Film tensioning component, film pulling mechanism and film wrapping apparatus

Abstract

The application discloses a film tension component, a film pulling mechanism and a film coating device, and relates to the technical field of battery film coating. The film tension component comprises a first base, a film pulling end component, a joint driving component and a tension component. The film pulling end component is used for being connected with the end of a film pulling rod to drive the film pulling rod to perform a film pulling action. The film pulling end component has an up-and-down floating stroke on the first base. The joint driving component has a floating joint which can be extended and retracted. When the floating joint is extended, the floating joint presses the film pulling end component to move downward along the floating stroke. When the floating joint is retracted, the floating joint is separated from the film pulling end component, so that the film pulling end component has an up-floating space in the floating stroke. The tension component comprises at least one elastic member, which is used for applying an elastic force to the film pulling end component during the up-floating process of the film pulling end component, so as to provide a film tension for the film pulling rod through the film pulling end component. The application can provide a tension for the film pulling rod during the battery film coating process.

Description

Technical Field

[0001] This invention relates to the field of battery packing technology, and particularly to a packing tensioning component, a packing mechanism, and a packing device. Background Technology

[0002] In the later stages of lithium-ion battery manufacturing, the outer surface of the battery needs to be coated with a blue film. The main function of the blue film is to protect the battery from external scratches or electrolyte corrosion. In developing this invention, the inventors discovered at least the following problems in the existing technology: Currently, when coating the battery with the blue film, a film-pulling mechanism pulls the film from a film-laying component, a pushing mechanism pushes the battery to the position of the blue film pulled out by the film-pulling mechanism, and then continues to push the battery towards the coating mechanism, finally coating the battery surface with the blue film.

[0003] However, when the feeding mechanism pushes the battery to the coating mechanism, the blue film on the upper surface of the battery is compensated by the film-laying component, while the lower surface is compensated by the lifting of the film-pulling rod. The required feed amount of blue film to the lower surface is not uniform, and it is difficult to keep the lifting stroke of the film-pulling rod consistent with this. If the film-pulling rod lifts too early, the blue film on the lower surface of the battery will lose tension, making it prone to air bubbles during coating, affecting battery product quality and yield. If the film-pulling rod lifts too late, the blue film will detach from the rod prematurely, easily causing wrinkles and defects, further impacting product yield. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, embodiments of the present invention provide a coating tensioning component that allows the pulling rod to provide tension to the blue film during the battery coating process, preventing the blue film from prematurely detaching from the pulling rod or causing bubbles and wrinkles in the blue film due to insufficient tension, thereby improving the coating quality.

[0005] This invention also provides a film-pulling mechanism that utilizes the aforementioned film-coating tension component.

[0006] This invention also provides a coating device that uses the above-described film-stretching mechanism.

[0007] According to an embodiment of a first aspect of the present invention, a film-coating tension component is provided, comprising: a first base; a film-pulling end assembly for connection to the end of a film-pulling rod to drive the film-pulling rod to perform a film-pulling action, the film-pulling end assembly having a floating stroke that floats up and down on the first base; a joint driving assembly having an extendable and retractable floating joint located above the film-pulling end assembly, wherein when the floating joint extends, the floating joint presses against the film-pulling end assembly and moves downward along the floating stroke, and when the floating joint retracts, the floating joint disengages from the film-pulling end assembly, so that the film-pulling end assembly has an upward floating space during the floating stroke; and a tension component, the tension component comprising at least one elastic element, one end of the elastic element being connected to the first base, and the other end of the elastic element being connected to the film-pulling end assembly to apply an elastic force to the film-pulling end assembly during the upward floating process, thereby driving the film-pulling rod through the film-pulling end assembly to provide film-coating tension.

[0008] According to an embodiment of the first aspect of the present invention, the elastic element is disposed below the membrane end assembly, the lower end of the elastic element is connected to the first base, and the upper end of the elastic element is connected to the membrane end assembly. Further, the elastic element is a tension spring.

[0009] According to an embodiment of a first aspect of the present invention, the joint driving assembly includes a first driving source and a first lifting guide rail. The first lifting guide rail is disposed on the first base. The film-stretching end assembly is directly or indirectly connected to the first lifting guide rail so that the film-stretching end assembly can move up and down along the first lifting guide rail. The first driving source is mounted on the first base. The floating joint is connected to the driving end of the first driving source to realize up and down movement. A lower limit block is fixed at the lower part of the first base for controlling the lower limit of the film-stretching end assembly. The film-stretching end assembly is provided with an upper limit block. When the floating joint is in the extended state, it presses against the upper limit block. When the floating joint is in the retracted state, the upper limit block controls the maximum upward floating height of the film-stretching end assembly. Further, the first driving source is a tension cylinder. The cylinder seat of the tension cylinder is mounted on the first base, and the floating joint is connected to the piston rod of the tension cylinder.

[0010] According to an embodiment of the first aspect of the present invention, a transverse moving component is further provided between the first base and the film-stretching end assembly, the film-stretching end assembly is mounted on the transverse moving component, the transverse moving component is connected to the first lifting guide rail, and the vertical movement stroke of the transverse moving component is the floating stroke.

[0011] According to an embodiment of the first aspect of the present invention, the lateral movement assembly includes a second base, a second drive source, and a first lateral movement guide rail. The second base is connected to the first lifting guide rail so that the second base can move up and down along the first lifting guide rail. The up and down movement stroke of the second base is the floating stroke. The first lateral movement guide rail is disposed on the second base. The film-pulling end assembly is connected to the first lateral movement guide rail so that the film-pulling end assembly can move laterally along the first lateral movement guide rail. The second drive source is mounted on the second base, and the drive end of the second drive source is connected to the film-pulling end assembly to drive the film-pulling end assembly to move laterally.

[0012] According to an embodiment of a second aspect of the present invention, a film-pulling mechanism is provided, comprising a film-pulling rod, a second frame, the second frame including two upright plates spaced apart along the width direction of the second frame; and a film-pulling rod extending from one of the upright plates to the other upright plate, wherein at least one end of the film-pulling rod is fitted with a film-coating tension member as described in the first aspect of the present invention, the film-pulling end assembly including a third base, the third base being directly or indirectly connected to a first lifting guide rail, and the end of the film-pulling rod being connected to the third base.

[0013] According to an embodiment of a second aspect of the present invention, the second frame is provided with a lifting drive assembly, the lifting drive assembly including two sets of second lifting guide rails respectively disposed on the two vertical plates and a third drive source for driving the coating tension component to move up and down along the second lifting guide rails, the first base being slidably connected to the second lifting guide rails, and the third drive source being connected to the first base through a transmission member.

[0014] According to an embodiment of a third aspect of the present invention, a coating apparatus is provided, comprising a film-pulling mechanism as described in the second aspect of the present invention, the film-pulling mechanism having a battery input channel; a pushing mechanism for pushing a battery into the battery input channel; and a coating mechanism, the coating mechanism comprising a third frame, the third frame having an upper pressure roller and a lower pressure roller on a side near the second frame, a battery output channel forming between the upper pressure roller and the lower pressure roller, the battery output channel being connected to the battery input channel to receive the battery transmitted by the battery input channel and perform coating, and an operating space for the film-pulling rod to pull the film between the battery output channel and the battery input channel.

[0015] Based on the above technical solution, the embodiments of the present invention have at least the following beneficial effects: In the coating tension component, by setting a floating stroke for the film-pulling end assembly to float up and down at the first base, when the floating joint extends, the floating joint presses the film-pulling end assembly downward along the floating stroke, and the extended floating joint pushes the film-pulling end assembly to the coating position, fixing it without offset, preventing misalignment when pulling the blue film of the battery; when the floating joint retracts, the floating joint disengages from the film-pulling end assembly, the film-pulling end assembly does not move, the film-pulling end assembly can float upward during the floating stroke, the film-pulling end assembly drives the film-pulling rod to pull the blue film to the coating position, the pushing mechanism pushes the battery into the coating mechanism for coating, the blue film is dragged upward by the film-pulling rod to float, avoiding the blue film from disengaging from the film-pulling rod on the film-pulling end assembly in advance, and the elastic force applied by the elastic element can hold the film-pulling end assembly, the end of the pulling rod is connected to the film-pulling end assembly, during the film-pulling process, the elastic force applied by the elastic element is transmitted to the pulling rod through the film-pulling end assembly, and sufficient coating tension can be provided during the coating process of the blue film. This application can provide tension to the lower surface of the blue film during battery encapsulation, preventing air bubbles and wrinkles from forming during battery encapsulation, thus improving encapsulation quality and yield; it also prevents the blue film from prematurely detaching from the film-pulling end assembly, thus preventing wrinkles from forming during battery encapsulation and improving encapsulation yield. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is a schematic diagram of the film-stretching mechanism in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A magnified view of a section of circle A;

[0019] Figure 3 This is a schematic diagram of the structure of the film tension component in an embodiment of the present invention;

[0020] Figure 4 This is a side view of the film-pulling mechanism in an embodiment of the present invention;

[0021] Figure 5 This is a front view of the film-pulling mechanism in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the coating device in an embodiment of the present invention performing the first action;

[0023] Figure 7 yes Figure 6 A magnified view of a section of circle B in the middle;

[0024] Figure 8 This is a schematic diagram of the coating device performing the second action in an embodiment of the present invention;

[0025] Figure 9 yes Figure 8 A magnified view of a section of the C-ring;

[0026] Figure 10 This is a schematic diagram of the coating device performing the third action in an embodiment of the present invention;

[0027] Figure 11 yes Figure 10 A magnified view of a section of the D-ring;

[0028] Figure 12 This is a schematic diagram of the coating device performing the fourth action in an embodiment of the present invention;

[0029] Figure 13 yes Figure 12 A magnified view of a section of the E-ring;

[0030] Figure 14 This is a schematic diagram of the structure before the battery pack is applied in the prior art;

[0031] Figure 15 This is a schematic diagram of the structure of a battery pack in the prior art;

[0032] Figure 16 This is a schematic diagram of the structure of the battery pack before the film is applied, according to an embodiment of the present invention.

[0033] Figure 17 This is a schematic diagram of the structure of the battery pack in an embodiment of the present invention.

[0034] Figure label:

[0035] The pusher mechanism 100, the first frame 111, the pusher block 121, the pusher screw 122, the pusher drive source 123, and the pusher sliding track component 124;

[0036] The film stretching mechanism 200, second frame 211, lifting drive assembly 220, second lifting guide rail 221, third drive source 222, transmission component 223, film tension component 230, first base 2310, lower limit block 2311, transverse component 2320, second base 2321, first transverse guide rail 2322, second drive source 2323, upper limit block 2324, film stretching end assembly 2330, third base 2331, film stretching rod 241, joint drive assembly 2340, tension cylinder 2341, first lifting guide rail 2342, floating joint 2343, tension assembly 2350, elastic component 2351, film stretching rod 241, blue film 250, and front row pressure roller assembly 261.

[0037] The coating mechanism is 300, the third frame is 310, the upper pressure roller is 321, and the lower pressure roller is 322;

[0038] Battery 400. Detailed Implementation

[0039] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0041] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0042] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0043] In existing technologies, such as Figure 14 As shown, the blue film 250 is stretched by the film-pulling rod 241. A battery output channel is located between the upper pressure roller 321 and the lower pressure roller 322. The battery 400 is pushed in from the battery input channel, coated by the blue film 250, and then pushed into the battery output channel. Combined with... Figure 15 The battery 400 is pushed into the battery output channel. During the battery wrapping process, the blue film on the upper surface of the battery is compensated by the film-laying component, while the lower surface of the battery is compensated by the upward movement of the film-pulling rod 241.

[0044] When the battery 400 first contacts the blue film 250, the straight-line length from the adhesive bottom corner to the film pulling rod is set as X1, and the length of the adhesive section of the film pulling rod is set as X3. When the battery 400 is pushed into the battery output channel, the length from the adhesive bottom corner to the film pulling rod includes the first straight-line segment a, the arc segment b, and the second straight-line segment c. The length from the adhesive bottom corner to the film pulling rod is set as X2, where X2 = a + b + c. However, even if the speed and time of pushing the battery and the upward movement of the film pulling rod are the same, since the amount of blue film feed required for the lower surface of the battery is not uniform, if the lifting stroke of the pulling rod needs to be kept consistent with it, the driving speed of the motor driving the lifting of the pulling rod needs to be constantly changed. The change in the amount of blue film feed required for the lower surface of the battery is not linear, and it is still difficult for the pulling rod to keep it consistent with it. That is, it is difficult to make X2 equal to X1.

[0045] Thus, if the film-pulling rod is raised in advance during the coating process, then X1 > X2. Figure 15 To understand this, when the pulling rod 241 lifts the blue film on the lower surface of the battery, if the pulling rod rises too quickly, the blue film between the pulling rod and the lower pressure roller will become too long. This means that segment X2 will lose tension, resulting in wrinkles and bubbles in the blue film during battery coating. If the pulling rod rises with a delay, then X1 < X2. Figure 15 To understand this, when the pulling rod 241 drives the blue film on the lower surface of the battery to rise, the blue film between the pulling rod and the lower pressure roller will be stretched and tightened due to the delay in the rise of the pulling rod. This will cause the pulling rod to rotate, which is compensated by X3. That is to say, X2 needs to be stretched, and its length needs to be increased to keep it equal to X1. The increased length is compensated by X3. When the length increase is less than X3, the film can be successfully coated, and the pulling rod can still adhere to the blue film. When the length increase is greater than X3, the blue film will detach from the adhesion of the pulling rod, and at this time the pulling rod will lose tension on the blue film.

[0046] Therefore, existing technologies cannot overcome the problems of wrinkles and bubbles in the blue film.

[0047] The following reference Figures 6 to 13 This describes a coating apparatus according to an embodiment of the present invention, which is used for coating a battery.

[0048] The following reference Figure 1 This describes a film-stretching mechanism 200 according to an embodiment of the present invention, which can be applied to a coating equipment.

[0049] The following reference Figures 1 to 5 The following describes a film tension member 230 according to an embodiment of the present invention, which can be applied in a film stretching mechanism 200.

[0050] like Figures 1 to 5As shown, the film tensioning component 230 according to an embodiment of the present invention includes a first base 2310, a film stretching end assembly 2330, a connector driving assembly 2340, and a tensioning component 2350.

[0051] Among them, such as Figure 2 and Figure 3 As shown, the membrane-pulling end assembly 2330 is connected to the end of the membrane-pulling rod 241 and is used to drive the membrane-pulling rod 241 to perform membrane-pulling action. The membrane-pulling end assembly 2330 has a floating stroke on the first base 2310, which means that the membrane-pulling end assembly 2330 can move up and down on the first base 2310.

[0052] like Figure 2 and Figure 3 As shown, the connector drive assembly 2340 has an extendable and retractable floating connector 2343, which is located above the film-stretching end assembly 2330. When the floating connector 2343 extends, it presses against the film-stretching end assembly 2330 and moves downward along the floating stroke. When the floating connector 2343 retracts, it disengages from the film-stretching end assembly 2330, so that the film-stretching end assembly 2330 has upward floating space during the floating stroke.

[0053] The tension assembly 2350 includes at least one elastic element 2351, one end of which is connected to the first base 2310 and the other end of which is connected to the film-pulling end assembly 2330, so as to apply an elastic force to the film-pulling end assembly 2330 during the upward floating process of the film-pulling end assembly 2330, thereby driving the pulling rod 241 to provide film-coating tension through the film-pulling end assembly 2330.

[0054] The film-coating tension member 230 of this embodiment of the invention, by setting a floating stroke for the film-pulling end assembly 2330 to float up and down in the first base 2310, when the floating joint 2343 extends, the floating joint 2343 presses the film-pulling end assembly 2330 downward along the floating stroke, and the extended floating joint 2343 pushes the film-pulling end assembly to the film-coating position, fixing it without deviation and preventing misalignment when pulling the battery blue film; when the floating joint 2343 retracts, the floating joint 2343 disengages from the film-pulling end assembly 2330, and can be combined with Figure 11To understand this, the film-pulling end assembly 2330 is not in operation at this time. The film-pulling end assembly 2330 can float upward during the floating stroke. The film-pulling end assembly 2330 is pulled to the blue film to the wrapping position. The battery is pushed to the blue film and wrapped. The blue film drags the film-pulling end assembly 2330 upward to prevent the blue film from detaching from the film-pulling end assembly 2330 in advance. The elastic force applied by the elastic element 2351 can hold the film-pulling end assembly 2330. The end of the pulling rod 241 is connected to the film-pulling end assembly 2330. During the film-pulling process, the elastic force applied by the elastic element 2351 is transmitted to the pulling rod 241 through the film-pulling end assembly 2330, providing sufficient wrapping tension during the wrapping of the blue film. The coating tension component 230 can provide tension to the lower surface of the blue film during battery coating, preventing air bubbles and wrinkles from forming during battery coating, thus improving coating quality and yield; it also prevents the blue film from prematurely detaching from the film pulling end assembly, thus preventing wrinkles from forming during battery coating and improving coating yield.

[0055] The specific application and operation of the coating tension component 230 in the coating equipment are described below.

[0056] In this embodiment, the elastic element 2351 is disposed below the film-pulling end assembly 2330. The lower end of the elastic element 2351 is connected to the first base 2310, and the upper end of the elastic element 2351 is connected to the film-pulling end assembly 2330. Specifically, the elastic element 2351 is a tension spring, and two elastic elements 2351 are provided in this embodiment. Those skilled in the art can adjust the number of elastic elements according to the tension provided by the pulling rod to the film and the elastic force of the elastic elements. In other embodiments, the elastic element can also be a compression spring, but it needs to be disposed above the film-pulling end assembly.

[0057] Reference Figure 2 and Figure 3 The connector drive assembly 2340 includes a first drive source and a first lifting guide rail 2342. The first lifting guide rail is disposed on the first base 2310. The film-stretching end assembly 2330 is directly or indirectly connected to the first lifting guide rail 2342 so that the film-stretching end assembly 2330 can move up and down along the first lifting guide rail 2342. The length of the first lifting guide rail 2342 is designed according to the floating stroke. The first drive source is mounted on the first base 2310, and the floating connector 2343 is connected to the drive end of the first drive source to realize up and down movement.

[0058] Specifically, the first driving source is a tension cylinder 2341, the cylinder seat of which is mounted on the first base 2310, and the floating joint 2343 is connected to the piston rod of the tension cylinder 2341. In some embodiments, the first driving source may also be an electric push rod or other conventional linear drive components. For example, the floating joint can also be driven to move by an electric push rod; moving downwards is equivalent to extending, and moving upwards is equivalent to retracting.

[0059] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 According to an embodiment of the present invention, the film-pulling mechanism includes a second frame 211 and a film-pulling rod 241.

[0060] like Figure 1 As shown, the second frame 211 includes two uprights, which are spaced apart along the width of the second frame 211. A film tensioning rod 241 extends from one of the uprights to the other, and at least one end of the film tensioning rod 241 is fitted with the aforementioned film tensioning member 230.

[0061] Among them, in the film tensioning component 230, the film pulling end assembly 2330 includes a third base 2331, which is directly or indirectly connected to the first lifting guide rail 2342, and the end of the film pulling rod 241 is connected to the third base 2331.

[0062] In application, a film tensioning component can be installed at only one end of the film-pulling rod 241. In this case, the third base 2331 is directly or indirectly connected to the first lifting guide rail 2342, and a connecting plate can be installed at the other end of the film-pulling rod 241. The connecting plate is then slidably connected to the upright plate of the second frame. The sliding connection can be achieved using a guide rail slider structure. It can be understood that when one end of the film-pulling rod 241 moves downward when the floating joint 2343 extends, the other end will also move downward accordingly. Similarly, when the elastic element 2351 applies a downward elastic force to one end of the film-pulling rod 241, the film-pulling rod has a floating buffer, and the other end of the film-pulling rod 241 also receives a corresponding floating buffer.

[0063] In this embodiment, in order to make the force on both ends of the film-pulling rod 241 more even, film-coating tension components 230 are installed at both ends of the film-pulling rod 241.

[0064] The first, second, and third bases are all plate-like structures. In this embodiment, a film-laying component is connected to the top of the second frame 211, which provides the blue film 250 starting from the top of the first frame 211. The film-laying component can be installed on the second frame 211 or on a separate frame.

[0065] It is understandable that the film-pulling end assembly 2330 needs to be moved upwards to the film-laying component for film pulling. The specific film pulling action will be described below. The overall upward movement of the film-pulling end assembly 2330 for film pulling is operated by moving the film-coating tension component 230 up and down. Correspondingly, the upright plate of the second frame 211 is provided with a lifting drive assembly 220. The lifting drive assembly includes two sets of second lifting guide rails 221 respectively set on the two upright plates and a third drive source 222 that drives the film-coating tension component to move up and down along the lifting guide rails 221. The first base 2310 is slidably connected to the second lifting guide rails 221, and the third drive source 222 is connected to the first base 2310 through a transmission component 223.

[0066] The aforementioned third drive source 222 employs a motor or other conventional shaft drive assembly, and the transmission component 223 can be a belt drive mechanism. For example, in Figure 1 , Figure 2 In the illustrated embodiment, the third drive source 222 is a motor, and the transmission component 223 includes a driving wheel and a driven wheel rotatably mounted on the outer side of the upright plate of the second frame 211. The driving wheel and the driven wheel are connected by a transmission belt, and the driving wheel is driven by the motor. If two film tensioning components 230 are used, two lifting drive assemblies 220 are used to make the transmission more stable. In this case, another lifting drive assembly 220 is mounted on the outer side of another upright plate of the second frame 211, and the two lifting drive assemblies 220 share a motor. The motor can drive the two driving wheels to rotate using a transmission shaft. By rotating the motor in both directions, the film tensioning component 230 can achieve reciprocating motion along the height direction.

[0067] Reference Figures 6 to 13 The coating apparatus according to an embodiment of the present invention includes a pushing mechanism 100, a film pulling mechanism 200, and a coating mechanism 300.

[0068] The membrane stretching mechanism 200 has a battery input channel;

[0069] The pusher mechanism 100 is used to push the battery into the battery input channel. For example... Figure 6As shown, the pushing mechanism 100 includes a first frame 111 and a pushing component mounted on the first frame 111. The pushing component includes a pushing drive source 123 mounted on the first frame 111 and a pushing block 121 driven by the pushing drive source 123. The pushing block 121 is used to push the battery to move into the battery input channel. The pushing drive source 123 is a motor, and the motor drive shaft is connected to a pushing lead screw 122. The pushing lead screw 122 is connected to the pushing block 121 to realize the linear drive of the pushing block 121. Correspondingly, a pushing sliding track 124 is provided between the pushing block 121 and the first frame 111. The pushing lead screw 122 adopts a lead screw and nut mechanism, which is prior art and will not be described in detail. In some embodiments, the pushing drive source can also adopt a cylinder push rod, an electric push rod, or other conventional linear drive components. For example, the pushing block can also be driven to move by a cylinder push rod. The first frame 111 is provided with a support roller assembly for the battery to slide, combined with Figure 1 To understand this, the front pressure roller assembly 261 in the film stretching mechanism 200 is located above the support roller assembly, and the battery is pressed tightly against the support roller assembly. A battery input channel is formed between the front pressure roller assembly 261 and the support roller assembly.

[0070] Reference Figure 6 The coating mechanism 300 includes a third frame 311. The third frame 311 has an upper pressure roller 321 and a lower pressure roller 322 on the side near the second frame 211. A battery output channel is formed between the upper pressure roller 321 and the lower pressure roller 322. The battery output channel is connected to the battery input channel to receive the battery 400 transmitted by the battery input channel and to coat it. There is an operating space between the battery output channel and the battery input channel for the film pulling rod 241 to pull the film.

[0071] Reference Figure 6 and Figure 7 At this time, the coating equipment is performing the first action. The floating joint 2343 extends and presses the film-pulling end assembly 2330 down along the floating stroke. The floating joint 2343 extends and pushes the film-pulling end assembly to the coating position.

[0072] Reference Figure 8 and Figure 9 At this time, when the coating equipment is performing the second action, the floating joint 2343 retracts and disengages from the film-pulling end assembly 2330, and the film-pulling end assembly 2330 can float during the floating stroke.

[0073] Reference Figure 10 and Figure 11 At this time, the coating equipment is performing the third action: the battery 400 is pushed in from the battery input channel, coated by the blue film 250, and then pushed into the battery output channel.

[0074] At this point, as mentioned above, if the film-pulling rod is raised prematurely, then X1 > X2, which will cause the blue film between the film-pulling rod and the lower pressure roller to be too long, resulting in the loss of tension in section X2. When the battery is coated, wrinkles and bubbles will appear in the blue film. If the film-pulling rod is raised late, then X1 < X2, which will cause the blue film between the film-pulling rod and the lower pressure roller to be stretched and tightened, and will drive the film-pulling rod to rotate. This is compensated by X3. X2 needs to be stretched, and its length needs to be increased to keep it equal to X1. The increased length is compensated by X3. When the lengthening section is greater than X3, the blue film will detach from the adhesion of the film-pulling rod. At this time, the film-pulling rod will lose tension on the blue film.

[0075] In this embodiment, by providing a film-pulling end assembly 2330 at the end of the film-pulling rod, the film-pulling rod 241 has space to float upwards, and the elastic element 2351 provides elastic force during the upward floating process of the film-pulling rod. See details... Figure 10 The battery 400 is pushed into the battery output channel for film wrapping. The blue film required to wrap the lower surface of the battery needs to be compensated by the upward movement of the film pulling rod 241. At this time, the lifting drive assembly 220 drives the film wrapping tension component 230 to move upward. This can be compared with... Figure 8 and Figure 9 The height position of the membrane stretching end assembly 2330 on the second lifting guide rail 221 indicates that the driving speed of the third drive source 222 can be kept at a constant rotation speed, using the low value of the feed speed of the blue film during the battery pack film process. At this time, the stretching rod can be understood as a delayed lifting motion. Therefore, during the process of X1 becoming X2, it is necessary to supplement the length. However, by setting the membrane stretching end assembly 2330, such as... Figure 10 and Figure 11 As shown, the blue film will cause the pulling rod 241 to float upwards. The pulling rod 241 achieves upward floating during the floating stroke through the film pulling end assembly 2330, combined with... Figure 16 and Figure 17 To understand this, previous technical solutions required X3 to supplement the height. However, by floating the pulling rod 241, the delayed lifting height is compensated, so the X2 segment that should have increased is offset by the free upward movement of the pulling rod, thus achieving X1 = X2. Furthermore, during the upward movement of the pulling rod 241, the elastic element 2351 holds the pulling rod 241, providing sufficient tension for the blue film, i.e., the tension of the battery blue film is provided by the tension spring. In this way, air bubbles and wrinkles can be prevented during battery wrapping, improving wrapping quality and yield; and the blue film is prevented from prematurely detaching from the pulling end assembly, preventing wrinkles during battery wrapping and improving wrapping yield.

[0076] The third frame 311 is also equipped with a cutting mechanism for cutting the blue film. The cutting mechanism is existing technology and will not be described in detail. After the battery pack film is completed, the cutting mechanism of the third frame 311 cuts the blue film.

[0077] Reference Figure 10 and Figure 11 At this time, the wrapping equipment is performing the fourth action. The lifting drive component 220 drives the wrapping tension component 230 to move upward, and then performs a film-pulling action on the cut blue film. The subsequent actions are as follows: Figure 10 and Figure 11 As shown.

[0078] After that, the first action can be performed to extend the floating connector 2343, and this process can be repeated.

[0079] In the aforementioned film-coating tension component, film-pulling mechanism, and film-coating equipment, during the film-pulling of the blue film (i.e., the fourth action of the film-coating equipment), the film-pulling end assembly needs to be laterally moved to adhere the film. Therefore, a lateral moving assembly 2320 is also provided between the first base 2310 and the film-pulling end assembly 2330. The film-pulling end assembly 2330 is mounted on the lateral moving assembly 2320, which is connected to the first lifting guide rail 2342. The vertical movement stroke of the lateral moving assembly 2320 is a floating stroke.

[0080] Specifically, the transverse component 2320 includes a second base 2321, a second drive source 2323, and a first transverse guide rail 2322. The second base 2321 is connected to the first lifting guide rail 2342, allowing the second base 2321 to move up and down along the first lifting guide rail 2342. The vertical movement of the second base 2321 is a floating stroke. A lower limit block 2311 is fixed to the lower part of the first base 2310 to control the lower limit of the second base 2321. When the lifting drive component 220 drives the film tension component 230 to move upward, the lower limit block 2311 presses against the second base 2321 and moves it upward. The film stretching end component 2330 is provided with an upper limit block 2324. The floating joint 2343 presses against the upper limit block 2324 when extended, and passes through the upper limit block 2324 when retracted. The maximum floating height of the membrane end assembly 2330 is defined as follows: during the floating process, the position where the upper limit block 2324 contacts the floating joint 2343 is the maximum floating height of the membrane end assembly 2330. Specifically, the upper limit block 2324 is fixed to the upper part of the second base 2321. When the floating joint 2343 extends, it presses against the upper limit block 2324 and moves downward, causing the second base 2321 to move downward along the floating stroke. The first transverse guide rail 2322 is provided on the second base 2321, and the membrane end assembly 2330 is connected to the first transverse guide rail 2322 so that the membrane end assembly 2330 can move laterally along the first transverse guide rail 2322. The second drive source 2323 is installed on the second base 2321, and the drive end of the second drive source 2323 is connected to the membrane end assembly 2330 to drive the membrane end assembly 2330 to move laterally.

[0081] like Figure 3As shown, the lower end of the tension spring is connected to the first base 2310, and the upper end of the tension spring is connected to the second base 2321.

[0082] In this embodiment, the second drive source 2323 is a cylinder, and the cylinder seat of the second drive source 2323 is mounted on the second base 2321. The film-stretching end assembly 2330 is connected to the piston rod of the second drive source 2323. In some embodiments, the second drive source 2323 is an electric push rod or other conventional linear drive assembly.

[0083] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A film tensioning component, characterized in that: include First base; A membrane-pulling end assembly is used to connect to the end of a membrane-pulling rod to drive the membrane-pulling rod to perform a membrane-pulling action. The membrane-pulling end assembly has a floating stroke that moves up and down on the first base. A connector drive assembly having an extendable and retractable floating connector located above the film-stretching end assembly. When the floating connector extends, it presses against the film-stretching end assembly as it moves downward along the floating stroke to the wrapping position and restricts the offset of the film-stretching end assembly. When the floating connector retracts, it disengages from the film-stretching end assembly, allowing the film-stretching end assembly to have upward floating space during the floating stroke. as well as A tension assembly includes at least one elastic element, one end of which is connected to the first base and the other end of which is connected to the film-pulling end assembly, so as to apply an elastic force to the film-pulling end assembly during the upward floating process of the film-pulling end assembly, thereby driving the film-pulling rod through the film-pulling end assembly to provide film-coating tension; The connector drive assembly includes a first drive source and a first lifting guide rail. The first lifting guide rail is disposed on the first base. The membrane stretching end assembly is directly or indirectly connected to the first lifting guide rail so that the membrane stretching end assembly can move up and down along the first lifting guide rail. The first drive source is mounted on the first base. The floating connector is connected to the drive end of the first drive source to realize up and down movement. A lower limit block is fixed at the lower part of the first base to control the lower limit of the membrane stretching end assembly. The membrane stretching end assembly is provided with an upper limit block. When the floating connector is in the extended state, it presses against the upper limit block. When the floating connector is in the retracted state, the upper limit block controls the maximum floating height of the membrane stretching end assembly. A transverse moving component is also provided between the first base and the membrane stretching end assembly. The membrane stretching end assembly is mounted on the transverse moving component. The transverse moving component is connected to the first lifting guide rail. The vertical movement stroke of the transverse moving component is the floating stroke. The elastic element is disposed below the membrane end assembly, the lower end of the elastic element is connected to the first base, and the upper end of the elastic element is connected to the membrane end assembly. The elastic element is a tension spring. The lateral movement assembly includes a second base, a second drive source, and a first lateral movement guide rail. The second base is connected to the first lifting guide rail so that the second base can move up and down along the first lifting guide rail. The up and down movement stroke of the second base is the floating stroke. The upper limit block is fixed on the upper part of the second base. The first lateral movement guide rail is disposed on the second base. The film-pulling end assembly is connected to the first lateral movement guide rail so that the film-pulling end assembly can move laterally along the first lateral movement guide rail. The second drive source is installed on the second base, and the drive end of the second drive source is connected to the film-pulling end assembly to drive the film-pulling end assembly to move laterally.

2. The film tensioning component according to claim 1, characterized in that: The first driving source is a tension cylinder, the cylinder seat of the tension cylinder is mounted on the first base, and the floating joint is connected to the piston rod of the tension cylinder.

3. A membrane stretching mechanism, characterized in that: include The second frame includes two uprights, which are spaced apart along the width of the second frame. as well as A film-pulling rod extends from one of the upright plates to the other upright plate, and at least one end of the film-pulling rod is equipped with a film-coating tension member according to any one of claims 1 to 2. The film-pulling end assembly includes a third base, which is directly or indirectly connected to the first lifting guide rail, and the end of the film-pulling rod is connected to the third base.

4. The film stretching mechanism according to claim 3, characterized in that: The second frame is provided with a lifting drive assembly, which includes two sets of second lifting guide rails respectively disposed on the two upright plates and a third drive source for driving the film tension component to move up and down along the second lifting guide rails. The first base is slidably connected to the second lifting guide rails, and the third drive source is connected to the first base through a transmission component.

5. A coating device, characterized in that: include The film-pulling mechanism according to claim 3 or 4, wherein the film-pulling mechanism has a battery input channel; A feeding mechanism is used to push the battery into the battery input channel; The coating mechanism includes a third frame, on the side of the third frame near the second frame, an upper pressure roller and a lower pressure roller are provided, a battery output channel is formed between the upper pressure roller and the lower pressure roller, the battery output channel is connected to the battery input channel to receive the battery transmitted by the battery input channel and perform coating, and there is an operating space between the battery output channel and the battery input channel for the film pulling rod to pull the film.

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