CN117393833A - Kneading mechanism, battery cell manufacturing device, battery cell manufacturing method, lamination material belt and battery cell - Google Patents

Abstract

The utility model relates to a hold between fingers mechanism, system electric core device, system electric core method, lamination material area and electric core, hold between fingers the mechanism and include at least one and hold between fingers the subassembly, arrange on the delivery path of material area, each hold between the subassembly and be used for carrying out the operation of holding between the fingers the material area that lies in the delivery path, hold between the operation and include forming on the material area along the arched portion of the thickness direction arch of material area to hold between the arched portion, with the formation of holding between the fingers the part on the material area. When producing the electric core, each kneading component in the kneading mechanism can be utilized to knead and fold out the kneading part to the folding angle position of the lamination material belt, when laminating, each kneading part in the lamination material belt can be folded in sequence, and the kneading part is utilized to accurately position the folding angle position of the lamination material belt, thereby being beneficial to improving the lamination precision of the lamination material belt and improving the electric core quality.

Description

Kneading mechanism, battery cell manufacturing device, battery cell manufacturing method, lamination material belt and battery cell

Technical Field

The application relates to the technical field of battery manufacturing, in particular to a pinching mechanism, a battery cell manufacturing device, a battery cell manufacturing method, a lamination material belt and a battery cell.

Background

The lithium ion battery cell mainly has two structures of winding and lamination. The lamination cell is formed by stacking a positive plate, a negative plate and a diaphragm in sequence to obtain a bare cell, and then performing operations such as lamination, encapsulation and the like to obtain a complete battery. At present, a lamination cell is prepared by adopting a Z-shaped lamination mode to prepare a bare cell, when lamination is carried out, diaphragms between two adjacent pole pieces are folded to form folded angle positions, but the folded angle positions formed by the diaphragms at different positions cannot be unified, so that the alignment precision deviation between the pole pieces of the lamination cell is larger, and the quality of the cell is affected.

Disclosure of Invention

Based on the above, it is necessary to provide a pinching mechanism, a cell manufacturing device, a cell manufacturing method, a lamination material belt and a cell, aiming at the problem that the cell lamination precision is not high and the cell quality is affected.

In a first aspect, embodiments of the present application provide a pinching mechanism, including:

and at least one pinching assembly disposed on the conveying path of the material tape, each pinching assembly for performing a pinching operation on the material tape located on the conveying path, the pinching operation including forming an arch portion on the material tape that arches in a thickness direction of the material tape, and pinching the arch portion to form a pinching portion on the material tape.

In some embodiments, the pinching assembly comprises a spangle and a kneading element, the kneading element forming a kneading space;

the arch belt is used for enabling the material belt positioned in the conveying path to enter the kneading space and form the arch part, and the kneading piece is used for kneading the arch part positioned in the kneading space to form the kneading part.

In some embodiments, the arch band is movably disposed and during movement the band in the conveying path can be caused to enter the kneading space to form the arch;

The kneading elements comprise two kneading elements which are arranged at intervals, the kneading space is formed between the two kneading elements, the two kneading elements can relatively move, and the size of the kneading space can be adjusted in the moving process so as to knead the arched part in the kneading space.

In some embodiments, the arch band includes an arch band plunger that is movably disposed and that pushes the web in the conveying path into the kneading space during movement to form the arch.

In some embodiments, the pinching assembly includes a heating element disposed on the pinching assembly and configured to heat the pinching assembly during the pinching operation performed by the pinching assembly. .

In some embodiments, all of the kneading members are used to form a plurality of kneading portions on a web that are arranged at intervals along the extending direction of the web, and the arching directions of every adjacent two of the kneading portions are opposite.

In some embodiments, the at least one pinching assembly comprises a first pinching assembly and a second pinching assembly spaced apart along the conveying path, both forming opposing arching directions of the pinch formed on the web.

In some embodiments, the pinching mechanism further includes a detecting element, where the detecting element is configured to obtain characteristic information of the material belt located on the conveying path, and position a region to be pinched of the material belt according to the characteristic information, and the pinching component is configured to perform the pinching operation on the positioned region to be pinched.

In a second aspect, an embodiment of the present application provides a battery cell manufacturing device, where the battery cell manufacturing device is capable of manufacturing a battery cell by using a composite material tape, where the composite material tape includes a diaphragm material tape and a plurality of pole piece groups that are arranged at intervals along an extending direction of the diaphragm material tape, and the battery cell manufacturing device includes a lamination platform and the pinching mechanism described in the foregoing embodiment; the lamination platform is positioned at the downstream of the pinching mechanism;

the kneading mechanism is used for carrying out kneading operation on the composite material belt so as to form the kneading parts in the area of the composite material belt between two adjacent pole piece groups to output laminated material belts, and the arch directions of the two adjacent kneading parts in the laminated material belts are opposite;

the cell manufacturing device can enable the lamination material belts to be folded at the kneading parts in sequence and folded on the lamination platform to form the cell.

In some embodiments, the cell manufacturing device further comprises a feeding mechanism and a thermal compounding mechanism, wherein the feeding mechanism is used for conveying the diaphragm material belt and the plurality of groups of pole pieces to the thermal compounding mechanism;

the thermal compounding mechanism is used for thermally compounding the diaphragm material belt and each group of pole pieces so as to output the compound material belt.

In some embodiments, the cell making apparatus further comprises a cutter mechanism downstream of the pinching mechanism and disposed upstream of the lamination stage;

the cutter mechanism comprises a cutter part for cutting off the laminated material strip.

In some embodiments, the cutter mechanism further comprises a heat seal for heat sealing the cut end of the laminate web cut by the cutter.

In a third aspect, an embodiment of the present application provides a method for manufacturing a battery cell, including:

providing a composite material belt, wherein the composite material belt comprises a diaphragm material belt and a plurality of pole piece groups which are arranged at intervals along the extending direction of the diaphragm material belt;

performing a kneading operation on the composite material strip to form kneading portions in a region of the composite material strip between adjacent two of the pole piece groups to output a laminated material strip, and arching directions of each adjacent two of the kneading portions in the laminated material strip are opposite;

And folding the lamination material belt at each kneading part in turn to obtain a plurality of battery cores formed by stacking the pole piece groups.

In some embodiments, the step of providing a composite tape comprises:

providing a diaphragm material belt and a plurality of groups of pole pieces which are arranged at intervals along the extending direction of the diaphragm material belt;

and thermally compounding each group of pole pieces on the diaphragm material belt to obtain the composite material belt.

In some embodiments, after the lamination material belt is folded at each kneading part in turn to obtain a plurality of battery cells in which the pole piece groups are stacked, the method includes:

cutting off the connection between the unfolded lamination material belt and the battery cell;

heat sealing the cut ends of the unfolded laminate web.

In a fourth aspect, an embodiment of the present application provides a laminated material strip, including a diaphragm material strip and a plurality of pole piece groups disposed at intervals along an extending direction of the diaphragm material strip, where pole pieces of each pole piece group are disposed with the diaphragm material strip;

the laminated material strips are arched and kneaded in the thickness direction of the laminated material strips in the areas between two adjacent pole piece groups, so that a plurality of kneading parts which are arranged at intervals along the extending direction of the laminated material strips are formed, and the arching directions of the adjacent kneading parts are opposite.

In some embodiments, the separator strip comprises two layers, the pole piece group comprises a first pole piece and a second pole piece, the second pole piece is arranged between the two layers of the separator strip, the first pole piece is arranged on the outer side layer of the laminated strip, and the first pole pieces of adjacent pole piece groups are positioned on opposite sides of the laminated strip; all the separator material strips located between two adjacent pole piece groups are arched and kneaded to form the kneading portions.

In some embodiments, the membrane strips forming the kneading section are adhered to each other.

In a fifth aspect, an embodiment of the present application provides a battery cell, where the battery cell is formed by folding a laminated material strip as described above at each kneading portion in sequence.

According to the kneading mechanism, the battery cell manufacturing device, the battery cell manufacturing method, the laminated material belt and the battery cell, when the battery cell is produced, the kneading parts can be kneaded at the folding angle positions of the laminated material belt by utilizing the kneading components in the kneading mechanism, when the battery cell is laminated, the kneading parts can be sequentially folded at the kneading parts of the laminated material belt, the folding angle positions of the laminated material belt are accurately positioned by utilizing the kneading parts, the lamination precision of the laminated material belt is improved, and the battery cell quality is improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic structural view of a pinching mechanism according to some embodiments of the present application.

Fig. 2 is a schematic structural view of a kneaded material strip according to some embodiments of the present application.

Fig. 3 is a schematic view of a pinching process of a pinching assembly according to some embodiments of the present application.

Fig. 4 is a system schematic diagram of a battery cell manufacturing device according to some embodiments of the present application.

Fig. 5 is a schematic structural view of a composite tape according to some embodiments of the present application.

Fig. 6 is a schematic structural view of a composite web according to further embodiments of the present application.

Fig. 7 is a schematic structural view of a laminated web according to some embodiments of the present application.

Fig. 8 is a flow chart of a method for manufacturing a battery cell according to some embodiments of the present application.

Fig. 9 is a schematic flow chart of a method for manufacturing a battery cell according to other embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

1000. Manufacturing a battery cell device; 100. a pinching mechanism; 10. a pinching assembly; 10A, a first pinching component; 10B, a second pinching component; 11. an arch strip; 12. a kneading member; n, kneading space; 12c, kneading elements; 20. a heating member; 30. a detecting member; 200. a cutter mechanism; 201. a cutter part; 202. a heat sealing part; 300. a feeding mechanism; 301. a conveying roller; 400. a lamination platform; 500. a thermal compounding mechanism; 501. a press roller; 1. a composite material belt; 2. laminating material belts; g. an arch portion; G. a kneading section; 1A, pole piece groups; a1, a first pole piece; a2, a second pole piece; 1B, a diaphragm material belt; l, material belt.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, if any; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, a first feature "on" or "under" a second feature may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium, unless expressly stated and defined otherwise. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Lamination type lithium battery preparation generally adopts a similar Z-shaped lamination. The corner locations between adjacent lamination units are called fold locations when laminating. At present, the folding angle position is usually generated in the lamination process, the folding angle position of each lamination sheet unit is inconsistent in lamination, the lamination precision is not high, and the battery quality is influenced. It is therefore necessary to improve the uniformity of the angular positions between the lamination units, and to improve lamination accuracy and battery quality. Based on this, this application embodiment provides pinching mechanism, and it can pinch out the dog-ear position on waiting to fold the material before the lamination operation, and each dog-ear position is fixed a position to each accuracy, and folding material waiting to fold with each dog-ear position as the center when the lamination can improve lamination precision and battery quality.

The pinching mechanism provided by the embodiment of the application can be applied to battery lamination, but is not limited to the application, and can be applied to other products needing to be folded like a Z shape. When the pinching mechanism is applied to the battery pack, the object pinched by the pinching mechanism in the battery pack varies depending on the specific configuration of the pack. In some examples, when the battery lamination is formed by folding four layers of materials of the negative electrode sheet, the diaphragm material belt, the positive electrode sheet and the diaphragm material belt in a zigzag-like manner after being stacked, the pinching mechanism can pinch the four layers of materials simultaneously in the extending direction of the four-layer material structure to obtain a plurality of pinching parts which are sequentially spaced, and the positions of the pinching parts are folding positions.

First, a pinching mechanism provided in the first aspect of the embodiment of the present application will be described.

Referring to fig. 1, a pinching mechanism 100 provided in the embodiment of the present application includes at least one pinching assembly 10 disposed on a conveying path of a material tape L, each pinching assembly 10 being configured to perform a pinching operation on the material tape L located on the conveying path, the pinching operation including forming an arch portion G on the material tape L that arches in a thickness direction of the material tape L, and pinching the arch portion G to form a pinching portion G on the material tape L.

The pinching assembly 10 is disposed on the conveying path of the web L, and the pinching assembly 10 is capable of performing a pinching operation on the web L of the path itself. The conveying path of the web L may be a straight path, a curved path, a folding path, or the like. In the embodiment shown in fig. 1, the conveying path is a straight path. The web L is not limited to the web L for preparing the battery stack mentioned above.

Typically, the pinching assembly 10 has a pinching station located on the transport path along which the web L passes during the feeding process. The pinching assembly 10 may perform a pinching operation on the web L at its pinching station.

The pinching operation includes two steps of arching the material web L in the thickness direction thereof to form the arch portion g on the material web L, and kneading the arch portion g, which may be performed first to arch the material web L to form the arch portion g, and then to knead the arch portion g, or may be performed simultaneously. As shown in fig. 2, the kneading portion G formed on the material belt L is provided so as to protrude in the thickness direction of the material belt L.

It will be appreciated that the arch g comprises a plurality of portions which are connected in turn in a bent manner, and that the plurality of portions may be connected in a V-shape, W-shape, U-shape, or the like. The pinching and folding unit 10 pinches the arch portion g, that is, the plurality of portions are pressed together, for example, the arch portion g having a V-shape, a W-shape, a U-shape, or the like is pressed together to form an I-shape structure. The dome G is kneaded to obtain a kneading portion G. During lamination, the strip L is bent centered around the kneading section G. The direction of the kneading arch g is generally a direction intersecting the arch direction of the arch g.

In practical use, the kneading part G may be kneaded at the folded angle position of the material tape L by each kneading assembly 10 in the kneading mechanism 100 on the material tape L for producing the battery pack. So, material area L is folding when folding, can fold at each kneading part G of material area L in proper order, utilizes kneading part G accurate positioning material area L's dog-ear position, can improve material area L's lamination precision, improves product quality.

In some embodiments, referring to fig. 1, a kneading assembly 10 includes a spangle 11 and a kneading element 12, the kneading element 12 forming a kneading space N. The arch belt 11 is for causing the material belt L located in the conveying path to enter the kneading space N and form the arch portion G, and the kneading portion is for kneading the arch portion G located in the kneading space N to form the kneading portion G.

The arch band 11 may arch the material band L directly or without contacting the material band L and feed the arched material band L into the kneading space N. For example, the arch belt 11 includes a negative pressure absorbing member that can absorb the material belt L by negative pressure to pull the material belt L to arch. For another example, the arch band 11 includes a positive pressure air blower that blows positive pressure air to push the material strip L to arch. In the embodiment of the present application, the arch band 11 may arch the material band L by pulling or pushing. When the strip L is in place, it can be positioned in the kneading space N and forms an arch g.

The kneading elements 12 can fold the material web L located in the kneading space N. Understandably, the kneading space N of the kneading elements 12 is variable in size. Illustratively, the kneading elements 12 include two platens hinged at one end and separated at the other end, and the size of the kneading space N therebetween can be changed to knead the dome g when the platens are rotated with respect to the hinged ends thereof. Also by way of example, the kneading elements 12 comprise two balloon elements which are spaced apart to form a kneading space N, the size of which can be varied by varying the amount of gas which is flushed into the balloon elements to pinch the camber g.

In the actual operation, the material strips L in the kneading space N may be kneaded together by the kneading elements 12 after the material strips L are arched into the kneading space N by the arch members 11 to form the arch g. The arch band 11 may be operated in synchronization with the kneading elements 12 to knead the arch portion g during the row Cheng Gongqi portion g.

At this time, the pinching of the material belt L is realized through the cooperation of the arch belt 11 and the kneading piece 12, and the structure is simple and easy to realize.

In some embodiments, referring to fig. 3, the arch band 11 is movably provided, and the material web L located in the conveying path can be made to enter the kneading space N during the movement to form the arch g.

In an example, the arch band 11 is arranged on the side of the kneading space N facing away from the material web L, and a clamping jaw or suction structure can be provided on the arch band 11 to pick up the material web L, the arch band 11 pulling the material web L into the kneading space N during movement.

In this case, the moving arch strip 11 can reliably arch the material web L.

In some embodiments, referring to fig. 3, the arch band 11 comprises an arch band compression bar that is movably arranged and that during the movement pushes the material web L located in the conveying path into the kneading space N to form the arch g.

Specifically, the arch band compression lever is movably provided with respect to the kneading elements 12 in the thickness direction of the material band L. The kneading space N of the kneading element 12 is located in the path of movement of the belt-arch pressure lever, which during movement can push part of the material web L into the kneading space N, so that the bulge g is formed. It is understood that the arch band 11 and the kneading elements 12 are arranged on opposite sides in the thickness direction of the material belt L of the conveying path.

At this time, the arch band 11 has a simple structure, a simple movement mode and easy realization.

In some embodiments, with continued reference to fig. 3, the kneading elements 12 include two kneading elements 12c disposed at a spacing, a kneading space N is formed between the two kneading elements 12c, the two kneading elements 12c are relatively movable, and the size of the kneading space N can be adjusted during the movement to knead the dome g located in the kneading space N.

The moving direction of the two kneading elements 12c corresponds to the extending direction of the material belt L to adjust the size of the kneading space N in the extending direction of the material belt L, kneading the arch portion g located in the kneading space N. Specifically, one of the two kneading elements 12c may be fixed, and the other may be moved. It is also possible that both kneading elements 12c are movable.

The kneading elements 12c may comprise at least one kneading block or may comprise a plurality of kneading blocks. The two kneading elements 12c are arranged opposite to each other in the moving direction. Each kneading assembly 10 further includes a kneading drive connected to at least one of the two kneading elements 12c and driving the kneading elements 12c to move. The kneading driver may be a linear motor, a telescopic cylinder, or the like. In general, the force of the kneading elements 12 against the arches g can be adjusted by adjusting the size of the gap between the kneading elements 12 c.

At this time, the kneading elements 12c are simple in structure, simple in movement manner, and easy to realize.

The pinching process of the pinching assembly 10 in some embodiments is described in connection with fig. 3: in the state a, the material belt L passes through a pinching station of the pinching assembly 10; in the state b, the arch band 11 of the pinching assembly 1 pushes the material band L into the kneading space N of the kneading element 12, and an arch part g is obtained; in the state c, two kneading elements 12c of the kneading elements 12 are close to each other, and the arch band 11 exits the kneading space N; in the d state, the two kneading elements 12c clamp the material arches G in the kneading space N to form kneading portions G on the material strips L.

In some embodiments, the kneading assembly 10 includes a heating member 20, the heating member 20 being disposed on the kneading assembly 10 and configured to heat the kneading assembly 10 during a kneading operation performed by the kneading assembly 10.

The heating member 20 may be a heating wire, a heating plate, or the like, and the specific type thereof is not limited as long as it can heat up. In particular, when the pinching assembly 10 comprises the pinching elements 12, the arching strip 11, the heating elements 20 may be provided on the pinching elements 12 and/or the arching strip 11.

In actual use, the heating element 20 can be utilized to heat the arched portion G in the process of forming the arched portion G by the arched material belt L of the arched belt element 11 and/or in the process of kneading the arched portion G by the kneading element 12, so that each part of the arched portion G is kneaded more firmly, and the shaping effect of the kneading portion G is better.

In some embodiments, referring to fig. 2, the entire pinching assembly 10 is used to form a plurality of kneading portions G on the material strip L, which are arranged at intervals along the extending direction of the material strip L, and the arching directions of every two adjacent kneading portions G are opposite.

For example, at least two kneading parts G having opposite arching directions may be formed at intervals on the web L by one kneading assembly 10. For example, the pinching mechanism 100 includes a flip drive that can flip the pinching assembly 10 in the thickness direction of the web L so that the pinching assembly 10 switches between two pinching states. In one of the pinching states, the pinching assembly 10 may arch the material tape L from the first side to the second side in the thickness direction thereof by the pinching portion G, and in the other pinching state, the pinching assembly 10 may arch the material tape L from the second side to the first side by the pinching portion G.

In practical use, when Z-shaped lamination is performed, the folding directions of the kneading parts G are approximately opposite, and at this time, the arching directions of every adjacent kneading parts G are opposite, so that lamination is facilitated.

In some embodiments, referring to fig. 1, at least one pinching assembly 10 includes a first pinching assembly 10A and a second pinching assembly 10B that are spaced apart along the conveying path, and the two pinching assemblies form a pinching portion G on the web L that has opposite arching directions.

In order to make it possible for all the pinching assemblies 10 to have opposite arching directions for every adjacent two pinching portions G, two sets of pinching assemblies 10 are provided, one set of pinching assemblies 10 arching the pinching portions G from the first side toward the second side of the web L and the other set of pinching assemblies 10 arching the pinching portions G from the second side toward the first side of the web L.

At this time, the pinching mechanism 100 is designed to arch the material strip L in different arch directions by designing the two sets of pinching components 10 so that the pinching components 10 of each set form the pinching portions G with opposite arch directions on the material strip L, which helps to simplify the structure of the pinching mechanism 100, reduce the cost, and simplify the control.

In some embodiments, referring to fig. 1, the pinching mechanism 100 further includes a detecting element 30, the detecting element 30 is configured to obtain characteristic information of the material strip L located on the conveying path, and position a region to be pinched of the material strip L according to the characteristic information, and the pinching assembly 10 is configured to perform pinching operation on the positioned region to be pinched.

The detecting member 30 can obtain the characteristic information of the material taking tape L. For example, the detecting member 30 includes a CCD camera, acquires image information of the material tape L as characteristic information by the CCD camera, and positions a region to be pinched of the material tape L according to the image information. For another example, the detecting member 30 includes an ultrasonic thickness gauge, and obtains thickness information of the material tape L as characteristic information by the ultrasonic thickness gauge, and positions a region to be pinched of the material tape L according to the thickness information, so as to adapt to a case where the thickness of the region to be pinched is larger or smaller.

When the characteristic information adopted by the detecting member 30 includes one of the regions to be pinched of the material strip L, it is indicated that the other region to be pinched of the material strip L is passing through the pinching assembly 10, and thus the region to be pinched of the passing through pinching assembly 10 is positioned. At this time, the detecting member 30 may control the feeding of the material tape L and control the pinching assembly 10 to perform the pinching operation on the region to be pinched of the path itself.

At this time, the detection member 30 controls the pinching assembly 10 to start pinching operation, so that the position consistency of the pinching assembly 10 at the kneading portion G formed on the material web L is good, which contributes to improvement of lamination accuracy and product quality.

In a second aspect, referring to fig. 4, an embodiment of the present application further provides a cell manufacturing apparatus 1000. The embodiment of the application provides a system electric core device 1000, can utilize compound material area 1 to prepare the electric core, compound material area 1 includes diaphragm material area 1B and a plurality of pole piece group 1A of following the extending direction interval arrangement of diaphragm material area 1B. Understandably, each pole piece group 1A includes at least one pole piece, and the pole pieces are stacked in the thickness direction with the separator material tape 1B.

As an example (as shown in fig. 5), the composite material tape 1 includes a separator material tape 1B, and each of the pole piece groups 1A includes one pole piece, the pole pieces between every two adjacent pole piece groups 1A are located on opposite sides of the separator material tape 1B, one of the pole pieces is a first pole piece A1, the other pole piece is a second pole piece A2, and the polarities of the first pole piece A1 and the second pole piece A2 are opposite. As another example (as shown in fig. 6), the composite material tape 1 includes two layers of separator material tape 1B, each of the pole piece groups 1A includes a first pole piece A1 and a second pole piece A2, the first pole piece A1 being located at an outer layer of the composite material tape 1, the second pole piece A2 being located between the two layers of separator material tape 1B, the first pole piece A1 between each adjacent two pole piece groups 1A being located at opposite sides of the total separator material tape 1B. Regarding the specific type of composite strip 1, a person skilled in the art can make routine setups.

Referring to fig. 4, a battery cell manufacturing device 1000 according to an embodiment of the present application includes a lamination platform 400 and the pinching mechanism 100 according to any of the foregoing embodiments. Lamination stage 400 is located downstream of pinching mechanism 100. The pinching mechanism 100 is for performing a pinching operation on the composite material tape 1 to form a pinching portion G at a region of the composite material tape 1 between adjacent two pole piece groups 1A to output the laminated material tape 2, and the directions of arching of each of the adjacent two pinching portions G in the laminated material tape 2 are opposite. The cell manufacturing device 1000 can fold the laminated material strips 2 at each kneading part G in turn and fold the laminated material strips on the lamination platform 400 to form cells.

As can be appreciated, the region (which may be the region to be pinched) between the adjacent pole pieces 1A in the composite material tape 1 is the separator material tape 1B, and when the battery cell is prepared, the pinching assembly 10 performs pinching operation on the separator material tape 1B between each adjacent two pole pieces 1A on the composite material tape 1. Specifically, regardless of the number of layers of the separator material strips 1B, each pinching assembly 10 simultaneously pinching all the separator material strips 1B located in the region to be pinched when performing the pinching operation, forming a pinch portion G arched and pinched together by at least one separator material strip 1B.

In order to make the arch directions of the adjacent two kneading portions G opposite in the laminated material belt 2, the method described in the foregoing embodiment may be used, for example, the first kneading assembly 10A and the second kneading assembly 10B are used to knead the adjacent regions to be kneaded, which is not described herein in detail.

As understood from fig. 4, on the conveying path of the composite material tape 1, the composite material tape 1 is pinched by the pinching mechanism 100 to form a pinching portion G, the pinching mechanism 100 outputs the laminated material tape 2 having the pinching portion G, and then the battery cell manufacturing device 1000 sequentially bends the laminated material tape 2 around each pinching portion G, so that the laminated material tape 2 is Z-folded on the lamination platform 400 to form a battery cell.

After the pinching mechanism 100 outputs the laminated material strip 2, the laminated material may be folded at each pinching portion G under the action of gravity of the laminated material, and then Z-folded on the lamination platform 400. Alternatively, the cell manufacturing apparatus 1000 may include a stacking mechanism downstream of the pinching mechanism 100 for bending and laterally swinging the laminate tape 2 back and forth at each pinching portion G to Z-fold the laminate tape 2. Specifically, the stacking mechanism includes a stacking manipulator, where the stacking manipulator may clamp the laminated material strip 2 and swing the laminated material strip 2 to fold at the kneading portion G.

In practical application, the kneading mechanism 100 of the above-mentioned battery cell manufacturing device 1000 can knead the kneading portion G in the region between each two adjacent pole piece groups 1A on the composite material tape 1, and the arching directions of every two adjacent kneading portions G are opposite to obtain the laminated material tape 2, so that the laminated material can be folded at each kneading portion G, and Z-shaped folding of the laminated material is realized, thereby obtaining the battery cell. The existence of the kneading part G can ensure that the consistency of the folded angle positions is better, and the lamination precision and the lamination quality of the battery cell are higher.

In some embodiments, referring to fig. 4, the cell manufacturing device 1000 further includes a feeding mechanism 300 and a thermal compounding mechanism 500, where the feeding mechanism 300 is used to convey the separator material tape 1B and multiple sets of pole pieces to the thermal compounding mechanism 500. The thermal compounding mechanism 500 is used for thermally compounding the separator material tape 1B with each set of pole pieces to output the composite material tape 1.

The pole pieces and the diaphragm material belts 1B in the pole piece group 1A in the composite material belt 1 are arranged in a laminated mode, and in order to ensure that the pole pieces are in good contact with the diaphragm material belts 1B and maintain a position relationship, the pole pieces and the diaphragm material belts 1B are compounded together. At this time, the cell manufacturing device 1000 may compound the separator material tape 1B and the plurality of sets of pole pieces to obtain the composite material tape 1.

Specifically, the feeding mechanism 300 conveys the plurality of groups of pole pieces and the diaphragm material tape 1B which are not compounded together to the thermal compounding mechanism 500, and then the thermal compounding mechanism 500 thermally compounds the diaphragm material tape 1B and the groups of pole pieces, and the groups of pole pieces compounded with the diaphragm material tape 1B are used as a pole piece group 1A. The feeding mechanism 300 may include a conveying roller 301, and the conveying roller 301 conveys the separator material tape 1B along a conveying path. The feeding mechanism 300 may further include a pole piece placement robot that places each pole piece in the pole piece group 1A on the separator strip 1B or on the transport roller 301.

The thermal compounding mechanism 500 is used to thermally press the pole piece set 1A and the separator material tape 1B, and the specific configuration of the thermal compounding mechanism 500 can be conventionally set by those skilled in the art. Illustratively, the thermal compounding mechanism 500 includes at least one pair of press rolls 501 formed with a roll nip, and a heat generating structure may be provided on the press rolls 501 so that the press rolls 501 can thermally compound together the sheet and separator strip 1B passing through the roll nip. In other examples, the thermal compounding mechanism 500 may also include a thermal platen by which the pole piece set 1A and the separator strip 1B are thermally and compression compounded together.

At this time, the battery cell manufacturing device 1000 may further heat the composite pole piece and the diaphragm material tape 1B to form the composite material tape 1, so as to realize the preparation of the composite material tape 1.

In some embodiments, referring to fig. 4, the battery cell manufacturing apparatus 1000 further includes a cutter mechanism 200, wherein the cutter mechanism 200 is located downstream of the pinching mechanism 100 and upstream of the lamination stage 400. The cutter mechanism 200 includes a cutter portion 201 for cutting the laminated material web 2.

The cutter portion 201 includes at least one cutter. The cutter is typically movable and is capable of cutting the laminate strip 2 when moved. When the cutter portion 201 includes two cutters, the two cutters may be brought close to each other to cut the band L. The cutter can also be a laser cutter, an air knife or the like which does not need to be in contact with the laminated material strip 2. The specific configuration of the cutter portion 201 is not limited herein, and may be flexibly set by those skilled in the art.

In practical application, the pinching mechanism 100 continuously outputs the laminated material strips 2, and the laminated material strips 2 are continuously folded, so that the pole piece groups 1A are stacked layer by layer. After the battery cells with the N stacked pole piece groups 1A are prepared, the cutter mechanism 200 cuts off the battery cells from the connected unfolded laminated material strips 2, so that the battery cells are separated from the laminated material strips 2, and the battery cell preparing device 1000 can continuously prepare a plurality of battery cells, thereby greatly improving the production efficiency.

The portion to be cut by the cutter 201 is generally a region located between two adjacent pole piece groups 1A, and the region to be cut may be pinched to form the kneading portion G, may be arched to form the arched portion G, or may not form the arched portion G or the kneading portion G.

In some embodiments, referring to fig. 4, the cutter mechanism 200 includes a heat seal portion 202, and the heat seal portion 202 is used to heat seal the cut end of the laminate web 2 cut by the cutter portion 201.

The heat seal portion 202 may heat-press the cut end of the laminated material tape 2 so that the layers of materials at the cut end are connected together, and the layers of materials are tightly combined and connected, so that the structural stability of the laminated material tape 2 is maintained. As an example, the heat seal portion 202 includes a heat blowing portion for blowing hot air to the cut end to melt or soften the laminate web 2, and a nip plate for pinching the cut end to press-fit the softened laminate web 2. Regarding the specific configuration of the heat seal portion 202, a person skilled in the art can make a conventional arrangement.

At this time, the heat seal portion 202 can heat-seal the cut end of the laminated material web 2, improving the structural stability of the cut end of the laminated material web 2.

In a third aspect, referring to fig. 8, an embodiment of the present application further provides a method for manufacturing a battery cell, including:

S10, providing a composite material belt 1, wherein the composite material belt 1 comprises a diaphragm material belt 1B and a plurality of pole piece groups 1A which are arranged at intervals along the extending direction of the diaphragm material belt 1B;

s20, performing pinching operation on the composite material belt 1 to form a pinching part G in a region of the composite material belt 1 between two adjacent pole piece groups 1A so as to output a laminated material belt 2, wherein the arching direction of every two adjacent pinching parts G in the laminated material belt 2 is opposite;

and S30, sequentially folding the lamination material strips 2 at the kneading parts G to obtain a plurality of battery cells in which the pole piece groups 1A are stacked.

For the description of the composite tape 1, please refer to the above description, and the description is omitted here. In the composite material belt 1, the pole pieces of each pole piece group 1A are composited with the diaphragm material belt 1B.

The pole piece groups 1A of the composite material belt 1 are spaced, and the area between the adjacent pole piece groups 1A is called a blank area, and the blank area corresponds to the area of the to-be-pinched area mentioned above. In executing step S20, the kneading portion G may be formed by kneading all the blank-left regions on the composite tape 1, or the kneading portion G may be formed by kneading part of the blank-left regions on the composite tape 1 without kneading part of the blank-left regions. For example, when it is desired to cut the laminated web 2, the cut area may be an uncreped blank area between adjacent two pole piece groups 1A.

After the kneading operation is performed on the composite material tape 1, each laminated material tape 2 is obtained to include a plurality of kneading portions G arranged at intervals along the extending direction thereof, and the area between adjacent kneading portions G is the area where the pole piece group 1A is located.

In step S20, the composite material tape 1 may be conveyed to the kneading mechanism 100 of the battery cell manufacturing apparatus 1000, the kneading mechanism 100 kneading at the composite material tape 1 to form a plurality of kneading portions G, and the laminated material tape 2 having the plurality of kneading portions G and the adjacent kneading portions G having opposite arching directions may be output via the kneading mechanism 100.

In step S30, since the arching directions of every two adjacent kneading portions G in the laminated material tape 2 are opposite, the laminated material tape 2 can be folded at each kneading portion G, so that the laminated material tape 2 is folded in a Z-shape, and the battery cells in which the pole piece groups 1A are stacked are obtained. Specifically, after the pinching mechanism 100 outputs the laminate web 2, the laminate web 2 may be folded at each pinching portion G under the action of gravity to form a cell in a Z-shape. Alternatively, the laminated material strips 2 are folded in a Z-shape at the kneading sections G by the folding mechanism of the cell manufacturing device 1000 to form the cells.

According to the method for manufacturing the battery cell, the kneading parts G are kneaded in the areas of the composite material belt 1 between the adjacent pole piece groups 1A, so that the laminated material belt 2 with a plurality of kneading parts G and opposite arching directions of the adjacent kneading parts G is obtained, the folding angle positions of the battery cell are consistent in the process of Z-shaped folding of the laminated material belt 2 to obtain the battery cell, the lamination precision is high, and the battery cell quality is good.

In some embodiments, referring to fig. 9, step S10 of providing the composite tape 1 includes:

s11, providing a diaphragm material belt 1B and a plurality of groups of pole pieces which are arranged at intervals along the extending direction of the diaphragm material belt 1B;

s12, thermally compounding each group of pole pieces on the diaphragm material belt 1B to obtain a compound material belt 1.

In step S11, the separator strip 1B and the sets of pole pieces may be transported by the feeding mechanism 300. For example, the separator material tape 1B is guided to travel by the conveying roller 301 of the feeding mechanism 300, and each group of pole pieces is stacked on the separator material tape 1B by the pole piece discharging robot of the feeding mechanism 300.

In step S12, the separator material tape 1B and the respective sets of pole pieces may be thermally compounded by the thermal compounding mechanism 500. Specifically, the thermal compounding mechanism 500 includes a press roller 501 downstream of the conveying roller 301, and the two press rollers 501 are spaced to form a roll gap through which the separator material tape 1B can pass. When the diaphragm material belt 1B and the pole pieces of each group pass through the rolling gap, the diaphragm material belt and the pole pieces can be compounded together by hot pressing of a pressing roller 501.

Thus, the composite material belt 1 with good compounding of the pole piece and the diaphragm material belt 1B can be obtained.

In some embodiments, referring to fig. 9, after step S30 of folding the laminated material strip 2 at each kneading portion G in sequence to obtain a plurality of stacked battery cells of the pole piece group 1A, the method further includes:

S40, cutting off the connection between the unfolded lamination material belt 2 and the battery cell;

specifically, the pinching mechanism 100 continuously outputs the laminated material strips 2, and the laminated material strips 2 are continuously folded so that the pole piece groups 1A are stacked layer by layer. After preparing the battery cell having N stacked pole piece groups 1A, the cutter mechanism 200 cuts off the battery cell from the connected unfolded laminated material strips 2, so that the battery cell is separated from the laminated material strips 2. Specifically, the battery cell is connected with the unfolded laminated material belt 2 through a blank area, and the cutter mechanism 200 cuts off the blank area. The separator material strip in the blank area may be formed with a bulge, a pinch, or neither a bulge nor a pinch.

S50, heat-sealing the cut ends of the unfolded laminated material strips 2.

After the cutter portion 201 cuts the laminate web 2, the cut end cut by the cutter portion 201 may be heat-sealed by the heat-seal portion 202 of the cutter mechanism 200. Specifically, the cut ends of the laminated material strips 2 may be heated and pressurized by blowing heat with the hot air knife of the heat seal portion 202 and pressing the cut ends of the laminated material strips 2 so that the separator material strips 1B of the cut ends soften and fuse together to realize heat seal of the cut ends.

Therefore, the preparation of a plurality of battery cells can be realized on the same production line, and the production efficiency is higher.

In a further embodiment, after step S40, S60 may further include: the prepared cells are sequentially removed from lamination stage 400. Typically, one cell at a time is folded over the lamination stage 400. The cells may be removed from lamination stage 400 using a robot or the like.

In a fourth aspect, referring to fig. 7, the embodiment of the present application further provides a laminated material tape 2, which includes a membrane material tape 1B and a plurality of pole piece groups 1A disposed along an extending direction of the membrane material tape 1B at intervals, where pole pieces of each pole piece group 1A are stacked with the membrane material tape 1B. The region of the laminated material strip 2 between the adjacent two pole piece groups 1A is arched and kneaded in the thickness direction of the laminated material strip 2 to form kneading portions G arranged at intervals in the extending direction of the laminated material strip L, and the arching directions of the adjacent kneading portions G are opposite.

The separator material tape 1B refers to a tape-like material formed of a separator. The diaphragm is an important component for preparing the battery core, plays a role in separating the positive electrode from the negative electrode, preventing the internal short circuit of the battery core, allowing electrolyte ions to pass through freely and completing the electrochemical charging and discharging process, and the performance determines the interface structure, the internal resistance and the like of the battery, and directly influences the characteristics of the battery, such as capacity, circulation performance, safety performance and the like. The diaphragm can be made of polyethylene, polypropylene, polyimide and the like, and the specific materials can be selected conventionally.

The pole piece group 1A comprises at least one pole piece. When the pole piece group 1A only comprises one pole piece, the diaphragm material belt 1B only comprises one layer, and the pole pieces of the adjacent pole piece groups 1A are opposite in polarity and are arranged on two opposite sides of the diaphragm material belt 1B. When the pole piece group 1A includes two pole pieces (first pole piece A1 and second pole piece A2 having different polarities, the first pole piece A1 is one of the positive pole piece and the negative pole piece, the second pole piece A2 is the other of the positive pole piece and the negative pole piece), the separator material tape 1B may include two layers, each pole piece group 1A includes the second pole piece A2 located between the two layers of the separator material tape 1B, and the first pole piece A1 is disposed at the outer layer, and the first pole pieces A1 of the adjacent pole piece groups 1A are disposed at different sides of the lamination material tape 2. Regarding the specific configuration of each pole piece, one skilled in the art can make routine selections.

It is possible, but not limited to, that in the laminated material strip 2, at least a plurality of pole piece groups 1A adjacent in sequence include first pole pieces A1 located at the outer side layer of the laminated material strip 2, and the first pole pieces A1 of the adjacent pole piece groups 1A are arranged at opposite sides in the thickness direction of the laminated material strip 2. In this way, in the folded battery cell, the diaphragm, the first pole piece A1, the diaphragm and the second pole piece A2 are sequentially arranged. For the pole piece group 1A arranged at the bottom of the battery cell after folding, the pole piece group 1A may not include the first pole piece A1 located at the outer layer of the lamination material belt 2, so that during lamination, the pole piece of the bottom pole piece group 1A does not need to be considered to be scraped by the lamination platform 400, and the bad phenomenon of battery cell powder dropping is caused. Of course, it is conceivable to lay a protective cushion on the lamination stage 400, onto which the lamination material tape 2 is folded, with which the first pole piece A1 of the bottom pole piece group 1A located on the outer layer is protected from being scraped.

The number of pole pieces of each pole piece group 1A and the number of layers of the separator material tape 1B can be set according to conventional settings, as long as the battery cells can be formed by Z-folding.

According to the laminated material belt 2, the kneading parts G are formed by kneading the areas between the two adjacent pole piece groups 1A, and the arching directions of the adjacent kneading parts G are opposite, so that when in Z-shaped folding, the lamination material belt can be smoothly and quickly folded at each kneading part G to obtain the battery cells with basically consistent folding angle positions, thereby being beneficial to improving the lamination efficiency of the battery cells and improving the quality of the battery cells.

In some embodiments, as shown in fig. 7, the separator material strip 1B includes two layers, the pole piece group 1A includes a first pole piece A1 and a second pole piece A2, the second pole piece A2 is disposed between the two layers of the separator material strip 1B, the first pole piece A1 is disposed on an outer layer of the laminated material strip 2, the first pole pieces A1 of adjacent pole piece groups 1A are located on opposite sides of the laminated material strip 2, and all the separator material strips 1B located between the adjacent two pole piece groups 1A are arched and kneaded to form the kneading portion G. At this time, the kneading portion G between the adjacent two pole piece groups 1A is formed by the two layers of the separator material strips 1B together, and the strength of the kneading portion G is higher.

In some embodiments, the separator tapes 1B forming the kneading section G are adhered to each other. Specifically, the kneading assembly 10 can be heated by the heating element 20 in the process of performing the kneading operation on the kneading assembly 10, so that the diaphragm material strips 1B of the kneading portion G are bonded together by being heated and pressed together, and thus, the shaping effect of the kneading portion G formed by the diaphragm material strips 1B in the lamination process is better, which is beneficial to improving the lamination precision.

In a fifth aspect, the present embodiment also provides a battery cell formed by folding the laminate tape 2 of the above embodiment at each kneading portion G in sequence. Which has all the above-mentioned advantages.

According to the kneading mechanism 100, the battery cell manufacturing device 1000, the battery cell manufacturing method, the laminated material strips 2 and the battery cells, when the battery cells are produced, the kneading parts G can be kneaded at the folding angle positions of the laminated material strips 2 by using the kneading components 10 in the kneading mechanism 100, when the battery cells are laminated, the kneading parts G can be sequentially folded at the kneading parts G of the laminated material strips 2, the folding angle positions of the laminated material strips 2 are accurately positioned by using the kneading parts G, the lamination precision of the laminated material strips 2 is improved, and the battery cell quality is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (19)

1. A pinching mechanism (100), characterized by comprising:

at least one pinching assembly (10) disposed on a conveying path of the material tape (L), each pinching assembly (10) being configured to perform a pinching operation on the material tape (L) located on the conveying path, the pinching operation including forming an arch portion (G) on the material tape (L) that arches in a thickness direction (X) of the material tape (L), and pinching the arch portion (G) to form a pinching portion (G) on the material tape (L).

2. The pinching mechanism (100) according to claim 1, wherein the pinching assembly (10) comprises an arch band (11) and a kneading element (12), the kneading element (12) being formed with a kneading space (N);

the arch strip (11) is used for enabling the material strip (L) located in the conveying path to enter the kneading space (N) and form the arch part (G), and the kneading piece (12) is used for kneading the arch part (G) located in the kneading space (N) to form the kneading part (G).

3. Pinching mechanism (100) according to claim 2, wherein the arch band (11) is movably arranged and during movement the band (L) located in the conveying path is caused to enter the pinching space (N) to form the arch (g);

The kneading elements (12) comprise two kneading elements (12 c) which are arranged at intervals, the kneading space (N) is formed between the two kneading elements (12 c), the two kneading elements (12 c) can relatively move, and the size of the kneading space (N) can be adjusted in the moving process so as to knead the arched part (g) positioned in the kneading space (N).

4. A pinching mechanism (100) according to claim 3, wherein the arch band (11) comprises an arch band pressing lever which is movably arranged and which during movement can push the material web (L) located in the conveying path into the pinching space (N) to form the arch portion (g).

5. The pinching mechanism (100) according to claim 1, wherein the pinching assembly (10) comprises a heating member (20), the heating member (20) being provided to the pinching assembly (10) and configured to heat the pinching assembly (10) during the pinching operation performed by the pinching assembly (10).

6. The pinching mechanism (100) according to any one of claims 1 to 5, wherein all of the pinching assemblies (10) are configured to form a plurality of the pinching portions (G) on a web (L) that are arranged at intervals along an extending direction of the web (L), and wherein the directions of arching of every adjacent two of the pinching portions (G) are opposite.

7. The pinching mechanism (100) according to claim 6, wherein the at least one pinching assembly (10) comprises a first pinching assembly (10A) and a second pinching assembly (10B) that are arranged at intervals along the conveying path, both of which are formed on the web (L) with opposite arching directions of the pinching portion (G).

8. The pinching mechanism (100) according to any one of claims 1-5, wherein the pinching mechanism (100) further comprises a detecting member (30), the detecting member (30) is configured to obtain characteristic information of the material strip (L) located on the conveying path, and position a region to be pinched of the material strip (L) according to the characteristic information, and the pinching assembly (10) is configured to perform the pinching operation on the positioned region to be pinched.

9. A battery cell manufacturing device (1000), characterized in that the battery cell manufacturing device (1000) can manufacture a battery cell by using a composite material belt (1), wherein the composite material belt (1) comprises a diaphragm material belt (1B) and a plurality of pole piece groups (1A) which are arranged at intervals along the extending direction of the diaphragm material belt (1B);

the cell making apparatus (1000) comprising a lamination stage (400) and a pinching mechanism (100) of any of claims 1-8; the lamination stage (400) is located downstream of the pinching mechanism (100);

The kneading mechanism (100) is used for performing kneading operation on the composite material belt (1) to form the kneading parts (G) in the area of the composite material belt (1) between two adjacent pole piece groups (1A) so as to output laminated material belts (2), and the arch directions of the adjacent two kneading parts (G) in the laminated material belts (2) are opposite;

the battery cell manufacturing device (1000) can enable the lamination material strips (2) to be folded at the kneading parts (G) in sequence and folded on the lamination platform (400) to form battery cells.

10. The cell manufacturing device (1000) according to claim 9, wherein the cell manufacturing device (1000) further comprises a feeding mechanism (300) and a thermal compounding mechanism (500);

the feeding mechanism (300) is used for conveying the diaphragm material belt (1B) and a plurality of groups of pole pieces to the thermal compounding mechanism (500);

the thermal compounding mechanism (500) is used for thermally compounding the diaphragm material belt (1B) and each group of pole pieces so as to output the compound material belt (1).

11. The cell making apparatus (1000) according to claim 9, wherein the cell making apparatus (1000) further comprises a cutter mechanism (200), the cutter mechanism (200) being located downstream of the pinching mechanism (100) and arranged upstream of the lamination stage (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, wherein the cutter mechanism (200) further comprises a heat sealing portion (202), the heat sealing portion (202) being configured to heat seal a cut end of the laminate web (2) cut by the cutter portion (201).

13. A method of manufacturing a cell, comprising:

providing a composite strip (1); the composite material belt (1) comprises a diaphragm material belt (1B) and a plurality of pole piece groups (1A) which are arranged at intervals along the extending direction of the diaphragm material belt (1B);

performing a kneading operation on the composite material strip (1) to form kneading portions (G) in regions of the composite material strip (1) between adjacent two of the pole piece groups (1A) to output laminated material strips (2), and the directions of arching of each adjacent two of the kneading portions (G) in the laminated material strips (2) being opposite;

and folding the laminated material belt (2) at each kneading part (G) in turn to obtain a plurality of battery cells formed by stacking the pole piece groups (1A).

14. The method of manufacturing a cell according to claim 13, characterized in that the step of providing a composite strip (1) comprises:

providing a diaphragm material belt (1B) and a plurality of groups of pole pieces which are arranged at intervals along the extending direction of the diaphragm material belt (1B);

And thermally compounding each group of pole pieces on the diaphragm material belt (1B) to obtain the composite material belt (1).

15. The method for manufacturing a battery cell according to claim 13, wherein after folding the laminated material tape (2) at each kneading portion (G) in order to obtain a battery cell in which a plurality of the pole piece groups (1A) are laminated, comprising:

cutting off the connection between the unfolded lamination material belt (2) and the battery cell;

heat sealing the cut ends of the unfolded laminate web (2).

16. The laminated material belt (2) is characterized by comprising a diaphragm material belt (1B) and a plurality of pole piece groups (1A) which are arranged at intervals along the extending direction of the diaphragm material belt (1B), wherein pole pieces of each pole piece group (1A) are laminated with the diaphragm material belt (1B);

the laminated material strips (2) are arranged in the area between two adjacent pole piece groups (1A), arch and are kneaded along the thickness direction of the laminated material strips (2) to form a plurality of kneading parts (G) which are arranged at intervals along the extending direction of the laminated material strips (2), and the arch directions of the adjacent kneading parts (G) are opposite.

17. The laminated material web (2) according to claim 16, wherein the separator material web (1B) comprises two layers, the pole piece group (1A) comprising a first pole piece (A1) and a second pole piece (A2), the second pole piece (A2) being arranged between the two layers of the separator material web (1B), the first pole piece (A1) being arranged on an outer layer of the laminated material web (2), the first pole piece (A1) of an adjacent pole piece group (1A) being located on opposite sides of the laminated material web (2);

All the separator strips (1B) located between two adjacent pole piece groups (1A) are arched and kneaded to form the kneading portion (G).

18. Laminate web (2) according to claim 16, characterized in that the membrane webs (1B) forming the kneading section (G) are adhered to each other.

19. A cell, characterized in that it is formed by folding a laminate web (2) according to any one of claims 16-18 in succession at each of the kneading sections (G).