CN114864860B - Feeding mechanism, feeding device and dry electrode film preparation device - Google Patents

Abstract

The invention relates to the technical field of battery preparation equipment, and in particular to a feeding mechanism, a feeding device and a dry electrode film preparation device. The feeding mechanism includes a shell, a leveling device and a heating device. There is a chamber inside the casing. The leveling device is used to disperse the materials in the chamber. The heating device is located on the outer peripheral wall of the casing or in the chamber to heat the materials in the chamber until they become fluffy. The feeding mechanism provided by the invention can achieve a uniformly dispersed state of materials before rolling, and then transport the dispersed powder to the rolling device, thereby effectively solving the problem of agglomeration and agglomeration of the powder before rolling. The agglomeration causes problems such as poor surface density uniformity, poor edge uniformity, and surface defects in the rolled electrode film. This improves the mechanical properties of the dry electrode film and enables the continuous production of dry electrodes with uniform thickness and neat edges. The purpose of the membrane can also improve battery performance.

Description

Feeding mechanism, feeding device and dry electrode film preparation device

Technical field

The present invention relates to the technical field of battery preparation equipment, and in particular to a feeding mechanism, a feeding device and a dry electrode film preparation device.

Background technique

With the rapid growth of social economy, people's demand for resources and energy is increasing, which also poses challenges to environmental governance. Therefore, it is urgent to develop and use clean, efficient, and green new energy. As a key technology in the field of new energy, the research and development of electrochemical energy storage devices has become a global hot spot. In particular, vehicle electrification has become an industry trend in recent years. Lithium-ion battery preparation technology is a key technology for the electrification development of the automotive industry. Traditional lithium-ion battery preparation often adopts a wet process, using water or organic solvents to prepare slurries and then coating them and then drying them. This not only causes environmental pollution during the preparation process, but drying also leads to a large consumption of energy, increasing the Preparation costs.

In order to solve the above problems, dry electrode preparation technology has become a research hotspot in recent years. Dry electrode preparation technology is to mix active materials, conductive materials, binders, etc. into a mixed powder, then fiberize it through high-speed shearing force, and then roll the fiberized mixture into a continuous self-supporting dry electrode The electrode film is finally pressed with the current collector to form a dry electrode plate. This dry process for preparing lithium battery pole pieces is simpler, consumes less energy, occupies less equipment, makes the production process greener, has lower costs, and has good environmental and cost advantages.

However, during the dry process, materials are prone to agglomeration and agglomeration, which in turn leads to defects such as poor surface density uniformity and poor edge neatness in the rolled electrode membrane.

Contents of the invention

The invention provides a feeding mechanism, a feeding device and a dry electrode film preparation device to solve the problem of poor uniformity of surface density and edges of electrode films rolled out by rollers due to agglomeration and agglomeration of materials in the prior art. Problems such as poor uniformity can be improved to improve the mechanical properties of dry electrode films and continuously produce dry electrode films with uniform thickness and neat edges.

The invention provides a feeding mechanism of a dry electrode film preparation device, which includes:

The housing has a chamber inside, and the chamber is suitable for placing materials for preparing dry electrode membranes. The chamber is provided with a feeding port and a feeding port, and the feeding port is located on the the lower end of the chamber;

A leveling device used to disperse the materials in the chamber;

A heating device is provided on the outer peripheral wall of the housing or in the chamber for heating the material in the chamber until it becomes fluffy.

According to the loading mechanism of a dry electrode film preparation device provided by the present invention, the heating device is a microwave heating device, an electromagnetic induction heating device, an infrared heating device or a thermal radiation heating device.

According to the feeding mechanism of a dry electrode film preparation device provided by the present invention, it also includes a temperature control system. The temperature control system is communicatively connected to the heating device. The temperature control system is used to adjust the temperature of the heating device. temperature.

According to the feeding mechanism of a dry electrode film preparation device provided by the present invention, the material leveling device is a stirring and dispersing device, and the material leveling device is located in the chamber.

According to the feeding mechanism of a dry electrode membrane preparation device provided by the present invention, the stirring and dispersing device includes at least one stirring paddle, and the stirring paddle is a spiral stirring paddle, a meniscus-shaped stirring paddle, or a twist-type stirring paddle.

According to the feeding mechanism of a dry electrode film preparation device provided by the present invention, the material leveling device is an air blowing and dispersing device, and the material leveling device is located in the chamber.

According to the loading mechanism of a dry electrode film preparation device provided by the present invention, the air blowing and dispersing device includes a plurality of air blowing nozzles, and the plurality of air blowing nozzles are arranged at intervals in the chamber.

According to the loading mechanism of a dry electrode membrane preparation device provided by the present invention, a unloading valve is provided at the unloading port, and the opening of the unloading valve is adjustable.

The invention also provides a feeding device for a dry electrode film preparation device, which includes:

A feeding mechanism, which is the feeding mechanism as described above;

A conveying channel, one end of which is connected and communicated with the unloading port of the loading mechanism;

A vibration mechanism is provided at the conveying channel.

According to the feeding device of a dry electrode film preparation device provided by the present invention, the vibration mechanism is located on the outer periphery of the conveying channel,

Either the vibration mechanism is located at the entrance of the conveying channel, or the vibration mechanism is located at the exit of the conveying channel.

According to the feeding device of a dry electrode film preparation device provided by the present invention, the vibration mechanism is connected to a frequency adjustment system, and the frequency adjustment system is used to adjust the vibration frequency of the vibration mechanism.

The invention also provides a dry electrode film preparation device, including:

A feeding device, which is the feeding device as described above;

A rolling device. The feed port of the rolling device is connected to the other end of the conveying channel of the feeding device. Materials enter the rolling device through the conveying channel to be pressed into a dry electrode film.

According to a dry electrode film preparation device provided by the present invention, the rolling device includes multi-stage rollers, and each stage of the rollers has a rolling gap.

According to the dry electrode film preparation device provided by the present invention, the device further includes a heating element, and the heating element is used to heat the rolling device.

The feeding mechanism of the dry electrode film preparation device provided by the present invention is provided with a leveling device and a heating device at the loading mechanism. The heating device can make the material in a fluffy state, and the leveling device can make the material disperse evenly, so that the material is in a fluffy state. Before rolling, the fluffy and evenly dispersed state can be obtained. The dispersed powder is then transported to the rolling device, and then the powder is pressed into a dry electrode film of a certain thickness through rolling, which effectively solves the problem. The powder before rolling is agglomerated and agglomerated, which causes problems such as poor surface density uniformity, poor edge uniformity, and surface defects in the rolled electrode film. This improves the mechanical properties of the dry electrode film and enables continuous production. The purpose of dry electrode films with uniform thickness and neat edges can also improve battery performance.

Description of the drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are the drawings of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a dry electrode film preparation device provided by the present invention;

Figure 2 is a schematic structural diagram of the dry electrode film preparation device provided by the present invention from another perspective;

Reference signs:

1. Dry electrode membrane preparation device; 300. Materials;

100. Feeding device;

110. Feeding mechanism;

111. Shell; 112. Chamber; 113. Feeding port; 114. Discharging port;

115. Heating device; 116. Stirring and dispersing device;

120. Conveying channel; 130. Vibration mechanism;

200. Rolling device; 210. Roller.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

The dry electrode film preparation device 1 according to the embodiment of the present invention will be described below with reference to FIGS. 1 to 2 . It should be noted that the dry electrode film preparation device 1 can be used to prepare dry electrode films.

As shown in FIGS. 1 and 2 , the dry electrode film preparation device 1 includes a feeding device 100 and a rolling device 200 . The feeding device 100 is used to uniformly disperse the material 300 and transport it to the rolling device 200 at a constant speed. The rolling device 200 is used to roll the material 300 into a finished electrode film with a preset thickness.

The loading device 100 includes a loading mechanism 110 , a conveying channel 120 and a vibration mechanism 130 . Among them, the vibration mechanism 130 is provided at the conveying channel 120, and one end of the conveying channel 120 is connected to the feeding mechanism 110. The material 300 in the loading mechanism 110 can flow into the conveying channel 120 , and under the vibration of the vibration mechanism 130 , the material 300 can evenly flow to the roller pressing device 200 . The rolling device 200 has a rolling function for the material 300, so that the material 300 can be rolled into a dry electrode film. Specifically, the feed port of the rolling device 200 is connected to the other end of the conveying channel 120, and the material 300 enters the rolling device 200 through the conveying channel 120 to be pressed into a dry electrode film.

Referring to Figure 1, the feeding mechanism 110 may include: a housing 111, a material leveling device and a heating device. Among them, the housing 111 has a chamber 112 inside, and the chamber 112 is suitable for placing the materials 300 for preparing dry electrode membranes. The chamber 112 is provided with a feeding port 113 and a feeding port 114, and the feeding port 114 is located in the chamber. The lower end of 112, the unloading port 114 is connected with one end of the conveying channel 120. In some examples, a discharge valve is provided at the discharge port 114, and the opening of the discharge valve is adjustable, so that the speed at which the material 300 falls can be adjusted by using the discharge valve with an adjustable opening. The material dispersing device is used to disperse the materials 300 in the chamber 112 to achieve the purpose of evenly dispersing the materials 300 .

Referring to Figure 1, the heating device 115 can heat the housing 111, thereby maintaining the temperature inside the chamber 112 within a preset temperature range. It should be noted that the material 300 will be in a fluffy state after being heated, which will help the material 300 disperse evenly. The specific location of the heating device 115 is not limited here. For example, in some examples, the heating device 115 can be provided on the outer peripheral wall of the housing 111 or in the chamber 112 for heating the material 300 in the chamber 112 . Heat until fluffy. In some examples, the heating device 115 may be a microwave heating device 115, an electromagnetic induction heating device 115, an infrared heating device 115, or a thermal radiation heating device 115.

According to the dry electrode film preparation device 1, the feeding mechanism 110 and the feeding device 100 of the embodiment of the present invention, the feeding mechanism 110 is provided with a material leveling device and a heating device 115. The heating device 115 can keep the material 300 in a fluffy state. The leveling device can disperse the materials evenly, and the material 300 in a fluffy state is more easily dispersed and evenly mixed under the action of the leveling device.

In this way, the material 300 can be uniformly dispersed before rolling, and then the dispersed powder is transported to the rolling device 200, and then the powder is pressed into a dry electrode film of a certain thickness through rolling, which effectively solves the problem. Due to the agglomeration and agglomeration of the powder before rolling, the electrode membrane rolled out by the roller has problems such as poor surface density uniformity, poor edge uniformity, and surface defects. The mechanical properties of the dry electrode membrane have been improved to achieve continuous production. The purpose of obtaining a dry electrode film with uniform thickness and neat edges can also improve battery performance.

According to some embodiments of the present invention, the loading mechanism 110 may also include a temperature control system. The temperature control system is communicatively connected to the heating device 115. The temperature control system is used to adjust the temperature of the heating device 115. The temperature control system can control the temperature in the chamber 112 so that the temperature in the chamber 112 is always maintained within a certain temperature range, thereby achieving the purpose of keeping the material 300 fluffy.

Of course, the form of the leveling device is not limited to this. For example, in some examples, as shown in FIG. 2 , the leveling device may be a stirring and dispersing device 116 , and the leveling device is disposed in the chamber 112 . The stirring and dispersing device 116 has a stirring effect on the material 300 and evenly disperses the original material 300 into the dispersed material 300 to prevent the material 300 from agglomerating. The stirring and dispersing device 116 may include at least one stirring blade, and the stirring blade is a spiral stirring blade, a meniscus-shaped stirring blade, or a twist-shaped stirring blade. The stirring and dispersing device 116 can achieve the purpose of dispersing the material 300 in the chamber 112 through rotational movement, swinging movement, or flipping movement.

For another example, the material leveling device can be an air blowing and dispersing device, and the air blowing and dispersing device can blow air into the material 300 to achieve the purpose of dispersing the material 300 . The air blowing and dispersing device includes a plurality of air blowing nozzles. The plurality of air blowing nozzles are spaced in the chamber 112 . The air flow can be blown out through the air blowing nozzles and flow to the material 300 .

It should be noted that there is no specific limitation on the number and type of the leveling device here. The leveling device may be one or more of the stirring and dispersing device 116 and the air blowing and dispersing device. That is, when there is one leveling device, the leveling device can be a stirring and dispersing device 116 or an air blowing and dispersing device; when there are multiple leveling devices, the structure of the leveling devices can be the same or different, and each leveling device can be the same or different. The material device may be a stirring and dispersing device 116 or an air blowing and dispersing device.

According to some embodiments of the present invention, referring to Figures 1 and 2, the dispersed material 300 enters the conveying channel 120 through the discharge port 114, and under the vibration of the vibration mechanism 130, the material 300 is spread evenly in the conveying channel 120 , at the same time, the flat material 300 is conveyed to the other end of the conveying channel 120 at a uniform speed. The specific position of the vibration mechanism 130 is not limited here. For example, the vibration mechanism 130 can be located on the outer periphery of the conveying channel 120; for another example, the vibration mechanism 130 can be located at the entrance of the conveying channel 120 (that is, one end of the conveying channel 120). ; For another example, the vibration mechanism 130 is located at the exit position of the conveying channel 120 (that is, the other end of the conveying channel 120).

Further, the vibration mechanism 130 can be connected to a frequency adjustment system, and the frequency adjustment system is used to adjust the vibration frequency of the vibration mechanism 130 . It should be noted that the frequency adjustment system can adjust the vibration amplitude or vibration frequency of the vibration mechanism 130. Under the action of different vibration amplitudes or vibration frequencies, the transportation speed of the material 300 in the conveying channel 120 is different, so the frequency adjustment can be used. The system adjusts the conveying speed of the material 300.

According to some embodiments of the present invention, referring to FIG. 1 , the rolling device 200 may include multi-stage rollers 210 , each stage of roller 210 having a different rolling gap, preferably set to a rolling gap of from an initial roller to a final roller. From large to small, the gap of the last stage roller 210 can be the same as the thickness of the target dry electrode film. In this way, the dry electrode film pressed by the multi-stage rollers 210 has a uniform thickness and good edge neatness. Here, the finished dry electrode film can be a positive dry electrode film used to prepare the electrode, or a negative dry electrode film used to prepare the electrode. The finished dry electrode film is bonded with the current collector or foil and then rolled to form the finished dry electrode film. electrode.

In some embodiments, the dry electrode film preparation device 1 may also include a heating element, which is used to heat the rolling device 200, which may be to heat the roll itself or to heat the entire rolling environment. Furthermore, the dry electrode film preparation device 1 may also include a temperature adjustment system, which is used to control the temperature of the heating element, thereby facilitating the control of the temperature during the dry electrode film preparation process.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be used Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent substitutions are made to some of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (11)

1. A loading mechanism for a dry electrode film preparation device, which is characterized by comprising: The housing has a chamber inside, and the chamber is suitable for placing materials for preparing dry electrode membranes. The chamber is provided with a feeding port and a feeding port, and the feeding port is located on the the lower end of the chamber; A leveling device is used to disperse the materials in the chamber. The leveling device is an air blowing and dispersing device. The leveling device is located in the chamber; A heating device is provided on the outer peripheral wall of the housing or in the chamber for heating the material in the chamber until it becomes fluffy. 2. The loading mechanism of the dry electrode film preparation device according to claim 1, wherein the heating device is a microwave heating device, an electromagnetic induction heating device, an infrared heating device or a thermal radiation heating device. 3. The feeding mechanism of the dry electrode film preparation device according to claim 2, further comprising a temperature control system, the temperature control system is communicatively connected to the heating device, and the temperature control system is used for Adjust the temperature of the heating device. 4. The loading mechanism of the dry electrode film preparation device according to claim 1, wherein the air blowing and dispersing device includes a plurality of air blowing nozzles, and the plurality of air blowing nozzles are spaced apart from the air blowing nozzles. inside the chamber. 5. The loading mechanism of the dry electrode membrane preparation device according to claim 1, wherein the unloading port is provided with a unloading valve, and the opening of the unloading valve is adjustable. 6. A feeding device for a dry electrode film preparation device, which is characterized in that it includes: A feeding mechanism, the feeding mechanism is a feeding mechanism according to any one of claims 1-5; A conveying channel, one end of which is connected and communicated with the unloading port of the loading mechanism; A vibration mechanism is provided at the conveying channel. 7. The loading device of the dry electrode film preparation device according to claim 6, wherein the vibration mechanism is located on the outer periphery of the conveying channel, Either the vibration mechanism is located at the entrance of the conveying channel, or the vibration mechanism is located at the exit of the conveying channel. 8. The loading device of the dry electrode film preparation device according to claim 6, wherein the vibration mechanism is connected to a frequency adjustment system, and the frequency adjustment system is used to adjust the vibration frequency of the vibration mechanism. 9. A dry electrode film preparation device, characterized in that it includes: A feeding device, the feeding device is a feeding device according to any one of claims 6-8; A rolling device. The feed port of the rolling device is connected to the other end of the conveying channel of the feeding device. Materials enter the rolling device through the conveying channel to be pressed into a dry electrode film. 10. The dry electrode film preparation device according to claim 9, wherein the rolling device includes a multi-stage roller, and each stage of the roller has a rolling gap. 11. The dry electrode film preparation device according to claim 9, further comprising a heating element for heating the rolling device.