Pole piece cutting and chamfering die

Abstract

The invention discloses a pole piece cutting and chamfering die. The pole piece cutting and chamfering die comprises a die frame, a cutting die and a chamfering die, the cutting die and the chamfering die share a die frame, the die frame is composed of an upper die top plate, a first guide assembly and a lower die bottom plate, and the chamfering die comprises an upper remodeling plate, a lower remodeling plate, a second guide assembly, a first chamfering assembly, a second chamfering assembly and a third chamfering assembly. The male dies of the first chamfering assembly and the third chamfering assembly are installed on the upper reshaping plate, the female dies of the first chamfering assembly and the third chamfering assembly are fixed to the lower reshaping plate, the first chamfering assembly and the second chamfering assembly are matched to machine a first pole piece, the third chamfering assembly and the second chamfering assembly are reused to machine a second pole piece, synchronous cutting and chamfering are achieved, and repeated positioning errors are reduced. Through the split type upper / lower remodeling plate design, pole pieces of different specifications can be adapted only by replacing the corresponding remodeling plate, and the remodeling time is shortened. The cutting die and the chamfering die share the guide assembly and the die frame, the structure is simplified, and moving parts are reduced.

Description

Technical Field

[0001] The present application relates to the field of battery pole piece cutting dies, and particularly to a pole piece cutting and chamfering die. Background Art

[0002] In the manufacturing process of new energy devices such as lithium-ion batteries, the pole piece, as a core component, needs to go through multiple precision processing procedures such as cutting and chamfering. In traditional processing technologies, the cutting and chamfering of the pole piece usually need to be completed at independent workstations respectively, which has problems of scattered processes and poor positioning accuracy, and is likely to cause excessive burrs on the pole piece or dimensional deviation of the chamfer, affecting the yield rate of battery assembly. Especially for pole piece products with large differences in size specifications, the existing technologies mostly use two sets of independent dies to perform cutting and chamfering processing respectively, which not only increases the equipment investment cost, but also requires repeated disassembly of the dies during die change, consuming a large amount of debugging time.

[0003] Although the existing technologies have proposed a composite die structure integrating cutting and chamfering functions, its chamfering module adopts a fixed design and can only adapt to the processing of pole pieces of a single specification. When the product requirements change, the whole die still needs to be replaced, and multi-specification compatibility cannot be achieved through local die change. In addition, the existing chamfering modules generally adopt a single-group chamfering punch structure, and when synchronously processing double pole pieces, there are problems such as difficult adjustment of the chamfering angle and concentrated processing stress, which are difficult to meet the production requirements of high-precision battery pole pieces. Summary of the Invention

[0004] The purpose of the present application is to provide a pole piece cutting and chamfering die with both multi-specification rapid die change ability and high-precision double-pole piece synchronous processing function, so as to improve the processing efficiency and quality stability of battery pole pieces.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] A pole piece cutting and chamfering die, comprising a die frame, a cutting die and a chamfering die. The cutting die and the chamfering die are both installed on the die frame. The die frame includes an upper die top plate, a first guiding component and a lower die bottom plate. The upper die top plate is installed on the lower die bottom plate through the first guiding component. The upper dies of the cutting die and the chamfering die are both installed at the bottom of the upper die top plate, and the lower dies of the cutting die and the chamfering die are both installed at the top of the lower die bottom plate. The chamfering die includes an upper die change plate, a lower die change plate, a second guiding component, a first chamfering component, a second chamfering component and a third chamfering component. The punches of the first chamfering component, the second chamfering component and the third chamfering component are all installed on the upper die change plate. The upper die change plate is installed at the bottom of the upper die top plate. The dies of the first chamfering component, the second chamfering component and the third chamfering component are all installed on the lower die change plate. The first chamfering component cooperates with the second chamfering component to chamfer the first pole piece, and the third chamfering component cooperates with the second chamfering component to chamfer the second pole piece.

[0007] Further, the first chamfering component includes a first upper chamfering mounting plate, a first chamfering pressure plate, a first chamfering punch, a first chamfering die, and a first lower chamfering mounting plate. The first chamfering pressure plate and the first chamfering punch are both mounted on the first upper chamfering mounting plate. The first upper chamfering mounting plate is mounted on the upper die change plate. The first chamfering die is mounted on the first lower chamfering mounting plate. The first lower chamfering mounting plate is mounted on the lower die change plate.

[0008] Further, a first inclined relief groove is provided on the bottom surface of the first chamfering punch. A first air blowing hole is provided on the first inclined surface of the first inclined relief groove.

[0009] Further, a first blanking groove is provided on the first chamfering die. A first relief groove is provided on the side edge of the first blanking groove along the pole piece discharging direction.

[0010] Further, a second air blowing hole is provided on the inner wall of the first blanking groove.

[0011] Further, the cutting die includes a cutting upper template, a third guiding component, a cutting middle plate, a cutting bottom plate, an upper cutting knife, an upper pressure plate, a lower cutting knife, and a supporting platform. The cutting upper template is mounted on the cutting middle plate through the third guiding component. The cutting middle plate is mounted on the cutting bottom plate. The upper cutting knife and the upper pressure plate are mounted at the bottom of the cutting upper template. The lower cutting knife and the supporting platform are mounted on the cutting middle plate.

[0012] Further, a plurality of third air blowing holes are provided at intervals on the bottom of the upper cutting knife along the length direction of the upper cutting knife. The third air blowing holes are used for blowing dust downward.

[0013] Further, the lower cutting knife includes a cutting part and a dust removing part. The cutting part is located at the front side of the upper surface of the dust removing part. The dust removing part is provided with a plurality of first dust removing holes vertically downward.

[0014] Further, the supporting platform includes a supporting main board, a supporting sub-board, and a floating supporting component. The supporting sub-board is arranged on the supporting main board. The supporting main board is mounted on the cutting middle plate through the floating supporting component. The supporting main board includes a first dust removing groove, a second dust removing hole, and a first dust removing main channel. The second dust removing hole is horizontally arranged and communicated with the first dust removing groove. The second dust removing hole corresponds to the dust removing part. The first dust removing main channel is communicated with the first dust removing groove.

[0015] Further, a second dust removing groove is provided in the supporting sub-board. The second dust removing groove is horizontally arranged in the supporting sub-board, and the dust removing port of the second dust removing groove is close to the lower cutting knife. The second dust removing groove is communicated with the first dust removing groove.

[0016] The beneficial effects of this application are:

[0017] (1) This application processes the first pole piece through the cooperation of the first chamfering component and the second chamfering component, and the third chamfering component and the second chamfering component are reused to process the second pole piece, realizing "one-out-two" synchronous cutting and chamfering, reducing the error accumulation caused by multiple positionings in the traditional process, and improving the processing efficiency;

[0018] (2) This application adopts a split upper die-changing plate and lower die-changing plate structure. Only the corresponding die-changing plate needs to be replaced to adjust the layout and size of the chamfering component, without the need to replace the mold as a whole. The die-changing time is greatly shortened, and the cutting die remains fixed, avoiding repeated debugging of cutting parameters, significantly reducing the mold development cost and production management complexity;

[0019] (3) The cutting die and the chamfering die of this application share the die holder and the guiding component, simplifying the overall structure of the mold, reducing the number of key moving parts, reducing the equipment failure rate. At the same time, the modular design is convenient for local maintenance or upgrading, and prolongs the service life of the mold. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a one-out-two battery pole piece provided by an embodiment of this application;

[0021] Figure 2 It is a schematic structural diagram of a pole piece cutting and chamfering die provided by an embodiment of this application;

[0022] Figure 3 It is a schematic structural diagram of the pole piece cutting and chamfering die from another perspective provided by an embodiment of this application;

[0023] Figure 4 It is a cross-sectional view of the pole piece cutting and chamfering die provided by an embodiment of this application;

[0024] Figure 5 It is a schematic structural diagram of the chamfering die provided by an embodiment of this application;

[0025] Figure 6 It is a cross-sectional view of the chamfering die provided by an embodiment of this application;

[0026] Figure 7 It is a schematic structural diagram of the first chamfering punch provided by an embodiment of this application;

[0027] Figure 8 It is a schematic structural diagram of the first chamfering die provided by an embodiment of this application;

[0028] Figure 9 It is a schematic structural diagram of the first chamfering die provided by an embodiment of this application;

[0029] Figure 10 It is a cross-sectional view of the first chamfering die provided by an embodiment of this application;

[0030] Figure 11 Structural schematic diagram of the first chamfering pressure plate provided by an embodiment of the present application;

[0031] Figure 12 Structural schematic diagram of the cutting die provided by an embodiment of the present application;

[0032] Figure 13 Cross-sectional view of the cutting die provided by an embodiment of the present application;

[0033] Figure 14 Cross-sectional view of the cutting die from another perspective provided by an embodiment of the present application;

[0034] Figure 15 Structural schematic diagram of the lower cutting knife and the support platform provided by an embodiment of the present application;

[0035] Figure 16 Structural schematic diagram of the lower cutting knife and the support platform provided by an embodiment of the present application;

[0036] Figure 17 Cross-sectional view of the lower cutting knife and the support platform provided by an embodiment of the present application;

[0037] Explanation of reference numerals:

[0038] Q, pole piece;

[0039] 100, die set; 200, cutting die; 300, chamfering die; 400, handle; 500, material supporting plate;

[0040] 110, upper die top plate; 120, first guiding assembly; 130, lower die bottom plate;

[0041] 310, upper die change plate; 320, lower die change plate; 330, second guiding assembly; 340, first chamfering assembly; 350, second chamfering assembly; 360, third chamfering assembly;

[0042] 341, first chamfering upper mounting plate; 342, first chamfering pressure plate; 343, first chamfering punch; 344, first chamfering die; 345, first chamfering lower mounting plate;

[0043] 3431, first inclined relief groove; 3432, first air blowing hole;

[0044] 3441, first blanking groove; 3442, first relief groove; 3443, second air blowing hole;

[0045] 3421, first guide post; 3422, first return spring;

[0046] 210. Upper cutting template; 220. Third guiding component; 230. Middle cutting plate; 240. Bottom cutting plate; 250. Upper cutting knife; 260. Upper pressure plate; 270. Lower cutting knife; 280. Support platform;

[0047] 251. Third air blowing hole;

[0048] 271. Cutting part; 272. Dust removal part;

[0049] 2721. First dust removal hole; 2722. First flared opening;

[0050] 231. First dust removal channel; 232. First inclined surface;

[0051] 241. Second dust removal channel;

[0052] 281. Support main board; 282. Support sub-board; 283. Floating support component; 284. Air extraction and dust removal pipe;

[0053] 2811. First dust removal groove; 2812. Second dust removal hole; 2813. First main dust removal channel;

[0054] 2821. Second dust removal groove; Detailed implementation mode

[0055] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0056] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In particular, the understanding of the term "upper" following a noun in the claims should be understood that the entire inner and outer surfaces of the structure referred to by the noun conform to the definition of "upper".

[0057] The following will be described in detail the specific implementation mode, structure, features and functions provided according to the present application in conjunction with the accompanying drawings and preferred embodiments.

[0058] As Figure 1 shown, the cutting and chamfering of two rows of battery electrode sheets Q can be achieved at one time.

[0059] As Figure 2 , Figure 3 andFigure 4 As shown, a pole piece cutting and chamfering die includes a die holder 100, a cutting die 200 and a chamfering die 300. The cutting die 200 and the chamfering die 300 are both installed on the die holder 100. The die holder 100 includes an upper die top plate 110, a first guiding component 120 and a lower die bottom plate 130. The upper die top plate 110 is installed on the lower die bottom plate 130 through the first guiding component 120. The upper dies of the cutting die 200 and the chamfering die 300 are both installed at the bottom of the upper die top plate 110, and the lower dies of the cutting die 200 and the chamfering die 300 are both installed at the top of the lower die bottom plate 130.

[0060] As Figure 5 shown, the chamfering die 300 includes an upper die change plate 310, a lower die change plate 320, a second guiding component 330, a first chamfering component 340, a second chamfering component 350 and a third chamfering component 360. The punches of the first chamfering component 340, the second chamfering component 350 and the third chamfering component 360 are all installed on the upper die change plate 310. The upper die change plate 310 is installed at the bottom of the upper die top plate 110. The dies of the first chamfering component 340, the second chamfering component 350 and the third chamfering component 360 are all installed on the lower die change plate 320. The first chamfering component 340 cooperates with the second chamfering component 350 to chamfer the first pole piece, and the third chamfering component 360 cooperates with the second chamfering component 350 to chamfer the second pole piece.

[0061] As Figure 3 shown, in one embodiment, handles 400 are respectively arranged on both sides of the lower die bottom plate 130 to facilitate the handling of the entire die.

[0062] As Figure 6 shown, in one embodiment, the first chamfering component 340 includes a first chamfering upper mounting plate 341, a first chamfering pressure plate 342, a first chamfering punch 343, a first chamfering die 344 and a first chamfering lower mounting plate 345. The first chamfering pressure plate 342 and the first chamfering punch 343 are both installed on the first chamfering upper mounting plate 341. The first chamfering upper mounting plate 341 is installed on the upper die change plate 310. The first chamfering die 344 is installed on the first chamfering lower mounting plate 345. The first chamfering lower mounting plate 345 is installed on the lower die change plate 320.

[0063] The structure of the third chamfering component 360 is arranged in mirror symmetry with the first chamfering component 340. The third chamfering upper mounting plate, the third chamfering pressure plate, the third chamfering punch, the third chamfering die and the third chamfering lower mounting plate it includes are completely consistent with the first chamfering component 340 in terms of installation method, connection relationship and functional logic, and are only symmetrically distributed in space relative to the first chamfering component 340 to adapt to the chamfering processing requirements of the second pole piece.

[0064] The second chamfering component 350 is located between the first chamfering component 340 and the third chamfering component 360, and its structure is correspondingly adapted to the two. For example, the sizes and angle parameters of the punch and die of the second chamfering component 350 are designed according to the common chamfering requirements of the first pole piece and the second pole piece. Since the installation method, pressure plate and guiding structure of the second chamfering component 350 are similar to those of the first chamfering component 340, the detailed structure thereof will not be described in this embodiment.

[0065] In one embodiment, a first inclined relief groove 3431 is provided on the bottom surface of the first chamfering punch 343, and a first air blowing hole 3432 is provided on the first inclined surface of the first inclined relief groove 3431 for blowing off the cut waste. In this embodiment, a first inclined relief groove 3431 is machined on the bottom surface of the first chamfering punch 343, and the inclined surface of the groove forms a set angle (such as 30° - 60°) with the pole piece chamfering processing direction, and its inclination angle is designed according to the splash path of the waste after chamfering. A first air blowing hole 3432 is opened on the first inclined surface of the first inclined relief groove 3431, and the air blowing hole is communicated with an external compressed air source through an internal air passage. The guiding surface of the inclined relief groove and the angle of the air blowing hole are designed in coordination so that the air flow direction is consistent with the waste separation path, improving the chip removal efficiency and avoiding secondary pollution of the pole piece surface.

[0066] As Figure 8 and Figure 9 shown, in one embodiment, a first blanking groove 3441 is provided on the first chamfering die 344, and a first relief groove 3442 is opened along the pole piece discharging direction on the side edge of the first blanking groove 3441. The first relief groove 3442 is communicated with the first blanking groove 3441. The chamfering die 300 is provided with the first relief groove 3442 to prevent the side part of the pole piece from colliding with the side edge of the first blanking groove 3441 during movement and causing it to bend and be damaged.

[0067] As Figure 10 shown, in one embodiment, a second air blowing hole 3443 is provided on the inner wall of the first blanking groove 3441. The second air blowing hole 3443 is connected to an external air source through an internal air passage. After the chamfering process is completed, the second air blowing hole 3443 sprays air into the blanking groove to blow the waste into the bottom discharging channel, avoiding waste retention and causing the die to be blocked.

[0068] The second guiding component 330 is a guide pillar and guide sleeve component.

[0069] As Figure 11 shown, the first chamfering pressure plate 342 is installed on the first chamfering upper mounting plate 341 through the first guide pillar 3421 and the first return spring 3422. During stamping, the pressure plate first contacts the pole piece and presses it tightly; during the return stroke, the return spring drives the pressure plate to quickly return to its original position, avoiding pole piece adhesion.

[0070] AsFigure 13 As shown, a stock supporting plate 500 is arranged at the rear side of the first chamfering female die 344. The stock supporting plate 500 is used for docking with the lower cutting knife 270 of the cutting die 200. The height of the stock supporting plate 500 is flush with the supporting platform 280 of the lower cutting knife 270 of the cutting die 200, forming a seamless transition from cutting to chamfering of the pole piece, and preventing the pole piece from sagging and deforming.

[0071] As Figure 12 and Figure 13 As shown, in an embodiment, the cutting die 200 includes a cutting upper template 210, a third guiding component 220, a cutting middle plate 230, a cutting bottom plate 240, an upper cutting knife 250, an upper pressure plate 260, a lower cutting knife 270 and a supporting platform 280. The cutting upper template 210 is installed on the cutting middle plate 230 through the third guiding component 220. The cutting middle plate 230 is installed on the cutting bottom plate 240. The upper cutting knife 250 and the upper pressure plate 260 are installed at the bottom of the cutting upper template 210. The lower cutting knife 270 and the supporting platform 280 are installed on the cutting middle plate 230.

[0072] The third guiding component 220 is a needle roller guide pillar and guide sleeve component.

[0073] As Figure 14 As shown, in an embodiment, a plurality of third air blowing holes 251 arranged along the length direction of the upper cutting knife 250 are spaced at the bottom of the upper cutting knife 250. The third air blowing holes 251 are used for blowing dust downward. An external air source continuously blows air into the cutting area through an air duct, and blows the dust generated by cutting downward to the dust removing part 272 of the lower cutting knife 270.

[0074] As Figure 15 As shown, in an embodiment, the lower cutting knife 270 includes a cutting part 271 and a dust removing part 272. The cutting part 271 is located at the front side of the upper surface of the dust removing part 272. The dust removing part 272 is provided with a plurality of first dust removing holes 2721 arranged vertically downward. The integrated layout of the cutting part 271 and the dust removing part 272 enables the dust generated by cutting to be captured by the first dust removing holes 2721 of the dust removing part 272 at the moment when the pole piece is separated. The vertically downward first dust removing holes 2721 are directly aligned with the cutting area, and through the guidance of negative pressure adsorption, the dust is quickly introduced downward along the vertical direction, avoiding the accumulation of dust on the die surface or scattering to the surface of the pole piece, and ensuring the cleanliness of the cutting surface.

[0075] As Figure 17 As shown, the cutting middle plate 230 is provided with a first dust removing channel 231 corresponding to the first dust removing holes 2721. The upper end of the first dust removing channel 231 is provided with a first inclined surface 232. The cutting bottom plate 240 is provided with a second dust removing channel 241 corresponding to the first dust removing channel 231.

[0076] A first flared opening 2722 is arranged at the upper end of the first dust removing hole 2721.

[0077] As Figure 16 and Figure 17 shown, in one embodiment, the support platform 280 includes a support main board 281, a support sub-board 282, and a floating support assembly 283. The support sub-board 282 is disposed on the support main board 281. The support main board 281 is mounted on the cutting middle board 230 through the floating support assembly 283. The support main board 281 includes a first dust removal groove 2811, a second dust removal hole 2812, and a first dust removal main channel 2813. The second dust removal hole 2812 is horizontally disposed and communicates with the first dust removal groove 2811. The second dust removal hole 2812 corresponds to the dust removal part 272. The first dust removal main channel 2813 communicates with the first dust removal groove 2811. The horizontally disposed second dust removal hole 2812 directly aligns with the dust removal part 272 of the lower cutting knife 270, guiding the cutting dust into the first dust removal groove 2811, and then centrally extracting it through the first dust removal main channel 2813, improving the dust removal efficiency by 60%.

[0078] As Figure 16 and Figure 17 shown, in one embodiment, a second dust removal groove 2821 is provided in the support sub-board 282. The second dust removal groove 2821 is horizontally disposed in the support sub-board 282, and the dust removal port of the second dust removal groove 2821 is close to the lower cutting knife 270. The second dust removal groove 2821 communicates with the first dust removal groove 2811. The second dust removal groove 2821 in the support sub-board 282 is close to the side of the lower cutting knife 270, capturing the dust escaping from the cutting edge and communicating with the first dust removal groove 2811 to form a "dual-channel adsorption", ensuring dust removal without dead angles and reducing the residue amount by more than 90%.

[0079] As Figure 16 shown, air extraction and dust removal pipes 284 are respectively connected to both sides of the first dust removal main channel 2813. Connecting both sides of the first dust removal main channel 2813, a stable air flow is formed through an external negative pressure system, realizing the fully enclosed transportation of dust, avoiding secondary pollution, and meeting the cleanliness standard for lithium battery production.

[0080] The support main board 281 and the support sub-board 282 adopt a split structure, which can be separately disassembled, cleaned, or replaced without overall disassembly of the mold, shortening the maintenance time.

[0081] The combined design of the support sub-board 282 and the support main board 281 provides a continuous and stable support surface for the pole piece, preventing the pole piece from sagging or shifting after cutting and ensuring that the pole piece accurately enters the chamfering die 300 station.

[0082] The working principle of this application is as follows:

[0083] The pole piece is conveyed to the support platform 280 (composed of the support main board 281 and the support sub-board 282) of the cutting die 200, and the floating support assembly 283 adapts to the thickness difference of the pole piece to ensure that the pole piece is flat and fits well.

[0084] The upper die top plate 110 drives the cutting upper die plate 210 to press downwards. The upper pressure plate 260 first contacts the pole piece and presses it tightly. Subsequently, the cutting part 271 of the upper cutting knife 250 and the lower cutting knife 270 cooperate to complete the cutting of the pole piece.

[0085] The first air blowing hole 3432 at the bottom of the upper cutting knife 250 blows air downwards to blow the dust generated by cutting away from the cutting area. After cutting is completed, the dust is removed through the first dust removal holes 2721 of the dust removal part 272 of the lower cutting knife 270; the first dust removal groove 2811, the second dust removal hole 2812 and the first main dust removal channel 2813 of the support main board 281 form a negative pressure channel, which cooperates with the second dust removal groove 2821 of the support sub-board 282 to discharge the dust centrally, avoiding the accumulation of dust and affecting the cutting accuracy.

[0086] While the pole piece is being cut, the chamfering die 300 station is carried out.

[0087] When the upper die top plate 110 presses downwards, the upper die change plate 310 of the chamfering die 300 drives the first chamfering component 340 and the second chamfering component 350 to move downwards, and cooperates with the corresponding concave die on the lower die change plate 320 to chamfer the edge of the first pole piece; the third chamfering component 360 and the second chamfering component 350 act in coordination to complete the chamfering of the second pole piece, realizing "one out of two" synchronous chamfering.

[0088] The first air blowing hole 3432 is arranged in the first inclined avoidance groove 3431 of the first chamfering punch 343, and blows air when the upper die change plate 310 returns after chamfering to remove the waste in the gap between the concave die and the punch. The first blanking groove 3441 of the first chamfering concave die 344 is used to guide the waste to slide down, and the second air blowing hole 3443 on the inner wall further blows the residual waste to ensure the cleanliness of the concave die;

[0089] When pole pieces of different specifications need to be processed, only the upper die change plate 310 and the lower die change plate 320 need to be disassembled and replaced, and the relative positions and dimensions of the first, second, and third chamfering components 360 are adjusted, while the cutting die 200 remains fixed and there is no need to re-adjust the cutting parameters.

[0090] The embodiments described above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present application.

Claims

1. A pole piece cutting and chamfering die, comprising a die holder, a cutting die and a chamfering die. The cutting die and the chamfering die are both installed on the die holder. The die holder includes an upper die top plate, a first guiding component and a lower die bottom plate. The upper die top plate is installed on the lower die bottom plate through the first guiding component. The upper dies of the cutting die and the chamfering die are both installed at the bottom of the upper die top plate, and the lower dies of the cutting die and the chamfering die are both installed at the top of the lower die bottom plate. It is characterized in that: The chamfering die includes an upper die change plate, a lower die change plate, a second guiding component, a first chamfering component, a second chamfering component and a third chamfering component. The punches of the first chamfering component, the second chamfering component and the third chamfering component are all installed on the upper die change plate. The upper die change plate is installed at the bottom of the upper die top plate. The dies of the first chamfering component, the second chamfering component and the third chamfering component are all installed on the lower die change plate. The first chamfering component cooperates with the second chamfering component to chamfer the first pole piece, and the third chamfering component cooperates with the second chamfering component to chamfer the second pole piece.

2. The polar plate cutting chamfering die according to claim 1, characterized in that: The first chamfering component includes a first upper chamfering mounting plate, a first chamfering pressure plate, a first chamfering punch, a first chamfering die and a first lower chamfering mounting plate. The first chamfering pressure plate and the first chamfering punch are both installed on the first upper chamfering mounting plate. The first upper chamfering mounting plate is installed on the upper die change plate. The first chamfering die is installed on the first lower chamfering mounting plate. The first lower chamfering mounting plate is installed on the lower die change plate.

3. The polar plate cutting chamfering die according to claim 2, characterized in that: A first inclined avoiding groove is arranged on the bottom surface of the first chamfering punch, and a first air blowing hole is arranged on the first inclined surface of the first inclined avoiding groove.

4. The polar plate cutting chamfering die according to claim 2, characterized in that: A first blanking groove is arranged on the first chamfering die, and a first avoiding groove is arranged on the side edge of the first blanking groove along the pole piece discharging direction.

5. The polar plate cutting and chamfering die according to claim 4, characterized in that: A second air blowing hole is arranged on the inner wall of the first blanking groove.

6. A pole piece cutting and chamfering die according to any one of claims 1 to 5, characterized in that: The cutting die includes a cutting upper template, a third guiding component, a cutting middle plate, a cutting bottom plate, an upper cutting knife, an upper pressure plate, a lower cutting knife and a supporting platform. The cutting upper template is installed on the cutting middle plate through the third guiding component. The cutting middle plate is installed on the cutting bottom plate. The upper cutting knife and the upper pressure plate are installed at the bottom of the cutting upper template. The lower cutting knife and the supporting platform are installed on the cutting middle plate.

7. The pole piece cutting chamfering die according to claim 6, characterized in that: A plurality of third air blowing holes are arranged at intervals at the bottom of the upper cutting knife along the length direction of the upper cutting knife, and the third air blowing holes are used for blowing dust downward.

8. The pole piece cutting chamfering die according to claim 6, characterized in that: The lower cutting knife includes a cutting part and a dust removing part. The cutting part is located at the front side of the upper surface of the dust removing part. The dust removing part is provided with a plurality of first dust removing holes arranged vertically downward.

9. The polar plate cutting chamfering die according to claim 8, characterized in that: The supporting platform includes a supporting main board, a supporting sub-board and a floating supporting component. The supporting sub-board is arranged on the supporting main board. The supporting main board is installed on the cutting middle plate through the floating supporting component. The supporting main board includes a first dust removing groove, a second dust removing hole and a first main dust removing channel. The second dust removing hole is arranged horizontally and communicated with the first dust removing groove. The second dust removing hole corresponds to the dust removing part. The first main dust removing channel is communicated with the first dust removing groove.

10. A pole piece cutting chamfering die according to claim 9, characterized in that: A second dust removing groove is arranged in the supporting sub-board. The second dust removing groove is arranged horizontally in the supporting sub-board, and the dust removing port of the second dust removing groove is close to the lower cutting knife. The second dust removing groove is communicated with the first dust removing groove.

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