Pole piece die cutting equipment

Abstract

The utility model relates to the technical field of cutting equipment, and provides pole piece die cutting equipment. The pole piece feeding device comprises a driving mechanism and a pole piece feeding mechanism, the pole piece die cutting equipment further comprises a pole piece die cutting mechanism which is located on the downstream of the pole piece feeding mechanism and used for receiving the pole pieces to be subjected to die cutting and output by the pole piece feeding mechanism. The pole piece die cutting mechanism comprises a first roller shaft and a second roller shaft. The second roller shaft and the first roller shaft are arranged side by side, and the first roller shaft and the second roller shaft synchronously move under the driving action of the driving mechanism and continuously die-cut a complete pole piece; according to the equipment to be subjected to die cutting, complete pole pieces can be obtained through continuous die cutting, the pole pieces subjected to die cutting do not need to be taken out from the pole piece die cutting equipment after at least one single pole piece is subjected to die cutting, and efficiency is improved; and the first cutter and the second cutter are meshed to realize pole piece die cutting, so that the pole piece die cutting precision is high (compared with pole piece die cutting equipment which does not adopt a meshing mode to realize pole piece die cutting).

Description

Technical Field

[0001] The utility model belongs to the technical field of cutting equipment, and more specifically relates to a pole piece die-cutting equipment. Background Art

[0002] As one of the core processes of wound battery cells, the pole piece die-cutting process is a process in which the pole pieces after film rolling are cut into single pole pieces by a die-cutting machine.

[0003] Most of the existing equipment for processing laminated battery cell pole pieces adopts tool die-cutting, which is mainly divided into two methods: (1) die-cutting with a split mold that reciprocates up and down; (2) die-cutting with a one-piece mold that reciprocates up and down. The first die-cutting method is highly efficient, but the dimensional accuracy of the pole pieces die-cut is low; the second die-cutting method produces pole pieces with high dimensional accuracy, but low efficiency. Therefore, the existing pole piece die-cutting methods cannot take into account both the die-cutting efficiency and the dimensional accuracy of the pole pieces die-cut.

[0004] Based on this, it is urgent to invent a pole piece die-cutting device to solve the above-mentioned technical problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to improve the accuracy of the pole piece die-cutting equipment under the premise of ensuring the pole piece die-cutting efficiency. Aiming at the above problem, a pole piece die-cutting equipment is provided.

[0006] The technical solution of the utility model to solve the above technical problems is to provide a pole piece die-cutting device, including: a driving mechanism and a pole piece feeding mechanism; the pole piece die-cutting device also includes a pole piece die-cutting mechanism located downstream of the pole piece feeding mechanism and used to receive the pole piece to be die-cut output by the pole piece feeding mechanism, and the pole piece die-cutting mechanism includes:

[0007] The first roller;

[0008] A second roller is arranged side by side with the first roller, and the first roller and the second roller move synchronously under the driving action of the driving mechanism and continuously die-cut a complete pole piece;

[0009] Wherein, a first cutting knife group is mounted on the surface of one of the first roller and the second roller, and a second cutting knife group is mounted on the surface of the other, and one of the first cutting knives in the first cutting knife group is meshed with the corresponding second cutting knife in the second cutting knife group when the first roller and the second roller move synchronously.

[0010] Furthermore, a first cutting knife group is arranged on the surface of the first roller, and a second cutting knife group is arranged on the surface of the second roller; and each first cutting knife is engaged with the next second cutting knife when the adjacent first cutting knife is separated from the corresponding second cutting knife.

[0011] Furthermore, the first cutting knife group includes a plurality of first cutting knives arranged axially along the first roller shaft and protruding from the surface of the first roller shaft, and the second cutting knife group includes a plurality of second cutting knives arranged axially along the second roller shaft and having a receiving cavity.

[0012] Specifically, the second cutter includes a second cutter body, a pressure plate and an elastic member that can reciprocate; the pressure plate is connected to the second cutter body through the elastic member, and each of the first cutters overcomes the elastic force of the elastic member and pushes the pressure plate to abut against the corresponding second cutter body.

[0013] More specifically, the shape of the first cutter and the cross-sectional profile of the receiving cavity are adapted to the shape of the complete pole piece.

[0014] Preferably, each of the second cutting knives is provided with a plurality of adsorption holes communicated with the receiving cavity.

[0015] More preferably, each of the adsorption holes is a vacuum adsorption hole, and each of the adsorption holes is connected to an external vacuum pumping device.

[0016] In one embodiment, the number of the first cutters is 2 to 8, and the number of the second cutters matches the number of the first cutters;

[0017] Wherein, a plurality of the first cutting knives are spaced and evenly arranged along the radial direction of the first roller shaft.

[0018] Preferably, a gap is provided between the pressing plate and the peripheral side of the second cutter body, and a size of the gap is between 1 um and 10 um.

[0019] Preferably, when the first cutter is meshed with the second cutter, the first cutter and the second cutter are always in a surface contact state.

[0020] The beneficial effects of the utility model are as follows: the die-cutting device can continuously die-cut complete pole pieces, and there is no need to remove the die-cut pole piece from the pole piece die-cutting device after die-cutting at least a single pole piece, thereby improving efficiency; and the pole piece die-cutting is achieved by meshing the first cutter and the second cutter, and the pole piece die-cutting precision is high (compared with pole piece die-cutting devices that do not adopt meshing to achieve pole piece die-cutting). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a simplified diagram of the pole piece die-cutting equipment of the utility model;

[0022] Figure 2 This utility model Figure 1 Structural diagram of the die-cutting mechanism for the middle pole piece;

[0023] Figure 3 This utility model Figure 2 An enlarged view of the A point of the middle pole die-cutting mechanism;

[0024] Figure 4 This utility model Figure 1 Schematic diagram of the structure of the middle electrode discharge conveyor belt.

[0025] Reference numerals:

[0026] 1-pole die-cutting mechanism; 10-first roller; 100-first cutter group; 1000-first cutter;

[0027] 11-second roller; 110-second cutter assembly; 1100-second cutter; 1100a-second cutter body; 1100b-pressing plate; 1100c-elastic member;

[0028] 2-pole feeding mechanism; 3-pole discharging conveyor belt; 4-waste conveying mechanism; 5-pole to be die-cut; 6-pole after die-cutting. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] refer to Figure 1 The utility model provides a pole piece die-cutting device, which includes a driving mechanism (for example, a driving motor) and a pole piece feeding mechanism 2. The pole piece feeding mechanism 2 conveys the pole piece 5 to be die-cut to the pole piece die-cutting mechanism 1 (for details, refer to the following) for die-cutting.

[0031] Implementation Method 1

[0032] Combination Figure 2 to Figure 4 , the pole piece die-cutting mechanism 1 is located downstream of the pole piece feeding mechanism 2 and is used to receive the pole piece 5 to be die-cut output by the pole piece feeding mechanism 2. Among them, the pole piece die-cutting mechanism 1 includes a first roller 10 and a second roller 11, the second roller 11 is arranged side by side with the first roller 10, and there is a gap between the first roller 10 and the second roller 11 for the pole piece 5 to be die-cut to enter. Preferably, the first roller 10 and the second roller 11 are arranged side by side on a vertical plane. Specifically, the first roller 10 and the second roller 11 move synchronously under the driving action of the driving mechanism and continuously die-cut a complete pole piece, which can continuously die-cut a complete pole piece, and there is no need to take out the complete pole piece after the die-cutting is completed, thereby improving the efficiency of die-cutting the complete pole piece.

[0033] In order to die-cut a complete pole piece by cooperating with the first roller 10 and the second roller 11, the surface of one of the first roller 10 and the second roller 11 is equipped with a first cutting knife group 100, and the surface of the other is equipped with a second cutting knife group 110. When the first roller 10 and the second roller 11 move synchronously, one of the first cutting knives 1000 in the first cutting knife group 100 is meshed with the corresponding second cutting knife 1100 in the second cutting knife group 110, so as to achieve die-cutting of a complete pole piece by meshing one of the first cutting knives 1000 with the corresponding second cutting knife 1100 (the rest is output via the waste conveying mechanism 4), thereby improving the accuracy of die-cutting a complete pole piece. It can be understood that the surface of the first roller 10 can be equipped with the first cutting knife group 100 or the second cutting knife group 110, and of course, the surface of the second roller 11 can also be equipped with the first cutting knife group 100 or the second cutting knife group 110. In this specific embodiment, a first cutting knife group 100 is mounted on the surface of the first roller 10, and a second cutting knife group 110 is mounted on the surface of the second roller 11 (see below for details).

[0034] Implementation Method 2

[0035] The difference between this embodiment and embodiment 1 is that: in order to realize continuous die-cutting of complete pole pieces when the first roller 10 and the second roller 11 move synchronously, a first cutter group 100 including a plurality of first cutters 1000 is arranged on the surface of the first roller 10, and similarly, a second cutter group 110 including a plurality of second cutters 1100 is arranged on the surface of the second roller 11. Moreover, each first cutter 1000 is engaged with the next second cutter 1100 when the adjacent first cutter 1000 is separated from the corresponding second cutter 1100, that is, during the synchronous movement of the first roller 10 and the second roller 11, each first cutter 1000 is engaged with the corresponding second cutter 1100 and then disengaged, and the adjacent first cutter 1000 is engaged with the next second cutter 1100 and then disengaged, and this rule is repeated. The other parts of this embodiment are the same as those of embodiment 1, and will not be described in detail here.

[0036] Implementation 3

[0037] The difference between this embodiment and embodiment 2 is that: in order to ensure that the first cutter 1000 and the second cutter 1100 are meshed and die-cut to form a complete pole piece, the first cutter group 100 includes a plurality of first cutters 1000 arranged axially along the first roller 10 and protruding from the surface of the first roller 10, and the second cutter group 110 includes a plurality of second cutters 1100 arranged axially along the second roller 11 and having a receiving cavity, each first cutter 1000 is meshed with the corresponding second cutter 1100 so that each first cutter 1000 is embedded in the receiving cavity of the corresponding second cutter 1100 and a complete pole piece is die-cut in the receiving cavity. It should be noted that the first cutter group 100 protrudes relative to the first roller 10, and the height value H1 of the protruding part formed by the first cutter group 100 relative to the first roller 10 is greater than 1 times the thickness value of the pole piece 6 after die-cutting, and less than 10 times the thickness value of the pole piece 6 after die-cutting. And the other parts of this embodiment are the same as embodiment 2, which will not be repeated here.

[0038] Implementation 4

[0039] The difference between this embodiment and embodiment 3 is that: in order to further ensure that the first cutter 1000 and the second cutter 1100 are engaged to die-cut a complete pole piece (here, it means that the pole piece 6 after die-cutting is complete compared to the expected pole piece shape before die-cutting), the second cutter 1100 includes a second cutter body 1100a, a pressing plate 1100b and an elastic member 1100c for supporting the pressing plate 1100b, and the pressing plate 1100b is connected to the second cutter body 1100a through the elastic member 1100c. In the process of the first cutter 1000 being embedded in the receiving cavity of the second cutter 1100, the pressing plate 1100b is driven by the elastic member 1100c to abut against the bottom of the second cutter body 1100a; or, when the first cutter 1000 is separated from the receiving cavity of the second cutter 1100, the pressing plate 1100b is driven by the elastic member 1100c to release the abutment with the bottom of the second cutter body 1100a. To summarize, each first cutter 1000 overcomes the elastic force of the elastic member 1100c to push the pressure plate 1100b against the corresponding second cutter body 1100a and die-cut a complete pole piece to increase the pressure on the pole piece 5 to be die-cut (that is, the pressure exerted by the elastic member 1100c on the die-cut pole piece, that is, the force opposite to the pressure exerted by the first cutter 1000 on the pole piece 5 to be die-cut).

[0040] Specifically, in this specific embodiment, the second cutter body 1100a can be a groove provided on the second roller 11, and the elastic member 1100c can be a spring with a supporting function. Of course, in other specific embodiments, the second cutter body 1100a and the elastic member 1100c can also be other structures capable of realizing the aforementioned functions. The other parts of this embodiment are the same as those of Embodiment 3, and are not described in detail here.

[0041] Implementation method 5

[0042] The difference between this embodiment and embodiment 3 is that: in order to achieve the first cutter 1000 and the second cutter 1100 meshing and die-cutting a complete pole piece (here, the pole piece used for winding or lamination is a complete pole piece, compared with some existing pole piece die-cutting equipment that processes a partial pole piece), the shape of the first cutter 1000 and the cross-sectional profile of the receiving cavity are adapted to the shape of the complete pole piece. Here, no restriction is imposed on the shape of the complete pole piece. And the other parts of this embodiment are the same as those of embodiment 3, and are not described here.

[0043] Implementation 6

[0044] The difference between this embodiment and embodiment 3 is that: in order to prevent the first cutter 1000 from being disengaged from the second cutter 1100 and the die-cut pole piece 6 placed in the receiving cavity of the second cutter 1100 and rotating with the second roller 11, resulting in the pole piece 6 being arranged in a mess on the pole piece discharge conveyor belt 3 (it should be noted that the pole piece discharge conveyor belt 3 is located downstream of the pole piece die-cutting mechanism 1 and below the second roller 11), that is, it still needs to be sorted manually or by machine, each second cutter 1100 is provided with an adsorption hole connected to the aforementioned receiving cavity, which is used to adsorb the complete pole piece that has been die-cut during the rotation of the second roller 11. Specifically, the adsorption hole is placed on the aforementioned pressing plate 1100b. Of course, in other specific embodiments, other structures can also be provided to ensure that the die-cut pole pieces 6 that fall onto the pole piece discharge conveyor belt 3 are arranged neatly without the need for subsequent sorting. And the other parts of this embodiment are the same as embodiment 3, which will not be repeated here.

[0045] Implementation 7

[0046] The difference between this embodiment and embodiment 6 is that, in order to ensure that the die-cut pole piece 6 is stably adsorbed on the second cutter 1100 during the rotation of the second roller 11, each adsorption hole is a vacuum adsorption hole, and each adsorption hole is connected to an external vacuum pumping device. The other parts of this embodiment are the same as those of embodiment 6, and will not be described in detail here.

[0047] Implementation 8

[0048] The difference between this embodiment and embodiment 3 is that in order to improve the efficiency of die-cutting pole pieces, that is, the roller (including the first roller 10 and the second roller 11) can die-cut as many pole pieces as possible for each rotation of the rollers, the number of first cutters 1000 can be 2 to 8, and the number of second cutters 1100 is adapted to the number of first cutters 1000. Here, no specific restriction is imposed on the number of first cutters 1000 and second cutters 1100. Among them, a plurality of first cutters 1000 are spaced and evenly arranged along the radial direction of the first roller 10. In contrast, a plurality of second cutters 1100 are also spaced and evenly arranged along the radial direction of the second roller 11. And the other parts of this embodiment are the same as those in embodiment 3, which will not be described here.

[0049] Implementation method 9

[0050] The difference between this embodiment and embodiment 4 is that, in order to further improve the accuracy of die-cutting a complete electrode piece, a gap is provided between the pressing plate 1100b and the circumference of the second cutter body 1100c, and the size of the gap is between 1um and 10um. The other parts of this embodiment are the same as those of embodiment 4 and will not be described in detail.

[0051] Embodiment 10

[0052] The difference between this embodiment and the above embodiment is that, in order to further ensure that a complete pole piece is die-cut, the first cutter and the second cutter are always in a surface contact state when they are meshed. The other parts of this embodiment are the same as the above embodiment and will not be described here.

[0053] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A pole piece die cutting device, comprising: The driving mechanism and the electrode feeding mechanism are characterized in that: it also includes a electrode die-cutting mechanism located downstream of the electrode feeding mechanism and used to receive the electrode to be die-cut output by the electrode feeding mechanism, and the electrode die-cutting mechanism includes: The first roller; A second roller is arranged side by side with the first roller, and the first roller and the second roller move synchronously under the driving action of the driving mechanism and continuously die-cut a complete pole piece; Wherein, a first cutting knife group is mounted on the surface of one of the first roller and the second roller, and a second cutting knife group is mounted on the surface of the other, and one of the first cutting knives in the first cutting knife group is meshed with the corresponding second cutting knife in the second cutting knife group when the first roller and the second roller move synchronously.

2. The pole piece die-cutting device according to claim 1, characterized in that: A first cutting knife group is arranged on the surface of the first roller, and a second cutting knife group is arranged on the surface of the second roller; and each first cutting knife is engaged with the next second cutting knife when the adjacent first cutting knife is separated from the corresponding second cutting knife.

3. The pole piece die-cutting device according to claim 2, characterized in that: The first cutting knife group includes a plurality of first cutting knives arranged along the axial direction of the first roller shaft and protruding from the surface of the first roller shaft, and the second cutting knife group includes a plurality of second cutting knives arranged along the axial direction of the second roller shaft and having a receiving cavity.

4. The pole piece die-cutting device according to claim 3, characterized in that: The second cutter comprises a second cutter body, a pressing plate and an elastic member for supporting the pressing plate; the pressing plate is connected to the second cutter body through the elastic member.

5. The pole piece die-cutting device according to claim 3, characterized in that: The shape of the first cutter and the cross-sectional profile of the receiving cavity are adapted to the shape of the complete pole piece.

6. The pole piece die cutting device according to claim 3, characterized in that: Each of the second cutting knives is provided with a plurality of adsorption holes communicated with the receiving cavity.

7. The pole piece die-cutting device according to claim 6, characterized in that: Each of the adsorption holes is a vacuum adsorption hole, and each of the adsorption holes is connected to an external vacuum pumping device.

8. The pole piece die-cutting device according to claim 3, characterized in that: The number of the first cutters is 2 to 8, and the number of the second cutters matches the number of the first cutters; Wherein, a plurality of the first cutting knives are spaced and evenly arranged along the radial direction of the first roller shaft.

9. The pole piece die cutting device according to claim 4, characterized in that: A gap is provided between the pressing plate and the peripheral side of the second cutter body, and a size of the gap is between 1um and 10um.

10. The pole piece die-cutting device according to any one of claims 1 to 9, characterized in that: When the first cutter is meshed with the second cutter, the first cutter and the second cutter are always in a surface contact state.

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