Pore-forming equipment and assembly line

Abstract

The utility model relates to pore-forming equipment and an assembly line, the pore-forming equipment comprises a pore-forming roller body internally provided with a fluid channel, the peripheral surface of the pore-forming roller body is a roller surface, a plurality of pore-forming parts used for forming pores in a pole piece are convexly arranged on the roller surface, and the pore-forming equipment further comprises a heating piece used for heating fluid in the fluid channel so as to heat the pore-forming parts. When the heated pore-forming part is used for performing pore-forming on the pole piece, the pore-forming part can release residual stress on the pore structure unit formed on the pole piece more quickly, the deformation of the pole piece and the bulge of the surface active material of the pole piece are reduced, and the thickness of the pole piece after pore-forming is reduced, so that the space utilization rate of the power battery with the pore structure unit is improved, and the energy consumption of the power battery is reduced. According to the present invention, the energy density of the power battery is improved, the stability of the pore structure unit during the charge-discharge cycle and the electric quantity storage process is improved, the charge-discharge cycle number and the storage life of the power battery with the pore structure unit are improved, and the power battery has characteristics of high energy density and rapid charge performance.

Description

Technical Field

[0001] This application relates to the field of power battery production technology, and in particular to a hole-forming device and production line. Background Technology

[0002] Innovation and advancements in lithium battery technology have greatly promoted the development of the new energy vehicle industry. After years of development, continuous innovation in rechargeable battery technology, materials, and structures has enabled rechargeable batteries to break through the original technological limits of power batteries, powerfully driving the popularization of new energy vehicles and bringing new variables to the reshaping of the automotive industry landscape. In the power battery industry, the rate (C) represents the charging rate, that is, the multiple of the charging current relative to the rated capacity of the cell. The larger the number before C, the faster the charging speed. For example, 4C means that the battery can be fully charged in a quarter of an hour (15 minutes). However, currently, for new energy vehicles that can achieve a 4C charging rate, it is mostly achieved by sacrificing volumetric energy density (or gravimetric energy density) and raw material costs. By creating holes in the battery electrodes, power batteries can achieve both high energy density and fast charging performance.

[0003] Existing methods for mechanically creating holes on electrode surfaces mostly involve machining densely packed holes into the electrode surface after the electrode rolling process, thus creating a perforated electrode. Illustratively, current technologies typically utilize a metal needle array mold to mechanically create holes at fixed points and speeds on the electrode surface. However, because the needle array mold applies anisotropic stress during the hole-creating process, it causes electrode deformation and protrusion of the surface active material, increasing the thickness of the electrode after hole creation (i.e., increasing the electrode's rebound rate), reducing the battery's space utilization, and preventing this electrode design from fully maximizing the battery's energy density. Utility Model Content

[0004] Therefore, it is necessary to provide a pore-forming device and production line that does not easily cause the surface active material of the electrode to bulge during the pore-forming process.

[0005] A hole-forming device includes a hole-forming roller body with a fluid channel inside, the outer peripheral surface of the hole-forming roller body is a roller surface, and a plurality of hole-forming portions for forming holes in electrode sheets are protruding on the roller surface. The hole-forming device also includes a heating element for heating the fluid in the fluid channel to heat the hole-forming portions.

[0006] In one embodiment, the fluid channel includes an inflow channel and an outflow channel that both extend along the length of the pore-forming roller body, the inflow channel and the outflow channel are connected, and the inflow channel is located between the pore-forming part and the outflow channel.

[0007] In one embodiment, the same end of the pore-forming roller is provided with an inlet and an outlet, the inlet being connected to the inflow channel and the outlet being connected to the outflow channel.

[0008] In one embodiment, the perforating roller body includes a roller body and a first end cap disposed at the end of the roller body. The outer peripheral surface of the roller body is the roller surface. The inflow channel and the outflow channel are both disposed inside the roller body. The first end cap is provided with a first channel and a second channel that both extend along the length direction of the roller body, and the first channel is sleeved outside the second channel.

[0009] The opening of the first channel away from the roller body is the inlet, and the inlet is connected to the inflow channel through the first channel.

[0010] The opening of the second channel away from the roller body is the outlet, and the outlet is connected to the outflow channel through the second channel.

[0011] In one embodiment, both the inflow channel and the outflow channel penetrate the roller body. The roller body has a first end and a second end that are distributed opposite to each other. The first end cap is disposed at the first end. The perforating roller body also includes a second end cap disposed at the second end of the roller body. A communication channel is formed between the inner sidewall of the second end cap and the second end wall of the roller body. The inflow channel and the outflow channel are connected through the communication channel.

[0012] In one embodiment, the shape of the perforation portion is at least one of a cone, a frustum, a cylinder, a round-headed cylinder, and a spherical crown.

[0013] In one embodiment, the hole-making part is cone-shaped, the diameter of the hole-making part is L1, the height of the hole-making part is L2, wherein 2μm≤L1≤600μm, 1μm≤L2≤200μm, and 0.2≤L1 / L2≤3;

[0014] And / or, the distance between the tops of adjacent perforation portions is L3, 50μm≤L3≤10000μm.

[0015] In one embodiment, 30μm≤L1≤450μm, 10μm≤L2≤150μm, and 0.2≤L1 / L2≤1;

[0016] And / or, 100μm≤L3≤2000μm.

[0017] In one embodiment, the pore-forming device further includes a pressure member for providing pressure to the pore-forming roller body toward the electrode, the pressure member being connected to the pore-forming roller body.

[0018] This application also provides a production line including the hole-making device as described in any of the preceding embodiments.

[0019] Compared with existing technologies, the pore-forming equipment provided in this application, by setting a fluid channel inside the pore-forming roller and heating the fluid flowing into the fluid channel through a heating element, allows the fluid to be heated and exchange heat with the pore-forming portion protruding from the roller surface, enabling the heating element to indirectly heat the pore-forming portion and allow it to reach a preset temperature. When using the pore-forming portion at the preset temperature to form pores on the electrode, the residual stress on the pore structure unit formed on the electrode can be released more quickly, reducing the deformation of the electrode and the protrusion of the surface active material, thus reducing the rebound rate of the electrode surface and the thickness of the electrode after pore formation. This not only improves the space utilization and energy density of the power battery with the pore structure unit, but also enhances the stability of the pore structure unit, improving its stability during charge-discharge cycles and energy storage, increasing the number of charge-discharge cycles and storage life of the power battery with the pore structure unit, thereby enabling the power battery to achieve both high energy density and fast charging performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a perforating roller body according to an embodiment of this application;

[0022] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 This is an exploded view of a perforating roller body according to an embodiment of this application;

[0024] Figure 4 This is a cross-sectional view of the perforating roller body in the radial direction according to an embodiment of this application;

[0025] Figure 5 This is a cross-sectional view along the length of a perforating roller body according to an embodiment of this application;

[0026] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0027] Figure 7 for Figure 5 A magnified view of a section at point B in the middle.

[0028] Reference numerals: 10, perforation roller body; 100, roller body; 110, roller surface; 120, perforation section;

[0029] 101. Fluid channel; 1011. Inflow channel; 1012. Outflow channel; 1013. Inlet; 1014. Outlet; 1015. Connecting channel;

[0030] 200. First end cap; 201. First channel; 202. Second channel;

[0031] 300. Second end cap. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0037] Please see Figures 1 to 7 This application provides a hole-forming device, which includes a hole-forming roller body 10 with a fluid channel 101 inside. The outer peripheral surface of the hole-forming roller body 10 is a roller surface 110. A plurality of hole-forming portions 120 for forming holes in electrode sheets are protruding on the roller surface 110. The hole-forming device also includes a heating element for heating the fluid in the fluid channel 101 to heat the hole-forming portions 120.

[0038] It is understood that the pore-forming device in this embodiment is used to create pores on the surface of the battery electrode, and then use the electrode with the pore structure unit to manufacture a battery cell, such as a lithium-ion battery cell, a sodium-ion lithium-ion battery cell, etc., and this application does not limit this. The battery cell includes a positive electrode and a negative electrode with opposite polarities. The pore-forming device in this embodiment can create pores not only on the positive electrode but also on the negative electrode, and this application does not limit this.

[0039] Taking a lithium-ion battery cell as an example, this battery cell includes a positive electrode and a negative electrode with opposite polarities. The positive and negative electrode are separated and insulated by a porous separator. The positive electrode, separator, and negative electrode are fabricated into a battery cell by winding or stacking. The positive electrode includes an active material coating area, a tab, and a current collector. The current collector is a metal foil used to support and conduct current.

[0040] For lithium-ion battery cells constituting power batteries, the parameters of the battery electrodes, such as electrode porosity, internal pore size and distribution, active material compaction density, and electrode thickness, all have a significant impact on the battery's fast-charging performance. Reducing the coating weight of the electrode active material can decrease the polarization resistance of the electrode during charging and discharging, thereby improving the battery's fast-charging capability. However, increasing the coating weight of the active material on the electrode can reduce the mass (or volume) ratio of the foil, thereby increasing the energy density of the battery cell. However, increasing the electrode thickness to improve the energy density of the battery cell inevitably increases the impedance of the electrode during high-rate charging, leading to more severe deterioration of polarization resistance. Furthermore, this electrode is highly susceptible to lithium plating during high-rate charging, posing a significant safety hazard to battery cells using this electrode during long-term use. The pore-forming device in this embodiment creates pore structure units on the surface of the positive electrode in the active material coating area, with the orientation opposite to the foil. The porous structure on the surface of the positive electrode can significantly increase the porosity, specific surface area, electrolyte wettability and liquid retention of the thick electrode, thereby improving the dynamic performance of the high-coated heavy electrode and enabling the dynamic battery to achieve both high energy density and fast charging performance.

[0041] It is understood that the hole-making device provided in this embodiment provides a fluid channel 101 inside the hole-making roller body 10 and heats the fluid flowing into the fluid channel 101 through a heating element. Since the fluid can exchange heat with the hole-making part 120 protruding on the roller surface 110 of the hole-making roller body 10, the heating element can indirectly heat the hole-making part 120. When the electrode is pore-forming section 120 at a preset temperature, the pore-forming section 120 at the preset temperature can release the residual stress on the pore structure unit on the electrode more quickly, reduce the deformation of the electrode and the protrusion of the surface active material of the electrode, that is, reduce the rebound rate of the electrode surface and reduce the thickness of the electrode after pore formation. This not only improves the space utilization rate of the power battery with the pore structure unit and increases the energy density of the power battery, but also improves the stability of the pore structure unit, improves the stability of the pore structure unit in the charging and discharging cycle and the storage of energy, and increases the number of charging and discharging cycles and storage life of the power battery using the pore structure unit. In this way, the power battery can achieve both high energy density and fast charging performance.

[0042] Furthermore, the fluid flowing into the fluid channel 101 can be a liquid, a gas, or a gas-liquid two-phase fluid. This application does not impose any restrictions on this, as long as the fluid can be heated by the heating element. Furthermore, along the length of the pore-forming roller 10, the fluid channel 101 can extend through both ends of the pore-forming roller 10, or only through one end of the pore-forming roller 10, and can also circulate within the pore-forming roller 10. This application does not impose any restrictions on this, as long as the fluid heated by the heating element can heat the pore-forming portion 120. It should also be noted that both the pore-forming roller 10 and the pore-forming portion 120 in this embodiment use thermally conductive materials, and these thermally conductive materials will not change their properties due to heating, such as stainless steel or alloy materials with a surface coating. This application does not impose any restrictions on this.

[0043] Furthermore, the heating element can heat the fluid using methods such as electric heating, steam heating, or air heating. This application does not impose any restrictions on this, as long as the heating element is capable of heating the fluid. The heating element can be located inside or outside the pore-forming roller body 10, and can be directly connected to the pore-forming roller body 10 or indirectly connected via fluid. This application does not impose any restrictions on this, as long as the fluid heated by the heating element can flow into the pore-forming roller body 10 and thus heat the pore-forming section 120.

[0044] In one embodiment, such as Figure 5 As shown, the fluid channel 101 includes an inflow channel 1011 and an outflow channel 1012, both extending along the length of the perforating roller body 10. The inflow channel 1011 and the outflow channel 1012 are connected, and the inflow channel 1011 is located between the perforating section 120 and the outflow channel 1012. In this way, the fluid heated by the heated element can circulate inside the perforating roller body 10. The flow of the heated fluid inside the perforating roller body 10 makes the heat transfer between the fluid and the perforating section 120 more uniform, thereby making the heating of the heat-conducting part more uniform, and allowing the residual stress on the perforated hole structure unit on the electrode to be released more uniformly, thus better reducing the deformation of the electrode and reducing the rebound rate of the electrode surface.

[0045] Further, refer to Figure 4The number of outflow channels 1012 is one, and the central axis of the outflow channel 1012 is coaxial with the central axis of the pore-forming roller body 10. The number of inflow channels 1011 is multiple, all extending along the length of the pore-forming roller body 10. These multiple inflow channels 1011 are spaced apart circumferentially along the outflow channel 1012 inside the pore-forming roller body 10, thus enabling more uniform heating of the heat-conducting part. This application does not limit the number of inflow channels 1011, as long as the fluid in the inflow channels 1011 can heat the pore-forming part 120. Schematic, the number of inflow channels 1011 is eight. In other embodiments, the number of inflow channels 1011 is also one. In the circumferential direction of the pore-forming roller body 10, the inflow channel 1011 is an annular channel, and the inflow channel 1011 is sleeved outside the outflow channel 1012, thus further improving the uniformity of heating of the heat-conducting part.

[0046] In one embodiment, the same end of the pore-forming roller 10 is provided with an inlet 1013 and an outlet 1014. The inlet 1013 is connected to the inflow channel 1011, and the outlet 1014 is connected to the outflow channel 1012. Obviously, since the inflow channel 1011 and the outflow channel 1012 are connected, the outlet 1014 is located downstream of the inlet 1013 along the fluid flow path. It is understood that the pore-forming device also includes at least one of the following: a storage component for providing fluid, a recovery component for recovering fluid, a driving component for driving fluid from the inlet 1013 into the fluid channel 101, and a connecting component connecting the storage component, the fluid channel 101, and the recovery component. By arranging the fluid inlet 1013 and the outlet 1014 at the same end of the pore-forming roller 10, it is more advantageous to arrange at least one of the storage component, the recovery component, the driving component, and the connecting component. This helps to reduce the size of the pore-forming device and thus save production costs.

[0047] In one embodiment, reference Figure 2 , Figure 3 , Figure 5 and Figure 6The perforating roller body 10 includes a roller body 100 and a first end cap 200 disposed at the end of the roller body 100. The outer peripheral surface of the roller body 100 is a roller surface 110. The inflow channel 1011 and the outflow channel 1012 are both disposed inside the roller body 100. The first end cap 200 is provided with a first channel 201 and a second channel 202 that extend along the length direction of the roller body 100, and the first channel 201 is sleeved on the outside of the second channel 202. The opening of the first channel 201 away from the roller body 100 is an inlet 1013, which is connected to the inflow channel 1011 through the first channel 201. The opening of the second channel 202 away from the roller body 100 is an outlet 1014, which is connected to the outflow channel 1012 through the second channel 202. It should be noted that the hole-making device includes a connector for connecting the first end cap 200. By fitting the first channel 201 onto the outside of the second channel 202, when manufacturing the hole-making device, only the existing connector is used to connect the first end cap 200, which allows the connector to simultaneously connect the first channel 201 and the second channel 202. This improves the production efficiency of the hole-making device and reduces its size.

[0048] In one embodiment, reference Figure 3 and Figure 5 The inflow channel 1011 and the outflow channel 1012 both penetrate the roller body 100. The roller body 100 has a first end and a second end that are relatively distributed. A first end cap 200 is located at the first end. The perforating roller body 10 also includes a second end cap 300 located at the second end of the roller body 100. A connecting channel 1015 is formed between the inner sidewall of the second end cap 300 and the second end wall of the roller body 100. The inflow channel 1011 and the outflow channel 1012 are connected through the connecting channel 1015. Since both the inflow channel 1011 and the outflow channel 1012 penetrate the roller body 100, the manufacturing of the roller body 100 is simpler and more efficient.

[0049] In one embodiment, the end of the perforating portion 120 away from the roller surface 110 is defined as the top, and the end of the perforating portion 120 connected to the roller surface 110 is defined as the base. The cross-sectional area of ​​the top of the perforating portion 120 is smaller than the cross-sectional area of ​​the base. Therefore, the shape of the perforating portion 120 is at least one of a cone, a frustum, a cylinder, a round-headed cylinder, and a spherical cap. This reduces the resistance of the perforating portion 120 when creating holes on the electrode surface, which is beneficial for the insertion of the perforating portion 120 into the electrode, and further facilitates the creation of tiny hole structure units on the electrode by the perforating portion 120.

[0050] In one embodiment, reference Figure 7The hole-forming portion 120 is cone-shaped, which facilitates its insertion into the electrode sheet. In this embodiment, the diameter of the hole-forming portion 120 is L1, and the height of the hole-forming portion 120 is L2, wherein 2μm≤L1≤600μm, 1μm≤L2≤200μm, and 0.2≤L1 / L2≤3. It can be understood that if L1 / L2 is greater than 3, the hole-forming portion 120 will be too thin and too long, and will be prone to deformation during the hole-forming process. Keeping L1 / L2 between 0.2 and 3 not only achieves a relatively good hole-forming effect, but also ensures the stability of the hole-forming portion 120. Preferably, 30μm≤L1≤450μm, 10μm≤L2≤150μm, and 0.2≤L1 / L2≤1. This can further optimize the diameter / height ratio of the hole-making part 120, further avoid the hole-making part 120 from being too thin or too long, and help prevent the hole-making part 120 from being easily deformed during the hole-making process. For illustrative purposes, L1 can be 2μm, 10μm, 20μm, 40μm, 60μm, 80μm, 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, 200μm, 220μm, 240μm, 260μm, 280μm, 300μm, 320μm, 340μm, 360μm, 380μm, 400μm, 420μm, 440μm, 460μm, 480μm, 500μm, 520μm, 540μm, 560μm, 580μm, 600μm, or any other value within the range of 30μm≤L1≤450μm. For illustrative purposes, L2 can be 1μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, or any other value within the range of 10μm≤L2≤150μm. For illustrative purposes, L1 / L2 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, or any other value within the range of 0.2 ≤ L1 / L2 ≤ 3.

[0051] In one embodiment, the distance between the tips of adjacent pore-forming portions 120 is L3, where 50μm≤L3≤10000μm. If L3 is less than 50μm, the pore structure units on the electrode are too dense; if L3 is greater than 10000μm, the pore structure units on the electrode are too sparse. Both excessively dense and excessively sparse pore structure units will affect the pore-forming effect on the electrode, that is, affect the kinetic effect of the electrode, the wettability and electrolyte retention of the electrode, and the rebound rate of the electrode. For illustrative purposes, L3 can be 50 μm, 150 μm, 450 μm, 750 μm, 1050 μm, 2050 μm, 3050 μm, 4500 μm, 5000 μm, 6500 μm, 7050 μm, 8000 μm, 9200 μm, 10000 μm, or any other value in the range of 50 μm ≤ L3 ≤ 10000 μm.

[0052] Preferably, 100μm ≤ L3 ≤ 2000μm. This results in better pore formation of the electrode. Illustratively, L3 can also be 100μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 900μm, 1000μm, 1100μm, 1200μm, 1300μm, 1400μm, 1500μm, 1600μm, 1700μm, 1800μm, 1900μm, 1000μm, or any other value within the range of 100μm ≤ L3 ≤ 2000μm.

[0053] In one embodiment, the pore-forming apparatus further includes a pressure member for applying pressure to the electrode on the pore-forming roller 10, the pressure member being connected to the pore-forming roller 10. It is understood that different pressures can create pore structures of different depths, and the pore-forming apparatus can provide different pressure values ​​to the electrode to meet the pressure required for pore-forming the electrode.

[0054] Indicatively, both the first end cap 200 and the second end cap 300 are provided with connecting parts. The pressure member applies pressure to the connecting parts, thereby indirectly providing pressure to the roller body 100 towards the electrode sheet.

[0055] This application also includes a production line comprising the hole-forming device as described in any of the above embodiments.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A hole-forming device, characterized in that, The device includes a perforating roller body (10) with an internal fluid channel (101), the outer peripheral surface of the perforating roller body (10) is a roller surface (110), and the roller surface (110) is provided with a plurality of perforating portions (120) for perforating electrodes. The perforating device also includes a heating element for heating the fluid in the fluid channel (101) to heat the perforating portions (120).

2. The hole-forming device according to claim 1, characterized in that, The fluid channel (101) includes an inflow channel (1011) and an outflow channel (1012) that both extend along the length of the pore-forming roller body (10). The inflow channel (1011) and the outflow channel (1012) are connected. The inflow channel (1011) is located between the pore-forming part (120) and the outflow channel (1012).

3. The hole-forming device according to claim 2, characterized in that, The pore-forming roller body (10) has an inlet (1013) and an outlet (1014) at the same end. The inlet (1013) is connected to the inflow channel (1011), and the outlet (1014) is connected to the outflow channel (1012).

4. The hole-forming device according to claim 3, characterized in that, The perforating roller body (10) includes a roller body (100) and a first end cap (200) disposed at the end of the roller body (100). The outer peripheral surface of the roller body (100) is the roller surface (110). The inflow channel (1011) and the outflow channel (1012) are both disposed inside the roller body (100). The first end cap (200) is provided with a first channel (201) and a second channel (202) that extend along the length direction of the roller body (100), and the first channel (201) is sleeved on the outside of the second channel (202). The opening of the first channel (201) away from the roller body (100) is the inlet (1013), and the inlet (1013) is connected to the inflow channel (1011) through the first channel (201). The opening of the second channel (202) away from the roller body (100) is the outlet (1014), and the outlet (1014) is connected to the outflow channel (1012) through the second channel (202).

5. The hole-making device according to claim 4, characterized in that, The inflow channel (1011) and the outflow channel (1012) both penetrate the roller body (100). The roller body (100) has a first end and a second end that are distributed opposite to each other. The first end cap (200) is located at the first end. The hole-forming roller body (10) also includes a second end cap (300) located at the second end of the roller body (100). A connecting channel (1015) is formed between the inner sidewall of the second end cap (300) and the second end wall of the roller body (100). The inflow channel (1011) and the outflow channel (1012) are connected through the connecting channel (1015).

6. The hole-forming device according to any one of claims 1 to 5, characterized in that, The shape of the hole-making part (120) is at least one of a cone, a frustum, a cylinder, a round-headed cylinder, and a spherical crown.

7. The hole-forming device according to any one of claims 1 to 5, characterized in that, The hole-making part (120) is cone-shaped, the diameter of the hole-making part (120) is L1, the height of the hole-making part (120) is L2, wherein 2μm≤L1≤600μm, 1μm≤L2≤200μm, and 0.2≤L1 / L2≤3; And / or, the distance between the tops of adjacent perforation portions (120) is L3, 50μm≤L3≤10000μm.

8. The hole-making device according to claim 7, characterized in that, 30μm≤L1≤450μm, 10μm≤L2≤150μm, and 0.2≤L1 / L2≤1; And / or, 100μm≤L3≤2000μm.

9. The hole-making device according to any one of claims 1 to 5, characterized in that, The pore-forming device further includes a pressure member for providing pressure to the pore-forming roller (10) towards the electrode, the pressure member being connected to the pore-forming roller (10).

10. An assembly line, characterized in that, Includes the hole-forming device as described in any one of claims 1 to 9.

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