A wet diaphragm tension isolation mechanism

Abstract

The present invention discloses a wet diaphragm tension isolation mechanism. The tension isolation device comprises a left fixed plate, a right fixed plate, a 1# roller, a 2# roller, a 3# roller, a 4# roller, a 1# coupling, a 2# coupling, a 3# coupling, a 4# coupling, a 1# motor, a 2# motor, a 3# motor, a 4# motor, a 1# bearing seat, a 2# bearing seat, a 3# bearing seat, a 4# bearing seat, and a diaphragm. The present invention can adjust the speed of each motor to match the changing diaphragm tension, and the device has a simple structure and low cost. The diaphragm forms a large wrap angle in the transmission path, thereby effectively realizing the tension isolation of the diaphragm.

Description

Technical Field

[0001] The present invention relates to the technical field of wet-process lithium battery diaphragm production, and in particular to a wet-process diaphragm tension isolation mechanism. Background Art

[0002] During the charge and discharge process of lithium-ion batteries, the diaphragm separates the positive and negative electrodes to prevent short circuits caused by contact between the two electrodes, absorbs sufficient electrolyte, provides sufficient electrolyte lithium ion channels, and has micropore self-closing protection functions. The lithium ion conductivity of the diaphragm is directly related to the overall performance of the lithium-ion battery. The performance of the diaphragm determines the battery's interface structure, electrolyte retention, and internal resistance, which in turn affects important characteristics of the battery, such as capacity, cycle performance, charge and discharge current density, and safety.

[0003] The existing wet-process diaphragm manufacturing method generally includes: batching casting → biaxial stretching → extraction → transverse stretching → winding inspection. Continuous production starts from batching casting until winding is completed. Each part has corresponding tension control. Since the diaphragm has different degrees of deformation during the manufacturing process, tension isolation is required.

[0004] In the prior art, one method is to use the compression force exerted by the weight of the compression roller to separate the tension in different transmission processes, but this device can only be applied to thick diaphragms and is not suitable for the production of ultra-thin diaphragms at this stage. Another method is to use a vacuum adsorption roller to separate the tension during the transmission of the diaphragm, but this roller is expensive and difficult to maintain, which is not conducive to the large-scale promotion and use of the diaphragm manufacturing industry. Summary of the invention

[0005] Therefore, in view of the above-mentioned deficiencies, the present invention proposes a wet diaphragm tension isolation mechanism, which can coordinate the changing diaphragm tension by adjusting the speed of each motor, and the device has a simple structure and low cost. The diaphragm will form a large wrap angle during the transmission process, thereby effectively realizing the tension isolation of the diaphragm.

[0006] The technical problem solved by the present invention can be realized by adopting the following technical solutions:

[0007] A wet diaphragm tension isolation mechanism, comprising a left fixed plate, a right fixed plate, a 1# roller, a 2# roller, a 3# roller, a 4# roller, a 1# coupling, a 2# coupling, a 3# coupling, a 4# coupling, a 1# motor, a 2# motor, a 3# motor, a 4# motor, a 1# bearing seat, a 2# bearing seat, a 3# bearing seat, a 4# bearing seat, and a diaphragm, wherein the 1# roller, the 2# roller, the 3# roller, and the 4# roller are respectively placed between the left fixed plate and the right fixed plate, the 1# roller is placed directly above the 2# roller, and the 2# roller and the 3# roller are placed on the left fixed plate and the right fixed plate. The rollers are placed in parallel, the 4# roller is placed directly above the 3# roller and parallel to the 1# roller, the 1# coupling, 2# coupling, 3# coupling, and 4# coupling are respectively installed on the left fixed plate, the 1# bearing seat, 2# bearing seat, 3# bearing seat, and 4# bearing seat are respectively installed on the right fixed plate, the 1# motor, 2# motor, 3# motor, and 4# motor are connected to the corresponding rollers through the corresponding couplings, and the diaphragm is transmitted through the 1# roller, 2# roller, 3# roller, and 4# roller in sequence.

[0008] Among them, there are visual windows in the middle of the left fixed plate and the right fixed plate.

[0009] Furthermore, the diameters of rollers 1#, 2#, 3# and 4# are the same, and the surfaces are all made of stainless steel and then subjected to ultra-mirror treatment after chrome electroplating, with a roughness Ra≤0.02μm.

[0010] Furthermore, the shortest distance between the 1# roller and the 2# roller is no more than 1 / 5 of the roller diameter, and the two rollers rotate in opposite directions. The shortest distance between the 2# roller and the 3# roller is no more than 1 / 5 of the roller diameter, and the two rollers rotate in the same direction. The shortest distance between the 3# roller and the 4# roller is no more than 1 / 5 of the roller diameter, and the two rollers rotate in opposite directions.

[0011] Furthermore, the 1# bearing seat, the 2# bearing seat, the 3# bearing seat and the 4# bearing seat are integral vertical bearing seats.

[0012] The 1# motor, 2# motor, 3# motor and 4# motor are all variable frequency motors controlled by PLC.

[0013] The beneficial effects of the present invention are as follows:

[0014] The invention discloses a wet-process diaphragm tension isolation mechanism, which adjusts the rotation speed of each motor to match the changing diaphragm tension, and the device has a simple structure and low cost. The diaphragm will form a large wrap angle in the transmission path, thereby effectively realizing the tension isolation of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the purpose, technical solution and beneficial effects of the implementation case of the present invention, the present invention provides the following drawings for illustration

[0016] Figure 1It is a schematic diagram of the structure of the present invention. In the figure: 1-left fixed plate, 2-right fixed plate, 3-1# roller, 4-2# roller, 5-3# roller, 6-4# roller, 7-1# coupling, 8-2# coupling, 9-3# coupling, 10-4# coupling, 11-1# motor, 12-2# motor, 13-3# motor, 14-4# motor, 15-1# bearing seat, 16-2# bearing seat, 17-3# bearing seat, 18-4# bearing seat, 19-diaphragm;

[0017] Figure 2 It is a schematic diagram of the diaphragm transmission of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 The figure shows a schematic diagram of a tension-breaking mechanism for wet-process diaphragm manufacturing of the present invention. The tension-breaking device for manufacturing wet-process diaphragm of the present embodiment comprises a left fixed plate 1, a right fixed plate 2, a 1# roller 3, a 2# roller 4, a 3# roller 5, a 4# roller 6, a 1# coupling 7, a 2# coupling 8, a 3# coupling 9, a 4# coupling 10, a 1# motor 11, a 2# motor 12, a 3# motor 13, a 4# motor 14, a 1# bearing seat 15, a 2# bearing seat 16, a 3# bearing seat 17, 4# bearing seat 18, diaphragm 19, the 1# roller 3, 2# roller 4, 3# roller 5, and 4# roller 6 are respectively placed between the left fixed plate 1 and the right fixed plate 2, the 1# roller 3 is placed directly above the 2# roller 4, the 2# roller 4 is placed parallel to the 3# roller 5, the 4# roller 6 is placed directly above the 3# roller 5 and parallel to the 1# roller 3, the 1# coupling 7, 2# coupling 8, 3# coupling 9, and 4# coupling 10 are respectively installed on the left fixed plate 1, the 1# bearing seat 15, 2# bearing seat 16, 3# bearing seat 17, and 4# bearing seat 18 are respectively installed on the right fixed plate 2, and the 1# motor 11, 2# motor 12, 3# motor 13, and 4# motor 14 are connected to the corresponding rollers through corresponding couplings.

[0020] There are visual windows in the middle of the left fixed plate 1 and the right fixed plate 2, so that the movement state of the diaphragm between the rollers can be observed.

[0021] 1# roller 3, 2# roller 4, 3# roller 5 and 4# roller 6 have the same diameter and are made of stainless steel on the surface. They are chrome-plated and then mirror-finished, with a roughness of Ra≤0.02μm, to ensure that the friction resistance of the diaphragm during transmission is small.

[0022] The shortest distance between the 1# roller 3 and the 2# roller 4 is no more than 1 / 5 of the roller diameter, and the two rollers rotate in opposite directions. The shortest distance between the 2# roller 4 and the 3# roller 5 is no more than 1 / 5 of the roller diameter, and the two rollers rotate in the same direction. The shortest distance between the 3# roller 5 and the 4# roller 6 is no more than 1 / 5 of the roller diameter, and the two rollers rotate in opposite directions.

[0023] 1# motor 11, 2# motor 12, 3# motor 13, and 4# motor 14 are all variable frequency motors controlled by PLC.

[0024] 1# bearing seat 15, 2# bearing seat 16, 3# bearing seat 17, and 4# bearing seat 18 all adopt integral vertical bearing seats.

[0025] The diaphragm 19 is conveyed through the 1# roller 3, the 2# roller 4, the 3# roller 5 and the 4# roller 6 in sequence, and an "Ω"-shaped large wrap angle path can be achieved to ensure the effect of tension separation.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wet diaphragm tension isolation mechanism, characterized in that: The invention comprises a left fixed plate (1), a right fixed plate (2), a 1# roller (3), a 2# roller (4), a 3# roller (5), a 4# roller (6), a 1# coupling (7), a 2# coupling (8), a 3# coupling (9), a 4# coupling (10), a 1# motor (11), a 2# motor (12), a 3# motor (13), a 4# motor (14), a 1# bearing seat (15), a 2# bearing seat (16), a 3# bearing seat (17), a 4# bearing seat (18), and a diaphragm (19). The 1# roller (3), the 2# roller (4), the 3# roller (5), and the 4# roller (6) are respectively placed between the left fixed plate (1) and the right fixed plate (2). The 1# roller (3) is placed directly above the 2# roller (4). The 2# roller (4) is placed parallel to the 3# roller (5). The 4# roller (6) is placed on the 3# roller (6). The 1# coupling (7), the 2# coupling (8), the 3# coupling (9), and the 4# coupling (10) are mounted on the left fixed plate (1); the 1# bearing seat (15), the 2# bearing seat (16), the 3# bearing seat (17), and the 4# bearing seat (18) are mounted on the right fixed plate (2); the 1# motor (11), the 2# motor (12), the 3# motor (13), and the 4# motor (14) are connected to the corresponding rollers through corresponding couplings respectively; the diaphragm (19) is transmitted through the 1# roller (3), the 2# roller (4), the 3# roller (5), and the 4# roller (6) in sequence; the 1# motor (11), the 2# motor (12), the 3# motor (13), and the 4# motor (14) are all variable frequency motors controlled by PLC; The shortest distance between the surfaces of the 1# roller (3) and the 2# roller (4) does not exceed 1 / 5 of the roller diameter, and the two rollers rotate in opposite directions; the shortest distance between the surfaces of the 2# roller (4) and the 3# roller (5) does not exceed 1 / 5 of the roller diameter, and the two rollers rotate in the same direction; the shortest distance between the surfaces of the 3# roller (5) and the 4# roller (6) does not exceed 1 / 5 of the roller diameter, and the two rollers rotate in opposite directions; The diameters of the 1# roller (3), 2# roller (4), 3# roller (5) and 4# roller (6) are the same, and the surface material of the rollers is stainless steel that has been electroplated with chrome and then subjected to ultra-mirror treatment, with a roughness Ra≤0.02 μm.

2. A wet diaphragm tension isolation mechanism as claimed in claim 1, characterized in that: The left fixing plate (1) and the right fixing plate (2) are both provided with visual windows in the middle.

3. A wet diaphragm tension isolation mechanism as claimed in claim 1, characterized in that: The 1# bearing seat (15), the 2# bearing seat (16), the 3# bearing seat (17), and the 4# bearing seat (18) are integral vertical bearing seats.

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