Electrode assembly and processing method and apparatus, battery cell, battery and power consuming device

Abstract

This application provides an electrode assembly, a processing method and apparatus, a battery cell, a battery, and a power consuming device. The processing method includes applying an adhesive to a predetermined portion of a surface of a coated member and forming a blocking layer using the adhesive. The coated member may include at least one of a cathode plate, a separator, and an anode plate. The cathode plate, anode plate, and separator are wound to form an electrode assembly. After winding, the blocking layer is positioned between adjacent cathode active material layers and cathode active material layers, and the blocking layer blocks the cathode active material layer located on the other side of the blocking layer, absorbing at least some of the ions released from the cathode active material layer located on one side of the blocking layer. Forming a blocking layer by applying an adhesive is easy to produce and process, and can improve production efficiency. The coated member may include at least one of a cathode plate, a separator, and an anode plate.

Description

[Technical field]

[0001] This application relates to the field of batteries, and in particular to electrode assemblies and processing methods and apparatus, battery cells, batteries, and power consuming devices. [Background technology]

[0002] Rechargeable batteries, also known as secondary batteries, are batteries that can be used continuously after being discharged by activating the active material through charging. Rechargeable batteries are widely used in electronic devices, such as mobile phones, notebook computers, battery cars, electric cars, electric airplanes, electric steamships, electric toy cars, electric toy steamships, electric toy airplanes, and electric tools.

[0003] Rechargeable batteries may include nickel cadmium batteries, nickel hydrogen batteries, lithium ion batteries, secondary alkaline zinc manganese batteries, and the like.

[0004] Currently, the batteries most commonly used in automobiles are generally lithium-ion batteries, which, as rechargeable batteries, have the advantages of small volume, high energy density, high power density, many cycles, and long storage time.

[0005] The rechargeable battery includes an electrode assembly and an electrolyte solution, the electrode assembly including a negative electrode plate, a positive electrode plate, and a separator located between the negative electrode plate and the positive electrode plate. The negative electrode plate may be called a negative electrode plate, and both of the two surfaces of the negative electrode plate have a negative electrode active material layer, for example, the negative electrode active material of the negative electrode active material layer may be lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, or lithium nickel cobalt manganese oxide, and the positive electrode plate may be called a positive electrode plate, and both of the two surfaces of the positive electrode plate have a positive electrode active material layer, for example, the positive electrode active material of the positive electrode active material layer may be graphite or silicon.

[0006] Lithium deposition is a common abnormal phenomenon in lithium batteries, which affects the charging efficiency and energy density of lithium ions. When the lithium deposition is serious, lithium crystals can be formed, which can break through the separator and cause internal short circuits and thermal runaway, which can seriously impair the safety of the battery. Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, how to reduce or avoid lithium precipitation to improve the safety of batteries has become one of the challenges facing the industry. [Means for solving the problem]

[0008] Aspects of the present application provide electrode assemblies and processing methods and apparatus, battery cells, batteries and power consuming devices that overcome or at least partially alleviate the above-mentioned problems.

[0009] According to a first aspect of the present application, there is provided a method for processing an electrode assembly, the electrode assembly including a cathode plate, an anode plate, and a separator, the separator for isolating the cathode plate and the anode plate, the electrode assembly being formed by winding the cathode plate, the separator, and the anode plate, the cathode plate including a cathode active material layer, and the anode plate including a cathode active material layer, the method including: applying an adhesive to a predetermined portion of a surface of a coating member and forming a blocking layer with the adhesive, the coating member including at least one of a cathode plate, the separator, and an anode plate; and winding the cathode plate, the anode plate, and the separator to form an electrode assembly, wherein the blocking layer is located between adjacent cathode active material layers and anode active material layers after winding, and the blocking layer is for blocking a positive electrode active material layer located on the other side of the blocking layer that occludes at least a portion of ions released from a negative electrode active material layer located on one side of the blocking layer.

[0010] In this embodiment, a blocking layer is formed by applying an adhesive to a predetermined portion of the surface of the coated member, the predetermined portion corresponds to a portion of the positive electrode active material layer where lithium deposition is likely to occur, and at least a portion of the ions released from the negative electrode active material layer during charging is blocked by the blocking layer, and the ions blocked by the blocking layer cannot be absorbed by the positive electrode active material layer adjacent to the negative electrode active material layer, thereby reducing the occurrence of lithium deposition in the portion of the positive electrode plate where lithium deposition is likely to occur, improving the safety performance of the battery cell, and improving the service life of the battery cell. The method of forming a blocking layer by applying an adhesive is easy to produce and process, and can improve production efficiency. The coated member may include at least one of a negative electrode plate, a separator, and a positive electrode plate.

[0011] In some embodiments, before the step of applying adhesive to the predetermined region on the surface of the workpiece, the method includes determining position information of the predetermined region based on a predetermined post-winding position, where the predetermined post-winding position is a position in the electrode assembly after winding of the blocking layer, where the predetermined post-winding position is located between adjacent cathode active material layers and anode active material layers, and the position information of the predetermined region includes information for indicating a coating start position and a coating end position of the blocking layer; winding the uncoated cathode plate, anode plate, and separator; obtaining winding data of the cathode plate, separator, and anode plate; and determining coating information based on the winding data and the position information of the predetermined region; and applying adhesive to the predetermined region on the surface of the workpiece includes applying adhesive to the predetermined region on the surface of the workpiece based on the coating information.

[0012] In this embodiment, the position information of the predetermined portion is determined based on the predetermined position after winding, winding data is obtained, and application information is determined based on the winding data and the position information of the predetermined portion, and the adhesive is applied to the predetermined portion of the surface of the member to be coated based on the application information, thereby automating the application of the blocking layer. The formation of the blocking layer may be performed in synchronization with the winding operation, thereby accurately achieving the application of the blocking layer.

[0013] In some embodiments, the winding data includes the winding line speed of the coated member, the position information of the predetermined portion includes the coating start length and coating end length of the blocking layer, and the coating information includes the coating start time and coating end time.

[0014] In this embodiment, the coating start time and coating end time can be determined based on the coating start length and coating end length of the blocking layer and the winding line speed of the coated workpiece, and by determining the coating time of the blocking layer based on the coating start time and coating end time, automatic coating of the blocking layer can be accurately achieved.

[0015] In some embodiments, the winding data includes an overall winding angle θ of the cathode plate, the separator, and the anode plate, the position information of the preset portion includes a coating start angle θ1 and a coating end angle θ2 of the blocking layer, and the coating information includes a coating start signal and a coating end signal.

[0016] In this embodiment, the coating start signal and the coating end signal can be determined based on the coating start angle θ1 and the coating end angle θ2 of the blocking layer, and the overall winding angle θ of the cathode plate, the separator and the anode plate. Based on the coating start signal and the coating end signal, the coating of the blocking layer can be accurately controlled, thereby accurately realizing automatic coating of the blocking layer.

[0017] In some embodiments, the pre-determined post-winding locations are one or two surfaces of a cathode plate, and / or one or two surfaces of anode plate, and / or one or two surfaces of a separator.

[0018] In this embodiment, the predetermined post-winding positions are set on one or two surfaces of the negative electrode plate, and / or one or two surfaces of the positive electrode plate, and / or one or two surfaces of the separator, which can block some ions and reduce the occurrence of lithium deposition.

[0019] In some embodiments, the cathode plate, the separator, and the anode plate are wound to form a bent region, and at least a portion of the pre-determined wound position is located on a surface of at least one of the anode plate, the separator, and the cathode plate within the bent region.

[0020] In this embodiment, during charging, lithium precipitation is likely to occur in the curved region. By providing at least a portion of the blocking layer on the surface of at least one of the negative electrode plate, the positive electrode plate, and the separator in the curved region, at least a portion of the ions released from the negative electrode active material layer in the curved region are blocked by the blocking layer, and the ions blocked by the blocking layer cannot be absorbed in the positive electrode active material layer in the curved region of the positive electrode plate adjacent to the negative electrode plate. This reduces the occurrence of lithium precipitation in the curved region, improves the safety performance of the battery cell, and increases the service life of the battery cell.

[0021] In some embodiments, at least a portion of the predetermined post-winding positions is located at the first bend site and / or the second bend site of the cathode plate in the bend region, and / or at least a portion of the predetermined post-winding positions is located at the first bend site and / or the second bend site of the anode plate, and / or at least a portion of the predetermined post-winding positions is located at the bend site of the separator adjacent to the first bend site of the cathode plate and / or the bend site of the separator adjacent to the second bend site of the cathode plate, and / or at least a portion of the predetermined post-winding positions is located at the bend site of the separator adjacent to the first bend site of the anode plate and / or the bend site of the separator adjacent to the second bend site of the anode plate.

[0022] In this embodiment, during charging, lithium deposition is likely to occur at the first bent portion of the negative electrode and the second bent portion of the negative electrode, and at least a portion of the predetermined post-winding position is set at the first bent portion and / or the second bent portion of the negative electrode plate in the bent region, and / or at least a portion of the predetermined post-winding position is set at the first bent portion and / or the second bent portion of the positive electrode plate, and / or at least a portion of the predetermined post-winding position is set at the bent portion of the separator adjacent to the first bent portion of the negative electrode plate and / or the bent portion of the separator adjacent to the second bent portion, and / or at least a portion of the predetermined post-winding position is set at the bent portion of the separator adjacent to the first bent portion of the negative electrode plate. By disposing at least a part of the blocking layer in the bent portion of the separator adjacent to the first bent portion of the anode plate and / or in the bent portion of the separator adjacent to the second bent portion of the anode plate, at least a part of the ions released from the cathode active material layer in the first bent portion of the cathode and the second bent portion of the cathode are blocked by the blocking layer, and the ions blocked by the blocking layer cannot be absorbed in the anode active material layer in the bent region of the anode plate adjacent to the cathode plate. This reduces the occurrence of lithium deposition in the anode plate adjacent to the first bent portion of the cathode and the second bent portion of the cathode, improves the safety performance of the battery cell, and increases the service life of the battery cell.

[0023] In some embodiments, the method of applying the adhesive to the predetermined areas on the surface of the separator includes press application, roller application, or spray application.

[0024] In this embodiment, the adhesive can be rapidly applied by a press application method, a roller application method, or a spray application method.

[0025] In some embodiments, the adhesive comprises at least one of polyacrylic acid / acrylates, butylbenzene, phenylpropyl, ethylene-vinyl acetate copolymers, polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy adhesives, silicone adhesives, polyurethane adhesives, styrene-isoprene-styrene copolymer adhesives, and modifications of the foregoing materials.

[0026] According to a second aspect of the present application, there is provided an electrode assembly processing device, the electrode assembly including a cathode plate, an anode plate, and a separator, the separator being for isolating the cathode plate from the anode plate, the electrode assembly being formed by winding the cathode plate, the separator, and the anode plate, the cathode plate including a cathode active material layer, and the anode plate including a cathode active material layer, the processing device being a coating mechanism for coating an adhesive on a predetermined portion of a surface of a coating target member and forming a blocking layer with the adhesive, the coating target member being the cathode plate, a coating mechanism including at least one of a cathode plate, a separator, and an anode plate; and a winding mechanism for winding the cathode plate, the anode plate, and the separator to form an electrode assembly, the coating mechanism including a winding mechanism located upstream of the winding mechanism, wherein the blocking layer is located between adjacent cathode active material layers and anode active material layers after the winding, and the blocking layer is for blocking the anode active material layer located on the other side of the blocking layer in which at least a portion of ions released from the cathode active material layer located on one side of the blocking layer are occluded after the winding.

[0027] In this embodiment, a coating mechanism is installed upstream of the winding mechanism, and a blocking layer is formed at a predetermined region on the surface of the coated member. After the cathode plate, the separator, and the anode plate are wound to form an electrode assembly, the predetermined region corresponds to a region where lithium deposition is likely to occur in the anode active material layer, and the blocking layer can block the anode active material layer located on the other side of the blocking layer from absorbing at least a portion of the ions released from the cathode active material layer located on one side of the blocking layer. During charging, at least a portion of the ions released from the cathode active material layer are blocked by the blocking layer, and the ions blocked by the blocking layer cannot be absorbed by the anode active material layer, thereby reducing the occurrence of lithium deposition in the region of the anode plate where lithium deposition is likely to occur, improving the safety performance of the battery cell, and increasing the service life of the battery cell.

[0028] In some embodiments, the processing apparatus further includes: a position information determination unit that determines position information of a predetermined portion based on a predetermined position after winding and sends it to the application information determination unit, where the predetermined position after winding is a position in the electrode assembly after the blocking layer is wound, and the predetermined position after winding is located between adjacent cathode active material layers and anode active material layers, and the position information of the predetermined portion includes information for indicating a coating start position and a coating end position of the blocking layer; a winding control unit that controls the winding mechanism to wind the uncoated cathode plate, anode plate, and separator; an acquisition unit that acquires winding data of the cathode plate, separator, and anode plate and sends it to the application information determination unit; a coating information determination unit that determines coating information based on the winding data and the position information of the predetermined portion; and a coating control unit that controls the coating mechanism to apply adhesive to a surface of a coating target member based on the coating information.

[0029] In this embodiment, the position information determining unit determines the position information of the preset portion based on the preset position after winding, the winding control unit controls the winding mechanism, the acquisition unit acquires the winding data, the application information determining unit determines the application information based on the winding data and the position information of the preset portion, and the application control unit applies the adhesive to the preset portion on the surface of the coated member based on the application information, thereby automating the application of the blocking layer. The formation of the blocking layer may be performed in synchronization with the winding operation, so that the application of the blocking layer can be accurately achieved.

[0030] In some embodiments, the winding data includes the winding line speed of the coated member, the position information of the predetermined portion includes the coating start length and coating end length of the blocking layer, and the coating information includes the coating start time and coating end time.

[0031] In this embodiment, the coating start time and coating end time can be determined based on the coating start length and coating end length of the blocking layer and the winding line speed of the coated workpiece, and by determining the coating time of the blocking layer based on the coating start time and coating end time, automatic coating of the blocking layer can be accurately achieved.

[0032] In some embodiments, the winding data includes an overall winding angle θ of the cathode plate, the separator, and the anode plate, the position information of the preset portion includes a coating start angle θ1 and a coating end angle θ2 of the blocking layer, and the coating information includes a coating start signal and a coating end signal.

[0033] In this embodiment, the coating start signal and the coating end signal can be determined based on the coating start angle θ1 and the coating end angle θ2 of the blocking layer, and the overall winding angle θ of the cathode plate, the separator and the anode plate. Based on the coating start signal and the coating end signal, the coating of the blocking layer can be accurately controlled, thereby accurately realizing automatic coating of the blocking layer.

[0034] In some embodiments, the pre-determined post-winding locations are one or two surfaces of a cathode plate, and / or one or two surfaces of anode plate, and / or one or two surfaces of a separator.

[0035] In this embodiment, the predetermined post-winding positions are set on one or two surfaces of the negative electrode plate, and / or one or two surfaces of the positive electrode plate, and / or one or two surfaces of the separator, which can block some ions and reduce the occurrence of lithium deposition.

[0036] In some embodiments, the cathode plate, the separator, and the anode plate are wound to form a bent region, and at least a portion of the pre-determined wound position is located on a surface of at least one of the anode plate, the separator, and the cathode plate within the bent region.

[0037] In this embodiment, during charging, lithium precipitation is likely to occur in the curved region. By providing at least a portion of the blocking layer on the surface of at least one of the negative electrode plate, the positive electrode plate, and the separator in the curved region, at least a portion of the ions released from the negative electrode active material layer in the curved region are blocked by the blocking layer, and the ions blocked by the blocking layer cannot be absorbed in the positive electrode active material layer in the curved region of the positive electrode plate adjacent to the negative electrode plate. This reduces the occurrence of lithium precipitation in the curved region, improves the safety performance of the battery cell, and increases the service life of the battery cell.

[0038] In some embodiments, at least a portion of the predetermined post-winding positions is located at the first bend site and / or the second bend site of the cathode plate in the bend region, and / or at least a portion of the predetermined post-winding positions is located at the first bend site and / or the second bend site of the anode plate, and / or at least a portion of the predetermined post-winding positions is located at the bend site of the separator adjacent to the first bend site of the cathode plate and / or the bend site of the separator adjacent to the second bend site of the cathode plate, and / or at least a portion of the predetermined post-winding positions is located at the bend site of the separator adjacent to the first bend site of the anode plate and / or the bend site of the separator adjacent to the second bend site of the anode plate.

[0039] In this embodiment, during charging, lithium deposition is likely to occur in the anode plate adjacent to the first bending portion and the second bending portion of the cathode and / or the anode, and at least a part of the predetermined post-winding position is set at the first bending portion and / or the second bending portion of the cathode plate in the bending region, and / or at least a part of the predetermined post-winding position is set at the first bending portion and / or the second bending portion of the anode plate, and / or at least a part of the predetermined post-winding position is set at the bending portion of the separator adjacent to the first bending portion of the cathode plate and / or the bending portion of the separator adjacent to the second bending portion, and / or at least a part of the predetermined post-winding position is set at the bending portion of the separator adjacent to the first bending portion of the cathode plate and / or the bending portion of the separator adjacent to the second bending portion, and / or at least a part of the predetermined By locating at least a portion of the post-winding position at the bent portion of the separator adjacent to the first bent portion of the anode plate and / or at the bent portion of the separator adjacent to the second bent portion of the anode plate, at least a portion of the ions released from the cathode active material layer at the first bent portion of the cathode and the second bent portion of the cathode are blocked by the blocking layer, and the ions blocked by the blocking layer cannot be absorbed in the anode active material layer in the bent region of the anode plate adjacent to the cathode plate. This reduces the occurrence of lithium deposition in the anode plate adjacent to the first bent portion of the cathode and the second bent portion of the cathode, improves the safety performance of the battery cell, and increases the service life of the battery cell.

[0040] In some embodiments, the application mechanism is for applying an adhesive to a predetermined portion of a surface of a workpiece to form a blocking layer, the application mechanism comprising: The adhesive application device includes an adhesive application section for applying adhesive to a predetermined portion of the surface of the workpiece, an adhesive supply mechanism for providing adhesive to the adhesive application section, and a drive mechanism for driving the adhesive application section to press against the surface of the workpiece or to move away from the surface of the workpiece, wherein the drive mechanism is connected in communication with an application control unit.

[0041] In this embodiment, a coating mechanism is provided to coat the adhesive on a predetermined portion of the surface of the member to be coated by an adhesive coating method, thereby forming a blocking layer, and a driving mechanism is provided to drive the adhesive coating unit to press against or move away from the surface of the member to be coated, and the driving mechanism is connected in communication with a coating control unit. The control unit controls the driving mechanism to press the adhesive coating unit against or move away from the member to be coated, thereby controlling the coating position and coating area of ​​the adhesive coating, so that the adhesive can be accurately coated on the predetermined portion of the surface of the separator.

[0042] In some embodiments, the adhesive applicator may be located on one side of the workpiece, or there may be multiple adhesive applicators, one on each side of the workpiece.

[0043] In this embodiment, by providing an adhesive application section on one or both sides of the member to be coated, it is possible to apply adhesive to one or both surfaces of the member to be coated.

[0044] In some embodiments, an adhesive layer is provided on the side of the adhesive application section facing the workpiece, the adhesive layer being in communication with an adhesive supply mechanism, or the adhesive application section includes an adhesive application roller and an adhesive layer is applied in the circumferential direction of the adhesive application roller, the adhesive layer being in communication with an adhesive supply mechanism, and the adhesive application roller is rotatably mounted and connected to a drive mechanism.

[0045] In this embodiment, the adhesive application unit can use a press application method to directly press the adsorption layer onto the surface of the separator to apply the adhesive to the workpiece, or the adhesive application unit can use an adhesive application roller method, in which an adsorption layer is installed in the circumferential direction of the adhesive application roller, and when the adhesive application roller contacts the separator, the adhesive application roller rolls along the surface of the separator to apply the adhesive to the workpiece.

[0046] In some embodiments, the application mechanism is for applying adhesive to a predetermined portion of the surface of the workpiece to form an inhibitor layer, and the application mechanism includes a nozzle for applying adhesive to the predetermined portion of the surface of the workpiece, an adhesive supply mechanism for providing adhesive to the nozzle, and a control valve for connecting the adhesive supply mechanism to the nozzle and connected in communication with the application control unit.

[0047] In this embodiment, the coating mechanism is a spray coating type, and the nozzle is controlled by the control unit to control the coating position and coating area of ​​the adhesive, so that the adhesive can be accurately applied to a predetermined portion of the separator surface.

[0048] In some embodiments, the nozzle is located on one side of the separator, or there are multiple nozzles, one on each side of the separator.

[0049] In this embodiment, the nozzle is installed on one side of the workpiece, or there are multiple nozzles, each installed on both sides of the workpiece.

[0050] In this embodiment, by providing a nozzle on one or both sides of the member to be coated, it is possible to realize coating of adhesive on one or both surfaces of the member to be coated.

[0051] In some embodiments, the adhesive comprises at least one of polyacrylic acid / acrylates, butylbenzene, phenylpropyl, ethylene-vinyl acetate copolymers, polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy adhesives, silicone adhesives, polyurethane adhesives, styrene-isoprene-styrene copolymer adhesives, and modifications of the foregoing materials.

[0052] According to a third aspect of the present application, there is provided an electrode assembly processed by the processing method according to the embodiment of the first aspect.

[0053] According to a fourth aspect of the present application, there is provided a battery cell, the battery cell comprising a housing, an electrolyte, a cover plate and at least one electrode assembly according to an embodiment of the third aspect, wherein the housing comprises a receiving cavity and an opening, the electrode assembly and the electrolyte are received in the receiving cavity, and the cover plate is for closing the opening of the housing.

[0054] According to a fifth aspect of the present application, there is provided a battery, the battery including a housing and at least one battery cell according to an embodiment of the fourth aspect, the battery cell being housed within the housing.

[0055] According to a sixth aspect of the present application, there is provided a power consumption device configured to receive electrical energy provided by a battery according to an embodiment of the fifth aspect above.

[0056] The above description is merely an outline of the technical solutions of the embodiments of the present application, which can be implemented based on the contents of the specification in order to more clearly understand the technical means of the embodiments of the present application, and in order to make the above and other objectives, features and advantages of the embodiments of the present application more obvious and understandable, the following lists specific embodiments of the present application. [Brief description of the drawings]

[0057] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly describe the drawings that need to be used in the embodiments. It should be apparent that the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without paying creative efforts.

[0058] [Figure 1] FIG. 1 is a perspective structural schematic diagram of an electrode assembly according to an embodiment of the present application; [Diagram 2] 2 is a structural schematic diagram of a cross-section of the electrode assembly of FIG. 1 along a direction perpendicular to the winding axis K. FIG. [Diagram 3] 1 is a flow chart of a method for fabricating an electrode assembly according to one embodiment of the present application. [Figure 4] 4 is a flow chart of a method for fabricating an electrode assembly according to another embodiment of the present application. [Diagram 5] FIG. 13 is a structural schematic diagram of a flat-shaped electrode assembly according to another embodiment of the present application, the entire assembly being unfolded into a flat state. [Figure 6] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 7] FIG. 2 is a structural schematic diagram of a cathode plate in another embodiment of the present application. [Figure 8] 8 is a schematic diagram of a cross-sectional structure taken along the CC direction in FIG. 7. [Figure 9] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 10] FIG. 10 is a schematic diagram of the DD cross-sectional structure of the cathode plate in FIG. [Figure 11] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 12] FIG. 2 is a structural schematic diagram of a cathode plate in another embodiment of the present application. [Figure 13] 13 is a schematic diagram of a cross-sectional structure taken along the EE direction in FIG. 12. [Figure 14] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 15] FIG. 2 is a schematic cross-sectional structure diagram of an anode plate according to another embodiment of the present application. [Figure 16] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 17] 17 is a schematic diagram of a cross-sectional structure taken along the FF direction in FIG. 16. [Figure 18] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 19] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 20] 20 is a schematic diagram of a cross-sectional structure taken along the direction GG in FIG. 19. [Figure 21] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 22] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 23] FIG. 11 is a structural schematic diagram of a cross-sectional view perpendicular to the winding axis of another flat-shaped electrode assembly according to another embodiment of the present application. [Figure 24] FIG. 2 is a structural schematic diagram of an electrode assembly processing apparatus according to an embodiment of the present application; [Diagram 25] FIG. 2 is a structural schematic diagram of an electrode assembly processing apparatus according to another embodiment of the present application; [Figure 26] FIG. 2 is a structural schematic diagram of an electrode assembly processing apparatus according to another embodiment of the present application; [Figure 27] FIG. 27 is an enlarged schematic view of an embodiment of the application mechanism in FIG. 26. [Figure 28] FIG. 2 is a structural schematic diagram of an electrode assembly processing apparatus according to another embodiment of the present application; [Figure 29] FIG. 2 is a structural schematic diagram of an electrode assembly processing apparatus according to another embodiment of the present application; [Diagram 30] FIG. 30 is an enlarged schematic view of an embodiment of the application mechanism in FIG. 29. [Diagram 31] FIG. 30 is an enlarged schematic view of another embodiment of the application mechanism in FIG. 29. [Diagram 32] FIG. 2 is a structural schematic diagram of an electrode assembly processing apparatus according to another embodiment of the present application; [Diagram 33] FIG. 33 is an enlarged schematic view of an embodiment of the application mechanism in FIG. 32. [Diagram 34] FIG. 2 is a structural schematic diagram of a battery cell according to another embodiment of the present application. [Diagram 35] FIG. 2 is a structural schematic diagram of a battery module according to another embodiment of the present application. [Diagram 36] FIG. 2 is a structural schematic diagram of a battery according to another embodiment of the present application. [Figure 37]FIG. 2 is a structural schematic diagram of a power consumption device according to another embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0059] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below clearly and completely in conjunction with the drawings of the embodiments of the present application. It is clear that the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in the specification of the application herein are only intended to describe specific embodiments and are not intended to limit the application. The terms "including", "having" and any variations thereof in the specification, claims and above description of the drawings of the application are intended to cover non-exclusive "including".

[0061] When referring to an "embodiment" in the present specification, it means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The phrases appearing in various places in the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive independent or alternative embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiment described in the present specification may be combined with other embodiments.

[0062] The term "and / or" in this text is merely a relational relationship that describes related objects, and indicates that three relations may exist, for example, A and / or B may represent three cases: A alone, A and B in combination, and B alone. Also, the character " / " in this text generally indicates that the related objects before and after are in an "or" relationship.

[0063] In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are orientations or positional relationships shown in the drawings, and are merely for the convenience and simplification of the description of this application, and do not indicate or suggest that the indicated devices or elements have a specific orientation, and must be configured and operated in a specific orientation, and therefore should not be understood as limitations on this application. In addition, the terms "first", "second", and the like in the specification and claims of this application or the above drawings are intended to distinguish different objects, and are not intended to describe a specific order or a primary-secondary relationship, and may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0064] In the description of the present application, it should be explained that unless otherwise specified and limited, the terms "attached", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a removable connection, or an integral connection, it may be a mechanical connection, it may be an electrical connection, it may be a direct connection, it may be an indirect connection via an intermediate medium, or it may be a communication between the insides of two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0065] In order to make the volume of the lithium ion battery smaller and the energy density higher, the negative electrode plate, the positive electrode plate and the separator in the electrode assembly of the lithium ion battery can be wound and then compacted. For example, FIG. 1 shows a perspective structural schematic diagram of the electrode assembly. The electrode assembly includes a positive electrode plate 1, a negative electrode plate 2, a first separator 31 and a second separator 32, where the positive electrode plate 1, the first separator 31, the negative electrode plate 2 and the second separator 32 are stacked from the inside to the outside along the radial direction and then wound around a winding axis K to form a wound structure, and the separator is an insulating film that separates the positive electrode plate 1 and the negative electrode plate 2 and prevents the positive electrode plate 1 and the negative electrode plate 2 from shorting, and the wound structure of the electrode assembly is flattened, and the structural schematic diagram of the cross section of the electrode assembly along the direction perpendicular to the winding axis K may be as shown in FIG. 2.

[0066] 1 and 2 in combination, the electrode assembly includes a straight region A, and a first bent region B1 and a second bent region B2 located at both ends of the straight region A. The straight region A refers to a region having a parallel structure in the wound structure, i.e., the anode plate 1, the first separator 31, the cathode plate 2 and the second separator 32 in the straight region A are substantially parallel to each other, i.e., the surfaces of the anode plate 1, the first separator 31, the cathode plate 2 and the second separator 32 of each layer of the electrode assembly in the straight region A are all substantially flat. The first bent region B1 and the second bent region B2 refer to regions having a bent structure in the wound structure, i.e., the anode plate 1, the first separator 31, the cathode plate 2 and the second separator 32 in the first bent region B1 and the second bent region B2 are all bent, i.e., the surfaces of the anode plate 1, the first separator 31, the cathode plate 2 and the second separator 32 of each layer of the electrode assembly in the bent region are all curved, and the first bent region B1 and the second bent region B2 have a bending direction L, which may be understood as a direction along the surface of the electrode assembly in the bent region toward the straight region, for example, the bending direction L is along the winding direction of the wound structure in the bent region.

[0067] The surface of the positive electrode plate 1 has a positive electrode active material layer made of a positive electrode active material, and the surface of the negative electrode plate 2 has a negative electrode active material layer made of a negative electrode active material. For example, the negative electrode active material may be lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, or lithium nickel-cobalt-manganese oxide, and the positive electrode active material may be graphite or silicon.

[0068] When a lithium-ion battery is charged, lithium ions are released from the negative electrode and absorbed into the positive electrode. However, some abnormal situations may occur, such as when the lithium absorption space in the positive electrode is insufficient, the resistance of the positive electrode to absorb lithium ions is too large, or the release of lithium ions from the negative electrode is too fast, and the released lithium ions cannot be absorbed equally into the positive electrode active material layer of the positive electrode plate, and the lithium ions that cannot be absorbed into the positive electrode plate can only obtain electrons on the surface of the positive electrode, forming a silver-white metallic lithium element, which is the lithium deposition phenomenon. Lithium deposition not only reduces the performance of the lithium-ion battery and significantly shortens the cycle life, but also limits the fast charging capacity of the lithium-ion battery. In addition, when lithium deposition occurs in a lithium-ion battery, the activity of the deposited lithium metal is very high and can react with the electrolyte at a low temperature, causing a decrease in the self-heating onset temperature (Tonset) of the battery and an increase in the self-heating rate, which seriously impairs the safety of the battery. In addition, when lithium deposition is serious, the released lithium ions can form lithium crystals on the surface of the positive plate, and the lithium crystals are easy to break through the separator, causing the adjacent negative and positive plates to have a risk of short circuit. The adjacent negative and positive plates refer to a layer of negative plate and a layer of positive plate adjacent to each other in the electrode assembly, and no other layer of negative plate or other layer of positive plate is included between them. The separator adjacent to the negative plate 2 refers to a layer of negative plate 2 and a layer of separator adjacent to each other in the electrode assembly, and no other layer of separator or positive plate 1 is included between them. The separator adjacent to the positive plate 1 refers to a layer of positive plate 1 and a layer of separator adjacent to each other in the electrode assembly, and no other layer of separator or negative plate 2 is included between them.

[0069] In the research and development process, the inventors found that lithium deposition always occurs in the bending region of the electrode assembly, and through further research, the inventors found that the cause of the lithium deposition is the falling off of active material, the main reason being that the positive active material is applied to the surface of the positive plate, and the negative active material is applied to the surface of the negative plate, but the negative and positive plates located in the bending region need to be bent, which may cause the falling off of the respective active materials, which is called the powder falling off phenomenon, and in particular, the bending degree of the innermost electrode plate in the bending region is the largest, and the falling off of the active material is more likely to occur. The falling off of the active material, especially the falling off of the active material on the positive plate, may cause the lithium absorption sites of the positive active material layer of the positive plate to be less than the number of lithium ions that the negative active material layer of the adjacent negative plate can provide, so that the lithium deposition phenomenon is likely to occur when the lithium battery is charged.

[0070] In view of this, as shown in the flow chart of the electrode assembly processing method of an embodiment of the present application shown in Figure 3, the present application provides an electrode assembly processing method, the electrode assembly includes a negative electrode plate, a positive electrode plate, and a separator, the separator is for isolating the negative electrode plate and the positive electrode plate, the electrode assembly is formed by winding the negative electrode plate, the separator, and the positive electrode plate, the negative electrode plate includes a negative electrode active material layer, and the positive electrode plate includes a positive electrode active material layer. The method of this embodiment includes:

[0071] S04: Applying an adhesive to a predetermined portion of a surface of a coating member to form a blocking layer with the adhesive, the coating member including at least one of a negative electrode plate, a separator, and a positive electrode plate.

[0072] S05. Winding the cathode plate, the anode plate and the separator to form an electrode assembly, in which a blocking layer is located between adjacent anode active material layers and cathode active material layers after winding, and the blocking layer is for blocking the anode active material layer located on the other side of the blocking layer from absorbing at least a portion of the ions released from the cathode active material layer located on one side of the blocking layer.

[0073] By applying an adhesive to a predetermined portion of the surface of the member to be coated and forming a blocking layer with the adhesive, the blocking layer can be easily formed, which is advantageous for improving production efficiency. The predetermined portion corresponds to a portion of the positive electrode active material layer where lithium deposition is likely to occur, and at least a portion of the ions released from the negative electrode active material layer during charging is blocked by the blocking layer, and the ions blocked by the blocking layer cannot be released from the negative electrode active material layer or cannot be absorbed in the positive electrode active material layer adjacent to the negative electrode active material layer, thereby reducing the occurrence of lithium deposition in the portion of the positive electrode plate where lithium deposition is likely to occur, improving the safety performance of the battery cell, and improving the service life of the battery cell. The method of forming a blocking layer by applying an adhesive is easy to produce and process, and can improve production efficiency. The member to be coated may include at least one of a negative electrode plate, a separator, and a positive electrode plate.

[0074] As shown in FIG. 4, in another embodiment of the processing method of the present application, before step S04 of FIG. 3, which applies adhesive to a predetermined portion of the surface of the workpiece and forms a blocking layer with the adhesive, the method further includes the following:

[0075] S01, determine position information of a predetermined region based on a predetermined post-winding position, where the predetermined post-winding position is a position of a blocking layer in an electrode assembly after winding, the predetermined post-winding position is located between adjacent cathode active material layers and anode active material layers, and the position information of the predetermined region includes information for indicating a coating start position and a coating end position of the blocking layer.

[0076] In S02, the uncoated cathode plate 2, anode plate 1, first separator 31, and second separator 32 are wound together.

[0077] S03: Obtain winding data of the cathode plate, the separator, and the anode plate, and determine coating information based on the winding data and position information of preset portions.

[0078] Then, step S04 of applying adhesive to a predetermined portion of the surface of the member to be applied includes the following.

[0079] S041, adhesive is applied to a preset portion of a surface of a member to be coated based on application information.

[0080] Step S02 may be located before step S01, or may be located after step S01, or may be performed synchronously with step S01.

[0081] In some embodiments, in step S01, first, position information of the preset region is determined based on the preset post-winding position, and the preset post-winding position refers to a desired position in the electrode assembly after winding of the blocking layer, which corresponds to a region where lithium deposition in the positive electrode active material layer is likely to occur, for example, the preset post-winding position may be the bent regions B1, B2 of the electrode assembly after winding, or the preset post-winding position may be a combination of the bent regions B1, B2 and a part of the straight region A of the electrode assembly after winding. The preset post-winding position is located between adjacent negative and positive electrode active material layers.

[0082] In some embodiments, the position information of the preset portion includes information indicating a start position and an end position for application of the blocking layer.

[0083] In this embodiment, as shown in the schematic diagram of the electrode assembly unfolded in a flat state in Fig. 5, the position information of the preset portion may include a coating start length L1 and a coating end length L2 of the blocking layer 7. When the wound cathode plate 2, anode plate 1, first separator 31, and second separator 32 are generally unfolded in a flat state, the coating start length L1 of the blocking layer 7 is defined as the distance between the start point of the blocking layer 7 along the longitudinal direction of the coated member and the farthest winding start end of the cathode plate 2, anode plate 1, first separator 31, and second separator 32, and in some embodiments, it is the distance from the start point of the blocking layer 7 along the longitudinal direction of the coated member to the farthest winding start end 30 of the first separator 31 and second separator 32. The coating end length L2 of the blocking layer 7 is defined as the distance between the end point of the blocking layer 7 along the longitudinal direction of the coated member and the farthest winding start end of the blocking layer 7 of the blocking layer 7, the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32, when the wound cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 are spread out on the same plane, and in some embodiments, it is the distance from the end point of the blocking layer 7 along the longitudinal direction of the coated member to the farthest winding start end 30 of the first separator 31 and the second separator 32. The blocking layer 7 may be provided on one surface or two opposite surfaces of the coated member, and the blocking layer 7 may be provided on each surface in one segment or multiple segments. Therefore, the position information of the predetermined portion may include position information of each segment of the blocking layer 7 on each surface of the coated member. Figure 5 shows the expanded structure of the blocking layer 7 installed on the cathode plate 2. When the blocking layer 7 is installed on the anode plate 1, the first separator 31 or the second separator 32, the coating start length L1 and coating end length L2 of the blocking layer 7 may refer to the scheme in Figure 5.

[0084] Step S02 of this embodiment includes winding the uncoated cathode plate 2, anode plate 1, first separator 31, and second separator 32. In some embodiments, corresponding winding data is obtained to feed the starting ends of the uncoated cathode plate 2, anode plate 1, first separator 31, and second separator 32 into a winding machine. 2, in some embodiments, the positions of the winding starting end 20 of the cathode plate 2, the winding starting end 10 of the anode plate 1, and the winding starting ends 30 of the first separator 31 and the second separator 32 are not the same, and the lengths of the winding starting ends 30 of the first separator 31 and the second separator 32 are longer than the lengths of the winding starting end 20 of the cathode plate 2 and the winding starting end 10 of the anode plate 1, that is, before winding the cathode plate 2 and the anode plate 1, parts of the first separator 31 and the second separator 32 have already been wound. In some embodiments, the positions of the winding starting end 20 of the cathode plate 2 and the winding starting end 10 of the anode plate 1 are also not the same. However, the positions of the winding start ends of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 are not limited to those in the embodiments shown in FIG. 2 and FIG.

[0085] In step S03 of this embodiment, winding data of the member to be coated is acquired, and coating information is determined based on the winding data and position information of a preset portion.

[0086] In some embodiments, the winding data includes a winding line speed V of the coated member. The winding line speed V refers to the moving speed at which the coated member enters the entrance of the winding roller, and the winding line speed V may be a preset speed value, and in some embodiments, the winding line speed V may be a fixed value.

[0087] Accordingly, in this embodiment, the coating information includes a coating start time T1 and a coating end time T2. In some embodiments, when the blocking layer 7 is multi-segmented, the coating information includes coating information for each segment of the blocking layer 7. When the blocking layer 7 is provided on two different surfaces of the workpiece, the coating information includes coating information on each surface.

[0088] In this embodiment, the coating information is determined based on the winding data and the positional information of a predetermined portion, which means determining the coating start time T1 and the coating end time T2 based on the winding line speed V of the coating member and the coating start length L1 and coating end length L2 of the blocking layer 7.

[0089] The specific determination method is as follows: The coating start time T1 may be the time from the start of the winding operation to the start of coating the coated member, and in some embodiments, T1=L1 / V, that is, the coating start time T1 is equal to the ratio of the start length L1 of the blocking layer 7 on the surface of the coated member in the coating information to the winding line speed V. The coating end time T2 is determined by the length of the blocking layer 7 (the difference between the start length L1 and the end length L2), the winding line speed V of the coated member, and the coating length H of the coating mechanism, and in some embodiments, T2=T1+(L2-L1-H) / V, that is, the difference between the coating end time T2 and the coating start time T1 is the length of the blocking layer 7 minus the coating length H of the coating mechanism divided by the winding line speed V. The specific structure of the coating mechanism will be further described in the subsequent embodiments.

[0090] In step S04 of the above embodiment, the step S04 of applying adhesive to a preset portion of the surface of the member to be coated includes the following: S041, applying adhesive to a preset portion of the surface of the member to be coated based on application information.

[0091] In the above embodiment, when the coating information includes a coating start time T1 and a coating end time T2, step S041 is to perform coating on the member to be coated based on the coating start time T1 and the coating end time T2 to form a blocking layer 7 at a preset position after winding. In some embodiments, when the time reaches the coating start time T1, the coating mechanism applies adhesive to a preset position on the surface of the member to be coated, and when the time reaches the coating end time T2, the coating mechanism stops applying adhesive to the preset position on the surface of the member to be coated, and forms a blocking layer 7 of one segment at the preset position on the surface to be coated. When the blocking layer 7 has multiple segments on the surface of the member to be coated, the coating information includes multiple sets of coating start times T1 and coating end times T2, and multiple segments of blocking layer 7 are formed after the coating mechanism performs multiple coatings.

[0092] In some other embodiments, in step S01, the position information of the preset portion may include a coating start angle θ1 and a coating end angle θ2. The coating start angle θ1 is equal to the angle by which the winding mechanism is rotated when the start point of the blocking layer 7 reaches the coating mechanism. The coating end angle θ2 is equal to the angle by which the winding mechanism is rotated when the end point of the blocking layer 7 reaches the coating mechanism. In some embodiments, when the blocking layer 7 is a multi-segment layer, the position information of the preset portion includes position information of the preset portion of the blocking layer 7 of each segment. When the blocking layer 7 is provided on two different surfaces of the coated member, the information of the preset portion includes position information of the preset portion on each surface.

[0093] In this embodiment, in step S03, the winding data includes an overall winding angle θ of the cathode plate, the separator, and the anode plate, and defines that the overall winding angle θ is 0 when the farthest winding start end of the first separator 31 and the second separator 32 is wound by the winding mechanism. The specific structure of the coating mechanism will be described in the following embodiment. The overall winding angle θ continues to increase as the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 are continuously wound.

[0094] In this embodiment, the application information includes an application start signal and an application end signal.

[0095] In this embodiment, in step S03, determining the coating information based on the winding data and the position information of the predetermined portion means determining the coating start signal and the coating end signal based on the overall winding angle θ, the coating start angle θ1, and the coating end angle θ2.

[0096] A specific manner is as follows: when the overall winding angle θ reaches a coating start angle θ1, the coating information is a coating start signal, and when the overall winding angle θ reaches a coating end angle θ2, the coating information is a coating end signal. In some embodiments, when the blocking layer 7 is multi-segment, the coating information includes coating information of the blocking layer 7 of each segment. When the blocking layer 7 is provided on two different surfaces of the coated member, the coating information includes coating information on each surface.

[0097] In this embodiment, when the coating information includes a coating start signal and a coating end signal, step S041 is to perform coating on the member to be coated based on the coating start signal and the coating end signal, and form a blocking layer 7 at a preset position after winding. When the coating information is a coating start signal, the coating mechanism applies adhesive to a preset position on the surface of the member to be coated, and when the coating information is a coating end signal, the coating mechanism stops applying adhesive to the preset position on the surface of the member to be coated, and forms a blocking layer 7 of one segment at the preset position on the surface to be coated. When the blocking layer 7 has multiple segments on the surface of the member to be coated, the coating information includes multiple sets of coating start signals and coating end signals, and multiple segments of blocking layer 7 are formed on the member to be coated after multiple coatings are performed by the coating mechanism.

[0098] In the above embodiment, the uncoated cathode plate 2, anode plate 1, first separator 31, and second separator 32 are wound, and then the winding data is acquired. Based on the position of the preset portion, the application position of the blocking layer 7 is determined, so that the application of the blocking layer 7 can be automated and realized, and the blocking layer 7 after application is formed at a preset post-winding position after winding, which intentionally blocks ions at the preset post-winding position and reduces the occurrence of lithium deposition. The formation of the blocking layer 7 may be performed in synchronization with the winding operation, so that the application of the blocking layer 7 can be accurately realized.

[0099] In some embodiments, the pre-set post-winding positions are one or two surfaces of the cathode plate 2, and / or one or two surfaces of the anode plate 1, and / or one or two surfaces of the first separator 31, the second separator 32.

[0100] The predetermined post-winding position can be one or two surfaces of the negative electrode plate 2, and / or one or two surfaces of the positive electrode plate 1, and / or one or two surfaces of the first separator 31 and the second separator 32, thereby blocking some ions and reducing the occurrence of lithium deposition. The predetermined post-winding position can be a position where lithium deposition is likely to occur in the electrode assembly after winding, and by forming the blocking layer 7 at the predetermined post-winding position, the ions blocked by the blocking layer 7 cannot be absorbed by the positive electrode active material layer adjacent to the negative electrode active material layer, thereby reducing the occurrence of lithium deposition in the part of the positive electrode plate where lithium deposition is likely to occur, improving the safety performance of the battery cell, and improving the service life of the battery cell.

[0101] In some embodiments, the negative electrode plate 2, the first separator 31, the second separator 32, and the positive electrode plate 1 are wound to form a first bent region B1 and a second bent region B2, and at least a portion of the predetermined position after winding is located on the surface of at least one of the negative electrode plate 2, the positive electrode plate 1, the first separator 31, and the second separator 32 in the first bent region B1 and the second bent region B2. The degree of bending of the negative electrode plate 2 and the positive electrode plate 1 in the bent region is large, which makes it easier to cause the active material to fall off. The fall of the active material, especially the fall of the active material on the positive electrode plate 1, may cause the lithium absorption sites of the positive electrode active material layer of the positive electrode plate 1 to be less than the number of lithium ions that the negative electrode active material layer of the adjacent negative electrode plate 2 can provide, so that the lithium deposition phenomenon is likely to occur when the lithium battery is charged. Therefore, by placing the blocking layer 7 on the surface of at least one of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 in the first curved region B1 and the second curved region B2, the occurrence of lithium precipitation can be effectively suppressed.

[0102] 6 to 8, in another embodiment of the present application, the coated member is two surfaces of a cathode plate 2, and step S03 is to apply adhesive to predetermined portions of the two surfaces of the cathode plate 2, and form a blocking layer after the adhesive is cured. After performing step S05 of winding the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 to form an electrode assembly, the electrode assembly formed is as shown in FIG.

[0103] As shown in FIG. 6 , in one embodiment of the present application, the electrode assembly includes a straight region A, and a first bent region B1 and a second bent region B2 connecting both ends of the straight region. For the sake of simplicity, the electrode assembly of this embodiment is described as having a flat-body wound structure as an example. For example, the structures of the first bent region B1, the second bent region B2 and the straight region A of the flat-body wound structure may be as shown in FIG. 6 . FIG. 6 is a schematic diagram of a preset structure in the bent region of the electrode assembly of one embodiment of the present application. In the straight region A of the electrode assembly, the electrode assembly includes a cathode plate 2, an anode plate 1, and a first separator 31 and a second separator 32 for isolating the cathode plate 2 and the anode plate 1. Here, the first separator 31 and the second separator 32 may be independent from between the adjacent cathode plate 2 and anode plate 1, or may be applied to the surface of the cathode plate 2 or the anode plate 1. In another embodiment of the present application, one positive electrode plate 1, one separator 31, one negative electrode plate 2, and another separator 32 may be laminated and then wound or folded, or at least one (e.g., two or more) negative electrode plate 2, at least one (e.g., two or more) positive electrode plate 1, and at least two first separators 31 and second separators 32 (e.g., four or more, where the number of the first separators 31 and the second separators 32 is The number of layers (2 times the number of cathode plates 2 or anode plates 1) may be stacked and then wound or folded to form a first bent region B1 and a second bent region B2. When the electrode assembly has multiple layers of cathode plates 2, multiple layers of anode plates 1, and multiple layers of first separators 31 and second separators 32 in the first bent region B1 and the second bent region B2, the first bent region B1 and the second bent region B2 include a structure in which the cathode plates 2, separators 3, and anode plates 1 are alternately distributed. The predetermined position after winding is provided on one or two surfaces of the cathode plate 2, and / or on one or two surfaces of the anode plate 1, and / or on one or two surfaces of at least one of the two first separators 31 and the second separator 32. By such a placement, a blocking layer is included between at least one adjacent cathode plate 2 and anode plate 1.The adjacent cathode plate 2 and anode plate 1 in the first bent region B1 and the second bent region B2 refer to a layer of cathode plate 2 and a layer of anode plate 1 in the first bent region B1 and the second bent region B2 being adjacent to each other, and no other layer of cathode plate 2 or other layer of anode plate 1 is included between them. The separator adjacent to the cathode plate 2 refers to a layer of cathode plate 2 and a layer of separator in the electrode assembly being adjacent to each other, and no other layer of separator or anode plate 1 is included between them. The separator adjacent to the anode plate 1 refers to a layer of anode plate 1 and a layer of separator in the electrode assembly being adjacent to each other, and no other layer of separator or cathode plate 2 is included between them.

[0104] When the electrode assembly has a wound structure, the width direction of the cathode plate 2 and the anode plate 1 is parallel to the winding axis direction, and the width direction of the cathode plate 2 and the anode plate 1 is parallel to a direction perpendicular to the bending direction L. For ease of subsequent description, in this embodiment, the width direction of the cathode plate 2 and the anode plate 1, the direction perpendicular to the bending direction L, and the winding axis direction are collectively referred to as the K direction.

[0105] In some embodiments, the first bent region B1 and the second bent region B2 are formed by winding the cathode plate 2, the first separator 31, the second separator 32, and the anode plate 1. At least a part of the predetermined positions after winding is provided in the first bent region B1 and the second bent region B2 along at least one surface of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32. That is, at least a part of the blocking layer is coated on one or two surfaces of the cathode plate 2 located in the first bent region B1 and the second bent region B2, and / or is attached to one or two surfaces of the anode plate 1 located in the first bent region B1 and the second bent region B2, and / or is attached to one or two surfaces of at least one of the two separators located in the first bent region B1 and the second bent region B2.

[0106] In this embodiment, in the first bending region B1 and the second bending region B2, there is a large gap between the cathode plate 2 and the anode plate 1, and at least a part of the predetermined position after winding is provided in the first bending region B1 and the second bending region B2 along the surface of at least one of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32, that is, after winding, a blocking layer is provided in the first bending region B1 and the second bending region B2, and the bending degree of the cathode plate 2 and the anode plate 1 in the bending region is large, so that the active material is more easily removed. The removal of the active material, especially the removal of the active material on the anode plate 1, may cause the lithium absorption sites of the anode active material layer of the anode plate 1 to be less than the number of lithium ions that the adjacent cathode active material layer of the cathode plate 2 can provide, so that the lithium deposition phenomenon is likely to occur when the lithium battery is charged. To this end, by locating at least a portion of the predetermined post-winding position in the first bent region B1 or the second bent region B2 along the surface of at least one of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32, the occurrence of lithium precipitation can be effectively suppressed.

[0107] In another embodiment of the present application, both ends extending along the bending direction L at a preset position after winding are located in the first bending region B1 and the second bending region B2, i.e., all of the blocking layers are located in the first bending region B1 and the second bending region B2. In this embodiment, the electrode assembly further includes a straight region A connected to the first bending region B1 and the second bending region B2, the bending direction L points along the curved surfaces of the first bending region B1 and the second bending region B2 and toward the straight region A, and the direction perpendicular to the bending direction L points perpendicular to the bending direction L.

[0108] In another embodiment of the present application, one end of a preset position after winding, extending along a bending direction L, is located in the straight region A, and the other end is located in the first bending region B1 and the second bending region B2.

[0109] In another embodiment of the present application, in order to improve the lithium ion blocking properties of the curved region, the preset post-winding position has as large an area as possible in the first curved region B1 and the second curved region B2, for example, both ends of the preset post-winding position extending along the bending direction L are located in the straight region A, i.e., the blocking layer extends to the straight region A in addition to being located in the first curved region B1 and the second curved region B2.

[0110] In another embodiment of the present application, both ends extending along the bending direction L at a preset position after winding are located at the boundary between the first bent region B1, the second bent region B2 and the straight region A, or both ends extending along the bending direction L at a preset position after winding are close to the boundary between the first bent region B1, the second bent region B2 and the straight region A.

[0111] In some embodiments, at least a portion of the preset post-winding positions is located at the first bend portion 21 and / or the second bend portion 22 of the cathode plate 2 in the first bend region B1 and the second bend region B2, and / or at least a portion of the preset post-winding positions is located at the first bend portion 11 and / or the second bend portion 12 of the anode plate 1, and / or at least a portion of the preset post-winding positions is adjacent to the first bend portion 21 of the cathode plate 2. The positive electrode 1 is provided at a bending portion of the first separator 31, the second separator 32 adjacent to the bending portion 22, and / or at least a portion of the bending portion of the first separator 31, the second separator 32 adjacent to the bending portion 22, and / or at least a portion of the predetermined post-winding position is provided at a bending portion of the first separator 31, the second separator 32 adjacent to the first bending portion 11 of the positive electrode plate 1 and / or at a bending portion of the first separator 31, the second separator 32 adjacent to the second bending portion 12.

[0112] As shown in the embodiment in FIG. 6, at least a part of the preset post-winding positions may be set at bending positions of a preset number of bendings of at least one of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 in the first bending region B1 and the second bending region B2. In some embodiments, the preset post-winding positions are set at bending positions corresponding to at least the first and second bendings of at least one of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 in the first bending region B1 and the second bending region B2. The preset number of bendings described in this embodiment is the number of bendings arranged according to the order of bending in the process of winding the cathode plate 2, the first separator 31, the second separator 32, and the anode plate 1 from the inside to the outside to form an electrode assembly. Taking the embodiment of Figure 6 as an example, for the cathode plate 2, the position where the first blocking layer 721 is located is the inner and outer surfaces of the first bent portion 21 of the cathode plate 2, and the position where the second blocking layer 722 is located is the inner and outer surfaces of the second bent portion 22 of the cathode plate 2, that is, the predetermined position after winding includes the first bent portion 21 of the cathode plate 2 and the second bent portion 22 of the cathode plate 2, and an inference is made based on this. However, the preset number of times of bending of the cathode plate, the anode plate, and the separator is not limited to the first or second time, and any range of the number of times may be selected as necessary. For example, the preset position after winding may be set at a bending portion of the cathode plate 2 in the bending region that is the 1st to 4th, 1st to 6th, or 1st to 8th, or the 3rd to 4th, 3rd to 6th, or 3rd to 8th, or another range of the number of times; and / or the preset position after winding may be set at a bending portion of the anode plate 1 in the bending region that is the 1st to 4th, 1st to 6th, or 1st to 8th, or the 3rd to 4th, 3rd to 6th, or 3rd to 8th, or another range of the number of times; and / or the preset position after winding may be set at a bending portion of the first separator 31 and / or the second separator 32 in the bending region that is the 1st to 4th, 1st to 6th, or 1st to 8th, or the 3rd to 4th, 3rd to 6th, or 3rd to 8th, or another range of the number of times.

[0113] In this embodiment, the predetermined post-winding position is set at a bending portion of a predetermined number of bendings of at least one of the cathode plate 2, the anode plate 1, and the separators 31 and 32, so that a blocking layer can be formed at the bending portion of the predetermined number of bendings where lithium deposition between the cathode plate 2 and the anode plate 1 is most serious. For example, a blocking layer is formed at the first and second bending portions where the curvature is the largest, blocking lithium ions at the first and second bending portions where the curvature is the largest, and no lithium ions or only a small portion of the lithium ions are absorbed in the portion of the anode plate where the curvature is the largest, thereby reducing the occurrence of the lithium deposition phenomenon.

[0114] The embodiment shown in Fig. 7 is a structural schematic diagram of the cathode plate 2 in Fig. 6 unfolded. The cathode plate 2 includes a cathode body portion 21 and at least one cathode tab portion 213 extending out of the cathode body portion 21 along the K direction, and at least a part of the surface area of ​​the cathode body portion 21 is a cathode active material area 212, and a cathode active material may be applied to the cathode active material area 212, for example, the cathode active material may be a ternary material, lithium manganese oxide, or lithium iron phosphate.

[0115] In another embodiment of the present application, the surface of the cathode main body portion 21 further includes a first insulating layer coated region 211 adjacent to the cathode active material region 212, the first insulating layer coated region 211 is located on a side of the cathode active material region 212 close to the cathode tab portion 213, and the first insulating layer coated region 211 is for coating an insulating material and for insulating and isolating the cathode active material region 212 and the cathode tab portion 213. For example, what is shown in FIG. 7 is a schematic cross-sectional structure diagram along the E-E direction in FIG. 6, in which two surfaces of the current collector 210 of the cathode plate 2 have the cathode active material regions 212, and the cathode tab portion 213 is a part of the current collector 210 of the cathode plate 2, and here, the material of the current collector 210 may be aluminum.

[0116] For example, the cathode active material region 212 and the first insulating layer coated region 211 are distributed on the surface of the cathode main body portion 21 at both ends along the width direction (i.e., direction K) of the cathode main body portion 21, and the cathode tab portion 213 and the first insulating layer coated region 211 belong to the same end of the cathode main body portion 21.

[0117] In another embodiment of the present application, the cathode active material region 212 and the first insulating layer coated region 211 are two approximately parallel regions on the surface of the cathode body portion 21, and are distributed in two layers on the surface of the cathode body portion 21 along the K direction.

[0118] In another embodiment of the present application, the first insulating layer applied region 211 may be located in a portion where the cathode main body portion 21 and the cathode tab portion 213 are connected to each other, for example, the first insulating layer applied region 211 is located in a portion on the surface of the cathode main body portion 21 where the cathode tab portion 213 and the cathode tab portion 213 are connected to each other, and is for separating the surface of the cathode tab portion 213 from the cathode active material region 212. In another embodiment of the present application, not only is the first insulating layer applied region 211 provided on the surface of the cathode main body portion 21, but a second insulating layer applied region is also provided in a root region of the cathode tab portion 213 close to the cathode main body portion 21, and the second insulating layer applied region is for applying an insulating material.

[0119] In another embodiment of the present application, an insulating material is applied to the surface of the first insulating layer application region 211, and the insulating material includes an inorganic filler and an adhesive. The inorganic filler includes one or more of boehmite, alumina, magnesium oxide, titanium dioxide, zirconium oxide, silica, silicon carbide, boron carbide, calcium carbonate, aluminum silicate, calcium silicate, potassium titanate, and barium sulfate. The adhesive includes one or more of polyvinylidene fluoride, polyacrylonitrile, polyacrylic acid, polyacrylic acid ester, polyacrylic acid-acrylic acid ester, polyacrylonitrile-acrylic acid, and polyacrylonitrile-acrylic acid ester.

[0120] In another embodiment of the present application, each cathode plate 2 may include one or two or more cathode tab portions 213, and when the cathode plate 2 includes two or more cathode tab portions 213, all of the cathode tab portions 213 are located on the same side of the cathode plate 2 along the K direction.

[0121] Fig. 8 is a schematic cross-sectional structure diagram along the CC direction in Fig. 7, and referring to Fig. 7 in combination, the blocking layer 721 is applied on the surface of the negative electrode active material region 212, i.e., on at least one surface of the negative electrode plate 2 attached to the surface of the negative electrode active material layer, to block the passage of a large amount of lithium ions and reduce the occurrence of lithium deposition. In Fig. 8, the blocking layer 721 is provided on two surfaces of each negative electrode plate 2, i.e., the blocking layer 721 is applied to both negative electrode active material regions 212 on the two surfaces of the negative electrode plate 2.

[0122] In some embodiments, the adhesive of the blocking layer includes at least one of polyacrylic acid / acrylic acid ester, butylbenzene, phenylpropyl, ethylene-vinyl acetate copolymer, polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy adhesives, silicone adhesives, polyurethane adhesives, styrene-isoprene-styrene copolymer adhesives, and modifications of the above materials.

[0123] In the above examples, the positional relationship between the blocking layer and each of the cathode plate, anode plate, and separator, and the structural features of the blocking layer are merely briefly described. In order to clarify the positional relationship between the blocking layer and each of the cathode plate, anode plate, and separator, and the structural features of the blocking layer, several electrode assemblies having a wound structure are described in detail below.

[0124] In another embodiment shown in FIG. 9, the relevant technical features of the anode plate 1, the cathode plate 2, the first separator 31, the second separator 32 and the blocking layers 721, 722 of this embodiment may refer to the description of the embodiment corresponding to FIGS. 6 to 8, and will not be further described here.

[0125] 9 is different from the embodiment of FIG 6 in that the preset post-winding positions include the inner surface of the first bent portion 21 of the cathode plate 2 and the inner surface of the second bent portion 22 of the cathode plate 2. That is, the first blocking layer 721 formed after winding is disposed on the inner surface of the first bent portion 21 of the cathode plate 2, and the second blocking layer 722 is disposed on the inner surface of the second bent portion 22 of the cathode plate 2.

[0126] In another embodiment of the present application, shown in FIG. 10 is a schematic diagram of the DD cross-sectional structure of the cathode plate 2 in FIG. 9. The difference between the embodiment of FIG. 10 and the embodiment of FIG. 7 is that a blocking layer 721 is provided on the surface of the cathode active material region 212 on the inner surface of the cathode plate 2. The specific structure, attachment method and position of the blocking layer 721 are the same as those in FIG. 7. In some other embodiments, the predetermined position after winding may be located on one or two surfaces of the anode plate 1, the first separator 31, and the second separator 32, that is, a blocking layer is formed on one or two surfaces of the anode plate 1, the first separator 31, and the second separator 32, and the specific structure, attachment method and position of the blocking layer are the same as those of the cathode plate 2, and specifically, the structures of FIG. 6 to FIG. 10 may be referred to.

[0127] In another embodiment shown in FIG. 11, the relevant technical features of the anode plate 1, the cathode plate 2, the first separator 31, and the second separator 32 of this embodiment may refer to the description of the embodiment corresponding to FIGS. 6 to 10, and will not be further described here.

[0128] 11 and 6, the preset positions after winding include the outer surface of the first bent portion 11 of the anode plate 1, the outer surface of the second bent portion 12 of the anode plate 1, the inner surface of the third bent portion 13 of the anode plate 1, and the inner surface of the fourth bent portion 14 of the anode plate 1. That is, the first blocking layer 711 formed after winding is disposed on the outer surface of the first bent portion 11 of the anode plate 1, the second blocking layer 712 is disposed on the outer surface of the second bent portion 12 of the anode plate 1, the third blocking layer 713 is disposed on the inner surface of the third bent portion 13 of the anode plate 1, and the fourth blocking layer 714 is disposed on the inner surface of the fourth bent portion 14 of the anode plate 1.

[0129] The structure of the anode plate 1 may be as shown in FIG. 12 , which is a structural schematic diagram of the anode plate 1 in one embodiment of the present application, where the anode plate 1 includes an anode main body portion 11 and an anode tab portion 113 extending outward from the anode main body portion 11 along the K direction, and at least a portion of an area along the K direction on the surface of the anode main body portion 11 is an anode active material area 112, which is for applying an anode active material, and the anode active material may be graphite or silicon.

[0130] In another embodiment of the present application, not only is a positive electrode active material region 112 provided in a portion of the surface of the positive electrode main body portion 11, but also a positive electrode active material region 112 is provided in a root region on the surface of the positive electrode tab portion 113 and adjacent to the positive electrode main body portion 11, i.e., a portion of the surface of the positive electrode tab portion 113 is a positive electrode active material region 112.

[0131] In another embodiment of the present application, the anode active material region 112 covers the entire surface of the anode body 11 along the direction K, as shown in FIG.

[0132] In another embodiment of the present application, the positive electrode active material may not cover the entire surface of the positive electrode plate 1 .

[0133] 13 is a schematic cross-sectional structure diagram along the EE direction in FIG. 12. Referring to FIG. 12 in conjunction, the pre-installed position after winding is one surface of the anode plate 1, that is, the blocking layer 711 is applied to one surface of the anode plate 1, that is, the positive electrode active material region 112 on one surface. By applying a blocking layer to at least one surface of the anode plate 1, it is possible to block the passage of a large amount of lithium ions and reduce the occurrence of lithium deposition.

[0134] In another embodiment shown in FIG. 14, the relevant technical features of the anode plate 1, the cathode plate 2, the first separator 31, and the second separator 32 of this embodiment may refer to the description of the embodiment corresponding to FIGS. 11 to 13, and will not be further described here.

[0135] 14 is different from the embodiment of FIG 11 in that the preset position after winding includes the outer surface of the first bent portion 11 of the anode plate 1 and the outer surface of the second bent portion 12 of the anode plate 1. That is, the first blocking layer 711 formed after winding is disposed on the outer surface of the first bent portion 11 of the anode plate 1, and the second blocking layer 712 is disposed on the outer surface of the second bent portion 12 of the anode plate 1.

[0136] The difference between the cross-sectional structure schematic diagram of the anode plate of another embodiment shown in Figure 15 and the embodiment of Figure 13 is that the preset positions after winding are two opposite surfaces of the anode plate 1, i.e., blocking layers 711 are applied on two opposite surfaces of the anode plate 1, i.e., on the two opposite surfaces of the anode active material layers 112. By applying blocking layers on two surfaces of the anode plate 1, it is possible to block the passage of a large amount of lithium ions and reduce the occurrence of lithium deposition.

[0137] In another embodiment of the present application, both ends extending along the bending direction L at a preset position after winding are both located in the first bending region B1 and the second bending region B2 of the anode plate 1, i.e., all of the blocking layers are both located in the first bending region B1 and the second bending region B2 of the anode plate 1. In this embodiment, the electrode assembly further includes a straight region A connected to the first bending region B1 and the second bending region B2, the bending direction L points along the curved surfaces of the first bending region B1 and the second bending region B2 and toward the straight region A, and the direction perpendicular to the bending direction L points perpendicular to the bending direction L.

[0138] In another embodiment of the present application, one end extending along the bending direction L of a predetermined post-winding position is located in a straight region A of the anode plate 1, and the other end is located in a first bending region B1 and a second bending region B2 of the anode plate 1.

[0139] In another embodiment of the present application, in order to improve the lithium ion blocking property of the bent region, the preset post-winding position has as large an area as possible in the first bent region B1 and the second bent region B2, for example, both ends extending along the bending direction L of the preset post-winding position are located in the straight region A of the anode plate 1, that is, the blocking layer extends to the straight region A of the anode plate 1 in addition to being located in the first bent region B1 and the second bent region B2 of the anode plate 1.

[0140] In another embodiment of the present application, both ends extending along the bending direction L at a preset position after winding are located at the boundary between the first bent region B1, the second bent region B2 and the straight region A of the anode plate 1, or both ends extending along the bending direction L at a preset position after winding are close to the boundary between the first bent region B1, the second bent region B2 and the straight region A of the anode plate 1.

[0141] In another embodiment shown in FIG. 16, the relevant technical features of the anode plate 1, the cathode plate 2, the first separator 31, and the second separator 32 of this embodiment may refer to the description of the embodiment corresponding to FIGS. 6 to 15, and will not be further described here.

[0142] The first separator 31 and the second separator 32 have electronic insulation properties, are for isolating the adjacent cathode plate 2 and anode plate 1, and preventing the adjacent cathode plate 2 and anode plate 1 from short-circuiting. The separator 3 has a large number of through micropores, can ensure the free passage of electrolyte ions, and has excellent permeability to lithium ions, so that the separator 3 can hardly block the passage of lithium ions. For example, the separator 3 includes a separator base layer and a functional layer located on the surface of the separator base layer, and the separator base layer may be at least one of polypropylene, polyethylene, ethylene-propylene copolymer, polybutylene terephthalate, etc., and the functional layer may be a mixture layer of ceramic oxide and adhesive.

[0143] 16 and 6 is that the preset positions after winding include the inner surface of the first bent portion 311 of the first separator 31, the inner surface of the second bent portion 312 of the first separator 31, the inner surface of the first bent portion 321 of the second separator 32, and the inner surface of the second bent portion 322 of the second separator 32. That is, the first blocking layer 7311 formed after winding is disposed on the inner surface of the first bent portion 311 of the first separator 31, the second blocking layer 7312 is disposed on the inner surface of the second bent portion 312 of the first separator 31, the third blocking layer 7321 is disposed on the inner surface of the first bent portion 321 of the second separator 32, and the fourth blocking layer 7322 is disposed on the inner surface of the second bent portion 322 of the second separator 32.

[0144] By providing a blocking layer on the inner surface of the first bent portion and the second bent portion of the first separator 31 and the second separator 32, respectively, it is possible to block the passage of at least some of the lithium ions, thereby reducing the occurrence of the lithium precipitation phenomenon.

[0145] Shown in Figure 17 is a schematic diagram of the FF cross-sectional structure of the anode plate in Figure 16, and it is clear that the first blocking layer 7311 formed after winding is installed on the inner surface of the first bent portion 311 of the first separator 31.

[0146] As shown in FIG. 18 , in another embodiment of the present application, the difference from the embodiment of FIG. 16 is that the preset post-winding positions include the outer surface of the first bend region 311 of the first separator 31, the outer surface of the second bend region 312 of the first separator 31, the outer surface of the first bend region 321 of the second separator 32, and the outer surface of the second bend region 322 of the second separator 32. That is, the first blocking layer 7311 formed after winding is positioned on the outer surface of the first bent portion 311 of the first separator 31, the second blocking layer 7312 is positioned on the outer surface of the second bent portion 312 of the first separator 31, the third blocking layer 7321 is positioned on the outer surface of the first bent portion 321 of the second separator 32, and the fourth blocking layer 7322 is positioned on the outer surface of the second bent portion 322 of the second separator 32.

[0147] As shown in FIG. 19 , in another embodiment of the present application, the difference from the embodiment of FIG. 16 is that the preset post-winding positions include the inner and outer surfaces of the first bend portion 311 of the first separator 31, the inner and outer surfaces of the second bend portion 312 of the first separator 31, the inner and outer surfaces of the first bend portion 321 of the second separator 32, and the inner and outer surfaces of the second bend portion 322 of the second separator 32. That is, the first blocking layer 7311 formed after winding is positioned on the inner and outer surfaces of the first bent portion 311 of the first separator 31, the second blocking layer 7312 is positioned on the inner and outer surfaces of the second bent portion 312 of the first separator 31, the third blocking layer 7321 is positioned on the inner and outer surfaces of the first bent portion 321 of the second separator 32, and the fourth blocking layer 7322 is positioned on the inner and outer surfaces of the second bent portion 322 of the second separator 32.

[0148] Shown in Figure 20 is a schematic diagram of the GG cross-sectional structure of the anode plate in Figure 19, and it is clear that the first blocking layer 7311 formed after winding is installed on the inner and outer surfaces of the first bent portion 311 of the first separator 31.

[0149] 21, in another embodiment of the present application, both ends extending along the bending direction L at a preset position after winding are located in the first bending region B1 and the second bending region B2 of the first separator 31 and the second separator 32, i.e., all of the blocking layers 7311, 7312, 7321, and 7322 are located in the first bending region B1 and the second bending region B2 of the first separator 31 and the second separator 32. In this embodiment, the electrode assembly further includes a straight region A connected to the first bending region B1 and the second bending region B2, and the bending direction L is a direction along the curved surfaces of the first bending region B1 and the second bending region B2 and toward the straight region A, and a direction perpendicular to the bending direction L is a direction perpendicular to the bending direction L.

[0150] In another embodiment of the present application, one end extending along the bending direction L at a preset post-winding position is located in the straight region A of the first separator 31 and the second separator 32, and the other end is located in the first bending region B1 and the second bending region B2 of the first separator 31 and the second separator 32.

[0151] In another embodiment of the present application, in order to improve the lithium ion blocking properties of the curved region, the predetermined post-winding position has as large an area as possible in the first curved region B1 and the second curved region B2, for example, both ends extending along the bending direction L of the predetermined post-winding position are located in the straight region A of the first separator 31 and the second separator 32, i.e., the blocking layer extends to the straight region A of the first separator 31 and the second separator 32 in addition to being located in the first curved region B1 and the second curved region B2 of the first separator 31 and the second separator 32.

[0152] In another embodiment of the present application, both ends extending along the bending direction L at a preset position after winding are located at the boundary between the first bent region B1, the second bent region B2, and the straight region A of the first separator 31 and the second separator 32, or both ends extending along the bending direction L at a preset position after winding are close to the boundary between the first bent region B1, the second bent region B2, and the straight region A of the first separator 31 and the second separator 32.

[0153] 22, in another embodiment of the present application, the difference from the embodiment of FIG. 16 is that the preset post-winding positions include the inner surface of the first bent portion 311 of the first separator 31 and the inner surface of the second bent portion 312 of the first separator 31. That is, the first blocking layer 7311 formed after winding is disposed on the inner surface of the first bent portion 311 of the first separator 31, and the second blocking layer 7312 is disposed on the inner surface of the second bent portion 312 of the first separator 31. That is, an inhibition layer is provided on the inner surface of the first bent portion 311 of the first separator 31 between the first bent portion 21 of the cathode plate 2 and the first bent portion 11 of the anode plate 1, and on the inner surface of the second bent portion 312 of the first separator 31 between the second bent portion 22 of the cathode plate 2 and the second bent portion 12 of the anode plate 1, and no inhibition layer is provided on the second separator 32.

[0154] In some other embodiments, the predetermined post-winding position may include the outer surface of the first bent portion 311 of the first separator 31 and the outer surface of the second bent portion 312 of the first separator 31.

[0155] As shown in FIG. 23 , in another embodiment of the present application, the difference from the embodiment of FIG. 16 is that the preset post-winding positions include the inner and outer surfaces of the first bent portion 311 of the first separator 31 and the inner and outer surfaces of the second bent portion 312 of the first separator 31.

[0156] In some embodiments, the method of applying the adhesive to the predetermined area on the surface of the workpiece includes press application, roller application, or spray application.

[0157] As shown in FIG. 24, an embodiment of the second aspect of the present application provides an electrode assembly processing apparatus 100. The electrode assembly includes a cathode plate 2, an anode plate 1, a first separator 31, and a second separator 32, where the first separator 31 and the second separator 32 are for isolating the cathode plate and the anode plate, and the electrode assembly is formed by winding the cathode plate 2, the first separator 31, the second separator 32, and the anode plate 1, where the cathode plate 2 includes a cathode active material layer, and the anode plate 1 includes a cathode active material layer. The structure of the electrode assembly may refer to the structure of the electrode assembly shown in the embodiments of FIG. 6 to FIG. 23. The processing apparatus 100 of this embodiment includes a coating mechanism 5 and a winding mechanism 4. Here, the application mechanism 5 is for applying adhesive to a predetermined portion of the surface of the member to be coated and forming a blocking layer with the adhesive, and the member to be coated includes at least one of the cathode plate 2, the first separator 31, the second separator 32, and the anode plate 1, and the winding mechanism 4 is for winding the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32 to form an electrode assembly, and the application mechanism is located upstream of the winding mechanism, and the blocking layer is located between adjacent cathode active material layers and anode active material layers after winding, and the blocking layer is for blocking the anode active material layer located on the other side of the blocking layer in which at least a portion of the ions released from the cathode active material layer located on one side of the blocking layer have been absorbed after winding.

[0158] The electrode assembly processing device of this embodiment can apply adhesive to a predetermined portion of the surface of the workpiece, and form a blocking layer by the adhesive, thereby efficiently and accurately applying the blocking layer. The predetermined portion corresponds to a portion of the positive electrode active material layer where lithium deposition is likely to occur, and at least a portion of the ions released from the negative electrode active material layer during charging are blocked by the blocking layer, and the ions blocked by the blocking layer cannot be absorbed by the positive electrode active material layer adjacent to the negative electrode active material layer, thereby reducing the occurrence of lithium deposition in the portion of the positive electrode plate where lithium deposition is likely to occur, improving the safety performance of the battery cell, and improving the service life of the battery cell. The method of forming a blocking layer by applying adhesive is easy to produce and process, and can improve production efficiency.

[0159] 25, the processing apparatus 110 of another embodiment of the present application further includes a position information determining unit 81, a winding control unit 82, an acquisition unit 83, a coating information determining unit 84, and a coating control unit 85. Here, the position information determining unit 81 is for determining position information of a preset portion based on a preset position after winding, and transmitting it to the coating information determining unit 84, where the preset position after winding is a position in the electrode assembly after winding of the blocking layer, the preset position after winding is located between the adjacent cathode active material layer and anode active material layer, and the position information of the preset portion includes information for indicating a coating start position and a coating end position of the blocking layer. The winding control unit 82 is for controlling the winding mechanism 4 to wind the uncoated cathode plate 2, anode plate 1, first separator 31, and second separator 32, the acquisition unit 83 is for acquiring winding data of the cathode plate 2, the first separator 31, the second separator 32, and the anode plate 1 and transmitting it to the application information confirmation unit 84, the application information confirmation unit 84 is for confirming the application information based on the winding data and position information of a predetermined portion, and the application control unit 85 is for controlling the application mechanism 5 to apply adhesive to the surface of the member to be applied based on the application information.

[0160] In this embodiment, the acquisition unit 83 may be a position sensor, a Hall sensor, etc. The position information determination unit 81, the winding control unit 82, the coating information determination unit 84, and the coating control unit 85 may be components having control and calculation functions such as controllers in power consumption devices. It should be noted that in this embodiment, the position information determination unit 81, the winding control unit 82, the coating information determination unit 84, and the coating control unit 85 may be integrated into one chip, the winding control unit 82 may be an independent chip, and the position information determination unit 81, the coating information determination unit 84, and the coating control unit 85 may be integrated into one chip, or the winding control unit 82 may be an independent chip, and the position information determination unit 81, the coating information determination unit 84, and the coating control unit 85 may be installed on a circuit board as three circuit modules, respectively.

[0161] In some embodiments, the winding data includes a winding line speed V of the coated member, the position information of the predetermined portion includes a coating start length L1 and a coating end length L2 of the blocking layer, and the coating information includes a coating start time T1 and a coating end time T2.

[0162] Accordingly, in this embodiment, the operation manner of the position information determining unit 81, the winding control unit 82, the obtaining unit 83, the application information determining unit 84 and the application control unit 85 is as follows:

[0163] The position information determination unit 81 determines the coating start length L1 and coating end length L2 of the blocking layer based on the preset position after winding, and sends them to the coating information determination unit. For a specific method of determining the coating start length L1 and coating end length L2 of the blocking layer based on the preset position after winding, refer to the determination method in the above method claim. The coating start length L1 and coating end length L2 of the blocking layer may be calculated by the position information determination unit 81 based on the preset position after winding, or may be obtained by a user inputting the coating start length L1 and coating end length L2 of the blocking layer into the position information determination unit 81.

[0164] The winding control unit 82 is for controlling the winding mechanism 4 to wind the uncoated cathode plate 2, anode plate 1, first separator 31, and second separator 32.

[0165] The acquisition unit 83 acquires the winding line speed V of the workpiece and transmits it to the application information determination unit 84.

[0166] The coating information determination unit 84 is for determining coating information based on the winding data and the position information of a predetermined portion, and in some embodiments, includes the coating information determination unit 84 determining the coating start time T1 and the coating end time T2 based on the winding line speed V of the coated member and the coating start length L1 and the coating end length L2 of the blocking layer.

[0167] The coating control unit 85 performs coating on the coated member based on the coating start time T1 and the coating end time T2, and forms a blocking layer located at a preset position after winding. In this embodiment, specific methods and specific methods corresponding to the above method claims may be referred to.

[0168] In some other embodiments, the winding data includes an overall winding angle θ of the cathode plate 2, the first separator 31, the second separator 32 and the anode plate 1, the position information of the preset portion includes a coating start angle θ1 and a coating end angle θ2 of the blocking layer, and the coating information includes a coating start signal and a coating end signal.

[0169] Accordingly, in this embodiment, the specific operation manner of the position information determining unit 81, the winding control unit 82, the obtaining unit 83, the application information determining unit 84 and the application control unit 85 is as follows:

[0170] The position information determination unit 81 determines the coating start angle θ1 and coating end angle θ2 of the blocking layer based on the preset position after winding, and transmits them to the coating information determination unit. The method of determining the coating start angle θ1 and coating end angle θ2 of the blocking layer based on the preset position after winding may refer to the determination method in the above method claim. The coating start angle θ1 and coating end angle θ2 of the blocking layer may be calculated by the position information determination unit 81 based on the preset position after winding, or may be obtained by a user inputting the preset coating start angle θ1 and coating end angle θ2 of the blocking layer into the position information determination unit 81.

[0171] The winding control unit 82 is for controlling the winding mechanism 4 to wind the uncoated cathode plate 2, anode plate 1, first separator 31, and second separator 32.

[0172] The acquisition unit 83 acquires the overall winding angle θ of the cathode plate 2, the first separator 31, the second separator 32 and the anode plate 1, and transmits it to the coating information determination unit 84.

[0173] The coating information determination unit 84 is for determining coating information based on the winding data and the position information of a preset portion, and in some embodiments, the coating information determination unit 84 includes determining a coating start signal and a coating end signal based on the overall winding angle θ of the cathode plate, the separator and the anode plate, a coating start angle θ1 and a coating end angle θ2.

[0174] The coating control unit 85 performs coating on the coated member based on the coating start signal and the coating end signal, and forms a blocking layer located at a preset position after winding. In this embodiment, specific methods and specific methods corresponding to the above-mentioned method claims may be referred to.

[0175] In some embodiments, the pre-set post-winding positions are one or two surfaces of the cathode plate 2, and / or one or two surfaces of the anode plate 1, and / or one or two surfaces of the first separator 31, the second separator 32.

[0176] The predetermined post-winding position can be one or two surfaces of the negative electrode plate 2, and / or one or two surfaces of the positive electrode plate 1, and / or one or two surfaces of the first separator 31 and the second separator 32, thereby blocking some ions and reducing the occurrence of lithium deposition. The predetermined post-winding position can be a position where lithium deposition is likely to occur in the electrode assembly after winding, and by forming a blocking layer at the predetermined post-winding position, the ions blocked by the blocking layer cannot be absorbed by the positive electrode active material layer adjacent to the negative electrode active material layer, thereby reducing the occurrence of lithium deposition in the part of the positive electrode plate where lithium deposition is likely to occur, improving the safety performance of the battery cell, and improving the service life of the battery cell.

[0177] In some embodiments, the first bent region B1 and the second bent region B2 are formed by winding the cathode plate 2, the first separator 31, the second separator 32, and the anode plate 1. At least a part of the predetermined positions after winding is provided in the first bent region B1 and the second bent region B2 along the surface of at least one of the cathode plate 2, the anode plate 1, the first separator 31, and the second separator 32.

[0178] In some embodiments, at least a portion of the preset post-winding positions is located at the first bend portion 21 and / or the second bend portion 22 of the cathode plate 2 in the first bend region B1 and the second bend region B2, and / or at least a portion of the preset post-winding positions is located at the first bend portion 11 and / or the second bend portion 12 of the anode plate 1, and / or at least a portion of the preset post-winding positions is adjacent to the first bend portion 21 of the cathode plate 2. The positive electrode 1 is provided at a bending portion of the first separator 31, the second separator 32 adjacent to the bending portion 22, and / or at least a portion of the bending portion of the first separator 31, the second separator 32 adjacent to the bending portion 22, and / or at least a portion of the predetermined post-winding position is provided at a bending portion of the first separator 31, the second separator 32 adjacent to the first bending portion 11 of the positive electrode plate 1 and / or at a bending portion of the first separator 31, the second separator 32 adjacent to the second bending portion 12.

[0179] In this embodiment, the setting manner of the preset position after winding may refer to the setting manner in the embodiment of the method, specifically, the embodiment in FIG. 6 to FIG. 23 may be referred to.

[0180] In some embodiments, the adhesive may include at least one of polyacrylic acid / acrylates, butylbenzene, phenylpropyl, ethylene-vinyl acetate copolymers, polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy adhesives, silicone adhesives, polyurethane adhesives, styrene-isoprene-styrene copolymer adhesives, and modifications of the foregoing materials.

[0181] The processing apparatus of this embodiment will be specifically described below with reference to the drawings.

[0182] FIG. 26 shows a processing device 111 of one embodiment, which includes a winding mechanism 4 and a coating mechanism 51. The winding mechanism 4 winds the anode plate 1, the first separator 31, the cathode plate 2, and the second separator 32 to form an electrode assembly, and the coating mechanism 51 is located upstream of the winding mechanism and applies adhesive to a preset portion of the surface of the coated member to form a blocking layer with the adhesive. In this embodiment, the coated member is the first separator 31 and the second separator 32, and the coating mechanism 51 is installed on both the first separator 31 and the second separator 32. However, the present invention is not limited to this, and the coated member may be the anode plate 1 and / or the cathode plate 2.

[0183] In some embodiments, the processing device 111 further includes a plurality of pass rollers 6 respectively installed on the anode plate 1, the first separator 31, the cathode plate 2, and the second separator 32 for tensioning the anode plate 1, the first separator 31, the cathode plate 2, and the second separator 32.

[0184] In some embodiments, the winding mechanism 4 is a roll pin, and the winding direction of the winding mechanism 4 is the R1 direction. The overall winding angle θ of the cathode plate, the separator, and the anode plate in the above embodiments is the winding angle of the winding mechanism 4.

[0185] As shown in FIG. 27, in some embodiments, the application mechanism 51 is for applying adhesive to a predetermined portion of the surface of the member to be applied to form an inhibition layer, and the application mechanism 51 includes an adhesive application section 511 for applying adhesive to a predetermined portion of the surface of the member to be applied, an adhesive supply mechanism (not shown) for providing adhesive to the adhesive application section, and a drive mechanism 512 for driving the adhesive application section to press against or away from the surface of the member to be applied, wherein the drive mechanism 512 is connected in communication with the application control unit 85.

[0186] In some embodiments, the adhesive applicator 511 includes an adhesive applicator roller 5111, and an adhesive layer 5112 is applied in the circumferential direction of the adhesive applicator roller 5111. The adhesive layer 5112 is connected to an adhesive supply mechanism, and the adhesive applicator roller 5111 is rotatably installed and connected to a driving mechanism. When the adhesive applicator is moved by the driving mechanism 512 to press against the surface of the member to be coated, the adhesive layer 5112 on the surface of the adhesive applicator roller comes into contact with the surface of the member to be coated, rolls along the surface of the member to be coated, applies the adhesive to a predetermined portion of the surface of the member to be coated, and forms a blocking layer after the adhesive is cured. After the adhesive is applied to all the predetermined portions, the adhesive applicator 511 is moved by the driving mechanism 512 to move away from the surface of the member to be coated, and coating is completed.

[0187] In some embodiments, the driving mechanism 512 includes a driving unit 5122 and a swing arm 5121, and the driving unit 5122 is connected to one end of the swing arm and drives the swing arm 5121 to swing around the R2 direction. Any mechanism suitable for driving the swing of the swing arm 5121, such as a structure of a motor + gear train or a motor + eccentric wheel, may be adopted as the driving unit. One end of the swing arm 5121 is rotatably connected to the driving unit, and the other end is rotatably connected to the adhesive application roller 5111. The swing arm 5121 is driven by the driving unit 5122 to move the adhesive application part 511.

[0188] The driving mechanism 512 includes two sets of swing arms 5121 and an adhesive applicator 511, the workpiece passes through the middle between the two sets of swing arms 5121 and the adhesive applicator 511, and two surfaces of the workpiece correspond to one set of swing arms 5121 and the adhesive applicator 511, respectively. The two sets of swing arms 5121 and the adhesive applicator 511 may be jointly driven by one driving unit 5122, or may be separately driven by two driving units 5122. The swing directions of the two sets of swing arms 5121 and the adhesive applicator 511 are opposite to each other, that is, the two sets of swing arms 5121 move toward or away from the workpiece at the same time. When adhesive needs to be applied to one surface of the workpiece, the adhesive applicator 511 corresponding to the surface on one side to which adhesive is to be applied may be connected to the adhesive supply mechanism, and the adhesive applicator 511 corresponding to the other side does not have adhesive and plays a supporting role during application, supporting the adhesive applicator 511 on the one side that has adsorbed the adhesive, and applying the adhesive evenly to the workpiece. When adhesive needs to be applied to two surfaces of the workpiece, both of the adhesive applicators 511 corresponding to both surfaces of the workpiece may be connected to the adhesive supply mechanism, and the two adhesive applicators 511 support each other and simultaneously apply adhesive to the two surfaces of the workpiece, making the adhesive application on the two surfaces of the workpiece uniform and consistent. By adjusting whether the two adhesive applicators are connected to the adhesive supply mechanism, it is possible to select whether to apply adhesive to one surface or both surfaces of the workpiece.

[0189] In addition, the coating mechanism 51 can be provided on one or more of the anode plate 1, the first separator 31, the cathode plate 2, and the second separator 32 to meet the coating needs of different coating targets.

[0190] 28, the difference between this embodiment and the embodiment in FIG. 26 is that the member to be coated is the cathode plate 2, and the adhesive applicator 511 is installed in the movement path of the cathode plate 2 to apply adhesive to one or two surfaces of the cathode plate 2. In some embodiments not shown, the adhesive applicator 511 is installed in the movement path of the anode plate 1 to apply adhesive to one or two surfaces of the anode plate 1. Furthermore, the adhesive applicator 511 may be multiple and is installed in multiple movement paths of the anode plate 1, the first separator 31, the cathode plate 2, and the second separator 32, respectively.

[0191] As shown in FIG. 29, a processing apparatus according to another embodiment of the present application differs from the embodiment of FIG.

[0192] FIG. 30 shows one embodiment of the coating mechanism 52, which also includes an adhesive coating section 522, an adhesive supply mechanism (not shown), and a drive mechanism 521. Here, the adhesive coating section 522 and the drive mechanism 521 of the coating mechanism have a different structure from the adhesive coating section 511 and the drive mechanism 512 in FIG. 27, and an adsorption layer is provided on one side of the adhesive coating section 522 facing the member to be coated, the adsorption layer is connected to the adhesive supply mechanism, and the adhesive coating section 522 is moved by the drive mechanism 521 to press against the surface of the member to be coated or to move away from the surface of the member to be coated. However, the adhesive coating section does not perform a rotational movement. When the adhesive coating section 522 presses against the surface of the member to be coated, a relative sliding occurs between the adsorption layer and the surface of the member to coat the adhesive on the surface of the member to be coated.

[0193] In this embodiment, the driving mechanism 521 may be a cylinder, an oil cylinder, a screw-nut mechanism, or the like.

[0194] In this embodiment, the application mechanism further includes a bracket 523, the bracket 523, the adhesive application unit 522, and the driving mechanism 521 are respectively installed on both sides of the workpiece, and the bracket 523 supports the adhesive application unit 521 on one side that adsorbs the adhesive, so as to apply the adhesive evenly to the workpiece. In this way, it is possible to apply the adhesive to one surface of the workpiece.

[0195] As shown in Fig. 31, the application mechanism 52 includes two sets of adhesive application units 522 and a driving mechanism 521, which are respectively installed on both sides of the workpiece, and the two adhesive application units 522 may be close to the workpiece or away from the workpiece at the same time. The two adhesive application units 521 support each other and simultaneously apply adhesive to the two surfaces of the workpiece, so that the adhesive application on the two surfaces of the workpiece is uniform and consistent. By adjusting whether the two adhesive application units are connected to the adhesive supply mechanism, it is possible to select whether to apply adhesive to one surface or both surfaces of the workpiece.

[0196] In addition, the coating mechanism 52 can be provided on one or more of the anode plate 1, the first separator 31, the cathode plate 2, and the second separator 32 to meet the coating needs of different coating targets.

[0197] Figure 32 shows another embodiment of the application mechanism 53 for applying adhesive to a predetermined portion of the surface of the workpiece to form an inhibitor layer, the application mechanism 53 including a nozzle 531 for applying adhesive to the predetermined portion of the surface of the workpiece, an adhesive supply mechanism (not shown) for providing adhesive to the nozzle, and a control valve (not shown) for connecting the adhesive supply mechanism to the nozzle and connected in communication with an application control unit.

[0198] In some embodiments, the nozzle is located on one side of the workpiece, thus achieving application of adhesive to one surface of the workpiece.

[0199] In some other embodiments, as shown in Fig. 33, there are multiple nozzles, each installed on both sides of the workpiece, so that it is possible to apply adhesive to two surfaces of the workpiece.

[0200] 34 is a structural schematic diagram of a battery cell according to another embodiment of the present application. The battery cell includes an outer frame 181 and one or more electrode assemblies 182 housed in the outer frame 181, the outer frame 181 includes a housing 1811 and a cover plate 1812, the housing 1811 has an accommodation cavity, and the housing 1811 has an opening, that is, the plane does not have a housing wall and communicates the inside and outside of the housing 1811 so that the electrode assembly 182 can be housed in the accommodation cavity of the housing 1811, the cover plate 1812 and the housing 1811 are joined at the opening of the housing 1811 to form a hollow cavity, and after the electrode assembly 182 is housed in the outer frame 181, the outer frame 181 is filled with an electrolyte and sealed.

[0201] The housing 1811 is determined by the shape after one or more electrode assemblies 182 are combined, and may be, for example, a hollow rectangular parallelepiped, a hollow cube, or a hollow cylinder. For example, when the housing 1811 is a hollow rectangular parallelepiped or a cube, one of the planes of the housing 1811 is an open surface, i.e., the plane does not have a housing wall and communicates between the inside and the outside of the housing 1811, and when the housing 1811 is a hollow cylinder, one of the circular side surfaces of the housing 1811 is an open surface, i.e., the circular side surface does not have a housing wall and communicates between the inside and the outside of the housing 1811.

[0202] In another embodiment of the present application, the housing 1811 may be made of a conductive metallic material or plastic, and optionally, the housing 1811 is made of aluminum or an aluminum alloy.

[0203] The structure of the electrode assembly 182 may refer to the relevant contents of the electrode assembly described in the embodiment of FIGS. 1 to 28, and will not be described further here.

[0204] Shown in Figure 35 is a structural schematic diagram of a battery module of another embodiment of the present application, in which the battery module 19 includes a plurality of battery cells 191 connected to each other, where the plurality of battery cells 191 may be connected in series or in parallel or in series-parallel, where series-parallel means that the connection includes both series connection and parallel connection, and the structure of the battery cell 191 may refer to the battery cell described in the corresponding embodiment of Figure 29, and will not be further described here.

[0205] Fig. 36 is a structural schematic diagram of a battery according to another embodiment of the present application, in which the battery includes a housing and multiple battery cells are housed in the housing. The structure of the battery cell may refer to the structure of the battery cell shown in Fig. 29. The manner of housing the multiple battery cells in the housing may include directly mounting the battery cells in the housing, or forming a battery module with the multiple battery cells and further mounting the battery module in the housing.

[0206] As shown in FIG. 36, in some embodiments, the battery includes a plurality of battery modules 19 and a housing, the housing includes a lower housing 20 and an upper housing 30, the plurality of battery modules 19 may be connected in series or parallel or series-parallel, the lower housing 20 has a receiving cavity, and the lower housing 20 has an opening so that the connected plurality of battery modules 19 can be received in the receiving cavity of the lower housing 20, the upper housing 30 and the lower housing 20 are joined to the opening of the lower housing 20 to form a hollow cavity, and the upper housing 30 and the lower housing 20 are sealed after being joined.

[0207] In another embodiment of the present application, the battery may solely power a power consuming device, and the battery may be referred to as a battery pack, for example, as used to power an automobile.

[0208] In another embodiment of the present application, according to the power consumption demand of the power consumption device, the multiple batteries are connected together and then combined into a battery pack, which is used to power the power consumption device. In another embodiment of the present application, the battery pack may be housed and packaged in a single housing.

[0209] For ease of explanation, the following embodiments are described taking as an example that the power consuming device includes a battery.

[0210] An embodiment of the present application further provides a power consuming device, for example, the power consuming device may be a motor vehicle, for example, a new energy vehicle, and the power consuming device includes a battery as described in the above embodiment, where the battery used in the power consuming device may be the battery as described in the corresponding embodiment of Figure 31, and will not be further described herein.

[0211] For example, FIG. 37 shows a structural schematic diagram of a power consumption device according to another embodiment of the present application, where the power consumption device may be a vehicle, where the vehicle may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, where the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range extender vehicle, etc. The vehicle includes a battery 2101, a controller 2102 and a motor 2103. The battery 2101 is for supplying power to the controller 2102 and the motor 2103 as the operation power source and driving power source of the vehicle, for example, the battery 2101 is for meeting the operating power demand during starting, navigating and running of the vehicle. For example, the battery 2101 supplies power to the controller 2102, and the controller 2102 controls the battery 2101 to supply power to the motor 2103, and the motor 2103 receives the power of the battery 2101 and uses it as the driving power source of the vehicle, providing driving power to the vehicle instead of fuel oil or natural gas, or instead of a part thereof.

[0212] As will be understood by those skilled in the art, some embodiments herein include some features that are included in other embodiments but not other features, but it is meant that a combination of features of different embodiments falls within the scope of the present application and forms a different embodiment. For example, in the claims, any one of the embodiments to be protected can be used in any combination manner.

[0213] The above embodiments are only used to explain the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art can still understand that the technical solutions described in the above embodiments can be modified or some of the technical features can be replaced with equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application. [Explanation of symbols]

[0214] 1 Anode plate 2 Cathode plate 3. Separator 4 Winding mechanism 5. Coating mechanism 6 Pass Roller 7 Blocking layer 10 Winding start end of anode plate 10 11 Anode body 11, 12, 13, 14, 21, 22 Bend area 19 Battery Module 20 Winding start end of cathode plate 20 Lower housing 21 Cathode body 30 Winding start end of second separator 30 Upper case 31 First separator 32 Second separator 51, 52, 53 Coating mechanism 81 Positioning Information Determination Unit 82 Winding control unit 83 Acquired Units 84 Application information determination unit 85 Application control unit 100, 110, 111 processing equipment 112 Anode active material area 113 Anode tab part 181 Outer Frame 182 Electrode Assembly 191 Battery Cell 210 Current collector 211 First insulating layer coating area 212 Cathode active material area 213 Cathode tab part 311, 312, 321, 322 bending part 511 Adhesive application section 512, 521 Drive mechanism 521, 522 Adhesive application section 523 Bracket 531 Nozzle 711 First Blocking Layer 712 Second Blocking Layer 713 Third Blocking Layer 714 Fourth Blockade 721 First Blocking Layer 722 Second Blocking Layer 1811 Housing 1812 Cover Plate 2101 battery 2102 Controller 2103 Motor 5111 Adhesive application roller 5112 Adsorption layer 5121 Swingarm 5122 Drive unit 7311 First Blocking Layer 7312 Second Blocking Layer 7321 Third Blocking Layer 7322 4th Blockade

Claims

1. A method for processing an electrode assembly, the electrode assembly including a cathode plate, an anode plate, and a separator, the separator being for isolating the anode plate from the cathode plate, the electrode assembly being formed by winding the anode plate, the separator, and the cathode plate, the cathode plate including a cathode active material layer, and the anode plate including a cathode active material layer, the processing method comprising: Applying an adhesive to a predetermined portion of a surface of a coating member to form a blocking layer with the adhesive, the coating member including at least one of the cathode plate, the separator, and the anode plate; and winding the negative electrode plate, the positive electrode plate, and the separator to form the electrode assembly. Here, the blocking layer is located between the adjacent negative electrode active material layer and positive electrode active material layer after winding, and the blocking layer is intended to prevent at least a portion of ions released from the negative electrode active material layer located on one side of the blocking layer from being occluded in the positive electrode active material layer located on the other side of the blocking layer, Prior to the step of applying the adhesive to a predetermined portion of the surface of the workpiece, the processing method further comprises: determining position information of the predetermined portion based on a predetermined post-winding position, the predetermined post-winding position being a position of the blocking layer in the electrode assembly after winding, the predetermined post-winding position being located between the adjacent negative electrode active material layer and positive electrode active material layer, and the position information of the predetermined portion including information for indicating a coating start position and a coating end position of the blocking layer; winding the uncoated cathode plate, the anode plate, and the separator; acquiring winding data of the cathode plate, the separator, and the anode plate, and determining coating information based on the winding data and position information of the predetermined portion; The above-mentioned applying the adhesive to a predetermined portion of the surface of the member to be coated includes applying the adhesive to a predetermined portion of the surface of the member to be coated based on the application information, The winding data includes a winding line speed of the coated member, The position information of the preset portion includes a coating start length and a coating end length of the blocking layer, The application information includes an application start time and an application end time, the coating start time is the time from the start of the winding operation to the start of coating of the coated member, and the coating end time is determined based on the coating start length and coating end length of the blocking layer, the winding line speed of the coated member, and the coating length of the coating mechanism; a bending region is formed by winding the cathode plate, the separator, and the anode plate, and at least a portion of the predetermined post-winding position is located on a surface of at least one of the cathode plate, the anode plate, and the separator within the bending region.

2. The winding data includes an overall winding angle θ of the cathode plate, the separator, and the anode plate; The position information of the preset portion includes a coating start angle θ1 and a coating end angle θ2 of the blocking layer, The processing method according to claim 1 , wherein the application information includes a application start signal and a application end signal.

3. The preset post-winding position may be on one or both surfaces of the cathode plate, and / or one or both surfaces of the anode plate; and / or The method according to claim 1 or 2, wherein the separator is one surface or two surfaces.

4. 4. The processing method according to claim 1, wherein at least a part of the predetermined post-winding positions is provided at a first bend site and / or a second bend site of the cathode plate in a bend region, and / or at least a part of the predetermined post-winding positions is provided at a first bend site and / or a second bend site of the anode plate, and / or at least a part of the predetermined post-winding positions is provided at a bend site of the separator adjacent to the first bend site of the cathode plate and / or a bend site of the separator adjacent to the second bend site, and / or at least a part of the predetermined post-winding positions is provided at a bend site of the separator adjacent to the first bend site of the anode plate and / or a bend site of the separator adjacent to the second bend site.

5. The processing method according to any one of claims 1 to 4, wherein a method for applying adhesive to a predetermined portion of the surface of the member to be coated includes a press coating method, a roller coating method, or a spray coating method.

6. The processing method according to any one of claims 1 to 4, wherein the adhesive comprises at least one of polyacrylic acid / acrylic acid ester, butylbenzene, phenylpropyl, ethylene-vinyl acetate copolymer, polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy adhesive, silicone adhesive, polyurethane adhesive, styrene-isoprene-styrene copolymer adhesive, and modified versions of the above materials.

7. An apparatus for processing an electrode assembly, the electrode assembly including a cathode plate, an anode plate, and a separator, the separator being for isolating the cathode plate and the anode plate, the electrode assembly being formed by winding the cathode plate, the separator, and the anode plate, the cathode plate including a cathode active material layer, and the anode plate including a cathode active material layer, wherein the processing apparatus comprises: A coating mechanism for coating an adhesive on a predetermined portion of a surface of a coating member and forming a blocking layer with the adhesive, the coating member including at least one of the cathode plate, the separator, and the anode plate; a winding mechanism for winding the cathode plate, the anode plate, and the separator to form the electrode assembly, the coating mechanism including: a winding mechanism located upstream of the winding mechanism; Including, Here, the blocking layer is located between the adjacent negative electrode active material layer and positive electrode active material layer after winding, and the blocking layer is intended to prevent at least a portion of ions released from the negative electrode active material layer located on one side of the blocking layer from being occluded in the positive electrode active material layer located on the other side of the blocking layer after winding, a position information determination unit that determines position information of the predetermined portion based on a predetermined position after winding and transmits the position information to an application information determination unit, the predetermined position after winding being a position in the electrode assembly after the blocking layer is wound, the predetermined position after winding being located between the adjacent cathode active material layer and anode active material layer, and the position information of the predetermined portion including information for indicating a coating start position and a coating end position of the blocking layer; a winding control unit for controlling the winding mechanism to wind the uncoated cathode plate, the anode plate, and the separator; an acquisition unit for acquiring winding data of the cathode plate, the separator, and the anode plate, and transmitting the winding data to a coating information determination unit; an application information determination unit for determining application information based on the winding data and the position information of the preset portion; and an application control unit for controlling the application mechanism to apply adhesive to a surface of the application target member based on the application information, The winding data includes a winding line speed V of the coated member, The position information of the preset portion includes a coating start length L1 and a coating end length L2 of the blocking layer, The application information includes an application start time T1 and an application end time T2, The coating start time T1 is a time from the start of the winding operation to the start of coating of the coated member, and the coating end time T2 is determined based on the coating start length and coating end length of the blocking layer, the winding line speed of the coated member, and the coating length of the coating mechanism, a bending region is formed by winding the cathode plate, the separator, and the anode plate, and at least a portion of the predetermined post-winding position is located on a surface of at least one of the cathode plate, the anode plate, and the separator within the bending region.

8. The winding data includes an overall winding angle θ of the cathode plate, the separator, and the anode plate; The position information of the preset portion includes a coating start angle θ1 and a coating end angle θ2 of the blocking layer, The processing device according to claim 7 , wherein the application information includes a application start signal and a application end signal.

9. The preset post-winding position may be on one or both surfaces of the cathode plate, and / or one or both surfaces of the anode plate; and / or 9. The processing device according to claim 7 or 8, on one surface or on two surfaces of the separator.

10. 10. The processing device according to claim 7, wherein at least a part of the predetermined post-winding position is provided at a first bend site and / or a second bend site of the cathode plate in a bend region, and / or at least a part of the predetermined post-winding position is provided at a first bend site and / or a second bend site of the anode plate, and / or at least a part of the predetermined post-winding position is provided at a bend site of the separator adjacent to the first bend site of the cathode plate and / or a bend site of the separator adjacent to the second bend site, and / or at least a part of the predetermined post-winding position is provided at a bend site of the separator adjacent to the first bend site of the anode plate and / or a bend site of the separator adjacent to the second bend site.

11. the application mechanism is for applying an adhesive to the predetermined portion of the surface of the member to be coated to form the blocking layer; The coating mechanism includes: an adhesive application unit for applying adhesive to the predetermined portion of the surface of the member to be coated; an adhesive supply mechanism for supplying adhesive to the adhesive application section; and a drive mechanism for driving the adhesive applicator to press the adhesive applicator against the surface of the workpiece or to move away from the surface of the workpiece, wherein: The processing apparatus according to any one of claims 7 to 10, wherein the drive mechanism is communicatively connected to the application control unit.

12. The adhesive applicator is provided on one side of the member to be coated, or The processing apparatus according to claim 11 , wherein the adhesive applying section is provided in plurality, and is disposed on both sides of the workpiece, respectively.

13. An adsorption layer is provided on the side of the adhesive application section facing the workpiece, and the adsorption layer is in communication with the adhesive supply mechanism, or The processing apparatus according to claim 11, wherein the adhesive application section includes an adhesive application roller, an adsorption layer is applied in a circumferential direction of the adhesive application roller, the adsorption layer is in communication with the adhesive supply mechanism, and the adhesive application roller is rotatably installed and connected to the drive mechanism.

14. The application mechanism is for applying an adhesive to a predetermined portion of the surface of the member to be coated to form the blocking layer, The coating mechanism includes: a nozzle for applying adhesive to a predetermined portion of the surface of the member to be coated; an adhesive supply mechanism for providing adhesive to the nozzle; The processing apparatus according to any one of claims 7 to 10, further comprising a control valve for connecting the adhesive supply mechanism and the nozzle, the control valve being connected in communication with the application control unit.

15. The nozzle is installed on one side of the workpiece, or The processing apparatus according to claim 14 , wherein the nozzle is a plurality of nozzles, each of which is installed on either side of the workpiece.

16. 16. The processing apparatus of any one of claims 7 to 15, wherein the adhesive comprises at least one of polyacrylic acid / acrylic acid ester, butylbenzene, phenylpropyl, ethylene-vinyl acetate copolymer, polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy adhesives, silicone adhesives, polyurethane adhesives, styrene-isoprene-styrene copolymer adhesives, and modifications of the above materials.

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