Coating die head and lithium battery coating device

Abstract

The embodiment of the utility model provides a coating die head and a lithium battery coating device. The coating die head comprises a first die head; the second die head is stacked on the first die head, and a containing cavity is defined by the first die head and the second die head; the second die head is provided with a containing groove penetrating through the second die head in the third direction, a gap is formed between the end, in the second direction, of the first die head and the end, in the same direction, of the second die head to form a gluing opening, the gluing opening communicates with the containing cavity, and the gasket is arranged between the first die head and the second die head and comprises a body and a plurality of protruding parts; the multiple protruding parts are arranged at intervals in the first direction, a glue discharging channel is formed between every two adjacent protruding parts, the glue discharging channels communicate with the uncovered part of the containing groove, the unblocked part of the gluing opening and the filling block, and the filling block is arranged in the containing groove and corresponds to at least one protruding part in the third direction. According to the coating die head provided by the embodiment of the invention, the coating uniformity can be improved, and the coating quality is further improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery manufacturing equipment, and particularly relates to a coating die and a lithium battery coating device. BACKGROUND

[0002] In the production process of a lithium battery, a coating process is one of key processes for producing a lithium battery pole piece, and the quality of coating greatly determines important parameters such as the capacity and voltage of the lithium battery, and the uniformity of the slurry coating thickness is an important embodiment of the coating quality.

[0003] In the related art, a coating die for coating a lithium battery pole piece mainly comprises a lower die, a gasket and an upper die, a cavity is arranged in the lower die to accommodate slurry, the gasket is located between the upper die and the lower die, and the gasket is used to adjust the size of a discharge port to coat pole pieces of different specifications. Since the length of the cavity of the lower die is constant, the coating of pole pieces of different specifications is usually realized by changing the size of the gasket itself. However, the change of the size of the gasket will cause the cavity of the lower die to have an excess cavity, and the slurry will form accumulation and dryness in the excess cavity, forming blocky slurry, which will affect the uniformity of coating and reduce the coating quality. CONTENT OF THE INVENTION

[0004] The application aims to provide a coating die and a lithium battery coating device to solve the problem that the existing coating die affects the uniformity of coating and reduces the coating quality.

[0005] To solve the above technical problems, the application is implemented as follows:

[0006] In a first aspect, the application discloses a coating die for coating a pole piece, the coating die having a first direction, a second direction and a third direction intersecting with each other, and the coating die comprising:

[0007] a first die;

[0008] a second die stacked on one side of the first die along the third direction, and the first die and the second die enclosing a containing cavity; the second die having a containing groove penetrating through the second die along the third direction, and the containing groove being communicated with the containing cavity and extending along the first direction;

[0009] a gap between one end of the first die along the second direction and one end of the second die along the same direction to form a glue discharge port, and the glue discharge port being communicated with the containing cavity

[0010] A gasket is arranged between the first die and the second die, the gasket comprising a body and a plurality of protrusions connected to one side of the body along the second direction towards the glue outlet; the protrusions cover a portion of the accommodating groove along the third direction and extend along the second direction to seal a portion of the glue outlet; the plurality of protrusions are arranged along the first direction with glue discharge channels formed between two adjacent protrusions, the glue discharge channels connecting the uncovered portion of the accommodating groove and the unsealed portion of the glue outlet.

[0011] A filling block is arranged in the accommodating groove and corresponds to at least one of the protrusions along the third direction.

[0012] Optionally, the portion of the accommodating groove covered by the protrusions is a to-be-filled portion, the to-be-filled portion being located at least at one end of the accommodating groove along the first direction, and the to-be-filled portion is provided with the filling block.

[0013] Optionally, the to-be-filled portion is two and is located at opposite ends of the accommodating groove along the first direction, and the two to-be-filled portions are provided with the filling block.

[0014] Optionally, one end of the filling block along the third direction abuts against the protrusion, and the filling block is detachably arranged in the accommodating groove.

[0015] Optionally, the filling block comprises a magnetic member arranged in the accommodating groove and used for magnetically attracting the filling block in the accommodating groove.

[0016] Optionally, the filling block further comprises a cladding member cladded on the outside of the magnetic member and abutting against the protrusion.

[0017] Optionally, the cladding member is a silica gel cladding member.

[0018] Optionally, the filling block is clamped in the accommodating groove.

[0019] Optionally, the length of at least one of the protrusions along the first direction X is a, and the length of the filling block along the first direction X is b, and the a and the b satisfy: b≤a.

[0020] In a second aspect, the application further discloses a lithium battery coating device, comprising the coating die of any one of the above.

[0021] In the embodiment of the present application, by arranging the filling block in the space corresponding to the at least one protruding part of the gasket in the third direction in the accommodating groove, the excess cavity in the accommodating groove is eliminated, the flowability of the coating paste in the coating die is improved, the accumulation and drying of the coating paste are reduced, and the uniformity of the paste in the coating process is improved, and the overall coating quality is improved.

[0022] Additional aspects and advantages of the present application will be made apparent from the following description of embodiments of the present application, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is one of the structure schematic diagrams of the coating die according to the embodiment of the present application;

[0025] Figure 2 is the structure schematic diagram of the filling block of the coating die according to the embodiment of the present application;

[0026] Figure 3 is Figure 2 the top view of the filling block shown in

[0027] Figure 4 is Figure 2 the side view of the filling block shown in

[0028] Figure 5 is Figure 2 the front view of the filling block shown in

[0029] Figure 6 is the second structure schematic diagram of the coating die according to the embodiment of the present application.

[0030] Reference signs: 1 - first die; 10 - accommodating cavity; 11 - glue coating port; 2 - second die; 20 - accommodating groove; 21 - part to be filled; 3 - gasket; 30 - body; 31 - protruding part; 32 - glue discharging channel; 4 - filling block; 40 - magnetic part; 41 - cladding part, X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The embodiment of the present application provides a coating die, specifically, the coating die is applied to a lithium battery coating device, and in actual application, the lithium battery coating device is used for coating the pole piece of the lithium battery. The coating die in the embodiment of the present application will be described in detail below with reference to the drawings.

[0036] Referring to Figures 1-6 , Figure 1 A structure schematic diagram of a coating die according to an embodiment of the present application is shown.Figures 3-4 respectively show a structure diagram of a filling block 4 of a coating die according to the embodiments of the present application; refer to Figure 6 show a structure diagram of a gasket 3 and a pole piece in a coating process of a coating die according to the embodiments of the present application.

[0037] As Figure 1 shown, the embodiments of the present application disclose a coating die, which comprises a first die 1, a second die 2 stacked on one side of the first die 1 along a third direction Z, and the first die 1 and the second die 2 form a containing cavity 10, the second die 2 has a containing groove 20 penetrating through the second die 2 along the third direction Z, the containing groove 20 is communicated with the containing cavity 10 and extends along a first direction X, the first die 1 and the second die 2 have a gap between one end of the first die 1 along a second direction Y and one end of the second die 2 along the same direction to form a glue outlet 11, the glue outlet 11 is communicated with a gasket 3 arranged between the first die 1 and the second die 2, the gasket 3 comprises a body 30 and a plurality of protruding parts 31 connected to one side of the body 30 along the second direction Y towards the glue outlet 11, the protruding parts 31 cover part of the containing groove 20 along the third direction Z and extend along the second direction Y to block part of the glue outlet 11, the plurality of protruding parts 31 are arranged at intervals along the first direction X, and a glue discharging channel 32 is formed between two adjacent protruding parts 31, the glue discharging channel 32 is communicated with the part of the containing groove 20 not covered and the part of the glue outlet 11 not blocked, and a filling block 4 is arranged in the containing groove 20 and corresponds to at least one protruding part 31 along the third direction Z.

[0038] Specifically, the first direction X is the length direction of the coating die, as shown by the X direction in Figure 1 and Figure 2 , the second direction Y is the width direction of the coating die, as shown by the Y direction in Figure 1 , and the third direction Z is the height direction of the coating die, as shown by the Z direction in Figure 1 , and the above three directions are still applicable in subsequent embodiments.

[0039] The coating die comprises the first die 1 and the second die 2, the first die 1 and the second die 2 are stacked along the third direction Z, the first die 1 and the second die 2 form the containing cavity 10, the second die 2 has the containing groove 20 along the first direction X, the containing groove 20 is used for containing the coating slurry, the containing groove 20 is communicated with the containing cavity 10, so that the coating slurry in the containing groove 20 can flow into the containing cavity 10.

[0040] Further, in order to enable the coating slurry to be injected into the accommodating cavity 10 from outside, a feeding channel can be arranged on the second die 2, which is in communication with the accommodating groove 20, and an external pipeline can be connected with the feeding channel, so that the coating slurry can enter the accommodating groove 20. The specific structure and shape of the feeding channel can refer to the prior art, and will not be described here.

[0041] The first die 1 and the second die 2 have a gap in the third direction Z at one end in the second direction Y, which forms a glue outlet 11, which is in communication with the accommodating cavity 10, so that the coating slurry in the accommodating cavity 10 can flow out of the glue outlet 11.

[0042] The gasket 3 is arranged between the first die 1 and the second die 2 and is located in the accommodating cavity 10. The gasket 3 comprises a body 30 and a plurality of protruding portions 31 connected to one side of the body 30 facing the glue outlet 11 and extending in the second direction Y, so that the protruding portions 31 cover part of the accommodating groove 20 and the glue outlet 11. The plurality of protruding portions 31 are arranged at intervals in the first direction X, and two adjacent protruding portions 31 define a glue discharging channel 32, which is in communication with the part of the accommodating groove 20 and the glue outlet 11 not covered by the protruding portions 31, and the coating slurry can flow out of the glue discharging channel 32 to coat the pole piece. By adjusting the distance between the two adjacent protruding portions 31 on the gasket 3 in the first direction X, i.e. changing the size of the glue discharging channel 32 in the first direction X, the coating of pole pieces with different coating widths can be adapted, and the practicability of the coating die is improved. Further, the body 30 and the protruding portions 31 can be integrally formed, so that the gasket 3 is easier to manufacture, and the cost of the coating die is reduced.

[0043] In actual application, in order to coat the pole piece with different width, the distance between two adjacent convex parts 31 needs to be changed, at this time, the accommodating groove 20 and at least one cavity corresponding to the convex part 31 in the third direction Z are redundant cavities, in the coating process, the flow rate of the coating paste in the redundant cavities is slow, and it is easy to form a stagnant zone, which will cause accumulation in the redundant cavities, and with the passage of time, the accumulation will dry and form a blocky paste, and the larger blocky paste can block the glue discharging channel 32, resulting in uneven paste flow, so that the thickness of the coating layer is inconsistent, which affects the uniformity of the coating. Smaller blocky paste flows out of the glue discharging channel 32 during the coating process, and is coated on the surface of the pole piece to form irregular protrusions or spots, which also affect the flatness and uniformity of the pole piece, and reduce the coating quality. In the embodiment of the present application, by arranging the filling block 4 in the space corresponding to the at least one convex part 31 of the gasket 3 in the third direction Z in the accommodating groove 20, the redundant cavities in the accommodating groove 20 are eliminated, the flowability of the coating paste in the coating die is improved, the accumulation and drying of the coating paste are reduced, and the uniformity of the paste in the coating process is improved, and the overall coating quality is improved.

[0044] In some optional embodiments, the part of the accommodating groove 20 covered by the convex part 31 is the to-be-filled part 21, and the to-be-filled part 21 is located at least at one end of the accommodating groove 20 in the first direction X, and the filling block 4 is arranged in the to-be-filled part 21.

[0045] As shown in Figure 1 , Figure 2 and Figure 6 , the accommodating groove 20 extends in the first direction X in the second die 2, and the shape of the cross section can be semicircular, rectangular, etc. In order to facilitate the description, the cavity covered by the convex part 31 in the accommodating groove 20 is defined as the to-be-filled part 21, and in the to-be-filled part 21, paste accumulation and drying are prone to occur. In actual application, the to-be-filled part 21 is located at least at one end of the accommodating groove 20 in the first direction X, corresponding to the convex part 31 at one end of the main body of the gasket 3 in the first direction X, and the cavity covered by the convex part 31 is the to-be-filled part 21, and the filling block 4 is arranged in the to-be-filled part 21. It can be understood that the shape of the filling block 4 is adapted to the shape of the to-be-filled part 21, so that the filling block 4 can be completely filled in the to-be-filled part 21.

[0046] It should be noted that the shape of the to-be-filled part 21 and the filling block 4 can be specifically set according to actual needs, Figure 1 and Figure 2 in the present application are only examples, and the embodiments of the present application do not make specific limitations on this.

[0047] In the embodiment, by arranging the filling block 4 in the to-be-filled part 21 located at one end of the containing groove 20 along the first direction X, the excess cavities in the containing groove 20 can be more accurately eliminated, so that the accumulation and drying of the slurry in these areas are further reduced, the thickness uniformity of the coating layer is improved, and the coating quality is further improved.

[0048] Further, the to-be-filled part 21 is two and is located at two opposite ends of the containing groove 20 along the first direction X, and the filling block 4 is arranged in each of the two to-be-filled parts 21.

[0049] As shown in Figure 1 and Figure 6 , the cavities where the slurry is prone to accumulate in the containing groove 20 are located at both sides of the containing groove 20 along the first direction X, that is, the to-be-filled part 21 is two and is located at both sides of the containing groove 20 along the first direction X. In actual application, when the to-be-filled part 21 is located at both sides, arranging the filling block 4 only at one side may cause uneven distribution of quality at both sides of the coating die, thereby causing imbalance of the coating die. Such imbalance may cause uneven flow of the slurry during coating, inconsistent thickness of the coating layer, and affect the uniformity and stability of coating. In the embodiment, by arranging the filling block 4 in both to-be-filled parts 21, on the one hand, most of the areas in the containing groove 20 where excess cavities are likely to be formed can be eliminated, thereby greatly reducing the risk of accumulation and drying of the slurry inside the entire containing groove 20, further improving the uniformity of the slurry during coating, and improving the overall coating quality. Moreover, arranging the filling block 4 at both sides makes the quality distribution at both sides of the coating die more uniform, avoids the imbalance problem caused by unilateral filling, and thereby can ensure uniform distribution of the slurry flow, make the thickness of the coating layer consistent, and further improve the uniformity and quality of coating.

[0050] In some embodiments, one end of the filling block 4 along the third direction Z abuts against the protruding part 31, and the filling block 4 is detachably arranged in the containing groove 20.

[0051] As shown in Figure 1 , specifically, the top surface of the filling block 4 along the third direction Z abuts against the bottom surface of the protruding part 31 along the third direction Z. In actual application, by abutting the filling block 4 against the protruding part 31, the filling block 4 and the protruding part 31 can be closely matched in the third direction Z, further reducing the excess cavities in the containing groove 20, reducing the accumulation and drying of the slurry, and improving the uniformity and quality of coating.

[0052] The filling block 4 is detachably arranged in the containing groove 20. In actual application, the detachable arrangement of the filling block 4 makes it more convenient and fast to clean or replace the filling block 4 when needed, without the need to disassemble the entire coating die, thereby reducing the disassembly process.

[0053] Optionally, the filling block 4 comprises a magnetic member 40 arranged in the accommodating groove 20 for magnetically attracting the filling block 4 in the accommodating groove 20.

[0054] As shown in Figure 3 and Figure 5 , the second die 2 can be made of metal material, and the filling block 4 comprises a magnetic member 40 which can be arranged on the outside or inside of the filling block 4. The filling block 4 can be magnetically attracted in the accommodating groove 20 through the magnetic member 40. In this way, the magnetic member 40 can make the filling block 4 quickly adhere to the accommodating groove 20 without the need for complex fixing devices, thereby improving the installation efficiency. The magnetic attraction generated by the magnetic member 40 can make the filling block 4 stably and firmly adhere to the accommodating groove 20, preventing the filling block 4 from sliding along the first direction X during work to affect the size of the coating, and ensuring the stability and reliability of the filling block 4. Moreover, when the filling block 4 needs to be replaced, the use of the magnetic member 40 makes the replacement process simpler and faster, reduces downtime, and improves production efficiency.

[0055] Optionally, the filling block 4 further comprises a cladding member 41 which is cladded on the outside of the magnetic member 40 and abuts against the protruding portion 31.

[0056] As shown in Figures 3-4 , the filling block 4 comprises a magnetic member 40 and a cladding member 41, wherein the magnetic member 40 can be a permanent magnet of any shape, and the cladding member 41 is completely cladded on the outside of the magnetic member 40. In actual application, during the coating process, friction may occur between the filling block 4 and the accommodating groove 20. When the magnetic member 40 directly contacts the accommodating groove 20, such friction will cause the magnetic member 40 to generate metal foreign matter, which not only affects the coating quality, but also may cause equipment failure and safety accidents after entering the coating device. By arranging the cladding member 41 on the outside of the magnetic member 40, the magnetic member 40 can be isolated from the accommodating groove 20, reducing the generation of metal foreign matter and avoiding the entry of these metal foreign matter into the slurry, thereby affecting the coating quality and equipment operation. Moreover, the cladding member 41 can also reduce the friction between the filling block 4 and the accommodating groove 20, thereby prolonging the service life of the second die 2.

[0057] Optionally, the cladding member 41 is a silica gel cladding member 41. In actual application, since silica gel material has good flexibility and elasticity, it can better use the shape change of the accommodating groove 20, so that the filling block 4 can be tightly filled in the accommodating groove 20, thereby further reducing the excess space in the accommodating groove 20 and improving the uniformity of the coating. Moreover, the high flexibility and elasticity of silica gel can make the cladding member 41 tightly fit on the outside of the magnetic member 40, ensuring that the magnetic member 40 is always wrapped during long-term use, thereby further reducing the generation of metal foreign matter.

[0058] In another alternative embodiment, the filling block 4 is clamped in the accommodating groove 20.

[0059] Specifically, one of the buckle or the clamping groove can be arranged on one side or multiple sides of the filling block 4, and the other one of the buckle or the clamping groove is arranged at the corresponding position of the accommodating groove 20, and the buckle is clamped in the clamping groove, so that the filling block 4 is clamped in the accommodating groove 20. In actual application, by clamping the filling block 4 in the accommodating groove 20, the filling block 4 can be quickly and conveniently installed in the accommodating groove 20 without using screws or other fixing tools, which improves the installation efficiency and makes the filling block 4 more firmly arranged in the accommodating groove 20, avoiding the influence of the sliding of the filling block 4 along the first direction X on the size of the coating during the work process, and ensuring the stability and reliability of the filling block 4.

[0060] Optionally, the length of the protruding part 31 along the first direction X is a, and the length of the filling block 4 along the first direction X is b, and the a and the b satisfy: b≤a.

[0061] As shown in Figure 6 , the structural relationship between the coating die and the pole piece in the embodiment of the present application is shown in Figure 6 , the white part in the upper half part in Figure 6 corresponds to the glue discharging channel 32, and the coating slurry in the accommodating groove 20 flows out from the glue discharging channel 32 between the two adjacent protruding parts 31 and is coated on the white area to form the pole piece. The protruding part 31 refers to the protruding part 31 corresponding to the filling block 4 arranged along the third direction Z among the plurality of protruding parts 31, and the length a of the protruding part 31 along the first direction X refers to the straight-line distance between the two side edges of the protruding part 31 along the first direction X. The length b of the filling block 4 along the first direction X refers to the straight-line distance between the two sides of the filling block 4 along the first direction X. In actual application, when the length b of the filling block 4 along the first direction X is greater than the length b of the protruding part 31 along the first direction X, the filling block 4 will exist in the area of the accommodating groove 20 for forming the tab, which will affect the size of the tab. By making: b≤a, appropriately reducing the length a of the filling block 4 along the first direction X so that it does not exceed the length b of the protruding part 31, it is ensured that the filling block 4 will not affect the size of the tab.

[0062] In summary, the coating die according to the embodiment of the present application can at least have the following advantages:

[0063] In the embodiment of the present application, by arranging the filling block 4 in the space corresponding to the third direction Z of the at least one protruding part 31 of the gasket 3 in the accommodating groove 20, the excess cavity in the accommodating groove 20 is eliminated, the flowability of the coating slurry in the coating die is improved, the accumulation and drying of the coating slurry are reduced, and the uniformity of the slurry in the coating process is improved, and the overall coating quality is improved.

[0064] The embodiment of the present application also provides a lithium battery coating device, which specifically can include the coating die of any one of the above-mentioned embodiments.

[0065] It should be noted that in the embodiment of the present application, the structure of the coating die is the same as that of the coating die in any one of the above-mentioned embodiments, and the beneficial effects are similar, which will not be repeated here.

[0066] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A coating die for coating an electrode tab, the coating die having a first direction (X), a second direction (Y) and a third direction (Z) intersecting two by two, characterized in that, The coating die comprises: a first die (1); a second die (2) stacked on one side of the first die (1) along the third direction (Z), and the first die (1) and the second die (2) form a containing cavity (10); the second die (2) has a containing groove (20) penetrating through it along the third direction (Z), and the containing groove (20) communicates with the containing cavity (10) and extends along the first direction (X); the first die (1) and the second die (2) have a gap between one end of the first die (1) along the second direction (Y) and one end of the second die (2) along the same direction to form a glue outlet (11), and the glue outlet (11) communicates with the containing cavity (10); a gasket (3) is arranged between the first die (1) and the second die (2), the gasket (3) comprises a body (30) and a plurality of protruding portions (31) connected to one side of the body (30) along the second direction (Y) towards the glue outlet (11); the protruding portion (31) covers part of the containing groove (20) in the third direction (Z), and extends along the second direction (Y) to block part of the glue outlet (11); a plurality of protruding portions (31) are arranged at intervals along the first direction (X), and a glue discharging channel (32) is formed between two adjacent protruding portions (31), and the glue discharging channel (32) communicates with the part of the containing groove (20) that is not covered and the part of the glue outlet (11) that is not blocked; and a filling block (4) is arranged in the containing groove (20) and corresponds to at least one protruding portion (31) along the third direction (Z).

2. The coating die of claim 1, wherein The part of the containing groove (20) covered by the protruding portion (31) is a to-be-filled part (21), and the to-be-filled part (21) is located at least at one end of the containing groove (20) along the first direction (X), and the filling block (4) is arranged in the to-be-filled part (21).

3. The coating die of claim 2, wherein, The to-be-filled part (21) is two and is located at opposite ends of the containing groove (20) along the first direction (X); the filling block (4) is arranged in each of the two to-be-filled parts (21).

4. The coating die of claim 1, wherein One end of the filling block (4) along the third direction (Z) abuts against the protruding portion (31), and the filling block (4) is detachably arranged in the containing groove (20).

5. The coating die of claim 4, wherein, The filling block (4) comprises a magnetic member (40) arranged in the containing groove (20) and used for magnetically attracting the filling block (4) in the containing groove (20).

6. The coating die of claim 5, wherein, The filling block (4) further comprises a cladding member (41) cladded on the outer side of the magnetic member (40) and abutting against the protruding portion (31).

7. The coating die of claim 6, wherein The cladding member (41) is a silica gel cladding member (41).

8. The coating die of claim 4, wherein, The filling block (4) is clamped in the containing groove (20).

9. The coating die of claim 1, wherein The length of at least one protruding portion (31) along the first direction (X) is a, the length of the filling block (4) along the first direction (X) is b, and the a and the b satisfy: b≤a.

10. A lithium battery coating apparatus characterized by, The application includes: A coating die according to any one of claims 1 to 9.

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