Lower box, battery box, battery pack and vehicle

Abstract

The utility model discloses a lower box, a battery box, a battery pack and a vehicle. The lower box includes: a support frame; a bottom guard plate, the bottom guard plate and the support frame enclose a receiving groove; a tray, the tray is arranged in the receiving groove and connected to the support frame, and the tray forms a battery module receiving groove. With the lower box, battery box, battery pack and vehicle of the utility model, the support frame acts as a load-bearing structure, and the tray seals the battery module to ensure the airtightness of the battery pack. When subjected to a mechanical collision, even if the sealing of the support frame fails, the sealing performance of the tray will not be damaged, and the airtightness of the battery pack can still be ensured, thereby avoiding the airtightness failure of the battery pack after a collision, further reducing the risk of airtightness failure, and improving the safety performance of the battery pack.

Description

Technical Field

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

[0002] The battery pack of an electric vehicle arranges the battery modules and electrical components in a battery box and ensures the airtightness of the battery pack. The battery box includes an upper cover and a lower box body. The battery modules and electrical components are arranged in the lower box body, and the upper cover covers the lower box body. In the prior art, the lower box body is an aluminum profile welded structure, in which a plurality of aluminum profiles are welded together to form a frame, and the bottom plate is welded to the frame. The frame and the bottom plate enclose a space for accommodating the battery modules and electrical components. The welds between the profiles that make up the frame not only ensure the airtightness of the battery pack, but also serve as a load-bearing structure. When subjected to mechanical collision conditions, if the welds between the profiles that make up the frame fail, the battery pack will fail to be airtight, which is a high risk. Utility Model Content

[0003] In view of this, the utility model provides a lower box, a battery box, a battery pack and a vehicle to solve the above technical problems.

[0004] The lower box provided by the utility model comprises:

[0005] Support frame;

[0006] A bottom guard plate, wherein the bottom guard plate and the support frame enclose a receiving groove;

[0007] A tray is disposed in the receiving groove and connected to the supporting frame, and the tray is formed with a battery module receiving groove.

[0008] Optionally, the tray extends a first flange at a notch of the accommodating groove in a direction away from the accommodating groove, and the first flange is placed on an end of the supporting frame facing away from the bottom guard plate and is fixedly connected to the supporting frame.

[0009] Optionally, the tray is integrally formed.

[0010] Optionally, the lower box body further includes: a reinforcing plate, which is connected to the end surface of the supporting frame facing the bottom guard plate, and is connected to an outer wall of one side of the tray facing the bottom guard plate.

[0011] Optionally, the lower box body further includes: a crossbeam, the crossbeam is disposed in the accommodating groove, and opposite ends of the crossbeam are respectively fixedly connected to the inner wall of the tray.

[0012] Optionally, the lower box body also includes: a transfer block, a first side surface of the transfer block is connected to the inner wall of the pallet, a second side surface of the transfer block is connected to the cross beam, the first side surface and the second side surface are arranged opposite to each other, and the first side surface is arranged parallel to the inner wall of the pallet, and the second side surface is arranged parallel to the end face of the cross beam.

[0013] Optionally, the crossbeam is provided with a weight-reducing hole along the extension direction;

[0014] The adapter block includes a first connecting part and a second connecting part, the first connecting part is inserted into the weight-reducing hole and is adhesively connected to the inner wall of the beam, a side surface of the second connecting part facing the first connecting part abuts against the end surface of the beam, and a side surface of the second connecting part facing away from the first connecting part is adhesively connected to the inner wall of the pallet.

[0015] Optionally, the bottom guard plate is formed with an avoidance groove in a direction away from the tray, and a second flange is extended from the notch of the avoidance groove in a direction away from the avoidance groove, and the second flange is detachably connected to the support frame.

[0016] Optionally, the support frame includes two end plates arranged opposite to each other and two side plates arranged opposite to each other, the adjacent end plates are welded to the side plates, the side plates extend a third flange away from the accommodating groove, the third flange is penetrated by a mounting hole, and the side surface of the side plate facing the tray is arranged parallel to each other.

[0017] The utility model also provides a battery box, comprising an upper cover and a lower box body as described in any one of the above items, wherein the upper cover covers the accommodating groove of the lower box body and is detachably connected to a supporting frame of the lower box body.

[0018] The utility model also provides a battery pack, including a battery module and the above-mentioned battery box, wherein the battery module is arranged in a receiving groove of the battery box.

[0019] The utility model also provides a vehicle, comprising the battery pack described above.

[0020] Compared with the prior art, the above technical solution provided by the utility model has at least the following beneficial effects:

[0021] With the lower box body, battery box, battery pack and vehicle of the utility model, the support frame acts as a load-bearing structure, and the tray seals the battery module to ensure the airtightness of the battery pack. When subjected to a mechanical collision, even if the seal of the support frame fails, the sealing performance of the tray will not be damaged, and the airtightness of the battery pack can still be ensured, thereby avoiding the airtightness failure of the battery pack after a collision, further reducing the risk that may be caused by airtightness failure, and being able to improve the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An exploded view of a lower box according to an embodiment of the utility model;

[0023] Figure 2 for Figure 1 The assembly diagram of the lower box shown;

[0024] Figure 3 for Figure 2 The cross-sectional view of the lower box body at AA' is shown;

[0025] Figure 4 for Figure 2 A schematic diagram of the connection relationship between the reinforcing plate and the supporting frame in the lower box body;

[0026] Figure 5 for Figure 2 The schematic diagram of the structure of the transfer block in the lower box is shown;

[0027] Figure 6 for Figure 2 A schematic diagram showing the connection between the cross beam in the lower box and the pallet by means of a transfer block;

[0028] Figure 7 for Figure 2 A schematic diagram of the installation process of the tray and the support frame in the lower box is shown;

[0029] Figure 8 for Figure 2 The schematic diagram of the installation process of the crossbeam and the tray in the lower box is shown;

[0030] Fig. 9 for Figure 2 A schematic diagram of the installation process of the bottom guard plate and the support frame in the lower box body is shown;

[0031] Fig.10 For Figure 2 Schematic diagram of the process of placing the battery module in the lower box.

[0032] Reference numerals:

[0033] 1: Support frame; 101: End plate; 102: Third flange; 103: Side plate; 2: Bottom guard plate; 201: Avoidance groove; 202: Second flange; 3: Tray; 301: Accommodation groove; 302: First flange; 4: Reinforcement plate; 5: Crossbeam; 6: Adapter block; 601: First connection part; 602: Second connection part; 7: Battery module. DETAILED DESCRIPTION

[0034] The specific implementation of the present utility model will be further described below in conjunction with the accompanying drawings.

[0035] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a variety of structural modes and implementation modes can be replaced by those skilled in the art. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction on the technical solution of the utility model.

[0036] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0037] Figure 1 An exploded view of a lower box according to an embodiment of the utility model; Figure 2 for Figure 1 As shown in the assembly diagram of the lower box. Figure 1 , Figure 2 As shown, the lower box includes a support frame 1, a bottom guard plate 2 and a tray 3. The bottom guard plate 2 and the support frame 1 enclose a receiving groove; the tray 3 is arranged in the receiving groove and connected to the support frame 1, and the tray 3 forms a battery module 7 receiving groove 301.

[0038] When in use, the bottom guard plate 2 is connected to one side of the support frame 1, so that the bottom guard plate 2 and the support frame 1 enclose the receiving groove, the tray 3 is set in the receiving groove, and the tray 3 is fixedly connected to the support frame 1, the receiving groove 301 on the tray 3 has an opening facing away from the bottom guard plate 2, the battery module 7 and electrical components and other components are placed in the receiving groove 301, the upper cover of the battery box covers the receiving groove 301, and is connected to the support frame 1 to assemble into a battery pack.

[0039] With the lower box of the utility model, the support frame 1 acts as a load-bearing structure, and the tray 3 seals the battery module 7 to ensure the airtightness of the battery pack. When subjected to a mechanical collision, even if the sealing of the support frame 1 fails, the sealing performance of the tray 3 will not be damaged, and the airtightness of the battery pack can still be ensured, thereby avoiding the airtightness failure of the battery pack after a collision, further reducing the risk of airtightness failure, and improving the safety performance of the battery pack.

[0040] like Figure 1 , Figure 2As shown, in this embodiment, the support frame 1 is a rectangular frame as a whole. The bottom guard plate 2 is a rectangular plate body, which matches the cross section of the support frame 1 and is bolted to the lower end face of the support frame 1. The tray 3 is arranged in the receiving groove enclosed by the support frame 1 and the bottom guard plate 2. The upper surface of the tray 3 is formed with the receiving groove 301. The cross section of the receiving groove 301 is a rectangle matching the cross section of the support frame 1. The battery module 7 and electrical components and other components are placed in the receiving groove 301. The tray 3 is connected to the support frame 1 by bonding with a high-strength structural adhesive. According to the actual application, the materials of the support frame 1, the bottom guard plate 2 and the tray 3 can be adjusted, the sizes of the three can be matched and adjusted, and the specific connection method between the support frame 1 and the bottom guard plate 2, and between the tray 3 and the support frame 1 can be adjusted.

[0041] Figure 3 for Figure 2 The cross-sectional view of the lower box body at A-A' is shown as Figure 3 As shown, optionally, the tray 3 extends a first flange 302 at the notch of the receiving groove 301 in a direction away from the receiving groove 301, and the first flange 302 is placed on the end of the support frame 1 facing away from the bottom guard plate 2, and is fixedly connected to the support frame 1. In this arrangement, by means of the cooperative connection between the first flange 302 and the support frame 1, the connection area between the tray 3 and the support frame 1 is increased, and the connection strength between the tray 3 and the support frame 1 is further improved.

[0042] like Figure 3 As shown, in this embodiment, the first flange 302 is placed on the upper end surface of the support frame 1, and the circumferential outer wall of the tray 3 and the first flange 302 are both bonded to the support frame 1 by high-strength structural adhesive. The shape and size of the first flange 302 can be adjusted according to actual application conditions.

[0043] Optionally, the tray 3 is integrally formed. The integral forming process can further ensure the airtightness of the tray 3. Specifically, a forming process such as steel stamping, aluminum stamping or composite material molding can be used.

[0044] Figure 4 for Figure 2 The schematic diagram of the connection relationship between the reinforcing plate 4 and the supporting frame 1 in the lower box is shown as follows: Figure 1 , Figure 4As shown, optionally, the lower box body further includes a reinforcing plate 4, which is connected to the end surface of the support frame 1 facing the bottom guard plate 2, and is connected to the outer wall of the tray 3 facing the bottom guard plate 2. The reinforcing plate 4 is added to strengthen the overall strength of the support frame 1 and provide further support for the tray 3 and the battery module 7 therein, thereby preventing the tray 3 from being subjected to excessive stress and cracking.

[0045] like Figure 1 , Figure 4 As shown, in this embodiment, there are two reinforcing plates 4, both of which are rectangular plates, parallel to each other, and spaced apart along the length extension direction of the support frame 1. The reinforcing plates 4 are made of the same material as the support frame 1. The opposite ends of the reinforcing plates 4 are welded to the two sides of the support frame 1 that are opposite to each other and face the end of the bottom guard plate 2, and are bonded to the outer wall of the tray 3 facing the bottom guard plate 2 through a high-strength structural adhesive. According to the actual application, the specific shape and size of the reinforcing plates 4, the number of settings, and the specific connection position with the support frame 1 facing the bottom guard plate 2 can be adjusted. The reinforcing plates 4 can be set along the width direction of the tray 3, along the length direction of the tray 3, or in a direction oblique to the length and width of the tray 3. As long as they are connected to the support frame 1 and the side of the tray 3 facing the bottom guard plate 2 at the same time, the strength of the support frame 1 can be improved and additional support can be provided for the tray 3.

[0046] Optionally, the lower box body further includes a crossbeam 5, the crossbeam 5 is arranged in the receiving groove 301, and the opposite ends of the crossbeam 5 are respectively fixedly connected to the inner wall of the tray 3. By providing the crossbeam 5, the structural strength of the tray 3 can be enhanced, and the receiving groove 301 in the tray 3 can be divided into a plurality of independent spaces for independently arranging a plurality of battery modules 7, thereby preventing the plurality of battery modules 7 from contacting and influencing each other.

[0047] like Figure 2 As shown, in this embodiment, a total of one crossbeam 5 is provided, and the opposite ends of the crossbeam 5 are vertically connected to the two long sides of the tray 3, dividing the accommodating groove 301 into two independent spaces, each of which can be provided with a battery module 7. The crossbeam 5 can be extruded from an aluminum profile, or can be formed by pultrusion of a composite material. Figure 4The two reinforcing plates 4 are arranged parallel to the cross beam 5 and are mirror-symmetrical about the cross beam 5. According to the actual application, the number of the cross beams 5 and the specific connection position with the tray 3 can be adjusted. The function of the cross beam 5 is to improve the structural strength of the tray 3 and divide the receiving slot 301 in the tray 3 into multiple independent spaces. The extension direction of the cross beam 5 does not limit its function. Therefore, the extension direction of the cross beam 5 is not limited and can be extended in any direction.

[0048] Optionally, the lower box body further comprises a transfer block 6, a first side surface of the transfer block 6 is connected to the inner wall of the tray 3, a second side surface of the transfer block 6 is connected to the cross beam 5, the first side surface and the second side surface are arranged opposite to each other, and the first side surface is arranged parallel to the inner wall of the tray 3, and the second side surface is arranged parallel to the end surface of the cross beam 5. The connection between the cross beam 5 and the inner wall of the tray 3 is realized by means of the transfer block 6, which increases the contact connection area between the two, and is conducive to improving the connection strength. The first side surface is arranged parallel to the inner wall of the tray 3, and the second side surface is arranged parallel to the end surface of the cross beam 5, which is conducive to smoothly connecting the transfer block 6 with the tray 3 and the cross beam 5.

[0049] Figure 5 for Figure 2 The schematic diagram of the structure of the transfer block in the lower box is shown; Figure 6 for Figure 2 The schematic diagram of the cross beam 5 in the lower box body being connected to the tray 3 by means of the adapter block 6 is shown. Figure 5 , Figure 6 As shown, optionally, the cross beam 5 is provided with a weight-reducing hole along the extension direction; the adapter block 6 includes a first connection portion 601 and a second connection portion 602, the first connection portion 601 is inserted into the weight-reducing hole, and is bonded to the inner wall of the cross beam 5, the side surface of the second connection portion 602 facing the first connection portion 601 is abutted against the end surface of the cross beam 5, and the side surface of the second connection portion 602 facing away from the first connection portion 601 is bonded to the inner wall of the tray 3. Providing the weight-reducing hole can reduce the overall weight of the lower box body, and then reduce the overall weight of the battery pack, which is beneficial to improving the endurance of the electric vehicle. Bonding the outer wall of the first connection portion 601 to the inner wall of the cross beam 5 is beneficial to further increase the connection area between the adapter block 6 and the cross beam 5 and improve the connection strength. Figure 5 and Figure 6As shown, in this embodiment, the adapter block 6 includes a first connection part 601 on the left and a second connection part 602 on the right. The cross-sectional area of ​​the first connection part 601 is smaller than that of the second connection part 602 and matches the size of the weight-reducing hole of the beam 5. The outer wall of the first connection part 601 is coated with structural glue and inserted into the weight-reducing hole of the beam 5 until the end of the beam 5 abuts against the side surface of the second connection part 602 facing the first connection part 601, that is, the second side surface of the adapter block 6, and the adhesive connection with the inner wall of the beam 5 is achieved by using structural glue. In order to further reduce weight, the first connection part 601 is set to a hollow structure. The side surface of the second connection part 602 facing away from the first connection part 601, that is, the first side surface of the adapter block 6, is coated with structural glue and bonded to the inner wall of the tray 3 to achieve the connection between the beam 5 and the tray 3. As shown Figure 3 As shown, due to the molding process, the side wall of the tray 3 is not vertically arranged, but at a certain inclined angle, in order to match the inclined surface of the inner wall of the tray 3, as shown in FIG. Figure 5 As shown, the side surface of the second connection part 602 facing away from the first connection part 601 is inclined and parallel to the inner wall of the tray 3, so that the width of the second connection part 602 is gradually wide at the top and narrow at the bottom, so that after the second connection part 602 is bonded to the inner wall of the tray 3, the side surface of the second connection part 602 facing the first connection part 601 is a vertical surface, parallel to the end surface of the crossbeam 5, and then after the first connection part 601 is inserted into the weight-reducing hole of the crossbeam 5, the crossbeam 5 can be stably abutted against the second connection part 602. The crossbeam 5 and the inner wall of the tray 3 are bonded, so different material combinations can also be used, avoiding the use of welding connection mode and having to use the same material, and achieving the best comprehensive cost and lightweight. According to actual application conditions, the specific shapes and sizes of the first connection part 601 and the second connection part 602 can be adjusted, and the inclination angle of the side surface of the second connection part 602 facing away from the first connection part 601 is adjusted with the inclination angle of the inner wall of the tray.

[0050] Optionally, the bottom guard plate 2 is formed with an escape groove 201 in a direction away from the tray 3, and a second flange 202 is extended from the notch of the escape groove 201 in a direction away from the escape groove 201, and the second flange 202 is detachably connected to the support frame 1. In this arrangement, when the second flange 202 is connected to the support frame 1 by means of an external connecting member, due to the protruding arrangement of the escape groove 201, the height of the external connecting member is smaller than the groove bottom of the escape groove 201, thereby ensuring that the bottom surface of the lower box body is a large plane as a whole, which is convenient for connection with the vehicle body.

[0051] like Figure 3As shown, in this embodiment, the bottom guard plate 2 bulges downward to form the avoidance groove 201, and the circumference of the notch of the avoidance groove 201 extends a second flange 202 in a direction away from the avoidance groove 201, and the second flange 202 abuts against the lower end surface of the support frame 1, and the bolts pass through the second flange 202 and the support frame 1 in sequence to achieve a detachable connection between the bottom guard plate 2 and the support frame 1. Because the avoidance groove 201 protrudes downward, after the bolts pass through the second flange 202 and the support frame 1, they will not protrude from the plane where the bottom of the avoidance groove 201 is located. The bottom guard plate 2 is an integrated stamping structure.

[0052] Optionally, the support frame 1 includes two end plates 101 arranged opposite to each other and two side plates 103 arranged opposite to each other, the adjacent end plates 101 are welded to the side plates 103, the side plates 103 extend a third flange 102 in a direction away from the receiving slot, the third flange 102 is provided with a mounting hole, and the side plates 103 are arranged parallel to the surface of the side facing the tray 3. In this arrangement, the third flange 102 is connected to the vehicle body through a connector, the connection area between the support frame 1 and the vehicle body is increased, and the connection stability is improved, and the side plates 103 are arranged parallel to the side facing the tray 3, which is conducive to achieving a smooth connection between the two.

[0053] like Figure 1-3 As shown, in this embodiment, the end plate 101 is arranged along the width direction of the support frame 1, and the side plate 103 is arranged along the length direction of the support frame 1. The end plate 101 and the side plate 103 can be aluminum profiles or rolled steel. The adjacent end plates 101 and the side plates 103 are welded and connected. The two side plates 103 extend the third flange 102 in the direction away from the receiving groove. The side wall of the tray 3 is inclined, and the side plate 103 is arranged parallel to the surface of the side facing the tray 3. Structural adhesive is applied between the two to achieve adhesive connection. The specific shape and size of the third flange 102 can be adjusted, and the specific position of the side plate 103 extending from the third flange 102 can also be adjusted. The connecting piece passes through the mounting hole on the third flange 102 and the vehicle body to achieve the connection between the lower box and the vehicle body.

[0054] Figure 7 for Figure 2 A schematic diagram of the installation process of the tray and the support frame in the lower box is shown; Figure 8 for Figure 2 The schematic diagram of the installation process of the crossbeam and the tray in the lower box is shown; Fig. 9 for Figure 2 A schematic diagram of the installation process of the bottom guard plate and the support frame in the lower box body is shown; Fig.10 For Figure 2The process diagram of placing the battery module in the lower box is shown below. Figure 7-Figure 10 The assembly process of the lower box is further introduced:

[0055] First, the support frame 1 is welded, and the adjacent end plates 101 and side plates 103 are welded together, for example, by argon arc welding, and the reinforcing plate 4 is welded to the end face of the support frame 1 facing away from the tray 3, and then the tray 3 is bonded to the reinforcing plate 4 and the support frame 1 by structural adhesive, and then the ends of the opposite ends of the crossbeam 5 are respectively bonded to the first connecting portion 601 of a transfer block 6, and the second connecting portion 602 of each transfer block 6 is bonded to the inner wall of the tray 3, and finally the bottom guard plate 2 is screwed to the side of the reinforcing plate 4 connected to the support frame 1 to complete the assembly of the lower box. After the lower box is assembled, multiple battery modules 7 are placed in the receiving groove 301 of the tray 3, and the crossbeam 5 divides the receiving groove 301 into multiple independent spaces, and each battery module 7 is arranged in an independent space.

[0056] The utility model also provides a battery box, comprising an upper cover and a lower box body as described in any of the above embodiments, wherein the upper cover covers the receiving groove 301 of the lower box body and is detachably connected to the supporting frame 1 of the lower box body.

[0057] With the battery box of the utility model, the support frame 1 acts as a load-bearing structure, and the tray 3 seals the battery module 7 to ensure the airtightness of the battery pack. When subjected to a mechanical collision, even if the sealing of the support frame 1 fails, the sealing performance of the tray 3 will not be damaged, and the airtightness of the battery pack can still be ensured, thereby avoiding the airtightness failure of the battery pack after a collision, further reducing the risk of airtightness failure, and improving the safety performance of the battery pack.

[0058] The utility model further provides a battery pack, including a battery module 7 and a battery box as described in the above embodiment, wherein the battery module 7 is arranged in a receiving groove 301 of the battery box.

[0059] With the battery pack of the utility model, the support frame 1 acts as a load-bearing structure, and the tray 3 seals the battery module 7 to ensure the airtightness of the battery pack. When subjected to a mechanical collision, even if the sealing of the support frame 1 fails, the sealing performance of the tray 3 will not be damaged, and the airtightness of the battery pack can still be ensured, thereby avoiding the airtightness failure of the battery pack after a collision, further reducing the risk of airtightness failure, and improving the safety performance of the battery pack.

[0060] The utility model also provides a vehicle, comprising the battery pack described in the above embodiment.

[0061] In the vehicle of the utility model, the support frame 1 acts as a load-bearing structure, and the tray 3 seals the battery module 7 to ensure the airtightness of the battery pack. When subjected to a mechanical collision, even if the sealing of the support frame 1 fails, the sealing performance of the tray 3 will not be damaged, and the airtightness of the battery pack can still be ensured, thereby avoiding the airtightness failure of the battery pack after a collision, further reducing the risk that may be caused by airtightness failure, and improving the safety performance of the battery pack.

[0062] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0063] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A lower box, characterized in that: include: Support frame; A bottom guard plate, wherein the bottom guard plate and the support frame enclose a receiving groove; A tray is disposed in the receiving groove and connected to the supporting frame, and the tray is formed with a battery module receiving groove.

2. The lower box according to claim 1, characterized in that: The tray extends a first flange at the notch of the accommodating groove in a direction away from the accommodating groove. The first flange is placed on an end of the supporting frame facing away from the bottom guard plate and is fixedly connected to the supporting frame.

3. The lower box according to claim 1 or 2, characterized in that: The tray is integrally formed.

4. The lower box according to claim 1 or 2, characterized in that: Also includes: A reinforcing plate is connected to the end surface of the supporting frame facing the bottom guard plate, and is connected to an outer wall of one side of the tray facing the bottom guard plate.

5. The lower box according to claim 1 or 2, characterized in that: Also includes: A crossbeam is disposed in the accommodating groove, and opposite ends of the crossbeam are respectively fixedly connected to the inner wall of the tray.

6. The lower box according to claim 5, characterized in that: Also includes: An adapter block, wherein the first side surface of the adapter block is connected to the inner wall of the tray, the second side surface of the adapter block is connected to the cross beam, the first side surface and the second side surface are arranged opposite to each other, and the first side surface is arranged parallel to the inner wall of the tray, and the second side surface is arranged parallel to the end surface of the cross beam.

7. The lower box according to claim 6, characterized in that: The cross beam is provided with a weight-reducing hole along the extension direction; The adapter block includes a first connecting part and a second connecting part, the first connecting part is inserted into the weight-reducing hole and is adhesively connected to the inner wall of the beam, a side surface of the second connecting part facing the first connecting part abuts against the end surface of the beam, and a side surface of the second connecting part facing away from the first connecting part is adhesively connected to the inner wall of the pallet.

8. The lower box according to claim 1 or 2, characterized in that: The bottom guard plate is formed with an escape groove in a direction away from the tray, and a second flange is extended from the notch of the escape groove in a direction away from the escape groove, and the second flange is detachably connected to the support frame.

9. The lower box according to claim 1 or 2, characterized in that: The support frame includes two end plates arranged opposite to each other and two side plates arranged opposite to each other. The adjacent end plates are welded to the side plates. The side plates extend a third flange away from the accommodating groove. The third flange is penetrated by a mounting hole. The side plates are arranged parallel to the surface of the side facing the tray.

10. A battery box, comprising an upper cover, characterized in that: It also includes the lower box body according to any one of claims 1 to 9, wherein the upper cover covers the receiving groove of the lower box body and is detachably connected to the supporting frame of the lower box body.

11. A battery pack, comprising a battery module, characterized in that: It also includes the battery box as described in claim 10, wherein the battery module is arranged in a receiving groove of the battery box.

12. A vehicle, characterized in that: A battery pack comprising the battery pack of claim 11.

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