Aluminum plastic film packaging method and system of soft package battery, controller and storage medium

Abstract

The invention discloses an aluminum-plastic film packaging method and system for a soft package battery, a controller and a storage medium, and the method comprises the following steps: shooting an image of a battery cell after film combination in an aluminum-plastic film cavity through a first visual system, obtaining the relative position of the battery cell relative to the aluminum-plastic film cavity, and generating deviation data; calculating the displacement amount of the top sealing mechanism needing to be compensated according to the deviation data through a controller, and calculating the horizontal displacement of the top sealing mechanism needing to move on the X axis and the Y axis according to the compensated displacement amount; and the controller controls the top sealing mechanism to move based on the horizontal displacement so as to finish the top sealing of the battery cell. According to the invention, through a series of steps, accurate alignment of the open slot on the top sealing mechanism and the battery cell tab is ensured in the top sealing process, the abnormal seal thickness caused by position deviation of the open slot and the battery cell tab is avoided, and the hidden failure hidden danger of the soft package battery is reduced.

Description

Technical Field

[0001] This invention relates to an aluminum-plastic film encapsulation method and system for soft-pack batteries, a controller, and a storage medium, belonging to the field of soft-pack battery manufacturing technology. Background Technology

[0002] The packaging quality of pouch batteries is crucial to their long-term safety and reliability. Aluminum-plastic film packaging involves processes such as top sealing (sealing the tabs), side sealing, and tail sealing. Among these, the top sealing process is the most technically challenging and prone to failure. It requires a reliable seal between the metal tabs of the battery cell and the polypropylene (PP) layer of the aluminum-plastic film under thermo-pressing, forming a transitional barrier between metal and polymer materials.

[0003] On existing automated production lines, there is a common, hidden quality problem with a time lag effect: batteries that pass factory inspection occasionally leak and fail at the top sealing tab after being used by customers for a period of time. Summary of the Invention

[0004] To address the shortcomings of existing technologies, one of the objectives of this application is to provide an aluminum-plastic film encapsulation method for pouch batteries, thereby reducing leakage and failure issues that occur during actual use of pouch batteries.

[0005] A method for encapsulating a pouch battery with an aluminum-plastic film includes the following steps:

[0006] The image of the battery cell after it has been laminated in the aluminum-plastic film cavity is captured by the first vision system, and the relative position of the battery cell with respect to the aluminum-plastic film cavity is obtained to generate deviation data.

[0007] The controller calculates the amount of displacement that the top sealing mechanism needs to compensate based on the deviation data, and calculates the horizontal displacement that the top sealing mechanism needs to move on the X and Y axes based on the amount of compensation displacement.

[0008] The controller moves the top sealing mechanism based on the horizontal displacement to complete the top sealing of the battery cell.

[0009] Preferably, it also includes a cell loading step:

[0010] The battery cell loading mechanism picks up the battery cells transported from the incoming material conveyor line and places them at the transfer station.

[0011] The body image of the battery cell at the transfer station is captured by a second vision system to obtain the body information of the battery cell;

[0012] The controller calculates the horizontal displacement and rotation angle that the cell feeding mechanism needs to move on the X and Y axes based on the body posture information.

[0013] The controller moves and rotates the battery cell feeding mechanism based on the horizontal displacement and rotation angle to deliver the battery cell to the aluminum-plastic film cavity.

[0014] This invention also discloses a soft-pack battery aluminum-plastic film packaging system, comprising:

[0015] Top sealing mechanism;

[0016] The first vision system is used to capture images of the battery cell after it has been laminated in the aluminum-plastic film cavity, and to obtain the relative position of the battery cell with respect to the aluminum-plastic film cavity, generating deviation data.

[0017] The controller is communicatively connected to the first vision system and the top sealing mechanism. It is used to calculate the amount of displacement that the top sealing mechanism needs to compensate based on the deviation data, calculate the horizontal displacement that the top sealing mechanism needs to move on the X and Y axes based on the compensated displacement, and control the top sealing mechanism to move based on the horizontal displacement to complete the top sealing of the battery cell.

[0018] Preferred options also include:

[0019] The second vision system is set at a transfer station to capture images of the battery cells being transferred from the incoming material conveyor line to the transfer station and to acquire the body shape information of the battery cells.

[0020] The controller is also connected in communication with the second vision system to calculate the horizontal displacement and rotation angle that the battery cell feeding mechanism needs to move on the X and Y axes based on the body posture information, and to control the movement and rotation of the battery cell feeding mechanism based on the horizontal displacement and rotation angle to deliver the battery cell to the aluminum-plastic film cavity.

[0021] Preferably, it also includes a conveying mechanism for conveying the aluminum-plastic film to the first vision system.

[0022] Preferably, the conveying mechanism includes a rotary conveyor table, which is provided with a plurality of limiting positions distributed at equal angles around its central axis.

[0023] The present invention also discloses a controller applied to a soft-pack battery aluminum-plastic film packaging system. The controller is configured to perform the following steps: acquiring deviation data sent by a first vision system, the deviation data being generated by the first vision system by capturing an image of the battery cell after the film is sealed in the aluminum-plastic film cavity and acquiring the relative position of the battery cell;

[0024] Based on the deviation data, the amount of displacement that the top sealing mechanism needs to compensate is calculated, and the horizontal displacement that the top sealing mechanism needs to move on the X and Y axes is calculated based on the amount of compensation displacement.

[0025] Based on the determined horizontal displacement, the top sealing mechanism is controlled to move in order to complete the top sealing of the battery cell.

[0026] The present invention also discloses a storage medium having a computer program stored thereon, which, when executed by a controller, performs the above-described steps.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. This invention uses a first vision system to acquire the relative position of the battery cell after it is laminated in the aluminum-plastic film cavity, generating deviation data. Simultaneously, the controller calculates the horizontal displacement that the top sealing mechanism needs to move along the X and Y axes based on this deviation data. This ensures that the slot on the top sealing mechanism is accurately aligned with the battery cell tab during the top sealing process, avoiding abnormal seal thickness caused by positional deviations and reducing leakage failures that occur during the actual use of pouch batteries. Attached Figure Description

[0029] Figure 1 This is a flowchart of the aluminum-plastic film encapsulation method for soft-pack batteries.

[0030] Figure 2 Diagram of an aluminum-plastic film encapsulation system for a pouch battery;

[0031] Figure 3 This is a site layout diagram of the packaging system. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] Example:

[0034] The client uses batteries that have passed factory quality inspection, and occasionally leaks occur at the top seal tabs before they reach their service life. Based on this phenomenon, the production side considered various aspects, such as the user scenarios and habits of the clients, and ultimately focused on the alignment deviation in high-speed automated production. Specifically, in high-speed automated production, small systematic errors are introduced in the processes of cell loading, aluminum-plastic film cavity positioning, and fixture wear. This results in a slight deviation in the position of the cell in the aluminum-plastic film after it is installed in the cavity and the film is closed (side seal + bottom seal). This deviation is transmitted to the top sealing process, causing misalignment between the tabs and the top sealing mold, which in turn leads to uneven seal thickness. Under standard heat sealing pressure, the seal thickness in this local area will exceed the design limit. The excessively thick encapsulation layer causes uneven heating and insufficient melting (sol) of the PP layer. The polymer chains fail to fully interweave and fuse, forming micropores. As a result, during battery cycling, the electrolyte will continuously wet and corrode the weak points of the poorly formed sol. Over time, this eventually leads to the slow penetration of the encapsulation layer, causing chronic leakage, gas expansion, capacity decay, and other performance and safety failures.

[0035] Therefore, this embodiment provides a method for aluminum-plastic film encapsulation of a soft-pack battery, such as... Figure 1 As shown, it includes the following steps:

[0036] The image of the battery cell after lamination in the aluminum-plastic film cavity is captured by the first vision system (a vision system is a mature equipment system that uses cameras, sensors and image processing technology to simulate human visual function), and the relative position of the battery cell with respect to the aluminum-plastic film cavity is obtained to generate deviation data; the deviation data includes the deviation △X1 in the X-axis direction and the deviation △Y1 in the Y-axis direction;

[0037] The controller calculates the amount of displacement that the top sealing mechanism needs to compensate for when its slot and the tab are accurately aligned, based on the deviation data (where △X1 is compensated upwards in the X-axis and △Y1 is compensated in the Y-axis direction), and calculates the horizontal displacement that the top sealing mechanism needs to move in the X-axis and Y-axis based on the compensated displacement.

[0038] The controller moves the top sealing mechanism based on the horizontal displacement to complete the top sealing of the battery cell.

[0039] This method takes into account the relative position of the battery cell to the aluminum-plastic film cavity after the film is sealed, and compensates for the displacement of the top sealing mechanism. This ensures that the slot on the top sealing mechanism is accurately aligned with the battery cell tab, avoids abnormal sealing thickness caused by positional deviation, and reduces leakage failure problems in the actual use of soft-pack batteries.

[0040] This aluminum-plastic film encapsulation method often includes a battery cell loading step. Traditionally, the battery cell loading mechanism directly picks up the battery cells from the incoming material conveyor line (specifically used to transport the battery cells prepared in the previous process) and places them into the aluminum-plastic film cavity. However, due to potential deviations during battery cell transport—for example, a 2° deflection or an overfeeding of 2mm—the battery cell loading mechanism may not be able to accurately load the battery cells into the aluminum-plastic film cavity. Therefore, this embodiment employs a novel battery cell loading step, specifically including:

[0041] The battery cell loading mechanism picks up the battery cells transported from the incoming material conveyor line and places them in a transfer station.

[0042] The second vision system (which, like the first vision system, is a mature equipment system that uses cameras, sensors, and image processing technology to simulate human visual functions) captures images of the battery cell at the transfer station to obtain the cell's posture information. The posture information includes the cell's absolute position information and deflection angle information. The absolute position information includes the cell's position in the XY coordinate system.

[0043] The controller calculates the horizontal displacement and rotation angle that the cell feeding mechanism needs to move on the X and Y axes based on the body posture information.

[0044] The controller moves and rotates the battery cell feeding mechanism based on the horizontal displacement and rotation angle to deliver the battery cell to the aluminum-plastic film cavity.

[0045] This cell loading process replaces the traditional method of directly grabbing cells from the incoming material conveyor line via a cell loading mechanism. Instead, the cells are first placed on a transfer station, and then the second vision system acquires the cell's body shape information. Finally, the controller calculates the horizontal displacement and rotation angle required for the cell loading mechanism to move along the X and Y axes based on the body shape information. This avoids the positional deviation of the cells on the incoming material conveyor line affecting their placement into the aluminum-plastic film cavity, thus ensuring that the cells are accurately delivered to the aluminum-plastic film cavity.

[0046] A soft-pack battery aluminum-plastic film packaging system, such as Figure 2-3 As shown, it includes a top sealing mechanism, a controller, a first vision system, an aluminum-plastic film conveying mechanism, and a battery cell feeding mechanism.

[0047] The controller, top sealing mechanism, and first vision system are all communicatively connected. The first vision system is a mature equipment system that simulates human visual function through cameras, sensors, and image processing technology. The aluminum-plastic film conveying mechanism is used to transport the aluminum-plastic film to the first vision system. In this embodiment, the aluminum-plastic film conveying mechanism is a rotary conveying mechanism, which includes a rotary conveying table with multiple limiting positions evenly distributed around its central axis. Of course, in other embodiments, the aluminum-plastic film conveying mechanism can also be a linear conveying mechanism.

[0048] After the aluminum-plastic film conveying mechanism delivers the aluminum-plastic film to the first vision system, the battery cell loading mechanism picks up the battery cells and places them into the aluminum-plastic film cavity. The side-sealing and tail-sealing mechanisms then complete the side-sealing and tail-sealing processes, thus completing the film assembly. At this point, the first vision system photographs the battery cells in the aluminum-plastic film cavity, accurately measuring the relative positional deviation of the battery cells relative to the cavity, generating deviation data, and sending it to the controller. Based on this data, the controller calculates the displacement that the top-sealing mechanism needs to compensate for, and calculates the horizontal displacement that the top-sealing mechanism needs to move along the X and Y axes based on the compensated displacement. It then drives the top-sealing mechanism, carrying the heat-sealing mold, to move horizontally, ensuring that the slot on the mold is precisely aligned with the battery cell tabs. Finally, the top-sealing mechanism executes standard heat-sealing process parameters, completing a top seal with uniform thickness and reliable sealing.

[0049] The packaging system also includes a second vision system, which, like the first vision system, is a mature equipment system capable of both taking pictures and processing images using image processing algorithms. The second vision system is located at a transfer station. The controller is communicatively connected to the second vision system.

[0050] Unlike traditional methods that use a battery cell loading mechanism to directly grab and place the battery cell into the aluminum-plastic film cavity, in this embodiment, the battery cell loading mechanism first grabs the battery cell to a transfer station. Then, the second vision system photographs the battery cell at the transfer station to obtain the precise position and angle (i.e., body posture information) of the battery cell, and transmits the image to the controller. The controller calculates the amount of displacement that the battery cell loading mechanism needs to compensate for based on the body posture information, and calculates the horizontal displacement that the battery cell loading mechanism needs to move on the X and Y axes based on the amount of compensation displacement. Subsequently, the controller drives the battery cell loading mechanism to move and accurately place the battery cell into the aluminum-plastic film cavity.

[0051] A controller is used in a pouch cell aluminum-plastic film encapsulation system, the controller being configured to perform the following steps:

[0052] Obtain deviation data sent by the first vision system, which is generated by the first vision system by taking an image of the battery cell after it is laminated in the aluminum-plastic film cavity and obtaining the relative position of the battery cell;

[0053] Based on the deviation data, the amount of displacement that the top sealing mechanism needs to compensate is calculated (where △X1 is compensated upwards in the X-axis direction and △Y1 is compensated in the Y-axis direction), and the horizontal displacement that the top sealing mechanism needs to move in the X-axis and Y-axis is calculated based on the compensated displacement.

[0054] Based on the determined horizontal displacement, the top sealing mechanism is controlled to move in order to complete the top sealing of the battery cell.

[0055] The embodiment also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a controller, performs the steps described above. The computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, DVDs, CD-ROMs, microdrives, as well as magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic cards or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0056] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. A method for aluminum-plastic film encapsulation of a soft-pack battery, characterized in that, Includes the following steps: The image of the battery cell after it has been laminated in the aluminum-plastic film cavity is captured by the first vision system, and the relative position of the battery cell with respect to the aluminum-plastic film cavity is obtained to generate deviation data. The controller calculates the amount of displacement that the top sealing mechanism needs to compensate based on the deviation data, and calculates the horizontal displacement that the top sealing mechanism needs to move on the X and Y axes based on the amount of compensation displacement. The controller moves the top sealing mechanism based on the horizontal displacement to complete the top sealing of the battery cell.

2. The aluminum-plastic film encapsulation method for a soft-pack battery according to claim 1, characterized in that, It also includes the cell loading process: The battery cell loading mechanism picks up the battery cells transported from the incoming material conveyor line and places them at the transfer station. The body image of the battery cell at the transfer station is captured by a second vision system to obtain the body information of the battery cell; The controller calculates the horizontal displacement and rotation angle that the cell feeding mechanism needs to move on the X and Y axes based on the body posture information. The controller moves and rotates the battery cell feeding mechanism based on the horizontal displacement and rotation angle to deliver the battery cell to the aluminum-plastic film cavity.

3. A soft-pack battery aluminum-plastic film packaging system, characterized in that, Include: Top sealing mechanism; The first vision system is used to capture images of the battery cell after it has been laminated in the aluminum-plastic film cavity, and to obtain the relative position of the battery cell with respect to the aluminum-plastic film cavity, generating deviation data. The controller is communicatively connected to the first vision system and the top sealing mechanism. It is used to calculate the amount of displacement that the top sealing mechanism needs to compensate based on the deviation data, calculate the horizontal displacement that the top sealing mechanism needs to move on the X and Y axes based on the compensated displacement, and control the top sealing mechanism to move based on the horizontal displacement to complete the top sealing of the battery cell.

4. The soft-pack battery aluminum-plastic film packaging system according to claim 3, characterized in that, Also includes: The second vision system is set at a transfer station to capture images of the battery cells being transferred from the incoming material conveyor line to the transfer station and to acquire the body shape information of the battery cells. The controller is also connected in communication with the second vision system to calculate the horizontal displacement and rotation angle that the battery cell feeding mechanism needs to move on the X and Y axes based on the body posture information, and to control the movement and rotation of the battery cell feeding mechanism based on the horizontal displacement and rotation angle to deliver the battery cell to the aluminum-plastic film cavity.

5. The soft-pack battery aluminum-plastic film packaging system according to claim 3, characterized in that, It also includes a conveying mechanism for conveying the aluminum-plastic film to the first vision system.

6. The soft-pack battery aluminum-plastic film packaging system according to claim 5, characterized in that, The conveying mechanism includes a rotary conveyor table, on which multiple limiting positions are provided at equal angles around its central axis.

7. A controller applied to a soft-pack battery aluminum-plastic film packaging system, characterized in that, The controller is configured to perform the following steps: acquiring deviation data sent by a first vision system, the deviation data being generated by the first vision system by capturing an image of the battery cell after it has been laminated in the aluminum-plastic film cavity and acquiring the relative position of the battery cell; Based on the deviation data, the amount of displacement that the top sealing mechanism needs to compensate is calculated, and the horizontal displacement that the top sealing mechanism needs to move on the X and Y axes is calculated based on the amount of compensation displacement. Based on the determined horizontal displacement, the top sealing mechanism is controlled to move in order to complete the top sealing of the battery cell.

8. A storage medium having a computer program stored thereon, characterized in that, When the program is executed by the controller, it performs the steps of claim 7.

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