A device for lithium battery module bottom film pasting

Abstract

The application provides a device for bottom film pasting of a lithium battery module, comprising a first storage mechanism and a second storage mechanism for storing the film, and a first blocking mechanism arranged between the first storage mechanism and the second storage mechanism; the device further comprises a film pulling mechanism reciprocating along a preset straight line, and the film pulling mechanism and the second storage mechanism jointly act on the film and are configured to adjust the tension of the film released by the second storage mechanism at each position so as to make the tension of the released film at each position uniform; a second blocking mechanism is arranged between the second storage mechanism and the film pulling mechanism, a pressing roller assembly reciprocating along the direction of the preset straight line is arranged below the film pulling mechanism, and a cutting mechanism is further included. The device can ensure that the film pulling mechanism is not skewed when the film is pulled out, and the film pulling direction is adjusted in real time, and the tension of the film at each position can be kept uniform during the adjustment process, so that the deformation of the film before pasting is effectively controlled to prevent excessive deformation, and the labor intensity of the operator can be effectively reduced.

Description

Technical Field

[0001] This invention generally relates to the field of lithium battery technology. More specifically, this invention relates to an apparatus for attaching a film to the bottom of a lithium battery module. Background Technology

[0002] A battery cell refers to a single electrochemical cell containing both a positive and a negative electrode. It is generally not used directly. The battery cell is the smallest unit of a power battery and also an energy storage unit. It must have a high energy density to store as much energy as possible, enabling electric vehicles to have a longer driving range. When multiple battery cells are packaged together in the same housing frame and connected to the outside through a unified boundary, this forms a module. Typically, a lithium battery module consists of several to hundreds of battery cells connected in parallel and / or series. When several lithium battery modules are jointly controlled or managed by a battery management system and a thermal management system, this unified whole is called a lithium battery pack system. The formation of a lithium battery pack system involves three processes: processing, assembly, and packaging on a PACK assembly line. Therefore, a lithium battery module can be understood as an intermediate product between the battery cell and the PACK, formed by combining lithium battery cells in series and / or parallel, and adding a single-cell monitoring and management system and a thermal management system. The structure of the lithium battery module must provide support, fixation, and protection for the battery cells.

[0003] Before lithium battery modules are assembled on the PACK line, an insulating film needs to be pasted on the bottom of the lithium battery modules to prevent surface scratches and leakage during subsequent transportation and assembly. The usual process is to pull the insulating film to the film-applying station and apply the film to the bottom of the lithium battery module, thus providing insulation, leakage prevention, moisture protection, and scratch protection. Existing film-applying equipment cannot guarantee uniform tension of the film before application, and the film is prone to skew during the pulling process. These two factors lead to air bubbles, wrinkles, and even tearing of the film after it is applied to the bottom of the lithium battery module, rendering the film ineffective. In addition, the film is prone to skew immediately after being pulled out, for example, if the clamping jaws skew while holding the film. If this skew is not corrected in time, the tension of the film will remain uneven throughout the process of clamping and pulling out the film, causing the film to deform. All of the above situations require timely adjustments. However, it is difficult for operators to identify and judge whether the film is skewed by observing the moment the film is pulled out. Even if operators can make special adjustments to the film skew during the film pulling process, in addition to increasing the labor intensity of operators and affecting the production capacity of the film application station, it is still impossible to guarantee uniform tension of the film throughout the entire film supply process.

[0004] In view of this, there is an urgent need to provide a device for applying a film to the bottom of a lithium battery module to solve the problem. Summary of the Invention

[0005] In order to at least solve one or more of the technical problems mentioned in the background art, the present invention proposes an apparatus for applying a film to the bottom of a lithium battery module.

[0006] Therefore, the present invention provides the following technical solution.

[0007] This invention discloses an apparatus for attaching a film to the bottom of a lithium battery module, comprising: a first storage mechanism and a second storage mechanism for storing the film; the first storage mechanism is used to provide the film to the second storage mechanism to transfer the film stored in the first storage mechanism to the second storage mechanism; the second storage mechanism is used to unfold the film before attaching it to the bottom of the lithium battery module; a first blocking mechanism is provided between the first storage mechanism and the second storage mechanism to restrict the first storage mechanism from providing the film to the second storage mechanism when the second storage mechanism releases the stored film; and a film pulling mechanism that reciprocates along a preset straight line, the film pulling mechanism being used to clamp the film released by the second storage mechanism and pull the film out of the second storage mechanism, so that the second storage mechanism releases the stored film. The film pulling mechanism and the second storage mechanism are mutually exclusive. The combined function of the membranes is configured to adjust the tension of the membrane released by the second storage mechanism to ensure uniform tension at all points of the released membrane. A second blocking mechanism is provided between the second storage mechanism and the membrane pulling mechanism to prevent the membrane near the membrane pulling mechanism from retracting into the second storage mechanism when the second storage mechanism stores and unfolds the membrane. A lithium battery module is disposed on the upper side of the membrane pulling mechanism, and a pressure roller assembly that reciprocates along the direction of the preset straight line is provided below the membrane pulling mechanism. The membrane released by the second storage mechanism is located between the lithium battery module and the pressure roller assembly, and the pressure roller assembly is used to attach the membrane released by the second storage mechanism to the bottom of the lithium battery module. A cutting mechanism is also included to cut the membrane so that the membrane attached to the bottom of the lithium battery module is separated from the membrane released by the second storage mechanism.

[0008] Preferably, the first storage mechanism includes a shaft and a winding drum disposed on the shaft, the winding drum being used to wind the film, and further includes a braking element for restricting the rotation of the winding drum to stop releasing the film to the second storage mechanism. The braking element is configured to apply pressure to both ends of the winding drum and to generate friction between the winding drum and the braking element when the winding drum rotates. The braking element is also configured to adjust the pressure applied to both ends of the winding drum. The shaft of the first storage mechanism is fixedly connected to the output end of a first drive mechanism for moving the shaft along its axial direction. When the first storage mechanism transfers the film to the second storage mechanism, the first drive mechanism drives the shaft to move along its axial direction to adjust the film exit direction of the film wound on the winding drum to be the same as the direction of the preset straight line. The first storage mechanism and the first drive mechanism are detachably connected to a fixing frame.

[0009] Preferably, the second storage mechanism includes multiple fixed rollers and multiple movable rollers. A movable roller is positioned between every two fixed rollers along the direction of the preset straight line, allowing the film to be sequentially wound around the spaced fixed and movable rollers, unfolded, and clamped by the film-pulling mechanism. The fixed rollers are mounted on a fixed frame, which has multiple vertically arranged guide rails. Each guide rail has a slider that slides along it. A slider is positioned at both ends of each movable roller, and the sliders are fixedly connected by connectors. The connectors are fixedly connected to the output end of a second drive mechanism. When the second drive mechanism drives the connector upward, the movable roller moves upward relative to the fixed rollers to unfold the film and / or works in conjunction with the film-pulling mechanism to adjust the tension of the film to be uniform. Alternatively, when the second drive mechanism drives the connector downward, the movable roller moves downward relative to the fixed rollers to release the film.

[0010] Preferably, it also includes multiple buffer mechanisms, each buffer mechanism including a housing and a flexible body sleeved in the housing, each slider is fixedly connected to a housing, and a flexible body is provided at both ends of a moving roller.

[0011] Preferably, each flexible body has a hollow portion, and the upper and lower ends of each flexible body that are used to contact the interior of the shell have toothed structures for generating deformation.

[0012] Preferably, the system further includes a guiding mechanism, which includes a follower, a gear fixedly connected to the follower, and a rack for meshing with the gear. The rack is arranged vertically on the fixed frame, and the connecting member is fixedly connected to the follower.

[0013] Preferably, it further includes a limiting mechanism for preventing the slider from disengaging from the slide rail.

[0014] Preferably, the limiting mechanism includes a limiting block and / or a distance sensor, and the limiting block and / or the distance sensor are disposed directly above at least one connector.

[0015] Preferably, the system further includes a first correction module and a second correction module for correcting the dynamic position of the membrane. Each correction module includes at least two correction sensors. The membrane pulling mechanism includes grippers and a third drive mechanism for adjusting the gripper angle. At least two correction sensors of the first correction module are located inside the grippers to monitor whether the leading edge of the membrane located inside the grippers is perpendicular to the preset straight line. At least two correction sensors of the second correction module are respectively located on both sides of the discharge end of the second storage mechanism or on both sides of a preset position behind the discharge end, and the at least two correction sensors of the second correction module are symmetrically distributed relative to the preset straight line.

[0016] Preferably, the first blocking mechanism and / or the second blocking mechanism includes a pair of clamping rollers, which are used to move from both sides of the membrane toward each other to approach and clamp the membrane; or, the first blocking mechanism and / or the second blocking mechanism includes a squeezing roller and a pressure plate disposed on both sides of the membrane, which are used to squeeze the membrane against the pressure plate to restrict the movement of the membrane.

[0017] Preferably, the discharge end of the second storage mechanism is provided with a holding mechanism for keeping the front end of the film generally facing the film pulling mechanism.

[0018] Preferably, the holding mechanism includes a plurality of horizontally arranged support rods, with a preset interval between each support rod, so that the gripper clamps the membrane located within the preset interval when the membrane is pulled.

[0019] Preferably, the retaining mechanism includes an upper airflow outlet and a lower airflow outlet located on both sides of the membrane.

[0020] The technical solution provided in this application may include the following beneficial effects:

[0021] This invention, by setting up a first storage mechanism and a second storage mechanism, with a first blocking mechanism between them, and a film-pulling mechanism that reciprocates along a preset straight line, configures the combined action of the film-pulling mechanism and the second storage mechanism on the film to adjust the tension of the film released by the second storage mechanism to ensure uniform tension at all points. A second blocking mechanism is also provided between the second storage mechanism and the film-pulling mechanism. Below the film-pulling mechanism, a pressure roller assembly reciprocates along the direction of the preset straight line, and a cutting mechanism is provided for cutting the film after application. Through these settings, this invention ensures that the film-pulling mechanism adjusts the film-exit direction in real time to prevent skewness when pulling the film out, thus ensuring that the tension of the film remains uniform throughout the adjustment process. This effectively controls the deformation of the film before application to prevent excessive deformation and also effectively reduces the labor intensity of operators. Attached Figure Description

[0022] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts wherein:

[0023] Figure 1 This is a schematic diagram illustrating one embodiment of the present invention;

[0024] Figure 2 This is a structural diagram illustrating a second storage mechanism according to an embodiment of the present invention;

[0025] Figure 3 This illustrates the present invention. Figure 2 The front view;

[0026] Figure 4 This illustrates the present invention. Figure 1 A magnified view of a section at point A in the middle;

[0027] Figure 5 This is a schematic diagram illustrating the configuration of the correction sensor in one embodiment of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 100, membrane; 101, lithium battery module; 11, first storage mechanism; 12, second storage mechanism; 13, first blocking mechanism; 14, film pulling mechanism; 15, second blocking mechanism; 16, pressure roller assembly; 17, cutting mechanism; 21, shaft; 22, winding drum; 23, braking component; 24, fixing frame; 31, fixed roller; 32, moving roller; 33, guide rail; 34, slider; 35, connecting component; 36, second drive mechanism; 41, housing; 42, flexible body; 51, hollow part; 52, toothed structure; 61, follower; 62, gear; 63, rack; 71, limiting block; 81, first correction module; 82, second correction module. Detailed Implementation

[0029] Embodiments will now be described with reference to the accompanying drawings. It should be understood that, for the sake of simplicity and clarity, reference numerals may be repeated in the drawings to indicate corresponding or similar elements where deemed appropriate. Furthermore, numerous specific details are set forth in this invention to provide a thorough understanding of the embodiments described herein. However, those skilled in the art will understand that the embodiments described herein can be practiced without these specific details. In other instances, well-known methods, processes, and components have not been described in detail so as not to obscure the embodiments described herein. Moreover, this description should not be construed as limiting the scope of the embodiments described herein.

[0030] According to one embodiment of the present invention, an apparatus for attaching a film to the bottom of a lithium battery module is provided, with reference to... Figures 1 to 5The system includes: a first storage mechanism 11 and a second storage mechanism 12 for storing a membrane 100. The first storage mechanism 11 provides the membrane 100 to the second storage mechanism 12 to transfer the membrane stored in the first storage mechanism 11 to the second storage mechanism 12. The second storage mechanism 12 unfolds the membrane 100 before it is attached to the bottom of the lithium battery module 101. A first blocking mechanism 13 is provided between the first storage mechanism 11 and the second storage mechanism 12 to restrict the first storage mechanism 11 from providing the membrane 100 to the second storage mechanism 12 when the second storage mechanism 12 releases the stored membrane 100. It also includes a membrane-pulling mechanism 14 that reciprocates along a preset straight line. The membrane-pulling mechanism 14 clamps the membrane 100 released by the second storage mechanism 12 and pulls the membrane 100 out of the second storage mechanism 12, thereby releasing the stored membrane 100. The combined action of the membrane-pulling mechanism 14 and the second storage mechanism 12 on the membrane 100 is configured to... The tension of the membrane 100 released by the second storage mechanism 12 is adjusted to make the tension of the released membrane 100 uniform. A second blocking mechanism 15 is provided between the second storage mechanism 12 and the membrane pulling mechanism 14 so that when the second storage mechanism 12 stores the membrane 100 and unfolds the membrane 100, the second blocking mechanism 15 is used to restrict the membrane 100 near the membrane pulling mechanism 14 from retracting to the second storage mechanism 12. The upper side of the membrane pulling mechanism 14 is used to set the lithium battery module 101. The lower side of the membrane pulling mechanism 14 is provided with a pressure roller assembly 16 that reciprocates along a preset straight line. The membrane 100 released by the second storage mechanism 12 is located between the lithium battery module 101 and the pressure roller assembly 16. The pressure roller assembly 16 is used to attach the membrane 100 released by the second storage mechanism 12 to the bottom of the lithium battery module 101. A cutting mechanism 17 is also included. The cutting mechanism 17 is used to cut the membrane 100 so that the membrane attached to the bottom of the lithium battery module 101 is separated from the membrane released by the second storage mechanism 12.

[0031] Before applying the film to the bottom of the lithium battery module 101, the present invention utilizes the film-pulling mechanism 14 and the second storage mechanism 12 to work together on the film 100 to adjust the tension at various points of the film 100, thereby ensuring uniform tension at all points of the film 100. This prevents the film-exit direction from being skewed during the film-pulling process and ensures that the tension at various points of the film remains uniform during the adjustment process. This effectively controls the deformation of the film before application to prevent excessive deformation, reduce the occurrence of film wrinkles or even tears, ensure no air bubbles after application, and effectively reduce the labor intensity of operators.

[0032] It is easy to understand that the preset straight line mentioned above is the direction of film output when the film pulling mechanism 14 pulls the film under ideal conditions, that is, the direction when the film 100 does not deviate at all during the film pulling process.

[0033] refer to Figures 1 to 3The first storage mechanism 11 mentioned above may include a shaft 21 and a winding drum 22 disposed on the shaft 21. The winding drum 22 is used to wind the film 100. It also includes a brake 23 for limiting the rotation of the winding drum 22 to stop the release of the film 100 to the second storage mechanism 12. The brake 23 is configured to apply pressure to both ends of the winding drum 22 and generate friction between the winding drum 22 and the brake 23 when the winding drum 22 rotates. The brake 23 is also configured to adjust the pressure applied to both ends of the winding drum 22. The shaft 21 of the first storage mechanism 11 is fixedly connected to the output end of the first drive mechanism for moving the shaft 21 along its axis. When the first storage mechanism 11 transfers the film 100 to the second storage mechanism 12, the first drive mechanism drives the shaft 21 to move along its axis to adjust the film exit direction of the film 100 wound on the winding drum 22 to be the same as the direction of the preset straight line. The first storage mechanism 11 and the first drive mechanism are detachably connected to the fixing frame 24.

[0034] The braking element 23 here can be a stop spring. The extension and retraction direction of the stop spring is the same as the axial direction of the shaft 21. By placing the stop spring at both ends of the winding drum 22 and keeping the stop spring in a compressed state, the rotation speed of the winding drum 22 can be limited when it rotates. This prevents the first storage mechanism 11 from discharging too much film due to the excessive rotation speed of the winding drum 22, which would prevent the second storage mechanism 12 from receiving the film provided by the first storage mechanism 11. It can also prevent the problem of arbitrary stacking of film 100 caused by the excessive rotation speed of the winding drum 22. In addition, when the second storage mechanism 12 stops pulling the film, that is, when the second storage mechanism 12 no longer drives the winding drum 22 of the first storage mechanism 11 to continue rotating due to pulling the film, the setting of the stop spring can effectively prevent the first storage mechanism 11 from continuing to supply film 100 to the second storage mechanism 12 due to the inertia of the winding drum 22.

[0035] refer to Figure 2 and Figure 3The second storage mechanism 12 mentioned in the above embodiments may include multiple fixed rollers 31 and multiple movable rollers 32. A movable roller 32 is provided between every two fixed rollers 31 along a preset straight line, for winding the film 100 sequentially around the spaced fixed rollers 31 and movable rollers 32, then unwinding the film 100 and having it clamped by the film-stretching mechanism 14. The fixed rollers 31 are mounted on a fixed frame 24, which has multiple vertically arranged guide rails 33. Each guide rail 33 has a slider 34 that slides along the guide rail 33. A slider 34 is provided at both ends of the moving roller 32, and the sliders 34 are fixedly connected to each other by a connector 35. The connector 35 is fixedly connected to the output end of the second drive mechanism 36, so that when the second drive mechanism 36 drives the connector 35 to move upward, the moving roller 32 moves upward relative to the fixed roller 31 to unfold the film 100 and / or works together with the film stretching mechanism 14 to adjust the tension of the film 100 to be uniform at all points; or when the second drive mechanism 36 drives the connector 35 to move downward, the moving roller 32 moves downward relative to the fixed roller 31 to release the film 100.

[0036] It is understandable that when the first storage mechanism 11 transfers the film 100 stored on its winding drum 22 to the second storage mechanism 12, it relies on the second drive mechanism 36 of the second storage mechanism 12 to drive the moving roller 32 upward so that the moving roller 32 moves away from the fixed roller 31. In turn, during the film pulling process, the winding drum 22 is driven to rotate to release the film. As the moving roller 32 moves away from the fixed roller 31, the distance between the moving roller 32 and the fixed roller 31 increases, thereby increasing the length of the film wound on the fixed roller 32 and the moving roller 31 in sequence. As a result, the film 100 is unwound in the second storage mechanism 12 and the film 100 is continuously stored in the second storage mechanism 12.

[0037] During the process of the second storage mechanism 12 releasing the membrane 100, the first blocking mechanism 13 blocks the first storage mechanism 11 from continuing to supply the membrane 100 to the second storage mechanism 12. When the gripper of the membrane pulling mechanism 14 first clamps the membrane 100, the entry depth of the front edge of the membrane 100 at various points in the gripper will inevitably be inconsistent. For example, when the gripper clamps the membrane 100, the left side of the membrane 100 is loose and the right side is tight, or the right side is tight and the left side is loose. If the clamping state of the membrane 100 is not adjusted at this time, the tension of the membrane 100 at various points will remain in an uneven state during the membrane pulling process.

[0038] In the present invention, the second driving mechanism 36 can drive the moving roller 32 to move upward. Through the combined action of the moving roller 32 of the second storage mechanism 12 and the gripper of the film stretching mechanism 14, the film is stretched at both ends. The clamping force of the gripper on the film 100 is adjusted so that the force of the second driving mechanism 36 driving the moving roller 32 on the film can overcome the clamping force of the gripper on the film 100. This causes the left and / or right sides of the film located in the gripper to generate an appropriate displacement relative to the gripper, so as to balance the tension at all points of the film 100.

[0039] In addition, the present invention can also move the film stretching mechanism 14 in a direction perpendicular to a preset straight line to compensate for the left or right offset of the film during the film stretching process, so as to adjust the tension of the film at all points during the film stretching process to keep it in a uniform state in real time, thereby controlling the deformation of the film.

[0040] refer to Figure 2 and Figure 5 To make the monitoring of the membrane position and the adjustment of the membrane pulling direction more accurate, the above embodiment also includes a first correction module 81 and a second correction module 82 for correcting the dynamic position of the membrane. Each correction module includes at least two correction sensors. The at least two correction sensors of the first correction module 81 are located inside the gripper to monitor whether the front edge of the membrane 100 located in the gripper is perpendicular to a preset straight line. The at least two correction sensors of the second correction module 82 are respectively located on both sides of the discharge end of the second storage mechanism 12 or on both sides of a preset position behind the discharge end, and the at least two correction sensors of the second correction module 82 are symmetrically distributed relative to the preset straight line.

[0041] Here, we can use the web correction sensor produced by Jiangsu Lista Machinery Equipment Manufacturing Co., Ltd., and use their EPC520 controller with the DY-3 web correction sensor. The web correction sensor is existing technology and will not be described in detail here.

[0042] refer to Figure 3 and Figure 5 In the above embodiments, the film stretching mechanism 14 also includes grippers and a third drive mechanism 83 for adjusting the gripper clamping angle. Adjusting the gripper clamping angle is mainly used to make the plane where the film held by the gripper is coplanar with the plane where the film is unfolded when adjusting the tension at various points of the film 100.

[0043] refer to Figure 1 and Figure 4In one embodiment, multiple buffer mechanisms may be included, each buffer mechanism including a housing 41 and a flexible body 42 sleeved within the housing 41. Each slider 34 is fixedly connected to a housing 41, and a flexible body 42 is provided at both ends of a moving roller 32. In abnormal situations, such as when the pulling force of the film pulling mechanism 14 is too sudden, or when the second driving mechanism 36 drives the moving roller 32 to move upward too suddenly and the second blocking mechanism 15 restricts the film near the film pulling mechanism 14 from returning to the second storage mechanism 12 and the first blocking mechanism 13 also restricts the first storage mechanism 11 from providing film 100 to the second storage mechanism 12, or even when the pulling force suddenly increases during the stabilizing film pulling process, rapid film pulling in these situations can easily cause large deformation of the film. The purpose of the buffer mechanism is to mitigate the impact of abnormal film pulling on the film deformation. When the film pulling mechanism 14 rapidly pulls the film, the moving roller 32 controlled by the second drive mechanism 36 cannot move downward instantly. At this time, the lower end of the flexible body 42 in the buffer mechanism deforms to buffer the instantaneous force on the film during rapid film pulling. Alternatively, when the second drive mechanism 36 drives the moving roller 32 to move upward rapidly, the upper end of the flexible body 42 in the buffer mechanism deforms to buffer the instantaneous force on the film during rapid film pulling.

[0044] In the above embodiments, each flexible body 42 has a hollow portion 51, and each flexible body 42 has a toothed structure 52 at both its upper and lower ends for contacting the interior of the housing 41 to generate deformation.

[0045] The flexible body 42 mentioned above can be a block of urethane.

[0046] refer to Figure 1 and Figure 2 In another embodiment, a guiding mechanism is also included. The guiding mechanism includes a follower 61, a gear 62 fixedly connected to the follower 61, and a rack 63 for meshing with the gear 62. The rack 63 is vertically disposed on the fixed frame 24, and the connecting member 35 is fixedly connected to the follower 61. The guiding mechanism can effectively ensure that the two ends of the moving roller 32 maintain synchronous movement, thereby improving the stability of the entire storage film and the film release.

[0047] refer to Figure 1 In another embodiment, a limiting mechanism is also included to prevent the slider 34 from disengaging from the guide rail 33. The limiting mechanism includes a limiting block 71 and / or a distance sensor, with the limiting block 71 and / or distance sensor located directly above at least one connector 35. The limiting block 71 is fixed in position and is designed for hard contact to prevent the slider 34 from disengaging from the guide rail 33 in case of accidental events, such as when the distance sensor fails.

[0048] The first blocking mechanism 13 and / or the second blocking mechanism 15 mentioned above can both include a pair of clamping rollers, which are used to move from both sides of the membrane 100 toward each other to approach and clamp the membrane 100; or, the first blocking mechanism 13 and / or the second blocking mechanism 15 include a squeezing roller and a pressure plate disposed on both sides of the membrane 100, which are used to squeeze the membrane 100 against the pressure plate to restrict the movement of the membrane 100.

[0049] refer to Figure 3 After the film is applied to the bottom of the lithium battery module 101, the cutting mechanism 17 cuts the film 100 to separate the film applied to the bottom of the lithium battery module 101 from the film released by the second storage mechanism 12. After separation, the free end of the film released by the second storage mechanism 12 is prone to drooping and is not easily clamped by the grippers of the film pulling mechanism 14. In some embodiments, a holding mechanism is also provided at the discharge end of the second storage mechanism 12 to keep the front end of the film 100 generally facing the film pulling mechanism 14. Specifically, the holding mechanism includes a plurality of horizontally arranged support rods, each support rod having a preset interval, so that the grippers clamp the film located within the preset interval when pulling the film; or, the holding mechanism includes an upper airflow outlet and a lower airflow outlet located on both sides of the film, and before the film pulling mechanism 14 pulls the film, the airflow located on the upper and lower sides of the film is used to keep the film in a generally horizontal state.

[0050] It should be understood that the possible terms "first" or "second," etc., in the claims, specification, and drawings disclosed in this invention are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "including" used in the specification and claims of this invention indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0051] It should also be understood that the terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of the disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0052] While the embodiments of the present invention are described above, these are merely examples for the purpose of facilitating understanding of the invention and are not intended to limit the scope or application scenarios of the invention. Any person skilled in the art can make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the patent protection scope of the present invention shall still be determined by the scope defined in the appended claims.

Claims

1. A device for attaching a film to the bottom of a lithium battery module, characterized in that, include: A first storage mechanism (11) and a second storage mechanism (12) for storing a membrane (100), the first storage mechanism (11) for providing the membrane (100) to the second storage mechanism (12) to transfer the membrane stored in the first storage mechanism (11) to the second storage mechanism (12), the second storage mechanism (12) for unfolding the membrane (100) before it is attached to the bottom of the lithium battery module (101); a first blocking mechanism (13) is provided between the first storage mechanism (11) and the second storage mechanism (12) to prevent the second storage mechanism (12) from releasing the storage membrane. When the membrane (100) is in contact with the second storage mechanism (12), the first blocking mechanism (13) is used to restrict the first storage mechanism (11) from providing the membrane (100) to the second storage mechanism (12); it also includes a membrane pulling mechanism (14) that reciprocates along a preset straight line, the membrane pulling mechanism (14) being used to clamp the membrane (100) released by the second storage mechanism (12) and pull the membrane (100) out of the second storage mechanism (12), so that the second storage mechanism (12) releases the stored membrane (100), the combined action of the membrane pulling mechanism (14) and the second storage mechanism (12) on the membrane (100) is configured to be able to The tension of the membrane (100) released by the second storage mechanism (12) is adjusted to make the tension of the released membrane (100) uniform; a second blocking mechanism (15) is provided between the second storage mechanism (12) and the membrane pulling mechanism (14) so ​​that when the second storage mechanism (12) stores the membrane (100) and unfolds the membrane (100), the second blocking mechanism (15) is used to restrict the membrane (100) near the membrane pulling mechanism (14) from retracting to the second storage mechanism (12); a lithium battery module (101) is set on the upper side of the membrane pulling mechanism (14). Below the lithium battery module (101) is a pressure roller assembly (16) that reciprocates along the direction of the preset straight line. The membrane (100) released by the second storage mechanism (12) is located between the lithium battery module (101) and the pressure roller assembly (16). The pressure roller assembly (16) is used to attach the membrane (100) released by the second storage mechanism (12) to the bottom of the lithium battery module (101). The module also includes a cutting mechanism (17) for cutting the membrane (100) so that the membrane attached to the bottom of the lithium battery module (101) is separated from the membrane (100) released by the second storage mechanism (12). The first storage mechanism (11) is detachably connected to the fixing frame (24). The second storage mechanism (12) includes multiple fixed rollers (31) and multiple movable rollers (32). A movable roller (32) is provided between every two fixed rollers (31) in the direction along the preset straight line, so that the film (100) is wound around the spaced fixed rollers (31) and movable rollers (32) in sequence, and then the film (100) is unfolded and the film (100) is clamped by the film pulling mechanism (14). The fixed rollers (31) are provided on the fixed frame (24). The fixed frame (24) has multiple guide rails (33) arranged in the vertical direction. Each guide rail (33) has a slider (34) that slides along the guide rail (33). A slider (34) is provided at both ends of any movable roller (32). The sliders (34) are fixedly connected to each other by connectors (35). It also includes multiple buffer mechanisms, each of which includes a housing (41) and a flexible body (42) sleeved inside the housing (41). Each slider (34) is fixedly connected to a housing (41), and a flexible body (42) is provided at both ends of a moving roller (32). Each flexible body (42) has a hollow portion (51), and each flexible body (42) has a toothed structure (52) at both the upper and lower ends for contacting the interior of the housing (41) for generating deformation. It also includes a first correction module (81) and a second correction module (82) for correcting the dynamic position of the membrane. Each correction module includes at least two correction sensors. The membrane pulling mechanism (14) includes a gripper and a third drive mechanism (83) for adjusting the gripper's clamping angle. At least two correction sensors of the first correction module (81) are located inside the gripper to monitor whether the front edge of the membrane (100) located inside the gripper is perpendicular to the preset straight line. At least two correction sensors of the second correction module (82) are respectively located on both sides of the discharge end of the second storage mechanism (12) or on both sides of a preset position behind the discharge end. The at least two correction sensors of the second correction module (82) are symmetrically distributed relative to the preset straight line.

2. The apparatus according to claim 1, characterized in that, The first storage mechanism (11) includes a shaft (21) and a winding drum (22) disposed on the shaft (21), the winding drum (22) being used to wind the membrane (100), and further includes a brake (23) for restricting the rotation of the winding drum (22) to stop releasing the membrane (100) to the second storage mechanism (12), the brake (23) being configured to apply pressure to both ends of the winding drum (22) and to generate friction between the winding drum (22) and the brake (23) when the winding drum (22) rotates, the brake (23) being further configured to adjust The pressure applied to both ends of the winding drum (22) is fixedly connected to the output end of the first drive mechanism of the first storage mechanism (11) so as to move the shaft (21) along its axis direction. When the first storage mechanism (11) transfers the film (100) to the second storage mechanism (12), the first drive mechanism drives the shaft (21) to move along its axis direction to adjust the exit direction of the film (100) wound on the winding drum (22) to be the same as the direction of the preset straight line. The first drive mechanism is detachably connected to the fixing frame (24).

3. The apparatus according to claim 2, characterized in that, The connector (35) is fixedly connected to the output end of the second drive mechanism (36) so that when the second drive mechanism (36) drives the connector (35) to move upward, the moving roller (32) moves upward relative to the fixed roller (31) to unfold the film (100) and / or works together with the film pulling mechanism (14) on the film (100) to adjust the tension of the film (100) to be uniform at all points; or when the second drive mechanism (36) drives the connector (35) to move downward, the moving roller (32) moves downward relative to the fixed roller (31) to release the film (100).

4. The apparatus according to claim 3, characterized in that, It also includes a guiding mechanism, which includes a follower (61), a gear (62) fixedly connected to the follower (61), and a rack (63) for meshing with the gear (62). The rack (63) is arranged vertically on the fixed frame (24), and the connecting member (35) is fixedly connected to the follower (61).

5. The apparatus according to claim 3, characterized in that, It also includes a limiting mechanism for restricting the slider (34) from disengaging from the guide rail (33), the limiting mechanism including a limiting block (71) and / or a distance sensor, the limiting block (71) and / or the distance sensor being located directly above at least one connector (35).

6. The apparatus according to claim 1, characterized in that, The first blocking mechanism (13) and / or the second blocking mechanism (15) include a pair of clamping rollers for moving toward each other from both sides of the membrane (100) to approach and clamp the membrane (100); or, the first blocking mechanism (13) and / or the second blocking mechanism (15) include a squeezing roller and a pressure plate disposed on both sides of the membrane (100), the squeezing roller for squeezing the membrane (100) against the pressure plate to restrict the movement of the membrane (100).

7. The apparatus according to claim 1, characterized in that, The discharge end of the second storage mechanism (12) is provided with a holding mechanism for making the front end of the film (100) generally face the film pulling mechanism (14).

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