CN117059750A

CN117059750A - Manufacturing equipment and method for battery pole piece

Info

Publication number: CN117059750A
Application number: CN202311078059.8A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Shanghai Pioneer Huineng Technology Co ltd
Current assignee: Shanghai Pioneer Huineng Technology Co ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2023-11-14

Abstract

The application discloses a manufacturing equipment and a method of a battery pole piece, wherein the equipment comprises the following components: a rolling device having a rolling nip; the unreeling device is arranged at the upstream of the rolling device and is used for unreeling the current collector to the rolling gap; the coating device is arranged between the unreeling device and the rolling device and is used for coating the softening liquid on the first surface of the current collector; the film providing device is arranged at the upstream of the rolling device and is used for providing dry electrode films for the rolling gap, and the dry electrode films are positioned on one side of the first surface of the current collector so as to be rolled and bonded on the first surface by the rolling device to form a composite pole piece; and the winding device is arranged at the downstream of the rolling device and is used for winding the composite pole piece. The application can avoid the phenomenon of sticking the roller and can improve the manufacturing efficiency and yield of the battery pole piece.

Description

Manufacturing equipment and method for battery pole piece

Technical Field

The application relates to the technical field of battery manufacturing, in particular to a manufacturing device and a manufacturing method of a battery pole piece.

Background

In the related art, the processing process of the lithium/sodium ion battery pole piece can be classified into a wet process and a dry process according to whether a solvent is used. In the dry process, the binder in the powder is fibrillated through a rolling procedure under the condition of no solvent, so as to prepare a powder film with certain specification and size, namely a dry electrode film, and then the dry electrode film is attached to a current collector coated with conductive adhesive in a heating and rolling mode, so that the battery pole piece can be obtained.

In the production process of the battery pole piece, the two surfaces of the current collector, which are arranged back to back, are always required to be bonded with dry electrode films through conductive adhesive, namely the two surfaces of the current collector, which are arranged back to back, are always required to be coated with the conductive adhesive. If two surfaces of the current collector are simultaneously bonded with the dry electrode membrane in a heating and rolling mode, the conductive adhesive softened by heating in the process cannot be bonded with the roller, but the weight of the unit area of the dry electrode membrane respectively bonded on the two surfaces of the current collector cannot be detected in the bonding process, and the negative and positive surfaces can be caused.

In the process of bonding the dry electrode membrane, if the conductive adhesive is coated on one surface of the current collector, the conductive adhesive is coated on the other surface of the current collector after the surface is bonded with the dry electrode membrane, and the process is complex.

Thus, in actual production processes, the current collector is typically coated with a conductive paste on both sides, and the bonding of the dry electrode films on both sides of the current collector is typically not performed simultaneously, but in separate steps. In the process that one surface of the current collector is attached to the dry electrode membrane in a heating and rolling mode, conductive adhesives on two surfaces of the current collector are softened due to heating, and adhesive force of the conductive adhesives on the two surfaces is also enhanced due to softening, so that one surface of the current collector is attached to the dry electrode membrane through the softened conductive adhesives, but the other surface of the current collector is very easy to be attached to a roller, and normal production of a battery pole piece is affected.

Disclosure of Invention

In order to overcome the defects in the related art, the application provides a manufacturing device and a manufacturing method of a battery pole piece, which are used for solving the problem that in the related art, when a dry electrode membrane is rolled and bonded on one side under the condition that conductive adhesive is coated on two sides of the back arrangement of a current collector, the roll is easy to stick.

In order to solve the above technical problem, in a first aspect, the present application provides a manufacturing apparatus of a battery pole piece, the apparatus comprising:

a rolling device having a rolling nip;

The unreeling device is arranged at the upstream of the rolling device and is used for unreeling the current collector to the rolling gap, the current collector is provided with a first surface and a second surface which are arranged oppositely, and the first surface and the second surface are coated with conductive adhesive;

the coating device is arranged between the unreeling device and the rolling device and is used for coating softening liquid on the first surface so that the conductive adhesive on the first surface has a lower softening bonding temperature than the conductive adhesive on the second surface without the softening liquid;

the film providing device is arranged at the upstream of the rolling device and is used for providing dry electrode films for the rolling gap, and the dry electrode films are positioned on one side of the first face of the current collector and are rolled and bonded on the first face by the rolling device to form a composite pole piece;

the rolling device is arranged at the downstream of the rolling device and is used for rolling the composite pole piece.

In a possible implementation manner of the first aspect, the coating device includes a spray head and a protective cover covering an outer side of the spray head, the protective cover is used for allowing the current collector to pass through, and the spray head is used for coating the softening liquid to the current collector penetrating into the protective cover.

In a possible implementation manner of the first aspect, a protection piece is disposed in the protection cover, where the protection piece is disposed between the spray head and the current collector, and the protection piece is used to prevent the spray head from applying the softening liquid to the second surface.

In a possible implementation manner of the first aspect, a support roller is rotatably mounted in the protective cover, and the support roller is used for supporting and conveying the current collector.

In a possible implementation manner of the first aspect, the coating device further includes a liquid supply member and a gas supply member, where the liquid supply member is in communication with the spray head, the liquid supply member is configured to supply the softening liquid to the spray head, and the gas supply member is configured to supply gas for atomizing and spraying the softening liquid out of the spray head.

In a possible implementation manner of the first aspect, the coating device further includes a recovery member in communication with the protective cover, the recovery member being configured to recover the liquid and/or the gas in the protective cover.

In a possible implementation manner of the first aspect, the film providing device includes a film mounting roller for mounting the rolled dry electrode film and for unreeling the rolled dry electrode film to the roll nip.

In a possible implementation manner of the first aspect, the film sheet providing device includes:

a powder container for containing powder for manufacturing the dry electrode membrane, the powder container having an outlet from which the powder flows out;

the film forming pair roller is arranged at the outlet and is used for rolling powder flowing out of the outlet to form the dry electrode film and conveying the dry electrode film to the rolling gap.

In a possible implementation manner of the first aspect, at least one of a film forming gap, a rolling temperature, a rolling line pressure and a rolling speed of the film forming pair roller is controllable.

In a possible implementation manner of the first aspect, the manufacturing apparatus of a battery pole piece further includes:

and the drying device is arranged between the rolling device and the winding device and is used for drying the softening liquid on the composite pole piece.

In a possible implementation manner of the first aspect, at least one of the roll nip, roll temperature, roll line pressure and roll speed of the roll device is controllable.

A first measuring member disposed between the unreeling device and the coating device, the first measuring member being for measuring a weight per unit area and/or a thickness per unit area of the current collector;

the second measuring piece is arranged between the rolling device and the winding device and is used for measuring the weight per unit area and/or the thickness per unit area of the composite pole piece.

and the third measuring piece is arranged between the diaphragm providing device and the rolling device and is used for measuring the weight per unit area and/or the thickness per unit area of the dry electrode diaphragm.

In a second aspect, the present application also provides a method for manufacturing a battery pole piece, the method comprising:

applying a softening liquid to a first side of an unreeled current collector so that the conductive paste on the first side has a lower softening bonding temperature than the conductive paste on a second side not coated with the softening liquid;

rolling and bonding a dry electrode membrane on the first surface to form the composite pole piece;

Winding the composite pole piece to obtain a coiled composite pole piece;

unreeling the coiled composite pole piece;

rolling and bonding the dry electrode membrane to the second surface to form a battery pole piece;

and rolling the battery pole piece.

In a possible implementation manner of the second aspect, the coating amount of the softening liquid is 0.03mg/cm ² -1mg/cm ² 。

In a possible implementation manner of the second aspect, the rolling temperature of the rolling is 50 ℃ to 130 ℃.

In a possible implementation of the second aspect, the roll line pressure of the roll is between 0.5 ton force/meter and 80 ton force/meter.

In a possible implementation manner of the second aspect, before the winding the battery pole piece, the method further includes:

baking the battery pole piece to dry the softening liquid on the battery pole piece, wherein the baking temperature is 80-160 ℃.

Compared with the prior art, the application has at least the following beneficial effects:

in the application, the conductive adhesive on the first surface has lower softening bonding temperature compared with the conductive adhesive on the second surface without the softening liquid, so compared with the related art, the application can ensure the bonding strength between the first surface and the dry electrode membrane through the conductive adhesive softened on the first surface by coating the softening liquid on the first surface, can realize the bonding of the first surface and the dry electrode membrane at lower softening bonding temperature, and simultaneously can realize the manufacturing efficiency and the yield of the battery pole piece by the lower softening bonding temperature compared with the bonding of the second surface and the dry electrode membrane in the bonding process of the first surface and the dry electrode membrane.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a manufacturing apparatus for a battery pole piece according to an embodiment of the present application;

FIG. 2 is a schematic structural view of a coating apparatus according to an embodiment of the present application;

FIG. 3 is a second schematic structural view of a coating apparatus according to an embodiment of the present application;

FIG. 4 is a second schematic diagram of a manufacturing apparatus for a battery pole piece according to an embodiment of the present application;

fig. 5 is a flowchart of a method for manufacturing a battery pole piece according to an embodiment of the present application;

fig. 6 is a comparative table of the effects of the present application and comparative examples provided in the examples of the present application.

Reference numerals illustrate:

1-a rolling device; 11-bonding press rolls;

2-unreeling device;

3-coating means; 31-a spray head; 32-protecting cover; 33-guard; 34-backing rolls; 35-a liquid supply part; 36-air supply piece; 37-recovery piece;

4-a diaphragm providing device; 41-a film mounting roller; 42-powder container; 43-film forming twin rolls;

5-a winding device;

6-current collector; 61-a first side; 62-a second side;

7-dry electrode membrane;

8-a composite pole piece;

9-powder;

10-a drying device;

20-a first measurement member;

30-a second measurement member;

40-a third measurement member;

50-tension control device.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

As described in the background of the application, in the related art, in the production process of the battery pole piece, the two surfaces of the current collector, which are arranged back to back, often need to be bonded to the dry electrode membrane by the conductive adhesive, that is, the two surfaces of the current collector, which are arranged back to back, often need to be coated with the conductive adhesive. If two surfaces of the current collector are simultaneously bonded with the dry electrode membrane in a heating and rolling mode, the conductive adhesive softened by heating in the process cannot be bonded with the roller, but the weight of the unit area of the dry electrode membrane respectively bonded on the two surfaces of the current collector cannot be detected in the bonding process, and the negative and positive surfaces can be caused.

Thus, in actual production processes, the current collector is typically coated with a conductive paste on both sides, and the bonding of the dry electrode films on both sides of the current collector is typically not performed simultaneously, but in separate steps. In the process that one surface of the current collector is attached to the dry electrode membrane in a heating and rolling mode, conductive adhesive on two surfaces of the current collector is softened due to heating, the adhesive force of the conductive adhesive is also enhanced, one surface of the current collector is attached to the dry electrode membrane through the softened conductive adhesive, but the adhesive force of the conductive adhesive on the other surface of the current collector is enhanced, so that the current collector is easily attached to a roller, and normal production of a battery pole piece is affected.

Example 1

In view of the above-mentioned problems, the present application provides a manufacturing apparatus for a battery electrode sheet, to solve the problem that in the related art, when a dry electrode film is roll-bonded on one side under the condition that both sides of a current collector body back arrangement are coated with conductive adhesive, sticking of the roll easily occurs.

The technical scheme of the application is further described below with reference to specific embodiments and attached drawings:

as shown in fig. 1, the manufacturing apparatus of the battery pole piece includes a rolling device 1, an unreeling device 2, a coating device 3, a film providing device 4, and a reeling device 5. Wherein the rolling device 1 has a rolling nip, the unreeling device 2 is arranged upstream of the rolling device 1, the unreeling device 2 is used for unreeling the current collector 6 to the rolling nip, the current collector 6 has a first face 61 and a second face 62 which are arranged opposite to each other, and the first face 61 and the second face 62 are both coated with conductive glue.

The coating device 3 is disposed between the unreeling device 2 and the rolling device 1, and the coating device 3 is used for coating the softening liquid on the first surface 61, so that the conductive adhesive on the first surface 61 has a lower softening bonding temperature than the conductive adhesive on the second surface 62 without the softening liquid. The film providing device 4 is disposed upstream of the rolling device 1, and is used for providing the dry electrode film 7 to the rolling gap, wherein the dry electrode film 7 is located on the side of the first surface 61 of the current collector 6, so that the rolling device 1 can roll and bond the dry electrode film 7 to the first surface 61 to form the composite pole piece 8.

The winding device 5 is arranged at the downstream of the rolling device 1, and the winding device 5 is used for winding the composite pole piece 8.

In the process of using the manufacturing equipment of the battery pole piece, firstly, the current collector 6 can be unreeled to a rolling gap of the rolling device 1 through the unreeled device 2 at the upstream of the rolling device 1, then, the softening liquid is coated on the first surface 61 of the unreeled current collector 6 through the coating device 3 between the unreeled device 2 and the rolling device 1, so that the softening liquid softens and enhances the adhesive force of the conductive adhesive on the first surface 61, and meanwhile, the conductive adhesive on the first surface 61 has a lower softening adhesive temperature than the conductive adhesive on the second surface 62 without the softening liquid.

Since the dry electrode film 7 provided by the film providing device 4 at the upstream of the rolling device 1 to the rolling gap is located at the side where the first surface 61 of the current collector 6 is located, during the process that the current collector 6 with the first surface 61 coated with the softening liquid passes through the rolling gap, the dry electrode film 7 can be roll-bonded to the first surface 61 by the rolling device 1 to form the composite pole piece 8, and finally, the composite pole piece 8 is rolled by the rolling device 5 at the downstream of the rolling device 1 to obtain the rolled composite pole piece 8. The rolled composite pole piece 8 can be manufactured into a rolled battery pole piece by roll bonding the dry electrode film 7 on the second face 62.

Because the conductive adhesive on the first surface 61 has a lower softening bonding temperature than the conductive adhesive on the second surface 62 without the softening liquid by coating the softening liquid on the first surface 61, compared with the related art, the application can ensure the bonding strength between the first surface 61 and the dry electrode membrane 7 by coating the softening liquid on the first surface 61 and the conductive adhesive on the second surface 62 without the softening liquid, can realize the bonding between the first surface 61 and the dry electrode membrane 7 at a lower softening bonding temperature, and can ensure the normal production of the battery pole piece and improve the manufacturing efficiency and the yield of the battery pole piece because the process has a lower softening bonding temperature than the bonding between the second surface 62 and the dry electrode membrane 7 in the process by coating the softening liquid on the first surface 61.

As for the roll nip of the roll apparatus 1, as shown in fig. 1, in the present embodiment, the roll apparatus 1 includes a pair of bonding rolls 11, and the nip between the two bonding rolls 11 constitutes the roll nip. The pair of bonding rolls 11 not only can realize roll bonding of the current collector 6 and the dry electrode film 7, but also can simplify the structural composition of the roll device 1.

In other embodiments, the rolling device 1 may also comprise two, three or more pairs of bonding rolls 11, and correspondingly, the rolling nip of the rolling device 1 may also be formed by the joint between two bonding rolls 11 of each pair. By forming the rolling device 1 by two or more pairs of bonding rolls 11, the rolling range of the rolling device 1 can be increased, and the time for which the current collector 6 and the dry electrode sheet 7 are rolled can be further increased, and the effect of rolling bonding can be further enhanced.

As the softening liquid, the softening liquid may be at least one of a liquid having a viscosity of less than 300 mPa.s and a boiling point of less than 150 ℃, such as water, DMF liquid, halogenated hydrocarbon solvent having a carbon number of 1 to 3, alkane, alkene, cycloalkane and aromatic hydrocarbon compound having a carbon number of 5 to 10, pyrrolidone compound having a carbon number of 5 to 8, amide compound having a carbon number of 3 to 6, carboxylic acid ester having a carbon number of 3 to 6, carbonic acid ester having a carbon number of 3 to 6, ketone compound having a carbon number of 3 to 6, alcohol compound having a carbon number of 1 to 5, ether compound having a carbon number of 4 to 8. Specifically, the softening liquid is matched with the corresponding conductive adhesive to ensure that the softening liquid can soften and strengthen the adhesive force of the conductive adhesive.

Through the softening liquid with the viscosity lower than 300 mPa.s and the boiling point lower than 150 ℃, the tackifying effect of the softening liquid on the conductive adhesive can be ensured, and meanwhile, when the softening liquid on the current collector 6 needs to be dried in the later period, the drying is convenient, and the softening of the conductive adhesive on the second surface 62 can be avoided during the drying, so that the adhesion of the second surface 62 to other objects is avoided.

Through the above-mentioned more types of softening liquid, can make different conductive adhesive can both find assorted softening liquid to a certain extent, have made things convenient for the matching of softening liquid and corresponding conductive adhesive promptly.

In other embodiments, the softening liquid may also be a liquid with a viscosity higher than 300mpa·s or a boiling point higher than 150 ℃ depending on the conductive adhesive. The thickening effect of the softening liquid on the conductive adhesive can be further enhanced by the softening liquid with the viscosity higher than 300 mPa.s, and the softening liquid with the boiling point higher than 150 ℃ can not be easily evaporated, so that the thickening effect of the softening liquid on the conductive adhesive can be ensured.

As shown in fig. 1 and 2, there are various implementations of the coating device 3, and in a first possible implementation, the coating device 3 includes a spray head 31 and a protective cover 32 covering the outer side of the spray head 31, the protective cover 32 is provided for the current collector 6 to pass through, and the spray head 31 is used for applying the softening liquid to the current collector 6 penetrating through the protective cover 32.

By providing the shower head 31, since the shower head 31 can uniformly coat the softening liquid on the current collector 6 by spraying, the adhesion force of the conductive adhesive on the current collector 6 can be uniformly enhanced, and the adhesion effect of the current collector 6 and the dry electrode film 7 can be further enhanced. Through setting up protection casing 32, can prevent that shower nozzle 31 spun soft liquid from dispersing to other positions beyond protection casing 32, avoid the influence of the soft liquid of dispersion to other positions beyond protection casing 32, also can avoid the soft liquid to disperse the polluted environment in the environment simultaneously.

For the spray head 31, the spray head 31 may be one or more venturi spray heads, ultrasonic atomizing spray heads, or ejector pin solenoid spray heads. The number selection and the type selection of the spray heads 31 are enriched, and the convenience is brought to the number setting and the specific type selection of the spray heads 31.

For the coating device 3, in a second possible implementation, the coating device 3 does not comprise a protective cover 32, in which case the spray head 31 is exposed to the environment. By the arrangement, the structural composition of the coating device 3 can be simplified, and the coating device 3 is convenient to process and manufacture.

In a third possible implementation, the coating device 3 may also comprise a roller brush, in which case the application of the softening liquid to the current collector 6 is carried out by means of a roller brush. Through rolling and brushing the softening liquid, the dispersion of the softening liquid to other positions can be avoided to a certain extent, and then the influence of the softening liquid to other positions can be avoided to a certain extent.

When the coating device 3 is realized in the first possible way, further, as shown in fig. 2, a shielding member 33 is provided in the protective cover 32, the shielding member 33 being provided between the spray head 31 and the current collector 6, the shielding member 33 being used for preventing the spray head 31 from applying the softening liquid to the second surface 62.

In the process of applying the softening liquid to the first surface 61 by the applying device 3, the first surface 61 is disposed toward the spray head 31, and the second surface 62 disposed opposite to the first surface 61 is disposed opposite to the spray head 31, and at this time, the spray head 31 is prevented from applying the softening liquid to the second surface 62 by the guard 33, so that the softening liquid can be prevented from enhancing the adhesion force of the conductive adhesive on the second surface 62, and further, the adhesion between the second surface 62 and the bonding press roller 11 can be further avoided.

For the guard 33, in this embodiment, the guard 33 is a protection plate, and the shape and structure of the guard 33 can be simplified to a certain extent by the protection plate, which is beneficial to facilitate the processing and manufacturing of the guard 33.

In another embodiment, the protecting member 33 may be a protecting tube, and the protecting effect of the protecting member 33 can be enhanced by the protecting tube.

In other embodiments, the guard 33 may not be provided, in which case the application of the softening liquid to the second face 62 facing away from the spray head 31 may be avoided by controlling the spray range of the spray head 31. By the arrangement, the structure arrangement in the protective cover 32 can be simplified, and the protective cover 32 is convenient to process and manufacture.

Further, as shown in fig. 1 and 2, a support roller 34 is rotatably installed in the hood 32, and the support roller 34 serves to support and convey the current collector 6.

Through backing roll 34, not only can realize the transport of mass flow body 6 in protection casing 32, but also through the support of backing roll 34 to mass flow body 6, can make the mass flow body 6 that carries in the protection casing 32 more stable, and then can make the softener that coats on mass flow body 6 more even.

In other embodiments, the support roller 34 may not be rotatably mounted in the shield 32, in which case the current collector 6 penetrating into the shield 32 is suspended. The support roller 34 is not installed, so that not only the weight of the coating device 3 can be reduced, but also the structural composition of the coating device 3 can be simplified, which is beneficial to reducing the manufacturing cost of the coating device 3.

Further, as shown in fig. 2, the coating apparatus 3 further includes a liquid supply member 35 and a gas supply member 36 in communication with the spray head 31, the liquid supply member 35 being configured to supply the softening liquid to the spray head 31, and the gas supply member 36 being configured to supply a gas for atomizing the softening liquid to be sprayed out of the spray head 31.

Through the liquid supply member 35, not only is the storage of the softened liquid facilitated, but also the continuous outward spraying of the softened liquid from the spray head 31 is ensured, and the normal coating of the coating device 3 is ensured. The gas is supplied through the gas supply member 36 to atomize the softening liquid, so that the softening liquid can be uniformly coated on the current collector 6, the adhesive force of the conductive adhesive on the current collector 6 can be more uniformly enhanced, and the adhesive effect of the current collector 6 and the dry electrode membrane 7 can be further enhanced.

In this embodiment, the liquid supply member 35 may include a liquid supply tank or a liquid supply tank, and the gas supply member 36 may include a gas supply tank or a gas supply tank. By the arrangement, the structure composition of the liquid supply piece 35 and the air supply piece 36 can be correspondingly simplified, and the manufacture of the liquid supply piece 35 and the air supply piece 36 is facilitated.

As for the liquid supply member 35, in the present embodiment, the liquid supply member 35 has a temperature control function, that is, the liquid supply member 35 can supply the softening liquid with different temperatures to the spray head 31. According to the different requirements of conductive adhesive on the current collector 6 or different requirements of rolling bonding, the liquid supply piece 35 with the temperature control function can provide the softening liquid with different temperatures for the spray head 31, so that the softening liquid is guaranteed to have better tackifying effect on the conductive adhesive, and meanwhile, the current collector 6 and the dry electrode membrane 7 are guaranteed to have better bonding effect.

In other embodiments, the liquid supply member 35 can only supply the same temperature of the softening liquid to the spray head 31, i.e., the liquid supply member 35 does not have a temperature control function. Since the liquid supply member 35 having no temperature control function to some extent is relatively low in price, the cost can be reduced.

In other embodiments, the coating apparatus 3 may not include the liquid supply member 35, and in such a case, when the coating apparatus 3 is used, a temporary liquid supply container other than the coating apparatus 3 may be used to supply the softening liquid to the shower head 31. Since the liquid supply member 35 is not provided, the structural composition of the coating device 3 can be simplified, and the convenience in processing and manufacturing of the coating device 3 can be facilitated.

In other embodiments, the coating device 3 may not include the air supply 36, in which case the softening liquid is sprayed in the form of droplets onto the current collector 6 through the spray head 31 when the coating device 3 is in use. Since the air supply member 36 is not provided, the structural composition of the coating device 3 can be simplified, and the convenience in processing and manufacturing of the coating device 3 can be facilitated.

Further, as shown in fig. 2, the coating apparatus 3 further includes a recovery member 37 in communication with the hood 32, the recovery member 37 being for recovering the liquid and/or gas in the hood 32.

The softening liquid which is not sprayed onto the current collector 6, the liquid drops of the softening liquid or the steam volatilized by the softening liquid in the protective cover 32 can be recovered through the recovery piece 37, so that the recycling of the softening liquid can be realized, the cost can be reduced, the concentration of the softening liquid in the protective cover 32 can be reduced, the softening liquid in the protective cover 32 can be prevented from falling onto other surfaces of the current collector 6, the adhesion of other surfaces with the bonding press roller 11 can be avoided, and the normal rolling of the rolling device 1 is ensured.

In this embodiment, the recovery member 37 may comprise a recovery tank or recovery tank in communication with the hood 32. By the arrangement, the structural composition of the recovery piece 37 can be correspondingly simplified, and the recovery piece 37 is convenient to manufacture.

In other embodiments, as shown in fig. 3, the coating apparatus 3 may not include the recovery member 37, in which case, to avoid too high a concentration of the softening liquid in the protecting cover 32, the protecting cover 32 may be periodically opened to drain the softening liquid in the protecting cover 32. The recovery member 37 is not provided, so that the structural composition of the coating device 3 can be simplified, and the manufacturing cost of the coating device 3 can be reduced.

Further, the amount of the softening liquid applied to the first surface 61 by the coating device 3 was 0.03mg/cm ² -1mg/cm ² 。

By the amount of the softening liquid in this range, the current collector 6 can be ensured to have a proper amount of the softening liquid, and the effect of enhancing the conductive adhesive strength can be improved, and the effect of bonding the current collector 6 and the dry electrode film 7 can be improved.

In other embodiments, the amount of the softening liquid applied to the first face 61 by the coating device 3 may also be less than 0.03mg/cm ² Or greater than 1mg/cm ² . When the softening liquid amount is less than 0.03mg/cm ² In this case, the amount of the softening liquid can be reduced, which is advantageous for reducing the use cost of the softening liquid. When the softening liquid amount is more than 1mg/cm ² In this case, the adhesion force of the conductive paste can be further enhanced, and the adhesion effect between the current collector 6 and the dry electrode film 7 can be further enhanced.

As shown in fig. 1, the film supply device 4 includes a film mounting roller 41, and the film mounting roller 41 is used for mounting the rolled dry electrode film sheet 7 and for unreeling the rolled dry electrode film sheet 7 to a roll nip of the roll press device 1.

The film mounting roller 41 is used for directly unreeling, so that the unreeling efficiency of the film providing device 4 for unreeling the dry electrode film 7 to the rolling gap of the rolling device 1 is improved, and the bonding efficiency of the dry electrode film 7 and the current collector 6 is improved.

In another embodiment, as shown in fig. 4, the film sheet supply apparatus 4 includes a powder container 42 and a film forming counter roller 43. Wherein the powder container 42 is used for containing the powder 9 for manufacturing the dry electrode film 7, and the powder container 42 is provided with an outlet for the powder 9 to flow out. A film forming counter roller 43 is provided at the outlet of the powder container 42, and the film forming counter roller 43 is used for rolling the powder 9 flowing out of the outlet to form the dry electrode sheet 7, and conveying the dry electrode sheet 7 to the rolling nip of the rolling device 1.

The dry electrode membrane 7 is manufactured by directly rolling the powder 9 by the membrane providing device 4, so that the membrane providing device 4 can continuously provide the dry electrode membrane 7 under the condition that the powder 9 in the powder container 42 is sufficient, and the dry electrode membrane 7 is reloaded to the membrane providing device 4 without stopping the manufacturing equipment of the battery pole piece, thereby being beneficial to improving the manufacturing efficiency of the battery pole piece.

Further, as shown in fig. 4, at least one of the film forming gap, the rolling temperature, the rolling line pressure, and the rolling speed of the film forming counter roller 43 is controllable.

The film forming twin roller 43 can manufacture dry electrode films 7 with different specifications according to the needs, and the film forming gap, the rolling temperature, the rolling line pressure or the rolling speed can be adjusted and controlled according to the needs, so that the manufacturing of the dry electrode films 7 with different specifications is facilitated.

As shown in fig. 4, the film forming gap is constituted by a radial gap between two rollers of the pair of film forming paired rollers 43. The pair of film forming rollers 43 not only can roll the powder 9, but also can simplify the structural composition of the film sheet supply device 4.

In other embodiments, the film forming pair rollers 43 may be provided in plural pairs, and the film forming slit may be formed by a joint between two rollers of each pair of the film forming pair rollers 43. By the plurality of pairs of film forming paired rollers 43, the rolling range of the dry electrode film sheet 7 manufactured by the film forming paired rollers 43 can be increased, which is advantageous in improving the manufacturing quality of the dry electrode film sheet 7.

In other embodiments, the film forming gap, the rolling temperature, the rolling line pressure and the rolling speed of the film forming pair roller 43 are not controllable, i.e. the film forming gap, the rolling temperature, the rolling line pressure and the rolling speed of the film forming pair roller 43 are all fixed and cannot be adjusted and controlled as required. Since the cost of the film forming counter roller 43 is relatively low, the manufacturing cost of the film sheet supply apparatus 4 can be reduced.

As shown in fig. 1, the manufacturing apparatus of the battery pole piece further comprises a drying device 10, the drying device 10 is disposed between the rolling device 1 and the winding device 5, and the drying device 10 is used for drying the softening liquid on the composite pole piece 8.

The softening liquid on the composite pole piece 8 is dried through the drying device 10, so that the problem that the coiled composite pole piece 8 cannot be unreeled due to adhesion can be avoided by softening and enhancing the adhesion force of the conductive adhesive on the second surface 62 after the composite pole piece 8 is coiled.

In other embodiments, the drying device 10 may not be provided, in which case, in order to prevent the softened liquid from flowing onto the second surface 62 after the composite pole piece 8 is coiled, the coating amount of the softened liquid may be properly controlled, or the coiled material may be coiled after the softened liquid on the composite pole piece 8 is air-dried. Since the drying device 10 is not provided, the structural composition of the manufacturing equipment of the battery pole piece can be simplified, and the manufacturing cost of the manufacturing equipment of the battery pole piece can be reduced.

Further, the baking temperature of the baking device 10 is 80-160 ℃.

The baking temperature is set within 80-160 ℃, so that the softening liquid on the dried composite pole piece 8 can be ensured, and meanwhile, the conductive adhesive on the second surface 62 can be prevented from softening and tackifying due to baking.

In other embodiments, the baking temperature of the drying device 10 may be lower than 80 ℃ or higher than 160 ℃ according to the conductive adhesive. When the baking temperature is lower than 80 ℃, the use power of the drying device 10 can be reduced, and the energy saving is facilitated. When the baking temperature is higher than 160 ℃, the drying efficiency of the softening liquid on the composite pole piece 8 can be accelerated, and the manufacturing efficiency of the battery pole piece can be accelerated.

For the rolling device 1, at least one of the rolling nip, the rolling temperature, the rolling line pressure, and the rolling speed of the rolling device 1 is controllable.

Through this roll-in device 1, can make the battery pole piece of different specifications as required, adjust control roll-in gap, roll-in temperature, roll-in line pressure or roll-in speed as required, be favorable to making of the battery pole piece of different specifications.

In other embodiments, the roll gap, the roll temperature, the roll line pressure and the roll speed of the roll device 1 are not controllable, i.e. the roll gap, the roll temperature, the roll line pressure and the roll speed of the roll device 1 are all fixed and cannot be adjusted and controlled as required. Since the price cost of the rolling device 1 is relatively low, the manufacturing cost of the rolling device 1 can be reduced.

Further, the rolling temperature of the rolling device 1 is 50 ℃ to 130 ℃.

The rolling temperature is set within the range of 50-130 ℃, so that the rolling temperature is lower than the softening bonding temperature of the conductive adhesive by 5-30 ℃, and the dry electrode film 7 can be firmly rolled and bonded on the first surface 61 by heating of the rolling device 1, and meanwhile, the conductive adhesive on the second surface 62 is not softened and bonding force is not enhanced due to heating.

In other embodiments, the rolling temperature of the rolling device 1 may be lower than 50 ℃ or higher than 130 ℃ depending on the conductive adhesive. When the rolling temperature is lower than 50 ℃, the use power of the rolling device 1 can be reduced, and the energy saving is facilitated. When the rolling temperature is higher than 130 ℃, the bonding force between the dry electrode membrane 7 and the current collector 6 can be enhanced by heating the rolling device 1, and the bonding effect between the dry electrode membrane 7 and the current collector 6 can be enhanced.

Further, the roll line pressure of the roll press apparatus 1 is 0.5 ton force/m to 80 ton force/m.

The dry electrode sheet 7 can be firmly roll-bonded to the current collector 6 by the roll line pressure of the roll device 1 set within 0.5 ton force/m to 80 ton force/m, and the roll effect of the roll device 1 can be ensured.

In other embodiments, the roll line pressure of the roll device 1 may also be lower than 0.5 ton force/meter or higher than 80 ton force/meter. When the tonnage force per meter is lower than 0.5 ton force, the use power of the rolling device 1 can be reduced, thereby contributing to energy saving. When the pressure is higher than 80 tons/m, the dry electrode film 7 can be firmly adhered to the current collector 6 by the rolling of the rolling device 1, and the adhesion effect of the dry electrode film 7 to the current collector 6 can be enhanced.

As shown in fig. 1, the apparatus for manufacturing a battery pole piece further includes a first measuring member 20 and a second measuring member 30, the first measuring member 20 being disposed between the unreeling device 2 and the coating device 3, the first measuring member 20 being used for measuring the weight per unit area and/or the thickness per unit area of the current collector 6. The second measuring element 30 is arranged between the rolling device 1 and the winding device 5, and the second measuring element 30 is used for measuring the weight per unit area and/or the thickness per unit area of the composite pole piece 8.

The weight per unit area and/or the thickness per unit area of the current collector 6 are measured by the first measuring member 20, and the weight per unit area and/or the thickness per unit area of the composite pole piece 8 are measured by the second measuring member 30, so that the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the composite pole piece 8 are controlled, and further the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the battery pole piece are controlled, and the stability and consistency of the battery are influenced by the weight and the thickness of the battery pole piece, so that the stability and consistency of the battery are guaranteed by controlling the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the battery pole piece.

In this embodiment, when the thickness measuring device is used for measuring the thickness, the first measuring member 20 and the second measuring member 30 can be X-ray or β -ray weight measuring devices, and when the thickness measuring device is used for measuring the thickness, the first measuring member 20 and the second measuring member 30 can be laser thickness measuring devices or ultrasonic thickness measuring devices. Therefore, the first measuring member 20 and the second measuring member 30 can conveniently measure the weight per unit area and/or the thickness per unit area, and the first measuring member 20 and the second measuring member 30 can be flexibly selected, so that the specific selection of the first measuring member 20 and the second measuring member 30 is facilitated.

In other embodiments, the first measuring element 20 may be omitted, and the second measuring element 30 may be provided, that is, the second measuring element 30 measures the weight per unit area and/or the thickness per unit area of the composite pole piece 8, so as to control the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the composite pole piece 8, and further control the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the battery pole piece. By the arrangement, the structural composition of the manufacturing equipment of the battery pole piece can be simplified, and the manufacturing cost of the manufacturing equipment of the battery pole piece is reduced.

In other embodiments, the first measuring member 20 and the second measuring member 30 may not be provided, in which case, to ensure the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the battery pole piece, the current collector 6 and the dry electrode film 7 meeting the corresponding accuracy requirements may be selected, and the coating accuracy and the rolling accuracy may also need to be controlled. Since the first measuring member 20 and the second measuring member 30 are not provided, the structural composition of the manufacturing apparatus of the battery pole piece can be further simplified, which is advantageous to further reduce the manufacturing cost of the manufacturing apparatus of the battery pole piece.

Further, as shown in fig. 1, the apparatus for manufacturing a battery pole piece further includes a third measuring member 40, and the third measuring member 40 is used for measuring the weight per unit area and/or the thickness per unit area of the dry electrode membrane 7.

The weight per unit area and/or the thickness per unit area of the dry electrode membrane 7 are measured by the third measuring member 40, which is beneficial to realizing the control of the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the electrode membrane 7, and further beneficial to further realizing the control of the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the composite pole piece 8 and the battery pole piece.

In this embodiment, the third measuring element 40 may be an X-ray or β -ray weight measuring device when used for weight measurement, and the third measuring element 40 may be a laser thickness measuring device or an ultrasonic thickness measuring device when used for thickness measurement. Therefore, the third measuring element 40 can conveniently measure the weight per unit area and/or the thickness per unit area, the selection of the third measuring element 40 is flexible, and the specific selection of the third measuring element 40 is facilitated.

In other embodiments, as shown in fig. 4, the third measuring member 40 may not be provided, in which case, in order to ensure the accuracy of the weight per unit area and/or the accuracy of the thickness per unit area of the dry electrode film 7, the dry electrode film 7 may be selected to meet the corresponding accuracy requirement. Since the third measuring member 40 is not provided, the structural composition of the manufacturing apparatus of the battery pole piece can be further simplified, which is advantageous to further reduce the manufacturing cost of the manufacturing apparatus of the battery pole piece.

After the composite pole piece 8 is manufactured and rolled, in the process of adhering the dry electrode membrane 7 on the second surface 62 in the composite pole piece 8 to manufacture the battery pole piece by using the composite pole piece 8, the composite pole piece 8 rolled by the rolling device 5 can be transferred to the unreeling device 2, so that the unreeling device 2 can be used for unreeling the composite pole piece 8 to a rolling gap of the rolling device 1.

As shown in fig. 1, the manufacturing apparatus of the battery pole piece further includes tension control devices 50, the tension control devices 50 are provided with three, the three tension control devices 50 are respectively disposed between the unreeling device 2 and the coating device 3, between the film providing device 4 and the rolling device 1, and between the drying device 10 and the reeling device 5, the tension control devices 50 are used for controlling the tensioning degree of the current collector 6 or the composite pole piece 8 so as to ensure the coating uniformity of the coating device 3 and the normal rolling of the rolling device 1, and meanwhile, the normal conveying of the current collector 6 or the composite pole piece 8 can be ensured.

In this process, the film providing device 4 may further provide the dry electrode film 7 to the roll nip on the side where the second surface 62 of the current collector 6 is located, so that the dry electrode film 7 may also be roll-bonded to the second surface 62 by the roll device 1 to form a battery pole piece, and the drying device 10 may also be used to dry the softening liquid on the battery pole piece. Finally, the winding device 5 may also be used for winding the formed battery pole piece to obtain a rolled battery pole piece.

In addition, in this process, the first measuring member 20 may also be used to measure the weight per unit area and/or the thickness per unit area of the composite pole piece 8, the second measuring member 30 may also be used to measure the weight per unit area and/or the thickness per unit area of the battery pole piece, and the tension control device 50 may also be used to control the degree of tension of the battery pole piece.

The battery pole piece is manufactured by the composite pole piece 8 through the manufacturing equipment of the battery pole piece, so that the manufacturing of the battery pole piece is convenient, and the yield and the manufacturing efficiency of the battery pole piece are improved.

Example two

The application also provides a manufacturing method of the battery pole piece, which can be implemented based on the manufacturing equipment of any battery pole piece in the above embodiments, and can also be implemented based on other equipment different from the manufacturing equipment of the battery pole piece, and is not limited herein.

Fig. 5 is a flowchart of a method for manufacturing a battery pole piece according to an embodiment of the present application, referring to fig. 5, the method includes:

step 501: the first side 61 of the unwound current collector 6 is coated with a softening liquid such that the conductive paste on the first side 61 has a lower softening bonding temperature than the conductive paste on the second side 62, which is not coated with the softening liquid.

Step 502: the dry electrode film 7 is roll bonded to the first face 61 to form the composite pole piece 8.

Step 503: and rolling the composite pole piece 8 to obtain a rolled composite pole piece 8.

Step 504: unreeling the reeled composite pole piece 8.

Step 505: the dry electrode film 7 is roll bonded to the second face 62 to form a battery pole piece.

Step 506: and rolling the battery pole piece.

In the manufacturing method of the battery pole piece, the conductive adhesive on the first surface 61 has a lower softening bonding temperature than the conductive adhesive on the second surface 62 without the softening liquid by coating the softening liquid on the first surface 61, so compared with the related art, the bonding strength between the first surface 61 and the dry electrode membrane 7 can be ensured by coating the softening liquid on the first surface 61 through the softened conductive adhesive on the first surface 61, the bonding of the first surface 61 and the dry electrode membrane 7 can be realized at a lower softening bonding temperature, and meanwhile, in the bonding process of the first surface 61 and the dry electrode membrane 7, the conductive adhesive on the second surface 62 without the softening liquid cannot be softened in the process, the conductive adhesive on the second surface 62 cannot be subjected to a roll bonding phenomenon, and the normal production of the battery pole piece is facilitated, and the manufacturing efficiency and the yield of the battery pole piece are improved.

Further, the methodThe coating amount of the softening liquid was 0.03mg/cm ² -1mg/cm ² 。

In other embodiments, the softening solution may also be applied in an amount of less than 0.03mg/cm ² Or greater than 1mg/cm ² . When the coating amount is less than 0.03mg/cm ² In this case, the amount of the softening liquid can be reduced, which is advantageous for reducing the use cost of the softening liquid. When the coating amount is more than 1mg/cm ² In this case, the adhesion force of the conductive paste can be further enhanced, and the adhesion effect between the current collector 6 and the dry electrode film 7 can be further enhanced.

Further, the rolling temperature of the rolling is 50-130 ℃.

The rolling temperature is set within the range of 50-130 ℃, so that the rolling temperature is lower than the softening bonding temperature of the conductive adhesive by 5-30 ℃, and the dry electrode film 7 can be firmly rolled and bonded on the first surface 61 by heating in the rolling process, and meanwhile, the conductive adhesive on the second surface 62 is not softened and bonding force is enhanced due to heating.

In other embodiments, the rolling temperature may be lower than 50 ℃ or higher than 130 ℃ depending on the conductive adhesive. When the rolling temperature is lower than 50 ℃, the power of the rolling process can be reduced, and energy conservation is facilitated. When the rolling temperature is higher than 130 ℃, the bonding force between the dry electrode membrane 7 and the current collector 6 can be enhanced by rolling and heating, and the bonding effect between the dry electrode membrane 7 and the current collector 6 can be enhanced.

Further, the roll line pressure of the roll is 0.5 ton force/m to 80 ton force/m.

The dry electrode sheet 7 can be firmly roll-bonded to the current collector 6 by the roll line pressure set within 0.5 ton force/m to 80 ton force/m, and the roll effect can be ensured.

In other embodiments, the roll line pressure may also be below 0.5 ton force/meter or above 80 ton force/meter. When the rolling force is lower than 0.5 ton force/meter, the power of the rolling process can be reduced, and energy conservation is facilitated. When the pressure is higher than 80 tons/m, the dry electrode film 7 can be firmly adhered to the current collector 6 by the pressing, and the adhesion effect of the dry electrode film 7 to the current collector 6 can be enhanced.

Further, step 506: before rolling the battery pole piece, the method further comprises the following steps:

Therefore, the problem that the coiled battery pole piece cannot be unreeled due to adhesion can be avoided because the conductive adhesive is continuously softened and adhered due to excessive softening liquid. The baking temperature is set within 80-160 ℃, so that the softening liquid on the battery pole piece can be ensured to be dried, and meanwhile, the conductive adhesive on the second surface 62 can be prevented from being softened and thickened due to baking.

In other embodiments, the baking temperature may be lower than 80 ℃ or higher than 160 ℃ depending on the conductive adhesive. When the baking temperature is lower than 80 ℃, the baking power can be reduced, and the energy saving is facilitated. When the baking temperature is higher than 160 ℃, the drying efficiency of the softening liquid on the battery pole piece can be accelerated, and the manufacturing efficiency of the battery pole piece can be accelerated.

In other embodiments, the battery pole piece may not be baked, in which case the application amount of the softening liquid may be properly controlled to avoid sticking of the rolled battery pole piece. Since the baking process is omitted, the number of manufacturing processes can be reduced, which is advantageous in improving the manufacturing efficiency.

The battery pole piece manufactured by the manufacturing method of the battery pole piece in the present application will be described in comparison with the battery pole pieces manufactured in comparative examples 1 and 2, specifically:

the application comprises the following steps: the conductive adhesive coated on the first surface 61 and the second surface 62 uses a coating of polyacrylic adhesive and conductive carbon black, the softening temperature of the conductive adhesive is 140-160 ℃, and the dry electrode membrane 7 is a dry electrode membrane 7 with active substances of graphite, adhesive of PTFE and thickness of 130 mu m. Unreeling the current collector 6 and applying DMF liquid as a softening liquid to the first face 61 The coating amount was 0.5mg/cm ² The dry electrode film sheet 7 was then roll bonded to the first face 61 to form a composite electrode sheet 8 at a roll temperature of 80 c and a roll line pressure of 3 tons/m. The second surface 62 is rolled and bonded with the dry electrode film 7, and then the softening liquid is dried by hot air at 100 ℃. And testing the stripping force of the battery pole piece by using a 180-degree stripping method, continuously manufacturing the battery pole piece with the length of 1000m, and counting the appearance yield of the battery pole piece.

Comparative example 1: the material used in the present application was not coated with DMF liquid, the roll temperature was 80℃and the roll line pressure was 3 tons/m.

Comparative example 2: the material used in the present application was not coated with DMF liquid, the roll temperature was 160℃and the roll line pressure was 3 tons/m.

As can be seen from fig. 6, the present application can achieve higher adhesion at 80 ℃, whereas the adhesion of comparative example 1 is poor, and the DMF liquid can significantly improve adhesion. When DMF liquid is not coated, the rolling temperature is raised to 160 ℃, and the adhesive force is similar to that of the application as in comparative example 2, but the adhesive roller is obviously conductive, and a plurality of appearance defects occur. It can be seen that the present application has significant advantages.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A manufacturing apparatus of a battery pole piece, characterized by comprising:

a rolling device (1), the rolling device (1) having a rolling nip;

an unreeling device (2), wherein the unreeling device (2) is arranged at the upstream of the rolling device (1), the unreeling device (2) is used for unreeling a current collector (6) towards the rolling gap, the current collector (6) is provided with a first surface (61) and a second surface (62) which are arranged oppositely, and the first surface (61) and the second surface (62) are coated with conductive glue;

a coating device (3), wherein the coating device (3) is arranged between the unreeling device (2) and the rolling device (1), and the coating device (3) is used for coating softening liquid on the first surface (61) so that the conductive adhesive on the first surface (61) has a lower softening bonding temperature than the conductive adhesive on the second surface (62) without the softening liquid;

a film providing device (4), wherein the film providing device (4) is arranged at the upstream of the rolling device (1) and is used for providing a dry electrode film (7) for the rolling gap, and the dry electrode film (7) is positioned at one side of the first surface (61) of the current collector (6) so as to enable the rolling device (1) to roll and bond the dry electrode film (7) on the first surface (61) to form a composite pole piece (8);

The rolling device (5), the rolling device (5) set up in the low reaches of roll-in device (1), the rolling device (5) is used for with compound pole piece (8) carries out the rolling.

2. The manufacturing equipment of the battery pole piece according to claim 1, characterized in that the coating device (3) comprises a spray head (31) and a protective cover (32) covered outside the spray head (31), wherein the protective cover (32) is used for allowing the current collector (6) to pass through, and the spray head (31) is used for coating the softening liquid to the current collector (6) penetrating into the protective cover (32).

3. The manufacturing equipment of the battery pole piece according to claim 2, characterized in that a protective member (33) is arranged in the protective cover (32), the protective member (33) is arranged between the spray head (31) and the current collector (6), and the protective member (33) is used for preventing the spray head (31) from coating the softening liquid on the second face (62).

4. The apparatus for manufacturing a battery pole piece according to claim 2, characterized in that a support roller (34) is rotatably mounted to the shield (32), the support roller (34) being for supporting and transporting the current collector (6).

5. The manufacturing apparatus of a battery pole piece according to claim 2, wherein the coating device (3) further comprises a liquid supply member (35) and a gas supply member (36) in communication with the shower head (31), the liquid supply member (35) being configured to supply the softening liquid to the shower head (31), the gas supply member (36) being configured to supply a gas for atomizing the softening liquid out of the shower head (31).

6. The manufacturing apparatus of battery pole pieces according to claim 5, characterized in that the coating device (3) further comprises a recycling member (37) in communication with the protective cover (32), the recycling member (37) being for recycling liquid and/or gas within the protective cover (32).

7. A manufacturing apparatus of a battery pole piece according to any one of claims 1-6, characterized in that the film providing means (4) comprises a film mounting roller (41), the film mounting roller (41) being adapted to mount the rolled dry electrode film (7) and to unwind the rolled dry electrode film (7) to the roll nip.

8. The manufacturing apparatus of a battery pole piece according to any one of claims 1 to 6, wherein the membrane providing means (4) comprises:

a powder container (42), the powder container (42) being used for containing powder (9) for manufacturing the dry electrode membrane (7), the powder container (42) having an outlet for the outflow of the powder (9);

a film forming counter roller (43), the film forming counter roller (43) being provided at the outlet, the film forming counter roller (43) being for rolling the powder (9) flowing out of the outlet to form the dry electrode film sheet (7) and conveying the dry electrode film sheet (7) to the rolling nip.

9. The apparatus for manufacturing a battery pole piece according to claim 8, wherein at least one of a film forming slit, a rolling temperature, a rolling line pressure, and a rolling speed of the film forming counter roller (43) is controllable.

10. The apparatus for manufacturing a battery pole piece according to any one of claims 1 to 6, characterized in that the apparatus for manufacturing a battery pole piece further comprises:

drying device (10), drying device (10) set up in between roll-in device (1) with coiling mechanism (5), drying device (10) are used for drying composite pole piece (8) on the soft liquid.

11. The manufacturing apparatus of a battery pole piece according to any one of claims 1-6, characterized in that at least one of the roll nip, roll temperature, roll line pressure and roll speed of the roll device (1) is controllable.

12. The apparatus for manufacturing a battery pole piece according to any one of claims 1 to 6, characterized in that the apparatus for manufacturing a battery pole piece further comprises:

a first measuring element (20), wherein the first measuring element (20) is arranged between the unreeling device (2) and the coating device (3), and the first measuring element (20) is used for measuring the weight per unit area and/or the thickness per unit area of the current collector (6);

The second measuring piece (30), second measuring piece (30) set up in between roll-in device (1) with coiling mechanism (5), second measuring piece (30) are used for measuring unit area weight and/or unit area thickness of compound pole piece (8).

13. The apparatus for manufacturing a battery pole piece according to claim 12, further comprising:

and a third measuring member (40), wherein the third measuring member (40) is arranged between the diaphragm providing device (4) and the rolling device (1), and the third measuring member (40) is used for measuring the weight per unit area and/or the thickness per unit area of the dry electrode diaphragm (7).

14. A method of manufacturing a battery pole piece, comprising:

applying a softening liquid to a first face (61) of an unwound current collector (6) such that the conductive adhesive on the first face (61) has a lower softening bonding temperature than the conductive adhesive on a second face (62) not coated with the softening liquid;

rolling and bonding a dry electrode membrane (7) on the first surface (61) to form a composite pole piece (8);

winding the composite pole piece (8) to obtain a coiled composite pole piece (8);

unreeling the coiled composite pole piece (8);

Rolling and bonding the dry electrode membrane (7) on the second surface (62) to form a battery pole piece;

and rolling the battery pole piece.

15. The method for manufacturing a battery pole piece according to claim 14, wherein the coating amount of the softening liquid is 0.03mg/cm ² -1mg/cm ² 。

16. The method of claim 14, wherein the rolling temperature of the rolling is 50 ℃ to 130 ℃.

17. The method of manufacturing a battery pole piece of claim 14, wherein the roll line pressure of the roll is 0.5 ton force/m to 80 ton force/m.

18. The method of manufacturing a battery pole piece of claim 14, wherein prior to winding the battery pole piece, further comprising: