A first layer of separator film structure of a lithium battery laminated sheet

Abstract

The application discloses a lithium battery lamination first-layer diaphragm film covering structure which is integrally installed on a lamination machine equipment and is used for lamination of an electric core; the lamination machine equipment comprises a guide piece, a positioning piece, a cutting piece and a lamination platform which are sequentially arranged; the lamination platform is used for film covering and supporting the electric core; after lamination of a previous electric core is completed, the diaphragm is pressed by the positioning piece, and then the diaphragm between the lamination platform and the positioning piece is cut off by the cutting piece; therefore, after the diaphragm is cut off, the end of the diaphragm is fixed, and then the diaphragm is translated by the guide piece, so that the diaphragm is turned over and laminated, the influence of film pulling on physical properties of the diaphragm is overcome, the influence of film blowing on instability of the diaphragm caused by wrinkles is overcome, and the problem of a deviation rectifying structure required by film pulling and film blowing is also overcome; the structure is simple, efficiency is improved, and errors are reduced.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing technology, and specifically to a coating structure for the first layer separator of a lithium battery stack. Background Technology

[0002] Lithium-ion batteries are batteries whose electrochemical system contains lithium, including metallic lithium, lithium alloys, lithium ions, and lithium polymers. The battery cell is the core component of a lithium-ion power battery, and cells are generally produced using specialized stacking machines. A stacking machine is a device that layers positive and negative electrode sheets and separators together to form a bare battery cell; that is, it stacks the separator, negative electrode sheet, separator, positive electrode sheet, and separator together in a prescribed order. Currently, separators are continuously fed during manufacturing. Existing large-size cells generally do not have a separator finishing process after stacking. This is because the manufacturing process requires that the separator be cut after the previous cell is produced, and the cut portion (not the cell side) of the separator is flipped and pulled to a suitable position on the stacking platform for the next cell production, achieving cyclic stacking and improving cell production efficiency.

[0003] In the lithium battery industry's stacking process, to maximize energy storage, fully utilize battery pack space, and consider the energy resistance within individual cells, the separator is typically only stacked as a single layer. Without a separator finishing layer, to stack the next cell, the separator needs to be pulled to the side of the first layer and rotated 180 degrees. Furthermore, the separator requires high quality, free from dents, scratches, or other defects that could affect its quality.

[0004] In existing technologies, separators, negative electrode sheets, and positive electrode sheets are stacked on a stacking platform. When coating the first layer of separator, a correction shaft is generally used to correct the position of the first layer separator. Currently, in the slicing process, the first layer separator is generally coated using either a film pulling or a back-blowing method. Specifically: film pulling involves a robotic arm clamping the cut non-cell side separator and pulling the cut end of the separator back to the corresponding position on the stacking platform. Then, the robotic arm rotates the separator 180 degrees and re-lays it on the stacking platform. The correction shaft then corrects the separator to the appropriate stacking position before starting the stacking of the next cell. Back-blowing involves directly blowing the cut non-cell side separator onto the first electrode sheet stacking side using positive pressure gas. Then, the correction shaft moves to pull the back-blown separator to the appropriate stacking position on the stacking platform.

[0005] The two methods of first-layer diaphragm coating mentioned above can no longer meet the production needs of customers. The stretching method takes a long time, at least 15 seconds; the back-blowing method is also time-consuming and unstable because the diaphragm is easily affected in its free state, resulting in poor stability. This can easily lead to the production of cells with excessively long diaphragms, poor diaphragm alignment, or diaphragm wrinkles, resulting in NG cells, wasting resources and reducing production. Summary of the Invention

[0006] The main technical problem this invention addresses is how to improve the efficiency, effect, and production stability of the first-layer diaphragm coating.

[0007] One embodiment provides a first-layer separator coating structure for lithium battery stacking.

[0008] A lithium battery stacking first-layer separator coating structure, characterized in that it includes a guide, a positioning member, a cutting member, and a stacking platform arranged sequentially; the stacking platform is used for coating and supporting the battery cells;

[0009] The positioning component includes a mounting bracket, a top plate, a pressure plate, and a driving component;

[0010] The top plate is disposed on the top wall of the mounting frame, and two sets of pressure plates are disposed at both ends of the top plate, with the distribution direction of the two sets of pressure plates perpendicular to the length direction of the diaphragm; the pressure plates are used to press the diaphragm between the pressure plates and the top plate, and the driving component is disposed on the mounting frame and is used to drive the pressure plates away from the top plate;

[0011] The cutting member is used to cut the diaphragm, the guide member is used to guide the diaphragm, and the guide member can translate along the distribution direction of the guide member, the positioning member and the stacking platform.

[0012] Furthermore, the guide includes at least one set of guide rollers, the set of guide rollers including two parallel and rotating shaft rollers, and the diaphragm passing between the two guide rollers to guide the diaphragm.

[0013] Furthermore, the top plate is hollow, and the surface of the top plate has several adsorption holes that communicate with the inner cavity of the top plate. The top plate is provided with an air pipe connector that communicates with the inner cavity of the top plate. The air pipe connector is used to connect to an external vacuum source to continuously pump pressure into the inner cavity of the top plate.

[0014] Furthermore, the top plate includes a horizontal section and a vertical section arranged at an angle, with the vertical section facing one side of the stacking platform.

[0015] Furthermore, the cutting component includes a fixing member and a pressure roller and a cutter disposed on the fixing member. The pressure roller is parallel to the guide roller, and the fixing member remains relatively stationary with respect to the guide roller along the translational direction of the guide roller. The cutter is disposed laterally close to the stacking platform, and the cutting edge of the cutter is disposed lower than the pressure roller in the height direction. The pressure roller and the cutter are capable of moving up and down in a direction perpendicular to the stacking platform.

[0016] Furthermore, the positioning component also includes a drive motor and a ball screw. The top plate is disposed on the top wall of the mounting frame, the drive motor is disposed on the mounting frame, the ball screw is coaxially connected to the output shaft of the drive motor, and the ball screw is axially perpendicular to the stacking platform. The screw nut on the ball screw is used to drive the top plate to rise and fall.

[0017] Furthermore, the mounting frame includes a base plate, a mounting seat, and a support seat. The base plate is used to mount the stacking machine, the mounting seat is fixed on the base plate, and is used to mount the drive motor. The support seat is slidably connected to the mounting seat, the screw nut on the ball screw is fixedly mounted on the support seat, and the top plate is disposed on the top wall of the support seat.

[0018] Furthermore, the driving component includes a vertical moving cylinder and a front-back moving cylinder. The front-back moving cylinder is mounted on the support base, the vertical moving cylinder is mounted at one end of the output shaft of the front-back moving cylinder, and the pressure plate is mounted at one end of the output shaft of the vertical moving cylinder.

[0019] Furthermore, the positioning component also includes a left and right translation cylinder, which is disposed on the side of the top plate away from the stacking platform, and the top plate is mounted on one end of the output shaft of the left and right translation cylinder. The left and right translation cylinder is used to drive the top plate to translate, so that the vertical section abuts against the side wall of the stacking platform.

[0020] Furthermore, the positioning component also includes a controller, a sensor, and a sensing plate. The sensing plate is mounted on the mounting base. The sensor is used to sense the position of the screw nut on the ball screw. Both the sensor and the drive motor are electrically connected to the controller. When the position of the screw nut on the ball screw exceeds the set range of the sensor, the drive motor is turned off.

[0021] According to the above embodiment of a lithium battery stacking first-layer separator coating structure, after the previous cell is stacked, the pressure plate, under the action of the driving component, presses and fixes the separator to the top plate. Then, the separator between the top plate and the stacking platform is cut by the cutting component. Before the separator is cut, the pressure plate presses the separator firmly, and after the separator is cut, the position of the first membrane end is fixed. Then, the translation guide is moved to the other side of the stacking platform, thereby driving the separator to flip and directly lay flat on the stacking platform, completing the flipping and coating of the separator in sequence. Compared with the traditional membrane pulling and separator back blowing, this structure can ensure the separator's... The membrane is flat and stable, avoiding wrinkles or misalignment, ensuring the stability of its physical state and unaffected by wind resistance or the parallelism of the robot's movement. Because the membrane end is always held in a controlled clamping state by the positioning component, there is no need for a correction component, reducing costs and simplifying the structure. It also reduces uncontrollable factors and improves efficiency. The suction and pressing structure can complete the coating effect with simple actions, reducing the number of coating operation steps, reducing the cumulative error caused by multiple steps, and indirectly increasing product yield and stacking efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first-layer separator coating structure of the lithium battery stack according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the positioning element in one embodiment;

[0024] Figure 3 for Figure 2 A structural diagram from another perspective;

[0025] Figure 4 for Figure 3 Enlarged view of section A;

[0026] Figure 5 for Figure 1 A schematic diagram of the overall structure of the mounting bracket.

[0027] Reference numerals: 1. Guide component; 11. Shaft roller; 2. Positioning component; 21. Mounting bracket; 211. Base plate; 212. Mounting seat; 213. Support seat; 214. Mounting plate; 215. Horizontal guide rail; 216. Horizontal slider; 217. Vertical guide rail; 218. Vertical output; 22. Top plate; 221. Adsorption hole; 222. Air pipe connector; 223. Horizontal section; 224. Vertical section; 23. Pressure plate; 24. Driving component; 241. Up and down moving cylinder; 242. Forward and backward moving cylinder; 25. Left and right translation cylinder; 26. Drive motor; 27. Ball screw; 271. Screw nut; 28. Sensor; 281. Sensing plate; 3. Cutting component; 31. Pressure roller; 32. Cutter; 4. Stacking platform; 5. Diaphragm. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0029] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0030] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0031] A wafer stacking machine is a device that stacks positive and negative electrode sheets and separators together to form a bare battery cell. This involves stacking the separator, negative electrode sheet, separator, positive electrode sheet, and separator in a prescribed order. Currently, the separator is continuously fed during manufacturing. After the previous cell is produced, the separator needs to be cut, and the side of the separator not on the cut side is flipped and pulled to a suitable position on the stacking platform for the next cell production, achieving cyclic stacking to improve cell production efficiency. Currently, during the wafer slicing process, the first layer of separator is typically coated using either a film stretching or back-blowing method. However, film stretching requires a robotic arm to hold and pull the separator, which is time-consuming; back-blowing is time-consuming and the airflow is unstable because the separator is easily affected in a free state, resulting in poor stability and the production of cells with excessively long separators, poor separator alignment, or separator wrinkles, thus producing substandard cells.

[0032] In this embodiment of the invention, the working platform of the stacking machine is horizontal. "Up and down" refers to the height direction based on the working platform of the stacking machine; "left and right" refers to the length direction of the feeding diaphragm of the stacking machine; and "front and back" refers to the width direction of the feeding diaphragm.

[0033] This application discloses a first-layer separator coating structure for lithium battery stacking, which is installed on a stacking machine for cell stacking. It includes a guide 1, a positioning member 2, a cutting member 3, and a stacking platform 4 arranged in sequence. The stacking platform 4 is used for coating and supporting the cells. After the previous cell is stacked, the positioning member 2 presses down the separator 5, and the cutting member 3 cuts the separator 5 between the stacking platform 4 and the positioning member 2. Therefore, after the separator 5 is cut, the end of the separator 5 is fixed. Then, the guide 1 drives the separator 5 to translate, which can realize the flipping and stacking of the separator 5. This overcomes the influence of film pulling on the physical properties of the separator 5, overcomes the influence of blown film causing the separator 5 to wrinkle and become unstable, and also overcomes the problem of needing a correction structure for film pulling and blown film. The structure is simple, improves efficiency, and reduces errors.

[0034] Reference Figure 1 The guide component 1 includes at least one set of guide rollers, which includes two parallel and rotating shaft rollers 11. The diaphragm 5 passes between the two guide rollers to guide the diaphragm 5. The number of guide rollers can be configured according to the size of the stacking machine. The diaphragm 5 passes between the two shaft rollers 11. The rotating shaft rollers 11 can not only guide and limit the diaphragm 5, but also ensure the feeding stability of the diaphragm 5.

[0035] Reference Figure 2 and Figure 3 The positioning component 2 includes a mounting frame 21, a top plate 22, a pressure plate 23, and a driving component 24. The mounting frame 21 includes a base plate 211, a mounting seat 212, and a support seat 213. The base plate 211 is used to assemble on the stacking machine. The bottom end of the mounting seat 212 is fixed on the base plate 211. The support seat 213 is connected to the mounting seat 212. The top wall of the support seat 213 is fixed with a mounting plate 214, which is used to mount the top plate 22. Two sets of pressure plates 23 are provided and are respectively provided at both ends of the top plate 22. The distribution direction of the two sets of pressure plates 23 is perpendicular to the length direction of the diaphragm 5. The pressure plates 23 are used to press the diaphragm 5 between the pressure plates 23 and the top plate 22. The driving component 24 is provided on the mounting frame 21 and is used to drive the pressure plates 23 away from the top plate 22.

[0036] Reference Figure 4 and Figure 5 The driving component 24 includes a vertical moving cylinder 241 and a horizontal moving cylinder 242. The horizontal moving cylinder 242 is fixed on the mounting plate 214, and the vertical moving cylinder 241 is fixed at one end of the output shaft of the horizontal moving cylinder 242. The pressure plate 23 is disposed at one end of the output shaft of the vertical moving cylinder 241. Similarly, the positions of the horizontal moving cylinder 242 and the vertical moving cylinder 241 can be interchanged, so that the pressure plate 23 moves away from the top plate 22 in both the vertical and horizontal directions, which facilitates the movement and stacking of the diaphragm 5.

[0037] Reference Figure 4The top plate 22 is configured as a corner type, including a horizontal section 223 and a vertical section 224. The vertical section 224 is set towards the stacking platform 4. The top plate 22 is configured as a vacuum suction plate, that is, the top plate 22 is hollow. The vertical section 224 is evenly distributed and has adsorption holes 221. The top plate 22 is provided with an air pipe connector 222 that communicates with the inner cavity of the top plate 22. The air pipe connector 222 is used to connect to an external vacuum source. The external vacuum source can continuously pump pressure into the inner cavity of the top plate 22 through the air pipe connector 222, so that outside air continuously enters the inner cavity of the top plate 22 through multiple adsorption holes 221. Then, when the diaphragm 5 contacts the top plate 22, it is directly adsorbed onto the top plate 22 under the influence of air pressure. On the one hand, it fixes the diaphragm 5, and on the other hand, it can also make the separated diaphragm 5 bend and adsorbed on the corner vertical section 224.

[0038] Reference Figure 5 The top plate 22 is slidably connected to the top wall of the support base 213. A horizontal guide rail 215 is fixed on the mounting plate 214. A horizontal slider 216 matching the horizontal guide rail 215 is provided on the bottom wall of the top plate 22. At least one set of left and right translation cylinders 25 is provided on the side of the top plate 22 away from the stacking platform 4. In this embodiment, only one set of left and right translation cylinders 25 is used. In this embodiment, the left and right translation cylinders 25 are installed and fixed on the mounting base 212, and one end of the output shaft of the left and right translation cylinder is fixed on the top plate 22. The output shaft of the left and right translation cylinder 25 is arranged in the left and right direction and is used to drive the top plate 22 to translate in the left and right direction. The top plate 22 moves under the action of the left and right translation cylinders 25 and presses tightly against the stacking platform 4, so that the diaphragm 5 adsorbed at the vertical section 224 is clamped between the vertical section 224 and the stacking platform 4, further fixing the diaphragm 5.

[0039] Reference Figure 1 The cutting component 3 includes a fixing component and a pressure roller 31 and a cutter 32 connected to the fixing component. The pressure roller 31 is parallel to the guide roller, and the fixing component remains relatively stationary with respect to the guide roller along the translational direction of the guide roller. The cutter 32 is laterally positioned close to the stacking platform 4, that is, the cutter 32 is laterally positioned between the pressure roller 31 and the stacking platform 4; and the cutting edge of the cutter 312 is positioned lower than the pressure roller 31 in the height direction, that is, in the height direction, the cutting edge of the cutter 32 is positioned between the pressure roller 31 and the stacking platform 4; the pressure roller 31 and the cutter 32 can move up and down in a direction perpendicular to the stacking platform 4. During cutting, the pressure roller 31 and the cutter 32 fall until the pressure roller 31 presses the diaphragm 5. During the downward pressing process, the cutter 32 cuts the diaphragm 5 between the stacking platform 4 and the top plate 22 and presses the diaphragm 5 down and bends it to the vertical section 224 for adsorption and pre-fixation.

[0040] Reference Figure 2The top plate 22 can be raised and lowered. The positioning component 2 also includes a drive motor 26 and a ball screw 27. The drive motor 26 is vertically mounted on the mounting bracket 21. The ball screw 27 is coaxially connected to the output shaft of the drive motor 26, and its axial direction is perpendicular to the stacking platform 4. The screw nut 271 on the ball screw 27 is used to fix it to the support base 213. A vertical guide rail 217 is mounted on the side wall of the mounting base 212, and a vertical slider that cooperates with the vertical guide rail 217 is provided on the support base 213. The support base 213 is slidably connected to the mounting base 212 through the vertical slider and the guide rail. When the output shaft of the drive motor 26 rotates, the rotation is converted into the vertical raising and lowering of the screw nut 271 via the ball screw, thus realizing the raising and lowering of the top plate 22.

[0041] The diaphragm 5, which is sandwiched between the stacking platform 4 and the top plate 22, is the length of the diaphragm not required by the battery cell. It is generally a "margin" in the design. The lifting and lowering of the top plate 22 is used to adjust the relative height between the top plate 22 and the stacking platform 4, thereby adjusting the length of the diaphragm 5 sandwiched between them, and can be adjusted according to customer requirements.

[0042] Reference Figure 2 The positioning component 2 also includes a controller, a sensor 28, and a sensing plate 281. The sensing plate 281 is mounted on the mounting base 212. The sensor 28 is used to sense the position of the screw nut 271 on the ball screw 27. Both the sensor 28 and the drive motor 26 are electrically connected to the controller. When the position of the screw nut 271 on the ball screw 27 exceeds the set range of the sensor 28, the drive motor 26 is turned off to protect the equipment and operational safety.

[0043] The implementation principle of this application embodiment is as follows: After the previous cell is stacked, the external vacuum source is activated to start the vacuum adsorption of the top plate 22. Then, the drive unit 24 is activated, and the pressure plate 23 is driven to approach the diaphragm 5 and press down the diaphragm 5 through the up-down moving cylinder 241 and the back-and-forth moving cylinder 242 until the diaphragm 5 contacts the top plate 22 and is pressed and fixed by the pressure plate 23 on the horizontal section 223 of the top plate 22. After that, the cutting unit 3 descends and presses down the diaphragm 5 between the stacking platform 4 and the top plate 22. Under the pressure of the downward press, the diaphragm 5 is cut, and one end of the cut diaphragm 5 is transferred together with the previous cell structure. The other end is pressed down by the pressure roller 31 and is attracted and fixed by the vertical section 224 of the top plate 22. The cutting part 3 rises to complete the cutting of the diaphragm 5. The drive motor 26 is started, so that the drive motor 26 drives the support seat 213 to rise and fall through the ball screw 27 to adjust the relative height between the stacking platform 4 and the top plate 22. Then the left and right translation cylinder 25 is started, and the top plate 22 and the diaphragm 5 fixed on the top plate 22 are moved closer to the stacking platform 4 until the diaphragm 5 attracted by the vertical section 224 is clamped between the side wall of the stacking platform 4 and the vertical section 224. The diaphragm 5 in the horizontal section 223 is held by the pressure plate 23, and the diaphragm 5 in the vertical section 224 is held by the stacking platform 4 and the side wall of the top plate 22. At this time, the holding and adsorption of the diaphragm 5 are removed. Then, the driving component 24 is activated to move the pressure plate 23 away from the diaphragm 5, so that the diaphragm 5 is only held and fixed by the top plate 22 and the stacking platform 4 at its end, and then the first layer of film is applied. The translation guide 1 is moved to the other side of the stacking platform 4, so that the diaphragm 5 is flipped and laid flat on the stacking platform 4, thereby realizing the film application of the first layer of diaphragm 5.

[0044] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A first-layer separator coating structure for lithium battery stacking, characterized in that, It includes a guide (1), a positioning component (2), a cutting component (3), and a stacking platform (4) arranged in sequence; the stacking platform (4) is used for coating and supporting the battery cell; The positioning component (2) includes a mounting bracket (21), a top plate (22), a pressure plate (23), a driving component (24), and a left and right translation cylinder (25); The top plate (22) is disposed on the top wall of the mounting frame (21). Two sets of pressure plates (23) are disposed at both ends of the top plate (22), and the distribution direction of the two sets of pressure plates (23) is perpendicular to the length direction of the diaphragm (5). The pressure plates (23) are used to press the diaphragm (5) between the pressure plates (23) and the top plate (22). The driving member (24) is disposed on the mounting frame (21) and is used to drive the pressure plates (23) away from the top plate (22). The top plate (22) is configured as a vacuum suction plate for adsorbing the diaphragm (5). The top plate (22) includes a horizontal section (223) and a vertical section (224) arranged at an angle, the vertical section (224) being arranged towards the side of the stacking platform (4); The left and right translation cylinder (25) is used to drive the top plate (22) to translate, and make the vertical section (224) abut against the side wall of the stacking platform (4); The cutting component (3) is used to cut the diaphragm (5). The cutting component (3) includes a fixing component and a pressure roller (31) and a cutter (32) disposed on the fixing component. The pressure roller (31) and the cutter (32) can move up and down in a direction perpendicular to the stacking platform (4). The guide (1) is used to guide the diaphragm (5), and the guide (1) can translate along the distribution direction of the guide (1), the positioning member (2) and the stacking platform (4) to drive the diaphragm (5) to translate to the other side of the stacking platform (4).

2. The lithium battery stacked first-layer separator coating structure as described in claim 1, characterized in that, The guide (1) includes at least one set of guide rollers, the set of guide rollers including two parallel and rotating shaft rollers (11), the diaphragm (5) passes between the two guide rollers, and the guide rollers guide the diaphragm (5).

3. The lithium battery stacked first-layer separator coating structure as described in claim 2, characterized in that, The top plate (22) is hollow, and the surface of the top plate (22) is provided with a plurality of adsorption holes (221) communicating with the inner cavity of the top plate (22). The top plate (22) is provided with an air pipe connector (222) communicating with the inner cavity of the top plate (22). The air pipe connector (222) is used to connect to an external vacuum source to continuously pump pressure into the inner cavity of the top plate (22).

4. The lithium battery stacked first-layer separator coating structure as described in claim 2, characterized in that, The pressure roller (31) is parallel to the guide roller, and the fixing member remains relatively stationary with respect to the guide roller along the translation direction of the guide roller. The cutter (32) is arranged laterally close to the stacking platform (4), and the cutting edge of the cutter (32) is lower than the pressure roller (31) in the height direction.

5. The lithium battery stacked first-layer separator coating structure as described in claim 1, characterized in that, The positioning component (2) also includes a drive motor (26) and a ball screw (27). The top plate (22) is disposed on the top wall of the mounting frame (21). The drive motor (26) is disposed on the mounting frame (21). The ball screw (27) is coaxially connected to the output shaft of the drive motor (26). The ball screw (27) is axially perpendicular to the stacking platform (4). The screw nut (271) on the ball screw (27) is used to drive the top plate (22) to rise and fall.

6. The lithium battery stacked first-layer separator coating structure as described in claim 5, characterized in that, The mounting bracket (21) includes a base plate (211), a mounting seat (212), and a support seat (213). The base plate (211) is used to mount the stacking machine. The mounting seat (212) is fixed on the base plate (211) and is used to mount the drive motor (26). The support seat (213) is slidably connected to the mounting seat (212). The screw nut (271) on the ball screw (27) is fixedly mounted on the support seat (213). The top plate (22) is disposed on the top wall of the support seat (213).

7. The lithium battery stacked first-layer separator coating structure as described in claim 6, characterized in that, The drive unit (24) includes an up-and-down moving cylinder (241) and a front-and-back moving cylinder (242). The front-and-back moving cylinder (242) is mounted on the support base (213). The up-and-down moving cylinder (241) is mounted at one end of the output shaft of the front-and-back moving cylinder (242). The pressure plate (23) is mounted at one end of the output shaft of the up-and-down moving cylinder (241).

8. The lithium battery stacked first-layer separator coating structure as described in claim 6, characterized in that, The left and right translation cylinder (25) is located on the side of the top plate (22) away from the stacking platform (4), and the top plate (22) is installed at one end of the output shaft of the left and right translation cylinder (25).

9. The lithium battery stacked first-layer separator coating structure as described in claim 7, characterized in that, The positioning component (2) also includes a controller, a sensor (28) and a sensing plate (281). The sensing plate (281) is mounted on the mounting base (212). The sensor (28) is used to sense the position of the screw nut (271) on the ball screw (27). The sensor (28) and the drive motor (26) are both electrically connected to the controller. When the position of the screw nut (271) on the ball screw (27) exceeds the set range of the sensor (28), the drive motor (26) is turned off.

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