Method and apparatus for manufacturing an electrode assembly, a battery cell, a battery, and an electric power consuming apparatus

Abstract

A method and apparatus for manufacturing an electrode assembly, a battery cell, a battery, and an electric power consuming device. The method for manufacturing the electrode assembly specifically includes providing a roll material, which includes a positive electrode plate roll (4000), a separator roll (2000), and a negative electrode plate roll (3000). The separator roll (2000) includes a separator body (231) and an early warning coating (232) on the separator body (231). The separator roll (2000) has a tip (a) and a terminal (b) formed at both ends along its winding direction. The early warning coating (232) and the terminal (b) are separated by a first preset length (L1). The positive electrode plate (234), the separator body (231), and the negative electrode plate (233) are laminated and wound, and during the winding process, it is detected whether the early warning coating (232) is installed on the separator body (231).

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims priority to PCT International Application No. PCT / CN2022 / 099551, filed on June 17, 2022, with the title "Method and Equipment for Manufacturing Electrode Assembly, Battery Cell, Battery and Power - consuming Equipment", the entire content of which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of battery technology, and particularly to a method and equipment for manufacturing an electrode assembly, a battery cell, a battery, and a power - consuming equipment.

Background Art

[0003] Energy conservation and reduction of pollutant emissions are the keys to the sustainable development of the automotive industry. Electric vehicles, due to their energy - saving and environmental protection advantages, have become an important component of the sustainable development of the automotive industry. However, for electric vehicles, battery technology is an important factor related to their development. An electrode assembly (also called a bare cell) is an important component of a battery. In the manufacturing process of the electrode assembly, it is necessary to provide a separator body as an important insulating material.

[0004] After the separator body is manufactured, it is generally wound to form a separator roll, and an insulating connecting member is installed between adjacent separators to integrally connect all the separator bodies. In the subsequent manufacturing process, it is necessary to perform a winding process on the separator body in the separator roll to finally obtain the electrode assembly.

[0005] However, during the winding process, the separator body is likely to be damaged or the connecting member between adjacent separator bodies is likely to be wound into the electrode assembly, thereby reducing the production quality and production efficiency of the electrode assembly.

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of this, the present application provides a method and equipment for manufacturing an electrode assembly, a battery cell, a battery, and an electric power consuming device, which can reduce waste caused by breakage or entanglement of connection members during the manufacturing process of the electrode assembly, and improve the production quality and production efficiency of the electrode assembly.

Means for Solving the Problems

[0007] According to a first aspect, the present application provides a method for manufacturing an electrode assembly, the method comprising: providing a roll material, the roll material including a positive electrode plate roll, a separator roll in any one of the above embodiments, and a negative electrode plate roll, wherein the separator roll includes a separator body and an early warning coating provided on the separator body, the separator roll has a tip and a terminal formed at both ends along its winding direction, and the early warning coating is configured to be separated from the terminal by a first preset length; laminating and winding the positive electrode plate in the positive electrode plate roll, the separator body in the separator roll, and the negative electrode plate in the negative electrode plate roll; detecting whether an early warning coating is provided on the separator body during the winding process.

[0008] In this way, by detecting the early warning coating, an early warning is given in advance to the terminal of the separator body to avoid a situation where the length of the terminal is insufficient and breakage occurs, or a situation where a non-separator body structure connected to the terminal is directly wound inside the electrode assembly.

[0009] In some embodiments, after detecting whether an early warning coating is provided on the separator body, if so, further comprising controlling the positive electrode plate and the negative electrode plate to stop winding, and controlling the winding device to pull the separator roll and continue to wind for a distance greater than the first preset length before stopping winding.

[0010] This avoids the phenomenon that the connecting member is involved in the electrode assembly or the situation that the end of the separator body is cut off, affecting the quality of the electrode assembly.

[0011] In some embodiments, controlling the positive electrode plate and the negative electrode plate to stop winding specifically includes controlling the cutting member to cut the positive electrode plate and controlling the cutting member to cut the negative electrode plate.

[0012] The cutting member is installed at a position close to the winding structure of the winding device, separating the negative electrode plate and the positive electrode plate wound by the winding mechanism from the negative electrode plate roll and the positive electrode plate roll, thereby pre-stopping the winding of the positive electrode plate and the negative electrode plate.

[0013] In some embodiments, it further includes controlling the cutting member to cut the separator body after the separator roll is pulled and continuously wound for a distance greater than or equal to a first preset length and then the winding is stopped.

[0014] When controlling the cutting member to cut the separator body, the connecting member is also cut off from the separator roll, thereby avoiding the connecting member affecting the winding of the next electrode assembly.

[0015] In some embodiments, detecting whether an early warning coating is installed on the separator roll by a detection device specifically includes providing the detection device in the transmission path where the separator body is wound around the winding structure of the winding device, and detecting by the detection device whether there is an early warning coating on the separator body at its facing position.

[0016] All separator bodies are wound around the winding device through this transmission path to form the final electrode assembly. By installing the detection device, it is installed in combination with the early warning coating, thereby identifying the early warning coating.

[0017] In some embodiments, detecting whether there is an early warning coating on the separator body at the facing position by the detecting device specifically includes detecting whether there is a region with a color difference from the separator body on the separator body, and that the RGB values of the color difference range between the separator body and the early warning coating are 1 - 225.

[0018] The range of the RGB values of the color difference between the separator body and the early warning coating is limited to 1 - 225, thereby ensuring that the color difference of the early warning coating can be clearly distinguished from the separator body, and thereby being identified as generating an early warning effect.

[0019] In some embodiments, detecting whether there is an early warning coating on the separator body at the facing position by the detecting device specifically includes detecting whether there is a region with a color difference from the separator body on the separator body, and that the RGB values of the color difference range between the separator body and the early warning coating are 20 - 220, and within this range, ensuring that the color difference of the early warning coating can be clearly distinguished from the separator body.

[0020] In some embodiments, providing a separator roll specifically includes providing a plurality of separator bodies, each separator body having a tip and a tail formed along its own longitudinal direction, connecting the tips and tails of every two separator bodies, and winding the separator bodies along the longitudinal direction to form a separator roll.

[0021] In this way, the position of the end of the separator body where the early warning coating is located is pre-early warned. After the early warning coating is detected, at this time, it indicates that there is still a first preset length at the end of the separator body, thereby pre-judging the position of the end of the separator body early and making corresponding adjustments, thereby avoiding the situation where the length of the end is insufficient and damage occurs during the winding of the separator body or the situation where the non-separator body structure connected to the end is directly wound inside the electrode assembly, and guaranteeing the production quality and winding efficiency of the electrode assembly.

[0022] In some embodiments, each separator body is provided with one early warning coating, and the early warning coating is used to perform position early warning for the end of the separator body where it is located, and avoid the situation where the length of the end of the separator body is insufficient and damage occurs during the process of the electrode assembly being wound at high speed.

[0023] In some embodiments, after providing a plurality of separator bodies, it further includes installing one early warning coating on each separator body. The early warning coating is used to perform position early warning for the end of the separator body where it is located, and avoid the situation where the length of the end of the separator body is insufficient and damage occurs during the process of the electrode assembly being wound at high speed.

[0024] In some embodiments, the head-to-tail connection of two separator bodies further includes connecting the tips and ends of each two separator bodies via a connecting member.

[0025] By installing the connecting member, a plurality of separator bodies can be wound simultaneously on one separator roll. At this time, by installing the early warning coating, the specific position of the connecting member can be known, and during the process of the electrode assembly being wound at high speed, the connecting member between two adjacent separator bodies is wound into the electrode assembly, thereby avoiding the phenomenon of forming a defective electrode assembly and affecting the production quality of the electrode assembly.

[0026] In some embodiments, connecting the tips and ends of each two separator bodies via a connecting member provides one or more of polyethylene terephthalate, epoxy resin, polyurethane, unsaturated polyester resin, phenolic resin, polyacrylic acid resin, polyvinyl chloride resin, polysulfide rubber, silicone rubber, polyurethane rubber, chloroprene rubber, butyl rubber, mixes them to form a bonding adhesive, and further includes adhering the tips and ends of each two separator bodies.

[0027] When it is necessary to wind a plurality of separator bodies onto a separator roll, the bonding adhesive is attached to the connection positions of each two separator bodies to connect and wind the plurality of separator bodies to form a separator roll. When it is necessary to peel the separator body from the separator roll, the early warning coating warns in advance the position of the bonding adhesive, prompts the operator to process the bonding adhesive, and avoids the bonding adhesive being wound inside the electrode assembly along with the separator body, thereby affecting the product yield of the electrode assembly.

[0028] In some embodiments, installing the early warning coating on the surface of the separator body further includes applying the early warning coating by extending along the longitudinal direction of the separator body and applying the early warning coating by extending along the width direction of the separator body.

[0029] By ensuring that the early warning coating has a sufficient size in the width direction and / or the longitudinal direction of the separator body, it is guaranteed that the early warning coating can be detected by external settings.

[0030] In some embodiments, applying the early warning coating on the surface of the separator body further includes applying the early warning coating having a second preset length along the longitudinal direction of the separator body, and the range of the second preset length is 1 mm - 2000 mm.

[0031] In this way, it is ensured that the second preset length of the early warning coating is guaranteed, and the early warning coating can have a sufficient detection distance when passing through an external detection device, thereby ensuring that the early warning coating can be effectively detected.

[0032] In some embodiments, applying the early warning coating on the surface of the separator body further includes applying the early warning coating having a second preset length along the longitudinal direction of the separator body, and the range of the second preset length is 10 mm - 50 mm.

[0033] In some embodiments, applying the early warning coating by extending along the width direction of the separator body further includes applying the early warning coating along the width direction of the separator body until the distance range between both side edges of the early warning coating and both side edges of the separator body becomes 1 mm - 2000 mm. This ensures that the early warning coating can be effectively detected by an external detection device, and at the same time, the mutual influence between the early warning coating and the tab can be avoided.

[0034] In some embodiments, before installing the early warning coating on the separator body, Further including providing an early warning coating, the early warning coating is formed by mixing at least one or more of rubber, polyacrylic acid, polymethacrylic acid, methyl polyacrylate, ethyl polyacrylate, pure acrylic emulsion, polyacrylic acid-styrene copolymer, polyvinylpyrrolidone, styrene butadiene rubber, epoxy resin, neopentyl glycol diacrylate, sodium polyacrylate series, fluorine-containing polyolefin series.

[0035] The fluorine-containing polyolefin-based adhesive includes, but is not limited to, rubber materials produced from polyvinylidene fluoride (PVDF), vinylidene fluoride copolymer, or their modified (such as modified with carboxylic acid, acrylic acid, acrylonitrile, etc.) derivatives.

[0036] In this way, an early warning coating can be quickly formed on the surface of the separator body. In some exemplary embodiments, 5# rubber made of natural rubber with a faster coagulation time and higher adhesion strength may be selected.

[0037] According to a second aspect, the present application further provides manufacturing equipment for manufacturing the electrode assembly in any one of the above embodiments, including a winding device and a detection device. The winding device is used to laminate and wind the positive electrode plate on the positive electrode plate roll, the separator body on the separator roll, and the negative electrode plate on the negative electrode plate roll. The detection device is located in the transmission path of the separator body on the separator roll, and the detection device is configured to detect whether an early warning coating is installed on the separator body.

[0038] According to a third aspect, the present application further provides a battery cell, including a case and an electrode assembly manufactured by the manufacturing method of the electrode assembly in any one of the above embodiments and housed in the case.

[0039] According to a fourth aspect, the present application further provides a battery including the battery cell described in the above embodiment.

[0040] According to a fifth aspect, the present application further provides an electric power consuming device including a battery for supplying electric energy as described in the above embodiments.

[0041] Details of one or more embodiments of the present application are presented in the following drawings and description. Other features, objects, and advantages of the present application will become apparent from the specification, drawings, and claims.

[0042] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments of the present application. Obviously, what is described below is only some embodiments of the present application. For those skilled in the art, based on these drawings and without creative efforts, other drawings can also be obtained.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0044] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only for more clearly explaining the technical solution of the present application, and are only examples, and the protection scope of the present application shall not be limited thereby.

[0045] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in this specification are only for describing specific embodiments and are not intended to limit the present application. The terms "comprising" and "having" and any variations thereof in the description of the specification, claims and above drawings of the present application are intended to cover non-exclusive "comprising".

[0046] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only for distinguishing different objects, and should not be understood as indicating or suggesting relative importance, or implicitly indicating the number of technical features indicated, a specific order or a primary-secondary relationship. In the description of the embodiments of the present application, unless specifically defined otherwise, the meaning of "a plurality" is two or more.

[0047] As used herein, the term "example" means that a particular feature, structure, or characteristic described in connection with an example may be included in at least one example of the present application. The appearance of this phrase at each position in the specification does not necessarily refer to the same example, nor is it an independent or alternative example mutually exclusive with other examples. Those skilled in the art can explicitly and implicitly understand that the examples described herein can be combined with other examples.

[0048] In the description of the examples of the present application, the term "and / or" is merely a relationship for describing related objects, indicating that three relationships may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. Also, the character " / " in this specification generally represents that the related objects before and after are in an "or" relationship.

[0049] In the description of the examples of the present application, the term "plurality" refers to two or more (including two), and similarly, "a plurality of sets" refers to two or more sets (including two sets), and "a plurality of sheets" refers to two or more sheets (including two sheets).

[0050] In the description of the examples of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is the orientation or positional relationship shown based on the drawings, and is only for facilitating and simplifying the description of the examples of the present application, and does not indicate or imply that the device or element mentioned must have a specific orientation and be configured and operated in a specific orientation. Therefore, it should not be understood as a limitation to the examples of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, technical terms such as "attachment", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral one, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a communication inside two elements or an interaction relationship between two elements. Those skilled in the art may understand the specific meaning of the above terms in the embodiments of the present application according to specific situations.

[0052] Currently, from the perspective of the development trend of the market, the application of battery packs is becoming increasingly widespread. Battery packs are widely applied not only in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also in multiple fields such as electric bicycles, electric motorcycles, electric vehicles, and military equipment and aerospace. With the continuous expansion of the application fields of battery packs, the market demand for them is also increasing continuously.

[0053] The applicant of the present application noticed that in the manufacturing process of the electrode assembly of the battery, as an important insulating material, the separator body is generally wound after manufacturing is completed to form a separator roll for storage, which facilitates its use in subsequent processes. The wound separator roll generally has at least one separator body wound. When a plurality of separator bodies are connected end to end and wound, an insulating connecting member is installed between adjacent separator bodies to integrally connect all separator bodies. In the subsequent manufacturing process of the electrode assembly, the separator is gradually peeled off from the separator roll, and the negative electrode plate and the positive electrode plate are overlapped and wound to obtain the final electrode assembly.

[0054] However, in the process of peeling the separator body from the separator roll and winding it, the position of the end of each separator body cannot be determined, that is, the position of the connecting member between two adjacent separator bodies cannot be determined or the remaining winding length of the separator body cannot be determined. Therefore, in the winding process, there will be a defective phenomenon that the insulating connecting member is wound into the internal structure of the electrode assembly or a situation where the length of the end is insufficient and damage occurs during the winding process of the separator body, thereby affecting the production quality and winding efficiency of the electrode assembly.

[0055] In order to improve the production quality of the electrode assembly, the applicant has, through research, been able to install a corresponding structure to detect the position of the end of the separator and give an early warning of the position of the end of the separator or the connecting member in advance.

[0056] Based on the above considerations, in order to avoid the influence on the production quality and winding efficiency of the electrode assembly product due to the inability to determine the position of the end of the separator winding during the winding process of the separator, the applicant of this application has, through intensive research, designed a separator roll. The separator roll includes a separator body and an early warning coating 232 provided on the separator body. The separator body has a tip and an end along the longitudinal direction and is wound along the longitudinal direction to form a separator roll. The early warning coating 232 is configured to have a first preset length spaced from the end of the separator body where it is located. At this time, the early warning coating 232 gives an early warning of the position of the end of the separator body where it is located in advance. After the early warning coating 232 is detected, it indicates that there is still a first preset length at the end of the separator body at this time. Thereby, a preliminary judgment is made and corresponding adjustments are made to avoid the situation where the winding length of the end is insufficient or the connecting member at the end is directly wound into the interior of the electrode assembly, and to ensure the production quality and winding efficiency of the electrode assembly.

[0057] The battery disclosed in the embodiments of the present application can be used in power-consuming devices such as vehicles, ships, or aircraft, but is not limited thereto. The power supply system of this power-consuming device can be configured using the battery disclosed in the present application. The attachment body according to the present application is a structure for attaching a battery in a power-consuming device.

[0058] The embodiments of the present application provide a power-consuming device that uses a battery as a power source. The power-consuming device may be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery vehicle, an electric vehicle, a steamship, a spacecraft, etc. Here, the electric toy may include a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric steamship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a spaceplane, and a spaceship, etc.

[0059] For the convenience of description, the following embodiments will be described by taking the power-consuming device of an embodiment of the present application as a vehicle 1000 as an example.

[0060] Referring to FIG. 1, FIG. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a gasoline vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used for power supply to the vehicle 1000. For example, the battery 100 may be used as the operating power supply of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for starting the vehicle 1000, navigation, and operating power consumption requirements during driving.

[0061] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also provide driving power to the vehicle 1000 as the driving power source of the vehicle 1000, replacing or partially replacing fuel oil or natural gas.

[0062] Referring to FIG. 2, FIG. 2 is an exploded view of the battery 100 according to some embodiments of the present application. The battery 100 includes a housing 10 and battery cells 20, and the battery cells 20 are housed within the housing 10. Here, the housing 10 is used to provide a housing space for the battery cells 20, and the housing 10 may adopt various structures. In some embodiments, the housing 10 may include a first part 11 and a second part 12. The first part 11 and the second part 12 are overlapped with each other, and the first part 11 and the second part 12 jointly define a housing space for housing the battery cells 20. The second part 12 has a hollow structure with one end open, and the first part 11 may have a plate-like structure. By covering the first part 11 on the opening side of the second part 12, the first part 11 and the second part 12 together define a housing space. The first part 11 and the second part 12 may both have a hollow structure with one side open, and the opening side of the first part 11 is covered on the opening side of the second part 12. Of course, the housing 10 formed by the first part 11 and the second part 12 may have various shapes, such as a cylinder, a cuboid, etc.

[0063] In the battery 100, there may be a plurality of battery cells 20. The plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel. Series-parallel connection means that among the plurality of battery cells 20, there are both series connections and parallel connections. The plurality of battery cells 20 may be directly connected in series, in parallel, or in series-parallel, and the whole composed of the plurality of battery cells 20 may be housed in the housing 10. Of course, the battery 100 may first connect a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module form, and then connect a plurality of battery modules in series, in parallel, or in series-parallel to form an integrated unit and be housed in the housing 10. The battery 100 may further include other structures. For example, this battery 100 may further include a bus bar member for realizing the electrical connection between the plurality of battery cells 20.

[0064] Here, each battery cell 20 may be a secondary battery or a primary battery, and may be a lithium-sulfur battery, a sodium-ion battery, a magnesium-ion battery, etc., but is not limited thereto. The battery cell 20 may have a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes.

[0065] Referring to FIG. 3, FIG. 3 is a schematic exploded view of a battery cell 20 according to some embodiments of the present application. The battery cell 20 is the minimum unit constituting the battery. As shown in FIG. 3, the battery cell 20 includes an end cap 21, a case 22, an electrode assembly 23, and other functional members.

[0066] The end cap 21 refers to a member that covers the opening of the case 22 and blocks the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may conform to the shape of the case 22 to match the case 22. In some embodiments, the end cap 21 may be manufactured from a material having a certain hardness and strength (such as an aluminum alloy). In this way, when the end cap 21 is subjected to extrusion or impact, it is less likely to deform, so that the battery cell 20 can have higher structural strength and the safety performance can also be improved. Functional members such as electrode terminals 211 may be installed on the end cap 21. The electrode terminal may be used to be electrically connected to the electrode assembly 23 in order to output or input the electrical energy of the battery cell 20. In some embodiments, the end cap 21 may further be provided with a pressure relief structure 24 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member may further be installed inside the end cap 21, and the insulating member may be used to partition the electrical connection member in the case 22 and the end cap 21 so as to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0067] Case 22 is an assembly for fitting into end cap 21 to form the internal environment of battery cell 20, where the formed internal environment may be used to accommodate electrode assembly 23, electrolyte and other components. Case 22 and end cap 21 may be independent components. An opening may be provided on case 22, and the internal environment of battery cell 20 is formed by covering the opening on end cap 21 at the opening location. Without limitation, end cap 21 and case 22 may be integrated. Specifically, end cap 21 and case 22 may first form a common connection surface before other components enter the case. When it is necessary to package the interior of case 22, end cap 21 is further used to cover case 22. Case 22 may have various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of case 22 may be determined according to the specific shape and dimensional size of electrode assembly 23. The material of case 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of this application do not impose special restrictions on this.

[0068] Electrode assembly 23 is a component that generates an electrochemical reaction within battery cell 20. Case 22 may contain one or more electrode assemblies 23. Electrode assembly 23 is mainly formed by winding or laminating a negative electrode plate and a positive electrode plate, and generally a separator body is provided between the negative electrode plate and the positive electrode plate. The portions of the negative electrode plate and the positive electrode plate having active materials constitute the main body of the electrode assembly, and the portions of the negative electrode plate and the positive electrode plate without active materials respectively constitute tabs. The negative tab and the positive tab may both be located at one end of the main body, or may be located at both ends of the main body respectively. During charging and discharging of the battery, the negative active material and the positive active material react with the electrolyte, and the tabs are connected to the electrode terminals to form an electric current circuit.

[0069] According to some embodiments of the present application, referring to FIGS. 4 to 5 and further referring to FIGS. 6 to 8, the present application provides a separator roll 2000 including a separator body 231 and an early warning coating 232. The separator body 231 has a tip a and a terminal b along the longitudinal direction F1 and is configured to be wound along the longitudinal direction F1. The early warning coating 232 is provided on the separator body 231 and is configured to be separated from the terminal b by a first preset length L1.

[0070] The separator body 231 is a separator having an isolation function, that is, it is installed between the negative electrode plate and the positive electrode plate in the electrode assembly 23 of the battery 100. The separator body 231 may be made of PP, PE or PI material. The separator body 231 has electrical insulation, guarantees mechanical isolation between the negative electrode plate and the positive electrode plate, and the separator body 231 has a certain pore size and porosity to guarantee low resistance and high ionic conductivity.

[0071] In the longitudinal direction F1, that is, the direction indicated by the arrow F1 in FIGS. 6 to 8, the separator body 231 forms a tip a and a terminal b at both opposite ends in the longitudinal direction F1. When wound along the longitudinal direction F1 of the separator body 231, the separator roll 2000 shown in FIGS. 4 to 5 is formed, and its winding direction F1 is converted from the longitudinal direction F1. After the winding is completed, the tip a of the separator body 231 is located relatively outward, and the terminal b of the separator body 231 is located relatively inward. When the separator body 231 is peeled off from the separator roll 2000, the tip a is first pulled and peeled off from the separator roll 2000, and the terminal b is then peeled off from the separator roll 2000, thereby completely peeling off one separator body 231.

[0072] The early warning coating 232 is a structure for giving an early warning in advance to the end b of the separator body 231 where it is located. It can be provided on the separator body 231 and can be identified by an external detection device, and can be formed on the surface of the separator body 231 by means such as laying or pasting. When the detection device identifies this early warning coating 232, at this time, a signal having a distance of a first preset length L1 from the end b of this separator body 231 is transferred to the downstream device, and it is prompted to perform operations such as cutting, thereby giving an early warning to the position of the end b of the separator body 231 in advance.

[0073] The first preset length L1 is the length of L1 shown in FIGS. 6 to 8. The magnitude of the distance of the first preset length L1 may be set correlatively based on the lengths of the positive electrode plate and the negative electrode plate wound together with the separator body 231, and this application does not limit it here. By controlling the distance of the first preset length L1, sufficient time for the downstream device to operate is given, and in the process of the electrode assembly 23 performing high-speed winding, the situation where the length of the end b is insufficient and damage occurs, or the situation where the non-separator body 231 structure connected to the end b is directly wound inside the electrode assembly 23 is avoided.

[0074] In this way, the position of the end b of the separator body 231 where it is located is given an early warning in advance by the early warning coating 232. After the early warning coating 232 is detected, at this time, it indicates that there is still a first preset length L1 at the end b of the separator body 231, thereby pre-judging the position of the end b of the separator body 231 and making corresponding adjustments, thereby avoiding the situation where the length of the end b is insufficient and damage occurs or the situation where the non-separator body 231 structure connected to the end b is directly wound inside the electrode assembly 23, and ensuring the quality of the electrode assembly 23.

[0075] For better understanding, the early warning coating 232 may be wound inside the electrode assembly 23, which does not damage the structure of the electrode assembly 23 and is not involved in the electrochemical reaction of the battery 100.

[0076] In some embodiments, the separator roll 2000 includes a plurality of separator bodies 231, and every two adjacent separator bodies 231 are connected end to end by a connecting member 30.

[0077] The connecting member 30 is a structure for connecting the ends b and the tips a of two adjacent separator bodies 231. The original purpose of its installation is to integrally connect a plurality of separator bodies 231 and wind them to form the separator roll 2000, making storage or subsequent use easier. It is not part of the electrode assembly 23 and should not be wound around the electrode assembly 23. Generally, the connecting member 30 is made of an insulating material, and it can connect the ends b and the tips a of two adjacent separator bodies 231 by means such as fixed connection or adhesive connection.

[0078] Also, a support member 40 may be installed. After sequentially connecting a plurality of separator bodies 231 end to end, they are wound around the outer periphery of the support member 40 to form a cylindrical separator roll 2000. Without installing the support member 40, more separator bodies 231 may be accommodated in the same separator roll 2000 by overlapping and winding a plurality of separator bodies 231.

[0079] In this way, by installing the connecting member 30, a plurality of separator bodies 231 can be wound around one separator roll 2000 simultaneously. At this time, by installing the early warning coating 232, the specific position of the connecting member 30 can be known, and in the process of the electrode assembly 23 being wound at high speed, the phenomenon that the connecting member 30 between the separator bodies 231 is wound around the electrode assembly 23 to form a defective electrode assembly 23 can be avoided.

[0080] In some embodiments, for example, the connecting member 30 includes a bonding adhesive formed by mixing one or more of polyethylene terephthalate, epoxy resin, polyurethane, unsaturated polyester resin, phenolic resin, polyacrylic acid resin, polyvinyl chloride resin, polysulfide rubber, silicone rubber, polyurethane rubber, chloroprene rubber, and butyl rubber, and can bond and connect the tips a and the ends b of two adjacent separator bodies 231.

[0081] Here, polyethylene terephthalate is a common resin material, and the bonding adhesive formed thereby has excellent physical and mechanical properties, abrasion resistance, size stability, and electrical insulation properties, and can connect adjacent separator bodies 231.

[0082] When it is necessary to wind a plurality of separator bodies 231 around the separator roll 2000, the bonding adhesive is attached to the connection positions of every two separator bodies 231 to connect and wind the plurality of separator bodies 231 to form the separator roll 2000. When it is necessary to peel the separator body 231 from the separator roll 2000, the early warning coating 232 warns in advance the position of the bonding adhesive, prompts the downstream device to perform processing such as cutting on the end b of the separator body 231, and avoids the bonding adhesive being wound inside the electrode assembly 23 along with the separator body 231, thereby affecting the production quality of the electrode assembly.

[0083] In some embodiments, each separator body 231 is provided with one early warning coating 232.

[0084] The early warning coating 232 is used to perform position early warning for the end b of the separator body 231 where it is located. In the process of the electrode assembly 23 being wound at high speed, it avoids the situation where the length at the end b of the separator body 231 is insufficient and damage occurs, and guarantees position early warning for the end b of each separator body 231 in the separator roll 2000. Thereby, it effectively gives an early warning for the ends of each separator body 231 in the process of the separator body 231 peeling off.

[0085] In some embodiments, the early warning coating 232 is applied on the surface of the separator body 231, and the early warning coating 232 extends along the longitudinal direction F1 and / or the width direction F2 of the separator body 231.

[0086] The width direction F2 of the separator body 231 is the direction indicated by F2 shown by the arrow in FIGS. 6 to 8. The longitudinal direction F1 and the width direction F2 of the separator body 231 are perpendicular. Ensure that the early warning coating 232 has a sufficient size in the width direction F2 and / or the longitudinal direction F1 of the separator body 231, thereby guaranteeing that the early warning coating 232 can be detected by external settings.

[0087] In some embodiments, the early warning coating 232 has a second preset length L2 in the longitudinal direction F1 of the separator body 231, and the range of the second preset length L2 is 1 millimeter (mm) - 1000 mm.

[0088] To be understandable, the separator roll 2000 is formed by being wound along the longitudinal direction F1 of the separator body 231. The separation of the separator body 231 from the separator roll 2000 is also performed along the longitudinal direction F1 of the separator body 231. An external detection device is installed in the separation path of the separator body 231 to ensure the second preset length L2 of the early warning coating 232, so that when the early warning coating 232 passes through the external detection device, it can have a sufficient detection distance, thereby ensuring that the early warning coating 232 can be effectively detected.

[0089] In some embodiments, the second preset length L2 ranges from 10 mm to 50 mm.

[0090] In this way, by controlling the range of the second preset length L2 to be 10 mm - 50 mm, it is ensured that the early warning coating 232 can be effectively detected by the external detection device, and it is avoided that the second preset length L2 is too long.

[0091] In some exemplary embodiments, the early warning coating 232 may extend along the width direction F2 of the separator body 231 to both sides of the width direction F2 of the separator body 231, or the early warning coating 232 may be installed at the central part of the separator body 231 without extending to both sides.

[0092] In some embodiments, in the width direction F2 of the separator body 231, at least one side edge of the early warning coating 232 overlaps with the edge of the separator body 231.

[0093] This embodiment includes three situations: in the width direction F2 of the separator body 231, the left side edge of the early warning coating 232 overlaps with the edge of the separator body 231, the right side edge of the early warning coating 232 overlaps with the edge of the separator body 231, and both side edges of the early warning coating 232 overlap with both side edges of the separator body 231.

[0094] In the width direction F2 of the separator body 231, when both side edges of the early warning coating 232 overlap with the both side edges of the separator body 231, at this time, the early warning coating 232 may be installed along the width direction F2 of the separator body 231, the manufacturing process is simple, and the early warning coating 232 can play a role of being identified by a detection device.

[0095] In some embodiments, the manufacturing process of the electrode assembly further includes identifying the state of the tab. Specifically, it is possible to identify whether the tab is folded by a folding sensor.

[0096] In the width direction F2 of the separator body 231, when the left side edge of the early warning coating 232 overlaps with the edge of the separator body 231 or the right side edge of the early warning coating 232 overlaps with the edge of the separator body 231, at this time, the side of the early warning coating 232 that does not overlap with the edge of the separator body 231 can be distinguished by the tab on this side, preventing misjudgment from occurring when the early warning coating 232 passes through the sensor for identifying the tab, that is, preventing the phenomenon that the sensor senses the early warning coating 232 and misjudges it as a tab.

[0097] As can be understood, the above embodiments are described by taking the state where the separator roll is placed vertically along the winding direction as an example, but the separator roll may be placed in other ways during actual application.

[0098] In some embodiments, in the width direction F2 of the separator body 231, both side edges of the early warning coating 232 do not overlap with both side edges of the separator body 231.

[0099] As can be understood, after the tab folding sensor that penetrates the entire separator body 231 and senses the tabs on both sides in the width direction F2 of the separator body 231 during the winding process identifies the early warning coating 232, it gives a false alarm for the tab folding. Therefore, by positioning the early warning coating 232 at the central part of the separator body 231 without extending it to both ends in the width direction F2 of the separator body 231 and distinguishing its position from the tabs located at both ends in the width direction F2 of the separator body 231, it is possible to prevent the occurrence of misjudgment when the early warning coating 232 further passes through the sensor that identifies the tabs, that is, the phenomenon that the sensor senses the early warning coating 232 and misjudges it as a tab. Thereby, false warnings in the manufacturing process of the electrode assembly can be reduced, and the production efficiency can be improved.

[0100] In some embodiments, in the width direction F2 of the separator body 231, the distance range between the two side edges of the early warning coating 232 and the two side edges of the separator body 231 is 1 mm - 1000 mm.

[0101] The distances between the two side edges of the early warning coating 232 and the two side edges of the separator body 231 may be equal. In this case, the early warning coating 232 is located in the middle in the width direction F2 of the separator body 231. Also, the distances between the two side edges of the early warning coating 232 and the two side edges of the separator body 231 do not have to be equal. In this case, the early warning coating 232 is installed offset to one side in the width direction F2 of the separator body 231.

[0102] In some embodiments, in the width direction F2 of the separator body 231, the distance range between the two side edges of the early warning coating 232 and the two side edges of the separator body 231 is 5 mm - 30 mm.

[0103] Being in the range of 5 mm - 30 mm can ensure that the early warning coating 232 can be effectively detected by an external detection device, and at the same time, the mutual influence between the early warning coating 232 and the tabs can be avoided.

[0104] The distance between the two side edges of the early warning coating 232 and the two side edges of the separator body 231 needs to be determined based on the size of the separator body 231 itself in the width direction F2. As can be understood, the distance between the two side edges of the early warning coating 232 and the two side edges of the separator body 231 must be smaller than the size of the separator body 231 itself in the width direction F2.

[0105] The early warning coating 232 is formed of a pigment, an adhesive, or a mixture paint, which is provided on the surface of the separator body 231 and has properties clearly different from those of the separator body 231. For example, parameters such as the hue, lightness, chroma, glossiness, and color difference of the surfaces of the two are different, so that the early warning coating 232 can be accurately and easily detected by an external detection device.

[0106] By directly applying the early warning coating 232 to the surface of the separator body 231, an early warning coating 232 that can be detected by an external detection device can be formed simply and quickly, and the surface of the separator body 231 is not damaged. Concave grooves or protrusions may be formed on the surface of the separator body 231. In some exemplary embodiments, the early warning coating 232 may be formed on the groove wall of the concave groove or the surface of the protrusion, thereby ensuring that the early warning coating 232 can be directly and quickly identified by an external detection device during the process of the separator body 231 being peeled off.

[0107] In some embodiments, the early warning coating 232 includes at least one or a mixture of a plurality of rubbers, polyacrylic acid, polymethacrylic acid, methyl polyacrylate, ethyl polyacrylate, pure acrylic emulsion, polyacrylic acid-styrene copolymer, polyvinyl pyrrolidone, styrene butadiene rubber, epoxy resin, neopentyl glycol diacrylate, sodium polyacrylate series, fluorine-containing polyolefin.

[0108] Fluorine-containing polyolefin adhesives include, but are not limited to, rubber materials made from polyvinylidene fluoride (PVDF), vinylidene fluoride copolymers, or modified (e.g., modified with carboxylic acid, acrylic acid, acrylonitrile, etc.) derivatives thereof.

[0109] The early warning coating 232 is rapidly formed by coating the surface of the separator body 231. In some exemplary embodiments, rubber No. 5 made of natural rubber with a faster setting time and higher adhesion strength may be selected.

[0110] In some embodiments, the color of the separator body 231 is different from the color of the early warning coating 232.

[0111] Colored colors have three basic characteristics: hue, purity (also called chroma or saturation), and lightness. In color science, they are also called the three major elements of color or the three attributes of color. Colors with a chroma of 0 belong to the achromatic color system. For example, by applying an early warning coating 232 having a color difference from the separator body 231 to the separator body 231, the separator body 231 and the early warning coating 232 with different colors are formed, and the early warning coating 232 is made to have an early warning effect.

[0112] In some embodiments, the color difference of the separator body 231 is different from the color difference of the early warning coating 232.

[0113] The range of RGB values of the color difference of the separator body 231 and the color difference of the early warning coating 232 is 1 - 225, thereby ensuring that the color difference of the early warning coating 232 can be clearly distinguished from the separator body 231, and thereby it is recognized that an early warning effect occurs.

[0114] Regarding a specific embodiment, it can be controlled so that the surface of the separator body 231 becomes white, and the lower limit of the RGB value of the color of the early warning coating 232 can be set to (1, 176, 241) and the upper limit to (25, 38, 213).

[0115] In other embodiments, the surface of the separator body 231 may be set to any color, and the surface of the early warning coating 232 may be set to a color different from the surface of the separator body 231. The present application is not limited herein.

[0116] In some embodiments, the RGB values of the color difference of the separator body 231 and the color difference of the early warning coating 232 are in the range of 20 - 220.

[0117] Within this range, it is ensured that the color difference of the early warning coating 232 can be clearly distinguished from the separator body 231.

[0118] In some embodiments, the early warning coating 232 is in the shape of a rectangle, a circle, a semi - circle, a trapezoid, or a triangle.

[0119] The rectangle, the circle, the semi - circle, the trapezoid, or the triangle can all form extensions in at least two directions, whereby the early warning coating 232 has a second preset length L2 in the longitudinal direction F1 of the separator body 231 and extends to both sides of the separator body 231 along the width direction F2.

[0120] In this way, the shape of the early warning coating 232 is diverse, the processing operation of the early warning coating 232 is simple, and the early warning function can be realized.

[0121] According to another aspect of the present application, a method for manufacturing a separator roll is further provided. Here, referring to FIG. 11, the manufacturing method specifically includes: In S10, a separator body 231 is provided, and a tip a and a terminal b are formed along the longitudinal direction F1 of the separator body 231 itself. In S30, an early warning coating 232 is installed on the separator body 231, and the early warning coating 232 is configured to be separated from the terminal b by a first preset length L1. In S50, it includes winding the separator body 231 along the longitudinal direction F1 to form the separator roll 2000.

[0122] Regarding the interpretation of the terms related to the above and below methods, since they have all been described in the above content, they will not be further explained below.

[0123] In this way, the position of the end b of the separator body 231 where the early warning coating 232 is located is warned in advance and early. After the early warning coating 232 is detected, at this time, it indicates that there is still a first preset length L1 at the end b of the separator body 231. Thereby, the position of the end b of the separator body 231 is judged in advance and corresponding adjustments are made, thereby avoiding the situation where the length of the end b is insufficient and damage occurs or the non-separator body 231 structure connected to the end b is directly wound inside the electrode assembly 23, and ensuring the quality of the electrode assembly 23.

[0124] In some embodiments, referring to FIG. 12, providing the separator body 231 specifically In S11, it includes providing a plurality of separator bodies 231, and including that every two separator bodies 231 are connected end to end.

[0125] In this way, a plurality of separator bodies 231 can be wound around one separator roll 2000 at the same time. Realize the continuous winding and continuous peeling of the separator body 231, thereby improving the production efficiency.

[0126] In some embodiments, referring to FIG. 12, installing the early warning coating 232 on the separator body 231 specifically In S31, it includes installing one early warning coating 232 on each separator body 231.

[0127] The early warning coating 232 is used to perform position early warning for the end b of the separator body 231 where it is located. In the process of the electrode assembly 23 being wound at high speed, it avoids the situation where the length at the end b of the separator body 231 is insufficient and damage occurs, and ensures that position early warning of the end b is performed for each separator body 231 in the separator roll 2000. Thereby, in the process of the separator body 231 peeling off, effective early warning is performed for the ends of each separator body 231.

[0128] In some embodiments, referring to FIG. 13, the end-to-end connection of the two separator bodies 231 In S12, further includes connecting the tip a and the end b of each two separator bodies 231 via the connecting member 30.

[0129] By installing the connecting member 30, a plurality of separator bodies 231 can be wound simultaneously on one separator roll 2000. At this time, by installing the early warning coating 232, the specific position of the connecting member 30 can be known, and in the process of the electrode assembly 23 being wound at high speed, the phenomenon that the connecting member 30 between the separator bodies 231 is wound on the electrode assembly 23 to form a defective electrode assembly 23 can be avoided.

[0130] In some embodiments, referring to FIG. 14, connecting the tip a and the end b of each two separator bodies 231 via the connecting member 30 specifically In S121, providing one or more of polyethylene terephthalate, epoxy resin, polyurethane, unsaturated polyester resin, phenolic resin, polyacrylic acid resin, polyvinyl chloride resin, polysulfide rubber, silicone rubber, polyurethane rubber, chloroprene rubber, butyl rubber, mixing to form a bonding adhesive, and bonding the tip a and the end b of each two separator bodies 231.

[0131] When it is necessary to wind a plurality of separator bodies 231 around the separator roll 2000, the plurality of separator bodies 231 are connected and wound to form the separator roll 2000 by attaching a bonding adhesive to the connection positions of every two separator bodies 231. When it is necessary to peel the separator body 231 from the separator roll 2000, the early warning coating 232 warns in advance the position of the bonding adhesive, prompts the operator to process the bonding adhesive, and avoids the bonding adhesive being wound inside the electrode assembly 23 along with the separator body 231, thereby affecting the product yield of the electrode assembly.

[0132] In some embodiments, referring to FIG. 15, installing the early warning coating 232 on the separator body 231 In S32, further includes applying the early warning coating 232 to the surface of the separator body 231.

[0133] In this way, the early warning coating 232 can be formed simply and quickly, and can be detected by an external detection device without damaging the surface of the separator body 231. Concave grooves or protrusions may be formed on the surface of the separator body 231. In some exemplary embodiments, the early warning coating 232 may be formed on the groove wall of the concave groove or the surface of the protrusion, thereby ensuring that the early warning coating 232 can be directly and quickly identified by an external detection device during the process of peeling the separator body 231.

[0134] In some embodiments, referring to FIG. 16, installing the early warning coating 232 on the surface of the separator body 231 In S321, further includes applying the early warning coating 232 by extending along the longitudinal direction F1 of the separator body 231 and applying the early warning coating 232 by extending along the width direction F2 of the separator body 231.

[0135] The early warning coating 232 is sized sufficiently in the width direction F2 and / or the longitudinal direction F1 of the separator body 231, thereby ensuring that the early warning coating 232 can be detected by an external detection device.

[0136] In some embodiments, referring to FIG. 17, applying the early warning coating 232 by extending along the longitudinal direction F1 of the separator body 231 In S3211, further includes applying an early warning coating 232 having a second preset length L2 along the longitudinal direction F1 of the separator body 231, and the range of the second preset length L2 is 1 mm - 1000 mm.

[0137] As can be understood, the separator roll 2000 is formed by being wound along the longitudinal direction F1 of the separator body 231, and the separation of the separator body 231 from the separator roll 2000 is also performed along the longitudinal direction F1 of the separator body 231. An external detection device is installed in the separation path of the separator body 231 to ensure the second preset length L2 of the early warning coating 232, so that the early warning coating 232 can have a sufficient detection distance when passing through the external detection device, thereby ensuring that the early warning coating 232 can be effectively detected.

[0138] In some embodiments, referring to FIG. 18, applying the early warning coating 232 by extending along the longitudinal direction F1 of the separator body 231 In S32111, further includes applying an early warning coating 232 having a second preset length L2 along the longitudinal direction F1 of the separator body 231, and the range of the second preset length L2 is 10 mm - 50 mm.

[0139] In this way, the range of the second preset length L2 is controlled to be 10 mm - 50 mm, so that when the early warning coating 232 passes through an external detection device, it can have a sufficient detection distance, thereby ensuring that the early warning coating 232 can be effectively detected.

[0140] In some embodiments, referring to FIG. 17, applying the early warning coating 232 by extending along the width direction F2 of the separator body 231 In S3212, it further includes applying the early warning coating 232 along the width direction F2 of the separator body 231 until the distance range between both side edges of the early warning coating 232 and both side edges of the separator body 231 reaches 1 mm - 1000 mm.

[0141] The distance between both side edges of the early warning coating 232 and both side edges of the separator body 231 may be equal. In this case, the early warning coating 232 is located in the middle of the width direction F2 of the separator body 231. Also, the distance between both side edges of the early warning coating 232 and both side edges of the separator body 231 may not be equal. In this case, the early warning coating 232 is installed offset to one side of the width direction F2 of the separator body 231.

[0142] In some embodiments, referring to FIG. 18, applying the early warning coating 232 by extending along the width direction F2 of the separator body 231 In S32121, it further includes applying the early warning coating 232 along the width direction F2 of the separator body 231 until the distance range between both side edges of the early warning coating 232 and both side edges of the separator body 231 reaches 5 mm - 30 mm.

[0143] Being in the range of 5 mm - 30 mm can ensure that the early warning coating 232 can be effectively detected by an external detection device, and at the same time, the mutual influence between the early warning coating 232 and the tab can be avoided.

[0144] In some embodiments, referring to FIG. 19, before installing the early warning coating 232 on the surface of the separator body 231, S20 further includes providing an early warning coating 232, and the early warning coating 232 is formed by mixing at least one or more of rubber, polyacrylic acid, polymethacrylic acid, methyl polyacrylate, ethyl polyacrylate, pure acrylic emulsion, polyacrylic acid-styrene copolymer, polyvinyl pyrrolidone, styrene butadiene rubber, epoxy resin, neopentyl glycol diacrylate, sodium polyacrylate series, fluorine-containing polyolefin.

[0145] The fluorine-containing polyolefin-based adhesive includes, but is not limited to, rubber materials manufactured from polyvinylidene fluoride (PVDF), vinylidene fluoride copolymer or their modified (e.g., modified by carboxylic acid, acrylic acid, acrylonitrile, etc.) derivatives.

[0146] In this way, the early warning coating 232 can be quickly formed on the surface of the separator body 231. In some exemplary embodiments, 5# rubber manufactured from natural rubber with a faster coagulation time and higher adhesion strength may be selected.

[0147] In some embodiments, the color of the separator body 231 is different from the color of the early warning coating 232.

[0148] Colored colors have three basic characteristics: hue, purity (also called chroma, saturation), and lightness. In color science, they are also called the three major elements of color or the three attributes of color. Colors with a chroma of 0 belong to the achromatic color system. For example, by applying an early warning coating 232 having a color difference from the separator body 231 to the separator body 231, the separator body 231 and the early warning coating 232 with different colors are formed, and the early warning coating 232 plays an early warning role.

[0149] In some embodiments, the color difference of the separator body 231 is different from the color difference of the early warning coating 232.

[0150] The range of the RGB values of the color difference of the separator body 231 and the color difference of the early warning coating 232 is 1 - 225, thereby ensuring that the color difference of the early warning coating 232 can be clearly distinguished from the separator body 231, and thereby being identified as generating an early warning effect.

[0151] Regarding a specific embodiment, it can be controlled so that the surface of the separator body 231 becomes white, and the lower limit of the RGB value of the color of the early warning coating 232 can be set to (1, 176, 241) and the upper limit can be set to (25, 38, 213).

[0152] In other embodiments, the surface of the separator body 231 can be set to any color, and the surface of the early warning coating 232 can be set to a color different from the surface of the separator body 231, and the present application does not limit this here.

[0153] In some embodiments, the RGB values of the color difference of the separator body 231 and the color difference of the early warning coating 232 are in the range of 20 - 220.

[0154] Within this range, it is ensured that the color difference of the early warning coating 232 can be clearly distinguished from the separator body 231.

[0155] In the above embodiments, the method of installing the early warning coating 232 on the separator body 231 and giving an early warning to its end b in advance is similarly applicable to the positive electrode plate and the negative electrode plate, and the present application does not explain this further here.

[0156] According to some embodiments of the present application, referring to FIG. 20, the present application further provides a method for manufacturing an electrode assembly. Referring to FIG. 21, specifically, At A10, it is to provide a roll material, which includes the positive electrode plate roll 4000, the separator roll 2000 in any one of the above embodiments, and the negative electrode plate roll 3000. Here, the separator roll 2000 includes a separator body 231 and an early warning coating 232 installed on the separator body 231. The separator roll 2000 has a tip a and a terminal b formed at both ends along its winding direction F1, and the early warning coating 232 is configured to be separated from the terminal b by a first preset length L1. At A30, it is to laminate and wind the positive electrode plate 234 in the positive electrode plate roll 4000, the separator body 231 in the separator roll 2000, and the negative electrode plate 233 in the negative electrode plate roll 3000. At A40, it includes detecting whether the early warning coating 232 is installed on the separator body 231 during the winding process.

[0157] Specifically, install a winding device 5000, laminate the positive electrode plate 234 in the positive electrode plate roll 4000, the separator body 231 in the separator roll 2000, and the negative electrode plate 233 in the negative electrode plate roll 3000 and wind them onto the winding device 5000 to manufacture the electrode assembly 23 through the winding process.

[0158] The winding device 5000 has a traction structure and a winding structure. The traction structure can connect the tip a of the positive electrode plate roll 4000, the tip a of the separator roll 2000, and the tip a of the negative electrode plate roll 3000 to the winding structure, and then control the winding structure to rotate at high speed according to the set circumferential direction, peel the positive electrode plate 234, the separator body 231, and the negative electrode plate 233 from the positive electrode plate roll 4000, the separator roll 2000, and the negative electrode plate roll 3000, and thereby wind them onto the winding structure to form the electrode assembly 23.

[0159] The manufacturing method of the electrode assembly includes the manufacturing method of the separator roll in any one of the above embodiments and has all its working effects, which will not be further described herein in this application.

[0160] The winding direction F1 refers to the separator roll 2000 formed by winding the separator body along the longitudinal direction F1 of the separator body 231. After the winding is completed, the longitudinal direction F1 is the winding direction F1.

[0161] The positive electrode plate roll 4000 and the negative electrode plate roll 3000 refer to a material structure formed by laminating and winding at least one positive electrode plate 234 and at least one negative electrode plate 233 in the same way as the separator roll 2000. After being manufactured from the production lines of the positive electrode plate 234 and the negative electrode plate 233, it is wound into a roll shape, thereby facilitating the subsequent manufacture of the electrode assembly 23.

[0162] The detection device 6000 is a device for detecting the early warning coating 232 on the separator body 231. The early warning coating 232 is configured with a first preset length L1 spaced from the end b of the separator body 231. When the early warning coating 232 is detected, it indicates that there is a first preset length L1 from the end b of the separator body 231 at this time, and at this time, the high-speed rotation state of the winding mechanism is changed, or other operations are performed.

[0163] In this way, by the detection assembly detecting the early warning coating 232, an early warning is given in advance to the end b of the separator body 231, thereby avoiding the situation where the length of the end b is insufficient and damage occurs, or the situation where the non-separator body 231 structure connected to the end b is directly wound inside the electrode assembly 23, and ensuring the quality of the electrode assembly 23.

[0164] In some embodiments, referring to FIG. 22, optionally, after detecting whether the early warning coating 232 is installed on the separator body 231, it further includes the following.

[0165] In A50, if so, control is performed such that the positive electrode plate 234 and the negative electrode plate 233 stop winding, and the separator roll 2000 is pulled to continue winding a distance of at least a first preset length L1 and then stop winding.

[0166] The positive electrode plate 234 and the negative electrode plate 233 do not participate in winding, wind independently with respect to the separator body 231, and stop after winding a distance of at least the set first preset length L1. At this time, the end b of the separator body 231 in the separator roll 2000 separates from the separator roll 2000. If there is still a separator body 231 in the separator roll 2000 at this time, since the connecting member 30 between the two separator bodies 231 has already been peeled off from the separator roll 2000 and is not wound between the positive electrode plate 234 and the negative electrode plate 233, the phenomenon that the connecting member 30 is caught inside the electrode assembly 23 is avoided.

[0167] If there is no other separator body 231 in the separator roll 2000 at this time, the positive electrode plate 234 and the negative electrode plate 233 do not participate in winding in advance and wind independently with respect to the separator body 231, avoiding the situation where the length of the separator body 231 is insufficient to wind one electrode assembly 23, forming damage, and the electrode assembly 23 being discarded, thereby improving the yield.

[0168] In some embodiments, optionally, referring to FIG. 23, controlling the positive electrode plate 234 and the negative electrode plate 233 to stop winding specifically includes In A51, controlling the cutting member 7000 to cut the positive electrode plate 234 and controlling the cutting member 7000 to cut the negative electrode plate 233.

[0169] The cutting member 7000 is a blade, a rolling roller or another type of structure for providing a cutting action, and it is not destroyed by its own structure when cutting the positive electrode plate 234, the negative electrode plate 233 or the separator body 231.

[0170] The cutting member 7000 may be installed at a position close to the winding structure of the winding device 5000, and the negative electrode plate 233 and the positive electrode plate 234 wound around the winding mechanism may be separated from the negative electrode plate roll 3000 and the positive electrode plate roll 4000, whereby the winding of the positive electrode plate 234 and the negative electrode plate 233 can be stopped early.

[0171] In some embodiments, alternatively, referring to FIG. 24, after the separator roll 2000 is pulled and continuously wound a distance of at least a first preset length L1 and then the winding is stopped, In A60, it further includes controlling the cutting member 7000 to cut the separator body 231.

[0172] After the separator body 231 is wound alone by a certain distance, at this time, the connecting member 30 between the two separator bodies 231 has been peeled off from the separator roll 2000 and is not wound between the positive electrode plate 234 and the negative electrode plate 233. When controlling the cutting member 7000 to cut the separator body 231, the connecting member 30 is also cut off from the separator roll 2000, thereby avoiding the connecting member 30 affecting the winding of the next electrode assembly 23.

[0173] Furthermore, at this time, the negative electrode plate 233, the positive electrode plate 234, and the separator are all cut from the rolled material. After cutting off the separator body 231 at a certain distance of the final single winding in the separator body 231 at this time, the final electrode assembly 23 can be formed and package-shaped.

[0174] In some embodiments, optionally, each time the separator body 231 winds around the electrode assembly 23, the final single winding distance is smaller than the distance of the negative electrode plate 233 or the positive electrode plate 234 wound thereon each time the electrode assembly 23 is wound, whereby the connecting member 30 on the end b of the separator body 231 is cut off by the cutting member 7000, ensuring that it separates from the separator roll 2000, thereby not affecting the traction and winding of the separator body 231 when the electrode assembly 23 is wound next time.

[0175] In some embodiments, optionally, referring to FIG. 25, detecting whether an early warning coating 232 is installed on the separator body 231 specifically includes A41. providing the detection device 6000 in the transmission path where the separator body 231 is wound into the winding structure of the winding device 5000; and A42. the detection device 6000 detecting whether there is an early warning coating 232 on the separator body 231 at its facing position.

[0176] The transmission path is that the traction structure drives the separator body 231 to wind onto the traction path on the winding structure, and all separator bodies 231 are wound onto the winding structure through this transmission path to form the final electrode assembly 23.

[0177] The detection device 6000 is a sensor structure that converts an optical signal into an electrical signal. When the early warning coating 232 reaches the position facing the detection device 6000, at this time the sensor can sense the detection part and transmit an early warning signal to the outside. Whether this early warning signal is transmitted is used to control the positive electrode plate 234 and the negative electrode plate 233 to stop winding. Optionally, the detection device 6000 may also be a structure such as a color sensor or an infrared sensor.

[0178] In this way, by installing the detection device 6000 and combining it with the installation of the early warning coating 232, the early warning coating 232 can be identified.

[0179] In some embodiments, optionally, referring to FIG. 26, detecting whether there is an early warning coating 232 on the separator body 231 at its facing position by the detecting device specifically includes in A43, detecting whether there is a region on the separator body 231 that has a color difference from the separator body 231, and the RGB range value of the color difference is 1 - 225.

[0180] If there is a region with a color difference from the separator body 231, this region is the early warning coating 232. If there is no region with a color difference from the separator body 231, it indicates that no early warning coating 232 is installed on the separator body 231. The RGB value range of the color difference between the color difference of the separator body 231 and the early warning coating 232 is limited to 1 - 225, thereby ensuring that the color difference of the early warning coating 232 can be clearly distinguished from the separator body 231, and thereby being identified as generating an early warning effect.

[0181] In some embodiments, optionally, the RGB values of the color difference between the separator body 231 and the early warning coating 232 are in the range of 20 - 220.

[0182] Within this range, it is ensured that the color difference of the early warning coating 232 can be clearly distinguished from the separator body 231.

[0183] Regarding a specific embodiment, the surface of the separator body 231 can be controlled to be white, and the lower limit of the RGB value of the color of the early warning coating 232 can be set to (1, 176, 241) and the upper limit to (25, 38, 213).

[0184] In other embodiments, the surface of the separator body 231 can be set to any color, and the surface of the early warning coating 232 can be set to a color different from the surface of the separator body 231, and the present application does not limit this here.

[0185] In some embodiments, in addition to the color difference, parameters such as the hue, lightness, chroma, glossiness, and color difference of the surfaces of both the early warning coating 232 and the separator body 231 may also be different, so that the early warning coating 232 can be accurately and easily detected by an external detection device.

[0186] In the above embodiment, the method of detecting the early warning coating 232 on the separator body 231 by installing the detection device 6000 is similarly applicable to the positive electrode plate and the negative electrode plate, and the present application will not be further described herein.

[0187] According to another aspect of the present application, there is further provided manufacturing equipment for manufacturing the electrode assembly 23 described in any one of the above embodiments, including a winding device 5000 and a detection device 6000. The winding device 5000 is used to laminate and wind the positive electrode plate 234 on the positive electrode plate roll 4000, the separator body 231 on the separator roll 2000, and the negative electrode plate 233 on the negative electrode plate roll 3000. The detection device 6000 is located in the transmission path of the separator body 231 on the separator roll 2000, and the detection device 6000 is configured to detect whether the early warning coating 232 is installed on the separator body 231.

[0188] According to some embodiments of the present application, referring to FIGS. 5 to 7, the present application provides a separator roll 2000, a method for manufacturing a separator roll, and a method for manufacturing an electrode assembly. A plurality of separator bodies 231 connected end to end are wound around the separator roll 2000, and between adjacent separator bodies 231, they are adhered by a bonding adhesive. An early warning coating 232 is laid on each separator body 231. Thus, in the process of sequentially peeling and winding the separator body 231 from the separator roll 2000 to form the electrode assembly 23, the early warning coating 232 on each separator body 231 gives an early warning in advance with respect to the position of the bonding adhesive at its end b, avoiding the phenomenon of being wound inside the electrode assembly 23 due to the inability to determine the position of the bonding adhesive. As can be understood, the last separator body 231 can avoid the damage situation caused by the insufficient length of its end b when peeling the last separator body 231 and winding it inside the electrode assembly 23 by giving an early warning in advance about the position of its end b.

[0189] According to another aspect of the present application, a battery cell 20 is further provided, including a case 22 and an electrode assembly 23 manufactured by the method for manufacturing an electrode assembly in any one of the above embodiments and housed inside the case 22.

[0190] According to another aspect of the present application, a battery 100 including the battery cell 20 described in the above embodiment is further provided.

[0191] According to another aspect of the present application, an electric power consuming device including the battery 100 for supplying electric energy described in the above embodiment is further provided.

[0192] Each technical feature of the embodiments described above can be combined in any way. For the sake of brevity of description, not all possible combinations of all the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should all be regarded as within the scope described in this specification.

[0193] The above-described embodiments only show some embodiments of the present application. Although the description is more specific and detailed, it should not be understood as limiting the scope of the claims. It should be noted that those skilled in the art can make some further modifications and improvements on the premise of not departing from the concept of the present application, and all of these belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Description of Reference Numerals

[0194] 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, end cap; 211, electrode terminal; 22, case; 23, electrode assembly; 2000, separator roll; 231, separator body; a, tip; b, end; 232, early warning coating; 3000, negative electrode plate roll; 233, negative electrode plate; 4000, positive electrode plate roll; 234, positive electrode plate; 5000, winding device; 6000, detection device; 7000, cutting member; 30, connecting member; 40, supporting member; L1, first preset length; L2, second preset length; F1, longitudinal direction (winding direction); F2, width direction.

Claims

1. A method for manufacturing an electrode assembly, the method comprising: providing a roll material, the roll material including a positive electrode plate roll, a separator roll, and a negative electrode plate roll, wherein the separator roll includes a separator body and an early warning coating disposed on the separator body, the separator roll having a tip and a terminal formed at both ends along its winding direction, and the early warning coating being configured to be separated from the terminal by a first preset length; laminating and winding the positive electrode plate in the positive electrode plate roll, the separator body in the separator roll, and the negative electrode plate in the negative electrode plate roll; detecting whether the early warning coating is disposed on the separator body during the winding process. A method for manufacturing an electrode assembly including these steps.

2. After detecting whether the early warning coating is disposed on the separator body, if so, further comprising controlling the positive electrode plate and the negative electrode plate to stop winding, and pulling the separator roll to continue winding by a distance greater than the first preset length and then stopping winding. The method for manufacturing an electrode assembly according to Claim 1.

3. Controlling the positive electrode plate and the negative electrode plate to stop winding specifically includes: controlling a cutting member to cut the positive electrode plate; controlling the cutting member to cut the negative electrode plate. The method for manufacturing an electrode assembly according to Claim 2.

4. After pulling the separator roll to continue winding by a distance greater than the first preset length and then stopping winding, further comprising controlling a cutting member to cut the separator body. The method for manufacturing an electrode assembly according to Claim 2.

5. Detecting whether the early warning coating is disposed on the separator body specifically includes: providing a detection device in the transmission path of the separator roll; detecting whether the early warning coating is present on the separator body at the position directly opposite the detection device by the detection device. The method for manufacturing an electrode assembly according to Claim 1.

6. Detecting whether the early warning coating is present on the separator body at the position directly opposite the detection device by the detection device specifically includes: Whether there is a region on the separator body that has a color difference from the separator body and detecting that the RGB values of the color difference range between the separator body and the early warning coating are 1 - 225, the method for manufacturing an electrode assembly according to claim 5.

7. Detecting whether the early warning coating is present on the separator body at the facing position thereof by the detection device specifically Whether there is a region on the separator body that has a color difference from the separator body and detecting that the RGB values of the color difference range between the separator body and the early warning coating are 20 - 220, the method for manufacturing an electrode assembly according to claim 5.

8. Providing the separator roll specifically providing a plurality of separator bodies, each of the separator bodies having a tip and a terminal formed along its own longitudinal direction connecting the tips and terminals of every two of the separator bodies and winding the separator bodies along the longitudinal direction to form the separator roll, the method for manufacturing an electrode assembly according to claim 1.

9. After providing the plurality of separator bodies further including installing the early warning coating on each of the separator bodies, the method for manufacturing an electrode assembly according to claim 8.

10. Connecting the tips and terminals of every two of the separator bodies specifically includes connecting the tips and terminals of every two of the separator bodies via a connecting member, the method for manufacturing an electrode assembly according to claim 8.

11. Connecting the tips and terminals of every two of the separator bodies via the connecting member further includes adhering the tips and terminals of every two of the separator bodies by mixing one or more of polyethylene terephthalate, epoxy resin, polyurethane, unsaturated polyester resin, phenolic resin, polyacrylic acid resin, polyvinyl chloride resin, polysulfide rubber, silicone rubber, polyurethane rubber, chloroprene rubber, butyl rubber to form a bonding adhesive, the method for manufacturing an electrode assembly according to claim 10.

12. Installing the early warning coating on the separator body The method for manufacturing an electrode assembly according to claim 9, further comprising applying the early warning coating while extending along the longitudinal direction of the separator body and applying the early warning coating while extending along the width direction of the separator body.

13. Applying the early warning coating while extending along the longitudinal direction of the separator body means The method for manufacturing an electrode assembly according to claim 12, further comprising applying the early warning coating having a second preset length along the longitudinal direction of the separator body, wherein the range of the second preset length is 1 mm - 2000 mm.

14. Applying the early warning coating while extending along the longitudinal direction of the separator body means The method for manufacturing an electrode assembly according to claim 12, further comprising applying the early warning coating having a second preset length along the longitudinal direction of the separator body, wherein the range of the second preset length is 10 mm - 50 mm.

15. Applying the early warning coating while extending along the width direction of the separator body means The method for manufacturing an electrode assembly according to claim 12, further comprising applying the early warning coating along the width direction of the separator body until the distance range between both side edges of the early warning coating and both side edges of the separator body becomes 1 mm - 2000 mm.

16. Before installing the early warning coating on the separator body, The method for manufacturing an electrode assembly according to claim 9, further comprising providing the early warning coating, wherein the early warning coating is formed by mixing at least one or more of rubber, polyacrylic acid, polymethacrylic acid, methyl polyacrylate, ethyl polyacrylate, pure acrylic emulsion, polyacrylic acid - styrene copolymer, polyvinyl pyrrolidone, styrene butadiene rubber, epoxy resin, neopentyl glycol diacrylate, sodium polyacrylate series, fluorine-containing polyolefin series, etc.

17. Manufacturing equipment for manufacturing the electrode assembly according to any one of claims 1 to 16, wherein the manufacturing equipment A winding device for laminating and winding the positive electrode plate in the positive electrode plate roll, the separator body in the separator roll, and the negative electrode plate in the negative electrode plate roll, and A manufacturing apparatus including a detection device configured to detect whether or not the early warning coating is installed on the separator body, the detection device being located in a transmission path of the separator body in the separator roll.

18. A battery cell, comprising a case and an electrode assembly manufactured by the method for manufacturing an electrode assembly according to any one of claims 1 to 16, the electrode assembly being housed in the case.

19. A battery, comprising the battery cell according to claim 18.

20. An electric power consuming device, comprising the battery according to claim 19, the battery being used to provide electric energy.

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