Pole piece production device

Abstract

The utility model belongs to the technical field of battery production, and particularly relates to a pole piece production device which comprises an electromagnetic heating mechanism, a pole lug extension mechanism, a roller mechanism and a laser thickness measuring mechanism, and the pole lug extension mechanism comprises a first tension control roller and a second tension control roller which are oppositely arranged; the roller mechanism comprises a clockwise roller and an anticlockwise roller which are oppositely arranged. According to the utility model, moisture in the pole piece can be effectively removed, a lug is prevented from wrinkling, the compaction density of the pole piece is improved, and the energy density of a battery cell is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production, and particularly relates to a pole piece production device. Background Art

[0002] With the development of battery technology, lithium-ion batteries are increasingly used. In addition, the electrodes in existing lithium-ion batteries are generally produced using a wet process. In traditional electrode production, N-methyl-2-pyrrolidone (NMP) is widely used as a mixed solvent. However, NMP is toxic and does not meet the requirements of sustainable development. If dry processes are used instead, the existing dry process has low production efficiency and the tabs are prone to wrinkling, making efficient electrode production impossible. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of the existing technology and provide a pole piece production device with strong controllability, which can effectively remove moisture from the pole piece, prevent the pole ear from wrinkling, increase the compaction density of the pole piece, and enhance the energy density of the battery cell.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A pole piece production device includes an electromagnetic heating mechanism, a pole tab extension mechanism, a rolling mechanism, and a laser thickness measuring mechanism arranged in sequence. The pole tab extension mechanism includes a first tension control roller and a second tension control roller arranged oppositely. The rolling mechanism includes a clockwise roller and a counterclockwise roller arranged oppositely.

[0006] As an improvement of the pole piece production device of the present invention, the pole tab extension mechanism and the rolling mechanism form a wrinkle removal and compaction unit, and there are at least two wrinkle removal and compaction units between the electromagnetic heating mechanism and the laser thickness measuring mechanism.

[0007] As an improvement of the pole piece production device of the present invention, the electromagnetic heating mechanism is arranged between the unwinding mechanism and the pole tab extending mechanism, and the laser thickness measuring mechanism is arranged between the rolling mechanism and the winding mechanism.

[0008] As an improvement to the electrode production device of the present invention, a preheating mechanism is provided between the unwinding mechanism and the electromagnetic heating mechanism, and the preheating mechanism can preheat the electrode by electromagnetic heating.

[0009] As an improvement to the electrode production device of the present invention, the electromagnetic heating mechanism is arranged between the surface density detection mechanism and the electrode tab extension mechanism.

[0010] As an improvement of the electrode production device of the present invention, the surface density detection mechanism is arranged between the feeding and conveying mechanism and the electromagnetic heating mechanism, and the surface density detection mechanism is used to perform surface density detection on the electrode after dressing.

[0011] As an improvement to the electrode production device of the present invention, the electromagnetic heating mechanism, the electrode tab extension mechanism, the rolling mechanism, the laser thickness measuring mechanism, the surface density detection mechanism and the feeding and conveying mechanism are all electrically connected to a controller, and the controller is used to input electronic control instructions to each mechanism to control the orderly operation of each mechanism.

[0012] As an improvement of the electrode production device of the present invention, the feeding and conveying mechanism includes a first roller conveying module and a second roller conveying module arranged relatively along the electrode conveying direction, the first roller conveying module is used to coat the front of the electrode, and the second roller conveying module is used to coat the back of the electrode.

[0013] As an improvement to the electrode production device of the present invention, the first roller conveying module and the second roller conveying module respectively have at least two conveying transfer rollers arranged in parallel and turning in opposite directions. The conveying transfer rollers turning in opposite directions can speed up the conveyance of materials.

[0014] As an improvement to the electrode production device of the present invention, the first roller conveying module and the second roller conveying module respectively have a feeding unit.

[0015] The beneficial effects of the present invention are as follows: the present invention includes an electromagnetic heating mechanism, a tab extension mechanism, a rolling mechanism and a laser thickness measuring mechanism which are arranged in sequence. When processing the pole piece, the pole piece is passed through the electromagnetic heating mechanism, the tab extension mechanism, the rolling mechanism and the laser thickness measuring mechanism in sequence. The electromagnetic heating mechanism can dry the moisture in the pole piece by means of heating. The tab extension mechanism includes a first tension control roller and a second tension control roller which are arranged relatively. The pole piece can pass through the first tension control roller and the second tension control roller so that it can be extended in the relative stretching of the first tension control roller and the second tension control roller. The rolling mechanism includes a clockwise roller and a counterclockwise roller which are arranged relatively. The clockwise roller and the counterclockwise roller can relatively roll the surface of the pole piece, thereby ensuring that the pole piece has a higher compaction density. The laser thickness measuring mechanism can detect the thickness of the pole piece after rolling, thereby ensuring that the formed pole piece has a higher production and processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 It is a structural schematic diagram of the tab extension mechanism of the present invention.

[0018] Among them: 1. Electromagnetic heating mechanism; 2. Tab extension mechanism; 21. First tension control roller; 22. Second tension control roller; 3. Roller mechanism; 4. Laser thickness measuring mechanism; 5. Unwinding mechanism; 6. Rewinding mechanism; 7. Preheating mechanism; 8. Surface density detection mechanism; 9. Controller; 11. First rotating roller transmission module; 12. Second rotating roller transmission module; 13. Transmission transfer roller; 14. Feeding unit; 15. First steel roller; 16. Second steel roller. DETAILED DESCRIPTION

[0019] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in name as a way to distinguish components, but rather use differences in the functions of the components as the criteria for distinction. For example, the term "including" mentioned throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0020] In this utility model, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean fixed connection, detachable connection, or integral connection; it can mean mechanical connection, direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0021] The existing dry electrode technology breaks the limitations of traditional slurry and coating technologies. Its biggest feature is that it eliminates solvent slurry. In addition, the coating eliminates traditional extrusion coating and high-energy consumption multi-section oven baking equipment. It has huge advantages in reducing equipment investment and energy consumption costs in the two core processes of slurry and coating. At present, the commonly used dry electrode preparation technologies include adhesive fibrillation method, electrostatic spraying method, etc. However, the inventors found that the existing adhesive fibrillation method electrode processing generally requires additional rolling equipment for processing, etc., so it is very necessary to provide a new type of electrode sheet production device.

[0022] The following is combined with Figures 1-2 The present invention is further described in detail with reference to the following specific embodiments, but is not intended to limit the present invention.

[0023] A pole piece production device, see Figure 1 and Figure 2, an electromagnetic heating mechanism 1, a tab extension mechanism 2, a rolling mechanism 3, and a laser thickness measuring mechanism 4 are arranged in sequence, the tab extension mechanism 2 includes a first tension control roller 21 and a second tension control roller 22 arranged relatively, and the rolling mechanism 3 includes a clockwise roller and a counterclockwise roller arranged relatively, wherein, when processing the pole piece, the pole piece is made to pass through the electromagnetic heating mechanism 1, the tab extension mechanism 2, the rolling mechanism 3 and the laser thickness measuring mechanism 4 in sequence, the electromagnetic heating mechanism 1 can dry the moisture in the pole piece by means of heating, and then the tab can pass through the first tension control roller 21 and the second tension control roller 22 so that it can be extended in the relative stretching of the first tension control roller 21 and the second tension control roller 22, the clockwise roller and the counterclockwise roller can relatively roll the surface of the pole piece, ensuring that the pole piece has a higher compaction density, the laser thickness measuring mechanism 4 can detect the thickness of the pole piece after rolling, ensuring that the formed pole piece has a higher production and processing quality.

[0024] Preferably, in order to make the rolling of the electrode sheet safer and prevent the occurrence of belt breakage, the rolling process of the electrode sheet can be performed multiple times with small amplitudes, so that the tab extension mechanism 2 and the rolling mechanism 3 form a wrinkle removal and compaction unit, and at least two wrinkle removal and compaction units can be provided between the electromagnetic heating mechanism 1 and the laser thickness measurement mechanism 4. In addition, a first steel roller 15 can be provided between the electromagnetic heating mechanism 1 and the tab extension mechanism 2 to effectively improve the stability of the electrode sheet transmission and prevent the occurrence of belt breakage.

[0025] Preferably, the electromagnetic heating mechanism 1 is arranged between the unwinding mechanism 5 and the tab extending mechanism 2 , and the laser thickness measuring mechanism 4 is arranged between the rolling mechanism 3 and the winding mechanism 6 .

[0026] Preferably, a preheating mechanism 7 is provided between the unwinding mechanism 5 and the electromagnetic heating mechanism 1. The preheating mechanism 7 can be an electromagnetic heating component with a power lower than that of the electromagnetic heating mechanism 1. Before the electrode is unwound for coating, the preheating mechanism 7 can use electromagnetic heating to preheat the electrode to the required temperature to ensure that the coating of the electrode is more efficiently and comprehensively adhered to the surface of the electrode.

[0027] Preferably, the surface density detection mechanism 8 is arranged between the feeding and conveying mechanism and the electromagnetic heating mechanism 1, the electromagnetic heating mechanism 1 is arranged between the surface density detection mechanism 8 and the pole piece extension mechanism 2, and the unwinding mechanism 5, the preheating mechanism 7, the second steel roller 16, the feeding and conveying mechanism, the surface density detection mechanism 8 and the electromagnetic heating mechanism 1 are arranged in sequence along the tape transmission direction of the pole piece.

[0028] Among them, the surface density detection mechanism 8 can be an X-ray surface density detection mechanism or a β-ray surface density detection mechanism. After the feeding and conveying mechanism feeds the material to the electrode, the surface density detection mechanism 8 can effectively detect the surface density of the electrode to ensure that the electrode is loaded intact.

[0029] Preferably, the electromagnetic heating mechanism 1, the tab extension mechanism 2, the rolling mechanism 3, the laser thickness measuring mechanism 4, the surface density detection mechanism 8 and the feeding and conveying mechanism are all electrically connected to the controller 9, wherein the controller 9 can be a PLC controller or an MCU processor, and the controller 9 can control the normal operation of the electromagnetic heating mechanism 1, the tab extension mechanism 2, the rolling mechanism 3, the laser thickness measuring mechanism 4, the surface density detection mechanism 8 and the feeding and conveying mechanism.

[0030] Preferably, the feeding and conveying mechanism includes a first roller conveying module 11 and a second roller conveying module 12, which are arranged opposite each other along the electrode conveying direction. The first roller conveying module 11 and the second roller conveying module 12 can be arranged symmetrically. The first roller conveying module 11 and the second roller conveying module 12 each have at least two conveying transfer rollers 13 arranged in parallel and rotating in opposite directions.

[0031] In order to adjust the efficiency of material conveying, the first roller conveying module 11 and the second roller conveying module 12 may respectively have 4 to 6 conveying transfer rollers 13 .

[0032] Preferably, the first roller conveying module 11 and the second roller conveying module 12 each have a feeding unit 14 , and the feeding unit 14 can be disposed between two adjacent conveying transfer rollers 13 .

[0033] Obviously, the device of the present invention has a high degree of integration, perfect process, high production efficiency and strong versatility, which ensures that the formed pole pieces have high production and processing quality.

[0034] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present utility model fall within the scope of protection of the present utility model. In addition, although certain specific terms are used in this description, these terms are for convenience only and do not constitute any limitation on the present utility model.

Claims

1. A pole piece production device, characterized in that: include: An electromagnetic heating mechanism (1), a tab extension mechanism (2), a roller mechanism (3), and a laser thickness measuring mechanism (4) are sequentially arranged; The tab extension mechanism (2) comprises a first tension control roller (21) and a second tension control roller (22) which are arranged opposite to each other; The roller mechanism (3) comprises a clockwise roller and a counterclockwise roller which are arranged opposite to each other.

2. The electrode production device according to claim 1, characterized in that: The tab extension mechanism (2) and the roller mechanism (3) form a wrinkle removal and compaction unit, and at least two wrinkle removal and compaction units are provided between the electromagnetic heating mechanism (1) and the laser thickness measurement mechanism (4).

3. The electrode production device according to claim 1 or 2, characterized in that: The electromagnetic heating mechanism (1) is arranged between the unwinding mechanism (5) and the tab extending mechanism (2), and the laser thickness measuring mechanism (4) is arranged between the rolling mechanism (3) and the winding mechanism (6).

4. The electrode production device according to claim 3, characterized in that: A preheating mechanism (7) is provided between the unwinding mechanism (5) and the electromagnetic heating mechanism (1).

5. The electrode production device according to claim 1 or 2, characterized in that: The electromagnetic heating mechanism (1) is arranged between the surface density detection mechanism (8) and the tab extension mechanism (2).

6. The electrode production device according to claim 5, characterized in that: The surface density detection mechanism (8) is arranged between the feeding and conveying mechanism and the electromagnetic heating mechanism (1).

7. The electrode production device according to claim 6, characterized in that: The electromagnetic heating mechanism (1), the tab extension mechanism (2), the roller mechanism (3), the laser thickness measurement mechanism (4), the surface density detection mechanism (8) and the feeding and conveying mechanism are all electrically connected to a controller (9).

8. The electrode production device according to claim 6, characterized in that: The feeding and conveying mechanism comprises a first roller conveying module (11) and a second roller conveying module (12) which are arranged opposite to each other along the pole piece conveying direction.

9. The electrode production device according to claim 8, characterized in that: The first rotating roller conveying module (11) and the second rotating roller conveying module (12) respectively have at least two conveying transfer rollers (13) arranged in parallel and rotating in opposite directions.

10. The electrode production device according to claim 8, characterized in that: The first roller conveying module (11) and the second roller conveying module (12) respectively have a feeding unit (14).

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