Battery pack and vehicle

Abstract

The invention discloses a battery pack and a vehicle, the battery pack comprises at least one battery module, each battery module comprises a plurality of sub-battery modules, each sub-battery module comprises a plurality of layers of battery modules arranged in the vertical direction, and two adjacent layers of battery modules of each sub-battery module are electrically connected through a first connecting piece; and the battery modules positioned on the same layer in two adjacent sub-battery modules are electrically connected through a second connecting sheet. According to the battery pack provided by the embodiment of the invention, the battery pack comprises a plurality of sub-battery modules, two adjacent layers of battery modules of each sub-battery module are electrically connected through a first connecting piece, and the battery modules in the same layer in the two adjacent sub-battery modules are electrically connected through a second connecting piece; the electric connection structure between the battery modules is simplified, the connecting wire harness between the battery modules and the connector corresponding to the connecting wire harness are omitted, the cost of electric connection materials between the battery modules can be reduced, the space occupied by the electric connection structure between the battery modules is reduced, the overall structure of the battery pack is more compact, and the battery pack is more convenient to use. And the energy density of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the field of power batteries, and in particular to a battery pack and a vehicle. Background Art

[0002] In the related art, the power battery is usually installed on the beam of the vehicle. The power battery of the vehicle is usually arranged in groups of multiple standard boxes, and the multiple standard boxes are usually connected in series and parallel through connectors and wiring harnesses. The cost of connectors and wiring harnesses is high, which increases the cost of the whole vehicle; and the connectors and wiring harnesses are arranged outside the standard box of the battery, occupying more arrangement space, making the space utilization rate of the battery pack low. Therefore, there is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a battery pack, which is suitable for installation on the beam of a vehicle, by making the battery pack include multiple sub-battery modules, the two adjacent layers of battery modules of each sub-battery module are electrically connected by a first connecting piece, and the battery modules located on the same layer of two adjacent sub-battery modules are electrically connected by a second connecting piece, so as to simplify the electrical connection structure between the battery modules, eliminate the connection harness between the battery modules and the connector corresponding to the connection harness, reduce the cost of electrical connection materials between the battery modules, and reduce the space occupied by the electrical connection structure between the battery modules. The overall structure of the battery pack is more compact, which is conducive to improving the energy density of the battery pack.

[0004] The present invention also provides a vehicle having the battery pack.

[0005] A battery pack according to an embodiment of the first aspect of the present invention is suitable for being installed on a beam of a vehicle, wherein the battery pack comprises at least one battery module, each of the battery modules comprises a plurality of sub-battery modules arranged along a first direction, each of the sub-battery modules comprises a plurality of layers of battery modules arranged along an up-down direction, two adjacent layers of the battery modules of each sub-battery module are electrically connected via a first connecting sheet, and the battery modules located on the same layer of two adjacent sub-battery modules are electrically connected via a second connecting sheet, and the first direction is perpendicular to the up-down direction.

[0006] The battery pack according to the embodiment of the present invention is suitable for being installed on the beam of a vehicle. The battery pack includes a plurality of sub-battery modules, and the two adjacent layers of battery modules of each sub-battery module are electrically connected via a first connecting piece, and the battery modules located on the same layer in two adjacent sub-battery modules are electrically connected via a second connecting piece. This simplifies the electrical connection structure between the battery modules, eliminates the connection wiring harness between the battery modules and the connectors corresponding to the connection wiring harness, reduces the cost of electrical connection materials between the battery modules, and reduces the space occupied by the electrical connection structure between the battery modules. The overall structure of the battery pack is more compact, which is beneficial to improving the energy density of the battery pack.

[0007] According to some embodiments of the present invention, the first connecting piece is located on at least one side of the battery module along the first direction, and the second connecting piece is located between two of the sub-battery modules in the first direction.

[0008] According to some embodiments of the present invention, a limiting structure is provided on at least one side of the battery module along the first direction, and the limiting structure cooperates with the first connecting piece to limit the first connecting piece.

[0009] According to some embodiments of the present invention, a limiting through hole is formed on the limiting structure, and the first connecting piece is penetrated through the limiting through hole.

[0010] According to some embodiments of the present invention, the first connecting piece includes a first connecting segment, a second connecting segment and a third connecting segment connected in sequence, the first connecting segment and the third connecting segment both extend in the up-down direction, the second connecting segment extends in the second direction and is connected between the lower end of the first connecting segment and the upper end of the third connecting segment, the second direction is perpendicular to the up-down direction and to the first direction, and the first connecting segment and the third connecting segment are respectively connected to two adjacent layers of the battery modules in the sub-battery module.

[0011] According to some embodiments of the present invention, a highest position of the second connecting piece is lower than an upper surface of the battery module.

[0012] According to some embodiments of the present invention, the battery module includes multiple rows of battery packs arranged along a second direction, and two adjacent battery packs in the battery module are electrically connected via a third connecting plate, and the third connecting plate is located on at least one side of the battery module along the first direction, and the second direction is perpendicular to the up-down direction and perpendicular to the first direction.

[0013] According to some embodiments of the present invention, the third connecting piece is "U"-shaped.

[0014] According to some embodiments of the present invention, multiple battery modules of each battery module are connected in series, the battery pack includes a plurality of battery modules arranged along a second direction, and the plurality of battery modules are connected in parallel, and the second direction is perpendicular to the up-down direction and perpendicular to the first direction.

[0015] According to some embodiments of the present invention, each of the battery modules includes two sub-battery modules arranged along a first direction, and each of the sub-battery modules includes two layers of battery modules arranged along an up-and-down direction.

[0016] According to some embodiments of the present invention, the second connecting piece connected between the battery modules located in the upper layer includes a fourth connecting segment, a fifth connecting segment and a sixth connecting segment connected in sequence, the fourth connecting segment and the sixth connecting segment both extend in the up and down directions, the fifth connecting segment extends along the first direction and is connected between the lower end of the fourth connecting segment and the lower end of the sixth connecting segment, the fourth connecting segment and the sixth connecting segment are respectively connected to the two battery modules located in the upper layer in the battery module, and the second connecting piece connected between the battery modules located in the lower layer extends along the first direction.

[0017] According to some embodiments of the present invention, the battery pack includes a lower box body and an upper cover, the upper cover is arranged on the upper part of the lower box body and defines an installation cavity for accommodating the battery module, the lower box body is provided with a reinforcing beam extending along a second direction, the second direction is perpendicular to the up and down direction and to the first direction, in the first direction, the reinforcing beam is located between two adjacent sub-battery modules, and a first limiting groove is formed on the upper surface of the reinforcing beam, and part of the second connecting plate is accommodated in the first limiting groove.

[0018] According to some embodiments of the present invention, each of the battery modules also includes a water cooling assembly, which includes a pipe assembly and a plurality of water cooling plates connected to the pipe assembly, the pipe assembly having a water inlet joint and a water outlet joint, the number of the plurality of water cooling plates is the same as the number of the battery modules and corresponds one-to-one to each other, each of the water cooling plates is located on the upper side or the lower side of the corresponding battery module and is thermally connected to the corresponding battery module, and the plurality of water cooling plates are arranged in parallel.

[0019] According to some embodiments of the present invention, part of the pipe assembly is located on one side of the battery module along a first direction, and another part of the pipe assembly is located on one side of the battery module along a second direction, wherein the second direction is perpendicular to the up-down direction and perpendicular to the first direction.

[0020] According to some embodiments of the present invention, each of the sub-battery modules includes two layers of battery modules arranged in the up and down directions, the water cooling plate corresponding to the battery module located on the upper layer is located on the upper side of the corresponding battery module, and the water cooling plate corresponding to the battery module located on the lower layer is located on the lower side of the corresponding battery module.

[0021] According to some embodiments of the present invention, each of the battery modules includes two sub-battery modules arranged along a first direction, each of the sub-battery modules includes two layers of battery modules arranged along an up-down direction, each of the water-cooled plates has a water inlet interface and a water outlet interface, the pipeline assembly includes a water inlet pipe, a water outlet pipe, two water inlet branches and two water outlet branches, the water inlet pipe has the water inlet joint, the water outlet pipe has the water outlet joint, the two water inlet branches are connected to the water inlet pipe, and the two water outlet branches are connected to the water outlet pipe;

[0022] The upper and lower ends of one of the water inlet branch pipes are respectively connected to the water inlet interfaces of the two water cooling plates of one of the sub-battery modules in the battery module, and the upper and lower ends of the other water inlet branch pipe are respectively connected to the water inlet interfaces of the two water cooling plates of another sub-battery module in the battery module. The upper and lower ends of one of the water outlet branch pipes are respectively connected to the water outlet interfaces of the two water cooling plates of one of the sub-battery modules in the battery module, and the upper and lower ends of the other water outlet branch pipe are respectively connected to the water outlet interfaces of the two water cooling plates of another sub-battery module in the battery module.

[0023] According to some embodiments of the present invention, the battery pack includes a lower box body and an upper cover, the upper cover is arranged on the upper part of the lower box body and defines an installation cavity for accommodating the battery module, the lower box body is provided with a reinforcing beam extending along a second direction, the second direction is perpendicular to the up and down direction and to the first direction, in the first direction, the reinforcing beam is located between two adjacent sub-battery modules, and a first limiting groove is formed on the upper surface of the reinforcing beam, and the water inlet pipe and part of the water outlet pipe are accommodated in the first limiting groove.

[0024] According to some embodiments of the present invention, part of the second connecting piece is accommodated in the first limiting groove, and parts of the water inlet pipe and the water outlet pipe accommodated in the first limiting groove are located below the second connecting piece.

[0025] According to some embodiments of the present invention, the battery pack includes a plurality of battery modules arranged along a second direction, the second direction is perpendicular to the up-down direction and perpendicular to the first direction, and the water cooling assemblies of the plurality of battery modules are arranged in parallel.

[0026] According to some embodiments of the present invention, the vehicle beam includes two longitudinal beams extending along the first direction, the two longitudinal beams are arranged at intervals along the second direction, the second direction, the first direction and the up-down direction are perpendicular to each other, in the second direction, the sides of the two longitudinal beams facing away from each other are the outer sides of the longitudinal beams, the spacing of the outer sides of the longitudinal beams of the two longitudinal beams in the second direction is y, the width of each longitudinal beam in the second direction is b, the width of each battery pack in the second direction is c, the battery module located between the two longitudinal beams is a first battery module, and each layer of the battery module of the first battery module includes N groups of the battery packs arranged along the second direction, N ≥ 1 and is a positive integer;

[0027] Among them, y, b, c, and N satisfy: y-2b-N*1.05c≥50, and the units of y, b, and c are all mm.

[0028] According to some embodiments of the present invention, the vehicle beam includes two longitudinal beams extending along a first direction, the two longitudinal beams are arranged at intervals along a second direction, the second direction, the first direction and the up and down directions are perpendicular to each other, and the battery pack includes three battery modules arranged along the second direction, one of the battery modules is suitable for being located between the two longitudinal beams, and the other two battery modules are suitable for being respectively located on the sides of the two longitudinal beams away from each other, and a first avoidance groove for avoiding the longitudinal beam is defined between two adjacent battery modules.

[0029] According to some embodiments of the present invention, the battery module located between the two longitudinal beams is a first battery module, the vehicle beam includes a cross beam connected between the two longitudinal beams, and a second avoidance groove for avoiding the cross beam is formed on the first battery module.

[0030] According to some embodiments of the present invention, the vehicle beam also includes a connecting bracket, which is connected to opposite sides of the vehicle beam along the second direction, and the connecting bracket includes a connecting cross plate. The two battery modules located on the side of the two longitudinal beams facing away from each other are respectively a second battery module and a third battery module, and a third avoidance groove for avoiding the connecting cross plate is formed on the second battery module and the third battery module.

[0031] According to some embodiments of the present invention, the connecting transverse plate is located on opposite sides of the beam along the second direction, and the third avoidance groove is located on opposite sides of the second avoidance groove along the second direction and is connected to the second avoidance groove.

[0032] According to some embodiments of the present invention, each of the battery modules includes two sub-battery modules arranged along a first direction, each of the sub-battery modules includes multiple layers of battery modules arranged along an up-down direction, and the second avoidance groove or the third avoidance groove is defined between the two sub-battery modules of the battery module.

[0033] According to some embodiments of the present invention, the battery pack includes: a lower box body; an upper cover, wherein the upper cover is arranged on the upper part of the lower box body and defines three installation cavities arranged along the second direction between the upper cover and the lower box body, and the three battery modules are respectively accommodated in the three installation cavities.

[0034] According to some embodiments of the present invention, two middle partition beams extending along the first direction are provided in the lower box body, and the two middle partition beams are arranged at intervals along the second direction to divide the space in the lower box body into three installation slots arranged along the second direction, and the upper cover includes three independently formed sub-upper covers, and the three sub-upper covers correspond to the three installation slots respectively, and each sub-upper cover and the inner wall of the installation slot together define a single installation cavity.

[0035] According to some embodiments of the present invention, the lower box body is an integrally formed part; and / or each of the sub-upper covers is detachably connected to the lower box body.

[0036] A vehicle according to an embodiment of the second aspect of the present invention comprises: a vehicle body including the vehicle beam; and a battery pack according to an embodiment of the first aspect of the present invention.

[0037] The vehicle according to the embodiment of the present invention includes a battery pack according to the first embodiment of the present invention. The battery pack simplifies the electrical connection structure between battery modules, can reduce the cost of electrical connection materials between battery modules, and also reduces the space occupied by the electrical connection structure between battery modules, which is beneficial to improving the energy density of the battery pack.

[0038] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0040] Figure 1 is a separation diagram of a battery pack and a vehicle beam according to some embodiments of the present invention, wherein the battery pack has not yet been installed on the vehicle beam;

[0041] Figure 2 is an assembly diagram of a battery pack and a vehicle beam according to some embodiments of the present invention, wherein the battery pack is mounted on the vehicle beam;

[0042] Figure 3 yes Figure 2 A cross-sectional view of the battery pack and beam;

[0043] Figure 4 is a schematic diagram of a battery pack according to some embodiments of the present invention;

[0044] Figure 5 yes Figure 4 Exploded view of the battery pack;

[0045] Figure 6 yes Figure 4 A top view of the battery pack;

[0046] Figure 7 yes Figure 4 Exploded view of the battery module;

[0047] Figure 8 yes Figure 7 Schematic diagram of the battery module;

[0048] Fig. 9 yes Figure 5 Schematic diagram of the battery module;

[0049] Fig.10 yes Fig. 9 A schematic diagram of the battery module from another angle;

[0050] Fig.11 yes Figure 5 Schematic diagram of the water cooling assembly;

[0051] Fig.12 yes Fig.11 The enlarged view of point A in the middle;

[0052] Fig.13 yes Fig.11 Enlarged view of point B in the middle.

[0053] Reference numerals:

[0054] 100. Battery pack;

[0055] 10. Battery module; 11. First avoidance groove; 12. Second avoidance groove; 13. Third avoidance groove; 14. Battery module; 15. Battery pack; 16. Battery cell; 17. First battery module; 18. Second battery module; 19. Third battery module; 20. Sub-battery module;

[0056] 30. Lower box; 31. Upper cover; 32. Installation cavity; 33. Middle partition beam; 34. Installation slot; 35. Sub-upper cover; 36. Reinforcement beam; 37. First limit slot

[0057] 40. Car beam; 41. Longitudinal beam; 42. Cross beam; 43. Connecting bracket; 44. Connecting cross plate; 45. Outer side of longitudinal beam;

[0058] 50, first connecting piece; 51, second connecting piece; 52, third connecting piece; 53, first connecting section; 54, second connecting section; 55, third connecting section; 56, fourth connecting section; 57, fifth connecting section; 58, sixth connecting section;

[0059] 60. Limiting structure; 61. Limiting perforation;

[0060] 70. Water cooling assembly; 71. Water cooling plate; 72. Pipe assembly; 73. Water inlet interface; 74. Water outlet interface; 75. Water inlet pipe; 76. Water outlet pipe; 77. Water inlet branch pipe; 78. Water outlet branch pipe; 79. Water inlet joint; 80. Water outlet joint. DETAILED DESCRIPTION

[0061] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0062] Reference below Figure 1-Figure 13 A battery pack 100 and a vehicle according to an embodiment of the present invention are described.

[0063] The battery pack 100 according to the first embodiment of the present invention is suitable for being installed on the vehicle beam 40 of the vehicle, referring to Figure 4 The battery pack 100 includes at least one battery module 10, each battery module 10 includes a plurality of sub-battery modules 20 arranged along a first direction (eg, direction e1 in the drawing), and each sub-battery module 20 includes a multi-layer battery module 14 arranged along an up-and-down direction.

[0064] The battery pack 100 may include one or more battery modules 10. For example, the battery pack 100 includes three battery modules 10, and the three battery modules 10 are arranged in the second direction, wherein one battery module 10 is suitable for being located between two longitudinal beams 41, and the other two battery modules 10 are suitable for being located on the sides of the two longitudinal beams 41 that are away from each other. By making the battery pack 100 include multiple battery modules 10 and one battery module 10 is located between the two longitudinal beams 41, the space between the two longitudinal beams 41 can be fully utilized, thereby improving the space utilization rate of the battery pack 100; by making the other two battery modules 10 be located on the sides of the two longitudinal beams 41 that are away from each other, the space on both sides of the longitudinal beams 41 along the second direction (for example, the e2 direction in the figure) can be fully utilized, thereby improving the space utilization rate of the battery pack 100. The second direction is perpendicular to the up-down direction.

[0065] For example, a plurality of battery modules 10 are connected in parallel. By connecting the battery modules 10 in parallel, the battery pack 100 can provide a larger current to meet the needs of the vehicle.

[0066] For example, multiple battery modules 14 in each battery module 10 are connected in series. By connecting the battery modules 14 in a single battery module 10 in series, the battery pack 100 can provide a higher voltage to meet the needs of the vehicle.

[0067] Reference Fig. 9 and Fig.10 , the two adjacent layers of battery modules 14 of each sub-battery module 20 are electrically connected through the first connecting piece 50, and the battery modules 14 located in the same layer of the two adjacent sub-battery modules 20 are electrically connected through the second connecting piece 51, and the first direction is perpendicular to the up-down direction. By making the two adjacent layers of battery modules 14 of each sub-battery module 20 electrically connected through the first connecting piece 50, and the battery modules 14 located in the same layer of the two adjacent sub-battery modules 20 are electrically connected through the second connecting piece 51, the electrical connection structure between the battery modules 14 can be simplified, the connection harness between the battery modules 14 and the connector corresponding to the connection harness are omitted, and the cost of the electrical connection material between the battery modules 14 is reduced, thereby reducing the cost of the battery; in addition, the space occupied by the connecting piece is small, and the battery modules 14 are connected through the connecting piece, which reduces the space occupied by the electrical connection structure between the battery modules 14, increases the space utilization of the battery pack 100, and improves the energy density of the battery pack 100.

[0068] The battery pack 100 according to the embodiment of the present invention is suitable for being installed on the beam 40 of a vehicle. The battery pack 100 includes a plurality of sub-battery modules 20, and the two adjacent layers of battery modules 14 of each sub-battery module 20 are electrically connected via a first connecting piece 50, and the battery modules 14 located on the same layer in two adjacent sub-battery modules 20 are electrically connected via a second connecting piece 51. This simplifies the electrical connection structure between the battery modules 14, eliminates the connection harness between the battery modules 14 and the connectors corresponding to the connection harness, reduces the cost of electrical connection materials between the battery modules 14, and reduces the space occupied by the electrical connection structure between the battery modules 14. The overall structure of the battery pack 100 is more compact, which is beneficial to improving the energy density of the battery pack 100.

[0069] According to some embodiments of the present invention, referring to Fig.10, the first connecting piece 50 is located at least on one side of the battery module 14 along the first direction, and the second connecting piece 51 is located between the two sub-battery modules 20 in the first direction. By making the first connecting piece 50 located at least on one side of the battery module 14 along the first direction, it is more convenient and direct to connect the first connecting piece 50 to different battery modules 14; by making the second connecting piece 51 located between the two sub-battery modules 20, it is convenient to realize electrical connection between the two sub-battery modules 20, and make full use of the space between the sub-battery modules 20, reducing the occupation of other spaces.

[0070] According to some embodiments of the present invention, referring to Fig.10 , a limiting structure 60 is provided on at least one side of the battery module 14 along the first direction, and the limiting structure 60 cooperates with the first connecting piece 50 to limit the first connecting piece 50. By providing the limiting structure 60 on at least one side of the battery module 14 along the first direction, and making the limiting structure 60 cooperate with the first connecting piece 50, the position of the first connecting piece 50 can be fixed, and the first connecting piece 50 is prevented from moving, resulting in failure of the electrical connection between the battery modules 14 and causing a circuit breaker.

[0071] According to some embodiments of the present invention, referring to Fig.10 A limiting through hole 61 is formed on the limiting structure 60, and the first connecting piece 50 is inserted through the limiting through hole 61. By providing the limiting through hole 61 on the limiting structure 60 and inserting the first connecting piece 50 through the limiting through hole 61, the limiting structure 60 can limit the first connecting piece 50 more fully, and the position of the first connecting piece 50 can be more stable.

[0072] According to some embodiments of the present invention, referring to Fig.10 The first connecting piece 50 includes a first connecting segment 53, a second connecting segment 54 and a third connecting segment 55 connected in sequence, the first connecting segment 53 and the third connecting segment 55 both extend in the up-down direction, the second connecting segment 54 extends in the second direction, the second connecting segment 54 is connected between the lower end of the first connecting segment 53 and the upper end of the third connecting segment 55, the second direction is perpendicular to the up-down direction and perpendicular to the first direction, the first connecting segment 53 and the third connecting segment 55 are respectively connected to two adjacent layers of battery modules 14 in the sub-battery module 20. For example, the first connecting segment 53 connects the battery module 14 of the upper layer, the second connecting segment 54 is placed horizontally and extends in the second direction, and the third connecting segment 55 connects the battery module 14 of the lower layer. By making the first connecting piece 50 include the first connecting segment 53 and the third connecting segment 55 extending in the up-down direction, and also including the second connecting segment 54 extending in the second direction, the first connecting piece 50 can be conveniently connected to different battery modules 14.

[0073] According to some embodiments of the present invention, referring to Fig. 9, the highest position of the second connecting piece 51 is lower than the upper surface of the battery module 10. By making the highest position of the second connecting piece 51 lower than the upper surface of the battery module 10, the second connecting piece 51 can be prevented from interfering with other components, ensuring that the second connecting piece 51 can be connected to the battery module 14 without interfering with the installation of other components. For example, when the battery pack 100 includes an upper cover 31, the second connecting piece 51 can be prevented from interfering with the upper cover 31, or when the vehicle beam 40 includes a crossbeam 42, the second connecting piece 51 can be prevented from interfering with the crossbeam 42.

[0074] According to some embodiments of the present invention, referring to Fig.10 The battery module 14 includes multiple rows of battery packs 15 arranged along the second direction, and two adjacent battery packs 15 in the battery module 14 are electrically connected via a third connecting piece 52. By electrically connecting the multiple rows of battery packs 15 arranged in the second direction via the third connecting piece 52, the battery packs 15 arranged in the second direction can be electrically connected.

[0075] The third connection piece 52 is located at least on one side of the battery module 14 along the first direction. By locating the third connection piece 52 at least on one side of the battery module 14 along the first direction, the third connection piece 52 can be connected to different battery packs 15 more conveniently and directly.

[0076] For example, the battery pack 15 may include a plurality of battery cells 16 , and the plurality of battery cells 16 of the battery pack 15 are arranged along a first direction.

[0077] According to some embodiments of the present invention, referring to Fig.10 The third connecting piece 52 is in a "U" shape. The two connecting ends of the "U"-shaped third connecting piece 52 are respectively connected to two battery packs 15, so as to realize electrical connection of multiple battery packs 15. By making the third connecting piece 52 in a "U" shape, the third connecting piece 52 can avoid interference with other structures such as the fixing structure between the battery packs 15 while realizing electrical connection of multiple battery packs 15, thereby ensuring that the battery packs 15 can be smoothly connected.

[0078] According to some embodiments of the present invention, referring to Figure 5 , multiple battery modules 14 of each battery module 10 are connected in series. By connecting multiple battery modules 14 of each battery module 10 in series, the voltage of the battery module 10 can be increased to meet the needs of electrical components. The battery pack 100 includes multiple battery modules 10 arranged along a second direction, and the multiple battery modules 10 are connected in parallel. The second direction is perpendicular to the up-down direction and perpendicular to the first direction. By connecting multiple battery modules 10 of the battery pack 100 in parallel, the current of the battery pack 100 can be increased to meet the needs of electrical equipment.

[0079] For example, refer to Fig. 9Each battery module 10 includes two sub-battery modules 20 arranged along a first direction, and each sub-battery module 20 includes two layers of battery modules 14 arranged along an up-and-down direction.

[0080] According to some embodiments of the present invention, referring to Fig. 9 The second connecting piece 51 connected between the battery modules 14 located at the upper layer includes a fourth connecting segment 56, a fifth connecting segment 57 and a sixth connecting segment 58 connected in sequence, the fourth connecting segment 56 and the sixth connecting segment 58 both extend in the up-down direction, the fifth connecting segment 57 extends in the first direction, the fifth connecting segment 57 is connected between the lower end of the fourth connecting segment 56 and the lower end of the sixth connecting segment 58, and the fourth connecting segment 56 and the sixth connecting segment 58 are respectively connected to the two battery modules 14 located at the upper layer in the battery module 10. By making the battery module 14 located at the upper layer include the fourth connecting segment 56, the fifth connecting segment 57 and the sixth connecting segment 58, and making the fourth connecting segment 56 and the sixth connecting segment 58 both extend in the up-down direction, and the fifth connecting segment 57 extend in the first direction, the second connecting piece 51 can be prevented from interfering with other components, ensuring that the second connecting piece 51 can connect the battery module 14 without interfering with the installation of other components.

[0081] The second connecting piece 51 connected between the battery modules 14 located in the lower layer extends along the first direction. By extending the second connecting piece 51 connected between the battery modules 14 located in the lower layer along the first direction, the length of the second connecting piece 51 connected between the battery modules 14 located in the lower layer can be reduced, and the material of the second connecting piece 51 can be saved.

[0082] According to some embodiments of the present invention, referring to Figure 5 The battery pack 100 includes a lower box body 30 and an upper cover 31. The upper cover 31 is provided on the upper part of the lower box body 30 and defines a mounting cavity 32 for accommodating the battery module 10. A reinforcing beam 36 extending along a second direction is provided in the lower box body 30. The second direction is perpendicular to the up-down direction and the first direction. In the first direction, the reinforcing beam 36 is located between two adjacent sub-battery modules 20. A first limiting groove 37 is formed on the upper surface of the reinforcing beam 36. Part of the second connecting piece 51 is accommodated in the first limiting groove 37. By providing the reinforcing beam 36 in the box body, the structural strength of the lower box body 30 can be improved. In addition, by providing the first limiting groove 37 on the reinforcing beam 36 and accommodating part of the second connecting piece 51 in the first limiting groove 37, the side wall of the first limiting groove 37 can limit the second connecting piece 51 in the first direction, thereby preventing the second connecting piece 51 from moving in the battery pack 100 and causing the connection between the battery modules 14 to fail, and the overall structure can be made compact.

[0083] According to some embodiments of the present invention, referring to Figure 5 and Fig.11Each battery module 10 further includes a water cooling assembly 70, the water cooling assembly 70 includes a pipe assembly 72 and a plurality of water cooling plates 71 connected to the pipe assembly 72, the pipe assembly 72 has a water inlet joint 79 and a water outlet joint 80, and the number of the plurality of water cooling plates 71 is the same as the number of the battery modules 14 and they correspond one to one. By making each water cooling plate 71 the same as the number of the corresponding battery modules 14 and they correspond one to one, it can be ensured that each battery module 14 can be fully cooled by the water cooling plate 71.

[0084] Each water cooling plate 71 is located on the upper side or the lower side of the corresponding battery module 14 and is thermally connected to the corresponding battery module 14, and multiple water cooling plates 71 are arranged in parallel. By placing multiple water cooling plates 71 in parallel, it can be ensured that the temperature of the heat exchange medium flowing into each water cooling plate 71 is low, and each water cooling plate 71 has a strong heat exchange capacity, so that the cooling effect of the water cooling plate 71 is more sufficient.

[0085] According to some embodiments of the present invention, referring to Fig.11 , part of the pipeline assembly 72 is located on one side of the battery module 14 along the first direction, and the other part of the pipeline assembly 72 is located on one side of the battery module 14 along the second direction, and the second direction is perpendicular to the up-down direction and perpendicular to the first direction. By making part of the pipeline assembly 72 located on one side of the battery module 14 along the first direction and the other part of the pipeline assembly 72 located on one side of the battery module 14 along the second direction, the pipeline assembly 72 can make full use of the gap space between the battery modules 14, thereby increasing the space utilization rate of the battery pack 100.

[0086] According to some embodiments of the present invention, referring to Figure 5 , each sub-battery module 20 includes two layers of battery modules 14 arranged in the up-down direction. The water-cooling plate 71 corresponding to the battery module 14 located in the upper layer is located on the upper side of the corresponding battery module 14, and the water-cooling plate 71 corresponding to the battery module 14 located in the lower layer is located on the lower side of the corresponding battery module 14. By making the water-cooling plate 71 corresponding to the battery module 14 located in the upper layer be located on the upper side of the corresponding battery module 14, and the water-cooling plate 71 corresponding to the battery module 14 located in the lower layer be located on the lower side of the corresponding battery module 14, the water-cooling plate 71 can be fixed in the upper cover 31 or the lower box 30, so that the water-cooling plate 71 can be more easily limited and fixed.

[0087] According to some embodiments of the present invention, referring to Fig.12 and Fig.13Each battery module 10 includes two sub-battery modules 20 arranged along the first direction, each sub-battery module 20 includes two layers of battery modules 14 arranged along the up-down direction, each water-cooled plate 71 has a water inlet interface 73 and a water outlet interface 74, the pipeline assembly 72 includes a water inlet pipe 75, a water outlet pipe 76, two water inlet branches 77 and two water outlet branches 78, the water inlet pipe 75 has a water inlet joint 79, the water outlet pipe 76 has a water outlet joint 80, the two water inlet branches 77 are connected to the water inlet pipe 75, and the two water outlet branches 78 are connected to the water outlet pipe 76; by connecting the two water inlet branches 77 to the water inlet pipe 75 and the two water outlet branches 78 to the water outlet pipe 76, the pipeline assembly 72 can realize the parallel connection of the water-cooled plates 71 corresponding to different battery modules 14, thereby ensuring that each water-cooled plate 71 has a strong heat exchange capacity and making the cooling effect of the water-cooled plate 71 more sufficient.

[0088] The upper and lower ends of one of the water inlet branch pipes 77 are respectively connected to the water inlet interfaces 73 of the two water cooling plates 71 of a sub-battery module 20 in the battery module 10, and the upper and lower ends of the other water inlet branch pipe 77 are respectively connected to the water inlet interfaces 73 of the two water cooling plates 71 of another sub-battery module 20 in the battery module 10. By connecting the two ends of one of the water inlet branch pipes 77 to the water inlet interfaces 73 of the two water cooling plates 71 of a sub-battery module 20 in the battery module 10, and connecting the water inlet branch pipe 77 to the water inlet pipe 75, the water inlet interfaces 73 of the two water cooling plates 71 can be supplied with water, so that the two water cooling plates 71 are connected in parallel, ensuring that each water cooling plate 71 of the sub-battery module 20 has a strong heat exchange capacity, so that the cooling effect of the water cooling plate 71 is more sufficient. By connecting the two ends of another water inlet branch pipe 77 to the water inlet interfaces 73 of the two water cooling plates 71 of another sub-battery module 20 in the battery module 10, and connecting the water inlet branch pipe 77 to the water inlet pipe 75, the water inlet interfaces 73 of the two water cooling plates 71 of the other sub-battery module 20 can be supplied with water, ensuring that the water inlet interfaces 73 of the two water cooling plates 71 of all sub-battery modules 20 can be supplied with water, so that the water cooling plates 71 are all connected in parallel, ensuring that each water cooling plate 71 of this sub-battery module 20 has a strong heat exchange capacity, so that the cooling effect of the water cooling plate 71 is more sufficient.

[0089] The upper and lower ends of one of the water outlet branches 78 are respectively connected to the water outlet interfaces 74 of the two water cooling plates 71 of a sub-battery module 20 in the battery module 10, and the upper and lower ends of the other water outlet branch pipe 78 are respectively connected to the water outlet interfaces 74 of the two water cooling plates 71 of another sub-battery module 20 in the battery module 10. By connecting the two ends of one of the water outlet branches 78 to the water outlet interfaces 74 of the two water cooling plates 71 of a sub-battery module 20 in the battery module 10, and connecting the water outlet branch pipe 78 to the water outlet pipe 76, the water outlet interfaces 74 of the two water cooling plates 71 can be supplied with water, so that the two water cooling plates 71 are connected in parallel, ensuring that each water cooling plate 71 of the sub-battery module 20 can discharge the heat exchange medium after heat exchange, so that the cooling effect of the water cooling plate 71 is more sufficient. By connecting the two ends of another water outlet branch pipe 78 to the water outlet interfaces 74 of the two water cooling plates 71 of another sub-battery module 20 in the battery module 10, and the water outlet branch pipe 78 is connected to the water outlet pipe 76, each water cooling plate 71 of another sub-battery module 20 can discharge the heat exchange medium after heat exchange, ensuring that each water cooling plate 71 corresponding to all sub-battery modules 20 can discharge the heat exchange medium after heat exchange, so that the water cooling plates 71 are all connected in parallel, ensuring that each water cooling plate 71 of this sub-battery module 20 has a strong heat exchange capacity, so that the cooling effect of the water cooling plate 71 is more sufficient.

[0090] Optionally, the water inlet branch pipe 77 may be a tee pipe, and the water outlet branch pipe 78 may be a tee pipe.

[0091] In the above embodiment, the coolant can enter the water inlet pipe 75 from the water inlet joint 79, and the coolant entering the water inlet pipe 75 can flow into the two water inlet branches 77 respectively. The coolant entering the water inlet branches 77 respectively enters the two water cooling plates 71 corresponding to the upper and lower layers of battery modules 14 in the same sub-battery module 20. During the flow of the coolant in the flow channel in the water cooling plate 71, the temperature of the battery module 14 can be adjusted, for example, the heat generated by the battery module 14 is taken away. The coolant flowing in the two water cooling plates 71 corresponding to the upper and lower layers of battery modules 14 in the same sub-battery module 20 flows out of the water cooling plate 71 and flows into the water outlet branch 78, and then the coolant flows into the water outlet pipe 76 from the two water outlet branches 78, and then flows out from the water outlet joint 80.

[0092] According to some embodiments of the present invention, referring to Figure 5 and Fig.12The battery pack 100 includes a lower box 30 and an upper cover 31. The upper cover 31 is disposed on the upper portion of the lower box 30 and defines a mounting cavity 32 for accommodating the battery module 10. A reinforcing beam 36 extending along a second direction is disposed in the lower box 30. The second direction is perpendicular to the up-down direction and the first direction. In the first direction, the reinforcing beam 36 is located between two adjacent sub-battery modules 20. By disposing the reinforcing beam 36 in the lower box 30 of the battery pack 100, the strength of the lower box 30 can be increased, the supporting and fixing capability of the lower box 30 can be increased, and the battery module 14 can be more fully fixed.

[0093] The upper surface of the reinforcing beam 36 is formed with a first limiting groove 37, and parts of the water inlet pipe 75 and the water outlet pipe 76 are accommodated in the first limiting groove 37. By forming the first limiting groove 37 on the upper surface of the reinforcing beam 36 and accommodating parts of the water inlet pipe 75 and the water outlet pipe 76 in the first limiting groove 37, the water inlet pipe 75 and the water outlet pipe 76 can be limited in the first direction. When the water inlet pipe 75 and the water outlet pipe 76 move along the first direction, the pipe walls of the water inlet pipe 75 and the water outlet pipe 76 abut against the side walls of the first limiting groove 37, preventing the water inlet pipe 75 and the water outlet pipe 76 from moving, avoiding the water inlet pipe 75 and the water outlet pipe 76 from interfering with the work of other components, making the water inlet pipe 75 and the water outlet pipe 76 more fully fixed, and making the overall structure compact.

[0094] According to some embodiments of the present invention, part of the second connecting piece 51 is accommodated in the first limiting groove 37, and the part of the water inlet pipe 75 and the water outlet pipe 76 accommodated in the first limiting groove 37 is located below the second connecting piece 51. By accommodating part of the second connecting piece 51 in the first limiting groove 37, the second connecting piece 51 can be limited by the first limiting groove 37 in the first direction. When the second connecting piece 51 moves along the first direction, the side wall of the second connecting piece 51 abuts against the side wall of the first limiting groove 37, thereby preventing the electrical connection between the battery modules 14 from failing due to the movement of the second connecting piece 51. By accommodating the part of the water inlet pipe 75 and the water outlet pipe 76 accommodated in the first limiting groove 37 below the second connecting piece 51, the interference between the water inlet pipe 75 and the water outlet pipe 76 and the second connecting piece 51 can be avoided. And the overall structure can be made compact.

[0095] According to some embodiments of the present invention, reference Figure 5 The battery pack 100 includes a plurality of battery modules 10 arranged along a second direction, the second direction is perpendicular to the up-down direction and perpendicular to the first direction, and the water cooling components 70 of the plurality of battery modules 10 are arranged in parallel. By arranging the water cooling components 70 of the plurality of battery modules 10 in parallel, it is ensured that each battery module 14 in the battery module 10 can be sufficiently cooled and heat exchanged, thereby ensuring the safety of the battery pack 100.

[0096] According to some embodiments of the present invention, referring to Figure 3 , the vehicle beam 40 includes two longitudinal beams 41 extending in the first direction, the two longitudinal beams 41 are arranged at intervals in the second direction, the second direction, the first direction and the up-down direction are perpendicular to each other, in the second direction, the sides of the two longitudinal beams 41 that are away from each other are longitudinal beam outer sides 45, the spacing of the longitudinal beam outer sides 45 of the two longitudinal beams 41 in the second direction is y, the width of each longitudinal beam in the second direction is b, the width of each battery pack 15 in the second direction is c, the battery module 10 located between the two longitudinal beams 41 is a first battery module 17, and each layer of battery modules 14 of the first battery module 17 includes N groups of battery packs 15 arranged in the second direction, N ≥ 1 and is a positive integer;

[0097] Among them, y, b, c, and N satisfy: y-2b-N*1.05c≥50, and the units of y, b, and c are all mm. By making y, b, c, and N satisfy: y-2b-N*1.05c≥50, according to the width of the space defined between the two longitudinal beams 41 in the second direction, a battery module 14 consisting of battery packs 15 of a suitable size and a suitable number is selected, so that the space between the two longitudinal beams 41 can be fully utilized to accommodate the battery module 14, so that the first battery module 17 can be smoothly installed between the two longitudinal beams 41, and interference between the first battery module 17 and the longitudinal beams 41 is avoided.

[0098] For example, the value range of b is 50 mm to 150 mm. For example, b=80 mm. For example, N=3.

[0099] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The vehicle beam 40 includes two longitudinal beams 41 extending in the first direction, the two longitudinal beams 41 are arranged at intervals in the second direction, the second direction, the first direction and the up-down direction are perpendicular to each other, and the battery pack 100 includes three battery modules 10 arranged in the second direction, one of the battery modules 10 is suitable for being located between the two longitudinal beams 41, and the other two battery modules 10 are suitable for being located on the sides of the two longitudinal beams 41 away from each other. By locating one of the battery modules 10 of the battery pack 100 between the two longitudinal beams 41, the battery pack 100 can make full use of the space between the longitudinal beams 41, thereby increasing the space utilization rate of the battery pack 100.

[0100] A first avoidance groove 11 for avoiding the longitudinal beam 41 is defined between two adjacent battery modules 10. By positioning one of the three battery modules 10 of the battery pack 100 between the two longitudinal beams 41, and positioning the other two battery modules 10 on the opposite sides of the two longitudinal beams 41, and defining a first avoidance groove 11 for avoiding the longitudinal beam 41 between two adjacent battery modules 10, interference between the battery pack 100 and the longitudinal beam 41 can be avoided, and the battery pack 100 can be directly fixed by the vehicle beam 40, avoiding the use of a separate frame as a fixed connection component, and the connection component occupies less space, which can increase the space utilization of the battery pack 100.

[0101] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The battery module 10 located between the two longitudinal beams 41 is the first battery module 17. The vehicle beam 40 includes a cross beam 42 connected between the two longitudinal beams 41. The first battery module 17 is formed with a second avoidance groove 12 for avoiding the cross beam 42. By providing the second avoidance groove 12 for avoiding the cross beam 42 on the first battery module 17, the cross beam 42 is accommodated in the second avoidance groove 12, so that the first battery module 17 and the cross beam 42 can be prevented from interfering with each other, so that the first battery module 17 can be smoothly installed and fixed on the vehicle beam 40.

[0102] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The vehicle beam 40 further includes a connecting bracket 43, which is connected to the two opposite sides of the vehicle beam 40 along the second direction. The connecting bracket 43 includes a connecting cross plate 44. The two battery modules 10 located on the two sides of the two longitudinal beams 41 away from each other are the second battery module 18 and the third battery module 19. By providing the connecting bracket 43 on the opposite sides of the vehicle along the second direction, both sides of the second battery module 18 and the third battery module 19 can be fixed, so that the connection between the second battery module 18 and the third battery module 19 and the vehicle is more stable. For example, the left side of the second battery module 18 is connected to the connecting bracket 43, and the right side of the second battery module 18 is connected to the vehicle beam 40. By making the connecting bracket 43 include a connecting cross plate, the connecting bracket 43 can be connected and fixed to the longitudinal beam 41, so that the fixing of the connecting bracket 43 is more sufficient.

[0103] The second battery module 18 and the third battery module 19 are both formed with a third avoidance groove 13 for avoiding the connecting transverse plate 44. When the battery is installed on the vehicle beam 40, the connecting transverse plate 44 is accommodated in the third avoidance groove 13. By providing the third avoidance groove 13 on the second battery module 18 and the third battery module 19, the third avoidance groove 13 is used to avoid the connecting transverse plate 44, so that the second battery module 18 and the third battery module 19 can be prevented from interfering with the connecting transverse plate, so that the second battery module 18 and the third battery module 19 can be smoothly installed on the vehicle beam 40.

[0104] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The connecting horizontal plate 44 is located at two opposite sides of the cross beam 42 along the second direction, and the third avoidance groove 13 is located at two opposite sides of the second avoidance groove 12 along the second direction and is connected to the second avoidance groove 12. By connecting the third avoidance groove 13 with the second avoidance groove 12, avoidance grooves can be provided in the second direction, so that the connecting horizontal plate and the cross beam 42 do not interfere with the battery module 10.

[0105] According to some embodiments of the present invention, referring to Figure 1-Figure 4 Each battery module 10 includes two sub-battery modules 20 arranged along the first direction, each sub-battery module 20 includes a multi-layer battery module 14 arranged along the up-down direction, and a second escape groove 12 or a third escape groove 13 is defined between the two sub-battery modules 20 of the battery module 10. When the battery module 10 is installed on the vehicle beam 40, the crossbeam 42 is accommodated in the second escape groove 12, and the connecting cross plate 44 is accommodated in the third escape groove 13. By defining the second escape groove 12 or the third escape groove 13 between the battery modules 10, the crossbeam 42 and the connecting cross plate do not interfere with the battery module 10, ensuring that the battery module 10 can be smoothly installed and fixed.

[0106] According to some embodiments of the present invention, referring to Figure 5 The battery pack 100 includes: a lower box body 30 and an upper cover 31. The upper cover 31 is disposed on the upper part of the lower box body 30 and defines three installation cavities 32 arranged along the second direction between the upper cover 31 and the lower box body 30. The three battery modules 10 are respectively accommodated in the three installation cavities 32. The three installation cavities 32 are defined by the lower box body 30 and the upper cover 31. The three battery modules 10 are respectively accommodated in the three installation cavities 32 and together form a large battery pack 100. By combining multiple battery modules 10 to form a large battery pack 100, the electrical connection between the battery modules 10 is relatively simple, which can reduce the use of wiring harnesses and connectors and reduce costs; reduce the space occupied by the battery pack 100; in addition, the connection between the water-cooling structures in the battery pack 100 is also simpler, which reduces the space occupied by the battery pack 100.

[0107] According to some embodiments of the present invention, referring to Figure 5 , two middle partition beams 33 extending along the first direction are arranged in the lower box body 30, and the two middle partition beams 33 are arranged at intervals along the second direction to divide the space in the lower box body 30 into three mounting slots 34 arranged along the second direction, and the upper cover 31 includes three independently formed sub-upper covers 35, and the three sub-upper covers 35 correspond to the three mounting slots 34 respectively, and each sub-upper cover 35 and the inner wall of the mounting slot 34 jointly define a single mounting cavity 32. By making each sub-upper cover 35 and the inner wall of the mounting slot 34 jointly define a single mounting cavity 32, each battery module 10 can be accommodated in a single mounting cavity 32, so that the battery module 10 can be more fully limited, and the battery module 10 is prevented from moving in the battery pack 100 and causing connection failure.

[0108] According to some embodiments of the present invention, the lower box 30 is an integrally formed part. By forming the lower box 30 in one piece, the number of parts of the battery pack 100 can be reduced, the assembly difficulty can be reduced, and the battery module 10 can be more easily formed into a whole.

[0109] According to some embodiments of the present invention, each upper sub-cover 35 is detachably connected to the lower box body 30. By making each upper sub-cover 35 detachably connected to the lower box body 30, when the battery module 10 needs maintenance or repair, the corresponding upper sub-cover 35 can be removed to replace or repair the corresponding battery module 10, which is easier to repair.

[0110] The vehicle according to the second embodiment of the present invention comprises: a vehicle body and a battery pack 100 according to the first embodiment of the present invention, wherein the vehicle body comprises a vehicle beam 40 .

[0111] The vehicle may be a heavy truck.

[0112] According to the vehicle of the embodiment of the present invention, by including the battery pack 100 according to the first aspect of the embodiment of the present invention, the battery pack 100 simplifies the electrical connection structure between the battery modules 14, which can reduce the cost of electrical connection materials between the battery modules 14, and also reduce the space occupied by the electrical connection structure between the battery modules 14, which is beneficial to improving the energy density of the battery pack 100.

[0113] In the description of the present invention, 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", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0114] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0115] In the description of the present invention, "plurality" means two or more.

[0116] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0117] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0119] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: Suitable for installation on a beam of a vehicle, the battery pack includes at least one battery module, each of the battery modules includes a plurality of sub-battery modules arranged along a first direction, each of the sub-battery modules includes a plurality of layers of battery modules arranged along an up-down direction, two adjacent layers of battery modules of each sub-battery module are electrically connected via a first connecting piece, and the battery modules located on the same layer of two adjacent sub-battery modules are electrically connected via a second connecting piece, and the first direction is perpendicular to the up-down direction.

2. The battery pack according to claim 1, characterized in that: The first connecting piece is located on at least one side of the battery module along the first direction, and the second connecting piece is located between two of the sub-battery modules in the first direction.

3. The battery pack according to claim 2, characterized in that: The battery module is provided with a limiting structure on at least one side along the first direction, and the limiting structure cooperates with the first connecting piece to limit the first connecting piece; a limiting through hole is formed on the limiting structure, and the first connecting piece is penetrated through the limiting through hole.

4. The battery pack according to claim 2, characterized in that: The battery module includes multiple rows of battery groups arranged along a second direction, and two adjacent battery groups in the battery module are electrically connected via a third connecting piece, and the third connecting piece is located on at least one side of the battery module along the first direction, and the second direction is perpendicular to the up-down direction and perpendicular to the first direction.

5. The battery pack according to claim 1, characterized in that: A plurality of the battery modules of each battery module are connected in series, the battery pack comprises a plurality of the battery modules arranged along a second direction, and the plurality of the battery modules are connected in parallel, the second direction is perpendicular to the up-down direction and perpendicular to the first direction; Each of the battery modules includes two sub-battery modules arranged along the first direction, and each of the sub-battery modules includes two layers of battery modules arranged along an up-and-down direction.

6. The battery pack according to claim 1, characterized in that: The battery pack includes a lower box body and an upper cover, the upper cover is arranged on the upper part of the lower box body and defines a mounting cavity for accommodating the battery module, the lower box body is provided with a reinforcing beam extending along a second direction, the second direction is perpendicular to the up-down direction and to the first direction, in the first direction, the reinforcing beam is located between two adjacent sub-battery modules, a first limiting groove is formed on the upper surface of the reinforcing beam, and part of the second connecting piece is accommodated in the first limiting groove.

7. The battery pack according to claim 1, characterized in that: Each of the battery modules also includes a water cooling assembly, which includes a pipeline assembly and a plurality of water cooling plates connected to the pipeline assembly, wherein the pipeline assembly has a water inlet joint and a water outlet joint, the number of the plurality of water cooling plates is the same as the number of the battery modules and corresponds one to one to each other, each of the water cooling plates is located on the upper side or the lower side of the corresponding battery module and is thermally connected to the corresponding battery module, and the plurality of water cooling plates are arranged in parallel.

8. The battery pack according to claim 7, characterized in that: A portion of the pipeline assembly is located on one side of the battery module along a first direction, and another portion of the pipeline assembly is located on one side of the battery module along a second direction, wherein the second direction is perpendicular to the up-down direction and perpendicular to the first direction; And / or, each of the sub-battery modules includes two layers of battery modules arranged in the up and down directions, the water cooling plate corresponding to the battery module located on the upper layer is located on the upper side of the corresponding battery module, and the water cooling plate corresponding to the battery module located on the lower layer is located on the lower side of the corresponding battery module.

9. The battery pack according to claim 7, characterized in that: Each of the battery modules comprises two sub-battery modules arranged along a first direction, each of the sub-battery modules comprises two layers of battery modules arranged along an up-down direction, each of the water-cooled plates comprises a water inlet interface and a water outlet interface, the pipeline assembly comprises a water inlet pipe, a water outlet pipe, two water inlet branches and two water outlet branches, the water inlet pipe comprises a water inlet joint, the water outlet pipe comprises a water outlet joint, the two water inlet branches are connected to the water inlet pipe, and the two water outlet branches are connected to the water outlet pipe; The upper and lower ends of one of the water inlet branch pipes are respectively connected to the water inlet interfaces of the two water cooling plates of one of the sub-battery modules in the battery module, and the upper and lower ends of the other water inlet branch pipe are respectively connected to the water inlet interfaces of the two water cooling plates of another sub-battery module in the battery module. The upper and lower ends of one of the water outlet branch pipes are respectively connected to the water outlet interfaces of the two water cooling plates of one of the sub-battery modules in the battery module, and the upper and lower ends of the other water outlet branch pipe are respectively connected to the water outlet interfaces of the two water cooling plates of another sub-battery module in the battery module.

10. The battery pack according to claim 9, characterized in that: The battery pack includes a lower box body and an upper cover, the upper cover is arranged on the upper part of the lower box body and defines a mounting cavity for accommodating the battery module, the lower box body is provided with a reinforcing beam extending along a second direction, the second direction is perpendicular to the up-down direction and to the first direction, in the first direction, the reinforcing beam is located between two adjacent sub-battery modules, a first limiting groove is formed on the upper surface of the reinforcing beam, and the water inlet pipe and part of the water outlet pipe are accommodated in the first limiting groove.

11. The battery pack according to claim 10, characterized in that: Part of the second connecting piece is accommodated in the first limiting groove, and parts of the water inlet pipe and the water outlet pipe accommodated in the first limiting groove are located below the second connecting piece.

12. The battery pack according to claim 7, characterized in that: The battery pack includes a plurality of battery modules arranged along a second direction, the second direction is perpendicular to the up-down direction and perpendicular to the first direction, and the water cooling assemblies of the plurality of battery modules are arranged in parallel.

13. The battery pack according to claim 1, characterized in that: The vehicle beam includes two longitudinal beams extending along the first direction, the two longitudinal beams are arranged at intervals along the second direction, the second direction, the first direction and the up-down direction are perpendicular to each other, in the second direction, the sides of the two longitudinal beams facing away from each other are the outer sides of the longitudinal beams, the spacing of the outer sides of the longitudinal beams of the two longitudinal beams in the second direction is y, the width of each longitudinal beam in the second direction is b, the width of each battery pack in the second direction is c, the battery module located between the two longitudinal beams is a first battery module, and each layer of the battery module of the first battery module includes N groups of the battery packs arranged along the second direction, N ≥ 1 and is a positive integer; Among them, y, b, c, and N satisfy: y-2b-N*1.05c≥50, and the units of y, b, and c are all mm.

14. The battery pack according to claim 1, characterized in that: The vehicle beam comprises two longitudinal beams extending in a first direction, the two longitudinal beams are arranged at intervals in a second direction, the second direction, the first direction and the up-down direction are perpendicular to each other, the battery pack comprises three battery modules arranged in the second direction, one of the battery modules is suitable for being located between the two longitudinal beams, and the other two battery modules are suitable for being located on the sides of the two longitudinal beams away from each other, and a first avoidance groove for avoiding the longitudinal beam is defined between two adjacent battery modules; The battery module located between the two longitudinal beams is a first battery module, the vehicle beam includes a cross beam connected between the two longitudinal beams, and a second avoidance groove for avoiding the cross beam is formed on the first battery module.

15. A vehicle, characterized in that: include: A vehicle body, including the vehicle beam; A battery pack according to any one of claims 1 to 14.

Images