Box body and battery pack

Abstract

The utility model discloses a box body and a battery pack, the box body is used for the battery pack, and the box body comprises two edge beams, two side beams, a first side beam and a second side beam, the two ends, in the first direction, of the first bottom protection plate are connected with the two edge beams correspondingly, a mounting cavity is formed between the first bottom protection plate and the two edge beams, part of the first bottom protection plate is concaved towards the mounting cavity to form a groove, and the first bottom protection plate and the two edge beams are a first sheet metal part which is bent to form an integrated piece; and the second bottom protection plate is arranged in the groove, the two ends, in the first direction, of the second bottom protection plate are welded and / or bonded to the two side walls, in the first direction, of the groove correspondingly, and the second bottom protection plate is formed by a second sheet metal part. According to the box body provided by the utility model, the integrity of the box body is improved, the stress of the box body is better, the structural strength is higher, and meanwhile, the arrangement of fastening holes such as screw holes is also reduced, so that the sealing performance of the box body is improved, the air leakage is reduced, and the waterproof and dustproof performance is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a box and a battery pack. Background Art

[0002] Common single-layer sheet metal bottom guards have weak energy absorption, poor impact resistance, and weak bottom protection. When multiple layers of bottom guards and side beams are connected by bolts, the bolts may have torque attenuation, resulting in insufficient strength of the entire package and airtight failure of the entire package. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a box body, which has good integrity and higher structural strength, and also improves the sealing of the box body, reduces air leakage, and improves waterproof and dustproof performance.

[0004] The utility model also provides a battery pack, comprising the above-mentioned box body.

[0005] According to the box body of the embodiment of the utility model, which is used for a battery pack, the box body includes: two side beams, which are spaced apart in a first direction; a first bottom guard plate, whose two ends along the first direction are respectively connected to the two side beams, and a mounting cavity is formed between the first bottom guard plate and the two side beams, and a portion of the first bottom guard plate is recessed toward the mounting cavity to form a groove, and the first bottom guard plate and the two side beams are formed into an integral part by bending a first sheet metal part; a second bottom guard plate, which is arranged in the groove, and whose two ends along the first direction are respectively welded and / or bonded to the two side walls of the groove along the first direction, and the second bottom guard plate is formed by a second sheet metal part.

[0006] According to the box body of the embodiment of the utility model, the first bottom guard plate and two side beams are bent through the first sheet metal to form an integral part, a part of the first bottom guard plate is recessed toward the installation cavity to form a groove, the second bottom guard plate is arranged in the groove, and the two ends of the second bottom guard plate along the first direction are respectively welded and / or bonded to the two side walls of the groove along the first direction, and the second bottom guard plate is formed through the second sheet metal. Thus, the integrity of the box body is improved, and at the same time, the second bottom guard plate and the first bottom guard plate jointly form a multi-layer bottom guard plate structure, so that the box body is better stressed and has a higher structural strength, and at the same time, the setting of fastening holes such as screw holes is reduced, thereby improving the sealing of the box body, reducing air leakage, and improving waterproof and dustproof performance.

[0007] In some embodiments of the present invention, the second bottom guard plate is an annular column extending along the second direction, the annular column is formed as an integral piece by bending the second sheet metal part, the annular column has a first cavity therein, the first cavity extends along the second direction, and the first direction and the second direction are perpendicular to each other.

[0008] In some embodiments of the present invention, one end of the second bottom guard plate along the third direction facing the installation cavity is spaced apart from the bottom wall of the groove, and the first direction, the second direction and the third direction are perpendicular to each other.

[0009] In some embodiments of the present invention, a buffer is provided between one end of the second bottom guard plate along the third direction facing the installation cavity and the bottom wall of the groove; and / or, a buffer is provided in the first cavity; and / or, the two ends of the second bottom guard plate along the first direction are respectively connected to the two side walls of the groove along the first direction, the width of the connecting part is L1, the distance between one end of the second bottom guard plate along the third direction facing the installation cavity and the bottom wall of the groove is h1, and the height of the first cavity along the third direction is h2, h1≥3mm, L1>h2, h2≥2*h1.

[0010] In some embodiments of the utility model, along the direction from the installation cavity to the groove, the two side walls of the groove along the first direction are inclined away from the center of the groove, and the two ends of the second bottom guard plate along the first direction are inclined away from the center of the groove. The angles between the two side walls of the groove along the first direction and the bottom wall of the groove are both β, and they are connected by rounded corners. Among the two ends of the second bottom guard plate along the third direction, the angles between the end relatively close to the installation cavity and the two ends of the second bottom guard plate along the first direction are both β, and they are connected by rounded corners. The angles between the end relatively far from the installation cavity and the two ends of the second bottom guard plate along the first direction are both α, and they are connected by rounded corners. 130°≤β≤140°, 40°≤α≤50°, α+β=180°, the outer diameter of the rounded corner is R, R≥3mm, and the first direction, the second direction and the third direction are perpendicular to each other.

[0011] In some embodiments of the present invention, the side beam includes a first section, a second section, a third section, a fourth section, a fifth section, a sixth section, a seventh section and an eighth section connected in sequence, the first section is arranged on a side of the third section and the seventh section away from the installation cavity along the first direction, the first section extends along a third direction, one end of the first section is connected to the second section, and the other end is connected to the first bottom guard plate, the second section, the fourth section, the eighth section and the sixth section are arranged in sequence in the third direction and extend along the first direction, the second section is located on a side of the sixth section away from the second bottom guard plate, the first section, the fourth section, the eighth section and the sixth section are arranged in sequence in the third direction and extend in the first direction The third section, the fifth section and the seventh section are arranged in the first direction and extend along the third direction. The third section is located on the side of the seventh section away from the second bottom guard plate. A second cavity is formed between the first section, the second section, the third section, the sixth section and the seventh section. The fourth section, the fifth section and the eighth section are all arranged in the second cavity. The fourth section divides the second cavity into a first sub-cavity and a second sub-cavity. The fifth section is stacked and fitted with the first section. The eighth section is stacked and connected with the fourth section. The first direction, the second direction and the third direction are perpendicular to each other.

[0012] In some embodiments of the present invention, part of the sixth section is separated from the first bottom guard plate to form a third cavity, the height of the third cavity along the third direction is h3, the height of the first cavity along the third direction is h2, h3≥h2; and / or, part of the first bottom guard plate protrudes toward the installation cavity to form a protrusion, the protrusion is arranged corresponding to the groove, one end of the protrusion along the first direction and the third direction are connected to the sixth section, the width of the connecting part of one end of the protrusion along the first direction and the sixth section is L2, the width of the connecting part of one end of the protrusion along the third direction and the sixth section is L3, the distance between one end of the second bottom guard plate along the third direction facing the installation cavity and the bottom wall of the groove is h1, the length of the second cavity along the first direction is L4, L2≥3mm, L2>h1, L3≥L4 / 6.

[0013] In some embodiments of the utility model, the fourth segment includes a straight segment and a curved segment, there are two curved segments, which are respectively arranged at both ends of the straight segment, the eighth segment is stacked and connected with the straight segment, the length of the straight segment is L5, the width of the connecting part of the eighth segment and the straight segment is L6, 3mm≤L6≤(L5 / 2)mm; and / or, along the direction from the third segment to the first segment, the fourth segment and the eighth segment both extend obliquely toward the first bottom guard plate, the angle between the fourth segment and the third segment is β, the angle between the eighth segment and the seventh segment is α, 130°≤β≤140°, 40°≤α≤50°, α+β=180°; and / or, the fourth segment is connected to the third segment by a rounded corner, the eighth segment is connected to the seventh segment by a rounded corner, the outer diameter of the rounded corner is R, R≥3mm.

[0014] In some embodiments of the present invention, the first sheet metal component is a steel plate; and / or the second sheet metal component is a steel plate.

[0015] A battery pack according to an embodiment of the present invention includes the above-mentioned box body.

[0016] According to the battery pack of the embodiment of the utility model, by setting the above-mentioned box body, the first bottom guard plate and the two side beams are bent through the first sheet metal to form an integral part, the part of the first bottom guard plate is recessed toward the installation cavity to form a groove, the second bottom guard plate is arranged in the groove, the two ends of the second bottom guard plate along the first direction are respectively welded and / or bonded to the two side walls of the groove along the first direction, and the second bottom guard plate is formed through the second sheet metal. Thereby, the integrity of the box body is improved, and at the same time, the second bottom guard plate and the first bottom guard plate jointly form a multi-layer bottom guard plate structure, so that the box body is better stressed and has a higher structural strength, and at the same time, the setting of fastening holes such as screw holes is reduced, thereby improving the sealing of the box body, reducing air leakage, and improving waterproof and dustproof performance.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 is a cross-sectional view of a box according to an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 The enlarged view of A in the figure shows the relationship between the various structures;

[0021] Figure 3 yes Figure 1 An enlarged view of point A in FIG. 1 , wherein represents the size of each structure.

[0022] Reference numerals:

[0023] 10. Box body;

[0024] 1. side beam; 11. first section; 12. second section; 13. third section; 14. fourth section; 15. fifth section; 16. sixth section; 17. seventh section; 18. eighth section; 19. second cavity; 191. first sub-cavity; 192. second sub-cavity;

[0025] 2. first bottom guard plate; 21. groove; 22. raised portion;

[0026] 3. Second bottom guard plate; 31. First cavity;

[0027] 4. Installation cavity;

[0028] 5. The third cavity. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present utility model, it is necessary to understand 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 accompanying drawings, and are only for the convenience of describing the present utility model 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 utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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.

[0032] Reference below Figure 1-Figure 3 The box 10 according to the embodiment of the present invention is described.

[0033] like Figure 1-Figure 3 As shown, the box body 10 according to an embodiment of the utility model is used for a battery pack, and the box body 10 includes: two side beams 1, a first bottom guard plate 2 and a second bottom guard plate 3.

[0034] Specifically, refer to Figure 1 and Figure 2 , the two side beams 1 are in the first direction (such as Figure 1 The two ends of the first bottom guard plate 2 along the first direction are respectively connected to the two side beams 1, and a mounting cavity 4 is formed between the first bottom guard plate 2 and the two side beams 1. A portion of the first bottom guard plate 2 is recessed toward the mounting cavity 4 to form a groove 21. The first bottom guard plate 2 and the two side beams 1 are bent into an integral part by a first sheet metal part.

[0035] It should be noted that the installation cavity 4 is used to install structures such as battery modules, and the first bottom guard plate 2 and the two side beams 1 can protect structures such as battery modules. Since the first bottom guard plate 2 and the two side beams 1 are formed into an integral part by bending the first sheet metal part, compared with the first bottom guard plate and the two side beams connected by fasteners such as screws, the integrity of the box body 10 is improved, so that the box body 10 has better force and higher structural strength, and the setting of fastening holes such as screw holes is also reduced, thereby improving the sealing of the box body 10, reducing air leakage, and improving waterproof and dustproof performance.

[0036] Furthermore, if Figure 1 and Figure 2 As shown, the second bottom guard plate 3 is arranged in the groove 21, and the two ends of the second bottom guard plate 3 along the first direction are respectively welded and / or bonded to the two side walls of the groove 21 along the first direction, and the second bottom guard plate 3 is formed by a second sheet metal part.

[0037] It can be understood that, by arranging the second bottom guard plate 3 in the groove 21, the second bottom guard plate 3 and the first bottom guard plate 2 together form a multi-layer bottom guard plate structure, thereby further improving the structural reliability of the box 10. At the same time, since the two ends of the second bottom guard plate 3 along the first direction are respectively welded and / or bonded to the two side walls of the groove 21 along the first direction, and the second bottom guard plate 3 is formed by the second sheet metal part, that is, the second bottom guard plate 3 is an integral part, thereby further improving the integrity of the box 10, making the box 10 better in force and having a higher structural strength, and at the same time reducing the setting of fastening holes such as screw holes on the first bottom guard plate 2 and the second bottom guard plate 3, thereby further improving the sealing of the box 10, reducing air leakage, and improving the waterproof and dustproof performance.

[0038] According to the box body 10 of the embodiment of the utility model, the first bottom guard plate 2 and the two side beams 1 are bent through the first sheet metal to form an integral part, the first bottom guard plate 2 is partially recessed toward the installation cavity 4 to form a groove 21, the second bottom guard plate 3 is arranged in the groove 21, the two ends of the second bottom guard plate 3 along the first direction are respectively welded and / or bonded to the two side walls of the groove 21 along the first direction, and the second bottom guard plate 3 is formed through the second sheet metal. Thus, the integrity of the box body 10 is improved, and at the same time, the second bottom guard plate 3 and the first bottom guard plate 2 jointly form a multi-layer bottom guard plate structure, so that the box body 10 is better stressed and has a higher structural strength, and at the same time, the setting of fastening holes such as screw holes is reduced, thereby improving the sealing of the box body 10, reducing air leakage, and improving the waterproof and dustproof performance.

[0039] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the second bottom guard plate 3 is an annular column extending along the second direction (the second direction is not shown in the figure), and the annular column is formed into an integral part by bending the second sheet metal part, wherein the annular column is formed into an integral part by bending the second sheet metal part, thereby further improving the integrity of the box body 10, so that the box body 10 has better force and higher structural strength. At the same time, the second bottom guard plate 3 is an annular column extending along the second direction, so that the second bottom guard plate 3 along the third direction (such as Figure 1 The two ends of the box body 10 (in the direction b shown) form a two-layer bottom guard plate structure. As a result, the first bottom guard plate 2 and the second bottom guard plate 3 together form a three-layer bottom guard plate structure, thereby further improving the structural strength of the box body 10.

[0040] Furthermore, if Figure 1 and Figure 2As shown, the annular column has a first cavity 31, and the first cavity 31 extends along the second direction, and the first direction and the second direction are perpendicular to each other. It can be understood that the provision of the first cavity 31 can reduce the weight of the second bottom guard plate 3, and realize the economy and lightness of the box body 10, and at the same time, by providing the first cavity 31, the second bottom guard plate 3 has a certain deformation space, so that the second bottom guard plate 3 can absorb the collision energy through a certain deformation, thereby improving the protection of the battery module and other structures.

[0041] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the second bottom guard plate 3 is along the third direction (such as Figure 1 The end of the mounting cavity 4 in the direction b) shown in the figure is spaced apart from the bottom wall of the groove 21, and the first direction, the second direction and the third direction are perpendicular to each other.

[0042] It can be understood that since one end of the second bottom guard plate 3 along the third direction facing the mounting cavity 4 is separated from the bottom wall of the groove 21, the deformation of the second bottom guard plate 3 is reduced to affect the first bottom guard plate 2. At the same time, the vibration isolation effect between the second bottom guard plate 3 and the first bottom guard plate 2 can also be improved, thereby further improving the protection of structures such as battery modules.

[0043] In some embodiments of the utility model, a buffer is provided between the end of the second bottom guard plate 3 along the third direction facing the installation cavity 4 and the bottom wall of the groove 21; thereby, the vibration reduction effect between the first bottom guard plate 2 and the second bottom guard plate 3 is improved, thereby further improving the protection of the battery module and other structures. The buffer may be foam, rubber, etc.

[0044] In some embodiments of the present invention, a buffer is provided in the first cavity 31, thereby improving the vibration reduction effect of the second bottom guard plate 3, thereby further improving the protection of the battery module and other structures. The buffer may be foam, rubber, and the like.

[0045] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the two ends of the second bottom guard plate 3 along the first direction are respectively connected to the two side walls of the groove 21 along the first direction, the width of the connection portion is L1, the distance between the end of the second bottom guard plate 3 facing the installation cavity 4 along the third direction and the bottom wall of the groove 21 is h1, the height of the first cavity 31 along the third direction is h2, h1≥3mm, L1>h2, h2≥2*h1, wherein h1 can be 3mm, 4mm, 5mm or 6mm, etc., h2 can be 6mm, 8mm, 10mm or 12mm, etc., L1 can be 7mm, 9mm, 11mm or 13mm, etc. It should be noted that the width of the connection portion refers to the width along the first direction.

[0046] It is understandable that if Figure 3 As shown, h1≥3mm, so that there is a sufficient distance between the end of the second bottom guard plate 3 facing the installation cavity 4 along the third direction and the bottom wall of the groove 21, so that the deformation of the second bottom guard plate 3 can further reduce the influence of the first bottom guard plate 2, and at the same time, the vibration isolation effect between the second bottom guard plate 3 and the first bottom guard plate 2 can be further improved, so as to further improve the protection of structures such as battery modules. Among them, when there is a buffer between the end of the second bottom guard plate 3 facing the installation cavity 4 along the third direction and the bottom wall of the groove 21, the buffer can have a sufficient height along the third direction, so as to further improve the vibration reduction effect between the first bottom guard plate 2 and the second bottom guard plate 3, so as to further improve the protection of structures such as battery modules.

[0047] Furthermore, if Figure 3 As shown, h2≥2*h1, so that the first cavity 31 has a sufficient height along the third direction, and further the second bottom guard plate 3 has a deformation space, so that the second bottom guard plate 3 can absorb the collision energy through a certain deformation, thereby improving the protection of the battery module and other structures. At the same time, when a buffer is provided in the first cavity 31, the buffer can have a sufficient height along the third direction, thereby further improving the vibration reduction effect of the second bottom guard plate 3, thereby further improving the protection of the battery module and other structures.

[0048] Furthermore, if Figure 3 As shown, L1>h2, so that there is a sufficient connection width between the two ends of the second bottom guard plate 3 along the first direction and the two side walls of the groove 21 along the first direction, thereby ensuring the connection reliability between the first bottom guard plate 2 and the second bottom guard plate 3, thereby further improving the structural strength of the box body 10.

[0049] In some embodiments of the present invention, Figure 1-Figure 3As shown, along the direction from the mounting cavity 4 to the groove 21, the two side walls of the groove 21 along the first direction are inclined away from the center of the groove 21, and the two ends of the second bottom guard plate 3 along the first direction are inclined away from the center of the groove 21, and the angles between the two side walls of the groove 21 along the first direction and the bottom wall of the groove 21 are both β, and they are connected by rounded corners. Among the two ends of the second bottom guard plate 3 along the third direction, the angles between the end relatively close to the mounting cavity 4 and the two ends of the second bottom guard plate 3 along the first direction are both β, and they are connected by rounded corners, and the angles between the end relatively far from the mounting cavity 4 and the two ends of the second bottom guard plate 3 along the first direction are both α, and they are connected by rounded corners, 130°≤β≤140°, 40°≤α≤50°, α+β=180°, the outer diameter of the rounded corner is R, R≥3mm, and the first direction, the second direction and the third direction are perpendicular to each other.

[0050] It should be noted that the rounded corners are all protruding away from the center of the groove 21, and the joint is rounded to make the joint more gentle, thereby avoiding the structure near the joint and preventing the joint from damaging the nearby structure.

[0051] It is understandable that if Figure 1-Figure 3 As shown, 130°≤β≤140°, 40°≤α≤50°, α+β=180°, β can be 130°, 135°, 138°, 140°, etc., and α can be 50°, 45°, 42°, 40°, etc. Thus, at both ends of the second bottom guard plate 3 along the third direction, the length along the first direction of the end relatively close to the installation cavity 4 is smaller than the length along the first direction of the end relatively far from the installation cavity 4, so that the structures of the second bottom guard plate 3 and the first bottom guard plate 2 are more stable, so that the first bottom guard plate 2 and the second bottom guard plate 3 can stably support the battery module and other structures.

[0052] Furthermore, if Figure 1-Figure 3 As shown, R ≥ 3 mm, for example, R can be 4 mm, 5 mm, 6 mm or 7 mm, etc., thereby further making the connection more gentle, so as to better avoid the structure near the connection, and also prevent the connection from damaging the nearby structure.

[0053] In some embodiments of the present invention, Figure 1 and Figure 2As shown, the side beam 1 includes a first section 11, a second section 12, a third section 13, a fourth section 14, a fifth section 15, a sixth section 16, a seventh section 17 and an eighth section 18 connected in sequence, the first section 11 is arranged on the side of the third section 13 and the seventh section 17 away from the installation cavity 4 along the first direction, the first section 11 extends along the third direction, one end of the first section 11 is connected to the second section 12, and the other end is connected to the first bottom guard plate 2, the second section 12, the fourth section 14, the eighth section 18 and the sixth section 16 are arranged in sequence in the third direction and extend in the first direction, the second section 12 is located on the side of the sixth section 16 away from the second bottom guard plate 3, the first section 11, the third section 1 3. The fifth section 15 and the seventh section 17 are arranged in the first direction and extend along the third direction. The third section 13 is located on the side of the seventh section 17 away from the second bottom guard plate 3. A second cavity 19 is formed between the first section 11, the second section 12, the third section 13, the sixth section 16 and the seventh section 17. The fourth section 14, the fifth section 15 and the eighth section 18 are all arranged in the second cavity 19. The fourth section 14 divides the second cavity 19 into a first sub-cavity 191 and a second sub-cavity 192. The fifth section 15 is stacked and fitted with the first section 11. The eighth section 18 is stacked and connected with the fourth section 14. The first direction, the second direction and the third direction are perpendicular to each other.

[0054] It can be understood that in a side beam 1, the first section 11 extends along the third direction, one end of the first section 11 is connected to one end of the second section 12, and the other end is connected to one end of the first bottom guard plate 2 along the first direction, the other end of the second section 12 is connected to one end of the third section 13, the other end of the third section 13 is connected to one end of the fourth section 14, the other end of the fourth section 14 is connected to one end of the fifth section 15, the other end of the fifth section 15 is connected to one end of the sixth section 16, the other end of the sixth section 16 is connected to one end of the seventh section 17, the other end of the seventh section 17 is connected to one end of the eighth section 18, and the third section 13 and the seventh section 17 are flush in the first direction. Thus, the first sheet metal part is bent multiple times to form the side beam 1 of the utility model, thereby improving the integrity of the side beam 1, and further improving the structural reliability of the box body 10.

[0055] The fifth section 15 is stacked and fitted with the first section 11, thereby improving the structural strength of the side beam 1 along the first direction. At the same time, the fourth section 14 extends along the first direction and is arranged in the second cavity 19, thereby further improving the structural strength of the side beam 1 along the first direction, thereby improving the structural reliability of the box body 10. At the same time, the eighth section 18 is stacked and connected (welded or bonded) with the fourth section 14, thereby further improving the integrity of the side beam 1.

[0056] In addition, the provision of the second cavity 19 not only reduces the weight of the side beam 1, which is beneficial to the economy and lightness of the box body 10. It can also ensure that when the outer side of the side beam 1 is hit, the outer side of the side beam 1 has a certain deformation space, thereby absorbing the collision energy, thereby reducing the deformation of the inner side of the side beam 1, and better protecting the battery module and other structures. The outer side of the side beam 1 refers to the side of the side beam 1 that is relatively far away from the installation cavity 4 along the first direction, and the inner side of the side beam 1 refers to the side of the side beam 1 that is relatively close to the installation cavity 4 along the first direction.

[0057] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the sixth section 16 is separated from the first bottom guard plate 2 to form a third cavity 5. Thus, the weight of the first bottom guard plate 2 can be reduced to achieve the economy and lightness of the box 10. At the same time, by providing the third cavity 5, the first bottom guard plate 2 has a certain deformation space, so that the first bottom guard plate 2 can absorb the collision energy through a certain deformation, thereby improving the protection of the battery module and other structures.

[0058] Furthermore, if Figure 1-Figure 3 As shown, the height of the third cavity 5 along the third direction is h3, and the height of the first cavity 31 along the third direction is h2, and h3≥h2; thereby, the third cavity 5 has a sufficient height along the third direction, and further the first bottom guard plate 2 has a deformation space, so that the first bottom guard plate 2 can absorb the collision energy through a certain deformation, thereby improving the protection of structures such as the battery module.

[0059] In some embodiments of the present invention, Figure 1-Figure 3 As shown, part of the first bottom guard plate 2 protrudes toward the installation cavity 4 to form a protrusion 22, and the protrusion 22 is arranged corresponding to the groove 21. One end of the protrusion 22 along the first direction and the third direction are connected to the sixth section 16 (such as welding or bonding), and the width of the connection part between one end of the protrusion 22 along the first direction and the sixth section 16 is L2, and the width of the connection part between one end of the protrusion 22 along the third direction and the sixth section 16 is L3. The distance between the end of the second bottom guard plate 3 along the third direction facing the installation cavity 4 and the bottom wall of the groove 21 is h1, and the length of the second cavity 19 along the first direction is L4, L2≥3mm, L2>h1, L3≥L4 / 6.

[0060] It should be noted that the width of the connection portion between one end of the protrusion 22 along the first direction and the sixth section 16 refers to the width along the third direction, and the width of the connection portion between one end of the protrusion 22 along the third direction and the sixth section 16 refers to the width along the first direction.

[0061] It can be understood that one end of the protrusion 22 along the first direction and the third direction is connected to the sixth section 16, thereby improving the connection reliability of the first bottom guard plate 2 and the side beam 1, thereby improving the integrity of the first bottom guard plate 2 and the side beam 1, and further improving the structural strength of the box body 10. Wherein, L2 ≥ 3mm, L2 can be 3mm, 4mm, 5mm, 6mm, etc., thereby, there is a sufficient connection width between one end of the protrusion 22 along the first direction and the sixth section 16, thereby improving the connection reliability between one end of the protrusion 22 along the first direction and the sixth section 16, thereby improving the integrity of the first bottom guard plate 2 and the side beam 1, and thus improving the structural reliability of the box body 10.

[0062] Furthermore, if Figure 3 As shown, L3 ≥ L4 / 6, thereby ensuring that there is a sufficient connection width between one end of the raised portion 22 along the third direction and the sixth section 16, thereby improving the connection reliability between the first bottom guard plate 2 and the side beam 1, thereby improving the integrity of the first bottom guard plate 2 and the side beam 1, and further improving the structural strength of the box body 10.

[0063] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the fourth segment 14 includes a straight segment and a curved segment, there are two curved segments, which are respectively arranged at both ends of the straight segment, the eighth segment 18 is stacked and connected to the straight segment (connected by welding or bonding, etc.), the length of the straight segment is L5, and the width of the connecting part of the eighth segment 18 and the straight segment (the length along the first direction) is L6, 3mm≤L6≤(L5 / 2)mm; wherein L6 can be 3mm, 4mm, 5mm or 6mm, etc.

[0064] It can be understood that the two curved segments are connected to the third segment 13 and the fifth segment 15 respectively, and 3mm≤L6≤(L5 / 2)mm, which not only ensures that there is sufficient connection width between the eighth segment 18 and the straight segment, improves the connection reliability between the eighth segment 18 and the straight segment, but also avoids the width of the connection part between the eighth segment 18 and the straight segment being too long, thereby saving the connection process and the materials required for the connection, improving production efficiency and reducing costs.

[0065] In some embodiments of the present invention, Figure 1-Figure 3 As shown, along the direction from the third section 13 to the first section 11, the fourth section 14 and the eighth section 18 both extend obliquely toward the first bottom guard plate 2, the angle between the fourth section 14 and the third section 13 is β, the angle between the eighth section 18 and the seventh section 17 is α, 130°≤β≤140°, 40°≤α≤50°, α+β=180°. It should be noted that β can be 130°, 135°, 138°, 140°, etc., and α can be 50°, 45°, 42°, 40°, etc.

[0066] It can be understood that along the direction from the third section 13 to the first section 11, the fourth section 14 and the eighth section 18 both extend obliquely toward the first bottom guard plate 2, so that the fourth section 14 and the eighth section 18 can withstand both the collision force from the first direction and the collision force from the third direction, thereby improving the collision performance of the side beam 1 and thus improving the structural strength of the box body 10.

[0067] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the fourth section 14 is connected to the third section 13 by a rounded corner, and the eighth section 18 is connected to the seventh section 17 by a rounded corner, and the outer diameter of the rounded corner is R, R ≥ 3 mm. It can be understood that the above-mentioned rounded corners are all protruding away from the second cavity 19, and the connection between the fourth section 14 and the third section 13 and the connection between the eighth section 18 and the seventh section 17 are rounded, so that the connection is more gentle, thereby avoiding the structure near the connection, and also preventing the connection from damaging the nearby structure.

[0068] Furthermore, if Figure 1-Figure 3 As shown, R ≥ 3 mm, for example, R can be 4 mm, 5 mm, 6 mm or 7 mm, etc., thereby further making the connection between the fourth section 14 and the third section 13 and the connection between the eighth section 18 and the seventh section 17 more gentle, so as to better avoid the structure near the connection and also prevent the connection from damaging the nearby structure.

[0069] In some embodiments of the present invention, the first sheet metal part is a steel plate; it is understandable that the steel plate has higher structural strength and lower cost than the aluminum plate. Therefore, the first sheet metal part is a steel plate, so that the box 10 has higher structural strength and lower cost.

[0070] In some embodiments of the present invention, the second sheet metal part is a steel plate. It is understandable that the steel plate has a higher structural strength and a lower cost than the aluminum plate. Therefore, the second sheet metal part is a steel plate, so that the structural strength of the box body 10 is higher and the cost is lower.

[0071] A battery pack according to an embodiment of the present invention is described below.

[0072] The battery pack according to the embodiment of the present invention includes the box body 10 mentioned above.

[0073] According to the battery pack of the embodiment of the utility model, by setting the above-mentioned box body 10, the first bottom guard plate 2 and the two side beams 1 are bent through the first sheet metal to form an integral part, the first bottom guard plate 2 is partially recessed toward the installation cavity 4 to form a groove 21, the second bottom guard plate 3 is arranged in the groove 21, and the two ends of the second bottom guard plate 3 along the first direction are respectively welded and / or bonded to the two side walls of the groove 21 along the first direction, and the second bottom guard plate 3 is formed through the second sheet metal. Thereby, the integrity of the box body 10 is improved. At the same time, the second bottom guard plate 3 and the first bottom guard plate 2 jointly form a multi-layer bottom guard plate structure, so that the box body 10 is better stressed and has a higher structural strength. At the same time, the setting of fastening holes such as screw holes is also reduced, thereby improving the sealing of the box body 10, reducing air leakage, and improving waterproof and dustproof performance.

[0074] 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0075] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate 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 box, characterized in that: For a battery pack, the box comprises: two side beams, the two side beams being spaced apart in a first direction; A first bottom guard plate, wherein two ends of the first bottom guard plate along the first direction are respectively connected to the two side beams, a mounting cavity is formed between the first bottom guard plate and the two side beams, a portion of the first bottom guard plate is recessed toward the mounting cavity to form a groove, and the first bottom guard plate and the two side beams are formed into an integral part by bending a first sheet metal part; The second bottom guard plate is arranged in the groove, the two ends of the second bottom guard plate along the first direction are respectively welded and / or bonded to the two side walls of the groove along the first direction, and the second bottom guard plate is formed by a second sheet metal part.

2. The box according to claim 1, characterized in that: The second bottom guard plate is an annular column extending along the second direction. The annular column is formed as an integral piece by bending the second sheet metal part. A first cavity is provided inside the annular column. The first cavity extends along the second direction. The first direction and the second direction are perpendicular to each other.

3. The box according to claim 2, characterized in that: One end of the second bottom guard plate along the third direction facing the installation cavity is spaced apart from the bottom wall of the groove, and the first direction, the second direction and the third direction are perpendicular to each other.

4. The box according to claim 3, characterized in that: A buffer is provided between one end of the second bottom guard plate along the third direction facing the installation cavity and the bottom wall of the groove; And / or, a buffer is provided in the first cavity; And / or, the two ends of the second bottom guard plate along the first direction are respectively connected to the two side walls of the groove along the first direction, the width of the connecting part is L1, the distance between one end of the second bottom guard plate along the third direction facing the installation cavity and the bottom wall of the groove is h1, and the height of the first cavity along the third direction is h2, h1≥3mm, L1>h2, h2≥2*h1.

5. The box according to claim 2, characterized in that: Along the direction from the installation cavity to the groove, the two side walls of the groove along the first direction are inclined away from the center of the groove, and the two ends of the second bottom guard plate along the first direction are inclined away from the center of the groove. The angles between the two side walls of the groove along the first direction and the bottom wall of the groove are both β, and they are connected by rounded corners. Among the two ends of the second bottom guard plate along the third direction, the angle between the end relatively close to the installation cavity and the two ends of the second bottom guard plate along the first direction is both β, and they are connected by rounded corners. The angles between the end relatively far from the installation cavity and the two ends of the second bottom guard plate along the first direction are both α, and they are connected by rounded corners. 130°≤β≤140°, 40°≤α≤50°, α+β=180°, the outer diameter of the rounded corner is R, R≥3mm, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The box according to claim 2, characterized in that: The side beam includes a first section, a second section, a third section, a fourth section, a fifth section, a sixth section, a seventh section and an eighth section connected in sequence, the first section is arranged on a side of the third section and the seventh section away from the installation cavity along the first direction, the first section extends along a third direction, one end of the first section is connected to the second section, and the other end is connected to the first bottom guard plate, the second section, the fourth section, the eighth section and the sixth section are arranged in sequence in the third direction and all extend along the first direction, the second section is located on a side of the sixth section away from the second bottom guard plate, the first section, the third section, the fifth section and the seventh section are arranged in the first direction and all extend along the third direction, and the third section is located on a side of the seventh section away from the second bottom guard plate, A second cavity is formed between the first segment, the second segment, the third segment, the sixth segment and the seventh segment, the fourth segment, the fifth segment and the eighth segment are all arranged in the second cavity, the fourth segment divides the second cavity into a first sub-cavity and a second sub-cavity, the fifth segment is stacked and fitted with the first segment, the eighth segment is stacked and connected with the fourth segment, and the first direction, the second direction and the third direction are perpendicular to each other.

7. The box according to claim 6, characterized in that: The sixth section is spaced apart from the first bottom guard plate to form a third cavity, the height of the third cavity along the third direction is h3, the height of the first cavity along the third direction is h2, and h3≥h2; And / or, part of the first bottom guard plate protrudes toward the installation cavity to form a protrusion, and the protrusion is arranged corresponding to the groove, one end of the protrusion along the first direction and the third direction are connected to the sixth section, the width of the connection part between one end of the protrusion along the first direction and the sixth section is L2, the width of the connection part between one end of the protrusion along the third direction and the sixth section is L3, the distance between one end of the second bottom guard plate along the third direction facing the installation cavity and the bottom wall of the groove is h1, and the length of the second cavity along the first direction is L4, L2≥3mm, L2>h1, L3≥L4 / 6.

8. The box according to claim 6, characterized in that: The fourth segment includes a straight segment and a curved segment, the number of the curved segments is two, and the curved segments are respectively arranged at both ends of the straight segment, the eighth segment is stacked and connected with the straight segment, the length of the straight segment is L5, the width of the connecting portion of the eighth segment and the straight segment is L6, 3mm≤L6≤(L5 / 2)mm; And / or, along the direction from the third section to the first section, the fourth section and the eighth section both extend obliquely toward the first bottom guard plate, the angle between the fourth section and the third section is β, the angle between the eighth section and the seventh section is α, 130°≤β≤140°, 40°≤α≤50°, α+β=180°; And / or, the fourth section is connected to the third section via a rounded corner, the eighth section is connected to the seventh section via a rounded corner, and the outer diameter of the rounded corner is R, R≥3 mm.

9. The box according to claim 1, characterized in that: The first sheet metal component is a steel plate; and / or the second sheet metal component is a steel plate.

10. A battery pack, characterized in that: Comprising a box according to any one of claims 1-9.

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