Battery box body and battery pack

Abstract

The utility model discloses a battery box body and a battery pack, and belongs to the technical field of batteries. According to the battery box body and the battery pack, the hoisting piece is used for fixing the battery pack and the vehicle body in the installation process of the battery pack, the hoisting piece is used for bearing most of the weight of the battery pack, the first welding seam between the hoisting piece and the edge beam is arranged in the groove, and the extension direction of the first welding seam is perpendicular to the stress direction of the hoisting piece; the fixing strength of the hoisting piece and the edge can be improved, so that the phenomenon that the first welding seam cracks due to load bearing is reduced, and the strength and the reliability of the battery box body are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery box and battery pack. Background Technology

[0002] With the increasing popularity of new energy vehicles, in order to meet the needs of more users, new energy battery packs need to continuously balance performance and cost to achieve the optimal cost while ensuring performance. In the cost reduction scheme of battery box, the side beams of the box frame, as the pioneers of the main load-bearing path, directly affect the overall mechanical performance of the battery pack.

[0003] To facilitate battery pack production and assembly, lifting lugs are typically installed on the side beams. In existing technologies, these lugs are mostly welded directly to the side of the side beam away from the battery. Due to their long cantilever, insufficient stiffness in these lugs can lead to a lower overall modal performance of the battery pack, and the weld at the connection between the lug and the side beam poses a significant risk of failure. Utility Model Content

[0004] The purpose of this utility model is to provide a battery box and battery pack that can not only improve the reliability of the battery box, but also reduce the weight and cost of the battery box.

[0005] To achieve the above objectives, the following technical solution is provided:

[0006] Battery housing, including:

[0007] A side beam and a mounting cavity enclosed by the side beam, wherein the side beam has a groove on the side facing away from the mounting cavity;

[0008] A lifting component, at least partially disposed within the groove, abutting against the bottom wall of the groove, the bottom wall of the groove being located on the side of the groove closest to the mounting cavity; along a first direction, at least one of the two sides of the lifting component abuts against and is welded to the side wall of the groove to form a first weld.

[0009] Compared with the prior art, the beneficial effects of the battery box of this utility model are as follows:

[0010] The lifting component is used to fix the battery pack to the vehicle body during battery pack installation. The lifting component bears most of the weight of the battery pack. The first weld between the lifting component and the side beam is located in the groove, and the extension direction of the first weld is perpendicular to the force direction of the lifting component. This can improve the fixing strength between the lifting component and the side, thereby reducing the occurrence of cracking of the first weld due to load, and improving the strength and reliability of the battery box.

[0011] To achieve the above objectives, a battery pack is also provided, including the battery housing, battery pack, base plate, and cover plate as described above. The base plate is located on one side of the mounting cavity opening and is fixed to the side beam to close the mounting cavity opening on that side. The battery pack is placed in the mounting cavity. The cover plate is located on the other side of the mounting cavity opening and is fixed to the side beam to close the mounting cavity opening on that side.

[0012] Compared with the prior art, the beneficial effects of the battery pack of this utility model are as follows:

[0013] By applying the above-mentioned battery housing, not only is the structural strength of the battery housing improved, which is conducive to increasing the main frequency of the battery pack along the first direction, but the weight and cost of the battery housing can also be reduced. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the battery box structure in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the first structure of the side beam in an embodiment of this utility model;

[0016] Figure 3 for Figure 2 Enlarged view of point A;

[0017] Figure 4 This is a schematic diagram of the second structure of the side beam in an embodiment of this utility model.

[0018] Figure label:

[0019] 100. Mounting cavity; 1. Side beam; 1a. First beam; 1b. Second beam; 1c. Third beam; 11. Groove; 111. Side wall; 112. Bottom wall; 12. First reinforcing flange; 2. Lifting component; 2a. First lifting part; 2a1. Connecting side; 2b. Second lifting part; 2c. Main body; 2d. Cover body; 21. Connecting flange; 31. First weld; 32. Second weld; 4a. First reinforcing member; 4b. Second reinforcing member; 41. Second reinforcing flange; 42. Reinforcing structure; 5. Sleeve; 51. Cylinder body; 52. Flange. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The embodiments of this utility model 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 utility model, and should not be construed as limiting this utility model.

[0027] like Figures 1-4 As shown, this embodiment provides a battery box and a battery pack. The battery pack includes a battery box, which includes a side beam 1 and an installation cavity 100 formed by the side beam 1, as well as a lifting member 2. The side beam 1 has a groove 11 on the side away from the installation cavity 100. The lifting member 2 is at least partially disposed in the groove 11, and the lifting member 2 abuts against the bottom wall 112 of the groove 11. The bottom wall 112 of the groove 11 is located on the side of the groove 11 near the installation cavity 100. Along a first direction, at least one side of the two sides of the lifting member 2 abuts against and welds to the side wall 111 of the groove 11 to form a first weld 31.

[0028] The battery pack also includes a battery pack, a base plate, and a cover plate. The base plate is located on one side of the opening of the mounting cavity 100 and is fixed to the side beam 1 to close the opening of the mounting cavity 100 on that side. The battery pack is placed in the mounting cavity 100. The cover plate is located on the other side of the opening of the mounting cavity 100 and is fixed to the side beam 1 to close the opening of the mounting cavity on that side.

[0029] In this embodiment, the battery box has a lifting member 2 used to fix the battery pack to the vehicle body during battery pack installation. The lifting member 2 is used to bear most of the weight of the battery pack. The first weld 31 between the lifting member 2 and the side beam 1 is located in the groove 11, and the extension direction of the first weld 31 is perpendicular to the force direction of the lifting member 2. This can improve the fixing strength between the lifting member 2 and the side beam 1, thereby reducing the occurrence of cracking of the first weld 31 due to load, and improving the strength and reliability of the battery box.

[0030] It should be noted that the battery box includes multiple side beams 1, which are connected end to end to form an installation cavity 100.

[0031] like Figure 1 As shown, in a specific embodiment of this utility model, four side beams 1 are provided, and the four side beams 1 are connected end to end to form a rectangular battery box. That is, the four side beams 1 are arranged in pairs, with the two side beams 1 in the same pair facing each other. Furthermore, only one pair of side beams 1 is provided with the aforementioned groove 11 and lifting component 2, while the other pair of side beams 1 is not provided with the aforementioned groove 11 and lifting component 2. This satisfies the lifting requirements and reduces the number of lifting components 2, thus reducing weight and cost.

[0032] Of course, in other embodiments, the above-mentioned groove 11 and lifting component 2 can also be provided on each side beam 1.

[0033] In some embodiments, multiple lifting components 2 are provided, and the multiple lifting components 2 are spaced apart along the axial direction of the side beam 1, thereby improving the stability and safety of the battery box.

[0034] like Figure 4 As shown, in some embodiments, along a second direction perpendicular to the first direction, the depth of the groove 11 is h, and the length of the first weld 31 located on any side of the lifting component 2 along the first direction is m1, with m1 / h ranging from 0.3 to 0.9. It should be noted that if the value of m1 / h is too small, the connection strength of the first weld 31 will be too low, leading to a decrease in the structural strength and installation stability of the lifting component 2, and an increase in the risk of failure of the lifting component 2. If the value of m1 / h is too large, it will reduce the processing efficiency of the battery box and increase costs. By limiting the value of m1 / h as described above, it is easier to further balance the performance and cost of the battery box; that is, the cost reduction can be achieved while ensuring that the structural strength and installation stability of the lifting component 2 meet the requirements.

[0035] Furthermore, the groove 11 extends along a third direction and penetrates the side beam 1, where the third direction is the length direction of the side beam 1; the third direction is perpendicular to the first direction and the second direction. That is to say, the sides of the lifting component 2 along the first and second directions perpendicular to the length direction of the side beam 1 abut against the groove wall of the groove 11, making the connection stability between the lifting component 2 and the side beam 1 higher.

[0036] In a specific embodiment of this utility model, the lifting component 2 abuts against the side wall 111 of the groove 11 on both sides along the first direction, thereby forming an I-shaped structure. This not only significantly improves the rigidity of the side beam 1, but also allows the lifting component 2 to be supported on both sides along the first direction, which is beneficial to further improve the structural strength and installation stability of the lifting component 2.

[0037] Furthermore, the lifting component 2 is welded and fixed at the contact points with the side wall 111 of the groove 11 on both sides along the first direction to form the first weld 31, which not only has high connection stability and is more reliable, but also facilitates operation.

[0038] Furthermore, the length of the first weld 31 located on both sides of the lifting component is m1, and the value of m1 / h ranges from 0.3 to 0.6. Since the lifting component 2 is welded and fixed at the abutment of the side wall 111 of the groove 11 on both sides along the first direction to form the first weld 31, compared with the lifting component 2 being welded and fixed at the abutment of the side wall 111 of the groove 11 on one side along the first direction to form the first weld, the connection stability between the lifting component 2 and the side beam 1 has been improved. Therefore, the value range of m1 / h can be appropriately reduced, which is beneficial to achieving the purpose of reducing costs while meeting the requirements of the structural strength and installation stability of the lifting component 2.

[0039] like Figures 2-3 As shown, in some embodiments, one end of the lifting component 2 located in the groove 11 is welded to the bottom wall 112 of the groove 11 to form a second weld 32. The welding fixing method not only has high connection stability and is more reliable, but also facilitates operation.

[0040] Furthermore, along the first direction, the length of the second weld 32 is m2, and the value of m2 / h ranges from 0.3 to 0.5. It should be noted that if the value of m2 / h is too small, the connection strength of the second weld 32 will be too low, leading to reduced structural strength and installation stability of the lifting component 2, and an increased risk of failure. If the value of m2 / h is too large, it will reduce the processing efficiency of the battery box and increase costs. By limiting the value of m2 / h as described above, it is easier to further balance the performance and cost of the battery box; that is, cost reduction can be achieved while ensuring that the structural strength and installation stability of the lifting component 2 meet the requirements.

[0041] In some embodiments, the lifting component 2 is provided with a connecting flange 21 at one end located in the groove 11. The connecting flange 21 is fixedly connected to the bottom wall 112 of the groove 11, thereby increasing the contact area between the lifting component 2 and the bottom wall 112 of the groove 11, which is beneficial to improving the connection stability between the lifting component 2 and the bottom wall 112 of the groove 11.

[0042] In a specific embodiment of the present invention, the lifting component 2 is provided with two connecting flanges 21 at one end located in the groove 11. The two connecting flanges 21 are respectively located on both sides of the lifting component 2 along the axial direction of the side beam 1. Both connecting flanges 21 are welded and fixed to the bottom wall 112 of the groove 11 to form two second welds 32. Both connecting flanges 21 are fixedly connected to the bottom wall 112 of the groove 11 by multiple bolts and other fasteners to further improve the connection stability between the end of the lifting component 2 located in the groove 11 and the bottom wall 112 of the groove 11.

[0043] like Figures 3-4 As shown, in some embodiments, a reinforcing member is provided at the opening of the groove. One end of the reinforcing member is connected to the lifting member 2, and the other end is connected to the side beam 1. The reinforcing member supports the lifting member 2 and the side beam 1 in the first direction. This not only improves the supporting effect of the side beam 1 on the lifting member 2 and enhances the structural strength and installation stability of the lifting member 2, but also improves the structural strength of the side beam 1, so that the battery box structure is more stable and more reliable.

[0044] For example, one end of the reinforcing member is welded and fixed to the lifting member 2, and the other end of the reinforcing member is welded and fixed to the side beam 1, which not only makes the operation convenient, but also ensures high connection stability.

[0045] In some embodiments, both ends of the reinforcing member are provided with second reinforcing flanges 41. The two ends of the reinforcing member are connected to the lifting member 2 and the side beam 1 respectively through the second reinforcing flanges 41, thereby increasing the contact area between the reinforcing member and the lifting member 2, as well as between the reinforcing member and the side beam 1, which is beneficial to improving the connection stability between the reinforcing member and the lifting member 2, as well as between the reinforcing member and the side beam 1.

[0046] It is understood that the lifting component 2 includes a first lifting part 2a located inside the groove 11 and a second lifting part 2b located outside the groove 11, with the first lifting part 2a and the second lifting part 2b being fixedly connected.

[0047] In some embodiments, the connection between the reinforcing member and the lifting member 2 is located outside the groove 11. That is, one end of the reinforcing member is connected to the second lifting part 2b and the other end is connected to the side beam 1. This not only increases the structural strength of the second lifting part 2b to improve the stability of the battery box, but also reduces the stress at the connection between the first lifting part 2a and the side beam 1, further reducing the risk of separation between the lifting member 2 and the side beam 1.

[0048] In some embodiments, the connection between the reinforcing member and the side beam 1 is located at the opening of the groove 11, thereby providing support to the opening of the groove 11 through the reinforcing member to improve the structural strength of the side beam 1.

[0049] In some embodiments, the reinforcing member is provided with a reinforcing structure 42, thereby improving the structural strength and reliability of the reinforcing member.

[0050] Furthermore, the extension direction of the reinforcing structure 42 is a third direction, which is the length direction of the side beam 1; the third direction is perpendicular to the first and second directions. This arrangement can improve the strength of the reinforcing member in the first direction, increase the stress strength of the hoisting member 2 and the side beam 1 in the first direction, and improve the reliability of the battery box.

[0051] In some embodiments, the reinforcing structure 42 is a reinforcing rib formed by stamping, which is not only simple in structure and easy to process, but also low in cost and does not increase the weight of the battery box.

[0052] In some embodiments, multiple reinforcing ribs are provided, and the multiple reinforcing ribs are spaced apart along the first direction, which can further improve the strength of the reinforcing member in the first direction, increase the stress strength of the hoisting member 2 and the side beam 1 in the first direction, and improve the reliability of the battery box.

[0053] In some embodiments, along the axial direction of the side beam 1, the length of the reinforcing member is greater than the length of the lifting member 2, which can improve the supporting effect of the reinforcing member on the side beam 1, further improve the structural strength of the side beam 1, and thus help to further reduce the material used in the side beam 1.

[0054] like Figures 3-4As shown, in some embodiments, multiple lifting components 2 are provided, and the multiple lifting components 2 are spaced apart along the axial direction of the side beam 1, thereby improving the stability and safety of the battery box.

[0055] In some embodiments, the side beam 1 includes a first beam 1a, and a second beam 1b and a third beam 1c respectively connected to the two ends of the first beam 1a along a first direction. The second beam 1b and the third beam 1c are both located on the same side of the first beam 1a to form a groove 11 between the first beam 1a, the second beam 1b and the third beam 1c. The second beam 1b is a first tubular structure, which can reduce the weight and cost of the side beam 1 while ensuring the structural strength of the side beam 1.

[0056] In some embodiments, the third beam 1c is a second tubular structure, which can reduce the weight and cost of the side beam 1 while ensuring the structural strength of the side beam 1.

[0057] It is understandable that the axial direction of both the first tubular structure and the second tubular structure is parallel to the axial direction of the side beam 1.

[0058] In a specific embodiment of the present invention, the cross-section of both the first tubular structure and the second tubular structure is rectangular, which not only facilitates manufacturing but also provides high structural strength and stability. The cross-section of the first tubular structure is perpendicular to the axial direction of the side beam 1; the cross-section of the second tubular structure is also perpendicular to the axial direction of the side beam 1.

[0059] It should be noted that the shape and size of the cross-section of the first tubular structure and the cross-section of the second tubular structure may be the same or different, and no limitation is made here.

[0060] In some embodiments, the second beam 1b and / or the third beam 1c are provided with a first reinforcing flange 12 on the side facing the groove 11, and the first reinforcing flange 12 is fixedly connected to the first beam 1a. By increasing the contact area between the second beam 1b and / or the third beam 1c and the first beam 1a through the first reinforcing flange 12, not only can the structural strength of the first beam 1a, the second beam 1b, and the third beam 1c be improved, but the connection stability between the second beam 1b and / or the third beam 1c and the first beam 1a can also be improved.

[0061] In some embodiments, the first beam 1a, the second beam 1b, and the third beam 1c are integrally formed, which is beneficial to improving the structural strength of the side beam 1 and facilitating processing.

[0062] In a specific embodiment of the present invention, the first beam 1a, the second beam 1b, and the third beam 1c are integrally formed from a first steel plate by roll forming, resulting in high structural strength and ease of processing. For example, the thickness of the first steel plate is 1.2 mm, balancing the structural strength and cost of the side beam 1. Furthermore, both ends of the first steel plate are provided with first reinforcing flanges 12. After the first steel plate is roll-formed, both first reinforcing flanges 12 are fixedly connected to the first beam 1a by welding or fasteners to form the aforementioned side beam 1, thereby further improving the structural strength of the side beam 1.

[0063] In some embodiments, along the first direction, the height of the first lifting part 2a is greater than the height of the second lifting part 2b. On the one hand, the first lifting part 2a can provide sufficient support for the side beam 1, and on the other hand, while satisfying the structural strength of the lifting part 2, the weight and cost of the lifting part 2 can be reduced.

[0064] In some embodiments, along the first direction, the distance between the second lifting part 2b and the second beam 1b is greater than the distance between the second lifting part 2b and the third beam 1c, thereby reducing the stress on the lower end of the connection between the end of the lifting member 2 located in the groove 11 and the bottom wall 112 of the groove 11, as well as the connection between the lower side of the lifting member 2 and the side wall 111 of the groove 11, thus reducing the risk of separation between the lifting member 2 and the side beam 1.

[0065] Furthermore, the first lifting part 2a includes a connecting side surface 2a1 that is connected to the top surface of the second lifting part 2b. The angle between the connecting side surface 2a1 and the top surface of the second lifting part 2b is an obtuse angle, which not only facilitates the processing of the lifting part 2, but also helps to improve the strength of the second lifting part 2b.

[0066] In a specific embodiment of this utility model, along the first direction, the distance between the second hoisting part 2b and the second beam 1b is greater than the distance between the second hoisting part 2b and the third beam 1c. Further, the hoisting member 2 is provided with reinforcing members on both sides along the first direction; the reinforcing member located on the upper side of the hoisting member 2 is the first reinforcing member 4a, and the reinforcing member located on the lower side of the hoisting member 2 is the second reinforcing member 4b.

[0067] Furthermore, along the first direction, the height of the first reinforcing member 4a is greater than the height of the second reinforcing member 4b, thereby enabling the first reinforcing member 4a and the second reinforcing member 4b to match with the second hoisting part 2b, ensuring the supporting effect of the first reinforcing member 4a and the second reinforcing member 4b.

[0068] Furthermore, along the axial direction of the side beam 1, the length of the first reinforcing member 4a is equal to or slightly shorter than the length of the side beam 1. Since the height of the first reinforcing member 4a is relatively large along the first direction, by making the length of the first reinforcing member 4a equal to or slightly shorter than the length of the side beam 1 along the axial direction of the side beam 1, that is, by increasing the length of the first reinforcing member 4a, the supporting effect of the first reinforcing member 4a on the side beam 1 is improved.

[0069] Furthermore, along the axial direction of the side beam 1, the length of the second reinforcing member 4b is equal to or less than the width of the lifting member 2. Since the height of the first reinforcing member 4a is relatively small along the first direction, by making the length of the second reinforcing member 4b along the axial direction of the side beam 1 equal to or less than the width of the lifting member 2, the supporting effect of the second reinforcing member 4b can be guaranteed, and it is convenient to integrally form the second reinforcing member 4b with the lifting member 2, which facilitates processing.

[0070] In some embodiments, the lifting component 2 is a third tubular structure, which can reduce the weight and cost of the lifting component 2 while ensuring its structural strength. Specifically, the axial direction of the third tubular structure is perpendicular to the axial direction of the side beam 1, which helps to ensure the structural strength of the lifting component 2.

[0071] For example, the lifting component 2 is roll-formed into a third tubular structure using a second steel plate. It is understood that when the height of the first lifting part 2a is greater than the height of the second lifting part 2b along the first direction, the third tubular structure is a reducing pipe. Specifically, for ease of manufacturing, the third tubular structure includes a main body 2c and a cover 2d. The main body 2c is a U-shaped structure, and the cover 2d covers the opening of the U-shaped structure. The cover 2d and the main body 2c are fixedly connected by welding or other methods to form the aforementioned third tubular structure. Further, the main body 2c of the U-shaped structure is integrally formed using a second steel plate through roll forming, and the cover 2d is integrally formed using a second steel plate through roll forming.

[0072] It should be noted that the main body 2c and / or the cover 2d are provided with structures such as through grooves, which, while ensuring the strength of the third tubular structure, reduce the amount of material used, thereby reducing weight and cost.

[0073] In a specific embodiment of this utility model, the cross-section of the third tubular structure is rectangular, which not only facilitates manufacturing but also provides high structural strength and stability. The cross-section of the third tubular structure is perpendicular to its axial direction.

[0074] In some embodiments, the thickness of the second steel plate is greater than that of the first steel plate, thereby balancing the cost and reliability of the battery housing.

[0075] For example, the wall thickness of the third tubular structure is greater than 2 mm, which can balance the structural strength and cost of the lifting component 2. Preferably, the wall thickness of the third tubular structure is 2.5 mm, thereby making the lifting component 2 more reliable.

[0076] In some embodiments, the battery housing also includes a sleeve 5 disposed on the lifting member 2. The sleeve 5 is located on the side of the lifting member 2 away from the mounting cavity 100, thereby facilitating the connection of the lifting member 2 to the lifting equipment through the sleeve 5 and improving the convenience and safety of the lifting operation.

[0077] In a specific embodiment of this utility model, the sleeve 5 includes a cylinder body 51 and a flange 52 connected to the upper end of the cylinder body 51. The cylinder body 51 passes through the second lifting part 2b, and the flange 52 is fixed to the upper surface of the second lifting part 2b by welding or other means. The lower end of the cylinder body 51 is flush with the lower surface of the second lifting part 2b, thereby ensuring the installation stability of the sleeve 5.

[0078] In some embodiments, the minimum wall thickness of sleeve 5 is greater than the wall thickness of the third tubular structure, thereby balancing the cost and reliability of the battery housing. For example, sleeve 5 is made of 45# steel.

[0079] It should be noted that, by making the above-mentioned improvements to the side beam 1 and the lifting component 2, the battery box in this embodiment can reduce the material used in the side beam 1. In turn, without increasing the weight of the battery box, the material used in the lifting component 2 and the sleeve 5 can be increased, such as increasing the wall thickness of the third tubular structure and / or the wall thickness of the sleeve 5, so that the battery box can obtain better strength and reduce the risk of failure.

[0080] The battery pack of this embodiment, by applying the above-mentioned battery housing, not only improves the structural strength of the battery housing, which is conducive to increasing the main frequency of the battery pack along the first direction, but also reduces the weight and cost of the battery housing.

[0081] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery case, characterized by, The battery box body comprises: a side beam and a mounting cavity surrounded by the side beam, a groove being arranged on a side of the side beam away from the mounting cavity; a lifting piece arranged at least partially in the groove, the lifting piece abutting against a bottom wall of the groove, the bottom wall being located on a side of the groove close to the mounting cavity; in a first direction, at least one of the two sides of the lifting piece abuts against and is welded to a side wall of the groove to form a first weld.

2. The battery pack of claim 1, wherein, In a second direction perpendicular to the first direction, the depth of the groove is h, and the length of the first weld on either side of the lifting piece in the first direction is m1, and m1 / h is in the range of 0.3-0.

9.

3. The battery pack of claim 2, wherein, The groove extends through the side beam in a third direction, which is the length direction of the side beam; the third direction is perpendicular to the first direction and the second direction.

4. The battery pack of claim 1, wherein, Both sides of the lifting piece in the first direction abut against the side wall of the groove.

5. The battery pack of claim 4, wherein, Both sides of the lifting piece in the first direction are welded to and fixed with the side wall of the groove to form the first weld. In a second direction perpendicular to the first direction, the depth of the groove is h, and the length of the first weld on either side of the lifting piece in the first direction is m1, and m1 / h is in the range of 0.3-0.

6.

6. The battery pack of claim 1, wherein, The lifting piece and the bottom wall of the groove are fixedly connected by a second weld. In a second direction perpendicular to the first direction, the depth of the groove is h; in the first direction, the length of the second weld is m2, and m2 / h is in the range of 0.3-0.

5.

7. The battery pack of claim 1, wherein, The opening of the groove is provided with a reinforcing piece, one end of the reinforcing piece being connected with the lifting piece, and the other end being connected with the side beam.

8. The battery pack of claim 7, wherein, The reinforcing piece is provided with a reinforcing structure.

9. The battery pack of claim 8, wherein, The extending direction of the reinforcing structure is the third direction, which is the length direction of the side beam; the third direction is perpendicular to the first direction.

10. The battery pack of claim 1, wherein, The battery box body further comprises a sleeve arranged on the lifting piece, the sleeve being located on a side of the lifting piece away from the mounting cavity.

11. The battery pack of any one of claims 1-10, wherein, The side beam comprises a first beam body, and a second beam body and a third beam body connected to the two ends of the first beam body in the first direction respectively, the second beam body and the third beam body being located on the same side of the first beam body to form the groove between the first beam body, the second beam body and the third beam body; The second beam body is a first tubular structure; and / or, the third beam body is a second tubular structure.

12. The battery pack of claim 11, wherein, The second beam body and / or the third beam body is provided with a first reinforcing flange on a side facing the groove, the first reinforcing flange being fixedly connected with the first beam body.

13. The battery pack of claim 11, wherein, The lifting piece is a third tubular structure.

14. A battery pack, characterized by The battery box body, the battery pack, the bottom plate and the cover plate according to any one of claims 1-13, the bottom plate being located on a side of the mounting cavity opening and being fixed with the side beam to close the side opening of the mounting cavity, the battery pack being arranged in the mounting cavity, and the cover plate being located on the other side opening of the mounting cavity and being fixed with the side beam to close the side opening of the mounting cavity.

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