Battery cell protection film supply device and battery cell film wrapping device

Abstract

The utility model relates to the manufacturing field of secondary battery especially relates to a kind of electric core protective film supply device and electric core film coating device.Electric core protective film supply device includes protective film tray, the placement site of electric core protective film is provided on the protective film tray, more than two brush film separating components for separating the adhered electric core protective film are provided around the placement site, the brush film separating component includes brush mounting seat, more than two brush rows are provided on the brush mounting seat along the corresponding edge of electric core protective film, each brush row includes bristle arranged in vertical row, the projection of the end of bristle intrudes into the placement site in horizontal plane, and adjacent brush row is arranged with interval.The structure of the utility model is more conducive to the separation of adhered electric core protective film, and by dispersing stress position, it can avoid the problem that electric core protective film appears wrinkle due to local excessive stress, so as to maintain the good form of electric core protective film.

Description

Technical Field

[0001] This utility model relates to the field of secondary battery manufacturing, and in particular to a cell protective film supply device and a cell coating device. Background Technology

[0002] After the adapter plates are welded, the surface of the battery cell is exposed and easily damaged, so it needs to be coated for protection. Mylar film is commonly used for cell coating, which provides protection (such as scratch resistance) and insulation. Therefore, wrapping the battery cells with Mylar film is a crucial production step in the manufacturing process of power batteries.

[0003] Currently, the coating of battery cells mainly relies on mechanical devices. During the coating process, multiple layers of protective film are stacked at a fixed position. A robotic arm then picks up the protective film from this position and delivers it to the coating station to wrap the battery cell. During this process, the stacked protective films may stick together due to factors such as negative pressure. The robotic arm often picks up two or more protective films at once, requiring the coating process to be paused to process the excess film, resulting in low efficiency.

[0004] To address the challenge of robotic arms grasping two or more battery cell protective films at once, an effective method is to place brushes around the protective films. During the grasping process, these brushes force the non-surface protective films (in stacked protective films, the topmost layer is the surface layer, and the rest are non-surface layers; these non-standard surface layers change with use, but only one surface layer exists at a time) to separate from the surface protective film. However, improper brush placement can lead to poor separation or the brushes affecting the shape of the grasped protective films, resulting in unevenness when the films are placed at the wrapping station. Utility Model Content

[0005] One of the objectives of this invention is to provide a battery cell protective film supply device to solve the problems of poor separation effect and influence on the shape of the battery cell protective film when using a brush to separate the battery cell protective film during the gripping process.

[0006] Meanwhile, the purpose of this utility model is also to provide a battery cell coating device using the above-mentioned battery cell protective film supply device.

[0007] To solve the above problems, the battery cell protective film supply device of this utility model adopts the following technical solution:

[0008] A battery cell protective film supply device includes a protective film tray with a placement position for the battery cell protective film. Around the placement position are two or more brush separation assemblies for separating adhered battery cell protective films. Each brush separation assembly includes a brush mounting base with two or more brush rows arranged along the corresponding edge of the battery cell protective film. Each brush row includes vertically arranged bristles, the ends of which project into the placement position on a horizontal plane. Adjacent brush rows are spaced apart.

[0009] The beneficial effects of the battery cell protective film supply device: This utility model's battery cell protective film supply device is an improved invention. By setting a protective film tray and a placement position on the tray for placing the battery cell protective film, the battery cell protective film to be used can be stacked on the placement position during use. Since the horizontal projection of the bristle ends of the brush film separating assembly around the placement position penetrates into the placement position, when the underside of the battery cell protective film being grasped has adhered protective film, the bristles can "sweep off" the adhered protective film, separating it from the battery cell protective film to be grasped. Since the brush mounting base of the brush film separating assembly has two or more brush rows along the corresponding edge of the battery cell protective film, and the adjacent brush rows are arranged at intervals, when the number of bristles acting on the battery cell protective film at the same time is certain, the brush film separating assembly will act on the battery cell protective film at more points (along the extension direction of the edge of the battery cell protective film). On the one hand, it is more conducive to the separation of adhered battery cell protective film, and on the other hand, it can make the force on the battery cell protective film more dispersed. Because the protective film of the battery cell is blocked by the brush bristles throughout the process before leaving the supply device, the problem of wrinkles caused by excessive local stress on the protective film can be avoided by dispersing the stress points, thus maintaining the good shape of the protective film.

[0010] The battery cell coating device of this utility model adopts the following technical solution:

[0011] The battery cell coating device includes a battery cell protective film supply device and a gripping robot arm capable of gripping the battery cell protective film from the battery cell protective film supply device. The battery cell protective film supply device includes a protective film tray with a placement position for the battery cell protective film on the protective film tray. Around the placement position are two or more brush separating components for separating the adhered battery cell protective film. The brush separating components include a brush mounting base with two or more brush rows arranged along the corresponding edge of the battery cell protective film on the brush mounting base. Each brush row includes bristles arranged in a vertical row. The projection of the ends of the bristles on the horizontal plane penetrates into the placement position. Adjacent brush rows are spaced apart.

[0012] Beneficial effects of the battery cell coating device: The battery cell coating device of this utility model is an improved invention. In the battery cell coating device of this utility model, the battery cell protective film supply device sets a protective film tray and a placement position for placing the battery cell protective film on the protective film tray. In use, the battery cell protective film to be used can be stacked on the placement position. Since the horizontal projection of the bristle tip of the brush film separating assembly set around the placement position penetrates into the placement position, when the underside of the battery cell protective film being grasped has battery cell protective film adhering, the bristles can "sweep off" the adhering protective film, separating it from the battery cell protective film to be grasped. Because the brush separating assembly has two or more brush rows along the corresponding edge of the battery cell protective film on the brush mounting base, and adjacent brush rows are spaced apart, when the number of brush bristles acting on the battery cell protective film simultaneously is constant, the brush separating assembly will act on the battery cell protective film at more points (along the extension direction of the edge of the battery cell protective film). This is more conducive to the separation of adhered battery cell protective films, and also allows the force on the battery cell protective film to be more dispersed. Since the battery cell protective film being grasped needs to be blocked by the brush bristles throughout its journey before leaving the supply device, dispersing the force points can avoid problems such as excessive local stress on the battery cell protective film, which could lead to wrinkles, thus maintaining a better shape of the battery cell protective film. Attached Figure Description

[0013] Figure 1 This is a perspective view of one embodiment of a battery cell protective film supply device;

[0014] Figure 2 This is a top view of one embodiment of the battery cell protective film supply device;

[0015] Figure 3 yes Figure 2 A three-dimensional view of the brush-type membrane separation component in the image;

[0016] Figure 4 yes Figure 2 Top view of the brush-type film-separating assembly;

[0017] Figure 5 yes Figure 4 A schematic diagram of the structure of the brush mounting base;

[0018] Figure 6 yes Figure 4 A schematic diagram of the brush pack structure.

[0019] In the diagram: 1. Protective film tray; 101. Placement position; 2. Brush film separating assembly; 201. Brush mounting base; 202. Brush row; 203. Brush bristles; 204. Connecting part; 205. Column; 206. Fixing strip; 207. Top screw; 208. Pressing screw; 3. Corner positioning assembly; 301. Positioning plate; 4. Short side limit block; 5. Handle. Detailed Implementation

[0020] The features and performance of this utility model will be further described in detail below with reference to specific embodiments.

[0021] Applying a brush to the edge of the cell protective film (Mylar membrane) being grasped is a relatively ideal way to prevent the cell protective film from sticking together. The core principle of the brush-driven separation of membranes is to disrupt the interlayer seal and introduce air. When in operation, the brush acts on the edge of the membrane, and its bristles slightly insert into the edge of the gap between the uppermost membrane (surface protective film) and the adjacent lower membrane (non-surface protective film). This insertion can create a tiny channel or gap at the edge of the membrane layers that would otherwise form a seal. This channel or gap allows external air to freely enter the interlayer interface, thereby breaking the force of membrane adhesion. In addition, the oscillation of the bristles will produce a slight vibration or disturbance to the membrane edge, which also helps to overcome the small adhesive forces, making the membrane layers easier to separate.

[0022] The above analysis of the basic principle of brush-based membrane adhesion breaking reveals that the key factor in successfully breaking adhesion is the ability to quickly open channels between the edges of the adhered membranes. This invention, with the same number of bristles, increases the number of points of application to the battery cell protective film, thereby opening multiple channels along the edge of the protective film and achieving rapid separation of adhered membranes. Furthermore, by dispersing the bristles along the edge of the protective film, the force applied to a single location is reduced, resulting in gentler stress distribution and preventing significant morphological changes (such as wrinkling) caused by excessive stress concentration, which could negatively impact subsequent battery cell coating processes. Based on the above inventive concept, this invention proposes technical solutions for a battery cell protective film supply device and a battery cell coating device.

[0023] Based on the above inventive concept, the specific implementation of the battery cell protective film supply device of this utility model is as follows:

[0024] like Figure 1 , Figure 2 As shown, the battery cell protective film supply device includes a protective film tray 1, which serves as the foundation of the entire device. All other auxiliary components are mounted on the protective film tray 1. To ensure a certain level of reliability, the protective film tray can be made of metal. Considering requirements such as lightweight and weather resistance, the metal material can specifically be aluminum alloy, stainless steel, etc. Of course, in some cases, the protective film tray 1 can also be manufactured using injection molding. In this case, the protective film tray 1 can also be made of materials such as plastic or resin; this will not be elaborated further here.

[0025] The protective film tray 1 is provided with a placement position 101 for the battery cell protective film. This "placement position" is the location for placing the battery cell protective film. In use, the battery cell protective films to be used can be stacked and placed on the placement position 101 for the corresponding robotic arm to grasp. In some typical embodiments, the robotic arm can grasp the battery cell protective film by negative pressure adsorption or adhesion. The relevant structure of the robotic arm is prior art and will not be described in detail here.

[0026] To prevent the surface protective film from adhering to adjacent non-surface protective films when picked up, two or more brush-type film separating assemblies 2 are provided around the placement position 101 to separate the adhered cell protective films. The brush-type film separating assemblies 2 are located on the periphery of the placement position 101 and can act on the edge of the cell protective film to promote the separation of the adhered cell protective films. Figure 1 , Figure 3 As shown, to facilitate installation, the brush-separating assembly 2 includes a brush mounting base 201. The brush mounting base 201 serves two functions: firstly, it connects to and is fixed to the protective film tray 1; secondly, it mounts the brushes. Two or more brush rows 202 are arranged along the corresponding edges of the battery cell protective film on the brush mounting base 201. A "brush row" is a row composed of brush bristles, such as... Figure 3 , Figure 4 and Figure 6 As shown, each brush row 202 includes brush bristles 203 arranged in a vertical row. The projection of the end of the brush bristles 203 in the horizontal plane penetrates into the placement position 101. Therefore, after the battery cell protective film is placed in the placement position 101, the brush bristles 203 and the battery cell protective film intersect in the vertical projection. When the battery cell protective film is lifted upward, the brush bristles 203 will act on the edge of the battery cell protective film.

[0027] In the same brush separation assembly 2, adjacent brush rows 202 are arranged at intervals. This creates air intake points on both sides of each brush row 202, allowing for faster disintegration of the adhesive bonds between the protective films. Furthermore, the multiple rows of spaced brush rows 202 increase the number of points of contact with the protective films, and the probability of failure to break the bonds at all points is extremely low. This avoids the possibility of the protective film failing to separate due to a single point of adhesion failure. Of course, in actual production, the number of brush rows 202 in each brush separation assembly 2 can be designed according to actual needs; for example, it can be as follows: Figure 1 As shown, it contains 2 rows of brushes, but it can also have 3, 4, or more rows of brushes. The number of brushes in the same brush separation assembly 2 is not discussed here.

[0028] Taking into account both the effect of breaking adhesion and the size of the brush film separating component 2, in a preferred embodiment, such as Figure 4 As shown, the spacing L between adjacent brush rows of the brush separating assembly 2 is 6mm-10mm. Specifically, for example, this spacing can be 6mm, 7mm, 7.5mm, 9mm, or 10mm. Of course, in actual production applications, the spacing between adjacent brush rows can also be determined by empirical values, which will not be elaborated here.

[0029] To ensure that the brush bristles 203 can break the adhesion while applying relatively gentle resistance to the battery cell protective film, the length of the brush bristle 203 tip penetrating the placement position on the horizontal plane should be controlled. In a preferred embodiment, the length of the brush bristle tip penetrating the placement position on the horizontal plane is 2mm-5mm. Specifically, this length can be, for example, 2mm, 2.5mm, 3.5mm, or 5mm.

[0030] The number of brush separating film assemblies 2 arranged along the same side of the battery cell protective film should be reasonable, so as to balance the effectiveness of breaking adhesion and avoid the overall structure of the device being too complicated. In addition, setting too many brush separating film assemblies 2 may also cause inconvenience to the placement of the battery cell protective film to the placement position. Therefore, in a preferred embodiment, at least two brush separating film assemblies 2 are arranged at intervals on the same side of the placement position 101, and the distance N between two adjacent brush separating film assemblies 2 is 100mm-200mm. Specifically, the value of N can be, for example, 100mm, 110mm, 130mm, 150mm, 160mm or 200mm.

[0031] Furthermore, if the distance between the top of the brush, i.e. the distance between the uppermost brush and the protective film tray 1, is too high, it may cause the battery cell protective film to fall off to the position of the protective film tray 1, resulting in insulation wrinkles and other phenomena. If the distance is too small, it may cause the battery cell protective film to fail to separate in time. Therefore, this utility model has optimized the range of the vertical distance P between the highest brush bristle in each brush row 202 and the protective film tray 1. The range is 30mm-60mm. Specifically, the range can be, for example, 30mm, 35mm, 50mm, 55mm, 60mm, etc.

[0032] In a preferred embodiment, such as Figure 5As shown, the brush mounting base 201 includes a connecting portion 204 connected to the protective film tray and a column 205 extending upward from the connecting portion. The brush array 202 is mounted on the side of the column near the placement position. The connecting portion 204 enables relative independence between the brush mounting base 201 and the protective film tray 1, forming an assembled structure, which simplifies the manufacturing process of the device. By providing the column 205, the brush array 202 can be supported over a wider range in the height direction, making the mounting structure of the brush array 202 more reliable. In fact, in some other embodiments, the column 205 can be replaced by a support platform, in which case the brush array 202 can be inserted into the support platform for mounting. Figure 1 In the illustrated embodiment, the connecting portion 204 adopts a plate-like structure, and the column 205 is located between the two ends of the connecting portion, so that the entire brush mounting base 201 forms an inverted "T" shape. Of course, based on Figure 1 As illustrated in the embodiments shown, those skilled in the art should understand that in other embodiments, it is also entirely feasible for the brush mounting base 201 to be L-shaped.

[0033] The arrangement of the brush array 202 can be achieved through methods such as tail bonding or weaving, but these methods may lead to problems such as low manufacturing efficiency and poor product reliability. Therefore, in a preferred embodiment, the brush array 202 further includes a fixing strip 206 for fixing the tail of the bristles, and the fixing strip 206 is fixedly connected to the column. The fixing strip 206 can arrange the bristles in rows by clamping, bonding, etc., and by using the fixing strip 206, it is easier to fix the brush array 202 to the brush mounting base 201. For example, in Figure 1 In the illustrated embodiment, the column 205 is provided with a vertically extending slot, and the fixing strip 206 is installed in the slot. Simultaneously, a set screw 207 is provided on the column 205 extending into the slot, with one end of the set screw 207 pressing against the fixing strip 206 to secure it. Although the fixing strip 206 and the brush mounting base 201 are connected via a slot in the above embodiment, those skilled in the art should understand that in other embodiments, fasteners such as screws can also be used to connect the fixing strip and the brush mounting base. Of course, in this case, the connection is still detachable. In some cases, the fixing strip can also be directly welded to the brush mounting base, forming a non-detachable connection structure. Furthermore, even with the slot, using a set screw to fix the fixing strip is not necessary. For example, the fixing strip can be directly interference-fitted into the slot, achieving the same fixation relative to the brush mounting base.

[0034] If the relative positions of the brush film separating assembly 2 and the protective film tray 1 are set to a single structure, extremely high precision requirements will be placed on the processing of the connection structure between the brush film separating assembly 2 and the protective film tray 1. Furthermore, the supply device of this invention will only be able to supply one type of battery cell protective film, and will not be universally applicable. To solve the above problems, in a preferred embodiment, the brush film separating assembly 2 is connected to the protective film tray 1 in an adjustable position in the direction approaching and away from the placement position 101. For example, the protective film tray 1 and the brush film separating assembly 2 can be fixed by a clamping screw, and at least one hole that mates with the clamping screw 208 has a larger dimension in the direction approaching and away from the placement position than the clamping screw, thereby achieving adjustable relative positions between the protective film tray and the brush film separating assembly. Figure 1 The diagram shows a typical structure that enables the above installation, wherein the hole on the connecting part 204 that mates with the clamping screw 208 is designed as an elongated hole, so that the brush mounting base can be adjusted into place in the corresponding direction and then clamped and fixed by the clamping screw 208.

[0035] To ensure a relatively definite positional relationship between the battery cell protective film and the robotic arm, and to facilitate precise repositioning of the non-surface layer protective film when grasped, a preferred embodiment includes positioning components for positioning the battery cell protective film around the placement position 101. These positioning components are adjustable in position towards and away from the placement position. For example, the positioning components include corner positioning components 3 for positioning the corners of the battery cell protective film. Each corner positioning component includes two positioning plates 301 arranged perpendicularly to each other, both of which are adjustable in position towards and away from the corner positioning components. Figure 1 In the embodiment shown, the positioning plate 301 is specifically an L-shaped plate. In order to achieve position adjustment, its connection with the protective film tray 1 and the position adjustment structure can be the same as the brush mounting base, which will not be described in detail here.

[0036] Furthermore, based on the above embodiments, Figure 1 In the embodiment shown, a short-side limiting block 4 is also provided at the notch (built-in structure of the battery cell protective film) on the protective film tray corresponding to the battery cell protective film, so as to limit the short side where the notch is located. The short-side limiting block 4 is also adjustable in the direction of approaching and moving away from the placement position. Its connection and adjustment structure with the protective film tray is the same as that of the brush mounting base, which will not be described in detail here.

[0037] The battery cell protective film supply device of this utility model is an accessory to the battery cell coating device, and it often needs to be handled during production. Therefore, in a preferred embodiment, such as... Figure 1 As shown, handles 5 are also provided at the two opposite edges of the protective film tray. The specific structure of the handles can be set arbitrarily as needed, which will not be elaborated here.

[0038] Specific embodiments of the battery cell coating device of this utility model:

[0039] The battery cell coating device of this utility model includes a battery cell protective film supply device and a film-grabbing robot that can grasp the battery cell protective film from the battery cell protective film supply device. The structure and arrangement of the film-grabbing robot are existing technologies and will not be described in detail here. The battery cell protective film supply device is the battery cell protective film supply device of this utility model. Since its structure and working principle have been described in detail above, they will not be described in detail here.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A battery cell protective film supply device, comprising a protective film tray, wherein the protective film tray has a placement position for the battery cell protective film, and two or more brush separation assemblies are arranged around the placement position for separating adhered battery cell protective films, wherein the brush separation assembly includes a brush mounting base, characterized in that, The brush mounting base has two or more brush rows along the corresponding edge of the battery cell protective film. Each brush row includes brush bristles arranged in a vertical row. The projection of the end of the brush bristles on the horizontal plane extends into the placement position. Adjacent brush rows are arranged at intervals.

2. The battery cell protective film supply device according to claim 1, characterized in that, The spacing between adjacent brush rows of the brush separation assembly is 6mm-10mm.

3. The battery cell protective film supply device according to claim 1 or 2, characterized in that, The number of brush rows in the brush separation assembly is 2-4 rows.

4. The battery cell protective film supply device according to claim 1 or 2, characterized in that, The length of the bristle tip of the brush-separating assembly that penetrates the placement position on the horizontal plane is 2mm-5mm.

5. The battery cell protective film supply device according to claim 1 or 2, characterized in that, At least two of the brush film separating assemblies are spaced apart on the same side of the placement position, with a distance of 100mm-120mm between adjacent brush film separating assemblies.

6. The battery cell protective film supply device according to claim 1 or 2, characterized in that, The brush mounting base includes a connecting part connected to the protective film tray and a column extending upward from the connecting part, with the brush array mounted on the side of the column near the placement position.

7. The battery cell protective film supply device according to claim 6, characterized in that, The brush pack also includes a fixing strip for fixing the tail of the brush bristles, and the fixing strip is fixedly connected to the column.

8. The battery cell protective film supply device according to claim 7, characterized in that, The column is provided with a slot extending vertically, and the fixing strip is installed in the slot.

9. The battery cell protective film supply device according to claim 8, characterized in that, The column is provided with a set screw extending into the slot, and one end of the set screw extending into the slot is pressed against the fixing strip to fix it.

10. The battery cell protective film supply device according to claim 1 or 2, characterized in that, The brush-separating assembly is connected to the protective film tray in an adjustable position in directions toward and away from the placement position.

11. The battery cell protective film supply device according to claim 10, characterized in that, The protective film tray and the brush separating assembly are secured by a clamping screw, and at least one hole that mates with the clamping screw is larger than the clamping screw in both the direction of approach and distance from the placement position, so that the relative positions of the protective film tray and the brush separating assembly are adjustable.

12. The battery cell protective film supply device according to claim 1 or 2, characterized in that, A positioning component for positioning the cell protective film is also provided around the placement position. The positioning component includes a corner positioning component for positioning the corner of the cell protective film. The corner positioning component includes two positioning plates arranged perpendicular to each other. The positions of the two positioning plates are adjustable in the direction of approaching and moving away from the corner positioning component.

13. The battery cell protective film supply device according to claim 1 or 2, characterized in that, Short side limiting blocks are respectively provided on both sides of the placement position corresponding to the short side of the battery cell protective film.

14. The battery cell protective film supply device according to claim 1 or 2, characterized in that, The vertical distance between the highest bristle in each brush row and the protective film tray is 30mm-60mm.

15. A battery cell coating apparatus, comprising a battery cell protective film supply device and a gripping robot capable of gripping the battery cell protective film from the battery cell protective film supply device, characterized in that, The battery cell protective film supply device is the battery cell protective film supply device according to any one of claims 1-14.

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