Pole piece production equipment and pole piece production process method

Abstract

The invention relates to the technical field of battery production, and discloses pole piece production equipment and a pole piece production process method, and the pole piece production equipment is suitable for processing a continuously moving current collector; the pole piece production equipment comprises a first coating head and a second coating head, wherein the first coating head is suitable for coating a current collector with first slurry; the first drying oven is arranged at the downstream of the first coating head and is suitable for drying the current collector coated with the first slurry; the second coating head is arranged at the downstream of the first drying oven and is suitable for coating the current collector with second slurry, and the second slurry is located on at least one side of the first slurry in the width direction of the current collector; and the second drying oven is arranged at the downstream of the second coating head and is suitable for drying the current collector coated with the first slurry and the second slurry. According to the pole piece production equipment provided by the invention, the conditions of permeation and material mixing on the edges of the ceramic slurry and the positive active material slurry when the ceramic slurry and the positive active material slurry are in a fluid state before drying can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and in particular to a pole piece production device and a pole piece production process method. Background Art

[0002] In order to improve the safety of lithium-ion batteries, an insulating coating of a certain width is usually set on the edge of the tab of the positive electrode. The method adopted in the relevant technology is generally: during the coating process of the positive electrode, the insulating coating slurry is directly extruded from the die head together with the positive electrode active material slurry, and the product is obtained after drying in an oven.

[0003] However, in this process, since both the insulating coating slurry and the positive electrode active material slurry are in a fluid state before drying, the edges of the two are prone to penetration and material leakage, which leads to abnormalities such as virtual edges and bulging at the junction after drying, which brings difficulties to the subsequent processing of the pole piece and the edge grasping of the visual system. In addition, due to the large difference in the drying speed of the insulating coating slurry and the positive electrode active material slurry, simultaneous drying can easily lead to problems such as cracking of the positive electrode piece and sticking to the coating roller, which increases the difficulty of the debugging process. On this basis, in order to achieve qualified insulating edge coating, the relevant technology must not only conduct a systematic study on material types, slurry characteristics, wind temperature systems, etc., but also prepare multiple sets of coating gaskets of different specifications. The overall debugging is difficult, the debugging time is long, and there are many debugging scraps. Summary of the invention

[0004] In view of this, the present invention provides a pole piece production equipment and a pole piece production process method to solve the problem that the edges of the insulating coating slurry and the positive electrode active material slurry are prone to penetration and material leakage, and easily lead to cracking of the positive electrode piece and sticking of the coating roller.

[0005] In a first aspect, the present invention provides a pole piece production device suitable for processing a continuously moving current collector; the pole piece production device comprises:

[0006] A first coating head, adapted to coat the first slurry on the current collector;

[0007] a first oven, disposed downstream of the first coating head, adapted to dry the current collector coated with the first slurry;

[0008] A second coating head is disposed downstream of the first oven and is suitable for coating the second slurry on the current collector, wherein the second slurry is located on at least one side of the first slurry along the width direction of the current collector;

[0009] The second oven is arranged downstream of the second coating head and is suitable for drying the current collector coated with the first slurry and the second slurry.

[0010] Beneficial effect: This embodiment sets a first coating head and a first oven, and further sets a second coating head and a second oven downstream of the first oven. After the first slurry is coated and dried, the second slurry is coated and dried. By adopting the method of step-by-step coating and step-by-step drying, the finished positive electrode sheet is finally obtained. Compared with the method of coating the ceramic slurry and the positive active material slurry together in the related art, and drying them in the same oven at the same temperature, it can avoid the situation that the ceramic slurry and the positive active material slurry are in a fluid state before drying, and the edges of the two will not penetrate or cross the materials; it has strong compatibility with the slurry characteristics, reduces the defects such as broken belts and bulging edges in the subsequent processing of the electrode sheet, and improves the process yield. And after the finished positive electrode sheet is obtained, the boundary between the area where the ceramic slurry is set and the area where the positive active material slurry is set is clear, which is convenient for the visual system to identify, improves the stability of the alignment of the positive and negative electrode sheets in the process, and avoids the abnormalities such as virtual edges and bulging at the junction. At the same time, when the electrode production equipment provided in this embodiment is used for electrode processing, the requirements for material type, slurry characteristics, wind temperature system, etc. are reduced, and there is no need to prepare multiple sets of coating gaskets of different specifications, which simplifies the coating debugging process, reduces the difficulty of coating debugging, reduces the debugging scrap rate, and effectively improves production efficiency and yield.

[0011] In an optional embodiment, one of the first slurry and the second slurry includes a positive electrode active material slurry, and the other includes an insulating coating slurry;

[0012] The positive electrode active material slurry is located in the middle of the width direction of the current collector and forms an active material layer after drying;

[0013] The insulating coating slurry is located on at least one side of the positive electrode active material slurry along the width direction of the current collector, and forms an insulating adhesive coating after drying.

[0014] Beneficial effect: The insulating coating slurry is located on at least one side of the positive electrode active material slurry along the width direction of the current collector, which is beneficial to enhance the insulation effect and improve the safety of the lithium-ion battery.

[0015] In an optional embodiment, the first oven and / or the second oven includes: a hot air drying oven, a far infrared drying oven, a microwave drying oven, a contact heating drying oven, and an electromagnetic heating drying oven.

[0016] In an optional embodiment, the second oven is connected to a negative pressure exhaust unit, which is suitable for maintaining a negative pressure state in the second oven.

[0017] In a second aspect, the present invention further provides a pole piece production process method, which is suitable for processing a continuously moving current collector to form a pole piece; the pole piece production process method comprises:

[0018] Applying the prepared first slurry to the current collector through a first coating head;

[0019] Drying the current collector coated with the first slurry to obtain an original electrode sheet;

[0020] Applying the prepared second slurry to the original electrode sheet through a second coating head, and applying the second slurry close to or adjacent to the edge of the first slurry along the width direction of the current collector;

[0021] The original electrode sheet coated with the second slurry is dried to obtain the electrode sheet.

[0022] Beneficial effects: The electrode production process provided in this embodiment is to apply the configured first slurry to the current collector through the first coating head; dry the current collector coated with the first slurry to obtain the original electrode; then apply the configured second slurry to the original electrode through the second coating head, and the second slurry is applied to the edge of the current collector in the width direction of the first slurry or close to it; dry the original electrode coated with the second slurry to obtain the electrode; first apply and dry the first slurry, and then apply and dry the second slurry, and finally obtain the finished positive electrode by adopting the step-by-step coating and step-by-step drying method. Compared with the related art method of coating the ceramic slurry and the positive active material slurry together and drying them in the same oven at the same temperature, it can avoid the situation of penetration and material cross-flow at the edges of the ceramic slurry and the positive active material slurry when they are in a fluid state before drying; it has strong compatibility with the slurry characteristics, reduces the defects such as broken bands and bulging edges in the subsequent processing of the electrode, and improves the process yield. After the finished positive electrode is obtained, the boundary between the area where the ceramic slurry is set and the area where the positive active material slurry is set is clear, which is convenient for the visual system to identify, improves the stability of the alignment of the positive and negative electrode sheets in the process, and avoids abnormal situations such as virtual edges and bulges at the junction. At the same time, when the electrode production equipment provided by this embodiment is used for electrode processing, the requirements for material type, slurry characteristics, wind temperature system, etc. are reduced, and there is no need to prepare multiple sets of coating gaskets of different specifications, which simplifies the coating debugging process, reduces the difficulty of coating debugging, reduces the debugging scrap rate, and effectively improves production efficiency and yield.

[0023] In an optional embodiment, the coating process of the second coating head includes one of spray coating, gravure coating, slot extrusion coating, and transfer coating.

[0024] In an optional embodiment, the second slurry includes ceramic powder, a binder and a solvent; the second slurry is mixed and configured in a mixing device;

[0025] The ceramic powder includes any one of aluminum oxide, boehmite, zirconium oxide, magnesium aluminum spinel and cerium oxide ceramic powder or a combination of at least two of them, and the particle size of the ceramic powder is nanometer level;

[0026] The binder includes any one or a combination of at least two of polyvinylidene fluoride, polyacrylonitrile, polyimide, perfluorosulfonic acid ionomer, carboxymethyl cellulose and polyacrylate;

[0027] The solvent includes any one or more of deionized water, N-methylpyrrolidone (NMP), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC);

[0028] The mixing equipment includes any one of a double planetary mixer, an ultrasonic disperser, a homogenizer, a centrifugal film shearing machine and a ball mill.

[0029] In an optional embodiment, the solid content of the second slurry is in the range of 20% to 80%; the viscosity of the second slurry is in the range of 1000 mPa·s to 10000 mPa·s.

[0030] In an optional embodiment, the distance between the second slurry and the edge of the first slurry along the width direction of the current collector is -1 mm to 1 mm.

[0031] Beneficial effect: When the distance between the second slurry and the edge of the first slurry along the width direction of the current collector is greater than or equal to -1mm and less than or equal to 0mm, that is, the second slurry overlaps with the first slurry. Further, in this embodiment, the second slurry is coated on the first slurry, that is, the ceramic slurry is coated on the positive electrode active material slurry. Even in the state of membrane shrinkage or poor coating, the risk of contact between the negative electrode tab and the positive electrode sheet can be reduced, and the safety performance of the battery is improved. When the distance between the second slurry and the edge of the first slurry along the width direction of the current collector is greater than 0mm and less than or equal to 1mm, that is, there is a certain distance between the second slurry and the first slurry, that is, there is a certain distance between the ceramic slurry and the positive electrode active material slurry. At this time, the distance is small. Although it cannot meet the insulation requirement 100%, it can also improve the safety performance of the battery.

[0032] In an optional embodiment, the coating width of the second slurry is 1 mm-25 mm; the coating thickness of the second slurry is 10 μm-50 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1A top view of the pole piece production equipment of the present invention;

[0035] Figure 2 It is a side view of the pole piece production equipment of the present invention.

[0036] Description of reference numerals:

[0037] 1. First coating head; 2. Coating roller; 3. First roller; 4. First oven; 5. Second roller; 6. Second coating head; 7. Second oven; 8. Third roller; 9. Current collector; 10. Insulating glue coating; 11. Active material layer; 12. Pole reel. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] In order to improve the safety of lithium-ion batteries, an insulating coating of a certain width is usually set on the edge of the ear of the positive electrode. Taking ceramic slurry as an example, the method adopted in related technologies is generally: in the coating process of the positive electrode, the configured ceramic slurry and the positive electrode active material slurry are first divided into regions and input into the die together, and then the ceramic slurry and the positive electrode active material slurry are directly extruded from the die together, and then dried in the same oven at the same temperature.

[0043] However, in this process, since both the ceramic slurry and the positive active material slurry are in a fluid state before drying, the edges of the two are prone to penetration and material leakage, which leads to abnormalities such as virtual edges and bulges at the junction after drying, which brings difficulties to the subsequent processing of the pole piece and the edge grasping of the visual system. In addition, due to the large difference in the drying speed of the ceramic slurry and the positive active material slurry, after being dried simultaneously in the same oven, it is easy to cause the positive pole piece to crack and the coating to stick to the roller, which increases the difficulty of the debugging process. On this basis, in order to achieve qualified insulating edge coating, the relevant technology must not only conduct a systematic study on the material type, slurry characteristics, wind temperature system, etc., but also prepare multiple sets of coating gaskets of different specifications. The overall debugging is difficult, the debugging time is long, and there are many scraps during debugging, which is not conducive to efficient production and cost reduction and efficiency improvement.

[0044] Combine the following Figure 1 to Figure 2 , describing an embodiment of the present invention.

[0045] According to an embodiment of the present invention, on the one hand, a pole piece production device is provided, which is suitable for processing a continuously moving current collector 9; the pole piece production device comprises:

[0046] A first coating head 1, suitable for coating the first slurry on the current collector 9;

[0047] The first oven 4 is disposed downstream of the first coating head 1 and is suitable for drying the current collector 9 coated with the first slurry;

[0048] A second coating head 6 is disposed downstream of the first oven 4 and is suitable for coating the second slurry on the current collector 9, wherein the second slurry is located on at least one side of the first slurry along the width direction of the current collector 9;

[0049] The second oven 7 is disposed downstream of the second coating head 6 and is suitable for drying the current collector 9 coated with the first slurry and the second slurry.

[0050] In this embodiment, a first coating head 1 and a first oven 4 are provided, and a second coating head 6 and a second oven 7 are further provided downstream of the first oven 4. After the first slurry is coated and dried, the second slurry is coated and dried. By adopting the method of step-by-step coating and step-by-step drying, a finished positive electrode sheet is finally obtained. Compared with the method of coating the ceramic slurry and the positive active material slurry together in the related art, and drying them in the same oven at the same temperature, it can avoid the situation that the ceramic slurry and the positive active material slurry are in a fluid state before drying, and the edges of the two will not penetrate or cross the materials; it has strong compatibility with the slurry characteristics, reduces the defects such as broken belts and bulging edges in the subsequent processing of the sheet, and improves the process yield. And after the finished positive electrode sheet is obtained, the boundary between the area where the ceramic slurry is set and the area where the positive active material slurry is set is clear, which is convenient for the visual system to identify, improves the stability of the alignment of the positive and negative sheets in the process, and avoids the abnormalities such as virtual edges and bulging at the junction. At the same time, when the electrode production equipment provided in this embodiment is used for electrode processing, the requirements for material type, slurry characteristics, wind temperature system, etc. are reduced, and there is no need to prepare multiple sets of coating gaskets of different specifications, which simplifies the coating debugging process, reduces the difficulty of coating debugging, reduces the debugging scrap rate, and effectively improves production efficiency and yield.

[0051] In some embodiments, one of the first slurry and the second slurry includes a positive electrode active material slurry, and the other includes an insulating coating slurry;

[0052] The positive electrode active material slurry is located in the middle of the current collector 9 in the width direction and forms an active material layer 11 after drying;

[0053] The insulating coating slurry is located on at least one side of the positive electrode active material slurry along the width direction of the current collector 9 and forms an insulating adhesive coating 10 after being dried.

[0054] In this embodiment, the first slurry includes positive electrode active material slurry, and correspondingly, the second slurry includes insulating coating slurry; by first coating and drying the positive electrode active material slurry, and then coating and drying the insulating coating slurry, it is beneficial to coat the insulating coating slurry on the positive electrode active material slurry, even when the diaphragm is shrunk or poorly coated, the risk of contact between the negative electrode ear and the positive electrode sheet can be reduced, thereby improving the safety performance of the battery.

[0055] The insulating coating slurry is located on at least one side of the positive electrode active material slurry along the width direction of the current collector 9. Further, in this embodiment, the insulating coating slurry is located on both sides of the positive electrode active material slurry along the width direction of the current collector 9. This is conducive to enhancing the insulation effect and improving the safety of the lithium-ion battery.

[0056] In some embodiments, the first oven 4 and / or the second oven 7 comprises: one of a hot air drying oven, a far infrared drying oven, a microwave drying oven, a contact heating drying oven, and an electromagnetic heating drying oven.

[0057] In some embodiments, the second oven 7 is connected to a negative pressure exhaust unit, which is suitable for maintaining a negative pressure state in the second oven 7.

[0058] By connecting the second oven 7 with a negative pressure exhaust unit, the second oven 7 is maintained in a negative pressure state, thereby reducing the impurities falling on the active material layer 11 of the positive electrode during the drying process, thereby ensuring the cleanliness of the electrode sheet.

[0059] Additionally, the first oven 4 may also be connected to a negative pressure exhaust unit to maintain a negative pressure state in the first oven 4 during the drying process.

[0060] Combination Figure 1 , Figure 2 As shown, the electrode production equipment provided in this embodiment also includes:

[0061] A coating roller 2, which is arranged on a side of the current collector 9 away from the first coating head 1, and is supported by the coating roller 2 to ensure uniform coating of the first slurry on the current collector 9;

[0062] The first roller 3 is disposed between the coating roller 2 and the first oven 4, and plays a supporting role for the current collector 9, so as to facilitate the transfer of the current collector 9 to the downstream;

[0063] The second roller 5 is disposed between the first oven 4 and the second coating head 6, and plays a supporting role for the current collector 9, so as to facilitate the transfer of the current collector 9 to the downstream; and under the joint support of the first roller 3 and the second roller 5, the current collector 9 is ensured to be in a straight state when passing through the first oven 4, so as to ensure uniform heating during the drying process;

[0064] The third roller 8 is arranged downstream of the second oven 7, and plays a supporting role for the current collector 9, so as to facilitate the transfer of the current collector 9 to the downstream; and under the joint support of the second roller 5 and the third roller 8, the current collector 9 is ensured to be in a straight state when passing through the second oven 7, so as to ensure uniform heating during the drying process;

[0065] After the electrode reel 12 passes through the second oven 7, the formed positive electrode sheet has been processed and is rolled up by the electrode reel 12 for subsequent processing and transportation.

[0066] According to an embodiment of the present invention, on the other hand, a pole piece production process method is also provided, which is suitable for processing a continuously moving current collector 9 to form a pole piece; the pole piece production process method comprises:

[0067] S10 : coating the prepared first slurry on the current collector 9 through the first coating head 1 .

[0068] In this embodiment, the first slurry includes positive electrode active material slurry, which is injected into the first coating head 1 and then extruded or transferred through the first coating head 1 to uniformly coat the positive electrode active material slurry on the foil of the current collector 9, thereby forming an active material layer 11.

[0069] S20: drying the current collector 9 coated with the first slurry to obtain an original electrode sheet.

[0070] The current collector 9 carries the coated positive electrode active material slurry, is transported to the first oven 4 after passing through the first roller 3, is heated and baked, and is dried to obtain the original electrode sheet.

[0071] S30 : coating the prepared second slurry on the original electrode sheet through the second coating head 6 , and coating the second slurry close to or adjacent to the edge of the first slurry along the width direction of the current collector 9 .

[0072] In this embodiment, the second slurry may be an insulating coating slurry.

[0073] The original electrode obtained after drying passes through the second roller 5 and arrives at the position of the second coating head 6. The prepared insulating coating slurry is injected into the second coating head 6, and then squeezed or transferred by the second coating head 6, so that the insulating coating slurry is evenly coated on the original electrode to form an insulating glue coating 10. The insulating coating slurry needs to be coated on the edge of the active material layer 11 according to a certain size.

[0074] S40: Drying the original electrode sheet coated with the second slurry to obtain the electrode sheet.

[0075] The original electrode sheet coated with the second slurry is transported into the second oven 7 for drying to obtain a positive electrode sheet, and then the positive electrode sheet is transported to the electrode sheet reel 12 through the third roller 8 for winding.

[0076] The electrode production process provided in this embodiment is as follows: the first slurry is applied to the current collector through the first coating head; the current collector coated with the first slurry is dried to obtain the original electrode; then the second slurry is applied to the original electrode through the second coating head, and the second slurry is applied to the edge of the current collector in the width direction of the first slurry or close to it; the original electrode coated with the second slurry is dried to obtain the electrode; the first slurry is applied and dried first, and then the second slurry is applied and dried, and the finished positive electrode is finally obtained by adopting the step-by-step coating and step-by-step drying method. Compared with the related art method of applying the ceramic slurry and the positive active material slurry together and drying them in the same oven at the same temperature, it can avoid the situation of penetration and material cross-flow at the edges of the ceramic slurry and the positive active material slurry when they are in a fluid state before drying; it has strong compatibility with the slurry characteristics, reduces the defects such as broken bands and bulging edges in the subsequent processing of the electrode, and improves the process yield. After the finished positive electrode is obtained, the boundary between the area where the ceramic slurry is set and the area where the positive active material slurry is set is clear, which is convenient for the visual system to identify, improves the stability of the alignment of the positive and negative electrode sheets in the process, and avoids abnormal situations such as virtual edges and bulges at the junction. At the same time, when the electrode production equipment provided by this embodiment is used for electrode processing, the requirements for material type, slurry characteristics, wind temperature system, etc. are reduced, and there is no need to prepare multiple sets of coating gaskets of different specifications, which simplifies the coating debugging process, reduces the difficulty of coating debugging, reduces the debugging scrap rate, and effectively improves production efficiency and yield.

[0077] In some embodiments, the coating process of the second coating head 6 includes one of spray coating, gravure coating, slot extrusion coating, and transfer coating.

[0078] In some embodiments, the second slurry includes ceramic powder, a binder and a solvent; the second slurry is mixed and configured in a mixing device;

[0079] The ceramic powder includes any one of aluminum oxide, boehmite, zirconium oxide, magnesium aluminum spinel and cerium oxide ceramic powder or a combination of at least two of them, and the particle size of the ceramic powder is nanometer level;

[0080] The binder includes any one or a combination of at least two of polyvinylidene fluoride, polyacrylonitrile, polyimide, perfluorosulfonic acid ionomer, carboxymethyl cellulose and polyacrylate;

[0081] The solvent includes any one or more of deionized water, N-methylpyrrolidone NMP, ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC);

[0082] The mixing equipment includes any one of a double planetary mixer, an ultrasonic disperser, a homogenizer, a centrifugal film shearing machine and a ball mill.

[0083] In this embodiment, the binder is preferably polyvinylidene fluoride.

[0084] In some embodiments, the solid content of the second slurry ranges from 20% to 80%; the viscosity of the second slurry ranges from 1000 mPa·s to 10000 mPa·s.

[0085] In some embodiments, the distance between the second slurry and the edge of the first slurry along the width direction of the current collector 9 is -1 mm to 1 mm.

[0086] Among them, when the distance between the second slurry and the edge of the first slurry along the width direction of the current collector 9 is greater than or equal to -1mm and less than or equal to 0mm, that is, the second slurry overlaps with the first slurry. Furthermore, in this embodiment, the second slurry is coated on top of the first slurry, that is, the ceramic slurry is coated on top of the positive electrode active material slurry. Even when the diaphragm is shrunk or poorly coated, the risk of contact between the negative electrode tab and the positive electrode sheet can be reduced, thereby improving the safety performance of the battery.

[0087] Among them, when the distance between the second slurry and the edge of the first slurry along the width direction of the current collector 9 is greater than 0 mm and less than or equal to 1 mm, that is, there is a certain distance between the second slurry and the first slurry, that is, there is a certain distance between the ceramic slurry and the positive electrode active material slurry. At this time, the distance is small. Although it cannot meet the insulation requirements 100%, it can also improve the safety performance of the battery.

[0088] In some embodiments, the coating width of the second slurry is 1 mm-25 mm; the coating thickness of the second slurry is 10 μm-50 μm.

[0089] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A pole piece production equipment, characterized in that: Suitable for processing a continuously moving current collector (9); The pole piece production equipment comprises: A first coating head (1), adapted to coat the first slurry on the current collector (9); a first oven (4), arranged downstream of the first coating head (1), suitable for drying the current collector (9) coated with the first slurry; a second coating head (6), disposed downstream of the first oven (4), adapted to coat the second slurry on the current collector (9), the second slurry being located on at least one side of the first slurry along the width direction of the current collector (9); The second oven (7) is arranged downstream of the second coating head (6) and is suitable for drying the current collector (9) coated with the first slurry and the second slurry.

2. The pole piece production equipment according to claim 1, characterized in that: One of the first slurry and the second slurry includes a positive electrode active material slurry, and the other includes an insulating coating slurry; The positive electrode active material slurry is located in the middle of the width direction of the current collector (9), and forms an active material layer (11) after drying; The insulating coating slurry is located on at least one side of the positive electrode active material slurry along the width direction of the current collector (9), and forms an insulating glue coating (10) after drying.

3. The pole piece production equipment according to claim 1, characterized in that: The first drying oven (4) and / or the second drying oven (7) comprises: one of a hot air drying oven, a far infrared drying oven, a microwave drying oven, a contact heating drying oven, and an electromagnetic heating drying oven.

4. The pole piece production equipment according to claim 1, characterized in that: The second oven (7) is connected to a negative pressure exhaust unit, which is suitable for maintaining a negative pressure state in the second oven (7).

5. A pole piece production process, characterized in that: Suitable for processing the continuously moving current collector (9) into a pole piece; The pole piece production process method comprises: Applying the prepared first slurry to the current collector (9) through a first coating head (1); Drying the current collector (9) coated with the first slurry to obtain an original electrode sheet; The prepared second slurry is applied to the original electrode sheet through a second coating head (6), and the second slurry is applied in contact with or close to the edge of the first slurry along the width direction of the current collector (9); The original electrode sheet coated with the second slurry is dried to obtain the electrode sheet.

6. The pole piece production process according to claim 5, characterized in that: The coating process of the second coating head (6) includes one of spray coating, gravure coating, slit extrusion coating and transfer coating.

7. The pole piece production process according to claim 5, characterized in that: The second slurry includes ceramic powder, a binder and a solvent; the second slurry is mixed and configured in a mixing device; The ceramic powder comprises any one or a combination of at least two of alumina, boehmite, zirconia, magnesia spinel and cerium oxide ceramic powders, and the particle size of the ceramic powder is nanometer scale; The binder includes any one or a combination of at least two of polyvinylidene fluoride, polyacrylonitrile, polyimide, perfluorosulfonic acid ionomer, carboxymethyl cellulose and polyacrylate; The solvent includes any one or more of deionized water, N-methylpyrrolidone (NMP), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC); The mixing equipment includes any one of a double planetary mixer, an ultrasonic disperser, a homogenizer, a centrifugal film shearing machine and a ball mill.

8. The pole piece production process according to claim 5, characterized in that: The solid content of the second slurry ranges from 20% to 80%; the viscosity of the second slurry ranges from 1000 mPa·s to 10000 mPa·s.

9. The pole piece production process according to claim 5, characterized in that: The distance between the second slurry and the edge of the first slurry along the width direction of the current collector (9) is -1 mm to 1 mm.

10. The pole piece production process according to claim 5, characterized in that: The coating width of the second slurry is 1 mm-25 mm; the coating thickness of the second slurry is 10 μm-50 μm.

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