WO2020093930A1 - 极片辊压装置及极片辊压方法 - Google Patents

极片辊压装置及极片辊压方法 Download PDF

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Publication number
WO2020093930A1
WO2020093930A1 PCT/CN2019/114757 CN2019114757W WO2020093930A1 WO 2020093930 A1 WO2020093930 A1 WO 2020093930A1 CN 2019114757 W CN2019114757 W CN 2019114757W WO 2020093930 A1 WO2020093930 A1 WO 2020093930A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
heating
cooling
coating film
component
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PCT/CN2019/114757
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English (en)
French (fr)
Inventor
吴志阳
张旺
李世松
郭超
阳超
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP19881943.5A priority Critical patent/EP3799157B1/en
Publication of WO2020093930A1 publication Critical patent/WO2020093930A1/zh
Priority to US17/137,047 priority patent/US11777072B2/en
Priority to US18/234,386 priority patent/US20230411587A1/en

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    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • 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 application relates to the technical field of processing energy storage devices, in particular to a pole piece rolling device and a pole piece rolling method.
  • the preparation process of the cathode and anode pole pieces of the lithium ion battery includes stirring, coating, rolling, slitting, and forming of the tab area to prepare pole pieces that meet the requirements for assembly.
  • the purpose of the rolling is to make the active material and the substrate more tightly bonded and more uniform in thickness, thereby increasing the compact density of the pole piece to increase the energy density of the battery.
  • the structure of the lithium battery roller press usually includes several parts, such as a winding and unwinding system, a deviation correction system, a rolling system, and a thickness measurement system.
  • a composite substrate plastic layer metallized layer
  • the active material is coated at a predetermined position of the composite substrate to form a coated area and a non-coated area.
  • the non-coated area needs to be heated and stretched.
  • the pole piece is wrinkled. volume.
  • the embodiments of the present application provide a pole piece rolling device and a pole piece rolling method, which are used to solve the problem of pole piece wrinkling caused by elastic rebound in the non-coating zone during heating and stretching in the prior art.
  • An embodiment of the present application provides a pole piece rolling device for rolling a pole piece.
  • the pole piece includes a coating film area and a non-coating film area.
  • the pole piece rolling device includes a pressing roller group, a heating component, and a cooling component , The heating component is used to heat the pole piece, and the cooling component is used to cool the pole piece;
  • the heating component further includes a stretching component, and when the heating component heats the pole piece, the stretching component can stretch the non-coating film area;
  • the heating component and the cooling component are used to reduce the difference between the ductility parameter of the non-coating film area and the elongation parameter of the coating film area.
  • the heating component and the cooling component are disposed next to each other.
  • the heating component includes a plurality of first heating units distributed at intervals along the width direction of the pole piece, and the first heating unit is used to directly heat the corresponding non-coating film regions;
  • the cooling component includes a plurality of first cooling units spaced along the width direction of the pole piece, and the first cooling units are used to directly cool the corresponding non-coating regions.
  • the heating component further includes second heating units spaced along the width direction of the pole piece, and the second heating unit is used to directly heat the corresponding coating film area;
  • the cooling component further includes second cooling units spaced along the width direction of the pole piece, and the second cooling unit is used to directly cool the corresponding coating film area.
  • the first heating unit heats the non-coating film area to a first predetermined temperature
  • the second heating unit heats the coating film area to a second predetermined temperature
  • the first predetermined temperature is higher than the second predetermined temperature
  • the first predetermined temperature is between room temperature and 350 ° C
  • the second predetermined temperature is between room temperature and 350 ° C.
  • the heating component is an integrated structure
  • the cooling component has an integrated structure.
  • the heating component includes one or more of a magnetic induction heating component, a hot air heating component, a radiant heating component, an infrared heating component, or a microwave heating component.
  • the cooling component includes one or more of an air cooling component, a cold air box component, or a liquid cooling component.
  • an over-roller is provided between the heating member and the pressing roller group, and a pole piece is wound around the over-roller so that the pole piece is in a position adapted to the heating member.
  • the stretching assembly includes a stretching roller provided downstream of the cooling component and a tension monitoring component, and the control component of the pole piece rolling device can control the tension according to the monitoring result of the tension monitoring component The speed of the extension roller.
  • An embodiment of the present application provides a method for rolling a pole piece, including:
  • the pole piece passes through the pressing roller group
  • the pole piece passes through the heating part to be heated
  • the pole piece passes through the cooling part to be cooled
  • the stretching assembly stretches the non-coated film area of the pole piece.
  • the pole piece passing through the heating part to be heated includes:
  • the pole piece passes through a plurality of first heating units and second heating units to be heated;
  • the first heating unit and the second heating unit are spaced apart along the width direction of the pole piece;
  • the first heating unit is used to directly heat the corresponding non-coating film areas
  • the second heating unit is used to heat the corresponding coating film areas.
  • the pole piece passing through the cooling part to be cooled includes:
  • the pole piece passes through a plurality of first cooling units and second cooling units to be cooled;
  • the first cooling unit and the second cooling unit are spaced apart along the width direction of the pole piece;
  • the first cooling unit is used to directly cool the corresponding non-coating film areas
  • the second cooling unit is used to cool the corresponding coating film areas.
  • the ductility parameter eg, the length of elongation
  • the heating member heats the pole piece and stretches at the same time
  • the ductility parameter of the non-coated area increases, which can reduce the difference in the ductility parameter between the coated area and the non-coated area.
  • the temperature is reduced, so that the elastic rebound of the non-coated film area after stretching is reduced, so that it maintains the stretched state, thereby reducing the elasticity of the non-coated film area
  • the difference between the ductility parameters of the coated and non-coated areas caused by springback can reduce the risk of wrinkling during the stretching of the pole piece, thereby improving the performance of the pole piece and preventing the pole piece from being unable to Winding.
  • FIG. 1 is a schematic diagram of a pole piece rolling device provided in this application in a specific embodiment
  • FIG. 2 is a schematic diagram of the pole piece in FIG. 1.
  • connection refers to two or more; the terms “connection”, “fixed”, etc. should be understood in a broad sense, for example, “connection” may be a fixed connection, a detachable connection, or integrally Connection, or electrical connection; can be directly connected or indirectly connected through an intermediate medium; the term “battery” should also be understood in a broad sense, it can be a battery cell, battery pack, battery module, battery pack.
  • zebra stripe coating is used, that is, the active material is coated at intervals along the width direction of the base material of the pole piece 7 (as shown in FIG. 2), so that the pole piece 7 is in the width
  • the direction W has a coating film region 71 and a non-coating film region 72 distributed at intervals.
  • the non-coated film area 72 of the pole piece 7 is a metal layer coated with a plastic layer.
  • the coating film area 71 Since the thickness of the coating film area 71 is greater than the thickness of the non-coating film area 72, during the rolling process, the coating film area 71 is first rolled, that is, the coating film area 71 stretches (that is, the coating film area 71 stretches during the rolling process), The non-coated area 72 has no extension (the length of the non-coated area 72 is basically unchanged during the rolling process), resulting in a difference in extension between the two (the difference in extension refers to the deformation size or deformation of the coated area 71 and the non-coated area 72) There is a gap in degree).
  • the non-coated film area 72 may be stretched while being rolled, and to improve the ductility of the non-coated film area 72 when stretched (Increase the size of the non-coated film area 72 when stretched), the non-coated film area 72 can be heated while stretching to make it have good ductility, and further reduce the coating film area 71 during the rolling process The difference in extension between the non-coated film region 72, that is, the size difference between the two during rolling is reduced.
  • the non-coated area 72 is a metal layer coated with a plastic layer
  • the plastic layer is prone to elastic rebound after heating and stretching, resulting in a reduction in the elongation dimension of the non-coated area 72 after stretching, resulting in the non-coated area
  • the ductility gap between 72 and the coating film area 71 increases, which in turn causes wrinkles in the pole piece.
  • the present application mainly solves the above technical problem by reducing the difference between the ductility parameters of the coated film area 71 and the non-coated film area 72 of the pole piece 7 during stretching.
  • FIG. 1 is a schematic diagram of a pole piece rolling device provided in this application in a specific embodiment
  • FIG. 2 is a schematic diagram of the pole piece in FIG. 1.
  • the direction indicated by the arrow in FIG. 1 is the movement direction of the pole piece 7 in the pole piece rolling device, and the same direction as the movement direction of the pole piece 7 is the downstream direction, which is opposite to the movement direction of the pole piece 7
  • the direction is upstream.
  • the up-down direction shown in FIG. 2 indicates the length direction (L) of the pole piece 7, that is, the movement direction of the pole piece 7 in FIG. 1, and the left-right direction indicates the width direction (W) of the pole piece 7.
  • the present application provides a pole piece rolling device for processing a pole piece 7 of a lithium battery, wherein, after the pole piece 7 undergoes a coating process, the width direction It includes a coating film area 71 and a non-coating film area 72 distributed at intervals, as shown in FIG. 1, the pole piece rolling device includes a pressing roller group 1, and the pressing roller group 1 includes a matching upper pressing roller 11 and a lower pressing roller 12 During processing, the pole piece 7 that can pass through is rolled.
  • the pole piece rolling device further includes a heating part and a cooling part, wherein the heating part is used to heat the pole piece 7, the cooling part is used to cool the pole piece 7, and the pole piece rolling device In the middle, the pole piece 7 is heated by the heating member, and then enters the cooling member for cooling.
  • the heating component further includes a stretching component. When the heating component heats the pole piece 7, the stretching component can stretch the non-coating film area 72 to have a predetermined size.
  • the above-mentioned heating member and cooling member are used to reduce the difference between the ductility parameter of the non-coating zone 72 and the elongation parameter of the coating zone 71, that is, the extension of the non-coating zone 72 during the rolling process can be reduced The difference between the long dimension and the elongation dimension of the coating film region 71.
  • the ductility parameter (eg, the length of elongation) of the coating film area 71 is greater than the ductility parameter of the non-coating film area 72, and when the heating member heats the pole piece, at the same time
  • the ductility parameter of the non-coated film area 72 increases, which can reduce the difference in the ductility parameter between the coated film area 71 and the non-coated film area 72.
  • the temperature is reduced, so that the degree of elastic rebound of the non-coated film area 72 after stretching is reduced, which keeps it in a stretched state, thereby reducing the non-coated film area 72
  • the difference between the ductility parameters of the coated film area 71 and the non-coated film area 72 caused by the elastic rebound can reduce the risk of wrinkling during the stretching of the pole piece 7, thereby improving the performance of the pole piece 7 and preventing the pole piece 7 Unable to wind up due to wrinkles.
  • the elastic modulus of the uncoated region 72 in this part decreases, which acts on the tensile force of the tensile assembly
  • the non-coated film area 72 is plastically deformed, while the non-coated film area 72 at other locations can only produce elastic deformation under the same amount of tensile force, or the amount of deformation is small; the non-coated film that undergoes large plastic deformation
  • the elastic modulus becomes large, and only elastic deformation or deformation amount can occur.
  • this part of the uncoated film region 72 between the heating member 2 and the cooling member 3 can undergo significant tensile deformation, that is, after the heating member 2 and the cooling member 3 are provided, not only can the risk of wrinkling of the pole piece 7 be reduced, but also It contributes to the stretching of the pole piece 7.
  • the heating component 2 is used to heat the uncoated film regions 72, that is, the uncoated film regions 72 distributed at intervals in the width direction
  • the temperature of the coating film area 71 does not change (the temperature of the coating film area 71 does not change means that the heating member 2 does not directly heat the coating film area 71, but due to There is thermal conduction between the coating film area 71 and the non-coating film area 72, and the coating film area 71 also has a certain temperature increase). Therefore, the heating member 2 includes the width direction of the pole piece 7 (the width direction shown in FIG. 2) ) A plurality of first heating units distributed at intervals, each of the first heating units is disposed corresponding to each non-coating film area 72, so as to directly heat each non-coating film area 72.
  • the cooling member 3 is used to cool the non-coated film area 72, that is, the non-coated film area 72 and the coated film area 71 that are spaced apart in the width direction, only the temperature of the non-coated film area 72 is reduced, the coating The temperature of the film region 71 does not decrease (the cooling member 3 does not directly cool the coating film region 71, but due to the heat conduction between the coating film region 71 and the non-coating film region 72, the coating film region 71 also has a certain temperature drop). Therefore, the cooling member 3 is spaced along the width direction of the pole piece 7 (the width direction as shown in FIG. 2), a plurality of first cooling units, each of the first cooling units is provided corresponding to the non-coating area 72 for direct cooling Each non-coating area 72.
  • the heating component 2 can be used to heat the non-coating film area 72 and the coating film area 71
  • the cooling component 3 can be used to cool the non-coating film area 72 and the coating film area 71
  • the heating component 2 further includes an edge piece 7 are a plurality of second heating units distributed at intervals in the width direction, and each second heating unit is disposed corresponding to each coating film region 71 so as to directly heat the coating film region 71. Therefore, in this embodiment, the heating member 2 includes a first heating unit and a second heating unit distributed at intervals in the width direction of the pole piece 7.
  • the cooling member 3 further includes a plurality of second cooling units distributed at intervals, and each second cooling unit is disposed corresponding to each coating film area 71 so as to directly cool the coating film area 71. Therefore, in this embodiment, the cooling member 3 includes the first cooling unit and the second cooling unit distributed at intervals in the width direction of the pole piece 7.
  • the first heating unit heats the non-coating film area 72 to a first predetermined temperature
  • the second heating unit heats the coating film area 71 to a second predetermined temperature
  • the first predetermined temperature is higher than the second Predetermined temperature.
  • the first predetermined temperature is between room temperature and 350 ° C
  • the second predetermined temperature is between room temperature and 350 ° C.
  • the heating member 2 includes the first heating unit and the second heating unit distributed at intervals, the temperature of the coating film region 71 and the non-coating film region 72 can be flexibly controlled, that is, the two can have different temperatures after being heated, so that Flexible adjustment of the two ductility parameters to reduce the difference between the two ductility parameters.
  • the heating member 2 has an integrated structure, that is, when the pole piece 7 passes, the heating member 2 can simultaneously heat the non-coating film area 72 and the coating film area 71.
  • the cooling element 3 can also With an integrated structure, when the pole piece 7 passes, the cooling member 3 can simultaneously cool the non-coating film area 72 and the coating film area 71.
  • the heating member 2 heats the passing uncoated film area 72 and the coated film area 71 to the same temperature, therefore, the elastic modulus of both is reduced and the ductility is improved.
  • the uncoated film due to the uncoated film
  • a plurality of passing rollers are provided between the heating member 2 and the pressing roller group 1, and the pole piece 7 is wound around each passing roller, so that the pole piece 7 is in a position adapted to the heating member 2.
  • the first passing roller 4 and the second passing roller 5 are provided between the heating member 2 and the pressing roller group 1, and after the pole piece 7 passes the second passing roller 5, the horizontal The direction passes through the heating member 5, making the arrangement of the heating member 5 more convenient. Therefore, by providing the passing roller, the moving direction and position of the pole piece 7 can be adjusted.
  • the inlet and outlet of the heating component 2 and the inlet and outlet of the cooling component 3 can be provided with rollers, so as to adjust the movement direction of the substrate 7 so that the substrate 7 can be adapted to the heating component 2 and the cooling component 3 to achieve Heating and cooling.
  • the stretching assembly may include several stretching rollers provided downstream of the cooling member 3, and each stretching roller can apply tension to the upstream pole piece 7. In this way, the uncoated film region 72 and the coated film region 71 between the heating member 2 and the cooling member 3 are stretched.
  • the stretching assembly may further include a tension monitoring component for monitoring the tension of the pole piece 7 upstream of the stretching assembly.
  • the pole piece rolling device further includes a control component for controlling the opening, closing and running speed of each component, for example, the control component can control the rotation speed of the upper and lower pressure rollers 11 and 12, the rotation speed of each passing roller, heating The predetermined heating temperature of the first heating unit and the second heating unit in the component 2 and the predetermined cooling temperature of the first cooling unit and the second cooling unit in the cooling component 3.
  • the control part can also control the rotation speed of the stretching roller by the monitoring result of the tension monitoring part.
  • the rotation speed of the stretching roller is controlled to increase the tension of the pole piece 7 and increase the tensile force applied to the pole piece 7; when the control part judges When the tension of the pole piece 7 monitored by the tension monitoring part is too large, the rotation speed of the stretching roller is controlled to decrease to reduce the tension of the pole piece 7 and the tensile force applied to the pole piece 7.
  • a third passing roller 6 is provided between the cooling member 3 and the stretching assembly.
  • the heating component 2 may be one or more of a magnetic induction heating component, a hot air heating component, a radiant heating component, an infrared heating component, and a microwave heating component, as long as the non-coating film region 72 can be heated to a predetermined temperature That's it.
  • the cooling member 3 may be one or more of an air-cooled member, a cold-air box member, and a liquid cooling member, as long as it can cool the non-coating zone 72 to a predetermined temperature.
  • the specific structures of the heating member and the cooling member are not limited.
  • An embodiment of the present application provides a method for rolling a pole piece, including: a pole piece passing through a pressing roller group; a pole piece passing through a heating part to be heated; a pole piece passing through a cooling part to be cooled; and performing a pole piece on the heating part When heated, the stretching assembly stretches the non-coating area of the pole piece.
  • the pole piece passes through the heating part to be heated includes: the pole piece passes through a plurality of first heating units and second heating units to be heated; the first heating unit and the second heating unit are along the width direction of the pole piece Space distribution; the first heating unit is used to directly heat the corresponding non-coating film area, and the second heating unit is used to heat the corresponding coating film area.
  • the pole piece passes through the cooling part to be cooled comprises: the pole piece passes through a plurality of first cooling units and second cooling units to be cooled; the first cooling unit and the second cooling unit are along the width direction of the pole piece Interval distribution; the first cooling unit is used to directly cool the corresponding non-coating film area, and the second cooling unit is used to cool the corresponding coating film area.

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  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
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  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)
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Abstract

本申请提供一种极片辊压装置及极片辊压方法，用于辊压极片，极片包括涂膜区和非涂膜区，极片辊压装置包括压辊组、加热部件和冷却部件，加热部件用于加热极片，冷却部件用于冷却极片；加热部件还包括拉伸组件，当加热部件对极片进行加热时，拉伸组件能够对非涂膜区进行拉伸；极片经过加热部件后，再经过冷却部件；加热部件与冷却部件，用于减小非涂膜区的延展性参数与涂膜区的延长性参数之间的差值。当该极片经过加热部件后再经过冷却部件时，温度降低，使得拉伸后的非涂膜区弹性回弹程度减小，使其保持拉伸状态，从而降低涂膜区与非涂膜区延展性参数的差值，降低极片拉伸过程中皱褶的风险，提高极片的性能，并防止极片因存在皱褶而无法收卷。

Description

极片辊压装置及极片辊压方法
本申请要求于2018年11月09日提交中国专利局、申请号为201821846114.8、发明名称为“极片辊压装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及储能器件加工技术领域，尤其涉及一种极片辊压装置及极片辊压方法。
背景技术
目前，锂离子电池阴阳极极片制备工艺包括搅拌、涂布、辊压、分条、极耳区成型等工序，以制备出满足用于装配要求的极片。辊压的目的在于使活性物质与基材结合更加紧密、厚度更加均匀，从而提升极片的压实密度以提高电池能量密度。锂电池辊压机的结构通常包括收放卷系统，纠偏系统，轧制系统，测厚系统等几部分。
目前，采用复合基材(塑料层镀金属层)代替铜箔(或铝箔)基材，且在复合基材的预定位置涂布活性物质，形成涂布区和非涂布区。在辊压过程中，需对非涂布区进行加热拉伸，但是，由于非涂布区的塑料层加热后会发生弹性回弹现象，导致极片存在褶皱，褶皱严重时导致极片无法收卷。
申请内容
有鉴于此，本申请实施例提供了一种极片辊压装置及极片辊压方法，用以解决现有技术中加热拉伸时非涂布区因弹性回弹导致的极片褶皱问题。
本申请实施例提供了一种极片辊压装置，用于辊压极片，极片包括涂膜区和非涂膜区，所述极片辊压装置包括压辊组、加热部件和冷却部件，所述加热部件用于加热极片，所述冷却部件用于冷却极片；
所述加热部件还包括拉伸组件，当所述加热部件对极片进行加热时，所述拉伸组件能够对非涂膜区进行拉伸；
极片经过所述加热部件后，再经过所述冷却部件；
所述加热部件与所述冷却部件，用于减小非涂膜区的延展性参数与涂膜区的延长性参数之间的差值。
优选地，所述加热部件与所述冷却部件相互紧邻设置。
优选地，所述加热部件包括沿极片的宽度方向间隔分布的多个第一加热单元，所述第一加热单元用于直接加热对应的各非涂膜区；
所述冷却部件包括沿极片的宽度方向间隔分布的多个第一冷却单元，所述第一冷却单元用于直接冷却对应的各非涂膜区。
优选地，所述加热部件还包括沿极片的宽度方向间隔分布的第二加热单元，所述第二加热单元用于直接加热对应的涂膜区；
所述冷却部件还包括沿极片的宽度方向间隔分布的第二冷却单元，所述第二冷却单元用于直接冷却对应的涂膜区。
优选地，所述第一加热单元将非涂膜区加热至第一预定温度，所述第二加热单元将涂膜区加热至第二预定温度；
所述第一预定温度高于所述第二预定温度；
所述第一预定温度在室温至350℃之间，所述第二预定温度在室温至350℃之间。
优选地，所述加热部件为一体式结构；
所述冷却部件为一体式结构。
优选地，所述加热部件包括磁感应加热部件、热风加热部件、辐射加热部件、红外加热部件或微波加热部件中的一种或多种。
优选地，所述冷却部件包括风冷部件、冷风箱部件或液体冷却部件中的一种或多种。
优选地，所述加热部件与所述压辊组之间设置有过辊，极片绕于所述过辊，以使极片处于与加热部件相适配的位置。
优选地，所述拉伸组件包括设于所述冷却部件下游的拉伸辊以及张力监测部件，所述极片辊压装置的控制部件能够根据所述张力监测部件的监测结果，控制所述拉伸辊的转速。
本申请实施例提供了一种极片辊压方法，包括：
极片通过压辊组；
极片经过加热部件以被加热；
极片经过冷却部件以被冷却；
在所述加热部件对极片进行加热时，拉伸组件对极片的非涂膜区进行拉伸。
优选地，极片经过加热部件以被加热包括：
极片经过多个第一加热单元和第二加热单元以被加热；
所述第一加热单元和所述第二加热单元沿极片的宽度方向间隔分布；
所述第一加热单元用于直接加热对应的各非涂膜区，所述第二加热单元用于加热对应的涂膜区。
优选地，极片经过冷却部件以被冷却包括：
极片经过多个第一冷却单元和第二冷却单元以被冷却；
所述第一冷却单元和所述第二冷却单元沿极片的宽度方向间隔分布；
所述第一冷却单元用于直接冷却对应的各非涂膜区，所述第二冷却单元用于冷却对应的涂膜区。
本申请提供的技术方案可以达到以下有益效果：
本申请中，在辊压过程中，由于厚度的差异，涂膜区的延展性参数(例如伸长的长度)大于非涂膜区的延展性参数，且当加热部件加热极片、同时拉伸非涂膜区时，由于温度升高，非涂膜区的延展性参数增大，能够减小涂膜区与非涂膜区之间延展性参数的差距。同时，当该极片经过加热部件后再经过冷却部件时，温度降低，使得拉伸后的非涂膜区弹性回弹程度减小，使其保持拉伸状态，从而降低因非涂膜区弹性回弹而导致的涂膜区与非涂膜区延展性参数的差值，能够降低极片拉伸过程中皱褶的风险，进而提高极片的性能，并防止极片因存在皱褶而无法收卷。
附图说明
图1为本申请所提供极片辊压装置在一种具体实施例中的示意图；
图2为图1中极片的示意图。
附图标记：
1  压辊组
11  上压辊
12  下压辊
2  加热部件
3  冷却部件
4  第一过辊
5  第二过辊
6  第三过辊
7  极片
71  涂膜区
72  非涂膜区
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。
具体实施方式
下面通过具体的实施例并结合附图对本申请做进一步的详细描述。
在本申请的描述中，除非另有明确的规定和限定，术语“第一”、“第二”仅用于描述的目的，而不能理解为指示或暗示相对重要性；除非另有规定或说明，术语“多个”是指两个或两个以上；术语“连接”、“固定”等均应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或一体地连接，或电连接；可以是直接相连，也可以通过中间媒介间接相连；术语“电池”也应做广义理解，可以是电池单体、电池组、电池模块、电池包。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。
本说明书的描述中，需要理解的是，本申请实施例所描述的“上”、“下”、“左”、“右”等方位词是以附图所示的角度来进行描述的，不应理解为对本申请实施例的限定。此外，在上下文中，还需要理解的是， 当提到一个元件连接在另一个元件“上”或者“下”时，其不仅能够直接连接在另一个元件“上”或者“下”，也可以通过中间元件间接连接在另一个元件“上”或者“下”。
锂电池极片生产过程中，为了提高生产效率，采用斑马条纹涂布，即沿极片7基材的宽度方向(如图2所示)间隔涂布活性物质，从而使得该极片7在宽度方向W上具有间隔分布的涂膜区71和非涂膜区72。且采用复合基材代替金属基材时，该极片7的非涂膜区72为塑料层镀金属层。
由于涂膜区71的厚度大于非涂膜区72的厚度，辊压过程中，首先辊压涂膜区71，即涂膜区71发生延展(即辊压过程中涂膜区71伸长)，而非涂膜区72无延展(辊压过程中非涂膜区72长度基本不变)，导致二者存在延展差(延展差指的是涂膜区71与非涂膜区72变形尺寸或变形程度有差距)。为了减小辊压过程中涂膜区71与非涂膜区72的延展差，可在辊压的同时拉伸非涂膜区72，且为了提高该非涂膜区72拉伸时的延展性(增大非涂膜区72拉伸时伸长的尺寸)，可在拉伸的同时加热非涂膜区72，以使其具有良好的延展性，进一步减小辊压过程中涂膜区71与非涂膜区72之间的延展差，即二者辊压过程中伸长的尺寸差距减小。
但是，由于非涂膜区72为塑料层镀金属层，加热拉伸后塑料层容易发生弹性回弹现象，导致非涂膜区72拉伸后的伸长尺寸减小，从而导致非涂膜区72与涂膜区71之间的延展性差距增大，进而导致极片存在褶皱。
本申请主要通过减小拉伸时极片7的涂膜区71与非涂膜区72延展性参数之间的差值，来解决上述技术问题。
请参考附图1和2，其中，图1为本申请所提供极片辊压装置在一种具体实施例中的示意图；图2为图1中极片的示意图。
需要说明的是，图1中箭头所示的方向为极片7在极片辊压装置中的运动方向，且与极片7运动方向相同的方向为下游方向，与极片7运动方向相反的方向为上游方向。同时，图2所示的上下方向表示极片7的长度方向(L)，也即图1种极片7的运动方向，左右方向表示极片7的宽度方向(W)。
在一种具体实施例中，本申请提供一种极片辊压装置，该极片辊压装置用于加工锂电池的极片7，其中，该极片7经涂布工艺后，沿宽度方向包 括间隔分布的涂膜区71和非涂膜区72，如图1所示，极片辊压装置包括压辊组1，压辊组1包括相适配的上压辊11和下压辊12，加工时，能够轧制通过的极片7。
同时，如图1所示，该极片辊压装置还包括加热部件和冷却部件，其中，加热部件用于加热极片7，冷却部件用于冷却极片7，且在该极片辊压装置中，极片7经过加热部件进行加热后，再进入冷却部件进行冷却。且该加热部件还包括拉伸组件，当加热部件对极片7进行加热时，该拉伸组件能够对非涂膜区72进行拉伸，以使其具有预定的尺寸。上述加热部件与冷却部件，用于减小非涂膜区72的延展性参数与涂膜区71的延长性参数之间的差值，即能够减小辊压过程中非涂膜区72的伸长尺寸与涂膜区71的伸长尺寸之间的差值。
本申请中，在辊压过程中，由于厚度的差异，涂膜区71的延展性参数(例如伸长的长度)大于非涂膜区72的延展性参数，且当加热部件加热极片、同时拉伸非涂膜区72时，由于温度升高，非涂膜区72的延展性参数增大，能够减小涂膜区71与非涂膜区72之间延展性参数的差距。同时，当该极片经过加热部件后再经过冷却部件时，温度降低，使得拉伸后的非涂膜区72弹性回弹程度减小，使其保持拉伸状态，从而降低因非涂膜区72弹性回弹而导致的涂膜区71与非涂膜区72延展性参数的差值，能够降低极片7拉伸过程中皱褶的风险，进而提高极片7的性能，并防止极片7因存在皱褶而无法收卷。
同时，本实施例中，设置加热部件2与冷却部件3后，因为二者之间的极片7温度上升，使得该部分非涂膜区72弹性模量减小，在拉伸组件的拉力作用下，该部分非涂膜区72产生塑性变形，而其它位置的非涂膜区72在相同大小的拉力作用下只能产生弹性变形，或者变形量较小；发生较大塑性变形的非涂膜区72经过冷却部件3时，弹性模量变大，只能发生弹性变形或变形量减小。因此，加热部件2和冷却部件3之间的该部分非涂膜区72能够发生明显拉伸变形，即设置加热部件2和冷却部件3后，不仅能够降低极片7发生褶皱的风险，还有助于极片7的拉伸成型。
具体地，在第一种具体实施例中，极片7运动过程中，如图2所示，该 加热部件2用于加热非涂膜区72，即沿宽度方向间隔分布的非涂膜区72与涂膜区71中，仅非涂膜区72的温度升高，涂膜区71的温度未改变(涂膜区71温度未改变指的是加热部件2未直接加热涂膜区71，但由于涂膜区71与非涂膜区72之间存在热传导，涂膜区71也存在一定程度的升温)，因此，该加热部件2包括沿极片7的宽度方向(如图2所示的宽度方向)间隔分布的多个第一加热单元，各第一加热单元与各非涂膜区72对应设置，以便直接加热各非涂膜区72。
同样地，该实施例中，冷却部件3用于冷却非涂膜区72，即沿宽度方向间隔分布的非涂膜区72与涂膜区71中，仅非涂膜区72的温度降低，涂膜区71的温度未降低(冷却部件3未直接冷却涂膜区71，但由于涂膜区71与非涂膜区72之间存在热传导，涂膜区71也存在一定程度的降温)。因此，该冷却部件3沿极片7的宽度方向(如图2所示的宽度方向)间隔分布的多个第一冷却单元，各第一冷却单元与非涂膜区72对应设置，以便直接冷却各非涂膜区72。
进一步地，该加热部件2可用于加热非涂膜区72和涂膜区71，冷却部件3可用于冷却非涂膜区72和涂膜区71，具体地，该加热部件2还包括沿极片7的宽度方向间隔分布的若干第二加热单元，且各第二加热单元与各涂膜区71对应设置，以便直接加热涂膜区71。因此，该实施例中，加热部件2包括沿极片7的宽度方向间隔分布的第一加热单元和第二加热单元。
同时，冷却部件3还包括间隔分布的若干第二冷却单元，各第二冷却单元与各涂膜区71对应设置，以便直接冷却涂膜区71。因此，该实施例中，冷却部件3包括沿极片7的宽度方向间隔分布的第一冷却单元和第二冷却单元。
具体地，本实施例中，第一加热单元将非涂膜区72加热至第一预定温度，第二加热单元将涂膜区71加热至第二预定温度，且第一预定温度高于第二预定温度。其中，该第一预定温度在室温至350℃之间，第二预定温度在室温至350℃之间。
因此，加热部件2包括间隔分布的第一加热单元和第二加热单元时，能够灵活控制涂膜区71与非涂膜区72的温度，即能够使得二者加热后具有 不同的温度，从而能够灵活调整二者的延展性参数，降低二者延展性参数的差值。
在另一种具体实施例中，加热部件2为一体式结构，即极片7通过时，该加热部件2能够同时加热非涂膜区72和涂膜区71，同样地，冷却部件3也可为一体式结构，极片7通过时，该冷却部件3能够同时冷却非涂膜区72和涂膜区71。
本实施例中，加热部件2将经过的非涂膜区72和涂膜区71加热至相同的温度，因此，二者的弹性模量均减小，延展性均提高，但是，由于非涂膜区72和涂膜区71材料性质的区别，当二者具有相同、较高的温度时，非涂膜区72的弹性模量减小量较小，因此，其延展性参数的增加量较小，从而能够减小非涂膜区72与涂膜区71之间延展性参数的差值。
以上各实施例中，加热部件2与压辊组1之间设置有若干过辊，极片7绕于各过辊，以使极片7处于与加热部件2相适配的位置。
如图1所示的实施例中，加热部件2与压辊组1之间设置有第一过辊4与第二过辊5，且极片7经过第二过辊5后，以近似水平的方向经过加热部件5，使得加热部件5的布置更加方便。因此，通过设置过辊，能够调整极片7的运动方向和位置。
同时，加热部件2的入口和出口、冷却部件3的入口和出口均可设置过辊，以便调整基材7的运动方向，以使基材7能够与加热部件2和冷却部件3适配，实现加热和冷却。
另一方面，上述各实施例中，拉伸组件(图1中未示出)可包括设于冷却部件3下游的若干拉伸辊，各拉伸辊能够对其上游的极片7施加拉力，以使加热部件2与冷却部件3之间的非涂膜区72和涂膜区71被拉伸。同时，该拉伸组件还可包括张力监测部件，用于监测该拉伸组件上游的极片7的张力。
该极片辊压装置还包括控制部件，用于控制各部件的开启、关闭和运行速度，例如，该控制部件能够控制上压辊11和下压辊12的转速、各过辊的转速、加热部件2中第一加热单元和第二加热单元预定加热温度以及冷却部件3中第一冷却单元和第二冷却单元的预定冷却温度。同时，该控制 部件还能够张力监测部件的监测结果控制拉伸辊的转速。
当控制部件判断张力监测部件监测到的极片7的张力较小时，控制拉伸辊转速增大，以增大极片7的张力，并增大施加于极片7的拉力；当控制部件判断张力监测部件监测到的极片7的张力过大时，控制拉伸辊转速减小，以减小极片7的张力和施加于极片7的拉力。
同时，图1所示的实施例中，冷却部件3与拉伸组件之间设置有第三过辊6。
以上各实施例中，加热部件2可为磁感应加热部件、热风加热部件、辐射加热部件、红外加热部件、微波加热部件中的一种或多种，只要能够将非涂膜区72加热到预定温度即可。另外，冷却部件3可为风冷部件、冷风箱部件、液体冷却部件中的一种或多种，只要能够将非涂膜区72冷却到预定温度即可。
因此，本申请中，对加热部件和冷却部件的具体结构不作限定。
本申请实施例提供了一种极片辊压方法，包括：极片通过压辊组；极片经过加热部件以被加热；极片经过冷却部件以被冷却；在所述加热部件对极片进行加热时，拉伸组件对极片的非涂膜区进行拉伸。
优选地，极片经过加热部件以被加热包括：极片经过多个第一加热单元和第二加热单元以被加热；所述第一加热单元和所述第二加热单元沿极片的宽度方向间隔分布；所述第一加热单元用于直接加热对应的各非涂膜区，所述第二加热单元用于加热对应的涂膜区。
优选地，极片经过冷却部件以被冷却包括：极片经过多个第一冷却单元和第二冷却单元以被冷却；所述第一冷却单元和所述第二冷却单元沿极片的宽度方向间隔分布；所述第一冷却单元用于直接冷却对应的各非涂膜区，所述第二冷却单元用于冷却对应的涂膜区。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (13)

  1. 一种极片辊压装置，用于辊压极片，极片包括涂膜区和非涂膜区，其特征在于，所述极片辊压装置包括压辊组、加热部件和冷却部件，
    所述加热部件用于加热极片，所述冷却部件用于冷却极片；
    所述加热部件还包括拉伸组件，当所述加热部件对极片进行加热时，所述拉伸组件能够对非涂膜区进行拉伸；
    极片经过所述加热部件后，再经过所述冷却部件；
    所述加热部件与所述冷却部件，用于减小非涂膜区的延展性参数与涂膜区的延长性参数之间的差值。
  2. 根据权利要求1所述的极片辊压装置，其特征在于，所述加热部件与所述冷却部件相互紧邻设置。
  3. 根据权利要求2所述的极片辊压装置，其特征在于，所述加热部件包括沿极片的宽度方向间隔分布的多个第一加热单元，所述第一加热单元用于直接加热对应的各非涂膜区；
    所述冷却部件包括沿极片的宽度方向间隔分布的多个第一冷却单元，所述第一冷却单元用于直接冷却对应的各非涂膜区。
  4. 根据权利要求3所述的极片辊压装置，其特征在于，所述加热部件还包括沿极片的宽度方向间隔分布的第二加热单元，所述第二加热单元用于直接加热对应的涂膜区；
    所述冷却部件还包括沿极片的宽度方向间隔分布的第二冷却单元，所述第二冷却单元用于直接冷却对应的涂膜区。
  5. 根据权利要求4所述的极片辊压装置，其特征在于，所述第一加热单元将非涂膜区加热至第一预定温度，所述第二加热单元将涂膜区加热至第二预定温度；
    所述第一预定温度高于所述第二预定温度；
    所述第一预定温度在室温至350℃之间，所述第二预定温度在室温至350℃之间。
  6. 根据权利要求1所述的极片辊压装置，其特征在于，所述加热部件为一体式结构；
    所述冷却部件为一体式结构。
  7. 根据权利要求1～6中任一项所述的极片辊压装置，其特征在于，所述加热部件包括磁感应加热部件、热风加热部件、辐射加热部件、红外加热部件或微波加热部件中的一种或多种。
  8. 根据权利要求1～6中任一项所述的极片辊压装置，其特征在于，所述冷却部件包括风冷部件、冷风箱部件或液体冷却部件中的一种或多种。
  9. 根据权利要求1～6中任一项所述的极片辊压装置，其特征在于，所述加热部件与所述压辊组之间设置有过辊，极片绕于所述过辊，以使极片处于与加热部件相适配的位置。
  10. 根据权利要求1～6中任一项所述的极片辊压装置，其特征在于，所述拉伸组件包括设于所述冷却部件下游的拉伸辊以及张力监测部件，所述极片辊压装置的控制部件能够根据所述张力监测部件的监测结果，控制所述拉伸辊的转速。
  11. 一种极片辊压方法，其特征在于，包括：
    极片通过压辊组；
    极片经过加热部件以被加热；
    极片经过冷却部件以被冷却；
    在所述加热部件对极片进行加热时，拉伸组件对极片的非涂膜区进行拉伸。
  12. 根据权利要求11所述的极片辊压方法，其特征在于，极片经过加热部件以被加热包括：
    极片经过多个第一加热单元和第二加热单元以被加热；
    所述第一加热单元和所述第二加热单元沿极片的宽度方向间隔分布；
    所述第一加热单元用于直接加热对应的各非涂膜区，所述第二加热单元用于加热对应的涂膜区。
  13. 根据权利要求11所述的极片辊压方法，其特征在于，极片经过冷却部件以被冷却包括：
    极片经过多个第一冷却单元和第二冷却单元以被冷却；
    所述第一冷却单元和所述第二冷却单元沿极片的宽度方向间隔分布；
    所述第一冷却单元用于直接冷却对应的各非涂膜区，所述第二冷却单元用于冷却对应的涂膜区。
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