Battery cell flattening mechanism

Abstract

The utility model relates to a cell flattening mechanism, belonging to the field of lithium battery technology, which includes a support frame; a driving device is arranged on one side of the support frame, and the driving device includes a servo reduction motor and a synchronous pulley assembly; a rotating nut assembly includes a hot pressing flange and a screw rod, a screw nut and a bearing inner ring fixing member inside the hot pressing flange; wherein the hot pressing flange is connected to the support frame, the screw nut is threadedly connected to the screw rod, the outer sleeve of the screw nut is provided with a bearing inner ring fixing member, and the two are connected by fasteners, and the bearing inner ring fixing member is connected to the synchronous pulley assembly; a hot pressing device is arranged in the support frame for hot pressing the cell; the hot pressing device is connected to one end of the screw rod, and is driven by the screw rod to move up and down. The present invention utilizes the screw rod to realize up and down movement to drive the hot pressing device to perform lifting and lowering actions, which greatly saves space, shortens the distance from pre-pressing to hot pressing, and the cell rebounds less after pre-pressing, which is conducive to reducing the hot pressing time and improving efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a battery core flattening mechanism. Background Art

[0002] Large-tonnage hot pressing mechanisms are generally implemented by directly connecting electric cylinders and screws to motors. The motor screw is directly connected to four guide columns, the screw is fixed, and the screw nut drives the pressure plate to move; or the electric cylinder is used with four guide columns to drive the hot pressing plate to press directly; these two implementation methods have high requirements for the height space of the machine. There must be enough space to place the electric cylinder, screw and motor, and the large-tonnage hot pressing mechanism will exist in the form of a single device, which is not conducive to the integration of equipment functions. In winding machine equipment, this method has a great impact on the overall layout of the equipment. Basically, the hot pressing mechanism must be placed in the feeder. The disadvantage of placing it in the feeder is that the distance to the hot pressing mechanism will be very long after pre-pressing, and the battery cell will rebound, which will increase the hot pressing time and affect efficiency. Utility Model Content

[0003] To this end, the technical problem to be solved by the utility model is to overcome the problem that the hot pressing structure in the prior art uses an electric cylinder and a screw rod directly connected to the motor, which has high requirements on the height space of the machine. A battery cell flattening mechanism is provided, which uses a rotating nut assembly and a synchronous wheel and synchronous belt connection to solve the problem that large-tonnage hot pressing mechanisms are too high.

[0004] In order to solve the above technical problems, the utility model provides a battery cell flattening mechanism, comprising:

[0005] Support frame;

[0006] A driving device is arranged on one side of the support frame, the driving device comprises a servo reduction motor and a synchronous pulley assembly, and the output shaft of the servo reduction motor is connected to the synchronous pulley assembly;

[0007] A rotating nut assembly is arranged in the support frame, and the rotating nut assembly includes a hot pressing flange and a screw, a screw nut and a bearing inner ring fixing piece arranged in sequence from the inside to the outside of the hot pressing flange; wherein the hot pressing flange is connected to the support frame, the screw nut is threadedly connected to the screw, a bearing inner ring fixing piece is sleeved on the outside of the screw nut, and the two are connected by fasteners, and the bearing inner ring fixing piece is connected to the synchronous pulley assembly;

[0008] A hot pressing device is arranged in the support frame and is used for hot pressing the battery core; the hot pressing device is connected to one end of the screw rod and is driven by the screw rod to move up and down.

[0009] In one embodiment of the utility model, the rotating nut assembly also includes a deep groove ball bearing and an angular contact bearing, and the first end of the bearing inner ring fixing piece is rotatably connected to the hot pressing flange through the deep groove ball bearing, and the second end is rotatably connected to the hot pressing flange through the angular contact bearing.

[0010] In one embodiment of the utility model, the bearing inner ring fixing piece is provided with a bearing inner retaining ring at the fixed connection with the screw nut.

[0011] In one embodiment of the utility model, a bearing outer retaining ring is provided at the lower end of the hot pressing flange.

[0012] In one embodiment of the utility model, the support frame includes an upper fixed plate, a lower fixed plate and a guide column, and the upper fixed plate and the lower fixed plate are connected by the guide column; the hot pressing device is sleeved on the outer side of the guide column and can slide up and down between the upper fixed plate and the lower fixed plate along the guide column.

[0013] In one embodiment of the utility model, the hot pressing device includes a heating plate fixing plate, a heating plate, a hot pressing plate and a pressing plate; the heating plate fixing plate is sleeved on the outside of the guide column; the pressing plate and the heating plate are respectively arranged on the upper and lower sides of the heating plate fixing plate, the pressing plate is connected to the rotating nut assembly, and the hot pressing plate is connected to the heating plate.

[0014] In one embodiment of the utility model, a linear bearing adapted to the guide column is provided on the heating plate fixing plate, and the linear bearing is fixed on the heating plate fixing plate through a linear bearing sleeve.

[0015] In one embodiment of the utility model, a plurality of blowing holes are provided on the lower surface of the hot pressing plate to prevent the diaphragm of the battery cell from sticking to the hot pressing plate.

[0016] In one embodiment of the present invention, a pressure sensor is further provided on one side of the pressing plate.

[0017] In one embodiment of the utility model, the synchronous pulley assembly includes an active synchronous wheel, a driven synchronous wheel and a synchronous belt, the active synchronous wheel is connected to the output shaft of the servo reduction motor, the driven synchronous wheel is connected to the rotating nut assembly, and the active synchronous wheel and the driven synchronous wheel are driven by a synchronous belt.

[0018] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0019] The battery cell flattening mechanism described in the utility model has a reasonable structural layout. The lead screw nut in the rotating nut assembly rotates under the drive of the synchronous pulley assembly of the driving device. When the lead screw nut rotates, the lead screw realizes up and down movement and drives the hot pressing device to perform lifting and lowering actions, which greatly saves space and shortens the distance from pre-pressing to hot pressing, solving the problem of large-tonnage hot pressing mechanisms being too high. In addition, the battery cell has less rebound after pre-pressing, which is beneficial to reducing the hot pressing time and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the battery cell flattening mechanism in the preferred embodiment of the utility model;

[0022] Figure 2 yes Figure 1 A front view structural schematic diagram of a battery cell flattening mechanism is shown;

[0023] Figure 3 yes Figure 1 A schematic structural diagram of the battery cell flattening mechanism from another angle shown;

[0024] Figure 4 yes Figure 1 An exploded structural diagram of a driven synchronous wheel and a rotating nut assembly of a battery cell flattening mechanism is shown;

[0025] Figure 5 yes Figure 1 A schematic cross-sectional structure diagram of a driven synchronous wheel and a rotating nut assembly of a battery cell flattening mechanism shown;

[0026] Explanation of the reference numerals in the specification: 1. Support frame; 2. Driving device; 21. Servo reduction motor; 211. Servo motor; 212. Reducer; 22. Synchronous pulley assembly; 221. Active synchronous pulley; 222. Driven synchronous pulley; 223. Synchronous belt; 3. Rotating nut assembly; 31. Hot pressing flange; 32. Screw rod; 33. Screw rod nut; 34. Bearing inner ring fixing piece; 4. Hot pressing device; 41. Heating plate fixing plate; 42. Heating plate; 43. Hot pressing plate; 44. Pressing plate; 45. Pressure sensor; 411. Position sensor; 35. Deep groove ball bearing; 36. Angular contact bearing; 37. Bearing inner retaining ring; 38. Bearing outer retaining ring; 11. Upper fixing plate; 12. Lower fixing plate; 13. Guide column; 15. Linear bearing. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] Reference Figure 1 and 2 As shown, the utility model provides a cell flattening mechanism, comprising: a support frame 1; the support frame 1 comprises an upper fixing plate 11, a lower fixing plate 12 and a guide column 13, the upper fixing plate 11 and the lower fixing plate 12 are connected by the guide column 13; the hot pressing device 4 is slidably connected to the guide column 13, and can slide up and down between the upper fixing plate 11 and the lower fixing plate 12 along the guide column 13;

[0029] The driving device 2 is arranged at one side of the support frame 1, and the driving device 2 includes a servo reduction motor 21 and a synchronous pulley assembly 22, wherein the output shaft of the servo reduction motor 21 is connected to the synchronous pulley assembly 22; the servo reduction motor 21 includes a servo motor 211 and a reducer 212, wherein the servo motor 211 and the reducer 212 are connected via a connector; the synchronous pulley assembly 22 includes an active synchronous wheel 221, a driven synchronous wheel 222 and a synchronous belt 223, wherein the active synchronous wheel 221 is connected to the output shaft of the servo reduction motor 21, the driven synchronous wheel 222 is connected to the rotating nut assembly 3, and the active synchronous wheel 221 and the driven synchronous wheel 222 are driven via a synchronous belt 223;

[0030] The rotating nut assembly 3 is arranged in the support frame 1, such as Figure 4As shown, the rotating nut assembly 3 includes a hot pressing flange 31 and a screw 32, a screw nut 33 and a bearing inner ring fixing piece 34 are sequentially arranged inside the hot pressing flange 31 from the inside to the outside; wherein the hot pressing flange 31 is connected to the support frame 1, the screw nut 33 is threadedly connected to the screw 32, the bearing inner ring fixing piece 34 is sleeved on the outside of the screw nut 33, and the two are connected by fasteners, the bearing inner ring fixing piece 34 is connected to the synchronous pulley assembly 22, specifically, the bearing inner ring fixing piece 34 is connected to the driven synchronous wheel 222, when the driven synchronous wheel 222 rotates, the bearing inner ring fixing piece 34 is driven to rotate, the bearing inner ring fixing piece 34 drives the screw nut 33 to rotate, the screw nut 33 is threadedly connected to the screw 32, thereby driving the screw 32 to move. The hot pressing device 4 is arranged in the support frame 1, connected to one end of the screw 32, and driven by the screw 32 to move up and down. In this embodiment, the hot pressing device 4 includes a heating plate fixing plate 41, a heating plate 42, a hot pressing plate 43 and a pressing plate 44; the heating plate fixing plate 41 is slidably connected to the guide column 13, the pressing plate 43 and the heating plate 42 are respectively arranged on the upper and lower sides of the heating plate fixing plate 41, one side of the pressing plate 44 is connected to the rotating nut assembly 3, and the other side is connected to the heating plate fixing plate 41 through screws, and the hot pressing plate 43 is connected to the heating plate 42. When the screw rod 32 moves up and down, the heating plate fixing plate 41 is driven to move through the pressing plate 44, thereby driving the heating plate 42 and the hot pressing plate 43 to move together, and when the battery cell is sent to the bottom of the hot pressing plate 43, the hot pressing treatment of the battery cell is realized.

[0031] The servo reduction motor 21 drives the screw 32 in the rotating nut assembly 3 through the synchronous pulley assembly 22, thereby driving the hot pressing plate 43 to move. The driving device 2 is set on one side of the support frame 1, which reduces the overall height of the mechanism. The hot pressing flange 31 of the rotating nut assembly 3 is fixed by four guide columns 13 and the screw 32 is driven to move. Compared with the form in which the screw 32 is fixed and the screw nut 33 moves, its structure is more stable and more suitable for flattening large-tonnage batteries. Figure 5 As shown, the rotating nut assembly 3 also includes a deep groove ball bearing 35 and an angular contact bearing 36, and the deep groove ball bearing 35 and the angular contact bearing 36 are both arranged between the bearing inner ring fixing piece 34 and the hot pressing flange 31; the combination of the bearing inner ring fixing piece 34 and the screw nut 33 forms a space for accommodating the angular contact bearing 36, which is convenient for assembling the rotating nut assembly 3; the first end of the bearing inner ring fixing piece 34 is rotatably connected to the hot pressing flange 31 through the deep groove ball bearing 35, and the second end is rotatably connected to the hot pressing flange 31 through the angular contact bearing 36.

[0032] In addition, the bearing inner ring fixing part 34 is provided with a bearing inner retaining ring 37 at the fixed connection with the screw nut 33; the lower end of the hot pressing flange 31 is provided with a bearing outer retaining ring 38. After the bearing inner retaining ring 37 and the bearing outer retaining ring 38 are installed, the angular contact bearing 36 can be fixed between the bearing inner ring fixing part 34 and the hot pressing flange 31, which can effectively prevent the angular contact bearing 36 from moving in the axial direction.

[0033] Preferably, the heating plate fixing plate 41 is provided with a linear bearing 15 adapted to the guide column 13, and the linear bearing 15 is fixed to the heating plate fixing plate 41 through a linear bearing sleeve. After the linear bearing 15 is installed, the sliding friction resistance between the guide column 13 and the heating plate fixing plate 41 can be reduced, ensuring that the heating plate fixing plate 41 can move smoothly in the process of moving up and down; the side of the heating plate fixing plate 41 is also provided with a position sensor 411 for sensing the descending position of the heating plate fixing plate 41.

[0034] Preferably, a plurality of blowing holes are provided on the lower surface of the hot pressing plate 43. The design of the blowing holes prevents the diaphragm of the battery cell from sticking to the hot pressing plate 43.

[0035] like Figure 3 As shown, in this embodiment, a pressure sensor 45 is also provided on one side of the pressing plate 44, and the pressure sensor 45 is locked in the heating plate fixing plate 41. A groove is provided on the side of the heating plate fixing plate 41 facing the pressing plate 44, and a pressure sensor 45 is provided in the groove. The pressing plate 44 and the heating plate fixing plate 41 are connected by screws, and the surface of the pressing plate 44 is in contact with the pressure sensor 45. After the surface of the pressing plate 44 is deformed by force, it can be pressed on the pressure sensor 45, and the pressure of the pressing plate 44 is controlled by the pressure sensor 45.

[0036] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. The battery cell flattening mechanism is characterized by: include: Support frame; A driving device is arranged on one side of the support frame, the driving device comprises a servo reduction motor and a synchronous pulley assembly, and the output shaft of the servo reduction motor is connected to the synchronous pulley assembly; A rotating nut assembly is arranged in the support frame, and the rotating nut assembly includes a hot pressing flange and a screw rod, a screw rod nut and a bearing inner ring fixing piece arranged in sequence from the inside to the outside of the hot pressing flange; wherein the hot pressing flange is connected to the support frame, the screw rod nut is threadedly connected to the screw rod, a bearing inner ring fixing piece is sleeved on the outside of the screw rod nut, and the two are connected by a fastener, and the bearing inner ring fixing piece is connected to the synchronous pulley assembly; A hot pressing device is arranged in the support frame and is used for hot pressing the battery core; the hot pressing device is connected to one end of the screw rod and is driven by the screw rod to move up and down.

2. The battery cell flattening mechanism according to claim 1, characterized in that: The rotating nut assembly also includes a deep groove ball bearing and an angular contact bearing. The first end of the bearing inner ring fixing piece is rotatably connected to the hot pressing flange via the deep groove ball bearing, and the second end is rotatably connected to the hot pressing flange via the angular contact bearing.

3. The battery cell flattening mechanism according to claim 2, characterized in that: The bearing inner ring fixing piece is provided with a bearing inner retaining ring at the fixed connection position with the screw nut.

4. The battery cell flattening mechanism according to claim 3, characterized in that: A bearing outer retaining ring is arranged at the lower end of the hot pressing flange.

5. The battery cell flattening mechanism according to claim 1, characterized in that: The support frame includes an upper fixing plate, a lower fixing plate and a guide column, wherein the upper fixing plate and the lower fixing plate are connected via the guide column; the hot pressing device is slidably connected to the guide column and can slide up and down between the upper fixing plate and the lower fixing plate along the guide column.

6. The battery cell flattening mechanism according to claim 5, characterized in that: The hot pressing device includes a heating plate fixing plate, a heating plate, a hot pressing plate and a pressing plate; the heating plate fixing plate is slidably connected to the guide column, the pressing plate and the heating plate are respectively arranged on the upper and lower sides of the heating plate fixing plate, the pressing plate is connected to the rotating nut assembly, and the hot pressing plate is connected to the heating plate.

7. The battery cell flattening mechanism according to claim 6, characterized in that: A linear bearing adapted to the guide column is disposed on the heating plate fixing plate, and the linear bearing is fixed to the heating plate fixing plate via a linear bearing sleeve.

8. The battery cell flattening mechanism according to claim 7, characterized in that: A plurality of blowing holes are arranged on the lower surface of the hot pressing plate.

9. The battery cell flattening mechanism according to claim 6, characterized in that: A groove is arranged on one side of the heating plate fixing plate facing the pressing plate, a pressure sensor is arranged in the groove, the pressing plate and the heating plate fixing plate are connected by screws, and the surface of the pressing plate contacts the pressure sensor.

10. The battery cell flattening mechanism according to claim 1, characterized in that: The synchronous pulley assembly includes an active synchronous wheel, a driven synchronous wheel and a synchronous belt. The active synchronous wheel is connected to the output shaft of the servo reduction motor, the driven synchronous wheel is connected to the rotating nut assembly, and the active synchronous wheel and the driven synchronous wheel are driven by a synchronous belt.

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