CN116809326A - Coating die and coating process - Google Patents

Abstract

The application discloses a coating die head and a coating process, wherein the die head body, a first gasket and a second gasket are arranged at intervals, and the die head body is provided with a first discharging chamber and a second discharging chamber which are respectively positioned in the first discharging chamber and the second discharging chamber; the first gasket is provided with a plurality of first flow passages which are arranged at intervals, and the second gasket is provided with a second flow passage; the application also discloses a coating process. The first gasket realizes the effect of interval coating through a plurality of first flow channels, the second gasket realizes the effect of whole-piece region coating through a second flow channel, and then a discontinuous coating region and a covering coating region are formed, the discontinuous coating region and the covering coating region are jointed on a substrate to finish local coating, and the coating is carried out in the mode; the interval formed by the interval coating areas is a rectangular slot, so that the subsequent laser cleaning process can be omitted, and the production efficiency of products, the qualification rate of the products and the quality of the products are greatly improved.

Description

Coating die and coating process

Technical field

The present invention relates to the field of coating technology, and specifically to a coating die and a coating process.

Background technique

The pole pieces of lithium-ion batteries need to be coated by coating equipment first, and then cut and shaped. After coating, the pole pieces also need to open rectangular slots. At present, laser cleaning is mainly used to clean the pole pieces. Rectangular slots are cleaned on the coating area, and the rectangular slots will serve as tabs, and are finally die-cut to form the finished product. Since rectangular slots cannot be formed in the initial coating stage, a laser cleaning process needs to be added later, which not only affects production efficiency, but also has problems with cleaning residue and cleaning size in the laser cleaning process, which directly affects the qualification rate and quality of the product.

Contents of the invention

In view of the shortcomings of the existing technology, the present invention provides a coating die and a coating process.

The invention discloses a coating die, which includes: a die body, a first gasket and a second gasket. The die body has a first discharge chamber and a second discharge chamber arranged at intervals. The first gasket and the second gasket are respectively located in the first discharge chamber and the second discharge chamber; the first gasket has a plurality of first flow channels arranged at intervals, and the second gasket has a second flow channel;

The slurry flowing out of the plurality of first flow channels forms an intermittent coating area, the slurry flowing out of the second flow channels forms a covering coating area, and the intermittent coating area and the covering coating area are connected.

According to an embodiment of the present invention, the die head body includes an upper mold, a middle mold and a lower mold. The upper mold, the middle mold and the lower mold are connected in sequence. The first gasket is located between the upper mold and the middle mold. The second gasket Located between the middle mold and the lower mold.

According to an embodiment of the present invention, the first gasket includes a first horizontal plate, two first bending plates and a plurality of barrier plates. The two first bending plates are respectively connected to two ends of the first horizontal plate, and a plurality of The barrier plates are spaced apart on the first horizontal plate, and a plurality of barrier plates are located between the two first bending plates. The interval between the first bending plate and the barrier plate forms a first flow channel, and the space between the two barrier plates is The space also forms a first flow channel.

According to an embodiment of the present invention, the second gasket includes a second horizontal plate and two second bending plates. The two second bending plates are respectively connected to both ends of the second horizontal plate. The two second bending plates The space between the plates forms a second flow channel.

The invention discloses a coating process including:

The slurry in the second discharge chamber flows into the second gasket, and the slurry flows to the base material through the second flow channel of the second gasket, forming a covering coating area on the base material, and the slurry stops flowing in after coating;

The slurry in the first discharge chamber flows into the first gasket, and the slurry flows to the substrate through the plurality of first flow channels of the first gasket. An intermittent coating area is formed immediately after covering the coating area. After coating, the slurry stops flowing in. ;

Continuously form overlay and intermittent coating areas that are staggered and joined together.

According to an embodiment of the present invention, after the covering coating area is formed, the slurry is delayed for T ₁ second before stopping the flow.

According to an embodiment of the present invention, T ₁ =3ms.

According to an embodiment of the present invention, the time when the slurry in the second discharge chamber flows into the second gasket again is T ₂ seconds earlier than the time when the slurry in the first discharge chamber stops flowing.

According to an embodiment of the present invention, T ₂ =3ms.

The invention discloses a coating process including:

The slurry in the second discharge chamber flows into the second gasket, and the slurry flows to the base material through the second flow channel of the second gasket, forming a covering coating area on the base material, and the slurry stops flowing in after coating;

The slurry in the first discharge chamber flows into the first gasket, and the slurry flows to the substrate through the plurality of first flow channels of the first gasket. An intermittent coating area is formed immediately after covering the coating area. After coating, the slurry stops flowing in. ;

The slurry in the second discharge chamber flows into the second gasket again. The slurry flows to the substrate through the second flow channel of the second gasket. A covering coating area is formed immediately after the discontinuous coating area. After coating, the slurry stops flowing in. ;

After a certain distance, apply the covering coating area-intermittent coating area-covering coating area again.

The beneficial effect of the present invention is that a first gasket and a second gasket are provided on the die body. The first gasket achieves the effect of spaced coating through a plurality of first flow channels, and the second gasket realizes the overall coating effect through the second flow channels. The effect of partial area coating is achieved, thereby forming an intermittent coating area and a covering coating area. Join the intermittent coating area and the covering coating area on the substrate to complete the partial coating. Subsequent coating only needs to be carried out in the above manner; interval The intervals formed by the coating area are rectangular slots, which eliminates the need for subsequent laser cleaning processes and greatly improves product production efficiency, product qualification rate, and product quality.

Description of the drawings

The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the attached picture:

Figure 1 is a schematic diagram of the three-dimensional structure of the coating die;

Figure 2 is another three-dimensional structural diagram of the coating die;

Figure 3 is a schematic diagram of the three-dimensional structure of the upper mold;

Figure 4 is a schematic diagram of the three-dimensional structure of the lower mold;

Figure 5 is a schematic three-dimensional structural diagram of the first gasket;

Figure 6 is a schematic three-dimensional structural diagram of the second gasket;

Figure 7 is a schematic diagram of the continuous coating effect;

Figure 8 is a flow chart of the coating process;

Figure 9 is a schematic diagram of the gap coating effect;

Figure 10 is a flow chart of another coating process.

Explanation of reference signs

1-die head body; 11-first discharge chamber; 12-second discharge chamber; 13-upper mold; 131-upper feed port; 14-middle mold; 15-lower mold; 151-lower feed port ;16-upper control valve; 17-lower control valve;

2-the first gasket; 21-the first flow channel; 22-the first horizontal plate; 23-the first bending plate; 24-baffle plate;

3-The second gasket; 31-The second flow channel; 32-The second horizontal plate; 33-The second bending plate.

Detailed ways

The following will disclose multiple embodiments of the present invention in the drawings. For clarity of explanation, many practical details will be explained in the following description. However, it will be understood that these practical details should not limit the invention. That is to say, in some embodiments of the invention, these practical details are not necessary. In addition, in order to simplify the drawings, some commonly used structures and components will be shown in the drawings in a simple schematic manner.

In addition, descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes and do not specifically refer to the order or order, nor are they used to limit the present invention. They are only used to distinguish between the following. The same technical terms describe only components or operations, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions in various embodiments can be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist. , nor within the protection scope required by the present invention.

Embodiment 1

As shown in Figures 1-2, Figure 1 is a schematic three-dimensional structural view of the coating die; Figure 2 is another three-dimensional structural schematic view of the coating die. The coating die of the present application includes a die body 1, a first gasket 2 and a second gasket 3. The first gasket 2 and the second gasket 3 are both arranged on the die body 1, and the slurry flows into the die. The body 1 then flows out onto the substrate through the first gasket 2 and the second gasket 3 to achieve coating of the substrate.

Referring again to FIGS. 3 and 4 , FIG. 3 is a schematic three-dimensional structural diagram of the upper mold 13 ; FIG. 4 is a schematic three-dimensional structural diagram of the lower mold 15 . The die head body 1 includes an upper mold 13, a middle mold 14 and a lower mold 15. The upper mold 13, the middle mold 14 and the lower mold 15 are connected in sequence, and both the upper mold 13 and the lower mold 15 can rotate relative to the middle mold 14, that is, the upper mold 13, the middle mold 14 and the lower mold 15 are connected in sequence. After the mold 13, the middle mold 14 and the lower mold 15 are combined, there are two states, which are the closed state and the open state respectively; the upper mold 13 and the middle mold 14 together form the first discharge chamber 11, and the first gasket 2 is located in the first discharging chamber 11. In the discharge chamber 11; the lower mold 15 and the middle mold 14 together form the second discharge chamber 12, and the second gasket 3 is located in the second discharge chamber 12; in the closed state, the upper mold 13 and the middle mold 14 clamp the second discharge chamber 12. A gasket 2, the lower mold 15 and the middle mold 14 clamp the second gasket 3. In specific applications, the upper mold 13 has an upper feed port 131, which is connected with the first discharge chamber 11. The slurry enters the first discharge chamber 11 through the upper feed port 131, and then passes through the first pad. The sheet 2 then flows out to the surface of the base material; similarly, the lower mold 15 has a lower feed port 151, which is connected with the second discharge chamber 12, and the slurry enters the second discharge chamber through the lower feed port 151 The chamber 12 flows out to the surface of the substrate after passing through the second gasket 3 to achieve coating. Furthermore, the die body 1 also includes an upper control valve 16 and a lower control valve 17. The upper control valve 16 is connected to the upper feed port 131 through a pipeline, and the slurry flowing out of the upper feed port 131 is controlled through the upper control valve 16. , similarly, the slurry flowing out of the lower feed port 151 is controlled through the lower control valve 17, that is, when the upper control valve 16 is opened, the slurry will flow from the upper feed port 131 to the first discharge chamber 11. At this time , the substrate will be coated with the slurry flowing out of the first gasket 2; when the lower control valve 17 is opened, the slurry will flow into the first discharge chamber 11 from the lower feed port 151, and at this time, the slurry will flow from the second gasket 3. The outflowing slurry coats the substrate.

Referring again to FIGS. 5 and 6 , FIG. 5 is a schematic three-dimensional structural diagram of the first gasket 2 ; FIG. 6 is a schematic three-dimensional structural diagram of the second gasket 3 . The first gasket 2 includes a first horizontal plate 22, two first bending plates 23 and a plurality of blocking plates 24. The two first bending plates 23 are respectively connected to both ends of the first horizontal plate 22, and a plurality of The barrier plates 24 are distributed between the two first bending plates 23. At the same time, a plurality of barrier plates 24 are spacedly connected to the first transverse plate 22 in the same direction. There is a gap between the first bending plates 23 and the barrier plates 24, and This spacing forms a first flow channel 21. In addition, there is also a spacing between two adjacent barrier plates 24, and this spacing also forms a first flow channel 21. The slurry flows out from the first flow channel 21 to the surface of the substrate. Through the arrangement of the barrier plate 24, the entire first gasket 2 forms a plurality of first flow channels 21, and blank areas, that is, rectangular slots, are formed between the plurality of first flow channels 21. The second gasket 3 includes a second horizontal plate 32 and two second bending plates 33 . The two second bending plates 33 are respectively located at both ends of the second horizontal plate 32 . The spacing between them forms a second flow channel 31, and the slurry will also flow to the surface of the substrate from the second flow channel 31.

In specific applications, the slurry flows from the upper discharge port into the first discharge chamber 11, and then flows to the substrate through a plurality of first flow channels 21. At this time, an intermittent coating area is formed on the surface of the substrate; on the other hand, the slurry It flows from the lower discharge port to the second discharge chamber 12, and then flows to the substrate through the second flow channel 31. At this time, a covering coating area is formed on the surface of the substrate. When the discontinuous coating area and the covering coating area are joined, the completion The coating area of the base material part is determined. In actual use, the discontinuous coating area and the covering coating area can be appropriately combined according to the needs.

To sum up, the die body 1 is provided with a first gasket 2 and a second gasket 3. The first gasket 2 achieves the effect of spaced coating through a plurality of first flow channels 21, and the second gasket 3 passes through the second flow channel 21. The flow channel 31 achieves the effect of coating the entire area, thereby forming an intermittent coating area and a covering coating area. The intermittent coating area and the covering coating area are joined on the substrate to complete local coating. Subsequent coating only needs to be carried out in the above manner. Just cover it; the intervals formed by the spaced coating areas are rectangular slots, which eliminates the need for subsequent laser cleaning processes and greatly improves product production efficiency, product qualification rate, and product quality.

Embodiment 2

Referring to Figures 7 and 8, Figure 7 is a schematic diagram of the continuous coating effect; Figure 8 is a flow chart of the coating process. What this embodiment aims to achieve is the effect of continuous coating, and the coating die in Embodiment 1 is used to coat the substrate. The coating process of this embodiment includes:

Open the lower control valve 17 so that the slurry flows through the upper discharge port and then flows into the second discharge chamber 12. The slurry in the second discharge chamber 12 will flow from the second flow channel 31 to the substrate. At this time, on the substrate A covering coating area P ₁ is formed on the upper surface. When the coating reaches the designated position, the lower control valve 17 is closed, and the second flow channel 31 stops flowing slurry to the surface of the substrate;

Open the upper control valve 16, and the slurry flows from the upper discharge port into the first discharge chamber 11, and then flows to the substrate through a plurality of first flow channels 21, forming an intermittent coating area P ₂ on the substrate. When coating to After the designated position, the upper control valve 16 is closed. At this time, the first flow channel 21 will no longer flow slurry to the surface of the substrate, and the intermittent coating area P ₂ is coated immediately behind the covering coating area P ₁ , so the two are joined;

Subsequent parts will continue to form staggered and joined covering coating areas P ₁ and intermittent coating areas P ₂ according to the above steps.

Furthermore, if there is a gap at the joint between the covering coating area P ₁ and the intermittent coating area P ₂ , the substrate will have uneven coating problems, which will affect the use of the final battery and reduce the quality of the battery; in order to avoid the intermittent coating area There is a gap at the joint between P ₂ and the covering paint area P _1. When the covering paint area P ₁ is formed, the upper control valve 16 will open, and the lower control valve 17 will close with a delay of T ₁ second, that is, the second flow channel 31 flows out to the base. The slurry area on the surface of the material is larger than the covering coating area P ₁ , and the extra coating slurry area just makes up for the lag problem between opening the upper control valve 16 and the outflow of the slurry from the first flow channel 21 . In this embodiment, T ₁ =3ms.

Furthermore, in order to avoid gaps between the covered coating area P ₁ and the intermittent coating area P ₂ , when the intermittent coating area P ₂ is about to be coated, the lower control valve 17 is opened T ₂ seconds in advance to allow the slurry to flow in again. to the second discharging chamber 12, specifically, T ₂ =3ms.

Through the above coating process, multiple staggered covering coating areas P ₁ and intermittent coating areas P ₂ are formed on the entire substrate surface, and the covering coating areas P ₁ and intermittent coating areas P ₂ achieve better joining.

In summary, the above-mentioned coating process will form a rectangular slot S during the coating process. There is no need for laser cleaning in the post-processing. It only needs to be die-cut according to the needs, which greatly improves the production efficiency and avoids the need for laser cleaning. Battery quality problems caused by cleaning.

Embodiment 3

As shown in Figures 9 and 10, Figure 9 is a schematic diagram of the gap coating effect; Figure 10 is a flow chart of another coating process. What this embodiment aims to achieve is the effect of gap coating, and the coating die in Embodiment 1 is used to coat the substrate. The coating process of this embodiment includes:

Open the lower control valve 17 so that the slurry flows through the upper discharge port and then flows into the second discharge chamber 12. The slurry in the second discharge chamber 12 will flow from the second flow channel 31 to the substrate. At this time, on the substrate A covering coating area P ₁ is formed on the upper surface. When the coating reaches the designated position, the lower control valve 17 is closed, and the second flow channel 31 stops flowing slurry to the surface of the substrate;

Open the upper control valve 16, and the slurry flows from the upper discharge port into the first discharge chamber 11, and then flows to the substrate through a plurality of first flow channels 21, forming an intermittent coating area P ₂ on the substrate. When coating to After the designated position, the upper control valve 16 is closed. At this time, the first flow channel 21 will no longer flow slurry to the surface of the substrate, and the intermittent coating area P ₂ is coated immediately behind the covering coating area P ₁ , so the two are joined;

Open the lower control valve 17 again, so that the slurry flows through the upper discharge port and then flows into the second discharge chamber 12. The slurry in the second discharge chamber 12 will flow from the second flow channel 31 to the substrate. At this time, immediately The covering coating area P ₁ is formed again after the intermittent coating area P ₂ . When the coating reaches the designated position, the lower control valve 17 is closed and the second flow channel 31 stops flowing slurry to the surface of the substrate;

At this point, the covering coating area P ₁ + the intermittent coating area P ₂ + the covering coating area P ₁ forms a partial coating area. After stopping coating for a certain distance, the above steps are repeated again for coating.

Furthermore, if there is a gap at the joint between the covering coating area P ₁ and the intermittent coating area P ₂ , the substrate will have uneven coating problems, which will affect the use of the final battery and reduce the quality of the battery; in order to avoid the intermittent coating area There is a gap at the joint between P ₂ and the covering paint area P _1. When the covering paint area P ₁ is formed, the upper control valve 16 will open, and the lower control valve 17 will close with a delay of T ₁ second, that is, the second flow channel 31 flows out to the base. The slurry area on the surface of the material is larger than the covering coating area P ₁ , and the extra coating slurry area just makes up for the lag problem between opening the upper control valve 16 and the outflow of the slurry from the first flow channel 21 . In this embodiment, T ₁ =3ms.

Furthermore, in order to avoid gaps between the covered coating area P ₁ and the intermittent coating area P ₂ , when the intermittent coating area P ₂ is about to be coated, the lower control valve 17 is opened T ₂ seconds in advance to allow the slurry to flow in again. to the second discharging chamber 12, specifically, T ₂ =3ms.

Through the above coating process, multiple staggered covering coating areas P ₁ and intermittent coating areas P ₂ are formed on the entire substrate surface, and the covering coating areas P ₁ and intermittent coating areas P ₂ achieve better joining.

The above descriptions are only embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations will occur to the present invention to those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims (10)

1. A coating die, comprising: the die head comprises a die head body (1), a first gasket (2) and a second gasket (3), wherein the die head body (1) is provided with a first discharging chamber (11) and a second discharging chamber (12) which are arranged at intervals, and the first gasket (2) and the second gasket (3) are respectively positioned in the first discharging chamber (11) and the second discharging chamber (12); the first gasket (2) is provided with a plurality of first flow passages (21) which are arranged at intervals, and the second gasket (3) is provided with a second flow passage (31);

wherein a plurality of the first flow channels (21) flow out of the slurry to form a discontinuous coating zone, and the second flow channels (31) flow out of the slurry to form a coating zone, and the discontinuous coating zone is jointed with the coating zone.

2. Coating die according to claim 1, characterized in that the die body (1) comprises an upper die (13), a middle die (14) and a lower die (15), the upper die (13), the middle die (14) and the lower die (15) being connected in sequence, the first gasket (2) being located between the upper die (13) and the middle die (14), the second gasket (3) being located between the middle die (14) and the lower die (15).

3. Coating die according to claim 1, characterized in that the first shim (2) comprises a first transverse plate (22), two first bending plates (23) and a plurality of baffle plates (24), the two first bending plates (23) are respectively connected with two ends of the first transverse plate (22), the plurality of baffle plates (24) are distributed at intervals on the first transverse plate (22), the plurality of baffle plates (24) are positioned between the two first bending plates (23), the space between the first bending plates (23) and the baffle plates (24) forms the first flow channel (21), and the space between the two baffle plates (24) also forms the first flow channel (21).

4. Coating die according to claim 1, characterized in that the second shim (3) comprises a second transverse plate (32) and two second bending flaps (33), the two second bending flaps (33) being connected to the two ends of the second transverse plate (32) respectively, the space between the two second bending flaps (33) forming the second flow channel (31).

5. A process for coating using the coating die according to any one of claims 1 to 4, comprising:

the slurry in the second discharging chamber flows into the second gasket (3), the slurry flows to the substrate through a second flow channel (31) of the second gasket (3), a coating area is formed on the substrate, and the slurry stops flowing after coating;

the slurry in the first discharging chamber flows into the first gasket (2), flows to the substrate through a plurality of first flow channels (21) of the first gasket (2), and forms a discontinuous coating area immediately after covering the coating area, and the slurry stops flowing after coating;

the alternating and bonded areas of covercoat and intermittent coat are continuously formed.

6. The coating process of claim 5, wherein the slurry delays T after forming the blanket coating area ₁ The inflow is stopped again for a second.

7. The coating process according to claim 6, wherein T is ₁ ＝3ms。

8. Coating process according to claim 5, characterized in that the time for the slurry in the second discharge chamber to flow again into the second gasket (3) is earlier than the time for the slurry in the first discharge chamber to stop flowing by T ₂ Second.

9. The coating process of claim 8, wherein T ₂ ＝3ms。

10. A process for coating using the coating die according to any one of claims 1 to 4, comprising:

the slurry in the second discharging chamber flows into the second gasket (3), the slurry flows to the substrate through a second flow channel (31) of the second gasket (3), a coating area is formed on the substrate, and the slurry stops flowing after coating;

the slurry in the first discharging chamber flows into the first gasket (2), flows to the substrate through a plurality of first flow channels (21) of the first gasket (2), and forms a discontinuous coating area immediately after covering the coating area, and the slurry stops flowing after coating;

the slurry in the second discharging chamber flows into the second gasket (3) again, the slurry flows to the substrate through a second flow channel (31) of the second gasket (3), a coating coverage area is formed immediately after the coating interruption area, and the slurry stops flowing after coating;

after a distance, the coating of the coating material area-intermittent coating material area-coating material area is carried out again.