Coating die head and coating device

Abstract

The utility model provides a coating die head and a coating device, the coating die head comprises an upper die head and a lower die head, and the upper die head is connected with the lower die head; the first column of vibrating pieces and the second column of vibrating pieces are adjacently arranged, the first column of vibrating pieces comprise at least one first vibrating piece, and the second column of vibrating pieces comprise at least one second vibrating piece; the first distribution cavity and the second distribution cavity are located between the upper die head and the lower die head, the first distribution cavity and the second distribution cavity are adjacently arranged, the second distribution cavity is closer to a lip of the coating die head, each first vibration piece penetrates through the upper die head and extends into the first distribution cavity, and each second vibration piece penetrates through the upper die head and extends into the second distribution cavity. According to the coating die head, the position of the vibration part is reasonably arranged, so that the consistency of power received by slurry at different positions in the distribution cavity is improved, the flowability of the slurry at each position in the distribution cavity is the same or similar, and the improvement is beneficial to improving the coating quality of a pole piece.

Description

Technical Field

[0001] The present application mainly relates to the coating of lithium batteries, and in particular to a coating die and a coating device. Background Art

[0002] The coating process is a critical step in the manufacture of lithium-ion batteries. The quality of the coated pole piece will directly affect important performance indicators such as battery performance consistency, cycle life and safety. Improving the coating quality of the pole piece is one of the important methods to improve the quality of the pole piece. Utility Model Content

[0003] The technical problem to be solved by the present application is to provide a coating die head and a coating device, which can improve the coating quality of the pole piece.

[0004] In order to solve the above technical problems, the present application provides a coating die, including: an upper die and a lower die, the upper die is connected to the lower die; a first column of vibrators and a second column of vibrators, the first column of vibrators and the second column of vibrators are arranged adjacent to each other, the first column of vibrators includes at least one first vibrator, and the second column of vibrators includes at least one second vibrator; a first distribution chamber and a second distribution chamber, located between the upper die and the lower die, the first distribution chamber and the second distribution chamber are arranged adjacent to each other, and the second distribution chamber is closer to the lip of the coating die, wherein each of the first vibrators passes through the upper die and extends into the first distribution chamber, and each of the second vibrators passes through the upper die and extends into the second distribution chamber.

[0005] In an embodiment of the present application, the first column of vibration elements includes a plurality of first vibration elements arranged at intervals, and the second column of vibration elements includes a plurality of second vibration elements arranged at intervals.

[0006] In an embodiment of the present application, each of the first vibration members extends in a vertical direction.

[0007] In an embodiment of the present application, each of the first vibrating members is aligned with an axis of the first distribution chamber.

[0008] In an embodiment of the present application, a distance between two adjacent first vibrating members is equal to a width of the first distribution chamber.

[0009] In an embodiment of the present application, one end of each of the second vibrating members extending into the second distribution chamber is inclined toward the lip.

[0010] In one embodiment of the present application, both the first vibrator and the second vibrator are ultrasonic probes, wherein the length of the portion of the first vibrator located in the first distribution chamber is 0.5 to 5 mm, and the length of the portion of the second vibrator located in the second distribution chamber is 0.5 to 5 mm.

[0011] In an embodiment of the present application, the first vibrating members are respectively disposed at two ends of the first distribution chamber in its extension direction.

[0012] In an embodiment of the present application, the second vibrating members are respectively disposed at two ends of the second distribution chamber in its extension direction.

[0013] On the other hand, the present application also proposes a coating device, including: the coating die head as described above.

[0014] The coating die head of the present application arranges the position of the vibrating element reasonably, thereby improving the consistency of the power received by the slurry at different positions in the distribution chamber, and making the fluidity of the slurry at various positions in the distribution chamber the same or close, which helps to improve the coating quality of the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0016] Figure 1 is a top view of a coating die head in one embodiment of the present application;

[0017] Figure 2 yes Figure 1 Schematic cross-sectional view of the coating die along line AA.

[0018] Reference numerals

[0019] Upper die head 110 Second vibrating member 141

[0020] Lower die head 120 Second vibrating member 142

[0021] The first row of vibrating elements 130 and the second row of vibrating elements 143

[0022] First vibrating member 131 First distribution chamber 150

[0023] First vibrating member 132 Second distribution chamber 160

[0024] First vibrating member 133 Coating slit 170

[0025] Second row of vibrating elements 140 lip 180 DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0027] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0029] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0032] Next, the coating die head of the present application is described by way of examples.

[0033] refer to Figure 1 A top view of a coating die in one embodiment is shown, and Figure 2 shown Figure 1 A schematic cross-sectional view of the coating die head along line AA. Figure 1 and Figure 2 In the embodiment of the present invention, the coating die includes an upper die 110 , a lower die 120 , a first row of vibrating members 130 , a second row of vibrating members 140 , a first distribution chamber 150 , and a second distribution chamber 160 .

[0034] Specifically, the upper die head 110 and the lower die head 120 both extend along the second direction D2, the upper die head 110 is located above the lower die head 120 in the third direction D3, and the two are connected to each other. The present application does not limit the connection method between the upper die head 110 and the lower die head 120. Preferably, the connection method between the two is a detachable connection (such as bolting), which is convenient for subsequent disassembly and maintenance.

[0035] A coating slit 170 is formed between the upper die 110 and the lower die 120. The upper die 110 and the lower die 120 together form a lip 180 of the coating die. The slurry can move from left to right along the coating slit 170 and finally be extruded from the lip 180.

[0036] The first column of vibrators 130 and the second column of vibrators 140 are arranged adjacent to each other in the first direction D1. The first column of vibrators 130 includes three first vibrators arranged at intervals in the second direction D2: a first vibrator 131, a first vibrator 132, and a first vibrator 133. Similarly, the second column of vibrators 140 includes three second vibrators arranged at intervals in the second direction D2: a second vibrator 141, a second vibrator 142, and a second vibrator 143. The distance between adjacent first vibrators can be adjusted as required. For example, the distance between the intervals can be increased, which can save the cost of the first vibrators. For another example, the distance between the intervals can be reduced, which can increase the total power of the first vibrators, thereby better breaking up the agglomerated particles in the slurry and preventing the dry slurry from accumulating in the distribution chamber, thereby improving the coating quality of the pole piece. The above description also applies to the second vibrator.

[0037] It should be noted that the number of the first vibrating elements in the first row of vibrating elements 130 is not limited to Figure 1 and Figure 2 The three in the embodiment can be set according to the requirements. For example, the first column of vibrators 130 can have only one first vibrator; for another example, the number of first vibrators in the first column of vibrators 130 can increase as the size of the first distribution cavity 150 in the second direction D2 increases. The above description also applies to the second column of vibrators 140.

[0038] The first distribution cavity 150 and the second distribution cavity 160 are located between the upper die 110 and the lower die 120 in the third direction D3, and are arranged adjacent to each other in the first direction D1, and the second distribution cavity 160 is closer to the lip 180 of the coating die in the first direction D1. During coating, the slurry in the first distribution cavity 150 and the slurry in the second distribution cavity 160 can enter the coating slit 170, and the slurry entering the coating slit 170 moves from left to right along the coating slit 170 and is finally extruded from the lip 180.

[0039] Each first vibrating member penetrates the upper die 110 and extends into the first distribution cavity 150, and each second vibrating member penetrates the upper die 110 and extends into the second distribution cavity 160. Figure 2As shown, a specific description is given by taking the first vibrating member 132 and the second vibrating member 142 as an example. The first vibrating member 132 extends in the vertical direction (i.e., the third direction D3), and one end located at the bottom extends into the interior of the first distribution chamber 150. The first vibrating member 132 can apply vibration to the slurry in the first distribution chamber 150, thereby breaking up the agglomerated particles in the slurry and preventing the dry slurry from accumulating in the first distribution chamber 150.

[0040] In one embodiment, the first vibrating member 132 may be an ultrasonic probe, and the length of the portion of the first vibrating member 132 located in the first dispensing chamber 150 may be 0.5-5 mm, for example, 1 mm, 2 mm, 3 mm or 4 mm.

[0041] exist Figure 2 In the embodiment, the cross-section of the first distribution chamber 150 is elliptical, and in some other embodiments, the cross-section of the first distribution chamber 150 may be circular. Each first vibrating member may be aligned with the axis of the first distribution chamber 150, or in other words, the first vibrating member extends in the vertical direction and intersects with the axis of the first distribution chamber 150.

[0042] Combined with reference Figure 1 and Figure 2 As described above, the spacing between two adjacent first vibrators is equal to the width of the first distribution chamber. Specifically, the first vibrator 131 and the second vibrator 132 are spaced apart by a distance Δ1 in the second direction D2, the first vibrator 132 and the second vibrator 133 are spaced apart by a distance Δ2 in the second direction D2, the first distribution chamber 150 has a width W1 in the first direction D1, and the distance Δ1 and the distance Δ2 are both equal to the width W1. The distance Δ1 and the distance Δ2 are both equal to the width W1, which can make the power received by the slurry at different positions in the first distribution chamber 150 more uniform, or in other words, make the power received by the slurry distributed in the first direction D1 in the first distribution chamber 150 the same or close to the power received by the slurry distributed in the second direction D2. This is because the size of the action of a single first vibrator in the first direction D1 is the same as the size of the action in the second direction D2, both equal to the width W1.

[0043] The end 142a of the second vibrating member 142 extends into the second distribution chamber 160. The second vibrating member 142 can apply vibration to the slurry in the second distribution chamber 160, thereby breaking up the agglomerated particles in the slurry and preventing the dry slurry from accumulating in the second distribution chamber 160. The second vibrating member 142 can be an ultrasonic probe, and the length of the portion of the second vibrating member 142 located in the second distribution chamber 160 can be 0.5 to 5 mm, for example, 1 mm, 2 mm, 3 mm or 4 mm.

[0044] In one embodiment, the end 142 a of the second vibrator 142 is inclined toward the lip 180 , so as to apply ultrasonic waves to the intersection of the second chamber 160 and the coating slit 170 to prevent the slurry from blocking the intersection of the second chamber 160 and the coating slit 170 .

[0045] exist Figure 1 and Figure 2 In the embodiment of the present invention, the cross-sectional area of ​​the first distribution chamber 150 is greater than the cross-sectional area of ​​the second distribution chamber 160. This is because the slurry entering the second distribution chamber 160 has been vibrated by the first vibrator in the first distribution chamber 150. When the power of the first vibrator is the same as that of the second vibrator, if the cross-sectional area of ​​the first distribution chamber 150 is kept the same as that of the second distribution chamber 160, it is difficult to further break up the agglomerated particles in the slurry. Reducing the cross-sectional area of ​​the second distribution chamber 160 can make the power released by the second vibrator concentrated in a small space, which makes the vibration applied by the second vibrator to the slurry in the second distribution chamber 160 more intense, so that the agglomerated particles in the slurry can be further broken up.

[0046] Combination Figure 1 and Figure 2 As shown, the first distribution chamber 150 extends along the second direction D2. According to the different slurry flow speeds in the first distribution chamber 150, the first distribution chamber 150 can be divided into a slurry retention zone and a slurry flow zone. In the second direction D2, the flow speed of the slurry in the middle part of the first distribution chamber 150 is faster, and the flow speed of the slurry in the first distribution chambers 150 at both ends is slower. Therefore, the slurry flow zone corresponds to the first distribution chamber 150 in the middle part, and the slurry retention zone corresponds to the first distribution chamber 150 at both ends. Compared with the slurry flow zone, the slurry in the slurry retention zone needs the action of the first vibrator more. Therefore, in one embodiment, the first vibrator is respectively provided at both ends of the first distribution chamber 150. In this way, the fluidity of the slurry in the slurry retention zone can be improved, and then the fluidity of the slurry at each position in the first distribution chamber is made the same or close, which helps to improve the coating quality of the pole piece.

[0047] Similarly, the second distribution chamber 160 also has a slurry retention area and a slurry flow area. In some embodiments, second vibrating members are respectively disposed at both ends of the second distribution chamber 160.

[0048] On the other hand, the present application further provides a coating device, which includes the coating die head as described above.

[0049] In order to more clearly understand the coating die of the present application, a non-limiting example and comparative example are given here.

[0050] The above example is based on the coating die head of the present application to perform the following coating process steps:

[0051] Step 1: Prepare slurry. The solid content of the slurry is 51%-52%, the viscosity is 5000-8000mPa·s, and the fineness is within 30um.

[0052] Step 2: Use the coating die of the present application to coat the slurry prepared in step 1 on the electrode. The vibrating element in the coating die used in step 2 is an ultrasonic probe, the number of ultrasonic probes is 6, and the coating speed is 10 m / min.

[0053] Step 3: Debug the pole piece surface density to make it qualified, and record the extreme difference of the first piece's lateral surface density.

[0054] Step 4: Record the number of scratches and pits within 500m of the coating process.

[0055] Step 5: Take a sample and weigh it 5 hours after coating, and record the extreme difference in transverse weight.

[0056] The comparative example comprises the following steps:

[0057] Step 1: Prepare slurry. The solid content of the slurry is 51%-52%, the viscosity is 5000-8000mPa·s, and the fineness is within 30um.

[0058] Step 2: Use a coating die head in the prior art to coat the slurry prepared in step 1 on the electrode at a coating speed of 10 m / min.

[0059] Step 3: Debug the pole piece surface density to make it qualified, and record the extreme difference of the first piece's lateral surface density.

[0060] Step 4: Record the number of scratches and pits within 500m of the coating process.

[0061] Step 5: Take a sample and weigh it 5 hours after coating, and record the extreme difference in transverse weight.

[0062] Refer to Table 1 below, which records the various indicators recorded in the examples of this application and the comparative examples. As shown in Table 1, the number of scratches, the number of pits, the extreme difference in the first transverse surface density, and the extreme difference in the transverse weight after 5 hours in the examples of this application are all smaller than those in the comparative examples, which indicates that coating the pole piece using the coating die head of this application can improve the coating quality of the pole piece.

[0063] Table 1. Various indicators recorded in the examples and comparative examples of this application

[0064] Various indicators Comparative Example This application example Number of scratches 13 3 Number of pits 52 14 The first piece has extremely poor lateral surface density <![CDATA[0.85g / m 2 ]]> <![CDATA[0.64g / m 2 ]]> After 5 hours, the horizontal weight is very poor <![CDATA[1.85g / m 2 ]]> <![CDATA[1.25g / m 2 ]]>

[0065] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0066] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0067] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0068] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0069] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A coating die head, characterized in that: include: An upper die head and a lower die head, wherein the upper die head is connected to the lower die head; A first column of vibration elements and a second column of vibration elements, wherein the first column of vibration elements is arranged adjacent to the second column of vibration elements, the first column of vibration elements includes at least one first vibration element, and the second column of vibration elements includes at least one second vibration element; The first distribution chamber and the second distribution chamber are located between the upper die head and the lower die head, the first distribution chamber and the second distribution chamber are arranged adjacent to each other, and the second distribution chamber is closer to the lip of the coating die head, wherein each of the first vibrating members passes through the upper die head and extends into the first distribution chamber, and each of the second vibrating members passes through the upper die head and extends into the second distribution chamber.

2. The coating die head according to claim 1, characterized in that The first column of vibration elements includes a plurality of first vibration elements arranged at intervals, and the second column of vibration elements includes a plurality of second vibration elements arranged at intervals.

3. The coating die head according to claim 1, characterized in that Each of the first vibration members extends in a vertical direction.

4. The coating die head according to claim 3, characterized in that Each of the first vibrating members is aligned with the axis of the first dispensing chamber.

5. The coating die head according to claim 3, characterized in that: The distance between two adjacent first vibrating members is equal to the width of the first distribution chamber.

6. The coating die head according to claim 1, characterized in that One end of each of the second vibrating members extending into the second distribution chamber is inclined toward the lip.

7. The coating die head according to claim 1, characterized in that The first vibrator and the second vibrator are both ultrasonic probes, wherein the length of the portion of the first vibrator located in the first distribution cavity is 0.5-5 mm, and the length of the portion of the second vibrator located in the second distribution cavity is 0.5-5 mm.

8. The coating die head according to claim 1, characterized in that The first vibrating members are respectively disposed at two ends of the first distribution chamber in its extending direction.

9. The coating die head according to claim 1, characterized in that: The second vibrating members are respectively disposed at two ends of the second distribution chamber in its extending direction.

10. A coating device, characterized in that: include: A coating die as claimed in any one of claims 1 to 9.

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