Cross beam assembly, lower case, case and battery pack

Abstract

The present disclosure relates to the technical field of batteries, and particularly relates to a beam assembly, a lower box body, a box body and a battery pack. The lower box body comprises a fixed beam, a movable beam and a first fastener, the fixed beam is provided with a slope, the movable beam is provided with a second slope capable of sliding along the first slope, the movable beam is provided with a first strip-shaped hole extending along the moving direction of the movable beam relative to the fixed beam, and the first fastener is detachably connected to the fixed beam through the first strip-shaped hole to realize the relative fixation of the fixed beam and the movable beam. By adjusting the distance between the movable beam and the fixed beam, the fixed beam and the movable beam are both matched with the box frame of the lower box body to realize the pressing of the battery cell group. Compared with the prior art, the assembly tolerance can be absorbed, the battery cell is in hard contact with the box frame and the beam assembly, the situation that the outermost battery cell of the battery cell group is skewed and tears the bus bar is avoided, the reliability of the structure is ensured, and the consistency of the expansion deformation of each battery cell is improved.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a crossbeam assembly, a lower housing, and a battery pack. Background Technology

[0002] CTP (cell to pack) technology is a module-free battery pack structure technology.

[0003] Currently, battery cells are placed into the corresponding area of ​​the housing using a "squeeze-in" method. "Squeeze-in" involves designing rigid U-shaped frames between the cells in the battery cell assembly to create space and offset cell expansion. Elastic foam is designed around the two outermost cells of the assembly. The battery cell assembly is placed inside the housing by squeezing the elastic foam, and the rebound of the foam helps the two outermost cells fit snugly against the housing. However, the rebound deformation of the elastic foam is generally large, far exceeding the expansion deformation of the cells. The elastic foam cannot effectively support the outermost cells, which are prone to tilting and tearing the tabs and busbars, affecting structural stability. Furthermore, the expansion deformation of the outermost cells is greater than that of the inner cells, affecting cell consistency.

[0004] Therefore, there is an urgent need for a crossbeam assembly, a lower housing, a housing, and a battery pack to solve the above problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this disclosure provides a crossbeam assembly, a lower housing, a housing, and a battery pack.

[0006] In a first aspect, this disclosure provides a beam assembly suitable for the lower housing of a battery pack, including a fixed beam, a movable beam, and a first fastener. The fixed beam is provided with a first inclined surface, and the movable beam is provided with a second inclined surface that can slide along the first inclined surface. The movable beam is provided with a first strip-shaped hole extending in the direction of movement of the movable beam relative to the fixed beam. The first fastener passes through the first strip-shaped hole and is detachably connected to the fixed beam.

[0007] The fixed beam has a first contact surface on the side opposite to the movable beam that can be in contact with the battery cell; the movable beam has a second contact surface on the side opposite to the fixed beam that can be in contact with the battery cell.

[0008] The fixed beam is provided with a plurality of reinforcing ribs, each reinforcing rib having the first inclined surface. The movable beam has a plurality of first protrusions, each first protrusion having the second inclined surface. The reinforcing ribs form insertion holes for the first protrusions to extend into.

[0009] Secondly, this disclosure provides a lower housing, including the aforementioned crossbeam assembly, the lower housing also including a housing frame, and the fixing beam is installed inside the housing frame.

[0010] The lower housing also includes a side transition block, and at least two of the side transition blocks are provided on the inner side of the housing frame.

[0011] The side transition block is provided with a third inclined surface that is parallel to or coplanar with the first inclined surface, and the movable beam is provided with a fourth inclined surface that can slide along the third inclined surface.

[0012] The lower housing also includes a second fastener. The movable beam has a second strip hole extending in the direction of movement of the movable beam relative to the fixed beam. The second fastener passes through the second strip hole and is detachably connected to the side adapter block.

[0013] The lower housing also includes a liquid cooling plate and a first fastening assembly. The housing frame and the liquid cooling plate surround a cavity that can accommodate the battery cell assembly.

[0014] Both the fixed beam and the liquid cooling plate are provided with first through holes, and at least one of the first through holes is a strip-shaped hole extending along the moving direction of the movable beam relative to the fixed beam. The first fastening component passes through the two first through holes to achieve relative fixation of the fixed beam and the liquid cooling plate.

[0015] The lower housing also includes a crossbeam transition block and a second fastening assembly. At least two crossbeam transition blocks are provided on the inner side of the housing frame, and the fixed beam is connected between the two crossbeam transition blocks.

[0016] Both the crossbeam transition block and the corresponding fixed beam have a second through hole at one end, and at least one of the second through holes is a strip-shaped hole extending along the moving direction of the movable beam relative to the fixed beam. The second fastening component passes through the two second through holes to achieve relative fixation of the fixed beam and the crossbeam transition block.

[0017] Thirdly, this disclosure provides a housing, including the aforementioned lower housing.

[0018] Fourthly, this disclosure provides a battery pack including the aforementioned housing.

[0019] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0020] This crossbeam assembly features a fixed beam and a movable beam. The fixed and movable beams can slide relative to each other via a first and a second inclined plane and are fixed by a first fastener. This allows for adjustment of the distance between the movable and fixed beams, ensuring that both the fixed and movable beams engage with the lower housing frame to securely hold the battery cell assembly together. Compared to existing technologies, this design absorbs assembly tolerances, ensuring rigid contact between the battery cell and the housing frame and crossbeam assembly. This prevents the outermost battery cell from becoming misaligned and tearing the electrode busbar, thus guaranteeing structural reliability and improving the consistency of expansion and deformation of each battery cell. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the beam assembly described in Embodiment 1 of this disclosure. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the beam assembly described in Embodiment 1 of this disclosure. Figure 2 ;

[0025] Figure 3 This is a structural schematic diagram of a fixed beam provided in Embodiment 1 of this disclosure from a first-view perspective;

[0026] Figure 4 This is a structural schematic diagram of the fixed beam provided in Embodiment 1 of this disclosure from a second perspective;

[0027] Figure 5 This is a schematic diagram of the structure of the movable beam provided in Embodiment 1 of this disclosure;

[0028] Figure 6 This is a schematic diagram of the lower housing structure as described in Embodiment 1 of this disclosure;

[0029] Figure 7 This is a schematic diagram of the connection structure between the fixed beam and the liquid cooling plate as described in Embodiment 1 of this disclosure;

[0030] Figure 8 This is a structural schematic diagram of the beam transition block provided in Embodiment 1 of this disclosure;

[0031] Figure 9This is a schematic diagram of the connection structure between the crossbeam transition block and the fixed beam provided in Embodiment 1 of this disclosure;

[0032] Figure 10 This is a schematic diagram of the lower housing provided in Embodiment 2 of this disclosure;

[0033] Figure 11 This document discloses a schematic diagram of the connection structure between the side transition block and the movable beam according to Embodiment 2.

[0034] Among them, 1. Crossbeam assembly; 11. Fixed beam; 111. First plate; 1111. First mating surface; 112. Reinforcing rib; 1121. First inclined surface; 113. Mounting cylinder; 114. Connecting part; 12. Movable beam; 121. Second plate; 1211. Second mating surface; 122. First protrusion; 1221. Second inclined surface; 123. Second protrusion; 1231. First strip hole; 13. First fastener; 14. First press-fit nut;

[0035] 2. Box frame;

[0036] 3. Liquid cooling plate;

[0037] 4. Crossbeam transition block; 41. Base plate; 42. Mounting plate; 43. Reinforcing rib plate;

[0038] 5. First fastening assembly; 51. Protruding stud; 52. Nut;

[0039] 6. Second fastening assembly; 61. Bolt; 62. Second press-fit nut;

[0040] 7. Side transition block; 71. Third inclined surface;

[0041] 8. Second fastener;

[0042] 10. Cavity;

[0043] 20. Battery cells;

[0044] 101. First through hole; 102. Second through hole. Detailed Implementation

[0045] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0046] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0047] Example 1

[0048] like Figures 1 to 9 As shown, this embodiment of the present disclosure provides a crossbeam assembly 1, suitable for the lower housing of a battery pack. The crossbeam assembly 1 includes a fixed beam 11, a movable beam 12, and a first fastener 13. The fixed beam 11 is provided with a first inclined surface 1121, and the movable beam 12 is provided with a second inclined surface 1221 that can slide along the first inclined surface 1121. The movable beam 12 has a first slotted hole 1231 extending in the direction of movement of the movable beam 12 relative to the fixed beam 11. The first fastener 13 passes through the first slotted hole 1231 and is detachably connected to the fixed beam 11 to achieve relative fixation of the fixed beam 11 and the movable beam 12.

[0049] It is understandable that the crossbeam assembly 1, by setting a fixed beam 11 and a movable beam 12, can achieve relative sliding through the first inclined surface 1121 and the second inclined surface 1221, and is fixed by the first fastener 13. This allows for adjustment of the distance between the movable beam 12 and the fixed beam 11, so that both the fixed beam 11 and the movable beam 12 can cooperate with the box frame 2 of the lower box to achieve tight contact with the battery cell assembly. Compared with the prior art, this can absorb assembly tolerances, allowing the battery cell 20 to make hard contact with the box frame 2 and the crossbeam assembly 1, avoiding the situation where the outermost battery cell 20 of the battery cell assembly is skewed and tears the electrode busbar, ensuring the reliability of the structure, and improving the consistency of the expansion deformation of each battery cell 20.

[0050] It should be noted that the battery cell pack includes multiple battery cells 20, which are arranged side by side to form a battery cell pack.

[0051] like Figure 2 As shown, the crossbeam assembly 1 also includes a first rivet nut 14 disposed on the fixed beam 11, and a first fastener 13 can be connected to the first rivet nut 14. The first fastener 13 is preferably a bolt. When the first fastener 13 is tightened with the first rivet nut 14, the second inclined surface 1221 presses against the first inclined surface 1121, at which time the fixed beam 11 and the movable beam 12 are relatively fixed; when the first fastener 13 is loosened with the first rivet nut 14, the second inclined surface 1221 can slide relative to the first inclined surface 1121, because the movable beam 12 is provided with a first strip hole 1231, and after the movable beam 12 moves, the relative fixation of the fixed beam 11 and the movable beam 12 can still be achieved through the first fastener 13 and the first rivet nut 14.

[0052] like Figures 3 to 5As shown, the fixed beam 11 has a first contact surface 1111 on the side opposite to the movable beam 12, which can be in contact with the battery cell 20. The movable beam 12 has a second contact surface 1211 on the side opposite to the fixed beam 11, which can be in contact with the battery cell 20. By providing the first contact surface 1111 and the second contact surface 1211, the contact degree between the fixed beam 11 and the movable beam 12 and the battery cell 20 can be improved, thereby further improving the pressing effect on the battery cell 20.

[0053] Furthermore, the fixed beam 11 is provided with a plurality of reinforcing ribs 112, each reinforcing rib 112 having the aforementioned first inclined surface 1121; the movable beam 12 is provided with a plurality of first protrusions 122, each first protrusion 122 having the aforementioned second inclined surface 1221, and the reinforcing ribs 112 form insertion holes for the first protrusions 122 to extend into. This arrangement improves the stability of the movable beam 12 when moving relative to the fixed beam 11, preventing misalignment between the movable beam 12 and the fixed beam 11.

[0054] Specifically, refer to Figure 3 and Figure 4 The fixed beam 11 includes a first plate 111 and the aforementioned reinforcing rib 112, which are connected together. The reinforcing rib 112 is a mesh-like reinforcing rib. The first plate 111 has the aforementioned first mating surface 1111. The aforementioned first press-fit nut 14 is installed on the reinforcing rib 112.

[0055] Reference Figure 5 The movable beam 12 includes a second plate 121, on which a first protrusion 122 and a second protrusion 123 are provided. The second plate 121 has the aforementioned second contact surface 1211. The first protrusion 122 has the aforementioned second inclined surface 1221. The second protrusion 123 has the aforementioned first strip-shaped hole 1231.

[0056] It should be noted that there are multiple second protrusions 123, multiple corresponding first strip holes 1231, and multiple first fasteners 13 and first rivet nuts 14, which can improve the stability of the fixed beam 11 and the movable beam 12 when they are relatively fixed.

[0057] like Figure 6 As shown, this embodiment of the present disclosure also provides a lower housing, which includes a housing frame 2, and the aforementioned fixing beam 11 is installed on the inner side of the housing frame 2.

[0058] Furthermore, the lower housing also includes a liquid cooling plate 3 and a first fastening assembly 5, with the housing frame 2 and the liquid cooling plate 3 forming a cavity 10 capable of accommodating the battery cell assembly.

[0059] Both the fixed beam 11 and the liquid cooling plate 3 are provided with first through holes 101, and at least one first through hole 101 is a strip-shaped hole extending along the moving direction of the movable beam 12 relative to the fixed beam 11. The first fastening component 5 is inserted through the two first through holes 101 to achieve relative fixation of the fixed beam 11 and the liquid cooling plate 3.

[0060] It is understandable that by setting the first through hole 101 on the fixed beam 11 and / or the liquid cooling plate 3 as a strip hole, the installation position of the fixed beam 11 can be adjusted, so that the fixed beam 11 can cooperate with the box frame 2 of the lower box to press against the battery cell group. Then, the movable beam 12 presses against another battery cell group, that is, both sides of the crossbeam assembly 1 can press against the battery cell group.

[0061] It should be noted that the lower housing may include one or more crossbeam assemblies 1. When there is one crossbeam assembly 1, both the fixed beam 11 and the movable beam 12 cooperate with the housing frame 2 to abut the battery cell assembly. When there are multiple crossbeam assemblies 1, two adjacent crossbeam assemblies 1 can also abut the battery cell assembly through the cooperation of the fixed beam 11 and the movable beam 12.

[0062] Furthermore, both the fixed beam 11 and the liquid cooling plate 3 are provided with multiple first through holes 101, which correspond one-to-one, and at least one of the two corresponding first through holes 101 is a strip-shaped hole. This arrangement allows the liquid cooling plate 3 and the fixed beam 11 to be fixed by multiple first fastening components 5, improving the connection stability between the fixed beam 11 and the liquid cooling plate 3, and also allows the fixed beam 11 to maintain a tight contact with the battery cell assembly, improving the assembly stability of the battery cell assembly.

[0063] like Figure 7 As shown, the first fastening assembly 5 includes a protruding stud 51 and a nut 52. The protruding stud 51 passes through two first through holes 101, and the nut 52 is threadedly connected to the protruding stud 51. By using the protruding stud 51 and the nut 52, the installation and removal of the liquid cooling plate 3 and the fixing beam 11 are facilitated.

[0064] Furthermore, the first through hole 101 on the liquid cooling plate 3 is a countersunk hole, and the head of the protruding stud 51 is located inside the countersunk hole after installation. By setting the first through hole 101 on the liquid cooling plate 3 as a countersunk hole, the head of the protruding stud 51 can be hidden, preventing the head of the protruding stud 51 from protruding and affecting the arrangement of the lower housing.

[0065] Reference Figure 7 For example, the first through hole 101 on the fixed beam 11 is a strip hole, and the first through hole 101 on the liquid cooling plate 3 is a circular hole and a countersunk hole. Optionally, the first through hole 101 on the liquid cooling plate 3 can also be a strip hole, or both the first through hole 101 on the fixed beam 11 and the liquid cooling plate 3 can be strip holes.

[0066] Refer again Figure 3 The aforementioned fixed beam 11 also includes a mounting cylinder 113, which penetrates the reinforcing rib 112. The inner cavity of the mounting cylinder 113 forms the aforementioned first through hole 101. By providing the mounting cylinder 113, space is provided for the installation of the first fastening component 5. The nut 52 can be placed in the inner cavity of the mounting cylinder 113. The protruding stud 51 extends into the mounting cylinder 113 to connect the nut 52, avoiding other structures and facilitating the installation of the protruding stud 51 and the nut 52.

[0067] like Figure 6 , Figure 8 and Figure 9 As shown, the lower housing also includes a crossbeam transition block 4. At least two crossbeam transition blocks 4 are provided on the inner side of the housing frame 2, and the fixed beam 11 is connected between the two crossbeam transition blocks 4. Both the crossbeam transition block 4 and the corresponding fixed beam 11 have a second through hole 102 at one end, and at least one of the second through holes 102 is a strip-shaped hole extending along the moving direction of the movable beam 12 relative to the fixed beam 11. The second fastener 8 passes through the two second through holes 102 to achieve relative fixation of the fixed beam 11 and the crossbeam transition block 4.

[0068] Furthermore, both the crossbeam adapter block 4 and the corresponding fixed beam 11 have multiple second through holes 102 at one end, and they correspond one-to-one. At least one of the two corresponding second through holes 102 is a strip hole. This arrangement allows the crossbeam adapter block 4 and the fixed beam 11 to be fixed by multiple second fastening components 6, improving the connection stability between the crossbeam adapter block 4 and the fixed beam 11, and ensuring that the fixed beam 11 stably maintains a tight contact with the battery cell assembly, thereby improving the assembly stability of the battery cell assembly.

[0069] For example, such as Figure 8 and Figure 9 As shown, the crossbeam transition block 4 has two second through holes 102, and correspondingly, the fixed beam 11 also has two second through holes 102 at one end of the crossbeam transition block 4. Optionally, the number of second through holes 102 on the crossbeam transition block 4 and the fixed beam 11 can be set according to actual needs.

[0070] like Figure 9 As shown, the second fastening component 6 includes a bolt 61 and a second press-fit nut 62, which is disposed on the crossbeam adapter block 4.

[0071] Furthermore, such as Figure 8 and Figure 9As shown, the crossbeam adapter block 4 includes a base plate 41 and a mounting plate 42. The mounting plate 42 is connected to the base plate 41. A second through hole 102 is provided on the mounting plate 42. The fixed beam 11 is mounted on the mounting plate 42, and the second rivet nut 62 is located on the side of the mounting plate 42 away from the fixed beam 11. With this arrangement, the bolt 61 passes through the two second through holes 102 and engages with the second rivet nut 62, making operation convenient and facilitating the connection between the fixed beam 11 and the crossbeam adapter block 4.

[0072] It should be noted that the aforementioned base plate 41 can be connected to the box frame 2 by means of bolts, welding, etc., and no specific limitation is made here.

[0073] Furthermore, the aforementioned beam transition block 4 also includes reinforcing ribs 43, which are connected to the mounting plate 42 and the base plate 41. At least two reinforcing ribs 43 are provided, with adjacent reinforcing ribs 43 forming a space between them to limit and fix the beam 11. By providing reinforcing ribs 43, not only can the structural strength of the beam transition block 4 be improved, but the fixing beam 11 can also be limited by the reinforcing ribs 43, facilitating the assembly of the fixing beam 11 and improving the connection stability between the fixing beam 11 and the beam transition block 4.

[0074] It should be noted that the base plate 41, mounting plate 42, and reinforcing rib plate 43 constituting the crossbeam transition block 4 are integrally formed, preferably by casting. The material of the crossbeam transition block 4 is preferably aluminum, which has good thermal conductivity, high strength, and can also enhance the heat dissipation effect on the battery cell assembly.

[0075] For reference again Figure 3 The fixed beam 11 also includes a connecting part 114 that connects to the first plate 111 and the reinforcing rib 112, and the connecting part 114 is provided with the aforementioned second through hole 102. There are two connecting parts 114, and the two connecting parts 114 are respectively connected to the two crossbeam transition blocks 4.

[0076] It should be noted that the first plate 111, reinforcing rib 112, mounting cylinder 113, and connecting part 114 constituting the fixing beam 11 are integrally formed, preferably by casting. The fixing beam 11 is preferably made of aluminum, which has good thermal conductivity and high strength, thus improving the heat dissipation effect on the battery cell assembly. Optionally, the first plate 111, reinforcing rib 112, mounting cylinder 113, and connecting part 114 can also be provided separately.

[0077] Based on the same inventive concept, this disclosure also provides a housing, including the aforementioned lower housing. This housing has the same technical effects as the lower housing in the above embodiments, which will not be repeated here.

[0078] Based on the same inventive concept, this disclosure also provides a battery pack, including the aforementioned housing. This battery pack possesses the corresponding technical effects of the aforementioned housing, which will not be elaborated further here.

[0079] Example 2

[0080] This disclosure provides a crossbeam assembly 1 suitable for the lower housing of a battery pack. The crossbeam assembly 1 includes a fixed beam 11, a movable beam 12, and a first fastener 13. The fixed beam 11 has a first inclined surface, and the movable beam 12 has a second inclined surface capable of sliding along the first inclined surface. The movable beam 12 has a first slot extending in the direction of movement relative to the fixed beam 11. The first fastener 13 passes through the first slot and is detachably connected to the fixed beam 11 to achieve relative fixation between the fixed beam 11 and the movable beam 12.

[0081] The structure of the fixed beam 11 described above may be the same as or different from the structure of the fixed beam in Embodiment 1. The structure of the movable beam 12 described above may be the same as or different from the structure of the movable beam 12 in Embodiment 1.

[0082] like Figure 10 and Figure 11 As shown, this embodiment of the present disclosure provides a lower housing, which includes a housing frame 2, and the aforementioned fixing beam 11 is installed on the inner side of the housing frame 2. The fixing beam 11 is connected to the housing frame 2 of the lower housing and is located on the inner side of the housing frame 2. Unlike the first embodiment, the position of the fixing beam 11 is not adjustable after it is fixed. That is, the crossbeam assembly 1 can only adjust the position of the movable beam 12 relative to the fixing beam 11, while the position of the fixing beam 11 remains unchanged after installation. In this case, the movable beam 12 can cooperate with the housing frame 2 to abut against the battery cell assembly, and the movable beam 12 can also cooperate with the fixing beam 11 of another crossbeam assembly 1 to abut against the battery cell assembly.

[0083] Furthermore, the lower housing also includes a side transition block 7, and at least two side transition blocks 7 are provided on the inner side of the housing frame 2. A third inclined surface 71 parallel to or coplanar with the first inclined surface 1121 is provided on the side transition block 7, and a fourth inclined surface that can slide along the third inclined surface 71 is provided on the movable beam 12.

[0084] It is understandable that by providing a third inclined surface 71 on the side transition block 7 and a fourth inclined surface on the movable beam 12, the movable beam 12 can be moved relative to the side transition block 7 when it is moved. The side transition block 7 can be connected to the frame of the box by welding, screwing, or other methods, and no specific restrictions are made here.

[0085] Furthermore, the lower housing also includes a second fastener 8. The movable beam 12 has a second strip hole extending in the direction of movement of the movable beam 12 relative to the fixed beam 11. The second fastener 8 passes through the second strip hole and is detachably connected to the side adapter block 7.

[0086] By providing a second strip-shaped hole, the movable beam 12 can be moved by the opposite side adapter block 7, and can still be fixed by the second fastener 8 after the movable beam 12 is moved.

[0087] Furthermore, the second fastener 8 is preferably a bolt, and a corresponding rivet nut is provided on the side adapter block 7. The bolt and the rivet nut cooperate to achieve relative fixation of the movable beam 12 and the side adapter block 7.

[0088] It is understandable that the fixed beam 11 and the side transition block 7 can be set separately to adjust the position of the movable beam 12. Therefore, the lower box can be equipped with only the fixed beam 11, only the side transition block 7, or both the fixed beam 11 and the side transition block 7.

[0089] Based on the same inventive concept, this disclosure also provides a housing, including the aforementioned lower housing. This housing has the same technical effects as the lower housing in the above embodiments, which will not be repeated here.

[0090] Based on the same inventive concept, this disclosure also provides a battery pack, including the aforementioned housing. This battery pack possesses the corresponding technical effects of the aforementioned housing, which will not be elaborated further here.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A crossbeam assembly suitable for the lower casing of a battery pack, characterized in that, The device includes a fixed beam, a movable beam, and a first fastener. The fixed beam has a first inclined surface, and the movable beam has a second inclined surface that can slide along the first inclined surface. The movable beam has a first strip hole that extends in the direction of movement of the movable beam relative to the fixed beam. The first fastener passes through the first strip hole and is detachably connected to the fixed beam. The fixed beam is provided with a plurality of reinforcing ribs, each reinforcing rib having the first inclined surface. The movable beam includes a second plate, the second plate being provided with a plurality of first protrusions, each first protrusion having the second inclined surface. The reinforcing ribs form insertion holes for the first protrusions to extend into. The second plate is also provided with a second protrusion, the second protrusion having the first strip-shaped hole.

2. The beam assembly according to claim 1, characterized in that, The fixed beam has a first contact surface on the side opposite to the movable beam that can be in contact with the battery cell; the movable beam has a second contact surface on the side opposite to the fixed beam that can be in contact with the battery cell.

3. A lower housing, characterized in that, Including the beam assembly as described in any one of claims 1-2, the lower housing further includes a housing frame, and the fixing beam is installed on the inner side of the housing frame.

4. The lower housing according to claim 3, characterized in that, The lower housing also includes a side transition block, and at least two of the side transition blocks are provided on the inner side of the housing frame. The side transition block is provided with a third inclined surface that is parallel to or coplanar with the first inclined surface, and the movable beam is provided with a fourth inclined surface that can slide along the third inclined surface.

5. The lower housing according to claim 4, characterized in that, The lower housing also includes a second fastener. The movable beam has a second strip hole extending in the direction of movement of the movable beam relative to the fixed beam. The second fastener passes through the second strip hole and is detachably connected to the side adapter block.

6. The lower housing according to claim 3, characterized in that, The lower housing also includes a liquid cooling plate and a first fastening assembly. The housing frame and the liquid cooling plate form a cavity capable of accommodating the battery cell assembly. Both the fixed beam and the liquid cooling plate are provided with first through holes, and at least one of the first through holes is a strip-shaped hole extending along the moving direction of the movable beam relative to the fixed beam. The first fastening component passes through the two first through holes to achieve relative fixation of the fixed beam and the liquid cooling plate.

7. The lower housing according to claim 6, characterized in that, The lower housing also includes a crossbeam transition block and a second fastening assembly. At least two crossbeam transition blocks are provided on the inner side of the housing frame, and the fixed beam is connected between the two crossbeam transition blocks. Both the crossbeam transition block and the corresponding fixed beam have a second through hole at one end, and at least one of the second through holes is a strip-shaped hole extending along the moving direction of the movable beam relative to the fixed beam. The second fastening component passes through the two second through holes to achieve relative fixation of the fixed beam and the crossbeam transition block.

8. A box, characterized in that, Includes the lower housing as described in any one of claims 3-7.

9. A battery pack, characterized in that, Includes the housing as described in claim 8.

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