Battery cell film coating device

Abstract

The utility model relates to the technical field of lithium cell coating, in particular to a cell coating device. The device comprises an upper rubber roller, a lower rubber roller, a vertical driving mechanism, a battery cell film, a brake and a controller, the vertical driving mechanism is used for driving the upper rubber roller or the lower rubber roller to roll up and down on the front surface or the rear surface of the battery cell for film pasting when the front and rear surfaces of the battery cell move to the inlet of the film coating space; the cell film covers the inlet of the film coating space; when the battery cell enters the film coating space, the battery cell film moves along with the movement of the battery cell, the upper rubber roller and the lower rubber roller roll along with the movement of the battery cell, and the battery cell films are respectively adhered to the upper surface and the lower surface of the battery cell; the brake is connected with the tail end of the lower rubber roller and brakes the lower rubber roller to rotate when powered on. The lower rubber roller is released during power loss; the controller is used for controlling power-on and power-off of the brake. According to the battery cell film coating device, the speed ratio of the driving speed to the rubber roller braking speed can be flexibly controlled, the traction force of a battery cell film is increased, then the attaching force of a blue film and the surface of a battery cell is increased, and the product yield of the battery cell film coating procedure is guaranteed.

Description

Technical Field

[0001] The embodiments of this specification relate to the technical field of lithium battery cell coating, and in particular to a battery cell coating device. Background Art

[0002] Lithium battery cell coating is mainly used to wrap the battery cell with materials such as heat shrink film or stretch film to prevent the battery cell from being affected by the external environment, to achieve sealing and protection of the battery cell, and to ensure the working stability, battery capacity and energy density of the battery cell.

[0003] In the existing cell coating process, the cell is usually pushed to the specified position by a driving device. At this time, the front surface of the cell contacts the cell film, and the rubber roller in contact with the other side of the cell film rolls up and down to make the cell film fit to the front surface of the cell; then the cell is pushed forward, passing between the upper and lower rubber rollers and driving the two rubber rollers to roll, and the two rubber rollers pull the cell film to roll and coat the upper and lower surfaces of the cell respectively. After the upper and lower surfaces are coated, the rear surface of the cell is also coated by rolling the rubber rollers up and down. The rotation speed of the rubber roller in this process depends on the pushing speed of the battery, and it cannot control the traction of the cell film during the coating process, and cannot ensure the close fit between the battery and the cell film. Utility Model Content

[0004] The embodiments of the present specification provide a battery cell coating device, which aims to solve one or more of the above-mentioned problems and other potential problems.

[0005] In order to achieve the above objectives, the following technical solutions are provided:

[0006] The present specification provides a battery cell coating device, comprising an upper glue roller, a lower glue roller, a vertical drive mechanism and a battery cell film, wherein a coating space allowing the battery cell to pass through is formed between the upper glue roller and the lower glue roller, the battery cell film covers the entrance of the coating space and is tightly attached to the same side of the upper glue roller and the lower glue roller; the vertical drive mechanism is used to drive the upper glue roller or the lower glue roller to roll up and down on the front surface of the battery cell when the front surface of the battery cell moves to the entrance of the coating space and contacts the battery cell film, so as to attach part of the battery cell film to the front surface of the battery cell; when the battery cell passes through the coating space, the battery cell film moves with the movement of the battery cell, and the upper glue roller and The lower rubber roller rolls as the battery cell moves, and sticks the battery cell film to the upper and lower surfaces of the battery cell respectively; the vertical drive mechanism is also used to drive the upper rubber roller or the lower rubber roller to roll up and down on the rear surface of the battery cell when the film sticking on the upper surface or lower surface of the battery cell is completed, and stick the remaining battery cell film to the rear surface of the battery cell; it also includes a brake and a controller, the brake is connected to the end of the lower rubber roller, and when power is on, the brake locks the lower rubber roller to brake the lower rubber roller from rotating; when power is off, the brake releases the lower rubber roller, and at this time, the lower rubber roller rotates as the battery cell moves; the controller is used to control the power on and off of the brake.

[0007] The battery cell coating device of the embodiment of this specification realizes switching of the rotation mode of the lower rubber roller through the brake. When the brake is energized, the rotation of the lower rubber roller is locked and the rotation speed is reduced. When the battery cell drives the battery cell film to pass through the coating space, the battery cell film located between the lower rubber roller and the lower edge of the front surface of the battery cell generates a certain tension. The battery cell film is adhered to the lower surface of the battery cell as the lower rubber roller rolls, and the adhesion is tighter and firmer, thereby improving the yield rate of the battery cell coating production process. When the brake is de-energized, the lower rubber roller is released, and the rotation of the rubber roller mainly depends on the moving speed of the battery cell, thereby meeting the battery cell coating production process that does not require high tension. The switching of the brake on and off is relatively simple, and can flexibly adapt to different battery cell coating requirements, has high compatibility, and effectively reduces production costs.

[0008] In some embodiments, it also includes a support plate and an extension rod arranged at the axis of the end of the lower rubber roller, and the end of the extension rod passes through the support plate and engages with the brake.

[0009] In some embodiments, the diameter of the extension rod is smaller than the diameter of the lower rubber roller.

[0010] In some embodiments, a portion of the extension rod passing through the support plate is sleeved with a bearing.

[0011] In some embodiments, a key slot is provided at the end of the extension rod, and a mating key matching the key slot is provided on the brake, and the extension rod and the brake are locked by the key slot and the mating key.

[0012] In some embodiments, the brake is also connected to the end of the glue roller.

[0013] In some embodiments, the upper glue roller and the lower glue roller are separated by a certain distance in the direction of conveying the battery cell, and the upper glue roller is located at the end of the upper surface of the battery cell when the film pasting on the lower surface of the battery cell is completed.

[0014] In some embodiments, the upper glue roller and the lower glue roller are spaced apart by a glue roller diameter in the direction of cell conveying.

[0015] In some embodiments, a tension sensor is further included, and the tension sensor is connected to the controller and is used to send a power-off signal to the controller to de-energize the brake when the tension of the battery cell membrane reaches a threshold.

[0016] In some embodiments, a rotation speed sensor is also included for detecting the rotation speed of the upper rubber roller or the lower rubber roller when rolling up and down on the front and rear surfaces of the battery cell. The rotation speed sensor is connected to the controller, and when the rotation speed is less than a speed threshold, a power-off signal is sent to the controller to de-energize the brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the embodiments of the present specification will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present specification are shown by way of example and not limitation.

[0018] Figure 1 A side view of a battery cell coating device according to an embodiment of the present specification is shown;

[0019] Figure 2 Shows Figure 1 Schematic diagram of the cell coating device applying film to the upper and lower surfaces of the cell;

[0020] Figure 3 Shows Figure 1 Schematic diagram of the connection structure between the middle and lower rubber rollers and the brake.

[0021] 1-upper rubber roller, 2-lower rubber roller, 21-extension rod, 211-bearing, 212-key slot, 3-battery cell membrane, 4-brake, 5-support plate.

[0022] In the various drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present specification will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present specification are shown in the accompanying drawings, it should be understood that the present specification can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present specification more thorough and complete, and to fully convey the scope of the present specification to those skilled in the art.

[0024] The term "including" and its variations used in this document represent open inclusion, that is, "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one other embodiment". Terms such as "upper", "lower", "front", and "rear" indicating placement or positional relationships are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the principles of this specification, and do not indicate or imply that the referred elements must have a specific orientation, be constructed or operate in a specific orientation, and therefore should not be understood as limitations on this specification.

[0025] A cell coating device according to an embodiment of the present specification is described in detail below with reference to the accompanying drawings. Figure 1A side view of a battery cell coating device according to an embodiment of the present specification is shown. The battery cell coating device according to the embodiment of the present specification comprises an upper glue roller 1, a lower glue roller 2, a vertical drive mechanism and a battery cell film 3, a coating space allowing the battery cell to pass through is formed between the upper glue roller 1 and the lower glue roller 2, the battery cell film 3 covers the entrance of the coating space and is in close contact with the same side of the upper glue roller 1 and the lower glue roller 2; the vertical drive mechanism is used to drive the upper glue roller 1 or the lower glue roller 2 to roll up and down on the front surface of the battery cell when the front surface of the battery cell moves to the entrance of the coating space and contacts the battery cell film 3, so as to attach part of the battery cell film 3 to the front surface of the battery cell; when the battery cell passes through the coating space, the battery cell film 3 moves with the movement of the battery cell, and the upper glue roller 1 and the lower glue roller 2 are in close contact with the battery cell film 3. The lower rubber roller 2 rolls as the battery cell moves, and sticks the battery cell film 3 to the upper and lower surfaces of the battery cell respectively; the vertical drive mechanism is also used to drive the upper rubber roller 1 or the lower rubber roller 2 to roll up and down on the rear surface of the battery cell when the film sticking on the upper surface or lower surface of the battery cell is completed, and stick the remaining battery cell film 3 to the rear surface of the battery cell; it also includes a brake 4 and a controller, the brake 4 is connected to the end of the lower rubber roller 2, when the power is on, the brake 4 locks the lower rubber roller 2, and brakes the lower rubber roller 2 to rotate; when the power is off, the brake 4 releases the lower rubber roller 2, and at this time the lower rubber roller 2 rotates as the battery cell moves; the controller is used to control the power on and off of the brake 4.

[0026] Among them, Figure 2 As shown, when the cell film 3 covers the entrance of the film coating space, the lower edge of the cell film 3 is lower than the lower rubber roller 2 by a certain distance, which is a reserved length for the film coating on the lower surface and the rear surface of the cell; a cell film reel is provided above the entrance of the film coating space, as shown in FIG. Figure 3 As shown, when the battery cell passes through the coating space, the battery cell film attached to the front surface of the battery cell drives the upper and lower battery cell films to move, the battery cell film located above the upper glue roller 1 is pulled out from the battery cell film shaft and is pressed against the upper surface of the battery cell by the upper glue roller 1, and the battery cell film located below the lower glue roller 2 is pressed against the lower surface of the battery cell by the lower glue roller 1, and the contact surfaces of the battery cell film 3 and the upper glue roller 1 and the lower glue roller 2 generate friction during the movement.

[0027] When the brake 4 loses power, the rotation speed of the lower rubber roller 1 mainly depends on the moving speed of the battery cell. The friction between the battery cell film 3 and the contact surface of the upper rubber roller 1 and the lower rubber roller 2 is a rolling friction. The tension of the battery cell film 3 is limited when the upper and lower surfaces of the battery cell are pasted with the film. When the upper rubber roller 1 and the lower rubber roller 2 are pressed on the battery cell film 3 and rolled, bubbles, wrinkles or loose fit are generated in the battery cell film 3. When the brake 4 is powered on, the rotation of the lower rubber roller 2 connected to the brake 4 is braked, and the rotation speed of the lower rubber roller 2 is reduced. At this time, the battery film 3 located between the lower rubber roller 2 and the lower edge of the front surface of the battery cell is subjected to the force of the battery cell moving forward on one side, and on the other side, it moves by friction with the lower rubber roller 2 with a lower speed. Since the speed of the braked lower rubber roller 2 is lower than the moving speed of the battery cell, there is a moving friction between the battery film 3 and the lower rubber roller 2. This moving friction is greater than the previous rolling friction, which increases the tension of the battery film 3 in the middle. When the lower rubber roller 2 presses the battery film 3 on the lower surface of the battery cell, the fit is tighter, reducing bubbles and wrinkles. Similarly, the brake 4 can also be connected to the end of the upper rubber roller 1 to further increase the fit between the battery film 3 and the upper surface of the battery cell.

[0028] The braking effect of the brake 4 depends on the magnitude of the current of the brake 4. The greater the current of the brake 4, the greater the friction between the brake pad and the brake disc in the brake 4, and the lower the rotation speed of the lower rubber roller 2 engaged with the brake disc. The controller controls the power on, power off, and the magnitude of the current of the brake 4, which can meet the requirements for the film application of different battery cells and battery cell films, has strong compatibility, can also improve the product yield of the battery cell film application process, and reduce production costs.

[0029] In addition, the battery cell film laminating device also includes a support plate 5 and an extension rod 21 arranged at the axis of the end of the lower rubber roller 2, and the end of the extension rod 21 passes through the support plate 5 and engages with the brake disc of the brake 4. The extension rod 21 is added so that when installing the brake 4, there is no need to change the length of the lower rubber roller 2, and there is no need to make major changes to the original rubber roller structure, and it is convenient for replacement and maintenance. The support plate 5 is arranged between the lower rubber roller 2 and the brake 4, and the extension rod 21 rotates in the support plate 5 to increase the supporting force and ensure the connection stability between the lower rubber roller 2 and the brake 4.

[0030] Among them, the diameter of the extension rod 21 is smaller than the diameter of the lower rubber roller 2. The diameter of the extension rod 21 passing through the support plate 5 is small, the contact area with the support plate 5 is small, the rotation is more flexible, and it is convenient to dock with the smaller brake 4, reducing the volume. Specifically, the part of the extension rod 21 passing through the support plate 5 is sleeved with a bearing 211. The bearing 211 has a good bearing capacity, reduces the friction, noise and vibration when the extension rod 21 rotates, and reduces the influence of other factors on the rotation of the lower rubber roller 2. The end of the extension rod 21 is provided with a key slot 212, and the brake disc is provided with a matching key matching the key slot 212. The extension rod 21 and the brake disc are locked by the key slot 212 and the matching key. The extension rod 21 and the brake disc adopt a key slot connection method, which has a simple structure and reliable connection. The matching clearance between the extension rod 21 and the brake disc is small, the precision is high, and the effective transmission of torque is achieved.

[0031] After the film pasting process on the upper and lower surfaces of the battery cell is completed, the vertical driving structure is required to drive the lower glue roller 2 to roll up and down on the rear surface of the battery cell to complete the film pasting on the rear surface of the battery cell. During this process, the battery cell may move forward a certain distance under the rolling action of the lower glue roller 2, so that the film pasting on the rear surface of the battery cell is not tight enough. Therefore, the upper glue roller 1 and the lower glue roller 2 are separated by a certain distance in the direction of battery cell transmission. When the film pasting on the lower surface of the battery cell is completed, the upper glue roller 1 is located at the end of the upper surface of the battery cell. When the lower glue roller 2 rolls on the rear surface of the battery cell, the upper glue roller 1 located at the end of the upper surface of the battery cell plays a certain friction braking role, preventing the battery cell from sliding and ensuring the quality of the film pasting on the rear surface of the battery cell. The distance difference between the upper glue roller 1 and the lower glue roller 2 in the direction of battery cell transmission should not be too large, which is easy to make the inclination angle of the battery cell film 3 too large when it is not pasted, affecting the film pasting effect on the front surface of the battery cell. Therefore, the upper glue roller 1 and the lower glue roller 2 are separated by a distance of a glue roller diameter in the direction of battery cell transmission.

[0032] When the film is pasted on the upper and lower surfaces of the battery cell, in order to prevent the speed of the brake 4 from being too low, which will cause the tension of the battery film 3 to be too large and break, it is necessary to add a tension sensor to detect the tension of the battery film 3 in time, and send a power-off signal to the controller to make the brake 4 lose power when the tension of the battery film 3 reaches a threshold, and adjust the speed of the lower rubber roller 2 in time.

[0033] When the film is applied to the front and rear surfaces of the battery cell, the rolling speed of the lower rubber roller 2 on the surface of the battery cell should not be too slow to prevent the battery film 3 from being torn and broken under the large static friction. Therefore, a speed sensor is also provided to detect the rotation speed of the upper rubber roller 1 or the lower rubber roller 2 when rolling up and down on the front and rear surfaces of the battery cell. When the rotation speed is less than the speed threshold, a power-off signal is sent to the controller to de-energize the brake 4.

[0034] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of this specification. Certain features described in the context of separate embodiments may also be implemented in a single implementation in combination. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

[0035] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0036] The embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A cell coating device, comprising an upper glue roller (1), a lower glue roller (2), a vertical drive mechanism and a cell film (3), wherein a coating space for allowing a cell to pass through is formed between the upper glue roller (1) and the lower glue roller (2), the cell film (3) covers an entrance to the coating space and is in close contact with the same side of the upper glue roller (1) and the lower glue roller (2); the vertical drive mechanism is used to drive the upper glue roller (1) or the lower glue roller (2) on the front surface of the cell when the front surface of the cell moves to the entrance of the coating space and contacts the cell film (3). The upper glue roller (1) and the lower glue roller (2) are configured to roll downward to attach part of the cell film (3) to the front surface of the cell; when the cell passes through the film coating space, the cell film (3) moves with the cell, and the upper glue roller (1) and the lower glue roller (2) roll with the cell, respectively attaching the cell film (3) to the upper and lower surfaces of the cell; the vertical drive mechanism is also used to drive the upper glue roller (1) or the lower glue roller (2) to roll upward and downward on the rear surface of the cell when the film is attached to the upper or lower surface of the cell, so as to attach the remaining cell film (3) to the rear surface of the cell; the characteristic is that It also includes a brake (4) and a controller, wherein the brake (4) is connected to the end of the lower rubber roller (2); when power is on, the brake (4) locks the lower rubber roller (2) and brakes the lower rubber roller (2) to rotate; when power is off, the brake (4) releases the lower rubber roller (2), and the lower rubber roller (2) rotates with the movement of the battery cell; the controller is used to control the power on and off of the brake (4).

2. A battery core coating device according to claim 1, characterized in that: It also comprises a support plate (5) and an extension rod (21) arranged at the axis of the end of the lower rubber roller (2), the end of the extension rod (21) passing through the support plate (5) and engaging with the brake (4).

3. A battery core coating device according to claim 2, characterized in that: The diameter of the extension rod (21) is smaller than the diameter of the lower rubber roller (2).

4. A battery core coating device according to claim 2, characterized in that: The portion of the extension rod (21) that passes through the support plate (5) is sleeved with a bearing (211).

5. The battery core coating device according to claim 2, characterized in that: A key slot (212) is provided at the end of the extension rod (21), and a matching key matching the key slot (212) is provided on the brake (4); the extension rod (21) and the brake (4) are locked via the key slot (212) and the matching key.

6. The battery core coating device according to claim 1, characterized in that: The end of the glue-applying roller (1) is also connected to the brake (4).

7. A battery core coating device according to claim 6, characterized in that: The upper glue roller (1) and the lower glue roller (2) are spaced a certain distance apart in the direction of cell conveyance, and when the film lamination on the lower surface of the cell is completed, the upper glue roller (1) is located at the end of the upper surface of the cell.

8. A battery core coating device according to claim 7, characterized in that: The upper rubber roller (1) and the lower rubber roller (2) are spaced apart by a rubber roller diameter in the direction of cell transport.

9. The battery core coating device according to claim 1, characterized in that: It also comprises a tension sensor, which is connected to the controller and is used to send a power-off signal to the controller to cause the brake (4) to lose power when the tension of the battery film (3) reaches a threshold value.

10. The battery core coating device according to claim 1, characterized in that: It also includes a rotation speed sensor for detecting the rotation speed of the upper rubber roller (1) or the lower rubber roller (2) when rolling up and down on the front and rear surfaces of the battery cell. The rotation speed sensor is connected to the controller and sends a power-off signal to the controller when the rotation speed is less than a speed threshold, causing the brake (4) to lose power.

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