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

Abstract

The present application provides a polar plate surface treatment device, a treatment method, and a battery production device, belonging to the technical field of batteries. The polar plate surface treatment device includes a conveying component and an electric heating component. The conveying component is used to convey a polar plate, and the polar plate includes a first region coated with a conductive coating. The electric heating component includes a first conductive member for connecting to the positive electrode of a power source and a second conductive member for connecting to the negative electrode of the power source. Among them, the first conductive member and the second conductive member are arranged at intervals and respectively contact the first region of the polar plate, so that the part of the first region of the polar plate 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 source. By using the electric heating treatment method, burrs on the surface of the polar plate can be quickly removed, the surface treatment efficiency can be improved, and the energy consumption can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a device and method for treating the surface of a pole piece, and a battery production device. Background Art

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

[0003] The pole piece is an important component of the battery cell. During the production process of the pole piece, due to limitations in manufacturing materials, manufacturing equipment, and manufacturing processes, burrs will form on the surface of the pole piece. The burrs may pierce the separator, resulting in a short circuit of the battery cell, increasing the risk of thermal runaway of the battery cell. In some embodiments, the burrs are removed by combustion, but its operation controllability is low, and it is easy to cause poor surface consistency of the pole piece, which is not conducive to maintaining the structural stability of the pole piece and reduces the quality of the pole piece. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the background art. For this reason, an object of the present application is to provide a device and method for treating the surface of a pole piece, and a battery production device, which can improve the structural stability of the pole piece while quickly removing burrs.

[0005] An embodiment of the first aspect of the present application provides a device for treating the surface of a pole piece. The device for treating the surface of a pole piece includes a conveying assembly and an electric heating assembly. The conveying assembly is used to convey the pole piece, and the pole piece includes a first region coated with a conductive coating. The electric heating assembly includes a first conductive member for connecting to the positive electrode of the power supply and a second conductive member for connecting to the negative electrode of the power supply. Wherein, the first conductive member and the second conductive member are arranged at intervals and are respectively in contact with the first region of the pole piece, so that the part of 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.

[0006] In the technical solution of the embodiment of the present application, by heating the part between the first conductive member and the second conductive member by electricity, the energized part can generate high temperature, and the burrs on the surface of the pole piece can be melted at high temperature, thereby realizing the removal of the burrs on the surface of the pole piece. By adopting the energization treatment method, 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 structural stability of the pole piece, and the elastic deformation can be released in advance, 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 traveling direction of the electrode sheet. By arranging the first conductive member and the second conductive member at intervals along the traveling direction of the electrode sheet, the uniformity of the surface treatment of the electrode sheet can be improved, thereby enhancing the quality of the electrode sheet.

[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 traveling direction of the electrode sheet, and both the first sub-conductive member and the second sub-conductive member are 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 traveling direction of the electrode sheet. 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, current can flow into the first sub-conductive member and the second sub-conductive member through the first region along both the traveling direction of the electrode sheet and the opposite direction of the traveling direction of the electrode sheet, which can avoid the phenomenon of leakage on one side of the conductive member caused by only two conductive members being connected to the power supply, improve the current utilization rate of the electrode sheet, and reduce energy consumption.

[0009] In some embodiments, at least one of the first conductive member and the second conductive member includes a first voltage conducting roller; the central axis of the first voltage conducting roller is parallel to the first direction, and the length of the first voltage conducting 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 traveling direction of the electrode sheet and parallel to the surface of the first region. By using the first voltage conducting roller and making the length of the first voltage conducting roller the same as the width of the first region, current can be provided more concentratedly to the first region, improving the current utilization rate; on the other hand, the first voltage conducting roller can roll-press the surface of the electrode sheet by rotating, so that the burrs on the surface of the electrode sheet are smoothed under the action of pressure, which can play an auxiliary role in removing burrs.

[0010] In some embodiments, the electrode sheet includes a plurality of first regions arranged at intervals along the first direction; at least one of the first conductive member and the second conductive member includes a plurality of first voltage conducting rollers; wherein, the plurality of first voltage conducting rollers are arranged corresponding to the plurality of first regions along the first direction, and any first voltage conducting roller is in contact with the corresponding first region. By arranging a plurality of first regions at intervals in the first direction of the electrode sheet, the production efficiency of the electrode sheet can be improved. At the same time, each first region is respectively in contact with the first conductive member and the second conductive member, which can realize independent zone heating for each first region, is beneficial to the precise control of surface treatment, and improves the quality of surface treatment.

[0011] In some embodiments, the electrode sheet includes a plurality of first regions spaced apart in a first direction. At least one of the first conductive member and the second conductive member includes a second conductive pressure roller, and a central axis of the second conductive pressure roller is parallel to the first direction. The second conductive pressure roller includes a plurality of conductive portions spaced apart in the first direction and corresponding to the plurality of first regions, and any one of the conductive portions is in contact with the corresponding first region. Wherein, the first direction is perpendicular to the traveling direction of the electrode sheet and parallel to the surface of the first region. By arranging a plurality of first regions at intervals in the first direction of the electrode sheet, the production efficiency of the electrode sheet can be improved. At the same time, the second conductive pressure roller is utilized and a plurality of conductive portions are arranged at intervals on the second conductive pressure roller, so that a single second conductive pressure roller can simultaneously perform electrothermal treatment on a plurality of first regions, simplifying the structure and improving the convenience of operation.

[0012] In some embodiments, the electrode sheet further includes a second region between two adjacent first regions where no conductive coating is applied. The second conductive pressure roller further includes an insulating film sleeved between two adjacent conductive portions. Wherein, the insulating film is arranged corresponding to the second region, and a length of the insulating film in the first direction is the same as a width of the second region in the first direction. By arranging the insulating film between two adjacent conductive portions and making the insulating film arranged corresponding to the second region, the non-conductive portion and the second region are isolated by the insulating film, reducing the probability that a part between two adjacent conductive portions contacts and conducts electricity with the second region, enabling the current to be concentrated in the first region, and improving the electrothermal efficiency of the first region.

[0013] In some embodiments, the electrode sheet surface treatment device further includes a box body and a gas supply unit. The box body has a receiving cavity, an inlet, and an outlet that allow the electrode sheet to enter and exit the receiving cavity. The gas supply unit is used to supply a protective gas into the receiving cavity. By providing the box body, the interaction between the external gas and the gas in the receiving cavity can be slowed down, so that during the treatment process of the electrode sheet in the receiving cavity of the box body, the oxidation of the electrode sheet can be delayed, and at the same time, the heat loss can be reduced, improving the energy utilization rate.

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

[0015] In some embodiments, the pole piece surface treatment device further includes a deviation rectifying component, which is arranged upstream of the electric heating component along the advancing direction of the pole piece. The deviation rectifying component is used to rectify the pole piece before it comes into contact with the electric heating component. By arranging the deviation rectifying component, the position of the pole piece can be adjusted in real time, so that the pole piece can better contact the first conductive part and the second conductive part, and the quality of the pole piece surface treatment can be improved.

[0016] In some embodiments, the electric heating component further includes a current regulating module connected to a power supply. The current regulating module is used to regulate the current in the electric heating circuit. By arranging the current regulating module, the current in the electric heating circuit can be regulated in real time according to requirements by the current regulating module, so that the pole piece can be in a more appropriate temperature state. On the one hand, the removal of burrs can be realized, and on the other hand, the influence of the high temperature generated by heating on the surface of the pole piece can be reduced.

[0017] In some embodiments, the pole piece surface treatment device further includes a temperature sensor and a controller. The temperature sensor is arranged downstream of the electric heating component along the advancing direction of the pole piece. The temperature sensor is used to detect the surface temperature of the first area after being processed by the electric heating component. The controller is respectively in signal connection with the temperature sensor and the current regulating module. The controller is configured to control the current regulating module to regulate the current in 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 processed by the electric heating component in real time, it is convenient to master the state of the pole piece after being processed by the electric heating treatment, so as to make corresponding adjustments to the pole piece surface treatment process, so that the pole piece is in a suitable temperature range and the quality of the pole piece is improved.

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

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

[0020] An embodiment of the third aspect of the present application provides a method for treating the surface of a pole piece. The treatment method includes: conveying the pole piece along a preset traveling direction, where the pole piece includes a first region coated with a conductive coating; contacting the first region of the pole piece with a first conductive member and a second conductive member of an electric heating assembly respectively, the first conductive member is used to connect to the positive electrode of the power supply, the second conductive member is used to connect to the negative electrode of the power supply, and the part of 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; controlling the electric heating assembly to perform electric heating treatment on the part of the first region of the pole piece in the electric heating circuit. By performing electric heating treatment on the first region 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, so as to remove the burrs on the surface of the pole piece; adopting the electrified treatment method is convenient to operate. On the one hand, it can 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 beneficial to maintaining the stability of the pole piece structure, and releasing elastic deformation in advance, improving the quality of the pole piece.

[0021] In some embodiments, controlling the electric heating assembly to perform electric heating treatment on the part of the first region of the pole piece in the electric heating circuit further includes: obtaining the surface temperature of the first region of the pole piece after being processed by the electric heating assembly; 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 processed by the electric heating assembly in real time, it is convenient to master the state of the pole piece after electric heating treatment, so as to perform corresponding adjustments on the surface treatment process of the pole piece, so that the pole piece is in a suitable temperature range and improves the quality of the pole piece.

[0022] In some embodiments, adjusting the current of the electric heating circuit based on the surface temperature includes: in response to the surface temperature being less than the first preset temperature threshold, increasing the current of the electric heating circuit; and / or, in response to the surface temperature being greater than the second preset temperature threshold, decreasing the current of the electric heating circuit; where the first preset temperature threshold is less than the second preset temperature threshold. By obtaining the surface temperature of the first region processed by the electric heating assembly and adjusting the current of the electric heating circuit according to the temperature feedback, the pole piece is in a suitable temperature range and the quality of the pole piece is improved.

[0023] In some embodiments, the value range of the first preset temperature threshold is 200°C - 220°C; and / or the value range of the second preset temperature threshold is 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, and the pole piece structure deformation can be avoided as much as possible, improving the quality of the pole piece.

[0024] In some embodiments, controlling the electrothermal component to perform electrothermal treatment on a first region of the electrode sheet that is part of the electrothermal circuit further includes: obtaining a first thickness of the first region of the electrode sheet after being processed by the electrothermal component; adjusting the current of the electrothermal circuit based on the first thickness. By using a thickness measuring instrument to detect the thickness of the electrode sheet after being processed by the electrothermal component in real time, it is convenient to grasp the state of the electrode sheet after electrothermal treatment, so as to make corresponding adjustments to the surface treatment process of the electrode sheet, so that the electrode sheet is in a suitable temperature range, which is beneficial to releasing the elastic deformation of the electrode sheet.

[0025] In some embodiments, adjusting the current of the electrothermal circuit based on the first thickness includes: obtaining a second thickness of the first region of the electrode sheet before being processed by the electrothermal component; determining the expansion rate of the first region based on the first thickness and the second thickness, where the expansion rate is the ratio of the 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, increasing the current of the electrothermal circuit. By controlling the expansion rate of the first region within the preset expansion threshold range, the elastic deformation of the electrode sheet is fully released, which is beneficial to improving the quality of the electrode sheet.

[0026] In some embodiments, the electrothermal component is disposed in the accommodation cavity of the box body; before the electrode sheet is conveyed along a preset traveling direction and the electrode sheet includes a first region coated with a conductive coating, the processing method further includes: supplying a protective gas into the accommodation cavity until the gas concentration of the protective gas in the accommodation cavity reaches a preset concentration threshold. By supplying the protective gas to the accommodation cavity in advance, the electrode sheet can be electrothermally treated in an environment of the protective gas, which can reduce the probability of oxidation of the electrode sheet during electrothermal treatment.

[0027] In some embodiments, the processing method further includes: obtaining the gas concentration of the protective gas in the accommodation cavity during electrothermal treatment; in response to the gas concentration being lower than the preset concentration threshold, replenishing the protective gas into the accommodation cavity. By detecting the gas concentration of the protective gas in the accommodation cavity in real time during electrothermal treatment and supplying the protective gas according to the demand, the electrode sheet can be continuously electrothermally treated in an environment of the protective gas, which can reduce the probability of oxidation of the electrode sheet during electrothermal treatment and improve the quality of the electrode sheet.

[0028] In some embodiments, controlling the electro - heating component to perform electro - heating treatment on the part of the first area of the electrode sheet in the electro - heating circuit further includes: controlling the electro - heating component to heat the part of the first area of the electrode sheet in the electro - heating circuit, so that the surface temperature of the part of the first area of the electrode sheet in the electro - heating circuit rises to a preset temperature range within a preset time period after the start of the electro - heating treatment; wherein, the preset time period is less than or equal to 1 s, 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 and 350°C within 1 s, on the one hand, the efficiency of deburring is improved, and on the other hand, the influence time of high temperature on the surface of the electrode sheet is minimized as much as possible to protect the structure of the electrode sheet.

[0029] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specific embodiments of this application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with this application and should not be regarded as limiting the scope of this application.

[0031] Figure 1 Schematic structural diagram of an electrode sheet surface treatment device provided by an embodiment of this application;

[0032] Figure 2 Schematic diagram of an electrode sheet in contact with two first conductive pressure rollers provided by an embodiment of this application;

[0033] Figure 3 Another schematic structural diagram of an electrode sheet surface treatment device provided by an embodiment of this application;

[0034] Figure 4 Schematic diagram of the first area on an electrode sheet in contact with three first conductive pressure rollers respectively provided by an embodiment of this application;

[0035] Figure 5 Schematic diagram of an electrode sheet in contact with three second conductive pressure rollers provided by an embodiment of this application;

[0036] Figure 6 Schematic flow chart of a method for treating the surface of an electrode sheet provided by an embodiment of this application;

[0037] Figure 7 Another schematic flow chart of a method for treating the surface of an electrode sheet provided by an embodiment of this application.

[0038] Description of Reference Numerals of the Drawings:

[0039] 100, pole piece surface treatment device; 110, conveying assembly; 111, insulating driving 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 voltage-conducting roller; 124, second voltage-conducting roller; 1241, conducting portion; 1242, insulating film; 130, box body; 131, inlet; 132, outlet; 133, accommodating cavity; 140, gas concentration sensor; 150, deviation rectifying assembly; 160, temperature sensor; 170, thickness measuring instrument; 200, pole piece; 210, first region; 220, second region; 300, treatment method. Detailed Embodiments

[0040] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality" means more than two unless otherwise specifically defined.

[0043] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, both A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0045] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0046] In the description of the embodiments of the present application, for technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific circumstances.

[0048] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more widespread. 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 transportation means such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also constantly increasing.

[0049] The electrode sheet is an important component of a battery cell. During the manufacturing process of the battery cell, the electrode sheet needs to be processed by slitting, die-cutting, winding, or laminating, etc., so that the electrode sheet can finally be assembled into a complete battery cell. However, during the production process of the electrode sheet, due to limitations in manufacturing materials, manufacturing equipment, and manufacturing processes, burrs may form on the surface of the electrode sheet. When laminating the battery cell, the separator is easily pierced by the burrs on the surface of the electrode sheet, resulting in a short circuit of the battery cell and increasing the risk of thermal runaway of the battery cell.

[0050] In some embodiments, by using a hot roller to roll-press the surface of the electrode sheet, the burrs on the surface of the electrode sheet are smoothed under the action of pressure. In some embodiments, by blowing hot air over the surface of the electrode sheet, the hot air is used to melt the burrs on the surface of the electrode sheet. The maximum temperature that can be achieved by the treatment methods of the hot roller and hot air is limited, and the time required to reach the maximum temperature is relatively long, resulting in low efficiency of the electrode sheet surface treatment.

[0051] In some embodiments, by introducing a combustible gas into the space containing the electrode sheet and igniting the combustible gas, a flame is formed in the containing space. The flame has an instantaneous high temperature, and the high temperature generated by the flame acts on the surface of the electrode sheet to remove the burrs on the surface of the electrode sheet. The controllability of the combustion method is relatively low, and the surface of the electrode sheet may be unevenly heated, resulting in poor surface uniformity of the electrode sheet, which is not conducive to maintaining the structural stability of the electrode sheet, and the energy consumption is relatively high.

[0052] To solve the above problems, the present application provides an electrode sheet surface treatment device, a treatment method, and a battery production device. The electrode sheet surface treatment device includes a conveying component and an electric heating component. The conveying component is used to convey the electrode sheet, and the electrode sheet includes a first region coated with a conductive coating; the electric heating component includes a first conductive member for connecting to the positive electrode of the power supply and a second conductive member for connecting to the negative electrode of the power supply; wherein, the first conductive member and the second conductive member are arranged at intervals and are respectively in contact with the first region of the electrode sheet, so that the part of the first region of the electrode sheet 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. By using the electric heating component to electrically heat a part of the first region, on the one hand, the temperature of the electrode sheet can be quickly increased, which helps to improve the efficiency of burr removal; on the other hand, the uniformity of the surface temperature of the electrode sheet can be improved, which is beneficial to maintaining the structural stability of the electrode sheet, and the elastic deformation can be released in advance, improving the quality of the electrode sheet.

[0053] The electrode sheet surface treatment device and treatment method provided by the embodiments of the present application can be used, but are not limited to, the treatment of burrs on the surface of electrode sheets in prismatic battery cells, the treatment of burrs on the surface of electrode sheets in soft-pack battery cells, and the treatment of burrs on the surface of electrode sheets in cylindrical battery cells.

[0054] The battery production equipment provided by the embodiments of the present application uses battery monomers obtained by processing with a pole piece surface treatment device. The battery monomers can be used in electrical equipment, and the electrical equipment can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, and so on. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc. It can also be, but is not limited to, applied to energy storage systems or energy systems combined with energy storage or energy conversion devices such as storage batteries (such as lithium batteries) and fuel cells (such as hydrogen energy batteries).

[0055] As Figure 1 and Figure 2 shown Figure 1 is a schematic structural diagram of a pole piece surface treatment device provided by the embodiments of the present application; Figure 2 is a schematic diagram of a pole piece in contact with two first voltage-conducting rollers provided by the embodiments of the present application.

[0056] The embodiments of the present application provide a pole piece surface treatment device 100. The pole piece surface treatment device 100 includes a conveying assembly 110 and an electric heating assembly 120. The conveying assembly 110 is used to convey a pole piece 200, and the pole piece 200 includes a first region 210 coated with a conductive coating. The electric heating assembly 120 includes a first conductive member 121 for connecting to the positive electrode of a power source and a second conductive member 122 for connecting to the negative electrode of the power source. Among them, the first conductive member 121 and the second conductive member 122 are arranged at intervals and are respectively in contact with the first region 210 of the pole piece 200, so that the part of the first region 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 source.

[0057] The pole piece 200 is the part in the battery monomer for storing and releasing electric energy, and its structure includes a current collector and a conductive coating. The current collector is the supporting framework of the pole piece 200 and plays a role in carrying and transmitting current. For the positive current collector, its material is, for example, aluminum foil; for the negative 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 current collector, the active substances are, for example, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, and so on; for the conductive coating on the negative current collector, the active substances are, for example, graphite, silicon-based materials, and so on.

[0058] The area on the current collector of the electrode sheet 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 current collector corresponding to 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 on the outer periphery of the first area 210.

[0059] The conveying assembly 110 is a device for conveying the electrode sheet 200 to the electric heating assembly 120 for burr removal and conveying the electrode sheet 200 after burr removal to the next process. The conveying assembly 110 can be any feasible power component, and its conveying can be continuous conveying and intermittent conveying. Continuous conveying means burr removal is carried out during the conveying process; intermittent conveying means burr removal is carried out in a stationary state, and after the burrs in this area are removed, it is conveyed to the next process.

[0060] In some embodiments, the conveying assembly 110 can be a continuously conveying driving roller, and the driving roller contacts the electrode sheet 200, and the rotation of the driving roller drives the movement of the electrode sheet 200. In some embodiments, the conveying assembly 110 can be a continuously conveying driving chain, and the driving chain is connected to the edge of the electrode sheet 200, and the rotation of the driving chain drives the movement of the electrode sheet 200; the transmission speed of the conveying assembly 110, for example, is 5 m / min (5 meters per minute), 10 m / min, etc. The embodiments of the present application do not limit the specific structure and transmission speed.

[0061] The electric heating assembly 120 is a device for energizing the first area 210 of the electrode sheet 200 so that the first area 210 can generate heat. It specifically includes a first conductive member 121 and a second conductive member 122 arranged at intervals. The first conductive member 121 and the second conductive member 122 can be any feasible conductive components, for example, metal conductive blocks, metal conductive brushes, metal conductive rollers, etc. The first conductive member 121 and the second conductive member 122 can be conductive components of the same structural type or different structural types. The interval arrangement includes the interval arrangement in the conveying direction and the interval arrangement in the non-conveying direction. The embodiments of the present application do not limit the specific structure and layout method, as long as the requirements that the first conductive member 121 and the second conductive member 122 are respectively in contact with the first area 210 of the electrode sheet 200 are met.

[0062] 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 part 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.

[0063] The current passes through the current collector and the conductive coating of the electrode sheet 200. Due to the resistance, heat is generated in both the current collector and the conductive coating. Exemplarily, the resistance of the conductive coating is R 1 , the current passing through the conductive coating is I 1 , and the electrothermal power generated by the conductive coating is P 1 =I 1 2 R 1 . From this, it can be seen that the greater the current, the greater the electrothermal power P 1 . According to the thermodynamic formula, P 1 t = c 1 m 1 ΔT 1 , where t represents time, c 1 represents specific heat capacity, m 1 represents mass, and ΔT 1 represents the temperature change. It can be seen that the greater the thermal power P 1 , the greater the temperature change ΔT per unit time 1 , and the higher the generated temperature. The burrs on the surface of the electrode sheet will melt at high temperatures. The temperature rises to between 200°C and 350°C, for example. At the same time, under the action of the current, the material molecules of the conductive coating will be affected by the Coulomb force and the Lorentz force, and the material molecular layers will repel each other, causing the conductive coating to expand. According to the expansion theory, Δδ = α×δ×ΔT 1 , where α represents the expansion coefficient, δ represents the original size, and ΔT 1 represents the temperature change. It can be seen that the greater the temperature change ΔT 1 , the more obvious the thickness change Δδ of the conductive coating. Similarly, the current collector will also expand under the action of the current. Due to the material, the degree of its expansion change is less than that of the conductive coating. The expansion of the electrode sheet 200 can release elastic deformation and relieve internal stress, making the electrode sheet 200 more stable during the subsequent processing of assembling into a battery cell.

[0064] In some embodiments, the electrode sheet surface treatment device 100 can be equipped with a built-in power supply device and does not need to rely on external power supply. The built-in power supply device is used for electrothermal treatment. In some embodiments, the electrode sheet surface treatment device 100 does not have a power supply device, and external power is used to supply electrical energy to the electrothermal component 120 for electrothermal treatment.

[0065] In some embodiments, the electrothermal component 120 can be configured to be able to raise the surface temperature of the first region 210 of the electrode sheet 200 in the electrothermal circuit to between 200°C and 350°C within 1 s, that is, greater than or equal to 200°C and less than or equal to 350°C.

[0066] By applying electric current to heat the part between the first conductive member 121 and the second conductive member 122, the energized part can generate high temperature, and the burrs on the surface of the electrode plate can be melted at high temperature, thereby removing the burrs on the surface of the electrode plate. By using the electric current application method, on the one hand, the temperature of the electrode plate 200 can be quickly increased, which helps to improve the efficiency of burr removal; on the other hand, the uniformity of the surface temperature of the electrode plate can be improved, which is beneficial to maintaining the stability of the structure of the electrode plate 200, and releasing elastic deformation in advance, thereby improving the quality of the electrode plate 200.

[0067] According to some embodiments of the present application, as Figure 2 shown, the first conductive member 121 and the second conductive member 122 are arranged at intervals along the traveling direction of the electrode plate 200.

[0068] The first conductive member 121 and the second conductive member 122 are conductive components used to contact the first region 210. The first conductive member 121 is connected to the positive electrode of the power supply, and the second conductive member 122 is connected to the negative electrode of the power supply. The current flows out from the first conductive member 121, passes through the first region 210, and flows into the second conductive member 122.

[0069] The first conductive member 121 and the second conductive member 122 are arranged at intervals along the traveling direction of the electrode plate 200. The traveling direction is as Figure 2 shown by the arrow direction in the figure. The interval between the first conductive member 121 and the second conductive member 122 is, for example, 0.5 meters, 1 meter, and so on.

[0070] In some embodiments, the length of the contact between the first conductive member 121 and the second conductive member 122 and the electrode plate 200 in the first direction is greater than the width of the first region 210 in the first direction; in some embodiments, the length of the contact between the first conductive member 121 and the second conductive member 122 and the electrode plate 200 in the first direction is less than the width of the first region 210 in the first direction. The first direction is perpendicular to the traveling direction of the electrode plate 200 and parallel to the surface of the first region 210.

[0071] In some embodiments, the first conductive member 121 is arranged upstream of the second conductive member 122, and the electrode plate 200 first passes through the first conductive member 121 and then through the second conductive member 122; in some embodiments, the second conductive member 122 is arranged upstream of the first conductive member 121, and the electrode plate 200 first passes through the second conductive member 122 and then through the first conductive member 121. The embodiments of the present application do not limit this arrangement method and the interval distance.

[0072] By arranging the first conductive member 121 and the second conductive member 122 at intervals along the traveling direction of the electrode plate 200, the uniformity of the surface treatment of the electrode plate can be improved, thereby improving the quality of the electrode plate 200.

[0073] As Figure 3 and Figure 4As shown, Figure 3 is a schematic structural diagram of another electrode sheet surface treatment device provided by an embodiment of the present application; Figure 4 is a schematic diagram showing that the first region on the electrode sheet in an embodiment of the present application is in contact with three first conductive pressure rollers respectively.

[0074] 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 arranged at intervals along the traveling direction of the electrode sheet 200, and both the first sub-conductive member 1221 and the second sub-conductive member 1222 are connected to the negative electrode 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 traveling direction of the electrode sheet 200.

[0075] 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. The two can be conductive components of the same structural type or different structural types.

[0076] The first conductive member 121 is connected to the positive electrode of the power supply, both the first sub-conductive member 1221 and the second sub-conductive member 1222 are 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 traveling direction of the electrode sheet 200. Current flows out from the first conductive member 121 and flows into the first sub-conductive member 1221 and the second sub-conductive member 1222 respectively through the first region 210 along the traveling direction of the electrode sheet 200 and the opposite direction of the traveling direction to form two groups of electric heating circuits.

[0077] In some embodiments, the first conductive member 121 is located in the middle of 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 less 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 greater than the distance from the first conductive member 121 to the second sub-conductive member 1222. The embodiments of the present application do not limit this arrangement.

[0078] By connecting the first conductive member 121 to the positive electrode of the power supply and arranging it between the first sub-conductive member 1221 and the second sub-conductive member 1222, it enables current to flow into the first sub-conductive member 1221 and the second sub-conductive member 1222 through the first region 210 along both the traveling direction of the electrode sheet 200 and the opposite direction of the traveling direction of the electrode sheet 200, which can avoid the phenomenon of electric leakage on one side of the conductive member caused by only two conductive members being connected to the power supply, improve the current utilization rate of the electrode sheet 200 and reduce energy consumption.

[0079] According to some embodiments of the present application, as Figure 3 Figure 4 shown, at least one of the first conductive member 121 and the second conductive member 122 includes a first conductive pressure roller 123; the central axis of the first conductive pressure roller 123 is parallel to the first direction, and the length of the first conductive pressure roller 123 in the first direction is the same as the width of the first region 210 in the first direction; wherein, the first direction is perpendicular to the traveling direction of the pole piece 200 and parallel to the surface of the first region 210.

[0080] The first conductive pressure roller 123 is a conductive component for contacting the first region 210 and capable of rolling as the pole piece 200 moves. The first conductive pressure roller 123 has a cylindrical structure, its central axis is parallel to the first direction, the first direction is perpendicular to the traveling direction of the pole piece 200 and parallel to the surface of the first region 210, and current is transmitted through the contact between the outer surface of the first conductive pressure roller 123 and the first region 210.

[0081] In some embodiments, the length of the first conductive pressure roller 123 in the first direction is the same as the width of the first region 210 in the first direction.

[0082] In some embodiments, the first conductive pressure roller 123 has a power source, the first conductive pressure roller 123 can rotate by itself under the action of its own power source, and can assist in conveying the pole piece 200. In some embodiments, the first conductive pressure roller 123 does not have a power source, and the first conductive pressure roller 123 rotates based on the friction with the pole piece 200 driven by the traveling of the pole piece 200. The first conductive pressure roller 123 contacts the pole piece 200 in a rolling friction manner, which can reduce the frictional resistance, thereby being beneficial to maintaining the stability of the pole piece structure.

[0083] In some embodiments, the first conductive member 121 includes a first conductive pressure roller 123, and the second conductive member 122 includes a metal conductive brush. The metal conductive brush can be in contact with the first region 210 of the electrode sheet 200 to achieve electrical connection. It can be understood that the metal conductive brush can be in abutment with the electrode sheet 200 by means of elastic bending 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 pressure roller 123. The metal conductive block can be a metal of any block structure. The metal conductive block can be rigidly fixed and directly in abutment with the first region 210 of the electrode sheet 200 to achieve electrical connection between the two. In some embodiments, both the first conductive member 121 and the second conductive member 122 include a first conductive pressure roller 123. The conveying assembly 110 includes an insulating driving roller 111. The insulating driving roller 111 corresponds to the first conductive pressure roller 123 one by one. The electrode sheet 200 is located between the insulating driving roller 111 and the first conductive pressure roller 123. The insulating driving roller 111 provides a supporting force to increase the friction between the first conductive pressure roller 123 and the electrode sheet 200. Exemplarily, the insulating driving roller 111 has a power source, and the insulating driving roller 111 can rotate on its own under the action of its own power source. Exemplarily, the insulating driving roller 111 does not have a power source, and under the drive of the advancing of the electrode sheet 200, the insulating driving roller 111 rotates based on the friction with the electrode sheet 200.

[0084] By adopting the first conductive pressure roller 123 and making the length of the first conductive pressure roller 123 the same as the width of the first region 210, current can be provided more concentratedly to the first region 210, improving the current utilization rate and the current utilization rate of the electrode sheet 200. On the other hand, the first conductive pressure roller 123 can roll-press the surface of the electrode sheet 200 by rotating, so that the burrs on the surface of the electrode sheet are smoothed under the action of pressure, which can play a role in assisting in removing burrs.

[0085] According to some embodiments of the present application, as Figure 3 Figure 4 shown, the electrode sheet 200 includes a plurality of first regions 210 arranged at intervals in the first direction; at least one of the first conductive member 121 and the second conductive member 122 includes a plurality of first conductive pressure rollers 123; wherein, the plurality of first conductive pressure rollers 123 are arranged corresponding to the plurality of first regions 210 in the first direction, and any first conductive pressure roller 123 is in contact with the corresponding first region 210.

[0086] The electrode sheet 200 is provided with a plurality of first regions 210 at intervals in the first direction, for example, two first regions 210, three first regions 210, etc. are arranged at intervals. The plurality of first regions 210 can be coated with the same active material or different active materials. The present application embodiments do not limit this arrangement manner and material.

[0087] In some embodiments, both the first conductive member 121 and the second conductive member 122 include a plurality of first conductive pressure rollers 123; in some embodiments, either the first conductive member 121 or the second conductive member 122 includes a plurality of first conductive pressure rollers 123.

[0088] In some embodiments, the width of the electrode sheet 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 arranged at intervals in the first direction of the electrode sheet 200, the distance between adjacent two first regions 210 is 0.2 meters, and the distance from each first region 210 to the side of the electrode sheet 200 is 0.1 meter.

[0089] Exemplarily, the first conductive member 121 includes two first conductive pressure rollers 123, and the second conductive member 122 includes two first conductive pressure rollers 123, that is, each first region 210 respectively contacts two first conductive pressure rollers 123, and in each first region 210, one first conductive pressure roller 123 is connected to the positive electrode of the power supply, and the other is connected to the negative electrode of the power supply.

[0090] Exemplarily, the first conductive member 121 includes two first conductive pressure rollers 123, the second conductive member 122 includes a first sub-conductive member 1221 and a second sub-conductive member 1222, and the first sub-conductive member 1221 and the second sub-conductive member 1222 each include two first conductive pressure rollers 123, that is, each first region 210 respectively contacts three first conductive pressure rollers 123, the first conductive pressure roller 123 located in the middle along the traveling direction is connected to the positive electrode of the power supply, and the other two are respectively connected to the negative electrode of the power supply.

[0091] By arranging a plurality of first regions 210 at intervals in the first direction of the electrode sheet 200, the production efficiency of the electrode sheet 200 can be improved. At the same time, each first region 210 respectively contacts the first conductive member 121 and the second conductive member 122, so that independent zone heating of each first region 210 can be realized, which is beneficial to the precise control of surface treatment and improves the quality of surface treatment.

[0092] As Figure 5 shown, Figure 5 is a schematic diagram of the electrode sheet provided by the embodiment of the present application in contact with three second conductive pressure rollers.

[0093] According to some embodiments of the present application, the electrode sheet 200 includes a plurality of first regions 210 spaced apart in a first direction. At least one of the first conductive member 121 and the second conductive member 122 includes a second voltage-conducting roller 124, and the central axis of the second voltage-conducting roller 124 is parallel to the first direction; the second voltage-conducting roller 124 includes a plurality of conductive portions 1241 spaced apart in the first direction and correspondingly arranged with the plurality of first regions 210, and any one of the conductive portions 1241 is in contact with the corresponding first region 210; wherein, the first direction is perpendicular to the traveling direction of the electrode sheet 200 and parallel to the surface of the first region 210.

[0094] The electrode sheet 200 is provided with a plurality of first regions 210 spaced apart in the first direction. For example, two first regions 210, three first regions 210, etc. are spaced apart. The plurality of first regions 210 may be coated with the same active material or different active materials. The embodiments of the present application do not limit this arrangement and material.

[0095] The second voltage-conducting roller 124 is a through roller extending in the width direction of the electrode sheet 200, and the length of the second voltage-conducting roller 124 may be equal to the width of the electrode sheet 200. In some embodiments, both the first conductive member 121 and the second conductive member 122 include the second voltage-conducting roller 124; in some embodiments, either the first conductive member 121 or the second conductive member 122 includes the second voltage-conducting roller 124.

[0096] The second voltage-conducting roller 124 is a conductive component for contacting the first region 210 and capable of rolling as the electrode sheet 200 moves. It includes a plurality of conductive portions 1241 spaced apart in the first direction, and the number of the conductive portions 1241 corresponds to the number of the first regions 210. It can be understood that the corresponding here can include one-to-one, that is, each conductive portion 1241 corresponds to and contacts one first region 210, or can include one-to-many, that is, one conductive portion 1241 corresponds to a plurality of first regions 210. The central axis of the second voltage-conducting roller 124 is parallel to the first direction, and the first direction is perpendicular to the traveling direction of the electrode sheet 200 and parallel to the surface of the first region 210. The current is transmitted through the contact between the outer surface of the conductive portion 1241 of the second voltage-conducting roller 124 and the first region 210.

[0097] In some embodiments, a non-conductive portion is provided between two adjacent conductive portions 1241. The second voltage-conducting roller 124 is at least partially a cylindrical structure, and the radius dimension of the cross-section of the conductive portion 1241 perpendicular to the central axis is larger than the radius dimension 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 region 210, the non-conductive portion is spaced apart from the second region 220 between two adjacent first regions 210 by a certain distance.

[0098] 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, two first regions 210 are arranged at intervals in the first direction of the pole piece 200, the distance between two adjacent first regions 210 is 0.2 meters, and the distance from each first region 210 to the side of the pole piece 200 is 0.1 meter. The first conductive member 121 includes a second conductive pressure roller 124, the second conductive member 122 includes two second conductive pressure rollers 124, the second conductive pressure roller 124 includes two conductive parts 1241 arranged at intervals, the length of the conductive part 1241 in the first direction is 0.5 meters, the distance between two adjacent conductive parts 1241 is 0.2 meters, and the conductive parts 1241 correspond to the first regions 210 one by one.

[0099] By arranging a plurality of 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 pressure roller 124 is utilized and a plurality of conductive parts 1241 are arranged at intervals on the second conductive pressure roller 124, so that a single second conductive pressure roller 124 can simultaneously perform electrothermal treatment on a plurality of first regions 210, simplifying the structure and improving the convenience of operation.

[0100] According to some embodiments of the present application, as Figure 2 and Figure 4 shown, the pole piece 200 further includes a second region 220 without a conductive coating between two adjacent first regions 210, and the second conductive pressure roller 124 further includes an insulating film 1242 sleeved between two adjacent conductive parts 1241; wherein, the insulating film 1242 is correspondingly arranged with the second region 220, and the length of the insulating film 1242 in the first direction is the same as the width of the second region 220 in the first direction.

[0101] The region on the current collector of the pole piece 200 coated with a conductive coating is the first region 210, and the region between two adjacent first regions 210 without a conductive coating is the second region 220.

[0102] The second conductive pressure roller 124 is of a cylindrical structure, with a plurality of conductive parts 1241 arranged at intervals in the first direction, and the non-conductive part between two adjacent conductive parts 1241 refers to the part that will not be conductively connected to the pole piece 200. It can be understood that the non-conductive part can be realized by sleeving an insulating film 1242 on the roller surface to achieve non-conductive contact with the pole piece 200.

[0103] The insulating film 1242 is a thin film material with high resistivity used to prevent current from passing through, such as a polyimide film, a silicon dioxide film, etc. The embodiments of the present application do not limit this material. The insulating film 1242 is sleeved on the non-conductive part between two adjacent conductive parts 1241, and is used to isolate the non-conductive part from the second region 220, reducing the probability of conduction when the non-conductive part contacts the second region 220.

[0104] In some embodiments, two first regions 210 are arranged at intervals in the first direction on the pole piece 200, 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, the distance between two adjacent conductive parts 1241 on the second voltage-conducting 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 in the first direction is 0.2 meters, which is correspondingly arranged with the second region 220.

[0105] By arranging the insulating film 1242 between two adjacent conductive parts 1241 and making the insulating film 1242 correspondingly arranged with the second region 220, the non-conductive part and the second region 220 are isolated by the insulating film 1242, reducing the probability of conduction when the part between two adjacent conductive parts 1241 contacts the second region 220, making the current concentrate on the first region 210, and improving the efficiency of electric heating in the first region 210.

[0106] According to some embodiments of the present application, as Figure 1 and Figure 3 shown, the pole piece surface treatment device 100 further includes a box body 130 and a gas supply unit. The box body 130 has a receiving cavity 133 and an inlet 131 and an outlet 132 that allow the pole piece 200 to enter and exit the receiving cavity; the gas supply unit is used to supply a protective gas into the receiving cavity 133.

[0107] The box body 130 is a device or structure for accommodating the electric heating component 120, enabling the electric heating component 120 to perform electric heating treatment on the pole piece 200 in the receiving cavity 133 of the box body 130, such as a cube, a cylinder, a cuboid, etc. The embodiments of the present application do not limit this structure.

[0108] The box body 130 includes an inlet 131, an outlet 132 and a receiving cavity 133. The pole piece 200 enters the receiving cavity 133 from the inlet 131, and the electric heating component 120 in the receiving cavity 133 performs electric heating treatment on the pole piece 200. Subsequently, the pole piece 200 leaves the receiving cavity 133 from the outlet 132.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] The controller is respectively connected to the gas concentration sensor 140 and the gas supply unit in a signal connection manner. The gas concentration of the protective gas collected by the gas concentration sensor 140 can be sent to the controller through signal transmission, and the controller sends corresponding control and adjustment information to the gas supply unit through 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; it can also be a wireless connection, that is, the signal is transmitted through a wireless network.

[0117] The controller can process the gas concentration collected by the gas concentration sensor 140. For example, the gas concentration is compared with a preset protective gas concentration, and corresponding operation information is output according to preset conditions. The controller can be a microcontroller (MCU) or a digital signal processor (DSP), etc.

[0118] In some embodiments, the preset threshold of the concentration of the protective gas is 99%. The gas concentration sensor 140 collects the gas concentration in the accommodation chamber 133 and transmits it to the controller. The controller determines that the detected gas concentration is less than the preset concentration threshold. The controller sends a gas supply signal to the gas supply unit based on the detection result, and the gas supply unit supplies the protective gas into the accommodation chamber 133 to increase the concentration of the protective gas in the accommodation chamber 133.

[0119] In some embodiments, the preset threshold of the concentration of the protective gas is 99%. The gas concentration sensor 140 collects the gas concentration in the accommodation 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. The controller does not need to send a gas supply signal to the gas supply unit based on the detection result, or sends a standby signal to the gas supply unit, and does not supply the protective gas into the accommodation chamber 133.

[0120] It should be noted that the gas supply unit can supply the protective gas before the electrothermal treatment or during the electrothermal treatment.

[0121] By setting the gas concentration sensor 140 and the controller, the gas concentration sensor 140 is used to collect the gas concentration in the accommodation chamber 133 in real time, so as to adjust the gas concentration in the accommodation chamber 133 in real time according to the demand, and reduce the probability of oxidation of the electrode sheet 200 during the electrothermal treatment.

[0122] According to some embodiments of the present application, as Figure 1 and Figure 3 shown, the electrode sheet surface treatment device 100 further includes a deviation rectifying assembly 150. The deviation rectifying assembly 150 is arranged upstream of the electrothermal assembly 120 along the traveling direction of the electrode sheet 200. The deviation rectifying assembly 150 is used to rectify the electrode sheet 200 before it contacts the electrothermal assembly 120.

[0123] The deviation correction component 150 is a device for detecting the position of the electrode sheet 200 and capable of adjusting the position of the electrode sheet 200. For example, a deviation correction roller, a manipulator, etc. The specific structure is not limited in the embodiments of the present application.

[0124] In some embodiments, the deviation correction component 150 includes a deviation correction sensor and a deviation correction execution unit. Along the traveling direction of the electrode sheet 200, the deviation correction sensor is arranged upstream of the deviation correction execution unit, and the deviation correction execution unit is arranged upstream of the electric heating component 120. The position of the electrode sheet 200 is detected by the deviation correction sensor. When it is detected that the electrode sheet 200 deviates along its own width direction, the deviation correction sensor transmits a signal to the controller, and the controller controls the deviation correction execution unit to adjust the position of the electrode sheet 200, so that the electrode sheet 200 can smoothly pass through the electric heating component 120 during the process.

[0125] Among them, the deviation correction sensor can be but is not limited to being set as an infrared sensor, and the deviation correction execution unit can be but is not limited to being set as a deviation correction roller. The position of the electrode sheet 200 along its own width direction is detected by the infrared sensor, and then based on the detection result, the deviation correction roller is controlled to drive the electrode sheet 200 thereon to move along the width direction, so as to adjust the position of the electrode sheet 200 in the width direction.

[0126] By setting the deviation correction component 150, the position of the electrode sheet 200 can be adjusted in real time, so that the electrode sheet 200 can better contact the first conductive member 121 and the second conductive member 122, and the quality of the surface treatment of the electrode sheet is improved.

[0127] According to some embodiments of the present application, the electric heating component 120 further includes a current adjustment module connected to the power supply, and the current adjustment module is used to adjust the current of the electric heating circuit.

[0128] The current adjustment module can be a unit module connected to the electric heating circuit, or a control unit module directly acting on the power supply, such as a unit module integrated in a power management system or a power controller. The current adjustment module is an electronic device for adjusting and controlling the current in the circuit, such as a bipolar transistor current adjustment module, a field effect transistor current adjustment module, etc. The specific type is not limited in the embodiments of the present application.

[0129] In some embodiments, the current adjustment module is a bipolar transistor current adjustment module. The bipolar transistor mainly adjusts the collector current and the emitter current by controlling the base current. A positive 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 into the base, and the base current increases, and then the collector current also increases; conversely, when the base voltage decreases, the base current decreases, and the collector current also decreases accordingly.

[0130] In some embodiments, the current regulation module is a field-effect transistor current regulation module. A 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, it will change the charge concentration and distribution in the channel, thereby affecting the resistance of the channel and controlling the magnitude of the drain current.

[0131] It should be noted that as any kind of regulation module, the current regulation module can receive the control instruction of the controller to adjust the magnitude of the current.

[0132] In some embodiments, the current regulation module can be integrated into the first conductive member 121 or the second conductive member 122; in some embodiments, the current regulation module can be used as an independent component and electrically connected to the first conductive member 121 or the second conductive member 122.

[0133] In some embodiments, the resistance R of the conductive coating 1 , the current I passing through the conductive coating 1 , according to the electrothermal power P 1 =I 1 2 R 1 it can be seen that the greater the current, the greater the electrothermal power P 1 . According to the thermodynamic formula, P 1 t = c 1 m 1 ΔT 1 it can be seen that the greater the thermal power P 1 , the greater the temperature change ΔT per unit time 1 . The greater ΔT 1 , the greater the temperature change per unit time, that is, the faster the heating rate; at the same time, the greater the temperature change also indicates that the maximum temperature that can be reached is high. Therefore, the current regulation module can be used to increase the current in the electric heating circuit to increase the heating rate and the maximum temperature that can be reached.

[0134] By setting the current regulation module and using the current regulation module to adjust the current in the electric heating circuit in real time according to the demand, the electrode sheet 200 can be in a more appropriate temperature state. On the one hand, it can achieve the removal of burrs, and on the other hand, it can reduce the influence of the high temperature generated by heating on the surface of the electrode sheet 200.

[0135] According to some embodiments of the present application, such as Figure 1 and Figure 3As shown, the electrode sheet surface treatment device 100 further includes a temperature sensor 160 and a controller. The temperature sensor 160 is disposed downstream of the electric heating component 120 along the traveling direction of the electrode sheet 200, and is configured to detect the surface temperature of the first region 210 after being processed by the electric heating component 120. The controller is in signal connection with the temperature sensor 160 and the current adjustment module respectively, and is configured to control the current adjustment module to adjust the current of the electric heating circuit according to the detection result of the temperature sensor 160.

[0136] It should be noted that during the high-temperature treatment of the electrode sheet 200, it is necessary to control the treatment temperature so that after the surface treatment of the electrode sheet 200, the surface temperature of the electrode sheet 200 can be maintained within a certain range. If the surface temperature of the electrode sheet 200 after high-temperature treatment is too low, it may cause the burrs on the surface of the electrode sheet 200 not to be removed completely, or the elastic deformation of the electrode sheet 200 itself not to be fully released. If the surface temperature of the electrode sheet 200 after high-temperature treatment is too high, it may cause oxidation in the area where the conductive coating is not applied on the electrode sheet 200. Therefore, after the electrode sheet 200 is electrically heated by the electric heating component 120, the surface temperature of the electrode sheet 200 can be detected by the temperature sensor 160 to facilitate timely feedback on the situation after the high-temperature treatment of the electrode sheet 200.

[0137] The temperature sensor 160 is a device for detecting the temperature in the surrounding environment and converting it into a corresponding electrical signal. It can be a contact temperature sensor, such as a thermal resistance 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 specific type is not limited in the embodiments of the present application.

[0138] The temperature sensor 160 is disposed in the accommodation 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 region 210 after being processed by the electric heating component 120. In some embodiments, the accommodation cavity 133 is further provided with a temperature sensor 160 for detecting the temperature of the accommodation cavity 133.

[0139] The controller is connected to the temperature sensor 160 and the current adjustment module respectively. The temperature sensor 160 detects the surface temperature of the first region 210 after being processed by the electric heating component 120, and sends it to the controller through a signal transmission method. The controller sends corresponding control and adjustment information to the current adjustment module through a signal transmission method based on the detection result.

[0140] In some embodiments, the preset temperature range of the surface temperature of the first region 210 after being processed by the electric heating component 120 is 200°C - 350°C. The surface temperature detected by the temperature sensor 160 is transmitted to the controller. When the controller determines that the detected surface temperature is less than 200°C, the controller sends a signal to the current adjustment module to increase the current in the electric heating circuit based on the detection result; when the controller determines that the detected surface temperature is between 200°C and 350°C, the controller does not need to send an adjustment signal to the current adjustment module based on the detection result; when the controller determines that the detected surface temperature is greater than 350°C, the controller sends a signal to the current adjustment module to decrease the current in the electric heating circuit based on the detection result.

[0141] By setting the temperature sensor 160 and the controller, the temperature sensor 160 is used to collect the surface temperature of the first region 210 after being processed by the electric heating component 120 in real time, which is convenient for grasping the state of the electrode sheet 200 after being electrically heated, so as to make corresponding adjustments to the surface treatment process of the electrode sheet 200, so that the electrode sheet 200 is in a suitable temperature range and the quality of the electrode sheet 200 is improved.

[0142] According to some embodiments of the present application, as Figure 1 and Figure 3 shown, the electrode sheet surface treatment device 100 further includes a thickness gauge 170 and a controller. The thickness gauge 170 is arranged downstream of the electric heating component 120 along the traveling direction of the electrode sheet 200. The thickness gauge 170 is used to detect the thickness of the first region 210 after being processed by the electric heating component 120; the controller is respectively connected to the thickness gauge 170 and the current adjustment module in a signal connection, and the controller is configured to control the current adjustment module to adjust the current of the electric heating circuit according to the detection result of the thickness gauge 170.

[0143] It should be noted that after the electrode sheet 200 undergoes high-temperature treatment, the elastic deformation of the electrode sheet 200 is released in advance, which will affect the thickness of the electrode sheet 200. If the thickness change of the electrode sheet 200 after the electric heating treatment is too small or too large, it may be that the heating temperature of the electric heating component 120 does not reach the expected range, resulting in insufficient release of the elastic deformation of the electrode sheet 200; or the heating temperature of the electric heating component 120 exceeds the expected range, resulting in damage to the structure of the electrode sheet 200. Therefore, after the electrode sheet 200 is electrically heated by the electric heating component 120, the thickness gauge 170 can be used to detect the thickness of the electrode sheet 200 to judge the effect of the release of the elastic deformation of the electrode sheet 200 after the high-temperature treatment.

[0144] The thickness gauge 170 is an instrument for measuring the thickness of the electrode sheet 200 after being electrically heated by the electric heating component 120, such as an ultrasonic thickness gauge, a laser thickness gauge, etc. The specific type is not limited in the embodiments of the present application.

[0145] In some embodiments, there are multiple thickness gauges 170. One is disposed upstream of the electric heating component 120 along the traveling direction of the pole piece 200, and one is disposed downstream of the electric heating component 120. By obtaining the thickness of the pole piece 200 before and after being processed by the electric heating component 120, the expansion rate of the thickness of the first region 210 is determined; in some embodiments, there is a single thickness gauge 170, which is disposed downstream of the electric heating component 120 along the traveling direction of the pole piece 200. The thickness of the pole piece 200 before electric heating can be pre-recorded and stored in the storage unit of the controller in advance, or can be transmitted to the storage unit of the controller by other relevant detection programs.

[0146] The controller is respectively connected to the thickness gauge 170 and the current adjustment module. The thickness gauge 170 detects the thickness of the pole piece 200 after being processed by the electric heating component 120, and sends it to the controller by means of signal transmission. The controller sends corresponding control adjustment information to the current adjustment module by means of signal transmission based on the detection result.

[0147] In some embodiments, the preset expansion range of the first region 210 after being processed by the electric heating component 120 is 7%-9%. The thickness detected by the thickness gauge 170 is transmitted to the controller. When the detected expansion rate is less than 7%, the controller sends a signal to increase the current in the electric heating circuit to the current adjustment module based on the detection result; when the detected expansion change rate is between 7%-9%, the controller does not need to send an adjustment signal to the current adjustment module based on the detection result; when the detected expansion change rate is greater than 9%, the controller sends a signal to decrease the current in the electric heating circuit to the current adjustment module based on the detection result.

[0148] By setting the thickness gauge 170 and the controller, and using the thickness gauge 170 to detect the thickness of the pole piece 200 in real time after being processed by the electric heating component 120, it is convenient to master the state of the pole piece 200 after electric heating treatment, and it is convenient to make corresponding adjustments to the surface treatment process of the pole piece, so that the pole piece 200 is in a suitable temperature range, which is beneficial to releasing the elastic deformation of the pole piece 200.

[0149] The embodiment of the present application provides a battery production device, and this battery production device includes the pole piece surface treatment device 100 of any of the above embodiments.

[0150] As Figure 6 shown, Figure 6 It is a schematic flow chart of a method for treating the surface of a pole piece provided by the embodiment of the present application.

[0151] The embodiment of the present application provides a method for treating the surface of a pole piece, and this treatment method 300 includes:

[0152] Step S310: Transfer the pole piece 200 along a preset traveling direction. The pole piece 200 includes a first region 210 coated with a conductive coating.

[0153] Step S320: Contact the first region 210 of the pole piece 200 with the first conductive member 121 and the second conductive member 122 of the electric heating assembly 120 respectively. The first conductive member 121 is used to connect to the positive electrode of the power supply, and the second conductive member 122 is used to connect to the negative electrode of the power supply. The portion of the first region 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.

[0154] Step S330: Control the electric heating assembly 120 to perform an electric heating treatment on the portion of the first region 210 of the pole piece 200 that is in the electric heating circuit.

[0155] The method for treating the surface of the pole piece disclosed in the embodiments of the present application can be applied to any device that uses electric heating to treat the burrs on the surface of the pole piece.

[0156] Step S310: Start the transfer assembly 110, and control the transfer assembly 110 to transfer the pole piece 200. The transfer speed of the pole piece 200 can be determined according to requirements, such as 5 m / min, 10 m / min, etc. The pole piece 200 includes a current collector and a conductive coating, and the portion of the current collector coated with the conductive coating is the first region 210.

[0157] In some embodiments, the pole piece surface treatment device 100 includes a box body 130. The transfer assembly 110 sends the pole piece 200 into the accommodation cavity 133 through the inlet 131 and exits the accommodation cavity 133 from the outlet 132.

[0158] Step S320: Control the transfer of the pole piece 200 so that the first region 210 of the pole piece 200 contacts the first conductive member 121 and the second conductive member 122 respectively during the traveling process. Control the first conductive member 121 to connect to the positive electrode of the power supply, and control the second conductive member 122 to connect to the negative electrode of the power supply. Thus, the first conductive member 121, the first region 210, the second conductive member 122, and the power supply can form an electric heating circuit.

[0159] 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, passes through the first region 210, and flows into the second conductive member 122 to form an electric heating circuit. 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 pole piece will be melted at high temperature.

[0160] By performing an electrothermal treatment on the first region 210 between the first conductive member 121 and the second conductive member 122, the burrs on the surface of the electrode sheet can be melted at high temperature, thereby removing the burrs on the surface of the electrode sheet; adopting the energization treatment method, the operation is convenient. On the one hand, it can quickly increase the temperature of the electrode sheet 200, which helps to improve the efficiency of burr removal and reduce energy consumption; on the other hand, it can improve the uniformity of the surface temperature of the electrode sheet, which is beneficial to maintaining the structural stability of the electrode sheet 200, and releasing elastic deformation in advance, improving the quality of the electrode sheet 200.

[0161] As Figure 7 shown, Figure 7 This is a schematic flow chart of another method for treating the surface of the electrode sheet provided by the embodiment of the present application.

[0162] According to some embodiments of the present application, step S330 of controlling the electrothermal component to perform an electrothermal treatment on the part of the first region 210 of the electrode sheet 200 in the electrothermal circuit further includes:

[0163] Step S331, obtaining the surface temperature of the first region 210 of the electrode sheet 200 after being processed by the electrothermal component 120.

[0164] Step S332, adjusting the current of the electrothermal circuit based on the surface temperature.

[0165] Step S331, controlling the temperature sensor 160 to detect the surface temperature of the first region 210 after being processed by the electrothermal component 120.

[0166] Step S332, controlling the temperature sensor 160 to send the surface temperature of the first region 210 after being processed by the electrothermal component 120 to the controller through a signal transmission method, and the controller sends corresponding control and adjustment information to the current adjustment module through a signal transmission method based on the detection result.

[0167] By using the temperature sensor 160 to collect the surface temperature of the first region 210 after being processed by the electrothermal component 120 in real time, it is convenient to master the state of the electrode sheet 200 after electrothermal treatment, so as to perform corresponding adjustments to the surface treatment process of the electrode sheet 200, so that the electrode sheet 200 is in a suitable temperature range and the quality of the electrode sheet 200 is improved.

[0168] According to some embodiments of the present application, step S332 of adjusting the current of the electrothermal circuit based on the surface temperature includes: step S3321, in response to the surface temperature being less than the first preset temperature threshold, increasing the current of the electrothermal circuit.

[0169] According to some embodiments of the present application, step S332 of adjusting the current of the electrothermal circuit based on the surface temperature includes:

[0170] Step S3322: In response to the surface temperature being greater than the second preset temperature threshold, reduce the current in the electric heating circuit.

[0171] Wherein, the first preset temperature threshold is less than the second preset temperature threshold.

[0172] After performing step S331: Obtain the surface temperature of the first area 210 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, and one of them is selected for execution, or neither of them is executed.

[0173] 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 by signal transmission. 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 adjustment module based on the detection result. The first preset temperature threshold is, for example, 200°C, 220°C, etc.

[0174] 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 by signal transmission. The controller compares the obtained temperature with the second preset temperature threshold. If the obtained 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 adjustment module based on the detection result. The second preset temperature threshold is, for example, 300°C, 350°C, etc.

[0175] In some embodiments, step S332 further includes step S3323. Step S3321, step S3322, and step S3323 are parallel steps, and one of them is selected for execution. The controller compares the obtained temperature with the first preset temperature threshold and the second preset temperature threshold respectively. If the obtained 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 adjustment module based on the detection result, or sends a control instruction to maintain the status quo.

[0176] By obtaining the surface temperature of the first area 210 processed by the electric heating component 120 and adjusting the current in the electric heating circuit accordingly according to the temperature feedback, the electrode sheet 200 can be maintained within a suitable temperature range, improving the quality of the electrode sheet 200.

[0177] 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.

[0178] In the execution of step S3321, the value range of the first preset temperature threshold is 200°C - 220°C. The controller compares the acquired temperature with the first preset temperature threshold. If the acquired temperature is less than 200°C, the controller determines that the heating temperature is too low. Based on the detection result, the controller sends control adjustment information to increase the current in the electric heating circuit to the current adjustment module through signal transmission. When the current increases, the heat generated in the first region 210 increases, so that the temperature of the first region 210 can exceed 200°C.

[0179] In the execution of step S3322, the value range of the second preset temperature threshold is 330°C - 350°C. The controller compares the acquired temperature with the second preset temperature threshold. If the acquired temperature is greater than 350°C, the controller determines that the heating temperature is too high. Based on the detection result, the controller sends control adjustment information to decrease the current in the electric heating circuit to the current adjustment module through signal transmission. When the current decreases, the heat generated in the first region 210 decreases, so that the temperature of the first region 210 drops below 350°C.

[0180] 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 structure of the electrode sheet 200 can be maintained, and the deformation of the structure of the electrode sheet 200 can be avoided as much as possible, improving the quality of the electrode sheet 200.

[0181] According to some embodiments of the present application, as Figure 7 shown, step S330, controlling the electric heating component 120 to perform electric heating treatment on the part of the first region 210 of the electrode sheet 200 in the electric heating circuit further includes:

[0182] Step S333, obtaining the first thickness of the first region of the electrode sheet after being processed by the electric heating component.

[0183] Step S334, adjusting the current in the electric heating circuit based on the first thickness.

[0184] Step S333 and step S331 are parallel steps. After step S331 is executed, step S332 is executed. After step S333 is executed, step S334 is executed. There is no order of execution between step S333 and step S331. Step S333 and step S331 can be executed simultaneously, or can be executed successively. The embodiments of the present application do not limit this order of execution.

[0185] Step S333, controlling the thickness measuring instrument 170 to detect the first thickness of the first region 210 after being processed by the electric heating component 120.

[0186] Step S334: Control the thickness gauge 170 to send the first thickness of the first area 210 after being processed by the electric heating component 120 to the controller through signal transmission. The controller sends corresponding control and adjustment information to the current adjustment module through signal transmission based on the detection result to adjust the current of the electric heating circuit.

[0187] By using the thickness gauge 170 to detect the thickness of the pole piece 200 in real time after being processed by the electric heating component 120, it is convenient to master the state of the pole piece 200 after being electrically heated, 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 beneficial to releasing the elastic deformation of the pole piece 200.

[0188] According to some embodiments of the present application, step S334: Adjusting the current of the electric heating circuit based on the first thickness includes:

[0189] Step S3341: Obtain the second thickness of the first area 210 of the pole piece 200 before being processed by the electric heating component 120.

[0190] Step S3342: Determine the expansion rate of the first area 210 based on the first thickness and the second thickness. The expansion rate is the ratio of the difference between the first thickness and the second thickness to the second thickness.

[0191] Step S3343: In response to the expansion rate being less than the preset expansion threshold, increase the current of the electric heating circuit. The expansion rate is the ratio of the difference between the first thickness and the second thickness to the second thickness.

[0192] Step S3341: Control the thickness gauge 170 to detect the second thickness of the first area 210 before being processed by the electric heating component 120.

[0193] Step S3342: Control the thickness gauge 170 to send the detected first thickness and second thickness to the controller through signal transmission. The controller obtains the expansion rate of the first area 210 after being electrically heated through the processor. The expansion rate is the ratio of the difference between the first thickness and the second thickness to the second thickness.

[0194] Step S3343: The controller compares the obtained expansion rate with the preset expansion threshold. If the obtained expansion rate is less than the preset expansion threshold, the controller sends control and adjustment information to increase the current in the electric heating circuit to the current adjustment module based on the detection result through signal transmission.

[0195] In some embodiments, the range of the preset expansion threshold is 7% - 9%. If the expansion rate is less than 7%, the controller determines that the heating temperature is too low, and based on the detection result, the controller sends control adjustment information to increase the current in the electric heating circuit to the current adjustment module through signal transmission; if the expansion rate is greater than 9%, the controller determines that the heating temperature is too high, and based on the detection result, the controller sends control adjustment information to decrease the current in the electric heating circuit to the current adjustment module through signal transmission.

[0196] By controlling the expansion rate of the first region 210 within the preset expansion threshold range, the elastic deformation of the electrode sheet 200 is fully released, which is beneficial to improving the quality of the electrode sheet 200.

[0197] According to some embodiments of the present application, as Figure 7 shown, the electric heating component 120 is arranged in the accommodation cavity 133 of the box body 130; before step S310, transporting the electrode sheet 200 along the preset traveling direction, where the electrode sheet 200 includes a first region 210 coated with a conductive coating, the processing method 300 further includes:

[0198] Step S340, supplying a protective gas into the accommodation cavity 133 until the gas concentration of the protective gas in the accommodation cavity 133 reaches a preset concentration threshold.

[0199] Before performing step S310, transporting the electrode sheet 200 along the preset traveling direction, step S340 is performed first.

[0200] Step S340, starting the gas supply unit to supply a protective gas into the accommodation cavity 133 of the box body 130 until the gas concentration of the protective gas in the accommodation cavity 133 reaches a preset concentration threshold. The preset concentration threshold is, for example, 98%, 99%, etc. For the sake of illustration, the preset concentration threshold is taken as 99% for example. Controlling the gas concentration sensor 140 to collect the gas concentration of the protective gas in the accommodation cavity 133, and sending the collection result to the controller through signal transmission. The controller sends corresponding control adjustment information to the gas supply unit based on the detection result through signal transmission.

[0201] Exemplarily, if the controller determines that the collected gas concentration is less than 99%, the controller sends adjustment information for supplying gas 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 adjustment information for stopping gas supply to the gas supply unit through signal transmission.

[0202] In some embodiments, before performing step S310, transporting the electrode sheet 200 along the preset traveling direction, the deviation correction component 150 can also be controlled to adjust the position of the electrode sheet 200 so that the electrode sheet 200 can smoothly pass through the electric heating component 120 during the process.

[0203] By supplying the protective gas to the accommodation cavity 133 in advance, the electrode sheet 200 can be subjected to the electrothermal treatment in the environment of the protective gas, and the probability of oxidation of the electrode sheet 200 during the electrothermal treatment can be reduced.

[0204] According to some embodiments of the present application, as Figure 7 shown, the processing method 300 further includes:

[0205] Step S350: Obtain the gas concentration of the protective gas in the accommodation cavity 133 during the electrothermal treatment.

[0206] Step S360: In response to the gas concentration being lower than the preset concentration threshold, replenish the protective gas into the accommodation cavity 133.

[0207] While performing step S330, controlling the electrothermal component 120 to perform electrothermal treatment on the part of the first region 210 of the electrode sheet 200 that is in the electrothermal circuit, step S350 can also be performed. It should be noted that the "simultaneously" here can be understood as first performing step S330, and step S350 is performed simultaneously during the execution of step S330.

[0208] Step S350: During the electrothermal treatment of the electrode sheet 200, control the gas concentration sensor 140 to collect the gas concentration of the protective gas in the accommodation cavity 133 in real time.

[0209] Step S360: Control the gas concentration sensor 140 to send the gas concentration of the protective gas collected in the accommodation cavity 133 to the controller by signal transmission. The controller compares the obtained gas concentration with the preset concentration threshold. If the obtained gas concentration is lower than the preset concentration threshold, the controller sends the adjustment information of supplying gas to the gas supply unit by signal transmission based on the detection result. The gas supply unit supplies the protective gas to the accommodation cavity 133 until the gas concentration in the accommodation cavity 133 reaches the preset concentration threshold, and then stops supplying the protective gas.

[0210] By detecting the gas concentration of the protective gas in the accommodation cavity 133 in real time during the electrothermal treatment and supplying the protective gas according to the demand, the electrode sheet 200 can be continuously subjected to the electrothermal treatment in the environment of the protective gas, the probability of oxidation of the electrode sheet 200 during the electrothermal treatment can be reduced, and the quality of the electrode sheet 200 can be improved.

[0211] According to some embodiments of the present application, step 330, controlling the electrothermal component 120 to perform electrothermal treatment on the part of the first region 210 of the electrode sheet 200 that is in the electrothermal circuit further includes:

[0212] Step 335: Control the electrothermal component 120 to heat the part of the first area 210 of the pole piece 200 that is in the electrothermal circuit, so that the surface temperature of the part of the first area 210 of the pole piece 200 that is in the electrothermal circuit rises to a preset temperature range within a preset time period after the start of the electrothermal treatment; wherein, the preset time period is less than or equal to 1 s, and the preset temperature range is 200°C - 350°C.

[0213] There is no sequential order in the execution steps between Step 335, Step 331, and Step 332. For example, Step 331 and Step 332 can be executed after Step 335.

[0214] In Step S335, the preset time period can be 0.1 s, 0.2 s, 0.4 s, 0.6 s, 0.8 s, or 1 s, or a value between any two adjacent of the above values. The preset temperature range is set considering the possible differences due to the inconsistent temperature rise rates in different areas 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°C, 220°C, 250°C, 280°C, 300°C, 320°C, 350°C, etc.

[0215] By raising the temperature of the first area 210 between the first conductive member 121 and the second conductive member 122 to between 200°C and 350°C within 1 s, on the one hand, the efficiency of deburring is improved, and on the other hand, the influence time of high temperature on the surface of the pole piece is reduced as much as possible to protect the pole piece structure.

[0216] According to some embodiments of the present application, as Figure 3 and Figure 4 shown, the pole piece surface treatment device 100 includes a conveying component 110, an electrothermal component 120, a box body 130, a gas concentration sensor 140, a deviation correction component 150, a temperature sensor 160, and a thickness gauge 170.

[0217] The electric heating component 120 is located in the accommodation cavity 133 of the box body 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 that are arranged at intervals along the traveling 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 traveling direction of the pole piece 200. A first region 210 of the pole piece 200 forms an electric heating circuit with a part of the first conductive member 121 and the first sub-conductive member 1221, the first conductive member 121, the first sub-conductive member 1221, and the power supply. A part of the first region 210 of the pole piece 200 that is located between the first conductive member 121 and the second sub-conductive member 1222 forms an electric heating circuit with the first conductive member 121, the second sub-conductive member 1222, and the power supply.

[0218] The pole piece 200 includes a plurality of first regions 210 that are arranged at intervals along a first direction; both the first conductive member 121 and the second conductive member 122 include a plurality of first conductive pressure rollers 123; the central axis of the first conductive pressure roller 123 is parallel to the first direction, and the length of the first conductive pressure roller 123 along the first direction is the same as the width of the first region 210 along the first direction. The plurality of first conductive pressure rollers 123 are arranged corresponding to the plurality of first regions 210 along the first direction, and any first conductive pressure roller 123 is in contact with 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.

[0219] The deviation rectifying component 150 is arranged upstream of the electric heating component 120 along the traveling direction of the pole piece 200 and is used to rectify the deviation of the pole piece 200 before it comes into contact with the electric heating component 120.

[0220] The gas concentration sensor 140 is arranged in the accommodation cavity 133 and is used to detect the gas concentration in the accommodation cavity 133, and the controller uses the gas supply unit to adjust the concentration of the protective gas in the accommodation cavity 133.

[0221] The temperature sensor 160 is arranged downstream of the electric heating component 120 along the traveling direction of the pole piece 200 and is used to detect the surface temperature of the first region 10 after being processed by the electric heating component 120.

[0222] The thickness measuring instrument 170 is arranged downstream of the electric heating component 120 along the traveling direction of the pole piece 200 and is used to detect the thickness of the first region 210 after being processed by the electric heating component 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 region 210.

[0223] 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 it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, 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 arranged at intervals along the travel direction of the pole piece, and are in contact with the first region of the pole piece respectively, so that the first region 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; 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; 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.

2. The electrode surface treatment device according to claim 1, 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.

3. The pole piece surface treatment device according to claim 2, 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.

4. The pole piece surface treatment device according to claim 1, 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.

5. The pole piece surface treatment device according to claim 4, 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.

6. The pole piece surface treatment device according to claim 1, 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.

7. The pole piece surface treatment device according to claim 6, 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.

8. The pole piece surface treatment device according to claim 1, 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.

9. The pole piece surface treatment device according to claim 1, 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.

10. The pole piece surface treatment device according to claim 9, 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.

11. The pole piece surface treatment device according to claim 9, 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.

12. A battery production device, characterized in that: A pole piece surface treatment device comprising any one of claims 1-11.

13. 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 11, 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 portion of the first area of ​​the pole piece that is located in the electric heating loop.

14. The processing method according to claim 13, 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.

15. The processing method according to claim 14, 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.

16. The processing method according to claim 15, 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.

17. The processing method according to any one of claims 13 to 16, 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.

18. The processing method according to claim 17, 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.

19. The processing method according to any one of claims 13 to 16, 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.

20. The processing method according to claim 19, 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.

21. The processing method according to any one of claims 13 to 16, 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.

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