Pole piece die cutting equipment, pole piece die cutting method, positive pole piece and battery

Abstract

The invention provides pole piece die cutting equipment, a pole piece die cutting method, a positive pole piece and a battery. The pole piece die cutting equipment comprises a laser cutting piece, a bearing piece and a heat dissipation piece. The laser cutting piece is used for emitting laser; the bearing part is used for bearing pole pieces; the heat dissipation piece is arranged on the side, away from the laser cutting piece, of the bearing piece, corresponds to the to-be-cut area of the pole piece and is used for conducting heat exchange with the pole piece. According to the pole piece die cutting equipment, the heat dissipation piece is arranged in the pole piece die cutting equipment, the heat dissipation piece can exchange heat with the pole piece in the die cutting process, redundant heat in the cutting area is rapidly taken away, molten bead forming is fundamentally restrained, the size of the molten beads is reduced, even the molten beads are prevented from being generated, a smooth cutting edge without the molten beads is formed, and then the working performance of a battery cell is prevented from being affected.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to electrode die-cutting equipment, electrode die-cutting method, positive electrode and battery. Background Technology

[0002] In the era of large-scale energy storage, the energy storage industry has increasingly higher requirements for production capacity. In order to improve efficiency, the positive electrode die-cutting process has been changed from metal die-cutting to laser die-cutting. The industry currently generally uses infrared laser die-cutting. In the process of laser processing the electrode sheet into electrode tabs, the infrared laser directly cuts the electrode sheet. The high-temperature molten material is prone to splashing or re-solidifying on the edge of the cut, which can easily generate molten beads and affect the self-discharge of the cell. Summary of the Invention

[0003] In view of this, the first aspect of this application provides an electrode die-cutting apparatus, the electrode die-cutting apparatus comprising: Laser-cut parts, used to emit laser light; Support element, used to support the electrode sheet; A heat sink is disposed on the side of the support member away from the laser cutting member. The heat sink is disposed corresponding to the area to be cut of the electrode sheet and is used for heat exchange with the electrode sheet.

[0004] The heat dissipation component includes a housing with flow channels inside the housing for containing coolant.

[0005] The housing contains at least one partition, which is used to divide the flow channel into multiple interconnected sub-flow channels. And / or, at least one flow guide is provided in the flow channel.

[0006] The housing is selected from metal parts; And / or, the temperature of the coolant is 18°C ​​to 25°C; And / or, the resistivity of the coolant is ≤10. 6 Ω·cm; And / or, the flow rate of the coolant is 0.8 m / s to 1.2 m / s.

[0007] The heat sink further includes a protective layer, at least a portion of which is located on the side of the housing facing the laser-cut component.

[0008] The protective layer is selected from at least one of a ceramic layer, a boron nitride layer, a yttrium oxide layer, and an aluminum oxide layer.

[0009] The heat sink and the electrode are spaced apart, and the gap between the heat sink and the electrode is 0.5mm~1mm; The distance between the heat sink and the area to be cut of the electrode is ≤0.5mm; The wavelength of the laser is 1000nm~1200nm.

[0010] The electrode die-cutting equipment further includes an auxiliary component, which is located on the same side of the support component as the laser cutting component. The auxiliary component is used to introduce auxiliary gas, which is used to remove impurities generated during the cutting of the electrode.

[0011] The auxiliary gas is selected from at least one of nitrogen, helium, neon, argon, krypton, and xenon. And / or, the flow rate of the auxiliary gas is 10 L / min to 15 L / min; And / or, the angle between the nozzle through which the auxiliary gas is introduced and the laser beam path is 20° to 40°.

[0012] The electrode die-cutting equipment also includes a fixing component, which is located on one side of the carrier. The fixing component is used to create a negative pressure environment so that the electrode is fixed to the carrier and also adsorbs impurities generated during the cutting of the electrode.

[0013] A second aspect of this application provides a method for die-cutting an electrode sheet, the method comprising: Provide electrode die-cutting equipment and electrode sheets as provided in the first aspect of this application; The electrode is positioned on the support member, and the area to be cut of the electrode corresponds to the heat dissipation member. The laser cutting component is controlled to perform laser cutting on the electrode sheet, and the heat sink is controlled to exchange heat with the electrode sheet so that the electrode sheet forms an electrode tab.

[0014] In the step of cutting the electrode sheet with the laser cutting component, the laser satisfies at least one of the following conditions: The wavelength of the laser is 1000nm~1200nm; The output power of the laser is 300W~500W; The pulse frequency of the laser is 50kHz~100kHz; The pulse width of the laser is 10ns~20ns; The laser cutting speed is 100mm / s to 500mm / s; The distance between the focal point of the laser and the preset cutting position of the electrode is ≤0.02mm.

[0015] The steps of controlling the laser cutting component to perform laser cutting on the electrode and controlling the heat sink to exchange heat with the electrode include: Control the heat exchange between the heat sink and the electrode; The laser cutting component is controlled to perform laser cutting on the electrode sheet to form an electrode tab; Control the heat sink to stop working.

[0016] Specifically, the pre-preparation time for heat exchange between the heat sink and the electrode plate before the laser cutting component is started is ≥3s; After the laser cutting component is turned off, the heat sink and the electrode exchange heat for a first continuous working time of ≥5s, and then the heat sink is controlled to stop working.

[0017] The electrode die-cutting equipment also includes an auxiliary component, which is located on the same side of the support component as the laser cutting component. The auxiliary component is used to introduce auxiliary gas, which is used to remove impurities generated during the cutting of the electrode. The step of cutting the electrode sheet using the laser cutting component further includes: The auxiliary component is controlled to introduce auxiliary gas to remove impurities generated during the cutting of the electrode; wherein the angle between the nozzle through which the auxiliary gas is introduced and the laser optical path is an acute angle.

[0018] The electrode die-cutting equipment also includes a fixing component, which is located on one side of the carrier. The fixing component is used to create a negative pressure environment so that the electrode is fixed to the carrier and also adsorbs impurities generated during the cutting of the electrode. The steps of controlling the laser cutting component to perform laser cutting on the electrode sheet and controlling the heat sink to exchange heat with the electrode sheet further include: The fixing member is controlled to form a negative pressure environment so that the electrode is fixed to the carrier and also adsorbs impurities generated during the cutting of the electrode.

[0019] Specifically, after the laser cutting component is turned off, the fixing component forms a negative pressure environment for a second continuous working time of ≥3s, and then the fixing component is controlled to stop working.

[0020] The step of controlling the electrode to correspond to the heat sink includes: The electrode is kept in a flat state. Identification marks for locating the electrode sheets; According to the identification mark, the area to be cut of the electrode is set to correspond to the heat sink.

[0021] The third aspect of this application provides a positive electrode sheet, which is prepared by the die-cutting method of the electrode sheet provided in the second aspect of this application.

[0022] The fourth aspect of this application provides a battery, the battery comprising a negative electrode, a separator, an electrolyte, and a positive electrode as provided in the third aspect of this application.

[0023] The electrode die-cutting equipment, electrode die-cutting method, positive electrode and battery provided in this application, by setting heat dissipation components in the electrode die-cutting equipment, can exchange heat with the electrode during die-cutting, quickly remove excess heat from the area to be cut, suppress the formation of molten beads from the source, reduce the size of molten beads, or even avoid the formation of molten beads, forming a smooth, molten bead-free cutting edge, thereby avoiding affecting the working performance of the battery cell.

[0024] Furthermore, the heat sink can be seamlessly integrated into laser die-cutting production lines with relevant technologies without requiring significant equipment modifications, demonstrating strong compatibility. Adding the heat sink does not affect die-cutting performance; cutting speed, precision, and edge quality remain at the original levels. Moreover, the reduced heat-affected zone further improves the smoothness of the cut edges. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0026] Figure 1 This is a schematic diagram of the structure of an electrode die-cutting device provided in one embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the structure of a heat sink provided in one embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the structure of a heat sink provided in another embodiment of this application.

[0029] Figure 4 A schematic diagram of the structure of an electrode die-cutting device provided in another embodiment of this application.

[0030] Figure 5 This is a schematic diagram of the structure of the electrode sheet provided in one embodiment of this application before die-cutting.

[0031] Figure 6 This is a schematic diagram of the structure of the electrode sheet after die-cutting according to one embodiment of this application.

[0032] Figure 7 for Figure 6 A magnified view of a portion of the image.

[0033] Figure 8 This is a cross-sectional schematic diagram of an electrode sheet provided in one embodiment of this application.

[0034] Figure 9 A flowchart illustrating the electrode die-cutting method provided in one embodiment of this application. Figure 1 .

[0035] Figure 10 A flowchart illustrating the electrode die-cutting method provided in one embodiment of this application. Figure 2 .

[0036] Figure 11 A flowchart illustrating the electrode die-cutting method provided in one embodiment of this application. Figure 3 .

[0037] Figure 12 A flowchart illustrating the electrode die-cutting method provided in one embodiment of this application. Figure 4 .

[0038] Figure 13 A flowchart illustrating the electrode die-cutting method provided in one embodiment of this application. Figure 5 .

[0039] Labeling Explanation: Electrode Die-cutting Equipment 1, Laser Cutting Part 11, Heat Dissipation Part 12, Housing 121, Isolator 122, Flow Guide 123, Protective Layer 124, Liquid Inlet 125, Liquid Outlet 126, Supporting Part 13, Auxiliary Part 14, Fixing Part 15, Electrode 2, Metal Foil 21, Optical Foil Area 211, Overlap Area 212, Intermediate Area 213, Ceramic Edge Layer 22, Carbon Coating Layer 23, Positive Electrode Material Layer 24, Tab 25. Detailed Implementation

[0040] The following are preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

[0041] In view of this, in order to solve the above problems, please refer to the following: Figures 1-8 This embodiment provides an electrode die-cutting device 1, which includes a laser cutting component 11, a support component 13, and a heat sink 12. The laser cutting component 11 is used to emit laser light. The support component 13 is used to support the electrode 2. The heat sink 12 is disposed on the side of the support component 13 away from the laser cutting component 11. The heat sink 12 is disposed corresponding to the area to be cut of the electrode 2 and is used to exchange heat with the electrode 2.

[0042] The laser-cut part 11 is capable of emitting a laser. The laser is an infrared laser; further, the wavelength of the laser is between 1000nm and 1200nm, specifically examples include 1000nm, 1010nm, 1120nm, 1130nm, 1140nm, 1150nm, 1160nm, 1170nm, 1180nm, 1190nm, or 1200nm, etc. Preferably, the wavelength of the laser is 1064nm.

[0043] The carrier 13 is capable of supporting the electrode 2. The carrier 13 includes a conveyor and a smoothing component. The conveyor belt is used to move the electrode 2, and the smoothing component is used to keep the electrode 2 in a flat state.

[0044] For example, the electrode sheet 2 roll is placed at the upper roll of the electrode sheet die-cutting equipment 1, and the electrode sheet 2 is clamped and transported by the cooperation of the conveyor and the smoothing component so that the electrode sheet 2 is in a flat state.

[0045] Furthermore, in the electrode die-cutting equipment 1, the electrode 2 is properly connected to ensure that the electrode 2 is completely flat and fixed to prevent vibration or displacement.

[0046] The electrode 2 includes a metal foil 21 and a ceramic edge layer 22. The ceramic edge layer 22 is disposed on at least one side of the metal foil 21 and extends along the length direction of the metal foil 21.

[0047] The metal foil 21 comprises at least aluminum, and further comprises at least one of copper, nickel, titanium, and silver. Preferably, the metal foil 21 comprises aluminum. More preferably, the metal foil 21 is aluminum.

[0048] The thickness of the metal foil 21 is 10μm to 1μm, specifically for example, 10μm, 11μm, 12μm, 13μm, 14μm, or 15μm, etc.

[0049] The melting point of the metal foil 21 is 400℃~700℃, specifically, it can be 400℃, 450℃, 500℃, 550℃, 600℃, 650℃, or 700℃, etc.

[0050] The thickness of the ceramic edge layer 22 is 30μm to 50μm, specifically for example, 30μm, 35μm, 40μm, 45μm, or 50μm.

[0051] The ceramic edge layer 22 is made of inorganic fillers and binders.

[0052] Optionally, the inorganic filler includes any one or a combination of at least two of boehmite, barium titanate, aluminum oxide, titanium dioxide, magnesium oxide, or silicon carbide.

[0053] Optionally, the adhesive includes any one or a combination of at least two of polyimide, styrene-butadiene rubber, carboxymethyl cellulose, or polyarylene.

[0054] The metal foil 21 includes a light foil area 211 and an overlapping area 212. The ceramic edge layer 22 is disposed away from the light foil area 211 and is disposed in the overlapping area 212. The light foil area 211 is closer to the edge of the metal foil 21 than the overlapping area 212.

[0055] Specifically, the foil area 211 contains only metal foil 21, while the overlapping area 212 contains both metal foil 21 and ceramic edge layer 22.

[0056] Further optionally, the metal foil 21 further includes an intermediate region 213, which is farther from the edge of the metal foil 21 than the overlapping region 212. The intermediate region 213 is provided with a carbon coating layer 23, and a positive electrode material layer 24 is provided on the side of the carbon coating layer 23 facing away from the metal foil 21.

[0057] The thickness of the positive electrode material layer 24 is 50μm to 80μm, specifically for example, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, or 80μm, etc.

[0058] Specifically, the intermediate region 213 is provided with a metal foil 21, a carbon coating layer 23, and a positive electrode material layer 24.

[0059] Alternatively, overlapping areas 212 are provided on opposite sides of the intermediate area 213, and a foil area 211 is provided on the side of the overlapping area 212 away from the intermediate area 213. In other words, along the width direction of the metal foil 21, a foil area 211, an overlapping area 212, an intermediate area 213, another overlapping area 212, and another foil area 211 are arranged in sequence.

[0060] The electrode 2 is laser-cut to form an electrode tab 25.

[0061] For example, only the metal foil 21 is laser-cut.

[0062] For example, only the ceramic edge layer 22 is laser-cut.

[0063] For example, the metal foil 21 and the ceramic edge layer 22 are laser-cut.

[0064] After the electrode 2 is cut, the electrode 2 has an electrode tab 25, which is located in the foil area 211 and / or in the foil area 211 and the overlapping area 212.

[0065] The heat sink 12 is used for heat exchange with the electrode 2 to cool the electrode 2 during die cutting. The heat sink 12 and the laser-cut part 11 are located on opposite sides of the support member 13. For example, the laser-cut part 11 is located above the electrode 2, and the heat sink 12 is located below the electrode 2.

[0066] During the die-cutting process of electrode 2, heat sink 12 is set to the area to be cut of electrode 2, thereby quickly removing excess heat from the area to be cut, suppressing the formation of molten beads, reducing the size of molten beads, or even avoiding the formation of molten beads, and forming a smooth, molten bead-free cutting edge.

[0067] Specifically, the distance between the heat sink 12 and the area to be cut of the electrode 2 is ≤0.5mm. For example, it can be 0.5mm, 0.45mm, 0.4mm, 0.35mm, 0.3mm, 0.25mm, 0.2mm, 0.15mm, 0.1mm, 0.05mm, or 0, etc.

[0068] The heat sink 12 is spaced apart from the electrode 2, and the gap between the heat sink 12 and the electrode 2 is 0.5mm to 1mm. For example, it can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm.

[0069] The heat sink 12 and the electrode 2 are in a non-contact but close state. This arrangement not only allows for heat exchange with the electrode 2 during die cutting, quickly removing excess heat from the area to be cut and suppressing the formation of molten beads, but also prevents the electrode 2 from being contaminated, thereby avoiding affecting the working performance of the battery cell.

[0070] In summary, the electrode die-cutting equipment 1 provided in this embodiment provides a heat sink 12, which can exchange heat with the electrode 2 during die-cutting, quickly remove excess heat from the area to be cut, suppress the formation of molten beads from the source, reduce the size of molten beads, or even avoid the formation of molten beads, forming a smooth, molten bead-free cutting edge, thereby avoiding affecting the working performance of the battery cell.

[0071] Furthermore, the heat sink 12 can be seamlessly integrated into laser die-cutting production lines with relevant technologies without requiring significant equipment modifications, demonstrating strong compatibility. Adding the heat sink 12 does not affect die-cutting performance; cutting speed, precision, and edge quality remain at the original levels. Moreover, due to the reduction in the heat-affected zone, the smoothness of the cut edges is further improved.

[0072] Please refer to this as well. Figures 1-3 In one embodiment, the heat sink 12 includes a housing 121 having channels within it for containing coolant.

[0073] Specifically, the housing 121 has an inlet end 125 and an outlet end 126 that connect to the flow channel. Coolant can flow into the flow channel through the inlet end 125. The coolant in the flow channel exchanges heat with the electrode 2, thereby cooling and dissipating heat on the area to be cut of the electrode 2. The coolant in the flow channel can flow out through the outlet end 126.

[0074] Optionally, the electrode die-cutting equipment 1 further includes a drive pump, a temperature control module, and a storage tank. The drive pump is connected to the storage tank and is used to drive the flow of coolant. Both the inlet end 125 and the outlet end 126 are connected to the storage tank, which is used to store coolant. The temperature control module is used to regulate the temperature of the coolant. Further optionally, the temperature control module is located inside or outside the storage tank.

[0075] Optionally, after the coolant is injected into the heat sink 12 and circulates with the container, the coolant is vented to remove air bubbles. This embodiment can further improve the heat exchange efficiency of the coolant by removing air bubbles.

[0076] Furthermore, the housing 121 is provided with at least one isolation member 122, which is used to divide the flow channel into multiple interconnected sub-flow channels.

[0077] Optionally, the spacer 122 and the housing 121 can be integrally formed. Optionally, the spacer 122 can be elongated, wavy, or arc-shaped. Optionally, multiple sub-channels can form a serpentine channel or a U-shaped channel.

[0078] Therefore, by setting the isolation member 122, the flow channel is divided into multiple sub-flow channels, so that the coolant can fully contact the internal space of the housing 121, and avoid the side of the housing 121 near the electrode 2 from not being able to fully contact the coolant due to the gravity principle of the coolant, thereby improving the heat exchange effect of the heat dissipation member 12.

[0079] And / or, at least one flow guide 123 is provided in the flow channel.

[0080] Optionally, the flow guide 123 and the housing 121 can be integrally formed. Optionally, the flow guide 123 can be elongated, wavy, or arc-shaped, etc.

[0081] Optionally, multiple flow guides 123 are disposed within the flow channel. Further optionally, multiple flow guides 123 are disposed within multiple sub-flow channels. Optionally, multiple flow guides 123 are arranged in an array, and / or, multiple flow guides 123 are arranged in an alternating pattern.

[0082] Therefore, by providing the flow guide 123, this embodiment can change the flow parameters of the coolant, such as the flow direction and flow speed, so that the coolant forms a flow around it, thereby improving the fluidity of the coolant and enabling the coolant to carry away more heat, thereby further improving the heat exchange effect of the heat sink 12.

[0083] Furthermore, the housing 121 is selected from metal parts.

[0084] Specifically, the material of the housing 121 is selected from at least one of pure metals and alloys. For example, the material of the housing 121 is stainless steel.

[0085] The material of the housing 121 is selected from thermally conductive materials. Optionally, the thermal conductivity of the housing 121 is ≥12W / (m·K), specifically, examples include 12W / (m·K), or 15W / (m·K), or 20W / (m·K), or 25W / (m·K), or 30W / (m·K), or 40W / (m·K), or 50W / (m·K), or 60W / (m·K), etc.

[0086] Therefore, by defining the housing 121, this embodiment enables the heat sink 12 to have high thermal conductivity, thereby enabling the heat sink 12 to quickly remove excess heat from the area to be cut, suppressing the formation of molten beads from the source, reducing the size of molten beads, or even avoiding the formation of molten beads, forming a smooth, molten bead-free cutting edge, and thus avoiding affecting the working performance of the battery cell.

[0087] And / or, the temperature of the coolant is 18℃~25℃, specifically for example, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃, etc.

[0088] Therefore, by limiting the temperature of the coolant and precisely controlling the temperature range of the coolant within ±1℃, this embodiment can continuously remove excess heat from the area to be cut, suppress the formation of molten beads from the source, reduce the size of molten beads, or even avoid the formation of molten beads, forming a smooth, molten bead-free cutting edge, thereby avoiding affecting the working performance of the battery cell.

[0089] And / or, the resistivity of the coolant is ≤10. 6 Ω·cm, for example, 10 6 Ω·cm, or 0.5×10 6 Ω·cm, or 10 5 Ω·cm, or 0.5×10 5 Ω·cm, or 10 4 Ω·cm, or 0.5×10 4 Ω·cm, or 10 3 Ω·cm, or 0.5×10 3 Ω·cm, or 102 Ω·cm, or 0.5×10 2 Ω·cm, or 10Ω·cm, or 5Ω·cm, etc.

[0090] Therefore, this embodiment improves the reliability of the electrode die-cutting equipment 1 by limiting the resistivity of the coolant to avoid short circuits in the electrode 2.

[0091] And / or, the flow rate of the coolant is 0.8 m / s to 1.2 m / s, specifically for example, 0.8 m / s, or 0.85 m / s, or 0.9 m / s, or 0.95 m / s, or 1 m / s, or 1.05 m / s, or 1.1 m / s, or 1.15 m / s, or 1.2 m / s, etc.

[0092] Therefore, this embodiment limits the flow rate of the coolant to create turbulence, thereby improving the fluidity of the coolant and enabling it to carry away more heat, thus further improving the heat exchange effect of the heat sink 12.

[0093] The coolant consists of ethylene glycol and water, with ethylene glycol accounting for 40% to 60% of the coolant by mass and water accounting for 40% to 60% of the coolant by mass.

[0094] For example, the coolant is composed of ethylene glycol and deionized water, with ethylene glycol accounting for 50% of the mass of the coolant and water accounting for 50% of the mass of the coolant.

[0095] Furthermore, the heat sink 12 also includes a protective layer 124, at least a portion of which is disposed on the side of the housing 121 facing the laser-cut component 11.

[0096] The protective layer 124 covers at least the side of the housing 121 facing the laser-cut part 11. The protective layer 124 has thermal conductivity and laser resistance. Optionally, the protective layer 124 may be at least one layer.

[0097] For example, the protective layer 124 covers the side of the housing 121 facing the laser-cut part 11. Alternatively, the protective layer 124 may cover the entire outer surface of the housing 121.

[0098] Specifically, the protective layer 124 is selected from at least one of a ceramic layer, a boron nitride layer, a yttrium oxide layer, and an aluminum oxide layer.

[0099] The material of the protective layer 124 is selected from at least one of ceramics, boron nitride, yttrium oxide, and aluminum oxide.

[0100] Therefore, this embodiment provides a protective layer 124, which not only has protective properties to reduce the risk of laser damage to the heat sink 12 and thus extend the service life of the heat sink 12, but also has high thermal conductivity, thereby enabling the heat sink 12 to quickly remove excess heat from the area to be cut and suppress the formation of molten beads from the source.

[0101] Please refer to this as well. Figures 1-4 In one embodiment, the electrode die-cutting equipment 1 further includes an auxiliary component 14, which is located on the same side of the support component 13 as the laser cutting component 11. The auxiliary component 14 is used to introduce auxiliary gas, which is used to remove impurities generated during the cutting of the electrode 2.

[0102] The auxiliary component 14 can be supplied with auxiliary gas, which is directed at the cut edge of the electrode 2 to help remove impurities generated during the cutting process, including vaporized metal powder, coating particles, etc. For example, the auxiliary component 14 is positioned above the electrode 2.

[0103] Therefore, this embodiment uses an auxiliary component 14 to remove impurities during the die-cutting of the electrode sheet 2, avoids conflict between impurities and the heat dissipation component 12, avoids uneven laser absorption by the electrode sheet 2 caused by impurities, and avoids local overheating of the electrode sheet 2, thereby improving the reliability of the electrode die-cutting equipment 1.

[0104] Furthermore, the auxiliary gas is selected from at least one of nitrogen, helium, neon, argon, krypton, and xenon. For example, the auxiliary gas is nitrogen with a purity greater than or equal to 99.9%.

[0105] The auxiliary gas is a non-oxidizing gas to avoid oxidation of the electrode 2 and to avoid affecting the working performance of the cell.

[0106] And / or, the flow rate of the auxiliary gas is 10L / min to 15L / min, specifically for example, 10L / min, or 10.5L / min, or 11L / min, or 11.5L / min, or 12L / min, or 12.5L / min, or 13L / min, or 13.5L / min, or 14L / min, or 14.5L / min, or 15L / min, etc.

[0107] Therefore, by limiting the flow rate of the auxiliary gas, this embodiment can not only avoid the electrode 2 from shaking and shifting due to excessive flow rate, thus affecting the die-cutting effect of the electrode 2, but also avoid the cleaning effect of impurities due to insufficient flow rate of the auxiliary gas. This ensures that the auxiliary gas does not affect the fixing effect of the electrode 2 and has a sufficient cleaning effect for removing impurities, thereby improving the reliability of the electrode die-cutting equipment 1.

[0108] And / or, the angle between the nozzle into which the auxiliary gas is introduced and the laser beam path is 20° to 40°, specifically, examples include 20°, 22°, 24°, 26°, 28°, 30°, 32°, 34°, 36°, 38°, or 40°, etc. Preferably, the angle between the nozzle into which the auxiliary gas is introduced and the laser beam path is 30°.

[0109] Therefore, by limiting the angle between the nozzle of the auxiliary gas and the laser beam path, this embodiment ensures that the auxiliary gas and the laser beam path do not interfere with each other, thus not affecting the cutting of the electrode sheet 2 and removing impurities during the die-cutting of the electrode sheet 2, thereby improving the reliability of the electrode die-cutting equipment 1.

[0110] Please refer to this as well. Figures 1-4 In one embodiment, the electrode die-cutting device 1 further includes a fixing member 15, which is disposed on one side of the carrier member 13. The fixing member 15 is used to form a negative pressure environment so that the electrode 2 is fixed to the carrier member 13, and also adsorbs impurities generated by the cutting of the electrode 2.

[0111] The fixing member 15 includes a fixing cavity and a suction pump. The suction pump is used to draw gas from the fixing cavity to create a negative pressure environment in the fixing cavity. The fixing cavity is used to fix the electrode 2 to the carrier member 13. Optionally, the fixing member 15 and the heat sink 12 are located on the same side of the carrier member 13, or the fixing member 15 and the laser cutting member 11 are located on the same side of the carrier member 13.

[0112] Optionally, the vacuum degree of the negative pressure environment is -0.08MPa to -0.06MPa, specifically for example, -0.08MPa, -0.075MPa, -0.07MPa, -0.065MPa, or -0.06MPa, etc.

[0113] Optionally, the adsorption force of the fixing element 15 on the electrode 2 is 0.03MPa~0.05MPa, specifically for example, 0.03MPa, 0.035MPa, 0.04MPa, 0.045MPa, or 0.05MPa, etc.

[0114] Therefore, by setting the fixing member 15, the electrode 2 is fixed on the carrier member 13, which avoids the electrode 2 from being displaced during the cutting process, thereby improving the cutting accuracy of the electrode 2; it also adsorbs impurities during the die-cutting of the electrode 2 without affecting the electrode 2, thereby improving the reliability of the electrode die-cutting equipment 1.

[0115] Please refer to this as well. Figures 1-9 This application also provides a die-cutting method for electrode 2, the die-cutting method comprising: S100 provides electrode die-cutting equipment 1 and electrode 2 as described above in this application.

[0116] The specific structures of electrode die-cutting equipment 1 and electrode 2 are as described above in this application and will not be repeated here.

[0117] S200, the electrode 2 is positioned on the support member 13, and the area to be cut of the electrode 2 corresponds to the heat sink 12.

[0118] The electrode 2 is placed on the carrier 13, and the area to be cut of the electrode 2 is aligned with the heat sink 12, so as to provide a basis for subsequent cutting of the electrode 2 and heat exchange between the heat sink 12 and the electrode 2.

[0119] S300, control the laser cutting component 11 to perform laser cutting on the electrode 2, and control the heat dissipation component 12 to exchange heat with the electrode 2 so that the electrode 2 forms an electrode tab 25.

[0120] Optionally, after the coolant is injected into the heat sink 12, the coolant is vented to remove air bubbles. This embodiment can further improve the heat exchange efficiency of the coolant by removing air bubbles.

[0121] Specifically, while controlling the laser cutting of electrode 2, the heat sink 12 is controlled to exchange heat with electrode 2, so that during the die-cutting process, the heat sink 12 can quickly remove excess heat from the area to be cut, suppress the formation of molten beads from the source, reduce the size of molten beads, or even avoid the formation of molten beads, forming a smooth, molten bead-free cutting edge, thereby avoiding affecting the working performance of the battery cell.

[0122] Furthermore, in the step of the laser cutting element 11 cutting the electrode 2, the laser satisfies at least one of the following conditions: The wavelength of the laser is between 1000nm and 1200nm, specifically, examples include 1000nm, 1010nm, 1120nm, 1130nm, 1140nm, 1150nm, 1160nm, 1170nm, 1180nm, 1190nm, or 1200nm. Preferably, the wavelength of the laser is 1064nm.

[0123] And / or, the output power of the laser is 300W~500W, specifically for example, 300W, or 320W, or 340W, or 360W, or 380W, or 400W, or 420W, or 440W, or 460W, or 480W, or 500W, etc.

[0124] And / or, the pulse frequency of the laser is 50kHz to 100kHz, specifically, for example, 50kHz, 60kHz, 70kHz, 80kHz, 90kHz, or 100kHz.

[0125] And / or, the pulse width of the laser is 10ns to 20ns, specifically for example, 10ns, 11ns, 12ns, 13ns, 14ns, 15ns, 16ns, 17ns, 18ns, 19ns, or 20ns, etc.

[0126] And / or, the cutting speed of the laser is 100mm / s to 500mm / s, specifically for example, 100mm / s, or 150mm / s, or 200mm / s, or 250mm / s, or 300mm / s, or 350mm / s, or 400mm / s, or 450mm / s, or 500mm / s, etc.

[0127] And / or, the distance between the focal point of the laser and the preset cutting position of the electrode 2 is ≤0.02mm, specifically, for example, 0.02mm, or 0.015mm, or 0.01mm, or 0.005mm, or 0, etc.

[0128] Different laser parameters can be defined according to the different material properties of electrode 2 to cut electrode 2, thereby improving the cutting effect and efficiency. Furthermore, limiting the distance between the laser focal point and the preset cutting position of electrode 2 ensures concentrated laser energy, further improving the cutting effect and efficiency.

[0129] Please refer to this as well. Figures 1-10 In one embodiment, step S300, which involves controlling the laser cutting component 11 to perform laser cutting on the electrode 2 and controlling the heat sink 12 to exchange heat with the electrode 2, includes: S310, control the heat sink 12 to exchange heat with the electrode 2.

[0130] S320, control the laser cutting component 11 to perform laser cutting on the electrode 2 so that the electrode 2 forms an electrode tab 25.

[0131] S330, control the heat sink 12 to stop working.

[0132] Specifically, first, the heat sink 12 is activated to allow heat exchange between the heat sink 12 and the electrode 2, preparing for subsequent cutting of the electrode 2; then, the laser cutting component 11 is controlled to perform laser cutting on the electrode 2 until the electrode 2 forms an electrode tab 25. During the cutting process of the electrode 2, the heat sink 12 continues to exchange heat with the electrode 2; next, the heat sink 12 is turned off to stop the heat exchange between the heat sink 12 and the electrode 2.

[0133] Furthermore, before the laser cutting component 11 is started, the pre-preparation time for the heat sink 12 to exchange heat with the electrode 2 is ≥3s.

[0134] After the laser cutting component 11 is turned off, the heat sink 12 and the electrode 2 exchange heat for a first continuous working time of ≥5s, and then the heat sink 12 is controlled to stop working.

[0135] Specific examples of preparation time include 3s, 4s, 5s, 6s, 7s, 8s, 9s, 10s, 15s, or 20s.

[0136] The first continuous working time can be exemplified by 5s, 6s, 7s, 8s, 9s, 10s, 15s, or 20s, etc.

[0137] Therefore, by controlling the heat exchange between the heat sink 12 and the electrode 2 before cutting the electrode 2, this embodiment prepares for laser cutting and can quickly and timely remove excess heat from the area to be cut during laser cutting, thereby suppressing the formation of molten beads from the source. It also helps the coolant to achieve a stable flow rate in the flow channel, so that the heat sink 12 can maintain stable heat exchange performance.

[0138] Furthermore, after the electrode 2 is cut, the heat sink 12 continues to exchange heat with the electrode 2 for a period of time before the heat sink 12 is turned off. This can remove the residual heat on the electrode 2 after laser cutting, preventing the electrode 2 from forming molten beads due to residual heat. This better prevents the formation of molten beads in each processing node of the electrode 2 die cutting, forming a smooth, molten bead-free cutting edge, thereby avoiding affecting the working performance of the battery cell.

[0139] Please refer to this as well. Figures 1-11 In another embodiment, the electrode die-cutting equipment 1 further includes an auxiliary component 14, which is located on the same side of the support component 13 as the laser cutting component 11. The auxiliary component 14 is used to introduce auxiliary gas, which is used to remove impurities generated during the cutting of the electrode 2.

[0140] Step S300, in which the laser cutting component 11 cuts the electrode 2, further includes: S340, control the auxiliary component 14 to introduce auxiliary gas to remove impurities generated by cutting the electrode 2; wherein, the angle between the nozzle of the auxiliary gas and the laser optical path is an acute angle.

[0141] Specifically, auxiliary gas can be introduced into auxiliary component 14. The auxiliary gas is aligned with the cut edge of electrode 2 to help remove impurities generated during the cutting of electrode 2. Impurities include vaporized metal powder, coating particles, etc.

[0142] Furthermore, the auxiliary gas is selected from at least one of nitrogen, helium, neon, argon, krypton, and xenon.

[0143] The auxiliary gas is a non-oxidizing gas to avoid oxidation of the electrode 2 and to avoid affecting the working performance of the cell.

[0144] And / or, the flow rate of the auxiliary gas is 10L / min to 15L / min, specifically for example, 10L / min, or 10.5L / min, or 11L / min, or 11.5L / min, or 12L / min, or 12.5L / min, or 13L / min, or 13.5L / min, or 14L / min, or 14.5L / min, or 15L / min, etc.

[0145] And / or, the angle between the nozzle into which the auxiliary gas is introduced and the laser beam path is 20° to 40°, specifically, examples include 20°, 22°, 24°, 26°, 28°, 30°, 32°, 34°, 36°, 38°, or 40°, etc. Preferably, the angle between the nozzle into which the auxiliary gas is introduced and the laser beam path is 30°.

[0146] Therefore, by introducing an auxiliary gas, this embodiment can remove impurities during the die-cutting of the electrode sheet 2, avoid conflict between impurities and the heat sink 12, prevent impurities from causing uneven laser absorption by the electrode sheet 2, and avoid causing local overheating of the electrode sheet 2, thereby improving the reliability of the electrode die-cutting equipment 1.

[0147] Please refer to this as well. Figures 1-12 In another embodiment, the electrode die-cutting equipment 1 further includes a fixing member 15, which is disposed on one side of the carrier member 13. The fixing member 15 is used to form a negative pressure environment so that the electrode 2 is fixed to the carrier member 13, and also adsorbs impurities generated by the cutting of the electrode 2.

[0148] Step S300, which involves controlling the laser cutting component 11 to perform laser cutting on the electrode 2 and controlling the heat sink 12 to exchange heat with the electrode 2, further includes: S350, control the fixing member 15 to form a negative pressure environment so that the electrode 2 is fixed to the carrier 13, and also adsorb the impurities generated by the cutting of the electrode 2.

[0149] Specifically, first, the fixing member 15 is activated to fix the electrode 2 onto the carrier member 13, preparing for the subsequent cutting of the electrode 2; then, the laser cutting member 11 is controlled to perform laser cutting on the electrode 2 until the electrode 2 forms an electrode tab 25. During the cutting process of the electrode 2, the fixing member 15 always fixes the electrode 2; then, the fixing member 15 is closed, allowing the electrode 2 to move through the conveyor.

[0150] Optionally, the vacuum degree of the negative pressure environment is -0.08MPa to -0.06MPa, specifically for example, -0.08MPa, -0.075MPa, -0.07MPa, -0.065MPa, or -0.06MPa, etc.

[0151] Optionally, the adsorption force of the fixing element 15 on the electrode 2 is 0.03MPa~0.05MPa, specifically for example, 0.03MPa, 0.035MPa, 0.04MPa, 0.045MPa, or 0.05MPa, etc.

[0152] Therefore, this embodiment controls the fixing member 15 to fix the electrode 2 on the carrier member 13, thereby preventing the electrode 2 from shifting during the cutting process and improving the cutting accuracy of the electrode 2; it also adsorbs impurities during the die-cutting of the electrode 2 without affecting the electrode 2, thereby improving the reliability of the electrode die-cutting equipment 1.

[0153] Furthermore, after the laser cutting component 11 is turned off, the fixing component 15 forms a negative pressure environment for a second continuous working time of ≥3s, and then the fixing component 15 is controlled to stop working.

[0154] The second continuous working time can be exemplified by 3s, 4s, 5s, 6s, 7s, 8s, 9s, 10s, 15s, or 20s, etc.

[0155] Therefore, in this embodiment, after the electrode 2 is cut, the fixing member 15 is maintained to form a negative pressure environment for a period of time before the fixing member 15 is closed. This can remove the impurities remaining on the electrode 2 after laser cutting and adsorb the impurities during the die-cutting of the electrode 2 without affecting the electrode 2, thereby improving the reliability of the electrode die-cutting equipment 1.

[0156] Please refer to this as well. Figures 1-13 In yet another embodiment, step S200, which controls the electrode 2 to be positioned corresponding to the heat sink 12, includes: S210, control the electrode 2 to be in a flat state.

[0157] For example, the electrode sheet 2 roll is placed at the upper roll of the electrode sheet die-cutting equipment 1, and the electrode sheet 2 is clamped and transported by the cooperation of the conveyor and the smoothing component so that the electrode sheet 2 is in a flat state.

[0158] Furthermore, in the electrode die-cutting equipment 1, the electrode 2 is properly connected to ensure that the electrode 2 is completely flat and fixed to prevent vibration or displacement.

[0159] S220, locate the identification mark of the electrode 2.

[0160] Optionally, an identification device is used to locate the identification mark on the electrode 2. The identification device includes an image recognition device, such as a high-resolution CCD camera.

[0161] For example, a high-resolution CCD camera automatically captures the identification marks on electrode 2.

[0162] S230, according to the identification mark, the area to be cut of the electrode 2 is set to correspond to the heat sink 12.

[0163] For example, based on the identification mark, the position of the electrode 2 relative to the heat sink 12 is adjusted so that the area to be cut of the electrode 2 corresponds to the heat sink 12.

[0164] Furthermore, the distance between the heat sink 12 and the area to be cut of the electrode 2 is ≤0.5mm, specifically, it can be 0.5mm, or 0.45mm, or 0.4mm, or 0.35mm, or 0.3mm, or 0.25mm, or 0.2mm, or 0.15mm, or 0.1mm, or 0.05mm, or 0, etc.

[0165] Therefore, this embodiment sets up a positioning electrode 2 to ensure that the area to be cut of the electrode 2 corresponds to the heat sink 12, thereby improving the heat exchange efficiency between the heat sink 12 and the electrode 2 and eliminating heat dead zones.

[0166] The following is a detailed description of the die-cutting method for the electrode sheet 2 in one embodiment: First, pre-treat electrode 2 by cleaning it and making it flat.

[0167] Clean electrode 2 to ensure its surface is free of oil and dust. Then, unwind electrode 2 using an unwinding mechanism and adjust the tension using tension rollers to prevent wrinkles or stretching deformation, ensuring a smooth cut edge.

[0168] Optionally, the tension roller can be adjusted to a tension of 5 N / m to 8 N / m.

[0169] Then, position electrode 2.

[0170] The electrode 2 is conveyed to the positioning platform by the guide roller. The identification mark of the electrode 2 is positioned by the identification device, and the position of the electrode 2 is adjusted so that the area to be cut of the electrode 2 corresponds to the heat sink 12. Specifically, the edge to be cut is precisely aligned with the serpentine flow channel coverage area of ​​the heat sink 12 to ensure that all the heat generated by cutting is absorbed by the heat sink 12 without any heat exchange dead zones.

[0171] Optionally, the accuracy of the identification mark on the positioning electrode 2 of the identification device is ≤0.01mm.

[0172] Optionally, the distance between the edge to be cut and the serpentine flow channel coverage area of ​​the heat sink 12 is ≤0.5mm.

[0173] Next, fix electrode 2.

[0174] A negative pressure environment is created using the fixing component 15 to fix the position of the electrode 2. The vacuum adsorption of the fixing component 15 fixes the electrode 2, preventing displacement of the electrode 2 during the cutting process and ensuring die-cutting accuracy.

[0175] Optionally, the adsorption force of the fixing element 15 on the electrode 2 is 0.03MPa~0.05MPa.

[0176] Continue, simultaneously running heat sink 12 and laser cutting.

[0177] Start the system coordination program: After positioning is completed, the system sends a signal to drive the pump to start 3 seconds in advance, so that the coolant reaches a stable flow rate in the flow channel. At the same time, the negative pressure adsorption system of the fixed part 15 is started to prepare to adsorb metal powder waste.

[0178] Laser cutting execution: The laser cutting part 11 moves along a preset path, with a cutting speed of 100mm / s-500mm / s. The laser beam is focused on the edge of the metal foil 21, instantly raising the local temperature.

[0179] For example, if the metal foil 21 is made of aluminum, the laser beam is focused on the edge of the aluminum material, instantly raising the local temperature to over 2467°C, causing the aluminum material to vaporize and form a cutting seam.

[0180] Liquid cooling real-time heat control: During the cutting process, the lower surface of the electrode 2 is close to the heat sink 12. Heat is conducted between the electrode 2 and the heat sink 12, and the forced convection of the coolant achieves a dual-mechanism heat dissipation.

[0181] Of the laser energy absorbed by electrode 2, only a small amount is used for vaporization cutting to meet the separation requirements, while the remaining heat is quickly transferred to heat sink 12 through electrode 2.

[0182] Optionally, the coolant flows within the channel at a flow rate of 0.8 m / s to 1.2 m / s.

[0183] The coolant quickly removes heat, keeping the temperature of the heat-affected zone at the cutting edge of electrode 2 below 200℃, which is far below the melting point of aluminum (660℃), thus preventing excess aluminum material at the edge from melting.

[0184] Furthermore, the negative pressure adsorption system of the fixing component 15 simultaneously adsorbs the aluminum powder and a small amount of vaporized condensate generated during cutting, preventing the aluminum powder from accumulating and melting again to form molten beads.

[0185] When the laser-cut part 11 reaches the preset endpoint, the laser is turned off, the drive pump is turned off after a 5-second delay to remove residual heat, and the pressure adsorption system of the negative fixing part 15 continues to run for 3 seconds to ensure that the waste is completely discharged.

[0186] Finally, electrode 2 is cleaned and dried.

[0187] Waste separation: After electrode 2 leaves the positioning platform via the conveyor roller, the waste generated by die cutting, such as aluminum foil edges, is collected through the waste recycling channel to avoid contact with the finished electrode 2 and causing pollution.

[0188] Electrode 2 cleaning: High-pressure nitrogen gas is used to purge the electrode 2 along its cutting edge to remove residual trace metal powder, i.e., small particles that have not formed molten beads, ensuring that the surface of electrode 2 is free of impurities.

[0189] Optionally, the pressure of high-pressure nitrogen purging is 0.3MPa-0.5MPa.

[0190] Rewinding and storage: After drying, electrode 2 is rewound by a tension control mechanism. During the rewinding process, friction on the edges of electrode 2 is avoided. After rewinding, it is sealed with an aluminum-plastic composite film and stored in an environment with a temperature of 20℃-25℃ and a humidity of ≤25%RH.

[0191] Optionally, the winding tension of the tension control mechanism is 8N / m to 10N / m.

[0192] In summary, the die-cutting method for electrode 2 provided in this application adopts the electrode die-cutting equipment 1 provided above in this application. A heat sink 12 is provided in the electrode die-cutting equipment 1. The heat sink 12 can exchange heat with the electrode 2 during die-cutting, quickly remove excess heat from the area to be cut, suppress the formation of molten beads from the source, reduce the size of molten beads, or even avoid the formation of molten beads, forming a smooth, molten bead-free cutting edge, thereby avoiding affecting the working performance of the battery cell.

[0193] Furthermore, the heat sink 12 can be seamlessly integrated into laser die-cutting production lines with relevant technologies without requiring significant equipment modifications, demonstrating strong compatibility. Adding the heat sink 12 does not affect die-cutting performance; cutting speed, precision, and edge quality remain at the original levels. Moreover, due to the reduction in the heat-affected zone, the smoothness of the cut edges is further improved.

[0194] Specifically, the anti-molten bead effect is significant. By using the heat sink 12 to precisely control the heat, the size of the molten bead is reduced from 5-15μm to less than 5μm, completely avoiding the risks of micro short circuits and thermal runaway.

[0195] It does not affect the die-cutting performance. The cutting speed, accuracy and edge quality remain at the original level. In fact, due to the reduction of the heat-affected zone, the heat-affected zone is reduced to 20μm~50μm, and the edge flatness is improved by 30%.

[0196] It has strong mass production compatibility, and the process can be seamlessly integrated into existing laser die-cutting production lines. Only the heat sink 12 and linkage control program need to be added, without the need for major equipment modifications.

[0197] This application also provides a positive electrode sheet, which is prepared by the die-cutting method of the electrode sheet provided above in this application.

[0198] Furthermore, the positive electrode includes a metal foil and a ceramic edge layer disposed on the metal foil. The metal foil includes a light foil area and an overlapping area. The ceramic edge layer is disposed away from the light foil area and is disposed in the overlapping area. The light foil area is closer to the edge of the metal foil than the overlapping area.

[0199] The positive electrode has a tab, which is located in the foil area and / or in the foil area and the overlapping area.

[0200] Specifically, for the tab, the width of the tab gradually increases along the direction from the edge of the positive electrode to the center of the positive electrode.

[0201] The tabs are trapezoidal or trapezoidal in shape. This design improves current density variation, enhances current uniformity, reduces resistance, prevents localized overheating at the base of the tab, and improves the structural reliability of the tabs.

[0202] This application also provides a battery, which includes a negative electrode, a separator, an electrolyte, and a positive electrode as described above.

[0203] In summary, the positive electrode sheet and battery provided in this embodiment, by adopting the electrode die-cutting equipment and electrode die-cutting method provided in this application, by setting a heat dissipation component in the electrode die-cutting equipment, the heat dissipation component can exchange heat with the electrode sheet during die-cutting, quickly remove excess heat from the area to be cut, suppress the formation of molten beads from the source, reduce the size of molten beads, or even avoid the formation of molten beads, forming a smooth, molten bead-free cutting edge, thereby avoiding affecting the working performance of the battery cell.

[0204] Furthermore, the heat sink can be seamlessly integrated into laser die-cutting production lines with relevant technologies without requiring significant equipment modifications, demonstrating strong compatibility. Adding the heat sink does not affect die-cutting performance; cutting speed, precision, and edge quality remain at the original levels. Moreover, the reduced heat-affected zone further improves the smoothness of the cut edges.

[0205] Unless otherwise stated or in case of conflict, the terms or phrases used in this application shall have the following meanings: In this application, terms such as "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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0206] In this application, "one or more" refers to any one, any two, or any two or more of the listed items. "Several" refers to any two or more.

[0207] In this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0208] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0209] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form yet another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0210] The above description represents some embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. An electrode die-cutting device, characterized in that, The electrode die-cutting equipment includes: Laser-cut parts, used to emit laser light; Support element, used to support the electrode sheet; A heat sink is disposed on the side of the support member away from the laser cutting member. The heat sink is disposed corresponding to the area to be cut of the electrode sheet and is used for heat exchange with the electrode sheet.

2. The electrode die-cutting equipment as described in claim 1, characterized in that, The heat sink includes a housing with channels inside the housing for containing coolant.

3. The electrode die-cutting equipment as described in claim 2, characterized in that, The housing is provided with at least one isolation element, which is used to divide the flow channel into multiple interconnected sub-flow channels; And / or, at least one flow guide is provided in the flow channel.

4. The electrode die-cutting equipment as described in claim 2, characterized in that, The housing is selected from metal parts; And / or, the temperature of the coolant is 18°C ​​to 25°C; And / or, the resistivity of the coolant is ≤10. 6 Ω·cm; And / or, the flow rate of the coolant is 0.8 m / s to 1.2 m / s.

5. The electrode die-cutting equipment as described in claim 2, characterized in that, The heat sink further includes a protective layer, at least a portion of which is located on the side of the housing facing the laser-cut component.

6. The electrode die-cutting equipment as described in claim 5, characterized in that, The protective layer is selected from at least one of a ceramic layer, a boron nitride layer, a yttrium oxide layer, and an aluminum oxide layer.

7. The electrode die-cutting equipment as described in claim 1, characterized in that, The heat sink and the electrode are spaced apart, and the gap between the heat sink and the electrode is 0.5mm~1mm; The distance between the heat sink and the area to be cut of the electrode is ≤0.5mm; The wavelength of the laser is 1000nm~1200nm.

8. The electrode die-cutting equipment as described in claim 1, characterized in that, The electrode die-cutting equipment also includes an auxiliary component, which is located on the same side of the support component as the laser cutting component. The auxiliary component is used to introduce auxiliary gas, which is used to remove impurities generated during the cutting of the electrode.

9. The electrode die-cutting equipment as described in claim 8, characterized in that, The auxiliary gas is selected from at least one of nitrogen, helium, neon, argon, krypton, and xenon; And / or, the flow rate of the auxiliary gas is 10 L / min to 15 L / min; And / or, the angle between the nozzle through which the auxiliary gas is introduced and the laser beam path is 20° to 40°.

10. The electrode die-cutting equipment as described in claim 1, characterized in that, The electrode die-cutting equipment also includes a fixing component, which is located on one side of the carrier. The fixing component is used to create a negative pressure environment so that the electrode is fixed to the carrier and also adsorbs impurities generated during the cutting of the electrode.

11. A method for die-cutting an electrode sheet, characterized in that, The die-cutting method includes: Provides the electrode die-cutting equipment and electrode as described in claim 1; The electrode is positioned on the support member, and the area to be cut of the electrode corresponds to the heat dissipation member. The laser cutting component is controlled to perform laser cutting on the electrode sheet, and the heat sink is controlled to exchange heat with the electrode sheet so that the electrode sheet forms an electrode tab.

12. The die-cutting method as described in claim 11, characterized in that, In the step of the laser cutting component cutting the electrode sheet, the laser satisfies at least one of the following conditions: The wavelength of the laser is 1000nm~1200nm; The output power of the laser is 300W~500W; The pulse frequency of the laser is 50kHz~100kHz; The pulse width of the laser is 10ns~20ns; The laser cutting speed is 100mm / s to 500mm / s; The distance between the focal point of the laser and the preset cutting position of the electrode is ≤0.02mm.

13. The die-cutting method as described in claim 11, characterized in that, The steps of controlling the laser cutting component to perform laser cutting on the electrode sheet and controlling the heat sink to exchange heat with the electrode sheet include: Control the heat exchange between the heat sink and the electrode; The laser cutting component is controlled to perform laser cutting on the electrode sheet to form an electrode tab; Control the heat sink to stop working.

14. The die-cutting method as described in claim 13, characterized in that, Before the laser cutting component is started, the pre-preparation time for heat exchange between the heat sink and the electrode is ≥3s; After the laser cutting component is turned off, the heat sink and the electrode exchange heat for a first continuous working time of ≥5s, and then the heat sink is controlled to stop working.

15. The die-cutting method as described in claim 11, characterized in that, The electrode die-cutting equipment also includes an auxiliary component, which is located on the same side of the support component as the laser cutting component. The auxiliary component is used to introduce auxiliary gas, which is used to remove impurities generated during the cutting of the electrode. The step of cutting the electrode sheet using the laser cutting component further includes: The auxiliary component is controlled to introduce auxiliary gas to remove impurities generated during the cutting of the electrode; wherein the angle between the nozzle through which the auxiliary gas is introduced and the laser optical path is an acute angle.

16. The die-cutting method as described in claim 11, characterized in that, The electrode die-cutting equipment also includes a fixing component, which is located on one side of the carrier component. The fixing component is used to create a negative pressure environment so that the electrode is fixed to the carrier component and also adsorbs impurities generated during the cutting of the electrode. The steps of controlling the laser cutting component to perform laser cutting on the electrode sheet and controlling the heat sink to exchange heat with the electrode sheet further include: The fixing member is controlled to form a negative pressure environment so that the electrode is fixed to the carrier and also adsorbs impurities generated during the cutting of the electrode.

17. The die-cutting method as described in claim 16, characterized in that, After the laser cutting component is shut down, the fixture creates a negative pressure environment for a second continuous working time of ≥3s, and then the fixture is controlled to stop working.

18. The die-cutting method as described in claim 11, characterized in that, The step of controlling the electrode to correspond to the heat sink includes: The electrode is kept in a flat state. Identification marks for locating the electrode sheets; According to the identification mark, the area to be cut of the electrode is set to correspond to the heat sink.

19. A positive electrode plate, characterized in that, The positive electrode sheet is prepared by the die-cutting method of the electrode sheet as described in any one of claims 11-18.

20. A battery, characterized in that, The battery includes a negative electrode, a separator, an electrolyte, and a positive electrode as described in claim 19.

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