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 apparatus and method

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410205849.6, filed on February 26, 2024, entitled "Battery cell winding apparatus and method", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of battery manufacturing, and in particular to a battery cell winding apparatus and method. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like. Wound battery cells are a common type of battery. The wound battery cell manufacturing process is relatively simple, and at the same time, it can achieve high battery energy density and capacity, so it is widely used in various electronic devices and mobile power sources.

[0005] In the production process of the battery, the consistency of the winding apparatus winding the bare battery cell will affect the use performance of the battery. If the consistency of the bare battery cell is poor, it will reduce the available power and working time of the entire battery, accelerate the loss and shorten the life of some bare battery cells in the battery, and some bare battery cells in the battery are prone to overheating, and even safety hazards. Therefore, improving the consistency of bare battery cell production is one of the topics that the industry needs to research.

[0006] SUMMARY

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

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

[0009] The first aspect of the present disclosure provides an electrode core 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 and wind the first electrode sheet, the second electrode sheet and the separator unwound by the unwinding mechanism into a winding structure, and at least one layer of the separator is interposed between any adjacent first electrode sheet and second electrode sheet; and an electrode sheet cutting device comprising a cutting knife, an adjusting mechanism, the adjusting mechanism and the cutting knife are provided with a path for the first electrode sheet to pass through on the blade side of the cutting knife, the adjusting mechanism is configured to make the to-be-cut boundary area of the first electrode sheet opposite to the blade of the cutting knife, and the cutting knife is configured to cut the first electrode sheet at the to-be-cut boundary area; the adjusting mechanism comprises at least one movable roller and at least two positioning rollers, the positions of the at least two positioning rollers are fixed and distributed along a first direction, and the movable roller is configured to reciprocate along a second direction intersecting the first direction between adjacent positioning rollers, each positioning roller is arranged on one side of the first electrode sheet, and each movable roller is arranged on the other side of the first electrode sheet.

[0010] In the process of winding a bare electrode core using the electrode core winding device, the unwinding mechanism unwinds the first electrode sheet, the second electrode sheet and the separator, at the same time, the winding needle assembly overlaps and winds the first electrode sheet, the second electrode sheet and the separator unwound by the unwinding mechanism into a winding structure, and at the end of a winding cycle, the to-be-cut boundary area of the first electrode sheet is adjusted to be opposite to the blade of the cutting knife by the adjusting mechanism, so that the cutting knife can accurately cut the first electrode sheet at the to-be-cut boundary area, thereby making the lengths of the first electrode sheets of each formed bare electrode core consistent, improving the consistency of the bare electrode core and improving the use performance of the battery. The specific structure of the adjusting mechanism realizes the adjusting function of the adjusting mechanism on the position of the first electrode sheet. Moreover, the adjusting mechanism has a simple structure, low investment cost and simple operation.

[0011] In some embodiments, the adjusting mechanism further comprises a first driving member, the first driving member 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, realizes the mechanical driving of the movable roller, makes the adjustment of the adjusting mechanism on the first electrode sheet more convenient and fast, improves the efficiency of cutting the first electrode sheet, and thereby is conducive to improving the production efficiency of the battery.

[0013] In some embodiments, the electrode sheet cutting device further comprises a detector, the detector is used to detect whether the to-be-cut boundary area of the first electrode sheet is opposite to the blade.

[0014] The detector is provided, which realizes the automatic detection of the moving position of the to-be-cut boundary area and is conducive to improving the detection accuracy.

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

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

[0017] In some embodiments, the number of cutting knives is at least two, and the cutting knives are oppositely arranged across the path.

[0018] In this way, not only the efficiency of cutting the pole piece 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 cell, and further improving the use performance of the battery.

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

[0020] In this way, after cutting the first pole piece, the free end of the first pole piece on the upstream side of the cutting knife is short, which facilitates the next winding cycle.

[0021] In some embodiments, the pole piece cutting device further comprises a pole piece clamping roller set, which is used to clamp the first pole piece when the to-be-cut boundary region of the first pole piece is opposite to the cutting edge.

[0022] The pole piece clamping roller set can clamp the first pole piece to limit the position of the first pole piece, so that the relative state of the to-be-cut boundary region and the cutting edge is more accurately maintained, thereby improving the cutting accuracy, improving the consistency of each bare cell, and further improving the use performance of the battery.

[0023] In some embodiments, the unwinding mechanism comprises 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 comprises at least two winding needles, at least two winding needles can simultaneously wind at least two winding structures, and the adjustment mechanism is provided with at least two adjustment mechanisms, each of which is configured to adjust the first pole piece of each winding structure one by one.

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

[0025] In some embodiments, the winding needle assembly further comprises a winding needle mounting shaft, the winding needles are coaxially connected to the winding needle mounting shaft, and the at least two winding needles are sequentially and spacedly arranged along the axial direction of the winding needle mounting shaft and can rotate simultaneously with the rotation of the winding needle mounting shaft.

[0026] The at least two winding needles can rotate simultaneously with the rotation of the winding needle mounting shaft, so that the at least two winding structures are wound simultaneously, thereby improving the manufacturing efficiency of the bare battery cell. Moreover, only one winding needle mounting shaft needs to be driven to rotate to drive the two winding needles to rotate, thereby reducing the number of driving members and reducing the cost.

[0027] In some embodiments, the unwinding assembly comprises a first tab unwinding roller for unwinding the first tab, a second tab unwinding roller for unwinding the second tab, and an insulating member unwinding roller for unwinding the insulating member, and the first tab unwound by the first tab unwinding roller, the second tab unwound by the second tab unwinding roller, and the insulating member unwound by the insulating member unwinding roller are wound into one winding structure by one winding needle in the same unwinding assembly.

[0028] In this way, the unwinding assembly can unwind the first tab, the second tab, and the insulating member, and the structure of the unwinding assembly is simple and the cost is low.

[0029] In some embodiments, each winding needle can be transferred between a winding station and a tab cutting station, the winding needle is used to wind the winding structure when the winding needle is transferred to the winding station, and the first tab of the winding structure wound around the winding needle passes through the path on the blade side of the adjustment mechanism and the cutting knife when the winding needle is transferred to the tab cutting station, and is cut by the cutting knife at the to-be-cut boundary region.

[0030] The winding needle performs winding work at the winding station, and is transferred to the tab cutting station after winding is completed, and performs the work of cutting the first tab at the tab cutting station. At this time, the winding work of the next cycle starts at the winding station, that is, the winding work of adjacent cycles overlaps in production time, thereby improving the production efficiency of the bare battery cell.

[0031] In some embodiments, a first electrode sheet tension control mechanism is arranged between each of the first electrode sheet unwinding rollers and the winding needle assembly, and is configured to control the tension of the first electrode sheet unwound by the first electrode sheet unwinding roller; and / or a second electrode sheet tension control mechanism is arranged between each of the second electrode sheet unwinding rollers and the winding needle assembly, and is configured to control the tension of the second electrode sheet unwound by the second electrode sheet unwinding roller; and / or a separator tension control mechanism is arranged between each of the separator unwinding rollers and the winding needle assembly, and is configured to control the tension of the separator unwound by the separator unwinding roller.

[0032] In this way, the tension of the first electrode sheet, the second electrode sheet and the separator during winding can be controlled, thereby improving the uniformity of winding and the processing quality of the bare battery cell.

[0033] In some embodiments, a first electrode sheet deviation correction system is arranged between each of the first electrode sheet unwinding rollers and the winding needle assembly, and is configured to correct the position of the first electrode sheet unwound by the first electrode sheet unwinding roller in the winding axial direction of the first electrode sheet; and / or a second electrode sheet deviation correction system is arranged between each of the second electrode sheet unwinding rollers and the winding needle assembly, and is configured to correct the position of the second electrode sheet unwound by the second electrode sheet unwinding roller in the winding axial direction of the second electrode sheet; and / or a separator deviation correction system is arranged between each of the separator unwinding rollers and the winding needle assembly, and is configured to correct the position of the separator unwound by the separator unwinding roller in the winding axial direction of the separator.

[0034] In this way, the position of the first electrode sheet, the second electrode sheet and the separator in the winding axial direction during winding 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 and wind the first electrode sheet, the second electrode sheet and the separator unwound by the unwinding mechanism into a winding structure, and at least one layer of the separator is interposed between any adjacent first electrode sheet and second electrode sheet; and an electrode sheet cutting device comprising a cutting knife and an adjusting mechanism, the adjusting mechanism and the cutting edge side of the cutting knife are provided with a path for the first electrode sheet to pass through, the adjusting mechanism is configured to make the to-be-cut boundary region of the first electrode sheet opposite to the cutting edge of the cutting knife, and the cutting knife is configured to cut the first electrode sheet at the to-be-cut boundary region.

[0036] The battery cell winding method comprises:

[0037] a first pole piece, a second pole piece and a separator are unwound from the winding mechanism;

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

[0039] an adjusting step, the adjusting mechanism adjusts the to-be-cut interface region of the first pole piece to be opposite to the cutting edge;

[0040] a cutting step, the cutting knife cuts the first pole piece at the to-be-cut interface region;

[0041] The adjusting mechanism comprises at least one movable roller and at least two positioning rollers, the positions of the at least two positioning rollers are fixed and are distributed along a first direction, the movable roller is configured to reciprocate along a second direction intersecting the first direction between adjacent positioning rollers, each positioning roller is arranged on one side of the first pole piece, and each movable roller is arranged on the other side of the first pole piece.

[0042] The adjusting step comprises:

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

[0044] a positioning stopping step, when the to-be-cut interface region of the first pole piece is opposite to the cutting edge, the movable roller stops moving.

[0045] In the winding process, the position of the to-be-cut interface region is adjusted by the movement of the movable roller, when the to-be-cut interface region is opposite to the cutting edge, the movement of the movable roller is stopped to keep the to-be-cut interface region opposite to the cutting edge, so that the cutting knife can accurately cut the first pole piece at the to-be-cut interface region, thereby making the lengths of the first pole pieces of each formed bare cell consistent, improving the consistency of the bare cell and the use performance of the battery.

[0046] In some embodiments, the adjusting mechanism comprises a detector for detecting whether the to-be-cut interface region of the first pole piece is opposite to the cutting edge.

[0047] The positioning stopping step comprises:

[0048] a detecting positioning step, the detector detects whether the to-be-cut interface region is opposite to the cutting edge, and when opposite, the process proceeds to the stopping step, and when not opposite, the process proceeds to the moving step;

[0049] a stopping step, the movable roller stops moving.

[0050] When the detector detects that the first pole piece is not in the state of the cutting region being opposite to the blade, the movable roller continues to move, and when the detector detects that the first pole piece is in the state of the cutting region being opposite to the blade, the movable roller stops moving and keeps the state of the cutting region being opposite to the blade, so that the cutting knife can accurately cut the first pole piece at the cutting region.

[0051] In some embodiments, the pole piece cutting device further comprises a pole piece clamping roller set for clamping the first pole piece when the cutting region of the first pole piece is opposite to the blade;

[0052] The stop step and the cutting step further comprise:

[0053] The clamping step, the pole piece clamping roller set clamps the first pole piece with the cutting region opposite to the blade.

[0054] The pole piece clamping roller set can clamp the first pole piece to limit the position of the first pole piece, so that the relative state of the cutting region and the blade is more accurately kept, thereby improving the cutting accuracy, improving the consistency of each bare cell, and improving the use performance of the battery.

[0055] In some embodiments, the unwinding mechanism comprises 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 comprises at least two winding needles, and at least two winding needles can simultaneously wind at least two winding structures, and the adjusting mechanism is provided with at least two, each of which is configured to adjust the first pole piece of each winding structure one by one.

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

[0057] The winding step, at least two winding needles simultaneously wind at least two winding structures;

[0058] The adjusting step, at least two adjusting mechanisms simultaneously and one by one adjust the first pole piece of each winding structure;

[0059] The cutting step, the cutting knife simultaneously cuts at least two first pole pieces.

[0060] In this way, at least two winding structures can be wound at the same time, the winding efficiency is improved, and the adjusting mechanism can simultaneously adjust the first pole pieces of at least two winding structures, and the cutting knife can cut the adjusted at least two first pole pieces at the cutting region at one time, thereby improving the production efficiency of the bare cell while keeping the consistency of the bare cell.

[0061] Inventive Effects

[0062] Through the disclosure, an electrode core winding device and method capable of improving the consistency of bare electrode core production are provided. BRIEF DESCRIPTION OF DRAWINGS

[0063] 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 detailed description is made with reference to the accompanying drawings.

[0064] FIG. 1 is a front view of an electrode tab cutting device according to some embodiments of the disclosure;

[0065] FIG. 2 is a side view of an electrode tab cutting device according to some embodiments of the disclosure;

[0066] FIG. 3 is a structural schematic diagram of an electrode core winding device according to some embodiments of the disclosure;

[0067] FIG. 4 is a structural schematic diagram of a winding station of an electrode core winding device according to some embodiments of the disclosure;

[0068] FIG. 5 is a flowchart of an electrode core winding method according to some embodiments of the disclosure;

[0069] FIG. 6 is a flowchart of an adjustment step in an electrode core winding method according to some embodiments of the disclosure;

[0070] FIG. 7 is another flowchart of an adjustment step in an electrode core winding method according to some embodiments of the disclosure;

[0071] FIG. 8 is another flowchart of an electrode core winding method according to some embodiments of the disclosure.

[0072] BRIEF DESCRIPTION OF DRAWINGS

[0073] 1000 winding structure; 100 first electrode tab; 101 to-be-cut-off boundary region; 200 second electrode tab; 300 separator; 10 electrode tab cutting device; 1 adjustment mechanism; 11 movable roller; 12 positioning roller; 2 cutting knife; 3 detection camera; 4 electrode tab clamping roller set; 41 clamping roller; 201 first electrode tab unwinding roller; 202 second electrode tab unwinding roller; 203 separator unwinding roller; 301 winding needle; 302 winding needle mounting shaft; 401 first electrode tab tension control device; 402 second electrode tab tension control device; 403 separator tension control device; 501 first electrode tab deviation rectifying device; 502 second electrode tab deviation rectifying device; 60 second electrode tab 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 explicitly defined and limited otherwise, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0081] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical term "contacting" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two contacting objects without interaction force or contact between two contacting objects with interaction force.

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

[0083] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0084] The battery can include one or more battery cells. The battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after the battery cell is discharged.

[0085] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present disclosure are not limited thereto.

[0086] The battery cell includes a bare cell (sometimes referred to as "cell" for short), which includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector. The negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector. The separator is disposed between the positive electrode sheet and the negative electrode sheet.

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

[0088] The winding type bare cell manufacturing process is relatively simple, and at the same time, it can realize high battery energy density and capacity, so it is widely used in various electronic devices and mobile power supplies. In the production process of the battery, the consistency of the winding equipment winding the bare cell will affect the use performance of the battery. If the consistency of the bare cell is poor, it will reduce the available capacity and working time of the whole battery, accelerate the loss and shorten the life of some bare cells in the battery, and some bare cells in the battery are prone to overheating, and even safety hazards. Therefore, improving the consistency of the bare cell production is one of the topics that the industry needs to study.

[0089] At the end of the winding cycle of the battery cell winding equipment, the pole piece needs to be cut off at the cutting position of the blue glue of the pole piece. The inventor of the present disclosure notices that the existing battery cell winding equipment transfers the winding structure from the winding station to the pole piece cutting station at the end of the winding cycle, and cuts off the negative pole piece at the pole piece cutting station. The transfer process is easy to cause the cutting position blue glue of the negative pole piece to deviate from the blade of the cutting knife, and the cutting of the negative pole piece by the cutting knife is not accurate, thereby causing the length of the negative pole piece in the bare cell wound by the battery cell winding equipment to be inconsistent, affecting the production consistency of the bare cell.

[0090] The inventor of the present disclosure found that by adding an adjusting mechanism that can make the cutting position blue glue of the negative pole piece opposite the blade of the cutting knife in the battery cell winding equipment, at the end of the winding cycle of the battery cell winding equipment, the cutting position blue glue of the negative pole piece is adjusted to be opposite the blade of the cutting knife through the adjusting mechanism. In this way, the cutting knife can accurately cut the negative pole piece at the cutting position blue glue, so that the length of the negative pole piece of each formed bare cell is consistent, thereby improving the consistency of the bare cell and improving the use performance of the battery.

[0091] Based on such a design concept, the inventor of the present disclosure designs a battery cell winding equipment, which comprises a unwinding mechanism, a winding needle assembly and a pole piece cutting device. The pole piece cutting device comprises a cutting knife and an adjusting mechanism. The adjusting mechanism and the blade side of the cutting knife are provided with a path for the first pole piece to pass through. The adjusting mechanism is configured to make the to-be-cut interface region of the first pole piece opposite the blade. The cutting knife is configured to be able to cut the first pole piece at the to-be-cut interface region.

[0092] In the process of winding the bare cell using the battery cell winding equipment, since the cutting position blue glue of the negative pole piece can be made opposite the blade through the adjusting mechanism, the cutting knife can accurately cut the negative pole piece at the cutting position blue glue, so that the length of the negative pole piece of each formed bare cell is consistent, thereby improving the consistency of the bare cell and improving the use performance of the battery.

[0093] In the following, some embodiments of the present disclosure will be described in detail with reference to FIGS. 1-8.

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

[0095] In some embodiments of the present disclosure, a first direction, a second direction and a third direction are set for the purpose of illustration, and the first direction, the second direction and the third direction are directions intersecting with each other, and here, the directions intersecting with each other include directions perpendicular to each other. For the purpose of understanding the embodiments of the present disclosure, the embodiments shown in Figs. 1 to 4 are described by taking an example in which the first direction, the second direction and the third direction are directions perpendicular to each other, but it should be understood by those skilled in the art that the embodiments of the present disclosure are not limited to the case in which the three directions are perpendicular to each other. For the purpose of illustration, as shown by the arrows in Figs. 1, 2 and 4, the direction in which the arrow X is located is the first direction, the direction in which the arrow Y is located is the second direction, and the direction in which the arrow Z is located is the third direction.

[0096] As shown in Figs. 1 and 2, the embodiments of the present disclosure provide a battery cell winding device, which comprises a unwinding mechanism, a winding needle assembly and a pole piece cutting device 10, the unwinding mechanism is configured to unwind a first pole piece 100, a second pole piece 200 and a separator 300; the winding needle assembly is configured to overlap and wind the first pole piece 100, the second pole piece 200 and the separator 300 unwound by the unwinding mechanism into a winding structure 1000, and at least one layer of the separator 300 is interposed between any adjacent first pole piece 100 and second pole piece 200, the pole piece cutting device 10 comprises a cutting knife 2 and an adjusting mechanism 1, the adjusting mechanism 1 and the cutting edge side of the cutting knife 2 are provided with a path for the first pole piece 100 to pass through, the adjusting mechanism 1 is configured to make the to-be-cut boundary region 101 of the first pole piece 100 opposite to the cutting edge, and the cutting knife 2 is configured to cut the first pole piece 100 at the to-be-cut boundary region 101.

[0097] The first pole piece 100 can be a negative pole piece, the adjusting mechanism 1 can make the to-be-cut boundary region 101 of the negative pole piece opposite to the cutting edge, and the cutting knife 2 is configured to cut the negative pole piece at the to-be-cut boundary region 101.

[0098] The negative electrode sheet can include a negative current collector. As an example, the negative current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, or titanium, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, or the like. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like). In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0099] The first electrode sheet 100 can be a positive electrode sheet, and the adjustment mechanism 1 can bring the division region 101 to be cut of the positive electrode sheet to be opposed to the blade, and the cutting blade 2 can be configured to cut the positive electrode sheet at the division region 101 to be cut.

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

[0101] As an example, the positive current collector has two surfaces opposite in the thickness direction thereof, and the positive active material is provided on either one or both of the two opposite surfaces of the positive current collector.

[0102] As an example, the positive current collector can employ a metal foil or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, or titanium, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0103] As an example, the positive active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as a battery positive active material can also be used. These positive active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be 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 manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0104] In some embodiments, the positive current collector can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When the foamed metal is used as the positive electrode, the surface of the foamed metal can be free of positive active material, or can be provided with positive active material. As an example, the foamed metal can be filled or / and deposited with lithium source material, potassium metal or sodium metal, the lithium source material being lithium metal and / or lithium-rich material.

[0105] The separator 300 is a separator film. The present disclosure does not have a particular limitation on the type of separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be selected.

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

[0107] In some embodiments, the separator 300 is a solid-state electrolyte. The solid-state electrolyte is arranged between the positive electrode and the negative electrode, and simultaneously functions as ion transmission and separation of the positive electrode and the negative electrode.

[0108] The to-be-cut-off boundary region 101 includes a cut-off position of the negative electrode tab or the positive electrode tab. The cut-off position is a kind of tape material, which is pasted on the electrode tab in the battery production, and is used for marking or positioning the cutting position, so as to perform accurate cutting operation in the manufacturing step.

[0109] In the process of winding the bare cell using the cell winding equipment, the unwinding mechanism unwinds the first electrode tab 100, the second electrode tab 200 and the separator 300, and at the same time, the winding needle assembly overlaps and winds the first electrode tab 100, the second electrode tab 200 and the separator 300 unwound by the unwinding mechanism into a winding structure 1000. At the end of a winding cycle, the to-be-cut-off boundary region 101 of the first electrode tab 100 is adjusted to be opposite to the cutting edge of the cutting knife 2 by the adjusting mechanism 1. In this way, the cutting knife 2 can accurately cut the first electrode tab 100 at the to-be-cut-off boundary region 101, so that the lengths of the first electrode tabs 100 of the formed bare cells are consistent, and the consistency of the bare cells is improved, and the use performance of the battery is improved.

[0110] In some embodiments of the present disclosure, the adjusting 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 roller 11 is configured to reciprocate along a second direction intersecting the first direction between adjacent positioning rollers 12. Each positioning roller 12 is arranged on one side of the first electrode tab 100, and each movable roller 11 is arranged on the other side of the first electrode tab 100.

[0111] Exemplarily, the adjusting mechanism 1 comprises one movable roller 11 and two fixed rollers 12, the two fixed rollers 12 are fixed in position and are spaced apart along a first direction, the movable roller 11 is configured to reciprocate along a second direction intersecting the first direction between the two fixed rollers 12, the two fixed 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 fixed rollers 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 along the second direction towards the first pole piece 100, the first pole piece 100 is driven to move along the path on the blade side, thus the to-be-cut boundary region 101 can be moved to be opposite to the blade, when the to-be-cut boundary region and the blade are opposite, the movable roller 11 stops moving, and the state that the to-be-cut boundary region and the blade are opposite is maintained, at this time, the cutting knife 2 can cut the first pole piece 100 at the to-be-cut boundary region.

[0113] In this way, the adjusting function of the adjusting mechanism 1 on the position of the first pole piece 100 is realized. Moreover, the adjusting mechanism 1 has a simple structure, low investment cost, and simple operation.

[0114] In some embodiments of the present disclosure, the adjusting mechanism 1 further comprises a first driving member, the first driving member 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, realizing mechanical driving of the movable roller 11, so that the adjusting of the adjusting mechanism 1 on the first pole piece 100 is more convenient and fast, and the efficiency of cutting the first pole piece is improved, thereby being beneficial to improving the production efficiency of the battery.

[0117] In some embodiments of the present disclosure, the pole piece cutting device 10 comprises a detector, the detector is used to detect 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 to-be-cut boundary region 101 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 to-be-cut boundary region 101 of the first pole piece 100 is opposite to the blade, the movable roller 11 stops moving and maintains the state that the to-be-cut boundary region 101 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 to-be-cut boundary region 101.

[0119] The detector is arranged to realize automatic detection of the moving position of the to-be-cut boundary area 101, and is beneficial to improving the detection accuracy.

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

[0121] For example, the detector comprises an encoder, and the encoder and a driving system driving the winding of the first pole piece 100 are used in combination to realize accurate control and positioning of the position of the to-be-cut boundary area 101 of the first pole piece 100, thereby improving the detection accuracy.

[0122] For example, the detector comprises a detection camera 3, which determines whether the to-be-cut boundary area 101 of the first pole piece 100 is opposite to the cutting edge by photographing an image of a part of the first pole piece 100 opposite to the cutting edge and comparing the image with a pre-stored image.

[0123] For example, the detector comprises an encoder and a detection camera 3. The combination of the two detectors for detecting the position of the to-be-cut boundary area 101 further improves the detection accuracy.

[0124] As for the selection of the encoder and the detection camera 3, the present disclosure does not have a particular limitation as long as they are suitable for application to the pole piece cutting device 10, and they can be self-made or purchased from the market.

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

[0126] In some embodiments of the present disclosure, the number of cutting knives 2 is at least two, and the cutting knives 2 are oppositely arranged across the path.

[0127] For example, the number of cutting knives 2 is two, and the cutting knives 2 are oppositely arranged across the path.

[0128] During the cutting process, the opposite cutting knives 2 approach each other, and the cutting edges will respectively contact the opposite sides of the to-be-cut boundary area 101 of the first pole piece 100 during the approaching process. The cutting edges on the two sides cut the first pole piece 100 at the same time, thereby improving the cutting efficiency. Moreover, during the process from the contact between the cutting knives 2 and the to-be-cut boundary area 101 to the disconnection of the first pole piece 100, the to-be-cut boundary area 101 is clamped between the two cutting knives 2 and cannot move, so that the cutting knives 2 can accurately cut the first pole piece 100 at the to-be-cut boundary area 101.

[0129] In this way, not only the efficiency of the pole piece 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 cell and further improving the use performance of the battery.

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

[0131] In this way, after cutting the first pole piece 100, the free end of the first pole piece 100 on the upstream side of the cutting knife 2 is shorter, facilitating the next winding cycle.

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

[0133] The pole piece clamping roller set 4 can clamp the first pole piece 100 to define the position of the first pole piece 100, so that the relative state of the to-be-cut boundary region 101 and the cutting edge is more accurately maintained, thereby improving the cutting accuracy, improving the consistency of each bare cell, and further improving the use performance of the battery.

[0134] Illustratively, the pole piece clamping roller set 4 is arranged close to the cutting knife 2 and can well define the position of the first pole piece 100. The pole piece clamping roller set 4 can be arranged between the cutting knife 2 and the adjusting mechanism 1, or can be arranged on the side of the cutting knife 2 away from the adjusting mechanism 1.

[0135] In some embodiments of the present disclosure, the pole piece clamping roller set 4 comprises at least two clamping rollers 41, which are oppositely arranged across the first pole piece 100 and can approach or move away from each other under the action of a second driving member.

[0136] Illustratively, the pole piece clamping roller set 4 comprises two clamping rollers 41, which are oppositely arranged across the first pole piece 100 and can approach or move away from each other under the action of a 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 to-be-cut boundary region 101 and the cutting edge are opposite, the clamping rollers 41 on the opposite sides of the first pole piece 100 approach each other to clamp the first pole piece 100 and define the position of the first pole piece 100. In this way, the relative state of the to-be-cut boundary region 101 and the cutting edge is more accurately maintained, thereby improving the cutting accuracy, improving the consistency of each bare cell, and further improving the use performance of the battery.

[0139] In some embodiments of the present disclosure, the unwinding mechanism comprises at least two unwinding assemblies, each of which is used to unwind the first pole piece 100, the second pole piece 200 and the separator 300, the needle assembly comprises at least two needles 301, the at least two needles 301 can simultaneously wind at least two winding structures 1000, and the adjusting mechanism 1 is provided with at least two, each of which is used to adjust the first pole piece 100 of each winding structure 1000.

[0140] In this way, the battery cell winding device can simultaneously wind at least two winding structures 1000, improve the winding efficiency, and at least two adjusting mechanisms 1 can adjust the first pole piece 100 of at least two winding structures 1000 respectively, and the cutting knife 2 can cut off the adjusted at least two first pole pieces 100 at the to-be-cut-off boundary area 101 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 needle assembly further comprises a needle mounting shaft 302, the needle 301 is coaxially connected to the needle mounting shaft 302, the at least two needles 301 are sequentially and spaced apart along the axial direction of the needle mounting shaft 302, and can simultaneously rotate with the rotation of the needle mounting shaft 302.

[0142] It should be noted that the needle mounting shaft 302 extends along a third direction which intersects with the first direction and the second direction, therefore, the needle 301 extends along the third direction, and the first pole piece 100, the second pole piece 200 and the separator 300 rotate around the third direction, that is, the winding axis of the first pole piece 100, the second pole piece 200 and the separator 300 is the third direction.

[0143] The at least two needles 301 can simultaneously rotate with the rotation of the needle mounting shaft 302, thereby simultaneously winding at least two winding structures 1000, thereby improving the manufacturing efficiency of the bare battery cell. Moreover, only one needle mounting shaft 302 needs to be driven to rotate to drive two needles 301 to rotate, thereby reducing the number of driving members and reducing the cost.

[0144] In some embodiments of the present disclosure, the unwinding assembly comprises a first pole piece unwinding roller 201, a second pole piece unwinding roller 202 and a separator 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 separator unwinding roller 203 is used to unwind the separator 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 separator 300 unwound by the separator unwinding roller 203 are wound into one winding structure 1000 by one needle 301.

[0145] Thus, the functions of unwinding the first pole piece 100, the second pole piece 200 and the separator 300 are realized, and the structure of the unwinding assembly is simple and the cost is low.

[0146] It can be understood that in the winding structure 1000, the separator 300 is arranged between the first pole piece 100 and the second pole piece 200, and therefore two separator unwinding rollers 203 are arranged in the same unwinding assembly for respectively unwinding one separator 300.

[0147] It should be noted that each first pole piece unwinding roller 201, each second pole piece unwinding roller 202 and each separator unwinding roller 203 are connected with a driving member for driving the rotation thereof, so as to realize the functions of unwinding the first pole piece 100, the second pole piece 200 and the separator 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, and the winding needle 301 is used for winding the winding structure 1000 when the winding needle 301 is transferred to the winding station, and the first pole piece 100 of the winding structure 1000 wound on the winding needle 301 passes through the path on the blade side of the adjusting mechanism 1 and the cutting knife 2 when the winding needle 301 is transferred to the pole piece cutting station, and is cut at the cutting boundary region 101 by the pole piece cutting device 10.

[0149] The winding needle 301 performs the winding operation in the winding station, and after the winding is completed, the winding needle 301 is transferred to the pole piece cutting station to perform the operation of cutting the first pole piece 100, at this time, the winding operation of the next cycle starts in the winding station, that is, the winding operations of adjacent cycles have overlapping parts in production time, so that the production efficiency of the bare battery cell is improved.

[0150] In some embodiments of the present disclosure, the first pole piece 100 is a negative pole piece, the second pole piece 200 is a positive pole piece, and the battery cell winding equipment further comprises a second pole piece cutting device 60, which is used for cutting the second pole piece 200 of the winding structure 1000 located in the winding station.

[0151] Thus, when the winding cycle of the battery cell winding equipment is about to end, the second pole piece cutting device 60 cuts the positive pole piece, and then the winding structure 1000 is transferred from the winding station to the pole piece cutting station, so that the negative pole piece and the separator 300 which is overlapped and bonded with the negative pole piece enter the path on the blade side of the adjusting mechanism 1 and the cutting knife 2, and then the adjusting mechanism 1 adjusts the negative pole piece to be opposite to the cutting boundary region 101 and the blade, and the cutting knife 2 cuts the negative pole piece at the cutting boundary region 101.

[0152] In some embodiments of the present disclosure, a first pole piece tension control device 401 is arranged 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 arranged 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 a separator tension control device 403 is arranged between each separator unwinding roller 203 and the winding needle assembly, and the separator tension control device 403 is used to control the tension of the separator 300 unwound by the separator 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 winding can be controlled, thereby improving the uniformity of winding and improving the processing quality of the bare battery cell.

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

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

[0156] FIG. 5 is a flowchart of a battery cell winding method according to some embodiments of the present disclosure.

[0157] The embodiment of the present disclosure provides a winding method of an electric core, using a winding device of the electric core, the winding device of the electric core comprising: a unwinding mechanism configured to unwind a first pole piece 100, a second pole piece 200 and a separator 300; a winding needle assembly configured to overlap and wind the first pole piece 100, the second pole piece 200 and the separator 300 unwound by the unwinding mechanism into a winding structure 1000, and at least one layer of the separator 300 is arranged between any adjacent first pole piece 100 and second pole piece 200; and a pole piece cutting device 10 comprising a cutting knife 2 and an adjusting mechanism 1, a path for the first pole piece 100 to pass through is arranged on the side of the adjusting mechanism 1 and the cutting knife 2, the adjusting mechanism 1 is configured to make the to-be-cut boundary area 101 of the first pole piece 100 opposite to the cutting edge, and the cutting knife 2 is configured to cut the first pole piece 100 at the to-be-cut boundary area 101.

[0158] As shown in FIG. 5, the winding method of the electric core comprises:

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

[0160] S2, a 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, and stops winding after winding the winding structure.

[0161] S3, an adjusting step: the adjusting mechanism makes the to-be-cut boundary area of the first pole piece opposite to the cutting edge.

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

[0163] In the winding process, the to-be-cut boundary area 101 of the first pole piece 100 is adjusted to be opposite to the cutting edge of the cutting knife 2 through the adjusting mechanism 1, so that the cutting knife 2 can accurately cut the first pole piece 100 at the to-be-cut boundary area 101, so that the lengths of the first pole pieces 100 of the formed bare electric cores are consistent, the consistency of the bare electric core is improved, and the use performance of the battery is improved.

[0164] FIG. 6 is a flowchart of the adjusting step in the winding method of the electric core provided by some embodiments of the present disclosure; and FIG. 7 is another flowchart of the adjusting step in the winding method of the electric core provided by some embodiments of the present disclosure.

[0165] In some embodiments of the present disclosure, the adjusting mechanism 1 comprises 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 are distributed at intervals along a first direction, the movable roller 11 is configured to reciprocate along a second direction intersecting the first direction between adjacent positioning rollers 12, 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 FIG. 6, the adjusting step comprises:

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

[0168] S32, a positioning stopping step, when the to-be-cut boundary region of the first pole piece moves to be opposite to the blade, the movable roller stops moving.

[0169] First, the position of the to-be-cut boundary region 101 is adjusted by the movement of the movable roller 11, and when the to-be-cut boundary region 101 moves to be opposite to the blade, the movable roller 11 stops moving to keep the to-be-cut boundary region 101 opposite to the blade, so that the subsequent cutting knife 2 can accurately cut the to-be-cut boundary region 101, thereby improving the cutting accuracy.

[0170] In some embodiments of the present disclosure, the adjusting mechanism 1 comprises a detector configured to detect whether the to-be-cut boundary region 101 of the first pole piece 100 is opposite to the blade.

[0171] As shown in FIG. 7, the positioning stopping step comprises:

[0172] S321, a detecting positioning step, the detector detects whether the to-be-cut boundary region is opposite to the blade, and when it is opposite, it goes to the stopping step, and when it is not opposite, it goes to the moving step;

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

[0174] When the detector detects that the to-be-cut boundary region 101 of the first pole piece 100 is not opposite to the blade, the movable roller 11 continues to move, and when the detector detects that the to-be-cut boundary region 101 of the first pole piece 100 is opposite to the blade, the movable roller 11 stops moving to keep the to-be-cut boundary region 101 opposite to the blade, and 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 to-be-cut boundary region 101.

[0175] In this way, automatic detection of the moving position of the to-be-cut boundary region 101 is realized, which is conducive to improving the detection accuracy.

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

[0177] Between the stopping step and the cutting step, there is further:

[0178] S33, a clamping step, the pole piece clamping roller set clamps the first pole piece whose to-be-cut boundary region is opposite to the blade.

[0179] The pole piece clamping roller set 4 can clamp the first pole piece 100 to limit the position of the first pole piece 100, so that the relative state of the to-be-cut-off boundary area 101 and the cutting edge is more accurately maintained, thereby improving the cutting accuracy, improving the consistency of each bare battery cell, and further improving the use performance of the battery.

[0180] FIG. 8 is another flowchart of the battery cell winding method according to 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 separator 300, the winding needle assembly includes at least two winding needles 301, and the at least two winding needles 301 can simultaneously wind at least two winding structures 1000. The adjusting mechanism 1 is provided with at least two, and each adjusting mechanism 1 is configured to adjust the first pole piece 100 of each winding structure 1000 one by one.

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

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

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

[0185] S3, adjusting step: the at least two adjusting mechanisms simultaneously and one by one adjust the first pole pieces of the winding structures;

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

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

[0188] Hereinafter, specific examples of some embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0189] As a specific example, the cell winding device 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 separator (separator 300), the two winding needles 301 are used to wind the winding structure 1000 respectively, and each adjustment mechanism 1 is used to adjust the first electrode sheet 100 of each winding structure 1000 one by one, and the two first electrode sheets 100 adjusted by the two adjustment mechanisms 1 are cut off at the same time by the cutting knife 2.

[0190] In this way, the cell winding device can complete the winding process of two bare cells at a time, without affecting the single cell winding time, greatly improving the production efficiency of the bare cell winding process, reducing the production cost of a single bare cell, and adjusting the position of the negative electrode sheet cutting position blue glue relative to the cutting knife 2 through the adjustment mechanism 1. In this way, the cutting knife 2 can accurately cut the negative electrode sheet at the cutting position blue glue, so that the lengths of the negative electrode sheets of each formed bare cell are consistent, improving the consistency of the bare cell and improving the use performance of the battery.

[0191] The above embodiments are only used to illustrate the technical solutions of the present disclosure, but not limit them; although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the specification of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. Industrial applicability

[0192] The present disclosure discloses a cell winding device and method, the cell winding device includes an unwinding mechanism, a winding needle assembly, and an electrode sheet cutting device, the unwinding mechanism is configured to unwind a first electrode sheet, a second electrode sheet, and a separator; the winding needle assembly is configured to overlap and wind the first electrode sheet, the second electrode sheet, and the separator unwound by the unwinding mechanism into a winding structure, and at least one layer of separator is interposed between adjacent first electrode sheets and second electrode sheets. The electrode sheet cutting device includes a cutting knife and an adjustment mechanism, the adjustment mechanism and the cutting edge side of the cutting knife are provided with a path for the first electrode sheet to pass through, the adjustment mechanism is configured to make the to-be-cut boundary area of the first electrode sheet opposite to the cutting edge of the cutting knife, and the cutting knife is configured to cut the first electrode sheet at the to-be-cut boundary area. The adjustment mechanism of the cell winding device can adjust the to-be-cut boundary area to be opposite to the cutting edge of the cutting knife, and the cutting knife can accurately cut the first electrode sheet, improve the consistency of the bare cell, and improve the use 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 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; 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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