An electrode sheet coating device

Abstract

This utility model relates to the field of battery electrode production technology and discloses an electrode coating device, including a coating die, a feeding pipe, and a coating component. The coating die has a discharge port, and multiple cavity groups are spaced apart along a first direction inside the coating die. Each cavity group includes a first cavity and a second cavity arranged and connected along a second direction, with the second cavity connected to the discharge port. Multiple feeding pipes are provided, each corresponding to one of the cavity groups and connected to the first cavity. The coating component is used to carry the electrode and is arranged opposite to the discharge port along the second direction. This utility model can improve the uniformity of the electrode coating surface density, resulting in a higher uniformity of the produced electrode coating surface density and avoiding the impact of uneven electrode coating surface density on battery performance.

Description

Technical Field

[0001] This utility model relates to the field of battery electrode production technology, and in particular to an electrode coating device. Background Technology

[0002] In power battery production, improving the uniformity of electrode surface density is one of the important means to improve the overall performance of power batteries. Currently, during electrode coating, a precision feed screw pump is typically used to supply material to a single coating die. This results in large fluctuations in electrode surface density during the coating process, leading to poor uniformity in the produced electrode surface density. Electrodes with uneven surface density flowing into subsequent processes ultimately have an adverse effect on battery performance. Utility Model Content

[0003] The purpose of this invention is to provide an electrode coating device to improve the uniformity of electrode surface density.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides an electrode coating device having a first direction and a second direction that are perpendicular to each other, including:

[0006] A coating die head is provided with a discharge port. The coating die head is provided with a plurality of cavity groups spaced apart along the first direction. The cavity group includes a first cavity and a second cavity arranged and connected along the second direction. The second cavity is connected to the discharge port.

[0007] Multiple feed pipes are provided, each feed pipe corresponding to one of the cavity groups and communicating with the first cavity; and

[0008] A coating component is used to carry the electrode sheet and is disposed opposite to the discharge port along the second direction.

[0009] In some embodiments, it also includes:

[0010] A flow regulator is provided on the feed pipe to regulate the flow rate entering the first cavity;

[0011] The testing mechanism, located downstream of the coating component, is used to test the surface density of the electrode coating after passing through the coating component.

[0012] In some embodiments, a controller is also included, wherein the flow regulator and the detection mechanism are electrically connected to the controller, and the controller is used to receive data from the detection mechanism and send regulation commands to the flow regulator.

[0013] In some embodiments, the dimension of the first cavity along the second direction is W1, and the dimension of the second cavity along the second direction is W2, wherein W1 and W2 satisfy: W1>W2.

[0014] In some embodiments, the dimension of the first cavity along the first direction is L1, and the dimension of the second cavity along the first direction is L2, where L1 and L2 satisfy: L1 = L2.

[0015] In some embodiments, the coating die head includes an upper die, a lower die, and a gasket. The upper die is connected to the lower die and surrounds a plurality of the cavity groups. The gasket is sandwiched between the upper die and the lower die, and the gasket is at least partially located between two adjacent cavity groups to space them apart. A gap is formed between one end of the upper die along the second direction and one end of the lower die along the same direction to form the discharge port.

[0016] In some embodiments, the lower surface of the upper mold is provided with a first protrusion extending along the second direction, and the upper surface of the lower mold is provided with a second protrusion extending along the second direction, and the gap between the first protrusion and the second protrusion forms the gap.

[0017] In some embodiments, the coating die head is further provided with a plurality of feed ports, the plurality of feed ports are spaced apart along the first direction, the plurality of feed ports are connected to a plurality of the first cavities, and the feed pipe is connected to the feed ports.

[0018] In some embodiments, the feed inlet has a first central axis, the first cavity has a second central axis parallel to the second direction, and the first central axis and the second central axis are collinear.

[0019] In some embodiments, a feed manifold is further included, with a first end connected to each of the feed pipes and a second end connected to the feeding system.

[0020] Compared with the prior art, the electrode coating device of this utility model has the following advantages:

[0021] The electrode coating apparatus of this utility model embodiment has multiple cavity groups spaced apart inside the coating die head. Each cavity group includes a first cavity and a second cavity, which are arranged and connected along a second direction. A feed pipe is connected to the first cavity, and coating components are arranged opposite to the outlet of the coating die head. Slurry is supplied to the coating die head through the feed pipe. Inside the coating die head, the slurry first enters the first cavity. After the flow rate and pressure in the first cavity stabilize and the cavity is filled, the slurry overflows from the first cavity into the corresponding second cavity, and then is evenly extruded and coated onto the current collector through the outlet. Because multiple first cavities are spaced apart along the first direction, each first cavity is relatively independent and uses an independent feed pipe for feeding. Compared to feeding the coating die head through a single feed port, this application can improve the uniformity of the slurry along the length of the first cavity. In the second direction, each first cavity has a corresponding second cavity. The slurry first passes through the first cavity to stabilize its flow rate and pressure. After the slurry is stabilized in the first cavity, it enters the second cavity, reducing pressure fluctuations and improving the uniformity of slurry extrusion within the second cavity. This improves the uniformity of electrode coating surface density, resulting in a higher uniformity of the produced electrode coating surface density and preventing uneven electrode coating surface density from affecting battery performance. Furthermore, the feed pipe, first cavity, and second cavity of this application form independent feeding paths, facilitating individual adjustment of the slurry supply to each feeding path, thereby enabling individual adjustment of areas with poor surface density. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the electrode coating device described in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the coating die head in an embodiment of this utility model;

[0024] Figure 3 This is an exploded view of the coating die head in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the connection between the feed pipe and the lower mold in an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the flow regulating component in an embodiment of this utility model;

[0027] Figure 6 This is a schematic diagram showing the connection between the feed pipe and the feed main pipe in an embodiment of this utility model.

[0028] Numbering on the map:

[0029] 10. Coating die head; 101. Discharge port; 102. Inlet port; 1021. First central axis; 11. Cavity assembly; 111. First cavity; 1111. Second central axis; 112. Second cavity; 12. Upper die; 121. First flange; 13. Lower die; 131. Second flange; 14. Gasket; 141. Threaded hole; 20. Feed pipe; 30. Flow regulating component; 301. Flow inlet; 302. Flow outlet; 40. Coating component; 41. Back roller; 50. Detection mechanism; 60. Feed manifold; 601. First end; 602. Second end; 70. Current collector; 80. Electrode; X, First direction; Y, Second direction. Detailed Implementation

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0033] See Figure 1As shown, this utility model embodiment provides an electrode coating device with a first direction X and a second direction Y perpendicular to each other. It includes a coating die head 10, a feeding pipe 20, and a coating component 40. The coating die head 10 is provided with a discharge port 101. Multiple cavity groups 11 are arranged at intervals along the first direction X inside the coating die head 10. The cavity group 11 includes a first cavity 111 and a second cavity 112 arranged and connected along the second direction Y. The second cavity 112 is connected to the discharge port 101. Multiple feeding pipes 20 are provided. Each feeding pipe 20 corresponds to one of the cavity groups 11 and is connected to the first cavity 111. The feeding pipe 20 is used to connect to a feeding system, and the feeding system quantitatively delivers slurry to the feeding pipe 20. The coating component 40 is used to carry the electrode and is arranged opposite to the discharge port 101 along the second direction Y.

[0034] The slurry is supplied to the coating die head 10 through the feed pipe 20. In the coating die head 10, the slurry first enters the first cavity 111. After the flow rate and pressure in the first cavity 111 stabilize and the first cavity 111 is filled, the slurry overflows from the first cavity 111 into the corresponding second cavity 112, and then is evenly extruded and coated on the collector through the discharge port 101. Since multiple first cavities 111 are spaced apart along the first direction X, and each first cavity 111 is relatively independent, each first cavity 111 is fed through an independent feed pipe 20. Compared with the method of feeding the coating die head 10 through a single feed port, this application can improve the uniformity of the slurry in the length direction of the first cavity 111. In the second direction Y, the first cavity 111 is provided with a corresponding second cavity 112. The slurry first passes through the first cavity 111 to stabilize the flow rate and pressure. After the slurry is stabilized in the first cavity 111, it enters the second cavity 112. This can reduce the pressure fluctuation of the slurry in the second cavity 112, improve the uniformity of the slurry extrusion in the second cavity 112, thereby improving the uniformity of the electrode surface density and making the produced electrode surface density more uniform, avoiding the impact of uneven electrode surface density on battery performance. Furthermore, the feed pipe 20, the first cavity 111 and the second cavity 112 of this application form an independent feed path, which facilitates the individual adjustment of the slurry supply in each feed path, thereby facilitating the individual adjustment of each area with poor surface density.

[0035] See Figure 3 As shown, in some embodiments, the first direction X is the length direction of the coating die 10, and the second direction Y is the width direction of the coating die 10. The first direction X and the second direction Y are perpendicular to each other. A plurality of cavity groups 11 are uniformly arranged within the coating die 10 along the first direction X.

[0036] See Figure 1As shown, in some embodiments, the electrode coating apparatus further includes a flow regulating element 30 and a detection mechanism 50. The flow regulating element 30 is disposed on the feed pipe 20 and is used to regulate the flow rate entering the first cavity 111. The detection mechanism 50 is disposed downstream of the coating member 40 and is used to detect the surface density of the electrode coating after passing through the coating member 40. The feed pipe 20, the first cavity 111, and the second cavity 112 of this application form independent feeding paths. The flow regulating element 30 is provided on the feeding path, which allows for individual adjustment of the slurry supply to the feeding path, thereby allowing for individual adjustment of each area with poor surface density. When the detection mechanism 50 detects poor surface density in a portion of the electrode coating, the amount of slurry entering the corresponding first cavity 111 can be adjusted by the flow regulating element 30 on the corresponding feed pipe 20, thereby adjusting the surface density of the electrode coating corresponding to that feeding path. This provides a rapid response, improves the timeliness of the surface density adjustment of the electrode coating, and results in a higher consistency of the surface density of the produced electrode coating.

[0037] See Figure 1 As shown, in some embodiments, the detection mechanism 50 is a areal density meter, which can detect the areal density value of the entire width of the electrode and can independently display and analyze the areal density of the corresponding electrode film area. In some embodiments, the flow regulating component 30 is a flow regulating valve, which controls the flow rate by controlling the valve opening. The flow regulating valve has a flow inlet 301 and a flow outlet 302. The flow inlet 301 is connected to the feed pipe 20, and the flow outlet 302 is connected to the first cavity 111. The flow inlet 301 and the feed pipe 20 can be connected by a clamp flange.

[0038] In some embodiments, the electrode coating apparatus further includes a controller. A flow regulator 30 and a detection mechanism 50 are electrically connected to the controller. The controller receives data from the detection mechanism 50 and sends adjustment commands to the flow regulator 30. After the detection mechanism 50 detects the areal density of each film region, it compares it with a set areal density value. Based on the detection data from the detection mechanism 50, the controller controls the flow regulator 30 on the corresponding feed pipe 20 to adjust the amount of slurry entering the corresponding first chamber 111, thereby adjusting the coating areal density of local areas of the electrode and improving automation. After the flow regulator 30 adjusts the flow rate of the corresponding first chamber 111, the slurry is coated on the surface of the current collector 70 and dried. The detection mechanism 50 then measures the areal density value of the electrode again until an electrode with an areal density value within the set range is obtained. It should be noted that the controller adjusts the flow rate by controlling the valve opening of the flow regulator 30.

[0039] See Figures 1-4As shown, in some embodiments, the coating die 10 is further provided with multiple feed ports 102, which are spaced apart along a first direction X. Each feed port 102 communicates with a plurality of first cavities 111, and the feed pipe 20 is connected to the feed port 102. By providing feed ports 102 on the coating die 10, the connection between the feed pipe 20 and the coating die 10 is facilitated. Furthermore, the one-to-one correspondence between the feed ports 102 and the first cavities 111 ensures independent feeding of the first cavities 111. The feed ports 102 are connected to the flow outlet 302 of the flow regulating component 30, and the two can be connected via a clamp flange.

[0040] See Figure 3 As shown, in some embodiments, the feed inlet 102 has a first central axis 1021, which is the line connecting the geometric centers of the feed inlet 102 and is parallel to the depth direction of the feed inlet 102; the first cavity 111 has a second central axis 1111 parallel to the second direction Y, and the first central axis 1021 and the second central axis 1111 are collinear. This arrangement allows the slurry entering the first cavity 111 through the feed inlet 102 to diffuse from the center of the first cavity 111 to both sides, improving the diffusion rate and uniformity of the slurry in the first cavity 111 and preventing the slurry from accumulating near the feed inlet 102.

[0041] See Figure 1 , Figure 4 and Figure 6 As shown, in some embodiments, the electrode coating apparatus further includes a feed manifold 60. The first end 601 of the feed manifold 60 is connected to each feed pipe 20, and the second end 602 of the feed manifold 60 is used to connect to a feeding system. The feeding system supplies material to each feed pipe 20 through the same feed manifold 60, ensuring a stable flow of slurry into each feed pipe 20 and balancing the supply pressure in each feed pipe 20. This, in turn, balances the pressure entering the corresponding first cavity 111 through each feed pipe 20. In some embodiments, three feed pipes 20 may be provided, correspondingly, three first cavities 111 and three second cavities 112 are provided. The feed pipes 20 and the feed manifold 60 are connected as a single unit, facilitating connection to the coating die head 10.

[0042] See Figures 1-3As shown, in some embodiments, the coating die 10 includes an upper die 12, a lower die 13, and a gasket 14. The upper die 12 is connected to the lower die 13 and forms multiple cavity groups 11. The gasket 14 is sandwiched between the upper die 12 and the lower die 13, and the gasket 14 is at least partially located between two adjacent cavity groups 11 to space them apart. A gap is formed between one end of the upper die 12 along the second direction Y and one end of the lower die 13 along the same direction to form a discharge port 101. A feed port 102 is provided on the lower die 13. This arrangement facilitates the assembly, maintenance, and cleaning of the coating die 10. By forming the discharge port 101 by leaving a gap between the upper die 12 and the lower die 13, the structure is simplified, avoiding separate openings on the upper die 12 or the lower die 13. For easy assembly and disassembly, the upper die 12 and the lower die 13 are detachably connected. In some embodiments, threaded holes 141 are provided on the upper mold 12, the lower mold 13, and the gasket 14, and the upper mold 12, the lower mold 13, and the gasket 14 are connected by bolts. The gasket 14 is located between the upper mold 12 and the lower mold 13, and the specifications of the gasket 14 can be determined according to the specifications of the product electrode.

[0043] See Figure 2 As shown, in some embodiments, the lower surface of the upper die 12 extends along the second direction Y and is provided with a first protruding edge 121, and the upper surface of the lower die 13 extends along the second direction Y and is provided with a second protruding edge 131, and the gap between the first protruding edge 121 and the second protruding edge 131 forms a slit. The first protruding edge 121 and the second protruding edge 131 can play a certain guiding role in the extrusion of the slurry.

[0044] In some embodiments, both the first cavity 111 and the second cavity 112 are rectangular parallelepipeds, and the tops of the first cavity 111 and the second cavity 112 are connected. (See also...) Figure 4As shown, the width of the first cavity 111 and the second cavity 112 extends along the second direction Y, and the length of the first cavity 111 and the second cavity 112 extends along the first direction X. The dimension of the first cavity 111 along the second direction Y is W1, and the dimension of the second cavity 112 along the second direction Y is W2, where W1 and W2 satisfy: W1 > W2. This arrangement ensures that the slurry enters the second cavity 112 only after the flow rate and pressure in the first cavity 111 have stabilized sufficiently, preventing the slurry from entering the second cavity 112 before it has stabilized in the first cavity 111, thus ensuring minimal pressure fluctuations in the second cavity 112. In some embodiments, the dimension of the first cavity 111 along the first direction X is L1, and the dimension of the second cavity 112 along the first direction X is L2, where L1 and L2 satisfy: L1 = L2. With this configuration, the dimensions of the first cavity 111 and the second cavity 112 are approximately the same in the first direction X. This ensures that after the slurry overflows from the first cavity 111, it enters the second cavity 112 evenly and diffuses rapidly within it. If L2 is much smaller than L1, some of the slurry overflowing from the first cavity 111 will not have enough time to enter the second cavity 112 before flowing towards the outlet 102, resulting in uneven slurry extrusion from the outlet 102. If L2 is much larger than L1, the slurry overflowing from the first cavity 111 will need to diffuse further within the second cavity 112, potentially leading to uneven slurry diffusion.

[0045] See Figure 1 As shown, in some embodiments, the coating component 40 includes a back roller 41. The rotation of the back roller 41 drives the current collector 70 to rotate. During the rotation of the current collector 70, the slurry is extruded from the discharge port 101 and uniformly coated onto the current collector 70. After drying, it forms an electrode 80. The formed electrode 80 passes through the detection mechanism 50 driven by the back roller 41. The detection mechanism 50 detects the areal density value of the entire width of the electrode 80 and can independently display and analyze the areal density of the corresponding electrode film area.

[0046] Taking the coating die head 10 with three cavity groups 11 as an example, the working process of this utility model is as follows:

[0047] The center value of the electrode surface density is defined as M, the upper threshold of the electrode coating surface density is M+n, and the lower threshold of the electrode coating surface density is Mt. Therefore, the set range of the electrode coating surface density is [Mt, M+n].

[0048] The slurry enters the coating die head 10 through the feed pipe 20. After filling the first cavity 111, the slurry overflows into the second cavity 112 and flows out through the second cavity 112 to the discharge port 102. It is then uniformly extruded and coated onto the current collector 70 through the discharge port 102, and after drying, forms an electrode 80. The electrode 80, driven by the back roller 41, is measured by the detection mechanism 50 to determine the surface density of the electrode coating. The surface density values ​​of the corresponding film areas detected by the detection mechanism 50 are N1, N2, and N3, respectively. N1, N2, and N3 correspond to the surface density values ​​of the electrode coating formed after the slurry passes through each cavity group 11 and are measured by the detection mechanism 50. If N1, N2, and N3 are all within the set threshold range [Mt, M+n], the obtained electrode is qualified.

[0049] If at least one of the values ​​of N1, N2, and N3 is less than the lower threshold value Mt of the electrode coating surface density, the controller controls the corresponding flow regulator 30 to increase the flow rate. After adjustment, at the set speed, since the mechanical distance between the detection mechanism 50 and the flow regulator 30 is fixed, a fixed time can be obtained for the adjusted electrode to reach the detection mechanism 50. After the electrode 80 formed after the flow adjustment reaches the detection mechanism 50 again, the detected surface density value of the membrane area is compared with the lower threshold value Mt of the electrode coating surface density. This process is repeated until the detected surface density value of the membrane area is within the set threshold range.

[0050] If at least one of the values ​​of N1, N2, and N3 is greater than the upper threshold value M+n of the electrode surface density, the controller controls the corresponding flow regulator 30 to reduce the flow rate. After adjustment, at the set speed, since the mechanical distance between the detection mechanism 50 and the flow regulator 30 is fixed, a fixed time can be obtained for the adjusted electrode to reach the detection mechanism 50. After the electrode 80 formed after the flow adjustment reaches the detection mechanism 50 again, the detected surface density value of the film area is compared with the upper threshold value M+n of the electrode coating surface density. This process is repeated until the detected surface density value of the film area is within the set threshold range.

[0051] In this invention, each cavity group 11 is fed through an independent feeding path. When two of the areal density values ​​N1, N2, and N3 are not within the set threshold range, the corresponding flow regulating element 30 can be controlled separately to adjust the areal density value of each membrane area so that the areal density value of each membrane area is within the set threshold range.

[0052] In summary, this utility model embodiment provides an electrode coating device. The slurry is supplied to the coating die head 10 through the feed pipe 20. In the coating die head 10, the slurry first enters the first cavity 111. After the flow rate and pressure in the first cavity 111 stabilize and the first cavity 111 is filled, the slurry overflows from the first cavity 111 into the corresponding second cavity 112, and then is uniformly extruded and coated on the current collector through the discharge port 101. Since multiple first cavities 111 are spaced apart along the first direction X, and each first cavity 111 is relatively independent, each first cavity 111 is fed through an independent feed pipe 20. Compared with the method of feeding the coating die head 10 through a single feed port, this application can improve the uniformity of the slurry in the length direction of the first cavity 111. In the second direction Y, the first cavity 111 is provided with a corresponding second cavity 112. The slurry first passes through the first cavity 111 to stabilize the flow rate and pressure. After the slurry is stabilized in the first cavity 111, it enters the second cavity 112. This can reduce the pressure fluctuation of the slurry in the second cavity 112, improve the uniformity of the slurry extrusion in the second cavity 112, thereby improving the uniformity of the electrode surface density and making the produced electrode surface density more uniform, avoiding the impact of uneven electrode surface density on battery performance. Furthermore, the feed pipe 20, the first cavity 111, and the second cavity 112 of this application form an independent feeding path. When the detection mechanism 50 detects that the coating surface density of a certain area of ​​the electrode is poor, the amount of slurry entering the corresponding first cavity 111 can be adjusted by the flow regulating component 30 on the corresponding feed pipe 20, thereby adjusting the coating surface density of the electrode corresponding to the feeding path. The response is fast, improving the timeliness of the adjustment of the coating surface density of the electrode, and making the coating surface density of the produced electrode more consistent.

[0053] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An electrode sheet coating device having a first direction (X) and a second direction (Y) perpendicular to each other, characterized by, include: A coating die (10) is provided with a discharge port (101). The coating die (10) is provided with a plurality of cavity groups (11) spaced apart along the first direction (X). The cavity group (11) includes a first cavity (111) and a second cavity (112) arranged and connected along the second direction (Y). The second cavity (112) is connected to the discharge port (101). Multiple feed pipes (20) are provided, each feed pipe (20) corresponding one-to-one with the cavity group (11) and respectively connected to the first cavity (111); and A coating component (40) is used to carry the electrode sheet and is disposed opposite to the discharge port (101) in the second direction (Y).

2. The pole piece coating apparatus according to claim 1, characterized by Also includes: A flow regulating component (30) is provided on the feed pipe (20) for regulating the flow rate entering the first cavity (111); The testing mechanism (50) is located downstream of the coating member (40) and is used to test the surface density of the electrode coating after passing through the coating member (40).

3. The pole piece coating apparatus of claim 2, wherein It also includes a controller, and the flow regulator (30) and the detection mechanism (50) are electrically connected to the controller. The controller is used to receive data from the detection mechanism (50) and send regulation commands to the flow regulator (30).

4. The pole piece coating apparatus of claim 1, wherein The first cavity (111) has a dimension of W1 along the second direction (Y), and the second cavity (112) has a dimension of W2 along the second direction (Y). W1 and W2 satisfy: W1>W2.

5. The pole piece coating apparatus according to claim 1 or 4, characterized by The first cavity (111) has a dimension of L1 along the first direction (X), and the second cavity (112) has a dimension of L2 along the first direction (X). L1 and L2 satisfy: L1 = L2.

6. The pole piece coating apparatus of claim 1, wherein The coating die (10) includes an upper die (12), a lower die (13), and a gasket (14). The upper die (12) is connected to the lower die (13) and forms a plurality of cavity groups (11). The gasket (14) is sandwiched between the upper die (12) and the lower die (13), and the gasket (14) is at least partially located between two adjacent cavity groups (11) to space them apart. A gap is formed between one end of the upper die (12) along the second direction (Y) and one end of the lower die (13) along the same direction to form the discharge port (101).

7. The pole piece coating apparatus of claim 6, wherein The lower surface of the upper mold (12) extends along the second direction (Y) and is provided with a first protruding edge (121), and the upper surface of the lower mold (13) extends along the second direction (Y) and is provided with a second protruding edge (131), and the gap between the first protruding edge (121) and the second protruding edge (131) forms the gap.

8. The pole piece coating apparatus of claim 1, wherein The coating die head (10) is also provided with a plurality of feed ports (102), which are spaced apart along the first direction (X). The plurality of feed ports (102) are connected to the plurality of first cavities (111) one by one, and the feed pipe (20) is connected to the feed ports (102).

9. The pole piece coating apparatus of claim 8, wherein The feed inlet (102) has a first central axis (1021), and the first cavity (111) has a second central axis (1111) parallel to the second direction (Y). The first central axis (1021) and the second central axis (1111) are collinear.

10. The pole piece coating apparatus of claim 1, wherein It also includes a feed manifold (60), the first end (601) of which is connected to each of the feed pipes (20), and the second end (602) of which is used to connect to the feeding system.

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