Air nozzle and drying box body
By designing the air outlet of the differentiated diameter and setting the air nozzles in staggered settings, the problem of mismatch between the solvent evaporation rate of the electrode sheet thinning area and the main area is solved, and uniform air drying of the electrode sheet of the lithium-ion battery is achieved, improving the cycle stability and safety of the battery.
Patent Information
- Application Number
- CN202421495277.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-06-27
AI Technical Summary
During the production process of lithium-ion batteries, the mismatch of solvent evaporation rates in the thinned area and main area of the electrode sheet leads to uneven temperature and stress distribution, which easily leads to cracking. The existing additive solutions may cause organic residues to affect battery performance.
The air nozzle body is designed to have first and second air outlets of different diameters, which are used to control the air drying force of the air flow counter-slice main area and the thinning area, avoid cracking through differentiated design, and the air nozzles are arranged interlaced in the drying box to achieve uniform air flow coverage.
Without adding additives, uniform air drying in different areas of the pole sheet is achieved to avoid cracking, improve the cycle stability and safety of the battery, and improve air drying efficiency and safety.
Smart Images
Figure CN223258546U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery processing equipment, in particular to an air nozzle and a drying box. Background Art
[0002] As an efficient energy storage system, lithium-ion batteries play a vital role in today's society, especially in the fields of portable digital products and new energy vehicles. With their advantages such as high energy density, long cycle life, no memory effect, and environmental protection and pollution-free, they have become the preferred power source for various applications.
[0003] The coating process is a critical step in the production of lithium-ion batteries, affecting the battery's capacity, charge-discharge performance, and ultimately, cycle life. During the coating process, the electrode material is evenly coated on the surface of the metal foil, which is then oven-treated to remove the solvent.
[0004] Because the thinned areas on both sides of the electrode have a lower surface density than the main area, the solvent in these areas evaporates too quickly under the same air volume. This mismatch in solvent evaporation rates leads to uneven temperature and stress distribution at the interface between the thinned area and the main area, which in turn causes cracking in the electrode material. These cracks can easily become the source of lithium deposition during the battery's charge and discharge cycles, directly affecting the battery's cycle stability and safety.
[0005] To address this issue, many manufacturers have adopted the strategy of adding anti-cracking agents, such as propylene carbonate (PC) or 1,3-butanediol. These anti-cracking agents can enhance the toughness of the electrode, thereby reducing the occurrence of cracking. However, the use of such additives brings new challenges: if they are not fully volatilized during the drying process, they will leave organic residues in the battery. These residues will participate in the battery's chemical reactions, forming byproducts that are not conducive to recycling. Over time, accumulation can damage the battery's internal structure and erode battery performance.
[0006] Therefore, how to achieve different volatilization rates in different areas of the electrode under the same air nozzle without adding additives has become a technical problem that needs to be solved urgently. Utility Model Content
[0007] The main purpose of the utility model is to provide a tuyere and a drying box, aiming to enable different areas of an electrode to achieve different volatilization rates under the same tuyere without adding additives.
[0008] To achieve the above-mentioned object, the present invention provides an air nozzle, comprising: an air nozzle body, wherein the air nozzle body is provided with an air inlet; the air nozzle body is provided with at least one first air outlet communicated with the air inlet and used to guide the airflow input from the air inlet to the main body area of the object to be air-dried; the air nozzle body is further provided with at least one second air outlet communicated with the air inlet and used to guide the airflow input from the air inlet to the thinning area of the object to be air-dried; the diameter of the second air outlet is smaller than the diameter of the first air outlet.
[0009] In one embodiment of the present application, the first air outlet and the second air outlet are located in the same plane, and the airflow blown out from the first air outlet and the second air outlet can cover the surface of the object to be air-dried.
[0010] In one embodiment of the present application, a pressure equalizing port is further provided on the nozzle body.
[0011] In one embodiment of the present application, the diameter of the first air outlet is A, 5mm≥A≥3mm.
[0012] In one embodiment of the present application, the diameter of the second air outlet is B, B=A*C, 15%≥C≥10%.
[0013] In one embodiment of the present application, the shape of the first air outlet is the same as the shape of the second air outlet.
[0014] The present application also discloses a drying box, comprising a drying box body with a channel for the coated electrode to pass through, wherein at least one air nozzle as described above is respectively provided on the two side walls of the channel facing the electrode.
[0015] In one embodiment of the present application, the distance between the nozzle and the pole piece is D, 15mm≥A≥5mm.
[0016] In one embodiment of the present application, the air nozzles on the two side walls of the channel facing the pole piece are staggered.
[0017] In one embodiment of the present application, a negative pressure port is provided on one side of the channel for extracting the gas containing volatile substances in the channel.
[0018] The above technical solution, through the differentiated design of the diameters of the first and second air outlets, can precisely control the drying intensity of the airflow in the main and skived areas. The smaller second air outlet reduces the air volume in the skived area, thereby slowing the evaporation of solvent in the skived area and preventing fractures at the junction of the main and skived areas of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings, wherein:
[0020] Figure 1 This is a three-dimensional structural diagram of the air nozzle of the utility model;
[0021] Figure 2 This is a schematic structural diagram of the drying box of the utility model.
[0022] 10. Air nozzle; 11. Air nozzle body; 12. First air outlet; 13. Second air outlet; 14. Pressure equalizing port; 20. Upper air chamber; 30. Lower air chamber; 40. Pole piece. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.
[0024] like Figures 1 to 2 As shown, in order to achieve the above-mentioned objectives, the present invention provides a nozzle 10, comprising: a nozzle body 11, wherein the nozzle body 11 is provided with an air inlet; the nozzle body 11 is provided with at least one first air outlet 12 which is in communication with the air inlet and is used to guide the airflow input from the air inlet to the main body area of the object to be air-dried; the nozzle body 11 is further provided with at least one second air outlet 13 which is in communication with the air inlet and is used to guide the airflow input from the air inlet to the thinning area of the object to be air-dried; the diameter of the second air outlet 13 is smaller than the diameter of the first air outlet 12.
[0025] Specifically, the nozzle body 11 is made of a metal material, such as an aluminum alloy or alloy steel. Metallic materials have advantages such as high hardness, wear resistance, high temperature resistance, and resistance to deformation. Of course, depending on design requirements, the nozzle body 11 can also be made of other high-temperature-resistant materials, such as silicon nitride. Since these are conventional technologies, they will not be described in detail here.
[0026] The air inlet, located on the side or top of the nozzle body 11, is responsible for introducing external airflow into the nozzle body 11. The first air outlet 12, connected to the air inlet and located on the nozzle body 11, directs airflow directly to the main area of the material to be dried. The second air outlet 13, also connected to the air inlet and located on the nozzle body 11, directs airflow to the thinning area of the material to be dried. The diameter of the second air outlet 13 is smaller than that of the first air outlet 12. The material to be dried in this application is a pole piece 40 coated with an active material.
[0027] By employing this technical solution, the diameters of the first and second air outlets 12, 13 are differentiated, allowing precise control of the drying intensity of the airflow over the main and skived areas. The smaller second air outlet 13 reduces the airflow volume in the skived area, thereby slowing solvent evaporation in the skived area and preventing fractures at the junction of the main and skived areas of the electrode 40.
[0028] In one embodiment of the present application, the first air outlet 12 and the second air outlet 13 are located in the same plane, and the airflow blown out from the first air outlet 12 and the second air outlet 13 can cover the surface of the object to be dried.
[0029] By adopting the above technical solution, the first air outlet 12 and the second air outlet 13 are arranged in the same plane, so that the first air outlet 12 and the second air outlet 13 can independently dry different parts of the object to be air-dried in the same plane. At the same time, the airflow of the first air outlet 12 and the second air outlet 13 can cover the entire surface of the object to be air-dried, thereby ensuring the overall drying of the object to be air-dried, avoiding omissions, and improving the drying efficiency.
[0030] In one embodiment of the present application, a pressure equalizing port 14 is further provided on the nozzle body 11 .
[0031] By adopting the above technical solution and setting the pressure equalizing port 14, the outlet pressure can be effectively kept stable, avoiding the unstable flow rate caused by outlets of different diameters, thereby ensuring a more uniform and stable spraying effect and improving the drying efficiency and processing quality.
[0032] In one embodiment of the present application, the diameter of the first air outlet 12 is A, 5 mm ≥ A ≥ 3 mm.
[0033] By adopting the above technical solution, the diameter of the first air outlet 12 is set between 5mm and 3mm, which can achieve precise control of the airflow. Smaller air outlets can produce more concentrated airflow, which helps to improve the drying or cooling efficiency of the action area and can act more evenly on the surface of the object.
[0034] In one embodiment of the present application, the diameter of the second air outlet 13 is B, B=A*C, 15%≥C≥10%.
[0035] With this technical solution, the diameter B of the second air outlet 13 is determined by the diameter A of the first air outlet 12 and a coefficient C, where C ranges from 10% to 15%. The smaller second air outlet 13 slows the volatilization rate of the thinned area, preventing cracking at the junction between the main body of the electrode 40 and the thinned area.
[0036] In one embodiment of the present application, the shape of the first air outlet 12 is the same as the shape of the second air outlet 13 .
[0037] The present application also discloses a drying box, including a drying box body with a channel for the coated electrode 40 to pass through, and at least one air nozzle 10 as described above is respectively provided on the two side walls of the channel facing the electrode 40.
[0038] Specifically, a drying box body includes a drying box body, which has a channel for the coated electrode 40 to pass through. The top of the channel is provided with an upper air chamber 20, and the bottom of the channel is provided with a lower air chamber 30. The upper air chamber 20 and the channel are connected by at least one air nozzle 10, that is, the air inlet of the air nozzle 10 is connected to the upper air chamber 20, and the first air outlet 12 and the second air outlet 13 are both oriented toward the electrode 40 in the channel. Similarly, the lower air chamber 30 and the channel are connected by at least one air nozzle 10, that is, the air inlet of the air nozzle 10 is connected to the lower air chamber 30, and the first air outlet 12 and the second air outlet 13 are both oriented toward the electrode 40 in the channel.
[0039] The above technical solution can ensure that the electrode 40 is fully dried, and at the same time ensure that the connection between the thinned area and the main body area of the electrode 40 will not break during the drying process.
[0040] In one embodiment of the present application, the distance D between the nozzle 10 and the pole piece 40 is 15 mm ≥ A ≥ 5 mm.
[0041] In one embodiment of the present application, the air nozzles 10 on the two side walls of the channel facing the pole piece 40 are staggered.
[0042] By adopting the above technical solution, by staggeredly arranging the air nozzles 10 on the two side walls, the airflow can be more evenly distributed on the pole piece 40, which can increase the overall airflow coverage area, thereby effectively improving work efficiency and effect.
[0043] In one embodiment of the present application, a negative pressure port is provided on one side of the channel for extracting the gas containing volatile substances in the channel.
[0044] The above technical solution allows for the timely extraction of gases containing volatile substances, effectively preventing their accumulation within the passageway, reducing safety risks such as explosions and fires, and improving the safety of the operating environment. It is conceivable that the volatile gases extracted from the negative pressure port can be treated before discharge, preventing them from being directly discharged into the work environment or the atmosphere, thereby reducing environmental pollution and complying with environmental protection requirements.
[0045] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A tuyere, characterized in that: include: The nozzle body is provided with an air inlet; the nozzle body is provided with at least one first air outlet communicated with the air inlet and used to guide the airflow input from the air inlet to the main area of the object to be air-dried; the nozzle body is also provided with at least one second air outlet communicated with the air inlet and used to guide the airflow input from the air inlet to the thinning area of the object to be air-dried; the diameter of the second air outlet is smaller than the diameter of the first air outlet, and the nozzle body is further provided with a pressure equalizing port; the diameter of the first air outlet is A, 5mm ≥ A ≥ 3mm; the diameter of the second air outlet is B, B = A*C, 15% ≥ C ≥ 10%.
2. The air nozzle according to claim 1, characterized in that: The first air outlet and the second air outlet are located in the same plane, and the airflow blown out from the first air outlet and the second air outlet can cover the surface of the object to be air-dried.
3. The air nozzle according to claim 1, wherein: The shape of the first air outlet is the same as the shape of the second air outlet.
4. A drying box, characterized in that: It comprises a drying box body with a channel for the coated electrode to pass through, and at least one air nozzle as described in any one of claims 1 to 3 is respectively provided on the two side walls of the channel facing the electrode, and a negative pressure port is provided on one side of the channel to extract the gas containing volatile substances in the channel.
5. The drying box according to claim 4, characterized in that: The distance between the air nozzle and the pole piece is D, 15mm≥A≥5mm.
6. The drying box according to claim 4, characterized in that: The air nozzles on the two side walls of the channel facing the pole piece are staggered.