Edge beam assembly of battery pack box body, battery pack box body, battery pack and electric equipment

Abstract

The invention discloses a boundary beam assembly of a battery pack box body, the battery pack box body, a battery pack and electric equipment. The boundary beam assembly of the battery pack box body comprises a first beam, a second beam and a third beam, the first beam defines at least one cavity, the second beam defines at least one cavity, the first beam is connected to the second beam, in the first direction, at least part of the first beam and at least part of the second beam overlap to define a multi-layer structure, the boundary beam assembly comprises a first multi-layer structure and a second multi-layer structure, and the number of layers of the first multi-layer structure and the number of layers of the second multi-layer structure are different. According to the boundary beam assembly provided by the embodiment of the invention, the multi-layer wall thickness with more layers is designed in the area, with large stress, of the battery pack box body, and the multi-layer structure with less layers is designed in the area, with small stress, of the battery pack box body, so that the rigidity of the area is ensured while the weight is reduced; the rigidity of the battery pack box body is increased according to the actual load condition of the battery pack box body, and the reinforcing effect on the battery pack box body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a side beam assembly of a battery pack box, a battery pack box, a battery pack and an electrical device. Background Art

[0002] In the related art, a supporting side beam is fixed on the battery pack, and the battery pack is fixed by fixing the supporting side beam. However, in the prior art, during actual use, due to the different stress distribution in different areas of the battery pack, the supporting side beam has a poor effect of reinforcing the battery pack structure. 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, the present invention proposes a side beam assembly of a battery pack case, which makes the area with greater stress located at the multi-layer structure according to the distribution of stress on the side beam assembly, so that the side beam assembly can bear the load according to the actual situation, so as to design a multi-layer wall thickness with more layers in the area with greater stress of the battery pack case, increase the stiffness of the area, and disperse the stress of the battery pack case, and design a multi-layer structure with fewer layers in the area with less stress of the battery pack case, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case according to the actual load condition of the battery pack case and improve the strengthening effect of the battery pack case.

[0004] The present invention also provides a battery pack box having the side beam assembly.

[0005] The present invention also provides a battery pack having the battery pack case.

[0006] The present invention also provides an electrical device having the battery pack.

[0007] According to an embodiment of the first aspect of the present invention, a side beam assembly of a battery pack body includes: a first beam; a second beam, wherein the second beam defines at least one cavity, the first beam is connected to the second beam, and in a first direction, at least a portion of the first beam and at least a portion of the second beam overlap to define a multi-layer structure, wherein the side beam assembly includes a first multi-layer structure and a second multi-layer structure, and the first multi-layer structure and the second multi-layer structure have different numbers of layers.

[0008] The side beam assembly of the battery pack case according to the embodiment of the present invention makes the area with greater stress located in the multi-layer structure according to the distribution of stress on the side beam assembly, so that the side beam assembly can bear the load according to the actual situation, so as to design a multi-layer wall thickness with more layers in the area of ​​the battery pack case with greater stress, increase the stiffness of the area, and disperse the stress of the battery pack case, and design a multi-layer structure with fewer layers in the area of ​​the battery pack case with less stress, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case according to the actual load conditions of the battery pack case and improve the reinforcement effect of the battery pack case.

[0009] In addition, the side beam assembly of the battery pack box according to the above embodiment of the present invention may also have the following additional technical features:

[0010] According to some optional embodiments of the present invention, the number of layers of the second multi-layer structure is greater than the number of layers of the first multi-layer structure.

[0011] According to some specific embodiments of the present invention, the first multi-layer structure is at least a two-layer structure; and / or the second multi-layer structure is at least a three-layer structure.

[0012] According to some specific embodiments of the present invention, the first multi-layer structure is a two-layer structure and is defined by the overlapping of a single-layer first beam and a single-layer second beam; and / or the second multi-layer structure is defined by the multi-layer overlapping portion of the second beam and the single-layer portion of the first beam.

[0013] According to some embodiments of the present invention, the first beam is an integral roll-formed structure; and / or, the second beam is an integral roll-formed structure.

[0014] According to some embodiments of the present invention, the second beam is bent to define a plurality of the cavities.

[0015] According to some optional embodiments of the present invention, in the first direction, at least two of the cavities are arranged adjacent to each other; and / or in a second direction, at least two of the cavities are arranged adjacent to each other, and the second direction is perpendicular to the first direction.

[0016] According to some optional embodiments of the present invention, in the second direction, at least one cavity is located at one side of the multilayer structure; and / or in the first direction, at least one cavity is located at one side of the multilayer structure.

[0017] According to some specific embodiments of the present invention, the plurality of cavities include a first cavity and a second cavity, and the first cavity and the second cavity are adjacently arranged in the first direction.

[0018] In some embodiments, the plurality of cavities further include a third cavity, and in the second direction, the third cavity is located on one side of the first cavity and the second cavity.

[0019] According to some specific embodiments of the present invention, the plurality of cavities further include a fourth cavity, and in the second direction, the fourth cavity is located at one side of the second multilayer structure.

[0020] According to some embodiments of the present invention, at least a portion of the first beam and at least a portion of the second beam are spaced apart to define a first buffer cavity.

[0021] According to some embodiments of the present invention, in the first direction, the first beam includes a first part, a connecting part and a second part, the first part and the second part are arranged at intervals in their projections on a plane perpendicular to the first direction, and both ends of the connecting part are respectively connected to the first part and the second part.

[0022] According to some optional embodiments of the present invention, the second beam cooperates with the first part and the second part to define the multi-layer structure.

[0023] According to some specific embodiments of the present invention, at least a portion of the second beam is spaced apart from the connecting portion to define a first buffer cavity.

[0024] According to some specific embodiments of the present invention, at least one cavity is defined between at least one of the first part and the second part and the second beam.

[0025] In some embodiments, at least a portion of the second beam is recessed in a direction away from the first portion to define a fifth cavity between the second beam and the first portion; and / or at least a portion of the second portion is recessed in a direction away from the second beam to define a sixth cavity between the second beam and the second beam.

[0026] According to a second aspect of the present invention, a battery pack case is provided, the battery pack case comprising: a tray; and a side beam assembly according to the first aspect of the present invention, the side beam assembly being connected to the tray.

[0027] According to the battery pack case of the embodiment of the present invention, by utilizing the side beam assembly of the battery pack case described in the embodiment of the first aspect of the present invention, according to the distribution of stress on the side beam assembly, the area with greater stress is located in the multi-layer structure, so that the side beam assembly carries the load according to the actual situation, so that a multi-layer wall thickness with a larger number of layers is designed in the area of ​​the battery pack case with greater stress, the stiffness of the area is increased, and the stress of the battery pack case is dispersed, and a multi-layer structure with a smaller number of layers is designed in the area of ​​the battery pack case with less stress, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case according to the actual load conditions of the battery pack case and improve the reinforcement effect of the battery pack case.

[0028] According to some embodiments of the present invention, the first beam is located between the second beam and the pallet, and the first beam is connected to the pallet.

[0029] According to some optional embodiments of the present invention, the pallet includes a main body portion defining a accommodating cavity and a fixing portion connected to the main body portion at an edge of an opening of the accommodating cavity; the side beam assembly is fixedly connected to the main body portion and the fixing portion, respectively.

[0030] According to some specific embodiments of the present invention, the pallet is a steel pallet; and / or the pallet is an integral stamping structure.

[0031] According to some specific embodiments of the present invention, the main body portion and / or the fixing portion is connected to at least a portion of the multi-layer structure of the side beam assembly.

[0032] In some embodiments, the main body portion is connected to at least a portion of the multi-layer structure of the side beam assembly by welding or bonding; and / or the fixing portion is connected to at least a portion of the multi-layer structure of the side beam assembly by welding or bonding.

[0033] According to some embodiments of the present invention, a portion of the side beam assembly is spaced apart from the tray to define a second buffer cavity.

[0034] According to a third aspect of the present invention, a battery pack is provided, comprising: a battery pack case according to the embodiment of the second aspect of the present invention; and a battery cell, wherein the battery cell is placed in the tray.

[0035] According to the battery pack of the embodiment of the present invention, by utilizing the battery pack case described in the embodiment of the second aspect of the present invention, according to the distribution of stress on the side beam assembly, the area with greater stress is located in the multi-layer structure, so that the side beam assembly bears the load according to the actual situation, so that a multi-layer wall thickness with a larger number of layers is designed in the area where the battery pack case is subjected to greater stress, the stiffness of the area is increased, and the stress of the battery pack case is dispersed, and a multi-layer structure with a smaller number of layers is designed in the area where the battery pack case is subjected to less stress, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case according to the actual load conditions of the battery pack case and improve the reinforcement effect of the battery pack case.

[0036] According to some embodiments of the present invention, a plurality of battery cells are arranged along a third direction of the side beam assembly in the box body; the tray includes a main body portion defining a accommodating cavity, and a plurality of the battery cells are placed in the accommodating cavity; a length of a portion of the side beam assembly overlapping the main body portion in the second direction is L1, and the first direction, the second direction and the third direction are perpendicular to each other; a thickness of a shell of each of the battery cells is L2; ​​and the battery pack satisfies: L1 / L2≥3.

[0037] According to a fourth aspect of the present invention, an electric device is provided. The electric device includes the battery pack according to the embodiment of the third aspect of the present invention.

[0038] According to the electrical equipment of the embodiment of the present invention, by utilizing the battery pack described in the embodiment of the third aspect of the present invention, based on the distribution of stress on the side beam assembly, the area with greater stress is located in the multi-layer structure, so that the side beam assembly bears the load according to the actual situation, so that a multi-layer wall thickness with a larger number of layers is designed in the area where the battery pack case is subjected to greater stress, the stiffness of the area is increased, and the stress of the battery pack case is dispersed, and a multi-layer structure with a smaller number of layers is designed in the area where the battery pack case is subjected to less stress, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case according to the actual load conditions of the battery pack case and improve the reinforcement effect of the battery pack case.

[0039] 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

[0040] 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:

[0041] Figure 1 is a schematic structural diagram of a side beam assembly of a battery pack box according to an embodiment of the present invention;

[0042] Figure 2is a side view of a side beam assembly of a battery pack box according to an embodiment of the present invention;

[0043] Figure 3 is a schematic structural diagram of a first beam according to an embodiment of the present invention;

[0044] Figure 4 is a schematic structural diagram of a second beam according to an embodiment of the present invention;

[0045] Figure 5 is a side view of a second beam according to an embodiment of the present invention;

[0046] Figure 6 is a schematic structural diagram of a side beam assembly and a pallet according to an embodiment of the present invention;

[0047] Figure 7 is a bottom view of a side beam assembly and a pallet according to an embodiment of the present invention;

[0048] Figure 8 is a cross-sectional view of a side beam assembly and a tray according to an embodiment of the present invention;

[0049] Fig. 9 yes Figure 8 A magnified view of the middle area;

[0050] Fig.10 is a schematic structural diagram of a battery pack case according to an embodiment of the present invention.

[0051] Reference numerals: 1000, battery pack box;

[0052] 1. Side beam assembly;

[0053] 10. first beam; 11. first part; 12. second part; 13. connecting part;

[0054] 20, second beam; 211, first cavity; 212, second cavity; 213, third cavity; 214, fourth cavity; 215, fifth cavity; 216, sixth cavity;

[0055] 31. a first multilayer structure; 32. a second multilayer structure;

[0056] 41. A first buffer chamber;

[0057] 6. tray; 61. main body; 611. accommodating cavity; 62. fixing part; 63. reinforcing convex part;

[0058] 71. Second buffer chamber;

[0059] 81. Expansion beam; 82. Reinforcement plate. DETAILED DESCRIPTION

[0060] Embodiments of the present invention are described in detail below, examples of which 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.

[0061] The side beam assembly 1 of the battery pack body 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0062] like Figure 1-Figure 10 As shown, the side beam assembly 1 of the battery pack body 1000 according to an embodiment of the present invention includes a first beam 10 and a second beam 20 .

[0063] The second beam 2 defines at least one cavity, the first beam 10 is connected to the second beam 20, and in a first direction, at least a portion of the first beam 10 and at least a portion of the second beam 20 overlap to define a multi-layer structure, thereby making the overall structural strength of the side beam assembly 1 stronger, so that the side beam assembly 1 can be used to carry the battery pack body 1000 with a larger mass, thereby stably fixing the battery pack body 1000 at a designated position.

[0064] At least part of the first beam 10 and at least part of the second beam 20 are overlapped to define a multi-layer structure, so that according to the stress distribution on the side beam assembly 1, the area with greater stress is located in the multi-layer structure, so that the side beam assembly 1 can bear the load according to the actual situation, thereby improving the bearing capacity of the side beam assembly 1.

[0065] In addition, making the second beam 20 define at least one cavity can, on the one hand, increase the overall strength of the second beam 20, and thus increase the overall strength of the side beam assembly 1, so that when the battery pack body 1000 vibrates, it can reduce the vibration response stress, and thus reduce the vibration force transmitted to the battery cells in the battery pack; when the battery pack body 1000 is squeezed, the side beam assembly 1 can absorb energy to reduce the transmission of the squeezing force and protect the battery cells in the battery pack body 1000.

[0066] At the same time, the battery cells in the battery pack will expand during the charging and discharging process, so that the second beam 20 defines at least one cavity, so as to leave space for the deformation of the first beam 10 and the second beam 20 when the side beam assembly 1 is subjected to a compression force.

[0067] Specifically, the side beam assembly 1 includes a first multilayer structure 31 and a second multilayer structure 32. The first multilayer structure 31 and the second multilayer structure 32 have different numbers of layers, so that the side beam assembly 1 can withstand a larger load force according to needs, and thus the side beam assembly 1 can stably support the battery pack at a specified position.

[0068] Specifically, when the battery pack is supported at a specified position by using the side beam assembly 1, the stress distribution in different areas of the side beam assembly 1 is different. In the area with larger stress distribution, a structure with more layers can be set, and in the area with smaller stress distribution, a single-layer structure can be set with fewer layers. This allows the side beam assembly 1 to be able to carry a larger load according to actual conditions, thereby improving the load-bearing capacity of the side beam assembly 1, improving the structural strength of the side beam assembly 1, improving the anti-extrusion ability of the side beam assembly, etc., which is convenient for protecting the battery cells in the battery pack and improving the service life of the battery pack.

[0069] Specifically, a multi-layer wall thickness with more layers, such as the first multi-layer structure 31 or the second multi-layer structure 32, is designed in the area of ​​the battery pack case 1000 where the force is large, so as to increase the rigidity of the area and disperse the force of the battery pack case 1000, thereby reducing the stress on the battery pack case 1000 and the battery cells and other components in the battery pack, and improving the anti-lateral squeeze capability of the battery pack case 1000. In the area of ​​the battery pack case 1000 where the force is small, a multi-layer structure with fewer layers is designed, so that the rigidity of the battery pack case 1000 in the area can be improved while reducing the weight.

[0070] Therefore, according to the embodiment of the present invention, the side beam assembly 1 of the battery pack case 1000 makes the area with greater stress located in the multi-layer structure according to the distribution of stress on the side beam assembly 1, so that the side beam assembly 1 can bear the load according to the actual situation, so as to design a multi-layer wall thickness with more layers in the area of ​​the battery pack case 1000 with greater stress, increase the stiffness of the area, and disperse the stress of the battery pack case 1000, and design a multi-layer structure with fewer layers in the area of ​​the battery pack case 1000 with less stress, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case 1000 according to the actual load condition of the battery pack case 1000 and improve the reinforcement effect of the battery pack case 1000.

[0071] The following describes the side beam assembly 1 of the battery pack body 1000 according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0072] In some specific embodiments of the present invention, Figure 1-Figure 10 As shown, the side beam assembly 1 of the battery pack body 1000 includes a first beam 10 and a second beam 20 .

[0073] In some embodiments of the present invention, the battery pack case 1000 refers to a tray of the battery pack, and the side beam assembly 1 is connected to the tray of the battery pack.

[0074] In other embodiments of the present invention, the battery pack case 1000 refers to the shell, bottom plate or frame of the battery pack, and the side beam assembly 1 is connected to the shell, bottom plate or frame of the battery pack case 1000 .

[0075] In some optional embodiments of the present invention, Figure 2 As shown, the number of layers of the second multilayer structure 32 is greater than the number of layers of the first multilayer structure 31 .

[0076] In some optional embodiments of the present invention, the first multi-layer structure 31 is a structure of at least two layers. Specifically, the first multi-layer structure 31 may be two layers, three layers, four layers or more layers, which is not limited here.

[0077] The side beam assembly 1 may include a single or multiple first multilayer structures 31 , and no further limitation is given here.

[0078] In some specific embodiments of the present invention, the first multilayer structure 31 is a two-layer structure and is defined by overlapping a single-layer first beam 10 and a single-layer second beam 20, so that the first multilayer structure 31 has sufficient thickness to enable the first multilayer structure 31 to bear the corresponding load force.

[0079] In some optional embodiments of the present invention, the second multi-layer structure 32 is at least a three-layer structure. Specifically, the second multi-layer structure 32 may be three-layer, four-layer, five-layer or more-layer, which is not limited here.

[0080] The side beam assembly 1 may include a single or multiple second multilayer structures 32 , and no further limitation is given here.

[0081] In some specific embodiments of the present invention, the second multi-layer structure 32 is defined by the overlapping multi-layer portions of the second beam 20 and the overlapping single-layer portions of the first beam 10, so that the thickness of the second multi-layer structure 32 is larger, thereby making the structural strength of the second multi-layer structure 32 stronger and capable of bearing a larger load force.

[0082] In some embodiments, Figure 2 As shown, the first multilayer structure 31 is a two-layer structure, and the first multilayer structure 31 is defined by the single-layer portion of the first beam 10 and the single-layer portion of the second beam 20. The second multilayer structure 32 is a three-layer structure, and the second multilayer structure 32 is defined by the single-layer portion of the first beam 10 and the two-layer portion of the second beam 20.

[0083] Of course, according to actual load requirements, the second multi-layer structure 32 may also be a five-layer, six-layer or seven-layer structure, and the first multi-layer structure 31 may be a three-layer, four-layer or five-layer structure, and no excessive restrictions are made here.

[0084] In some embodiments of the present invention, the first beam 10 is an integrated roll-formed structure. Specifically, the first beam 10 is formed of a rolled sheet. This makes it easy to control the length and width of the first beam 10 as needed, thereby reducing the difficulty of processing the first beam 10.

[0085] In some embodiments, the first beam 10 is formed by rolling steel with a thickness ranging from 0.8 mm to 1.5 mm. The material is preferably DP780 and the thickness is preferably 1.2 mm.

[0086] In some embodiments of the present invention, the second beam 20 is an integrated roll-formed structure. Specifically, the second beam 20 is formed by bending a rolled sheet. This makes it easy to control the length and width of the second beam 20 as needed, thereby reducing the difficulty of processing the second beam 20.

[0087] In some embodiments, by bending the rolled sheet multiple times, a two-layer, three-layer or even more-layer structure can be formed on the second beam 20 to meet actual needs. This can reduce the weight while ensuring the stiffness of the multi-layer structure, thereby increasing the stiffness of the battery pack case and improving the reinforcement effect of the battery pack case.

[0088] In addition, the second beam 20 is an integrated piece and is formed by bending, which is convenient for processing and manufacturing and improves production efficiency.

[0089] In some examples, the second beam 20 is formed by rolling steel with a thickness ranging from 0.8 mm to 1.5 mm. The material is preferably DP780 and the thickness is preferably 1.2 mm.

[0090] In some embodiments of the present invention, Figure 2 , Figure 5 As shown, the second beam 20 is bent to define a plurality of cavities. The provision of the plurality of cavities is convenient for increasing the overall strength of the second beam 20, thereby increasing the overall strength of the side beam assembly 1, so that when the battery pack case 1000 vibrates, the vibration response stress can be reduced, thereby reducing the vibration force transmitted to the battery cells in the battery pack case 1000; when the battery pack case 1000 is squeezed, the cavity can be deformed to absorb energy, so as to reduce the transmission of the squeezing force and protect the battery cells in the battery pack case 1000.

[0091] At the same time, the battery cells in the battery pack will expand during the charge and discharge process, so that the second beam 20 defines at least one cavity, so as to leave space for the deformation of the second beam 20 when the side beam assembly 1 is subjected to a compression force.

[0092] In some embodiments, the second beam 20 is formed by bending a rolled sheet. By bending the rolled sheet, multiple cavities can be formed on the rolled sheet to meet design requirements. This method is relatively simple and convenient for reducing processing difficulty and cost.

[0093] In some optional embodiments of the present invention, Figure 2 As shown, in the first direction, at least two cavities are disposed adjacent to each other to increase the structural strength of the second beam 20 .

[0094] In some optional embodiments of the present invention, Figure 2 As shown, in the second direction, at least two cavities are arranged adjacent to each other to reserve sufficient space for the expansion of the battery cells in the battery pack to avoid affecting the charging and discharging of the battery cells.

[0095] In some optional embodiments of the present invention, in the second direction, at least one cavity is located on one side of the multilayer structure, so as to utilize the arrangement of the cavity and the multilayer structure to jointly increase the structural strength of the side beam assembly 1, so that the multilayer structure can bear a larger load force.

[0096] In some optional embodiments of the present invention, in the first direction, at least one cavity is located on one side of the multi-layer structure, so as to utilize the arrangement of the cavity and the multi-layer structure to jointly increase the structural strength of the side beam assembly 1, so that the multi-layer structure can bear a larger load force.

[0097] In some specific embodiments of the present invention, the multi-layer structure is suitable for being fixedly connected to the tray 6 of the box body, so as to utilize the stronger part to directly support the tray 6 of the box body, thereby reducing the possibility of the side beam assembly 1 collapsing or breaking due to excessive force, and the battery pack can be fixed at a designated position by utilizing the side beam assembly 1.

[0098] In the second direction, at least one cavity is located on one side of the multi-layer structure, so that the arrangement of the cavity and the multi-layer structure can jointly increase the structural strength of the side beam assembly 1, so that the multi-layer structure can bear a larger load force.

[0099] In the first direction, at least one cavity is located on the side of the multilayer structure away from the tray 6, so that the arrangement of the cavity and the multilayer structure can jointly increase the structural strength of the side beam assembly 1, so that the multilayer structure can bear a larger load force.

[0100] In some optional embodiments of the present invention, Figure 2 As shown, the multiple cavities include a first cavity 211 and a second cavity 212 , and the first cavity 211 and the second cavity 212 are adjacently arranged in a first direction to reasonably arrange the positions of the multiple cavities in a limited space, thereby fully increasing the structural strength of the second beam 20 .

[0101] In some specific embodiments of the present invention, the multiple cavities also include a third cavity 213. In the second direction, the third cavity 213 is located on one side of the first cavity 211 and the second cavity 212, so as to reasonably arrange the positions of the multiple cavities in a limited space, thereby fully increasing the structural strength of the second beam 20.

[0102] In some optional embodiments of the present invention, the plurality of cavities further include a fourth cavity 214. In the second direction, the fourth cavity 214 is located on one side of the second multilayer structure 32, so that the second multilayer structure 32 is used to separate the fourth cavity 214 and other cavities, thereby reasonably arranging the positions of the plurality of cavities in a limited space, thereby fully increasing the structural strength of the second beam 20.

[0103] In some embodiments, the fourth cavity 214 is located on a side of the third cavity 213 away from the first cavity 211 , so as to reasonably arrange the positions of multiple cavities in a limited space, thereby fully increasing the structural strength of the second beam 20 .

[0104] In some embodiments, a multi-layer structure is provided between the third cavity 213 and the fourth cavity 214 to separate the third cavity 213 and the fourth cavity 214 using the multi-layer structure, further increasing the strength of the third cavity 213 and the fourth cavity 214 , thereby increasing the strength of the second beam 20 .

[0105] In some examples, such as Figure 2 As shown, a three-layer structure is provided between the third cavity 213 and the fourth cavity 214 .

[0106] In some specific embodiments of the present invention, at least one of the third cavity 213 and the first cavity 211 is located on the side of the multi-layer structure away from the tray 6, so that the multi-layer structure is arranged between the tray 6 and at least one of the third cavity 213 and the first cavity 211, so that the multi-layer structure first bears the corresponding load, and the cavity is used to support the multi-layer structure, thereby facilitating reducing the possibility of deformation of the second beam 20 under the load force.

[0107] In some embodiments of the present invention, at least two cavities have different shapes, which facilitates full use of space on the one hand, and facilitates improving the overall structural strength of the second beam 20 on the other hand.

[0108] Specifically, in some embodiments, the first cavity 211 and the fourth cavity 214 are cavities similar to trapezoids, and the second cavity 212 is a cavity similar to a triangle.

[0109] In some embodiments, Figure 5 As shown, the second beam 20 is bent and includes multiple sections. The second beam 20 includes a2 section, b2 section, c2 section, d2 section, e2 section, f2 section, g2 section, h2 section, i2 section, j2 section, k2 section, m2 section, n2 section, o2 section and p2 section which are connected in sequence. That is, a2 section is the starting section and p2 is the ending section.

[0110] The extension directions of two adjacent sections are different, that is, the rolled sheet is bent at different angles and directions to form multiple sections, and then multiple cavities are defined by the multiple sections. The multiple sections are overlapped in the first direction to form a two-layer or three-layer structure, thereby increasing the thickness of the second beam 20 at this position and increasing the load that the second beam 20 can withstand at this position.

[0111] Among them, segment a2 extends along the second direction, and segment b2 forms an angle with segment a2, and the angle range can be 90°-110°, such as 90°, 100° or 110°, so as to ensure structural strength and stability while facilitating the process.

[0112] In some examples, segment b2 is transitionally connected to segment a2 by a rounded corner R3.

[0113] The c2 segment extends along the second direction, the c2 segment is transitionally connected with the b2 segment by the rounded corner R2, and the d2 segment forms an angle with the c2 segment. The angle range is 155°-165°, for example, the angle is 155°, 160° or 165°. The e2 segment extends along the first direction, the e2 segment is transitionally connected with the d2 segment by the rounded corner R2. The second direction of the f2 segment generally extends along the second direction, and the f2 segment is transitionally connected with the e2 segment by the rounded corner.

[0114] Among them, at least part of segment f2 overlaps with at least part of segment a2 in the first direction, so that segments f2, a2, b2, c2, d2, and e2 together form a first cavity 211 with complete side walls, thereby improving the stability of the second beam 20.

[0115] In some examples, the first cavity 211 is a trapezoidal cavity.

[0116] The g2 segment transitions to the f2 segment with a rounded corner R3-R3.5, and the size of the g2 segment in the first direction is 85%-90% of the size of the second beam 20 in the first direction. The h2 segment extends along the second direction, and the h2 segment transitions to the g2 rounded corner R2. The i2 segment extends along the first direction, and the height of the i2 segment is 10%-15% of the size of the second beam 20 in the first direction. The i2 segment transitions to the h2 segment with a rounded corner R2, and the lowest point of the i2 segment cannot be lower than the set ground clearance margin requirement. The j2 segment extends along the second direction, and the j2 segment transitions to the i2 segment with a rounded corner R2, and the size of the j2 segment in the second direction is 60%-65% of the size of the h2 segment in the second direction. The angle between the k2 segment and the j2 segment is 120-130°, preferably 125°, and the k2 segment transitions to the j2 rounded corner R2. The m2 segment extends along the second direction, and the m2 segment transitions to the k2 segment with a rounded corner R2.

[0117] Among them, the highest point of segment k2 in the first direction is level with the lowest point of segment h2, ensuring that segment m2 and part of segment h2 are fitted together, and segment h2, segment i2, segment j2, and segment k2 together form a trapezoidal cavity to form a stable structure.

[0118] Among them, the highest point of segment k2 in the first direction is flush with the lowest point of segment h2, and the extension distance of segment k2 in the second direction does not exceed the end of segment h2 in the second direction, so as to ensure that segment m2 and part of segment h2 are fitted together, thereby defining a fourth cavity 214 with bent side walls between segment h2, segment i2, segment j2 and segment k2, thereby improving the stability of the second beam 20.

[0119] The included angle between segment n2 and segment m2 is 130°-150°, preferably 140°. Segment O2 extends along the first direction.

[0120] Among them, the highest point of segment n2 in the first direction is level with the lowest point of segment c2 to ensure that segment o2 and part of segment c2 fit together, thereby making segment b2, segment a2, segment g2, part of segment m2, segment n2 and part of segment o2 define a third cavity 213.

[0121] The p2 segment extends along the first direction, and the p2 segment is transitionally connected to the o2 segment with a rounded corner R2.

[0122] Among them, the extended end of segment o2 in the second direction is flush with segment e2 to ensure that segment p2 and segment e2 can fit together. Specifically, the cutoff point of segment p2 in the first direction is located at the midpoint of segment e2. The fitting section of segment p2 and segment e2 can meet the welding section requirements. Segment d2, segment o2, segment p2 and a part of segment e2 jointly define a second cavity 212. The second cavity 212 is a triangular cavity to form a stable structure.

[0123] In some examples, the size of segment e2 along the first direction accounts for 15%-20% of the size of the second beam 20 in the first direction, so that the size of segment e2 in the first direction meets the welding requirement, and then segment p2 and segment e2 are welded together.

[0124] In some examples, the highest point of segment e2 in the first direction is flush with segment a2.

[0125] In some examples, such as Figure 5 , Fig. 9 As shown, at least parts of segment a2 and segment f2 overlap in the first direction and are fixed by welding, wherein the length of segment a2 in the second direction is 4mm-6mm, so as to have sufficient length to weld segment a2 and segment f2 together.

[0126] At least part of the m2 segment and the h2 segment overlap in the first direction and are fixed by welding. At least part of the c2 segment and the o2 segment overlap in the first direction and are fixed by welding. At least part of the p2 segment and the e2 segment overlap in the second direction and are fixed by welding to form a stable structure and define a plurality of stable cavities.

[0127] In some examples, segment f2 includes segment f21, segment f22, segment f22 and segment f23 connected in sequence, the second directions of segments f21 and f23 both extend along the second direction, and segment f22 protrudes in a direction away from the first beam 10 to enhance the overall structural strength of segment f2.

[0128] The f21 segment extends along the second direction, and the rounded corner R2 transitions between f21 and e2. The length of f21 in the second direction is related to the fixed position of the battery pack. The f22 segment is designed with downward convex ribs, which is conducive to improving rigidity and increasing structural stability. The convex depth of the f22 segment is 3mm. The f22 segment transitions with the f21 segment and the f23 segment and the rounded corner, with an angle of R2-R2.5, and the length accounts for 10%-15% of f2.

[0129] The end of the m2 segment in the second direction corresponds to the junction of the g2 end and the f23 segment.

[0130] The f23 segment is completely located under the pressing surface of the tray 6. The width of the f23 segment is provided with holes along the third direction, and bolts or rivets are used to fasten the components to the tray 6. The contact portion between the f23 segment and the a2 segment can be used for welding.

[0131] Among them, the second beam 20 has a mounting hole that penetrates the f21 segment, the d2 segment and the o2 segment along the first direction, and a sleeve is provided at the mounting hole to use the sleeve to fix the side beam assembly 1 at the specified position, and then fix the battery pack at the specified position.

[0132] Segment c2 and f21 are staggered in the first direction to prevent the installation hole from penetrating into segment c2. The length of segment d2 at both ends in the second direction is greater than or equal to the length of segment f21 in the second direction to reserve sufficient length for the installation hole in segment d2.

[0133] In some embodiments, the sleeve is welded by argon arc welding and roller beam, and the sleeve is used to install the battery pack. The number and position of the sleeve, the size of the battery pack and other factors determine it.

[0134] In some examples, the first direction is the height direction of the battery pack case 1000 , and the second direction is the width direction of the tray 6 .

[0135] In some embodiments of the present invention, at least a portion of the first beam 10 and at least a portion of the second beam 20 are spaced apart to define a first buffer cavity 41. When the side beam assembly 1 is impacted, space can be reserved for the deformation of the first beam 10 and the second beam 20, thereby reducing the force transmitted to the tray 6 or the battery pack box, thereby protecting the battery cells in the box.

[0136] In some embodiments of the present invention, Figure 2As shown, in the first direction, the first beam 10 includes a first portion 11, a connecting portion 13 and a second portion 12. The first portion 11 and the second portion 12 are arranged at a projection interval on a plane perpendicular to the first direction, and both ends of the connecting portion 13 are respectively connected to the first portion 11 and the second portion 12, so that the first beam 10 is a bent structure, thereby facilitating the enhancement of the structural strength of the first beam 10.

[0137] In some embodiments, Figure 2 As shown, the first portion 11 extends along the second direction, the connecting portion 13 is transitionally connected to the first portion 11 at a rounded corner R3, the second portion 12 extends along the second direction, and the second portion 12 is transitionally connected to the connecting portion 13 at a rounded corner R2, so as to form a bent structure while simplifying the processing technology, thereby enhancing the structural strength of the first beam 10.

[0138] In some optional embodiments of the present invention, the second beam 20 cooperates with the first part 11 and the second part 12 to define a multi-layer structure of at least three layers, so that the overall structural strength of the side beam assembly 1 is stronger, so that the side beam assembly 1 can be used to carry the battery pack body 1000 with a larger mass, and then the battery pack body 1000 can be stably fixed at a designated position.

[0139] like Figure 2 , Figure 5 As shown, in this embodiment, at least a portion of the f2 segment and at least a portion of the first portion 11 overlap in the first direction, thereby forming a two-layer structure.

[0140] At least part of the m2 segment and the h2 segment overlaps with at least part of the second portion 12 in the first direction, thereby forming a three-layer structure.

[0141] In some optional embodiments of the present invention, at least a portion of the second beam 20 is spaced apart from the connecting portion 13 to define a first buffer cavity 41, so that the first buffer cavity 41 can be used to resist the extrusion force and absorb energy, thereby reserving space for the deformation of the second beam 20, thereby reducing the force of the transfer tray 6 or the battery pack box and protecting the battery cells in the box.

[0142] In some embodiments, Figure 2 As shown, the g2 segment is parallel to the connecting portion 13 of the first beam 10 , and there is a gap between the g2 segment and the connecting portion 13 of the first beam 10 to define a first buffer cavity 41 .

[0143] In some embodiments, Figure 5 , Fig. 9As shown, the first portion 11 overlaps with at least a portion of the f2 segment in the first direction and is fixed by welding, and at least a portion of the h2 segment overlaps with at least a portion of the second portion 12 in the first direction and is fixed by welding, so that a stable side beam assembly 1 is formed between the first beam 10 and the second beam 20, and a stable first buffer cavity 41 is defined between the first beam 10 and the second beam 20.

[0144] In addition, the first portion 11 and the segment f2 define a first multilayer structure 31 , and the second portion 12 and the segments h2 and m2 define a second multilayer structure 32 .

[0145] In some examples, the length of the segment f2 in the second direction depends on the position of the sleeve and the size of the first portion 11 of the first beam 10 in the second direction.

[0146] In some examples, a dimension of the h2 segment along the second direction is smaller than a dimension of the second portion 12 of the first beam 10 along the second direction.

[0147] In some optional embodiments of the present invention, at least one cavity is defined between at least one of the first part 11 and the second part 12 and the second beam 20 to enhance the overall structural strength of the side beam assembly 1 and reserve space for deformation of the first beam 10 and the second beam 20 .

[0148] In some specific embodiments of the present invention, Figure 2 As shown, at least a portion of the second beam 20 is recessed in a direction away from the first portion 11 to define a fifth cavity 215 between the first portion 11 , thereby enhancing the overall structural strength of the beam assembly 1 and reserving space for deformation of the first portion 11 and the second beam 20 .

[0149] In some embodiments, at least a portion of the first portion 11 overlaps with at least a portion of the f2 segment of the second beam 20 in the first direction, and a portion of the f2 segment of the second beam 20 is recessed in a direction away from the first portion 11 so that a fifth cavity 215 is defined between the f2 segment and the first portion 11.

[0150] In some specific embodiments of the present invention, at least a portion of the second portion 12 is recessed in a direction away from the second beam 20 to define a sixth cavity 216 between the second beam 20 , thereby enhancing the overall structural strength of the beam assembly 1 and reserving space for deformation of the second portion 12 and the second beam 20 .

[0151] In some embodiments, at least part of the second portion 12 overlaps at least part of the h2 segment of the second beam in the first direction, and the second portion 12 protrudes away from the h2 segment to define a sixth cavity 216 between the second portion 12 and the h2 segment.

[0152] The battery pack case 1000 according to an embodiment of the present invention is described below. The battery pack case 1000 according to an embodiment of the present invention comprises a tray 6 and a side beam assembly 1 according to the above embodiment of the present invention.

[0153] The side beam assembly 1 is connected to the pallet 6 to bear the weight of the pallet 6 , and the pallet 6 is then fixed at a designated position through the side beam assembly 1 .

[0154] According to the battery pack case 1000 of the embodiment of the present invention, by utilizing the side beam assembly 1 according to the above-mentioned embodiment of the present invention, according to the distribution of stress on the side beam assembly 1, the area with greater stress is located in the multi-layer structure, so that the side beam assembly 1 can bear the load according to the actual situation, so that the multi-layer wall thickness with more layers is designed in the area of ​​the battery pack case 1000 with greater stress, the stiffness of the area is increased, and the stress of the battery pack case 1000 is dispersed, and the multi-layer structure with fewer layers is designed in the area of ​​the battery pack case 1000 with less stress, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case 1000 according to the actual load condition of the battery pack case 1000 and improve the reinforcement effect of the battery pack case 1000.

[0155] According to some embodiments of the present invention, Figure 8 , Fig. 9 As shown, the first beam 10 is located between the second beam 20 and the pallet 6, and the first beam 10 is connected to the pallet 6 so that the first beam 10 directly contacts and cooperates with the pallet 6, thereby enabling the first beam 10 to share the force on the pallet 6, so as to utilize the side beam assembly 1 to stably fix the pallet 6 at the specified position.

[0156] According to some optional embodiments of the present invention, the pallet 6 includes a main body portion 61 and a fixing portion 62, the main body portion 61 defines a accommodating cavity 611, the fixing portion 62 is connected to the edge of the opening of the accommodating cavity 611, and the side beam assembly 1 is respectively connected to the main body portion 61 and / or the fixing portion 62 to increase the matching area between the side beam assembly 1 and the pallet 6 and improve the stability of the matching between the side beam assembly 1 and the pallet 6.

[0157] In some embodiments, the tray 6 is a steel tray so that the tray 6 has sufficient strength to withstand the force of the battery cells.

[0158] In some embodiments, the tray 6 is an integrated stamping structure, so that the structure of the tray 6 is simple, the manufacturing difficulty is low, and the processing cost is reduced.

[0159] In some examples, the fixing portion 62 is a flange structure of the tray 6 , and a boat-shaped structure can be formed by stamping the rolled sheet, thereby forming the main body 61 and the fixing portion 62 .

[0160] According to some specific embodiments of the present invention, the main body portion 61 and / or the fixing portion 62 are connected to at least a portion of the multi-layer structure of the side beam assembly 1, so as to utilize the multi-layer structure to directly bear the gravity of the tray 6, thereby increasing the possibility of the side beam assembly 1 collapsing or breaking due to excessive force, and thus the battery pack can be fixed at a designated position by utilizing the side beam assembly 1.

[0161] In some specific embodiments of the present invention, the main body 61 is connected to at least a portion of the multi-layer structure of the side beam assembly 1 by welding or bonding.

[0162] In some embodiments, the side beam assembly 1 and the main body 61 are welded and fixedly connected, for example, the side beam assembly 1 and the main body 61 are welded and fixedly connected together by argon arc welding and spot welding.

[0163] In some specific embodiments of the present invention, the fixing portion 62 is connected to at least a portion of the multi-layer structure of the side beam assembly 1 by welding or bonding.

[0164] In some embodiments, the side beam assembly 1 is fixedly connected to the tray 6 by welding, for example, the side beam assembly 1 is fixedly connected to the main body 61 by welding through argon arc welding and spot welding.

[0165] In some embodiments, the tray 6 is formed by integrally stamping a steel plate, the main body portion 61 and the multi-layer structure of the side beam assembly 1 can be fixed by argon arc welding, and the fixing portion 62 and the multi-layer structure of the side beam assembly 1 can be fixed by argon arc welding.

[0166] In some embodiments, Fig. 9 As shown, the first part 11 and f2 define a first multilayer structure 31, and the second part 12 and segments h2 and m2 define a second multilayer structure 32. The first multilayer structure 31 is located at the lower end of the fixing portion 62, and the second multilayer structure 32 is located at the bottom of the accommodating cavity 611.

[0167] According to some optional embodiments of the present invention, a portion of the side beam assembly 1 is spaced apart from the tray 6 to define a second buffer cavity 71 .

[0168] In some embodiments, there is a gap between the first portion 11 and the outer wall of the accommodating cavity 611 to define a second buffer cavity 71. The existence of the second buffer cavity 71 enables the tray 6 to have deformation space when squeezed, thereby improving energy absorption and better protecting the battery cells.

[0169] In some examples, a dimension of the gap between the first portion 11 and the outer side wall of the accommodating cavity 611 in the second direction is 3 mm-10 mm.

[0170] In some embodiments of the present invention, Figure 6 , Fig. 9As shown, the bottom of the accommodating cavity 611 has a reinforcing protrusion 63 that protrudes downward to increase the structural strength of the pallet 6 and improve the bearing capacity of the pallet 6. The second part 12 is located at the lower end of the bottom of the accommodating cavity 611, and at least part of the second part 12 adaptively protrudes downward to adapt to the shape of the bottom of the pallet 6, thereby improving the adaptability of the first beam 10 and the pallet 6.

[0171] In some embodiments of the present invention, a through hole may be reserved on the first portion 11 of the first beam 10 so as to fix the tray 6 and the first portion 11 with screws or bolts, thereby fixing the first beam 10 and the tray 6 together.

[0172] In some embodiments of the present invention, the battery pack case 1000 further includes a bottom guard plate, which is disposed below the second portion 12 of the first beam 10 , and a through hole may be reserved on the second portion 12 to fix the second portion 12 and the bottom guard plate together.

[0173] In some embodiments of the present invention, Figure 7 , Fig.10 As shown, the battery pack box 1000 also includes two side beam assemblies 1 and two reinforcing plates 82. The two side beam assemblies 1 are arranged at both ends of the tray 6 in the second direction, and the third direction of the side beam assembly 1 extends along the third direction. The two reinforcing plates 82 are arranged at both ends of the tray 6 in the third direction, and the third direction of the reinforcing plates extends along the second direction. The second direction, the third direction and the first direction are perpendicular to each other.

[0174] The reinforcing plate 82 is made of a steel plate that is stamped and then bent, and is welded to the tray 6 by spot welding, thereby increasing the structural strength of the tray 6 at both ends in the third direction and improving the overall structural stability of the tray 6 .

[0175] In some examples, the battery pack body 1000 also includes an expansion beam 81, which is disposed in the accommodating cavity 611. The expansion beam 81 is welded to the tray 6 by argon arc welding. The expansion beam 81 is used to limit the battery cells in the accommodating cavity 611 to ensure the life and safety of the battery cells.

[0176] The battery pack according to the embodiment of the present invention is described below. The battery pack according to the embodiment of the present invention comprises a case and the battery pack case 1000 according to the above embodiment of the present invention.

[0177] The battery cells are placed in the tray 6 , so that the tray 6 is used to accommodate the battery cells, and the tray 6 is used to arrange the battery cells at designated positions.

[0178] According to the battery pack of the embodiment of the present invention, by utilizing the battery pack case 1000 according to the above-mentioned embodiment of the present invention, according to the distribution of stress on the side beam assembly 1, the area with greater stress is located in the multi-layer structure, so that the side beam assembly 1 bears the load according to the actual situation, so that the multi-layer wall thickness with more layers is designed in the area of ​​the battery pack case 1000 with greater stress, the stiffness of the area is increased, and the stress of the battery pack case 1000 is dispersed, and the multi-layer structure with fewer layers is designed in the area of ​​the battery pack case 1000 with less stress, so as to ensure the stiffness in the area while reducing the weight, so as to increase the stiffness of the battery pack case 1000 according to the actual load condition of the battery pack case 1000 and improve the reinforcement effect of the battery pack case 1000.

[0179] In some embodiments of the present invention, a plurality of battery cells are disposed in the box body, and the plurality of battery cells are arranged along the third direction of the side beam assembly 1 . The tray 6 includes a main body 61 , and the main body 61 defines a accommodating cavity 611 , and the plurality of battery cells are placed in the accommodating cavity 611 .

[0180] Among them, Fig. 9 As shown, the length of the overlapping portion of the side beam assembly 1 and the main body 61 in the second direction is L1, the first direction, the second direction and the third direction are perpendicular to each other, the thickness of the shell of each battery cell is L2, and the battery pack satisfies: L1 / L2≥3, so that at least the side beam assembly 1 is used to bear part of the gravity of the battery cell, and then the side beam assembly 1 and the tray 6 are used to jointly support the battery cell.

[0181] like Fig. 9 As shown, the overlapping portion of the second portion 12 of the first beam 10 and the main body 61 has a length L1 in the second direction, and at least part of the first beam 10 extends below some of the battery cells (it should be understood here that the above direction limitation is only for the convenience of describing the accompanying drawings and will not limit the actual setting position and direction of the side beam assembly 1), and then the first beam 10 and the tray 6 are used to jointly support the battery cells.

[0182] In some examples, the third direction of the battery cell extends along the second direction, and the length of the battery cell is L3, wherein L1 is greater than one twentieth of L3.

[0183] Specifically, the first direction is the height direction of the battery pack case 1000 , the second direction is the width direction of the tray 6 , and the third direction is the length direction of the tray 6 .

[0184] In some embodiments of the present invention, the dimension of the tray 6 in the first direction is H, and the height proportion of b2 is 60%H-70%H.

[0185] In some specific embodiments of the present invention, for an ordinary battery pack, the first-order natural frequency of the battery pack is 33.108 Hz. By optimizing the design of the side beam assembly 1, the first-order natural frequency of the battery pack can be made to reach 37.23, with a change of 33%, so as to increase the first-order natural frequency of the battery pack and enhance the overall structural strength of the battery pack. When the battery pack is vibrated, the battery pack is less likely to resonate, thereby protecting the battery cells in the battery pack.

[0186] In addition, for ordinary battery packs, the 3σ stress of the tray 6 is 202MPa, the 3σ stress of the side beam assembly 1 is 402MPa, the 3σ stress of the battery cell shell is 53MPa, the stress of the sleeve is 266MPa, and the 3σ stress of the weld between the tray and the variable assembly is 333MPa.

[0187] After optimizing the design of the side beam assembly 1, the 3σ stress of the tray 6 is 156MPa, the 3σ stress of the side beam assembly 1 is 383MPa, the 3σ stress of the battery cell casing is 49MPa, the stress of the sleeve is 80MPa, and the 3σ stress of the weld between the tray and the variable assembly is 274MPa, so as to reduce the stress concentrated on the tray 6, the side beam assembly 1, the battery cell casing and the sleeve.

[0188] The following describes an electric device according to an embodiment of the present invention. The electric device according to an embodiment of the present invention includes a battery pack according to the above embodiment of the present invention.

[0189] According to the electrical equipment of the embodiment of the present invention, by utilizing the battery pack according to the above-mentioned embodiment of the present invention, according to the distribution of stress on the side beam assembly 1, the area with greater stress is located in the multi-layer structure, so that the side beam assembly 1 bears the load according to the actual situation, so that a multi-layer wall thickness with more layers is designed in the area where the battery pack case 1000 is subjected to greater force, the rigidity of the area is increased, and the force of the battery pack case 1000 is dispersed, and a multi-layer structure with fewer layers is designed in the area where the battery pack case 1000 is subjected to less force, so as to ensure the rigidity in the area while reducing the weight, so as to increase the rigidity of the battery pack case 1000 according to the actual load condition of the battery pack case 1000 and improve the reinforcement effect of the battery pack case 1000.

[0190] Other structures and operations of the battery pack and the electrical equipment according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0191] 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 positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0192] 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.

[0193] In the description of the present invention, 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0194] 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.

[0195] 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 side beam assembly (1) of a battery pack box, characterized in that: include: a first beam (10); a second beam (20), the second beam (20) defining at least one cavity, the first beam (10) being connected to the second beam (20), in a first direction, at least a portion of the first beam (10) and at least a portion of the second beam (20) overlapping to define a multi-layer structure, The side beam assembly (1) comprises a first multi-layer structure (31) and a second multi-layer structure (32), and the first multi-layer structure (31) and the second multi-layer structure (32) have different numbers of layers.

2. The side beam assembly (1) of the battery pack box according to claim 1, characterized in that: The number of layers of the second multilayer structure (32) is greater than the number of layers of the first multilayer structure (31).

3. The side beam assembly (1) of the battery pack box according to claim 2, characterized in that: The first multi-layer structure (31) is a structure of at least two layers; and / or the second multi-layer structure (32) is a structure of at least three layers.

4. The side beam assembly (1) of the battery pack box according to claim 2, characterized in that: The first multi-layer structure (31) is a two-layer structure and is defined by overlapping a single-layer first beam (10) and a single-layer second beam (20); and / or, The second multi-layer structure (32) is defined by the overlapping multi-layer portions of the second beam (20) and the overlapping single-layer portions of the first beam (10).

5. The side beam assembly (1) of the battery pack box according to any one of claims 1 to 4, characterized in that: The first beam (10) is an integral roll-formed structure; and / or the second beam (20) is an integral roll-formed structure.

6. The side beam assembly (1) of the battery pack box according to any one of claims 1 to 4, characterized in that: The second beam (20) is bent to define a plurality of cavities.

7. The side beam assembly (1) of the battery pack box according to claim 6, characterized in that: In the first direction, at least two of the cavities are arranged adjacent to each other; and / or At least two of the cavities are adjacently arranged in a second direction, and the second direction is perpendicular to the first direction.

8. The side beam assembly (1) of the battery pack box according to claim 6, characterized in that: In the second direction, at least one cavity is located on one side of the multilayer structure; and / or In the first direction, at least one cavity is located on one side of the multilayer structure.

9. The side beam assembly (1) of the battery pack box according to claim 6, characterized in that: The plurality of cavities include a first cavity (211) and a second cavity (212), wherein the first cavity (211) and the second cavity (212) are adjacently arranged in the first direction.

10. The side beam assembly (1) of the battery pack box according to claim 9, characterized in that: The plurality of cavities further comprises a third cavity (213). In the second direction, the third cavity (213) is located on one side of the first cavity (211) and the second cavity (212).

11. The side beam assembly (1) of the battery pack box according to claim 6, characterized in that: The plurality of cavities further includes a fourth cavity (214). In the second direction, the fourth cavity (214) is located on one side of the second multilayer structure (32).

12. The side beam assembly (1) of the battery pack box according to any one of claims 1 to 4, characterized in that: At least a portion of the first beam (10) and at least a portion of the second beam (20) are spaced apart to define a first buffer cavity (41).

13. The side beam assembly (1) of the battery pack box according to any one of claims 1 to 4, characterized in that: In the first direction, the first beam (10) comprises a first portion (11), a connecting portion (13) and a second portion (12); the first portion (11) and the second portion (12) are arranged at an interval in terms of projections on a plane perpendicular to the first direction; and two ends of the connecting portion (13) are respectively connected to the first portion (11) and the second portion (12).

14. The side beam assembly (1) of the battery pack box according to claim 13, characterized in that: The second beam (20) cooperates with the first part (11) and the second part (12) to define the multi-layer structure.

15. The side beam assembly (1) of the battery pack box according to claim 13, characterized in that: At least a portion of the second beam (20) is spaced apart from the connecting portion (13) to define a first buffer cavity (41).

16. The side beam assembly (1) of the battery pack box according to claim 13, characterized in that: At least one cavity is defined between at least one of the first portion (11) and the second portion (12) and the second beam (20).

17. The side beam assembly (1) of the battery pack box according to claim 16, characterized in that: At least a portion of the second beam (20) is recessed in a direction away from the first portion (11) to define a fifth cavity (215) between the second beam (20) and the first portion (11); and / or At least a portion of the second portion (12) is recessed in a direction away from the second beam (20) to define a sixth cavity (216) between the second portion (12) and the second beam (20).

18. A battery pack box (1000), characterized in that: include: Tray (6); A side beam assembly (1), wherein the side beam assembly (1) is the side beam assembly (1) according to any one of claims 1 to 17, and the side beam assembly (1) is connected to the pallet (6).

19. The battery pack case (1000) according to claim 18, characterized in that: The first beam (10) is located between the second beam (20) and the pallet (6), and the first beam (10) is connected to the pallet (6).

20. The battery pack case (1000) according to claim 19, characterized in that: The tray (6) comprises a main body (61) defining a receiving cavity (611) and a fixing portion (62) connected to the main body (61) at an edge of an opening of the receiving cavity (611); The side beam assembly (1) is respectively connected to the main body portion (61) and / or the fixing portion (62).

21. The battery pack case (1000) according to claim 20, characterized in that: The pallet (6) is a steel pallet; and / or The tray (6) is an integral stamping structure.

22. The battery pack case (1000) according to claim 20, characterized in that: The main body portion (61) and / or the fixing portion (62) are connected to at least a portion of the multilayer structure of the side beam assembly (1).

23. The battery pack case (1000) according to claim 22, characterized in that: The main body (61) is connected to at least a portion of the multilayer structure of the side beam assembly (1) by welding or adhesive bonding; and / or The fixing portion (62) is connected to at least a portion of the multilayer structure of the side beam assembly (1) by welding or bonding.

24. The battery pack case (1000) according to claim 18, characterized in that: A portion of the side beam assembly (1) is spaced apart from the tray (6) to define a second buffer cavity (71).

25. A battery pack, characterized in that: include: A box, the box being a battery pack box (1000) according to any one of claims 18 to 24; A battery cell is placed in the tray (6).

26. The battery pack according to claim 25, characterized in that: A plurality of battery cells are arranged in the box body along the third direction of the side beam assembly (1); the tray (6) comprises a main body (61) defining a receiving cavity (611), and the plurality of battery cells are placed in the receiving cavity (611); The length of the portion where the side beam assembly (1) overlaps with the main body (61) in the second direction is L1, and the first direction, the second direction and the third direction are perpendicular to each other; The thickness of the shell of each battery cell is L2; ​​the battery pack satisfies: L1 / L2≥3.

27. An electrical equipment, characterized in that: Comprising a battery pack according to claim 25 or 26.

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