CN214176073U - Battery pole piece, battery roll core, battery and current collector - Google Patents
Battery pole piece, battery roll core, battery and current collector Download PDFInfo
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- CN214176073U CN214176073U CN202120382814.1U CN202120382814U CN214176073U CN 214176073 U CN214176073 U CN 214176073U CN 202120382814 U CN202120382814 U CN 202120382814U CN 214176073 U CN214176073 U CN 214176073U
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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
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The application discloses battery pole piece, battery roll core, battery and mass flow body, this battery pole piece includes: the current collector comprises a first current collector layer, an insulating layer and a second current collector layer which are arranged in a stacked mode, wherein a first groove is formed in the first current collector layer, a second groove is formed in the second current collector layer, the first groove and the second groove are arranged oppositely, and a containing gap is formed by the first groove and the second groove in a surrounding mode; the lug is arranged in the accommodating gap, and two phase back surfaces of the lug are respectively and electrically connected with the first current collector layer and the second current collector layer; and the active material layer is arranged on the surface of the first current collector layer, which is far away from the insulating layer, and is arranged on the surface of the second current collector layer, which is far away from the insulating layer. Therefore, the current density distribution of the battery pole piece can be reduced, and the impedance of the battery pole piece is reduced, so that the aim of reducing the impedance of a battery roll core or a battery manufactured based on the battery pole piece is fulfilled.
Description
Technical Field
This application belongs to battery technical field, concretely relates to battery pole piece, battery roll core, battery and mass flow body.
Background
With the development of the technology, the energy density of the polymer lithium ion battery is higher and higher, and the charging rate is larger. Moreover, because the high-energy lithium ion battery has a large impedance, the temperature rise is large in the process of charging and discharging under a large multiplying power, and the cycle life of the battery is further influenced.
It can be seen that the high-energy battery in the related art has a problem of large impedance.
SUMMERY OF THE UTILITY MODEL
The application aims at providing a battery pole piece, a battery roll core, a battery and a current collector, and can solve the problem that a high-energy battery in the related technology has high impedance.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a battery pole piece, including:
the current collector comprises a first current collector layer, an insulating layer and a second current collector layer which are arranged in a stacked mode, wherein a first groove is formed in the first current collector layer, a second groove is formed in the second current collector layer, the first groove and the second groove are arranged oppositely, and an accommodating gap is formed by the first groove and the second groove in an enclosing mode;
the tab is arranged in the accommodating gap, and two phase back surfaces of the tab are respectively and electrically connected with the first current collector layer and the second current collector layer; and the number of the first and second groups,
and the active material layer is arranged on the surface of the first current collector layer, which is far away from the insulating layer, and is arranged on the surface of the second current collector layer, which is far away from the insulating layer.
Optionally, the first groove and the second groove are arranged oppositely.
Optionally, the first current collector layer and the second current collector layer each have a thickness of 1 to 10 micrometers.
Optionally, the thickness of the insulating layer is 0.5 to 5 micrometers.
Optionally, the thickness of the tab is 50 to 100 micrometers, and the width of the tab is 4 to 10 millimeters.
In a second aspect, an embodiment of the present application provides a battery roll core, including the battery pole piece of the first aspect.
Optionally, the current collector is an N-fold current collector, the first groove of the current collector is located at the X-fold of the first current collector layer of the current collector, the second groove of the current collector is located at the X-fold of the second current collector layer of the current collector, and N is a positive integer;
wherein, X is more than or equal to N/8 and less than or equal to 3N/8.
Optionally, the current collector is an M-fold current collector, the first groove of the current collector is located at the Y-fold of the first current collector layer of the current collector, the second groove of the current collector is located at the Y-fold of the second current collector layer of the current collector, and M is a positive integer;
wherein Y is more than or equal to 3M/8 and less than or equal to 5M/8.
In a third aspect, the present application provides a battery, including the battery roll core of the second aspect.
In a fourth aspect, embodiments of the present application provide a current collector, including: first current collector layer, insulating layer and the second current collector layer of range upon range of setting, first current collector layer is equipped with first recess, the second current collector layer is equipped with the second recess, first recess with the second recess sets up relatively, just first recess with the second recess encloses to establish and forms an accommodation clearance, the accommodation clearance is used for setting up utmost point ear.
In the embodiment of the application, through the insulating layer isolation setting of first current collector layer and second current collector layer, and through the two-phase back surface of utmost point ear respectively with first current collector layer and second current collector layer electricity connection, can realize the parallel connection of the first current collector layer and the second current collector layer of battery pole piece, can realize the parallel structure of battery pole piece, can reduce the current density distribution of battery pole piece like this, and reduce the impedance of battery pole piece, thereby reach the purpose that reduces the impedance of the battery core or battery that rolls based on this battery pole piece preparation.
Additional aspects and advantages of the present application 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 present application.
Drawings
The above and/or additional aspects and advantages of the present application 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 structural diagram of a battery pole piece according to an embodiment of the present disclosure;
FIG. 2 is a second schematic view of the structure of a battery pole piece according to an embodiment of the present disclosure;
FIG. 3 is a third schematic view illustrating a structure of a battery pole piece according to an embodiment of the present disclosure;
fig. 4 is a schematic structural view of a current collector of an embodiment of the present application;
FIG. 5 is a schematic structural view of a first current collector layer according to an embodiment of the present application;
FIG. 6 is a schematic structural view of a second current collector layer according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a battery roll core according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, 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 only for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1 to 6, an embodiment of the present application provides a battery pole piece, including:
the current collector 10, the current collector 10 includes a first current collector layer 11, an insulating layer 12 and a second current collector layer 12 which are stacked, the first current collector layer 11 is provided with a first groove 111, the second current collector layer 13 is provided with a second groove 131, the first groove 111 and the second groove 131 are arranged oppositely, and the first groove 111 and the second groove 131 enclose to form an accommodating gap 14;
the tab 20 is arranged in the accommodating gap 14, and two back surfaces of the tab 20 are respectively electrically connected with the first current collector layer 11 and the second current collector layer 13; and the number of the first and second groups,
and an active material layer 30, wherein the active material layer 30 is provided on the surface of the first current collector layer 11 facing away from the insulating layer 12, and on the surface of the second current collector layer 13 facing away from the insulating layer 12.
In this embodiment, the first current collector layer 11 and the second current collector layer 13 are isolated from each other by the insulating layer 12, and the two back surfaces of the tab 20 are electrically connected to the first current collector layer 11 and the second current collector layer 13, respectively, so that the first current collector layer 11 and the second current collector layer 13 of the battery pole piece can be connected in parallel, that is, the parallel structure of the battery pole piece can be realized, thereby reducing the current density distribution of the battery pole piece, and reducing the impedance of the battery pole piece, and achieving the purpose of reducing the impedance of a battery roll core or a battery manufactured based on the battery pole piece.
Moreover, by reducing the impedance of the battery pole piece, the service life of a battery or a battery roll core manufactured based on the battery pole piece can be prolonged.
The tab 20 may be disposed in the receiving gap 14 by welding, and two back surfaces of the tab 20 are electrically connected to the first current collector layer 11 and the second current collector layer 13, respectively. In addition, the insulating layer 12 may be a plastic film.
In the case that the battery electrode plate is a battery positive electrode plate, the current collector 10 may be a double-sided aluminum-plated film, that is, a layer of aluminum film is plated on both the upper and lower surfaces of the plastic film to form the current collector 10. Wherein the plastic film may be a layer of insulating material.
In the case where the battery pole piece is a battery negative pole piece, the first current collector layer 11 and the second current collector layer 13 may be copper-plated layers provided on the insulating layer 12, and the insulating layer 12 may be a plastic film.
In the embodiment where the battery sheet is a battery positive electrode sheet, the active material layer 30 is a positive electrode active material layer; the positive active material layer may be a conventional positive active material, and may be formed on the current collector 10 by coating a positive active material slurry, so as to prepare a positive electrode sheet of a battery.
In embodiments where the battery sheet is a battery negative sheet, the active material layer 30 is a negative active material layer; the negative electrode active material layer may be a conventional negative electrode active material, and the negative electrode active material may be formed on the current collector 10 by coating the negative electrode active material slurry to prepare the negative electrode sheet of the battery.
Among other things, the resistance of the battery pole pieces is also affected by the different welding positions of the tabs 20 on the current collector 10.
In an impedance test of the battery pole piece, under the condition that the current collector is a conventional single-layer current collector and the tab is arranged at the empty foil of the current collector, the impedance of the battery pole piece is 35m omega; as shown in fig. 1, in the case where the current collector is a double-layer current collector in the present application, and the tab is disposed at the empty foil of the current collector, the impedance of the battery pole piece is 30m Ω; as shown in fig. 2, in the case where the current collector is a double-layer current collector in the present application, and the tab is provided corresponding to the active material layer, and the tab 20 is located at 1/4 of the active material layer, the impedance of the battery pole piece is 25m Ω; as shown in fig. 3, in the case where the current collector is a double-layer current collector in the present application, and the tab is provided corresponding to the active material layer, and the tab 20 is located at 1/2 of the active material layer, the impedance of the battery pole piece is 20m Ω.
The impedance test tests show that compared with the conventional single-layer current collector, the current collector in the application can effectively reduce the impedance of the battery pole piece; in addition, when the tab 20 is provided corresponding to the active material layer 30 and is located at 1/2 of the active material layer, the impedance of the battery pole piece is lower, that is, the impedance of the battery pole piece can be further reduced, and the performance of the battery winding core or the battery manufactured by the battery pole piece can be further improved.
In the process of forming the active material layer 30 by coating, the tab 20 can be connected in the accommodating gap 14 before coating, and the tab position of the battery pole piece can be wound without using adhesive paper; in the process of forming the active material layer 30 by sheet production, the tab 20 can be connected to the receiving space 14 during sheet production, and the tab position of the battery sheet needs to be additionally provided with adhesive tape during winding.
In one embodiment of the battery pole piece, the first current collector layer 11 and the second current collector layer 13 are both 1 to 10 micrometers thick; the thickness of the insulating layer 12 is 0.5 to 5 micrometers; the thickness of the pole ear 20 is 50-100 microns, and the width of the pole ear 20 is 4-10 mm; the thickness of the tab 20 of the battery pole piece is 52-120 microns, namely the sum of the thicknesses of the first current collector layer 11, the second current collector layer 13 and the tab 20.
In addition, the first groove 111 and the second groove 131 may be arranged opposite to each other to facilitate welding the tab 20 in the receiving gap 14.
As shown in fig. 4 to 6, embodiments of the present application further provide a current collector, where the current collector 10 includes: the electrode plate comprises a first current collector layer 11, an insulating layer 12 and a second current collector layer 13 which are arranged in a stacked mode, wherein the first current collector layer 11 is provided with a first groove 111, the second current collector layer 13 is provided with a second groove 131, the first groove 111 and the third groove 131 are arranged oppositely, a containing gap 14 is formed by the first groove 111 and the third groove 131 in a surrounding mode, and the containing gap 14 is used for arranging an electrode lug.
In this embodiment, two layers about with the current collector 10 atmosphere to locate utmost point ear between first current collector layer 11 and second current collector layer 13, in order to realize the parallel connection of first current collector layer 11 and second current collector layer 13, can reduce the current density distribution of the battery pole piece based on this current collector preparation, and then reach the purpose that reduces the impedance of battery pole piece.
The embodiment of the application also provides a battery roll core, and the battery roll core comprises the battery pole piece.
As shown in fig. 7, the battery roll core includes a battery positive electrode tab 510, a separator 520, and a battery negative electrode tab 530, which are wound.
The battery positive electrode sheet 510 is the battery positive electrode sheet in the above embodiment; accordingly, the battery negative electrode tab 530 is the battery negative electrode tab in the above embodiment.
Optionally, the current collector 10 is an N-fold current collector, the first groove 111 of the current collector 10 is located at the X-fold of the first current collector layer 11 of the current collector 10, the second groove 131 of the current collector 10 is located at the X-fold of the second current collector layer 13 of the current collector, and N is a positive integer;
wherein, X is more than or equal to N/8 and less than or equal to 3N/8.
In this embodiment, by such an arrangement, the receiving gap 14 for providing the tab 20 can be located at the X-th fold of the current collector 10, that is, the tab 20 can be provided corresponding to the active material layer 30, and the tab 20 can be located at the X-th fold of the wound battery winding core, so as to achieve the purpose of reducing the impedance of the battery pole piece.
Optionally, the current collector 10 is an M-fold current collector, the first groove 111 of the current collector 10 is located at the Y-fold of the first current collector layer 11 of the current collector 10, the second groove 131 of the current collector 10 is located at the Y-fold of the second current collector layer 13 of the current collector, and N is a positive integer;
wherein Y is more than or equal to 3M/8 and less than or equal to 5M/8.
In this embodiment, by such an arrangement, the accommodating gap 14 for providing the tab 20 can be located at the Y-th fold of the current collector 10, that is, the tab 20 can be provided corresponding to the active material layer 30, and the tab 20 can be located at the Y-th fold of the wound battery winding core, so as to achieve the purpose of reducing the impedance of the battery pole piece.
The number of folds of the current collector 10 is the number of folds of the current collector 10 in the winding process of the battery pole piece. The current collector is bent for N times, which indicates that the current collector 10 is bent for N times in the winding process of the battery pole piece; correspondingly, M-fold current collector means that current collector 10 is bent M times during the winding process of the battery pole piece.
It should be noted that, the implementation manner of the above-mentioned embodiment of the battery pole piece is also applicable to the embodiment of the battery winding core, and can achieve the same technical effect, and is not described herein again.
The embodiment of the application also provides a battery, which comprises the battery winding core.
It should be noted that the implementation manner of the battery roll core embodiment is also applicable to the battery embodiment, and can achieve the same technical effect, and details are not described herein again.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means 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 application. In this specification, the schematic representations of the terms used above do not necessarily 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.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A battery pole piece, comprising:
the current collector comprises a first current collector layer, an insulating layer and a second current collector layer which are arranged in a stacked mode, wherein a first groove is formed in the first current collector layer, a second groove is formed in the second current collector layer, the first groove and the second groove are arranged oppositely, and an accommodating gap is formed by the first groove and the second groove in an enclosing mode;
the tab is arranged in the accommodating gap, and two phase back surfaces of the tab are respectively and electrically connected with the first current collector layer and the second current collector layer; and the number of the first and second groups,
and the active material layer is arranged on the surface of the first current collector layer, which is far away from the insulating layer, and is arranged on the surface of the second current collector layer, which is far away from the insulating layer.
2. The battery pole piece of claim 1, wherein the first groove and the second groove are disposed in facing relationship.
3. The battery pole piece of claim 1 or 2, wherein the first current collector layer and the second current collector layer each have a thickness of 1-10 microns.
4. The battery pole piece of claim 1 or 2, wherein the insulating layer has a thickness of 0.5 to 5 microns.
5. The battery pole piece of claim 1 or 2, wherein the tab has a thickness of 50-100 microns and a width of 4-10 mm.
6. A battery jellyroll characterized by comprising the battery pole piece of any one of claims 1 to 5.
7. The battery jelly roll of claim 6, wherein the current collector is an N-fold current collector, the first recess of the current collector is located at the Xth fold of the first current collector layer of the current collector, the second recess of the current collector is located at the Xth fold of the second current collector layer of the current collector, and N is a positive integer;
wherein, X is more than or equal to N/8 and less than or equal to 3N/8.
8. The battery jelly roll of claim 6, wherein the current collector is an M-fold current collector, the first recess of the current collector is located at the Yth fold of the first current collector layer of the current collector, the second recess of the current collector is located at the Yth fold of the second current collector layer of the current collector, and M is a positive integer;
wherein Y is more than or equal to 3M/8 and less than or equal to 5M/8.
9. A battery comprising a battery jelly roll according to any one of claims 6 to 8.
10. A current collector, comprising: first current collector layer, insulating layer and the second current collector layer of range upon range of setting, first current collector layer is equipped with first recess, the second current collector layer is equipped with the second recess, first recess with the second recess sets up relatively, just first recess with the second recess encloses to establish and forms an accommodation clearance, the accommodation clearance is used for setting up utmost point ear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120382814.1U CN214176073U (en) | 2021-02-20 | 2021-02-20 | Battery pole piece, battery roll core, battery and current collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120382814.1U CN214176073U (en) | 2021-02-20 | 2021-02-20 | Battery pole piece, battery roll core, battery and current collector |
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| Publication Number | Publication Date |
|---|---|
| CN214176073U true CN214176073U (en) | 2021-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120382814.1U Active CN214176073U (en) | 2021-02-20 | 2021-02-20 | Battery pole piece, battery roll core, battery and current collector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548346A (en) * | 2022-09-23 | 2022-12-30 | 厦门海辰储能科技股份有限公司 | Current collecting assembly and battery |
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2021
- 2021-02-20 CN CN202120382814.1U patent/CN214176073U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548346A (en) * | 2022-09-23 | 2022-12-30 | 厦门海辰储能科技股份有限公司 | Current collecting assembly and battery |
| CN115548346B (en) * | 2022-09-23 | 2024-02-20 | 厦门海辰储能科技股份有限公司 | Current collecting assembly and battery |
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