WO2024088020A1 - Film combining apparatus and winding device - Google Patents

Abstract

A film combining apparatus and a winding device. The film combining apparatus comprises: a first film combining roller; a second film combining roller, a film combining channel being formed between the second film combining roller and the first film combining roller, the film combining channel being used for material strips to pass through and for the starting ends of the material strips to be inserted, at least one of the first film combining roller and the second film combining roller being capable of approaching the other, so as to combine the material strips entering the film combining channel and the starting ends of the material strips; a pressing assembly, which is used for applying pressure to the layers of material strips passing through a pressing position, so that the layers of material strips passing through the pressing position are attached to each other under the action of pressure, the pressing position being located downstream of the film combining channel; and a visual detector, which is used for carrying out visual detection on the starting ends of the material strips in the layers of material strips passing through a detection position, the detection position being located downstream of the pressing position or between the film combining channel and the pressing position.

Description

Film combining device and winding equipment

This disclosure claims the priority of the Chinese patent application filed with the Chinese Patent Office on October 27, 2022, with application number 202222848411.9 and application name “A membrane combining device and winding device”, and the priority of the Chinese patent application filed with the Chinese Patent Office on October 27, 2022, with application number 202211322971.9 and application name “A membrane combining device and winding device”, the entire contents of which are incorporated by reference in this disclosure.

Technical Field

The present disclosure relates to the technical field of battery manufacturing equipment, and in particular to a membrane assembly device and a winding device.

Background technique

The battery cell is an important component of lithium batteries. It is generally formed by winding the four layers of material strips, namely the diaphragm, cathode plate, diaphragm, and anode plate, using a winding needle. Before each layer of material strip enters the winding needle, it is necessary to use a film-joining device to bring each layer of material strip together, and before winding, the starting end of the cathode plate needs to be inserted between the two layers of diaphragms in the film-joining device (i.e., inserting the plate). During the insertion process, the starting end of the cathode plate is prone to defects such as folded corners, so it is necessary to use a detection camera for detection.

However, after the cathode electrode is inserted into the membrane device, the starting end of the cathode electrode is inspected using a detection camera. Since the four layers of material strips, namely the diaphragm, cathode electrode, diaphragm and anode electrode, are not completely fitted together, the image obtained by the detection camera may easily have blurred shadows or no shadows at all, which may lead to incorrect detection results, that is, unreliable detection results.

Summary of the invention

The present disclosure aims to alleviate or solve at least one of the above-mentioned problems to at least some extent.

In one aspect of the present disclosure, a film-stitching device is proposed, comprising: a first film-stitching roller; a second film-stitching roller, wherein a film-stitching channel is formed between the second film-stitching roller and the first film-stitching roller, wherein a material supply tape passes through the film-stitching channel and a starting end of the material supply tape is inserted therein; at least one of the first film-stitching roller and the second film-stitching roller can be approached toward the other to bring together the material tapes entering the film-stitching channel and the starting ends of the material tapes; a pressing assembly, wherein the pressing assembly is used to apply pressure to the material tapes of each layer passing through a pressing station, wherein the material tapes of each layer passing through the pressing station adhere to each other under the action of the pressure, and the pressing station is located downstream of the film-stitching channel; and a visual detector, wherein the visual detector is used to perform visual detection on the starting ends of the material tapes of each layer passing through an inspection station, and the inspection station is located downstream of the pressing station or between the film-stitching channel and the pressing station.

Optionally, the clamping assembly includes: a movable roller, which is arranged at the clamping station and can be controlled to move close to each layer of material strip passing through the clamping station to tension each layer of material strip passing through the clamping station.

Optionally, the film-joining device has a first state and a second state; when the film-joining device is in the first state, the first film-joining roller and the second film-joining roller are spaced a preset distance apart so that the film-joining channel can be inserted into the starting end of the material tape, and the active roller and the second film-joining roller bring the layers of material tape together so that the brought together layers of material tape can enter the slit on the winding needle located downstream of the pressing station; when the film-joining device is in the second state, the first film-joining roller and the second film-joining roller clamp the layers of material tape passing through the film-joining channel and the starting end of the material tape, and the active roller moves toward the layers of material tape passing through the pressing station to tension the layers of material tape passing through the pressing station.

Optionally, the film-stitching device also includes: a first motion mechanism, the first motion mechanism includes a first transfer seat and a first driving assembly; the first film-stitching roller and the movable roller are both rotatably connected to the first transfer seat, and the first transfer seat is arranged at the driving end of the first driving assembly, so that the first driving assembly can drive the first transfer seat to move, so as to drive the first film-stitching roller to move closer to or away from the second film-stitching roller, and drive the movable roller to move closer to or away from each layer of material strip passing through the pressing station.

Optionally, the film-joining device also includes: a tab smoothing assembly, which is mounted on the first transfer seat. When the first transfer seat drives the first film-joining roller to move close to the second film-joining roller, the first transfer seat drives the tab smoothing assembly to move close to the battery cell on the winding needle located downstream of the pressing station, so that the tab smoothing assembly can smooth the tabs of the battery cell.

Optionally, the tab smoothing assembly includes: a smoothing drive component, which is mounted on the first transfer seat; and a smoothing plate, which is mounted on the driving end of the smoothing drive component, so that the smoothing drive component can drive the smoothing plate to approach the tab of the battery cell until it contacts and smoothes the tab of the battery cell.

Optionally, the tab smoothing assembly further includes: a mounting block, the mounting block being connected to a driving end of the smoothing driving member, the smoothing plate being rotatably connected to the mounting block; an elastic member, the elastic member abutting between the mounting block and the smoothing plate, the elastic member being used to provide elastic force to the smoothing plate, so that when the outer diameter of the battery cell gradually increases, the smoothing plate can always maintain contact with the tab of the battery cell under the action of the elastic force.

Optionally, the elastic member is a torsion spring, and the tab smoothing assembly further includes: a rotating shaft, the smoothing plate is rotatably connected to the mounting block via the rotating shaft, the torsion spring is sleeved on the rotating shaft, and one force arm of the torsion spring abuts against the mounting block, and the other force arm of the torsion spring abuts against the smoothing plate, and the smoothing plate remains in contact with the tab of the battery cell under the action of the elastic force provided by the torsion spring.

Optionally, the film-joining device also includes: a second motion mechanism, the second motion mechanism includes a second transfer seat and a second driving assembly, the second film-joining roller is rotatably connected to the second transfer seat, the second transfer seat is arranged at the driving end of the second driving assembly, and the second driving assembly is used to drive the second transfer seat to move so as to drive the second film-joining roller to approach or move away from the first film-joining roller.

Optionally, the pressing assembly includes: a first blowing member, which is used to blow air to each layer of the material strip passing through the pressing station, so that the layers of the material strip passing through the pressing station are fitted to each other.

Optionally, the film-joining device also includes: a first transfer seat, which can approach and move away from the layers of material strips passing through the pressing station, and the first blowing member is installed on the first transfer seat so that the first blowing member follows the first transfer seat to approach or move away from the layers of material strips passing through the pressing station.

Optionally, the first blowing member is a first blowing tube, the length direction of the first blowing tube is consistent with the width direction of each layer of material strip, the first blowing tube is provided with a plurality of first blowing ports, the plurality of first blowing ports are arranged at intervals along the length direction of the first blowing tube, and the first blowing ports are used to blow air to each layer of material strip passing through the pressing station.

Optionally, the blowing angle and/or position of the first blowing member on each layer of the material strip is adjustable.

Optionally, the film-joining device also includes: a first mounting seat, the first mounting seat is provided with a first waist-shaped hole, and the first blowing piece is rotatably connected to the first mounting seat; a first locking piece, the first locking piece is passed through the first waist-shaped hole and is threadedly connected to the first transfer seat, the first locking piece can lock and fix the first mounting seat on the first transfer seat; a first fastener, the first fastener is used to lock and fix the first blowing piece on the first mounting seat so that the first blowing piece cannot rotate relative to the first mounting seat.

Optionally, the pressing assembly further includes: a second blowing member, the second blowing member is located on the side of each layer of material strip passing through the pressing station away from the first blowing member, and the second blowing member is used to blow air to each layer of material strip passing through the pressing station.

Optionally, the film bonding device also includes: a blowing drive; a second mounting seat, the second mounting seat is installed at the driving end of the blowing drive to drive the second mounting seat to move through the blowing drive; an adjusting seat, the adjusting seat is installed on the second mounting seat, the second blowing member is installed on the adjusting seat, and the second blowing member can adjust the blowing angle and/or position of each layer of material strip.

Optionally, a second waist-shaped hole is provided on the adjustment seat, and the film-joining device also includes: a second locking piece, which is passed through the second waist-shaped hole and is threadedly connected to the second mounting seat, and the first locking piece can lock and fix the first mounting seat on the first transfer seat; a second fastener, the second blowing piece is rotatably connected to the adjustment seat, and the second fastener is used to lock and fix the second blowing piece on the adjustment seat so that the second blowing piece cannot rotate relative to the adjustment seat.

Optionally, the film bonding device further comprises: a light source, wherein the light source and the visual detector are respectively located on both sides of each layer of the material strip passing through the inspection station, and the light source is used to irradiate each layer of the material strip passing through the inspection station.

In another aspect of the present disclosure, the present disclosure provides a winding device, comprising the film combining device as described in any one of the above items.

Optionally, the winding device also includes: a turret, which is equipped with at least two winding needles, and the winding needles are used to wind each layer of material strip, and the turret can rotate so that each of the winding needles passes through a first station and a second station in sequence, and the first station is located downstream of the film joining device; a cutting device, which is arranged between the first station and the second station, and the cutting device is used to cut off the first diaphragm, the second diaphragm and the anode electrode sheet in each layer of material strip passed.

Therefore, the film-joining device and winding equipment proposed in the present invention use a clamping component to apply pressure to each layer of material tape passing through the film-joining channel, so that the layers of material tape passing through the inspection station are tightly fitted to each other, ensuring that the visual detector can accurately detect whether there is a fold at the starting end of each layer of material tape, thereby avoiding the problem of inaccurate detection results due to incomplete fitting of the layers of material tape.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present disclosure will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

1 to 4 show schematic structural diagrams of a winding device during a winding operation according to an embodiment of the present disclosure;

FIG5 shows a schematic diagram of the installation structure of the first film-forming roller and the movable roller according to an embodiment of the present disclosure;

FIG6 shows a top view of the installation structure of the first film-forming roller and the movable roller according to an embodiment of the present disclosure;

FIG7 shows a bottom view of the installation structure of the first film-forming roller and the movable roller according to one embodiment of the present disclosure;

FIG8 shows a schematic diagram of the installation structure of the second film-forming roller according to an embodiment of the present disclosure;

FIG. 9 shows a top view of a mounting structure of a second film-forming roller according to an embodiment of the present disclosure.

Description of reference numerals:

First diaphragm a1; cathode electrode a2; second diaphragm a3; anode electrode a4;

The first station b1; the second station b2; the third station b3;

Insertion device 10;

Film-joining device 20; first film-joining roller 21; second film-joining roller 22; movable roller 23;

Visual detector 24; Light source 241;

The first motion mechanism 25; the first transfer base 251; the first driving assembly 252; the roller 253;

Tab smoothing assembly 26; smoothing driving member 261; smoothing plate 262; mounting block 263; elastic member 264;

The second motion mechanism 27; the second transfer seat 271; the second base 272; the second linear rail 273; the second screw rod 274; the second driving member 275; the second screw rod nut 276;

The second blowing member 28; the blowing driving member 281; the second mounting seat 282; the adjusting seat 283; the second waist-shaped hole 284;

First blowing member 29; first mounting seat 291; first waist-shaped hole 292;

Winding device 30; turret 31; winding needle 32;

Guide roller 40;

Cutter device 50.

Detailed ways

In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present disclosure, so the present disclosure is not limited by the specific embodiments disclosed below.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Please refer to Figures 1 to 4. An embodiment of the present disclosure provides a winding device, which includes a plurality of unwinding devices (not shown in the drawings), a sheet inserting device 10, a film-joining device 20, a winding device 30, a guide roller 40 and a cutting device 50. Each unwinding device is used to unwind and output the material strip to the film-joining device 20, and the film-joining device 20 brings the passing material strips together. Optionally, the number of unwinding devices is four, and the four unwinding devices unwind and output the first diaphragm a1, the cathode electrode a2, the second diaphragm a3 and the anode electrode a4 respectively. The sheet inserting device 10 is arranged between the unwinding device for outputting the cathode electrode a2 and the film-joining device 20, and is used to cut off the passing cathode electrode a2. The sheet inserting device 10 is also used to transport the starting end of the cathode electrode a2 downstream so that the starting end of the cathode electrode a2 passes through the film-joining device 20, that is, the sheet inserting of the cathode electrode a2 is completed.

Of course, the number of unwinding devices is not limited to four, and the four unwinding devices unwind and output the first diaphragm a1, the cathode electrode piece a2, the second diaphragm a3 and the anode electrode piece a4 respectively. It can also be other numbers and other types of material strips, which are not limited here. For ease of understanding, the following is an example of the number of unwinding devices being four, and the four unwinding devices unwind and output the first diaphragm a1, the cathode electrode piece a2, the second diaphragm a3 and the anode electrode piece a4 respectively.

The winding device 30 includes a turret 31 and at least two winding needles 32 mounted on the turret 31, and each winding needle 32 can extend or retract relative to the turret 31 (i.e., extend or retract in a direction perpendicular to the paper surface as shown in Figures 1 to 4). The turret 31 is rotatably arranged to drive each winding needle 32 to pass through the first station b1 and the second station b2 in sequence. The first station b1 is located downstream of the film-joining device 20, so that each layer of the material strip after being joined together by the film-joining device 20 reaches the winding needle 32 of the first station b1 and is wound on the winding needle 32 to form a battery cell. The guide roller 40 is arranged between the first station b1 and the second station b2, and is used for winding each layer of the material strip between the first station b1 and the second station b2. The cutter device 50 is arranged between the first station b1 and the second station b2, and is used to cut each layer of the material strip passing through. Among them, when the winding needle 32 located at the first station b1 rotates to the second station b2 with the turret 31, another winding needle 32 rotates to the first station b1, and the layers of material tapes located between the first station b1 and the second station b2 are wound on the guide roller 40, that is, the guide roller 40 is used to guide the layers of material tapes located between the first station b1 and the second station b2, so that the slit of the winding needle 32 located at the first station b1 is aligned with the layers of material tapes, and then when the winding needle 32 located at the first station b1 is extended, the layers of material tapes can smoothly enter the slit of the winding needle 32, which is convenient for subsequent winding.

In the above winding equipment, during the actual winding operation, each unwinding device unwinds and outputs the first separator a1, cathode electrode a2, second separator a3 and anode electrode a4 to the film assembly device 20. The film assembly device 20 puts the first separator a1, cathode electrode a2, second separator a3 and anode electrode a4 together, and the layers of material strips after being put together are continuously transported to the winding needle 32 of the first station b1. The winding needle 32 located at the first station b1 rotates to wind the layers of material strips to form a battery cell.

When the winding of a battery cell is completed, the inserting device 10 cuts off the cathode electrode a2 passing through, and the winding needle 32 located at the first station b1 continues to wind each layer of the material strip until the tail end of the cathode electrode a2 is wrapped inside the battery cell. Then, the winding needle 32 located at the first station b1 rotates with the turret 31 to the second station b2, and at the same time, another winding needle 32 rotates with the turret 31 to the first station b1. At this time, due to the rotation of the turret 31, the layers of material strips located between the first station b1 and the second station b2 (at this time, the layers of material strips located between the first station b1 and the second station b2 only include the first diaphragm a1, the second diaphragm a3 and the anode electrode a4) are wound on the guide roller 40. Under the guidance of the guide roller 40, the layers of material strips between the film-joining device 20 and the guide roller 40 are aligned with the slit of the winding needle 32 located on the first station b1, so that when the winding needle 32 located at the first station b1 is extended, the layers of material strips can enter the slit of the winding needle 32 and be clamped and fixed. Then, the cutting device 50 cuts off the layers of material strips between the first station b1 and the second station b2 (that is, the cutting device 50 cuts off the first diaphragm a1, the second diaphragm a3 and the anode electrode a4 at one time), and the winding needle 32 located at the second station b2 rotates until the tail ends of the layers of material strips are wound on the battery cell, so as to facilitate the subsequent processing and unloading of the battery cell on the winding needle 32. Furthermore, since the layers of material strips downstream of the film-joining device 20 are inserted into the slit of the winding needle 32 located at the first station b1, it is only necessary to transport the starting end of the cathode electrode sheet a2 downstream through the sheet-inserting device 10 and insert it into the film-joining device 20 before the next cell can be wound and formed, and there is no need to insert the anode electrode sheet a4. In other words, when one cell is formed, it is only necessary to insert the cathode electrode sheet a2, and there is no need to insert the anode electrode sheet a4, before the next cell can be wound again, which greatly reduces the transition time between the winding and forming of two cells and improves production efficiency.

Specifically, in the embodiment shown in FIGS. 1 to 4 , three winding needles 32 are installed on the turret 31 , and the three winding needles 32 are arranged at intervals along the rotation direction of the turret 31 . The winding device 30 also has a third station b3 , and the three winding needles 32 pass through the first station b1 , the second station b2 and the third station b3 in sequence during the rotation of the turret 31 . Moreover, when one of the winding needles 32 is located at the first station b1 , the other two winding needles 32 are located at the second station b2 and the third station b3 , respectively. As an embodiment, the first station b1 is a winding station, that is, the winding needle 32 located at the first station b1 rotates and winds to form a battery cell; the second station b2 is a gluing station, that is, the battery cell on the winding needle 32 located at the second station b2 is taped to prevent the battery cell from being loose; the third station b3 is a blanking station, that is, the battery cell on the winding needle 32 located at the third station b3 is blanked.

Furthermore, there are three guide rollers 40, which are all installed on the turret 31 to rotate with the turret 31. In addition, each guide roller 40 is located between two adjacent winding needles 32, so that each time one of the winding needles 32 reaches the first station b1, there must be a guide roller 40 that reaches between the first station b1 and the second station b2, so that each layer of the material strip between the first station b1 and the second station b2 can be wound around, so as to guide each layer of the material strip, so that each layer of the material strip can enter the slit of the winding needle 32 when the winding needle 32 that reaches the first station b1 extends. It should be noted that in other embodiments, only the first station b1 and the second station b2 may be included, and only two winding needles 32 may be installed on the turret 31. At this time, the first station b1 is a winding station, and the second station b2 is a material unloading station.

It should be noted that when the inserting device 10 feeds the starting end of the cathode electrode piece a2 into the membrane assembly device 20, the starting end of the cathode electrode piece a2 is located between the first separator a1 and the second separator a3. Under the influence of factors such as friction and collision, the starting end of the cathode electrode piece a2 is prone to folding, thereby adversely affecting the quality of the wound battery cell. Based on the above problem, the present disclosure provides a membrane assembly device 20 that can accurately detect whether the starting end of the cathode electrode piece a2 is folded.

In the embodiment of the present disclosure, the film-forming device 20 includes a first film-forming roller 21, a second film-forming roller 22, a pressing assembly (not marked in the drawings) and a visual detector 24. A film-forming channel (not shown in the drawings) is formed between the first film-forming roller 21 and the second film-forming roller 22, and the film-forming channel is for the first diaphragm a1, the cathode electrode a2, the second diaphragm a3 and the anode electrode a4 to pass through, and the film-forming channel is also for the starting end of the cathode electrode a2 to be inserted when the inserting device 10 inserts the electrode. At least one of the first film-forming roller 21 and the second film-forming roller 22 can approach the other to bring the layers of material strips entering the film-forming channel and the starting end of the cathode electrode a2 together. The layers of material strips passing through the film-forming channel pass through a pressing station, that is, the pressing station is located downstream of the film-forming channel. The pressing assembly is used to apply pressure to the layers of material strips passing through the pressing station, and under the action of the pressure, the layers of material strips passing through the pressing station are tightly attached to each other. Each layer of material strip passing through the film-joining channel also passes through an inspection station, and the inspection station is located downstream of the pressing station or between the film-joining channel and the pressing station. The visual detector 24 is used to visually inspect the starting end of the cathode electrode piece in each layer of material strip passing through the inspection station, so as to determine whether the starting end of the cathode electrode piece a2 is bent. Optionally, the visual detector 24 can be a detection camera.

In this way, by setting up a clamping component to apply pressure to each layer of material strip passing through the membrane channel, the layers of material strip passing through the inspection station are made to fit tightly to each other, ensuring that the visual detector 24 can accurately detect whether the starting end of the cathode electrode a2 in each layer of material strip has a folded angle, thereby avoiding the problem of inaccurate detection results caused by incomplete adhesion of the layers of material strip.

Specifically in the embodiment, the film assembly device 20 further includes a light source 241, and the light source 241 and the visual detector 24 are respectively located on both sides of each layer of the material strip passing through the inspection station. The light source 241 is used to illuminate each layer of the material strip passing through the inspection station, so that the visual detector 24 can detect the starting end of the cathode electrode piece in each layer of the material strip passing through the inspection station more accurately and reliably.

In the embodiment of the present disclosure, the clamping assembly includes an active roller 23 arranged at the clamping station. The active roller 23 can be controlled to move close to each layer of material strip passing through the clamping station to tension each layer of material strip passing through the clamping station so that each layer of material strip fits tightly to each other. In this way, when it is necessary to detect the starting end of the cathode electrode sheet, the active roller 23 is controlled to move toward each layer of material strip passing through the clamping station until each layer of material strip is tensioned so that each layer of material strip passing through the clamping station and upstream and downstream of the clamping station fits tightly to each other, ensuring that the visual detector 24 can accurately detect whether the starting end of the cathode electrode sheet a2 in each layer of material strip has a folded angle, that is, avoiding the problem of inaccurate detection results due to incomplete adhesion of each layer of material strip.

Specifically in the embodiment, the film-joining device 20 has a first state and a second state. When the film-joining device 20 is in the first state, the first film-joining roller 21 and the second film-joining roller 22 are spaced apart by a preset distance so that the film-joining channel can be inserted with the starting end of the cathode electrode sheet, and the movable roller 23 and the second film-joining roller 22 bring the layers of material strips together so that the brought together layers of material strips can enter the slit on the winding needle 32 located at the first station b1 (that is, because the layers of material strips are brought together, the brought together layers of material strips can smoothly enter the slit of the winding needle when the winding needle 32 located at the first station b1 is extended and clamped). When the film-joining device 20 is in the second state, the first film-joining roller 21 and the second film-joining roller 22 clamp the layers of material strips and the starting end of the cathode electrode sheet passing through the film-joining channel, and the movable roller 23 moves toward the layers of material strips passing through the pressing station to tension the layers of material strips passing through the pressing station.

Thus, in the actual winding process, when the winding of a battery cell is completed, the inserting device 10 cuts off the cathode electrode a2 passing through, and the winding needle 32 located at the first station b1 continues to wind each layer of the material strip until the tail end of the cathode electrode a2 is wrapped inside the battery cell. Then, the winding needle 32 located at the first station b1 rotates with the turret 31 to the second station b2, and at the same time, another winding needle 32 rotates with the turret 31 to the first station b1. At this time, due to the rotation of the turret 31, the layers of material strips located between the first station b1 and the second station b2 (at this time, the layers of material strips located between the first station b1 and the second station b2 only include the first diaphragm a1, the second diaphragm a3 and the anode electrode a4) are wound on the guide roller 40. The film-joining device 20 is controlled to be in the first state, that is, the first film-joining roller 21 and the second film-joining roller 22 are spaced a preset distance from each other, and the movable roller 23 and the second film-joining roller 22 bring the first diaphragm a1, the second diaphragm a3 and the anode electrode a4 together, so that under the guiding effect of the guide roller 40 on each layer of the material strip and the bringing together effect of the movable roller 23 and the second film-joining roller 22 on each layer of the material strip, each layer of the material strip passing through the first station b1 is aligned with the slit of the winding needle 32 located on the first station b1. Then, the winding needle 32 located at the first station b1 is controlled to extend, so that each layer of the material strip passing through the first station b1 enters the slit of the winding needle 32 and is clamped and fixed. Then, the cutting device 50 cuts off the layers of material strips between the first station b1 and the second station b2 (i.e., the cutting device 50 cuts off the first diaphragm a1, the second diaphragm a3 and the anode electrode a4 at one time), and the winding needle 32 located at the second station b2 rotates until the tail ends of the layers of material strips are wound on the battery cell. At this time, the inserting device 10 transports the starting end of the cathode electrode a2 downstream and inserts it into the film-joining channel between the first film-joining roller 21 and the second film-joining roller 22. Then, the film-joining device 20 is controlled to be in the second state, i.e., the first film-joining roller 22 and the second film-joining roller 23 clamp the first diaphragm a1, the starting end of the cathode electrode a2, the second diaphragm a3 and the anode electrode a4 passing through the film-joining channel; and the movable roller 23 is controlled to continue to move toward the layers of material strips passing through the pressing station to tension the layers of material strips passing through the pressing station so that the layers of material strips are tightly fitted to each other. Then, the winding needle 32 located at the first station b1 performs winding, and when the starting end of the cathode electrode piece passes through the inspection station, the visual detector 24 is used to perform visual inspection on the starting end of the cathode electrode piece.

Please refer to FIGS. 5 to 7 . In some embodiments, the film-forming device 20 further includes a first motion mechanism 25, which includes a first transfer seat 251 and a first drive assembly 252. The first film-forming roller 21 and the movable roller 23 are both rotatably connected to the first transfer seat 251. The first transfer seat 251 is arranged at the driving end of the first drive assembly 252, so that the first drive assembly 252 can drive the first transfer seat 251 to move, so as to drive the first film-forming roller 21 to move closer to or away from the second film-forming roller 22; at the same time, it drives the movable roller 23 to move closer to or away from each layer of the material strip passing through the pressing station.

It should be noted that the first film-stitching roller 21 and the movable roller 23 are both installed on the first transfer seat 251, so that the first driving component 252 can drive the first film-stitching roller 21 and the movable roller 23 to move together, that is, the first film-stitching roller 21 and the movable roller 23 are driven by the same driving component, which saves the required space, helps to simplify the equipment structure and reduce the equipment cost.

Specifically in the embodiment, a plurality of rollers 253 are arranged on the first transfer seat 251, and the plurality of rollers 253 are used for winding the first membrane a1 and guide the wound first membrane a1 to the membrane-joining channel. In other words, the first membrane a1 outputted by the unwinding device is wound around each roller 253 in turn and then passes into the membrane-joining channel.

Optionally, the first drive assembly 252 includes a first base, a first screw, a first drive member and a first screw nut. A first linear rail is provided on the first base, and the first transfer seat 251 is installed on the first base through the first linear rail, so that the movement of the first transfer seat 251 is guided by the first linear rail. The first screw is rotatably connected to the first base, and the rotation axis of the first screw is consistent with the extension direction of the first linear rail. The first drive member is installed on the first base and connected to the first screw, so that the first drive member can drive the first screw to rotate. The first screw nut is threadedly connected to the first screw and fixedly connected to the first transfer seat 251, so that when the first screw rotates, the first screw nut drives the first transfer seat 251 to move along the first linear rail, and then the first transfer seat 251 drives the first film roller 21 and the movable roller 23 to move together. Optionally, the first drive member can be a motor.

Of course, the first drive component 252 is not limited to a linear drive module using a screw pair. In other embodiments, other types of linear drive modules, such as electric cylinders, can also be used as long as they can drive the first transfer seat 251 to move to or away from the first film-joining position. This is not limited here.

In an embodiment of the present disclosure, the clamping assembly includes a first blowing member 29, which is used to blow air to each layer of material strip passing through the clamping station, so that the layers of material strip passing through the clamping station are tightly fitted to each other, further improving the reliability of the detection results of the visual detector 24.

Furthermore, the first blowing member 29 is installed on the first transfer seat 251, so that the first blowing member 29 moves together with the first transfer seat 251, and then the first blowing member 29 follows the first transfer seat 251 to approach or move away from the layers of material strips passing through the pressing station. When the first transfer seat 251 drives the first film roller 21 to move close to the second film roller 22, the first transfer seat 251 drives the first blowing member 29 to approach the layers of material strips passing through the pressing station, so that the first blowing member 29 can blow air to the layers of material strips passing through the pressing station. When the first transfer seat 251 drives the first film roller 21 to move away from the second film roller 22, the first transfer seat 251 drives the first blowing member 29 to move away from the layers of material strips passing through the pressing station.

Optionally, the first blowing member 29 is a first blowing pipe, the length direction of which is consistent with the width direction of each layer of material strip. The first blowing pipe is provided with a plurality of first blowing ports, which are arranged at intervals along the length direction of the first blowing pipe, and each first blowing port is used to blow air to each layer of material strip passing through the pressing station, so that each layer of material strip can be subjected to air pressure in the entire width direction. Furthermore, a first air connection head is installed at the end of the first blowing pipe, and the first air connection head is connected to an external air source through an air supply pipe, so that the airflow provided by the external air source enters the first blowing pipe through the first air connection head, and is then blown out from each first air connection head on the first blowing pipe.

Specifically in the embodiment, the blowing angle and/or the position of the first blowing member 29 relative to the first transfer seat 251 can be adjusted, so as to adjust the blowing angle and/or distance of the first blowing member 29 relative to each layer of material strip passing through the pressing station, so as to adjust the blowing position and air pressure of each layer of material strip.

Optionally, the first motion mechanism 25 further includes a first mounting seat 291 and a first locking member (not shown in the drawings). The first mounting seat 291 is provided with a first waist-shaped hole 292, and the first locking member is penetrated through the first waist-shaped hole 292 and is threadedly connected with the first transfer seat 251 to lock and fix the first mounting seat 291 on the first transfer seat 251. The first blowing member 29 is arranged on the first mounting seat 291, so as to move with the first mounting seat 291 to adjust the position. In this way, when it is necessary to adjust the position of the first blowing member 29, the first locking member is loosened so that the first mounting seat 291 can move relative to the first transfer seat 251, thereby driving the first blowing member 29 on the first mounting seat 291 to move. When the position of the first blowing member 29 is adjusted to the right position, the first locking member is tightened to re-lock and fix the first mounting seat 291 on the first transfer seat 251. Optionally, the first locking member can be a locking screw.

Optionally, the first blowing member 29 is rotatably connected to the first mounting seat 291, and the first blowing member 29 is locked and fixed to the first mounting seat 291 by a first fastener (not shown in the drawings). In this way, when the blowing angle of the first blowing member 29 needs to be adjusted, the first fastener is loosened, and then the first blowing member 29 is rotated relative to the first mounting seat 291 until the blowing angle of the first blowing member 29 is adjusted to the right position. When the blowing angle of the first blowing member 29 is adjusted to the right position, the first fastener is tightened to lock and fix the first blowing member 29 to the first mounting seat 291, so that the first blowing member 29 cannot rotate relative to the first mounting seat 291. Optionally, the first fastener can be a fastening screw.

It should be noted that the adjustment of the blowing angle of the first blowing member 29 and the position relative to the first transfer seat 251 is not limited to the above-mentioned method, and other more common adjustment structures can also be used. As long as the adjustment of the blowing angle and position of the first blowing member 29 can be achieved, it is not limited here.

Specifically in the embodiment, the film-forming device 20 also includes a tab smoothing assembly 26 installed on the first transfer seat 251. When the first transfer seat 251 drives the first film-forming roller 21 to move close to the second film-forming roller 22, the first transfer seat 251 drives the tab smoothing assembly 26 to move close to the battery cell on the winding needle 32 located at the first station b1, so that the tab smoothing assembly 26 can smooth the tab on the battery cell. In this way, during the process of winding the battery cell by the winding needle 32 on the first station b1, the tab smoothing assembly 26 is used to smooth the tab on the battery cell, thereby avoiding warping and deformation of the tab, which is beneficial to improving the quality of the battery cell.

Furthermore, the tab smoothing assembly 26 includes a smoothing driving member 261 and a smoothing plate 262. The smoothing driving member 261 is mounted on the first transfer seat 251, and the smoothing plate 262 is mounted on the driving end of the smoothing driving member 261, so that the smoothing driving member 261 can drive the smoothing plate 262 to approach the tab of the battery cell on the winding needle 32 located at the first station b1 until it contacts the tab of the battery cell, thereby smoothing the tab of the battery cell by using the smoothing plate 262 during the process of winding the battery cell by the winding needle 32. Optionally, the smoothing driving member 261 can be a cylinder.

In one embodiment, the tab smoothing assembly 26 also includes a mounting block 263 and an elastic member 264. The mounting block 263 is connected to the driving end of the smoothing driving member 261, and the smoothing plate 262 is rotatably connected to the mounting block 263. The elastic member 264 abuts between the mounting block 263 and the smoothing plate 262, and is used to provide an elastic force to the smoothing plate 262, so that the smoothing plate 262 has a movement tendency to swing toward the tab of the battery cell under the action of the elastic force, thereby making the smoothing plate 262 always keep in contact with the tab of the battery cell. In this way, in the process of winding the battery cell by the winding needle 32 located at the first station b1, the outer diameter of the battery cell gradually increases, so that the tab squeezes the smoothing plate 262 to overcome the elastic force provided by the elastic member 264 to swing, so as to adapt to the battery cell with a gradually increasing outer diameter, and avoid the smoothing plate 262 from crushing the tab on the battery cell.

Furthermore, the tab smoothing assembly 26 further includes a rotating shaft 265, through which the smoothing plate 262 is rotatably connected to the mounting block 263. The elastic member 264 is a torsion spring, which is sleeved on the rotating shaft 265, and one force arm of the torsion spring abuts against the mounting block 263, and the other force arm of the torsion spring abuts against the smoothing plate 262. The smoothing plate 262 is kept in contact with the tab of the battery cell under the elastic force provided by the torsion spring.

Of course, in order to enable the smoothing plate 262 to adapt to the gradual increase in the outer diameter of the battery cell, it is not limited to the above-mentioned method of setting the elastic member 264. In another embodiment, in the process of winding the winding needle 32 at the first station b1 to form the battery cell, the first driving component 252 drives the tab smoothing component 26 to move away from the winding needle 32 at the first station b1 at a certain speed through the first transfer seat 251, so as to ensure that in the process of the gradual increase in the outer diameter of the battery cell, the smoothing plate 262 can maintain contact with the tab on the battery cell for smoothing, and will not crush the tab on the battery cell. It should be noted that the speed at which the first driving component 252 drives the tab smoothing component 26 to move away from the winding needle 32 at the first station b1 through the first transfer seat 251 is related to the speed at which the outer diameter of the battery cell increases, and can be set according to actual conditions, as long as it can ensure that the smoothing plate 262 maintains contact with the tab on the battery cell for smoothing, and will not crush the tab on the battery cell, and is not limited here.

Please refer to FIG. 8 and FIG. 9. In the embodiment of the present disclosure, the film-forming device 20 further includes a second motion mechanism 27, which includes a second transfer seat 271 and a second drive assembly (not marked in the drawings). The second film-forming roller 22 is rotatably connected to the second transfer seat 271, and the second transfer seat 271 is arranged at the driving end of the second drive assembly. The second drive assembly is used to drive the second transfer seat 271 to move, so as to drive the second film-forming roller 22 to approach or move away from the first film-forming roller 21. In this way, when it is necessary to insert the film, first, the first drive assembly 252 and the second drive assembly drive the first transfer seat 251 and the second transfer seat 271 to move respectively, so as to drive the first film-forming roller 21 and the second film-forming roller 22 to be spaced apart by a preset distance from each other. Then, the film-inserting device 10 sends the starting end of the cathode electrode sheet a2 between the first film-forming roller 21 and the second film-forming roller 22, and the starting end of the cathode electrode sheet a2 is located between the first diaphragm a1 and the second diaphragm a3. Then, the first drive assembly 252 and the second drive assembly respectively drive the first film roller 21 and the second film roller 22 to approach each other and abut against each other. At the same time, the first transfer seat 251 drives the movable roller 23 to press the layers of material strips passing through the pressing station, so that the layers of material strips are stretched and closely fit each other. At this time, the winding needle 32 located at the first station b1 rotates, thereby driving the layers of material strips to move downstream (under the friction force with the first diaphragm a1 and the second diaphragm a3, the starting end of the cathode electrode a2 follows the layers of material strips to move downstream) and is wound on the winding needle 32.

Optionally, the second drive assembly includes a second base 272, a second screw rod 274, a second drive member 275 and a second screw rod nut 276. The second base 272 is provided with a second linear rail 273, and the second transfer seat 271 is installed on the second base 272 through the second linear rail 273, so that the second linear rail 273 is used to guide the movement of the second transfer seat 271. The second screw rod 274 is rotatably connected to the second base 272, and the rotation axis of the second screw rod 274 is consistent with the extension direction of the second linear rail 273. The second drive member 275 is installed on the second base 272 and connected to the second screw rod 274, so that the second drive member 275 can drive the second screw rod 274 to rotate. The second screw nut 276 is threadedly connected to the second screw 274 and fixedly connected to the second transfer seat 271, so that when the second screw 274 rotates, the second screw nut 276 drives the second transfer seat 271 to move along the second linear rail 273, and then the second transfer seat 271 drives the second film roller 22 and the movable roller 23 to move together. Optionally, the second driving member 275 can be a motor.

Of course, the second drive assembly is not limited to a linear drive module using a screw pair. In other embodiments, other types of linear drive modules, such as electric cylinders, may also be used as long as they can drive the second transfer seat 271 to move to or away from the second film-joining position. This is not limited here.

In the embodiment of the present disclosure, the pressing assembly further includes a second blowing member 28. The second blowing member 28 is located on the side of each layer of the material strip passing through the pressing station away from the first blowing member 29, that is, the second blowing member 28 and the first blowing member 29 are respectively located on both sides of each layer of the material strip passing through the pressing station. The second blowing member 28 is used to blow air to each layer of the material strip passing through the pressing station, so that each layer of the material strip passing through the pressing station fits more tightly, further improving the accuracy of the detection result of the visual detector 24.

Optionally, the second blowing member 28 is a second blowing pipe, the length direction of which is consistent with the width direction of each layer of material strip. The second blowing pipe is provided with a plurality of second blowing ports, which are arranged at intervals along the length direction of the second blowing pipe, and each second blowing port is used to blow air to each layer of material strip passing through the pressing station, so that each layer of material strip can be subjected to air pressure in the entire width direction, so that each layer of material strip passing through the pressing station fits more tightly. Furthermore, a second air connection head is installed at the end of the second blowing pipe, and the second air connection head is connected to an external air source through an air supply pipe, so that the airflow provided by the external air source enters the second blowing pipe through the second air connection head, and is then blown out from each second air connection head on the second blowing pipe.

Specifically in the embodiment, the position and/or blowing angle of the second blowing member 28 can be adjusted, so as to adjust the blowing position and the air pressure applied to each layer of the material strip.

Optionally, the second motion mechanism 27 also includes a blowing drive 281 and a second mounting seat 282. The blowing drive 281 is mounted on the second base 272, the second mounting seat 282 is mounted on the driving end of the blowing drive 281, and the second blowing member 28 is mounted on the second mounting seat 282. The blowing drive 281 is used to drive the second mounting seat 282 to move, so that the second mounting seat 282 drives the second blowing member 28 to approach or move away from the layers of material strips passing through the pressing station. When it is necessary to blow air to the layers of material strips passing through the pressing station, the blowing drive 281 drives the second mounting seat 282 to drive the second blowing member 28 to move close to the layers of material strips passing through the pressing station, so that the second blowing member 28 can accurately blow air to the layers of material strips passing through the pressing station. When it is not necessary to blow air to the layers of material strips passing through the pressing station, the blowing drive 281 drives the second mounting seat 282 to drive the second blowing member 28 to move away from the layers of material strips passing through the pressing station to avoid other moving parts and the running of the material strips. Optionally, the blowing drive 281 can be a cylinder.

Furthermore, the second motion mechanism 27 also includes an adjustment seat 283, which is mounted on the second mounting seat 282, and the second blowing member 28 is mounted on the adjustment seat 283. The position of the adjustment seat 283 relative to the second mounting seat 282 is adjustable, thereby driving the second blowing member 28 to adjust its position, that is, adjusting the distance between the second blowing member 28 and each layer of material strip passing through the pressing station. Optionally, the second motion mechanism 27 also includes a second locking member. A second waist-shaped hole 284 is provided on the adjustment seat 283, and the second locking member is penetrated through the second waist-shaped hole 284 and is threadedly connected to the second mounting seat 282 to lock and fix the adjustment seat 283 on the second mounting seat 282. In this way, when it is necessary to adjust the position of the second blowing member 28, the second locking member is loosened so that the adjustment seat 283 can move relative to the second mounting seat 282, thereby driving the second blowing member 28 on the adjustment seat 283 to move. When the position of the second blowing member 28 is adjusted to the right position, the second locking member is tightened to re-lock and fix the adjustment seat 283 on the second mounting seat 282. Optionally, the second locking member can be a locking screw.

Further, the second blowing member 28 is rotatably connected to the adjustment seat 283, and the second blowing member 28 is locked and fixed to the adjustment seat 283 by a second fastener. In this way, when the blowing angle of the second blowing member 28 needs to be adjusted, the second fastener is loosened, and then the second blowing member 28 is rotatable relative to the adjustment seat 283 until the blowing angle of the second blowing member 28 is adjusted to the right position. When the blowing angle of the second blowing member 28 is adjusted to the right position, the second fastener is tightened to lock and fix the second blowing member 28 to the adjustment seat 283, so that the second blowing member 28 cannot rotate relative to the adjustment seat 283. Optionally, the second fastener can be a fastening screw.

It should be noted that the adjustment of the blowing angle and position of the second blowing member 28 is not limited to the above-mentioned method, and other more common adjustment structures can also be used. As long as the adjustment of the blowing angle and position of the second blowing member 28 can be achieved, it is not limited here.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims (20)

1. A membrane assembly device, characterized by comprising:

   A first film-forming roller (21);

   A second film-stitching roller (22), wherein a film-stitching channel is formed between the second film-stitching roller (22) and the first film-stitching roller (21), wherein the supply tape passes through the film-stitching channel and the starting end of the supply tape is inserted; at least one of the first film-stitching roller (21) and the second film-stitching roller (22) can be moved toward the other to bring each tape entering the film-stitching channel and the starting end of the tape together;

   A pressing assembly, the pressing assembly is used to apply pressure to each layer of material strip passing through the pressing station, so that the layers of material strip passing through the pressing station are attached to each other under the action of the pressure, and the pressing station is located downstream of the film-joining channel;

   A visual detector (24), wherein the visual detector (24) is used to perform visual inspection on the starting end of each layer of material strip passing through an inspection station, wherein the inspection station is located downstream of the pressing station or between the film-joining channel and the pressing station.
2. The membrane assembly device according to claim 1, characterized in that the pressing assembly comprises:

   A movable roller (23), wherein the movable roller (23) is arranged at the pressing station, and the movable roller (23) can be controlled to move close to each layer of material strip passing through the pressing station to tension each layer of material strip passing through the pressing station.
3. The film-joining device according to claim 2, characterized in that the film-joining device has a first state and a second state;

   When the film bonding device is in the first state, the first film bonding roller (21) and the second film bonding roller (22) are spaced apart by a preset distance so that the film bonding channel can be inserted with the starting end of the material strip, and the movable roller (23) and the second film bonding roller (22) bring the layers of the material strip together so that the brought together layers of the material strip can enter the slit on the winding needle located downstream of the pressing station;

   When the film-joining device is in the second state, the first film-joining roller (21) and the second film-joining roller (22) clamp the layers of material strips passing through the film-joining channel and the starting end of the material strips, and the movable roller (23) moves toward the layers of material strips passing through the pressing station to tension the layers of material strips passing through the pressing station.
4. The membrane assembly device according to claim 2 or 3, characterized in that the membrane assembly device further comprises:

   The first motion mechanism (25) comprises a first transfer seat (251) and a first driving assembly (252); the first film-forming roller (21) and the movable roller (23) are both rotatably connected to the first transfer seat (251), and the first transfer seat (251) is arranged at the driving end of the first driving assembly (252), so that the first driving assembly (252) can drive the first transfer seat (251) to move, so as to drive the first film-forming roller (21) to move closer to or away from the second film-forming roller (22), and drive the movable roller (23) to move closer to or away from each layer of material strip passing through the pressing station.
5. The membrane assembly device according to claim 4, characterized in that the membrane assembly device further comprises:

   a tab smoothing assembly (26), wherein the tab smoothing assembly (26) is mounted on the first transfer seat (251),

   When the first transfer seat (251) drives the first film-forming roller (21) to move close to the second film-forming roller (22), the first transfer seat (251) drives the tab smoothing assembly (26) to move close to the battery cell on the winding needle located downstream of the pressing station, so that the tab smoothing assembly (26) can smooth the tabs of the battery cell.
6. The membrane assembly device according to claim 5, characterized in that the tab smoothing assembly (26) comprises:

   A smoothing driving member (261), wherein the smoothing driving member (261) is installed on the first transfer seat (251);

   A smoothing plate (262) is installed at the driving end of the smoothing driving member (261), so that the smoothing driving member (261) can drive the smoothing plate (262) to approach the pole ear of the battery cell until it contacts the pole ear of the battery cell and smoothes it.
7. The membrane assembly device according to claim 6, characterized in that the tab smoothing assembly (26) further comprises:

   A mounting block (263), wherein the mounting block (263) is connected to the driving end of the smoothing driving member (261), and the smoothing plate (262) is rotatably connected to the mounting block (263);

   An elastic member (264), the elastic member (264) abutting between the mounting block (263) and the smoothing plate (262), the elastic member (264) being used to provide elastic force to the smoothing plate (262), so that when the outer diameter of the battery cell gradually increases, the smoothing plate (262) can always maintain contact with the tab of the battery cell under the action of the elastic force.
8. The membrane assembly device according to claim 7, characterized in that the elastic member (264) is a torsion spring, and the tab smoothing assembly (26) further comprises:

   A rotating shaft (265), the caressing plate (262) is rotatably connected to the mounting block (263) via the rotating shaft (265), the torsion spring is sleeved on the rotating shaft (265), one force arm of the torsion spring abuts against the mounting block (263), the other force arm of the torsion spring abuts against the caressing plate (262), and the caressing plate (262) is kept in abutment with the pole ear of the battery cell under the elastic force provided by the torsion spring.
9. The membrane assembly device according to claim 1, characterized in that the membrane assembly device further comprises:

   The second motion mechanism (27) includes a second transfer seat (271) and a second driving assembly. The second film roller (22) is rotatably connected to the second transfer seat (271). The second transfer seat (271) is arranged at the driving end of the second driving assembly. The second driving assembly is used to drive the second transfer seat (271) to move so as to drive the second film roller (22) to approach or move away from the first film roller (21).
10. The membrane assembly device according to claim 1, characterized in that the pressing assembly comprises:

    The first blowing member (29) is used to blow air toward each layer of the material strip passing through the pressing station, so that the layers of the material strip passing through the pressing station are attached to each other.
11. The membrane assembly device according to claim 10, characterized in that the membrane assembly device further comprises:

    The first transfer seat (251) can approach and move away from the various layers of material strips passing through the pressing station. The first blowing member (29) is installed on the first transfer seat (251) so that the first blowing member (29) follows the first transfer seat (251) to approach or move away from the various layers of material strips passing through the pressing station.
12. The film bonding device according to claim 10 or 11 is characterized in that the first blowing part (29) is a first blowing pipe, the length direction of the first blowing pipe is consistent with the width direction of each layer of material strip, and a plurality of first blowing ports are opened on the first blowing pipe, and the plurality of first blowing ports are arranged at intervals along the length direction of the first blowing pipe, and the first blowing port is used to blow air to each layer of material strip passing through the pressing station.
13. The film-joining device according to claim 10 is characterized in that the blowing angle and/or position of the first blowing member (29) on each layer of the material strip is adjustable.
14. The membrane assembly device according to claim 13, characterized in that the membrane assembly device further comprises:

    A first mounting seat (291), wherein the first mounting seat (291) is provided with a first waist-shaped hole (292), and the first blowing member (29) is rotatably connected to the first mounting seat (291);

    A first locking member, the first locking member is passed through the first waist-shaped hole (292) and is threadedly connected to the first transfer seat (251), and the first locking member can lock and fix the first mounting seat (291) on the first transfer seat (251);

    A first fastener, wherein the first fastener is used to lock and fix the first blowing member (29) on the first mounting seat (291) so that the first blowing member (29) cannot rotate relative to the first mounting seat (291).
15. The membrane assembly device according to any one of claims 10 to 14, characterized in that the pressing assembly further comprises:

    A second blowing member (28), the second blowing member (28) is located on the side of each layer of material strip passing through the pressing station away from the first blowing member (29), and the second blowing member (28) is used to blow air to each layer of material strip passing through the pressing station.
16. The membrane assembly device according to claim 15, characterized in that the membrane assembly device further comprises:

    Air blowing drive member (281);

    A second mounting seat (282), the second mounting seat (282) being mounted on a driving end of the air blowing driving member (281) so as to drive the second mounting seat (282) to move through the air blowing driving member (281);

    An adjusting seat (283), wherein the adjusting seat (283) is mounted on the second mounting seat (282), the second blowing member (28) is mounted on the adjusting seat (283), and the blowing angle and/or position of the second blowing member (28) on each layer of the material strip can be adjusted.
17. The membrane assembly device according to claim 16, characterized in that a second waist-shaped hole (284) is provided on the adjustment seat (283), and the membrane assembly device further comprises:

    a second locking member, the second locking member being inserted into the second waist-shaped hole (284) and being threadedly connected to the second mounting seat (282), the second locking member being capable of locking and fixing the adjustment seat (283) on the second mounting seat (282);

    A second fastener, wherein the second blowing member (28) is rotatably connected to the adjusting seat (283), and the second fastener is used to lock and fix the second blowing member (28) on the adjusting seat (283) so that the second blowing member (28) cannot rotate relative to the adjusting seat (283).
18. The membrane assembling device according to any one of claims 1 to 17, characterized in that the membrane assembling device further comprises:

    A light source (241), wherein the light source (241) and the visual detector (24) are respectively located on both sides of each layer of the material strip passing through the detection station, and the light source (241) is used to illuminate each layer of the material strip passing through the detection station.
19. A winding device, characterized by comprising the film combining device according to any one of claims 1 to 18.
20. The winding device according to claim 19, characterized in that it also includes:

    A turret (31), wherein the turret (31) is equipped with at least two winding needles (32), wherein the winding needles (32) are used to wind each layer of material strip, and the turret (31) can rotate so that each winding needle (32) passes through a first station and a second station in sequence, wherein the first station is located downstream of the film-joining device;

    A cutter device (50), the cutter device (50) is arranged between the first workstation and the second workstation, and the cutter device (50) is used to cut the first diaphragm, the second diaphragm and the anode electrode sheet in each layer of the material strip passing through.