Battery pack and powered device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a battery cell assembly and a heat exchange assembly. The battery cell assembly comprises a plurality of battery cells. A side surface of the battery cell, on which an output pole of the battery cell is located, comprises a functional area and a non-functional area. The functional area is provided with at least one of the output pole, a liquid injection hole and an explosion-proof valve. The heat exchange assembly comprises a first heat exchange component and a first support. The first heat exchange component is arranged on the side of the battery cell, on which the output pole is located. One side of the first support abuts against an adjacent first heat exchange component. The other side of the first support abuts against the non-functional area of an adjacent battery cell. The battery pack of the application can improve the technical problem that the first heat exchange component is easy to damage the battery cell by arranging the support.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack and an electric device. BACKGROUND

[0002] The battery pack mainly comprises a box body and battery cells packaged in the box body.

[0003] In the related art, a liquid cooling plate is further arranged in the box body and attached to the upper side of the battery cells to dissipate heat from the battery cells. However, when the battery pack vibrates, the liquid cooling plate is likely to impact the battery cells, causing the functional structures such as the output poles on the surface of the battery cells to be crushed by the liquid cooling plate. SUMMARY

[0004] Embodiments of the present application provide a battery pack and an electric device, which can improve the technical problem that the structure of the functional area of the battery cells of the battery pack is easily crushed by the first heat exchange component.

[0005] In a first aspect, embodiments of the present application provide a battery pack, comprising:

[0006] a battery cell assembly comprising a plurality of battery cells, a side surface of the battery cells on which an output pole is located comprising a functional area and a non-functional area, the functional area being provided with at least one of the output pole, a liquid injection hole and an explosion-proof valve; and

[0007] a heat exchange assembly comprising a first heat exchange component and a first support, the first heat exchange component being arranged on the side of the battery cells on which the output pole is located, one side of the first support abutting against adjacent first heat exchange components, and the other side of the first support abutting against the non-functional area of adjacent battery cells.

[0008] In some embodiments, the battery cell assembly comprises at least two rows of battery cells, and the first support overlaps with the two adjacent rows of battery cells.

[0009] In some embodiments, each side of the first support in the width direction overlaps with one row of battery cells.

[0010] In the width direction of the first support, the width of the portion of the first support overlapping with each row of battery cells is greater than or equal to 3 mm.

[0011] In some embodiments, the number of battery cell assemblies is at least two, and all the battery cell assemblies are arranged in the vertical direction.

[0012] The heat exchange assembly further comprises a second support, which is located between the first heat exchange component and the battery cell assembly at the top.

[0013] In some embodiments, the heat exchange assembly further comprises at least two second heat exchange components, each of the second heat exchange components is arranged on a side of each of the battery cell assemblies away from the first heat exchange component to exchange heat;

[0014] The second support is clamped between the adjacent first heat exchange component and the second heat exchange component.

[0015] In some embodiments, the structural strength of the second heat exchange component is greater than that of the first heat exchange component.

[0016] In some embodiments, the first heat exchange component comprises a stamping plate forming a flow channel for the cooling medium to flow through;

[0017] The second heat exchange component comprises an extruded plate, and a flow channel for the cooling medium to flow through is formed in the extruded plate.

[0018] In some embodiments, the thickness of the second heat exchange component is greater than that of the first heat exchange component.

[0019] In some embodiments, the first support and / or the second support abuts a non-flow channel region of the adjacent first heat exchange component.

[0020] In some embodiments, the second support comprises a first buffer layer abutting the second heat exchange component.

[0021] In some embodiments, along the vertical direction, the height of the second support protruding from the connected first heat exchange component is greater than or equal to 2 mm;

[0022] Along the vertical direction, the gap between two adjacent battery cell assemblies is D1, the height of the second support is D2, and the ratio of D1 to D2 is 13:4 to 13:5; and / or,

[0023] Along the vertical direction, the gap between two adjacent battery cell assemblies is D1, the sum of the height of the two adjacent battery cell assemblies and the gap between the two adjacent battery cell assemblies is D3, and the ratio of D1 to D3 is 3:20 to 1:15; and / or,

[0024] Along the vertical direction, the gap between two adjacent battery cell assemblies is D1, the height of the first support is D4, and the ratio of D1 to D4 is 13:6 to 13:7.

[0025] In some embodiments, the first support and / or the second support is a strip-shaped support.

[0026] In some embodiments, the heat exchange assembly further comprises a third support member penetrating the first heat exchange component to be sandwiched between two adjacent battery cell assemblies.

[0027] In some embodiments, the number of the battery cell assemblies is at least two, and all the battery cell assemblies are arranged along a first direction; each of the battery cell assemblies comprises a plurality of columns of battery cells, the columns of battery cells in the same battery cell assembly are arranged along a second direction, and the battery cells in the same column are arranged along a third direction, the first direction, the second direction and the third direction intersecting with each other.

[0028] In some embodiments, the number of the first support members is a plurality, and at least two of the first support members are arranged along the second direction, and each of the first support members extends along the third direction.

[0029] In some embodiments, there is a first gap between two adjacent columns of battery cells in the same battery cell assembly, and at least one of the first support members is arranged corresponding to at least one of the first gaps along the first direction.

[0030] In some embodiments, the first support member extends along the length direction of the battery cell assembly, and the ratio of the length of the first support member to the length of the battery cell assembly is greater than or equal to three-fifths.

[0031] In some embodiments, the battery pack comprises a plurality of sub-boxes, all the sub-boxes are stacked along a first direction, and each of the sub-boxes is provided with one of the battery cell assemblies.

[0032] In some embodiments, the battery cell assembly further comprises a busbar, and the battery cells are electrically connected to the busbar.

[0033] In some embodiments, the first heat exchange component is connected to the pole of the adjacent battery cell assembly or the busbar through a heat-conducting adhesive.

[0034] In a second aspect, embodiments of the present application provide a use electric device comprising the battery pack according to any one of the above.

[0035] The beneficial effects of embodiments of the present application are as follows:

[0036] In embodiments of the present application, when the battery pack vibrates, at least part of the impact force of the first heat exchange component can be transmitted to the non-functional area of the battery cell through the first support member, so as to avoid the whole impact force of the first heat exchange component directly acting on the functional area of the battery cell, and finally the technical problem that the structure at the functional area of the battery cell is easily crushed by the first heat exchange component can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the battery pack structure provided for an embodiment of the present invention.

[0039] Figure 2 for Figure 1 The battery pack shown is a cross-sectional view along the AA direction.

[0040] Figure 3 for Figure 2 A magnified view of the area at point X in the image.

[0041] Figure 4 for Figure 2 The exploded view shows the cell assembly and heat exchange assembly of the battery pack.

[0042] Figure 5 A schematic diagram of the structure of the third support member provided in an embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of the structure of a second type of box cover assembly provided in an embodiment of the present invention.

[0044] Figure 7 for Figure 6 The diagram shows the structure of the fourth support member of the box cover assembly.

[0045] Figure 8 for Figure 6 The exploded view of the box cover assembly is shown.

[0046] Figure 9 An exploded view of the housing, the first heat exchange component, and the battery cell assembly provided for an embodiment of the present invention.

[0047] Figure 10 for Figure 9 The diagram shows the assembly of the housing and the first heat exchange component.

[0048] Figure 11 for Figure 10 The diagram shows a cross-sectional view of the housing and the first heat exchange component along the BB direction.

[0049] Figure 12 for Figure 11 A magnified view of the area at point Y.

[0050] Figure 13 for Figure 12 The exploded view of the first positioning structure is shown.

[0051] Figure 14 for Figure 1 a perspective view of the battery pack.

[0052] Figure 15 for Figure 14 an exploded view of the battery pack.

[0053] Figure 16 for Figure 14 a local enlarged view at Z in FIG.

[0054] The various labels of the figures are as follows:

[0055] 100, cell assembly;

[0056] 11, cell; 111, output pole; 112, functional area; 113, non-functional area; 12, busbar; 13, first gap;

[0057] 200, heat exchange assembly;

[0058] 21, first heat exchange component; 211, second positioning structure; 211a, first positioning hole; 221, first buffer layer; 222, first support; 223, second support; 224, third support; 23, second heat exchange component;

[0059] 300, box body;

[0060] 31, sub-box body; 311, fixing lug; 312, second positioning column; 313, second positioning hole; 32, first positioning structure; 321, first positioning column; 322, positioning bracket; 3221, bracket bottom plate; 3222, bracket side plate; 3223, bracket top plate; 323, first locking component; 3224, first mounting hole; 3225, second mounting hole; 3226, third mounting hole; 33, mounting portion;

[0061] 400, box cover assembly;

[0062] 41, box cover; 42, second buffer layer; 421, second protruding portion; 43, panel; 431, first protruding portion; 4311, first protruding rib; 4312, first protruding boss; 432, first recess; 433, second recess; 44, fourth support; 441, connecting recess; 4411, second section; 4412, third section; 4313, second protruding rib; 442, first section; 45, first fastener; 46, second fastener;

[0063] 500, bottom cover;

[0064] 600, connecting plate;

[0065] H1, first direction; H2, second direction; H3, third direction. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0067] The battery pack provided by the embodiments of the present application can be applied to an electric device. The electric device can be, but is not limited to, a vehicle, a smart wearable device, a mobile terminal, a household appliance, and a medical instrument, and the embodiments of the present application do not limit the electric device. The vehicle includes, but is not limited to, a car, a bus, a train, a ship, a flight device, and the like. The smart wearable device includes, but is not limited to, a smart watch, a smart bracelet, a cervical vertebra massage instrument, and the like. The mobile terminal includes, but is not limited to, a smart phone, a notebook computer, a tablet computer, and a POS (point of sales terminal) machine. The household appliance includes, but is not limited to, a television, a washing machine, an air conditioner, an electric rice cooker, a smart sweeper, and a smart lamp. The medical instrument includes, but is not limited to, an infrared electronic thermometer, a pulse oximeter, and a human body composition analyzer. Of course, the battery pack can also be applied to an energy storage device, and the embodiments of the present application do not limit the battery pack.

[0068] Please refer to Figure 1 , Figure 2 and Figure 3 The battery pack can include a cell assembly 100 and a heat exchange assembly 200. The cell assembly 100 includes a plurality of cells 11, and a side surface of the cell 11 at which an output pole 111 is located includes a functional area 112 and a non-functional area 113. The functional area 112 is provided with at least one of the output pole 111, a liquid injection hole, and an explosion-proof valve. The heat exchange assembly includes a first heat exchange component 21 and a first support 222. The first heat exchange component 21 is arranged at the side of the cell 11 at which the output pole 111 is located. One side of the first support 222 abuts against an adjacent first heat exchange component 21, and the other side of the first support 222 abuts against an adjacent non-functional area 113 of the cell 11.

[0069] Therefore, when the battery pack vibrates, at least part of the impact force of the first heat exchange component 21 can be transmitted to the non-functional area 113 of the battery cell 11 through the first support 222, so as to avoid the whole impact force of the first heat exchange component 21 directly acting on the functional area 112 of the battery cell 11, and finally the technical problem that the structure at the functional area 112 of the battery cell 11 is easily damaged by the first heat exchange component 21 can be improved.

[0070] It can be understood that the functional area 112 can be provided with only one of the output pole 111, the liquid injection hole and the explosion-proof valve, or any two or more of the output pole 111, the liquid injection hole and the explosion-proof valve, which is not limited in the embodiments of the present application.

[0071] Please refer to Figure 3 and Figure 4 In some embodiments, the battery cell assembly 100 further comprises a busbar 12. The battery cell 11 is electrically connected with the busbar 12. Among them, the first heat exchange component 21 can be connected with the pole or the busbar 12 of the adjacent battery cell assembly 100 through the heat-conducting glue.

[0072] Then, the first heat exchange component 21 can be supported by the first support 222 to avoid the first heat exchange component 21 damaging the structure such as the pole, the busbar 12 and the like of the adjacent battery cell assembly 100.

[0073] In some embodiments, the first support 222 can be an insulating material to avoid the first support 222 causing short circuit inside the battery pack. For example, the first support 222 can be plastic. Of course, the first support 222 can also be a metal material, and the surface of the first support 222 is provided with an insulating layer to avoid the first support 222 causing short circuit inside the battery pack, which is not limited in the embodiments of the present application.

[0074] In some embodiments, the first support 222 can include a hard support, so as to ensure sufficient support strength of the first support 222. For example, the first support 222 can be an epoxy resin piece, a glass fiber piece, an epoxy resin and glass fiber composite material piece and the like, which is not limited in the embodiments of the present application.

[0075] In some embodiments, the first support 222 can be a hollow structure, so that the first support 222 has the advantage of lower weight, so as to reduce the strength of the whole battery pack.

[0076] Of course, in some other embodiments, the first support 222 can also be a solid structure, so that the strength of the first support 222 is better. In addition, part of the first support 222 can be a hollow structure, and part of the first support 222 can be a solid structure, which is not limited in the embodiments of the present application.

[0077] The number of the first support members 222 can be one or multiple, and the embodiments of the present application do not limit this. When the number of the first support members 222 is multiple, the support force received by each part of the first heat exchange component 21 can be more uniform and dispersed through the multiple first support members 222.

[0078] The first support member 222 can be arranged close to the middle part of the corresponding first heat exchange component 21, or arranged close to the side of the corresponding first heat exchange component 21, or multiple first support members 222 can be arranged along the length or width direction of the corresponding first heat exchange component 21, and the embodiments of the present application do not limit this.

[0079] In some embodiments, the first support member 222 can be lapped on the adjacent battery cell 11.

[0080] For example, the first support member 222 can be located on the upper side of the lapped battery cell 11, so that the first support member 222 is supported by the battery cell 11 to provide support to the adjacent first heat exchange component 21 from bottom to top. Of course, the first support member 222 can also be located on the lower side of the lapped battery cell 11, and the embodiments of the present application do not limit this.

[0081] It can be understood that the first support member 222 can be lapped on the adjacent battery cell 11 by bonding, and the first support member 222 can also be lapped on the adjacent battery cell 11 by clamping, welding, fusion or other any one way, and the embodiments of the present application do not limit this.

[0082] That is, the first support member 222 and the battery cell 11 lapped on each other can be fixedly connected. Further, the displacement of the first support member 222 during use can be avoided, so that the reliability and stability of the battery pack can be improved.

[0083] In some embodiments, the battery cell assembly 100 includes at least two rows of battery cells 11. Then, the first support member 222 can be lapped with the adjacent two rows of battery cells 11.

[0084] It can be understood that when the battery pack vibrates, the relative displacement between the adjacent two rows of battery cells 11 is prone to occur. Therefore, by lapping the support member 22 with the adjacent two rows of battery cells 11, the amplitude of the relative displacement between the adjacent two rows of battery cells 11 can be reduced, so that the stability of the installation of the battery cell assembly 100 can be improved. Correspondingly, the amplitude of the relative displacement between the adjacent two rows of battery cells 11 can also be avoided to be too large, so that the stress of the region above the first heat exchange component 21 located at the junction of the adjacent two rows of battery cells 11 is too concentrated, and the probability of damage of the first heat exchange component 21 can be reduced.

[0085] In some embodiments, each end of the first support 222 in the width direction overlaps with a column of the battery cells 11. The width of the portion of the first support 222 overlapping with each column of the battery cells 11 in the width direction of the first support 222 is greater than or equal to 3 mm.

[0086] In this way, the first support 222 can have a large enough overlapping area with each column of the battery cells 11. In this way, on the one hand, the stability of the connection between the first support 222 and each column of the battery cells 11 can be ensured; on the other hand, even if there is a certain error in the assembly of the first support 222, the first support 222 can still overlap the battery cells 11.

[0087] For example, the width of the portion of the first support 222 overlapping with each column of the battery cells 11 in the width direction of the first support 222 is 3 mm, 3.7 mm, 4 mm, 4.33 mm, 4.5 mm, 4.8 mm, 5 mm, or 6 mm, which is not limited in the embodiments of the present application.

[0088] In some embodiments, the width of the first support 222 can be greater than or equal to 12 mm. In this way, by using a first support 222 that is wide enough, the width of the portion of the first support 222 overlapping with each column of the battery cells 11 can be ensured, and in turn the stability and reliability of the overlap of the first support 222 can be ensured.

[0089] For example, the width of the first support 222 can be 12 mm, 12.7 mm, 13 mm, 13.5 mm, 14 mm, 15.5 mm, 16 mm, 17.55 mm, or 18 mm, which is not limited in the embodiments of the present application.

[0090] In some embodiments, the number of the battery cell assemblies 100 is at least two, and all the battery cell assemblies 100 can be arranged in the first direction H1. In this way, the power storage capacity of the battery pack can be increased by using multiple battery cell assemblies 100.

[0091] It should be noted that the first direction H1 can be a vertical direction, or can be another direction, and the embodiments of the present application are mainly described by taking the first direction H1 as the vertical direction as an example.

[0092] In some embodiments, each battery cell assembly 100 is provided with a first heat exchange component 21 and a first support 222 on the same side of the battery cell assembly 100 in the first direction H1. In this way, the same side (e.g., the top) of each battery cell assembly 100 can be heat-exchanged by the corresponding first heat exchange component 21, so as to improve the accuracy and reliability of temperature regulation at each battery cell assembly 100.

[0093] In some embodiments, each battery cell assembly 100 comprises a plurality of rows of battery cells 11, and the plurality of rows of battery cells 11 of the same battery cell assembly 100 are arranged along the second direction H2. The plurality of battery cells 11 of the same row are arranged along the third direction H3, and the first direction H1, the second direction H2 and the third direction H3 are perpendicular to each other.

[0094] It should be noted that the first direction H1 can be the vertical direction (or alternatively understood as the height direction of the battery pack), the second direction H2 can be the front-rear direction (or alternatively understood as the width direction of the battery pack), and the third direction H3 can be the left-right direction (or alternatively understood as the length direction of the battery pack). Of course, the specific directions of the first direction H1, the second direction H2 and the third direction H3 can be interchangeable, and the embodiments of the present application do not limit this. Hereinafter, the embodiments of the present application will continue to be described mainly by taking the first direction H1 as the vertical direction as an example.

[0095] The number of the first supports 222 is a plurality, and at least two first supports 222 are arranged at intervals along the second direction H2, and each first support 222 extends along the third direction H3.

[0096] Thus, on the one hand, in the width direction of the battery pack (i.e. the second direction H2), the plurality of first supports 222 can provide support to the first heat exchange component 21 at different positions to make the force on each part of the first heat exchange component 21 in the width direction of the battery pack more uniform. On the other hand, in the length direction of the battery pack (i.e. the third direction H3), each first support 222 can provide support to the first heat exchange component 21 at different positions in the length direction to make the force on each part of the first heat exchange component 21 in the length direction of the battery pack more uniform.

[0097] As mentioned above, in some embodiments, the battery cell assembly 100 comprises at least two rows of battery cells 11. Then, the first support 222 can overlap with the two adjacent rows of battery cells 11.

[0098] In some embodiments, the two adjacent rows of battery cells 11 in the same battery cell assembly 100 have a first gap 13 therebetween, and at least one first support 222 is arranged corresponding to the at least one first gap 13 along the first direction H1.

[0099] In some embodiments, the at least one first gap 13 at each battery cell assembly 100 corresponds to one first support 222 along the first direction H1.

[0100] In some embodiments, however, each first gap 13 at at least one battery cell assembly 100 corresponds to one first support 222 along the first direction H1.

[0101] In some embodiments, the first support 222 is arranged to extend along the length direction of the battery cell assembly 100. The ratio of the length of the first support 222 to the length of the battery cell assembly 100 is greater than or equal to three-fifths. Thus, along the length direction of the battery cell assembly 100, the first support 222 can provide better support to more positions of the first heat exchange component 21, so that the support force provided by the first support 222 is more dispersed and uniform.

[0102] For example, the ratio of the length of the first support 222 to the length of the battery cell assembly 100 is greater than or equal to three-fifths, four-fifths, five-sixths, six-sevenths, seven-eighths, or eight-ninths, or even the length of the first support 222 can be equal to the length of the battery cell assembly 100, which is not limited in the embodiments of the present application.

[0103] The above is some examples of the first support 222 in the embodiments of the present application.

[0104] In some embodiments, the heat exchange assembly 200 further comprises a second support 223. The second support 223 is located between the first heat exchange component 21 and the top battery cell assembly 100.

[0105] That is, between the two adjacent battery cell assemblies 100, the first support 222 is arranged between the first heat exchange component 21 and the bottom battery cell assembly 100 to support the first heat exchange component 21, and the second support 223 is located between the first heat exchange component 21 and the top battery cell assembly 100 to directly or indirectly support the top battery cell assembly 100.

[0106] The number of the second support 223 can be one or multiple, which is not limited in the embodiments of the present application.

[0107] In some embodiments, the heat exchange assembly 200 further comprises at least two second heat exchange components 23, and each side of the battery cell assembly 100 away from the first heat exchange component 21 is provided with a second heat exchange component 23 for heat exchange. Thus, the upper and lower sides of each battery cell assembly 100 are heat exchanged by the first heat exchange assembly 200 and the second heat exchange assembly 200, so that the temperature of each position of each battery cell assembly 100 in the battery pack is more accurately controllable.

[0108] Then, the second support 223 can be interposed between the adjacent first heat exchange component 21 and the second heat exchange component 23 to indirectly support the battery cell assembly 100 above by supporting the second heat exchange component 23.

[0109] In some embodiments, the structural strength of the second heat exchange component 23 is greater than that of the first heat exchange component 21.

[0110] Therefore, when the battery pack is impacted, the upper cell assembly 100 is heavy, and thus, a large impact is directly caused to the second heat exchange component 23 located below the cell assembly 100. Therefore, the structural strength of the second heat exchange component 23 is greater than that of the first heat exchange component 21, and thus, the second heat exchange component 23 can be effectively prevented from being damaged by the direct impact of the upper cell assembly 100.

[0111] In some embodiments, the thickness of the second heat exchange component 23 is greater than that of the first heat exchange component 21, so that the structural strength of the second heat exchange component 23 is greater than that of the first heat exchange component 21.

[0112] In some embodiments, the first heat exchange component 21 includes a stamping forming plate, and the stamping forming plate forms a flow channel for the cooling medium to flow. The second heat exchange component 23 includes an extrusion forming plate, and the extrusion forming plate forms a flow channel for the cooling medium to flow.

[0113] Therefore, the first heat exchange component 21 formed by the stamping forming plate is relatively thin compared with the extrusion forming second heat exchange component 23, so that the structural strength of the second heat exchange component 23 is greater than that of the first heat exchange component 21.

[0114] When the first heat exchange component 21 includes the stamping forming plate, two stamping forming plates can be stacked and connected to form a flow channel for the cooling medium to flow between the two stamping forming plates.

[0115] In some embodiments, the first heat exchange component 21 is provided with a flow channel for the cooling medium to flow, and the second support 223 abuts the non-flow channel region of the adjacent first heat exchange component 21, so that the impact force received by the second heat exchange component 23 can be directly transmitted to the flow channel region of the first heat exchange component 21 below through the second support 223, to prevent the flow channel region of the first heat exchange component 21 from being damaged and causing the cooling medium to leak and cause short circuit inside the battery pack.

[0116] Of course, in some other embodiments, the first heat exchange component 21 can also include a first heating film for heating the cell assembly 100, which is not limited in the embodiments of the present application.

[0117] In some other embodiments, the second heat exchange component 23 can also include a second heating film for heating the cell assembly 100, which is not limited in the embodiments of the present application.

[0118] In some embodiments, the second support 223 can be made of insulating material to avoid causing short circuit inside the battery pack. For example, the second support 223 can be made of plastic. Of course, the second support 223 can also be made of metal material, and the surface of the second support 223 is provided with an insulating layer to avoid causing short circuit inside the battery pack, and the embodiments of the present application do not make any limitation in this regard.

[0119] In some embodiments, the second support 223 can include a hard support, so as to ensure sufficient support strength of the second support 223. For example, the second support 223 can be made of epoxy resin, glass fiber, epoxy resin and glass fiber composite material, etc., and the embodiments of the present application do not make any limitation in this regard.

[0120] Of course, the second support 223 can also include the first buffer layer 221. For example, at least one side surface of the second support 223 is provided with the first buffer layer 221.

[0121] For example, the first buffer layer 221 can abut against the second heat exchange component 23. Further, when the battery pack vibrates, the second heat exchange component 23 and the first heat exchange component 21 can be avoided by the first buffer layer 221.

[0122] The first buffer layer 221 can be a silica gel foam piece, or any other elastic piece, and the embodiments of the present application do not make any limitation in this regard.

[0123] In some embodiments, the second support 223 can be a hollow structure, so as to make the second support 223 have the advantage of lower weight, so as to reduce the overall strength of the battery pack.

[0124] Of course, in some other embodiments, the second support 223 can also be a solid structure, so as to make the second support 223 have better strength. In addition, part of the second support 223 can be a hollow structure, and part of the second support 223 can be a solid structure, and the embodiments of the present application do not make any limitation in this regard.

[0125] In some embodiments, the second support 223 is arranged to extend along the length direction of the cell assembly 100. The ratio of the length of the second support 223 to the length of the cell assembly 100 is greater than or equal to three-fifths. Thus, along the length direction of the cell assembly 100, the second support 223 can provide better support to more positions of the second heat exchange component 23 and the first heat exchange component 21, so as to make the support force provided by the second support 223 more dispersed and uniform.

[0126] For example, the ratio of the length of the second support 223 to the length of the battery cell assembly 100 is greater than or equal to three-fifths, four-fifths, five-sixths, six-sevenths, seven-eighths, or eight-ninths, or even the length of the second support 223 can be equal to the length of the battery cell assembly 100, which is not limited in the embodiments of the present application.

[0127] It can be understood that the number of the second support 223 can be one or multiple, which is not limited in the embodiments of the present application. When the number of the second support 223 is at least two, the support effect can be improved by the multiple second supports 223, thereby improving the stability and reliability of the battery pack.

[0128] In some embodiments, the first support 222 and / or the second support 223 can be in a long strip shape, so as to not only play a support effect on the second heat exchange component 23 and the first heat exchange component 21, but also avoid the second support 223 in a plate shape causing the battery pack to be too heavy.

[0129] The second support 223 can be arranged near the middle part of the corresponding first heat exchange component 21, or arranged near the side of the corresponding first heat exchange component 21, or multiple second supports 223 can be arranged along the length or width direction of the corresponding first heat exchange component 21, which is not limited in the embodiments of the present application.

[0130] It has been mentioned above that in some embodiments, all the battery cell assemblies 100 are arranged along the first direction H1. Each battery cell assembly 100 includes multiple columns of battery cells 11, and the multiple columns of battery cells 11 of the same battery cell assembly 100 are arranged along the second direction H2. The multiple battery cells 11 in the same column are arranged along the third direction H3, and the first direction H1, the second direction H2, and the third direction H3 intersect with each other.

[0131] The number of the second support 223 is multiple, and at least two second supports 223 are arranged at intervals along the second direction H2, and each second support 223 is arranged to extend along the third direction H3.

[0132] Therefore, on the one hand, in the width direction (i.e., the second direction H2) of the battery pack, multiple second supports 223 can be provided to support different positions of the second heat exchange component 23, so that the stress of the second heat exchange component 23 at each position in the width direction of the battery pack is more uniform. On the other hand, in the length direction (i.e., the third direction H3) of the battery pack, each second support 223 can be arranged to support the second heat exchange component 23 at each position in the length direction of the battery pack, so that the stress of the second heat exchange component 23 at each position in the length direction of the battery pack is more uniform.

[0133] It has been mentioned above that, in some embodiments, there is a first gap 13 between two adjacent rows of battery cells 11 in the same battery cell assembly 100. Then, it can be that at least one first gap 13 at each battery cell assembly 100 is correspondingly arranged with a second support 223 along the first direction H1.

[0134] Then, it can also be understood that the second support 223 is located at the lower side of the first gap 13. It can also be understood that when the battery pack vibrates, the relative displacement between the two adjacent rows of battery cells 11 is prone to occur, so that the stress formed inside the second heat exchange component 23 is mainly concentrated in the area located at the lower side of the first gap 13. Therefore, by arranging the second support 223 at the lower side of the first gap 13, the area of the second heat exchange component 23 corresponding to the first gap 13 can be supported to reduce the probability of damage of the area of the second heat exchange component 23 corresponding to the first gap 13.

[0135] In some embodiments, each first gap 13 at at least one battery cell assembly 100 is correspondingly arranged with a second support 223 along the first direction H1.

[0136] In some embodiments, along the first direction H1, the gap between two adjacent battery cell assemblies 100 is D1, and the height of the second support 223 is D2, and the ratio of D1 to D2 is 13:4 to 13:5.

[0137] Therefore, it can be avoided that the height of the second support 223 is too small to cause too low structural strength, or that the height of the second support 223 is too small to cause that the first heat exchange component 21 and the second heat exchange component 23 cannot be spaced apart by a large enough gap; it can also be avoided that the height of the second support 223 is too large to waste more space in the battery pack, so that the energy density of the battery pack can be improved.

[0138] For example, the ratio of D1 to D2 is 13:4, 13:4.1, 13:4.4, 13:4.5, 13:4.55, 13:4.6, 13:4.8, 13:4.9 or 13:5, which is not limited in the embodiments of the present application.

[0139] In some embodiments, along the first direction H1, the height of the second support 223 protruding from the corresponding first heat exchange component 21 is greater than or equal to 2 millimeters.

[0140] Therefore, it can be avoided that the height of the second support 223 is too small to cause too low structural strength, or that the height of the second support 223 is too small to cause that the first heat exchange component 21 and the second heat exchange component 23 cannot be spaced apart by a large enough gap; it can also be avoided that the height of the second support 223 is too large to waste more space in the battery pack, so that the energy density of the battery pack can be improved.

[0141] For example, along the first direction H1, the second support 223 protrudes from the first heat exchange component 21 by a height of 2 mm, 2.4 mm, 3 mm, 3.5 mm, or 4 mm, which is not limited in the embodiments of the present application.

[0142] In some embodiments, along the first direction H1, the gap between the two adjacent battery cell assemblies 100 is D1, the height of the two adjacent battery cell assemblies 100 and the gap between the two adjacent battery cell assemblies 100 are D3, and the ratio of D1 to D3 is 3:20 to 1:15.

[0143] Therefore, it can avoid the gap between the two adjacent battery cell assemblies 100 being too small to easily impact and damage the first heat exchange component 21 and / or the second heat exchange component 23, and it can also avoid the gap between the two adjacent battery cell assemblies 100 being too large to reduce the energy density of the battery pack.

[0144] For example, the ratio of D1 to D3 is 3:20, 2:20, 2:15, or 1:15, which is not limited in the embodiments of the present application.

[0145] In some embodiments, along the first direction H1, the gap between the two adjacent battery cell assemblies 100 is D1, the height of the first support 222 is D4, and the ratio of D1 to D4 is 13:6 to 13:7.

[0146] Therefore, it can avoid the height of the first support 222 being too small to cause the structural strength to be too low, or it can avoid the height of the first support 222 being too small to separate the first heat exchange component 21 and the battery cell assembly 100 by a large enough gap; and it can also avoid the height of the first support 222 being too large to waste more space in the battery pack, thereby improving the energy density of the battery pack.

[0147] For example, the ratio of D1 to D4 is 13:6, 13:61, 13:623, 13:637, 13:641, 13:65, 13:67, 13:687, 13:69, or 13:7, which is not limited in the embodiments of the present application.

[0148] Please continue to refer to Figure 5 In some embodiments, the heat exchange assembly 200 further comprises a third support 224. The third support 224 is arranged through the first heat exchange component 21 to be clamped between the two adjacent battery cell assemblies 100.

[0149] The above is some examples of the support 22 in the embodiments of the present application.

[0150] As Figure 1As shown, the battery pack can further include a box body 300, and the cell assembly 100 and the heat exchange assembly 200 are at least partially disposed in the box body 300.

[0151] Please continue to refer to Figure 6 The battery pack can further include a box cover assembly 400. The box body 300 has a containing space and an opening in communication with the containing space. The box cover assembly 400 includes a box cover 41 and a second buffer layer 42. The box cover 41 is connected with the box body 300 to close the opening of the box body 300. The second buffer layer 42 is arranged on a side of the box cover 41 away from the containing space, and the buffer performance of the second buffer layer 42 is greater than that of the box cover 41.

[0152] Therefore, during installation, the installer can step on the second buffer layer 42 of the box cover assembly 400 for installation, so as to provide a better buffering effect by the second buffer layer 42, thereby avoiding deformation or even damage of the box cover 41, and ultimately improving the technical problem that the box cover 41 of the battery pack is prone to deformation or even rupture during installation.

[0153] It should be noted here that the buffer performance of the second buffer layer 42 is greater than that of the box cover 41, which can be understood as the second buffer layer 42 being more prone to deformation than the box cover 41. Thus, when the user steps on the second buffer layer 42 of the box cover assembly 400, the second buffer layer 42 can deform before the box cover 41, thereby providing buffering to the box cover 41 by the second buffer layer 42.

[0154] For example, the second buffer layer 42 can include an elastic buffer layer. The elastic buffer layer can include foam, such as MMP foam (Microcellular Polypropylene foam), EVA foam (Ethylene Vinyl Acetate Copolymer Foam), etc. The second buffer layer 42 can also include an elastic rubber layer or any other structure having a buffering effect, and the embodiments of the present application do not limit this.

[0155] In some embodiments, the box cover assembly 400 further includes a panel 43. The panel 43 is arranged on a side of the second buffer layer 42 away from the box cover 41. The rigidity of the panel 43 is greater than that of the second buffer layer 42.

[0156] Then, during installation, the user can step on the panel 43. At this time, since the rigidity of the panel 43 is greater than that of the second buffer layer 42 and thus is less prone to deformation, the force acting on the panel 43 can be dispersedly transmitted to various parts of the second buffer layer 42 through the panel 43, thereby enabling the second buffer layer 42 and the panel 43 to cooperate with each other to provide a better buffering and supporting effect, so as to avoid deformation or even damage of the box cover 41.

[0157] The panel 43 can be a metal piece, a hard plastic piece, or the like, such that the rigidity of the panel 43 is greater than the rigidity of the second buffer layer 42, and the embodiments of the present application are not limited in this regard. For example, the panel 43 can be a steel material, such as a high-strength steel of DP780 or the like, and of course the metal piece can also be an iron material or an alloy material, and the embodiments of the present application are not limited in this regard.

[0158] In some embodiments, the box cover assembly 400 further includes a fourth support 44. The fourth support 44 is connected between the box cover 41 and the panel 43, and the rigidity of the fourth support 44 is greater than the rigidity of the second buffer layer 42. Thus, when the installer steps on the panel 43, on the one hand, the second buffer layer 42 and the panel 43 can be adaptively deformed to provide better buffering effect, thereby avoiding damage to the box cover assembly 400; on the other hand, the fourth support 44 can provide better support effect to the corresponding part of the panel 43, so as to avoid the situation that the deformation amount of the panel 43 and the second buffer layer 42 is too large, thereby causing the installer to step unstable.

[0159] The fourth support 44 can include a metal piece, a hard plastic piece, or the like, and the embodiments of the present application are not limited in this regard. For example, the metal piece can be a steel material, such as a high-strength steel of DP780 or the like, and of course the metal piece can also be an iron material or an alloy material, and the embodiments of the present application are not limited in this regard.

[0160] In some embodiments, the number of the fourth supports 44 is at least two. Thus, by supporting multiple places of the panel 43 through the plurality of fourth supports 44, not only can the installation of the panel 43 be more stable, but also the overall stress of the panel 43 can be more dispersed and uniform, so that the stress on the panel 43 when the installer steps on it can be dispersed to the box cover 41, thereby avoiding deformation or even rupture of the box cover 41.

[0161] In some embodiments, the at least two fourth supports 44 are arranged on opposite sides of the second buffer layer 42, so that the fourth supports 44 can provide better support to the panel 43 from both sides of the second buffer layer 42.

[0162] For example, each side of the second buffer layer 42 in the width direction and / or each side of the second buffer layer 42 in the length direction is provided with a fourth support 44.

[0163] That is, each side of the second buffer layer 42 in the width direction can be provided with the fourth support 44, and each side of the second buffer layer 42 in the length direction can not be provided with the fourth support 44; each side of the second buffer layer 42 in the width direction can not be provided with the fourth support 44, and each side of the second buffer layer 42 in the length direction can be provided with the fourth support 44; each side of the second buffer layer 42 in the width direction can be provided with the fourth support 44, and each side of the second buffer layer 42 in the length direction can be provided with the fourth support 44, which is not limited in the embodiments of the present application.

[0164] Then, compared with only providing the fourth support 44 on one side of the second buffer layer 42, when each side of the second buffer layer 42 in the width direction is provided with the fourth support 44, the panel 43 can avoid the situation of collapse or insufficient support on one side of the second buffer layer 42 in the width direction; when each side of the second buffer layer 42 in the length direction is provided with the fourth support 44, the panel 43 can avoid the situation of collapse or insufficient support on one side of the second buffer layer 42 in the length direction.

[0165] Of course, in some other embodiments, the number of the fourth support 44 can also be one, which is not limited in the embodiments of the present application.

[0166] In some embodiments, the fourth support 44 is connected and fixed with the panel 43, so it can also be understood that the fourth support 44 is installed on the panel 43 to avoid the situation of displacement and falling off of the panel 43, thereby ensuring the stability and reliability of the box cover assembly 400.

[0167] In some embodiments, the fourth support 44 is connected and fixed with the box cover 41. So it can also be understood that the fourth support 44 is installed on the box cover 41 to avoid the situation of displacement and falling off of the panel 43, thereby ensuring the stability and reliability of the box cover assembly 400.

[0168] It can also be understood that when the fourth support 44 is connected with the panel 43 and the box cover 41 respectively, if each side of the second buffer layer 42 in the width direction and / or each side of the second buffer layer 42 in the length direction is provided with the fourth support 44, when the user steps on the position corresponding to the panel 43 and the second buffer layer 42, the corresponding position of the panel 43 and the second buffer layer 42 will be concave towards the box cover 41; at this time, the fourth support 44 can limit the degree of warping of the part of the panel 43 located on both sides of the second buffer layer 42 in the length direction and / or the width direction, so as to avoid excessive deformation of the panel 43, and it can also be understood that the fourth support 44 holds the part of the panel 43 located on both sides of the second buffer layer 42 in the length direction and / or the width direction, so that the overall stress of the panel 43 is more uniform and dispersed, thereby improving the stability and reliability of the box cover assembly 400.

[0169] Please continue to refer to Figure 7 and Figure 8 In some embodiments, the fourth support 44 is bent and arranged, the fourth support 44 includes a plurality of connection recesses 441 concave towards the box cover 41, the connection recesses 441 are connected and fixed with the box cover 41, so that the fourth support 44 can form multiple connections between the plurality of connection recesses 441 and the box cover 41, so that the stress between the fourth support 44 and the box cover 41 is more uniform, so as to improve the stability and reliability of the connection between the fourth support 44 and the box cover 41.

[0170] The fourth support 44 can be a plate member. For example, the fourth support 44 is a sheet metal member formed by bending, stamping, deep drawing and the like, thereby forming a plurality of connection recesses 441.

[0171] For example, the fourth support 44 includes a plurality of first segments 442, the first segments 442 are arranged in the length direction of the fourth support 44 and are spaced apart from the connection recesses 441. The connection recess 441 includes a second segment 4411 and a plurality of third segments 4412, the second segment 4411 is connected with the box cover 41, one end of each third segment 4412 is connected with the adjacent second segment 4411 by bending, and the other end of each third segment 4412 is connected with the adjacent first segment 442 by bending.

[0172] Therefore, it can also be understood that the fourth support 44 forms a plurality of arch-shaped structures bent towards the box cover 41 through the plurality of second segments 4411 and the plurality of third segments 4412, thereby improving the strength of the fourth support 44 on the basis of the thinness of the fourth support 44 to reduce the weight of the battery pack, so that the fourth support 44 can more stably support the panel 43.

[0173] In some embodiments, the box cover assembly 400 further comprises a first fastener 45. The first fastener 45 connects the box cover 41 and the box body 300, so that the box cover 41 can be stably and reliably mounted to the box body 300.

[0174] In some embodiments, at least part of the first fastener 45 is also arranged in the connecting recess 441, so that the connecting recess 441 is fixed to the box cover 41. Therefore, it can also be understood that the first fastener 45 is used for the connection and fixation of the box cover 41 and the fourth support 44, so as to reduce the number of parts of the box cover assembly 400, thereby reducing the manufacturing and assembly difficulty of the box cover assembly 400.

[0175] In some embodiments, in the same fourth support 44, a plurality of connecting recesses 441 are arranged along the edge of the box cover 41, and the distance between two adjacent connecting recesses 441 is 80-100 mm.

[0176] Therefore, on the one hand, the distance between two adjacent connecting recesses 441 can be avoided to be too large to cause insufficient strength of the fourth support 44; on the other hand, the distance between two adjacent connecting recesses 441 can also be avoided to be too small to cause more processing steps and greater processing difficulty of the fourth support 44.

[0177] For example, the distance between two adjacent connecting recesses 441 can be 80 mm, 83 mm, 84.7 mm, 85 mm, 89 mm, 89.3 mm, 90 mm, 90.07 mm, 92 mm, 93 mm, 94.5 mm, 95 mm, 96.7 mm, 98 mm, 98.97 mm, 99 mm, 99.5 mm or 100 mm, which is not limited in the embodiments of the present application.

[0178] In some embodiments, in the same fourth support 44, each connecting recess 441 is arranged with the first fastener 45, so that the distance between the first fasteners 45 can be avoided to be too large, thereby avoiding the decline of the connection stability between the box cover 41 and the box body 300 and the decline of the air tightness between the box cover 41 and the box body 300.

[0179] In some embodiments, in the same fourth support 44, no first fastener 45 is arranged between two adjacent connecting recesses 441, so that the distance between the first fasteners 45 can be avoided to be too small and too many first fasteners 45 are arranged, and finally the assembly difficulty of the box cover assembly 400 can be avoided to be too great and the cost can be avoided to be too high.

[0180] In some embodiments, the number of the first segments 442 between two adjacent first fasteners 45 on the same side edge of the box body 300 is less than or equal to 1, so that the first fasteners 45 are not arranged too close to each other, and the assembly of the box cover assembly 400 is not difficult.

[0181] The first fastener 45 can be a fastening screw, for example, a fastening screw with a size of M5, and of course the first fastener 45 can also be a rivet, etc., which is not limited in the embodiments of the present application.

[0182] In some embodiments, the box cover assembly 400 can further include a second fastener 46, which connects the first segment 442 and the panel 43. The second fastener 46 can be a fastening screw, for example, a fastening screw with a size of M5, and of course the first fastener 45 can also be a rivet, etc., which is not limited in the embodiments of the present application.

[0183] In some embodiments, the box cover assembly 400 can further include a third fastener, which is arranged through the panel 43 and the box cover 41 and connected with the box body 300, so as to fix the panel 43 and the box cover 41 to the box body 300. Therefore, it can also be understood that the third fastener is used for fixing the panel 43 to the box body 300 on the basis of fixing the box cover 41 to the box body 300, so as to reduce the number of parts of the box cover assembly 400, thereby reducing the manufacturing and assembly difficulty of the box cover assembly 400.

[0184] For example, the third fastener can be arranged through the panel 43, the connecting recess 441 and the box cover 41 and connected with the box body 300, so as to fix the panel 43, the fourth support 44 and the box cover 41 to the box body 300. At this time, it can also be understood that at least part of the first fastener 45 forms the third fastener.

[0185] For example, the third fastener can be arranged through the panel 43, the first segment 442 and the box cover 41 and connected with the box body 300, so as to fix the panel 43, the fourth support 44 and the box cover 41 to the box body 300. At this time, it can also be understood that at least part of the second fastener 46 forms the third fastener.

[0186] Of course, in some other embodiments, the third fastener can also not pass through the fourth support 44, which is not limited in the embodiments of the present application.

[0187] In some embodiments, the thickness of the fourth support 44 is 1-2 mm, so that the rigidity of the fourth support 44 is not insufficient due to the small thickness of the fourth support 44, and the energy density of the battery pack is not reduced due to the large thickness of the fourth support 44.

[0188] For example, the fourth support 44 can have a thickness of 1 mm, 1.1 mm, 1.27 mm, 1.3 mm, 1.5 mm, 1.67 mm, 1.79 mm, 1.85 mm, 1.9 mm, or 2 mm, which is not limited in the embodiments of the present application.

[0189] The above is some examples of the fourth support 44 in the embodiments of the present application. The embodiments of the present application will be further illustrated in combination with the structure of the panel 43.

[0190] In some embodiments, the second buffer layer 42 is arranged only at one end of the box cover 41 along the length direction. Therefore, by arranging the second buffer layer 42 and the panel 43 only at one end of the box cover 41 along the length direction, the requirement of the installer for stepping during the installation process can be met, and the consumption of the second buffer layer 42 and the panel 43 can be reduced, so as to reduce the overall weight and manufacturing cost of the battery pack.

[0191] In some embodiments, the panel 43 is provided with a reinforcing structure to improve the rigidity of the panel 43.

[0192] For example, the reinforcing structure includes a first protruding part 431 protruding away from the second buffer layer 42, and the height of the first protruding part 431 can be 2 mm to 3 mm, so as to avoid that the height of the first protruding part 431 is too small to cause insufficient rigidity of the first protruding part 431, and avoid that the height of the first protruding part 431 is too large to cause a decrease in the energy density of the battery pack.

[0193] For example, the height of the first protruding part 431 can be 2 mm, 2.1 mm, 2.27 mm, 2.3 mm, 2.5 mm, 2.67 mm, 2.79 mm, 2.85 mm, 2.9 mm, or 3 mm, which is not limited in the embodiments of the present application.

[0194] In some embodiments, the first protruding part 431 includes a first protruding rib 4311 and a plurality of first protruding parts 4312. The first protruding rib 4311 is arranged along the length direction of the panel 43, and each side of the first protruding rib 4311 in the width direction is arranged with a plurality of first protruding parts 4312.

[0195] It can be understood that as the length of the panel 43 increases, the rigidity of the panel 43 in the length direction will relatively decrease, and therefore, by arranging the first protruding ribs 4311 in the length direction of the panel 43, the rigidity of the panel 43 in the length direction can be higher. On this basis, by the plurality of first protruding ribs 4312, the rigidity of the panel 43 in the width direction can be ensured to be higher. Further, when the installer steps on the panel 43, the stress on the panel 43 can be more dispersed and uniform by the combination of the first protruding ribs 4311 and the plurality of first protruding ribs 4312.

[0196] In some embodiments, the ratio of the length of the first protruding rib 4311 to the length of the panel 43 is greater than or equal to 0.7, so that by the first protruding rib 4311 long enough, the rigidity of the panel 43 in the length direction can be improved.

[0197] For example, the ratio of the length of the first protruding rib 4311 to the length of the panel 43 is 0.7, 0.74, 0.76, 0.799, 0.8, 0.85, 0.869, 0.88, 0.892, 0.91, 0.95 or 1, which is not limited in the embodiments of the present application.

[0198] In some embodiments, on at least one side of the width direction of the first protruding rib 4311, the first protruding rib 4312 is arranged in the length direction of the first protruding rib 4311, and the first protruding rib 4312 is spaced apart from the first protruding rib 4311 to form a first groove 432 between the first protruding rib 4311 and the plurality of first protruding ribs 4312, and a second groove 433 is formed between two adjacent first protruding ribs 4311, one end of the second groove 433 is communicated with the first groove 432, and the other end of the second groove 433 is communicated to the outer circumferential side of the panel 43.

[0199] Therefore, it can also be understood that the first protruding part 431 defines a liquid drainage groove on the side of the panel 43 away from the second buffer layer 42, so as to avoid some liquid flow on the upper surface of the panel 43 during assembly or subsequent use, thereby causing a safety hazard of the battery pack. The liquid drainage groove includes the first groove 432 and the second groove 433.

[0200] In some embodiments, the first protruding part 431 further includes a second protruding rib 4313, and each side edge of the panel 43 in the length direction is provided with the second protruding rib 4313. Each end of the first protruding rib 4311 is connected with the second protruding rib 4313 on one side. The first protruding rib 4312 is located between the second protruding ribs 4313 on both sides. Therefore, it can be understood that when the panel 43 is stepped on, the deformation of the panel 43 is usually large at the four edges, and therefore, by the cooperation of the second protruding rib 4313 and the first protruding rib 4311, the strength of the panel 43 at the edges can be improved.

[0201] In some embodiments, the side surface of the second buffer layer 42 facing the panel 43 has the same shape as the side surface of the panel 43 facing the second buffer layer 42, so that the panel 43 can be in contact with the second buffer layer 42 everywhere, so that the panel 43 can be better supported and buffered by the second buffer layer 42 everywhere, and thus the force received by the panel 43 can be uniformly transmitted to the box cover 41 through the second buffer layer 42.

[0202] For example, the side surface of the second buffer layer 42 facing the panel 43 is provided with a second protrusion 421, and the shape of the second protrusion 421 matches the shape of the first protrusion 431, so as to be embedded in the side of the first protrusion 431 facing the second buffer layer 42.

[0203] In some embodiments, the thickness of the second buffer layer 42 is D5, the sum of the thicknesses of the box cover 41, the second buffer layer 42 and the panel 43 is D6, and the ratio of D5 to D6 is greater than or equal to 2:3, that is, the ratio of D5 to D6 is greater than or equal to two-thirds, so that the second buffer layer 42 can be prevented from being too thin, so as to ensure that the box cover assembly 400 has sufficient buffering effect.

[0204] In some embodiments, the ratio of D5 to D6 is less than or equal to 7:8, that is, the ratio of D5 to D6 is less than or equal to eight-sevenths, so that the second buffer layer 42 can be prevented from being too thick, so as to avoid reducing the energy density of the battery pack.

[0205] For example, the ratio of D5 to D6 can be 2:3, 3:4, 4:5, 5:6, 6:7 or 7:8, which is not limited in the embodiments of the present application.

[0206] In some embodiments, the thickness of the buffer layer is D5, and the thickness of the box cover is D7. The ratio of D5 to D7 is greater than or equal to 4, so that the second buffer layer 42 can be prevented from being too thin, so as to ensure that the box cover assembly 400 has sufficient buffering effect.

[0207] In some embodiments, the ratio of D5 to D7 is less than or equal to 15, so that the second buffer layer 42 can be prevented from being too thick, so as to avoid reducing the energy density of the battery pack.

[0208] For example, the ratio of D5 to D7 can be 4, 4.5, 5, 5.7, 6, 6.9, 8, 9.5, 10.01, 11, 12.3, 13.8, 14, 14.5 or 15, which is not limited in the embodiments of the present application.

[0209] Please continue to refer to Figure 9In some embodiments, the box 300 is provided with a first positioning structure 32, and the first heat exchange component 21 is provided with a second positioning structure 211, and the first positioning structure 32 and the second positioning structure 211 are matched to be used for positioning during the process of covering the first heat exchange component 21 to the battery cell assembly 100.

[0210] It can be understood that, in the prior art, the installation of the first heat exchange component 21 is realized by covering the first heat exchange component 21 to the battery cell assembly 100 manually by an operator, and there is no positioning structure to guide the positioning between the first heat exchange component 21 and the battery cell assembly 100, so that the position deviation of the first heat exchange component 21 when covering the battery cell assembly 100 is easily caused. In contrast, in the embodiments of the present application, the positioning of the first heat exchange component 21 during the installation process can be realized through the cooperation of the first positioning structure 32 and the second positioning structure 211, so as to improve the technical problem of low position accuracy of the first heat exchange component 21 installation.

[0211] It can also be understood that, by improving the position accuracy of the first heat exchange component 21 installation, the first heat exchange component 21 can more accurately provide better heat exchange effect for each position of the battery cell assembly 100, so that the large temperature difference of the battery cells 11 at different positions can be avoided, and the service life and reliability of the battery pack can be improved.

[0212] Please continue to refer to Figure 10 、 Figure 11 and Figure 12 One of the first positioning structure 32 and the second positioning structure 211 includes a first positioning hole 211a, and the other of the first positioning structure 32 and the second positioning structure 211 includes a first positioning column 321, and the first positioning column 321 is inserted into the first positioning hole 211a. Thus, during the installation process, the positioning of the first heat exchange component 21 can be conveniently and quickly realized by inserting the first positioning column 321 into the first positioning hole 211a, and the preliminary fixation of the first heat exchange component 21 can also be realized.

[0213] Of course, in some other embodiments, one of the first positioning structure 32 and the second positioning structure 211 includes a first positioning groove, and the other of the first positioning structure 32 and the second positioning structure 211 includes a first positioning rib, and the first positioning rib is engaged in the first positioning groove, and the embodiments of the present application are not limited thereto.

[0214] Hereinafter, the technical solutions of the embodiments of the present application will be exemplarily described in combination with the structure of the first positioning column 321 and the first positioning hole 211a.

[0215] In some embodiments, the first positioning structure 32 further comprises a positioning bracket 322. The positioning bracket 322 is mounted to the box body 300, and the first positioning column 321 is protruded from a side of the positioning bracket 322 facing the first heat exchange component 21. Then, in the actual assembly process, the first positioning column 321 can be arranged on the positioning bracket 322, so that the first positioning column 321 is more stably and reliably mounted to the box body 300 through the positioning bracket 322; and compared with the first positioning column 321 being integrally formed on the box body 300, the separate forming manner can reduce the forming difficulty of the first positioning column 321.

[0216] In some embodiments, the first positioning column 321 is provided with a first locking component 323, and the first heat exchange component 21 is locked between the first locking component 323 and the positioning bracket 322. Thus, after the first heat exchange component 21 is installed in place, the first heat exchange component 21 can be locked by the first locking component 323 to avoid displacement and falling off of the first heat exchange component 21 in the subsequent use process.

[0217] In addition, it can also be understood that the first positioning column 321 is used for positioning and guiding in the installation process of the first heat exchange component 21, and locking and fixing after the first heat exchange component 21 is installed in place, so that the number of parts of the battery pack as a whole can be reduced, so that the inside of the battery pack is more compact, thereby improving the energy density of the battery pack and reducing the assembly difficulty of the battery pack.

[0218] For example, the first positioning column 321 can be provided with external threads, and the first locking component 323 can be a nut, so that the first locking component 323 can be threadedly screwed to the first positioning column 321.

[0219] Please continue to refer to Figure 13 In some embodiments, the positioning bracket 322 can comprise a bracket bottom plate 3221, a bracket side plate 3222 and a bracket top plate 3223. The bracket bottom plate 3221 is connected and fixed with the box body 300. One end of the bracket side plate 3222 is connected and fixed with the bracket bottom plate 3221. The bracket top plate 3223 is connected to a side of the bracket side plate 3222 away from the bracket bottom plate 3221, and the bracket top plate 3223 is connected and fixed with the first positioning column 321.

[0220] Further, on the one hand, the positioning bracket 322 can increase the contact area with the box body 300 through the bracket bottom plate 3221, so as to be stably mounted to the box body 300; on the other hand, the positioning bracket 322 can also more stably support the first heat exchange component 21 through the bracket top plate 3223. On this basis, compared with the positioning bracket 322 adopting a solid block structure, the hollow structure of the bracket side plate 3222 connecting the bracket bottom plate 3221 and the bracket top plate 3223 can make the positioning bracket 322 more lightweight, so as to reduce the overall weight of the battery pack.

[0221] In some embodiments, the first positioning column 321 is riveted or welded to the bracket top plate 3223 to improve the stability and reliability of the installation of the first positioning column 321, thereby ensuring the stability and reliability of the installation of the first heat exchange component 21.

[0222] In some embodiments, the bracket bottom plate 3221 is provided with a first mounting hole 3224 facing the first positioning column 321. The hole diameter of the first mounting hole 3224 is greater than the maximum outer diameter of the first positioning column 321, so that the first positioning column 321 can be installed to the bracket top plate 3223 through the first mounting hole 3224.

[0223] For example, the bracket top plate 3223 is provided with a third mounting hole 3226 corresponding to the first mounting hole 3224, and the first positioning column 321 is arranged in the first mounting hole 3224.

[0224] Then, taking the riveting fixation of the first positioning column 321 as an example, first, the riveting equipment can clamp the bracket bottom plate 3221 to fix the positioning bracket 322; then, the riveting head of the riveting equipment can carry the first positioning column 321 through the first mounting hole 3224, and then rivet the first positioning column 321 to the third mounting hole 3226. Correspondingly, the first positioning column 321 can be a rivet bolt, such as a M5 size rivet bolt.

[0225] Continuing to take the welding fixation of the first positioning column 321 as an example, first, the welding equipment can clamp the bracket bottom plate 3221 to fix the positioning bracket 322; then, the welding equipment can drive the first positioning column 321 to pass through the first mounting hole 3224 until the first positioning column 321 is arranged in the third mounting hole 3226; finally, the welding head of the welding equipment welds the first positioning column 321 to the third mounting hole 3226. Correspondingly, the first positioning column 321 can be a projection welding bolt, such as a M5 size projection welding bolt.

[0226] Therefore, it can be seen that the bracket bottom plate 3221 of the embodiment of the present application makes the positioning bracket 322 have the advantage of easy clamping, so as to facilitate the clamping of the automatic equipment, and at the same time, through the third mounting hole 3226 on the bracket bottom plate 3221, the working head of the riveting equipment and the welding equipment and other automatic equipment can also have a good guiding and positioning effect, so that the working head of the automatic equipment accurately installs the first positioning column 321 to the positioning bracket 322, and finally improves the position accuracy of the positioning first heat exchange component 21 installation.

[0227] In some embodiments, the two ends of the length direction of the bracket bottom plate 3221 are provided with the second mounting holes 3225 to be fixedly installed to the box body 300, and the bracket side plate 3222 is located at the middle part of the length direction of the bracket bottom plate 3221. Thus, the bracket side plate 3222 and / or the bracket top wall connected to the bracket side plate 3222 can be avoided from interfering with the installation at the second mounting hole 3225. Moreover, since the two ends of the length direction of the bracket bottom plate 3221 are fixedly connected to the box body 300, the stress of the bracket base can be more uniform and reasonable.

[0228] In some embodiments, the bracket bottom plate 3221 can be riveted or screwed to the box body 300 through the second mounting hole 3225, for example, the bracket bottom plate 3221 can be riveted to the second mounting hole 3225 through a M5 size core-pulling rivet, and the present application does not limit this.

[0229] In some embodiments, the positioning bracket 322 can be an aluminum profile. For example, the positioning bracket 322 can be an aluminum extrusion formed by an extrusion process, and then processed by punching, punching and blanking, CNC (Computer numerical control machine tools, numerical control machine tools) processing and the like. Of course, the positioning bracket 322 can also be steel or any other material, and the present application does not limit this.

[0230] In some embodiments, the box body 300 is further provided with a mounting portion 33, the mounting portion 33 is located in the accommodation space, and the first positioning structure 32 is installed on the mounting portion 33. Thus, the connection between the first positioning structure 32 and the box body 300 can be avoided from being exposed, so as to ensure the stability and reliability of the first positioning structure 32.

[0231] For example, the mounting portion 33 can be protruded from the inner wall of the accommodation space, and the positioning bracket 322 (such as the bracket bottom plate 3221 of the positioning bracket 322) of the first positioning structure 32 is installed on the mounting portion 33.

[0232] The above is some example explanation of the connection mode of the first positioning column 321 and the box body 300 in the present application, and the present application will be further explained below in combination with the first positioning hole 211a.

[0233] In some embodiments, the number of first positioning holes 211a is at least two. It can be understood that if there is only one first positioning hole 211a, the first heat exchange component 21 still has the freedom of rotation around the axis of the first positioning column 321 after the first positioning column 321 is inserted into the first positioning hole 211a. Therefore, by providing at least two first positioning holes 211a in the present application, the rotational freedom of the first heat exchange component 21 can be limited, thereby further improving the position accuracy of the installation of the first heat exchange component 21.

[0234] In some embodiments, at least one first positioning hole 211a is a waist-shaped hole. Then, taking the case where the first positioning hole 211a is provided on the first heat exchange component 21 as an example, if there is a certain error in the distance between the two first positioning holes 211a during the machining process of the first heat exchange component 21, the first positioning column 321 corresponding to the waist-shaped hole can be inserted into different positions on the waist-shaped hole, so as to avoid that the first heat exchange component 21 cannot be installed.

[0235] In some embodiments, at least one first positioning hole 211a is a circular hole, so that the position accuracy of the installation of the first heat exchange component 21 can be ensured through the circular hole. The circular hole can be a circular hole with a diameter of φ7, or a circular hole with other sizes, which is not limited in the present application.

[0236] In some embodiments, the number of first positioning holes 211a can be two, so as to ensure the positioning accuracy of the first heat exchange component 21, and avoid the need to provide too many positioning supports 322 and first positioning columns 321, thereby increasing the cost of the battery pack and improving the installation difficulty.

[0237] In some embodiments, the first heat exchange component 21 is provided with a second positioning structure 211 at each end in the length direction. Therefore, during installation, the two ends of the first heat exchange component 21 can be well positioned, and after installation is completed, the two ends of the first heat exchange component 21 can be well fixed.

[0238] Please continue to refer to Figure 14 and Figure 15 In some embodiments, the box body 300 includes a plurality of sub-box bodies 31, and the plurality of sub-box bodies 31 are stacked along the first direction H1, and each sub-box body 31 is provided with one battery cell assembly 100.

[0239] Therefore, by stacking the plurality of sub-boxes 31, the number of cell assemblies 100 in the battery pack can be increased to improve the electrical energy storage capacity of the battery pack; and by installing part of the cell assemblies 100 in each of the plurality of sub-boxes 31, each sub-box 31 and the corresponding cell assembly 100 form a small unit or module during assembly, thereby reducing the difficulty of installing each small unit or module, and finally assembling a plurality of small units or modules to reduce the assembly difficulty of a large number of cell assemblies 100.

[0240] In some embodiments, along the first direction H1, one of the sub-boxes 31 at the outermost end is provided with a cover assembly 400, and the other sub-box 31 is provided with a bottom cover 500.

[0241] Please continue to refer to Figure 16 In some embodiments, the battery pack further comprises at least one connecting plate 600, and the outer walls of two adjacent sub-boxes 31 are connected by the connecting plate 600, so that the stability and reliability of the connection between the two adjacent sub-boxes 31 can be improved by the connecting plate 600.

[0242] The connecting plate 600 and the sub-box 31 can be fixed by screwing, riveting or welding, and the present application does not limit the fixing method.

[0243] In some embodiments, the outer wall of the sub-box 31 is provided with a fixing lug 311, and the fixing lugs 311 of two adjacent sub-boxes 31 are connected and fixed, so that the stability and reliability of the connection between the two adjacent sub-boxes 31 can be improved by the fixing lugs 311.

[0244] The fixing lugs 311 can be fixed by screwing, riveting or welding, and the present application does not limit the fixing method.

[0245] In some embodiments, of two adjacent fixing lugs 311, one fixing lug 311 is provided with a second positioning column 312, and the other fixing lug 311 is provided with a second positioning hole 313, and the second positioning column 312 is arranged in the second positioning hole 313 to improve the positioning accuracy of the installation of the two adjacent sub-boxes 31.

[0246] In some embodiments, the outer wall of the sub-box 31 is connected to the connecting plate 600 along at least one side of the second direction H2, and the outer wall of the sub-box 31 is provided with the fixing lug 311 along at least one side of the third direction H3. The first direction H1, the second direction H2 and the third direction H3 are perpendicular to each other.

[0247] For example, the first direction H1 can be the height direction of the battery pack, the second direction H2 can be the width direction of the battery pack, and the third direction H3 can be the length direction of the battery pack, so that each side surface of the two adjacent sub-boxes 31 can be stably and reliably connected and fixed. Of course, the specific directions of the first direction H1, the second direction H2 and the third direction H3 can be interchangeable, and the embodiments of the present application do not limit this.

[0248] The embodiments of the present application also provide a battery pack.

[0249] The power consumption equipment can be, but is not limited to, a vehicle, a smart wearable device, a mobile terminal, a household appliance and a medical instrument, and the embodiments of the present application do not limit this. The vehicle includes, but is not limited to, a car, a bus, a train, a ship, a flying device and the like. The smart wearable device includes, but is not limited to, a smart watch, a smart bracelet, a cervical vertebra massage instrument and the like. The mobile terminal includes, but is not limited to, a smart phone, a notebook computer, a tablet computer and a POS (point of sales terminal) machine. The household appliance includes, but is not limited to, a television, a washing machine, an air conditioner, an electric rice cooker, a smart sweeper and a smart lamp. The medical instrument includes, but is not limited to, an infrared electronic thermometer, a pulse oximeter and a human body composition analyzer.

[0250] The embodiments of the present application are described in detail above, and the specific examples are applied to the principle and implementation mode of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range can be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A battery pack, characterized by, The application relates to a battery pack, comprising: a plurality of battery cell assemblies arranged in a vertical direction, each of the battery cell assemblies comprising a plurality of battery cells, one side surface of the battery cells comprising a functional area and a non-functional area, the functional area being provided with at least one of an output pole, a liquid injection hole and an explosion-proof valve; and a heat exchange assembly comprising a first heat exchange component, a first support and a second support, the first heat exchange component being arranged on the side of the output pole of the battery cell, one side of the first support abutting against the first heat exchange component, the other side of the first support abutting against the non-functional area of the battery cell, and the second support being arranged between the first heat exchange component and the top battery cell assembly.

2. The battery pack of claim 1, wherein, The battery cell assembly comprises at least two rows of battery cells, and the first support overlaps with two adjacent rows of battery cells.

3. The battery pack of claim 2, wherein, Each battery cell assembly comprises a plurality of rows of battery cells, and the plurality of rows of battery cells in the same battery cell assembly are arranged in a second direction, which is the width direction of the first support, and each side of the first support overlaps with one row of battery cells. In the width direction of the first support, the width of the part of the first support overlapping with each row of battery cells is greater than or equal to 3 mm.

4. The battery pack of claim 1, wherein, The heat exchange assembly further comprises at least two second heat exchange components, and each battery cell assembly is provided with the second heat exchange component on the side away from the first heat exchange component for heat exchange. The second support is arranged between the first heat exchange component and the second heat exchange component.

5. The battery pack of claim 4, wherein, The structural strength of the second heat exchange component is greater than that of the first heat exchange component.

6. The battery pack of claim 5, wherein, The first heat exchange component comprises a stamping forming plate, and the stamping forming plate forms a flow channel for the cooling medium. The second heat exchange component comprises an extrusion forming plate, and the extrusion forming plate forms a flow channel for the cooling medium.

7. The battery pack of claim 5, wherein, The thickness of the second heat exchange component is greater than that of the first heat exchange component.

8. The battery pack of claim 4, wherein, The first support and / or the second support abut against the non-flow channel area of the adjacent first heat exchange component.

9. The battery pack of claim 4, wherein, The second support comprises a first buffer layer, and the first buffer layer abuts against the second heat exchange component.

10. The battery pack of claim 4, wherein, In the vertical direction, the height of the second support protruding from the connected first heat exchange component is greater than or equal to 2 mm. In the vertical direction, the gap between two adjacent battery cell assemblies is D1, the height of the second support is D2, and the ratio of D1 to D2 is 13:4 to 13:5; and / or In the vertical direction, the gap between two adjacent battery cell assemblies is D1, the sum of the height of the two adjacent battery cell assemblies and the gap between the two adjacent battery cell assemblies is D3, and the ratio of D1 to D3 is 3:20 to 1:15; and / or In the vertical direction, the gap between two adjacent battery cell assemblies is D1, the height of the first support is D4, and the ratio of D1 to D4 is 13:6 to 13:

7.

11. The battery pack of claim 4, wherein, The first support and / or the second support is a strip-shaped support.

12. The battery pack of claim 1, wherein, The heat exchange assembly further comprises a third support member, which is arranged in the first heat exchange component to be clamped between two adjacent battery cell assemblies.

13. The battery pack of claim 1, wherein, The number of the battery cell assemblies is at least two, and all the battery cell assemblies are arranged along a first direction; each battery cell assembly comprises a plurality of columns of battery cells, the columns of battery cells in the same battery cell assembly are arranged along a second direction, and the battery cells in the same column are arranged along a third direction, and the first direction, the second direction and the third direction intersect with each other; The number of the first support members is multiple, and at least two first support members are arranged along the second direction, and each first support member extends along the third direction.

14. The battery pack of claim 13, wherein, The battery cell assemblies comprise a plurality of columns of battery cells, the columns of battery cells in the same battery cell assembly are arranged along a second direction, and the battery cells in the same column are arranged along a third direction, and the third direction is the length direction of the first support member, the first support member extends along the length direction of the battery cell assembly, and the ratio of the length of the first support member to the length of the battery cell assembly is greater than or equal to three-fifths.

15. The battery pack of any one of claims 1-12, wherein, The battery pack comprises a plurality of sub-boxes, and all the sub-boxes are stacked along a first direction, and each sub-box is provided with one battery cell assembly.

16. The battery pack of any one of claims 1 to 14, wherein, The battery cell assembly further comprises a busbar, and the battery cells are electrically connected to the busbar.

17. The battery pack of any one of claims 1 to 14, wherein, The first heat exchange component is connected to the pole or the busbar of the adjacent battery cell assembly through a heat-conducting adhesive. The battery pack comprises a plurality of sub-boxes, and all the sub-boxes are stacked along a first direction, and each sub-box is provided with one battery cell assembly.

18. An electrical device, characterized by The battery cell assembly further comprises a busbar, and the battery cells are electrically connected to the busbar. The first heat exchange component is connected to the pole or the busbar of the adjacent battery cell assembly through a heat-conducting adhesive. The battery pack comprises a plurality of sub-boxes, and all the sub-boxes are stacked along a first direction, and each sub-box is provided with one battery cell assembly.

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