Humidifying device for negative pole piece of lithium battery

Abstract

The utility model relates to a lithium battery negative pole piece humidifying device which is used for humidifying a negative pole piece and comprises a box body, an atomizing piece and a fan, the box body is provided with an inlet and an outlet for the negative pole piece to penetrate through, and water is stored at the bottom in the box body; the atomizing sheet is mounted at the bottom in the box body and is used for enabling water in the box body to form water mist; the fan is installed on the box body and used for blowing air into the box body. The inlet and the outlet for the negative pole piece to penetrate through are formed in the box body, the atomizing piece is arranged to generate water mist, the fan blows air into the box body to enable the water mist to be circularly and evenly distributed in the box body, the negative pole piece before entering the drying box penetrates in from the inlet and penetrates out from the outlet, the upper face and the lower face of the negative pole piece can be evenly humidified, and the drying efficiency of the negative pole piece is improved. The pole piece is fully wetted before entering the drying oven, the temperature of the pole piece drying oven does not need to be frequently adjusted, water mist does not need to be manually sprayed to the negative pole piece, operation is easy and convenient, and the problem of pole piece cracking is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a humidification device for the negative electrode sheet of a lithium battery. Background Technology

[0002] In the production of lithium batteries, electrode coating generally refers to the process of uniformly coating a well-mixed lithium battery slurry onto copper or aluminum foil, and then drying the organic solvent in the slurry. The coating process typically uses a coating machine, which includes a front-end, a back-end, an oven, and a winding device. The front-end and back-end die devices of the coating machine are responsible for uniformly coating the slurry from the mixing process onto the copper or aluminum foil. The oven of the coating machine is responsible for drying the coated electrode material. After drying, it flows to the winding process for winding, and the rolls are ready for subsequent processes. Electrode coating is of great significance to the capacity, consistency, and safety of lithium batteries. However, a current challenge in coating is that during the autumn and winter seasons, the ambient temperature and humidity fluctuate greatly. When the external humidity is low, the dehumidifier in the workshop cannot quickly adjust the temperature and humidity. Before entering the oven, the negative electrode sheets in the workshop experience excessive moisture evaporation. Once in the oven, because the electrodes are too dry, the coating on the surface of the negative electrode sheets cracks and peels during further baking.

[0003] Currently, solving the problem of cracking, bulging, and detachment of negative electrode sheets typically requires: 1) Adjusting the oven temperature sequentially, starting with a low power level at the front and gradually increasing it. However, this method is time-consuming and slow to show results; 2) Using a spray gun to spray fine water mist onto the electrode sheets and surrounding environment to humidify the sheets and slow down evaporation. However, adjusting the oven temperature is slow, and abnormal drying can easily occur during adjustment. Manual humidification can also result in uneven drying. Utility Model Content

[0004] Based on this, in view of the technical problems of slow temperature adjustment of the oven and easy occurrence of drying abnormalities during adjustment, and unevenness of manual humidification, the present invention provides a lithium battery negative electrode humidification device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model first provides a humidification device for the negative electrode sheet of a lithium battery, which is used to humidify the negative electrode sheet. It includes a box, an atomizing plate and a fan. The box has an inlet and an outlet for the negative electrode sheet to pass through. Water is stored at the bottom of the box. The atomizing plate is installed at the bottom of the box and is used to form water mist from the water in the box. The fan is installed on the box and is used to blow air into the box.

[0007] This invention features an inlet and outlet on the chamber for the negative electrode sheet to pass through, and an atomizing plate to generate water mist. A fan blows air into the chamber to ensure the water mist is evenly distributed and circulated. The negative electrode sheet enters through the inlet and exits through the outlet before entering the oven, allowing for uniform humidification of the top and bottom surfaces. This ensures the electrode sheet is adequately moistened before entering the oven, eliminating the need for frequent temperature adjustments and manual spraying of water mist onto the negative electrode sheet. The invention is simple to operate, effectively solves the problem of electrode sheet cracking, and significantly reduces the risk of electrode sheet bulging and scrapping.

[0008] As a further improvement of the above-mentioned solution of this utility model, the box body is a stainless steel box body with a rectangular structure, and an inlet and an outlet are respectively opened on both sides of the length direction of the box body, and the inlet and outlet are located in the same horizontal plane.

[0009] As a further improvement to the above-mentioned solution of this utility model, the bottom of the box is recessed downward to form two recessed parts, and an atomizing plate is installed in each recessed part.

[0010] As a further improvement to the above-mentioned solution of this utility model, two fans are provided, which are respectively installed at both ends of the length direction of the box and the two fans are at different heights.

[0011] As a further improvement to the above-mentioned solution of this utility model, the top of the box is open and a top cover that is detachably connected to seal it is provided.

[0012] As a further improvement of the above-mentioned solution of this utility model, a water inlet hole for injecting water into the box is provided on the top cover, and a water inlet cap for sealing the water inlet hole can be detachably connected to it.

[0013] As a further improvement to the above-mentioned solution of this utility model, the lithium battery negative electrode humidification device also includes a hygrometer, which is installed in the box and used to display the humidity inside the box.

[0014] As a further improvement to the above-mentioned solution of this utility model, the lithium battery negative electrode humidification device also includes a water level gauge, which is installed on the box and used to display the water level inside the box.

[0015] As a further improvement to the above-mentioned solution of this utility model, the lithium battery negative electrode humidification device also includes a controller, which is electrically connected to the fan and the atomizing plate, and the controller is equipped with a power switch.

[0016] As a further improvement to the above-mentioned solution of this utility model, the controller is also provided with an atomization knob for adjusting the power of the atomizing plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention features an inlet and outlet on the chamber for the negative electrode sheet to pass through, and an atomizing plate to generate water mist. A fan blows air into the chamber to ensure the water mist is evenly distributed and circulated. The negative electrode sheet enters through the inlet and exits through the outlet before entering the oven, allowing for uniform humidification of the top and bottom surfaces. This ensures the electrode sheet is adequately moistened before entering the oven, eliminating the need for frequent temperature adjustments and manual spraying of water mist onto the negative electrode sheet. The invention is simple to operate, effectively solves the problem of electrode sheet cracking, and significantly reduces the risk of electrode sheet bulging and scrapping.

[0019] This invention allows for real-time monitoring of humidity inside the chamber by installing a hygrometer on the chamber body. This allows for adjustment of the power of the atomizing plate, thereby regulating the amount of atomization inside the chamber and ensuring that the humidification requirements of the negative electrode plate are met.

[0020] This invention features a water level gauge on the housing, allowing for real-time monitoring of the water level inside the housing. When the water level is insufficient, pure water can be added promptly to avoid affecting the humidification effect of the negative electrode plate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a lithium battery negative electrode humidification device according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Exploded view;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the atomizing plate.

[0024] Attached reference numerals: 1. Box body; 1-1. Inlet; 1-2. Recess; 2. Fan; 3. Atomizing plate; 4. Top cover; 4-1. Water inlet hole; 4-2. Water inlet cover; 5. Hygrometer; 6. Water level gauge; 7. Controller; 7-1. Power switch; 7-2. Atomizing knob; 8. Negative electrode plate. Detailed Implementation

[0025] To facilitate understanding of this invention, a more comprehensive description of the invention will be provided below with reference to specific embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] To address the technical problems of current methods for solving the cracking, bulging, and detachment of negative electrode sheets, such as slow oven temperature adjustment, susceptibility to drying abnormalities during adjustment, and uneven humidification in manual humidification, this embodiment provides a lithium battery negative electrode sheet humidification device. (Refer to...) Figure 1 , Figure 2 The humidification device for the negative electrode plate 8 of the lithium battery proposed in this embodiment includes a housing 1, an atomizing plate 3 and a fan 2, and may also include a controller 7, a hygrometer 5 and a water level gauge 6.

[0028] The housing 1 has an inlet 1-1 and an outlet for the negative electrode plate 8 to enter and exit. To avoid affecting the negative electrode plate 8, in this embodiment, the inlet 1-1 and the outlet are on the same horizontal plane to facilitate the smooth entry and exit of the negative electrode plate 8. In this embodiment, the housing 1 is made of stainless steel and has a rectangular structure with a wall thickness of 3mm. The housing 1 is filled with water. The inlet 1-1 and the outlet are respectively located at the middle of the two sides along the length of the housing 1. The length and width of the inlet 1-1 and the outlet are reasonably designed according to the width and thickness of the negative electrode plate 8. In this embodiment, the top of the housing 1 is open and a top cover 4 is snapped onto the top of the housing 1. Opening the top cover 4 facilitates the inspection and maintenance of the inside of the housing 1. Furthermore, the top cover 4 has a water inlet hole 4-1, and a water inlet cover 4-2 is detachably connected to the water inlet hole 4-1. When the water level in the housing 1 is insufficient, the water inlet cover 4-2 is opened, and water can be easily injected into the housing 1 through the water inlet hole 4-1. In this embodiment, the bottom of the housing 1 is recessed downwards to form two recessed portions 1-2, where the water level is deepest. In this embodiment, both the water inlet 4-1 and the water inlet cover 4-2 are circular. Of course, in other embodiments, as long as the humidification requirement is met, the housing 1 can be made of other materials, the number of recessed portions 1-2 can be one, three, or other quantities, and the water inlet 4-1 and the water inlet cover 4-2 can be other shapes, such as elliptical or square.

[0029] Atomizing plates 3 are installed at the bottom of the housing 1 to atomize the water inside the housing 1 into a water mist. When the negative electrode plate 8 passes through the housing 1, it can humidify the negative electrode plate 8. In this embodiment, to improve the humidification effect, two atomizing plates 3 are provided in each of the recesses 1-2 of the housing 1. The atomizing plates 3 are existing technology, and their structure is as follows... Figure 3 As shown, the function of the atomizing plate 3 is to generate high-frequency resonance (1.7MHz in this embodiment) after being energized, which can break up the molecular structure of liquid pure water to produce naturally drifting water mist.

[0030] Fan 2 is mounted on housing 1 and blows air into housing 1 to evenly disperse the water mist inside, thereby improving the humidification effect on the negative electrode plate 8. In this embodiment, two fans 2 are provided, located at opposite ends of the length of housing 1, with different heights. One fan 2 is positioned above inlet 1-1, while the other is positioned below inlet 1-1, which enhances the humidification effect on the negative electrode plate 8. Of course, in other embodiments, as long as the humidification effect on the negative electrode plate 8 is improved, the number of fans 2 can be one, three, or other quantities.

[0031] A hygrometer 5 is installed on the housing 1. The hygrometer 5 is used to detect the humidity inside the housing 1 and can display the humidity inside the housing 1 in real time. The power of the atomizing plate 3 can be adjusted based on the humidity detected by the hygrometer 5 so that the humidity inside the housing 1 meets the humidification requirements.

[0032] Water level gauge 6 is installed on the housing 1. Water level gauge 6 is used to detect the water level in the housing 1. Based on the water level information of water level gauge 6, water can be added to the housing 1 in time when the water level in the housing 1 is low, so as to ensure the humidification of the negative electrode plate 8.

[0033] The controller 7 is installed on the housing 1. The controller 7 is connected to an external power source via wires. The controller 7 is equipped with a power switch 7-1. Each atomizing plate 3, fan 2, and hygrometer 5 is connected to the power switch 7-1 via wires. The power switch 7-1 can control the power supply of each atomizing plate 3, fan 2, and hygrometer 5. The controller 7 is also equipped with an atomization knob 7-2 to adjust the power of each atomizing plate 3.

[0034] In this embodiment, the humidification device for the negative electrode plate 8 of the lithium battery is placed in front of the drying oven. First, the controller 7 is connected to the external power supply. The water inlet cover 4-2 is opened, and an appropriate amount of pure water is added into the chamber 1 through the water inlet hole 41. The water level in the chamber 1 is observed through the level gauge. The power switch 7-1 is turned on, and the atomizing plate 3, fan 2, and hygrometer 5 are all powered on. The atomizing plate 3 generates water mist, and the fan 2 blows air into the chamber 1 to disperse the water mist evenly. The hygrometer 5 displays the current humidity in the chamber 1. The electrode plate is inserted through the inlet 1-1 and exited through the outlet. According to the dryness of the negative electrode plate 8, the power of the atomizing plate 3 is adjusted through the atomizing knob 7-2, thereby adjusting the atomization amount and humidity value, so as to evenly humidify the upper and lower surfaces of the negative electrode plate 8.

[0035] The humidification device in this embodiment achieves precise control of the humidity of the negative electrode through closed-loop humidity control. By humidifying the electrode, it ensures that the electrode is fully moistened before entering the drying oven, eliminating the need for frequent adjustment of the drying oven temperature and manual spraying of water mist onto the negative electrode. The operation is simple, effectively solving the problem of electrode cracking and significantly reducing the risk of electrode bulging and scrapping.

[0036] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A lithium battery negative electrode sheet humidifying device for humidifying a negative electrode sheet (8), characterized by, It includes box (1), atomizing piece (3) and fan (2), the box (1) is provided with inlet (1-1) for the negative pole piece (8) to pass through, outlet, the bottom of the box (1) stores water; Atomizing piece (3) is installed in the bottom of the box (1) and is used to form water mist in the box (1); Fan (2) is installed on the box (1) and is used to blow wind to the box (1).

2. The lithium battery negative electrode sheet humidifying device according to claim 1, characterized in that, The box (1) is a stainless steel box (1) and is a cuboid structure, the inlet (1-1) and the outlet are provided on the length direction two sides of the box (1) and are located in the same horizontal plane. 3.The lithium battery negative electrode sheet humidifying device according to claim 1, characterized in that, The bottom of the box (1) is concave downward to form two recesses (1-2), and the atomizing piece (3) is installed in each recess (1-2).

4. The lithium battery negative electrode sheet humidifying device according to claim 2, characterized in that, Two fans (2) are provided, and the two fans (2) are installed at the length direction two ends of the box (1) and have different heights.

5. The lithium battery negative electrode sheet humidifying device according to claim 1, characterized in that, The top of the box (1) is open and detachably connected with the upper cover (4) for sealing.

6. The lithium battery negative electrode sheet humidifying device according to claim 5, characterized in that, The upper cover (4) is provided with the water inlet hole (4-1) for injecting water into the box (1), and the water inlet cover (4-2) is detachably connected with the water inlet hole (4-1) for sealing.

7. The lithium battery negative electrode web (8) humidifying device according to claim 1, characterized in that, The lithium battery negative pole piece (8) humidifying device further comprises a hygrometer (5), and the hygrometer (5) is installed on the box (1) and is used to display the humidity inside the box (1).

8. The lithium battery negative electrode sheet humidifying device according to claim 1, characterized in that, The lithium battery negative pole piece (8) humidifying device further comprises a water level gauge (6), and the water level gauge (6) is installed on the box (1) and is used to display the water level inside the box (1). 9.The lithium battery negative electrode sheet humidifying device according to claim 1, wherein, The lithium battery negative pole piece (8) humidifying device further comprises a controller (7), and the controller (7) is electrically connected with the fan (2) and the atomizing piece (3), and the controller (7) is provided with a power switch (7-1).

10. The lithium battery negative electrode sheet humidifying device according to claim 9, characterized in that, The controller (7) is further provided with an atomizing knob (7-2) for adjusting the power of the atomizing piece (3).

Images