Battery cell film-wrapping method and system

Abstract

A battery cell film-wrapping method and system. The battery cell film-wrapping method comprises: controlling a film pulling mechanism (11) to pull a packaging film (21) from a film material roll and unfold the packaging film; controlling a material pushing mechanism (12) to push a battery cell (30) waiting for film wrapping to move in a first direction at a first speed, so that a first surface (31) of the battery cell abuts against the packaging film; and controlling the material pushing mechanism to push the battery cell to continue to move in the first direction at a second speed, and controlling a first press roller assembly (131) and a second press roller assembly (132) in a press roller mechanism to respectively press against the packaging film located on both sides of the first surface, so as to press the packaging film onto a second surface (32) and a third surface of the battery cell, wherein the first speed is greater than the second speed.

Description

Battery cell film wrapping method and system

[0001] Cross-reference to Related Applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410628399.1, filed on May 21, 2024, entitled “Battery cell film wrapping method and system”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of battery production, and in particular to a battery cell film wrapping method and system. BACKGROUND

[0004] This section is intended to provide background or context to the embodiments of the present disclosure. The description herein is not admitted to be prior art merely by inclusion in this section.

[0005] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used, and batteries are also increasingly used in the energy storage field and the like.

[0006] In order to protect the battery, it is necessary to wrap a packaging film on the surface of the battery cell during the production of the battery. The integrity and quality of the packaging film are crucial to the performance and safety of the battery. The presence of bubbles can cause the wrapped packaging film to not fully contact the battery cell, thereby affecting the performance and safety of the battery product.

[0007] SUMMARY

[0008] Therefore, the embodiments of the present disclosure aim to provide a battery cell film wrapping method and system, which can reduce the generation of bubbles in the battery cell film wrapping process, thereby improving the performance and safety of the battery product and improving the production efficiency of the battery product.

[0009] To achieve the above-mentioned purpose, a first aspect of the embodiments of the present disclosure provides a battery cell film wrapping method, comprising:

[0010] controlling a film pulling mechanism to pull the packaging film from a film roll and to unfold the packaging film;

[0011] controlling a material pushing mechanism to push the battery cell to be wrapped to move along a first direction at a first speed, so that a first surface of the battery cell abuts against the packaging film;

[0012] controlling the material pushing mechanism to continue to move the battery cell along the first direction at a second speed, and controlling a first roller assembly and a second roller assembly in a roller pressing mechanism to press against the packaging film located on both sides of the first surface, respectively, so as to roll press the packaging film to a second surface and a third surface of the battery cell; wherein the first speed is greater than the second speed.

[0013] In the cell film wrapping method of the embodiments of the present disclosure, first, the film pulling mechanism is controlled to pull the wrapping film from the film roll and to unfold the wrapping film; then, the material pushing mechanism is controlled to push the cell to be wrapped to move along the first direction at a first speed, so that the first surface of the cell abuts against the wrapping film; finally, the material pushing mechanism is controlled to continue to push the cell to move along the first direction at a second speed, and the first and second roller assemblies in the roller mechanism are controlled to press against the wrapping film on both sides of the first surface, so as to roll the wrapping film to the second and third surfaces of the cell; wherein the first speed is greater than the second speed. In this way, on the one hand, before the first surface of the cell abuts against the wrapping film, since the film wrapping has not been performed, the cell is pushed by the material pushing mechanism to move at a larger first speed, which can improve the conveying speed of the cell to be wrapped, thereby improving the production efficiency of the battery product; on the other hand, during the process that the first surface of the cell abuts against the wrapping film and continues to move to roll the wrapping film to the second and third surfaces of the cell, the material pushing mechanism pushes the cell to move at a smaller second speed, which can reduce the generation of bubbles during the rolling of the wrapping film, thereby improving the quality of the cell film wrapping, and further improving the performance and safety of the battery product.

[0014] In some embodiments, the first speed includes a first sub-speed and a second sub-speed, the first sub-speed is greater than the second sub-speed, and the second sub-speed is greater than the second speed;

[0015] The material pushing mechanism is controlled to push the cell to be wrapped to move along the first direction at a first speed, including:

[0016] The material pushing mechanism is controlled to push the cell to be wrapped to move along the first direction at a first sub-speed to a preset deceleration position;

[0017] In response to the cell reaching the preset deceleration position, the material pushing mechanism is controlled to push the cell to move along the first direction at a second sub-speed, so that the first surface of the cell abuts against the wrapping film.

[0018] In the above embodiment, the preset deceleration position is arranged before the first surface of the battery cell abuts against the packaging film, and the pushing mechanism pushes the battery cell to move at the first sub-speed before the battery cell reaches the preset deceleration position, and the pushing mechanism pushes the battery cell to decelerate to the second sub-speed after the battery cell reaches the preset deceleration position. In this way, on the one hand, the air bubbles generated due to the too fast speed of the battery cell abutting against the packaging film can be reduced; on the other hand, since there can be a gap near the packaging film in the conveying track of the battery cell, or the distance between the battery cell and the first compression roller assembly and / or the second compression roller assembly is relatively close when the battery cell abuts against the packaging film, by decelerating the battery cell after the battery cell reaches the preset deceleration position, the inertia caused by the movement of the battery cell can be reduced, and the position of the battery cell when abutting against the packaging film can be more accurately controlled, so that the battery cell can be prevented from sliding into the gap near the packaging film in the conveying track, and the collision between the battery cell and the first compression roller assembly and / or the second compression roller assembly when the battery cell abuts against the packaging film can be reduced, thereby effectively improving the safety of the battery cell.

[0019] In some embodiments, before the pushing mechanism is controlled to continue to push the battery cell to move at the second speed in the first direction, and the first compression roller assembly and the second compression roller assembly in the compression roller mechanism are controlled to respectively abut against the packaging film located on both sides of the first surface, the method further comprises: controlling the first compression roller assembly to move in the second direction to roll the packaging film on the first surface; or, controlling the second compression roller assembly to move in the third direction to roll the packaging film on the first surface, the second direction being opposite to the third direction.

[0020] In the above embodiment, after the first surface of the battery cell abuts against the packaging film, the packaging film is more closely attached to the first surface by controlling the first compression roller assembly to move in the second direction to roll the packaging film on the first surface, or controlling the second compression roller assembly to move in the third direction to roll the packaging film on the first surface, thereby reducing the generation of air bubbles.

[0021] In some embodiments, the film pulling mechanism comprises a pulling assembly; and the control of the film pulling mechanism to pull the packaging film from the film roll and to unfold the packaging film comprises: control of the pulling assembly to pull the leading end of the packaging film on the film roll to release and unfold the packaging film on the film roll.

[0022] The method further comprises:

[0023] During the control of the pushing mechanism to continue to push the battery cell to move at the second speed in the first direction, the pulling assembly is controlled to move in the direction close to the battery cell, so that the tension of the packaging film during the rolling of the packaging film is kept constant.

[0024] In the above embodiment, during the movement of the pushing mechanism to push the battery cell to abut against the packaging film at the second speed, the pulling assembly is controlled to move in the direction close to the battery cell, so that the tension of the packaging film during the rolling of the packaging film is kept constant. In this way, the generation of air bubbles during the packaging of the battery cell can be further reduced.

[0025] In some embodiments, the pulling assembly, the first roller assembly and the second roller assembly perform a three-axis interpolation motion during the process that the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed.

[0026] In the above embodiments, during the process that the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed to coat the second face and the third face of the battery cell, the pulling assembly, the first roller assembly and the second roller assembly perform a three-axis interpolation motion, which can more accurately control the speed of the pulling assembly conveying the packaging film, the first roller assembly over-roller pressure and the second roller assembly over-roller pressure, thereby further reducing the generation of bubbles in the process of coating the battery cell.

[0027] In some embodiments, the first roller assembly and the second roller assembly respectively adopt a first over-roller pressure and a second over-roller pressure to press the packaging film located on both sides of the first face;

[0028] The method further comprises:

[0029] obtaining historical coating parameters used in at least one historical coating process; wherein the historical battery cells that have completed coating in the historical coating process meet the coating quality requirements;

[0030] determining the current coating parameters based on the historical coating parameters; the current coating parameters include at least one of the following: the first speed, the second speed, the first over-roller pressure and the second over-roller pressure.

[0031] In the above embodiments, the current coating parameters are determined based on the historical coating parameters used in at least one historical coating process. Since the historical battery cells that have completed coating in the historical coating process meet the coating quality requirements, determining the current coating parameters based on the historical coating parameters can make the coating process more stable and accurate, thereby further improving the stability of the coating quality of the battery cell.

[0032] A second aspect of the embodiments of the present disclosure provides a battery cell coating system, comprising:

[0033] a film pulling mechanism configured to pull the packaging film from a film roll and unfold the packaging film;

[0034] a pushing mechanism configured to carry a battery cell to be coated and push the battery cell to move in a first direction at a first speed so that a first face of the battery cell abuts the packaging film, and continue to move in the first direction at a second speed to abut the packaging film; wherein the first speed is greater than the second speed;

[0035] The pressing roller mechanism comprises a first pressing roller assembly and a second pressing roller assembly; during the process that the pushing mechanism pushes the battery cell to continue moving along the first direction at the second speed and abutting against the packaging film, the first pressing roller assembly and the second pressing roller assembly press the packaging film located on both sides of the first surface respectively, so as to roll the packaging film to the second surface and the third surface of the battery cell.

[0036] In the battery cell film coating system, the pushing mechanism is used to push the battery cell to be coated to move along the first direction at the first speed, so that the first surface of the battery cell abuts against the packaging film, and the pushing mechanism is used to push the battery cell to continue moving along the first direction at the second speed; during the process that the battery cell continues to move along the first direction at the second speed and abuts against the packaging film, the first pressing roller assembly and the second pressing roller assembly of the pressing roller mechanism press the packaging film located on both sides of the first surface respectively, so as to roll the packaging film to the second surface and the third surface of the battery cell; wherein the first speed is greater than the second speed. In this way, on the one hand, before the first surface of the battery cell abuts against the packaging film, since the film coating has not been performed, the battery cell is pushed to move at the first speed, which is relatively large, by the pushing mechanism, so that the conveying speed of the battery cell to be coated is improved, thereby improving the production efficiency of the battery product; on the other hand, during the process that the first surface of the battery cell abuts against the packaging film and continues to move to roll the packaging film to the second surface and the third surface of the battery cell, the pushing mechanism pushes the battery cell to move at the second speed, which is relatively small, so that the generation of bubbles during the rolling of the packaging film is reduced, thereby improving the quality of the film coating of the battery cell, and further improving the performance and safety of the battery product.

[0037] In some embodiments, the first speed comprises a first sub-speed and a second sub-speed, the first sub-speed is greater than the second sub-speed, and the second sub-speed is greater than the second speed;

[0038] The pushing mechanism is further used to push the battery cell to be coated to move along the first direction at the first sub-speed to a preset deceleration position; in the case that the battery cell reaches the preset deceleration position, the pushing mechanism pushes the battery cell to move along the first direction at the second sub-speed, so that the first surface of the battery cell abuts against the packaging film.

[0039] In the above embodiment, the preset deceleration position is arranged before the first surface of the battery cell abuts against the packaging film, and the pushing mechanism pushes the battery cell to move at the first sub-speed before the battery cell reaches the preset deceleration position, and the pushing mechanism pushes the battery cell to decelerate to the second sub-speed after the battery cell reaches the preset deceleration position. In this way, on the one hand, the air bubbles generated due to the too fast speed of the battery cell abutting against the packaging film can be reduced; on the other hand, since there can be a gap near the packaging film in the conveying track of the battery cell, or the distance between the battery cell and the first compression roller assembly and / or the second compression roller assembly is relatively close when the battery cell abuts against the packaging film, by decelerating the battery cell after the battery cell reaches the preset deceleration position, the inertia caused by the movement of the battery cell can be reduced, and the position of the battery cell when abutting against the packaging film can be more accurately controlled, so that the battery cell sliding into the gap near the packaging film in the conveying track can be reduced, and the collision between the battery cell and the first compression roller assembly and / or the second compression roller assembly when the battery cell abuts against the packaging film can be reduced, so that the safety of the battery cell can be effectively improved.

[0040] In some embodiments, the first compression roller assembly is further configured to move the packaging film on the first surface in the second direction before the pushing mechanism continues to push the battery cell to move at the second speed in the first direction.

[0041] Alternatively, the second compression roller assembly is further configured to move the packaging film on the first surface in the third direction before the pushing mechanism continues to push the battery cell to move at the second speed in the first direction, and the second direction is opposite to the third direction.

[0042] In the above embodiment, after the first surface of the battery cell abuts against the packaging film, the packaging film on the first surface is rolled by the first compression roller assembly moving in the second direction or by the second compression roller assembly moving in the third direction, so that the packaging film can be more closely attached to the first surface, and the generation of air bubbles can be reduced.

[0043] In some embodiments, the film pulling mechanism includes a pulling assembly.

[0044] The pulling assembly is configured to pull the leading end of the packaging film on the film material roll to release and expand the packaging film on the film material roll.

[0045] During the process that the pushing mechanism continues to push the battery cell to move at the second speed in the first direction, the pulling assembly moves in the direction close to the battery cell, so that the tension of the packaging film during the rolling process is kept constant.

[0046] In the above embodiment, during the process that the pushing mechanism pushes the battery cell to move at the second speed to abut against the packaging film, the pulling assembly is controlled to move in the direction close to the battery cell, so that the tension of the packaging film during the rolling process is kept constant. In this way, the generation of air bubbles during the process of wrapping the battery cell with the packaging film can be further reduced.

[0047] In some embodiments, the pulling assembly, the first roller assembly and the second roller assembly perform a three-axis interpolation motion during the process that the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed.

[0048] In the above embodiments, by controlling the pulling assembly, the first roller assembly and the second roller assembly to perform a three-axis interpolation motion during the process that the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed to coat the second face and the third face of the battery cell, the speed of the pulling assembly conveying the packaging film, the roller pressure of the first roller assembly and the roller pressure of the second roller assembly can be more accurately controlled, thereby further reducing the generation of bubbles during the coating of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0049] FIG. 1 is a schematic diagram of the structure of an electrode coating system according to an embodiment of the present disclosure;

[0050] FIG. 2 is a schematic diagram of the structure of a square battery cell according to an embodiment of the present disclosure;

[0051] FIG. 3 is a schematic diagram of a film pulling mechanism pulling a packaging film according to an embodiment of the present disclosure;

[0052] FIG. 4 is a schematic diagram of the implementation process of an electrode coating method according to an embodiment of the present disclosure;

[0053] FIG. 5 is a schematic diagram of the implementation process of an electrode coating method according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0054] It should be noted that the embodiments and technical features in the present disclosure can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and description of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present disclosure.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0056] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0057] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0058] In the description of the embodiments of the disclosure, the term“and / or” is only a description of an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character“ / ” herein generally represents that the front and rear associated objects are in an“or” relationship.

[0059] In the description of the embodiments of the disclosure, the technical terms“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“circumferential”,“height direction”,“first direction”,“second direction” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, be operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0060] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0061] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical term“contact” should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0062] With the development of clean energy, more and more devices use electric energy as driving energy, and then as power battery which can store more electric energy and can be charged and discharged repeatedly, such as lithium ion battery. Among them, the power battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0063] In the embodiments of the present disclosure, the battery cell can be a battery monomer. The battery monomer refers to a basic unit capable of realizing mutual conversion between chemical energy and electric energy, which can be used to make a battery module or a battery pack, thereby being used to supply power to a power consumption device. The battery monomer can be a primary battery or a secondary battery, and the secondary battery refers to a battery monomer that can be activated by charging after discharging. The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, or a lead-acid battery, etc. The embodiments of the present disclosure are not limited thereto. The battery monomer can be in the shape of a cylinder, a cuboid or other shapes, etc.

[0064] The battery monomer includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery monomer mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that no fuse occurs when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (Polypropylene) or PE (Polyethylene), etc.

[0065] In the production process of the battery, in order to protect the battery, a packaging film (i.e. insulation film, also known as packaging glue) needs to be wrapped on the surface of the square cell. The packaging film can include, but is not limited to, at least one of Mylar film, blue film, etc., and the shell can be an aluminum shell or a steel shell, etc. Among them, the packaging film plays a role of sealing and protecting the cell, therefore, the integrity and quality of the wrapped insulation film is crucial to the performance and safety of the battery.

[0066] The embodiment of the present disclosure provides a cell film wrapping system, and FIG. 1 is a schematic diagram of the composition structure of a cell film wrapping system provided by the embodiment of the present disclosure. As shown in FIG. 1, the cell film wrapping system 10 includes:

[0067] The film pulling mechanism 11 is used to pull the packaging film 21 from the film roll (not shown in the figure) and unfold the packaging film 21;

[0068] The material pushing mechanism 12 is used to carry the cell 30 to be wrapped with film, and push the cell 30 to move along the first direction at a first speed, so that the first surface of the cell 30 abuts against the packaging film 21, and push the cell 30 to continue to move along the first direction at a second speed abutting against the packaging film 21; wherein the first speed is greater than the second speed;

[0069] The roller mechanism includes a first roller assembly 131 and a second roller assembly 132; during the process that the material pushing mechanism 12 pushes the cell 30 to continue to move along the first direction at a second speed abutting against the packaging film 21, the first roller assembly 131 and the second roller assembly 132 respectively press the packaging film 21 located on both sides of the first surface to roll the packaging film 21 to the second surface and the third surface of the cell.

[0070] Here, the cell 30 is a square cell. For example, as shown in FIG. 2, the cell 30 is a cuboid, including a top surface, a bottom surface (first surface 31) and four side surfaces. Among them, the side surface located on the upper side is the second surface 32, and the side surface located on the lower side is the third surface (not shown in the figure); the second surface 32 and the third surface are wider, also known as large surfaces. When wrapping the cell 30 with film, the packaging film needs to cover at least the first surface 31, the second surface 32 and the third surface. After wrapping, the packaging film wrapped on the shell of the cell 30 is in a U shape.

[0071] The film roll is a roll of packaging film placed in a roll, which can be placed in a stock bin. The film pulling mechanism 11 can unfold the packaging film 21 pulled from the film roll. For example, referring to FIG. 3, the film pulling mechanism 11 can pull the packaging film 21 in the film roll from top to bottom to unfold on the moving path of the cell 30 to be wrapped with film, so that during the process that the material pushing mechanism 12 pushes the cell 30 to move along the first direction at a first speed, the first surface 31 of the cell 30 can abut against the packaging film 21.

[0072] The first speed and the second speed can be any suitable value set in advance according to actual conditions, and the embodiments of the present disclosure do not limit this.

[0073] In some embodiments, still referring to FIG. 1, the film pulling mechanism 11 can be driven by a first driving mechanism 14, the material pushing mechanism 12 can be driven by a second driving mechanism 15, the first compression roller assembly 131 can be driven by a third driving mechanism 16, and the second compression roller assembly 132 can be driven by a fourth driving mechanism 17. The embodiments of the first driving mechanism 14, the second driving mechanism 15, the third driving mechanism 16, and the fourth driving mechanism 17 are not limited. For example, the first driving mechanism 14, the second driving mechanism 15, the third driving mechanism 16, and the fourth driving mechanism 17 can include, but are not limited to, a pneumatic cylinder, a servo motor, and / or the like.

[0074] In the cell film wrapping system of the embodiments of the present disclosure, the material pushing mechanism is used to push the cell to be wrapped to move along the first direction at the first speed, so that the first surface of the cell abuts against the wrapping film, and the material pushing mechanism is used to push the cell to continue to move along the first direction at the second speed. During the process that the cell continues to move along the first direction at the second speed and abuts against the wrapping film, the first compression roller assembly and the second compression roller assembly in the compression roller mechanism respectively press the wrapping film located on both sides of the first surface, so as to roll the wrapping film to the second surface and the third surface of the cell. The first speed is greater than the second speed. In this way, on the one hand, before the first surface of the cell abuts against the wrapping film, since the film wrapping has not been performed, the cell is pushed by the material pushing mechanism to move at the first speed, which can improve the conveying speed of the cell to be wrapped, thereby improving the production efficiency of the battery product. On the other hand, during the process that the first surface of the cell abuts against the wrapping film and continues to move to roll the wrapping film to the second surface and the third surface of the cell, the material pushing mechanism pushes the cell to move at the second speed, which can reduce the generation of bubbles during the rolling of the wrapping film, thereby improving the quality of the cell film wrapping, and further improving the performance and safety of the battery product.

[0075] In some embodiments, the first speed includes a first sub-speed and a second sub-speed, the first sub-speed is greater than the second sub-speed, and the second sub-speed is greater than the second speed.

[0076] The material pushing mechanism 12 is further used to push the cell 30 to be wrapped to move along the first direction at the first sub-speed to a preset deceleration position, and push the cell 30 to move along the first direction at the second sub-speed in the case that the cell 30 reaches the preset deceleration position, so that the first surface 31 of the cell abuts against the wrapping film 21.

[0077] The first sub-speed and the second sub-speed can be set according to actual production scenarios, and the embodiments of the present disclosure do not limit this.

[0078] It can be understood that the preset deceleration position can be a preset position before the packaging film in a path of the battery cell 30 moving in the first direction. During the process of the battery cell 30 moving in the first direction, the battery cell 30 will first reach the preset deceleration position, and then continue to move to the position where the packaging film is located from the preset deceleration position to abut against the packaging film.

[0079] In the above embodiment, the preset deceleration position is arranged before the first surface of the battery cell abuts against the packaging film, and the pushing mechanism pushes the battery cell to move at the first sub-speed before the battery cell reaches the preset deceleration position, and the pushing mechanism pushes the battery cell to decelerate to the second sub-speed after the battery cell reaches the preset deceleration position. In this way, on the one hand, the bubbles generated due to the too fast speed of the battery cell abutting against the packaging film can be reduced; on the other hand, since there can be a gap near the packaging film in the conveying track of the battery cell, or the distance between the battery cell and the first roller assembly and / or the second roller assembly is close when the battery cell abuts against the packaging film, by decelerating the battery cell after the battery cell reaches the preset deceleration position, the inertia caused by the movement of the battery cell can be reduced, and the position of the battery cell when abutting against the packaging film can be more accurately controlled, so that the situation that the battery cell slides into the gap near the packaging film in the conveying track can be reduced, and the collision between the battery cell and the first roller assembly and / or the second roller assembly when the battery cell abuts against the packaging film can be reduced, so that the safety of the battery cell can be effectively improved.

[0080] In some embodiments, the first roller assembly 131 is further configured to move the packaging film 21 on the first surface 31 in a second direction before the pushing mechanism 12 pushes the battery cell 30 to continue to move in the first direction at the second speed.

[0081] Alternatively, the second roller assembly 132 is further configured to move the packaging film on the first surface 31 in a third direction before the pushing mechanism 12 pushes the battery cell 30 to continue to move in the first direction at the second speed, the second direction being opposite to the third direction.

[0082] Here, the second direction and the third direction are directions parallel to the first surface 31.

[0083] In some embodiments, the first roller assembly 131 or the second roller assembly 132 moves to roll the packaging film on the first surface 31, and can avoid the first surface 31.

[0084] In some embodiments, the first direction is perpendicular to the first surface 31, and the second direction and the third direction can be perpendicular to the first direction. For example, the first direction is a horizontal direction, the second direction is a vertical downward direction, and the third direction is a vertical upward direction.

[0085] In the above embodiments, after the first face of the battery cell abuts against the packaging film, the first roller assembly moves the packaging film on the first face in the second direction or the second roller assembly moves the packaging film on the first face in the third direction, so that the packaging film is more closely attached to the first face, and the generation of bubbles is reduced.

[0086] In some embodiments, the battery cell film wrapping system 10 can further comprise a fixing mechanism; before the first roller assembly 131 moves the packaging film 21 on the first face 31 in the second direction or the second roller assembly 132 moves the packaging film 21 on the first face 31 in the third direction, the fixing mechanism can be used to fix the battery cell, so that the battery cell 30 is fixed during the process of the first roller assembly 131 moving the packaging film 21 on the first face 31 in the second direction or the second roller assembly 132 moving the packaging film 21 on the first face 31 in the third direction, so that the packaging film 21 on the first face 31 is rolled more tightly, and the generation of bubbles in the process of wrapping the battery cell with the packaging film is further reduced.

[0087] In some embodiments, the film pulling mechanism 11 comprises a pulling assembly;

[0088] The pulling assembly is used to pull the first end of the packaging film 21 on the film roll, so as to release and unfold the packaging film 21 on the film roll;

[0089] During the process of the pushing mechanism 12 pushing the battery cell 30 to continue moving in the first direction at the second speed, the pulling assembly moves in the direction close to the battery cell 30, so that the tension of the packaging film 21 during the rolling process is kept constant.

[0090] In the above embodiments, during the process of the pushing mechanism pushing the battery cell to abut against the packaging film and move at the second speed, the pulling assembly is controlled to move in the direction close to the battery cell, so that the tension of the packaging film during the rolling process is kept constant. In this way, the generation of bubbles in the process of wrapping the battery cell with the packaging film can be further reduced.

[0091] In some embodiments, during the process of controlling the pushing mechanism 12 to push the battery cell 30 to continue moving in the first direction at the second speed, the pulling assembly, the first roller assembly 131 and the second roller assembly 132 perform three-axis interpolation motion.

[0092] The three-axis interpolation motion is one of multi-axis interpolation motions. Multi-axis interpolation motion refers to the process of determining the motion trajectory of an object by a numerical control system of a machine tool according to a certain method. Its function is to calculate the feed instructions of each coordinate axis (i.e. motion axis) involved in interpolation motion according to the given information, and then drive the respective corresponding execution components to produce coordinated motion, so that the controlled mechanical components move along the ideal route and speed.

[0093] In some embodiments, the speed of the pulling assembly conveying the packaging film, the over-roller pressure of the first pressure roller assembly 131 and the over-roller pressure of the second pressure roller assembly 132 can be constantly calculated according to the current moving speed (i.e. the second speed) of the battery cell 30, so that the tension of the packaging film 21 during the process of rolling the packaging film 21 is kept constant. In practice, any suitable three-axis interpolation algorithm can be used to calculate the speed of the pulling assembly conveying the packaging film, the over-roller pressure of the first pressure roller assembly 131 and the over-roller pressure of the second pressure roller assembly 132 according to actual conditions, and the present disclosure is not limited thereto.

[0094] In the above embodiment, during the process that the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed to coat the second face and the third face of the battery cell, the speed of the pulling assembly conveying the packaging film, the over-roller pressure of the first pressure roller assembly and the over-roller pressure of the second pressure roller assembly can be more accurately controlled by controlling the three-axis interpolation movement of the pulling assembly, the first pressure roller assembly and the second pressure roller assembly, so as to further reduce the generation of bubbles during the process of coating the battery cell.

[0095] The present disclosure provides a battery cell coating method applied to the above-mentioned battery cell coating system, as shown in FIG. 4, which includes the following steps S101 to S103:

[0096] Step S101, controlling the film pulling mechanism to pull the packaging film from the film roll and to unfold the packaging film;

[0097] Step S102, controlling the pushing mechanism to push the battery cell to be coated to move in the first direction at a first speed, so that the first face of the battery cell abuts against the packaging film;

[0098] Step S103, controlling the pushing mechanism to push the battery cell to continue moving in the first direction at a second speed, and controlling the first pressure roller assembly and the second pressure roller assembly in the pressure roller mechanism to respectively press against the packaging film located on both sides of the first face, so as to roll the packaging film to the second face and the third face of the battery cell; wherein the first speed is greater than the second speed.

[0099] In some embodiments, the above-mentioned battery cell coating system further includes a control device, and the battery cell coating method can be executed by the control device in the battery cell coating system. Here, the control device is used to control the running process of each mechanism in the battery cell coating system. The control device can include, but is not limited to, at least one of an industrial computer, a programmable logic controller (PLC), an upper computer, etc. The upper computer can be, for example, a server, a notebook computer, a tablet computer, a desktop computer, a smart phone, etc.

[0100] In the cell film wrapping method of the embodiments of the present disclosure, firstly, the film pulling mechanism is controlled to pull the wrapping film from the film roll and to unfold the wrapping film; then, the material pushing mechanism is controlled to push the cell to be wrapped to move along the first direction at a first speed, so that the first surface of the cell abuts against the wrapping film; finally, the material pushing mechanism is controlled to continue to push the cell to move along the first direction at a second speed, and the first and second roller assemblies in the roller mechanism are controlled to press against the wrapping film on both sides of the first surface respectively, so as to roll the wrapping film to the second and third surfaces of the cell; wherein the first speed is greater than the second speed. In this way, on the one hand, before the first surface of the cell abuts against the wrapping film, since the film wrapping has not been performed, the cell is pushed to move at the first speed, which is relatively large, so as to improve the conveying speed of the cell to be wrapped, thereby improving the production efficiency of the battery product; on the other hand, during the process that the cell continues to move after the first surface abuts against the wrapping film to roll the wrapping film to the second and third surfaces of the cell, the cell is pushed to move at the second speed, which is relatively small, so as to reduce the generation of bubbles during the rolling of the wrapping film, thereby improving the quality of the cell film wrapping, and further improving the performance and safety of the battery product.

[0101] In some embodiments, the first speed comprises a first sub-speed and a second sub-speed, the first sub-speed is greater than the second sub-speed, and the second sub-speed is greater than the second speed. The above step S102 can comprise the following steps S111 to S112:

[0102] In step S111, the material pushing mechanism is controlled to push the cell to be wrapped to move along the first direction to a preset deceleration position at the first sub-speed.

[0103] In step S112, in response to the cell reaching the preset deceleration position, the material pushing mechanism is controlled to push the cell to move along the first direction at the second sub-speed, so that the first surface of the cell abuts against the wrapping film.

[0104] In the above embodiment, the preset deceleration position is arranged before the first surface of the battery cell abuts against the packaging film, and the pushing mechanism pushes the battery cell to move at the first sub-speed before the battery cell reaches the preset deceleration position, and the pushing mechanism pushes the battery cell to decelerate to the second sub-speed after the battery cell reaches the preset deceleration position. In this way, on the one hand, the air bubbles generated due to the too fast speed of the battery cell abutting against the packaging film can be reduced; on the other hand, since there may be a gap near the packaging film in the conveying track of the battery cell, or the distance between the battery cell and the first compression roller assembly and / or the second compression roller assembly is relatively close when the battery cell abuts against the packaging film, by decelerating the battery cell after the battery cell reaches the preset deceleration position, the inertia caused by the movement of the battery cell can be reduced, and the position of the battery cell when abutting against the packaging film can be more accurately controlled, so that the battery cell sliding into the gap near the packaging film in the conveying track can be reduced, and the collision between the battery cell and the first compression roller assembly and / or the second compression roller assembly when the battery cell abuts against the packaging film can be reduced, so that the safety of the battery cell can be effectively improved.

[0105] In some embodiments, before the step S103, the above method for packaging a battery cell can further include the following step S121 or step S122:

[0106] The step S121 controls the first compression roller assembly to move in the second direction to compress the packaging film on the first surface.

[0107] The step S122 controls the second compression roller assembly to move in the third direction to compress the packaging film on the first surface, and the second direction is opposite to the third direction.

[0108] In the above embodiment, after the first surface of the battery cell abuts against the packaging film, the packaging film is more closely attached to the first surface by controlling the first compression roller assembly to move in the second direction to compress the packaging film on the first surface, or by controlling the second compression roller assembly to move in the third direction to compress the packaging film on the first surface, so that the generation of air bubbles can be reduced.

[0109] In some embodiments, the film pulling mechanism includes a pulling assembly. The above step S101 can include the following step S131:

[0110] The step S131 controls the pulling assembly to pull the leading end of the packaging film on the film material roll to release and expand the packaging film on the film material roll.

[0111] The above method for packaging a battery cell can further include the following step S132:

[0112] The step S132 controls the pulling assembly to move in the direction close to the battery cell to keep the tension of the packaging film constant during the process of compressing the packaging film, while the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed.

[0113] In the above embodiment, during the process that the pushing mechanism pushes the battery cell to abut against the packaging film moving at the second speed, the pulling assembly is controlled to move in the direction close to the battery cell, so that the tension of the packaging film is kept constant during the process that the packaging film is rolled. In this way, the generation of bubbles during the process of packaging the battery cell can be further reduced.

[0114] In some embodiments, during the process that the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed, the pulling assembly, the first roller assembly and the second roller assembly perform three-axis interpolation movement.

[0115] In the above embodiment, during the process that the pushing mechanism pushes the battery cell to continue moving in the first direction at the second speed to package the second face and the third face of the battery cell, by controlling the pulling assembly, the first roller assembly and the second roller assembly to perform three-axis interpolation movement, the speed of the pulling assembly conveying the packaging film, the first roller assembly and the second roller assembly can be more accurately controlled, so that the generation of bubbles during the process of packaging the battery cell can be further reduced.

[0116] In some embodiments, the first roller assembly and the second roller assembly respectively adopt the first roller pressure and the second roller pressure to press against the packaging film located on both sides of the first face.

[0117] The above battery cell packaging method can further include the following steps S141 to S142:

[0118] Step S141, obtaining historical packaging parameters used in at least one historical packaging process; wherein the historical battery cells that have completed packaging in the historical packaging process meet the packaging quality requirements.

[0119] Step S142, determining current packaging parameters based on the historical packaging parameters; the current packaging parameters include at least one of the following: the first speed, the second speed, the first roller pressure and the second roller pressure.

[0120] Here, the historical encapsulation parameters refer to the encapsulation parameters used in the historical encapsulation process. The historical encapsulation parameters can include, but are not limited to, at least one of a first historical speed, a second historical speed, a first historical over-roll pressure, and a second historical over-roll pressure. The first historical speed, the second historical speed, the first historical over-roll pressure, and the second historical over-roll pressure are respectively a first speed, a second speed, a first over-roll pressure, and a second over-roll pressure used in the historical encapsulation process. In the historical encapsulation process, the control device can control the film pulling mechanism to pull the packaging film from the film roll and unroll the packaging film; control the pushing mechanism to push the battery cell to be encapsulated to move along the first direction at the first historical speed, so that the first surface of the battery cell abuts against the packaging film; control the pushing mechanism to continue to push the battery cell to move along the first direction at the second historical speed, and control the first roller assembly and the second roller assembly in the roller mechanism to press against the packaging film on both sides of the first surface at the first historical over-roll pressure and the second historical over-roll pressure respectively, so as to roll the packaging film to the second surface and the third surface of the battery cell; and the first historical speed is greater than the second historical speed.

[0121] The encapsulation quality requirement can be determined according to actual process requirements, and embodiments of the present disclosure do not limit this. In some embodiments, the encapsulation quality requirement can include that the target quality parameter of the battery cell after encapsulation meets the preset parameter condition, wherein the target quality parameter includes, but is not limited to, at least one of the number of bubbles detected in the packaging film of the battery cell after encapsulation, the area of the bubbles detected in the packaging film of the battery cell after encapsulation, the thickness of the battery cell after encapsulation, the concave-convex degree of the battery cell after encapsulation, and the like. For example, the encapsulation quality requirement can include, but is not limited to, at least one of the following: the number of bubbles detected in the packaging film of the battery cell after encapsulation does not exceed a preset number threshold, and the area of the bubbles detected in the packaging film of the battery cell after encapsulation does not exceed a preset area threshold.

[0122] In implementation, the encapsulation quality of the historical battery cell after encapsulation in the historical encapsulation process can be detected to determine whether the historical battery cell meets the encapsulation quality requirement, and the historical encapsulation parameters used in the historical encapsulation process can be obtained in a case where it is determined that the historical battery cell meets the encapsulation quality requirement.

[0123] In some embodiments, a visual detection module can be used to visually detect the battery cell after encapsulation to obtain at least one of the number of bubbles in the packaging film of the battery cell after encapsulation, the area of the bubbles in the packaging film of the battery cell after encapsulation, the thickness of the battery cell after encapsulation, the concave-convex degree of the battery cell after encapsulation, and the like.

[0124] In some embodiments, the visual detection module can include an image acquisition module, which can include, but is not limited to, at least one of a two-dimensional camera, a three-dimensional camera, a depth camera, a line-scan camera, a face-scan camera, etc. For example, the image acquisition module can include a two-dimensional line-scan charge coupled device (CCD) camera.

[0125] Based on the historical coating parameters used in the at least one historical coating process, suitable current coating parameters can be determined to make the current coating process more stable and accurate. In practice, any suitable method can be used to determine the current coating parameters based on the historical coating parameters, which are not limited in the present disclosure.

[0126] In some embodiments, a parameter range of the historical coating parameters can be determined, and the current coating parameters can be determined from the parameter range. For example, in the case that the historical coating parameters include a first historical speed, a first speed range can be determined based on the first historical speed in the at least one historical coating process, and a first speed in the current coating parameters can be selected from the first speed range, where the first speed can be a maximum value, a minimum value, or a median value in the first speed range, etc., which are not limited in the present disclosure. For another example, in the case that the historical coating parameters include a second historical speed, a second speed range can be determined based on the second historical speed in the at least one historical coating process, and a second speed in the current coating parameters can be selected from the second speed range, where the second speed can be a maximum value, a minimum value, or a median value in the second speed range, etc., which are not limited in the present disclosure. For another example, in the case that the historical coating parameters include a first historical over-roll pressure, a first pressure range can be determined based on the first historical over-roll pressure in the at least one historical coating process, and a first over-roll pressure in the current coating parameters can be selected from the first pressure range, where the first over-roll pressure can be a maximum value, a minimum value, or a median value in the first pressure range, etc., which are not limited in the present disclosure. For another example, in the case that the historical coating parameters include a second historical over-roll pressure, a second pressure range can be determined based on the second historical over-roll pressure in the at least one historical coating process, and a second over-roll pressure in the current coating parameters can be selected from the second pressure range, where the second over-roll pressure can be a maximum value, a minimum value, or a median value in the second pressure range, etc., which are not limited in the present disclosure.

[0127] It should be noted that in the process of re-determining the first speed, the second speed, the first roll pressure and the second roll pressure in each coating process, a trend adjustment method can be used to make a trend fine adjustment on the first speed, the second speed, the first roll pressure and the second roll pressure based on the first historical speed, the second historical speed, the first historical roll pressure and the second historical roll pressure, so as to further improve the stability and accuracy in the coating process.

[0128] In the above embodiment, the current coating parameter is determined based on the historical coating parameter used in at least one historical coating process. Since the historical battery cell that has completed coating in the historical coating process meets the coating quality requirement, determining the current coating parameter based on the historical coating parameter can make the coating process more stable and accurate, thereby further improving the stability of the battery cell coating quality.

[0129] The following takes the scenario of coating a blue film on a battery cell as an example to illustrate the battery cell coating method provided by the embodiments of the present disclosure. As shown in FIG. 5, the battery cell coating method includes the following steps S501 to S509:

[0130] Step S501, control the glue pulling rod to unfold the first end of the film material roll on the blue film from the top to the bottom;

[0131] Here, the glue pulling rod can correspond to the pulling assembly in the foregoing embodiment.

[0132] Step S502, control the pushing mechanism to push the battery to the bottom surface coating position along the first direction at a first speed, so that the bottom surface of the battery cell abuts against the blue film;

[0133] Here, the bottom surface coating position refers to the position where the bottom surface of the battery cell can abut against the blue film.

[0134] Step S503, control the fixing mechanism to fix the battery, and control the downward roller to roll down and adhere to the bottom surface of the battery cell;

[0135] Here, the downward roller corresponds to the first pressure roller assembly in the foregoing embodiment.

[0136] Step S504, control the downward roller to reset;

[0137] Step S505, control the pushing mechanism to push the battery cell to continue moving along the first direction at a second speed, and control the downward roller and the upward roller to press the blue film on both sides of the bottom surface of the battery cell respectively, so as to roll the blue film to the two large surfaces of the battery cell;

[0138] Here, the two large surfaces of the battery cell correspond to the second surface and the third surface in the foregoing embodiment respectively.

[0139] In order to ensure that the blue film remains flat, a rubber pulling rod is usually used to stretch the blue film. During the process of rolling the blue film to the two large faces, the rubber pulling rod is constantly lifted to maintain the tension of the blue film.

[0140] Step S506, control the pushing mechanism to reset;

[0141] Step S507, control the cutting mechanism to cut the blue film, and control the lower roller and the upper roller to reset;

[0142] In the process of packaging the lithium battery cell, the blue film is usually used to wrap the three faces of the square cell (the bottom face, the upper side face, and the lower side face), and the two sides are extended by a certain length to wrap the remaining two faces (the left side face and the right side face). The blue film extending from each face has an intersection between adjacent faces. In order to better fold the blue film, the blue film can be cut near the intersection, that is, "cutting two characters".

[0143] Step S508, control the ejection clamp to lift and clamp the cell;

[0144] Step S509, control the ejection clamp to clamp the cell and move to the side edge folding station.

[0145] The side edge folding station is used to fold the blue film extending from each face of the cell wrapped with the bottom face and the large face, to wrap the two unwrapped side faces.

[0146] In some embodiments, the generation and diffusion of bubbles can also be reduced by optimizing the selection and structural design of the blue film material. For example, a packaging material with uniform mass, certain strength and wear resistance is selected as the blue film to reduce surface defects or unevenness, reduce sharp corners or overly tight contact surfaces, and reduce the generation of bubbles caused by material extrusion during packaging. Alternatively, a bubble barrier layer can be added to the packaging material to effectively isolate the generation and diffusion of bubbles. For example, after verifying the packaging effect of blue films with different adhesiveness, a blue film with appropriate adhesiveness is selected to facilitate unwinding while meeting the requirement of firmness of the blue film.

[0147] In some embodiments, precise packaging process control, multi-axis interpolation control, etc. can be used to precisely control parameters such as the over-rolling pressure of the upper roller, the over-rolling pressure of the lower roller, the cell feeding speed of the pushing mechanism, and / or the film feeding speed of the rubber pulling rod, to minimize the generation of bubbles. For example, during the packaging process, the cell feeding speed, the blue film feeding speed, and the over-rolling pressure are controlled to avoid the generation and diffusion of bubbles caused by excessively fast cell feeding speed and blue film feeding speed, and / or excessively large over-rolling pressure.

[0148] In some embodiments, a high-precision bubble detection device can be introduced to timely find the bubbles on the packaging blue film and locate the position and size of the bubbles.

[0149] In some embodiments, an intelligent automatic control system (for example, a visual camera + PLC) can be used to monitor and adjust the relevant input and output parameters in real time during the packaging process to ensure that the quality of the zero-bubble blue film reaches the best state. For example, the quality of the blue film is judged according to the bubble area size, number, cell thickness, and concave-convex degree. In combination with process control feedback, automatic trend adjustment of parameters such as roller pressure and cell feeding speed is realized to ensure the stability and accuracy of the packaging process. The input parameter value range that can meet the quality requirements of the blue film is obtained from the historical monitoring data, and the input parameter is trend adjusted according to the value median in the input parameter value range to ensure that the input parameter is stable and reliable, wherein the input parameter includes but is not limited to the first speed, the second speed, the first roller pressure, and / or the second roller pressure. In order to save storage space, the historical monitoring data can no longer continue to accumulate and update after the quality of the blue film tends to be stable, or only the typical input parameters of the good quality blue film can be stored.

[0150] In the embodiments of the present disclosure, through the innovation of the selection, structural design, process control, and the like of the packaging material, the generation of bubbles during the packaging of the blue film of the battery cell can be effectively reduced, the quality of the packaging blue film can be improved, and the production efficiency and product quality of the lithium battery can be improved.

[0151] In the description of the present disclosure, the description of the terms "in an embodiment", "in some embodiments", "in another embodiment", "in yet another embodiment", or "exemplary" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the exemplary description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine different embodiments or examples described in the present disclosure and the features of different embodiments or examples without contradiction.

[0152] The above only describes exemplary embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, and the like made within the spirit and principles of the present disclosure are included in the protection scope of the present disclosure.

Claims

1. A method for coating an electric core, comprising: controlling a film pulling mechanism to pull a coating film from a film roll and to unroll the coating film; controlling a pushing mechanism to push an electric core to be coated to move in a first direction at a first speed, so that a first face of the electric core abuts against the coating film; controlling the pushing mechanism to continue to push the electric core to move in the first direction at a second speed, and controlling a first roller assembly and a second roller assembly in a roller mechanism to respectively press against the coating film on both sides of the first face, so as to roll the coating film to a second face and a third face of the electric core; wherein the first speed is greater than the second speed.

2. The cell coating method of claim 1, wherein, The first speed comprises a first sub-speed and a second sub-speed, the first sub-speed is greater than the second sub-speed, and the second sub-speed is greater than the second speed. The controlling the pushing mechanism to push an electric core to be coated to move in a first direction at a first speed comprises: controlling the pushing mechanism to push the electric core to be coated to move in the first direction at the first sub-speed to a preset deceleration position; in response to the electric core reaching the preset deceleration position, controlling the pushing mechanism to push the electric core to move in the first direction at the second sub-speed, so that a first face of the electric core abuts against the coating film.

3. The cell coating method according to claim 1 or 2, wherein, Before the controlling the pushing mechanism to continue to push the electric core to move in the first direction at a second speed, and controlling a first roller assembly and a second roller assembly in a roller mechanism to respectively press against the coating film on both sides of the first face, the method further comprises: controlling the first roller assembly to move in a second direction to roll the coating film on the first face; or, controlling the second roller assembly to move in a third direction to roll the coating film on the first face, the second direction being opposite to the third direction.

4. The cell coating method according to any one of claims 1 to 3, wherein, The film pulling mechanism comprises a pulling assembly. The controlling a film pulling mechanism to pull a coating film from a film roll and to unroll the coating film comprises: controlling the pulling assembly to pull a leading end of the coating film on the film roll to release and unroll the coating film on the film roll; The method further comprises: during the controlling the pushing mechanism to continue to push the electric core to move in the first direction at a second speed, controlling the pulling assembly to move in a direction close to the electric core, so that the tension of the coating film remains constant during the rolling of the coating film.

5. The cell coating method of claim 4, wherein, During the controlling the pushing mechanism to continue to push the electric core to move in the first direction at a second speed, the pulling assembly, the first roller assembly and the second roller assembly perform three-axis interpolation motion.

6. The cell coating method according to any one of claims 1 to 5, wherein, The first roller assembly and the second roller assembly respectively press against the coating film on both sides of the first face with a first roller pressure and a second roller pressure; The method further comprises: obtaining historical coating parameters used in at least one historical coating process; wherein a historical electric core that has completed coating in the historical coating process meets a coating quality requirement; determining current coating parameters based on the historical coating parameters; the current coating parameters comprise at least one of the following: the first speed, the second speed, the first roller pressure and the second roller pressure.

7. The cell coating method of claim 6, wherein, The film quality requirement includes that a target quality parameter of the battery cell after the film coating satisfies a preset parameter condition, and the target quality parameter includes at least one of the following: a number of bubbles detected in the packaging film of the battery cell after the film coating, an area of the bubbles detected in the packaging film of the battery cell after the film coating, a thickness of the battery cell after the film coating, and a concave-convex degree of the battery cell after the film coating.

8. A battery cell film coating system, comprising: a film pulling mechanism configured to pull the packaging film from a film roll and to unfold the packaging film; a pushing mechanism configured to carry the battery cell to be coated and to push the battery cell to move in a first direction at a first speed so that a first surface of the battery cell abuts against the packaging film, and to push the battery cell to continue to move in the first direction at a second speed while abutting against the packaging film; wherein the first speed is greater than the second speed; a roller mechanism including a first roller assembly and a second roller assembly; during the process in which the pushing mechanism pushes the battery cell to continue to move in the first direction at the second speed while abutting against the packaging film, the first roller assembly and the second roller assembly respectively press against the packaging film located on both sides of the first surface to roll the packaging film to a second surface and a third surface of the battery cell.

9. The cell coating system of claim 8, wherein, The first speed includes a first sub-speed and a second sub-speed, the first sub-speed is greater than the second sub-speed, and the second sub-speed is greater than the second speed; The pushing mechanism is further configured to push the battery cell to be coated to move in the first direction at the first sub-speed to a preset deceleration position, and to push the battery cell to move in the first direction at the second sub-speed when the battery cell reaches the preset deceleration position, so that a first surface of the battery cell abuts against the packaging film.

10. The battery cell film coating system of claim 8 or 9, wherein The first roller assembly is further configured to move the packaging film on the first surface in a second direction before the pushing mechanism pushes the battery cell to continue to move in the first direction at the second speed. Alternatively, the second roller assembly is further configured to move the packaging film on the first surface in a third direction before the pushing mechanism pushes the battery cell to continue to move in the first direction at the second speed, and the second direction is opposite to the third direction. The film pulling mechanism includes a pulling assembly; 11. The cell coating system of any one of claims 8-10, wherein, The pulling assembly is configured to pull a leading end of the packaging film on the film roll to release and unfold the packaging film on the film roll; During the process in which the pushing mechanism pushes the battery cell to continue to move in the first direction at the second speed, the pulling assembly moves in a direction close to the battery cell, so that the tension of the packaging film remains constant during the rolling process of the packaging film. During the control of the pushing mechanism pushing the battery cell to continue to move in the first direction at the second speed, the pulling assembly, the first roller assembly, and the second roller assembly perform three-axis interpolation motion.

12. The cell coating system of claim 11, wherein, The first roller assembly and the second roller assembly respectively press against the packaging film located on both sides of the first surface with a first roller pressure and a second roller pressure.

13. The cell coating system of any one of claims 8-12, wherein, ​ The current coating parameters are determined based on historical coating parameters used in at least one historical coating process, wherein the current coating parameters include at least one of the first speed, the second speed, the first roller pressure, and the second roller pressure, and a historical battery cell that has completed the coating in the historical coating process meets a coating quality requirement.

14. The cell coating system of claim 13, wherein, The coating quality requirement includes that a target quality parameter of the coated battery cell meets a preset parameter condition, and the target quality parameter includes at least one of a number of bubbles detected in the coating film of the coated battery cell, an area of the bubbles detected in the coating film of the coated battery cell, a thickness of the coated battery cell, and a concave-convex degree of the coated battery cell.

Images