Expansion beam, battery box and battery

Abstract

The utility model discloses an expansion beam, a battery box and a battery, and belongs to the technical field of batteries. The expansion beam comprises a main beam body; the reinforcing beam body is connected with the main beam body and forms a first buffer cavity, a second buffer cavity and a third buffer cavity which are distributed in the height direction of the expansion beam, the cross section of the first buffer cavity and the cross section of the third buffer cavity are triangular, the cross section of the second buffer cavity is a trapezoid with the lower bottom located on the main beam body, and the cross section of the third buffer cavity is a trapezoid with the lower bottom located on the main beam body. The ratio a of the upper bottom to the lower bottom of the trapezoid is larger than or equal to 0.55 and smaller than or equal to 0.65. By means of the structure, the section moment of the expansion beam is optimized, the bending resistance of the expansion beam is improved, and therefore the service life of the expansion beam is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to an expansion beam, a battery box, and a battery. Background Art

[0002] In the design of battery boxes, the expansion beam is a key structure for coping with the expansion of battery cells. The cross-section of the traditional expansion beam is in the shape of a "mu" character. In practical applications, the section moment of this structure of the expansion beam is relatively low, resulting in insufficient bending resistance and being unable to effectively cope with the stress caused by the expansion of the battery cells. Summary of the Utility Model

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application proposes an expansion beam, a battery box, and a battery, which optimize the section moment of the expansion beam, improve the bending resistance of the expansion beam, and thus extend the service life of the expansion beam.

[0004] In a first aspect, this application provides an expansion beam applied to a battery box, including:

[0005] A main beam body;

[0006] A reinforcing beam body, connected to the main beam body and forming a first buffer cavity, a second buffer cavity, and a third buffer cavity distributed along the height direction of the expansion beam. The cross-sections of the first buffer cavity and the third buffer cavity are triangular, and the cross-section of the second buffer cavity is a trapezoid with the lower base located on the main beam body. The ratio a of the upper base to the lower base of the trapezoid satisfies: 0.55 ≤ a ≤ 0.65.

[0007] According to the expansion beam of this application, through the trapezoidal design of the above-mentioned second buffer cavity and combined with the range limitation of 0.55 ≤ a ≤ 0.65, the section moment of the expansion beam is optimized, the bending resistance of the expansion beam is improved, enabling the expansion beam to better resist deformation when subjected to bending force, thus extending the service life of the expansion beam. And through the combined use of the main beam body and the reinforcing beam body, as well as the triangular design of the first buffer cavity and the third buffer cavity, the overall strength and stiffness of the expansion beam are greatly improved, which helps the expansion beam better withstand various loads in the battery box and further significantly relieve the deformation or damage caused by the expansion of the battery cells, thereby improving the structural stability and reliability of the battery box.

[0008] According to one embodiment of this application, the main beam is bent to form a receiving groove extending along the length direction of the expansion beam. The reinforcing beam is installed in the receiving groove and includes a first protrusion, a second protrusion, and a third protrusion distributed along the height direction of the expansion beam. The first protrusion defines a first buffer cavity between itself and the main beam, the second protrusion defines a second buffer cavity between itself and the main beam, and the third protrusion defines a third buffer cavity between itself and the main beam. Both the first protrusion and the third protrusion are connected to the sidewall of the receiving groove.

[0009] According to one embodiment of this application, the first protrusion includes a first plate and a second plate bent and connected along the height direction of the expansion beam, the second plate being located on the side of the first plate near the second protrusion, the first plate being fixedly connected to the main beam body and fitting against one side wall of the receiving groove; the third protrusion includes a third plate and a fourth plate bent and connected along the height direction of the expansion beam, the third plate being located on the side of the fourth plate near the second protrusion, the fourth plate being fixedly connected to the main beam body and fitting against the other side wall of the receiving groove.

[0010] According to one embodiment of this application, the second protrusion includes a fifth plate, a sixth plate, and a seventh plate that are sequentially bent and connected along the height direction of the expansion beam. The fifth plate is located on the side of the sixth plate closer to the second plate, and the seventh plate is located on the side of the sixth plate closer to the third plate. The first plate and the second plate form an acute angle, the third plate and the fourth plate form an acute angle, the fifth plate and the sixth plate form an obtuse angle, and the sixth plate and the seventh plate form an obtuse angle.

[0011] According to one embodiment of this application, the bending angle α1 between the first plate and the second plate, and the bending angle β1 between the fifth plate and the sixth plate, satisfy: β1-α1=90°, 50°≤α1≤60°.

[0012] According to one embodiment of this application, the bending angle α2 between the third plate and the fourth plate, and the bending angle β2 between the sixth plate and the seventh plate, satisfy: β2-α2=90°, 50°≤α2≤60°.

[0013] According to one embodiment of this application, the reinforcing beam further includes:

[0014] A first transition section and a second transition section, wherein the first transition section is connected between the first protrusion and the second protrusion, and the second transition section is connected between the second protrusion and the third protrusion, both the first transition section and the second transition section are fixedly connected to the main beam body and are both in contact with the bottom wall of the receiving groove.

[0015] According to one embodiment of this application, a first groove is formed between the first protrusion and the second protrusion, and a second groove is formed between the second protrusion and the third protrusion; the expansion beam further includes:

[0016] The first reinforcing rib is installed in the first groove and is connected to both the first protrusion and the second protrusion.

[0017] The second reinforcing rib is installed in the second groove and is connected to both the second protrusion and the third protrusion.

[0018] According to one embodiment of this application, a plurality of first reinforcing ribs are provided, and the plurality of first reinforcing ribs are distributed at equal intervals along the length direction of the expansion beam in the first groove. The distance between the two outermost first reinforcing ribs and the end face of the reinforcing beam body that they are adjacent to is equal. The distance L1 between two adjacent first reinforcing ribs and the distance L2 between the two outermost first reinforcing ribs and the end face of the reinforcing beam body that they are adjacent to satisfy 2≤L1 / L2≤2.4.

[0019] According to one embodiment of this application, a plurality of second reinforcing ribs are provided, and the plurality of second reinforcing ribs are distributed at equal intervals along the length direction of the expansion beam in the second groove. The distance between the two outermost second reinforcing ribs and the end face of the reinforcing beam body that they are adjacent to is equal. The distance L3 between two adjacent second reinforcing ribs and the distance L4 between the two outermost first reinforcing ribs and the end face of the reinforcing beam body that they are adjacent to satisfy 2≤L3 / L4≤2.4.

[0020] Secondly, this application provides a battery box, which includes:

[0021] tray;

[0022] An expansion beam, as described above, is mounted on the tray.

[0023] According to the battery box of this application, the cross-sectional moment of the expansion beam is optimized by setting the expansion beam as described above, which improves the bending resistance of the expansion beam and enables the expansion beam to better resist deformation when subjected to bending force, thereby extending the service life of the expansion beam. Furthermore, through the combined use of the main beam and the reinforcing beam, as well as the triangular design of the first buffer cavity and the third buffer cavity, the overall strength and stiffness of the expansion beam are greatly improved, which helps the expansion beam to better bear various loads in the battery box and further significantly alleviates deformation or damage caused by cell expansion, thereby improving the structural stability and reliability of the battery box.

[0024] According to one embodiment of this application, the tray includes:

[0025] Tray body;

[0026] A support frame is installed at the bottom of the pallet body and surrounds each edge of the pallet body;

[0027] A reinforcing member is sandwiched between the tray body and the support frame.

[0028] According to one embodiment of this application, the battery box further includes:

[0029] A foamed buffer layer is provided, the tray forms a receiving cavity, the expansion beam is installed in the receiving cavity, the bottom wall of the receiving cavity forms a convex bulge, the expansion beam and the convex bulge form a foamed area, and the foamed buffer layer is disposed in the foamed area.

[0030] Thirdly, this application provides a battery comprising:

[0031] Battery boxes such as any of the above;

[0032] Multiple battery cells are installed inside the battery box.

[0033] According to the battery of this application, the cross-sectional moment of the expansion beam is optimized by the above-mentioned battery box configuration, which improves the bending resistance of the expansion beam and enables it to better resist deformation when subjected to bending force, thereby extending the service life of the expansion beam. Furthermore, through the combined use of the main beam and the reinforcing beam, as well as the triangular design of the first and third buffer cavities, the overall strength and stiffness of the expansion beam are significantly improved, which helps the expansion beam to better withstand various loads in the battery box and further significantly alleviates deformation or damage caused by cell expansion, thereby improving the structural stability and reliability of the battery box.

[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0035] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0036] Figure 1 This is a schematic diagram of the expansion beam provided in an embodiment of this application;

[0037] Figure 2 This is a side view of the main beam and the reinforcing beam provided in the embodiments of this application;

[0038] Figure 3 yes Figure 1Enlarged view of the structure at point A in the middle;

[0039] Figure 4 This is a front view of the expansion beam provided in the embodiment of this application;

[0040] Figure 5 This is a side view of the main beam provided in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the battery box provided in an embodiment of this application;

[0042] Figure 7 This is an exploded view of the battery box structure provided in an embodiment of this application;

[0043] Figure 8 This is a top view of the pallet body and expansion beam provided in the embodiments of this application;

[0044] Figure 9 This is a partial cross-sectional view of the battery box provided in an embodiment of this application.

[0045] Figure label:

[0046] Battery box 10;

[0047] Tray 11;

[0048] Tray body 111, receiving cavity 1111, convex bulge 1112, foaming area 1113, lifting lug sleeve 1114;

[0049] Support frame 112, reinforcement component 113;

[0050] Expansion beam 12;

[0051] Main beam 121, receiving groove 1211, main body 1212, flange 1213;

[0052] Strengthening beam 122, first protrusion 1221, first plate 12211, second plate 12212, second protrusion 1222, fifth plate 12221, sixth plate 12222, seventh plate 12223, third protrusion 1223, third plate 12231, fourth plate 12232, first transition section 1224, second transition section 1225;

[0053] First reinforcing rib 123, second reinforcing rib 124, first buffer cavity 125, second buffer cavity 126, third buffer cavity 127, first groove 128, second groove 129. Detailed Implementation

[0054] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0055] This application provides an expansion beam 12 applied to a battery box 10.

[0056] The following is for reference. Figures 1-9 The expansion beam 12 according to an embodiment of this application is described.

[0057] Unless otherwise specified, the length, width, and height directions of the expansion beam 12 in this application can be referred to as follows: Figure 1 As shown.

[0058] In some embodiments, such as Figure 1 As shown, the expansion beam 12 includes: a main beam body 121 and a reinforcing beam body 122.

[0059] The reinforcing beam 122 is connected to the main beam 121, and the reinforcing beam 122 forms a first buffer cavity 125, a second buffer cavity 126 and a third buffer cavity 127 distributed along the height direction of the expansion beam 12. The cross-sections of the first buffer cavity 125 and the third buffer cavity 127 are triangular, and the cross-section of the second buffer cavity 126 is a trapezoid with its lower base located on the main beam 121. The ratio a of the upper base to the lower base of the trapezoid satisfies: 0.55≤a≤0.65.

[0060] The main beam 121 is the main structure of the expansion beam 12, undertaking the main supporting and connecting functions. The main beam 121 can be made of sheet metal and manufactured through processes such as stamping, sheet metal work, forging, or welding; this application does not impose any restrictions on this.

[0061] The cross-sectional shape of the main beam 121 can be designed as C-shaped, H-shaped or I-shaped according to actual needs to provide sufficient strength and stiffness.

[0062] The reinforcing beam 122 is a supplementary structure to the main beam 121. Through its connection with the main beam 121, it enhances the overall strength and rigidity of the expansion beam 12. The reinforcing beam 122 can also be made of sheet metal and manufactured through processes such as stamping, sheet metal work, forging, or welding; this application does not impose any restrictions on this.

[0063] The reinforcing beam 122 may have similar material properties to the main beam 121, but its shape and size may differ to meet specific design requirements.

[0064] The connection between the reinforcing beam 122 and the main beam 121 can be welding, bolting, or other forms of mechanical connection, and there are no restrictions here.

[0065] For example, in some embodiments, the reinforcing beam 122 is welded to the main beam 121.

[0066] In this embodiment, the thickness of the main beam 121 and the thickness of the reinforcing beam 122 are equal.

[0067] In other embodiments, the thickness of the main beam 121 and the thickness of the reinforcing beam 122 are not equal.

[0068] like Figures 1-4 As shown, the first buffer cavity 125, the second buffer cavity 126, and the third buffer cavity 127 are formed through a specific layout and connection between the reinforcing beam 122 and the main beam 121. During the manufacturing process, the shape and size of the reinforcing beam 122 can be adjusted according to design requirements to form the desired shape and size of the buffer cavity.

[0069] Since the cross-sections of the first buffer cavity 125 and the third buffer cavity 127 are triangular, this design is beneficial for dispersing and absorbing stress from the expansion of the battery cell, improving the overall stability of the structure, and the triangular cross-sectional shape also enables the first buffer cavity 125 and the third buffer cavity 127 to resist deformation more effectively when subjected to pressure.

[0070] In this embodiment, such as Figure 2 As shown, the cross-sections of the first buffer cavity 125 and the third buffer cavity 127 are right-angled triangles.

[0071] In other embodiments, the cross-section of the first buffer cavity 125 is a right-angled triangle, and the cross-section of the third buffer cavity 127 is a regular triangle.

[0072] In some other embodiments, the cross-section of the first buffer cavity 125 is a regular triangle, and the cross-section of the third buffer cavity 127 is a right triangle.

[0073] The second buffer cavity 126 has a trapezoidal cross-section with its lower base located on the main beam 121. The ratio α between the upper and lower bases of the trapezoid is between 0.55 and 0.65. This ratio helps the second buffer cavity 126 to effectively absorb and disperse stress when the battery cell expands. At the same time, the trapezoidal cross-sectional shape also allows the second buffer cavity 126 to better disperse stress when subjected to pressure, thus alleviating local excessive deformation.

[0074] In this embodiment, such as Figure 2 As shown, the cross-section of the second buffer cavity 126 is an isosceles trapezoid.

[0075] In other embodiments, the cross-section of the second buffer cavity 126 is a right trapezoid.

[0076] In some other embodiments, the cross-section of the second buffer cavity 126 is a conventional trapezoid.

[0077] Among them, such as Figure 2 As shown, h4 is the upper base of the trapezoid, h3 is the lower base of the trapezoid, and a = h4 / h3, that is, 0.55 ≤ h4 / h3 ≤ 0.65.

[0078] Specifically, h4 / h3 can be 0.55, 0.582, 0.6, 0.6478, 0.65, or other values ​​between 0.55 and 0.65, without any restrictions.

[0079] In some embodiments, the lower base h3 of the trapezoid and the height h7 of the battery cell can satisfy 0.6≤h3 / h7≤0.7.

[0080] Specifically, h3 / h7 can be 0.6, 0.634, 0.65, 0.682, 0.7, or other values ​​between 0.6 and 0.7, without any restrictions.

[0081] By limiting the numerical range of h3 / h7, the size of the second buffer cavity 126 can be designed specifically according to the actual size of the battery cell in the battery box 10, so as to achieve the optimal constraint effect on the expansion of the battery cell.

[0082] Understandably, on the one hand, by designing the first buffer cavity 125 and the third buffer cavity 127 with triangular cross-sectional shapes, the expansion beam 12 has higher bending resistance when facing lateral loads, which helps protect the cells inside the battery box 10 from damage; on the other hand, the second buffer cavity 126 with a trapezoidal cross-sectional shape is directly opposite the center of the large surface of the cell. When multiple cells expand outward, the lower base of the trapezoid is squeezed first. At this time, the wider lower base of the second buffer cavity 126 can provide good support for the center of the large surface of the cell and minimize the probability of bending deformation in the center of the expansion beam 12, combined with 0.55≤a≤0. The design of the expansion beam 125 is specifically optimized to adapt to the direction and extent of cell expansion, thereby strengthening the cross-sectional moment of the expansion beam 12, improving the bending resistance of the expansion beam 12, making the stress distribution more uniform, reducing local stress concentration, and thus extending the service life of the expansion beam 12. On the other hand, the combination of the main beam 121 and the reinforcing beam 122 provides good structural stability, maintaining the overall shape and function of the battery box 10 even under cell expansion or other extreme conditions. Furthermore, the design of the expansion beam 12 can be adjusted according to different cell sizes and expansion characteristics, exhibiting good adaptability and flexibility.

[0083] The expansion beam 12 provided in this application embodiment, through the trapezoidal design of the second buffer cavity 126 and the range limitation of 0.55≤a≤0.65, optimizes the cross-sectional moment of the expansion beam 12, improves the bending resistance of the expansion beam 12, and enables the expansion beam 12 to better resist deformation when subjected to bending force, thereby extending the service life of the expansion beam 12. Furthermore, through the combined use of the main beam body 121 and the reinforcing beam body 122, as well as the triangular design of the first buffer cavity 125 and the third buffer cavity 127, the overall strength and stiffness of the expansion beam 12 are greatly improved, which helps the expansion beam 12 to better bear various loads in the battery box 10 and further significantly alleviates the deformation or damage caused by cell expansion, thereby improving the structural stability and reliability of the battery box 10.

[0084] In some embodiments, such as Figures 2-5 As shown, the main beam 121 is bent to form a receiving groove 1211 extending along the length direction of the expansion beam 12. The reinforcing beam 122 is installed in the receiving groove 1211. The reinforcing beam 122 includes a first protrusion 1221, a second protrusion 1222, and a third protrusion 1223 distributed along the height direction of the expansion beam 12. The first protrusion 1221 defines a first buffer cavity 125 between itself and the main beam 121. The second protrusion 1222 defines a second buffer cavity 126 between itself and the main beam 121. The third protrusion 1223 defines a third buffer cavity 127 between itself and the main beam 121. The first protrusion 1221 and the third protrusion 1223 are both connected to the sidewall of the receiving groove 1211.

[0085] In this embodiment, such as Figures 2-5 As shown, the main beam 121 can be formed by bending a metal sheet twice through sheet metal processing or other processes. The cross-section of the main beam 121 can be roughly C-shaped. Specifically, the main beam 121 includes a main body 1212 and flanges 1213 connected to both sides of the main body 1212 along the height direction of the expansion beam 12. The two flanges 1213 are folded in the same direction relative to the main body 1212. The main body 1212 forms the bottom wall of the receiving groove 1211, and the two flanges 1213 form the two side walls of the receiving groove 1211. The first protrusion 1221, the second protrusion 1222 and the third protrusion 1223 are all protruding in a direction away from the main body 1212. The first protrusion 1221 and the third protrusion 1223 are respectively connected to the two flanges 1213. The receiving groove 1211 is oriented in a direction away from the multiple battery cells.

[0086] It should be noted that in some embodiments, such as Figure 2 and Figure 5 As shown, the height H and width W of the main beam 121 can satisfy: 6.2≤H / W≤7.5.

[0087] Specifically, H / W can be 6.2, 6.83, 7, 7.225, 7.5, or other values ​​between 6.2 and 7.5, without any restrictions.

[0088] By limiting the range of H / W values, a suitable aspect ratio of the main beam 121 can be selected according to actual needs to achieve the optimal constraint effect on cell expansion.

[0089] The expansion beam 12 provided in this embodiment provides a structural basis for the assembly between the main beam 121 and the reinforcing beam 122, as well as the formation of the first buffer cavity 125, the second buffer cavity 126, and the third buffer cavity 127, through the design of the aforementioned receiving groove 1211, the first protrusion 1221, the second protrusion 1222, and the third protrusion 1223. The receiving groove 1211 not only provides space for the installation of the reinforcing beam 122, but also helps to improve the overall structural strength of the expansion beam 12, so that the expansion beam 12 can better resist deformation and damage when subjected to external forces. Furthermore, the connection between the first protrusion 1221 and the third protrusion 1223 and the sidewall of the receiving groove 1211 enhances the bending resistance of the expansion beam 12 and improves the stability and durability of the expansion beam 12 under stress.

[0090] In some embodiments, such as Figure 2 As shown, the first protrusion 1221 includes a first plate 12211 and a second plate 12212 that are bent and connected along the height direction of the expansion beam 12. The second plate 12212 is located on the side of the first plate 12211 near the second protrusion 1222. The first plate 12211 is fixedly connected to the main beam 121 and is in contact with one side wall of the receiving groove 1211. The third protrusion 1223 includes a third plate 12231 and a fourth plate 12232 that are bent and connected along the height direction of the expansion beam 12. The third plate 12231 is located on the side of the fourth plate 12232 near the second protrusion 1222. The fourth plate 12232 is fixedly connected to the main beam 121 and is in contact with the other side wall of the receiving groove 1211.

[0091] In this embodiment, such as Figure 2 and Figure 5As shown, the first protrusion 1221 and the third protrusion 1223 are symmetrically arranged with respect to the second protrusion 1222. Specifically, the bending angle α1 between the first plate 12211 and the second plate 12212 is equal to the bending angle α2 between the third plate 12231 and the fourth plate 12232. The first plate 12211 and the fourth plate 12232 are respectively attached to the two flanges 1213 of the main beam 121. The bent ends of the first plate 12211 and the fourth plate 12232 can be flush with the free ends of their respective attached flanges 1213. The second plate 12212 is inclined towards the bottom wall of the receiving groove 1211 from one end connected to the first plate 12211 to the other end. The third plate 12231 is inclined towards the bottom wall of the receiving groove 1211 from one end connected to the fourth plate 12232 to the other end.

[0092] In actual implementation, taking the welding connection between the first protrusion 1221 and the third protrusion 1223 and the main beam 121 as an example, the specific welding method may include, but is not limited to, laser welding, resistance welding or plug welding. The first plate 12211 may be attached to one of the flanges 1213, and the weld points of the two may be distributed between the bent end of the first plate 12211 and the free end of one of the flanges 1213; the fourth plate 12232 may be attached to another flange 1213, and the weld points of the two may be distributed between the bent end of the fourth plate 12232 and the free end of the other flange 1213.

[0093] It should be noted that in some embodiments, such as Figure 2 As shown, the height h1 of the first protrusion 1221, the height h6 of the third protrusion 1223, and the height h7 of the battery cell can satisfy: 0.12≤h1 / h7≤0.14; 0.12≤h6 / h7≤0.14.

[0094] Specifically, h1 / h7 can be 0.12, 0.125, 0.13, 0.14 or other values ​​between 0.12 and 0.14, and h6 / h7 can be 0.12, 0.13, 0.137, 0.14 or other values ​​between 0.12 and 0.14, without any restrictions here.

[0095] By limiting the numerical range of h1 / h7 and h6 / h7, the dimensions of the first buffer cavity 125 and the third buffer cavity 127 can be designed specifically according to the actual size of the battery cell, so as to achieve the optimal constraint effect on the expansion of the battery cell.

[0096] The expansion beam 12 provided in this embodiment provides a structural basis for the triangular cross-section of the first protrusion 1221 and the third protrusion 1223 through the arrangement of the first plate 12211, the second plate 12212, the third plate 12231, and the fourth plate 12232. At the same time, it enhances the structural stability of the first protrusion 1221 and the third protrusion 1223, enabling the expansion beam 12 to better withstand the force generated by the expansion of the battery cell. Combined with the fixed connection between the first plate 12211 and the fourth plate 12232 and the main beam body 121, as well as the fit with the side wall of the receiving groove 1211, a tight fit is achieved between the first protrusion 1221 and the third protrusion 1223 and the main beam body 121, increasing the contact area between the reinforcing beam body 122 and the main beam body 121, thereby helping to improve the rigidity of the overall structure.

[0097] In some embodiments, such as Figure 2 As shown, the second protrusion 1222 includes a fifth plate 12221, a sixth plate 12222, and a seventh plate 12223 that are sequentially bent and connected along the height direction of the expansion beam 12. The fifth plate 12221 is located on the side of the sixth plate 12222 that is close to the second plate 12212, and the seventh plate 12223 is located on the side of the sixth plate 12222 that is close to the third plate 12231. The first plate 12211 and the second plate 12212 form an acute angle, the third plate 12231 and the fourth plate 12232 form an acute angle, the fifth plate 12221 and the sixth plate 12222 form an obtuse angle, and the sixth plate 12222 and the seventh plate 12223 form an obtuse angle.

[0098] In this embodiment, such as Figure 2 and Figure 5 As shown, the fifth plate 12221 is inclined towards the bottom wall of the receiving groove 1211 from one end connected to the sixth plate 12222 to the other end, and the seventh plate 12223 is inclined towards the bottom wall of the receiving groove 1211 from one end connected to the sixth plate 12222 to the other end. The cross-section of the second buffer cavity 126 is an isosceles trapezoid. Specifically, the bending angle β1 between the fifth plate 12221 and the sixth plate 12222 is equal to the bending angle β2 between the sixth plate 12222 and the seventh plate 12223. When the first protrusion 1221 and the third protrusion 1223 are symmetrically arranged with respect to the second protrusion 1222, the entire reinforcing beam 122 has a symmetrical structure. Furthermore, when the two side flanges 1213 in the main beam 121 are symmetrically arranged with respect to the main body 1212, the entire expansion beam 12 has a symmetrical structure.

[0099] Understandably, on the one hand, the second protrusion 1222 is composed of the fifth plate 12221, the sixth plate 12222, and the seventh plate 12223, which are sequentially bent and connected. This design not only enhances the structural strength of the second protrusion 1222, but also allows the second protrusion 1222 to better cooperate with the first protrusion 1221 and the third protrusion 1223 to form a stable and effective buffer structure. On the other hand, since the first plate 12211 and the second plate 12212, as well as the third plate 12231 and the fourth plate 12232, all form acute angles, and The fifth plate 12221 and the sixth plate 12222, as well as the sixth plate 12222 and the seventh plate 12223, are all obtuse angles, which can optimize stress distribution and make the stress of the expansion beam 12 more uniform when bearing load, reducing stress concentration points. Furthermore, the second plate 12212, the third plate 12231, the fifth plate 12221, and the seventh plate 12223 are all inclined. The multi-diagonal rib structure design maximizes the cross-sectional spacing of the expansion beam 12 and optimizes the expansion constraint performance of the expansion beam 12 on multiple cells to the greatest extent.

[0100] The expansion beam 12 provided in this application embodiment enhances the structural strength of the second protrusion 1222 by setting the fifth plate 12221, the sixth plate 12222, and the seventh plate 12223 that are sequentially bent and connected. At the same time, it also improves the overall structural stability of the expansion beam 12 and optimizes the stress distribution, making the stress of the expansion beam 12 more uniform when bearing load and reducing stress concentration points. In addition, by using the structural design of multiple diagonal ribs, the cross-sectional distance of the expansion beam 12 is increased as much as possible, maximizing the optimization of the expansion constraint performance of the expansion beam 12 on multiple battery cells.

[0101] In some embodiments, such as Figure 2 As shown, the bending angle α1 between the first plate 12211 and the second plate 12212, and the bending angle β1 between the fifth plate 12221 and the sixth plate 12222, satisfy: β1-α1=90°, 50°≤α1≤60°.

[0102] In other words, the bending angle β1 between the fifth plate 12221 and the sixth plate 12222 satisfies: 140°≤β1≤150°.

[0103] Specifically, the bending angle α1 between the first plate 12211 and the second plate 12212 can be 50°, 53.6°, 55°, 57.98°, 60° or other values ​​between 50° and 60°, and the bending angle β1 between the fifth plate 12221 and the sixth plate 12222 can be 140°, 143.6°, 145°, 147.98°, 150° or other values ​​between 140° and 150°, without any restrictions here.

[0104] The expansion beam 12 provided in this application embodiment, by limiting the range of α1 and β1 as described above, can optimize the local stress distribution of the expansion beam 12. When the expansion beam 12 is subjected to the expansion force of the battery cell, it helps to disperse and balance the force, reduce structural deformation, and enhance the overall stability of the battery box 10. On the other hand, the processing and manufacturing process of the expansion beam 12 becomes more standardized and controllable, which helps to reduce processing difficulty and cost, improve production efficiency and product quality. Furthermore, without affecting the structural strength, the weight of the expansion beam 12 is reduced as much as possible, thereby reducing the weight of the battery and improving the energy efficiency of the power device.

[0105] In some embodiments, such as Figure 2 As shown, the bending angle α2 between the third plate 12231 and the fourth plate 12232, and the bending angle β2 between the sixth plate 12222 and the seventh plate 12223, satisfy: β2-α2=90°, 50°≤α2≤60°.

[0106] In other words, the bending angle β2 between the sixth plate 12222 and the seventh plate 12223 satisfies: 140°≤β2≤150°.

[0107] Specifically, the bending angle α2 between the third plate 12231 and the fourth plate 12232 can be 50°, 51.35°, 55°, 56.447°, 60° or other values ​​between 50° and 60°, and the bending angle β2 between the sixth plate 12222 and the seventh plate 12223 can be 140°, 141.35°, 145°, 146.447°, 150° or other values ​​between 140° and 150°, without any restrictions here.

[0108] The expansion beam 12 provided in this application embodiment, by limiting the range of α2 and β2 as described above, can optimize the local stress distribution of the expansion beam 12. When the expansion beam 12 is subjected to the expansion force of the battery cell, it helps to disperse and balance the force, reduce structural deformation, and enhance the overall stability of the battery box 10. On the other hand, the processing and manufacturing process of the expansion beam 12 becomes more standardized and controllable, which helps to reduce processing difficulty and cost, improve production efficiency and product quality. Furthermore, without affecting the structural strength, the weight of the expansion beam 12 is reduced as much as possible, thereby reducing the weight of the battery and improving the energy efficiency of the power device.

[0109] In some embodiments, such as Figures 2-4 As shown, the reinforced beam 122 also includes: a first transition section 1224 and a second transition section 1225.

[0110] The first transition section 1224 is connected between the first protrusion 1221 and the second protrusion 1222, and the second transition section 1225 is connected between the second protrusion 1222 and the third protrusion 1223. The first transition section 1224 and the second transition section 1225 are both fixedly connected to the main beam 121, and the first transition section 1224 and the second transition section 1225 are both in contact with the bottom wall of the receiving groove 1211.

[0111] In this embodiment, such as Figure 2 and Figure 5 As shown, the entire expansion beam 12 has a symmetrical structure. The first protrusion 1221 and the third protrusion 1223 are symmetrically arranged with respect to the second protrusion 1222. The first transition section 1224 and the second transition section 1225 are symmetrically arranged with respect to the second protrusion 1222. The first transition section 1224 is used to connect the second plate 12212 and the fifth plate 12221. The second transition section 1225 is used to connect the third plate 12231 and the seventh plate 12223. Both the first transition section 1224 and the second transition section 1225 are attached to the main body 1212 of the main beam body 121.

[0112] In actual implementation, taking the welding connection between the first transition section 1224 and the second transition section 1225 and the main beam 121 as an example, the specific welding method can include, but is not limited to, laser welding, resistance welding, or plug welding. The first transition section 1224 can be attached to the main body 1212. Multiple welding points can be designed between the first transition section 1224 and the main body 1212. Multiple welding points are distributed at intervals on the connection interface between the first transition section 1224 and the main body 1212. Multiple means two or more. The second transition section 1225 can be attached to the main body 1212. Multiple welding points can be designed between the second transition section 1225 and the main body 1212. Multiple welding points are distributed at intervals on the connection interface between the second transition section 1225 and the main body 1212. Multiple means two or more.

[0113] It should be noted that in some embodiments, such as Figure 2 As shown, the height h2 of the first transition section 1224, the height h5 of the second transition section 1225, and the height h7 of the battery cell can satisfy: 0.04≤h2 / h7≤0.07; 0.04≤h5 / h7≤0.07.

[0114] Specifically, h2 / h7 can be 0.04, 0.055, 0.06, 0.07 or other values ​​between 0.04 and 0.07, and h5 / h7 can be 0.04, 0.05, 0.063, 0.07 or other values ​​between 0.04 and 0.07, without any restrictions.

[0115] By limiting the numerical range of h2 / h7 and h5 / h7, the dimensions of the first transition section 1224 and the second transition section 1225 can be designed specifically according to the actual size of the battery cell, so as to achieve the optimal constraint effect on the expansion of the battery cell.

[0116] The expansion beam 12 provided in this application embodiment, through the setting of the first transition section 1224 and the second transition section 1225, realizes the connection between the first protrusion 1221 and the third protrusion 1223 and the second protrusion 1222, further enhancing the overall structural strength of the expansion beam 12. Combined with the fixed connection between the first transition section 1224 and the second transition section 1225 and the main beam body 121, and the fit with the bottom wall of the receiving groove 1211, the tight fit between the first transition section 1224 and the second transition section 1225 and the main beam body 121 is realized, further increasing the contact area between the reinforcing beam body 122 and the main beam body 121, thereby further improving the rigidity of the overall structure, so that the expansion beam 12 can better maintain the stability of its shape and size when subjected to the expansion force of the battery cell.

[0117] In some embodiments, such as Figure 1 and Figure 4 As shown, a first groove 128 is formed between the first protrusion 1221 and the second protrusion 1222, and a second groove 129 is formed between the second protrusion 1222 and the third protrusion 1223; the expansion beam 12 also includes a first reinforcing rib 123 and a second reinforcing rib 124.

[0118] The first reinforcing rib 123 is installed in the first groove 128, and the first reinforcing rib 123 is connected to both the first protrusion 1221 and the second protrusion 1222; the second reinforcing rib 124 is installed in the second groove 129, and the second reinforcing rib 124 is connected to both the second protrusion 1222 and the third protrusion 1223.

[0119] The first reinforcing rib 123 can be made of metal block material and processed into shape by cutting, milling or other processes.

[0120] The first reinforcing rib 123 can be connected to the first protrusion 1221 and the second protrusion 1222 by welding, riveting, bolting or other suitable mechanical connection methods, which is not limited here.

[0121] For example, in some embodiments, the first reinforcing rib 123 is welded to both the first protrusion 1221 and the second protrusion 1222.

[0122] The second reinforcing rib 124 can be made of metal block material and processed into shape by cutting, milling or other processes.

[0123] The second reinforcing rib 124 can be connected to the second protrusion 1222 and the third protrusion 1223 by welding, riveting, bolting or other suitable mechanical connection methods, which is not limited here.

[0124] For example, in some embodiments, the second reinforcing rib 124 is welded to both the second protrusion 1222 and the third protrusion 1223.

[0125] In this embodiment, such as Figure 1 and Figure 4 As shown, the first groove 128 is trapezoidal, and the first transition section 1224 forms the upper base of the trapezoid. Based on this, the first reinforcing rib 123 can be generally designed as a trapezoidal block, and the two waists of the trapezoidal block can be fitted and connected to the first protrusion 1221 and the second protrusion 1222 respectively. The second groove 129 is trapezoidal, and the second transition section 1225 forms the upper base of the trapezoid. Based on this, the second reinforcing rib 124 can be generally designed as a trapezoidal block, and the two waists of the trapezoidal block can be fitted and connected to the second protrusion 1222 and the third protrusion 1223 respectively.

[0126] In actual implementation, taking the welding connection between the first reinforcing rib 123 and the second reinforcing rib 124 and the reinforcing beam 122 as an example, the specific welding method may include, but is not limited to, laser welding, resistance welding or plug welding. Specifically, the two corners of the first reinforcing rib 123 away from the first transition section 1224 can be flattened so that gaps are left between the first reinforcing rib 123 and the first protrusion 1221 and the second protrusion 1222 to fill the welding material; the two corners of the second reinforcing rib 124 away from the second transition section 1225 can be flattened so that gaps are left between the second reinforcing rib 124 and the second protrusion 1222 and the third protrusion 1223 to fill the welding material.

[0127] The expansion beam 12 provided in this embodiment effectively enhances the load-bearing capacity in these weak areas through the provision of the first reinforcing rib 123 and the second reinforcing rib 124. When the expansion beam 12 is subjected to the expansion force of the battery core, the first reinforcing rib 123 and the second reinforcing rib 124 can disperse and absorb part of the stress, thereby alleviating the stress concentration phenomenon on the main beam 121 and the reinforcing beam 122. At the same time, it also improves the durability of the expansion beam 12. During long-term use, even if subjected to continuous load or vibration, the expansion beam 12 can maintain its original shape and performance.

[0128] In some embodiments, such as Figure 4As shown, multiple first reinforcing ribs 123 are provided, and the multiple first reinforcing ribs 123 are distributed at equal intervals along the length direction of the expansion beam 12 in the first groove 128. The distance between the two outermost first reinforcing ribs 123 and the end face of their respective adjacent reinforcing beam 122 is equal. The distance L1 between two adjacent first reinforcing ribs 123 and the distance L2 between the two outermost first reinforcing ribs 123 and the end face of their respective adjacent reinforcing beam 122 satisfy 2≤L1 / L2≤2.4.

[0129] Wherein, "multiple" refers to two or more, for example, in some embodiments, such as... Figure 1 and Figure 4 As shown, three first reinforcing ribs 123 are provided, and the three first reinforcing ribs 123 are distributed at equal intervals along the length of the expansion beam 12 in the first groove 128.

[0130] Specifically, L1 / L2 can be 2, 2.15, 2.2, 2.386, 2.4 or other values ​​between 2 and 2.4, without any restrictions here.

[0131] The expansion beam 12 provided in this embodiment can significantly improve the local structural strength of the expansion beam 12 by setting multiple equidistant first reinforcing ribs 123 in the first groove 128 as described above. This allows the expansion beam 12 to better resist deformation and damage when subjected to external forces. At the same time, the equidistant distribution design helps to form a uniform stress field inside the expansion beam 12, reducing the occurrence of stress concentration, thereby helping to extend the service life of the expansion beam 12. Combined with the limitation of the range of L1 / L2, the mechanical properties of the expansion beam 12 can be further optimized, effectively balancing the relationship between the reinforcement effect of the first reinforcing ribs 123 and the manufacturing cost.

[0132] In some embodiments, such as Figure 4 As shown, multiple second reinforcing ribs 124 are provided, and the multiple second reinforcing ribs 124 are distributed at equal intervals along the length direction of the expansion beam 12 in the second groove 129. The distance between the two outermost second reinforcing ribs 124 and the end face of their respective adjacent reinforcing beam 122 is equal. The distance L3 between two adjacent second reinforcing ribs 124 and the distance L4 between the two outermost first reinforcing ribs 123 and the end face of their respective adjacent reinforcing beam 122 satisfy 2≤L3 / L4≤2.4.

[0133] Wherein, "multiple" refers to two or more, for example, in some embodiments, such as... Figure 1 and Figure 4 As shown, three second reinforcing ribs 124 are provided, and the three second reinforcing ribs 124 are distributed at equal intervals along the length of the expansion beam 12 in the second groove 129.

[0134] Specifically, L3 / L4 can be 2, 2.181, 2.2, 2.386, 2.4 or other values ​​between 2 and 2.4, without any restrictions here.

[0135] The expansion beam 12 provided in this embodiment can significantly improve the local structural strength of the expansion beam 12 by setting multiple equidistant first reinforcing ribs 123 in the first groove 128 as described above. This allows the expansion beam 12 to better resist deformation and damage when subjected to external forces. At the same time, the equidistant distribution design helps to form a uniform stress field inside the expansion beam 12, reducing the occurrence of stress concentration, thereby helping to extend the service life of the expansion beam 12. Combined with the limitation of the range of L1 / L2, the mechanical properties of the expansion beam 12 can be further optimized, effectively balancing the relationship between the reinforcement effect of the first reinforcing ribs 123 and the manufacturing cost.

[0136] This application also provides a battery box 10.

[0137] In some embodiments, such as Figure 6 As shown, the battery box 10 includes a tray 11 and an expansion beam 12 as described in any of the above embodiments.

[0138] The expansion beam 12 is installed on the pallet 11.

[0139] The expansion beam 12 can be installed on the tray 11 by welding, riveting or bolting, etc., and there are no restrictions here.

[0140] For example, in some embodiments, the expansion beam 12 is installed on the tray 11 by welding.

[0141] The battery box 10 provided in this application embodiment optimizes the cross-sectional moment of the expansion beam 12 by setting the expansion beam 12, thereby improving the bending resistance of the expansion beam 12. This allows the expansion beam 12 to better resist deformation when subjected to bending force, thus extending the service life of the expansion beam 12. Furthermore, through the combined use of the main beam 121 and the reinforcing beam 122, as well as the triangular design of the first buffer cavity 125 and the third buffer cavity 127, the overall strength and stiffness of the expansion beam 12 are significantly improved. This helps the expansion beam 12 to better withstand various loads in the battery box 10 and further significantly alleviates deformation or damage caused by cell expansion, thereby improving the structural stability and reliability of the battery box 10.

[0142] In some embodiments, such as Figure 7 As shown, the pallet 11 includes: pallet body 111, support frame 112 and reinforcement 113.

[0143] The support frame 112 is installed at the bottom of the pallet body 111 and is arranged around each edge of the pallet body 111; the reinforcing member 113 is clamped between the pallet body 111 and the support frame 112.

[0144] Multiple reinforcing members 113 can be provided, and multiple reinforcing members 113 are spaced apart and clamped on the two opposite sides of the pallet body 111 along the support frame 112. Multiple means two or more.

[0145] For example, in some embodiments, eight reinforcement members 113 may be provided.

[0146] The assembly methods of the pallet body 111, support frame 112 and reinforcing member 113 may include, but are not limited to, welding, riveting, bolting, bonding or a combination of two or more of the above.

[0147] For example, in some embodiments, the pallet body 111, the support frame 112 and the reinforcing member 113 are assembled by welding. The specific welding method may include, but is not limited to, argon arc welding, resistance welding, laser welding, submerged arc welding or a combination of two or more of the above.

[0148] In actual implementation, such as Figure 7 and Figure 9 As shown, a support frame 112 is added to the bottom of the pallet body 111 to comprehensively strengthen the structural strength of each edge of the pallet body 111. Considering that the lifting lugs of the pallet body 111 are the main force transmission area, reinforcement members 113 are added to this force transmission area to enhance its structural strength. The pallet body 111 includes multiple lifting lug sleeves 1114, each corresponding to a reinforcement member 113. Taking the welding connection between the pallet body 111, support frame 112, and reinforcement members 113 as an example, the lifting lug sleeves 1114 are welded to the lifting lug holes on the pallet body 111. After the support frame 112 and the reinforcement members 113 are pre-welded, the integrated structure formed by the support frame 112 and the reinforcement members 113 is then welded to the lifting lug sleeves 1114. Specifically, the support frame 112 and the reinforcement members 1114 are welded together. All three components are provided with through holes for connecting the lifting lug sleeves 1114. After the support frame 112 and multiple reinforcing members 113 are pre-welded, the multiple through holes on the support frame 112 correspond one-to-one with the multiple through holes on the multiple reinforcing members 113. Then, the lifting lug sleeves 1114 are passed through the multiple through holes on the multiple reinforcing members 113 and the multiple through holes on the support frame 112. Finally, the connection interfaces between the lifting lug sleeves 1114 and the multiple through holes on the multiple reinforcing members 113 and the multiple through holes on the support frame 112 are welded to complete the assembly of the entire tray 11. Using the above-described overall welding assembly scheme for the tray 11 simplifies the manufacturing and assembly process, reduces the difficulty and complexity of the process, and accelerates the production efficiency of the battery box 10.

[0149] The battery box 10 provided in this application embodiment, through the setting of the support frame 112 and the reinforcing member 113, realizes the comprehensive reinforcement of the edge of the tray body 111 and the further reinforcement of the local weak areas. Using this structural reinforcement form can significantly improve the overall rigidity of the tray 11, increase the natural frequency of the entire battery, and enhance the fatigue durability of the battery box 10 under vibration load, thereby maximizing the optimization of the battery box 10's impact resistance, vibration fatigue resistance, and expansion restraint performance, while significantly reducing the number of structural components and improving the structural integration of the battery box 10, thereby realizing the miniaturization and lightweight design of the entire battery box 10.

[0150] In some embodiments, the battery box 10 further includes a foamed buffer layer.

[0151] like Figure 8 As shown, the tray 11 forms a receiving cavity 1111, the expansion beam 12 is installed in the receiving cavity 1111, the bottom wall of the receiving cavity 1111 forms a bulge 1112, the expansion beam 12 and the bulge 1112 enclose and form a foamed area 1113, and a foamed buffer layer is provided in the foamed area 1113.

[0152] The foamed buffer layer can be made of expanded polystyrene, pearl cotton, polyurethane foam, polypropylene foam, or expanded polypropylene, etc., and there are no restrictions here.

[0153] The thickness of the foamed buffer layer can be adjusted according to actual needs, and this application does not limit it.

[0154] In actual implementation, such as Figure 8 As shown, the cavity 1111 is provided with two longitudinally spaced expansion beams 12, and the bottom wall of the cavity 1111 forms two transversely spaced protrusions 1112. Thus, the two expansion beams 12 and the two protrusions 1112 can form a cofferdam structure, which defines the foaming area 1113. The foamed buffer layer is formed by online foaming of buffer material. After foaming, the bottom of the cured foamed buffer layer is directly bonded to the tray 11 without the need for additional structural adhesive. Similarly, the side of the cured foamed buffer layer is also directly bonded to the expansion beams 12. Multiple battery cells can be installed in the cavity 1111 and placed on the foamed buffer layer. When the battery is subjected to bottom impact load, the foamed buffer layer can play a buffering and energy absorption role, improving the battery's impact resistance.

[0155] The height of the expansion beam 12 can be customized according to the height of the battery cell and the thickness of the foam buffer layer.

[0156] For example, in some embodiments, the height of the expansion beam 12 (i.e., the height H of the main beam 121) can be equal to the height of the battery cell plus the thickness of the foamed buffer layer.

[0157] For example, in some other embodiments, the height of the expansion beam 12 (i.e., the height H of the main beam 121) can be greater than the height of the battery cell plus the thickness of the foamed buffer layer.

[0158] The battery box 10 provided in this application embodiment, through the above-mentioned foamed buffer layer, can play a buffering and energy-absorbing role when the battery is subjected to bottom impact load, thereby improving the battery's impact resistance. In addition, by installing the expansion beam 12 in the receiving cavity 1111, compared with the common solution of installing it on the edge of the tray 11, no additional sealing design is required, reducing the number of required parts, simplifying the assembly process, and improving the structural integration of the battery.

[0159] This application also provides a battery.

[0160] The battery provided in this application embodiment can be applied to electrical devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft.

[0161] The battery provided in this application embodiment can also be applied to energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc.

[0162] In some embodiments, the battery includes a battery case 10 as described in any of the above embodiments and a plurality of battery cells.

[0163] Multiple battery cells are installed inside the battery box 10.

[0164] In this embodiment, multiple battery cells are stacked longitudinally in the receiving cavity 1111 of the tray 11 and located between two expansion beams 12. The bottoms of the multiple battery cells can be fixedly connected to the foamed buffer layer by adhesive or other means.

[0165] The battery provided in this application embodiment optimizes the cross-sectional moment of the expansion beam 12 through the aforementioned battery box 10 configuration, thereby improving the bending resistance of the expansion beam 12. This allows the expansion beam 12 to better resist deformation when subjected to bending forces, thus extending the service life of the expansion beam 12. Furthermore, through the combined use of the main beam 121 and the reinforcing beam 122, as well as the triangular design of the first buffer cavity 125 and the third buffer cavity 127, the overall strength and stiffness of the expansion beam 12 are significantly improved. This helps the expansion beam 12 to better withstand various loads in the battery box 10 and further significantly alleviates deformation or damage caused by cell expansion, thereby improving the structural stability and reliability of the battery box 10.

[0166] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0167] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0168] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0169] In the description of this application, "multiple" means two or more.

[0170] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0171] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0172] Other configurations of the embodiments of this application, such as ... and ..., and operations, are known to those skilled in the art and will not be described in detail here.

[0173] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0174] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An expansion beam used in a battery box, characterized in that, include: Main beam; A reinforced beam is connected to the main beam and forms a first buffer cavity, a second buffer cavity, and a third buffer cavity distributed along the height direction of the expansion beam. The cross-sections of the first buffer cavity and the third buffer cavity are triangular, and the cross-section of the second buffer cavity is a trapezoid with its lower base located on the main beam. The ratio 'a' of the upper base to the lower base of the trapezoid satisfies: 0.55 ≤ a ≤ 0.

65.

2. The expansion beam according to claim 1, characterized in that, The main beam is bent to form a receiving groove extending along the length direction of the expansion beam. The reinforcing beam is installed in the receiving groove and includes a first protrusion, a second protrusion, and a third protrusion distributed along the height direction of the expansion beam. The first protrusion defines a first buffer cavity between itself and the main beam, the second protrusion defines a second buffer cavity between itself and the main beam, and the third protrusion defines a third buffer cavity between itself and the main beam. Both the first protrusion and the third protrusion are connected to the sidewall of the receiving groove.

3. The expansion beam according to claim 2, characterized in that, The first protrusion includes a first plate and a second plate that are bent and connected along the height direction of the expansion beam. The second plate is located on the side of the first plate near the second protrusion. The first plate is fixedly connected to the main beam and fits against one side wall of the receiving groove. The third protrusion includes a third plate and a fourth plate that are bent and connected along the height direction of the expansion beam. The third plate is located on the side of the fourth plate near the second protrusion. The fourth plate is fixedly connected to the main beam and fits against the other side wall of the receiving groove.

4. The expansion beam according to claim 3, characterized in that, The second protrusion includes a fifth plate, a sixth plate, and a seventh plate that are sequentially bent and connected along the height direction of the expansion beam. The fifth plate is located on the side of the sixth plate closer to the second plate, and the seventh plate is located on the side of the sixth plate closer to the third plate. The first plate and the second plate form an acute angle, the third plate and the fourth plate form an acute angle, the fifth plate and the sixth plate form an obtuse angle, and the sixth plate and the seventh plate form an obtuse angle.

5. The expansion beam according to claim 4, characterized in that, The bending angle α1 between the first plate and the second plate, and the bending angle β1 between the fifth plate and the sixth plate, satisfy: β1-α1=90°, 50°≤α1≤60°; And / or, The bending angle α2 between the third plate and the fourth plate, and the bending angle β2 between the sixth plate and the seventh plate, satisfy: β2-α2=90°, 50°≤α2≤60°.

6. The expansion beam according to claim 2, characterized in that, The reinforced beam also includes: A first transition section and a second transition section, wherein the first transition section is connected between the first protrusion and the second protrusion, and the second transition section is connected between the second protrusion and the third protrusion, both the first transition section and the second transition section are fixedly connected to the main beam body and are both in contact with the bottom wall of the receiving groove.

7. The expansion beam according to any one of claims 2-6, characterized in that, A first groove is formed between the first protrusion and the second protrusion, and a second groove is formed between the second protrusion and the third protrusion; the expansion beam further includes: The first reinforcing rib is installed in the first groove and is connected to both the first protrusion and the second protrusion. The second reinforcing rib is installed in the second groove and is connected to both the second protrusion and the third protrusion.

8. The expansion beam according to claim 7, characterized in that, Multiple first reinforcing ribs are provided, and the multiple first reinforcing ribs are distributed at equal intervals along the length direction of the expansion beam in the first groove. The distance between the two outermost first reinforcing ribs and the end face of the reinforcing beam body that they are close to is equal. The distance L1 between two adjacent first reinforcing ribs and the distance L2 between the two outermost first reinforcing ribs and the end face of the reinforcing beam body that they are close to satisfy 2≤L1 / L2≤2.

4. And / or, Multiple second reinforcing ribs are provided, and the multiple second reinforcing ribs are distributed at equal intervals along the length direction of the expansion beam in the second groove. The distance between the two outermost second reinforcing ribs and the end face of the reinforcing beam body that they are close to is equal. The distance L3 between two adjacent second reinforcing ribs and the distance L4 between the two outermost first reinforcing ribs and the end face of the reinforcing beam body that they are close to satisfy 2≤L3 / L4≤2.

4.

9. A battery box, characterized in that, include: tray; The expansion beam as described in any one of claims 1-8 is mounted on the tray.

10. The battery box according to claim 9, characterized in that, The tray includes: Tray body; A support frame is installed at the bottom of the pallet body and surrounds each edge of the pallet body; A reinforcing member is sandwiched between the tray body and the support frame.

11. The battery box according to claim 9, characterized in that, Also includes: A foamed buffer layer is provided, the tray forms a receiving cavity, the expansion beam is installed in the receiving cavity, the bottom wall of the receiving cavity forms a convex bulge, the expansion beam and the convex bulge form a foamed area, and the foamed buffer layer is disposed in the foamed area.

12. A battery, characterized in that, include: The battery box as described in any one of claims 9-11; Multiple battery cells are installed inside the battery box.

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