CN103272743A - A coating device for battery pole pieces - Google Patents

Abstract

The invention discloses a coating device for battery pole pieces, which comprises a coating roller and a back roller, and further comprises a conveyor belt group, a driver and a plurality of driven shafts with driven wheels, wherein the driver is provided with a main transmission shaft, the main transmission shaft is sleeved with a driving wheel, the conveyor belt group is sleeved on the driving wheel and the driven wheels and penetrates between the coating roller and the back roller to form a closed circulation loop, at least one blank-remaining separation belt is fixedly arranged between the conveyor belt groups, the conveyor belt group comprises two conveyor belts which are arranged in parallel at intervals, the blank-remaining separation belts are transversely arranged on the two conveyor belts along the direction vertical to the two conveyor belts, and each conveyor belt is sleeved on the corresponding driven wheel and the driving wheel. The invention has wide application range, can be applied to various types of coating equipment, automatically leaves white, does not need a doctor blade, has high efficiency and uniform coating thickness, and can avoid the phenomena of trailing and the like.

Description

A coating device for battery pole pieces

technical field

The invention relates to a battery processing method, in particular to a pole piece coating device for batteries such as lithium-ion batteries and nickel-hydrogen batteries.

Background technique

In the battery industry, lithium batteries have received more and more attention due to their advantages such as high energy density, high voltage, wide operating temperature range, and long life. Today, lithium-ion batteries dominate the primary (non-rechargeable) and secondary (rechargeable) battery markets and are used in electronic devices such as mobile phones, tablets, digital cameras and notebook computers.

The battery pole piece is an important part of the lithium battery and the core of the lithium battery. At present, the main processes in the production process of battery pole pieces are slurry, coating, rolling and shearing, among which coating is a key one among many processes. In order to connect the tabs smoothly, it is necessary to form a blank part during the coating process, that is, to form a blank strip on the current collector (aluminum foil or copper foil, etc.). At present, there are the following blanking methods: 1. Scraper blanking, 2. Rolling and back rolling separation blanking, 3. Squeezing blanking. These blanking methods have the following disadvantages: 1. There is serious tailing phenomenon, 2. The blank space is too long, which wastes materials. 3. The thickness of the blank space is uneven, which affects the quality of battery products. The coating devices of many existing coating machines mainly include a coating roller 1, a back roller 2 and a scraper 3 as shown in Figure 1 . Slurry 4 is provided on the coating roller 1, and the backing roller 2 drives the current collector 5 to rotate. Since the coating roller 1 and the backing roller 2 are close to each other, the slurry 4 is coated on the collector during the rolling process of the coating roller 1 and the backing roller 2. On the surface of the fluid 5, the scraper 3 keeps the slurry 4 on the coating roller 1 to have a certain thickness. When the length of the slurry 4 on the current collector 5 reaches a preset length, the current collector 5 on the coating roller 1 and the back roller 2 is separated to form a blank strip 6. When the length of the blank strip 6 reaches a preset length, The current collector 5 on the coating roller 1 and the back roller 2 contacts again, thereby making a pole piece with a blank strip 6 reserved.

The boundary of the blank strip 6 of the battery pole piece manufactured and processed by the above method is clear. But, in coating process, the rotating speed of coating roller 1 and backing roller 2 is constant, and in the two processes of coating slurry 4, reserving blank belt 6 again, the rotating speed of coating roller 1 and backing roller 2 is constant. Therefore, at the moment when the current collector 5 on the coating roller 1 and the back roller 2 are just in contact, their relative speed is relatively high, which will cause a "smearing" phenomenon on the pole piece, that is, the blank belt 6 on the pole piece is initially coated with slurry The slurry at the material place is thicker, forming protrusions, as shown in Figure 2, the "tailing" phenomenon occurs at A. In the process of compacting the pole piece with a trailing roller, the trailing part is subjected to a large force and often loses material. In addition, during the process of stacking or winding the pole pieces, the trailing part is extremely easy to drop.

Contents of the invention

The technical problem to be solved by the present invention is to provide a coating device for battery pole pieces, which can be applied to the type of coating equipment, automatic continuous blanking, uniform thickness, avoiding tailing phenomenon, no scraper, and high efficiency.

In order to solve the above technical problems, the present invention takes the following technical solutions:

A coating device for battery pole pieces, including a coating roller and a back roller. The device also includes a conveyor belt set, a driver, and several driven shafts with driven wheels. The driver is connected to a main transmission shaft, and the main transmission shaft is fitted There is a driving wheel, the conveyor belt set is set on the driving wheel and the driven wheel and passes between the coating roller and the back roller to form a closed loop, and a blank spacer belt is fixedly installed in the conveyor belt set.

The conveyor belt group includes two conveyor belts arranged in parallel at intervals, and the blank spacer belt is installed across the two conveyor belts along the vertical direction, and each conveyor belt is set on the corresponding driven wheel and driving wheel.

The conveyor belt is a chain, and the driven wheel and the driving wheel are gears matched with the chain. Or the conveyor belt is a belt.

The driver is a servo motor, a stepping motor or an air cylinder.

A cleaning tank for accommodating part of the conveyor belt is also provided on the closed loop formed by the conveyor belt. A liquid input pipe and a liquid recovery pipe communicated with the inside of the cleaning tank are fixed on the side wall of the cleaning tank. A nozzle pipeline connected with the liquid input pipe is arranged in the cleaning tank, and a cleaning nozzle is arranged on the nozzle pipeline.

A drying mechanism for drying the blank partition belt is also installed on the cleaning tank.

The drying mechanism includes a gas delivery pipeline and an air jet pipeline, and the gas injection pipeline communicates with the gas delivery pipeline.

An upper cover is also installed on the cleaning tank, which can prevent sundries from entering the cleaning tank.

The present invention can be widely used in various types of coating equipment. The conveyor belt moves with the blank spacer belt, so that the blank spacer belt can move through between the coating roller and the back roller, and can cover the collector in a certain period of time. Fluid (aluminum foil or copper foil, etc.), thus forming a blank strip, which can run continuously and evenly spaced, so that the coating thickness is uniform and there will be no tailing phenomenon, which greatly improves work efficiency and product quality.

Description of drawings

Accompanying drawing 1 is the schematic diagram of prior art sectional structure;

Accompanying drawing 2 is the battery pole piece made according to the prior art shown in Fig. 1;

Accompanying drawing 3 is the three-dimensional structure schematic diagram of the present invention.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 3, the present invention discloses a coating device for battery pole pieces, including a coating roller 6 and a backing roller 5, and the coating device also includes a conveyor belt group 1, a driver 9 and several belt driven wheels 3 The driven shaft 2, the driver 9 is equipped with the main transmission shaft 8, the main transmission shaft 8 is set with the driving wheel 7, the conveyor belt group 1 is set on the driving wheel 7 and the driven wheel 3 and from between the coating roller 6 and the back roller 5 A closed circulation loop is formed between passing through, and a blank spacer belt 4 is fixedly installed in the conveyor belt group 1, and at least one blank spacer belt 4 is installed. When there are a plurality of blank spacers 4, each blank spacer 4 is evenly or unevenly spaced on the conveyor belt group, and the specific number of blank spacers 4 can be set according to actual needs. The conveyor belt group 1 includes two conveyor belts 101 arranged in parallel at intervals, and the blank spacer belt 4 is installed on the two conveyor belts along the perpendicular direction with the two conveyor belts 101, that is, one end of the blank spacer belt is mounted on one of the conveyor belts, The other end is mounted on another conveyor belt. In this embodiment, each conveyor belt is set on the corresponding driven wheel 3 and the driving wheel 7, and there are two driving wheels 7 on the main transmission shaft 8, which are installed on the two ends of the main transmission shaft 8 respectively. Two driven wheels 3 are also respectively installed on the shaft 2, which are installed at both ends of the driven shaft 2, each driven shaft 2 and the main transmission shaft 8 are arranged in an irregular rectangle, and the conveyor belt 101 is set on the driving wheel 7 and the driven wheel 3 In this way, the conveyor belt forms an irregular polygonal closed loop, and the blank spacer belt 4 passes between the coating roller 6 and the back roller 5 . There is a certain distance between the two conveyor belts 101, which is generally greater than or equal to the axial length of the back roller, so that the length of the blank spacer belt installed between the two conveyor belts can be equal to or greater than the axial length of the back roller , can make the corresponding blank belt part on the current collector. Of course, the conveyor belt is not limited to the irregular polygon disclosed in this embodiment, but can also be in other regular or irregular shapes, which can be flexibly set according to the specific working environment space.

In addition, the conveyor belt group 1 can not only include two conveyor belts, but can also be four. At this time, there are also four driven wheels on the corresponding driven shaft, and four driving wheels on the main drive shaft, and all Two conveyor belts are installed at each end, and then the conveyor belts are set on the driven wheel and the driving wheel accordingly, that is, there are two conveyor belts on one side at this time, and there is still a certain distance between the conveyor belts on both sides, which is used for Install blank spacers. Other numbers of conveyor belts will not be described in detail here.

In addition, the conveyor belt 101 is a chain, the driven wheel 3 and the driving wheel 7 are both gears matching the chain, and the chain meshes with the gear. Or the conveyor belt is an ordinary belt, or a synchronous belt that can be used for conveying of other materials. At this time, the driven wheel and the driving wheel are wheels that match the belt, such as a conventional motor wheel that is used in conjunction with the synchronous belt. The driver is a servo motor, a stepper motor or a cylinder, or a synchronous motor, or an asynchronous motor, or other types of motors, or other drivers that can drive the main transmission shaft to rotate 360 degrees, and they are not listed here.

In addition, a cleaning tank 10 containing part of the conveyor belt is also provided on the closed loop formed by the conveyor belt 101 . The inner space of the cleaning tank 10 can be filled with a cleaning agent, which can be clear water or other commonly used cleaning agents for cleaning the blank spacers. A liquid input pipe 15 and a liquid recovery pipe 16 communicating with the interior of the cleaning tank 10 are fixed on the side wall of the cleaning tank 10. The liquid input pipe 15 extends to communicate with the cleaning agent from the outside, so that the cleaning agent enters the cleaning tank 10 through the liquid input pipe 15. In this way, the cleaning agent in the cleaning tank 10 can submerge the blank spacer belt 4, thereby removing the slurry on the blank spacer belt 4. The liquid recovery pipe 16 communicates with the waste water recovery tank that extends to the outside, so that part of the waste water can be treated and reused to save resources.

Of course, the cleaning tank 10 may not only be filled with cleaning agent to clean the blank spacer belt 4 . It is also possible to set an ultrasonic generating source in the cleaning tank, and use ultrasonic waves to clean the blank spacer belt, or introduce the ultrasonic waves emitted by the ultrasonic generating source into the cleaning tank through some pipes. Alternatively, magnetic resonance is used to clean the blank partition, that is, a magnetic resonance source is set in the cleaning tank. Or any other cleaning methods that can clean the blank spacers, which will not be listed here.

In order to be able to clean the blank spacer belt 4 more thoroughly, a nozzle pipeline (not shown) connected to the liquid input pipe 15 is arranged in the cleaning tank 10, and a cleaning nozzle is provided on the nozzle pipeline, and the cleaning nozzle can For the several water spray holes that are directly opened on the side wall of the shower pipe, or earlier on the side wall of the shower pipe, a plurality of through holes are provided, and then a shower head such as a shower type is installed on the through hole, or other conventional known shower heads. This will not be detailed one by one. The cleaning agent is sprayed out through the cleaning nozzle, so that the slurry or other dirt on the blank spacer can be cleaned more thoroughly.

In addition, a drying mechanism is fixedly installed on the cleaning tank 10, and the drying mechanism dries the blank spacer belt to keep its surface dry. The drying mechanism includes a gas delivery pipeline 14 and an air injection pipeline 12 , and the gas injection pipeline 12 communicates with the gas delivery pipeline 14 . Compressed gas can be input into the gas delivery pipeline, and a plurality of through holes can be opened on the side wall of the gas injection pipeline, and the gas can be sprayed out from the through holes. Or install some air outlet nozzles on the through hole, such as a conical air nozzle with a large inlet and a small outlet, so that the wind force is greater, so that the residual slurry or other dirt on the blank belt can be further blown away, It can also play the role of drying the white spacer. Of course, the drying mechanism can also dry with thermal energy. By fixing the heating pipe on the side wall of the cleaning tank, the temperature around the heating pipe is higher, so as to dry the blank belt. A heat conduction plate can also be arranged around the heating pipe to improve the uniformity of heat transfer. The drying mechanism can also directly transmit the hot air to the vicinity of the cleaning tank for the external hot air blower. Or other drying mechanisms capable of generating heat for drying, which are not listed here. Of course, the drying mechanism can also be installed separately, by designing a supporting rod, and then installing the drying mechanism on the supporting rod.

In addition, an upper cover 11 is installed on the cleaning tank 10 to prevent sundries from entering the cleaning tank. Multiple driven shafts can also be arranged in the cleaning tank to further stabilize the conveyor belt.

When the conveyor belt is installed with the driven wheel and the driving wheel, part of the driven wheel and the driving wheel are located on one side of the conveyor belt, and some of the driven wheels are located on the other opposite side of the conveyor belt. When the coating device is applied to the coating equipment, the driven shafts and driving shafts are correspondingly fixed on the coating equipment, and the cleaning tank is also fixedly installed or placed in the corresponding position. This installation method is a conventional assembly method, for Common knowledge known to those skilled in the art will not be described in detail here.

The coating device disclosed in the present invention can be applied to various types of coating equipment. There is slurry on the coating roller, the current collector (aluminum foil or copper foil, etc.) is driven by the backing roller, and the continuous rotation of the coating roller and the backing roller makes the slurry coated on the surface of the current collector. The driver works to drive the main transmission shaft to rotate, and the driving wheel rotates with the rotation of the main transmission shaft, so that the conveyor belt moves, and the blank spacer belt on the conveyor belt moves accordingly. A blank spacer belt is installed at intervals on the conveyor belt. Therefore, at regular intervals, a blank spacer belt will pass between the coating roller and the back roller. When passing through, it just blocks the surface of the current collector and is This part of the current collector covered by the blank spacer cannot be covered by the slurry, and the slurry is coated on the spacer to form a blank area on the current collector. With the continuous operation of the driver, the blank spacer belt coated with slurry continues to move through the coating roller and the backing roller, and moves into the cleaning tank, where the blank spacer belt is cleaned, so that the The slurry on the surface of the blank spacer belt is removed to make the surface of the blank spacer belt clean. Then the blank spacer is dried again by the drying mechanism, so that the spacer is kept dry on the surface. Then along with the continuous movement of the conveyor belt, the blank spacer belt will enter between the coating roller and the back roller again, through this cycle.

The number of blank spacers installed on the conveyor belt and the distance between adjacent blank spacers can be flexibly set according to the actual needs of the current collector, and the speed of the driver can be adjusted according to the customer's product requirements to make the space The spacer belt enters between the coating roller and the back roller at regular intervals to form a blank belt for the current collector, that is, to leave a blank for the current collector.

It should be noted that the above description is not a limitation to the technical solution of the present invention, and any obvious replacements are within the protection scope of the present invention without departing from the inventive concept of the present invention.

Claims (10)

1. A coating device for battery pole pieces, including a coating roller (6) and a back roller (5), characterized in that the device also includes a conveyor belt group (1), a driver (9) and several driven wheels The driven shaft (2) of (3), the driver is equipped with the main drive shaft (8), the drive wheel (7) is set on the main drive shaft, the conveyor belt set is set on the drive wheel and the driven wheel and passes from the coating roller and the back The rollers pass through to form a closed loop, and a blank spacer belt (4) is fixedly installed in the conveyor belt group. 2. The coating device for battery pole pieces according to claim 1, characterized in that, the conveyor belt group includes two conveyor belts (101) arranged in parallel at intervals, and a blank spacer belt spans the vertical direction of the two conveyor belts. Installed on two conveyor belts, each conveyor belt is set on the corresponding driven wheel and driving wheel. 3 . The coating device for battery pole pieces according to claim 2 , wherein the conveyor belt is a chain, and both the driven wheel and the driving wheel are gears matching the chain. 4 . 4 . The coating device for battery pole pieces according to claim 2 , wherein the conveyor belt is a belt. 5 . The battery pole piece coating device according to claim 1 , wherein the driver is a servo motor, a stepping motor or an air cylinder. 6. The coating device for battery pole pieces according to any one of claims 2 to 4, characterized in that, the closed loop formed by the conveyor belt is also provided with a cleaning tank (10 ). 7. The coating device for battery pole pieces according to claim 6, characterized in that a liquid input pipe (15) and a liquid recovery pipe (16) communicating with the inside of the cleaning tank are fixed on the side wall of the cleaning tank, A nozzle pipeline connected with the liquid input pipe is arranged in the cleaning tank, and a cleaning nozzle is arranged on the nozzle pipeline. 8 . The coating device for battery pole pieces according to claim 7 , wherein a drying mechanism for drying the blank spacers is installed on the cleaning tank. 9 . 9 . The coating device for battery pole pieces according to claim 8 , wherein the drying mechanism comprises a gas delivery pipeline ( 14 ) and an air injection pipeline ( 12 ), and the air injection pipeline communicates with the gas delivery pipeline. 10 . 10 . The coating device for battery pole pieces according to claim 9 , characterized in that an upper cover ( 11 ) is installed on the cleaning tank. 11 .

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