Battery pack and electrical device

Abstract

The present invention provides a battery pack and an electrical device. The battery pack has a first direction, a second direction and a third direction, which intersect. The battery pack comprises at least two battery columns and at least one cooling plate. The at least two battery columns are distributed at intervals along the first direction, and a gap is formed between every two adjacent battery columns, the cooling plate being disposed in a gap. Each battery column comprises multiple battery cells, the multiple battery cells being distributed along the second direction. A cooling plate is provided with multiple concave portions, the multiple concave portions being distributed at intervals along the third direction, and the concave parts being recessed along a direction away from the battery cells in contact with the concave parts.

Description

Battery packs and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 18, 2023, with application number 202323465779.8 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 cell 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, a cooling plate is typically provided in the battery pack to cool the battery cells. The cooling plate is connected to the larger surface area of ​​the battery cells. When the battery cells generate heat during operation, the plate can exchange heat with the battery cells through this surface to cool the battery pack. However, the cooling plates proposed in the related art cannot adapt to the expansion of the battery cells, cannot provide sufficient expansion space for the battery cells, and are less effective in cooling the battery cells after expansion.

[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, a second direction, and a third direction intersecting each other. 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 the first direction, with a gap between adjacent battery columns. The cooling plate is disposed in the gap.

[0009] The battery column includes a plurality of battery cells, which are distributed along the second direction; the cooling plate is provided with a plurality of recessed portions, which are spaced apart along the third direction, and are recessed in a direction away from the battery cells in contact with the recessed portions.

[0010] Optionally, in the first direction, the cooling plate has a first side plate and a second side plate opposite to each other, and the first side plate is provided with a recessed portion.

[0011] Optionally, in the first direction, the cooling plate has a first side plate and a second side plate opposite to each other, and the second side plate is provided with the recessed portion.

[0012] Optionally, in the first direction, the cooling plate has a first side plate and a second side plate opposite to each other, and both the first side plate and the second side plate are provided with the recessed portion.

[0013] Optionally, the cooling plate has an accommodating cavity inside;

[0014] A first support member is provided in the accommodating cavity, and an extension direction of the first support member is obliquely intersected with an extension direction of the first side plate or the second side plate, the first support member has a first end and a second end, the first end of the first support member is connected to the first side plate, and the second end of the first support member is connected to the second side plate, the first end of the first support member and the recessed portion on the first side plate are spaced apart along the third direction, and the second end of the first support member and the recessed portion on the second side plate are spaced apart along the third direction.

[0015] Optionally, the first support member is connected to the first side panel and transitions in an arc.

[0016] Optionally, the first support member is connected to the second side panel and transitions in an arc.

[0017] Optionally, the first support member is connected to the first side panel and transitions in a circular arc, and the first support member is connected to the second side panel and transitions in a circular arc.

[0018] Optionally, a second support member is further provided in the accommodating cavity, one end of the second support member is connected to the first side panel, the other end of the second support member is spaced apart from the second side panel in the first direction, and along the first direction on a plane perpendicular to the first direction, the orthographic projection of the second support member falls into the recessed portion on the second side panel.

[0019] Optionally, a second support member is further provided in the accommodating cavity, one end of the second support member is connected to the first side panel, the other end of the second support member is spaced apart from the second side panel in the first direction, and along the first direction on a plane perpendicular to the first direction, the orthographic projection of the second support member falls into the recessed portion on the first side panel.

[0020] Optionally, a second support member is further provided in the accommodating cavity, one end of the second support member is connected to the first side panel, the other end of the second support member is spaced apart from the second side panel in the first direction, and along the first direction on a plane perpendicular to the first direction, the orthographic projection of the second support member falls into the recessed portion on the second side panel and the recessed portion on the first side panel.

[0021] Optionally, in the third direction, the first support member and the second support member are arranged at intervals.

[0022] Optionally, a connecting portion is provided between two adjacent recessed portions, the connecting portion is connected to both adjacent recessed portions, and there is an arc transition between the connecting portion and the recessed portions.

[0023] Optionally, the cooling plate has an accommodating cavity inside, the first side plate and the second side plate are both provided with the recessed portion, the first side plate has a first surface located inside the accommodating cavity, a protrusion opposite to the recessed portion in the first direction is provided on the first surface, the connecting portion has a second surface located inside the accommodating cavity, and the protrusion protrudes and extends from the plane of the second surface toward the second side plate.

[0024] Optionally, in the first direction, the average thickness of the first side plate or the second side plate is D mm, the maximum size of the cooling plate is H2 mm, and the minimum size of the accommodating cavity is H1 mm, satisfying: 0<(H2-H1-2D) / (2H2)≤0.3.

[0025] Optionally, the battery pack satisfies: 0.05<(H2-H1-2D) / (2H2)≤0.16.

[0026] Optionally, the battery pack meets at least one of the following conditions:

[0027] I) 0.4≤D≤1;

[0028] II) 0.6≤H1≤4;

[0029] III)3≤H2≤8.

[0030] Optionally, along the first direction and on a plane perpendicular to the first direction, an orthographic projection of the recessed portion on the first side panel and an orthographic projection of the recessed portion on the second side panel have at least partial overlap.

[0031] In a second aspect, an embodiment of the present application provides an electric device, which includes a plurality of battery packs described in the first aspect.

[0032] In an embodiment of the present application, a 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 a gap is defined between adjacent battery columns along the first direction. Because the cooling plate is disposed in the gap, the cooling plate can exchange heat with the battery columns on either side, thereby cooling the battery columns. The battery columns include a plurality of battery cells distributed along a second direction. The cooling plate has a first sidewall facing and connected to the battery cells. The first sidewall is provided with a plurality of recessed portions spaced apart along a third direction. When the battery cells expand after operation, the battery cells exert a force on the first sidewall. Because the recessed portions are recessed away from the battery cells in contact with the recessed portions, the provision of the recessed portions can cause the cooling plate to deform away from the battery cells, facilitating deformation of the cooling plate. This allows the first sidewall connected to the battery cells to deform as the battery cells expand, thereby preventing the first sidewall and the battery cells from abutting against each other, which could result in a large force between the first sidewall and the battery cells and damage to one of the two. Compared with the flat cooling plate in the related art, the cooling plate proposed in the embodiment of the present application has a recessed portion, which can make the length of the cooling plate at the recessed position longer, so that the cooling plate has a deformation margin when subjected to the force, and can avoid the problem that the cooling plate is pulled by itself and difficult to deform when subjected to the force applied by the battery cell. That is, the cooling plate provided in the embodiment of the present application is easy to deform when the battery cell expands, and can adapt to the expansion of the battery cell. After the cooling plate is deformed, the contact between the expanded battery cell and the cooling plate can be better, and the cooling effect of the cooling plate on the battery cell is also better.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 shows an exploded view of a battery pack provided in an embodiment of the present application;

[0035] FIG2 is a schematic diagram showing the connection between a battery array and a cooling plate provided in an embodiment of the present application;

[0036] FIG3 shows a cross-sectional view taken along line AA in FIG2 ;

[0037] FIG4 is a schematic diagram showing a plurality of cold plates provided in an embodiment of the present application;

[0038] FIG5 shows a cross-sectional view taken along line BB in FIG4 ;

[0039] FIG6 shows a partial enlarged view of point C in FIG5 ;

[0040] FIG7 is a partial schematic diagram of a first side panel provided in an embodiment of the present application;

[0041] FIG8 is a partial schematic diagram of a second side panel provided in an embodiment of the present application;

[0042] FIG9 is a schematic diagram of a cooling plate provided in an embodiment of the present application;

[0043] FIG10 is a schematic diagram showing a connection between a cooling plate and a battery cell provided in an embodiment of the present application;

[0044] FIG11 shows a partial schematic diagram of a cooling plate provided in an embodiment of the present application.

[0045] Reference numerals:

[0046] 100: Battery pack; 10: Battery array; 20: Cooling plate; 11: Battery cell; 12: Gap; 21: First side wall; 211: Recessed portion; 22: First side panel; 23: Second side panel; 24: First wall panel; 25: Second wall panel; 201: Accommodating chamber; 31: First support member; 32: Flow channel; 33: Second support member; 223: Connecting portion; 101: Upper cover; 102: Box body; 103: Bottom plate; 311: First connection; 312: Second connection; 224: Third connection; 313: First end; 314: Second end; 2111: First surface; 2112: Protrusion; 2113: Second surface; X: First direction; Y: Second direction; Z: Third direction. Specific embodiments

[0047] 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.

[0048] 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.

[0049] 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%.

[0050] As shown in Figures 1 to 10, a battery pack 100 has a first direction X, a second direction Y, and a third direction Z 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, with gaps 12 between adjacent battery columns 10 along the first direction X. The cooling plate 20 is disposed in these gaps 12. 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 recesses 211, which are spaced apart along the third direction Z and are recessed away from the battery cells 11 in contact with the recesses 211. Specifically, the cooling plate 20 has a first sidewall 21 facing and connected to the battery cells 11. The recesses 211 are disposed on the first sidewall 21.

[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 gap 12 is provided between two adjacent battery columns 10 along the first direction X. Since the cooling plate 20 is disposed in the gap 12, 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, and the cooling plate 20 has a first side wall 21 facing the battery cell 11 and connected to the battery cell 11. The first side wall 21 is provided with a plurality of recessed portions 211 spaced apart along a third direction Z. When the battery cell 11 expands after operation, the battery cell 11 exerts a force on the first side wall 21. Since the recessed portions 211 are recessed in a direction away from the battery cell 11 in contact with the recessed portions 211, the provision of the recessed portions 211 can make the cooling plate 20 have a tendency to deform in a direction away from the battery cell 11, making it easy to achieve deformation of the cooling plate 20, so that the first side wall 21 connected to the battery cell 11 can deform as the battery cell 11 expands, thereby avoiding the first side wall 21 and the battery cell 11 from abutting against each other, resulting in a large force between the first side wall 21 and the battery cell 11, causing damage to one of them. Compared with the flat cooling plate 20 in the related art, the cooling plate 20 proposed in the embodiment of the present application has a recessed portion 211, which can make the length of the cooling plate 20 at the recessed position longer, so that the cooling plate 20 has a deformation margin when subjected to a force, and can avoid the problem that the cooling plate 20 is pulled by itself and difficult to deform when subjected to the force applied by the battery cell 11. That is, the cooling plate 20 provided in the embodiment of the present application is easy to deform when the battery cell 11 expands, and can adapt to the expansion of the battery cell 11. After the cooling plate 20 is deformed, the contact between the expanded battery cell 11 and the cooling plate 20 can be better, and the cooling effect of the cooling plate 20 on the battery cell 11 is also better.

[0052] That is, the cooling plate 20 in the battery pack 100 provided in the embodiment of the present application can deform as the battery cell 11 expands, and can provide a suitable expansion space for the battery cell 11, so as to avoid the cooling plate 20 inhibiting the expansion of the battery cell 11, and can reduce the risk of the battery cell 11 being pierced by dendrites generated inside the battery cell 11 under the action of internal negative pressure and the restriction of the cooling plate 20, thereby avoiding the problem that the setting of the cooling plate 20 affects the safety of use and life of the battery cell 11.

[0053] It should be noted that the battery pack 100 has intersecting first, second, and third directions, X, Y, and Z. 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 at an angle. Specifically, 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 a cooling unit. The battery pack 100 may also include a housing 102. The multiple battery cells 11 are disposed within the housing 102 and contact a bottom plate 103 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 103.

[0054] The third direction Z intersects both the first direction X and the second direction Y. The first direction X and the second direction Y are parallel to the bottom plate 103 of the box body 102. The third direction Z may intersect the bottom plate 103. The box body 102 may further include an upper cover 101. As shown in FIG1 , the upper cover 101 is opposed to the bottom plate 103 and can seal the box body 102. The third direction Z may be aligned with the direction from the bottom plate 103 to the upper cover 101. The third direction Z is perpendicular to the bottom plate 103.

[0055] It should also be noted that 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 is not specifically limited in the embodiment of the present application.

[0056] In addition, in the embodiment of the present application, a plurality of recessed portions 211 are provided on the first side wall 21, and the plurality of recessed portions 211 are distributed along the third direction Z. The positions of the first side wall 21 where the recessed portions 211 are provided and the positions of the first side wall 21 where the recessed portions 211 are not provided are staggered. The recessed portions 211 may extend from one end of the first side wall 21 to the other end of the first side wall 21 along the second direction Y, so that the first side wall 21 may be wavy in the second direction Y, as shown in FIG5 . Of course, the first side wall 21 may also have other shapes. For example, when the number of battery cells 11 in the battery array 10 is two, one first side plate 22 is connected to two battery cells 11. In this case, the recessed portions 211 in the regions corresponding to the two battery cells 11 may be staggered, as shown in FIG10 , where E indicates the region of the cooling plate 20 corresponding to the battery cell 11.

[0057] In addition, in some embodiments, as shown in FIG2 , in the first direction X, the cooling plate 20 has a first side plate 22 and a second side plate 23 that are opposite to each other, and the first side plate 223 forms the first side wall 21, or the second side plate 23 forms the first side wall 21, or both the first side plate 22 and the second side plate 23 form the first side wall 21. In other words, the recessed portion 21 can 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 23.

[0058] 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 with the battery cells 11 in the two adjacent battery columns 10. In some embodiments, the first side plate 22 or the second side plate 23 may form the first side wall 21, so that the recessed portion 211 may be provided on the first side plate 22 or the second side plate 23, thereby cooling the battery cells 11 connected to the first side plate 22 or the second side plate 23 and allowing the first side plate 22 and the second side plate 23 to deform in response to the expansion of the battery cells 11.

[0059] When the recessed portion 211 is provided on the first side plate 22, the recessed portion 211 can connect with the battery cells 11 in the battery column 10 that the first side plate 22 faces, providing expansion space for these battery cells 11. Furthermore, after these battery cells 11 expand during operation, the recessed portion 211 can maintain good contact with these battery cells 11, thereby improving the cooling effect of the cooling plate 20 on these battery cells 11. When the recessed portion 211 is provided on the second side plate 23, the recessed portion 211 can connect with the battery cells 11 in the battery column 10 that the second side plate 23 faces, providing expansion space for these battery cells 11. Furthermore, after these battery cells 11 expand during operation, the recessed portion 211 can maintain good contact with these battery cells 11, thereby improving the cooling effect of the cooling plate 20 on these battery cells 11. When the recessed portion 211 is provided on the first side plate 22 and the second side plate 23, the recessed portion 211 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 achieving a better cooling effect for the battery cells 11 in the two battery columns 10 of the cooling plate 20.

[0060] It should be noted that when the recessed portion 211 is provided on the first side plate 22 or the second side plate 23, the recessed portion 211 can cool a column of battery columns 10, and can be provided to be connected to the battery column 10 located at the very edge, so that the battery column 10 located at the very 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 very edge can also be better, and the problem of wasting part of the recessed portion 211 on the cooling plate 20 that is only connected to the battery column 10 at the edge can be avoided.

[0061] In other embodiments, both the first side plate 22 and the second side plate 23 may form the first side wall 21. This means that there are multiple first side walls 21, one of which is formed on the first side plate 22 and the other is formed on the second side plate 23. In this case, both sides of the cooling plate 20 can absorb the expansion of the battery cells 11.

[0062] In addition, in some embodiments, as shown in Figures 4, 5, and 6, the cooling plate 20 has an accommodating cavity 201 inside; a first support member 31 is provided in the accommodating cavity 201, and the first support member 31 has a first end 313 and a second end 314. The first end 313 of the first support member 31 is connected to the first side plate 22, and the second end 314 of the first support member 31 is connected to the second side plate 23. The first end 313 of the first support member 31 and the recessed portion 211 on the first side plate 22 are staggered along the third direction Z, and the second end 314 of the first support member 31 and the recessed portion 211 on the second side plate 23 are spaced apart along the third direction Z.

[0063] The cooling plate 20 has an accommodating cavity 201 inside, and a first support member 31 is arranged in the accommodating cavity 201. The extension direction of the first support member 21 is obliquely intersected with the extension direction of the first side plate 22 and the second side plate 23. The first support member 31 is connected to the first side plate 22 and the second side plate 23. Specifically, the first support member 31 has a first end 313 and a second end 314. The first end 313 of the first support member 31 can be connected to the first side plate 22, and the second end 314 of the first support member 31 can be connected to the second side plate 23. Because the first end 313 of the first support member 31 is spaced apart from the recessed portion 211 on the first side panel 22 along the third direction Z, and the second end 314 of the first support member 31 is staggered with the recessed portion 211 on the second side panel 23 along the third direction Z, the connection position between the first support member 31 and the cooling plate 20 can be staggered with the recessed portion 211, thereby preventing the first support member 31 from obstructing the deformation of the recessed portion 211, thereby allowing the first side panel 22 or the second side panel 23 to have corresponding deformation space. Specifically, the extension direction of the first side panel 22 or the second side panel 23 can be understood as the overall extension direction of the first side panel 22 or the second side panel 23.

[0064] In the third direction Z, the first end 313 of the first support member 31 and the second end 314 of the first support member 31 may also be spaced apart, so that the first end 313 of the first support member 31 and the second end 314 of the first support member 31 can be connected to the cooling plate 20 at different positions in the third direction Z, so that the first support member 31 is inclined relative to the cooling plate 20 and has an angle with the first direction X. The inclined first support member 31 can cause the cooling plate 20 to have a tendency to deform, thereby preventing the problem of the first side plate 22 and the second side plate 23 being subjected to force when the first support member 31 is in a straight state (the connection position of the first end 313 of the first support member 31 and the first side plate 22 and the connection position of the first end 313 of the first support member 31 and the second side plate 23 are opposite). The force applied to the first support member 31 is along the extension direction of the first support member 31, which has a stronger supporting effect on the first side plate 22 and the second side plate 23, thereby preventing the deformation of the first side plate 22 and the second side plate 23.

[0065] In the embodiment of the present application, the first support member 31 is arranged at an angle, and a first preset angle α may be provided between the first support member 31 and the first reference plane. As shown in FIG7 , the first preset angle α satisfies: 0<α≤45°, so that the first support member 31 can be arranged at an angle in the accommodating cavity 201, which facilitates the deformation of the cooling plate 20. Specifically, α can be 15°, 20°, 35°, 38°, 40°, 45°, etc. The embodiment of the present application does not specifically limit the specific angle value of the first preset angle α. When the first preset angle α is small, when the first support member 31 is arranged between the first side plate 22 and the second side plate 23, the length of the first support member 31 is long, which is not conducive to the arrangement of the first support member 31, and the number of first support members 31 that can be arranged in the accommodating cavity 201 is small. In order to facilitate the arrangement of the first support member 31, the first preset angle α satisfies: 20°≤α≤45°. Correspondingly, a second preset angle β may be formed between the first support member 31 and the second reference plane. As shown in FIG8 , the second preset angle β satisfies: 0<β≤45°.

[0066] The first reference plane may be a plane formed by a portion of the first side panel 22 not provided with the recessed portion 211, and the second reference plane may be a plane formed by a portion of the second side panel 23 not provided with the recessed portion 211. The following describes the process for measuring the first preset angle α. During actual testing, a plane may be set up, and the first side panel 22 may be placed on the plane so that the portion of the first side panel 22 not provided with the recessed portion 211 abuts the plane. The position of the first support member 31 may be recorded, and the angle between the first support member 31 and the plane may be measured to obtain the preset angle α.

[0067] It should be noted that, as shown in FIG5 , the cooling plate 20 may further include a first wall plate 24 and a second wall plate 25 , wherein the first side plate 22 and the second side plate 23 are both connected between the first wall plate 24 and the second wall plate 25 , and the first side plate 22 , the second side plate 23 , the first wall plate 24 and the second wall plate 25 enclose a receiving cavity 201 . The first side plate 22 may be connected to the first wall plate 24 and the second side plate 23 by an arc structure, and the second side plate 23 may also be connected to the first wall plate 24 and the second side plate 23 by an arc structure, thereby forming an arc transition between the first side plate 22 and the first wall plate 24 and the second wall plate 25 , and an arc transition between the second side plate 23 and the first wall plate 24 and the second wall plate 25 , which can reduce stress concentration and avoid the problem that the cooling plate 20 is easily damaged by the force of the battery cell 11 when the battery cell 11 expands.

[0068] It should also be noted that the number of the first support members 31 can be multiple, wherein the multiple first support members 31 can be parallel to each other, as shown in Figure 5. When the battery cell 11 expands, the forces on the mutually parallel first support members 31 are relatively consistent, which can facilitate the deformation of the first side plate 22 and the second side plate 23, and avoid the phenomenon that the first side plate 22 and the second side plate 23 abut against each other at the positions of some first support members 31 due to the non-parallelism of the multiple first support members 31, which is beneficial to the inward deformation of the first side plate 22 and the second side plate 23 under the expansion of the battery cell 11.

[0069] In addition, the specific position relationship between the first support member 31 and the recessed portion 211 can be various. For example, the connection position of the first support member 31 and the first side panel 22 can be staggered one by one with the recessed portion 211 on the first support member 31, and the connection position of the first support member 31 and the second side panel 23 can be staggered one by one with the recessed portion 211 on the second support member 33, so that a recessed portion 211 is provided between any two adjacent first support members 31, and any two adjacent recessed portions 211 are connected to the first support member 31. As shown in Figure 5, the first support member 31 has a better supporting effect on the first side panel 22 and the second side panel 23, and can provide strength support for the cooling plate 20; or, the connection position of the first support member 31 and the first side panel 22 can also be staggered at intervals with the recessed portion 211 on the first support member 31. The staggered arrangement can be used. The connection position of the first support member 31 and the second side panel 23 can also be staggered with the recessed portion 211 on the second side panel 23, that is, there can be multiple recessed portions 211 on the first side panel 22 between two adjacent first support members 31, and there can be multiple recessed portions 211 on the second side panel 23 between two adjacent first support members 31; or, after the first support member 31 is connected to the accommodating cavity 201, there can be no recessed portion 211 between the two adjacent first support members 31, that is, there is no recessed portion 211 between the first ends 313 of the two adjacent first support members 31, and there is no recessed portion 211 between the second ends 314 of the two adjacent first support members 31. The specific positional relationship between the first support member 31 and the recessed portion 211 is not specifically limited in the embodiment of the present application.

[0070] In addition, in some embodiments, as shown in FIG. 6 , the first support member 31 is connected to the first side plate 22 and has an arc transition.

[0071] In addition, in some embodiments, the first support member 31 is connected to the second side plate 23 and has an arc transition.

[0072] In addition, in some embodiments, the first support member 31 is connected to the first side plate 22 and the second side plate 23 and has an arc transition.

[0073] That is, the first support member 31 is connected to the second side plate 23 and has an arc transition. Alternatively, the first support member 31 is connected to the second side plate 23 and has an arc transition. Alternatively, the first support member 31 is connected to both the first side plate 22 and the second side plate 23 and has an arc transition.

[0074] Specifically, the first support member 31 is connected to the second side panel 23 and forms a second connection 312 at an acute angle between the two, and the second connection 312 is a second arc structure; the first support member 31 is connected to the first side panel 22 and forms a first connection 311 at an acute angle between the two, and the first connection 311 is a first arc structure.

[0075] In this way, the connection between the first support member 31 and the cooling plate 20 can be prevented from having sharp corners, thereby reducing stress concentration and preventing the cooling plate 20 from deforming after being subjected to the force of the battery cell 11, thereby preventing the first support member 31 from being damaged.

[0076] In addition, in some embodiments, as shown in Figures 3, 5, and 6, a second support member 33 may also be provided in the accommodating cavity 201, one end of the second support member 33 is connected to the first side panel 22, and the other end of the second support member 33 is spaced apart from the second side panel 23 in the first direction X. Along the first direction X and on a plane perpendicular to the first direction X, the orthographic projection of the second support member 33 falls into the recessed portion 211 of the first side panel 22 or the second side panel 23.

[0077] In other embodiments, along the first direction X and on a plane perpendicular to the first direction X, the orthographic projection of the second support member 33 falls into the recessed portions 211 of the first side plate 22 and the second side plate 23 .

[0078] It can be understood that the recessed portion 211 on the first side plate 22 or the second side plate 23 is arranged opposite to the second support member 33 .

[0079] Alternatively, it can be understood that the recessed portions 211 on the first side plate 22 and the second side plate 23 are both arranged opposite to the second support member 33 .

[0080] A second support member 33 is also provided in the accommodating cavity 201. One end of the second support member 33 is connected to the first side plate 22. Because the other end of the second support member 33 is spaced apart from the second side plate 23 in the first direction X, a distance exists between the other end of the second support member 33 and the second side plate 23. During the expansion of the battery cell 11, the battery cell 11 can compress the cooling plate 20, causing the first side plate 22 and the second side plate 23 to approach each other. This allows the other end of the second support member 33 to approach the second side plate 23, reducing the distance between the other end of the second support member 33 and the second side plate 23. As the battery cell 11 expands, the force exerted by the battery cell 11 on the cooling plate 20 also increases, causing the recessed portion 211 to become more concave. The provision of the second support member 33 prevents the battery cell 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 action of the battery cell 11, which could cause blockage of the accommodating cavity 201. In order to achieve a better cooling effect of the cooling plate 20 on the battery cell 11 , a coolant is usually provided in the accommodating cavity 201 .

[0081] Because the second support member 33 is opposite the recessed portion 211, when the battery cell 11 expands, the second support member 33 can move over a larger range as the cooling plate 20 compresses. This allows the cooling plate 20 to compress more, thereby better accommodating the expansion of the battery cell 11. This avoids the problem of the second support member 33 abutting against the second side plate 23 when the battery cell 11 expands less when the second support member 33 is opposite a position where the recessed portion 211 is not provided, thereby preventing the cooling plate 20 from further compressing. Specifically, to allow the cooling plate 20 to compress after the battery cell 11 expands and to allow the second support member 33 to move relative to the second side plate 23, the distance between the recessed portion 211 opposite the second support member 33 and the other end of the second support member 33 is set to be greater than a predetermined distance. The predetermined distance is the minimum distance between the recessed portion 211 on the first side plate 22 and the recessed portion 211 on the second side plate 23.

[0082] It should be noted that, in addition to the aforementioned connection of the second support member 33 to the first side plate 22 , the second support member 33 may also be connected to the cooling plate 20 in other ways, which can also prevent the battery cells 11 from excessively pressing the cooling plate 20 . For example, one end of the second support member 33 may be connected to the second side plate 23 , and the other end of the second support member 33 may be spaced apart from the first side plate 22 in the first direction X. As shown in FIG. 9 , a schematic diagram is shown in which, after the cooling plate 20 is deformed, the second support member 33 on the first side plate 22 abuts against the second side plate 23 , and the second support member 33 on the second side plate 23 abuts against the first side plate 22 , respectively.

[0083] It should also be noted that the second support member 33 can extend along the first direction X, and the angle with the position on the first side plate 22 where the recessed portion 211 is not provided can be 90°. When the cooling plate 20 is compressed and the second support member 33 abuts against the second side plate 23, the force applied to the second support member 33 is along the first direction X, which is consistent with the extension direction of the second support member 33, and can withstand a larger force, thereby avoiding the problem of the second support member 33 being tilted and easily broken under force.

[0084] In addition, in some embodiments, as shown in FIG. 6 , in the third direction Z, the first support member 31 and the second support member 33 may be spaced apart.

[0085] In the embodiment of the present application, the first support member 31 and the second support member 33 are arranged at intervals along the third direction Z. Therefore, the first support member 31 and the second support member 33 are connected at different positions in the accommodating cavity 201, which can facilitate the setting of the first support member 31 and the second support member 33, and can also avoid the problem of the second support member 33 interfering with the deformation of the first support member 31.

[0086] In addition, in some embodiments, as shown in Figures 5 and 6, there is a connecting portion 223 between two adjacent recessed portions 211, the connecting portion 223 is connected to both adjacent recessed portions 211, and there is an arc transition between the connecting portion 223 and the recessed portions 211; specifically, the connecting portion 223 is connected to the recessed portions 211 and forms a third connection 224 at the portion where the two are connected, and the third connection 224 is a third arc structure.

[0087] A connecting portion 223 is connected between two adjacent recessed portions 211, and the connecting portion 223 is connected to the recessed portion 211 to form a third connection 224, wherein the third connection 224 can also be an arc transition, so that an arc transition is formed between the position where the recessed portion 211 is provided on the first side wall 21 and the position where the recessed portion 211 is not provided, which can avoid sharp corners on the first wall panel 24, thereby reducing stress concentration and avoiding deformation of the cooling plate 20 after being subjected to the force of the battery cell 11, resulting in the problem of easy damage to the first wall panel 24.

[0088] In addition, in some embodiments, as shown in Figure 6, the cooling plate 20 has an accommodating cavity 201 inside, and the first side plate 22 and the second side plate 23 both form a first side wall 21, that is, it can be understood that the first side plate 22 and the second side plate 23 are both provided with a recessed portion 211, and the first side plate 22 has a first surface 2111 located inside the accommodating cavity 201, and a protrusion 2112 opposite to the recessed portion 211 in the first direction X is provided on the first surface 2111, and the connecting portion 223 has a second surface 2113 located inside the accommodating cavity 201, and the protrusion 2112 protrudes and extends from the plane of the second surface 2113 toward the second side plate 23.

[0089] The cooling plate 20 has an interior containing a cavity 201. The first side wall 21 has a first surface 2111 located within the cavity 201. A protrusion 2112 is provided on the first surface 2111, opposite to the recessed portion 211. The connecting portion 223 has a second surface 2113 located within the cavity 201. Since both the first side plate 22 and the second side plate 23 can form the first side wall 21, and the protrusion 2112 extends from the plane of the second surface 2113 toward the other first side wall 21, if the protrusion 2111 is provided on the first side plate 22, the first surface 2211 of the first side plate 22 can protrude from the first side plate 22 to the second side plate 23; and if the protrusion 2111 is provided on the second side plate 23, the first surface 2211 of the second side plate 23 can protrude from the second side plate 23 to the first side plate 22. That is, a protrusion 211 extending along one first side wall 21 toward the other first side plate 21 is provided on the inner surface of the first side wall 21. Since the protruding portion on the inner surface of the first side wall 21 is opposite to the recessed portion 211 along the first direction X, the inner surface of the first side wall 21 where the recessed portion 211 is provided has the same shape as the outer surface, and the thickness of the recessed portion 211 at each location can be consistent, which can make the strength of the connecting portion 223 greater.

[0090] In addition, in some embodiments, as shown in FIG11 , in the first direction X, the average thickness of the first side plate 22 or the second side plate 23 is D mm, the maximum dimension of the cooling plate 20 is H2 mm, and the minimum dimension of the accommodating cavity 201 is H1 mm, satisfying: 0<(H2-H1-2D) / (2H2)≤0.3.

[0091] In the first direction X, the first side plate 22 has an average thickness of D mm, the cooling plate 20 has a maximum dimension of H2 mm, and the accommodating cavity 201 has a minimum dimension of H1 mm. The maximum dimension of the cooling plate 20 is the maximum distance between the outer surfaces of the connecting portion 223 on the first side plate 22 and the outer surfaces of the connecting portion 223 on the second side plate 23. The minimum dimension of the accommodating cavity 201 is the distance between the inner surfaces of the recessed portion 221 on the first side plate 22 and the inner surfaces of the recessed portion 211 on the second side plate 23. D, H2, and H1 satisfy the following: 0 < (H2 - H1 - 2D) / (2H2) ≤ 0.3. This ensures that the cooling plate 20 effectively cools the battery cells 11 during charging and discharging, while also effectively absorbing the expansion of the battery cells 11, thereby extending the service life of the battery pack.

[0092] Among them, the specific value of (H2-H1-2D) / (2H2) is between 0 and 0.3, specifically, it can be 0.01, 0.04, 0.08, 0.15, 0.26, 0.3, etc. The specific value of (H2-H1-2D) / (2H2) is not specifically limited in this embodiment of the present application.

[0093] In some embodiments, the average thickness of the first side plate 22 or the second side plate 23 satisfies: 0.4≤D≤1.

[0094] In some embodiments, the minimum size of the accommodating cavity 201 satisfies 0.6≤H1≤4.

[0095] In some embodiments, the maximum size of the cooling plate 20 satisfies 4≤H2≤8.

[0096] In other embodiments, the following conditions are simultaneously satisfied: 0.4≤D≤1, 0.6≤H1≤4, and 4≤H2≤8.

[0097] It should be noted that the average thickness of the first side panel 22 or the second side panel 23 is D mm. The average thickness of the first side panel 22 or the second side panel 23 can be obtained by measuring the thickness of the first side wall 21 at locations where the recessed portion 211 is provided and at locations where the recessed portion 211 is not provided using a vernier caliper. The average of at least three average values ​​is then calculated to obtain the average thickness of the first side panel 22 or the second side panel 23. If a protrusion 2112 is provided on the first surface 2111 of the first side wall 21, opposing the recessed portion 211 in the first direction X, and the protrusion 2112 extends from the plane of the second surface 2113 toward the other first side wall 21, and the inner and outer surfaces of the first side wall 21 at the locations where the recessed portion 211 is provided have the same shape, then the thickness of the recessed portion 211 can be uniform at all locations. The average dimension of the first side wall 21 is the thickness at any location on the first side wall 21.

[0098] The maximum size of the cooling plate 20 can be measured by the following method: first set up a plane (which can be a flat plate or a platform), place the cooling plate 20 on the plane so that the first side plate 22 of the cooling plate 20 is in contact with the plane, and then place another plane (which can be a flat plate or a platform) on the cooling plate 20, take at least three points on each of the two planes to form 3 groups of test points, measure the distance between the two planes and take the average value to obtain the average size of the cooling plate 20.

[0099] The minimum size of the accommodating cavity 201 can be measured by the following method: cut the cooling plate 20 along the cross section, set up a plane (which can be a flat plate or a platform), place the cooling plate 20 on the plane so that the first side plate 22 of the cooling plate 20 is in contact with the plane, and then use a ruler or a protractor to make an auxiliary surface perpendicular to the plane, and then use another ruler or protractor to make another plane parallel to the plane, and the position of the plane passing through the first side plate 22 closest to the second side plate 23 is recorded as the first reference, repeat the above steps for the second side plate 23, find the second reference on the second side plate 23, measure the distance between the first reference and the second reference at least 3 times and take the average value to obtain the minimum size of the accommodating cavity 201.

[0100] In addition, in some embodiments, the battery pack 100 may be configured to satisfy 0.05<(H2-H1-2D) / (2H2)≤0.16, which can take into account both the cooling effect of the cooling plate 20 on the battery pack 100 and the service life of the battery pack 100.

[0101] It should be noted that the specific values ​​of (H2-H1-2D) / (2H2) are 0.051, 0.056, 0.06, 0.08, 0.1, 0.14, 0.16, etc. The specific values ​​of (H2-H1-2D) / (2H2) are not specifically limited in the embodiments of the present application.

[0102] In some embodiments, the battery pack 100 satisfies: 0.4≤D≤1.

[0103] In some embodiments, the battery pack 100 satisfies: 0.6≤H1≤4.

[0104] In some embodiments, the battery pack 100 satisfies: 3≤H2≤8.

[0105] In some embodiments, the battery pack 100 satisfies: 0.4≤D≤1, 0.6≤H1≤4.

[0106] In some embodiments, the battery pack 100 satisfies: 0.4≤D≤1, 3≤H2≤8.

[0107] In some embodiments, the battery pack 100 satisfies: 0.6≤H1≤4, 3≤H2≤8.

[0108] In some embodiments, the battery pack 100 satisfies: 0.4≤D≤1, 0.6≤H1≤4, 3≤H2≤8.

[0109] At this time, the battery pack can be made to satisfy the above relationship, thereby taking into account both the cooling effect and the service life of the battery pack.

[0110] In addition, in some embodiments, along the first direction X and on a plane perpendicular to the first direction X, an orthographic projection of the recessed portion 211 on the first side plate 22 and an orthographic projection of the recessed portion 211 on the second side plate 23 at least partially overlap.

[0111] The orthographic projections of the recessed portion 211 on the first side plate 22 and the recessed portion 211 on the second side plate 23 have at least partial overlap. When the battery cells 11 on both sides of the cooling plate 20 expand, the battery cells 11 on both sides can apply force to both the first side plate 22 and the second side plate 23. At this time, both the first side plate 22 and the second side plate 23 are subjected to the force toward the inside of the accommodating cavity 201, and can be squeezed and deformed. Since the recessed portion 211 on the first side plate 22 and the recessed portion 211 on the second side plate 23 have overlapping portions, the portion directly opposite to the recessed portion 211 is also a curved surface with relatively low strength, which can facilitate the deformation of the first side plate 22 and the second side plate 23.

[0112] In addition, in some embodiments, the orthographic projection of the recessed portion 211 on the first side plate 22 and the orthographic projection of the recessed portion 211 on the second side plate 23 may not overlap at all. At this time, the recessed portion 211 on the first side plate 22 is opposite to the position on the second side plate 23 where the recessed portion 211 is not provided, and the recessed portion 211 on the second side plate 23 is opposite to the position on the first side plate 22 where the recessed portion 211 is not provided, so that the surface facing the recessed portion 211 is a plane, and the strength of the plane is relatively large and it is not easy to deform, so that the strength of the cooling plate 20 is relatively large and it is suitable for battery cells 11 with a smaller amount of expansion.

[0113] In addition, in some embodiments, as shown in Figure 3, in the first direction X, the battery cell 11 may have a first wall 111 and a second wall 112 relative to each other, wherein the first wall 111 may be connected to the second side plate 23, and the second wall 112 may be connected to the first side plate 22. In order to enable the cooling plate 20 to be deformed by force when the battery cell 11 expands, the stiffness of the first side plate 22 may be less than the stiffness of the second wall 112, and the stiffness of the second side plate 23 may be less than the stiffness of the first wall 111.

[0114] In some embodiments, the cooling plate 20 extends along the second direction Y and is connected to the largest wall of the battery cell 11. Since the expansion of the battery cell 11 primarily occurs on the largest wall, connecting the cooling plate 20 to the largest wall of the battery cell 11 can increase the heat exchange area between the cooling plate 20 and the battery cell 11, enhancing the heat exchange effect, while also fully absorbing the expansion of the battery cell 11, thereby extending the service life of the battery cell 11 and balancing the cooling effect and the service life of the battery pack. Specifically, the first wall 111 can be the largest wall of the battery cell 11, the second wall 112 can also be the largest wall of the battery cell 11, or both the first wall 111 and the second wall 112 can be the largest walls of the battery cell 11.

[0115] 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 gap 12 is provided between two adjacent battery columns 10 along the first direction X. Since the cooling plate 20 is disposed in the gap 12, 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, and the cooling plate 20 has a first side wall 21 facing the battery cell 11 and connected to the battery cell 11. The first side wall 21 is provided with a plurality of recessed portions 211 spaced apart along a third direction Z. When the battery cell 11 expands after operation, the battery cell 11 exerts a force on the first side wall 21. Since the recessed portions 211 are recessed in a direction away from the battery cell 11 in contact with the recessed portions 211, the provision of the recessed portions 211 can make the cooling plate 20 have a tendency to deform in a direction away from the battery cell 11, making it easy to achieve deformation of the cooling plate 20, so that the first side wall 21 connected to the battery cell 11 can deform as the battery cell 11 expands, thereby avoiding the first side wall 21 and the battery cell 11 from abutting against each other, resulting in a large force between the first side wall 21 and the battery cell 11, causing damage to one of them. Compared with the flat cooling plate 20 in the related art, the cooling plate 20 proposed in the embodiment of the present application has a recessed portion 211, which can make the length of the cooling plate 20 at the recessed position longer, so that the cooling plate 20 has a deformation margin when subjected to a force, and can avoid the problem that the cooling plate 20 is pulled by itself and difficult to deform when subjected to the force applied by the battery cell 11. That is, the cooling plate 20 provided in the embodiment of the present application is easy to deform when the battery cell 11 expands, and can adapt to the expansion of the battery cell 11. After the cooling plate 20 is deformed, the contact between the expanded battery cell 11 and the cooling plate 20 can be better, and the cooling effect of the cooling plate 20 on the battery cell 11 is also better.

[0116] In addition, an embodiment of the present application further provides an electric device, which includes a plurality of battery packs 100 according to any one of the above embodiments.

[0117] The electrical equipment includes multiple battery packs 100 described above. Because the cooling plates 20 in the battery packs 100 are provided with recessed portions 211, the cooling plates 20 are susceptible to deformation. When the battery cells 11 expand during operation, the cells 11 compress the cooling plates 20, causing them to deform. This allows the cooling plates 20 to adapt to the expansion of the battery cells 11. Furthermore, the deformation of the cooling plates 20 improves contact between the expanded battery cells 11 and the cooling plates 20, resulting in better cooling of the battery cells 11 by the cooling plates 20.

[0118] In order to make the purpose and beneficial effects of this application clearer, the battery pack 100 provided in the embodiment of this application is tested below to further describe this application.

[0119] Test Example 1-10:

[0120] The battery pack 100 has a first direction X, a second direction Y, and a third direction Z that intersect each other. The battery pack 100 includes 10 battery columns 10 and 9 cooling plates 20. The 10 battery columns 10 are spaced apart along the first direction X. A gap 12 is defined between adjacent battery columns 10 along the first direction X. The cooling plates 20 are disposed in the gap 12 and alternate with the battery columns 10. The battery columns 10 include 11 battery cells 11, which are spaced apart along the second direction Y. The cooling plates 20 have a first side wall 21 facing and connected to the battery cells 11. The first side wall 21 is provided with six recessed portions 211, which are spaced apart along the third direction Z. The recessed portions 211 are recessed away from the battery cells 11 that contact the recessed portions 211.

[0121] In the first direction X, the average thickness of the first side plate 22 or the second side plate 23 is D mm, and the maximum dimension of the cooling plate 20 is H2 mm.

[0122] It should be understood that these embodiments are only used to illustrate the present application and are not intended to limit the scope of the present application. The test parameters include the maximum temperature of the battery pack 100 during the test and the capacity decay of the battery pack 100 after the test. The following test methods can be used:

[0123] Capacity fade rate test method:

[0124] A) At room temperature, the initial capacity was measured according to the method in 6.2 of GB / T31484-2015;

[0125] B) Discharge at 1I1(A) to the discharge termination condition;

[0126] C) Leave it for no less than 30 minutes;

[0127] D) Charge according to method 6.1.1.3 of GB / T31484-2015;

[0128] E) Leave it for no less than 30 minutes;

[0129] F) Discharge to the termination condition of 1I1(A) and record the discharge capacity;

[0130] G) Repeat C) to F) for 1000 cycles;

[0131] H) measuring the room temperature discharge capacity;

[0132] I) Capacity decay rate = (initial capacity - room temperature discharge capacity) / initial capacity.

[0133] Test process maximum temperature test method 1:

[0134] The maximum temperature during the above capacity decay test method is read through the battery pack management system.

[0135] Test process maximum temperature test method 2:

[0136] During the above capacity decay test method, a temperature sensor is arranged on each battery cell of the battery pack to monitor and collect the temperatures of multiple battery cells respectively, and then the highest temperature is selected as the maximum temperature of the test process.

[0137] After testing, the data obtained are shown in the following table:

[0138] According to the above data, it can be seen that when (H2-H1-2D) / (2H2) is smaller, the temperature of the battery pack 100 during charging is lower, but the capacity of the battery pack 100 decays more; when (H2-H1-2D) / (2H2) is larger, the temperature of the battery pack 100 during charging is higher, but the capacity of the battery pack 100 decays less. In the embodiment of the present application, 0<(H2-H1-2D) / (2H2)≤0.3 is set, so that the cooling plate 20 can have a better cooling effect on the battery cells 11 during charging or operation, so that the temperature of the battery pack 100 can be lower than 48.8°C during charging. That is, maintaining 0<(H2-H1-2D) / (2H2)≤0.3 can take into account both the cooling effect and the service life of the battery pack.

[0139] 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.

[0140] 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.

[0141] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity from another, and do not necessarily require or imply any actual relationship or order between these entities. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or terminal device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the article or terminal device comprising the element.

[0142] 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 a first direction, a second direction and a third direction intersecting each other, the battery pack comprises at least two battery columns and at least one cooling plate, the at least two battery columns are spaced apart along the first direction and there is a gap between two adjacent battery columns, the cooling plate is arranged in the gap; The battery column includes a plurality of battery cells, which are distributed along the second direction; the cooling plate is provided with a plurality of recessed parts, which are distributed at intervals along the third direction, and the recessed parts are recessed in a direction away from the battery cells contacting the recessed parts.

2. The battery pack according to claim 1, wherein: In the first direction, the cooling plate has a first side plate and a second side plate opposite to each other, and the first side plate is provided with a recessed portion.

3. The battery pack according to claim 1, wherein: In the first direction, the cooling plate has a first side plate and a second side plate opposite to each other, and the second side plate is provided with the recessed portion.

4. The battery pack according to claim 1, wherein: In the first direction, the cooling plate has a first side plate and a second side plate opposite to each other, and both the first side plate and the second side plate are provided with the recessed portion.

5. The battery pack according to any one of claims 2 to 4, wherein: The cooling plate has an accommodating cavity inside; The accommodating cavity is provided with a first support member, the extension direction of the first support member is obliquely intersected with the extension direction of the first side plate or the second side plate, the first support member has a first end and a second end, the first end of the first support member is connected to the first side plate, the second end of the first support member is connected to the second side plate, the first end of the first support member and the recessed portion on the first side plate are spaced apart along the third direction, and the second end of the first support member and the recessed portion on the second side plate are spaced apart along the third direction. The recessed portions are arranged at intervals along the third direction.

6. The battery pack according to claim 5, wherein: The first support member is connected to the first side plate and has an arc transition.

7. The battery pack according to claim 5, wherein: The first support member is connected to the second side plate and has an arc transition.

8. The battery pack according to claim 5, wherein: The first support member is connected to the first side plate and transitions in a circular arc, and the first support member is connected to the second side plate and transitions in a circular arc.

9. The battery pack according to claim 5, wherein: A second support member is also provided in the accommodating cavity, one end of the second support member is connected to the first side plate, the other end of the second support member is spaced apart from the second side plate in the first direction, and along the first direction on a plane perpendicular to the first direction, the orthographic projection of the second support member falls into the recessed portion on the second side plate.

10. The battery pack according to claim 5, characterized in that: A second support member is also provided in the accommodating cavity, one end of the second support member is connected to the first side plate, the other end of the second support member is spaced apart from the second side plate in the first direction, and along the first direction on a plane perpendicular to the first direction, the orthographic projection of the second support member falls into the recessed portion on the first side plate.

11. The battery pack according to claim 5, wherein: A second support member is also provided in the accommodating cavity, one end of the second support member is connected to the first side panel, the other end of the second support member is spaced apart from the second side panel in the first direction, and along the first direction on a plane perpendicular to the first direction, the orthographic projection of the second support member falls into the recessed portion on the second side panel and the recessed portion on the first side panel.

12. The battery pack according to any one of claims 9 to 11, wherein: In the third direction, the first support member and the second support member are arranged at an interval.

13. The battery pack according to any one of claims 2 to 4, wherein: A connecting portion is provided between two adjacent recessed portions, the connecting portion is connected to both adjacent recessed portions, and there is an arc transition between the connecting portion and the recessed portions.

14. The battery pack according to claim 13, wherein: The cooling plate has an accommodating cavity inside, the first side plate and the second side plate are both provided with the recessed portion, the first side plate has a first surface located inside the accommodating cavity, a protrusion opposite to the recessed portion in the first direction is provided on the first surface, the connecting portion has a second surface located inside the accommodating cavity, and the protrusion protrudes and extends from the plane of the second surface toward the second side plate.

15. The battery pack according to claim 14, wherein: In the first direction, the average thickness of the first side plate or the second side plate is D mm, the maximum size of the cooling plate is H2 mm, and the minimum size of the accommodating cavity is H1 mm, satisfying: 0<(H2-H1-2D) / (2H2)≤0.

3.

16. The battery pack according to claim 15, wherein: The battery pack satisfies: 0.05<(H2-H1-2D) / (2H2)≤0.

16.

17. The battery pack according to claim 15, wherein: The battery pack meets at least one of the following conditions: I) 0.4≤D≤1; II) 0.6≤H1≤4; III)3≤H2≤8.

18. The battery pack according to any one of claims 2 to 4, wherein: Along the first direction and on a plane perpendicular to the first direction, an orthographic projection of the recessed portion on the first side panel and an orthographic projection of the recessed portion on the second side panel have at least a partial overlap.

19. The battery pack according to claim 1, wherein: The cooling plate extends along the second direction and is connected to a largest wall of the battery cell.

20. An electrical device, wherein: The electrical equipment comprises the battery pack described in any one of claims 1-19.

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