Secondary drying device for battery positive electrode slurry pulling

Abstract

The utility model relates to the technical field of battery production, and discloses a battery positive electrode slurry pulling secondary drying device which comprises a drying box, a sealing door is hinged to the front side of the drying box, an air pump is fixedly installed at the top of the drying box, four supporting assemblies are evenly arranged in the drying box in the vertical direction, and the air pump is fixedly installed at the bottom of the drying box. A drying assembly is further installed in the drying box. According to the secondary drying device, the defects in the prior art are overcome, when secondary drying is carried out on the battery positive electrode current collector subjected to slurry pulling, the environment around the current collector is pumped to be negative pressure through the sucking pump, and when the air pressure is lower than the standard atmospheric pressure, the boiling point of water can be lowered, so that water in slurry pulling can be dried and removed without a high temperature, and the drying efficiency is improved. Therefore, the positive electrode current collector of the battery is well protected and is prevented from being damaged due to high-temperature drying, in addition, each slurry pulling part of the current collector can be uniformly heated, and a certain part is prevented from intensively receiving excessive heat.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, and more specifically to a battery positive electrode slurry drawing and secondary drying device. Background Art

[0002] Slurrying the positive electrode current collector is a critical step in lithium-ion battery manufacturing. It involves coating the positive electrode material, a process that includes several sub-processes to ensure uniform distribution of the positive electrode material and battery performance. The positive electrode current collector for lithium-ion batteries is typically aluminum foil due to its excellent conductivity and reasonable cost. To ensure the stability of the current collector within the battery, the purity of the aluminum foil must be above 98%. The slurrying process involves precise control of the current collector size and strict requirements for the slurry weight. After the positive electrode is slurried, a series of steps are performed.

[0003] Deficiencies of the existing technology: Under the existing technology, after the battery positive electrode collector is slurried, it needs to be dried to remove the moisture in the slurry. Currently, the drying is generally divided into two steps. The first step is to dry it naturally, and the second step is to use heating equipment to deeply remove the moisture in the slurry. In the existing secondary drying process, although the heating equipment can effectively remove the moisture in the slurry, under the action of high temperature, the battery positive electrode collector itself is often unable to withstand the scorching, and is easily damaged and affects the performance. In addition, during the drying process, different parts of the collector are heated unevenly, which often leads to excessive local heating and affects the drying quality. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a battery positive electrode slurry secondary drying device to solve the problems existing in the above-mentioned background technology.

[0005] The utility model provides the following technical solution: a secondary drying device for battery positive electrode slurry drawing, comprising a drying box, a closed door hinged on the front side of the drying box, a vacuum pump fixedly installed on the top of the drying box, a support assembly installed inside the drying box, four support assemblies evenly arranged in the vertical direction, and a drying assembly also installed inside the drying box.

[0006] The support assembly includes a receiving frame, and each of the support assemblies includes two receiving frames. The receiving frames are fixedly connected to the inner wall of the drying box, and a support plate is slidably installed between the two receiving frames.

[0007] The drying component includes a moving rod, an electric heating plate is installed on the moving rod, and four electric heating plates are provided corresponding to the support components. A built-in groove is opened at the bottom of the inner cavity of the drying box, and the bottom end of the moving rod extends downward into the built-in groove. A motor and a sliding rod are installed in the built-in groove. The motor is used to pull the moving rod to move along the axial direction of the sliding rod.

[0008] Preferably, a guide pipe is provided on the right side of the drying box, the output end of the guide pipe is fixedly connected to the input end of the air extraction pump, four guide pipe input ends are provided, and the guide pipe input ends are fixedly connected to the drying box.

[0009] Preferably, an air pressure sensor is fixedly installed on the top of the inner cavity of the drying box, a control module is fixedly installed on the top of the drying box, the air pressure sensor and the control module are electrically connected, and the control module and the air pump are electrically connected.

[0010] Preferably, two supporting frames of the same supporting assembly are provided with strip grooves on one side close to each other, and guide bars are fixedly connected to the left and right sides of the supporting plate. The surface of the guide bar is slidably connected to the wall of the strip groove, and a pull-out opening is provided through the supporting plate.

[0011] Preferably, a connecting frame is fixedly connected to the movement rod, four connecting frames are provided corresponding to the electric heating plates, the electric heating plates are fixedly installed at the bottom of the connecting frame, the bottom end of the movement rod is fixedly connected to a fixing plate, and the motor is fixedly installed at the top of the fixing plate.

[0012] Preferably, a positioning frame is provided in the built-in groove, the bottom of the positioning frame is fixedly connected to the bottom of the built-in groove, a rack is fixedly installed on the top of the positioning frame, the output end of the motor is fixedly connected to a gear, and the gear is meshed with the rack.

[0013] Preferably, a T-shaped block is fixedly installed on the bottom of the fixed plate, both ends of the sliding rod are fixedly connected to the built-in groove wall, and the T-shaped block is sleeved on the surface of the sliding rod.

[0014] The technical effects and advantages of this utility model are:

[0015] The utility model solves the deficiencies of the prior art. When the positive electrode current collector of the battery is dried for the second time after slurry drawing, the environment around the current collector is pumped to a negative pressure through an air pump. When the air pressure is lower than the standard atmospheric pressure, the boiling point of water will also be lowered, so that the moisture in the slurry can be dried and removed without the need for a higher temperature, thereby playing a good protective role for the positive electrode current collector of the battery and avoiding damage due to high-temperature drying. In addition, during the drying process, the electric heating plate moves back and forth on the top of the current collector, so that all parts of the current collector slurry can be heated evenly, avoiding a certain part from receiving too much heat, thereby improving the drying effect and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 This is a schematic diagram of the top structure of the inner cavity of the drying box of the present invention.

[0018] Figure 3 This is a schematic diagram of the support assembly structure of the present utility model.

[0019] Figure 4 This is a partial structural diagram of the drying component of the present utility model.

[0020] Figure 5 This is a schematic diagram of the built-in groove structure of the utility model.

[0021] Figure 6 This is a partial structural diagram of the drying component of the present utility model.

[0022] The accompanying drawings are marked as follows: 1. Drying box; 11. Built-in groove; 2. Closed door; 3. Air pump; 31. Guide pipe; 32. Air pressure sensor; 33. Control module; 4. Support assembly; 41. Receiver; 42. Support plate; 43. Strip groove; 44. Guide bar; 45. Pull-out opening; 5. Drying assembly; 51. Moving rod; 511. Connecting frame; 512. Fixed plate; 52. Electric heating plate; 53. Rack; 54. Motor; 55. Gear; 56. T-block; 57. Sliding rod; 58. Positioning frame. DETAILED DESCRIPTION

[0023] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The battery positive electrode slurry drawing and secondary drying device involved in the present invention is not limited to the various structures described in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] The utility model provides a secondary drying device for battery positive electrode slurry drawing, comprising a drying box 1, a closed door 2 hinged on the front side of the drying box 1, an air pump 3 fixedly installed on the top of the drying box 1, a support assembly 4 installed inside the drying box 1, four support assemblies 4 are evenly arranged in the vertical direction, and a drying assembly 5 is also installed inside the drying box 1.

[0025] The support assembly 4 includes a receiving frame 41 , and each support assembly 4 includes two receiving frames 41 . The receiving frames 41 are fixedly connected to the inner wall of the drying box 1 , and a support plate 42 is slidably installed between the two receiving frames 41 .

[0026] The drying component 5 includes a moving rod 51, on which an electric heating plate 52 is installed. Four electric heating plates 52 are provided corresponding to the support component 4. A built-in groove 11 is provided at the bottom of the inner cavity of the drying box 1. The bottom end of the moving rod 51 extends downward into the built-in groove 11. A motor 54 and a sliding rod 57 are installed in the built-in groove 11. The motor 54 is used to pull the moving rod 51 to move along the axial direction of the sliding rod 57.

[0027] Furthermore, a guide pipe 31 is provided on the right side of the drying box 1, and the output end of the guide pipe 31 is fixedly connected to the input end of the vacuum pump 3. There are four input ends of the guide pipe 31, and the input end of the guide pipe 31 is fixedly connected to the drying box 1. The vacuum pump 3 can extract the air in the drying box 1 through the guide pipe 31.

[0028] Furthermore, an air pressure sensor 32 is fixedly installed on the top of the inner cavity of the drying box 1, and a control module 33 is fixedly installed on the top of the drying box 1. The air pressure sensor 32 and the control module 33 are electrically connected, and the control module 33 and the vacuum pump 3 are electrically connected. The air pressure sensor 32 can monitor the air pressure data inside the drying box 1 in real time, and the monitored results are transmitted to the control module 33 in the form of electrical signals. The control module 33 can analyze the electrical signals and issue corresponding instructions to the vacuum pump 3.

[0029] Furthermore, the two receiving frames 41 of the same supporting assembly 4 are each provided with a strip groove 43 on one side close to each other, and the left and right sides of the supporting plate 42 are fixedly connected with a guide bar 44, and the surface of the guide bar 44 is slidably connected to the groove wall of the strip groove 43, and a pull-out opening 45 is opened through the supporting plate 42. The supporting plate 42 is used to place the positive electrode current collector of the battery after slurry pulling. The staff can grab the pull-out opening 45 by hand to pull the support plate 42 out or insert it from between the two receiving frames 41, which is simple and convenient to operate.

[0030] Furthermore, the motion rod 51 is fixedly connected to a connecting frame 511, and four connecting frames 511 are provided corresponding to the electric heating plates 52. The electric heating plates 52 are fixedly installed at the bottom of the connecting frame 511. The bottom end of the motion rod 51 is fixedly connected to a fixing plate 512. The motor 54 is fixedly installed on the top of the fixing plate 512. A positioning frame 58 is provided in the built-in groove 11. The bottom of the positioning frame 58 is fixedly connected to the bottom of the built-in groove 11. A rack 53 is fixedly installed on the top of the positioning frame 58. The output end of the motor 54 is fixedly connected to a gear 55. The gear 55 is connected to the gear The bars 53 are meshed and connected, and a T-shaped block 56 is fixedly installed at the bottom of the fixed plate 512. Both ends of the sliding rod 57 are fixedly connected to the wall of the built-in groove 11. The T-shaped block 56 is sleeved on the surface of the sliding rod 57. The T-shaped block 56 and the sliding rod 57 form a sliding guide along the axial direction of the sliding rod 57. When the motor 54 drives the gear 55 to rotate around its own axis, due to the mutual meshing between the gear 55 and the rack 53, the gear 55 can move synchronously along the length direction of the rack 53 while rotating, and the T-shaped block 56 also slides synchronously along the sliding rod 57.

[0031] The working principle of the present invention is as follows: During actual operation, the staff pulls the support plate 42 out from between the two receiving frames 41 along the strip groove 43, places the battery positive electrode current collector after slurry pulling on the top of the support plate 42, and then pushes the support plate 42 between the two receiving frames 41 and closes the closed door 2.

[0032] The vacuum pump 3 is turned on and extracts the air in the drying box 1 through the guide pipe 31. During the vacuuming process, the air pressure sensor 32 monitors the air pressure data inside the drying box 1 in real time, and the monitored results are transmitted to the control module 33 in the form of electrical signals. The control module 33 analyzes the electrical signals. When the air pressure inside the drying box 1 reaches the required negative pressure value, the control module 33 sends a command to the vacuum pump 3 to control the vacuum pump 3 to shut down.

[0033] The motor 54 is turned on, and the motor 54 drives the gear 55 to rotate around its own axis. While the gear 55 rotates, it moves synchronously along the length direction of the rack 53. The motor 54, the fixed plate 512 and the T-block 56 also move synchronously as a whole. In the process of the T-block 56 sliding along the sliding rod 57, the connecting frame 511 installed on the moving rod 51 assists the electric heating plate 52 to move on the top of the collector. When the gear 55 moves from one end of the rack 53 to the other end of the rack 53, the motor 54 runs in the opposite direction. Similarly, the electric heating plate 52 returns to its initial position. This cycle repeats, and the electric heating plate 52 moves back and forth to complete the drying of the battery positive electrode collector after slurry pulling.

[0034] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0035] Secondly: The drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0036] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A secondary drying device for battery positive electrode slurry drawing, comprising a drying box (1), characterized in that: The front side of the drying box (1) is hinged with a closed door (2), the top of the drying box (1) is fixedly installed with an air pump (3), the interior of the drying box (1) is installed with a support assembly (4), and four support assemblies (4) are evenly arranged in the vertical direction. The interior of the drying box (1) is also installed with a drying assembly (5); The support assembly (4) includes a receiving frame (41), and each of the support assemblies (4) includes two receiving frames (41), the receiving frames (41) are fixedly connected to the inner wall of the drying box (1), and a support plate (42) is slidably installed between the two receiving frames (41); The drying assembly (5) comprises a motion rod (51), an electric heating plate (52) is mounted on the motion rod (51), four electric heating plates (52) are provided corresponding to the support assembly (4), a built-in groove (11) is provided at the bottom of the inner cavity of the drying box (1), the bottom end of the motion rod (51) extends downward into the built-in groove (11), a motor (54) and a sliding rod (57) are mounted in the built-in groove (11), and the motor (54) is used to pull the motion rod (51) to move along the axial direction of the sliding rod (57).

2. A battery positive electrode slurry secondary drying device according to claim 1, characterized in that: A guide tube (31) is provided on the right side of the drying box (1), and the output end of the guide tube (31) is fixedly connected to the input end of the air extraction pump (3). Four input ends of the guide tube (31) are provided, and the input end of the guide tube (31) is fixedly connected to the drying box (1).

3. The battery positive electrode slurry secondary drying device according to claim 1, characterized in that: An air pressure sensor (32) is fixedly mounted on the top of the inner cavity of the drying box (1), and a control module (33) is fixedly mounted on the top of the drying box (1). The air pressure sensor (32) and the control module (33) are electrically connected, and the control module (33) and the air pump (3) are electrically connected.

4. The battery positive electrode slurry secondary drying device according to claim 1, characterized in that: The two receiving frames (41) of the same supporting assembly (4) are both provided with a strip groove (43) on one side close to each other, and the left and right sides of the supporting plate (42) are both fixedly connected with guide bars (44), the surface of the guide bar (44) is slidably connected to the groove wall of the strip groove (43), and a drawing opening (45) is provided through the supporting plate (42).

5. The battery positive electrode slurry secondary drying device according to claim 1, characterized in that: The motion rod (51) is fixedly connected to a connecting frame (511), four connecting frames (511) are provided corresponding to the electric heating plates (52), the electric heating plates (52) are fixedly mounted on the bottom of the connecting frame (511), the bottom end of the motion rod (51) is fixedly connected to a fixing plate (512), and the motor (54) is fixedly mounted on the top of the fixing plate (512).

6. The battery positive electrode slurry secondary drying device according to claim 1, characterized in that: A positioning frame (58) is provided in the built-in groove (11), the bottom of the positioning frame (58) is fixedly connected to the bottom of the built-in groove (11), a rack (53) is fixedly installed on the top of the positioning frame (58), and a gear (55) is fixedly connected to the output end of the motor (54), and the gear (55) is meshed with the rack (53).

7. The battery positive electrode slurry secondary drying device according to claim 5, characterized in that: A T-shaped block (56) is fixedly installed on the bottom of the fixed plate (512), and both ends of the sliding rod (57) are fixedly connected to the groove wall of the built-in groove (11), and the T-shaped block (56) is sleeved on the surface of the sliding rod (57).

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