Electrode assembly and manufacturing method thereof, battery cell, battery and device

Abstract

The invention discloses a pole assembly and a manufacturing method thereof, a battery monomer, a battery, electric equipment and production equipment. The manufacturing method comprises the following steps: providing a first pole piece; fixing the end part of the first pole piece and the diaphragm through a connector and forming a layer assembly; a second pole piece and the layer assembly are jointly wound to obtain the electrode assembly, the second pole piece is located on the side, away from the first pole piece, of the diaphragm, and the polarity of the second pole piece is opposite to that of the first pole piece. According to the manufacturing method of the embodiment of the invention, the end part of the first pole piece and the diaphragm are fixed through the connecting body to form the layer assembly; the second pole piece and the layer assembly are jointly wound to obtain the electrode assembly, so that at least one of the first pole piece and the second pole piece cannot slip relative to the diaphragm, the first pole piece and the second pole piece are difficult to generate a short circuit phenomenon, and a relatively long diaphragm does not need to be arranged at the starting end and / or the ending end of the electrode assembly; the utilization rate of the diaphragm material is improved, and the material waste of the diaphragm is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an electrode assembly, a battery cell, a battery, an electrical device and a production device. Background Art

[0002] With the development of the battery industry, batteries are being used more and more widely, and battery safety issues have attracted attention. In the relevant technology, a battery cell includes an electrode assembly, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a diaphragm, and the diaphragm separates the positive electrode sheet from the negative electrode sheet. In order to reduce the probability of the positive electrode sheet and the negative electrode sheet slipping relative to the diaphragm and connecting to short-circuit, the length of the diaphragm is generally longer to cover the positive electrode sheet and the negative electrode sheet. However, a longer diaphragm causes material waste. Summary of the invention

[0003] The present application provides an electrode assembly and a manufacturing method thereof, a battery cell, a battery, an electrical device and a production equipment, which can solve the problem of material waste caused by a long diaphragm of the electrode assembly.

[0004] The manufacturing method of the embodiment of the present application is used for an electrode assembly, and the manufacturing method comprises:

[0005] Providing a first pole piece;

[0006] Fixing the end of the first pole piece and the diaphragm through a connector to form a layer assembly;

[0007] The second pole sheet is wound together with the layer assembly to obtain the electrode assembly, wherein the second pole sheet is located on a side of the diaphragm away from the first pole sheet, and the second pole sheet and the first pole sheet have opposite polarities.

[0008] In the manufacturing method of the embodiment of the present application, the end of the first pole piece is fixed to the diaphragm through a connector to form a layer assembly; the second pole piece and the layer assembly are wound together to obtain the electrode assembly, so that at least one of the first pole piece and the second pole piece will not slip relative to the diaphragm, and it is difficult for the first pole piece and the second pole piece to short-circuit, and there is no need to set a longer diaphragm at the starting end and / or the ending end of the electrode assembly, thereby improving the utilization rate of the diaphragm material and reducing the material waste of the diaphragm.

[0009] In some embodiments, the step of fixing the end of the first pole piece to the diaphragm through a connector to form a layer assembly includes:

[0010] The two ends of the first pole piece in the length direction are fixed to the diaphragm through the connector to form the layer assembly.

[0011] In this way, both ends of the first pole piece in the length direction are fixed to the diaphragm, so that the first pole piece as a whole is relatively fixed to the diaphragm, and the risk of the first pole piece slipping relative to the diaphragm during the winding process is relatively small.

[0012] In some embodiments, the connector includes a colloid, and the step of fixing the end of the first pole piece and the diaphragm through the connector to form a layer assembly includes:

[0013] The colloid is arranged at the end of the first pole piece;

[0014] The diaphragm is disposed on the first pole piece and bonded to the colloid.

[0015] Thus, the colloid is easy to obtain, so that the manufacturing cost of the electrode assembly is low. In addition, the colloid is viscous, which can make the connection between the first electrode plate and the diaphragm more stable.

[0016] In some embodiments, the colloid is provided at the end of the first pole piece, comprising:

[0017] The colloid is arranged on both sides of the first pole piece in the thickness direction;

[0018] The step of arranging the diaphragm on the first pole piece and bonding it to the colloid comprises:

[0019] Disposing a first diaphragm on a first surface in a thickness direction of the first pole piece and bonding the diaphragm to the colloid;

[0020] A second diaphragm is arranged on a second surface of the first pole piece in a thickness direction and bonded to the colloid, wherein the diaphragm includes the first diaphragm and the second diaphragm.

[0021] In this way, the diaphragm has a larger surface area in the thickness direction of the diaphragm, so the bonding area of ​​the colloid is larger, which is conducive to the colloid to more stably bond the electrode piece and the diaphragm. In addition, the first electrode piece is sandwiched between the first diaphragm and the second diaphragm, so that the first electrode piece and the second electrode piece will not contact each other during the winding process.

[0022] In some embodiments, providing a first pole piece includes:

[0023] Providing a pole piece raw material;

[0024] The pole piece raw material is cut to form the first pole piece.

[0025] In this way, the first pole piece is formed by cutting the pole piece raw material, and the production efficiency is high.

[0026] In some embodiments, the pole piece material is formed with a plurality of thinning regions, and the step of cutting the pole piece material to form the first pole piece includes:

[0027] The pole piece material is cut off from the position of the thinning area to form the first pole piece, so that the thickness of the end of the first pole piece is smaller than the thickness of the middle position of the first pole piece.

[0028] In this way, the colloid is disposed at the end of the first electrode sheet with a smaller thickness, so that the surfaces of the starting end and the ending end of the winding of the electrode assembly are smoother, thereby reducing the probability of interference between the electrode assembly and other components.

[0029] An electrode assembly, the electrode assembly is manufactured by the manufacturing method described in any of the above embodiments; the electrode assembly comprises:

[0030] First pole piece;

[0031] a second pole piece, the second pole piece being stacked with the first pole piece along a thickness direction of the first pole piece, and the second pole piece and the first pole piece have opposite polarities;

[0032] A diaphragm, the diaphragm isolating the first pole piece from the second pole piece and is stacked with the first pole piece along a thickness direction of the first pole piece;

[0033] Wherein, at the starting end and / or the ending end of the winding of the electrode assembly, at least one of the first pole sheet and the second pole sheet is fixed to the diaphragm via a connector.

[0034] The battery cell according to the embodiment of the present application includes the electrode assembly according to any one of the above embodiments.

[0035] The battery according to the embodiment of the present application includes the battery cell described in any one of the above embodiments.

[0036] The electrical equipment of the embodiment of the present application includes the battery cell described in any of the above embodiments or the battery described in the above embodiments.

[0037] The production equipment of the embodiment of the present application includes:

[0038] A first conveying device, used for conveying a first pole piece;

[0039] A fixing device, used to fix the end of the first pole piece and the diaphragm through a connector to form a layer assembly;

[0040] A winding device is used to wind a second pole piece together with the layer assembly to obtain the electrode assembly, wherein the second pole piece is located on a side of the diaphragm away from the first pole piece, and the second pole piece and the first pole piece have opposite polarities.

[0041] In this way, the fixing device fixes the end of the first pole piece and the diaphragm through the connector to form a layer assembly; the winding device winds the second pole piece and the layer assembly together to obtain the electrode assembly, so that at least one of the first pole piece and the second pole piece will not slip relative to the diaphragm, and the first pole piece and the second pole piece are unlikely to short-circuit, and there is no need to set a longer diaphragm at the starting end and / or the ending end of the electrode assembly, thereby improving the utilization rate of the diaphragm material and reducing the material waste of the diaphragm.

[0042] In certain embodiments, the fixing device is used to fix the two ends of the first pole piece in the length direction to the diaphragm through the connector to form the layer assembly.

[0043] In this way, both ends of the first pole piece in the length direction are fixed to the diaphragm, so that the first pole piece as a whole is relatively fixed to the diaphragm, and the risk of the first pole piece slipping relative to the diaphragm during the winding process is relatively small.

[0044] In some embodiments, the connector includes a colloid, and the production equipment includes a gluing device arranged between the first conveying device and the fixing device, the gluing device is used to set the colloid on the end of the first pole piece, and the fixing device is used to set the diaphragm on the first pole piece and bond it to the colloid.

[0045] Thus, the colloid is easy to obtain, so that the manufacturing cost of the electrode assembly is low. In addition, the colloid is viscous, which can make the connection between the first electrode plate and the diaphragm more stable.

[0046] In some embodiments, the gluing device includes an adsorption mechanism and a gluing mechanism arranged on one side of the adsorption mechanism, the adsorption mechanism is used to adsorb the first pole piece, the gluing mechanism can move relative to the adsorption mechanism and transfer the colloid on the gluing mechanism to the end of the first pole piece.

[0047] In this way, the adsorption mechanism and the glue sticking mechanism cooperate with each other to accurately place the colloid on the end of the first pole piece.

[0048] In some embodiments, the adsorption mechanism is formed with an adsorption hole, and the adsorption hole can form a negative pressure to adsorb the first pole piece.

[0049] In this way, the adsorption mechanism utilizes negative pressure to adsorb the first pole piece, and the adsorption process is easy to control, which is beneficial to the transportation of the first pole piece and the setting of the colloid on the first pole piece.

[0050] In some embodiments, the adsorption mechanism includes a conveyor belt, and the glue mechanism includes a first glue component and a second glue component, the first glue component and the second glue component are respectively arranged on opposite sides of the conveyor belt, the first glue component is used to set the first colloid on the first side of the conveyor belt, and the rotation of the conveyor belt drives the first colloid located on the first side of the conveyor belt to the second side of the conveyor belt, so that the first colloid located on the second side of the conveyor belt is bonded to the first surface of the first pole piece moved from the first conveying device, and the second glue component is used to set the second colloid on the second surface of the first pole piece moved from the first conveying device, and the first surface and the second surface of the first pole piece are arranged opposite to each other along the thickness direction of the first pole piece.

[0051] In this way, the colloid is disposed on both the first surface and the second surface of the first pole piece, so that the first pole piece can be sandwiched between the two diaphragms and bonded to the diaphragms, which is conducive to the colloid bonding the pole piece and the diaphragm more stably. In addition, the first pole piece is sandwiched between the first diaphragm and the second diaphragm, so that the first pole piece and the second pole piece will not contact each other during the winding process.

[0052] In some embodiments, the fixing device includes a composite roller group, which includes two composite rollers arranged opposite to each other, and the two composite rollers roll the first pole piece with the colloid and the diaphragm to make the diaphragm be arranged on the first pole piece and bonded to the colloid.

[0053] In this way, the first pole piece and the diaphragm are rolled and fixed together by the composite roller group, so that the production efficiency of the first pole piece and the diaphragm is relatively high.

[0054] In certain embodiments, the production apparatus comprises a second conveying device disposed between the fixing device and the winding device, the second conveying device being used to convey the layer assembly to the winding device.

[0055] In this way, the second conveying device can keep the shape of the layer assembly stable, which is conducive to the winding device winding the layer assembly and the second pole piece together.

[0056] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0058] Figure 1 It is a schematic diagram of the structure of the electrical equipment provided by some embodiments of the present application;

[0059] Figure 2 is a schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0060] Figure 3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0061] Figure 4 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0062] Figure 5 yes Figure 4 An enlarged schematic diagram of part A of the electrode assembly;

[0063] Figure 6 It is a schematic diagram of the coordination between the electrode and the colloid provided in some embodiments of the present application;

[0064] Figure 7 is a structural stereogram of an electrode assembly provided in some embodiments of the present application;

[0065] Figure 8 yes Figure 7 An enlarged schematic diagram of part B of the electrode assembly;

[0066] Fig. 9 is a structural stereogram of an electrode assembly provided in some embodiments of the present application;

[0067] Fig.10 yes Fig. 9 An enlarged schematic diagram of part C of the electrode assembly;

[0068] Fig.11 is a schematic diagram of a process of manufacturing an electrode assembly provided in some embodiments of the present application;

[0069] Fig.12 is a schematic flow chart of a method for manufacturing an electrode assembly provided in some embodiments of the present application;

[0070] Fig.13 is a schematic flow chart of a method for manufacturing an electrode assembly provided in some embodiments of the present application;

[0071] Fig.14 is a schematic flow chart of a method for manufacturing an electrode assembly provided in some embodiments of the present application;

[0072] Fig.15 is a schematic flow chart of a method for manufacturing an electrode assembly provided in some embodiments of the present application;

[0073] Fig.16 is a schematic diagram of a process of manufacturing an electrode assembly provided in some embodiments of the present application;

[0074] Fig.17It is a schematic diagram of the structure of production equipment provided by some embodiments of the present application;

[0075] Fig.18 is a schematic diagram of the structure of a glue sticking device provided in some embodiments of the present application;

[0076] Fig.19 is a schematic diagram of the structure of a glue sticking device provided in some embodiments of the present application;

[0077] Fig. 20 It is a schematic diagram of the cooperation between the fixing device and the second conveying device provided in some embodiments of the present application.

[0078] Description of reference numerals:

[0079] 1000-electrical equipment, 200-battery, 300-controller, 400-motor, 100-battery cell, 10-housing, 20-electrode assembly, 21-first pole piece, 211-current collector, 212-coating layer, 213-groove, 214-pole piece material, 2141-thinning area, 22-second pole piece, 23-diaphragm, 231-first diaphragm, 232-second diaphragm, 201-starting end, 202-ending end, 24-connector, 241-colloid, 2411-first glue body, 2412-second colloid, 203-layer assembly, 500-production equipment, 510-first conveying device, 511-first conveying roller, 520-fixing device, 521-composite roller group, composite roller 5211, 530-winding device, 540-gluing device, 541-adsorption mechanism, 5411-adsorption hole, 5412-conveyor belt, 542-gluing mechanism, 5421-first glue sticking component, 5422-second glue sticking component, 550-second conveying device, 551-second conveying roller. DETAILED DESCRIPTION

[0080] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0082] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0083] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0084] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0085] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0086] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0087] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0088] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of battery application fields, LPI231261

[0089] The market demand is also constantly expanding.

[0090] The battery cell includes an electrode assembly, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly can be wound into one body. During the winding process of the electrode assembly, at the starting end and the first and last ends of the winding of the electrode assembly, at least one of the positive electrode sheet and the negative electrode sheet is easy to slide relative to the separator, so that the positive electrode sheet and the negative electrode sheet exceed the edge of the separator and short-circuit. In order to reduce the probability of the positive electrode sheet and the negative electrode sheet sliding relative to the separator and short-circuiting, the separator is generally set to a longer length than the edge of the electrode sheet at the starting end and the first and last ends of the winding, so that even if at least one of the positive electrode sheet and the negative electrode sheet is easy to slide relative to the separator, the positive electrode sheet and the negative electrode sheet will not exceed the edge of the separator. However, a longer separator length is likely to cause material waste.

[0091] In order to solve the problem that the diaphragm is too long and easily causes material waste, at the starting end and / or the ending end of the winding of the electrode assembly, at least one of the first pole piece and the second pole piece is fixed to the diaphragm through a connector, so that at least one of the first pole piece and the second pole piece will not slip relative to the diaphragm, and the first pole piece and the second pole piece are unlikely to short-circuit, thereby eliminating the need to set a longer diaphragm at the starting end and / or the ending end of the electrode assembly, thereby improving the utilization rate of the diaphragm material and reducing the material waste of the diaphragm.

[0092] It should be noted that in the present application, "pole piece" may refer to the first pole piece or the second pole piece. One of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece.

[0093] The electric device of the embodiment of the present application includes a battery cell or a battery in any of the following embodiments. Specifically, the electric device can use a battery or a battery cell as a power source, and the electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0094] For the convenience of explanation, the following embodiments take an electric device 1000 according to an implementation mode of the present application as a vehicle as an example for explanation.

[0095] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of the structure of the power-consuming device 1000 provided in some embodiments of the present application. A battery 200 is arranged inside the vehicle, and the battery 200 can be arranged at the bottom, head or tail of the vehicle. The battery 200 can be used to power the vehicle, for example, the battery 200 can be used as an operating power source for the vehicle.

[0096] The vehicle may further include a controller 300 and a motor 400 , wherein the controller 300 is used to control the battery 200 to supply power to the motor 400 , for example, to meet the power requirements for starting, navigating, and driving the vehicle.

[0097] In the embodiment of the present application, the battery 200 can not only be used as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0098] Please refer to Figure 2 , Figure 2 2 is a schematic diagram of the structure of a battery 200 provided in some embodiments of the present application. The battery 200 of the embodiment of the present application includes a battery cell 100 of any of the following embodiments. In this way, since the electrode assembly can be effectively wetted in the battery cell and the function of the insulating film will not be greatly affected, the battery of the embodiment LPI231261 of the present application has good performance and can operate continuously and stably in a safe environment.

[0099] In the embodiment of the present application, the battery cell 100 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., and the embodiment of the present application is not limited to this. The battery cell 100 may be cylindrical, flat, rectangular or other shapes, etc., and the embodiment of the present application is not limited to this. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiment of the present application is not limited to this.

[0100] The battery 200 generally includes a battery case 201 for encapsulating one or more battery cells 100. Multiple batteries can be accommodated in the battery case 201, and the battery case 201 can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 100. As a carrier of the battery module, the battery case 201 plays a key role in the safe operation and protection of the battery module. The battery case 201 must meet the strength and stiffness requirements and the protection level requirements of the electrical equipment housing, while providing collision protection. The shape of the battery case 201 can be a rectangular parallelepiped, a cube, etc. The battery case 201 can be cast with materials such as steel plates and aluminum alloys; it can also be made of new lightweight materials, such as glass fiber reinforced composite materials, carbon fiber reinforced composite materials, etc.

[0101] See also Figure 3 , Figure 3 1 is a disassembled diagram of a battery cell 100 provided in some embodiments of the present application. In some embodiments, the battery cell 100 includes a housing 10 and an electrode assembly 20 , wherein the electrode assembly 20 is disposed in the housing 10 .

[0102] The electrode assembly 20 is a component where an electrochemical reaction occurs in the battery cell 100. One or more electrode assemblies 20 may be contained in the housing 10 of the battery cell 100.

[0103] See also Figure 4 and Figure 5 , Figure 4 It is a schematic diagram of the structure of the electrode assembly 20 provided in some embodiments of the present application. Figure 5 yes Figure 4 The electrode assembly 20 of the embodiment of the present application includes a first pole piece 21, a second pole piece 22 and a diaphragm 23. The second pole piece 22 is stacked with the first pole piece 21 along the thickness direction of the first pole piece 21, and the second pole piece 22 and the first pole piece 21 have opposite polarities. The diaphragm 23 isolates the first pole piece 21 from the second pole piece 22, and is stacked with the first pole piece 21 along the thickness direction of the first pole piece 21.

[0104] The diaphragm 23 , the first pole piece 21 and the second pole piece 22 are wound together into one body. At the starting end 201 and / or the ending end 202 of the electrode assembly 20 , at least one of the first pole piece 21 and the second pole piece 22 is fixed to the diaphragm 23 via a connector 24 .

[0105] Specifically, the first pole piece 21 and the second pole piece 22 are two pole pieces with opposite polarities. During the charge and discharge process of the battery cell 100, the positive electrode active material and the negative electrode active material may react with the electrolyte.

[0106] The diaphragm 23 isolates the first pole piece 21 and the second pole piece 22, that is, the diaphragm 23 is arranged between the first pole piece 21 and the second pole piece 22, the first pole piece 21 and the second pole piece 22 are spaced from each other and do not contact each other, thereby reducing the risk of short circuit between the first pole piece 21 and the second pole piece 22.

[0107] The first pole piece 21, the second pole piece 22 and the diaphragm 23 are stacked on each other in their respective thickness directions. The diaphragm 23, the first pole piece 21 and the second pole piece 22 are wound into a cylindrical shape, or can be wound into a substantially square shape.

[0108] In one example, at the starting end 201 of the winding of the electrode assembly 20 , at least one of the first electrode sheet 21 and the second electrode sheet 22 is fixed to the diaphragm 23 via a connector 24 .

[0109] In another example, at the winding end 202 of the electrode assembly 20 , at least one of the first electrode sheet 21 and the second electrode sheet 22 is fixed to the diaphragm 23 via a connector 24 .

[0110] In another example, at least one of the first electrode sheet 21 and the second electrode sheet 22 at the starting end 201 and the ending end 202 of the electrode assembly 20 is fixed to the separator 23 via a connector 24 .

[0111] In this way, at the starting end 201 and / or the ending end 202 of the winding of the electrode assembly 20, at least one of the first pole piece 21 and the second pole piece 22 is fixed to the diaphragm 23 through the connector 24, so that at least one of the first pole piece 21 and the second pole piece 22 will not slip relative to the diaphragm 23, and it is difficult for the first pole piece and the second pole piece 22 to short-circuit. There is no need to set a longer diaphragm 23 at the starting end 201 and / or the ending end 202 of the electrode assembly 20, which improves the utilization rate of the diaphragm 23 material and reduces the material waste of the diaphragm 23.

[0112] In some embodiments, the connector 24 includes a colloid 241 , and at least one of the first pole piece 21 and the second pole piece 22 is fixed to the diaphragm 23 via the colloid 241 .

[0113] Specifically, the colloid 241 is, for example, a double-sided adhesive, a liquid cured adhesive, or the like. The colloid 241 can be made of epoxy resin, phenolic resin, urea-formaldehyde resin, polyurethane, or the like. It should be noted that the colloid 241 can have a certain elasticity so that the colloid 241 will not damage the pole piece and the diaphragm 23.

[0114] In one example, the colloid 241 bonds the first pole piece 21 and the diaphragm 23 . In another example, the colloid 241 bonds the second pole piece 22 and the diaphragm 23 . In yet another example, both the first pole piece 21 and the second pole piece 22 are bonded and fixed to the diaphragm 23 by the colloid 241 .

[0115] Thus, the colloid 241 is easy to obtain, so that the manufacturing cost of the electrode assembly 20 is low. In addition, the colloid 241 is viscous, which can make the connection between the electrode plate and the diaphragm 23 more stable.

[0116] In other embodiments, the connector 24 may include components such as pins, which may pass through the pole piece and the diaphragm 23 to fix the pole piece and the diaphragm 23 together.

[0117] In some embodiments, the colloid 241 bonds the first pole piece 21 and the diaphragm 23 along the thickness direction of the diaphragm 23 , and / or the colloid 241 bonds the second pole piece 22 and the diaphragm 23 along the thickness direction of the diaphragm 23 .

[0118] It can be understood that the diaphragm 23 has a larger surface area in the thickness direction of the diaphragm 23 , and therefore the bonding area of ​​the colloid 241 is larger, which is conducive to the colloid 241 to bond the electrode and the diaphragm 23 more stably.

[0119] In one example, when the diaphragm 23 and the first pole piece 21 are bonded by the colloid 241, the colloid 241 bonds the first pole piece 21 and the diaphragm 23 along the thickness direction of the diaphragm 23. In another example, when the diaphragm 23 and the second pole piece 22 are bonded by the colloid 241, the colloid 241 bonds the second pole piece 22 and the diaphragm 23 along the thickness direction of the diaphragm 23.

[0120] See also Figure 6 In some embodiments, the colloid 241 is symmetrically arranged about the center of the width direction of the electrode piece bonded to the diaphragm 23. In one example, when the diaphragm 23 and the first electrode piece 21 are bonded by the colloid 241, the colloid 241 is symmetrically arranged about the center of the width direction of the first electrode piece 21. In another example, when the diaphragm 23 and the second electrode piece 22 are bonded by the colloid 241, the colloid 241 is symmetrically arranged about the center of the width direction of the second electrode piece 22.

[0121] The width direction of the electrode sheet is a direction perpendicular to the thickness direction of the electrode sheet, and the length direction of the electrode sheet is perpendicular to the width direction of the electrode sheet. Generally, the electrode assembly 20 is wound along the length direction of the electrode sheet. Therefore, at the starting end 201 or the first and last ends of the winding of the electrode assembly 20, the width of the electrode sheet is in an expanded state.

[0122] In this way, the colloid 241 extends from the center of the electrode in the width direction to the two edges, so that the bonding force between the diaphragm 23 and the electrode is more uniform, which is conducive to more stable bonding of the electrode and the diaphragm 23.

[0123] It should be noted that, on the same surface of the diaphragm 23 , the colloid 241 may extend continuously along the width direction of the diaphragm 23 , or may be distributed discontinuously along the width direction of the diaphragm 23 .

[0124] Of course, in other embodiments, the colloid 241 can be glued to the long edge of the electrode piece and the diaphragm 23 .

[0125] In some embodiments, the width of the colloid 241 is a first width W1, the width of the pole piece bonded to the diaphragm 23 is a second width W2, and the ratio of the first width W1 to the second width W2 is in the range of 0.5-1 (0.5≤W1 / W2≤1). For example, the ratio W1 / W2 of the first width W1 to the second width W2 may be 0.5, 0.6, 0.7, 0.8, 0.9 or 1. In this way, the colloid 241 occupies a larger width position of the pole piece, and the width of the colloid 241 bonding the diaphragm 23 and the pole piece is larger, which is conducive to the colloid 241 stably bonding the pole piece and the diaphragm 23.

[0126] In one example, the ratio of the width of the colloid 241 to the width of the first pole piece 21 is in the range of 0.5-1. In another example, the ratio of the width of the colloid 241 to the width of the second pole piece 22 is in the range of 0.5-1.

[0127] It should be noted that, when there are multiple colloids 241 , the ratio ranges of the widths of different colloids 241 to the width of the electrode piece may be the same or different.

[0128] See also Figure 5 In some embodiments, along the length direction of the pole piece bonded to the diaphragm 23, the length of the colloid 241 ranges from 2 mm to 100 mm (0.5 ≤ L ≤ 1). For example, the length L of the colloid 241 can be 2 mm, 10 mm, 20 mm, 50 mm, 80 mm, 100 mm, etc. As discussed above, the pole piece is wound along its own length direction. Therefore, if the colloid 241 is rolled into a curved state, the length of the colloid 241 is the size in the flat state.

[0129] Thus, when the length L of the colloid 241 is within the above range, the adhesive force formed by the colloid 241 can stably bond the electrode and the diaphragm 23 , and the area of ​​the diaphragm 23 blocked is small, which has little effect on the chemical reaction between the first electrode 21 and the second electrode 22 .

[0130] It should be noted that, when there are multiple colloids 241 , the lengths of different colloids 241 may be the same or different.

[0131] See also Figure 5 In some embodiments, the thickness H of the colloid 241 is less than 20 μm. For example, the thickness H of the colloid 241 can be 19 μm, 15 μm, 10 μm, 8 μm, 5 μm, etc. In this way, when the adhesive force of the colloid 241 is sufficient, the thickness of the colloid 241 is small, which has little effect on the air permeability of the diaphragm 23, and thus has little effect on the chemical reaction between the first pole piece 21 and the second pole piece 22. In addition, the thickness of the colloid 241 also has little effect on the deformation degree of the pole piece or the diaphragm 23, so that the electrode assembly 20 can be used normally.

[0132] In some embodiments, the pole piece bonded to the diaphragm 23 includes a current collector 211 and a coating layer 212, the coating layer 212 is stacked on the current collector 211, and the starting end and / or the ending end of the coating layer 212 is wound to form a groove 213 away from the current collector 211, and the colloid 241 is at least partially accommodated in the groove 213.

[0133] Specifically, the groove 213 may be a groove 213 in the shape of a rectangular groove 213, an arc groove 213, etc. The groove 213 may connect the length edge and the width edge of the coating layer 212. The depth of the groove 213 may be 0.3-0.8 times the thickness of the coating layer 212. When the depth of the groove 213 is sufficient, the colloid 241 may be completely accommodated in the groove 213.

[0134] In summary, the colloid 241 is at least partially accommodated in the groove 213, so that the surfaces of the starting end 201 and the ending end 202 of the electrode assembly 20 are relatively flat, thereby reducing the probability of interference between the electrode assembly 20 and other components.

[0135] See also Figure 7 and Figure 8 In some embodiments, the groove may be omitted. In this case, the colloid 241 may cause the diaphragm 23 to bulge slightly, but such bulge will not affect the normal use of the electrode assembly 20 .

[0136] In some embodiments, there are two diaphragms 23, and one of the first pole piece 21 and the second pole piece 22 is clamped between the two diaphragms 23. At the starting end 201 and / or the ending end 202 of the winding of the electrode assembly 20, the two diaphragms 23 are fixed to the clamped pole piece through a connector 24.

[0137] In one example, the first pole piece 21 is sandwiched between two separators 23, and at the starting end 201 and the ending end 202 of the electrode assembly 20, the two separators 23 are fixed to the first pole piece 21 by the colloid 241. In another example, the second pole piece 22 is sandwiched between the two separators 23, and at the starting end 201 and the ending end 202 of the electrode assembly 20, the two separators 23 are fixed to the second pole piece 22 by the colloid 241.

[0138] In this way, the two diaphragms 23 are fixed to the clamped pole piece through the connector 24, which can further stabilize the relative position of the clamped pole piece and the diaphragm 23 and reduce the risk of short-circuiting between the first pole piece 21 and the second pole piece 22.

[0139] See also Fig. 9 and Fig.10 In some embodiments, the electrode assembly 20 includes a tape 25 , and at the starting end 201 and / or the ending end 202 of the electrode assembly 20 , another electrode sheet other than the clamped electrode sheet is connected to an adjacent separator through the tape 25 .

[0140] In one example, the first pole piece 21 is sandwiched between two diaphragms 23. At the starting end 201 and the ending end 202 of the electrode assembly 20, the two diaphragms 23 are fixed to the first pole piece 21 by a colloid 241. One end of the tape 25 is bonded to the end of the second pole piece 22, and the other end is connected to the end of the adjacent diaphragm 23.

[0141] It can be understood that in the first pole piece 21 and the second pole piece 22, the orthographic projection of one pole piece on the other pole piece is completely within the contour of the other pole piece, so that the lithium ions can be completely attached to the other pole piece during the flow. Therefore, the relative positions of the two pole pieces are extremely important.

[0142] Illustratively, during the manufacturing process of the electrode assembly 200, the first electrode sheet 21, the second electrode sheet 22 and the two diaphragms 23 can be flattened first, and the corresponding winding ends and the tail ends can be fixed first, and then wound, so that the first electrode sheet 21, the second electrode sheet 22 and the two diaphragms 23 will not be positionally shifted during the winding process, thereby improving the pass rate of the electrode assembly 20.

[0143] In this way, the position of another pole piece other than the clamped pole piece can be fixed, so that the positions of the two pole pieces are accurate, the lithium deposition phenomenon of the electrode assembly 20 is reduced, and the safety of the electrode assembly 20 is improved.

[0144] See also Fig.10In some embodiments, along the winding path of the electrode assembly 20, the connection length of the tape 25 and the electrode piece ranges from 3 mm to 20 mm. For example, the connection length C1 of the tape 25 and the electrode piece is 3 mm, 5 mm, 12 mm, 16 mm, 20 mm, etc. In this way, the connection between the tape 25 and the electrode piece is relatively stable.

[0145] See also Fig.10 In some embodiments, along the winding path of the electrode assembly 20, the connection length of the tape 25 and the separator 23 ranges from 3 mm to 40 mm. For example, the connection length C2 of the tape 25 and the electrode sheet is 3 mm, 15 mm, 20 mm, 30 mm, 40 mm, etc. In this way, the connection between the tape 25 and the separator 23 is relatively stable.

[0146] In some embodiments, the tape 25 is embedded in a depression formed on the surface of the diaphragm 23, so that the structure of the tape 25 and the diaphragm 23 is more compact.

[0147] In some embodiments, the thickness of the tape 25 ranges from 0.02 mm to 0.1 mm. For example, the thickness of the tape 25 ranges from 0.02 mm, 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, etc. In this way, the tape 25 has sufficient strength, is not easy to break, and occupies a small space, thereby improving the energy density of the battery cell 100.

[0148] See also Fig.11 and Fig.12 The manufacturing method of the embodiment of the present application is used for the electrode assembly 20, and the manufacturing method includes:

[0149] S10, providing a first pole piece 21;

[0150] S20, fixing the end of the first pole piece 21 and the diaphragm 23 via the connector 24 to form a layer assembly 203;

[0151] S30, winding the second pole piece 22 and the layer assembly 203 together to obtain the electrode assembly 20, the second pole piece 22 is located on the side of the diaphragm 23 away from the first pole piece 21, and the second pole piece 22 and the first pole piece 21 have opposite polarities.

[0152] Specifically, in step S20, the number of the separators 23 may be two, and the first pole piece 21 is sandwiched between the two separators 23. The layer assembly 203 is in a flattened state. The first pole piece 21 and the separator 23 are stacked with each other along the thickness direction of the layer assembly 203. In step S30, in one example, the second pole piece 22 and the layer assembly 203 may be stacked in a flattened state first, and then wound together to form the electrode assembly 20; in another example, the second pole piece 22 and the layer assembly 203 may also be compounded together while being wound.

[0153] In the manufacturing method of the embodiment of the present application, the end of the first pole piece 21 is fixed to the diaphragm 23 through the connector 24 to form a layer assembly 203; the second pole piece 22 and the layer assembly 203 are wound together to obtain the electrode assembly 20, so that at least one of the first pole piece 21 and the second pole piece 22 will not slip relative to the diaphragm 23, and the first pole piece 21 and the second pole piece 22 are unlikely to short-circuit, and there is no need to set a longer diaphragm 23 at the starting end 201 and / or the ending end 202 of the electrode assembly 20, thereby improving the utilization rate of the diaphragm material and reducing the material waste of the diaphragm.

[0154] In some embodiments, the end of the first pole piece 21 is fixed to the diaphragm 23 through a connector 24 to form a layer assembly 203 (S20), including:

[0155] The two ends of the first pole piece 21 in the length direction are fixed to the diaphragm 23 through the connector 24 to form a layer assembly 203 .

[0156] Specifically, as discussed above, the first pole piece 21 and the diaphragm 23 are stacked, and the first pole piece 21 and the diaphragm 23 are wound along the length direction during the winding process. Therefore, both ends of the first pole piece 21 in the length direction are fixed to the diaphragm 23, so that the first pole piece 21 as a whole is relatively fixed to the diaphragm 23, and the risk of the first pole piece 21 slipping relative to the diaphragm 23 during the winding process is relatively small.

[0157] See also Fig.11 and Fig.13 In some embodiments, the connector 24 includes a colloid 241, and the end of the first pole piece 21 and the diaphragm 23 are fixed to form a layer assembly 203 (S20) through the connector 24, including:

[0158] S21, disposing a colloid 241 at an end of the first pole piece 21;

[0159] S22 , disposing the diaphragm 23 on the first electrode sheet 21 and bonding it to the colloid 241 .

[0160] Specifically, the colloid 241 is, for example, a double-sided adhesive, a glue formed after liquid solidification, etc. The colloid 241 can be made of epoxy resin, phenolic resin, urea-formaldehyde resin, polyurethane, etc. It should be noted that the colloid can have a certain elasticity so that the colloid 241 will not damage the first pole piece 21 and the diaphragm 23.

[0161] Thus, the colloid 241 is easy to obtain, so that the manufacturing cost of the electrode assembly 20 is low. In addition, the colloid 241 is viscous, which can make the connection between the first electrode plate 21 and the diaphragm 23 more stable.

[0162] See also Fig.11 and Fig.14In some embodiments, a colloid 241 (S21) is provided at the end of the first pole piece 21, including:

[0163] S211, colloid 241 is disposed on both sides of the first pole piece 21 in the thickness direction;

[0164] The diaphragm 23 is disposed on the first pole piece 21 and bonded to the colloid 241 (S22), including:

[0165] S221 , disposing the first diaphragm 231 on the first surface of the first electrode sheet 21 in the thickness direction and bonding it to the colloid 241 ;

[0166] S222 , disposing the second diaphragm 232 on the second surface of the first electrode sheet 21 in the thickness direction and bonding it to the colloid 241 . The diaphragm includes the first diaphragm 231 and the second diaphragm 232 .

[0167] Specifically, during the transportation of the first electrode piece 21, the first diaphragm 231 and the second diaphragm 232 can be respectively adhered to the two sides of the thickness direction of the first electrode piece 21 along the length direction of the first electrode piece 21, and the first diaphragm 231 and the second diaphragm 232 can be successively adhered and fixed together to the two ends of the length direction of the first electrode piece 21 through the colloid 241.

[0168] In this way, the diaphragm 23 has a larger surface area in the thickness direction of the diaphragm 23, so the bonding area of ​​the colloid 241 is larger, which is conducive to the colloid 241 to more stably bond the electrode piece and the diaphragm 23. In addition, the first electrode piece 21 is sandwiched between the first diaphragm 231 and the second diaphragm 232, so that the first electrode piece 21 and the second electrode piece 22 will not contact each other during the winding process.

[0169] See also Fig.15 and Fig.16 In some embodiments, a first pole piece 21 is provided (S10), comprising:

[0170] S11, providing a pole piece material 214;

[0171] S12, cutting the electrode raw material 214 to form the first electrode 21.

[0172] Specifically, the pole piece raw material 214 is a sheet-shaped material. The length of the pole piece raw material 214 is generally several times the length of the first pole piece 21. During the production process of the electrode assembly 20, the pole piece raw material 214 can be cut to obtain a plurality of first pole pieces 21. In this way, the first pole piece 21 is formed by cutting the pole piece raw material 214, and the production efficiency is high.

[0173] In some embodiments, the pole piece material 214 is formed with a plurality of thinning regions 2141, and the pole piece material 214 is cut to form the first pole piece 21 (S12), including:

[0174] The pole piece material 214 is cut from the position of the thinning area 2141 to form the first pole piece 21 , so that the thickness of the end of the first pole piece 21 is smaller than the thickness of the middle position of the first pole piece 21 .

[0175] Specifically, the electrode material 214 is cut off from the position of the thinning area 2141, so that the end of the obtained first electrode 21 is formed with a groove 213 (such as Figure 5 As shown in FIG. 2 , when the colloid 241 is provided, the colloid 241 can be at least partially accommodated in the groove 213. In this way, the colloid 241 is provided at the end of the first electrode sheet 21 with a smaller thickness, so that the surface of the starting end 201 and the ending end 202 of the electrode assembly 20 is relatively flat, and the probability of interference between the electrode assembly 20 and other components is reduced.

[0176] See also Fig.17 The production equipment 500 of the embodiment of the present application includes a first conveying device 510, a fixing device 520 and a winding device 530. The first conveying device 510 is used to convey the first electrode sheet 21; the fixing device 520 is used to fix the end of the first electrode sheet 21 and the diaphragm 23 through the connector 24 to form a layer assembly 203; the winding device 530 is used to wind the second electrode sheet 22 and the layer assembly 203 together to obtain the electrode assembly 20, the second electrode sheet 22 is located on the side of the diaphragm 23 away from the first electrode sheet 21, and the polarities of the second electrode sheet 22 and the first electrode sheet 21 are opposite.

[0177] Specifically, the first conveying device 510 can convey the first pole piece 21 to the fixing device 520. The first conveying device 510 can include at least one first conveying roller 511, and the first pole piece 21 can be supported on the first conveying roller 511. During the rotation of the first conveying roller 511, the first pole piece 21 can be driven along the length direction of the first pole piece 21. The fixing device 520 is a device for compounding the first pole piece 21 and the diaphragm to form the layer assembly 203, and the fixing device 520 is formed when the layer assembly 203 is in a flattened state.

[0178] The fixing device 520 fixes the first pole piece 21 and the diaphragm through the connector 24 by rolling, direct pressing, etc. The winding device 530 may include a winding roller, which can wind the second pole piece 22 and the layer assembly 203 to form the electrode assembly 20 during rotation.

[0179] In this way, the fixing device 520 fixes the end of the first pole piece 21 and the diaphragm 23 through the connector 24 to form a layer assembly 203; the winding device 530 winds the second pole piece 22 and the layer assembly 203 together to obtain the electrode assembly 20, so that at least one of the first pole piece 21 and the second pole piece 22 will not slip relative to the diaphragm 23, and the first pole piece 21 and the second pole piece 22 are unlikely to short-circuit, and there is no need to set a longer diaphragm 23 at the starting end 201 and / or the ending end 202 of the electrode assembly 20, thereby improving the utilization rate of the diaphragm 23 material and reducing the material waste of the diaphragm 23.

[0180] In some embodiments, the fixing device 520 is used to fix the two ends of the first pole piece 21 in the length direction to the diaphragm 23 through the connector 24 to form a layer assembly 203 .

[0181] In this way, both ends of the first pole piece 21 in the length direction are fixed to the diaphragm 23, so that the first pole piece 21 as a whole is relatively fixed to the diaphragm 23, and the risk of the first pole piece 21 slipping relative to the diaphragm 23 during the winding process is relatively small.

[0182] See also Figure 16-Figure 18 In some embodiments, the connector 24 includes a colloid 241, and the production equipment 500 includes a gluing device 540 disposed between the first conveying device 510 and the fixing device 520, the gluing device 540 is used to set the colloid 241 at the end of the first pole piece 21, and the fixing device 520 is used to set the diaphragm 23 on the first pole piece 21 and bond it to the colloid 241.

[0183] Specifically, the glue sticking device 540 can set the colloid 241 at the end of the first pole piece 21 by dispensing glue or the like, so that the first pole piece 21 and the colloid 241 can be combined first, and then the diaphragm 23 is compounded with the first pole piece 21 with the colloid 241, so that the colloid 241 can bond the diaphragm 23 and the first pole piece 21.

[0184] Exemplarily, when the colloid 241 needs to be provided at both ends of the first pole piece 21 , the gluing device 540 provides the colloid 241 at both ends of the first pole piece 21 at the same time, or the colloid 241 can be provided at both ends of the first pole piece 21 .

[0185] Thus, the colloid 241 is easy to obtain, so that the manufacturing cost of the electrode assembly 20 is low. In addition, the colloid 241 is viscous, which can make the connection between the first electrode plate 21 and the diaphragm 23 more stable.

[0186] See also Fig.18In some embodiments, the gluing device 540 includes an adsorption mechanism 541 and a gluing mechanism 542 disposed on one side of the adsorption mechanism 541. The adsorption mechanism 541 is used to adsorb the first pole piece 21. The gluing mechanism 542 can move relative to the adsorption mechanism 541 and transfer the colloid 241 on the gluing mechanism 542 to the end of the first pole piece 21.

[0187] Specifically, the adsorption mechanism 541 can keep the position of the first pole piece 21 fixed, reduce the bending, winding and other undesirable phenomena of the first pole piece 21 , so that the glue application mechanism 542 can transfer the colloid 241 to the end of the first pole piece 21 .

[0188] like Fig.18 As shown, the glue sticking mechanism 542 can move up and down relative to the adsorption mechanism 541 to transfer the colloid 241 to the first pole piece 21 .

[0189] like Fig.19 As shown, the glue applying mechanism 542 can move along the width direction of the first pole piece 21 relative to the adsorption mechanism 541 , and spray the colloid 24 on the first pole piece 21 by spraying.

[0190] In this way, the adsorption mechanism 541 and the glue sticking mechanism 542 cooperate with each other to accurately set the colloid 241 on the end of the first pole piece 21 .

[0191] See also Fig.18 In some embodiments, the adsorption mechanism 541 is formed with an adsorption hole 5411 , and the adsorption hole 5411 can form a negative pressure to adsorb the first pole piece 21 .

[0192] Specifically, the adsorption mechanism 541 can be connected to an exhaust device, and the exhaust device can extract the gas in the adsorption hole 5411, so that a negative pressure is formed in the adsorption hole 5411. By controlling the power and other parameters of the exhaust device, the adsorption hole 5411 can form negative pressures of different sizes, so that the adsorption force of the adsorption mechanism 541 can be controlled, and the adsorption mechanism 541 can absorb first pole pieces 21 of different specifications. For example, when the weight of the first pole piece 21 is large, the adsorption force formed by the adsorption mechanism 541 can be large.

[0193] In this way, the adsorption mechanism 541 utilizes negative pressure to adsorb the first electrode piece 21 , and the adsorption process is easy to control, which is beneficial to the transportation of the first electrode piece 21 and the setting of the colloid 241 on the first electrode piece 21 .

[0194] See also Fig.18In some embodiments, the adsorption mechanism 541 includes a conveyor belt 5412, and the glue mechanism 542 includes a first glue component 5421 and a second glue component 5422. The first glue component 5421 and the second glue component 5422 are respectively arranged on opposite sides of the conveyor belt 5412. The first glue component 5421 is used to set the first colloid 2411 on the first side of the conveyor belt 5412. The conveyor belt 5412 rotates to drive the first colloid 2411 located on the first side of the conveyor belt 5412 to the second side of the conveyor belt 5412, so that the first colloid 2411 located on the second side of the conveyor belt 5412 is bonded to the first surface of the first pole piece 21 moved from the first conveying device 510. The second glue component 5422 is used to set the second colloid 2412 on the second surface of the first pole piece 21 moved from the first conveying device 510. The first surface and the second surface of the first pole piece 21 are arranged opposite to each other along the thickness direction of the first pole piece 21.

[0195] Specifically, Fig.18 As shown in the orientation, the first adhesive component 5421 is arranged below the conveyor belt 5412, and the second adhesive component 5422 is arranged above the conveyor belt 5412. For example, two release films can be arranged on the lower side of the conveyor belt 5412, and then the first adhesive device 540 moves toward the conveyor belt 5412 to respectively arrange the two first adhesives 2411 on the corresponding release films. With the rotation of the conveyor belt 5412 and the operation of the first conveying device 510, the first adhesive 2411 rotates to the upper side of the conveyor belt 5412 and adheres to the first surface of the first pole piece 21; then, the second adhesive component 5422 moves downward to adhere the second adhesive 2412 to the second surface of the first pole piece 21, so that the adhesives 241 are respectively arranged on the two surfaces of the first pole piece 21.

[0196] In this way, the colloid 241 is disposed on both the first surface and the second surface of the first pole piece 21, so that the first pole piece 21 can be sandwiched between the two diaphragms 23 and bonded to the diaphragm 23, which is conducive to more stable bonding of the pole piece and the diaphragm 23 by the colloid 241. In addition, the first pole piece 21 is sandwiched between the first diaphragm 23231 and the second diaphragm 23232, so that the first pole piece 21 and the second pole piece 22 will not contact each other during the winding process.

[0197] In some embodiments, the fixing device 520 includes a composite roller set 521, which includes two composite rollers 5211 arranged opposite to each other. The two composite rollers 5211 are used to roll the first pole piece 21 with the colloid 241 and the diaphragm 2323 so that the diaphragm 2323 is arranged on the first pole piece 21 and bonded to the colloid 241.

[0198] Specifically, a gap of a predetermined distance is formed between the two composite rollers 5211 , the first pole piece 21 and the diaphragm 2323 are composited together under the pressure of the two composite rollers 5211 , and the colloid 241 can bond the diaphragm 2323 and the first pole piece 21 .

[0199] In this way, the first pole piece 21 and the diaphragm 23 are rolled and fixed together by the composite roller set 521 to obtain the layer assembly 203, so that the production efficiency of the first pole piece 21 and the diaphragm 23 is relatively high.

[0200] In certain embodiments, the production apparatus 500 includes a second conveying device 550 disposed between the fixing device 520 and the winding device 530 , and the second conveying device 550 is used to convey the layer assembly 203 to the winding device 530 .

[0201] Specifically, the second conveying device 550 may include at least one second conveying roller 551 , and the layer assembly 203 may be supported on the second conveying roller 551 . During the rotation of the second conveying roller 551 , the layer assembly 203 may be transmitted along the length direction of the layer assembly 203 .

[0202] In this way, the second conveying device 550 can keep the shape of the layer assembly 203 stable, which is conducive to the winding device 530 winding the layer assembly 203 and the second pole piece 22 together.

[0203] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0204] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A manufacturing method for an electrode assembly, characterized in that: The manufacturing method comprises: Providing a first pole piece; Fixing the end of the first pole piece and the diaphragm through a connector to form a layer assembly; The second pole sheet is wound together with the layer assembly to obtain the electrode assembly, wherein the second pole sheet is located on a side of the diaphragm away from the first pole sheet, and the second pole sheet and the first pole sheet have opposite polarities.

2. The manufacturing method according to claim 1, characterized in that: The step of fixing the end of the first pole piece and the diaphragm through a connector to form a layer assembly includes: The two ends of the first pole piece in the length direction are fixed to the diaphragm through the connector to form the layer assembly.

3. The manufacturing method according to claim 1, characterized in that: The connector includes a colloid, and the end of the first pole piece is fixed to the diaphragm through the connector to form a layer assembly, including: The colloid is arranged at the end of the first pole piece; The diaphragm is disposed on the first pole piece and bonded to the colloid.

4. The manufacturing method according to claim 3, characterized in that: The colloid is arranged at the end of the first pole piece, comprising: The colloid is arranged on both sides of the first pole piece in the thickness direction; The step of arranging the diaphragm on the first pole piece and bonding it to the colloid comprises: Disposing a first diaphragm on a first surface in a thickness direction of the first pole piece and bonding the diaphragm to the colloid; A second diaphragm is arranged on a second surface of the first pole piece in a thickness direction and bonded to the colloid, wherein the diaphragm includes the first diaphragm and the second diaphragm.

5. The manufacturing method according to claim 1, characterized in that: Providing a first pole piece includes: Providing a pole piece raw material; The pole piece raw material is cut to form the first pole piece.

6. The manufacturing method according to claim 5, characterized in that: The pole piece material is formed with a plurality of thinning regions, and the step of cutting the pole piece material to form the first pole piece includes: The pole piece material is cut off from the position of the thinning area to form the first pole piece, so that the thickness of the end of the first pole piece is smaller than the thickness of the middle position of the first pole piece.

7. An electrode assembly, characterized in that: The electrode assembly is manufactured by the manufacturing method according to any one of claims 1 to 6, and the electrode assembly comprises: First pole piece; a second pole piece, the second pole piece being stacked with the first pole piece along a thickness direction of the first pole piece, and the second pole piece and the first pole piece have opposite polarities; A diaphragm, the diaphragm isolating the first pole piece from the second pole piece and is stacked with the first pole piece along a thickness direction of the first pole piece; Wherein, at the starting end and / or the ending end of the winding of the electrode assembly, at least one of the first pole sheet and the second pole sheet is fixed to the diaphragm via a connector.

8. A battery cell, characterized in that: Comprising the electrode assembly according to claim 7.

9. A battery, characterized in that: The invention comprises a plurality of battery cells as claimed in claim 8.

10. An electrical device, characterized in that: Comprising the battery cell according to claim 8 or the battery according to claim 9.

11. A production equipment, characterized in that: include: A first conveying device, used for conveying a first pole piece; A fixing device, used to fix the end of the first pole piece and the diaphragm through a connector to form a layer assembly; The winding device is used to wind the second pole piece together with the layer assembly to obtain an electrode assembly, wherein the second pole piece is located on the side of the diaphragm away from the first pole piece, and the second pole piece and the first pole piece have opposite polarities.

12. The production equipment according to claim 11, characterized in that The fixing device is used to fix the two end portions of the first pole piece in the length direction to the diaphragm through the connector to form the layer assembly.

13. The production equipment according to claim 11, characterized in that The connector includes a colloid, the production equipment includes a gluing device arranged between the first conveying device and the fixing device, the gluing device is used to set the colloid on the end of the first pole piece, and the fixing device is used to set the diaphragm on the first pole piece and bond it to the colloid.

14. The production equipment according to claim 13, characterized in that The gluing device includes an adsorption mechanism and a gluing mechanism arranged on one side of the adsorption mechanism, the adsorption mechanism is used to adsorb the first pole piece, the gluing mechanism can move relative to the adsorption mechanism and transfer the colloid on the gluing mechanism to the end of the first pole piece.

15. The production equipment according to claim 14, characterized in that The adsorption mechanism is formed with an adsorption hole, and the adsorption hole can form a negative pressure to adsorb the first pole piece.

16. The production equipment according to claim 14, characterized in that The adsorption mechanism includes a conveyor belt, and the glue-applying mechanism includes a first glue-applying component and a second glue-applying component, the first glue-applying component and the second glue-applying component are respectively arranged on opposite sides of the conveyor belt, the first glue-applying component is used to set the first colloid on the first side of the conveyor belt, and the rotation of the conveyor belt drives the first colloid located on the first side of the conveyor belt to the second side of the conveyor belt, so that the first colloid located on the second side of the conveyor belt is bonded to the first surface of the first pole piece moved from the first conveying device, and the second glue-applying component is used to set the second colloid on the second surface of the first pole piece moved from the first conveying device, and the first surface and the second surface of the first pole piece are arranged opposite to each other along the thickness direction of the first pole piece.

17. The production equipment according to claim 13, characterized in that The fixing device comprises a composite roller group, wherein the composite roller group comprises two composite rollers arranged opposite to each other, and the two composite rollers are used to roll the first pole piece with the colloid and the diaphragm so that the diaphragm is arranged on the first pole piece and bonded to the colloid.

18. The production equipment according to claim 11, characterized in that The production plant comprises a second conveying device arranged between the fixing device and the winding device, the second conveying device being used to convey the layer assembly to the winding device.

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