A double-layer multi-station hot press for lithium battery cells

Abstract

The present invention discloses a double-layer multi-station hot pressing machine for lithium battery cells, which relates to the field of hot pressing processing of lithium batteries. It comprises a frame, a bracket installed on the frame, and also comprises a booster assembly, a first upper hot pressing assembly, a first lower hot pressing assembly for placing the battery cell, a second upper hot pressing assembly and a second lower hot pressing assembly for placing the battery cell, which are installed on the bracket in sequence from top to bottom; the bottoms of the first upper hot pressing assembly and the second upper hot pressing assembly are both provided with a first hot pressing plate, the contact surface of the first hot pressing plate and the battery cell is provided with a ceramic coating, and the ceramic coating is provided with a plurality of small holes for blowing air; the first upper hot pressing assembly, the first lower hot pressing assembly and the second upper hot pressing assembly all move in the vertical direction. The present invention has the advantages of large downward pressure, not easy to stick, good battery cell hot pressing forming effect, accurate controllability, stable performance, good production quality, etc., and can effectively improve the battery cell hot pressing quality and hot pressing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery hot pressing processing, and in particular to a double-layer multi-station hot pressing machine for lithium battery cells. Background Art

[0002] In the production of lithium batteries, after winding or lamination, since the pole pieces and diaphragm paper structures inside the power lithium battery are relatively loose, the power lithium battery generally needs to be hot-pressed and shaped to ensure that the internal structure of the power lithium battery is strong and firm. However, in existing conventional technologies, the battery cells are easily stuck to the pressing plate during the pressing process, and the battery cells need to be manually removed from the pressing plate, which not only reduces the production efficiency of the battery cells, but also easily causes problems such as battery cell deformation and uneven thickness, affecting the quality of the battery cells. In addition, when facing mass production, some hot pressing mechanisms have a limited number of battery cells that can be hot-pressed each time, resulting in low efficiency. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a double-layer multi-station hot press for lithium battery cells, which has the advantages of large downward pressure, not easy to stick, good hot pressing effect of the cell, accurate controllable, stable performance, and good production quality, and can effectively improve the hot pressing quality and efficiency of the cell.

[0004] To achieve the above-mentioned objectives, the present invention provides a double-layer multi-station hot press for lithium battery cells, comprising a bracket, and also comprising a booster assembly, a first upper hot press assembly transmission-connected to the booster assembly, a first lower hot press assembly for placing battery cells, a second upper hot press assembly, and a second lower hot press assembly for placing battery cells, which are sequentially installed on the bracket from top to bottom; a first hot press plate is provided at the bottom of the first upper hot press assembly and the second upper hot press assembly, a ceramic coating is provided on the contact surface between the first hot press plate and the battery cell, and a plurality of small holes for blowing are provided on the ceramic coating; the first upper hot press assembly, the first lower hot press assembly, and the second upper hot press assembly all move in a vertical direction.

[0005] When using this technical solution, first place the battery cells on the first lower hot pressing assembly and the second lower hot pressing assembly. After pressing the start button, the third drive device drives the third mounting plate to move, so that the battery cells on the hot pressing carrier return to the bottom of the first upper hot pressing assembly / the second upper hot pressing assembly. Then the first drive device drives the first lower hot pressing assembly and the second upper hot pressing assembly to descend. This is mainly used to eliminate the gravity of the middle module to avoid different pressures of the upper and lower layers of battery cells during hot pressing. Then the booster assembly drives the first upper hot pressing assembly to descend and hot press the upper and lower layers of battery cells at the same time. During hot pressing, the fourth drive device drives the resistance testing device to perform resistance testing on the battery cells. After the hot pressing is completed, when the action is retracted, the small holes on the ceramic coating blow air out to prevent the battery cells from sticking.

[0006] In the above technical solution, the boosting assembly includes a first fixed plate installed on the top of the bracket, and a boosting cylinder fixed on the first fixed plate, and the first upper hot pressing assembly is transmission-connected to the boosting cylinder.

[0007] The above technical solution also includes a first mounting plate, a second fixed plate arranged horizontally on the first mounting plate, a second mounting plate and a third fixed plate arranged horizontally on the second mounting plate, the bracket is provided with a first slide rail arranged vertically, the first mounting plate and the second mounting plate are respectively fixed on a first slider cooperating with the first slide rail, the first upper hot pressing assembly is installed at the bottom of the second fixed plate, the first lower hot pressing assembly is installed at the top of the third fixed plate, and the second upper hot pressing assembly is installed at the bottom of the third fixed plate. This embodiment has a compact structure and can improve the hot pressing efficiency of the battery cell.

[0008] The above technical solution further includes a first driving device arranged on the frame, and the first driving device drives the third fixing plate to move up and down in the vertical direction.

[0009] In the above technical solution, the first upper hot pressing assembly / second upper hot pressing assembly includes a pressure sensor arranged at the bottom of the second fixed plate / third fixed plate, a first thermal insulation plate arranged at the bottom of the pressure sensor, and a first heating plate arranged at the bottom of the first thermal insulation plate, and the first hot pressing plate is installed at the bottom of the first heating plate.

[0010] In the above technical solution, the first upper hot pressing assembly / second upper hot pressing assembly also includes a resistance testing device arranged on one side of the second fixed plate / third fixed plate and used to detect the resistance of the battery cells on the first lower hot pressing assembly / second lower hot pressing assembly, which is convenient for detecting the resistance of the battery cells during the hot pressing process of the battery cells and improving the quality of the hot pressing of the battery cells.

[0011] In the above technical solution, the first upper hot pressing assembly / second upper hot pressing assembly also includes a fourth driving device arranged on one side of the second fixed plate / third fixed plate and an insulating plate that is transmission-connected to the fourth driving device. The fourth driving device drives the insulating plate to move in the vertical direction, and the resistance testing device is installed on the insulating plate.

[0012] The above technical solution also includes a fourth fixed plate installed on the bracket and used to install the second lower hot pressing assembly. The first lower hot pressing assembly / second lower hot pressing assembly includes a second slide rail installed on the third fixed plate / fourth fixed plate, a second slider sliding on the second slide rail, a third mounting plate fixedly connected to the second slider, a second heat insulation plate installed on the top of the third mounting plate in sequence, a second heating plate, a second hot pressing plate, a hot pressing carrier, and a third driving device. The hot pressing carrier is provided with a fixed groove adapted to the shape of the battery cell, and the third driving device drives the third mounting plate to move laterally on the second slide rail.

[0013] The above technical solution also includes a second sensor installed on the third fixing plate and the fourth fixing plate and used to detect whether the battery cell in the fixing slot has moved into place and is located below the first hot pressing plate. The third mounting plate is provided with a sensing block.

[0014] The above technical solution further includes a first sensor installed on the third mounting plate and used to detect whether there is a battery cell in the first fixing groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When using the present technical solution, first place the battery cells on the first lower hot pressing assembly and the second lower hot pressing assembly respectively. After pressing the start button, the third driving device on the first lower hot pressing assembly / the second lower hot pressing assembly respectively drives the battery cells on the hot pressing carrier to move to the bottom of the first upper hot pressing assembly / the second upper hot pressing assembly. Then the first driving device drives the first lower hot pressing assembly and the second upper hot pressing assembly to descend. At this time, it is mainly used to eliminate the gravity of the middle module, that is, to eliminate the gravity of the first lower hot pressing assembly and the second upper hot pressing assembly. Then the booster assembly drives the first upper hot pressing assembly to descend, and hot presses the upper and lower layers of battery cells at the same time. During hot pressing, the fourth driving device drives the resistance testing device to perform resistance testing on the battery cells. After the hot pressing is completed, when the action is retracted, the small holes on the ceramic coating blow air out to prevent the battery cells from sticking.

[0017] 2. The booster assembly of this embodiment can provide stable pressure to the first upper hot-pressing assembly and the second upper hot-pressing assembly, thereby improving the stability of the hot-pressing of the battery cells in this embodiment, greatly improving the hot-pressing quality and efficiency of the battery cells, and reducing production costs;

[0018] 3. The bottom of the first upper hot pressing assembly and the second upper hot pressing assembly of the present technical solution are both provided with a first hot pressing plate. A ceramic coating is provided on the contact surface between the first hot pressing plate and the battery cell. A plurality of small holes are provided on the ceramic coating. This can effectively solve the problem that the hot melt tape on the battery cell is easily stuck after hot pressing on the first hot pressing plate, can have a very good anti-sticking effect, and can also effectively extend the service life of the first hot pressing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural schematic diagram of a double-layer multi-station hot press for lithium battery cells provided by the present invention;

[0021] Figure 2 This is a structural schematic diagram of a double-layer multi-station hot press for lithium battery cells provided by the present invention from another angle;

[0022] Figure 3 It is a schematic diagram of the structure after removing the C-shaped plate;

[0023] Figure 4 2 is a schematic structural diagram of the first upper hot pressing assembly / the second upper hot pressing assembly;

[0024] Figure 5 2 is a schematic structural diagram of the first lower hot pressing assembly / the second lower hot pressing assembly;

[0025] Figure 6 2 is a schematic structural diagram of the first lower hot pressing assembly / the second lower hot pressing assembly at another angle;

[0026] Figure 7 It is a structural schematic diagram of the first lower hot pressing assembly and the second upper hot pressing assembly.

[0027] The markings in the accompanying drawings are: 1. rack; 2. bracket; 21. first slide rail; 22. first slider; 23. C-shaped plate; 24. rear vertical plate; 3. booster assembly; 31. first fixed plate; 32. booster cylinder; 4. first upper hot pressing assembly; 41. first hot pressing plate; 42. ceramic coating; 421. small hole; 43. pressure sensor; 44. first insulation plate; 45. first heating plate; 46. fourth driving device; 47. insulating plate; 5. first lower hot pressing assembly; 52. second slide rail; 53. second slider; 54. third installation Mounting plate; 541, sensing block; 55, second heat insulation plate; 56, second heating plate; 57, second hot pressing plate; 58, hot pressing carrier; 581, fixing groove; 59, third driving device; 6, second upper hot pressing assembly; 7, second lower hot pressing assembly; 71, fourth fixing plate; 8, first mounting plate; 9, second fixing plate; 10, second mounting plate; 11, third fixing plate; 13, first driving device; 14, resistance testing device; 15, second sensor; 16, third sensor; 17, first sensor; 18, protective block. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] like Figure 1-Figure 7As shown, this embodiment provides a double-layer multi-station hot press for lithium battery cells, which includes a bracket 2, and also includes a booster assembly 3, a first upper hot press assembly 4, a first lower hot press assembly 5 for placing the battery cells, a second upper hot press assembly 6, and a second lower hot press assembly 7 for placing the battery cells, which are installed on the bracket 2 in order from top to bottom. As a preference, this embodiment preferably provides a frame 1, wherein the bracket 2 is installed on the frame 1. Among them, the bracket 2 of this embodiment includes two vertically arranged C-shaped plates 23, and a rear vertical plate 24 arranged between the two C-shaped plates 23 and fixedly connected to the rear ends of the two C-shaped plates 23. The bottoms of the first upper hot press assembly 4 and the second upper hot press assembly 6 are both provided with a first hot press plate 41. The contact surface of the first hot press plate 41 with the battery cells is provided with a ceramic coating 42, and the ceramic coating 42 is provided with a plurality of small holes 421 for blowing air. The first upper hot press assembly 4, the first lower hot press assembly 5, and the second upper hot press assembly 6 all move in the vertical direction. Preferably, a number of tiny pores of 0.3 to 0.5 mm are provided on the ceramic coating 42. Compared with the structure in the past in which the first hot pressing plate 41 and the battery cell are coated with an iron ferron coating or only a ceramic coating 42 is used between the first hot pressing plate 41 and the battery cell, this can effectively solve the problem that the hot melt tape on the battery cell is easily stuck after the first hot pressing plate 41 is hot pressed, and can effectively extend the service life of the first hot pressing plate 41.

[0033] The boosting assembly 3 of this embodiment includes a first fixing plate 31 installed between the two C-shaped plates 23 and located on the top of the two C-shaped plates 23 , and a boosting cylinder 32 fixed on the first fixing plate 31 .

[0034] See also Figure 3 This embodiment also preferably includes a first mounting plate 8, a second fixing plate 9 disposed horizontally on the first mounting plate 8, a second mounting plate 10, and a third fixing plate 11 disposed horizontally on the second mounting plate 10. A first vertically arranged slide rail 21 is disposed on the rear vertical plate 24. The first mounting plate 8 and the second mounting plate 10 are respectively fixed to first sliders 22 that cooperate with the first slide rail 21. The first upper hot pressing assembly 4 is mounted on the bottom of the second fixing plate 9. Figure 7 The first lower hot pressing assembly 5 is mounted on the top of the third fixed plate 11, and the second upper hot pressing assembly 6 is mounted on the bottom of the third fixed plate 11. In this way, the present embodiment can be made more compact, so that the first lower hot pressing assembly 5 and the second upper hot pressing assembly 6 can move simultaneously. The present embodiment also preferably includes a first driving device 13 disposed on the frame 1, wherein the first driving device 13 can be a lifting cylinder, a screw rod, etc. The first driving device 13 is mainly used to drive the third fixed plate 11 to move in the vertical direction.

[0035] Specifically, the boost cylinder 32 applies pressure to the second fixed plate 9 in the vertical direction, thereby causing the first upper hot pressing assembly 4 to move in the vertical direction. After the hot pressing is completed, the boost cylinder 32 drives the first upper hot pressing assembly 4 to rise and reset, so that the first upper hot pressing assembly 4 leaves the top of the first lower hot pressing assembly 5, making it easier to remove the battery cell from the first lower hot pressing assembly 5. The first drive device 13 is transmission-connected to the third fixed plate 11, and is mainly used to eliminate the gravity and action reset effect of the intermediate module during the hot pressing process. The first drive device 13 can drive the first lower hot pressing assembly 5 and the second upper hot pressing assembly 6 to rise and reset, so that the second upper hot pressing assembly 6 leaves the top of the second lower hot pressing assembly 7, making it easier to remove the battery cell from the second lower hot pressing assembly 7. The first slider 22 and the first slide rail 21 of this embodiment can improve the vertical movement accuracy of the first upper hot pressing assembly 4, the first lower hot pressing assembly 5 and the second upper hot pressing assembly 6, thereby improving the accuracy of hot pressing of the battery cells when the first upper hot pressing assembly 4, the first lower hot pressing assembly 5 and the second upper hot pressing assembly 6 are pressed down, and improving the stability of the battery cells after hot pressing.

[0036] See also Figure 4 The first upper hot pressing assembly 4 / the second upper hot pressing assembly 6 includes a pressure sensor 43 arranged at the bottom of the second fixed plate 9 / the third fixed plate 11, a first heat insulation plate 44 arranged at the bottom of the pressure sensor 43, and a first heating plate 45 arranged at the bottom of the first heat insulation plate 44. The first hot pressing plate 41 is installed at the bottom of the first heating plate 45.

[0037] Specifically, the booster cylinder 32 drives the second fixed plate 9 to press downward, thereby driving the first upper hot-pressing assembly 4 to press downward. At this time, the pressure sensor 43 of the first upper hot-pressing assembly 4 can sense the magnitude of the pressure and transmit the sensed pressure magnitude signal to the booster cylinder 32, thereby controlling the pressure applied by the booster cylinder 32 to the second fixed plate 9, and further controlling the downward pressure of the first upper hot-pressing assembly 4. When the first upper hot-pressing assembly 4 is pressed down onto the first lower hot-pressing assembly 5, it will apply pressure to the third fixed plate 11. At this time, the pressure sensor 43 of the second upper hot-pressing assembly 6 can sense the magnitude of the pressure and transmit the sensed pressure magnitude signal to the booster cylinder 32, thereby controlling the pressure applied by the booster cylinder 32 to the second fixed plate 9, and further controlling the pressure applied by the second fixed plate 9 to the third fixed plate 11. Next, the first heat shield 44 is placed at the bottom of the pressure sensor 43, and the first heating plate 45 is placed at the bottom of the first heat shield 44. This will isolate the pressure sensor 43 from the first heating plate 45, preventing heat from being transferred to the pressure sensor 43 and damaging it. Next, the first hot pressing plate 41 is installed at the bottom of the first heating plate 45, so that the first hot pressing plate 41 can heat the battery cells. The ceramic coating 42 is placed at the bottom of the first hot pressing plate 41, which greatly facilitates the hot pressing work of the first hot pressing plate 41.

[0038] This embodiment is also preferably provided with a resistance testing device 14, which is mainly used to detect the resistance of the battery cells on the first lower hot pressing assembly 5 / the second lower hot pressing assembly 7. Preferably, the first upper hot pressing assembly 4 / the second upper hot pressing assembly 6 also includes a fourth driving device 46 and an insulating plate 47. The fourth driving device 46 is installed on one side of the second fixed plate 9 / the third fixed plate 11, and the insulating plate 47 is transmission-connected to the fourth driving device 46. The resistance testing device 14 is installed at the bottom of the insulating plate 47. The fourth driving device 46 drives the insulating plate 47 to move in the vertical direction, thereby driving the resistance testing device 14 to move in the vertical direction. Among them, the insulating plate 47 is preferably a glass fiber insulating plate 47. The insulating plate 47 can prevent the current on the resistance testing device 14 from being connected to other devices of this embodiment while the resistance testing device 14 is testing the resistance, causing a short circuit or electric shock.

[0039] This embodiment also includes a fourth fixed plate 71 mounted on the bracket 2, and the fourth fixed plate 71 is mainly used to mount the second lower hot pressing assembly 7. The first lower hot pressing assembly 5 / the second lower hot pressing assembly 7 includes a second slide rail 52, a second slider 53, a third mounting plate 54, a second heat insulation plate 55, a second heating plate 56, a second hot pressing plate 57, a hot pressing carrier 58, and a third driving device 59 mounted on the third fixed plate 11 / the fourth fixed plate 71. The second slider 53 slides on the second slide rail 52. The third mounting plate 54 is fixedly connected to the second slider 53 so that it can move horizontally as the second slider 53 slides. The second heat insulation plate 55, the second heating plate 56, the second hot pressing plate 57, and the hot pressing carrier 58 are sequentially mounted on the top of the third mounting plate 54. The third driving device 59 is mounted on the third fixed plate 11 / the fourth fixed plate 71 and is mainly used to drive the third mounting plate 54 to move laterally on the second slide rail 52. The hot pressing carrier 58 is provided with a fixing groove 581 adapted to the shape of the battery cell. Preferably, the number of hot pressing carriers 58 on the first lower hot pressing assembly 5 / the second lower hot pressing assembly 7 is two, so that this embodiment can press four battery cells at a time through the first upper hot pressing assembly 4, the first lower hot pressing assembly 5, the second upper hot pressing assembly 6, and the second lower hot pressing assembly 7, which can greatly improve the production efficiency of the battery cells.

[0040] Specifically, the battery cells are placed in the hot pressing carrier 58 on the first lower hot pressing assembly 5 / the second lower hot pressing assembly 7. The hot pressing carrier 58 is provided with a fixing groove 581 to facilitate the fixing and placement of the battery cells. The second slider 53, the second slide rail 52 and the third driving device 59 can drive the third mounting plate 54 to move in the horizontal direction, thereby driving the second heat insulation plate 55, the second heating plate 56, the second hot pressing plate 57 and the hot pressing carrier 58 to move in the horizontal direction, and then the fixing groove 581 on the hot pressing carrier 58 can be away from the first hot pressing plate 41 at the bottom of the first upper hot pressing assembly 4 / the second upper hot pressing assembly 6, thereby avoiding equipment obstruction or operational error during the loading and unloading process of the operator, causing the first upper hot pressing assembly 4 / the second upper hot pressing assembly 6 to be pressed down, causing burns to the personnel, thereby improving the safety of this embodiment. Among them, the third driving device 59 can be a cylinder, a screw rod, etc. In this embodiment, a pen-shaped cylinder is preferably used, which has a compact structure, a light weight, and is easy to install on the third fixing plate 11 / the fourth fixing plate 71. Next, after placing the battery cell in the fixed groove 581 and driving the third mounting plate 54 to move and move into position on the second slide rail 52, since the tabs of the battery cell do not need to be hot-pressed, the tabs will be located on the outside of the fixed groove 581. At this time, the resistance testing device 14 installed on one side of the second fixing plate 9 / third fixing plate 11 will be located above the tabs. When the first upper hot pressing assembly 4 / second upper hot pressing assembly 6 presses down on the first lower hot pressing assembly 5 / second lower hot pressing assembly 7, the resistance testing device 14 will also press down and touch the tabs of the battery cell, thereby detecting the resistance of the tabs of the battery cell. If the resistance testing device 14 cannot touch the tabs of the battery cell, the fourth driving device 46 drives the insulating plate 47 to move in the vertical direction, thereby driving the resistance testing device 14 to move in the vertical direction, so that the resistance testing device 14 can detect the resistance of the battery cell tabs. The resistance testing device 14 is provided with two probes, one probe corresponding to one battery cell tab. During the test, the two probes are in contact with the two tabs of the battery cell respectively. When the resistance testing device 14 detects that the battery cell resistance does not meet the requirements, the resistance testing device 14 will transmit a signal to the external alarm, and the alarm will sound an alarm. In this way, the battery cell resistance can be detected during the hot pressing process, which can effectively improve the hot pressing quality of the battery cell. This embodiment also preferably includes a first sensor 17 installed on the third mounting plate 54. The first sensor 17 is mainly used to detect whether there is a battery cell in the fixing groove 581 to avoid the occurrence of empty pressure.

[0041] This embodiment further includes a second sensor 15 mounted on the third fixing plate 11 and the fourth fixing plate 71 and configured to detect whether the battery cells within the fixing slots 581 have been moved into position and positioned below the first hot press plate 41. A sensing block 541 is provided on the third mounting plate 54. As the third mounting plate 54 moves on the second slide rail 52, it drives the battery cells to move. When the battery cells are positioned and just below the first hot press plate 41, the sensing blocks 541 on the third mounting plate 54 also move with the third mounting plate 54. The second sensor 15 senses the sensing blocks 541, and the first hot press plate 41 presses down to heat press the battery cells. Furthermore, this embodiment preferably includes a third sensor 16. When the third mounting plate 54 drives the battery cells to move and leaves the area below the first hot press plate 41, the third sensor 16 senses the sensing blocks 541 on the third mounting plate 54. At this point, the third drive device 59 ceases to drive the third mounting plate 54. The second sensor 15 and the third sensor 16 provided in this embodiment can facilitate the third mounting plate 54 to move between the second sensor 15 and the third sensor 16 .

[0042] In summary, the working principle of the present technical solution is as follows: first, the battery cells are placed on the first lower hot pressing assembly 5 and the second lower hot pressing assembly 7 respectively. After pressing the start button, the third driving device 59 on the first lower hot pressing assembly 5 / the second lower hot pressing assembly 7 will respectively drive the battery cells on the hot pressing carrier 58 to move to the bottom of the first upper hot pressing assembly 4 / the second upper hot pressing assembly 6. Then, the first driving device 13 drives the first lower hot pressing assembly 5 and the second upper hot pressing assembly 6 to descend. At this time, it is mainly used to eliminate the gravity of the middle module. This is to ensure that the pressure on the upper and lower layers of the battery cells is consistent. Then, the booster cylinder 32 Press down to drive the first upper hot pressing assembly to descend, and hot press the upper and lower layers of battery cells at the same time. During hot pressing, the fourth driving device 46 drives the resistance testing device 14 to test the resistance of the battery cells. If the resistance of the battery cells is unqualified, an alarm will be issued. Then after the hot pressing is completed, the booster cylinder 32 and the first driving device 13 drive the first upper hot pressing assembly 4, the first lower hot pressing assembly 5 and the second upper hot pressing assembly 6 to rise and reset. When the action is reset, the small holes 421 on the ceramic coating 42 on the first upper hot pressing assembly 4 and the second upper hot pressing assembly 6 will blow air out to prevent the battery cells from sticking. The pressure is adjusted by a precision pressure regulating valve.

[0043] This embodiment also preferably includes a protective block 18 arranged on the frame 1. When the first upper hot pressing assembly 4 and the first lower hot pressing assembly 5 or the second upper hot pressing assembly 6 and the second lower hot pressing assembly 7 need to be repaired or aligned, the protective block 18 is placed on the second hot pressing plate 57 to prevent the equipment from accidentally pressing and injuring people.

[0044] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A double-layer multi-station hot press for lithium battery cells, comprising a frame (1), a bracket (2) mounted on the frame (1), characterized in that: The apparatus further comprises a booster assembly (3) mounted on the bracket (2) from top to bottom, a first upper hot pressing assembly (4) connected to the booster assembly (3), a first lower hot pressing assembly (5) for placing the battery cell, a second upper hot pressing assembly (6) and a second lower hot pressing assembly (7) for placing the battery cell; the bottoms of the first upper hot pressing assembly (4) and the second upper hot pressing assembly (6) are both provided with a first hot pressing plate (41), a ceramic coating (42) is provided on the contact surface between the first hot pressing plate (41) and the battery cell, and a plurality of small holes (421) for blowing air are provided on the ceramic coating (42); the first upper hot pressing assembly (4), the first lower hot pressing assembly (5) and the second upper hot pressing assembly (6) all move in the vertical direction; It also includes a first mounting plate (8), a second fixed plate (9) arranged horizontally on the first mounting plate (8), a second mounting plate (10), and a third fixed plate (11) arranged horizontally on the second mounting plate (10), the bracket (2) is provided with a first slide rail (21) arranged vertically, the first mounting plate (8) and the second mounting plate (10) are respectively fixed on a first slider (22) matched with the first slide rail (21), the first upper hot pressing assembly (4) is installed at the bottom of the second fixed plate (9), the first lower hot pressing assembly (5) is installed at the top of the third fixed plate (11), and the second upper hot pressing assembly (6) is installed at the bottom of the third fixed plate (11); It also includes a first driving device (13) arranged on the frame (1), wherein the first driving device (13) drives the third fixing plate (11) to perform lifting movement in the vertical direction; The first upper hot pressing assembly (4) / the second upper hot pressing assembly (6) comprises a pressure sensor (43) arranged at the bottom of the second fixing plate (9) / the third fixing plate (11), a first heat insulating plate (44) arranged at the bottom of the pressure sensor (43), and a first heating plate (45) arranged at the bottom of the first heat insulating plate (44); the first hot pressing plate (41) is installed at the bottom of the first heating plate (45); It also includes a fourth fixed plate (71) installed on the bracket (2) and used to install the second lower hot pressing assembly (7), the first lower hot pressing assembly (5) / the second lower hot pressing assembly (7) includes a second slide rail (52) installed on the third fixed plate (11) / the fourth fixed plate (71), a second slider (53) sliding on the second slide rail (52), a third mounting plate (54) fixedly connected to the second slider (53), a second heat insulation plate (55) installed on the top of the third mounting plate (54) in sequence, a second heating plate (56), a second hot pressing plate (57), a hot pressing carrier (58), and a third driving device (59), the hot pressing carrier (58) is provided with a fixing groove (581) adapted to the shape of the battery cell, and the third driving device (59) drives the third mounting plate (54) to move laterally on the second slide rail (52).

2. A double-layer multi-station hot press for lithium battery cells according to claim 1, characterized in that: The boosting assembly (3) comprises a first fixed plate (31) mounted on the top of the bracket (2), and a boosting cylinder (32) fixed on the first fixed plate (31), and the first upper hot pressing assembly (4) is transmission-connected to the boosting cylinder (32).

3. A double-layer multi-station hot press for lithium battery cells according to claim 1, characterized in that: The first upper hot pressing assembly (4) / the second upper hot pressing assembly (6) further comprises a resistance testing device (14) arranged on one side of the second fixing plate (9) / the third fixing plate (11) and used for detecting the resistance of the battery cells on the first lower hot pressing assembly (5) / the second lower hot pressing assembly (7).

4. A double-layer multi-station hot press for lithium battery cells according to claim 3, characterized in that: The first upper hot pressing assembly (4) / the second upper hot pressing assembly (6) further comprises a fourth driving device (46) arranged on one side of the second fixed plate (9) / the third fixed plate (11) and an insulating plate (47) connected to the fourth driving device (46) in a transmission manner. The fourth driving device (46) drives the insulating plate (47) to move in a vertical direction, and the resistance testing device (14) is mounted on the insulating plate (47).

5. A double-layer multi-station hot press for lithium battery cells according to claim 1, characterized in that: It also includes a second sensor (15) installed on the third fixing plate (11) and the fourth fixing plate (71) and used to detect whether the battery cell in the fixing groove (581) has moved into place and is located below the first hot pressing plate (41). The third mounting plate (54) is provided with a sensing block (541).

6. A double-layer multi-station hot press for lithium battery cells according to claim 1, characterized in that: It also includes a first sensor (17) mounted on the third mounting plate (54) and used to detect whether there is a battery cell in the first fixing groove (581).

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