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

Abstract

The present application relates to a pinching and folding mechanism, a battery cell manufacturing device, a laminated material strip and a battery cell. The pinching and folding mechanism comprises a pinching and folding assembly, the pinching and folding assembly comprising a pickup member and a pinching member, wherein a pinching space is formed in the pinching member; and the pickup member has a pickup end, and the pickup end is movably arranged relative to the pinching member in a first direction. The pickup end can enter and retreat from the pinching space during movement, and the pinching member can change the size of the pinching space in a second direction intersecting the first direction, such that the pinching and folding assembly performs a pinching and folding operation. In the technical solution of the present application, as pinched portions are machined on a material strip, fold positions can be accurately positioned during a lamination process by means of the pinched portions, and the fold positions can have high position consistency, such that the lamination precision of the material strip can be improved, and then the product quality is improved. (FIG. 1)

Description

Folding mechanism, cell making device, laminated strip and 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 202323110413.9 and titled “Pinching mechanism, battery cell manufacturing device, 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 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 cell making device, a stacking material strip and a cell to address the problem that the battery stacking accuracy is not high and affects the quality of the cell.

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

[0007] The pinching and folding assembly includes a picking member and a kneading member, wherein the kneading member forms a kneading space, and the picking member has a picking end, wherein the picking end is movably arranged relative to the kneading member along a first direction;

[0008] The picking end can move forward and backward in the kneading space during movement, and the kneading member can change the size of the kneading space in a second direction intersecting with the first direction, so that the pinching and folding component performs a pinching and folding operation.

[0009] In some embodiments, the kneading element has a feed end, and the kneading space is set through the feed end; the picking end enters and exits the kneading space through the feed end, and the picking end exiting the kneading space is opposite to the feed end and spaced apart.

[0010] In some embodiments, the kneading element includes two kneading sub-elements, and the two kneading sub-elements are spaced apart in the second direction to form the kneading space, and can move relative to each other to change the size of the kneading space.

[0011] In some embodiments, the pinching mechanism includes a first pinching component and a second pinching component, the kneading elements of the first pinching component and the second pinching component are staggered in the second direction, and the feed ends of the kneading elements of the two are spaced apart and arranged facing each other in the first direction along the orthographic projection of the second direction.

[0012] In some embodiments, the pinching and folding mechanism further includes a heating element, and the heating element is disposed on the picking element and / or the kneading element.

[0013] In some embodiments, the pinching mechanism further includes a detection element, which is used to obtain characteristic information of the material strip and locate the area to be pinched and folded on the material strip based on the characteristic information. The pinching component is used to perform a pinching operation on the area to be pinched and folded on the material strip.

[0014] In a second aspect, an embodiment of the present application provides a battery cell manufacturing device, comprising a stacking platform and a pinching mechanism as described in any of the above embodiments, wherein the stacking platform is located downstream of the pinching mechanism; the pinching mechanism is configured to perform a pinching operation on a material strip to form an arched and pinched pinching portion on the material strip to output a stacked material strip, wherein the plurality of pinching portions are arranged at intervals in an extension direction of the stacked material strip;

[0015] The battery core forming device can fold the laminated material strips in sequence at each of the kneading parts to form battery cores on the laminated platform.

[0016] In some embodiments, the battery cell manufacturing device further includes a feeding mechanism and a thermal composite mechanism; the thermal composite mechanism is located upstream of the pinching and folding mechanism;

[0017] The feeding mechanism is used to convey the diaphragm material strip and multiple sets of electrode sheets to the thermal bonding mechanism, and the thermal bonding mechanism is used to thermally bond the multiple sets of electrode sheets to the diaphragm material strip to output a composite material strip including the diaphragm material strip and multiple electrode sheet groups spaced apart along the extension direction of the diaphragm material strip;

[0018] The pinching and folding mechanism is used to form the pinching portion in the diaphragm material strip region between two adjacent electrode groups of the composite material strip to output the laminated material strip.

[0019] 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;

[0020] The cutter mechanism includes a cutter portion for cutting the laminated material strip.

[0021] 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 after being cut by the cutter portion.

[0022] In a third aspect, an embodiment of the present application further provides a laminated material strip, which includes a diaphragm material strip, and the laminated material strip has a plurality of kneading parts spaced apart in its extension direction, each of the kneading parts being formed by the diaphragm material strip being arched and kneaded along the thickness direction of the laminated material strip.

[0023] In some embodiments, the laminated material strip further comprises a plurality of electrode groups spaced apart along an extension direction of the diaphragm material strip, and the electrode of each electrode group is stacked with the diaphragm material strip;

[0024] The diaphragm material strip region of the laminated material strip located between two adjacent pole piece groups is arched along the thickness direction of the laminated material strip and is kneaded to form the kneading portion.

[0025] In some embodiments, the diaphragm material strip includes two layers, the electrode group includes a first electrode piece and a second electrode piece, the second electrode piece is arranged between the two layers of the diaphragm material strip, the first electrode piece is arranged on the outer layer of the laminated material strip, and the first electrode pieces of adjacent electrode groups are located on opposite sides of the laminated material strip;

[0026] All the diaphragm material strips located between two adjacent electrode groups are arched and kneaded to form the kneading portion.

[0027] In some embodiments, the separator strips forming the kneading portion are adhered to each other.

[0028] In a fourth aspect, an embodiment of the present application further provides a battery cell, which includes a structure formed by folding the laminated material strip as described in any one of the above items at each of the kneading parts in sequence.

[0029] The above-mentioned pinching and folding mechanism, battery cell making device, 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

[0030] 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:

[0031] FIG1 is a schematic structural diagram of a pinching and folding mechanism according to some embodiments of the present application.

[0032] FIG2 is a schematic diagram of the structure of a folded material strip according to some embodiments of the present application.

[0033] FIG3 is a schematic diagram of the pinching and folding process of the pinching and folding assembly in some embodiments of the present application.

[0034] FIG4 is a system schematic diagram of a battery cell manufacturing device according to some embodiments of the present application.

[0035] FIG5 is a schematic diagram of the structure of a composite material strip according to some embodiments of the present application.

[0036] FIG6 is a schematic structural diagram of composite material strips according to other embodiments of the present application.

[0037] FIG7 is a schematic diagram of the structure of the laminated material strips according to some embodiments of the present application. 1000, battery cell manufacturing device; 100, pinching and folding mechanism; X, first direction; Y, second direction; 10, pinching and folding assembly; 10A, first pinching and folding assembly; 10B, second pinching and folding assembly; 11, picking piece; 11a, picking end; 12, kneading piece; 12b, feeding end; N, kneading space; 12c, kneading sub-piece; 20, heating element; 30, detecting element; 200, cutting mechanism; 201, cutting part; 202, heat sealing part; 300, feeding mechanism; 301, conveying roller; 400, lamination platform; 500, thermal composite assembly; 501, pressing roller; L, material strip; 1, composite material strip; 2, lamination material strip; g, arched part; G, kneading part; 1A, electrode group; A1, first electrode; A2, second electrode; 1B, diaphragm material strip. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The preparation of laminated lithium batteries usually adopts a "Z"-shaped lamination. During lamination, the corner between adjacent lamination units is called the folding position. At present, the folding position is 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 position between each lamination unit to 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 a folding portion on the material strip to be folded before the lamination operation. During the lamination process, the pinching and folding portion can be accurately positioned to form a folding position, which helps to improve the lamination accuracy and battery quality.

[0045] The pinching and folding mechanism proposed in the embodiments of the present application can be applied to a battery manufacturing apparatus. The battery manufacturing apparatus is used to produce laminated products. The laminated products may be, but are not limited to, bare cells formed by stacking negative electrode sheets, positive electrode sheets, and separator strips. The pinching and folding mechanism is used to pinch and fold the strips to be folded at the corresponding locations before the lamination operation to form a pinched portion. This pinched portion can be precisely positioned to form a folded corner.

[0046] The pinching and folding mechanism proposed in the first aspect of the embodiment of the present application is described in detail below.

[0047] Figure 1 is a schematic diagram of the structure of a pinching and folding mechanism in some embodiments of the present application. Figure 2 is a schematic diagram of the structure of a pinched and folded material strip L in some embodiments of the present application. Figure 3 is a schematic diagram of the pinching and folding process of a pinching mechanism in some embodiments of the present application.

[0048] According to some embodiments of the present application, referring to FIG. 1 , a pinching and folding mechanism 100 provided in an embodiment of the present application includes a pinching and folding assembly 10, which includes a picking member 11 and a kneading member 12. The kneading member 12 defines a kneading space N. The picking member 11 has a picking end 11a, which is movable relative to the kneading member 12 along a first direction X. The picking end 11a can move forward and backward within the kneading space N during movement, and the kneading member 12 can change the size of the kneading space N in a second direction Y intersecting the first direction X, thereby enabling the pinching and folding assembly 10 to perform a pinching operation.

[0049] Typically, the pinching and folding assembly 10 includes a pinching and folding station. When the web L is located at the pinching and folding station, the pinching and folding assembly 10 performs a pinching and folding operation on the web L through the cooperation of its picking element 11 and pinching element 12. In practical applications, the web L may travel in the second direction Y, with its thickness direction corresponding to the first direction X.

[0050] The picking member 11 is used to pick up the material strip L in the pinching and folding station, and feed the material strip L into the kneading space N of the kneading member 12 along the first direction X, so that the material strip L is arched and a raised portion g is formed on the material strip L (see Figure 3). The kneading member 12 can change the size of its kneading space N in the second direction Y to knead the arched material strip L (i.e., the raised portion g) in the kneading space N to obtain the kneading portion G (see Figures 2 and 3). It can be seen that the pinching and folding component 10 performs a pinching operation in two steps. The first step is to form the raised portion g on the material strip L by the picking member 11, and the second step is to use the kneading member 12 to knead the raised portion g to obtain the kneading portion G. This process is the process of the pinching and folding component 10 performing the pinching and folding operation. It should be noted that the first and second steps can be performed simultaneously or one after another.

[0051] The picking member 11 picks up the material strip L via its picking end 11a. The picking end 11a can pick up the material strip L by suction, clamping, or supporting, as long as the material strip L can be delivered to the kneading space N. The picking end 11a is movable relative to the kneading member 12 in the first direction X. Specifically, the picking member 11 can move in the first direction X as a whole, or the picking end 11a can serve as a telescopic end of the picking member 11, with the picking member 11 moving during the telescopic process. The specific method for achieving movement of the picking end 11a is not limited to the above method, and those skilled in the art can make conventional arrangements.

[0052] The kneading element 12 is configured to vary the size of its kneading space N in the second direction Y to knead the arched material web L (i.e., the arched portion g) within the kneading space N. The kneading element 12 can be configured in a variety of ways. For example, the kneading element 12 includes two airbag elements, forming a kneading space N between the two airbag elements. The size of the kneading space N can be adjusted by varying the inflation level of the airbag elements.

[0053] For explanation, the material strip L fed into the kneading space N by the pickup end 11a includes multiple sections that are sequentially bent and connected. These sections can be connected in a V-shape, a W-shape, a U-shape, or other shapes. The kneading member can knead the material strip L within the kneading space N when changing the size of the kneading space N. That is, the multiple sections of the material strip L are pressed together along the direction of the bend (which can be, but is not limited to, a direction substantially parallel to the second direction Y). For example, the arched material strip L1 in a V-shape, a W-shape, a U-shape, or other shapes can be pressed together to form an I-shape structure, thereby forming a kneading portion G on the material strip L.

[0054] As shown in Figure 2, the kneading portion G formed by the kneading mechanism 100 is arranged to protrude in the first direction X. In practical applications, the kneading portion G can be formed on the material strip L using the kneading mechanism 100, and the material strip L can then be continuously folded around the kneading portion G to obtain a laminated product. In this case, since the kneading portion G is formed on the material strip L, the kneading portion G can be used to accurately locate the folding angle during the lamination process, resulting in a high degree of positional consistency between the folding angles, improving the lamination accuracy of the material strip L and, consequently, improving product quality.

[0055] In some embodiments, referring to FIG. 3 , the kneading element 12 has a feed end 12 b , a kneading space N extending through the feed end 12 b , and a pickup end 11 a delivers the material strip L into the kneading space N via the feed end 12 b . The pickup end 11 a advances and retreats from the kneading space N via the feed end 12 b , and the pickup end 11 a exiting the kneading space N is spaced opposite and spaced from the feed end 12 b .

[0056] The feed end 12b is the end of the kneading element 12 in the first direction X and is connected to the kneading space N. The pickup end 11a delivers the picked-up material L into the kneading space N through the feed end 12b, and the pickup end 11a itself enters and exits the kneading space N through the feed end 12b. When the pickup end 11a exits the kneading space N, the pickup end 11a and the feed end 12b are positioned opposite each other in the first direction X, with a gap between them.

[0057] In actual application, as shown in state a in Figure 3, the picking end 11a exits the feeding end 12b, and a space is formed between the picking end 11a and the feeding end 12b; referring to state b, there is a material strip L in the space, the picking end 11a moves toward the feeding end 12b, and pushes the material strip L into the kneading space N, thereby forming an arched portion g on the material strip L located in the kneading space N; referring to state c, the picking end 11a exits the kneading space N through the feeding end 12b; referring to state d, the kneading piece 12 changes the size of the kneading space N, and kneads the arched portion g located in the kneading space N, and finally obtains the kneading portion G on the material strip L.

[0058] At this time, the round trip travel of the picking end 11a in the first direction X is shorter, and the material strip L can be sent into the kneading space N by pushing. There is no need to set other structures for clamping / absorbing the material strip L on the picking end 11a, which can reduce the cost of the picking part 11.

[0059] Of course, in other embodiments, a clamping / adsorption structure may also be provided on the pickup end 11a. Furthermore, the pickup end 11a exiting the kneading space N may also be disposed at the end of the kneading element 12 facing away from the feed end 12b, as long as the material strip L can be arched into the kneading space N.

[0060] 3 , the kneading element 12 includes two kneading sub-elements 12 c , which are spaced apart in the second direction Y to form a kneading space N and can move relative to each other to change the size of the kneading space N.

[0061] The kneading sub-elements 12c can be in the form of plates, blocks, or the like. The two kneading sub-elements 12c can move closer to or farther from each other in the second direction Y to change the size of the kneading space N formed therebetween. Specifically, one of the two kneading sub-elements 12c can be fixed while the other is movable in the second direction Y, or both can be movable in the second direction Y. The movement of the kneading sub-elements 12c can be achieved by a drive such as a telescopic cylinder or a linear motor.

[0062] In actual application, the two kneading sub-elements 12c first move away from each other to the position where the kneading space N is the largest. When the arched material strip L (i.e., the arched portion g) enters the kneading space N, the two kneading sub-elements 12c approach each other and reduce the size of the kneading space N until the arched portion g is kneaded together.

[0063] At this time, the pinching and folding member has a simple structure and is easy to implement.

[0064] In some embodiments, referring to FIG. 1 , the pinching mechanism 100 includes a first pinching component 10A and a second pinching component 10B, wherein the pinching elements 12 of the two pinching components are spaced apart and arranged facing each other in the second direction Y, and the feed ends 12b of the two pinching components 12 are spaced apart and arranged facing each other in the first direction X along the orthographic projection of the second direction Y.

[0065] There are at least two pinching and folding assemblies 10, one of which is a first pinching and folding assembly 10A, and the other is a second pinching and folding assembly 10B. Each pinching and folding assembly 10 has a pinching element 12 and a picking element 11, and each pinching and folding assembly 10 can perform a pinching and folding operation on the material web L using its own pinching element 12 and picking element 11.

[0066] The kneading elements 12 of the first pinching and folding assembly 10A and the kneading elements 12 of the second pinching and folding assembly 10B are arranged at intervals in the second direction Y, and can perform pinching and folding operations on different parts of the material strip L in the extending direction to form a plurality of kneading portions G on the material strip L.

[0067] In the orthographic projection of the kneading elements 12 of the first pinching and folding assembly 10A and the kneading elements 12 of the second pinching and folding assembly 10B along the second direction Y, the feed ends 12b of the two kneading elements 12 are spaced apart in the first direction X and arranged facing each other. In this manner, a space for the feed belt L to run is formed between the two feed ends 12b spaced apart in the first direction X. The kneading elements 12 of the first pinching and folding assembly 10A are arranged on one side of the material belt L in the thickness direction (i.e., the first direction X), while the kneading elements 12 of the second pinching and folding assembly 10B are arranged on the other side of the material belt L in the thickness direction.

[0068] In this way, different portions of the web L can be arched into the folding spaces of the corresponding pinching and folding assemblies 10 toward different sides in the first direction X, forming pinching portions G with different arching directions. In actual use, the first pinching and folding assembly 10A and the second pinching and folding assembly 10B can form multiple spaced pinching portions G on the web L, with each adjacent pinching portion G arching in opposite directions.

[0069] During Z-shaped lamination, the folding directions of the kneading parts GG are roughly opposite. At this time, the first folding assembly 10A and the second folding assembly 10B fold the kneading parts G with different arching directions on the material strip L, which makes lamination easier.

[0070] In some embodiments, referring to FIG. 3 , the pinching and folding mechanism 100 further includes a heating element 20 , which is disposed on the picking element 11 and / or the kneading element 12 .

[0071] The heating element 20 can be a heating wire, a heating plate, etc., and the specific type is not limited, as long as it can generate heat. The heating element 20 can be embedded in the picking element 11 and / or the kneading element 12 or fixed to the surface of the picking element 11 and / or the kneading element 12. The arrangement position of the heating element 20 is not limited.

[0072] In actual application, when the picking member 11 and the kneading member 12 cooperate to perform the pinching and folding operation, the heating member 20 is started, and the picking member 11 and / or the kneading member 12 are heated by the heating member 20, so as to heat the material strip L in the process of the picking member 11 pulling the material strip L into the kneading space N to form the arched portion g, and / or heat the arched portion g in the process of the kneading member 12 kneading the arched portion g, so that the kneading effect of each part of the kneading portion G after kneading is more firm, and the shaping effect of the kneading portion G is better.

[0073] In some embodiments, please refer to Figure 1, the pinching mechanism 100 also includes a detection part 30, which is used to obtain characteristic information of the material strip L and locate the area to be pinched and folded on the material strip L according to the characteristic information. The pinching component 10 is used to perform a pinching operation on the area to be pinched and folded on the material strip L.

[0074] The detection member 30 and the pinching and folding assembly 10 are both arranged on the conveying path of the material strip L. The detection member 30 can be arranged upstream or downstream of the pinching and folding assembly 10. In the embodiment shown in FIG1 , the detection member 30 is arranged upstream of the pinching and folding assembly 10.

[0075] 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.

[0076] If the characteristic information acquired by the detection element 30 includes one of the areas to be pinched and folded on the material strip L, it indicates that another area to be pinched and folded on the material strip L is passing through the pinching and folding assembly 10, and the area to be pinched and folded passing through the pinching and folding assembly 10 is located. At this point, the detection element 30 can control the movement of the material strip L and instruct the pinching and folding assembly 10 to perform the pinching operation on the area to be pinched and folded passing through the pinching and folding assembly 10.

[0077] 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.

[0078] In a specific embodiment of the present application, the pinching and folding assembly 10 includes a first pinching and folding assembly 10A and a second pinching and folding assembly 10B. Both the first pinching and folding assembly 10A and the second pinching and folding assembly 10B include a picking member 11 and a kneading member 12. The picking member 11 is movable in a first direction X. The kneading member 12 has a kneading space N whose size can be changed in a second direction Y. The picking member 11 and a feed end 12b of the kneading member 12 are arranged opposite and spaced apart in the first direction X. The feed ends 12b of the kneading members 12 of the first pinching and folding assembly 10A and the second pinching and folding assembly 10B are spaced apart in the first direction X to form a space for a feed belt L to run.

[0079] In actual use, the picking members 11 of the first pinching and folding assembly 10A and the second pinching and folding assembly 10B move in opposite directions along the first direction X, pushing different portions of the web L into their corresponding kneading spaces N, forming arched portions g with opposite arching directions. The kneading members 12 of the two pinching and folding assemblies 10 then knead the arched portions g within their respective kneading spaces N to form different kneading portions G. In this manner, a plurality of kneading portions G spaced apart can be formed on the web L, with each adjacent kneading portion G having opposite arching directions.

[0080] In the second aspect, please refer to Figure 4. The embodiment of the present application also adopts a battery cell manufacturing device 1000. The battery cell manufacturing device 1000 provided in the embodiment of the present application is used to prepare battery cells based on the material strip L. The battery cell manufacturing device 1000 includes a stacking platform 400 and a pinching mechanism 100 in any of the above embodiments. The stacking platform 400 is located downstream of the pinching mechanism 100. The pinching mechanism 100 is used to perform a pinching operation on the material strip L to form an arched and pinched pinching portion G on the material strip L to output the laminated material strip 2. The multiple pinching portions G are arranged at intervals in the extension direction of the laminated material strip 2. The battery cell manufacturing device 1000 can fold the laminated material strip 2 at each pinching portion G in turn to fold it on the stacking platform 400 to form a battery cell.

[0081] The battery cell is a multi-layer structure made of stacked pole pieces and separators. In the stacking direction of the battery cell, the polarity of each two adjacent pole pieces is opposite, and the two pole pieces with opposite polarity are separated by a separator.

[0082] The material strip L may be a diaphragm material strip 1B. Furthermore, the material strip L may be a composite material strip 1, which includes a diaphragm material strip 1B and a plurality of electrode groups 1A spaced apart along the extending direction of the diaphragm material strip 1B. Each electrode group 1A is composited with the diaphragm material strip 1B, and the positions of the composite electrode groups 1A and the diaphragm material strip 1B may remain unchanged.

[0083] As an example (as shown in Figure 5), the composite material strip 1 includes a diaphragm material strip 1B and multiple electrode groups 1A, and each electrode group 1A includes a electrode, and the electrode between each two adjacent electrode groups 1A is located on opposite sides of the diaphragm material strip 1B and one of the electrode pieces is the first electrode piece A1, and the other electrode piece is the second electrode piece A2, and the first electrode piece A1 and the second electrode piece A2 have opposite polarity.

[0084] As another example (as shown in FIG6 ), the composite material strip 1 includes two layers of diaphragm material strips 1B, and each electrode group 1A includes a first electrode piece A1 and a second electrode piece A2. The first electrode piece A1 is located on the outer layer of the composite material strip 1, and the second electrode piece A2 is located between the two layers of diaphragm material strips 1B. The first electrode piece A1 between each two adjacent electrode groups 1A is located on opposite sides of all the diaphragm material strips 1B. Regarding the specific type of the composite material strip 1, those skilled in the art can make conventional settings.

[0085] The pinching assembly 10 is used to perform a pinching operation on the material strip L to form a kneaded portion G on the material strip L that is arched and kneaded. When the material strip L is a composite material strip 1, in actual application, the area between adjacent electrode groups 1A in the composite material strip 1 (as the area to be pinched) is the diaphragm material strip 1B. When preparing a battery cell, the pinching assembly 10 performs a pinching operation on the diaphragm material strip 1B located between each two adjacent electrode groups 1A on the composite material strip 1. Specifically, regardless of the number of layers of the diaphragm material strip 1B, each pinching assembly 10 simultaneously pinches all layers of the diaphragm material strip 1B located in the area to be pinched when performing the pinching operation, forming a kneaded portion G formed by arching and pinching at least one layer of the diaphragm material strip 1B.

[0086] After the pinching and folding mechanism 100 forms the pinching portions G on the material strip L, it outputs the laminated material strip 2. It can be understood that the laminated material strip 2 has multiple pinching portions G spaced apart along its extension direction. The battery cell forming apparatus 1000 can sequentially fold the laminated material strip 2 at each pinching portion G to form battery cells on the lamination platform 400.

[0087] If the material strip L is a composite material strip 1, the laminated material strip 2 is a structure in which the diaphragm material strip 1B and the electrode are composited. When folded, a battery cell in which the electrode and the diaphragm are stacked can be directly obtained.

[0088] If the material strip L is a diaphragm strip 1B, then the laminated material strip 2 is a strip-shaped diaphragm member having a pinching portion G. To prepare a battery cell, a pole piece conveying mechanism and a laminating mechanism can be provided downstream of the pinching and folding assembly 10. The pole piece conveying device is used to place a sheet of pole pieces on the laminated material strip 2 comprising only the diaphragm strip 1B. The laminating mechanism is used to laminate the pole pieces with the laminated material strip 2, and then the laminated material strip 2 with the pole pieces is folded at each pinching portion to obtain a battery cell. Alternatively, during the folding process, an additional pole piece conveying device is used to place a sheet of pole pieces between the diaphragms on both sides of each pinching portion of the laminated material strip 2 without the pole pieces, thereby obtaining a battery cell in which the pole pieces and the diaphragm are stacked.

[0089] In practical applications, to facilitate Z-folding of the laminated web 2, the pinching and folding assembly 10 can form pinching portions G on the laminated web 2 with opposite curvature directions. Specifically, the battery cell manufacturing apparatus 1000 can include two pinching and folding mechanisms 100, which are sequentially arranged along the web path of the web L and respectively cause the web L to bend in opposite directions parallel to the first direction X. Alternatively, the pinching mechanism can include the first pinching and folding assembly 10A and the second pinching and folding assembly 10B, with the two pinching and folding assemblies 10 forming pinching portions G with different curvature directions on the web L.

[0090] 4 , on the conveying path of the material strip L, the material strip L 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. The battery cell making device 1000 then folds the laminated material strip 2 in sequence 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.

[0091] After the pinching and folding mechanism 100 outputs the laminated web 2, the laminated web 2 can be folded at each pinching portion G under the action of gravity, and then folded in a Z-shape on the stacking platform 400. Alternatively, the battery cell manufacturing device 1000 includes a swinging mechanism, located downstream of the pinching and folding mechanism 100, for bending the laminated web 2 at each pinching portion G and swinging it back and forth laterally to fold the laminated web 2 in a Z-shape. Specifically, the swinging mechanism can include a swinging robot that can clamp the laminated web 2 and swing the laminated web 2 to fold it at the pinching portion G.

[0092] In actual use, the folding mechanism 100 of the battery cell manufacturing apparatus 1000 can fold the strip L into multiple, spaced-apart regions to form kneading portions G, thereby forming a laminated strip 2. The laminated strip 2 can then be folded at each kneading portion G, achieving a Z-shaped folding of the laminated strip 2 to form a battery cell. The presence of the kneading portions G ensures greater consistency in the folding angles, resulting in higher accuracy and quality in the battery cell lamination.

[0093] 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 , wherein the thermal lamination mechanism 500 is located upstream of the pinching and folding mechanism 100 . The feeding mechanism 300 is used to convey the diaphragm strip 1B and multiple sets of electrode sheets to the thermal lamination mechanism 500 . The thermal lamination mechanism 500 is used to thermally laminate the multiple sets of electrode sheets onto the diaphragm strip 1B, outputting a composite strip 1 comprising the diaphragm strip 1B and multiple electrode sheet groups 1A spaced apart along the extending direction of the diaphragm strip 1B. The pinching and folding mechanism 100 is used to form a pinching portion G in the diaphragm strip 1B region between two adjacent electrode sheet groups 1A of the composite strip 1 to output a laminated strip 2 .

[0094] In the composite material strip 1 , the pole pieces and the diaphragm material strips 1B are composited together, which helps ensure that the pole pieces and the diaphragm material strips 1B are in good contact and maintain a positional relationship during the process of preparing the battery cell.

[0095] 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.

[0096] The thermal bonding mechanism 500 is used to thermally bond the electrode assembly 1A and the separator strip 1B. The specific structure of the thermal bonding mechanism 500 can be conventionally configured by those skilled in the art. For example, the thermal bonding 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 bond the electrode assembly 1A and the separator strip 1B in the blank strip L passing through the rolling gap. In other examples, the thermal bonding mechanism 500 may also include a hot pressing plate, which thermally bonds the electrode assembly 1A and the separator strip 1B together.

[0097] At this time, the battery cell manufacturing device 1000 can also thermally composite the green sheet L2 to form the composite sheet 11 , and the composite sheet 11 can be prepared before the pinching and folding operation.

[0098] 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.

[0099] 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.

[0100] In actual use, the pinching and folding mechanism 100 continuously outputs the laminated material strip 2, which is continuously folded, thereby increasing the number of battery cell layers. After the target number of battery cells are 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 device 1000 can continuously produce multiple battery cells, greatly improving production efficiency.

[0101] In some embodiments, referring to FIG. 4 , the cutter mechanism 200 further includes a heat sealing portion 202 , which is used to heat seal the cut ends of the laminated material strip 2 after being cut by the cutter portion 201 .

[0102] When the laminated material strip 2 is obtained by pinching and folding the composite material strip 1 by the pinching and folding mechanism 100, the heat sealing part 202 can hot-press the cut end of the laminated material strip 2 so that the layers of material at the cut end are connected together. The layers of material are tightly combined and the connection is reliable, which helps to maintain the structural stability of the laminated material strip 2.

[0103] For example, the heat sealing section 202 includes a hot air blowing section and a clamping plate. The hot air blowing section is used to blow hot air toward the cut end, and the clamping plate is used to clamp the cut end. The combination of the two heats and pressurizes the cut end of the laminated web 2. Regarding the specific structure of the heat sealing section 202, those skilled in the art can make conventional arrangements.

[0104] 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.

[0105] On the third aspect, please refer to Figure 7. The embodiment of the present application also provides a laminated material strip 2, including a diaphragm material strip 1B. The laminated material strip 2 has a plurality of kneading parts G arranged at intervals along its extension direction. Each kneading part G is obtained by arching and kneading the diaphragm material strip 1B along the thickness direction of the laminated material strip 2.

[0106] 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.

[0107] The diaphragm strip 1B has a plurality of regions spaced apart from each other. The diaphragm strip 1B in each region is arched and kneaded along the thickness direction of the laminated strip 2 to form kneaded portions G. In other words, the kneaded portions G are formed by folding the diaphragm strip 1B.

[0108] As one of the key components of a battery cell, the separator strip 1B is typically folded into a Z-shape to prepare the battery cell. In practical applications, the solution of the embodiment of the present application can quickly locate the folding angle during the Z-folding process based on the various kneading portions G formed on the laminated strip 2, which helps improve the lamination accuracy and enhance the quality of the battery cell product.

[0109] As mentioned above, the battery cell is formed by stacking the electrode sheets and the diaphragm. In the embodiment of the present application, if the laminated material strip 2 only includes the diaphragm material strip 1B, the electrode sheets can be composited on the laminated material strip 2 through other processes in the later stage to obtain the laminated material strip 2 composited with the electrode sheets, and then the laminated material strip 2 composited with the electrode sheets can be Z-folded to prepare the battery cell. Alternatively, during the Z-folding process of the laminated material strip 2 without the electrode sheets, the electrode sheets can be placed between the diaphragms to prepare the battery cell.

[0110] To improve cell production efficiency, in some embodiments, the laminated strip 2 further includes a plurality of electrode sheet groups 1A spaced apart along the extension direction of the diaphragm strip 1B. The electrode sheets of each electrode sheet group 1A are stacked on the diaphragm strip 1B. The region of the diaphragm strip 1B between two adjacent electrode sheet groups 1A in the laminated strip 2 is arched and kneaded along the thickness direction of the laminated strip 2 to form a kneaded portion G.

[0111] 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.

[0112] 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.

[0113] 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 folded in a Z shape to form a battery cell.

[0114] At this time, the electrode is compounded on the laminated material strip 2, so that the battery cell can be prepared directly through the laminated material strip 2 by Z-shaped folding. Since the diaphragm material strip 1B area between the two adjacent electrode groups 1A is pinched to form a pinching part G, during Z-shaped folding, it can be folded smoothly and quickly at each pinching part G to obtain a battery cell with basically consistent folding angle position, which is beneficial to improving the stacking efficiency of the battery cell and improving the quality of the battery cell.

[0115] In some embodiments, the arching directions of each two adjacent kneading portions G in the laminated material strip 2 are opposite. In actual application, when performing Z-shaped lamination, the folding directions of each kneading portion G are generally opposite. In this case, the arching directions of each adjacent kneading portion G are opposite, which makes lamination more convenient.

[0116] 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 a 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.

[0117] 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.

[0118] In a fourth aspect, an embodiment of the present application further provides a battery cell, which comprises a structure formed by sequentially folding the laminated strip 2 of the above embodiment at each kneading portion G. The battery cell has all the above-mentioned beneficial effects.

[0119] The folding mechanism 100, the battery cell manufacturing device 1000, the laminated material strip 2 and the battery cells provided in the embodiment of the present application can use the folding components 10 in the folding mechanism 100 to fold the corner positions of the laminated material strip 2 to form a pinching portion G when producing battery cells. When stacking, the laminated material strip 2 can be folded in turn at each pinching portion G, and the pinching portion G can be used to accurately locate the corner position of the laminated material strip 2, which helps to improve the stacking accuracy of the laminated material strip 2 and improve the quality of the battery cells.

[0120] 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.

[0121] 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: A pinching and folding assembly (10) comprises a picking member (11) and a kneading member (12), wherein the kneading member (12) forms a kneading space (N), and the picking member (11) has a picking end (11a), and the picking end (11a) is movably arranged relative to the kneading member (12) along a first direction (X); The picking end (11a) is capable of moving forward and backward in the kneading space (N) during movement, and the kneading member (12) is capable of changing the size of the kneading space (N) in a second direction (Y) intersecting with the first direction (X), so that the pinching and folding component (10) performs a pinching and folding operation.

2. The pinching and folding mechanism (100) according to claim 1, It is characterized in that The kneading element (12) has a feed end (12b), and the kneading space (N) is arranged to penetrate the feed end (12b); the picking end (11a) advances and retreats from the kneading space (N) via the feed end (12b), and the picking end (11a) exiting the kneading space (N) is opposite to the feed end (12b) and is arranged at a distance.

3. The pinching and folding mechanism (100) according to claim 1, It is characterized in that The kneading element (12) includes two kneading sub-elements (12c), and the two kneading sub-elements (12c) are spaced apart in the second direction (Y) to form the kneading space (N), and can move relative to each other to change the size of the kneading space (N).

4. The pinching and folding mechanism (100) according to claim 1, It is characterized in that The pinching and folding mechanism (100) comprises a first pinching and folding component (10A) and a second pinching and folding component (10B); The kneading elements (12) of the first pinching and folding assembly (10A) and the second pinching and folding assembly (10B) are staggered in the second direction (Y), and the feed ends (12b) of the kneading elements (12) of the two kneading elements (12) are spaced apart and arranged facing each other in the first direction (X) along the orthographic projections of the second direction (Y).

5. The pinching and folding mechanism (100) according to claim 1, It is characterized in that The pinching and folding mechanism (100) further comprises a heating element (20), wherein the heating element (20) is arranged on the picking element (11) and / or the kneading element (12).

6. The pinching and folding mechanism (100) according to claim 1, 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 strip (L) and locate the area to be pinched and folded on the material strip (L) according to the characteristic information, and the pinching and folding component (10) is used to perform a pinching and folding operation on the area to be pinched and folded on the material strip (L).

7. A battery cell manufacturing device (1000), It is characterized in that The invention comprises a stacking platform (400) and a pinching and folding mechanism (100) as claimed in any one of claims 1 to 6, wherein 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 and folding operation on a material strip (L) to form an arched and pinched pinching portion (G) on the material strip (L) to output a stacked material strip (2), wherein a plurality of the pinching portions (G) are arranged at intervals in the extension direction of the stacked material strip (2); The battery cell manufacturing device (1000) can fold the laminated material strip (2) in sequence at each of the kneading parts (G) to form a battery cell on the laminated platform (400).

8. The battery cell manufacturing device (1000) according to claim 7, It is characterized in that The battery cell manufacturing device (1000) further comprises a feeding mechanism (300) and a thermal compounding mechanism (500); the thermal compounding mechanism (500) is located upstream of the pinching and folding mechanism (100); The feeding mechanism (300) is used to convey the diaphragm material strip (1B) and multiple groups of pole pieces to the thermal composite mechanism (500), and the thermal composite mechanism (500) is used to thermally composite the multiple groups of pole pieces on the diaphragm material strip (1B) to output a composite material strip (L) comprising the diaphragm material strip (1B) and multiple pole piece groups (1A) arranged at intervals along the extension direction of the diaphragm material strip (1B); The pinching and folding mechanism (100) is used to form the pinching portion (G) in the region of the diaphragm material strip (1B) located between two adjacent pole piece groups (1A) of the composite material strip (L) to output the laminated material strip (2).

9. The battery cell manufacturing device (1000) according to claim 7, 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).

10. The battery cell manufacturing device (1000) according to claim 9, 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) after being cut by the cutting portion (201).

11. A laminated material strip (2), It is characterized in that The laminated material strip (2) includes a diaphragm material strip (1B), and the laminated material strip (2) has a plurality of kneading portions (G) arranged at intervals in its extension direction, and each of the kneading portions (G) is obtained by the diaphragm material strip (1B) being arched and kneaded along the thickness direction of the laminated material strip (2).

12. The laminated strip (2) according to claim 11, It is characterized in that The laminated material strip (2) further comprises a plurality of pole piece groups (1A) arranged at intervals along the extension direction of the diaphragm material strip (1B), and the pole pieces of each pole piece group (1A) are stacked with the diaphragm material strip (1B); The region of the diaphragm material strip (1B) of the laminated material strip (2) located between two adjacent pole piece groups (1A) is arched along the thickness direction of the laminated material strip (2) and is kneaded to form the kneading portion (G).

13. The laminated strip (2) according to claim 12, 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).

14. The laminated strip (2) according to claim 11, It is characterized in that The separator strips (1B) forming the kneading portion (G) are adhered to each other.

15. A battery cell, It is characterized in that The battery core comprises a structure formed by folding the laminated material strip (2) as described in any one of claims 11 to 14 at each of the kneading parts (G) in sequence.

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