Battery pack and electric automobile

Abstract

According to the battery pack, a supporting piece is arranged in a box body, the first end, in the third direction, of the supporting piece is connected with the first wall of the box body, and the second end, in the third direction, of the supporting piece is connected with the second wall of the box body; therefore, the first wall and the second wall of the box body are connected into a whole through the supporting piece, the overall mode of the battery pack is improved, the overall strength of the battery pack is improved, the supporting piece is arranged between every two adjacent battery monomers, a cross beam does not need to be arranged in the box body, and a mounting point arranged in the middle area of the box body is combined; deformation generated by vibration of the battery pack can be effectively reduced, the overall rigidity of the battery pack can be guaranteed, excessive space in the box body cannot be occupied, and the volume utilization rate in the box body is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery pack and an electric vehicle. Background Art

[0002] The battery pack in an electric vehicle is fixed to the vehicle bracket through mounting points, but the fixing point of the whole pack is located at the battery pack frame. There is a lack of mounting points in the center area of ​​the battery pack, which leads to large deformation in the center area of ​​the battery pack. To set the mounting points in the center area of ​​the battery pack, it is necessary to set a beam structure in the box, which leads to a decrease in the internal volume utilization of the box, affecting the energy density of the battery pack and hindering lightweighting. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electric vehicle to solve the problem that the mounting point of the current battery pack is set in the central area, resulting in a decrease in the volume utilization rate of the box.

[0004] A first aspect of an embodiment of the present application provides a battery pack, comprising: a box body, the box body having a first direction and a third direction intersecting each other, the box body comprising a first wall and a second wall arranged opposite to each other along the third direction, and a accommodating cavity being provided in the box body; a plurality of battery cells arranged in the accommodating cavity, the plurality of battery cells being arranged at least along the first direction; a support member arranged in the accommodating cavity, the support member being arranged between two adjacent battery cells in the first direction, the support member comprising a first end and a second end arranged opposite to each other along the third direction; wherein the first end is connected to the first wall, and the second end is connected to the second wall.

[0005] Optionally, the battery cell includes a first surface and a second surface arranged opposite to each other along the third direction; in the third direction, the first surface is adjacent to the first wall, the second surface is adjacent to the second wall, and there is a gap between the first wall and the first surface.

[0006] Optionally, in the third direction, the second surface abuts against the second wall.

[0007] Optionally, the box body also has a second direction, and the first direction, the second direction and the third direction intersect each other; the battery pack also includes a pressure strip, which extends along the first direction and is arranged in the gap, and the pressure strip includes a first contact surface and a second contact surface that are relatively arranged along the third direction; the first contact surface abuts against the first surfaces of two adjacent battery cells in the second direction, and along the third direction, the second contact surface abuts against the first wall or there is a gap.

[0008] Optionally, the box body also has a second direction, and the first direction, the second direction and the third direction intersect each other; the battery pack also includes a pressure strip, which extends along the first direction and is arranged in the gap, and the pressure strip includes a first contact surface and a second contact surface that are oppositely arranged along the third direction; the first end is provided with a recessed portion at one end of the battery cell adjacent to the first direction, and the recessed portion has a wall surface, and the wall surface is oppositely arranged to the first wall along the third direction, and the first contact surface abuts against the first surface and the wall surface adjacent to the second direction; along the third direction, the second contact surface abuts against the first wall, or there is a gap between the second contact surface and the first wall.

[0009] Optionally, the battery pack also includes a connecting layer; the battery cell includes a third side wall and a fourth side wall arranged opposite to each other along a second direction; the support member includes a first side surface and a second side surface arranged opposite to each other along the second direction; the connecting layer is arranged between the first side surface and the fourth side wall adjacent to each other in the second direction, and the connecting layer connects the first side surface and the fourth side wall; and / or the connecting layer is arranged between the second side surface and the third side wall adjacent to each other in the second direction, and the connecting layer connects the second side surface and the third side wall.

[0010] Optionally, along the third direction, the size of the support member is L mm, and the size of the battery cell is H mm, satisfying: 1<L / H≤1.3.

[0011] Optionally, the battery pack also includes a mounting assembly, the mounting assembly includes a fastener, the fastener is arranged on a side of the second wall facing away from the first wall in the third direction; along the third direction on a plane perpendicular to the third direction, the orthographic projection of the fastener falls within the orthographic projection of the second end.

[0012] Optionally, the mounting assembly further includes a carrier plate, which extends along the second direction and is arranged on a side of the second wall facing away from the first wall in the third direction; the fastener is inserted into the carrier plate, and at least one fastener is arranged on each carrier plate.

[0013] Optionally, the battery pack also includes a fixing member, a first end of the supporting member is provided with a socket, the socket extends along the third direction, and the first wall is provided with a first plugging hole arranged opposite to the socket along the third direction; the fixing member is inserted into the first plugging hole and the socket and connects the supporting member and the first wall.

[0014] Optionally, the socket passes through the support member along the third direction, and the second wall is provided with a second socket hole which is arranged opposite to the socket along the third direction; the fixing member is inserted in the first socket hole and the socket and connects the support member and the first wall, and the fixing member is inserted in the socket and the second socket hole and connects the support member and the second wall; or, the fixing member includes a first fixing member and a second fixing member, the first fixing member is inserted in the first socket hole and the socket and connects the support member and the first wall, and the second fixing member is inserted in the second socket hole and the socket and connects the support member and the second wall.

[0015] Optionally, a cavity is provided inside the support member.

[0016] A second aspect of an embodiment of the present application provides an electric vehicle, comprising a battery pack as described above.

[0017] In summary, the embodiments of the present application provide a battery pack and an electric vehicle having the battery pack, wherein the battery pack is provided with a support member in a box body, and the first end of the support member in the third direction is connected to the first wall of the box body, and the second end of the support member in the third direction is connected to the second wall of the box body, so that the first wall and the second wall of the box body are connected to form a whole through the support member, thereby improving the overall mode of the battery pack and improving the overall strength of the battery pack. Moreover, the support member is provided between two adjacent battery cells, and there is no need to provide a cross beam in the box body. Combined with the mounting point provided in the middle area of ​​the box body, the deformation caused by the vibration of the battery pack can be effectively reduced, thereby ensuring the overall rigidity of the battery pack, and will not occupy too much space in the box body, thereby improving the volume utilization rate inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the 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 work.

[0019] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 Exploded diagram of

[0021] Figure 3 yes Figure 1 AA section view;

[0022] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at B;

[0023] Figure 5 It is a first angle structural schematic diagram of the mounting assembly, battery cell and liquid cooling plate combination in the battery pack provided in the embodiment of the present application;

[0024] Figure 6 It is a second angle structural schematic diagram of the mounting assembly, battery cell and liquid cooling plate combination in the battery pack provided in the embodiment of the present application;

[0025] Figure 7 is a schematic diagram of the structure of a support member in a battery pack provided in an embodiment of the present application;

[0026] Figure 8 It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0027] Description of main reference numerals:

[0028] 1. battery pack, 10. box body, 101. accommodating cavity, 11. first wall, 110. gap, 111. first plug hole, 12. second wall, 13. pressure strip, 131. first contact surface, 132. second contact surface, 14. frame;

[0029] 20. Battery cell, 21. First surface, 22. Second surface, 23. First side wall, 24. Second side wall, 25. Third side wall, 26. Fourth side wall, 27. Post, 28. Explosion-proof valve;

[0030] 30. Support member, 301. First surface, 302. Second surface, 303. First side surface, 304. Second side surface, 31. First end, 310. Recessed portion, 3101. Wall surface, 311. Insertion hole, 32. Second end, 33. Connecting layer, 34. Fixing member, 35. Gasket;

[0031] 40. mounting assembly, 41. fastener, 42. carrier board, 43. welding point;

[0032] 50. liquid cooling assembly, 51. liquid cooling plate, 52. liquid cooling pipe;

[0033] 60. Adhesive layer;

[0034] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

[0040] This embodiment provides an electric vehicle, including a battery pack.

[0041] In some embodiments, a battery pack 1 is provided, referring to Figure 1 to Figure 7 The battery pack 1 includes: a box body 10, a battery cell 20 and a support member 30.

[0042] In some embodiments, the box 10 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figure 1 to Figure 4 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other. The box body 10 includes a first wall 11 and a second wall 12 oppositely arranged along the third direction Z. An accommodating cavity 101 is provided in the box body 10 .

[0043] In some embodiments, reference Figure 2 to Figure 6 as well as Figure 8 The number of battery cells 20 is multiple, and the multiple battery cells 20 are disposed in the accommodating cavity 101. The multiple battery cells 20 are arranged at least along the first direction X. Figure 2 to Figure 6 In the illustrated embodiment, a plurality of battery cells 20 are arranged in a first direction X to form a column, and a plurality of columns of battery cells 20 are arranged in a second direction Y to form a plurality of rows. Figure 8 The battery cell 20 is a square battery. The battery cell 20 includes a first side wall 23 and a second side wall 24 arranged oppositely along a first direction X, a third side wall 25 and a fourth side wall 26 arranged oppositely along a second direction Y, and a first surface 21 and a second surface 22 arranged oppositely along a third direction Z. The first side wall 23, the third side wall 25, the second side wall 24 and the fourth side wall 26 enclose a shell having two open ends along the third direction Z. The first surface 21 and the second surface 22 respectively cover the two open ends of the shell in the third direction Z. The first side wall 23 and the second side wall 24 are the surfaces with the largest surface areas. Figure 8 In the illustrated embodiment, the battery cell 20 further includes a pole 27 and an explosion-proof valve 28 , and the pole 27 and the explosion-proof valve 28 are arranged on the first surface 21 at intervals.

[0044] In some embodiments, reference Figure 2 to Figure 4 as well as Figure 7 The support member 30 is arranged in the accommodating cavity 101. Specifically, the support member 30 is arranged between two adjacent battery cells 20 in the first direction X. The support member 30 includes a first end 31 and a second end 32 that are relatively arranged along the third direction Z. The first end 31 is connected to the first wall 11 of the box body 10, and the second end 32 is connected to the second wall 12 of the box body 10, thereby connecting the first wall 11 and the second wall 12 of the box body 10 in the third direction Z to form a whole.

[0045] The battery pack in an existing electric vehicle is fixedly assembled with a vehicle bracket through a mounting point. If the mounting point is set in the central area of ​​the battery pack box, in order to improve the assembly firmness of the battery pack and the bracket, a crossbeam needs to be provided in the box. The provision of the crossbeam leads to a decrease in the utilization rate of the internal volume of the box, which hinders the lightweighting of the battery pack.

[0046] The battery pack 1 provided in the embodiment of the present application is provided with a support member 30 in the accommodating cavity 101 of the box body 10, and the first end 31 of the support member 30 in the third direction Z is connected to the first wall 11 of the box body 10, and the second end 32 in the third direction Z is connected to the second wall 12 of the box body 10, so that the first wall 11 and the second wall 12 of the box body 10 are connected to form a whole through the support member 30, thereby improving the overall stiffness of the box body 10 in the third direction Z and the overall mode of the battery pack 1, and the support member 30 is arranged between two adjacent battery cells 20 in the first direction X, thereby eliminating the arrangement of the crossbeam in the box body 10 while ensuring the overall stiffness of the box body 10, and the support member 30 is combined with the mounting point arranged in the middle area of ​​the box body, which can effectively reduce the deformation caused by the vibration of the battery pack, and improve the volume utilization rate in the box body 10 while ensuring the overall height of the battery pack 1, and when the battery pack 1 can withstand a large external force, the support member 30 can support the battery pack 1 to prevent it from deformation.

[0047] In some embodiments, reference Figure 2 and Figure 8 The shape of the support member 30 is compatible with the shape of the battery cell 20. The overall shape of the support member 30 is square. The support member 30 includes a first surface 301 and a second surface 302 that are oppositely arranged along the first direction X. In the first direction X, the first surface 301 abuts against the adjacent first side wall 23, and the second surface 302 abuts against the adjacent second side wall 24.

[0048] In some embodiments, reference Figures 4 to 6 as well as Figure 8 In the third direction Z, the first surface 21 of the battery cell 20 is adjacent to the first wall 11 of the box body 10, and the second surface 22 of the battery cell 20 is adjacent to the second wall 12. Figure 3 and Figure 4 There is a gap 110 between the first wall 11 and the first surface 21 in the third direction Z. The pole 27 and the explosion-proof valve 28 of the battery cell 20 are arranged on the first surface 21 of the battery cell 20. The setting of the gap 110 can provide a wiring space for the pole 27 and a pressure relief and exhaust space for the explosion-proof valve 28. Moreover, the setting of the gap 110 can reserve a bottom ball hitting space for one end of the inner side of the accommodating cavity 101 close to the first wall 11, thereby reducing the size of the entire battery pack 1 in the third direction Z to meet more usage conditions.

[0049] In some embodiments, reference Figure 4 In the third direction Z, the second surface 22 of the battery cell 20 abuts against the second wall 12 of the box body 10 , thereby improving the stability of the assembly of the battery cell 20 and the box body 10 in the third direction Z.

[0050] In some embodiments, reference Figure 2 to Figure 6 The battery pack 1 also includes a pressure strip 13, which extends along the first direction X. There are multiple pressure strips 13, which are arranged at intervals along the second direction Y. The pressure strip 13 is arranged in the accommodating cavity 101. Specifically, the pressure strip 13 is arranged in the gap 110 defined by the first wall 11 and the first surface 21. The pressure strip 13 includes a first contact surface 131 and a second contact surface 132 that are arranged opposite to each other along the third direction Z.

[0051] In some embodiments, reference Figure 3 The first contact surface 131 abuts against the first surfaces 21 of two battery cells 20 adjacent to each other in the second direction Y, that is, the first contact surface 131 of the pressure strip 13 is pressed at the junction between the two first surfaces 21 adjacent to each other in the second direction Y, thereby pressing the two battery cells 20 adjacent to each other in the second direction Y, ensuring the tightness of the battery cells 20 in the second direction Y and improving the volume utilization rate in the box body 10.

[0052] In some embodiments, reference Figure 4 and Figure 7 The first end 31 of the support member 30 is provided with a recessed portion 310 adjacent to one end of the battery cell 20 in the first direction X. The recessed portion 310 is provided so that the first end 31 forms a two-stage stepped structure. The recessed portion 310 has a wall surface 3101. The wall surface 3101 is arranged opposite to the first wall 11 along the third direction Z. Figure 4 The first contact surface 131 of the pressure strip 13 abuts against the first surface 21 of the battery cell 20 adjacent to the second direction Y and the wall surface 3101, that is, the first contact surface 131 of the pressure strip 13 is pressed at the junction of the first surface 21 and the wall surface 3101 adjacent to the second direction Y, thereby ensuring the tightness of the assembly between the battery cell 20 and the support member 30 and improving the volume utilization rate in the box body 10.

[0053] In some embodiments, the second contact surface 132 abuts against the first wall 11 to improve the overall modality of the battery pack.

[0054] In other embodiments, reference Figure 4 There is a gap between the second contact surface 132 and the first wall 11 , so that a buffer space is formed between the pressure strip 13 and the first wall 11 to prevent the external force on the first wall 11 from being transmitted to the battery cell 20 through the pressure strip 13 and causing damage to the battery cell 20 .

[0055] In some embodiments, reference Figure 4 The battery pack 1 also includes a connecting layer 33, referring to Figure 4 and Figure 7 The support member 30 includes a first side surface 303 and a second side surface 304 arranged opposite to each other along the second direction Y. Figure 3 In two battery cells 20 adjacent to each other in the second direction Y, a connecting layer 33 is provided between the third side wall 25 of one battery cell 20 and the fourth side wall 26 of the other battery cell 20. The provision of the connecting layer 33 can ensure the tightness of the connection between the two adjacent battery cells 20, thereby ensuring the assembly firmness between the multiple battery cells 20.

[0056] In some embodiments, reference Figure 4 A connecting layer 33 is arranged between the battery cells 20 and the support member 30 adjacent to each other in the second direction. Specifically, a connecting layer 33 is arranged between the first side surface 303 of the support member 30 and the fourth side wall 26 of the battery cell 20, and the connecting layer 33 connects the fourth side wall 26 and the first side surface 303. In addition, a connecting layer 33 is arranged between the second side surface 304 of the support member 30 and the third side wall 25 of the battery cell 20, and the connecting layer 33 connects the second side surface 304 and the third side wall 25. The arrangement of the connecting layer 33 can ensure the firmness and stability of the connection between the battery cell 20 and the support member 30.

[0057] In some embodiments, the connection layer 33 can be various types of glue, such as structural glue, etc., which can better achieve force conduction between the support member 30 and the battery cell 20, so that the overall module forms a whole, which can effectively improve the mode of the battery pack 1.

[0058] In some embodiments, the connecting layer 33 can also be foam glue or potting glue, etc. The potting glue or foam glue can be directly placed in the accommodating cavity 101 of the box body 10. After the foam glue or potting glue is completely cured and the pole piece is foamed and formed, multiple battery cells 20 and the support member 30 can be fixed together.

[0059] In some embodiments, along the third direction Z, reference Figure 7, the size of the support member 30 is L mm, that is, the distance between the end face of the first end 31 of the support member 30 and the end face of the second end 32 in the third direction Z is L mm, the size of the battery cell 20 is H mm, that is, the distance between the end face of the pole 27 of the battery cell 20 at the end away from the first face 21 in the third direction Z and the second face 22 in the third direction Z is H mm, and it satisfies: 1<L / H≤1.3, specifically, the value of L / H can be any value among 1.05, 1.1, 1.12, 1.15, 1.2, 1.25 and 1.3 or a range value between any two values. When the value of L / H is within the above range, the support member 30 can effectively connect the first wall 11 and the second wall 12 of the box body 10, ensure the rigidity of the box body 10 in the third direction Z, and make the box body 10 have a higher volume utilization rate.

[0060] In some other embodiments, the battery pack may also satisfy: 0<L / H<1, that is, the height L of the support member 30 in the third direction Z is less than the height of the battery cell 20 in the third direction Z. In this case, a first protrusion (not shown in the figure) corresponding to the first end 31 of the support member 30 is provided on the first wall 11, and the first end 31 is connected to the first protrusion, and a second protrusion (not shown in the figure) corresponding to the second end 32 may also be provided on the second wall 12, and the second end 32 is connected to the second protrusion.

[0061] In some embodiments, the battery cell 20 is a cylindrical battery, and the shapes of the first surface 301 and the second surface 302 of the support member 30 match the sidewalls of the battery cell 20 .

[0062] In some embodiments, reference Figure 1 to Figure 5 The battery pack 1 also includes a mounting assembly 40, which includes a fastener 41. The fastener 41 is arranged on a side of the second wall 12 away from the first wall 11 in the third direction Z. On a plane perpendicular to the third direction Z along the third direction Z, the orthographic projection of the fastener 41 falls within the orthographic projection of the second end 32. The battery pack 1 is mounted on the whole vehicle bracket of the electric vehicle through the fastener 41. The fastener 41 extends along the third direction Z. The support member 30 connects the first wall 11 and the second wall 12 of the box body 10 in the third direction Z to form a whole body, so as to ensure the rigidity of the box body 10 in the third direction Z. The orthographic projection of the fastener 41 in the third direction Z falls within the end surface of the second end 32 of the support member 30, so that when the mounting assembly 40 is assembled with the whole vehicle bracket through the fastener 41, the deformation of the mounting point caused by the vibration of the battery pack 1 is reduced, and the stability of the assembly of the battery pack 1 with the whole vehicle bracket is ensured.

[0063] In some embodiments, reference Figure 1 to Figure 5The mounting assembly 40 further includes a carrier plate 42, the carrier plate 42 extends along the second direction Y, and the carrier plate 42 is disposed on a side of the second wall 12 away from the first wall 11 in the third direction Z; a fastener 41 is inserted into the carrier plate 42, and each carrier plate 42 is provided with at least one fastener 41, as shown in FIG. Figure 1-2 as well as Figure 5 In the embodiment shown, two fasteners 41 are provided on each carrier plate 42, which are arranged at intervals along the second direction Y. The number of carrier plates 42 in the battery pack 1 is three, which are arranged at intervals along the first direction X. Figure 1 to Figure 5 In the illustrated embodiment, the mounting assembly 40 further includes welding points 43 , and the carrier plate 42 is welded and fixed to the second wall 12 of the box body 10 via the welding points 43 , thereby ensuring the stability and firmness of the assembly between the mounting assembly 40 and the box body 10 .

[0064] In some embodiments, reference Figure 2 The support members 30 are evenly and symmetrically distributed in the accommodating cavity 101 of the battery pack 1 box 10. The number of fasteners 41 and support members 30 corresponds one to one, so that the support members 30 can better distribute the force of the mounting assembly 40 and optimize the force of the whole pack. A small area is formed between multiple support members 30. In this way, the entire battery pack 1 is divided into multiple small areas by the multiple support members 30. When the whole pack is affected by the vibration source, the overall strength is better, the amplitude is smaller, and the mode is better. In the specific implementation, the number of support members 30 can be set according to the strength requirements of the battery pack 1.

[0065] In some embodiments, the number of support members 30 is more than two, and the more than two support members 30 are arranged at intervals from each other. The more than two support members 30 can be evenly arranged in the middle area of ​​the battery pack 1 case 10 to strengthen the strength of the middle area of ​​the battery pack 1 case 10, wherein the middle area of ​​the case 10 is the middle area in the plane direction of the second wall 12 or the middle area in the plane direction of the first wall 11. By providing more than two support members 30, the connection strength between the first wall 11 and the second wall 12 can be further guaranteed. At the same time, the more than two support members 30 can provide multiple mounting sites for the connection between the battery pack 1 and the vehicle, further improving the stability of the installation of the battery pack 1 and the vehicle, and improving the safety performance of the vehicle. In some embodiments, the number of support members 30 is three, four, five or even more.

[0066] In some embodiments, reference Figure 3-4 as well as Figure 7 The battery pack 1 further includes a fixing member 34. The first end 31 of the supporting member 30 is provided with a plug hole 311, and the plug hole 311 extends along the third direction Z. Figure 3-4 as well as Figure 7In the illustrated embodiment, the socket 311 is a blind hole, and a first plugging hole 111 is provided on the first wall 11 and is arranged opposite to the socket 311 along the third direction Z. The fixing member 34 is inserted into the first plugging hole 111 and the socket 311 and connects the support member 30 and the first wall 11, thereby fixing the first end 31 of the support member 30 to the first wall 11, and ensuring the firmness of the connection between the first end 31 of the support member 30 and the first wall 11.

[0067] In some embodiments, reference Figure 3-4 The battery pack 1 further includes an adhesive layer 60 , which is disposed between the first wall 11 and the second surface 22 of the battery cell 20 , thereby ensuring the stability and firmness of the connection and assembly between the battery cell 20 and the support member 30 and the second wall 12 .

[0068] In some embodiments, reference Figure 4 One end of the connecting layer 33 close to the second wall 12 in the third direction Z abuts against the adhesive layer 60 , and one end of the connecting layer 33 close to the first wall 11 in the third direction Z abuts against the pressure strip 13 .

[0069] In some embodiments, the first plug hole 111 penetrates the support member 30 along the third direction Z to form a through hole structure, and a second plug hole (not shown in the figure) is opened on the second wall 12 and is arranged opposite to the first plug hole 111 along the third direction Z. The fixing member 34 is inserted into the first plug hole 111 and the plug hole 311 and connects the support member 30 and the first wall 11. The fixing member 34 is inserted into the plug hole 311 and the second plug hole and connects the support member 30 and the second wall 12.

[0070] In some embodiments, the number of fixing members 34 is two, including a first fixing member (not shown in the figure) and a second fixing member (not shown in the figure), the first fixing member is inserted into the first plug hole 111 and the plug hole 311 and connects the support member 30 and the first wall 11, and the second fixing member is inserted into the second plug hole and the plug hole 311 and connects the support member 30 and the second wall 12.

[0071] In some embodiments, a cavity is provided in the support member 30 . The provision of the cavity forms a hollow structure of the support member 30 , which can reduce the overall weight of the support member 30 and further reduce the weight of the entire battery pack 1 .

[0072] In some embodiments, reinforcing ribs are provided on the support member 30 to increase the strength of the support member 30 , ensure the connection strength of the support member 30 to the first wall 11 and the second wall 12 , and ensure the rigidity of the box body 10 .

[0073] In some embodiments, the support member 30 can be made of metal or non-metal. When a metal material is used, insulation treatment needs to be performed.

[0074] In some embodiments, a gasket 35 is provided at the connection between the support member 30 and the first wall 11 , and the gasket 35 is sleeved on one end of the fixing member 34 close to the first wall 11 in the third direction Z to prevent the fixing member 34 from causing wear to the first wall 11 .

[0075] In some embodiments, a seal (not shown in the figure) is provided at the connection between the support member 30 and the second wall 12. When the support member 30 is connected to the first wall 11 and the second wall 12 through the fixing member 34, the seal can achieve sealing at the connection to ensure the sealing performance of the entire package.

[0076] In some embodiments, the distribution position of the support member 30 in the box 10 of the battery pack 1 can be adjusted according to the overall design of the battery pack 1: according to the arrangement and weight distribution of the battery cells 20 in the battery pack 1, the position, distribution and number of the fasteners 41 (i.e., the hanging points) in the mounting assembly 40 of the support member 30 are determined by hanging point calculation, computer-aided calculation (topology optimization), etc. The adjustment is flexible and variable, and the practicability is high. Compared with the traditional battery pack in which the hanging points are set at the frame position, the degree of restriction of the frame of the box 10 is low.

[0077] In some embodiments, reference Figure 2-3 as well as Figure 5-6 The battery pack 1 also includes a liquid cooling assembly 50, which includes a liquid cooling plate 51 and a liquid cooling tube 52. The liquid cooling plate 51 extends along the first direction X, and multiple liquid cooling plates 51 are arranged at intervals along the second direction Y. Liquid cooling tubes 52 are respectively provided at both ends of the liquid cooling plate 51 in the first direction X, and a battery cell 20 is provided between two adjacent liquid cooling plates 51 in the second direction Y.

[0078] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0079] Example 1

[0080] A battery pack is provided, including a box body 10, the box body 10 includes a first wall 11 and a second wall 12 arranged oppositely along a third direction Z, a plurality of battery cells 20 are arranged in the box body 10, the plurality of battery cells 20 are arranged in a row along a first direction X, and a plurality of rows of battery cells 20 are arranged in a plurality of rows along a second direction Y. The battery cells 20 include a first surface 21 and a second surface 22 arranged oppositely along the third direction Z, a pole 27 and an explosion-proof valve 28 of the battery cells 20 are arranged at intervals on the first surface 21, a support member 30 is arranged between two adjacent battery cells 20 in the first direction X, the support member 30 includes a first end 31 and a second end 32 arranged oppositely along the third direction Z, the first end 31 is connected to the first wall 11 of the box body 10, and the second end 32 is connected to the second wall 12 of the box body 10.

[0081] Along the third direction Z, the distance L between the end surface of the first end 31 and the end surface of the second end 32 of the support member 30 in the third direction Z is 110 mm, and the dimension H of the battery cell 20 (including the pole) in the third direction Z is 105 mm, satisfying: L / H=1.05.

[0082] Example 2

[0083] A battery pack as described in Example 1 is provided, which is the same as Example 1 except for the following differences:

[0084] L is 118mm, H is 105mm, L / H=1.12.

[0085] Example 3

[0086] A battery pack as described in Example 1 is provided, which is the same as Example 1 except for the following differences:

[0087] L is 126mm, H is 105mm, L / H=1.2.

[0088] Example 4

[0089] A battery pack as described in Example 1 is provided, which is the same as Example 1 except for the following differences:

[0090] L is 135mm, H is 105mm, L / H=1.3.

[0091] Example 5

[0092] A battery pack as described in Example 1 is provided, which is the same as Example 1 except for the following differences:

[0093] L is 110mm, H is 97mm, L / H=1.4.

[0094] Example 6

[0095] A battery pack as described in Example 1 is provided, which is the same as Example 1 except for the following differences:

[0096] L is 118mm, H is 97mm, L / H=1.22.

[0097] Example 7

[0098] A battery pack as described in Example 1 is provided, which is the same as Example 6 except for the following differences:

[0099] L is 126mm, H is 97mm, L / H=1.30.

[0100] Example 8

[0101] A battery pack as described in Example 1 is provided, which is the same as Example 1 except for the following differences:

[0102] L is 145mm, H is 105mm, L / H=1.38.

[0103] Example 9

[0104] A battery pack as described in Example 1 is provided, which is the same as Example 1 except for the following differences:

[0105] L is 135mm, H is 97mm, L / H=1.39.

[0106] Test method for volume utilization of battery pack:

[0107] (1) Take the battery packs provided in Examples 1 to 9 and use depth measurement tools, such as a height measuring instrument, a laser rangefinder, etc., to measure the height measurement value of the inner cavity of the box body 10 of the battery pack along the third direction Z;

[0108] (2) Using a length measuring tool, such as a ruler, a tape measure, or a measuring tape, measure the length of the inner cavity of the box body 10 along the first direction X and the width along the second direction Y, and calculate the bottom area measurement value;

[0109] (3) Calculating the volume measurement value of the inner cavity of the box body 10 using the height measurement value and the bottom area measurement value;

[0110] (4) Repeating steps (1) to (3) can measure multiple different positions of the inner cavity of the box body 10 to obtain multiple volume measurement values. The average of the multiple volume measurement values ​​can be calculated to obtain the volume V1 of the inner cavity of the box body 10; Optionally, when executing step (1), the heights h1 and h2 are measured at two diagonal positions close to the inner cavity of the box body 10, and the height h3 is measured at a position close to the center of the inner cavity of the box body 10; When executing step (2), the dimensions of the two side panels of the box body 10 arranged opposite to each other along the first direction X in the second direction Y are selected as the two side panels. The width dimension data M1 and M2 are selected, and the midpoint between the two is selected as the measuring point to obtain the width dimension data M3; the dimensions of the two side panels of the box body 10 relatively arranged along the second direction Y in the first direction X are selected as the two length dimension data N1 and N2, and the midpoint between the two is selected as the measuring point to obtain the length dimension data N3; the bottom area S is: M1×N1, M2×N2, M3×N3, and the three volume values ​​are: M1×N1×h1, M2×N2×h2, M3×N3×h3, and the average of the three volume values ​​is obtained to obtain V1.

[0111] (5) Use a ruler or other length measuring tool to measure the length, width, height (excluding the pole height at this time) and other dimensions of the battery cell 20 multiple times and take the average value, and use the average value of the length, width, height and other dimensions to calculate the volume measurement value of the battery cell 20; optionally, measure the dimensions of the two width sides of the battery cell 20 and take the average value, measure the dimensions of the two length sides and take the average value, and measure the height dimensions at both ends of the length direction and take the average value.

[0112] (6) Multiplying the volume measurement value of the battery cell 20 by the number of battery cells 20 contained in the battery pack 1 to obtain the total volume V2 of all battery cells 20;

[0113] (7) Volume utilization rate = V2 / V1. Please refer to Table 1 for the test results.

[0114] Table 1

[0115]

[0116] It can be seen from Table 1 that, referring to Examples 1 to 7, when the dimension H of the battery cell 20 in the third direction Z remains unchanged, as the dimension L of the support member 30 in the third direction Z increases, the volume utilization rate of the battery pack 1 shows a downward trend. The reason is that the dimension L of the support member 30 in the third direction Z is too large compared to the dimension H of the battery cell 20 in the third direction Z, so that the interval between the battery cell 20 and the first wall 11 or the second wall 12 of the box body 10 is too large, resulting in excessive waste of this part of the space in the box body 10, thereby causing the volume utilization rate of the box body 10 of the battery pack 1 to show a downward trend. However, in the battery pack 1 provided in Examples 1 to 7, the value of L / H is within the range of 1<L / H≤1.3 defined in the present application, so that the volume utilization rate of the box body 10 is relatively high and can be maintained in the range of 50.0% to 65.5%.

[0117] In contrast, in Examples 8 to 9, the L / H value in the battery packs provided in Examples 8 to 9 exceeds the upper limit of 1<L / H≤1.3 specified in the present application. Specifically, the L / H value in the battery pack provided in Example 8 is 1.38, resulting in a volume utilization rate of the box body of only 44.4%; the L / H value in the battery pack provided in Example 9 is 1.39, resulting in a volume utilization rate of the box body of only 43.9%, both of which are significantly lower than the volume utilization rate of the box body 10 in the battery pack 1 provided in the embodiments of the present application, indicating that the support members in the battery packs provided in Examples 8 to 9 occupy too much space in the box body, which has a significant impact on the number distribution of battery cells in the battery pack; when L / H≤1, it is impossible to meet the requirement that the first end 31 is connected to the first wall 11 and the second end 32 is connected to the second wall 12, thereby failing to improve the battery pack mode.

[0118] The technical solutions provided by the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technicians in this field, according to the idea of ​​the present utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: A box body (10), the box body (10) having a first direction (X) and a third direction (Z) intersecting each other, the box body (10) comprising a first wall (11) and a second wall (12) arranged opposite to each other along the third direction (Z), and a containing cavity (101) being arranged in the box body (10); A plurality of battery cells (20) are disposed in the accommodating cavity (101), and the plurality of battery cells (20) are arranged at least along the first direction (X); a support member (30) disposed in the accommodating cavity (101), the support member (30) being disposed between two adjacent battery cells (20) in the first direction (X), the support member (30) comprising a first end (31) and a second end (32) disposed opposite to each other in the third direction (Z); Wherein, the first end (31) is connected to the first wall (11), and the second end (32) is connected to the second wall (12).

2. The battery pack according to claim 1, characterized in that: The battery cell (20) comprises a first surface (21) and a second surface (22) arranged opposite to each other along the third direction (Z); In the third direction (Z), the first surface (21) is adjacent to the first wall (11), the second surface (22) is adjacent to the second wall (12), and a gap (110) exists between the first wall (11) and the first surface (21).

3. The battery pack according to claim 2, characterized in that: In the third direction (Z), the second surface (22) abuts against the second wall (12).

4. The battery pack according to claim 2, characterized in that: The box (10) also has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The battery pack further comprises a pressure strip (13), the pressure strip (13) extending along the first direction (X), the pressure strip (13) being arranged in the gap (110), and the pressure strip (13) comprising a first contact surface (131) and a second contact surface (132) arranged opposite to each other along the third direction (Z); The first contact surface (131) abuts against the first surfaces (21) of two adjacent battery cells (20) in the second direction (Y), and along the third direction (Z), the second contact surface (132) abuts against or has a gap with the first wall (11).

5. The battery pack according to claim 2, characterized in that: The box (10) also has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The battery pack further comprises a pressure strip (13), the pressure strip (13) extending along the first direction (X), the pressure strip (13) being arranged in the gap (110), the pressure strip (13) comprising a first contact surface (131) and a second contact surface (132) arranged opposite to each other along the third direction (Z); a recessed portion (310) is arranged at one end of the first end (31) adjacent to the battery cell (20) in the first direction (X), the recessed portion (310) having a wall surface (3101), the wall surface (3101) being arranged opposite to the first wall (11) in the third direction (Z), and the first contact surface (131) abutting against the first surface (21) and the wall surface (3101) adjacent to each other in the second direction (Y); Along the third direction (Z), the second contact surface (132) abuts against the first wall (11), or there is a gap between the second contact surface (132) and the first wall (11).

6. The battery pack according to claim 1, wherein: The battery pack further comprises a connecting layer (33); The battery cell (20) comprises a third side wall (25) and a fourth side wall (26) arranged opposite to each other along a second direction (Y); The support member (30) comprises a first side surface (303) and a second side surface (304) which are arranged opposite to each other along the second direction (Y); The connecting layer (33) is provided between the first side surface (303) and the fourth side wall (26) adjacent to each other in the second direction (Y), and the connecting layer (33) connects the first side surface (303) and the fourth side wall (26); And / or, the connecting layer (33) is provided between the second side surface (304) and the third side wall (25) adjacent to each other in the second direction (Y), and the connecting layer (33) connects the second side surface (304) and the third side wall (25).

7. The battery pack according to claim 1, characterized in that: Along the third direction (Z), the size of the support member (30) is L mm, and the size of the battery cell (20) is H mm, satisfying: 1<L / H≤1.

3.

8. The battery pack according to claim 1, wherein: The battery pack further comprises a mounting assembly (40), wherein the mounting assembly (40) comprises a fastener (41), and the fastener (41) is arranged on a side of the second wall (12) facing away from the first wall (11) in the third direction (Z); Along the third direction (Z) on a plane perpendicular to the third direction (Z), the orthographic projection of the fastener (41) falls within the orthographic projection of the second end (32).

9. The battery pack according to claim 8, characterized in that: The mounting assembly (40) further comprises a carrier plate (42), the carrier plate (42) extending along the second direction (Y), and the carrier plate (42) being arranged on a side of the second wall (12) facing away from the first wall (11) in the third direction (Z); The fasteners (41) are inserted into the carrier plates (42), and each carrier plate (42) is provided with at least one fastener (41).

10. The battery pack according to claim 1, wherein: The battery pack further comprises a fixing member (34); a first end (31) of the supporting member (30) is provided with a plug hole (311), the plug hole (311) extends along the third direction (Z); and a first plug hole (111) is provided on the first wall (11) and is arranged opposite to the plug hole (311) along the third direction (Z); The fixing member (34) is inserted into the first plug hole (111) and the plug hole (311) and connects the supporting member (30) and the first wall (11).

11. The battery pack according to claim 10, characterized in that: The insertion hole (311) passes through the support member (30) along the third direction (Z), and the second wall (12) is provided with a second insertion hole arranged opposite to the insertion hole (311) along the third direction (Z); The fixing member (34) is inserted into the first plug hole (111) and the plug hole (311) and connects the support member (30) and the first wall (11); the fixing member (34) is inserted into the plug hole (311) and the second plug hole and connects the support member (30) and the second wall (12); Alternatively, the fixing member (34) comprises a first fixing member and a second fixing member, wherein the first fixing member is inserted into the first plugging hole (111) and the plugging hole (311) and connects the support member (30) and the first wall (11), and the second fixing member is inserted into the second plugging hole and the plugging hole (311) and connects the support member (30) and the second wall (12).

12. The battery pack according to claim 1, wherein: The support member (30) is provided with a cavity inside.

13. An electric vehicle, characterized in that: The invention comprises a battery pack as claimed in any one of claims 1 to 12.

Images