CN218340801U - Current collector coarsening device and negative electrode composite system - Google Patents
Current collector coarsening device and negative electrode composite system Download PDFInfo
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- CN218340801U CN218340801U CN202222591923.1U CN202222591923U CN218340801U CN 218340801 U CN218340801 U CN 218340801U CN 202222591923 U CN202222591923 U CN 202222591923U CN 218340801 U CN218340801 U CN 218340801U
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Abstract
The utility model relates to a battery production field discloses a mass flow body alligatoring device and negative pole combined system. The utility model discloses a mass flow body alligatoring device, handle roller and dorsal bar including the indentation, roller and dorsal bar parallel arrangement are handled to the indentation, the indentation is handled the roller and is had the coarse roll surface that makes the mass flow body produce the indentation, the dorsal bar has the elasticity roll surface, have the alligatoring gap that supplies the mass flow body to pass through between indentation processing roller and the dorsal bar, the alligatoring gap is less than the thickness of mass flow body, indentation processing roller and dorsal bar are the same with the mass flow body direction of delivery in the operation in alligatoring gap, and the linear velocity of indentation processing roller and dorsal bar equals with mass flow body rate of delivery. According to the method, the surface roughness of the copper foil is improved by forming the indentation through the rolling of the rough roller; the method is simple and efficient to operate, does not consume copper foil, is easy to compound, reduces the compound pressure, reduces the thickness change of the lithium belt, and improves the bonding strength of the lithium-copper compound interface.
Description
Technical Field
The utility model belongs to the technical field of battery production and specifically relates to a mass flow body alligatoring device and negative pole combined system.
Background
The lithium ion power battery is widely applied to electric automobiles after ten years of vigorous development, but the energy density of a power battery monomer is still greatly influenced by 300 Wh/kg. The problem of spontaneous combustion of new energy automobiles is not rare during development, and the defects of a liquid lithium ion battery are exposed. In order to solve the above problems, solid-state lithium metal batteries have been widely studied and known as "holy cups" of lithium ion batteries.
In order to match the development of lithium metal solid-state batteries, many enterprises in the industry lay out and develop lithium metal cathodes. Since metallic lithium is soft, lithium tapes have very low tensile strength and therefore often require a carrier layer as support. The copper foil is used as the current collector of the negative electrode of the existing lithium ion battery, so the copper foil is used as the bearing layer to support the lithium belt and also used as the current collector. At present, the lithium copper composite belt is prepared by a plurality of methods, such as a high-temperature extrusion coating method, a scraper transfer coating method, a high-temperature casting method, a plasma deposition method and a mechanical composite method.
Application publication No. CN 109346680A a method for preparing an ultra-thin metallic lithium ribbon, in which a molten lithium extrusion speed is controlled by adjusting the viscosity of a molten lithium ingot by adding a conductive agent to the molten lithium ingot, is proposed, and a thickness of 10 to 100 μm can be obtained by coating the molten lithium on a copper foil. The patent publication No. CN 210394523U discloses a device for preparing a large-width ultrathin metal lithium belt, which is characterized in that lithium metal is melted in a hot box, and the lithium metal is transferred to a copper foil base material on a back roll after being attached with lithium liquid by rolling and controlled by a scraper to be intermittent. The thickness of the ultrathin lithium strip obtained by the method is 5-50 μm. Application publication No. CN 114147192A a method and device for preparing ultrathin lithium belt/foil by inclined self-casting, which provides that molten metal lithium is transferred onto a preheated copper foil base material which runs obliquely upwards, and the ultrathin lithium belt with the thickness of 5-100 mu m is obtained by utilizing gravity automatic casting.
Although the method is simple and efficient, the molten metal lithium is easy to oxidize and needs to be carried out under the protection of argon, so that the operation difficulty is high and the energy consumption is high. The target is more efficient and simple and is still mechanically compounded. The mechanical compounding mode is mainly concerned about the bonding strength of the lithium-copper compounding interface. Grant No. CN 111360073B a method for improving surface roughness of rolled copper foil suggests that surface roughness of copper foil will affect the bonding force of lithium-copper interface. According to the method, the surface roughness of the copper foil is increased through liquid nitrogen freezing and liquid carbon dioxide etching, so that the bonding strength of a lithium-copper interface is improved. However, the method consumes a large amount of liquid nitrogen and liquid carbon dioxide in continuous processing, and has potential safety hazards. In the application publication No. CN 113903876A lithium copper composite belt and the preparation method and equipment thereof, a copper foil is punctured through micro needles to form a punctured area, and residual spines or bulges after puncturing are embedded with a metal lithium belt during compounding so as to improve the bonding strength of a lithium copper interface, but micropores formed after puncturing through the micro needles in the method can cause the metal lithium on two sides of the copper foil to shuttle so as to influence consistency. The prior technical mode of the applicant is that a grinding wheel is utilized to grind a copper foil current collector to realize coarsening, and then the copper foil current collector is compounded with a lithium belt in the same system, but the mode can generate more dust in the grinding and coarsening process, and a dust removal device is required to be adopted for dust removal and treatment, so that the complexity of the structure is increased, and certain loss is brought to the current collector.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a mass flow body alligatoring device and negative pole combined system are provided, realize the alligatoring of mass flow body, and can not cause the loss of mass flow body.
The utility model discloses a mass flow body alligatoring device, handle roller and dorsal bar including the indentation, roller and dorsal bar parallel arrangement are handled to the indentation, the indentation is handled the roller and is had the coarse roll surface that makes the mass flow body produce the indentation, the dorsal bar has the elasticity roll surface, have the alligatoring gap that supplies the mass flow body to pass through between indentation processing roller and the dorsal bar, the alligatoring gap is less than the thickness of mass flow body, indentation processing roller and dorsal bar are the same with the mass flow body direction of delivery in the operation in alligatoring gap, and the linear velocity of indentation processing roller and dorsal bar equals with mass flow body rate of delivery.
Preferably, the rough roll surface granularity of the indentation treatment roll is 50-1000 meshes.
Preferably, the rough roll surface granularity of the indentation treatment roll is 150-500 meshes.
Preferably, the backing roller is a rubber roller.
The application also discloses adopt the negative pole alligatoring combined system of mass flow body alligatoring device, including mass flow body alligatoring circuit and at least one combined material transfer line, mass flow body alligatoring device sets up on the mass flow body alligatoring circuit, mass flow body alligatoring circuit and combined material transfer line assemble in the composite set.
Preferably, the composite material conveying line comprises an upper composite material conveying line and a lower composite material conveying line, and the upper composite material conveying line and the lower composite material conveying line are respectively converged on the upper side surface and the lower side surface of the current collector coarsening line.
Preferably, the upper composite material conveying line and the lower composite material conveying line respectively comprise a composite material unreeling device, a composite material tension control mechanism and a composite material deviation correcting device which are sequentially arranged.
Preferably, the current collector coarsening circuit comprises a current collector unreeling device, a current collector tension control mechanism and a current collector deviation correcting device which are sequentially arranged, and the current collector coarsening device is arranged at the downstream of the current collector deviation correcting device.
Preferably, a composite negative electrode tension control mechanism and a composite negative electrode winding device are sequentially arranged at the downstream of the composite device.
Preferably, the composite material conveying line is provided with a composite material unreeling device; the current collector coarsening circuit is provided with a current collector unreeling device, and the current collector coarsening device is arranged at the downstream of the current collector unreeling device; a composite cathode winding device is arranged at the downstream of the composite device;
and the composite material unwinding device, the current collector unwinding device and the composite negative electrode winding device are arranged below the current collector coarsening device and the composite device side by side.
The utility model has the advantages that: according to the method, the surface roughness of the copper foil is improved by forming the indentation through the rolling of the rough roller; the method is simple and efficient to operate, does not consume copper foil, is easy to compound, reduces the compound pressure, reduces the thickness change of the lithium belt, and improves the bonding strength of the lithium-copper compound interface.
Drawings
FIG. 1 is a schematic illustration of the present application;
reference numerals: the device comprises an upper composite material unwinding device 1, a current collector unwinding device 2, a lower composite material unwinding device 3, a composite negative electrode winding device 4, an upper composite material tension control mechanism 51, a current collector tension control mechanism 52, a lower composite material tension control mechanism 53, a composite negative electrode tension control mechanism 54, an upper composite material deviation correcting device 61, a current collector deviation correcting device 62, a lower composite material deviation correcting device 63, an indentation processing roller 7, a back roller 8, a first composite roller 91 and a second composite roller 92.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, the utility model discloses a current collector alligatoring device, handle roller 7 and backing roll 8 including the indentation, roller 7 and the 8 parallel arrangement of backing roll are handled to the indentation, indentation is handled roller 7 and is had the coarse roll surface that makes the mass flow body produce the indentation, backing roll 8 has the elasticity roll surface, the alligatoring gap that supplies the mass flow body to pass through has between indentation is handled roller 7 and the backing roll 8, the alligatoring gap is less than the thickness of the mass flow body, indentation is handled roller 7 and backing roll 8 and is the same with the mass flow body direction of delivery in the traffic direction in alligatoring gap, and the linear velocity of indentation is handled roller 7 and backing roll 8 and is equallyd with mass flow body speed of delivery.
In actual production, the current collector of the negative electrode usually adopts copper foil, and if necessary, other materials such as silver foil, etc., and the composite material usually adopts metallic lithium strip or lithium alloy strip, the lithium alloy strip includes lithium-based material and metallic elements doped with the lithium-based material, and the metallic elements include at least one of magnesium, boron, aluminum, calcium, silicon, indium, tin, zinc, silver, manganese, sodium, copper, etc. Although the roller is also adopted to coarsen the current collector, the coarsening principle is completely different from grinding. The application is the alligatoring that the cooperation of 8 backs of roller 7 and the back roll that has the elastic roll surface of indentation processing roller 7 that utilize to have a coarse roll surface was gone on, when the mass flow body reachs the alligatoring gap between indentation processing roller 7 and the back roll 8, because the alligatoring gap is less than the thickness of mass flow body, therefore the mass flow body can be extrudeed, the alligatoring mass flow body is extrudeed to the elastic roll surface to the coarse roll surface, can produce the alligatoring indentation on the mass flow body two sides simultaneously, and the traffic direction and the linear velocity of indentation processing roller 7 and back roll 8 all equal with the mass flow body, relative friction can not appear, therefore can not cause the loss of copper foil, can not produce the dust bits, need protect and collect. Although the indentation treatment roller 7 and the back roller 8 may be unpowered rollers, and the rotation is achieved by using the power transmitted by the current collector itself, it is preferable to use powered rollers, and specifically, reference may be made to the existing driving method of powered rollers, such as motor driving. The indentation processing roller 7 can adopt roller spacing adjusting mechanisms such as air cylinders and the like to realize the adjustment of the coarsening gap, and the specific structure of the roller spacing adjusting mechanism can refer to the roller spacing adjusting mechanism of the existing composite roller.
The creasing roller 7 needs to be rougher than the grinding wheel required for grinding to generate sufficient creasing, usually a grinding wheel is used, although other rollers with rough roller surface may be used, in the preferred embodiment of the application, the creasing roller 7 has a rough roller surface granularity of 50-1000 mesh, preferably 150-500 mesh.
The back roll 8 needs to have elasticity, and under the condition that the indentation appears in guaranteeing to support to reach, prevents that the whole quilt of mass flow body from being extruded and deformed, back roll 8 adopt the rubber roller can, also can adopt materials such as silica gel that have elasticity.
The current collector coarsening device can be used in a single current collector coarsening flow, and can also be combined with a negative electrode composite system to form the negative electrode coarsening composite system. During production, the current collector to be processed is conveyed through the current collector coarsening line, and the composite material is conveyed through the composite material conveying line. Before compounding, the current collector is firstly conveyed to a current collector coarsening device for coarsening, the coarsened current collector and the composite material are conveyed to a compounding device, the compounding device generally comprises a first compounding roller 91 and a second compounding roller 92, a compounding area for compounding the current collector and the composite material in a pressed mode is formed between the first compounding roller 91 and the second compounding roller 92, and the coarsened current collector and the composite material are compounded in the compounding area in a pressed mode. The first composite roll 91 and the second composite roll 92 are usually anti-sticking rolls made of polyoxymethylene, polyethylene, polytetrafluoroethylene, ceramic, or the like.
The current collector can be compounded on one surface only or on both surfaces, the latter is a better production mode generally, and the purpose of compounding the two surfaces is achieved. The upper composite material conveying line and the lower composite material conveying line are used for conveying the composite materials to the upper side face and the lower side face of the current collector respectively, and the two sides of the current collector are compounded in the compounding device.
The composite material conveying line can refer to the arrangement form of the existing lithium battery cathode composite system, and in the embodiment shown in the figure, the upper composite material conveying line and the lower composite material conveying line respectively comprise a composite material unreeling device, a composite material tension control mechanism and a composite material deviation correcting device which are sequentially arranged. The upper composite material conveying line sequentially comprises an upper composite material unreeling device 1, an upper composite material tension control mechanism 51 and an upper composite material deviation correcting device 61, and the lower composite material conveying line sequentially comprises a lower composite material unreeling device 3, a lower composite material tension control mechanism 53 and a lower composite material deviation correcting device 63. The composite material unwinding device is used for storing composite materials to be subjected to composite processing, the composite material tension control mechanism is used for controlling the tension on a composite material conveying line, and the composite material deviation rectifying device is used for preventing the composite materials from deviating in the conveying process. Similarly, the current collector coarsening circuit comprises a current collector unreeling device 2, a current collector tension control mechanism 52 and a current collector deviation correcting device 62 which are sequentially arranged, and the current collector coarsening device is arranged at the downstream of the current collector deviation correcting device 62. Further, a composite negative tension control mechanism 54 and a composite negative take-up device 4 are provided in this order downstream of the composite device. The composite processed cathode passes through the composite cathode tension control mechanism 54 and then is wound by the composite cathode winding device 4, so that the cathode is convenient to transport and store. Above-mentioned each unwinding device, tension control mechanism, deviation correcting device and coiling mechanism all have ripe equipment in prior art, and it is not repeated here.
Each device in the negative electrode coarsening composite system can be arranged according to the conventional mode, however, considering that each unwinding device and winding device are convenient for taking and placing materials, in the preferred embodiment of the application, the composite material unwinding device, the current collector unwinding device 2 and the composite negative electrode winding device 4 are all arranged below the current collector coarsening device and the composite device side by side. The unwinding device and the winding device are placed below, so that an operator can take down the composite processed material and put the upper belt processed material.
The following examples will illustrate a composite lithium tape with copper foil as a current collector.
The width of the lithium strip is 50-400mm, preferably 80-150mm. The thickness of the lithium ribbon is 5-200 μm, preferably 20-120 μm. The strength delta of the lithium belt is greater than 0.8Mpa. The lithium belt can be selectively covered with a bearing film, and the bearing film is one of high polymer polymers such as PP, PE, PET and the like. The bearing film is arranged on one side, far away from the copper foil, of the lithium belt. The width of the copper foil is 50-600mm, preferably 80-200mm. The copper foil has a thickness of 2 to 17 μm, preferably 6 to 12 μm. The copper foil is a smooth copper foil, and the roughness Rz of the smooth surface of the copper foil is less than 2 mu m. The width of the indentation treatment roller 7 is replaceable, the width is in the range of 50-400mm, preferably 80-150mm, and the width of the indentation treatment roller 7 is larger than that of the attached lithium strip. The pressure between the indentation treatment roller 7 and the rubber backing roller 88 is 0 to 2000N, preferably 200 to 1000N. The compounding pressure between the compounding rollers 91 and 92 is 0 to 6000N, preferably 2000 to 6000N.
When the negative electrode coarsening composite system is adopted for processing, the double-sided smooth copper foil is unreeled by the current collector unreeling device 2, an indentation is formed by the current collector coarsening device after tension control and deviation correction, two rolls of lithium belts are unreeled from the upper composite material unreeling device 1 and the lower composite material unreeling device 3 respectively, and are coiled by the composite negative electrode coiling device 4 through the composite devices respectively on the upper surface and the lower surface of the copper foil after tension control and deviation correction, and if the self-supporting lithium belts are selected, the tensile strength of the self-supporting lithium belts is lower than that of the self-supporting lithium belts when the tension is adjusted so as to prevent belt breakage. The width of the lithium strip cannot exceed the width of the copper foil during compounding, and the relative positions of the lithium strip and the copper foil are adjustable, usually the lithium strip is aligned in the middle, and the lithium strip can be left with different margins on two sides. The lithium-copper composite interface strength can be improved until the lithium-copper composite interface strength cannot be peeled off by gradually increasing the pressure between the first composite roller 91 and the second composite roller 92, and finally the lithium-copper composite interface strength is wound by the composite cathode winding device 4. After the copper foil is rolled by a rough roller to form an indentation, the roughness Rz of two surfaces of the copper foil is more than or equal to 2 mu m, and preferably 2.0-3.5 mu m. The lithium strip is compounded on at least one surface of the copper foil, and the peel strength of the lithium-copper composite strip is larger than 10N/m, so that the lithium-copper composite strip cannot be peeled better.
The following are examples and comparative examples of the present application.
In the first embodiment, a copper foil 200mm wide and 8 μm thick is unreeled by a current collector unreeling device 2 at a speed of 2m/min, and is rolled by a 100-mesh indentation processing roller 7 to form indentations, and simultaneously, a lithium strip 100mm wide and 50 μm thick is unreeled from an upper composite unreeling device 1 and a lower composite unreeling device 3 at a speed of 2m/min, and is centrally aligned with the copper foil after deviation rectification adjustment. And respectively compounded on the upper surface and the lower surface of the copper foil under the compounding pressure of 5000N. The roughness Rz of the polished copper foil is more than 5.0 μm. The lithium-copper composite plate has good bonding force and cannot be peeled.
In the second embodiment, a copper foil 200mm wide and 8 μm thick is unreeled by a current collector unreeling device 2 at a speed of 2m/min, and is rolled by a 220-mesh indentation treatment roller 7 to form indentations, and simultaneously, a lithium strip 100mm wide and 50 μm thick is unreeled from an upper composite unreeling device 1 and a lower composite unreeling device 3 at a speed of 2m/min, and is centrally aligned with the copper foil after deviation rectification adjustment. And respectively compounding the copper foil on the upper surface and the lower surface of the copper foil under the compounding pressure of 5000N. After polishing, the roughness Rz of the copper foil is more than 3.0 mu m, the binding force of the lithium-copper composite plate surface is good, and the lithium-copper composite plate surface cannot be peeled off.
Comparative example I, a copper foil 200mm wide and 8 μm thick was unwound from a current collector unwinding device 2 at a speed of 2m/min without roll pressing to make an impression. The lithium strips with the width of 100mm and the thickness of 50 mu m are respectively unreeled from the upper composite material unreeling device 1 and the lower composite material unreeling device 3 at the speed of 2m/min and are aligned with the copper foil in the middle after error correction adjustment. And respectively compounded on the upper surface and the lower surface of the copper foil under the compounding pressure of 5000N. The roughness Rz of the untreated copper foil is < 2 μm. The lithium copper composite plate is poor, and particularly, the edges are not fully combined with the copper foil.
Claims (10)
1. Current collector alligatoring device, its characterized in that, handle roller (7) and dorsal roll (8) including the indentation, indentation is handled roller (7) and dorsal roll (8) parallel arrangement, indentation is handled roller (7) and is had the coarse roll surface that makes the mass flow body produce the indentation, dorsal roll (8) have the elasticity roll surface, have the alligatoring gap that supplies the mass flow body to pass through between indentation is handled roller (7) and dorsal roll (8), the alligatoring gap is less than the thickness of the mass flow body, indentation is handled roller (7) and dorsal roll (8) and is the same with the mass flow body direction of delivery in the traffic direction in alligatoring gap, and the linear velocity of indentation is handled roller (7) and dorsal roll (8) equals with mass flow body speed of delivery.
2. The current collector roughening apparatus as recited in claim 1, wherein: the rough roll surface granularity of the indentation treatment roll (7) is 50-1000 meshes.
3. The current collector roughening apparatus as recited in claim 2, wherein: the rough roll surface granularity of the indentation treatment roll (7) is 150-500 meshes.
4. The current collector roughening apparatus as recited in claim 1, wherein: the back roll (8) is a rubber roll.
5. A negative electrode roughening composite system using the current collector roughening apparatus according to any one of claims 1 to 4, wherein: including the mass flow body alligatoring line and at least one combined material transfer line, the mass flow body alligatoring device sets up on the mass flow body alligatoring line, mass flow body alligatoring line and combined material transfer line assemble in the composite set.
6. The negative roughening composite system according to claim 5, wherein: the composite material conveying line comprises an upper composite material conveying line and a lower composite material conveying line, wherein the upper composite material conveying line and the lower composite material conveying line are respectively gathered on the upper side surface and the lower side surface of the current collector coarsening line.
7. The negative roughening composite system according to claim 6, wherein: the upper composite material conveying line and the lower composite material conveying line respectively comprise a composite material unreeling device, a composite material tension control mechanism and a composite material deviation correcting device which are sequentially arranged.
8. The negative roughening composite system according to claim 5, wherein: the current collector coarsening circuit comprises a current collector unreeling device (2), a current collector tension control mechanism (52) and a current collector deviation correcting device (62), which are sequentially arranged, and the current collector coarsening device is arranged at the downstream of the current collector deviation correcting device (62).
9. The negative roughening composite system according to claim 5, wherein: and a composite cathode tension control mechanism (54) and a composite cathode winding device (4) are sequentially arranged at the downstream of the composite device.
10. The negative roughening composite system according to claim 5, wherein: the composite material conveying line is provided with a composite material unreeling device; the current collector coarsening circuit is provided with a current collector unreeling device (2), and the current collector coarsening device is arranged at the downstream of the current collector unreeling device (2); a composite cathode winding device (4) is arranged at the downstream of the composite device;
and the composite material unwinding device, the current collector unwinding device (2) and the composite negative electrode winding device (4) are arranged below the current collector coarsening device and the composite device side by side.
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| CN202222591923.1U CN218340801U (en) | 2022-09-29 | 2022-09-29 | Current collector coarsening device and negative electrode composite system |
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| CN202222591923.1U CN218340801U (en) | 2022-09-29 | 2022-09-29 | Current collector coarsening device and negative electrode composite system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115939328A (en) * | 2023-03-09 | 2023-04-07 | 广东捷盟智能装备有限公司 | Covering device for copper-lithium composite belt |
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2022
- 2022-09-29 CN CN202222591923.1U patent/CN218340801U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115939328A (en) * | 2023-03-09 | 2023-04-07 | 广东捷盟智能装备有限公司 | Covering device for copper-lithium composite belt |
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