a battery pack and electrical equipment to solve the problems in the related art that the cooling plate cannot adapt to the expansion of the battery cells, cannot provide sufficient expansion space for the battery cells, and has poor cooling effect on the battery cells after the battery cells expand.

[0007] In order to solve the above technical problems, this application is implemented as follows:

[0008] In a first aspect, embodiments of the present application provide a battery pack having a first direction and a second direction intersecting each other, the battery pack comprising at least two battery columns and at least one cooling plate, the at least two battery columns being spaced apart along the first direction, a first gap being defined between two adjacent battery columns along the first direction, and the cooling plate being disposed in the first gap;

[0009] The battery column includes a plurality of battery cells, and the plurality of battery cells are distributed along the second direction. The cooling plate is provided with a plurality of cooling parts, and the plurality of cooling parts are distributed at intervals along the second direction. The cooling parts have an inner concave surface, which is connected to the battery cells and accommodates part of the battery cells.

[0010] Optionally, in the first direction, the cooling plate has a first side plate and a second side plate relative to each other, and the first side plate and / or the second side plate are provided with the cooling part; at least one of the two adjacent side surfaces of the first side plate and the second side plate extends concavely toward the other.

[0011] Optionally, the cooling plate has an accommodating cavity inside, a support member is provided in the accommodating cavity, the support member is connected to the first side plate, and along the first direction on a plane perpendicular to the first direction, the projection of the support member falls within the projection of the cooling part.

[0012] Optionally, the cooling plate has an accommodating cavity inside, a support member is provided in the accommodating cavity, the support member is connected to the second side plate, and along the first direction on a plane perpendicular to the first direction, the projection of the support member falls within the projection of the cooling part.

[0013] Optionally, the cooling plate has an accommodating cavity inside, a support member is provided in the accommodating cavity, the support member is connected to the first side plate and the second side plate, and along the first direction on a plane perpendicular to the first direction, the projection of the support member falls within the projection of the cooling part.

[0014] Optionally, the support member includes a first support member and a second support member, in the first direction, the first support member has a first end and a second end opposite to each other, and the second support member has a third end and a fourth end opposite to each other;

[0015] The first end of the first support member is connected to the first side panel, the second end of the first support member is spaced apart from the second side panel in the first direction, the third end of the second support member is connected to the second side panel, the fourth end of the second support member is spaced apart from the first side panel in the first direction, and the first support member and the second support member are staggered along the second direction.

[0016] Optionally, in the first direction, the battery cell has a relative first wall and a second wall, the first wall is connected to the second side plate, the second pen is connected to the first side plate, the stiffness of the first wall is K1, the stiffness of the second wall is K2, the stiffness of the first side plate is K3, and the stiffness of the second side plate is K4, K1, K2, K3, K4, satisfying: K1>K4.

[0017] Optionally, in the first direction, the battery cell has a relative first wall and a second wall, the first wall is connected to the second side plate, the second pen is connected to the first side plate, the stiffness of the first wall is K1, the stiffness of the second wall is K2, the stiffness of the first side plate is K3, and the stiffness of the second side plate is K4, K1, K2, K3, K4, satisfying K2>K3.

[0018] Optionally, in the first direction, the battery cell has a relative first wall and a second wall, the first wall is connected to the second side plate, the second pen is connected to the first side plate, the stiffness of the first wall is K1, the stiffness of the second wall is K2, the stiffness of the first side plate is K3, and the stiffness of the second side plate is K4, K1, K2, K3, K4, satisfying: K1>K4, and, K2>K3.

[0019] Optionally, in the second direction, there is a connecting portion between two adjacent cooling parts, the connecting portion is connected to both adjacent cooling parts, and the connecting portion and the cooling parts have an arc transition; the connecting portion is connected to two adjacent single batteries along the second direction.

[0020] Optionally, at least part of the connecting portion protrudes from the surface of the cooling plate in a direction toward the battery cell adjacent to the cooling portion;

[0021] In the second direction, a second gap is defined between two adjacent battery cells, and at least a portion of the connecting portion is located in the second gap.

[0022] Optionally, there are multiple connecting parts, and the multiple connecting parts are alternately connected to the multiple cooling parts along the second direction, and the thickness of the cooling part between two adjacent connecting parts along the second direction is greater at both ends than the thickness in the middle.

[0023] Optionally, the cooling plate has an accommodating cavity inside, the connecting portion has a first surface located inside the accommodating cavity, the cooling portion has a second surface located inside the accommodating cavity, and the first surface is recessed into the second surface along a direction from the inside of the accommodating cavity to the outside of the accommodating cavity.

[0024] Optionally, the battery cell has a first side surface, a second side surface and a contact surface facing the cooling part, the first side surface has a first edge facing the contact surface, the second side surface has a second edge facing the contact surface, the contact surface is connected to the first edge and the second edge to connect the first side surface and the second side surface, the contact surface protrudes relative to the first edge and the second edge in the direction toward the cooling part, the contact surface is opposite to the cooling part along the first direction, and is connected to the concave surface.

[0025] Optionally, the battery pack further includes a connecting structure connected between the battery cell and the cooling plate.

[0026] Optionally, the connection structure is an adhesive, and the adhesive has at least one of elasticity, insulation performance, and thermal conductivity.

[0027] Optionally, the largest surface of the battery cell is connected to the concave surface.

[0028] Optionally, along the first direction and on a plane perpendicular to the first direction, the projection of the inner concave surface covers at least one battery cell in the second direction.

[0029] Optionally, along the first direction, the minimum dimension of the battery cell is H mm, the maximum dimension of the inner concave surface is L mm, and the following condition is satisfied: 0.005≤L / H≤0.050.

[0030] Optionally, the battery pack satisfies: 0.010<L / H≤0.035.

[0031] Optionally, the battery pack satisfies: 0.5≤L≤5.

[0032] Optionally, the battery pack satisfies: 10≤H≤60.

[0033] Optionally, the battery pack satisfies: 0.5≤L≤5, and 10≤H≤60.

[0034] In a second aspect, an embodiment of the present application provides an electric device, which includes a battery pack as described in any one of the first aspects above.

[0035] In an embodiment of the present application, the battery pack includes at least two battery columns and at least one cooling plate. The at least two battery columns are spaced apart along a first direction, and there is a first gap between two adjacent battery columns along the first direction. Since the cooling plate is arranged in the first gap, the cooling plate can exchange heat with the battery columns on both sides thereof, thereby cooling the battery columns. The battery column includes a plurality of battery cells distributed along a second direction, and a plurality of cooling parts spaced apart along the second direction are provided on the cooling plate. Since the cooling parts are recessed in a direction away from the battery cells in contact with the cooling parts, and at least a portion of the inner concave surface of the cooling parts is connected to the battery cells, a gap can be provided between the position where the cooling parts are provided on the cooling plate and the battery cells. On the one hand, a certain space can be reserved for the expansion of the battery cells, thereby avoiding the problem that the battery cells or the cooling plate are damaged due to the force exerted on the cooling plate by the battery cells after expansion. On the other hand, the cooling parts are recessed in a direction away from the adjacent battery cells, and the inner concave surface thereof adapts to the expansion of the battery cells after operation. After the battery cells expand, the inner concave surface can accommodate the expanded parts of the battery cells. The connection effect between the expanded parts and the inner concave surface is better, and the contact area when the expanded parts are connected to the flat surface is large, so that the cooling effect on the battery cells after the battery cells expand is also better. In addition, due to the presence of the inner concave surface, the force exerted by the cooling plate on the battery cells in the initial use can be effectively reduced, thereby improving the service life of the battery cells and the battery pack. That is, the cooling plate provided in the embodiment of the present application can adapt to the expansion of the battery cell during operation, can provide sufficient expansion space for the battery cell, and can maintain good contact with the battery cell after the battery cell expands, so that the cooling plate has a better cooling effect on the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 shows an exploded view of a battery pack provided in an embodiment of the present application;

[0037] FIG2 is a schematic diagram showing the connection between a battery array and a cooling plate provided in an embodiment of the present application;

[0038] FIG3 shows a cross-sectional view of a battery array and a cooling plate provided in an embodiment of the present application;

[0039] FIG4 shows an exploded view of FIG3 ;

[0040] FIG5 shows a top view of a cooling plate provided in an embodiment of the present application;

[0041] FIG6 shows a partial enlarged view of point I in FIG5 ;

[0042] FIG7 is a partial schematic diagram of a cooling plate provided in an embodiment of the present application;

[0043] FIG8 is a schematic diagram of a cooling plate provided in an embodiment of the present application;

[0044] FIG9 is a partial schematic diagram showing the connection between a cooling plate and a battery cell provided by an embodiment of the present application.

[0045] Reference numerals: 100: battery pack; 10: battery array; 20: cooling plate; 200: first side wall; 30: first gap; 11: battery cell; 21: cooling portion; 211: inner concave surface; 22: first side plate; 23: second side plate; 24: accommodating cavity; 222: first surface; 232: second surface; 40: support member; 41: first support member; 42: second support member; 411: first end; 412: second end; 421: third end; 422: fourth end; 111: first wall; 112: second wall; 113: First side surface; 114: Second side surface; 115: Contact surface; 1131: First edge; 1141: Second edge; 116: Reference plane; 12: Second gap; 223: Connecting portion; 50: Connecting structure; 101: Upper cover; 102: Box body; 103: Current collector; 2231: Connecting portion; 261: First surface; 2111: Second surface; 201: First recessed portion; 202: Second recessed portion; 203: First inner concave surface; 204: Second inner concave surface; X: First direction; Y: Second direction. Specific embodiments

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0048] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. At the same time, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0049] As shown in Figures 1 to 9, this embodiment provides a battery pack 100. The battery pack 100 has a first direction X and a second direction Y intersecting each other. The battery pack 100 includes at least two battery columns 10 and at least one cooling plate 20. The at least two battery columns 10 are spaced apart along the first direction X. A first gap 30 is defined between two adjacent battery columns 10 along the first direction X, and the cooling plate 20 is disposed in the first gap 30. The battery columns 10 include a plurality of battery cells 11, which are spaced apart along the second direction Y. The cooling plate 20 is provided with a plurality of cooling portions 21, which are spaced apart along the second direction Y. The cooling portions 21 have inner concave surfaces 211, which are connected to the battery cells 11 and partially accommodate the battery cells 11.

[0050] In some embodiments, one cooling portion 21 may be correspondingly provided with one inner concave surface 211 , and a plurality of inner concave surfaces 211 may be arranged at intervals along the second direction Y.

[0051] In an embodiment of the present application, a battery pack 100 includes at least two battery columns 10 and at least one cooling plate 20. The at least two battery columns 10 are spaced apart along a first direction X, and a first gap 30 is provided between two adjacent battery columns 10 along the first direction X. Since the cooling plate 20 is disposed in the first gap 30, the cooling plate 20 can exchange heat with the battery columns 10 on both sides thereof, thereby cooling the battery columns 10. The battery columns 10 include a plurality of battery cells 11 distributed along a second direction Y. The cooling plate 20 is provided with a plurality of cooling portions 21 spaced apart along the second direction Y. Since the cooling portions 21 are recessed in a direction away from the battery cells 11 in contact with the cooling portions 21, and at least a portion of the inner concave surface 211 of the cooling portions 21 is connected to the battery cells 11, a gap can be provided between the position where the cooling portion 21 is provided on the cooling plate 20 and the battery cells 11. This can reserve a certain amount of space for the expansion of the battery cells 11, thereby preventing the battery cells 11 from expanding and moving inward. The force exerted by the cooling plate 20 causes a large interaction force between the battery cell 11 and the cooling plate 20, resulting in damage to one of them. On the other hand, the cooling portion 21 is recessed in a direction away from the battery cell 11 connected to the cooling portion 21, and its inner concave surface 211 adapts to the expansion of the battery cell 11 after operation. After the battery cell 11 expands, the expanded portion connects better with the inner concave surface 211, and the contact surface 115 when the expanded portion connects with the flat surface is larger, thereby achieving a better cooling effect on the battery cell 11 after the battery cell 11 expands. In other words, the cooling plate 20 provided in the embodiment of the present application can adapt to the expansion of the battery cell 11 during operation, provide sufficient expansion space for the battery cell 11, and maintain good contact with the battery cell 11 after the battery cell 11 expands, so that the cooling plate 20 has a better cooling effect on the battery cell 11.

[0052] It should be noted that the battery pack 100 has intersecting first and second directions X and Y. The first direction X represents the distribution direction of the multiple battery columns 10, and the second direction Y represents the distribution direction of the multiple battery cells 11 within a battery column 10. The first and second directions X and Y may be angled with each other. Specifically, the angle may be 90°, meaning that the first and second directions X and Y are perpendicular to each other. In this case, the multiple battery cells 11 can be arranged in a regular pattern, facilitating the placement of the cooling plate 20. The battery pack 100 may also include a housing 102. The multiple battery cells 11 are disposed within the housing 102 and contact the bottom plate of the housing 102, which supports the multiple battery cells 11. As shown in FIG1 , the first and second directions X and Y may both be parallel to the bottom plate. The housing 102 may also include a top cover 101, which opposes the bottom plate and seals the housing 102.

[0053] It should also be noted that the battery cells 11 in the battery array 10 are spaced apart along the second direction Y, and the cooling portions 21 in the cooling plate 20 are also spaced apart along the second direction Y. The cooling portions 21 may be opposite the battery cells 11, i.e., one cooling portion 21 may correspond to one battery cell 11. Thus, the arrangement of the battery cells 11 corresponds to the arrangement of the cooling portions 21, and the cooling portions 21 correspond one to one with the battery cells. Thus, one cooling portion 21 may cool one battery cell 11. This is shown in Figures 4 and 8.

[0054] In addition, there are at least two battery columns 10. Specifically, the number of battery columns 10 can be 2, 3, 4, 5, 6, etc. Each battery column 10 contains multiple battery cells 11. The number of battery cells 11 can be 2, 3, 4, 5, 6, 7, etc. The embodiment of the present application does not specifically limit the number of battery columns 10 or the number of battery cells 11 in each battery column 10. These numbers can be set based on the specifications and capacity of the battery pack 100, and the electrical equipment in which the battery pack 100 is used. The number of battery cells 11 in each battery column 10 can be the same or different, and this embodiment of the present application does not specifically limit this.

[0055] In some embodiments, along the first direction X, on a plane perpendicular to the first direction X, the projection of the inner concave surface 211 covers at least one battery cell 11 in the second direction Y. Specifically, one battery cell 11 corresponds to one inner concave surface 211, and the projection of the inner concave surface 211 covers one battery cell 11 in the second direction Y. It can be understood that, in the second direction Y, the size of the inner concave surface 211 is greater than or equal to the size of the battery cell 11. Thus, in the second direction Y, each of the multiple battery cells 11 has a corresponding cooling portion 20 to absorb expansion, preventing uneven absorption of expansion between the individual battery cells 11 and ensuring consistent lifespan across the multiple battery cells 11.

[0056] In addition, in some embodiments, as shown in FIG. 2 and FIG. 4 , in the first direction X, the cooling plate 20 has a first side plate 22 and a second side plate 23 opposite to each other, and the first side plate 22 is provided with a cooling portion 21 .

[0057] In some embodiments, in the first direction X, the cooling plate 20 has a first side plate 22 and a second side plate 23 opposite to each other, and the second side plate 23 is provided with a cooling portion 21 .

[0058] In some embodiments, in the first direction X, the cooling plate 20 has a first side plate 22 and a second side plate 23 opposite to each other, and both the first side plate 22 and the second side plate 23 are provided with a cooling portion 21 .

[0059] It is understood that a receiving cavity 24 for accommodating a dielectric fluid is formed between the first side plate 22 and the second side plate 23. The cooling portion 21 may be provided on the first side plate 22, the second side plate 23, or both the first side plate 22 and the second side plate. Therefore, it is understood that the cooling plate 20 has a first side wall 200, which faces and is connected to the battery cell 11. The first side wall 200 may be formed by both the first side plate 22 and the second side plate 23.

[0060] In some embodiments, the side surface of the first side plate 22 adjacent to the second side plate 23 protrudes and extends toward the second side plate 23, or the side surface of the second side plate 23 adjacent to the first side plate 22 protrudes and extends toward the first side plate 22, so that when the first side plate 22 and the second side plate 23 are subjected to force, the protruding extension of one of them first abuts against the other to avoid clogging of the accommodating cavity 24. Specifically, the first side plate 22 is a curved plate structure, one side of the curved plate forms an inner concave surface 211, and the other side is bent and concavely extended toward the second side plate 23. Alternatively, the second side plate 23 is a curved plate structure, and similarly, one side of the curved plate forms an inner concave surface 211, and the other side is bent and concavely extended toward the first side plate 22. This can make the thickness of the first side plate 22 or the second side plate 23 more uniform, thereby achieving a balanced heat exchange effect of the cooling plate 20. In addition, this can simplify the manufacturing process, as the above structure can be formed by directly applying pressure to the cooling plate 20.

[0061] In some embodiments, the adjacent side panels of the first side panel 22 and the second side panel 23 are arranged to be concave and extended. In this case, the first side panel 22 and the second side panel 23 are both arc-shaped panels.

[0062] In the first direction X, the cooling plate 20 has a first side plate 22 and a second side plate 23 that are opposed to each other. Since the first side plate 22 and the second side plate 23 are opposed to each other in the first direction X, and the battery columns 10 are also spaced apart along the first direction X, the first side plate 22 and the second side plate 23 are oriented toward different battery columns 10 in two adjacent battery columns 10, thereby enabling connection to the battery cells 11 in the two adjacent battery columns 10. The first side plate 22 forms a first side wall 200, allowing the cooling portion 21 to be disposed on the first side plate 22. The second side plate 23 forms a first side wall 200, allowing the cooling portion 21 to be disposed on the second side plate 23. The first side plate 22 and the second side plate 23 form a first side wall 200, allowing the cooling portion 21 to be disposed on the first side plate 22 and the second side plate 23.

[0063] When the cooling portion 21 is disposed on the first side plate 22, the cooling portion 21 can be connected to the battery cells 11 in the battery column 10 toward which the first side plate 22 faces, providing expansion space for these battery cells 11. Furthermore, after these battery cells 11 expand during operation, the cooling portion 21 can maintain good contact with these battery cells 11, thereby achieving a better cooling effect on these battery cells 11 on the cooling plate 20. When the cooling portion 21 is disposed on the second side plate 23, the cooling portion 21 can be connected to the battery cells 11 in the battery column 10 toward which the second side plate 23 faces, providing expansion space for these battery cells 11. Furthermore, after these battery cells 11 expand during operation, the cooling portion 21 can maintain good contact with these battery cells 11, thereby achieving a better cooling effect on these battery cells 11 on the cooling plate 20. When the cooling portion 21 is arranged on the first side plate 22 and the second side plate 23, the cooling portion 21 can be connected to the battery cells 11 in the two adjacent battery columns 10, providing expansion space for the battery cells 11 in the two battery columns 10, and making the cooling effect of the battery cells 11 in the two battery columns 10 of the cooling plate 20 better.

[0064] It should be noted that when the cooling part 21 is arranged on the first side plate 22 or the second side plate 23, the cooling part 21 can cool a column of battery columns 10, and can be arranged to be connected to the battery column 10 located at the edge, so that the battery column 10 located at the edge can also be connected to two cooling plates 20, so that the cooling effect of the cooling plate 20 on the battery column 10 located at the edge can also be better, and the problem of wasting part of the cooling part 21 on the cooling plate 20 that is only connected to the battery column 10 at the edge can be avoided.

[0065] In addition, in some embodiments, as shown in Figures 5, 6, and 7, the cooling plate 20 has an internal accommodating cavity 24, and a support member 40 can be disposed in the accommodating cavity 24. The support member 40 is connected to the first side plate 22 and / or the second side plate 23, and along the first direction X, on a plane perpendicular to the first direction X, the projection of the support member 40 falls within the projection of the cooling portion 21. The support member 40 can be connected to the first side plate 22, the second side plate 23, or both.

[0066] The cooling plate 20 has an internal accommodating cavity 24, in which a support member 40 is disposed. The support member 40 is connected to the first side plate 22, the second side plate 23, or both. Since the support member 40 faces the cooling portion 21, it supports the cooling portion 21. Specifically, as the battery cells 11 continue to operate, they expand more and more. As the battery cells 11 expand, the force exerted by the battery cells 11 on the first side plate 22 or the second side plate 23 increases, causing the cooling portion 21 to become more concave. The provision of the support member 40 prevents the battery cells 11 from excessively compressing the cooling plate 20, preventing the first side plate 22 and the second side plate 23 from abutting against each other under the force of the battery cells 11, which could cause the accommodating cavity 24 to become clogged. Furthermore, the provision of the support member 40 increases the strength of the cooling plate 20, preventing damage to the cooling plate 20 due to compression. In order to make the cooling plate 20 have a better cooling effect on the battery cell 11, a coolant is usually provided in the accommodating cavity 24. Blockage of the accommodating cavity 24 will cause the coolant in the cooling plate 20 to be unable to flow, resulting in a poor cooling effect of the cooling plate 20 on the battery cell 11.

[0067] It should be noted that a current collector 103 may also be provided on the cooling plate 20 . The current collectors 103 of multiple cooling plates 20 are interconnected, and coolant may be introduced into the accommodating cavity 24 through the current collector 103 , so that the cooling plate 20 has a better cooling effect on the battery cell 11 .

[0068] In addition, in some embodiments, as shown in Figure 7, the support member 40 may include a first support member 41 and a second support member 42. In the first direction X, the first support member 41 has a first end 411 and a second end 412 relative to each other, and the second support member 42 has a third end 421 and a fourth end 422 relative to each other; the first end 411 of the first support member 41 is connected to the first side plate 22, and the second end 412 of the first support member 41 is spaced apart from the second side plate 23 in the first direction X, the third end 421 of the second support member 42 is connected to the second side plate 23, and the fourth end 422 of the second support member 42 is spaced apart from the first side plate 22 in the first direction X, and the first support member 41 and the second support member 42 are arranged alternately along the second direction Y.

[0069] The support member 40 includes a first support member 41 and a second support member 42. In the first direction X, the first support member 41 has a first end 411 and a second end 412 opposite to each other. The first end 411 of the first support member 41 is connected to the first side plate 22, and the second end 412 of the first support member 41 is spaced apart from the second side plate 23 in the first direction X. That is, the first support member 41 is connected to the first side plate 22 and is spaced apart from the second side plate 23. The space between the first support member 41 and the second side plate 23 allows the cooling plate 20 to have a compression space. When the battery cell 11 expands, the battery cell 11 can compress the first side plate 22 or the second side plate 23, so that the distance between the cooling portion 21 on the first side plate 22 and the cooling portion 21 on the second side plate 23 is reduced. The first support member 41 and the second side plate 23 are also reduced. As the battery cell 11 continues to expand, the first support member 41 will abut against the second side plate 23. At this time, the spacing between the first support member 41 and the second side plate 23 is minimized, and the distance between the cooling portion 21 on the first side plate 22 and the cooling portion 21 on the second side plate 23 is also minimized. The battery can no longer continue to press the cooling plate 20, which can ensure the smooth flow of the accommodating cavity 24 and avoid the first side plate 22 and the second side plate 23 being fitted together under the action of the battery cell 11, resulting in the problem of blockage of the accommodating cavity 24.

[0070] In the first direction X, the second support member 42 has a third end 421 and a fourth end 422 opposite to each other. The third end 421 of the second support member 42 is connected to the second side plate 23, and the fourth end 422 of the second support member 42 is spaced apart from the first side plate 22 in the first direction X, that is, the second support member 42 is connected to the second side plate 23 and is spaced apart from the first side plate 22. The space between the second support member 42 and the first side plate 22 allows the cooling plate 20 to have a compression space. When the battery cell 11 expands, the battery cell 11 can compress the first side plate 22 or the second side plate 23, so that the distance between the cooling portion 21 on the first side plate 22 and the cooling portion 21 on the second side plate 23 is reduced. Small, at this time, the interval between the second support member 42 and the first side plate 22 is also reduced. As the battery cell 11 continues to expand, the second support member 42 will abut against the first side plate 22. At this time, the spacing between the second support member 42 and the first side plate 22 is minimized, and the distance between the cooling portion 21 on the first side plate 22 and the cooling portion 21 on the second side plate 23 is also minimized. The battery can no longer continue to press the cooling plate 20, which can ensure the smooth flow of the accommodating cavity 24 and avoid the first side plate 22 and the second side plate 23 being fitted together under the action of the battery cell 11, resulting in the problem of blockage of the accommodating cavity 24.

[0071] When the support member 40 is connected to the first side plate 22 and the second side plate 23, a first support member 41 is connected to the first side plate 22, and a second support member 42 is connected to the second side plate 23. Since the first support member 41 and the second support member 42 are staggered along the second direction Y, the first support member 41 and the second support member 42 are connected to different positions of the cooling portion 21. When the battery expands and squeezes the cooling plate 20, the first support member 41 moves toward the second side plate 23, and the second support member 42 moves toward the first side plate 22. The first support member 41 and the second support member 42 are staggered. Therefore, when the cooling plate 20 is squeezed to the extreme position, the first support member 41 can abut against the second side plate 23, and the second support member 42 can abut against the first side plate 22. This can avoid the problem of the first support member 41 and the second support member 42 abutting against each other during the expansion of the battery, thereby hindering the further compression of the cooling plate 20. This makes the deformation space of the cooling plate 20 larger and can adapt to a larger degree of expansion of the battery.

[0072] In which, the first side plate 22 has a first surface 222 facing the second side plate 23, and the second side plate 23 has a second surface 232 facing the first side plate 22. The first surface 222 and the second surface 232 can be the cavity walls of the accommodating cavity 24. The first end 411 of the first support member 41 can be connected to the partial surface of the first surface 222 opposite to the cooling part 21, the second end 412 of the first support member 41 can be spaced apart from the second surface 232 in the first direction X, the third end 421 of the second support member 42 can be connected to the partial surface of the second surface 232 opposite to the cooling part 21, the fourth end 422 of the second support member 42 can be spaced apart from the first surface 222 in the first direction X, and the first support member 41 and the second support member 42 are arranged alternately along the second direction Y.

[0073] In addition, in some embodiments, in the first direction X, the battery cell 11 may have a first wall 111 and a second wall 112 opposite to each other, the first wall 111 is connected to the second side plate 23, and the second wall 112 is connected to the first side plate 22. Specifically, the cooling portion 21 includes a first recessed portion 201 and a second recessed portion 202. The first recessed portion 201 and the second recessed portion 202 are both formed with an inner concave surface 211. More specifically, the first recessed portion 201 is provided on the first side plate 22, and the first recessed portion 201 has a battery cell contacting the first side plate 22. The first concave surface 203 of the battery cell 11 and the second concave portion 202 are provided on the second side plate 23. The second concave portion 202 has a second concave surface 204 facing the battery cell 11 in contact with the second side plate 23. At least a portion of the first concave surface 203 is connected to the second wall 112, and at least a portion of the second concave surface 204 is connected to the first wall 111. The stiffness of the first wall 111 is K1, the stiffness of the second wall 112 is K2, the stiffness of the first side plate 22 is K3, and the stiffness of the second side plate 23 is K4. K1, K2, K3, and K4 satisfy the following: K1>K4.

[0074] In some embodiments, in the first direction X, the battery cell 11 may have a first wall 111 and a second wall 112 opposite to each other, the first wall 111 is connected to the second side plate 23, and the second wall 112 is connected to the first side plate 22. Specifically, the cooling portion 21 includes a first recessed portion 201 and a second recessed portion 202. The first recessed portion 201 and the second recessed portion 202 are both formed with an inner concave surface 211. More specifically, the first recessed portion 201 is provided on the first side plate 22, and the first recessed portion 201 has a battery cell facing toward the first side plate 22. The first concave surface 203 of the battery cell 11 is formed on the second side plate 23, and the second concave portion 202 is provided on the second side plate 23. The second concave portion 202 has a second concave surface 204 facing the battery cell 11 in contact with the second side plate 23. At least a portion of the first concave surface 203 is connected to the second wall 112, and at least a portion of the second concave surface 204 is connected to the first wall 111. The stiffness of the first wall 111 is K1, the stiffness of the second wall 112 is K2, the stiffness of the first side plate 22 is K3, and the stiffness of the second side plate 23 is K4. K1, K2, K3, and K4 satisfy: K2>K3;

[0075] In some embodiments, in the first direction X, the battery cell 11 may have a first wall 111 and a second wall 112 opposite to each other, the first wall 111 is connected to the second side plate 23, and the second wall 112 is connected to the first side plate 22. Specifically, the cooling portion 21 includes a first recessed portion 201 and a second recessed portion 202. The first recessed portion 201 and the second recessed portion 202 are both formed with an inner concave surface 211. More specifically, the first recessed portion 201 is provided on the first side plate 22, and the first recessed portion 201 has a first recessed portion 211 facing the first side plate 22. An inner concave surface 203, a second concave portion 202 is arranged on the second side plate 23, the second concave portion 202 has a second inner concave surface 204 facing the battery cell 11 in contact with the second side plate 23, at least part of the first inner concave surface 203 is connected to the second wall 112, at least part of the second inner concave surface 204 is connected to the first wall 111, the stiffness of the first wall 111 is K1, the stiffness of the second wall 112 is K2, the stiffness of the first side plate 22 is K3, and the stiffness of the second side plate 23 is K4, K1, K2, K3, K4, satisfy: K1>K4, and, K2>K3.

[0076] The cooling portion 21 includes a first recessed portion 201 and a second recessed portion 202. The first recessed portion 201 is provided on the first side plate 22 and has a first inner concave surface 203 facing the battery cell 11 in contact with the first side plate 22. The second recessed portion 202 is provided on the second side plate 23 and has a second inner concave surface 204 facing the battery cell 11 in contact with the second side plate 23. In the first direction X, the battery cell 11 has a first wall 111 and a second wall 112 facing each other. At least a portion of the first inner concave surface 203 can be connected to the second wall 112, and at least a portion of the second inner concave surface 204 can be connected to the first wall 111, thereby connecting the first wall 111 to the second side plate 23 and the second wall 112 to the first side plate 22. The rigidity of the first wall 111 is K1, the rigidity of the second wall 112 is K2, the rigidity of the first side panel 22 is K3, and the rigidity of the second side panel 23 is K4. Since K1, K2, K3, and K4 satisfy: K1>K4, the rigidity of the first side panel 22 is smaller than that of the second wall 112. Since K1, K2, K3, and K4 satisfy: K2>K3, the rigidity of the second side panel 23 is smaller than that of the first wall 111. Since K1, K2, K3, and K4 satisfy: K1>K4, and K2>K3, that is, the stiffness of the first side plate 22 is less than the stiffness of the second wall 112, and the stiffness of the second side plate 23 is less than the stiffness of the first wall 111, when the battery cell 11 expands and deforms internally, the force applied by the first wall 111 to the second side plate 23 can deform the second recessed portion 202, and the force applied by the second wall 112 to the first side plate 22 can deform the first recessed portion 201, so that the cooling portion 21 can adapt to the expansion of the battery cell 11, so that the contact area between the cooling plate 20 and the battery cell 11 is larger, thereby ensuring the cooling effect of the cooling plate 20 on the battery cell 11.

[0077] It should be noted that the aforementioned first wall 111 and second wall 112 are the wall surfaces of different battery cells 11, specifically, the wall surfaces of two battery cells 11 in different battery columns 10. As shown in FIG4 , two battery columns 10 are provided on either side of a cooling plate 20. In this case, the battery cells 11 in one battery column 10 can be connected to the first side plate 22, and the battery cells 11 in the other battery column 10 can be connected to the second side plate 23. For a battery column 10 connected to the first side plate 22, the second wall 112 of the battery in the battery column 10 is connected to the cooling plate 20 via the first side plate 22, and the cooling plate 20 can cool the battery cells 11 via the first side plate 22. For a battery column 10 connected to the second side plate 23, the first wall 111 of the battery in the battery column 10 is connected to the cooling plate 20 via the first side plate 22, and the cooling plate 20 can cool the battery cells 11 via the second side plate 23. That is, when battery columns are provided on both sides of a cooling plate 20, the first side plate 22 can be connected to the second wall 112 of the battery cell 11 in one of the battery columns 10, and the second side plate 23 can be connected to the first wall 111 of the battery cell 11 in the other battery column 10.

[0078] In addition, in some embodiments, as shown in Figure 4, in the second direction Y, a connecting portion 223 may be provided between two adjacent cooling portions 21, and the connecting portion 223 is connected to both adjacent cooling portions 21, and the connecting portion 223 and the cooling portion 21 have an arc transition; the connecting portion 223 is connected to two adjacent battery cells 11 along the second direction Y.

[0079] In the second direction Y, there is a connecting portion 223 between two adjacent cooling portions 21, and the connecting portion 223 is connected to the two adjacent cooling portions 21. The connecting portion 223 is connected to the cooling portion 21 and the position where the two are connected forms a connecting portion 2231. The connecting portion 2231 is an arc structure. It can be understood that there is a connecting portion 223 between two adjacent cooling portions 21, and there is an arc transition between the cooling portion 21 and the connecting portion 223. This can avoid the problem of having a sharp angle between the position where the cooling portion 21 is set on the cooling plate 20 and the position where the cooling portion 21 is not set on the cooling plate 20, resulting in stress concentration at the cooling portion 21 and reduced strength of the cooling plate 20. This can avoid the problem of damage to the cooling plate 20 caused by the force applied to the cooling plate 20 when the battery cell 11 expands.

[0080] In addition, in some embodiments, as shown in Figures 3 and 4, at least a portion of the connecting portion 223 may protrude from the surface of the cooling plate 20 in a direction toward the battery cell 11 adjacent to the cooling portion 21; in the second direction Y, there is a second gap 12 between two adjacent battery cells 11, and at least a portion of the connecting portion 223 is located in the second gap 12 and connects the two adjacent battery cells 11.

[0081] A second gap 12 is defined between two adjacent battery cells 11, with at least a portion of the connection portion 223 located within the second gap 12. It is understood that the battery cells 11 are connected to the cooling portion 21, with the connection portion 223 located between the two adjacent battery cells 11. The connection portion 223 serves to position and secure the battery cells 11, facilitating their attachment to the cooling plate 20. Furthermore, the protrusion of the connection portion 223 from the cooling plate 20 allows for a certain amount of deformation in the cooling plate 20, thereby preventing damage to the cooling plate 20 due to deformation caused by stress.

[0082] It should be noted that at least part of the connecting portion 223 is located in the second gap 12, including the case where part of the connecting portion 223 is located in the second gap 12, and the case where the entire connecting portion 223 is located in the second gap 12. When part of the connecting portion 223 is located in the second gap 12, the edge of the battery cell 11 also abuts against the connecting portion 223. When the entire connecting portion 223 is located in the second gap 12, the battery cell 11 and the connection 2231 abut.

[0083] In some embodiments, there are multiple connecting portions 223, and the multiple connecting portions 223 are alternately connected to the multiple cooling portions 21 along the second direction Y. The thickness of the cooling portion 21 between two adjacent connecting portions 223 along the second direction Y is greater than the thickness of the middle portion. It is understood that the cooling portion 21 has a concave center and convex sides structure in the second direction Y. Since the battery cells 11 generally expand more in the middle, the middle portion of the cooling portion 21 is most concave, corresponding to the expansion position of the battery cells 11 in the middle, better absorbing the expansion of the battery cells 11, and thereby extending the battery life.

[0084] In addition, in some embodiments, as shown in Figure 6, the cooling plate 20 has a accommodating cavity 24 inside, the connecting portion 223 has a first surface 261 located inside the accommodating cavity 24, and the cooling portion 21 has a second surface 2111 located inside the accommodating cavity 24. The first surface 261 can be recessed in the second surface 2111 along the direction from the inside of the accommodating cavity 24 to the outside of the accommodating cavity 24.

[0085] The cooling plate 20 has an internal accommodating cavity 24. The connecting portion 223 has a first surface 261 located within the accommodating cavity 24. The cooling portion 21 has a second surface 2111 located within the accommodating cavity 24. Because the first surface 261 is recessed from the second surface 2111 along the direction from the interior of the accommodating cavity 24 to the exterior of the accommodating cavity 24, the size of the accommodating cavity 24 is larger at the connecting portion 223, allowing a larger portion of the cooling plate 20 to accommodate coolant. Furthermore, because the surface of the connecting portion 223 located outside the accommodating cavity 24 and the surface of the connecting portion 223 located inside the accommodating cavity 24 both protrude outward, the shapes of the two surfaces of the connecting portion 223 can be consistent, and the thickness of the connecting portion 223 can be consistent at all locations, which can also increase the strength of the connecting portion 223.

[0086] In addition, in some embodiments, as shown in Figure 9, the battery cell 11 has a first side surface 113, a second side surface 114 and a contact surface 115 facing the cooling portion 21, the first side surface 113 has a first edge 1131 facing the contact surface 115, the second side surface 114 has a second edge 1141 facing the contact surface 115, the contact surface 115 is connected to the first edge 1131 and the second edge 1141 to connect the first side surface 113 and the second side surface 114, the contact surface 115 can protrude relative to the first edge 1131 and the second edge 1141 in the direction toward the cooling portion 21, the contact surface 115 is opposite to the cooling portion 21 along the first direction X, and is connected to the inner concave surface 211. It should be noted that the virtual line between the first edge 1131 and the second edge 1141 can be understood as a virtual line connecting the same ends of the first edge 1131 and the second edge 1141 to form a quadrilateral structure, and the plane in which this quadrilateral structure is located is the reference plane 116, wherein the reference plane 116 should be understood as a rough plane.

[0087] It can be understood that the virtual line connecting the first edge 1131 and the second edge 1141 forms a reference plane 116 , and the contact surface 115 protrudes relative to the reference plane 116 .

[0088] The battery cell 11 has a first side surface 113, a second side surface 114, and a contact surface 115 facing the cooling portion 21. The first side surface 113 has a first edge 1131 facing the contact surface 115, and the second side surface 114 has a second edge 1141 facing the contact surface 115. The contact surface 115 can be connected to the first edge 1131 and the second edge 1141, thereby connecting the contact surface 115 with the first side surface 113 and the second side surface 114. In some embodiments, the first edge 1131 and the second edge 1141 are located in the same plane, and the plane containing the first edge 1131 and the second edge 1141 can be defined as a reference plane 116. The contact surface 115 is opposite the cooling portion 21 and is connected to the inner concave surface 211. Therefore, the contact surface 115 can apply force to the first sidewall 200, causing the degree of concavity of the cooling portion 21 to change to accommodate the expansion of the battery cell 11. The contact surface 115 protrudes relative to the first edge 1131 and the second edge 1141 (or relative to the reference surface 116) in the direction toward the cooling portion 21. Therefore, the surface of the battery cell 11 facing the cooling plate 20 is convex, and the battery cell 11 can adapt to the concave surface 211 of the cooling portion 21. This can increase the contact area between the battery cell 11 and the cooling plate 20 and improve the heat exchange efficiency between the battery cell 11 and the cooling plate 20. In addition, the protrusion of the contact surface 115 relative to the reference surface 116 can also ensure that the deformation of the battery cell 11 during expansion is consistent with expectations, and can provide the battery cell 11 with a deformation trend. When negative pressure is generated inside the battery cell 11, causing the battery cell 11 to expand, the deformation of the battery cell 11 can increase the protrusion of the contact surface 115, so that the expanded position of the battery cell 11 corresponds to the concave position of the cooling plate 20.

[0089] It should be noted that the contact surface 115 faces the cooling plate 20 and is convex, allowing the battery cell 11 to fit within the cooling portion 21. The battery cell 11 is generally hexahedral and has two opposing contact surfaces 115. When cooling plates 20 are provided on both sides of the battery cell 11, both contact surfaces 115 of the battery cell 11 can be convex.

[0090] In addition, in some embodiments, the battery pack 100 may further include a connection structure 50 , which is connected between the battery cell 11 and the cooling plate 20 . Thus, the battery cell 11 and the cooling plate 20 may be connected via the connection structure 50 .

[0091] In addition, in some embodiments, the connection structure 50 may be an adhesive, which generally has at least one of elasticity, insulation properties, and thermal conductivity.

[0092] The connection structure 50 is an adhesive, which can be used to connect the battery cell 11 and the cooling plate 20, thereby facilitating the connection between the battery cell 11 and the cooling plate 20. The adhesive has at least one of elasticity, insulation, and thermal conductivity. When the adhesive is elastic, the expansion of the battery cell 11 can also exert force on the adhesive, so that the adhesive can also deform with the expansion of the battery cell 11, thereby ensuring a tight connection between the battery cell 11 and the cooling plate 20. When the adhesive has insulation properties, it can prevent the formation of a conductive loop between the battery cell 11 and the cooling plate 20, which may cause malfunction of the battery pack 100. When the adhesive has thermal conductivity, it can meet the thermal conductivity requirements between the battery cell 11 and the cooling plate 20, facilitate the transfer of heat generated by the battery cell 11 to the cooling plate 20, and achieve a better cooling effect of the cooling plate 20 on the battery cell 11.

[0093] In some embodiments, the largest surface of the battery cell 11 is connected to the inner concave surface 211. Since the largest surface of the battery cell 11 is prone to expansion, at this time, by connecting the largest surface of the battery cell 11 to the inner concave surface 211, the expansion requirements of the battery cell 11 can be met, and the heat exchange area between the battery cell 11 and the cooling plate 20 can be larger, that is, the heat dissipation and expansion of the battery cell 11 can be taken into account to improve the service life of the battery pack.

[0094] In some embodiments, along the first direction X, the minimum dimension of the battery cell 11 is H mm, and the maximum dimension of the inner concave surface 211 is L mm, satisfying the following: 0.005 ≤ L / H ≤ 0.050. The presence of the inner concave surface 211 provides adequate expansion space for the battery cell 11. However, if the size of the inner concave surface 211 is larger than the amount of expansion of the battery cell 11, the expanded battery cell 11 cannot effectively exchange heat with the cooling portion 21, thereby affecting the cooling effect of the cooling plate 20 on the battery cell, and further shortening the service life of the battery pack 100. It can be understood that the battery cell 11 will expand during use, and the amount of expansion generally has a certain proportion. By controlling the ratio range of the maximum size of the inner concave surface 211 to the minimum size of the battery cell 11, the inner concave surface 211 has enough space to accommodate the expansion of the battery cell 11, thereby extending the service life of the battery cell 11 or the battery pack 100, and avoiding the transition depression of the inner concave surface 211, which causes the battery cell 11 in the battery pack and the inner concave surface 211 to be unable to effectively contact and exchange heat, resulting in a decrease in the cooling effect, thereby affecting the service life of the battery.

[0095] Among them, the method for measuring the maximum size of the concave surface 211 can be: placing the cooling plate 20 on a first measuring plane (which can be formed by a workbench or a flat plate) so that the concave surface 211 faces the first measuring plane, and then making the second measuring plane (which can be formed by a flat plate) parallel to the first measuring plane, moving the second measuring plane so that the second measuring plane contacts the end of the concave surface 211 away from the first measuring plane, measuring the distance between the first measuring plane and the second measuring plane to obtain a first measurement value, using a vernier caliper to measure the thickness of the cooling plate 20 to obtain a second measurement value, subtracting the second measurement value from the first measurement value to obtain the measurement value of the concave surface 211; repeating the above operation at least 3 times to obtain multiple measurement values ​​of the concave surface 211, and taking the average value to obtain the maximum size L of the concave surface 211.

[0096] The minimum size measurement method of the battery cell 11 can be: define the size of the battery cell 11 at the top cover (or edge position) as the minimum size, use a vernier caliper to measure the size of the top cover in the first direction X at least 3 times and take the average value to obtain the minimum size of the battery cell 11.

[0097] In other embodiments, the battery pack satisfies the following relationship: 0.010<L / H≤0.035, so as to better ensure the service life of the battery cell 11.

[0098] In some embodiments, 0.25≤L≤2.5, or 10≤H≤60. This configuration allows the size of the inner concave surface 211 or the battery cell 11 to be within a reasonable range, thereby satisfying the ratio relationship between the two and ensuring the service life of the battery cell 11 or the battery pack 100.

[0099] In other embodiments, the battery pack satisfies 0.25≤L≤2.5 and 10≤H≤60. Such a setting can ensure that the size of the inner concave surface 211 or the battery cell 11 is within a reasonable range, thereby satisfying the ratio relationship between the two to ensure the service life of the battery cell 11 or the battery pack 100.

[0100] In other embodiments, 0.5≤L≤1.75, and 15≤H≤50. By further limiting the maximum size of the inner concave surface 211 and the minimum size of the battery cell 11 , the service life of the battery cell 11 or the battery pack 100 can be better guaranteed.

[0101] In an embodiment of the present application, a battery pack 100 includes at least two battery columns 10 and at least one cooling plate 20. The at least two battery columns 10 are spaced apart along a first direction X, and a first gap 30 is provided between two adjacent battery columns 10 along the first direction X. Since the cooling plate 20 is disposed in the first gap 30, the cooling plate 20 can exchange heat with the battery columns 10 on both sides thereof, thereby cooling the battery columns 10. The battery array 10 includes a plurality of battery cells 11 distributed along a second direction Y. The cooling plate 20 has a first side wall 200 facing the battery cells 11 and connected to the battery cells 11. The first side wall 200 is provided with a plurality of cooling portions 21 spaced apart along the second direction Y. Since the cooling portions 21 are recessed in a direction away from the battery cells 11 in contact with the cooling portions 21, and at least a portion of the inner concave surface 211 of the cooling portions 21 is connected to the battery cells 11, a gap may be provided between the position where the cooling portions 21 are provided on the cooling plate 20 and the battery cells 11. On the one hand, a certain space can be reserved for the expansion of the battery cells 11, thereby preventing the battery cells 11 from exerting force on the cooling plate 20 after expansion. This results in a greater interaction force between the battery cell 11 and the cooling plate 20, leading to damage to one of them. Furthermore, the cooling portion 21 is recessed in a direction away from the battery cell 11 to which it is connected. Its inner concave surface 211 accommodates the expansion of the battery cell 11 after operation. After the battery cell 11 expands, the expanded portion connects better with the inner concave surface 211, and the expanded portion has a larger contact area with the flat surface. This improves the cooling effect on the battery cell 11 after expansion. Furthermore, the presence of the inner concave surface effectively reduces the force exerted by the cooling plate on the battery cell during initial use, thereby extending the service life of the battery cell and the battery pack. In other words, the cooling plate 20 provided in the embodiments of the present application can accommodate the expansion of the battery cell 11 during operation, providing sufficient expansion space for the battery cell 11. Furthermore, it can maintain good contact with the battery cell 11 after expansion, resulting in a better cooling effect on the battery cell 11 by the cooling plate 20 and an increased service life of the battery pack.

[0102] Test Example 1-12:

[0103] A battery pack 100 is provided, comprising eight battery columns 10 and nine cooling plates 20. The eight battery columns 10 are spaced apart along a first direction X, with a first gap 30 defined between adjacent battery columns 10 along the first direction X. The cooling plates 20 are disposed in the first gap 30. The battery columns 10 include ten battery cells 11, which are spaced apart along a second direction Y. The cooling plates 20 are provided with ten cooling portions 21, which are spaced apart along the second direction Y. The cooling portions 21 have inner concave surfaces 211, which are connected to the battery cells 11 and partially accommodate the battery cells 11.

[0104] Along the first direction X, the minimum dimension of the battery cell 11 is H mm, and the maximum dimension of the inner concave surface 211 is L mm.

[0105] Capacity fade rate test method:

[0106] A) At room temperature, the initial capacity was measured according to the method in 6.2 of GB / T31484-2015;

[0107] B) Discharge at 1I1(A) to the discharge termination condition;

[0108] C) Leave it for no less than 30 minutes;

[0109] D) Charge according to method 6.1.1.3 of GB / T31484-2015;

[0110] E) Leave it for no less than 30 minutes;

[0111] F) Discharge to the termination condition of 1I1(A) and record the discharge capacity;

[0112] G) Repeat C) to F) for 1000 cycles;

[0113] H) measuring the room temperature discharge capacity;

[0114] I) Capacity decay rate Q = (initial capacity - room temperature discharge capacity) / initial capacity × %.

[0115] By using the above test method, the test case is tested and the data obtained are as follows:

[0116] From the above tests, we can know that when the battery pack meets the following conditions: 0.005≤L / H≤0.050, the capacity attenuation rate Q can be kept within a lower range, which means that the battery pack has a longer service life.

[0117] In addition, an embodiment of the present application further provides an electric device, which includes the battery pack 100 in any of the above embodiments.

[0118] The electrical equipment includes a plurality of the above-mentioned battery packs 100. Since the cooling portion 21 is provided on the cooling plate 20 in the battery pack 100, the cooling plate 20 can adapt to the expansion of the battery cell 11 during operation, provide sufficient expansion space for the battery cell 11, and maintain good contact with the battery cell 11 after the battery cell 11 expands, so that the cooling plate 20 has a better cooling effect on the battery cell 11.

[0119] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0120] Although alternative embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including alternative embodiments and all changes and modifications that fall within the scope of the present invention.

[0121] The above is a detailed introduction to the technical solution provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A battery pack, wherein, The battery pack has intersecting first and second directions. The battery pack includes at least two battery rows and at least one cooling plate. The at least two battery rows are spaced apart along the first direction. Along the first direction, there is a first gap between two adjacent battery rows, and the cooling plate is disposed in the first gap; The battery row includes a plurality of battery cells, and the plurality of battery cells are distributed along the second direction. A plurality of cooling portions are provided on the cooling plate, and the plurality of cooling portions are spaced apart along the second direction. The cooling portion has a concave surface, and the concave surface is connected to the battery cell and the cooling portion accommodates part of the battery cell.

2. The battery pack according to claim 1, wherein, In the first direction, the cooling plate has opposite first and second side plates, and the first side plate is provided with the cooling portion; among the two adjacent side surfaces of the first side plate and the second side plate, at least one of them extends recessedly towards the other.

3. The battery pack according to claim 2, wherein, The cooling plate has a receiving cavity inside, and a support member is disposed in the receiving cavity. The support member is connected to the first side plate and / or the second side plate, and in a plane perpendicular to the first direction along the first direction, the projection of the support member falls within the projection of the cooling portion.

4. The battery pack according to claim 3, wherein, The support member includes a first support member and a second support member. In the first direction, the first support member has opposite first and second ends, and the second support member has opposite third and fourth ends; The first end of the first support member is connected to the first side plate, the second end of the first support member is spaced apart from the second side plate in the first direction, the third end of the second support member is connected to the second side plate, the fourth end of the second support member is spaced apart from the first side plate in the first direction, and the first support member and the second support member are arranged alternately along the second direction.

5. The battery pack according to claim 2, wherein, In the first direction, the battery cell has opposite first and second walls. The first wall is connected to the second side plate, the second wall is connected to the first side plate, the stiffness of the first wall is K1, the stiffness of the second wall is K2, the stiffness of the first side plate is K3, and the stiffness of the second side plate is K4. K1, K2, K3, and K4 satisfy: K1 > K4, and / or, K2 > K3.

6. The battery pack according to claim 1, wherein, In the second direction, there is a connecting portion between two adjacent cooling portions. The connecting portion is connected to both of the two adjacent cooling portions, and the connecting portion is in arc transition with the cooling portion; the connecting portion is connected to two adjacent battery cells along the second direction.

7. The battery pack according to claim 6, wherein At least part of the connecting portion protrudes from the surface of the cooling plate in a direction towards the battery cell adjacent to the cooling portion; In the second direction, there is a second gap between two adjacent battery cells, and at least part of the connecting portion is located in the second gap.

8. The battery pack according to claim 6, wherein, There are a plurality of the connecting portions, and the plurality of connecting portions and the plurality of cooling portions are alternately connected along the second direction. The thicknesses of the two ends of the cooling portion between two adjacent connecting portions along the second direction are greater than the thickness of the middle portion.

9. The battery pack according to claim 7, wherein, The cooling plate has an accommodation cavity inside. The connecting part has a first surface located inside the accommodation cavity, and the cooling part has a second surface located inside the accommodation cavity. The first surface is recessed from the second surface in the direction from the inside of the accommodation cavity to the outside of the accommodation cavity.

10. The battery pack according to claim 1, wherein, The battery cell has a first side surface, a second side surface, and a contact surface facing the cooling part. The first side surface has a first edge facing the contact surface, and the second side surface has a second edge facing the contact surface. The contact surface is connected to both the first edge and the second edge to connect the first side surface and the second side surface. The contact surface protrudes relative to the first edge and the second edge in the direction facing the cooling part. The contact surface is opposite to the cooling part in the first direction and is connected to the concave surface.

11. The battery pack according to claim 1, wherein, The battery pack further includes a connection structure, and the connection structure is connected between the battery cell and the cooling plate.

12. The battery pack according to claim 11, wherein, The connection structure is an adhesive.

13. The battery pack according to claim 1, wherein, The largest surface of the battery cell is connected to the concave surface.

14. The battery pack according to claim 1, wherein, In a plane perpendicular to the first direction along the first direction, the projection of the concave surface covers at least one of the battery cells in the second direction.

15. The battery pack according to claim 1, wherein, Along the first direction, the minimum dimension of the battery cell is H mm, and the maximum dimension of the concave surface is L mm, satisfying: 0.005 ≤ L / H ≤ 0.

050.

16. The battery pack according to claim 15, wherein, The battery pack satisfies: 0.010 < L / H ≤ 0.

035.

17. The battery pack according to claim 15, wherein, The battery pack satisfies: 0.5 ≤ L ≤ 5.

18. The battery pack according to claim 15, wherein, The battery pack satisfies: 10 ≤ H ≤ 60.

19. The battery pack according to claim 15, wherein, The battery pack satisfies: 0.5 ≤ L ≤ 5, and 10 ≤ H ≤ 60.

20. An electrical device, wherein, The electrical device includes the battery pack according to any one of claims 1-19.

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