Pole piece and diaphragm compounding device, compounding method and compounding unit
By using the arc-shaped design of the electrode and separator composite device and the use of a silicone layer, the problem of poor composite effect caused by bending of the single-sided coated electrode was solved, achieving close contact and stable bonding between the electrode and separator, thus improving battery performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-25
- Publication Date
- 2026-04-03
AI Technical Summary
Single-sided coated electrodes are prone to bending during the composite process, resulting in poor composite effect between the electrode and the separator. The active layer is easily damaged or detached, affecting the electrochemical performance and cycle life of the battery.
The electrode and diaphragm composite device is adopted. By setting the end cap with arc-shaped concave and convex parts, the electrode is bent in the opposite direction. Combined with the silicone layer to provide elastic buffer, it ensures that the active layer and the diaphragm are in full contact. The mechanical interlocking structure and chemical bonding are formed by hot pressing and laser cutting.
It improves the interfacial bonding effect between the electrode and the separator, ensures structural stability, reduces the risk of active layer shedding, and enhances the energy density and cycle life of the battery.
Smart Images
Figure CN121790692A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to an electrode and separator composite device, composite method, and composite unit. Background Technology
[0002] Pouch batteries, with their advantages of high energy density, strong safety, and flexible design, have become an important power source in the consumer electronics field, and their performance requirements continue to upgrade as application scenarios expand. Among them, the composite process of electrode sheets and separators directly affects the battery's cycle life, energy density, and safety.
[0003] When the electrode is a single-sided coated electrode, the electrode consists of a current collector and a single-sided active material layer. During the coating, drying and rolling processes, the electrode may bulge and bend towards the active material layer, which can easily lead to poor composite effect between the electrode and the separator. The active layer is also prone to damage or detachment, which affects the electrochemical performance and cycle life of the soft-pack battery. Summary of the Invention
[0004] This application provides an electrode and diaphragm composite device, composite method, and composite unit, which can improve the bending phenomenon of single-sided coated electrode and enhance the composite effect of electrode and diaphragm, thereby at least partially solving the above-mentioned technical problems.
[0005] To achieve the above objectives, according to a first aspect of this application, an electrode and diaphragm composite device is provided for the composite of an electrode and a diaphragm, wherein the electrode includes a current collector and an active layer coated on one side of the current collector, and the diaphragm is disposed on one side of the active layer. The composite device includes: The first end cap has a recessed portion, which includes an arc-shaped concave surface. The second end cap has a protrusion that matches the recessed portion, the protrusion including an arc-shaped convex surface; The radius of the arc-shaped concave surface is 50mm-300mm. The current collector side of the electrode is suitable for being placed close to the first end cap, and the active layer side of the electrode is suitable for being placed close to the second end cap.
[0006] The electrode and separator composite device provided in this application is used for the composite of electrode and separator. The electrode includes a current collector and an active layer coated on one side of the current collector, i.e., a single-sided coated electrode. Due to uneven stress in single-sided coated electrodes, the electrode bends and bulges towards the active layer, making it difficult to ensure sufficient contact between the active layer and the separator during the composite process, resulting in gaps and poor composite effect. This application addresses this by providing a recessed portion on the first end cap and a protruding portion on the second end cap that matches the recessed portion. This causes the electrode to bend in the opposite direction during the composite process, with the side of the electrode containing the current collector bulging and bending. This ensures sufficient contact between the separator and the active layer and maintains the structural stability of the active layer, thereby improving the interfacial composite effect between the electrode and the separator. By setting the radius of the arc-shaped concave surface to 50mm-300mm, the flatness after composite is ensured, improving the composite effect, while avoiding excessive reverse bending that could cause the active layer to detach. In other words, the electrode and diaphragm composite device provided in this application can improve the bending phenomenon of single-sided coated electrodes, so that the active layer can fully contact the diaphragm during the electrode and diaphragm composite process, thereby improving the interfacial composite effect of the electrode and diaphragm, and ensuring structural stability and reducing the risk of active layer detachment.
[0007] In some embodiments, a silicone layer is provided on the surface of the protrusion.
[0008] During the composite process of electrode and diaphragm, the protrusion of the second end cap will directly contact the diaphragm. By setting a silicone layer on the surface of the protrusion, a good elastic buffering effect can be provided, achieving soft contact between the second end cap and the diaphragm, reducing the risk of diaphragm damage and active layer detachment, achieving dense composite between the diaphragm and electrode, and improving the interface composite effect.
[0009] In some embodiments, the thickness of the silicone layer is 6mm-10mm.
[0010] By keeping the thickness of the silicone layer within the above range, sufficient buffering performance can be provided, pressure uniformity during the composite process can be improved, and the cross-sectional composite effect between the electrode and the diaphragm can be guaranteed.
[0011] In some embodiments, the surface roughness Ra of the recess is ≤1.6μm; And / or, the surface roughness Ra of the protrusion is ≤1.6μm.
[0012] By ensuring the surface roughness of the recesses is within the aforementioned range, burrs on the recesses can be reduced, lowering the risk of electrode puncture and ensuring pressure uniformity throughout. Similarly, by ensuring the surface roughness of the protrusions is within the aforementioned range, the risk of electrode and diaphragm puncture can be reduced, and pressure uniformity throughout can be ensured.
[0013] According to a second aspect of this application, a method for composite electrode and separator is also provided, comprising composite electrode and separator using the composite apparatus described above, including: Provide a first and a second head; The electrode is placed in the recess of the first end cap, wherein the side of the electrode with the current collector is positioned close to the first end cap; The diaphragm is placed on the surface of the electrode with the active layer. The electrode and the diaphragm are hot-pressed using a second end cap to obtain a composite structure; The composite structure is cut to obtain composite units.
[0014] The composite method provided in this application possesses all the beneficial effects of the composite device described above, which will not be repeated here. Furthermore, by hot-pressing the electrode and the separator, the active layer and the separator can undergo plastic deformation, thereby forming a mechanically interlocked structure, and the binder in the separator and the electrode can undergo a cross-linking reaction to form chemical bonds. That is, the interfacial bonding effect between the electrode and the separator is ensured through the combined effect of physical adhesion and chemical bonding.
[0015] In some embodiments, the electrode and the diaphragm are hot-pressed using a second end cap, including: Under conditions of 70℃-90℃ and 0.2MPa-0.6MPa, the second end cap is used to hot-press the electrode and diaphragm for 2s-4s.
[0016] By maintaining a temperature of 70℃-90℃, excessive softening and decomposition of the binder in the active layer can be prevented, reducing the risk of powder shedding from the active layer and ensuring thermal adhesion between the active layer and the separator, thus guaranteeing the composite effect. Maintaining a pressure range of 0.2MPa-0.6MPa ensures sufficient compression between the electrode and the separator, allowing for thorough bonding, reducing gaps between them, and improving the interfacial composite effect. Controlling the hot-pressing time to 2s-4s ensures full contact between the electrode and the separator, resulting in tight bonding under the influence of temperature and pressure, and reducing the risk of oxidation or damage to the active layer due to excessively long hot-pressing times.
[0017] In some embodiments, cutting the composite structure includes: A laser is used to cut the composite structure on one side to sever the diaphragm; the laser frequency is 50kHz-70kHz and the pulse width is 0.4ms-0.6ms.
[0018] Compared to traditional cutting methods, laser cutting offers higher precision. By performing single-sided laser cutting on the composite unit, damage to the electrode beneath the diaphragm can be minimized while cutting the diaphragm. By controlling the laser frequency and pulse width within the aforementioned ranges, the kerf width and energy input during single-sided cutting can be controlled, ensuring kerf flatness, guaranteeing cutting accuracy, and reducing the impact on the electrode.
[0019] According to a third aspect of this application, a composite unit is also provided, comprising an electrode and a diaphragm; The electrode includes a current collector and an active layer, and the separator includes a base membrane and an adhesive layer disposed on at least one side of the base membrane; The composite unit is formed by composite device as described above, and / or composite method as described above.
[0020] The composite unit provided in this application has all the beneficial effects of the composite device described above, which will not be repeated here.
[0021] In some embodiments, the thickness of the electrode is 60μm-120μm; And / or, the thickness of the current collector is 10μm-25μm; And / or, the thickness of the diaphragm is 10μm-20μm.
[0022] By ensuring the electrode thickness falls within the aforementioned range, high energy density, structural strength, and stability can be guaranteed. Similarly, ensuring the current collector thickness falls within the aforementioned range provides good support for the active layer, ensuring electrode structural strength, reducing bending in single-sided coated electrodes, and contributing to increased energy density and weight reduction. Furthermore, ensuring the separator thickness falls within the aforementioned range guarantees mechanical properties and thermal stability, reduces short-circuit risk, and further contributes to increased energy density, reduced internal resistance, and cost control.
[0023] In some embodiments, the diaphragm includes a base membrane and an adhesive layer disposed on at least one side of the base membrane.
[0024] By using a diaphragm consisting of a base membrane and an adhesive layer disposed on at least one side of the base membrane, a tight bond can be achieved between the electrode and the diaphragm through adhesive bonding, ensuring the interfacial composite effect between the two and reducing the impedance between the electrode and the diaphragm. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.
[0026] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.
[0027] Figure 1 This is a schematic diagram of the structure of the composite device provided in the embodiments of this application; Figure 2 This is a schematic cross-sectional view of the composite unit provided in the embodiments of this application; Figure 3 This is a three-dimensional structural schematic diagram of the first end cap provided in the embodiment of this application; Figure 4 This is a side view of the first wind-sealing head provided in an embodiment of this application; Figure 5 yes Figure 4 Sectional view at point AA; Figure 6 This is a three-dimensional structural schematic diagram of the second end cap provided in an embodiment of this application; Figure 7 This is a side view of the second head provided in an embodiment of this application; Figure 8 yes Figure 7 Sectional view at point BB; Figure 9 This is a schematic diagram of laser cutting of composite units provided in the embodiments of this application.
[0028] Explanation of reference numerals in the attached figures: 100. Electrode and diaphragm composite device; 10. First end cap; 11. Recessed portion; 111. Arc-shaped concave surface; 112. Vacuum hole; 12. First base; 121. Connecting hole; 122. First heating hole; 20. Second end cap; 21. Protrusion; 211. Arc-shaped convex surface; 212. Silicone layer; 22. Second base; 221. Second heating hole; 30. Electrode; 31. Current collector; 32. Active layer; 40. Diaphragm. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.
[0030] Firstly, such as Figures 1-8As shown, this application provides an electrode and diaphragm composite device 100 for composite electrode 30 and diaphragm 40. The electrode 30 includes a current collector 31 and an active layer 32 coated on one side of the current collector 31. The diaphragm 40 is disposed on one side of the active layer 32. The composite device includes a first end cap 10 and a second end cap 20. The first end cap 10 has a recess 11, which includes an arc-shaped concave surface 111. The second end cap 20 has a protrusion 21 that matches the recess 11, which includes an arc-shaped convex surface 211. The radius of the arc of the arc-shaped concave surface 111 is 50mm-300mm. The side of the current collector 31 in the electrode 30 is adapted to be disposed close to the first end cap 10, and the side of the active layer 32 in the electrode 30 is adapted to be disposed close to the second end cap 20.
[0031] The electrode and diaphragm composite device 100 provided in this application is used for the composite of electrode 30 and diaphragm 40, wherein, as Figure 2 As shown, the electrode 30 includes a current collector 31 and an active layer 32 coated on one side of the current collector 31, i.e., a single-sided coated electrode 30. Due to uneven stress in the single-sided coated electrode 30, the electrode 30 bulges and bends towards the active layer 32. During the composite process, it is difficult for the active layer 32 to ensure sufficient contact with the separator 40, resulting in blank areas and poor composite effect. This application provides a recessed portion 11 on the first end cap 10 and a protruding portion 21 on the second end cap 20 that matches the recessed portion 11. During the composite process of the electrode 30 and the separator 40, the electrode 30 bends in the opposite direction, with the side of the electrode 30 containing the current collector 31 bulging and bending. This ensures sufficient contact between the separator 40 and the active layer 32 and guarantees the structural stability of the active layer 32, thereby improving the interfacial composite effect between the electrode 30 and the separator 40. By setting the radius of the arc of the concave surface 111 to 50mm-300mm, the flatness after lamination can be guaranteed, the lamination effect can be improved, and excessive reverse bending can be avoided, which could cause the active layer to fall off. In other words, the electrode and diaphragm lamination device 100 provided in this application can improve the bending phenomenon of the single-sided coated electrode 30, so that the active layer 32 can fully contact the diaphragm 40 during the lamination process of the electrode 30 and the diaphragm 40, thereby improving the interfacial lamination effect of the electrode 30 and the diaphragm 40, and ensuring structural stability while reducing the risk of the active layer 32 falling off.
[0032] For example, the radius of the arc-shaped concave surface 111 can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm or 300mm.
[0033] It is understandable that the larger the radius of the arc-shaped surface, the smaller its curvature. By keeping the radius of the arc-shaped concave surface 111 within the range of 50mm-300mm, the curvature of the arc-shaped concave surface 111 can be controlled within a certain range. This allows the electrode 30 to bend in the reverse direction within an appropriate range, compensating for the bending caused by single-sided coating and reducing the damage and detachment of the active layer 32 caused by excessive reverse bending. This ensures that during the composite process, the active layer 32 and the separator 40 are tightly bonded, forming an excellent bonding interface. The electrode 30 can be either a positive electrode 30 or a negative electrode 30.
[0034] In some embodiments, such as Figure 8 As shown, a silicone layer 212 is provided on the surface of the protrusion 21.
[0035] During the composite process of electrode 30 and diaphragm 40 using a composite device, the protrusion 21 of the second end cap 20 will directly contact the diaphragm 40. By providing a silicone layer 212 on the surface of the protrusion 21, a good elastic buffering effect can be provided, achieving soft contact between the second end cap 20 and the diaphragm 40, reducing the risk of damage to the diaphragm 40 and detachment of the active layer 32, achieving dense composite between the diaphragm 40 and electrode 30, and improving the interface composite effect.
[0036] For example, the heat resistance range of the silicone layer 212 can be 180℃-220℃, and the pressure resistance range can be 0.4MPa-0.6MPa. By ensuring that the heat resistance range and pressure resistance range of the silicone layer 212 are within the above ranges, it can be guaranteed that the composite device can withstand sufficient temperature and pressure during the composite process of the electrode 30 and the diaphragm 40, thus ensuring the composite effect.
[0037] In some embodiments, such as Figures 6-8 As shown, the edges of the silicone layer 212 are chamfered. The chamfered structure can disperse stress, reduce stress concentration in the silicone layer 212, and lower the risk of edge tearing.
[0038] In some embodiments, the thickness of the silicone layer 212 is 6mm-10mm.
[0039] By keeping the thickness of the silicone layer 212 within the above range, sufficient buffering performance can be provided, pressure uniformity during the composite process can be improved, and the cross-sectional composite effect between the electrode 30 and the diaphragm 40 can be guaranteed.
[0040] For example, the thickness of the silicone layer 212 can be 6 mm, 6.5 mm, 7 mm, 7.5 mm or 8 mm.
[0041] In some embodiments, such as Figure 3As shown, the first end cap 10 also includes a first base 12, and the recessed portion 11 is stacked with the first base 12.
[0042] By layering the recessed portion 11 and the first base 12 in the first end cap 10, the structural strength and stability of the first end cap 10 can be guaranteed, and the installation and fixing of the first end cap 10 can be facilitated.
[0043] In some embodiments, such as Figure 6 As shown, the second end cap 20 also includes a second base 22, with the protrusion 21 and the second base 22 stacked together.
[0044] By layering the protrusion 21 in the second end cap 20 and the second base 22, the structural strength and stability of the second end cap 20 can be guaranteed, and the installation and fixing of the second end cap 20 can be facilitated.
[0045] In some embodiments, such as Figure 3 As shown, a vacuum hole 112 is provided on the recessed part 11, and a connection hole 121 is provided on the first base 12. The vacuum hole 112 is connected to the vacuum pump through the connection hole 121.
[0046] By setting vacuum hole 112 and connection hole 121, a negative pressure can be generated at vacuum hole 112 by turning on vacuum pump during the composite process, so that electrode 30 is adsorbed on the surface of recess 11, ensuring the stability of electrode 30 during the composite process and reducing the risk of misalignment during the composite process.
[0047] In some embodiments, such as Figure 3 As shown, a first heating hole 122 is provided on the first base 12, and the first heating hole 122 is used to install the heating component.
[0048] By providing a first heating hole 122 on the first base 12, the working temperature of the first end cap 10 can be controlled by the heating assembly to meet the temperature requirements for composite bonding.
[0049] In some embodiments, such as Figure 6 As shown, a second heating hole 221 is provided on the second base 22, and the second heating hole 221 is used to install the heating component.
[0050] Similarly, by providing a second heating hole 221 on the second base 22, the working temperature of the second end cap 20 can be controlled by the heating assembly to meet the temperature conditions required for composite bonding.
[0051] In some embodiments, the surface roughness Ra of the recess 11 is ≤1.6μm.
[0052] By ensuring that the surface roughness of the recess 11 is within the aforementioned range, burrs on the recess 11 can be reduced, the risk of the electrode 30 being punctured can be lowered, and pressure uniformity can be guaranteed at all locations.
[0053] In some embodiments, the surface roughness Ra of the protrusion 21 is ≤1.6μm.
[0054] By ensuring that the surface roughness of the protrusion 21 is within the aforementioned range, the risk of the electrode 30 and the diaphragm 40 being punctured can be reduced, and pressure uniformity can be guaranteed at all locations.
[0055] Secondly, embodiments of this application also provide a method for composite electrode and diaphragm, wherein the electrode 30 and diaphragm 40 are composited using the composite apparatus described above, comprising: Provide a first end cap 10 and a second end cap 20; The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 having the current collector 31 is disposed close to the first end cap 10. The diaphragm 40 is placed on the surface of the electrode 30 with the active layer 32. The electrode 30 and the diaphragm 40 are hot-pressed using the second end cap 20 to obtain a composite structure; The composite structure is cut to obtain composite units.
[0056] The composite method for electrode 30 and diaphragm 40 provided in this application has all the beneficial effects of the composite device described above, which will not be repeated here. Furthermore, by hot-pressing electrode 30 and diaphragm 40, the active layer 32 and diaphragm 40 can undergo plastic deformation, thereby forming a mechanically interlocked structure, and the binder in diaphragm 40 can undergo a cross-linking reaction with electrode 30, forming chemical bonds. That is, the interfacial bonding effect between electrode 30 and diaphragm 40 is ensured through the combined effect of physical adhesion and chemical bonding.
[0057] In some embodiments, the electrode 30 and the diaphragm 40 are hot-pressed using a second end cap 20, including: Under conditions of 70℃-90℃ and 0.2MPa-0.6MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 2s-4s.
[0058] By maintaining a temperature of 70℃-90℃, excessive softening and decomposition of the binder in the active layer 32 can be prevented, reducing the risk of powder shedding from the active layer 32 and ensuring thermal adhesion between the active layer 32 and the separator 40, thus guaranteeing the composite effect. By maintaining a pressure within the range of 0.2MPa-0.6MPa, the tightness between the electrode 30 and the separator 40 can be ensured, allowing for full bonding between them, reducing gaps between them, and improving the interfacial composite effect. By controlling the hot-pressing time to 2s-4s, sufficient contact between the electrode 30 and the separator 40 can be ensured, resulting in tight bonding under the influence of temperature and pressure, and reducing the risk of oxidation or damage to the active layer 32 due to excessively long hot-pressing times.
[0059] For example, the temperature can be 70°C, 75°C, 80°C, 85°C or 90°C, the pressure can be 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa or 0.6MPa, and the hot pressing time can be 2s, 3s or 4s.
[0060] In some embodiments, cutting the composite structure includes: A laser is used to cut the composite structure on one side to sever the diaphragm 40; wherein the laser frequency is 50kHz-70kHz and the pulse width is 0.4ms-0.6ms.
[0061] Compared to traditional cutting methods, laser cutting offers higher precision. By performing single-sided laser cutting on the composite structure, damage to the electrode 30 beneath the diaphragm 40 can be reduced while cutting through the diaphragm 40. By controlling the laser frequency and pulse width within the aforementioned ranges, the kerf width and energy input during single-sided cutting can be controlled, ensuring kerf flatness, guaranteeing cutting accuracy, and minimizing impact on the electrode 30.
[0062] For example, the laser frequency can be 50kHz, 55kHz, 60kHz, 65kHz or 70kHz, and the pulse width can be 0.4ms, 0.5ms or 0.6ms.
[0063] like Figure 9 As shown, the diaphragm 40 and multiple electrode sheets 30 are hot-pressed to obtain a composite unit, which is then separated into composite units by cutting. To prevent damage to the electrode sheets below the diaphragm 40, a single-sided laser cutting method is used along... Figure 9 The diaphragm 40 is cut at the position indicated by the dashed line.
[0064] Thirdly, embodiments of this application also provide a composite unit, including an electrode 30 and a diaphragm 40; The electrode 30 includes a current collector 31 and an active layer 32, and the diaphragm 40 includes a base film and an adhesive layer disposed on at least one side of the base film; The composite unit is formed by combining the electrode and diaphragm composite device as described above, and / or by combining the composite method as described above.
[0065] The composite unit provided in this application has all the beneficial effects of the composite device described above, which will not be repeated here.
[0066] In some embodiments, the thickness of the electrode 30 is 60 μm-120 μm.
[0067] By ensuring that the thickness of electrode 30 is within the aforementioned range, a high energy density can be guaranteed, as well as the structural strength and stability of electrode 30.
[0068] For example, the thickness of the electrode 30 can be 60μm, 70μm, 80μm, 90μm, 100μm, 110μm or 120μm.
[0069] In some embodiments, the thickness of the current collector 31 is 10 μm-25 μm.
[0070] By ensuring that the thickness of the current collector 31 is within the aforementioned range, it can provide good support for the active layer 32, guarantee the structural strength of the electrode 30, reduce the bending degree of the single-sided coated electrode 30, and help improve the energy density of the electrode 30, thereby achieving the lightweighting of the electrode 30.
[0071] For example, the thickness of the current collector 31 can be 10 μm, 15 μm, 20 μm or 25 μm.
[0072] In some embodiments, the thickness of the diaphragm 40 is 10 μm-20 μm.
[0073] By ensuring that the thickness of the diaphragm 40 is within the aforementioned range, mechanical properties and thermal stability can be guaranteed, short-circuit risk can be reduced, and energy density can be increased, internal resistance can be reduced, and costs can be controlled.
[0074] For example, the thickness of the diaphragm 40 can be 10 μm, 12 μm, 15 μm, 18 μm or 20 μm.
[0075] In some embodiments, the diaphragm 40 includes a base membrane and an adhesive layer disposed on at least one side of the base membrane.
[0076] Since the diaphragm 40 includes a base film and an adhesive layer disposed on at least one side of the base film, the electrode 30 and the diaphragm 40 can be tightly bonded by adhesive bonding, ensuring the interfacial composite effect between the two and reducing the impedance between the electrode 30 and the diaphragm 40.
[0077] The embodiments of this application are further illustrated below with reference to specific examples. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. Experimental methods in the following embodiments that do not specify specific conditions are generally performed according to the conditions recommended by the manufacturer.
[0078] Example 1 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 175 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface of the protrusion 21 is provided with a silicone layer 212 with a thickness of 8 mm, and the surface roughness Ra of the silicone layer 212 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40 and obtain the composite unit; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0079] Example 2 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 50 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface of the protrusion 21 is provided with a silicone layer 212 with a thickness of 8 mm, and the surface roughness Ra of the silicone layer 212 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40 and obtain the composite unit; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0080] Example 3 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 300 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface of the protrusion 21 is provided with a silicone layer 212 with a thickness of 8 mm, and the surface roughness Ra of the silicone layer 212 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40 and obtain the composite unit; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0081] Example 4 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 120 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface of the protrusion 21 is provided with a silicone layer 212 with a thickness of 8 mm, and the surface roughness Ra of the silicone layer 212 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40, and the composite unit of electrode 30 and diaphragm 40 is obtained; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0082] Example 5 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 200 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface of the protrusion 21 is provided with a silicone layer 212 with a thickness of 8 mm, and the surface roughness Ra of the silicone layer 212 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40 and obtain the composite unit; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0083] Example 6 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 175 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface roughness Ra of the protrusion 21 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40, and the composite unit of electrode 30 and diaphragm 40 is obtained; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0084] Comparative Example 1 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 and the second end cap 20 are both planar structures, the surface of the second end cap 20 is provided with a silicone layer 212 with a thickness of 8mm, and the surface roughness Ra of the first end cap 10 and the second end cap 20 is 1.6μm; (2) The electrode 30 is placed on the surface of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm; (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40 and obtain the composite unit; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0085] Comparative Example 2 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 40 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface of the protrusion 21 is provided with a silicone layer 212 with a thickness of 8 mm, and the surface roughness Ra of the silicone layer 212 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40 and obtain the composite unit; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0086] Comparative Example 3 (1) A first end cap 10 and a second end cap 20 are provided, wherein the first end cap 10 is provided with a recess 11, the recess 11 includes an arc-shaped concave surface 111 with an arc radius of 350 mm, and the surface roughness Ra of the recess 11 is 1.6 μm; the second end cap 20 is provided with a protrusion 21 that matches the recess 11, the protrusion 21 includes an arc-shaped convex surface 211, the arc radius of the arc-shaped convex surface 211 is the same as that of the arc-shaped concave surface 111 in the first end cap 10, and the surface of the protrusion 21 is provided with a silicone layer 212 with a thickness of 8 mm, and the surface roughness Ra of the silicone layer 212 is 1.6 μm; (2) The electrode 30 is placed in the recess 11 of the first end cap 10, wherein the side of the electrode 30 with the current collector 31 is disposed close to the first end cap 10, the thickness of the electrode 30 is 90 μm, and the thickness of the current collector 31 is 18 μm. (3) Place the diaphragm 40 on one side surface of the electrode 30 having the active layer 32; wherein the thickness of the diaphragm 40 is 15 μm; (4) Under the conditions of 80℃ and 0.4MPa, the second end cap 20 is hot-pressed with the electrode 30 and the diaphragm 40 for 3s to obtain a composite structure; (5) The composite structure is cut on one side by laser to cut the diaphragm 40 and obtain the composite unit; wherein the laser frequency is set to 50kHz and the pulse width is set to 0.5ms.
[0087] The flatness of the composite units obtained in Examples 1-6 and Comparative Examples 1-3 was tested, and the electrode condition was observed. The flatness test method was as follows: the composite unit was placed on a flat surface, and the distance between the highest point of the composite unit and the flat surface was measured. The results are shown in Table 1. Table 1
[0088] As can be seen from Table 1, compared to the planar composite device in Comparative Example 1, Embodiments 1-6 of this application, through the cooperation of a first end cap 10 with a recessed portion 11 and a second end cap 20 with a protruding portion 21, and by making the radius of the arc-shaped concave surface 111 in the recessed portion 11 50mm-300mm, can achieve a higher flatness of the resulting composite unit, a significantly reduced degree of bending, and no active layer detachment, thus ensuring the bonding performance between the electrode 30 and the diaphragm 40 and improving the quality of the composite unit. Compared to Comparative Examples 2-3, Embodiments 1-6 of this application, by controlling the degree of bending of the recessed portion 11 and the protruding portion 21, can avoid reverse bending during the composite process and ensure flatness. In Comparative Example 2, the composite unit exhibited reverse bending, leading to the detachment of part of the active layer.
[0089] In the description of this application, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0090] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0091] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.
[0092] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. A composite device for electrodes and diaphragms, characterized in that, An application to the composite of an electrode and a separator, wherein the electrode includes a current collector and an active layer coated on one side of the current collector, and the separator is disposed on one side of the active layer; The composite device includes: A first end cap, wherein a recessed portion is provided on the first end cap, the recessed portion including an arc-shaped concave surface; The second end cap is provided with a protrusion that matches the recessed portion, the protrusion including an arc-shaped convex surface; The radius of the arc-shaped concave surface is 50mm-300mm, the current collector side of the electrode is adapted to be disposed close to the first end cap, and the active layer side of the electrode is adapted to be disposed close to the second end cap.
2. The electrode and diaphragm composite device according to claim 1, characterized in that, The surface of the protrusion is provided with a silicone layer.
3. The electrode and diaphragm composite device according to claim 2, characterized in that, The thickness of the silicone layer is 6mm-10mm.
4. The electrode and diaphragm composite device according to any one of claims 1-3, characterized in that, The surface roughness Ra of the recessed portion is ≤1.6μm; And / or, the surface roughness Ra of the protrusion is ≤1.6μm.
5. A method for combining an electrode and a diaphragm, characterized in that, The electrode and diaphragm are composited using the electrode and diaphragm composite device as described in any one of claims 1-4, comprising: Provide a first and a second head; The electrode is placed in the recess of the first end cap, wherein the side of the electrode with the current collector is disposed close to the first end cap; The diaphragm is placed on the surface of the electrode sheet that has the active layer. The electrode and the diaphragm are hot-pressed using the second end cap to obtain a composite structure; The composite structure is cut to obtain composite units.
6. The electrode and diaphragm composite method according to claim 5, characterized in that, The hot pressing of the electrode and the diaphragm using the second end cap includes: Under conditions of 70℃-90℃ and 0.2MPa-0.6MPa, the second end cap is used to hot press the electrode and the diaphragm for 2s-4s.
7. The electrode and diaphragm composite method according to claim 5, characterized in that, The cutting of the composite structure includes: The composite structure is cut on one side using a laser to sever the diaphragm; wherein the laser frequency is 50kHz-70kHz and the pulse width is 0.4ms-0.6ms.
8. A composite unit, characterized in that, Including electrodes and diaphragms; The electrode includes a current collector and an active layer, and the separator includes a base film and an adhesive layer disposed on at least one side of the base film; The composite unit is formed by combining the electrode and diaphragm composite device as described in any one of claims 1-4, and / or by combining the composite method as described in any one of claims 5-7.
9. The composite unit according to claim 8, characterized in that, The thickness of the electrode is 60μm-120μm; And / or, the thickness of the current collector is 10μm-25μm; And / or, the thickness of the diaphragm is 10μm-20μm.
10. The composite unit according to claim 9, characterized in that, The diaphragm includes a base membrane and an adhesive layer disposed on at least one side of the base membrane.