CN115763685A

CN115763685A - Pole piece production method and production system

Info

Publication number: CN115763685A
Application number: CN202211399205.2A
Authority: CN
Inventors: 田飞; 陈建江; 李艳斌; 刘付勇; 方送生; 党景
Original assignee: Shenzhen Bak Power Battery Co Ltd
Current assignee: Shenzhen Bak Power Battery Co Ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-03-07

Abstract

The application provides a pole piece production method and a pole piece production system, the pole piece production method compounds the prepared electrode film and the carrier film and then compounds the electrode film and the carrier film with foil, and the production system can implement the pole piece production method. According to the pole piece production method, before the electrode film and the foil are compounded, the electrode film and the carrier film are compounded in a preposed mode, so that a supporting carrier is provided for the electrode film through the carrier film, the tension strength during compounding of the electrode film and the foil is fully improved, the phenomenon of belt breakage is fully avoided, then the carrier film is peeled off from the pole piece, efficient compounding of the electrode film and the foil can be fully completed, and the production efficiency and the product quality are improved; obviously, the production system provided by the application can fully implement the provided pole piece production method, and further achieve the purpose of improving the production efficiency and the product quality.

Description

Pole piece production method and production system

Technical Field

The application belongs to the technical field of electrode production, and particularly relates to a pole piece production method and a pole piece production system.

Background

In the dry production process of the battery pole piece, the electrode film is formed by rolling dispersed and fiberized raw materials and then directly compounded with the aluminum foil, so that although good conductivity and capacitance can be obtained, the electrode film has limited tension, and the phenomenon of band breakage is easy to occur when the electrode film is compounded with the aluminum foil, which is not beneficial to improving the production efficiency and the product quality.

Disclosure of Invention

The embodiment of the application aims to provide a pole piece production method and a pole piece production system, so as to solve the technical problem that a strip is easily broken when an electrode film and an aluminum foil are compounded in the prior art.

In order to achieve the above object, in a first aspect, the present application provides a method for producing a pole piece, including the following steps:

preparing an electrode film;

compounding a carrier film on one surface of the electrode film to prepare a composite film;

compounding composite films on two opposite surfaces of the foil, and attaching electrode films on the composite films to the foil to prepare pole pieces; and

and peeling the carrier film on the pole piece.

According to some embodiments of the present application, one side of the carrier film attached to the electrode film is coated with a release solvent.

According to some embodiments of the present application, the electrode film is heat press-composited with a carrier film.

According to some embodiments of the present application, before preparing the pole piece, the opposite sides of the foil are coated with conductive adhesive and then dried for use in the composite film.

According to some embodiments of the present application, the foil is hot press compounded with the composite film.

According to some embodiments of the present application, the pole piece after peeling off the carrier film and the peeled off carrier film are respectively rolled into a cylinder.

According to some embodiments of the present application, the electrode film is formed by multi-stage hot press molding.

In a second aspect, the present application provides a production system comprising:

a first station for preparing an electrode film;

the second station is used for compounding a carrier film on one surface of the electrode film so as to prepare a composite film;

the third station is used for compounding composite films on two opposite surfaces of the foil to prepare a pole piece; and

and the fourth station is used for stripping the carrier film on the pole piece.

According to some embodiments of the application, the fourth station has two sets of peeling guide structures, and the fixing positions of the two sets of peeling guide structures can be adjusted.

According to some embodiments of the present application, the second station has a coating device for coating a release solvent to one side of the carrier film to which the electrode film is attached.

The application provides a pole piece production method and a production system, which have the beneficial effects that:

compared with the prior art, the electrode film and the carrier film are pre-compounded before the electrode film and the foil are compounded, so that a support carrier is provided for the electrode film through the carrier film, the tension strength during compounding of the electrode film and the foil is fully improved, the phenomenon of belt breakage is fully avoided, then the carrier film is peeled off from the electrode plate, the efficient compounding of the electrode film and the foil can be fully completed, and the production efficiency and the product quality are favorably improved. Obviously, the production system provided by the application can fully implement the provided pole piece production method, and further achieves the purpose of improving the production efficiency and the product quality.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a production flow chart of a pole piece production method provided in an embodiment of the present application;

fig. 2 is a schematic diagram of an operation of a first station and a second station in a production system according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram illustrating operations of a third station and a fourth station in the production system according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an embodiment of a peeling guide structure;

fig. 5 is another schematic operation diagram of a peeling guide structure according to an embodiment of the present disclosure.

Wherein, in the figures, the respective reference numerals:

10. a first station;

100. a quantitative feed hopper; 101. a first hot press roll;

20. a second station;

200. a first unwinding roller; 201. a coating device; 202. a second hot press roll; 203. a first wind-up roll; 204. a first guide roller; 205. a floating roll;

30. a third station;

300. a second unwinding roller; 301. a third unwinding roller; 302. a second guide roller; 303. a third guide roller; 304. a third hot press roll;

40. a fourth station;

400. stripping the guide structure; 401. a fourth guide roller; 402. a second wind-up roll; 403. a fifth guide roller; 404. a third wind-up roll;

4000. a mounting frame; 4001. adjusting a hand wheel; 4002. a screw; 4003. a roller base; 4004. a fixed mount;

50. an electrode film;

60. a carrier film;

70. compounding film;

80. a foil material;

90. and (6) pole pieces.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in operation as a limitation of the application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, a method for manufacturing a pole piece according to an embodiment of the present application will be described.

The pole piece production method provided by the embodiment of the application at least comprises the following steps:

preparing an electrode film 50; compounding a carrier film 60 on one side of the prepared electrode film 50 to prepare a composite film 70; laminating the prepared composite film 70 on two opposite sides of the foil 80, and attaching an electrode film 50 (i.e. the side of the composite film 70 opposite to or far away from the carrier film 60) on the composite film 70 to the foil 80 to prepare a pole piece 90; the carrier film 60 on the pole piece 90 is peeled off.

According to the pole piece production method provided by the embodiment of the application, before the electrode film 50 and the foil 80 are compounded, the carrier film 60 is compounded on one surface of the electrode film 50, so that a support carrier is provided for the electrode film 50 through the carrier film 60, the tensile strength when the electrode film 50 and the foil 80 are compounded is fully improved, the phenomenon of strip breakage is fully avoided, then the carrier film 60 on the pole piece 90 obtained through compounding is peeled off, and the purposes of improving the production efficiency and the product quality can be fully achieved.

In some embodiments of the present disclosure, a release solvent (e.g., a polymeric wax, silicone, etc.) is applied to the side of the carrier film 60 that is bonded to the electrode film 50 before the carrier film 60 and the electrode film 50 are combined.

After the carrier film 60 according to the embodiment of the present application is combined with the electrode film 50, a release coating is formed between the carrier film 60 and the electrode film 50 through a release solvent, and the release coating facilitates the release of the carrier film 60 from the pole piece 90 in the subsequent production process.

In some embodiments of the present application, the electrode film 50 and the carrier film 60 are composited by hot pressing to sufficiently improve the degree of compositing between the electrode film 50 and the carrier film 60.

In some embodiments of the present disclosure, the foil 80 is coated with conductive adhesive on opposite sides thereof and then dried before the foil 80 is combined with the composite film 70.

According to the conductive adhesive provided by the embodiment of the application, the composite effect of the foil 80 and the composite film 70 can be ensured, and the conductivity of the pole piece 90 obtained by compounding can be ensured.

In some embodiments of the present application, the thickness of the conductive paste is selected to be between 2 μm and 3 μm, so as to ensure the conductive performance and simultaneously sufficiently facilitate the recombination.

In some embodiments of the present application, the foil 80 is hot-press compounded with the composite film 70 for substantially improving the compounding effect.

In some embodiments of the present application, referring to fig. 1, the method for manufacturing a pole piece further includes: the pole piece 90 stripped of the carrier film 60 and the stripped carrier film 60 are respectively rolled into a cylinder, so that the pole piece 90 can be packaged quickly and the carrier film 60 can be recovered conveniently.

In some embodiments of the present disclosure, when the electrode film 50 is prepared, the electrode film 50 meeting the process requirements can be dry-formed by quantitatively conveying the fiberized powder material and performing multi-stage hot pressing.

In some embodiments of the present application, the carrier film 60 is made of a high temperature resistant polyester film, such as a PET (Polyethylene terephthalate) protective film, to substantially improve the composite strength of the electrode film 50.

With reference to the embodiments and with reference to fig. 2 and fig. 3, the present application provides a production system to fully implement the above-mentioned pole piece production method.

The production system provided by the embodiment of the application comprises a first station 10, a second station 20, a third station 30 and a fourth station 40, wherein the first station 10 is used for preparing an electrode film 50; the second station 20 is for laminating a carrier film 60 on one side of the electrode film 50 to prepare a laminated film 70; the third station 30 is used for compounding the composite film 70 on two opposite sides of the foil 80 to prepare a pole piece 90; the fourth station 40 is for peeling the carrier film 60 off the pole piece 90.

According to the production system provided by the embodiment of the application, the pole piece production method can be fully implemented through the cooperation of the first station 10, the second station 20, the third station 30 and the fourth station 40, and the phenomenon of belt breakage in the production process of the pole piece 90 is fully avoided in the actual production process, so that the production efficiency and the product quality are favorably improved.

In some embodiments of the present application, referring to fig. 2, the first station 10 has a quantitative feeding hopper 100 and a plurality of sets of first hot press rollers 101 sequentially arranged below a discharge port of the quantitative feeding hopper 100, wherein the quantitative feeding hopper 100 is used for quantitatively delivering the fiberized powder material, and the plurality of sets of first hot press rollers 101 are used for performing multiple hot press molding on the powder material.

It is understood that a first pitch is preset between the two first heat-pressing rollers 101 in each set, and a plurality of such first pitches are sequentially decreased in the feeding direction of the electrode film 50 for heat-pressing to form the electrode film 50 meeting the process requirements.

In some embodiments of the present application, the surface temperature of the first heat and pressure roller 101 is selected to be between 150 ℃ and 220 ℃ for sufficiently improving the heat and pressure composite effect.

In some embodiments of the present application, referring to fig. 2, the second station 20 is disposed near the feeding end of the first station 10, and the second station 20 has a first unwinding roller 200, a coating device 201, two second hot-pressing rollers 202, a first winding roller 203, and a plurality of first guide rollers 204, wherein the first unwinding roller 200 is used for unwinding the carrier film 60, the coating device 201 is disposed near the feeding end of the first unwinding roller 200, the second hot-pressing rollers 202 are disposed near the feeding end of the coating device 201 and the feeding end of the first station 10, the first winding roller 203 is disposed near the feeding end of the second hot-pressing roller 202, and the plurality of first guide rollers 204 are spaced apart in the second station 20 along the feeding direction of the carrier film 60.

According to the second station 20 of the embodiment of the present application, the carrier film 60 is unwound by the first unwinding roller 200, the carrier film 60 is further coated with the release solvent by the coating device 201, the carrier film 60 coated with the release solvent is hot-pressed and laminated with the electrode film 50 by the second hot-pressing roller 202 to prepare the composite film 70, and the composite film 70 obtained by lamination is wound into a roll by the first winding roller 203.

It will be appreciated that the first guide roller 204 is used to guide the carrier film 60 and the laminating film 70 to improve the efficiency of the unwinding, laminating and winding operations. Similarly, a second distance is preset between the two second hot press rollers 202 to meet the thickness requirement of the composite film 70; the surface temperature of the second heat and pressure roller 202 is selected to be between 150 ℃ and 220 ℃ for sufficiently improving the heat and pressure composite effect.

In some embodiments of the present application, referring to fig. 2, floating rollers 205 are disposed on sides of the two second hot press rollers 202 away from each other, so as to ensure that a second distance between the two second hot press rollers 202 is kept stable, thereby fully improving the compounding and subsequent winding effects.

In some embodiments of the present application, referring to fig. 3, the third station 30 has a second unwinding roller 300, two third unwinding rollers 301, a set of second guiding rollers 302, two sets of third guiding rollers 303, and two third hot pressing rollers 304, wherein the second unwinding roller 300 is used for sending out the foil 80; two third unwinding rollers 301 are distributed on both sides of the second unwinding roller 300 for unwinding the composite film 70; the two third hot-pressing rollers 304 are used for hot-pressing and compounding the foil 80 and the composite film 70 positioned on the two sides of the foil 80; the second guide rollers 302 are distributed along the feeding direction of the foil 80 to improve the discharging efficiency of the foil 80; the two sets of third guide rollers 303 are distributed corresponding to the two third unwinding rollers 301, so that the unwinding efficiency of the composite film 70 is improved.

It will be appreciated that a third gap is also provided between the two third heated and pressed rolls 304 to meet the composite thickness requirements of the pole piece 90.

In some embodiments of the present application, the heating range of the third hot press roller 304 is selected to be between 80 ℃ and 200 ℃ to sufficiently improve the hot press composite effect.

In some embodiments of the present application, referring to fig. 3, the fourth station 40 is disposed near the output end of the third station 30, and the fourth station 40 has two sets of fourth guiding rollers 401, two second wind-up rollers 402, one set of fifth guiding rollers 403, and one third wind-up roller 404, wherein the pole piece 90 after peeling off the carrier film 60 sequentially bypasses the fifth guiding rollers 403 and is collected into the third wind-up roller 404, and the two sets of fourth guiding rollers 401 are distributed corresponding to the two second wind-up rollers 402, so that the peeled-off carrier film 60 bypasses the fourth guiding rollers 401 and is collected into the second wind-up roller 402.

It is understood that the two sets of fourth guiding rollers 401 may be selectively distributed on two sides of the pole piece 90, so as to provide a certain peeling angle between the carrier film 60 and the pole piece 90, thereby substantially improving the peeling efficiency.

In some embodiments of the present application, referring to fig. 3, the fourth station 40 has two sets of peeling guides 400, and the fixing positions of the two sets of peeling guides 400 can be adjusted.

The two sets of peeling guide structures 400 according to the embodiment of the present application should be disposed at the feeding end of the entire fourth station 40, and need to have a preset cooling distance with the third hot-press roller 304, so as to ensure the composite effect of the pole piece 90 (i.e. to make the electrode film 50 and the foil 80 have good composite effect).

It can be understood that, when the fixing positions of the two sets of peeling guide structures 400 are changed, for example, the initial states of the two sets of peeling guide structures 400 are set to be vertically spaced, when the vertical distance between the two sets of peeling guide structures 400 is changed, or the two sets of peeling guide structures 400 are dislocated in the horizontal direction, the peeling included angles between the carrier films 60 on both sides of the pole piece 90 and the pole piece 90 are changed, and thus different peeling states are obtained. With this arrangement, the technician can adjust the fixing positions of the two sets of peeling guides 400 according to the actual peeling requirements.

In some embodiments of the present application, please refer to fig. 4 and fig. 5, the two sets of peeling guide structures 400 are movably and adjustably disposed on the fixing frame 4004, and the fixing frame 4004 is disposed in the fourth station 40 and close to the sending end of the third hot press roller 304, so as to rapidly peel the carrier film 60.

In some embodiments of the present application, a plurality of sixth guide rollers may be further disposed on the fixing frame 4004 for substantially improving the peeling efficiency.

In some embodiments of the present application, please refer to fig. 4 and fig. 5 together, each set of peeling guide structure 400 includes a mounting frame 4000, an adjusting hand wheel 4001, a screw 4002, and a roller seat 4003, wherein the mounting frame 4000 is horizontally movably and adjustably disposed on the mounting frame 4004, the roller seat 4003 is vertically movably and adjustably disposed on the mounting frame 4000, the roller seat 4003 has a peeling guide roller, one end of the screw 4002 is rotatably connected to the roller seat 4003, and the other end of the screw 4002 is threadedly connected to the mounting frame 4000 and connected to the adjusting hand wheel 4001.

According to the peeling guide structure 400 of the embodiment of the application, the mounting rack 4000 is used for horizontally moving and adjusting on the fixing rack 4004, so that the dislocation distribution state of two groups of peeling guide structures 400 (particularly two peeling guide rollers) in the horizontal direction is fully adjusted; and the adjusting hand wheel 4001 is rotated to control the screw 4002 to be retracted into the mounting rack 4000 or extend out of the mounting rack 4000, so that the roller seat 4003 is adjusted to move up and down in the mounting rack 4000, and the vertical distance between the two stripping guide rollers is fully adjusted.

Obviously, the peeling guide structure 400 in such a structure can fully adjust the position, and further fully adjust the peeling included angle between the carrier film 60 and the pole piece 90, so that the actual peeling requirement can be fully satisfied.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pole piece production method is characterized by comprising the following steps:

preparing an electrode film;

compounding the composite film on two opposite sides of a foil, and attaching an electrode film on the composite film to the foil to prepare a pole piece; and

peeling the carrier film on the pole piece.

2. The method for producing a pole piece according to claim 1, wherein a surface of the carrier film, which is attached to the electrode film, is coated with a release solvent.

3. A pole piece production method as claimed in claim 1 or 2, wherein the electrode film and the carrier film are hot-press-laminated.

4. A method for producing a pole piece as claimed in claim 1 or 2, wherein, before the pole piece is prepared, the opposite sides of the foil are coated with conductive adhesive and then dried for compounding the composite film.

5. The method for producing a pole piece according to claim 4, wherein the foil is hot-pressed and compounded with the composite film.

6. The production method of the pole piece according to claim 1 or 2, characterized in that the pole piece after peeling the carrier film and the peeled carrier film are respectively rolled into a cylinder.

7. A method of producing a pole piece as claimed in claim 1 or 2, wherein the electrode film is formed by multistage hot press molding.

8. A production system, comprising:

a first station for preparing an electrode film;

a second station for compounding a carrier film on one surface of the electrode film to prepare a composite film;

the third station is used for compounding the composite film on two opposite surfaces of the foil to prepare a pole piece; and

9. The production system of claim 8, wherein the fourth station has two sets of peeling guides, and the fixed positions of the two sets of peeling guides are adjustable.

10. The production system according to claim 8 or 9, wherein the second station has a coating device for coating a release solvent to a side of the carrier film that is attached to the electrode film.