WO2024210682A1

WO2024210682A1 - Orientation device

Info

Publication number: WO2024210682A1
Application number: PCT/KR2024/004649
Authority: WO
Inventors: 김창수; 이상문
Original assignee: (주)씨앤아이테크놀로지
Priority date: 2023-04-07
Filing date: 2024-04-08
Publication date: 2024-10-10
Also published as: KR20240150385A

Abstract

Disclosed is a device, which, during a process in which a foil (substrate), having an anode active material (anode material) applied to one or both sides thereof, passes, by means of a conveying roller, through magnets disposed in a predetermined pattern, performs magnetic processing for orienting, by means of the magnetic field of the magnets arranged in a pattern, particles of the anode active material applied to the foil such that directionality is provided thereto, and thus improves the charge/discharge efficiency of a secondary battery, which is a finished product. An orientation device according to one aspect of the present invention comprises a flat magnetic assembly, which is disposed in pairs so as to orient an anode active material applied onto a foil passing therebetween, wherein the magnetic assembly is formed of a plurality of magnet lines which extend adjacent to each other in the longitudinal direction and in which pixel magnets are arranged in a row in the width direction, which is the direction in which the foil advances on a flat surface, and the plurality of magnet lines are repeated and arranged in the order of Halbach array line, S pole array line, Halbach array line, and N pole array line, and the plurality of magnet lines can be arranged to be inclined with respect to the width direction.

Description

Orientation device

The present invention relates to an orientation device, and more specifically, to a device for improving the charge and discharge efficiency of a secondary battery, which is a finished product, by magnetically processing particles of a negative electrode active material (negative electrode material) applied to a foil (substrate) to have a directionality by the magnetic field of a patterned magnetic body in a process in which a foil (substrate) having a negative electrode active material (negative electrode material) applied to one or both sides passes through magnets arranged in a certain pattern by a conveying roller.

Lithium secondary batteries recently being used in electric vehicles use organic electrolytes, and thus exhibit a discharge voltage that is more than twice as high as batteries using conventional alkaline aqueous solutions, resulting in high energy density.

As a cathode active material for lithium secondary batteries, oxides composed of lithium and transition metals with a structure that allows intercalation of lithium ions, such as LiCoO2, LiMn2O4, and LiNi1-xCoxO2 (0 < x < 1), are mainly used.

As negative active materials, various types of carbon-based materials including artificial and natural graphite and hard carbon that can insert and extract lithium have been applied, and recently, research on non-carbon-based negative active materials based on silicon or tin is being conducted to obtain higher capacity.

Meanwhile, the charge/discharge efficiency of the secondary battery varies depending on the particle uniformity of the graphite contained in the negative active material after application.

At this time, a negative active material is applied to a substrate, usually made of a metal plate, for example, a copper plate, and then a magnetic field is used to orient the substrate by passing it through a magnet before drying after application of the negative active material.

However, in the case of the orientation device using the conventional technology, since the permanent magnets are simply arranged in a row, the resistance value due to the eddy current is high, so there was a problem in transporting the foil at mass production speed (approximately 80 m/min).

The present invention is to solve the above problems, and an object of the present invention is to provide an orientation device capable of orienting a foil in a state where eddy current is reduced by controlling the arrangement of magnetic body assemblies arranged at a position through which the foil passes in various ways.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

According to one aspect of the present invention, there is provided an orientation device including a plate-shaped magnetic body assembly for orienting a negative active material applied to a foil arranged in a pair and passing therebetween, wherein the magnetic body assembly comprises a plurality of magnet lines formed by arranging pixel magnets in a single row along a width direction, which is a direction in which the foil advances on a plane, and extending in a plurality of adjacent magnet lines in a length direction, the plurality of magnet lines being arranged in a repeating order of a Halbach array line, a S pole array line, a Halbach array line, and a N pole array line, and the plurality of magnet lines are arranged to have an inclination with respect to the width direction.

At this time, the plurality of magnet lines may have a wave shape along the width direction.

At this time, the plurality of magnet lines can be formed by tilting in different directions at least twice.

At this time, the plurality of magnet lines may have first and second inclinations that are opposite to each other.

At this time, the inclination may have an angular range of 12 degrees to 32 degrees or an angular range of 17 degrees to 37 degrees with respect to the direction of foil travel.

At this time, the inclination of the plurality of magnet lines in the width direction can be determined by moving and arranging half the width of adjacent pixel magnets along the width direction.

At this time, the magnetic assembly may be formed by arranging the pixel magnets in a single layer.

At this time, the pixel magnets may be formed in a rectangular solid shape.

According to another aspect of the present invention, there is provided an orientation device including a plate-shaped magnetic body assembly for orienting a negative active material applied to a foil arranged in a pair and passing therebetween, wherein the magnetic body assembly is formed by a plurality of magnet lines in which pixel magnets are arranged in a single row along a width direction, which is a direction in which the foil advances on a plane, and which are extended adjacently along a length direction, and the plurality of magnet lines are repeatedly arranged in the order of a Halbach array line, a S pole array line, a Halbach array line, and a N pole array line, and the plurality of magnet lines are arranged so that at least one stage is formed with respect to the width direction and the vertical direction.

At this time, the magnetic assembly can form a spaced line in which magnets are not arranged along the longitudinal direction.

According to the above configuration, the orientation device according to one aspect of the present invention can provide a product that arranges the magnetic array of the Halbach array magnetic assembly to have an incline or step with respect to the foil transport direction, thereby lowering the eddy current intensity and making the magnetic field B-field value appear evenly, and improving the charge/discharge efficiency of the secondary battery by orienting the negative active material particles applied to the foil.

It should be understood that the effects of the present invention are not limited to the effects described above, but include all effects that can be inferred from the composition of the invention described in the detailed description or claims of the present invention.

FIG. 1 is a schematic diagram and an enlarged perspective view of an orientation device according to one embodiment of the present invention.

FIG. 2 is a plan view of a rib-type magnetic assembly in an orientation device according to the first embodiment of the present invention.

FIG. 3 is a magnetic field density distribution diagram of a rib-type magnetic body assembly in an orientation device according to the first embodiment of the present invention.

FIG. 4 is a magnetic field graph along the A direction of a rib-type magnetic body assembly in an orientation device according to the first embodiment of the present invention.

FIG. 5 is a magnetic field graph along the B direction of a rib-type magnetic body assembly in an orientation device according to the first embodiment of the present invention.

FIG. 6 is a graph of the average magnetic field of a rib-type magnetic body assembly in an orientation device according to the first embodiment of the present invention.

Figure 7 is a current density distribution diagram of a foil oriented in a rib type in an orientation device according to the first embodiment of the present invention.

FIG. 8 is a current vector distribution diagram of a foil oriented in a rib type in an orientation device according to the first embodiment of the present invention.

FIG. 9 is a graph of the force intensity due to the eddy current of a foil oriented in a rib type in an orientation device according to the first embodiment of the present invention.

FIG. 10 is a plan view of a V-array type magnetic assembly in an orientation device according to a second embodiment of the present invention.

FIG. 11 is a magnetic field density distribution diagram of a V-array type magnetic body assembly in an orientation device according to a second embodiment of the present invention.

FIG. 12 is a magnetic field graph along the A direction of a V-array type magnetic body assembly in an orientation device according to a second embodiment of the present invention.

FIG. 13 is a magnetic field graph along the B direction of a V-array type magnetic body assembly in an orientation device according to a second embodiment of the present invention.

FIG. 14 is a graph of the average magnetic field of a V-array type magnetic body assembly in an orientation device according to a second embodiment of the present invention.

FIG. 15 is a current density distribution diagram of a foil oriented in a V-array type in an orientation device according to a second embodiment of the present invention.

FIG. 16 is a current vector distribution diagram of a foil oriented in a V array type in an orientation device according to a second embodiment of the present invention.

Fig. 17 is a graph of the force intensity due to the eddy current of a foil oriented in a V-array type in an orientation device according to the second embodiment of the present invention.

FIG. 18 is a plan view of a double zigzag array type magnetic body assembly in an orientation device according to a third embodiment of the present invention.

FIG. 19 is a magnetic field density distribution diagram of a double zigzag type magnetic body assembly in an orientation device according to a third embodiment of the present invention.

FIG. 20 is a magnetic field graph along the A direction of a double zigzag array type magnetic body assembly in an orientation device according to a third embodiment of the present invention.

FIG. 21 is a magnetic field graph along the B direction of a double zigzag array type magnetic body assembly in an orientation device according to a third embodiment of the present invention.

FIG. 22 is a graph of the average magnetic field of a double zigzag array type magnetic body assembly in an orientation device according to a third embodiment of the present invention.

FIG. 23 is a current density distribution diagram of a foil oriented in a double zigzag arrangement type in an orientation device according to a third embodiment of the present invention.

FIG. 24 is a current vector distribution diagram of a foil oriented in a double zigzag arrangement type in an orientation device according to a third embodiment of the present invention.

FIG. 25 is a graph of the force intensity due to the eddy current of a foil oriented in a double zigzag arrangement type in an orientation device according to a third embodiment of the present invention.

FIG. 26 is a plan view of a magnetic body assembly of the QS array type in an orientation device according to the fourth embodiment of the present invention.

Figure 27 is a magnetic field density distribution diagram of a magnetic body assembly of the QS array type in an orientation device according to the fourth embodiment of the present invention.

Fig. 28 is a magnetic field graph along the A direction of a magnetic body assembly of the QS array type in an orientation device according to the fourth embodiment of the present invention.

FIG. 29 is a magnetic field graph along the B direction of a magnetic body assembly of the QS array type in an orientation device according to the fourth embodiment of the present invention.

Fig. 30 is a graph of the average magnetic field of a magnetic body assembly of the QS array type in an orientation device according to the fourth embodiment of the present invention.

Figure 31 is a current density distribution diagram of a foil oriented in a QS array type in an orientation device according to a fourth embodiment of the present invention.

Figure 32 is a current vector distribution diagram of a foil oriented in a QS array type in an orientation device according to a fourth embodiment of the present invention.

Figure 33 is a graph of the force intensity due to the eddy current of the foil oriented in the QS array type in the orientation device according to the fourth embodiment of the present invention.

Figure 34 is a graph showing the average magnetic fields of each embodiment according to the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly describe the present invention, parts that are not related to the description are omitted in the drawings, and the same reference numerals are assigned to the same or similar components throughout the specification.

The words and terms used in this specification and claims should not be construed as limited to their usual or dictionary meanings, but should be interpreted as having meanings and concepts consistent with the technical idea of the present invention, in accordance with the principles by which the inventor can define terms and concepts in order to best describe his or her invention.

Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to a preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention, so the corresponding configuration may have various equivalents and modified examples that can replace it at the time of filing of the present invention.

In this specification, the terms “include” or “have” are intended to describe the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood to not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

When a component is said to be "in front of," "behind," "above," or "below" another component, unless there are special circumstances, it includes not only being positioned "in front of," "behind," "above," or "below" the other component in direct contact with it, but also cases where there are other components intervening therebetween. Furthermore, when a component is said to be "connected" to another component, unless there are special circumstances, it includes not only being directly connected to one another, but also indirectly connected to one another.

Below, an orientation device (100) according to an embodiment of the present invention will be described with reference to the drawings.

An orientation device (100) according to one embodiment of the present invention is an orientation device including plate-shaped magnetic body assemblies (110, 120, 130, 140) arranged in pairs to orient a foil (1) passing therebetween.

In one embodiment of the present invention, a foil transport unit may include a pair of magnetic assemblies (110, 120, 130, 140) for orienting a foil transported by a magnetic field.

Referring to Fig. 1, the above foil transport unit can transport foil (1), which is usually provided in a roll form, by unrolling it and passing it between a pair of magnetic body assemblies (110, 120, 130, 140).

Typically, such a foil conveyor may include a conveying roller (2).

Referring to FIG. 1 and FIG. 33, the above magnetic assembly (110, 120, 130, 140) may be formed by arranging a plurality of magnet lines in a row along the width direction, which is the direction in which the foil (1) advances on a plane, and extending a plurality of magnet lines adjacent to each other along the length direction.

At this time, the plurality of magnetic lines can be repeatedly arranged in the order of Halbach array lines (111, 121, 131, 141), S pole array lines (112, 122, 132, 142), Halbach array lines (111, 121, 131, 141), N pole array lines (113, 123, 133, 143). That is, the S pole array lines (112, 122, 132, 142) and N pole array lines (113, 123, 133, 143) are alternately arranged between each Halbach array line (111, 121, 131, 141), thereby forming a magnetic body assembly.

Here, the plurality of magnet lines can be arranged to have an inclination with respect to the width direction. That is, the pixel magnets of the magnetic body assembly can be arranged so that the magnet lines have a constant inclination with respect to the transport direction of the foil.

At this time, for example, referring to FIG. 2, the magnetic body assembly (110) is formed in a plate shape and is arranged so that the longitudinal direction of the magnetic body assembly (110) is perpendicular to the foil progress direction. Accordingly, the foil progress direction and the width direction can be arranged parallel to each other.

At this time, the pixel magnets may be formed in a rectangular solid shape.

In this way, the magnetic assembly of the orientation device according to the present invention can be formed in various arrangements as described above, and the electrical and magnetic characteristics of the foil after each orientation are different from each other. Accordingly, a magnetic assembly having suitable characteristics can be selected depending on the purpose and product for which the foil is provided.

Meanwhile, in these magnetic assemblies, various arrangements can be considered according to the arrangement of pixel magnets, and by measuring the magnetic field exposure amount and the magnetic field non-uniformity of the scanned foil for magnetic assemblies having different arrangements, a magnetic assemblies providing a suitable orientation can be selected.

Here, the values related to the magnetic field (B-Field) exposure of the magnetic body assembly can be found through the equations and calculations below.

First, the magnetic field exposure is the average magnetic field the foil is exposed to while being scanned (in Wb/m ² sec).

At this time, the average magnetic field is the average value (Wb/m ² ) of the accumulated magnetic field in the direction of foil travel.

Here, the scan time is the time it takes for the foil to pass through the width of the magnetic assembly. The scan time can be obtained by dividing the width of the magnetic assembly of the foil by the moving speed of the foil.

At this time, the moving speed of the foil (1) can be controlled through the rotation speed of the transport roller (2).

Therefore, for example, if the width of the foil (1) is 600 mm, the moving speed of the foil implemented by the conveying roller (2) is 80 m/min (1.33 m/sec), and the average magnetic field measured is 0.66 T, the magnetic field exposure amount can be calculated as follows.

Magnetic field exposure = 0.66 × 0.45 = 0.296 Wb/m2·sec

This case is explained using the Halbach transverse arrangement as an example.

Here, the Halbach vertical array and the Halbach horizontal array can be manufactured. At this time, in the case of the Halbach vertical array, a plurality of magnet lines are arranged as described above, but the Halbach magnet lines are arranged in a direction parallel to the width direction, which is the direction of foil movement, and the magnetic body assembly is manufactured. In contrast, in the case of the Halbach horizontal array, the Halbach magnet lines are arranged in parallel in the length direction, which is perpendicular to the direction of foil movement.

These magnetic body assemblies of Halbach transverse and Halbach longitudinal arrays can be assumed as basic array forms, but as described later, the orientation characteristics of the foil after orientation are poor.

The magnetic field unevenness is the magnetic field unevenness accumulated on the scanned foil. Here, it means the unevenness of the average value of the magnetic field values measured in 10 mm units in the foil width direction, and can be calculated as shown in the equation below.

[Table 1]

Referring to Table 1 above, the measurement results of various embodiments with various arrangements are described.

Here, the embodiment of the QS array, which is the fourth embodiment, is shown to have the best orientation characteristics. That is, although the eddy current is the smallest, the magnetic field non-uniformity value is also small, showing the best performance.

At this time, two factors may be important in judging excellent orientation characteristics. First, the eddy current must be small, which causes resistance when transporting the foil due to the eddy current, which makes the transport of the foil unstable, making it difficult to control the speed, and reducing productivity due to the decrease in speed. Second, it is important that the values of the magnetic field are all evenly displayed.

In addition, in the case of an obtuse angle with respect to the longitudinal or transverse direction of the magnet line, the eddy current improves but the uniformity worsens, and conversely, in the case of an acute angle, the perfect current worsens but the uniformity improves, so a compromise must be made.

At this time, referring to Table 1, in the case of the Halbach horizontal arrangement, the force intensity due to the eddy current was too large at 225 N, so it was excluded from application, and in the case of the Halbach vertical arrangement, the non-uniformity was 96.4%, which was also too large a value compared to other arrangements, so it was excluded from application.

Below, the output result values are examined by referring to the drawings and Table 1 for each example.

Referring to FIG. 2, a plan view of a rib type magnetic assembly (110) in an orientation device according to a first embodiment of the present invention is illustrated, and referring to FIG. 3, a magnetic field density distribution of a rib type magnetic assembly in an orientation device according to a first embodiment of the present invention is illustrated, and referring to FIG. 4, a magnetic field graph along the A direction of a rib type magnetic assembly in an orientation device according to a first embodiment of the present invention is illustrated, and referring to FIG. 5, a magnetic field graph along the B direction of a rib type magnetic assembly in an orientation device according to a first embodiment of the present invention is illustrated, and referring to FIG. 6, an average magnetic field graph of a rib type magnetic assembly in an orientation device according to a first embodiment of the present invention is illustrated, and referring to FIG. 7, a current density distribution of a foil oriented in the rib type in an orientation device according to a first embodiment of the present invention is illustrated. Referring to FIG. 8, a current vector distribution diagram of a foil oriented in a rib type in an orientation device according to a first embodiment of the present invention is illustrated, and referring to FIG. 9, a force intensity graph due to an eddy current of a foil oriented in a rib type in an orientation device according to the first embodiment of the present invention is illustrated.

In the illustrated embodiment, referring to FIG. 2, a plurality of magnet lines are formed in a V-shape centered around the center in the width direction.

At this time, the plurality of magnet lines are formed with an incline that goes down to the center at a first incline based on the drawing of Fig. 2 and then goes up again at a second incline facing from the center in order to have a rib shape. Of course, this incline can be formed by arranging each pixel magnet (111, 112, 113) forming the magnet line.

At this time, one pixel magnet is formed with the same length and width, but is not limited to this.

At this time, θ1 is formed in an angle range of 12 degrees to 32 degrees. That is, the first slope is -θ1, and the second slope is θ1, and they are arranged in a symmetrical form centered on the center of the width.

This angular range allows for testing by increasing and decreasing the angle by about 1 degree, and it was found that if the pixel magnets are arranged at an angle outside this angular range, unfavorable results in the orientation characteristics are produced.

In the illustrated embodiment, referring to FIG. 3, it can be seen that the magnetic field density distribution of the magnetic body assembly is formed along the first slope and the second slope. That is, it can be seen that the magnetic field density distribution is formed along the arrangement of the pixel magnets.

Referring to FIGS. 4 to 6, the intensity of the magnetic field was measured along the A and B directions shown in FIG. 3, and it also changed depending on the arrangement of the magnets. The maximum value was 0.69, the minimum value was 0.54, and as a result, the magnetic field unevenness was 12.3%.

In the illustrated embodiment, referring to FIGS. 7 to 9, the current density distribution of the scanned foil is illustrated, which has a similar shape along multiple magnet lines, and referring to FIG. 9, the resulting force value due to the eddy current is 25.5 N, which is good.

Referring to FIG. 10, a plan view of a V-array type magnetic assembly (120) in an alignment device according to a second embodiment of the present invention is illustrated, and referring to FIG. 11, a magnetic field density distribution diagram of a V-array type magnetic assembly in an alignment device according to a second embodiment of the present invention is illustrated, and referring to FIG. 12, a magnetic field graph along the A direction of a V-array type magnetic assembly in an alignment device according to a second embodiment of the present invention is illustrated, and referring to FIG. 13, a magnetic field graph along the B direction of a V-array type magnetic assembly in an alignment device according to a second embodiment of the present invention is illustrated, and referring to FIG. 14, an average magnetic field graph of a V-array type magnetic assembly in an alignment device according to a second embodiment of the present invention is illustrated, and referring to FIG. 15, a current density distribution diagram of a foil oriented in the V-array type in an alignment device according to a second embodiment of the present invention is illustrated, and referring to FIG. 16, a V-array type magnetic assembly in an alignment device according to a second embodiment of the present invention is illustrated. A current vector distribution diagram of a foil oriented in an array type is illustrated, and with reference to FIG. 17, a force intensity graph due to an eddy current of a foil oriented in a V array type in an orientation device according to a second embodiment of the present invention is illustrated.

In the illustrated embodiment, referring to FIG. 10, a plurality of magnet lines are formed with an upward slope (θ2) and a downward slope (-θ2) with respect to the center of the length direction as a reference point in the drawing, and the slopes are formed identically but in different directions to form symmetry. This slope can be made to have this slope by arranging each pixel magnet forming the magnet line.

At this time, θ2 is formed at approximately 17 to 37 degrees. That is, it is arranged in a symmetrical form with a slope that rises to θ2 from the left along the foil progression direction and descends to -θ2, centered on the center of the longitudinal direction, which is the foil progression direction.

Of course, as mentioned above, if the angle of inclination goes beyond this range, unfavorable results in the orientation characteristics may be derived.

In the illustrated embodiment, referring to FIG. 11, a magnetic field density distribution is similarly formed along the magnet line.

Referring to FIGS. 12 to 14, the intensity of the magnetic field was measured along the A and B directions shown in FIG. 11, and it also changed depending on the arrangement of the magnets. The maximum value was 0.76, the minimum value was 0.60, and as a result, the magnetic field unevenness was 12%.

In the illustrated embodiment, referring to FIGS. 15 to 17, the current density distribution of the scanned foil (1) is illustrated, which has a similar shape along a plurality of magnet lines, and referring to FIG. 17, the resulting force value due to the eddy current is 42 N, which is not good.

Referring to FIG. 18, a plan view of a magnetic body assembly (130) of a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated, and referring to FIG. 19, a magnetic field density distribution of a magnetic body assembly of a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated, and referring to FIG. 20, a magnetic field graph along the A direction of a magnetic body assembly of a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated, and referring to FIG. 21, a magnetic field graph along the B direction of a magnetic body assembly of a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated, and referring to FIG. 22, a magnetic field graph of a magnetic body assembly of a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated. An average magnetic field graph is illustrated, and with reference to FIG. 23, a current density distribution of a foil oriented in a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated, and with reference to FIG. 24, a current vector distribution of a foil oriented in a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated, and with reference to FIG. 25, a force intensity graph due to an eddy current of a foil oriented in a double zigzag array type in an orientation device according to a third embodiment of the present invention is illustrated.

In the illustrated embodiment, referring to FIG. 18, the width direction based on the drawing can be divided into a left magnet line and a right magnet line based on the center, and a space (134) is formed between them. In addition, the magnets are arranged so that each of the left and right magnet lines forms a stage. That is, the pixel magnets are arranged so that half are N poles or S poles, and half are H poles (N, S poles lie horizontally). In addition, the left magnet line and the right magnet line are arranged at different heights, and for this reason, they are described as a double zigzag.

At this time, in FIG. 18, the width of the left magnet assembly and the width of the right magnet assembly are set to be the same, and the spacing between the left and right magnet assemblies may be appropriately set within a range of 3 to 10% of the width of the left or right magnet assembly.

In addition, a central separation space (134) is formed, and if there is no separation space, the characteristic may be a very high eddy current.

In the illustrated embodiment, referring to FIG. 19, a magnetic field density distribution is similarly formed along the magnet line.

Referring to FIGS. 20 to 22, the intensity of the magnetic field was measured along the A and B directions shown in FIG. 19, and it also changed depending on the arrangement of the magnets. The maximum value was 0.62, the minimum value was 0.55, and as a result, the magnetic field unevenness was 5.6%.

In the illustrated embodiment, referring to FIGS. 23 to 25, the current density distribution of the scanned foil (1) is illustrated, which has a similar shape along a plurality of magnet lines, and referring to FIG. 25, the resulting force value due to the eddy current is 25 N, which is good.

Referring to FIG. 26, a plan view of a magnetic body assembly (140) of a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated. Referring to FIG. 27, a magnetic field density distribution of a magnetic body assembly of a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated. Referring to FIG. 28, a magnetic field graph along the A direction of a magnetic body assembly of a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated. Referring to FIG. 29, a magnetic field graph along the B direction of a magnetic body assembly of a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated. Referring to FIG. 30, an average magnetic field graph of a magnetic body assembly of a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated. Referring to FIG. 31, a current density distribution of a foil oriented in a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated. Referring to FIG. 32, a current vector distribution diagram of a foil oriented in a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated. Referring to FIG. 33, a force intensity graph due to an eddy current of a foil oriented in a QS array type in an orientation device according to a fourth embodiment of the present invention is illustrated.

In the illustrated embodiment, referring to Fig. 26, the magnet lines are arranged in a W-shaped wave shape along the width direction based on the drawing. This shape can be viewed as the rib shape of the first embodiment extended along the foil progression direction. In other words, it is an arrangement shape in which the V-shaped shape is extended not once but multiple times, and accordingly, it can be guessed in advance that the uniformity can be improved.

At this time, the QS array type illustrated in Fig. 26 is formed with θ3 of 17 degrees to 37 degrees. That is, pixel magnets are arranged with a descending slope, an ascending slope, a descending slope again, and an ascending slope along the foil travel direction to form a W-shaped wave shape.

In the illustrated embodiment, referring to FIG. 27, a magnetic field density distribution is similarly formed along the magnet line.

Referring to FIGS. 28 to 30, the intensity of the magnetic field was measured along the A and B directions shown in FIG. 27, and it also changed depending on the arrangement of the magnets. The maximum value was 0.58, the minimum value was 0.54, and as a result, the magnetic field unevenness had the lowest value of 3.7%.

In the illustrated embodiment, referring to FIGS. 31 to 33, the current density distribution of the scanned foil (1) is illustrated, which has a similar shape along a plurality of magnet lines, and referring to FIG. 33, the resulting force value due to the eddy current is 24 N, which is good.

Referring to FIG. 34, a graph is shown that displays the average magnetic fields of each embodiment according to the present invention.

As shown, the results show that the Halbach vertical arrangement is significantly worse than other examples, and the remaining examples are within a certain range.

Referring again to Table 1, the rib arrangement of the first embodiment and the V-array of the second embodiment both showed higher eddy current intensity and nonuniformity by more than 10% than the third and fourth embodiments, so it would be reasonable to apply a double zigzag arrangement or a QS arrangement. In particular, it can be seen that the QS arrangement according to the fourth embodiment shows the best characteristics in both eddy current intensity and uniformity.

Although the embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same spirit, but this will also be considered to fall within the spirit of the present invention.

The present invention can be applied to orientate particles of a negative electrode active material applied to a foil in a secondary battery so as to have directionality.

Claims

An alignment device comprising a plate-shaped magnetic assembly arranged in a pair and orienting a negative active material applied to a foil passing therebetween,

The above magnetic assembly is formed by arranging a plurality of magnet lines in a row along the width direction, which is the direction in which the foil advances on a plane, and extending a plurality of magnet lines adjacent to each other along the length direction.

The above multiple magnet lines are arranged repeatedly in the order of Halbach array line, S pole array line, Halbach array line, and N pole array line,

The above multiple magnet lines are arranged so as to have an inclination with respect to the width direction.

Orientation device.
In the first paragraph,

The above plurality of magnet lines have a wave shape along the width direction,

Orientation device.
In the second paragraph,

The above multiple magnet lines are formed by being inclined in different directions at least twice.

Orientation device.
In the first paragraph,

The above plurality of magnet lines have first and second inclinations which are in opposite directions,

Orientation device.
In the first paragraph,

The above inclination has an angle range of 12 degrees to 32 degrees or an angle range of 17 degrees to 37 degrees with respect to the direction of foil travel.

Orientation device.
In the first paragraph,

The inclination of the above plurality of magnet lines in the width direction is determined by moving half the width of the adjacent pixel magnets along the width direction.

Orientation device.
In the first paragraph,

The above magnetic assembly is formed by arranging the pixel magnets in a single layer.

Orientation device.
In the first paragraph,

The above pixel magnets are in the shape of a rectangular solid.

Orientation device.
An alignment device comprising a plate-shaped magnetic assembly arranged in a pair and orienting a negative active material applied to a foil passing therebetween,

The above magnetic assembly is formed by a plurality of magnet lines in which pixel magnets are arranged in a single row along the width direction, which is the direction in which the foil advances on a plane, and extending adjacently along the length direction.

The above multiple magnet lines are arranged repeatedly in the order of Halbach array line, S pole array line, Halbach array line, and N pole array line,

The above multiple magnet lines are arranged so that at least one step is formed in the width direction and the up-down direction.

Orientation device.
In Article 9,

The above magnetic assembly has a spaced line formed along the length direction in which no magnets are arranged.

Orientation device.