Battery box and battery pack

Abstract

The present invention provides a battery case and a battery pack, wherein the battery case includes a bottom plate and a side beam arranged at the edge of the bottom plate, and also includes a reinforcing beam, the reinforcing beam is connected to the inner side of the side beam, and in a first direction perpendicular to the extension direction of the reinforcing beam and perpendicular to the plane where the bottom plate is located, the reinforcing beam includes a main body and a connecting flange, the connecting flange is welded to the side beam, and along the first direction, the ratio of the height of the connecting flange to the height of the reinforcing beam is in the range of 1 / 2 to 1 / 12. The connecting flange is welded to the side beam, and the contact area between the connecting flange and the side beam is large, and the welding area is large, so that the reinforcing beam can be firmly welded to the side beam to prevent the two from detaching. Furthermore, by adjusting the height relationship between the connecting flange and the reinforcing beam, the connection strength between the reinforcing beam and the side beam can be guaranteed while the reinforcing beam has good extrusion strength.

Description

Technical Field

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

[0002] The battery pack is a key component of new energy vehicles. The battery pack includes a battery pack box and a battery group arranged in the battery pack box. The battery pack box includes a bottom plate and a side beam arranged at the edge of the bottom plate. In order to reduce the cost of the battery pack and facilitate processing, some battery packs use rolled or stamped side beams, but the strength of rolled or stamped side beams is lower than that of aluminum profiles, resulting in the overall strength of the battery pack failing to meet the collision extrusion requirements.

[0003] To solve this problem, some battery packs are equipped with reinforcing beams on the inner side of the rolled or stamped side beams, which are welded to the side beams to reinforce the overall strength of the battery pack. However, there is only a linear weld between the reinforcing beam and the side beam, and after a period of use, the reinforcing beam is prone to fall off from the side beam, causing the overall strength of the battery pack to weaken. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the reinforcing beam in the battery pack is easily detached from the side beam, thereby providing a battery box and a battery pack.

[0005] In order to solve the above problems, the present invention provides a battery box, including a bottom plate and a side beam arranged at the edge of the bottom plate, the bottom plate and the side beam form a storage space for accommodating batteries, and also includes a reinforcement beam, the reinforcement beam is connected to the inner side of the side beam facing the storage space, and the extension direction of the reinforcement beam is the same as the extension direction of the side beam, in a first direction perpendicular to the extension direction of the reinforcement beam and perpendicular to the plane of the bottom plate, the reinforcement beam includes a main body and a connecting flange, the connecting flange is welded to the side beam, and along the first direction, the ratio of the height of the connecting flange perpendicular to the bottom plate direction to the height of the reinforcement beam perpendicular to the bottom plate direction is in the range of 1 / 2 to 1 / 12.

[0006] The present invention has the following advantages:

[0007] Utilizing the technical solution of the present invention, the reinforcement beam includes a main body and a connecting flange, and the main body is used to strengthen the structure of the side beam, so that the battery box meets the collision extrusion requirements. The connecting flange is welded to the side beam, and the contact area between the connecting flange and the side beam is large, and the welding area is large, so that the reinforcement beam can be firmly welded to the side beam to prevent the two from detaching. Furthermore, by adjusting the height relationship between the connecting flange and the reinforcement beam, the connection strength between the reinforcement beam and the side beam can be guaranteed while the reinforcement beam has good extrusion strength. Therefore, the technical solution of the present invention solves the defect that the reinforcement beam in the battery pack in the prior art is easy to fall off from the side beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 A schematic diagram showing a bottom view of a battery pack of the present invention;

[0010] Figure 2 Shows Figure 1 Schematic diagram of the internal structure of the battery pack;

[0011] Figure 3 Shows Figure 2 Structural diagram of the middle reinforcement beam;

[0012] Figure 4 Shows Figure 2 Schematic diagram of the structure of the middle reinforcement beam and the side beam.

[0013] Description of reference numerals:

[0014] 10. Bottom plate; 20. Side beam; 21. Front beam; 30. Reinforcement beam; 31. Main body; 311. Buffer cavity; 312. First section; 313. Second section; 32. Connecting flange; 40. Electrical compartment. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] like Figures 1 to 4 As shown, an embodiment of a battery box according to the present application includes a bottom plate 10, a side beam 20 arranged at the edge of the bottom plate 10, and a reinforcing beam 30. Among them, the bottom plate 10 and the side beam 20 enclose a storage space, and the storage space is used to accommodate batteries (and electrical components). The reinforcing beam 30 is connected to the inner side of the side beam 20 facing the storage space, and the extension direction of the reinforcing beam 30 is the same as the extension direction of the side beam 20. In the first direction L1 perpendicular to the extension direction of the reinforcing beam 30 and perpendicular to the plane where the bottom plate 10 is located, the reinforcing beam 30 includes a main body 31 and a connecting flange 32, and the connecting flange 32 is welded to the side beam 20. And further, along the first direction L1, the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is in the range of 1 / 2 to 1 / 12. Among them, the height d1 of the connecting flange 32 and the height d2 of the reinforcing beam 30 both refer to the height in the direction perpendicular to the plane where the bottom plate 10 is located.

[0020] Using the technical solution of this embodiment, the reinforcement beam 30 includes a main body 31 and a connecting flange 32. The main body 31 is used to strengthen the structure of the side beam 20, so that the battery box meets the collision extrusion requirements. The connecting flange 32 is welded to the side beam 20, and the contact area and welding area between the connecting flange 32 and the side beam 20 are large, which can make the reinforcement beam 30 firmly welded to the side beam 20 to prevent the two from detaching. Furthermore, by adjusting the height relationship between the connecting flange 32 and the reinforcement beam 30, the connection strength between the reinforcement beam 30 and the side beam 20 can be guaranteed while making the reinforcement beam 30 have good extrusion strength. Therefore, the technical solution of this embodiment solves the defect that the reinforcement beam in the battery pack in the prior art is easy to fall off from the side beam.

[0021] like Figure 1 and Figure 2 As shown, in the battery box, the side beam 20 is arranged at the edge of the bottom plate 10, and the side beam 20 forms the frame structure of the battery box. The bottom plate 10 and the side beam 20 enclose a receiving space, and the receiving space is used to place battery packs, electrical components, etc.

[0022] Furthermore, in order to strengthen the side beam 20 so that the battery box meets the collision and extrusion strength requirements, the present embodiment further provides a reinforcement beam 30 in the battery box. The reinforcement beam 30 is provided at the inner side of the side beam 20 and is welded to the side beam 20 .

[0023] It should be noted that, in order to facilitate the description of the positional relationship between the components, this embodiment specifies a first direction L1 and a second direction L2. Figure 4 The first direction L1 is perpendicular to the extension direction of the reinforcing beam 30 and also perpendicular to the plane where the bottom plate 10 is located. The second direction L2 is Figure 4 In the left and right directions shown, the second direction L2 is perpendicular to the extension direction of the reinforcing beam 30 and is also parallel to the plane where the bottom plate 10 is located.

[0024] Of course, those skilled in the art can adjust the placement of the battery box in this example according to actual needs. Figure 4 The content shown should not be understood as limiting the placement of the battery box.

[0025] Combination Figure 3 and Figure 4It can be seen that in this embodiment, along the first direction L1, the reinforcing beam 30 includes a main body 31 and a connecting flange 32, and the main body 31 is arranged at the corner position of the side beam 20 and the bottom plate 10. The connecting flange 32 is arranged on the side of the main body 31 away from the bottom plate 10, and the connecting flange 32 is arranged close to the side beam 20, so that the connecting flange 32 can be fitted with the inner surface of the side beam 20, so that the connecting flange 32 can be welded to the side beam 20.

[0026] Furthermore, the main body 31 is used to reinforce the strength of the side beam 20. When the battery box is subjected to external pressure, the main body 31 bears the external pressure together, thereby improving the overall strength of the battery pack.

[0027] Furthermore, the connecting flange 32 is used to be welded to the side beam 20 , so as to fix the reinforcing beam 30 to the side beam 20 .

[0028] Combination Figure 4 It can be seen that the connecting flange 32 and the side beam 20 are in surface contact, thereby increasing the welding area between the reinforcing beam 30 and the side beam 20. Furthermore, multiple straight welds can be welded between the connecting flange 32 and the side beam 20, or multiple arrays of spot welding can be performed, thereby greatly improving the welding connection strength between the connecting flange 32 and the side beam 20, so that the reinforcing beam 30 is not easy to fall off from the side beam 20.

[0029] like Figure 4 As shown, along the first direction L1 , the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is in the range of 1 / 2 to 1 / 12.

[0030] The height d1 of the connecting flange 32 is Figure 4 The vertical dimension of the connecting flange 32, the height d1 of the reinforcing beam 30, is Figure 4 The vertical dimension of the entire middle reinforcement beam 30 (including the main body 31 and the connecting flange 32).

[0031] Furthermore, the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 should be neither too small nor too large. If the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is small, it means that the height d1 of the connecting flange 32 is smaller than the height d2 of the reinforcing beam 30, so the contact area between the connecting flange 32 and the side beam 20 is reduced, resulting in a reduced welding area, and the connection strength between the two cannot be guaranteed. If the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is large, it means that the height d1 of the connecting flange 32 is larger than the height d2 of the reinforcing beam 30, which reduces the size of the main body 31, and the compressive strength of the battery box cannot be guaranteed, and the reinforcement effect of the reinforcing beam 30 is weakened.

[0032] Therefore, preferably, the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is in the range of 1 / 2 to 1 / 12.

[0033] For example, the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 may be selected as 1 / 2, 1 / 4, 1 / 6, 1 / 8, 1 / 10 or 1 / 12.

[0034] Optionally, the side beam 20 is formed by roll forming, and the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is in the range of 1 / 3 to 1 / 10.

[0035] Specifically, when the side beam 20 is formed by roll forming, the strength of the side beam 20 is relatively weaker than the strength of the side beam formed by other processes, so there is a stronger reinforcement requirement for the reinforcing beam 30, or in other words, a higher strength requirement for the reinforcing beam 30.

[0036] Therefore, when the side beam 20 is formed by roll forming, it is necessary to adjust the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30. On the premise of ensuring the welding strength between the connecting flange 32 and the side beam 20, it is also necessary to further ensure that the main body 31 has a higher strength.

[0037] Therefore, preferably, when the side beam 20 is formed by roll forming, the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is in the range of 1 / 3 to 1 / 10.

[0038] For example, when the side beam 20 is roll-formed, the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 may be selected as 1 / 3, 1 / 4, 1 / 5, 1 / 6, 1 / 7, 1 / 8, 1 / 9 or 1 / 10.

[0039] like Figure 2 and Figure 4 As shown, optionally, the battery box includes an electrical compartment 40, the reinforcement beam 30 is disposed in the electrical compartment 40, and the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcement beam 30 is in the range of 1 / 4 to 1 / 6.

[0040] Specifically, the battery box includes a battery compartment and an electrical compartment 40, wherein the battery compartment is used to place the battery pack, and the electrical compartment 40 is used to place the electrical components. The busbars, jumper copper bars and other connectors connected to the battery pack are connected to the electrical components in the electrical compartment 40.

[0041] Furthermore, when the battery box is subjected to external pressure, the electrical compartment 40 is compressed and deformed to squeeze the electrical components, which can easily cause the electrical components to catch fire or even explode, and the structural strength of the circuit board and the electrical components is significantly lower than the strength of the battery pack, so it is necessary to set a reinforcing beam 30 inside the side beam 20 in the electrical compartment 40. In addition, the electrical compartment 40 has a stronger reinforcement requirement for the reinforcing beam 30, or in other words, the strength requirement of the reinforcing beam 30 in the electrical compartment 40 is higher.

[0042] Therefore, when the side beam 20 is set in the electrical compartment 40, it is necessary to further adjust the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcement beam 30. On the premise of ensuring the welding strength between the connecting flange 32 and the side beam 20, it is also necessary to ensure that the main body 31 has further higher strength.

[0043] Therefore, preferably, when the side beam 20 is disposed in the electrical compartment 40 , the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 is in the range of 1 / 4 to 1 / 6.

[0044] For example, when the side beam 20 is disposed in the electrical compartment 40 , the ratio of the height d1 of the connecting flange 32 to the height d2 of the reinforcing beam 30 may be selected as 1 / 4, 1 / 5 or 1 / 6.

[0045] like Figure 4 As shown, optionally, along the first direction L1 , a height d1 of the connecting flange 32 is in a range of 6 mm to 20 mm.

[0046] Such an arrangement ensures that a larger welding area is provided between the connecting flange 32 and the side beam 20 , thereby ensuring the connection strength between the connecting flange 32 and the side beam 20 .

[0047] For example, the height d1 of the connecting flange 32 can be selected to be 6 mm, 8 mm, 10 mm, 12 mm, 15 mm or 20 mm, etc.

[0048] like Figure 4 As shown, in the technical solution of this embodiment, the main body 31 includes a buffer cavity 311. The ratio of the thickness d3 of the profile of the main body 31 to the width d4 of the main body 31 along the second direction L2 perpendicular to the extension direction of the reinforcing beam 30 and parallel to the bottom plate 10 is in the range of 1 / 12 to 1 / 20.

[0049] Specifically, the buffer cavity 311 is used to buffer the impact force or pressure on the battery box in the second direction L2.

[0050] from Figure 4 It can be seen that the width d4 of the main body portion 31 is the size of the main body portion 31 along the horizontal direction.

[0051] Furthermore, the ratio of the thickness d3 of the profile of the main body 31 to the width d4 of the main body 31 should be neither too small nor too large. If the ratio of the thickness d3 of the profile of the main body 31 to the width d4 of the main body 31 is small, it means that the thickness d3 of the profile of the main body 31 is small relative to the width d4 of the main body 31, and the structural strength of the main body 31 cannot be guaranteed, so that the reinforcement effect of the reinforcement beam 30 is weakened. If the ratio of the thickness d3 of the profile of the main body 31 to the width d4 of the main body 31 is large, it means that the thickness d3 of the profile of the main body 31 is large relative to the width d4 of the main body 31, and the overly thick main body 31 will occupy the space of the buffer cavity 311, making the buffer effect worse and reducing the space utilization efficiency in the battery box. At the same time, an overly thick main body 31 is also difficult to achieve in terms of technology.

[0052] It can be seen that the ratio of the thickness d3 of the profile of the main body 31 to the width d4 of the main body 31 should be reasonably determined to strike a balance between the strength of the main body 31, the buffering effect of the buffer cavity 311, and the space utilization efficiency in the battery box.

[0053] Therefore, preferably, the ratio of the thickness d3 of the profile of the main body portion 31 to the width d4 of the main body portion 31 is in the range of 1 / 12 to 1 / 20.

[0054] For example, the ratio of the thickness d3 of the profile of the main body portion 31 to the width d4 of the main body portion 31 may be selected as 1 / 12, 1 / 14, 1 / 16, 1 / 18 or 1 / 20.

[0055] It should be noted that the reinforcement beam 30 in this embodiment is not limited to being set in the electrical compartment 40, and the reinforcement beam 30 can also be set in other positions in the battery box, including in the battery compartment, etc.

[0056] Furthermore, the buffer cavity 311 is a closed cavity surrounded by profiles. For example, the reinforcing beam 30 can be formed by rolling to form a closed cavity.

[0057] like Figure 3 and Figure 4 As shown, the main body 31 in this embodiment has a first section 312 and a second section 313 connected at an angle, and the inner spaces of the first section 312 and the second section 313 form a buffer cavity 311 .

[0058] Specifically, the first section 312 is vertically arranged relative to the inner side of the bottom plate 10, and the second section 313 is parallelly arranged relative to the inner side of the bottom plate 10, that is, the two form a substantially "L"-shaped structure, and the first section 312 and the second section 313 are vertically arranged. The connecting flange 32 is connected to the end of the first section 312 facing the side beam 20, and the connecting flange 32 is vertically arranged with the first section 312.

[0059] Furthermore, the bottom of the second section 313 is provided with a bottom edge folded toward the side beam 20, and the bottom edge is used to cooperate and position with the bottom plate 10. The end of the bottom edge has a flange bent away from the bottom plate 10, and the flange is used to cooperate and position with the bottom of the inner side of the side beam 20.

[0060] In this embodiment, the inner space of the first section 312 and the second section 313 forms a buffer cavity 311 . More specifically, the first section 312 , the second section 313 , the bottom edge and the side beam 20 form a buffer cavity 311 .

[0061] like Figure 2 As shown, in the technical solution of this embodiment, the side beam 20 includes a front beam 21 facing the front side of the vehicle, and one end of the reinforcement beam 30 facing the front beam 21 is welded to the front beam 21, thereby further strengthening the connection strength between the reinforcement beam 30 and the battery box.

[0062] Specifically, along the front-rear direction of the vehicle, the ends of the first section 312 and the second section 313 are both provided with flanges. Figure 3 As shown, toward the rear of the vehicle, the flanges of the first section 312 and the second section 313 are used for welding to a partition beam (used to separate the battery compartment and the electrical compartment 40), and toward the front of the vehicle, the flanges of the first section 312 and the second section 313 (not shown in the figure) are used for welding to the front beam 21, so that the front and rear ends of the reinforcement beam 30 in the electrical compartment 40 can be fixed, thereby strengthening the connection strength between the reinforcement beam 30 and the battery box.

[0063] like Figure 4 As shown, in the technical solution of this embodiment, the ratio of the profile thickness d5 of the reinforcement beam 30 to the profile thickness d6 of the edge beam 20 is in the range of 1 to 1.7.

[0064] Specifically, since the reinforcing beam 30 is formed by bending a sheet of material, the profile thickness d5 of the reinforcing beam 30 here is equal to the profile thickness d3 of the main body portion 31 mentioned above.

[0065] Furthermore, since the reinforcing beam 30 plays a role in reinforcing the structure, the profile thickness d5 of the reinforcing beam 30 should not be less than the profile thickness d6 of the side beam 20. That is, the ratio of the profile thickness d5 of the reinforcing beam 30 to the profile thickness d6 of the side beam 20 should be at least greater than 1.

[0066] Furthermore, the ratio of the profile thickness d5 of the reinforcing beam 30 to the profile thickness d6 of the side beam 20 should be neither too small nor too large. If the ratio of the profile thickness d5 of the reinforcing beam 30 to the profile thickness d6 of the side beam 20 is small, it means that the profile thickness d5 of the reinforcing beam 30 is small relative to the profile thickness d6 of the side beam 20, and the structural strength of the reinforcing beam 30 cannot be guaranteed, and the expected support strength of the reinforcing beam 30 cannot be achieved. If the ratio of the profile thickness d5 of the reinforcing beam 30 to the profile thickness d6 of the side beam 20 is large, it means that the profile thickness d5 of the reinforcing beam 30 is large relative to the profile thickness d6 of the side beam 20, and the overly thick reinforcing beam 30 will increase the overall weight of the battery box and occupy the space inside the battery box.

[0067] It can be seen that the ratio of the profile thickness d5 of the compression reinforcement beam 30 to the profile thickness d6 of the side beam 20 should be reasonably determined so as to strike a balance between the strength of the reinforcement beam 30 and the space utilization efficiency and weight in the battery box.

[0068] Therefore, preferably, the ratio of the profile thickness d5 of the reinforcing beam 30 to the profile thickness d6 of the edge beam 20 is in the range of 1 to 1.7.

[0069] For example, the ratio of the profile thickness d5 of the reinforcing beam 30 to the profile thickness d6 of the edge beam 20 may be selected as 1, 1.2, 1.4, 1.6 or 1.7.

[0070] like Figure 4 As shown, in the technical solution of this embodiment, along the first direction L1, the ratio of the height d2 of the reinforcement beam 30 to the height d7 of the side beam 20 is in the range of 0.5 to 0.8.

[0071] from Figure 4 It can be seen that the height d2 of the reinforcing beam 30 is the size of the reinforcing beam 30 (including the main body 31 and the connecting flange 32) in the vertical direction, and the height d7 of the side beam 20 is the size of the side beam 20 in the vertical direction.

[0072] Furthermore, the ratio of the height d2 of the reinforcing beam 30 to the height d7 of the side beam 20 should be neither too small nor too large. If the ratio of the height d2 of the reinforcing beam 30 to the height d7 of the side beam 20 is small, it means that the height d2 of the reinforcing beam 30 is small relative to the height d7 of the side beam 20, and the structural strength of the reinforcing beam 30 cannot be guaranteed, and the expected supporting strength of the reinforcing beam 30 cannot be achieved. If the ratio of the height d2 of the reinforcing beam 30 to the height d7 of the side beam 20 is large, it means that the height d2 of the reinforcing beam 30 is large relative to the height d7 of the side beam 20, and the higher reinforcing beam 30 will increase the overall weight of the battery box and occupy the space inside the battery box.

[0073] Therefore, preferably, the ratio of the height d2 of the reinforcing beam 30 to the height d7 of the edge beam 20 is in the range of 0.5 to 0.8.

[0074] For example, the ratio of the height d2 of the reinforcement beam 30 to the height d7 of the edge beam 20 may be selected as 0.5, 0.6, 0.7 or 0.8.

[0075] The present application also provides a battery pack. According to an embodiment of the battery pack of the present application, the battery pack includes a battery case and a battery group arranged in the battery case. The battery case is the above-mentioned battery case.

[0076] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery box, characterized in that: The invention comprises a bottom plate (10) and a side beam (20) arranged at the edge of the bottom plate (10), wherein the bottom plate (10) and the side beam (20) enclose a storage space for storing batteries, and further comprises a reinforcing beam (30), wherein the reinforcing beam (30) is connected to the inner side of the side beam (20) facing the storage space, and the extending direction of the reinforcing beam (30) is the same as the extending direction of the side beam (20), and the reinforcing beam (30) is perpendicular to the extending direction of the reinforcing beam (30) and perpendicular to the bottom plate. In a first direction (L1) of the plane where the bottom plate (10) is located, the reinforcing beam (30) comprises a main body (31) and a connecting flange (32), the connecting flange (32) being welded to the side beam (20), and along the first direction (L1), a ratio of a height (d1) of the connecting flange (32) perpendicular to the bottom plate (10) to a height (d2) of the reinforcing beam (30) perpendicular to the bottom plate (10) is in a range of 1 / 2 to 1 / 12.

2. The battery box according to claim 1, characterized in that: The side beam (20) is formed by roll forming, and the ratio of the height (d1) of the connecting flange (32) to the height (d2) of the reinforcing beam (30) is in the range of 1 / 3 to 1 / 10.

3. The battery box according to claim 1, characterized in that: The battery box comprises an electrical compartment (40), the reinforcing beam (30) is arranged in the electrical compartment (40), and the ratio of the height (d1) of the connecting flange (32) to the height (d2) of the reinforcing beam (30) is in the range of 1 / 4 to 1 / 6.

4. The battery box according to claim 1, characterized in that: Along the first direction (L1), a height (d1) of the connecting flange (32) is in the range of 6 mm to 20 mm.

5. The battery box according to claim 1, characterized in that: The main body (31) comprises a buffer cavity (311), and a ratio of a thickness (d3) of a profile of the main body (31) to a width (d4) of the main body (31) in a second direction (L2) perpendicular to an extension direction of the reinforcing beam (30) and parallel to the bottom plate (10) is in a range of 1 / 12 to 1 / 20.

6. The battery case according to claim 5, characterized in that: The buffer cavity (311) is a closed cavity surrounded by a profile, or the main body (31) comprises a first section (312) and a second section (313) connected at an angle, and the inner space of the first section (312) and the second section (313) surrounds the buffer cavity (311).

7. The battery box according to claim 1, characterized in that: The side beam (20) comprises a front beam (21) facing the front side of the vehicle, and one end of the reinforcing beam (30) facing the front beam (21) is welded to the front beam (21).

8. The battery box according to claim 1, characterized in that: The ratio of the profile thickness (d5) of the reinforcing beam (30) to the profile thickness (d6) of the edge beam (20) is in the range of 1 to 1.

7.

9. The battery box according to claim 1, characterized in that , along the first direction (L1), a ratio of a height (d2) of the reinforcing beam (30) to a height (d7) of the side beam (20) is in a range of 0.5 to 0.

8.

10. A battery pack, characterized in that: The invention comprises a battery box and a battery pack arranged in the battery box, wherein the battery box is the battery box according to any one of claims 1 to 9.

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