CN217839107U - Copper plating equipment of negative electrode roll, negative plate and lithium ion battery - Google Patents
Copper plating equipment of negative electrode roll, negative plate and lithium ion battery Download PDFInfo
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- CN217839107U CN217839107U CN202222328473.7U CN202222328473U CN217839107U CN 217839107 U CN217839107 U CN 217839107U CN 202222328473 U CN202222328473 U CN 202222328473U CN 217839107 U CN217839107 U CN 217839107U
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model discloses a copper facing equipment, negative pole piece and lithium ion battery that negative pole was rolled up, the copper facing equipment that the negative pole was rolled up includes: a vacuum chamber, wherein a vacuum cavity is formed inside the vacuum chamber; the vacuumizing component is communicated with the vacuum chamber so as to vacuumize the vacuum chamber; the negative electrode roll conveying device is used for conveying a negative electrode roll; the evaporation source is positioned on at least one side of the conveying direction of the negative electrode roll conveying device, and a copper evaporant is arranged in the evaporation source and used for evaporating the copper evaporant to the negative electrode roll. Therefore, the utility model discloses a copper-plating equipment that negative pole was rolled up can realize that the negative pole rolls up surface copper-plating, and is efficient, fast, with low costs, can realize continuous production simultaneously.
Description
Technical Field
The utility model relates to a technical field, concretely relates to copper facing equipment, negative pole piece and lithium ion battery of negative pole book are made to negative pole piece.
Background
The lithium ion battery is taken as the most core component of the current new energy automobile, the performance of the lithium ion battery is directly related to the experience of consumers such as the endurance mileage and the charging time of the new energy automobile, the improvement of the energy density is relatively limited on the premise of the existing material system, and the reduction of the charging time (quick charging) is the breakthrough point of the differentiation of the battery performance in two years.
It is well known that the charging process of lithium ion power batteries is Li + And the lithium ions are extracted from the positive electrode and diffused to the negative electrode through the electrolyte, and the whole lithium ion transmission process comprises the following steps: (1) li + Diffusion in the positive electrode material; (2) li + Stripping from the anode material; (3) li + Transferring in an electrolyte; (4) li + Through the negative electrode surface SEI film; (5) li + Diffusion in the anode material. Per process Li + The diffusion rate of (2) can affect the quick charging performance of the lithium ion battery, but the Li of the negative electrode graphite + The diffusion coefficient is relatively low, and the safety problems of battery heating and lithium precipitation and the like are brought, so that the improvement of the ion conduction capability of the negative electrode is the key for solving the quick charging performance of the battery.
In addition to the above-mentioned graphite cathode problem, silicon-based materials (SiO, siC) are generally accepted as high energy density cathode materials in recent years, because the electron conductivity is close to that of semiconductors, and is worse than that of graphite (carbon-based materials), and at present, silicon cathodes can only be mixed with cathodes for application, so the demand of silicon cathodes for improving the conductivity is more urgent.
At present, in order to solve the problem of negative electrode ion conduction capacity, the surfaces of graphite and silicon-based negative electrode materials need to be modified, including surface oxidation treatment, surface carbon coating, surface metallization and the like. Wherein, the graphite after metallization, li + The diffusion coefficient is improved most obviously, the researched metals mainly comprise nickel, silver, copper and the like, the advantages are that after the graphite powder is plated with copper, the material resistance and the SEI film resistance are obviously reduced,in addition, copper has a catalytic effect on the oxidation of graphite, so that the graphite structure is more stable, the change of the graphite volume of the electrode in the charging and discharging process is improved, the electrode expansion is reduced, and the thermal stability, the cyclicity and the high-rate charging performance of the electrode are improved.
Although graphite copper plating has a good improvement on the quick charging performance of the battery, the current graphite copper plating realization technology is to carry out chemical plating on graphite powder, and the process is complex, low in efficiency and high in cost, so that the graphite copper plating cannot be truly commercialized.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a copper-plating equipment of negative pole book, this copper-plating equipment of negative pole book can realize the surface copper-plating of negative pole book through vacuum evaporation's mode, and is efficient, fast, with low costs, can realize continuous production simultaneously.
The utility model also aims to provide a negative plate to use the copper plating equipment of foretell negative pole book.
The utility model discloses still aim at providing a lithium ion battery to use foretell negative pole piece.
In one aspect of the present invention, the utility model provides a copper plating equipment of negative pole book.
According to the utility model discloses a copper facing equipment of this negative pole book includes: a vacuum chamber having a vacuum chamber formed therein; the vacuumizing component is communicated with the vacuum chamber so as to vacuumize the vacuum chamber; the negative electrode roll conveying device is used for conveying a negative electrode roll; the evaporation source is positioned on at least one side of the conveying direction of the negative electrode roll conveying device, and copper evaporants are arranged in the evaporation source and used for evaporating the copper evaporants to the negative electrode roll.
According to the utility model discloses copper facing equipment that negative pole was rolled up, through the vacuum chamber that forms in the real empty room of evacuation part intercommunication to carry out the evacuation to the vacuum chamber, conveyor is rolled up the negative pole to evaporation source department to the negative pole, the copper evaporant in the evaporation source can be rolled up the negative pole through evaporation source evaporation, the evaporation source is located the negative pole and rolls up at least one side of direction of delivery, thereby can realize the surface copper facing that the negative pole was rolled up through vacuum evaporation's mode, and is efficient, fast, and is with low costs, can realize continuous production simultaneously.
In addition, according to the utility model discloses copper equipment of copper facing of negative pole book of above-mentioned embodiment can also have following additional technical characterstic:
in some embodiments of the present invention, the evaporation source is disposed on the upper and lower sides of the conveying direction of the negative electrode roll conveying device, so as to perform evaporation on two sides of the negative electrode roll.
In some embodiments of the present invention, the negative electrode roll conveying device includes: a first reel; and one end of the negative electrode roll is wound on the second winding drum, the other end of the negative electrode roll is wound on the first winding drum, and the evaporation source is positioned between the first winding drum and the second winding drum.
In some embodiments of the present invention, the negative electrode roll conveying device further includes: the first pressing roller is arranged close to the first reel and used for stopping against the negative roll; and the second compression roller is arranged close to the second winding drum and used for stopping abutting against the negative roll, and the evaporation source is positioned between the first compression roller and the second compression roller.
In a second aspect of the present invention, the present invention provides a negative electrode sheet. According to the embodiment of the utility model, this negative pole piece adopts the copper facing equipment preparation of foretell negative pole book to obtain.
In addition, the negative electrode sheet according to the above embodiments of the present invention may further have the following additional technical features:
in some embodiments of the present invention, the negative electrode sheet includes: a negative current collector; a negative electrode active material layer coated on opposite sides of the negative electrode current collector; and a copper plating layer provided on each of the negative electrode active material layers.
In the utility modelIn some novel embodiments, the ratio of the area of the copper plating layer to the area of the negative electrode active material layer is 0.5 to 5%, or 0.1 to 5g/m 2 。
In some embodiments of the present invention, the thickness of the copper plating layer is 0.3 to 0.6nm.
In some embodiments of the present invention, the negative electrode active material layer includes a silicon material or graphite.
In a third aspect of the present invention, the present invention provides a lithium ion battery. According to the embodiment of the present invention, the lithium ion battery comprises the above negative electrode sheet.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a copper plating apparatus for a negative roll according to an embodiment of the present invention;
fig. 2 is a schematic view of a negative electrode sheet according to an embodiment of the present invention.
Reference numerals:
100. copper plating equipment of the negative electrode roll;
10. a vacuum chamber; 20. a vacuum-pumping component; 301. a first reel; 302. a second reel; 303. a first press roll;
304. a second press roll; 40. an evaporation source; 41. copper evaporant; 50. negative pole roll;
200. a negative plate;
210. a negative current collector; 220. a negative electrode active material layer; 230. and plating a copper layer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
In one aspect of the present invention, the utility model provides a copper plating equipment 100 of 50 is rolled up to negative pole.
As shown in fig. 1, the copper plating apparatus 100 for a negative roll 50 according to an embodiment of the present invention includes: a vacuum chamber 10, a vacuum pumping part 20, a negative electrode roll 50 conveying device and an evaporation source 40.
A vacuum chamber 101 is formed inside the vacuum chamber 10; the vacuumizing part 20 is communicated with the vacuum chamber 10 to vacuumize the vacuum chamber 101; the negative electrode roll 50 conveying device is used for conveying the negative electrode roll 50; the evaporation source 40 is located at least on one side of the conveying direction of the negative electrode roll 50 conveying device, and a copper evaporant 41 is arranged in the evaporation source 40 and used for evaporating the copper evaporant 41 on the negative electrode roll 50.
It is to be understood that the vacuum chamber in the vacuum chamber 10 is evacuated by the evacuation unit 20, and the specific type of the evacuation unit 20 is not particularly limited, and may be, for example, a vacuum pump. The negative electrode roll 50 is positioned in the vacuum cavity and is conveyed to the evaporation source 40 by the negative electrode roll 50 conveying device, the electron beam of the evaporation source 40 obtains energy under the acceleration of an electric field, the energy of the electron beam on the copper material is converted into heat energy, the copper material is heated and gasified, copper atoms or molecules escape from the surface of the evaporation source 40 to form copper steam, the copper steam is evaporated on the surface of the negative electrode roll 50 to form a copper film after condensation, and therefore the surface copper plating of the negative electrode roll 50 can be realized in a vacuum evaporation mode, the efficiency is high, the speed is high, the cost is low, and meanwhile, the continuous production can be realized.
The evaporation source 40 may be provided on one side in the transport direction (the direction of the arrow in fig. 1) of the negative electrode roll 50 transport device, or may be provided on both opposite sides. When the negative electrode roll 50 is provided on one side, vapor deposition is performed on one surface, and when the negative electrode roll is provided on the opposite side, vapor deposition can be performed on both surfaces of the negative electrode roll 50 at the same time, thereby further improving vapor deposition efficiency.
According to the utility model discloses copper facing equipment 100 of 50 is rolled up to the negative pole, through the vacuum cavity that forms in communicating the vacuum chamber 10 with evacuation part 20, in order to carry out the evacuation to the vacuum cavity, 50 conveyor are rolled up to the negative pole is rolled up 50 and is carried to evaporation source 40 department to the negative pole, copper evaporant 41 in the evaporation source 40 can be through evaporation source 40 evaporation coating 50 on the negative pole is rolled up, evaporation source 40 is located 50 direction of delivery's of negative pole book at least one side, thereby can realize through vacuum evaporation coating's mode that the surface copper facing of 50 is rolled up to the negative pole, and is efficient, and is fast, and is with low costs, can realize continuous production simultaneously, just the utility model discloses a copper facing's technology is compared in chemical process to this kind of physics, and easy operation and stability.
In some embodiments, the evaporation sources 40 are disposed at the upper and lower sides of the transportation direction of the transportation device of the negative electrode roll 50 to perform evaporation on both sides of the negative electrode roll 50, so that both sides of the negative electrode roll 50 have the copper plating layer 230.
In some embodiments, as shown in fig. 1, the negative roll 50 transportation device includes a first roll 301 and a second roll 302, one end of the negative roll 50 is wound on the second roll 302, the other end is wound on the first roll 301, and the evaporation source 40 is located between the first roll 301 and the second roll 302. Specifically, the first reel 301 winds the negative electrode roll 50 before being plated with copper, the negative electrode roll 50 is subjected to evaporation copper plating through the evaporation source 40, and finally the negative electrode roll 50 formed with the copper plating layer 230 is conveyed to the second reel 302 to be collected.
In some embodiments, as shown in fig. 1, the negative electrode roll 50 conveying device further includes a first pressing roller 303 and a second pressing roller 304, the first pressing roller 303 is disposed near the first winding drum 301, and is used for stopping against the negative electrode roll 50; a second pressing roller 304 is disposed near the second reel 302 for stopping against the negative roll 50, and the evaporation source 40 is located between the first pressing roller 303 and the second pressing roller 304. Specifically, the negative electrode roll 50 is conveyed from the first reel 301 to the first pressing roller 303 by the negative electrode roll 50 conveying device, the first pressing roller 303 is used for guiding the negative electrode roll 50 to the evaporation source 40 for evaporation, and then the negative electrode roll 50 is guided to the second reel 302 for winding by the second pressing roller 304.
In a second aspect of the present invention, the present invention provides a negative plate 200.
As shown in fig. 2, according to the negative electrode sheet 200 of the embodiment of the present invention, the negative electrode sheet 200 is prepared by using the copper plating apparatus 100 of the negative electrode roll 50.
According to the utility model discloses negative pole piece 200, with the negative pole book 50 carry out vacuum deposition's mode copper facing through copper plating equipment 100, obtain surface copper-plated negative pole book 50, then roll up 50 with the negative pole and cut and obtain negative pole piece 200. Therefore, the ion conductivity of the negative plate 200 is improved, the charging capability is improved, and the problems of large temperature rise and lithium precipitation caused by insufficient charging capability of the negative electrode under the condition of large current of the battery core are solved.
In some embodiments, as shown in fig. 2, the negative electrode sheet 200 includes a negative electrode collector 210, a negative electrode active material layer 220, and a copper plated layer 230, the negative electrode active material layer 220 being coated on opposite sides of the negative electrode collector 210; a copper plated layer 230 is provided on each negative electrode active material layer 220. Specifically, first, an anode active material and a binder are mixed, and then coated on opposite sides of an anode current collector 210 to form an anode active material layer 220, and then a copper material is respectively evaporated on the anode active material layer 220 using the copper plating apparatus 100 of the above-described anode roll 50 to form a copper plated layer 230. It should be noted that the negative electrode current collector 210 may be a commonly used copper foil, and the copper material in the copper plated layer 230 is not particularly limited, and for example, the copper material is metallic copper. The specific type of the binder is also not particularly limited, and polyvinylidene fluoride and styrene butadiene rubber are selected, for example.
In some embodiments, the ratio of the area of the copper layer 230 on the negative electrode sheet 200 to the area of the negative electrode active material layer 220 is 0.5 to up to one5%, or 0.1-5 g/m 2 . The area of the copper plating layer 230 is controlled to be 0.5 to 5%, or 0.1 to 5g/m 2 In the range, for example, the area ratio of the copper plating layer 230 may be 0.5%, 2%, 5%, or 0.1g/m 2 、3g/m 2 、5g/m 2 And any value of (b) so that the conductivity of electrons is improved without hindering the migration of lithium ions.
In some embodiments, the thickness of the copper plating layer 230 is 0.3 to 0.6nm. That is, in the vacuum evaporation process, the thickness of the plated copper plating layer 230 is controlled so that the conductivity of electrons and the migration of lithium ions are well balanced.
In some embodiments, the negative active material layer 220 includes a silicon material or graphite. Specifically, the negative electrode active material layer 220 is composed of a negative electrode active material and a binder, and the negative electrode active material may be a silicon material or graphite. It should be noted that the specific type of the adhesive is the same as that described above, and is not described herein again.
In a third aspect of the present invention, the present invention provides a lithium ion battery. According to an embodiment of the present invention, the lithium ion battery includes the above negative electrode sheet 200. Therefore, the stability, the cycle performance, the high-rate charging performance and the like of the lithium ion battery are improved.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Examples
Referring to fig. 1, a specific embodiment of the copper plating apparatus 100 of the negative roll 50 of the present invention is described.
The copper plating apparatus 100 of the negative electrode roll 50 includes: the evaporation device comprises a vacuum chamber 10, a vacuum pumping part 20, a first reel 301, a second reel 302, a first compression roller 303, a second compression roller 304 and an evaporation source 40.
The vacuum chamber 10 is internally formed with a vacuum chamber 101.
The vacuum pumping means 20 is a vacuum pump and communicates with the vacuum chamber 10 to pump a vacuum in the vacuum chamber 101.
The negative pole roll 50 conveying device is used for conveying the negative pole roll 50, and the negative pole roll 50 conveying device comprises: a first reel 301, a second reel 302, a first pressure roller 303 and a second pressure roller 304.
One end of the negative electrode sheet 200 is wound on the second winding drum 302, the other end is wound on the first winding drum 301, and the evaporation source 40 is located between the first winding drum 301 and the second winding drum 302. The first pressing roller 303 is arranged close to the first winding drum 301 and used for stopping against the negative plate 200; the second pressing roller 304 is disposed near the second winding drum 302 for stopping on the negative electrode sheet 200, and the evaporation source 40 is located between the first pressing roller 303 and the second pressing roller 304.
The evaporation source 40 is located at the lower side of the conveying direction of the negative electrode roll 50 conveying device, and a copper evaporant 41 is arranged in the evaporation source 40 and used for evaporating the copper evaporant 41 on the negative electrode roll 50.
Preparation of negative electrode roll 50 including copper plating layer 230: the vacuum pump is used to evacuate the air in the vacuum chamber 10, and the negative electrode roll 50 without copper plating is wound on the first bobbin 301, and then the negative electrode roll 50 is transported to the evaporation source 40 to evaporate copper plating on both sides thereof. The negative electrode roll 50 after copper plating was cut, and the negative electrode sheet 200 obtained was such that the ratio of the area of the deposited copper plating layer 230 to the area of the negative electrode active material layer 220 was 3.5%, and the thickness of the copper plating layer 230 was 0.5nm.
Preparing a lithium battery: the negative electrode sheet 200, the positive electrode and the separator, both sides of which are plated with the copper plating layer 230, are assembled into a lithium battery.
Comparative example
The negative electrode sheet in this comparative example was the negative electrode sheet in the example that was not plated with copper. The preparation method of the lithium battery is the same as the embodiment.
The negative electrode sheets and lithium ion batteries obtained in the examples and comparative examples were tested, and the results are shown in table 1.
Table 1 results of performance tests of negative electrode sheets and lithium ion batteries obtained in comparative examples and examples
As can be seen from the data results in table 1, the resistivity and the expansion rate of the negative electrode sheet in the example are reduced compared with those in the comparative example, and the expansion rate of the lithium ion battery in the example is reduced, the cycle life is increased, the charging temperature rise and the charging DCIR are reduced compared with those in the comparative example, so that the copper plating device of the negative electrode roll in the application can realize copper plating on the surface of the negative electrode roll, and the copper plating effect is good.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A copper plating apparatus for a negative roll, comprising:
a vacuum chamber having a vacuum chamber formed therein;
the vacuumizing component is communicated with the vacuum chamber so as to vacuumize the vacuum chamber;
the negative electrode roll conveying device is used for conveying a negative electrode roll;
the evaporation source is positioned on at least one side of the conveying direction of the negative electrode roll conveying device, and copper evaporants are arranged in the evaporation source and used for evaporating the copper evaporants to the negative electrode roll.
2. The apparatus for copper plating of a negative electrode roll according to claim 1, wherein the evaporation sources are provided at upper and lower sides in a transport direction of the negative electrode roll transport device to perform evaporation on both sides of the negative electrode roll.
3. The apparatus for copper plating of negative electrode rolls as recited in claim 1, wherein said negative electrode roll conveying means comprises:
a first reel;
and one end of the negative electrode roll is wound on the second winding drum, the other end of the negative electrode roll is wound on the first winding drum, and the evaporation source is positioned between the first winding drum and the second winding drum.
4. The apparatus for copper plating of a negative roll as recited in claim 3, further comprising:
the first pressing roller is arranged close to the first reel and used for stopping against the negative roll;
and the second compression roller is arranged close to the second winding drum and used for stopping abutting against the negative electrode roll, and the evaporation source is positioned between the first compression roller and the second compression roller.
5. A negative electrode sheet, characterized in that the negative electrode sheet is prepared by cutting a negative electrode roll, and the negative electrode roll is prepared by using the copper plating equipment of the negative electrode roll according to any one of claims 1 to 4.
6. Negative electrode sheet according to claim 5, characterized in that it comprises:
a negative current collector;
a negative electrode active material layer coated on opposite sides of the negative electrode current collector;
and a copper plating layer provided on each of the negative electrode active material layers.
7. The negative electrode sheet according to claim 6, wherein the ratio of the area of the copper plating layer to the area of the negative electrode active material layer is 0.5 to 5%, or 0.1 to 5g/m 2 。
8. The negative electrode sheet according to claim 6, wherein the thickness of the copper plating layer is 0.3 to 0.6nm.
9. The negative electrode sheet according to claim 6, wherein the negative electrode active material layer comprises a silicon material or graphite.
10. A lithium ion battery comprising the negative electrode sheet according to any one of claims 5 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222328473.7U CN217839107U (en) | 2022-08-31 | 2022-08-31 | Copper plating equipment of negative electrode roll, negative plate and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222328473.7U CN217839107U (en) | 2022-08-31 | 2022-08-31 | Copper plating equipment of negative electrode roll, negative plate and lithium ion battery |
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| CN217839107U true CN217839107U (en) | 2022-11-18 |
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| CN202222328473.7U Active CN217839107U (en) | 2022-08-31 | 2022-08-31 | Copper plating equipment of negative electrode roll, negative plate and lithium ion battery |
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- 2022-08-31 CN CN202222328473.7U patent/CN217839107U/en active Active
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