WO2022151541A1 - 电池极片成型设备及成型方法 - Google Patents

电池极片成型设备及成型方法 Download PDF

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Publication number
WO2022151541A1
WO2022151541A1 PCT/CN2021/074986 CN2021074986W WO2022151541A1 WO 2022151541 A1 WO2022151541 A1 WO 2022151541A1 CN 2021074986 W CN2021074986 W CN 2021074986W WO 2022151541 A1 WO2022151541 A1 WO 2022151541A1
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WO
WIPO (PCT)
Prior art keywords
pressing roller
roller
pole piece
structures
battery pole
Prior art date
Application number
PCT/CN2021/074986
Other languages
English (en)
French (fr)
Inventor
朱亮
赵瑞瑞
李焌桦
祝媛
刘建华
刘金成
Original Assignee
惠州亿纬锂能股份有限公司
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 惠州亿纬锂能股份有限公司 filed Critical 惠州亿纬锂能股份有限公司
Priority to US18/272,321 priority Critical patent/US20240066549A1/en
Priority to EP21918740.8A priority patent/EP4241973A1/en
Publication of WO2022151541A1 publication Critical patent/WO2022151541A1/zh

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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
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/008—Accessories or implements for use in connection with applying particulate materials to surfaces; not provided elsewhere in B05C19/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
    • B30B3/04—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs co-operating with one another, e.g. with co-operating cones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/28—Presses specially adapted for particular purposes for forming shaped articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
    • 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
    • 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 pole piece production equipment, for example, to a battery pole piece forming equipment and forming method.
  • Lithium-ion batteries have high energy density and have been used in mobile phones, notebook computers, and other fields. However, with the expansion and development of applications, further performance improvements such as lower resistance and higher capacity are required.
  • Lithium ion battery electrodes can be obtained in the form of battery electrode sheets.
  • powder compression molding using a powder calendering apparatus has been performed.
  • the powder is compressed and molded by a pressing roller on both sides of the substrate to obtain battery pole pieces.
  • the substrate is easily shaken during the transmission process, resulting in powder on both sides of the substrate.
  • the thickness is different, which makes the expansion of different regions of the battery pole piece different in the later work process, which makes the powder easy to fall off the substrate, which affects the normal operation of the subsequent lithium-ion battery.
  • the present application provides a battery pole piece forming equipment and forming method, which can solve the problem in the related art that the thickness of the powder on both sides of the base material of the battery pole piece is different, which affects the normal operation of the subsequent lithium ion battery.
  • a battery pole piece forming equipment includes a conveying mechanism for conveying a substrate, a feeding mechanism and a rolling mechanism, wherein the rolling mechanism comprises a first pressing roller, a second pressing roller and a third pressing roller arranged side by side in sequence and a fourth pressure roller, the distance between the first pressure roller and the second pressure roller is the same as the distance between the third pressure roller and the fourth pressure roller, and the substrate is vertically The direction penetrates between the second pressing roller and the third pressing roller, and the first pressing roller and the second pressing roller can roll the active material particles conveyed by the conveying mechanism to form the first pressing roller.
  • the rolling mechanism comprises a first pressing roller, a second pressing roller and a third pressing roller arranged side by side in sequence and a fourth pressure roller, the distance between the first pressure roller and the second pressure roller is the same as the distance between the third pressure roller and the fourth pressure roller, and the substrate is vertically The direction penetrates between the second pressing roller and the third pressing roller, and the first pressing roller and the second pressing roller can roll the active material particles conveyed
  • the third pressing roller and the fourth pressing roller can roll the active substance particles conveyed by the feeding mechanism to form a second film sheet
  • the second pressing roller and the third pressing roller can The first film sheet and the second film sheet are respectively rolled on both sides of the substrate.
  • An embodiment also provides a battery pole piece forming method, which is suitable for the above-mentioned battery pole piece forming equipment, and the battery pole piece forming method includes:
  • the first film sheet and the second film sheet are respectively rolled on both sides of the substrate.
  • Fig. 1 is the structural representation of the pole piece forming equipment provided by the application;
  • Fig. 2 is the cross-sectional schematic diagram of the pole piece forming equipment provided by the application;
  • FIG. 3 is a front view of the pole piece forming equipment provided by the application.
  • FIG. 4 is a flow chart of a method for forming a battery pole piece provided by the present application.
  • Support frame 11. Horizontal support plate; 111, Extension plate; 1111, Fourth chute; 12, Vertical support plate; 121, Third chute;
  • Feeding mechanism 31. Feeding hopper;
  • the first installation assembly 51, the first installation structure; 52, the second installation structure; 53, the first fixing member;
  • the first driving structure 61.
  • the first runner 62.
  • the first connecting rod 62.
  • Second mounting assembly 71. Supporting structure; 711, First part; 712, Second part; 713, Third part; 72, Third mounting structure; 73, Fourth mounting structure; 74, Second fixing member ;
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • connection may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • a first feature "on” or “under” a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes the first feature is directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.
  • this embodiment provides a battery pole piece forming equipment
  • the battery pole piece forming equipment includes a conveying mechanism 2 configured to convey a substrate 100 , a conveying mechanism 3 and a rolling mechanism 4 .
  • the pressing mechanism 4 includes a first pressing roller 41, a second pressing roller 42, a third pressing roller 43 and a fourth pressing roller 44 which are arranged side by side in sequence.
  • the distance between the pressing roller 43 and the fourth pressing roller 44 is the same, and the substrate 100 is inserted between the second pressing roller 42 and the third pressing roller 43 in the vertical direction, the first pressing roller 41 and the second pressing roller 42
  • the active material particles conveyed by the feeding mechanism 3 can be rolled to form the first film sheet
  • the third pressing roller 43 and the fourth pressing roller 44 can be rolled to form the active material particles conveyed by the feeding mechanism 3 to form the second film sheet
  • the The second pressing roller 42 and the third pressing roller 43 can roll the first film sheet and the second film sheet on both sides of the substrate 100 respectively.
  • the rotation directions of the first pressure roller 41 and the third pressure roller 43 are opposite, and the rotation directions of the second pressure roller 42 and the fourth pressure roller 44 are opposite.
  • the film is attached to the second pressing roller 42, the second film formed by the rolling of the third pressing roller 43 and the fourth pressing roller 44 is attached to the third pressing roller 43, and then the second pressing roller 42 and the third pressing roller 44
  • the pressing rollers 43 roll the first film sheet and the second film sheet on both sides of the substrate 100 respectively. In this way, the thicknesses of the first membrane sheet and the second membrane sheet respectively located on both sides of the substrate 100 can be kept the same, so that the thickness of the formed battery pole pieces is uniform, and the active material particles are rolled to form the membrane sheet and the battery.
  • the roll forming of the pole pieces is carried out at the same time, which can improve the forming efficiency of the battery pole pieces.
  • the temperature of the first pressing roller 41 is higher than that of the second pressing roller 42 .
  • the temperature of the first pressing roller 41 is 40°C-300°C
  • the temperature of the second pressing roller 42 is room temperature, so that the first film sheet can be better attached to the second pressing roller after roll forming. on roller 42.
  • the temperature of the fourth pressing roller 44 is higher than that of the third pressing roller 43, the temperature of the fourth pressing roller 44 is 40°C-300°C, and the temperature of the fourth pressing roller 44 is The temperature of the three pressing rollers 43 is room temperature, so that the second film 42 can be better attached to the third pressing roller 43 after being rolled and formed.
  • the roughness of the first pressing roll 41 , the second pressing roll 42 , the third pressing roll 43 and the fourth pressing roll 44 is all 0.4 ⁇ m-0.8 ⁇ m.
  • the above-mentioned feeding mechanism 3 includes at least two feeding hoppers 31 , wherein the feeding port of at least one feeding hopper 31 is located between the first pressing roller 41 and the second pressing roller 42 and is arranged on the first pressing roller 41 and the second pressing roller 42 , wherein the feeding port of at least one feeding hopper 31 is located between and above the third pressing roller 43 and the fourth pressing roller 44 .
  • the feeding mechanism 3 includes two feeding hoppers 31 . It can be understood that the roll forming of the first film sheet and the second film sheet is carried out by the corresponding feeding hoppers 31 alone to transport the active material particles, so that when the feeding speeds of the two feeding hoppers 31 are the same, the active material can be guaranteed. The uniformity of particle conveying can further ensure the consistency of the thickness of the first film sheet and the second film sheet.
  • the number of the above-mentioned feeding hoppers 31 can also be more than two.
  • the above-mentioned conveying mechanism 2 includes a first support member 21 and a second support member 22.
  • the first support member 21 can support the base material coil
  • the second support member 22 is provided with a winding roller.
  • the substrate 100 can be driven to pass between the second pressing roller 42 and the third pressing roller 43 .
  • the conveying mechanism 2 further includes two first support rollers 23 arranged to support the substrate 100 , and the two first support rollers 23 are arranged up and down, so that a part of the substrate 100 located between the two first support rollers 23 is vertically arranged. In one embodiment, under the action of the two first support rollers 23 , part of the substrate 100 located between the two first support rollers 23 is vertically penetrated between the second pressure roller 42 and the third pressure roller 43 . so that the second pressing roller 42 and the third pressing roller 43 roll the first film sheet and the second film sheet on both sides of the substrate 100 respectively.
  • the above-mentioned conveying mechanism 2 further includes a second support roller 24 and a third support roller 25 , and there are at least one second support roller 24 and at least one third support roller between the first support member 21 and the rolling mechanism 4 .
  • Support and tension In this embodiment, a second support roller 24 and two third support rollers 25 are disposed between the first support member 21 and the rolling mechanism 4 . In one embodiment, as shown in FIG.
  • the second support roller The rollers 24 are located between the two third support rollers 25 , and the second support rollers 24 are located vertically below the two third support rollers 25 .
  • a second support roller 24 and two third support rollers 25 are disposed between the second support member 22 and the rolling mechanism 4 , and the second support roller 24 is located between the two third support rollers 25 in the vertical direction.
  • the upper part is located below the two third support rollers 25 .
  • the substrate 100 is wound under the two second support rollers 24 .
  • the position of the second support roller 24 in the vertical direction can be adjusted.
  • the substrate 100 can be tensioned by adjusting the positions of the two second support rollers 24 in the vertical direction.
  • the third support roller 25 can also be set to be adjustable in position in the vertical direction, and the substrate 100 can be tensioned by adjusting the position of the third support roller 25 .
  • the pole piece forming apparatus provided in this embodiment further includes a support frame 1 .
  • the above-mentioned support frame 1 includes a horizontal support plate 11 and a vertical support plate 12 , and the vertical support plate 12 is vertically connected to the horizontal support plate 11 .
  • the first support member 21 , the second support member 22 , the first support roller 23 , the second support roller 24 and the third support roller 25 are all disposed on the vertical support plate 12 .
  • the vertical support plate 12 is provided with a plurality of linear guide rails extending in the vertical direction, the plurality of vertical guide rails are respectively provided corresponding to the two second support rollers 24 , and the second support rollers 24 are slidably arranged on the linear guide rails so that it can move in the vertical direction.
  • the position of the upper one of the two first support rollers 23 in the horizontal direction is adjustable, and the position of the first support roller 23 at the bottom in the vertical direction can be adjusted Then, by adjusting the position of the first support roller 23 located below in the vertical direction to avoid interference between the substrate 100 and the first pressing roller 41, by adjusting the position of the first support roller 23 located above in the horizontal direction , the verticality of the part of the base material 100 located between the two first support rollers 23 can be adjusted.
  • the vertical support plate 12 is provided with a third chute 121 along the horizontal direction, and the upper one of the two first support rollers 23 is slidably arranged in the third chute 121 .
  • the horizontal support plate 11 has an extension plate 111 extending in the vertical direction, the extension plate 111 is provided with a fourth chute 1111 extending in the vertical direction, and one of the two first support rollers 23 located below the first supports The roller 23 is slidably arranged in the fourth chute 1111 .
  • the horizontal direction is the ab direction in FIG. 2
  • the vertical direction is the cd direction in FIG. 2 .
  • the battery pole piece forming apparatus further includes a first driving mechanism and a first mounting assembly 5 , the first pressing roller 41 and the second pressing roller 42 are mounted on the first mounting assembly 5 , and the first driving mechanism The mechanism can drive the first pressing roller 41 to move toward or away from the second pressing roller 42 .
  • the first mounting assembly 5 includes two first mounting structures 51 arranged oppositely and two second mounting structures 52 arranged oppositely, and the first pressing roller 41 is rotatably mounted on the two first mounting structures 51 , the second pressing roller 42 is rotatably installed between the two second installation structures 52 .
  • each second installation structure 52 is provided with a first chute, each first installation structure 51 is slidably disposed in the corresponding first chute, and the first drive mechanism can push the first installation. The structure 51 slides along the corresponding first chute, thereby driving the first pressing roller 41 to approach or move away from the second pressing roller 42 .
  • the first mounting assembly 5 further includes two first fixing members 53 , and the two first fixing members 53 are respectively connected to the two second mounting structures 52 .
  • the above-mentioned first driving mechanism includes two first driving structures 6 , and the two first driving structures 6 are respectively configured to drive the two first mounting structures 51 to slide.
  • the first driving structure 6 includes a connected first runner 61 and a first connecting rod 62 , the first connecting rod 62 is connected to the first mounting structure 51 through the corresponding first fixing member 53 , and the first connecting rod 62 is A connecting rod 62 is threadedly connected to the first fixing member 53, and the corresponding first mounting structure 51 can be driven to slide along the corresponding first chute by rotating the first runner 61, so as to realize the pressure on the first pressing roller 41 and the second pressing roller 41. Adjustment of the distance between the rollers 42 .
  • the above-mentioned second mounting structure 52 and the first fixing member 53 are mounted on the horizontal support plate 11 .
  • the first mounting structure 51 includes a first mounting block.
  • the first mounting structure 51 includes a first mounting block, and the first pressing roller 41 is mounted between the two first mounting blocks.
  • the first mounting structure 51 may further include a plurality of first mounting blocks.
  • the second mounting structure 52 includes a second mounting block, the second mounting structure 52 includes a second mounting block, and the second pressing roller 42 is mounted between the two second mounting blocks.
  • the second mounting structure 52 may further include a plurality of second mounting blocks.
  • the first driving mechanism may also drive the second pressing roller 42 to move toward or away from the first pressing roller 41 .
  • the first installation assembly 5 includes two oppositely arranged fifth installation structures and two oppositely arranged sixth installation structures, wherein the first pressing roller 41 is installed between the two fifth installation structures, The second pressing roller 42 is mounted between the two sixth mounting structures.
  • the above-mentioned first driving mechanism includes two fourth driving mechanisms, and the two fourth driving structures can respectively drive the two sixth mounting structures to move toward or away from the corresponding fifth mounting structures.
  • the fourth driving mechanism may be a structure such as an air cylinder, a motor lead screw, etc., and only needs to be capable of driving the sixth installation structure, which is not specifically limited in this embodiment.
  • the first driving structure can drive the first pressing roller 41 and the second pressing roller 42 to move at the same time, so that the first pressing roller 41 and the second pressing roller 42 are close to or away from each other.
  • Structure There is no specific limitation in this embodiment, as long as the first pressing roller 41 and the second pressing roller 42 can be simultaneously driven to move at the same time.
  • the battery pole piece forming apparatus further includes a second driving mechanism and a second mounting assembly 7 slidably arranged on the horizontal support plate 11 .
  • the third pressing roller 43 and the fourth pressing roller 44 are mounted on the
  • the second driving mechanism can drive the second mounting assembly 7 to move toward or away from the second pressing roller 42 .
  • the second installation assembly 7 includes two supporting structures 71 arranged opposite to each other, and the third pressing roller 43 and the fourth pressing roller 44 are installed between the two supporting structures 71 .
  • the second mounting assembly 7 further includes two second fixing members 74 , and the two second fixing members 74 correspond to the two supporting structures 71 respectively.
  • the two second fixing members 74 are fixedly arranged on the horizontal supporting plate 11 , and the two supporting structures 71 are slidably arranged on the horizontal supporting plate 11 .
  • a limit groove is provided on the horizontal support plate 11 corresponding to each support structure 71 , and the support structure 71 is slidably disposed in the corresponding limit groove.
  • the support structure 71 is provided with rollers. By providing the rollers, the sliding of the support structure 71 relative to the horizontal support plate 11 is changed into rolling, so that the frictional force between the support structure 71 and the horizontal support plate 11 can be reduced.
  • the second driving mechanism includes two second driving structures 8 , and the two second driving structures 8 are respectively configured to drive the two supporting structures 71 to move.
  • the second driving structure 8 includes a connected second runner 81 and a second connecting rod 82 , and the second connecting rod 82 is connected to the corresponding supporting structure 71 through the corresponding second fixing member 74 .
  • the two connecting rods 82 are threadedly connected to the second fixing member 74 .
  • the second mounting assembly 7 further includes two oppositely disposed third mounting structures 72 and two oppositely disposed fourth mounting structures 73 , and the third pressing roller 43 is mounted between the two third mounting structures 72 .
  • the fourth pressing roller 44 is installed between the two fourth installation structures 73, and each support structure 71 is provided with a third installation structure 72 and a fourth installation structure 73, wherein the third installation structure 72 is fixedly arranged on the On the corresponding support structure 71 , the fourth installation structure 73 is slidably disposed on the corresponding support structure 71 .
  • the support structure 71 has a second chute, and the fourth mounting structure 73 is slidably disposed in the second chute.
  • the battery pole piece forming equipment further includes a third driving mechanism, the third driving mechanism includes two third driving structures 9, and the two third driving structures 9 are respectively arranged to drive the two fourth mounting structures 73 along the corresponding second sliding The slot slides to move toward or away from the third mounting structure 72 .
  • the third driving structure 9 includes a driving member, a pushing block 93 and a first elastic member, and the driving member can drive the pushing block 93 to move in a vertical direction.
  • the driving member includes a third runner 91 and a third connecting rod 92 .
  • the third runner 91 is connected to the third connecting rod 92, the third connecting rod 92 is vertically arranged, the first end of the third connecting rod 92 is connected to the pushing block 93 through the support structure 71, and the third connecting rod 92 is threadedly connected to the
  • the support structure 71 the second end of the third connecting rod 92 is provided with a third wheel 91
  • the push block 93 is located in the second chute
  • the first elastic member is provided between the third mounting structure 72 and the fourth mounting structure 73 .
  • the pushing block 93 is provided with a first inclined surface
  • the fourth mounting structure 73 is provided with a second inclined surface abutting against the first inclined surface.
  • the push block 93 slides down along the second slope, and at the same time pushes the fourth mounting structure 73 to move toward the direction close to the third mounting structure 72 , so that the distance between the third pressing roller 43 and the fourth pressing roller 44 is reduced. During this process, the first elastic member is compressed.
  • the third mounting structure 72 includes a third mounting block, the third mounting structure 72 includes one third mounting block, and the third pressing roller 43 is mounted between the two third mounting blocks.
  • the third mounting structure 72 may further include a plurality of third mounting blocks.
  • the fourth mounting structure 73 includes a fourth mounting block, the fourth mounting structure 73 includes one fourth mounting block, and the fourth pressing roller 44 is mounted between the two fourth mounting blocks.
  • the fourth mounting structure 73 may further include a plurality of fourth mounting blocks.
  • the third pressure roller 43 may also be installed between the two fourth installation structures 73, and the fourth pressure roller 44 may be installed between the two third installation structures 72.
  • the third drive mechanism Two third driving structures 9 are included, and each third driving structure 9 can drive the third pressing roller 43 to move toward or away from the fourth pressing roller 44 .
  • the third mounting structure 72 is slidably arranged on the corresponding supporting structure 71, and the fourth mounting structure 73 is fixedly arranged on the corresponding supporting structure 71, and the third driving mechanism includes two third driving structures 9, each of which drives The structure 9 can drive the corresponding third mounting structure 72 to move toward or away from the fourth mounting structure 73 .
  • the third mounting structure 72 and the fourth mounting structure 73 can be slidably disposed on the corresponding supporting structure 71. It can be understood that, at this time, the third driving mechanism includes four third driving structures 9, each of which is mounted on the third mounting structure 9.
  • the structure 72 corresponds to one third driving structure 9
  • each fourth mounting structure 73 corresponds to one third driving structure 9 .
  • the above-mentioned third driving structure 9 further includes a second elastic member 94 , and the second elastic member 94 is disposed between the pushing block 93 and the supporting structure 71 .
  • the second elastic member 94 By providing the second elastic member 94, the movement of the push block 93 can be buffered and supported, so that the position of the push block 93 can be kept stable when the rotation of the third wheel 91 is stopped, so that the third pressing roller The distance between 43 and the fourth pressing roller 44 remains stable.
  • the support structure 71 includes a first part 711 , a second part 712 and a third part 713 , and the second part 712 is vertically connected to the first part 711 and the third part 713 Vertically connected to the second part 712 , the above-mentioned second chute is formed between the first part 711 , the second part 712 and the third part 713 .
  • the first portion 711 is located in the limiting groove, and the first portion 711 is provided with a roller.
  • the second connecting rod 82 is threadedly connected to the second portion 712 , and one surface of the pushing block 93 abuts against the second portion 712 .
  • the third connecting rod 92 is connected to the pushing block 93 through the third portion 713 , and the third connecting rod 92 is threadedly connected to the third portion 713 .
  • one end of the first pressing roller 41 is connected with a first gear 45
  • One end of the second pressure roller 42 is connected with a second gear 46
  • one end of the third pressure roller 43 is connected with a third gear 47
  • one end of the fourth pressure roller 44 is connected with a fourth gear 48 , wherein the first gear 45 and the second gear 46 are in phase. Meshing, the second gear 46 and the third gear 47 are meshed, and the third gear 47 and the fourth gear 48 are meshed.
  • the first pressing roller 41 and the second pressing roller 42 rolls the active material particles to form the first film sheet
  • the third pressure roll 43 and the fourth pressure roll 44 rolls the active material particles to form the second film sheet
  • the second pressure roll 42 and the third pressure roll 43 respectively roll the first film sheet.
  • a film sheet and a second film sheet are rolled on both sides of the base material 100.
  • the thicknesses of the first film sheet and the second film sheet respectively located on both sides of the base material 100 can be made the same, thereby ensuring the formation of The thickness of the battery pole piece is uniform, which avoids the occurrence of short circuit caused by the drop of active material during the operation of the lithium ion, and improves the safety performance of the lithium ion battery.
  • This embodiment also provides a method for forming a battery pole piece. As shown in FIG. 4 , the method for forming a battery pole piece includes the following steps:
  • the first film sheet and the second film sheet are rolled on both sides of the base material 100, respectively.
  • the rolling of the active material and the forming of the battery pole piece are carried out step by step.
  • the active material particles are rolled through the first pressing roller 41 and the second pressing roller 42 to form the first film sheet, and then the third The pressing roller 43 and the fourth pressing roller 44 are rolled to form a second film sheet, the thickness of the first film sheet and the second film sheet are the same, and then the first film sheet and the second film sheet are respectively pressed by the second pressing roller 42 and the third pressing roller 43
  • the second film sheet is rolled on both sides of the base material 100 , which can improve the consistency of the thickness of the first film sheet and the second film sheet, thereby ensuring that the first film sheet and the second film sheet are rolled on the base material 100 .
  • the thickness of the battery pole pieces formed afterward is uniform, so as to avoid the subsequent short circuit caused by the drop of the active material during the working process of the lithium ion battery, and improve the safety performance of the lithium ion battery.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
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Abstract

一种电池极片成型设备及成型方法，电池极片成型设备包括设置为输送基材（100）的输送机构（2）、输料机构（3）以及辊压机构（4），辊压机构（4）包括依次并排设置的第一压辊（41）、第二压辊（42）、第三压辊（43）和第四压辊（44），第一压辊（41）和第二压辊（42）之间的间距与第三压辊（43）和第四压辊（44）之间的间距相同，第二压辊（42）和第三压辊（43）设置为使基材（100）沿竖直方向穿过第二压辊（42）和第三压辊（43）之间，第一压辊（41）和第二压辊（42）设置为辊压由输料机构（3）输送的活性物质颗粒形成第一膜片，第三压辊（43）和第四压辊（44）设置为辊压由输料机构（3）输送的活性物质颗粒形成第二膜片，第二压辊（42）和第三压辊（43）设置为将第一膜片和第二膜片分别辊压于基材（100）的两侧。

Description

电池极片成型设备及成型方法
本申请要求申请日为2021年1月13日、申请号为202110042215.X的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池极片生产设备技术领域，例如涉及一种电池极片成型设备及成型方法。
背景技术
锂离子电池的能量密度大，已被应用于手机、笔记本型电脑等领域，但伴随用途的扩大、发展，要求低电阻化、大容量化等进一步性能的提高。
锂离子电池电极能够以电池极片的形式获得，例如，为了由包含电极活性物质的粉体制造电池极片等压延片，已进行了使用粉体压延装置的粉体的压缩成型。在粉体压延装置中，在基材的两侧分别通过一个加压用辊将粉体压缩成型而得到电池极片，但是基材在传输过程中容易发生抖动而导致基材两侧的粉体厚度不同，这就使得在后期工作过程中，电池极片不同区域的膨胀情况不同而使得粉体容易从基材上脱落，影响后续锂离子电池的正常工作。
发明内容
本申请提供了一种电池极片成型设备及成型方法，能够解决相关技术中存在的电池极片的基材两侧的粉体的厚度不同，影响后续锂离子电池正常工作的问题。
一种电池极片成型设备，包括用于输送基材的输送机构、输料机构以及辊压机构，所述辊压机构包括依次并排设置的第一压辊、第二压辊、第三压辊和第四压辊，所述第一压辊和所述第二压辊之间的间距与所述第三压辊和所述第四压辊之间的间距相同，所述基材沿竖直方向穿设于所述第二压辊和所述第三压辊之间，所述第一压辊和所述第二压辊能够辊压由所述输料机构输送的活性物质颗粒形成第一膜片，所述第三压辊和所述第四压辊能够辊压由所述输料机构输送的活性物质颗粒形成第二膜片，所述第二压辊和所述第三压辊能够将所述第一膜片和所述第二膜片分别辊压于所述基材的两侧。
一实施例还提供了一种电池极片成型方法，适用于上述电池极片成型设备，该电池极片成型方法包括：
辊压活性物质颗粒形成厚度相同的第一膜片和第二膜片；及
将所述第一膜片和所述第二膜片分别辊压于基材的两侧。
附图说明
图1是本申请提供的极片成型设备的结构示意图；
图2是本申请提供的极片成型设备的剖视示意图；
图3是本申请提供的极片成型设备的主视图；
图4是本申请提供的电池极片成型方法的流程图。
图中：
1、支撑架；11、水平支撑板；111、延伸板；1111、第四滑槽；12、竖直支撑板；121、第三滑槽；
2、输送机构；21、第一支撑件；22、第二支撑件；23、第一支撑辊；24、第二支撑辊；25、第三支撑辊；
3、输料机构；31、输料斗；
4、辊压机构；41、第一压辊；42、第二压辊；43、第三压辊；44、第四压辊；45、第一齿轮；46、第二齿轮；47、第三齿轮；48、第四齿轮；
5、第一安装组件；51、第一安装结构；52、第二安装结构；53、第一固定件；
6、第一驱动结构；61、第一转轮；62、第一连接杆；
7、第二安装组件；71、支撑结构；711、第一部；712、第二部；713、第三部；72、第三安装结构；73、第四安装结构；74、第二固定件；
8、第二驱动结构；81、第二转轮；82、第二连接杆；
9、第三驱动结构；91、第三转轮；92、第三连接杆；93、推动块；94、第二弹性件；
100、基材。
具体实施方式
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成 一体；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或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本实施例的描述中，术语“上”、“下”、“右”、等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，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。此外，术语“第一”、“第二”仅仅用于在描述上加以区分，并没有特殊的含义。
如图1至图3所示，本实施例提供一种电池极片成型设备，该电池极片成型设备包括设置为输送基材100的输送机构2、输料机构3以及辊压机构4，辊压机构4包括依次并排设置的第一压辊41、第二压辊42、第三压辊43和第四压辊44，第一压辊41和第二压辊42之间的间距与第三压辊43和第四压辊44之间的间距相同，基材100沿竖直方向穿设于第二压辊42和第三压辊43之间，第一压辊41和第二压辊42能够辊压由输料机构3输送的活性物质颗粒形成第一膜片，第三压辊43和第四压辊44能够辊压由输料机构3输送的活性物质颗粒形成第二膜片，第二压辊42和第三压辊43能够将第一膜片和第二膜片分别辊压于基材100的两侧。
上述第一压辊41和第三压辊43的转动方向相反，第二压辊42和第四压辊44的转动方向相反，第一压辊41和第二压辊42辊压形成的第一膜片附在该第二压辊42上，第三压辊43和第四压辊44辊压形成的第二膜片附在该第三压辊43上，随后第二压辊42和第三压辊43分别将第一膜片和第二膜片辊压于基材100的两侧。如此设置，能够使得分别位于基材100两侧的第一膜片和第二膜片的厚度保持相同，从而使得形成的电池极片的厚度均匀，并且将活性物质颗粒辊压形成膜片和电池极片的辊压成型同时进行，能够提高电池极片的成型效率。
在一实施例中，为了使第一膜片能够更好地附在第二压辊42上，第一压辊41的温度大于第二压辊42的温度。在本实施例中，第一压辊41的温度为40℃-300℃，第二压辊42的温度为室温，从而使得第一膜片在辊压成型后能够更好地附在第二压辊42上。为了使第二膜片能够更好地附在第三压辊43上，第四压辊44的温度大于第三压辊43的温度，第四压辊44的温度为40℃-300℃，第三压辊43的温度为室温，从而使得第二膜片42辊压成型后能够更好地附在第三压辊43上。
在本实施中，第一压辊41、第二压辊42、第三压辊43和第四压辊44的粗糙度均为0.4μm-0.8μm。
如图1所示，上述输料机构3包括至少两个输料斗31，其中至少一个输料斗31的输料口位于第一压辊41和第二压辊42之间且设置于第一压辊41和第二压辊42上方，其中至少一个输料斗31的输料口位于第三压辊43和第四压辊44之间且设置于第三压辊43和第四压辊44上方。在本实施例中，输料机构3包括两个输料斗31。可以理解的是，第一膜片和第二膜片的辊压成型均单独由对应的输料斗31输送活性物质颗粒，使得两个输料斗31的输料速度相同的情况下，能够保证活性物质颗粒输送的均匀性，从而进一步保证第一膜片和第二膜片厚度的一致性，当然，上述输料斗31也可以为两个以上。
在一实施例中，上述输送机构2包括第一支撑件21和第二支撑件22，第一支撑件21能够支撑基材卷材，第二支撑件22上设置有卷绕辊，卷绕辊能够带动基材100由第二压辊42和第三压辊43之间穿过。输送机构2还包括两个设置为支撑基材100的第一支撑辊23，两个第一支撑辊23上下布置，使得位于两个第一支撑辊23之间的一部分基材100竖直设置。在一实施例中，在两个第一支撑辊23的作用下，位于两个第一支撑辊23之间的部分基材100竖直穿设于第二压辊42和第三压辊43之间，从而使得第二压辊42和第三压辊43分别将第一膜片和第二膜片分别辊压于基材100的两侧。
在一实施例中，上述输送机构2还包括第二支撑辊24和第三支撑辊25，第一支撑件21和辊压机构4之间具有至少一个第二支撑辊24和至少一个第三支撑辊25，第二支撑件22和辊压机构4之间具有至少一个第二支撑辊24和至少一个第三支撑辊25，通过第二支撑辊24和第三支撑辊25能够对基材100进行支撑和张紧。在本实施例中，第一支撑件21和辊压机构4之间设置有一个第二支撑辊24和两个第三支撑辊25，在一实施例中，如图3所示，第二支撑辊24位于两个第三支撑辊 25之间，且第二支撑辊24在竖直方向上位于两个第三支撑辊25的下方。第二支撑件22和辊压机构4之间设置有一个第二支撑辊24和两个第三支撑辊25，第二支撑辊24位于两个第三支撑辊25之间，且在竖直方向上位于两个第三支撑辊25的下方。在本实施例中，基材100绕设于两个第二支撑辊24的下方。
在本实施例中，第二支撑辊24在竖直方向的位置均可调。通过将第二支撑辊24设置为在竖直方向上的位置可调，能够通过调整两个第二支撑辊24在竖直方向的位置来张紧基材100。当然在其他实施例中，也可以将第三支撑辊25设置为在竖直方向上位置可调，通过调整第三支撑辊25的位置来张紧基材100。
在一实施例中，如图1和图2所示，本实施例提供的极片成型设备还包括支撑架1。上述支撑架1包括水平支撑板11和竖直支撑板12，竖直支撑板12垂直连接于水平支撑板11。上述第一支撑件21、第二支撑件22、第一支撑辊23、第二支撑辊24和第三支撑辊25均设置于竖直支撑板12上。
在本实施例中，竖直支撑板12设置有沿竖直方向延伸的多个直线导轨，多个竖直导轨分别对应两个第二支撑辊24设置，第二支撑辊24滑动设置于直线导轨上，从而能够在竖直方向上进行移动。此外，在本实施例中，两个第一支撑辊23中位于上方的一个第一支撑辊23在水平方向上的位置可调，位于下方的第一支撑辊23在竖直方向上的位置可调，进而通过调整位于下方的第一支撑辊23在竖直方向上的位置来避免基材100和第一压辊41产生干涉，通过调整位于上方的第一支撑辊23在水平方向上的位置，能够调整位于两个第一支撑辊23之间的部分基材100的垂直度。在一实施例中，在竖直支撑板12上沿水平方向开设有第三滑槽121，两个第一支撑辊23中位于上方的一个第一支撑辊23滑动设置于第三滑槽121内。在水平支撑板11上具有沿竖直方向延伸的延伸板111，延伸板111上开设有沿竖直方向延伸的第四滑槽1111，两个第一支撑辊23中位于下方的一个第一支撑辊23滑动设置于第四滑槽1111内。其中，水平方向为图2中的ab方向，竖直方向为图2中的cd方向。
如图1至图3所示，该电池极片成型设备还包括第一驱动机构和第一安装组件5，第一压辊41和第二压辊42安装于第一安装组件5，第一驱动机构能够驱动第一压辊41向靠近或远离第二压辊42的方向移动。
在本实施例中，第一安装组件5包括两个相对设置的第一安装结构51和两个相对设置的第二安装结构52，第一压辊41能够转动地安装于两个第一安装结构51之间，第二压辊42能够转动地安装于两个第二安装结构52之间。在一实施例 中，每个第二安装结构52上开设有第一滑槽，每个第一安装结构51能够滑动地设置于对应的第一滑槽内，第一驱动机构能够推动第一安装结构51沿对应的第一滑槽滑动，从而带动第一压辊41靠近或远离第二压辊42。
在一实施例中，第一安装组件5还包括两个第一固定件53，两个第一固定件53分别连接于两个第二安装结构52。上述第一驱动机构包括两个第一驱动结构6，两个第一驱动结构6分别设置为驱动两个第一安装结构51滑动。在一实施例中，第一驱动结构6包括相连接的第一转轮61和第一连接杆62，第一连接杆62穿过对应的第一固定件53连接于第一安装结构51，第一连接杆62螺纹连接于第一固定件53，通过转动第一转轮61可驱动对应的第一安装结构51沿对应的第一滑槽滑动，从而实现对第一压辊41和第二压辊42之间距离的调整。
在本实施例中，上述第二安装结构52和第一固定件53安装于水平支撑板11。此外，在本实施例中，第一安装结构51包括第一安装块。第一安装结构51包括一个第一安装块，第一压辊41安装于两个第一安装块之间。当然在其他实施例中，第一安装结构51还可包括多个第一安装块。另外，在本实施例中，第二安装结构52包括第二安装块，第二安装结构52包括一个第二安装块，第二压辊42安装于两个第二安装块之间。当然在其他实施例中，第二安装结构52还可包括多个第二安装块。
当然在其他实施例中，也可以是第一驱动机构驱动第二压辊42向靠近或远离第一压辊41的方向移动。在一实施例中，第一安装组件5包括两个相对设置的第五安装结构和两个相对设置的第六安装结构，其中，第一压辊41安装于两个第五安装结构之间，第二压辊42安装于两个第六安装结构之间。上述第一驱动机构包括两个第四驱动机构，两个第四驱动结构能够分别驱动两个第六安装结构向靠近或远离对应的第五安装结构的方向移动。第四驱动机构可以为气缸、电机丝杠等结构，能够实现对第六安装结构的驱动即可，本实施例不做具体限制。在一实施例中，第一驱动结构能够驱动第一压辊41和第二压辊42同时移动，从而使得第一压辊41和第二压辊42相互靠近或远离，第一驱动结构的具体结构本实施例不做具体限制，只要能实现同时驱动第一压辊41和第二压辊42同时移动即可。
如图1至图3所示，该电池极片成型设备还包括第二驱动机构和滑动设置于水平支撑板11上的第二安装组件7，第三压辊43和第四压辊44安装于第二安装组件7，第二驱动机构能够驱动第二安装组件7向靠近或远离第二压辊42的方向移 动。在本实施例中，第二安装组件7包括两个相对设置的支撑结构71，第三压辊43和第四压辊44安装于两个支撑结构71之间。第二安装组件7还包括两个第二固定件74，两个第二固定件74分别对应两个支撑结构71。两个第二固定件74均固定设置于水平支撑板11上，两个支撑结构71能够滑动地设置于水平支撑板11上。在一实施例中，为了使得支撑结构71能够稳定滑动，水平支撑板11上对应每个支撑结构71设置有限位槽，支撑结构71滑动设置于对应的限位槽内。在一实施例中，为了减少支撑结构71与水平支撑板11之间的摩擦力，支撑结构71上设置有滚轮。通过设置滚轮，将支撑结构71相对水平支撑板11的滑动变为滚动，能够使得支撑结构71与水平支撑板11之间的摩擦力降低。
第二驱动机构包括两个第二驱动结构8，两个第二驱动结构8分别设置为驱动两个支撑结构71移动。在一实施例中，第二驱动结构8包括相连接的第二转轮81和第二连接杆82，第二连接杆82穿过对应的第二固定件74连接于对应的支撑结构71，第二连接杆82螺纹连接于第二固定件74。通过转动第二转轮81可驱动对应的支撑结构71移动，从而能够通过两个第二驱动结构8分别驱动两个支撑结构71移动，进而带动第二安装组件7整体进行移动，实现对第二压辊42和第三压辊43之间距离的调整。
在本实施例中，第二安装组件7还包括两个相对设置的第三安装结构72和两个相对设置的第四安装结构73，第三压辊43安装于两个第三安装结构72之间，第四压辊44安装于两个第四安装结构73之间，每个支撑结构71上设置有一第三安装结构72和一个第四安装结构73，其中，第三安装结构72固定设置于对应的支撑结构71上，第四安装结构73能够滑动地设置于对应的支撑结构71上。
在一实施例中，支撑结构71上具有第二滑槽，第四安装结构73能够滑动地设置于第二滑槽内。该电池极片成型设备还包括第三驱动机构，第三驱动机构包括两个第三驱动结构9，两个第三驱动结构9分别设置为驱动两个第四安装结构73沿对应的第二滑槽滑动而向靠近或远离第三安装结构72的方向移动。在一实施例中，第三驱动结构9包括驱动件、推动块93和第一弹性件，驱动件能够驱动推动块93沿竖直方向移动。在一实施例中，驱动件包括第三转轮91和第三连接杆92。其中第三转轮91连接于第三连接杆92，第三连接杆92竖直设置，第三连接杆92第一端穿过支撑结构71连接于推动块93，第三连接杆92螺纹连接于支撑结构71，第三连接杆92的第二端设置有第三转轮91，推动块93位于第二滑槽内，第一弹性件设置于第三安装结构72和第四安装结构73之间。在一实施例中， 推动块93上设置有第一斜面，第四安装结构73上设置有与第一斜面相抵接的第二斜面。当转动第三转轮91使得第三连接杆92推动推动块93向下移动时，推动块93沿第二斜面向下滑动，同时推动第四安装结构73向靠近第三安装结构72的方向移动，使得第三压辊43和第四压辊44之间的间距减小。在此过程中，第一弹性件被压缩，当转动第三转轮91使得第三连接杆92带动推动块93向上移动时，推动块93沿第二斜面向上滑动，在第一弹性件的回复原状的弹力作用下，第四安装结构73被推动向远离第三安装结构72的方向移动，使得第三压辊43和第四压辊44之间的间距增大。
在本实施例中，第三安装结构72包括第三安装块，第三安装结构72包括一个第三安装块，第三压辊43安装于两个第三安装块之间。当然在其它实施例中，第三安装结构72还可包括多个第三安装块。此外，在本实施例中，第四安装结构73包括第四安装块，第四安装结构73包括一个第四安装块，第四压辊44安装于两个第四安装块之间。当然在其它实施例中，第四安装结构73还可包括多个第四安装块。
当然在其他实施例中，还可以是第三压辊43安装于两个第四安装结构73之间，第四压辊44安装于两个第三安装结构72之间，此时第三驱动机构包括两个第三驱动结构9，每个第三驱动结构9能够驱动第三压辊43向靠近或远离第四压辊44的方向移动。或者第三安装结构72滑动设置于对应的支撑结构71上，而第四安装结构73固定设置于对应的支撑结构71上，第三驱动机构包括两个第三驱动结构9，每个第三驱动结构9能够驱动对应的第三安装结构72向靠近或远离第四安装结构73的方向移动。再或者第三安装结构72和第四安装结构73能够滑动地设置于对应的支撑结构71上，可以理解的是，此时第三驱动机构包括四个第三驱动结构9，每个第三安装结构72对应一个第三驱动结构9，每个第四安装结构73对应一个第三驱动结构9。
在一实施例中，上述第三驱动结构9还包括第二弹性件94，第二弹性件94设置于推动块93和支撑结构71之间。通过设置第二弹性件94，能够对推动块93的移动进行缓冲，并且对推动块93提供支撑，使得在停止转动第三转轮91时推动块93的位置保持稳定，从而使得第三压辊43和第四压辊44之间的间距保持稳定。
如图1-图3所示，在本实施例中，支撑结构71包括第一部711、第二部712和第三部713，第二部712垂直连接于第一部711，第三部713垂直连接于第二部712，第一部711、第二部712和第三部713之间形成上述第二滑槽。第一部711位于限 位槽内，且第一部711上设置有滚轮。第二连接杆82螺纹连接于第二部712，推动块93的其中一面抵接于第二部712。第三连接杆92穿过第三部713连接于推动块93，且第三连接杆92螺纹连接于第三部713。
如图1所示，为了提高第一压辊41、第二压辊42、第三压辊43和第四压辊44转动的一致性，第一压辊41一端连接有第一齿轮45，第二压辊42一端连接有第二齿轮46，第三压辊43一端连接有第三齿轮47，第四压辊44一端连接有第四齿轮48，其中，第一齿轮45和第二齿轮46相啮合，第二齿轮46和第三齿轮47相啮合，第三齿轮47和第四齿轮48相啮合。
综上，本实施例提供的电池极片成型设备，通过设置第一压辊41、第二压辊42、第三压辊43和第四压辊44，第一压辊41和第二压辊42辊压活性物质颗粒形成第一膜片，第三压辊43和第四压辊44辊压活性物质颗粒形成第二膜片，随后通过第二压辊42和第三压辊43分别将第一膜片和第二膜片辊压于基材100的两侧，相对于相关技术，能够使得分别位于基材100两侧的第一膜片和第二膜片的厚度一致，从而保证形成的电池极片的厚度均匀，避免后续在锂离子工作过程中出现活性物质掉落而导致短路的情况出现，提高锂离子电池的安全性能。
本实施例还提供一种电池极片成型方法，如图4所示，该电池极片成型方法包括以下步骤：
S10中，辊压活性物质颗粒分别形成厚度相同的第一膜片和第二膜片；
S20中，将第一膜片和第二膜片分别辊压于基材100的两侧。
在本实施例中，将活性物质的辊压和电池极片的成型分步进行，首先将活性物质颗粒通过第一压辊41和第二压辊42辊压形成第一膜片，通过第三压辊43和第四压辊44辊压形成第二膜片，第一膜片和第二膜片的厚度相同，随后通过第二压辊42和第三压辊43分别将第一膜片和第二膜片辊压于基材100的两侧，能够提高第一膜片和第二膜片的厚度的一致性，从而保证在将第一膜片和第二膜片辊压于基材100后形成的电池极片厚度均匀，避免后续在锂离子电池工作过程中出现活性物质掉落而导致短路的情况，提高锂离子电池的安全性能。

Claims (13)

  1. 一种电池极片成型设备，包括：
    设置为输送基材(100)的输送机构(2)；
    输料机构(3)；以及
    辊压机构(4)，所述辊压机构(4)包括依次并排设置的第一压辊(41)、第二压辊(42)、第三压辊(43)和第四压辊(44)，所述第一压辊(41)和所述第二压辊(42)之间的间距与所述第三压辊(43)和所述第四压辊(44)之间的间距相同，所述第二压辊(42)和所述第三压辊(43)设置为使所述基材(100)沿竖直方向穿过所述第二压辊(42)和所述第三压辊(43)之间，所述第一压辊(41)和所述第二压辊(42)设置为辊压由所述输料机构(3)输送的活性物质颗粒形成第一膜片，所述第三压辊(43)和所述第四压辊(44)设置为辊压由所述输料机构(3)输送的活性物质颗粒形成第二膜片，所述第二压辊(42)和所述第三压辊(43)设置为将所述第一膜片和所述第二膜片分别辊压于所述基材(100)的两侧。
  2. 根据权利要求1所述的电池极片成型设备，其中，所述第一压辊(41)的温度大于第二压辊(42)所述的温度，所述第四压辊(44)的温度大于所述第三压辊(43)的温度。
  3. 根据权利要求1所述的电池极片成型设备，还包括第一驱动机构和第一安装组件(5)，所述第一压辊(41)和所述第二压辊(42)安装于第一安装组件(5)，第一驱动机构设置为驱动所述第一压辊(41)和所述第二压辊(42)中的至少一个，以使所述第一压辊(41)和所述第二压辊(42)靠近或远离。
  4. 根据权利要求3所述的电池极片成型设备，其中，所述第一安装组件(5)包括两个相对设置的第一安装结构(51)和两个相对设置的第二安装结构(52)，所述第一压辊(41)安装于两个第一安装结构(51)之间，所述第二压辊(42)安装于两个所述第二安装结构(52)之间；所述第一驱动机构包括两个第一驱动结构(6)，每一所述第一驱动结构(6)设置为驱动其中一个所述第一安装结构(51)向靠近或远离所述第二压辊(42)的方向移动。
  5. 根据权利要求3所述的电池极片成型设备，还包括第二驱动机构和第二安装组件(7)，所述第三压辊(43)和所述第四压辊(44)安装于所述第二安装组件(7)上，所述第二驱动机构设置为驱动所述第二安装组件(7)向靠近或远离所述第二压辊(42)的方向移动。
  6. 根据权利要求5所述的电池极片成型设备，其中，所述第二安装组件(7) 包括两个相对设置的支撑结构(71)、两个相对设置的第三安装结构(72)和两个相对设置的第四安装结构(73)，每个所述支撑结构(71)上对应设置有一个所述第三安装结构(72)和一个所述第四安装结构(73)，所述第三压辊(43)和所述第四压辊(44)中的一个安装于两个所述第三安装结构(72)之间，所述第三压辊(43)和所述第四压辊(44)中的另一个安装于两个所述第四安装结构(73)之间，所述第四安装结构(73)和所述第三安装结构(72)中的至少一个设置为滑动地设置于对应的所述支撑结构(71)上，所述支撑结构(71)与所述第二驱动机构连接。
  7. 根据权利要求6所述的电池极片成型设备，还包括第三驱动机构，所述第三驱动机构被配置为驱动所述第四安装结构(73)和所述第三安装结构(72)中的至少一个，以使所述第三压辊(43)和所述第四压辊(44)靠近或远离。
  8. 根据权利要求7所述的电池极片成型设备，其中，所述第三驱动机构包括两个第三驱动结构(9)，每个所述第三驱动结构(9)设置为驱动对应的所述第四安装结构(73)向靠近或远离所述第三安装结构(72)的方向移动。
  9. 根据权利要求8所述的电池极片成型设备，其中，所述第三驱动结构(9)包括驱动件、推动块(93)和第一弹性件，所述驱动件设置为驱动所述推动块(93)沿竖直方向移动，每一所述第三驱动结构(9)的所述第一弹性件设置于对应的所述第三安装结构(72)和所述第四安装结构(73)之间，所述推动块(93)设置为当所述驱动件驱动所述推动块(93)向下移动时，推动所述第四安装结构(73)向靠近对应的所述第三安装结构(72)的方向移动。
  10. 根据权利要求9所述的电池极片成型设备，其中，所述第三驱动结构(9)还包括第二弹性件(94)，所述第二弹性件(94)设置于所述推动块(93)和所述支撑结构(71)之间。
  11. 根据权利要求1所述的电池极片成型设备，其中，所述输料机构(3)包括至少两个输料斗(31)，至少一个所述输料斗(31)的输料口位于所述第一压辊(41)和所述第二压辊(42)之间且设置于所述第一压辊(41)和所述第二压辊(42)的上方，至少一个所述输料斗(31)的输料口位于所述第三压辊(43)和所述第四压辊(44)之间且设置于所述第三压辊(43)和所述第四压辊(44)的上方。
  12. 根据权利要求1所述的电池极片成型设备，其中，所述输送机构(2)包括第一支撑件(21)和第二支撑件(22)，所述第一支撑件(21)设置为支撑基 材卷材，所述第二支撑件(22)上设置有卷绕辊，所述卷绕辊设置为带动所述基材(100)从所述第二压辊(42)和所述第三压辊(43)之间竖直穿过。
  13. 一种电池极片成型方法，适用于权利要求1-11任一项所述的电池极片成型设备，包括：
    辊压活性物质颗粒形成厚度相同的第一膜片和第二膜片；及
    将所述第一膜片和所述第二膜片分别辊压于基材的两侧。
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