Cell winding apparatus and method

Abstract

Disclosed are a cell winding apparatus and method. The cell winding apparatus comprises an unwinding mechanism, a winding needle assembly, and an electrode sheet cutting-off device. The unwinding mechanism is configured to be capable of unwinding a first electrode sheet, a second electrode sheet, and a separator. The winding needle assembly is configured to be capable of overlapping the first electrode sheet, the second electrode sheet and the separator which are unwound by the unwinding mechanism and winding same into a wound structure, and at least one layer of separator is sandwiched between a first electrode sheet and a second electrode sheet adjacent to each other. The electrode sheet cutting-off device comprises a cutter and an adjusting mechanism; the adjusting mechanism and the cutter edge side of the cutter are provided with a path for the first electrode sheet to pass through; the adjusting mechanism is configured to enable a demarcated region to be cut off of the first electrode sheet to be opposite to the cutter edge of the cutter; and the cutter is configured to be capable of cutting off the first electrode sheet at said demarcated region. The adjusting mechanism of the cell winding apparatus can adjust a demarcated region to be cut off to be opposite to the cutter edge of the cutter, and the cutter can accurately cut off a first electrode sheet, thereby improving the consistency of bare cells, and improving the use performance of batteries.

Description

Battery cell winding equipment and method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application number 202410205849.6, application date February 26, 2024, and invention name “Battery Cell Winding Equipment and Method”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery manufacturing technology, and in particular to a battery cell winding device and method. Background Art

[0004] New energy batteries are increasingly being used in everyday life and industry. For example, battery-powered new energy vehicles are already widely used, and batteries are also increasingly being used in energy storage and other fields. Wound cells are a common type of battery. Their relatively simple manufacturing process, coupled with their ability to achieve high energy density and capacity, have led to their widespread use in various electronic devices and mobile power supplies.

[0005] During the battery production process, the consistency of bare cell winding by winding equipment can affect battery performance. Poor bare cell consistency reduces the battery's available power and operating time, accelerating the wear and tear of some bare cells and shortening their lifespan. Furthermore, some bare cells are prone to overheating, even posing safety risks. Therefore, improving the consistency of bare cell production is a topic of research in the industry.

[0006] Summary of the Invention

[0007] In order to solve the above technical problems, the present disclosure provides a battery cell winding device and method for improving the consistency of bare battery cell production.

[0008] The present disclosure is achieved through the following technical solutions.

[0009] A first aspect of the present disclosure provides a battery cell winding device, comprising: an unwinding mechanism configured to unwind a first electrode sheet, a second electrode sheet, and an isolating member; a winding needle assembly configured to overlap the first electrode sheet, the second electrode sheet, and the isolating member unwound by the unwinding mechanism and wind them into a wound structure, with at least one layer of the isolating member interposed between any adjacent first electrode sheet and second electrode sheet; and an electrode sheet cutting device comprising a cutting knife; an adjustment mechanism, wherein the adjustment mechanism and the blade side of the cutting knife are provided with a path for the first electrode sheet to pass through, the adjustment mechanism being configured to make a boundary area to be cut of the first electrode sheet opposite to the blade of the cutting knife, and the cutting knife being configured to cut the first electrode sheet at the boundary area to be cut; the adjustment mechanism comprising at least one movable roller and at least two positioning rollers, the positions of the at least two positioning rollers being fixed and spaced apart along a first direction, the movable rollers being configured to reciprocate between adjacent positioning rollers along a second direction intersecting the first direction, each positioning roller being provided on one side of the first electrode sheet, and each movable roller being provided on the other side of the first electrode sheet.

[0010] In the process of winding the bare battery cell using the battery cell winding equipment, the unwinding mechanism unwinds the first electrode piece, the second electrode piece and the separator. At the same time, the winding needle assembly overlaps the first electrode piece, the second electrode piece and the separator unwound by the unwinding mechanism and winds them into a winding structure. When a winding cycle is about to end, the boundary area to be cut of the first electrode piece is adjusted to be opposite to the blade of the cutting knife through the adjustment mechanism. In this way, the cutting knife can accurately cut the first electrode piece at the boundary area to be cut, so that the length of the first electrode piece of each formed bare battery cell is consistent, which improves the consistency of the bare battery cell and improves the performance of the battery. The specific structure of the adjustment mechanism realizes the function of the adjustment mechanism to adjust the position of the first electrode piece. Moreover, the adjustment mechanism has a simple structure, low investment cost, and simple operation.

[0011] In some embodiments, the adjustment mechanism further includes a first driving member, which is drivingly connected to the movable roller and can drive the movable roller to reciprocate in the second direction.

[0012] The first driving member is used to drive the movable roller to move, realizing mechanical drive of the movable roller, making the adjustment of the first pole piece by the adjustment mechanism more convenient and rapid, improving the efficiency of cutting the first pole piece, and thus being conducive to improving the production efficiency of the battery.

[0013] In some embodiments, the pole piece cutting device further includes a detector, and the detector is used to detect whether the boundary area to be cut of the first pole piece is opposite to the blade.

[0014] The setting of the detector realizes the automatic detection of the moving position of the boundary area to be cut, which is beneficial to improving the accuracy of the detection.

[0015] In some embodiments, the detector includes an encoder and / or a detection camera.

[0016] In this way, the detector can detect the position of the boundary area to be cut of the first pole piece, and the detection accuracy is high.

[0017] In some embodiments, there are at least two cutting blades, which are arranged opposite to each other across the path.

[0018] In this way, not only the efficiency of electrode cutting is improved, thereby improving the production efficiency of the battery, but also the accuracy of the cutting position is improved, thereby improving the consistency of each bare battery cell and further improving the performance of the battery.

[0019] In some embodiments, along the transport direction of the first pole piece, the cutting blade is upstream of the adjustment mechanism.

[0020] In this way, after the first pole piece is cut off, the free end of the first pole piece on the upstream side of the cutting knife is shorter, which is convenient for the next winding cycle.

[0021] In some embodiments, the pole piece cutting device further comprises a pole piece clamping roller assembly, and the pole piece clamping roller assembly is used to clamp the first pole piece when the boundary area to be cut of the first pole piece is opposite to the blade.

[0022] The pole piece clamping roller group can clamp the first pole piece to limit the position of the first pole piece. In this way, the relative state of the boundary area to be cut and the blade is maintained more accurately, thereby improving the accuracy of cutting, thereby improving the consistency of each bare battery cell, and further improving the performance of the battery.

[0023] In some embodiments, the unwinding mechanism includes at least two unwinding assemblies, each of which is used to unwind the first pole piece, the second pole piece and the isolation member. The winding needle assembly includes at least two winding needles, and at least two of the winding needles can simultaneously wind at least two of the winding structures. There are at least two adjustment mechanisms, and each of the adjustment mechanisms is configured to adjust the first pole piece of each winding structure one-to-one.

[0024] In this way, the battery cell winding equipment can wind at least two winding structures at the same time, thereby improving the winding efficiency. Moreover, at least two adjustment mechanisms can adjust the first pole pieces of at least two winding structures respectively, and the cutting knife can cut off the at least two adjusted first pole pieces at the boundary area to be cut at one time, thereby improving the production efficiency of the bare battery cell while maintaining the consistency of the bare battery cell.

[0025] In some embodiments, the winding needle assembly also includes a winding needle mounting shaft, the winding needle is coaxially connected to the winding needle mounting shaft, at least two of the winding needles are arranged in sequence along the axial direction of the winding needle mounting shaft, and can rotate simultaneously with the rotation of the winding needle mounting shaft.

[0026] At least two winding needles can rotate simultaneously with the rotation of the winding needle mounting shaft, thereby simultaneously winding at least two winding structures, thereby improving the manufacturing efficiency of bare battery cells. Moreover, only one winding needle mounting shaft needs to be driven to drive the rotation of both winding needles, reducing the number of driving components and reducing costs.

[0027] In some embodiments, the unwinding assembly includes: a first pole piece unwinding roller, used to unwind the first pole piece; a second pole piece unwinding roller, used to unwind the second pole piece; an isolation member unwinding roller, used to unwind the isolation member; in the same unwinding assembly, the first pole piece unwinded by the first pole piece unwinding roller, the second pole piece unwinded by the second pole piece unwinding roller, and the isolation member unwinded by the isolation member unwinding roller are wound into a winding structure by a winding needle.

[0028] In this way, the function of the unwinding assembly to unwind the first pole piece, the second pole piece and the separator is realized. Moreover, the unwinding assembly has a simple structure and low cost.

[0029] In some embodiments, each of the winding needles can be transferred between a winding station and a pole piece cutting station. When the winding needle is transferred to the winding station, it is used to wind the winding structure. When the winding needle is transferred to the pole piece cutting station, the first pole piece of the winding structure wound on the winding needle passes through the path of the adjustment mechanism and the blade side of the cutting knife, and is cut by the cutting knife at the boundary area to be cut.

[0030] The winding needle performs the winding operation at the winding station, and is transferred to the electrode cutting station after the winding is completed, where the first electrode is cut. At this time, the winding operation of the next cycle starts at the winding station, that is, the winding operations of adjacent cycles have overlapping parts in production time, thus improving the production efficiency of the bare battery cell.

[0031] In some embodiments, a first pole piece tension control mechanism is provided between each first pole piece unwinding roller and the winding needle assembly, and the first pole piece tension control mechanism is used to control the tension of the first pole piece unwound by the first pole piece unwinding roller; and / or, a second pole piece tension control mechanism is provided between each second pole piece unwinding roller and the winding needle assembly, and the second pole piece tension control mechanism is used to control the tension of the second pole piece unwound by the second pole piece unwinding roller; and / or, an isolation piece tension control mechanism is provided between each isolation piece unwinding roller and the winding needle assembly, and the isolation piece tension control mechanism is used to control the tension of the isolation piece unwound by the isolation piece unwinding roller.

[0032] In this way, the tension of the first pole piece, the second pole piece and the separator during the winding process can be controlled, thereby improving the balance of the winding and improving the processing quality of the bare battery cell.

[0033] In some embodiments, a first pole piece correction system is provided between each first pole piece unwinding roller and the winding needle assembly, and the first pole piece correction system is used to correct the position of the first pole piece unwound by the first pole piece unwinding roller in the winding axis direction of the first pole piece; and / or, a second pole piece correction system is provided between each second pole piece unwinding roller and the winding needle assembly, and the second pole piece correction system is used to correct the position of the second pole piece unwound by the second pole piece unwinding roller in the winding axis direction of the second pole piece; and / or, an isolation member correction system is provided between each isolation member unwinding roller and the winding needle assembly, and the isolation member correction system is used to correct the position of the isolation member unwound by the isolation member unwinding roller in the winding axis direction of the isolation member.

[0034] In this way, the positions of the first pole piece, the second pole piece and the separator in the winding axis direction during the winding process can be corrected, thereby eliminating the deviation of the winding structure and improving the uniformity and consistency of the bare battery cell.

[0035] A second aspect of the present disclosure provides a battery cell winding method, using a battery cell winding device, the battery cell winding device comprising: an unwinding mechanism configured to unwind a first electrode sheet, a second electrode sheet, and a separator; a winding needle assembly configured to overlap the first electrode sheet, the second electrode sheet, and the separator unwound by the unwinding mechanism and wind them into a wound structure, with at least one layer of the separator interposed between any adjacent first electrode sheet and second electrode sheet; and a electrode sheet cutting device comprising a cutting knife and an adjustment mechanism, wherein the adjustment mechanism and the blade side of the cutting knife are provided with a path for the first electrode sheet to pass through, the adjustment mechanism being configured to make a boundary region of the first electrode sheet to be cut opposite to the blade of the cutting knife, and the cutting knife being configured to cut the first electrode sheet at the boundary region to be cut;

[0036] The battery core winding method comprises:

[0037] an unwinding step, wherein the unwinding mechanism unwinds the first pole piece, the second pole piece and the separator;

[0038] a winding step, wherein the winding needle assembly winds the first pole piece, the second pole piece, and the separator into a winding structure according to a set number of turns and then stops winding;

[0039] an adjusting step, wherein the adjusting mechanism causes the boundary area of ​​the first pole piece to be cut to face the blade;

[0040] a cutting step, wherein the cutting blade cuts the first pole piece at the boundary area to be cut;

[0041] The adjustment mechanism includes at least one movable roller and at least two positioning rollers, wherein the positions of the at least two positioning rollers are fixed and spaced apart along a first direction, and the movable rollers are configured to be able to reciprocate between adjacent positioning rollers along a second direction intersecting the first direction, wherein each positioning roller is provided on one side of the first pole piece, and each movable roller is provided on the other side of the first pole piece;

[0042] The adjusting step comprises:

[0043] a moving step, wherein the movable roller moves along the second direction, driving the first pole piece to transmit along the path;

[0044] In the alignment stopping step, when the boundary area to be cut of the first pole piece moves to be opposite to the blade, the movable roller stops moving.

[0045] In the above-mentioned winding process, the position of the boundary area to be cut is first adjusted by moving the movable roller. When the boundary area to be cut moves to the point where the blade is opposite, the movable roller stops moving to keep the boundary area to be cut and the blade relative to each other. In this way, the cutting knife can accurately cut the first electrode piece at the boundary area to be cut, thereby making the length of the first electrode piece of each formed bare battery cell consistent, thereby improving the consistency of the bare battery cell and improving the performance of the battery.

[0046] In some embodiments, the adjustment mechanism includes a detector, the detector being used to detect whether the boundary area to be cut of the first pole piece is opposite to the blade;

[0047] The alignment stopping step comprises:

[0048] a detection step in which the detector detects whether the boundary area to be cut is opposite to the blade, and if so, the process proceeds to a stop step; otherwise, the process proceeds to a move step;

[0049] The stopping step is to stop the movable roller from moving.

[0050] When the detector detects that the boundary area to be cut of the first pole piece is not opposite to the blade, the movable roller continues to move. When the detector detects that the boundary area to be cut of the first pole piece is opposite to the blade, the movable roller stops moving and maintains the state that the boundary area to be cut is opposite to the blade. Then, when the cutting knife cuts the first pole piece, the cutting knife can accurately cut the first pole piece at the boundary area to be cut.

[0051] In some embodiments, the electrode cutting device further comprises an electrode clamping roller assembly, the electrode clamping roller assembly being configured to clamp the first electrode when the boundary region to be cut of the first electrode is opposite to the blade;

[0052] The step between the stopping step and the cutting step also includes:

[0053] In the clamping step, the pole piece clamping roller group clamps the first pole piece at the boundary area to be cut opposite to the blade.

[0054] The pole piece clamping roller group can clamp the first pole piece to limit the position of the first pole piece. In this way, the relative state of the boundary area to be cut and the blade is maintained more accurately, thereby improving the accuracy of cutting, thereby improving the consistency of each bare battery cell, and further improving the performance of the battery.

[0055] In some embodiments, the unwinding mechanism includes at least two unwinding assemblies, each of which is used to unwind the first pole piece, the second pole piece, and the separator; the winding needle assembly includes at least two winding needles, and the at least two winding needles can simultaneously wind at least two winding structures; at least two adjustment mechanisms are provided, and each adjustment mechanism is configured to adjust the first pole piece of each winding structure in a one-to-one correspondence;

[0056] In the unwinding step, each of the unwinding assemblies simultaneously unwinds the first pole piece, the second pole piece, and the separator;

[0057] In the winding step, at least two of the winding needles simultaneously wind at least two of the winding structures;

[0058] In the adjustment step, at least two of the adjustment mechanisms adjust the first pole pieces of the winding structures simultaneously and one-to-one;

[0059] In the cutting step, the cutting blade cuts at least two of the first pole pieces simultaneously.

[0060] In this way, at least two winding structures can be wound at the same time, which improves the winding efficiency. Moreover, the adjustment mechanism can adjust the first pole pieces of at least two winding structures at the same time, and the cutting knife can cut off the at least two adjusted first pole pieces at the boundary area to be cut at one time, thereby improving the production efficiency of the bare battery cell while maintaining the consistency of the bare battery cell.

[0061] Effects of the Invention

[0062] The present disclosure provides a battery cell winding device and method that can improve the production consistency of bare battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] 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 disclosure. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0064] FIG1 is a front view of a pole piece cutting device provided by some embodiments of the present disclosure;

[0065] FIG2 is a side view of a pole piece cutting device provided by some embodiments of the present disclosure;

[0066] FIG3 is a schematic structural diagram of a battery cell winding device provided in some embodiments of the present disclosure;

[0067] FIG4 is a schematic structural diagram of a winding station of a battery cell winding device provided by some embodiments of the present disclosure;

[0068] FIG5 is a flow chart of a battery cell winding method provided by some embodiments of the present disclosure;

[0069] FIG6 is a flow chart of an adjustment step in a battery cell winding method according to some embodiments of the present disclosure;

[0070] FIG7 is another flow chart of the adjustment step in the battery cell winding method provided by some embodiments of the present disclosure;

[0071] FIG8 is another flow chart of a battery cell winding method provided in some embodiments of the present disclosure.

[0072] Description of Reference Numerals

[0073] 1000 winding structure; 100 first pole piece; 101 boundary area to be cut; 200 second pole piece; 300 isolating member; 10 pole piece cutting device; 1 adjustment mechanism; 11 movable roller; 12 positioning roller; 2 cutting knife; 3 detection camera; 4 pole piece clamping roller group; 41 clamping roller; 201 first pole piece unwinding roller; 202 second pole piece unwinding roller; 203 isolating member unwinding roller; 301 winding needle; 302 winding needle mounting shaft; 401 first pole piece tension control device; 402 second pole piece tension control device; 403 isolating member tension control device; 501 first pole piece deviation correction device; 502 second pole piece deviation correction device; 60 second pole piece cutting device. DETAILED DESCRIPTION

[0074] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification of the present disclosure and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0076] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means at least two, unless otherwise specifically defined.

[0077] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0078] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0079] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0080] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0081] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0082] Hereinafter, the present disclosure will be described in detail.

[0083] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0084] The battery may include one or more battery cells. The battery cells may be secondary batteries, which are battery cells that can be recharged to activate the active materials after discharge and continue to be used.

[0085] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present disclosure.

[0086] A battery cell includes a bare cell (sometimes referred to as a "cell"), which includes a positive electrode sheet, a negative electrode sheet, and an insulator. The positive electrode sheet may include a positive electrode collector and a positive electrode active material arranged on at least one surface of the positive electrode collector. The negative electrode sheet may include a negative electrode collector and a negative electrode active material arranged on at least one surface of the negative electrode collector. The insulator is arranged between the positive electrode sheet and the negative electrode sheet.

[0087] The bare cell may include a wound structure in which the positive electrode sheet, the negative electrode sheet, and the separator are wound into the wound structure.

[0088] The manufacturing process for wound bare cells is relatively simple, while achieving high battery energy density and capacity. Therefore, they are widely used in various electronic devices and mobile power supplies. During the battery production process, the consistency of the bare cells wound by the winding equipment can affect the battery's performance. Poor bare cell consistency reduces the battery's usable power and operating time, accelerates the loss and shortens the lifespan of some bare cells, and can also make some bare cells susceptible to overheating, potentially posing a safety hazard. Therefore, improving the consistency of bare cell production is a topic of research importance in the industry.

[0089] When a winding cycle of the battery cell winding equipment is about to end, the electrode sheet needs to be cut at the blue glue at the cutting position of the electrode sheet. The inventors of the present disclosure noticed that when a winding cycle of the existing battery cell winding equipment is about to end, the wound structure is transferred from the winding station to the electrode sheet cutting station, and the negative electrode sheet is cut at the electrode sheet cutting station. This transfer process can easily cause the blue glue at the cutting position of the negative electrode sheet to be offset relative to the blade of the cutting knife, and the cutting knife does not cut the negative electrode sheet accurately, which makes the length of the negative electrode sheet in the bare battery cell wound by the battery cell winding equipment inconsistent, affecting the production consistency of the bare battery cell.

[0090] After research, the inventors of the present disclosure discovered that an adjustment mechanism is added to the battery cell winding equipment, which can make the blue glue at the cutting position of the negative electrode sheet face the blade of the cutting knife. When a winding cycle of the battery cell winding equipment is about to end, the blue glue at the cutting position of the negative electrode sheet is adjusted to face the blade of the cutting knife through the adjustment mechanism. In this way, the cutting knife can accurately cut the negative electrode sheet at the blue glue at the cutting position, so that the length of the negative electrode sheet of each formed bare battery cell is consistent, thereby improving the consistency of the bare battery cell and improving the performance of the battery.

[0091] Based on such a design concept, the inventor of the present invention designed a battery cell winding device, which includes a rewinding mechanism, a winding needle assembly and a pole piece cutting device. The pole piece cutting device includes a cutting knife and an adjustment mechanism. The adjustment mechanism and the blade side of the cutting knife are provided with a path for the first pole piece to pass through. The adjustment mechanism is configured to make the boundary area to be cut of the first pole piece opposite to the blade, and the cutting knife is configured to be able to cut the first pole piece at the boundary area to be cut.

[0092] During the process of winding the bare battery cells using the battery cell winding equipment, the blue glue at the cutting position of the negative electrode sheet can be made opposite to the blade through the adjustment mechanism. Therefore, the cutting knife can accurately cut the negative electrode sheet at the cutting position blue glue, so that the length of the negative electrode sheet of each formed bare battery cell is consistent, thereby improving the consistency of the bare battery cell and improving the performance of the battery.

[0093] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to FIG. 1 to FIG. 8 .

[0094] Figure 1 is a front view of a pole piece cutting device provided in some embodiments of the present disclosure; Figure 2 is a side view of a pole piece cutting device provided in some embodiments of the present disclosure; Figure 3 is a structural schematic diagram of a battery cell winding device provided in some embodiments of the present disclosure; Figure 4 is a structural schematic diagram of a winding station of a battery cell winding device provided in some embodiments of the present disclosure.

[0095] In some embodiments of the present disclosure, for ease of explanation, a first direction, a second direction, and a third direction are set. The first direction, the second direction, and the third direction are directions that intersect with each other. Here, intersecting with each other includes intersecting perpendicularly with each other. For ease of understanding the embodiments of the present disclosure, in the embodiments shown in Figures 1 to 4, the first direction, the second direction, and the third direction are directions that intersect with each other perpendicularly for illustration, but those skilled in the art should understand that the embodiments of the present disclosure are not limited to the case where the three directions intersect with each other perpendicularly. For ease of explanation, as shown by the arrows in Figures 1, 2, and 4, the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction.

[0096] As shown in Figures 1 and 2, an embodiment of the present disclosure provides a battery cell winding device, including a rewinding mechanism, a winding needle assembly and a pole piece cutting device 10. The rewinding mechanism is configured to rewind a first pole piece 100, a second pole piece 200 and an isolating member 300; the winding needle assembly is configured to overlap the first pole piece 100, the second pole piece 200 and the isolating member 300 unwound by the rewinding mechanism and wind them into a winding structure 1000, and at least one layer of isolating member 300 is sandwiched between any adjacent first pole pieces 100 and second pole pieces 200. The pole piece cutting device 10 includes a cutting knife 2 and an adjustment mechanism 1. The blade sides of the adjustment mechanism 1 and the cutting knife 2 are provided with a path for the first pole piece 100 to pass through. The adjustment mechanism 1 is configured to make the boundary area 101 to be cut of the first pole piece 100 opposite to the blade, and the cutting knife 2 is configured to cut the first pole piece 100 at the boundary area 101 to be cut.

[0097] The first electrode sheet 100 may be a negative electrode sheet. The adjustment mechanism 1 may enable the boundary region 101 of the negative electrode sheet to be cut to face the blade. The cutting blade 2 is configured to cut the negative electrode sheet at the boundary region 101 .

[0098] The negative electrode plate may include a negative electrode current collector. As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The foam metal may be nickel foam, copper foam, aluminum foam, or an alloy foam, etc. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0099] The first electrode sheet 100 may be a positive electrode sheet. The adjustment mechanism 1 may enable the boundary region 101 of the positive electrode sheet to be cut to face the blade. The cutting blade 2 is configured to cut the positive electrode sheet at the boundary region 101 .

[0100] The positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0101] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0102] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0103] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0104] In some embodiments, the positive electrode current collector may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0105] The separator 300 is a separator. The present disclosure has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0106] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0107] In some embodiments, the separator 300 is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and serves to transport ions and isolate the positive and negative electrodes.

[0108] The boundary region 101 to be cut includes the blue adhesive tape of the negative electrode or the positive electrode. The blue adhesive tape is a tape material that is applied to the electrode during battery production to mark or locate the cutting position, facilitating accurate cutting during the manufacturing process.

[0109] During the process of winding the bare battery cell using the battery cell winding equipment, the unwinding mechanism unwinds the first electrode sheet 100, the second electrode sheet 200 and the isolating member 300. At the same time, the winding needle assembly overlaps the first electrode sheet 100, the second electrode sheet 200 and the isolating member 300 unwound by the unwinding mechanism and winds them into a winding structure 1000. When a winding cycle is about to end, the boundary area 101 to be cut of the first electrode sheet 100 is adjusted to be opposite to the blade of the cutting knife 2 through the adjustment mechanism 1. In this way, the cutting knife 2 can accurately cut the first electrode sheet 100 at the boundary area 101 to be cut, so that the length of the first electrode sheet 100 of each formed bare battery cell is consistent, thereby improving the consistency of the bare battery cell and improving the performance of the battery.

[0110] In some embodiments of the present disclosure, the adjustment mechanism 1 includes at least one movable roller 11 and at least two positioning rollers 12. The positions of the at least two positioning rollers 12 are fixed and spaced apart along a first direction. The movable rollers 11 are configured to be able to move back and forth between adjacent positioning rollers 12 along a second direction intersecting the first direction. Each positioning roller 12 is arranged on one side of the first pole piece 100, and each movable roller 11 is arranged on the other side of the first pole piece 100.

[0111] Exemplarily, the adjustment mechanism 1 includes a movable roller 11 and two positioning rollers 12. The positions of the two positioning rollers 12 are fixed and spaced apart along a first direction. The movable roller 11 is configured to be able to move back and forth between the two positioning rollers 12 along a second direction intersecting the first direction. The two positioning rollers 12 are arranged on one side of the first pole piece 100, and the movable roller 11 is arranged on the other side of the first pole piece 100.

[0112] The positioning roller 12 and the movable roller 11 are respectively located on opposite sides of the first pole piece 100. Therefore, when the movable roller 11 moves toward the first pole piece 100 along the second direction, it drives the first pole piece 100 to be transmitted, and the first pole piece 100 moves along the path on the side of the blade. Therefore, the boundary area 101 to be cut can be moved to be opposite to the blade. When the boundary area to be cut and the blade are opposite to each other, the movable roller 11 stops moving and maintains the state in which the boundary area to be cut and the blade are opposite to each other. At this time, the cutting knife 2 can cut the first pole piece 100 at the boundary area to be cut.

[0113] In this way, the adjustment mechanism 1 realizes the function of adjusting the position of the first pole piece 100. Moreover, the adjustment mechanism 1 has a simple structure, low investment cost, and is easy to operate.

[0114] In some embodiments of the present disclosure, the adjustment mechanism 1 further includes a first driving member, which is drivingly connected to the movable roller 11 and can drive the movable roller 11 to reciprocate in the second direction.

[0115] The first driving member includes but is not limited to a motor. As a specific example, a servo motor can be used.

[0116] The first driving member is used to drive the movable roller 11 to move, thereby realizing mechanical drive of the movable roller 11, making the adjustment of the first pole piece 100 by the adjustment mechanism 1 more convenient and rapid, improving the efficiency of cutting the first pole piece, and thus facilitating improving the production efficiency of the battery.

[0117] In some embodiments of the present disclosure, the pole piece cutting device 10 includes a detector for detecting whether the to-be-cut boundary region 101 of the first pole piece 100 is opposite to the blade.

[0118] When the detector detects that the boundary area 101 to be cut of the first pole piece 100 is not opposite to the blade, the active roller 11 continues to move. When the detector detects that the boundary area 101 to be cut of the first pole piece 100 is opposite to the blade, the active roller 11 stops moving and maintains the state that the boundary area 101 to be cut is opposite to the blade. Then, when the cutting knife 2 cuts the first pole piece 100, the cutting knife 2 can accurately cut the first pole piece 100 at the boundary area 101 to be cut.

[0119] The setting of the detector realizes the automatic detection of the moving position of the boundary area 101 to be cut, which is conducive to improving the accuracy of the detection.

[0120] In some embodiments of the present disclosure, the detector includes an encoder and / or a detection camera 3 .

[0121] Exemplarily, the detector includes an encoder, which is used in combination with a drive system for driving the winding of the first pole piece 100 to achieve precise control and positioning of the position of the boundary area 101 to be cut of the first pole piece 100, thereby improving the accuracy of detection.

[0122] Exemplarily, the detector includes a detection camera 3, which takes an image of the portion of the first pole piece 100 opposite to the blade and determines whether the boundary area 101 to be cut of the first pole piece 100 is opposite to the blade by comparing the image with a pre-stored image.

[0123] Exemplarily, the detector includes an encoder and a detection camera 3. The two detectors are combined to detect the position of the boundary area to be cut 101, thereby further improving the accuracy of the detection.

[0124] Regarding the selection of the encoder and the detection camera 3, as long as they are suitable for application in the pole piece cutting device 10, the present disclosure has no particular limitation thereto, and they can be homemade or purchased from the market.

[0125] In this way, the detector can detect the position of the to-be-cut boundary region 101 of the first pole piece 100 , and the detection accuracy is high.

[0126] In some embodiments of the present disclosure, there are at least two cutting blades 2 , which are arranged opposite to each other across a path.

[0127] For example, there are two cutting blades 2 , which are arranged opposite to each other across the path.

[0128] During the cutting process, the relative cutting knives 2 approach each other, and the blades will respectively contact the opposite sides of the boundary area 101 to be cut of the first pole piece 100 during the approach process. The blades on both sides cut the first pole piece 100 at the same time, thereby improving the cutting efficiency. Moreover, in the process from the cutting knife 2 contacting the boundary area 101 to be cut to the first pole piece 100 being disconnected, the boundary area 101 to be cut is clamped between the cutting knives 2 on both sides and will not move. Therefore, the cutting knife 2 can accurately cut the first pole piece 100 at the boundary area 101 to be cut.

[0129] In this way, not only the efficiency of electrode cutting is improved, thereby improving the production efficiency of the battery, but also the accuracy of the cutting position is improved, thereby improving the consistency of each bare battery cell and further improving the performance of the battery.

[0130] In some embodiments of the present disclosure, along the transport direction of the first pole piece 100 , the cutting blade 2 is upstream of the adjustment mechanism 1 .

[0131] In this way, after the first pole piece 100 is cut off, the free end of the first pole piece 100 on the upstream side of the cutting blade 2 is shorter, which is convenient for the next winding cycle.

[0132] In some embodiments of the present disclosure, the pole piece cutting device 10 further includes a pole piece clamping roller assembly 4 , which is used to clamp the first pole piece 100 when the boundary region 101 to be cut of the first pole piece 100 is opposite to the blade.

[0133] The pole piece clamping roller group 4 can clamp the first pole piece 100 to limit the position of the first pole piece 100. In this way, the relative state of the boundary area 101 to be cut and the blade is maintained more accurately, thereby improving the accuracy of cutting, thereby improving the consistency of each bare battery cell, and further improving the performance of the battery.

[0134] Exemplarily, the pole piece clamping roller group 4 is set close to the cutting knife 2, which can well limit the position of the first pole piece 100. The pole piece clamping roller group 4 can be set between the cutting knife 2 and the adjustment mechanism 1, or on the side of the cutting knife 2 away from the adjustment mechanism 1.

[0135] In some embodiments of the present disclosure, the pole piece roller assembly 4 includes at least two rollers 41 , which are arranged opposite to each other with the first pole piece 100 interposed therebetween, and can move closer to or farther away from each other under the action of the second driving member.

[0136] Illustratively, the pole piece clamping roller set 4 includes two clamping rollers 41 , which are arranged opposite to each other with the first pole piece 100 interposed therebetween, and the two clamping rollers 41 can move closer to or farther away from each other under the action of the second driving member.

[0137] The second driving member includes but is not limited to a motor. As a specific example, a servo motor can be used.

[0138] When the boundary area 101 to be cut and the blade are relative to each other, the clamping rollers 41 on the opposite sides of the first pole piece 100 approach each other, clamp the first pole piece 100, and limit the position of the first pole piece 100. In this way, the relative state of the boundary area 101 to be cut and the blade is maintained more accurately, thereby improving the accuracy of cutting, thereby improving the consistency of each bare battery cell, and further improving the performance of the battery.

[0139] In some embodiments of the present disclosure, the unwinding mechanism includes at least two unwinding assemblies, each of which is used to unwind the first pole piece 100, the second pole piece 200 and the isolation piece 300. The winding needle assembly includes at least two winding needles 301, and at least two winding needles 301 can simultaneously wind at least two winding structures 1000. At least two adjustment mechanisms 1 are provided, and each adjustment mechanism 1 is configured to adjust the first pole piece 100 of each winding structure 1000 in a one-to-one correspondence.

[0140] In this way, the battery cell winding equipment can wind at least two winding structures 1000 at the same time, thereby improving the winding efficiency. Moreover, at least two adjustment mechanisms 1 can adjust the first pole pieces 100 of at least two winding structures 1000 respectively, and the cutting knife 2 can cut the at least two adjusted first pole pieces 100 at the boundary area 101 to be cut at one time, thereby improving the production efficiency of the bare battery cell while maintaining the consistency of the bare battery cell.

[0141] In some embodiments of the present disclosure, the winding needle assembly also includes a winding needle mounting shaft 302, the winding needle 301 is coaxially connected to the winding needle mounting shaft 302, and at least two winding needles 301 are arranged in sequence along the axial direction of the winding needle mounting shaft 302, and can rotate simultaneously with the rotation of the winding needle mounting shaft 302.

[0142] It should be noted that the winding needle mounting axis 302 extends along a third direction that intersects both the first direction and the second direction. Therefore, the winding needle 301 extends along the third direction, and the first pole piece 100, the second pole piece 200 and the insulating member 300 rotate around the third direction, that is, the winding axes of the first pole piece 100, the second pole piece 200 and the insulating member 300 are all in the third direction.

[0143] At least two winding pins 301 can rotate simultaneously with the rotation of the winding pin mounting shaft 302, thereby simultaneously winding at least two winding structures 1000, thereby improving the manufacturing efficiency of bare battery cells. Moreover, only one winding pin mounting shaft 302 needs to be driven to rotate to drive both winding pins 301, reducing the number of driving components and reducing costs.

[0144] In some embodiments of the present disclosure, the unwinding assembly includes a first pole piece unwinding roller 201, a second pole piece unwinding roller 202 and an isolation piece unwinding roller 203, the first pole piece unwinding roller 201 is used to unwind the first pole piece 100; the second pole piece unwinding roller 202 is used to unwind the second pole piece 200; the isolation piece unwinding roller 203 is used to unwind the isolation piece 300; in the same unwinding assembly, the first pole piece 100 unwound by the first pole piece unwinding roller 201, the second pole piece 200 unwound by the second pole piece unwinding roller 202 and the isolation piece 300 unwound by the isolation piece unwinding roller 203 are wound into a winding structure 1000 by a winding needle 301.

[0145] In this way, the function of the unwinding assembly to unwind the first pole piece 100 , the second pole piece 200 and the spacer 300 is achieved. Moreover, the unwinding assembly has a simple structure and low cost.

[0146] It is understandable that in the winding structure 1000 , an isolator 300 is provided between the first pole piece 100 and the second pole piece 200 . Therefore, two isolator unwinding rollers 203 are provided in the same unwinding assembly, each for unwinding one isolator 300 .

[0147] It should be noted that each first pole piece unwinding roller 201 , each second pole piece unwinding roller 202 and each isolating element unwinding roller 203 are connected to a driving member for driving them to rotate, so as to realize the function of unwinding the first pole piece 100 , the second pole piece 200 and the isolating element 300 .

[0148] In some embodiments of the present disclosure, each winding needle 301 can be transferred between the winding station and the pole piece cutting station. When the winding needle 301 is transferred to the winding station, it is used to wind the winding structure 1000. When the winding needle 301 is transferred to the pole piece cutting station, the first pole piece 100 of the winding structure 1000 wound on the winding needle 301 passes through the path of the blade side of the adjustment mechanism 1 and the cutting knife 2, and is cut at the boundary area 101 to be cut by the pole piece cutting device 10.

[0149] The winding needle 301 performs the winding operation at the winding station, and is transferred to the electrode cutting station after the winding is completed, where the first electrode 100 is cut. At this time, the winding operation of the next cycle starts at the winding station, that is, the winding operations of adjacent cycles have overlapping parts in production time, thereby improving the production efficiency of the bare battery cell.

[0150] In some embodiments of the present disclosure, the first electrode sheet 100 is a negative electrode sheet, the second electrode sheet 200 is a positive electrode sheet, and the battery cell winding equipment also includes a second electrode sheet cutting device 60, which is used to cut off the second electrode sheet 200 of the winding structure 1000 located at the winding station.

[0151] In this way, when a winding cycle of the battery cell winding equipment is about to end, the second electrode sheet cutting device 60 cuts off the positive electrode sheet, and then the winding structure 1000 is transferred from the winding station to the electrode sheet cutting station, so that the negative electrode sheet and the isolation member 300 overlapping and bonded to the negative electrode sheet enter the path of the blade side of the adjustment mechanism 1 and the cutting knife 2. After that, the adjustment mechanism 1 adjusts the negative electrode sheet to be opposite to the blade in the boundary area 101 to be cut, and the cutting knife 2 cuts off the negative electrode sheet at the boundary area 101 to be cut.

[0152] In some embodiments of the present disclosure, a first pole piece tension control device 401 is provided between each first pole piece unwinding roller 201 and the winding needle assembly, and the first pole piece tension control device 401 is used to control the tension of the first pole piece 100 unwound by the first pole piece unwinding roller 201; and / or, a second pole piece tension control device 402 is provided between each second pole piece unwinding roller 202 and the winding needle assembly, and the second pole piece tension control device 402 is used to control the tension of the second pole piece 200 unwound by the second pole piece unwinding roller 202; and / or, an isolation piece tension control device 403 is provided between each isolation piece unwinding roller 203 and the winding needle assembly, and the isolation piece tension control device 403 is used to control the tension of the isolation piece 300 unwound by the isolation piece unwinding roller 203.

[0153] In this way, the tension of the first pole piece 100 , the second pole piece 200 and the separator 300 during the winding process can be controlled, thereby improving the balance of the winding and improving the processing quality of the bare cell.

[0154] In some embodiments of the present disclosure, a first pole piece correction device 501 is provided between each first pole piece unwinding roller 201 and the winding needle assembly, and the first pole piece correction device 501 is used to correct the position of the first pole piece 100 unwound by the first pole piece unwinding roller 201 in the winding axis direction of the first pole piece 100; and / or, a second pole piece correction device 502 is provided between each second pole piece unwinding roller 202 and the winding needle assembly, and the second pole piece correction device 502 is used to correct the position of the second pole piece 200 unwound by the second pole piece unwinding roller 202 in the winding axis direction of the second pole piece 200; and / or, an isolation piece correction device is provided between each isolation piece unwinding roller 203 and the winding needle assembly, and the isolation piece correction device is used to correct the position of the isolation piece 300 unwound by the isolation piece unwinding roller 203 in the winding axis direction of the isolation piece 300.

[0155] In this way, the positions of the first pole piece 100, the second pole piece 200 and the separator 300 in the winding axis direction during the winding process can be corrected, thereby eliminating the deviation of the winding structure 1000 and improving the uniformity and consistency of the bare cell.

[0156] FIG5 is a flow chart of a battery cell winding method provided in some embodiments of the present disclosure.

[0157] An embodiment of the present disclosure provides a battery cell winding method using a battery cell winding device, the battery cell winding device including: a reeling mechanism configured to reel off a first electrode sheet 100, a second electrode sheet 200 and an isolating member 300; a winding needle assembly configured to overlap the first electrode sheet 100, the second electrode sheet 200 and the isolating member 300 unwound by the reeling mechanism and wind them into a winding structure 1000, with at least one layer of isolating member 300 sandwiched between any adjacent first electrode sheets 100 and second electrode sheets 200; and a electrode sheet cutting device 10, including a cutting knife 2 and an adjustment mechanism 1, wherein the blade sides of the adjustment mechanism 1 and the cutting knife 2 are provided with a path for the first electrode sheet 100 to pass through, the adjustment mechanism 1 is configured to make the boundary area 101 to be cut of the first electrode sheet 100 opposite to the blade, and the cutting knife 2 is configured to cut the first electrode sheet 100 at the boundary area 101 to be cut.

[0158] As shown in Figure 5, the battery cell winding method includes:

[0159] S1, unwinding step: the unwinding mechanism unwinds the first pole piece, the second pole piece and the separator.

[0160] S2, winding step: the winding needle assembly winds the first pole piece, the second pole piece and the separator according to a set number of turns to form a winding structure and then stops winding.

[0161] S3, adjustment step: adjusting the mechanism so that the boundary area to be cut of the first pole piece is opposite to the blade.

[0162] S4, cutting step: the cutting knife cuts the first pole piece at the boundary area to be cut.

[0163] During the above-mentioned winding process, the boundary area 101 to be cut of the first pole piece 100 is adjusted to be opposite to the blade of the cutting knife 2 through the adjustment mechanism 1. In this way, the cutting knife 2 can accurately cut the first pole piece 100 at the boundary area 101 to be cut, so that the length of the first pole piece 100 of each formed bare battery cell is consistent, thereby improving the consistency of the bare battery cell and improving the performance of the battery.

[0164] FIG6 is a flow chart of an adjustment step in a battery cell winding method according to some embodiments of the present disclosure; FIG7 is another flow chart of an adjustment step in a battery cell winding method according to some embodiments of the present disclosure.

[0165] In some embodiments of the present disclosure, the adjustment mechanism 1 includes at least one movable roller 11 and at least two positioning rollers 12. The positions of the at least two positioning rollers 12 are fixed and spaced apart along a first direction. The movable rollers 11 are configured to be able to move back and forth between adjacent positioning rollers 12 along a second direction intersecting the first direction. Each positioning roller 12 is arranged on one side of the first pole piece 100, and each movable roller 11 is arranged on the other side of the first pole piece 100.

[0166] As shown in Figure 6, the adjustment steps include:

[0167] S31, a moving step, wherein the movable roller moves along the second direction, driving the first pole piece to transmit along the path;

[0168] S32, an alignment stop step, when the boundary area of ​​the first pole piece to be cut moves to face the blade, the movable roller stops moving.

[0169] First, the position of the boundary area 101 to be cut is adjusted by moving the movable roller 11. When the boundary area 101 to be cut moves to the point where the blades are opposite, the movable roller 11 stops moving to keep the boundary area 101 to be cut and the blades opposite to each other, so that the subsequent cutting knife 2 can accurately cut the boundary area 101 to be cut, thereby improving the cutting accuracy.

[0170] In some embodiments of the present disclosure, the adjustment mechanism 1 includes a detector for detecting whether the to-be-cut boundary region 101 of the first pole piece 100 is opposite to the blade.

[0171] As shown in FIG7 , the alignment stop step includes:

[0172] S321, detection step: the detector detects whether the boundary area to be cut is opposite to the blade, and if so, the process proceeds to the stop step; otherwise, the process proceeds to the move step;

[0173] S322, stopping step: the movable roller stops moving.

[0174] When the detector detects that the boundary area 101 to be cut of the first pole piece 100 is not opposite to the blade, the movable roller 11 continues to move. When the detector detects that the boundary area 101 to be cut of the first pole piece 100 is opposite to the blade, the movable roller 11 stops moving and maintains the state that the boundary area 101 to be cut is opposite to the blade. Then, when the cutting knife 2 cuts the first pole piece 100, the cutting knife 2 can accurately cut the first pole piece 100 at the boundary area 101 to be cut.

[0175] In this way, the automatic detection of the moving position of the boundary area 101 to be cut is achieved, which is beneficial to improving the accuracy of the detection.

[0176] In some embodiments of the present disclosure, the pole piece cutting device 10 further includes a pole piece clamping roller assembly 4 , which is used to clamp the first pole piece 100 when the boundary region 101 to be cut of the first pole piece 100 is opposite to the blade.

[0177] Between the stop step and the cut-off step also include:

[0178] S33, clamping step: the pole piece clamping roller group clamps the first pole piece opposite to the blade in the boundary area to be cut.

[0179] The pole piece clamping roller group 4 can clamp the first pole piece 100 to limit the position of the first pole piece 100. In this way, the relative state of the boundary area 101 to be cut and the blade is maintained more accurately, thereby improving the accuracy of cutting, thereby improving the consistency of each bare battery cell, and further improving the performance of the battery.

[0180] FIG8 is another flow chart of a battery cell winding method provided in some embodiments of the present disclosure.

[0181] In some embodiments of the present disclosure, the unwinding mechanism includes at least two unwinding assemblies, each of which is used to unwind the first pole piece 100, the second pole piece 200 and the isolation piece 300. The winding needle assembly includes at least two winding needles 301, and at least two winding needles 301 can simultaneously wind at least two winding structures 1000. At least two adjustment mechanisms 1 are provided, and each adjustment mechanism 1 is configured to adjust the first pole piece 100 of each winding structure 1000 in a one-to-one correspondence.

[0182] As shown in Figure 8, the battery cell winding method includes:

[0183] S1, unwinding step: each unwinding assembly simultaneously unwinds its own first pole piece, second pole piece and separator;

[0184] S2, winding step: at least two winding needles simultaneously wind at least two winding structures;

[0185] S3, an adjustment step: at least two adjustment mechanisms adjust the first pole pieces of each winding structure simultaneously and one-to-one;

[0186] S4, cutting step: the cutting knife cuts at least two first pole pieces simultaneously.

[0187] In this way, at least two winding structures 1000 can be wound at the same time, which improves the winding efficiency. Moreover, the adjustment mechanism 1 can adjust the first pole pieces 100 of at least two winding structures 1000 at the same time, and the cutting knife 2 can cut the at least two adjusted first pole pieces 100 at the boundary area 101 to be cut at one time, thereby improving the production efficiency of the bare battery cell while maintaining the consistency of the bare battery cell.

[0188] Specific examples of some embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0189] As a specific example, the battery cell winding equipment includes two unwinding assemblies, two winding needles 301 and two adjustment mechanisms 1. Each unwinding assembly is used to unwind the negative electrode sheet (first electrode sheet 100), the positive electrode sheet (second electrode sheet 200) and the diaphragm (isolation member 300). The two winding needles 301 are used to wind the winding structures 1000 respectively. Each adjustment mechanism 1 is used to adjust the first electrode sheet 100 of each winding structure 1000 one by one. The two first electrode sheets 100 adjusted by the two adjustment mechanisms 1 are cut off simultaneously by the cutting knife 2.

[0190] In this way, two bare battery cells can be produced after a single winding process of a battery cell winding device is completed, and at the same time, the winding time of a single battery cell is not affected, which greatly improves the production efficiency of the bare battery cell winding process and reduces the production cost of a single bare battery cell. By adjusting the mechanism 1, the blue glue at the cutting position of the negative electrode sheet can be aligned with the cutting knife 2. In this way, the cutting knife 2 can accurately cut the negative electrode sheet at the cutting position blue glue, so that the length of the negative electrode sheet of each formed bare battery cell is consistent, thereby improving the consistency of the bare battery cell and improving the performance of the battery.

[0191] The above embodiments are intended only to illustrate the technical solutions of the present disclosure, and are not intended to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the various embodiments of the present disclosure, and are intended to be encompassed by the specification of the present disclosure. In particular, the various technical features described in the various embodiments may be combined in any manner, as long as there are no structural conflicts. Industrial Applicability

[0192] The present disclosure discloses a battery cell winding device and method. The battery cell winding device includes an unwinding mechanism, a winding needle assembly, and a pole piece cutting device. The unwinding mechanism is configured to unwind a first pole piece, a second pole piece, and an isolating member. The winding needle assembly is configured to overlap the first pole piece, the second pole piece, and the isolating member unwound by the unwinding mechanism and wind them into a winding structure. At least one layer of isolating member is sandwiched between adjacent first and second pole pieces. The pole piece cutting device includes a cutting knife and an adjustment mechanism. The blade side of the adjustment mechanism and the cutting knife is provided with a path for the first pole piece to pass through. The adjustment mechanism is configured to make the boundary area to be cut of the first pole piece opposite to the blade of the cutting knife. The cutting knife is configured to cut the first pole piece at the boundary area to be cut. The adjustment mechanism of the battery cell winding device can adjust the boundary area to be cut to be opposite to the blade of the cutting knife. The cutting knife can accurately cut the first pole piece, thereby improving the consistency of the bare battery cell and improving the performance of the battery.

Claims

1. A battery cell winding device comprising: an unwinding mechanism configured to unwind the first pole piece, the second pole piece, and the separator; a winding needle assembly configured to overlap and wind the first pole piece, the second pole piece, and the separator unwound by the unwinding mechanism into a wound structure, with at least one layer of the separator sandwiched between any adjacent first pole piece and second pole piece; and A pole piece cutting device includes a cutting blade and an adjustment mechanism. A path for the first pole piece to pass through is provided on the blade side of the adjustment mechanism and the cutting blade. The adjustment mechanism is configured to position a boundary region of the first pole piece to be cut opposite to the blade of the cutting blade. The cutting blade is configured to cut the first pole piece at the boundary region to be cut. The adjustment mechanism includes at least one movable roller and at least two positioning rollers, wherein the positions of the at least two positioning rollers are fixed and spaced apart along a first direction, and the movable roller is configured to be able to reciprocate between adjacent positioning rollers along a second direction intersecting the first direction. Each of the positioning rollers is arranged on one side of the first pole piece, and each of the movable rollers is arranged on the other side of the first pole piece.

2. The battery cell winding device according to claim 1, wherein: The adjustment mechanism further includes a first driving member, which is drivingly connected to the movable roller and can drive the movable roller to reciprocate in the second direction.

3. The battery core winding device according to claim 1 or 2, wherein: The pole piece cutting device further includes a detector, which is used to detect whether the boundary area to be cut of the first pole piece is opposite to the blade.

4. The battery cell winding device according to claim 3, wherein: The detector includes an encoder and / or a detection camera.

5. The battery cell winding device according to any one of claims 1 to 4, wherein: There are at least two cutting blades, which are arranged opposite to each other across the path.

6. The battery cell winding device according to any one of claims 1 to 5, wherein: Along the transport direction of the first pole piece, the cutting blade is upstream of the adjustment mechanism.

7. The battery cell winding device according to any one of claims 1 to 6, wherein: The pole piece cutting device further comprises a pole piece clamping roller assembly, which is used for clamping the first pole piece when the boundary area to be cut of the first pole piece is opposite to the blade.

8. The battery cell winding device according to any one of claims 1 to 7, wherein: The unwinding mechanism includes at least two unwinding assemblies, each of which is used to unwind the first pole piece, the second pole piece and the isolation member. The winding needle assembly includes at least two winding needles, and the at least two winding needles can simultaneously wind at least two winding structures. At least two adjustment mechanisms are provided, and each adjustment mechanism is configured to adjust the first pole piece of each winding structure in a one-to-one correspondence.

9. The battery cell winding device according to claim 8, wherein: The winding needle assembly also includes a winding needle mounting shaft, the winding needle is coaxially connected to the winding needle mounting shaft, at least two winding needles are arranged in sequence along the axial direction of the winding needle mounting shaft and can rotate simultaneously with the rotation of the winding needle mounting shaft.

10. The battery cell winding device according to claim 8 or 9, wherein: The unwinding assembly comprises: A first pole piece unwinding roller, used for unwinding the first pole piece; A second pole piece unwinding roller, used for unwinding the second pole piece; An isolating element unwinding roller, used for unwinding the isolating element; In the same unwinding assembly, the first pole piece unwound by the first pole piece unwinding roller, the second pole piece unwound by the second pole piece unwinding roller, and the isolating element unwound by the isolating element unwinding roller are wound into a winding structure through a winding needle.

11. The battery cell winding device according to any one of claims 8 to 10, wherein: Each of the winding needles can be transferred between the winding station and the pole piece cutting station. When the winding needle is transferred to the winding station, it is used to wind the winding structure. When the winding needle is transferred to the pole piece cutting station, the first pole piece of the winding structure wound on the winding needle passes through the path of the adjustment mechanism and the blade side of the cutting knife, and is cut by the cutting knife at the boundary area to be cut.

12. The battery cell winding device according to any one of claims 10 to 11, wherein: A first pole piece tension control mechanism is provided between each first pole piece unwinding roller and the winding needle assembly, and the first pole piece tension control mechanism is used to control the tension of the first pole piece unwound by the first pole piece unwinding roller; and / or A second pole piece tension control mechanism is provided between each second pole piece unwinding roller and the winding needle assembly, and the second pole piece tension control mechanism is used to control the tension of the second pole piece unwound by the second pole piece unwinding roller; and / or An isolator tension control mechanism is provided between each isolator unwinding roller and the winding needle assembly, and the isolator tension control mechanism is used to control the tension of the isolator unwound by the isolator unwinding roller.

13. The battery cell winding device according to any one of claims 10 to 12, wherein: A first pole piece deviation correction system is provided between each first pole piece unwinding roller and the winding needle assembly, and the first pole piece deviation correction system is used to correct the position of the first pole piece unwound by the first pole piece unwinding roller in the winding axis direction of the first pole piece; and / or A second pole piece deviation correction system is provided between each second pole piece unwinding roller and the winding needle assembly, and the second pole piece deviation correction system is used to correct the position of the second pole piece unwound by the second pole piece unwinding roller in the winding axis direction of the second pole piece; and / or An isolator deviation correction system is provided between each isolator unwinding roller and the winding needle assembly, and the isolator deviation correction system is used to correct the position of the isolator unwound by the isolator unwinding roller in the winding axis direction of the isolator.

14. A battery cell winding method using a battery cell winding device, the battery cell winding device comprising: an unwinding mechanism configured to unwind the first pole piece, the second pole piece, and the separator; a winding needle assembly configured to overlap and wind the first pole piece, the second pole piece, and the separator unwound by the unwinding mechanism into a wound structure, with at least one layer of the separator sandwiched between any adjacent first pole piece and second pole piece; and A pole piece cutting device includes a cutting blade and an adjustment mechanism, wherein the adjustment mechanism and the cutting blade are provided with a path for the first pole piece to pass through, the adjustment mechanism is configured to align a boundary region of the first pole piece to be cut with the cutting blade, and the cutting blade is configured to cut the first pole piece at the boundary region to be cut; The battery core winding method comprises: an unwinding step, wherein the unwinding mechanism unwinds the first pole piece, the second pole piece and the separator; a winding step, wherein the winding needle assembly winds the first pole piece, the second pole piece, and the separator into a winding structure according to a set number of turns and then stops winding; an adjusting step, wherein the adjusting mechanism causes the boundary area to be cut of the first pole piece to face the blade; a cutting step, wherein the cutting blade cuts the first pole piece at the boundary area to be cut; The adjustment mechanism includes at least one movable roller and at least two positioning rollers, wherein the positions of the at least two positioning rollers are fixed and spaced apart along a first direction, and the movable roller is configured to be able to move between adjacent positioning rollers along a second direction intersecting the first direction. Reciprocating movement, each of the positioning rollers is arranged on one side of the first pole piece, and each of the movable rollers is arranged on the other side of the first pole piece; The adjusting step comprises: a moving step, wherein the movable roller moves along the second direction, driving the first pole piece to transmit along the path; In the alignment stopping step, when the boundary area to be cut of the first pole piece moves to be opposite to the blade, the movable roller stops moving.

15. The battery core winding method according to claim 14, wherein: The adjustment mechanism includes a detector, which is used to detect whether the boundary area to be cut of the first pole piece is opposite to the blade; The alignment stopping step comprises: a detection step in which the detector detects whether the boundary area to be cut is opposite to the blade, and if so, the process proceeds to a stop step; otherwise, the process proceeds to a move step; The stopping step is to stop the movable roller from moving.

16. The battery cell winding method according to claim 15, wherein: The electrode cutting device further comprises an electrode clamping roller assembly, the electrode clamping roller assembly being used to clamp the first electrode when the boundary area to be cut of the first electrode is opposite to the blade; The step between the stopping step and the cutting step also includes: In the clamping step, the pole piece clamping roller group clamps the first pole piece at the boundary area to be cut opposite to the blade.

17. The battery core winding method according to any one of claims 14 to 16, wherein: The unwinding mechanism includes at least two unwinding assemblies, each of which is used to unwind the first pole piece, the second pole piece, and the separator. The winding needle assembly includes at least two winding needles, and the at least two winding needles can simultaneously wind at least two winding structures. At least two adjustment mechanisms are provided, and each adjustment mechanism is configured to adjust the first pole piece of each winding structure in a one-to-one correspondence. In the unwinding step, each of the unwinding assemblies simultaneously unwinds the first pole piece, the second pole piece, and the separator; In the winding step, at least two of the winding needles simultaneously wind at least two of the winding structures; In the adjustment step, at least two of the adjustment mechanisms adjust the first pole pieces of the winding structures simultaneously and one-to-one; In the cutting step, the cutting blade cuts at least two of the first pole pieces simultaneously.

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