Pinching and folding mechanism, battery cell manufacturing device, battery cell manufacturing method, laminated material strip and battery cell

Abstract

A pinching and folding mechanism, a battery cell manufacturing device, a battery cell manufacturing method, a laminated material strip and a battery cell. The pinching and folding mechanism comprises at least one pinching and folding assembly arranged on a conveying path for a material strip, wherein each pinching and folding assembly is configured to perform a pinching and folding operation on a material strip located in the conveying path; and the pinching and folding operation comprises forming, on the material strip, arched portions that arch in the direction of thickness of the material strip, and pinching the arched portions to form pinched portions on the material strip. When a battery cell is produced, each pinching and folding assembly in the pinching and folding mechanism can be used to perform pinching and folding at fold positions on a laminated material strip so as to form pinched portions; and during lamination, the laminated material strip can be folded successively at the pinched portions. The fold positions on the laminated material strip are accurately positioned by using the pinched portions, thus being conducive to improving the lamination precision of the laminated material strip and improving the quality of the battery cell.

Description

Pinching mechanism, battery cell manufacturing device, battery cell manufacturing method, laminated material strip and battery cell

[0001] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on November 16, 2023, with application number 202311535539.2, entitled “Pinching mechanism, battery cell manufacturing device, battery cell manufacturing method, laminated material strip and battery cell,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of battery manufacturing technology, and in particular to a pinching and folding mechanism, a battery cell manufacturing device, a battery cell manufacturing method, a laminated material strip, and a battery cell. Background Art

[0003] Lithium-ion battery cells primarily have two structures: wound and laminated. Laminated cells are made by stacking the positive electrode, negative electrode, and separator in sequence to create a bare cell, which is then pressed and packaged to form a complete battery. Currently, laminated cells are mostly prepared using a "Z"-shaped lamination method. During lamination, the separator between two adjacent electrodes folds to form a folded angle. However, the folded angles formed by separators in different positions cannot be uniform, resulting in large deviations in the alignment accuracy between the electrodes of the laminated cell, affecting the cell quality.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a pinching and folding mechanism, a battery cell making device, a battery cell making method, a stacking material strip and a battery cell to address the problem that the battery stacking accuracy is not high and affects the quality of the battery cell.

[0006] In a first aspect, an embodiment of the present application provides a pinch-folding mechanism, comprising:

[0007] At least one pinching and folding component is arranged on the conveying path of the material belt, and each pinching and folding component is used to perform a pinching and folding operation on the material belt located on the conveying path. The pinching and folding operation includes forming an arched portion on the material belt that is arched along the thickness direction of the material belt, and pinching the arched portion to form a pinching portion on the material belt.

[0008] In some embodiments, the pinching and folding assembly includes an arched belt member and a kneading member, and the kneading member forms a kneading space;

[0009] The belt arching member is used to allow the material belt located in the conveying path to enter the kneading space and form the arched portion, and the kneading member is used to knead the arched portion located in the kneading space to form the kneading portion.

[0010] In some embodiments, the belt arch member is movably provided, and during movement, the material belt located on the conveying path can enter the kneading space to form the arched portion;

[0011] The kneading element includes two kneading sub-elements spaced apart from each other, wherein the kneading space is formed between the two kneading sub-elements. The two kneading sub-elements are relatively movable, and the size of the kneading space can be adjusted during the movement to knead the arched portion located in the kneading space.

[0012] In some embodiments, the belt arch member includes a belt arch pressure rod, which is movably provided and can push the material belt located in the conveying path into the kneading space to form the arched portion during movement.

[0013] In some embodiments, the pinching and folding assembly includes a heating element, which is disposed on the pinching and folding assembly and is used to heat the pinching and folding assembly during the pinching operation.

[0014] In some embodiments, all of the pinching and folding components are used to form a plurality of the pinching portions on the material strip that are spaced apart along the extension direction of the material strip, and the arching directions of every two adjacent pinching portions are opposite.

[0015] In some embodiments, the at least one pinching and folding assembly includes a first pinching and folding assembly and a second pinching and folding assembly spaced apart along the conveying path, and the pinching portions formed on the material strip by the first pinching and folding assembly have opposite arching directions.

[0016] In some embodiments, the pinching mechanism also includes a detection member, which is used to obtain characteristic information of the material belt located on the conveying path, and locate the area to be pinched and folded of the material belt based on the characteristic information, and the pinching component is used to perform the pinching operation on the located area to be pinched and folded.

[0017] In a second aspect, embodiments of the present application provide a cell manufacturing device capable of manufacturing cells using a composite material strip, the composite material strip comprising a diaphragm material strip and a plurality of electrode groups spaced apart along an extension direction of the diaphragm material strip. The cell manufacturing device comprises a stacking platform and the pinching and folding mechanism described in the above embodiment; the stacking platform is located downstream of the pinching and folding mechanism.

[0018] The pinching and folding mechanism is used to perform a pinching operation on the composite material strip to form the pinching portion in the region of the composite material strip between two adjacent electrode groups to output the laminated material strip, and the arching directions of two adjacent pinching portions in the laminated material strip are opposite;

[0019] The battery core making device can fold the laminated material strips in sequence at each of the kneading parts and fold them on the lamination platform to form battery cores.

[0020] In some embodiments, the battery cell manufacturing device further includes a feeding mechanism and a thermal composite mechanism, wherein the feeding mechanism is used to transport the diaphragm material strip and multiple sets of electrode sheets to the thermal composite mechanism;

[0021] The thermal composite mechanism is used to thermally composite the diaphragm material strip and each group of the pole pieces to output the composite material strip.

[0022] In some embodiments, the battery cell making device further comprises a cutter mechanism, wherein the cutter mechanism is located downstream of the pinching and folding mechanism and is arranged upstream of the lamination platform;

[0023] The cutter mechanism includes a cutter portion for cutting the laminated material strip.

[0024] In some embodiments, the cutter mechanism further includes a heat sealing portion, which is used to heat seal the cut ends of the laminated material strip cut by the cutter portion.

[0025] In a third aspect, an embodiment of the present application provides a method for manufacturing a battery cell, comprising:

[0026] Providing a composite material strip, the composite material strip comprising a diaphragm material strip and a plurality of pole piece groups spaced apart along an extension direction of the diaphragm material strip;

[0027] Performing a kneading operation on the composite material strip to form a kneading portion in a region of the composite material strip between two adjacent electrode groups to output a laminated material strip, wherein the arching directions of two adjacent kneading portions in the laminated material strip are opposite;

[0028] The laminated material strip is folded in sequence at each of the kneading parts to obtain a battery cell in which a plurality of the electrode groups are stacked.

[0029] In some embodiments, the step of providing a composite tape includes:

[0030] Providing a diaphragm material strip and a plurality of groups of pole pieces spaced apart along an extension direction of the diaphragm material strip;

[0031] Each group of pole pieces is thermally composited onto the diaphragm material strip to obtain the composite material strip.

[0032] In some embodiments, after the laminated strips are folded in sequence at the kneading portions to obtain a battery cell in which a plurality of electrode groups are stacked, the method includes:

[0033] Cut off the connection between the unfolded laminated strip and the battery cell;

[0034] The cut ends of the unfolded laminated web are heat sealed.

[0035] In a fourth aspect, an embodiment of the present application provides a laminated material strip, comprising a diaphragm material strip and a plurality of electrode groups spaced apart along an extension direction of the diaphragm material strip, wherein the electrode of each electrode group is stacked with the diaphragm material strip;

[0036] The area of ​​the laminated strip located between two adjacent pole piece groups is arched and kneaded along the thickness direction of the laminated strip to form a plurality of kneading portions spaced apart along the extension direction of the laminated strip, and the arching directions of adjacent kneading portions are opposite.

[0037] In some embodiments, the diaphragm material strip includes two layers, the electrode group includes a first electrode and a second electrode, the second electrode is arranged between the two layers of the diaphragm material strip, the first electrode is arranged on the outer layer of the laminated material strip, and the first electrode of adjacent electrode groups are located on opposite sides of the laminated material strip; all the diaphragm material strips located between two adjacent electrode groups are arched and pinched to form the pinching portion.

[0038] In some embodiments, the separator strips forming the kneading portion are adhered to each other.

[0039] In a fifth aspect, an embodiment of the present application provides a battery cell, characterized in that the battery cell is formed by folding the laminated material strip as described above in sequence at each of the kneading parts.

[0040] The above-mentioned pinching and folding mechanism, battery cell making device, battery cell making method, laminated material strip and battery cell can use the pinching and folding components in the pinching and folding mechanism to pinch and fold the corner positions of the laminated material strip to form pinching parts when producing battery cells. When stacking, the laminated material strip can be folded in turn at each pinching part, and the pinching part can be used to accurately locate the corner position of the laminated material strip, which helps to improve the stacking accuracy of the laminated material strip and improve the quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0042] FIG1 is a schematic structural diagram of a pinching and folding mechanism according to some embodiments of the present application.

[0043] FIG2 is a schematic diagram of the structure of a folded material strip according to some embodiments of the present application.

[0044] FIG3 is a schematic diagram of the pinching and folding process of the pinching and folding assembly in some embodiments of the present application.

[0045] FIG4 is a system schematic diagram of a battery cell manufacturing device according to some embodiments of the present application.

[0046] FIG5 is a schematic diagram of the structure of a composite material strip according to some embodiments of the present application.

[0047] FIG6 is a schematic structural diagram of composite material strips according to other embodiments of the present application.

[0048] FIG7 is a schematic diagram of the structure of the laminated material strips according to some embodiments of the present application.

[0049] FIG8 is a schematic flow chart of a method for manufacturing a battery cell according to some embodiments of the present application.

[0050] FIG9 is a schematic flow chart of a method for manufacturing a battery cell according to other embodiments of the present application.

[0051] The accompanying drawings in the specific implementation manner are as follows:

[0052] 1000. Cell manufacturing device; 100. Pinching mechanism; 10. Pinching assembly; 10A. First pinching assembly; 10B. Second pinching assembly; 11. Arched belt member; 12. Kneading member; N. Kneading space; 12c. Kneading sub-member; 20. Heating member; 30. Detection member; 200. Cutter mechanism; 201. Cutter portion; 202. Heat sealing portion; 300. Feeding mechanism; 301. Conveying roller; 400. Lamination platform; 500. Thermal lamination mechanism; 501. Pressing roller; 1. Composite material strip; 2. Lamination material strip; g. Arched portion; G. Kneading portion; 1A. Electrode group; A1. First electrode; A2. Second electrode; 1B. Diaphragm material strip; L. Material strip. DETAILED DESCRIPTION

[0053] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0054] In the description of the present application, it should be understood that, if any, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] Furthermore, if used, the terms "first" and "second," if present, are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0056] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connected," and "fixed" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0058] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0059] The preparation of laminated lithium batteries usually adopts a "Z"-shaped lamination. During lamination, the corners between adjacent lamination units are called folding positions. At present, the folding positions are usually generated during the lamination process. It is easy for the folding positions of each layer of lamination units in the lamination to be inconsistent, and the lamination accuracy is not high, which affects the battery quality. Therefore, it is necessary to improve the consistency of the folding positions between each lamination unit, improve the lamination accuracy and battery quality. Based on this, the embodiment of the present application provides a pinching and folding mechanism, which can pinch and fold the folding positions on the material to be folded before the lamination operation, accurately locate each folding position, and fold the material to be folded with each folding position as the center during lamination, which can improve the lamination accuracy and battery quality.

[0060] The pinching and folding mechanism proposed in the embodiment of the present application can be applied to, but is not limited to, battery stacks. It can be applied to other products that require "Z"-shaped folding. When the pinching and folding mechanism is applied to the battery stack, the object in the battery stack that is pinched and folded by the pinching and folding mechanism varies depending on the specific structure of the stack. In some examples, when the battery stack is formed by stacking four layers of material, namely, the negative electrode sheet, the diaphragm strip, the positive electrode sheet, and the diaphragm strip, and then folding them in a "Z" shape, the pinching and folding mechanism can pinch and fold the four layers of material simultaneously in the extension direction of the four-layer material structure to obtain a plurality of sequentially spaced pinching portions, and the position of the pinching portion is the folding position.

[0061] First, the pinching and folding mechanism provided in the first aspect of the embodiment of the present application is introduced.

[0062] Please refer to Figure 1. The pinching and folding mechanism 100 provided in the embodiment of the present application includes at least one pinching and folding component 10, which is arranged on the conveying path of the material strip L. Each pinching and folding component 10 is used to perform a pinching and folding operation on the material strip L located on the conveying path. The pinching and folding operation includes forming an arched portion g on the material strip L that is arched along the thickness direction of the material strip L, and pinching the arched portion g to form a pinching portion G on the material strip L.

[0063] The pinching and folding assembly 10 is positioned along the conveying path of the material strip L and is capable of performing pinching and folding operations on the material strip L along its path. The conveying path of the material strip L can be a straight path, a curved path, a broken line path, or the like. In the embodiment shown in FIG1 , the conveying path is a straight path. The material strip L is not limited to the material strip L mentioned above for preparing battery stacks.

[0064] Typically, the pinching and folding assembly 10 has a pinching and folding station located on a conveying path, and the material strip L passes through the pinching and folding station during conveying. The pinching and folding assembly 10 can perform a pinching and folding operation on the material strip L located at the pinching and folding station.

[0065] The pinching and folding operation includes two steps: arching the web L along its thickness to form a raised portion G on the web L, and pinching the raised portion G. These two steps can be performed first, with arching the web L forming the raised portion G, followed by pinching the raised portion G, or both steps can be performed simultaneously. As shown in Figure 2, the pinched portion G formed on the web L is configured to protrude in the thickness direction of the web L.

[0066] It is understood that the arched portion g includes multiple parts that are bent and connected in sequence. These multiple parts can be connected in a V-shape, W-shape, U-shape, or other shape. The pinching and folding assembly 10 pinches the arched portion g by pressing the multiple parts together. For example, a V-shaped, W-shaped, U-shaped arched portion g can be pressed together to form an I-shaped structure. The arched portion g is pinched to form a pinched portion G. During the lamination process, the material strip L is bent around the pinched portion G. The direction of pinching the arched portion g is generally a direction that intersects the direction of the arching of the arched portion g.

[0067] In practical applications, the folding components 10 in the folding mechanism 100 can be used to fold the strip L used to produce battery stacks to form kneading portions G at the corners of the strip L. In this way, the strip L can be folded sequentially at each kneading portion G. The kneading portions G can be used to precisely locate the corners of the strip L, thereby improving the lamination accuracy of the strip L and enhancing product quality.

[0068] In some embodiments, referring to FIG. 1 , a pinching and folding assembly 10 includes an arching belt member 11 and a kneading member 12 . The kneading member 12 defines a kneading space N. The arching belt member 11 is configured to allow a material strip L located on a conveying path to enter the kneading space N and form an arched portion g. The kneading member is configured to knead the arched portion g located in the kneading space N to form a kneading portion G.

[0069] The arch belt member 11 can directly contact the material belt L or not contact the material belt L to cause the material belt L to arch, and send the arched material belt L into the kneading space N. For example, the arch belt member 11 includes a negative pressure adsorption member, which can negatively adsorb the material belt L and pull the material belt L to arch. For another example, the arch belt member 11 includes a positive pressure blowing member, which can blow out positive pressure gas to push the material belt L to arch. It should be noted that in the embodiment of the present application, the arch belt member 11 can arch the material belt L by pulling or pushing. When the material belt L is arched into place, it can be located in the kneading space N and form an arched portion g.

[0070] The kneading element 12 can fold the material web L within the kneading space N. It is understood that the size of the kneading space N of the kneading element 12 is variable. For example, the kneading element 12 comprises two pressing plates hinged at one end and separated at the other end. Rotating the two pressing plates relative to their hinged ends can change the size of the kneading space N between them, thereby kneading the arched portion g. For another example, the kneading element 12 comprises two airbag elements, separated by a gap to form the kneading space N. The size of the kneading space N can be varied by varying the gas content injected into the airbag elements, thereby kneading the arched portion g.

[0071] In actual operation, the arching belt member 11 may first cause the material strip L to arch into the kneading space N to form the arched portion g, and then the kneading member 12 may knead the material strip L in the kneading space N. Alternatively, the arching belt member 11 and the kneading member 12 may operate synchronously to knead the arched portion g during the process of moving the arched portion g.

[0072] At this time, the material strip L is pinched and folded by the cooperation of the arching strip member 11 and the kneading member 12 , which has a simple structure and is easy to implement.

[0073] In some embodiments, referring to FIG. 3 , the belt arch member 11 is movably provided, and during the movement, the material belt L located on the conveying path can enter the kneading space N to form the arched portion g.

[0074] In one example, the arch belt member 11 is arranged on the side of the kneading space N away from the material strip L. A clamping claw or adsorption structure can be provided on the arch belt member 11 to pick up the material strip L. The arch belt member 11 pulls the material strip L into the kneading space N during movement.

[0075] At this time, the moving belt arching member 11 can reliably cause the material strip L to arch.

[0076] In some embodiments, referring to FIG. 3 , the belt arch member 11 includes a belt arch pressure rod, which is movably provided and can push the material belt L located in the conveying path into the kneading space N to form a raised portion g during movement.

[0077] Specifically, the belt arching bar is movably disposed relative to the kneading element 12 in the thickness direction of the material web L. The kneading space N of the kneading element 12 is located in the movement path of the belt arching bar. During movement, the belt arching bar can push a portion of the material web L into the kneading space N, forming a raised portion g. It will be understood that the belt arching element 11 and the kneading element 12 are arranged on opposite sides of the conveying path in the thickness direction of the material web L.

[0078] At this time, the arch belt member 11 has a simple structure and a simple movement mode, and is easy to implement.

[0079] In some embodiments, continuing to refer to Figure 3, the kneading element 12 includes two kneading sub-elements 12c arranged at an interval, and a kneading space N is formed between the two kneading sub-elements 12c. The two kneading sub-elements 12c can move relative to each other, and the size of the kneading space N can be adjusted during the movement to knead the arched portion g located in the kneading space N.

[0080] The two kneading sub-elements 12c move in a direction corresponding to the extension direction of the material strip L, thereby adjusting the size of the kneading space N along the extension direction of the material strip L and kneading the arched portion g within the kneading space N. Specifically, one of the two kneading sub-elements 12c can be fixed while the other is movable. Alternatively, both kneading sub-elements 12c can be movable.

[0081] The kneading sub-element 12c may include at least one kneading block, or may include multiple kneading blocks. The two kneading sub-element 12c are arranged relative to each other in the direction of movement. Each kneading assembly 10 also includes a kneading drive member, which is connected to at least one of the two kneading sub-element 12c and drives the kneading sub-element 12c to move. The kneading drive member may be a linear motor, a telescopic cylinder, or the like. Generally, the pressure applied by the kneading element 12 on the arched portion g can be adjusted by adjusting the gap between the kneading sub-element 12c.

[0082] At this time, the kneading sub-element 12c has a simple structure and a simple movement mode, and is easy to implement.

[0083] 3 , the pinching process of the pinching and folding assembly 10 in some embodiments is illustrated: in state a, the material strip L passes through the pinching and folding station of the pinching and folding assembly 10; in state b, the arched belt member 11 of the pinching and folding assembly 1 pushes the material strip L into the kneading space N of the kneading member 12, and forms an arched portion g; in state c, the two kneading sub-elements 12c in the kneading member 12 approach each other, and the arched belt member 11 exits the kneading space N; in state d, the two kneading sub-elements 12c clamp the material arched portion g in the kneading space N to form a kneading portion G on the material strip L.

[0084] In some embodiments, the pinching and folding assembly 10 includes a heating element 20 . The heating element 20 is disposed on the pinching and folding assembly 10 and is used to heat the pinching and folding assembly 10 when the pinching and folding assembly 10 performs a pinching operation.

[0085] The heating element 20 can be a heating wire, a heating plate, etc., and its specific type is not limited, as long as it can generate heat. Specifically, when the pinching and folding assembly 10 includes a kneading element 12 and an arched belt element 11, the heating element 20 can be disposed on the kneading element 12 and / or the arched belt element 11.

[0086] In actual use, during the process of the arch belt member 11 arching the material strip L to form the arch portion g, and / or during the process of the kneading member 12 kneading the arch portion g, the heating member 20 can be used to heat the arch portion g, so that the various parts of the arch portion g are kneaded more firmly and the shaping effect of the kneading portion G is better.

[0087] In some embodiments, referring to FIG. 2 , all the pinching and folding components 10 are used to form a plurality of pinching portions G on the material strip L that are spaced apart along the extending direction of the material strip L, and the arching directions of every two adjacent pinching portions G are opposite.

[0088] For example, a single pinching assembly 10 can be used to form at least two pinching portions G spaced apart on the web L, each curved in opposite directions. For example, the pinching mechanism 100 includes a flipping drive that flips the pinching assembly 10 in the thickness direction of the web L, allowing the pinching assembly 10 to switch between two pinching states. In one pinching state, the pinching assembly 10 can arch the web L from a first side toward a second side in the thickness direction to form the pinching portion G. In the other pinching state, the pinching assembly 10 can arch the web L from the second side toward the first side to form the pinching portion G.

[0089] In actual application, when performing Z-shaped lamination, the folding directions of the kneading parts G are roughly opposite. At this time, the arching directions of each adjacent kneading part G are opposite, which makes lamination more convenient.

[0090] In some embodiments, referring to FIG. 1 , at least one pinching and folding assembly 10 includes a first pinching and folding assembly 10A and a second pinching and folding assembly 10B spaced apart along the conveying path, and the pinching portions G formed on the material strip L by the first and second pinching and folding assemblies 10A and 10B have opposite arching directions.

[0091] In order to enable all the pinching and folding assemblies 10 to make the arching directions of each two adjacent pinching parts G opposite, two groups of pinching and folding assemblies 10 are set at this time, one group of pinching and folding assemblies 10 makes the pinching part G arch from the first side of the material strip L to the second side, and the other group of pinching and folding assemblies 10 makes the pinching part G arch from the second side of the material strip L to the first side.

[0092] At this time, the pinching and folding mechanism 100 is designed with two groups of pinching and folding components 10 to arch the material strip L in different arching directions, so that each group of pinching and folding components 10 forms a pinching portion G with opposite arching directions on the material strip L, which helps to simplify the structure of the pinching and folding mechanism 100, reduce costs, and simplify control.

[0093] In some embodiments, please refer to Figure 1, the pinching and folding mechanism 100 also includes a detection part 30, which is used to obtain characteristic information of the material strip L located in the conveying path, and locate the area to be pinched and folded of the material strip L according to the characteristic information, and the pinching and folding component 10 is used to perform a pinching operation on the located area to be pinched and folded.

[0094] The inspection member 30 can obtain characteristic information of the material strip L. For example, the inspection member 30 may include a CCD camera, which captures image information of the material strip L as characteristic information and locates the area of ​​the material strip L to be pinched and folded based on the image information. For another example, the inspection member 30 may include an ultrasonic thickness gauge, which captures thickness information of the material strip L as characteristic information and locates the area of ​​the material strip L to be pinched and folded based on the thickness information, thereby adapting to situations where the thickness of the area to be pinched and folded is relatively large or relatively small.

[0095] If the characteristic information acquired by the detection element 30 includes one of the to-be-folded areas of the web L, it indicates that another to-be-folded area of ​​the web L is passing through the pinching and folding assembly 10. The to-be-folded area passing through the pinching and folding assembly 10 can then be located. At this point, the detection element 30 can control the movement of the web L and instruct the pinching and folding assembly 10 to perform the pinching operation on the to-be-folded area passing through it.

[0096] At this time, the pinching and folding assembly 10 is controlled by the detection member 30 to start the pinching and folding operation. The pinching and folding assembly 10 forms the pinching portion G on the material strip L with good position consistency, which helps to improve the lamination accuracy and product quality.

[0097] Secondly, referring to FIG. 4 , embodiments of the present application further provide a battery cell manufacturing apparatus 1000 . The battery cell manufacturing apparatus 1000 provided in embodiments of the present application can manufacture battery cells using a composite material strip 1 . The composite material strip 1 includes a diaphragm material strip 1B and a plurality of electrode sheet groups 1A spaced apart along the extending direction of the diaphragm material strip 1B. It is understood that each electrode sheet group 1A includes at least one electrode sheet, and the electrode sheets are stacked with the diaphragm material strip 1B in the thickness direction.

[0098] As an example (as shown in FIG5 ), the composite material strip 1 includes a diaphragm material strip 1B, and each pole piece group 1A includes a pole piece, the pole pieces between each two adjacent pole piece groups 1A are located on opposite sides of the diaphragm material strip 1B, and one of the pole pieces is a first pole piece A1, and the other pole piece is a second pole piece A2, and the first pole piece A1 and the second pole piece A2 have opposite polarity. As another example (as shown in FIG6 ), the composite material strip 1 includes two layers of diaphragm material strips 1B, and each pole piece group 1A includes a first pole piece A1 and a second pole piece A2, the first pole piece A1 is located on the outer layer of the composite material strip 1, and the second pole piece A2 is located between the two layers of diaphragm material strips 1B, and the first pole piece A1 between each two adjacent pole piece groups 1A is located on opposite sides of all diaphragm material strips 1B. Regarding the specific type of the composite material strip 1, those skilled in the art can make conventional settings.

[0099] Referring to Figure 4, the battery cell manufacturing device 1000 provided in an embodiment of the present application includes a stacking platform 400 and the pinching and folding mechanism 100 described in any of the above embodiments. The stacking platform 400 is located downstream of the pinching and folding mechanism 100. The pinching and folding mechanism 100 is used to perform a pinching operation on the composite material strip 1 to form a pinching portion G in the area of ​​the composite material strip 1 between two adjacent electrode groups 1A to output the laminated material strip 2, and the arching directions of each adjacent two pinching portions G in the laminated material strip 2 are opposite. The battery cell manufacturing device 1000 is capable of folding the laminated material strip 2 at each pinching portion G in turn and folding it on the stacking platform 400 to form a battery cell.

[0100] It can be understood that the region between adjacent electrode groups 1A in the composite material strip 1 (which can serve as the to-be-pinched region) is the separator material strip 1B. During cell fabrication, the pinching assembly 10 performs a pinching operation on the separator material strip 1B located between each adjacent electrode group 1A on the composite material strip 1. Specifically, regardless of the number of layers of separator material strip 1B, each pinching assembly 10 simultaneously pinches all layers of separator material strip 1B located in the to-be-pinched region, forming a pinched portion G comprised of at least one raised and pinched layer of separator material strip 1B.

[0101] In order to make the arching directions of the two adjacent pinching parts G in the laminated material strip 2 opposite, it can be achieved by using the method described in the above embodiment, for example, the first pinching component 10A and the second pinching component 10B are used to pinch each adjacent area to be pinched, and the details are not repeated here.

[0102] 4 , on the conveying path of the composite material strip 1, the composite material strip 1 first passes through the folding mechanism 100 to fold out the kneading portion G, and the folding mechanism 100 outputs the laminated material strip 2 with the kneading portion G, and then the battery cell making device 1000 bends the laminated material strip 2 in turn with each kneading portion G as the center, thereby causing the laminated material strip 2 to be Z-folded on the lamination platform 400 to form a battery cell.

[0103] After the pinching and folding mechanism 100 outputs the laminated material strip 2, the laminated material may be folded at each pinching portion G under the action of gravity, and then Z-folded on the stacking platform 400. Alternatively, the battery cell manufacturing device 1000 may include a swinging stacking mechanism, located downstream of the pinching and folding mechanism 100, for bending the laminated material strip 2 at each pinching portion G and swinging it back and forth laterally to fold the laminated material strip 2 in a Z-shape. Specifically, the swinging stacking mechanism may include a swinging stacking robot that can clamp the laminated material strip 2 and swing the laminated material strip 2 to fold it at the pinching portion G.

[0104] In practical application, the folding mechanism 100 of the battery cell manufacturing apparatus 1000 can fold the composite material strip 1 between two adjacent electrode assembly groups 1A to form a folding portion G, with each adjacent folding portion G arching in opposite directions, thereby producing a laminated material strip 2. Furthermore, the laminated material can be folded at each folding portion G, achieving a Z-shaped folding of the laminated material to produce a battery cell. The presence of the folding portion G ensures greater consistency in the folding angle position, resulting in higher accuracy and quality in the battery cell lamination.

[0105] In some embodiments, referring to FIG. 4 , the battery cell manufacturing apparatus 1000 further includes a feeding mechanism 300 and a thermal lamination mechanism 500 . The feeding mechanism 300 is configured to deliver the separator strip 1B and multiple electrode sets to the thermal lamination mechanism 500 . The thermal lamination mechanism 500 is configured to thermally laminate the separator strip 1B and the electrode sets to produce a composite strip 1 .

[0106] In composite strip 1, the electrode sheets of electrode assembly 1A and separator strip 1B are stacked. To ensure good contact and positional relationship between the electrode sheets and separator strip 1B, the electrode sheets and separator strips 1B are laminated together. At this point, cell manufacturing apparatus 1000 can laminate separator strip 1B with multiple electrode sheet groups to form composite strip 1.

[0107] Specifically, the feeding mechanism 300 conveys multiple sets of electrode sheets and the diaphragm material strip 1B that have not been combined together to the thermal bonding mechanism 500. The thermal bonding mechanism 500 then thermally bonds the diaphragm material strip 1B with each set of electrode sheets. Each set of electrode sheets bonded with the diaphragm material strip 1B is referred to as a electrode sheet group 1A. The feeding mechanism 300 may include a conveyor roller 301 that conveys the diaphragm material strip 1B along a conveying path. The feeding mechanism 300 may also include a electrode sheet placement robot that places each electrode sheet in the electrode sheet group 1A on the diaphragm material strip 1B or on the conveyor roller 301.

[0108] The thermal lamination mechanism 500 is used to thermally press the electrode assembly 1A and the diaphragm strip 1B. The specific structure of the thermal lamination mechanism 500 can be conventionally configured by those skilled in the art. For example, the thermal lamination mechanism 500 includes at least one pair of rollers 501 forming a rolling gap. The rollers 501 may be provided with a heating structure, enabling the rollers 501 to thermally laminate the electrode assembly 1A and the diaphragm strip 1B passing through the rolling gap. In other examples, the thermal lamination mechanism 500 may also include a hot press plate, which thermally presses the electrode assembly 1A and the diaphragm strip 1B together.

[0109] At this time, the battery cell manufacturing device 1000 can also thermally composite the electrode sheet and the diaphragm material strip 1B to form the composite material strip 1 , thereby completing the preparation of the composite material strip 1 .

[0110] 4 , the cell manufacturing apparatus 1000 further includes a cutter mechanism 200 located downstream of the pinching and folding mechanism 100 and upstream of the lamination platform 400. The cutter mechanism 200 includes a cutter portion 201 for cutting the laminated material strip 2.

[0111] The cutter unit 201 includes at least one cutter. The cutter is typically movable, capable of severing the laminated web 2 during movement. If the cutter unit 201 includes two cutters, the two cutters can be brought into close proximity to cut the web L. The cutter can also be a laser cutter, air knife, or other tool that does not require contact with the laminated web 2. The specific structure of the cutter unit 201 is not limited herein, and those skilled in the art may flexibly configure it.

[0112] In actual use, the pinching and folding mechanism 100 continuously outputs the laminated material strip 2, which is continuously folded to stack the electrode assembly 1A layer by layer. After a battery cell having N stacked electrode assemblies 1A is produced, the cutting mechanism 200 cuts the cell from the connected unfolded laminated material strip 2, separating the cell from the laminated material strip 2. In this way, the battery cell production apparatus 1000 can continuously produce multiple battery cells, greatly improving production efficiency.

[0113] Among them, the part cut by the cutting part 201 is usually the area between two adjacent electrode groups 1A. The cut end area can be pinched to form a pinching part G, or it can be arched to form an arched part g, or neither the arched part g nor the pinching part G can be formed.

[0114] In some embodiments, referring to FIG. 4 , the cutter mechanism 200 includes a heat sealing portion 202 , which is used to heat seal the cut ends of the laminated web 2 cut by the cutter portion 201 .

[0115] The heat-sealing unit 202 heat-presses the cut ends of the laminated web 2 to connect the layers of material at the cut ends. This creates a tight, secure connection between the layers, helping to maintain the structural stability of the laminated web 2. For example, the heat-sealing unit 202 includes a hot air blowing unit and a clamping plate. The hot air blowing unit blows hot air toward the cut ends to melt or soften the laminated web 2, while the clamping plate clamps the cut ends to press and soften the laminated web 2. The specific structure of the heat-sealing unit 202 can be configured conventionally by those skilled in the art.

[0116] At this time, the heat sealing portion 202 can heat seal the cut end of the laminated material strip 2 to improve the structural stability of the cut end of the laminated material strip 2.

[0117] In a third aspect, referring to FIG. 8 , an embodiment of the present application further provides a method for manufacturing a battery cell, comprising:

[0118] S10, providing a composite material strip 1, the composite material strip 1 comprising a diaphragm material strip 1B and a plurality of electrode assembly 1A spaced apart along an extending direction of the diaphragm material strip 1B;

[0119] S20, performing a pinching and folding operation on the composite material strip 1 to form a pinching portion G in the region of the composite material strip 1 between two adjacent electrode groups 1A to output a laminated material strip 2, wherein the arching directions of each two adjacent pinching portions G in the laminated material strip 2 are opposite;

[0120] S30 , folding the laminated material strip 2 at each kneading portion G in sequence to obtain a battery cell in which a plurality of electrode group 1A are stacked.

[0121] For the description of the composite material strip 1, please refer to the above description and will not be repeated here. In the composite material strip 1, the pole pieces of each pole piece group 1A are composited with the diaphragm material strip 1B.

[0122] The electrode groups 1A of the composite material strip 1 are spaced apart, and the area between adjacent electrode groups 1A is called a blank area, and the range of the blank area corresponds to the range of the area to be pinched and folded mentioned above. When executing step S20, all the blank areas on the composite material strip 1 can be pinched and folded to form a pinching portion G, or part of the blank areas on the composite material strip 1 can be pinched and folded to form a pinching portion G, and part of the blank areas are not pinched. For example, when it is necessary to cut the laminated material strip 2, the cutting area can be the unpinched blank area between two adjacent electrode groups 1A.

[0123] After performing the pinching and folding operation on the composite material strip 1, each laminated material strip 2 includes a plurality of pinching portions G spaced apart along its extending direction, and the area between adjacent pinching portions G is the area where the electrode group 1A is located.

[0124] In step S20, the composite material strip 1 can be transported to the pinching and folding mechanism 100 of the battery cell manufacturing device 1000. The pinching and folding mechanism 100 pinches and folds the composite material strip 1 to form multiple pinching portions G, and outputs a laminated material strip 2 having multiple pinching portions G and adjacent pinching portions G with opposite arching directions through the pinching and folding mechanism 100.

[0125] In step S30, the laminated strip 2 is laminated. Since the arching directions of each two adjacent kneading portions G in the laminated strip 2 are opposite, the laminated strip 2 can be folded at each kneading portion G, so that the laminated strip 2 is folded in a Z-shape, thereby obtaining a battery cell with a stacked electrode assembly 1A. Specifically, after the folding mechanism 100 outputs the laminated strip 2, the laminated strip 2 can be folded in a Z-shape at each kneading portion G under the action of gravity to form a battery cell. Alternatively, the laminated strip 2 can be folded in a Z-shape at each kneading portion G under the action of the swinging mechanism of the battery cell manufacturing device 1000 to form a battery cell.

[0126] In the above-mentioned method for making a battery cell, a kneading portion G is pinched and folded in the area of ​​the composite material strip 1 between adjacent electrode groups 1A to obtain a laminated material strip 2 having multiple kneading portions G and adjacent kneading portions G with opposite arching directions. In the process of Z-shaped folding of the laminated material strip 2 to obtain a battery cell, the folding angle position of the battery cell is relatively consistent, the lamination accuracy is high, and the battery cell quality is better.

[0127] In some embodiments, referring to FIG. 9 , step S10 of providing the composite tape 1 includes:

[0128] S11, providing a diaphragm strip 1B and a plurality of electrode groups spaced apart along an extending direction of the diaphragm strip 1B;

[0129] S12 , thermally compounding each set of electrode pieces on the diaphragm strip 1B to obtain a composite strip 1 .

[0130] In step S11, the membrane strip 1B and the electrode groups may be conveyed by the feeding mechanism 300. For example, the membrane strip 1B is guided by the conveying rollers 301 of the feeding mechanism 300, and the electrode placement robot of the feeding mechanism 300 stacks the electrode groups on the membrane strip 1B.

[0131] In step S12, the diaphragm strip 1B and the electrode groups can be thermally laminated using a thermal lamination mechanism 500. Specifically, the thermal lamination mechanism 500 includes a pressing roller 501 located downstream of the conveyor roller 301. The two pressing rollers 501 are spaced apart to form a rolling gap, through which the diaphragm strip 1B can pass. When the diaphragm strip 1B and the electrode groups pass through the rolling gap, they are thermally pressed together by the pressing rollers 501.

[0132] In this way, the electrode and the diaphragm strip 1B can be well composited into a composite strip 1 .

[0133] In some embodiments, referring to FIG. 9 , after step S30 of folding the laminated strip 2 at each kneading portion G to obtain a battery cell in which a plurality of electrode groups 1A are stacked, the method further includes:

[0134] S40, cutting off the connection between the unfolded laminated material strip 2 and the battery cell;

[0135] Specifically, the pinching and folding mechanism 100 continuously outputs the laminated material strip 2, and the laminated material strip 2 is continuously folded, so that the electrode group 1A is stacked layer by layer. After preparing a battery cell with N stacked electrode groups 1A, the cutting mechanism 200 cuts the battery cell and the connected unfolded laminated material strip 2, so that the battery cell and the laminated material strip 2 are separated. Specifically, the battery cell and the unfolded laminated material strip 2 are connected by a blank area, and the cutting mechanism 200 can cut the blank area. The diaphragm material strip in the blank area can form an arched portion, a pinched portion, or neither an arched portion nor a pinched portion.

[0136] S50 , heat-sealing the cut ends of the unfolded laminated material strip 2 .

[0137] After the cutter unit 201 cuts the laminated material strip 2, the cut end cut by the cutter unit 201 can be heat-sealed by the heat-sealing unit 202 of the cutter mechanism 200. Specifically, the hot air knife of the heat-sealing unit 202 can be used to heat and pressurize the cut end of the laminated material strip 2, thereby heating and pressurizing the cut end of the laminated material strip 2 so that the diaphragm material strip 1B at the cut end softens and fuses together, thereby achieving heat sealing of the cut end.

[0138] In this way, multiple battery cells can be produced on the same production line, with higher production efficiency.

[0139] In a further embodiment, after step S40, the process may further include S60: sequentially removing the prepared battery cells from the stacking platform 400. Typically, one battery cell is folded at a time on the stacking platform 400. The battery cells may be removed from the stacking platform 400 using a tool such as a robot.

[0140] Fourthly, referring to FIG. 7 , an embodiment of the present application further provides a laminated material strip 2 comprising a diaphragm material strip 1B and a plurality of electrode sheet groups 1A spaced apart along the extension direction of the diaphragm material strip 1B, wherein the electrode sheets of each electrode sheet group 1A are stacked on the diaphragm material strip 1B. The region of the laminated material strip 2 between two adjacent electrode sheet groups 1A is arched and kneaded along the thickness direction of the laminated material strip 2 to form kneaded portions G spaced apart along the extension direction of the laminated material strip L, with adjacent kneaded portions G having opposite arching directions.

[0141] Separator strip 1B refers to a strip of material formed from a separator. A crucial component of battery cell manufacturing, the separator separates the positive and negative electrodes, preventing internal short circuits in the cell while allowing the free passage of electrolyte ions to complete the electrochemical charge and discharge process. Its performance determines the battery's interface structure and internal resistance, directly impacting its capacity, cycle performance, and safety. Separators can be made of polyethylene, polypropylene, polyimide, and other materials, with conventional selections possible.

[0142] The electrode group 1A includes at least one electrode. When the electrode group 1A includes only one electrode, the diaphragm strip 1B includes only one layer, the electrode plates of adjacent electrode groups 1A have opposite polarities and are arranged on opposite sides of the diaphragm strip 1B. When the electrode group 1A includes two electrode plates (a first electrode plate A1 and a second electrode plate A2 with different polarities, the first electrode plate A1 is one of the positive electrode plate and the negative electrode plate, and the second electrode plate A2 is the other of the positive electrode plate and the negative electrode plate), the diaphragm strip 1B may include two layers, and each electrode group 1A includes a second electrode plate A2 located between the two layers of diaphragm strip 1B, and the first electrode plate A1 is arranged on the outer layer, and the first electrode plates A1 of adjacent electrode groups 1A are arranged on different sides of the laminated strip 2. Regarding the specific structure of each electrode, those skilled in the art can make conventional choices.

[0143] It is possible, but not limited to, that in the laminated material strip 2, at least a plurality of adjacent electrode groups 1A include a first electrode A1 located on the outer layer of the laminated material strip 2, and the first electrode sheets A1 of adjacent electrode groups 1A are arranged on opposite sides in the thickness direction of the laminated material strip 2. In this way, in the battery cell obtained by folding, the diaphragm, the first electrode sheet A1, the diaphragm, and the second electrode sheet A2 are arranged in sequence. Among them, for the electrode group 1A arranged at the bottom of the battery cell after folding, it may not include the first electrode sheet A1 located on the outer layer of the laminated material strip 2. In this way, when stacking, there is no need to consider that the electrode of the bottom electrode group 1A is scraped by the stacking platform 400, causing the undesirable phenomenon of powder falling off the battery cell. Of course, it is possible to consider laying a protective pad on the stacking platform 400, and the laminated material strip 2 is folded on the protective pad, and the protective pad is used to protect the first electrode sheet A1 located on the outer layer of the bottom electrode group 1A from being scraped.

[0144] The number of pole pieces in each pole piece group 1A and the number of layers of the diaphragm material strip 1B can be set according to conventional settings, as long as they can be formed into a battery cell through Z-shaped folding.

[0145] The above-mentioned laminated material strip 2 has a pinching portion G formed by pinching the area between two adjacent electrode groups 1A, and the arching directions of adjacent pinching portions G are opposite. When folded in a Z shape, it can be folded smoothly and quickly at each pinching portion G to obtain battery cells with basically consistent folding angle positions, which is beneficial to improving the stacking efficiency of the battery cells and improving the quality of the battery cells.

[0146] In some embodiments, as shown in FIG7 , the diaphragm strip 1B includes two layers, the electrode group 1A includes a first electrode piece A1 and a second electrode piece A2, the second electrode piece A2 is arranged between the two layers of the diaphragm strip 1B, and the first electrode piece A1 is arranged on the outer layer of the laminated strip 2. The first electrode pieces A1 of adjacent electrode groups 1A are located on opposite sides of the laminated strip 2, and the entire diaphragm strip 1B between two adjacent electrode groups 1A is arched and kneaded to form the kneaded portion G. In this case, the kneaded portion G between the two adjacent electrode groups 1A is formed by the two layers of the diaphragm strip 1B, and the kneaded portion G has higher strength.

[0147] In some embodiments, the membrane strips 1B forming the kneading portion G are adhered to each other. Specifically, the heating element 20 can be used to heat the pinching and folding assembly 10 during the pinching and folding operation, so that the membrane strips 1B in the kneading portion G are pressed together by heat, thereby achieving a better shaping effect of the kneading portion G formed by the membrane strips 1B during the lamination process, thereby improving the lamination accuracy.

[0148] In a fifth aspect, an embodiment of the present application further provides a battery core, which is formed by folding the laminated strip 2 of the above embodiment in sequence at each kneading portion G. It has all the above-mentioned beneficial effects.

[0149] The folding mechanism 100, the battery cell manufacturing device 1000, the battery cell manufacturing method, the laminated material strip 2 and the battery cells provided in the embodiments of the present application can utilize the folding components 10 in the folding mechanism 100 to fold out the folding corners of the laminated material strip 2 to form a folding portion G when producing battery cells. When stacking, the laminated material strip 2 can be folded in turn at each folding portion G, and the folding corners of the laminated material strip 2 can be accurately located using the folding portion G, which helps to improve the stacking accuracy of the laminated material strip 2 and improve the quality of the battery cells.

[0150] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0151] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A pinching and folding mechanism (100), It is characterized in that include: At least one pinching and folding assembly (10) is arranged on a conveying path of a material belt (L), and each of the pinching and folding assemblies (10) is used to perform a pinching and folding operation on the material belt (L) located on the conveying path, wherein the pinching and folding operation includes forming an arched portion (g) on ​​the material belt (L) that is arched along a thickness direction (X) of the material belt (L), and pinching the arched portion (g) to form a pinching portion (G) on the material belt (L).

2. The pinching and folding mechanism (100) according to claim 1, It is characterized in that The pinching and folding assembly (10) comprises an arch belt member (11) and a kneading member (12), wherein the kneading member (12) forms a kneading space (N); The belt arch member (11) is used to allow the material belt (L) located in the conveying path to enter the kneading space (N) and form the arched portion (g), and the kneading member (12) is used to knead the arched portion (g) located in the kneading space (N) to form the kneading portion (G).

3. The pinching and folding mechanism (100) according to claim 2, It is characterized in that The belt arch member (11) is movably arranged, and during the movement, the material belt (L) located on the conveying path can enter the kneading space (N) to form the arched portion (g); The kneading element (12) comprises two kneading sub-elements (12c) arranged at an interval, wherein the kneading space (N) is formed between the two kneading sub-elements (12c), and the two kneading sub-elements (12c) are capable of relative movement, and the size of the kneading space (N) can be adjusted during the movement to knead the arched portion (g) located in the kneading space (N).

4. The pinching and folding mechanism (100) according to claim 3, It is characterized in that The belt arch member (11) comprises a belt arch pressure rod, which is movably arranged and can push the material belt (L) located in the conveying path into the kneading space (N) to form the arched portion (g) during the movement.

5. The pinching and folding mechanism (100) according to claim 1, It is characterized in that The pinching and folding component (10) comprises a heating element (20), wherein the heating element (20) is arranged on the pinching and folding component (10) and is used to heat the pinching and folding component (10) when the pinching and folding component (10) performs the pinching operation.

6. The pinching and folding mechanism (100) according to any one of claims 1 to 5, It is characterized in that All the pinching and folding components (10) are used to form a plurality of pinching portions (G) on the material strip (L) which are arranged at intervals along the extension direction of the material strip (L), and the arching directions of every two adjacent pinching portions (G) are opposite.

7. The pinching and folding mechanism (100) according to claim 6, It is characterized in that The at least one pinching and folding assembly (10) comprises a first pinching and folding assembly (10A) and a second pinching and folding assembly (10B) arranged at intervals along the conveying path, and the pinching portions (G) formed by the first and second pinching and folding assemblies on the material belt (L) have arching directions opposite to each other.

8. The pinching and folding mechanism (100) according to any one of claims 1 to 5, It is characterized in that The pinching and folding mechanism (100) further comprises a detection member (30), wherein the detection member (30) is used to obtain characteristic information of the material belt (L) located on the conveying path, and locate the area to be pinched and folded of the material belt (L) according to the characteristic information, and the pinching and folding component (10) is used to perform the pinching and folding operation on the located area to be pinched and folded.

9. A battery cell manufacturing device (1000), It is characterized in that The battery cell manufacturing device (1000) can manufacture battery cells using a composite material strip (1), wherein the composite material strip (1) comprises a diaphragm material strip (1B) and a plurality of electrode sheet groups (1A) arranged at intervals along an extension direction of the diaphragm material strip (1B); The battery cell manufacturing device (1000) comprises a stacking platform (400) and a pinching and folding mechanism (100) according to any one of claims 1 to 8; the stacking platform (400) is located downstream of the pinching and folding mechanism (100); The pinching and folding mechanism (100) is used to perform a pinching operation on the composite material strip (1) to form the pinching portion (G) in the region of the composite material strip (1) between two adjacent electrode groups (1A) to output the laminated material strip (2), and the arching directions of two adjacent pinching portions (G) in the laminated material strip (2) are opposite; The battery cell manufacturing device (1000) can fold the laminated material strip (2) in sequence at each of the kneading parts (G), and fold it on the laminated platform (400) to form a battery cell.

10. The battery cell manufacturing device (1000) according to claim 9, It is characterized in that The battery cell manufacturing device (1000) further comprises a feeding mechanism (300) and a thermal compounding mechanism (500); The feeding mechanism (300) is used to feed the diaphragm material strip (1B) and multiple groups of pole pieces to the thermal composite mechanism (500); The thermal composite mechanism (500) is used to thermally composite the diaphragm material strip (1B) and each group of the pole pieces to output the composite material strip (1).

11. The battery cell manufacturing device (1000) according to claim 9, It is characterized in that The battery cell manufacturing device (1000) further comprises a cutting mechanism (200), wherein the cutting mechanism (200) is located downstream of the pinching and folding mechanism (100) and arranged upstream of the lamination platform (400); The cutter mechanism (200) comprises a cutter portion (201) for cutting the laminated material strip (2).

12. The battery cell manufacturing device (1000) according to claim 11, It is characterized in that The cutting mechanism (200) further comprises a heat sealing portion (202), wherein the heat sealing portion (202) is used to heat seal the cut end of the laminated material strip (2) cut off by the cutting portion (201).

13. A method for manufacturing a battery cell, It is characterized in that include: A composite material strip (1) is provided; the composite material strip (1) comprises a diaphragm material strip (1B) and a plurality of pole piece groups (1A) arranged at intervals along an extension direction of the diaphragm material strip (1B); Performing a kneading operation on the composite material strip (1) to form a kneading portion (G) in a region of the composite material strip (1) between two adjacent electrode groups (1A) to output a laminated material strip (2), wherein the arching directions of each two adjacent kneading portions (G) in the laminated material strip (2) are opposite; The laminated material strip (2) is folded in sequence at each of the kneading portions (G) to obtain a battery cell in which a plurality of the electrode sheet groups (1A) are stacked.

14. The method for manufacturing a battery cell according to claim 13, It is characterized in that The step of providing a composite material strip (1) comprises: Providing a diaphragm material strip (1B) and a plurality of groups of pole pieces arranged at intervals along the extension direction of the diaphragm material strip (1B); Each group of pole pieces is thermally composited onto the diaphragm material strip (1B) to obtain the composite material strip (1).

15. The method for manufacturing a battery cell according to claim 13, It is characterized in that After the laminated material strip (2) is folded in sequence at each of the kneading parts (G) to obtain a battery cell in which a plurality of the electrode groups (1A) are stacked, the method comprises: Cutting off the connection between the unfolded laminated material strip (2) and the battery core; The cut ends of the unfolded laminated web (2) are heat sealed.

16. A laminated material strip (2), It is characterized in that It comprises a diaphragm material strip (1B) and a plurality of pole piece groups (1A) arranged at intervals along the extension direction of the diaphragm material strip (1B), wherein the pole pieces of each pole piece group (1A) are stacked with the diaphragm material strip (1B); The area of ​​the laminated material strip (2) located between two adjacent pole piece groups (1A) is arched and pinched along the thickness direction of the laminated material strip (2) to form a plurality of pinching portions (G) arranged at intervals along the extension direction of the laminated material strip (2), and the arching directions of adjacent pinching portions (G) are opposite.

17. The laminated strip (2) according to claim 16, It is characterized in that The diaphragm material strip (1B) comprises two layers, the electrode group (1A) comprises a first electrode piece (A1) and a second electrode piece (A2), the second electrode piece (A2) is arranged between the two layers of the diaphragm material strip (1B), the first electrode piece (A1) is arranged on the outer layer of the laminated material strip (2), and the first electrode pieces (A1) of adjacent electrode groups (1A) are located on opposite sides of the laminated material strip (2); All of the diaphragm material strips (1B) located between two adjacent pole piece groups (1A) are arched and kneaded to form the kneading portion (G).

18. The laminated strip (2) according to claim 16, It is characterized in that The separator strips (1B) forming the kneading portion (G) are adhered to each other.

19. A battery cell, It is characterized in that The battery core is formed by folding the laminated material strip (2) as described in any one of claims 16 to 18 in sequence at each of the kneading parts (G).

Images