Single-layer coating die head
By adopting a single-layer coating die design in the lithium-ion battery ear, the problems of low coating accuracy and dust residue are solved, ensuring that the paint is discharged from the same height, achieving more stable coating fusion and higher production efficiency.
Patent Information
- Application Number
- CN202420203890.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-01-26
AI Technical Summary
The existing lithium-ion battery middle-end coating process has problems such as low coating accuracy, dust residue and fluctuation in density of mutual dissolving zones, which affects battery performance and production efficiency.
Using a single-layer coating die head, the upper die head, lower die head and gasket design ensures that the two specifications of paint are discharged from the same height lip, forming a precisely controlled paint flow space, reducing dust residue and mutual dissolving area thickness Unstable.
Improves the stability of coating fusion quality, reduces paint waste, improves production efficiency, and enhances battery performance.
Smart Images
Figure CN222306260U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery manufacturing, and more specifically, to a single-layer coating die head. Background Art
[0002] With the rapid development of technology and the continuous expansion of demand, lithium-ion batteries have been widely used. Lithium-ion batteries play a core role in important fields such as modern mobile electronic products and new energy vehicles. However, in the production process of lithium-ion batteries, there is a crucial process that must be given enough attention, that is, the coating process. The quality and accuracy of the coating process will directly affect the performance of the battery and even determine the overall quality of the battery. In the traditional coating process, the tab is usually designed to be in the middle. Specifically, a square uncoated area is left in the middle of the coating as the place for the tab to be installed. Through such a design, the transmission distance of lithium ions in the battery on the pole piece can be greatly reduced, thereby effectively reducing the polarization internal resistance of the overall battery, and realizing high-current and high-rate charging and discharging of the battery.
[0003] The existing coating methods for the pole piece in the middle of the tab mainly include tab slot glue coating, laser cleaning and double-layer die intermittent method. However, these traditional methods all have some problems. Although the tab slot glue coating method is relatively simple, the coating accuracy is easily affected by the position of the tape, resulting in a low yield rate, which affects production efficiency and product performance. Although the laser cleaning method can clean and remove the coating at the designated position to form a central tab, it is easy to produce a large amount of dust residue. The dust generated by the laser ablation of the coating will not only pollute the production environment, but may also affect the performance of the battery and even pose a safety hazard. The double-layer die intermittent method uses two layers of die heads to coat in turn to create a pole piece with an empty foil area, but because the discharge ports of the two layers of die heads are not at the same height, the surface density of the fusion of the miscible zone generated during coating will fluctuate greatly, resulting in unstable battery performance. Utility Model Content
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a single-layer coating die head, which can allow two specifications of coatings to be discharged from a lip at the same height, thereby ensuring the problem of unstable coating fusion quality, while reducing coating waste and improving production efficiency.
[0005] The technical solution adopted by the utility model to solve the technical problem is: a single-layer coating die head, the improvement of which is that it includes an upper die head, a lower die head and a first gasket;
[0006] The first gasket is arranged between the upper die head and the lower die head, and a plurality of first discharge notches are arranged side by side on one side of the first gasket, and a discharge slot is arranged in the non-hollow area between every two first discharge notches, and a confluence buffer port is arranged on the other side of the first gasket away from the first discharge notch, and the confluence buffer port is connected with the discharge slot, and a first groove is arranged at a position of the lower die head near the first discharge notch, and the first groove fits the first gasket to form a die head main cavity, and the die head main cavity is connected with the first discharge notch, and a second groove is arranged at a position of the lower die head near the confluence buffer port, and the second groove fits the first gasket to form a die head sub-cavity, and the die head sub-cavity is connected with the confluence buffer port.
[0007] In the above structure, the upper die head and the lower die head are respectively provided with a second feed channel and a first feed channel, the first feed channel is connected with the die head sub-cavity through the discharge notch, and the second feed channel is connected with the die head main cavity.
[0008] In the above structure, the upper die head and the lower die head are respectively provided with a main cavity feed joint and a sub-cavity feed joint, the main cavity feed joint is connected to the first feed channel, and the sub-cavity feed joint is connected to the second feed channel.
[0009] A single-layer coating die head, the improvement of which is that it comprises an upper die head, a lower die head and a second gasket;
[0010] The second gasket is arranged between the upper die head and the lower die head, and a plurality of second discharge notches are arranged side by side on one side of the second gasket, and a discharge auxiliary notch is arranged in the non-hollow area between every two second discharge notches, and a third groove is arranged near the second discharge notch of the lower die head, and the third groove fits the second gasket to form a first slow flow cavity, and the first slow flow cavity is connected with the second discharge notch, and a slow flow groove is arranged near the discharge auxiliary notch of the lower die head, and the slow flow groove is connected with the discharge auxiliary notch.
[0011] In the above structure, the upper die head and the lower die head are respectively provided with a second feed channel and a first feed channel, the first feed channel is communicated with the first slow flow cavity, and the second feed channel is communicated with the slow flow groove.
[0012] In the above structure, the upper die head and the lower die head are respectively provided with a main cavity feed joint and a sub-cavity feed joint, the main cavity feed joint is connected to the first feed channel, and the sub-cavity feed joint is connected to the second feed channel.
[0013] In the above structure, the lower die head is provided with a second feed channel and a first feed channel, the first feed channel is communicated with the first slow flow cavity, and the second feed channel is communicated with the slow flow groove.
[0014] In the above structure, the lower die head is respectively provided with a main cavity feed joint and a sub-cavity feed joint, the main cavity feed joint is connected to the first feed channel, and the sub-cavity feed joint is connected to the second feed channel.
[0015] In the above structure, the bottom of the upper die head and the top of the lower die head are respectively provided with a first coating lip and a second coating lip, and the first coating lip and the second coating lip are both rectangular protrusions.
[0016] In the above structure, the upper die head is provided with a plurality of micrometers.
[0017] The beneficial effect of the utility model is that two specifications of paint can be left out from the lip of the same height, thereby ensuring the problem of unstable paint fusion quality, reducing paint waste and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the overall structure of a single-layer coating die head of the utility model;
[0019] Figure 2 It is a schematic cross-sectional view of the main cavity of a single-layer coating die of the utility model;
[0020] Figure 3 It is a schematic cross-sectional view of a die sub-cavity of a single-layer coating die of the utility model;
[0021] Figure 4 It is a partial structural schematic diagram of a single-layer coating die head of the utility model;
[0022] Figure 5 This is a coating effect diagram of a single-layer coating die head of the utility model;
[0023] Figure 6 This is a schematic diagram of the overall structure of a single-layer coating die head of the utility model in which the second feed channel is placed on top;
[0024] Figure 7 It is a partial structural schematic diagram of a second feed channel of a single-layer coating die head of the utility model;
[0025] Figure 8 It is a schematic cross-sectional view of a sub-cavity disposed on the second feed channel of a single-layer coating die head of the utility model;
[0026] Fig. 9 It is a schematic cross-sectional view of a main cavity of a single-layer coating die head of the utility model, in which a second feed channel is placed above the main cavity;
[0027] Fig.10 This is a schematic diagram of the overall structure of a single-layer coating die head of the utility model in which the second feed channel is placed downward;
[0028] Fig.11 It is a partial structural schematic diagram of a single-layer coating die head of the utility model in which the second feed channel is placed downward;
[0029] Fig.12 It is a schematic cross-sectional view of a sub-cavity with a second feed channel placed below a single-layer coating die head of the utility model;
[0030] Fig.13 This is a schematic cross-sectional view of the main cavity of a single-layer coating die head of the utility model in which the second feed channel is located below. DETAILED DESCRIPTION
[0031] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0032] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.
[0033] Example 1
[0034] Reference Figures 1 to 4 As shown, the utility model discloses a single-layer coating die head, specifically, comprising an upper die head 10, a lower die head 20 and a first gasket 30;
[0035] The first gasket 30 is arranged between the upper die head 10 and the lower die head 20, and a plurality of first discharge notches 301 are arranged side by side on one side of the first gasket 30, and a discharge slot 302 is provided in the non-hollow area between every two first discharge notches 301, and a confluence buffer port 303 is provided on the other side of the first gasket 30 away from the first discharge notch 301, and the confluence buffer port 303 is communicated with the discharge slot 302, and a first groove is provided at a position of the lower die head 20 near the first discharge notch 301, and the first groove fits the first gasket 30 to form a die main cavity 203, and the die main cavity 203 is communicated with the first discharge notch 301, and a second groove is provided at a position of the lower die head 20 near the confluence buffer port 303, and the second groove fits the first gasket 30 to form a die sub-cavity 204, and the die sub-cavity 204 is communicated with the confluence buffer port 303. The lower die 20 is designed with a first groove and a second groove, which are respectively used to cooperate with the first gasket 30 to form a die main cavity 203 and a die sub-cavity 204, which play a role in stabilizing the pressure of the slurry entering the die to ensure uniform lateral coating thickness.
[0036] Reference Figures 3 to 5 As shown, the bottom of the upper die head 10 and the top of the lower die head 20 are respectively provided with a first coating lip 40 and a second coating lip 60, and the first coating lip 40 and the second coating lip 60 are both rectangular protrusions. Such a setting can effectively create a space for accurately controlling the flow of the coating. In the actual coating process, such a space can help achieve more uniform coating and reduce coating waste. The upper die head 10 is provided with a plurality of micrometers 70, which are extremely high-precision measuring tools. The use of a plurality of micrometers 70 can more accurately measure and adjust the position and gap of the upper die head 10. Through the readings of the plurality of micrometers 70, the state of the die head can be monitored in real time, problems can be discovered and solved in time, and the smooth progress of production can be ensured.
[0037] Further, the upper die head 10 and the lower die head 20 are respectively provided with a second feed channel 206 and a first feed channel 205, the first feed channel 205 is connected to the die head sub-cavity 204 through the discharge notch 302, and the second feed channel 206 is connected to the die head main cavity 203. The coating slurry enters the die head main cavity 203 through the first feed channel 205, flows out from the first discharge notch 301, and forms a lower layer flow channel. The coating slurry can also enter the die head sub-cavity 204 from the second feed channel 206, and flows out to the discharge notch 302 through the confluence buffer port 303, forming an upper layer flow channel. The upper die head 10 and the lower die head 20 are respectively provided with a main cavity feed connector 207 and a sub-cavity feed connector 208, the main cavity feed connector 207 is connected to the first feed channel 205, and the sub-cavity feed connector 208 is connected to the second feed channel 206. The main cavity feed connector 207 and the auxiliary cavity feed connector 208 correspond to the two layers of flow channels of the first gasket 30 respectively. During coating, the upper and lower layers of flow channels can be controlled separately to form a layer of gap coating and a layer of continuous coating. The coating slurry intersects at the first coating lip 40 and the second coating lip 60 of the die head and is coated on the pole piece together. At the intersection of the two layers of the first gasket 30, the local thickness of the discharge slot 302 can be controlled to reduce the height difference between the two independent flow channels, so that the thickness consistency of the mutual dissolution zone and the overall coating zone is better. Different mutual dissolution zone thickness trends can also be achieved by changing the chamfers of different sizes to ensure that the thickness of the mutual dissolution zone is consistent with the entire pole piece coating zone under different working conditions. The upper die head 10, the lower die head 20 and the first gasket 30 are used for coating, and the intermittent coating and continuous coating of the single-layer die head can be mixed. The first discharge notch 301 and the discharge slot 302 are coated together to form a continuous coating area. The discharge slot 302 discharges the material for coating, and the first discharge notch 301 is rested to obtain an intermittent coating area, so as to obtain Figure 5 The pole piece shown has a coated effect with a rectangular blank.
[0038] Example 2
[0039] Reference Figures 6 to 9 As shown, the utility model discloses a single-layer coating die head, specifically, comprising an upper die head 10, a lower die head 20 and a second gasket 50;
[0040] The second gasket 50 is arranged between the upper die head 10 and the lower die head 20. A plurality of second discharge notches 503 are arranged side by side on one side of the second gasket 50, and a discharge auxiliary notch 504 is arranged in the non-hollow area between each two second discharge notches 503. The lower die head 20 is provided with a third groove 501 near the second discharge notch 503. The third groove 501 is fitted with the second gasket 50 to form a first slow flow chamber 502, which can buffer the flow speed of the coating, ensure smooth discharge of the coating, and improve the uniformity of coating. The first slow flow chamber 502 is connected with the second discharge notch 503. The lower die head 20 is provided with a slow flow groove 505 near the discharge auxiliary notch 504, and the slow flow groove 505 is connected with the discharge auxiliary notch 504. Such a design can further provide flow space for the coating, has a certain degree of buffering effect, and helps to keep the flow rate and pressure of the coating stable during the coating process.
[0041] The bottom of the upper die head 10 and the top of the lower die head 20 are respectively provided with a first coating lip 40 and a second coating lip 60, and the first coating lip 40 and the second coating lip 60 are both rectangular protrusions. Such a setting can effectively create a space for accurately controlling the flow of the coating. In the actual coating process, such a space can help achieve more uniform coating and reduce coating waste. The upper die head 10 is provided with a plurality of micrometers 70, which are extremely high-precision measuring tools. The position and gap of the upper die head 10 can be more accurately measured and adjusted by using a plurality of micrometers 70. Through the readings of the plurality of micrometers 70, the state of the die head can be monitored in real time, problems can be discovered and solved in time, and the smooth progress of production can be ensured.
[0042] like Figures 6 to 9 In the embodiment, the upper die head 10 and the lower die head 20 are respectively provided with a second feed channel 206 and a first feed channel 205, wherein the first feed channel 205 is connected to the first slow flow cavity 502, and the second feed channel 206 is connected to the slow flow groove 505. The upper die head 10 and the lower die head 20 are respectively provided with a main cavity feed joint 207 and a secondary cavity feed joint 208, wherein the main cavity feed joint 207 is connected to the first feed channel 205, and the secondary cavity feed joint 208 is connected to the second feed channel 206. The second feed channel 206 and the secondary cavity joint are both provided on the lower die head 20, and the coating slurry enters the first slow flow cavity 502 through the first feed channel 205, and flows out from the second discharge notch 503 to form a main flow channel. The coating slurry can also enter the slow flow groove 505 from the second feed channel 206, and flow out from the discharge secondary notch 504 to form a secondary flow channel. The two flow channels are connected to valve bodies that independently control the on and off of the flow channels. By calculating the time and related coating parameters, the coating requirement of leaving a blank space in the middle can be achieved.
[0043] Example 3
[0044] Reference Figures 10 to 13 As shown, the utility model discloses a single-layer coating die head, specifically, comprising an upper die head 10, a lower die head 20 and a second gasket 50;
[0045] The second gasket 50 is arranged between the upper die head 10 and the lower die head 20. A plurality of second discharge notches 503 are arranged side by side on one side of the second gasket 50, and a discharge auxiliary notch 504 is arranged in the non-hollow area between each two second discharge notches 503. The lower die head 20 is provided with a third groove 501 near the second discharge notch 503. The third groove 501 is fitted with the second gasket 50 to form a first slow flow chamber 502, which can buffer the flow speed of the coating, ensure smooth discharge of the coating, and improve the uniformity of coating. The first slow flow chamber 502 is connected with the second discharge notch 503. The lower die head 20 is provided with a slow flow groove 505 near the discharge auxiliary notch 504, and the slow flow groove 505 is connected with the discharge auxiliary notch 504. Such a design can further provide flow space for the coating, has a certain degree of buffering effect, and helps to keep the flow rate and pressure of the coating stable during the coating process.
[0046] The bottom of the upper die head 10 and the top of the lower die head 20 are respectively provided with a first coating lip 40 and a second coating lip 60, and the first coating lip 40 and the second coating lip 60 are both rectangular protrusions. Such a setting can effectively create a space for accurately controlling the flow of the coating. In the actual coating process, such a space can help achieve more uniform coating and reduce coating waste. The upper die head 10 is provided with a plurality of micrometers 70, which are extremely high-precision measuring tools. The position and gap of the upper die head 10 can be more accurately measured and adjusted by using a plurality of micrometers 70. Through the readings of the plurality of micrometers 70, the state of the die head can be monitored in real time, problems can be discovered and solved in time, and the smooth progress of production can be ensured.
[0047] like Figures 10 to 13In the embodiment, the lower die head 20 is provided with a second feed channel 206 and a first feed channel 205, wherein the first feed channel 205 is connected to the first slow flow cavity 502, and the second feed channel 206 is connected to the slow flow groove 505. The lower die head 20 is provided with a main cavity feed joint 207 and a secondary cavity feed joint 208, respectively, wherein the main cavity feed joint 207 is connected to the first feed channel 205, and the secondary cavity feed joint 208 is connected to the second feed channel 206. The second flow channel and the secondary cavity joint are provided on the upper die head 10, and the coating slurry enters the first slow flow cavity 502 through the first feed channel 205, and flows out from the second discharge notch 503 to form a main flow channel. The coating slurry can also enter the slow flow groove 505 from the second feed channel 206, and flow out from the discharge secondary notch 504 to form a secondary flow channel. The upper die head 10 and the lower die head 20 are respectively provided with a main cavity feed connector 207 and a secondary cavity feed connector 208, wherein the main cavity feed connector 207 is connected to the first feed channel 205, and the secondary cavity feed connector 208 is connected to the second feed channel 206. The two flow channels are respectively connected to valve bodies that independently control the on-off of the flow channels, and the time and related coating parameters are calculated, so that the coating requirement of leaving a blank in the middle can be formed.
[0048] The beneficial effect of the utility model is that paints of two specifications can be left out from the lip of the same height, thereby ensuring the problem of unstable paint fusion quality, reducing paint waste and improving production efficiency.
[0049] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A single-layer coating die head, characterized in that: It includes an upper die head, a lower die head and a first gasket; The first gasket is arranged between the upper die head and the lower die head, and a plurality of first discharge notches are arranged side by side on one side of the first gasket, and a discharge slot is arranged in the non-hollow area between every two first discharge notches, and a confluence buffer port is arranged on the other side of the first gasket away from the first discharge notch, and the confluence buffer port is connected with the discharge slot, and a first groove is arranged at a position of the lower die head near the first discharge notch, and the first groove fits the first gasket to form a die head main cavity, and the die head main cavity is connected with the first discharge notch, and a second groove is arranged at a position of the lower die head near the confluence buffer port, and the second groove fits the first gasket to form a die head sub-cavity, and the die head sub-cavity is connected with the confluence buffer port.
2. A single-layer coating die head according to claim 1, characterized in that: The upper die head and the lower die head are respectively provided with a second feed channel and a first feed channel, the first feed channel is connected with the die head sub-cavity through a discharge notch, and the second feed channel is connected with the die head main cavity.
3. A single-layer coating die head according to claim 1, characterized in that: The upper die head and the lower die head are respectively provided with a main cavity feed joint and a sub-cavity feed joint, the main cavity feed joint is communicated with the first feed channel, and the sub-cavity feed joint is communicated with the second feed channel.
4. A single-layer coating die head, characterized in that: It includes an upper die head, a lower die head and a second gasket; The second gasket is arranged between the upper die head and the lower die head, and a plurality of second discharge notches are arranged side by side on one side of the second gasket, and a discharge auxiliary notch is arranged in the non-hollow area between every two second discharge notches, and a third groove is arranged near the second discharge notch of the lower die head, and the third groove fits the second gasket to form a first slow flow cavity, and the first slow flow cavity is connected with the second discharge notch, and a slow flow groove is arranged near the discharge auxiliary notch of the lower die head, and the slow flow groove is connected with the discharge auxiliary notch.
5. A single-layer coating die according to claim 4, characterized in that: The upper die head and the lower die head are respectively provided with a second feed channel and a first feed channel, the first feed channel is communicated with the first slow flow cavity, and the second feed channel is communicated with the slow flow groove.
6. A single-layer coating die head according to claim 5, characterized in that: The upper die head and the lower die head are respectively provided with a main cavity feed joint and a sub-cavity feed joint, the main cavity feed joint is communicated with the first feed channel, and the sub-cavity feed joint is communicated with the second feed channel.
7. A single-layer coating die head according to claim 4, characterized in that: The lower die head is provided with a second feed channel and a first feed channel, the first feed channel is communicated with the first slow flow cavity, and the second feed channel is communicated with the slow flow groove.
8. A single-layer coating die according to claim 7, characterized in that: The lower die head is respectively provided with a main cavity feed joint and a sub-cavity feed joint, the main cavity feed joint is communicated with the first feed channel, and the sub-cavity feed joint is communicated with the second feed channel.
9. A single-layer coating die according to claim 1 or 4, characterized in that: The bottom of the upper die head and the top of the lower die head are respectively provided with a first coating lip and a second coating lip, and the first coating lip and the second coating lip are both rectangular protrusions.
10. A single-layer coating die according to claim 1 or 4, characterized in that: The upper die head is provided with a plurality of micrometers.