A film collecting mechanism for the side of a battery cell

Abstract

The present invention relates to the field of battery production, and discloses a cell side film collecting mechanism, which is used to fold the first extension part of the insulating film to the first side of the cell. The film collecting mechanism includes a folding structure and a first driving device; wherein the first driving device is used to drive the folding structure to move to the side of the first extension part away from the cell; it is also used to drive the folding structure to move a first distance along a first direction; it is also used to drive the folding structure to move along a second direction, so that the folding structure presses the end of the first extension part close to the first large surface to the first side surface; it is also used to drive the folding structure to move in the first direction close to the first side surface, so that the folding structure presses the end of the first extension part away from the first large surface to the first side surface. The cell side film collecting mechanism can press the entire first extension part to the first side surface, so that the entire first extension part is firmly attached to the first side surface, thereby reducing the risk of warping of the first extension part.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a side film collecting mechanism for a battery cell. Background Art

[0002] In the production process of lithium batteries, an insulating film needs to be attached to the large surface of the battery cell. The insulating film has an extension portion, which extends from the edge of the large surface. During the film attachment process, the extension portion needs to be folded and attached to the side of the battery cell. However, the extension portion is easily not attached firmly, resulting in warping of the extension portion. Summary of the invention

[0003] The invention provides a cell side film collecting mechanism, which is used to solve the problem in the prior art that an extension portion is easily warped after being attached to the side of the cell.

[0004] In a first aspect, the present invention provides a cell side film collecting mechanism, which is used to fold an insulating film covering a large surface of a cell and attach it to a side surface of the cell; the cell has a first large surface and a first side surface, the first large surface is covered with a first insulating film; the first insulating film has a first extension portion, the first extension portion and the first side surface are arranged on the same side, and the orthographic projection of the first extension portion on the plane where the first large surface is located is located outside the orthographic projection of the first side surface on the plane where the first large surface is located;

[0005] The battery cell side film collecting mechanism includes a frame, a folding structure and a first driving device, and the folding structure and the first driving device are arranged on the frame; the first driving device is connected to the folding structure, and the first driving device is used to drive the folding structure to move to the side of the first extension part away from the battery cell; it is also used to drive the folding structure to move a first distance in a first direction, and the first direction is perpendicular to the first large surface; it is also used to drive the folding structure to move in a second direction, so that the folding structure presses the end of the first extension part close to the first large surface to the first side surface, and the second direction is perpendicular to the first side surface; it is also used to drive the folding structure to move in the first direction close to the first side surface, so that the folding structure presses the end of the first extension part away from the first large surface to the first side surface.

[0006] The beneficial effects of the cell side film collection mechanism provided by the present invention are as follows:

[0007] In the process of folding and pasting the first extension part to the first side surface of the battery cell by the above-mentioned battery cell side edge film collecting mechanism, the movement trajectory of the folding structure is a fold line. Driven by the first driving device, the folding structure first moves a first distance along the first direction, and in this process, the first extension part will bend toward the first side surface. Then, the folding structure moves along the second direction, and after the folding structure moves a certain distance along the second direction, the folding structure can press the end of the first extension part close to the first large surface to the first side surface. At this time, the end of the first extension part close to the first large surface is subjected to the pressure applied by the folding structure, and is tightly pasted to the first side surface under the action of the pressure. Then, the folding structure continues to move along the first direction to press the entire first extension part to the first side surface, so that the entire first extension part is firmly pasted to the first side surface, thereby reducing the risk of warping of the first extension part. In addition, the folding structure can discharge bubbles between the first extension part and the first side surface during the movement process, and is conducive to evenly distributing the viscous material between the first extension part and the first side surface, so that the first extension part is relatively flat.

[0008] In a second aspect, the present invention further provides a battery production device, which includes the above-mentioned battery cell side film collecting mechanism. When folding the first extension part, the above-mentioned battery cell side film collecting mechanism can press the entire first extension part to the first side surface, so that the entire first extension part is firmly attached to the first side surface, thereby reducing the risk of warping of the first extension part. In addition, the folding structure can discharge bubbles between the first extension part and the first side surface during movement, and is conducive to evenly distributing the viscous material between the first extension part and the first side surface, so that the first extension part is relatively flat. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of a structure of a cell side film collecting mechanism provided in an embodiment of the present application;

[0010] Figure 2 A schematic diagram of an orthographic projection of a battery cell, a tray and a first insulating film along a first direction X provided in an embodiment of the present application;

[0011] Figure 3 A structural schematic diagram of a folding structure provided in an embodiment of the present application;

[0012] Figure 4 Another structural schematic diagram of the folding structure provided in an embodiment of the present application;

[0013] Figure 5 Another structural schematic diagram of the folding structure provided in an embodiment of the present application;

[0014] Figure 6A diagram showing an effect of squeezing the insulating film folded to the first side surface by the compaction structure provided in an embodiment of the present application;

[0015] Figure 7 Another structural schematic diagram of the cell side film collecting mechanism provided in an embodiment of the present application;

[0016] Figure 8 Another structural schematic diagram of the cell side film collecting mechanism provided in an embodiment of the present application;

[0017] Fig. 9 Another structural schematic diagram of the cell side film collecting mechanism provided in an embodiment of the present application;

[0018] Fig.10 Another structural schematic diagram of the battery cell side film collecting mechanism provided in an embodiment of the present application.

[0019] Reference numerals:

[0020] 10-frame; 20-folding structure;

[0021] 201-first end; 202-second end;

[0022] 203-first surface; 204-second surface;

[0023] 205-first end surface; 30-first driving device;

[0024] 31-first linear motor module; 32-second linear motor module;

[0025] 40-compacted structure; 401-second end surface;

[0026] 50-battery core pressing plate; 60-second driving device;

[0027] 70-battery cell; 701-first large surface;

[0028] 702-first side surface; 703-second largest surface;

[0029] 80-first insulating film; 801-first extending portion;

[0030] 90-a second insulating film; 901-a second extending portion;

[0031] 100-Pallet; C-Reach space. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the example embodiments of the present application to clearly and completely describe the technical solutions in the example embodiments of the present application. The example embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Therefore, it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of protection of the present application.

[0033] In the description of the present application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0034] Unless otherwise specified or explained, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Further, in the description of the present application, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the exemplary embodiments of the present application. It should also be understood that in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0036] As an energy storage unit, lithium-ion batteries can realize the mutual conversion of chemical energy and electrical energy. Lithium-ion batteries are widely used in production and life. For example, in the field of new energy vehicles, a certain number of lithium-ion batteries can be combined to form a battery pack to provide power for new energy vehicles.

[0037] The production process of lithium-ion batteries (referred to as batteries) includes a variety of processes, such as the preparation of pole pieces, the synthesis of battery cells, and the testing and packaging, among which a variety of processing mechanisms are involved, such as coating mechanisms, rolling mechanisms, stacking mechanisms, hot pressing mechanisms, packaging mechanisms, and chemical composition mechanisms. Different processing mechanisms are used in different stages of the battery production process and have different functions. For example, the stacking mechanism can stack the positive pole pieces, negative pole pieces, and diaphragms to form a battery cell. For another example, the hot pressing mechanism can heat and pressurize the battery cell so that the positive pole pieces, negative pole pieces, and diaphragms are stacked tightly together.

[0038] The embodiment of the present application relates to a cell side film collecting mechanism and a battery production device including the cell side film collecting mechanism. The cell side film collecting mechanism is also used in the battery production process, and can fold the extension of the insulating film covering the large surface of the cell and attach it to the side of the cell, so that the insulating film covers the large surface and the side of the cell. The structure and principle of the cell side film collecting mechanism are now described in detail in conjunction with the accompanying drawings.

[0039] Figure 1 A schematic diagram of a structure of a cell side film collection mechanism provided in an embodiment of the present application, such as Figure 1 As shown, in one embodiment, the cell side film collecting mechanism includes a frame 10, a folding structure 20 and a first driving device 30. The folding structure 20 and the first driving device 30 are arranged on the frame 10. The first driving device 30 is connected to the folding structure 20, and the first driving device 30 is used to drive the folding structure 20 to move along a preset track, so that the folding structure 20 pushes the extension of the insulating film covering the large surface of the cell 70 to fold toward the side of the cell 70, and the extension is adhered to the side of the cell 70.

[0040] As for the battery cell 70, the battery cell 70 is a hexahedral structure, having two large faces, two side faces and two end faces. Among them, in terms of area, the large face has the largest area. In terms of the lead-out position of the tab, the tab is led out from the end face. In terms of the placement of the battery cell 70 during the film lamination process, the two large faces are located on opposite sides of the battery cell 70 along the first direction.

[0041] like Figure 1As shown, in one embodiment, the battery cell 70 has a first large surface 701 and a first side surface 702, the first large surface 701 is covered with a first insulating film 80, and the first insulating film 80 and the first large surface 701 are stacked along a first direction X. In the film pasting station, the first direction X can also be understood as a vertical direction. When the first insulating film 80 is specifically set, the size of the first insulating film 80 is larger than the size of the first large surface 701. After the first insulating film 80 is attached to the first large surface 701, the first insulating film 80 has a first extension portion 801, and the orthographic projection of the first extension portion 801 on the plane where the first large surface 701 is located is located outside the first large surface 701. It can also be understood that the first extension portion 801 extends from the edge of the first large surface 701. The first extension portion 801 and the first side surface 702 are located on the same side of the first large surface 701, and the battery cell side film collection mechanism is specifically used to fold the first extension portion 801 and attach it to the first side surface 702.

[0042] In a specific implementation, in one embodiment, first, the first driving device 30 can drive the folding structure 20 to move to the side of the first extension 801 away from the battery cell 70. At this time, the first extension 801 and the first side 702 are in a vertical or nearly vertical state, and the folding structure 20 and the first side 702 have a certain distance along the second direction Y. Among them, the second direction Y is perpendicular to the first side 702. Then, the first driving device 30 can drive the folding structure 20 to move a first distance along the first direction X. During the movement, the folding structure 20 gradually moves away from the plane where the first large surface 701 is located, and pushes the first extension 801 to fold toward the first side 702. After the folding structure 20 moves the first distance along the first direction X, the first driving device 30 can drive the folding structure 20 to move along the second direction Y until the folding structure 20 presses the end of the first extension 801 close to the first large surface 701 to the first side 702. At this time, the folding structure 20 applies pressure to the end of the first extension part 801 close to the first large surface 701, so that the end of the first extension part 801 close to the first large surface 701 is adhered to the first side surface 702. Finally, the first driving device 30 can drive the folding structure 20 to move along the first direction X close to the first side surface 702, and make the folding structure 20 continue to move away from the plane where the first large surface 701 is located. In this process, the folding structure 20 continuously presses the first extension part 801 to the first side surface 702, so that the first extension part 801 and the first side surface 702 are adhered. Until the folding structure 20 presses the end of the first extension part 801 away from the first large surface 701 to the first side surface 702, so that the end of the first extension part 801 away from the first large surface 701 is also adhered to the first side surface 702, the first driving device 30 stops driving the folding structure 20 to move along the above direction.

[0043] In the process of folding and pasting the first extension part 801 to the first side surface 702 of the battery cell 70 by the above-mentioned battery cell side edge film collecting mechanism, the movement trajectory of the folding structure 20 is a broken line. After the folding structure 20 moves a first distance along the first direction X, the orthographic projection of the folding structure 20 on the plane where the first side surface 702 is located and the first side surface 702 at least partially overlap. After the folding structure 20 moves a certain distance along the second direction Y, the folding structure 20 can press the end of the first extension part 801 close to the first large surface 701 to the first side surface 702. At this time, the end of the first extension part 801 close to the first large surface 701 is subjected to the pressure applied by the folding structure 20, and is tightly adhered to the first side surface 702 under the action of the pressure. Then, when the folding structure 20 continues to move along the first direction X and gradually moves away from the plane where the first large surface 701 is located, the folding structure 20 can press the entire first extension portion 801 to the first side surface 702, so that the entire first extension portion 801 is firmly attached to the first side surface 702, thereby reducing the risk of warping of the first extension portion 801. In addition, the folding structure 20 can discharge bubbles between the first extension portion 801 and the first side surface 702 during the movement process, and is conducive to evenly distributing the viscous material between the first extension portion 801 and the first side surface 702, so that the first extension portion 801 is relatively flat.

[0044] Please continue to refer to Figure 1 In one embodiment, a tray 100 is disposed at the bottom of the battery cell 70 , and the tray 100 is used to carry the battery cell 70 . Figure 2 A schematic diagram of an orthographic projection of a battery cell, a tray, and a first insulating film along a first direction X provided in an embodiment of the present application, as shown in FIG. Figure 2 As shown, in one embodiment, the orthographic projection of the battery cell 70 along the first direction X is located inside the orthographic projection of the tray 100 along the first direction X; and at least a portion of the orthographic projection of the first extension portion 801 along the first direction X is located outside the orthographic projection of the tray 100 along the first direction X. In other words, the battery cell 70 is completely located inside the tray 100, and at least a portion of the first extension portion 801 extends beyond the edge of the tray 100.

[0045] With respect to the tray 100, the first large surface 701 of the battery cell 70 may be the side of the battery cell 70 facing the tray 100, or the side of the battery cell 70 facing away from the tray 100. When the first large surface 701 is the side of the battery cell 70 facing the tray 100, the first insulating film 80 is located at the bottom of the battery cell 70 and is sandwiched between the battery cell 70 and the tray 100, and the battery cell side film collection mechanism can fold the first extension 801 of the first insulating film 80 upward and stick it to the first side surface 702. When the first large surface 701 is the side of the battery cell 70 facing away from the tray 100, the first insulating film 80 is located at the top of the battery cell 70 and away from the tray 100, and the battery cell side film collection mechanism can fold the first extension 801 of the first insulating film 80 downward and stick it to the first side surface 702.

[0046] In a specific embodiment, a plurality of positioning protrusions are provided on a side surface of the tray 100 facing the battery cell 70. A first insulating film 80 is provided between the battery cell 70 and the tray 100, and a first extension portion 801 of the first insulating film 80 covers at least part of the positioning protrusions, and the first extension portion 801 extends from the edge of the tray 100. During the film application process, the first driving device 30 can specifically drive the folding structure 20 to rise a first distance along the first direction X, so that the height of the folding structure 20 is increased, and at least part of the folding structure 20 is located above the tray 100 and higher than the positioning protrusions on the surface of the tray 100. Then, when the first driving device 30 drives the folding structure 20 to approach the first side surface 702 along the second direction Y, the folding structure 20 can avoid the positioning protrusions on the surface of the tray 100, so that it can abut against the first side surface 702.

[0047] When the first distance is specifically set, the size of the first distance is related to a variety of factors. For example, the height of the positioning protrusion along the first direction X, the shape of the folding structure 20, etc. In the case where the first distance enables the folding structure 20 to avoid the positioning protrusion on the surface of the tray 100, the value of the first distance should be minimized as much as possible, so that after the folding structure 20 moves along the second direction Y and presses the first extension part 801 to the first side surface 702, the contact position between the folding structure 20 and the first extension part 801 is close to the root of the first extension part 801, so that when the folding structure 20 continues to move upward along the first direction X, the entire first extension part 801 can basically be squeezed by the folding structure 20 and adhered to the first side surface 702, thereby improving the adhesion effect of the first extension part 801.

[0048] When the folding structure 20 is specifically provided, the folding structure 20 includes a variety of structural forms. For example, the folding structure 20 can be a sheet structure, a rectangular parallelepiped structure, a wedge structure or other structures. Figure 3 A structural schematic diagram of the folding structure provided in the embodiment of the present application is as follows: Figure 3As shown, in one embodiment, the hem structure 20 has a first end 201, a second end 202, a first surface 203, and a second surface 204. The first end 201 and the second end 202 are located at two opposite ends of the hem structure 20 along the second direction Y, and the first end 201 is close to the battery cell 70, and the second end 202 is far away from the battery cell 70. The first surface 203 and the second surface 204 are located at two opposite sides of the hem structure 20 along the first direction X, and the plane where the first surface 203 is located is perpendicular to the first direction X, and the second surface 204 is inclined relative to the first surface 203. In addition, from the first end 201 to the second end 202, the distance from the second surface 204 to the plane where the first surface 203 is located gradually increases.

[0049] The above-mentioned folding structure 20 is a wedge-shaped structure, wherein the second surface 204 is an inclined surface of the wedge-shaped structure. When the folding structure 20 is located on the side of the first extension portion 801 away from the battery cell 70, the second surface 204 faces the first extension portion 801. Then, in the process of the folding structure 20 moving the first distance along the first direction X, the second surface 204 can push the first extension portion 801 to fold toward the first side surface 702. In the process of the folding structure 20 approaching the first side surface 702 along the second direction Y, since the folding structure 20 is wedge-shaped and the cross-sectional area of ​​the folding structure 20 gradually decreases from the second end 202 to the first end 201, the folding structure 20 can be smoothly inserted into the bottom of the first extension portion 801. In this process, the first extension portion 801 can form a surface-to-surface contact with the second surface 204 and be supported by the second surface 204, thereby reducing the risk of wrinkles in the first extension portion 801.

[0050] Please continue to refer to Figure 3 In one embodiment, the first surface 203 is located at the bottom surface of the folding structure 20, and the second surface 204 is located at the top surface of the folding structure 20. The folding structure 20 can be used to fold the first extension portion 801 of the first insulating film 80 located at the bottom of the battery cell 70 upward, and make the first extension portion 801 adhere to the first side surface 702.

[0051] Figure 4 Another structural schematic diagram of the folding structure provided in the embodiment of the present application, and Figure 3 The folded edge structure 20 shown is different in that Figure 4 As shown, the first surface 203 of the folding structure 20 is located on the top surface of the folding structure 20, and the second surface 204 is located on the bottom surface of the folding structure 20. The folding structure 20 can be used to fold the first extension portion 801 of the first insulating film 80 located on the top of the battery cell 70 downward and adhere it to the first side surface 702.

[0052] For reference Figure 3 and Figure 4In some embodiments, the folding structure 20 has a first end face 205 at one end close to the battery cell 70 along the second direction Y, and the first end face 205 is a plane, and the plane where the first end face 205 is located is perpendicular to the second direction Y. After the folding structure 20 moves along the second direction Y and presses the end of the first extension portion 801 close to the first large surface 701 to the first side surface 702, the first end face 205 contacts the first extension portion 801 and can apply pressure to the first extension portion 801. At this time, the folding structure 20 and the first extension portion 801 form a surface-to-surface contact, rather than a line-to-surface contact. In other words, the folding structure 20 and the first extension portion 801 have a larger contact area. Then, when the folding structure 20 moves along the first direction X close to the first side surface 702, the folding structure 20 is not likely to scratch the first extension portion 801.

[0053] When specifically setting the size of the first end face 205, in one embodiment, the size of the first end face 205 along the first direction X is smaller than the size of the battery cell 70 along the first direction X. When the folding structure 20 moves along the second direction Y and presses the first extension 801 against the first side surface 702, the first end face 205 can contact a portion of the first extension 801, and under the extrusion, the viscous material between the first extension 801 and the first side surface 702 can overflow to the surroundings. Then, during the movement of the folding structure 20 along the first direction X, the first end face 205 can scrape the viscous material between the first extension 801 and the first side surface 702, so that the first extension 801 is relatively flat.

[0054] In one embodiment, the length of the first end surface 205 along the third direction Z is greater than or equal to the length of the battery cell 70 along the third direction Z, wherein the third direction Z is perpendicular to the first direction X, and the third direction Z is perpendicular to the second direction Y. The first end surface 205 can press the first extension portion 801 against the entire area of ​​the first side surface 702, further reducing the risk of warping of the first extension portion 801.

[0055] Figure 5 Another structural schematic diagram of the folding structure provided in the embodiment of the present application is as follows: Figure 5 As shown, in one embodiment, a compaction structure 40 is provided at the bottom of the folding structure 20, and a side surface of the compaction structure 40 facing the battery cell 70 and the bottom surface of the folding structure 20 form an escape space C. After the first extension portion 801 is attached to the first side surface 702, the first driving device 30 is also used to drive the folding structure 20 to move along the second direction Y, so that the compaction structure 40 presses against the first side surface 702. At this time, the escape space C is used to avoid the battery cell 70. The compaction structure 40 can apply pressure to the first side surface 702, so that the insulating film folded to the first side surface 702 and the first side surface 702 are attached more closely.

[0056] When the compaction structure 40 is specifically set, the compaction structure 40 has a second end face 401 on the side facing the battery cell 70, the second end face 401 is a plane, the plane where the second end face 401 is located is perpendicular to the second direction Y, and the second end face 401 is used to abut against the first side face 702, so that the first side face 702 is subjected to uniform force. Optionally, the compaction structure 40 is a rectangular parallelepiped structure.

[0057] Please continue to refer to Figure 5 In one embodiment, the bottom surface of the folded edge structure 20 is a plane, and the bottom surface and the second end surface 401 intersect vertically to form an avoidance space C, which can accommodate the end corners of the battery cell 70, wherein the bottom surface of the folded edge structure 20 can be pressed against the top of the battery cell 70, and the second end surface of the compaction structure 40 can be pressed against the side of the battery cell 70, thereby positioning the battery cell 70 and reducing the risk of dislocation of the electrode in the battery cell 70 under the pressure of the compaction structure 40.

[0058] Figure 6 A diagram showing an effect of squeezing the insulating film folded to the first side surface by the compaction structure provided in an embodiment of the present application, such as Figure 6 As shown, in one embodiment, the top and bottom of the battery cell 70 are respectively provided with a first insulating film 80, and each first insulating film 80 has a first extension portion 801. Driven by the first driving device 30, the folding structure 20 can fold the first extension portion 801 of the first insulating film 80 located at the bottom of the battery cell 70 upward, and paste the first extension portion 801 to the first side 702. Then, driven by the first driving device 30, the folding structure 20 can also fold the first extension portion 801 of the first insulating film 80 located at the top of the battery cell 70 downward, and paste the first extension portion 801 to the first side 702. Finally, driven by the first driving device 30, the compaction structure 40 can apply pressure to the above-mentioned two first extension portions 801, so that the two first extension portions 801 are tightly bonded to the first side 702.

[0059] Figure 7 Another structural schematic diagram of the cell side film collection mechanism provided in the embodiment of the present application is as follows: Figure 7 As shown, in one embodiment, in addition to the first large surface 701, the battery cell 70 also has a second large surface 703, the second large surface 703 and the first large surface 701 are arranged opposite to each other, and the second large surface 703 is covered with a second insulating film 90. The second insulating film 90 has a second extension portion 901, and the orthographic projection of the second extension portion 901 on the plane where the second large surface 703 is located is located outside the second large surface 703. It can also be understood that the second extension portion 901 extends from the edge of the second large surface 703. The second extension portion 901 and the first side surface 702 are located on the same side of the second large surface 703, and the battery cell side film collection mechanism in the present application can also fold the second extension portion 901 and stick it to the first side surface 702.

[0060] In specific implementation, the first driving device 30 is also used to drive the folding structure 20 to move to the side of the second extension 901 away from the battery cell 70, and to make the folding structure 20 close to the first side surface 702 along the second direction Y; it is also used to drive the folding structure 20 to move close to the first side surface 702 along the first direction X, so that the folding structure 20 presses the end of the second extension 901 away from the second large surface 703 to the first side surface 702. In the process of folding the second extension 901, the movement trajectory of the folding structure 20 is a straight line.

[0061] Please continue to refer to Figure 7 In one embodiment, a first insulating film 80 is disposed at the bottom of the battery cell 70, and a second insulating film 90 is disposed at the top of the battery cell 70. The first driving device 30 can drive the folding structure 20 to move along two different paths, and respectively fold the first extension 801 of the first insulating film 80 to the first side surface 702 of the battery cell 70, and fold the second extension 901 of the second insulating film 90 to the first side surface 702 of the battery cell 70, and the first extension 801 and the second extension 901 are stacked on the first side surface 702. In addition, in order to further improve the folding effect of the first extension 801 and the second extension 901, the two can also be squeezed by the compaction structure 40 so that the two are closely attached to the first side surface.

[0062] Figure 8 Another structural schematic diagram of the cell side film collection mechanism provided in the embodiment of the present application is as follows: Figure 8 As shown, in one embodiment, the battery cell side film collecting mechanism further includes a battery cell pressing plate 50, and the battery cell pressing plate 50 is used to press against the surface of the battery cell 70, so as to fix the battery cell 70 during the film pasting process to improve the film pasting effect.

[0063] When implementing it specifically, Figure 8 As shown, in one embodiment, a second driving device 60 is further provided on the frame 10, and the second driving device 60 is used to drive the battery cell pressing plate 50 to move along the first direction X, so that the battery cell pressing plate 50 is away from the battery cell 70 or close to the battery cell 70. In the battery production process, when the battery cell 70 flows to the film laminating station, the second driving device 60 can drive the battery cell pressing plate 50 to move downward, so that the battery cell pressing plate 50 presses against the surface of the battery cell 70, thereby fixing the battery cell 70 on the tray 100.

[0064] In addition to providing a second driving device 60 to drive the cell pressing plate 50 to move along the first direction X so that the cell pressing plate 50 is pressed against the surface of the cell 70, other implementation methods are also included. For example, in one embodiment, the battery production equipment also includes a transfer mechanism and a track, the track extends along the third direction Z, and the transfer mechanism can drive the tray 100 to slide along the track, and can drive the tray 100 to move up and down along the first direction X. The transfer mechanism can transfer the tray to a position corresponding to the cell side film collection mechanism, and then drive the tray to rise until the cell 70 is abutted against the bottom of the cell pressing plate 50.

[0065] When the battery cell pressing plate 50 is specifically set, Figure 8 As shown, in one embodiment, the size of the battery cell pressing plate 50 along the second direction Y is less than or equal to the size of the battery cell 70 along the second direction Y, and the edge of the battery cell pressing plate 50 will not extend from the opposite sides of the battery cell 70 along the second direction Y. A second insulating film 90 is arranged between the battery cell pressing plate 50 and the battery cell 70. When the first driving device 30 drives the folding structure 20 to fold the second insulating film 90, the movement trajectory of the folding structure 20 is a straight line. That is, the first driving device 30 can drive the folding structure 20 to move to a position close to the first side surface 702. At this time, the folding structure 20 will not interfere with the battery cell pressing plate 50. Then, the first driving device 30 can drive the folding structure 20 to move downward, so that the second extension portion 901 is folded and adhered to the first side surface 702.

[0066] Fig. 9 Another structural schematic diagram of the cell side film collection mechanism provided in the embodiment of the present application is as follows: Fig. 9 As shown, in one embodiment, the size of the cell pressing plate 50 along the second direction Y is greater than the size of the cell 70 along the second direction Y, and a portion of the cell pressing plate 50 extends from two opposite sides of the cell 70 along the second direction Y. A first insulating film 80 is provided between the cell pressing plate 50 and the cell 70. In the process of the first driving device 30 driving the folding structure 20 to fold the first extension 801 of the first insulating film 80, the movement trajectory of the folding structure 20 is a fold line. That is, the first driving device 30 can drive the folding structure 20 to move a first distance along the first direction X, so that at least part of the folding structure 20 is located below the cell pressing plate 50; then, the first driving device 30 drives the folding structure 20 to move along the second direction Y until the folding structure 20 presses the end of the first extension 801 close to the first side surface 702 against the first side surface 702; finally, the first driving device 30 drives the folding structure 20 to continue to move downward along the first direction X, so that the first extension 801 is attached to the first side surface 702.

[0067] Fig.10 Another structural schematic diagram of the cell side film collection mechanism provided in the embodiment of the present application is as follows: Fig.10 As shown, in one embodiment, the cell side film collecting mechanism includes two folding structures 20 and two first driving devices 30. When the two folding structures 20 and the two first driving devices 30 are specifically arranged, the two folding structures 20 are respectively located on the two opposite sides of the cell 70 along the second direction Y; the two first driving devices 30 are also respectively located on the two opposite sides of the cell 70 along the second direction Y. Driven by the two first driving devices 30, the two folding structures 20 can simultaneously fold the insulating film extending outside the cell 70 and stick it to the corresponding side of the cell 70, thereby improving efficiency.

[0068] When the first driving device 30 is specifically set, Fig.10 As shown, in one embodiment, the first driving device 30 includes a first linear motor module 31 and a second linear motor module 32. The first linear motor module 31 can drive the folding structure 20 to move along the first direction X, and the second linear motor module 32 can drive the folding structure 20 to move along the second direction Y.

[0069] When the first driving device 30 and the folding structure 20 are specifically connected, in one embodiment, the folding structure 20 is connected to the first linear motor module 31 , and the first linear motor module 31 is connected to the second linear motor module 32 via a slide.

[0070] Based on the same technical concept, an embodiment of the present application also provides a battery production device, which includes the battery cell side film collecting mechanism described in the above embodiment. When folding the first extension part, the above battery cell side film collecting mechanism can press the entire first extension part to the first side surface of the battery cell, so that the entire first extension part is firmly attached to the first side surface, thereby reducing the risk of warping of the first extension part. In addition, the folding structure can discharge bubbles between the first extension part and the first side surface during movement, and is conducive to evenly distributing the viscous material between the first extension part and the first side surface, so that the first extension part is relatively flat.

[0071] When the battery production equipment is specifically set up, in addition to the cell side film collecting mechanism, the battery production equipment may also include other processing mechanisms, such as a coating mechanism, a lamination mechanism, a hot pressing mechanism, a chemical composition mechanism, and the like.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A cell side film collecting mechanism, characterized in that: Used to fold the insulating film covering the large surface of the battery cell and attach it to the side surface of the battery cell; the battery cell has a first large surface and a first side surface, the first large surface is covered with a first insulating film; the first insulating film has a first extension portion, the orthographic projection of the first extension portion on the plane where the first large surface is located is located outside the first large surface, and the first extension portion and the first side surface are located on the same side of the first large surface; The battery cell side film collecting mechanism includes a frame, a folding structure and a first driving device, the folding structure and the first driving device are arranged on the frame; the first driving device is connected to the folding structure, and the first driving device is used to drive the folding structure to move to the side of the first extension part away from the battery cell; it is also used to drive the folding structure to move a first distance in a first direction, so that the orthographic projection of the folding structure on the plane where the first side surface is located and the first side surface at least partially overlap, and the first direction is perpendicular to the first large surface; it is also used to drive the folding structure to move in a second direction, so that the folding structure presses the end of the first extension part close to the first large surface to the first side surface, and the second direction is perpendicular to the first side surface; it is also used to drive the folding structure to move in the first direction close to the first side surface, so that the folding structure presses the end of the first extension part away from the first large surface to the first side surface; The hem structure has a first end, a second end, a first surface and a second surface; The first end and the second end are located at two opposite ends of the folded edge structure along the second direction, and the first end is close to the battery core, and the second end is far from the battery core; The first surface and the second surface are located on two opposite sides of the folded edge structure along the first direction, the plane where the first surface is located is perpendicular to the first direction, the second surface is inclined relative to the first surface, and when the folded edge structure is located on a side of the first extension portion away from the battery core, the second surface faces the first extension portion; From the first end to the second end, the distance between the second surface and the plane where the first surface is located gradually increases; When the folded edge structure approaches the first side surface along the second direction, the second surface is used to support the first extension portion and is in contact with a side of the first extension portion facing away from the battery core.

2. The cell side film collecting mechanism according to claim 1, characterized in that: The folded edge structure has a first end surface at one end close to the battery core along the second direction. The first end surface is a plane, and the plane where the first end surface is located is perpendicular to the second direction.

3. The cell side film collecting mechanism according to claim 2, characterized in that: A size of the first end surface along the first direction is smaller than a size of the battery cell along the first direction.

4. The cell side film collecting mechanism according to claim 2, characterized in that: The dimension of the first end surface along the third direction is greater than or equal to the dimension of the battery cell along the third direction; The third direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction.

5. The cell side film collecting mechanism according to any one of claims 1 to 4, characterized in that: A compaction structure is provided at the bottom of the folding structure, and a side surface of the compaction structure facing the battery core and a bottom surface of the folding structure form an escape space; After the first extension portion is adhered to the first side surface, the first driving device is further used to drive the folding structure to move along the second direction so that the compaction structure is pressed against the surface of the first extension portion, and the avoidance space is used to avoid the battery cell.

6. The cell side film collecting mechanism according to any one of claims 1 to 4, characterized in that: The battery cell also has a second large surface, the second large surface is arranged opposite to the first large surface, and the second large surface is covered with a second insulating film; the second insulating film has a second extension portion, the orthographic projection of the second extension portion on the plane where the second large surface is located is located outside the second large surface, and the second extension portion and the first side surface are located on the same side of the second large surface; The first driving device is also used to drive the folding structure to move to the side of the second extension portion away from the battery cell, and to make the folding structure close to the first side surface along the second direction; it is also used to drive the folding structure to move close to the first side surface along the first direction, so that the folding structure presses the end of the second extension portion away from the second large surface to the first side surface.

7. The cell side film collecting mechanism according to any one of claims 1 to 4, characterized in that: It also includes a battery cell pressure plate and a second driving device, which are arranged on the frame; the second driving device is connected to the battery cell pressure plate, and the second driving device is used to drive the battery cell pressure plate to move along the first direction so that the battery cell pressure plate is pressed against the surface of the battery cell.

8. The cell side film collecting mechanism according to any one of claims 1 to 4, characterized in that: The battery cell side edge film collecting mechanism includes two folding structures and two first driving devices, and the two folding structures are respectively located on two opposite sides of the battery cell along the second direction.

9. A battery production device, characterized in that: It comprises a cell side film collecting mechanism as described in any one of claims 1 to 8.

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