CN115069768A - Pole piece processing technology and roughened pole piece - Google Patents

Abstract

The invention provides a pole piece processing technology and texturing pole piece, comprising the following steps: texturing a first to-be-textured roll and a second to-be-textured roll to obtain a first texturized roll and the second to-be-textured roll After finishing the texturing operation, install the obtained first texturing roll and the second texturing roll on the rolling machine, and form a rolling gap on the rolling machine; The coil end is pulled out and passed through the rolling gap between the two rolls. In the processing technology provided by the present invention, the electrode pole piece is firstly textured to obtain a textured pole piece with a significantly increased surface area. Electrode pieces can greatly improve the liquid absorption and adhesion between the pole pieces and the liquid, as well as the bonding ability between the pole pieces and the solid electrolyte, which significantly increases the performance of the energy storage device. It effectively solves the problem of solid-solid interface contact that has plagued the industry for a long time, greatly reduces the internal resistance of the battery, and improves the performance of the battery cycle life and other aspects.

Description

A kind of pole piece processing technology and textured pole piece

technical field

The invention relates to the technical field of battery pole pieces, in particular to a pole piece processing technology and a textured pole piece.

Background technique

In the electrochemical energy storage device, the electrode material is coated on the surface of the current collector foil to prepare a pole piece, and the foil plays the role of carrying active materials and transporting electrons.

Existing electrodes used in energy storage devices such as electrolytic capacitors, supercapacitors, lithium-ion supercapacitors, primary lithium batteries, lithium-ion batteries, and sodium-ion batteries are mainly made of electrode materials and current collector foils that are coated or composited. to make. For example, for an electrode in a lithium battery, the positive electrode uses aluminum foil as the current collector foil, and aluminum manganate is used as the electrode material; the negative electrode uses copper foil as the current collector foil, and graphite and the like are used as the electrode material.

In the prior art, in order to realize the preparation operation of the counter electrode, the electrode is rolled through a smooth metal roll, and the surface of the obtained pole piece is also very flat and smooth. Although this state achieves the uniformity of the thickness of the electrode material 14 of the pole piece and the uniformity of the areal density, on the other hand, it also reduces the surface bonding force and liquid absorption of the pole piece, especially for dry electrode technology and In the electrode composite technology of solid electrolyte, the smooth and flat electrode surface is not conducive to more sufficient contact and tighter bonding of the solid-solid interface, and the adhesion between the interfaces is not high.

At the same time, the existing technology mainly achieves the integrity of the pole piece itself by improving the bonding force between the electrode material and the current collector, but still cannot improve the contact ability between the outer surface of the pole piece and the electrolyte or another solid interface.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor result ability between the outer surface of the prepared pole piece and the electrolyte or solid interface in the prior art.

To this end, the present invention provides a pole piece processing process, comprising the following steps: performing texturing operations on a first to-be-textured roll and a second to-be-textured roll to obtain the first and second texturized rolls ; After completing the texturing operation, install the obtained first texturing roll and the second texturing roll on the rolling machine, and form a rolling gap on the rolling machine; The pole piece to be rolled is removed from the unwinding end Pulled out, and through the rolling gap between the double rolls, the textured pole piece obtained by rolling is rolled up, and after controlling the rolling mill to press down, the rolling mill and the unwinding equipment and the winding equipment are simultaneously turned on, and the tension control device is adjusted. , and gradually adjust the rolling and unwinding speed.

In the pole piece processing technology provided by the present invention, in the step of "texturing the first roll to be texturized and the second roll to be texturized to obtain the first roll and the second roll", It includes the following steps: placing the first roll to be texturized at the set position; corresponding to the first starting texturing point of the first roll to be texturized by the laser texturing system, controlling the start of the laser texturing system, and controlling the first starting texturing point The texturing point is subjected to the texturing operation; the laser texturing system is controlled to move horizontally relative to the first roll to be texturized, and the horizontal distance between the first initial texturing point and the first axial texturing point is x1; repeatedly control the horizontal movement of the laser texturing system relative to the first roll to be texturized, so that the distance between two adjacent first axial texturing points is x1, until the circumference of the first roll to be texturized A first axial anchor point group parallel to the axis of the first to-be-textured roll is formed; the first to-be-textured roll is controlled to rotate to the first circumferential textured point, wherein the first circumferential textured point The circumferential distance between the position and the corresponding first axial texturing point is y1, and the first to-be-textured roll is controlled to move horizontally with the first circumferential texturing point as the starting point, And the first axial anchor point group is formed in the horizontal direction; the first roll to be textured is repeatedly controlled to rotate, and the distance between two adjacent first circumferential textured points is y1, and The first axial anchor point group is formed with the corresponding first circumferential texturing point as the starting point; the second to-be-textured metal roll that is the same size as the first to-be-textured roll is selected, and the first to-be-textured roll is repeatedly prepared The first textured roll and the second textured roll are arranged relative to each other according to a preset pattern, and the first textured roll and the second textured roll are arranged oppositely. A rolling gap is formed between the two texturing rolls; firstly, the first starting texturing point of the first texturing roll and the second starting texturing point of the second to-be-textured roll are controlled to be relatively set; Control the first texturing roll to rotate relative to the second texturing roll, and the relative rotation distance is (y1-a)/2, where a is the diameter of the first starting texturing point; control the first texturing roll A texturing roll and the second texturing roll are offset along the axis direction, and the offset distance is (x1-a)/2;

The pole piece processing technology provided by the present invention further includes: a grinding step, measuring the surface roughness Ra, Rz and Rt of the bimetal roll, and controlling the first texturing roll and the second texturing roll to be arranged in parallel, so that the transverse The anchor point groups are staggered back and forth, and the outer surfaces of the first texturing roll and the second texturing roll are controlled to contact each other and press down. The bimetallic rolls are subjected to counter grinding; and the dust removal operation is performed on the first textured roll and the second textured roll after the counter-grinding operation is completed.

In the pole piece processing process provided by the present invention, (y1+a) can be divisible by the circumference of the roll (π*d), where d is the diameter of the first roll to be texturized.

In the pole piece processing technology provided by the present invention, in the operation step of texturing the first roll to be texturized and the second roll to be texturized, laser texturing or electric spark or electron beam is used for texturing.

The present invention also provides a textured pole piece, which is made by the pole piece processing technology provided by the present invention.

The technical scheme of the present invention has the following advantages:

1. The pole piece processing technology provided by the present invention comprises the following steps: carrying out a texturing operation on the first to-be-textured roll and the second to-be-textured roll to obtain the first and second texturized rolls; After the texturing operation is completed, the obtained first texturing roll and the second texturing roll are installed on the rolling machine, and a rolling gap is formed on the rolling machine; the pole piece to be rolled is pulled out from the unwinding end. , and through the rolling gap between the two rolls, the textured pole pieces obtained by rolling are rolled up. After controlling the rolling mill to press down, the rolling mill and the unwinding equipment and the winding equipment are turned on at the same time, and the tension control device is adjusted. Gradually Adjust the rolling and unwinding speed.

In the processing technology provided by the present invention, the electrode pole piece is textured for the first time to obtain a textured pole piece with a significantly increased surface area, and it is found that the textured pole piece can greatly increase the amount of liquid absorption and the liquid absorption between the pole piece and the liquid. The adhesion ability, as well as the bonding ability between the pole piece and the solid electrolyte, significantly increases the performance of the energy storage device. Especially in semi-solid batteries and solid-state batteries, the textured pole piece can significantly increase the bonding ability of the pole piece with the semi-solid electrolyte and solid electrolyte, effectively solving the problem of solid-solid interface contact that has plagued the industry for a long time, and greatly reducing the cost. The internal resistance of the battery improves the performance of the cycle life and other aspects.

2. In the pole piece processing technology provided by the present invention, during the texturing operation of the metal roll, the metal roll is controlled to form an axial anchor point group and a circumferential anchor point group in turn, and the axial anchor point group and the circumferential anchor point group are formed. The preparation processes are independent of each other.

During the rolling process of the pole piece, the texturing points themselves are arranged horizontally and horizontally. The winding device exerts a certain tension on the pole piece, which can effectively offset the local concentrated stress, so it can effectively avoid the occurrence of longitudinal line texture or local wrinkles in the prior art, and thus can avoid the pole piece in the width direction. Shrinkage occurs on top to ensure a good face shape.

3. The pole piece processing technology provided by the present invention uses electric spark, laser, electron beam and other texturing technologies to carry out texturing treatment on the surface of the metal roll to make a roll with uniform surface roughness, which is then installed on a rolling machine to be treated. The textured pole piece is subjected to textured roll pressing. Through physical methods, the surface of the pole piece is formed with uniform and tiny concave-convex morphology, which increases the surface area of the pole piece while ensuring the uniformity of the pole piece thickness and areal density, thereby increasing the liquid absorption capacity between the pole piece and the liquid. And adhesion ability, as well as increase the bonding ability between the pole piece and the solid, to achieve better electrochemical performance of the energy storage device.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the schematic diagram of the pole piece to be rolled provided by the present invention in the rolling process;

Fig. 2 is the force analysis diagram of the pole piece to be rolled provided by the present invention in the rolling process;

3 is a schematic structural diagram of a texturing pole piece, a first texturing roll and a second texturing roll provided by the present invention;

4 is a schematic structural diagram of a first roll to be textured and a second roll to be textured provided by the present invention;

5 is a schematic diagram of the arrangement corresponding to the second texturing roll during the rolling process;

Fig. 6 is the schematic diagram of rolling process;

FIG. 7 is a schematic diagram of the equipment for texturing the pole piece to be rolled according to the present invention.

Description of reference numerals in the examples:

1. Laser texturing system; 2. The first roll to be texturized; 21. The first starting texturing point; 22. The first axial texturing point; 23. The first axial anchor point group; 24. The first Circumferential texturing point; 25. The first circumferential anchor point group; 3. The second roll to be texturized; 32. The second axial texturing point; 33. The second axial anchor point group; 35, The second circumferential anchor point group; 4. Machine tool; 5. Horizontal track; 7. Texturing pole piece; 8. Pole piece to be rolled; 9. First texturing roll; 10. Second texturing roll; 11. Unwinding equipment; 12. Rewinding equipment; 13. Current collector foil; 14. Electrode material.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

This embodiment provides a pole piece processing process, as shown in Figures 1-7, including the following steps:

performing a texturing operation on the first to-be-textured roll and the second to-be-textured roll to obtain the first and second texturized rolls;

Specifically, the specific mode of the texturing operation is not limited. In the step of texturing the first roll to be texturized and the second roll to be texturized, laser texturing, electric spark or electron beam can be used to carry out texturing. Hairy.

After completing the texturing operation, the obtained first texturing roll and the second texturing roll are installed on a rolling machine, and a rolling gap is formed on the rolling machine;

The pole piece 8 to be rolled is pulled out from the unwinding end, and through the rolling gap between the double rolls, the textured pole piece 7 obtained by rolling is rolled up, and after the rolling mill is controlled to be pressed down, the rolling mill and the Unwinding equipment and winding equipment, adjust the tension control device, and gradually adjust the rolling and winding and unwinding speed.

In this embodiment, the current collector foil 13 is not textured, but the electrode pole piece is textured to obtain a textured pole piece with a significantly increased surface area, and it is found that this textured pole piece can greatly improve the electrode The amount of liquid absorption and adhesion between the sheet and the liquid, as well as the bonding ability between the polar sheet and the solid electrolyte, significantly increase the performance of the energy storage device. Especially in semi-solid batteries and solid-state batteries, the textured pole piece can significantly increase the bonding ability of the pole piece with the semi-solid electrolyte and solid electrolyte, effectively solving the problem of solid-solid interface contact that has plagued the industry for a long time, and greatly reducing the cost. The internal resistance of the battery improves the performance of the cycle life and other aspects.

Specifically, in the step of texturing the first and second to-be-textured rolls to obtain the first and second texturized rolls, the following detailed steps are included:

Put the first roll to be texturized in the set position;

Specifically, the first roll to be texturized can be made of a special alloy material for rolls or the like. Meanwhile, the set position can be placed on the lathe, and the set position belongs to the initial processing position of the first roll to be texturized;

The laser texturing system 1 is corresponding to the first initial texturing point 21 of the first roll to be texturized, and the laser texturing system 1 is controlled to start, and the first initial texturing point 21 is subjected to texturing operation;

Laser texturing technology uses a pulsed laser beam with high energy and high repetition frequency to irradiate the surface of the roll with negative defocus after focusing for preheating and strengthening. The side blowing device applies auxiliary gas with a set pressure and flow rate to the tiny molten pool, so that the molten material in the molten pool can accumulate to the edge of the molten pool as far as possible to form an arc-shaped boss according to the specified requirements.

Specifically, the structure of the laser texturing system 1 itself is not limited, as long as specific texturing points can be formed on the roll, as shown in the area z in FIG. 1 , the formed texturing points include raised parts and depressions;

Control the horizontal movement of the laser texturing system 1 relative to the first roll to be texturized, and the horizontal distance between the first initial texturing point 21 and the first axial texturing point 22 is x1;

Specifically, the movement mode of the laser texturing system 1 relative to the first roll to be texturized is not limited. The first roll to be texturized can be controlled to be stationary, and the movement of the laser texturing system 1 can be controlled; the laser texturing system 1 can also be controlled to be static, and the movement of the first roll to be textured can be controlled.

In this embodiment, as shown in FIG. 7 , the texturing operation is performed on the machine tool 4, the laser texturing system 1 is set on the horizontal rail 5, and a power device is connected to the laser texturing system 1, and the power device can be a motor, After the motor is started, the laser texturing system 1 moves on the horizontal rail 5, so as to realize the movement relative to the first roll to be texturized.

Repeatedly controlling the horizontal movement of the laser texturing system 1 relative to the first roll to be texturized, so that the distance between two adjacent first axial texturing points 22 is x1, until the circumference of the first roll to be texturized A first row of axial anchor point groups parallel to the axis of the first to-be-textured roll is formed on the busbar;

In this embodiment, as shown in FIG. 4 , a plurality of first axial texturing points 22 are formed, and the connecting lines between the plurality of first axial texturing points 22 are arranged horizontally, so as to form the first axial texturing point 22 . An axial anchor point group 23 . Specifically, the structure of the first axial anchor point group 23 is shown in FIG. 3 . The first axial anchor point group 23 extends in the horizontal direction, that is, the x-axis direction in FIG.

As shown in FIG. 4 , the first axial anchor point group 23 includes a plurality of first axial texturing points 22 arranged side by side with each other, and the length of the first to-be-textured rollers 2 is the length of two adjacent first Integer multiple of the distance between the axial texturing points 22.

The first to-be-textured roll 2 is controlled to rotate to the first circumferential textured point 24 of the second row, and a plurality of first circumferential textured points 24 form a first circumferential anchor point group 25, wherein The circumferential distance between the first circumferential texturing points 24 in the second row and the corresponding first axial texturing points 22 in the first row is y1, and the first roll to be textured is controlled. 2. Carry out horizontal movement with the first circumferential texturing point 24 of the second row as the starting point, and form the first axial anchor point group 23 of the second row in the direction of the second generatrix of the roller cylinder;

That is, as shown in FIG. 4, after completing the arrangement of a first axial anchor point group 23, the first to-be-textured roll 2 is controlled to rotate along the y-axis direction to the first circumferential textured point 24, At this time, starting from the first circumferential texturing point 24, a plurality of first axial texturing points 22 are sequentially formed along the x-axis direction.

In this step, the position of the first circumferential texturing point 24 is not limited, it may correspond to the tail of the previous first axial anchor point group 23, and only the first to-be-textured roll 2 needs to be controlled at this time. It is enough to rotate; as a variant, the first circumferential texturing point 24 can also correspond to the starting point of the previous first axial anchor point group 23. At this time, it is necessary to control the laser texturing system 1 to reset, and then Then control the first roll to be textured to rotate.

Specifically, the rotation direction of the first roll 2 to be texturized is not limited, and it can rotate clockwise or counterclockwise, as long as the rotation can be completed.

Repeatedly controlling the rotation of the first roll 2 to be texturized, as shown in FIG. 4 , the distance between two adjacent first circumferential texturing points 24 is y1, and the number corresponding to the Nth row is y1. The first circumferential textured point 24 is used as a starting point to form the first axial anchor point group 23 of the Nth row;

After this step is completed, a plurality of first axial anchor point groups 23 parallel to the axis of the first roll to be textured can be formed. At this time, in the x-axis direction and the y-axis direction of the first roll to be textured At the same time, the textured spots are evenly arranged.

Selecting a second to-be-textured metal roll with the same size as the first to-be-textured roll, repeating the steps of preparing the first to-be-textured roll to obtain a second to-be-textured metal roll;

Specifically, the material of the second to-be-textured metal roll and the first to-be-textured metal roll may be the same or different, as long as the diameter and length between the first to-be-textured roll 2 and the second to-be-textured roll 3 are ensured Just keep the parameters the same. At the same time, the second to-be-textured metal roll is controlled to adopt the same processing steps as the first to-be-textured roll, so as to obtain two rolls with the same textured point layout.

In this embodiment, a second axial anchor point group 33 and a second circumferential anchor point group 35 are sequentially formed on the second metal roll to be textured, and the second axial anchor point group 33 includes a plurality of second shafts With regard to the textured points 32, the second circumferential anchor point group 35 includes a plurality of second circumferential textured points.

After texturing, the first roll 2 to be textured will become the first roll 9 to be texturized, and the second roll 3 to be textured will become the second roll 10 to be textured.

The prepared first texturing roll 9 and the second texturing roll 10 are arranged opposite to each other, a rolling gap is formed between the first texturing roll 9 and the second texturing roll 10, and the control The pole pieces to be rolled pass through the rolling gap.

The adjustment steps for the first texturing roll and the second texturing roll are as follows: firstly control the first starting texturing point 21 of the first texturing roll 9 and the second starting point of the second texturing roll 10 Relative setting of the textured point;

The first starting texturing point 21 corresponds to the same position on the first roll 2 to be texturized and the first roll 9 to be textured, and the second starting texturing point is located on the second roll 3 to be textured and the second roll 9 The corresponding positions on the texturing roller 10 are the same;

Control the first texturing roll 9 to rotate relative to the second texturing roll 10, move the roll from point m to point n in the figure, and the relative rotation distance of the circumference is (y1-a)/2, Wherein a is the diameter of the first starting texturing point 21;

Controlling the first texturing roll 9 and the second texturing roll 10 to offset along the axis direction, and the offset distance is (x1-a)/2;

The unwinding device 11 and the winding device 12 are controlled to start, and the pole piece 8 to be rolled is passed through the rolling gap. The pole piece to be rolled is pulled out from the unwinding end and passed through the rolling gap between the double rolls to rewind the pole piece to be rolled. Adjust the tension control device to gradually adjust the rolling and unwinding speed.

Specifically, as shown in FIG. 6 , during the rolling process of the pole piece 8 to be rolled, the unwinding device 11 and the winding device 12 will respectively apply tension to the pole piece to be rolled, so that during the entire rolling process, the The rolled pole piece itself will be in a state of tension.

Analyze the stress of the pole piece 8 to be rolled obtained in this embodiment during the rolling process:

As shown in FIG. 2 , in the textured pole piece 7 obtained by this embodiment, during the rolling process of the pole piece 8 to be rolled, the textured points are arranged linearly in the X-axis direction, and multiple transverse textured points are formed. Point group, at this time, the uneven texture point group in the y-axis direction of the figure on both sides causes the pole pieces to generate inward concentrated stress of Fa and Fb respectively, and the tension control of winding and unwinding is performed during the rolling process. Generate two outward pulling forces, namely F _{pull 1} and F _{pull 2} , so that the tension can be adjusted so that F _{pull 1} =Fa, F _{pull 2} =Fb, the two outward pulling forces and the inward two pulling forces The concentrated stresses occur to cancel each other out respectively. Therefore, abnormal situations such as horizontal lines or wrinkles can be effectively avoided.

Specifically, the rolling process is done on a rolling mill. In this embodiment, after the preparation of the first texturing roll 9 and the second texturing roll 10 is completed, the rolls need to be cooled. After cooling, the rolls are removed and placed on a dry and clean soft support on the object waiting to be installed on the rolling mill.

Specifically, through the above arrangement, as shown in FIG. 3 , in the final formed textured pole piece 7 , along the extension direction of the y-axis, the first axial anchor point group 23 and the second axial anchor point group 33 are alternately arranged, but the second axial anchor point group 33 is offset relative to the first axial anchor point group 23 along the x-axis direction, and the offset distance is (x1-a)/2. At this time, as shown in area C in FIG. 3 , the connecting line between the first axial texturing point 22 and the second axial texturing point 32 forms an oblique line. In this embodiment, the inclination angle of the oblique line is The range is between 10°-80°.

Further, after the preparation of the first texturing roll and the second texturing roll is completed, the method further includes: a grinding step, measuring the surface roughness Ra, Rz and Rt of the bimetal roll, and controlling the first texturing roll It is arranged in parallel with the second texturing roll, so that the transverse anchor point groups are staggered back and forth, and the outer surfaces of the first texturing roll and the second texturing roll are controlled to contact each other and press down, and the pressing gap is controlled at Ra. Between 1-5 times, turn on the rolling mill to grind the textured bimetallic rolls;

A dust removal operation is performed on the first texturing roll and the second texturing roll after the grinding operation is completed.

Specifically, the dedusting step includes: installing a dedusting roller brush with a suction force that is consistent with the width of the rollers and connected to the dust cleaning device on one side of the two rollers on the rolling machine. The dust device sucks the brushed particles and dust away, and so rotates and reciprocates until the magnetic bar has no obvious metal impurities adsorption;

The demagnetization step includes: on one side of the two rolls on the rolling machine, the lower part of the roll brush is installed with a magnetic bar that is consistent with the width of the rolls. Remove the small metal magnetic particles that have not been removed by the dust removal roller brush, and check the effect of the roller brush to remove particles. The magnetic bar is always there. When it is found that there are obvious impurities attached to the magnetic bar, it is necessary to remove the magnetic bar and clean up the impurities in time. .

Through the above operations, the flatness of the surface of the texturing roll can be effectively improved.

Example 2

This embodiment provides a textured pole piece, which is made by the pole piece processing technology provided in Example 1.

In this embodiment, in order to test the performance of a worthwhile textured pole piece, the common non-textured pole piece in the prior art and the textured pole piece made in this embodiment are selected for performance testing. Non-textured positive pole pieces were tested for roughness, tensile strength, elongation, surface area, thickness uniformity of pole piece coating, uniformity of areal density, electrolyte absorption per unit capacity and the same solid electrolyte. The adhesion and other indicators of the film are shown in Table 1 for comparison.

Table 1 Comparison of basic properties of textured and non-textured pole pieces

It can be seen from Table 1 that the roughness, surface area, electrolyte absorption per unit capacity and solid electrolyte adhesion of the textured electrode are significantly greater than those of the non-textured electrode, while the tensile strength, elongation, coating thickness uniformity and electrode The areal density uniformity is comparable. This clearly reflects the design advantages of the textured pole piece. On the basis of little change in the original basic performance of the pole piece, the liquid absorption and adhesion between the pole piece and the liquid are increased, and the pole piece and the solid ability to combine.

Further, in the present embodiment, the textured pole pieces obtained after rolling the rollers obtained by different kinds of textured methods are tested, and the specific results are as follows:

Test Example 1: The first texturized roll and the second texturized roll were prepared by electrical spark disordered texturing, and further rolled to obtain a texturized pole piece. The first and second to-be-textured rolls with a diameter of d=150mm and an effective width of L=500mm were EDM-textured to make Ra of 3.0μm, Rz of 15μm, Rt of 18μm, and Rpc set to 90 of two disordered texturing rolls. The first texturing roll and the second texturing roll were mounted on a roll press, and the first texturing roll and the second texturing roll were preliminarily ground, and the pregrinding gap was set to 12 μm. After the pre-grinding is completed, put the 150μm lithium ion battery positive pole piece between the two rolls, turn on the roll press, adjust the appropriate pressure to emboss the rolls, obtain the pole piece and make the ternary positive electrode soft-packed lithium ion The batteries were tested as follows, and the results are shown in Table 2:

Table 2 The properties of the textured pole piece for roller imprinting by EDM disordered texturing

Test Example 2: The roll is subjected to texturing operation by using laser ordered texturing, and then the roll is further rolled through the first texturing roll and the second texturing roll to obtain a texturized pole piece. The first and second to-be-textured rolls with diameter d=150mm and effective width L=500mm were texturized to make Ra 5.0 μm, Rz 25 μm, Rt 30 μm, and Rpc set to 60. Laser ordered texturing rolls. The first texturing roll and the second texturing roll were mounted on a roll press, and the first texturing roll and the second texturing roll were preliminarily ground, and the pregrinding gap was set to 18 μm. After the pre-grinding is completed, put the 150μm lithium-ion battery positive pole piece between the first texturing roll and the second texturing roll, turn on the roll press, adjust the appropriate pressure to emboss the rolls, and obtain the pole piece and make it into The lithium-ion half-cells with solid electrolytes were tested as follows, and the test results are shown in Table 3:

Table 3 The properties of the texturized pole piece for roller imprinting by laser ordered texturing

Test Example 3: Use electron beams to sequentially texturize the rolls, and then pass through the first texturing roll and the second texturing roll to further roll to obtain a texturized pole piece. The first and second to-be-textured rolls with a diameter of d=150 mm and an effective width of L=500 mm were texturized, and were made into two sets with Ra of 10.0 μm, Rz of 25 μm, Rt of 30 μm, and Rpc of 30. Branch electron beam ordered texturing roll. The first texturing roll and the second texturing roll were mounted on a roll press, and the twin rolls were pre-ground with a pre-grinding gap of 20 μm. After the pre-grinding is completed, put the 120μm lithium-ion battery negative pole piece between the two rolls, turn on the roll press, adjust the appropriate pressure to emboss the rolls, make the textured pole piece and make it into an aluminum shell ternary positive pole, artificial The in-situ curing semi-solid lithium ion battery of graphite negative electrode was tested as follows, and the test results are shown in Table 4:

Table 4. The properties of textured pole pieces for roller imprinting by electron beam ordered texturing

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (6)

1. A pole piece processing technology is characterized by comprising the following steps:

performing texturing operation on the first roller to be textured and the second roller to be textured to obtain a first texturing roller and a second texturing roller;

after the texturing operation is finished, installing the obtained first texturing roller and the second texturing roller on a roller press, and forming a rolling gap on the roller press;

and drawing the pole piece to be rolled out from the unwinding end, rolling the roughened pole piece obtained by rolling through a rolling gap between the first roughening roller and the second roughening roller, controlling the rolling mill to be pressed downwards, simultaneously starting the rolling mill, unwinding equipment and winding equipment, adjusting a tension control device, and gradually adjusting the rolling speed and the unwinding speed.

2. The pole piece processing technology of claim 1, wherein in the step of performing texturing operation on the first roller to be textured and the second roller to be textured to obtain the first texturing roller and the second texturing roller, the method comprises the following steps;

placing a first roller to be roughened at a set position;

the laser texturing system is corresponding to a first starting texturing point position of a first roller to be textured, the laser texturing system is controlled to be started, and texturing operation is carried out on the first starting texturing point position;

controlling the laser texturing system to horizontally move relative to a first roller to be textured, wherein the horizontal distance between the first initial texturing point and the first axial texturing point is x 1;

repeatedly controlling the laser texturing system to horizontally move relative to the first roller to be textured, so that the distance between two adjacent first axial texturing points is x1, until a first axial anchor point group parallel to the axis of the first roller to be textured is formed on the circumference of the first roller to be textured;

controlling the first roller to be roughened to rotate to a first circumferential texturing point, wherein the circumferential distance between the first circumferential texturing point and the corresponding first axial texturing point is y1, controlling the first roller to be roughened to horizontally move by taking the first circumferential texturing point as a starting point, and forming the first axial anchor point group in the horizontal direction;

repeatedly controlling the first roller to be roughened to rotate, wherein the distance between two adjacent first circumferential texturing points is y1, and forming the first axial anchor point group by taking the corresponding first circumferential texturing points as starting points;

selecting a second metal roller to be roughened, wherein the size of the second metal roller to be roughened is consistent with that of the first roller to be roughened, and repeating the step of preparing the first roller to be roughened to obtain a second roughened metal roller;

the first texturing roller and the second texturing roller which are obtained through preparation are oppositely arranged according to a preset mode, and a rolling gap is formed between the first texturing roller and the second texturing roller;

firstly, controlling a first starting texturing point of the first texturing roller and a second starting texturing point of the second roller to be textured to be oppositely arranged;

controlling the first texturing roller to rotate relative to the second texturing roller, wherein the relative rotation distance is (y1-a)/2, and a is the diameter of the first texturing point;

and controlling the first texturing roller and the second texturing roller to offset along the axial direction, wherein the offset distance is (x 1-a)/2.

3. The pole piece machining process of claim 2, further comprising:

the method comprises the steps of oppositely grinding, namely measuring the surface roughness Ra, Rz and Rt of the bimetal roller, controlling the first texturing roller and the second texturing roller to be arranged in parallel, enabling a transverse anchor point group to be staggered front and back, controlling the outer surfaces of the first texturing roller and the second texturing roller to be in contact with each other and to be pressed down, controlling the pressing-down gap to be 1-5 times of Ra, and starting a rolling mill to oppositely grind the textured bimetal roller;

and carrying out dust removal operation on the first texturing roller and the second texturing roller after the opposite grinding operation is finished.

4. A process for machining pole pieces according to claim 3, characterized in that (y1+ a) is divisible by the circumference (pi x d) of the roll, where d is the diameter of the first roll to be textured.

5. The pole piece processing technology of claim 1, wherein in the step of texturing the first roller to be textured and the second roller to be textured, laser texturing or electric spark or electron beam texturing is adopted.

6. A texturing pole piece, which is characterized by being manufactured by the pole piece processing technology of any one of claims 1 to 5.

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