Production equipment and production method of electrode assembly

Abstract

According to the production equipment and the production method of the electrode assembly, the production equipment is used for producing the electrode assembly, the electrode assembly comprises an anode pole piece, a cathode pole piece and a diaphragm, and the production equipment comprises an edge sealing mechanism used for conducting edge sealing connection on the two side edges, in the width direction, of the diaphragm on the two sides of the anode pole piece; the compounding mechanism is used for compounding the cathode pole piece with one side, opposite to the anode pole piece, of one layer of diaphragm; the first detection mechanism is arranged at the downstream of the edge sealing mechanism and is at least used for detecting the edge sealing state; and the second detection mechanism is arranged at the downstream of the compounding mechanism and is at least used for detecting the compounding state. According to the technical scheme, more comprehensive detection can be achieved, the situation that defects are blocked and cannot be detected after the anode piece, the cathode piece and the diaphragm are stacked to form the electrode assembly is avoided, the detection accuracy is improved, and therefore the risk that the defects are missed to be killed in the production process of the electrode assembly is reduced.

Description

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202410557866.6, 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 electrode manufacturing technology, and more specifically, to a production equipment and a method for producing electrode assemblies. 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. Furthermore, inaccurate electrode detection can easily result in missed detection of OH (overhang) and defects such as electrode folding and crushing. Summary of the Invention

[0005] This application provides a production equipment and a method for producing electrode assemblies, which can achieve more comprehensive testing during the production of electrode assemblies, reduce the omission of defects, and reduce the risk of anode electrode overlap.

[0006] This application provides a production apparatus for producing electrode assemblies, the electrode assembly including an anode electrode, a cathode electrode, and a separator. The production apparatus includes: an edge-sealing mechanism for sealing the two edges of the separator on both sides of the anode electrode in the width direction; a composite mechanism for compositely bonding the cathode electrode with a layer of the separator on the side opposite to the anode electrode; a first detection mechanism located downstream of the edge-sealing mechanism and used at least to detect the edge-sealing state; and a second detection mechanism located downstream of the composite mechanism and used at least to detect the composite state.

[0007] In the above technical solution, the sealing state and composite state are detected by the first and second detection institutions respectively, which can achieve more comprehensive detection. This avoids the defects being blocked and undetectable after the anode, cathode and separator are stacked to form the electrode assembly, thus improving the detection accuracy and reducing the risk of missing defects during the electrode assembly production process. The anode and cathode electrodes in the produced electrode assembly are less likely to overlap and short-circuit, and the anode electrode is less likely to overlap with the battery cell casing, which would lead to corrosion and leakage.

[0008] In some embodiments, the compounding mechanism is arranged upstream of the edge sealing mechanism, the compounding mechanism is configured to compound the cathode tab and a layer of the separator to form a compounded tab, and the edge sealing mechanism is configured to seal edges of the anode tab, the compounded tab and another layer of the separator to form the unrolled electrode assembly.

[0009] In the above technical solution, the relative positions of the cathode tab and the separator are fixed by compounding, and the cathode tab and the separator can be synchronously transmitted to the edge sealing mechanism without deviation, which is beneficial to improve the position accuracy of the cathode tab during transmission and edge sealing.

[0010] In some embodiments, the first detection mechanism is further configured to detect the relative positions of the anode tab and the cathode tab.

[0011] In the above technical solution, the first detection mechanism detects the relative positions of the anode tab and the cathode tab, so that the relative positions of the anode tab and the cathode tab of the electrode assembly obtained after the compounded tab, the anode tab and another layer of the separator are laminated and the separator is sealed are accurate, for example, the edges of the anode tab on both sides of the width of the anode tab exceed the edges of the cathode tab by a certain distance, which reduces the risk of OH leakage and solves the problem of lithium precipitation.

[0012] In some embodiments, the second detection mechanism is further configured to detect the relative positions of the separator and the cathode tab in the compounded tab.

[0013] In the above technical solution, the second detection mechanism can detect whether the relative positions of the cathode tab and the separator before the separator is sealed are accurate, improve the position accuracy of the separator and the cathode tab, and the edges of the separator on both sides of the width of the separator can exceed the edges of the cathode tab by a certain size, which is beneficial to provide sufficient space for sealing and improve the effect of separating the anode tab and the cathode tab by the separator.

[0014] In some embodiments, the edge sealing mechanism is arranged upstream of the compounding mechanism, the edge sealing mechanism is configured to seal edges of the anode tab and two layers of the separator to form a sealed tab, and the compounding mechanism is configured to attach the cathode tab to one side of the sealed tab and compound the cathode tab to form the unrolled electrode assembly.

[0015] In the above technical solution, the relative positions of the anode tab and the separator are stabilized by sealing, and the anode tab and the separator can be synchronously transmitted to the compounding mechanism without deviation, folding of the separator, exposure of the anode tab and other problems, which is beneficial to improve the position accuracy of the anode tab during transmission and compounding, and reduce the risk of overlapping of the anode tab and the cathode tab.

[0016] In some embodiments, the first detection mechanism is further configured to detect the relative positions of the separator and the anode tab.

[0017] In the technical solution, the first detection mechanism detects the over-hydrogen evolution (OH) of the separator, so as to detect whether the relative position of the composite front anode tab and the separator is accurate, improve the position accuracy of the separator and the anode tab, and make the two sides of the separator in the width direction exceed the edges of the anode tab by a sufficient size, thereby improving the edge sealing effect and reducing the risk of the anode tab and the cathode tab overlapping.

[0018] In some embodiments, the second detection mechanism is further configured to detect the relative position of the anode tab and the cathode tab.

[0019] In the technical solution, after the edge sealing piece and the cathode tab are laminated and compounded, the relative position of the anode tab and the cathode tab of the obtained electrode assembly is accurate, for example, the requirement that the two sides of the anode tab in the width direction exceed the edges of the cathode tab by a certain distance is met, the risk of OH leakage is reduced, and the effect of solving the lithium precipitation problem is better.

[0020] In some embodiments, the production device further comprises: an unwinding mechanism configured to unwind the anode tab, the cathode tab, and the separator; and a winding mechanism configured to wind the unwound electrode assembly, wherein the edge sealing mechanism is arranged between the unwinding mechanism and the winding mechanism, and the compounding mechanism is arranged between the unwinding mechanism and the winding mechanism.

[0021] In the technical solution, the production device can realize unwinding of the tabs and the separator and winding of the electrode assembly, and realize the whole process of electrode assembly production.

[0022] In some embodiments, the production device further comprises: a third detection mechanism arranged on one side of the winding mechanism and configured to detect the relative position of the anode tab and the cathode tab of adjacent two turns of the electrode assembly on the winding mechanism.

[0023] In the technical solution, the third detection mechanism is used to detect the relative position of the anode tab and the cathode tab of adjacent two turns of the electrode assembly after winding and forming, so that the lithium precipitation resistance of the anode tab and the cathode tab of the electrode assembly after winding and forming is better, the risk of OH leakage is further reduced, and the quality of the electrode assembly is improved.

[0024] In some embodiments, the third detection mechanism comprises a third upper detector and a third lower detector, the third upper detector is configured to detect the position of the anode tab of the electrode assembly in front of the winding mechanism, and the third lower detector is configured to detect the position of the cathode tab of the electrode assembly on the winding mechanism; or the third detection mechanism comprises a third upper detector and a third lower detector, the third upper detector is configured to detect the position of the cathode tab of the electrode assembly in front of the winding mechanism, and the third lower detector is configured to detect the position of the anode tab of the electrode assembly on the winding mechanism.

[0025] In the technical solution, the third upper detector and the third lower detector can detect the relative positions of the anode pole piece and the cathode pole piece of any two adjacent turns in the multiple turns of the electrode assembly during the winding process, realize comprehensive detection of the entire wound electrode assembly, and better reduce the OH leakage kill effect.

[0026] In some embodiments, the unwinding mechanism includes a cathode unwinding mechanism for unwinding the cathode pole piece, and the production device further includes a fourth detection mechanism arranged between the cathode unwinding mechanism and the compounding mechanism and used for detecting the state of the cathode pole piece.

[0027] In the technical solution, the fourth detection mechanism can timely find and remove the defective part of the cathode pole piece, thereby improving the quality of the cathode pole piece for the electrode assembly.

[0028] In some embodiments, the production device further includes a first cutting mechanism arranged upstream of the winding mechanism and used for cutting the electrode assembly, a first feeding mechanism arranged between the unwinding mechanism and the compounding mechanism and used for feeding the segmented cathode pole piece unwound by the unwinding mechanism to the compounding mechanism, and a first buffering mechanism arranged downstream of the compounding mechanism and used for buffering the compounded electrode assembly.

[0029] In the technical solution, the first buffering mechanism can still deliver the compounded piece to the edge sealing mechanism during the process in which the first feeding mechanism cuts the cathode pole piece, without reducing the edge sealing rate, so that the first cutting mechanism can cut the strip-shaped electrode assembly without deceleration, improve the winding efficiency, and further improve the overall production capacity.

[0030] In some embodiments, the compounding mechanism is arranged upstream of the edge sealing mechanism, and the second detection mechanism is arranged between the first buffering mechanism and the edge sealing mechanism.

[0031] In the technical solution, the defects generated during the compounding process and the buffering process of the compounded piece can be detected by the second detection mechanism, which is beneficial to improve the quality of the compounded piece for producing the electrode assembly.

[0032] In some embodiments, the compounding mechanism is arranged downstream of the edge sealing mechanism, and the second detection mechanism is arranged between the compounding mechanism and the first buffering mechanism.

[0033] In the technical solution, the edge sealing is performed first, and then the compounding is performed, so that the buffering after the compounding does not easily affect the accuracy of the subsequent process, and therefore the strip-shaped electrode assembly obtained after the compounding can be detected by the second detection mechanism first and then buffered.

[0034] In some embodiments, the production device further comprises a second cutting mechanism arranged between the unwinding mechanism and the edge sealing mechanism, and configured to cut and feed the anode sheet unwound by the unwinding mechanism to the edge sealing mechanism; or the production device further comprises a second feeding mechanism and a second buffer mechanism, the second feeding mechanism is arranged between the unwinding mechanism and the edge sealing mechanism, and configured to feed the anode sheet unwound by the unwinding mechanism to the edge sealing mechanism in segments, and the second buffer mechanism is arranged downstream of the edge sealing mechanism, and configured to buffer the electrode assembly after edge sealing.

[0035] In the above technical solution, the second cutting mechanism can cut the anode sheet without deceleration, thereby reducing the influence on the edge sealing efficiency, and further improving the winding efficiency and the overall production capacity. The second buffer mechanism buffers the material after edge sealing, so that the winding process is not affected by the operation efficiency of the second feeding mechanism, which is conducive to realizing non-deceleration operation of the winding process, such as non-deceleration operation of the first cutting mechanism, and further improving the winding efficiency and the overall production capacity.

[0036] According to the electrode assembly production method, the cathode sheet and one layer of separator are stacked and subjected to a compounding process, the anode sheet is stacked and arranged between the two layers of separator, and the two side edges of the two layers of separator are edge sealed and connected, to obtain an unwound electrode assembly; wherein the compounding state is detected after the compounding process, and the edge sealing state is detected after the edge sealing and connecting.

[0037] In the above technical solution, by dividing into a compounding process and a packaging process, and detecting the edge sealing state and the compounding state respectively, more comprehensive detection can be realized, so that defects are not hidden and cannot be detected after the anode sheet, the cathode sheet and the two layers of separator are stacked to form the electrode assembly, the detection accuracy is improved, the risk of defect leakage in the electrode assembly production process is reduced, the anode sheet and the cathode sheet in the produced electrode assembly are less likely to be short-circuited, and the anode sheet is less likely to be connected with the shell of the battery monomer to cause corrosion and liquid leakage.

[0038] In some embodiments, the cathode sheet and one layer of separator are stacked and subjected to a compounding process to obtain a compound sheet; the compounding state of the compound sheet is detected; the compound sheet, the anode sheet and another layer of separator are stacked, and the two side edges of the two layers of separator are edge sealed and connected, to obtain an unwound electrode assembly, wherein the anode sheet is located between the two layers of separator, and the anode sheet is located on the side of the separator of the compound sheet away from the cathode sheet; and the edge sealing state of the unwound electrode assembly is detected.

[0039] In the above technical solution, the composite sheet fixes the relative positions of the cathode sheet and the separator, and can be synchronously transmitted to the edge sealing process without deviation, which is beneficial to improve the position accuracy of the cathode sheet in the transmission and edge sealing process.

[0040] In some embodiments, the method further comprises: laminating the anode sheet between the two layers of the separator and performing edge sealing treatment on the two layers of the separator to obtain an edge sealing sheet, wherein the anode sheet is located between the two layers of the separator; detecting the edge sealing state of the edge sealing sheet; laminating the edge sealing sheet and the cathode sheet and performing the composite treatment to obtain the unrolled electrode assembly; and detecting the composite state of the unrolled electrode assembly.

[0041] In the above technical solution, the edge sealing sheet stabilizes the relative positions of the anode sheet and the separator, and can be synchronously transmitted to the composite process without deviation, separator folding, anode sheet exposure and other problems, which is beneficial to improve the position accuracy of the anode sheet in the transmission and composite process, and reduce the risk of anode sheet and cathode sheet overlap.

[0042] In some embodiments, the production method further comprises: detecting the state of the cathode sheet after the cathode sheet is unrolled and before the composite treatment or the edge sealing connection.

[0043] In the above technical solution, the defective part of the cathode sheet can be found and removed in time through detection, thereby improving the quality of the cathode sheet used for the electrode assembly.

[0044] In some embodiments, the production method further comprises: winding the unrolled electrode assembly, and detecting the positions of the anode sheet and the cathode sheet before and after winding.

[0045] In the above technical solution, the positions of the anode sheet and the cathode sheet before and after winding are detected to determine the relative positions of the anode sheet and the cathode sheet of adjacent two turns in the electrode assembly after winding and forming, so that the lithium precipitation resistance of the anode sheet and the cathode sheet of the electrode assembly after winding and forming is better, the risk of OH leakage is further reduced, and the quality of the electrode assembly is improved. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a schematic diagram of a battery;

[0047] Figure 2 is a schematic diagram of a battery cell;

[0048] Figure 3Schematic diagram of production equipment provided for some embodiments of this application;

[0049] Figure 4 for Figure 3 A schematic diagram of the testing process conducted by the fourth testing agency in China;

[0050] Figure 5 and Figure 6 for Figure 3 Schematic diagrams of the second detection mechanism in different embodiments;

[0051] Figure 7 and Figure 8 for Figure 3 Schematic diagrams of the first testing agency's testing from different perspectives;

[0052] Figure 9 for Figure 3 A schematic diagram of the testing conducted by a third-party testing agency in China;

[0053] Figure 10 Schematic diagram of production equipment provided for other embodiments of this application;

[0054] Figure 11 and Figure 12 for Figure 10 Schematic diagrams of the first detection mechanism from different perspectives in the first embodiment;

[0055] Figure 13 for Figure 10 A schematic diagram of the first testing mechanism in the second embodiment;

[0056] Figure 14 for Figure 10 A schematic diagram of the testing process conducted by the fourth testing agency in China;

[0057] Figure 15 and Figure 16 for Figure 10 Schematic diagrams of the second testing agency from different perspectives;

[0058] Figure 17 for Figure 10 A schematic diagram of the testing conducted by the third-party testing agency.

[0059] Figure label:

[0060] Battery 300; Battery cell 310; Casing 320;

[0061] Electrode assembly 200; Anode plate 210; Anode tab 211; Cathode plate 220; First active material region 221; Second active material region 222; Cathode tab 223; Diaphragm 230; Composite sheet 240; Sealing sheet 250;

[0062] Production equipment 100;

[0063] Unwinding mechanism 10; cathode unwinding mechanism 11; anode unwinding mechanism 12; diaphragm unwinding mechanism 13;

[0064] Winding mechanism 20; winding needle 21; edge sealing mechanism 30; composite mechanism 40;

[0065] First detection mechanism 51; second detection mechanism 52; third detection mechanism 53; fourth detection mechanism 54;

[0066] First cutting mechanism 61; second cutting mechanism 62;

[0067] First feeding mechanism 71; second feeding mechanism 72;

[0068] First buffer mechanism 81; second buffer mechanism 82;

[0069] Deviation rectifying mechanism 90;

[0070] Thickness direction F1; width direction F2. 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 specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms “include” and “have” in the specification and claims of the present application and their any variants are intended to cover the non-exclusive inclusion. The terms “first”, “second” and the like in the specification and claims of the present application are used to distinguish different objects, and are not intended to describe a specific order or primary and secondary relationship.

[0073] In the present application, the phrase “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 appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0074] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of 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 components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions 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 demand of its market 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 device during the production of the electrode assembly, and the offset between the layers is obtained by a detector at the winding device. The separator is easy to fold during the production process, 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 liquid leakage. Moreover, the electrode sheet detection of the detector is not accurate, and it is easy to miss the defects such as OH missing kill, electrode sheet folding and bruising.

[0080] Based on this, the application provides a production device, which comprises an edge sealing mechanism, a composite mechanism, a first detection mechanism and a second detection mechanism. The edge sealing mechanism is used to connect the two sides of the separator in the width direction on both sides of the anode pole piece in the thickness direction, so that the two layers of separators wrap the anode pole piece and are connected to each other. The composite mechanism is used to composite and paste the cathode pole piece on the side of the separator away from the anode pole piece.

[0081] In the above embodiment, even if the separator is folded during production, the edge sealing connection still wraps the anode pole piece 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, the first detection mechanism and the second detection mechanism detect the edge sealing defects and the composite state respectively, improve the connection effect of the pole piece and the separator after each process, thereby improving the detection accuracy and reducing the risk of missing defects such as OH leakage, pole piece folding and bruising.

[0082] The production device of the embodiment of the application is used to produce an electrode assembly, which can be used in a battery monomer, and the battery monomer can be used in a battery. The electrical equipment can use the battery monomer or the battery in any of the following embodiments. Specifically, the electrical equipment can use the battery or the battery monomer as a power supply, and the electrical equipment can be but not limited to a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0083] The following embodiments are described by taking the electrical equipment as a vehicle for convenience of description.

[0084] Reference Figures 1-2 The inside of the vehicle is provided with a battery 300, which can be arranged at the bottom, head or 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 the operating power supply of the vehicle. The vehicle can also include a controller and a motor, and the controller is used to control the battery 300 to supply power to the motor, for example, for 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 the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0086] In the embodiment of the application, as Figure 1As shown, battery 300 refers to a single physical module comprising one or more battery cells 310 to provide higher voltage and capacity. For example, battery 300 mentioned in this application may include battery modules or battery packs. Some batteries 300 may include a housing for encapsulating one or more battery cells 310 or multiple battery modules. The housing can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 310. Of course, some batteries 300 may not include the aforementioned housing and may be directly installed in the battery 300 mounting compartment of the electrical device.

[0087] In this application, the battery cell 310 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to this. The battery cell 310 may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to this. The battery cell 310 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to this.

[0088] For example, such as Figure 2 As shown, the battery cell 310 may include a housing 320, an electrode assembly 200, and an electrolyte. The housing 320 is used to contain the electrode assembly 200 and the electrolyte. The housing 320 of the battery cell 310 may contain one or more electrode assemblies 200. The electrode assembly 200 is the component in the battery cell 310 where the electrochemical reaction takes place. The electrode assembly 200 includes multiple layers of materials arranged in a stacked manner, specifically including a cathode electrode 220, an anode electrode 210, and a separator 230. The battery cell 310 mainly relies on the movement of metal ions between the cathode electrode 220 and the anode electrode 210 to operate.

[0089] The cathode electrode 220 includes a cathode current collector and a cathode active material layer. 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 coated on it. The cathode current collector without the cathode active material layer serves as the cathode tab 223. Taking a lithium-ion battery as an example, the cathode current collector can be made of aluminum, and the cathode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, 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 is protruded from the anode current collector with the anode active material layer, and serves as the anode tab 211. The material of the anode current collector can be copper, and the anode active material can be carbon or silicon, etc. In order to ensure that no fusing occurs when passing a large current, the number of cathode tabs 223 is multiple and stacked together, and the number of anode tabs 211 is multiple and stacked together. In the description of the present application, the width, relative position, etc. of the tab (anode tab 210 and cathode tab 220) are described with respect to the tab film area, and the tabs are not included.

[0091] The material of the separator 230 can be PP (polypropylene) or PE (polyethylene), etc. The cathode tab 220 and the anode tab 210 are stacked along the thickness direction F1, and the separator 230 separates the cathode tab 220 and the anode tab 210 and is stacked along the thickness direction F1 of the tab. The separator 230, 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 and the separator 230 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 production equipment 100 for producing an electrode assembly 200 according to an embodiment of the present application is described.

[0094] Please refer to Figure 3 and Figure 10 , Figure 3 and Figure 10 are schematic diagrams of the production equipment 100 of different embodiments. The production equipment 100 includes an edge sealing mechanism 30, a compounding mechanism 40, a first detection mechanism 51 and a second detection mechanism 52.

[0095] The edge sealing mechanism 30 is used to seal and connect the two side edges of the separator 230 in the width direction F2 on both sides of the anode tab 210. The compounding mechanism 40 is used to compound the cathode tab 220 with one side of the separator 230 away from the anode tab 210. The first detection mechanism 51 is arranged downstream of the edge sealing mechanism 30 and is used to detect at least the sealing state. The second detection mechanism 52 is arranged downstream of the compounding mechanism 40 and is used to detect at least the compounding state.

[0096] For the electrode assembly 200, the material conveying direction of the anode tab 210, the cathode tab 220 and the separator 230 refers to the running direction of each material in the production process, i.e. the length direction of each material of the electrode assembly 200; the thickness direction F1 of the anode tab 210, the cathode tab 220 and the separator 230 refers to the direction with the smallest material size, i.e. the stacking direction of each material in the electrode assembly 200; and the width direction F2 of the anode tab 210, the cathode tab 220 and the separator 230 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 separators 230 on both sides of the anode tab 210, i.e. the two separators 230 located on both sides of the thickness direction F1 of the anode tab 210. The two side edges of the width direction F2 of the separator 230, i.e. the part of the separator 230 beyond the edge of the anode tab 210 in the width direction F2, in other words, the width of the separator 230 is greater than the width of the anode tab 210, and in the production process, the anode tab 210 is located between the two side edges of the separator 230 in the width direction F2.

[0098] The edge sealing mechanism 30 can seal and connect the part of the two separators 230 beyond the anode tab 210 in the width direction F2, i.e. connect the two separators 230 together, which can be achieved by heating, pressing, pasting and the like. In the related art, the tabs and the separators 230 are tightly attached by the attachment roller before winding, and there is no connection between the materials and the separators 230, but only a contact relationship, which can be separated from each other after the external force is removed, and there is a risk of overlap between the anode tab 210 and the cathode tab 220. In the present application, the edge sealing mechanism 30 can connect the edges of the two separators 230 together to achieve edge sealing, so that the two separators 230 will not separate to expose the anode tab 210 even if the external force is removed, and the anode tab 210 is not easy to fold during the winding process of the electrode assembly 200, and is not easy to be disturbed by cavitation during the liquid injection process, effectively reducing the risk of overlap between the anode tab 210 and the cathode tab 220, and the risk of overlap between the anode tab 210 and the shell 320 of the battery monomer 310, and improving the problem of lithium extraction.

[0099] In some embodiments, the edge sealing mechanism 30 includes two edge sealing rollers arranged oppositely, which can heat the two side edges of the separator 230 and apply a predetermined pressure in the thickness direction F1 to achieve the edge sealing connection of the two separators 230.

[0100] According to actual conditions, the edge sealing of the two separators 230 can be continuously extended in the material conveying direction, or intermittently extended, which is within the protection scope of the present application.

[0101] It should be noted that the material of the anode tab 210 limits the composite connection between the anode tab 210 and the separator 230, and after the composite connection, the anode tab 210 and the separator 230 are still easy to separate from each other, and the effect of reducing the risk of the anode tab 210 overlap cannot be achieved.

[0102] The composite mechanism 40 can composite the cathode tab 220 and the separator 230 away from the anode tab 210, that is, connect the cathode tab 220 and the separator 230 together, for example, by heating, pressing and the like, to reduce the deviation of the cathode tab 220 relative to the separator 230 during winding and use, and to improve the accuracy of the relative position between the materials.

[0103] In some embodiments, the composite mechanism 40 can include two composite rollers arranged oppositely, which can heat and apply a predetermined pressure along the thickness direction F1 to the cathode tab 220 and the separator 230, so as to bond the cathode tab 220 and the separator 230 together, to achieve the composite connection of the cathode tab 220 and the separator 230.

[0104] The detection mechanism (such as the first detection mechanism 51 and the second detection mechanism 52) can adopt photoelectric sensors, X-ray cameras, CCD (charge coupled device) visual sensors, etc., and the types of different detection mechanisms can be the same or different.

[0105] For example, the detection mechanism can include a line array camera or a plane array camera. The line array camera has a narrow image acquisition range but high acquisition accuracy, so as to be arranged on both sides of the material width direction F2 as shown in Figure 5 and Figure 12 to improve the detection accuracy; the plane array camera has a large image acquisition range but low acquisition accuracy, so as to be arranged in the middle of the material width direction F2 as shown in Figure 6 and Figure 13 to reduce the cost.

[0106] For example, the detection mechanism can include a CCD. The CCD can acquire optical images of the materials, so as to achieve detection. Further, the CCD can convert the optical images into digital signals, so as to analyze, process and store the optical images. For example, the detection mechanism can include an X-ray camera. Specifically, the X-ray camera can penetrate the separator 230 to detect the position of the anode tab 210 located in the inner layer. The X-ray camera has high resolution and can penetrate objects for detection, so as to improve the detection accuracy.

[0107] In addition, the detection mechanism can be arranged on one side or both sides of the material thickness direction F1 according to actual needs, for example Figure 4The two sides of the cathode tab 220 in the thickness direction F1 are provided with detection mechanisms to detect the parameters and other information of the active material layer on both sides of the cathode tab 220; for example Figure 7 and Figure 8 As shown, the two sides of the electrode assembly 200 in the thickness direction F1 are provided with detection mechanisms to detect the relative position and other information of the anode tab 210 and the cathode tab 220; for example Figure 5 and Figure 6 As shown, one side of the cathode tab 220 in the thickness direction F1 is provided with a detection mechanism to detect the self-defects of the cathode tab 220. The detection mechanism can detect multiple parts of the material in the length direction in turn during the movement of the material, or continuously detect the material in the length direction.

[0108] The first detection mechanism 51 is arranged downstream of the edge sealing mechanism 30, so that the anode tab 210 and the separator 230 can be conveyed to the first detection mechanism 51 after being edge sealed, to detect the state of the formed edge seal by the first detection mechanism 51. For example, the edge seal defects such as tab corner, separator 230 wrinkling, edge seal failure, edge seal misplacement, edge seal size, and gray scale difference can be detected. For example, the width and position of the edge seal in the width direction F2 of the separator 230 can be detected, so as to adjust the separator 230 and the edge sealing mechanism 30 according to the detection result, so that the width of the formed edge seal is 0.5mm-1mm, and the edge seal is generally located in the middle of the part of the separator 230 that exceeds the edge of the anode tab 210. Thus, the reliability of the edge seal is improved, and the separator 230 can reliably limit and protect the anode tab 210.

[0109] The second detection mechanism 52 is arranged downstream of the compounding mechanism 40, so that the cathode tab 220 and the separator 230 can be conveyed to the second detection mechanism 52 after being compounded, to detect the compounding state by the second detection mechanism 52. For example, the compounding defects such as cathode tab 220 corner and damage can be detected.

[0110] In this way, the production equipment 100 according to the embodiments of the present application can realize more comprehensive detection by detecting the edge seal state and the compounding state by the first detection mechanism 51 and the second detection mechanism 52 respectively, avoid the defects being blocked and unable to be detected after the anode tab 210, the cathode tab 220 and the two layers of separators 230 are stacked to form the electrode assembly 200, improve the detection accuracy, thereby reducing the risk of defect missed killing in the production process of the electrode assembly 200, and the anode tab 210 and the cathode tab 220 in the produced electrode assembly 200 are not easy to be short-circuited, and the anode tab 210 is not easy to be connected with the shell 320 of the battery monomer 310 to cause corrosion and liquid leakage.

[0111] In the embodiments of the present application, the relative positions of the laminating mechanism 40 and the edge sealing mechanism 30 can be flexibly set. The laminating mechanism 40 can be arranged upstream of the edge sealing mechanism 30, or the edge sealing mechanism 30 can be arranged upstream of the laminating mechanism 40.

[0112] In some embodiments of the present application, as shown in Figure 3 , the laminating mechanism 40 is arranged upstream of the edge sealing mechanism 30. The laminating mechanism 40 is used to laminate the cathode tab 220 and a layer of the separator 230 to form a laminated sheet 240. After the laminated sheet 240 is conveyed to the edge sealing mechanism 30, the edge sealing mechanism 30 is used to seal the anode tab 210, the laminated sheet 240, and another layer of the separator 230 to form the unrolled electrode assembly 200.

[0113] The laminated sheet 240 refers to a sheet body obtained by laminating the cathode tab 220 and the separator 230 through the laminating mechanism 40. The relative positions of the cathode tab 220 and the separator 230 are fixed, and the cathode tab 220 and the separator 230 can be synchronously conveyed to the edge sealing mechanism 30 without being easily deviated, which is beneficial to improve the position accuracy of the cathode tab 220 in the conveying and sealing processes.

[0114] In some embodiments, as shown in Figure 3 and Figures 5-6 , the first detection mechanism 50 is used to detect the relative positions of the cathode tab 220 and the separator 230 in the laminated sheet 240. In other words, the first detection mechanism 50 can detect whether the separator 230 is overlapped with the active material region of the cathode tab 220 in the width direction F2. Figure 5 Figure 6 As shown in Figure 3 , the second detection mechanism 52 is used to detect the relative positions of the cathode tab 220 and the separator 230 in the laminated sheet 240. In other words, the second detection mechanism 52 can detect whether the separator 230 is overlapped with the cathode tab 220 in the width direction F2.

[0115] Therefore, the second detection mechanism 52 can detect whether the relative positions of the cathode tab 220 and the separator 230 before the edge sealing of the separator 230 are accurate, thereby improving the position accuracy of the separator 230 and the cathode tab 220. The two sides of the separator 230 in the width direction F2 can be overlapped with the edges of the cathode tab 220 by a sufficient size, which is beneficial to provide sufficient space for the edge sealing and improve the effect of the separator 230 in separating the anode tab 210 and the cathode tab 220.

[0116] In some embodiments, as shown in Figure 3 and Figures 7-8 , the first detection mechanism 50 is used to detect the relative positions of the cathode tab 220 and the separator 230 in the laminated sheet 240. In other words, the first detection mechanism 50 can detect whether the separator 230 is overlapped with the active material region of the cathode tab 220 in the width direction F2. Figure 7 Figure 8 As shown in Figure 3 ​​The detection schematic diagram of the first detection mechanism 51 under different viewing angles. The first detection mechanism 51 is also used to detect the relative position of the anode tab 210 and the cathode tab 220. After the composite sheet 240, the anode tab 210 and the other layer of the separator 230 are laminated and the edge of the separator 230 is sealed, the relative position of the anode tab 210 and the cathode tab 220 of the obtained electrode assembly 200 is accurate, for example, it meets the requirement that the width of the anode tab 210 exceeds the edge of the cathode tab 220 by a certain distance on both sides, reduces the risk of OH leakage and killing, and the effect of solving the problem of lithium precipitation is better.

[0117] In some specific embodiments in which the compounding mechanism 40 is arranged upstream of the edge sealing mechanism 30, as shown in Figure 7 and Figure 8 The functions of the first detection mechanism 51 and the second detection mechanism 52 include but are not limited to this, for example, the first detection mechanism 51 can also detect the relative position of the anode tab 210 and the separator 230 as needed, further reducing the risk of OH leakage and killing.

[0118] In another embodiment of the present application, as shown in Figure 10 The edge sealing mechanism 30 is arranged upstream of the compounding mechanism 40. The edge sealing mechanism 30 is used to seal the anode tab 210 and the two layers of the separator 230 to form the edge sealed sheet 250. After the edge sealed sheet 250 is conveyed to the compounding mechanism 40, the compounding mechanism 40 can paste the cathode tab 220 on one side of the edge sealed sheet 250 and compound to form the unrolled electrode assembly 200.

[0119] The edge sealed sheet 250 refers to a sheet body formed by wrapping the anode tab 210 with the separator 230 on both sides in the thickness direction F1, so that the relative position of the anode tab 210 and the separator 230 is stable, and the anode tab 210 and the separator 230 can be conveyed synchronously to the compounding mechanism 40 without easy deviation, folding of the separator 230, exposure of the anode tab 210, etc. It is beneficial to improve the position accuracy of the anode tab 210 during conveying and compounding, and reduce the risk of overlapping of the anode tab 210 and the cathode tab 220.

[0120] In some embodiments, as shown in Figures 10-13 , Figure 11 and Figure 12 For Figure 10 The detection schematic diagram of the first detection mechanism 51 under different viewing angles in the first embodiment; Figure 13 For Figure 10 The detection schematic diagram of the first detection mechanism 51 in the second embodiment. The first detection mechanism 51 is also used to detect the relative position of the separator 230 and the anode tab 210. In other words, the first detection mechanism 51 can also detect the OH of the separator 230 over the anode tab 210, that is, the size of the edge of the separator 230 exceeding the edge of the active material area of the anode tab 210 in the width direction.

[0121] Therefore, the first detection mechanism 51 can detect whether the relative position of the composite front anode tab 210 and the separator 230 is accurate, improve the position accuracy of the separator 230 and the anode tab 210, and make the two sides of the separator 230 in the width direction F2 exceed the edges of the anode tab 210 by a sufficient size, thereby improving the edge sealing effect and reducing the risk of overlap between the anode tab 210 and the cathode tab 220.

[0122] In some embodiments, as shown in Figure 10 and Figures 15-16 , the second detection mechanism 52 is also used to detect the relative position of the anode tab 210 and the cathode tab 220. After the edge sealing piece 250 and the cathode tab 220 are laminated and compounded, the relative position of the anode tab 210 and the cathode tab 220 of the obtained electrode assembly 200 is accurate, for example, meeting the requirement that the two sides of the anode tab 210 in the width direction exceed the edges of the cathode tab 220 by a certain distance, thereby reducing the risk of OH leakage and killing and better solving the problem of lithium precipitation.

[0123] According to some embodiments of the present application, as shown in Figure 3 and Figure 10 , the production equipment 100 further comprises a unwinding mechanism 10 and a winding mechanism 20. The unwinding mechanism 10 is used to unwind the anode tab 210, the cathode tab 220 and the separator 230, and the winding mechanism 20 is used to wind the unwound electrode assembly 200. The edge sealing mechanism 30 is arranged between the unwinding mechanism 10 and the winding mechanism 20, and the composite mechanism 40 is arranged between the unwinding mechanism 10 and the winding mechanism 20.

[0124] The unwinding mechanism 10 is a device for releasing the material in a wound state in a belt shape. The unwinding mechanism 10 can include an unwinding shaft capable of carrying the material in a wound state and capable of releasing the material in a belt shape. The unwinding shaft can include a shaft, a drum, a roller or other suitable components for winding the belt-shaped material, and the specific design and features of the unwinding shaft can be set according to the width and thickness of the belt-shaped material. Among them, the material can be pre-wound and directly placed on the unwinding shaft, or it can be 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.

[0125] For example Figure 3 and Figure 10As shown, the unwinding mechanism 10 can include a cathode unwinding mechanism 11, an anode unwinding mechanism 12, and a diaphragm unwinding mechanism 13, the cathode unwinding mechanism 11 is used to carry and release the cathode electrode sheet 220, the anode unwinding mechanism 12 is used to carry and release the anode electrode sheet 210, and the diaphragm unwinding mechanism 13 is used to carry and release the diaphragm 230. The number of cathode unwinding mechanism 11, anode unwinding mechanism 12 and diaphragm unwinding mechanism 13 can be one or more, and multiple unwinding mechanisms 10 can be used alternately to realize continuous unwinding operation and improve production efficiency.

[0126] The winding mechanism 20 is a device for winding the composite, edge-sealed and obtained 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 20 can include a winding needle 21, which can wind the strip-shaped electrode assembly 200 by rotating. The rotation of the winding needle 21 can be driven by a motor, a hydraulic system or a pneumatic system, etc. The rotation of the winding needle 21 can make the strip-shaped electrode assembly 200 wind around the winding needle 21 to form a specific shape of the electrode assembly 200. The shape of the winding needle 21 can be a regular shape such as a cylindrical shape, a conical shape, etc., or an irregular shape. According to the different shapes of the winding needle 21, the wound electrode assembly 200 can present different shapes.

[0127] The edge sealing mechanism 30 and the composite mechanism 40 are arranged between the unwinding mechanism 10 and the winding mechanism 20, which means that in the conveying direction, the edge sealing mechanism 30 and the composite mechanism 40 are arranged between the unwinding mechanism 10 and the winding mechanism 20, so that the anode electrode sheet 210, the cathode electrode sheet 220 and the diaphragm 230 released by the unwinding mechanism 10 can be edge sealed and composited to obtain the strip-shaped unwound electrode assembly 200. However, in terms of spatial position, the relative positions of the unwinding mechanism 10, the edge sealing mechanism 30, the composite mechanism 40 and the winding mechanism 20 can be flexibly arranged, for example Figure 10 As shown, in the embodiment in which the edge sealing mechanism 30 is arranged upstream of the composite mechanism 40, the diaphragm unwinding mechanism 13, the anode unwinding mechanism 12 and the edge sealing mechanism 30 are arranged adjacent to each other, the cathode unwinding mechanism 11 and the composite mechanism 40 are arranged adjacent to each other, and the winding mechanism 20 and the composite mechanism 40 are arranged adjacent to each other. Figure 3 As shown, in the embodiment in which the composite mechanism 40 is arranged upstream of the edge sealing mechanism 30, one diaphragm unwinding mechanism 13, the cathode unwinding mechanism 11 and the composite mechanism 40 are arranged adjacent to each other, the other diaphragm unwinding mechanism 13, the anode unwinding mechanism 12 and the edge sealing mechanism 30 are arranged adjacent to each other, and the winding mechanism 20 and the edge sealing mechanism 30 are arranged adjacent to each other.

[0128] In some embodiments of the present application, as shown in Figure 3 、 Figure 9 、 Figure 10 and Figure 17 shown,Figure 9 For Figure 3 The detection schematic diagram of the third detection mechanism 53, Figure 17 For Figure 10 The detection schematic diagram of the third detection mechanism 53. The production equipment 100 further comprises: a third detection mechanism 53, which is arranged on one side of the winding mechanism 20 and is used for detecting the relative positions of the anode pole piece 210 and the cathode pole piece 220 of the adjacent two turns of the electrode assembly 200 on the winding mechanism 20.

[0129] By detecting the relative positions of the anode pole piece 210 and the cathode pole piece 220 of the adjacent two turns of the electrode assembly 200 after winding and forming through the third detection mechanism 53, the lithium precipitation resistance of the anode pole piece 210 and the cathode pole piece 220 of the electrode assembly 200 after winding and forming is better, the risk of OH leakage is further reduced, and the quality of the electrode assembly 200 is improved.

[0130] In some embodiments, as shown in Figure 9 and Figure 17 The third detection mechanism 53 comprises a third upper detector and a third lower detector, the third upper detector is used for detecting the pole piece position of the electrode assembly 200 in front of the winding mechanism 20, and the third lower detector is used for detecting the pole piece position of the electrode assembly 200 on the winding mechanism 20.

[0131] Wherein, the electrode assembly 200 in front of the winding mechanism 20 refers to the part about to be wound onto the winding mechanism 20, that is, the electrode assembly 200 of the outer turn of the adjacent two turns of the electrode assembly 200; the electrode assembly 200 on the winding mechanism 20 refers to the part just wound onto the winding mechanism 20, that is, the electrode assembly 200 of the inner turn of the adjacent two turns of the electrode assembly 200. Therefore, the third upper detector and the third lower detector can detect the relative positions of the anode pole piece 210 and the cathode pole piece 220 of any adjacent two turns of the multiple turns of the electrode assembly 200 during winding, realize comprehensive detection of the entire winding and forming of the electrode assembly 200, and the effect of reducing OH leakage is better.

[0132] Here, the up and down of the "third upper detector" and the "third lower detector" are not limited to the relative positions of the two detectors high and low, but only represent that the two detectors are used for detecting different positions.

[0133] Specifically, the third upper detector and the third lower detector detect the corresponding relationship of the anode pole piece 210 and the cathode pole piece 220, which can be flexibly set according to the stacking order of the anode pole piece 210 and the cathode pole piece 220 in the electrode assembly 200.

[0134] For example Figure 7 and Figure 9As shown, in each turn of the electrode assembly 200, from the outside to the inside along the radial direction of the winding mechanism 20, there are cathode electrode 220, diaphragm 230, anode electrode 210, and diaphragm 230. At this time, the anode electrode 210 of the front electrode assembly 200 of the winding mechanism 20 is easy to detect, and the cathode electrode 220 of the upper electrode assembly 200 of the winding mechanism 20 is easy to detect. Therefore, the third upper detector is used to detect the position of the anode electrode 210 of the front electrode assembly 200 of the winding mechanism 20, and the third lower detector is used to detect the position of the cathode electrode 220 of the upper electrode assembly 200 of the winding mechanism 20, which helps to improve the accuracy of detection.

[0135] For example Figure 15 and Figure 17 As shown, in each turn of the electrode assembly 200, from the outside to the inside along the radial direction of the winding mechanism 20, there are diaphragm 230, anode plate 210, diaphragm 230 and cathode plate 220. At this time, the cathode plate 220 of the front electrode assembly 200 of the winding mechanism 20 is easy to detect and the anode plate 210 of the upper electrode assembly 200 of the winding mechanism 20 is easy to detect. Therefore, the third upper detector is used to detect the position of the cathode plate 220 of the front electrode assembly 200 of the winding mechanism 20, and the third lower detector is used to detect the position of the anode plate 210 of the upper electrode assembly 200 of the winding mechanism 20, which helps to improve the accuracy of detection.

[0136] In some embodiments, such as Figure 3 and Figure 10 As shown, the production equipment 100 may further include a web-correcting mechanism 90, which is located upstream of the winding mechanism 20, for example... Figure 3 As shown, it is located between the edge sealing mechanism 30 and the winding mechanism 20, or as... Figure 10 The shown is located between the composite mechanism 40 and the winding mechanism 20. The correction mechanism 90 is used to correct the transmission position of the strip electrode assembly 200 when the third detection mechanism 53 detects that the anode plate 210 and cathode plate 220 of two adjacent turns of the electrode assembly 200 have shifted, so as to correct the relative position of the two turns of the electrode assembly 200 after winding.

[0137] According to some embodiments of this application, such as Figure 3 and Figure 10 As shown, the unwinding mechanism 10 includes a cathode unwinding mechanism 11 for unwinding the cathode electrode 220. The production equipment 100 also includes a fourth detection mechanism 54, which is located between the cathode unwinding mechanism 11 and the composite mechanism 40, and is used to detect the state of the cathode electrode 220.

[0138] The condition of the cathode electrode 220 includes, but is not limited to, the width of the active material region on both sides of the surface in the thickness direction F1 of the cathode electrode 220, known defective electrodes (such as defective electrodes with yellow labels), and electrode damage. Through inspection by the fourth inspection agency 54, 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.

[0139] For example, please refer to Figure 4 and Figure 14 , Figure 4 for Figure 3 A schematic diagram of the testing conducted by the fourth testing agency in China (age 54). Figure 14 for Figure 10 A schematic diagram of the fourth testing mechanism 54 is shown. The cathode active material layer on the same side of the cathode electrode 220 includes a first active material region 221 and a second active material region 222. The second active material region 222 is located on the side of the first active material region 221 closest to the cathode tab 223. For example, the second active material region 222 can be made of AT11 material, and the first active material region 221 can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. By setting the second active material region 222, burrs are less likely to form on the cathode electrode 220 during the cutting of the cathode tab 223. The fourth testing mechanism 54 can be used to detect whether the width of the second active material region 222 meets the set range (e.g., 3mm to 5mm), so that the cathode electrode 220 has a second active material region 222 of suitable width.

[0140] According to some embodiments of this application, such as Figure 3 and Figure 10 As shown, the production equipment 100 further includes: a first cutting mechanism 61, a first feeding mechanism 71, and a first buffer mechanism 81. The first cutting mechanism 61 is located upstream of the winding mechanism 20 and is used to cut the electrode assembly 200. The first feeding mechanism 71 is located between the unwinding mechanism 10 and the composite mechanism 40 and is used to feed the cathode electrode sheet 220 unwound by the unwinding mechanism 10 to the composite mechanism 40 in segments. The first buffer mechanism 81 is located downstream of the composite mechanism 40 and is used to buffer the composited electrode assembly 200.

[0141] The cutting mechanism, such as the first cutting mechanism 61, may include components such as a cutting roller and a cutting blade; it only needs to be able to cut the electrode assembly 200. The feeding mechanism, such as the first feeding mechanism 71, can cut the cathode electrode 220 and then feed it segmentally to the composite mechanism 40, or it can feed the segmented cathode electrode 220 to the composite mechanism 40 in segments via inserting. For example, the feeding mechanism may include components such as a feeding roller and a cutting blade. The buffer mechanism, such as the first buffer mechanism 81, can store the composite sheet 240 that has been composited by the composite mechanism 40 through methods such as winding or stacking.

[0142] In the production process, the material is buffered by the first buffering mechanism 81 and can be continuously conveyed downstream, so that the first cutting mechanism 61 can cut without deceleration, and is not affected by the operation at the first feeding mechanism 71 upstream of the first buffering mechanism 81. For example Figure 3 As shown, the first feeding mechanism 71 has high precision requirements for cutting the cathode tab 220, resulting in a slow operation speed. The first buffering mechanism 81 is used to buffer the composite sheet 240 after the cathode tab 220 is compounded with the separator 230. The first cutting mechanism 61 is used to cut the separator 230 of the electrode assembly 200, which has low precision requirements and a fast operation speed. Through buffering by the first buffering mechanism 81, the first buffering mechanism 81 can still deliver the composite sheet 240 to the edge sealing mechanism 30 during the cutting of the cathode tab 220 by the first feeding mechanism 71, without reducing the edge sealing speed. In turn, the first cutting mechanism 61 can cut the strip-shaped electrode assembly 200 without deceleration, improving the winding efficiency and thus the overall production capacity.

[0143] In some embodiments in which the compounding mechanism 40 is located upstream of the edge sealing mechanism 30, as shown in Figure 3 The second detection mechanism 52 is located between the first buffering mechanism 81 and the edge sealing mechanism 30. In other words, the composite sheet 240 obtained by compounding by the compounding mechanism 40 is first buffered to the first buffering mechanism 81, and the second detection mechanism 52 detects the composite sheet 240 released by the first buffering mechanism 81. Thus, defects generated during compounding and buffering can be detected by the second detection mechanism 52, which is beneficial to improving the quality of the composite sheet 240 used to produce the electrode assembly 200.

[0144] In some embodiments in which the compounding mechanism 40 is located downstream of the edge sealing mechanism 30, as shown in Figure 10 The second detection mechanism 52 is located between the compounding mechanism 40 and the first buffering mechanism 81. Sealing first and then compounding makes it difficult for the buffering after compounding to affect the accuracy of subsequent processes, so the strip-shaped electrode assembly 200 obtained after compounding can be detected by the second detection mechanism 52 before being buffered. In some specific embodiments, the electrode assembly 200 released by the first buffering mechanism 81 can also be detected by the third detection mechanism 53 during winding, so that detection is performed before and after the first buffering mechanism 81, which is beneficial to improving detection accuracy.

[0145] According to some embodiments of the present application, as shown in Figure 3 The production device 100 further includes a second cutting mechanism 62. The second cutting mechanism 62 is located between the unwinding mechanism 10 and the edge sealing mechanism 30, and is used to cut and feed the anode tab 210 unwound by the unwinding mechanism 10 to the edge sealing mechanism 30. The second cutting mechanism 62 can cut the anode tab 210 without deceleration to reduce the impact on the edge sealing efficiency, thereby improving the winding efficiency and the overall production capacity.

[0146] According to some embodiments of the present application, as shown in Figure 10 The production device 100 further comprises a second feeding mechanism 72 and a second buffer mechanism 82. The second feeding mechanism 72 is arranged between the unwinding mechanism 10 and the edge sealing mechanism 30, and is configured to feed the anode sheet 210 unwound by the unwinding mechanism 10 to the edge sealing mechanism 30 in segments. The second buffer mechanism 82 is arranged downstream of the edge sealing mechanism 30, and is configured to buffer the electrode assembly 200 after edge sealing.

[0147] The second feeding mechanism 72 can cut the anode sheet 210, or feed the anode sheet 210 to the edge sealing mechanism 30 in segments by means of a patch feeding mode. The second buffer mechanism 82 buffers the material after edge sealing, such as the strip-shaped electrode assembly 200 or the edge sealing sheet 250, so that the winding process is not affected by the operation efficiency of the second feeding mechanism 72, which is conducive to realizing non-deceleration operation of the winding process, such as realizing non-deceleration operation of the first cutting mechanism 61, and is more conducive to improving the winding efficiency and improving the overall production capacity.

[0148] The present application also provides a production method of a motor assembly. The production method of the electrode assembly according to the embodiments of the present application can use the production device 100 according to the embodiments of the present application, or other production devices. All the descriptions of the production device 100 above can be introduced into the production method of the electrode assembly according to the embodiments of the present application.

[0149] The production method of the electrode assembly according to the embodiments of the present application comprises: laminating the cathode sheet 220 with a layer of the separator 230 and performing a compounding process, laminating the anode sheet 210 between two layers of the separator 230 and performing edge sealing connection on the two side edges of the two layers of the separator 230 to obtain an unwound electrode assembly 200; wherein the compounding state is detected after the compounding process, and the edge sealing state is detected after the edge sealing connection.

[0150] The production method according to the embodiments of the present application will be described below by taking the production device 100 according to the embodiments of the present application as an example. According to the following description, it is understandable to those skilled in the art to produce by using other production devices.

[0151] The edge sealing mechanism 30 can perform edge sealing connection on the two side edges of the separator 230 in the width direction F2 of the anode sheet 210. That is, the two layers of the separator 230 are connected together, for example, the connection of the separator 230 can be realized by heating, pressing, pasting and the like. Through the edge sealing connection, when the external force is removed, the two layers of the separator 230 will not separate to expose the anode sheet 210, and the electrode assembly 200 is not easy to be folded during the winding process, and is not easy to be disturbed by the cavitation during the liquid injection process, thereby effectively reducing the risk of the anode sheet 210 overlapping with the cathode sheet 220 and the anode sheet 210 overlapping with the shell 320 of the battery monomer 310, and improving the problem of lithium extraction.

[0152] The cathode tab 220 can be compounded with one side of the separator 230 facing away from the anode tab 210 by the compounding mechanism 40. That is, the cathode tab 220 and the separator 230 are connected together, for example, by heating, pressing, etc., to reduce the deviation of the cathode tab 220 relative to the separator 230 during winding and use, and to improve the accuracy of the relative positions of the materials.

[0153] The first detection mechanism 51 can be arranged downstream of the edge sealing mechanism 30 and used at least to detect the edge sealing state. For example, the edge sealing defects such as the tab corner, the separator 230 wrinkle, the edge sealing failure, the edge sealing misplacement, the edge sealing size, the gray scale difference, etc. can be detected. For example, the width and position of the edge sealing in the width direction F2 of the separator 230 can be detected, so as to adjust the separator 230 and the edge sealing mechanism 30 according to the detection result, so that the width of the formed edge sealing is 0.5mm-1mm, and the edge sealing is generally in the middle of the part of the separator 230 beyond the edge of the anode tab 210, thereby improving the reliability of the edge sealing, and the separator 230 can reliably limit and protect the anode tab 210.

[0154] The second detection mechanism 52 can be arranged downstream of the compounding mechanism 40 and used at least to detect the compounding state. For example, the compounding defects such as the cathode tab 220 corner, the damage, etc. can be detected.

[0155] In this way, the production method of the electrode assembly 200 according to the embodiments of the present application can realize more comprehensive detection by dividing into the compounding process and the packaging process, and detecting the edge sealing state and the compounding state respectively, avoid the defects being blocked and unable to be detected after the anode tab 210, the cathode tab 220 and the two layers of separators 230 are stacked to form the electrode assembly 200, improve the detection accuracy, thereby reducing the risk of defect missing in the production process of the electrode assembly 200, and the anode tab 210 and the cathode tab 220 in the produced electrode assembly 200 are not easy to be short-circuited, and the anode tab 210 is not easy to be connected with the shell 320 of the battery monomer 310 to cause corrosion and liquid leakage.

[0156] In some embodiments of the present application, in the above production method, the cathode tab 220 is stacked with one layer of separator 230 and subjected to compounding treatment, and the anode tab 210 is arranged between the two layers of separators 230 and the two side edges of the two layers of separators 230 are subjected to edge sealing connection, which can specifically include:

[0157] Stacking the cathode tab 220 with one layer of separator 230 and subjecting to compounding treatment to obtain a compounded sheet 240;

[0158] Detecting the compounding state of the compounded sheet 240;

[0159] The composite sheet 240, the anode electrode sheet 210 and another layer of the separator 230 are laminated and the two side edges of the two layers of the separator 230 are edge-sealed to obtain the unrolled electrode assembly 200, in which the anode electrode sheet 210 is located between the two layers of the separator 230, and the anode electrode sheet 210 is located on the side of the composite sheet 240 away from the cathode electrode sheet 220;

[0160] The edge-sealing state of the unrolled electrode assembly 200 is detected.

[0161] For example, the composite mechanism 40 is arranged upstream of the edge-sealing mechanism 30. The composite mechanism 40 is used to composite the cathode electrode sheet 220 and one layer of the separator 230 to obtain the composite sheet 240, and the edge-sealing mechanism 30 is used to edge-seal the anode electrode sheet 210, the composite sheet 240 and another layer of the separator 230 to obtain the unrolled electrode assembly 200 after the composite sheet 240 is conveyed to the edge-sealing mechanism 30.

[0162] The composite sheet 240 refers to a sheet body obtained by laminating and compositing the cathode electrode sheet 220 and the separator 230, so that the relative positions of the cathode electrode sheet 220 and the separator 230 are fixed and the cathode electrode sheet 220 and the separator 230 can be synchronously conveyed to the edge-sealing process without being easily deviated, which is beneficial to improving the position accuracy of the cathode electrode sheet 220 in the conveying and edge-sealing processes.

[0163] In some embodiments of the present application, in the above production method, the cathode electrode sheet 220 and one layer of the separator 230 are laminated and subjected to the composite process, the anode electrode sheet 210 is arranged between the two layers of the separator 230 and the two side edges of the two layers of the separator 230 are edge-sealed, and specifically can include the following steps.

[0164] The anode electrode sheet 210 and the two layers of the separator 230 are laminated and subjected to the edge-sealing process to obtain the edge-sealed sheet 250, in which the anode electrode sheet 210 is located between the two layers of the separator 230;

[0165] The edge-sealing state of the edge-sealed sheet 250 is detected.

[0166] The edge-sealed sheet 250 and the cathode electrode sheet 220 are laminated and subjected to the composite process to obtain the unrolled electrode assembly 200.

[0167] The composite state of the unrolled electrode assembly 200 is detected.

[0168] For example, the edge-sealing mechanism 30 is arranged upstream of the composite mechanism 40. The edge-sealing mechanism 30 is used to edge-seal the anode electrode sheet 210 and the two layers of the separator 230 to obtain the edge-sealed sheet 250, and the composite mechanism 40 can attach and composite the cathode electrode sheet 220 to one side of the edge-sealed sheet 250 to obtain the unrolled electrode assembly 200 after the edge-sealed sheet 250 is conveyed to the composite mechanism 40.

[0169] The edge sealing piece 250 refers to a piece formed by the anode pole piece 210 being wrapped by the separators 230 on both sides in the thickness direction F1, so that the relative positions of the anode pole piece 210 and the separators 230 are stable, and the anode pole piece 210 and the separators 230 can be synchronously conveyed to the compounding process without being prone to problems such as deviation, folding of the separators 230, and exposure of the anode pole piece 210, which is conducive to improving the position accuracy of the anode pole piece 210 during conveying and compounding, and reducing the risk of overlap of the anode pole piece 210 and the cathode pole piece 220.

[0170] In some embodiments, the production method further comprises: detecting the state of the cathode pole piece 220 before the compounding process or the edge sealing connection, and after the cathode pole piece 220 is unwound.

[0171] The state of the cathode pole piece 220 includes but is not limited to the width of the active material area on the surfaces on both sides of the cathode pole piece 220 in the thickness direction F1, known defective pole pieces (such as pole pieces with yellow labels), pole piece breakage, and the like. For example, a fourth detection mechanism 54 can be arranged between the cathode unwinding mechanism 11 and the compounding mechanism 40, and the fourth detection mechanism is used to detect the state of the cathode pole piece 220.

[0172] By detection, defective parts of the cathode pole piece 220 can be found and removed in time, thereby improving the quality of the cathode pole piece 220 used for the electrode assembly 200.

[0173] In some embodiments, the production method further comprises: winding the unwound electrode assembly 200, and detecting the positions of the anode pole piece 210 and the cathode pole piece 220 before and after winding.

[0174] The unwound electrode assembly 200 obtained by compounding and edge sealing can be wound by a winding mechanism 20. The wound electrode assembly 200 can be placed in the housing 320 of the battery monomer 310 for use. By arranging a third detection mechanism 53 on one side of the winding mechanism 20, the third detection mechanism 53 can detect the pole piece positions of the electrode assembly 200 before winding and the pole piece positions of the electrode assembly 200 on the winding mechanism 20, thereby determining the positions of the anode pole piece 210 and the cathode pole piece 220 before and after winding, and further determining the relative positions of the anode pole piece 210 and the cathode pole piece 220 of the adjacent two turns of the electrode assembly 200 on the winding mechanism 20.

[0175] By detecting the positions of the anode pole piece 210 and the cathode pole piece 220 before and after winding, the relative positions of the anode pole piece 210 and the cathode pole piece 220 of the adjacent two turns of the electrode assembly 200 after winding are determined, so that the lithium precipitation resistance of the anode pole piece 210 and the cathode pole piece 220 of the wound electrode assembly 200 is better, the risk of OH leakage is further reduced, and the quality of the electrode assembly 200 is improved.

[0176] The following description, in conjunction with the accompanying drawings, describes a specific embodiment of a production apparatus 100 according to this application.

[0177] like Figures 3-9 As shown, a production equipment 100 according to a specific embodiment of this application includes: an anode unwinding mechanism 12, a cathode unwinding mechanism 11, a diaphragm unwinding mechanism 13, a composite mechanism 40, an edge sealing mechanism 30, a first detection mechanism 51, a second detection mechanism 52, a third detection mechanism 53, a fourth detection mechanism 54, a first feeding mechanism 71, a first buffer mechanism 81, a first cutting mechanism 61, a second cutting mechanism 62, a web guiding mechanism 90, a winding mechanism 20, and conveying rollers disposed between the mechanisms, the conveying rollers being used to convey materials.

[0178] The cathode electrode 220 and a diaphragm 230 are first combined by the composite mechanism 40 to obtain the composite sheet 240. Then, the composite sheet 240, the anode electrode 210 and another diaphragm 230 are sealed by the sealing mechanism 30 to obtain the unwound electrode assembly 200. Finally, the electrode assembly 200 is wound by the winding mechanism 20.

[0179] Among them, such as Figure 3 and Figure 4 As shown, the fourth detection mechanism 54 is installed after the cathode unwinding mechanism 11 and before the first feeding mechanism 71, and is used to detect the width of the second active material area 222 on both sides of the cathode electrode 220, the presence of yellow-labeled defective products, and electrode damage. Figure 3 and Figure 5 As shown, the second detection mechanism 52 is installed after the first buffer mechanism 81 and before the sealing mechanism 30, and is used to detect the composite state of the composite sheet 240, such as the diaphragm 230, the supercathode 220OH, the folding angle of the cathode 220, and electrode damage. Figure 3 and Figures 7-8 As shown, the first detection mechanism 51 is installed after the sealing mechanism 30 and before the correction mechanism 90. It is used to detect the sealing status of the anode electrode 210 enclosing the cathode electrode 220 on both sides (i.e., the dimension by which the two sides of the active material area of ​​the anode electrode 210 extend beyond the two sides of the active material area of ​​the cathode electrode 220 in the width direction), electrode angles, wrinkles in the diaphragm 230, etc. Figure 3 and Figure 9 As shown, the third detection mechanism 53 is installed after the first cutting mechanism 61 without deceleration and before the winding needle 21. It is used to detect the double-sided OH between the anode plate 210 and the cathode plate 220 between two adjacent electrode assemblies 200 to avoid OH leakage.

[0180] In the above embodiments, comprehensive inspection of the electrode assembly 200 produced by the composite edge sealing and winding method can be achieved, avoiding the omission of composite edge sealing defects such as missed detection of electrode OH, head wrinkling, and electrode crushing.

[0181] likeFigures 10-17 As shown, a production equipment 100 according to another specific embodiment of this application includes: an anode unwinding mechanism 12, a cathode unwinding mechanism 11, a diaphragm unwinding mechanism 13, a composite mechanism 40, an edge sealing mechanism 30, a first detection mechanism 51, a second detection mechanism 52, a third detection mechanism 53, a fourth detection mechanism 54, a first feeding mechanism 71, a second feeding mechanism 72, a first buffer mechanism 81, a second buffer mechanism 82, a first cutting mechanism 61, a web guiding mechanism 90, a winding mechanism 20, and a conveying roller disposed between the various mechanisms, the conveying roller being used to convey materials.

[0182] Two layers of diaphragm 230 are compositely wrapped around the anode electrode 210, and the portion of the diaphragm 230 extending beyond the anode electrode 210 is sealed to obtain a sealing sheet 250. The sealing sheet 250 is then combined with the cathode electrode 220 and wound into an electrode assembly 200.

[0183] Among them, such as Figures 10-12 As shown, the first detection mechanism 51 is installed after the sealing mechanism 30 and before the second buffer mechanism 82, and is used to detect the sealing status of the diaphragm 230 encapsulating the anode electrode 210OH, the sealing effect, and wrinkles in the electrode diaphragm 230. Figure 10 and Figure 14 As shown, the fourth detection mechanism 54 is installed after the cathode unwinding mechanism 11 and before the first feeding mechanism 71, and is used to detect the width of the second active material area 222 on both sides of the cathode electrode 220, the presence of yellow-labeled defective products, and electrode damage. Figure 10 and Figures 15-16 As shown, the second detection mechanism 52 is installed after the composite mechanism 40 and before the first buffer mechanism 81, and is used to detect the state of the anode electrode 210 surrounding the cathode electrode 220, the double-sided OH marks, electrode folds, and wrinkles in the separator 230 within the battery 300 assembly. Figure 10 and Figure 17 As shown, the third detection mechanism 53 is installed after the first cutting mechanism 61 and before the winding needle 21. It is used to detect the double-sided OH between the anode plate 210 and the cathode plate 220 between two adjacent electrode assemblies 200 to avoid OH leakage.

[0184] In the above embodiments, comprehensive inspection of the electrode assembly 200 produced by the edge-sealing composite winding method can be achieved, avoiding the omission of composite edge-sealing defects such as missed detection of electrode OH, head wrinkling, and electrode crushing.

[0185] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0186] The above merely provides preferred embodiments 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 modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A production apparatus characterized by comprising: The application discloses a production equipment for producing an electrode assembly, the electrode assembly comprising an anode pole piece, a cathode pole piece and a separator, the production equipment comprising: an edge sealing mechanism for edge sealing two side edges of the separator on both sides of the anode pole piece in a width direction of the separator; a composite mechanism for compositing the cathode pole piece with one side of the separator away from the anode pole piece; a first detection mechanism arranged downstream of the edge sealing mechanism and used for detecting at least an edge sealing state; a second detection mechanism arranged downstream of the composite mechanism and used for detecting at least a composite state.

2. The production apparatus according to claim 1, wherein The composite mechanism is arranged upstream of the edge sealing mechanism, the composite mechanism is used for compositing the cathode pole piece and one layer of the separator to form a composite piece, and the edge sealing mechanism is used for edge sealing the anode pole piece, the composite piece and another layer of the separator to form an unwound electrode assembly.

3. The production apparatus according to claim 2, wherein The first detection mechanism is also used for detecting a relative position of the anode pole piece and the cathode pole piece.

4. The production apparatus according to claim 2, wherein The second detection mechanism is also used for detecting a relative position of the separator and the cathode pole piece in the composite piece.

5. The production apparatus according to claim 1, wherein The edge sealing mechanism is arranged upstream of the composite mechanism, the edge sealing mechanism is used for edge sealing the anode pole piece and two layers of the separator to form an edge sealing piece, and the composite mechanism is used for pasting and compositing the cathode pole piece on one side of the edge sealing piece to form an unwound electrode assembly.

6. The production apparatus according to claim 5, wherein The first detection mechanism is also used for detecting a relative position of the separator and the anode pole piece.

7. The production apparatus according to claim 5, wherein The second detection mechanism is also used for detecting a relative position of the anode pole piece and the cathode pole piece.

8. The production apparatus according to any one of claims 1 to 7, wherein Further comprising: an unwinding mechanism for unwinding an anode pole piece, a cathode pole piece and a separator; a winding mechanism for winding an unwound electrode assembly, the edge sealing mechanism is arranged between the unwinding mechanism and the winding mechanism, and the composite mechanism is arranged between the unwinding mechanism and the winding mechanism.

9. The production apparatus according to claim 8, wherein Further comprising: a third detection mechanism arranged on one side of the winding mechanism and used for detecting a relative position of the anode pole piece and the cathode pole piece of two adjacent electrode assemblies on the winding mechanism.

10. The production equipment according to claim 9, wherein the third detection mechanism comprises a third upper detector and a third lower detector, the third upper detector is used for detecting a position of the anode pole piece of the electrode assembly in front of the winding mechanism, and the third lower detector is used for detecting a position of the cathode pole piece of the electrode assembly on the winding mechanism; or the third detection mechanism comprises a third upper detector and a third lower detector, the third upper detector is used for detecting a position of the cathode pole piece of the electrode assembly in front of the winding mechanism, and the third lower detector is used for detecting a position of the anode pole piece of the electrode assembly on the winding mechanism.

11. The production apparatus according to claim 8, wherein The unwinding mechanism comprises a cathode unwinding mechanism for unwinding the cathode pole piece, and the production equipment further comprises: A fourth detection mechanism is arranged between the cathode unwinding mechanism and the compounding mechanism, and is used for detecting the state of the cathode sheet.

12. The production apparatus according to claim 8, wherein Further comprising: A first cutting mechanism is arranged upstream of the winding mechanism, and is used for cutting the electrode assembly; A first feeding mechanism is arranged between the unwinding mechanism and the compounding mechanism, and is used for feeding the cathode sheet unwound by the unwinding mechanism to the compounding mechanism in segments; A first buffer mechanism is arranged downstream of the compounding mechanism, and is used for buffering the compounded electrode assembly.

13. The production equipment according to claim 12, wherein: The compounding mechanism is arranged upstream of the edge sealing mechanism, and the second detection mechanism is arranged between the first buffer mechanism and the edge sealing mechanism; or The compounding mechanism is arranged downstream of the edge sealing mechanism, and the second detection mechanism is arranged between the compounding mechanism and the first buffer mechanism.

14. The production equipment according to claim 12, wherein: The production equipment further comprises a second cutting mechanism arranged between the unwinding mechanism and the edge sealing mechanism, and used for cutting and feeding the anode sheet unwound by the unwinding mechanism to the edge sealing mechanism; or The production equipment further comprises a second feeding mechanism arranged between the unwinding mechanism and the edge sealing mechanism, and used for feeding the anode sheet unwound by the unwinding mechanism to the edge sealing mechanism in segments, and a second buffer mechanism arranged downstream of the edge sealing mechanism, and used for buffering the edge-sealed electrode assembly.

15. A method of producing an electrode assembly, characterized by, Comprising: Stacking the cathode sheet and a layer of separator, and performing compounding treatment, stacking the anode sheet between two layers of the separator, and performing edge sealing connection on the two side edges of the two layers of the separator, to obtain an unwound electrode assembly; wherein After the compounding treatment, the compounding state is detected, and after the edge sealing connection, the edge sealing state is detected.

16. The method of producing an electrode assembly according to claim 15, wherein The stacking the cathode sheet and a layer of separator, and performing compounding treatment, stacking the anode sheet between two layers of the separator, and performing edge sealing connection on the two side edges of the two layers of the separator, comprises: Stacking the cathode sheet and a layer of separator, and performing compounding treatment, to obtain a compounded sheet; Detecting the compounding state of the compounded sheet; Stacking the compounded sheet, the anode sheet, and another layer of separator, and performing edge sealing connection on the two side edges of the two layers of the separator, to obtain an unwound electrode assembly, wherein the anode sheet is located between the two layers of the separator, and the anode sheet is located on the side of the separator of the compounded sheet which is away from the cathode sheet; Detecting the edge sealing state of the unwound electrode assembly.

17. The method of producing an electrode assembly according to claim 15, wherein The stacking the cathode sheet and a layer of separator, and performing compounding treatment, stacking the anode sheet between two layers of the separator, and performing edge sealing connection on the two side edges of the two layers of the separator, comprises: Stacking the anode sheet and two layers of separator, and performing edge sealing treatment on the two layers of the separator, to obtain an edge-sealed sheet, wherein the anode sheet is located between the two layers of the separator; detecting a state of the edge-sealing of the edge-sealing sheet; stacking the edge-sealing sheet and the cathode electrode sheet and performing a compounding process to obtain the electrode assembly in an unrolled state; detecting a compounding state of the electrode assembly in the unrolled state.

18. The method of producing an electrode assembly according to claim 15, wherein Further comprising: detecting a state of the cathode electrode sheet before the compounding process or the edge-sealing connection and after the unrolling of the cathode electrode sheet; and / or, performing a winding of the electrode assembly in the unrolled state and detecting positions of the anode electrode sheet and the cathode electrode sheet before and after the winding.

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