CN210805916U - Pole piece lithium replenishment device - Google Patents

Abstract

The utility model provides a lithium device is mended to pole piece. The pole piece lithium supplementing device comprises a first lithium belt unwinding mechanism, a pole piece unwinding mechanism, a rolling mechanism, a first traction mechanism, a pole piece winding mechanism and a first coating mechanism. The first lithium belt unwinding mechanism is used for arranging a lithium belt, and the pole piece unwinding mechanism is used for arranging a pole piece. The roll pressing mechanism comprises a first calendering roll, a first laminating roll and a second laminating roll. The first traction mechanism is used for drawing the lithium belt to enter between the first calendering roller and the first laminating roller, and the pole piece winding mechanism is used for winding the pole piece and drawing the pole piece to pass through between the first laminating roller and the second laminating roller. The first coating mechanism is located upstream of the rolling mechanism in the traveling direction of the lithium belt, and the first coating mechanism is used for coating the surface of the lithium belt with a coating.

Description

Pole piece lithium replenishment device

technical field

The utility model relates to the field of battery production, in particular to a pole piece lithium supplementing device.

Background technique

Lithium-ion batteries are widely used in consumer electronics and electric vehicles due to their high energy density, long service life, and green and pollution-free advantages. However, a solid electrolyte membrane (SEI film) will be formed in the lithium-ion battery during the first charge and discharge process, and the solid electrolyte membrane will consume part of the lithium, resulting in the loss of lithium, and this irreversible loss of the first capacity directly leads to the loss of the lithium-ion battery capacity. .

Utility model content

In view of the problems existing in the background art, the purpose of the present invention is to provide a pole piece lithium supplementing device, which can realize the lithium supplementation of the pole piece, simplify the lithium supplementation process, and save the lithium belt.

In order to achieve the above purpose, the utility model provides a pole piece lithium replenishing device, which includes a first lithium belt unwinding mechanism, a pole piece unwinding mechanism, a rolling mechanism, a first traction mechanism, a pole piece winding mechanism and a first a coating mechanism. The first lithium tape unwinding mechanism is used for setting the lithium tape, and the pole piece unwinding mechanism is used for setting the pole pieces. The rolling mechanism includes a first calendering roll, a first covering roll and a second covering roll. The first pulling mechanism is used for pulling the lithium strip into between the first calendering roll and the first cladding roll, and the pole piece winding mechanism is used for winding up the pole piece and pulling the Pole pieces pass between the first lamination roll and the second lamination roll. Along the running direction of the lithium belt, the first coating mechanism is located upstream of the rolling mechanism, and the first coating mechanism is used for coating the surface of the lithium belt with a coating.

The first pulling mechanism includes a pulling roller and a pulling belt, and the pulling belt is connected to the pulling roller. In the running direction of the lithium belt, the pulling roll is located downstream of the first calendering roll.

The pole piece lithium replenishing device further includes a lubricating mechanism and a cleaning mechanism, and the lubricating mechanism and the cleaning mechanism are arranged along the rotation direction of the first cladding roller. The lubricating mechanism is used for applying lubricant to the roll surface of the first covering roll, and the cleaning mechanism is used for cleaning the roll surface of the first covering roll.

The lubricating mechanism includes two coating heads, and the two coating heads are spaced apart along the axial direction of the first coating roll.

The lubricating mechanism further includes a guide member to which the two coating heads are slidably disposed in a direction parallel to the axial direction of the first coating roll.

The roll diameter of the first calendering roll is smaller than the roll diameter of the first cladding roll.

The ratio of the roll diameter of the first calendering roll to the roll diameter of the first laminating roll is 0.5-0.99.

The rolling mechanism further includes a first support roll, which is arranged opposite to the first calendering roll and is located on a side of the first calendering roll away from the first laminating roll. The roll diameter of the first backup roll is larger than the roll diameter of the first calender roll.

There are two groups of the first coating mechanisms, which respectively coat the two surfaces of the lithium belt. The two sets of first coating mechanisms both accommodate a release agent, and the surface roughness of the release agents in the two sets of first coating mechanisms is different.

The pole piece lithium replenishing device further includes a second lithium tape unwinding mechanism, a second pulling mechanism and a second coating mechanism. The second lithium tape unwinding mechanism is used for setting the lithium tape. The rolling mechanism further includes a second calendering roll, and the second calendering roll is arranged opposite to the second cladding roll. The second pulling mechanism is used for pulling the lithium belt provided by the second lithium belt unwinding mechanism into between the second calendering roll and the second cladding roll. Along the running direction of the lithium tape provided by the second lithium tape unwinding mechanism, the second coating mechanism is located upstream of the rolling mechanism, and the second coating mechanism is used for The surface of the lithium tape provided by the lithium tape unwinding mechanism is coated with a coating.

The beneficial effects of the utility model are as follows: the present application can realize the lithium supplementation of the pole piece, and integrate the rolling process and the cladding process of the lithium strip, thereby simplifying the lithium supplementing process, reducing the occupied space and reducing the production cost. By coating the surface of the lithium strip with a coating, it is ensured that the lithium strip can be smoothly transferred to the surface of the pole piece. The pulling mechanism can initially pull the lithium belt away, so that the coating mechanism can coat the surface of the lithium belt with a coating to prevent the lithium belt from adhering to the calendering roll and the cladding roll. At the same time, the traction mechanism can pull the coated lithium belt between the first calendering roll and the first cladding roll, avoiding the whole process of pulling the lithium belt and reducing the waste of the lithium belt.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of a pole piece lithium replenishing device.

FIG. 2 is another schematic diagram of the pole piece lithium replenishing device of FIG. 1 .

FIG. 3 is a schematic diagram of a lithium-replenishing device for a pole piece during a lithium-replenishing process.

FIG. 4 is a schematic diagram of the lubricating mechanism and the cleaning mechanism of the pole piece lithium supplementing device.

FIG. 5 is a schematic diagram of the lubricating mechanism of the pole piece lithium supplementing device.

FIG. 6 is a schematic diagram of a cleaning mechanism of the pole piece lithium replenishing device.

FIG. 7 is a schematic diagram of another embodiment of a pole piece lithium replenishing device.

FIG. 8 is another schematic diagram of the pole piece lithium replenishing device of FIG. 7 .

FIG. 9 is another schematic diagram of the pole piece lithium replenishing device during the lithium replenishing process.

Among them, the reference numerals are described as follows:

1 The first lithium belt unwinding mechanism

2 pole piece unwinding mechanism

3 Rolling mechanism

4 The first traction mechanism

5 pole piece winding mechanism

6 The first coating mechanism

7 Lubrication mechanism

8 Cleanup Agency

9 The second lithium belt unwinding mechanism

10 Second traction mechanism

11 Second coating mechanism

12 Pre-press rollers

31 The first calender roll

32 First clad roll

33 Second lap roll

34 First backup roll

35 Second calender roll

36 Second backup roll

41 Traction Roller

42 leash

71 Coating head

72 Guide member

81 Scraper

82 Cleaning components

83 Vacuum components

L lithium belt

P pole piece

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "a plurality" is a Refers to two or more (including two); unless otherwise specified or stated, the term "connection" should be understood in a broad sense, for example, "connection" may be a fixed connection, a detachable connection, or an integral connection, or an electrical connection. Connection, or signal connection; "connection" may be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described from the perspective shown in the accompanying drawings, and should not be construed as referring to the embodiments of the present application. limited. The present application will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

The pole piece lithium replenishing device of the present application can be used to supplement lithium on the pole piece P, so as to improve the capacity and cycle life of the lithium ion battery. The lithium replenishment process of the pole piece mainly includes a rolling process and a cladding process. The calendering process is to thin the lithium tape to form a lithium film, and the cladding process is to clad the lithium film on the surface of the pole piece P by rolling.

The pole piece P includes a current collector and an active material layer provided on the surface of the current collector. The current collector may be a metal foil, and the active material layer may include graphite or silicon.

Referring to FIGS. 1 and 2, the pole piece lithium supplementing device of the present application includes a first lithium strip unwinding mechanism 1, a pole piece unwinding mechanism 2, a rolling mechanism 3, a first traction mechanism 4, a pole piece winding mechanism 5 and The first coating mechanism 6 .

The first lithium tape unwinding mechanism 1 is used for setting the lithium tape L. The first lithium tape unwinding mechanism 1 includes a lithium tape unwinding roller, and the lithium tape L can be connected to the lithium tape unwinding roller by winding.

The pole piece unwinding mechanism 2 is used to set the pole piece P. The pole piece unwinding mechanism 2 includes a pole piece unwinding roller, and the pole piece P can be connected to the pole piece unwinding roller by winding.

The pole piece winding mechanism 5 is used for winding up the pole piece P and pulling the pole piece P. The pole piece winding mechanism 5 includes a pole piece winding roller, which is a driving roller. When it is necessary to supplement lithium, the free end of the pole piece P can be connected to the pole piece take-up roller, and the pole piece take-up roller drives the pole piece P to take away the tape through rotation.

The rolling mechanism 3 includes a first calendering roll 31 , a first covering roll 32 and a second covering roll 33 . The first calendering roll 31 , the first covering roll 32 and the second covering roll 33 are all flat rolls. The first calendering roll 31 , the first covering roll 32 and the second covering roll 33 can be arranged in sequence along the horizontal direction; of course, the first calendering roll 31 , the first covering roll 32 and the second covering roll 33 may be arranged according to requirements. It can also be arranged in the vertical direction, or in a triangular arrangement. The roll gap between the first calendering roll 31 and the first covering roll 32 can be adjusted according to needs, and the roll gap between the first covering roll 32 and the second covering roll 33 can be adjusted according to needs.

The first calendering roll 31 and the first cladding roll 32 may be used to calender the lithium belt L. When lithium supplementation is required, the lithium belt L can be drawn between the first calendering roll 31 and the first covering roll 32, and the lithium belt L is pressed by the roll pressure between the first calendering roll 31 and the first covering roll 32. Thin.

The first pulling mechanism 4 is used for pulling the lithium belt L into between the first calendering roll 31 and the first covering roll 32 . The pole piece winding mechanism 5 can draw the pole piece P to pass through between the first covering roll 32 and the second covering roll 33 .

The first coating mechanism 6 is located upstream of the rolling mechanism 3 along the running direction of the lithium belt L, and the first coating mechanism 6 is used for coating the surface of the lithium belt L with a coating. By setting the coating, the roughness of the two surfaces of the lithium strip L can be changed; when the lithium strip L is rolled by the first calendering roll 31 and the first cladding roll 32, the coating can reduce the difference between the lithium strip L and the first cladding roll 32. The adhesive force between the calendering rollers 31 and the adhesive force between the lithium tape L and the first coating roll 32, so that the thinned lithium tape L can be adhered to the first coating with a small adhesive force. The surface of the roll 32 facilitates the separation of the lithium belt L from the first calendering roll 31 and the separation of the lithium belt L from the first cladding roll 32 .

The first pulling mechanism 4 includes a pulling roller 41 and a pulling belt 42 , and the pulling belt 42 is connected to the pulling roller 41 . The pulling roll 41 is located downstream of the first calendering roll 31 in the running direction of the lithium belt L. The traction roller 41 is a driving roller. When the lithium belt L needs to be pulled for running, the traction belt 42 can be connected to the lithium belt L, and then the traction roller 41 will drive the lithium belt L to travel.

The lithium replenishing process of the pole piece lithium replenishing device of the present application in some embodiments is briefly described below.

When the pole piece P needs to be supplemented with lithium, set the coil material of the lithium tape L to the first lithium tape unwinding mechanism 1, and then drive the traction belt 42 to pass through between the first calendering roll 31 and the first cladding roll 32 , and attach the traction strap 42 to the end of the lithium strap L.

Set the coil material of the pole piece P to be supplemented to the pole piece unwinding mechanism 2, then pull the pole piece P to pass through between the first covering roller 32 and the second covering roller 33, and unwind the pole piece P. The ends are connected to the pole piece winding mechanism 5 . The pole piece winding roller of the pole piece winding mechanism 5 rotates and drives the pole piece P to travel.

The traction roller 41 rotates and drives the lithium belt L to travel through the traction belt 42 . When the lithium belt L passes through the first coating mechanism 6 , the first coating mechanism 6 coats the surface of the lithium belt L with a coating. Then, the coated lithium belt L is pulled by the first pulling mechanism 4 and enters between the first calendering roll 31 and the first cladding roll 32 . The nip between the first calendering roll 31 and the first cladding roll 32 is smaller than the thickness of the lithium belt L, so the first calendering roll 31 and the first cladding roll 32 can thin the lithium belt L. Under the action of the roll pressure, the two surfaces of the lithium belt L are respectively bonded to the first calendering roll 31 and the first covering roll 32 .

With the rotation of the first calendering roll 31 and the first cladding roll 32 , the lithium belt L is separated from the first calendering roll 31 and adhered to the roll surface of the first cladding roll 32 . At the same time, the thinned lithium belt L is separated from the traction belt 42 .

3, with the rotation of the first covering roller 32, the lithium tape L adhered to the roll surface of the first covering roller 32 enters between the first covering roller 32 and the second covering roller 33; The cladding roller 32 and the second cladding roller 33 roll the pole piece P and the lithium strip L on the roll surface of the first cladding roller 32, so that the lithium strip L is lapped on the surface of the pole piece P, and the Lithium supplement.

The first coating mechanism 6 is divided into two groups and coats two surfaces of the lithium belt L respectively. The two sets of first coating mechanisms 6 both accommodate release agents, and the surface roughness of the release agents in the two groups of first coating mechanisms 6 is different. The two sets of first coating mechanisms 6 coat the release agent on both surfaces of the lithium tape L, thereby forming coatings on both surfaces of the lithium tape L.

By setting different release agents in the two sets of first coating mechanisms 6 , the adhesive force between the lithium tape L and the first calendering roll 31 can be made smaller than the adhesion between the lithium tape L and the first coating roll 32 relay. Therefore, with the rotation of the first calendering roll 31 and the first cladding roll 32 , the lithium ribbon L is separated from the first calendering roll 31 and adhered to the roll surface of the first cladding roll 32 .

When the first calendering roll 31 and the first cladding roll 32 roll the lithium belt L, the lithium belt L is actually broken into several sections, but still adheres to the roll surface of the first cladding roll 32 . When the lithium belt L is crushed, the connection between the traction belt 42 and the lithium belt L will fail, so the traction belt 42 will fall off automatically and will not interfere with the lamination process of the lithium belt L and the pole piece P.

Under the rolling pressure of the first cladding roller 32 and the second cladding roller 33 , the lithium strip L will adhere to the pole piece P after being thinned. Since the release agent can reduce the adhesive force between the lithium tape L and the first coating roll 32 , the adhesive force between the lithium tape L and the pole piece P will be greater than that between the lithium tape L and the first coating roll 32 adhesion between. When the pole piece P passes through between the first cladding roll 32 and the second cladding roll 33 , the lithium tape L will be peeled off from the first cladding roll 32 under the action of the pole piece P.

The pole piece lithium replenishing device of the present application integrates the rolling process and the cladding process of the lithium strip L, thereby simplifying the lithium replenishing process, reducing the occupied space, and reducing the production cost. The first coating mechanism 6 can apply a coating on the surface of the lithium belt L to reduce the separation difficulty of the lithium belt L and the first calendering roll 31 and the separation difficulty of the lithium belt L and the first cladding roll 32, so as to ensure the lithium belt L L can be smoothly transferred to the surface of the pole piece P.

If the first pulling mechanism 4 is not provided, the lithium belt L needs to be manually pulled between the first calendering roll 31 and the first covering roll 32 , and the lithium belt is pulled by the first calendering roll 31 and the first covering roll 32 L transport. In this way, the first coating mechanism 6 cannot coat the initial section of the lithium belt L, causing the initial section of the lithium belt L to adhere to the surface of the first cladding roll 32 or the first calendering roll 31; The initial section of the belt L cannot be transferred to the surface of the pole piece P, resulting in waste of the lithium belt L, and at the same time reducing the flatness of the roll surfaces of the first cladding roll 32 and the first rolling roll 31, affecting the subsequent rolling of the lithium belt L .

In the present application, however, the first traction mechanism 4 can initially pull the lithium belt L for running, so that the first coating mechanism 6 can coat the surface of the lithium belt L with a coating to prevent the lithium belt L from adhering to the first On the calendering roll 31 and the first cladding roll 32, the waste of the lithium belt L is avoided.

The first coating mechanism 6 may adopt a coating method among transfer coating, extrusion coating or screen printing coating. The distance between the coating head of the first coating mechanism 6 and the lithium strip L can be adjusted, so that the thickness of the coating on the lithium strip L can be controlled.

Referring to FIG. 1 and FIG. 2 , the electrode lithium supplementing device of the present application further includes two pre-pressing rollers 12 . The two pre-pressing rollers 12 are located upstream of the first coating mechanism 6 along the running direction of the lithium tape L. The lithium belt L first passes between the two pre-pressing rollers 12 , and then passes through the first coating mechanism 6 . The two pre-pressing rollers 12 can pre-calender the lithium strip L to improve the thickness consistency of the lithium strip L, thereby significantly improving the effect of coating the surface of the lithium strip L with the release agent, avoiding the first coating mechanism 6 The coating head scratches the lithium belt L, which solves the problem of high requirements on the thickness consistency of the lithium belt L during the coating process. The thickness consistency of the lithium tape L is related to the manufacturing cost, and reducing the requirement for the thickness consistency of the lithium tape L can reduce the cost of the lithium tape L supplied.

Under the rolling action of the pre-compression roller 12, the compression amount of the lithium belt L is 10%-20%. Since the compression amount of the lithium belt L is small, it is not easy to adhere to the pre-compression roller 12 , so the two pre-compression rollers 12 can be arranged upstream of the first coating mechanism 6 .

In the present application, the roll diameter of the first calendering roll 31 is smaller than the roll diameter of the first cladding roll 32 . Different diameter rolling can be achieved by matching the diameters of large and small rolls. Compared with the same-diameter rolling, different-diameter rolling can reduce the rolling force of the lithium strip L, increase the contact area between the first cladding roll 32 and the lithium strip L, and improve the bite of the lithium strip L and the first rolling roll 31. Due to the entrapment effect and the bite effect of the lithium tape L and the first covering roll 32 , the lithium tape L is more easily adhered to the roll surface of the first covering roll 32 . In addition, with the increase of the roll diameter of the first cladding roll 32, the contact arc length between the lithium belt L and the first cladding roll 32 can be increased when the lithium belt L is rolled, and the lithium belt L is not easy to slip at high speed .

In addition, with the increase of the roll diameter of the first cladding roller 32, in the lamination process, the contact area and contact arc length between the lithium strip L and the pole piece P can be increased, so that the lithium strip L and the pole piece can be increased. Adhesion effect between P.

The ratio of the roll diameter of the first calendering roll 31 to the roll diameter of the first cladding roll 32 is 0.5-0.99. The roll diameter of the first calendering roll 31 is 100mm-200mm, the roll diameter of the first covering roll 32 is 200mm-400mm, and the roll diameter of the second covering roll 33 is 200mm-400mm.

During the rolling process of the lithium strip L, the linear speed of the first rolling roll 31 is lower than the linear speed of the first cladding roll 32 . In this way, different velocity rolling can be realized, and the rolling force of the lithium strip L can be reduced.

Since the roll diameter of the first calendering roll 31 is small, during the calendering process, the first calendering roll 31 is easily deformed, which reduces the thickness consistency of calendering. Preferably, the rolling mechanism 3 of the present application further includes a first support roll 34 , which is disposed opposite to the first calendering roll 31 and located on the side of the first calendering roll 31 away from the first laminating roll 32 . The roll diameter of the first backup roll 34 is larger than the roll diameter of the first reduction roll 31 .

The first support roller 34 and the first calendering roller 31 are in contact with each other and rotate relative to each other, which can reduce the deformation of the first calendering roller 31 during long-term use, improve the thickness consistency of the lithium belt L calendering, and prolong the service life of the equipment.

After the lithium strip L is laminated to the pole piece P, lithium scraps and mold release agent will remain on the roll surface of the first laminating roll 32. If not removed in time, the rolling and lamination of the lithium strip L will be affected.

Therefore, the pole piece lithium replenishing device of the present application further includes a cleaning mechanism 8 , and the cleaning mechanism 8 is used for cleaning the roller surface of the first cladding roller 32 . Specifically, the cleaning mechanism 8 includes a scraper 81 , a cleaning member 82 and a dust suction member 83 . The blade of the scraper 81 is in contact with the roll surface of the first coating roll 32 . With the rotation of the first covering roll 32 , the scraper 81 scrapes off the lithium scraps and mold release agent remaining on the roll surface of the first covering roll 32 . Referring to FIG. 6 , the dust suction member 83 may be located on the side of the scraper 81 to absorb the scraped lithium chips and mold release agent through the action of negative pressure. The cleaning member 82 is located downstream of the scraper 81 along the rotation direction of the first coating roll 32 , and the cleaning member 82 contacts the roll surface of the first coating roll 32 to further clean the rolling surface of the first coating roll 32 . The cleaning member 82 may be a brush.

In order to facilitate the cleaning mechanism 8 to clean the roll surface of the first cladding roller 32 , the pole piece lithium replenishing device of the present application further includes a lubricating mechanism 7 for applying lubricant to the roll surface of the first cladding roller 32 . The lubricating mechanism 7 and the cleaning mechanism 8 are arranged along the rotation direction of the first cladding roller 32 . The lubricant can reduce the difficulty for the scraper 81 to scrape lithium chips and release agent, and avoid scratching the roll surface of the first cladding roller 32; at the same time, under high-speed production, the lubricant can also prevent the scraper 81 from contacting the first cladding roller. Safety hazards such as smoke and fire caused by residual lithium dry friction on the surface of 32.

During the rolling process of the lithium strip L, the lithium strip L is extended in the width direction thereof. However, the extension area of the lithium tape L lacks a release agent, so that the edge of the lithium tape L along the width direction is not easily transferred to the surface of the pole piece P, but directly adheres to the surface of the first cladding roller 32 . The adhesive strength between the remaining area and the first covering roll 32 is high, and the first covering roll 32 is easily damaged by direct scraping with the scraper 81 .

Therefore, referring to FIG. 5 , the lubricating mechanism 7 of the present application includes two coating heads 71 , and the two coating heads 71 are arranged at intervals along the axial direction of the first coating roller 32 . The two coating heads 71 are used for coating the surface of the first coating roll 32 with lubricant, and the coating area of each coating head 71 corresponds to the edge area of the lithium belt L. At this time, the lubricant can reduce the difficulty for the scraper 81 to scrape off the lithium scraps and the release agent, and avoid scratching the roll surface of the first cladding roll 32 . The coating width of each coating head 7 can be adjusted, and the adjustment range can be 1mm-10mm.

The lubricating mechanism 7 further includes a guide member 72 to which the two coating heads 71 are slidably provided in a direction parallel to the axial direction of the first coating roller 32 . When the width specification of the lithium belt L is changed, it is only necessary to adjust the distance between the two coating heads 71 along the guide member 72 . That is to say, the lubricating mechanism 7 of the present application meets the requirements of lithium belts L of different specifications, and has good versatility.

The pole piece lithium replenishing device of the present application is further provided with a cleaning mechanism 8 for cleaning the first calendering roller 31 . Due to the different release agents on the two surfaces of the lithium belt L, almost no lithium scraps remain on the first rolling roll 31; even if the lithium scraps remain, the adhesion between the lithium scraps and the first rolling roll 31 is small. Therefore, the scraper 81 and the cleaning member 82 of the cleaning mechanism 8 can clean the first calendering roller 31 well, and there is no need to provide a lubricating mechanism 7 for lubricating the first calendering roller 31 .

7 to 9 , the pole piece lithium replenishing device further includes a second lithium tape unwinding mechanism 9 , a second pulling mechanism 10 and a second coating mechanism 11 .

The second lithium tape unwinding mechanism 9 is used for setting the lithium tape L. The second lithium tape unwinding mechanism 9 includes a lithium tape unwinding roller, and the lithium tape L can be connected to the lithium tape unwinding roller by winding.

The rolling mechanism 3 further includes a second calendering roll 35 , and the second calendering roll 35 is disposed opposite to the second cladding roll 33 . The second pulling mechanism 10 is used for pulling the lithium belt L provided by the second lithium belt unwinding mechanism 9 into between the second calendering roll 35 and the second cladding roll 33 . Along the running direction of the lithium tape L provided by the second lithium tape unwinding mechanism 9, the second coating mechanism 11 is located upstream of the rolling mechanism 3, and the second coating mechanism 11 is used in the second lithium tape unwinding mechanism. 9 The surface of the provided lithium strip L is coated.

The second traction mechanism 10 may be the same as the first traction mechanism 4 . Specifically, the second pulling mechanism 10 includes a pulling roller 41 and a pulling belt 42 , and the pulling belt 42 is connected to the pulling roller 41 .

The second calendering roll 35 and the second cladding roll 33 can be used to calender the lithium belt L. When it is necessary to supplement lithium, the lithium belt L can be pulled between the second calendering roll 35 and the second covering roll 33, and the lithium belt L is pressed by the roll pressure between the second calendering roll 35 and the second covering roll 33 Thin.

The second coating mechanism 11 is divided into two groups and coats two surfaces of the lithium belt L respectively. The two sets of second coating mechanisms 11 both accommodate release agents, and the surface roughness of the release agents in the two groups of second coating mechanisms 11 is different. The two sets of second coating mechanisms 11 coat the release agent on both surfaces of the lithium tape L, thereby forming coatings on both surfaces of the lithium tape L.

By setting different release agents in the two sets of second coating mechanisms 11 , the adhesive force between the lithium tape L and the second calendering roll 35 can be made smaller than the adhesion between the lithium tape L and the second coating roll 33 relay. Therefore, with the rotation of the second calendering roll 35 and the second cladding roll 33 , the lithium ribbon L is separated from the second calendering roll 35 and adhered to the roll surface of the second cladding roll 33 .

The lithium tape L adhered to the first coating roll 32 and the lithium tape L adhered to the second coating roll 33 are respectively coated on the two surfaces of the pole piece P, so that the two surfaces of the pole piece P are supplemented with lithium.

The second pulling mechanism 10 can initially pull the lithium belt L to run, so that the second coating mechanism 11 can coat the surface of the lithium belt L with a coating to prevent the lithium belt L from adhering to the second calendering roller 35 and the second rolling roller 35 On the cladding roller 33, the waste of lithium belt L is avoided.

The second coating mechanism 11 and the first coating mechanism 6 may be the same mechanism.

In the pole piece lithium replenishing device of the present application, two pre-pressing rollers 12 can be arranged upstream of the second coating mechanism 11 to roll the lithium tape L provided by the second lithium tape unwinding mechanism 9 to increase the thickness of the lithium tape L consistency.

The roll diameter of the second calendering roll 35 is smaller than the roll diameter of the second cladding roll 33 , thereby realizing different-diameter rolling and reducing the rolling force of the lithium strip L. During the rolling process of the lithium strip L, the linear velocity of the second calendering roll 35 is lower than the linear velocity of the second cladding roll 33 to achieve different velocity rolling and reduce the rolling force of the lithium strip L.

The rolling mechanism 3 of the present application further includes a second support roll 36 , which is disposed opposite to the second calendering roll 35 and located on the side of the second calendering roll 35 away from the second laminating roll 33 . The roll diameter of the second backup roll 36 is larger than the roll diameter of the second reduction roll 35 . The second support roller 36 can reduce the deformation of the second calendering roller 35 during long-term use, improve the thickness consistency of the calendering of the lithium belt L, and prolong the service life of the equipment.

The pole piece lithium supplementing device of the present application can also be provided with a lubricating mechanism 7 for lubricating the second cladding roller 33 and a cleaning mechanism 8 for cleaning the second cladding roller 33 . Among them, the lubricating mechanism 7 for lubricating the second coating roller 33 is the same as the lubricating mechanism 7 for lubricating the first coating roller 32, and the cleaning mechanism 8 for cleaning the second coating roller 33 is the same as that for cleaning the first coating roller 32. The cleaning mechanism 8 of the laminating roller 32 is the same.

The present application also provides a method for replenishing lithium with a pole piece. The method for replenishing lithium with the pole piece includes:

Set the lithium strip L to the first lithium strip unwinding mechanism 1, and set the pole piece P to the pole piece unwinding mechanism 2;

The end of the lithium belt L is connected to the first pulling mechanism 4, and the first pulling mechanism 4 pulls the lithium belt L and goes through the first coating mechanism 6, and the first coating mechanism 6 coats the surface of the lithium belt L. Floor;

The coated lithium belt L is drawn between the first calendering roll 31 and the first covering roll 32 under the pulling of the first pulling mechanism 4, and the first calendering roll 31 and the first covering roll 32 rotate and pull the lithium belt. L is thinned, and the lithium belt L is adhered to the roller surface of the first cladding roller 32 and separated from the first pulling mechanism 4;

The pulling pole piece P passes through between the first covering roll 32 and the second covering roll 33 and is connected to the pole piece winding mechanism 5;

The first cladding roll 32 and the second cladding roll 33 roll the pole piece P and the lithium tape L on the roll surface of the first cladding roll 32 , so that the lithium tape L is lapped on the surface of the pole piece P.

The method for replenishing lithium of a pole piece of the present application integrates the rolling process and the lamination process of the lithium strip L, thereby simplifying the lithium replenishing process, reducing the occupied space and reducing the production cost. The first coating mechanism 6 can apply a coating on the surface of the lithium belt L to reduce the separation difficulty of the lithium belt L and the first calendering roll 31 and the separation difficulty of the lithium belt L and the first cladding roll 32, so as to ensure the lithium belt L L can be smoothly transferred to the surface of the pole piece P.

The first pulling mechanism 4 can initially pull the lithium belt L to travel, so that the first coating mechanism 6 can apply a coating on the surface of the lithium belt L to prevent the lithium belt L from adhering to the first calendering roller 31 and the first calendering roller 31. On the cladding roller 32, the waste of the lithium belt L is avoided.

In the method for replenishing lithium in the pole piece, the linear velocity of the first calendering roll 31 is lower than the linear velocity of the first cladding roll 32, so as to achieve different velocity rolling, reduce the rolling force of the lithium strip L, reduce energy consumption, and reduce Small equipment load increases equipment service life.

Claims (10)

1. A pole piece lithium supplementing device is characterized by comprising a first lithium belt unreeling mechanism (1), a pole piece unreeling mechanism (2), a rolling mechanism (3), a first traction mechanism (4), a pole piece reeling mechanism (5) and a first coating mechanism (6);

the first lithium belt unreeling mechanism (1) is used for arranging a lithium belt (L), and the pole piece unreeling mechanism (2) is used for arranging a pole piece (P);

the rolling mechanism (3) comprises a first rolling roller (31), a first laminating roller (32) and a second laminating roller (33);

the first traction mechanism (4) is used for drawing the lithium strip (L) to enter between the first calendering roller (31) and the first laminating roller (32), and the pole piece rolling mechanism (5) is used for rolling the pole piece (P) and drawing the pole piece (P) to pass through between the first laminating roller (32) and the second laminating roller (33);

the first coating mechanism (6) is located upstream of the rolling mechanism (3) along the traveling direction of the lithium belt (L), and the first coating mechanism (6) is used for coating the surface of the lithium belt (L).

2. The pole piece lithium supplement device of claim 1,

the first traction mechanism (4) comprises a traction roller (41) and a traction belt (42), and the traction belt (42) is connected to the traction roller (41);

the drawing roll (41) is located downstream of the first calendering roll (31) in the tape running direction of the lithium tape (L).

3. The pole piece lithium supplement device of claim 1,

the pole piece lithium supplementing device further comprises a lubricating mechanism (7) and a cleaning mechanism (8), wherein the lubricating mechanism (7) and the cleaning mechanism (8) are arranged along the rotating direction of the first laminating roller (32);

the lubricating mechanism (7) is used for coating lubricant on the roller surface of the first laminating roller (32), and the cleaning mechanism (8) is used for cleaning the roller surface of the first laminating roller (32).

4. The pole piece lithium supplementing device according to claim 3, characterized in that the lubricating mechanism (7) comprises two coating heads (71), and the two coating heads (71) are arranged at intervals along the axial direction of the first laminating roller (32).

5. The pole piece lithium supplementing device according to claim 4, wherein the lubricating mechanism (7) further comprises a guide member (72), and the two coating heads (71) are slidably provided to the guide member (72) in a direction parallel to the axial direction of the first laminating roller (32).

6. The pole piece lithium supplementing device according to claim 1, wherein the roller diameter of the first calendering roller (31) is smaller than the roller diameter of the first laminating roller (32).

7. The pole piece lithium supplementing device according to claim 6, wherein the ratio of the roller diameter of the first calendering roller (31) to the roller diameter of the first laminating roller (32) is 0.5-0.99.

8. The pole piece lithium supplement device of claim 6,

the rolling mechanism (3) further comprises a first supporting roller (34), wherein the first supporting roller (34) is arranged opposite to the first calendering roller (31) and is positioned on one side, far away from the first laminating roller (32), of the first calendering roller (31);

the roll diameter of the first supporting roll (34) is larger than that of the first rolling roll (31).

9. The pole piece lithium supplement device of claim 1,

the first coating mechanisms (6) are divided into two groups and respectively coat two surfaces of the lithium strip (L) with coatings;

the two groups of first coating mechanisms (6) contain release agents, and the surface roughness of the release agents in the two groups of first coating mechanisms (6) is different.

10. The pole piece lithium supplement device of any one of claims 1 to 9,

the pole piece lithium supplementing device further comprises a second lithium belt unreeling mechanism (9), a second traction mechanism (10) and a second coating mechanism (11);

the second lithium belt unreeling mechanism (9) is used for arranging a lithium belt (L);

the rolling mechanism (3) further comprises a second calendering roller (35), and the second calendering roller (35) is opposite to the second laminating roller (33);

the second traction mechanism (10) is used for drawing the lithium strips (L) provided by the second lithium strip unreeling mechanism (9) into a position between the second calendering roller (35) and the second laminating roller (33);

and along the tape moving direction of the lithium tape (L) provided by the second lithium tape unwinding mechanism (9), the second coating mechanism (11) is positioned at the upstream of the rolling mechanism (3), and the second coating mechanism (11) is used for coating the surface of the lithium tape (L) provided by the second lithium tape unwinding mechanism (9).

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