A multi-module lithium battery housing

Abstract

This invention relates to the field of lithium battery housing technology and discloses a multi-module lithium battery housing, including a main frame and a cover. The cover is located on top of the main frame and fits snugly against it. An assembly mechanism is provided on the main frame. Through the design of the assembly mechanism, the main frame, first side plate, second side plate, and bottom support plate are combined to form a complete battery housing. Its advantages include flexible disassembly and assembly of each component. After assembly, if extreme collisions or other events cause damage to a part requiring repair or replacement, the damaged part can be quickly removed. Compared to traditional integrated designs that require replacement of the entire unit upon damage, this method is more cost-effective and improves flexibility in use. Furthermore, while achieving these functions, the structural design is simple, which is beneficial for manufacturing and cost control.

Description

Technical Field

[0001] This invention relates to the field of lithium battery housing technology, and in particular to a multi-module lithium battery housing. Background Technology

[0002] A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Unlike rechargeable lithium-ion batteries and lithium-ion polymer batteries, lithium-ion cells do not contain metallic lithium. During charging and discharging, only lithium ions move between the positive and negative electrodes, and the electrodes and electrolyte do not participate in the reaction. A battery module, on the other hand, refers to a module in which multiple cells are connected in series. In battery applications such as new energy vehicles, multiple battery modules are often placed in a battery box to ensure range.

[0003] Chinese patent application CN221304847U discloses a multi-module lithium battery housing, including a cover, a casing, module boxes, cell limiting strips, a BMS protection board, and an electronic control fixing plate. This design enables diversified modular design of high-voltage cells in low-speed new energy vehicles, allowing multiple module boxes to be housed within the same casing. The modules are connected in series and parallel according to PACK requirements. This method reduces the weight of manual handling and assembly during production and welding, and lowers safety hazards; it also facilitates after-sales maintenance.

[0004] The above devices enable the installation of multiple module boxes within the same housing. However, their overall housing structure is similar to existing battery boxes, generally being an integrated structure. The housing itself typically consists of two main components: the shell and the cover. During use, if a certain plane of the battery box is damaged, repair is difficult. In extreme cases, the entire battery box may become unusable due to the inability to properly repair a damaged plane, thus increasing the cost of use. Summary of the Invention

[0005] To address the aforementioned problems, the present invention provides a multi-module lithium battery housing.

[0006] The multi-module lithium battery housing provided by this invention adopts the following technical solution:

[0007] A multi-module lithium battery housing includes a main frame and a cover. The cover is located on the top of the main frame and fits snugly against the top of the main frame. An assembly mechanism is provided on the main frame.

[0008] The combined mechanism includes two first side plates and two second side plates. First mounting grooves are provided on both the front and rear side walls of the main frame of the housing, and second mounting grooves are provided on both the left and right side walls of the main frame of the housing. The two first side plates are respectively disposed within the two first mounting grooves and match the first mounting grooves. The two second side plates are respectively disposed within the two second mounting grooves and match the second mounting grooves. A first sealing strip is fixedly connected inside the first mounting groove, and a second sealing strip is fixedly connected inside the second mounting groove. A first sealing groove is provided on the first side plate, and a second sealing groove is provided on the second side plate. The first sealing strip and the second sealing strip extend into the first sealing groove and the second sealing groove, respectively, and the first sealing strip and the second sealing strip match the first sealing groove and the second sealing groove, respectively.

[0009] A bottom mounting groove is provided on the bottom wall of the main frame of the box. A bottom support plate is placed inside the bottom mounting groove. The top of the bottom support plate is attached to the main frame of the box. A third sealing groove is provided on the top of the bottom support plate. A third sealing strip is fixedly connected in the bottom mounting groove. The third sealing strip extends into the third sealing groove and matches the third sealing groove. A bottom pad is fixedly connected to the top of the bottom support plate.

[0010] By adopting the above technical solution, a complete battery box is assembled by combining the main frame, the first side plate, the second side plate, and the bottom support plate. Its advantage is that each assembly component can be flexibly disassembled and assembled. After assembly, if an extreme collision or other situation causes damage to a certain part that needs to be repaired or replaced, the damaged part can be quickly removed. Compared with the traditional integrated design, which can only replace the whole body when damaged, it is more cost-effective and improves the flexibility of use.

[0011] Preferably, the main frame of the box is provided with first positioning bolts on both the front and rear sides, and the first positioning bolts extend into the first mounting groove. The main frame of the box is provided with second positioning bolts on both the left and right sides, and the second positioning bolts extend into the second mounting groove. The first positioning bolts and the second positioning bolts are both threaded to the main frame of the box. A first washer is fixedly connected to one end of the first positioning bolt, and a second washer is fixedly connected to one end of the second positioning bolt. The first washer and the second washer are respectively attached to the first side plate and the second side plate.

[0012] By adopting the above technical solution, the first gasket and the second gasket are in contact with the first side plate and the second side plate, which can increase the contact area and avoid damage to the outer surface of the first side plate and the second side plate due to the clamping force.

[0013] Preferably, two first top plates and two second top plates are slidably connected inside the bottom mounting groove. The two first top plates are respectively disposed at the bottom of the two first side plates, and the two second top plates are respectively disposed at the bottom of the two second side plates. The inner sides of the first and second top plates are in contact with the bottom support plate. A bottom reinforcing beam is placed inside the bottom mounting groove. The top of the bottom reinforcing beam is in contact with the bottom of the first top plate. A bottom buffer pad is fixedly connected to the bottom of the main frame of the box. A third positioning bolt is provided at the bottom of the main frame of the box. The third positioning bolt extends into the bottom mounting groove and is threadedly connected to the main frame of the box.

[0014] By adopting the above technical solution, the first and second top plates have a large contact surface with the bottom of the bottom support plate, which can ensure stable support for the bottom support plate.

[0015] Preferably, the third positioning bolt passes through the bottom buffer pad and the bottom reinforcing beam in sequence, and the bottom of the first top plate and the second top plate are both in contact with one end of the third positioning bolt.

[0016] By adopting the above technical solution, since the bottom support plate needs to directly bear the weight of the battery, the bottom reinforcement beam added at the bottom can effectively improve the bottom support strength.

[0017] Preferably, four side guards are fixedly connected to the outside of the main frame of the box, and the four side guards are rectangular in shape and symmetrically connected to the four sides of the main frame of the box.

[0018] By adopting the above technical solution, the side guard plate provides side impact protection for the main frame of the box.

[0019] Preferably, the top of the main frame of the box is provided with four positioning threaded rods, which are respectively fixedly connected to the four corners of the top of the main frame. The positioning threaded rods pass through the box cover, and a fixing ring is provided on the top of the box cover. The positioning threaded rods pass through the fixing ring and are connected to the fixing ring by threads.

[0020] By adopting the above technical solution, the cover can be quickly removed or fixed to the main frame of the box by twisting the fixing ring to remove or install it on the positioning threaded rod.

[0021] Preferably, a pressure stabilizing assembly is provided inside the main frame of the box. The pressure stabilizing assembly includes two track plates, which are respectively attached to the front and rear side walls of the inner cavity of the main frame of the box. Both track plates are connected to the main frame of the box by a fourth positioning bolt. The track plates are provided with sliding grooves. A horizontal plate is provided between the two track plates. The two ends of the horizontal plate extend into the two sliding grooves and match the sliding grooves. A partition is fixedly connected to the bottom of the horizontal plate. The bottom of the partition is attached to the bottom pad.

[0022] By adopting the above technical solution, the horizontal plate can move flexibly between the two track plates, and the partition plate provides isolation and protection for different battery modules.

[0023] Preferably, a limiting plate is integrally formed on the track plate, the top of the horizontal plate is attached to the bottom of the limiting plate, a threaded limiting rod is fixedly connected to the top of the horizontal plate, the threaded limiting rod passes through the inner side of the limiting plate, a positioning ring is provided on the top of the limiting plate, the threaded limiting rod passes through the positioning ring and is threadedly connected to the positioning ring, and the bottom of the positioning ring is attached to the top of the limiting plate and the top of the track plate respectively.

[0024] By adopting the above technical solution, once the horizontal plate moves to the set position, tightening the positioning ring on the threaded limiting rod will fix the horizontal plate.

[0025] Preferably, the partition plate is provided with a central groove and two auxiliary grooves, which are respectively located on the front and rear sides of the central groove. A pressure plate is provided at the bottom of the horizontal plate, which passes through the central groove and the auxiliary grooves. The pressure plate is slidably connected to the auxiliary grooves. A threaded adjusting rod is rotatably connected inside the central groove. The threaded adjusting rod passes through the horizontal plate and is rotatably connected to the horizontal plate. The threaded adjusting rod passes through the pressure plate and is threadedly connected to the pressure plate.

[0026] By adopting the above technical solution, the pressure plate can press and fix the battery modules placed on both sides of the separator, thereby further improving the stability of the battery modules.

[0027] In summary, the present invention has the following beneficial technical effects:

[0028] 1. This invention, through the design of a combined mechanism, assembles a complete battery box by combining the main frame, first side plate, second side plate, and bottom support plate. Its advantages are that each assembly component can be flexibly disassembled and assembled. After assembly, if an extreme collision or other event causes damage to a certain part that requires repair or replacement, the damaged part can be quickly removed. Compared with the traditional integrated design, which requires replacement of the entire unit when damaged, this invention is more cost-effective and improves the flexibility of use. Furthermore, while achieving the above functions, the structural design is simple, which is beneficial for manufacturing and controlling usage costs.

[0029] 2. This invention, through the design of the pressure stabilizing component, allows for flexible adjustment of the number of partitions between the two track plates to accommodate different layout requirements. Once the number of partitions is selected, the horizontal plate is directly pushed to further adapt to the spacing requirements of different battery modules. Finally, the threaded adjustment rod is rotated to control the pressure plate to move downwards and press down on the top of the battery module, thereby improving the stability of the battery module. Correspondingly, through the above operations, it can flexibly match the installation and fixing requirements of multiple battery modules, making it more flexible to use and with a wider range of applications. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a bottom view of the structure of the present invention;

[0032] Figure 3 This is a split view of the box cover and the main frame of the box body in this invention;

[0033] Figure 4 for Figure 3 Enlarged view of point A in the image;

[0034] Figure 5 This is a cross-sectional view of the bottom reinforcing beam in this invention;

[0035] Figure 6 for Figure 5 Enlarged view of point B in the image;

[0036] Figure 7 This is a cross-sectional view of the main frame of the box in this invention;

[0037] Figure 8 for Figure 7 Enlarged view of point C in the image;

[0038] Figure 9 This is a structural breakdown diagram of the present invention;

[0039] Figure 10 for Figure 9 Enlarged view of point D in the image;

[0040] Figure 11 for Figure 9 Enlarged view of point E in the image;

[0041] Figure 12 This is a split view of the track plate and the cross plate in this invention;

[0042] Figure 13 This is a schematic diagram of the partition structure in this invention;

[0043] Figure 14 This is a schematic diagram of the track slab structure in this invention.

[0044] Explanation of reference numerals in the attached drawings: 1. Main frame of the enclosure; 2. Enclosure cover; 3. Assembly mechanism; 31. First side plate; 32. Second side plate; 33. First mounting groove; 34. Second mounting groove; 35. First sealing strip; 36. Second sealing strip; 37. First sealing groove; 38. Second sealing groove; 39. Bottom mounting groove; 391. Bottom support plate; 392. Third sealing groove; 393. Third sealing strip; 394. Bottom pad; 395. First positioning bolt; 396. Second positioning bolt; 397. ... 398. First gasket; 399. Second gasket; 381. First top plate; 382. Second top plate; 383. Bottom reinforcing beam; 384. Bottom buffer pad; 385. Third positioning bolt; 386. Side guard plate; 387. Positioning threaded rod; 388. Fixing ring; 4. Pressure stabilizing assembly; 41. Track plate; 42. Sliding groove; 43. Horizontal plate; 44. Partition plate; 45. Limiting plate; 46. Threaded limiting rod; 47. Positioning ring; 48. Intermediate groove; 49. Auxiliary groove; 491. Pressure plate; 492. Threaded adjusting rod. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1 -Appendix Figure 14 The present invention will be described in further detail below.

[0046] The present invention discloses a multi-module lithium battery box, including a main frame 1 and a cover 2. The cover 2 is disposed on the top of the main frame 1 and is attached to the top of the main frame 1. A combination mechanism 3 is provided on the main frame 1.

[0047] The assembly mechanism 3 includes two first side plates 31 and two second side plates 32. First mounting grooves 33 are provided on both the front and rear side walls of the main frame 1, and second mounting grooves 34 are provided on both the left and right side walls of the main frame 1. The two first side plates 31 are respectively disposed inside the two first mounting grooves 33 and match the first mounting grooves 33. The two second side plates 32 are respectively disposed inside the two second mounting grooves 34 and match the second mounting grooves 34. A first sealing strip 35 is fixedly connected inside the first mounting groove 33, and a second sealing strip 36 is fixedly connected inside the second mounting groove 34. A first sealing groove 37 is provided on the first side plate 31, and a second sealing groove 38 is provided on the second side plate 32. The first sealing strip 35 and the second sealing strip 36 extend into the first sealing groove 37 and the second sealing groove 38, respectively, and the first sealing strip 35 and the second sealing strip 36 match the first sealing groove 37 and the second sealing groove 38, respectively.

[0048] A bottom mounting groove 39 is provided on the bottom wall of the main frame 1 of the enclosure. A bottom support plate 391 is placed inside the bottom mounting groove 39. The top of the bottom support plate 391 is attached to the main frame 1 of the enclosure. A third sealing groove 392 is provided on the top of the bottom support plate 391. A third sealing strip 393 is fixedly connected inside the bottom mounting groove 39. The third sealing strip 393 extends into the third sealing groove 392 and matches the third sealing groove 392. A bottom pad 394 is fixedly connected to the top of the bottom support plate 391. The main frame 1, the first side plate 31, the second side plate 32 and the bottom support plate 391 are combined to form a complete battery enclosure. Its advantage is that each assembly component can be flexibly disassembled and assembled. After assembly, if a part is damaged due to extreme collision or other circumstances and needs to be repaired or replaced, the damaged part can be quickly removed. Compared with the traditional integrated design, which can only replace the whole when damaged, it is more cost-effective and improves the flexibility of use.

[0049] The main frame 1 of the housing is provided with first positioning bolts 395 on both the front and rear sides, and the first positioning bolts 395 extend into the interior of the first mounting groove 33. The main frame 1 of the housing is provided with second positioning bolts 396 on both the left and right sides, and the second positioning bolts 396 extend into the interior of the second mounting groove 34. The first positioning bolts 395 and the second positioning bolts 396 are both connected to the main frame 1 of the housing by threads. One end of the first positioning bolt 395 is fixedly connected to a first washer 397, and one end of the second positioning bolt 396 is fixedly connected to a second washer 398. The first washer 397 and the second washer 398 are respectively attached to the first side plate 31 and the second side plate 32. The contact between the first washer 397 and the second washer 398 and the first side plate 31 and the second side plate 32 can increase the contact area and avoid damage to the outer surface of the first side plate 31 and the second side plate 32 due to the clamping force.

[0050] Two first top plates 399 and two second top plates 381 are slidably connected inside the bottom mounting groove 39. The two first top plates 399 are respectively set at the bottom of the two first side plates 31, and the two second top plates 381 are respectively set at the bottom of the two second side plates 32. The inner sides of the first top plates 399 and the second top plates 381 are in contact with the bottom support plate 391. A bottom reinforcing beam 382 is placed inside the bottom mounting groove 39. The top of the bottom reinforcing beam 382 is in contact with the bottom of the first top plate 399. A bottom buffer pad 383 is fixedly connected to the bottom of the main frame 1 of the box. A third positioning bolt 384 is set at the bottom of the main frame 1 of the box. The third positioning bolt 384 extends into the bottom mounting groove 39 and is connected to the main frame 1 of the box by threads. The first top plates 399 and the second top plates 381 have a large contact surface with the bottom of the bottom support plate 391, which can ensure stable support for the bottom support plate 391.

[0051] The third positioning bolt 384 passes through the bottom buffer pad 383 and the bottom reinforcing beam 382 in sequence. The bottom of the first top plate 399 and the second top plate 381 are both in contact with one end of the third positioning bolt 384. Since the bottom support plate 391 needs to directly bear the weight of the battery, the bottom reinforcing beam 382 added at the bottom can effectively improve the bottom support strength. Four side guard plates 385 are fixedly connected to the outside of the main frame 1 of the enclosure. The four side guard plates 385 are rectangular and symmetrical, respectively, and are attached to the four sides of the main frame 1 of the enclosure. The side guard plates 385 are attached to the main frame of the enclosure. 1. Provides side impact protection. The top of the main frame 1 of the enclosure is provided with four positioning threaded rods 386. The four positioning threaded rods 386 are fixedly connected to the four corners of the top of the main frame. The positioning threaded rods 386 pass through the cover 2. The top of the cover 2 is provided with a fixing ring 387. The positioning threaded rods 386 pass through the fixing ring 387 and are connected to the fixing ring 387 by threads. By twisting the fixing ring 387 to remove or install it on the positioning threaded rods 386, the cover 2 can be quickly removed or fixed to the main frame 1 of the enclosure.

[0052] The main frame 1 of the enclosure is equipped with a pressure stabilizing assembly 4, which includes two track plates 41. The two track plates 41 are respectively attached to the front and rear side walls of the inner cavity of the main frame 1, and both track plates 41 are connected to the main frame 1 by a fourth positioning bolt. The track plates 41 are provided with sliding grooves 42. A horizontal plate 43 is provided between the two track plates 41. The two ends of the horizontal plate 43 extend into the two sliding grooves 42 and match the sliding grooves 42. A partition plate 44 is fixedly connected to the bottom of the horizontal plate 43. The bottom of the partition plate 44 is attached to the bottom pad 394. The horizontal plate 43 can move flexibly horizontally between the two track plates 41. The separator 44 provides isolation and protection for different battery modules. The track plate 41 is integrally formed with a limiting plate 45. The top of the horizontal plate 43 is attached to the bottom of the limiting plate 45. A threaded limiting rod 46 is fixedly connected to the top of the horizontal plate 43. The threaded limiting rod 46 passes through the inner side of the limiting plate 45. A positioning ring 47 is provided on the top of the limiting plate 45. The threaded limiting rod 46 passes through the positioning ring 47 and is threadedly connected to the positioning ring 47. The bottom of the positioning ring 47 is attached to the top of the limiting plate 45 and the track plate 41 respectively. When the horizontal plate 43 moves to the set position, the positioning ring 47 is tightened on the threaded limiting rod 46 to fix the horizontal plate 43.

[0053] The partition 44 is provided with a central groove 48 and two auxiliary grooves 49. The two auxiliary grooves 49 are respectively located on the front and rear sides of the central groove 48. A pressure plate 491 is provided at the bottom of the horizontal plate 43. The pressure plate 491 passes through the central groove 48 and the auxiliary grooves 49. The pressure plate 491 is slidably connected to the auxiliary grooves 49. A threaded adjusting rod 492 is rotatably connected inside the central groove 48. The threaded adjusting rod 492 passes through the horizontal plate 43 and is rotatably connected to the horizontal plate 43. The threaded adjusting rod 492 passes through the pressure plate 491 and is threadedly connected to the pressure plate 491. The pressure plate 491 can press and fix the battery modules placed on both sides of the partition 44 to further improve the stability of the battery modules.

[0054] In actual operation, when this device is assembled, the first side plate 31 and the second side plate 32 are inserted into the top openings of the first mounting groove 33 and the second mounting groove 34, respectively. After insertion, the first positioning bolt 395 and the second positioning bolt 396 are rotated respectively. As the first positioning bolt 395 and the second positioning bolt 396 move, the first gasket 397 and the second gasket 398 are driven to contact the first side plate 31 and the second side plate 32, respectively. As they continue to move, the first side plate 31 and the second side plate 32 are pushed to the inner wall of the first mounting groove 33 and the second mounting groove 34. At the same time, the first sealing strip 35 and the second sealing strip 36 extend into the first sealing groove 37 and the second sealing groove 38, respectively, thereby improving the sealing of the splicing part between the two and the main frame 1 of the box.

[0055] Subsequently, the bottom support plate 391 is inserted through the side opening of the bottom mounting slot 39. The bottom pad 394 on top of the bottom support plate 391 provides bottom cushioning protection for the battery module when it is placed. After the bottom support plate 391 is placed, the bottom reinforcing beam 382 is placed in the bottom mounting slot 39 and placed at the bottom of the first top plate 399. At this time, the bottom reinforcing beam 382 provides support for the first top plate 399. Then, the third positioning bolt 384 is screwed in. At this time, the third positioning bolt 384 pushes the first top plate 399 and the second top plate 381 upward. Through the above operations, it can be seen that the first top plate 399 and the second top plate 381 provide stable support for the bottom of the bottom support plate 391. Since the bottom support plate 391 needs to bear the weight of the placed battery module, the addition of the bottom reinforcing beam 382 can effectively improve the stability of the bottom support plate 391. The high base plate 391 provides stable support for the battery module. After the base plate 391 is installed, the third sealing strip 393 is also inserted into the third sealing groove 392, which can ensure the sealing performance of the connection between the base plate 391 and the main frame 1 of the box. This effectively prevents external moisture and other substances from entering and causing damage to the battery. The main frame 1, the first side plate 31, the second side plate 32 and the base plate 391 are combined to form a complete battery box. Its advantage is that each assembly component can be flexibly disassembled and assembled. After assembly, if an extreme collision or other situation causes damage to a certain part that needs to be repaired or replaced, the damaged part can be quickly removed. Compared with the traditional integrated design, which can only replace the whole body when damaged, it is more cost-effective and improves the flexibility of use.

[0056] When installing the cover 2, after the cover 2 is placed on the top wall of the box, the positioning threaded rod 386 passes through the cover 2. After screwing the fixing ring 387 on the outside of the positioning threaded rod 386, the cover 2 can be fixed. Similarly, when removing the cover 2, the cover 2 can be removed by removing the fixing ring 387. The operation threshold is low and it is easy to get started.

[0057] Finally, when placing multiple modules, the internal layout will change accordingly due to the different sizes of the modules. The track plate 41 is connected to the main frame 1 of the housing by bolts, which can also be easily disassembled. Before the track plate 41 is installed inside the main frame 1 of the housing, the opening between the limiting plate 45 and the track plate 41 can be slid out or the horizontal plate 43 can be inserted to increase the number of partitions 44 to accommodate different layout requirements. After the number of partitions 44 is selected, the horizontal plate 43 can be pushed directly to adjust the spacing between adjacent horizontal plates 43 to further adapt to different layout requirements. To accommodate the spacing requirements of different battery modules, after adjustment, tighten the positioning ring 47 outside the threaded limiting rod 46. At this time, the horizontal plate 43 can maintain its adjusted position. Fix the track plate 41 inside the main frame 1 of the housing with bolts. Finally, rotate the threaded adjusting rod 492. The threaded adjusting rod 492 drives the pressure plate 491 to move. After the pressure plate 491 moves downward, it presses down on the top of the battery module, thereby improving the stability of the battery module. Correspondingly, through the above operations, the installation and fixing requirements of multiple battery modules can be flexibly matched, making it more flexible to use and with a wider range of applications.

[0058] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multi-module lithium battery housing, comprising a main frame (1) and a cover (2), characterized in that: The lid (2) is located on the top of the main frame (1) of the box body, and the lid (2) is attached to the top of the main frame (1) of the box body. The main frame (1) of the box body is provided with a combination mechanism (3). The combined mechanism (3) includes two first side plates (31) and two second side plates (32). First mounting slots (33) are provided on both the front and rear side walls of the main frame (1), and second mounting slots (34) are provided on both the left and right side walls of the main frame (1). The two first side plates (31) are respectively disposed inside the two first mounting slots (33) and match the first mounting slots (33). The two second side plates (32) are respectively disposed inside the two second mounting slots (34) and match the second mounting slots (34). The first mounting slots (33)... A first sealing strip (35) is fixedly connected inside the second mounting groove (34), and a second sealing strip (36) is fixedly connected inside the second mounting groove (34). A first sealing groove (37) is opened on the first side plate (31), and a second sealing groove (38) is opened on the second side plate (32). The first sealing strip (35) and the second sealing strip (36) extend into the first sealing groove (37) and the second sealing groove (38) respectively, and the first sealing strip (35) and the second sealing strip (36) match the first sealing groove (37) and the second sealing groove (38) respectively. The bottom wall of the main frame (1) of the box body is provided with a bottom mounting groove (39), and a bottom support plate (391) is placed inside the bottom mounting groove (39). The top of the bottom support plate (391) is attached to the main frame (1) of the box body. A third sealing groove (392) is provided on the top of the bottom support plate (391). A third sealing strip (393) is fixedly connected inside the bottom mounting groove (39). The third sealing strip (393) extends into the third sealing groove (392) and matches the third sealing groove (392). A bottom pad plate (394) is fixedly connected to the top of the bottom support plate (391). The main frame (1) of the box is equipped with a pressure stabilizing component (4). The pressure stabilizing component (4) includes two track plates (41). The two track plates (41) are respectively attached to the front and rear side walls of the inner cavity of the main frame (1), and both track plates (41) are connected to the main frame (1) of the box by a fourth positioning bolt. The track plates (41) are provided with sliding grooves (42). A horizontal plate (43) is provided between the two track plates (41). The two ends of the horizontal plate (43) extend into the two sliding grooves (42) and match the sliding grooves (42). A partition plate (44) is fixedly connected to the bottom of the horizontal plate (43). The bottom of the partition plate (44) is attached to the bottom pad plate (394). A limit plate (45) is integrally formed on the track plate (41). The top of the horizontal plate (43) is attached to the bottom of the limit plate (45). A threaded limiting rod (46) is fixedly connected to the top of the horizontal plate (43). The threaded limiting rod (46) passes through the inner side of the limit plate (45). A positioning ring (47) is provided on the top of the limit plate (45). The threaded limiting rod (46) passes through the positioning ring (47) and is connected to the positioning ring (47) by threads. The bottom of the positioning ring (47) is attached to the top of the limit plate (45) and the track plate (41) respectively.

2. The multi-module lithium battery housing according to claim 1, characterized in that: The main frame (1) of the box body is provided with first positioning bolts (395) on both the front and rear sides. The first positioning bolts (395) extend into the first mounting groove (33). The main frame (1) of the box body is provided with second positioning bolts (396) on both the left and right sides. The second positioning bolts (396) extend into the second mounting groove (34). The first positioning bolts (395) and the second positioning bolts (396) are both connected to the main frame (1) of the box body by threads. One end of the first positioning bolt (395) is fixedly connected to a first washer (397), and one end of the second positioning bolt (396) is fixedly connected to a second washer (398). The first washer (397) and the second washer (398) are respectively attached to the first side plate (31) and the second side plate (32).

3. The multi-module lithium battery housing according to claim 1, characterized in that: The bottom mounting groove (39) is slidably connected to two first top plates (399) and two second top plates (381). The two first top plates (399) are respectively located at the bottom of the two first side plates (31), and the two second top plates (381) are respectively located at the bottom of the two second side plates (32). The inner sides of the first top plates (399) and the second top plates (381) are in contact with the bottom support plate (391). The bottom mounting groove (39) is filled with a bottom reinforcing beam (382). The top of the bottom reinforcing beam (382) is in contact with the bottom of the first top plate (399). The bottom of the main frame (1) of the box is fixedly connected with a bottom buffer pad (383). The bottom of the main frame (1) of the box is provided with a third positioning bolt (384). The third positioning bolt (384) extends into the bottom mounting groove (39) and is connected to the main frame (1) of the box by threads.

4. A multi-module lithium battery housing according to claim 3, characterized in that: The third positioning bolt (384) passes through the bottom buffer pad (383) and the bottom reinforcing beam (382) in sequence, and the bottom of the first top plate (399) and the second top plate (381) are both in contact with one end of the third positioning bolt (384).

5. A multi-module lithium battery housing according to claim 1, characterized in that: The main frame (1) of the box is fixedly connected to four side guards (385), which are rectangular in shape and symmetrically connected to the four sides of the main frame (1).

6. A multi-module lithium battery housing according to claim 1, characterized in that: The main frame (1) of the box is provided with four positioning threaded rods (386) at the top. The four positioning threaded rods (386) are fixedly connected to the four corners of the top of the main frame. The positioning threaded rods (386) penetrate the box cover (2). The top of the box cover (2) is provided with a fixing ring (387). The positioning threaded rods (386) penetrate the fixing ring (387) and are connected to the fixing ring (387) by threads.

7. A multi-module lithium battery housing according to claim 1, characterized in that: The partition (44) is provided with a central groove (48) and two auxiliary grooves (49). The two auxiliary grooves (49) are respectively located on the front and rear sides of the central groove (48). A pressure plate (491) is provided at the bottom of the horizontal plate (43). The pressure plate (491) passes through the central groove (48) and the auxiliary grooves (49). The pressure plate (491) is slidably connected to the auxiliary grooves (49). A threaded adjusting rod (492) is rotatably connected inside the central groove (48). The threaded adjusting rod (492) passes through the horizontal plate (43) and is rotatably connected to the horizontal plate (43). The threaded adjusting rod (492) passes through the pressure plate (491) and is threadedly connected to the pressure plate (491).

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