Battery monomer manufacturing method and battery processing equipment

Abstract

The present application discloses a manufacturing method of a battery cell and a battery processing device. The manufacturing method of a battery cell includes: providing a packaging film; providing an electrode unit, and placing the electrode unit on the packaging film; folding the packaging film so that the packaging film forms two packaging layers, wherein at least part of the electrode unit is located between the two packaging layers, and the periphery of the packaging layer has a first region, a second region, a third region and a fourth region arranged in sequence, and the first region corresponds to the folding part of the packaging film; hot pressing the second region of the two packaging layers; hot pressing the third region of the two packaging layers; cutting off the folding edge of the packaging film; after cutting off the folding edge, hot pressing the first region of the two packaging layers; after cutting off the folding edge, hot pressing the fourth region of the two packaging layers; when hot pressing is completed in part of the first region, the second region, the third region and the fourth region, the inner cavity between the two packaging layers is evacuated. The manufacturing method in the present application can improve product reliability.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method for manufacturing a battery cell and battery processing equipment. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] The development of battery technology must take into account multiple design factors at the same time. For example, how to improve the reliability of battery manufacturing methods and product yield is an important research direction in the battery field. Summary of the invention

[0004] The present application provides a method for manufacturing a battery cell and a battery processing device, which can improve reliability and product yield.

[0005] In a first aspect, an embodiment of the present application provides a method for manufacturing a battery cell, comprising: providing a packaging film; providing an electrode unit, and placing the electrode unit on the packaging film; folding the packaging film so that the packaging film forms two packaging layers, wherein at least a portion of the electrode unit is located between the two packaging layers, and the periphery of the packaging layer has a first region, a second region, a third region and a fourth region arranged in sequence, and the first region corresponds to the folding portion of the packaging film; hot pressing the second region of the two packaging layers; hot pressing the third region of the two packaging layers; cutting off the folded edge of the packaging film; after cutting off the folded edge, hot pressing the first region of the two packaging layers; after cutting off the folded edge, hot pressing the fourth region of the two packaging layers; when hot pressing is completed on part of the first region, the second region, the third region and the fourth region, evacuating the inner cavity between the two packaging layers.

[0006] In the technical solution of the embodiment of the present application, the packaging film is first folded to at least partially cover the electrode unit, and the folded edges are cut off before all the edges are packaged. This can reduce or remove the bending stress formed by folding in the packaging film, thereby making it easier to keep the packaging film flat, reducing the possibility of wrinkles in the packaging film during the packaging process, and thus reducing the possibility of leakage in the manufactured battery cell during operation.

[0007] According to some embodiments of the present application, the step of providing a packaging film includes: providing a film material; punching out at least one recess on the film material; and cutting the film material to form a packaging film having a recess. The position for placing the electrode unit is processed on the film material to improve the alignment accuracy and make the packaging film and the electrode unit fit more closely.

[0008] According to some embodiments of the present application, the step of providing the packaging film further includes: pre-cutting the film material to form a pre-cutting track; and the step of cutting the film material further includes: cutting the film material along the pre-cutting track. Cutting can make the film material easier to break and make the cutting edge smooth.

[0009] According to some embodiments of the present application, the step of providing an electrode unit further includes: providing an electrode assembly and an electrode lead, and connecting the electrode assembly to the electrode lead to prepare an electrode unit; the step of folding the packaging film includes: staggering the electrode lead with the first region so that the electrode lead at least partially protrudes from the packaging layer and is exposed to the outside. The lead-out terminal in the electrode unit is arranged at the edge of the non-folded side and protrudes to facilitate electrical connection and avoid interference with the folding of the packaging film.

[0010] According to some embodiments of the present application, the step of staggering the electrode lead with the first region includes: at least partially positioning the electrode lead between the second regions of the two packaging films; and between the step of folding the packaging film and the step of cutting off the folded edge of the packaging film, further includes: hot pressing the second regions of the two packaging layers. The side where the electrode lead is located is first packaged before cutting off the folded edge to reduce the possibility of relative misalignment between the packaging film and the electrode lead.

[0011] According to some embodiments of the present application, between the step of hot pressing the second region of the two packaging layers and the step of cutting off the folded edge of the packaging film, the step includes: hot pressing the third region of the two packaging layers. The third region is packaged before the folded edge is cut off, so that the relative position of the packaging film and the electrode unit is further fixed, thereby reducing the possibility of misalignment of the packaging film.

[0012] According to some embodiments of the present application, the step of staggering the electrode lead and the first region includes: at least partially positioning the electrode lead between the third regions of the two packaging films; between the step of folding the packaging film and the step of cutting off the folded edge of the packaging film, hot pressing the third regions of the two packaging layers. The electrode lead is positioned on the other side opposite to the folded edge, and the third region is hot pressed before cutting the folded edge to fix the relative position of the electrode lead and the packaging film.

[0013] According to some embodiments of the present application, between the step of providing the packaging film and the step of providing the electrode unit, the step further includes: cutting at least one side edge of the packaging film to obtain an edge line of a preset shape; the step of providing the electrode unit further includes: arranging the electrode lead on the side where the cut edge is located. Before placing the electrode unit on the packaging film, the packaging film on the side where the electrode lead is located is trimmed to reduce the possibility of trimming after packaging on this side and causing interference with the electrode lead.

[0014] According to some embodiments of the present application, when hot pressing is completed on a portion of the first region, the second region, the third region, and the fourth region, the step of evacuating the inner cavity between the two packaging layers includes: hot pressing three of the first region, the second region, the third region, and the fourth region of the packaging layer, and evacuating the inner cavity between the two packaging layers from the other region; hot pressing a vacuumed area on one side, and connecting the packaging areas in the first region, the second region, the third region, and the fourth region end to end. After completing the packaging of the remaining edges, evacuate and package the last side edge to improve the sealing of the inner cavity, thereby improving the stability of the solid-state battery operation.

[0015] In a second aspect, an embodiment of the present application provides a battery processing device, including a stamping component, a folding component, a packaging component, a first cutting component, and a negative pressure component, wherein the stamping component is used to form a recess on the packaging film; the folding component is used to fold and press the packaging film to form two stacked packaging layers; the packaging component is used to hot-press the packaging layer to form a packaging structure; the first cutting component is used to cut off the folded edge of the packaging film; the negative pressure component is used to draw negative pressure between the packaging layers and package the packaging film. A first cutting mechanism for cutting the folded edge of the packaging film is provided in the battery processing device to reduce the possibility of wrinkles on the packaging film during the negative pressure drawing process.

[0016] According to some embodiments of the present application, the battery processing equipment further includes a second cutting assembly, which is used to cut at least one side edge of the packaging film to obtain an edge line of a preset shape. The battery processing equipment may also be provided with a second cutting assembly, which is used to trim the edge of the packaging film upstream to improve processing efficiency.

[0017] According to some embodiments of the present application, the battery processing equipment further includes a conveying assembly, which is used to transport the packaging film and the electrode assembly, one end of the conveying assembly is connected between the stamping assembly and the folding assembly, and the other end of the conveying assembly is connected to the first cutting assembly; the first cutting assembly is also used to cut at least one side edge of the packaging film to obtain an edge line of a preset shape. The battery processing equipment can also reuse the first cutting assembly as a mechanism for trimming the edge of the packaging film to save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0019] Figure 1 A flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application;

[0020] Figure 2 for Figure 1 The structural schematic diagram corresponding to step S2 is shown;

[0021] Figure 3 for Figure 1 The structural schematic diagram corresponding to step S3 is shown;

[0022] Figure 4 A partial flow chart of a method for manufacturing a battery cell provided in some embodiments of the present application;

[0023] Figure 5 for Figure 4 The structural schematic diagram corresponding to step S12 is shown;

[0024] Figure 6 A flowchart of a method for manufacturing a battery cell provided in some other embodiments of the present application;

[0025] Figure 7 A schematic diagram of the structure of a battery processing device provided for some embodiments of the present application;

[0026] Figure 8 A schematic diagram of the structure of a folding assembly provided in some embodiments of the present application;

[0027] Fig. 9 A schematic diagram of the structure of a negative pressure assembly provided in some embodiments of the present application.

[0028] Reference numerals:

[0029] 100-Battery processing equipment;

[0030] 101-stamping assembly; 102-folding assembly; 103-packaging assembly; 104-first cutting assembly; 105-negative pressure assembly;

[0031] 10-encapsulation film; 20-electrode unit; 30-encapsulation layer;

[0032] 11-film material; 12-recess; 13-pre-cut track; 21-electrode assembly; 22-electrode lead; 31-first area; 32-second area; 33-third area; 34-fourth area. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0039] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] In the existing battery processing process, there is usually a process step of wrapping the electrode assembly in a packaging film and then hot pressing the packaging film to form a packaging structure. In this step, a battery packaging device is usually required to heat and pressurize the packaging film from both sides through two pressing heads. Optionally, when packaging the last side edge of the packaging film, the cavity inside the packaging film can also be evacuated first to form a preset environment inside the packaging film after packaging.

[0042] However, the packaging film in the encapsulated substrate is usually made of materials such as aluminum plastic film, which has a certain hardness. Before encapsulation, the packaging film usually needs to be bent to cover the two side surfaces of the electrode unit. As a result, a bulge usually appears on the bent side of the packaging film and generates bending stress. When encapsulating the last side edge, the bending stress may cause the upper and lower layers of the packaging film to be misaligned and wrinkles may occur, which may lead to a decrease in the packaging effect and reliability, and there is a risk of leakage.

[0043] In view of this, an embodiment of the present application provides a technical solution, in which the bending stress is reduced or removed by cutting off the folded edge of the packaging film, so that the packaging films on the opposite sides of the electrode unit can be aligned with each other, thereby reducing the possibility of wrinkles at the edge of the last side of the package, thereby improving processing reliability and product yield.

[0044] The battery packaging device described in the embodiments of the present application is not limited to the batteries described above, but can also be used in other occasions where thin, foldable and easily wrinkled materials need to be packaged and protected. However, for the sake of simplicity, the following embodiments are all described using the packaging of batteries as an example.

[0045] Next, combine with Figure 1 To Attachment Fig. 9 The manufacturing method of the battery cell and the battery processing equipment are described in detail.

[0046] Please also read Figures 1 to 3 , Figure 1 A flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application, Figure 2 for Figure 1 The structural schematic diagram corresponding to step S2 is shown, Figure 3 for Figure 1 The structural schematic diagram corresponding to step S3 is shown.

[0047] In a first aspect, an embodiment of the present application provides a method for manufacturing a battery cell, comprising:

[0048] S1, providing a packaging film 10;

[0049] S2, providing an electrode unit 20, and placing the electrode unit 20 on the packaging film 10;

[0050] S3, folding the packaging film 10 so that the packaging film 10 forms two packaging layers 30, wherein at least part of the electrode unit 20 is located between the two packaging layers 30, and the periphery of the packaging layer 30 has a first area 31, a second area 32, a third area 33 and a fourth area 34 arranged in sequence, and the first area 31 corresponds to the folding position of the packaging film 10;

[0051] S4a, hot pressing the second regions 32 of the two packaging layers 30;

[0052] S4b, hot pressing the third region 33 of the two packaging layers 30;

[0053] S4c, cutting off the folded edge of the packaging film 10;

[0054] S5a, after cutting off the folded edge, hot pressing the first regions 31 of the two packaging layers 30;

[0055] S5b, after cutting off the folded edges, hot pressing the fourth regions 34 of the two packaging layers 30;

[0056] S6 , when the hot pressing of the first region 31 , the second region 32 , the third region 33 and a part of the fourth region 34 is completed, the inner cavity between the two packaging layers 30 is evacuated.

[0057] The present application provides a method for manufacturing a battery cell, which includes a step S1 of providing a packaging film 10, wherein the packaging film 10 may be a film material such as an aluminum-plastic film or a steel-plastic film that has good sealing properties and can be connected by heating and pressurizing. The packaging film 10 may be rectangular, and its area is larger than twice the surface area of ​​the electrode unit 20, so that it can cover the upper and lower surfaces of the electrode unit 20 and have a surplus that can be used for packaging.

[0058] It can be understood that the embodiment of the present application only illustrates the example that the electrode unit 20 is rectangular and the structure required after packaging is also rectangular, but the present application is not limited to this. The packaging layer 30 and the electrode unit 20 can have any suitable number of edges, and these edges can be packaged separately, as long as a ring-shaped packaging structure connected end to end can be formed.

[0059] In step S2, an electrode unit 20 is provided and placed on the packaging film 10. The electrode unit 20 refers to a fixed structure formed by connecting a plurality of electrode plates and related electrical connectors. The packaging film 10 may be provided with a positioning structure, such as a limiting protrusion or a receiving groove, etc., for positioning the electrode unit 20 to improve assembly efficiency. The packaging film 10 has two main body areas with the same or similar areas and a folding area connected between the two main body areas. When placing the electrode unit 20, its main body part can be assembled corresponding to one of the main body areas.

[0060] In step S3 , the packaging film 10 on which the electrode unit 20 is placed is folded to form a structure in which two main regions are located on both sides of the electrode unit 20 in the thickness direction, and the packaging film 10 covers most of the areas on both sides of the electrode unit 20 .

[0061] After the packaging film 10 is folded, two partial regions of the packaging layer 30 are stacked, and the peripheral region near the edge of the packaging layer 30 has a first region 31, a second region 32, a third region 33, and a fourth region 34 arranged in sequence, and the four regions can be arranged end to end. Along the thickness direction, the orthographic projections of the four regions should be staggered with the orthographic projection of the main part of the electrode unit 20.

[0062] Optionally, the first region 31 and the second region 32 may extend in parallel, and the third region 33 and the fourth region 34 may extend in parallel, wherein the first region 31 corresponds to the folding edge, that is, the folding edge of the packaging film 10 is located on the side where the first region 31 is located.

[0063] In steps S4a and S4b, the second region 32 and the third region 33 are respectively heat-pressed and packaged. Hot-melt materials are usually provided on the opposite surfaces of the two stacked packaging layers 30, which can melt and fuse together under a certain temperature and pressure, and form a stable connection after cooling, that is, the packaging layers 30 are melted and tightly combined by high temperature and pressure to form a reliable packaging structure. This method can quickly and effectively complete the packaging, while reducing material waste and processing time.

[0064] In step S4c, the folded edge of the packaging film 10 formed in step S3 is cut off, so that the packaging film 10 forms two independent and unconnected layer structures in the unpackaged area, and the bending stress is released to make the packaging layer 30 flat.

[0065] In step S5a and step S5b, the first region 31 and the fourth region 34 are respectively subjected to heat compression packaging. Optionally, the packaging parameters used in each region may be the same.

[0066] It is understandable that the order of step S4a, step S4b and step S4c can be arbitrarily replaced, or some of the three steps can be performed simultaneously to improve processing efficiency. Similarly, the order of step S5a and step S5b can be arbitrarily replaced, or these two steps can be performed simultaneously. Step S5a and step S5b are performed after step S4c, and at the same time, the order of step S5a, step S5b and step S4a, step S4b can also be arbitrarily replaced, or some of the steps can be performed simultaneously.

[0067] In step S6, the inner cavity formed between the two packaging layers 30 and in each packaging structure is evacuated, and a certain pressure can be maintained to ensure the internal vacuum degree. Optionally, the internal pressure of the sealed cavity can be detected by a pressure instrument to improve the sealing performance. By evacuating the cavity first and then hot pressing, the vacuum degree of the inner cavity can be improved, providing a more stable working environment for the manufactured solid-state battery.

[0068] The combination of stacking the packaging film 10 and hot pressing welding reduces the risk of wrinkles at the joints of the packaging film 10 and improves the flatness of the packaging. At the same time, by cutting off the folded edges to release the bending stress before completing the packaging of the entire area, the flatness of the packaging film 10 and the alignment accuracy between the two packaging layers 30 can be further improved, reducing the possibility of wrinkles in the packaging film 10 during the packaging process, thereby improving the performance of the solid-state battery, including energy density, cycle stability and cycle life.

[0069] It is understandable that the above steps are mainly steps for packaging solid-state batteries. Before step S1, the steps of stacking and connecting the positive electrode sheets and the negative electrode sheets to form an electrode assembly 21, so as to form an electrode unit 20 in subsequent process steps, etc., and after step S4, the steps of performing a sealing test and a capacity test on the packaged solid-state battery, etc., may also be included.

[0070] Please also read Figure 4 and Figure 5 , Figure 4 A partial flow chart of a method for manufacturing a battery cell provided in some embodiments of the present application, Figure 5 for Figure 4 The schematic diagram of the structure corresponding to step S12 is shown. In some optional embodiments, step S1 of providing the packaging film 10 further includes:

[0071] S11, providing film material 11;

[0072] S12, punching out at least one recess 12 on the film material 11;

[0073] S13 , cutting the film material 11 to form a packaging film 10 having a concave portion 12 .

[0074] Optionally, the packaging film 10 can be obtained by punching the recess 12 on the film material 11 and cutting. In step S11, a film material 11 having an area larger than the size of the packaging film 10 is provided. It can be understood that the length and width of the film material 11 here can be larger than the required packaging film 10, or any one of the parameters can be larger than the corresponding parameter of the packaging film 10. By using a film material 11 with a larger area, it is convenient to fix the film material 11 in the subsequent punching step, and it is convenient to straighten the film material 11, so that the position and size of the recess 12 formed by punching are accurate.

[0075] In step S12, a recess 12 for placing the electrode unit 20 is formed on the film material 11 by stamping, and a high-precision recessed structure can be obtained by stamping. In the embodiment where the packaging film 10 has two main body areas and a connecting area connected between the main body areas, two relatively shallow recesses 12 can be punched symmetrically in the two main body areas, or a relatively deep recess 12 can be punched in one of the main body areas. It is only necessary that the inner cavity formed by the recess 12 after the packaging film 10 is folded can accommodate the electrode unit 20.

[0076] In step S3 , the film material 11 is cut to obtain the packaging film 10 . This step may include one or more cutting steps to trim the film material 11 to the same preset size and shape as the packaging film 10 .

[0077] By processing the position for placing the electrode unit 20 on the film material 11, the alignment accuracy of the electrode unit 20 and the packaging film 10 is improved and the packaging film 10 and the electrode unit 20 are more closely attached.

[0078] In some optional embodiments, the step S11 of providing the film material 11 and the step S12 of punching at least one recess 12 on the film material 11 further include:

[0079] S14, pre-cutting the film material 11 to form a pre-cutting track 13;

[0080] The step S13 of cutting the film material 11 also includes:

[0081] The film material 11 is cut along the pre-cutting track 13 .

[0082] Optionally, before the packaging film 10 is formally cut, a pre-cutting step can be provided, specifically, a pre-cutting step S14 can be performed before step S12, that is, pre-cutting is performed at the position where cutting is required in step S13, for example, by cutting a certain depth but not cutting, forming a plurality of mutually spaced cutting openings, etc. Then, in step S13, the film material 11 can be cut along the aforementioned pre-cutting track, thereby making the aluminum-plastic film easier to break, and making the cutting edge smooth and reducing burrs.

[0083] See also Figure 6 , Figure 6 Flowchart of a method for manufacturing a battery cell provided in some other embodiments of the present application. In some optional embodiments, step S2 of providing the electrode unit 20 further includes:

[0084] S21, providing an electrode unit 20, wherein the electrode unit 20 includes an electrode assembly 21 and an electrode lead 22 electrically connected to each other;

[0085] The step S3 of folding the packaging film 10 further includes:

[0086] S31 , stagger the electrode lead 22 and the first region 31 so that at least a portion of the electrode lead 22 protrudes from the packaging layer 30 and is exposed to the outside.

[0087] In step S2, an electrode unit 20 is provided and placed on the packaging film 10. The electrode unit 20 may include an electrode assembly 21 and an electrode lead 22. Specifically, the electrode assembly 21 may include a stacked positive electrode sheet, a separator, and a negative electrode sheet, etc. The positive electrode sheet and the negative electrode sheet may have protruding tabs. The electrode lead 22 may include an adapter sheet or other components for electrical connection. The adapter sheet may be optionally electrically connected to the aforementioned tabs.

[0088] Optionally, in an embodiment having an electrode assembly 21 and an electrode lead 22, the electrode lead 22 can be staggered with the first region 31, that is, the electrode lead 22 can be set at any one of the other three edges except the folded edge, and protrude from the edge in a direction away from the electrode assembly 21, so that the electrode unit 20 can be electrically connected to components such as electrode terminals after packaging.

[0089] Optionally, in an embodiment where the electrode lead 22 is protruding, a glue material or a hot-melt material similar to the inner layer of the packaging film 10 may be provided at a position on the electrode lead 22 corresponding to the area to be packaged, so that the position where the electrode lead 22 passes through the packaging structure still has good sealing performance.

[0090] By arranging the lead end of the electrode unit 20 at the edge of the non-folded side and protruding, the electrode unit 20 can be easily electrically connected to external components and the possibility of interference between the electrode lead 22 and the folded side of the packaging film 10 can be reduced.

[0091] In some optional embodiments, the step S31 of staggering the electrode lead 22 and the first region 31 further includes:

[0092] The electrode lead 22 is at least partially located between the second regions 32 of the two encapsulation layers 30;

[0093] The step S3 of folding the packaging film 10 and the step S4c of cutting off the folded edge of the packaging film 10 further include:

[0094] S4a, hot pressing the second regions 32 of the two packaging layers 30 .

[0095] In the embodiment where the electrode unit 20 includes the electrode assembly 21 and the electrode lead 22, the electrode lead 22 can be arranged close to the second region 32 adjacent to the folded edge. In this embodiment, the step of hot pressing the second region 32 can be arranged before the step S4c of cutting the folded edge, that is, the folded edge is cut after the side where the electrode lead 22 is located is packaged.

[0096] After folding, the packaging film 10 can define the relative position between the upper packaging layer 30 and the lower packaging layer 30 by the folded part that is still connected together. Therefore, the side where the electrode lead 22 is located can be packaged first before the folded edge is cut off. Since the protruding electrode lead 22 structure is provided on this side, it is not easy to correct after misalignment or wrinkles occur, and it is also difficult to cut again. Therefore, this side can be packaged first before cutting off the folded edge to determine the relative position between the upper and lower packaging films 10, reduce the possibility of wrinkles and misalignment, and reduce the possibility of subsequent reprocessing of the side where the electrode lead 22 is located.

[0097] In some optional embodiments, the step S4a of hot pressing the second regions 32 of the two packaging layers 30 and the step S4c of cutting off the folded edges of the packaging film 10 further include:

[0098] S4b, hot pressing the third regions 33 of the two packaging layers 30 .

[0099] Similar to the arrangement of the aforementioned step sequence, the step S4b of hot-pressing and packaging the third region 33 may also be arranged before the step S4c of cutting off the folded edge, so as to further fix the relative position between the two packaging layers 30 .

[0100] In step S4b of hot pressing the third region 33, the hot pressing process parameters and processing equipment used can be the same as those in step S4a of hot pressing the second region 32, and a packaging structure located in the third region 33 is formed that is connected to the packaging structure of the hot pressing stroke in the second region 32, so as to reduce the possibility of leakage at the junction of the two regions.

[0101] By heat-pressing and packaging the third region 33 before cutting off the folded edge, the relative positions between the packaging film 10 and the electrode unit 20 and between the two packaging layers 30 can be further fixed, thereby reducing the possibility of misalignment of the packaging film 10 .

[0102] In some optional embodiments, the step S31 of staggering the electrode lead 22 and the first region 31 further includes:

[0103] The electrode lead 22 is at least partially located between the third regions 33 of the two packaging layers 30;

[0104] The step S3 of folding the packaging film 10 and the step S4c of cutting off the folded edge of the packaging film 10 further include:

[0105] S4b, hot pressing the third regions 33 of the two packaging layers 30 .

[0106] Similar to the embodiment in which the electrode lead 22 is located in the second region 32, the electrode lead 22 can also be located on the opposite side to the folded edge, that is, close to the third region 33. In this embodiment, the step S4b of hot pressing and packaging the third region 33 can also be arranged before the step S4c of cutting off the folded edge. The relative positions of the two packaging layers 30 are fixed by hot pressing and packaging the third region 33, thereby reducing the possibility of dislocation and wrinkles in the packaging layer 30, thereby improving the reliability of the packaging structure.

[0107] Optionally, after step S4b, step S4c of cutting off the folded edge may be performed, or step S4c may be performed after step S4a of hot pressing the second region 32. The specific effect is the same as that of the embodiment in which the electrode lead 22 is located in the second region 32, and the present application will not repeat it here.

[0108] In some optional embodiments, the step S1 of providing the packaging film 10 and the step S2 of providing the electrode unit 20 further include:

[0109] S15, cutting at least one side edge of the packaging film 10 to obtain an edge line of a preset shape;

[0110] The step S2 of providing the electrode unit 20 further includes:

[0111] S22, placing the electrode lead 22 on the side where the cut edge is located.

[0112] Before providing the electrode unit 20 and placing the electrode unit 20 on the packaging film 10, at least one side edge of the packaging film 10 may be cut to correct its shape. The cut edge should include a side edge close to the electrode lead 22 after the electrode unit 20 is arranged, thereby reducing the possibility of cutting or trimming one side of the electrode lead 22 again after the packaging film 10 is folded or even after at least a part of the area is packaged, thereby reducing the possibility of damage to the electrode lead 22.

[0113] Optionally, in the step of cutting the edge of the packaging film 10 , the side where the electrode lead 22 is located may be cut, or a plurality of edges may be cut simultaneously to improve the shape accuracy of the packaging film 10 .

[0114] Optionally, after each area on the encapsulation layer 30 is encapsulated, a step of trimming the edges may be included. In this step, the cutting lines of each edge may pass through each encapsulation area, that is, part of the encapsulation structure is trimmed to reduce the edge width and make the shape of the battery matrix regular.

[0115] In some optional embodiments, when the hot pressing is completed in part of the first area 31, the second area 32, the third area 33 and the fourth area 34, the step S6 of evacuating the inner cavity between the two packaging layers 30 includes:

[0116] S61, hot-pressing three of the first area 31, the second area 32, the third area 33 and the fourth area 34 of the packaging layer 30, and evacuating the inner cavity between the two packaging layers 30 from the other one;

[0117] S62, hot pressing and vacuumizing one side area, and connecting the packaging areas in the first area 31, the second area 32, the third area 33 and the fourth area 34 end to end.

[0118] Optionally, before evacuating the inner cavity between the encapsulation layers 30, any three of the first area 31 to the fourth area 34 can be encapsulated first, and then the inner cavity is evacuated at the edge of one side where the last area is located. After the vacuuming is completed, the side is encapsulated, thereby improving the sealing of the inner cavity and further improving the stability of the operation of the solid-state battery.

[0119] Optionally, taking the first area 31 as the folding edge and the second area 32 as the side where the electrode lead 22 is located as an example, the first area 31, the second area 32 and the third area 33 can be hot-pressed and packaged, and then the inner cavity is evacuated at the edge of the side where the fourth area 34 is located. After reaching a preset vacuum standard, the fourth area 34 is packaged.

[0120] This packaging method can reduce the number of times the packaging film 10 is heated and pressurized, while improving the sealing of the solid-state battery.

[0121] Please also read Figures 7 to 9 , Figure 7 A schematic diagram of the structure of a battery processing device provided in some embodiments of the present application, Figure 8 A schematic diagram of the structure of a folding assembly provided in some embodiments of the present application, Fig. 9 A schematic diagram of the structure of a negative pressure assembly provided in some embodiments of the present application.

[0122] In the second aspect, the embodiment of the present application provides a battery processing device 100, including a stamping component 101, a folding component 102, a packaging component 103, a first cutting component 104 and a negative pressure component 105. The stamping component 101 is used to form a recess 12 on the packaging film 10; the folding component 102 is used to fold and press the packaging film 10 to form two stacked packaging layers 30; the packaging component 103 is used to hot press the packaging layer 30 to form a packaging structure; the first cutting component 104 is used to cut off the folded edge of the packaging film 10; the negative pressure component 105 is used to draw negative pressure between the packaging layers 30 and package the packaging film 10. A first cutting mechanism for cutting the folded edge of the packaging film 10 is provided in the battery processing device 100 to reduce the possibility of wrinkles in the packaging film 10 during the negative pressure drawing process.

[0123] The embodiment of the present application also provides a battery processing device 100 for executing the manufacturing method proposed in any embodiment of the first aspect. Specifically, the battery processing device 100 includes a stamping component 101, a folding component 102, a packaging component 103, a first cutting component 104 and a negative pressure component 105. The stamping component 101 is used to form a recess 12 on the film material 11 to obtain a packaging film 10. The folding component 102 can fold the packaging film 10 in a manner that the two supporting parts are interlocked by rotating at least one of the two supporting parts, so that the packaging film 10 forms two packaging layers 30 located on both sides of the electrode unit 20, respectively.

[0124] The packaging assembly 103 includes two sealing heads arranged opposite to each other, and can connect the upper and lower packaging layers 30 to each other by heating and pressurizing to form a packaging structure. Optionally, when the packaging film 10 has multiple areas that need to be packaged, the battery processing equipment 100 can be provided with multiple packaging assemblies 103, or the packaging assembly 103 can be provided with multiple pairs of sealing heads arranged opposite to each other to improve processing efficiency.

[0125] The first cutting assembly 104 is used to cut the packaging film 10, specifically to cut off the folded edge of the packaging film 10, and make the packaging film 10 into two independent packaging layers 30. Optionally, after cutting, the length of the packaging film 10 on this side that exceeds the electrode unit 20 can be the same or similar to the length of the packaging film 10 on the opposite side that exceeds the electrode unit 20. By cutting the folded edge before completing the packaging, the bending stress in the packaging film 10 can be released, making the packaging film 10 more conformable and flat, reducing the possibility of wrinkles, and improving the reliability of the solid-state battery.

[0126] The negative pressure component 105 is used to evacuate the space between the two packaging layers 30 after at least part of the surrounding area of ​​the packaging layer 30 has been packaged, and then perform hot-pressing packaging on the remaining unpackaged area after the air in the inner cavity is discharged, thereby enabling the inner cavity between the packaging layers 30 to have a good vacuum degree.

[0127] Optionally, the battery processing device 100 can be used to process a solid-state battery, which generally includes a housing and an electrode assembly 21. The housing has an inner cavity, and the electrode assembly 21 is disposed in the inner cavity. The electrode assembly 21 includes a stacked positive electrode sheet and a negative electrode sheet. A solid electrolyte is disposed on the electrode sheet.

[0128] Optionally, the solid electrolyte includes one or more of a sulfide solid electrolyte, an oxide solid electrolyte, a halide solid electrolyte and a polymer solid electrolyte. The sulfide solid electrolyte includes a sulfide crystalline solid electrolyte, a sulfide glass and a glass ceramic solid electrolyte.

[0129] The battery processing equipment 100 provided in the embodiment of the present application has all the beneficial effects of the battery cell manufacturing method in any of the embodiments of the first aspect mentioned above. For details, please refer to the specific description of the manufacturing method in the above embodiments, and this embodiment will not be repeated here.

[0130] In some optional embodiments, the battery processing equipment 100 further includes a second cutting component, which is used to cut at least one side edge of the packaging film 10 to obtain an edge line of a preset shape.

[0131] Optionally, the packaging film 10 used in the packaging process usually needs to be cut before formal use, such as cutting or trimming the edge shape and size at a preset position. Therefore, the battery processing equipment 100 may also include a second cutting component for implementing the aforementioned edge cutting step, such as cutting the edge of one side of the packaging film 10 that is close to the electrode lead 22 after the electrode unit 20 is set, so as to trim it to a preset shape before the electrode lead 22 is set there, thereby reducing the possibility of damaging the electrode lead 22 due to the need to cut this side again in subsequent process steps.

[0132] Optionally, the second cutting assembly can be arranged upstream of the folding assembly 102, and the first cutting assembly 104 can be arranged downstream of the packaging assembly 103 or downstream of the folding assembly 102. The specific position can be adjusted according to the order of packaging and cutting steps. By arranging the second cutting assembly upstream to trim the edge of the packaging film 10, the moving path of the battery matrix to be packaged during the processing can be simplified, thereby improving the processing efficiency.

[0133] In some optional embodiments, the battery processing equipment 100 also includes a conveying component, which is used to transport the packaging film 10 and the electrode assembly 21, one end of the conveying component is connected between the stamping component 101 and the folding component 102, and the other end of the conveying component is connected to the first cutting component 104; the first cutting component 104 is also used to cut at least one side edge of the packaging film 10 to obtain an edge line of a preset shape.

[0134] Corresponding to the aforementioned method of setting the second cutting component, the battery processing equipment 100 can also make the step of cutting the edge of the packaging film 10 and the step of cutting the folded edge share the first cutting component 104. Specifically, a conveying component can be set, and one end of it is located near the stamping component 101 and the folding component 102, and the other end is set close to the first cutting component 104, so that when the packaging film 10 needs to be cut, it can be transported to the location of the first cutting component 104 for cutting processing. At this time, the first cutting component 104 can be set downstream of the packaging component 103 or downstream of the folding component 102.

[0135] By reusing the first cutting assembly 104 as a mechanism for trimming the edge of the packaging film 10 , the cost of the battery processing equipment 100 can be reduced while saving space.

[0136] The present application provides a method for manufacturing a battery cell, comprising: S1, providing a packaging film 10; S2, providing an electrode unit 20 and placing the electrode unit 20 on the packaging film 10, so that the electrode unit 20 includes an electrode assembly 21 and an electrode lead 22 that are electrically connected to each other; S3, folding the packaging film 10 so that the packaging film 10 forms two packaging layers 30, wherein at least a portion of the electrode unit 20 is located between the two packaging layers 30, and the periphery of the packaging layer 30 has a first region 31, a second region 32, a third region 33 and a fourth region 34 that are sequentially arranged, the first region 31 corresponds to the folded portion of the packaging film 10, and the electrode lead 22 is staggered from the first region 31 , so that the electrode lead 22 at least partially protrudes from the packaging layer 30 and is exposed to the outside; S4a, hot pressing the second area 32 of the two packaging layers 30; S4b, hot pressing the third area 33 of the two packaging layers 30; S4c, cutting off the folded edge of the packaging film 10; S5a, after cutting off the folded edge, hot pressing the first area 31 of the two packaging layers 30; S5b, after cutting off the folded edge, hot pressing the fourth area 34 of the two packaging layers 30; S6, when three of the first area 31, the second area 32, the third area 33 and the fourth area 34 are hot pressed, the inner cavity between the two packaging layers 30 is evacuated through the position of the other one, and then the other one is hot pressed and packaged.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for manufacturing a battery cell, characterized in that: include: Providing encapsulation film; Providing an electrode unit, and placing the electrode unit on the packaging film; Folding the packaging film so that the packaging film forms two packaging layers, wherein at least part of the electrode unit is located between the two packaging layers, and the periphery of the packaging layer has a first area, a second area, a third area and a fourth area which are sequentially arranged, and the first area corresponds to the folded portion of the packaging film; hot pressing the second regions of the two packaging layers; hot pressing the third regions of the two packaging layers; After hot pressing the second region and the third region, cutting off the folded edge of the packaging film; After cutting off the folded edge, hot pressing the first regions of the two packaging layers; After cutting off the folded edge, hot pressing the fourth regions of the two packaging layers; When the hot pressing is completed in a part of the first region, the second region, the third region and the fourth region, the inner cavity between the two packaging layers is evacuated.

2. The manufacturing method according to claim 1, characterized in that: The step of providing a packaging film comprises: Provide film materials; Punching at least one recess on the film material; The film material is cut to form a packaging film having the concave portion.

3. The manufacturing method according to claim 2, characterized in that: The step of providing the packaging film also includes: Pre-cutting the film material to form a pre-cutting track; The step of cutting off the film material also includes: The film material is cut along the pre-cutting track.

4. The manufacturing method according to claim 1, characterized in that: The step of providing an electrode unit comprises: Providing an electrode assembly and an electrode lead, and connecting the electrode assembly to the electrode lead to prepare an electrode unit; The step of folding the packaging film comprises: The electrode lead is staggered with the first region so that at least a portion of the electrode lead protrudes from the packaging layer and is exposed to the outside.

5. The manufacturing method according to claim 4, characterized in that: The step of staggering the electrode lead and the first region comprises: The electrode lead is at least partially located between the second regions of the two packaging films; The step of hot pressing the second regions of the two packaging layers and the step of cutting off the folded edges of the packaging film includes: The third regions of the two packaging layers are heat-pressed.

6. The manufacturing method according to claim 4, characterized in that: The step of staggering the electrode lead and the first region comprises: The electrode lead is at least partially located between the third regions of the two packaging films.

7. The manufacturing method according to claim 4, characterized in that: The step of providing the packaging film and the step of providing the electrode unit further include: Cutting at least one side edge of the packaging film to obtain an edge line of a preset shape; The step of providing an electrode unit also includes: The electrode lead is arranged on the side where the cut edge is located.

8. The manufacturing method according to claim 1, characterized in that: When the hot pressing is completed in the first region, the second region, the third region, and a part of the fourth region, the step of evacuating the inner cavity between the two packaging layers comprises: hot pressing three of the first region, the second region, the third region and the fourth region of the packaging layer, and evacuating the inner cavity between the two packaging layers from another region; One side area is vacuumed by hot pressing, and the packaging areas in the first area, the second area, the third area and the fourth area are connected end to end.

9. A battery processing device, characterized in that: For implementing the manufacturing method according to any one of claims 1 to 8, the battery processing equipment comprises: A punching assembly, used for forming a recess on the packaging film; A folding assembly, used for folding and pressing the packaging film to form two stacked packaging layers; A packaging component, used for hot pressing the packaging layer to form a packaging structure; A first cutting component, used for cutting off the folded edge of the packaging film, wherein the first cutting component is arranged downstream of the packaging component; The negative pressure component is used to draw negative pressure between the packaging layers and package the packaging film.

10. The battery processing equipment according to claim 9, characterized in that: The battery processing equipment also includes a second cutting component, which is used to cut at least one side edge of the packaging film to obtain an edge line of a preset shape.

11. The battery processing equipment according to claim 9, characterized in that: The battery processing equipment further includes a conveying assembly, the conveying assembly is used to transport the packaging film and the electrode assembly, one end of the conveying assembly is connected between the stamping assembly and the folding assembly, and the other end of the conveying assembly is connected to the first cutting assembly; The first cutting assembly is also used to cut at least one side edge of the packaging film to obtain an edge line of a preset shape.

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