WO2024066655A1 - 一种电池极片及其制备方法 - Google Patents

一种电池极片及其制备方法 Download PDF

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Publication number
WO2024066655A1
WO2024066655A1 PCT/CN2023/106588 CN2023106588W WO2024066655A1 WO 2024066655 A1 WO2024066655 A1 WO 2024066655A1 CN 2023106588 W CN2023106588 W CN 2023106588W WO 2024066655 A1 WO2024066655 A1 WO 2024066655A1
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WIPO (PCT)
Prior art keywords
coating
pole piece
thinning
area
battery
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PCT/CN2023/106588
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English (en)
French (fr)
Inventor
谢安河
赵云龙
潘伟
齐东方
杨洁
Original Assignee
惠州锂威新能源科技有限公司
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Publication of WO2024066655A1 publication Critical patent/WO2024066655A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention belongs to the technical field of batteries, and in particular relates to a battery pole piece and a preparation method thereof.
  • the mainstream is to adopt a center-placed pole ear structure.
  • the existing technology mainly pre-sets the slot for welding the pole ear before slitting, and die-cuts the edge material facing the welding pole ear in the slot during the winding process after slitting.
  • the die-cutting station equipment is added, which increases the equipment cost, increases the frequency of tape breakage in the process, reduces the winding efficiency, and also introduces a series of problems such as pole powder generated by die-cutting, which falls into the battery cell and affects the K value and other performance.
  • the other method is to cut in the slot area during slitting, so that part of the slot is reserved for the opposite side of the adjacent pole piece pole ear, but the slot in the non-welding area of slitting needs to be processed to avoid the aluminum foil in the slot facing the negative electrode.
  • the diaphragm is punctured, the anode and the aluminum foil are in direct contact, causing a short-circuit safety risk.
  • One of the purposes of the present invention is to provide a battery pole piece to address the deficiencies of the prior art, which can simplify the production process, avoid battery safety problems, and help improve battery quality by optimizing the pole piece structure.
  • the present invention adopts the following technical solution:
  • a battery pole piece comprising a pole piece body and a pole lug; the pole piece body comprises a current collector and a coating coated on the surface of the current collector, and the surface of the pole piece body has a groove area and a thinning area; wherein the current collector is exposed to the surface of the groove area of the pole piece body and is welded to the end of the pole lug; the coating is exposed to the surface of the thinning area of the pole piece body and is close to the pole lug.
  • the thinning area of the pole piece body is located between the edge of the slot area and the edge of the pole piece body.
  • the distance W between the edge of the slot area and the edge of the pole piece body is smaller than the width L of the thinning area, wherein 0 ⁇ W ⁇ 8mm.
  • the coating in the thinning area is formed with a thinning portion, the tab is close to the thinning portion, and the thickness h of the thinning portion is 10 to 50 um.
  • the thickness H of the coating in the thinning area before thinning is 20-100 um.
  • the thinning thickness h of the coating in the thinning area is 10 to 80 um.
  • the coating is a single-layer structure or a multi-layer structure.
  • the coating includes at least one of an active material layer, a safety coating, a carbon coating and an insulating coating in the thickness direction thereof.
  • the coating located in the slot area forms a slot
  • the slot includes a bottom and a side wall
  • the side wall extends upward from the bottom
  • the bottom is a current collector exposed to the surface of the pole piece body
  • the coating surrounds the side wall.
  • a second object of the present invention is to provide a method for preparing a battery electrode, comprising:
  • the pole pieces are sequentially cleaned, rolled and cut;
  • the end of the pole ear is welded to the slot so that the pole ear portion is close to the thinning portion.
  • the beneficial effect of the present invention is that the present invention performs a thinning treatment on the coating at the thinning area of the pole piece body, that is, performs a thinning treatment on the coating at the position toward the pole ear, thereby eliminating the need for die-cutting slots or cutting to the slot area after slitting, which not only simplifies the production process, but also avoids battery safety problems caused by the above process, thereby improving the manufacturing efficiency and yield rate of the battery.
  • a slot area is provided on the surface of the pole piece body, and the end of the pole ear can be welded to the current collector exposed on the surface of the slot area, and the pole ear is close to the coating of the thinning area.
  • the present invention can simplify the production process, avoid battery safety problems, and help improve the quality of the battery by optimizing the pole piece structure.
  • FIG. 1 is one of the structural schematic diagrams of the pole piece body of the present invention.
  • FIG. 2 is one of the schematic diagrams of the pole piece body of the present invention before thinning.
  • FIG. 3 is a second schematic diagram of the structure of the pole piece body of the present invention.
  • FIG. 4 is a second schematic diagram of the pole piece body of the present invention before thinning.
  • FIG. 5 is a schematic diagram of a wide-width pole piece of the present invention.
  • FIG. 6 is a schematic diagram of a wide electrode piece after cutting according to the present invention.
  • FIG. 7 is a schematic diagram of laser cleaning of a pole piece according to the present invention.
  • FIG8 is a schematic diagram of the operation of the laser transmitter of the present invention.
  • FIG. 9 is a schematic diagram of a scraper process according to the present invention.
  • the reference numerals are described as follows: 1-pole body; 11-current collector; 12-coating; 2-Pole ear; 3- Slot area; 4-Thinning area; 5-Thinning part; 6-slots; 7-Laser transmitter; 8-galvanometer; 9-field lens; 10- Platform; 101-scraper; 102- fan; 103-air negative pressure dust removal device; 104-carrier; Y-width direction.
  • the terms “installed”, “connected”, “connected”, “fixed” and the like 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 an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • installed 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 an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • the specific meanings of the above terms in the invention can be understood according to specific circumstances.
  • a battery pole piece comprises a pole piece body 1 and a pole ear 2; the pole piece body 1 comprises a current collector 11 and a coating 12 coated on the surface of the current collector 11, and the surface of the pole piece body 1 has a groove area 3 and a thinning area 4; wherein the current collector 11 is exposed on the surface of the groove area 3 of the pole piece body 1 and is welded to the end of the pole ear 2; the coating 12 is exposed on the surface of the thinning area 4 of the pole piece body 1 and is close to the pole ear 2.
  • the existing structure requires the addition of die-cutting station equipment, the equipment cost is increased, the frequency of tape breakage in the process is increased, the winding efficiency is reduced, and at the same time, a series of problems such as pole powder generated by die-cutting are introduced, and the pole powder falls into the battery cell and affects the K value and other performance; the slots in the non-welding area of the slitting need to be processed.
  • the diaphragm is punctured, the anode and the aluminum foil are in direct contact, causing a short circuit safety risk.
  • thinning the coating 12 at the thinning area 4 of the pole piece body 1 that is, by thinning the coating 12 at the position facing the pole ear 2, the need to die-cut the slot after slitting or the need to slitting to the slot area is eliminated, which not only simplifies the production process, but also avoids battery safety problems caused by the above process, thereby improving the manufacturing efficiency and yield of the battery.
  • a slot area 3 is provided on the surface of the pole piece body 1, and the end of the pole ear 2 can be welded to the collector 11 exposed on the surface of the slot area 3, and the pole ear 2 is close to the top surface of the coating 12 in the thinning area 4 to avoid affecting the overall thickness of the battery cell.
  • the thinning area 4 of the pole piece body 1 is located between the edge of the slot area 3 and the edge of the pole piece body 1.
  • the slot area 3 is square in shape, and the slot area 3 is close to the edge of one side of the width direction Y of the pole piece body 1.
  • the area between the slot area 3 and the edge of the pole piece body 1 is the thinning area 4, which can be understood as the slot edge material in the protruding direction of the pole ear 2, that is, the coating 12 located in the thinning area 4. It should be noted that the protruding direction of the pole ear is the same as the width direction Y of the pole piece body 1.
  • the distance W between the edge of the slot area 3 and the edge of the pole piece body 1 is less than the width L of the thinning area 4, wherein 0 ⁇ W ⁇ 8mm, specifically, the width L of the thinning area 4 can be understood as the thinning length of the slot edge material in the direction of the pole ear 2 protruding, and the distance W between the edge of the slot area 3 and the edge of the pole piece body 1 can be understood as the width of the edge material in the direction of the pole ear 2, W ⁇ L, ensuring that the thinned coating 12 does not need to die-cut the slot edge to leave residual paint after cutting, and does not affect the overall thickness of the battery cell, thereby improving the efficiency, quality and quality of the battery manufacturing process.
  • the coating 12 located in the thinning area 4 is formed with a thinning portion 5, the pole ear 2 is close to the thinning portion 5, and the thickness h of the thinning portion 5 is 10 to 50 um.
  • the thickness h of the thin portion 5 can be controlled, which can be understood as the thickness of the slot edge material in the protruding direction of the pole ear 2 after thinning.
  • the thickness after thinning is 10um, 20um, 30um, 40um, 50um, etc., which can match the pole ear 2 to avoid affecting the overall thickness of the battery cell.
  • the thickness H of the coating 12 in the thinning area 4 before thinning is 20 ⁇ 100um can be understood as the thickness of the slot edge material before thinning that controls the protruding direction of the tab 2.
  • the thickness before thinning is 20um, 30um, 40um, 50um, 60um, 70um, 80um, 90um, 100um, etc.
  • the thickness may be the same as or different from the thickness of the coating 2 in other areas, and is not limited here.
  • the thinning thickness h1 of the coating 12 in the thinning area 4 is 10 to 80 um, which can be understood as the thinning thickness of the slot edge material that controls the protruding direction of the pole ear 2.
  • the thinning thickness is 10 um, 20 um, 30 um, 40 um, 50 um, 60 um, 70 um, 80 um, etc.
  • the thinning thickness can match the thickness of the pole ear 2 to avoid affecting the overall thickness of the battery cell.
  • the lithium-ion battery includes a battery cell, which may include at least two electrodes stacked on each other and having opposite polarities, the electrodes being the positive electrode of the battery and the negative electrode of the battery.
  • a diaphragm is provided between each two adjacent electrode sheets, and the electrode sheets with opposite polarities are electrically isolated by the diaphragm.
  • At least one of the electrode sheets may be the above-mentioned battery electrode sheet.
  • the at least two pole pieces may include a first pole piece and a second pole piece, the first pole piece and the second pole piece have opposite polarities, and the first pole piece and the second pole piece are stacked on each other.
  • the first electrode piece may be a positive electrode piece, adopting the positive electrode piece structure of the above-mentioned embodiments 1 to 8, and the second electrode piece may be a negative electrode piece; or, the first electrode piece may be a negative electrode piece, and the second electrode piece may be a positive electrode piece, which is not limited here.
  • the battery cell may be a wound battery cell, wherein the first pole piece and the second pole piece are both one, and the first pole piece, the diaphragm, and the second pole piece stacked in sequence are wound around a winding center to form a winding structure.
  • the battery cell may be a laminated battery cell, wherein there are a plurality of first pole pieces and a plurality of second pole pieces, the plurality of first pole pieces and the plurality of second pole pieces are alternately stacked in the same direction, and a diaphragm is provided between each adjacent first pole piece and second pole piece to electrically insulate the first pole piece and the second pole piece.
  • the working principle of the present invention is:
  • the coating 12 at the thinning area 4 of the pole piece body 1 is thinned, that is, the pole ear 2 is directed toward The coating 12 at the position is thinned, which eliminates the need to die-cut the grooves after slitting or the need to slitting to the groove area, which not only simplifies the production process, but also avoids battery safety problems caused by the above process, thereby improving the manufacturing efficiency and yield of the battery.
  • a groove area 3 is provided on the surface of the pole piece body 1, and the end of the pole ear 2 can be welded to the collector 11 exposed on the surface of the groove area 3, and the pole ear 2 is close to the top surface of the coating 12 in the thinning area 4 to avoid affecting the overall thickness of the battery cell.
  • the coating 12 of this embodiment is a single-layer structure or a multi-layer structure, and the coating 12 includes at least one of an active material layer, a safety coating, a carbon-coated coating and an insulating coating in its thickness direction.
  • the thickness of the coating 12 may include one coating thickness, or may be composed of two or more coating thicknesses.
  • the active material coating when there is one coating, it is an active material coating; when there are two coatings, it may be a combination of an active material coating and a carbon-coated coating with extremely strong conductivity, or it may be a combination of an active material coating and a safety coating, and the safety coating has high thermal stability, and may also include a coating such as lithium iron phosphate with stable chemical properties; it may also be an active material coating and an insulating coating with pores, such as a ceramic coating; when there are three or more coatings, it may be a combination coating of any of the above-mentioned coatings.
  • the coating 12 located in the slot area 3 of this embodiment forms a slot 6,
  • the slot 6 includes a bottom and a side wall, the side wall extends upward from the bottom, the bottom is the current collector 11 exposed on the surface of the pole piece body 1, and the coating 12 surrounds the side wall.
  • the slot 6 has four side walls, the four side walls and the bottom surround the slot 6, the bottom is the current collector 11 exposed to the outside, and the pole ear 2 is welded to the current collector 11 there.
  • a method for preparing a battery pole piece comprising:
  • the coating 12 of the thinning area 4 is thinned to form a thinning portion 5;
  • the electrode pieces are sequentially cleaned, rolled and cut, so that the wide electrode pieces are cut into a plurality of electrode pieces bodies 1;
  • the end of the pole tab 2 is welded to the slot 6 so that a portion of the pole tab 2 is close to the thinned portion 5 .
  • the active material slurry is coated on both sides of the current collector 11 by a coating machine, and then rolled up after being baked and dried;
  • the wide electrode piece is cleaned by laser to form the groove 6 , or the groove 6 is scraped out by a scraper, or the groove 6 for the electrode tab 2 to be welded is formed by other methods;
  • the energy laser generated by the laser can be focused to clean the coating material on the current collector 11.
  • the coating 12 at the edge of the slot 6 is cleaned again or the surface coating 12 is thinned by a scraper.
  • a vacuum negative pressure dust removal device 103 is added while the laser cleaning or scraper treatment is performed to remove the generated pole piece and pole powder.
  • the laser power for cleaning the coating 12 at the edge of the slot 6 again is less than the laser power for cleaning the slot 6.
  • the laser cleaning device includes but is not limited to a laser emitter 7, a galvanometer 8, a field lens 9 and a platform 10 which are arranged in sequence from top to bottom.
  • a total reflection mirror and an output reflection mirror are arranged in parallel in the laser emitter 7.
  • the laser passes through the total reflection mirror and the output reflection mirror in sequence, and then is emitted through an isolator.
  • the isolator plays a protective role, isolating the reflected laser during operation to ensure the safety of the optical path.
  • the galvanometer 8 reflects the laser and can refract at different angles.
  • the field lens 9 controls the focal length of the laser and can control the marking area.
  • the platform 10 is located at the bottom and can transport the electrode to a preset position for laser cleaning.
  • the scraper treatment includes but is not limited to a scraper 101, a fan 102, an air negative pressure dust removal device 103 and a carrier 104.
  • the scraper 101 and the carrier 104 can be made of tungsten steel or other metals.
  • the pole piece is fixed on the carrier 104.
  • the scraper 101 is perpendicular to the pole piece and scrapes off the coating 12 by reciprocating motion.
  • the fan 102 and the air negative pressure dust removal device 103 are located on both sides of the scraper 101, which can remove the generated pole piece powder.
  • the thinned coating 12 can be the electrode 2 welding surface coating or the double-sided coating. According to the actual situation, the slot 6 and the thinned coating 12 obtained by laser cleaning or scraping need to be physically cleaned again with a brush to clean the loose dust on the surface again, and then cleaned with dust-free paper.
  • the thinning length L of the slot edge material in the protruding direction of each pole ear 2 is: W ⁇ L
  • the thickness H of the slot edge material in the protruding direction of each pole ear 2 before thinning is controlled at 20-100um
  • the thickness h1 of the slot edge material in the protruding direction of each pole ear 2 is controlled at 10-80um
  • the thickness h of the slot edge material in the protruding direction of each pole ear 2 after thinning is controlled at 10-50um
  • the coating 12 on the contact surface of the pole ear 2 can be thinned, and the coating 12 on both sides can also be thinned;
  • the electrode sheet is subjected to rolling and slitting processes, and the slitting process slits the wide electrode sheet into small electrode sheets.

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本发明属于电池的技术领域，具体涉及一种电池极片，包括极片本体和极耳；所述极片本体，包括集流体及涂覆在所述集流体表面的涂层，所述极片本体的表面具有槽位区和减薄区；其中，所述集流体暴露于所述极片本体的槽位区表面，且与所述极耳的端部焊接；所述涂层暴露于所述极片本体的减薄区表面，且贴近所述极耳。本发明通过优化极片结构，能够简化生产工序，避免电池产生安全问题，有助于提高电池的质量。此外，本发明还公开了一种电池极片的制备方法。

Description

一种电池极片及其制备方法 技术领域
本发明属于电池的技术领域，具体涉及一种电池极片及其制备方法。
背景技术
当前手机消费市场，要想能在市场中占据一定份额并具备足够产品竞争力，主流方向为快充，高能量密度，高安全性能，及高长循环。
针对结构方面，主流的是采用极耳中置结构，针对现有中置结构，现有技术主要是通过在分切前预设置焊接极耳的槽位，分切后在卷绕工序通过模切将槽位焊接极耳朝向的边料模切，但增加了模切工位设备，增加了设备成本，过程断带频率增加、降低卷绕效率，同时还引入了模切产生的极粉，极粉掉入电芯影响K值等性能等一系列问题；另一种为分切时在槽位区域分切，使之部分槽位预留在相邻极片极耳朝向对侧位置，但需要对分切非焊接区域的槽位进行处理，避免该区域槽位铝箔正对负极，当隔膜刺破时阳极与铝箔直接接触造成短路安全风险。
发明内容
本发明的目的之一在于：针对现有技术的不足，提供一种电池极片，通过优化极片结构，能够简化生产工序，避免电池产生安全问题，有助于提高电池的质量。
为了实现上述目的，本发明采用如下技术方案：
一种电池极片，包括极片本体和极耳；所述极片本体，包括集流体及涂覆在所述集流体表面的涂层，所述极片本体的表面具有槽位区和减薄区；其中，所述集流体暴露于所述极片本体的槽位区表面，且与所述极耳的端部焊接；所述涂层暴露于所述极片本体的减薄区表面，且贴近所述极耳。
优选的，所述极片本体的减薄区位于所述槽位区边缘和所述极片本体边缘之间。
优选的，在所述极片本体的宽度方向Y上，所述槽位区边缘和所述极片本体边缘之间的距离W小于所述减薄区的宽度L，其中，0＜W≤8mm。
优选的，位于减薄区的所述涂层形成有减薄部，所述极耳贴近所述减薄部，所述减薄部的厚度h为10～50um。
优选的，位于减薄区所述涂层在减薄前的厚度H为20～100um。
优选的，位于减薄区所述涂层的减薄厚度h为10～80um。
优选的，所述涂层为单层结构或多层结构。
优选的，所述涂层在其厚度方向包括活性物质层、安全涂层、涂炭涂层及绝缘涂层中的至少一种。
优选的，位于槽位区的所述涂层形成有槽位，所述槽位包括底部和侧壁，所述侧壁从所述底部向上延伸，所述底部为暴露于所述极片本体表面的集流体，所述涂层围成所述侧壁。
本发明的目的之二在于提供一种电池极片的制备方法，包括：
将涂层的浆料涂覆在集流体上；
将槽位区的涂层刮出或激光清洗，形成槽位；
将减薄区的涂层进行减薄，形成减薄部；
将极片依次经过清洁、辊压和分切；
将极耳的端部焊接在槽位，使得极耳部分贴近减薄部。
本发明的有益效果在于，本发明通过对极片本体的减薄区位置的涂层进行减薄处理，即通过极耳朝向位置的涂层进行减薄处理，省去了分切后需模切槽位或需分切到槽位区域，不仅简化生产工序，还避免上述工序产生电池安全问题，从而提升电池的制造效率和良品率，此外，在极片本体的表面设有槽位区，可将极耳的端部焊接在暴露于槽位区表面的集流体上，且极耳贴近减薄区的涂 层顶面，避免影响电芯整体厚度。本发明通过优化极片结构，能够简化生产工序，避免电池产生安全问题，有助于提高电池的质量。
附图说明
下面将参考附图来描述本发明示例性实施方式的特征、优点和技术效果。
图1为本发明的极片本体的结构示意图之一。
图2为本发明的极片本体在减薄前的示意图之一。
图3为本发明的极片本体的结构示意图之二。
图4为本发明的极片本体在减薄前的示意图之二。
图5为本发明的宽幅极片的示意图。
图6为本发明的宽幅极片分切后的示意图。
图7为本发明的极片激光清洗的示意图。
图8为本发明的激光发射器的工作示意图。
图9为本发明的刮刀处理的示意图。
其中，附图标记说明如下：
1-极片本体；11-集流体；12-涂层；
2-极耳；
3-槽位区；
4-减薄区；
5-减薄部；
6-槽位；
7-激光发射器；
8-振镜；
9-场镜；
10-平台；
101-刮刀；
102-风机；
103-空负压除尘装置；
104-载台；
Y-宽度方向。
具体实施方式
如在说明书及权利要求当中使用了某些词汇来指称特定组件。本领域技术人员应可理解，硬件制造商可能会用不同名词来称呼同一个组件。本说明书及权利要求并不以名称的差异来作为区分组件的方式，而是以组件在功能上的差异来作为区分的准则。如在通篇说明书及权利要求当中所提及的“包含”为一开放式用语，故应解释成“包含但不限定于”。“大致”是指在可接受的误差范围内，本领域技术人员能够在一定误差范围内解决技术问题，基本达到技术效果。
此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
在发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
以下结合附图1～9对本发明作进一步详细说明，但不作为对本发明的限定。
实施方式一
电池极片，包括极片本体1和极耳2；极片本体1，包括集流体11及涂覆在集流体11表面的涂层12，极片本体1的表面具有槽位区3和减薄区4；其中，集流体11暴露于极片本体1的槽位区3表面，且与极耳2的端部焊接；涂层12暴露于极片本体1的减薄区4表面，且贴近极耳2。
由于现有结构需要增加了模切工位设备，增加了设备成本，过程断带频率增加、降低卷绕效率，同时还引入了模切产生的极粉，极粉掉入电芯影响K值等性能等一系列问题；需对分切非焊接区域的槽位进行处理，当隔膜刺破时阳极与铝箔直接接触造成短路安全风险，因此，通过对极片本体1的减薄区4位置的涂层12进行减薄处理，即通过极耳2朝向位置的涂层12进行减薄处理，省去了分切后需模切槽位或需分切到槽位区域，不仅简化生产工序，还避免上述工序产生电池安全问题，从而提升电池的制造效率和良品率，此外，在极片本体1的表面设有槽位区3，可将极耳2的端部焊接在暴露于槽位区3表面的集流体11上，且极耳2贴近减薄区4的涂层12顶面，避免影响电芯整体厚度。
在根据本发明的电池极片中，极片本体1的减薄区4位于槽位区3边缘和极片本体1边缘之间。具体的，槽位区3的形状为方形，槽位区3靠近极片本体1的宽度方向Y的一侧边缘，槽位区3和极片本体1边缘之间的区域作为减薄区4，可以理解为极耳2探出方向的槽位边料，即位于减薄区4的涂层12。需要说明的是：极耳的探出方向与极片本体1的宽度方向Y相同。
在根据本发明的电池极片中，在极片本体1的宽度方向Y上，槽位区3边缘和极片本体1边缘之间的距离W小于减薄区4的宽度L，其中，0＜W≤8mm，具体的，减薄区4的宽度L可以理解为极耳2探出方向的槽位边料减薄长度，槽位区3边缘和极片本体1边缘之间的距离W可以理解为极耳2朝向的边料宽度，W≤L，确保削薄的涂层12在分切后不需模切槽位边缘残留涂料，且不影响电芯整体厚度，从而提升电池制造过程的效率、优率及品质。
在根据本发明的电池极片中，位于减薄区4的涂层12形成有减薄部5，极耳2贴近减薄部5，减薄部5的厚度h为10～50um，控制薄部5的厚度h，可以理解为将极耳2探出方向的槽位边料减薄后厚度，例如，减薄后厚度为10um、20um、30um、40um、50um等，可与极耳2相匹配，避免影响电芯整体厚度。
在根据本发明的电池极片中，位于减薄区4涂层12在减薄前的厚度H为 20～100um，可以理解为控制极耳2探出方向的槽位边料减薄前厚度，例如，减薄前厚度为20um、30um、40um、50um、60um、70um、80um、90um、100um等，该厚度与其他区域的涂层2的厚度可以相同，也可以不相同，这里不作限定。
在根据本发明的电池极片中，位于减薄区4涂层12的减薄厚度h1为10～80um，可以理解为控制极耳2探出方向的槽位边料减薄厚度，例如，减薄厚度为10um、20um、30um、40um、50um、60um、70um、80um等，减薄厚度可与极耳2的厚度相匹配，避免影响电芯整体厚度。
锂离子电池包括电芯，该电芯可以包括至少两个相互叠设且极性相反的极片，极性相反的极片分别为电池的正极极片和电池的负极极片。为了避免正负极极片之间短路，每相邻两个极片之间设置有隔膜，极性相反的极片通过隔膜电性隔离。至少其中一个极片可以为上述电池极片。
至少两个极片可以包括第一极片和第二极片，第一极片和第二极片的极性相反，且第一极片和第二极片相互叠设。
具体的，第一极片可以为正极极片，采用上述实施例1～8的正极极片结构，第二极片可以是负极极片；或者，第一极片可以为负极极片，第二极片可以是正极极片，此处不做限制。
在一些示例中，电芯可以为卷绕式的电芯。其中，第一极片和第二极片均为一个，依次叠设的第一极片、隔膜和第二极片绕卷绕中心卷绕，并形成卷绕结构。
在另一些示例中，电芯可以为叠片式的电芯。其中，第一极片为多个，第二极片为多个，多个第一极片和多个第二极片沿同一方向依次交错层叠设置，且每相邻的第一极片和第二极片之间设置有隔膜，以使第一极片和第二极片之间电性绝缘。
本发明的工作原理是：
通过对极片本体1的减薄区4位置的涂层12进行减薄处理，即通过极耳2朝向 位置的涂层12进行减薄处理，省去了分切后需模切槽位或需分切到槽位区域，不仅简化生产工序，还避免上述工序产生电池安全问题，从而提升电池的制造效率和良品率，此外，在极片本体1的表面设有槽位区3，可将极耳2的端部焊接在暴露于槽位区3表面的集流体11上，且极耳2贴近减薄区4的涂层12顶面，避免影响电芯整体厚度。
实施方式二
与实施方式一不同的是：本实施方式的涂层12为单层结构或多层结构，涂层12在其厚度方向包括活性物质层、安全涂层、涂炭涂层及绝缘涂层中的至少一种。具体的，涂层12的厚度可以包括一种涂层厚度，也可以为两种或两种以上涂层厚度组成。其中，一种涂层时为活性物质涂层；在两种涂层时，可以是活性物质涂层和含导电性极强的涂炭涂层组合，也可以是活性物质涂层和安全涂层组合，安全涂层为热稳定性高，也可以包含化学性能稳定的磷酸铁锂等涂层；也可以是活性物质涂层和具有孔隙的绝缘涂层，如陶瓷涂层等；在三种或三种以上涂层时，可以为上述的任意涂层的组合涂层。
其他结构与实施方式一相同，这里不再赘述。
实施方式三
与实施方式一不同的是：本实施方式的位于槽位区3的涂层12形成有槽位6，槽位6包括底部和侧壁，侧壁从底部向上延伸，底部为暴露于极片本体1表面的集流体11，涂层12围成侧壁。其中，槽位6具有四个侧壁，四个侧壁和底部围成槽位6，底部为暴露在外的集流体11，极耳2和该处集流体11焊接。
其他结构与实施方式一相同，这里不再赘述。
电池极片的制备方法
电池极片的制备方法，包括：
将涂层12的浆料涂覆在集流体11上；
将槽位区3的涂层12刮出或激光清洗，形成槽位6；
将减薄区4的涂层12进行减薄，形成减薄部5；
将极片依次经过清洁、辊压和分切，使宽幅的极片分切成多个极片本体1；
将极耳2的端部焊接在槽位6，使得极耳2部分贴近减薄部5。
需要说明的是：通过涂布机，将活性物质浆料涂覆在集流体11上，两面都涂覆，然后经过烘烤干燥后收卷；
参见图5所示，宽幅极片通过激光清洗出槽位6，或通过刮刀方式刮出槽位6，或其他方式形成供极耳2焊接的槽位6；
在制作出槽位6的过程时，可通过激光产生的能量激光聚焦，将集流体11上的涂层物质进行清洗，在清洗出槽位6后，再在槽位6边缘的涂层12上进行再次清洗或刮刀将表层涂层12减薄处理，其中，在激光清洗或刮刀处理的同时增加真空负压除尘装置103，将产生的极片极粉清除掉，对槽位6边缘的涂层12上进行再次清洗的激光功率小于槽位6清洗的激光功率；
其中，参见图7～图8所示，激光清洗的装置包括但不限于从上到下依次设置的激光发射器7、振镜8、场镜9和平台10，激光发射器7内平行设置有全反射镜和输出反射镜，激光依次经过全反射镜和输出反射镜，后经过隔离器射出，隔离器起到保护作用，在工作过程中隔离反射回去的激光，保证光路安全，振镜8对激光反射，可折射不同角度，场镜9控制激光焦距，可控制打标面积，平台10位于最下方，可输送极片到预设位置进行激光清洗。
参见图9所示，刮刀处理包括但不限于刮刀101、风机102、空负压除尘装置103及载台104，刮刀101和载台104可采用钨钢或其他金属制成，极片固定在载台104上，刮刀101垂直于极片，通过来回往复运动刮去涂层12，风机102和空负压除尘装置103位于刮刀101两侧，能够将产生的极片极粉清除掉。
参见图1～图4所示，进行削薄的涂层12可以是极耳2焊接面涂层，也可以是双面涂层，根据实际情况，采用激光清洗或刮刀方式得到的槽位6和减薄处理的涂层12，需经过毛刷再次物理清洁，将表面松动浮尘再次清洗，在经过无尘纸 擦拭工位，将表面粉尘擦掉，避免减薄区涂层12在后工序加工过程掉粉，其中，每个极耳2探出方向的槽位边料减薄长度L：W≤L，每个极耳2探出方向的槽位边料减薄前厚度H控制在20～100um，每个极耳2探出方向的槽位边料减薄厚度h1控制在10～80um，每个极耳2探出方向的槽位边料减薄后厚度h控制在10～50um；可以为极耳2接触面涂层12减薄，也可以为两面涂层12减薄；
参见图5和图6所示，在将极片经过辊压以及分切工序，分切工序将宽幅极片分切成小片极片。
根据上述说明书的揭示和教导，本发明所属领域的技术人员还能够对上述实施方式进行变更和修改。因此，本发明并不局限于上述的具体实施方式，凡是本领域技术人员在本发明的基础上所作出的任何显而易见的改进、替换或变型均属于本发明的保护范围。此外，尽管本说明书中使用了一些特定的术语，但这些术语只是为了方便说明，并不对本发明构成任何限制。

Claims (10)

  1. 一种电池极片，其特征在于，包括极片本体(1)和极耳(2)；
    所述极片本体(1)，包括集流体(11)及涂覆在所述集流体(11)表面的涂层(12)，所述极片本体(1)的表面具有槽位区(3)和减薄区(4)；
    其中，所述集流体(11)暴露于所述极片本体(1)的槽位区(3)表面，且与所述极耳(2)的端部焊接；
    所述涂层(12)暴露于所述极片本体(1)的减薄区(4)表面，且贴近所述极耳(2)。
  2. 如权利要求1所述的一种电池极片，其特征在于：所述极片本体(1)的减薄区(4)位于所述槽位区(3)边缘和所述极片本体(1)边缘之间。
  3. 如权利要求1所述的一种电池极片，其特征在于：在所述极片本体(1)的宽度方向(Y)上，所述槽位区(3)边缘和所述极片本体(1)边缘之间的距离W小于所述减薄区(4)的宽度L，其中，0＜W≤8mm。
  4. 如权利要求1所述的一种电池极片，其特征在于：位于减薄区(4)的所述涂层(12)形成有减薄部(5)，所述极耳(2)贴近所述减薄部(5)，所述减薄部(5)的厚度h为10～50um。
  5. 如权利要求4所述的一种电池极片，其特征在于：位于减薄区(4)所述涂层(12)在减薄前的厚度H为20～100um。
  6. 如权利要求4所述的一种电池极片，其特征在于：位于减薄区(4)所述涂层(12)的减薄厚度h1为10～80um。
  7. 如权利要求1所述的一种电池极片，其特征在于：所述涂层(12)为单层结构或多层结构。
  8. 如权利要求7所述的一种电池极片，其特征在于：所述涂层(12)在其厚度方向包括活性物质层、安全涂层、涂炭涂层及绝缘涂层中的至少一种。
  9. 如权利要求1所述的一种电池极片，其特征在于：位于槽位区(3)的所述 涂层(12)形成有槽位(6)，所述槽位(6)包括底部和侧壁，所述侧壁从所述底部向上延伸，所述底部为暴露于所述极片本体(1)表面的集流体(11)，所述涂层(12)围成所述侧壁。
  10. 一种电池极片的制备方法，其特征在于，包括：
    将涂层(12)的浆料涂覆在集流体(11)上；
    将槽位区(3)的涂层(12)刮出或激光清洗，形成槽位(6)；
    将减薄区(4)的涂层(12)进行减薄，形成减薄部(5)；
    将极片依次经过清洁、辊压和分切；
    将极耳(2)的端部焊接在槽位(6)，使得极耳(2)部分贴近减薄部(5)。
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