Special-shaped battery cell pole piece forming die

Abstract

The utility model belongs to the field of blanking die for electrode piece production, and disclose a special-shaped battery electrode piece forming die, it includes upper die holder, lower die holder, female die, male die and stripping structure, female die is located below upper die holder and is built -in two groups of cavity, male die is fixed in lower die holder and is corresponding with cavity one to one, stripping structure contains stripping plate and blow block, when working, female die down and male die cooperate blanking electrode piece coiled material, the slurry of easy adhesion side sets down to avoid cavity adhesion, after upper die reset, stripping plate moves upward under the action of elastic member, peels off electrode piece through mechanical force, simultaneously, blow block sprays gas through gas channel and assists stripping, side stop vane restricts airflow and protects electrode piece, the die sets up female die, cooperates stripping and side stop design through mechanical and blow, effectively solves the problem of special-shaped electrode piece adhesion, can blank two groups of electrode piece simultaneously, improves production efficiency and quality, and the practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of punching dies for electrode sheet production, specifically a die for forming irregularly shaped battery cell electrode sheets. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, batteries, as core energy storage components, have attracted much attention for their performance and safety. Electrode sheets, as the key carriers for energy conversion and storage in batteries, directly determine the battery's capacity, cycle life, and safety performance through their manufacturing quality. Electrode sheets typically consist of a metal foil current collector (aluminum or copper foil) and a layer of active material coated on the surface. Their morphological precision, edge quality, and surface integrity have a decisive impact on the battery's compatibility with stacking / winding processes, internal resistance stability, and short-circuit protection capabilities. With the increasing demands for energy density and space utilization in fields such as power batteries and energy storage batteries, irregularly shaped electrode sheets (such as those with irregular tabs, special contour notches, or asymmetrical structures) are widely used because they can adapt to compact cell designs. However, the forming and processing of irregularly shaped electrode sheets still faces many technical challenges, especially when using stamping processes, where the problems are more pronounced. Existing blanking processes form electrode sheets through the shearing action of a punch and die. However, irregularly shaped electrode sheets (such as complex curved edges, local protrusions, or depressions) have a large contact area with the punch during blanking and are subject to uneven stress. This makes them highly susceptible to adhesion to the punch surface due to electrostatic adsorption, surface tension, or the stickiness of active materials. Once adhesion occurs, subsequent electrode sheet rolls may enter the blanking area due to positioning deviations, causing secondary blanking errors. This not only leads to the scrapping of batches of products but may also cause equipment failures such as die jamming and punch wear due to material accumulation, resulting in production interruptions. The direct economic loss from a single failure often exceeds ten thousand yuan. Furthermore, adhered electrode sheets require manual cleaning, and with a thickness of only 8-20μm, wrinkles, tears, or coating peeling are easily caused during cleaning, further affecting product quality. At the same time, frequent downtime for maintenance increases equipment debugging costs and reduces production efficiency, especially for high-capacity production lines where efficiency losses are more significant. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a mold for forming irregularly shaped battery cell electrodes, thereby solving the problems mentioned in the background art, such as the easy adhesion of irregularly shaped electrode sheets, which affects production.

[0004] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a mold for forming irregularly shaped battery cell electrode sheets, comprising an upper mold base and a lower mold base, and further comprising: A die cavity, which is disposed below the upper die base, and has two sets of adjacent cavities inside. Two sets of punches are fixedly mounted on the lower die base, and the two sets of punches correspond one-to-one with the inner cavity of the die. The stripping structure includes a stripping plate and a stripping plate air blowing block. The stripping plate is disposed on the lower mold base, and the stripping plate air blowing block is fixedly disposed on the stripping plate.

[0005] Preferably, an upper clamping block is fixedly provided at the bottom of the upper mold base, and two sets of inner supports corresponding to the cavity are provided inside the upper clamping block. The cavity mold is fixedly provided on the side of the upper clamping block away from the upper mold base.

[0006] Preferably, the bottom of the stripper plate is provided with multiple sets of reset elastic elements, one end of the reset elastic element abuts against the stripper plate, and the other end of the reset elastic element is fixed in the lower mold base.

[0007] Preferably, the stripper plate blowing block has an air channel inside, the bottom of the stripper plate has an air inlet hole communicating with the air channel, and the side of the stripper plate blowing block near the punch has an air hole communicating with the air channel.

[0008] Preferably, two sets of parallel side baffles are provided between the die and the stripper plate, and the side baffles are perpendicular to the air blowing block of the stripper plate.

[0009] Preferably, the bottom of the upper clamping block is provided with a fixing groove corresponding to the side baffle blade, and the two sides of the stripping plate are provided with fixing blocks corresponding to the side baffle blade. The top end of the side baffle blade is fixed in the fixing groove, and the bottom end of the side baffle blade is fixed on the fixing block.

[0010] Preferably, a photoelectric counter mounting cover is provided on the side of the lower mold base adjacent to the stripper plate, and a counter mating hole corresponding to the photoelectric counter mounting cover is provided on the upper mold base and the upper clamping block.

[0011] Compared with the prior art, this utility model provides a mold for forming irregularly shaped battery cell electrode sheets, which has the following beneficial effects: This irregularly shaped electrode sheet forming mold is equipped with an upper mold base, a concave mold, a lower mold base, a convex mold, a stripper plate, a stripper plate air blowing block, and side baffle blades. It uses punching to process the electrode sheet roll into a fixed-shape electrode sheet. The air blowing block blows air onto the electrode sheet to prevent the finished electrode sheet from sticking to the convex mold, resulting in good production quality. It is suitable for the production of some irregularly shaped and easily sticky electrode sheets. It can punch two sets of electrode sheets at the same time, resulting in high production efficiency, good production quality, and strong practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a schematic diagram of the upper mold structure of this utility model; Figure 3 This is a schematic diagram of the lower mold structure of this utility model; Figure 4 This is a schematic diagram of the material removal plate air blowing block and the side baffle fan blade structure of this utility model; Figure 5 This is a schematic diagram of the stripping plate and the air blowing block of the stripping plate according to this utility model; Figure 6 This is a schematic diagram of the mounting cover structure for the photoelectric counter of this utility model.

[0013] In the diagram: 1. Upper mold base; 2. Cavity mold; 3. Lower mold base; 4. Punch mold; 5. Stripper plate; 6. Stripper plate air blowing block; 7. Side baffle blade; 8. Upper clamping block; 9. Inner support; 10. Reset elastic element; 11. Air passage; 12. Air inlet; 13. Air blowing hole; 14. Fixing groove; 15. Fixing pressure block; 16. Photoelectric counter mounting cover; 17. Counter mating hole. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-6 This utility model provides a technical solution: A mold for forming irregularly shaped battery cell electrode sheets includes an upper mold base 1 and a lower mold base 3, and further includes: Die 2 is located below the upper die base 1, and two sets of adjacent cavities are provided inside die 2; Two sets of punches 4 are fixedly mounted on the lower die base 3, and the two sets of punches 4 correspond one-to-one with the inner cavity of the die 2; The stripping structure includes a stripping plate 5 and a stripping plate air-blowing block 6. The stripping plate 5 is mounted on the lower die base 3, and the stripping plate air-blowing block 6 is fixedly mounted on the stripping plate 5. Guide pillars are provided at the four corners of 1 and 3. This utility model is different from common punching dies. The die 2 is on top and the punch 4 is on the bottom. During operation, the die 2 moves downward and contacts the punch 4. The electrode sheet roll is held by 4 and shears and breaks. The broken part has the same shape as the cavity, and the side of the roll containing slurry faces down (usually the side containing slurry is easy to stick. If both sides contain slurry, the side that is easy to stick will face down). The produced electrode sheet will not stick to the upper cavity.

[0016] Furthermore, an upper clamping block 8 is fixedly installed at the bottom of the upper mold base 1. Two sets of inner supports 9 corresponding to the cavity are installed inside the upper clamping block 8. The cavity mold 2 is fixedly installed on the side of the upper clamping block 8 away from the upper mold base 1. The inner supports 9 assist in the installation and fixation of the cavity mold 2, and inner supports 9 of different heights can be replaced to facilitate the adjustment of the cavity depth of the cavity mold 2, so as to produce products with the same shape but different materials and thicknesses.

[0017] Furthermore, the bottom of the stripper plate 5 is provided with multiple sets of reset elastic elements 10. One end of the reset elastic element 10 abuts against the stripper plate 5, and the other end of the reset elastic element 10 is fixed in the lower die base 3. The reset elastic element 10 provides elastic force. The stripper plate 5 is initially in the demolded state. When the punching operation is performed, the entire upper die is pressed down, and the punch 4 contacts the die 2 to punch the coil into an electrode sheet. At this time, the upper clamping block 8 abuts against the entire stripper plate 5, causing the stripper plate 5 to move downward to expose the punch 4. The punch 4 contacts the cavity in the die 2, and the electrode sheet is placed on the top of the punch 4. After the upper die is reset, the stripper plate 5 loses the squeezing force of the upper clamping block 8. The stripper plate 5 is driven upward by the reset elastic element 10 to reset. By the stripper plate 5 abutting against the edge of the electrode sheet, the electrode sheet is separated from the punch 4. It is recommended to set four sets of reset elastic elements 10 at the four corners of the stripper plate 5. It is recommended to use SGBBS10-20 model springs for the reset elastic elements 10, which have suitable elastic force and are easy to purchase and use.

[0018] Furthermore, the stripper plate air block 6 has an air channel 11 inside, and the bottom of the stripper plate 5 has an air inlet 12 that communicates with the air channel 11. The stripper plate air block 6 has an air blowing hole 13 on the side near the punch 4, and the air blowing hole 13 communicates with the air channel 11. The air inlet 12 is connected to an air source, usually an air compressor. For some high-end models or electrode sheets made of special materials, inert gas or cryogenic gas can be filled in a pre-made gas cylinder. The gas input control adopts existing technology, usually with intermittent output. When the stripper plate 5 is reset, air is output, which blows the electrode sheet to make it unload. This also avoids the slight adhesion of some electrode sheets to the stripper plate 5. It is suitable for demolding and unloading irregularly shaped electrode sheets or multiple sets of electrode sheets, with good demolding effect and less adhesion.

[0019] Furthermore, two sets of parallel side baffles 7 are provided between the die 2 and the stripper plate 5, and the side baffles 7 are perpendicular to the stripper plate air block 6. The side baffles 7 have two functions: first, to shield the external protective electrode sheet and minimize the contact of external contaminants with the electrode sheet; second, to assist in stripping by constraining the airflow direction, directing the airflow toward the produced electrode sheet, completing the unloading operation, and preventing the electrode sheet from being blown away and scattered.

[0020] Furthermore, the bottom of the upper clamping block 8 is provided with a fixing groove 14 corresponding to the side baffle blade 7, and the two sides of the stripping plate 5 are provided with fixing blocks 15 corresponding to the side baffle blade 7. The top of the side baffle blade 7 is fixed in the fixing groove 14, and the bottom of the side baffle blade 7 is fixed on the fixing block 15.

[0021] Furthermore, a photoelectric counter mounting cover 16 is provided on the side of the lower mold base 3 adjacent to the stripper plate 5, and counter mating holes 17 corresponding to the photoelectric counter mounting cover 16 are provided on the upper mold base 1 and the upper clamping block 8. A photoelectric counter is installed inside the photoelectric counter mounting cover 16. The specific model is not limited, and any commonly used by those skilled in the art is applicable. A stop bar is installed inside the counter mating hole 17. Each time the mold is operated, the stop bar extends down to block the light path to realize the counting function. The blocking signal can also be used to calibrate the air source output, avoiding the accumulation of errors over a long period of use and improving the stripping effect.

[0022] Structural Description: Upper mold base 1: The basic structure located on the upper part of the mold, with guide pillars at the four corners and upper clamping block 8 fixed at the bottom, used to support the upper components such as the die 2, and to achieve precise guiding and matching with the lower mold base 3; Die 2: Located below the upper die base 1, it has two sets of adjacent cavities, which correspond one-to-one with punch 4. During operation, it moves downward and cooperates with punch 4 to complete the punching of electrode sheet roll. The shape of the cavity determines the shape of the finished electrode sheet. Lower mold base 3: The basic structure located at the bottom of the mold, with guide pillars at the four corners corresponding to the upper mold base 1, used to fix the punch 4, install the stripper plate 5 and the reset elastic element 10, etc., and provide lower support for the overall mold; Punch 4: A protruding structure fixed on the lower die base 3. The two sets of punches 4 correspond one-to-one with the inner cavity of the die 2. During punching, they cooperate with the die 2 to apply shearing force to the electrode sheet roll, so that the roll is formed into an electrode sheet of the corresponding shape. Stripper plate 5: A plate-shaped structure on the lower die base 3, with multiple sets of reset elastic elements 10 connected to the bottom. In the initial state, it covers part of the punch 4. During punching, it is pressed down by the upper clamping block 8 to expose the punch 4. During reset, the electrode sheet is separated from the punch 4 by mechanical force. Stripper plate air blowing block 6: a block structure fixed on stripper plate 5, with an air channel 11 inside and an air blowing hole 13 on the side near the punch 4, which is connected to the air inlet hole 12 at the bottom of stripper plate 5, and is used to introduce gas to assist in stripping the electrode sheet. Side baffle blades 7: Two sets of parallel sheet-like structures are provided between the die 2 and the stripper plate 5. They are perpendicular to the stripper plate air blowing block 6. The top end is fixed in the fixing groove 14 of the upper clamping block 8, and the bottom end is fixed by the fixing pressure block 15 of the stripper plate 5. They are used to protect the electrode sheet and constrain the airflow direction. Upper clamping block 8: A block-shaped structure fixed to the bottom of the upper mold base 1. It has two sets of inner supports 9 corresponding to the cavity of the die 2. The die 2 is fixed on the side away from the upper mold base 1. The bottom has a fixing groove 14 corresponding to the side baffle 7, which is used to fix the die 2 and transmit the upper mold pressure. Inner support 9: A columnar structure located inside the upper clamping block 8. Two sets of inner supports 9 correspond one-to-one with the cavity of the die 2, assisting in the installation and fixation of the die 2. The cavity depth of the die 2 can be adjusted by replacing inner supports 9 of different heights. Reset elastic element 10: An elastic element located between the bottom of the stripper plate 5 and the lower mold base 3. It is recommended to have four sets, each located at one of the four corners of the stripper plate 5, to provide a reset elastic force for the stripper plate 5 and drive the stripper plate 5 to move upward. Air passage 11: A channel opened inside the air blowing block 6 of the stripping plate, one end of which is connected to the air inlet 12 at the bottom of the stripping plate 5, and the other end is connected to the air blowing hole 13, used to deliver gas to the air blowing hole 13. Air inlet 12: A hole-like structure opened at the bottom of the stripper plate 5, which is connected to the air passage 11 of the stripper plate air block 6 and is used to connect to an external air source (such as an air compressor) to provide gas input for air stripping. Air blowing hole 13: A hole-like structure opened on the side of the stripper plate air blowing block 6 near the punch 4, which is connected to the air channel 11 and is used to blow gas in a direction to the contact point between the electrode plate and the punch 4 to assist stripping. Fixing groove 14: A groove-shaped structure opened at the bottom of the upper clamping block 8, corresponding to the top of the side baffle blade 7, used to fix the top of the side baffle blade 7; Fixed pressure block 15: A block-shaped structure located on both sides of the stripper plate 5, corresponding to the bottom end of the side baffle blade 7, used to fix the bottom end of the side baffle blade 7, and cooperates with the fixing groove 14 to achieve stable installation of the side baffle blade 7. Photoelectric counter mounting cover 16: A cover-like structure located on the side of the lower die base 3 near the stripper plate 5, which is used to install a photoelectric counter and cooperates with the counter to realize the counting of punching times through the matching hole 17; Counter mating hole 17: A hole-like structure opened on the upper mold base 1 and the upper clamping block 8, corresponding to the photoelectric counter mounting cover 16. A stop bar is installed inside, and the counting is achieved by blocking the light path through the stop bar. It is also used to calibrate the air source output.

[0023] Working principle: When the mold is working, the electrode sheet roll is conveyed to the space between the die 2 and the punch 4 along a set path, with the side of the roll containing the slurry that is prone to sticking facing downwards. In the initial state, the stripper plate 5 on the lower mold base 3 is in the upper position under the support of the four corner reset elastic members 10, and the punch 4 is partially embedded in the corresponding through hole of the stripper plate 5, with only the top end exposed; the upper mold base 1 is precisely guided to the lower mold base 3 through the four corner guide posts, and the die 2 is in the position to be stamped along with the upper mold base 1, with its two sets of cavities aligned one-to-one with the two sets of punches 4 of the lower mold.

[0024] During the stamping stage, the upper die holder 1 drives the die 2 downwards. First, it contacts the stripper plate 5 at the bottom of the upper clamping block 8. As the upper die continues to descend, the stripper plate 5 overcomes the elastic force of the reset elastic element 10 and moves downwards, gradually exposing the complete punch 4. When the die 2 contacts the punch 4, the shearing action of both is used to punch the electrode sheet roll – the cavity of the die 2 and the punch 4 cooperate to separate the corresponding shaped parts of the roll, forming a non-circular electrode sheet consistent with the cavity contour. At this time, because the slurry side of the roll is prone to adhesion, the punched electrode sheet will adhere to the top of the punch 4, rather than the upper die cavity, reducing the risk of adhesion from the source. Simultaneously, the inner support 9 within the upper clamping block 8 compensates for the depth of the die 2 through its own height, ensuring that the cavity depth is suitable for electrode sheet materials of different thicknesses.

[0025] During the stripping stage, the upper die holder 1 drives the die 2 to reset upwards, and the pressure of the upper clamping block 8 on the stripping plate 5 is gradually released. Driven by the reset elastic element 10, the stripping plate 5 moves upwards, and its surface abuts against the edge of the electrode sheet. Through mechanical force, the electrode sheet is peeled off from the top of the punch 4. Simultaneously, the stripping plate air blowing block 6 starts working: the air source (air compressor or inert gas cylinder) supplies air to the air passage 11 through the air inlet 12 at the bottom of the stripping plate 5. The air is blown in a direction through the blowing hole 13 towards the contact point between the electrode sheet and the punch 4, using the airflow pressure to help break up any possible adhesion. At this time, the side baffle blades 7 between the die 2 and the stripping plate 5, on the one hand, prevent external contaminants from contacting the electrode sheet, and on the other hand, constrain the airflow direction, so that the air is concentrated on the electrode sheet unloading path, preventing the electrode sheet from being blown away and scattered.

[0026] The photoelectric counter inside the photoelectric counter mounting cover 16 of the lower die base 3 counts through the counter mating hole 17 of the upper die. During each stamping, the stop rod in the mating hole extends downward to block the light path, triggering a counting signal. At the same time, this signal can synchronously control the intermittent output of the air source, ensuring precise coordination between the air blowing action and the stripper plate reset. Through the synergy of mechanical stripping and air blowing stripping, the airflow constraint of the side baffle blades, and the precise control of photoelectric counting, the die can stably complete the synchronous punching and stripping of two sets of irregularly shaped electrode sheets, effectively solving the adhesion problem and ensuring the stability and efficiency of continuous production.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A die for forming irregularly shaped battery cell electrodes, comprising an upper die base (1) and a lower die base (3), characterized in that, Also includes: The die (2) is located below the upper mold base (1) and has two sets of adjacent cavities. Two sets of punches (4) are fixedly mounted on the lower die base (3), and the two sets of punches (4) correspond one-to-one with the inner cavity of the die (2); The stripping structure includes a stripping plate (5) and a stripping plate air blowing block (6). The stripping plate (5) is disposed on the lower mold base (3), and the stripping plate air blowing block (6) is fixedly disposed on the stripping plate (5).

2. The irregularly shaped battery cell electrode forming mold according to claim 1, characterized in that, The upper mold base (1) is fixedly provided with an upper clamping block (8) at the bottom. The upper clamping block (8) is provided with two sets of inner supports (9) corresponding to the cavity. The cavity mold (2) is fixedly provided on the side of the upper clamping block (8) away from the upper mold base (1).

3. The irregularly shaped battery cell electrode forming mold according to claim 2, characterized in that, The bottom of the stripper plate (5) is provided with multiple sets of reset elastic elements (10). One end of the reset elastic element (10) abuts against the stripper plate (5), and the other end of the reset elastic element (10) is fixed inside the lower mold base (3).

4. The irregularly shaped battery cell electrode forming mold according to claim 3, characterized in that, The stripper plate air block (6) has an air passage (11) inside. The bottom of the stripper plate (5) has an air inlet (12) that communicates with the air passage (11). The stripper plate air block (6) has an air hole (13) on the side near the punch (4), and the air hole (13) communicates with the air passage (11).

5. The irregularly shaped battery cell electrode forming mold according to claim 4, characterized in that, Two sets of parallel side baffles (7) are provided between the die (2) and the stripper plate (5), and the side baffles (7) are perpendicular to the stripper plate air block (6).

6. The irregularly shaped battery cell electrode forming mold according to claim 5, characterized in that, The bottom of the upper clamping block (8) is provided with a fixing groove (14) corresponding to the side baffle blade (7), and the two sides of the stripping plate (5) are provided with fixing blocks (15) corresponding to the side baffle blade (7). The top of the side baffle blade (7) is fixed in the fixing groove (14), and the bottom of the side baffle blade (7) is fixed on the fixing block (15).

7. The irregularly shaped battery cell electrode forming mold according to claim 4, characterized in that, A photoelectric counter mounting cover (16) is provided on the side of the lower mold base (3) near the stripper plate (5), and a counter mating hole (17) corresponding to the photoelectric counter mounting cover (16) is provided on the upper mold base (1) and the upper clamping block (8).

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