Battery box body, strut beam joint structure thereof and battery pack

Abstract

The utility model relates to a strut beam joint structure of a battery box body, the battery box body comprises a bottom plate and a plurality of boundary beams connected to the peripheral edge of the bottom plate, the plurality of boundary beams and the bottom plate are encircled to form an accommodating cavity for accommodating a battery cell assembly, a strut beam connected between two boundary beams is also arranged in the accommodating cavity, and the strut beam is connected with the battery cell assembly. The support beam joint structure is used for connecting the support beam and the edge beam, the support beam joint structure comprises a fixing part, a first through hole is formed in the fixing part in the axial direction of the fixing part, and a second through hole is formed in the fixing part in the axial direction of the fixing part; the adjusting part penetrates through the first through hole and can move relative to the first through hole, and one end of the adjusting part is detachably connected to the strut beam; and the locking part is used for fixing the adjusting part so as to limit the displacement of the adjusting part. Therefore, the position of the strut beam can be adjusted by the strut beam joint structure, the universality is high, and different requirements of spatial layout of the battery pack are met.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery box and a support beam joint structure thereof and a battery pack. Background Art

[0002] The size and structure of the longitudinal and transverse beams and support beams of the battery box are only applicable to a corresponding battery pack and cannot be adjusted, resulting in a rigid battery pack structure that cannot be applied on a platform and has poor versatility. For vehicles that have been in use for a long time, the related fixing parts of the longitudinal and transverse beams are prone to displacement due to friction, vibration, wear, etc., and cannot effectively achieve the isolation and support functions, which will cause long-term friction and extrusion on the power battery module, and in severe cases will cause safety problems for the battery pack. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery box and its support beam joint structure and a battery pack, so as to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above-mentioned object, the present disclosure provides a support beam joint structure of a battery box, wherein the battery box comprises a bottom plate and a plurality of side beams connected to the peripheral edge of the bottom plate, wherein the plurality of side beams and the bottom plate are combined to form a receiving cavity for receiving a battery cell assembly, wherein a support beam connected between two side beams is further provided in the receiving cavity, wherein the support beam joint structure is used to connect the support beam and the side beam, and wherein the support beam joint structure comprises:

[0005] A fixing portion vertically passes through the side beam and is fixedly connected to the side beam, wherein the fixing portion is provided with a first through hole along the axial direction of the fixing portion;

[0006] an adjusting portion passing through the first through hole and movable relative to the first through hole, one end of the adjusting portion being detachably connected to the supporting beam; and

[0007] The locking portion is used to fix the adjusting portion to limit the displacement of the adjusting portion.

[0008] Optionally, the adjustment portion includes a first adjustment member, which includes an adjustment rod and a fixing member, wherein the adjustment rod is movably installed in the first through hole, and both ends extend out of the first through hole respectively, and the fixing member is arranged at the end of the adjustment rod located in the accommodating cavity, and the fixing member is used to fix the support beam.

[0009] Optionally, the fixing member comprises an anchor hook threadedly connected to the adjusting rod, the anchor hook is an elastic structure, and a mounting hole for the anchor hook to extend into is formed on the side wall of the supporting beam.

[0010] Optionally, the adjustment part also includes a second adjustment member, which is movably installed in the first through hole, with both ends extending out of the first through hole respectively, and the second adjustment member is provided with a second through hole along the axial direction, and the adjustment rod is movably installed in the second through hole, with both ends extending out of the second through hole respectively, and the end of the second adjustment member located in the accommodating cavity is used to stop the support beam to limit the support beam.

[0011] Optionally, the second adjusting member includes a main body section and a limiting section, wherein the main body section is movably installed in the first through hole, and both ends extend out of the first through hole respectively, the main body section is provided with the second through hole along the axial direction of the main body section, the limiting section is arranged at the end of the main body section located in the accommodating cavity, the limiting section is formed with a groove opening toward the support beam and used to limit the support beam, and the groove is connected to the second through hole.

[0012] Optionally, the first adjusting member further includes a first flange connected to the end of the adjusting rod located outside the accommodating cavity, and the second adjusting member further includes a second flange connected to the end of the main body section located outside the accommodating cavity.

[0013] Optionally, the locking portion includes:

[0014] A locking block vertically connected to the side beam;

[0015] a first connecting rod, one end of which is connected to the first flange and the other end of which is detachably connected to the locking block; and

[0016] A second connecting rod has one end connected to the second flange and the other end detachably connected to the locking block.

[0017] Optionally, the locking block is provided with a plurality of limiting holes at intervals along the moving direction of the first connecting rod and the second connecting rod, so as to allow the first connecting rod and the second connecting rod to pass through.

[0018] According to a second aspect of the present disclosure, a battery box is further provided, comprising a bottom plate and four side beams connected to the peripheral edges of the bottom plate, wherein the four side beams and the bottom plate together form a receiving cavity for receiving a battery cell assembly, wherein:

[0019] The side beam comprises two first side beams arranged opposite to each other and two second side beams connected between the two first side beams and arranged opposite to each other, and the supporting beam comprises a cross beam connected between the two first side beams and a longitudinal beam connected between the two second side beams.

[0020] Both ends of the cross beam are connected to the first side beam through the above-mentioned support beam joint structure, and both ends of the longitudinal beam are connected to the second side beam through the above-mentioned support beam joint structure.

[0021] Optionally, the crossbeam includes at least two crossbeam monomers and a crossbeam connector connected between two adjacent crossbeam monomers.

[0022] Optionally, there is a gap between two adjacent crossbeam units for installing the crossbeam connector, the longitudinal beam is vertically spanned on the crossbeam connector, the top end of the crossbeam connector and the ends of the two crossbeam units define a recess for avoiding the longitudinal beam, and a notch is formed at the intersection of the longitudinal beam and the crossbeam, which opens toward the bottom plate and is used to avoid the crossbeam connector.

[0023] Optionally, the longitudinal beam includes at least two longitudinal beam monomers and a longitudinal beam connecting member connected between two adjacent longitudinal beam monomers.

[0024] Optionally, at least one limiting member is disposed on the bottom plate, and the limiting member includes two limiting plates arranged at intervals and used to stop two opposite side walls of the crossbeam, and a cavity for accommodating the crossbeam is formed between the two limiting plates.

[0025] According to a third aspect of the present disclosure, there is also provided a battery pack, comprising the above-mentioned battery case and a battery cell assembly arranged in the accommodating cavity.

[0026] Through the above technical solution, a support beam joint structure is adopted. When the battery pack is deformed due to external force, which affects the spatial safety of the power battery module, the position of the support beam in the battery box can be adjusted through the adjustment part to release the deformation stress of the support beam and ensure the safety of the power battery module. The support beam joint structure can flexibly adjust the position of the support beam, making the components platform-based, highly versatile, and the product safe and reliable, which can meet the different needs of the battery pack space layout.

[0027] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0029] Figure 1 is a cross-sectional view of a support beam joint structure according to an exemplary embodiment;

[0030] Figure 2is a top view of a battery box according to an exemplary embodiment;

[0031] Figure 3 is a front cross-sectional view of a crossbeam in a battery box according to an exemplary embodiment;

[0032] Figure 4 is a schematic diagram of a crossbeam unit in a battery box according to an exemplary embodiment;

[0033] Figure 5 is an assembly cross-sectional view of a crossbeam and a limiting member in a battery box according to an exemplary embodiment;

[0034] Figure 6 is a front cross-sectional view of a longitudinal beam in a battery box according to an exemplary embodiment;

[0035] Figure 7 is a schematic diagram of a longitudinal beam monomer in a battery box according to an exemplary embodiment;

[0036] Figure 8 is an assembly cross-sectional view of a cross beam and a longitudinal beam in a battery box according to an exemplary embodiment;

[0037] Fig. 9 It is a schematic assembly diagram of a cross beam and a longitudinal beam in a battery box without connecting parts according to an exemplary embodiment.

[0038] Description of Reference Numerals

[0039] 1 beam joint structure 11 fixed part

[0040] 12 first adjusting member 121 adjusting rod

[0041] 122 fixing piece 123 first flange

[0042] 13 Second adjustment member 131 Main body section

[0043] 132 limiting section 1321 groove

[0044] 133 Second flange 2 Bottom plate

[0045] 3 side beam 31 first side beam

[0046] 32 Second side beam 4 Support beam

[0047] 40 mounting hole 41 crossbeam

[0048] 411 beam monomer 412 beam connector

[0049] 413 dent 42 longitudinal beam

[0050] 421 longitudinal beam monomer 422 longitudinal beam connecting piece

[0051] 423 notch 5 locking part

[0052] 51 locking block 52 first connecting rod

[0053] 53 second connecting rod 6 limiter DETAILED DESCRIPTION

[0054] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0055] In the present disclosure, unless otherwise stated, the directional words "upper", "lower", "top", and "bottom" used are defined based on the directions in which the relevant components are actually used. "Inside" and "outside" refer to the contours of the corresponding components themselves. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In the present disclosure, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0056] Reference Figures 1 to 9 The present disclosure provides a support beam joint structure 1 of a battery box. The battery box may include a bottom plate 2 and a plurality of side beams 3 connected to the outer peripheral edge of the bottom plate 2. The plurality of side beams 3 and the bottom plate 2 enclose a receiving cavity for receiving a battery cell assembly. A support beam 4 connected between two side beams 3 is also provided in the receiving cavity. The support beam joint structure 1 is used to connect the support beam 4 and the side beam 3. The support beam joint structure 1 may include a fixing portion 11, an adjusting portion and a locking portion 5, wherein the fixing portion 11 vertically passes through the side beam 3 and is fixedly connected to the side beam 3. In an embodiment of the present disclosure, the fixing portion 11 is a rivet nut, which is locked to the side beam 3 by riveting. The fixing portion 11 is provided with a first through hole along the axial direction of the fixing portion 11, and the axial direction of the fixing portion 11 is the extension direction of the support beam 4 connected to the support beam joint structure 1; the adjusting portion passes through the first through hole and can move relative to the first through hole, and one end of the adjusting portion is detachably connected to the support beam 4; the locking portion 5 is used to fix the adjusting portion to limit the displacement of the adjusting portion.

[0057] Through the above technical solution, a support beam joint structure is adopted. When the battery pack is deformed due to external force, which affects the spatial safety of the power battery module, the position of the support beam in the battery box can be adjusted through the adjustment part to release the deformation stress of the support beam and ensure the safety of the power battery module. The support beam joint structure can flexibly adjust the position of the support beam, making the components platform-based, highly versatile, and the product safe and reliable, which can meet the different needs of the battery pack space layout.

[0058] As an exemplary embodiment of the present disclosure, refer to Figure 1 The adjusting part may include a first adjusting member 12, and the first adjusting member 12 may include an adjusting rod 121 and a fixing member 122, wherein the adjusting rod 121 is movably installed in the first through hole, and both ends extend out of the first through hole respectively, and the fixing member 122 is arranged at the end of the adjusting rod 121 located in the accommodating cavity, and the fixing member 122 is used to fix the supporting beam 4. Specifically, the fixing member 122 may be assembled on the adjusting rod 121 by means of clamping or bolt fastening. By moving the adjusting rod 121, the fixing member 122 drives the supporting beam 4 to move, so as to adjust the position of the supporting beam 4 in the battery box.

[0059] Specifically, refer to Figure 1 The fixing member 122 may include an anchor hook threadedly connected to the adjustment rod 121. The anchor hook is an elastic structure. A mounting hole 40 for the anchor hook to be inserted is formed on the side wall of the support beam 4. The support beam 4 can be fixed to the adjustment part by locking the anchor hook into the mounting hole 40. The anchor hook is an elastic structure. When disassembly is required, the anchor hook is withdrawn from the mounting hole 40 and rotated so that the end of the anchor hook avoids the mounting hole 40, and the second adjustment member 13 can be disassembled.

[0060] Further, refer to Figure 1 The adjustment part may also include a second adjustment member 13, which is movably mounted in the first through hole, with both ends extending out of the first through hole respectively. The second adjustment member 13 is provided with a second through hole along the axial direction, and the adjustment rod 121 is movably mounted in the second through hole, with both ends extending out of the second through hole respectively. The end of the second adjustment member 13 located in the accommodating cavity is used to stop the support beam 4 to limit the position of the support beam 4. The second adjustment member 13 can limit the offset value of the support beam 4 in the extension direction of the support beam 4. When assembling the support beam 4, the end of the support beam 4 can be pressed against the end of the second adjustment member 13 first, and then the fixing member 122 can be connected to the support beam 4.

[0061] Further, refer to Figure 1The second adjusting member 13 may include a main body section 131 and a limiting section 132, wherein the main body section 131 is movably installed in the first through hole, and the two ends extend out of the first through hole respectively, the main body section 131 is provided with a second through hole along the axial direction of the main body section 131, the limiting section 132 is arranged at the end of the main body section 131 located in the accommodating cavity, and the limiting section 132 is formed with a groove 1321 which opens toward the support beam 4 and is used to limit the support beam 4, and the groove 1321 is connected to the second through hole. When assembling the support beam 4, the end of the support beam 4 can be inserted into the groove 1321, and the two opposite side walls of the support beam 4 can be respectively stopped at the two side walls of the groove 1321, and the end of the support beam 4 can be stopped at the bottom wall of the groove 1321, and the groove 1321 can limit the offset value of the support beam 4 in the extension direction of the support beam 4 and the extension direction of the side beam 3 connected to the support beam joint structure 1. Furthermore, the groove 1321 is communicated with the second through hole, so that the first adjusting member 12 can pass through the second through hole and extend into the groove 1321 to be connected with the supporting beam 4 .

[0062] In some embodiments, reference Figure 1 , the first adjusting member 12 may also include a first flange 123 connected to the end of the adjusting rod 121 outside the accommodating cavity. Specifically, the first flange 123 may be assembled on the adjusting rod 121 by means of clamping or bolting. The second adjusting member 13 may also include a second flange 133 connected to the end of the main section 131 outside the accommodating cavity. Specifically, the second flange 133 may be assembled on the main section 131 by means of clamping or bolting. The adjusting rod 121 and the main section 131 may be driven to move by moving the first flange 123 and the second flange 133, which is convenient for operation; and the first flange 123 and the second flange 133 can play a limiting role, which can be clamped on the fixing part 11 and the side beam 3 to prevent the first adjusting member 12 and the second adjusting member 13 from coming out of the first through hole of the fixing part 11. Further, the adjusting part is a detachable structure, and the first adjusting member 12 and the second adjusting member 13 can be detached from the fixing part 11 respectively, which is convenient for adjusting, repairing and replacing the support beam 4 and its related accessories in the battery box.

[0063] Among them, reference Figure 1The locking portion 5 may include a locking block 51, a first connecting rod 52 and a second connecting rod 53, wherein the locking block 51 is vertically connected to the side beam 3, specifically, the locking block 51 may be fixed to the side beam 3 by bolts; one end of the first connecting rod 52 is connected to the first flange 123, and the other end is detachably connected to the locking block 51; one end of the second connecting rod 53 is connected to the second flange 133, and the other end is detachably connected to the locking block 51. The first adjusting member 12 is moved relative to the fixing portion 11 in the first through hole by moving the first connecting rod 52, and the second adjusting member 13 is moved relative to the fixing portion 11 in the second through hole by moving the second connecting rod 53. By adjusting the positions of the first adjusting member 12 and the second adjusting member 13, the position of the support beam 4 in the battery box can be adjusted, and support beams 4 of different sizes can be adapted. The first adjusting member 12 and the second adjusting member 13 can be driven to move by the first connecting rod 52 and the second connecting rod 53. The driving method of the first adjusting member 12 and the second adjusting member 13 is not limited to the above method. The movement of the first adjusting member 12 and the second adjusting member 13 can also be driven by gear transmission, which belongs to the protection scope of the present disclosure.

[0064] Furthermore, the locking block 51 is provided with a plurality of limit holes at intervals along the moving direction of the first connecting rod 52 and the second connecting rod 53 for the first connecting rod 52 and the second connecting rod 53 to pass through. The first connecting rod 52 and the second connecting rod 53 are snapped onto the locking block 51 to lock the first adjusting member 12 and the second adjusting member 13, thereby preventing the first adjusting member 12 and the second adjusting member 13 from continuing to move after the position of the support beam 4 is adjusted, thereby affecting product performance and causing safety problems.

[0065] In the embodiments of the present disclosure, specifically, the assembly method of the support beam joint structure 1 is as follows: the fixing portion 11 is locked to the side beam 3 by riveting. The main body section 131 passes through the side beam 3 from the first through hole in the accommodating cavity and extends out of the accommodating cavity, and is assembled with the second flange 133 by means of snap connection or bolt fastening, thereby completing the assembly of the second adjustment member 13. The second adjustment member 13 can move relative to the fixing portion 11 along the first through hole of the fixing portion 11. Further, the adjustment rod 121 is assembled with the anchor hook by means of snap connection or bolt fastening, passes through the side beam 3 from the second through hole of the second adjustment member 13, and is assembled with the first flange 123 by means of snap connection or bolt fastening, thereby completing the assembly of the first adjustment member 12. The first adjustment member 12 can move relative to the second adjustment member 13 or the fixing portion 11 along the second through hole of the second adjustment member 13. Furthermore, the locking block 51 is bolted to the side beam 3, and the first connecting rod 52 and the second connecting rod 53 are respectively connected to the lower bottom surfaces of the first flange 123 and the second flange 133. Furthermore, the support beam 4 is engaged with the anchor hook through the mounting hole 40. The position of the support beam 4 in the battery box is controlled by adjusting the position of the first connecting rod 52 and the second connecting rod 53.

[0066] According to a second aspect of the present disclosure, referring to Figure 2 , a battery box is also provided, which may include a bottom plate 2 and four side beams 3 connected to the outer peripheral edge of the bottom plate 2, the four side beams 3 and the bottom plate 2 enclose a receiving cavity for receiving a battery cell assembly, wherein the side beam 3 includes two first side beams 31 arranged oppositely and two second side beams 32 connected between the two first side beams 31 and arranged oppositely, the support beam 4 includes a cross beam 41 connected between the two first side beams 31 and a longitudinal beam 42 connected between the two second side beams 32, the two ends of the cross beam 41 are respectively connected to the first side beam 31 through the above-mentioned support beam joint structure 1, and the two ends of the longitudinal beam 42 are respectively connected to the second side beam 32 through the above-mentioned support beam joint structure 1. The battery box has all the beneficial effects of the above-mentioned support beam joint structure 1, which will not be repeated here.

[0067] In some embodiments, reference Figure 3 , the crossbeam 41 may include at least two crossbeam monomers 411 and a crossbeam connector 412 connected between two adjacent crossbeam monomers 411. The crossbeam 41 adopts a splicing assembly structure in the battery box, and uses the crossbeam connector 412 to splice multiple crossbeam monomers 411 to ensure the rigidity and deflection of the crossbeam 41 during the operation of the car. The crossbeam connector 412 has strong versatility, and can adapt to different battery box products by simply adjusting the different sizes of the crossbeam 41, which well meets the different requirements of the power battery module for the spatial layout. In the embodiment of the present disclosure, the crossbeam connector 412 includes two spaced bases and a connecting block fixedly connected above the two bases, and the base and the connecting block are connected by bolts. Of course, the crossbeam connector 412 can also be an integrally formed connecting block structure, which is not limited by the present disclosure. Specifically, the crossbeam connector 412 can be fastened to the crossbeam monomer 411 by bolts.

[0068] Further, refer to Figure 3 , Figure 7-Figure 9 There is a gap between two adjacent crossbeam monomers 411 for installing the crossbeam connector 412. The longitudinal beam 42 is vertically connected to the crossbeam connector 412. The top of the crossbeam connector 412 and the ends of the two crossbeam monomers 411 define a recess 413 for avoiding the longitudinal beam 42. A notch 423 is formed at the intersection of the longitudinal beam 42 and the crossbeam 41, which opens toward the bottom plate 2 and is used to avoid the crossbeam connector 412. The longitudinal beam 42 avoids the crossbeam connector 412 through the notch 423, so that the longitudinal beam 42 is vertically staggered with the crossbeam 41. Two adjacent crossbeam monomers 411 can respectively abut against the two side walls of the longitudinal beam 42 to control the offset value of the longitudinal beam 42 sliding to its sides, thereby preventing the battery pack from causing safety problems due to excessive sliding. In the embodiments of the present disclosure, Figure 3As shown, a groove for accommodating the base and part of the connecting block is formed on the cross beam monomer 411, so that only the middle part of the connecting block is bridged by the longitudinal beam 42, so that the longitudinal beam 42 can be clamped between two adjacent cross beam monomers 411 to limit the displacement of the longitudinal beam 42 in the extension direction of the cross beam 41.

[0069] In some embodiments, reference Figure 6 The longitudinal beam 42 may include at least two longitudinal beam monomers 421 and a longitudinal beam connector 422 connected between two adjacent longitudinal beam monomers 421. The longitudinal beam connector 422 has all the beneficial effects of the above-mentioned cross beam connector 412, which will not be described in detail here.

[0070] According to some embodiments, reference Figure 5 At least one stopper 6 may be provided on the bottom plate 2. The stopper 6 may include two stopper plates arranged at intervals and used to stop two opposite side walls of the cross beam 41. A chamber for accommodating the cross beam 41 is formed between the two stopper plates. After the cross beam 41 is assembled, the stopper 6 limits the cross beam 41, controls the sliding offset value of the cross beam 41 in the extension direction of the longitudinal beam 42, and prevents the battery pack from causing safety problems due to excessive sliding.

[0071] According to the third aspect of the present disclosure, a battery pack is also provided, which includes the above-mentioned battery box and a battery cell assembly arranged in the accommodating cavity. The battery pack has all the beneficial effects of the above-mentioned battery box, which will not be repeated here.

[0072] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0073] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0074] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A support beam joint structure of a battery box, the battery box comprising a bottom plate and a plurality of side beams connected to the outer peripheral edge of the bottom plate, the plurality of side beams and the bottom plate together form a receiving cavity for receiving a battery cell assembly, a support beam connected between two side beams is further provided in the receiving cavity, characterized in that: The support beam joint structure is used to connect the support beam and the side beam, and the support beam joint structure includes: A fixing portion vertically passes through the side beam and is fixedly connected to the side beam, wherein the fixing portion is provided with a first through hole along the axial direction of the fixing portion; an adjusting portion passing through the first through hole and movable relative to the first through hole, one end of the adjusting portion being detachably connected to the supporting beam; and The locking portion is used to fix the adjusting portion to limit the displacement of the adjusting portion.

2. The beam joint structure according to claim 1, characterized in that: The adjusting portion includes a first adjusting member, which includes an adjusting rod and a fixing member, wherein the adjusting rod is movably installed in the first through hole, and both ends extend out of the first through hole respectively, and the fixing member is arranged at the end of the adjusting rod located in the accommodating cavity, and the fixing member is used to fix the support beam.

3. The support beam joint structure according to claim 2, characterized in that: The fixing member comprises an anchor hook which is threadedly connected to the adjusting rod, the anchor hook is an elastic structure, and a mounting hole for the anchor hook to extend into is formed on the side wall of the supporting beam.

4. The support beam joint structure according to claim 2, characterized in that: The adjustment part also includes a second adjustment member, which is movably installed in the first through hole, with two ends extending out of the first through hole respectively. The second adjustment member is axially provided with a second through hole, and the adjustment rod is movably installed in the second through hole, with two ends extending out of the second through hole respectively. The end of the second adjustment member located in the accommodating cavity is used to stop the support beam to limit the support beam.

5. The support beam joint structure according to claim 4, characterized in that: The second adjusting member includes a main body section and a limiting section, wherein the main body section is movably installed in the first through hole, and both ends extend out of the first through hole respectively, the main body section is provided with the second through hole along the axial direction of the main body section, the limiting section is arranged at the end of the main body section located in the accommodating cavity, the limiting section is formed with a groove opening toward the support beam and used for limiting the support beam, and the groove is communicated with the second through hole.

6. The beam joint structure according to claim 5, characterized in that: The first adjusting member further includes a first flange connected to the end of the adjusting rod located outside the accommodating cavity, and the second adjusting member further includes a second flange connected to the end of the main body section located outside the accommodating cavity.

7. The support beam joint structure according to claim 6, characterized in that: The locking portion comprises: A locking block vertically connected to the side beam; a first connecting rod, one end of which is connected to the first flange and the other end of which is detachably connected to the locking block; and A second connecting rod has one end connected to the second flange and the other end detachably connected to the locking block.

8. The support beam joint structure according to claim 7, characterized in that: The locking block is provided with a plurality of limiting holes at intervals along the moving direction of the first connecting rod and the second connecting rod, so as to allow the first connecting rod and the second connecting rod to pass through.

9. A battery box, characterized in that: It comprises a bottom plate and four side beams connected to the outer peripheral edge of the bottom plate, wherein the four side beams and the bottom plate together form a receiving cavity for receiving the battery cell assembly, wherein: The side beam comprises two first side beams arranged opposite to each other and two second side beams connected between the two first side beams and arranged opposite to each other, and the supporting beam comprises a cross beam connected between the two first side beams and a longitudinal beam connected between the two second side beams. The two ends of the cross beam are respectively connected to the first side beam through the support beam joint structure described in any one of claims 1-8, and the two ends of the longitudinal beam are respectively connected to the second side beam through the support beam joint structure described in any one of claims 1-8.

10. The battery case according to claim 9, characterized in that: The cross beam comprises at least two cross beam monomers and a cross beam connector connected between two adjacent cross beam monomers.

11. The battery case according to claim 10, characterized in that: There is a gap between two adjacent crossbeam units for installing the crossbeam connector, the longitudinal beam is vertically spanned on the crossbeam connector, the top end of the crossbeam connector and the ends of the two crossbeam units define a recess for avoiding the longitudinal beam, and a notch is formed at the intersection of the longitudinal beam and the crossbeam, which opens toward the bottom plate and is used to avoid the crossbeam connector.

12. The battery case according to claim 9, characterized in that: The longitudinal beam includes at least two longitudinal beam monomers and a longitudinal beam connecting member connected between two adjacent longitudinal beam monomers.

13. The battery case according to claim 9, characterized in that: At least one limiting member is disposed on the bottom plate, and the limiting member includes two limiting plates arranged at intervals and used to stop two opposite side walls of the cross beam, and a cavity for accommodating the cross beam is formed between the two limiting plates.

14. A battery pack, characterized in that: It comprises a battery case as described in any one of claims 9 to 13, and a battery cell assembly arranged in the accommodating cavity.

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