Continuous sheet feeding and winding mechanism

Abstract

The utility model provides a continuous sheet feeding and winding mechanism, and relates to the technical field of winding equipment, according to the winding mechanism, a combining device is arranged between an unwinding device and a winding device, and the winding device is used for the combining device and arranged on the downstream of the unwinding device; and the combination module is used for combining the head part of the cut positive pole piece with the first diaphragm to form a positive pole composite layer, combining the head part of the cut negative pole piece with the second diaphragm to form a negative pole composite layer, and combining the positive pole composite layer with the negative pole composite layer to form a combined composite layer. The continuous sheet feeding and winding mechanism provided by the utility model can realize high-speed continuous coil feeding above 600mm / s.

Description

Technical Field

[0001] The present application relates to the technical field of battery winding, and in particular to a continuous sheet feeding and winding mechanism. Background Art

[0002] One of the main structures of existing lithium-ion power battery core packs is the core winding structure. The battery core of this structure is usually produced by a winding process. Compared with the battery core pack of the stacked core structure, this process has higher production efficiency and better control of the tension of the pole piece and diaphragm. In the traditional winding process, when the pole piece is rolled and the pole piece and diaphragm are fed into the winding machine, it is usually necessary to slow down or stop the machine to feed the material in order to achieve the correction and alignment of the pole piece and diaphragm, but this is not conducive to improving the efficiency of the winding process. Therefore, in order to achieve continuous winding, the prior art proposes to combine the pole piece and the diaphragm before winding, but because the length of the pole piece and the diaphragm of the core winding is relatively long, the combination of the pole piece and the diaphragm is difficult and costly, and it is not conducive to the correction and alignment of the pole piece and the diaphragm, so it is difficult to be truly applicable to production. Summary of the invention

[0003] The purpose of the present application is to provide a continuous film feeding and winding mechanism which is capable of separating film feeding and winding and has high continuous film feeding speed and high winding efficiency.

[0004] The technical solutions provided by this application are as follows:

[0005] A continuous film feeding and winding mechanism comprises an unwinding device, wherein the unwinding device comprises a positive electrode unwinding and cutting device, a negative electrode unwinding and cutting device, a first diaphragm unwinding device and a second diaphragm unwinding device;

[0006] A combining device, disposed downstream of the unwinding device, for combining the head of the cut positive electrode sheet with the first separator to form a positive electrode composite layer, combining the head of the cut negative electrode sheet with the second separator to form a negative electrode composite layer, and combining the positive electrode composite layer with the negative electrode composite layer to form a combined composite layer;

[0007] A winding device, disposed downstream of the combining device, for cutting the separator and winding it to form a battery core;

[0008] The head portion is a portion close to the moving direction of the positive electrode sheet / negative electrode sheet when the positive electrode sheet / negative electrode sheet is combined with the first diaphragm / second diaphragm.

[0009] Further, in some embodiments of the present application, the combining device includes a first combining device, a second combining device and a second combining device, wherein the first combining device is used to combine the head of the cut positive electrode sheet with the first diaphragm to form a positive electrode composite layer; the second combining device is used to combine the head of the cut negative electrode sheet with the second diaphragm to form a negative electrode composite layer;

[0010] The third combining device is located downstream of the first combining device and is used to combine the positive electrode composite layer with the negative electrode composite layer to form a combined composite layer.

[0011] Furthermore, in some embodiments of the present application, the first bonding device and the second bonding device are both hot-press bonding devices or adhesive devices; the third bonding device is a hot-press bonding device or an electrostatic generator.

[0012] Furthermore, in some embodiments of the present application,

[0013] The first combining device comprises a first combining assembly, a first driver and a first meter; the first combining assembly comprises a second combining member and a first combining member, a gap for the positive electrode sheet and the first diaphragm to pass through is provided between the second combining member and the first combining member; the first driver is connected to the first combining member and drives the first combining member to contact / move away from the first diaphragm, and the gap between the first combining member and the second combining member is not greater than the sum of the thicknesses of the positive electrode sheet and the first diaphragm; the first meter is used to collect the time when the first combining assembly contacts / move away from the first diaphragm;

[0014] The second combining device includes a second combining assembly, a third driver, and a second meter; the second combining assembly includes a fourth combining member and a third combining member, and a gap for the negative electrode sheet and the second diaphragm to pass through is provided between the fourth combining member and the third combining member; the third driver is connected to the third combining member and drives the third combining member to contact / move away from the second diaphragm, and the gap between the third combining member and the fourth combining member is not greater than the sum of the thicknesses of the negative electrode sheet and the second diaphragm; the second meter is used to collect the time when the second combining assembly contacts / move away from the second diaphragm;

[0015] The third combining device includes a fifth combining member, a sixth combining member, a fifth driver, a sixth driver and a third meter. A gap through which the positive electrode composite layer and the negative electrode composite layer pass is provided between the fifth combining member and the sixth combining member. The fifth driver is connected to the fifth combining member and drives the fifth combining member to contact / move away from the first diaphragm / the positive electrode plate and / or the sixth driver is connected to the sixth combining member and drives the sixth combining member to contact / move away from the second diaphragm, and makes the first diaphragm / the positive electrode plate contact with the second diaphragm. The third meter is used to collect the time when the fifth combining member contacts / moves away from the first diaphragm / the positive electrode plate or the sixth combining member contacts / moves away from the second diaphragm.

[0016] Further, in some embodiments of the present application, the first combining device includes a first heating component, which is disposed on the first combining component and is used to heat the first combining component;

[0017] The second bonding device comprises a second heating component, which is arranged on the second bonding component and is used for heating the second bonding component;

[0018] The third combining device comprises a third heating assembly and a fourth heating assembly, and the third heating assembly and the fourth heating assembly are respectively arranged on the fifth combining piece and the sixth combining piece and are used for heating the fifth combining piece and the sixth combining piece.

[0019] Further, in some embodiments of the present application, the first combining device further comprises a seventh driver, the seventh driver drives the first combining component to move toward the moving direction of the positive electrode sheet, and the moving speed of the first combining component is equal to the moving speed of the positive electrode sheet;

[0020] The second combining device further comprises an eighth driver, wherein the eighth driver drives the second combining assembly to move toward the moving direction of the negative electrode sheet, and the moving speed of the second combining assembly is equal to the moving speed of the negative electrode sheet;

[0021] The third combining device includes a ninth driver, and the ninth driver drives the fifth combining member and the sixth combining member to move in the moving direction of the combined composite layer, and the moving speed of the fifth combining member and the sixth combining member is equal to the moving speed of the combined composite layer.

[0022] Furthermore, in some embodiments of the present application, a controller is also included, and the controller is communicatively connected with the first combining device, the second combining device and the third combining device.

[0023] Further, in some embodiments of the present application, the positive electrode unwinding and cutting device comprises a positive electrode unwinding assembly, a first buffer assembly, a first pinching sheet assembly and a first cutting assembly which are arranged in sequence; the positive electrode unwinding assembly unwinds the positive electrode sheet to the first cutting assembly, and the first cutting assembly cuts the positive electrode sheet to form a cut positive electrode sheet; the first buffer assembly is located between the positive electrode unwinding assembly and the first cutting assembly, and is used to increase the distance between two adjacent cut positive electrode sheets; the first pinching sheet assembly is located between the first buffer assembly and the first cutting assembly, and is used to pinch and feed the positive electrode sheet to the first cutting assembly;

[0024] The negative electrode unwinding and cutting device includes a negative electrode unwinding assembly, a second buffer assembly, a second clamping sheet assembly and a second cutting assembly; the negative electrode unwinding assembly unwinds the negative electrode sheet to the second cutting assembly, and the second cutting assembly cuts the negative electrode sheet to form a cut negative electrode sheet; the second buffer assembly is located between the negative electrode unwinding assembly and the second cutting assembly, and is used to increase the distance between two adjacent cut negative electrode sheets; the second clamping sheet assembly is located between the second buffer assembly and the second cutting assembly, and is used to clamp the negative electrode sheet to the second cutting assembly.

[0025] Furthermore, in some embodiments of the present application, a first deviation-correcting component is further provided between the first buffer component and the first cutting component;

[0026] A second deviation correcting component is also arranged between the second buffer component and the second cutting component.

[0027] Further, in some embodiments of the present application, the first combining component is a roller or a plate.

[0028] Beneficial effects of this application:

[0029] The present application provides a continuous sheet feeding and winding mechanism, in which a combining device is arranged between an unwinding and cutting device and a winding device, and the combining device is used to combine a positive electrode sheet with a first diaphragm, and a negative electrode sheet with a second diaphragm, and then combine the first diaphragm and the second diaphragm in the positive electrode composite layer and the negative electrode combining layer, so that the positive electrode sheet and the negative electrode sheet can be fed in the winding process along with the first diaphragm and the second diaphragm, thereby realizing the simultaneous and uniform feeding of the negative electrode sheet, the positive electrode sheet, the first diaphragm and the second diaphragm, without the need to reduce the speed, start and stop, and adjust the feeding speed of the negative electrode sheet, the positive electrode sheet, the first diaphragm and the second diaphragm, thereby realizing continuous, uniform and high-speed feeding; in addition, since the head of the positive electrode sheet is combined with the first diaphragm, and the head of the negative electrode sheet is combined with the second diaphragm, not only can the positive electrode sheet and the negative electrode sheet be avoided from being cut off during feeding, winding and flying cutting, but also the positive electrode sheet and the negative electrode sheet can be avoided from being cut off during feeding, winding and flying cutting, etc. The defects of the heads of the positive and negative pole sheets being suspended in the air after head shaking, tail shaking and flying cutting occur during the process; the free ends of the tails of the positive and negative pole sheets can be kept as free ends, so as to realize the deviation correction of the positive and negative pole sheets and adjust the tension during the winding process, thereby reducing the tension unevenness and wrinkles; in addition, since only the head of the positive pole sheet is combined with the first diaphragm and only the head of the negative pole sheet is combined with the second diaphragm, the time and cost required for the combination of the positive pole sheet and the first diaphragm, the time and cost required for the combination of the negative pole sheet and the second diaphragm can be reduced, thereby reducing the difficulty of combining the pole sheet and the diaphragm, and it can also increase the winding speed of the battery cell, so that it can realize continuous winding at a feeding speed of more than 600 mm / s, and even realize continuous winding at a feeding speed of more than 2000 mm / s. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a continuous film feeding and winding process provided in some embodiments of the present application;

[0031] Figure 2 for Figure 1 A partial enlarged view of

[0032] Figure 3 A schematic structural diagram of a combined device for a continuous film feeding and winding process provided in some embodiments of the present application;

[0033] Among them, A-first spacing, B-second spacing, C-overlapping area, 1-positive electrode unwinding assembly, 2-first buffer assembly, 3-first deviation correction assembly, 4-first pinching sheet assembly, 5-first cutting assembly, 6-first combining device, 61-positive electrode sheet, 62-negative electrode sheet, 611-first combining roller, 612-first rotating motor, 613-first driver, 614-first screw assembly, 621-second combining roller, 622-second rotating motor, 623- The second driver, 624-the second screw assembly, 7-the first diaphragm unwinding device, 71-the first diaphragm, 72-the second diaphragm, 8-the negative electrode unwinding assembly, 9-the second buffer assembly, 10-the second deviation correction assembly, 11-the second diaphragm unwinding device, 12-the second clamping sheet assembly, 13-the second cutting assembly, 14-the second combining device, 15-the first electrostatic generator, 16-the second electrostatic generator, 17-the third combining device, 18-the winding device, 19-the flying cutting device. DETAILED DESCRIPTION

[0034] In order to better explain the present application, the implementation methods of the present application are described in detail with reference to the present application, and the main content of the present application is further clarified in conjunction with specific examples, but the content of the present application is not limited to the following examples.

[0035] In the description of this application, it should be understood that the terms "thickness", "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. In addition, the term "plurality" means two or more, unless otherwise clearly and specifically defined.

[0036] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0037] Example

[0038] This embodiment provides a continuous film feeding and winding mechanism. Figure 1 to Figure 3 , including an unwinding device, a combining device and a winding device 18;

[0039] The unwinding device includes a positive electrode unwinding and cutting device, a negative electrode unwinding and cutting device, a first diaphragm unwinding device and a second diaphragm unwinding device; the positive electrode unwinding and cutting device is used to unwind the positive electrode sheet and cut the positive electrode sheet into a positive electrode sheet of a desired length; the negative electrode unwinding and cutting device is used to unwind the negative electrode sheet and cut the negative electrode sheet into a negative electrode sheet of a desired length; the first diaphragm unwinding device is used to unwind the first diaphragm, and the second diaphragm unwinding device is used to unwind the second diaphragm;

[0040] Among them, the positive electrode unwinding and cutting device can be the following structure: it includes a positive electrode unwinding component 1, a first buffer component 2, a first clamping sheet component 4 and a first cutting component 5 arranged in sequence; the positive electrode unwinding component unwinds the positive electrode sheet to the first cutting component, and the first cutting component cuts the positive electrode sheet to form a cut positive electrode sheet; the first buffer component is located between the positive electrode unwinding component and the first cutting component, and is used to pull the distance between two adjacent cut positive electrode sheets; the first clamping sheet component is located between the first buffer component and the first cutting component, and is used to clamp the positive electrode sheet to the first cutting component.

[0041] Preferably, a first deflection correction component is provided between the first buffer component and the first cutting component for correcting the positive electrode sheet; and a second deflection correction component is provided between the second buffer component and the second cutting component for correcting the negative electrode sheet.

[0042] The negative electrode unwinding and cutting device can be of the following structure: the negative electrode unwinding and cutting device includes a negative electrode unwinding component 8, a second buffer component 9, a second clamping sheet component 12 and a second cutting component 13; the negative electrode unwinding component unwinds the negative electrode sheet to the second cutting component, and the second cutting component cuts the negative electrode sheet to form a cut negative electrode sheet; the second buffer component is located between the negative electrode unwinding component and the second cutting component, and is used to pull the distance between two adjacent cut negative electrode sheets; the second clamping sheet component is located between the second buffer component and the second cutting component, and is used to clamp the negative electrode sheet to the second cutting component. The positive electrode unwinding component, the first buffer component, the first clamping sheet component, the first cutting component, the negative electrode unwinding component, the second buffer component, the second clamping sheet component, the second cutting component, the first diaphragm unwinding device 7, the second diaphragm unwinding device 11, the first deviation correction component 3, and the second deviation correction component 10 are all prior art, and their specific structures will not be described in detail in this application.

[0043] The combining device is arranged downstream of the unwinding device, and the positive electrode sheet and the negative electrode sheet are fed into the combining device after being cut, and the first diaphragm and the second diaphragm are also fed into the combining device by the first diaphragm unwinding device and the second diaphragm unwinding device, so that the head of the cut positive electrode sheet is combined with the first diaphragm to form a positive electrode composite layer, and the head of the cut negative electrode sheet is combined with the second diaphragm to form a negative electrode composite layer; and then the positive electrode composite layer and the negative electrode composite layer are combined to form a combined composite layer;

[0044] Specifically, the combining device includes a first combining device 6, a second combining device 14 and a third combining device 17. The first combining device is used to combine the head of the cut positive electrode sheet with the first diaphragm to form a positive electrode composite layer; the second combining device is used to combine the head of the cut negative electrode sheet with the second diaphragm to form a negative electrode composite layer; the third combining device is located downstream of the first combining device, and is used to combine the positive electrode composite layer with the negative electrode composite layer to form a combined composite layer.

[0045] Among them, the first combining device 6 includes a first combining roller group, a first driver 613, a second driver 623 and a first meter; the first combining roller group includes a first combining roller and a second combining roller, and a spacing for the positive electrode sheet 61 and the first diaphragm 71 to pass through is set between the second combining roller and the first combining roller; the first driver is connected to the first combining roller and drives the first combining roller to contact / move away from the first diaphragm, and the second driver is connected to the second combining roller and drives the second combining roller to contact / move away from the first diaphragm, and the spacing between the first combining roller and the second combining roller is not greater than the sum of the thicknesses of the positive electrode sheet and the first diaphragm; the first meter is used to collect the time when the first combining roller group contacts / moves away from the first diaphragm; it should also be noted that the first combining roller 611 and the second combining roller 621 are also respectively provided with a first rotating motor 612 and a second rotating motor 622 for driving the first combining roller and the second combining roller to rotate respectively. In some examples, the first driver 613 drives the first combining roller 611 to reciprocate through the first screw assembly 614 ; similarly, the second driver 623 drives the second combining roller 621 to reciprocate through the second screw assembly 624 .

[0046] The second combining device comprises a second combining roller group, a third driver, a fourth driver and a second meter; the second combining roller group comprises a fourth combining roller and a third combining roller, and a gap for the negative electrode sheet and the second diaphragm to pass through is provided between the fourth combining roller and the third combining roller; the third driver is connected to the third combining roller and drives the third combining roller to contact / stay away from the second diaphragm, the fourth driver is connected to the fourth combining roller and drives the fourth combining roller to contact / stay away from the second diaphragm, and the gap between the third combining roller and the fourth combining roller is not greater than the sum of the thicknesses of the negative electrode sheet and the second diaphragm; the second meter is used to collect the time when the second combining roller group contacts / stays away from the second diaphragm;

[0047] The third combining device includes a fifth combining roller, a sixth combining roller, a fifth driver, a sixth driver and a third meter. A gap is provided between the fifth combining roller and the sixth combining roller for the positive electrode composite layer and the negative electrode composite layer to pass through. The fifth driver is connected to the third combining roller, the sixth driver and the sixth combining roller and drives the fifth combining roller to contact / move away from the first diaphragm / the positive electrode sheet, drives the sixth combining roller to contact / move away from the second diaphragm, and makes the first diaphragm / the positive electrode sheet contact with the second diaphragm. The third meter is used to collect the time when the fifth combining roller contacts / moves away from the first diaphragm / the positive electrode sheet or the sixth combining roller contacts / moves away from the second diaphragm.

[0048] Similarly, the third combining roller, the fourth combining roller, the fifth combining roller and the sixth combining roller are respectively provided with a rotating motor for driving the rotation thereof. Since the rotation of the driving roller is a prior art in the art, it will not be described in detail one by one in this application. Similarly, the reciprocating movement of the third combining roller, the fourth combining roller, the fifth combining roller and the sixth combining roller can also be connected to their corresponding drivers through a screw assembly, and the third combining roller, the fourth combining roller, the fifth combining roller and the sixth combining roller can be driven to reciprocate along their corresponding screws by the driver. The movement of the driver driving device along the screw assembly is a prior art in the art, so it will not be described in detail one by one in this application.

[0049] At least the first bonding roller, the third bonding roller, the fifth bonding roller, and the sixth bonding roller are high-resistance conductors or heat-conducting materials, which can generate heat when powered on or be connected to a high-temperature heat source to make their temperature higher. When the first bonding roller contacts the first diaphragm, the temperature of the first diaphragm can be increased, and at the same time, the first driver drives the head of the positive electrode sheet to be pressed against the first diaphragm, thereby achieving hot-pressing bonding between the head of the positive electrode sheet and the first diaphragm; since the positive electrode sheet and the first diaphragm are moving at a uniform speed at the same time during this process, the relative positions of the two do not change. When the hot-pressing bonding length of the positive electrode sheet and the first diaphragm reaches the required length, the first driver drives the first bonding roller away from the first diaphragm, the first diaphragm is no longer heated, and the first bonding roller no longer hot-presses the positive electrode sheet and the first diaphragm, so that the positive electrode sheet and the first diaphragm are not bonded, and the positive electrode sheet and the first diaphragm are partially bonded. Since the first diaphragm and the positive electrode sheet are both in a state of uniform speed during this process, the time of the first bonding roller moving to heat-press the first diaphragm and the positive electrode sheet is collected by the first meter, and the time difference between the first driver driving the first bonding roller to approach the first diaphragm and move away from the first diaphragm can be controlled to achieve the control of the bonding length of the positive electrode sheet and the first diaphragm of a certain length. At the same time, since the speed of the first diaphragm and the positive electrode sheet during the bonding process is uniform, and the spacing between two adjacent positive electrode sheets is controllable, the time length of each positive electrode sheet passing through the second bonding roller is approximately constant, so the time interval between the first driver driving the first bonding roller to contact the first diaphragm twice can be controlled to achieve the control of the bonding position of the next positive electrode sheet and the first diaphragm to be the head of the positive electrode sheet. Among them, the head is the part close to the moving direction of the positive electrode sheet / negative electrode sheet when the positive electrode sheet / negative electrode sheet is bonded to the first diaphragm / second diaphragm, and its length does not exceed 1.5 times the outer circumference of the formed battery cell, and preferably does not exceed the width of the formed battery cell. Preferably, the first combining device further comprises an image acquisition device, which is used to acquire the position of the positive electrode sheet and provide information for controlling the first driver to drive the first moving roller to move. The image acquisition device may be a CCD camera, and the first driver may be an existing driver such as a motor, an air pump, or a liquid pump.

[0050] Similarly, when the third bonding roller contacts the second diaphragm, the temperature of the second diaphragm can be increased, and at the same time, the second driver drives the head of the negative electrode sheet to be pressed against the second diaphragm, thereby realizing the hot pressing bonding of the head of the negative electrode sheet and the second diaphragm; since the negative electrode sheet and the second diaphragm are both moving at a uniform speed at the same time during this process, the relative positions of the two do not change. When the hot pressing bonding length of the negative electrode sheet and the second diaphragm reaches the required length, the third driver drives the third bonding roller away from the second diaphragm, the second diaphragm is no longer heated, and the third bonding roller no longer hot presses the negative electrode sheet and the second diaphragm, so that the negative electrode sheet and the second diaphragm are not bonded, and the negative electrode sheet and the second diaphragm can be partially bonded. Since in this process, the second diaphragm and the negative electrode sheet are both in a state of uniform speed, the time of the third bonding roller moving to hot press the second diaphragm and the negative electrode sheet is collected by the second meter, and the time difference between the third driver driving the third bonding roller to approach the second diaphragm and to move away from the second diaphragm can be controlled to realize the control of the bonding length of the negative electrode sheet and the second diaphragm of a certain length. At the same time, since the speed of the second diaphragm and the negative electrode sheet is uniform during the bonding process and the distance between two adjacent negative electrode sheets is controllable, the time length that each negative electrode sheet passes through the fourth bonding roller is approximately constant. Therefore, by controlling the time interval between the second driver driving the third bonding roller to contact the second diaphragm twice, the bonding position of the next negative electrode sheet and the second diaphragm can be controlled to be the head of the negative electrode sheet.

[0051] Preferably, the second combining device further comprises an image acquisition device, which is used to acquire the position of the negative electrode sheet and provide information for controlling the third driver to drive the third combining roller and / or the fourth driver to drive the fourth combining roller to move. The image acquisition device may be a CCD camera, and the third driver may be an existing driver such as a motor, an air pump, or a liquid pump.

[0052] Similarly, when the fifth bonding roller contacts the first diaphragm and the sixth bonding roller contacts the second diaphragm, the temperature of the first diaphragm and the second diaphragm can be increased, and at the same time, the fifth driver drives the fifth bonding roller and the sixth bonding roller to approach each other, so that the first diaphragm and the second diaphragm are pressed against each other, thereby achieving hot pressing bonding of the first diaphragm and the second diaphragm; since the first diaphragm and the second diaphragm are moving at a uniform speed at the same time during this process, the relative positions of the two do not change. When the hot pressing bonding length of the first diaphragm and the second diaphragm reaches the required length, the fifth driver and the sixth driver simultaneously drive the fifth bonding roller and the sixth bonding roller away from the first diaphragm and the second diaphragm, respectively, and the first diaphragm and the second diaphragm are no longer heated, and the fifth bonding roller and the sixth bonding roller no longer hot press the first diaphragm and the second diaphragm, so that the first diaphragm and the second diaphragm are not bonded, and the first diaphragm and the second diaphragm can be partially bonded. Since the first diaphragm and the second diaphragm are both in a state of uniform speed during this process, the time of the fifth and sixth bonding rollers moving to heat press the first and second diaphragms is collected by the third meter, and the time difference between the fifth driver driving the fifth bonding roller to approach the first diaphragm and away from the first diaphragm and the time difference between the sixth driver driving the sixth bonding roller to approach the first diaphragm and away from the first diaphragm can be controlled to achieve the control of the bonding length of the first and second diaphragms of a certain length. At the same time, since the speed of the first and second diaphragms during the bonding process is uniform, and the spacing between two adjacent negative and positive electrode sheets is controllable, the time length of each negative electrode sheet passing through the gap between the fifth and sixth bonding rollers is approximately constant. Therefore, the time interval between the fifth and sixth drivers driving the fifth and sixth bonding rollers to contact the first and second diaphragms twice can be controlled to achieve the position control that the bonding position of the next first diaphragm and the second diaphragm is between two adjacent positive and negative electrode sheets.

[0053] Preferably, the third combining device further comprises an image acquisition device, which is used to acquire positions where the first diaphragm and the second diaphragm are not combined with the positive electrode sheet and the negative electrode sheet, and provide information for controlling the fifth driver and the sixth driver to drive the fifth combining roller and the sixth combining roller to move respectively. The image acquisition device may be a CCD camera, and the fifth driver and the sixth driver may be existing drivers such as motors, air pumps, and liquid pumps. The winding device is arranged downstream of the combining device, and is used to cut the diaphragm and wind it to form a battery cell; the winding device includes: a continuous diaphragm winding head and a flying cutting device 19; the continuous diaphragm winding head device includes 3 winding heads, and can realize direct switching of the three winding heads; when the winding head is switched, the guide path is the surface of the winding head, and there is no need to enter the center of the winding needle. At the same time, under the condition of uniform guide speed, the flying cutting device can fly the diaphragm on the winding surface (when the diaphragm section between the battery cells passes through the winding needle surface) at a uniform speed online, and adsorb the head of the inner diaphragm. The outer diaphragm is combined with the inner diaphragm due to the previous combining process part, forming a composite diaphragm section, realizing the separation between the battery cells at high speed when switching the battery cells and starting the winding of the next battery cell. The winding device can adopt the winding head assembly disclosed in CN115000529A, but compared with the winding head assembly disclosed in the patent, the winding device adopted in this application can omit the film laminating mechanism. Therefore, the specific structure of the winding device will not be described in detail in this application.

[0054] In other embodiments, at least the first bonding roller, the third bonding roller, the fifth bonding roller and / or the sixth bonding roller may also be provided with heating components, such as the first bonding roller is provided with a first heating component, the third bonding roller is provided with a second heating component, the fifth bonding roller is provided with a third heating component and / or the sixth bonding roller is provided with a fourth heating component, for heating the corresponding bonding parts. It should be noted that the fifth bonding roller and the sixth bonding roller may both be provided with heating components, or only one heating component may be provided. Preferably, the fifth bonding roller and the sixth bonding roller are both provided with heating components, so that the tension, damping, inertia, dynamic and static friction of the first diaphragm and the second diaphragm are as close to equal as possible during the bonding process, thereby improving the quality and stability of the winding core.

[0055] The heating component may be an existing heating component, such as a flexible heating sheet or an array of heating wires connected to an external power source. The first bonding roller, the third bonding roller, the fifth bonding roller and the sixth bonding roller may be existing hot pressing rollers that can be heated at a fixed time.

[0056] In some embodiments, the third combining device may also be an electrostatic combining device. When the third combining device is an electrostatic combining device, the third combining device includes: a fifth combining roller, a sixth combining roller, a fifth driver, a sixth driver, a third meter, a first electrostatic generator 15 and a second electrostatic generator 16; the first electrostatic generator and the second electrostatic generator are located upstream of the fifth combining roller and the sixth combining roller, and are used to make the first diaphragm and the second diaphragm carry charges of different electrical properties; a gap is provided between the fifth combining roller and the sixth combining roller for the positive electrode composite layer and the negative electrode composite layer to pass through; the fifth driver is connected to the fifth combining roller, and the sixth driver is connected to the sixth combining roller, and drives the fifth combining roller to contact / move away from the first diaphragm / the positive electrode sheet, drives the sixth combining roller to contact / move away from the second diaphragm, and makes the first diaphragm / the positive electrode sheet contact with the second diaphragm, and the third meter is used to collect the time when the fifth combining roller contacts / moves away from the first diaphragm / positive electrode sheet or the sixth combining roller contacts / moves away from the second diaphragm.

[0057] Among them, the first electrostatic generator and the second electrostatic generator are both existing electrostatic generators, so they will not be described in detail in this application.

[0058] In some other embodiments, the first combining assembly in the first combining device may be a first fixed plate and a first movable plate, the first combining device includes a first driver and a seventh driver, a gap for the positive electrode sheet and the first diaphragm to pass through is provided between the first fixed plate and the first movable plate; the first driver is connected to the first movable plate and drives the first movable plate to contact / move away from the first diaphragm, and the gap between the first movable plate and the first fixed plate is not greater than the sum of the thicknesses of the positive electrode sheet and the first diaphragm; the first meter is used to collect the time when the first combining plate group contacts / moves away from the first diaphragm The seventh driver drives the first combining component to move toward the moving direction of the positive electrode sheet, and the moving speed of the first combining component is equal to the moving speed of the positive electrode sheet; the first movable plate is a heating element that can be heated or a heating component is arranged on the first movable plate, and in the process of the first diaphragm and the positive electrode sheet moving forward, the first movable plate and the first fixed plate are pressed on the first diaphragm and the positive electrode sheet and keep the relative positions unchanged for a certain period of time, and the first diaphragm and the positive electrode sheet are hot-pressed and combined by heating, so that the combination length and combination area of ​​the first diaphragm and the positive electrode sheet can be controlled more accurately and the combination strength is better.

[0059] Similarly, the second combining assembly in the second combining device may be a second fixed plate and a second movable plate, the second combining device includes a second driver and an eighth driver, a gap for the negative electrode sheet and the second diaphragm to pass through is provided between the second fixed plate and the second movable plate; the second driver is connected to the second movable plate and drives the second movable plate to contact / move away from the second diaphragm, and the gap between the second movable plate and the second fixed plate is not greater than the sum of the thicknesses of the negative electrode sheet and the second diaphragm; the second meter is used to collect the time when the second combining plate group contacts / moves away from the second diaphragm; The eighth driver drives the second combining component to move toward the movement direction of the negative electrode plate, and the movement speed of the second combining component is equal to the movement speed of the negative electrode plate; the second movable plate is a heating element that can be heated or a heating component is arranged on the second movable plate, and during the forward movement of the second diaphragm and the negative electrode plate, the second movable plate and the second fixed plate are pressed on the second diaphragm and the negative electrode plate and keep the relative positions unchanged for a certain period of time, and the second diaphragm and the negative electrode plate are hot-pressed and combined by heating, so that the combination length and combination area of ​​the second diaphragm and the negative electrode plate can be controlled more accurately and the combination strength is better.

[0060] Similarly, the third combining device includes a ninth driver and a tenth driver, and a gap for the first diaphragm and the second diaphragm to pass through is set between the third combining plate and the fourth combining plate; the ninth driver is connected to the third combining plate and the fourth combining plate and drives the third combining plate and the fourth combining plate to contact / move away from the first diaphragm and the second diaphragm, and makes the gap between the fourth combining plate and the third combining plate not greater than the sum of the thicknesses of the first diaphragm and the second diaphragm; the third meter is used to collect the time when the third combining plate group contacts / moves away from the second diaphragm; the tenth driver drives the third combining plate and the fourth combining plate to move in the movement direction of the combined composite layer, and the movement speed of the third combining plate and the fourth combining plate is equal to the movement speed of the combined composite layer. The third combining plate and the fourth combining plate can both be heating elements that can be heated, or the third combining plate and the fourth combining plate are provided with heating components. During the forward movement of the second diaphragm and the first diaphragm, the fourth combining plate and the third combining plate are pressed on the second diaphragm and the first diaphragm and keep their relative positions unchanged for a certain period of time, and the second diaphragm and the first diaphragm are hot-pressed and combined by heating, so that the combination length and combination area of ​​the second diaphragm and the first diaphragm can be controlled more accurately and the combination strength is better.

[0061] In some embodiments, a controller is further included, and the controller is connected to the first combination device, the second combination device, and the third combination device in a communication connection mode, and the communication connection mode can be a wireless communication connection or an electrical connection. The controller can be any control unit in the prior art that can realize information collection, data processing, judgment, and instruction sending, such as a single-chip microcomputer.

[0062] In some embodiments, a third deviation correction device is further provided upstream of the winding device and downstream of the combining device, and the third deviation correction device is used for simultaneously correcting the positive electrode sheet and the negative electrode sheet, so that the structural layers formed by stacking the positive electrode sheet, the first separator, the negative electrode sheet and the second separator are aligned. The third deviation correction device is a prior art, and its specific structure will not be described in detail.

[0063] The continuous film feeding and winding mechanism provided in this embodiment works as follows:

[0064] The positive electrode unwinding and cutting device continuously unwinds the positive electrode sheet and cuts the positive electrode sheet to the required length of the battery cell; in the process of cutting the positive electrode sheet, the first buffer component located between the positive electrode unwinding component and the first cutting component pulls the distance between the cut positive electrode sheet and the uncut positive electrode sheet through the buffer roller group, and this distance is the first distance A; at the same time, the negative electrode unwinding and cutting device continuously unwinds the positive electrode sheet and cuts the negative electrode sheet to the required length of the battery cell, and in the process of cutting the negative electrode sheet, the second buffer component located between the negative electrode unwinding component and the second cutting component pulls the distance between the cut negative electrode sheet and the uncut negative electrode sheet through the buffer roller group, and this distance is the second distance B; there is an overlapping area C in the projections of the first distance A and the second distance B in the direction perpendicular to the first diaphragm / the second diaphragm; the subsequent positive electrode composite layer and the negative electrode composite layer are partially combined in the overlapping area.

[0065] It should be noted that the overlapped area C of the projections of the first spacing A and the second spacing B in the direction perpendicular to the first diaphragm / the second diaphragm is as follows: Figure 2 As shown, in the present application, the bonding area of ​​the positive electrode composite layer and the negative electrode composite layer includes a partially overlapping area, which should be understood as: the projection of the bonding area of ​​the positive electrode composite layer and the negative electrode composite layer in the direction perpendicular to the first diaphragm / the second diaphragm partially overlaps with the projection of the first spacing A and the second spacing B in the direction perpendicular to the first diaphragm / the second diaphragm.

[0066] At the same time, the first diaphragm unwinding device and the second diaphragm unwinding device unwind the first diaphragm and the second diaphragm respectively, and the head of the positive electrode sheet is combined with the first diaphragm through the first combining device to form a first composite section, and the first composite section is used as a traction point so that the positive electrode composite layer formed by the positive electrode sheet 61 and the first diaphragm 71 can be synchronously pulled; the head of the negative electrode sheet 62 is combined with the second diaphragm 72 through the second combining device to form a second composite section, and the second composite section is used as a traction point so that the negative electrode composite layer formed by the negative electrode sheet 62 and the second diaphragm 72 can be synchronously pulled, and then Driven by the membrane 71 and the second diaphragm 72, the positive electrode sheet 61 and the negative electrode sheet 62 move forward synchronously and uniformly in parallel and enter the third combining device, and then the first diaphragm 71 and the second diaphragm 72 are combined under the action of the third combining device, so that the heads of the positive electrode combination composite layer and the negative electrode combination composite layer are combined together, while the tails still keep free ends, providing freedom for subsequent correction; the combined positive electrode combination composite layer and the negative electrode combination composite layer are synchronously sent to the winding device after correction, and are wound and cut at the position where the first diaphragm and the second diaphragm are combined to separate the front and rear battery cells. Since the first diaphragm and the second diaphragm are directly combined together, and the subsequent fly-cutting position is the position where the first diaphragm and the second diaphragm are combined, it is not necessary to cut the positive electrode sheet and the negative electrode sheet during the fly-cutting process, thereby avoiding the powder scattering caused by the fly-cutting of the positive electrode sheet and the negative electrode sheet; at the same time, since the first diaphragm and the second diaphragm are originally combined together, and the positive electrode sheet and the first diaphragm, the negative electrode sheet and the second diaphragm are also combined together, there will be no misalignment of the layers during the fly-cutting process, and there will be no misalignment of the positive electrode sheet and the negative electrode sheet. At the same time, since each layer of the structure (positive electrode sheet, first diaphragm, negative electrode sheet, second diaphragm) is already combined together before entering the winding device, the feeding speed of each layer can be kept almost absolutely consistent, and the spacing between the positive electrode sheets and the negative electrode sheets has been adjusted, so there is no need to slow down or stop the speed to adjust the position and speed difference between the positive electrode sheet and the first diaphragm, the negative electrode sheet and the second diaphragm, and the positive electrode sheet and the negative electrode sheet, which truly realizes continuous and uniform feeding into the winding device for winding and flying cutting. In addition, since in the present application, the positive electrode sheet and the first diaphragm, the negative electrode sheet and the second diaphragm are only combined at the head, the time required for the combination process is relatively short, and the non-stop combination can be achieved in a smaller field when the positive electrode sheet and the first diaphragm, the negative electrode sheet and the second diaphragm are advancing at high speed, and there is no need to slow down or stop the speed to provide time and space for the combination, thereby increasing the sheet feeding rate. Moreover, since the positive electrode sheet and the first separator, the negative electrode sheet and the second separator are only combined at the head, and the middle and tail are not combined, the tension difference caused by the different inner and outer sides of the winding process can be partially released, reducing the occurrence of wrinkles and improving the quality of the battery cell.

[0067] During the process of combining, winding, and cutting between the previous positive electrode sheet and the first diaphragm, the negative electrode sheet and the second diaphragm, and the first diaphragm and the second diaphragm, the first clamping sheet assembly and the second clamping sheet assembly in the positive electrode unwinding and cutting device and the negative electrode unwinding and cutting device respectively continue to feed the positive electrode sheet and the negative electrode sheet that are spaced apart from the previous positive electrode sheet and the negative electrode sheet into the first cutting assembly and the second cutting assembly, respectively, to cut and form new positive electrode sheets and negative electrode sheets, and as the positive electrode sheet, the negative electrode sheet, the first diaphragm and the second diaphragm move forward, they are continuously combined, corrected, wound, and cut to obtain a battery cell, achieving continuous and uniform speed feeding and winding. After the previous roll of positive and negative electrode sheets is unwound, when a new roll needs to be replaced, it is only necessary to directly and quickly replace the new roll of the positive and negative electrode sheets, and there is no need to stop the machine to replace the positive and negative electrode sheets and then speed up.

[0068] It should be noted that the length of the positive electrode sheet and the head of the first diaphragm provided in the present application does not exceed one cell width, and the length of the negative electrode sheet and the head of the second diaphragm does not exceed one cell width. The length of the first diaphragm and the second diaphragm combined does not exceed the first spacing, and during the process of combining the first diaphragm and the second diaphragm, the area of ​​the first diaphragm and the second diaphragm corresponding to the tail of the previous positive electrode sheet and the negative electrode sheet is not combined.

[0069] In the present application, the width of the battery cell should be understood as the width of the outer surface of the battery cell formed by winding and in a direction perpendicular to the width direction of the positive electrode sheet and the negative electrode sheet.

[0070] The continuous film feeding and winding mechanism provided in the present application can realize continuous uniform film feeding and winding at a speed of more than 600 mm / s, and can even realize continuous uniform film feeding and winding at a speed of more than 1000 mm / s, or even more than 2000 mm / s, that is, the unwinding speed of the first diaphragm and the second diaphragm can be more than 600 mm / s, or even higher, such as more than 1000 mm / s, or more than 2000 mm / s. When the first diaphragm and the positive electrode sheet are combined, the running speed of the positive electrode sheet and the first diaphragm can be more than 600 mm / s, or even higher, such as more than 1000 mm / s, or more than 2000 mm / s; when the negative electrode sheet and the second diaphragm are combined, the running speed of the positive electrode sheet and the first diaphragm can be more than 600 mm / s, or even higher, such as more than 1000 mm / s, or more than 2000 mm / s; The travel speed of the negative electrode sheet and the second separator can be above 600 mm / s, or even higher, such as above 1000 mm / s or above 2000 mm / s; when the first separator and the second separator are combined, the travel speed of the positive electrode combination composite layer and the negative electrode combination composite layer can be above 600 mm / s, or even higher, such as above 1000 mm / s or above 2000 mm / s; after the positive electrode combination composite layer and the negative electrode combination composite layer are combined, they can be fed into the winding device at a speed of more than 600 mm / s, and even the winding speed can reach more than 1000 mm / s, or even more than 2000 mm / s, and the continuous uniform speed of feeding the sheet is maintained during this process.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A continuous film feeding and winding mechanism, characterized in that: include: An unwinding device, the unwinding device comprising a positive electrode unwinding and cutting device, a negative electrode unwinding and cutting device, a first diaphragm unwinding device and a second diaphragm unwinding device; A combining device, disposed downstream of the unwinding device, for combining the head of the cut positive electrode sheet with the first separator to form a positive electrode composite layer, combining the head of the cut negative electrode sheet with the second separator to form a negative electrode composite layer, and combining the positive electrode composite layer with the negative electrode composite layer to form a combined composite layer; A winding device, disposed downstream of the combining device, for cutting the separator and winding it to form a battery core; The head portion is a portion close to the moving direction of the positive electrode sheet / negative electrode sheet when the positive electrode sheet / negative electrode sheet is combined with the first diaphragm / second diaphragm.

2. The continuous film feeding and winding mechanism according to claim 1, characterized in that: The combining device comprises a first combining device, a second combining device and a third combining device, wherein the first combining device is used to combine the head of the cut positive electrode sheet with the first diaphragm to form a positive electrode composite layer; the second combining device is used to combine the head of the cut negative electrode sheet with the second diaphragm to form a negative electrode composite layer; The third combining device is located downstream of the first combining device and is used to combine the positive electrode composite layer with the negative electrode composite layer to form a combined composite layer.

3. The continuous film feeding and winding mechanism according to claim 2, characterized in that: The first bonding device and the second bonding device are both hot-press bonding devices or adhesive devices; the third bonding device is a hot-press bonding device or an electrostatic generator.

4. The continuous film feeding and winding mechanism according to claim 3, characterized in that: The first combining device comprises a first combining assembly, a first driver and a first meter; the first combining assembly comprises a second combining member and a first combining member, and a gap for the positive electrode sheet and the first diaphragm to pass through is provided between the second combining member and the first combining member; The first driver is connected to the first combining member and drives the first combining member to contact with or move away from the first diaphragm, and the distance between the first combining member and the second combining member is not greater than the sum of the thicknesses of the positive electrode sheet and the first diaphragm; The first meter is used to collect the time when the first binding component contacts or moves away from the first diaphragm; The second combining device includes a second combining assembly, a third driver, and a second meter; the second combining assembly includes a fourth combining member and a third combining member, and a gap for the negative electrode sheet and the second diaphragm to pass through is provided between the fourth combining member and the third combining member; the third driver is connected to the third combining member and drives the third combining member to contact / move away from the second diaphragm, and the gap between the third combining member and the fourth combining member is not greater than the sum of the thickness of the negative electrode sheet and the second diaphragm; The second meter is used to collect the time when the second binding component contacts / leaves the second diaphragm; The third combining device includes a fifth combining member, a sixth combining member, a fifth driver, a sixth driver and a third meter. A gap through which the positive electrode composite layer and the negative electrode composite layer pass is provided between the fifth combining member and the sixth combining member. The fifth driver is connected to the fifth combining member and drives the fifth combining member to contact / move away from the first diaphragm / the positive electrode plate and / or the sixth driver is connected to the sixth combining member and drives the sixth combining member to contact / move away from the second diaphragm, and makes the first diaphragm / the positive electrode plate contact with the second diaphragm. The third meter is used to collect the time when the fifth combining member contacts / moves away from the first diaphragm / the positive electrode plate or the sixth combining member contacts / moves away from the second diaphragm.

5. The continuous film feeding and winding mechanism according to claim 4, characterized in that: The first bonding device comprises a first heating component, which is arranged on the first bonding component and is used to heat the first bonding component; The second bonding device comprises a second heating component, which is arranged on the second bonding component and is used for heating the second bonding component; The third combining device comprises a third heating assembly and a fourth heating assembly, and the third heating assembly and the fourth heating assembly are respectively arranged on the fifth combining piece and the sixth combining piece and are used for heating the fifth combining piece and the sixth combining piece.

6. The continuous film feeding and winding mechanism according to claim 4, characterized in that: The first combining device further comprises a seventh driver, wherein the seventh driver drives the first combining component to move toward the moving direction of the positive electrode sheet, and the moving speed of the first combining component is equal to the moving speed of the positive electrode sheet; The second combining device further comprises an eighth driver, wherein the eighth driver drives the second combining assembly to move toward the moving direction of the negative electrode sheet, and the moving speed of the second combining assembly is equal to the moving speed of the negative electrode sheet; The third combining device includes a ninth driver, and the ninth driver drives the fifth combining member and the sixth combining member to move in the moving direction of the combined composite layer, and the moving speed of the fifth combining member and the sixth combining member is equal to the moving speed of the combined composite layer.

7. The continuous film feeding and winding mechanism according to claim 3, characterized in that: It also includes a controller, which is communicatively connected with the first combining device, the second combining device and the third combining device.

8. The continuous film feeding and winding mechanism according to claim 1, characterized in that: The positive electrode unwinding and cutting device comprises a positive electrode unwinding assembly, a first buffer assembly, a first pinching sheet assembly and a first cutting assembly which are arranged in sequence; the positive electrode unwinding assembly unwinds the positive electrode sheet to the first cutting assembly, and the first cutting assembly cuts the positive electrode sheet to form a cut positive electrode sheet; the first buffer assembly is located between the positive electrode unwinding assembly and the first cutting assembly, and is used to increase the distance between two adjacent cut positive electrode sheets; the first pinching sheet assembly is located between the first buffer assembly and the first cutting assembly, and is used to pinch and feed the positive electrode sheet to the first cutting assembly; The negative electrode unwinding and cutting device includes a negative electrode unwinding assembly, a second buffer assembly, a second clamping sheet assembly and a second cutting assembly; the negative electrode unwinding assembly unwinds the negative electrode sheet to the second cutting assembly, and the second cutting assembly cuts the negative electrode sheet to form a cut negative electrode sheet; the second buffer assembly is located between the negative electrode unwinding assembly and the second cutting assembly, and is used to increase the distance between two adjacent cut negative electrode sheets; the second clamping sheet assembly is located between the second buffer assembly and the second cutting assembly, and is used to clamp the negative electrode sheet to the second cutting assembly.

9. The continuous film feeding and winding mechanism according to claim 8, characterized in that: A first deviation-correcting component is also provided between the first buffer component and the first cutting component; A second deviation correcting component is also arranged between the second buffer component and the second cutting component.

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