Winding device and battery cell production method

Abstract

The invention discloses winding equipment and a production method of a battery monomer, the winding equipment is used for producing an electrode assembly, and the winding equipment comprises a first unwinding mechanism used for unwinding a cathode plate, a first diaphragm and an anode plate; the second unwinding mechanism is used for unwinding a second diaphragm; the compounding mechanism is arranged at the downstream of the first unwinding mechanism and is used for compounding the cathode pole piece, a first diaphragm and the anode pole piece to form a composite piece, and the first diaphragm is positioned between the anode pole piece and the cathode pole piece; the edge sealing mechanism is arranged at the downstream of the compounding mechanism and the second unwinding mechanism and is used for carrying out edge sealing connection on the edge of the second diaphragm and the edge of the first diaphragm of the composite sheet so as to obtain an unwound electrode assembly; and the winding mechanism is arranged at the downstream of the edge sealing mechanism and is used for winding the unwound electrode assembly. According to the technical scheme, continuous unwinding of the second diaphragm can be achieved, the risk that the anode pole piece is in lap joint with the cathode pole piece and the shell of the battery single body is reduced, and the conveying stability is improved.

Description

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202410557506.6, filed on 2024-05-07, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a winding device and a method for producing battery cells. Background Technology

[0004] In the production process of electrode assemblies, the anode electrode, cathode electrode, and separator are bonded together and then wound to obtain the electrode assembly. In related technologies, during the production process, the separator is prone to folding or shifting, which can lead to short circuits due to overlap between the anode and cathode electrodes, or corrosion and leakage due to overlap between the anode electrode and the battery cell casing. Summary of the Invention

[0005] This application provides a winding device and a method for producing battery cells, which can reduce the possibility of the first and second separators folding or shifting, making it less likely for the anode electrode to overlap with the cathode electrode or the battery cell casing, thereby reducing the risk of short circuits and corrosion.

[0006] This application provides a winding device, comprising: a first unwinding mechanism for unwinding a cathode electrode, a first diaphragm, and an anode electrode; a second unwinding mechanism for unwinding a second diaphragm; a composite mechanism located downstream of the first unwinding mechanism for compositing the cathode electrode, the first diaphragm, and the anode electrode to form a composite sheet, wherein the first diaphragm is located between the anode electrode and the cathode electrode; an edge-sealing mechanism located downstream of the composite mechanism and the second unwinding mechanism for sealing the edge of the second diaphragm to the edge of the first diaphragm of the composite sheet to obtain an unwound electrode assembly; and a winding mechanism located downstream of the edge-sealing mechanism for winding the unwound electrode assembly.

[0007] In the technical scheme, the composite mechanism can prevent the cathode tab, the first diaphragm and the anode tab from deviating during the conveying process, the edge sealing mechanism can wrap the anode tab with the first diaphragm and the second diaphragm, the second unwinding mechanism can prevent the unwinding of the second diaphragm from being affected by the upstream material cutting and defect removal process, and the continuous unwinding of the second diaphragm can be realized, so that the second diaphragm can be wrapped around the anode tab at the head and tail to better wrap the anode tab, the anode tab is less likely to be exposed to reduce the risk of the anode tab being connected with the cathode tab and the shell of the battery cell, and the plurality of electrode assemblies can be connected by the second diaphragm during the conveying process to improve the stability of the conveying and the consistency of the plurality of electrode assemblies 200 after being wound and formed.

[0008] In some embodiments, the winding device further comprises a first detection mechanism, which is arranged downstream of the composite mechanism and is used at least for detecting a composite state.

[0009] In the technical scheme, the first detection mechanism can detect the composite state to achieve more comprehensive detection, avoid defects being shielded and not accurately detected after the cathode tab, the first diaphragm, the anode tab and the second diaphragm are laminated to form the electrode assembly, improve the detection accuracy, and thus reduce the risk of defects being missed in the production process of the electrode assembly.

[0010] In some embodiments, the composite state includes a state of the anode tab and the first diaphragm.

[0011] In the technical scheme, the first detection mechanism can be used to detect whether the width of the active material layer of the anode tab meets the set range after the composite and before the edge sealing, whether the anode tab and the first diaphragm have defects such as compression injury and other composite defects so as to be found and removed in time, and whether the relative position of the anode tab and the first diaphragm is accurate, for example, the two sides of the first diaphragm in the width direction and the length direction can exceed the edge of the anode tab by a sufficient size to facilitate subsequent edge sealing processing and reduce the risk of the anode tab being connected with the cathode tab.

[0012] In some embodiments, the winding device further comprises a second detection mechanism, which is arranged downstream of the edge sealing mechanism and is used at least for detecting an edge sealing state.

[0013] In the technical scheme, the second detection mechanism can detect the edge sealing state such as the tab corner, the head and tail wrinkling, the diaphragm misalignment and the like after the cathode tab, the first diaphragm, the anode tab and the second diaphragm are laminated and the diaphragm is edge sealed to form the electrode assembly, which can achieve more comprehensive detection, improve the reliability of the edge sealing connection, and reduce the risk of defects being missed in the production process of the electrode assembly.

[0014] In some embodiments, the second detection mechanism is further configured to detect the relative position of the cathode electrode tab and the anode electrode tab, the relative position of the first separator and the cathode electrode tab, and the relative position of the second separator and the anode electrode tab.

[0015] In the above technical solution, the second detection mechanism can detect whether the relative position of the cathode electrode tab and the first separator after the edge sealing of the separator is accurate, and whether the relative position of the anode electrode tab and the second separator is accurate, thereby improving the position accuracy of the cathode electrode tab, the first separator, the anode electrode tab, and the second separator. The second detection mechanism can also detect whether the two sides of the separator in the width direction and the length direction can exceed the edge of the electrode tab by a sufficient size, thereby providing sufficient space for edge sealing and improving the effect of separating the anode electrode tab and the cathode electrode tab by the separator.

[0016] In some embodiments, the first unwinding mechanism includes a cathode unwinding mechanism configured to unwind the cathode electrode tab, and the winding device further includes a third detection mechanism disposed between the cathode unwinding mechanism and the compounding mechanism and configured to detect the state of the cathode electrode tab.

[0017] In the above technical solution, the third detection mechanism detects the state of the cathode electrode tab before compounding by the compounding mechanism, so that the part of the cathode electrode tab with defects can be found and removed in time, thereby improving the quality of the cathode electrode tab for the electrode assembly.

[0018] In some embodiments, the third detection mechanism is disposed on the side of the cathode electrode tab facing the first separator and is configured to detect the state of the side of the cathode electrode tab facing the first separator, and the second detection mechanism is configured to detect the state of the side of the cathode electrode tab facing away from the first separator.

[0019] In the above technical solution, the third detection mechanism detects the state of the side of the cathode electrode tab facing the first separator before compounding of the cathode electrode tab, so that the defects on the side of the cathode electrode tab facing the first separator after compounding are not shielded and cannot be accurately detected. In combination with the detection of the state of the side of the cathode electrode tab facing away from the first separator by the second detection mechanism disposed downstream of the compounding mechanism, the states of the two sides of the cathode electrode tab in the thickness direction are detected, thereby improving the detection accuracy and reducing the risk of defect leakage in the production process of the electrode assembly. In addition, one detector is saved at the third detection mechanism, which is more economical.

[0020] In some embodiments, the active material layer of the cathode electrode tab includes a first film region and a second film region, the second film region is located on the side of the first film region close to the tab of the cathode electrode tab, and the state of the cathode electrode tab includes the width of the first film region on the side of the cathode electrode tab facing the first separator, the width of the second film region, and the defects of the cathode electrode tab.

[0021] In the technical solution, the third detection mechanism can be used to detect whether the width of the first film area and the second film area meets the set range, so that the cathode sheet has the first film area and the second film area with a suitable width, and through the detection of the third detection mechanism, the part of the cathode sheet with defects can be found and removed in time, thereby improving the quality of the cathode sheet for the electrode assembly.

[0022] In some embodiments, the winding device further comprises a fourth detection mechanism arranged on one side of the winding mechanism and used to detect the relative position of the anode sheet and the cathode sheet of the same turn of the electrode assembly on the winding mechanism.

[0023] In the technical solution, the fourth detection mechanism is used to detect the relative position of the anode sheet and the cathode sheet of the same turn of the electrode assembly after winding and forming, for example, to detect whether the anode sheet on one side or both sides in the width direction exceeds the edge of the cathode sheet, so that the anode sheet and the cathode sheet of the electrode assembly after winding and forming have better anti-lithium precipitation effect, the risk of OH (overhang, overhanging part) leakage is further reduced, and the quality of the electrode assembly is improved.

[0024] In some embodiments, the active material layer of the cathode sheet comprises a first film area and a second film area, the second film area is located on one side of the first film area close to the tab of the cathode sheet, the fourth detection mechanism is used to detect the distance between the edge of the second film area away from the first film area and the corresponding edge of the first separator, the distance between the edge of the first film area away from the second film area and the corresponding edge of the anode sheet, and the distance between the edge of the second film area away from the first film area and the corresponding edge of the first separator; and the second detection mechanism is used to detect the distance between the edge of the first film area close to the second film area and the corresponding edge of the anode sheet.

[0025] In the technical solution, through the cooperation of the fourth detection mechanism and the second detection mechanism, the OH of the anode sheet wrapped by the first separator, the OH of the anode sheet wrapped by the cathode sheet, and the OH of the cathode sheet wrapped by the first separator after compounding and edge sealing can be detected, and the risk of OH leakage is reduced.

[0026] In some embodiments, the second detection mechanism comprises a first detector arranged on the side of the cathode sheet away from the first separator, the first detector is used to detect at least the edge position of the first film area away from the second film area, the edge position of the first film area close to the second film area, and the edge position of the second film area away from the first film area; and a second detector arranged on the side of the second separator away from the anode sheet, the second detector is used to detect at least the position of the edge of the anode sheet corresponding to the second film area.

[0027] In the technical solution, the first detector and the second detector can detect whether the relative position of the composite and the edge-wound anode pole piece and the cathode pole piece is accurate, for example, whether the anode pole piece meets the requirement of exceeding the edge of the cathode pole piece by a certain distance in the width direction, thereby reducing the risk of OH leakage and killing and achieving a better effect of solving the lithium precipitation problem.

[0028] In some embodiments, the winding device further comprises a fifth detection mechanism arranged on one side of the winding mechanism and configured to detect the relative position of the anode pole piece and the cathode pole piece of the adjacent two turns of the electrode assembly on the winding mechanism.

[0029] In the technical solution, the fifth detection mechanism detects the relative position of the anode pole piece and the cathode pole piece of the adjacent two turns of the electrode assembly after winding and forming, so that the anode pole piece and the cathode pole piece of the electrode assembly after winding and forming have a better anti-lithium precipitation effect, the risk of OH leakage and killing is further reduced, and the quality of the electrode assembly is improved.

[0030] In some embodiments, the fifth detection mechanism is arranged towards the connection between the electrode assembly in front of the winding mechanism and the electrode assembly on the winding mechanism, wherein the fifth detection mechanism is configured to detect the position of the anode pole piece of the electrode assembly in front of the winding mechanism and the position of the cathode pole piece of the electrode assembly on the winding mechanism; or the fifth detection mechanism is configured to detect the position of the cathode pole piece of the electrode assembly in front of the winding mechanism and the position of the anode pole piece of the electrode assembly on the winding mechanism.

[0031] In the technical solution, the fifth detection mechanism can detect the relative position of the anode pole piece and the cathode pole piece of any adjacent two turns of the multiple turns of the electrode assembly during winding, realize comprehensive detection of the entire winding and forming electrode assembly, and achieve a better effect of reducing OH leakage and killing. Moreover, the stacking order of the anode pole piece and the cathode pole piece in the electrode assembly can be flexibly set, and the fifth detection mechanism has strong adaptability to electrode assemblies with different stacking orders.

[0032] In some embodiments, the winding device further comprises a cutting mechanism arranged between the edge-winding mechanism and the winding mechanism and configured to cut the electrode assembly; and a buffer mechanism arranged between the composite mechanism and the edge-winding mechanism and configured to buffer the composite sheet.

[0033] In the technical solution, the buffer mechanism can stably and continuously transmit the composite sheet to the edge-winding mechanism at a reduced composite speed of the composite mechanism, without reducing the edge-winding rate, so that the cutting mechanism can cut the strip-shaped electrode assembly without deceleration, thereby improving the winding efficiency and the overall production capacity.

[0034] In some embodiments, the first unwinding mechanism comprises an anode unwinding mechanism for unwinding the anode electrode sheet, and the winding device further comprises a sixth detection mechanism arranged between the anode unwinding mechanism and the compounding mechanism and configured to detect the state of the anode electrode sheet.

[0035] In the above technical solution, the sixth detection mechanism detects the state of the anode electrode sheet before compounding, which can at least reduce the waste of the cathode electrode sheet and the first separator, and facilitate the continuous unwinding of the second separator and the connection between multiple unwound electrode assemblies through the second separator.

[0036] In some embodiments, the winding device further comprises a detection mechanism comprising at least one of the first detection mechanism, the second detection mechanism, the third detection mechanism, the fourth detection mechanism, the fifth detection mechanism and the sixth detection mechanism; a calibration mechanism arranged on one side of the detection mechanism and configured to detect the position of the detection mechanism and issue a prompt message in the state that the position of the detection mechanism deviates, and the calibration mechanism is further configured to provide a reference line, and the detection mechanism detects the positions of the anode electrode sheet, the cathode electrode sheet, the first separator and the second separator according to the reference line.

[0037] In the above technical solution, the calibration mechanism can detect the position of the detection mechanism during use, reduce the risk of deviation of the detection mechanism, and reduce the risk of data distortion caused by the deviation of the detection mechanism. The calibration mechanism can provide a reference line that will not deviate due to the deviation of the detection mechanism or the deviation of the material, so that the detection mechanism can obtain more accurate material position through the reference line, improve the detection accuracy of the detection mechanism, and facilitate the calibration of the position of the detection mechanism through the reference line to determine whether the detection mechanism deviates, thereby improving the detection accuracy of the calibration mechanism.

[0038] The production method of the battery cell according to the embodiments of the present application comprises: laminating a cathode electrode sheet, a first separator and an anode electrode sheet and performing a compounding process to obtain a compounded sheet; continuously unwinding a second separator, laminating and arranging the second separator on the side of the anode electrode sheet away from the first separator, and connecting the first separator and the second separator by edge sealing to obtain an unwound electrode assembly; winding the unwound electrode assembly, and loading the wound electrode assembly into a shell and injecting an electrolyte to obtain a battery cell.

[0039] In the technical scheme, the cathode sheet, the first diaphragm and the anode sheet are not easy to deviate in the conveying process, the first diaphragm and the second diaphragm can wrap the anode sheet through the edge sealing mechanism, the second diaphragm can be unwound continuously through the second unwinding mechanism downstream of the composite mechanism, the second diaphragm can wrap the anode sheet better by extending beyond the anode sheet at the head and tail, the anode sheet is not easy to be exposed, the risk of the anode sheet being connected with the cathode sheet and the shell is reduced, and the plurality of electrode assemblies can be connected through the second diaphragm in the conveying process, so that the stability of conveying is improved.

[0040] In some embodiments, the state of the cathode sheet toward the first diaphragm is detected before the composite processing.

[0041] In the technical scheme, the defective part of the cathode sheet toward the first diaphragm can be found and removed in time through detection, so that the quality of the cathode sheet for the electrode assembly is improved.

[0042] In some embodiments, the state of the anode sheet is detected before the composite processing.

[0043] In the technical scheme, the defective part of the anode sheet can be found and removed in time through detection, so that the quality of the anode sheet for the electrode assembly is improved.

[0044] In some embodiments, the state of the composite sheet is detected after the composite processing and before the edge sealing processing.

[0045] In the technical scheme, the defective part of the composite sheet can be found and removed in time through detection, so that the quality of the cathode sheet, the first diaphragm and the anode sheet for the electrode assembly is improved.

[0046] In some embodiments, the edge sealing state, the state of the cathode sheet away from the first diaphragm, the relative position of the anode sheet and the cathode sheet, and the relative position of the first diaphragm and the cathode sheet are detected after the edge sealing processing.

[0047] In the technical scheme, the defective part of the electrode assembly that is not wound can be found and removed in time through detection, the risk of OH missing killing is reduced, and the quality of the electrode assembly is improved.

[0048] In some embodiments, the relative position of the anode sheet and the cathode sheet of two adjacent turns of the electrode assembly is detected in the winding process, and the relative position of the anode sheet and the cathode sheet of the same turn of the electrode assembly is detected.

[0049] In the technical scheme, the relative positions of the anode pole piece and the cathode pole piece of the same circle and the adjacent two circles in the electrode assembly during the winding process are detected, so that the lithium precipitation resistance of the anode pole piece and the cathode pole piece of the electrode assembly after winding is better, the risk of OH leakage is further reduced, and the quality of the electrode assembly is improved. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 is a schematic diagram of a battery;

[0051] Figure 2 is a schematic diagram of a battery cell;

[0052] Figure 3 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0053] Figure 4 is a schematic diagram of a first detection mechanism in the present application; Figure 3

[0054] Figure 5 is a schematic diagram of a second detection mechanism in the first embodiment of the present application;

[0055] Figure 6 is a schematic diagram of a third detection mechanism in the present application; Figure 3

[0056] is a schematic diagram of a local structure at the fourth detection mechanism in the present application; Figure 7 Figure 3 is a schematic diagram of a fourth detection mechanism in the present application;

[0057] Figure 8 Figure 3 is a schematic diagram of a fifth detection mechanism in the second embodiment of the present application;

[0058] Figure 9 is a schematic diagram of a local structure at the fifth detection mechanism in the present application;

[0059] Figure 10 is a schematic diagram of a local structure at the sixth detection mechanism in the present application; Figure 3

[0060] is a schematic diagram of a sixth detection mechanism in the present application. Figure 11 Figure 3 REFERENCE SIGNS:

[0061] Battery 300; battery cell 310; shell 320; Figure 12 Figure 3

[0062] Battery 300; battery cell 310; shell 320;

[0063] Battery 300; battery cell 310; shell 320;

[0064] ​​​​​Electrode assembly 200; anode tab 210; cathode tab 220; first film area 221; second film area 222; first separator 231; second separator 232; composite tab 240; junction 250; lug 260;

[0065] Winding device 100;

[0066] First unwinding mechanism 10; cathode unwinding mechanism 11; anode unwinding mechanism 12; first separator unwinding mechanism 13;

[0067] Second unwinding mechanism 20; composite mechanism 30; edge sealing mechanism 40;

[0068] First detection mechanism 51; second detection mechanism 52; first detector 521; second detector 522; third detection mechanism 53; fourth detection mechanism 54; fifth detection mechanism 55; sixth detection mechanism 56;

[0069] Winding mechanism 60; winding needle 61; cutting mechanism 70; buffer mechanism 80; deviation rectifying mechanism 90;

[0070] Thickness direction F1; width direction F2; length direction F3. DETAILED DESCRIPTION

[0071] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0072] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms “first”, “second” and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0073] In the present application, “embodiment” means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0074] In the description of the present application, it should be noted that unless specifically defined and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] The term "and / or" in the present application only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0076] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0077] "Multiple" appearing in the present application means two or more (including two).

[0078] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, 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 battery, the market demand is also increasing.

[0079] The battery monomer includes an electrode assembly, and the electrode assembly includes a cathode sheet, an anode sheet and a separator. In the related art, the cathode sheet, the anode sheet and the separator are adhered to each other and wound on a winding mechanism during the production of the electrode assembly, and the offset between the layers is obtained by a detector at the winding mechanism. The separator is easy to fold during production, which causes the cathode sheet and the anode sheet to be short-circuited, resulting in safety hazards; or causes the anode sheet in the battery monomer to be short-circuited with the shell, resulting in corrosion and leakage.

[0080] Based on this, the application provides a winding device, comprising a first unwinding mechanism, a second unwinding mechanism, a compounding mechanism and an edge sealing mechanism. The compounding mechanism compounds the cathode pole piece, the first diaphragm and the anode pole piece to form a compound piece, wherein the first diaphragm is located between the anode pole piece and the cathode pole piece, and the edge sealing mechanism is used for sealing and connecting the second diaphragm with the edge of the first diaphragm of the compound piece, so that the first diaphragm and the second diaphragm wrap the anode pole piece and are connected with each other to obtain an unwound electrode assembly.

[0081] In the above embodiment, even if the diaphragm (the first diaphragm and the second diaphragm) is folded during production, the edge sealing connection still wraps the anode pole piece with the diaphragm after folding without exposure, so that the anode pole piece is not easy to be lapped with the cathode pole piece or the shell of the battery monomer, thereby reducing the risk of short circuit and corrosion. In addition, by compounding the cathode pole piece, the first diaphragm and the anode pole piece through the compounding mechanism, the cathode pole piece, the first diaphragm and the anode pole piece are connected together, which can reduce the deviation of the cathode pole piece relative to the first diaphragm and the deviation of the anode pole piece relative to the first diaphragm during winding and use, facilitate the subsequent edge sealing connection of the first diaphragm and the second diaphragm, and be conducive to improving the accuracy of the relative positions between the cathode pole piece, the first diaphragm, the anode pole piece and the second diaphragm.

[0082] The winding device of the embodiment of the application is used for producing an electrode assembly, the electrode assembly can be used for a battery monomer, and the battery monomer can be used for a battery. The electrical equipment can include any one of the following embodiments of the battery monomer or the battery. Specifically, the electrical equipment can use the battery or the battery monomer as a power supply, and the electrical equipment can be but is not limited to a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric aircraft toy and the like, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0083] The following embodiments are described by taking a vehicle as an example for the sake of convenience.

[0084] Reference Figures 1-2 The inside of the vehicle is provided with a battery 300, and the battery 300 can be arranged at the bottom, the head or the tail of the vehicle. The battery 300 can be used for power supply of the vehicle, for example, the battery 300 can be used as an operating power supply of the vehicle. The vehicle can further include a controller and a motor, and the controller is used to control the battery 300 to supply power to the motor, for example, to meet the working power demand of the vehicle during starting, navigation and driving.

[0085] In the embodiment of the application, the battery 300 can not only be used as an operating power supply of the vehicle, but also be used as a driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0086] In embodiments of the present application, as shown in Figure 1 The battery 300 refers to a single physical module including one or more battery cells 310 to provide higher voltage and capacity. For example, the battery 300 mentioned in the present application can include a battery module or a battery pack, etc. Some batteries 300 can include a box for packaging one or more battery cells 310 or multiple battery modules. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell 310. Of course, there are also some batteries 300 that can not include the above-mentioned box and are directly arranged in the battery installation cabin of the electric device.

[0087] In the present application, the battery cell 310 can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc. Embodiments of the present application are not limited thereto. The battery cell 310 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. Embodiments of the present application are not limited thereto. The battery cell 310 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft package battery cells, etc. Embodiments of the present application are not limited thereto.

[0088] For example, as shown in Figure 2 The battery cell 310 can include a shell 320 for accommodating the electrode assembly 200 and the electrolyte, and the shell 320 of the battery cell 310 can contain one or more electrode assemblies 200. The electrode assembly 200 is a component where an electrochemical reaction occurs in the battery cell 310, and the electrode assembly 200 includes a plurality of layers of materials arranged in layers, specifically including a cathode tab 220, an anode tab 210, and a separator (a first separator 231 and a second separator 232). The battery cell 310 mainly works by relying on the movement of metal ions between the cathode tab 220 and the anode tab 210.

[0089] The cathode tab 220 includes a cathode current collector and a cathode active material layer, and the cathode active material layer is coated on the surface of the cathode current collector. The cathode current collector without the cathode active material layer protrudes from the cathode current collector with the cathode active material layer, and the cathode current collector without the cathode active material layer serves as the tab 260 of the cathode tab 220. Taking a lithium ion battery as an example, the material of the cathode current collector can be aluminum, and the cathode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc.

[0090] The anode tab 210 includes an anode current collector and an anode active material layer coated on the surface of the anode current collector. The anode current collector without the anode active material layer protrudes from the anode current collector with the anode active material layer, and the anode current collector without the anode active material layer serves as the tab 260 of the anode tab 210. The material of the anode current collector can be copper, and the anode active material can be carbon or silicon, etc. To ensure that no fuse occurs when passing a large current, the number of the tabs 260 of the cathode tab 220 is multiple and stacked together, and the number of the tabs 260 of the anode tab 210 is multiple and stacked together. In the description of the present application, the width, relative position, etc. of the tab (the anode tab 210 and the cathode tab 220) are described with respect to the active material layer of the tab, and the tab 260 is not included.

[0091] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. The cathode tab 220 and the anode tab 210 are stacked along the thickness direction F1, the separator separates the cathode tab 220 and the anode tab 210, and is stacked along the thickness direction F1 of the tab with the cathode tab 220 and the anode tab 210. The first separator 231, the second separator 232, the cathode tab 220 and the anode tab 210 are wound to form an integrated electrode assembly 200.

[0092] In addition, the electrode assembly 200 has two states in the production process, i.e. a wound state and an unwound state. Before winding, the anode tab 210, the cathode tab 220, the first separator 231 and the second separator 232 constitute an unwound electrode assembly 200, and the unwound electrode assembly 200 can be wound to obtain a wound electrode assembly 200, which can be used for the battery cell 310.

[0093] Next, with reference to the accompanying drawings, a winding device 100 for producing an electrode assembly 200 according to an embodiment of the present application is described.

[0094] As described above with reference to the accompanying drawings, the winding device 100 provided by some embodiments of the present application includes a first unwinding mechanism 10, a second unwinding mechanism 20, a composite mechanism 30, an edge sealing mechanism 40 and a winding mechanism 60. Figure 3 Figure 3 The winding device 100 provided by some embodiments of the present application is shown in the accompanying drawings. The winding device 100 includes a first unwinding mechanism 10, a second unwinding mechanism 20, a composite mechanism 30, an edge sealing mechanism 40 and a winding mechanism 60.

[0095] ​The first unwinding mechanism 10 is used to unwind the cathode tab 220, the first separator 231 and the anode tab 210. The second unwinding mechanism 20 is used to unwind the second separator 232. The compounding mechanism 30 is arranged downstream of the first unwinding mechanism 10 and is used to compound the cathode tab 220, the first separator 231 and the anode tab 210 to form a compound tab 240, wherein the first separator 231 is located between the anode tab 210 and the cathode tab 220. The edge sealing mechanism 40 is arranged downstream of the compounding mechanism 30 and the second unwinding mechanism 20 and is used to seal the edge of the second separator 232 with the first separator 231 of the compound tab 240 to obtain an unwound electrode assembly 200. The winding mechanism 60 is arranged downstream of the edge sealing mechanism 40 and is used to wind the unwound electrode assembly 200.

[0096] For the electrode assembly 200, the material conveying direction of the anode tab 210, the cathode tab 220, the first separator 231 and the second separator 232 refers to the running direction of each material in the production process, i.e. the length direction F3 of each material of the electrode assembly 200; the thickness direction F1 of the anode tab 210, the cathode tab 220, the first separator 231 and the second separator 232 refers to the direction with the smallest size of the material, i.e. the stacking direction of each material in the electrode assembly 200; the width direction F2 of the anode tab 210, the cathode tab 220, the first separator 231 and the second separator 232 refers to the direction perpendicular to the thickness direction F1 and the material conveying direction. During the winding process of the electrode assembly 200, the winding axis is generally parallel to the width direction F2.

[0097] The unwinding mechanism (such as the first unwinding mechanism 10 and the second unwinding mechanism 20) is a device used to release the material in a wound state in a strip shape. The unwinding mechanism can include an unwinding shaft capable of carrying the material in a wound state and capable of releasing the material in a strip shape. The unwinding shaft can include a shaft, a drum, a roller or other suitable components for winding the strip material, and the specific design and features of the unwinding shaft can be set according to the width and thickness of the strip material. The material can be wound in advance and placed directly on the unwinding shaft, or wound in real time by the unwinding shaft. The unwinding shaft can be wound and released by rotating, and the rotation of the unwinding shaft can be driven by a motor, a hydraulic system or a pneumatic system, etc.

[0098] The first unwinding mechanism 10 is used for unwinding the cathode electrode sheet 220, the first diaphragm 231 and the anode electrode sheet 210. The first unwinding mechanism 10 can include multiple unwinding mechanisms to carry and release the cathode electrode sheet 220, the first diaphragm 231 and the anode electrode sheet 210. The unwinding mechanism for carrying and releasing the cathode electrode sheet 220 can be one or more, the unwinding mechanism for carrying and releasing the first diaphragm 231 can be one or more, and the unwinding mechanism for carrying and releasing the anode electrode sheet 210 can be one or more. The multiple unwinding mechanisms can be alternately used to realize more efficient unwinding operation and improve production efficiency.

[0099] The second unwinding mechanism 20 is used for unwinding the second diaphragm 232. The second unwinding mechanism 20 can include one or more unwinding mechanisms to carry and release the second diaphragm 232. The multiple unwinding mechanisms can be alternately used to realize more efficient unwinding operation and improve production efficiency.

[0100] The composite mechanism 30 is arranged downstream of the first unwinding mechanism 10, so that the cathode electrode sheet 220, the first diaphragm 231 and the anode electrode sheet 210 unwound by the first unwinding mechanism 10 can be transmitted to the composite mechanism 30 for compounding to form a composite sheet 240.

[0101] The composite mechanism 30 can compound the cathode electrode sheet 220 with the first diaphragm 231 away from one side of the anode electrode sheet 210, and compound the anode electrode sheet 210 with the first diaphragm 231 away from one side of the cathode electrode sheet 220, with the first diaphragm 231 located between the anode electrode sheet 210 and the cathode electrode sheet 220. That is, the cathode electrode sheet 220, the first diaphragm 231 and the anode electrode sheet 210 are connected together, for example, by heating, pressurizing or the like. The first diaphragm 231 with a higher PVDF (polyvinylidene fluoride) content (for example, a content of 1 mg, 1.5 mg, 2 mg) can be used to improve the adhesion of the first diaphragm 231, for example, the content of PVDF in the first diaphragm 231 is higher than that in the second diaphragm 232, to improve the connection tightness of the first diaphragm 231 with the cathode electrode sheet 220 and the anode electrode sheet 210, respectively, to reduce the deviation of the cathode electrode sheet 220 relative to the first diaphragm 231 and the deviation of the anode electrode sheet 210 relative to the first diaphragm 231 during transmission, winding and use, which is conducive to improving the accuracy of the relative positions of the materials.

[0102] The composite sheet 240 refers to a sheet body obtained by compounding the cathode electrode sheet 220, the first diaphragm 231 and the anode electrode sheet 210 through the composite mechanism 30. The relative positions of the cathode electrode sheet 220, the first diaphragm 231 and the anode electrode sheet 210 are fixed, and the cathode electrode sheet 220, the first diaphragm 231 and the anode electrode sheet 210 can be transmitted synchronously without easy deviation, which is conducive to improving the position accuracy of the cathode electrode sheet 220 and the anode electrode sheet 210 in the production process.

[0103] In some embodiments, the compounding mechanism 30 can include two compounding rollers arranged oppositely, which can heat and apply a predetermined pressure along the thickness direction F1 to the cathode tab 220, the first separator 231 and the anode tab 210, so as to bond the cathode tab 220, the first separator 231 and the anode tab 210 together, and achieve the compounding connection of the cathode tab 220, the first separator 231 and the anode tab 210.

[0104] The edge sealing mechanism 40 is arranged downstream of the compounding mechanism 30 and the second unwinding mechanism 20, so that the compounded sheet 240 formed by the compounding mechanism 30 and the second separator 232 unwound by the second unwinding mechanism 20 can be conveyed to the edge sealing mechanism 40 for edge sealing, so as to obtain the unrolled electrode assembly 200. That is, the second separator 232 and the first separator 231 in the compounded sheet 240 are connected together, for example, by heating, pressing, pasting or the like.

[0105] The first separator 231 and the second separator 232 are respectively located on both sides of the anode tab 210 in the thickness direction F1, and the edges of the first separator 231 and the second separator 232 can refer to the part of the separator exceeding the edge of the anode tab 210 in the width direction F2, or the part of the separator exceeding the edge of the anode tab 210 in the width direction F2 and the length direction F3. In other words, the width of the separator is greater than the width of the anode tab 210, and the length of the separator is greater than the length of the anode tab 210. And in the production process, the anode tab 210 is located between the two side edges of the separator in the width direction F2, and the anode tab 210 is located between the two side edges of the separator in the length direction F3.

[0106] The edge sealing mechanism 40 seals the part of the separator exceeding the edge of the anode tab 210 in the width direction F2 and the length direction F3, that is, seals the four side edges of the separator, so that the wrapping of the separator on the anode tab 210 is more secure, and the effect of preventing the anode tab 210 from overlapping with the cathode tab 220 and the anode tab 210 from overlapping with the shell 320 is better, which is conducive to reducing the risk of short circuit caused by the overlap of the anode tab 210 and the cathode tab 220, and reducing the risk of corrosion and liquid leakage caused by the overlap of the anode tab 210 and the shell 320 of the battery monomer 310.

[0107] In some embodiments, the edge sealing mechanism 40 includes four edge sealing rollers arranged oppositely in pairs, which can heat and apply a predetermined pressure along the thickness direction F1 to the four side edges of the separator, so as to achieve the edge sealing connection of the two layers of separators.

[0108] When the edge sealing is performed, the part where the two layers of the diaphragm are connected is the edge sealing. According to actual needs, the edge sealing on both sides of the width direction F2 of the two layers of the diaphragm can continuously extend along the material conveying direction, or can discontinuously extend, which is within the protection scope of the present application.

[0109] In some related technologies, the pole piece and the diaphragm are tightly attached by the attaching roller before winding, and there is no connection between the materials and the diaphragm, but only a contact relationship, which is easy to separate from each other after the external force is removed, and there is a risk of overlap between the anode pole piece and the cathode pole piece. In the present application, the cathode pole piece 220, the first diaphragm 231 and the anode pole piece 210 are compounded to form a tightly connected composite sheet 240 by the compounding mechanism 30, and the edges of the first diaphragm 231 and the second diaphragm 232 are connected together to realize edge sealing by the edge sealing mechanism 40. Even if the external force is removed, the cathode pole piece 220, the first diaphragm 231 and the anode pole piece 210 are not easy to separate, and the first diaphragm 231 and the second diaphragm 232 will not separate to expose the anode pole piece 210. The diaphragm is not easy to fold during the winding process of the electrode assembly 200, and is not easy to be disturbed by the cavity during the liquid injection process. The risk of overlap between the anode pole piece 210 and the cathode pole piece 220 and the risk of overlap between the anode pole piece 210 and the shell 320 of the battery monomer 310 are effectively reduced, and the problem of lithium extraction is improved.

[0110] The second unwinding mechanism 20 is used to unwind the second diaphragm 232, and the second unwinding mechanism 20 is arranged downstream of the compounding mechanism 30, so that the unwinding of the second diaphragm 232 is not affected by the cutting, defect removal and other processes of the upstream composite sheet 240. According to needs, continuous unwinding (i.e. uninterrupted unwinding) of the second diaphragm 232 can be realized, so that the second diaphragm 232 at the head and tail of the pole piece of each electrode assembly 200 (for example, on both sides of the pole piece in the length direction F3) can exceed, thereby improving the effect of separating the cathode pole piece 220 and the anode pole piece 210 by the second diaphragm 232 during the winding of the electrode assembly 200, and being conducive to reducing the risk of short circuit caused by the overlap between the anode pole piece 210 and the cathode pole piece 220. In addition, the second diaphragm 232 of a plurality of electrode assemblies 200 can be connected during conveying, thereby improving the stability of conveying and reducing the deviation of the electrode assembly 200 during production.

[0111] In addition, the continuous unwinding of the second diaphragm 232 can save the continuous unwinding of the first diaphragm 231, and only the unwinding of the second diaphragm 232 can exceed the head and tail of the pole piece and connect a plurality of electrode assemblies 200, which is conducive to saving materials and is more economical.

[0112] The winding mechanism 60 is a device for winding the composite and edge-sealed strip-shaped unwound electrode assembly 200. The wound electrode assembly 200 can be placed in the housing 320 of the battery monomer 310 for use. The winding mechanism 60 can include a winding needle 61, which can wind the strip-shaped electrode assembly 200 by rotating. The rotation of the winding needle 61 can be driven by a motor, a hydraulic system or a pneumatic system, etc. The rotation of the winding needle 61 can make the strip-shaped electrode assembly 200 wind around the winding needle 61 to form a specific shaped electrode assembly 200. The shape of the winding needle 61 can be a regular shape such as a cylindrical shape, a conical shape, etc., or an irregular shape. According to different shapes of the winding needle 61, the wound electrode assembly 200 can present different shapes.

[0113] Thus, according to the winding device 100 of the embodiment of the present application, the cathode tab 220, the first diaphragm 231 and the anode tab 210 can not be easily deviated during the conveying process by the composite mechanism 30, the first diaphragm 231 and the second diaphragm can wrap the anode tab 210 by the edge sealing mechanism 40, and the unwinding of the second diaphragm 232 can not be affected by the upstream material cutting, defect removal and other processes by the second unwinding mechanism 20, which is conducive to realizing the continuous unwinding of the second diaphragm 232, making the second diaphragm 232 exceed the tabs at the head and tail to better wrap the anode tab 210, making the anode tab 210 not easily exposed to reduce the risk of the anode tab 210 being respectively overlapped with the cathode tab 220 and the housing 320 of the battery monomer 310, and making the plurality of electrode assemblies 200 can be connected by the second diaphragm 232 during the conveying process, improving the stability of the conveying, and making the consistency of the plurality of electrode assemblies 200 after winding and forming better.

[0114] In some embodiments of the present application, as shown in Figures 3-4 , Figure 4 to Figure 3 the detection schematic diagram of the first detection mechanism 51. The winding device 100 further comprises a first detection mechanism 51, which is arranged downstream of the composite mechanism 30 and is at least used for detecting the composite state.

[0115] The detection mechanism (such as the first detection mechanism 51) can adopt photoelectric sensors, X-ray cameras, CCD (charge coupled device) vision sensors, etc., and the types of different detection mechanisms can be the same or different.

[0116] For example, the detection mechanism can include a CCD. The CCD can acquire an optical image of the material to achieve detection. Further, the CCD can also convert the optical image into a digital signal for analysis, processing and storage of the optical image. For example, the detection mechanism can include an X-ray camera. Specifically, the X-ray camera can penetrate the separator to detect the position of the anode tab 210 located in the inner layer. The X-ray camera has high resolution and can penetrate the object to detect, thereby improving the detection accuracy.

[0117] In addition, the detection mechanism can be provided on one side or both sides of the material thickness direction F1 according to actual needs, for example, detection mechanisms are provided on both sides of the cathode tab 220 in the thickness direction F1 to detect the parameters and the like of the active material layer on both sides of the cathode tab 220; for example, detection mechanisms are provided on both sides of the electrode assembly 200 in the thickness direction F1 to detect the relative positions of the anode tab 210 and the cathode tab 220; for example, a detection mechanism is provided on one side of the cathode tab 220 in the thickness direction F1 to detect the self-defects of the cathode tab 220. The detection mechanism can detect multiple parts of the material in the length direction F3 in sequence during the movement of the material, or can continuously detect the material in the length direction F3.

[0118] The first detection mechanism 51 is provided downstream of the compounding mechanism 30, so that the cathode tab 220, the first separator 231 and the anode tab 210 can be conveyed to the first detection mechanism 51 after being compounded to form the compound tab 240, so as to detect the compounding state by using the first detection mechanism 51. For example, the detection mechanism can detect the compounding defects such as the tab and separator corner, damage, bruising, and wrinkling.

[0119] In some related technologies, the tab detection of the detector is not accurate, and defects such as OH (overhang, overhang) missed killing, tab corner bruising and the like are easily missed. However, the first detection mechanism 51 can detect the compounding state to achieve more comprehensive detection, avoid the defects being shielded after the cathode tab 220, the first separator 231, the anode tab 210 and the second separator 232 are laminated to form the electrode assembly 200, and improve the detection accuracy, thereby reducing the risk of missing defects in the production process of the electrode assembly 200.

[0120] In some embodiments, as Figures 3-4As shown, the composite state includes the state of the anode tab 210 and the first separator 231. The state of the anode tab 210 includes but is not limited to the width of the active material layer of the anode tab 210, known tab defects (such as a tab with a yellow label), tab breakage, etc. The state of the first separator 231 includes but is not limited to the separator corner, breakage, etc. The state of the anode tab 210 and the first separator 231 includes but is not limited to the OH of the first separator 231 wrapping the anode tab 210, i.e. the size of the first separator 231 edge beyond the anode tab 210 edge in at least one of the width direction F2 and the length direction F3, and the presence of a defect means that the size of the overhanging portion does not meet the required size range.

[0121] Thus, the first detection mechanism 51 can be used to detect whether the width of the active material layer of the anode tab 210 meets the set range after compounding and before edge sealing, and whether the anode tab 210 and the first separator 231 have defects such as compounding defects such as crushing, etc. so as to be discovered and rejected in time; the first detection mechanism 51 can also detect whether the relative position of the anode tab 210 and the first separator 231 is accurate, for example, the two sides of the first separator 231 in the width direction F2 and the length direction F3 can overhang the edge of the anode tab 210 by a sufficient size, facilitating subsequent edge sealing processing and reducing the risk of lapping of the anode tab 210 and the cathode tab 220.

[0122] In some embodiments of the present application, as shown in Figure 3 and Figure 5 as shown, Figure 5 is Figure 3 a detection schematic diagram of the second detection mechanism 52. The winding device 100 further comprises a second detection mechanism 52, which is arranged downstream of the edge sealing mechanism 40 and is at least used to detect the edge sealing state.

[0123] The second detection mechanism 52 is arranged downstream of the edge sealing mechanism 40, so that the composite sheet 240 and the second separator 232 can be conveyed to the second detection mechanism 52 after edge sealing, so as to detect the state of the formed edge seal by the second detection mechanism 52. For example, detecting edge sealing defects such as tab corner, head and tail part wrinkling, separator mispositioning, etc. For example, the relative position of the edge seal formed by the first separator 231 and the second separator 232 and the anode tab 210 can be detected, so as to adjust the separator and the edge sealing mechanism 40 according to the detection result, so that the width and position of the formed edge seal meet the requirements of the separator wrapping the anode tab 210, improve the reliability of the edge seal, and enable the separator to reliably limit and protect the anode tab 210.

[0124] The second detection mechanism 52 is used for detecting the sealing edge state after the cathode tab 220, the first separator 231, the anode tab 210 and the second separator 232 are laminated and the separators are sealed, so that more comprehensive detection can be achieved, the reliability of the sealing edge connection is improved, and the risk of missing defects in the production process of the electrode assembly 200 is reduced.

[0125] In some embodiments, as shown in Figure 3 and Figure 5 the second detection mechanism 52 is also used for detecting the relative positions of the cathode tab 220 and the anode tab 210, the relative positions of the first separator 231 and the cathode tab 220, and the relative positions of the second separator 232 and the anode tab 210.

[0126] The second detection mechanism 52 is also used for detecting the relative positions of the cathode tab 220 and the anode tab 210, so that the relative positions of the anode tab 210 and the cathode tab 220 of the obtained electrode assembly 200 are accurate after the cathode tab 220, the first separator 231, the anode tab 210 and the second separator 232 are laminated and sealed, for example, the requirement that the edges of the anode tab 210 on both sides of the width direction F2 exceed the edges of the cathode tab 220 by a certain distance is met, the risk of OH missing is reduced, and the effect of solving the problem of lithium precipitation is better.

[0127] The second detection mechanism 52 is also used for detecting the relative positions of the first separator 231 and the cathode tab 220, and the relative positions of the second separator 232 and the anode tab 210. The relative positions of the first separator 231 and the cathode tab 220 can be understood as the OH of the first separator 231 wrapping the cathode tab 220. The relative positions of the second separator 232 and the anode tab 210 can be understood as the OH of the second separator 232 wrapping the anode tab 210. The “OH of the first separator 231 wrapping the cathode tab 220” means that the edges of the first separator 231 exceed the edges of the cathode tab 220 in the width direction F2 and the length direction F3. The size of the exceeding part does not meet the required size range, and the “OH of the second separator 232 wrapping the anode tab 210” is the same.

[0128] Therefore, the second detection mechanism 52 can detect whether the relative positions of the cathode tab 220 and the first separator 231 and the relative positions of the anode tab 210 and the second separator 232 are accurate after the separators are sealed, so as to improve the position accuracy of the cathode tab 220, the first separator 231, the anode tab 210 and the second separator 232. The second detection mechanism 52 can also detect whether the edges of the separators on both sides of the width direction F2 and the length direction F3 can exceed the edges of the tabs by a sufficient size, so as to provide sufficient space for sealing and improve the effect of separating the anode tab 210 and the cathode tab 220 by the separators.

[0129] According to some embodiments of the present application, as shown in Figure 3As shown, the first unwinding mechanism 10 includes a cathode unwinding mechanism 11 for unwinding the cathode electrode 220. The winding equipment 100 also includes a third detection mechanism 53, which is located between the cathode unwinding mechanism 11 and the composite mechanism 30, and is used to detect the state of the cathode electrode 220.

[0130] The cathode unwinding mechanism 11 can carry and release the cathode electrode 220. The third detection mechanism 53 is located between the cathode unwinding mechanism 11 and the composite mechanism 30, that is, the third detection mechanism 53 is located downstream of the cathode unwinding mechanism 11 and upstream of the composite mechanism 30. It can detect a single cathode electrode 220 that has not been covered by composite or other operations, and the detection of the state of the cathode electrode 220 is more accurate.

[0131] The condition of the cathode electrode 220 includes, but is not limited to, the width of the active material layer on at least one side of the surface in the thickness direction F1 of the cathode electrode 220, known defective electrodes (such as those with yellow labels), and electrode damage. By inspecting the condition of the cathode electrode 220 before the composite mechanism 30 is composited by the third inspection mechanism 53, defective parts of the cathode electrode 220 can be detected and removed in a timely manner, thereby improving the quality of the cathode electrode 220 used in the electrode assembly 200.

[0132] The third detection mechanism 53 may include one or more detectors. For example, in some embodiments, the third detection mechanism 53 includes two detectors, which are respectively disposed on both sides of the cathode electrode 220 in the thickness direction F1. The two detectors can detect the electrode state on both sides of the cathode electrode 220 in the thickness direction F1, and the detection accuracy of the cathode electrode 220 state is higher.

[0133] In some embodiments, such as Figure 3 and Figure 6 As shown, Figure 6 for Figure 3 A schematic diagram of the third testing mechanism 53. The third testing mechanism 53 is located on the side of the cathode electrode 220 facing the first diaphragm 231 and is used to detect the state of the cathode electrode 220 facing the first diaphragm 231. The second testing mechanism 52 is used to detect the state of the cathode electrode 220 facing away from the first diaphragm 231.

[0134] The cathode tab 220 is compounded with the first separator 231 and the anode tab 210 through the compounding mechanism 30. The side of the cathode tab 220 facing the first separator 231 is shielded by the first separator 231 and the anode tab 210 and is difficult to be detected. The third detection mechanism 53 arranged between the cathode unwinding mechanism 11 and the compounding mechanism 30 can detect the state of the cathode tab 220 on the side facing the first separator 231 before the cathode tab 220 is compounded. The state of the cathode tab 220 on the side facing the first separator 231 after compounding is shielded and cannot be accurately detected. The second detection mechanism 52 arranged downstream of the compounding mechanism 30 detects the state of the cathode tab 220 on the side away from the first separator 231 to detect the states of the cathode tab 220 on both sides in the thickness direction F1, thereby improving the detection accuracy and reducing the risk of defect missed killing in the production process of the electrode assembly 200.

[0135] The third detection mechanism 53 can detect the state of the surface of the cathode tab 220 on one side in the thickness direction F1, and the second detection mechanism 52 can detect the state of the surface of the cathode tab 220 on the other side in the thickness direction F1, which facilitates the detection of the states of the cathode tab 220 on both sides in the thickness direction F1 while saving one detector at the third detection mechanism 53, thereby being more economical.

[0136] In some embodiments, as shown in FIG. 2, the active material layer of the cathode tab 220 includes a first film region 221 and a second film region 222. The second film region 222 is located on the side of the first film region 221 close to the tab 260 of the cathode tab 220. Figure 6 The state of the cathode tab 220 includes the width of the first film region 221 on the side of the cathode tab 220 facing the first separator 231, the width of the second film region 222, and the defect of the cathode tab 220.

[0137] The second film region 222 can be made of AT11 material, and the first film region 221 can be made of lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate. The second film region 222 is arranged to prevent burrs from being formed during the cutting of the tab 260. In the description of the present application, the OH of the anode tab 210 wrapping the cathode tab 220 refers to the active material layer of the anode tab 210 and the first film region 221 of the cathode tab, and does not include the second film region 222 of the cathode tab 220.

[0138] The state of the cathode tab 220 includes, but is not limited to, the width of the first film area 221 on the side of the cathode tab 220 facing the first separator 231, the width of the second film area 222, known tab defects (such as a tab with a yellow label), tab breakage, etc. The third detection mechanism 53 can be used to detect whether the widths of the first film area 221 and the second film area 222 meet the set range, so that the cathode tab 220 has a first film area 221 and a second film area 222 with appropriate widths, and through the detection of the third detection mechanism 53, the defective part of the cathode tab 220 can be found and removed in time, thereby improving the quality of the cathode tab 220 used for the electrode assembly 200.

[0139] According to some embodiments of the present application, as shown in Figure 3 and Figures 7-8 , Figure 7 is Figure 3 a local structure schematic view at the fourth detection mechanism 54 in Figure 8 is Figure 3 a detection schematic view of the fourth detection mechanism 54 in The winding device 100 further comprises a fourth detection mechanism 54. The fourth detection mechanism 54 is arranged on one side of the winding mechanism 60 and is used to detect the relative positions of the anode tab 210 and the cathode tab 220 of the same coil of the electrode assembly 200 on the winding mechanism 60.

[0140] By detecting the relative positions of the anode tab 210 and the cathode tab 220 of the same coil of the electrode assembly 200 after winding and forming through the fourth detection mechanism 54, for example, detecting that the anode tab 210 on one side or both sides of the width direction F2 exceeds the edge of the cathode tab 220, the lithium precipitation resistance of the anode tab 210 and the cathode tab 220 of the electrode assembly 200 after winding and forming is better, further reducing the risk of OH leakage, and improving the quality of the electrode assembly 200. And through the fourth detection mechanism 54, the relative positions of the anode tab 210 and the cathode tab 220 of the same coil of the electrode assembly 200 can be accurately detected when the electrode assembly 200 on the winding mechanism 60 is tensioned, for example, when the separator in the electrode assembly 200 is tensioned, the fourth detection mechanism 54 is easier to detect the tab position through the separator, and the detection accuracy is higher.

[0141] In some embodiments, as shown in Figure 3 and Figures 5-8As shown, the active material layer of the cathode tab 220 includes a first film region 221 and a second film region 222, and the second film region 222 is located on the side of the first film region 221 close to the tab 260 of the cathode tab 220. The fourth detection mechanism 54 is configured to detect the distance between the side edge of the anode tab 210 away from the second film region 222 and the corresponding side edge of the first separator 231, the distance between the side edge of the first film region 221 away from the second film region 222 and the corresponding side edge of the anode tab 210, and the distance between the side edge of the second film region 222 away from the first film region 221 and the corresponding side edge of the first separator 231. The second detection mechanism 52 is configured to detect the distance between the side edge of the first film region 221 close to the second film region 222 and the corresponding side edge of the anode tab 210.

[0142] When the unwound electrode assembly 200 is wound by the winding mechanism 60, the second film region 222 of the cathode tab 220 can or can not exceed the edge of the anode tab 210 in the width direction F2. In the case where the second film region 222 of the cathode tab 220 does not exceed the edge of the anode tab 210, the OH of the anode tab 210 wrapped by the cathode tab 220 on both sides can be detected by the fourth detection mechanism 54. In the case where the second film region 222 of the cathode tab 220 exceeds the edge of the anode tab 210, the side edge of the anode tab 210 close to the second film region 222 is shielded by the cathode tab 220, and only the OH of the anode tab 210 wrapped by the cathode tab 220 on one side can be detected by the fourth detection mechanism 54. However, in combination with the second detection mechanism 52, the OH of the anode tab 210 wrapped by the cathode tab 220 on the other side can be detected by the second detection mechanism 52, so as to obtain the OH of the anode tab 210 wrapped by the cathode tab 220 on both sides. Thus, the fourth detection mechanism 54 and the second detection mechanism 52 can detect the OH of the anode tab 210 wrapped by the first separator 231, the OH of the anode tab 210 wrapped by the cathode tab 220, and the OH of the cathode tab 220 wrapped by the first separator 231 after the compounding and edge sealing.

[0143] For example, please refer to Figure 8The distance between the dashed line a and the dashed line g2 in the figure represents the distance between the side edge of the anode tab 210 away from the second film area 222 and the corresponding side edge of the first diaphragm 231, that is, the OH of the first diaphragm 231 on one side of the width direction F2 wrapping the anode tab 210. The distance between the dashed line b and the dashed line g1 in the figure represents the distance between the side edge of the second film area 222 away from the first film area 221 and the corresponding side edge of the first diaphragm 231, that is, the OH of the first diaphragm 231 on the other side of the width direction F2 wrapping the cathode tab 220. By detecting the OH of the first diaphragm 231 on one side of the width direction F2 wrapping the anode tab 210 and the OH of the first diaphragm 231 on the other side of the width direction F2 wrapping the cathode tab 220 by the fourth detection mechanism 54, the effect of the first diaphragm 231 separating the cathode tab 220 and the anode tab 210 is guaranteed, and the risk of short circuit caused by the overlap of the anode tab 210 and the cathode tab 220 is reduced.

[0144] The distance between the dashed line c2 and the dashed line a in the figure represents the distance between the side edge of the first film area 221 away from the second film area 222 and the corresponding side edge of the anode tab 210, that is, the OH of the first film area 221 on one side of the width direction F2 of the anode tab 210 wrapping the cathode tab 220 (on the side away from the lug 260 of the cathode tab 220). By detecting the OH of the first film area 221 on one side of the width direction F2 of the anode tab 210 wrapping the cathode tab 220 by the fourth detection mechanism 54, the requirement that the first film area 221 on one side of the width direction F2 of the anode tab 210 exceeds the cathode tab 220 by a certain distance is met, and the risk of OH leakage is reduced.

[0145] In addition, in combination with the second detection mechanism 52, the second detection mechanism 52 can detect the distance between the side edge of the first film area 221 close to the second film area 222 and the corresponding side edge of the anode tab 210 after the compounding and edge sealing, that is, the OH of the second film area 222 on the other side of the width direction F2 of the anode tab 210 wrapping the cathode tab 220, which facilitates meeting the requirement that the second film area 222 on the other side of the width direction F2 of the anode tab 210 exceeds the first film area 221 of the cathode tab 220 by a certain distance, and further reduces the risk of OH leakage.

[0146] Therefore, by cooperation of the fourth detection mechanism 54 and the second detection mechanism 52, the OH of the first diaphragm 231 wrapping the anode tab 210, the OH of the anode tab 210 wrapping the cathode tab 220, and the OH of the first diaphragm 231 wrapping the cathode tab 220 after compounding and edge sealing can be detected, and the risk of OH leakage is reduced.

[0147] In some embodiments, as shown in Figure 3 , Figures 5-6 and Figure 9 , Figure 9Fig. 2 is a schematic view of a partial structure at the second detection mechanism 52 in the second embodiment of the present application. The second detection mechanism 52 includes a first detector 521 and a second detector 522. The first detector 521 is arranged on the side of the cathode tab 220 facing away from the first separator 231, and is used to detect at least the edge position of the first film region 221 on the side away from the second film region 222, the edge position of the first film region 221 on the side close to the second film region 222, and the edge position of the second film region 222 on the side away from the first film region 221. The second detector 522 is arranged on the side of the second separator 232 facing away from the anode tab 210, and is used to detect at least the edge position of the anode tab 210 on the side corresponding to the second film region 222.

[0148] Please refer to Figure 5 and Figure 9 , the first detector 521 and the second detector 522 are arranged on both sides of the material thickness direction F1 of the electrode assembly 200, and the edge of the first film region 221 and the second film region 222 on the cathode tab 220 in the width direction F2 can be detected by the first detector 521, and the edge of the anode tab 210 close to the second film region 222 can be detected by the second detector 522, which is beneficial to detect whether the relative position of the anode tab 210 and the cathode tab 220 after the compounding and sealing is accurate, for example, whether the anode tab 210 on the side in the width direction F2 exceeds the edge of the cathode tab 220 by a certain distance.

[0149] For example, please refer to Figure 9 , the edge position of the first film region 221 on the side away from the second film region 222 is shown by the dashed line d in the figure, the edge position of the first film region 221 on the side close to the second film region 222 is shown by the dashed line e in the figure, the edge position of the second film region 222 on the side away from the first film region 221 is shown by the dashed line f in the figure, and the edge position of the anode tab 210 on the side corresponding to the second film region 222 is shown by the dashed line h in the figure. The distance between the dashed line e and the dashed line h in the figure represents the OH of the anode tab 210 on the side in the width direction F2 exceeding the second film region 222.

[0150] Therefore, by cooperation of the first detector 521 and the second detector 522, whether the relative position of the anode tab 210 and the cathode tab 220 after the compounding and sealing is accurate, for example, whether the anode tab 210 on the side in the width direction F2 exceeds the edge of the cathode tab 220 by a certain distance, can be detected, which reduces the risk of OH leakage and killing, and the effect of solving the problem of lithium precipitation is better.

[0151] The detection mechanism can include a line array camera or a plane array camera. The image acquisition range of the line array camera is larger, so as shown in Figure 5 , one line array camera can be arranged on each side of the material thickness direction F1; the image acquisition range of the plane array camera is smaller, so as shown in Figure 9As shown, an area array camera can be installed at both ends of the electrode on one side of the material thickness direction F1, and another area array camera can be installed at the corresponding part of the second film region 222 on the other side of the material thickness direction F1. It can detect OH on the edge of the anode electrode 210 corresponding to the second film region 222 beyond the first film region 221, and has a wide range of selection for the type of detection mechanism.

[0152] It is worth noting that after lamination and edge sealing, the cathode electrode 220, the first diaphragm 231, the anode electrode 210, and the second diaphragm 232 are stacked together, with the cathode electrode 220, the first diaphragm 231, and the anode electrode 210 being laminated and connected together. This is done to clearly show the relative positions of the various materials. Figure 9 The cathode electrode 220, the first diaphragm 231, and the anode electrode 210 are separated by a certain gap.

[0153] According to some embodiments of this application, such as Figure 3 and Figures 10-11 As shown, Figure 10 for Figure 3 A partial structural diagram of location 55 at the Fifth Testing Agency of China. Figure 11 for Figure 3 A schematic diagram of the fifth detection mechanism 55 is shown. The winding equipment 100 also includes a fifth detection mechanism 55. The fifth detection mechanism 55 is located on one side of the winding mechanism 60 and is used to detect the relative positions of the anode plate 210 and cathode plate 220 of two adjacent turns of electrode assembly 200 on the winding mechanism 60.

[0154] The fifth testing agency 55 tests the relative positions of the anode electrode 210 and cathode electrode 220 of two adjacent turns in the wound electrode assembly 200, which improves the anti-lithiation effect of the anode electrode 210 and cathode electrode 220 of the wound electrode assembly 200, further reduces the risk of OH leakage and improves the quality of the electrode assembly 200.

[0155] In some embodiments, such as Figures 10-11 As shown, the fifth detection mechanism 55 is positioned toward the connection 250 between the electrode assembly 200 in front of the winding mechanism 60 and the electrode assembly 200 on the winding mechanism 60. The fifth detection mechanism 55 is used to detect the position of the anode plate 210 of the electrode assembly 200 in front of the winding mechanism 60 and the position of the cathode plate 220 of the electrode assembly 200 on the winding mechanism 60; alternatively, the fifth detection mechanism 55 is used to detect the position of the cathode plate 220 of the electrode assembly 200 in front of the winding mechanism 60 and the position of the anode plate 210 of the electrode assembly 200 on the winding mechanism 60.

[0156] The electrode assembly 200 in front of the winding mechanism 60 refers to the electrode assembly 200 about to be wound on the winding mechanism 60, i.e. the electrode assembly 200 of the outer circle of the two adjacent circles of the electrode assembly 200; the electrode assembly 200 on the winding mechanism 60 refers to the electrode assembly 200 just wound on the winding mechanism 60, i.e. the electrode assembly 200 of the inner circle of the two adjacent circles of the electrode assembly 200. Thus, the fifth detection mechanism 55 can detect the relative positions of the anode tab 210 and the cathode tab 220 of any two adjacent circles of the multiple circles of the electrode assembly 200 during winding, realize comprehensive detection of the entire wound electrode assembly 200, reduce OH leakage and kill, and have better effect.

[0157] The fifth detection mechanism 55 is arranged towards the connection 250 of the electrode assembly 200 in front of the winding mechanism 60 and the electrode assembly 200 on the winding mechanism 60, i.e. the detection area of the fifth detection mechanism 55 is towards the connection 250, which can simultaneously detect the electrode assembly 200 in front of the winding mechanism 60 and the electrode assembly 200 on the winding mechanism 60, without the need to arrange a detector for the electrode assembly 200 in front of the winding mechanism 60 and the electrode assembly 200 on the winding mechanism 60 respectively, which is conducive to saving a detector and has better economy.

[0158] The fifth detection mechanism 55 is used to detect the position of the anode tab 210 of the electrode assembly 200 in front of the winding mechanism 60 and the position of the cathode tab 220 of the electrode assembly 200 on the winding mechanism 60, or the fifth detection mechanism 55 is used to detect the position of the anode tab 210 of the electrode assembly 200 in front of the winding mechanism 60 and the position of the cathode tab 220 of the electrode assembly 200 on the winding mechanism 60, i.e. the stacking order of the anode tab 210 and the cathode tab 220 in the electrode assembly 200 can be flexibly arranged, and the fifth detection mechanism 55 has better adaptability to electrode assemblies 200 with different stacking orders.

[0159] For example Figures 10-11 As shown in the figure, in each circle of the electrode assembly 200, the cathode tab 220, the first diaphragm 231, the anode tab 210 and the second diaphragm 232 are sequentially arranged from the outside to the inside along the radial direction of the winding mechanism 60, at this time, the anode tab 210 on the radial inner side of the electrode assembly 200 in front of the winding mechanism 60 is easy to detect and the cathode tab 220 on the radial outer side of the electrode assembly 200 on the winding mechanism 60 is easy to detect, therefore, the fifth detection mechanism 55 is used to detect the position of the anode tab 210 of the electrode assembly 200 in front of the winding mechanism 60 and the position of the cathode tab 220 of the electrode assembly 200 on the winding mechanism 60, which is conducive to improving the accuracy of detection.

[0160] For example, in each turn of the electrode assembly 200, the second diaphragm 232, the anode plate 210, the first diaphragm 231, and the cathode plate 220 are arranged radially from the outside to the inside along the winding mechanism 60. At this time, the cathode plate 220 on the radially inner side of the front electrode assembly 200 of the winding mechanism 60 is easy to detect, and the anode plate 210 on the radially outer side of the upper electrode assembly 200 of the winding mechanism 60 is easy to detect. Therefore, the fifth detection mechanism 55 is used to detect the position of the cathode plate 220 of the front electrode assembly 200 of the winding mechanism 60 and the position of the anode plate 210 of the upper electrode assembly 200 of the winding mechanism 60, which helps to improve the accuracy of detection.

[0161] In some embodiments, such as Figure 3 As shown, the winding equipment 100 may further include a correction mechanism 90, which is located between the sealing mechanism 40 and the winding mechanism 60. When the fifth detection mechanism 55 detects a misalignment between the anode electrode 210 and the cathode electrode 220 of two adjacent turns of the electrode assembly 200, the correction mechanism 90 can correct the transmission position of the strip electrode assembly 200 to correct the relative position of the two turns of the electrode assembly 200 after winding, thereby reducing OH leakage caused by electrode misalignment or overall misalignment of the electrode assembly 200 after composite winding.

[0162] According to some embodiments of this application, such as Figure 3 As shown, the winding apparatus 100 also includes a cutting mechanism 70 and a buffer mechanism 80. The cutting mechanism 70 is disposed between the sealing mechanism 40 and the winding mechanism 60, and is used to cut the electrode assembly 200. The buffer mechanism 80 is disposed between the composite mechanism 30 and the sealing mechanism 40, and is used to buffer the composite sheet 240.

[0163] The cutting mechanism 70 may include components such as a cutting roller and a cutting blade, and only needs to be able to cut the electrode assembly 200. The cutting mechanism 70 is located between the edge sealing mechanism 40 and the winding mechanism 60, and can cut the unwound strip electrode assembly 200 into multiple independent electrode assemblies 200. The buffer mechanism 80 can store the composite sheet 240 that has been composited by the composite mechanism 30 through winding, stacking, or other methods.

[0164] During the production process, the buffer mechanism 80 buffers materials and continuously conveys them downstream, enabling the cutting mechanism 70 to perform cutting operations without deceleration, unaffected by the complex operations upstream of the buffer mechanism 80. For example... Figure 3As shown, the composite precision requirement is high, resulting in a slower operation speed, the buffer mechanism 80 is used to buffer the composite sheet 240 after the cathode sheet 220, the first diaphragm 231 and the anode sheet 210 are compounded, and the cutting mechanism 70 is used to cut the second diaphragm 232 connected between adjacent electrode assemblies 200, which has a lower precision requirement and a faster operation rate. Through the buffering of the buffer mechanism 80, the buffer mechanism 80 can stably and continuously deliver the composite sheet 240 to the edge sealing mechanism 40, without reducing the edge sealing rate, and thus the cutting mechanism 70 can cut the strip-shaped electrode assembly 200 without deceleration, thereby improving the winding efficiency and the overall production capacity.

[0165] According to some embodiments of the present application, as shown in Figure 3 and Figure 12 , Figure 12 is Figure 3 a detection schematic diagram of the sixth detection mechanism 56. The first unwinding mechanism 10 includes an anode unwinding mechanism 12 for unwinding the anode sheet 210. The winding device 100 further includes a sixth detection mechanism 56, which is arranged between the anode unwinding mechanism 12 and the composite mechanism 30 and is used to detect the state of the anode sheet 210.

[0166] The anode unwinding mechanism 12 can carry and release the anode sheet 210. The sixth detection mechanism 56 is arranged between the anode unwinding mechanism 12 and the composite mechanism 30, i.e., the sixth detection mechanism 56 is arranged downstream of the anode unwinding mechanism 12 and upstream of the composite mechanism 30, which can detect the unshielded anode sheet 210 without composite operation, and the detection of the state of the anode sheet 210 is more accurate.

[0167] The state of the anode sheet 210 includes but is not limited to the width of the active material layer of the anode sheet 210, known defective sheets (such as yellow marked defective sheets), sheet damage, etc. Through the detection of the sixth detection mechanism 56, the defective part of the anode sheet 210 can be found and removed in time, thereby improving the quality of the anode sheet 210 for the electrode assembly 200, and reducing the subsequent material waste. For example, if the defective part of the anode sheet 210 is detected before the composite, only the part of the anode sheet 210 needs to be removed, and if the defective part of the anode sheet 210 in the composite sheet 240 is detected after the composite, the cathode sheet 220 and the first diaphragm 231 compounded with the anode sheet 210 need to be removed together. Therefore, by detecting the state of the anode sheet 210 through the sixth detection mechanism 56 before the composite, the waste of the cathode sheet 220 and the first diaphragm 231 can be at least reduced, and the continuous unwinding of the second diaphragm 232 and the connection between multiple unwound electrode assemblies 200 through the second diaphragm 232 are facilitated.

[0168] In some embodiments, downstream of the first detection mechanism 51, the third detection mechanism 53 and the sixth detection mechanism 56, a mechanism for cutting off the material can be arranged to timely remove the defective part of the material according to the detection result of the detection mechanism, so as to improve the quality of the material.

[0169] According to some embodiments of the present application, as shown in Figure 3 and Figure 8 The winding device 100 further comprises a detection mechanism and a calibration mechanism. The detection mechanism comprises at least one of the first detection mechanism 51, the second detection mechanism 52, the third detection mechanism 53, the fourth detection mechanism 54, the fifth detection mechanism 55 and the sixth detection mechanism 56. The calibration mechanism is arranged on one side of the detection mechanism and is used to detect the position of the detection mechanism and issue a prompt information in the state that the position of the detection mechanism is deviated, and the calibration mechanism is also used to provide a reference line (for example, the dashed line k shown in Figure 8 The detection mechanism detects the position of the anode pole piece 210, the cathode pole piece 220, the first diaphragm 231 and the second diaphragm 232 according to the reference line.

[0170] The detection mechanism can comprise one or more of the first detection mechanism 51, the second detection mechanism 52, the third detection mechanism 53, the fourth detection mechanism 54, the fifth detection mechanism 55 and the sixth detection mechanism 56, and the detection mechanism can also comprise other detection mechanisms in addition to the first detection mechanism 51, the second detection mechanism 52, the third detection mechanism 53, the fourth detection mechanism 54, the fifth detection mechanism 55 and the sixth detection mechanism 56. The calibration mechanism is arranged corresponding to at least one of the detection mechanisms.

[0171] In some related technologies, the detection mechanism is installed by means of a cantilever support, and in the long-term use process, the cantilever support can be deformed, loose, worn and other problems, resulting in the data collected by the detection mechanism being distorted and the resolution of the detection mechanism being changed. However, by arranging the calibration mechanism, the position of the detection mechanism can be detected during the use of the detection mechanism, and when the position of the detection mechanism is deviated, a prompt information is issued and the detection mechanism is stopped to work, prompting the staff to adjust, which is beneficial to reduce the risk of data collected by the detection mechanism being distorted and other problems, and improve the detection accuracy of the detection mechanism.

[0172] The calibration mechanism is also used to provide a reference line, so that the detection mechanism can determine the position of the material according to the data of the reference line and the edges of the material such as the anode tab 210, the cathode tab 220, the first separator 231 and the second separator 232, for example, detecting the data of the reference line and the edge of the anode tab 210 and theoretically calculating the distance between the reference line and the edge of the anode tab 210 to determine the position of the anode tab 210. The reference line will not be offset due to the position offset of the detection mechanism, the offset of the material, etc., so that the position of the material obtained through the reference line is more accurate, the detection accuracy of the detection mechanism is improved, and the position of the detection mechanism is calibrated through the reference line to determine whether the detection mechanism is offset or loose, and the detection accuracy of the position of the detection mechanism by the calibration mechanism is improved.

[0173] For example, in some embodiments, each detection mechanism is provided with a corresponding calibration mechanism, so that the detection accuracy of each detection mechanism is improved. In some embodiments, the reference line of the calibration mechanism penetrates the entire field of view of the detection mechanism, so that the detection mechanism can more easily detect the position of the reference line. In some embodiments, the calibration mechanism includes a laser calibrator or a fixed-size calibration block to detect the position of the calibration mechanism. For example, after adjusting the brightness and angle of the light source of the detection mechanism to the best effect, each pixel point of the detection mechanism is calibrated through the laser calibrator or the fixed-size calibration block to determine the value range of the optimal position of the detection mechanism. When the resolution of a single pixel point of the detection mechanism changes, it means that the detection mechanism has been skewed, and the calibration mechanism generates a prompt to prompt the staff to adjust the position of the detection mechanism.

[0174] Therefore, in the above technical solution, by providing the calibration mechanism, the position of the detection mechanism can be detected during use, the risk of the detection mechanism being offset and other problems is reduced, the risk of the data collected by the detection mechanism being distorted due to the position offset is reduced, and the calibration mechanism can provide a reference line, which facilitates the detection mechanism to determine the position of the material according to the reference line. The reference line will not be offset due to the position offset of the detection mechanism, which facilitates the calibration of the position of the detection mechanism through the reference line to determine whether the detection mechanism is offset, and improves the position accuracy and detection accuracy of the detection mechanism.

[0175] The production method of the battery monomer according to the embodiments of the present application comprises:

[0176] The cathode tab, the first separator and the anode tab are laminated and subjected to a compounding process to obtain a composite sheet;

[0177] The second separator is continuously unwound and arranged on the side of the anode tab away from the first separator, and the first separator and the second separator are edge-connected to obtain an unwound electrode assembly;

[0178] The unwound electrode assembly is wound, the wound electrode assembly is loaded into a case and an electrolyte is injected to obtain a battery cell.

[0179] The production method according to the embodiments of the present application is described below by taking the winding device 100 according to the embodiments of the present application as an example, and the production of the electrode assembly 200 by using other winding devices is understandable to those skilled in the art according to the following description. It is worth noting that all the contents of the winding device 100 according to the embodiments of the present application are applicable to the production method of the battery cell according to the embodiments of the present application.

[0180] The cathode tab 220 and the first separator 231 can be compounded by the compounding mechanism 30, and the anode tab 210 and the first separator 231 are compounded on the side away from the cathode tab 220, and the first separator 231 is located between the anode tab 210 and the cathode tab 220. That is, the cathode tab 220, the first separator 231 and the anode tab 210 are connected together, for example, the connection can be realized by heating, pressing and the like, reducing the deviation of the cathode tab 220 relative to the first separator 231 and the deviation of the anode tab 210 relative to the first separator 231 during winding and use, which is beneficial to improve the accuracy of the relative position between the materials.

[0181] The second separator 232 and the part of the first separator 231 of the compound sheet 240 beyond the anode tab 210 can be edge-sealed by the edge sealing mechanism 40 to obtain the unwound electrode assembly 200. That is, the first separator 231 and the second separator 232 are connected together, for example, the connection of the separators can be realized by heating, pressing, pasting and the like. Through the edge sealing connection, the first separator 231 and the second separator 232 will not separate to expose the anode tab 210 when the external force is removed, the separator is not easy to fold during the winding of the electrode assembly 200, and is not easy to be disturbed by the cavity during the liquid injection process, effectively reducing the risk of the anode tab 210 overlapping with the cathode tab 220 and the anode tab 210 overlapping with the case 320 of the battery cell 310, and improving the problem of lithium precipitation.

[0182] The second separator 232 can be continuously unwound, so that the second separator 232 at the head and tail of each electrode assembly 200 after the edge sealing exceeds the edge of the anode tab 210, for example, the first separator 231 and the second separator 232 at the head and tail of the anode tab 210 are edge sealed and the second separator 232 exceeds the jelly roll 240, a plurality of unwound electrode assemblies 200 are connected together through the continuous second separator 232, which can assist in conveying the unwound electrode assemblies 200 and improve the consistency and stability of the electrode assemblies 200 during conveying. And the anode tab 210 of the electrode assembly 200 during winding and after winding can be wrapped by two separators and is not easy to expose, the effect of separating the cathode tab 220 and the anode tab 210 during production is better, and the risk of overlapping the anode tab 210 and the cathode tab 220 and the shell 320 of the battery monomer 310 is effectively reduced.

[0183] The unwound electrode assembly 200 obtained after the compounding and edge sealing treatment can be wound by the winding mechanism 60, so that the electrode assembly 200 can be placed in the shell 320 after being wound and molded, and electrolyte is injected into the shell 320 to obtain the battery monomer 310. For example, the winding needle 61 of the winding mechanism 60 is rotated to wind the strip-shaped electrode assembly 200, and different shapes of electrode assemblies 200 are formed according to different shapes of winding needles 61.

[0184] In this way, according to the production method of the battery monomer 310 of the embodiment of the application, the cathode tab 220, the first separator 231 and the anode tab 210 are compounded to form the jelly roll 240, so that the cathode tab 220, the first separator 231 and the anode tab 210 are not easy to deviate, the first separator 231 and the second separator 232 are edge sealed and connected, so that the first separator 231 and the second separator 232 wrap the anode tab 210 to reduce the risk of exposure of the anode tab 210, and the second separator 232 is continuously unwound to exceed the tab at the head and tail to better wrap the anode tab 210, so that the anode tab 210 is not easy to expose to reduce the risk of overlapping the anode tab 210 with the cathode tab 220 and the shell 320 of the battery monomer 310, and a plurality of electrode assemblies 200 during conveying can be connected through the second separator 232, improve the stability of conveying, and the consistency of a plurality of electrode assemblies 200 after winding and molding is good.

[0185] In some embodiments of the application, the above production method detects the state of the cathode tab 220 toward the first separator 231 side before compounding.

[0186] The state of the cathode electrode tab 220 toward the first separator 231 includes, but is not limited to, the width of the active material layer of the surface of the cathode electrode tab 220 toward the first separator 231, known bad electrode tabs (such as those with a yellow label), electrode tab breakage, and the like. For example, a third detection mechanism 53 can be provided between the cathode unwinding mechanism 11 and the compounding mechanism 30, and the third detection mechanism 53 is arranged on the side of the cathode electrode tab 220 toward the first separator 231 and is used to detect the state of the cathode electrode tab 220 toward the first separator 231.

[0187] By detecting, the part of the cathode electrode tab 220 toward the first separator 231 with defects can be found and removed in time, thereby improving the quality of the cathode electrode tab 220 used for the electrode assembly 200.

[0188] In some embodiments, in the above production method, the state of the anode electrode tab 210 is detected before the compounding process.

[0189] The state of the anode electrode tab 210 includes, but is not limited to, the width of the active material layer of the anode electrode tab 210, known bad electrode tabs (such as those with a yellow label), electrode tab breakage, and the like. For example, a sixth detection mechanism 56 can be provided between the anode unwinding mechanism 12 and the compounding mechanism 30, and the sixth detection mechanism 56 is used to detect the state of the anode electrode tab 210.

[0190] By detecting, the part of the anode electrode tab 210 with defects can be found and removed in time, thereby improving the quality of the anode electrode tab 210 used for the electrode assembly 200.

[0191] In some embodiments, in the above production method, the state of the compound tab 240 is detected after the compounding process and before the edge sealing process.

[0192] The compounding mechanism 30 compounds the cathode electrode tab 220, the first separator 231, and the anode electrode tab 210 to form a compound tab 240, and the compound tab 240 is conveyed to the edge sealing mechanism 40 to be connected to the second separator 232. The compound tab 240 refers to the tab body obtained by compounding the cathode electrode tab 220, the first separator 231, and the anode electrode tab 210 through the compounding mechanism 30, so that the relative positions of the cathode electrode tab 220, the first separator 231, and the anode electrode tab 210 are fixed, and the cathode electrode tab 220, the first separator 231, and the anode electrode tab 210 can be conveyed synchronously without being easily offset, which is beneficial to improving the positional accuracy of the cathode electrode tab 220 and the anode electrode tab 210 in the production process.

[0193] The state of the compound tab 240 includes, but is not limited to, compounding defects such as tab and separator corner, breakage, bruising, and wrinkling. For example, a first detection mechanism 51 can be provided between the compounding mechanism 30 and the edge sealing mechanism 40, and the first detection mechanism 51 is used to detect the state of the compound tab 240.

[0194] By detecting, the part with defects of the jelly-roll 240 can be found and removed in time, thereby improving the quality of the cathode electrode sheet 220, the first separator 231 and the anode electrode sheet 210 for the electrode assembly 200.

[0195] In some embodiments, in the above production method, after the edge sealing treatment, the edge sealing state, the state of the cathode electrode sheet 220 on the side away from the first separator 231, the relative position of the anode electrode sheet 210 and the cathode electrode sheet 220, and the relative position of the first separator 231 and the cathode electrode sheet 220 are detected.

[0196] The edge sealing state includes but is not limited to the electrode sheet corner, the head and tail part crimping, the separator misalignment, the first separator 231 and the second separator 232 not completely wrapping the anode electrode sheet 210 to expose part of the anode electrode sheet 210, and other edge sealing defects, the state of the cathode electrode sheet 220 on the side away from the first separator 231 includes but is not limited to the width of the active material layer on the surface of the cathode electrode sheet 220 on the side away from the first separator 231, the relative position of the anode electrode sheet 210 and the cathode electrode sheet 220 includes but is not limited to the OH of the anode electrode sheet 210 edge wrapping the cathode electrode sheet 220, and the relative position of the first separator 231 and the cathode electrode sheet 220 includes but is not limited to the OH of the first separator 231 edge wrapping the cathode electrode sheet 220.

[0197] For example, a second detection mechanism 52 can be arranged between the edge sealing mechanism 40 and the winding mechanism 60, and the second detection mechanism 52 is used to detect the edge sealing state, the state of the cathode electrode sheet 220 on the side away from the first separator 231, the relative position of the anode electrode sheet 210 and the cathode electrode sheet 220, and the relative position of the first separator 231 and the cathode electrode sheet 220.

[0198] By detecting, the part with defects of the electrode assembly 200 that has not been wound can be found and removed in time, the risk of OH leakage is reduced, and the quality of the electrode assembly 200 is improved.

[0199] In some embodiments, in the above production method, during the winding process, the relative position of the anode electrode sheet 210 and the cathode electrode sheet 220 of two adjacent turns of the electrode assembly 200 is detected, and the relative position of the anode electrode sheet 210 and the cathode electrode sheet 220 of the same turn of the electrode assembly 200 is detected.

[0200] The strip-shaped uncoiled electrode assembly 200 obtained by the compounding and edge sealing can be coiled by the coiling mechanism 60, and the coiled electrode assembly 200 can be placed in the housing 320 of the battery monomer 310 for use. The relative positions of the anode tab 210 and the cathode tab 220 of the adjacent two turns of the electrode assembly 200 include but are not limited to the OH of the edge of the anode tab 210 wrapping the cathode tab 220 of the adjacent two turns of the electrode assembly 200, and the relative positions of the anode tab 210 and the cathode tab 220 of the same turn of the electrode assembly 200 include but are not limited to the OH of the edge of the anode tab 210 wrapping the cathode tab 220 of the same turn of the electrode assembly 200.

[0201] For example, the fourth detection mechanism 54 can be arranged on one side of the coiling mechanism 60, and the fifth detection mechanism 55 can be arranged on the other side of the coiling mechanism 60, and the detection area of the fifth detection mechanism 55 faces the connection 250 of the electrode assembly 200 in front of the coiling mechanism 60 and the electrode assembly 200 on the coiling mechanism 60.

[0202] The fourth detection mechanism 54 can detect the relative positions of the anode tab 210 and the cathode tab 220 of the same turn of the electrode assembly 200 on the coiling mechanism 60, and the fifth detection mechanism 55 can detect the relative positions of the anode tab 210 and the cathode tab 220 of the adjacent two turns of the electrode assembly 200 on the coiling mechanism 60. For example, the fifth detection mechanism 55 can detect the position of the anode tab 210 of the electrode assembly 200 in front of the coiling mechanism 60 and the position of the cathode tab 220 of the electrode assembly 200 on the coiling mechanism 60, or the fifth detection mechanism 55 can detect the position of the anode tab 210 of the electrode assembly 200 in front of the coiling mechanism 60 and the position of the cathode tab 220 of the electrode assembly 200 on the coiling mechanism 60, which can be determined according to the stacking order of the anode tab 210 and the cathode tab 220 in the electrode assembly 200.

[0203] By detecting the relative positions of the anode tab 210 and the cathode tab 220 of the same turn and the adjacent two turns of the electrode assembly 200 during the coiling process, the lithium precipitation resistance of the anode tab 210 and the cathode tab 220 of the coiled electrode assembly 200 is better, further reducing the risk of OH leakage, and improving the quality of the electrode assembly 200.

[0204] The coiling device 100 according to one specific embodiment of the present application will be described below with reference to the accompanying drawings.

[0205] As Figures 3-8 and Figures 10-12As shown, the winding device 100 according to one embodiment of the present application comprises a first unwinding mechanism 10, a second unwinding mechanism 20, a compounding mechanism 30, an edge sealing mechanism 40, a first detection mechanism 51, a second detection mechanism 52, a third detection mechanism 53, a fourth detection mechanism 54, a fifth detection mechanism 55, a sixth detection mechanism 56, a buffer mechanism 80, a deviation rectifying mechanism 90, a cutting mechanism 70, a winding mechanism 60, and conveying rollers arranged between the mechanisms for conveying materials. The first unwinding mechanism 10 comprises a cathode unwinding mechanism 11, a first diaphragm unwinding mechanism 13, and an anode unwinding mechanism 12, wherein the first diaphragm unwinding mechanism 13 is used to carry and release the first diaphragm 231.

[0206] The cathode tab 220, the first diaphragm 231, and the anode tab 210 are compounded by the compounding mechanism 30 to form a compound sheet 240, which is connected to the second diaphragm 232 by the edge sealing mechanism 40 to obtain an unwound electrode assembly 200, which is finally wound into an electrode assembly 200 at the winding mechanism 60. The continuous unwinding of the second diaphragm 232 by the second unwinding mechanism 20 enables the second diaphragm 232 to exceed the edges of the tabs at the beginning and end of each electrode assembly 200 after edge sealing, for example, enabling the first diaphragm 231 and the second diaphragm 232 to be edge sealed at the beginning and end of the anode tab 210 and enabling the second diaphragm 232 to exceed the compound sheet 240, so that the anode tab 210 of each electrode assembly 200 is wrapped by two diaphragms and is not easily exposed, effectively reducing the risk of the anode tab 210 overlapping the cathode tab 220 and the anode tab 210 overlapping the shell 320 of the battery monomer 310, and the continuous unwinding of the second diaphragm 232 enables multiple unwound electrode assemblies 200 to be connected together, assisting in conveying the unwound electrode assemblies 200 and improving the consistency and stability of the electrode assemblies 200 during conveying.

[0207] As shown in Figure 3 and Figure 6 The third detection mechanism 53 is installed between the cathode unwinding mechanism 11 and the compounding mechanism 30 and is used to detect the second film area 222 width of the cathode tab 220 toward the first diaphragm 231 side, yellow label defective products, tab damage, and the like. As shown in Figure 3 and Figure 12 The sixth detection mechanism 56 is installed between the anode unwinding mechanism 12 and the compounding mechanism 30 and is used to detect the active material layer width of the anode tab 210, yellow label defective products, tab damage, and the like. As shown in Figures 3-4 The first detection mechanism 51 is installed between the compounding mechanism 30 and the buffer mechanism 80 and the edge sealing mechanism 40 and is used to detect the compounding state of the compound sheet 240, such as the anode tab 210 being crushed, the anode tab 210 having a corner, the first diaphragm 231 wrapping the anode tab 210, and OH.

[0208] As shown in Figure 3 andFigure 5 As shown in the figure, the second detection mechanism 52 is installed between the sealing mechanism 40 and the deviation correction mechanism 90, and is used to detect the sealing state of the edge-sealed anode tab sheet 210, such as the OH, the tab corner, the head-tail wrinkling, etc. of the first diaphragm 231 and the second diaphragm 232. The second detection mechanism 52 is also used to detect the tab state of the cathode tab sheet 220, such as the second diaphragm area 222 width on the side of the cathode tab sheet 220 facing away from the first diaphragm 231, the yellow mark defective product, the tab breakage, etc. The second detection mechanism 52 is also used to detect the relative position of the first diaphragm 231 and the cathode tab sheet 220, such as the OH of the first diaphragm 231 wrapping the cathode tab sheet 220, the relative position of the anode tab sheet 210 and the cathode tab sheet 220, such as the OH of the anode tab sheet 210 wrapping the cathode tab sheet 220 (i.e. the size of the two side edges of the active material layer of the anode tab sheet 210 exceeding the two side edges of the second diaphragm area 222 of the cathode tab sheet 220 in the width direction F2 and the length direction F3), etc.

[0209] As shown in the figure, Figure 3 and Figures 7-8 The fourth detection mechanism 54 is installed downstream of the sealing mechanism 40, the deviation correction mechanism 90 and the cutting mechanism 70, on the side of the winding mechanism 60, and is used to detect the relative position of the anode tab sheet 210 and the cathode tab sheet 220 of the same coil of electrode assembly 200, such as the double-sided OH of the anode tab sheet 210 wrapping the cathode tab sheet 220 in the same coil of electrode assembly 200.

[0210] As shown in the figure, Figure 3 and Figures 10-11 The fifth detection mechanism 55 is installed downstream of the sealing mechanism 40, the deviation correction mechanism 90 and the cutting mechanism 70, on the other side of the winding mechanism 60, and the detection area of the fifth detection mechanism 55 faces the connection 250 of the electrode assembly 200 before the winding mechanism 60 and the electrode assembly 200 on the winding mechanism 60, and is used to detect the relative position of the anode tab sheet 210 and the cathode tab sheet 220 of the adjacent two coils of electrode assembly 200, such as the position of the anode tab sheet 210 of the electrode assembly 200 before the winding mechanism 60 and the position of the cathode tab sheet 220 of the electrode assembly 200 on the winding mechanism 60. Through the fifth detection mechanism 55, the double-sided OH of the anode tab sheet 210 wrapping the cathode tab sheet 220 between the adjacent two coils of electrode assembly 200 can be detected, and the risk of OH leakage is reduced.

[0211] In the above embodiment, the electrode assembly 200 can be obtained by the composite edge sealing, the risk of separation of the cathode tab 220, the first separator 231, the anode tab 210 and the second separator 232 can be reduced, and the risk of partial exposure of the anode tab 210 to the cathode tab 220 and the shell 320 of the battery monomer 310 can be reduced. The continuous unwinding of the second separator 232 can be realized, the first separator 231 and the second separator 232 are edge sealed at the head and tail of the anode tab 210, and the second separator 232 exceeds the composite sheet 240, which can further reduce the risk of partial exposure of the anode tab 210, connect multiple unwound electrode assemblies 200 together, assist in conveying the unwound electrode assembly 200, improve the consistency and stability of the electrode assembly 200 during conveying, and improve the quality of the multiple electrode assemblies 200 after winding. The comprehensive detection of the electrode assembly 200 produced by the composite edge sealing winding method can be realized, the risk of tab OH leakage and the risk of material wrinkling, tab bruising and other defects can be reduced.

[0212] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0213] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A winding apparatus characterized by comprising: The application relates to a winding device for producing an electrode assembly, comprising: a first unwinding mechanism for unwinding a cathode electrode sheet, a first separator and an anode electrode sheet; a second unwinding mechanism for unwinding a second separator; a combining mechanism arranged downstream of the first unwinding mechanism and for combining the cathode electrode sheet, the first separator and the anode electrode sheet to form a combined sheet, wherein the first separator is arranged between the anode electrode sheet and the cathode electrode sheet; an edge sealing mechanism arranged downstream of the combining mechanism and the second unwinding mechanism and for edge sealing the second separator to the edge of the first separator of the combined sheet to obtain an unrolled electrode assembly; a winding mechanism arranged downstream of the edge sealing mechanism and for winding the unrolled electrode assembly.

2. The winding apparatus according to claim 1, characterized by Further comprising: a first detection mechanism arranged downstream of the combining mechanism and for detecting at least a combined state.

3. The winding apparatus according to claim 2, wherein The combined state comprises the state of the anode electrode sheet and the first separator.

4. The winding apparatus according to claim 1, wherein Further comprising: a second detection mechanism arranged downstream of the edge sealing mechanism and for detecting at least an edge sealing state.

5. The winding apparatus according to claim 4, wherein The second detection mechanism is further arranged for detecting the relative position of the cathode electrode sheet and the anode electrode sheet, the relative position of the first separator and the cathode electrode sheet, and the relative position of the second separator and the anode electrode sheet.

6. The winding apparatus according to claim 4, wherein The first unwinding mechanism comprises a cathode unwinding mechanism for unwinding the cathode electrode sheet, and the winding device further comprises: a third detection mechanism arranged between the cathode unwinding mechanism and the combining mechanism and for detecting the state of the cathode electrode sheet.

7. The winding apparatus according to claim 6, wherein The third detection mechanism is arranged on the side of the cathode electrode sheet facing the first separator and for detecting the state of the side of the cathode electrode sheet facing the first separator, and the second detection mechanism is arranged for detecting the state of the side of the cathode electrode sheet facing away from the first separator.

8. The winding apparatus according to claim 6, wherein The active material layer of the cathode electrode sheet comprises a first film region and a second film region, and the second film region is arranged on the side of the first film region close to the tab of the cathode electrode sheet, The state of the cathode electrode sheet comprises the width of the first film region, the width of the second film region and the defect of the cathode electrode sheet on the side of the cathode electrode sheet facing the first separator.

9. The winding apparatus according to claim 4, wherein Further comprising: a fourth detection mechanism arranged on one side of the winding mechanism and for detecting the relative position of the anode electrode sheet and the cathode electrode sheet of the same turn of the electrode assembly on the winding mechanism.

10. The winding apparatus according to claim 9, wherein The active material layer of the cathode electrode sheet comprises a first film region and a second film region, and the second film region is arranged on the side of the first film region close to the tab of the cathode electrode sheet, The fourth detection mechanism is arranged for detecting the distance between the side edge of the second film region away from the first separator and the corresponding side edge of the first separator, the distance between the side edge of the first film region away from the second film region and the corresponding side edge of the anode electrode sheet, and the distance between the side edge of the second film region away from the first film region and the corresponding side edge of the first separator. The second detection mechanism is used to detect the distance between the side edge of the first membrane region close to the second membrane region and the corresponding side edge of the anode tab.

11. The winding apparatus according to claim 10, wherein The second detection mechanism comprises: a first detector arranged on the side of the cathode tab away from the first separator, the first detector being used to detect at least the position of the edge of the first membrane region away from the second membrane region, the position of the edge of the first membrane region close to the second membrane region, and the position of the edge of the second membrane region away from the first membrane region; a second detector arranged on the side of the second separator away from the anode tab, the second detector being used to detect at least the position of the edge of the anode tab corresponding to the side of the second membrane region.

12. The winding apparatus according to claim 4, wherein Further comprising: a fifth detection mechanism arranged on the side of the winding mechanism and used to detect the relative positions of the anode tab and the cathode tab of the adjacent two turns of the electrode assembly on the winding mechanism.

13. The winding apparatus according to claim 12, characterized in that, The fifth detection mechanism is arranged towards the connection between the electrode assembly before the winding mechanism and the electrode assembly on the winding mechanism, wherein the fifth detection mechanism is used to detect the position of the anode tab of the electrode assembly before the winding mechanism and the position of the cathode tab of the electrode assembly on the winding mechanism; or the fifth detection mechanism is used to detect the position of the cathode tab of the electrode assembly before the winding mechanism and the position of the anode tab of the electrode assembly on the winding mechanism.

14. The winding apparatus according to any one of claims 9 to 13, characterized in that, Further comprising: a cutting mechanism arranged between the edge sealing mechanism and the winding mechanism and used to cut the electrode assembly; a buffer mechanism arranged between the compounding mechanism and the edge sealing mechanism and used to buffer the compound sheet.

15. The winding apparatus according to claim 1, wherein The first unwinding mechanism comprises an anode unwinding mechanism used to unwind the anode tab, and the winding device further comprises: a sixth detection mechanism arranged between the anode unwinding mechanism and the compounding mechanism and used to detect the state of the anode tab.

16. The winding apparatus according to any one of claims 1 to 15, characterized by, Further comprising: a detection mechanism comprising at least one of the first detection mechanism, the second detection mechanism, the third detection mechanism, the fourth detection mechanism, the fifth detection mechanism and the sixth detection mechanism; a calibration mechanism arranged on the side of the detection mechanism and used to detect the position of the detection mechanism and send a prompt message in the state that the position of the detection mechanism deviates, the calibration mechanism is further used to provide a reference line, and the detection mechanism detects the positions of the anode tab, the cathode tab, the first separator and the second separator according to the reference line.

17. A method of producing a battery cell, characterized by, comprising: stacking the cathode tab, the first separator and the anode tab and performing compounding treatment to obtain a compound sheet; continuously unwinding the second separator, stacking the second separator on the side of the anode tab away from the first separator, and connecting the first separator and the second separator by edge sealing to obtain an unwound electrode assembly; winding the unwound electrode assembly, loading the wound electrode assembly into a shell and injecting an electrolyte to obtain a battery monomer.

18. The method of producing a battery cell according to claim 17, wherein, before the compounding process, the state of the cathode electrode sheet toward the side of the first separator is detected; and / or, before the compounding process, the state of the anode electrode sheet is detected; and / or, after the compounding process and before the edge sealing process, the state of the compounded sheet is detected; and / or, after the edge sealing process, the edge sealing state, the state of the cathode electrode sheet away from the side of the first separator, the relative positions of the anode electrode sheet and the cathode electrode sheet, and the relative positions of the first separator and the cathode electrode sheet are detected; and / or, during the winding process, the relative positions of the anode electrode sheet and the cathode electrode sheet of two adjacent turns of the electrode assembly are detected, and the relative positions of the anode electrode sheet and the cathode electrode sheet of the same turn of the electrode assembly are detected.

Images