Cutter and battery cell coating device

Abstract

The utility model provides a cutter and a battery cell film coating device, the cutter comprises a cutter body extending along the width direction of an insulating film, the cutter body is provided with hole cutting parts corresponding to explosion-proof valves on one side of a battery cell one by one, and the interior of each hole cutting part is hollow; the cutter body and the hole cutting part can cut off the insulating film, the hole cutting part can cut out notches in the head end and the tail end of the insulating film respectively, and the notches in the head end and the tail end of the insulating film can be connected to form a through hole for exposing an explosion-proof valve. According to the cutter, an insulating film can be cut off through the cutter body and the hole cutting part, the hole cutting part can cut the head end and the tail end of the insulating film to form notches respectively, the notches in the head end and the tail end of the insulating film can be connected to form a through hole for exposing an explosion-proof valve, and therefore cutting of the insulating film can be facilitated; and the coating of the insulating film on the battery core is facilitated, so that the battery core has relatively good practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core processing equipment, in particular to a cutter. The utility model also relates to a battery core coating device having the cutter. Background Art

[0002] Current battery cells, such as blade cells, have explosion-proof valves installed on the side, rather than at the end of the cell. When a cell with this structure experiences thermal runaway, the heat generated will be released to the side, which is different from the traditional two-pole pressure release method, which is very easy to damage other cells in the same group, thus helping to reduce the impact of thermal runaway.

[0003] However, the battery cell with this structure has the problem of difficulty in wrapping the insulating film. Usually, the explosion-proof valve on the side can only be wrapped first, and then the explosion-proof valve position can be manually dug after the wrapping is completed to expose the explosion-proof valve. Or a hole is dug in the insulating film with a mold in advance, and the hole is matched with the explosion-proof valve, so that the explosion-proof valve can be exposed after the wrapping. At this time, it is very difficult to align the hole position with the explosion-proof valve. Therefore, how to optimize the cutter structure so that the insulating film is easy to wrap on the battery cell has become a technical problem that technicians in this field need to solve urgently. Utility Model Content

[0004] In view of this, the utility model aims to provide a cutter to facilitate cutting of an insulating film and to facilitate coating of the insulating film on a battery core.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A cutter for cutting an insulating film used to cover the outer periphery of a battery cell, the cutter comprising a cutter body extending along the width direction of the insulating film, the cutter body being provided with a cutting hole portion corresponding to the explosion-proof valve on one side of the battery cell, and the interior of the cutting hole portion being hollow;

[0007] The cutter body and the hole cutting part can cut the insulating film, and the hole cutting part can cut notches at both ends of the insulating film respectively, and the notches at both ends of the insulating film can be connected to form a through hole for exposing the explosion-proof valve.

[0008] Furthermore, the cut-out portion is arranged in accordance with the shape of the explosion-proof valve, and the width of the cut-out portion is greater than the width of the explosion-proof valve.

[0009] Furthermore, the cutting hole portion is symmetrically arranged on the cutter body with the plane where the cutter body is located as a symmetry plane.

[0010] Furthermore, the explosion-proof valves are two arranged at intervals on the side of the battery cell;

[0011] The cutting hole parts are two and are arranged on the cutter body in a one-to-one correspondence with the explosion-proof valves.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The cutter described in the utility model can cut the insulating film through the cutter body and the cutting hole part. The cutting hole part can cut out notches at the head and tail ends of the insulating film respectively. The notches at the head and tail ends of the insulating film can be connected to form a through hole for exposing the explosion-proof valve. It is not only convenient to cut the insulating film, but also convenient to coat the insulating film on the battery cell, so it has good practicality.

[0014] In addition, the cut hole portion is arranged in accordance with the explosion-proof valve, and the width of the cut hole portion is symmetrical with the width of the explosion-proof valve, which is conducive to improving the exposure effect of the explosion-proof valve. By arranging the cut hole portion symmetrically relative to the cutter body, it is conducive to processing and forming, and it is also conducive to the effect of connecting the gaps formed at both ends of the insulating film into a through hole.

[0015] In addition, another object of the utility model is to provide a battery cell film wrapping device, which is used to wrap an insulating film around the periphery of a battery cell, the battery cell film wrapping device comprises a first rolling unit, a second rolling unit, and a cutting unit, and the cutting unit has a cutter as described above;

[0016] The middle portion of the insulating film is attached to a side of the battery cell opposite to the explosion-proof valve, the first rolling unit is used to cover the insulating film on the upper and lower surfaces of the battery cell, the cutter is used to cut the insulating film, and the second roller unit is used to cover the front and rear ends of the insulating film on a side of the battery cell having the explosion-proof valve, and expose the explosion-proof valve to the through hole.

[0017] Furthermore, the first rolling unit includes a plurality of first rollers rotatably arranged on upper and lower sides of the battery cell;

[0018] As the battery core is transported between the first rollers, the insulating film covers the upper and lower surfaces of the battery core.

[0019] Furthermore, the second rolling unit includes two second rollers that are rotatably arranged, and each of the second rollers is arranged corresponding to the leading end and the trailing end of the insulating film at the target position;

[0020] Each of the second rollers can be driven to move upward or downward, and the leading end or the trailing end of the insulating film can be successively covered on the side of the battery cell having the explosion-proof valve.

[0021] Furthermore, the head and tail ends of the insulating film covering the periphery of the battery core are at least partially overlapped.

[0022] Furthermore, the cutting unit includes a driving part for driving the cutter to move and cut the insulating film.

[0023] Furthermore, the driving part adopts a cylinder.

[0024] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0025] The battery cell wrapping device described in the utility model has the middle part of the insulating film attached to the side of the battery cell opposite to the explosion-proof valve, the first rolling unit rolls the insulating film onto the upper and lower surfaces of the battery cell, the cutter cuts the insulating film, and the second rolling unit wraps the front and rear ends of the insulating film onto the side of the battery cell with the explosion-proof valve, which is beneficial to improving the wrapping efficiency of the battery cell and also beneficial to the exposure of the explosion-proof valve.

[0026] In addition, the structure of the multiple first rollers is simple, easy to arrange and implement, and can support the battery cells in the process of conveying the battery cells while rolling the insulating film, which has a good coating effect. The second roller can successively coat the first and last ends of the insulating film on the side of the battery cell with the explosion-proof valve, which has a good coating effect. The first and last ends of the insulating film in the coated state are at least partially overlapped, which is conducive to improving the coating effect of the insulating film on the battery cell. The drive unit is provided to facilitate driving the cutter to cut the insulating film. The use of a cylinder in the drive unit has the advantages of mature products and good driving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the cutter according to the first embodiment of the utility model;

[0029] Figure 2 This is a schematic structural diagram of the insulating film according to the first embodiment of the utility model;

[0030] Figure 3 It is a structural schematic diagram of the battery core coating device described in Example 2 of the utility model.

[0031] Description of reference numerals:

[0032] 1. Cutter body; 2. Insulating film; 3. First roller body; 4. Battery cell; 5. Second upper roller body; 6. Second lower roller body;

[0033] 101, cutting hole part;

[0034] 201. Gap;

[0035] 401. Explosion-proof valve. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Embodiment 1

[0040] This embodiment relates to a cutter for cutting the insulating film 2 used to cover the outer periphery of the battery cell 4. Figure 1 As shown in the figure, the cutter includes a cutter body 1 extending along the width direction of the insulating film 2, and a cutting hole portion 101 is provided on the cutter body 1 corresponding to the explosion-proof valve 401 on one side of the battery cell 4, and the interior of the cutting hole portion 101 is hollow.

[0041] Among them, the cutter body 1 and the cutting part 101 can cut the insulating film 2, and the cutting part 101 can cut out notches 201 at both ends of the insulating film 2 respectively, and the notches 201 at both ends of the insulating film 2 can be connected to form a through hole for exposing the explosion-proof valve 401.

[0042] The cutter of this embodiment can cut the insulating film 2 through the cutter body 1 and the cutting hole part 101. The cutting hole part 101 can cut out notches 201 at both ends of the insulating film 2 respectively. The notches 201 at both ends of the insulating film 2 can be connected to form a through hole for exposing the explosion-proof valve 401, which is not only conducive to cutting the insulating film 2, but also conducive to the coating of the insulating film 2 on the battery cell 4, so as to have good practicality.

[0043] Based on the above overall introduction, an exemplary structure of the cutter described in this embodiment is as follows: Figure 1 As shown in FIG. 1 , the cutter body 1 is a straight sheet-like structure, and the side thereof facing the insulating film 2 is used for cutting the insulating film 2. Figure 2As shown in the figure, the portion of the insulating film 2 cut by the cutter body 1 is in a straight line, which is conducive to making the insulating film 2 easy to shape at both ends and having a good straight effect. The hole cutting part 101 can cut out a hole that is set in accordance with its own shape. Due to the cutting of the cutter body 1, the hole is divided into two parts, that is, the above-mentioned gap 201 is formed at the both ends of the insulating film 2.

[0044] As a preferred embodiment, the cut-out portion 101 is arranged in the shape of the explosion-proof valve 401, and the width of the cut-out portion 101 is greater than the width of the explosion-proof valve 401. Here, the cut-out portion 101 is arranged in the shape of the explosion-proof valve 401, and the width of the cut-out portion 101 is greater than the width of the explosion-proof valve 401, which is conducive to the explosion-proof valve 401 being exposed to the insulating film 2 in the encapsulated state. It should be noted that the length of the cut-out portion 101 is the same as the length of the explosion-proof valve 401, and is only slightly larger in the width direction.

[0045] When implementing it, Figure 1 As shown in , the cut hole portion 101 is in an oblong shape, and the notches 201 cut out at both ends of the insulating film 2 can be connected to form an oblong through hole, thereby facilitating the exposure effect of the explosion-proof valve 401. Of course, in addition to being in an oblong shape, the cut hole portion 101 can also be in other shapes that are compatible with the explosion-proof valve 401, thereby improving the exposure effect of the explosion-proof valve 401 while ensuring the insulation effect.

[0046] There are two explosion-proof valves 401 arranged at intervals on the side of the battery cell 4, and there are two cutting holes 101 arranged on the cutter body 1 in a one-to-one correspondence with the explosion-proof valves 401. The battery cell 4 with two explosion-proof valves 401 is a common blade battery cell 4, and the two cutting holes 101 are arranged in the cutter to have a better use effect. Of course, in specific implementation, the number and position of the cutting holes 101 can also be adaptively adjusted according to the number and position of the explosion-proof valves 401.

[0047] As a preferred embodiment, the cutting hole portion 101 is symmetrically arranged on the cutter body 1 with the plane where the cutter body 1 is located as the symmetry plane. Figure 1 As shown in the figure, the cutter body 1 is divided into three parts by two cutting hole parts 101, and the ends of the cutter body 1 of each part are connected to the middle position of the ends of the cutting hole parts 101. Such a configuration is not only conducive to the processing and forming of the cutter, but also conducive to the forming of the notches 201 at both ends of the insulating film 2, thereby ensuring the forming effect of the through hole when the two notches 201 are connected.

[0048] When in use, the cutter in this embodiment can cut the continuously conveyed insulating film 2 at intervals along the length direction of the insulating film 2, and obtain an insulating film 2 with notches 201 at both ends. The insulating film 2 can be wrapped on the battery cell 4, and the insulating film 2 is wrapped at both ends on the side of the battery cell 4 with the explosion-proof valve 401, and the explosion-proof valve 401 is exposed through the through hole on the insulating film 2.

[0049] The cutter in this embodiment is not only simple in structure and easy to shape, but also has a good cutting effect on the insulating film 2, which is conducive to the insulating film 2 being coated on the battery cell 4, but also conducive to the exposure of the explosion-proof valve 401, and has a better use effect.

[0050] Embodiment 2

[0051] This embodiment relates to a cell film coating device, which is used to coat an insulating film 2 on the periphery of a cell 4. The cell film coating device comprises a first rolling unit, a second rolling unit, and a cutting unit, and the cutting unit has the cutter in the first embodiment.

[0052] The middle part of the insulating film 2 is attached to the side of the battery cell 4 opposite to the explosion-proof valve 401, the first rolling unit is used to cover the insulating film 2 on the upper and lower surfaces of the battery cell 4, the cutter is used to cut the insulating film 2, and the second roller unit is used to cover the head and tail ends of the insulating film 2 on the side of the battery cell 4 with the explosion-proof valve 401, and expose the explosion-proof valve 401 to the through hole.

[0053] The battery cell coating device of the present embodiment has the middle portion of the insulating film 2 attached to the side of the battery cell 4 opposite to the explosion-proof valve 401, the first rolling unit rolls the insulating film 2 onto the upper and lower surfaces of the battery cell 4, the cutter cuts the insulating film 2, and the second rolling unit coats the front and rear ends of the insulating film 2 onto the side of the battery cell 4 having the explosion-proof valve 401, which is beneficial to improving the coating efficiency of the battery cell 4 and also beneficial to the exposure of the explosion-proof valve 401.

[0054] Based on the above overall introduction, an exemplary structure of the battery cell coating device in this embodiment is as follows: Figure 3 As a preferred embodiment, the first rolling unit includes a plurality of first rollers 3 rotatably arranged on the upper and lower sides of the battery cell 4. The second rolling unit includes two second rollers rotatably arranged, each second roller being arranged corresponding to the head end and the tail end of the insulating film 2 at the target position.

[0055] When implementing it, for example Figure 3As shown in the figure, three first rollers 3 are rotatably provided on both upper and lower sides of the battery cell 4, and the upper and lower multiple first rollers 3 are rotatably provided on the frame respectively. The insulating film 2 is unwound in the vertical direction, and is transported downward on the right side of the multiple first rollers 3. The battery cell 4 is located on the right side of the insulating film 2, and the battery cell 4 is driven to move leftward along the arrow direction in the figure, so that the side of the battery cell 4 opposite to the explosion-proof valve 401 is in contact with the insulating film 2. As the battery cell 4 moves between the two rows of first rollers 3, the multiple first rollers 3 rotate respectively, and the insulating film 2 on the upper and lower sides of the battery cell 4 is rolled by the upper and lower rows of first rollers 3 and covered on the upper and lower surfaces of the battery cell 4.

[0056] In this embodiment, each second roller body can be driven to move upward or downward, and the leading end or the trailing end of the insulating film 2 is successively covered on the side of the battery cell 4 having the explosion-proof valve 401. For the convenience of description, the second roller body disposed on the upper side is referred to as the second upper roller body 5, and the second roller body disposed on the lower side is referred to as the second lower roller body 6. The second upper roller body 5 and the second lower roller body 6 are respectively rotatably disposed on corresponding mounting seats, and the frame is respectively provided with driving cylinders for connecting with each mounting seat, so as to respectively drive the corresponding mounting seat to drive the second roller body to move up and down.

[0057] Among them, when the battery cell 4 moves to the left and stops moving, the second upper roller 5 and the second lower roller 6 are respectively arranged at the upper and lower parts of the right side of the battery cell 4. At this time, the second lower roller 6 can roll the head end of the insulating film 2 by rotating during the upward movement, so that it is covered on the bottom part of the side with the explosion-proof valve 401.

[0058] Then, the second upper roller 5 can roll the end of the insulating film 2 by rotating during the downward movement, so that it is coated on the top part of the side with the explosion-proof valve 401. Preferably, the head and tail ends of the insulating film 2 coated on the periphery of the battery cell 4 are at least partially overlapped. Such a configuration is conducive to improving the coating strength of the insulating film 2 on the periphery of the battery cell 4, thereby improving the coating effect of the insulating film 2 on the periphery of the battery cell 4.

[0059] The cutting unit in this embodiment includes a driving part for driving the cutter to move and cut the insulating film 2. The driving part here adopts a cylinder. In specific implementation, the cutter is installed on a fixed seat, and the power output end of the cylinder is connected to the fixed seat, and the cutter is driven by the fixed seat to cut the insulating film 2. The cutting here is performed before the second roller body moves up and down, that is, only after the insulating film 2 is cut, the second roller body will cover the two ends of the insulating film 2 on the side of the battery cell 4 with the explosion-proof valve 401.

[0060] The battery cell wrapping device of the present embodiment arranges the side of the battery cell 4 opposite to the explosion-proof valve 401 to be first bonded with the insulating film 2, and then the insulating film 2 is wrapped around the upper and lower surfaces of the battery cell 4 by a first rolling unit. After the cutter cuts the insulating film 2, the second lower roller body 6 and the second upper roller body 5 successively wrap the leading end and the tail end of the insulating film 2 around the side of the battery cell 4 with the explosion-proof valve 401, and at the same time, the explosion-proof valve 401 is exposed through a through hole defined by two corresponding notches 201, which is beneficial to improving the wrapping effect and efficiency of the insulating film 2.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cutter for cutting an insulating film used to coat the outer periphery of a battery cell, characterized in that: The cutter comprises a cutter body extending along the width direction of the insulating film, the cutter body is provided with a cutting hole portion corresponding to the explosion-proof valve on one side of the battery cell, and the interior of the cutting hole portion is hollow; The cutter body and the hole cutting part can cut the insulating film, and the hole cutting part can cut notches at both ends of the insulating film respectively, and the notches at both ends of the insulating film can be connected to form a through hole for exposing the explosion-proof valve.

2. The cutter according to claim 1, characterized in that: The cut-out portion is arranged in accordance with the shape of the explosion-proof valve, and the width of the cut-out portion is greater than the width of the explosion-proof valve.

3. The cutter according to claim 1, characterized in that: The cutting hole portion is symmetrically arranged on the cutter body with the plane where the cutter body is located as a symmetry plane.

4. The cutter according to any one of claims 1 to 3, characterized in that: The explosion-proof valves are two arranged at intervals on the side of the battery cell; The cutting hole parts are two and are arranged on the cutter body in a one-to-one correspondence with the explosion-proof valves.

5. A cell coating device, used to coat an insulating film on the periphery of a cell, characterized in that: The battery cell coating device comprises a first rolling unit, a second rolling unit, and a cutting unit, and the cutting unit has a cutter according to any one of claims 1 to 4; The middle portion of the insulating film is attached to a side of the battery cell opposite to the explosion-proof valve, the first rolling unit is used to cover the insulating film on the upper and lower surfaces of the battery cell, the cutter is used to cut the insulating film, and the second rolling unit is used to cover both ends of the insulating film on a side of the battery cell having the explosion-proof valve, and expose the explosion-proof valve to the through hole.

6. The battery core coating device according to claim 5, characterized in that: The first rolling unit includes a plurality of first rollers rotatably arranged on upper and lower sides of the battery core; As the battery core is transported between the first rollers, the insulating film covers the upper and lower surfaces of the battery core.

7. The battery cell coating device according to claim 5, characterized in that: The second rolling unit includes two second rollers that are rotatably arranged, and each of the second rollers is arranged corresponding to the leading end and the trailing end of the insulating film at the target position; Each of the second rollers can be driven to move upward or downward, and the leading end or the trailing end of the insulating film can be successively covered on the side of the battery cell having the explosion-proof valve.

8. The battery core coating device according to claim 5, characterized in that: The insulating film covering the outer periphery of the battery core is at least partially overlapped at both ends.

9. The battery core coating device according to any one of claims 5 to 8, characterized in that: The cutting unit includes a driving portion for driving the cutter to move and cut the insulating film.

10. The battery core coating device according to claim 9, characterized in that: The driving part adopts a cylinder.

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