Temperature control device for composite current collector equipment and composite current collector equipment

Abstract

The present application proposes a temperature control device and a composite current collector device. The temperature control device is applied to the composite current collector device. The temperature control device comprises: a cooling component and an actuating component. The cooling component is configured to cool a base film carried by a conveying roller. The cooling component comprises a hollow structure for passing a cooling liquid. The surface of the cooling component faces the conveying roller. The actuating component is configured to actuate the cooling component to adjust the temperature of the base film.

Description

Technical Field

[0001] The present application relates to the field of new energy batteries, and in detail, to a temperature control device and a composite current collector device applied to a composite current collector device. Background Art

[0002] At present, the composite current collectors in the lithium battery industry include composite copper foil / aluminum foil, which is a new lithium battery material with great potential. The manufacturing process of the composite current collector is mainly to plate a thin metal layer on the polymer material layer, among which evaporation is a common process to plate the metal on the polymer material layer. Evaporation is to heat and vaporize the metal at high temperature in a vacuum device, and the gaseous metal atoms are deposited on the surface of the substrate, which greatly improves the thickness uniformity and conductivity. However, the commonly used base film is basically used at a temperature below 100°C. Therefore, there is a high possibility of heat deformation during the vacuum evaporation process, affecting the quality of the finished product.

[0003] Current technologies usually use cooling technology to avoid the possibility of thermal deformation of the base film. For example, a cooling medium may be introduced into the evaporation roller. However, this method cannot accurately adjust the temperature of the base film, and therefore cannot ensure the properties, yield and mass production requirements of the composite current collector. Summary of the invention

[0004] In view of this, the present application proposes a temperature control device and an apparatus for preparing a composite current collector to solve the problems in the background technology.

[0005] According to one embodiment of the present application, a temperature control device is provided. The temperature control device is applied to a composite current collector device. The temperature control device comprises: a cooling component and an actuating component. The cooling component is configured to cool a base film carried by a conveying roller. The cooling component comprises a hollow structure for passing a cooling liquid. The surface of the cooling component faces the conveying roller. The actuating component is configured to actuate the cooling component to adjust the temperature of the base film.

[0006] In some embodiments, the cooling assembly includes a plurality of cooling tubes extending along a first direction and arranged in parallel.

[0007] In certain embodiments, the surface of the cooling assembly facing the conveyor roller is composed of outer surfaces of the plurality of cooling tubes.

[0008] In some embodiments, the hollow structure is composed of a conveying conduit of the plurality of cooling tubes.

[0009] In certain embodiments, the cooling assembly includes a hollow baffle.

[0010] In certain embodiments, the surface of the cooling assembly facing the conveyor roller consists of the outer surface of the hollow partition.

[0011] In some embodiments, the hollow structure consists of a hollow structure of the hollow partition.

[0012] In certain embodiments, the surface of the cooling assembly facing the conveyor roller is a flat surface, an S-shaped surface, a serrated surface, or an irregular surface.

[0013] In some embodiments, the cooling assembly further includes an outer frame, the outer frame including a first bracket and a second bracket, and the surface of the cooling assembly facing the conveying roller is disposed between the first bracket and the second bracket.

[0014] In certain embodiments, the first bracket and the second bracket are actuatable.

[0015] In some embodiments, the first bracket and the second bracket may extend along a second direction.

[0016] In some embodiments, the first direction is a direction parallel to the central axis of the conveying roller, and the second direction is a vertical direction or a circumferential direction of the conveying roller.

[0017] In certain embodiments, the actuating component actuates the cooling component to change the distance between the cooling component and the conveying roller, the inclination angle of the cooling component relative to the horizontal plane, and / or the cooling range of the conveying roller by the cooling component to adjust the temperature of the base film.

[0018] In some embodiments, the actuating assembly includes a pulley, a slide rail, a main connecting rod, a secondary connecting rod and a stepper motor, wherein the slide rail extends along a third direction; the pulley is mounted on the slide rail; the main connecting rod is embedded in the pulley to be linked with the pulley; the secondary connecting rod is connected between one end of the main connecting rod and the outer frame; the stepper motor is connected to the main connecting rod to push the main connecting rod to move along the third direction, thereby adjusting the distance between the cooling assembly and the conveying roller and the inclination angle of the cooling assembly relative to the horizontal plane.

[0019] In some embodiments, the actuating assembly further includes a rotating shaft, which connects the first bracket and the second bracket to operate in conjunction with the first bracket and the second bracket, and the stepper motor is connected to the rotating shaft to push the first bracket and the second bracket to extend along the second direction, thereby adjusting the cooling range of the conveying roller by the cooling assembly.

[0020] In some embodiments, the actuating component also includes an electronic control system and a temperature sensor, wherein the electronic control system is electrically connected to the temperature sensor, and the temperature sensor is configured to detect the temperature of the base film. The electronic control system controls the stepper motor to actuate the cooling component according to the temperature of the base film.

[0021] In some embodiments, the electronic control system is also electrically connected to a cooling liquid supply device, and the electronic control system controls the flow rate of the cooling liquid provided by the cooling liquid supply device according to the temperature of the base film.

[0022] According to one embodiment of the present application, a composite current collector device is provided. The composite current collector device comprises: a conveying roller, an evaporation assembly and the above-mentioned temperature control device. The conveying roller is configured to carry a base film. The evaporation assembly is arranged below the conveying roller. The evaporation assembly is configured to evaporate a metal layer on the base film. The temperature control device is arranged between the conveying roller and the evaporation assembly.

[0023] In some embodiments, the composite current collector device further comprises a carrier, which is configured to carry the temperature control device, and the actuating assembly is further configured to control the movement of the carrier to control the gap between the two carriers to adjust the evaporation area of ​​the base film.

[0024] In some embodiments, the evaporation assembly includes a crucible and a reaction gas inlet element. The reaction gas inlet element is disposed between the crucible and the base film. The reaction gas inlet element is used to introduce reaction gas when cooling the base film.

[0025] The temperature control device and composite current collector equipment proposed in the present application can adjust the distance between the cooling component and the conveying roller, the inclination angle of the cooling component relative to the horizontal plane, the cooling range of the cooling component to the conveying roller, and the size of the evaporation area of ​​the base film according to the temperature of each part of the base film and the required process temperature, thereby achieving accurate and rapid cooling effect on the base film, ensuring the mechanical properties and appearance of the composite current collector while achieving a high yield and meeting the needs of mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application but do not constitute a limitation to the present application. In the accompanying drawings:

[0027] Figure 1 A schematic diagram illustrating a composite current collector device according to an embodiment of the present application.

[0028] Figure 2A and 2BA three-dimensional schematic diagram and a cross-sectional schematic diagram of a temperature control device according to an embodiment of the present application are respectively demonstrated.

[0029] Figure 3A , Figure 3B and Figure 3C The three-dimensional view, side view and top view of a cooling assembly and an actuating assembly according to an embodiment of the present application are respectively demonstrated. DETAILED DESCRIPTION

[0030] The following disclosure provides a variety of implementations or illustrations that can be used to implement different features of the present disclosure. The specific examples of components and configurations described below are used to simplify the present disclosure. As can be imagined, these descriptions are only illustrative and are not intended to limit the present disclosure. For example, in the description below, forming a first feature on or above a second feature may include certain embodiments in which the first and second features are directly in contact with each other; and may also include certain embodiments in which additional components are formed between the above-mentioned first and second features, so that the first and second features may not be in direct contact. In addition, the present disclosure may reuse component symbols and / or labels in multiple embodiments. Such repetition is based on the purpose of simplicity and clarity, and does not itself represent the relationship between the different embodiments and / or configurations discussed.

[0031] Furthermore, spatially relative terms such as "below," "below," "below," "above," and the like may be used herein to facilitate description of the relationship between one component or feature shown in the figure relative to another or more components or features. These spatially relative terms are intended to encompass a variety of different orientations of the device during use or operation in addition to the orientation shown in the figure. The device may be placed in other orientations (e.g., rotated 90 degrees or in other orientations), and these spatially relative descriptive terms should be interpreted accordingly.

[0032] Although the numerical ranges and parameters used to define the broader scope of the present application are approximate values, the relevant numerical values ​​in the specific embodiments have been presented as accurately as possible. However, any numerical value inherently inevitably contains standard deviations due to individual test methods. Here, "about" generally refers to the actual value within plus or minus 10%, 5%, 1% or 0.5% of a specific value or range. Alternatively, the term "about" means that the actual value falls within the acceptable standard error of the mean value, depending on the consideration of a person with ordinary knowledge in the technical field to which the present application belongs. It should be understood that, except for the experimental examples, or unless otherwise explicitly stated, all ranges, quantities, values ​​and percentages used herein (for example, to describe the amount of material used, the length of time, temperature, operating conditions, quantitative ratios and other similar ones) are modified by "about". Therefore, unless otherwise stated to the contrary, the numerical parameters disclosed in this specification and the attached claims are all approximate values ​​and can be changed as needed. At least these numerical parameters should be understood as the number of significant digits indicated and the values ​​obtained by applying the general rounding method. Herein, numerical ranges are expressed from one endpoint to another endpoint or between two endpoints; unless otherwise stated, the numerical ranges described herein include the endpoints.

[0033] Figure 1 Demonstrating a schematic diagram of a composite current collector device 10 according to an embodiment of the present application. The composite current collector device 10 is configured to prepare a composite current collector. In some embodiments, the composite current collector device 10 can be plated with a metal layer on both sides of the base film B by evaporation to form a composite current collector, wherein the base film B can be a polymer material, such as but not limited to PET or PP. In some embodiments, the thickness of the base film B is 0 to 20 μm. In some embodiments, the base film B uses a PP base film with a thickness of 6 μm and a width of 1100 mm. In some embodiments, the base film B may include any one or a mixture of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, polyphenylene sulfide, polyphenylene oxide, polyacrylonitrile, cellulose acetate, polystyrene or polyimide.

[0034] In certain embodiments, the composite current collector device 10 includes a unwinding roller 01, a plurality of auxiliary conveying rollers 03, conveying rollers 11 and 11', evaporation components 21 and 21', temperature control devices 31 and 31', and a winding roller 02, wherein the base film B is released from the unwinding roller 01, passes through the conveying roller 11, a plurality of auxiliary conveying rollers 03 and the conveying roller 11', and is finally wound up by the winding roller 02, wherein the conveying roller 11, the evaporation component 21 and the temperature control device 31 are used in combination to perform evaporation on the first side of the base film B to coat a metal layer, and the conveying roller 11', the evaporation component 21' and the temperature control device 31' are used in combination to perform evaporation on the second side of the base film B to coat a metal layer, and the base film B after evaporation forms a composite current collector having a structure of metal layer-base film B-metal layer.

[0035] Since the conveying roller 11, the evaporation assembly 21 and the temperature control device 31 and the conveying roller 11', the evaporation assembly 21' and the temperature control device 31' are substantially two sets of the same components, respectively performing evaporation deposition on both sides of the base film B. Therefore, in the subsequent embodiments, the combination of the conveying roller 11, the evaporation assembly 21 and the temperature control device 31 will be described to save space.

[0036] In some embodiments, the evaporation assembly 21 may include an electron gun, a wire feeding device, a crucible and other evaporation elements. In some embodiments, the evaporation assembly 21 may also include a reaction gas inlet element (not shown), which is arranged between the crucible and the base film B, and is used to pass the reaction gas while cooling the base film B. In some embodiments, the reaction gas inlet element is arranged on both sides of the crucible. In some embodiments, the number of inlets of the reaction gas inlet element may be multiple (for example, 0-100). In some embodiments, the inlet of the reaction gas inlet element is inclined at an angle of 0-45° relative to the horizontal plane. The reaction gas reacts with the evaporated atoms to generate compounds, and the reaction gas inlet element is closed when the pure metal film needs to be prepared by evaporation. The direction of the gas inlet of the reaction gas inlet element is at a certain angle to the crucible, which can avoid affecting the evaporation rate, and can improve the gas utilization rate, avoid the gas from diffusing too quickly to the entire furnace cavity, and avoid the accumulation of evaporated metal atoms for too long to block the gas inlet.

[0037] In some embodiments, the two parts of the temperature control device 31 are respectively arranged on the carrier 231 and the carrier 232. In some embodiments, the carrier 231 and the carrier 232 are movable laterally. The gap D23 between the carrier 231 and the carrier 232 forms an exposed coating area of ​​the base film B. When the carrier 231 and the carrier 232 are close to each other, the gap D23 is reduced, and the exposed coating area of ​​the base film B is reduced, so that the heated area of ​​the base film B is reduced, and the cooling effect can also be achieved.

[0038] Figure 2A and 2BThe three-dimensional schematic diagram and the cross-sectional schematic diagram of the temperature control device 31 according to an embodiment of the present application are respectively demonstrated. In some embodiments, the temperature control device 31 is a symmetrical structure arranged on both sides of the conveying roller 11. In some embodiments, the temperature control device 31 includes a cooling component 301 and an actuating component 302. In some embodiments, the cooling component 301 is configured to cool the base film B carried by the conveying roller 11. In some embodiments, the cooling component 301 includes a hollow structure K301 for passing a cooling liquid, and a surface S301 of the cooling component 301 faces the conveying roller 11.

[0039] Figure 3A , Figure 3B and Figure 3C The three-dimensional view, side view and top view of the cooling assembly 301 and the actuating assembly 302 according to an embodiment of the present application are respectively demonstrated. In some embodiments, the cooling assembly 301 includes Figure 3A The plurality of cooling tubes 41 extend in the X-axis direction and are arranged in parallel. The extension direction of the plurality of cooling tubes 41 is parallel to the direction of the central axis of the conveying roller 11. In some embodiments, each cooling tube 41 includes a conveying pipe X41 therein, and each conveying pipe X41 serves as a hollow structure K301 for passing cooling liquid. The conveying pipe X41 of each cooling tube 41 is connected to a cooling liquid supply device (not shown), and the cooling liquid supply device supplies cooling liquid to the conveying pipe X41. In some embodiments, the surfaces S41 of the plurality of cooling tubes 41 are arranged to form the surface S301 of the cooling assembly 301 as a whole.

[0040] It should be noted that the present application does not limit the cooling assembly 301 to be composed of multiple cooling tubes 41. In other embodiments, the cooling assembly 301 may be composed of a single hollow partition, the internal hollow structure of the hollow partition serves as a hollow structure K301 for passing the coolant, and the outer surface of the hollow partition constitutes the surface S301 of the cooling assembly 301. The coolant flows in the internal hollow structure of the hollow partition to cool the base film B, wherein the outer surface of the hollow partition may be of any shape, such as but not limited to, a plane, an S shape, a serrated shape, an arc shape or an irregular shape. By designing different outer surface shapes, the flow path of the coolant in the hollow partition is increased or shortened, and different cooling effects can be achieved.

[0041] It should be noted that the present application does not limit the cooling assembly 301 to only allow the cooling liquid to cool the base film B. Those skilled in the art should understand that when the hollow structure K301 of the cooling assembly 301 is passed with high-temperature liquid, the base film B can be heated. In addition, the temperature control device 31 is a symmetrical structure arranged on both sides of the conveying roller 11. The present application does not limit the cooling assemblies 301 on both sides of the base film B to cool the base film B at the same time, and does not limit the process parameters of the cooling assemblies 301 on both sides (including but not limited to the cooling liquid temperature, cooling liquid flow, tilt angle, distance from the base film B, etc.) to be exactly the same.

[0042] In some embodiments, the cooling assembly 301 further includes an outer frame 42. In some embodiments, the outer frame 42 includes a first bracket 421 and a second bracket 422, and a surface S301 of the cooling assembly 301 facing the conveying roller 11 is arranged between the first bracket 421 and the second bracket 422. In some embodiments, both ends of each cooling tube 41 are respectively embedded in the first bracket 421 and the second bracket 422. In some embodiments, the first bracket 421 and the second bracket 422 are actuable. The first bracket 421 and the second bracket 422 can be extended or contracted when actuated, and the projection area of ​​the surface S301 of the cooling assembly 301 mapped to the surface of the conveying roller 11 can be adjusted by adjusting the spacing between the plurality of cooling tubes 41, thereby changing the cooling range of the base film B by the cooling assembly 301.

[0043] In some embodiments, the first bracket 421 and the second bracket 422 are fixed at one end on the carrier 231 or the carrier 232 by the base 431 and the base 432 respectively, and the other end of the first bracket 421 and the second bracket 422 is movable. Figure 3A The first bracket 421 and the second bracket 422 can be actuated in the Z-axis direction to extend or retract the cooling tube 41. Figure 3B The plurality of cooling tubes 41 are extended or contracted by actuating in the direction of arrow F, wherein the direction of arrow F is the circumferential direction of the conveying roller 11 .

[0044] In other embodiments, one end of the first bracket 421 and the second bracket 422 are not fixed by the base 431 and the base 432. In other words, both ends of the first bracket 421 and the second bracket 422 are movable, thereby expanding the extension range and increasing the cooling range of the cooling component 301 on the base film B.

[0045] In some embodiments, the first bracket 421 and the second bracket 422 may be multi-joint structures to arbitrarily adjust the arrangement shape of the plurality of cooling tubes 41. For example, after the first bracket 421 and the second bracket 422 are actuated, the surface S301 of the cooling assembly 301 may be a plane, an S-shape, a serrated shape, an arc shape, or an irregular shape.

[0046] In some embodiments, the cooling assembly 301 includes one or more composite materials of high temperature resistant and corrosion resistant materials such as stainless steel, titanium, zirconium, and ceramics.

[0047] It is understandable that factors such as the distance between the cooling assembly 301 and the conveying roller 11, the tilt angle of the cooling assembly 301 relative to the horizontal plane, and the cooling range of the cooling assembly 301 on the conveying roller 11 will affect the cooling effect of the base film B. These factors can be changed by actuating the first bracket 421 and the second bracket 42 according to the temperature of each part of the base film B and the required process temperature, thereby adjusting the temperature of the base film B to achieve the required effect. In some embodiments, the distance between the cooling assembly 301 and the conveying roller 11 is in the range of 0-100 mm, and the tilt angle of the cooling assembly 301 relative to the horizontal plane is in the range of 0-45°.

[0048] In some embodiments, the actuating assembly 302 is connected to the cooling assembly 301, and the actuating assembly 302 is configured to actuate the cooling assembly 301. In some embodiments, the actuating assembly 302 can actuate the first bracket 421 and the second bracket 42 according to the temperature of each part of the base film B and the required process temperature, so as to at least adjust the distance between the cooling assembly 301 and the conveying roller 11, the inclination angle of the cooling assembly 301 relative to the horizontal plane, and / or the cooling range of the conveying roller 11 by the cooling assembly 301.

[0049] In some embodiments, the actuator assembly 302 includes a pulley 51, a slide rail 52, a main connecting rod 53, a secondary connecting rod 54, and a stepper motor 55. In some embodiments, the main connecting rod 53 extends along the X-axis direction. The main connecting rod 53 includes a positioning protrusion 531, which is located at both ends of the main connecting rod 53 and extends and embeds in the pulley 51. By embedding the positioning protrusion 531 in the pulley 51, the main connecting rod 53 can be linked with the pulley 51. In some embodiments, the secondary connecting rod 54 is connected between the positioning protrusion 531 and the outer frame 42. In some embodiments, the slide rail 52 extends along the X-axis direction. Figure 3A The pulley 51 extends in the Y-axis direction shown in FIG. 5 , and is mounted on the slide rail 52 .

[0050] In some embodiments, the stepper motor 55 is connected to the main connecting rod 53 through the connecting arm 551 and the connecting arm 552, wherein the connecting arm 551 and the connecting arm 552 can be extended and retracted along the Y-axis direction. The stepper motor 55 pushes the main connecting rod 53 with the connecting arm 551 and the connecting arm 552, so that the main connecting rod 53 moves along the Y-axis direction on the slide rail 52 through the pulley 51, and at the same time pushes the cooling assembly 301 through the auxiliary connecting rod 54, thereby adjusting the distance between the cooling assembly 301 and the conveying roller 11. In some embodiments, when the first bracket 421 and the second bracket 42 are respectively fixed at one end to the table with the base 431 and the base 432, the stepper motor 55 pushes the main connecting rod 53 to move along the Y-axis direction through the connecting arm 551 and the connecting arm 552, and in addition to adjusting the distance between the cooling assembly 301 and the conveying roller 11, the inclination angle of the cooling assembly 301 relative to the horizontal plane is also adjusted at the same time.

[0051] In some embodiments, the actuating assembly 302 may further include a rotating shaft (not shown), which is connected to the first bracket 41 and the second bracket 42 to be linked with the first bracket 41 and the second bracket 42, and the rotating shaft is also connected to the stepper motor 55. When the stepper motor 55 pushes the rotating shaft, it pushes the first bracket 41 and the second bracket 42 along the axis of rotation. Figure 3A The Z-axis direction shown or Figure 3B The arrow F direction shown extends, and by adjusting the spacing between the plurality of cooling tubes 41 , the projection area of ​​the surface S301 of the cooling assembly 301 mapped onto the surface of the conveying roller 11 is adjusted, thereby changing the cooling range of the cooling assembly 301 on the conveying roller 11 .

[0052] In some embodiments, the actuator assembly 302 may also include an electronic control system 56 and a temperature sensor 57 (shown in FIG. Figure 2B ). In some embodiments, the electronic control system 56 is electrically connected to the temperature sensor 57, and the temperature sensor 57 is configured to detect the temperature of the base film B. The electronic control system 56 controls the actuating component 302 to actuate the cooling component 301 according to the temperature of each part of the base film B and the required process temperature, and achieves the required effect by adjusting the distance between the cooling component 301 and the conveying roller 11, the inclination angle of the cooling component 301 relative to the horizontal plane, and / or the cooling range of the conveying roller 11 by the cooling component 301. In some embodiments, the electronic control system 56 can also be electrically connected to the cooling liquid supply device, and the electronic control system 56 controls the cooling liquid supply device to provide the flow rate of the cooling liquid delivered to the delivery channel X41 according to the temperature of each part of the base film B and the required process temperature.

[0053] In some embodiments, the actuator assembly 302 may be further electrically connected to the carrier 231 and the carrier 232, and control the size of the gap D23 between the carrier 231 and the carrier 232 according to the temperature of each part of the base film B and the required process temperature, so as to adjust the evaporation area of ​​the base film B and adjust the heating area of ​​the base film B. In some embodiments, the actuator assembly 302 controls the gap D23 to be within the range of 0-300 mm.

[0054] like Figure 2B As shown, the temperature sensor 57 can be disposed between the conveying roller 11 and the evaporation assembly 21. However, this is not a limitation of the present application. In other embodiments, the temperature sensor 57 can be disposed on the outer frame 42 or other locations convenient for detecting the temperature of the base film B.

[0055] The following is a process flow of preparing a composite current collector using the composite current collector device 10:

[0056] Example 1

[0057] First, the vacuum degree in the chamber was reduced to 6×10 -3 pa, and heat to 60°C; the unwinding roller 01 releases the base film B, and the base film B is plasma treated by a plasma treatment device (not shown) arranged between the unwinding roller 01 and the conveying roller 11, wherein the unwinding speed of the unwinding roller 01 is 10m / s.

[0058] Next, the water inlet of the coolant supply device is opened to supply coolant to the cooling assembly 301. The inclination angle of the fixed cooling assembly 301 relative to the horizontal plane is 30°, the straight-line distance between the fixed cooling assembly 301 and the base film B is 5 cm, the width of the exposed coating area is set to 20 cm, and the coolant flow rate is 300 sccm.

[0059] Next, the electron gun of the evaporation component 21 is preheated, the input voltage is 10KV, and the wire feeding device conveys the copper wire at a speed of 10m / min. After a layer of copper is evenly melted on the surface of the crucible, the crucible baffle is opened to evaporate the base film B. The unwinding speed of the unwinding roller 01 is 5m / s, and a 1μm copper layer is deposited on both sides of the base film B.

[0060] After the above steps, a composite current collector with metal layers plated on both sides and good appearance and no deformation is obtained.

[0061] Example 2

[0062] The steps and process parameters are the same as those in Example 1, except that a temperature sensor 57 is used to detect the temperature of the base film B in real time and adjust the flow rate of the cooling liquid in real time to keep the temperature of the base film B stable.

[0063] Example 3

[0064] The steps and process parameters are the same as those in Example 2, except that when the temperature sensor 57 detects that the temperature of the base film B is too high, the actuator component 302 controls the distance between the cooling component 301 and the base film B, the inclination angle of the cooling component 301 relative to the horizontal plane, and the width D23 of the exposed evaporation area to keep the base film temperature stable.

[0065] When the melting point of the base film B is Tm, it is defined that when the temperature T of the base film B detected by the temperature sensor 57 is in the range of 0.5Tm<T<Tm, the temperature is too high. Under this definition, the distance between the cooling assembly 301 and the base film B, the inclination angle of the cooling assembly 301 relative to the horizontal plane, and the width D23 of the exposed evaporation area are adjusted, and other parameters are kept unchanged. For the finished products prepared with the above parameters, 4 samples with a size of 300mm×300mm are selected, and the number of visible pinholes is checked by 10 times magnification, and the following Table 1 is obtained:

[0066] Table 1

[0067]

[0068]

[0069] It can be seen from Table 1 that when the temperature is too high, the cooling effect is best when adjusting the vertical distance between the cooling component 301 and the base film B; at the same time, the appropriate reduction of the evaporation area D23 helps to reduce the heated area of ​​the base film B, and the inclination angle of the cooling component 301 also has a certain influence on the cooling area of ​​the base film B. The larger the inclination angle, the larger the cooling area and the better the cooling effect.

[0070] When the temperature is 0.5Tm<T<0.7Tm, the preferred parameters are: the distance between the cooling component 301 and the base film B is 100mm, the inclination angle is 30°, the width D23 of the evaporation area is 150mm, and 4 pinholes are detected under a 10x magnification after sampling the base film B; when the temperature is 0.7Tm<T<Tm, the preferred parameters are: the distance between the cooling component 301 and the base film B is 50mm, the inclination angle is 30°, the width D23 of the evaporation area is 200mm, and 8 pinholes are detected under a 10x magnification after sampling the base film.

[0071] Example 4

[0072] The experimental process is generally the same as the processing method of Example 3. On the basis of Example 3, the temperature on one side can be controlled separately. The cooling component 301 before coating preheats the thicker base film B to 0.8-1Tg to ensure that it is tightly bonded with metal atoms during subsequent evaporation. The cooling component 301 on the other side cools the base film B after the base film B is coated to ensure that it will not remain at a high temperature and adhere to the adjacent base film during subsequent winding, affecting product quality. Among them, Tg is the glass transition temperature, that is, the starting temperature point at which the polymer material transitions from the glass state to the high elastic state.

[0073] Example 5

[0074] First, the vacuum degree in the chamber was reduced to 6×10 -3 pa, and heat to 60°C; the unwinding roller 01 releases the base film B, and the base film B is plasma treated by a plasma treatment device (not shown) arranged between the unwinding roller 01 and the conveying roller 11, wherein the unwinding speed of the unwinding roller 01 is 10m / s.

[0075] Next, the water inlet of the coolant supply device is opened to supply coolant to the cooling assembly 301. The inclination angle of the fixed cooling assembly 301 relative to the horizontal plane is 30°, the straight-line distance between the fixed cooling assembly 301 and the base film B is 5 cm, the width of the exposed coating area is set to 20 cm, and the coolant flow rate is 300 sccm.

[0076] Next, the electron gun of the evaporation component 21 is preheated with an input voltage of 10KV. The wire feeding device conveys the aluminum wire at a speed of 10m / min. After a layer of copper is evenly melted on the surface of the crucible, the crucible baffle is opened. The reaction gas inlet elements of the evaporation components 11 and 21 are opened to introduce reaction gases such as oxygen. The flow rate of the reaction gas is 300sccm. After first preparing a 50nm Al2O3 seed layer on the base film B, the base film B is evaporated. The unwinding speed of the unwinding roller 01 is 2m / s, and a 1μm metal layer is deposited on both sides of the base film B.

[0077] After the above steps, a composite current collector with metal layers plated on both sides and good appearance and no deformation is obtained.

[0078] Comparative Example 1

[0079] The experimental process is substantially the same as the treatment method of Example 1, except that the temperature control device 31 is not installed, and the base film B is cooled only by passing cooling water into the evaporation roller.

[0080] Comparative Example 2

[0081] The experimental process is substantially the same as the treatment method of Example 5, except that the temperature control device 301 is not installed and the gas inlet of the reaction gas inlet element is located on the left and right sides of the chamber instead of between the crucible and the base film B.

[0082] For the above embodiments, the applicant conducted appearance quality inspection and mechanical property test on the finished composite current collector.

[0083] In the appearance quality inspection part, three samples of 300mm×300mm in size were selected for each of the finished products made in the above embodiments, and the surface of the film layer was visually inspected for wrinkles, cracks, and deformation, and the area ratio was estimated; since the pinholes on the surface of the composite current collector are often mechanical weak points and performance defects, affecting subsequent use, a pinhole tester was used to detect the pinholes of the above embodiment samples, and the number of pinholes with a diameter of 50μm>>20μm and a diameter of <20μm was recorded; when wrinkles, pinholes, etc. appeared on the surface of the current collector, the conductivity would decrease accordingly, and the square resistance would increase, so a four-probe resistance tester was used to detect the square resistance of the embodiment samples. Finally, the test results of the above embodiments are summarized in Table 2 below.

[0084] Table 2

[0085]

[0086]

[0087] For the mechanical property test, three specimens with a size of 13 mm × 254 mm were prepared in the horizontal and vertical directions of the above specimens. A universal mechanical testing machine was used to clamp both ends of the specimens, exposing a test area of ​​100 mm in length. The test was carried out at a tensile speed of 50 mm / min, and the data obtained are shown in Table 3 below.

[0088] Table 3

[0089]

[0090] It can be seen from Table 2 and Table 3 that the appearance of the metal layers of Examples 1-5 all meet the requirements, and the defective ratio is within 10%; the sheet resistance also meets the actual requirements, and the appearance quality and mechanical properties of Example 5 after Al2O3 primer and then aluminum layer vapor deposition are better than those of Example 2, which proves that the technology proposed in this application has indeed improved the appearance, mechanical and conductive properties of the composite current collector.

[0091] As used herein, the terms "approximately", "substantially", "substantially" and "about" are used to describe and take into account small changes. When used in conjunction with an event or situation, the term may refer to an example where the event or situation occurs exactly and an example where the event or situation occurs very approximately. As used herein with respect to a given value or range, the term "about" generally means within ±10%, ±5%, ±1% or ±0.5% of a given value or range. A range may be expressed herein as from one endpoint to another or between two endpoints. Unless otherwise specified, all ranges disclosed herein include endpoints. The term "substantially coplanar" may refer to two surfaces within a few microns (μm) positioned along the same plane, for example, within 10 μm, within 5 μm, within 1 μm or within 0.5 μm positioned along the same plane. When referring to a "substantially" identical numerical value or characteristic, the term may refer to a value within ±10%, ±5%, ±1% or ±0.5% of the average value of the value.

[0092] As used herein, the terms "approximately," "substantially," "substantially," and "about" are used to describe and explain small variations. When used in conjunction with an event or circumstance, the terms may refer to instances where the event or circumstance occurred exactly as well as instances where the event or circumstance occurred very approximately. For example, when used in conjunction with a numerical value, the terms may refer to a range of variation of less than or equal to ±10% of the numerical value, for example, less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. For example, two values ​​may be considered "substantially" or "approximately" the same if the difference between them is less than or equal to ±10% of the average of the values ​​(e.g., less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%). For example, "substantially" parallel can refer to an angular variation range of less than or equal to ±10° relative to 0°, for example, less than or equal to ±5°, less than or equal to ±4°, less than or equal to ±3°, less than or equal to ±2°, less than or equal to ±1°, less than or equal to ±0.5°, less than or equal to ±0.1°, or less than or equal to ±0.05°. For example, "substantially" vertical can refer to an angular variation range of less than or equal to ±10° relative to 90°, for example, less than or equal to ±5°, less than or equal to ±4°, less than or equal to ±3°, less than or equal to ±2°, less than or equal to ±1°, less than or equal to ±0.5°, less than or equal to ±0.1°, or less than or equal to ±0.05°.

[0093] For example, two surfaces may be considered coplanar or substantially coplanar if the displacement between the two surfaces is equal to or less than 5 μm, equal to or less than 2 μm, equal to or less than 1 μm, or equal to or less than 0.5 μm. A surface may be considered planar or substantially planar if the displacement between any two points on the surface relative to the plane is equal to or less than 5 μm, equal to or less than 2 μm, equal to or less than 1 μm, or equal to or less than 0.5 μm.

[0094] As used herein, the singular terms "a", "an" and "the" may include plural referents unless the context clearly dictates otherwise. In the description of some embodiments, a component provided "on" or "over" another component may encompass the case where the former component is directly on (e.g., physically in contact with) the latter component, as well as the case where one or more intermediate components are located between the former component and the latter component.

[0095] As used herein, spatially relative terms such as "below," "below," "lower," "above," "upper," "lower," "left," "right," etc. may be used herein for ease of description to describe the relationship of one component or feature to another component or feature as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly. It should be understood that when a component is referred to as being "connected to" or "coupled to" another component, it may be directly connected or coupled to the other component, or intervening components may be present.

[0096] The foregoing summarizes several embodiments and detailed features of the present disclosure. The embodiments described in the present disclosure can be easily used as a basis for designing or modifying other processes and structures for performing the same or similar purposes and / or obtaining the same or similar advantages of the embodiments introduced herein. These equivalent constructions do not depart from the spirit and scope of the present disclosure and various changes, substitutions and modifications may be made without departing from the spirit and scope of the present disclosure.

Claims

1. A temperature control device for a composite current collector device, the temperature control device comprising: A cooling component configured to cool the base film carried by the conveying roller, the cooling component comprising a hollow structure for passing a cooling liquid, and a surface of the cooling component facing the conveying roller; as well as an actuation assembly connected to the cooling assembly and configured to actuate the cooling assembly to adjust the temperature of the base film; The cooling assembly is composed of a plurality of cooling pipes extending in a first direction and arranged in parallel; The hollow structure is composed of the delivery pipes of the plurality of cooling pipes; The cooling assembly further comprises an outer frame, the outer frame comprising a first bracket and a second bracket, the surface of the cooling assembly facing the conveying roller being arranged between the first bracket and the second bracket; The first bracket and the second bracket are actuatable; The first bracket and the second bracket may extend along a second direction; The first direction is a direction parallel to the central axis of the conveying roller, and the second direction is a vertical direction or a circumferential direction of the conveying roller; The actuating assembly actuates the cooling assembly to change the distance between the cooling assembly and the conveying roller, the inclination angle of the cooling assembly relative to the horizontal plane, and the cooling range of the conveying roller by the cooling assembly to adjust the temperature of the base film; The first bracket and the second bracket can be extended or contracted when actuated, and the projection area of ​​the surface of the cooling component mapped to the surface of the conveying roller can be adjusted by adjusting the spacing between the multiple cooling tubes, thereby changing the cooling range of the cooling component on the base film.

2. The temperature control device according to claim 1, characterized in that: The surface of the cooling assembly facing the conveying roller is composed of outer surfaces of the plurality of cooling tubes.

3. The temperature control device according to claim 1, characterized in that: The cooling assembly includes a hollow baffle.

4. The temperature control device according to claim 3, characterized in that: The surface of the cooling assembly facing the conveyor roller is composed of the outer surface of the hollow partition.

5. The temperature control device according to claim 4, characterized in that: The hollow structure is composed of the hollow structure of the hollow partition.

6. The temperature control device according to claim 1, characterized in that: The surface of the cooling assembly facing the conveying roller is a flat surface, an S-shaped surface, a serrated surface, an arc-shaped surface or an irregular surface.

7. The temperature control device according to claim 1, characterized in that: The actuating assembly includes a pulley, a slide rail, a main connecting rod, a secondary connecting rod and a stepper motor, wherein: The slide rail extends along a third direction; The pulley is mounted on the slide rail; The main connecting rod is embedded in the pulley to be linked with the pulley; The secondary connecting rod is connected between one end of the main connecting rod and the outer frame; The stepper motor is connected to the main connecting rod to push the main connecting rod to move along the third direction, thereby adjusting the distance between the cooling component and the conveying roller and the inclination angle of the cooling component relative to the horizontal plane.

8. The temperature control device according to claim 7, characterized in that: The actuating assembly also includes a rotating shaft, which connects the first bracket and the second bracket to operate in conjunction with the first bracket and the second bracket. The stepper motor is connected to the rotating shaft to push the first bracket and the second bracket to extend along the second direction, thereby adjusting the cooling range of the conveying roller by the cooling assembly.

9. The temperature control device according to claim 8, characterized in that: The actuating component also includes an electrical control system and a temperature sensor. The electrical control system is electrically connected to the temperature sensor. The temperature sensor is configured to detect the temperature of the base film. The electrical control system controls the stepper motor to actuate the cooling component according to the temperature of the base film.

10. The temperature control device according to claim 9, characterized in that: The electric control system is also electrically connected to a cooling liquid supply device, and the electric control system controls the flow rate of the cooling liquid provided by the cooling liquid supply device according to the temperature of the base film.

11. A composite current collector device, characterized in that: include: a conveying roller configured to carry a base film; An evaporation assembly is disposed below the conveying roller, and the evaporation assembly is configured to evaporate a metal layer on the base film; as well as The temperature control device according to any one of claims 1 to 10 is arranged between the conveying roller and the evaporation assembly.

12. The composite current collector device according to claim 11, characterized in that: Also includes: The carrier is configured to carry the temperature control device, and the actuating component is further configured to control the movement of the carrier to control the gap between the two carriers to adjust the evaporation area of ​​the base film.

13. The composite current collector device according to claim 11, characterized in that: The evaporation assembly includes a crucible and a reaction gas inlet element. The reaction gas inlet element is arranged between the crucible and the base film. The reaction gas inlet element is used to introduce reaction gas when cooling the base film.

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