Hot pressing device

Abstract

The utility model discloses a hot pressing device which comprises a machine frame, an upper-layer hot pressing mechanism, a middle-layer hot pressing mechanism and a lower-layer hot pressing mechanism. The upper-layer hot pressing mechanism comprises an upper-layer installation plate and an upper-layer heating plate arranged at the bottom of the upper-layer installation plate. The middle-layer hot-pressing mechanism comprises a middle-layer mounting plate, a first middle-layer heating plate arranged at the top of the middle-layer mounting plate and a second middle-layer heating plate arranged at the bottom of the middle-layer mounting plate, the lower-layer hot-pressing mechanism comprises a lower-layer mounting plate and a lower-layer heating plate arranged at the top of the lower-layer mounting plate, and the lower-layer mounting plate is arranged at the bottom in the rack; the upper-layer hot-pressing mechanism further comprises two upper-layer heating blocks which are oppositely arranged, and the middle-layer hot-pressing mechanism further comprises two first middle-layer heating blocks which are oppositely arranged, a middle-layer mounting block, two second middle-layer heating blocks which are oppositely arranged and a middle-layer driving assembly. According to the utility model, the hot-pressing shaping time can be shortened, and the hot-pressing shaping efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, specifically to a hot pressing device. Background Technology

[0002] Lithium-ion battery cells formed using a lamination process generally have a relatively loose structure, thus requiring hot-pressing to shape the laminated cells. Currently, hot-pressing equipment is commonly used for this process.

[0003] Existing hot pressing devices generally include a frame, an upper hot pressing mechanism, a middle hot pressing mechanism, and a lower hot pressing mechanism. Two frame openings are provided on each side of the frame, and the upper, middle, and lower hot pressing mechanisms are arranged sequentially from top to bottom. The upper hot pressing mechanism includes an upper mounting plate and an upper heating plate located at the bottom of the upper mounting plate. The upper mounting plate is located within the frame and can move vertically relative to the frame. The middle hot pressing mechanism includes a middle mounting plate, a first middle heating plate located at the top of the middle mounting plate, and a second middle heating plate located at the bottom of the middle mounting plate. The middle mounting plate is located within the frame and can move vertically relative to the frame. The first middle heating plate corresponds to the upper heating plate, and the second middle heating plate corresponds to the first middle heating plate. The lower hot pressing mechanism includes a lower mounting plate and a lower heating plate located at the top of the lower mounting plate. The lower mounting plate is located at the bottom of the frame, and the lower heating plate corresponds to the second middle heating plate. In practical applications, two battery cells are first placed on the lower heating plate and the first middle heating plate, respectively. Then, the middle mounting plate moves the first and second middle heating plates downwards, and the upper mounting plate moves the upper heating plate downwards. Thus, the second middle heating plate can compress the battery cell placed on the lower heating plate and heat the battery cell through the second and lower heating plates. Similarly, the upper heating plate can compress the battery cell placed on the first middle heating plate and heat the battery cell through the first and upper heating plates. This achieves hot-pressing and shaping of the two battery cells.

[0004] In the aforementioned hot-pressing shaping method, since the lower heating plate and the second middle heating plate are in contact with the upper and lower surfaces of the battery cell placed on the lower heating plate, respectively, and the upper heating plate and the first middle heating plate are in contact with the upper and lower surfaces of the battery cell placed on the first middle heating plate, respectively, when the battery cell placed on the lower heating plate is heated by the second middle heating plate and the lower heating plate, and when the battery cell placed on the first middle heating plate is heated by the upper heating plate and the first middle heating plate, the heat penetrates from the upper and lower surfaces of the battery cell into the interior of the battery cell. This process requires a long time for the temperature at the center of the battery cell to reach the specified temperature, resulting in slow battery cell shaping, a long hot-pressing shaping time, and reduced hot-pressing shaping efficiency. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a hot pressing device that can shorten the hot pressing shaping time and improve the hot pressing shaping efficiency.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A hot pressing device includes a frame, an upper hot pressing mechanism, a middle hot pressing mechanism, and a lower hot pressing mechanism. Two first openings are respectively provided on both sides of the frame. The upper, middle, and lower hot pressing mechanisms are arranged sequentially from top to bottom. The upper hot pressing mechanism includes an upper mounting plate and an upper heating plate disposed at the bottom of the upper mounting plate. The upper mounting plate is disposed within the frame and can move vertically relative to the frame. The middle hot pressing mechanism includes a middle mounting plate, a first middle heating plate disposed at the top of the middle mounting plate, and a second middle heating plate disposed at the bottom of the middle mounting plate. A heating plate, the middle mounting plate is disposed within the frame and can move vertically relative to the frame, the first middle heating plate corresponds to the upper heating plate, the second middle heating plate corresponds to the first middle heating plate, the lower heating mechanism includes a lower mounting plate and a lower heating plate disposed on top of the lower mounting plate, the lower mounting plate is disposed at the bottom of the frame, the lower heating plate corresponds to the second middle heating plate, the upper heating mechanism further includes two upper heating blocks disposed opposite each other, the two upper heating blocks are respectively disposed at both ends of the bottom of the upper heating plate, The aforementioned middle-layer hot-pressing mechanism further includes two first middle-layer heating blocks arranged opposite each other, a middle-layer mounting block, two second middle-layer heating blocks arranged opposite each other, and a middle-layer driving assembly. The top of the first middle-layer heating plate is provided with a middle-layer mounting groove. The middle-layer mounting blocks mate with the middle-layer mounting groove, and both ends of the middle-layer mounting blocks protrude from both ends of the first middle-layer heating plate. The two first middle-layer heating blocks are respectively disposed on the top of the middle-layer mounting blocks and correspond to the two upper-layer heating blocks. The middle-layer driving assembly is used to drive the middle-layer mounting blocks to move up and down. Two middle-layer heating blocks are respectively disposed at both ends of the bottom of the second middle-layer heating plate. The lower-layer hot-pressing mechanism also includes two lower-layer heating blocks arranged opposite each other, a lower-layer mounting block, and a lower-layer driving assembly. The top of the lower-layer heating plate is provided with a lower-layer mounting groove. The lower-layer mounting block cooperates with the lower-layer mounting groove, and both ends of the lower-layer mounting block protrude from both ends of the lower-layer heating plate. The two lower-layer heating blocks are respectively disposed on the top of the lower-layer mounting block and correspond to the two second middle-layer heating blocks respectively. The lower-layer driving assembly is used to drive the lower-layer mounting block to move up and down.

[0008] As a preferred technical solution, the hot pressing device further includes a first driving mechanism, which includes an electric cylinder. An upper pressure sensor is provided on the top of the upper mounting plate. The electric cylinder is located at the top of the frame, and the end of the output shaft of the electric cylinder passes through the frame through hole at the top of the frame and is connected to the upper pressure sensor.

[0009] As a preferred technical solution, the frame has two second openings at both ends, and the upper mounting plate has a first upper mounting part and a second upper mounting part at both ends. The first upper mounting part is located in one of the second openings and is slidably connected to the inner walls on both sides of the second opening. The second upper mounting part is located in the other second opening and is slidably connected to the inner walls on both sides of the second opening. The middle mounting plate has a first middle mounting part and a second middle mounting part at both ends. The first middle mounting part is located in one of the second openings and is slidably connected to the inner walls on both sides of the second opening. The second middle mounting part is located in the other second opening and is slidably connected to the inner walls on both sides of the second opening.

[0010] As a preferred technical solution, the hot pressing device further includes a second driving mechanism and a third driving mechanism. The second driving mechanism includes two upper and lower cylinders arranged opposite each other. One upper and lower cylinder is located at the top of the upper mounting plate and the first upper mounting part, and the end of the output shaft of the upper and lower cylinder passes through the first mounting plate through hole at the top of the upper mounting plate and the first upper mounting part and is connected to the top of the middle mounting plate. The other upper and lower cylinder is located at the top of the upper mounting plate and the second upper mounting part, and the end of the output shaft of the upper and lower cylinder passes through the second mounting plate through hole at the top of the upper mounting plate and the second upper mounting part and is connected to the top of the middle mounting plate. The upper heating plate and the first middle heating plate are located between the two upper and lower cylinders. The third driving mechanism includes two lifting cylinders arranged opposite each other. The two lifting cylinders are respectively located at the bottom of the two second openings, and the ends of the output shafts of the two lifting cylinders are respectively connected to the bottom of the middle mounting plate. The second middle heating plate and the lower heating plate are located between the two lifting cylinders.

[0011] As a preferred technical solution, a downward pressure sensor is provided at the bottom of the frame, and the lower mounting plate is disposed on top of the downward pressure sensor.

[0012] As a preferred technical solution, the bottom of the upper mounting plate is provided with an upper heat insulation plate, and the upper heating plate is disposed at the bottom of the upper heat insulation plate. The top and bottom of the middle mounting plate are respectively provided with a first middle heat insulation plate and a second middle heat insulation plate. The first middle heating plate is disposed at the top of the first middle heat insulation plate, and the second middle heating plate is disposed at the bottom of the second middle heat insulation plate. The top of the lower mounting plate is provided with a lower heat insulation plate, and the lower heating plate is disposed at the top of the lower heat insulation plate.

[0013] As a preferred technical solution, the upper heating plate is provided with upper insulation plates at both ends and both sides, the first middle heating plate is provided with first middle insulation plates at both ends and both sides, the second middle heating plate is provided with second middle insulation plates at both ends and both sides, and the lower heating plate is provided with lower insulation plates at both ends and both sides.

[0014] As a preferred technical solution, the middle layer drive assembly includes two middle layer cylinders arranged opposite to each other. The two middle layer cylinders are respectively disposed on the top of the middle layer mounting plate. The middle layer mounting block is located between the two middle layer cylinders. Two middle layer connecting plates are respectively provided at both ends of the middle layer mounting block. The two middle layer connecting plates and the ends of the output shafts of the two middle layer cylinders are respectively connected by two middle layer cylinder plates.

[0015] As a preferred technical solution, the lower drive assembly includes two lower cylinders arranged opposite to each other. The two lower cylinders are respectively disposed at both ends of the lower mounting plate. The output shafts of the two lower cylinders are respectively connected to two lower cylinder plates. The top of the two lower cylinder plates are respectively provided with two lower connecting plates. The two lower connecting plates are respectively disposed at the bottom of the lower mounting block.

[0016] As a preferred technical solution, the bottom of the upper heating block is provided with an upper buffer pad, the top of the first middle heating block is provided with a first middle buffer pad, the bottom of the second middle heating block is provided with a second middle buffer pad, and the top of the lower heating block is provided with a lower buffer pad.

[0017] The beneficial effects of this utility model are: while heating the battery cell, this utility model can also heat the two tabs of the battery cell. In this way, heat can penetrate into the interior of the battery cell from the upper and lower surfaces and be transferred to the interior of the battery cell through the two tabs. The heat transfer efficiency of the tabs is high, which accelerates the rise of the internal temperature of the battery cell compared with the prior art. It can reach the specified temperature in a shorter time, enabling the battery cell to be quickly shaped, shortening the hot pressing shaping time and improving the hot pressing shaping efficiency. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of a hot pressing device from a first angle according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of the hot pressing device from the second angle;

[0021] Figure 3 yes Figure 1 A schematic diagram of the frame of the hot press device is shown.

[0022] Figure 4 yes Figure 1 A schematic diagram of the upper hot pressing mechanism of the hot pressing device shown at the first angle;

[0023] Figure 5 yes Figure 1 A schematic diagram of the upper hot pressing mechanism of the hot pressing device shown at a second angle;

[0024] Figure 6 yes Figure 1 A schematic diagram of the first angle of the middle layer hot pressing mechanism of the hot pressing device shown;

[0025] Figure 7 yes Figure 1 A schematic diagram of the second angle of the middle layer hot pressing mechanism of the hot pressing device shown;

[0026] Figure 8 yes Figure 1 A schematic diagram of the lower hot pressing mechanism of the hot pressing device shown, after removing the lower mounting plate, at the first angle.

[0027] Figure 9 yes Figure 1 The diagram shows the structure of the lower hot pressing mechanism of the hot pressing device after removing the lower mounting plate at the second angle. Detailed Implementation

[0028] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0029] Please refer to Figures 1 to 3 An embodiment of the present invention provides a hot pressing device, including a frame 10, an upper hot pressing mechanism 20, a middle hot pressing mechanism 30, a lower hot pressing mechanism 40, a first driving mechanism 50, a second driving mechanism 60, and a third driving mechanism 70.

[0030] The frame 10 has two first openings 11 on each side and two second openings 12 at each end. The upper hot pressing mechanism 20, the middle hot pressing mechanism 30 and the lower hot pressing mechanism 40 are arranged sequentially from top to bottom.

[0031] Specifically, in combination Figures 4 to 9 As shown, the upper heat pressing mechanism 20 includes an upper mounting plate 21, an upper heating plate 22 disposed at the bottom of the upper mounting plate 21, and two upper heating blocks 24 disposed opposite to each other. The upper mounting plate 21 is disposed within the frame 10 and can move up and down relative to the frame 10. The two upper heating blocks 24 are respectively disposed at both ends of the bottom of the upper heating plate 22. The up and down movement of the upper mounting plate 21 can drive the upper heating plate 22 and the two upper heating blocks 24 to move up and down. The upper heating plate 22 and the upper heating blocks 24 generate heat after being energized.

[0032] The middle layer hot pressing mechanism 30 includes a middle layer mounting plate 31, a first middle layer heating plate 32a, a second middle layer heating plate 32b, two opposing first middle layer heating blocks 35, a middle layer mounting block 34, two opposing second middle layer heating blocks 36, and a middle layer drive assembly. The middle layer mounting plate 31 is disposed within the frame 10 and can move vertically relative to the frame 10. The first middle layer heating plate 32a is disposed on top of the middle layer mounting plate 31 and corresponds to the upper heating plate 22. The second middle layer heating plate 32b is disposed at the bottom of the middle layer mounting plate 31 and corresponds to the first middle layer heating plate 32a. A middle layer mounting groove is provided at the top center of the first middle layer heating plate 32a, and the length direction of the middle layer mounting groove is the same as the length direction of the first middle layer heating plate 32a. The middle layer mounting block 34 cooperates with the middle layer mounting groove, and the two ends of the middle layer mounting block 34 protrude from the two ends of the first middle layer heating plate 32a, respectively. Two first middle-layer heating blocks 35 are respectively disposed on the top of the middle-layer mounting block 34 and correspond to the two upper-layer heating blocks 24. A middle-layer drive assembly is used to drive the middle-layer mounting block 34 to move up and down, thereby driving the two first middle-layer heating blocks 35 to move up and down. Two second middle-layer heating blocks 36 are respectively disposed at both ends of the bottom of the second middle-layer heating plate 32b. The up and down movement of the middle-layer mounting plate 31 can drive the first middle-layer heating plate 32a, the second middle-layer heating plate 32b, the middle-layer mounting block 34, the two first middle-layer heating blocks 35, the middle-layer drive assembly, and the two second middle-layer heating blocks 36 to move up and down. The first middle-layer heating plate 32a, the second middle-layer heating plate 32b, the first middle-layer heating blocks 35, and the second middle-layer heating blocks 36 generate heat after being powered on. The heat generated by the first middle-layer heating plate 32a and the two first middle-layer heating blocks 35 can be transferred to the middle-layer mounting block 34.

[0033] In this embodiment, the upper mounting plate 21 has a first upper mounting portion 211a and a second upper mounting portion 211b formed at both ends. The first upper mounting portion 211a is located within one of the second openings 12 and is slidably connected to the inner walls on both sides of the second opening 12. The second upper mounting portion 211b is located within the other second opening 12 and is slidably connected to the inner walls on both sides of the second opening 12. The middle mounting plate 31 has a first middle mounting portion 311a and a second middle mounting portion 311b formed at both ends. The first middle mounting portion 311a is located within one of the second openings 12 and is slidably connected to the inner walls on both sides of the second opening 12. The second middle mounting portion 311b is located within the other second opening 12 and is slidably connected to the inner walls on both sides of the second opening 12.

[0034] Specifically, such as Figure 3As shown, one of the second openings 12 has two opposing first slide rails 81a on its inner walls on both sides. The first slide rails 81a are slidably fitted with a first upper slider 82a and a first lower slider 84a, with the upper slider 82a positioned above the lower slider 84a. The other second opening 12 has two opposing second slide rails 81b on its inner walls on both sides. The second slide rails 81b are slidably fitted with a second upper slider 82b and a second lower slider 84b, with the upper slider 82b positioned above the lower slider 84b. The bottom of the first upper mounting portion 211a has two first upper connecting blocks 83a, which are connected to the first upper sliders 82a of the two first slide rails 81a. The bottom of the second upper mounting portion 211b has two second upper connecting blocks 83b, which are connected to the second upper sliders 82b of the two second slide rails 81b. The bottom of the first middle layer mounting part 311a is provided with two first middle layer connecting blocks 85a, and the two first middle layer connecting blocks 85a are respectively connected to the first lower sliders 84a of the two first slide rails 81a. The bottom of the second middle layer mounting part 311b is provided with two second middle layer connecting blocks 85b, and the two second middle layer connecting blocks 85b are respectively connected to the second lower sliders 84b of the two second slide rails 81b.

[0035] In this embodiment, the middle layer drive assembly includes two middle layer cylinders 391 arranged opposite to each other. The two middle layer cylinders 391 are respectively disposed on the top of the middle layer mounting plate 31, and the middle layer mounting block 34 is located between the two middle layer cylinders 391. Two middle layer connecting plates 341 are respectively provided at both ends of the middle layer mounting block 34. The two middle layer connecting plates 341 and the ends of the output shafts of the two middle layer cylinders 391 are respectively connected by two middle layer cylinder plates 3911. The two middle layer cylinders 391 are used to drive the two middle layer connecting plates 341 to move up and down through the two middle layer cylinder plates 3911, thereby driving the middle layer mounting block 34 to move up and down.

[0036] The lower-layer hot-pressing mechanism 40 includes a lower-layer mounting plate 41, a lower-layer heating plate 42 disposed on top of the lower-layer mounting plate 41, two lower-layer heating blocks 45 disposed opposite to each other, a lower-layer mounting block 44, and a lower-layer drive assembly. The lower-layer mounting plate 41 is disposed at the bottom of the frame 10, and the lower-layer heating plate 42 corresponds to the second middle-layer heating plate 32b. A lower-layer mounting groove is provided at the top center of the lower-layer heating plate 42, and the length direction of the lower-layer mounting groove is the same as the length direction of the lower-layer heating plate 42. The lower-layer mounting block 44 cooperates with the lower-layer mounting groove, and the two ends of the lower-layer mounting block 44 protrude from the two ends of the lower-layer heating plate 42, respectively. The two lower-layer heating blocks 45 are respectively disposed on the top of the lower-layer mounting block 42 and correspond to the two second middle-layer heating blocks 36, respectively. The lower-layer drive assembly is used to drive the lower-layer mounting block 44 to move up and down, thereby driving the two lower-layer heating blocks 45 to move up and down. The lower-layer heating plate 42 and the lower-layer heating blocks 45 heat up after being powered on. The heat generated by the lower heating plate 42 and the heat generated by the two lower heating blocks 45 can be transferred to the lower mounting block 44.

[0037] In this embodiment, a pressure sensor 13 is provided at the bottom of the frame 10, and a lower mounting plate 41 is positioned on top of the pressure sensor 13. When the battery cell placed on the lower heating plate 42 is hot-pressed and shaped, the pressure applied to the battery cell can be detected by the pressure sensor 13.

[0038] In this embodiment, the lower drive assembly includes two lower cylinders 491 arranged opposite each other. The two lower cylinders 491 are respectively mounted at both ends of the lower mounting plate 41 via cylinder seats. The output shafts of the two lower cylinders 491 are respectively connected to two lower cylinder plates 4911. The tops of the two lower cylinder plates 4911 are respectively provided with two lower connecting plates 441, which are respectively disposed at the bottom of the lower mounting block 44. The two lower cylinders 491 are used to drive the two lower connecting plates 441 to move up and down via the two lower cylinder plates 4911, thereby driving the lower mounting block 44 to move up and down.

[0039] The upper mounting plate 21 has an upper heat insulation plate 23 at its bottom, and an upper heating plate 22 at its bottom. The middle mounting plate 31 has a first middle heat insulation plate 33 and a second middle heat insulation plate at its top and bottom, respectively. The first middle heating plate 32a is located at the top of the first middle heat insulation plate 33, and the second middle heating plate 32b is located at the bottom of the second middle heat insulation plate. The lower mounting plate 41 has a lower heat insulation plate 43 at its top, and a lower heating plate 42 is located at the top of the lower heat insulation plate 43. The upper heat insulation plate 23, the first middle heat insulation plate 33, the second middle heat insulation plate, and the lower heat insulation plate 43 all serve to insulate the upper mounting plate 21, the middle mounting plate 31, and the lower mounting plate 41, respectively. The vertical movement of the upper mounting plate 21 can cause the upper heat insulation plate 23 to move vertically. The up-and-down movement of the middle layer mounting plate 31 can drive the first middle layer insulation plate 33 and the second middle layer insulation plate to move up and down.

[0040] Upper heating plate 22 has upper insulation plates 221 at both ends and both sides. First middle heating plate 32a has first middle insulation plates 321a at both ends and both sides. Second middle heating plate 32b has second middle insulation plates 321b at both ends and both sides. Lower heating plate 42 has lower insulation plates 421 at both ends and both sides. The upper insulation plates 221, first middle insulation plates 321a, second middle insulation plates 321b, and lower insulation plates 421 serve to insulate the heating elements, ensuring the heating temperature of the battery cell. The vertical movement of the upper heating plate 22 causes the upper insulation plates 221 to move vertically. The vertical movement of the first middle heating plate 32a causes the first middle insulation plates 321a to move vertically, and the vertical movement of the second middle heating plate 32b causes the second middle insulation plates 321b to move vertically.

[0041] In this embodiment, as Figure 6 As shown, the first middle heating plate 32a includes a lower middle plate 323a and an upper middle plate 323b. The lower middle plate 323a is positioned on top of the first middle insulation plate 33, and the upper middle plate 323b is positioned on top of the lower middle plate 323a. The width of the upper middle plate 323b is smaller than the width of the lower middle plate 323a. A middle mounting groove is provided at the center of the top of the upper middle plate 323b. The first middle insulation plate 321a is provided at both ends and sides of the upper middle plate 323b and at both ends and sides of the lower middle plate 323a. There are two first middle insulation plates 321a at each end of the upper middle plate 323b, and the two first middle insulation plates 321a are located on both sides of the middle mounting block 34. Figure 8 and Figure 9As shown, the lower heating plate 42 includes a lower lower plate 42a and a lower upper plate 42b. The lower lower plate 42a is located on top of the lower insulation plate 43, and the lower upper plate 42b is located on top of the lower lower plate 42a. The width of the lower upper plate 42b is smaller than the width of the lower lower plate 42a. The lower mounting groove is provided at the center of the top of the lower upper plate 42b. The lower insulation plates 421 are provided at both ends and both sides of the lower lower plate 42a and the lower upper plate 42b, respectively. There are two lower insulation plates 421 at each end of the lower upper plate 42b, and the two lower insulation plates 421 are located on both sides of the lower mounting block 44.

[0042] The upper heating block 24 has an upper buffer pad 241 at its bottom, the first middle heating block 35 has a first middle buffer pad 351 at its top, the second middle heating block 36 has a second middle buffer pad 361 at its bottom, and the lower heating block 45 has a lower buffer pad 451 at its top. These buffer pads (241, 351, 361, and 451) serve a buffering function to prevent damage to the corresponding tabs of the battery cell. The upper buffer pad 241, 351, 361, and 451 are all made of materials such as rubber or silicone. The up-and-down movement of the upper heating block 24 causes the upper buffer pad 241 to move up and down. Similarly, the up-and-down movement of the first middle heating block 35 causes the first middle buffer pad 351 to move up and down, and the up-and-down movement of the second middle heating block 36 causes the second middle buffer pad 361 to move up and down.

[0043] The first drive mechanism 50 includes an electric cylinder 51. An upper pressure sensor 27 is provided on the top of the upper mounting plate 21. The electric cylinder 51 is located at the top of the frame 10, and the end of the output shaft of the electric cylinder 51 passes through a frame through-hole at the top of the frame 10 and connects to the upper pressure sensor 27. The electric cylinder 51 drives the upper mounting plate 21 to move up and down. Driven by two upper and lower cylinders 61, it drives the middle mounting plate 31 to move up and down. The downward movement of the upper mounting plate 21 and the middle mounting plate 31 apply downward pressure. When hot-pressing the battery cell placed on the first middle heating plate 32a, the pressure applied to the battery cell is detected by the upper pressure sensor 27. Based on the pressure detected by the upper pressure sensor 27 and the lower pressure sensor 13, the distance the upper mounting plate 21 moves downward driven by the electric cylinder 51 can be adjusted, thereby adjusting the downward pressure.

[0044] The second drive mechanism 60 includes two opposing upper and lower cylinders 61. One upper and lower cylinder 61 is located on the top of the upper mounting plate 21 and the first upper mounting part 211a, and the end of the output shaft of this upper and lower cylinder 61 passes through the first mounting plate through hole 212a at the top of the upper mounting plate 21 and the first upper mounting part 211a and connects to the top of the middle mounting plate 31. The other upper and lower cylinder 61 is located on the top of the upper mounting plate 21 and the second upper mounting part 211b, and the end of the output shaft of this upper and lower cylinder 61 passes through the second mounting plate through hole 212b at the top of the upper mounting plate 21 and the second upper mounting part 211b and connects to the top of the middle mounting plate 31. The upper heating plate 22 and the first middle heating plate 32a are located between the two upper and lower cylinders 61. The two upper and lower cylinders 61 are used to drive the upper mounting plate 21 to move up and down. In this embodiment, the top of the middle mounting plate 31 is provided with two first connectors 312, and the ends of the output shafts of the two upper and lower cylinders 61 are respectively connected to the two first connectors 312.

[0045] The third drive mechanism 70 includes two opposing lifting cylinders 71, which are respectively located at the bottom of the two second openings 12. The ends of the output shafts of the two lifting cylinders 71 are connected to the bottom of the middle layer mounting plate 31. The second middle layer heating plate 32b, the lower layer heating plate 42, the lower layer mounting plate 41, the raised plate 14, and the lower pressure sensor 13 are located between the two lifting cylinders 71. The two lifting cylinders 71 are used to drive the middle layer mounting plate 31 to move up and down. In this embodiment, the bottom of the middle layer mounting plate 31 is provided with two second connectors, and the ends of the output shafts of the two lifting cylinders 71 are respectively connected to the two second connectors.

[0046] In this embodiment, the bottom of the second opening 12 is provided with a groove 121, such as... Figure 3 As shown, two lifting cylinders 71 are respectively installed at the bottom of the grooves 121 of the two second openings 12.

[0047] With the above structure, in practical application, the first battery cell is placed on the lower heating plate 42 and the lower mounting block 44 through one of the first openings 11 of the frame 10, and the two tabs of the first battery cell are respectively located on the lower buffer pads 451 of the two lower heating blocks 45. The second battery cell is placed on the first middle heating plate 32a and the middle mounting block 34 through one of the first openings 11 of the frame 10, and the two tabs of the second battery cell are respectively located on the first middle buffer pads 351 of the two first middle heating blocks 35. Then, the middle layer mounting plate 31 is driven to move downward by two lifting cylinders 71, which in turn drives the first middle layer heating plate 32a, the middle layer mounting block 34, the two first middle layer heating blocks 35, the second middle layer heating plate 32b, the two second middle layer heating blocks 36, and the two middle layer cylinders 391 to move downward, so that the second middle layer heating plate 32b contacts the upper surface of the first cell. At the same time, the upper layer mounting plate 21 is driven to move downward by two upper and lower cylinders 61, which in turn drives the upper layer heating plate 22 and the two upper layer heating blocks 24 to move downward, so that the upper layer heating plate 22 contacts the upper surface of the second cell.Then, the upper mounting plate 21 is driven downward by the electric cylinder 51 to apply downward pressure. Under the action of the two upper and lower cylinders 61, the middle mounting plate 31 is also driven downward to apply downward pressure. Thus, the upper heating plate 22 can compress the second battery cell, and the second middle heating plate 32b can compress the first battery cell. At the same time as the electric cylinder 51 drives the upper mounting plate 21 to move downward, the two lower cylinders 491 drive the two lower heating blocks 45 to move upward, so that the two lower heating blocks 45 and the two second middle heating blocks can compress the first battery cell. 36 clamps the two tabs of the first battery cell, and drives the two first middle-layer heating blocks 35 to move upward through the two middle-layer heating blocks 391, so that the two first middle-layer heating blocks 35 and the two upper-layer heating blocks 24 clamp the two tabs of the second battery cell respectively. During this process, the second battery cell is heated by the upper-layer heating plate 22 and the first middle-layer heating plate 32a. The heat is transferred from the upper-layer heating plate 22, the first middle-layer heating plate 32a, and the middle-layer mounting block 34 to the upper and lower surfaces of the second battery cell respectively, and then penetrates into the interior of the second battery cell. The first battery cell is heated by the lower heating plate 42 and the second middle heating plate 32b. Heat is transferred from the lower heating plate 42, the lower mounting block 44, and the second middle heating plate 32b to the upper and lower surfaces of the first battery cell, respectively, and then penetrates into the interior of the first battery cell. The two lower heating blocks 45 and the two second middle heating blocks 36 heat the two tabs of the first battery cell, respectively. Heat is transferred from the lower buffer pads 451 of the two lower heating blocks 45 and the second buffer pads 361 of the two second middle heating blocks 36. The heat is transferred to the upper and lower surfaces of the two tabs of the first battery cell, and then to the interior of the first battery cell. The two tabs of the second battery cell are heated by the two first middle layer heating blocks 35 and the two upper layer heating blocks 24 respectively. The heat is transferred to the upper and lower surfaces of the two tabs of the second battery cell by the first middle layer buffer pads 351 of the two first middle layer heating blocks 35 and the upper layer buffer pads 24 of the two upper layer heating blocks 24 respectively, and then to the interior of the second battery cell. In this way, the first battery cell and the second battery cell are heat-pressed and shaped respectively.

[0048] This invention utilizes two upper heating blocks 24 in the upper heating mechanism 20 and two first middle heating blocks 35 in the middle heating mechanism 30 to heat and shape the battery cell placed on the first middle heating plate 32a. Simultaneously, while the upper heating plate 22 and the first middle heating plate 32a heat the battery cell, the two upper heating blocks 24 and the two first middle heating blocks 35 also heat the two tabs of the battery cell. Furthermore, the two lower heating blocks 45 in the lower heating mechanism 40 and the two second middle heating blocks 36 in the middle heating mechanism 30 heat the battery cell placed on the lower heating plate 42a. During the hot-pressing and shaping of the battery cell, while the lower heating plate 42 and the second middle heating plate 32b heat the cell, the two lower heating blocks 45 and the two second middle heating blocks 36 also heat the two tabs of the cell. This allows heat to penetrate from the upper and lower surfaces of the cell into its interior, and also to be transferred through the two tabs. The heat transfer through the tabs is highly efficient, accelerating the rise in the cell's internal temperature compared to existing technologies. It allows the cell to reach the designated temperature quickly, enabling rapid shaping, shortening the hot-pressing and shaping time, and improving efficiency. Furthermore, heating the two tabs ensures uniform heating within the cell, enhancing the reliability of the hot-pressing and shaping process. The middle layer driving component of the middle layer hot pressing mechanism 30 and the lower layer driving component of the lower layer hot pressing mechanism 40 drive two first middle layer heating blocks 35 upward through the middle layer driving component. This allows the two upper layer heating blocks 24 and the two first middle layer heating blocks 35 to clamp the two tabs of the battery cell placed on the first middle layer heating plate 32a, thus facilitating the heating of the two tabs of the battery cell. The lower layer driving component drives two lower layer heating blocks 45 upward through the lower layer heating blocks 45 and the two second middle layer heating blocks 36, thus clamping the two tabs of the battery cell placed on the lower layer heating plate 42, thus facilitating the heating of the two tabs of the battery cell.

[0049] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A hot pressing device, comprising a frame, an upper hot pressing mechanism, a middle hot pressing mechanism, and a lower hot pressing mechanism, wherein the frame has two first openings on each side; the upper, middle, and lower hot pressing mechanisms are arranged sequentially from top to bottom; the upper hot pressing mechanism includes an upper mounting plate and an upper heating plate disposed at the bottom of the upper mounting plate; the upper mounting plate is disposed within the frame and is movable vertically relative to the frame; the middle hot pressing mechanism includes a middle mounting plate, a first middle heating plate disposed at the top of the middle mounting plate, and a second middle heating plate disposed at the bottom of the middle mounting plate; the middle mounting plate is disposed within the frame and is movable vertically relative to the frame; the first middle heating plate corresponds to the upper heating plate, and the second middle heating plate corresponds to the first middle heating plate; the lower hot pressing mechanism includes a lower mounting plate and a lower heating plate disposed at the top of the lower mounting plate; the lower mounting plate is disposed at the bottom of the frame; and the lower heating plate corresponds to the second middle heating plate. The upper-layer hot-pressing mechanism further includes two upper-layer heating blocks arranged opposite each other, with the two upper-layer heating blocks respectively disposed at both ends of the bottom of the upper-layer heating plate. The middle-layer hot-pressing mechanism further includes two first middle-layer heating blocks arranged opposite each other, a middle-layer mounting block, two second middle-layer heating blocks arranged opposite each other, and a middle-layer driving assembly. The top of the first middle-layer heating plate is provided with a middle-layer mounting groove, and the middle-layer mounting block cooperates with the middle-layer mounting groove. The two ends of the middle-layer mounting block protrude from the two ends of the first middle-layer heating plate. The two first middle-layer heating blocks are respectively disposed on the top of the middle-layer mounting block and correspond to the two upper-layer heating blocks respectively. The middle layer drive assembly is used to drive the middle layer mounting block to move up and down. The two second middle layer heating blocks are respectively disposed at both ends of the bottom of the second middle layer heating plate. The lower layer hot pressing mechanism also includes two lower layer heating blocks, a lower layer mounting block and a lower layer drive assembly arranged opposite each other. The top of the lower layer heating plate is provided with a lower layer mounting groove. The lower layer mounting block cooperates with the lower layer mounting groove, and the two ends of the lower layer mounting block protrude from the two ends of the lower layer heating plate. The two lower layer heating blocks are respectively disposed on the top of the lower layer mounting block and correspond to the two second middle layer heating blocks respectively. The lower layer drive assembly is used to drive the lower layer mounting block to move up and down.

2. The hot pressing device according to claim 1, characterized in that, The hot pressing device further includes a first driving mechanism, which includes an electric cylinder. An upper pressure sensor is provided on the top of the upper mounting plate. The electric cylinder is located at the top of the frame, and the end of the output shaft of the electric cylinder passes through the frame through hole at the top of the frame and is connected to the upper pressure sensor.

3. The hot pressing device according to claim 1, characterized in that, The frame has two second openings at both ends. The upper mounting plate has a first upper mounting part and a second upper mounting part at both ends. The first upper mounting part is located in one of the second openings and is slidably connected to the inner walls on both sides of the second opening. The second upper mounting part is located in the other second opening and is slidably connected to the inner walls on both sides of the second opening. The middle mounting plate has a first middle mounting part and a second middle mounting part at both ends. The first middle mounting part is located in one of the second openings and is slidably connected to the inner walls on both sides of the second opening. The second middle mounting part is located in the other second opening and is slidably connected to the inner walls on both sides of the second opening.

4. The hot pressing device according to claim 3, characterized in that, The hot pressing device further includes a second driving mechanism and a third driving mechanism. The second driving mechanism includes two upper and lower cylinders arranged opposite each other. One upper and lower cylinder is located at the top of the upper mounting plate and the first upper mounting part, and the end of the output shaft of the upper and lower cylinder passes through the first mounting plate through hole at the top of the upper mounting plate and the first upper mounting part and is connected to the top of the middle mounting plate. The other upper and lower cylinder is located at the top of the upper mounting plate and the second upper mounting part, and the end of the output shaft of the upper and lower cylinder passes through the second mounting plate through hole at the top of the upper mounting plate and the second upper mounting part and is connected to the top of the middle mounting plate. The upper heating plate and the first middle heating plate are located between the two upper and lower cylinders. The third driving mechanism includes two lifting cylinders arranged opposite each other. The two lifting cylinders are respectively located at the bottom of the two second openings, and the ends of the output shafts of the two lifting cylinders are respectively connected to the bottom of the middle mounting plate. The second middle heating plate and the lower heating plate are located between the two lifting cylinders.

5. The hot pressing device according to claim 2, characterized in that, A pressure sensor is located at the bottom of the frame, and the lower mounting plate is located on top of the pressure sensor.

6. The hot pressing device according to claim 1, characterized in that, The upper mounting plate has an upper heat insulation plate at its bottom, and the upper heating plate is located at the bottom of the upper heat insulation plate. The middle mounting plate has a first middle heat insulation plate and a second middle heat insulation plate at its top and bottom, respectively. The first middle heating plate is located at the top of the first middle heat insulation plate, and the second middle heating plate is located at the bottom of the second middle heat insulation plate. The lower mounting plate has a lower heat insulation plate at its top, and the lower heating plate is located at the top of the lower heat insulation plate.

7. The hot pressing device according to claim 1, characterized in that, The upper heating plate has upper insulation boards at both ends and both sides, the first middle heating plate has first middle insulation boards at both ends and both sides, the second middle heating plate has second middle insulation boards at both ends and both sides, and the lower heating plate has lower insulation boards at both ends and both sides.

8. The hot pressing device according to claim 1, characterized in that, The middle layer drive assembly includes two middle layer cylinders arranged opposite each other. The two middle layer cylinders are respectively disposed on the top of the middle layer mounting plate. The middle layer mounting block is located between the two middle layer cylinders. Two middle layer connecting plates are respectively provided at both ends of the middle layer mounting block. The two middle layer connecting plates and the ends of the output shafts of the two middle layer cylinders are respectively connected by two middle layer cylinder plates.

9. The hot pressing device according to claim 1, characterized in that, The lower drive assembly includes two lower cylinders arranged opposite each other. The two lower cylinders are respectively located at both ends of the lower mounting plate. The output shafts of the two lower cylinders are respectively connected to two lower cylinder plates. The top of the two lower cylinder plates is provided with two lower connecting plates. The two lower connecting plates are respectively located at the bottom of the lower mounting block.

10. The hot pressing device according to claim 1, characterized in that, The upper heating block has an upper buffer pad at its bottom, the first middle heating block has a first middle buffer pad at its top, the second middle heating block has a second middle buffer pad at its bottom, and the lower heating block has a lower buffer pad at its top.

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