Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, the battery pack has a first direction, a second direction and a third direction which are intersected, 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, a gap is formed between the two adjacent battery columns, and the cooling plate is arranged in the gap; the battery column comprises a plurality of single batteries which are distributed along a second direction; the cooling plate is provided with a plurality of sunken parts, the plurality of sunken parts are distributed at intervals along a third direction, and the sunken parts are sunken along a direction deviating from the battery monomers in contact with the sunken parts.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cores, and in particular to a battery pack and electrical equipment. Background Art

[0002] Nowadays, battery packs are used more and more widely, not only in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also in electric vehicles, aerospace and other fields. With the continuous expansion of the application field of battery packs, the market demand is also constantly expanding.

[0003] In the related art, in order to prevent the heat generated by the battery cell from affecting the performance and service life of the battery cell, a cooling plate for cooling the battery cell is usually provided in the battery pack, and the cooling plate is connected to the surface with a larger surface area in the battery cell. When the battery cell generates heat during operation, the plate can exchange heat with the battery cell through the surface to cool the battery pack. However, due to the limitations of the battery cell mechanism and manufacturing process, the battery cell will inevitably expand after long-term use, and the cooling plate connected to the battery cell has poor deformation ability. On the one hand, the cooling plate cannot provide enough expansion space for the battery cell, which easily causes the cooling plate or the battery cell to be compressed, deformed or damaged, and even causes the cooling plate or the battery cell to fail to work normally. On the other hand, after the battery cell expands, the cooling plate has less effective contact with the battery cell, making it difficult for the cooling plate to cool the battery cell, thereby reducing its cooling effect on the battery pack. Therefore, the cooling plate proposed in the related art cannot adapt to the expansion of the battery cell, cannot provide enough expansion space for the battery cell, and has poor cooling effect on the battery cell after the battery cell expands. Utility Model Content

[0004] The embodiments of the utility model provide a battery pack and an electrical device 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 a poor cooling effect on the battery cells after the battery cells expand.

[0005] In order to solve the above technical problems, the utility model is achieved as follows:

[0006] In a first aspect, an embodiment of the utility model provides a battery pack, the battery pack having a first direction, a second direction and a third 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 and having a gap between two adjacent battery columns, the cooling plate being arranged in the gap;

[0007] 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.

[0008] 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 and / or the second side plate is provided with the first side wall.

[0009] Optionally, the cooling plate has an accommodating cavity inside;

[0010] A first support member is arranged 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, 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.

[0011] Optionally, the first support member is connected to the first side panel and transitions in a circular arc, and / or the first support member is connected to the second side panel and transitions in a circular arc.

[0012] 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 projection of the second support member falls into the recessed portion of the second side panel and / or the first side panel.

[0013] Optionally, in the third direction, the first support member and the second support member are arranged at an interval.

[0014] 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.

[0015] 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, and 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.

[0016] 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.

[0017] Optionally, the battery pack satisfies: 0.05<(H2-H1-2D) / (2H2)≤0.16.

[0018] Optionally, the battery pack meets at least one of the following conditions:

[0019] I) 0.4≤D≤1;

[0020] II) 0.6≤H1≤4;

[0021] III)3≤H2≤8.

[0022] Optionally, along the first direction on a plane perpendicular to the first direction, a projection of the recessed portion on the first side panel and a projection of the recessed portion on the second side panel have at least partial overlap.

[0023] In a second aspect, an embodiment of the utility model provides an electrical device, wherein the electrical device comprises a plurality of battery packs as described in the first aspect.

[0024] In an embodiment of the utility model, a battery pack includes at least two battery columns and at least one cooling plate, at least two battery columns are spaced apart along a first direction, and there is a gap between two adjacent battery columns along the first direction. Since the cooling plate is arranged in the gap, the cooling plate can exchange heat with the battery columns on both sides thereof, thereby cooling the battery column. The battery column includes a plurality of battery cells distributed along a second direction, the cooling plate has a first side wall facing the battery cells and connected to the battery cells, and a plurality of recessed portions spaced apart along a third direction are arranged on the first side wall. When the battery cells expand after operation, the battery cells exert a force on the first side wall. Since the recessed portions are recessed in a direction away from the battery cells in contact with the recessed portions, the arrangement of the recessed portions can make the cooling plate have a tendency to deform in a direction away from the battery cells, and the deformation of the cooling plate can be easily realized, so that the first side wall connected to the battery cells can be deformed with the expansion of the battery cells, and the first side wall and the battery cells can be prevented from abutting against each other, resulting in a large force between the first side wall and the battery cells, so that the problem of damage to one of them occurs. Compared with the flat cooling plate in the related art, the cooling plate proposed in the embodiment of the utility model 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 utility model 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 An exploded view of a battery pack provided by an embodiment of the utility model is shown;

[0026] Figure 2 A schematic diagram showing the connection between a battery array and a cooling plate provided by an embodiment of the utility model;

[0027] Figure 3 express Figure 2 Cross-section at AA in the middle;

[0028] Figure 4 A schematic diagram showing a plurality of cold plates provided by an embodiment of the utility model;

[0029] Figure 5 express Figure 4 Cross-section at the middle BB;

[0030] Figure 6 express Figure 5 A partial enlarged view of point C in the middle;

[0031] Figure 7 A partial schematic diagram showing a first side panel provided by an embodiment of the utility model;

[0032] Figure 8 A partial schematic diagram showing a second side panel provided by an embodiment of the utility model;

[0033] Fig. 9 A schematic diagram showing a cooling plate provided by an embodiment of the utility model;

[0034] Fig.10 A schematic diagram showing the connection between a cooling plate and a battery cell provided by an embodiment of the utility model;

[0035] Fig.11 A partial schematic diagram of a cooling plate provided in an embodiment of the utility model is shown.

[0036] Reference numerals:

[0037] 100: battery pack; 10: battery array; 20: cooling plate; 11: battery cell; 12: gap; 21: first side wall; 211: recessed portion; 22: first side plate; 23: second side plate; 24: first wall plate; 25: second wall plate; 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 point; 312: second connection point; 224: third connection point; 313: first end; 314: second end; 2111: first surface; 2112: protrusion; 2113: second surface; X: first direction; Y: second direction; Z: third direction. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0040] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, 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, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" 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 the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0041] like Figures 1 to 10 As shown, the 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. There is a gap 12 between two adjacent battery columns 10 along the first direction X, and the cooling plate 20 is disposed in the gap 12. The battery column 10 includes a plurality of battery cells 11, and the plurality of battery cells 11 are distributed along the second direction Y. The cooling plate 20 is provided with a plurality of recessed portions 211, and the plurality of recessed portions 211 are spaced apart along the third direction Z, and the recessed portions 211 are recessed in a direction away from the battery cells 11 contacting the recessed portions 211. Specifically, the cooling plate 20 has a first side wall 21 facing the battery cells 11 and connected to the battery cells 11, and the recessed portions 211 are disposed on the first side wall 21.

[0042] In an embodiment of the utility model, a battery pack 100 includes at least two battery columns 10 and at least one cooling plate 20. At least two battery columns 10 are spaced apart along a first direction X, and there is a gap 12 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 column 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, and a plurality of recessed portions 211 are provided on the first side wall 21 and distributed at intervals 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 portion 211 is recessed in a direction away from the battery cell 11 in contact with the recessed portion 211, the provision of the recessed portion 211 can make the cooling plate 20 have a tendency to deform in a direction away from the battery cell 11, and the deformation of the cooling plate 20 can be easily achieved, so that the first side wall 21 connected to the battery cell 11 can be deformed as the battery cell 11 expands, and the first side wall 21 and the battery cell 11 can be prevented from abutting against each other, resulting in a large force between the first side wall 21 and the battery cell 11, causing one of them to be damaged. Compared with the straight cooling plate 20 in the related art, the cooling plate 20 proposed in the embodiment of the utility model 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 utility model is easy to deform when the battery cell 11 expands, and can adapt to the expansion of the battery cell 11, and 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.

[0043] That is, the cooling plate 20 in the battery pack 100 provided in the embodiment of the utility model can be deformed as the battery cell 11 expands, and can provide a suitable expansion space for the battery cell 11, so as to prevent the cooling plate 20 from inhibiting the expansion of the battery cell 11, and can prevent the battery cell 11 from increasing the risk of 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 the life of the battery cell 11.

[0044] It should be noted that the battery pack 100 has an intersecting first direction X, a second direction Y, and a third direction Z. The first direction X is the distribution direction of the multiple battery columns 10, and the second direction Y is the distribution direction of the multiple battery cells 11 in one battery column 10. There may be an angle between the first direction X and the second direction Y. Specifically, the first direction X and the second direction Y are perpendicular to each other. At this time, the multiple battery cells 11 may be arranged regularly to facilitate the arrangement of the cooling unit. Of course, the angle may also be other values, for example, 76°, 80°, 95°, etc. The specific value of the angle between the first direction X and the second direction Y is not specifically limited in the embodiment of the utility model. The battery pack 100 may also have a box body 102, and the multiple battery cells 11 are all arranged in the box body 102 and are in contact with the bottom plate of the box body 102. The bottom plate carries the multiple battery cells 11, such as Figure 1 As shown, the first direction X and the second direction Y may both be parallel to the bottom plate.

[0045] The third direction Z intersects with 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 of the box 102. The third direction Z may intersect with the bottom plate. The box 102 may also have an upper cover 101. Figure 1 As shown, the upper cover 101 is opposite to the bottom plate, and the box body 102 can be sealed, and the third direction Z can be consistent with the direction from the bottom plate to the upper cover 101. The third direction Z is perpendicular to the bottom plate. Of course, the angle between the third direction Z and the plane where the back bottom plate is located can also be other values, such as 78°, 83°, 85°, 95°, etc. The specific direction of the third direction Z is not specifically limited in the embodiment of the utility model.

[0046] It should also be noted that the number of battery columns 10 is at least two, specifically, the number of battery columns 10 can be 2, 3, 4, 5, 6, etc., each battery column 10 has multiple battery cells 11, and the number of battery cells 11 can be 2, 3, 4, 5, 6, 7, etc. The number of battery columns 10 and the number of battery cells 11 in each battery column 10 are not specifically limited in the embodiment of the utility model, and can be set according to the specifications of the battery pack 100, the capacity of the battery pack 100, and the electrical equipment using the above battery pack 100. Among them, the number of battery cells 11 in each battery column 10 can be the same, or different, and the embodiment of the utility model does not specifically limit it.

[0047] In addition, in the embodiment of the utility model, 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, and the positions where the recessed portions 211 are provided on the first side wall 21 and the positions where the recessed portions 211 are not provided on the first side wall 21 are staggered, wherein the recessed portions 211 can 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 in the second direction Y, the first side wall 21 can be wavy, such as Figure 5 Of course, the first side wall 21 may also be in other shapes. For example, when the number of battery cells 11 in the battery column 10 is 2, one first side plate 22 is connected to two battery cells 11. At this time, the recessed portions 211 in the areas corresponding to the two battery cells 11 may be staggered, as shown in FIG. Fig.10 As shown, E in the figure indicates the area of ​​the cooling plate 20 corresponding to the battery cell 11.

[0048] In addition, in some embodiments, Figure 2 As shown, 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, the first side plate 223 forms the first side wall 21, or the second side plate 23 forms the first side wall 21, or the first side plate 22 and the second side plate 23 both form the first side wall 21. In other words, the recessed portion 21 can be provided on the first side plate 22, can also be provided on the second side plate 23, and can also be provided on both the first side plate 22 and the second side plate 23.

[0049] 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. Since the first side plate 22 and the second side plate 23 are opposite 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, so that they can be connected to the battery cells 11 in the two adjacent battery columns 10. In some embodiments, the first side plate 22 can form the first side wall 21, or the second side plate 23 can form the first side wall 21, so that the recessed portion 211 can be provided on the first side plate 22 or the second side plate 23, so that the battery cells 11 connected to the first side plate 22 or the second side plate 23 can be cooled, and the first side plate 22 and the second side plate 23 can be deformed according to the expansion of the battery cells 11.

[0050] In the case where the recessed portion 211 is disposed on the first side plate 22, the recessed portion 211 can be connected to the battery cells 11 in the battery column 10 that the first side plate 22 faces, providing expansion space for the battery cells 11, and maintaining good contact with the battery cells 11 after the battery cells 11 expand during operation, so that the cooling effect of the battery cells 11 of the cooling plate 20 is better. In the case where the recessed portion 211 is disposed on the second side plate 23, the recessed portion 211 can be connected to the battery cells 11 in the battery column 10 that the second side plate 23 faces, providing expansion space for the battery cells 11, and maintaining good contact with the battery cells 11 after the battery cells 11 expand during operation, so that the cooling effect of the battery cells 11 of the cooling plate 20 is better. When the recessed portion 211 is arranged 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 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.

[0051] 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.

[0052] In other embodiments, the first side plate 22 and the second side plate 23 may both form the first side wall 21, which may be understood as a plurality of first side walls 21, one of which is formed on the first side plate 22, and another of which is formed on the second side plate 23. In this case, both sides of the cooling plate 20 can achieve the effect of absorbing the expansion of the battery cell 11.

[0053] In addition, in some embodiments, Figure 4 , Figure 5 , Figure 6 As shown, the cooling plate 20 has an accommodating cavity 201 inside; a first support member 31 is arranged 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, 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.

[0054] 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 directions 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. Since the first end 313 of the first support member 31 and the recessed portion 211 on the first side plate 22 are spaced apart 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 staggered 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, so that the first support member 31 can be prevented from hindering the deformation of the recessed portion 211, so that the first side plate 22 or the second side plate 23 can have a corresponding deformation space. Specifically, the extension direction of the first side plate 22 or the second side plate 23 can be understood as the overall length extension direction of the first side plate 22 or the second side plate 23.

[0055] Among them, 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 can also be arranged at intervals, 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 different positions of the cooling plate 20 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 make the cooling plate 20 have a deformation tendency, and avoid the problem that when the first support member 31 is in a straight shape (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), when the first side plate 22 and the second side plate 23 are subjected to force, the force received by the first support member 31 is along its extension direction, and the supporting effect on the first side plate 22 and the second side plate 23 is stronger, thereby preventing the deformation of the first side plate 22 and the second side plate 23.

[0056] In the embodiment of the utility model, the first support member 31 is tilted, and a first preset angle α may be formed between the first support member 31 and the first reference plane. Figure 7As shown, the first preset angle α satisfies: 0<α≤45°, so that the first support member 31 can be tilted in the accommodating cavity 201 to facilitate the deformation of the cooling plate 20. Specifically, α can be 15°, 20°, 35°, 38°, 40°, 45°, etc. The specific angle value of the first preset angle α is not specifically limited in the embodiment of the utility model. When the first preset angle α is small, when the first support member 31 is set 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 setting of the first support member 31, and the number of first support members 31 that can be set in the accommodating cavity 201 is small. In order to facilitate the setting of the first support member 31, the first preset angle α satisfies: 20°≤α≤45°. Correspondingly, there can be a second preset angle β between the first support member 31 and the second reference plane, such as Figure 8 As shown, the second preset angle β satisfies: 0<β≤45°.

[0057] The first reference plane may be a plane formed by a portion of the first side plate 22 where the recessed portion 211 is not provided, and the second reference plane may be a plane formed by a portion of the second side plate 23 where the recessed portion 211 is not provided. The following is an explanation of the measurement process of the first preset angle α. In actual testing, a plane may be set first, and the first side plate 22 may be placed on the plane so that the position of the first side plate 22 where the recessed portion 211 is not provided abuts against the plane, and the position of the first support member 31 is recorded. The angle between the first support member 31 and the plane is measured as the preset angle α.

[0058] It should be noted that if Figure 5 As shown, the cooling plate 20 may further include a first wall plate 24 and a second wall plate 25, 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 through an arc structure, and the second side plate 23 may be connected to the first wall plate 24 and the second side plate 23 through an arc structure, so that the first side plate 22 and the first wall plate 24 and the second wall plate 25 have an arc transition, and the second side plate 23 and the first wall plate 24 and the second wall plate 25 have an arc transition, which can reduce stress concentration and avoid the problem that the cooling plate 20 is easily damaged under the force of the battery cell 11 when the battery cell 11 expands.

[0059] 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, such as Figure 5As shown, 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 can 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 multiple first support members 31, which is beneficial for the first side plate 22 and the second side plate 23 to deform inwardly due to the expansion of the battery cell 11.

[0060] In addition, the specific positional relationship between the first support member 31 and the recessed portion 211 can have various types. For example, the connection position between the first support member 31 and the first side plate 22 can be staggered with the recessed portion 211 on the first support member 31, and the connection position between the first support member 31 and the second side plate 23 can be staggered 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. Figure 5 The first support member 31 has a good supporting effect on the first side plate 22 and the second side plate 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 plate 22 can also be arranged alternately 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 plate 23 can also be arranged alternately with the recessed portion 211 on the second side plate 23, that is, there can be multiple recessed portions 211 on the first side plate 22 between two adjacent first support members 31, and the two adjacent first support members 31 can be arranged alternately with the recessed portion 211 on the second side plate 23. There may be a plurality of recessed portions 211 between the support members 31 on the second side plate 23; alternatively, after the first support member 31 is connected to the accommodating cavity 201, there may not be a recessed portion 211 between two adjacent first support members 31, that is, no recessed portion 211 is provided between the first ends 313 of two adjacent first support members 31, and no recessed portion 211 is provided between the second ends 314 of 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 utility model.

[0061] In addition, in some embodiments, Figure 6 As shown, the first support member 31 is connected to the first side plate 22 and has an arc transition, and / or the first support member 31 is connected to the second side plate 23 and has an arc transition;

[0062] In other embodiments, the first support member 31 is connected to the second side plate 23 and has an arc transition. Alternatively, the first support member 31 and the first side plate 22 and the second side plate 23 are all connected to each other and have an arc transition.

[0063] Specifically, the first support member 31 is connected to the second side panel 23 and forms a second connection 312 at the 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 the acute angle between the two, and the first connection 311 is a first arc structure.

[0064] Thus, 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.

[0065] In addition, in some embodiments, Figure 3 , Figure 5 , Figure 6 As shown, 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 plate 22, and the other end of the second support member 33 is spaced apart from the second side plate 23 in the first direction X, and along the first direction X on a plane perpendicular to the first direction X, the projection of the second support member 33 falls into the recessed portion 211 of the first side plate 22 or the second side plate 23.

[0066] In some other embodiments, along the first direction X on a plane perpendicular to the first direction X, the 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 .

[0067] It can be understood that the second support member 33 is disposed opposite to the recessed portion 211 on the first side plate 22 or the second side plate 23 .

[0068] Or it can also be understood that the second support member 33 is arranged opposite to the recessed portions 211 on the first side plate 22 and the second side plate 23 .

[0069] 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. Since the other end of the second support member 33 is spaced from the second side plate 23 in the first direction X, there is a distance 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, so that the first side plate 22 and the second side plate 23 are close to each other, so that the other end of the second support member 33 can be close to the second side plate 23, so that the distance between the other end of the second support member 33 and the second side plate 23 is reduced. As the expansion of the battery cell 11 increases, the force of the battery cell 11 on the cooling plate 20 will also increase, which will increase the degree of depression of the recessed portion 211. The provision of the second support member 33 can prevent the battery cell 11 from excessively pressing the cooling plate 20, and prevent the first side plate 22 and the second side plate 23 from being attached under the action of the battery cell 11, resulting in the problem of clogging of the accommodating cavity 201. 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 201. Blockage of the accommodating cavity 201 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.

[0070] Since the second support member 33 is opposite to the recessed portion 211, when the battery cell 11 expands, the second support member 33 can move in a larger range with the compression of the cooling plate 20, so that the cooling plate 20 can be compressed more, so that it can better adapt to the expansion of the battery cell 11, and it can avoid that when the second support member 33 is opposite to the position where the recessed portion 211 is not set, when the battery cell 11 expands less, the second support member 33 abuts against the second side plate 23, so that the cooling plate 20 cannot be further compressed. In order to allow the cooling plate 20 to be compressed after the battery cell 11 expands, so that the second support member 33 can move relative to the second side plate 23, the distance between the recessed portion 211 opposite to the second support member 33 and the other end of the second support member 33 is set to be greater than the preset distance, and the preset 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.

[0071] It should be noted that, in addition to the above-mentioned second support member 33 being connected to the first side plate 22, the second support member 33 may also be connected to the cooling plate 20 in other ways, which may also prevent the battery cell 11 from over-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. Fig. 9 , which is a schematic diagram showing that after the cooling plate 20 is deformed in the embodiment of the utility model, 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 .

[0072] It should also be noted that the second support member 33 can extend along the first direction X, and the angle with the position where the recessed portion 211 is not provided on the first side plate 22 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 exerted on 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 large force, thereby avoiding the problem of the second support member 33 being tilted and easily broken due to force.

[0073] In addition, in some embodiments, Figure 6 As shown, in the third direction Z, the first support member 31 and the second support member 33 may be arranged at an interval.

[0074] In the embodiment of the utility model, 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 avoid the problem of the second support member 33 interfering with the deformation of the first support member 31.

[0075] In addition, in some embodiments, Figure 5 , Figure 6 As shown, 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 a third connection 224 is formed at the connecting portion of the two, and the third connection 224 is a third arc structure.

[0076] A connecting portion 223 is provided between two adjacent recessed portions 211, and the connecting portion 223 is connected to the recessed portion 211 to form a third connection, wherein the third connection may also be an arc transition, so that an arc transition is provided between a position on the first side wall 21 where the recessed portion 211 is provided and a position where the recessed portion 211 is not provided, thereby avoiding sharp corners on the first wall panel 24, thereby reducing stress concentration and avoiding deformation of the cooling plate 20 after being acted upon by the battery cell 11, which causes the first wall panel 24 to be easily damaged.

[0077] In addition, in some embodiments, Figure 6As shown, 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, the first side plate 22 has a first surface 2111 located inside the accommodating cavity 201, and the first surface 2111 is provided with a protrusion 2112 opposite to the recessed portion 211 in the first direction X, 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 where the second surface 2113 is located toward the second side plate 23.

[0078] The cooling plate 20 has an accommodating cavity 201 inside, and the first side wall 21 has a first surface 2111 located inside the accommodating cavity 201, wherein a protruding portion 2112 opposite to the recessed portion 211 is provided on the first surface 2111, and the connecting portion 223 has a second surface 2113 located inside the accommodating cavity 201. Since both the first side plate 22 and the second side plate 23 can form the first side wall 21, and the protruding portion 2112 protrudes and extends from the plane where the second surface 2113 is located toward the other first side wall 21, therefore, when the protruding portion 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; when the protruding portion 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, so that the strength of the connecting portion 223 can be greater.

[0079] In addition, in some embodiments, Fig.11 As shown, 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 size of the cooling plate 20 is H2 mm, and the minimum size of the accommodating cavity 201 is H1 mm, satisfying: 0<(H2-H1-2D) / (2H2)≤0.3.

[0080] 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 surface of the connecting portion 223 on the first side plate 22 and the outer surface of the connecting portion 223 on the second side plate 23, and the minimum dimension of the accommodating cavity 201 is the distance between the inner surface of the recessed portion 221 on the first side plate 22 and the inner surface of the recessed portion 211 on the second side plate 23. D, H2, and H1 satisfy: 0<(H2-H1-2D) / (2H2)≤0.3, so that the cooling plate 20 can have a better cooling effect on the battery cell 11 during the charging and discharging process, and at the same time can effectively absorb the expansion of the battery cell 11, thereby extending the service life of the battery pack.

[0081] 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 the embodiments of the present invention.

[0082] In some embodiments, the average thickness of the first side plate 22 or the second side plate 23 satisfies: 0.4≤D≤1.

[0083] In some embodiments, the minimum size of the accommodating cavity 201 satisfies 0.6≤H1≤4.

[0084] In some embodiments, the maximum size of the cooling plate 20 satisfies 4≤H2≤8.

[0085] In some other embodiments, the following conditions are satisfied simultaneously: 0.4≤D≤1, 0.6≤H1≤4, 4≤H2≤8.

[0086] It should be noted that the average thickness of the first side plate 22 or the second side plate 23 is D mm, and a vernier caliper can be used to measure the average thickness of the first side wall 21 where the recessed portion 211 is set and the average thickness of the first side wall 21 where the recessed portion 211 is not set, and at least three average values ​​are measured and then averaged to obtain the average thickness of the first side plate 22 or the second side plate 23. When a protrusion 2112 is provided on the first surface 2111 of the first side wall 21, which is opposite to the recessed portion 211 in the first direction X, and the protrusion 2112 protrudes and extends from the plane where the second surface 2113 is located toward the direction of the other first side wall 21, the inner surface of the position where the recessed portion 211 is set on the first side wall 21 and the outer surface have the same shape, and at this time, the thickness of each part of the recessed portion 211 can be consistent, and the average size of the first side wall 21 is the thickness of any one part on the first side wall 21.

[0087] 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 three 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.

[0088] 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 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 square to make an auxiliary surface perpendicular to the plane, and then use another ruler or a square 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 is recorded as the first datum, repeat the above steps for the second side plate, find the second datum on the second side plate 23, measure the distance between the first datum and the second datum at least 3 times and take the average value to obtain the minimum size of the accommodating cavity 201.

[0089] In addition, in some embodiments, the battery pack 100 may be configured to satisfy 0.05<(H2-H1-2D) / (2H2)≤0.16, so as to 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.

[0090] 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 invention.

[0091] In some embodiments, the battery pack 100 satisfies at least one of the following conditions:

[0092] I)0.4≤D≤1

[0093] II)0.6≤H1≤4

[0094] III)3≤H2≤8.

[0095] 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.

[0096] In addition, in some embodiments, along the first direction X on a plane perpendicular to the first direction X, a projection of the recessed portion 211 on the first side plate 22 and a projection of the recessed portion 211 on the second side plate 23 have at least a partial overlap.

[0097] The 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 the first side plate 22 and the second side plate 23. At this time, the first side plate 22 and the second side plate 23 are both 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.

[0098] In addition, in some embodiments, the projection of the recessed portion 211 on the first side plate 22 and the projection of the recessed portion 211 on the second side plate 23 may not overlap at all. In this case, 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 opposite to 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 expansion amount.

[0099] In addition, in some embodiments, in the first direction X, the battery cell 11 may have a relative first wall and a second wall, wherein the first wall may be connected to the second side plate 23, and the second wall may be connected to the first side plate 22. In order to allow 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 smaller than the stiffness of the second wall, and the stiffness of the second side plate 23 may be smaller than the stiffness of the first wall.

[0100] 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 mainly occurs on the largest wall, the cooling plate 20 is connected to the largest wall of the battery cell 11. This can increase the heat exchange area between the cooling plate 20 and the battery cell 11, enhance the heat exchange effect, and fully absorb the expansion of the battery cell 11, thereby extending the service life of the battery cell 11, taking into account both the cooling effect and the service life of the battery pack. The first wall can be the wall with the largest area of ​​the battery cell 11, the second wall can also be the wall with the largest area of ​​the battery cell 11, or both the first wall and the second wall are the walls with the largest area of ​​the battery cell 11.

[0101] In an embodiment of the utility model, a battery pack 100 includes at least two battery columns 10 and at least one cooling plate 20. At least two battery columns 10 are spaced apart along a first direction X, and there is a gap 12 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 column 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, and a plurality of recessed portions 211 are provided on the first side wall 21 and distributed at intervals 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 portion 211 is recessed in a direction away from the battery cell 11 in contact with the recessed portion 211, the provision of the recessed portion 211 can make the cooling plate 20 have a tendency to deform in a direction away from the battery cell 11, and the deformation of the cooling plate 20 can be easily achieved, so that the first side wall 21 connected to the battery cell 11 can be deformed as the battery cell 11 expands, and the first side wall 21 and the battery cell 11 can be prevented from abutting against each other, resulting in a large force between the first side wall 21 and the battery cell 11, causing one of them to be damaged. Compared with the straight cooling plate 20 in the related art, the cooling plate 20 proposed in the embodiment of the utility model 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 utility model is easy to deform when the battery cell 11 expands, and can adapt to the expansion of the battery cell 11, and 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.

[0102] In addition, an embodiment of the utility model further provides an electric device, which includes a plurality of battery packs 100 in any one of the above embodiments.

[0103] The electric device includes a plurality of the above-mentioned battery packs 100. Since the cooling plate 20 in the battery pack 100 is provided with a recessed portion 211, the cooling plate 20 is easily deformed. When the battery cell 11 expands during operation, the battery cell 11 can compress the cooling plate 20 to deform the cooling plate 20, so that the cooling plate 20 can adapt to the expansion of the battery cell 11. After the cooling plate 20 is deformed, the expanded battery cell 11 can be in better contact with the cooling plate 20, and the cooling effect of the cooling plate 20 on the battery cell 11 is also better.

[0104] In order to make the purpose and beneficial effects of the present invention clearer, the battery pack 100 provided in the embodiment of the present invention is tested below to further describe the present invention.

[0105] Test example 1-10:

[0106] 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. There is a gap 12 between two adjacent battery columns 10 along the first direction X. The cooling plates 20 are disposed in the gap 12. The cooling plates 20 and the battery columns 10 are alternately disposed. The battery columns 10 include 11 battery cells 11. The 11 battery cells 11 are distributed along the second direction Y. 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 6 recessed portions 211. The 6 recessed portions 211 are spaced apart along the third direction Z. The recessed portions 211 are recessed in a direction away from the battery cell 11 in contact with the recessed portions 211.

[0107] 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.

[0108] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. 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 method can be used for testing:

[0109] Capacity decay rate test method:

[0110] A) At room temperature, the initial capacity is measured according to the method in 6.2 of GB / T31484-2015;

[0111] B) Discharge at 1I1(A) to the discharge termination condition;

[0112] C) Leave it for no less than 30 minutes;

[0113] D) Charge according to method 6.1.1.3 of GB / T31484-2015;

[0114] E) Leave it for no less than 30 minutes;

[0115] F) Take 1I1(A) as the discharge termination condition and record the discharge capacity;

[0116] G) Repeat C) to F) for 1000 times;

[0117] H) measuring the room temperature discharge capacity;

[0118] I) Capacity decay rate = (initial capacity - room temperature discharge capacity) / initial capacity.

[0119] Test process maximum temperature test method 1:

[0120] The maximum temperature of the above capacity decay test method process is read through the battery pack management system.

[0121] Test process maximum temperature test method 2:

[0122] In the process of 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 highest temperature of the test process.

[0123] After testing, the data obtained are shown in the following table:

[0124]

[0125]

[0126] According to the above data, it can be known 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 utility model, 0<(H2-H1-2D) / (2H2)≤0.3 is set, so that the cooling plate 20 can have a better cooling effect on the battery cell 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.

[0127] 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 or similar parts between the various embodiments can be referenced to each other.

[0128] Although the optional embodiments of the utility model embodiments have been described, those skilled in the art, once knowing the basic creative concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0129] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0130] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack (100), characterized in that: The battery pack (100) has a first direction (X), a second direction (Y), and a third direction (Z) intersecting each other, the battery pack (100) comprises 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) and there is a gap (12) between two adjacent battery columns (10), and the cooling plate (20) is arranged in the gap (12); The battery array (10) comprises a plurality of battery cells (11), wherein the plurality of battery cells (11) are distributed along a second direction (Y); the cooling plate (20) is provided with a plurality of recessed portions (211), wherein the plurality of recessed portions (211) are distributed at intervals along the third direction (Z), and the recessed portions (211) are recessed in a direction away from the battery cells (11) in contact with the recessed portions (211).

2. The battery pack (100) according to claim 1, characterized in that: 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) and / or the second side plate (23) are provided with the recessed portion (211).

3. The battery pack (100) according to claim 2, characterized in that: The cooling plate (20) has an accommodating cavity (201) inside; A first support member (31) is arranged in the accommodating cavity (201); an extension direction of the first support member (31) is obliquely intersected with an extension direction of the first side plate (22) or the second side plate (23); 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); 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 arranged at intervals 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 arranged at intervals along the third direction (Z).

4. The battery pack (100) according to claim 3, characterized in that: The first support member (31) is connected to the first side plate (22) and forms an arc transition, and / or the first support member (31) is connected to the second side plate (23) and forms an arc transition.

5. The battery pack (100) according to claim 3, characterized in that: 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), the other end of the second support member (33) is spaced apart from the second side plate (23) in the first direction (X), and along the first direction (X) on a plane perpendicular to the first direction (X), the projection of the second support member (33) falls into the recessed portion on the second side plate (23) and / or the first side plate (22).

6. The battery pack (100) according to claim 5, characterized in that: In the third direction (Z), the first support member (31) and the second support member (33) are arranged at an interval.

7. The battery pack (100) according to claim 2, characterized in that: A connecting portion (223) is provided between two adjacent recessed portions (211), the connecting portion (223) is connected to both adjacent recessed portions (211), and a circular arc transition is formed between the connecting portion (223) and the recessed portions (211).

8. The battery pack (100) according to claim 7, characterized in that: The cooling plate (20) has an accommodating cavity (201) inside, the first side plate (22) and the second side plate (23) are both provided with the recessed portion (211), the first side plate (22) has a first surface (2111) located inside the accommodating cavity (201), the first surface (2111) is provided with a protruding portion (2112) opposite to the recessed portion (211) in the first direction (X), the connecting portion (223) has a second surface (2113) located inside the accommodating cavity (201), and the protruding portion (2112) protrudes and extends from the plane where the second surface (2113) is located toward the second side plate (23).

9. The battery pack (100) according to claim 8, characterized in that: 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 size of the cooling plate (20) is H2 mm, and the minimum size of the accommodating cavity (201) is H1 mm, satisfying: 0<(H2-H1-2D) / (2H2)≤0.

3.

10. The battery pack (100) according to claim 9, characterized in that: The battery pack (100) satisfies: 0.05<(H2-H1-2D) / (2H2)≤0.

16.

11. The battery pack (100) according to claim 9, characterized in that: The battery pack (100) satisfies at least one of the following conditions: I) 0.4≤D≤1; II) 0.6≤H1≤4; III)3≤H2≤8.

12. The battery pack (100) according to claim 2, characterized in that: Along the first direction (X) and on a plane perpendicular to the first direction (X), a projection of the recessed portion (211) on the first side plate (22) and a projection of the recessed portion (211) on the second side plate (23) have at least partial overlap.

13. The battery pack (100) according to claim 1, characterized in that: The cooling plate (20) extends along the second direction (Y) and is connected to the largest wall of the battery cell (11).

14. An electrical device, characterized in that: The electrical equipment comprises the battery pack (100) as claimed in any one of claims 1 to 13.

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