A battery pack edge beam structure, battery box and electrical equipment

Abstract

This application relates to a battery pack side beam structure, a battery box, and electrical equipment, belonging to the field of power battery technology. The battery pack side beam structure is connected to the top cover plate of the battery pack. The battery pack side beam structure includes a box beam body and a connecting plate. The box beam body includes an inner beam plate and an outer beam plate, which are connected and fixed together. The connecting plate is connected to one end of the box beam body near the top cover plate and extends away from the inner beam plate. The connecting plate has riveting holes. The outer beam plate is inclined towards the end of the connecting plate and has an inclined plate forming towards the inner beam plate. The inclined plate, the inner beam plate, and the connecting plate together enclose a connecting cavity with an opening on one side. The battery pack side beam structure provided by this application can solve the problems of high cost and easily affected sealing effect at the connection position between the side beam and the top cover in the battery pack box body in the prior art.

Description

Technical Field

[0001] This application relates to the field of power battery technology, specifically to a battery pack side beam structure, a battery box, and electrical equipment. Background Technology

[0002] When using a battery pack, the internal battery cell modules are usually encased in an outer casing, which serves to seal and protect the battery pack from the outside.

[0003] In existing technologies, battery packs are typically assembled by using side beams, a top cover, and a bottom plate to form a box-like structure, into which the battery cell modules are then assembled. During this process, the side beams are usually thin-walled structures, and they are typically connected to the top cover by forming a flange along the upper edge of the side beam, followed by riveting. Furthermore, to ensure a tight seal at the connection point, blind-hole rivet nuts are usually used for securing the connection.

[0004] However, during use, the aforementioned structure is susceptible to problems. Whether it's misalignment of the blind-hole rivet nut during installation or aging of the sealing ring after prolonged use, both will affect the overall sealing performance of the battery pack. Furthermore, blind-hole rivet nuts are more expensive than conventional connection structures, thus increasing the overall cost of the battery pack. Utility Model Content

[0005] The purpose of this application is to provide a battery pack side beam structure, a battery box, and electrical equipment, which can solve the problems of high cost and easy impact on sealing effect at the connection position between the side beam and the top cover in the battery pack box in the prior art.

[0006] To achieve the above objectives, in a first aspect, this application provides a battery pack side beam structure connected to the top cover plate of the battery pack. The battery pack side beam structure includes a box girder body and a connecting plate. The box girder body includes an inner beam plate and an outer beam plate, which are fixedly connected. The connecting plate is connected to one end of the box girder body near the top cover plate and extends towards the side away from the inner beam plate; the connecting plate has riveting holes. The outer beam plate is inclined towards the end of the connecting plate and has an inclined plate forming towards the inner beam plate. The inclined plate, the inner beam plate, and the connecting plate together enclose a connecting cavity with an opening on one side, and the riveting holes connect to the connecting cavity.

[0007] Based on the above embodiments of this application, during the processing and assembly of the battery pack's box structure, the side beams are configured as a double-layer box beam structure composed of inner and outer beam plates. This increases the strength of the battery pack's side beam structure compared to the thin-walled structure in the prior art, thereby improving the battery pack's box structure's resistance to impact and enhancing the protection of the internal cell modules. Simultaneously, during the process of connecting the side beams to form the box structure's side beams, the inner beam plate of the box beam body faces inwards towards the battery pack, and the outer beam plate faces outwards. Subsequently, the battery pack's cell modules are placed within the receiving structure formed by the box beam body. The connecting plate is provided with riveting holes for connection and fixation with the upper cover plate. When connecting through the riveting holes, the connecting structure passes through the riveting holes into the connecting cavity. Since the connecting cavity is enclosed outside the inner beam plate, the connecting structures are all located outside the receiving structure formed by the box beam structure. At this time, the riveting holes and corresponding connecting structures are independent of the receiving structure, and the cell modules are individually sealed and protected within the receiving structure. The connection structure between the battery pack side beam structure and the top cover plate does not affect the overall airtightness of the battery pack. Furthermore, by setting the inclined plate, a connecting cavity is formed in the main body of the box girder, thereby reducing material usage and thus lowering production and processing costs while ensuring the overall high structural strength of the box girder.

[0008] In some embodiments, a bevel is formed between the inclined plate and the connecting plate, and the bevel communicates with the connecting cavity. The width of the bevel between the inclined plate and the connecting plate is L1, where L1 ≥ 10 mm. The depth of the connecting cavity along the extending direction of the connecting plate is L2, where 5 mm ≤ L2 ≤ 50 mm.

[0009] Based on the embodiments described above, by forming a connecting cavity between the box girder body and the connecting plate, material usage can be reduced, thus lowering costs. Furthermore, it provides sufficient space for the connection structure between the connecting plate and the top cover plate, facilitating their riveting and fixing. Further, by limiting the width of the bevel opening and the depth of the connecting cavity, the space within the connecting cavity can be increased, providing ample space for the connecting structure. Additionally, it allows for easier welding of the battery pack side beam structure through methods such as welding.

[0010] In some embodiments, a communication opening is provided on the inner beam plate, the communication opening is located at the end of the inner beam plate, and the communication opening is located in the connecting cavity.

[0011] Based on the above embodiments of this application, by opening a connecting port on the inner beam plate, when the battery pack edge beam structure is fixed by welding, the weld can connect the inside and outside of the structure through the connection port, thereby strengthening the connection effect, ensuring airtightness, and simplifying the welding process of the battery pack edge beam structure.

[0012] In some embodiments, reinforcing ribs are provided between the inner beam and the outer beam.

[0013] Based on the embodiments described above, by providing reinforcing ribs between the inner and outer beams, the inner and outer beams are connected and fixed to form an integral box girder structure. Furthermore, the strength of the box girder body is enhanced, allowing the inner and outer beams to support each other. This strengthens the box girder body's resistance to external impacts and internal cell expansion pressure, thereby improving the protection of the battery pack's internal cell modules.

[0014] According to a second aspect of this application, a battery box is provided. The battery box includes a top cover and at least three side beams. At least one side beam is configured as the aforementioned battery pack side beam structure, and the side beams abut against each other to form a battery pack structural beam. The top cover is disposed on top of the battery pack structural beam to enclose a receiving cavity, and riveting holes are formed on the outside of the receiving cavity.

[0015] Based on the embodiments described above, during the processing and assembly of the battery box, multiple side beams are connected to form a battery pack structural beam. The specific number of side beams can be set according to the shape of the battery pack, typically four side beams can be set to enclose and form a rectangular battery pack structural beam. Simultaneously, some of the side beams can be configured as the aforementioned battery pack edge beam structure. Based on this configuration, the battery pack structural beam, together with the top cover plate, encloses a cavity to accommodate the battery cell module. The riveting holes and connecting structures are separately located outside the cavity. This not only reduces the impact of the connecting structure at the connection point with the top cover plate on the airtightness of the battery pack but also reduces material usage while strengthening the overall strength of the battery pack structural beam, thereby reducing costs.

[0016] In some embodiments, rivet nuts and fixing bolts are provided between the upper cover plate and the battery pack edge beam structure. The rivet nuts are fixed in the rivet holes, and the fixing bolts cooperate with the rivet nuts to fix the connecting plate and the upper cover plate. The rivet nuts are configured as through-hole rivet nuts.

[0017] Based on the embodiments described above, the battery pack side beam structure and the upper cover plate are fixed by using rivet nuts in conjunction with fixing bolts. Since the rivet holes and connecting structures are located outside the receiving cavity, the airtightness of the connecting structure does not affect the sealing performance of the receiving cavity or the battery pack as a whole. Therefore, the rivet nuts can be replaced by through-hole rivet nuts instead of blind-hole rivet nuts in the prior art, which reduces costs compared to blind-hole rivet nuts in the prior art.

[0018] In some embodiments, the inner beam plate is disposed on one side of the two battery pack side beam structures that are close to each other, and the opening direction of the ramp is facing away from the receiving cavity.

[0019] Based on the above embodiments of this application, during the process of the box girder body enclosing and forming the receiving cavity, the inner beam plate is set towards the receiving cavity, and at this time the connecting plate extends in the direction away from the receiving cavity, thereby setting the connecting cavity independently outside the receiving cavity, and further setting the connection structure between the connecting plate and the upper cover plate independently outside the receiving cavity, reducing the impact of the connection structure on the sealing performance of the receiving cavity and the battery pack as a whole.

[0020] In some embodiments, the box girder body is welded and fixed to the side beams. Specifically, the inner beam plate on the inner side of the box girder body is welded and fixed at the contact position with the side beams, and the outer beam plate, inner beam plate, and inclined plate on the outer side of the box girder body are all welded and fixed at the contact positions with the side beams.

[0021] Based on the embodiments described above, the inner and outer sides of the box girder body are welded and fixed to adjacent side beams. Compared to single-sided welding, this not only strengthens the connection at the welded positions but also further improves the sealing effect, thereby enhancing the overall airtightness of the cavity. Furthermore, when welding the outer side of the box girder body to the side beams, not only the contact points between the outer beam plate and adjacent side beams need to be welded and fixed, but also the contact points between the inclined plate and the inner beam plate and adjacent side beams are welded and fixed, further enhancing the sealing effect.

[0022] In some embodiments, the connecting port is provided on the inner beam plate, and the connecting port can connect the connecting cavity and the receiving cavity before the side beam and the battery pack edge beam structure are welded and fixed.

[0023] Based on the above embodiments of this application, when the battery pack edge beam structure is welded and fixed to the adjacent side beam, the weld can connect the inside and outside of the structure through the connection port, thereby strengthening the connection effect, ensuring airtightness, and simplifying the overall welding process of the battery pack edge beam structure.

[0024] According to a third aspect of this application, an electrical appliance is provided. The electrical appliance includes a main body and the aforementioned battery box. A power supply cavity is provided inside the main body, and the battery box is disposed within the power supply cavity.

[0025] Based on the above embodiments of this application, the electrical equipment provided by this application includes the above-mentioned battery box, and therefore also has the above-mentioned beneficial effects. To avoid repetition, it will not be described again here.

[0026] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1This is a schematic diagram of the battery pack side beam structure provided in the embodiments of this application.

[0029] Figure 2 This is a plan view of the battery pack side beam structure provided in the embodiments of this application.

[0030] Figure 3 This is a schematic diagram of the battery box provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures

[0032] 2. Box girder main body; 21. Inner beam plate; 22. Outer beam plate; 23. Inclined plate; 24. Connecting cavity; 25. Sloping bevel; 26. Connecting opening; 27. Reinforcing rib; 3. Connecting plate; 4. Side beam; 41. Receiving cavity; 5. Rivet nut. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] 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.

[0037] In the description of this application, it should be noted that, unless otherwise stated, the terms "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In existing technologies, battery packs are typically assembled by using side beams, a top cover, and a bottom plate to form a box-like structure, into which the battery cell modules are then assembled. During this process, the side beams are usually thin-walled structures. The side beams are typically connected to the top cover by forming a flange along their upper edge, followed by riveting. To ensure a tight seal at the connection point, blind-hole rivet nuts are usually used for fixing; that is, one end of the rivet nut is closed to guarantee a tight seal.

[0040] However, in use, when the side beam and top cover are fixed together using blind-hole rivet nuts, the nuts are prone to misalignment during and after fixing. This can create gaps at the fixing points, affecting the airtightness of the battery pack. Furthermore, with prolonged use, the sealing rings or sealant on the blind-hole rivet nuts will age, also impacting the airtightness. Additionally, blind-hole rivet nuts are more expensive than conventional connection structures, increasing the overall cost of the battery pack.

[0041] To address the aforementioned problems in the prior art, according to a first aspect of this application, an embodiment of this application provides a battery pack side beam structure, which is connected to the upper cover plate of the battery pack. (Reference) Figure 1 and Figure 2As shown, the battery pack edge beam structure includes a box girder body 2 and a connecting plate 3. The box girder body 2 includes an inner beam plate 21 and an outer beam plate 22, with the inner beam plate 21 and the outer beam plate 22 connected and fixed. The connecting plate 3 is connected to one end of the box girder body 2 near the upper cover plate and extends toward the side away from the inner beam plate 21. The connecting plate 3 has rivet holes. The outer beam plate 22 is inclined toward the end of the connecting plate 3 and has an inclined plate 23 forming toward the inner beam plate 21. The inclined plate 23, the inner beam plate 21, and the connecting plate 3 together enclose a connecting cavity 24 with an opening on one side, and the rivet holes connect to the connecting cavity 24.

[0042] Based on the above embodiments of this application, when the battery pack box structure is processed and assembled, the side beam is set as a double-layer box beam structure composed of inner beam plate 21 and outer beam plate 22. Compared with the thin-walled structure in the prior art, the strength of the battery pack side beam structure itself is increased, thereby improving the battery pack box structure's resistance to impact and enhancing the protection effect on the internal cell modules.

[0043] Simultaneously, during the process of connecting the side beams to form the side beams 4 of the box structure, the inner beam plate 21 of the box beam body 2 faces the inside of the battery pack, and the outer beam plate 22 faces the outside of the battery pack. Subsequently, the battery cell modules of the battery pack are placed in the receiving structure formed by the box beam body 2. At this time, the connecting plate 3 is provided with riveting holes for connecting and fixing with the upper cover plate. When connecting through the riveting holes, the connecting structure passes through the riveting holes into the connecting cavity 24, thereby separating the connecting structure from the cell module through the box beam body 2. At this time, the riveting holes and the corresponding connecting structure are independent of the receiving structure, and the cell module is separately sealed and protected in the receiving structure. The connection structure between the battery pack side beam structure and the upper cover plate does not affect the airtightness of the cell module part.

[0044] Furthermore, by setting the inclined plate 23, a notch structure called the connecting cavity 24 is formed on the main body of the box girder 2, thereby reducing the amount of material used while ensuring the overall high structural strength of the main body of the box girder 2, thus reducing the production and processing costs.

[0045] Specifically, when the inclined plate 23 is installed, one end is connected to the end of the outer beam plate 22, and the other end is inclined towards the inner beam plate 21 and connected to the inner beam plate 21. Compared with a conventional rectangular box girder structure, this saves some material on the outer beam plate 22, thereby reducing costs. At the same time, a sealed space is formed inside the box girder body 2, while the riveting holes are located outside the sealed space, further reducing the impact on the overall airtightness of the battery pack.

[0046] refer to Figure 2As shown, in some embodiments of this application, a chamfer 25 may be formed between the inclined plate 23 and the connecting plate 3, and the chamfer 25 connects to the connecting cavity 24. The width of the chamfer 25 between the inclined plate 23 and the connecting plate 3 is L1, where L1 ≥ 10 mm. The depth of the connecting cavity 24 along the extending direction of the connecting plate 3 is L2, where 5 mm ≤ L2 ≤ 50 mm.

[0047] Based on the embodiments described above, by forming a connecting cavity 24 between the box girder body 2 and the connecting plate 3, the amount of material used can be reduced, thus lowering costs. Furthermore, it provides sufficient space for the connection structure between the connecting plate 3 and the upper cover plate, facilitating their riveting and fixing. Further, by limiting the width of the opening of the bevel 25 and the depth of the connecting cavity 24, the space of the connecting cavity 24 can be increased, providing sufficient space for the connecting structure. Additionally, it facilitates welding by fixing the battery pack side beam structure as a whole through methods such as welding.

[0048] Specifically, the "width L1 of the bevel 25 between the inclined plate 23 and the connecting plate 3" mentioned above in this application refers to the width of the opening position of the bevel 25 between the end of the inclined plate 23 and the end of the connecting plate 3. In practical use, the width of the opening position of the bevel 25 can be set to multiple specific values ​​such as 10mm, 12mm, and 15mm. Similarly, the "depth L2 of the connecting cavity 24 along the extension direction of the connecting plate 3" mentioned above in this application refers to the horizontal distance of the connecting cavity 24 from the inner beam plate 21 to the outermost side. By limiting the depth of the connecting cavity 24, sufficient space is left for the connection structure between the connecting plate 3 and the upper cover plate. In practical use, the depth of the connecting cavity 24 can be set to multiple specific values ​​including 5mm, 10mm, 20mm, 30mm, 40mm, and 50mm, and this application does not impose specific limitations on this.

[0049] refer to Figure 1 and Figure 2 As shown in some embodiments of this application, a communication port 26 may be provided on the inner beam plate 21. The communication port 26 is provided at the end of the inner beam plate 21 and is located in the connecting cavity 24.

[0050] Based on the above embodiments of this application, by opening a connecting port 26 on the inner beam plate 21, when the battery pack edge beam structure is fixed by welding, the weld can connect the inside and outside of the structure through the connection port, thereby strengthening the connection effect, ensuring airtightness, and simplifying the welding process of the battery pack edge beam structure.

[0051] In this application, the specific structure of the box girder body 2 can be selected in any suitable manner.

[0052] refer to Figure 1 and Figure 2As shown in some embodiments of this application, a reinforcing rib 27 may be provided between the inner beam plate 21 and the outer beam plate 22.

[0053] Based on the above embodiments of this application, by providing reinforcing ribs 27 between the inner beam plate 21 and the outer beam plate 22, the inner beam plate 21 and the outer beam plate 22 are connected and fixed to form an integral box girder structure. On the other hand, the strength of the box girder body 2 is also enhanced, so that the inner beam plate 21 and the outer beam plate 22 support each other, thereby making the box girder body 2 more resistant to external impact forces and internal cell expansion pressure, and thus improving the protection effect on the battery cell modules inside the battery pack.

[0054] Furthermore, in the specific design of the box girder body 2, a cavity structure is formed between the inner beam plate 21 and the outer beam plate 22. Through the installation of reinforcing ribs 27, multiple reinforcing ribs 27 work together to further separate the cavity structure between the inner beam plate 21 and the outer beam plate 22, dividing the cavity structure into multiple independent small cavities. Therefore, even if the box girder body 2 is partially damaged due to external impact, other parts can still maintain a certain degree of airtightness.

[0055] Specifically, the number, size, and arrangement of the reinforcing ribs 27 can be set according to the specific working conditions of the battery pack. For example, when the battery pack is used in a harsh working environment with significant external impact, the size and number of reinforcing ribs 27 can be increased accordingly, making the arrangement of the reinforcing ribs 27 more dense, thereby improving the supporting effect of the reinforcing ribs 27 between the inner beam plate 21 and the outer beam plate 22.

[0056] Based on the above technical solution, and according to the second aspect of this application, a battery box is provided. (Reference) Figures 1 to 3 As shown, the battery box includes a top cover (not shown) and at least three side beams 4. At least one side beam 4 is configured as the battery pack side beam structure described above. The side beams 4 abut against each other to form a battery pack structural beam. The top cover is placed over the battery pack structural beam to enclose a receiving cavity 41. Riveting holes are formed on the outside of the receiving cavity 41.

[0057] Based on the above embodiments of this application, during the processing and assembly of the battery box, multiple side beams 4 are connected to form a battery pack structural beam. The specific number of side beams 4 can be set according to the shape of the battery pack; typically, four side beams 4 can be set to enclose and form a rectangular battery pack structural beam. Simultaneously, the side beams 4 can be partially configured as the aforementioned battery pack edge beam structure. Based on this configuration, the battery pack structural beam, together with the upper cover plate, encloses and forms a receiving cavity 41 to accommodate the battery cell module. The riveting holes and connecting structures are separately located outside the receiving cavity 41. This not only reduces the impact of the connecting structure at the connection point with the upper cover plate on the airtightness of the battery pack but also reduces material usage while strengthening the overall strength of the battery pack structural beam, thereby reducing costs.

[0058] Specifically, during the manufacturing and assembly of the battery box, since the cell modules are typically designed as relatively square cubic structures, four side beams 4 can be provided. These four side beams 4 are connected sequentially to form a rectangular battery pack structural beam. In this case, one, two, three, or all four of the four side beams 4 can be configured as the aforementioned battery pack side beam structure.

[0059] Meanwhile, considering the uniformity of the overall strength of the battery pack structural beams, it is preferable to select two or four of the four side beams 4 to be configured as the aforementioned battery pack edge beam structure. When two of the four side beams 4 are configured as the aforementioned battery pack edge beam structure, the two battery pack edge beam structures are symmetrically arranged, thereby making the overall strength of the connected battery pack structural beams more uniform. In this case, the remaining two side beams 4 can be configured as any suitable structure; for example, the remaining two side beams 4 can be configured as box beam structures. The specific configuration can be determined based on actual strength requirements and other factors, and this application does not impose specific restrictions in this regard. Similarly, when all four side beams 4 are configured as the aforementioned battery pack edge beam structure, the four side beams 4 are symmetrically arranged in pairs, thereby making the overall strength of the battery pack structural beams more uniform.

[0060] refer to Figure 3 As shown in some embodiments of this application, a rivet nut 5 and a fixing bolt are provided between the upper cover plate and the battery pack side beam structure. The rivet nut 5 is fixed in the rivet hole, and the fixing bolt cooperates with the rivet nut 5 to fix the connecting plate 3 and the upper cover plate. The rivet nut 5 is a through-hole rivet nut 5.

[0061] Based on the embodiments described above, the battery pack side beam structure and the upper cover plate are fixed by using rivet nuts 5 in conjunction with fixing bolts. Since the riveting holes and connecting structures are located outside the receiving cavity 41, the airtightness of the connecting structures will not affect the sealing performance of the receiving cavity 41 or the battery pack as a whole. Therefore, the rivet nuts 5 can be replaced by through-hole rivet nuts 5 instead of blind-hole rivet nuts 5 in the prior art, which can reduce costs compared to blind-hole rivet nuts 5 in the prior art.

[0062] refer to Figures 1 to 3 As shown in some embodiments of this application, the inner beam plate 21 is disposed on the side of the two battery pack side beam structures that are close to each other, and the opening direction of the ramp 25 is towards the side away from the receiving cavity 41.

[0063] Based on the above embodiments of this application, during the process of the box girder body 2 enclosing and forming the receiving cavity 41, the inner beam plate 21 is positioned towards the receiving cavity 41. At this time, the connecting plate 3 extends in a direction away from the receiving cavity 41, thereby independently setting the connecting cavity 24 outside the receiving cavity 41. This further allows the connection structure between the connecting plate 3 and the upper cover plate to be independently set outside the receiving cavity 41, reducing the impact of the connection structure on the sealing performance of the receiving cavity 41 and the battery pack as a whole.

[0064] refer to Figure 3 As shown in some embodiments of this application, the box girder body 2 is welded and fixed to the side beams 4. Specifically, the inner beam plate 21 on the inner side of the box girder body 2 is welded and fixed to the side beams 4 at the contact position, and the outer beam plate 22, inner beam plate 21, and inclined plate 23 on the outer side of the box girder body 2 are all welded and fixed to the side beams 4 at the contact positions.

[0065] Based on the embodiments described above, the inner and outer sides of the box girder body 2 are welded and fixed to the adjacent side beams 4. Compared to single-sided welding, this not only strengthens the connection at the welded position but also further improves the sealing effect, thereby enhancing the overall airtightness of the accommodating cavity 41. Furthermore, when welding and fixing the outer side of the box girder body 2 to the side beams 4, not only the contact positions of the outer beam plate 22 and the adjacent side beams 4 need to be welded and fixed, but the contact positions of the inclined plate 23 and the inner beam plate 21 with the adjacent side beams 4 are also welded and fixed, thereby further enhancing the sealing effect.

[0066] refer to Figure 1 and Figure 2 As shown in some embodiments of this application, the connecting port 26 is provided on the inner beam plate 21, and the connecting port 26 can connect the connecting cavity 24 and the receiving cavity 41 before the side beam 4 is welded and fixed to the battery pack edge beam structure.

[0067] Based on the above embodiments of this application, when the battery pack edge beam structure is welded and fixed to the adjacent side beam 4, the weld can connect the inside and outside of the structure through the connection port, thereby strengthening the connection effect, ensuring airtightness, and simplifying the overall welding process of the battery pack edge beam structure.

[0068] According to a third aspect of this application, an electrical appliance is provided. The electrical appliance includes a main body and the aforementioned battery box. A power supply cavity is provided inside the main body, and the battery box is disposed within the power supply cavity.

[0069] In this application, the electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0070] Based on the above embodiments of this application, the electrical equipment provided by this application includes the above-mentioned battery box, and therefore also has the above-mentioned beneficial effects. To avoid repetition, it will not be described again here.

[0071] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0072] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0073] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

Claims

1. A battery pack edge beam structure connected with an upper cover plate of a battery pack, characterized by, The battery pack edge beam structure includes: The box girder body includes an inner beam plate and an outer beam plate, wherein the inner beam plate and the outer beam plate are connected and fixed together; A connecting plate is attached to one end of the box girder body near the upper cover plate and extends toward the side away from the inner beam plate. The connecting plate is provided with rivet holes. The outer beam plate is inclined toward the end of the connecting plate, and an inclined plate is formed toward the inner beam plate. The inclined plate, the inner beam plate, and the connecting plate together enclose a connecting cavity with an opening on one side, and the riveting hole connects to the connecting cavity.

2. The battery pack rail structure of claim 1, wherein, A bevel is formed between the inclined plate and the connecting plate, and the bevel communicates with the connecting cavity; The width of the bevel between the inclined plate and the connecting plate is L1, where L1 ≥ 10 mm; The depth of the connecting cavity along the extending direction of the connecting plate is L2, where 5mm≤L2≤50mm.

3. The battery pack rail structure of claim 1, wherein, A connecting opening is provided on the inner beam plate, the connecting opening is located at the end of the inner beam plate, and the connecting opening is located in the connecting cavity.

4. The battery pack rail structure of claim 1, wherein, A reinforcing rib is provided between the inner beam plate and the outer beam plate.

5. A battery box characterized by The battery box includes: Top cover; and, At least three side beams, at least one of the side beams being configured as a battery pack side beam structure as described in any one of claims 1-4, the side beams abutting against each other to form a battery pack structural beam, the upper cover plate covering the battery pack structural beam to enclose a receiving cavity, and the riveting hole being formed outside the receiving cavity.

6. The battery pack of claim 5, wherein, A rivet nut and a fixing bolt are provided between the upper cover plate and the battery pack edge beam structure. The rivet nut is fixed in the rivet hole, and the fixing bolt cooperates with the rivet nut to fix the connecting plate and the upper cover plate. The rivet nut is a through-hole rivet nut.

7. The battery pack of claim 5, wherein, The inner beam plate is located on one side of the two battery pack side beam structures that are close to each other, and the opening direction of the inclined bevel is towards the side away from the receiving cavity.

8. The battery pack of claim 5, wherein, The main body of the box girder is welded and fixed to the side beam; Specifically, the inner beam plate on the inner side of the box girder body is welded and fixed at the contact position with the side beam, and the outer beam plate, inner beam plate, and inclined plate on the outer side of the box girder body are all welded and fixed at the contact positions with the side beam.

9. The battery pack of claim 8, wherein, The connecting port is provided on the inner beam plate, and before the side beam is welded and fixed to the battery pack edge beam structure, the connecting port can connect the connecting cavity and the receiving cavity.

10. An electric device, characterized by The electrical equipment includes: The main body of the equipment has an internal power supply chamber; and, The battery box as described in any one of claims 5-9, wherein the battery box is disposed within the power supply cavity.

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