Packaging device and packaging method

Abstract

The present application relates to a packaging device and a packaging method. The packaging device comprises: a conveying mechanism, which is used for driving a first film material to move in a prearranged direction; a first film-laying mechanism, which is arranged on a moving path of the first film material and is used for forming on the first film material a plurality of accommodating positions that are arranged at intervals in the prearranged direction; and a second film-laying mechanism, which is used for laying a second film material onto an electrode assembly at each of the accommodating positions. In the present application, during the movement of the first film material, the first film-laying mechanism successively forms on the first film material in the prearranged direction the plurality of accommodating positions that are arranged at intervals, and then the second film-laying mechanism lays the second film material onto the electrode assembly at each of the accommodating positions, so that the first film material and the second film material jointly coat the electrode assembly. Thus, during the constant-speed movement of the first film material, the first film-laying mechanism can synchronously implement continuous shell punching and form the plurality of accommodating positions, thereby allowing for continuous production in electrode assembly packaging processes and improving production efficiency.

Description

Packaging device and packaging method

[0001] Cross-reference to related applications

[0002] This application is based on the Chinese Patent Application No. 202410711589X filed on June 3, 2024, entitled "Packaging device and packaging method", which is incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a packaging device and a packaging method. BACKGROUND

[0004] A battery cell is the smallest unit that constitutes a battery, and an electrode assembly, as a component that actually undergoes an electrochemical reaction in the battery cell, has an important influence on the overall performance of the battery cell. After the electrode assembly is completed, it needs to be subjected to isostatic pressing to achieve high density. Therefore, before isostatic pressing, the electrode assembly needs to be subjected to film packaging processing.

[0005] However, the current film packaging processing of the electrode assembly has low production efficiency, which affects the overall production efficiency of the battery.

[0006] SUMMARY

[0007] Based on this, the present application provides a packaging device and a packaging method.

[0008] In a first aspect, the present application provides a packaging device for packaging an electrode assembly, the packaging device comprising a conveying mechanism, a first film coating mechanism and a second film coating mechanism, the conveying mechanism being configured to drive a first film material to move along a predetermined direction; the first film coating mechanism being disposed on a moving path of the first film material and being configured to form a plurality of accommodation sites on the first film material along the predetermined direction; each of the accommodation sites being configured to accommodate the electrode assembly; the second film coating mechanism being disposed along the predetermined direction and being configured to cover a second film material on the electrode assembly in each of the accommodation sites, so that the first film material and the second film material form a package for the electrode assembly.

[0009] Through the above structure, the conveying mechanism drives the first film material to move at a constant speed along the predetermined direction. During the movement, the first film coating mechanism forms a plurality of accommodation sites on the first film material along the predetermined direction. In this way, a plurality of electrode assemblies can be placed in the accommodation sites in correspondence. Then, the second film coating mechanism covers the second film material on the electrode assembly in each of the accommodation sites, so that the first film material and the second film material form a package for the electrode assembly. Thus, the first film coating mechanism can continuously punch the shell and form a plurality of accommodation sites simultaneously during the constant-speed movement of the first film material, realizing continuous production of the electrode assembly packaging process and improving the production efficiency.

[0010] In some embodiments, each accommodating position is configured as an accommodating groove formed on the first film material in a preset direction. In this way, the accommodating groove can be used to accommodate and position the electrode assembly.

[0011] In some embodiments, the second film covering mechanism is used to lay the second film material on the first film material and cover the opening of each accommodating groove in which the electrode assembly is accommodated. When the electrode assembly is accommodated in the accommodating groove, the second film material can be directly laid on the first film material without the need for shell punching, thereby improving the efficiency.

[0012] In some embodiments, the first film covering mechanism includes a pressure roller assembly arranged on one side of the first film material. The pressure roller assembly can be pressed against the first film material and move relative to the first film material in a preset direction to roll and form each accommodating groove on the first film material.

[0013] By arranging the pressure roller assembly, the roll forming of each accommodating groove can be synchronized during the uniform movement of the first film material, thereby realizing continuous shell punching and improving the production efficiency.

[0014] In some embodiments, the first film covering mechanism includes a punching die arranged on at least one side of the first film material. The punching die moves relative to the first film material in a direction intersecting the first film material to punch and form each accommodating groove on the first film material.

[0015] By arranging the punching die, a plurality of continuous and spaced accommodating grooves can be punched and formed on the first film material, thereby realizing continuous shell punching and improving the production efficiency.

[0016] In some embodiments, the second film covering mechanism includes a unwinding assembly and a first film covering member. The second film material is wound on the unwinding assembly and connected to the first film covering member at one end. The first film covering member is used to continuously cover the electrode assembly in each accommodating position with the second film material in a preset direction.

[0017] Through the above structure, the continuous unwinding and covering of the second film material can be realized, thereby improving the film covering efficiency of the second film material and the overall production efficiency of the electrode assembly packaging process.

[0018] In some embodiments, the second film material includes a plurality of second film materials. The second film covering mechanism includes a second film covering member arranged on one side of the opening of each accommodating groove. The second film covering member is used to cover the electrode assembly in each accommodating position with each second film material one by one.

[0019] Through the above structure, each second film material can be correspondingly covered on the electrode assembly in each accommodating position, so that the second film material can be used together with the first film material to cover the electrode assembly in the accommodating groove, thereby realizing the film covering and packaging process.

[0020] In some embodiments, the second film covering mechanism further comprises a first follower in transmission connection with the second film covering member, the first follower being configured to drive the second film covering member to move synchronously with the first film material during the process of covering the second film material on each accommodating position.

[0021] By arranging the first follower, the second film covering member can be driven to move synchronously with the first film material, and the film covering of the second film material can be realized during the synchronous movement, without stopping the machine for film covering, thereby improving the production efficiency.

[0022] In some embodiments, the packaging device further comprises a first loading mechanism arranged between the first film covering mechanism and the second film covering mechanism along a preset direction, the first loading mechanism being configured to place the support member on the accommodating position.

[0023] By the above structure, the assembly and arrangement of the support member on the accommodating position can be realized, and the overall structural strength of the accommodating position is improved, so that the pressure received by the electrode assembly during the isostatic pressing process is more uniform after the electrode assembly is placed on the accommodating position and subjected to the film covering treatment.

[0024] In some embodiments, the packaging device further comprises a second follower in transmission connection with the first loading mechanism, the second follower being configured to drive the first loading mechanism to move synchronously with the first film material during the process of placing the support member.

[0025] By arranging the second follower, the first loading mechanism can be driven to move synchronously with the first film material, and the support member can be placed on the bottom of the accommodating position by the first loading mechanism during the synchronous movement, thereby realizing the follow-up feeding of the support member and improving the production efficiency.

[0026] In some embodiments, the packaging device further comprises a second loading mechanism arranged between the first loading mechanism and the second film covering mechanism along a preset direction, the second loading mechanism being configured to place the electrode assembly on the accommodating position and support the electrode assembly on the support member.

[0027] By the above structure, the automatic feeding of the electrode assembly can be realized during the synchronous movement of the first film material, thereby improving the production efficiency.

[0028] In some embodiments, the packaging device further comprises a third follower in transmission connection with the second loading mechanism, the third follower being configured to drive the second loading mechanism to move synchronously with the first film material during the process of placing the electrode assembly.

[0029] By arranging the third follower, the second loading mechanism can be driven to move synchronously with the first film material, and the electrode assembly can be placed into the accommodating position during the synchronous movement, thereby realizing the follow-up feeding of the electrode assembly and improving the production efficiency.

[0030] In some embodiments, the packaging device further comprises a first heat sealing mechanism arranged downstream of the second film coating mechanism along the preset direction, the first heat sealing mechanism being configured to heat seal the connecting edge between each two adjacent accommodation sites and the other edge adjacent to the connecting edge along the preset direction.

[0031] By arranging the first heat sealing mechanism, heat sealing between the first film material and the second film material can be achieved, so that the electrode assembly can be more stably accommodated in the accommodation site, and the electrode assembly is covered by the first film material and the second film material. In addition, the first heat sealing mechanism heat seals the connecting edge between each two adjacent accommodation sites and the other edge adjacent to the connecting edge, which can achieve the effect of heat sealing multiple edges at one time, thereby improving the production efficiency.

[0032] In some embodiments, the packaging device further comprises a fourth follower in transmission connection with the first heat sealing mechanism, the fourth follower being configured to drive the first heat sealing mechanism to move synchronously with the first film material during heat sealing.

[0033] By arranging the fourth follower, the first heat sealing mechanism can be driven to move synchronously with the first film material, and the heat sealing operation can be continuously performed during synchronous movement, so that non-stop heat sealing is achieved, thereby improving the production efficiency.

[0034] In some embodiments, the packaging device further comprises a cutting mechanism arranged downstream of the first heat sealing mechanism along the preset direction, the cutting mechanism being configured to cut the position between each two adjacent accommodation sites.

[0035] Through the above structure, the electrode assemblies after heat sealing and film covering can be cut between each other, so as to be independently formed, thereby facilitating subsequent operations.

[0036] In some embodiments, the packaging device further comprises an air extraction mechanism and a second heat sealing mechanism arranged downstream of the cutting mechanism along the preset direction, the air extraction mechanism being configured to extract vacuum in each accommodation site covered by the first film material and the second film material, and the second heat sealing mechanism being configured to heat seal the unsealed edge of the accommodation site after vacuum extraction.

[0037] Through the above structure, vacuum heat sealing in each accommodation groove can be achieved, and four-side packaging is completed, so that the electrode assembly can be more stably accommodated in the accommodation groove.

[0038] In a second aspect, the application further provides a packaging method, comprising the following steps:

[0039] controlling the first film material to move at a constant speed along the preset direction;

[0040] placing each electrode assembly on each accommodation site of the first film material along the preset direction in sequence and at intervals;

[0041] The second film material is covered on the electrode assemblies in each accommodating position to form a package for the electrode assemblies in each accommodating position by the first film material and the second film material.

[0042] In some embodiments, before the step of sequentially and intervally placing the electrode assemblies in each accommodating position on the first film material along the preset direction, the method further comprises the steps of:

[0043] The support is placed at the bottom of the corresponding accommodating position during the uniform movement of the first film material along the preset direction.

[0044] In some embodiments, after the step of covering the second film material on the electrode assemblies in each accommodating position to form a package for the electrode assemblies in each accommodating position by the first film material and the second film material, the method further comprises the steps of:

[0045] During the uniform movement of the electrode assemblies following the first film material and the second film material along the preset direction, the connecting edge between each two adjacent accommodating positions and the other edge adjacent to the connecting edge are heat-sealed along the preset direction;

[0046] The position between each two adjacent accommodating positions is cut off to separate the electrode assemblies;

[0047] The vacuumizing process is performed on the accommodating position from the opening between the first film material and the second film material, and the unsealed edge of the accommodating position after the vacuumizing process is heat-sealed.

[0048] The packaging device and the packaging method, by the conveying mechanism, drive the first film material to move uniformly along the preset direction. During the movement, the first film forming mechanism forms a plurality of accommodating positions on the first film material along the preset direction. In this way, a plurality of electrode assemblies can be placed in the accommodating positions. Then, the second film forming mechanism covers the second film material on the electrode assemblies in each accommodating position, so that the first film material and the second film material form a package for the electrode assemblies. Thus, the first film forming mechanism can continuously punch the shell and form a plurality of accommodating slots during the uniform movement of the first film material, realize the continuous production of the electrode assembly packaging process, and improve the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by the drawings without creative labor.

[0050] FIG. 1 is a structural schematic view of a packaging device according to one or more embodiments.

[0051] FIG. 2 is a structural schematic diagram of a packaging device according to one or more embodiments.

[0052] FIG. 3 is a structural schematic diagram of a packaging device according to one or more embodiments.

[0053] FIG. 4 is a structural schematic diagram of a packaging device according to one or more embodiments.

[0054] FIG. 5 is a flowchart of a packaging method according to one or more embodiments.

[0055] Reference signs: 100, packaging device; 200, electrode assembly; 300, first film material; 301, accommodation site; 400, second film material; 500, support; 10, first film covering mechanism; 20, second film covering mechanism; 30, first loading mechanism; 40, second loading mechanism; 50, first heat sealing mechanism; 60, cutting mechanism; 11, compression roller assembly; 12, stamping die; 21, unwinding assembly; 22, first film covering piece; 23, second film covering piece; a, preset direction. DETAILED DESCRIPTION

[0056] In order to make the above objectives, features and advantages of the present application more apparent, a detailed description of the specific embodiments of the present application will be given below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0057] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0058] In addition, if there are terms such as "first", "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0059] In the present application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on" or "below" the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is less than the second feature in horizontal height.

[0061] It should be noted that if an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for the purpose of description and do not represent the only implementation.

[0062] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system such as water power, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0063] A battery cell is the smallest unit that constitutes a battery, and in the structure of the battery cell, generally includes a case and an electrode assembly accommodated in the case, the electrode assembly being a component in which an electrochemical reaction actually occurs in the battery cell, and the case being wrapped around the outer periphery of the electrode assembly to form a sealed environment to protect the electrode assembly.

[0064] According to different manufacturing processes and structures, batteries can be divided into multiple categories, such as lithium ion batteries and solid-state batteries. Among them, the solid-state battery is a battery that uses solid electrodes and solid electrolytes. The solid-state battery uses a glass compound made of lithium or sodium as a conductive material, replacing the electrolyte of the previous lithium battery, which can greatly improve the energy density of the battery.

[0065] However, the solid-state battery also has some problems due to its structural characteristics. Among them, the solid-state battery needs to be pressed tightly with a large pressure due to its high interface impedance, that is, the isostatic pressing process is used to make it have high density.

[0066] Therefore, in order to isolate the hydraulic oil and prevent the hydraulic oil from contaminating the electrode assembly, it is necessary to encapsulate the electrode assembly before isostatic pressing.

[0067] The current film coating device is mostly applied to the aluminum-plastic film packaging process of soft-packaged battery cells, that is, a series of processes such as punching shell, cutting, entering shell, heat sealing, and vacuum extraction need to be carried out in sequence during the film coating process.

[0068] However, the above-mentioned aluminum-plastic film packaging process of soft-packaged battery cells is a step-by-step production process. The reason for this operation is that the aluminum-plastic film needs to be divided into upper and lower parts, and the aluminum-plastic film of the upper and lower parts needs to be punched to form a half groove respectively, and then the upper and lower parts of the aluminum-plastic film are covered to form a complete accommodation groove with two half grooves, so as to place the electrode assembly in the accommodation groove. Therefore, the aluminum-plastic film packaging process of soft-packaged battery cells needs to cut the aluminum-plastic film first, and then punch the shell by stamping.

[0069] In this way, when the above-mentioned aluminum-plastic film packaging process of soft-packaged battery cells is applied to the film coating process before the isostatic pressing of the electrode assembly, the process efficiency of the film coating and encapsulation of the electrode assembly is low, thereby affecting the overall production efficiency of the battery.

[0070] In view of the above, to solve the problem of low production efficiency in the process of coating and packaging the electrode assembly, one or more embodiments of the present application provide a packaging device. The first film material is uniformly moved along a predetermined direction by a conveying mechanism. During the movement, a plurality of accommodation positions are formed on the first film material along the predetermined direction by the first film coating mechanism. In this way, a plurality of electrode assemblies can be placed one by one in the accommodation positions. Then, the second film material is covered on the electrode assemblies in the accommodation positions by the second film coating mechanism, so that the first film material and the second film material jointly form a coating on the electrode assemblies. In this way, the first film coating mechanism can continuously punch the shell and form a plurality of accommodation positions during the uniform movement of the first film material, realize continuous production in the electrode assembly packaging process, and improve the production efficiency.

[0071] Referring to FIGS. 1 and 2, an embodiment of the present application provides a packaging device 100 for packaging an electrode assembly 200. The packaging device 100 includes a conveying mechanism (not shown in the figure), a first film coating mechanism 10, and a second film coating mechanism 20. The conveying mechanism is used to move a first film material 300 along a predetermined direction a. The first film coating mechanism 10 is arranged on the moving path of the first film material 300 and is used to form a plurality of accommodation positions 301 on the first film material 300, which are arranged along the predetermined direction a. Each accommodation position 301 is used to place an electrode assembly 200. The second film coating mechanism 20 is arranged along the predetermined direction a and is spaced apart from the first film coating mechanism 10. The second film coating mechanism 20 is used to cover a second film material 400 on the electrode assembly 200 in each accommodation position 301, so that the first film material 300 and the second film material 400 form a coating on the electrode assembly 200.

[0072] It should be noted that after the electrode assembly 200 is manufactured, it needs to be subjected to isostatic pressing to achieve high density. Specifically, the isostatic pressing requires that the electrode assembly 200 be placed in a sealed container, and that the liquid or gas medium uniformly transmit pressure to the electrode assembly 200 in all directions. Therefore, before isostatic pressing, the electrode assembly 200 needs to be coated to prevent external liquids from contaminating the electrode assembly 200. After the isostatic pressing of the electrode assembly 200 is completed, the film material coated on the outer periphery of the electrode assembly 200 can be removed, and then the electrode assembly 200 can be placed in a shell to assemble a battery cell.

[0073] The film material wrapped around the outer periphery of the electrode assembly 200 is usually an aluminum-plastic film, and the film wrapping process of the electrode assembly 200 currently mostly refers to the aluminum-plastic film packaging process of the soft-pack battery monomer. However, the aluminum-plastic film packaging process needs to first punch a shell and cut the aluminum-plastic film, and divide the aluminum-plastic film into two parts, and punch a shell for each part to form two half-grooves. When the electrode assembly 200 is placed in the aluminum-plastic film, the two half-grooves form a complete groove structure to wrap the electrode assembly 200 and complete the film wrapping process of the soft-pack battery monomer.

[0074] However, the aluminum-plastic film packaging process of the soft-pack battery monomer needs to punch a shell for each of the two parts of the cut aluminum-plastic film, and then assemble them to form a soft-pack battery monomer. When the aluminum-plastic film packaging process of the soft-pack battery monomer is applied to the film wrapping process before the isostatic pressing process of the electrode assembly 200, the production efficiency is low, which is not conducive to improving the overall production efficiency of the battery.

[0075] Therefore, the application provides a packaging device 100, which comprises a conveying mechanism, a first film covering mechanism 10, and a second film covering mechanism 20. The conveying mechanism is a structure that can drive the first film material 300 to move uniformly along a predetermined direction a. Specifically, the first film material 300 can be but is not limited to an aluminum-plastic film, and the predetermined direction a can be a horizontal direction.

[0076] The conveying mechanism can be but is not limited to a conveyor belt or a conveyor roller. The first film material 300 is placed on the conveying mechanism, and the conveying mechanism can drive the first film material 300 to move uniformly along the predetermined direction a.

[0077] The first film covering mechanism 10 is a structure that can punch the first film material 300 to form multiple accommodation positions 301 on the first film material 300. The first film covering mechanism 10 is arranged on the moving path of the first film material 300, that is, the position of the first film covering mechanism 10 is formed as a shell punching station. When the first film material 300 is moved to the shell punching station under the driving of the conveying mechanism, the first film covering mechanism 10 can punch the first film material 300 and form an accommodation position 301. With the continuous movement of the first film material 300, the first film covering mechanism 10 can continue to punch and form a second accommodation position 301 at a position apart from the first accommodation position 301 by a certain distance, and so on, so that multiple accommodation positions 301 are formed on the first film material 300 and arranged at intervals along the predetermined direction a.

[0078] The second film covering mechanism 20 refers to a structure capable of covering the second film material 400 on the electrode assembly 200 in each accommodation position 301 of the first film material 300, so that the second film material 400 and the first film material 300 together cover the electrode assembly 200 therein. Among them, the second film covering mechanism 20 is arranged downstream of the first film covering mechanism 10 along the preset direction a, that is, the position where the second film covering mechanism 20 is arranged forms a film covering station. Therefore, the electrode assembly 200 is first placed in each accommodation position 301 in turn, and when one of the accommodation positions 301 in which the electrode assembly 200 is placed moves to the film covering station, the second film covering mechanism 20 can cover the second film material 400 on the electrode assembly 200 in the accommodation position 301, so that the second film material 400 and the first film material 300 together cover the electrode assembly 200 in the accommodation position 301.

[0079] Further, the second film material 400 can be, but is not limited to, an aluminum plastic film, and the second film material 400 is laid in a planar manner on the upper surface of the first film material 300 to seal the openings of each accommodation position 301 on the first film material 300.

[0080] Through the above structure, the conveying mechanism drives the first film material 300 to move at a constant speed along the preset direction a, and in the moving process, the first film covering mechanism 10 forms a plurality of accommodation positions 301 spaced from each other on the first film material 300 along the preset direction a. In this way, a plurality of electrode assemblies 200 can be placed one by one in the accommodation positions 301, and then the second film covering mechanism 20 covers the second film material 400 on the electrode assembly 200 in each accommodation position 301, so that the first film material 300 and the second film material 400 together form a covering for the electrode assembly 200. Therefore, the first film covering mechanism 10 can realize continuous shell punching and form a plurality of accommodation positions 301 during the uniform movement of the first film material 300, realize continuous production of the electrode assembly 200 packaging process, and improve production efficiency.

[0081] In some embodiments, each accommodation position 301 is configured as an accommodation groove formed on the first film material 300 along the preset direction a. Therefore, the accommodation and positioning of the electrode assembly 200 can be realized through the accommodation groove.

[0082] In some embodiments, the second film covering mechanism 20 is used to lay the second film material 400 on the first film material 300 and cover the openings of each accommodation groove in which the electrode assembly 200 is accommodated.

[0083] When the electrode assembly 200 is accommodated in the accommodation groove, the second film material 300 can be directly laid on the first film material 400 without shell punching, thereby improving efficiency.

[0084] In some embodiments, the first film covering mechanism 10 comprises a roller assembly 11 arranged on one side of the first film 300, which is capable of pressing against the first film 300 and moving relative to the first film 300 in a preset direction a, for rolling and forming each accommodating groove on the first film 300.

[0085] Specifically, the first film 300 is arranged horizontally and moves uniformly in the horizontal direction. The roller assembly 11 is arranged above the first film 300 in the vertical direction, and the roller assembly 11 can be but is not limited to a roller cylinder. The roller cylinder is rotatably arranged around its own axis, and controls the roller cylinder to roll and press the first film 300 below to form one downwardly recessed accommodating groove on the first film 300. At the same time, the first film 300 can still move uniformly in the preset direction a during the rolling process. The roller cylinder rolls and presses the first film 300 while the first film 300 moves, and after the rolling is completed, the roller cylinder is controlled to move upward to separate from the first film 300, and one accommodating groove is processed.

[0086] Further, after the first film 300 moves in the preset direction a for a certain time, the roller cylinder is pressed again to roll and form a second accommodating groove on the first film 300, and so on. In this way, the roller cylinder can roll and form a plurality of accommodating grooves arranged at intervals in the preset direction a on the first film 300.

[0087] Therefore, by arranging the roller assembly 11, the rolling and forming of each accommodating groove can be synchronized during the uniform movement of the first film 300, and continuous shell punching can be realized to improve production efficiency.

[0088] As shown in FIG. 3 and FIG. 4, in some embodiments, the first film covering mechanism 10 comprises a punching die 12 arranged on at least one side of the first film 300, which moves relative to the first film 300 in a direction intersecting the first film 300, for punching and forming each accommodating groove on the first film 300.

[0089] Specifically, the punching die 12 refers to a structure capable of performing a punching operation on the first film 300 to recess and form an accommodating groove on the first film 300. The punching die 12 is arranged to match the size of the accommodating groove, and presses the first film 300 from both sides to the middle in the vertical direction, so as to recess and form an accommodating groove on the first film 300.

[0090] When the punching die 12 is used to punch the first film 300, the first film 300 can be controlled to stop moving, or the punching die 12 can be driven to move synchronously with the first film 300 to realize follow-up punching. Both of the above-mentioned ways can continuously form a plurality of accommodating grooves on the first film 300 by the punching die 12, which will not be described herein.

[0091] By setting the stamping die 12, a plurality of accommodating grooves can be formed on the first film material 300, and continuous shell stamping can be realized, thereby improving production efficiency.

[0092] Please refer to FIG. 1 and FIG. 3, in some embodiments, the second film covering mechanism 20 includes a unwinding assembly 21 and a first film covering member 22, the second film material 400 is wound on the unwinding assembly 21, and one end is connected to the first film covering member 22, the first film covering member 22 is used to continuously cover the second film material 400 on the electrode assembly 200 in each accommodating position 301 along the preset direction a.

[0093] Specifically, the second film material 400 can be set as a continuous roll, the unwinding assembly 21 refers to a structure capable of performing unwinding operation on the roll of the second film material 400, and the first film covering member 22 refers to a structure capable of pressing the second film material 400 after unwinding to the first film material 300, and making the second film material 400 cover the opening of each accommodating groove.

[0094] The unwinding assembly 21 can include a plurality of unwinding rollers, and the first film covering member 22 can be set as a film covering roller, the second film material 400 is wound on each unwinding roller in turn, and one end of the second film material 400 is connected to the film covering roller. The unwinding of the second film material 400 is realized by the unwinding rollers, and at the same time, the film covering roller can continuously press the second film material 400 to the first film material 300, so that the second film material 400 can cover the opening of each accommodating groove.

[0095] Through the above structure, continuous unwinding and continuous film covering of the second film material 400 can be realized, the film covering efficiency of the second film material 400 is improved, and the overall production efficiency of the electrode assembly 200 packaging process is improved.

[0096] As shown in FIG. 2 and FIG. 4, in some embodiments, the second film material 400 includes a plurality of second film covering members 23 arranged at the opening side of each accommodating groove, and the second film covering member 23 is used to cover each second film material 400 on the electrode assembly 200 in each accommodating position 301 one by one.

[0097] Specifically, the second film material 400 includes a plurality of second film materials 400, that is, the second film material 400 can be set as a sheet structure, so that each second film material 400 can be correspondingly covered at the opening of each accommodating groove.

[0098] The second film covering member 23 can be set as a pressing plate arranged above the first film material 300 in the vertical direction, when one of the accommodating grooves on the first film material 300 moves to the film covering station, the pressing plate presses the second film material 400 downward to the first film material 300, so that the second film material 400 can cover the opening of the accommodating groove, and the first film material 300 can together wrap the electrode assembly 200 in the accommodating groove.

[0099] Through the above structure, each second film material 400 can be correspondingly covered on the opening of each accommodating groove, so that the second film material 400 can be collectively wrapped with the first film material 300 to realize the film wrapping and packaging process.

[0100] In some embodiments, the second film covering mechanism 20 further comprises a first follower (not shown in the figure) in transmission connection with the second film covering member 23, and the first follower is used to drive the second film covering member 23 to move synchronously with the first film material 300 during the process of covering the second film material 400 on each accommodating position 301.

[0101] Specifically, the first follower refers to a structure capable of driving the second film covering member 23 to move synchronously with the first film material 300 along the preset direction a. The first follower can be but is not limited to a servo module or a robot, so that when the second film covering member 23 performs the film covering operation, the first follower can drive the second film covering member 23 to move synchronously with the first film material 300, and realize the film covering of the second film material 400 during the synchronous movement, without stopping the machine for film covering, thereby improving the production efficiency.

[0102] Through the setting of the first follower, the second film covering member 23 can be driven to move synchronously with the first film material 300, and the film covering of the second film material 400 can be realized during the synchronous movement, without stopping the machine for film covering, thereby improving the production efficiency.

[0103] In some embodiments, the packaging device 100 further comprises a first loading mechanism 30 arranged between the first film covering mechanism 10 and the second film covering mechanism 20 along the preset direction a, and the first loading mechanism 30 is used to place the support 500 on the accommodating position 301.

[0104] Specifically, the support 500 can include a steel plate or other support structure, and the first loading mechanism 30 can include a mechanical arm or a gripper, and the first loading mechanism 30 is arranged above the first film material 300 along the vertical direction.

[0105] When one of the accommodating grooves on the first film material 300 moves to a position corresponding to the first loading mechanism 30, the first loading mechanism 30 can clamp the steel plate and place the steel plate on the bottom of the accommodating groove, so as to improve the overall structural strength of the accommodating groove through the steel plate, so that the electrode assembly 200 can be more stably placed in the accommodating groove, and the pressure applied to the electrode assembly 200 during the isostatic pressing process after film wrapping is more uniform, and the electrode assembly can be prevented from being deformed under pressure.

[0106] Through the above structure, the assembly and arrangement of the support 500 in the accommodating groove can be realized, the overall structural strength of the accommodating groove is improved, so that the pressure received by the electrode assembly 200 during the isostatic pressing process after the electrode assembly 200 is placed in the accommodating groove and subjected to the film wrapping process is more uniform.

[0107] In some embodiments, the packaging device 100 further comprises a second follower (not shown in the figure) in transmission connection with the first loading mechanism 30, the second follower being configured to drive the first loading mechanism 30 to move synchronously with the first film 300 during the placement of the support 500.

[0108] Specifically, the second follower refers to a structure capable of driving the first loading mechanism 30 to move synchronously with the first film 300 in the preset direction a. The second follower can be, but is not limited to, a servo module or a robot. Thus, after the first loading mechanism 30 clamps the support 500, the second follower can drive the first loading mechanism 30 and the support 500 thereon to move synchronously with the first film 300, and place the support 500 at the bottom of the accommodating groove during the synchronous movement, thereby achieving the synchronous loading of the support 500.

[0109] By providing the second follower, the first loading mechanism 30 can be driven to move synchronously with the first film 300, and the support 500 can be placed at the bottom of the accommodating groove by the first loading mechanism 30 during the synchronous movement, thereby achieving the synchronous loading of the support 500 and improving the production efficiency.

[0110] In some embodiments, the packaging device 100 further comprises a second loading mechanism 40 arranged between the first loading mechanism 30 and the second film covering mechanism 20 in the preset direction a, the second loading mechanism 40 being configured to place the electrode assembly 200 in the accommodating position 301 and support the electrode assembly 200 on the support 500.

[0111] Specifically, the second loading mechanism 40 can include a mechanical arm or a gripper, and the second loading mechanism 40 is arranged above the first film 300 in the vertical direction.

[0112] When one of the accommodating grooves on the first film 300 moves to a position corresponding to the second loading mechanism 40, the second loading mechanism 40 can clamp the electrode assembly 200 and place the electrode assembly 200 into the accommodating groove, and support the electrode assembly 200 on the support.

[0113] With the continuous movement of the first film 300, the second loading mechanism 40 can continuously clamp multiple electrode assemblies 200 and sequentially place each electrode assembly 200 into the corresponding accommodating groove, thereby achieving the automatic loading of the electrode assemblies 200.

[0114] Through the above structure, the automatic loading of the electrode assemblies 200 can be achieved during the synchronous movement of the first film 300, thereby improving the production efficiency.

[0115] In some embodiments, the packaging device 100 further comprises a third follower (not shown in the figure) in transmission connection with the second loading mechanism 40, the third follower being used to drive the second loading mechanism 40 to move synchronously with the first film material 300 during the process of placing the electrode assembly 200.

[0116] Specifically, the third follower refers to a structure capable of driving the second loading mechanism 40 to move synchronously with the first film material 300 along the preset direction a. The third follower can be, but is not limited to, a servo module or a robot. Thus, after the second loading mechanism 40 clamps the electrode assembly 200, the third follower can drive the second loading mechanism 40 and the electrode assembly 200 thereon to move synchronously with the first film material 300, and place the electrode assembly 200 into the accommodation groove during the synchronous movement.

[0117] By setting the third follower, the second loading mechanism 40 can be driven to move synchronously with the first film material 300, and the electrode assembly 200 can be placed into the accommodation groove during the synchronous movement, realizing the follow-up feeding of the electrode assembly 200 and improving the production efficiency.

[0118] In some embodiments, the packaging device 100 further comprises a first heat sealing mechanism 50 arranged downstream of the second film covering mechanism 20 along the preset direction a, the first heat sealing mechanism 50 being used to heat seal the connecting edge between every two adjacent accommodation positions 301 and another edge adjacent to the connecting edge along the preset direction a.

[0119] Specifically, after the second film covering mechanism 20 covers the second film material 400 on the first film material 300, the first heat sealing mechanism 50 can heat seal between the first film material 300 and the second film material 400. The specific position of the first heat sealing mechanism 50 for heat sealing is the position of the connecting edge between every two adjacent accommodation grooves and another edge adjacent to the connecting edge along the preset direction a. That is, the first heat sealing mechanism 50 can realize three-edge heat sealing of the accommodation position 301.

[0120] Since the accommodation grooves are continuously and intermittently arranged on the first film material 300, when the first heat sealing mechanism 50 heat seals the connecting edge between every two adjacent accommodation grooves and another edge adjacent to the connecting edge, it can simultaneously realize heat sealing of one end of the accommodation groove on the left and right sides and heat sealing of another edge adjacent to the left and right sides, that is, heat sealing of three edges at one time.

[0121] Further, the first heat sealing mechanism 50 can comprise a heat sealing head, and the heat sealing head can comprise a plurality of groups. The plurality of groups of heat sealing heads can simultaneously realize multi-point heat sealing, further improving the production efficiency.

[0122] Taking two groups of heat sealing heads as an example, when two groups of heat sealing heads are arranged, when one of the accommodation grooves moves to a position corresponding to the hot air station, the two groups of heat sealing heads correspond to the opposite ends of the accommodation groove along the preset direction a, that is, the opposite ends of the accommodation groove along the preset direction a can be simultaneously heat sealed. Of course, in actual application, the heat sealing head can also be arranged as one group or multiple groups, and the specific number can be adjusted according to actual needs, which will not be described here.

[0123] By arranging the first heat sealing mechanism 50, heat sealing between the first film material 300 and the second film material 400 can be realized, so that the electrode assembly 200 can be more stably accommodated in the accommodation groove, and the electrode assembly 200 is covered by the first film material 300 and the second film material 400. In addition, the first heat sealing mechanism 50 heat seals at the interval position between every two adjacent accommodation grooves, which can realize the effect of heat sealing both sides at one time and improve the production efficiency.

[0124] In some embodiments, the packaging device 100 further comprises a fourth follower (not shown in the figure) in transmission connection with the first heat sealing mechanism 50, and the fourth follower is used to drive the first heat sealing mechanism 50 to move synchronously with the first film material 300 during heat sealing.

[0125] It should be noted that when performing heat sealing operation, it is usually necessary to maintain heat pressure for a period of time to realize stable heat sealing of the first film material 300 and the second film material 400. For example, after the heat sealing head contacts the first film material 300 and the second film material 400, it needs to be maintained for 3-5s or even longer time to ensure that the first film material 300 and the second film material 400 are tightly connected, and then the heat sealing head can be released.

[0126] Therefore, the fourth follower can drive the first heat sealing mechanism 50 to move synchronously with the first film material 300, so that the first heat sealing mechanism 50 can realize non-stop heat sealing and improve the production efficiency.

[0127] Further, the fourth follower can be but not limited to a servo module or a robot. By arranging the fourth follower, the first heat sealing mechanism 50 can be driven to move synchronously with the first film material 300, and the heat sealing operation can be continuously performed during synchronous movement, realizing non-stop heat sealing and improving the production efficiency.

[0128] In some embodiments, the packaging device 100 further comprises a cutting mechanism 60 arranged downstream of the first heat sealing mechanism 50 along the preset direction a, and the cutting mechanism 60 is used to cut the position between every two adjacent accommodation positions 301.

[0129] Specifically, the cutting mechanism 60 refers to a structure that can cut the first film material 300 and the second film material 400 after heat sealing, so that the electrode assembly 200 in each accommodation groove can be formed individually.

[0130] Further, the cutting mechanism 60 can include a cutter. First, the interval position between each adjacent two accommodating grooves is heat-sealed by the heat-sealing head, and then the heat-sealed position is cut by the cutter, so that the electrode assembly 200 in each accommodating groove can be individually film-molded, to facilitate the isostatic pressing treatment of the electrode assembly 200 after film-molding.

[0131] Through the above structure, the heat-sealed and film-molded electrode assemblies 200 can be cut and independently molded, to facilitate subsequent operations.

[0132] In some embodiments, the packaging device 100 further includes a vacuumizing mechanism (not shown in the figure) and a second heat-sealing mechanism (not shown in the figure) arranged downstream of the cutting mechanism 60 along the preset direction a, the vacuumizing mechanism is used to vacuumize each accommodating position 301 covered by the first film material 300 and the second film material 400, and the second heat-sealing mechanism is used to heat-seal the unsealed edge of the accommodating position 301 after vacuumizing.

[0133] It should be noted that, in the process of heat-sealing by the first heat-sealing mechanism 50, only the three edges of each accommodating groove are heat-sealed along the preset direction a, that is, one end of each accommodating groove is still in an open state.

[0134] Therefore, after cutting, each accommodating groove is vacuumized by the vacuumizing mechanism, and the remaining one end of the accommodating groove after vacuumizing is heat-sealed by the second heat-sealing mechanism, so that a sealed space is formed in the accommodating groove.

[0135] Through the above structure, the vacuumizing and heat-sealing of each accommodating groove can be realized, and four-side packaging is completed, so that the electrode assembly 200 is more stably accommodated in the accommodating groove.

[0136] As shown in FIG. 5, based on the same concept as the above packaging device 100, the present application further provides a packaging method, including the following steps:

[0137] S10: control the first film material 300 to move at a constant speed along the preset direction a.

[0138] Specifically, the first film material 300 can be placed on the conveying mechanism, and the first film material 300 is driven by the conveying mechanism to move at a constant speed along the preset direction a.

[0139] S30: place each electrode assembly 200 on each accommodating position 301 of the first film material 300 along the preset direction a in sequence and at intervals.

[0140] When the first film material 300 moves at a constant speed along the preset direction a, the first film covering mechanism 10 can press or stamp a plurality of accommodating grooves on the first film material 300. Specifically, the first film covering mechanism 10 first presses or stamps a first accommodating groove on the first film material 300, and then the first film covering mechanism 10 is separated from the first film material 300. After the first film material 300 continues to move along the preset direction a for a distance, the first film covering mechanism 10 is controlled again to press or stamp a second accommodating groove on the first film material 300, and so on. In this way, a plurality of accommodating grooves for accommodating the electrode assemblies 200 are formed on the first film material 300 along the preset direction a.

[0141] S40: The second film material 400 is arranged on the electrode assembly 200 in each accommodating position 301 to form a covering for the electrode assembly 200 in each accommodating position 301 by the first film material 300 and the second film material 400.

[0142] When the electrode assemblies 200 are placed one by one into the accommodating grooves, the second film material 400 is arranged on the first film material 300, and the second film material 400 covers the openings of the accommodating grooves, so that the first film material 300 and the second film material 400 jointly form a covering for the electrode assemblies 200 in the accommodating grooves.

[0143] In some embodiments, before the step S30, the method further comprises the step of:

[0144] S20: During the movement of the first film material 300 along the preset direction a, the support is placed at the bottom of the corresponding accommodating position 301.

[0145] Specifically, the support can be a steel plate. During the movement of the first film material 300 at a constant speed, the steel plate is first clamped by the first loading mechanism 30, and the first loading mechanism 30 and the steel plate thereon are driven by the second follower to move synchronously with the first film material 300. During this process, the first loading mechanism 30 can place the steel plate into the bottom of the corresponding accommodating groove, realizing the follow-up feeding of the steel plate.

[0146] After the steel plate is placed in the corresponding accommodating groove, the electrode assembly 200 is clamped by the second loading mechanism 40, and the second loading mechanism 40 and the electrode assembly 200 thereon are driven by the third follower to move synchronously with the first film material 300. During this process, the second loading mechanism 40 can place the electrode assembly 200 into the corresponding accommodating groove, and support the electrode assembly 200 on the corresponding steel plate, realizing the follow-up feeding of the electrode assembly 200.

[0147] It should be noted that the process of placing the support and the electrode assembly 200 can be synchronized, that is, after placing the support in the first accommodating groove, the first film material 300 continues to move to the position corresponding to the first loading mechanism 30 in the second accommodating groove, and then the first loading mechanism 30 places the support in the second accommodating groove. At the same time, the first accommodating groove has moved to the position corresponding to the second loading mechanism 40, and then the second loading mechanism 40 can simultaneously place the electrode assembly 200 into the first accommodating groove, thereby improving the overall production efficiency.

[0148] In some embodiments, after the step S40, the method further comprises the step of:

[0149] S50: In the process that the electrode assembly 200 follows the first film material 300 and the second film material 400 to move at a constant speed along the preset direction a, the connecting edge between each adjacent two accommodating positions 301 and the other edge adjacent to the connecting edge are heat sealed along the preset direction a.

[0150] After the film coating of the second film material 400 is completed, the first film material 300 and the second film material 400 jointly coat the electrode assembly 200 in the corresponding accommodating groove. At this time, the first film material 300 and the second film material 400 continue to move at a constant speed along the preset direction a. The fourth follower drives the first heat sealing mechanism 50 to move synchronously with the first film material 300 and the second film material 400, and in the process, the three edges of the accommodating groove are heat sealed, so that the first film material 300 and the second film material 400 can stably coat the outer periphery of the electrode assembly 200.

[0151] S60: The position between each adjacent two accommodating positions 301 is cut off, so that each electrode assembly 200 is formed separately.

[0152] Further, after the heat sealing of the first heat sealing mechanism 50 is completed, the cutting mechanism 60 cuts the heat sealed position, that is, the interval position between each adjacent two accommodating grooves, so that each electrode assembly 200 can be formed separately after being coated.

[0153] It should be noted that the heat sealing process and the cutting process can also be performed simultaneously. Specifically, after the first heat sealing mechanism 50 completes the heat sealing of the first accommodating groove, the first film material 300 and the second film material 400 continue to move at a constant speed along the preset direction a until the second accommodating groove corresponds to the first heat sealing mechanism 50, and then the first heat sealing mechanism 50 can heat seal the corresponding position of the second accommodating groove. At the same time, the first accommodating groove has moved to the position corresponding to the cutting mechanism 60, and then the cutting mechanism 60 can simultaneously cut.

[0154] S70: Perform vacuumizing on the accommodating position 301 from the opening between the first film material 300 and the second film material 400, and perform heat sealing on the unsealed edge of the accommodating position 301 after vacuumizing.

[0155] The first heat sealing mechanism 50 performs heat sealing on three edges of the accommodating groove, and after cutting, the air extracting mechanism performs vacuumizing on each accommodating groove, and the second heat sealing mechanism performs heat sealing on the remaining one end of the accommodating groove after vacuumizing, so as to realize four-edge heat sealing of the accommodating groove, so as to form a sealed environment for the accommodating groove.

[0156] Through the above structure and method, continuous encapsulation of the electrode assembly 200 can be realized, the production efficiency in the encapsulation process of the electrode assembly 200 is improved, and the overall production efficiency of the battery is improved.

[0157] The technical features of the above-described embodiments can be combined in any manner. To make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as within the scope of the present disclosure.

[0158] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A packaging device for packaging electrode assemblies, the device comprising: a conveying mechanism configured to move a first film along a predetermined direction; a first film covering mechanism disposed on a moving path of the first film and configured to form a plurality of accommodating positions on the first film along the predetermined direction, each of the accommodating positions being configured to accommodate an electrode assembly; and a second film covering mechanism disposed along the predetermined direction and spaced apart from the first film covering mechanism, the second film covering mechanism being configured to cover a second film on the electrode assembly in each of the accommodating positions, so that the first film and the second film form a package for the electrode assembly.

2. The packaging device of claim 1, wherein, Each of the accommodating positions is configured as an accommodating groove formed on the first film along the predetermined direction.

3. The packaging device of claim 2, wherein, The second film covering mechanism is configured to lay the second film on the first film and cover an opening of each of the accommodating grooves accommodating the electrode assembly.

4. The packaging device according to claim 2 or 3, wherein, The first film covering mechanism comprises a roller assembly disposed on one side of the first film, the roller assembly being configured to press against the first film and move relative to the first film along the predetermined direction, so as to roll-form each of the accommodating grooves on the first film.

5. The packaging device according to any one of claims 2-4, wherein, The first film covering mechanism comprises a stamping die disposed on at least one side of the first film, the stamping die being configured to move relative to the first film in a direction intersecting the first film, so as to stamp-form each of the accommodating grooves on the first film.

6. The packaging device according to any one of claims 1 to 5, wherein, The second film covering mechanism comprises a film unwinding assembly and a first film covering member, the second film being wound on the film unwinding assembly and connected to the first film covering member at one end, the first film covering member being configured to continuously cover the second film on the electrode assembly in each of the accommodating positions along the predetermined direction.

7. The packaging device according to any one of claims 1 to 6, wherein, The second film covering mechanism comprises a second film covering member disposed on one side of the opening of each of the accommodating grooves, the second film covering member being configured to cover each of the second films on the electrode assembly in each of the accommodating positions.

8. The packaging device of claim 7, wherein, The second film covering mechanism further comprises a first follower in transmission connection with the second film covering member, the first follower being configured to move the second film covering member synchronously with the first film during the covering of the second film on each of the accommodating positions.

9. The packaging device according to any one of claims 1 to 8, wherein, The packaging device further comprises a first loading mechanism disposed along the predetermined direction between the first film covering mechanism and the second film covering mechanism, the first loading mechanism being configured to place a support in the accommodating position.

10. The packaging device of claim 9, wherein, The packaging device further comprises a second follower in transmission connection with the first loading mechanism, the second follower being configured to move the first loading mechanism synchronously with the first film during the placing of the support.

11. The packaging device according to claim 9 or 10, wherein The packaging device further comprises a second loading mechanism disposed along the predetermined direction between the first loading mechanism and the second film covering mechanism, the second loading mechanism being configured to place the electrode assembly in the accommodating position and support the electrode assembly on the support.

12. The packaging device of claim 11, wherein, The packaging device further comprises a third follower in transmission connection with the second loading mechanism, which is used to drive the second loading mechanism to move synchronously with the first film during the placement of the electrode assembly.

13. The packaging device according to any one of claims 1 to 12, wherein, The packaging device further comprises a first heat sealing mechanism arranged downstream of the second film covering mechanism along the preset direction, which is used to heat seal the connecting edge between every two adjacent accommodation sites and another edge adjacent to the connecting edge along the preset direction.

14. The packaging device of claim 13, wherein, The packaging device further comprises a fourth follower in transmission connection with the first heat sealing mechanism, which is used to drive the first heat sealing mechanism to move synchronously with the first film during heat sealing.

15. The packaging device of claim 14, wherein, The packaging device further comprises a cutting mechanism arranged downstream of the first heat sealing mechanism along the preset direction, which is used to cut the position between every two adjacent accommodation sites.

16. The packaging device of claim 15, wherein, The packaging device further comprises an air extraction mechanism and a second heat sealing mechanism arranged downstream of the cutting mechanism along the preset direction, the air extraction mechanism is used to extract air from each accommodation site covered by the first film and the second film, and the second heat sealing mechanism is used to heat seal the unsealed edge of the accommodation site after air extraction.

17. A packaging method, comprising the following steps: controlling the first film to move at a constant speed along a preset direction; placing each electrode assembly on each accommodation site of the first film along the preset direction in sequence and at intervals; covering each electrode assembly on each accommodation site with a second film to form a package for the electrode assembly in each accommodation site by the first film and the second film.

18. The packaging method of claim 17, wherein, Before the step of placing each electrode assembly on each accommodation site of the first film along the preset direction in sequence and at intervals, the method further comprises the following step: placing the support at the bottom of the corresponding accommodation site during the movement of the first film along the preset direction at a constant speed.

19. The packaging method according to claim 17 or 18, wherein, After the step of covering each electrode assembly on each accommodation site with a second film to form a package for the electrode assembly in each accommodation site by the first film and the second film, the method further comprises the following steps: heat sealing the connecting edge between every two adjacent accommodation sites and another edge adjacent to the connecting edge along the preset direction during the movement of the electrode assembly, the first film and the second film along the preset direction at a constant speed; cutting the position between every two adjacent accommodation sites to form each electrode assembly separately; extracting air from each accommodation site through the opening between the first film and the second film, and heat sealing the unsealed edge of the accommodation site after air extraction.

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