Pole piece drying device

Abstract

The utility model belongs to the technical field of pole piece production, and particularly relates to a pole piece drying device which comprises two power supply units, each power supply unit comprises a power supply module and a guide roller, the two ends of each guide roller are each provided with a conductive part making contact with the two ends, in the first direction, of a pole piece, and the power supply modules, the conductive parts and the pole pieces are communicated to form a first power supply loop; the two power supply units are respectively arranged on the two surfaces of the pole piece along the second direction and are respectively used for alternately supplying power to the two surfaces of the pole piece; the utility model provides a mode of drying the pole piece through Joule heat, the pole piece is alternately conducted through the two power supply units, and the directions of currents flowing through the pole piece by the two power supply units are opposite, so that a skin effect is formed, and the drying effect on the pole piece is improved.

Description

Technical Field

[0001] This utility model belongs to the field of electrode production technology, and in particular relates to an electrode drying device. Background Technology

[0002] During the battery manufacturing process, the electrodes need to be baked to remove as much moisture as possible.

[0003] Currently, the baking of electrode sheets is mainly completed in two stages: one stage is baking the electrode sheets after coating, and the other stage is baking the electrode sheets after the battery cell is formed and installed in the casing. Both baking stages are to remove moisture from the electrode sheets to the maximum extent.

[0004] Currently, due to the increasing performance requirements of batteries, the compaction density of electrode sheets is also constantly increasing. The increase in compaction density will affect the discharge of moisture from the electrode sheets during baking, thereby affecting the production quality of batteries. Utility Model Content

[0005] The purpose of this invention is to provide an electrode drying device to address the aforementioned technical problems.

[0006] In view of this, the present invention provides an electrode drying device, wherein the electrode includes an empty foil area and a coating area, and the drying device includes:

[0007] Two power supply units, each power supply unit includes a power supply module and a guide roller electrically connected to the power supply module. Each end of the guide roller is provided with a conductive part that contacts the empty foil area at both ends of the electrode sheet along the first direction. The conductive part is intermittently electrically connected to the empty foil area.

[0008] Two power supply units are respectively located on both sides of the electrode sheet along the second direction, and when one power supply unit is electrically connected to the empty foil area of ​​the electrode sheet, the other power supply unit is not conductive to the empty foil area of ​​the electrode sheet.

[0009] The current flowing through the electrodes in the two power supply units is in opposite directions.

[0010] Furthermore, the guide roller also includes:

[0011] An insulating portion, with two conductive portions disposed at both ends of the insulating portion along a first direction.

[0012] Furthermore, the conductive part includes:

[0013] Conductive shafts are disposed at both ends of the insulating portion along the first direction;

[0014] Conductive terminals are disposed on the periphery of the conductive shaft.

[0015] Furthermore, the radial radius of the conductive shaft is smaller than the radial radius of the insulating part.

[0016] Furthermore, the radial end of the conductive terminal along the conductive axis is flush with the periphery of the insulating part.

[0017] Furthermore, the number of conductive terminals is several.

[0018] Furthermore, several conductive terminals are arranged in a ring array along the circumference of the conductive shaft.

[0019] Furthermore, the conductive part also includes:

[0020] An insulating cover is fitted onto a conductive shaft, and the insulating cover has several conductive openings.

[0021] Several conductive terminals extend out of the insulating cover through conductive ports.

[0022] Furthermore, it also includes an electric slip ring module, through which the power supply module is rotatably connected to the conductive shaft.

[0023] Furthermore, the power supply module is a DC power supply.

[0024] One of the above technical solutions has the following beneficial effects:

[0025] By setting conductive parts in the empty foil area of ​​the electrode, the electrode is energized to generate Joule heat. This heat is transferred from the current collector side of the electrode to the active material side coated on the current collector, realizing a drying method from the inside out, which can meet the requirements of moisture removal from the electrode under high pressure density.

[0026] Furthermore, by alternately outputting opposite currents to the electrode surface through two power supply units, the conductive environment of alternating current is simulated, which increases the resistance of the current collector due to the skin effect of the electrode, thereby increasing the heat generation of Joule heating per unit time and further improving the drying effect of the electrode. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the guide roller of this utility model;

[0029] Figure 3 This is a structural schematic diagram of the present invention from a certain perspective;

[0030] Figure 4 This is a schematic diagram of the structure of the guide roller of this utility model when it is used as a traction roller;

[0031] The markings in the diagram are as follows:

[0032] 1. Power supply module; 2. Guide roller; 3. Conductive part; 31. Conductive shaft; 32. Conductive terminal; 33. Insulating cover; 34. Conductive port; 4. Insulating part; 5. Empty foil area; 6. Coating area; Y, first direction; Z, second direction. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] To address the problem of difficulty in removing moisture from electrodes due to high compaction pressure, this drying device can be used independently as an electrode drying unit in the electrode production process, or as a supplementary step after the conventional electrode baking process.

[0036] The electrode can be either a positive electrode or a negative electrode. The electrode consists of a current collector and an active material coated on the current collector. The area of ​​the current collector that is not coated with active material is called the empty foil area, and the area coated with active material is called the coated area.

[0037] Example 1:

[0038] This embodiment provides an electrode drying apparatus. The electrode includes an empty foil region 5 and a coating region 6. The drying apparatus includes:

[0039] Two power supply units are provided. Each power supply unit includes a power supply module 1 and a guide roller 2 electrically connected to the power supply module 1. Each end of the guide roller 2 is provided with a conductive part 3 that contacts the empty foil area 5 at both ends of the electrode sheet along the first direction Y. The conductive part 3 is intermittently electrically connected to the empty foil area 5.

[0040] Among them, the guide roller 2 in the power supply unit can be the guide roller or pressure roller on the electrode production line;

[0041] The two ends of the guide roller 2 are generally rotatably mounted on the frame of the electrode production equipment, and rotate by external power or driven by the electrode. The external power is mostly achieved by the cooperation of motor and transmission mechanism. The above is a commonly used solution in the existing technology, and will not be elaborated here.

[0042] Two power supply units are respectively located on both sides of the electrode sheet along the second direction Z, and when one power supply unit is electrically connected to the empty foil area 5 of the electrode sheet, the other power supply unit is not conductive to the empty foil area 5 of the electrode sheet.

[0043] The current flowing through the electrodes in the two power supply units is in opposite directions.

[0044] In this technical solution, the electrode wire passes between two guide rollers 2, and the empty foil areas 5 on both sides of the electrode along the second direction Z intermittently make electrical contact with the conductive parts 3 of the two guide rollers 2. Specifically, when the conductive parts 3 on both ends of one guide roller 2 are in contact with the empty foil area 5 on one side of the electrode, the conductive parts 3 on the other guide roller 2 are not in contact with the empty foil area 5 on the other side of the electrode. The power supply module 1, which is electrically connected to the guide roller 2 in contact with the electrode, outputs a release current. The current flows through the conductive parts 3 from the surface of the electrode, energizing the electrode surface. Due to Joule's law, the electrode generates heat, achieving baking of the interior of the electrode and expelling moisture from it.

[0045] By setting a conductive part 3 in the empty foil area 2 of the electrode, the electrode is energized to generate Joule heat. This heat is transferred from the current collector side of the electrode to the active material side coated on the current collector, realizing a drying method from the inside out, which can meet the requirements of moisture removal from the electrode under high pressure density.

[0046] Furthermore, by alternately outputting opposite currents to the electrode surface through two power supply units, the conductive environment of alternating current is simulated, which increases the resistance of the current collector due to the skin effect of the electrode, thereby increasing the heat generation of Joule heating per unit time and further improving the drying effect of the electrode.

[0047] Example 2:

[0048] This embodiment provides an electrode drying apparatus, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0049] Furthermore, guide roller 2 also includes:

[0050] An insulating part 4 and two conductive parts 3 are disposed at both ends of the insulating part 4 along the first direction Y.

[0051] In this technical solution, the guide roller 2 is composed of a roller body and a roller shaft. The roller shaft is set at both ends of the roller body for the installation and connection of the guide roller 2. The roller body is composed of an insulating part 4 and two conductive parts 3. The insulating part 4 is located in the middle of the roller body, and the two conductive parts 3 are located at both ends of the roller body in the axial direction.

[0052] Through this structural design, the insulating part 4 in the middle of the roller body can contact the coating area 6 of the electrode sheet, and play an auxiliary traction role in the electrode sheet conveying. Thus, the device can be applied to the traction stage after coating operation, that is, the guide roller 2 can be used as a traction roller. The insulating part 4 in the middle of the roller body can also play a rolling pressing role on the electrode sheet, so that the guide roller 2 can be used as a pressure roller in the rolling pressing operation.

[0053] Example 3:

[0054] This embodiment provides an electrode drying apparatus, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0055] Furthermore, the conductive part 3 includes:

[0056] Conductive shaft 31 is disposed at both ends of insulating part 4 along the first direction Y;

[0057] The conductive terminal 32 is mounted on the periphery of the conductive shaft 31.

[0058] In this technical solution, the specific structure of the conductive part 3 consists of a conductive shaft 31 and a conductive terminal 32. The conductive shaft 31 is fixedly mounted on the end of the insulating part 4, and the conductive terminal 32 is mounted on the conductive shaft 31 and protrudes radially from the conductive shaft 31. Through this structural design, the conductive terminal 32 on the guide roller 2 can indirectly contact the electrode as the guide roller 2 rotates, so as to realize the intermittent energization of the electrode. The two guide rollers 2 alternately contact the electrode, so as to realize the change of the current direction on the surface of the electrode.

[0059] Furthermore, the radial radius of the conductive shaft 31 is smaller than the radial radius of the insulating part 4. This structural design ensures that the electrode does not come into contact with the conductive shaft 31 when passing through the two guide rollers 2, preventing the electrode from being constantly energized and effectively preventing the electrode from being affected by intermittent energization.

[0060] Furthermore, the radial end of the conductive terminal 32 along the conductive shaft 31 is flush with the periphery of the insulating portion 4. This structural design ensures that the conductive terminal 32 does not protrude from the insulating portion 4, thus preventing the conductive terminal 32 from scratching the electrode and causing damage to the electrode.

[0061] Example 4:

[0062] This embodiment provides an electrode drying apparatus, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0063] Furthermore, the number of conductive terminals 32 is several.

[0064] In this technical solution, by setting multiple conductive terminals 32, the number of times the electrode is energized per rotation of the guide roller 2 increases, thereby effectively enhancing the baking effect and improving production efficiency.

[0065] Furthermore, several conductive terminals 32 are arranged in a ring array around the conductive shaft 31. This structural design enables intermittent and regular current conduction on the electrode, making the heat generation of the electrode more stable and balanced, and effectively ensuring that moisture can be discharged from all parts of the electrode.

[0066] Example 5:

[0067] This embodiment provides an electrode drying apparatus, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0068] Furthermore, the conductive part 3 also includes:

[0069] An insulating cover 33 is sleeved on a conductive shaft 31, and the insulating cover 33 has several conductive openings 34.

[0070] Among them, several conductive terminals 32 extend out of the insulating cover 33 through conductive ports 34.

[0071] In this technical solution, the insulating cover 33 is made of insulating material. By setting the insulating sleeve on the conductive shaft 31 and allowing the conductive terminal 32 to extend through the conductive port 34 on the insulating cover 33, it is possible to prevent the electrode from contacting the conductive shaft 31 due to shaking, folding, etc., thereby further enhancing the protection effect and preventing the intermittent energization of the electrode from being affected.

[0072] Example 6:

[0073] This embodiment provides an electrode drying apparatus, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0074] Furthermore, it also includes an electric slip ring module, and the power supply module 1 is rotatably connected to the conductive shaft 31 through the electric slip ring module.

[0075] In this technical solution, the electric slip ring module is an existing technology consisting of components such as slip rings and brushes. The conductive shaft 31 is connected to the power supply module 1 through the electric slip ring module to prevent the guide roller 2 from rotating with the wire and causing the wire to become entangled.

[0076] Example 7:

[0077] This embodiment provides an electrode drying apparatus, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0078] Furthermore, power supply module 1 is a DC power supply.

[0079] In this technical solution, the power supply module 1 can be a DC power source, such as a dry cell battery, a storage battery, a DC generator, etc. As shown in the figure, by alternately contacting the conductive terminals 32 of the two guide rollers 2 on both sides of the electrode with the electrode, and by having the two DC power sources output opposite DC currents respectively, the effect of AC current passing through the electrode is achieved, thereby satisfying the skin effect.

[0080] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An electrode drying apparatus, wherein the electrode comprises an empty foil region (5) and a coating region (6), characterized in that, The drying device includes: Two power supply units, each power supply unit includes a power supply module (1) and a guide roller (2) electrically connected to the power supply module (1). Each end of the guide roller (2) is provided with a conductive part (3) that contacts the empty foil area (5) at both ends of the electrode along the first direction (Y). The conductive part (3) is intermittently electrically connected to the empty foil area (5). The two power supply units are respectively disposed on both sides of the electrode along the second direction (Z), and when one of the power supply units is electrically connected to the empty foil area (5) of the electrode, the other power supply unit is not conductive to the empty foil area (5) of the electrode. The current flowing through the electrodes in the two power supply units is in opposite directions.

2. The electrode drying apparatus according to claim 1, characterized in that, The guide roller (2) also includes: An insulating portion (4) and two conductive portions (3) are disposed at both ends of the insulating portion (4) along the first direction (Y).

3. The electrode drying apparatus according to claim 2, characterized in that, The conductive part (3) includes: Conductive shaft (31), the conductive shaft (31) is disposed at both ends of the insulating part (4) along the first direction (Y); A conductive terminal (32) is disposed on the periphery of the conductive shaft (31).

4. The electrode drying apparatus according to claim 3, characterized in that, The radial radius of the conductive shaft (31) is smaller than the radial radius of the insulating part (4).

5. The electrode drying apparatus according to claim 4, characterized in that, The end of the conductive terminal (32) along the radial direction of the conductive shaft (31) is flush with the periphery of the insulating part (4).

6. The electrode drying apparatus according to claim 3, characterized in that, The number of conductive terminals (32) is several.

7. The electrode drying apparatus according to claim 6, characterized in that, A plurality of the conductive terminals (32) are arranged in a ring array around the conductive axis (31).

8. The electrode drying apparatus according to claim 6, characterized in that, The conductive part (3) further includes: An insulating cover (33) is sleeved on a conductive shaft (31), and a plurality of conductive openings (34) are provided on the insulating cover (33). Among them, several of the conductive terminals (32) are provided to extend out of the insulating cover (33) through conductive ports (34).

9. The electrode drying apparatus according to claim 1, characterized in that, It also includes an electric slip ring module, wherein the power supply module (1) is rotatably connected to the conductive shaft (31) through the electric slip ring module.

10. The electrode drying apparatus according to claim 1, characterized in that, The power supply module (1) is a DC power supply.

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