Pole piece surface treatment device and treatment method and battery production equipment

Abstract

The invention provides a pole piece surface treatment device and method and battery production equipment, and belongs to the technical field of batteries. The pole piece surface treatment device comprises a conveying assembly and an electric heating assembly, the conveying assembly is used for conveying a pole piece, and the pole piece comprises a first area coated with a conductive coating; the electric heating assembly comprises a first conductive part used for being connected with the positive electrode of a power source and a second conductive part used for being connected with the negative electrode of the power source. Wherein the first conductive part and the second conductive part are arranged at an interval and are respectively in contact with the first area of the pole piece, so that the part, positioned between the first conductive part and the second conductive part, of the first area of the pole piece forms an electric heating loop with the first conductive part, the second conductive part and the power supply. The burrs on the surface of the pole piece can be quickly removed in an electric heating treatment mode, the surface treatment efficiency is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole piece surface treatment device and treatment method, and battery production equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The pole piece is an important part of the battery cell. During the production process of the pole piece, due to the limitations of manufacturing materials, manufacturing equipment and manufacturing processes, burrs will form on the surface of the pole piece. The burrs may pierce the diaphragm, causing the battery cell to short-circuit, increasing the risk of thermal runaway of the battery cell. In some embodiments, the burrs are cleaned by burning, which has low controllability and easily leads to poor consistency of the pole piece surface, which is not conducive to maintaining the stability of the pole piece structure and reduces the quality of the pole piece. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one purpose of the present application is to provide a pole piece surface treatment device and treatment method, and battery production equipment, which can quickly remove burrs and improve the stability of the pole piece structure.

[0005] An embodiment of the first aspect of the present application provides a pole piece surface treatment device, which includes a conveying component and an electric heating component, the conveying component is used to convey the pole piece, the pole piece includes a first area coated with a conductive coating; the electric heating component includes a first conductive member for connecting to the positive pole of a power supply and a second conductive member for connecting to the negative pole of the power supply; wherein the first conductive member and the second conductive member are arranged at intervals and respectively contact the first area of ​​the pole piece, so that the part of the first area of ​​the pole piece located between the first conductive member and the second conductive member forms an electric heating circuit with the first conductive member, the second conductive member, and the power supply.

[0006] In the technical solution of the embodiment of the present application, the portion between the first conductive member and the second conductive member is electrically heated so that the electrically conductive portion can generate high temperature, and the burrs on the surface of the pole piece can be melted at high temperature, thereby achieving the removal of the burrs on the surface of the pole piece. The use of the energizing treatment method can, on the one hand, quickly increase the temperature of the pole piece, which helps to improve the efficiency of burr removal and reduce energy consumption; on the other hand, it can improve the consistency of the surface temperature of the pole piece, which is conducive to maintaining the stability of the pole piece structure, and release elastic deformation in advance, thereby improving the quality of the pole piece.

[0007] In some embodiments, the first conductive member and the second conductive member are arranged at intervals along the travel direction of the pole piece. By arranging the first conductive member and the second conductive member at intervals along the travel direction of the pole piece, the uniformity of the surface treatment of the pole piece can be improved, thereby improving the quality of the pole piece.

[0008] In some embodiments, the second conductive member includes a first sub-conductive member and a second sub-conductive member arranged at intervals along the travel direction of the pole piece, and the first sub-conductive member and the second sub-conductive member are both connected to the negative electrode of the power supply; wherein the first conductive member is located between the first sub-conductive member and the second sub-conductive member along the travel direction of the pole piece. By connecting the first conductive member to the positive electrode of the power supply and arranging it between the first sub-conductive member and the second sub-conductive member, the current can flow into the first sub-conductive member and the second sub-conductive member respectively through the first region in the travel direction of the pole piece and in the reverse direction of the travel direction of the pole piece, which can avoid the leakage phenomenon on one side of the conductive member caused by only two conductive members connected to the power supply, improve the current utilization rate of the pole piece and reduce energy consumption.

[0009] In some embodiments, at least one of the first conductive member and the second conductive member includes a first conductive roller; the central axis of the first conductive roller is parallel to the first direction, and the length of the first conductive roller along the first direction is the same as the width of the first region along the first direction; wherein the first direction is perpendicular to the travel direction of the pole piece and parallel to the surface of the first region. By using the first conductive roller and making the length of the first conductive roller the same as the width of the first region, the current can be provided to the first region more concentratedly, thereby improving the current utilization rate; on the other hand, the first conductive roller can roll the surface of the pole piece by rotating, so that the burrs on the surface of the pole piece are smoothed under the action of pressure, which can play a role in assisting the removal of burrs.

[0010] In some embodiments, the pole piece includes a plurality of first regions spaced apart along a first direction; at least one of the first conductive member and the second conductive member includes a plurality of first conductive rollers; wherein the plurality of first conductive rollers are arranged corresponding to the plurality of first regions along the first direction, and any first conductive roller contacts the corresponding first region. By arranging the plurality of first regions spaced apart along the first direction of the pole piece, the production efficiency of the pole piece can be improved, and at the same time, each first region contacts the first conductive member and the second conductive member respectively, and each first region can be heated independently by a partition, which is beneficial to the precise control of the surface treatment and improves the quality of the surface treatment.

[0011] In some embodiments, the pole piece includes a plurality of first regions spaced apart along a first direction, at least one of the first conductive member and the second conductive member includes a second conductive roller, the central axis of the second conductive roller is parallel to the first direction; the second conductive roller includes a plurality of conductive portions spaced apart along the first direction and corresponding to the plurality of first regions, any conductive portion is in contact with the corresponding first region; wherein the first direction is perpendicular to the travel direction of the pole piece and parallel to the surface of the first region. By arranging the plurality of first regions spaced apart in the first direction of the pole piece, the production efficiency of the pole piece can be improved, and at the same time, the second conductive roller is used and the plurality of conductive portions are spaced apart on the second conductive roller, so that a single second conductive roller can perform electrical heating treatment on the plurality of first regions at the same time, simplifying the structure and improving the convenience of operation.

[0012] In some embodiments, the pole piece further includes a second region between two adjacent first regions that is not coated with a conductive coating, and the second conductive roller further includes an insulating film sleeved between two adjacent conductive portions; wherein the insulating film is arranged corresponding to the second region, and the length of the insulating film along the first direction is the same as the width of the second region along the first direction. By arranging an insulating film between two adjacent conductive portions, and making the insulating film arranged corresponding to the second region, the insulating film is used to isolate the non-conductive portion and the second region, thereby reducing the probability of the portion between the two adjacent conductive portions contacting and conducting with the second region, so that the current is concentrated in the first region, and the efficiency of electrical heating in the first region is improved.

[0013] In some embodiments, the electrode surface treatment device further includes a box and a gas supply unit, wherein the box has a receiving cavity and an inlet and an outlet for allowing the electrode to enter and exit the receiving cavity; the gas supply unit is used to supply protective gas into the receiving cavity. By providing the box, the interaction between the external gas and the gas in the receiving cavity can be slowed down, so that during the treatment of the electrode in the receiving cavity of the box, the oxidation of the electrode can be delayed, while reducing heat loss and improving energy utilization.

[0014] In some embodiments, the electrode surface treatment device further includes a gas concentration sensor and a controller. The gas concentration sensor is disposed in the receiving chamber, and the gas concentration sensor is used to detect the gas concentration of the protective gas in the receiving chamber; the controller is respectively connected to the gas concentration sensor and the gas supply unit signal, and the controller is configured to control the gas supply unit to adjust the gas concentration in the receiving chamber according to the detection result of the gas concentration sensor. By using the gas concentration sensor to collect the gas concentration in the receiving chamber in real time, the gas concentration in the receiving chamber can be adjusted in real time according to the demand, so as to reduce the probability of oxidation of the electrode during the electric heating treatment.

[0015] In some embodiments, the electrode surface treatment device further includes a deviation correction component, which is arranged upstream of the electric heating component along the direction of travel of the electrode, and is used to correct the deviation of the electrode before it contacts the electric heating component. By providing the deviation correction component, the position of the electrode can be adjusted in real time, so that the electrode can better contact the first conductive member and the second conductive member, thereby improving the quality of the electrode surface treatment.

[0016] In some embodiments, the electric heating assembly further includes a current regulating module connected to the power supply, and the current regulating module is used to regulate the current of the electric heating circuit. By setting the current regulating module, the current of the electric heating circuit is regulated in real time according to the demand, so that the electrode can be in a more suitable temperature state, which can achieve the removal of burrs on the one hand, and reduce the influence of the high temperature generated by heating on the surface of the electrode on the other hand.

[0017] In some embodiments, the electrode surface treatment device further includes a temperature sensor and a controller. The temperature sensor is arranged downstream of the electric heating component along the direction of travel of the electrode. The temperature sensor is used to detect the surface temperature of the first area after being treated by the electric heating component. The controller is respectively connected to the temperature sensor and the current regulation module signal. The controller is configured to control the current regulation module to adjust the current of the electric heating circuit according to the detection result of the temperature sensor. By using the temperature sensor to collect the surface temperature of the first area after being treated by the electric heating component in real time, it is convenient to grasp the state of the electrode after the electric heating treatment, so as to make corresponding adjustments to the electrode surface treatment process, so that the electrode is in a suitable temperature range and the quality of the electrode is improved.

[0018] In some embodiments, the electrode surface treatment device further includes a thickness gauge and a controller. The thickness gauge is arranged downstream of the electric heating component along the direction of travel of the electrode. The thickness gauge is used to detect the thickness of the first area after being treated by the electric heating component. The controller is respectively connected to the thickness gauge and the current regulating module signal. The controller is configured to control the current regulating module to adjust the current of the electric heating circuit according to the detection result of the thickness gauge. By using the thickness gauge to detect the thickness of the electrode after being treated by the electric heating component in real time, it is convenient to grasp the state of the electrode after the electric heating treatment, and to make corresponding adjustments to the electrode surface treatment process so that the electrode is in a suitable temperature range, which is conducive to releasing the elastic deformation of the electrode.

[0019] An embodiment of the second aspect of the present application provides a battery production equipment, which includes the electrode surface treatment device in the above embodiment.

[0020] The third aspect of the present application provides a method for processing the surface of a pole piece, the method comprising: conveying the pole piece along a preset direction of travel, the pole piece comprising a first area coated with a conductive coating; contacting the first area of ​​the pole piece with a first conductive member and a second conductive member of an electric heating component respectively, the first conductive member being used to connect to the positive pole of a power source, the second conductive member being used to connect to the negative pole of a power source, the first area of ​​the pole piece being located between the first conductive member and the second conductive member forming an electric heating loop with the first conductive member, the second conductive member, and the power source; controlling the electric heating component to perform electric heating treatment on the part of the first area of ​​the pole piece that is in the electric heating loop. By performing electric heating treatment on the first area between the first conductive member and the second conductive member, the burrs on the surface of the pole piece can be melted at high temperature, thereby achieving the removal of the burrs on the surface of the pole piece; adopting an electric treatment method, the operation is convenient, on the one hand, the temperature of the pole piece can be quickly increased, which helps to improve the efficiency of burr removal and reduce energy consumption; on the other hand, the consistency of the surface temperature of the pole piece can be improved, which is conducive to maintaining the stability of the pole piece structure, and the elastic deformation is released in advance, thereby improving the quality of the pole piece.

[0021] In some embodiments, controlling the electric heating component to electrically heat the portion of the first region of the electrode in the electric heating circuit further includes: obtaining the surface temperature of the first region of the electrode after being treated by the electric heating component; and adjusting the current of the electric heating circuit based on the surface temperature. By using a temperature sensor to collect the surface temperature of the first region after being treated by the electric heating component in real time, it is convenient to grasp the state of the electrode after the electric heating treatment, so as to make corresponding adjustments to the electrode surface treatment process, so that the electrode is in a suitable temperature range, and the quality of the electrode is improved.

[0022] In some embodiments, adjusting the current of the electric heating circuit based on the surface temperature includes: increasing the current of the electric heating circuit in response to the surface temperature being less than a first preset temperature threshold; and / or reducing the current of the electric heating circuit in response to the surface temperature being greater than a second preset temperature threshold; wherein the first preset temperature threshold is less than the second preset temperature threshold. By obtaining the surface temperature of the first area after the electric heating component is processed, the current of the electric heating circuit is adjusted accordingly according to the temperature feedback, so that the electrode is in a suitable temperature range, thereby improving the quality of the electrode.

[0023] In some embodiments, the first preset temperature threshold is in the range of 200° C.-220° C., and / or the second preset temperature threshold is in the range of 330° C.-350° C. By reasonably selecting the first preset temperature threshold and the second preset temperature threshold, on the one hand, burrs can be effectively removed, and on the other hand, the stability of the pole piece structure can be maintained, deformation of the pole piece structure can be avoided as much as possible, and the quality of the pole piece can be improved.

[0024] In some embodiments, controlling the electric heating component to electrically heat the portion of the first region of the electrode in the electric heating circuit further includes: obtaining a first thickness of the first region of the electrode after being treated by the electric heating component; and adjusting the current of the electric heating circuit based on the first thickness. By using a thickness measuring instrument to detect the thickness of the electrode after being treated by the electric heating component in real time, it is convenient to grasp the state of the electrode after being treated by the electric heating, so as to adjust the surface treatment process of the electrode accordingly, so that the electrode is in a suitable temperature range, which is conducive to releasing the elastic deformation of the electrode.

[0025] In some embodiments, adjusting the current of the electric heating circuit based on the first thickness includes: obtaining the second thickness of the first region of the pole piece before being processed by the electric heating component; determining the expansion rate of the first region based on the first thickness and the second thickness, the expansion rate being the ratio of the difference between the first thickness and the second thickness to the second thickness; and increasing the current of the electric heating circuit in response to the expansion rate being less than a preset expansion threshold. By controlling the expansion rate of the first region within the preset expansion threshold range, the elastic deformation of the pole piece is fully released, which is conducive to improving the quality of the pole piece.

[0026] In some embodiments, the electric heating assembly is disposed in the receiving chamber of the box; before the electrode piece is conveyed along a preset direction of travel, and the electrode piece includes a first region coated with a conductive coating, the processing method further comprises: supplying a protective gas into the receiving chamber until the gas concentration of the protective gas in the receiving chamber reaches a preset concentration threshold. By supplying the protective gas to the receiving chamber in advance, the electrode piece can be electrically heated in an environment of the protective gas, which can reduce the probability of oxidation of the electrode piece during the electrical heating process.

[0027] In some embodiments, the processing method further includes: obtaining the gas concentration of the protective gas in the receiving chamber during the electric heating treatment; in response to the gas concentration being lower than a preset concentration threshold, replenishing the protective gas into the receiving chamber. By detecting the gas concentration of the protective gas in the receiving chamber in real time during the electric heating treatment, and supplying the protective gas according to demand, the electrode can be continuously subjected to the electric heating treatment in the protective gas environment, which can reduce the probability of oxidation of the electrode during the electric heating treatment and improve the quality of the electrode.

[0028] In some embodiments, controlling the electric heating component to perform electric heating treatment on the portion of the first area of ​​the pole piece in the electric heating loop also includes: controlling the electric heating component to heat the portion of the first area of ​​the pole piece in the electric heating loop, so that the surface temperature of the portion of the first area of ​​the pole piece in the electric heating loop rises to a preset temperature range within a preset time period after the start of the electric heating treatment; wherein the preset time period is less than or equal to 1s, and the preset temperature range is 200°C-350°C. By raising the temperature of the first area between the first conductive member and the second conductive member to between 200°C-350°C within 1s, on the one hand, the efficiency of removing burrs is improved, and on the other hand, the influence time of high temperature on the pole piece surface is reduced as much as possible to protect the pole piece structure.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0031] Figure 1 A schematic diagram of the structure of a pole piece surface treatment device provided in an embodiment of the present application; Figure 2 A schematic diagram of the contact between the pole piece and two first conductive voltage rollers provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of another electrode surface treatment device provided in an embodiment of the present application; Figure 4 A schematic diagram showing that the first area on the pole piece provided in an embodiment of the present application is in contact with three first conductive voltage rollers respectively; Figure 5 A schematic diagram of the contact between the pole piece and three second conductive voltage rollers provided in an embodiment of the present application; Figure 6 A schematic flow chart of a method for processing a pole piece surface provided in an embodiment of the present application; Figure 7 A schematic flow chart of another method for processing the surface of a pole piece provided in an embodiment of the present application.

[0032] Description of reference numerals: 100. Electrode surface treatment device; 110. Conveying assembly; 111. Insulating transmission roller; 120. Electric heating assembly; 121. First conductive member; 122. Second conductive member; 1221. First sub-conductive member; 1222. Second sub-conductive member; 123. First conductive voltage roller; 124. Second conductive voltage roller; 1241. Conductive portion; 1242. Insulating film; 130. Housing; 131. Inlet; 132. Outlet; 133. Accommodating chamber; 140. Gas concentration sensor; 150. Correction assembly; 160. Temperature sensor; 170. Thickness gauge; 200. Electrode; 210. First region; 220. Second region; 300. Treatment method. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0039] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0042] The pole piece is an important component of the battery cell. During the manufacturing process of the battery cell, the pole piece needs to be cut, die-cut, wound or laminated so that the pole piece can be finally assembled into a complete battery cell. However, during the production process of the pole piece, due to the limitations of manufacturing materials, manufacturing equipment and manufacturing processes, burrs may form on the surface of the pole piece. When the battery cell is coated, the diaphragm is easily pierced by the burrs on the surface of the pole piece, resulting in a short circuit in the battery cell, increasing the risk of thermal runaway of the battery cell.

[0043] In some embodiments, the burrs on the surface of the pole piece are smoothed under pressure by rolling the surface of the pole piece with a hot roller. In some embodiments, the surface of the pole piece is purged with hot air to melt the burrs on the surface of the pole piece. The maximum temperature that can be reached by the treatment method of hot roller and hot air is limited, and it takes a long time to reach the maximum temperature, which makes the efficiency of the pole piece surface treatment low.

[0044] In some embodiments, a combustible gas is introduced into the space containing the pole piece and ignited to form a flame in the space. The flame has an instantaneous high temperature, and the high temperature generated by the flame is used to act on the surface of the pole piece to remove burrs on the surface of the pole piece. The combustion method has low controllability, and the surface of the pole piece may be heated unevenly, resulting in poor consistency of the pole piece surface, which is not conducive to maintaining the stability of the pole piece structure and has high energy consumption.

[0045] In order to solve the above problems, the present application provides a pole piece surface treatment device and treatment method, and battery production equipment, wherein the pole piece surface treatment device includes a conveying component and an electric heating component, wherein the conveying component is used to convey the pole piece, and the pole piece includes a first area coated with a conductive coating; the electric heating component includes a first conductive member for connecting to the positive pole of a power source and a second conductive member for connecting to the negative pole of the power source; wherein the first conductive member and the second conductive member are arranged at intervals and respectively contact the first area of ​​the pole piece, so that the portion of the first area of ​​the pole piece located between the first conductive member and the second conductive member forms an electric heating loop with the first conductive member, the second conductive member, and the power source. By using the electric heating component to electrically heat part of the first area, on the one hand, the temperature of the pole piece can be quickly increased, which helps to improve the efficiency of burr removal; on the other hand, the consistency of the surface temperature of the pole piece can be improved, which is conducive to maintaining the stability of the pole piece structure, and the elastic deformation can be released in advance, thereby improving the quality of the pole piece.

[0046] The electrode surface treatment device and treatment method provided in the embodiments of the present application can be used for, but not limited to, the treatment of electrode surface burrs in square shell battery cells, the treatment of electrode surface burrs in soft-pack battery cells, and the treatment of electrode surface burrs in cylindrical battery cells.

[0047] The battery production equipment provided in the embodiment of the present application uses a battery cell processed by a pole piece surface treatment device. The battery cell can be used in electrical equipment, which can be but not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc. It can also be used, but not limited to, in energy storage systems or energy systems combined with energy storage or energy conversion devices such as batteries (such as lithium batteries) and fuel cells (such as hydrogen batteries).

[0048] like Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram of the structure of a pole piece surface treatment device provided in an embodiment of the present application; Figure 2 A schematic diagram of the contact between a pole piece and two first conductive voltage rollers provided in an embodiment of the present application.

[0049] The embodiment of the present application provides a pole piece surface treatment device 100, which includes a conveying component 110 and an electric heating component 120, the conveying component 110 is used to convey the pole piece 200, the pole piece 200 includes a first area 210 coated with a conductive coating; the electric heating component 120 includes a first conductive member 121 for connecting to the positive pole of a power supply and a second conductive member 122 for connecting to the negative pole of the power supply; wherein the first conductive member 121 and the second conductive member 122 are arranged at intervals and respectively contact the first area 210 of the pole piece 200, so that the first area 210 of the pole piece 200 located between the first conductive member 121 and the second conductive member 122 forms an electric heating circuit with the first conductive member 121, the second conductive member 122, and the power supply.

[0050] The pole piece 200 is the part of the battery cell used to store and release electrical energy, and its structure includes a current collector and a conductive coating. The current collector is the supporting skeleton of the pole piece 200, which plays the role of carrying and transmitting current. For the positive electrode current collector, its material is, for example, aluminum foil; for the negative electrode current collector, its material is, for example, copper foil. The conductive coating is one or more layers of functional substances coated on the surface of the current collector, mainly composed of active substances, binders, conductive agents, etc. For the conductive coating on the positive electrode current collector, the active substances are, for example, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, etc.; for the conductive coating on the negative electrode current collector, the active substances are, for example, graphite, silicon-based materials, etc.

[0051] The area on the current collector of the pole piece 200 coated with the conductive coating is the first area 210, and the area not coated with the conductive coating is the second area 220. It should be noted that the first area 210 includes the conductive coating and the corresponding current collector carrying the conductive coating, and the second area 220 is only the current collector without the conductive coating. In some embodiments, the second area 220 is located at the periphery of the first area 210.

[0052] The conveying assembly 110 is a device for conveying the pole piece 200 to the electric heating assembly 120 for burr removal, and conveying the pole piece 200 after burr removal to the next process. The conveying assembly 110 can be any feasible power component, and its conveying can include continuous conveying and intermittent conveying. Continuous conveying means burr removal during the conveying process; intermittent conveying means burr removal in a static state, and conveying to the next process after the burr removal of the area is completed.

[0053] In some embodiments, the transmission assembly 110 may be a continuous transmission roller, which contacts the pole piece 200 and drives the pole piece 200 to move by the rotation of the transmission roller. In some embodiments, the transmission assembly 110 may be a continuous transmission chain, which is connected to the edge of the pole piece 200 and drives the pole piece 200 to move by the rotation of the transmission chain; the transmission speed of the transmission assembly 110 is, for example, 5 m / min (5 meters per minute), 10 m / min, etc. The embodiments of the present application do not limit this specific structure and transmission speed.

[0054] The electric heating component 120 is a device for energizing the first area 210 of the pole piece 200 so that the first area 210 can generate heat. It specifically includes a first conductive member 121 and a second conductive member 122 that are spaced apart. The first conductive member 121 and the second conductive member 122 can be any feasible conductive components, such as a metal conductive block, a metal conductive brush, a metal conductive roller, and the like. The first conductive member 121 and the second conductive member 122 can be conductive components of the same structural type, or they can be conductive components of different structural types. The spacing arrangement includes the spacing arrangement along the transmission direction and the spacing arrangement in the non-transmission direction. The embodiment of the present application does not limit the arrangement of this specific structure, and it is sufficient to meet the requirement that the first conductive member 121 and the second conductive member 122 are in contact with the first area 210 of the pole piece 200 respectively.

[0055] The first conductive member 121 is connected to the positive pole of the power supply, and the second conductive member 122 is connected to the negative pole of the power supply, so that the portion between the first conductive member 121 and the second conductive member 122 forms an electric heating circuit with the first conductive member 121, the second conductive member 122, and the power supply.

[0056] When the current passes through the current collector and the conductive coating of the electrode 200, both the current collector and the conductive coating will generate heat under the action of resistance. For example, the resistance R of the conductive coating is 1 , the current I passing through the conductive coating 1 , the electric effect heat power generated by the conductive coating is P 1 =I 1 2 R 1 , it can be seen that the larger the current, the greater the electric effect heat power P 1 The larger the value, according to the thermodynamic formula, P 1 t=c 1 m 1 ΔT 1 , t represents time, c 1 represents specific heat capacity, m 1 Indicates mass, ΔT 1 Indicates the temperature change, so the thermal power P 1 The larger the temperature change per unit time, ΔT 1 The larger the value, the higher the temperature generated. The burrs on the surface of the pole piece will melt under high temperature. The temperature rises to between 200℃ and 350℃. At the same time, under the action of current, the molecules of the conductive coating will be affected by Coulomb force and Lorentz force. The molecular layers of the material repel each other, and the conductive coating will expand. According to the expansion theory, Δδ=α×δ×ΔT 1 , α represents the expansion coefficient, δ represents the original size, ΔT 1 Indicates the temperature change, we know the temperature change ΔT 1 The larger the value, the more obvious the change in thickness Δδ of the conductive coating. Similarly, the current collector will also expand under the action of current. Due to the material, the degree of change in its expansion is smaller than that of the conductive coating. The expansion of the pole piece 200 can release elastic deformation and relieve internal stress, making the pole piece 200 more stable during the subsequent assembly process to form a battery cell.

[0057] In some embodiments, the electrode surface treatment device 100 may have its own power supply device, and does not need to rely on external power supply, and uses the self-contained power supply device to perform electric heating treatment. In some embodiments, the electrode surface treatment device 100 does not have a power supply device, and uses an external power supply to provide power to the electric heating component 120 for electric heating treatment.

[0058] In some embodiments, the electric heating assembly 120 may be configured to raise the surface temperature of the first region 210 of the pole piece 200 in the electric heating loop to between 200°C and 350°C, i.e. greater than or equal to 200°C and less than or equal to 350°C within 1 second.

[0059] By heating the portion between the first conductive member 121 and the second conductive member 122 with electricity, the portion with electricity can generate high temperature, and the burrs on the surface of the pole piece can be melted at high temperature, thereby removing the burrs on the surface of the pole piece. The use of the electricity treatment method can, on the one hand, quickly increase the temperature of the pole piece 200, which helps to improve the efficiency of burr removal; on the other hand, it can improve the consistency of the surface temperature of the pole piece, which is conducive to maintaining the stability of the structure of the pole piece 200, and release the elastic deformation in advance, thereby improving the quality of the pole piece 200.

[0060] According to some embodiments of the present application, Figure 2 As shown, the first conductive member 121 and the second conductive member 122 are arranged at intervals along the travel direction of the pole piece 200 .

[0061] The first conductive member 121 and the second conductive member 122 are conductive components for contacting the first region 210 . The first conductive member 121 is connected to the positive electrode of the power source, and the second conductive member 122 is connected to the negative electrode of the power source. Current flows from the first conductive member 121 through the first region 210 and flows into the second conductive member 122 .

[0062] The first conductive member 121 and the second conductive member 122 are arranged at intervals along the travel direction of the pole piece 200. Figure 2 In the direction indicated by the middle arrow, the interval between the first conductive member 121 and the second conductive member 122 is, for example, 0.5 meter, 1 meter, etc.

[0063] In some embodiments, the length of contact between the first conductive member 121 and the second conductive member 122 and the pole piece 200 along the first direction is greater than the width of the first region 210 in the first direction; in some embodiments, the length of contact between the first conductive member 121 and the second conductive member 122 and the pole piece 200 along the first direction is less than the width of the first region 210 in the first direction, and the first direction is perpendicular to the moving direction of the pole piece 200 and parallel to the surface of the first region 210.

[0064] In some embodiments, the first conductive member 121 is disposed upstream of the second conductive member 122, and the pole piece 200 first passes through the first conductive member 121 and then passes through the second conductive member 122; in some embodiments, the second conductive member 122 is disposed upstream of the first conductive member 121, and the pole piece 200 first passes through the second conductive member 122 and then passes through the first conductive member 121. The embodiments of the present application do not limit this arrangement and spacing distance.

[0065] By arranging the first conductive member 121 and the second conductive member 122 at intervals along the travel direction of the pole piece 200 , the uniformity of the surface treatment of the pole piece can be improved, thereby improving the quality of the pole piece 200 .

[0066] like Figure 3 and Figure 4As shown, Figure 3 A schematic diagram of the structure of another electrode surface treatment device provided in an embodiment of the present application; Figure 4 A schematic diagram showing that the first region on the pole piece provided in an embodiment of the present application is in contact with three first conductive voltage rollers respectively.

[0067] According to some embodiments of the present application, the second conductive member 122 includes a first sub-conductive member 1221 and a second sub-conductive member 1222 which are spaced apart along the moving direction of the pole piece 200, and the first sub-conductive member 1221 and the second sub-conductive member 1222 are both connected to the negative pole of the power supply; wherein the first conductive member 121 is located between the first sub-conductive member 1221 and the second sub-conductive member 1222 along the moving direction of the pole piece 200.

[0068] The first sub-conductive member 1221 and the second sub-conductive member 1222 are conductive components for contacting the first region 210, for example, metal conductive blocks, metal conductive brushes, metal conductive rollers, etc., and the two can be conductive components of the same structural type or conductive components of different structural types.

[0069] The first conductive member 121 is connected to the positive electrode of the power supply, the first sub-conductive member 1221 and the second sub-conductive member 1222 are both connected to the negative electrode of the power supply, and the first conductive member 121 is located between the first sub-conductive member 1221 and the second sub-conductive member 1222 along the travel direction of the pole piece 200. The current flows out from the first conductive member 121 along the travel direction of the pole piece 200 and the reverse direction of the travel direction, and flows into the first sub-conductive member 1221 and the second sub-conductive member 1222 respectively through the first region 210 to form two sets of electric heating loops.

[0070] In some embodiments, the first conductive member 121 is located between the first sub-conductive member 1221 and the second sub-conductive member 1222, and the distances from the first conductive member 121 to the first sub-conductive member 1221 and the second sub-conductive member 1222 are the same; in some embodiments, the distance from the first conductive member 121 to the first sub-conductive member 1221 is smaller than the distance from the first conductive member 121 to the second sub-conductive member 1222; in some embodiments, the distance from the first conductive member 121 to the first sub-conductive member 1221 is larger than the distance from the first conductive member 121 to the second sub-conductive member 1222. The present application embodiment does not limit this arrangement.

[0071] By connecting the first conductive member 121 to the positive pole of the power supply and arranging it between the first sub-conductive member 1221 and the second sub-conductive member 1222, the current can flow into the first sub-conductive member 1221 and the second sub-conductive member 1222 respectively through the first region 210 in the direction of travel of the pole piece 200 and in the opposite direction of travel of the pole piece 200, thereby avoiding leakage on one side of the conductive member caused by only two conductive members being connected to the power supply, thereby improving the current utilization rate of the pole piece 200 and reducing energy consumption.

[0072] According to some embodiments of the present application, Figure 3 Figure 4 As shown, at least one of the first conductive member 121 and the second conductive member 122 includes a first conductive voltage roller 123; the central axis of the first conductive voltage roller 123 is parallel to the first direction, and the length of the first conductive voltage roller 123 along the first direction is the same as the width of the first region 210 along the first direction; wherein the first direction is perpendicular to the moving direction of the pole piece 200 and parallel to the surface of the first region 210.

[0073] The first conductive roller 123 is a conductive component that is used to contact the first region 210 and can roll along with the movement of the pole piece 200. The first conductive roller 123 is a cylindrical structure, the central axis of which is parallel to the first direction, the first direction is perpendicular to the travel direction of the pole piece 200 and parallel to the surface of the first region 210, and the current is transmitted through the outer surface of the first conductive roller 123 in contact with the first region 210.

[0074] In some embodiments, the length of the first conductive roller 123 along the first direction is the same as the width of the first region 210 along the first direction.

[0075] In some embodiments, the first conductive voltage roller 123 has a power source, and the first conductive voltage roller 123 can rotate under the action of its own power source, and can assist in conveying the pole piece 200. In some embodiments, the first conductive voltage roller 123 does not have a power source, and driven by the movement of the pole piece 200, the first conductive voltage roller 123 rotates based on the friction between the pole piece 200. The first conductive voltage roller 123 and the pole piece 200 are in contact through rolling friction, which can reduce friction resistance, thereby facilitating the stability of the pole piece structure.

[0076] In some embodiments, the first conductive member 121 includes a first conductive roller 123, and the second conductive member 122 includes a metal conductive brush, which can contact the first area 210 of the pole piece 200 to achieve a conductive connection. It is understandable that the metal conductive brush can abut against the pole piece 200 by elastic bending and deformation to maintain reliable contact between the two. In some embodiments, the first conductive member 121 includes a metal conductive block, and the second conductive member 122 includes a first conductive roller 123. The metal conductive block can be a metal of any block structure, and the metal conductive block can be rigidly fixed and directly abut against the first area 210 of the pole piece 200 to achieve a conductive connection between the two. In some embodiments, the first conductive member 121 and the second conductive member 122 both include a first conductive roller 123, the transmission assembly 110 includes an insulating transmission roller 111, the insulating transmission roller 111 corresponds to the first conductive roller 123, the pole piece 200 is located between the insulating transmission roller 111 and the first conductive roller 123, and the insulating transmission roller 111 is used to provide a supporting force to increase the friction between the first conductive roller 123 and the pole piece 200. Exemplarily, the insulating transmission roller 111 has a power source, and the insulating transmission roller 111 can rotate under the action of its own power source; Exemplarily, the insulating transmission roller 111 does not have a power source, and driven by the movement of the pole piece 200, the insulating transmission roller 111 rotates based on the friction between the pole piece 200 and the pole piece 200.

[0077] By adopting the first conductive voltage roller 123 and making the length of the first conductive voltage roller 123 the same as the width of the first region 210, the current can be provided to the first region 210 in a more concentrated manner, thereby improving the current utilization rate and the current utilization rate of the pole piece 200; on the other hand, the first conductive voltage roller 123 can roll the surface of the pole piece 200 by rotating, so that the burrs on the surface of the pole piece are smoothed under the action of pressure, which can play a role in assisting in removing the burrs.

[0078] According to some embodiments of the present application, Figure 3 Figure 4 As shown, the pole piece 200 includes a plurality of first regions 210 spaced apart along a first direction; at least one of the first conductive member 121 and the second conductive member 122 includes a plurality of first conductive voltage rollers 123; wherein the plurality of first conductive voltage rollers 123 are arranged along the first direction corresponding to the plurality of first regions 210, and any first conductive voltage roller 123 is in contact with the corresponding first region 210.

[0079] The pole piece 200 is provided with a plurality of first regions 210 at intervals along the first direction, for example, two first regions 210, three first regions 210, etc. are provided at intervals. The plurality of first regions 210 may be coated with the same active material or may be coated with different active materials. The embodiment of the present application does not limit this arrangement and material.

[0080] In some embodiments, the first conductive member 121 and the second conductive member 122 each include a plurality of first conductive rollers 123 ; in some embodiments, the first conductive member 121 or the second conductive member 122 includes a plurality of first conductive rollers 123 .

[0081] In some embodiments, the width of the pole piece 200 in the first direction is 1.4 meters, the width of the first region 210 in the first direction is 0.5 meters, two first regions 210 are spaced apart in the first direction of the pole piece 200, the distance between two adjacent first regions 210 is 0.2 meters, and each first region 210 is 0.1 meters away from the side of the pole piece 200.

[0082] Exemplarily, the first conductive member 121 includes two first conductive voltage rollers 123, and the second conductive member 122 includes two first conductive voltage rollers 123, that is, each first region 210 contacts two first conductive voltage rollers 123 respectively, and one first conductive voltage roller 123 in each first region 210 is connected to the positive pole of the power supply, and the other is connected to the negative pole of the power supply.

[0083] Exemplarily, the first conductive member 121 includes two first conductive voltage rollers 123, the second conductive member 122 includes a first sub-conductive member 1221 and a second sub-conductive member 1222, the first sub-conductive member 1221 and the second sub-conductive member 1222 each include two first conductive voltage rollers 123, that is, each first region 210 contacts three first conductive voltage rollers 123 respectively, the first conductive voltage roller 123 located in the middle along the traveling direction is connected to the positive pole of the power supply, and the other two are connected to the negative pole of the power supply respectively.

[0084] By arranging multiple first regions 210 at intervals in the first direction of the pole piece 200, the production efficiency of the pole piece 200 can be improved. At the same time, each first region 210 contacts the first conductive member 121 and the second conductive member 122 respectively, so that each first region 210 can be heated independently, which is beneficial to the precise control of the surface treatment and improves the quality of the surface treatment.

[0085] like Figure 5 As shown, Figure 5 Schematic diagram of the contact between the pole piece and three second conductive voltage rollers provided in an embodiment of the present application.

[0086] According to some embodiments of the present application, the pole piece 200 includes a plurality of first regions 210 spaced apart along a first direction, at least one of the first conductive member 121 and the second conductive member 122 includes a second conductive voltage roller 124, and a central axis of the second conductive voltage roller 124 is parallel to the first direction; the second conductive voltage roller 124 includes a plurality of conductive portions 1241 spaced apart along the first direction and corresponding to the plurality of first regions 210, and any conductive portion 1241 is in contact with the corresponding first region 210; wherein the first direction is perpendicular to the moving direction of the pole piece 200 and parallel to the surface of the first region 210.

[0087] The pole piece 200 is provided with a plurality of first regions 210 at intervals along the first direction, for example, two first regions 210, three first regions 210, etc. are provided at intervals. The plurality of first regions 210 may be coated with the same active material or may be coated with different active materials. The embodiment of the present application does not limit this arrangement and material.

[0088] The second conductive roller 124 is a through roller extending along the width direction of the pole piece 200, and the length of the second conductive roller 124 may be equal to the width of the pole piece 200. In some embodiments, both the first conductive member 121 and the second conductive member 122 include the second conductive roller 124; in some embodiments, the first conductive member 121 or the second conductive member 122 includes the second conductive roller 124.

[0089] The second conductive voltage roller 124 is a conductive component used to contact the first region 210 and can roll with the movement of the pole piece 200, and includes a plurality of conductive parts 1241 arranged at intervals along the first direction, and the number of the conductive parts 1241 corresponds to the number of the first regions 210. It can be understood that the correspondence here can include one-to-one, that is, each conductive part 1241 contacts one first region 210, and can also include one-to-many, that is, one conductive part 1241 corresponds to multiple first regions 210. The central axis of the second conductive voltage roller 124 is parallel to the first direction, which is perpendicular to the travel direction of the pole piece 200 and parallel to the surface of the first region 210, and the outer surface of the conductive part 1241 of the second conductive voltage roller 124 contacts the first region 210 to transmit the current.

[0090] In some embodiments, there is a non-conductive portion between two adjacent conductive portions 1241, the second conductive roller 124 is at least partially a cylindrical structure, and the radius of the cross-section of the conductive portion 1241 perpendicular to the central axis is greater than the radius of the cross-section of the non-conductive portion perpendicular to the central axis, so that when the conductive portion 1241 is in contact with the first area 210, the non-conductive portion is spaced a certain distance from the second area 220 between the two adjacent first areas 210.

[0091] In some embodiments, the width of the pole piece 200 in the first direction is 1.4 meters, the width of each first region 210 in the first direction is 0.5 meters, the pole piece 200 is provided with two first regions 210 at intervals in the first direction, the interval between two adjacent first regions 210 is 0.2 meters, and each first region 210 is 0.1 meters away from the side of the pole piece 200. The first conductive member 121 includes a second conductive roller 124, the second conductive member 122 includes two second conductive rollers 124, the second conductive roller 124 includes two conductive portions 1241 arranged at intervals, the length of the conductive portion 1241 in the first direction is 0.5 meters, the interval between two adjacent conductive portions 1241 is 0.2 meters, and the conductive portions 1241 correspond one to one with the first region 210.

[0092] By arranging multiple first regions 210 at intervals in the first direction of the pole piece 200, the production efficiency of the pole piece 200 can be improved. At the same time, the second conductive voltage roller 124 is utilized and multiple conductive portions 1241 are arranged at intervals on the second conductive voltage roller 124, so that a single second conductive voltage roller 124 can perform electrical heating treatment on multiple first regions 210 at the same time, thereby simplifying the structure and improving the convenience of operation.

[0093] According to some embodiments of the present application, Figure 2 and Figure 4 As shown, the pole piece 200 also includes a second area 220 not coated with a conductive coating and located between two adjacent first areas 210, and the second conductive voltage roller 124 also includes an insulating film 1242 sleeved between two adjacent conductive parts 1241; wherein the insulating film 1242 is arranged corresponding to the second area 220, and the length of the insulating film 1242 along the first direction is the same as the width of the second area 220 along the first direction.

[0094] The area on the current collector of the pole piece 200 coated with the conductive coating is the first area 210 , and the area between two adjacent first areas 210 not coated with the conductive coating is the second area 220 .

[0095] The second conductive voltage roller 124 is a cylindrical structure, with a plurality of conductive parts 1241 arranged at intervals along the first direction, and a non-conductive part between two adjacent conductive parts 1241, which refers to a part that is not conductively connected to the pole piece 200. It is understandable that the non-conductive part can be an insulating film 1242 set on the roller surface to achieve non-conductive contact with the pole piece 200.

[0096] The insulating film 1242 is a thin film material with high resistivity for preventing current from passing through, such as a polyimide film, a silicon dioxide film, etc. The present application embodiment does not limit this material. The insulating film 1242 is sleeved on the non-conductive portion between two adjacent conductive portions 1241 to isolate the non-conductive portion from the second region 220, thereby reducing the probability of the non-conductive portion contacting the second region 220 and conducting electricity.

[0097] In some embodiments, the pole piece 200 is provided with two first regions 210 spaced apart in the first direction, and the distance between two adjacent first regions 210 is 0.2 meters, that is, the width of the second region 220 is 0.2 meters, and the distance between two adjacent conductive parts 1241 on the second conductive voltage roller 124 is 0.2 meters, that is, the length of the non-conductive part is 0.2 meters, and the length of the insulating film 1242 along the first direction is 0.2 meters, which is provided corresponding to the second region 220.

[0098] By setting an insulating film 1242 between two adjacent conductive parts 1241 and making the insulating film 1242 corresponding to the second region 220, the insulating film 1242 is used to isolate the non-conductive part and the second region 220, thereby reducing the probability of the part between the two adjacent conductive parts 1241 contacting and conducting with the second region 220, so that the current is concentrated in the first region 210, thereby improving the efficiency of electric heating of the first region 210.

[0099] According to some embodiments of the present application, Figure 1 and Figure 3 As shown, the electrode surface treatment device 100 also includes a box body 130 and a gas supply unit. The box body 130 has a accommodating cavity 133 and an inlet 131 and an outlet 132 for allowing the electrode 200 to enter and exit the accommodating cavity; the gas supply unit is used to supply protective gas to the accommodating cavity 133.

[0100] The box 130 is a device or structure for accommodating the electric heating component 120 so that the electric heating component 120 can electrically heat the electrode 200 in the accommodating cavity 133 of the box 130, such as a cube, cylinder, cuboid, etc. The embodiment of the present application does not limit this structure.

[0101] The box body 130 includes an inlet 131 , an outlet 132 and a receiving chamber 133 . The pole piece 200 enters the receiving chamber 133 from the inlet 131 . The electric heating component 120 in the receiving chamber 133 electrically heats the pole piece 200 . Then, the pole piece 200 leaves the receiving chamber 133 from the outlet 132 .

[0102] In some embodiments, the accommodating chamber 133 is connected to a gas supply unit. Before the electric heating assembly 120 works, a protective gas is supplied to the accommodating chamber 133 through the gas supply unit. The protective gas is, for example, helium, neon, nitrogen, etc. By supplying the protective gas to the accommodating chamber 133, the air in the accommodating chamber 133 is exhausted to delay oxidation of the pole piece 200.

[0103] In some embodiments, the inlet 131 and the outlet 132 of the box body 130 are provided with sealing structures, such as sealing gaskets, sealing rings, etc., to improve the sealing performance of the box body 130 and minimize the possibility of oxidation of the pole piece 200.

[0104] In some embodiments, the box body 130 is further provided with a heat-insulating cover. When the electric heating component 120 is in operation, the pole piece 200 generates heat. The heat-insulating cover is used to further reduce heat loss and improve energy utilization.

[0105] The box body 130 can slow down the interaction between the external gas and the gas in the accommodating cavity 133, so that during the processing of the pole piece 200 in the accommodating cavity 133 of the box body 130, the oxidation of the pole piece 200 can be delayed, and the heat loss can be reduced, thereby improving the energy utilization rate.

[0106] According to some embodiments of the present application, Figure 1 and Figure 3 As shown, the electrode surface treatment device 100 also includes a gas concentration sensor 140 and a controller. The gas concentration sensor 140 is arranged in the accommodating cavity 133, and the gas concentration sensor 140 is used to detect the gas concentration of the protective gas in the accommodating cavity 133; the controller is respectively connected to the gas concentration sensor 140 and the gas supply unit signal, and the controller is configured to control the gas supply unit to adjust the gas concentration in the accommodating cavity 133 according to the detection result of the gas concentration sensor 140.

[0107] The gas concentration sensor 140 is a device used to detect the concentration of a certain gas component in the surrounding environment and convert the volume fraction of a certain gas into a corresponding electrical signal, such as a semiconductor gas sensor, an electrochemical gas sensor, an infrared gas sensor, etc.; the detected protective gas is such as helium, neon, nitrogen, etc., and the embodiment of the present application does not limit this specific structure and the type of detected gas.

[0108] The gas concentration sensor 140 is disposed in the accommodating cavity 133, and the number thereof can be single or multiple; in some embodiments, the number of the gas concentration sensor 140 is multiple, one is close to the inlet 131 of the accommodating cavity 133, one is close to the outlet 132 of the accommodating cavity 133, and the remaining gas concentration sensors 140 are arranged at intervals between the inlet 131 and the outlet 132.

[0109] The controller is respectively connected to the gas concentration sensor 140 and the gas supply unit by signal. The gas concentration of the protective gas collected by the gas concentration sensor 140 can be sent to the controller by signal transmission. The controller sends corresponding control and adjustment information to the gas supply unit by signal transmission based on the detection result. The signal connection can be a wired connection, that is, the signal is transmitted through a data line; or a wireless connection, that is, the signal is transmitted through a wireless network.

[0110] The controller can process the gas concentration collected by the gas concentration sensor 140, for example, compare the gas concentration with the preset protective gas concentration, and output corresponding operation information according to the preset conditions. The controller can be a microcontroller (MCU) or a digital signal processor (DSP), etc.

[0111] In some embodiments, the preset threshold value of the concentration of the protective gas is 99%. The gas concentration sensor 140 collects the gas concentration of the containing chamber 133 and transmits it to the controller. The controller determines that the detected gas concentration is less than the preset concentration threshold value. The controller sends a gas supply signal to the gas supply unit based on the detection result. The gas supply unit supplies protective gas into the containing chamber 133 to increase the protective gas concentration in the containing chamber 133.

[0112] In some embodiments, the preset threshold value of the concentration of the protective gas is 99%. The gas concentration sensor 140 collects the gas concentration of the accommodating chamber 133 and transmits it to the controller. The controller determines that the detected gas concentration is greater than or equal to the preset concentration threshold value. Based on the detection result, the controller does not need to send a gas supply signal to the gas supply unit, or send a standby signal to the gas supply unit, and does not need to supply protective gas to the accommodating chamber 133.

[0113] It should be noted that the gas supply unit may supply the protective gas before the electric heating treatment, or may supply the protective gas during the electric heating treatment.

[0114] By setting up a gas concentration sensor 140 and a controller, the gas concentration sensor 140 is used to collect the gas concentration in the accommodating cavity 133 in real time, so that the gas concentration in the accommodating cavity 133 can be adjusted in real time according to demand to reduce the probability of oxidation of the electrode 200 during the electrical heating treatment.

[0115] According to some embodiments of the present application, Figure 1 and Figure 3 As shown, the pole piece surface treatment device 100 also includes a deviation correction component 150 , which is arranged upstream of the electric heating component 120 along the travel direction of the pole piece 200 , and is used to correct the deviation of the pole piece 200 before it contacts the electric heating component 120 .

[0116] The deflection correction component 150 is a device for detecting the position of the pole piece 200 and adjusting the position of the pole piece 200. For example, a deflection correction roller, a robot, etc., and the embodiment of the present application does not limit this specific structure.

[0117] In some embodiments, the deflection correction component 150 includes a deflection correction sensor and a deflection correction execution unit. The deflection correction sensor is arranged upstream of the deflection correction execution unit along the moving direction of the pole piece 200, and the deflection correction execution unit is arranged upstream of the electric heating component 120. The position of the pole piece 200 is detected by the deflection correction sensor. When it is detected that the pole piece 200 is offset along its own width direction, the deflection correction sensor transmits a signal to the controller, and the controller controls the deflection correction execution unit to adjust the position of the pole piece 200 so that the pole piece 200 can pass through the electric heating component 120 smoothly during the process.

[0118] Among them, the correction sensor can be but not limited to being set as an infrared sensor, and the correction execution unit can be but not limited to being set as a correction roller. The position of the pole piece 200 along its own width direction is detected by the infrared sensor, and then the correction roller is controlled based on the detection result to drive the pole piece 200 thereon to move along the width direction, thereby adjusting the position of the pole piece 200 in the width direction.

[0119] By providing the deviation correction component 150 , the position of the pole piece 200 can be adjusted in real time, so that the pole piece 200 can better contact with the first conductive member 121 and the second conductive member 122 , thereby improving the quality of the pole piece surface treatment.

[0120] According to some embodiments of the present application, the electric heating component 120 further includes a current regulating module connected to the power supply, and the current regulating module is used to regulate the current of the electric heating circuit.

[0121] The current regulating module can be a unit module connected to the electric heating circuit, or a control unit module that directly acts on the power supply, such as a unit module integrated in a power management system or a power controller. The current regulating module is an electronic device used to adjust and control the current in the circuit, such as a bipolar transistor current regulating module, a field effect transistor current regulating module, etc. The embodiment of the present application does not limit this specific type.

[0122] In some embodiments, the current regulation module is a bipolar transistor current regulation module. The bipolar transistor mainly regulates the collector current and the emitter current by controlling the base current. A forward voltage is applied between the emitter and the base. When the base voltage increases, the forward bias voltage of the emitter junction increases, so that more carriers are injected from the emitter to the base, the base current increases, and the collector current also increases; conversely, when the base voltage decreases, the base current decreases, and the collector current also decreases accordingly.

[0123] In some embodiments, the current regulating module is a field effect transistor current regulating module. The field effect transistor is a voltage-controlled device that controls the current between the drain and the source by changing the voltage between the gate and the source. When the gate voltage changes, the charge concentration and distribution in the channel will change, thereby affecting the resistance of the channel, thereby controlling the size of the drain current.

[0124] It should be noted that the current regulating module, as any regulating module, can adjust the current by receiving control instructions from the controller.

[0125] In some embodiments, the current regulating module may be integrated into the first conductive member 121 or the second conductive member 122 ; in some embodiments, the current regulating module may be a separate component electrically connected to the first conductive member 121 or the second conductive member 122 .

[0126] In some embodiments, the resistance R of the conductive coating 1 , the current I passing through the conductive coating 1 , according to the electric effect heat power P 1 =I 1 2 R 1 It can be seen that the larger the current, the greater the electric effect heat power P 1 The larger the value, according to the thermodynamic formula, P 1 t=c 1 m 1 ΔT 1 It can be seen that the thermal power P 1 The larger the temperature change per unit time, ΔT 1 The larger the ΔT 1 The larger the value, the greater the temperature change per unit time, that is, the faster the heating rate. At the same time, the greater the temperature change, the higher the maximum temperature that can be achieved. Therefore, the current in the electric heating circuit can be increased through the current regulation module to increase the heating rate and the maximum temperature that can be achieved.

[0127] By setting up a current regulation module, the current of the electric heating circuit is adjusted in real time according to demand, so that the electrode 200 can be in a more suitable temperature state. On the one hand, burrs can be removed, and on the other hand, the impact of the high temperature generated by heating on the surface of the electrode 200 can be reduced.

[0128] According to some embodiments of the present application, Figure 1 and Figure 3As shown, the electrode surface treatment device 100 also includes a temperature sensor 160 and a controller. The temperature sensor 160 is arranged downstream of the electric heating component 120 along the moving direction of the electrode 200, and the temperature sensor 160 is used to detect the surface temperature of the first area 210 after being treated by the electric heating component 120; the controller is respectively connected to the temperature sensor 160 and the current regulation module signal, and the controller is configured to control the current regulation module to adjust the current of the electric heating circuit according to the detection result of the temperature sensor 160.

[0129] It should be noted that during the high-temperature treatment of the electrode 200, the treatment temperature needs to be controlled so that the surface temperature of the electrode 200 can be maintained within a certain range after the surface treatment. If the surface temperature of the electrode 200 after the high-temperature treatment is too low, the burrs on the surface of the electrode 200 may not be completely removed, or the elastic deformation of the electrode 200 itself may not be fully released. If the surface temperature of the electrode 200 after the high-temperature treatment is too high, oxidation may occur in the area of ​​the electrode 200 that is not coated with the conductive coating. Therefore, after the electrode 200 is electrically heated by the electric heating component 120, the surface temperature of the electrode 200 can be detected by the temperature sensor 160 to provide timely feedback on the condition of the electrode 200 after the high-temperature treatment.

[0130] The temperature sensor 160 is a device used to detect the temperature in the surrounding environment and convert it into a corresponding electrical signal. It can be a contact temperature sensor, such as a thermistor temperature sensor, a thermocouple temperature sensor, etc.; it can also be a non-contact temperature sensor, such as a radiation temperature sensor, an infrared temperature sensor, etc. The embodiment of the present application does not limit this specific type.

[0131] The temperature sensor 160 is disposed in the accommodating cavity 133, and the number thereof can be single or multiple; in some embodiments, the temperature sensor 160 is disposed downstream of the electric heating component 120 to detect the surface temperature of the first area 210 after being processed by the electric heating component 120; in some embodiments, the accommodating cavity 133 is also additionally provided with a temperature sensor 160 for detecting the temperature of the accommodating cavity 133.

[0132] The controller is connected to the temperature sensor 160 and the current regulation module respectively. The temperature sensor 160 detects the surface temperature of the first area 210 after being processed by the electric heating component 120, and sends it to the controller through signal transmission. The controller sends corresponding control adjustment information to the current regulation module through signal transmission based on the detection result.

[0133] In some embodiments, the preset temperature range of the surface temperature of the first area 210 after being processed by the electric heating component 120 is 200℃-350℃, and the surface temperature detected by the temperature sensor 160 is transmitted to the controller. The controller determines that the detected surface temperature is less than 200℃, and the controller sends a signal to the current regulation module to increase the current in the electric heating circuit based on the detection result; the controller determines that the detected surface temperature is between 200℃-350℃, and the controller does not need to send an adjustment signal to the current regulation module based on the detection result; the controller determines that the detected surface temperature is greater than 350℃, and the controller sends a signal to the current regulation module to reduce the current in the electric heating circuit based on the detection result.

[0134] By setting up a temperature sensor 160 and a controller, the temperature sensor 160 is used to collect in real time the surface temperature of the first area 210 after being treated by the electric heating component 120, so as to understand the state of the electrode 200 after the electric heating treatment, so as to make corresponding adjustments to the surface treatment process of the electrode 200, so as to keep the electrode 200 in a suitable temperature range and improve the quality of the electrode 200.

[0135] According to some embodiments of the present application, Figure 1 and Figure 3 As shown, the electrode surface treatment device 100 also includes a thickness measuring instrument 170 and a controller. The thickness measuring instrument 170 is arranged downstream of the electric heating component 120 along the moving direction of the electrode 200, and the thickness measuring instrument 170 is used to detect the thickness of the first area 210 after being processed by the electric heating component 120; the controller is respectively connected to the thickness measuring instrument 170 and the current regulation module signal, and the controller is configured to control the current regulation module to adjust the current of the electric heating circuit according to the detection result of the thickness measuring instrument 170.

[0136] It should be noted that after the pole piece 200 is subjected to high temperature treatment, the elastic deformation of the pole piece 200 is released in advance, which will affect the thickness of the pole piece 200. If the thickness of the pole piece 200 after the electric heating treatment changes too little or changes too much, it may be that the heating temperature of the electric heating component 120 does not reach the expected range, resulting in the elastic deformation of the pole piece 200 not being fully released; or the heating temperature of the electric heating component 120 exceeds the expected range, resulting in the structure of the pole piece 200 being damaged. Therefore, after the pole piece 200 is subjected to the electric heating treatment of the electric heating component 120, the thickness of the pole piece 200 can be detected by the thickness measuring instrument 170 to determine the effect of the release of the elastic deformation of the pole piece 200 after the high temperature treatment.

[0137] The thickness measuring instrument 170 is an instrument used to measure the thickness of the electrode 200 after the electric heating treatment by the electric heating component 120, such as an ultrasonic thickness measuring instrument, a laser thickness measuring instrument, etc. The embodiment of the present application does not limit this specific type.

[0138] In some embodiments, there are multiple thickness measuring instruments 170, one of which is arranged upstream of the electric heating component 120 along the moving direction of the pole piece 200, and the other is arranged downstream of the electric heating component 120. The expansion rate of the thickness of the first region 210 is determined by obtaining the thickness of the pole piece 200 before and after being processed by the electric heating component 120; in some embodiments, there is a single thickness measuring instrument 170, which is arranged downstream of the electric heating component 120 along the moving direction of the pole piece 200. The thickness of the pole piece 200 before electric heating can be entered in advance and stored in the storage unit of the controller, or it can be transmitted to the storage unit of the controller by other related detection programs.

[0139] The controller is connected to the thickness measuring instrument 170 and the current regulating module respectively. The thickness measuring instrument 170 detects the thickness of the electrode 200 processed by the electric heating component 120 and sends it to the controller through signal transmission. The controller sends corresponding control adjustment information to the current regulating module through signal transmission based on the detection result.

[0140] In some embodiments, the preset expansion range of the first area 210 after being processed by the electric heating component 120 is 7%-9%, and the thickness detected by the thickness measuring instrument 170 is transmitted to the controller. When the expansion rate is detected to be less than 7%, the controller sends a signal to the current regulation module to increase the current in the electric heating circuit based on the detection result; when the expansion change rate is detected to be between 7%-9%, the controller does not need to send an adjustment signal to the current regulation module based on the detection result; when the expansion change rate is detected to be greater than 9%, the controller sends a signal to the current regulation module to reduce the current in the electric heating circuit based on the detection result.

[0141] By setting up a thickness measuring instrument 170 and a controller, the thickness of the electrode 200 after being treated by the electric heating component 120 can be detected in real time using the thickness measuring instrument 170, so as to understand the state of the electrode 200 after the electric heating treatment and make corresponding adjustments to the surface treatment process of the electrode so that the electrode 200 is within a suitable temperature range, which is beneficial to releasing the elastic deformation of the electrode 200.

[0142] An embodiment of the present application provides a battery production device, which includes a pole piece surface treatment device 100 according to any of the above embodiments.

[0143] like Figure 6 As shown, Figure 6 A schematic flow chart of a method for processing the surface of a pole piece provided in an embodiment of the present application.

[0144] The embodiment of the present application provides a method for processing a pole piece surface, and the processing method 300 includes: Step S310 , conveying the pole piece 200 along a preset moving direction, wherein the pole piece 200 includes a first area 210 coated with a conductive coating.

[0145] Step S320, the first area 210 of the pole piece 200 is contacted with the first conductive member 121 and the second conductive member 122 of the electric heating component 120 respectively, the first conductive member 121 is used to connect to the positive pole of the power supply, and the second conductive member 122 is used to connect to the negative pole of the power supply. The first area 210 of the pole piece 200 is located between the first conductive member 121 and the second conductive member 122 to form an electric heating circuit with the first conductive member 121, the second conductive member 122, and the power supply.

[0146] Step S330 , controlling the electric heating component 120 to electrically heat the portion of the first region 210 of the electrode 200 that is in the electric heating loop.

[0147] The method for processing the surface of a pole piece disclosed in the embodiment of the present application can be applied to any device that uses electric heating to process burrs on the surface of a pole piece.

[0148] Step S310, start the transmission component 110, control the transmission component 110 to transmit the pole piece 200, the transmission speed of the pole piece 200 can be determined according to demand, such as 5m / min, 10m / min, etc. The pole piece 200 includes a current collector and a conductive coating, and the first area 210 is coated with a conductive coating on the current collector.

[0149] In some embodiments, the electrode surface treatment device 100 includes a box 130 , and the conveying assembly 110 delivers the electrode 200 into the accommodating chamber 133 through the inlet 131 and leaves the accommodating chamber 133 from the outlet 132 .

[0150] Step S320, controlling the transmission of the electrode 200 so that the first region 210 of the electrode 200 contacts the first conductive member 121 and the second conductive member 122 respectively during the movement, controlling the first conductive member 121 to be connected to the positive pole of the power supply, and controlling the second conductive member 122 to be connected to the negative pole of the power supply, so that the first conductive member 121, the first region 210, the second conductive member 122 and the power supply can form an electric heating circuit.

[0151] Step S330, control the first conductive member 121 and the second conductive member 122 to be energized, the current flows out from the first conductive member 121 through the first region 210 and flows into the second conductive member 122, forming an electric heating loop. When the current passes through the first region 210, the temperature of the first region 210 will rise. When the temperature of the first region 210 rises to a preset temperature, the burrs on the surface of the electrode will be melted at high temperature.

[0152] By electrically heating the first area 210 between the first conductive member 121 and the second conductive member 122, the burrs on the surface of the pole piece can be melted at high temperature, thereby achieving the removal of the burrs on the surface of the pole piece; the power-on treatment method is easy to operate. On the one hand, it can quickly increase the temperature of the pole piece 200, which helps to improve the efficiency of burr removal and reduce energy consumption; on the other hand, it can improve the consistency of the surface temperature of the pole piece, which is beneficial to maintaining the stability of the structure of the pole piece 200, and release the elastic deformation in advance, thereby improving the quality of the pole piece 200.

[0153] like Figure 7 As shown, Figure 7 A schematic flow chart of another method for processing the surface of a pole piece provided in an embodiment of the present application.

[0154] According to some embodiments of the present application, step S330, controlling the electric heating component to perform electric heating on the portion of the first region 210 of the electrode 200 that is in the electric heating loop, further includes: Step S331 , obtaining the surface temperature of the first region 210 of the electrode 200 after being processed by the electric heating component 120 .

[0155] Step S332: adjusting the current of the electric heating circuit based on the surface temperature.

[0156] Step S331 , controlling the temperature sensor 160 to detect the surface temperature of the first area 210 after being processed by the electric heating component 120 .

[0157] Step S332, control the temperature sensor 160 to send the surface temperature of the first area 210 processed by the electric heating component 120 to the controller through signal transmission, and the controller sends corresponding control adjustment information to the current regulation module through signal transmission based on the detection result.

[0158] By using the temperature sensor 160 to collect the surface temperature of the first area 210 after being treated by the electric heating component 120 in real time, it is convenient to grasp the state of the electrode 200 after the electric heating treatment, so as to make corresponding adjustments to the surface treatment process of the electrode 200, so as to keep the electrode 200 in a suitable temperature range and improve the quality of the electrode 200.

[0159] According to some embodiments of the present application, step S332, adjusting the current of the electric heating circuit based on the surface temperature includes: step S3321, increasing the current of the electric heating circuit in response to the surface temperature being less than a first preset temperature threshold.

[0160] According to some embodiments of the present application, step S332, adjusting the current of the electric heating circuit based on the surface temperature includes: Step S3322: In response to the surface temperature being greater than a second preset temperature threshold, reducing the current of the electric heating circuit.

[0161] The first preset temperature threshold is smaller than the second preset temperature threshold.

[0162] After executing step S331 and obtaining the surface temperature of the first area 210 after being processed by the electric heating component 120, step S332 is executed. Step S332 includes step S3321 and step S3322. Step S3321 and step S3322 are parallel steps. Either one of them is executed, or neither is executed.

[0163] Step S3321, control the temperature sensor 160 to send the surface temperature of the first area 210 processed by the electric heating component 120 to the controller through signal transmission, and the controller compares the obtained temperature with the first preset temperature threshold. If the obtained temperature is less than the first preset temperature threshold, the controller sends control adjustment information to increase the current in the electric heating circuit to the current regulation module through signal transmission based on the detection result. The first preset temperature threshold is, for example, 200°C, 220°C, etc.

[0164] Step S3322, control the temperature sensor 160 to send the surface temperature of the first area 210 processed by the electric heating component 120 to the controller through signal transmission, and the controller compares the acquired temperature with the second preset temperature threshold. If the acquired temperature is greater than the second preset temperature threshold, the controller sends control adjustment information to reduce the current in the electric heating circuit to the current regulation module through signal transmission based on the detection result. The second preset temperature threshold is, for example, 300°C, 350°C, etc.

[0165] In some embodiments, step S332 also includes step S3323, and step S3321, step S3322, and step S3323 are parallel steps, and one of the three is selected for execution. The controller compares the acquired temperature with the first preset temperature threshold and the second preset temperature threshold, respectively. If the acquired temperature is greater than the first preset temperature threshold and less than the second preset temperature threshold, the controller does not need to send an adjustment signal to the current regulation module based on the detection result, or send a control instruction to maintain the original state.

[0166] By acquiring the surface temperature of the first area 210 after being processed by the electric heating component 120 , the current of the electric heating loop is adjusted accordingly according to the temperature feedback, so that the electrode 200 is in a suitable temperature range, thereby improving the quality of the electrode 200 .

[0167] According to some embodiments of the present application, the value range of the first preset temperature threshold is 200°C-220°C; according to some embodiments of the present application, the value range of the second preset temperature threshold is 330°C-350°C.

[0168] In executing step S3321, the value range of the first preset temperature threshold is 200℃-220℃. The controller compares the acquired temperature with the first preset temperature threshold. If the acquired temperature is less than 200℃, the controller determines that the heating temperature is too low. Based on the detection result, the controller sends control adjustment information to the current regulation module through signal transmission to increase the current in the electric heating circuit. When the current increases, the heat generated in the first area 210 increases, so that the temperature of the first area 210 can exceed 200℃.

[0169] In executing step S3322, the value range of the second preset temperature threshold is 330℃-350℃. The controller compares the acquired temperature with the second preset temperature threshold. If the acquired temperature is greater than 350℃, the controller determines that the heating temperature is too high. Based on the detection result, the controller sends control adjustment information to the current regulation module through signal transmission to reduce the current in the electric heating circuit. When the current decreases, the heat generated in the first area 210 decreases, so that the temperature of the first area 210 drops to below 350℃.

[0170] By reasonably selecting the first preset temperature threshold and the second preset temperature threshold, on the one hand, burrs can be effectively removed, and on the other hand, the stability of the pole piece 200 structure can be maintained, and deformation of the pole piece 200 structure can be avoided as much as possible, thereby improving the quality of the pole piece 200.

[0171] According to some embodiments of the present application, Figure 7 As shown, step S330, controlling the electric heating component 120 to perform electric heating on the first area 210 of the electrode 200 in the electric heating loop, further includes: Step S333, obtaining a first thickness of a first region of the electrode after being processed by the electric heating component.

[0172] Step S334: adjusting the current of the electric heating circuit based on the first thickness.

[0173] Step S333 and step S331 are parallel steps. Step S332 is executed after step S331 is executed, and step S334 is executed after step S333 is executed. There is no order of execution between step S333 and step S331. Step S333 and step S331 can be executed simultaneously or sequentially. The embodiment of the present application does not limit the execution order.

[0174] Step S333 , controlling the thickness measuring instrument 170 to detect the first thickness of the first region 210 processed by the electric heating component 120 .

[0175] Step S334, control the thickness measuring instrument 170 to send the first thickness of the first area 210 processed by the electric heating component 120 to the controller through signal transmission. Based on the detection result, the controller sends corresponding control adjustment information to the current regulation module through signal transmission to adjust the current of the electric heating circuit.

[0176] By using the thickness measuring instrument 170 to detect in real time the thickness of the pole piece 200 after being treated by the electric heating component 120, it is convenient to understand the state of the pole piece 200 after the electric heating treatment, so as to make corresponding adjustments to the surface treatment process of the pole piece 200, so that the pole piece 200 is in a suitable temperature range, which is conducive to releasing the elastic deformation of the pole piece 200.

[0177] According to some embodiments of the present application, step S334, adjusting the current of the electric heating loop based on the first thickness, includes: Step S3341 , obtaining a second thickness of the first region 210 of the electrode 200 before being processed by the electric heating component 120 .

[0178] Step S3342: determining an expansion rate of the first region 210 based on the first thickness and the second thickness, where the expansion rate is a ratio of a difference between the first thickness and the second thickness to the second thickness.

[0179] Step S3343: In response to the expansion rate being less than a preset expansion threshold, the current of the electric heating circuit is increased, and the expansion rate is the ratio of the difference between the first thickness and the second thickness to the second thickness.

[0180] Step S3341 , controlling the thickness measuring instrument 170 to detect the second thickness of the first region 210 before being processed by the electric heating component 120 .

[0181] Step S3342, control the thickness measuring instrument 170 to send the detected first thickness and second thickness to the controller via signal transmission, and the controller obtains the expansion rate of the first area 210 after the electric heating treatment through the processor, and the expansion rate is the ratio of the difference between the first thickness and the second thickness to the second thickness.

[0182] Step S3343: The controller compares the processed expansion rate with the preset expansion threshold. If the processed expansion rate is smaller than the preset expansion threshold, the controller sends control adjustment information to increase the current in the electric heating circuit to the current regulation module through signal transmission based on the detection result.

[0183] In some embodiments, the preset expansion threshold range is 7%-9%. If the expansion rate is less than 7%, the controller determines that the heating temperature is too low, and the controller sends control adjustment information to the current regulation module to increase the current in the electric heating circuit based on the detection result through signal transmission; if the expansion rate is greater than 9%, the controller determines that the heating temperature is too high, and the controller sends control adjustment information to the current regulation module to reduce the current in the electric heating circuit based on the detection result through signal transmission.

[0184] By controlling the expansion rate of the first region 210 within a preset expansion threshold range, the elastic deformation of the pole piece 200 is fully released, which is beneficial to improving the quality of the pole piece 200 .

[0185] According to some embodiments of the present application, Figure 7 As shown, the electric heating assembly 120 is disposed in the accommodating cavity 133 of the box 130; in step S310, before the pole piece 200 is transported along a preset moving direction, and the pole piece 200 includes a first area 210 coated with a conductive coating, the processing method 300 further includes: Step S340 , supplying protective gas into the accommodating chamber 133 until the gas concentration of the protective gas in the accommodating chamber 133 reaches a preset concentration threshold.

[0186] Before executing step S310 and transferring the pole piece 200 along the preset moving direction, step S340 is first executed.

[0187] Step S340, start the gas supply unit to supply protective gas to the accommodating chamber 133 of the box body 130, until the gas concentration of the protective gas in the accommodating chamber 133 reaches a preset concentration threshold, the preset concentration threshold is, for example, 98%, 99%, etc. For ease of description, the preset concentration threshold is 99% as an example. The control gas concentration sensor 140 collects the gas concentration of the protective gas in the accommodating chamber 133, and sends the collection result to the controller through signal transmission. The controller sends corresponding control adjustment information to the gas supply unit through signal transmission based on the detection result.

[0188] Exemplarily, if the controller determines that the collected gas concentration is less than 99%, the controller sends the gas supply adjustment information to the gas supply unit through signal transmission. Exemplarily, if the controller determines that the collected gas concentration is greater than or equal to 99%, the controller sends the gas supply unit through signal transmission to stop supplying gas.

[0189] In some embodiments, before executing step S310 and conveying the pole piece 200 along a preset direction of travel, the deviation correction component 150 may be controlled to adjust the position of the pole piece 200 so that the pole piece 200 can pass smoothly through the electric heating component 120 during the process.

[0190] By supplying protective gas to the accommodating cavity 133 in advance, the electrode piece 200 can be electrically heated in an environment of the protective gas, thereby reducing the probability of oxidation of the electrode piece 200 during the electrical heating treatment.

[0191] According to some embodiments of the present application, Figure 7 As shown, the processing method 300 also includes: Step S350 , obtaining the gas concentration of the protective gas in the containing chamber 133 during the electric heating process.

[0192] Step S360 , in response to the gas concentration being lower than a preset concentration threshold, adding protective gas into the containing chamber 133 .

[0193] While executing step S330 and controlling the electric heating assembly 120 to electrically heat the first region 210 of the electrode 200 in the electric heating circuit, step S350 may also be executed. It should be noted that the term "simultaneously" herein may be understood as executing step S330 first and then executing step S350 during the execution of step S330.

[0194] Step S350 , during the period of the electric heating treatment of the electrode piece 200 , the gas concentration sensor 140 is controlled to collect the gas concentration of the protective gas in the accommodating cavity 133 in real time.

[0195] Step S360, control the gas concentration sensor 140 to collect the gas concentration of the protective gas in the accommodating chamber 133 and send it to the controller through signal transmission. The controller compares the acquired gas concentration with the preset concentration threshold. If the acquired gas concentration is lower than the preset concentration threshold, the controller sends the adjustment information of the supply gas to the gas supply unit through signal transmission based on the detection result. The gas supply unit supplies the protective gas to the accommodating chamber 133 until the gas concentration in the accommodating chamber 133 reaches the preset concentration threshold, and then stops the supply of the protective gas.

[0196] By detecting the gas concentration of the protective gas in the accommodating chamber 133 in real time during the electric heating treatment and supplying the protective gas as needed, the electrode 200 can be continuously in the protective gas environment for electric heating treatment, which can reduce the probability of oxidation of the electrode 200 during the electric heating treatment and improve the quality of the electrode 200.

[0197] According to some embodiments of the present application, step 330, controlling the electric heating component 120 to perform electric heating on the portion of the first region 210 of the electrode 200 that is in the electric heating loop, further includes: Step 335, control the electric heating component 120 to heat the portion of the first area 210 of the electrode 200 that is in the electric heating circuit, so that the surface temperature of the portion of the first area 210 of the electrode 200 that is in the electric heating circuit rises to a preset temperature range within a preset time period after the start of the electric heating process; wherein the preset time period is less than or equal to 1s, and the preset temperature range is 200°C-350°C.

[0198] There is no order of execution between step 335 , step 331 and step 332 . For example, step 331 and step 332 can be executed after step 335 .

[0199] In step S335, the preset time period can be 0.1s, 0.2s, 0.4s, 0.6s, 0.8s or 1s, or a value between any adjacent values ​​mentioned above. The preset temperature range is set to take into account the possible differences due to the inconsistency of the temperature rise rates in different regions, or the temperature fluctuations caused by other interference factors, so as to improve the quality and uniformity of the surface treatment of the pole piece as much as possible. The preset temperature can be 200℃, 220℃, 250℃, 280℃, 300℃, 320℃ or 350℃, etc.

[0200] By raising the temperature of the first region 210 between the first conductive member 121 and the second conductive member 122 to between 200°C and 350°C within 1 second, the burr removal efficiency is improved on the one hand, and the influence time of high temperature on the pole piece surface is reduced as much as possible on the other hand, thereby protecting the pole piece structure.

[0201] According to some embodiments of the present application, Figure 3 and Figure 4 As shown, the electrode surface treatment device 100 includes a conveying component 110 , an electric heating component 120 , a box 130 , a gas concentration sensor 140 , a deviation correction component 150 , a temperature sensor 160 and a thickness measuring instrument 170 .

[0202] The electric heating component 120 is located in the accommodating cavity 133 of the box 130. The electric heating component 120 includes a first conductive member 121 for connecting to the positive electrode of the power supply and a second conductive member 122 for connecting to the negative electrode of the power supply. The second conductive member 122 includes a first sub-conductive member 1221 and a second sub-conductive member 1222 arranged at intervals along the travel direction of the pole piece 200. The first conductive member 121 is located between the first sub-conductive member 1221 and the second sub-conductive member 1222 along the travel direction of the pole piece 200. The first region 210 of the pole piece 200 is located at the first conductive member 121 and the first sub-conductive member 1221 to form an electric heating circuit with the first conductive member 121, the first sub-conductive member 1221, and the power supply. The first region 210 of the pole piece 200 is located at the first conductive member 121 and the second sub-conductive member 1222 to form an electric heating circuit with the first conductive member 121, the second sub-conductive member 1222, and the power supply.

[0203] The pole piece 200 includes a plurality of first regions 210 spaced apart along a first direction; the first conductive member 121 and the second conductive member 122 each include a plurality of first conductive rollers 123; the central axis of the first conductive roller 123 is parallel to the first direction, and the length of the first conductive roller 123 along the first direction is the same as the width of the first region 210 along the first direction, and the plurality of first conductive rollers 123 are arranged corresponding to the plurality of first regions 210 along the first direction, and any first conductive roller 123 contacts the corresponding first region 210. The first direction is perpendicular to the traveling direction of the pole piece 200 and parallel to the surface of the first region 210.

[0204] The deviation correction component 150 is disposed upstream of the electric heating component 120 along the travel direction of the pole piece 200 , and is used to correct the deviation of the pole piece 200 before the electric heating component 120 contacts it.

[0205] The gas concentration sensor 140 is disposed in the accommodating chamber 133 , and is used to detect the gas concentration in the accommodating chamber 133 , and to adjust the concentration of the protective gas in the accommodating chamber 133 by using the gas supply unit through the controller.

[0206] The temperature sensor 160 is disposed downstream of the electric heating assembly 120 along the moving direction of the electrode 200 , and is used to detect the surface temperature of the first region 10 after being processed by the electric heating assembly 120 .

[0207] The thickness measuring instrument 170 is disposed downstream of the electric heating assembly 120 along the travel direction of the pole piece 200, and is used to detect the thickness of the first area 210 after being processed by the electric heating assembly 120. The controller controls the current regulating module to adjust the current of the electric heating circuit according to the surface temperature and thickness of the first area 210.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pole piece surface treatment device, characterized in that: include: A conveying assembly for conveying a pole piece, wherein the pole piece includes a first area coated with a conductive coating; An electric heating assembly, comprising a first conductive member for connecting to a positive electrode of a power source and a second conductive member for connecting to a negative electrode of the power source; The first conductive member and the second conductive member are spaced apart and respectively contact the first region of the pole piece, so that the first region of the pole piece located between the first conductive member and the second conductive member forms an electric heating circuit with the first conductive member, the second conductive member and the power supply.

2. The pole piece surface treatment device according to claim 1, characterized in that: The first conductive member and the second conductive member are arranged at intervals along the travel direction of the pole piece.

3. The pole piece surface treatment device according to claim 2, characterized in that: The second conductive member includes a first sub-conductive member and a second sub-conductive member which are arranged at intervals along the travel direction of the pole piece, and the first sub-conductive member and the second sub-conductive member are both connected to the negative electrode of the power supply; Wherein, the first conductive member is located between the first sub-conductive member and the second sub-conductive member along the moving direction of the pole piece.

4. The pole piece surface treatment device according to claim 2 or 3, characterized in that: At least one of the first conductive member and the second conductive member comprises a first conductive roller; The central axis of the first conductive roller is parallel to the first direction, and the length of the first conductive roller along the first direction is the same as the width of the first region along the first direction; The first direction is perpendicular to the moving direction of the pole piece and parallel to the surface of the first region.

5. The pole piece surface treatment device according to claim 4, characterized in that: The pole piece includes a plurality of the first regions spaced apart along the first direction; at least one of the first conductive member and the second conductive member includes a plurality of the first conductive rollers; The plurality of first conductive voltage rollers are arranged along the first direction corresponding to the plurality of first regions, and any of the first conductive voltage rollers is in contact with the corresponding first region.

6. The pole piece surface treatment device according to claim 2 or 3, characterized in that: The pole piece includes a plurality of the first regions spaced apart along a first direction, at least one of the first conductive member and the second conductive member includes a second conductive roller, and a central axis of the second conductive roller is parallel to the first direction; The second conductive roller includes a plurality of conductive portions spaced apart along the first direction and arranged corresponding to the plurality of first regions, and any of the conductive portions is in contact with the corresponding first region; The first direction is perpendicular to the moving direction of the pole piece and parallel to the surface of the first region.

7. The pole piece surface treatment device according to claim 6, characterized in that: The pole piece further includes a second area located between two adjacent first areas and not coated with a conductive coating, and the second conductive voltage roller further includes an insulating film sleeved between two adjacent conductive parts; The insulating film is arranged corresponding to the second region, and the length of the insulating film along the first direction is the same as the width of the second region along the first direction.

8. The pole piece surface treatment device according to any one of claims 1 to 3, characterized in that: Also includes: A box body having a containing cavity and an inlet and an outlet for allowing the pole piece to enter and exit the containing cavity; as well as The gas supply unit is used to supply protective gas into the containing chamber.

9. The pole piece surface treatment device according to claim 8, characterized in that: Also includes: A gas concentration sensor is disposed in the accommodating chamber, and is used to detect the gas concentration of the protective gas in the accommodating chamber; A controller is signal-connected to the gas concentration sensor and the gas supply unit, respectively, and is configured to control the gas supply unit to adjust the gas concentration in the containing chamber according to the detection result of the gas concentration sensor.

10. The pole piece surface treatment device according to any one of claims 1 to 3, characterized in that: Also includes: A deflection correction component is arranged upstream of the electric heating component along the travel direction of the pole piece, and the deflection correction component is used to correct the deflection of the pole piece before it contacts the electric heating component.

11. The pole piece surface treatment device according to any one of claims 1 to 3, characterized in that: The electric heating component further comprises a current regulating module connected to the power supply, and the current regulating module is used to regulate the current of the electric heating circuit.

12. The pole piece surface treatment device according to claim 11, characterized in that: Also includes: a temperature sensor, disposed downstream of the electric heating assembly along the travel direction of the pole piece, the temperature sensor being used to detect the surface temperature of the first area after being treated by the electric heating assembly; as well as The controller is signal-connected to the temperature sensor and the current regulating module respectively, and the controller is configured to control the current regulating module to regulate the current of the electric heating circuit according to the detection result of the temperature sensor.

13. The pole piece surface treatment device according to claim 11, characterized in that: Also includes: A thickness measuring instrument, disposed downstream of the electric heating assembly along the traveling direction of the pole piece, the thickness measuring instrument being used to detect the thickness of the first area after being processed by the electric heating assembly; as well as The controller is signal-connected to the thickness measuring instrument and the current regulating module respectively, and the controller is configured to control the current regulating module to regulate the current of the electric heating circuit according to the detection result of the thickness measuring instrument.

14. A battery production device, characterized in that: A pole piece surface treatment device comprising any one of claims 1-13.

15. A method for processing a pole piece surface, applied to a pole piece surface processing device as claimed in any one of claims 1 to 13, characterized in that: The processing method comprises: conveying a pole piece along a predetermined direction of travel, the pole piece comprising a first region coated with a conductive coating; The first region of the electrode piece is respectively contacted with the first conductive member and the second conductive member of the electric heating component, the first conductive member is used to be connected to the positive electrode of the power supply, the second conductive member is used to be connected to the negative electrode of the power supply, and the first region of the electrode piece located between the first conductive member and the second conductive member forms an electric heating loop with the first conductive member, the second conductive member, and the power supply; The electric heating component is controlled to electrically heat the first area of ​​the pole piece in the electric heating loop.

16. The processing method according to claim 15, characterized in that: Controlling the electric heating component to electrically heat the first area of ​​the electrode piece in the electric heating loop also includes: Acquiring the surface temperature of the first area of ​​the electrode after being processed by the electric heating component; The current of the electric heating circuit is adjusted based on the surface temperature.

17. The processing method according to claim 16, characterized in that: The adjusting the current of the electric heating circuit based on the surface temperature comprises: In response to the surface temperature being less than a first preset temperature threshold, increasing the current of the electric heating circuit; and / or, In response to the surface temperature being greater than a second preset temperature threshold, reducing the current of the electric heating circuit; Wherein, the first preset temperature threshold is lower than the second preset temperature threshold.

18. The processing method according to claim 17, characterized in that: The first preset temperature threshold has a value range of 200°C-220°C; and / or the second preset temperature threshold has a value range of 330°C-350°C.

19. The processing method according to any one of claims 15 to 18, characterized in that: Controlling the electric heating component to electrically heat the first area of ​​the electrode piece in the electric heating loop also includes: Obtaining a first thickness of a first region of the electrode after being processed by the electric heating component; The current of the electric heating circuit is adjusted based on the first thickness.

20. The processing method according to claim 19, characterized in that Adjusting the current of the electric heating loop based on the first thickness includes: Obtaining a second thickness of a first region of the electrode before being processed by the electric heating component; determining an expansion rate of the first region based on the first thickness and the second thickness, the expansion rate being a ratio of a difference between the first thickness and the second thickness to the second thickness; In response to the expansion rate being less than a preset expansion threshold, the current of the electric heating circuit is increased.

21. The processing method according to any one of claims 15 to 18, characterized in that: The electric heating component is arranged in the accommodating cavity of the box body; Before the pole piece is conveyed along the preset direction of travel, the pole piece including the first area coated with the conductive coating, the processing method further comprises: A protective gas is supplied into the containing chamber until a gas concentration of the protective gas in the containing chamber reaches a preset concentration threshold.

22. The processing method according to claim 21, characterized in that: The processing method also includes: obtaining a gas concentration of the protective gas in the containing chamber during the electrical heating process; In response to the gas concentration being lower than a preset concentration threshold, protective gas is added to the containing chamber.

23. The processing method according to any one of claims 15 to 18, characterized in that: Controlling the electric heating component to electrically heat the first area of ​​the electrode piece in the electric heating loop also includes: Controlling the electric heating component to heat the portion of the first area of ​​the electrode piece that is located in the electric heating loop, so that the surface temperature of the portion of the first area of ​​the electrode piece that is located in the electric heating loop rises to a preset temperature range within a preset time period after the electric heating process starts; Wherein, the preset time period is less than or equal to 1s, and the preset temperature range is 200°C-350°C.

Images