CN211088393U - Positive plate, laminated battery and positive plate coating device - Google Patents
Positive plate, laminated battery and positive plate coating device Download PDFInfo
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- CN211088393U CN211088393U CN202020069409.XU CN202020069409U CN211088393U CN 211088393 U CN211088393 U CN 211088393U CN 202020069409 U CN202020069409 U CN 202020069409U CN 211088393 U CN211088393 U CN 211088393U
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The utility model relates to a battery manufacturing technology field provides a positive plate, lamination battery and positive plate coating device, and above-mentioned positive plate is including solid state electrolyte layer, anodal thick liquids layer and the aluminium foil layer that stacks gradually, solid state electrolyte layer with anodal thick liquids layer interfusion forms and mixes the layer, and above-mentioned positive plate is through scribbling anodal thick liquids layer on the aluminium foil layer earlier, scribbles solid state electrolyte layer on anodal thick liquids layer again, makes solid state electrolyte layer and anodal thick liquids layer interfusion and form and mix the layer, effectively improves the degree of bonding of solid state electrolyte layer and anodal thick liquids layer, reduces the interfacial impedance between solid state electrolyte layer and the anodal thick liquids layer, guarantees that the lamination battery has better performance.
Description
Technical Field
The utility model relates to a battery manufacturing technology field especially provides a positive plate, lamination battery and positive plate coating unit.
Background
With the continuous expansion of the battery application field, after the size of the lithium ion battery in the traditional structure is enlarged, some adverse reactions caused by a specific structure in the lithium ion battery are enlarged, so that a more optimized battery cell structure is urgently needed to meet the design requirements of a large-capacity square battery, and on the basis, the laminated battery is produced.
However, the conventional laminated battery has a problem of large interfacial resistance between the electrode material and the solid electrolyte, which adversely affects cycle characteristics, rate performance, and the like of the laminated battery.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a positive plate, lamination battery and positive plate coating device, the technical problem that interface impedance is big between the electrode material of the current lamination battery and the solid-state electrolyte is solved.
In order to achieve the above object, the utility model adopts the following technical scheme: the positive plate comprises a solid electrolyte layer, a positive slurry layer and an aluminum foil layer which are sequentially stacked, wherein the solid electrolyte layer and the positive slurry layer are blended to form a mixed layer.
The utility model provides a positive plate has following beneficial effect at least: the positive slurry layer is coated on the aluminum foil layer, and then the solid electrolyte layer is coated on the positive slurry layer, so that the solid electrolyte layer and the positive slurry layer are mixed and melted to form a mixed layer, the bonding degree of the solid electrolyte layer and the positive slurry layer is effectively improved, the interface impedance between the solid electrolyte layer and the positive slurry layer is reduced, and the laminated battery is ensured to have better performance.
In one embodiment, the solidified thickness of the solid electrolyte layer is 10 μm to 30 μm.
In one embodiment, the cured thickness of the positive slurry layer is 100 μm to 150 μm.
In one embodiment, the thickness of the aluminum foil layer is 12 μm to 15 μm.
In order to achieve the above object, the utility model also provides a laminated battery, including positive plate and negative plate, the negative plate includes copper foil layer and lithium foil layer, the copper foil layer the lithium foil layer the solid state electrolyte layer of positive plate the anodal thick liquids layer of positive plate reaches the aluminium foil layer of positive plate stacks gradually.
Since the laminated battery adopts all the embodiments of the positive electrode plate, at least all the advantages of the embodiments are achieved, and further description is omitted.
In one embodiment, the thickness of the copper foil layer is 6 μm to 10 μm.
In one embodiment, the thickness of the lithium foil layer is 20 μm to 80 μm.
In order to realize the above object, the utility model provides a positive plate coating device still, including transport mechanism and the first coating die head, second coating die head and the oven that set gradually, transport mechanism conveys the aluminium foil layer, so that the aluminium foil layer passes through in proper order first coating die head second coating die head with the oven, first coating die head is used for coating anodal thick liquids layer on the aluminium foil layer, second coating die head is used for coating solid electrolyte layer on the anodal thick liquids layer.
The utility model provides a positive plate coating device has following beneficial effect at least: the aluminum foil layer is continuously conveyed through the conveying mechanism, meanwhile, the anode slurry layer is coated on the aluminum foil layer through the first coating die head, the solid electrolyte layer is coated on the anode slurry layer through the second coating die head, the solid electrolyte layer and the anode slurry layer are mixed to form a mixed layer, then the solid electrolyte layer, the anode slurry layer and the aluminum foil layer which are sequentially stacked are conveyed into the oven through the conveying mechanism, the solid electrolyte layer and the anode slurry layer are heated and solidified, and the anode plate is manufactured.
In one embodiment, the conveying mechanism comprises an unreeling assembly, a reeling assembly and a plurality of conveying rollers arranged between the unreeling assembly and the reeling assembly.
By adopting the technical scheme, the aluminum foil layer can be guaranteed to be conveyed at a constant speed, so that the anode slurry layer and the solid electrolyte layer are uniformly coated, the qualification rate of the prepared anode plate is improved, and the performance of the laminated battery is guaranteed more effectively.
In one embodiment, the conveying mechanism further comprises a first coating roller and a second coating roller which are both arranged between the unreeling component and the reeling component, the first coating roller corresponds to the first coating die head, and the second coating roller corresponds to the second coating die head.
Through adopting above-mentioned technical scheme, first coating roll and second coating roll can provide effective support for the aluminium foil layer, avoid the aluminium foil layer to rock from top to bottom at the transmission in-process and lead to anodal thick liquids layer and solid electrolyte layer coating inhomogeneous, further improve the qualification rate of preparation positive plate, more effectively guarantee the performance of lamination battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a positive plate provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a laminated battery according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a positive plate coating device provided by the embodiment of the utility model.
Wherein, in the figures, the respective reference numerals:
10. the positive electrode plate coating device comprises a positive electrode plate, 11, an aluminum foil layer, 12, a positive electrode slurry layer, 13, a solid electrolyte layer, 14, a mixing layer, 20, a negative electrode plate, 21, a copper foil layer, 22, a lithium foil layer, 30, a positive electrode plate coating device, 31, a conveying mechanism, 311, an unreeling assembly, 3111, an unreeling roller, 3112, an unreeling motor, 312, a reeling assembly, 3121, a reeling roller, 3122, a reeling motor, 313, a conveying roller, 314, a first coating roller, 315, a second coating roller, 32, a first coating die head, 33, a second coating die head, 34 and an oven.
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 "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more 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; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example one
Referring to fig. 1, a positive electrode sheet 10 includes a solid electrolyte layer 13, a positive electrode paste layer 12 and an aluminum foil layer 11 stacked in sequence, wherein the solid electrolyte layer 13 and the positive electrode paste layer 12 are mixed to form a mixed layer 14.
According to the positive plate 10, the positive slurry layer 12 is coated on the aluminum foil layer 11, and then the solid electrolyte layer 13 is coated on the positive slurry layer 12, so that the solid electrolyte layer 13 and the positive slurry layer 12 are mixed to form the mixed layer 14, the bonding degree of the solid electrolyte layer 13 and the positive slurry layer 12 is effectively improved, the interface impedance between the solid electrolyte layer 13 and the positive slurry layer 12 is reduced, and the laminated battery is ensured to have better performance.
The positive electrode slurry can be prepared by mixing NCM (L iNi0.5 Co0.2 Mn0.3O 2, ternary positive electrode material), Surpe-P, polyvinylidene fluoride and polyethylene oxide according to the proportion of 91: 1: 3.5: 4.5.
Among them, the above solid electrolyte can be produced by dissolving polyoxyethylene powder in an NMP solvent at a ratio of 10% solid content.
Specifically, the cured areal density of the positive electrode slurry layer 12 was 250mg/1540.25mm2(ii) a The solidified areal density of the solid electrolyte layer 13 was 250mg/1540.25mm2. The solidified surface density is the surface density of the positive electrode slurry layer 12 and the solid electrolyte layer 13 after they are solidified from a molten state to a solid state.
In one embodiment, the solidified thickness of the solid electrolyte layer 13 is 10 μm to 30 μm. The solidified thickness is a thickness of the solid electrolyte layer 13 after it is solidified from a molten state to a solid state.
In one embodiment, the cured thickness of the positive electrode paste layer 12 is 100 μm to 150 μm. The solidified thickness is a thickness of the positive electrode slurry layer 12 after it is solidified from a molten state to a solid state.
In one embodiment, the aluminum foil layer 11 has a thickness of 12 μm to 15 μm.
Specifically, the cured thickness of the solid electrolyte layer 13 was 15 μm, the cured thickness of the positive electrode slurry layer 12 was 125 μm, and the thickness of the aluminum foil layer 11 was 13 μm. Of course, the cured thickness of the solid electrolyte layer 13, the cured thickness of the positive electrode slurry layer 12 and the thickness of the aluminum foil layer 11 can be designed and adjusted according to actual situations, for example, the thicknesses of the above layers are respectively adjusted to be 10 μm for the cured thickness of the solid electrolyte layer 13, 100 μm for the cured thickness of the positive electrode slurry layer 12 and 12 μm for the aluminum foil layer 11; the thickness of each layer is adjusted to 30 μm for the cured thickness of the solid electrolyte layer 13, 150 μm for the cured thickness of the positive electrode slurry layer 12, and 15 μm for the aluminum foil layer 11, respectively, and is not particularly limited herein.
Through measurement, the interface impedance of the laminated battery adopting the positive plate 10 is 0.4 omega, the capacity retention for 100 times of circulation is 91.2 percent, the interface impedance is low, and the battery performance is good.
Example two
The difference between the present embodiment and the first embodiment is that the positive electrode slurry can be prepared from a lithium iron phosphate positive electrode material, Surpe-P, polyvinylidene fluoride, and polyethylene oxide according to the following weight ratio of 91: 1: 3.5: 4.5 are mixed according to the proportion. The preparation process comprises the following steps: dissolving polyvinylidene fluoride in an NMP (N-methyl pyrrolidone) solvent according to the proportion, adding a lithium iron phosphate positive electrode material, Surpe-P and polyethylene oxide powder into the solution according to the proportion, and stirring to obtain the positive electrode slurry.
Through measurement, the interface impedance of the laminated battery adopting the positive plate 10 is 0.35 omega, the capacity retention capacity after 100 times of circulation is 94.6 percent, the interface impedance is low, and the battery performance is good.
EXAMPLE III
This example is different from the first example in that the solid electrolyte layer 13 after curing has an areal density of 15mg/1540.25mm2。
Through measurement, the interface impedance of the laminated battery adopting the positive plate 10 is 0.2 omega, the capacity retention capacity after 100 times of circulation is 93.3 percent, the interface impedance is low, and the battery performance is good.
Referring to fig. 2, a laminated battery includes a positive electrode sheet 10 and a negative electrode sheet 20, wherein the negative electrode sheet 20 includes a copper foil layer 21 and a lithium foil layer 22, and the copper foil layer 21, the lithium foil layer 22, a solid electrolyte layer 13 of the positive electrode sheet 10, a positive electrode slurry layer 12 of the positive electrode sheet 10, and an aluminum foil layer 11 of the positive electrode sheet 10 are sequentially laminated.
Since the laminated battery adopts all the embodiments of the positive electrode sheet 10, at least all the advantages of the embodiments are achieved, and no further description is given here.
In one embodiment, the copper foil layer 21 has a thickness of 6 μm to 10 μm.
In one embodiment, the lithium foil layer 22 has a thickness of 20 μm to 80 μm.
Specifically, the thickness of the copper foil layer 21 was 8 μm, and the thickness of the lithium foil layer 22 was 50 μm. Of course, the thickness of the copper foil layer 21 and the thickness of the lithium foil layer 22 can be designed and adjusted according to the actual situation, for example, the thicknesses of the above layers are respectively adjusted to 6 μm for the copper foil layer 21 and 20 μm for the lithium foil layer 22; the thicknesses of the above layers are adjusted to 10 μm for the copper foil layer 21 and 80 μm for the lithium foil layer 22, respectively, and are not particularly limited.
Referring to fig. 3, a positive electrode sheet coating apparatus 30 includes a conveying mechanism 31, and a first coating die 32, a second coating die 33 and an oven 34 sequentially disposed, wherein the conveying mechanism 31 conveys an aluminum foil layer 11 so that the aluminum foil layer 11 sequentially passes through the first coating die 32, the second coating die 33 and the oven 34, the first coating die 32 is used for coating a positive electrode slurry layer 12 on the aluminum foil layer 11, and the second coating die 33 is used for coating a solid electrolyte layer 13 on the positive electrode slurry layer 12.
The coating device 30 of the positive electrode plate continuously conveys the aluminum foil layer 11 through the conveying mechanism 31, meanwhile, the first coating die head 32 coats the positive electrode slurry layer 12 on the aluminum foil layer 11, the second coating die head 33 immediately coats the solid electrolyte layer 13 on the positive electrode slurry layer 12, so that the solid electrolyte layer 13 and the positive electrode slurry layer 12 are melted to form the mixed layer 14, then the conveying mechanism 31 conveys the solid electrolyte layer 13, the positive electrode slurry layer 12 and the aluminum foil layer 11 which are sequentially laminated into the oven 34, so that the solid electrolyte layer 13 and the positive electrode slurry layer 12 are heated and solidified, and the positive electrode plate 10 is obtained, the bonding degree of the solid electrolyte layer 13 and the positive electrode slurry layer 12 of the positive electrode plate 10 is effectively improved, the interface impedance between the solid electrolyte layer 13 and the positive electrode slurry layer 12 is reduced, and the laminated battery is ensured to have better performance.
Note that the thicknesses of the positive electrode slurry layer 12 and the solid electrolyte layer 13 may be changed by changing the conveying speed of the conveying mechanism 31 or changing the discharge speeds of the first coating die 32 and the second coating die 33.
In an embodiment, with continued reference to fig. 3, the transferring mechanism 31 includes an unwinding assembly 311, a winding assembly 312, and a plurality of transferring rollers 313 disposed between the unwinding assembly 311 and the winding assembly 312. By adopting the technical scheme, the aluminum foil layer 11 can be guaranteed to be conveyed at a constant speed, so that the anode slurry layer 12 and the solid electrolyte layer 13 are guaranteed to be coated uniformly, the qualification rate of the prepared anode plate 10 is improved, and the performance of the laminated battery is guaranteed more effectively.
Specifically, referring to fig. 3, the unwinding assembly 311 includes an unwinding shaft 3111 and an unwinding motor 3112, the winding assembly 312 includes a winding shaft 3121 and a winding motor 3122, during operation, an aluminum foil is firstly placed on the unwinding shaft 3111, and is pulled out, so that the aluminum foil is sequentially attached to the conveying rollers 313, then the end portion of the aluminum foil is fixed on the winding shaft 3121, then the unwinding motor 3112 and the winding motor 3122 are simultaneously started, the aluminum foil is tightened by matching the rotation speeds of the unwinding motor 3112 and the winding motor 3122, and then the positive paste layer 12 and the solid electrolyte layer 13 are sequentially coated on the aluminum foil through the first coating die 32 and the second coating die 33.
In an embodiment, with reference to fig. 3, the conveying mechanism 31 further includes a first coating roller 314 and a second coating roller 315 both disposed between the unwinding assembly 311 and the winding assembly 312, where the first coating roller 314 corresponds to the first coating die 32, and the second coating roller 315 corresponds to the second coating die 33. By adopting the technical scheme, the first coating roller 314 and the second coating roller 315 can provide effective support for the aluminum foil layer 11, so that the problem that the coating of the positive slurry layer 12 and the solid electrolyte layer 13 is uneven due to the fact that the aluminum foil layer 11 vertically shakes in the transmission process is avoided, the qualification rate of the prepared positive plate 10 is further improved, and the performance of the laminated battery is more effectively ensured.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A positive electrode sheet characterized in that: the aluminum foil is characterized by comprising a solid electrolyte layer, a positive electrode slurry layer and an aluminum foil layer which are sequentially stacked, wherein the solid electrolyte layer and the positive electrode slurry layer are blended to form a mixed layer.
2. The positive electrode sheet according to claim 1, wherein: the solid electrolyte layer has a cured thickness of 10 μm to 30 μm.
3. The positive electrode sheet according to claim 1, wherein: the curing thickness of the positive slurry layer is 100-150 mu m.
4. The positive electrode sheet according to claim 1, wherein: the thickness of the aluminum foil layer is 12-15 μm.
5. A laminated battery, characterized in that: the lithium ion battery comprises a positive plate and a negative plate, wherein the negative plate comprises a copper foil layer and a lithium foil layer, and the copper foil layer, the lithium foil layer, a solid electrolyte layer of the positive plate, a positive slurry layer of the positive plate and an aluminum foil layer of the positive plate are sequentially stacked.
6. The laminated battery of claim 5, wherein: the thickness of the copper foil layer is 6-10 μm.
7. The laminated battery of claim 5, wherein: the thickness of the lithium foil layer is 20-80 μm.
8. A positive plate coating device is characterized in that: the coating device comprises a conveying mechanism, a first coating die head, a second coating die head and an oven, wherein the first coating die head, the second coating die head and the oven are sequentially arranged, the conveying mechanism conveys an aluminum foil layer, so that the aluminum foil layer sequentially passes through the first coating die head, the second coating die head and the oven, the first coating die head is used for coating an anode slurry layer on the aluminum foil layer, and the second coating die head is used for coating a solid electrolyte layer on the anode slurry layer.
9. The positive electrode sheet coating apparatus according to claim 8, wherein: the conveying mechanism comprises an unreeling assembly, a reeling assembly and a plurality of conveying rollers arranged between the unreeling assembly and the reeling assembly.
10. The positive electrode sheet coating apparatus according to claim 9, wherein: the conveying mechanism further comprises a first coating roller and a second coating roller which are arranged between the unreeling component and the reeling component, the first coating roller corresponds to the first coating die head in position, and the second coating roller corresponds to the second coating die head in position.
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| CN202020069409.XU CN211088393U (en) | 2020-01-13 | 2020-01-13 | Positive plate, laminated battery and positive plate coating device |
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| CN202020069409.XU CN211088393U (en) | 2020-01-13 | 2020-01-13 | Positive plate, laminated battery and positive plate coating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112687844A (en) * | 2020-12-24 | 2021-04-20 | 中国电子新能源（武汉）研究院有限责任公司 | Battery production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112687844A (en) * | 2020-12-24 | 2021-04-20 | 中国电子新能源（武汉）研究院有限责任公司 | Battery production process |
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