Battery box and battery device

Abstract

The invention provides a battery box and a battery device.The battery box comprises a bottom plate and a frame arranged on the edge of the bottom plate, the bottom plate and the frame are integrally formed and define a containing space for containing a battery, the frame comprises two oppositely-arranged side edge beams and two oppositely-arranged end edge beams, the side edge beams form a cavity after being bent, and the end edge beams are arranged in the cavity after being bent. The end edge beams are of a single-layer plate-shaped structure, the adjacent end edge beams and side edge beams are connected in a welded mode, in the arrangement direction of the two side edge beams, each side edge beam comprises a first edge and a second edge, the first edge is close to the containing space, the second edge is away from the containing space, and the end edge beams are welded to the first edges or the second edges of the side edge beams. During processing, only the adjacent side part edge beams and end part edge beams need to be welded, so that the number of connecting welding seams of the battery box is small, the length of the welding seams is relatively short, and the sealing performance in the battery box can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary batteries, and in particular to a battery box and a battery device. Background Art

[0002] The battery pack is a core component of new energy vehicles. The battery pack includes a battery box, which includes a bottom plate and a frame. The bottom plate and the frame enclose a storage space for accommodating the battery. In the prior art, the battery box is usually formed by welding profiles at the edge of the plate to form a box structure. However, in this type of battery box, the profiles and the plate need to be welded together, and the adjacent profiles need to be welded together. Therefore, there are many overall connection welds, making it difficult to ensure the sealing performance of the battery box. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the battery box in the prior art has many welds and it is difficult to ensure the sealing performance, thereby providing a battery box and a battery device.

[0004] In order to solve the above problems, the present invention provides a battery box, including a bottom plate and a frame arranged at the edge of the bottom plate, the bottom plate and the frame are formed as one piece, and surround a storage space for accommodating batteries, the frame includes two oppositely arranged side beams and two oppositely arranged end side beams, the side beams are formed by bending to form a cavity, the end side beams are a single-layer plate structure, and adjacent end side beams and side beams are connected by welding, and along the arrangement direction of the two side beams, the side beams include a first side and a second side, the first side is close to the storage space, and the second side is away from the storage space, wherein the end side beam is welded to the first side of the side beam close to the storage space; and / or the end side beam is welded to the second side of the side beam away from the storage space.

[0005] The present invention has the following advantages: Utilizing the technical solution of the present invention, the battery box includes a bottom plate and a frame, and the bottom plate and the frame are integrally formed. The frame includes side beams and end beams, and the side beams are bent to form a cavity to ensure the structural strength of the battery box, and the end beams are single-layer plate structures. During processing, only the adjacent side beams and end beams need to be welded, so the battery box has a small number of connecting welds and a short length of welds, which is beneficial to ensure the sealing performance in the battery box. Therefore, the technical solution of the present invention solves the defect that the battery box in the prior art has a large number of welds and it is difficult to ensure the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0007] Figure 1 A schematic structural diagram of a battery box of the present invention is shown; Figure 2 Shows Figure 1 A schematic diagram of the connection between the side beams and the end beams of the middle battery box; Figure 3 Shows Figure 1 A schematic diagram of the structure of the cavity of the battery box; Figure 4 It's out Figure 1 A schematic diagram of a structure in which the height of the cavity of the middle battery box is less than the height of the side beam; Figure 5 Shows Figure 1 Schematic diagram of the connection between the side beam of the middle battery box and the first reinforcing beam; Figure 6 Shows Figure 1 A schematic diagram of the structure of the end side beams of the middle battery box; Figure 7 Shows Figure 1 A schematic diagram of the connection between the side beams and the end beams of the middle battery box from a bottom perspective; Description of reference numerals: 10. Bottom plate; 20. Frame; 21. Side beam; 211. First side; 212. Second side; 22. End beam; 221. First flange; 222. Second flange; 2221. Through hole; 223. Third flange; 30. Cavity; 301. Folded edge; 302. Cavity body; 303. Tail end; 31. First sub-cavity; 32. Second sub-cavity; 40. First weld; 50. First reinforcing beam; 60. Second weld; 70. Third weld; 80. First arc-shaped transition section; 90. Second arc-shaped transition section. DETAILED DESCRIPTION

[0008] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0009] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0010] 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.

[0011] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0012] like Figure 1 and Figure 2 As shown, an embodiment of a battery box according to the present application includes a bottom plate 10 and a frame 20 arranged at the edge of the bottom plate 10. The bottom plate 10 and the frame 20 are integrally formed and enclose a storage space for accommodating batteries, and the frame 20 includes two oppositely arranged side beams 21 and two oppositely arranged end beams 22. The side beams 21 are bent to form a cavity 30, and the end beams 22 are single-layer plate structures, and adjacent end beams 22 and side beams 21 are connected by welding.

[0013] Using the technical solution of this embodiment, the battery box includes a bottom plate 10 and a frame 20, and the bottom plate 10 and the frame 20 are integrally formed. The frame 20 includes a side beam 21 and an end beam 22. The side beam 21 is bent to form a cavity 30, thereby ensuring the structural strength of the battery box. The end beam 22 is a single-layer plate structure. During processing, it is only necessary to weld the adjacent side beams 21 and the end beams 22. Therefore, the battery box has a small number of connecting welds and a short length of the welds, which is conducive to ensuring the sealing performance in the battery box. Therefore, the technical solution of this embodiment solves the defect that the battery box in the prior art has a large number of welds and it is difficult to ensure the sealing performance.

[0014] It should be noted that the above-mentioned “single-layer plate-like structure” means that the end side beam 22 does not have a cavity, and is a plate-like structure, or can be called an end plate.

[0015] Combination Figure 1 and Figure 2 It can be seen that in the battery box of this embodiment, the junction between the side edge beam 21 and the bottom plate 10, as well as the junction between the end edge beam 22 and the bottom plate 10 are both integral structures, so these two junctions do not need to be connected by welding, thereby ensuring the sealing performance of the two junctions.

[0016] Furthermore, the heights of the side beams 21 and the end beams 22 are relatively low, so the length of the welds at the connection positions of the side beams 21 and the end beams 22 is relatively short, which is also beneficial to ensuring the sealing performance at the side beams 21 and the end beams 22 .

[0017] Furthermore, in this embodiment, a cavity 30 is provided on a pair of side beams 21, and the cavity 30 can ensure the structural strength of the battery box side. The other pair of end beams 22 is a single-layer plate structure, so it can be fixed to the side beams 21 through a single weld, thereby reducing the number of welding times, while ensuring strength, and also improving the sealing performance. At the same time, since the end beams 22 are a single-layer plate structure, the internal space of the box is guaranteed, and the space utilization rate inside the box is improved.

[0018] like Figure 2 As shown, in the technical solution of this embodiment, the end side beam 22 is welded to the first side 211 of the side side beam 21 close to the accommodating space.

[0019] Specifically, Figure 2 Take the content shown as an example, Figure 2 The side of the side beam 21 shown in the figure close to the accommodation space refers to the right side thereof, i.e. Figure 2 The first side 211 is shown in FIG.

[0020] By such arrangement, after the end side beam 22 is welded to the side side beam 21, the end side beam 22 does not cover the cavity 30, which can prevent welding slag from falling into the cavity 30 during welding, and also facilitate the cleaning of foreign matter such as welding slag from the cavity 30, thereby reducing the risk of foreign matter entering the battery pack.

[0021] In an embodiment not shown, the end side beam 22 may also be welded to the second side 212 of the side side beam 21 away from the accommodating space.

[0022] by Figure 2 The end side beam 22 can also be extended so that the end side beam 22 and the Figure 2 The side beam 21 shown is located away from the receiving space, that is, Figure 2 The second edge 212 is shown welded.

[0023] Such arrangement enables the end side beam 22 and the side side beam 21 to wrap around the cavity 30 after being welded. The cavity 30 is a closed cavity and exists inside the battery box. Therefore, the cavity 30 can be used as an exhaust channel to facilitate exhaust when the battery box has thermal runaway.

[0024] like Figure 3 As shown, in the technical solution of this embodiment, along the arrangement direction of the two side beams 21, the ratio of the width a of the cavity 30 to the thickness b of the plate of the side beam 21 is in the range of 15 to 30.

[0025] First of all, it should be noted that the "ratio of the width a of the cavity 30 to the thickness b of the plate of the side beam 21" in this embodiment refers to the value of the former to the latter, that is, the value of a / b. Other similar expressions in this article have this meaning and will not be repeated later.

[0026] It should be noted that the width a of the cavity 30 refers to Figure 3 Furthermore, the greater the thickness b of the plate of the side beam 21 is, the higher the strength of the side beam 21 is, so the requirement for the width a of the cavity 30 can be appropriately smaller, thereby increasing the capacity of the battery box.

[0027] Furthermore, when a and b are within a suitable range, the strength and sealing of the side beams 21 of the box body can be ensured while ensuring the light weight of the battery box. When the plate thickness b of the side beam 21 is large, the width a of the cavity 30 in the side beam 21 needs to be supplemented by a certain value. However, the width a of the cavity 30 needs to take a reasonable value. If the width b of the cavity 30 is too wide, the cavity 30 occupies a large volume of the box body, affecting the number of batteries placed, thereby reducing the energy density of the box body; if the width a of the cavity 30 is too small, on the one hand, the strength of the side beam 21 will be reduced, and on the other hand, because the width a is too small, the plane between the top of the cavity 30 and the sealing surface of the box cover is narrow, and sealing is more difficult, so the sealing is poor.

[0028] Optionally, the ratio of the width a of the cavity 30 to the thickness b of the plate of the side edge beam 21 can be selected from 15, 20, 25 or 30, etc. and any value between the two values.

[0029] Further, the width a of the cavity 30 is in the range of 22 mm to 35 mm.

[0030] For example, the width a of the cavity 30 may be selected to be 22 mm, 24 mm, 28 mm, 30 mm, 32 mm, 35 mm, etc., and any value between two values.

[0031] Preferably, the width a of the cavity 30 is 25 mm.

[0032] Further, the thickness b of the plate material of the side rail 21 is in the range of 0.8 mm to 2 mm.

[0033] For example, the thickness b of the plate material of the side edge beam 21 can be selected to be 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, etc., and any value between two values.

[0034] Preferably, the thickness b of the plate material of the side edge beam 21 is 1.2 mm.

[0035] like Figure 1 and Figure 3 As shown, in the technical solution of this embodiment, along the arrangement direction of the two side beams 21, the ratio of the width a of the cavity 30 to the length c of the side beams 21 is in the range of 15 to 125.

[0036] Specifically, the longer the length c of the side beam 21 is, the wider the width a of the corresponding cavity 30 is, the easier it is to seal, and the better the sealing performance of the battery box is.

[0037] For example, the ratio of the width of the cavity 30 to the length of the side rail 21 may be 15, 30, 50, 100, or 125, etc., and any value between the two values.

[0038] Further, the length c of the side beam 21 is in the range of 500 mm to 2500 mm.

[0039] For example, the length c of the side beam 21 can be selected to be 500 mm, 700 mm, 1000 mm, 1500 mm, 2000 mm or 2500 mm, etc., and any value between two values.

[0040] Preferably, the length c of the side beam 21 is 2000 mm.

[0041] like Figure 3 As shown, in the technical solution of this embodiment, the ratio of the height h1 of the cavity 30 to the height h2 of the side beam 21 is in the range of 0.1 to 1.

[0042] The height direction is a direction perpendicular to the plane where the bottom plate 10 is located.

[0043] Specifically, if the height h1 of the cavity 30 is too low, it will not strengthen the side beam 21, or the strengthening effect will be limited. However, if the height h1 of the cavity 30 is too high, the cavity 30 will occupy a larger volume, which will affect the volume energy density of the battery box.

[0044] Figure 3The figure shows a situation where the height h1 of the cavity 30 is substantially the same as the height h2 of the side beam 21 (there is a difference of two profile thicknesses between the two).

[0045] Figure 4 The case where the height h1 of the cavity 30 is lower than the height h2 of the side rail 21 is shown.

[0046] For example, the ratio of the height h1 of the cavity 30 to the height h2 of the side rail 21 may be selected to be 0.1, 0.3, 0.5, 0.7 or 1, etc., and any value between the two values.

[0047] Optionally, the height h1 of the cavity 30 ranges from 15 mm to 150 mm.

[0048] For example, the height h1 of the cavity 30 may be selected to be 15 mm, 30 mm, 50 mm, 70 mm, 100 mm, or 150 mm, etc., and any value between the two values.

[0049] Optionally, the height h2 of the side rail 21 ranges from 30 mm to 150 mm.

[0050] For example, the height h2 of the side beam 21 can be selected to be 30 mm, 50 mm, 70 mm, 100 mm, 150 mm, etc., and any value between the two values.

[0051] like Figure 4 As shown, in the technical solution of this embodiment, the cavity 30 includes a first sub-cavity 31 and a second sub-cavity 32 arranged along a direction perpendicular to the base plate 10, the first sub-cavity 31 is located on the side of the second sub-cavity 32 away from the base plate 10, and along the direction perpendicular to the base plate 10, the ratio of the height h11 of the second sub-cavity 32 to the height h1 of the cavity 30 is in the range of 0.05 to 0.95.

[0052] Specifically, from Figure 3 It can be seen that two layers of plates are arranged at the position of the corresponding side beam 21 at the second sub-cavity 32. Therefore, the larger the proportion of the height h11 of the second sub-cavity 32, the larger the proportion of the two layers of plates, and the higher the strength of the side beam 21. The proportion of the height h11 of the second sub-cavity 32 cannot be too large, otherwise the battery box will be too heavy.

[0053] For example, the ratio of the height of the second sub-cavity 32 to the height h1 of the h11 cavity 30 can be selected as 0.05, 0.1, 0.3, 0.5, 0.7, 0.9 or 0.95, etc., and any value between the two values.

[0054] The height h11 of the second sub-cavity 32 is in the range of 10 mm to 140 mm.

[0055] For example, the height h11 of the second sub-cavity 32 can be selected as 10 mm, 20 mm, 50 mm, 70 mm, 100 mm or 140 mm, etc., and any value between the two values.

[0056] like Figure 3 As shown, in the technical solution of this embodiment, on the side of the second sub-cavity 32 close to the accommodating space, at least two layers of plates are included between the second sub-cavity 32 and the accommodating space, and the two adjacent layers of plates are welded and fixed.

[0057] Such an arrangement can further improve the strength of the cavity 30 .

[0058] In this embodiment, two layers of plates are included between the second sub-cavity 32 and the accommodation space. Of course, in some embodiments not shown, more than two layers of plates may also be included between the second sub-cavity 32 and the accommodation space.

[0059] In addition, in this embodiment, three methods can be used to weld the two layers of plate materials.

[0060] The first one is that welding can be performed between the two bottom plates. This welding process is relatively convenient to implement, but the disadvantage is that the strength is relatively weak. The second method is to perform penetration welding on the side of the box body. This method has a higher welding strength, but the weld will leave a weld mark on the inner surface of the side beam 21 facing the box body, affecting the installation of the battery. The third method is to perform welding inside the cavity 30 , which has a higher strength, but the welding process is difficult to implement.

[0061] In this embodiment, the second method is preferably used to weld the two layers of plate materials.

[0062] like Figure 3 As shown, in the technical solution of this embodiment, the relationship between the weld width d1 of the two adjacent layers of plate and the ratio of the height h11 of the second sub-cavity 32 to the height h1 of the cavity 30 satisfies the following relationship: 3≤d1 / (h11 / h1)≤20.

[0063] Specifically, the higher the height h11 of the second sub-cavity 32 is, the larger the surface that needs to be fixed by welding is, and the larger the total weld width d1 is required to be, so as to improve the fixing effect of the second sub-cavity 30 .

[0064] For example, the weld width d1 of the two layers of plate, the height h11 of the second sub-cavity 32 and the height h1 of the cavity 30 can be 3, 5, 10, 15 or 20 and any value in between based on the above relationship.

[0065] like Figure 3 As shown, in the technical solution of this embodiment, the mold cavity 30 includes a folded edge 301, and the folded edge 301 is integrally formed with the bottom plate 10. The mold cavity 30 is connected to the folded edge 301, and the mold cavity 30 is located on the side of the folded edge 301 away from the bottom plate 10.

[0066] With this arrangement, the side edge beam 21 is rolled outward, which facilitates the rolling process and improves production efficiency.

[0067] The following combination Figure 3 The molding method of the cavity 30 in this embodiment is described in detail.

[0068] 1. The side beam 21 is bent in a direction perpendicular to the bottom plate 10, that is, a folded edge 301 is formed; 2. The side beam 21 is bent horizontally toward the outside; 3. The side beam 21 is bent vertically downward; 4. The side beam 21 is bent horizontally inward to enclose a first sub-cavity 31; 5. The side beam 21 is bent vertically downward and fits with the folded edge 301 (welded connection); 6. The side beam 21 is bent horizontally toward the outside; 7. The side beam 21 is bent vertically upward to enclose a second sub-cavity 32; 8. The side beam 21 is bent horizontally inward, and the bent portion is connected to the lower side of the first sub-cavity 31 .

[0069] like Figure 3 and Figure 5 As shown, in the technical solution of this embodiment, the cavity 30 includes a cavity body 302 and a tail end 303, the tail end 303 is fixedly connected to the cavity body 302 by a first weld 40, and the extension length d2 of the tail end 303 is in the range of 2 mm to 10 mm.

[0070] Combination Figure 3 Those skilled in the art can understand that the above steps 1 to 7 form the cavity body 302 , and the above step 8 forms the tail end 303 .

[0071] Further, from Figure 3 It can be seen that the extension length d2 of the tail end 303 does not include the transitional arc region.

[0072] Furthermore, if the extension length of the tail end 303 is too long, the rolling process is difficult to implement, and the tail end 303 cannot be well fitted with the inner wall of the cavity 30. If the extension length of the tail end 303 is too short, the fixing strength between the tail end 303 and the cavity body 302 is weak, so that the strength of the entire side beam 21 is low.

[0073] For example, the extension length d2 of the tail end 303 can be selected to be 2 mm, 4 mm, 6 mm, 8 mm, or 10 mm, etc., and any value between two values.

[0074] like Figure 5 As shown, in the technical solution of this embodiment, the battery box further includes a first reinforcing beam 50, which is arranged on the outside of the side beam 21, that is, on the side of the side beam 21 away from the accommodation space. The first reinforcing beam 50 is welded and fixed to the side beam 21 through the second weld 60 and the third weld 70, and the first weld 40 is spaced from the second weld 60 and the third weld 70.

[0075] Specifically, the first reinforcing beam 50 is disposed in parallel with the side edge beam 21 and is located outside the side edge beam 21 .

[0076] Such an arrangement avoids the situation where the first weld 40 , the second weld 60 , and the third weld 70 overlap, causing the first weld 40 to fail.

[0077] like Figure 5 As shown, in the technical solution of this embodiment, the second weld 60 and the third weld 70 are respectively located on both sides of the first weld 40. Figure 5 In the illustrated content, the second weld seam 60 is located outside the first sub-cavity 31 , and the third weld seam 70 is located outside the second sub-cavity 32 .

[0078] In an embodiment not shown, the second weld 60 and the third weld 70 may also be located on one side of the first weld 40. For example, the second weld 60 and the third weld 70 may also be located outside the first sub-cavity 31, or the second weld 60 and the third weld 70 may also be located outside the second sub-cavity 32.

[0079] Further, a ratio of a distance d3 between the first weld 40 and the second weld 60 or the third weld 70 to a height h1 of the cavity is in a range of 0.2 to 0.5.

[0080] For example, the ratio of the distance d3 between the first weld 40 and the second weld 60 or the third weld 70 to the height h1 of the cavity can be selected as 0.2, 0.3, 0.4 or 0.5, etc., and any value between the two values.

[0081] Further, a distance d3 between the first weld 40 and the second weld 60 or the third weld 70 is in the range of 7 mm to 68 mm.

[0082] For example, the distance d3 between the first weld 40 and the second weld 60 or the third weld 70 can be selected as 7 mm, 10 mm, 20 mm, 50 mm, 60 mm or 68 mm, etc., and any value between the two values.

[0083] Such a configuration can further avoid the situation where the first weld 40 , the second weld 60 , and the third weld 70 overlap, causing the first weld 40 to fail.

[0084] like Figure 6 As shown, in the technical solution of this embodiment, the end side beam 22 includes a first flange 221 and a second flange 222. The first flange 221 and the second flange 222 are welded and fixed to the side side beam 21, wherein one end of the first flange 221 is connected to the bottom plate 10, and the other end of the first flange 221 is connected to the second flange 222, and the extension direction of the second flange 222 is parallel to the plane where the bottom plate 10 is located. In the arrangement direction of the two end side beams 22, the ratio of the width d4 of the second flange 222 to the width a of the cavity 30 is in the range of 1 to 3.

[0085] Further, when the end side beam 22 is provided with the first flange 221 and the second flange 222 , the end side beam 22 is welded to the first side 211 of the side side beam 21 close to the accommodating space.

[0086] Specifically, if the width d4 of the second flange 222 is too small relative to the width a of the cavity 30, the box cover cannot be sealed when it is closed on the box body. If the width d4 of the second flange 222 is too large relative to the width a of the cavity 30, the internal space of the box body will be compressed, reducing the volume energy density of the box body.

[0087] For example, the ratio of the width d4 of the second flange 222 to the width a of the cavity 30 can be selected as 1, 1.5, 2, 2.5, 3, etc., and any value between the two values.

[0088] Optionally, the width d4 of the second flange 222 is in the range of 25 mm to 50 mm.

[0089] For example, the width d4 of the second flange 222 may be in the range of 25 mm, 305 mm, 355 mm, 405 mm, 455 mm or 50 mm.

[0090] like Figure 2 and Figure 6As shown, in the technical solution of this embodiment, the end side beam 22 further includes a third flange 223. The third flange 223 is connected to the second flange 222, and the extension direction of the second flange 222 is perpendicular to the plane where the bottom plate 10 is located, and the ratio of the extension length d5 ​​of the third flange 223 to the height d6 of the first flange 221 is in the range of 0.015 to 1.

[0091] from Figure 6 It can be seen that the extension length of the third flange 223 includes an arc-shaped transition area.

[0092] Specifically, the greater the proportion of the extension length d5 ​​of the third flange 223 to the height d6 of the first flange 221, the higher the strength of the end side beam 22. However, if the proportion of the extension length d5 ​​of the third flange 223 to the height d6 of the first flange 221 is too large, the third flange 223 will interfere more with the interior of the box and affect the bending process during the bending process. The smaller the proportion of the extension length d5 ​​of the third flange 223 to the height d6 of the first flange 221, the lower the strength of the end side beam 22.

[0093] For example, the ratio of the extension length of the third flange 223 to the height of the first flange 221 can be selected as 0.015, 0.05, 0.1, 0.3, 0.6, 0.9 or 1, etc., and any value between the two values.

[0094] Furthermore, an extension length d5 ​​of the third flange 223 is in the range of 3 mm to 150 mm.

[0095] Optionally, the extension length d5 ​​of the third flange 223 can be selected to be 3 mm, 10 mm, 20 mm, 50 mm, 10 mm or 150 mm, etc., and any value between two values.

[0096] Further, from Figure 6 It can be seen that a through hole 2221 is provided on the second flange 222 , and the ratio of the distance d7 between the through hole 2221 and the welding line between the end side beam 22 and the side side beam 21 and the diameter d8 of the through hole 2221 is in the range of 1 to 15.

[0097] Specifically, the through hole can be used to connect with the box cover of the battery box.

[0098] If the distance between the through hole 2221 and the welding line is too close, the strength of the end side beam 22 will decrease, and when the box cover is fixed, the weld will have a greater impact on the flatness, affecting the sealing. If the distance between the through hole 2221 and the welding line is too far, the downward pressure of the box cover at the welding point is insufficient, which will also affect the sealing of the box cover.

[0099] For example, the ratio of the distance d7 between the through hole 2221 and the welding line between the end side beam 22 and the side side beam 21 to the diameter d8 of the through hole 2221 can be selected as 1, 3, 5, 10, 13 or 15, etc., and any value between the two values.

[0100] Furthermore, if Figure 6 As shown, when the second flange 222 is welded to the side beam 21, the product of the weld width d10 and the width d4 of the second flange 222 is 70 mm. 2 Up to 220mm 2 range.

[0101] Specifically, the wider the width d4 of the second flange 222 is, the smaller the width d10 of the weld can be, and good fixing strength can be achieved. If the width d4 of the second flange 222 is narrower, the width d10 of the weld needs to be appropriately increased to meet strength requirements.

[0102] For example, the product of the weld width and the width of the second flange 222 can be selected as 70 mm. 2 , 100 mm 2 , 150 mm 2 , 200 mm 2 or 220 mm 2 And so on and any value between the two values.

[0103] Furthermore, the width d10 of the weld is in the range of 2 mm to 10 mm.

[0104] For example, the value of the width d10 of the weld seam can be selected as 2, 4, 6, 8 or 10, etc., and any value between two values.

[0105] Furthermore, when the second flange 222 is welded to the side rail 21, the product of the weld width d10 and the thickness d9 of the second flange 222 is 3.2 mm. 2 Up to 10.5mm 2 within the range.

[0106] It should be noted that the thickness d9 of the second flange 222 refers to the thickness of the material at the location of the second flange 222 .

[0107] Specifically, the thicker the thickness d9 of the second flange 222 is, the smaller the width d10 of the weld can be, and good fixing strength can be achieved. If the thickness d9 of the second flange 222 is smaller, the width d10 of the weld needs to be appropriately increased to meet strength requirements.

[0108] For example, the product of the weld width d10 and the thickness d9 of the second flange 222 can be selected as 3.2 mm. 2 , 4mm 2、6mm 2 , 8mm 2 , 10mm 2 or 10.5mm 2 And so on and any value between the two values.

[0109] Further, the thickness d9 of the second flange 222 is in the range of 0.8 mm to 2.0 mm.

[0110] For example, the thickness d9 of the second flange 222 can be selected to be 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, etc., and any value between two values.

[0111] Optionally, the bottom plate 10 and the frame 20 in this embodiment are both made of stainless steel, and the tensile strength of the bottom plate 10 and the frame 20 is in the range of 590 MPa to 1180 MPa.

[0112] For example, the tensile strength of the base plate 10 and the frame 20 can be selected as 590 MPa, 600 MPa, 800 MPa, 1000 MPa, 1100 MPa or 1180 MPa, etc., and any value between two numerical values.

[0113] In the technical solution of this embodiment, the battery box further includes a second reinforcing beam, which is arranged on the inner side of the frame 20, and the extension direction of the second reinforcing beam is parallel to the arrangement direction of the two side beams 21, that is, the extension direction of the second reinforcing beam is the same as that of the end beam 22. Specifically, the second reinforcing beam can further strengthen the structural strength of the side beam 21.

[0114] like Figure 7 As shown, in the technical solution of this embodiment, the side edge beam 21 is connected to the bottom plate 10 through the first arc transition section 80, and the end edge beam 22 is connected to the bottom plate 10 through the second arc transition section 90. The first arc transition section 80 is spaced apart from the end edge beam 22 and has a first spacing, and the second arc transition section 90 is spaced apart from the side edge beam 21 and has a second spacing, and the second spacing is smaller than the first spacing.

[0115] Specifically, by making the second spacing smaller than the first spacing, the hanging distance of the side edge beam 21 is shortened, so that the structural strength of the side edge beam 21 can be further improved.

[0116] Furthermore, the gap formed by the end of the first arc-shaped transition section 80 and the end of the second arc-shaped transition section 90 will be filled by welding in subsequent processing.

[0117] The present application also provides a battery device. According to an embodiment of the battery device of the present application, the battery device includes a battery box, a box cover, and a battery pack. The battery box is the above-mentioned battery box, the box cover is arranged on the battery box, and the box cover is connected to the side edge beam 21 and the end edge beam 22. The battery pack is arranged in the accommodation space of the battery box.

[0118] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery box, characterized in that: The invention comprises a bottom plate (10) and a frame (20) arranged at the edge of the bottom plate (10); the bottom plate (10) and the frame (20) are integrally formed and enclose a storage space for accommodating a battery; the frame (20) comprises two oppositely arranged side beams (21) and two oppositely arranged end beams (22); the side beams (21) are bent to form a cavity (30); the end beams (22) are single-layer plate-shaped structures; adjacent end beams (22) and side beams (21) are connected by welding; In the arrangement direction of the two side edge beams (21), the side edge beam (21) comprises a first side (211) and a second side (212), the first side (211) being close to the accommodation space, and the second side (212) being far from the accommodation space. The end side beam (22) is welded to a first side (211) of the side side beam (21) close to the accommodating space; and / or the end side beam (22) is welded to a second side (212) of the side side beam (21) away from the accommodating space.

2. The battery box according to claim 1, characterized in that: In the arrangement direction along the two side edge beams (21), the ratio of the width (a) of the cavity (30) to the thickness (b) of the plate of the side edge beam (21) is in the range of 15 to 30.

3. The battery box according to claim 1, characterized in that: In the arrangement direction of the two side edge beams (21), the ratio of the width (a) of the cavity (30) to the length (c) of the side edge beam (21) is in the range of 15 to 125.

4. The battery box according to claim 1, characterized in that: The direction perpendicular to the plane where the bottom plate (10) is located is the height direction, and along the height direction, the ratio of the height (h1) of the cavity (30) to the height (h2) of the side edge beam (21) is in the range of 0.1 to 1.

5. The battery box according to claim 4, characterized in that: The mold cavity (30) comprises a first sub-mold cavity (31) and a second sub-mold cavity (32) arranged in a direction perpendicular to the bottom plate (10); the first sub-mold cavity (31) is located on a side of the second sub-mold cavity (32) away from the bottom plate (10); and along the height direction, a ratio of a height (h11) of the second sub-mold cavity (32) to a height (h1) of the mold cavity (30) is in a range of 0.05 to 0.

95.

6. The battery box according to claim 5, characterized in that: On a side of the second sub-cavity (32) close to the accommodating space, at least two layers of plate materials are included between the second sub-cavity (32) and the accommodating space, and two adjacent layers of plate materials are welded and fixed.

7. The battery box according to claim 6, characterized in that: The relationship between the width (d1) of the weld between the two adjacent layers of plate materials, the ratio of the height (h11) of the second sub-cavity (32) to the height (h1) of the cavity (30) satisfies the following relationship: 3≤d1 / (h11 / h1)≤20, The width (d1) of the weld between the two adjacent layers of plate materials is in the range of 1 mm to 6 mm.

8. The battery box according to claim 1, characterized in that: The mold cavity (30) comprises a folded edge (301), the folded edge (301) and the bottom plate (10) are integrally formed, the mold cavity (30) is connected to the folded edge (301), and the mold cavity (30) is located on a side of the folded edge (301) away from the bottom plate (10).

9. The battery box according to claim 1, characterized in that: The mold cavity (30) comprises a mold cavity body (302) and a tail end (303); the tail end (303) is fixedly connected to the mold cavity body (302) via a first weld (40); and an extension length (d2) of the tail end (303) is in the range of 2 mm to 10 mm.

10. The battery box according to claim 9, characterized in that: The battery box further comprises a first reinforcing beam (50), the first reinforcing beam (50) being arranged on a side of the side edge beam (21) away from the accommodation space, the first reinforcing beam (50) being welded and fixed to the side edge beam (21) via a second weld (60) and a third weld (70), and the first weld (40) being spaced from the second weld (60) and the third weld (70).

11. The battery box according to claim 10, characterized in that: The second weld (60) and the third weld (70) are respectively located on both sides of the first weld (40), or the second weld (60) and the third weld (70) are both located on one side of the first weld (40).

12. The battery box according to claim 10, characterized in that: The ratio of the distance (d3) between the first weld (40) and the second weld (60) or the third weld (70) to the height (h1) of the cavity (30) is in the range of 0.2 to 0.

5.

13. The battery box according to claim 1, characterized in that: The end side beam (22) is welded to a first side (211) of the side side beam (21) close to the accommodating space, and the end side beam (22) comprises a first flange (221) and a second flange (222), and the first flange (221) and the second flange (222) are welded and fixed to the side side beam (21), wherein one end of the first flange (221) is connected to the bottom plate (10), and the other end of the first flange (221) is connected to the second flange (222), and an extension direction of the second flange (222) is parallel to a plane where the bottom plate (10) is located, and along the arrangement direction of the two end side beams (22), a ratio of a width (d4) of the second flange (222) to a width (a) of the cavity (30) is in a range of 1 to 3.

14. The battery box according to claim 13, characterized in that: The end side beam (22) further comprises a third flange (223), the third flange (223) being connected to the second flange (222), and the extension direction of the second flange (222) being perpendicular to the plane where the bottom plate (10) is located, and the ratio of the extension length (d5) of the third flange (223) to the height (d6) of the first flange (221) is in the range of 0.015 to 1.

15. The battery box according to claim 13, characterized in that: The second flange (222) is provided with a through hole (2221), and the ratio of the distance (d7) between the through hole (2221) and the welding line between the end side beam (22) and the side side beam (21) to the diameter (d8) of the through hole (2221) is in the range of 1 to 15.

16. The battery box according to claim 13, characterized in that: When the second flange (222) is welded to the side edge beam (21), the product of the weld width (d10) and the width (d4) of the second flange (222) is within 70 mm. 2 Up to 220mm 2 within the range.

17. The battery box according to claim 13, characterized in that: When the second flange (222) is welded to the side edge beam (21), the product of the weld width (d10) and the thickness (d9) of the second flange (222) is within 3.2 mm. 2 Up to 10.5mm 2 within the range.

18. The battery box according to claim 1, characterized in that: The base plate (10) and the frame (20) are both made of stainless steel, and the tensile strength of the base plate (10) and the frame (20) is in the range of 590 MPa to 1180 MPa.

19. The battery box according to claim 1, characterized in that: The battery box also includes a second reinforcing beam, which is arranged on the inner side of the frame (20), and the extension direction of the second reinforcing beam is parallel to the arrangement direction of the two side beams (21).

20. The battery box according to claim 1, characterized in that: The side edge beam (21) is connected to the bottom plate (10) via a first arc-shaped transition section (80), and the end edge beam (22) is connected to the bottom plate (10) via a second arc-shaped transition section (90), the first arc-shaped transition section (80) and the end edge beam (22) are spaced apart and have a first spacing, the second arc-shaped transition section (90) and the side edge beam (21) are spaced apart and have a second spacing, and the second spacing is smaller than the first spacing.

21. A battery device, characterized in that: It comprises a battery box as claimed in any one of claims 1 to 20, a box cover arranged on the battery box, and a battery pack arranged in a receiving space, wherein the box cover is connected to the side edge beam (21) and the end edge beam (22).

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