CN218069910U - Composite current collector, pole piece and battery - Google Patents
Composite current collector, pole piece and battery Download PDFInfo
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- CN218069910U CN218069910U CN202221777201.9U CN202221777201U CN218069910U CN 218069910 U CN218069910 U CN 218069910U CN 202221777201 U CN202221777201 U CN 202221777201U CN 218069910 U CN218069910 U CN 218069910U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The embodiment of the utility model provides a compound mass flow body, pole piece and battery relates to battery technical field. The composite current collector comprises a polymer layer and a conductive layer arranged on at least one surface of the polymer layer; a plurality of bulges are convexly arranged on at least one surface of the polymer layer, and a buffer space is formed among the polymer layer, the conductive layer and the bulges, so that the wetting capacity of the polymer layer to electrolyte can be improved.
Description
Technical Field
The utility model relates to a battery technology field particularly, relates to a compound mass flow body, pole piece and battery.
Background
With the rapid popularization of automobile electromotion, the occupation ratio of new energy automobiles in the automobile industry is rapidly enlarged, the demand of power batteries is increased day by day, and people also put forward higher demands on the performance of the power batteries; among them, safety performance and energy density are the most central issues.
At present, a current collector of a power battery generally uses a positive aluminum foil and a negative copper foil, so that the weight of the battery is increased, the weight energy density is low, and the battery can cause internal short circuit under some special conditions, for example, when positive and negative pole pieces in the battery are punctured by needles, so that the safety accidents of heating, smoke generation, even explosion, fire generation and the like of the battery are caused.
At present, the problem of safety can be solved by the existing composite current collector with a middle part being a polymer and metal-plated layers on two sides, and after the inside of a battery is short-circuited, the polymer layer can be melted due to high temperature, so that the structure of a battery core is damaged. However, such composite current collectors have the following drawbacks: the rolled and wound core pole piece of the composite current collector has the advantages that the polymer layer is stretched and rolled due to the fact that the elastic modulus of the polymer is larger than that of metal, and the polymer layer can rebound to a certain degree after being rolled into a battery core, so that stress exists in the core, the polymer layer has poor wetting capacity on electrolyte, and the cycle performance of the battery is affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a composite current collector, for example, it can promote the infiltration ability of polymer layer to electrolyte.
The utility model discloses a purpose still includes, provides a pole piece, and it can promote the infiltration ability of polymer layer to electrolyte.
The utility model discloses a purpose still includes, provides a battery, and it can promote the infiltration ability of polymer layer to electrolyte.
The embodiment of the utility model discloses a can realize like this:
an embodiment of the present invention provides a composite current collector, comprising a polymer layer and a conductive layer disposed on at least one surface of the polymer layer;
a plurality of bulges are convexly arranged on at least one surface of the polymer layer, and a buffer space is formed among the polymer layer, the conductive layer and the bulges.
Optionally, the protrusions are dot-shaped protrusions.
Optionally, the distance between adjacent protrusions is 0.05-10mm.
Optionally, the cross-sectional area of the protrusion is 1 μm 2 -10mm 2 (ii) a Wherein the cross-sectional area is taken by the protrusion in a plane parallel to the surface of the polymer layer.
Optionally, the thickness of the protrusion is 0.5-10 μm.
Optionally, the thickness of the polymer layer is 1 to 20 μm, and the thickness of the conductive layer is 0.05 to 10 μm.
Optionally, the polymer layer is made of any one of polyethylene terephthalate, polymethyl methacrylate, polyvinyl alcohol, polyvinyl chloride, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, polyacrylonitrile, polystyrene, polyacrylamide, polyimide, polyurethane, styrene butadiene rubber and aramid.
Optionally, the melting point of the polymer layer is less than the melting point of the conductive layer; the melting point of the polymer layer is 50-400 ℃.
The embodiment of the utility model also provides a pole piece, which comprises an active substance layer and the composite current collector; the active material layer is arranged on the surface of the conducting layer on the side far away from the polymer layer.
The embodiment of the utility model provides a battery is still provided, electric core including top cap, casing and foretell pole piece formation, electric core sets up the top cap with the casing encloses to close in the airtight space that forms.
The utility model discloses composite current collector's beneficial effect includes, for example: by arranging the conducting layer on at least one surface of the polymer layer and arranging the plurality of protrusions on at least one surface of the polymer layer in a protruding mode, a buffer space is provided for stress expansion of the pole piece among the polymer layer, the conducting layer and the plurality of protrusions, and the wetting capacity of the polymer layer to electrolyte is improved.
The utility model discloses the beneficial effect of pole piece includes, for example: the pole piece has simple structure, and the infiltration capacity of electrolyte can be improved through simple structural improvement, and the cycle performance of the battery is improved. And an expansion space can be provided for the expansion of the pole piece, so that the reliability of the pole piece is guaranteed, and the battery can operate safely and reliably.
The utility model discloses beneficial effect of battery includes, for example: the battery of the scheme has good soakage capacity of the electrolyte, so that the battery has excellent cycle performance, the battery capacity is improved, and the discharge rate characteristic of the battery is also improved. In addition, the battery has the advantages of better safety performance and reliability because the reliability of the pole piece is better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on these drawings without inventive efforts.
Fig. 1 is a schematic view for illustrating a positional relationship among a polymer layer, a conductive layer and an active material layer in this embodiment;
fig. 2 is a schematic partial structure diagram of the composite current collector for showing the buffer space in the present embodiment;
fig. 3 is a schematic diagram for illustrating the arrangement relationship of the plurality of protrusions in this embodiment.
Icon: 100-a polymer layer; 110-projection; 200-a conductive layer; 300-buffer space; 400-active substance layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The inventor of the application finds that the rolled and wound composite current collector core pole piece has larger elastic modulus due to the fact that the polymer is compared with metal, the polymer layer 100 is stretched and rolled, certain resilience can be generated after the polymer layer is rolled into a battery core, stress exists in the interior of the core, the polymer layer 100 has poor wetting capacity on electrolyte, and the cycle performance of the battery is affected. The present embodiment provides a composite current collector at least for solving this technical problem.
Referring to fig. 1 to fig. 3, the composite current collector provided in the present embodiment includes a polymer layer 100 and a conductive layer 200 disposed on at least one surface of the polymer layer 100; a plurality of protrusions 110 are protruded on at least one surface of the polymer layer 100, and a buffer space 300 is formed between the polymer layer 100, the conductive layer 200 and the plurality of protrusions 110.
It should be noted that after the battery is subjected to charge and discharge cycles, the positive electrode and the negative electrode both swell, which may cause stress in the winding core, and the polymer layer 100 has poor wetting ability for the electrolyte, thereby affecting the cycle performance of the battery.
In an alternative embodiment, the polymer layer 100 includes two opposite surfaces, each of the two surfaces is provided with the conductive layer 200, each of the two surfaces is provided with the plurality of protrusions 110, the plurality of protrusions 110 on one surface of the polymer layer 100 are located between the corresponding conductive layer 200 and the polymer layer 100, and the buffer space 300 is formed by the gaps between the conductive layer 200, the polymer layer 100 and the plurality of protrusions 110. Of course, in other embodiments, the protrusions 110 may be provided on only one of the surfaces of the polymer layer 100.
By disposing the conductive layer 200 on at least one surface of the polymer layer 100 and disposing the plurality of protrusions 110 on at least one surface of the polymer layer 100, the stress expansion between the polymer layer 100, the conductive layer 200, and the plurality of protrusions 110 to the pole piece provides a buffer space 300, which improves the wetting capability of the polymer layer 100 to the electrolyte.
In an alternative embodiment, the protrusions 110 are point-like protrusions. It is understood that the protrusion 110 may also be a protrusion 110 of other shapes, such as a square protrusion or a semi-circular protrusion.
In an alternative embodiment, the number of the protrusions 110 includes a plurality, and the distance between adjacent protrusions 110 is 0.05 to 10mm.
The plurality of protrusions 110 are arranged in a matrix form, and the distance between every two adjacent protrusions 110 is 0.05-10mm; for example, the distance between adjacent protrusions 110 is 0.05mm, 1mm, 5mm, or 10mm. It is understood that the plurality of protrusions 110 may also be arranged in other directions, for example, the plurality of protrusions 110 may be arranged in a circumferential direction.
In an alternative embodiment, the cross-sectional area of the protrusion 110 is 1 μm 2 -10mm 2 (ii) a Wherein the cross-sectional area is taken by the protrusions 110 in a plane parallel to the surface of the polymer layer 100.
The cross-sectional area of the protrusions 110 in a cross-section parallel to the surface of the polymer layer 100 depends on the actual situation, for example, the cross-sectional area of the protrusions 110 in a cross-section parallel to the surface of the polymer layer 100 is 1 μm 2 、1mm 2 Or 10mm 2 。
In an alternative embodiment, the thickness of the protrusions 110 is 0.5-10 μm.
It is noted that the thickness direction of the protrusions 110 is perpendicular to the surface of the polymer layer 100 on which the protrusions 110 are disposed. The thickness of the bump 110 depends on the actual situation, and the bump 110 has a thickness of 0.5 μm, 1 μm, 5 μm, or 10 μm, for example.
In an alternative embodiment, the polymer layer 100 has a thickness of 1-20 μm and the conductive layer 200 has a thickness of 0.05-10 μm.
It should be noted that the thickness direction of the polymer layer 100 and the thickness direction of the conductive layer 200 are consistent with the thickness direction of the protrusion 110, and the thickness of the polymer layer 100 and the thickness of the conductive layer 200 are determined according to actual conditions, for example, the thickness of the polymer layer 100 is 1 μm, 5 μm, 10 μm or 20 μm, and the thickness of the conductive layer 200 is 0.05 μm, 1 μm, 5 μm or 10 μm.
In an alternative embodiment, the polymer layer 100 is made of any one of polyethylene terephthalate, polymethyl methacrylate, polyvinyl alcohol, polyvinyl chloride, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, polyacrylonitrile, polystyrene, polyacrylamide, polyimide, polyurethane, styrene butadiene rubber, and aramid.
It should be noted that the polymer layer 100 includes at least one of polyethylene terephthalate, polymethyl methacrylate, polyvinyl alcohol, polyvinyl chloride, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, polyacrylonitrile, polystyrene, polyacrylamide, polyimide, polyurethane, styrene butadiene rubber, and aramid, and the composition of the polymer layer 100 may be determined according to actual conditions.
In an alternative embodiment, the melting point of the polymer layer 100 is less than the melting point of the conductive layer 200; the melting point of the polymer layer 100 is 50 to 400 ℃.
The melting point of the polymer layer 100 is less than that of the conductive layer 200, so that the polymer layer 100 can be melted at a high temperature, the structure of the battery cell is damaged, and the problem of battery cell safety is solved. The polymer layer 100 may have a melting point of 50 ℃, 100 ℃, 200 ℃ or 400 ℃.
In addition, the present embodiment further provides a pole piece, which includes the active material layer 400 and the composite current collector; the active material layer 400 is provided on the surface of the conductive layer 200 on the side away from the polymer layer 100.
In an alternative embodiment, the conductive layers 200 are disposed on two opposite surfaces of the polymer layer 100, the number of the active material layers 400 also includes two, and the two active material layers 400 are disposed on the surfaces of the two conductive layers 200 away from the polymer layer 100.
When the electrode plate is a positive electrode plate, the active material layer 400 includes a binder and a positive active material, the positive active material includes any one or a mixture of lithium cobaltate, lithium manganate, lithium nickel cobalt manganese, lithium nickel cobalt aluminate, lithium iron phosphate, lithium manganese iron phosphate, and lithium titanate, and the conductive layer 200 is made of aluminum.
When the pole piece is a negative pole piece, the negative active material layer 400 comprises a binder and a negative active material, the negative active material is one or more of natural graphite, artificial graphite, mesophase micro carbon spheres (MCMB for short), hard carbon, soft carbon, silicon, a silicon-carbon composite, a Li-Sn alloy, a Li-Sn-O alloy, siOx (wherein x is more than 0 and less than 2), sn, snO2, spinel-structured lithiated TiO2-Li4Ti5O12 and Li-Al alloy, and the conducting layer 200 is made of copper.
The protrusions 110 may be disposed on both the polymer layer 100 in the positive electrode plate and the polymer layer 100 in the negative electrode plate, after the charge and discharge cycle of the battery, the negative electrode expands, and particularly when the negative electrode is made of a silicon material, the negative electrode expansion rate is higher, at this time, the protrusions 110 disposed on the polymer layer 100 in the positive electrode plate may provide the buffer space 300 for the expansion of the negative electrode plate, and it is understood that the protrusions 110 disposed on the polymer layer 100 in the negative electrode plate may also provide the buffer space 300 for the expansion of the positive electrode plate.
The pole piece provided by the embodiment can improve and improve the infiltration capacity of the electrolyte through simple structural improvement, and the cycle performance of the battery is improved. And an expansion space can be provided for the expansion of the pole piece, so that the reliability of the pole piece is guaranteed, and the battery can operate safely and reliably.
In addition, this embodiment also provides a battery, including top cap, casing and the electric core that the aforesaid pole piece formed, the electric core setting is in the airtight space that top cap and casing enclose and close the formation.
The battery provided by the embodiment has excellent cycle performance due to better wetting capacity of the electrolyte, the battery capacity is improved, and the discharge rate characteristic of the battery is also improved. In addition, the battery has the advantages of better safety performance and reliability due to better reliability of the pole pieces.
To sum up, the embodiment of the utility model provides a compound mass flow body, pole piece and battery through establish a plurality of archs 110 at 100 at least one surperficial epirelief on polymer layer, through shape, arranging, thickness and cross sectional area to these a plurality of archs 110 prescribe a limit to for these a plurality of archs 110 can provide buffer space 300 for the stress expansion of polymer layer 100, and then promote the infiltration ability of polymer layer 100 to electrolyte and the cycling performance of battery.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A composite current collector, characterized by comprising a polymer layer (100) and an electrically conductive layer (200) disposed on at least one surface of said polymer layer (100);
a plurality of protrusions (110) are convexly arranged on at least one surface of the polymer layer (100), and a buffer space (300) is formed among the polymer layer (100), the conductive layer (200) and the protrusions (110).
2. The composite collector of claim 1, wherein the protrusions (110) are punctiform protrusions.
3. The composite collector of claim 1, wherein the distance between adjacent protrusions (110) is 0.05-10mm.
4. The composite current collector of claim 1, wherein the cross-sectional area of the protrusions (110) is 1 μ ι η 2 -10mm 2 ；
Wherein the cross-sectional area is taken by the protrusions (110) in a plane parallel to the surface of the polymer layer (100).
5. The composite collector as claimed in claim 1, characterised in that the thickness of the protrusions (110) ranges from 0.5 to 10 μ ι η.
6. The composite collector as claimed in claim 1, characterised in that the thickness of the polymer layer (100) is comprised between 1 and 20 μm and the thickness of the conductive layer (200) is comprised between 0.05 and 10 μm.
7. The composite collector as claimed in claim 1, wherein the polymer layer (100) is made of any one of polyethylene terephthalate, polymethyl methacrylate, polyvinyl alcohol, polyvinyl chloride, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, polyacrylonitrile, polystyrene, polyacrylamide, polyimide, polyurethane, styrene-butadiene rubber, and aramid.
8. The composite current collector of claim 1, wherein the melting point of the polymer layer (100) is less than the melting point of the conductive layer (200); the melting point of the polymer layer (100) is 50-400 ℃.
9. A pole piece comprising an active material layer (400) and a composite current collector according to any one of claims 1 to 8; the active material layer (400) is provided on the surface of the conductive layer (200) on the side away from the polymer layer (100).
10. A battery comprising a top cover, a casing, and a cell formed by the pole piece of claim 9, wherein the cell is disposed in a closed space defined by the top cover and the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202221777201.9U CN218069910U (en) | 2022-07-11 | 2022-07-11 | Composite current collector, pole piece and battery |
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| CN202221777201.9U CN218069910U (en) | 2022-07-11 | 2022-07-11 | Composite current collector, pole piece and battery |
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| CN218069910U true CN218069910U (en) | 2022-12-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117219894A (en) * | 2023-11-08 | 2023-12-12 | 江苏正力新能电池技术有限公司 | Pole piece, battery and electric equipment |
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2022
- 2022-07-11 CN CN202221777201.9U patent/CN218069910U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117219894A (en) * | 2023-11-08 | 2023-12-12 | 江苏正力新能电池技术有限公司 | Pole piece, battery and electric equipment |
| CN117219894B (en) * | 2023-11-08 | 2024-03-22 | 江苏正力新能电池技术有限公司 | Pole piece, battery and electric equipment |
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