Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device.According to the battery pack, a bearing piece is arranged in a containing cavity of a box body, the bearing piece is arranged close to a bottom plate in the third direction of the battery pack, and the face, facing the bottom plate in the third direction, of the bearing piece is connected with the bottom plate, so that the bearing piece, the bottom plate and the box body form a whole; the surface, deviating from the bottom plate, of the bearing piece in the third direction abuts against the first wall of the battery single body to bear the battery single body, so that the stability of the battery single body in the box body is ensured, the space utilization rate in the box body is improved, the energy density of the battery pack is improved, and the service life of the battery pack is prolonged. And the bottom plate is detachably connected with the box body and is also detachably connected with the bearing piece through the first connecting part, so that subsequent maintenance and repair are facilitated, and the repair efficiency of the battery pack is improved.

Description

Technical Field

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

[0002] The various road conditions encountered by electric vehicles during driving are testing the mechanical stability of the battery pack. In existing battery packs, in order to ensure the stability of the battery cells or battery groups in the battery pack, it is usually necessary to add crossbeams in the box, or even fix the crossbeams to the bottom plate to ensure the stability of the battery cells. This will reduce the space utilization in the box, affect the energy density of the battery pack, and make the bottom plate difficult to remove, affecting the maintenance efficiency of the battery pack. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electrical device to solve the current problem of reduced energy density of the battery pack and low maintenance efficiency due to ensuring the stability of the battery cells.

[0004] A first aspect of an embodiment of the present application provides a battery pack, the battery pack having a third direction, the battery pack comprising: a box body, with a accommodating cavity provided therein, the box body comprising a first surface and a second surface arranged opposite to each other along the third direction, the first surface being provided with a first opening; a battery cell arranged in the accommodating cavity, the battery cell comprising a first wall and a second wall arranged opposite to each other along the third direction; a bottom plate covering the first opening, the bottom plate being detachably connected to the box body; a receiving member arranged in the accommodating cavity, the receiving member being connected to the bottom plate at a side facing the bottom plate in the third direction, and the receiving member being abutted against the first wall of the battery cell at a side facing away from the bottom plate in the third direction to receive the battery cell; a first connecting portion being provided on a side of the bottom plate facing the receiving member in the third direction, the bottom plate being detachably connected to the receiving member via the first connecting portion.

[0005] Optionally, the battery pack also has a first direction, which intersects with the third direction; the box body includes two side walls arranged opposite to each other along the first direction; the receiving member includes two ends arranged opposite to each other along the first direction, and the two ends are respectively connected to the adjacent side walls.

[0006] Optionally, the battery pack also includes a fastener; second connecting parts are respectively arranged on two surfaces opposite to each other along the first direction of the two side walls; the receiving member includes a receiving plate, which extends along the first direction; the receiving plate and the adjacent second connecting part are overlapped along the third direction, and the fastener penetrates the second connecting part and the receiving plate along the third direction to fix the receiving member to the box body.

[0007] Optionally, the receiving member also includes a pressure block, which is arranged on a side of the receiving plate facing away from the second connecting portion in the third direction, and a pressure block is respectively arranged at two opposite ends of the receiving plate in the first direction; the pressure block is provided with a connecting column protruding from a side of the receiving plate in the third direction toward the receiving plate, the connecting column penetrates the receiving plate along the third direction, and a socket is provided on a side of the connecting column facing away from the pressure block in the third direction; the fastener penetrates the second connecting portion along the third direction and is inserted into the socket.

[0008] Optionally, the battery pack also has a second direction, and the first direction, the second direction and the third direction intersect each other; the receiving plate is provided with two protrusions on a side of the third direction facing the bottom plate, the protrusions extend along the first direction, and the two protrusions are spaced apart along the second direction; the pressure block extends along the second direction, and the pressure block is arranged between the two protrusions.

[0009] Optionally, the receiving member further includes a buffer plate and a connecting plate, the buffer plate and the receiving plate are spaced apart along the third direction, the buffer plate is connected to the receiving plate via the connecting plate, and the receiving member is connected to the bottom plate via the buffer plate.

[0010] Optionally, a cavity is provided in the receiving plate, and reinforcing ribs are connected in the cavity.

[0011] Optionally, the battery pack also has a first direction and a second direction, and the first direction, the second direction and the third direction intersect with each other; the battery pack includes at least two partitions, the partitions extend along the first direction, and at least two of the partitions are spaced apart along the second direction, and a accommodating cavity is defined between the at least two partitions, and at least one of the battery cells is arranged in the accommodating cavity; the battery cell includes a third wall and a fourth wall arranged opposite to each other along the first direction, and a fifth wall and a sixth wall arranged opposite to each other along the second direction, and the third wall, the fifth wall, the fourth wall and the sixth wall enclose a shell having openings at both ends along the third direction, and the first wall and the second wall respectively cover the openings at both ends of the shell in the third direction; the fifth wall and the sixth wall are the surfaces with the largest surface areas, and the fifth wall and the sixth wall respectively abut against the adjacent partitions.

[0012] Optionally, the battery pack further includes at least two baffles, at least two of which are spaced apart in the accommodating cavity along the first direction; the baffles are respectively abutted against adjacent partitions on opposite sides along the second direction; and of the two adjacent baffles along the first direction, one baffle abuts against the third wall of the battery cell, and the other baffle abuts against the fourth wall of the battery cell.

[0013] Optionally, the battery pack also includes a cover plate, the second side is provided with a second opening, the cover plate covers the second opening, and the cover plate is detachably connected to the box body; the cover plate is provided with a protrusion on a side facing the bottom plate in the third direction, and the protrusion is connected to the second wall of the battery cell on a side facing away from the cover plate in the third direction.

[0014] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery pack as described above.

[0015] In summary, the embodiments of the present application provide a battery pack and an electrical device having the battery pack, wherein the battery pack is provided with a receiving member in the accommodating cavity of a box body, and the receiving member is provided close to the bottom plate in the third direction of the battery pack, and the receiving member is connected to the bottom plate on a side facing the bottom plate in the third direction, so that the receiving member, the bottom plate and the box body form a whole, thereby improving the overall strength of the battery pack, and the receiving member is abutted against the first wall of the battery cell on a side facing away from the bottom plate in the third direction to receive the battery cell, thereby ensuring the stability of the battery cell in the box body while improving the space utilization in the box body and improving the energy density of the battery pack, and the bottom plate is detachably connected to the box body while being detachably connected to the receiving member through the first connecting portion, thereby facilitating subsequent care and maintenance and improving the repair efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0018] Figure 2 yes Figure 1 Exploded diagram of

[0019] Figure 3 yes Figure 1 AA section view;

[0020] Figure 4 is a schematic diagram of the structure of the battery pack provided in an embodiment of the present application after the box body and the cover plate are removed;

[0021] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at B;

[0022] Figure 6 yes Figure 4 A front view of

[0023] Figure 7 is a schematic diagram of the structure of a box in a battery pack provided in an embodiment of the present application;

[0024] Figure 8 This is a schematic diagram of the first structure of the battery pack receiving member provided in the embodiment of the present application;

[0025] Fig. 9 It is a structural schematic diagram of a receiving plate in a receiving member of a battery pack provided in an embodiment of the present application;

[0026] Fig.10 yes Fig. 9 A front view of

[0027] Fig.11 It is a schematic diagram of the structure of a pressure block in a receiving member of a battery pack provided in an embodiment of the present application;

[0028] Fig.12 is a schematic diagram of the structure of the bottom plate in the battery pack provided in an embodiment of the present application;

[0029] Fig.13 This is a schematic diagram of the second structure of the battery pack receiving member provided in the embodiment of the present application;

[0030] Fig.14 yes Fig.13 A front view of

[0031] Fig.15 It is a schematic diagram of the combined structure of the partition, baffle, liquid inlet pipe and liquid outlet pipe in the battery pack provided in the embodiment of the present application;

[0032] Fig.16 It is a schematic diagram of the combined structure of the partition and the baffle in the battery pack provided in the embodiment of the present application;

[0033] Fig.17 yes Fig.16 A front view of

[0034] Fig.18 is a schematic diagram of the structure of a cover plate in a battery pack provided in an embodiment of the present application;

[0035] Fig.19It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0036] Description of main reference numerals:

[0037] 1. Battery pack;

[0038] 10. box body, 101. accommodating cavity, 11. first surface, 111. first opening, 12. second surface, 121. second opening, 13. side wall, 131. second connecting portion, 132. first side wall, 133. second side wall, 14. end wall, 141. first end wall, 142. second end wall;

[0039] 20. Battery cell, 21. First wall, 22. Second wall, 23. Third wall, 24. Fourth wall, 25. Fifth wall, 26. Sixth wall;

[0040] 30. bottom plate, 31. first connecting portion;

[0041] 40. receiving member, 401. first end, 402. second end, 41. receiving plate, 41a. through hole, 410. cavity, 411. protrusion, 412. reinforcing rib, 413. side, 42. pressing block, 421. connecting column, 422. jack, 43. buffer plate, 44. connecting plate;

[0042] 50. Fasteners;

[0043] 60, partition, 601, accommodating cavity, 61, cavity, 62, rib plate, 63, liquid inlet pipe, 64, liquid outlet pipe;

[0044] 70. Baffle;

[0045] 80. Cover plate, 81. Raised portion, 82. Connecting piece.

[0046] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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%.

[0052] The present embodiment provides an electrical device, including a battery pack. The battery pack is used to provide electrical energy. The electrical device may be a ship, a vehicle, etc. The vehicle is a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The main body of the vehicle is provided with a drive motor, which is electrically connected to the battery pack, and the battery pack provides electrical energy. The drive motor is connected to the wheels on the main body of the vehicle through a transmission mechanism, thereby driving the vehicle to move forward. In addition, the battery pack can also be used in electrical devices such as energy storage cabinets to provide electrical energy.

[0053] In some embodiments, a battery pack 1 is provided, referring to Figure 1 to Figure 14 as well as Fig.19 The battery pack 1 includes: a box body 10, a battery cell 20, a bottom plate 30 and a receiving member 40. The battery pack 1 has a first direction X, a second direction Y and a third direction Z intersecting each other. Figure 1 to Figure 3 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0054] In some embodiments, reference Figure 7 The box body 10 has a receiving cavity 101 therein, including a first surface 11 and a second surface 12 arranged opposite to each other along a third direction Z. The first surface 11 has a first opening 111 formed therein. The first opening 111 passes through the first surface 11 along the third direction Z and communicates with the receiving cavity 101.

[0055] Reference Figure 2 to Figure 9 as well as Fig.19 The battery cell 20 is disposed in the accommodating cavity 101 of the box body 10 . The battery cell 20 includes a first wall 21 and a second wall 22 that are oppositely disposed along a third direction Z. The first wall 21 is close to the first opening 111 in the third direction Z.

[0056] Reference Figure 1 to Figure 6 as well as Fig.12 The bottom plate 30 covers the first opening 111 of the box body 10. Specifically, the bottom plate 30 covers the first surface 11 of the box body 10, and the bottom plate 30 forms a seal for the first opening 111. The bottom plate 30 and the first surface 11 of the box body 10 are detachably connected, and the bottom plate 30 and the battery cell 20 are spaced apart along the third direction Z. In some implementations, the bottom plate 30 and the first surface 11 of the box body 10 can be detachably connected by bolts. In some implementations, the bottom plate 30 and the first surface 11 can be detachably connected by gluing. Figure 2 and Fig.12The first connecting portion 31 is provided on one side of the bottom plate 30 facing the receiving member 40 in the third direction Z, and the bottom plate 30 is detachably connected to the receiving member 40 through the first connecting portion 31. The first connecting portion 31 is protrudingly provided on one side of the bottom plate 30 facing the receiving member 40 in the third direction Z, and the first connecting portion 31 partially connects the bottom plate 30 with the receiving member 40.

[0057] Reference Figure 2 to Figure 6 as well as Figure 8 to Figure 11 The receiving member 40 is arranged in the accommodating cavity 101 of the box body 10. Specifically, the receiving member 40 is arranged between the first wall 21 of the battery cell 20 and the bottom plate 30. The receiving member 40 is connected to the bottom plate 30 on a side facing the bottom plate 30 in the third direction Z, and the receiving member 40 is abutted against the first wall 21 of the battery cell 20 on a side facing away from the bottom plate 30 in the third direction Z to receive the battery cell 20.

[0058] In existing battery packs, in order to ensure the stability of internal battery cells or battery groups, cross beams are usually added inside the battery pack box, and even the cross beams are fixedly connected to the bottom plate to ensure the stability of the internal battery cells or battery groups. This will reduce the space utilization rate in the box and affect the energy density of the battery pack.

[0059] The battery pack 1 provided in the embodiment of the present application has a receiving member 40 disposed inside the accommodating cavity 101. The receiving member 40 is disposed between the bottom plate 30 and the battery cell 20. The receiving member 40 is connected to the bottom plate 30 on one side facing the bottom plate 30 in the third direction Z, so that the receiving member 40, the bottom plate 30 and the box body 10 form a whole, thereby improving the overall strength of the battery pack 1. The receiving member 40 is abutted against the first wall 21 of the battery cell 20 on one side facing away from the bottom plate 30 in the third direction Z, so that the receiving member 40 receives the battery cell 20, thereby improving the overall strength of the battery pack 1 and ensuring the stability of the battery cell 20 in the box body 10. Moreover, the receiving member 40 is disposed close to the bottom plate 30 in the third direction Z, so that only a small space inside the box body 10 is occupied in the third direction Z to ensure the stability of the battery cell 20. Compared with the structure in which a crossbeam is disposed inside the box body 10, the space utilization inside the box body 10 is significantly improved, and the energy density of the battery pack 1 is improved. In addition, the detachable connection between the bottom plate 30 and the first surface 11 of the box body 10 allows the bottom plate 30 to be removed from the box body 10, which is convenient for subsequent maintenance and repair, and improves maintenance efficiency. In addition, the bottom plate 30 is partially connected to the receiving member 40 through the first connecting portion 31, so that the box body 10, the bottom plate 30 and the receiving member 40 form a whole to improve the overall strength of the battery pack 1, and ensure that the bottom plate 30 can be removed from the box body 10 and the receiving member 40, and the provision of the first connecting portion 31 on the bottom plate 30 will reduce the overall weight of the battery pack 1.

[0060] In some embodiments, reference Figure 2 to Figure 6 The battery pack 1 includes a plurality of receiving members 40, the receiving members 40 extend along a first direction X, the plurality of receiving members 40 are arranged at intervals along a second direction Y, the number of battery cells 20 is multiple, the plurality of battery cells 20 are arranged at intervals along the first direction X to form a row of battery cells, and the plurality of rows of battery cells are arranged at intervals along the second direction Y to form a battery pack, each battery cell 20 is straddled on two adjacent receiving members 40 along the second direction Y, and the two receiving members 40 are respectively overlapped with the first wall 21 of the battery cell 20 along the third direction Z to form a receiving portion for the battery cell 20.

[0061] In some embodiments, reference Figure 2 to Figure 6 , refer to Figure 2 and Fig.12 The number of the first connection parts 31 is multiple, and the multiple first connection parts 31 are arranged at intervals on a side of the bottom plate 30 facing the receiving member 40 in the third direction Z. Figure 2 and Fig.12 In the illustrated embodiment, a plurality of first connection portions 31 spaced apart along a first direction X form a column, and a plurality of first connection portions 31 spaced apart along a second direction Y form a row. The rows and columns are crossed so that the plurality of first connection portions 31 are arranged in an array on the base plate 30. The number of first connection portions 31 in each column is 1 to 11, and the number of first connection portions 31 in each row is 1 to 11, thereby ensuring that each receiving member 40 can be connected to the plurality of first connection portions 31, thereby improving the connection stability between the base plate 30 and the receiving member 40.

[0062] In some embodiments, reference Fig.12 , the size of the first connection part 31 in the first direction X is L, 10mm≤L≤400mm, and the size of the first connection part 31 in the second direction Y is W2, 10mm≤W2≤400mm. When the size of the first connection part 31 is within the above range, the connection stability between the bottom plate 30 and the receiving member 40 can be ensured, and then the receiving stability of the receiving member 40 to the battery cell 20 can be ensured. Among them, the size of L can be 10mm, 20mm, 50mm, 100mm, 200mm, 300mm, 400mm and other sizes, and the size of W2 can be 10mm, 20mm, 50mm, 100mm, 200mm, 300mm, 400mm and other sizes.

[0063] In some embodiments, the first connection portion 31 is connected to the base plate 30 and the receiving member 40 by gluing. Specifically, one end of the first connection portion 31 in the third direction Z is glued to the base plate 30, and the other end of the first connection portion 31 in the third direction Z is glued to the receiving member 40.

[0064] In some embodiments, the first connecting portion 31 connects the base plate 30 and the receiving member 40 via a fastener (not shown in the figure), and a sealing member (not shown in the figure) is sleeved on the first connecting portion 31 to ensure the sealing of the connection between the base plate 30 and the receiving member 40.

[0065] In some embodiments, the first connection portion 31 may also be integrally formed with the bottom plate 30 . The first connection portion 31 is a groove recessed in the bottom plate 30 , and the bottom plate 30 and the receiving member 40 are connected by gluing.

[0066] In some embodiments, reference Figure 7 The box body 10 includes two side walls 13 arranged opposite to each other along the first direction X and two end walls 14 arranged opposite to each other along the second direction Y. The two side walls 13 include a first side wall 132 and a second side wall 133. The two end walls 14 include a first end wall 141 and a second end wall 142. The first side wall 132, the first end wall 141, the second side wall 133 and the second end wall 142 enclose a box body with two open ends along the third direction Z. The first surface 11 and the second surface 12 respectively cover the two open ends of the box body in the third direction Z. Figure 7 and Figure 8 The receiving member 40 includes two ends relatively arranged along the first direction X, the two ends include a first end 401 and a second end 402, the first end 401 is detachably connected to the first side wall 132 or non-detachably connected, and the second end 402 is detachably connected to the second side wall 133 or non-detachably connected, so that the receiving member 40 and the box body 10 form an integral structure, while enhancing the overall strength of the battery pack 1, ensuring the receiving member 40 to firmly receive the battery cell 20.

[0067] In some embodiments, reference Figure 3 to Figure 6 as well as Figure 8 The battery pack 1 further includes a fastener 50, and second connecting portions 131 are respectively disposed on two surfaces of the first side wall 132 and the second side wall 133 that are opposite to each other along the first direction X, and the second connecting portions 131 extend along the second direction Y. Figure 3 to Figure 6 as well as Figure 8 to Figure 10 The receiving member 40 includes a receiving plate 41, and the receiving plate 41 is overlapped along the third direction Z between the second connecting portion 131 adjacent to the receiving plate 41 in the first direction X, referring to Figure 3 to Figure 6 as well as Figure 8, the fastener 50 passes through the second connecting portion 131 and the receiving plate 41 along the third direction Z to fix the receiving plate 41 and the second connecting portion 131. The receiving member 40 receives the battery cell 20 through the receiving plate 41. The provision of the fastener 50 can ensure the stability and firmness of the connection between the receiving plate 41 and the box body 10, thereby ensuring the stability of the receiving plate 41 receiving the battery cell 20. In addition, the receiving plate 41 and the second connecting portion 131 are fixedly connected by the fastener 50, which can improve the anti-extrusion ability of the box body 10 in the first direction X. The fixed connection here includes a detachable connection and a non-detachable connection. Among them, the definition of a non-detachable connection is that the structure must be destroyed before it can be disassembled, such as riveting. The definition of a detachable connection is that it can be disassembled without destroying the structure, such as a threaded connection or gluing.

[0068] In some embodiments, reference Figure 8 , Fig.11 and Fig.14 The receiving member 40 further includes a pressing block 42, which is disposed on a side of the receiving plate 41 away from the second connecting portion 131 in the third direction Z. A pressing block 42 is disposed at each of the two opposite ends of the receiving plate 41 in the first direction X. Figure 3 The pressing block 42, the receiving plate 41 and the adjacent second connecting portion 131 are stacked along the third direction Z, referring to Fig.11 The pressing block 42 is provided with a connecting column 421 on one side thereof protruding toward the receiving plate 41 in the third direction Z, and a plug hole 422 is provided on one side of the connecting column 421 away from the pressing block 42 in the third direction Z. Figure 3 The fastener 50 passes through the second connection part 131 along the third direction Z and is inserted into the insertion hole 422. The arrangement of the pressure block 42 and the connection column 421, as well as the arrangement of the insertion hole 422 in the connection column 421, can limit and fix the fastener 50, so that the fastener 50 extends along the third direction Z, thereby ensuring that the fastener 50 is fixedly connected to the receiving member 40 and the second connection part 131, while preventing the fastener 50 from damaging the receiving member 40 and the second connection part 131 due to shaking. The fastener 50 is inserted into the insertion hole 422 to improve the connection strength of the fastener 50, and further ensure the connection stability and firmness between the receiving member 40 and the box body 10. In some implementations, the insertion hole 422 is provided with an internal thread, the fastener 50 is a bolt, and the fastener 50 is threadedly connected to the connection column 421.

[0069] In some embodiments, the pressing block 42 is connected to the receiving plate 41 by adhesive bonding, welding or bolts.

[0070] In some embodiments, reference Figure 8 to Figure 10 The receiving plate 41 is provided with two protrusions 411 on one side facing the bottom plate 30 in the third direction Z. The protrusions 411 extend along the first direction X. The two protrusions 411 are spaced apart along the second direction Y. Figure 8 and Fig.14 , the pressing block 42 extends along the second direction Y, and the pressing block 42 is arranged between the two protrusions 411. The arrangement of the protrusions 411 can limit the pressing block 42, preventing the pressing block 42 from moving along the second direction Y. Moreover, when the first connecting portion 31 on the bottom plate 30 is adhesively connected with the receiving plate 41 of the receiving member 40, the two protrusions 411 can play a role in limiting the glue, thereby controlling the thickness of the glue layer and the gluing area. At the same time, the two protrusions 411 can also improve the overall strength of the receiving member 40, further ensuring the stability of the connection between the receiving member 40 and the box body 10 and the stability of the receiving member 40 receiving the battery cell 20.

[0071] In some embodiments, reference Fig.14 The receiving member 40 further includes a buffer plate 43 and a connecting plate 44. The buffer plate 43 and the receiving plate 41 are spaced apart along the third direction Z. The buffer plate 43 extends along the first direction X. The buffer plate 43 is connected to the receiving plate 41 through the connecting plate 44. The receiving member 40 is connected to the bottom plate 30 through the buffer plate 43. There are two connecting plates 44, which are spaced apart along the second direction Y. The connecting plate 44 is inclined. The cooperation between the buffer plate 43 and the connecting plate 44 forms a buffer for the receiving plate 41 in the third direction Z. Moreover, the buffer plate 43 can absorb the energy of the ball hit or impact received by the first surface 11 of the box body 10 while ensuring that it is fixed to the bottom plate 30, thereby increasing the buffer deformation space and the energy absorption space, thereby increasing the service life of the battery pack 1.

[0072] In some embodiments, reference Figure 8 to Figure 10 as well as Fig.14 A cavity 410 is provided in the receiving plate 41, and a reinforcing rib 412 is connected in the cavity 410. The setting of the cavity 410 can reduce the weight of the receiving plate 41, thereby reducing the overall weight of the battery pack 1 and improving the energy density of the battery pack 1. The setting of the reinforcing rib 412 can increase the strength of the receiving plate 41 and ensure the stability of the receiving plate 41 in receiving the battery cell 20.

[0073] In some embodiments, reference Fig. 9 The receiving plate 41 is provided with through holes 41a at both ends in the first direction X, respectively. The through holes 41a are connected to the cavity 410. The through holes 41a correspond to the connecting columns 421 in number. The fasteners 50 are inserted into the through holes 41a and inserted into the sockets 422 on the connecting columns 421, thereby ensuring the assembly convenience and stability between the fasteners 50 and the receiving plate 41.

[0074] In some embodiments, the receiving plate 41 is made of a polyurethane composite material and is formed by a pultrusion process.

[0075] In some embodiments, the receiving plate 41 is made of metal material, plastic material or other composite materials.

[0076] In some embodiments, reference Fig.10 The receiving plate 41 includes two side edges 413 arranged opposite to each other along the second direction Y, and the wall thickness of each side edge 413 in the second direction Y is t1, satisfying: t1 ≥ 2 mm. When the wall thickness t1 of the side edge 413 is within the above range, the rigidity of the receiving plate 41 can be ensured, thereby ensuring the receiving stability of the receiving plate 41 on the battery cell 20.

[0077] In some embodiments, the wall thickness of the reinforcing rib 412 in the second direction Y is t2, satisfying: t2 ≥ 2 mm. When the wall thickness t2 of the reinforcing rib 412 is within the above range, the supporting strength of the reinforcing rib 412 in the cavity 410 can be ensured, thereby ensuring the rigidity of the receiving plate 41.

[0078] In some embodiments, the spacing between the two side edges 413 in the second direction Y is W1, which satisfies: 2mm≤W1≤200mm. When the spacing W1 between the two side edges 413 is within the above range, the contact area between the receiving plate 41 and the first wall 21 of the battery cell 20 can be ensured, thereby ensuring the receiving stability of the receiving member 40 on the battery cell 20. The size of W1 can be 2mm, 5mm, 10mm, 20mm, 50mm, 100mm, 200mm.

[0079] In some embodiments, the height of the receiving plate 41 in the third direction Z is H1, which satisfies: 2mm≤H1≤200mm. When the height H1 of the receiving plate 41 is within the above range, the receiving stability of the receiving plate 41 on the battery cell 20 can be ensured, and the receiving member 40 will not occupy too much space in the third direction Z, thereby ensuring the space utilization of the box 10 in the third direction Z and the energy density of the battery pack 1. The size of H1 can be 2mm, 5mm, 10mm, 20mm, 50mm, 100mm, 200mm.

[0080] In some embodiments, reference Figure 2 to Figure 6 as well as Figure 16-17 The battery pack 1 includes at least two partitions 60, which are arranged at intervals along the second direction Y. An accommodating cavity 601 is defined between two adjacent partitions 60 in the second direction Y. At least one battery cell 20 is arranged in the accommodating cavity 601. Fig.19The battery cell 20 includes a third wall 23 and a fourth wall 24 that are arranged opposite to each other along the first direction X, and a fifth wall 25 and a sixth wall 26 that are arranged opposite to each other along the second direction Y. The third wall 23, the fifth wall 25, the fourth wall 24 and the sixth wall 26 enclose a shell having two openings along the third direction Z. The first wall 21 and the second wall 22 respectively cover the two openings of the shell in the third direction Z. The fifth wall 25 and the sixth wall 26 are the two faces with the largest surface area of ​​the battery cell 20. Along the second direction Y, the fifth wall 25 and the sixth wall 26 respectively abut against the adjacent partition 60. The partition 60 can fix and limit the battery cell 20 in the second direction Y to prevent the battery cell 20 from shaking in the second direction Y.

[0081] In some embodiments, reference Figures 4 to 6 The partitions 60 and the receiving members 40 correspond one to one in number. Specifically, the partitions 60 extend along the first direction X, and are arranged along the third direction Z on the side of the receiving plate 41 away from the bottom plate 30. Along the second direction Y, the first walls 21 of the battery cells 20 located between the two adjacent partitions 60 are respectively abutted against the receiving plates 41 in the two adjacent receiving members 40. The coordinated use of the partitions 60 and the receiving members 40 can further ensure the stability of the battery cells 20 in the box body 10.

[0082] In some embodiments, reference Fig.17 The partition 60 is provided with a cavity 61 for the heat transfer medium to flow, and the cavity 61 is connected with a rib plate 62, which extends along the first direction X. A plurality of rib plates 62 are arranged at intervals along the third direction Z, and a flow channel for the heat transfer medium to flow is defined in the cavity 61 between two adjacent rib plates 62 in the third direction Z. The opening of the cavity 61 can form a buffer for the expansion of the battery cell 20 abutting against the partition 60, and the partition 60 abuts against the fifth wall 25 or the sixth wall 26 of the battery cell 20 with the largest surface area. The extrusion force generated by the expansion of the fifth wall 25 or the sixth wall 26 is the largest, and the cavity 61 can form a buffer and absorption of the extrusion force, thereby extending the service life of the battery cell 20. The provision of the ribs 62 can improve the strength of the partition 60, thereby improving the service life of the partition 60, and the flow channel defined between two adjacent ribs 62 can not only ensure the flow rate of the heat-conducting medium, but also ensure the uniformity of the distribution of the heat-conducting medium in the cavity 61, thereby ensuring the regulation of the surface temperature of the battery cell 20 and improving the thermal management capability of the battery pack 1.

[0083] In some embodiments, reference Figure 4 as well as Figure 15 to Figure 17 The battery pack 1 further includes at least two baffles 70, which are spaced apart in the accommodating cavity 601 along the first direction X, and the baffles 70 are respectively in contact with the adjacent partitions 60 on opposite sides along the second direction Y. Fig.15In the embodiment shown, the number of the partitions 60 in the battery pack 1 is eight, which are arranged at intervals along the second direction Y and along the first direction X. Figure 4 as well as Fig.15 and Fig.16 In the illustrated embodiment, the number of baffles 70 between two adjacent partitions 60 in the second direction Y is seven, which are arranged at intervals along the first direction X. A battery cell 20 is arranged between two adjacent baffles 70 along the first direction X. Among the two adjacent baffles 70, one baffle 70 abuts against the third wall 23 of the battery cell 20, and the other baffle 70 abuts against the fourth wall 24 of the battery cell 20, thereby limiting and fixing the battery cell 20 in the first direction X.

[0084] Specifically, the receiving member 40 is connected to the bottom plate 30, and the bottom plate 30 is connected to the box body 10, so that the receiving member 40, the bottom plate 30 and the box body 10 form a whole, while improving the overall strength of the battery pack 1, ensuring the stability of the battery cell 20 in the third direction Z, the setting of the partition 60 forms a restriction and fixation of the battery cell 20 in the second direction Y, and the setting of the baffle 70 forms a restriction and fixation of the battery cell 20 in the first direction X, thereby realizing the restriction and fixation of the battery cell 20 in three directions, thereby ensuring the assembly stability of the battery cell 20 in the box body 10, and ensuring the energy density of the battery pack 1.

[0085] In some embodiments, reference Figure 2 to Figure 6 as well as Figure 15 to Figure 17 The battery pack 1 also includes a liquid inlet pipe 63 and a liquid outlet pipe 64. One ends of the multiple partitions 60 located on the same side in the first direction X are respectively connected to the liquid inlet pipe 63, and the other ends of the multiple partitions 60 located on the same side in the first direction X are respectively connected to the liquid outlet pipe 64. The heat-conducting medium enters the cavity 61 of the partition 60 through the liquid inlet pipe 63 and is discharged through the liquid outlet pipe 64 to form a circulation of the heat-conducting medium. The liquid inlet pipe 63, the partition 60 and the liquid outlet pipe 64 form a thermal management component to form thermal management of the battery cell 20. The temperature of the battery cell 20 is adjusted by the heat-conducting medium in the partition 60 to improve the service life of the battery cell 20.

[0086] In some embodiments, reference Figure 1 to Figure 3 as well as Fig.18 The battery pack 1 also includes a cover plate 80, referring to Figure 7 The second surface 12 of the box body 10 is provided with a second opening 121, and the cover plate 80 covers the second opening 121. The cover plate 80 is detachably connected to the box body 10. Fig.18A protrusion 81 is provided on the side of the cover plate 80 facing the bottom plate 30 in the third direction Z, and the protrusion 81 is connected to the second wall 22 of the battery cell 20 on the side facing away from the cover plate 80 in the third direction Z. The provision of the protrusion 81 can ensure the connection stability between the cover plate 80 and the battery cell 20, so that the cover plate 80, the box body 10 and the battery cell 20 form a whole, further improving the strength and impact resistance of the entire battery pack 1.

[0087] In some embodiments, the protrusion 81 is connected to the cover plate 80 by welding, screwing or bonding.

[0088] In some embodiments, the protrusion 81 and the cover plate 80 are compositely formed.

[0089] In some embodiments, the protrusion 81 is adhesively connected to the second wall 22 of the battery cell 20 .

[0090] In some embodiments, a buffer portion (not shown in the figure) is provided on a side of the protrusion 81 facing the bottom plate 30 in the third direction Z, and the side of the buffer portion facing away from the cover plate 80 in the third direction Z abuts against the second wall 22 of the battery cell 20. The design of the buffer portion can form a buffer and force transmission between the cover plate 80 and the battery cell 20, thereby absorbing the impact force or impact force received by the cover plate 80 during the vibration of the battery pack 1, thereby protecting the battery cell 20 and improving the service life of the battery pack 1.

[0091] In some embodiments, reference Figure 1 and Figure 2 A connector 82 is provided on one side of the cover plate 80 that is away from the base plate 30 in the third direction Z. There are multiple connectors 82 that are spaced apart on one side of the cover plate 80 that is away from the base plate 30 in the third direction Z. The connectors 82 are used for assembling the battery pack 1 with the electrical device to improve assembly convenience.

[0092] In some embodiments, the connector 82 is connected to the cover plate 80 by welding, screwing or bonding.

[0093] In some embodiments, the connector 82 and the cover plate 80 are compositely molded.

[0094] The technical solutions provided by the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the present invention are explained in detail using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, 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 invention.

Claims

1. A battery pack having a third direction (Z), characterized in that: The battery pack comprises: A box body (10) is provided with a receiving cavity (101) therein, the box body (10) comprises a first surface (11) and a second surface (12) arranged opposite to each other along the third direction (Z), the first surface (11) being provided with a first opening (111); A battery cell (20) is arranged in the accommodating cavity (101), wherein the battery cell (20) comprises a first wall (21) and a second wall (22) which are arranged opposite to each other along the third direction (Z); A bottom plate (30) covers the first opening (111), and the bottom plate (30) is detachably connected to the box body (10); a receiving member (40) disposed in the accommodating cavity (101), wherein the receiving member (40) is connected to the bottom plate (30) on one side thereof facing the bottom plate (30) in the third direction (Z), and abuts against the first wall (21) of the battery cell (20) on one side thereof facing away from the bottom plate (30) in the third direction (Z) to receive the battery cell (20); A first connection portion (31) is provided on a surface of the bottom plate (30) facing the receiving member (40) in the third direction (Z), and the bottom plate (30) is detachably connected to the receiving member (40) via the first connection portion (31).

2. The battery pack according to claim 1, characterized in that: The battery pack also has a first direction (X), the first direction (X) intersecting the third direction (Z); The box body (10) comprises two side walls (13) arranged opposite to each other along the first direction (X); The receiving member (40) comprises two ends arranged opposite to each other along the first direction (X), and the two ends are respectively connected to the adjacent side walls (13).

3. The battery pack according to claim 2, characterized in that: The battery pack also includes a fastener (50); Second connecting portions (131) are respectively provided on two surfaces of the two side walls (13) that are opposite to each other along the first direction (X); The receiving member (40) comprises a receiving plate (41), and the receiving plate (41) extends along the first direction (X); The receiving plate (41) and the adjacent second connecting portion (131) are overlapped along the third direction (Z), and the fastener (50) passes through the second connecting portion (131) and the receiving plate (41) along the third direction (Z) to fixedly connect the receiving member (40) to the box body (10).

4. The battery pack according to claim 3, characterized in that: The receiving member (40) further comprises a pressing block (42), wherein the pressing block (42) is arranged on a side of the receiving plate (41) away from the second connecting portion (131) in the third direction (Z), and a pressing block (42) is respectively arranged at two opposite ends of the receiving plate (41) in the first direction (X); The pressing block (42) is provided with a connecting column (421) protruding on one side facing the receiving plate (41) in the third direction (Z), the connecting column (421) penetrates the receiving plate (41) along the third direction (Z), and a plug hole (422) is provided on one side of the connecting column (421) facing away from the pressing block (42) in the third direction (Z); The fastener (50) passes through the second connection portion (131) along the third direction (Z) and is inserted into the insertion hole (422).

5. The battery pack according to claim 4, characterized in that: The battery pack further has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The receiving plate (41) is provided with two protrusions (411) on one side facing the bottom plate (30) in the third direction (Z), the protrusions (411) extending along the first direction (X), and the two protrusions (411) are arranged at intervals along the second direction (Y); The pressing block (42) extends along the second direction (Y), and the pressing block (42) is arranged between the two protruding portions (411).

6. The battery pack according to claim 3, characterized in that: The receiving member (40) further comprises a buffer plate (43) and a connecting plate (44); the buffer plate (43) and the receiving plate (41) are arranged at intervals along the third direction (Z); the buffer plate (43) is connected to the receiving plate (41) via the connecting plate (44); and the receiving member (40) is connected to the bottom plate (30) via the buffer plate (43).

7. The battery pack according to claim 3, characterized in that: A cavity (410) is provided in the receiving plate (41), and a reinforcing rib (412) is connected in the cavity (410).

8. The battery pack according to claim 1, wherein: The battery pack further has a first direction (X) and a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The battery pack comprises at least two partitions (60), the partitions (60) extending along a first direction (X), at least two of the partitions (60) being arranged at intervals along the second direction (Y), a receiving cavity (601) being defined between the at least two partitions (60), and at least one of the battery cells (20) being arranged in the receiving cavity (601); The battery cell (20) comprises a third wall (23) and a fourth wall (24) arranged opposite to each other along the first direction (X), and a fifth wall (25) and a sixth wall (26) arranged opposite to each other along the second direction (Y); the third wall (23), the fifth wall (25), the fourth wall (24) and the sixth wall (26) enclose a shell having two open ends along the third direction (Z); the first wall (21) and the second wall (22) respectively cover the two open ends of the shell in the third direction (Z); The fifth wall (25) and the sixth wall (26) are surfaces with the largest surface areas, and the fifth wall (25) and the sixth wall (26) are respectively in contact with the adjacent partition (60).

9. The battery pack according to claim 8, characterized in that: The battery pack further comprises at least two baffles (70), wherein the at least two baffles (70) are arranged in the accommodating cavity (601) at intervals along the first direction (X); Two opposite sides of the baffle (70) along the second direction (Y) are respectively in contact with the adjacent partitions (60); Of the two baffles (70) adjacent to each other along the first direction (X), one baffle (70) abuts against the third wall (23) of the battery cell (20), and the other baffle (70) abuts against the fourth wall (24) of the battery cell (20).

10. The battery pack according to claim 1, wherein: The battery pack further comprises a cover plate (80), the second surface (12) is provided with a second opening (121), the cover plate (80) covers the second opening (121), and the cover plate (80) is detachably connected to the box body (10); The cover plate (80) is provided with a protrusion (81) on one side facing the bottom plate (30) in the third direction (Z), and the protrusion (81) is connected to the second wall (22) of the battery cell (20) on one side facing away from the cover plate (80) in the third direction (Z).

11. An electrical device, characterized in that: The invention comprises a battery pack as claimed in any one of claims 1 to 10.

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