CN212485372U - Current collector, electrode plate and lithium ion battery - Google Patents
Current collector, electrode plate and lithium ion battery Download PDFInfo
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- CN212485372U CN212485372U CN202021249608.5U CN202021249608U CN212485372U CN 212485372 U CN212485372 U CN 212485372U CN 202021249608 U CN202021249608 U CN 202021249608U CN 212485372 U CN212485372 U CN 212485372U
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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
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- 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 utility model relates to the technical field of batteries, the utility model provides a mass flow body, electrode slice and lithium ion battery, above-mentioned mass flow body is including having the base member of scribbling the covering, many recesses have been seted up on the covering of scribbling of base member, the cross section of each recess all is the trapezium structure, can effectively improve the bonding strength of base member and electrode material and increase the area of contact of base member and electrode material through the aforesaid setting, thereby electron conductivity between above-mentioned mass flow body and the electrode material, effectively reduce the contact internal resistance of above-mentioned mass flow body, it is visible, the internal resistance of the battery that adopts above-mentioned mass flow body is less, more be favorable to the battery to carry.
Description
Technical Field
The utility model relates to the technical field of batteries, especially, provide a mass flow body, electrode slice and lithium ion battery.
Background
The current collector is a battery component for collecting current, and the current collector mainly has the function of collecting the current generated by the electrode material so as to form larger current and output the large current to the outside, so that whether the current collector is in full contact with the electrode material or not directly determines the internal resistance of the battery, and has important significance for improving the performance of the battery.
At present, a battery manufacturer usually directly coats an electrode material on a current collector, and then bakes the current collector to realize the adhesion and fixation of the electrode material and the current collector. However, the current collector fixed by the above-mentioned bonding method has a small bonding strength with the electrode material, and the contact area between the current collector and the electrode material is also small, which results in a large increase in the contact internal resistance of the current collector, and is not favorable for the battery to perform large-rate charge and discharge.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a mass flow body, electrode slice and lithium ion battery aims at solving the current mass flow body and electrode material's the low and little technical problem of area of contact of bond strength.
In order to achieve the above object, the utility model adopts the following technical scheme: a current collector comprises a base body with a coating surface, wherein a plurality of grooves are formed in the coating surface of the base body, and the cross section of each groove is of a trapezoidal structure.
The utility model provides a mass flow body has following beneficial effect at least: when the coating surface of the substrate is coated with the electrode material, the electrode material can flow into each groove on the substrate, after the electrode material is solidified, one part of the electrode material layer is adhered to the coating surface between two adjacent grooves, and the other part of the electrode material layer is embedded into each groove, so that the adhesion between the substrate and the electrode material layer is realized through a concave-convex structure, and the adhesion strength between the substrate and the electrode material is effectively improved; in addition, the coating surface of the substrate is provided with the groove, and the cross section of the groove is in a trapezoidal structure, so that the contact area between the electrode material and the substrate can be effectively increased; so, can effectively improve the adhesive strength of base member and electrode material and increase the area of contact of base member and electrode material through above-mentioned setting to the electron conductivity between above-mentioned mass flow body and the electrode material effectively reduces the contact internal resistance of above-mentioned mass flow body. Therefore, the internal resistance of the battery adopting the current collector is low, and the battery is more favorable for high-rate charge and discharge.
In one embodiment, the grooves are spaced apart from and parallel to each other.
By adopting the technical scheme, the bonding uniformity of the substrate and the electrode material can be effectively improved, so that the bonding strength of the substrate and the electrode material is further improved.
In one embodiment, the two adjacent grooves have equal spacing.
By adopting the technical scheme, the bonding uniformity of the substrate and the electrode material can be more effectively improved, so that the bonding strength of the substrate and the electrode material is further improved.
In one embodiment, the distance between two adjacent grooves is 0.01 mm-10 mm.
Through adopting above-mentioned technical scheme, inject the interval of two adjacent recesses in suitable scope, both can effectively guarantee the bonding degree of consistency between base member and the electrode material, make have sufficient adhesive strength between base member and the electrode material, can avoid appearing again because of the condition that the extension performance of two adjacent recesses undersize leads to the base member descends.
In one embodiment, each groove is divided into a first groove group and a second groove group, and the first groove group and the second groove group are arranged in a staggered mode to form a grid structure.
By adopting the technical scheme, the grooves are uniformly distributed along all directions of the coating surface of the base body, the bonding uniformity of the base body and the electrode material can be effectively improved, the bonding strength of the base body and the electrode material is further improved, meanwhile, the contact area of the base body and the electrode material can be further increased, and the contact internal resistance of the current collector is more effectively reduced.
In one embodiment, in the first groove group, the grooves are arranged in parallel at intervals, and the distance between two adjacent grooves is 0.01 mm-10 mm;
in the second groove group, the grooves are arranged in parallel at intervals, and the distance between two adjacent grooves is 0.01 mm-10 mm.
By adopting the technical scheme, the distance between two adjacent grooves in the first groove group and the distance between two adjacent grooves in the second groove group are limited in a proper range, so that the bonding uniformity between the matrix and the electrode material can be effectively ensured, the matrix and the electrode material have enough bonding strength, and the condition that the extensibility of the matrix is reduced due to the fact that the distance between two adjacent grooves in the first groove group and the distance between two adjacent grooves in the second groove group are too small can be avoided.
In one embodiment, the depth of each groove is 0.05 μm to 5 μm.
By adopting the technical scheme, the depth of each groove is limited in a proper range, so that the sufficient bonding strength and contact area between the base body and the electrode material can be effectively ensured, and the condition that the extension performance of the base body is reduced due to the overlarge depth of the groove can be avoided.
In one embodiment, the width of each groove is 0.01 mm-10 mm.
By adopting the technical scheme, the width of each groove is limited in a proper range, so that the bonding uniformity between the base body and the electrode material can be effectively ensured, the sufficient bonding strength is ensured between the base body and the electrode material, and the condition that the extension performance of the base body is reduced due to the overlarge width of each groove can be avoided.
In order to achieve the above object, the present invention further provides an electrode plate, including the above current collector.
Since the electrode plate adopts all the embodiments of the current collector, at least all the beneficial effects of the embodiments are achieved, and no further description is given here.
In order to achieve the above object, the present invention also provides a lithium ion battery, including the above electrode plate.
Since the lithium ion battery adopts all the embodiments of the electrode sheet, at least all the beneficial effects of the embodiments are achieved, and no further description is given here.
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 current collector according to an embodiment of the present invention;
fig. 2 is a left side view of the current collector shown in fig. 1;
fig. 3 is a cross-sectional view taken along a-a of the current collector shown in fig. 2;
fig. 4 is an enlarged schematic view of the current collector shown in fig. 3 at a;
fig. 5 is a schematic structural diagram of a current collector according to another embodiment of the present invention;
fig. 6 is an enlarged schematic view of the current collector shown in fig. 5 at B.
Wherein, in the figures, the respective reference numerals:
10. the substrate 11, the coating surface 12, the groove 121, the first groove group 122 and the second groove group.
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", "up", "down", 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 simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
It should be noted that, in fig. 4, reference h denotes the depth of the groove 12, reference w denotes the width of the groove 12, and reference d1 denotes the distance between two adjacent grooves 12 in the first embodiment; reference numeral d2 in fig. 5 denotes the distance between two adjacent grooves 12 in the first groove set of the second embodiment, and reference numeral d3 denotes the distance between two adjacent grooves 12 in the second groove set of the second embodiment.
Example one
Referring to fig. 1 to 4, a current collector includes a substrate 10 having a coating surface 11, wherein the coating surface 11 of the substrate 10 is provided with a plurality of grooves 12, and a cross section of each groove 12 is a trapezoid structure.
When the coating surface 11 of the substrate 10 is coated with the electrode material, the electrode material flows into each groove 12 on the substrate 10, after the electrode material is solidified, one part of the electrode material layer is adhered to the coating surface 11 between two adjacent grooves 12, and the other part of the electrode material layer is embedded into each groove 12, so that the substrate 10 and the electrode material layer are adhered through a concave-convex structure, and the adhesion strength of the substrate 10 and the electrode material is effectively improved; in addition, the coating surface 11 of the substrate 10 is provided with the groove 12, and the cross section of the groove 12 is in a trapezoidal structure, so that the contact area between the electrode material and the substrate 10 can be effectively increased; therefore, the bonding strength of the base body 10 and the electrode material can be effectively improved and the contact area of the base body 10 and the electrode material can be increased through the arrangement, so that the electron conduction capacity between the current collector and the electrode material can be effectively improved, and the contact internal resistance of the current collector can be effectively reduced. Therefore, the internal resistance of the battery adopting the current collector is low, and the battery is more favorable for high-rate charge and discharge.
Specifically, the substrate 10 may be one of a copper foil substrate, an aluminum foil substrate, a stainless steel foil substrate, a nickel foil substrate, a carbon paper substrate, a functional coating foil substrate, and a film body having a conductive ability, which is not particularly limited herein.
Specifically, the grooves 12 may be formed in the substrate 10 by laser etching, and of course, there are various grooving methods, such as chemical etching, and the like, and are not particularly limited herein.
Specifically, referring to fig. 1 to 4, the substrate 10 has two opposite coating surfaces 11, and each of the two coating surfaces 11 has a plurality of grooves 12.
In the present embodiment, please refer to fig. 1 to 4, the grooves 12 are arranged in parallel and spaced apart from each other. By adopting the technical scheme, the bonding uniformity of the base body 10 and the electrode material can be effectively improved, so that the bonding strength of the base body 10 and the electrode material is further improved.
Specifically, referring to fig. 1 to 4, the distance d1 between two adjacent grooves 12 is equal. By adopting the technical scheme, the bonding uniformity of the base body 10 and the electrode material can be more effectively improved, so that the bonding strength of the base body 10 and the electrode material is further improved.
Specifically, referring to fig. 1 to 4, the distance d1 between two adjacent grooves 12 is 0.01mm to 10 mm. By adopting the technical scheme, the distance d1 between two adjacent grooves 12 is limited in a proper range, so that the bonding uniformity between the base body 10 and the electrode material can be effectively ensured, the base body 10 and the electrode material have enough bonding strength, and the situation that the extensibility of the base body 10 is reduced due to the fact that the distance d1 between two adjacent grooves 12 is too small can be avoided.
It should be noted that the distance d1 between two adjacent grooves 12 can be any value in the above range, such as 0.01mm, 5mm, 10mm, etc., and is not limited herein.
In the present embodiment, please refer to fig. 1 to 4, the depth h of each groove 12 is 0.05 μm to 5 μm. By adopting the technical scheme, the depth h of each groove 12 is limited in a proper range, so that the sufficient bonding strength and contact area between the base body 10 and the electrode material can be effectively ensured, and the condition that the extension performance of the base body 10 is reduced due to the overlarge depth of the groove 12 can be avoided.
It should be noted that the depth h of each groove 12 may take any value in the above-mentioned range of values, such as 0.05 μm, 2.5 μm, 5 μm, etc., and is not particularly limited herein.
In the present embodiment, please refer to fig. 1 to 4, the width w of each groove 12 is 0.01mm to 10 mm. By adopting the technical scheme, the width w of each groove 12 is limited in a proper range, so that the bonding uniformity between the base body 10 and the electrode material can be effectively ensured, the base body 10 and the electrode material have enough bonding strength, and the condition that the extension performance of the base body 10 is reduced due to the overlarge width of each groove 12 can be avoided.
The width of the groove 12 refers to the width of the groove surface flush with the coated surface 11, and the width w of each groove 12 may be any value in the above-mentioned range, such as 0.01mm, 5mm, 10mm, and the like, and is not particularly limited.
Example two
In this embodiment, please refer to fig. 5 and 6, each groove 12 is divided into a first groove group 121 and a second groove group 122, and the first groove group 121 and the second groove group 122 are arranged in a staggered manner to form a grid structure. By adopting the technical scheme, the grooves 12 are uniformly distributed along all directions of the coating surface 11 of the matrix 10, so that the bonding uniformity of the matrix 10 and the electrode material can be effectively improved, the bonding strength of the matrix 10 and the electrode material is further improved, meanwhile, the contact area of the matrix 10 and the electrode material can be further increased, and the contact internal resistance of the current collector is more effectively reduced.
Specifically, as shown in fig. 5 and fig. 6, in the first groove group 121, the grooves 12 are arranged in parallel and at intervals, and the distance d2 between two adjacent grooves 12 is 0.01mm to 10 mm; in the second groove group 122, the grooves 12 are arranged in parallel and at intervals, and the distance d3 between two adjacent grooves 12 is 0.01 mm-10 mm. By adopting the above technical solution, the distance d2 between two adjacent grooves 12 in the first groove group 121 and the distance d3 between two adjacent grooves 12 in the second groove group 122 are both limited to a proper range, which not only can effectively ensure the bonding uniformity between the substrate 10 and the electrode material, and make the substrate 10 and the electrode material have sufficient bonding strength, but also can avoid the situation that the extensibility of the substrate 10 is reduced due to the fact that the distance d2 between two adjacent grooves 12 in the first groove group and the distance d3 between two adjacent grooves 12 in the second groove group are both too small.
It should be noted that in the first groove group 121, the distance d2 between two adjacent grooves 12 can be any value in the above range, such as 0.01mm, 5mm, 10mm, etc.; similarly, in the second groove group 122, the distance d3 between two adjacent grooves 12 can be any value in the above range, such as 0.01mm, 5mm, 10mm, etc., but is not limited thereto.
In order to achieve the above object, the present invention further provides an electrode plate, including the above current collector.
Since the electrode plate adopts all the embodiments of the current collector, at least all the beneficial effects of the embodiments are achieved, and no further description is given here.
In order to achieve the above object, the present invention also provides a lithium ion battery, including the above electrode plate.
Since the lithium ion battery adopts all the embodiments of the electrode sheet, at least all the beneficial effects of the embodiments are achieved, and no further description is given here.
The current collector is further described by comparative experiments.
Experiment group one: an experimental current collector is manufactured by adopting an aluminum foil with the thickness of 16 micrometers through a laser etching mode, wherein the depth h of each groove 12 of the current collector is 1.5 micrometers, the width w of each groove 12 is 2mm, the grooves 12 are arranged in parallel at intervals, and the distance d between every two adjacent grooves 12 is 2 mm.
Control group one: aluminum foil with a thickness of 16 μm was used as a control current collector.
Respectively adopting an experimental current collector and a comparison current collector to prepare an experimental lithium ion battery and a comparison lithium ion battery, and respectively carrying out rate charge-discharge test, cycle test and direct current internal resistance test on the experimental lithium ion battery and the comparison lithium ion battery to obtain the following experimental results:
experiment group two: an experimental current collector is manufactured by adopting an aluminum foil with the thickness of 9 micrometers through a laser etching mode, wherein the depth h of each groove 12 of the current collector is 1 micrometer, the width w of each groove 12 is 3mm, the grooves 12 are arranged in parallel at intervals, and the distance d between every two adjacent grooves 12 is 3 mm.
Control group two: copper foil with a thickness of 9 μm was used as a control current collector.
Respectively adopting an experimental current collector and a comparison current collector to prepare an experimental lithium ion battery and a comparison lithium ion battery, and respectively carrying out rate charge-discharge test, cycle test and direct current internal resistance test on the experimental lithium ion battery and the comparison lithium ion battery to obtain the following experimental results:
can know from above-mentioned two sets of contrast experiments, compare with the lithium ion battery that adopts ordinary plane mass flow body to make, adopt the embodiment of the utility model provides a mass flow body makes lithium ion battery has less internal resistance to and more superior multiplying power charge-discharge performance and charge-discharge cycle performance.
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 current collector comprising a substrate having a coated surface, wherein: a plurality of grooves are formed in the coating surface of the substrate, and the cross section of each groove is of a trapezoidal structure.
2. The current collector of claim 1, wherein: the grooves are arranged in parallel and at intervals.
3. The current collector of claim 2, wherein: the distance between two adjacent grooves is equal.
4. The current collector of claim 3, wherein: the distance between two adjacent grooves is 0.01 mm-10 mm.
5. The current collector of claim 1, wherein: each groove is divided into a first groove group and a second groove group, and the first groove group and the second groove group are arranged in a staggered mode to form a grid structure.
6. The current collector of claim 5, wherein:
in the first groove group, the grooves are arranged in parallel at intervals, and the distance between two adjacent grooves is 0.01-10 mm;
in the second groove group, the grooves are arranged in parallel at intervals, and the distance between two adjacent grooves is 0.01-10 mm.
7. The current collector of any one of claims 1 to 6, wherein: the depth of each groove is 0.05-5 μm.
8. The current collector of any one of claims 1 to 6, wherein: the width of each groove is 0.01 mm-10 mm.
9. An electrode slice, its characterized in that: comprising a current collector as claimed in any one of claims 1 to 8.
10. A lithium ion battery, characterized by: comprising an electrode sheet according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021249608.5U CN212485372U (en) | 2020-06-30 | 2020-06-30 | Current collector, electrode plate and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021249608.5U CN212485372U (en) | 2020-06-30 | 2020-06-30 | Current collector, electrode plate and lithium ion battery |
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| CN212485372U true CN212485372U (en) | 2021-02-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204038A (en) * | 2021-12-07 | 2022-03-18 | 远景动力技术(江苏)有限公司 | Current collector and application thereof |
| WO2023221606A1 (en) * | 2022-05-20 | 2023-11-23 | 宁德时代新能源科技股份有限公司 | Current collector, electrode sheet, electrode assembly, battery cell, battery and electric apparatus |
-
2020
- 2020-06-30 CN CN202021249608.5U patent/CN212485372U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204038A (en) * | 2021-12-07 | 2022-03-18 | 远景动力技术(江苏)有限公司 | Current collector and application thereof |
| CN114204038B (en) * | 2021-12-07 | 2024-01-26 | 远景动力技术(江苏)有限公司 | Current collector and application thereof |
| WO2023221606A1 (en) * | 2022-05-20 | 2023-11-23 | 宁德时代新能源科技股份有限公司 | Current collector, electrode sheet, electrode assembly, battery cell, battery and electric apparatus |
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