Coating die head assembly and coating system of battery pole piece

Abstract

The utility model relates to a coating die head assembly of a battery pole piece and a coating system. The coating die head assembly of the battery pole piece comprises an upper die, a lower die assembly and a gasket, wherein the gasket is clamped between the upper die and the lower die assembly; the lower die assembly comprises a lower die and a die body; the lower die is provided with an accommodating cavity; the mold body is detachably arranged in the containing cavity, the mold body is provided with a plurality of mold cavities arranged at intervals, and communicating holes corresponding to the mold cavities are formed in the mold body; the lower die is provided with a feeding hole corresponding to each die cavity; the gasket is provided with a discharging cavity corresponding to each die cavity; and the feeding hole, the communicating hole, the die cavity and the discharging cavity corresponding to the same die cavity are communicated in sequence. According to the scheme provided by the invention, the consistency of the surface density of coating can be improved, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery manufacturing, and in particular to a coating die assembly and coating system for battery pole pieces. Background Art

[0002] The production of lithium-ion battery pole pieces requires a coating process to apply slurry to the pole pieces. Currently, the feeding system for pole piece coating uses a single screw pump for quantitative feeding. After passing through a filter element, the slurry enters the die cavity through a single feed port of the coating die. After being divided in the cavity, the slurry flows out through the die lip, achieving quantitative and continuous coating.

[0003] However, the coating die in the related art still has the problem of poor consistency in coating surface density, especially when the coating width is wide, the surface density consistency of the coating slurry will deteriorate significantly; at the same time, for some different models of products, different slurries need to be coated, and the slurry and the coating die have a high degree of adaptability. When the coated slurry is different, a different coating die needs to be replaced. Therefore, the production line needs to have a variety of coating die heads for replacement, which increases production costs. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a coating die assembly and a coating system for battery pole pieces, which can improve the consistency of the coating surface density and reduce production costs.

[0005] In a first aspect, the present application provides a coating die assembly for a battery electrode, comprising: an upper die, a lower die assembly, and a gasket, wherein the gasket is sandwiched between the upper die and the lower die assembly;

[0006] The lower mold assembly includes a lower mold and a mold body;

[0007] The lower mold is provided with an accommodating cavity;

[0008] The mold body is detachably arranged in the accommodating cavity, and the mold body is provided with a plurality of mold cavities arranged at intervals, and a communication hole is provided on the mold body corresponding to each mold cavity;

[0009] The lower mold is provided with a feed port corresponding to each mold cavity;

[0010] The gasket is provided with a discharge cavity corresponding to each of the mold cavities;

[0011] The feed port, the communicating hole, the mold cavity and the discharge cavity corresponding to the same mold cavity are connected in sequence.

[0012] Furthermore, the mold body is provided in a plurality of types, and each type of the mold body can be provided in the accommodating cavity;

[0013] The gasket is provided as one or more types; each mold body is used in conjunction with one type of gasket, or each mold body is selectively used in conjunction with any one of the multiple gaskets; each gasket can be provided between the upper mold and the mold body used in conjunction with it.

[0014] Furthermore, the feed inlet is provided in multiple numbers;

[0015] One or more communicating holes are provided on any one of the mold cavities of any one of the mold bodies;

[0016] All the communicating holes on any one of the mold bodies can be connected to the feed ports in a one-to-one correspondence; or

[0017] All the mold cavities on any one of the mold bodies can be connected to the feed ports in a one-to-one correspondence.

[0018] Furthermore, the upper end of the accommodating cavity has an opening for the mold body to enter or exit the accommodating cavity;

[0019] The gasket cover is arranged on the upper side of the mold body and the upper side of the lower mold, and the upper mold cover is arranged on the upper side of the gasket (;

[0020] The gasket includes a rear gasket strip, on which a plurality of side gasket strips are spaced apart, and two adjacent side gasket strips are relatively located on the left and right sides of the corresponding mold cavity; the two adjacent side gasket strips and the rear gasket strip enclose the discharge cavity with a front end opening.

[0021] Furthermore, a threaded hole for connecting to a hanging ring is provided on the upper side of the mold body.

[0022] Furthermore, the lower mold is provided with a first positioning portion, and the mold body is provided with a second positioning portion, and the first positioning portion and the second positioning portion are clamped in the up and down directions.

[0023] Furthermore, the plurality of mold cavities are arranged along the length direction of the mold body, the communicating hole passes through the rear side wall of the mold body, and the feed port passes through the rear side wall of the lower mold.

[0024] Furthermore, it also includes a plug for blocking the feed port, and the plug is detachably connected to the lower mold.

[0025] Furthermore, the mold cavity includes a rear cavity and a front cavity located in front of the rear cavity, the rear cavity and the front cavity are spaced apart, the rear cavity is connected to the connecting hole and the rear section of the discharge cavity, and the front cavity is connected to the front section of the discharge cavity.

[0026] Furthermore, it also includes a blocking block, which is detachably embedded in the front cavity;

[0027] The blocking block (280) can fill the front cavity (2312); the upper surface of the blocking block (280) embedded in the front cavity (2312) is flush with the upper surface of the gasket.

[0028] The second aspect of the present application provides a battery electrode coating system, comprising: a feeding assembly and a battery electrode coating die assembly as described in any one of the above items, wherein the feeding assembly feeds material to each of the mold cavities through the feed port and the connecting hole respectively.

[0029] Furthermore, the feeding assembly includes a plurality of independently controllable feeding branches, and the feeding branches are arranged in a one-to-one correspondence with the feeding ports.

[0030] The technical solution provided by the present application may include the following beneficial effects: by arranging a mold body in the accommodating cavity of the lower mold, the mold body is provided with a plurality of mold cavities arranged at intervals, and the mold cavities are connected to the corresponding feed ports through connecting holes, so that each mold cavity has a separate feed port for feeding. By using a plurality of mold cavities arranged at intervals, the movement range of the slurry in the cavity along the coating width direction is shortened compared to a die head with only one cavity, and the pressure drop of the slurry in the die head cavity along the coating width direction is reduced, thereby significantly improving the consistency of the surface density of the slurry coating; at the same time, by arranging the mold body detachably in the accommodating cavity, when different slurries need to be coated, it is only necessary to disassemble the mold body for replacement, and there is no need to replace the entire coating die assembly, which reduces the investment cost of the equipment, thereby reducing the production cost, and is more convenient to disassemble and assemble during replacement.

[0031] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0033] Figure 1 This is a schematic structural diagram of a coating die assembly for a battery electrode according to an embodiment of the present application;

[0034] Figure 2 yes Figure 1 Schematic diagram of the decomposition;

[0035] Figure 3 is a schematic structural diagram of a mold body and a gasket according to another embodiment of the present application;

[0036] Figure 4 This is a schematic structural diagram of a mold body and a gasket shown in another embodiment of the present application.

[0037] Reference numerals:

[0038] 200-coating die assembly,

[0039] 210-upper mold,

[0040] 220-lower mold, 221-accommodating cavity, 222-feeding port, 223-first positioning portion,

[0041] 230-mold body, 231-mold cavity, 2311-back cavity, 2312-front cavity, 232-connecting hole, 233-threaded hole, 234-second positioning part,

[0042] 240-gasket, 241-rear pad, 242-side pad,

[0043] 250-rings,

[0044] 260-plug,

[0045] 270-screw,

[0046] 280-Block. DETAILED DESCRIPTION

[0047] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0048] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0050] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0051] The production of lithium-ion battery pole pieces requires a coating process to apply slurry to the pole pieces. Currently, the feeding system for pole piece coating uses a single screw pump for quantitative feeding. After passing through a filter element, the slurry enters the die cavity through a single feed port of the coating die. After being divided in the cavity, the slurry flows out through the die lip, achieving quantitative and continuous coating.

[0052] However, the single feed port and single cavity die used in the related art causes the slurry to be laterally diverted inside the die cavity after entering the cavity, that is, it flows along the width direction of the coating. The slurry will produce a pressure drop, resulting in poor consistency of the lateral surface density of the coated slurry. In order to improve production efficiency, multi-strip coating is usually required, which will increase the coating width and the size of the die cavity will also increase accordingly. The lateral flow range of the slurry in the cavity is larger, and the surface density consistency of the coated slurry will be significantly deteriorated.

[0053] At the same time, some different types of products need to be coated with different slurries, and the design of the die cavity is highly compatible with the rheological curve of the slurry. When the coated slurries are different, different coating die heads need to be replaced on the production line. Therefore, the production line needs to purchase a variety of coating die heads in advance for replacement to adapt to the product change production. The price of a single die head can be as high as 20W, which increases production costs.

[0054] In response to the above problems, an embodiment of the present application provides a coating die assembly 200 and a coating system for a battery electrode, which can improve the consistency of the coating surface density and reduce production costs.

[0055] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0056] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a coating die assembly 200 for a battery electrode, comprising an upper die 210, a lower die assembly and a gasket 240, wherein the gasket is sandwiched between the upper die 210 and the lower die assembly.

[0057] The lower mold assembly includes a lower mold 220 and a mold body 230; the lower mold 220 is provided with a receiving cavity 221; the mold body 230 is detachably disposed in the receiving cavity 221, the mold body 230 is provided with a plurality of mold cavities 231 arranged at intervals, and the mold body 230 is provided with a connecting hole 232 corresponding to each mold cavity 231; the lower mold 220 is provided with a feed port 222 corresponding to each mold cavity 231; and the gasket 240 is provided with a discharge cavity corresponding to each mold cavity 231;

[0058] The feed port 222 , the communicating hole 232 , the mold cavity 231 and the discharge cavity corresponding to the same mold cavity 231 are connected in sequence.

[0059] During coating, the feed pipe can be connected to the feed port 222 , and each feed port 222 can be connected to a pipe separately. The connecting hole 232 is connected to the feed port 222 , and the slurry enters the corresponding mold cavity 231 from the feed port 222 through the connecting hole 232 .

[0060] The gasket 240 is clamped between the upper mold 210 and the lower mold 220, that is, the upper mold 210 and the lower mold 220 clamp the gasket 240. The gasket 240 is used to form an outlet for the slurry during coating together with the upper mold 210 and the lower mold 220, so that the slurry flows out from one side of the coating die head assembly 200, that is, from the lip.

[0061] By arranging a mold body 230 within the accommodating cavity 221 of the lower mold 220, the mold body 230 is provided with a plurality of spaced mold cavities 231, and the mold cavities 231 are connected to the corresponding feed ports 222 through the connecting holes 232, so that each mold cavity 231 has a separate feed port 222 for feeding. By having a plurality of spaced mold cavities 231, the range of movement of the slurry in the cavity along the coating width direction is shortened compared to a die head having only one cavity, and the pressure drop of the slurry in the die head cavity along the coating width direction is reduced, thereby significantly improving the consistency of the surface density of the slurry coating, and maintaining the consistency of the coating surface density while increasing the coating width. The length of a single mold cavity 231 along the coating width direction is relatively short, which reduces the lateral pressure drop of the slurry in the mold cavity 231, which can also improve the compatibility of the coating die head assembly 200 with different slurries.

[0062] At the same time, by detachably arranging the mold body 230 in the accommodating cavity 221, when different slurries need to be coated, only the mold body 230 needs to be disassembled for replacement, and there is no need to replace the entire coating die head assembly 200, which reduces the investment cost of the equipment and thus reduces the production cost, and makes disassembly and assembly more convenient during replacement.

[0063] It should be noted that the direction of the coating width in the embodiment of the present application is the left-right direction in the diagram, that is, the horizontal direction in the embodiment of the present application. The orientation in the diagram of the embodiment of the present application is shown by the arrow in the diagram. The "multiple" in the embodiment of the present application means at least two.

[0064] In some embodiments, the mold body 230 is provided in multiple types, and each mold body 230 can be provided in the accommodating cavity 221; the gasket 240 is provided in one or more types; each mold body 230 is used in conjunction with a gasket 240, or each mold body 230 is selectively used in conjunction with any one of the multiple gaskets 240; each gasket 240 can be provided between the upper mold 210 and the mold body 230 used in conjunction with it.

[0065] An upper mold 210 and a lower mold 220 can match multiple mold bodies 230. Each mold body 230 is used in conjunction with a gasket 240, or each mold body 230 can be selectively used in conjunction with any one of multiple gaskets 240, which is suitable for coating different products. According to the needs of the coating product, the corresponding mold body 230 and gasket 240 can be selected for assembly.

[0066] In some embodiments, there are multiple feed ports 222; one or more connecting holes 232 are provided on any mold cavity 231 of any mold body 230; all connecting holes 232 on any mold body 230 can be connected to the feed ports 222 in a one-to-one correspondence; or, all mold cavities 231 on any mold body 230 can be connected to the feed ports 222 in a one-to-one correspondence.

[0067] In some embodiments, as Figure 1 and Figure 2 As shown, the upper end of the accommodating cavity 221 has an opening for the mold body 230 to enter or exit the accommodating cavity 221. A gasket 240 covers the upper side of the mold body 230 and the upper side of the lower mold 220, and the upper mold 210 covers the upper side of the gasket 240. The slurry in the mold cavity 231 can flow from the upper end of the accommodating cavity 221 to the coating port, i.e., the lip, between the upper and lower molds 210 and 220. The gasket 240 is located between the upper and lower molds 210 and 220, creating a gap between them, thereby forming the coating port. In the illustrated embodiment, the rear sides of the upper and lower molds 210 and 220 are hinged, allowing the upper mold 210 to open and close relative to the lower mold 220 to facilitate the removal of the mold body 230 and the gasket 240. The coating port is located on the front side of the coating die assembly 200.

[0068] Specifically, the mold body 230 can be inserted downwardly into the accommodating cavity 221 through the opening at the upper end of the accommodating cavity 221, or can be removed and replaced from the accommodating cavity 221 through the opening at the upper end of the accommodating cavity 221. When the mold body 230 is installed in the accommodating cavity 221, the upper end surface of the mold body 230 can be flush with the upper end surface of the lower mold 220, that is, located on the same plane. This ensures that the slurry flows through the plane when it flows out of the coating port, thereby ensuring fluidity.

[0069] In some embodiments, as Figure 2 As shown, the upper surface of the mold body 230 is provided with a threaded hole 233 for connecting to the lifting ring 250. The lifting ring 250 can be detachably connected to the threaded hole 233. When the mold body 230 needs to be removed, the lifting ring 250 is installed in the threaded hole 233 and then the mold body 230 is lifted. Similarly, the mold body 230 can be lowered into the accommodating cavity 221 through the lifting ring 250, and then the lifting ring 250 can be removed from the threaded hole 233.

[0070] In some embodiments, as Figure 2 As shown, the gasket 240 includes a rear gasket 241, on which a plurality of side gaskets 242 are spaced apart. Two adjacent side gaskets 242 are located on the left and right sides of the corresponding mold cavity 231. The two adjacent side gaskets 242 and the rear gasket 241 enclose a discharge cavity with an open front end. Specifically, the gasket 240 can be an integrally molded structure, with the side gaskets 242 and the rear gasket 241 arranged perpendicularly. When the upper mold 210 and the lower mold 220 clamp the gasket 240, the slurry in the mold cavity 231 flows from the opening at the upper end of the mold cavity 231 to the area between the two adjacent side gaskets 242, and then flows out from the opening between the front ends of the two adjacent side gaskets 242 and is coated on the electrode.

[0071] In some embodiments, as Figure 2 As shown, the lower mold 220 is provided with a first positioning portion 223, and the mold body 230 is provided with a second positioning portion 234. The first positioning portion 223 and the second positioning portion 234 are engaged in the vertical direction. The first positioning portion 223 can be a retaining groove, and the second positioning portion 234 can be a flange embedded in the retaining groove. The cooperation between the flange and the retaining groove ensures that the mold body 230 is accurately positioned in the accommodating cavity 221, ensuring positioning accuracy. Threaded holes 233 can be provided on the flanges on the left and right sides of the mold body 230 to facilitate lifting, and the provision of threaded holes 233 does not affect the flow of the slurry.

[0072] In some embodiments, as Figure 1 and Figure 2As shown, multiple mold cavities 231 are arranged along the length direction of the mold body 230, wherein the length direction of the mold body 230 is the left-right direction in the figure, the connecting hole 232 passes through the rear side wall of the mold body 230, so that the connecting hole 232 is connected to the mold cavity 231, and the feed port 222 passes through the rear side wall of the lower mold 220, so that the feed port 222 is connected to the accommodating cavity 221.

[0073] Specifically, Figure 1 and Figure 2 In the illustrated embodiment, there are two mold cavities 231, each having a communication hole 232, each of which communicates with a feed port 222. To accommodate a mold body 230 having more mold cavities 231, the lower mold 220 is provided with more than two feed ports 222; in the illustrated embodiment, five feed ports 222 are provided. This allows the lower mold 220 to accommodate mold bodies 230 having a different number of mold cavities 231.

[0074] When the number of feed inlets 222 exceeds the number of cavities in the upper mold 210 of the mold body 230 within the accommodating cavity 221, the feed inlets 222 not connected to the connecting holes 232 can be blocked. In some embodiments, the battery electrode coating die assembly 200 further includes a plug 260 for blocking the feed inlets 222. The plug 260 is detachably connected to the lower mold 220. Specifically, the plug 260 is detachably connected to the lower mold 220 via a screw 270. The plug 260 is provided with a through hole for the screw 270 to pass through, and the lower mold 220 is provided with a screw hole for connecting with the screw 270.

[0075] Figure 3 FIG. 2 is a structural diagram of a mold body 230 and a gasket 240 shown in another embodiment of the present application. Figure 3 As shown, in some embodiments, the mold body 230 has three mold cavities 231 arranged in a transversely spaced relationship, and correspondingly, the gasket 240 has four side gasket strips 242 .

[0076] Figure 4 FIG. 2 is a structural diagram of a mold body 230 and a gasket 240 shown in another embodiment of the present application. Figure 4 As shown, in some embodiments, the mold cavity 231 includes a rear cavity 2311 and a front cavity 2312 located in front of the rear cavity 2311, the rear cavity 2311 is connected to the connecting hole 232 and the rear section of the discharge cavity, and the front cavity 2312 is connected to the front section of the discharge cavity.

[0077] By making the mold cavity 231 a dual-cavity structure with a front cavity 2312 and a rear cavity 2311, the dual-cavity mold cavity 231 is more suitable for continuous coating under high-speed conditions. The slurry enters from the rear cavity 2311, and then passes through the front cavity 2312 to be coated on the electrode. The front cavity 2312 can be used to slow down the flow rate of the slurry and play a buffering role to prevent the slurry from flowing too fast and causing uneven coating and abnormalities.

[0078] In some embodiments, as Figure 4 As shown, the coating die assembly 200 further includes a block 280, which is detachably embedded in the front cavity 2312. Specifically, the front cavity 2312 is blocked by the block 280, so that Figure 4 The mold cavity 231 shown in the figure is a single-cavity operation. In this case, the coating die assembly 200 is more suitable for intermittent coating at low speeds and can solve the coating tailing phenomenon.

[0079] In some embodiments, the block 280 can fill the front cavity 2312 ; the upper surface of the block 280 embedded in the front cavity 2312 is flush with the upper surface of the gasket.

[0080] An embodiment of the present application also provides a battery electrode coating system, including a feeding assembly and a battery electrode coating die assembly 200 as described in any of the above embodiments, wherein the feeding assembly feeds material to each mold cavity 231 through a feed port 222 and a connecting hole 232 .

[0081] In some embodiments, the feeding assembly includes a plurality of independently controllable feeding branches, and the feeding branches are arranged in a one-to-one correspondence with the feeding ports 222 .

[0082] In summary, the embodiment of the present application provides a coating die assembly 200 and a coating system for a battery electrode. By providing a plurality of spaced-apart die cavities 231 in the die body 230, wide-width coating is decomposed into a single-strip coating method, shortening the lateral movement of the slurry in the die cavity 231, significantly improving the lateral surface density consistency of the slurry, meeting the requirements of multi-strip coating, and also greatly improving the compatibility with different slurries. By detachably arranging the die body 230 in the accommodating cavity 221, when different slurries need to be coated, only the die body 230 needs to be disassembled for replacement, and there is no need to replace the entire coating die assembly 200, which reduces the investment cost of the equipment, thereby reducing the production cost, and is more convenient to disassemble and assemble than to replace the entire slurry.

[0083] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for this application. In addition, it is understood that the steps in the method of the embodiment of the present application can be adjusted in sequence, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0084] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A coating die assembly (200) for a battery electrode, comprising an upper die (210), a lower die assembly, and a gasket (240), wherein the gasket is sandwiched between the upper die (210) and the lower die assembly; characterized in that: The lower mold assembly includes a lower mold (220) and a mold body (230); The lower mold (220) is provided with a receiving cavity (221); The mold body (230) is detachably disposed in the accommodating cavity (221), the mold body (230) is provided with a plurality of mold cavities (231) arranged at intervals, and a communication hole (232) is provided on the mold body (230) corresponding to each mold cavity (231); The lower mold (220) is provided with a feed port (222) corresponding to each mold cavity (231); The gasket (240) is provided with a discharge cavity corresponding to each of the mold cavities (231); The feed port (222), the communicating hole (232), the mold cavity (231) and the discharge cavity corresponding to the same mold cavity (231) are connected in sequence.

2. The battery electrode coating die assembly (200) according to claim 1, characterized in that: The mold body (230) is provided in a plurality of types, and each type of the mold body (230) can be provided in the accommodating cavity (221); The gasket (240) is provided as one or more types; each mold body (230) is used in conjunction with one type of gasket (240), or each mold body (230) is selectively used in conjunction with any one type of gasket (240); each gasket (240) can be provided between the upper mold (210) and the mold body (230) used in conjunction with it.

3. The battery electrode coating die assembly (200) according to claim 2, characterized in that: The feed inlet (222) is provided in a plurality; One or more communicating holes (232) are provided on any one of the mold cavities (231) of any one of the mold bodies (230); All the communicating holes (232) on any one of the mold bodies (230) can be connected to the feed ports (222) in a one-to-one correspondence; or, All the mold cavities (231) on any one of the mold bodies (230) can be connected to the feed ports (222) in a one-to-one correspondence.

4. The battery pole piece coating die assembly (200) according to claim 1, characterized in that: The upper end of the accommodating cavity (221) has an opening for the mold body (230) to enter or exit the accommodating cavity (221); The gasket (240) is covered on the upper side of the mold body (230) and the upper side of the lower mold (220), and the upper mold (210) is covered on the upper side of the gasket (240); The gasket (240) includes a rear gasket strip (241), and a plurality of side gasket strips (242) are arranged on the rear gasket strip (241) at intervals, and two adjacent side gasket strips (242) are relatively located on the left and right sides of the corresponding mold cavity (231); the two adjacent side gasket strips (242) and the rear gasket strip (241) enclose the discharge cavity with a front end opening.

5. The battery pole piece coating die assembly (200) according to claim 1, characterized in that: The upper side of the mold body (230) is provided with a threaded hole (233) for connecting with the hanging ring (250).

6. The battery pole piece coating die assembly (200) according to claim 1, characterized in that: The lower mold (220) is provided with a first positioning portion (223), and the mold body (230) is provided with a second positioning portion (234). The first positioning portion (223) and the second positioning portion (234) are clamped in the up-down direction.

7. The battery pole piece coating die assembly (200) according to claim 1, characterized in that: The plurality of mold cavities (231) are arranged along the length direction of the mold body (230), the communicating hole (232) passes through the rear side wall of the mold body (230), and the feed port (222) passes through the rear side wall of the lower mold (220).

8. The battery pole piece coating die assembly (200) according to claim 1, characterized in that: It also includes a plug (260) for plugging the feed port (222), and the plug (260) is detachably connected to the lower mold (220).

9. The battery pole piece coating die assembly (200) according to claim 1, characterized in that: The mold cavity (231) includes a rear cavity (2311) and a front cavity (2312) located in front of the rear cavity (2311), the rear cavity (2311) and the front cavity (2312) are arranged at intervals, the rear cavity (2311) is connected to the connecting hole (232) and the rear section of the discharge cavity, and the front cavity (2312) is connected to the front section of the discharge cavity.

10. The battery pole piece coating die assembly (200) according to claim 9, characterized in that: Also included is a blocking block (280), wherein the blocking block (280) is detachably embedded in the front cavity (2312); The blocking block (280) can fill the front cavity (2312); the upper surface of the blocking block (280) embedded in the front cavity (2312) is flush with the upper surface of the gasket.

11. A coating system for battery pole pieces, characterized in that: include: A feeding assembly and a coating die assembly (200) for a battery electrode as claimed in any one of claims 1 to 9, wherein the feeding assembly feeds material to each of the die cavities (231) through the feed port (222) and the connecting hole (232).

12. The battery electrode coating system according to claim 11, characterized in that: The feeding assembly includes a plurality of independently controllable feeding branches, and the feeding branches are arranged in a one-to-one correspondence with the feeding ports (222).

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