WO2023071708A1 - 涂布挤压头及涂布装置 - Google Patents

涂布挤压头及涂布装置 Download PDF

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Publication number
WO2023071708A1
WO2023071708A1 PCT/CN2022/123257 CN2022123257W WO2023071708A1 WO 2023071708 A1 WO2023071708 A1 WO 2023071708A1 CN 2022123257 W CN2022123257 W CN 2022123257W WO 2023071708 A1 WO2023071708 A1 WO 2023071708A1
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WO
WIPO (PCT)
Prior art keywords
extrusion head
coating
pressure regulating
slurry
pressure
Prior art date
Application number
PCT/CN2022/123257
Other languages
English (en)
French (fr)
Inventor
刘阳
车欢
李世松
倾亚龙
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 EP22885591.2A priority Critical patent/EP4265342A1/en
Publication of WO2023071708A1 publication Critical patent/WO2023071708A1/zh
Priority to US18/222,483 priority patent/US20230356258A1/en

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Classifications

    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it
    • 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
    • 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 battery substrate coating, in particular to a coating extrusion head and a coating device.
  • Coating is an essential process in the battery production process, and is mainly used in the production of battery pole pieces.
  • Coating in pole piece production refers to the process of uniformly, continuously or intermittently coating the prepared paste-like viscous slurry on the pole piece. It is necessary to ensure that the thickness of each coating position of the pole piece is consistent, and the coating thickness is controlled within the tolerance range required by the process. The quality of coating directly affects various performances such as battery safety, capacity and consistency.
  • the slurry in the coating area is not uniform, which affects the quality of the battery.
  • One of the purposes of the embodiments of the present application is to provide a cloth extrusion head and a coating device, which can solve the problem of non-uniform slurry in the coating area when the existing coating extrusion head is coating.
  • a coating extrusion head in the first aspect, includes an extrusion head body and at least one pressure regulating assembly.
  • the interior of the extrusion head body is provided with an accommodating cavity, and the extrusion head body is also provided with The coating slit communicated with the accommodating cavity, at least one pressure regulating assembly is disposed in the accommodating cavity, and the pressure regulating assembly is configured to expand and contract along a first direction perpendicular to the coating slit.
  • the pressure regulating assembly includes a telescopic device and a pressure sensor, the pressure sensor is arranged on the surface of the telescopic device, the pressure sensor is used to detect the pressure on the surface of the telescopic device and transmit the pressure signal to an external control system, and the telescopic device is configured as Scaling is performed according to the control signal of the control system.
  • the pressure regulating assembly further includes a wireless signal transceiver configured to transmit the pressure signal of the pressure sensor to an external control system in a wireless transmission manner, and the wireless signal transceiver is also configured to receive an external Control the control signal sent by the system and transmit the control signal to the telescopic device.
  • the telescopic device is a piezoelectric drive.
  • the extrusion head body further includes an elastic protective film disposed in the accommodating cavity, and the elastic protective film covers at least one pressure regulating component and elastically deforms as the pressure regulating component expands and contracts.
  • the elastic protective film is a carbon fiber film or a tetrafluoroethylene film.
  • the extrusion head body includes an upper extrusion head and a lower extrusion head, the upper extrusion head is fastened on the upper part of the lower extrusion head, and the upper extrusion head and the lower extrusion head jointly define an accommodation cavity.
  • the coating extrusion head further includes a sealing gasket, and the sealing gasket is arranged at the contact portion of the upper extrusion head and the lower extrusion head.
  • the lower extrusion head is provided with a groove, and the upper extrusion head is fastened on the lower extrusion head to close the groove to form a receiving cavity.
  • the extrusion head body further includes a fastener
  • the upper extrusion head is provided with a first installation hole
  • the lower extrusion head is provided with a second installation hole
  • the fastener passes through the first installation hole and the second installation hole. Holes are installed to securely connect the upper extrusion head and the lower extrusion head.
  • the coating slit is arranged between the upper extrusion head and the lower extrusion head, and the surface of the upper extrusion head near the coating slit and the surface of the lower extrusion head near the coating slit are provided with layer of wear-resistant material.
  • the wear-resistant material layer is a ceramic layer or a silicon carbide layer.
  • the edge of the upper extrusion head is provided with a handle portion for grasping.
  • a coating device including the coating extrusion head in any one of the above embodiments.
  • the beneficial effect of the coating extrusion head is that at least one pressure regulating assembly is arranged in the accommodation chamber, and the pressure regulating assembly can expand and contract along the direction perpendicular to the coating slit, so as to adjust the pressure of the accommodation chamber. Volume, so as to change the flow rate of the slurry in the accommodating cavity.
  • the shrinkage of the pressure regulating component can be controlled to increase the volume of the accommodating cavity, so that The flow rate of the slurry in the accommodating cavity will be reduced, so that the weight of the slurry sprayed onto the coating single point or local area can be reduced; when the slurry weight of the coating single point or local area is too small, it can be controlled
  • the pressure regulating assembly protrudes to reduce the volume of the accommodating chamber, so that the flow rate of the slurry in the accommodating chamber will increase, so that the weight of the slurry sprayed to the coating single point or local area can be increased.
  • the beneficial effect of the coating device provided by the embodiment of the present application is that: since it has the coating extrusion head in the embodiment of the first aspect, at least one pressure regulating assembly is arranged in the accommodation cavity of the coating extrusion head, The expansion and contraction of the pressure regulating component along the direction perpendicular to the coating slit can adjust the volume of the accommodation chamber, thereby changing the flow rate of the slurry in the accommodation chamber, so as to control the coating extrusion head to coat a single point or a local area during coating. The weight of the slurry to make the weight of the coated slurry balanced and stable. Therefore, the coating device in the embodiment of the present application can also solve the problem of unbalanced and unstable slurry weight in a single point or a local area when the existing coating extrusion head is coating.
  • FIG. 1 is a schematic structural view of a coating extrusion head in an embodiment of the present application.
  • Fig. 2 is a structural schematic diagram of the lower extrusion head and the pressure regulating assembly of the coating extrusion head in the embodiment of the present application.
  • Fig. 3 is a schematic structural view of the lower extrusion head of the coating extrusion head in the embodiment of the present application.
  • Fig. 4 is a schematic structural view of the upper extrusion head of the coating extrusion head in the embodiment of the present application.
  • Fig. 5 is a front view of a coating extrusion head in an embodiment of the present application.
  • Fig. 6 is a side view of the coating extrusion head in the embodiment of the present application.
  • Fig. 7 is a structural schematic diagram of the pressure regulating assembly of the coating extrusion head in the embodiment of the present application.
  • extrusion head body 110, upper extrusion head; 111, groove; 112, grip part; 113, first installation hole; 120, lower extrusion head; 121, second installation hole; 130, elastic protective film ; 140, gasket;
  • Coating is an indispensable process in the production process of lithium-ion batteries, and it is also a key process that directly affects various performances such as battery safety, capacity and consistency. Coating is to coat the prepared battery slurry on the substrate (aluminum foil or copper foil) evenly, continuously or intermittently, to ensure the thickness consistency of each coating position, and to control the coating thickness to the required level of the process. within the tolerance range.
  • Transfer coating is a mature technology, but its structure is complex and equipment debugging is cumbersome. Moreover, the slurry for transfer coating is in a bare state (that is, the slurry is exposed to the air), and it is difficult to guarantee the performance of the slurry.
  • the extrusion coating machine technology is becoming more and more mature, its structure is simple, the equipment is compact, and it is easy to debug.
  • the slurry in the coating head is in a closed state and isolated from the outside world, which can ensure a good variety of slurry.
  • the coating accuracy of the extrusion coating machine is much higher than that of the traditional transfer coating machine.
  • the current experimental results show that the minimum thickness limit of transfer coating is 50um, while extrusion coating can reach 20um. Therefore, it has become a development trend to use extrusion coating machines to coat pole pieces of lithium-ion batteries, etc.
  • the weight of the slurry keeps changing in the extrusion head, so that the coating single point or local area still cannot be completely consistent, which undoubtedly causes the coating single point.
  • the coating weight of spots or local areas is low or high, which will affect the quality of the battery.
  • the applicant has designed a coating extrusion head, and a plurality of pressure regulating components are arranged in the housing chamber of the extrusion head, so that the pressure regulating components can adjust the volume of the housing chamber, so that The weight of the slurry can be more balanced and stable during coating.
  • the coating extrusion head disclosed in the embodiment of the present application can be better applied to the manufacturing process of the electrode sheet of the battery.
  • the pole piece is an important part of the cell assembly of the battery.
  • the battery cell assembly is a component in a battery cell where electrochemical reactions occur.
  • the casing may contain one or more cell assemblies.
  • the cell assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and usually a separator is provided between the positive electrode sheet and the negative electrode sheet.
  • the parts of the positive electrode sheet and the negative electrode sheet with the active material constitute the main body of the cell assembly, and the parts of the positive electrode sheet and the negative electrode sheet without the active material respectively constitute tabs.
  • the positive pole tab and the negative pole tab can be located at one end of the main body together or at two ends of the main body respectively.
  • the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the batteries mentioned in this application may include battery modules or battery packs.
  • the embodiment of the first aspect of the present application proposes a coating extrusion head.
  • the coating extrusion head includes an extrusion head body 100 and at least one pressure regulating assembly 300 .
  • An accommodating chamber 200 is provided inside the extrusion head body 100 , and a coating slit 400 communicating with the accommodating chamber 200 is also provided on the extrusion head body 100 .
  • At least one pressure regulating assembly 300 is disposed in the containing chamber 200 and arranged linearly; the pressure regulating assembly 300 is configured to be expandable along a first direction L perpendicular to the coating slit 400 .
  • the coating extrusion head When coating the pole pieces, the coating extrusion head is used to uniformly, continuously or intermittently coat the prepared paste-like viscous slurry on the substrate, and the coating extrusion head has a material inlet 500 , the spraying port and the housing cavity 200, the material inlet 500 and the spraying port should communicate with the housing cavity 200 respectively, wherein the housing chamber 200 is used to accommodate the slurry to be sprayed, and the material inlet 500 is used to input the slurry to be sprayed,
  • the spray port is the outlet of the slurry.
  • the spray port in this embodiment is the coating slit 400.
  • the slurry to be sprayed flows through the spray port and is sprayed onto the pole piece. Therefore, the structural shape of the spray port also determines when the slurry is sprayed. The shape, direction and coverage of the slurry, etc.
  • the extrusion head body 100 is generally a split structure.
  • the extrusion head body 100 can be composed of an upper cover and a lower cover, between which the upper cover and the lower cover can accommodate
  • the accommodating cavity 200 of the slurry due to the viscosity of the slurry, the separate design of the extrusion head body 100 can facilitate the cleaning and maintenance of the accommodating cavity 200.
  • the extrusion head body 100 can also be integrally formed. The present application has no special limitation on the specific form of the extrusion head body 100 .
  • the coating slit 400 is the spraying port of the coating extrusion head, and the slurry to be sprayed flows through the coating slit 400 to be sprayed onto the pole piece.
  • the coating slit 400 of the coating extrusion head is a slender slit, and the slurry flows out from the slender slit to be sprayed onto the pole piece.
  • the width of the slit in the coating slit 400 and the pressure during spraying jointly determine the shape, direction and coverage of the slurry when spraying the slurry.
  • the pressure regulating assembly 300 is used to adjust the volume of the housing chamber 200.
  • the pressure regulating assembly 300 can expand and contract along the first direction L perpendicular to the coating slit 400. Since the coating slit 400 is an elongated slit, when the pressure regulating assembly 300 moves along the first direction perpendicular to the coating slit 400, When L expands and contracts, it can change the volume of the containing chamber 200 corresponding to the coating slit 400 , thereby controlling the flow rate of the slurry flowing through the coating slit 400 .
  • At least one pressure regulating assembly 300 is arranged in the accommodation chamber 200, and the pressure regulating assembly 300 can expand and contract along the direction perpendicular to the coating slit 400, and can adjust the pressure of the accommodation chamber 200. Volume, so as to change the flow rate of the slurry in the accommodation chamber 200.
  • the shrinkage of the pressure regulating assembly 300 can be controlled to increase the volume of the accommodation chamber 200.
  • the flow rate of the slurry in the accommodation chamber 200 will be reduced like this, so that the slurry weight sprayed into the coating single point or local area can be reduced; when the slurry weight of the coating single point or local area exceeds Hours, the pressure regulating assembly 300 can be controlled to stretch out to reduce the volume of the housing chamber 200, so that the flow rate of the slurry in the housing chamber 200 will increase, so that the amount of slurry sprayed to the coating single point or local area can be increased. slurry weight. In this way, it is possible to control the weight of the slurry coated at a single point or a local area by the coating extrusion head during coating, so that the weight of the coated slurry is balanced and stable. It can be seen that this solution can solve the problem of unbalanced and unstable slurry weight at a single point or local area when the existing coating extrusion head is coating.
  • the pressure regulating assembly 300 includes a telescoping device 310 and a pressure sensor 320 .
  • the pressure sensor 320 is arranged on the surface of the telescopic device 310.
  • the pressure sensor 320 is used to detect the pressure on the surface of the telescopic device 310 and transmit the pressure signal to an external control system.
  • the telescopic device 310 is configured to expand and contract according to the control signal of the control system.
  • the telescopic device 310 is the main component of the pressure regulating assembly 300, and it is specifically used to change the volume of the accommodation chamber 200.
  • the telescopic device 310 should include a fixing mechanism and a moving mechanism.
  • the fixing mechanism is fixed in the accommodation chamber 200, and the moving mechanism can move along The first direction L is moved to change the volume of the accommodation cavity 200 .
  • the pressure sensor 320 is a device or device capable of sensing pressure signals and converting the pressure signals into usable and outputtable electrical signals according to certain rules.
  • the pressure sensor 320 can be of various types, such as a gauge pressure sensor, a differential pressure sensor, and an absolute pressure sensor.
  • the pressure sensor 320 is disposed on the surface of the retractable device 310 to detect the pressure in the accommodation chamber 200 .
  • the external control system can be the control system in the coating device.
  • the functions of the control system mainly include: receiving various detection signals, performing corresponding processing on the received detection signals in real time, and Send control signals to each movable part in the coating device to make it perform corresponding actions.
  • each expansion device 310 When there are multiple pressure regulating assemblies 300, by setting pressure sensors 320 on the surface of each expansion device 310, the pressure at the location of a single expansion device 310 can be monitored, and each expansion device 310 can be controlled by the system individual control. In this way, when it is measured that the pressure at a certain position is too high or too low, the corresponding expansion device 310 can be controlled to expand and contract, so as to adjust the pressure at the corresponding position. In this way, it can be ensured that the pressure at each position in the accommodating chamber 200 is kept consistent, thereby improving the uniformity of the discharge from the coating extrusion head.
  • the pressure regulation assembly 300 further includes a wireless signal transceiver 330, and the wireless signal transceiver 330 is configured to transmit the pressure signal of the pressure sensor 320 to an external control in a wireless transmission manner. system, the wireless signal transceiver 330 is also configured to receive a control signal sent by an external control system and transmit the control signal to the telescopic device 310 .
  • the wireless signal transceiver 330 is a device capable of receiving and transmitting wireless signals.
  • the pressure signal of the pressure sensor 320 can be transmitted to the external control system in a wireless transmission mode, and the control signal from the control system can also be transmitted to the telescopic device 310 in a wireless transmission mode, so that , can avoid the complicated wiring and the corrosion of the cable caused by the slurry.
  • the telescoping device 310 is a piezoelectric driving device.
  • Piezoelectric drive devices can convert electrical energy into mechanical energy or mechanical motion by using the inverse piezoelectric effect (transverse effect and longitudinal effect) of piezoelectric materials (polymer bimorphs), which can be specifically piezoelectric actuators.
  • the piezoelectric drive device when the piezoelectric drive device receives the telescopic signal, it can convert the electrical signal into mechanical motion, so that the telescopic state of the moving mechanism in the telescopic device 310 can be changed according to the change of the telescopic signal, and then control the accommodating chamber 200 volume.
  • the extrusion head body 100 further includes an elastic protective film 130 disposed in the accommodation chamber 200 , and the elastic protective film 130 covers at least one pressure regulating component 300 and adjusts the pressure accordingly. Elastic deformation occurs due to expansion and contraction of the assembly 300 .
  • the elastic protective film 130 is a film structure with a certain degree of elasticity.
  • the elastic protective film 130 covers at least one of the pressure regulating components 300 and can elastically deform with the expansion and contraction of the pressure regulating component 300. Therefore, the elastic protective film 130 needs to have a certain degree of flexibility. and toughness, to avoid damage to the elastic protective film 130, the elastic protective film 130 is set in the housing cavity 200, and the housing cavity 200 is used to accommodate the slurry, so the elastic protective film 130 also needs to have anti-corrosion performance, so as to ensure elastic protection The membrane 130 will not be corroded by the slurry.
  • the pressure regulating assembly 300 can be isolated from the slurry in the housing chamber 200, so as to prevent the slurry from flowing into the pressure regulating assembly 300 to the pressure regulating assembly. 300 electrical equipment causing corrosion and damage.
  • the elastic protection film 130 is a carbon fiber film or a tetrafluoroethylene film.
  • the carbon fiber film has super tensile strength, excellent stretchability, and is not easy to break, so it can be used as the first choice for the elastic protective film 130.
  • the tetrafluoroethylene film has the characteristics of high temperature resistance and corrosion resistance, and can also be used as the elastic protective film 130 .
  • the extrusion head body 100 includes an upper extrusion head 110 and a lower extrusion head 120, the upper extrusion head 110 is fastened on the upper part of the lower extrusion head 120, and the upper extrusion The head 110 and the lower extrusion head 120 jointly define a receiving cavity 200 .
  • the upper extrusion head 110 and the lower extrusion head 120 are the main parts of the extrusion head body 100.
  • the upper extrusion head 110 and the lower extrusion head 120 can also be called upper lip and lower lip, or upper cover and lower cover.
  • the accommodating chamber 200 is located in the middle of the upper extrusion head 110 and the lower extrusion head 120. During coating, the pressure in the accommodating chamber 200 is relatively high, therefore, the upper extrusion head 110 and the lower extrusion head 110
  • the head 120 is generally a metal member, which has good strength and rigidity, and can avoid deformation of the extrusion head body 100 caused by excessive pressure in the accommodation cavity 200 of the extrusion head body 100 .
  • a plurality of first mounting holes 113 and second mounting holes 121 are respectively provided on the upper extrusion head 110 and the lower extrusion head 120, and fasteners can pass through the first mounting holes 113 and the second mounting holes 121 to push the upper extrusion
  • the pressing head 110 and the lower extrusion head 120 are fixed together.
  • the upper extrusion head 110 and the lower extrusion head 120 are provided with a wear-resistant material layer near the surface of the coating slit 400.
  • the wear-resistant material layer can be a ceramic layer or a silicon carbide layer.
  • the slurry is ejected from the coating slit 400 formed by the upper extrusion head 110 and the lower extrusion head 120, so the surface of the upper extrusion head 110 and the lower extrusion head 120 near the coating slit 400
  • a wear-resistant material layer is provided, which can reduce the abrasion of the slurry on the upper extrusion head 110 and the lower extrusion head 120 , so as to prolong the service life of the extrusion head body 100 .
  • the extrusion head body 100 is a split design.
  • the interior of the extrusion head body 100 is formed with a housing chamber 200 capable of holding the slurry.
  • the slurry will adhere to the inner wall of the housing chamber 200. Therefore, by placing the extrusion head body 100 is designed as a split type, which is beneficial to cleaning the housing chamber 200, and the split extrusion head body 100 is easier to manufacture than the one-piece coating extrusion head, so it can also reduce the manufacturing cost of the coating extrusion head. cost.
  • the coating extrusion head further includes a sealing gasket 140 , and the sealing gasket 140 is disposed at the contact portion of the upper extrusion head 110 and the lower extrusion head 120 .
  • the sealing gasket 140 is arranged between the upper extrusion head 110 and the lower extrusion head 120.
  • the sealing gasket 140 has a sealing effect, so the sealing gasket 140 needs to have a certain elastic deformation capacity.
  • the sealing gasket 140 can be Corrosion resistant rubber.
  • the contact portion of the upper extrusion head 110 and the lower extrusion head 120 is sealed by providing a sealing gasket 140 at the contact portion of the upper extrusion head 110 and the lower extrusion head 120 .
  • the lower extrusion head 120 is provided with a groove 111 , and the upper extrusion head 110 is fastened on the lower extrusion head 120 to seal the groove 111 to form the receiving cavity 200 .
  • a groove 111 is arranged on the lower extrusion head 120.
  • the shape of the groove 111 is not particularly limited, but the cross-sectional area of the groove 111 should be the same, so as to ensure that the coating slit 400 corresponds to the cavity 200 The volumes are all equal.
  • the telescopic device 310 is disposed in the groove 111 , so when designing the size of the groove 111 , it should also be considered that the groove 111 can accommodate the telescopic device 310 .
  • the accommodating chamber 200 can be formed by buckling the upper extrusion head 110 on the lower extrusion head 120 and closing the groove 111. Since only the lower extrusion head 120 is provided with the groove 111, the upper extrusion The manufacture of the indenter 110 can be relatively simple, thereby achieving the purpose of reducing costs.
  • the edge of the upper extrusion head 110 is provided with a handle portion 112 for grasping.
  • the handle 112 When disassembling the upper extrusion head 110 and the lower extrusion head 120, the operator can hold the handle 112 to facilitate the disassembly of the upper extrusion head 110 and the lower extrusion head 120, therefore, the handle 112 can be any hand
  • the shape of the grip is not specifically limited in this application again.
  • the upper extrusion head 110 and the lower extrusion head 120 can be separated more conveniently by providing the holding portion 112 on the edge of the upper extrusion head 110 .
  • the coating extrusion head includes an extrusion head body 100 and at least one pressure regulating assembly 300 .
  • the extrusion head body 100 includes an upper extrusion head 110, a lower extrusion head 120, a sealing gasket 140, a carbon fiber film and a holding portion 112, the lower extrusion head 120 is provided with a groove 111, and the upper extrusion head 110 is buckled.
  • a housing cavity 200 is formed on the lower extrusion head 120, a sealing gasket 140 is arranged between the upper extrusion head 110 and the lower extrusion head 120, and the upper extrusion head 110 and the lower extrusion head 120 are separated to form a coating slit 400, the carbon fiber membrane covers the pressure regulating assembly 300 and elastically deforms as the pressure regulating assembly 300 expands and contracts, and the edge of the upper extrusion head 110 is provided with a handle 112 for grasping.
  • At least one pressure regulating assembly 300 is disposed in the containing cavity 200 and arranged linearly, and the pressure regulating assembly 300 is configured to expand and contract along a first direction L perpendicular to the coating slit 400 .
  • the pressure regulating assembly 300 includes a telescoping device 310 , a pressure sensor 320 and a wireless signal transceiver 330 .
  • the telescoping device 310 can telescopically expand and contract along the first direction L when receiving the telescoping control signal.
  • the pressure sensor 320 is arranged on the surface of the telescopic device 310 , and the pressure sensor 320 is used to detect the pressure on the surface of the telescopic device 310 .
  • the wireless signal transceiver 330 is configured to wirelessly transmit the pressure signal of the pressure sensor 320 to an external control system, and the wireless signal transceiver 330 is also configured to receive a control signal of the control system and transmit the control signal to the telescopic device 310 .
  • At least one pressure regulating assembly 300 is arranged in the accommodation chamber 200, and the pressure regulating assembly 300 can expand and contract along the direction perpendicular to the coating slit 400, and can adjust the pressure of the accommodation chamber 200. Volume, so as to change the flow rate of the slurry in the accommodation chamber 200.
  • the shrinkage of the pressure regulating assembly 300 can be controlled to increase the volume of the accommodation chamber 200.
  • the flow rate of the slurry in the accommodation chamber 200 will be reduced like this, so that the slurry weight sprayed into the coating single point or local area can be reduced; when the slurry weight of the coating single point or local area exceeds Hours, the pressure regulating assembly 300 can be controlled to stretch out to reduce the volume of the housing chamber 200, so that the flow rate of the slurry in the housing chamber 200 will increase, so that the amount of slurry sprayed to the coating single point or local area can be increased. slurry weight. In this way, it is possible to control the weight of the slurry coated at a single point or a local area by the coating extrusion head during coating, so that the weight of the coated slurry is balanced and stable. It can be seen that this solution can solve the problem of unbalanced and unstable slurry weight at a single point or local area when the existing coating extrusion head is coating.
  • each expansion device 310 when there are multiple pressure regulating assemblies 300, by setting the pressure sensor 320 on the surface of each expansion device 310, the pressure at the location of a single expansion device 310 can be monitored, and each expansion device 310 can be monitored. The control system is controlled separately. In this way, when it is measured that the pressure at a certain position is too high or too low, the corresponding expansion device 310 can be controlled to expand and contract, so as to adjust the pressure at the corresponding position. In this way, it can be ensured that the pressure at each position in the accommodating chamber 200 is kept consistent, thereby improving the uniformity of the discharge from the coating extrusion head.
  • the pressure signal of the pressure sensor 320 can be transmitted to the external control system in a wireless transmission mode, and the control signal from the control system can also be transmitted to the telescopic device 310 in a wireless transmission mode. , In this way, the complexity of the wiring and the corrosion of the cable caused by the slurry can be avoided.
  • the embodiment of the second aspect of the present application provides a coating device, including the coating extrusion head in any embodiment of the first aspect.
  • the coating device is used to coat the active material material on the current collector to form a pole piece.
  • the active material material can also be referred to as slurry for short.
  • the slurry is sprayed onto the current collector through a coating extrusion head to form a pole piece.
  • At least one adjustment device is arranged in the accommodation chamber 200 of the coating extrusion head.
  • the pressure assembly 300, the pressure adjustment assembly 300 expands and contracts along the direction perpendicular to the coating slit 400, can adjust the volume of the accommodation chamber 200, thereby changing the flow rate of the slurry in the accommodation chamber 200, when performing the coating process, when coating
  • the shrinkage of the pressure regulating assembly 300 can be controlled to increase the volume of the accommodation chamber 200, so that the flow rate of the slurry in the accommodation chamber 200 will be reduced, so that the amount of spraying can be reduced.
  • the slurry weight in this coating single point or local area can control pressure regulator assembly 300 to stretch out to reduce the volume of housing chamber 200, housing chamber 200 like this
  • the flow rate of the inner slurry will be increased, so that the weight of the slurry sprayed to the coating single point or local area can be increased.
  • this solution can solve the problem of unbalanced and unstable slurry weight at a single point or local area when the existing coating extrusion head is coating.

Abstract

一种涂布挤压头，包括挤压头本体(100)和至少一个调压组件(300)，挤压头本体(100)设有相互连通的涂布狭缝(400)和容纳腔(200)，至少一个调压组件(300)设置于容纳腔(200)中，调压组件(300)被配置为可沿垂直于涂布狭缝(400)的第一方向伸缩；还公开了一种包含上述涂布挤压头的涂布装置。调压组件(300)沿垂直于涂布狭缝(400)的方向伸缩，可以调节容纳腔(200)的体积，从而改变容纳腔(200)内浆料的流量，达到控制涂布挤压头在涂布时涂布单点或局部区域的浆料重量的效果，使涂布的浆料重量均衡、稳定。

Description

涂布挤压头及涂布装置
本申请要求于2021年10月29日在中国专利局提交的、申请号为202122621850.1、实用新型名称为“涂布挤压头及涂布装置”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
本申请涉及电池基材涂布技术领域，具体涉及一种涂布挤压头及涂布装置。
 背景技术
涂布是电池生产过程中必不可少的工序，主要应用在电池的极片制作中。极片制作中的涂布，是指将制作好的糊状粘稠浆料均匀地、连续或间断地涂布在极片上的过程。需要保证极片各个涂布位置的厚度一致，并将涂布厚度控制在工艺要求的公差范围内。涂布的质量直接影响电池安全性、容量和一致性等各项性能。
目前，相关技术在极片涂布时，涂布区的浆料不均匀，影响电池的质量。
 技术问题
本申请实施例的目的之一在于：提供一种布挤压头及涂布装置，可以解决现有涂布挤压头在涂布时，涂布区的浆料不均匀的问题。
 技术解决方案
本申请实施例采用的技术方案是：
第一方面，提供了一种涂布挤压头，涂布挤压头包括挤压头本体和至少一个调压组件，挤压头本体的内部设有容纳腔，挤压头本体上还设置有与容纳腔连通的涂布狭缝，至少一个调压组件设置于容纳腔中，调压组件被配置为可沿垂直于涂布狭缝的第一方向伸缩。
在一个实施例中，调压组件包括伸缩装置和压力传感器，压力传感器设置在伸缩装置的表面，压力传感器用于检测伸缩装置表面的压力并将压力信号传输给外部的控制系统，伸缩装置配置为根据所述控制系统的控制信号进行伸缩。
在一个实施例中，调压组件还包括无线信号收发器，无线信号收发器配置为将压力传感器的压力信号以无线传输的方式传输给外部的控制系统，无线信号收发器还配置为接收外部的控制系统发出的控制信号并将控制信号传输给伸缩装置。
在一个实施例中，伸缩装置为压电驱动装置。
在一个实施例中，调压组件的数量为多个，多个调压组件呈线性排布。
在一个实施例中，挤压头本体还包括设置在容纳腔内的弹性保护膜，弹性保护膜覆盖在至少一个调压组件上并随调压组件的伸缩而发生弹性变形。
在一个实施例中，弹性保护膜为碳纤维膜或四氟乙烯膜。
在一个实施例中，挤压头本体包括上挤压头和下挤压头，上挤压头扣设在下挤压头的上部，上挤压头和下挤压头共同限定出容纳腔。
在一个实施例中，涂布挤压头还包括密封垫片，密封垫片设置在上挤压头和下挤压头的接触部位。
在一个实施例中，下挤压头设有凹槽，上挤压头扣设在下挤压头上以将凹槽封闭形成容纳腔。
在一个实施例中，挤压头本体还包括紧固件，上挤压头设置有第一安装孔，下挤压头设置有第二安装孔，紧固件穿过第一安装孔和第二安装孔以将上挤压头和下挤压头固定连接。
在一个实施例中，涂布狭缝设置于上挤压头和下挤压头之间，上挤压头靠近涂布狭缝的表面和下挤压头靠近涂布狭缝的表面均设有耐磨材料层。
在一个实施例中，耐磨材料层为陶瓷层或者碳化硅层。
在一个实施例中，上挤压头的边缘设有用于抓握的把持部。
第二方面，提供一种涂布装置，包括上述任一个实施例的涂布挤压头。
 有益效果
本申请实施例提供的涂布挤压头的有益效果在于：在容纳腔内设置有至少一个调压组件，该调压组件能够沿垂直于涂布狭缝方向伸缩，以此来调节容纳腔的体积，从而改变容纳腔内浆料的流量，在进行涂布工艺时，当涂布单点或局部区域的浆料重量过大时，可以控制调压组件收缩以增大容纳腔的体积，这样容纳腔内浆料的流量便会减小，以此便能够减少喷涂到该涂布单点或局部区域内的浆料重量；当涂布单点或局部区域的浆料重量过小时，可以控制调压组件伸出以减小容纳腔的体积，这样容纳腔内浆料的流量便会增大，以此便能够增加喷涂到该涂布单点或局部区域内的浆料重量。这样，便能够控制涂布挤压头在涂布时涂布单点或局部区域的浆料重量，使涂布的浆料重量均衡、稳定。可见，通过本方案可以解决现有涂布挤压头在涂布时，涂布单点或局部区域的浆料重量不均衡、不稳定的问题。
本申请实施例提供的涂布装置的有益效果在于：由于其具有第一方面实施例中的涂布挤压头，因此，在涂布挤压头的容纳腔内设置有至少一个调压组件，该调压组件沿垂直于涂布狭缝方向的伸缩，可以调节容纳腔的体积，从而改变容纳腔内浆料的流量，达到控制涂布挤压头在涂布时涂布单点或局部区域的浆料重量，使涂布的浆料重量均衡、稳定。故而，本申请实施例中的涂布装置也能够解决现有涂布挤压头在涂布时，涂布单点或局部区域的浆料重量不均衡、不稳定的问题。
 附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例或示范性技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本申请实施例中涂布挤压头的结构示意图。
图2为本申请实施例中涂布挤压头的下挤压头和调压组件的结构示意图。
图3为本申请实施例中涂布挤压头的下挤压头的结构示意图。
图4为本申请实施例中涂布挤压头的上挤压头的结构示意图。
图5为本申请实施例中涂布挤压头的主视图。
图6为本申请实施例中涂布挤压头的侧视图。
图7为本申请实施例中涂布挤压头的调压组件的结构示意图。
附图标记说明：
100、挤压头本体；110、上挤压头；111、凹槽；112、把持部；113、第一安装孔；120、下挤压头；121、第二安装孔；130、弹性保护膜；140、垫片；
200、容纳腔；
300、调压组件；310、伸缩装置；320、压力传感器；330、无线信号收发器；
400、涂布狭缝；
500、入料口；
L、第一方向。
 本发明的实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
需说明的是，当部件被称为“固定于”或“设置于”另一个部件，它可以直接在另一个部件上或者间接在该另一个部件上。当一个部件被称为是“连接于”另一个部件，它可以是直接或者间接连接至该另一个部件上。术语“上”、“下”、“左”、“右”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制，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的具体含义。术语“第一”、“第二”仅用于便于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明技术特征的数量。“多个”的含义是两个或两个以上，除非另有明确具体的限定。
涂布是锂离子电池生产过程中必不可少的工序，也是直接影响电池安全性、容量和一致性等各项性能的关键工序。涂布就是将制作好的电池浆料均匀地、连续或间断地涂布在基材(铝箔或铜箔)上，保证各个涂布位置的厚度一致性，并将涂布厚度控制在工艺要求的公差范围内。
目前国内常用的涂布方式有两种：转移式涂布和挤压式涂布。转移式涂布是一种成熟的技术，但其结构复杂，设备调试繁琐。而且，转移式涂布的浆料处于裸露状态(即浆料暴露在空气中)，浆料性能难以保证。
而挤压式涂布机技术日益成熟，它的结构简单，设备紧凑，调试方便。此外，涂布头内的浆料处于封闭状态，与外界隔绝，能够确保浆料的优良品种。而且挤压涂布式涂布机的涂布精度要比传统的转移涂布机高很多。目前实验结果表明，转移式涂布的最小厚度极限是50um，而挤压式涂布可以达到20um。因此，采用挤压式涂布机对锂离子电池的极片等进行涂布已经成为发展趋势。
目前，相关技术在对极片进行涂布工艺时，在挤压头中，浆料的重量一直发生变化，从而导致涂布单点或者局部区域仍然无法做到完全一致，这样无疑造成涂布单点或局部区域的涂布重量存在偏低或偏高的情况，进而影响电池质量。申请人进过反复的研究和论证，设计出一种涂布挤压头，在挤压头的容纳腔内设置多个调压组件，由此，调压组件便能够调节容纳腔的体积，使涂布时浆料的重量能够更加均衡、稳定。
本申请实施例公开的涂布挤压头，可以较好地应用于电池的极片的制作过程。其中，极片是电池的电芯组件的重要组成部分。具体地，电芯组件是电池单体中发生电化学反应的部件。壳体内可以包含一个或更多个电芯组件。电芯组件主要由正极片和负极片卷绕或层叠放置形成，并且通常在正极片与负极片之间设有隔膜。正极片和负极片具有活性物质的部分构成电芯组件的主体部，正极片和负极片不具有活性物质的部分各自构成极耳。正极极耳和负极极耳可以共同位于主体部的一端或是分别位于主体部的两端。在电池的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳连接电极端子以形成电流回路。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模组或电池包等。
为了说明本申请所提供的技术方案，以下结合具体附图及实施例进行详细说明。
如图1至图7所示，本申请第一方面的实施例提出了一种涂布挤压头。涂布挤压头包括挤压头本体100和至少一个调压组件300。挤压头本体100的内部设置有容纳腔200，挤压头本体100上还设置有与容纳腔200连通的涂布狭缝400。至少一个调压组件300设置于容纳腔200且呈线性排布；调压组件300被配置为可沿垂直于涂布狭缝400的第一方向L伸缩。
在对极片进行涂布时，涂布挤压头用于将制作好的糊状粘稠浆料，均匀、连续或间断地涂布在基材上，涂布挤压头具有入料口500、喷涂口和容纳腔200，入料口500和喷涂口应分别与容纳腔200连通，其中，容纳腔200用于容纳待喷涂的浆料，入料口500用于输入需要喷涂的浆料，喷涂口为浆料的出口，本实施例中的喷涂口为涂布狭缝400，待喷涂的浆料流经喷涂口被喷涂到极片上，因此喷涂口的结构形状也决定了喷涂浆料时浆料的形状、方向以及覆盖范围等。
挤压头本体100作为涂布挤压头的主体部分，其一般为分体式结构，例如，挤压头本体100可以为上盖和下盖组成，在上盖和下盖之间即为能够容纳浆料的容纳腔200，由于浆料具有粘性，因此将挤压头本体100分体设计可以方便对容纳腔200进行清洗和维护，在一些应用场合，挤压头本体100也可以为一体成型，本申请对挤压头本体100的具体形式没有特殊限定。
涂布狭缝400即为涂布挤压头的喷涂口，待喷涂的浆料流经涂布狭缝400被喷涂到极片上。涂布挤压头的涂布狭缝400为细长型的缝隙，浆料从细长的缝隙流出被喷涂到极片上。涂布狭缝400中缝隙的宽度和喷涂时的压力共同决定了喷涂浆料时浆料的形状、方向以及覆盖范围等。
调压组件300用于调节容纳腔200的体积，在对极片进行涂布时，当容纳腔200的体积发生变化时，容纳腔200内浆料的体积也随之发生变化，以此来改变容纳腔200内浆料的喷涂量。调压组件300可沿垂直于涂布狭缝400的第一方向L伸缩，由于涂布狭缝400为细长的缝隙，因此当调压组件300沿垂直于涂布狭缝400的第一方向L伸缩时，其可以改变涂布狭缝400所对应容纳腔200的体积，进而达到控制流经涂布狭缝400时浆料的流量。
根据本申请实施例中的涂布挤压头，在容纳腔200内设置有至少一个调压组件300，该调压组件300沿垂直于涂布狭缝400方向的伸缩，可以调节容纳腔200的体积，从而改变容纳腔200内浆料的流量，在进行涂布工艺时，当涂布单点或局部区域的浆料重量过大时，可以控制调压组件300收缩以增大容纳腔200的体积，这样容纳腔200内浆料的流量便会减小，以此便能够减少喷涂到该涂布单点或局部区域内的浆料重量；当涂布单点或局部区域的浆料重量过小时，可以控制调压组件300伸出以减小容纳腔200的体积，这样容纳腔200内浆料的流量便会增大，以此便能够增加喷涂到该涂布单点或局部区域内的浆料重量。这样，便能够达到控制涂布挤压头在涂布时涂布单点或局部区域的浆料重量，使涂布的浆料重量均衡、稳定。可见，通过本方案可以解决现有涂布挤压头在涂布时，涂布单点或局部区域的浆料重量不均衡、不稳定的问题。
在本申请的一些实施例中，请参阅图7，调压组件300包括伸缩装置310和压力传感器320。压力传感器320设置在伸缩装置310的表面，压力传感器320用于检测伸缩装置310表面的压力并将压力信号传输给外部的控制系统，伸缩装置310配置为根据控制系统的控制信号进行伸缩。
伸缩装置310为调压组件300的主体构件，其具体用于改变容纳腔200的体积，伸缩装置310应包括固定机构和移动机构，固定机构固定于容纳腔200内，移动机构能够相对固定机构沿第一方向L发生移动，以改变容纳腔200的体积。
压力传感器320是能感受压力信号，并能按照一定的规律将压力信号转换成可用的且可输出的电信号的器件或装置。压力传感器320的种类可以有多种，例如表压传感器、差压传感器和绝压传感器等。压力传感器320设置在伸缩装置310的表面，以此来检测容纳腔200内的压力。
外部的控制系统可以为涂布装置中的控制系统，在涂布装置实施涂布的过程中，控制系统的功能主要包括：接收各种检测信号，对接收到检测信号实时进行相应的处理，以及向涂布装置中的各可动部件发送使其实施相应动作的控制信号。
当调压组件300为多个时，通过在各伸缩装置310的表面分别设置压力传感器320，由此，可以实现对单个伸缩装置310所在位置的压力进行监测，并且各个伸缩装置310可以被控制系统单独控制。这样，当测量到某位置处的压力过高或过低时，可以控制相应的伸缩装置310进行伸缩，以便于对相应位置的压力进行调整。通过这种方式，可以保证容纳腔200中各位置处压力的保持一致，进而提高涂布挤压头出料的均匀性。
在本申请的一些实施例中，请参阅图7，调压组件300还包括无线信号收发器330，无线信号收发器330配置为将压力传感器320的压力信号以无线传输的方式传输给外部的控制系统，无线信号收发器330还配置为接收外部的控制系统发出的控制信号并将控制信号传输给伸缩装置310。
无线信号收发器330为具有接收以及发射无线信号功能的器件。
通过设置无线信号收发器330，使压力传感器320的压力信号能够以无线传输的方式传输给外部的控制系统，也使得来自于控制系统的控制信号能够以无线传输的方式传输给伸缩装置310，这样，可以避免布线的繁琐以及浆料对线缆造成的腐蚀。
在本申请的一些实施例中，伸缩装置310为压电驱动装置。
压电驱动装置能够利用压电材料（聚合物双晶片）逆压电效应（横向效应和纵向效应），将电能转变为机械能或机械运动，其具体可以为压电致动器。在本实施例中，压电驱动装置在接收到伸缩信号时，能够将电信号转变为机械运动，以此便可根据伸缩信号的变化来改变伸缩装置310中移动机构的伸缩状态，进而控制容纳腔200的体积。
在本申请的一些实施例中，请参阅图6，挤压头本体100还包括设置在容纳腔200内的弹性保护膜130，弹性保护膜130覆盖在至少一个调压组件300上并随调压组件300的伸缩而发生弹性变形。
弹性保护膜130为具备一定弹性的膜结构，弹性保护膜130覆盖在至少一个调压组件300上，并能够随调压组件300的伸缩而发生弹性变形，因此弹性保护膜130需具备一定的柔性和韧性，以避免弹性保护膜130发生损伤，弹性保护膜130设置在容纳腔200内，而容纳腔200用于容纳浆料，故而弹性保护膜130还需具备防腐性能，以此来确保弹性保护膜130不会被浆料腐蚀。
在本实施例中，通过在调压组件300上覆盖弹性保护膜130能够将调压组件300与容纳腔200内的浆料隔绝，以此避免浆料流入调压组件300的内部对调压组件300的电设备造成腐蚀和损伤。
在本申请的一些实施例中，弹性保护膜130为碳纤维膜或四氟乙烯膜。
碳纤维膜具有超强的抗拉力性，伸缩性能极好，不易断裂，因此可以作为弹性保护膜130的首选。四氟乙烯膜具备耐高温、耐腐蚀的特点，亦可以作为弹性保护膜130。
在本申请的一些实施例中，请参阅图1，挤压头本体100包括上挤压头110和下挤压头120，上挤压头110扣设在下挤压头120的上部，上挤压头110和下挤压头120共同限定出容纳腔200。
上挤压头110和下挤压头120为挤压头本体100的主体部分，在相关技术中，上挤压头110和下挤压头120也可以称为上唇和下唇，或者，上盖和下盖。在本实施例中，容纳腔200位于上挤压头110和下挤压头120的中间部位，在涂布时，容纳腔200内的压力较大，因此，上挤压头110和下挤压头120一般为金属构件，其具备较好的强度和刚度，能够避免挤压头本体100的容纳腔200内存在过大的压力而对挤压头本体100造成形变。在上挤压头110和下挤压头120上分别设置有多个第一安装孔113和第二安装孔121，紧固件可以穿过第一安装孔113和第二安装孔121将上挤压头110和下挤压头120固定在一起。
更进一步地，上挤压头110和下挤压头120靠近涂布狭缝400的表面设有耐磨材料层，耐磨材料层可以是陶瓷层或碳化硅层，可以理解，在对极片进行涂布时，浆料从上挤压头110和下挤压头120形成的涂布狭缝400喷出，因此在上挤压头110和下挤压头120靠近涂布狭缝400的表面设有耐磨材料层，可以减少浆料对上挤压头110和下挤压头120的磨损，以延长挤压头本体100的使用时间。
在本实施例中，挤压头本体100为分体式设计。挤压头本体100的内部形成有能够容纳浆料的容纳腔200，当涂布挤压头频繁的使用后，会有浆料粘附在容纳腔200的内壁，因此，通过把挤压头本体100设计为分体式有利于对容纳腔200进行清洁，而且分体式的挤压头本体100相比于一体式的涂布挤压头更为容易制造，故而也能降低涂布挤压头的制造成本。
在本申请的一些实施例中，请参阅图5，涂布挤压头还包括密封垫片140，密封垫片140设置在上挤压头110和下挤压头120的接触部位。
密封垫片140设置在上挤压头110和下挤压头120之间，密封垫片140具备密封作用，因此密封垫片140需为具备一定弹性形变能力，具体地，密封垫片140可以为耐腐蚀橡胶。
在本实施例中，通过在上挤压头110和下挤压头120的接触部位设置密封垫片140，以对上挤压头110和下挤压头120的接触部位进行密封。
在本申请的一些实施例中，请参阅图3，下挤压头120设有凹槽111，上挤压头110扣设在下挤压头120上以将凹槽111封闭形成容纳腔200。
在下挤压头120上设置有凹槽111，凹槽111的形状没有特殊限定，但是凹槽111的横截面的面积应相同，以此来保证涂布狭缝400所对应的容纳腔200内的体积均相等。在凹槽111内设置有伸缩装置310，因此在设计凹槽111的尺寸时也应该考虑到该凹槽111能够容纳伸缩装置310。
在本实施例中，通过将上挤压头110扣设在下挤压头120上将凹槽111封闭便能够形成容纳腔200，由于只有下挤压头120内设置有凹槽111，因此上挤压头110的制造能够相对简单，由此来达到降低成本的目的。
在本申请的一些实施例中，请参阅图4，上挤压头110的边缘设有用于抓握的把持部112。
在对上挤压头110和下挤压头120进行拆装时，操作人员可以手持把持部112以方便拆装上挤压头110和下挤压头120，因此，把持部112可以为任何手握的形状，本申请再次不做具体限定。
在本实施例中，通过在上挤压头110的边缘设置把持部112，能够较为方便的将上挤压头110和下挤压头120分开。
在本申请的一些实施例中，涂布挤压头包括挤压头本体100和至少一个调压组件300。其中，挤压头本体100包括上挤压头110、下挤压头120、密封垫片140、碳纤维膜和把持部112，下挤压头120设有凹槽111，上挤压头110扣设在下挤压头120上形成容纳腔200，密封垫片140设置在上挤压头110和下挤压头120之间，将上挤压头110和下挤压头120隔开形成涂布狭缝400，碳纤维膜覆盖在调压组件300上并随调压组件300的伸缩而发生弹性变形，上挤压头110的边缘设有用于抓握的把持部112。至少一个调压组件300设置于容纳腔200且呈线性排布，调压组件300被配置为可沿垂直于涂布狭缝400的第一方向L伸缩。调压组件300包括伸缩装置310、压力传感器320和无线信号收发器330。伸缩装置310在收到伸缩控制信号时，可沿第一方向L伸缩。压力传感器320设置在伸缩装置310的表面，压力传感器320用于检测伸缩装置310表面的压力。无线信号收发器330配置为将压力传感器320的压力信号以无线传输的方式传输给外部的控制系统，无线信号收发器330还配置为接收控制系统的控制信号并将控制信号传输给伸缩装置310。
根据本申请实施例中的涂布挤压头，在容纳腔200内设置有至少一个调压组件300，该调压组件300沿垂直于涂布狭缝400方向的伸缩，可以调节容纳腔200的体积，从而改变容纳腔200内浆料的流量，在进行涂布工艺时，当涂布单点或局部区域的浆料重量过大时，可以控制调压组件300收缩以增大容纳腔200的体积，这样容纳腔200内浆料的流量便会减小，以此便能够减少喷涂到该涂布单点或局部区域内的浆料重量；当涂布单点或局部区域的浆料重量过小时，可以控制调压组件300伸出以减小容纳腔200的体积，这样容纳腔200内浆料的流量便会增大，以此便能够增加喷涂到该涂布单点或局部区域内的浆料重量。这样，便能够达到控制涂布挤压头在涂布时涂布单点或局部区域的浆料重量，使涂布的浆料重量均衡、稳定。可见，通过本方案可以解决现有涂布挤压头在涂布时，涂布单点或局部区域的浆料重量不均衡、不稳定的问题。
另外，当调压组件300为多个时，通过设置在各伸缩装置310的表面设置压力传感器320，由此，可以实现对单个伸缩装置310所在位置的压力进行监测，并且各伸缩装置310可以被控制系统单独控制。这样，当测量到某位置处的压力过高或过低时，可以控制相应的伸缩装置310进行伸缩，以便于对相应位置的压力进行调整。通过这种方式，可以保证容纳腔200中各位置处压力的保持一致，进而提高涂布挤压头出料的均匀性。
再者，通过设置无线信号收发器330，使压力传感器320的压力信号能够以无线传输的方式传输给外部的控制系统，也使得来自于控制系统的控制信号能够以无线传输的方式达到伸缩装置310，这样，可以避免布线的繁琐以及浆料对线缆造成的腐蚀。
本申请第二方面的实施例提出了一种涂布装置，包括第一方面任一实施例中的涂布挤压头。
涂布装置用于将活性物质材料涂布到集流体上以形成极片，活性物质材料也可简称为浆料，浆料经由涂布挤压头被喷涂到集流体上并形成极片。
根据本申请实施例中的涂布装置，由于其具有第一方面实施例中任一个实施例中的涂布挤压头，因此，在涂布挤压头的容纳腔200内设置有至少一个调压组件300，该调压组件300沿垂直于涂布狭缝400方向的伸缩，可以调节容纳腔200的体积，从而改变容纳腔200内浆料的流量，在进行涂布工艺时，当涂布单点或局部区域的浆料重量过大时，可以控制调压组件300收缩以增大容纳腔200的体积，这样容纳腔200内浆料的流量便会减小，以此便能够减少喷涂到该涂布单点或局部区域内的浆料重量；当涂布单点或局部区域的浆料重量过小时，可以控制调压组件300伸出以减小容纳腔200的体积，这样容纳腔200内浆料的流量便会增大，以此便能够增加喷涂到该涂布单点或局部区域内的浆料重量。这样，便能够达到控制涂布挤压头在涂布时涂布单点或局部区域的浆料重量，使涂布的浆料重量均衡、稳定。可见，通过本方案可以解决现有涂布挤压头在涂布时，涂布单点或局部区域的浆料重量不均衡、不稳定的问题。
以上仅为本申请的可选实施例而已，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权利要求范围之内。

Claims (15)

  1. 一种涂布挤压头，其特征在于，包括：
    挤压头本体，所述挤压头本体的内部设有容纳腔，所述挤压头本体上还设置有与所述容纳腔连通的涂布狭缝；
    至少一个调压组件，所述至少一个调压组件设置于所述容纳腔中，所述调压组件被配置为可沿垂直于所述涂布狭缝的第一方向伸缩。
  2. 根据权利要求1所述的涂布挤压头，其特征在于，所述调压组件包括伸缩装置和压力传感器，所述压力传感器设置在所述伸缩装置的表面，所述压力传感器用于检测所述伸缩装置表面的压力并将压力信号传输给外部的控制系统，所述伸缩装置配置为根据所述控制系统的控制信号进行伸缩。
  3. 根据权利要求2所述的涂布挤压头，其特征在于，所述调压组件还包括无线信号收发器，所述无线信号收发器配置为将所述压力传感器的压力信号以无线传输的方式传输给所述控制系统，所述无线信号收发器还配置为接收所述控制系统的控制信号并将所述控制信号传输给所述伸缩装置。
  4. 根据权利要求2所述的涂布挤压头，其特征在于，所述伸缩装置为压电驱动装置。
  5. 根据权利要求1-4任一项所述的涂布挤压头，其特征在于，所述调压组件的数量为多个，多个所述调压组件呈线性排布。
  6. 根据权利要求1所述的涂布挤压头，其特征在于，所述挤压头本体还包括设置在所述容纳腔内的弹性保护膜；
    所述弹性保护膜覆盖在至少一个所述调压组件上并随所述调压组件的伸缩而发生弹性变形。
  7. 根据权利要求6所述的涂布挤压头，其特征在于，所述弹性保护膜为碳纤维膜或四氟乙烯膜。
  8. 根据权利要求1所述的涂布挤压头，其特征在于，所述挤压头本体包括上挤压头和下挤压头，所述上挤压头扣设在所述下挤压头的上部，所述上挤压头和所述下挤压头共同限定出所述容纳腔。
  9. 根据权利要求8所述的涂布挤压头，其特征在于，涂布挤压头还包括密封垫片，所述密封垫片设置在述所述上挤压头和所述下挤压头的接触部位。
  10. 根据权利要求8所述的涂布挤压头，其特征在于，所述下挤压头设有凹槽，所述上挤压头扣设在所述下挤压头上以将所述凹槽封闭形成所述容纳腔。
  11. 根据权利要求8所述的涂布挤压头，其特征在于，所述挤压头本体还包括紧固件，所述上挤压头设置有第一安装孔，所述下挤压头设置有第二安装孔，所述紧固件穿过所述第一安装孔和所述第二安装孔以将所述上挤压头和所述下挤压头固定连接。
  12. 根据权利要求8所述的涂布挤压头，其特征在于，所述涂布狭缝设置于所述上挤压头和所述下挤压头之间，所述上挤压头靠近涂布狭缝的表面和所述下挤压头靠近涂布狭缝的表面均设有耐磨材料层。
  13. 根据权利要求12所述的涂布挤压头，其特征在于，所述耐磨材料层为陶瓷层或者碳化硅层。
  14. 根据权利要求8所述的涂布挤压头，其特征在于，所述上挤压头的边缘设有用于抓握的把持部。
  15. 一种涂布装置，其特征在于，所述涂布装置包括如权利要求1-14中任一项所述的涂布挤压头。
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