CN210700919U

CN210700919U - Slit type coating test device for lithium battery pole piece

Info

Publication number: CN210700919U
Application number: CN201922109667.6U
Authority: CN
Inventors: 李涛; 曹华伟; 陶晶; 张紫方
Original assignee: Shenzhen Perfect Power Technology Co ltd
Current assignee: Shenzhen Perfect Power Technology Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-06-09
Anticipated expiration: 2029-11-29

Abstract

The utility model discloses a lithium battery pole piece slit formula coating test device can make the interval between coating die head and the foil adjusted in position and angle through the fixed coating subassembly of cantilever crane, can analyze out the coating effect of individual layer or multilayer coating technology under different coating angles, adopts non-contact heating device and contact warming mill can contrast out the effect of different drying methods and parameter to the coating effect, uses calibrator and scanner can accurately detect out coating foil thickness and surface imaging, lets the visual accuracy of slit formula coating process; the utility model discloses according to the uncertain factor that probably produces in the actual coating process, constitute test device through relevant structural design, it is wide to have application scope, the experimental effect is obvious, automatic and visual degree is high, can reach control accuracy, and the quick adjustment's of being convenient for effect has the characteristics that the practicality is strong in the aspect of lithium-ion battery pole piece slit formula coating experiment.

Description

Slit type coating test device for lithium battery pole piece

Technical Field

The utility model belongs to the technical field of lithium ion battery production, especially, relate to a lithium battery pole piece slit formula coating test device.

Background

The production and manufacture of lithium ion batteries is a process that is closely linked by a number of process steps. In general, the production of lithium batteries includes a pole piece manufacturing process, a battery assembly process, and final processes of liquid injection, pre-charging, formation, aging and the like. In the several stages of the process, each process step can be divided into several critical steps, and each step has a great influence on the final performance of the battery. The lithium battery electrode is a coating composed of particles, in the preparation process of the electrode, uniform wet slurry is coated on a metal current collector, then a solvent in the wet coating is removed through drying, the electrode slurry usually needs to be added with a polymer binder or a dispersing agent, a carbon black and other conductive agents, although the solid content is generally more than 30%, in the drying process, when the solvent is evaporated, the coating always undergoes certain shrinkage, solid substances are close to each other in the wet coating, and finally a porous dry electrode structure is formed. The lithium battery can be subdivided into five steps of slurry preparation, slurry coating, pole piece rolling, pole piece slitting and pole piece drying in the pole piece manufacturing process stage, wherein the slurry coating is a key process after the slurry preparation is finished, and the pole piece coating has important significance for the lithium battery and is mainly embodied in the following points: (1) the capacity of the finished battery is influenced, and in the coating process, if the thicknesses of the positive and negative electrode slurry coatings at the front, middle and rear three sections of the pole piece are inconsistent, the capacity of the battery is easily too low and too high, lithium precipitation is easily formed in the battery circulation process, and the service life of the battery is influenced; (2) the safety of the lithium battery is affected, various works are required before coating, particles, impurities, dust and the like are prevented from being mixed into the pole piece in the coating process, if the impurities are mixed into the pole piece, the internal micro short circuit of the battery is caused, and the battery is caused to be ignited and exploded in serious cases; (3) the consistency of the battery performance is influenced, and in the batteries of the same batch, if the consistency of parameters before and after the pole piece cannot be ensured in the pole piece coating process, the quality problems of the batteries, such as capacity difference, cycle life difference and the like, can be caused; (4) the service life of the battery is influenced, the difference before and after slurry coating is large, dust is mixed in the pole piece, the left and right thicknesses of the pole piece are not uniform, and the like, which are related to the electrochemical performance of the battery. Therefore, the pole piece coating process not only ensures the optimal coating slurry, but also ensures that the pole piece coating density is kept consistent and no impurities are mixed in the coating process. At present, pole piece coating equipment mainly comprises parts such as winding and unwinding unit, feed unit, tension control system, coating aircraft nose, oven, and the coating mode includes transfer formula coating and extrudes formula coating two kinds: the first transfer coating is that the coating roller rotates to drive the slurry, the slurry transfer amount is adjusted by adjusting the gap of a scraper, the slurry is transferred to the base material by the rotation of a back roller or the coating roller, the thickness of a coating layer is controlled according to the process requirement to meet the weight requirement, and simultaneously the solvent in the slurry paved on the base material is removed by drying and heating to ensure that the solid matter is well adhered to the base material. The slurry is exposed to air between the rolls, which has a partial effect on the properties of the slurry; the second extrusion Coating is that a feeding system conveys a Coating to a screw pump, then the slurry is conveyed to an extrusion head by power, the slurry is made into a liquid film by an extrusion mode and then coated on a moving current collector, and a Coating with uniform texture is formed after drying.

The surface treatment of the conductive base material of the battery by utilizing the functional coating is a continuously innovative technology in the industry, the carbon-coated aluminum foil/copper foil is that dispersed nano conductive graphite and carbon coated particles are uniformly and finely coated on the aluminum foil/copper foil, so that excellent static conductive performance can be provided, and micro-current of active substances is collected, so that the contact resistance between a positive/negative electrode material and a current collector can be greatly reduced, the adhesion capability between the positive/negative electrode material and the current collector can be improved, the usage amount of a binder can be reduced, and the overall performance of the battery is remarkably improved. The carbon-coated aluminum foil is more and more popular in the field of lithium batteries, particularly large power lithium batteries, and has the advantages that (1) the use consistency of a battery pack is remarkably improved, and the cost of the battery pack is greatly reduced, such as: the increase of the dynamic internal resistance of the battery cell is obviously reduced, the pressure difference consistency of the battery pack is improved, and the service life of the battery pack is prolonged; (2) improve the adhesive force of active material and current collector, reduce pole piece manufacturing cost, if: the adhesive force of the anode material and the collector electrode using an aqueous system is improved, the adhesive force of the nano-scale or submicron-scale anode material and the collector electrode is improved, the adhesive force of lithium titanate or other high-capacity cathode materials and the collector electrode is improved, and the qualified rate of pole pieces manufactured is increased; (3) reduce polarization, improve multiplying power and gram capacity, promote battery performance, if: partially reducing the proportion of binder in the active material, improving the electrical contact between the active material and the current collector; (4) the current collector is protected, the service life of the battery is prolonged, such as the corrosion and the oxidation of the current collector are prevented, the surface tension of the current collector is improved, the easy coating performance of the current collector is enhanced, and the current collector can replace etched foil with higher cost or replace the original standard foil with thinner foil. One of the key to successfully address the application of pole piece slurry is the selection of an appropriate coating method, and about 20 coating methods are known for applying liquid feed to a support, with each technique having a number of specialized configurations. In the laboratory research stage of lithium ion battery development, slot coating is the most comprehensive coating mode, and the coating method needs to consider factors including the number of coating layers, the thickness of a wet coating layer, the rheological property of a coating liquid, the required coating precision, a coating support or a substrate, the coating speed, the drying effect and the like. However, in the prior art, for example, a coating device disclosed in patent 201822248627.5, a coating material feeding system disclosed in patent 201821750278.0, and a double-side coater disclosed in patent 201811056610.8 all solve the related problems only from a single aspect, and there is no comprehensive test device or related complete equipment related to coating, and parameter configuration and measurement comparison of processes such as a coating angle, a coating speed, a drying method, and the like in the coating process cannot be obtained to achieve an optimal effect.

Disclosure of Invention

The utility model discloses a solve the problem that influences the coating effect factor among the pole piece slit formula coating process, provide a lithium-ion battery pole piece slit formula coating test device, make operating personnel can analyze out each link of coating process influence the relevant factor of coating effect and obtain relevant configuration data and effect through detecting.

The utility model provides a technical scheme is: a slit type coating test device for a lithium battery pole piece comprises a base, a support, an arm support, a coating assembly, a heating device, a heating roller, a feeding roller, a transmission roller, a positioning device, a thickness gauge, a scanner, a limiting roller and a cutting device, wherein the arm support, the heating device, the heating roller, the feeding roller, the transmission roller, the positioning device, the thickness gauge, the scanner, the limiting roller and the cutting device are fixed with the base through the support.

Further, the utility model discloses a lithium battery pole piece slit formula coating test device, heating device is 2 groups, 2 groups of heating device are interval between range and the mobile adjusting heating device from top to bottom through the support is fixed, 2 groups of heating device are provided with the heating wire respectively in the position that is close to the contact surface, the heating wire is single helical row or many cross arrangement and keeps on a plane.

Further, the utility model discloses a lithium-ion battery pole piece slit formula coating test device, the distancer below is equipped with positioner, the distancer passes through support fixed connection and keeps the interval with positioner, the distancer is provided with a plurality ofly, and the position height of distancer keeps unanimous, the mobile regulation of interval between the distancer.

Further, the utility model discloses a lithium-ion battery pole piece slit formula coating test device, the scanner below is equipped with positioner, the scanner passes through support fixed connection and keeps the interval with positioner.

Further, the utility model discloses a lithium-ion battery pole piece slit formula coating test device, spacing roller passes through the leg joint with the driving roller, leaves the interval between spacing roller and the driving roller, and spacing roller sets up the both ends position at the driving roller.

Further, the utility model discloses a lithium battery pole piece slit formula coating test device, be provided with the heating wire in the middle of the warming mill, the warming mill is the ceramic material.

Further, the utility model discloses a lithium-ion battery pole piece slit formula coating test device, the cantilever crane is "C" or "U" font, is provided with a plurality of coating subassemblies on the cantilever crane, the setting is the contained angle between coating module's the coating die head.

Further, the utility model discloses a lithium-ion battery pole piece slit formula coating test device, the fixed slot of cantilever crane is "ten", "meter", "worker", "big" one in the font hole groove.

Further, the utility model discloses a lithium-ion battery pole piece slit formula coating test device, be provided with display device and controlling means on the base, controlling means is the adjusting part who is arranged in control coating subassembly switch, coating slurry flow rate in the control coating subassembly, control heating device switch and intensification speed, control warming mill rotational speed and temperature, control material loading roller, driving roller switch and rotational speed, control thickness gauge, scanner, cutting device switch, display device and controlling means respectively with coating subassembly, heating device, warming mill, material loading roller, the driving roller, the thickness gauge, the scanner, cutting device is connected.

Further, the utility model discloses a lithium-ion battery pole piece slit formula coating test device, the base bottom is provided with a plurality of landing legs, the landing leg is helical structure, highly makes the base keep the level through the rotation regulation landing leg.

The utility model discloses a lithium battery pole piece slit formula coating test device, its advantage lies in, can make through the fixed coating subassembly of cantilever crane adjust the interval between coating die head and the foil in position and angle to can analyze out the coating effect of single-layer or multilayer coating technology under different coating angles, adopt non-contact heating device and contact warming mill can compare out the effect of different drying methods and parameter to the coating effect, use calibrator and scanner can accurately detect coating foil thickness and surface imaging, let the visual accuracy of slit formula coating process; the utility model discloses according to the uncertain factor that probably produces in the actual coating process, constitute test device through relevant structure combination, it is wide to have application scope, the experimental effect is obvious, automatic and visual degree is high, can reach control accuracy, and the quick adjustment's of being convenient for effect has leading advantage in the aspect of lithium-ion battery pole piece slit formula coating experiment.

Drawings

The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of a slit type coating test device for lithium battery pole pieces of the present invention;

fig. 2 is a schematic operation diagram of the slit coating test device for lithium battery pole pieces of the present invention;

fig. 3 is a schematic side view of a coating assembly of the slit coating test device for lithium battery pole pieces of the present invention;

fig. 4 is a schematic side structure view of a thickness gauge of the slit type coating test device for lithium battery pole pieces of the present invention;

fig. 5 is a schematic side view of a scanner of the slit coating test device for lithium battery pole pieces of the present invention;

fig. 6 is a schematic side view of a limiting roller of the slit type coating test device for lithium battery pole pieces of the present invention;

fig. 7 is a schematic structural diagram of a coating assembly in the slit type coating test device for lithium battery pole pieces of the present invention;

fig. 8 is a schematic structural diagram of a coating assembly arranged on an arm support in the slit type coating test device for lithium battery pole pieces of the present invention;

fig. 9 is a schematic structural diagram of a plurality of coating assemblies in the slit coating test device for lithium battery pole pieces of the present invention;

the designations shown in the drawings above are: the device comprises a base 1, a support 2, an arm support 3, a coating assembly 4, a heating device 5, a heating roller 6, a feeding roller 7, a driving roller 8, a positioning device 9, a thickness gauge 10, a scanner 11, a limiting roller 12, a cutting device 13, a carbon-coated aluminum foil 14, a supporting leg 15, a display device 16, a control device 17, a fixing groove 31, a coating die head 41, a fixing head 42, a rotating shaft 43, a feeding hole 44 and a heating wire 51.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further clearly and completely described below with reference to the accompanying drawings in the following embodiments and examples. The embodiments described herein are some of the embodiments of the present invention, and the exemplary embodiments and descriptions thereof are used to explain the present invention, but are not intended to limit the present invention.

A slit type coating test device for a lithium battery pole piece comprises a base 1, a support 2, an arm support 3, a coating assembly 4, a heating device 5, a heating roller 6, a feeding roller 7, a driving roller 8, a positioning device 9, a thickness gauge 10, a scanner 11, a limiting roller 12 and a cutting device 13, wherein the arm support 3, the heating device 5, the heating roller 6, the feeding roller 7, the driving roller 8, the positioning device 9, the thickness gauge 10, the scanner 11, the limiting roller 12 and the cutting device 13 are fixed with the base 1 through the support 2; as shown in fig. 7, the coating assembly 4 further includes a coating die head 41, a fixing head 42, and a rotating shaft 43, the coating die head 41 is provided with a feeding hole 44, the coating die head 41 is connected to the fixing head 42 through the rotating shaft 43, as shown in fig. 8, the arm support 3 is provided with a fixing groove 31, the fixing head 42 is engaged and fixed with the arm support 3 through the fixing groove 31, and the coating die head 41 can rotate around the rotating shaft 43.

The utility model discloses a lithium battery pole piece slit formula coating test device is mainly to adopting slit formula extrusion coating mode, through factors such as experimental study coating subassembly's mounted position, installation angle, coating slurry rheological property, coating rotational speed to the influence of coating effect to obtain even pole piece coating optimum combination parameter. The design and operating parameters of the extrusion nozzle must be within a suitable range, i.e., within the critical conditions known in the coating art as the "coating window", to enable proper coating. Because the lithium ion battery pole piece is the segmentation coating, produce the lithium ion battery of different models, the length of every section of pole piece that needs is different too, if adopt the continuous coating, cut and produce the pole piece in fixed length, need scrape the slurry coating on one end of every section of pole piece when assembling the battery, expose the metal foil, the technological route efficiency of cutting in fixed length of continuous coating is low, can't meet the needs of carrying on the production of scale finally, therefore change into and adopt the segmentation coating method of fixed length, coat according to the coating that the battery specification needs and blank length while coating, through adopting the computer control technology to the coating test device, design the pole piece coating process into the coating test device of light, machine, electricity integration intelligent control. And (3) inputting the designed operation parameters into a control device during coating, judging and analyzing whether pole piece coating is uniform finally by observing the effect of each stage, and automatically carrying out fixed-length segmentation and double-sided superposition coating. Therefore, the coating test device can set the coating length and the blank length at will to carry out sectional coating, and can meet the coating requirements of the pole pieces of lithium ion batteries of various models.

Example 1:

as shown in fig. 1, a slit type coating test device for a lithium battery pole piece comprises a base 1, a support 2, an arm support 3, a coating assembly 4, a heating device 5, a heating roller 6, a feeding roller 7, a driving roller 8, a positioning device 9, a thickness gauge 10, a scanner 11, a limiting roller 12 and a cutting device 13, wherein the arm support 3, the heating device 5, the heating roller 6, the feeding roller 7, the driving roller 8, the positioning device 9, the thickness gauge 10, the scanner 11, the limiting roller 12 and the cutting device 13 are fixed with the base 1 through the support 2; the heating devices 5 are 2 groups, the 2 groups of heating devices 5 are fixed by the bracket 2 and arranged up and down and can movably adjust the space between the 2 groups of heating devices, the heating wires 5 are respectively arranged at the positions of the 2 groups of heating devices 5 close to the contact surface, the heating wires 5 are arranged spirally or in a plurality of crossed ways and are kept on a plane, the heating wire is arranged in the middle of the heating roller 6, and the heating roller is made of ceramic materials; as shown in fig. 4, a positioning device 9 is arranged below a distance meter 10, the distance meter 10 and the positioning device 9 are fixedly connected through a bracket 2 and keep a distance, a plurality of distance meters 10 (5 in the figure) are arranged, the height requirements of the distance meters 10 are kept consistent, the distance meters 10 can be arranged on a linear sliding rod, and the distance between the distance meters 10 can be movably adjusted; as shown in fig. 5, a positioning device 9 is arranged below the scanner 11, and the scanner 11 and the positioning device 9 are fixedly connected through a bracket 2 and keep a distance; as shown in fig. 6, the limiting roller 12 is connected with the driving roller 8 through the bracket 2, a space is reserved between the limiting roller 12 and the driving roller 8, and the limiting roller 12 is arranged at two ends of the driving roller 8; as shown in fig. 7, the coating assembly 4 further includes a coating die head 41, a fixed head 42, and a rotating shaft 43, as shown in fig. 3, a feeding hole 44 is provided on the coating die head 41, and the coating die head 41 is connected with the fixed head 42 through the rotating shaft 43; as shown in fig. 8, the arm support 3 is in a "C" shape or a "U" shape lying on side, 1 coating assembly 4 is arranged on the arm support 3, a fixing groove 31 is arranged on the arm support 3, the fixing groove of the arm support 3 is one of a hole groove (cross in the figure) in the shape of "ten", "m", "i" and "da", a fixing head 42 is fixed to the arm support 3 by the fixing groove 31 in a clamping manner, and the coating die head 41 can rotate around a rotating shaft 43; the base 1 is provided with a display device 16 and a control device 17, the display device 16 and the control device 17 are respectively connected with the coating assembly 4, the heating device 5, the heating roller 6, the feeding roller 7, the transmission roller 8, the thickness gauge 10, the scanner 11 and the cutting device 13, the bottom of the base 1 is further provided with a plurality of supporting legs 15, the supporting legs 15 are of a spiral structure, and the base 1 is kept horizontal by rotatably adjusting the height of the supporting legs 15.

As shown in fig. 2, the operation steps of the pole piece coating test are as follows: firstly, the coated substrate is unreeled → spliced piece → pulling piece → tension control is completed, then the position and the angle of the coating assembly are adjusted, and then the coating process flow is carried out as follows → drying → thickness measurement → image scanning → reeling or cutting. The coating substrate (metal foil) is fed into the coating assembly by a driving roller to be coated, pole piece slurry is coated on the coating assembly in sections according to preset positions, angles, coating amount and blank length, a coated wet pole piece is fed into a drying device to be dried, the drying temperature is set according to the coating speed and the coating thickness, the drying roller can further carry out bottom surface contact type drying, the dried pole piece is detected by a thickness gauge, a plurality of point positions are respectively taken at a tangent position to be measured, high-precision scanning is carried out on the coated pole piece to observe the coating flatness, an image result is recorded, analyzed and displayed through a control device and a display device, and the visual test observation is realized in the whole coating process.

Example 2:

as shown in fig. 1, a slit type coating test device for a lithium battery pole piece comprises a base 1, a support 2, an arm support 3, a coating assembly 4, a heating device 5, a heating roller 6, a feeding roller 7, a driving roller 8, a positioning device 9, a thickness gauge 10, a scanner 11, a limiting roller 12 and a cutting device 13, wherein the arm support 3, the heating device 5, the heating roller 6, the feeding roller 7, the driving roller 8, the positioning device 9, the thickness gauge 10, the scanner 11, the limiting roller 12 and the cutting device 13 are fixed with the base 1 through the support 2; the heating devices 5 are 2 groups, the 2 groups of heating devices 5 are fixed by the bracket 2 and arranged up and down and can movably adjust the space between the 2 groups of heating devices, the heating wires 5 are respectively arranged at the positions of the 2 groups of heating devices 5 close to the contact surface, the heating wires 5 are arranged spirally or in a plurality of crossed ways and are kept on a plane, the heating wire is arranged in the middle of the heating roller 6, and the heating roller is made of ceramic materials; as shown in fig. 4, a positioning device 9 is arranged below a distance meter 10, the distance meter 10 and the positioning device 9 are fixedly connected through a bracket 2 and keep a distance, a plurality of distance meters 10 (5 in the figure) are arranged, the height requirements of the distance meters 10 are kept consistent, the distance meters 10 can be arranged on a linear sliding rod, and the distance between the distance meters 10 can be movably adjusted; as shown in fig. 5, a positioning device 9 is arranged below the scanner 11, and the scanner 11 and the positioning device 9 are fixedly connected through a bracket 2 and keep a distance; as shown in fig. 6, the limiting roller 12 is connected with the driving roller 8 through the bracket 2, a space is reserved between the limiting roller 12 and the driving roller 8, and the limiting roller 12 is arranged at two ends of the driving roller 8; as shown in fig. 7, the coating assembly 4 further includes a coating die head 41, a fixed head 42, and a rotating shaft 43, the coating die head 41 is provided with a feeding hole 44, and the coating die head 41 is connected with the fixed head 42 through the rotating shaft 43; as shown in fig. 8, the arm support 3 is in a "C" shape or a "U" shape lying on side, 2 coating assemblies 4 are arranged on the arm support 3, an included angle of 60 ° is formed between coating dies 41 of the coating assemblies 4, a fixing groove 31 is arranged on the arm support 3, the fixing groove of the arm support 3 is one of a "ten", "m", "i" and "da" shaped hole groove (cross in the figure), the fixing head 42 and the arm support 3 are fixed by clamping through the fixing groove 31, and the coating dies 41 can rotate around a rotating shaft 43; the base 1 is provided with a display device 16 and a control device 17, the display device 16 and the control device 17 are respectively connected with the coating assembly 4, the heating device 5, the heating roller 6, the feeding roller 7, the transmission roller 8, the thickness gauge 10, the scanner 11 and the cutting device 13, the bottom of the base 1 is further provided with a plurality of supporting legs 15, the supporting legs 15 are of a spiral structure, and the base 1 is kept horizontal by rotatably adjusting the height of the supporting legs 15.

The coating substrate (metal foil) is fed into two coating assemblies by a driving roller to carry out double-layer coating, the two coating assemblies can realize that two kinds of high-viscosity pole piece slurry with different properties or different types simultaneously carry out double-layer coating, the pole piece slurry is coated on the coating assemblies in sections according to preset positions, angles, coating amount and blank length, a coated wet pole piece is fed into a drying device to be dried, drying temperature is set according to coating speed and coating thickness, the drying roller can further carry out bottom surface contact type drying, the dried pole piece is detected by a thickness gauge, a plurality of point positions are respectively taken at one tangent line position to be measured, high-precision scanning is carried out on the coated pole piece to observe coating flatness, image results are recorded and analyzed and displayed through a control device and a display device, and visual test observation is realized in the whole coating process.

The utility model has the advantages that the spacing between the coating die head and the foil can be adjusted on the position and the angle by fixing the coating component by the arm support, so that the coating effect of the single-layer or multi-layer coating process under different coating angles can be analyzed, the non-contact heating device and the contact heating roller can be adopted to compare the effects of different drying modes and parameters on the coating effect, the thickness and the surface imaging of the coated foil can be accurately detected by using the thickness gauge and the scanner, and the slit type coating process is visualized and accurate; the utility model discloses according to the uncertain factor that probably produces in the actual coating process, constitute test device through relevant structure combination, it is wide to have application scope, the experimental effect is obvious, automatic and visual degree is high, can reach control accuracy, and the quick adjustment's of being convenient for effect has leading advantage in the aspect of lithium-ion battery pole piece slit formula coating experiment.

The objects, technical solutions and advantages of the present invention are further described in the detailed description according to the above disclosure and teachings of the embodiments, it should be understood that the above description is only an exemplary embodiment of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like within the spirit and principle of the present invention are included in the scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A slit type coating test device for a lithium battery pole piece comprises a base, a support, an arm support, a coating assembly, a heating device, a heating roller, a feeding roller, a transmission roller, a positioning device, a thickness gauge, a scanner, a limiting roller and a cutting device, wherein the arm support, the heating device, the heating roller, the feeding roller, the transmission roller, the positioning device, the thickness gauge, the scanner, the limiting roller and the cutting device are fixed with the base through the support.

2. The slit coating test device for lithium battery pole pieces as claimed in claim 1, wherein the heating devices are 2 groups, the 2 groups of heating devices are fixed by a bracket and arranged up and down and the spacing between the heating devices can be adjusted movably, the 2 groups of heating devices are respectively provided with heating wires at positions close to the contact surface, and the heating wires are arranged spirally or crosswise and are kept on a plane.

3. The slit type coating test device for the lithium battery pole pieces as claimed in claim 1, wherein a positioning device is arranged below the distance measuring instruments, the distance measuring instruments are fixedly connected with the positioning device through a support and keep a distance, the distance measuring instruments are arranged in a plurality, the height of the distance measuring instruments is kept consistent, and the distance between the distance measuring instruments can be movably adjusted.

4. The slit coating test device for the lithium battery pole piece as claimed in claim 1, wherein a positioning device is arranged below the scanner, and the scanner and the positioning device are fixedly connected through a bracket and keep a distance.

5. The slit type coating test device for the lithium battery pole piece according to claim 1, wherein the limiting roller is connected with the driving roller through a bracket, a space is reserved between the limiting roller and the driving roller, and the limiting roller is arranged at two ends of the driving roller.

6. The slit coating test device for lithium battery pole pieces as claimed in claim 1, wherein a heating wire is disposed in the middle of the heating roller, and the heating roller is made of ceramic.

7. The slit type coating test device for the lithium battery pole piece as claimed in claim 1, wherein the arm support is in a shape of "C" or "U", a plurality of coating assemblies are arranged on the arm support, and included angles are formed between coating dies of the coating assemblies.

8. The slit type coating test device for the lithium battery pole piece as claimed in claim 1, wherein the fixing groove of the arm support is one of a ten-, a meter-, a I-and a large-shaped hole groove.

9. The slit-type coating test device for the lithium battery pole piece according to claim 1, wherein the base is provided with a display device and a control device, and the display device and the control device are respectively connected with the coating assembly, the heating device, the heating roller, the feeding roller, the driving roller, the thickness gauge, the scanner and the cutting device.

10. The slit coating test device for the lithium battery pole piece as claimed in claim 1, wherein a plurality of support legs are arranged at the bottom of the base, the support legs are of a spiral structure, and the height of the support legs is adjusted by rotation to keep the base horizontal.