Battery pack case, battery pack, and electric device

Abstract

The present application relates to a battery pack case, a battery pack, and an electric device. The battery pack case comprises: a mounting beam, wherein an accommodation portion is arranged on the mounting beam; and a sleeve assembly, wherein the sleeve assembly comprises a sleeve body and a bearing member fixed to the sleeve body, the bearing member is arranged in the accommodation portion, the bearing member is welded to the mounting beam, and the bearing member is connected to the mounting beam by means of a fastener. According to the present application, a sleeve assembly is configured to comprise a bearing member, the bearing member is welded to a mounting beam, and the sleeve assembly is further tightly connected to the mounting beam by means of a fastener, so that the weld is prevented from being stressed and cracked, and thus the connection between the sleeve assembly and the mounting beam is not easily damaged when the battery pack operates in the vibration and shock working conditions, improving the strength and reliability of the connection between the sleeve assembly and the mounting beam.

Description

Battery pack box, battery pack and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application CN202311579107.1 filed on November 21, 2023, with the invention name “Battery pack case, battery pack and electrical equipment”. The entire contents of the above Chinese patent application are incorporated into this application by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery pack case, a battery pack and an electrical device. Background Art

[0004] New energy vehicles draw their energy from battery packs. The battery packs are secured to the vehicle body via mounting points. For battery-swappable vehicles, in particular, the battery packs include mounting sleeves that are secured to the battery pack structure, such as the mounting beams. Currently, however, the mounting sleeves are typically secured directly to the battery pack structure using a single mounting method. This connection is subject to significant stress and damage under vibration and shock conditions, making it difficult to meet the required strength and reliability requirements.

[0005] Summary of the Invention

[0006] The present application provides a battery pack case, a battery pack, and an electrical device to solve or at least improve the problems in the above-mentioned background technology.

[0007] On one hand, the present application provides a battery pack case, comprising: a mounting beam, on which a accommodating portion is provided; a sleeve assembly, which includes a sleeve body and a supporting member fixed to the sleeve body; the supporting member is arranged in the accommodating portion; wherein the supporting member is welded to the mounting beam, and the supporting member is connected to the mounting beam via a fastener.

[0008] Therefore, by configuring the sleeve assembly to include a carrier, the carrier is welded to the mounting beam and fasteners are used to further secure the sleeve assembly and the mounting beam. The fasteners further strengthen the weld seam, preventing stress cracking and making the connection less susceptible to damage under vibration and impact conditions, thereby improving the strength and reliability of the connection.

[0009] Furthermore, the mounting beam includes an upper wall and a lower wall that are arranged opposite to each other, and the accommodating portion passes through the upper wall and the lower wall.

[0010] Furthermore, the accommodating portion includes a step hole, the step hole includes a first opening and a second opening located below the first opening, the size of the first opening is smaller than the size of the second opening, so as to form a step surface at the interface between the first opening and the second opening; the bearing member includes a main bearing portion, the upper surface of the main bearing portion is a first bearing surface; wherein, the first bearing surface abuts against the step surface.

[0011] Furthermore, an adhesive is provided between the first bearing surface and the step surface.

[0012] Furthermore, the bearing member further includes a first flange portion extending outward from the main bearing portion; wherein the first flange portion is welded to the lower wall.

[0013] Furthermore, the upper surface of the first flange portion is a second bearing surface; the distance between the first bearing surface and the second bearing surface is slightly greater than the distance between the step surface and the lower wall surface.

[0014] Furthermore, the difference between the thickness of the first flange portion and the thickness of the lower wall is 0 mm to 1.5 mm; or, the first flange portion includes an edge thinning area, and the difference between the thickness of the edge thinning area and the thickness of the lower wall is 0 mm to 1.5 mm.

[0015] Furthermore, the bearing member further includes a second flange portion extending outward from the upper end portion of the sleeve body, and the second flange portion is welded to the upper wall.

[0016] Furthermore, the second flange portion protrudes from the upper wall, and a difference between a distance that the second flange portion protrudes from the upper wall and a thickness of the upper wall is 0 mm to 1.5 mm.

[0017] Furthermore, it also includes a side beam arranged on the inner side of the mounting beam, the height of the side beam is greater than the height of the mounting beam; the first flange portion abuts against the side beam; and / or the second flange portion abuts against the side beam.

[0018] Furthermore, it also includes a first hole passing through the upper wall, a second hole passing through the step surface, and a third hole opened on the main bearing portion; the fastener is sequentially inserted into the first hole, the second hole and the third hole.

[0019] Furthermore, the mounting beam includes a profile cavity located between the upper wall and the step surface, the profile cavity is divided into multiple cavities by multiple reinforcing ribs, a support block is provided in the cavity, and a fourth hole is provided on the support block; the fastener is sequentially passed through the first hole, the fourth hole, the second hole and the third hole; and / or, the fastener is sequentially passed through the third hole, the second hole and the fourth hole.

[0020] Furthermore, an avoidance groove is provided on the main bearing portion.

[0021] Furthermore, the fasteners are bolts or rivets.

[0022] On the other hand, the present application also provides a battery pack, which includes a battery pack case as described in any of the above technical solutions.

[0023] Finally, the present application also provides an electrical device, which includes the battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the overall structure of a battery pack case according to an embodiment of the present application.

[0025] FIG2 is a schematic diagram of the structure of the sleeve assembly and the mounting beam after assembly in the present application.

[0026] FIG3 is an exploded schematic diagram of FIG2 .

[0027] 4a and 4b are schematic diagrams of the partial structures of the mounting beam and the side beam according to an embodiment of the present application.

[0028] 5a and 5b are schematic structural diagrams of the sleeve assembly according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following description sets forth many specific details to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the scope of the present application. Therefore, the present application is not limited to the specific implementations disclosed below.

[0030] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, inside, and outside, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0031] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0032] In the description of this application, reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some implementation methods" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application.

[0033] Referring to Figures 1 to 5 , the present application provides a battery pack case, comprising a mounting beam 100 having a receiving portion 110 disposed thereon. Specifically, the mounting beam 100 is disposed outside a side beam 400 ; illustratively, the mounting beam 100 is fixed to the side beam 400 , or the mounting beam 100 and the side beam 400 are integrally formed.

[0034] The battery pack case also includes a sleeve assembly 200, which is arranged in the accommodating portion 110; the sleeve assembly 200 includes a sleeve body 210 and a carrier 220 fixed to the sleeve body 210. Exemplarily, referring to Figures 5a and 5b, the sleeve body 210 is cylindrical and includes a circumferential wall 211 and a top wall 212. A through hole is provided on the top wall 212, and the battery pack mounting bolt (not shown) is arranged in the cavity surrounded by the circumferential wall 211 and extends from the through hole to connect with the vehicle end nut. For a battery-swappable vehicle, the bottom of the sleeve body 210 is an open end, so that the unlocking tool can rotate the mounting bolt from the open end, thereby separating or engaging the mounting bolt from the nut on the vehicle end, thereby realizing actions such as disassembly and installation of the battery pack. Exemplarily, the carrier 220 is arranged on the periphery of the sleeve body 210 and is cast integrally with the sleeve body 210. In addition, a plurality of sleeve assemblies 200 and corresponding mounting bolts may be provided on the battery pack case to ensure the reliability of the battery pack mounting.

[0035] The carrier 220 is welded to the mounting beam 100 , and the battery pack body further includes a fastener 300 . The carrier 220 and the mounting beam 100 are also fastened together by the fastener 300 , thereby fixing the sleeve assembly 200 to the mounting beam 100 .

[0036] Thus, by configuring the sleeve assembly 200 to include a carrier 220, the carrier 220 is welded to the mounting beam 100, and the sleeve assembly 200 and the mounting beam 100 are further fastened together by the fastener 300. The fastener connection thus further strengthens the weld, preventing stress cracking in the weld, making the connection between the battery pack less susceptible to damage under vibration and impact conditions, and improving the strength and reliability of the connection.

[0037] In this embodiment, the mounting beam 100 and the side beam 400 are integrally extruded and formed into a profile beam, and a plurality of reinforcing ribs 160 are provided in the profile cavity. This will be described in detail below.

[0038] 4 a and 4 b , specifically, the mounting beam 100 includes an upper wall 120 and a lower wall 130 that are oppositely disposed, and the receiving portion 110 penetrates the upper wall 120 and the lower wall 130 , thereby facilitating the fixing of the sleeve assembly 200 in the receiving portion 110 .

[0039] Furthermore, the accommodating portion 110 includes a stepped hole, which includes a first opening 111 and a second opening 112 located below the first opening 111. The size of the first opening 111 is smaller than the size of the second opening 112, so as to form a stepped surface 113 at the interface between the first opening 111 and the second opening 112. Exemplarily, the first opening 111 and the second opening 112 are both rectangular openings, and the area of ​​the first opening 111 is smaller than the area of ​​the second opening 112, so as to form the stepped surface 113. Accordingly, the bearing member 220 includes a main bearing portion 221, the upper surface of which is a first bearing surface 2211; wherein the first bearing surface 2211 is against the stepped surface 113.

[0040] As a result, because the first opening 111 and the second opening 112 form a stepped hole, the first bearing surface 2211 of the sleeve assembly 200 abuts against the stepped surface 113, forming the primary load-bearing structure. Since the battery pack primarily bears vertical gravity when mounted on an electrical device, the first bearing surface 2211 is in surface contact with the stepped surface 113, directly bearing the load. Therefore, the sleeve assembly 200 is not subject to shear forces, significantly improving the stability and reliability of the mounting. Furthermore, the dimensions of the main bearing portion 211 are illustratively adapted to those of the second opening 112.

[0041] Furthermore, in this embodiment, the mounting beam 100 is a profiled beam. The profile cavity includes multiple reinforcing ribs 160, including transverse reinforcing ribs 161 and longitudinal reinforcing ribs 162. The reinforcing ribs 160 divide the profile cavity into multiple cavities. The accommodating portion 110 is machined into the mounting beam 100. When the stepped hole is machined, the transverse reinforcing ribs 161 within the profile cavity form a stepped surface 113. Specifically, the lowest cavity is removed through machining, exposing the transverse reinforcing ribs 161 and forming the stepped surface 113.

[0042] Since the stepped hole of the accommodating portion 110 is formed by machining, in order to avoid damage to the stepped surface 113 when the lower longitudinal reinforcement ribs 162 are removed by machining, a certain height of the longitudinal reinforcement ribs 162 is left unmachined (not shown). Therefore, an avoidance groove 226 is also provided on the main bearing portion 221 of the sleeve assembly to avoid the longitudinal reinforcement ribs remaining from the above-mentioned machining, so that the main bearing surface 2211 can be fully fitted with the stepped surface 113, thereby improving the bearing performance.

[0043] Continuing to refer to Figures 2 to 4, in this embodiment, the accommodating portion 110 also penetrates the width direction of the mounting beam 100, that is, the inner and outer walls of the mounting beam 100 are also formed with openings, so that the sleeve assembly 200 can be assembled into the accommodating portion 110 from the side of the mounting beam 100, thereby facilitating the assembly of the sleeve assembly 200 and saving assembly space in the height direction. Accordingly, the bearing member 220 also includes a sealing plate 222 extending upward from the main bearing portion 221, and the sealing plate 222 and the main bearing portion 221 together close the outer wall opening of the mounting beam 100. At the same time, the sealing plate 222 and the main bearing portion 221 are also welded to the outer wall of the mounting beam at the outer wall opening, thereby increasing the area where the sleeve assembly is welded to the mounting beam, thereby improving the firmness of the weld between the two.

[0044] In some other embodiments, the accommodating portion 110 only penetrates the height direction of the mounting beam 100, but not the width direction of the mounting beam 100, so that the sleeve assembly 200 is assembled into the accommodating portion 110 from the bottom to the top from the lower side of the mounting beam 100, which does not deviate from the essence of the present application.

[0045] Continuing with Figures 5a and 5b , the bearing member 220 further includes a first flange portion 223 extending outward from the main bearing portion 221. The upper surface of the first flange portion 223 serves as a second bearing surface 2231. The first flange portion 223 is welded to the lower wall 130. The first flange portion 223 is positioned below the lower wall 130 of the mounting beam, and the step formed between the two serves as a weld groove.

[0046] To improve welding reliability and performance, in some other embodiments, the thickness of the first flange portion 223 is comparable to the wall thickness of the mounting beam 100, for example, the two are equal or differ by less than 1.5 mm, thereby preventing one component from being burned through while the other component is insufficiently penetrated during welding. In this embodiment, to improve the load-bearing capacity of the first flange portion 223 while meeting the welding process, the first flange portion 223 includes an edge thinning area 2232. The thickness of the edge thinning area 2232 is comparable to the wall thickness of the lower wall 130, for example, the two are equal or differ by less than 1.5 mm. As a result, the overall thickness of the first flange portion 223 is greater than the wall thickness of the mounting beam, thereby improving the strength and load-bearing capacity of the first flange portion 223. At the same time, the edge thinning area 2232 meets the welding process and improves welding performance.

[0047] Furthermore, the distance between the first bearing surface 2211 and the second bearing surface 2231 is slightly greater than the distance between the step surface 113 and the surface of the lower wall 130. This ensures that when the sleeve assembly 200 is installed in the accommodating portion 110, the first bearing surface 2211 and the step surface 113 are completely aligned, thereby ensuring load-bearing performance. This prevents the first bearing surface 2211 from failing to align with the step surface 113 when the second bearing surface 2231 aligns with the surface of the lower wall 130, thereby preventing poor load-bearing performance. For example, the distance between the first bearing surface 2211 and the second bearing surface 2231 is 0.1 mm to 2 mm greater than the distance between the step surface 113 and the surface of the lower wall 130.

[0048] Furthermore, an adhesive is provided between the first bearing surface 2211 and the stepped surface 113 to further bond the two. Alternatively, an adhesive may be provided between the second bearing surface 2231 and the wall surface of the lower wall 130 to further bond the two, thereby further enhancing the secureness of the connection.

[0049] 5 a and 5 b , the bearing member 220 further includes a second flange portion 224 extending outward from the upper end portion of the sleeve body 210 , and the second flange portion 224 is welded to the upper wall 120 .

[0050] Exemplarily, the second flange portion 224 protrudes from the upper wall 120, that is, the upper surface of the second flange portion 224 is higher than the wall surface of the upper wall 120, so that the step formed by the two serves as a groove for welding the two. The distance that the second flange portion 224 protrudes from the upper wall 120 is equivalent to the wall thickness of the upper wall 120, for example, the two are equal or differ by less than 1.5 mm, so as to improve welding performance. In some embodiments, the size of the second flange portion 224 is adapted to the size of the first opening 111 to close the first opening 111. In some other implementations, the size of the second flange portion 224 is larger than the size of the first opening 111, that is, in addition to closing the first opening 111, the second flange portion 224 also has an extension area extending in the longitudinal direction of the mounting beam, so that it is welded to the upper wall through the extension area; in addition, an edge welding area similar to the edge thinning area of ​​the first flange portion 223 can also be provided to improve welding performance.

[0051] As shown in Figures 2 to 4 , the height of the side beam 400 is greater than that of the mounting beam 100, forming upper and lower steps between the mounting beam 100 and the side beam 400. The first flange 223 abuts and is welded to the side beam 400, while the second flange 224 abuts and is welded to the side beam 400. This abutment strengthens the structure, while the welding secures the connection.

[0052] In this embodiment, the second flange portion 224 further includes an upwardly extending extension portion 2241, which abuts and welds against the side beam 400 via the extension portion 2241. The extension portion 2241 increases the area of ​​abutment and welding between the second flange portion 224 and the side beam 400, further enhancing the securement of the connection. Of course, it is understood that in other embodiments, the first flange portion 223 may also include a downwardly extending extension portion, which abuts and welds against the side beam via the extension portion, without departing from the essence of the present application.

[0053] Continuing with Figures 2 to 5 , the battery pack housing further includes a first hole 140 extending through the upper wall 120 of the mounting beam, a second hole 150 extending through the stepped surface 130, and a third hole 225 formed on the main load-bearing portion 221. The fastener 300 is sequentially inserted through the first hole 140, the second hole 150, and the third hole 225. In other embodiments, the second flange portion 224 includes an extended region extending in the longitudinal direction of the mounting beam. In such cases, the fastener 300 may first pass through the extended region and then sequentially insert through the first hole 140, the second hole 150, and the third hole 225. Such embodiments also fall within the scope of protection of this application.

[0054] Exemplarily, the fastener 300 is a bolt, and accordingly, the third hole 225 is a threaded hole, which can be a through hole or a blind hole. Thus, the bolt sequentially passes through the first hole 140 and the second hole 150, and is finally tightened into the threaded hole of the third hole 225. Alternatively, the fastener 300 is a rivet, and the third hole 225 is an unthreaded through hole. The rivet sequentially passes through the first hole 140, the second hole 150, and the third hole 225, thereby achieving a riveted connection between the sleeve assembly and the mounting beam. Furthermore, it is understood that to enhance the secureness of the fixation, a plurality of first holes 140, second holes 150, and third holes 225 may be provided.

[0055] Referring to FIG3 , to further prevent the cavity from being crushed by the fastener and to prevent the fastener from loosening under vibration and impact conditions, a support block 500 is disposed within the cavity between the upper wall 120 and the stepped surface 113. The support block 500 is provided with a fourth hole 510. The fastener 300 is sequentially inserted through the first hole 140, the fourth hole 510, the second hole 150, and the third hole 225. Furthermore, to ensure that the support block 500 does not move after being assembled into the cavity and before the fastener is secured, the support block 500 is secured within the cavity, for example, by bonding, welding, or clamping.

[0056] In some other embodiments, the fastener 300 is sequentially inserted into the third hole 225, the second hole 150, and the fourth hole 510, i.e., the fastener 300 is assembled from the bottom up. For example, the fastener 300 is a bolt, the fourth hole 510 is a threaded hole, and the third hole 225 is an unthreaded through hole, so that the bolt sequentially passes through the third hole 225, the second hole 150, and is finally tightened into the threaded hole of the fourth hole 510.

[0057] In this embodiment, referring again to Figures 3 to 5 , four first holes 140 are provided, and six second holes 150, six third holes 225, and six support blocks 500 are provided. Four fasteners are assembled from top to bottom, while the remaining two fasteners are assembled from bottom to top. This simultaneous assembly method ensures a more balanced longitudinal load-bearing performance of the structure, resulting in a more secure and reliable connection.

[0058] In addition, the present application also provides a battery pack, comprising the battery pack housing described above. The battery pack is mounted on an electrical device. Exemplarily, the battery pack is detachably mounted on a vehicle.

[0059] Finally, the present application also provides an electrical device comprising the aforementioned battery pack. For example, the electrical device is a vehicle. Furthermore, the vehicle is a battery-swappable vehicle.

[0060] It should be noted that although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A battery pack box, characterized in that: include: A mounting beam, wherein a receiving portion is provided on the mounting beam; A sleeve assembly, the sleeve assembly comprising a sleeve body and a bearing member fixed to the sleeve body; the bearing member is disposed in the accommodating portion; Wherein, the bearing member is welded to the mounting beam and the bearing member is connected to the mounting beam via a fastener.

2. The battery pack case according to claim 1, characterized in that: The mounting beam comprises an upper wall and a lower wall which are arranged opposite to each other, and the accommodation portion passes through the upper wall and the lower wall.

3. The battery pack case according to claim 2, characterized in that: The accommodating portion includes a stepped hole, the stepped hole includes a first opening and a second opening located below the first opening, the first opening is smaller than the second opening, so as to form a stepped surface at the interface between the first opening and the second opening; The bearing member comprises a main bearing portion, and the upper surface of the main bearing portion is a first bearing surface; Wherein, the first bearing surface abuts against the step surface.

4. The battery pack case according to claim 3, characterized in that: An adhesive is also provided between the first bearing surface and the step surface.

5. The battery pack case according to claim 3, characterized in that: The bearing member further includes a first flange portion extending outwardly from the main bearing portion; Wherein, the first flange portion is welded to the lower wall.

6. The battery pack case according to claim 5, characterized in that: The upper surface of the first flange portion is a second bearing surface; The distance between the first bearing surface and the second bearing surface is slightly greater than the distance between the step surface and the lower wall surface.

7. The battery pack case according to claim 5, characterized in that: The difference between the thickness of the first flange portion and the thickness of the lower wall is 0 mm to 1.5 mm; Alternatively, the first flange portion includes an edge thinning area, and the difference between the thickness of the edge thinning area and the wall thickness of the lower wall is 0 mm to 1.5 mm.

8. The battery pack case according to claim 5, characterized in that: The bearing member further includes a second flange portion extending outward from the upper end portion of the sleeve body, and the second flange portion is welded to the upper wall.

9. The battery pack case according to claim 8, characterized in that: The second flange portion protrudes from the upper wall, and a difference between a distance that the second flange portion protrudes from the upper wall and a thickness of the upper wall is 0 mm to 1.5 mm.

10. The battery pack case according to claim 8, characterized in that: It also includes a side beam disposed inside the mounting beam, wherein the height of the side beam is greater than the height of the mounting beam; The first flange portion abuts against the side beam; and / or the second flange portion abuts against the side beam.

11. The battery pack case according to any one of claims 3 to 10, characterized in that: It also includes a first hole penetrating the upper wall, a second hole penetrating the step surface, and a third hole opened on the main bearing portion; The fastener is sequentially inserted into the first hole, the second hole and the third hole.

12. The battery pack case according to claim 11, characterized in that: The mounting beam comprises a profile cavity located between the upper wall and the step surface, the profile cavity is divided into a plurality of cavities by a plurality of reinforcing ribs, a support block is arranged in the cavity, and a fourth hole is arranged on the support block; The fastener is sequentially inserted into the first hole, the fourth hole, the second hole, and the third hole; and / or the fastener is sequentially inserted into the third hole, the second hole, and the fourth hole.

13. The battery pack case according to claim 12, characterized in that: The main bearing portion is also provided with an avoidance groove.

14. The battery pack case according to claim 1 or 12, characterized in that: The fasteners are bolts or rivets.

15. A battery pack, characterized in that: The battery pack comprises a battery pack case according to any one of claims 1-14.

16. An electrical equipment, characterized in that: The electrical device comprises the battery pack as claimed in claim 15.

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