Battery pack and electric equipment

Abstract

The embodiment of the utility model discloses a battery pack and electric equipment. The battery pack comprises a box body, a battery module and a battery module, the battery pack is accommodated in the box body, and the battery pack comprises a plurality of single batteries; wherein the box body comprises a bottom plate; the edge beams are arranged along the edge of the bottom plate, and the edge beams and the bottom plate are matched to define a containing cavity; the reinforcing beams are arranged in the containing cavity so as to divide the containing cavity into a plurality of sub containing cavities used for containing battery packs, the reinforcing beams are connected with the two edge beams which are oppositely arranged or adjacently arranged respectively, and the reinforcing beams are obliquely arranged relative to the adjacent edge beams in the horizontal direction. According to the battery box, the overall structural stability of the box body is improved, the torsion resistance and impact resistance of the box body are improved, and finally the safety performance of the box body is improved, so that the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] With the rapid development of the new energy industry, battery packs with high capacity, high cycle life and high safety performance have been widely used and developed. At the same time, there is an urgent need for batteries with larger capacity, longer durability and greater safety. As one of the core parts of the battery pack, the safety performance of the box is closely related to the safety performance of the battery pack. Therefore, how to improve the safety performance of the box to improve the safety performance of the battery pack has become an urgent problem to be solved. Utility Model Content

[0003] The embodiments of the present application provide a battery pack and an electrical device to improve the safety performance of a box, thereby improving the safety performance of the battery pack.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a box is provided, comprising: a box; and

[0006] A battery pack is contained in the box, and the battery pack includes a plurality of single cells;

[0007] Wherein, the box body comprises: a bottom plate;

[0008] A plurality of side beams, each of which is arranged along an edge of the bottom plate, and each of which cooperates with the bottom plate to enclose a receiving cavity; and

[0009] A reinforcing beam is arranged in the accommodating cavity to divide the accommodating cavity into a plurality of sub-accommodating cavities for accommodating battery packs, and the reinforcing beam is respectively connected to two side beams that are arranged opposite to or adjacent to each other, and the reinforcing beam is arranged inclined relative to the adjacent side beams in the horizontal direction.

[0010] In addition to or as an alternative to one or more of the features disclosed above, the housing has a center point;

[0011] A plurality of reinforcing beams are provided, the plurality of reinforcing beams are centered on the central point and connected at the central point, and two adjacent reinforcing beams are provided at an angle.

[0012] In addition to or as an alternative to one or more of the features disclosed above, the reinforcing beams are provided in plurality, and two adjacent reinforcing beams are connected in pairs to cooperate to form a closed surface.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the side wall of the sub-accommodation chamber of the box body includes a first side wall, a second side wall and a third side wall, the first side wall, the second side wall and the third side wall are distributed along the circumference of the sub-accommodation chamber, the first side wall, the second side wall and the third side wall are arranged at an angle in pairs, and the angle formed by at least two of the first side wall, the second side wall and the third side wall is an acute angle;

[0014] The outer side wall of the battery pack includes a fourth side wall, a fifth side wall and a sixth side wall, the fourth side wall, the fifth side wall and the sixth side wall are distributed along the circumference of the battery pack, the fourth side wall, the fifth side wall and the sixth side wall are arranged at an angle in pairs, and the angle formed by at least two of the fourth side wall, the fifth side wall and the sixth side wall is an acute angle;

[0015] The battery pack is accommodated in the sub-accommodation cavity, the first side wall is arranged opposite to the fourth side wall, the second side wall is arranged opposite to the fifth side wall, and the third side wall is arranged opposite to the sixth side wall.

[0016] In addition to or as an alternative to one or more features disclosed above, the battery pack has a first direction and a reference plane perpendicular to the first direction;

[0017] The orthographic projection of the side wall of the sub-accommodation cavity on the reference plane is at least one of a right triangle and an isosceles triangle; and / or,

[0018] The orthographic projection of the battery pack on the reference plane is at least one of a right triangle and an isosceles triangle.

[0019] In addition to or as an alternative to one or more of the features disclosed above, the side beam and the reinforcing beam are integrally formed; or,

[0020] The side beam and the reinforcement beam are fixedly connected.

[0021] In addition to or as an alternative to one or more of the features disclosed above, the battery pack has a second direction and a third direction that intersect each other;

[0022] The box body further includes: a crossbeam extending along the second direction and disposed in the accommodating cavity, the crossbeam being connected to the side beam; and

[0023] A longitudinal beam extends along the third direction and is disposed in the accommodating cavity, wherein the longitudinal beam is connected to the side beam.

[0024] In addition to or as an alternative to one or more of the features disclosed above, the invention further includes: a filling body filled in at least one of the side beam, the reinforcing beam, the cross beam and the longitudinal beam.

[0025] In addition to or as an alternative to one or more of the features disclosed above, the invention further includes: a buffer portion disposed inside at least one of the side beam, the reinforcing beam, the cross beam and the longitudinal beam.

[0026] On the other hand, a battery pack is further disclosed, which, in addition to or instead of one or more of the features disclosed above, includes a battery pack as described in any one of the above items, and the battery pack serves as a power supply for the electrical device.

[0027] One of the above technical solutions has the following advantages or beneficial effects: the present application arranges a reinforcing beam in the box body, and the reinforcing beam is inclined relative to the adjacent side beam (that is, the reinforcing beam is not vertically arranged relative to the adjacent side beam), so that the reinforcing beam and the adjacent side beam form a triangular structure, thereby improving the overall structural stability of the box body, improving the torsion and impact resistance of the box body, and ultimately improving the safety performance of the box body, so as to improve the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0029] Figure 1 is an exploded structural view of a battery pack provided according to an embodiment of the present application;

[0030] Figure 2 is a top view of a battery pack with an upper cover hidden according to an embodiment of the present application;

[0031] Figure 3 is a three-dimensional structural view of a box provided according to an embodiment of the present application;

[0032] Figure 4 is a top view of a box provided according to an embodiment of the present application;

[0033] Figure 5 is a top view of a battery pack provided according to an embodiment of the present application;

[0034] Figure 6 It is a top view of a box provided according to another embodiment of the present application.

[0035] Description of reference numerals:

[0036] 100. Battery pack;

[0037] 110, box body; 111, bottom plate; 112, side beam; 113, accommodating chamber; 1131, sub-accommodating chamber; 11311, first side wall; 11312, second side wall; 11313, third side wall; 114, reinforcing beam; 115, center point; 116, cross beam; 117, longitudinal beam;

[0038] 120, battery pack; 121, single battery; 122, fourth side wall; 123, fifth side wall; 124, sixth side wall;

[0039] 130. Top cover. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] The connecting beams in the boxes used in existing battery packs are all horizontal and vertical structures, which leads to relatively poor structural stability of the box, and further leads to poor torsion and impact resistance of the box, which in turn affects the safety performance of the box and ultimately the safety performance of the battery pack; at the same time, the existing boxes cannot fully adapt to special-shaped batteries, resulting in low volume utilization of the box when accommodating special-shaped batteries.

[0045] In order to solve the above problems, in the embodiments of the present application, refer to Figures 1 to 6 The present application provides a battery pack 100 . Specifically, the battery pack 100 includes: a box body 110 , a battery pack 120 and an upper cover 130 .

[0046] Specifically, the battery pack 120 is accommodated in the box body 110 , and the battery pack 120 includes a plurality of single cells 121 ; the upper cover 130 is connected to the box body 110 , and the upper cover 130 covers the box body 110 to seal the box body 110 .

[0047] The single cell 121 may be a secondary battery, which refers to a single cell that can be used continuously by activating the active material by charging after the single cell is discharged. Exemplarily, the single cell 121 may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery or a nickel cadmium battery, but is not limited thereto.

[0048] The single battery 121 may be a triangular battery, a trapezoidal battery or other special-shaped battery, but is not limited thereto.

[0049] The single cell 121 includes a shell (not shown in the figure), an electrode assembly (not shown in the figure), an electrolyte, an end cap (not shown in the figure), a pole (not shown in the figure) and other functional components. The electrode assembly and the electrolyte are contained in the shell, and the electrolyte infiltrates the electrode assembly, and the end cap covers the shell to seal the shell. The electrode assembly is a component in the single cell 121 where an electrochemical reaction occurs, and there can be one or more electrode assemblies. The electrode assembly is mainly formed by stacking or winding a positive electrode sheet, a diaphragm and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active substances each constitute a pole ear. During the charge and discharge process of the single cell 121, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the pole ear is connected to the pole to form a current loop.

[0050] Specifically, the box body 110 includes a bottom plate 111 , side beams 112 and a reinforcing beam 114 .

[0051] A plurality of side beams 112 are provided, each of which is arranged along the edge of the bottom plate 111, and each side beam 112 cooperates with the bottom plate 111 to enclose a accommodating cavity 113; a reinforcing beam 114 is provided in the accommodating cavity 113 to divide the accommodating cavity 113 into a plurality of sub-accommodating cavities 1131, and the sub-accommodating cavities 1131 are used to accommodate the battery pack 120, and the reinforcing beams 114 are respectively connected to two side beams 112 that are arranged opposite to or adjacent to each other, and the reinforcing beams 114 are arranged obliquely relative to the adjacent side beams 112 in the horizontal direction (that is, the reinforcing beams 114 are not arranged vertically relative to the adjacent side beams 112).

[0052] The bottom plate 111 can be formed integrally with the side beam 112 and the reinforcing beam 114, or the bottom plate 111 can be separately provided with the side beam 112 and the reinforcing beam 114, and the two are fixedly connected, for example, the bottom plate 111, the side beam 112 and the reinforcing beam 114 are fixedly connected by welding, screwing and other processes, which are not specifically limited in this application and can be specifically provided according to actual circumstances. Exemplarily, the bottom plate 111, the side beam 112 and the reinforcing beam 114 are separately provided, and the bottom plate 111, the side beam 112 and the reinforcing beam 114 are fixedly connected by welding processes.

[0053] The bottom plate 111 , the side beam 112 and the reinforcing beam 114 are all made of common steel or aluminum, but are not limited thereto.

[0054] The side beam 112 and the reinforcing beam 114 can be formed by different molding processes according to different materials. Specifically, for example, when the side beam 112 and the reinforcing beam 114 are made of ordinary steel, the steel can be bent multiple times by using a bending device, and then welded to form the side beam 112 and the reinforcing beam 114 after the multiple bendings. When the side beam 112 and the reinforcing beam 114 are made of aluminum, the side beam 112 and the reinforcing beam 114 can be formed by extrusion, die casting, etc. using molding equipment.

[0055] The bottom plate 111 is formed by punching a steel plate using a punching device.

[0056] Among them, a plurality of criss-cross reinforcing ribs may be provided on the bottom plate 111 to increase the structural strength of the bottom plate 111, and to provide force support for the single battery 121, further enhancing the impact resistance and extrusion resistance of the box body 110, ensuring the overall stability of the battery pack, which is beneficial to increasing the service life of the battery pack and enhancing the safety performance of the battery pack.

[0057] The cross-sections of the side beam 112 and the reinforcing beam 114 may be triangles, quadrilaterals, pentagons, hexagons, or other shapes.

[0058] It can be understood that the present application provides a reinforcing beam 114 in the box body 110, and the reinforcing beam 114 is tilted relative to the adjacent side beam 112, so that the reinforcing beam 114 and the adjacent side beam 112 form a triangular structure, thereby improving the overall structural stability of the box body 110, improving the torsion and impact resistance of the box body 110, and ultimately improving the safety performance of the box body 110, so as to improve the safety performance of the battery pack 100; at the same time, because the reinforcing beam 114 and the adjacent side beam 112 form a triangular structure, the box body 110 is adapted to special-shaped batteries, which improves the volume utilization of the box body 110 when accommodating special-shaped batteries, thereby improving the energy density of the battery pack 100.

[0059] In one embodiment, referring to Figure 4 The box body has a center point 115; a plurality of reinforcing beams 114 are provided, the plurality of reinforcing beams 114 are centered on the center point 115 and the plurality of reinforcing beams 114 are connected at the center point 115, and two adjacent reinforcing beams 114 are arranged at an angle, that is, the plurality of reinforcing beams 114 are radially diffused with the center point 115 as the center, so as to further improve the overall structural stability of the box body 110, improve the torsion resistance and impact resistance of the box body 110, and facilitate the processing and forming of the box body 110.

[0060] In another embodiment, referring to Figure 6, a plurality of reinforcing beams 114 are provided, and two adjacent reinforcing beams 114 are connected in pairs to cooperate to form a closed surface, that is, the head and tail ends of two adjacent reinforcing beams 114 are connected in sequence so that the plurality of reinforcing beams 114 enclose a closed structure. Exemplarily, the plurality of reinforcing beams 114 can be connected in pairs to enclose a polygonal structure to further improve the overall structural stability of the box 110, improve the torsion resistance and impact resistance of the box 110, and facilitate the processing and forming of the box 110.

[0061] In one embodiment, referring to Figures 2 to 5 The side wall of the sub-accommodation cavity 1131 of the box body 110 includes a first side wall 11311, a second side wall 11312 and a third side wall 11313, and the first side wall 11311, the second side wall 11312 and the third side wall 11313 are distributed along the circumference of the sub-accommodation cavity 1131, and the first side wall 11311, the second side wall 11312 and the third side wall 11313 are arranged at an angle in pairs ... 3, the angle formed by at least two of them is an acute angle, that is, the first side wall 11311, the second side wall 11312 and the third side wall 11313 enclose a triangular sub-accommodation cavity 1131, so that the box body 110 is adapted to special-shaped batteries, thereby improving the volume utilization rate of the box body 110 when accommodating special-shaped batteries, and at the same time improving the overall structural stability of the box body 110, improving the torsion resistance and impact resistance of the box body 110, and finally improving the safety performance of the box body 110, so as to improve the safety performance of the battery pack 100.

[0062] The first side wall 11311 , the second side wall 11312 , and the third side wall 11313 may be the wall surface of the side beam 112 and the wall surface of the reinforcing beam 114 , but are not limited thereto.

[0063] The outer side wall of the battery pack 120 includes a fourth side wall 122, a fifth side wall 123 and a sixth side wall 124, which are distributed along the circumference of the battery pack 120, and the fourth side wall 122, the fifth side wall 123 and the sixth side wall 124 are arranged at angles in pairs, and the angle formed by at least two of the fourth side wall 122, the fifth side wall 123 and the sixth side wall 124 is an acute angle, that is, the battery pack 120 is a triangular battery pack, so as to improve the structural stability of the battery pack 120, improve the torsion resistance and impact resistance of the battery pack 120, and ultimately improve the safety performance of the battery pack 100.

[0064] Specifically, the battery pack 120 is accommodated in the sub-accommodation cavity 1131 , the first side wall 11311 is arranged opposite to the fourth side wall 122 , the second side wall 11312 is arranged opposite to the fifth side wall 123 , and the third side wall 11313 is arranged opposite to the sixth side wall 124 .

[0065] In the present application, a triangular sub-cavity 1131 and a battery pack 120 are provided in the box body 110, and the battery pack 120 is accommodated in the sub-cavity 1131, so as to further improve the structural stability of the battery pack 100, improve the torsion resistance and impact resistance of the battery pack 100, and finally improve the safety performance of the battery pack 100.

[0066] In one embodiment, the battery pack 100 has a second direction X, a third direction Y, a first direction Z, and a reference plane P perpendicular to the first direction Z. Exemplarily, the battery pack 100 has a second direction X, a third direction Y, and a first direction Z that are perpendicular to each other, and a reference plane P perpendicular to the first direction Z. Here, "perpendicular" refers to a state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0067] The orthographic projection of the side wall of the sub-cavity 1131 on the reference plane P is at least one of a right triangle and an isosceles triangle; the orthographic projection of the battery pack 120 on the reference plane P is at least one of a right triangle and an isosceles triangle, so that the shape of the sub-cavity 1131 is adapted to that of the battery pack 120, which facilitates the assembly of the battery pack 120 in the sub-cavity 1131, thereby improving the overall assembly efficiency of the battery pack 100.

[0068] In one embodiment, referring to Figure 4 , the angle between the side beam 112 and the adjacent reinforcing beam 114 is α, which satisfies: 30°≤α≤60°. That is, the angle α between the side beam 112 and the adjacent reinforcing beam 114 can be controlled within the range of 30° to 60°. For example, the angle α between the side beam 112 and the adjacent reinforcing beam 114 can be one of 30°, 35°, 40°, 45°, 50°, 55° or 60° or a range consisting of any two of them. The above specific values ​​of α are only given as examples, and any value within the range of 30° to 60° is within the protection scope of this application. In this application, by controlling the angle α between the side beam 112 and the adjacent reinforcing beam 114 within the range of 30° to 60°, the overall structural stability of the box 110 is further improved, the torsion resistance and impact resistance of the box 110 are improved, and finally the safety performance of the box 110 is improved, so as to improve the safety performance of the battery pack 100.

[0069] The angle α between the side beam 112 and the adjacent reinforcing beam 114 can be obtained by disassembling the actual battery pack 100, measuring the angle formed between the side beam 112 and the adjacent reinforcing beam 114 on the box 110 multiple times with a measuring tool, and calculating the average value. The measuring tool can be any one of an angle measuring instrument or other dimension measuring instruments, but is not limited thereto.

[0070] Furthermore, the angle α between the side beam 112 and the adjacent reinforcing beam 114 also satisfies: 40°≤α≤50°. That is, the angle α between the side beam 112 and the adjacent reinforcing beam 114 can be controlled within the range of 40° to 50°. For example, the angle α between the side beam 112 and the adjacent reinforcing beam 114 can be one of 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49° or 50°, or a range consisting of any two of them. The above specific values ​​of α are given for example only, and any value within the range of 40° to 50° is within the protection scope of the present application. In the present application, by controlling the angle α between the side beam 112 and the adjacent reinforcing beam 114 within the range of 40° to 50°, the overall structural stability of the box body 110 is further improved, the torsion resistance and impact resistance of the box body 110 are improved, and ultimately the safety performance of the box body 110 is improved, thereby improving the safety performance of the battery pack 100.

[0071] In one embodiment, referring to Figures 2 to 6 The box body 110 further includes: a cross beam 116 and a longitudinal beam 117. The cross beam 116 extends along the second direction X, is disposed in the accommodating cavity 113, and is connected to the side beam 112. The longitudinal beam 117 extends along the third direction Y, is disposed in the accommodating cavity 113, and is connected to the side beam 112. The point where the cross beam 116 and the longitudinal beam 117 intersect is the center point 115.

[0072] Among them, the cross beam 116 is welded and fixed to the side beam 112, and the longitudinal beam 117 is welded and fixed to the side beam 112 and the side beams 112 are welded and fixed to each other, so as to further improve the overall strength of the box body 110, enhance the impact and extrusion resistance of the box body 110, and at the same time reduce the risk of box deformation or even cracking caused by weld failure, thereby improving the safety performance of the battery pack 100.

[0073] The cross sections of the horizontal beam 116 and the longitudinal beam 117 are both in the shape of a cross section, but the present invention is not limited thereto.

[0074] The wall surfaces of the cross beam 116 and the longitudinal beam 117 may also constitute a first side wall 11311 , a second side wall 11312 and a third side wall 11313 .

[0075] In the present application, a cross beam 116 and a longitudinal beam 117 are provided in the box body 110, thereby further improving the overall strength of the box body 110, enhancing the impact resistance and extrusion resistance of the box body 110, ensuring the overall stability of the battery pack 100, and being beneficial to increasing the service life of the battery pack 100 and improving the safety performance of the battery pack 100.

[0076] In one embodiment, the battery pack 100 further includes: a filler (not shown), which is filled in at least one of the side beams 112, the reinforcing beams 114, the cross beams 116 and the longitudinal beams 117 to further enhance the structural strength of the side beams 112, the reinforcing beams 114, the cross beams 116 and the longitudinal beams 117, enhance the impact resistance and extrusion resistance of the box body 110, ensure the overall stability of the battery pack 100, and enhance the safety performance of the battery pack 100.

[0077] The material of the filler can be selected from materials with certain strength and low density, such as at least one of plastic, hard foam material, polyurethane adhesive, acrylic adhesive or epoxy resin adhesive, but not limited thereto.

[0078] In one embodiment, the battery pack 100 further includes a buffer portion (not shown), which is disposed inside at least one of the side beams 112, the reinforcing beams 114, the cross beams 116 and the longitudinal beams 117. That is, the buffer portion may be disposed inside the side beams 112, the reinforcing beams 114, the cross beams 116 and the longitudinal beams 117 to further enhance the structural strength of the side beams 112, the reinforcing beams 114, the cross beams 116 and the longitudinal beams 117, and enhance the impact resistance and extrusion resistance of the box body 110.

[0079] In one embodiment, the battery pack further includes: a liquid cooling element (not shown) and a battery management element (not shown), the liquid cooling element and the battery management element are both disposed in the housing 110, the liquid cooling element is disposed on the periphery of the single cell 121 to perform thermal management on the single cell 121; the battery management element is electrically connected to the single cell 121 to monitor and manage the single cell 121 in the housing 110 of the battery pack 100, thereby improving the safety performance of the battery pack 100.

[0080] Specifically, the battery management element may be any one of a battery pack disconnect unit and a battery management unit.

[0081] In summary, refer to Figure 2 When the battery pack 100 is subjected to a side impact force F1 in the second direction X and a side impact force F2 in the third direction Y, since a reinforcing beam 114 is disposed in the box body 110 and the reinforcing beam 114 is tilted relative to the adjacent side beam 112, so that a triangular structure is formed between the reinforcing beam 114 and the adjacent side beam 112, the overall structural stability of the box body 110 is improved, and the torsion resistance and impact resistance of the box body 110 are improved, and the battery pack 100 can be effectively protected to ensure the safety of the battery pack 100.

[0082] On the other hand, in an embodiment of the present application, the present application further provides an electrical device, which includes a battery pack as described in any of the above embodiments, and the battery pack serves as a power supply for the electrical device.

[0083] Among them, electrical devices may be, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0084] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack, characterized in that: include: Box; as well as A battery pack is contained in the box, and the battery pack includes a plurality of single cells; Wherein, the box body comprises: a bottom plate; A plurality of side beams, each of which is arranged along an edge of the bottom plate, and each of which cooperates with the bottom plate to enclose a receiving cavity; and A reinforcing beam is arranged in the accommodating cavity to divide the accommodating cavity into a plurality of sub-accommodating cavities for accommodating battery packs, and the reinforcing beam is respectively connected to two side beams that are arranged opposite to or adjacent to each other, and the reinforcing beam is arranged inclined relative to the adjacent side beams in the horizontal direction.

2. The battery pack according to claim 1, characterized in that: The box has a center point; A plurality of the reinforcing beams are provided, the plurality of the reinforcing beams are centered on the central point and the plurality of the reinforcing beams are connected at the central point, and two adjacent reinforcing beams are provided at an angle.

3. The battery pack according to claim 1, wherein: A plurality of reinforcing beams are provided, and two adjacent reinforcing beams are connected in pairs to form a closed surface.

4. The battery pack according to claim 1, wherein: The side wall of the sub-accommodation cavity of the box body comprises a first side wall, a second side wall and a third side wall, the first side wall, the second side wall and the third side wall are distributed along the circumference of the sub-accommodation cavity, the first side wall, the second side wall and the third side wall are arranged at an angle in pairs, and the angle formed by at least two of the first side wall, the second side wall and the third side wall is an acute angle; The outer side wall of the battery pack includes a fourth side wall, a fifth side wall and a sixth side wall, the fourth side wall, the fifth side wall and the sixth side wall are distributed along the circumference of the battery pack, the fourth side wall, the fifth side wall and the sixth side wall are arranged at an angle in pairs, and the angle formed by at least two of the fourth side wall, the fifth side wall and the sixth side wall is an acute angle; The battery pack is accommodated in the sub-accommodation cavity, the first side wall is arranged opposite to the fourth side wall, the second side wall is arranged opposite to the fifth side wall, and the third side wall is arranged opposite to the sixth side wall.

5. The battery pack according to claim 4, characterized in that: The battery pack has a first direction and a reference plane perpendicular to the first direction; The orthographic projection of the side wall of the sub-accommodation cavity on the reference plane is at least one of a right triangle and an isosceles triangle; and / or, The orthographic projection of the battery pack on the reference plane is at least one of a right triangle and an isosceles triangle.

6. The battery pack according to claim 1, wherein: The side beam and the reinforcing beam are integrally formed; or, The side beam and the reinforcement beam are fixedly connected.

7. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack has a second direction and a third direction intersecting each other; The box body further includes: a crossbeam extending along the second direction and disposed in the accommodating cavity, the crossbeam being connected to the side beam; and A longitudinal beam extends along the third direction and is disposed in the accommodating cavity, wherein the longitudinal beam is connected to the side beam.

8. The battery pack according to claim 7, characterized in that: Also includes: A filling body is filled in at least one of the side beams, the reinforcing beams, the cross beams and the longitudinal beams.

9. The battery pack according to claim 7, characterized in that: Also includes: The buffer portion is disposed inside at least one of the side beam, the reinforcing beam, the cross beam, and the longitudinal beam.

10. An electrical device, characterized in that: It comprises a battery pack as claimed in any one of claims 1 to 9, wherein the battery pack serves as a power supply for the electrical device.

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