Process for accelerating aging treatment of metal coiled material

Abstract

The invention relates to the technical field of electrolytic copper foils, in particular to a process for accelerating aging treatment of a metal coiled material, which comprises the following steps: step 1, winding a copper foil on a winding roller for standing; secondly, the outer layer and the end face of the copper foil roll are wrapped with a cooling water circulation bag; 3, low-temperature cooling water is introduced into the bag from a top water inlet, and heat on the surface of the copper foil is absorbed; step 4, cooling the heated cooling water from a water outlet at the bottom and then running the cooling water circulation system to finish rapid cooling of the copper foil; 5, monitoring the temperature, the flow rate, the pH value and the flow of the cooling water to ensure that the temperature, the flow rate, the pH value and the flow are within a set range; and 6, the state of the metal coiled material is checked regularly, the aging condition is observed, and system parameters or cooling water components are adjusted according to needs so as to optimize the aging effect. The problem that in the prior art, in the actual using process of a metal coiled material aging treatment process, cooling is accelerated through standing cooling and installation of a fan for blowing, but the effect is not remarkable is solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic copper foil, in particular to a process for accelerating the aging treatment of metal coils. Background Art

[0002] Among the various properties of lithium battery copper foil, "warpage" is an important indicator, which is used to measure the degree of curling of the edges of lithium battery copper foil after cutting. If the warpage is too high, it will seriously affect the back-end application and cause customer complaints. The formation of warpage is mainly due to the uneven internal texture of the copper foil, which produces internal stress, which is manifested macroscopically as the curling of the smooth surface of the copper foil toward the rough surface. Between the raw foil and the slitting process of lithium battery copper foil, there is an aging process (also known as an aging heat treatment process), which is divided into two steps: heating and cooling. The main purpose of heating is to promote the rearrangement of crystals inside the copper foil by heating at a low temperature and keeping it warm for a period of time, thereby reducing the internal stress of the copper foil, and macroscopically reducing the warpage of the copper foil. After the heating is completed, the copper is usually left to stand for a period of time until it cools to room temperature before being transported to the slitting process.

[0003] The aging process is a necessary process connecting raw foil to slitting, and the total aging time is strongly related to production efficiency. The disadvantage of the current aging process is that the total time is long, resulting in slow production turnover efficiency. The aging heating time will change with the heating temperature, copper foil roll length / specifications / performance, and the heating time is relatively uncontrollable. However, the cooling time is only related to the heat dissipation efficiency of the copper foil roll and can be accelerated. At present, the cooling is mainly accelerated by static cooling and installing fans to blow air, but the effect is not significant. To address this problem, a process for accelerating the aging of metal coils is provided. Summary of the invention

[0004] The purpose of the present invention is to provide a process for accelerating the aging treatment of metal coils to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solution: A process for accelerating the aging treatment of metal coils, comprising the following steps:

[0005] Step 1, winding the copper foil on a winding roller and letting it stand;

[0006] Step 2: Wrap the cooling water circulation bag on the outer layer and end surface of the copper foil roll;

[0007] Step 3: Pass low-temperature cooling water into the bag from the top water inlet to absorb the heat from the surface of the copper foil;

[0008] Step 4: The heated cooling water is cooled from the bottom outlet and then enters the cooling water circulation system to complete the rapid cooling of the copper foil;

[0009] Step 5: Monitor the temperature, flow rate, pH value and flow rate of the cooling water to ensure that they are within the set range;

[0010] Step 6: Regularly check the status of the metal coil, observe the aging condition, and adjust the system parameters or cooling water composition as needed to optimize the aging effect.

[0011] Preferably, the temperature of the low-temperature cooling water is 7-12°C.

[0012] Preferably, the cooling water circulation bag comprises a bag body, a water inlet pipe and a water outlet pipe which can be opened or sealed by a sealing buckle.

[0013] Preferably, the cooling water circulation bag is a silica gel bag, a soft PVC bag or a soft PE bag.

[0014] Preferably, the cooling water circulation system includes a cooling water circulation tank, a first water pump, a plate heat exchanger and a second water pump.

[0015] Preferably, the cooling water circulation tank is connected to the water outlet pipe through a delivery pipe, the first water pump is connected to the output end of the cooling water circulation tank through a delivery pipe, the plate heat exchanger is connected to the output end of the first water pump through a delivery pipe, the second water pump is connected to the output end of the plate heat exchanger through a delivery pipe, and the output end of the second water pump is connected to the water inlet pipe through a delivery pipe.

[0016] Preferably, the pH of the cooling water is 6.0-7.0.

[0017] Preferably, the flow rate of the cooling water is 5-8 meters per second.

[0018] Preferably, the flow rate of the cooling water is 0.1 cubic meter per hour.

[0019] Preferably, the cooling water circulation tank is an insulation tank.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In this case, a cooling water circulation bag is wrapped around the outer layer and end surface of the copper foil roll, and low-temperature cooling water is introduced into the bag from the top water inlet to absorb the heat on the surface of the copper foil. The heated cooling water is cooled from the bottom water outlet and then enters the cooling water circulation system to complete the rapid cooling of the copper foil. This can economically and effectively accelerate the cooling process of the copper foil after aging, shorten the aging time, and improve production efficiency. In addition, the cooling water circulation tank and plate heat exchanger involved in the device can be shared with the copper dissolving process, and only the inlet and outlet pipes need to be connected. From the perspective of spatial layout, the difficulty of transformation is low and the cost is low, which solves the problem that the existing metal coil aging treatment process uses static cooling and installation of fans to accelerate cooling during actual use, but the effect is not significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A process flow chart of a process for accelerating aging treatment of metal coils according to the present invention;

[0023] Figure 2 This is a schematic structural diagram of a process water circulation system for accelerating aging treatment of metal coils according to the present invention;

[0024] Figure 3 This is a schematic structural diagram of a process cooling water circulation bag for accelerating the aging treatment of metal coils according to the present invention.

[0025] In the figure: 1. cooling water circulation bag, 2. water outlet pipe, 3. water inlet pipe, 4. cooling water circulation tank, 5. first water pump, 6. plate heat exchanger, 7. second water pump. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 3 The present invention provides a technical solution: a process for accelerating the aging treatment of metal coils, comprising the following steps:

[0028] Step 1, winding the copper foil on a winding roller and letting it stand;

[0029] Step 2: Wrap the cooling water circulation bag on the outer layer and end surface of the copper foil roll;

[0030] Step 3: Pass low-temperature cooling water into the bag from the top water inlet to absorb the heat from the surface of the copper foil;

[0031] Step 4: The heated cooling water is cooled from the bottom outlet and then enters the cooling water circulation system to complete the rapid cooling of the copper foil;

[0032] Step 5: Monitor the temperature, flow rate, pH value and flow rate of the cooling water to ensure that they are within the set range;

[0033] Step 6: Check the status of the metal coil regularly, observe the aging condition, and adjust the system parameters or cooling water composition as needed to optimize the aging effect.

[0034] In this embodiment, the temperature of the low-temperature cooling water is 7-12°C. The temperature of the cooling water directly affects the heat exchange efficiency of the heat exchanger. During the heat exchange process, the cooling water absorbs the heat of the cooled medium to reduce its temperature, thereby achieving a cooling effect. When the cooling water temperature is low, the temperature difference between it and the cooled medium is large, which is conducive to heat transfer, so the heat exchange efficiency is high. On the contrary, when the cooling water temperature is too high, the temperature difference decreases, the heat exchange efficiency decreases, and the cooling effect is weakened. The stability of the cooling water temperature is crucial to the stable operation of the entire cooling system. Too high or too low cooling water temperature may cause system instability. For example, in a refrigeration system, if the cooling water temperature is too high, it will increase the load of the refrigeration unit, reduce the refrigeration efficiency, and may even cause the unit to shut down due to overheating protection. Similarly, if the cooling water temperature is too low, it may cause the condenser to Frost or ice affects the heat exchange efficiency and may damage the equipment. The temperature of cooling water also affects the formation of corrosion and deposits. Within the appropriate pH value and temperature range, cooling water can maintain good stability and reduce the generation of corrosion and deposits. However, when the cooling water temperature is too high, it will accelerate the corrosion process of the metal because high temperature promotes chemical reactions. At the same time, high temperature may also cause minerals and chemicals in the water to precipitate and deposit on the surface of the heat exchanger, forming scale or deposits, reducing the heat exchange efficiency. The temperature of cooling water also has a significant impact on the energy consumption of the system. When the cooling water temperature is too high, in order to maintain the normal operation of the system, it is necessary to increase the flow rate of cooling water or reduce the temperature of cooling water, which will lead to an increase in energy consumption. On the contrary, if the cooling water temperature is too low, although the heat exchange efficiency can be improved, it may also cause the unit to be overcooled and waste energy.

[0035] In this embodiment, the cooling water circulation bag includes a bag body that can be opened or sealed by a sealing buckle, a water inlet pipe, and a water outlet pipe.

[0036] In this embodiment, the cooling water circulation bag is a silica gel bag, a soft PVC bag or a soft PE bag.

[0037] In this embodiment, the cooling water circulation system includes a cooling water circulation tank, a first water pump, a plate heat exchanger and a second water pump.

[0038] In this embodiment, the cooling water circulation tank is connected to the water outlet pipe through a delivery pipe, the first water pump is connected to the output end of the cooling water circulation tank through a delivery pipe, the plate heat exchanger is connected to the output end of the first water pump through a delivery pipe, the second water pump is connected to the output end of the plate heat exchanger through a delivery pipe, and the output end of the second water pump is connected to the water inlet pipe through a delivery pipe. The water pump is a machine for conveying liquid or pressurizing the liquid. It transfers the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It uses the periodic change of the volume of the working room (pump casing or cylinder) in the pump to convey the liquid. The discharge process is intermittent. This type of pump is also called a positive displacement pump, including a reciprocating pump and a rotary pump. The plate heat exchanger is a high-efficiency heat exchanger composed of a series of metals with a certain corrugated shape. The plate heat exchanger is mainly composed of plate heat exchanger plates, sealing gaskets, fixed clamping plates, movable clamping plates, clamping bolts, upper guide rods, lower guide rods and rear columns. Its working principle is to make the cold and hot fluids flow in their respective channels through the thin rectangular channels between the plates, and exchange heat through the plates to achieve the target temperature. The plate heat exchanger has a high heat transfer coefficient, which is usually 3-5 times higher than that of the tube heat exchanger. It can achieve efficient heat transfer at a lower pressure loss. The plate heat exchanger has a compact and lightweight structure and a small footprint, which is only about one-third of the tube heat exchanger. It is suitable for places with limited space. Due to the structural characteristics of the plate heat exchanger, its heat loss is very small and almost negligible, so no additional Insulation measures, plate heat exchangers are made of high-quality materials, have good corrosion resistance and wear resistance, and can operate stably for a long time. Plate heat exchangers are suitable for a variety of media and working conditions, and are widely used in refrigeration, HVAC, air conditioning, oil cooling, chemical industry, metallurgical industry, machinery industry, electric power industry and other fields. Plate heat exchangers can be assembled and adjusted according to actual needs to meet different heat exchange needs. Removable plate heat exchangers can be easily disassembled and cleaned, which is convenient for maintenance and maintenance. Plate heat exchangers can be divided into various types according to different structures, mainly including frame type (removable type) and brazing type. Among them, the frame type plate heat exchanger consists of many stamped corrugated thin plates at a certain interval, sealed by gaskets on all sides, and re-weighted by frames and compression spirals. The plates are stacked and pressed tightly; while the brazed plate heat exchanger is welded together by vacuum brazing to form an irremovable structure. In addition, there are welded plate heat exchangers, spiral plate heat exchangers, plate and coil heat exchangers and other types. Plate heat exchangers are widely used in many fields, such as condensers and evaporators in refrigeration and air-conditioning systems, intermediate heat exchangers in HVAC systems, intermediate heat exchangers in high-rise buildings, etc. In the chemical industry, plate heat exchangers can be used in soda ash industry, synthetic ammonia, alcohol fermentation, resin synthesis cooling and other process processes. In the metallurgical industry, it can be used for heating or cooling aluminate mother liquor, cooling steelmaking process, etc. In addition, plate heat exchangers are also widely used in machinery industry, electric power industry, papermaking industry, textile industry, food industry and other fields.

[0039] In this embodiment, the pH value of cooling water is 6.0-7.0. The effect of the pH value of cooling water on its cooling effect is a complex and critical issue. It is not only related to the heat exchange efficiency of the cooling system, but also directly affects the stability of the system, the formation of corrosion and deposits, and the control of microorganisms. The pH value of cooling water indirectly affects the heat exchange efficiency by affecting the physical and chemical properties of water. Although the pH value itself does not directly determine the heat transfer rate, it indirectly affects the heat exchange process by affecting the conductivity of cooling water, the stability of dissolved substances, and the chemical reaction rate. The pH value of cooling water affects its conductivity. In the pH range of 6.0-7.0, the conductivity of water may be more suitable, which is conducive to the transfer of heat. However, when the pH value deviates from this range, the conductivity of water may decrease, thereby affecting the heat exchange efficiency. However, it should be noted that this effect is usually not decisive and varies in different types of cooling systems. There may be a variety of minerals and chemicals dissolved in cooling water. The stability of these substances depends to a large extent on the pH value of water. In the appropriate pH range, these substances may remain stable and are not easy to precipitate to form deposits. When the pH value deviates from this range, some substances may precipitate and deposit on the surface of the heat exchanger, thereby reducing the heat exchange efficiency. Efficiency, metal parts in the cooling water system (such as pipes, heat exchangers, etc.) may be threatened by corrosion during long-term operation. A low pH value (acidic environment) will accelerate the corrosion process of the metal, because the acidic medium easily reacts with the metal and destroys its surface protective layer. On the contrary, a high pH value (alkaline environment) can slow down the corrosion rate to a certain extent, but it may also cause local corrosion of some metals (such as aluminum). Therefore, controlling the pH value of cooling water within an appropriate range is one of the important measures to prevent metal corrosion. Hardness ions (such as calcium and magnesium ions) in cooling water are easy to form precipitates and deposit on the heat exchanger under inappropriate pH conditions. The surface of the heat exchanger will increase the thermal resistance of the heat exchanger and reduce its heat transfer efficiency. By adjusting the pH value of the cooling water, the formation of these precipitates can be reduced and their deposition rate can be slowed down. In an alkaline environment, the solubility of calcium and magnesium salts is low and they are easy to precipitate and form scale; within the appropriate pH range, these substances can be kept dissolved and their precipitation tendency can be reduced. Disinfectants are often used in cooling water systems to kill or inhibit the growth of microorganisms. However, the effect of disinfectants is often affected by the pH value. Under certain pH conditions, disinfectants may not fully exert their bactericidal effects or produce harmful by-products. Therefore, the pH of cooling water needs to be considered when using disinfectants. The pH value should be adjusted to ensure the best effect and no damage to the system. When the pH value of cooling water is too low, the pH value can be increased by adding an appropriate amount of alkali agent (such as sodium hydroxide, sodium carbonate, etc.). However, it should be noted that different alkali agents have different effects on the corrosiveness of water and the precipitation tendency of hardness salts. Therefore, when choosing an alkali agent, it is necessary to consider many factors such as cost, effect, and scope of application. In order to achieve precise control of the pH value of cooling water, an automated process control system or monitoring equipment can be used to monitor the pH value in the water in real time and adjust it as needed. This ensures that the pH value is always kept within an appropriate range to avoid adverse effects on the system. .

[0040] In this embodiment, the flow rate of cooling water is 5-8 meters per second. The influence of the flow rate of cooling water on its cooling effect is a complex and critical factor, which is directly related to the heat exchange efficiency, stability and energy consumption of the system or equipment. The increase of cooling water flow rate can significantly improve the heat exchange efficiency. The increase of flow rate means that the amount of water passing through the cooling system per unit time increases, thereby accelerating the transfer speed of heat from the system or equipment to the cooling water. This accelerated heat transfer process helps to take away the heat in the system or equipment faster and reduce its temperature. Under the condition of a certain pipe diameter, when the cooling water flow rate increases to a certain extent, the water flow state will change from laminar flow to turbulent flow. Under turbulent conditions, the motion trajectories of particles in the water flow are complex and changeable, which is conducive to the diffusion and transfer of heat in the fluid. Therefore, cooling water under turbulent conditions can more effectively exchange heat with the system or equipment and improve the cooling effect. The Reynolds number is an important parameter to describe the flow characteristics of the fluid. It reflects the ratio of the inertial force to the viscous force of the fluid. In the cooling water system, the Reynolds number increases with the increase of the flow rate. When the Reynolds number exceeds a certain value, the flow state of the fluid changes from laminar flow to turbulent flow, and the heat transfer coefficient increases accordingly, which significantly improves the cooling effect. A larger cooling water flow rate helps to alleviate the temperature fluctuation of the system or equipment, because the increase in water flow rate makes the heat transfer The flow rate is faster and more uniform, reducing the temperature fluctuation caused by heat accumulation. This is especially important for systems or equipment that require high-precision temperature control. In the cooling water system, if the flow rate is too low, it may cause local heat accumulation and fail to dissipate in time, causing local overheating. Increasing the cooling water flow rate can effectively avoid this situation and ensure that the temperature of each part of the system or equipment is uniform. Different systems or equipment have different requirements for cooling water flow rates. When selecting the cooling water flow rate, it is necessary to determine the appropriate flow rate range based on the specific needs of the system or equipment. For systems that require high-precision temperature control, a lower flow rate needs to be selected to ensure To ensure temperature stability; for systems that require rapid heat dissipation, a higher flow rate needs to be selected to improve cooling efficiency. Pipe diameter and material are also important factors affecting the selection of cooling water flow rate. Pipes with smaller diameters will produce higher flow rates at the same flow rate, while pipes with larger diameters will produce lower flow rates. In addition, pipes of different materials have different adaptability to flow rates and need to be selected according to actual conditions. Changes in ambient temperature will also affect the selection of cooling water flow rate. In high temperature environments, the cooling water flow rate may need to be increased to ensure the normal operation of the system or equipment; in low temperature environments, the cooling water flow rate may need to be appropriately reduced to avoid overcooling.

[0041] In this embodiment, the cooling water flow rate is 0.1 cubic meters per hour. The larger the cooling water flow rate, the more water will pass through the cooling system per unit time, so that the heat generated in the system or equipment can be more effectively removed, which helps to reduce the temperature of the system or equipment and improve the cooling efficiency. A larger water flow rate will increase the water flow rate and enhance the heat transfer and heat dissipation effects. The increase in water flow rate makes heat exchange faster, which helps the system or equipment reach the required temperature range in a short time. A large cooling water flow rate can alleviate the fluctuation of cooling water temperature and enable the system or equipment to operate in a more stable temperature environment, which helps to improve the reliability and stability of the system and reduce failures and maintenance costs caused by temperature fluctuations. An appropriate water flow rate can ensure that the system or equipment operates within the appropriate temperature range and avoid overheating or overcooling. This is of great significance for protecting the system or equipment from damage and extending its service life. Changes in ambient temperature will also affect the cooling water flow rate. In a high temperature environment, the cooling water flow rate may need to be increased to ensure the normal operation of the system or equipment; while in a low temperature environment, the cooling water flow rate may need to be appropriately reduced to avoid overcooling.

[0042] In this embodiment, the cooling water circulation tank is a heat preservation tank, which can avoid a large amount of heat exchange between the cooling water and the external air, thereby preventing the normal use of the cooling water from being affected, thereby improving the stability of the process flow in actual use;

[0043] In this example, 2 rolls of copper foil (8um, 10000m) were aged at 80℃ for 20h. After leaving the oven, the surface temperature of the two rolls was measured to be 75℃. One roll was left at room temperature (control group), and one roll was wrapped with a cooling water circulation device (experimental group). The surface temperature of the two rolls of copper foil was then tested every hour. The cooling water temperature was 10℃, and the flow rate was 0.1m 3 / h, the control group dropped to 30℃ after 8 hours (75→62→52→46→42→39→35→32→30℃), and the experimental group dropped to 30℃ after 4 hours (75→54→41→36→30℃), shortening the duration by 50%.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A process for accelerating the aging treatment of metal coils, characterized in that: The steps include: Step 1, winding the copper foil on a winding roller and letting it stand; Step 2: Wrap the cooling water circulation bag on the outer layer and end surface of the copper foil roll; Step 3: Pass low-temperature cooling water into the bag from the top water inlet to absorb the heat from the surface of the copper foil; Step 4: The heated cooling water is cooled from the bottom outlet and then enters the cooling water circulation system to complete the rapid cooling of the copper foil; Step 5: Monitor the temperature, flow rate, pH value and flow rate of the cooling water to ensure that they are within the set range; Step 6: Regularly check the status of the metal coil, observe the aging condition, and adjust the system parameters or cooling water composition as needed to optimize the aging effect.

2. The process for accelerating the aging treatment of metal coils according to claim 1, characterized in that: The temperature of the low-temperature cooling water is 7-12°C.

3. The process for accelerating the aging treatment of metal coils according to claim 1, characterized in that: The cooling water circulation bag comprises a bag body which can be opened or sealed by a sealing buckle, a water inlet pipe and a water outlet pipe.

4. The process for accelerating the aging treatment of metal coils according to claim 1, characterized in that: The cooling water circulation bag is a silica gel bag, a soft PVC bag or a soft PE bag.

5. The process for accelerating the aging treatment of metal coils according to claim 3, characterized in that: The cooling water circulation system includes a cooling water circulation tank, a first water pump, a plate heat exchanger and a second water pump.

6. A process for accelerating the aging treatment of metal coils according to claim 5, characterized in that: The cooling water circulation tank is connected to the water outlet pipe through a delivery pipe, the first water pump is connected to the output end of the cooling water circulation tank through a delivery pipe, the plate heat exchanger is connected to the output end of the first water pump through a delivery pipe, the second water pump is connected to the output end of the plate heat exchanger through a delivery pipe, and the output end of the second water pump is connected to the water inlet pipe through a delivery pipe.

7. The process for accelerating the aging treatment of metal coils according to claim 1, characterized in that: The pH of the cooling water is 6.0-7.

0.

8. The process for accelerating the aging treatment of metal coils according to claim 1, characterized in that: The flow rate of the cooling water is 5-8 meters per second.

9. The process for accelerating the aging treatment of metal coils according to claim 1, characterized in that: The flow rate of the cooling water is 0.1 cubic meter per hour.

10. The process for accelerating the aging treatment of metal coils according to claim 5, characterized in that: The cooling water circulation tank is a heat preservation tank.

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