CN212625652U - Pole piece, electrochemical device and electronic device - Google Patents
Pole piece, electrochemical device and electronic device Download PDFInfo
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- CN212625652U CN212625652U CN202021548630.XU CN202021548630U CN212625652U CN 212625652 U CN212625652 U CN 212625652U CN 202021548630 U CN202021548630 U CN 202021548630U CN 212625652 U CN212625652 U CN 212625652U
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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
Abstract
A pole piece comprises a pole piece main body and a pole lug, wherein the pole lug is formed by extending the pole piece main body along a first direction. The tab comprises N bending parts and N +1 laminated parts, one of the laminated parts is connected with the pole piece main body, N is a natural number greater than or equal to 1, and each bending part is connected with two laminated parts. The pole piece is beneficial to improving the overcurrent capacity and reducing the temperature rise. The application also provides an electrochemical device and an electronic device applying the pole piece.
Description
Technical Field
The present disclosure relates to the field of electrochemistry, and more particularly, to a pole piece, and an electrochemical device and an electronic device using the same.
Background
The lithium ion battery has the advantages of large specific energy, high working voltage, low self-discharge rate, small volume, light weight and the like, and has wide application in the field of consumer electronics. However, with the rapid development of electric vehicles and mobile electronic devices, there is an increasing demand for energy density, power density, safety, durability, cycle performance, and the like of batteries. In order to improve the energy density of the high-power battery in the prior art, the adopted current collector is thinner and thinner, and meanwhile, the thickness of a lug formed by extending the current collector is thinner and thinner, so that the overcurrent capacity of the lug is insufficient, the lug is overheated, and the performance of the battery is influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a pole piece that is beneficial for improving the over-current capability and reducing the temperature rise.
In addition, there is a need to provide an electrochemical device and an electronic device using the above electrode sheet.
The utility model provides a pole piece, including pole piece main part and utmost point ear, utmost point ear is formed by pole piece main part along first direction extension. The tab comprises N bending parts and N +1 laminated parts, one of the laminated parts is connected with the pole piece main body, N is a natural number greater than or equal to 1, and each bending part is connected with two laminated parts.
As an aspect of the present application, each of the bent portions is disposed along a second direction perpendicular to the first direction.
As one aspect of the present application, each of the bent portions is disposed along a first direction.
As a solution of the present application, the N bending portions include a first bending portion and a second bending portion, the first bending portion is disposed along a second direction perpendicular to the first direction, and the second bending portion is disposed along the first direction.
As an aspect of the application, the pole piece further comprises an electric connection portion, and the electric connection portion is connected between two adjacent laminated portions.
As one aspect of the present application, the electrical connection portion is a conductive paste or solder.
As a scheme of this application, the pole piece main part includes the mass flow body and active material layer, and the mass flow body includes first district and second district, and the active material layer sets up in first district, and at least one side in second district is exposed from the active material layer, and the one end that the range upon range of portion is close to the pole piece main part is connected with the second district.
As a scheme of this application, the pole piece includes a plurality of utmost point ears, and the interval and the structure are the same or different between two arbitrary utmost point ears.
The electrochemical device comprises a first pole piece, a second pole piece and a separation film positioned between the first pole piece and the second pole piece, wherein the first pole piece is the pole piece.
As a scheme of this application, first pole piece and second pole piece coiling setting are equipped with a plurality of utmost point ears on the first pole piece, and a plurality of utmost point ears set up relatively.
As a scheme of this application, first pole piece and second pole piece are laminated and are set up, and electrochemical device includes a plurality of first pole pieces, and the utmost point ear of a plurality of first pole pieces sets up relatively.
As a scheme of this application, wherein, mutually independent between arbitrary two utmost point ears, or one utmost point ear cover is located in another utmost point ear.
An electronic device of the present application includes an electrochemical device as above.
The utility model provides a pole piece and applied electrode subassembly of this pole piece, electrochemical device and electron device, because utmost point ear includes the range upon range of portion that a plurality of range upon range of settings, make the pole piece can realize under the prerequisite that does not increase utmost point ear occupation space on the width direction and the quantity of utmost point ear, improve the ability of overflowing of utmost point ear and avoid the problem that thin utmost point ear impedance is big partially simultaneously, thereby satisfy the charge-discharge requirement of high magnification, and can reduce the temperature rise when charging and discharging, and simultaneously, can also reduce the influence to energy density, promote power density.
Drawings
Fig. 1 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a current collector and a tab according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 10 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 11 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 12 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 13 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 14 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 15 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
FIG. 16 is a partial cross-sectional view of a pole piece according to an embodiment of the present application.
Fig. 17 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 18 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 19 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 20 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
Fig. 21 is a schematic structural view of an electrode assembly according to an embodiment of the present application.
Fig. 22 is a schematic view illustrating the structure of a tab in an electrode assembly according to an embodiment of the present application.
Fig. 23 is a schematic view illustrating the structure of a tab in an electrode assembly according to an embodiment of the present application.
Fig. 24 is a schematic structural view of an electrode assembly according to an embodiment of the present application.
Fig. 25 is a schematic structural view of an electrochemical device according to an embodiment of the present application.
Fig. 26 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Description of the main elements
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the application, A is vertical to B, or A is vertical to B, and the included angle formed between A and B is 85-95 degrees.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, according to one embodiment of the present application, a pole piece 10 includes a pole piece body 11 and a tab 15. The tab 15 is formed by extending the pole piece body 11 in the first direction X.
Referring to fig. 2, the pole piece body 11 includes a current collector 111. The tab 15 is formed by extending a current collector 111 from one end thereof.
Referring to fig. 3 to fig. 19, the tab 15 includes N bending portions 151 and N +1 stacked portions 153, and one of the stacked portions 153 extends from the current collector 111. Wherein N is a natural number greater than or equal to 1. Each of the bent portions 151 connects two laminated portions 153.
Each of the bent portions 151 may be disposed along the first direction X or along a second direction Y perpendicular to the first direction X. That is, the longitudinal direction of the bent portion 151 (i.e., the longitudinal direction of the fold when the tab is bent) is along the first direction X or the second direction Y.
The pole piece body 11 further includes an active material layer 113, and the active material layer 113 is disposed on the surface of the current collector 111.
The electrode sheet will be further described by way of examples.
First embodiment
Referring to fig. 1 and 3, the tab 15 includes a bent portion 151 and two stacked portions 153, wherein the bent portion 151 is disposed along a second direction Y perpendicular to the first direction X. The two laminated portions 153 are a first laminated portion 153a and a second laminated portion 153b, respectively. The first stacked portion 153a has one end connected to the current collector 111 and the other end connected to the bent portion 151. The second laminated portion 153b is laminated on the first laminated portion 153a, and one end thereof is connected to the bent portion 151. That is, the tab 15 is folded along the bent portion 151 in the second direction Y to form the above-described structure.
Second embodiment
Referring to fig. 4, the tab 15 includes two bending portions 151 and three laminating portions 153, wherein each bending portion 151 is disposed along a second direction Y perpendicular to the first direction X. The two bent portions 151 are a first bent portion 151a and a second bent portion 151b, respectively. The three laminated portions 153 are a first laminated portion 153a, a second laminated portion 153b, and a third laminated portion 153c, respectively. The first laminated portion 153a, the second laminated portion 153b, and the third laminated portion 153c are laminated in this order, one end of the first laminated portion 153a is connected to the pole piece main body 11, the first bent portion 151a is connected to an end of the first laminated portion 153a that is away from the pole piece main body 11 and an end of the adjacent second laminated portion 153b, and the second bent portion 151b is connected to an end of the second laminated portion 153b that is away from the first bent portion 151a and an end of the adjacent third laminated portion 153 c.
Third embodiment
Referring to fig. 5, the tab 15 includes two bending portions 151 and three laminating portions 153, wherein each bending portion 151 is disposed along a second direction Y perpendicular to the first direction X. The two bent portions 151 are a first bent portion 151a and a second bent portion 151b, respectively. The three laminated portions 153 are a first laminated portion 153a, a second laminated portion 153b, and a third laminated portion 153c, which are laminated, respectively. One end of the first laminated portion 153a is connected to the pole piece main body 11, the first bent portion 151a is connected to an end of the first laminated portion 153a away from the pole piece main body 11 and an end of the adjacent second laminated portion 153b, the third laminated portion 153c is located between the first laminated portion 153a and the second laminated portion 153b, and the second bent portion 151b is connected to an end of the second laminated portion 153b away from the first bent portion 151a and an end of the adjacent third laminated portion 153 c.
Fourth embodiment
Referring to fig. 6, the difference from the third embodiment is that three bending portions 151 further include a third bending portion 151 c; the number of the laminated portions 153 is four, and the laminated portion 153d further includes a fourth laminated portion 153 d.
The fourth laminated portion 153d is disposed between the first laminated portion 153a and the third laminated portion 153c, and the third bent portion 151c connects an end of the third laminated portion 153c away from the second bent portion 151b and an end of the adjacent fourth laminated portion 153 d.
Fifth embodiment
Referring to fig. 7, the difference from the third embodiment is that three bending portions 151 further include a third bending portion 151 c; the number of the laminated portions 153 is four, and the laminated portion 153d further includes a fourth laminated portion 153 d.
The fourth laminated portion 153d is disposed between the second laminated portion 153b and the third laminated portion 153c, and the third bent portion 151c connects an end of the third laminated portion 153c away from the second bent portion 151b and an end of the adjacent fourth laminated portion 153 d.
Sixth embodiment
Referring to fig. 8 and 9, the difference between the first embodiment and the second embodiment is that the bending portion 151 is disposed along the first direction X. The first stacked portion 153a extends from the fluid collector 111, and the bent portion 151 connects an end portion of the first stacked portion 153a disposed along the first direction X and an end portion of the adjacent second stacked portion 153b disposed along the first direction X. That is, the tab 15 is folded along the bent portion 151 in the first direction X to form the above-described structure.
Seventh embodiment
Referring to fig. 10, the difference between the first embodiment and the second embodiment is that each of the bent portions 151 is disposed along the first direction X. The first folded portion 153a extends from the pole piece body 11, the first bent portion 151a connects an end portion of the first folded portion 153a disposed along the first direction X and an end portion of the adjacent second folded portion 153b disposed along the first direction X, and the second bent portion 151b connects an end portion of the second folded portion 153b away from the first bent portion 151a and an end portion of the adjacent third folded portion 153 c.
Eighth embodiment
Referring to fig. 11, the difference from the third embodiment is that each of the bent portions 151 is disposed along the first direction X. The first folded portion 153a extends from the pole piece body 11, the first bent portion 151a connects an end portion of the first folded portion 153a disposed along the first direction X and an end portion of the adjacent second folded portion 153b disposed along the first direction X, and the second bent portion 151b connects an end portion of the second folded portion 153b away from the first bent portion 151a and an end portion of the adjacent third folded portion 153 c.
Ninth embodiment
Referring to fig. 12, the difference from the eighth embodiment is that three bending portions 151 further include a third bending portion 151 c; the number of the laminated portions 153 is four, and the laminated portion 153d further includes a fourth laminated portion 153 d.
The fourth laminated portion 153d is disposed between the second laminated portion 153b and the third laminated portion 153c, and the third bent portion 151c connects an end of the third laminated portion 153c away from the second bent portion 151b and an end of the adjacent fourth laminated portion 153 d.
Tenth embodiment
Referring to fig. 13, the difference from the ninth embodiment is that a fourth laminated portion 153d is disposed between the first laminated portion 153a and the third laminated portion 153 c.
Eleventh embodiment
Referring to fig. 14, the difference from the eighth embodiment is that the second bending portion 151b connects an end of the first laminated portion 153a away from the first bending portion 151a and an end of the adjacent third laminated portion 153 c.
Twelfth embodiment
Referring to fig. 15, the difference from the seventh embodiment is that a second stacked portion 153b, a first stacked portion 153a, and a third stacked portion 153c are sequentially stacked, a first bent portion 151a connects an end portion of the first stacked portion 153a disposed along the first direction X and an end portion of an adjacent second stacked portion 153b disposed along the first direction X, and a second bent portion 151b connects an end portion of the first stacked portion 153a away from the first bent portion 151a and an end portion of the adjacent third stacked portion 153 c.
Thirteenth embodiment
Referring to fig. 16, the difference between the third embodiment is that the first bending portion 151a is disposed along a second direction Y perpendicular to the first direction X, and the second bending portion 151b is disposed along the first direction X.
The first bent portion 151a connects an end of the first laminated portion 153a away from the pole piece body 11 and an end of the adjacent second laminated portion 153 b. The third laminated portion 153c is located on a side of the second laminated portion 153b facing the first laminated portion 153a, and the second bent portion 151b connects an end portion of the first laminated portion 153a disposed in the first direction X and an end portion of the adjacent third laminated portion 153c disposed in the first direction X.
Fourteenth embodiment
Referring to fig. 17, the pole piece 10 may further include at least one electrical connection portion 17, and each electrical connection portion 17 is connected between two adjacent stacked portions 153. Each electrical connection 17 may be, but is not limited to, a conductive paste or solder. Specifically, in the present embodiment, as shown in fig. 17, the electrical connection portion 17 is electrically connected between the first laminated portion 153a and the second laminated portion 153 b.
Fifteenth embodiment
Referring to fig. 18, the current collector 111 includes a first region 111a and a second region 111b, wherein the active material layer 113 is disposed in the first region 111a, at least one side of the second region 111b is exposed from the active material layer 113, and one end of the lamination portion 153 close to the pole piece body 11 is connected to the second region 111 b. Specifically, in the present embodiment, as shown in fig. 18, one end of the second laminated portion 153b close to the pole piece main body 11 is electrically connected to the second region 111 b.
Sixteenth embodiment
Referring to fig. 19, the pole piece 10 includes a plurality of tabs 15, and any two tabs 15 are spaced apart from each other, and the structure of any two tabs 15 may be the same. In the present embodiment, as shown in fig. 19, the pole piece 10 includes two tabs 15, and each tab 15 includes a bent portion 151 disposed along a second direction Y perpendicular to the first direction X
Seventeenth embodiment
Referring to fig. 20, the pole piece 10 includes a plurality of tabs 15, and any two tabs 15 are spaced apart from each other, and the structure of any two tabs 15 may be different. In the present embodiment, as shown in fig. 20, the pole piece 10 includes two tabs 15, wherein one tab 15 is folded once in a second direction Y perpendicular to the first direction X, and the other tab 15 is folded once in the first direction X.
In some embodiments, the shape of each lamination portion 153 is not limited to a rectangle, and may be other shapes, for example, the lamination portion 153 connected to the pole piece main body 11 has a width larger at the end connected to the pole piece main body 11 than at the end facing away from the pole piece main body 11.
Referring to fig. 21 to 24, the electrode sheet 10 is applied to an electrode assembly 100. The electrode assembly 100 includes a first pole piece 10a, a second pole piece 10b, and a separator 30 disposed between the first pole piece 10a and the second pole piece 10 b. The first pole piece 10a is the pole piece 10 provided in the present application.
As shown in fig. 21, the first pole piece 10a, the separator 30, and the second pole piece 10b are wound to form a wound electrode assembly 100.
In some embodiments, a plurality of tabs 15 may be disposed on the first pole piece 10a, and the tabs 15 are disposed oppositely. Referring to fig. 22, a plurality of tabs 15 are separated and stacked, and two adjacent tabs 15 can be electrically connected through a conductive portion 18. Referring to fig. 23, one tab 15 of any two tabs 15 may be sleeved in the other tab 15. The adjacent two tabs 15 can be electrically connected by the conductive portion 18. In some embodiments, one tab 15 can be sleeved in another tab 15 by first stacking a plurality of unfolded tabs 15 and then folding the tabs 15. In other embodiments, the one tab 15 is sleeved in the other tab 15, and the other manner can be formed.
As shown in fig. 24, the first and second pole pieces 10a and 10b may also be stacked such that the electrode assembly 100 is finally stacked.
In some embodiments, the electrode assembly 100 includes a plurality of first pole pieces 10a, and the tabs 15 of the plurality of first pole pieces 10a are oppositely disposed. The plurality of tabs 15 may be independent of each other (as shown in fig. 22), or one tab 15 may be sleeved in another tab 15 (as shown in fig. 23).
In some embodiments, the configuration of the tabs in the second pole piece 10b may be as described above for the tabs 15 in the pole piece 10.
The electrode assembly 100 is applied to an electrochemical device or an electronic device. The electrochemical device 200 (fig. 25) may be, but is not limited to, a battery. In some embodiments, the first direction X may be a length direction of the electrochemical device 200, and the second direction Y may be a width direction of the electrochemical device 200. In some embodiments, the first direction may also be a width direction of the electrochemical device 200, and the second direction Y is a length direction of the electrochemical device 200.
The electronic device 300 (fig. 26) may be, but is not limited to, an electric toy, an electric vehicle, a mobile phone, a wearable device, a tablet, a computer, an unmanned aerial vehicle, an energy storage device, and the like.
The pole piece 10 of this application, because utmost point ear 15 includes the range upon range of portion 153 of a plurality of range upon range of settings, make pole piece 10 can realize under the prerequisite that does not increase utmost point ear 15 occupation space and utmost point ear 15's quantity on width direction (second direction Y promptly), improve utmost point ear 15's overcurrent ability and avoid the problem that thin utmost point ear impedance is big on the earth simultaneously, thereby satisfy the charge-discharge requirement of high magnification, and the temperature rise when can reducing charge-discharge, and simultaneously, can also reduce the influence to energy density, promote power density.
In addition, it is obvious to those skilled in the art that other various corresponding changes and modifications can be made according to the technical idea of the present application, and all such changes and modifications should fall within the protective scope of the claims of the present application.
Claims (13)
1. A pole piece comprises a pole piece main body and a pole lug, wherein the pole lug is formed by extending the pole piece main body along a first direction,
the tab comprises N bending parts and N +1 laminated parts which are laminated, one of the laminated parts is connected with the pole piece main body, N is a natural number which is greater than or equal to 1, and each bending part is connected with two laminated parts.
2. The pole piece of claim 1, wherein each of the bent portions is disposed along a second direction perpendicular to the first direction.
3. The pole piece of claim 1, wherein each of the bent portions is disposed along the first direction.
4. The pole piece of claim 1, wherein the N number of the bent portions comprise a first bent portion and a second bent portion, the first bent portion is disposed along a second direction perpendicular to the first direction, and the second bent portion is disposed along the first direction.
5. The pole piece of claim 1, wherein the pole piece further comprises an electrical connection connected between two adjacent of the laminations.
6. The pole piece of claim 5, wherein the electrical connection is a conductive glue or solder.
7. The pole piece according to claim 1, wherein the pole piece main body comprises a current collector and an active material layer, the current collector comprises a first region and a second region, the active material layer is disposed in the first region, at least one side of the second region is exposed from the active material layer, and one end of the lamination portion near the pole piece main body is connected with the second region.
8. The pole piece according to any one of claims 1 to 7, wherein the pole piece comprises a plurality of pole lugs, and any two pole lugs are spaced apart and have the same or different structures.
9. An electrochemical device comprising a first pole piece, a second pole piece and a separator between the first pole piece and the second pole piece, wherein the first pole piece is the pole piece of any one of claims 1 to 7.
10. The electrochemical device according to claim 9, wherein the first pole piece and the second pole piece are wound, and a plurality of tabs are disposed on the first pole piece and are opposite to each other.
11. The electrochemical device of claim 9, wherein the first pole piece and the second pole piece are arranged in a stack, the electrochemical device comprising a plurality of first pole pieces, the tabs of the plurality of first pole pieces being oppositely disposed.
12. The electrochemical device according to claim 10 or 11, wherein any two tabs are independent from each other, or one tab is sleeved in the other tab.
13. An electronic device comprising the electrochemical device according to any one of claims 9 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021548630.XU CN212625652U (en) | 2020-07-30 | 2020-07-30 | Pole piece, electrochemical device and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021548630.XU CN212625652U (en) | 2020-07-30 | 2020-07-30 | Pole piece, electrochemical device and electronic device |
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| CN212625652U true CN212625652U (en) | 2021-02-26 |
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| CN202021548630.XU Active CN212625652U (en) | 2020-07-30 | 2020-07-30 | Pole piece, electrochemical device and electronic device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113853709A (en) * | 2020-07-30 | 2021-12-28 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electronic device |
| WO2023098324A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Electrode assembly and power battery |
-
2020
- 2020-07-30 CN CN202021548630.XU patent/CN212625652U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113853709A (en) * | 2020-07-30 | 2021-12-28 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electronic device |
| WO2023098324A1 (en) * | 2021-11-30 | 2023-06-08 | 宁德时代新能源科技股份有限公司 | Electrode assembly and power battery |
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