CN113078370A - Winding type battery cell and battery - Google Patents
Winding type battery cell and battery Download PDFInfo
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- CN113078370A CN113078370A CN202110319746.9A CN202110319746A CN113078370A CN 113078370 A CN113078370 A CN 113078370A CN 202110319746 A CN202110319746 A CN 202110319746A CN 113078370 A CN113078370 A CN 113078370A
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- 238000004804 winding Methods 0.000 title claims abstract description 27
- 239000007774 positive electrode material Substances 0.000 claims abstract description 19
- 239000007773 negative electrode material Substances 0.000 claims abstract description 15
- 239000011888 foil Substances 0.000 claims description 26
- 239000012528 membrane Substances 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 13
- 239000011149 active material Substances 0.000 description 8
- 239000006183 anode active material Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- -1 Polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910013015 LiCoAlO2 Inorganic materials 0.000 description 1
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 229910015009 LiNiCoMnO2 Inorganic materials 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The application discloses coiling formula electricity core and battery belongs to battery technical field. The winding type battery cell comprises a positive plate and a negative plate, wherein the positive plate comprises a first section and a second section, and the negative plate comprises a third section; the first section and the third section are respectively wound along a first direction to form a winding structure; the outermost circle of the first section is positioned on the inner side of the outermost circle of the third section, and the second section is wound from the tail end of the first section to the second direction to cover the outermost circle of the third section; wherein, the two sides of the third segment are coated with symmetrically distributed negative active material layers, and the surfaces of the first segment and the second segment are respectively coated with positive active material layers opposite to the negative active material layers. According to the scheme provided by the embodiment of the application, the problem of lithium precipitation caused by the existence of the single-side paste coating area in the conventional negative plate can be solved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a winding type battery cell and a battery.
Background
At present, in the manufacturing process of a winding type battery cell structure, when an active material is coated on a negative electrode sheet, the active material layers coated on two sides of the negative electrode sheet are not completely symmetrically arranged, that is, the negative electrode sheet has a position where only one side is coated with the active material layer. For example, when the outer side of the outermost circle of the negative electrode sheet does not have a positive electrode sheet opposite thereto, the outermost circle of the negative electrode sheet is provided as a single-sided pasted region, i.e., the active material is applied only to the inner side of the outermost circle of the negative electrode sheet, so that the energy density of the battery can be improved.
However, the above-mentioned single-sided pasting method may cause the current density of the single-sided pasting region of the negative electrode sheet to be higher than that of the double-sided pasting region, thereby causing the problem of lithium precipitation in the single-sided pasting region of the negative electrode sheet during large-current charging.
Disclosure of Invention
The application provides a coiling type battery core and battery, can alleviate the problem of lithium precipitation caused by the existence of a single-side paste coating area in the conventional negative plate.
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 wound electrical core, including a positive electrode tab and a negative electrode tab, where the positive electrode tab includes a first segment and a second segment, and the negative electrode tab includes a third segment;
the first section and the third section are respectively wound along a first direction to form a winding structure;
the outermost circle of the first section is positioned on the inner side of the outermost circle of the third section, and the second section is wound from the tail end of the first section to the second direction to cover the outermost circle of the third section;
wherein, the two sides of the third segment are coated with symmetrically distributed negative active material layers, and the surfaces of the first segment and the second segment are respectively coated with positive active material layers opposite to the negative active material layers.
Optionally, one of the first direction and the second direction is clockwise, and the other is counterclockwise.
Optionally, an outer side wall of an innermost ring of the first section is opposite to an inner side wall of an innermost ring of the third section;
the outer side wall of the innermost circle of the first segment is coated with the positive electrode active material layer, and the inner side wall of the innermost circle of the first segment forms a first hollow foil area.
Optionally, the inner sidewall of the second segment is coated with the positive electrode active material layer, and the outer sidewall of the second segment forms a second empty foil region.
Optionally, the positive plate further comprises a fourth segment extending inward from the head end of the first segment, and the negative plate further comprises a fifth segment extending inward from the head end of the third segment;
the fourth section and the fifth section form a hollow foil area respectively, positive electrode lugs are arranged on the surface of the fourth section, and negative electrode lugs are arranged on the surface of the fifth section.
Optionally, a third empty foil area is formed on the first segment, a fourth empty foil area is formed on the third segment, a positive tab is arranged on the surface of the third empty foil area, and a negative tab is arranged on the surface of the fourth empty foil area.
Optionally, the positive electrode tab and the negative electrode tab are arranged in a staggered manner.
Optionally, a separator is arranged between the negative electrode plate and the positive electrode plate.
Optionally, the diaphragm extends to an outer side of the second section.
In a second aspect, an embodiment of the present application provides a battery, including the winding type battery cell described in the first aspect.
In the embodiment of the application, the negative active material layers are symmetrically coated on two sides of the paste coating area of the negative plate, so that the problem of lithium precipitation caused by the single-side paste coating area of the negative plate can be avoided; meanwhile, the second section is arranged to be opposite to the outer side wall of the outermost circle of the negative plate, so that the energy density of the battery can be improved.
Drawings
Fig. 1 is one of schematic structural diagrams of a winding type battery cell in an embodiment of the present application;
fig. 2 is a schematic view showing the development of the positive electrode sheet of fig. 1;
fig. 3 is a schematic developed view of the negative electrode tab of fig. 1;
fig. 4 is a second schematic structural diagram of a winding type battery cell in the embodiment of the present application;
fig. 5 is a schematic view showing the development of the positive electrode sheet of fig. 4;
fig. 6 is a development view of the negative electrode tab of fig. 4.
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 some, but not all, embodiments of 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 terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. 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.
Referring to fig. 1 to 6, a wound electrical core provided in an embodiment of the present application includes a positive electrode sheet 100 and a negative electrode sheet 200, where the positive electrode sheet 100 includes a first segment 111 and a second segment 112, and the negative electrode sheet 200 includes a third segment 211; the first section 111 and the third section 211 are respectively wound along a first direction to form a winding structure;
the outermost turn of the first segment 111 is located inside the outermost turn of the third segment 211, and the second segment 112 is wound in the second direction from the end of the first segment 111 to cover the outermost turn of the third segment 211;
wherein, both sides of the third segment 211 are coated with symmetrically distributed anode active material layers 230, and the surfaces of the first segment 111 and the second segment 112 are respectively coated with cathode active material layers 150 opposite to the anode active material layers 230.
The first segment 111 and the third segment 211 may be disposed in parallel and opposite to each other, the end of the first segment 111 may be aligned with the end of the third segment 211, and the head of the first segment 111 may be aligned with the head of the third segment 211, wherein the head of the first segment 111 is the end located at the innermost side when the first segment 111 is in the winding state, and the end of the first segment 111 is the end located at the outermost side when the first segment 111 is in the winding state. Accordingly, the head end of the third segment 211 refers to the end located at the innermost side when the third segment 211 is in the winding state, and the tail end of the third segment 211 refers to the end located at the outermost side when the third segment 211 is in the winding state.
The outermost circle of the first section 111 is: when the first section 111 is in the winding state, it is located at the outermost circumference of the first section 111. Accordingly, the innermost circle of the first segment 111 refers to: when the first section 111 is in the winding state, it is located at the innermost circumference of the first section 111. The innermost circle of the third section 211 refers to: when the third segment 211 is in a winding state, it is located at the innermost circumference of the third segment 211. Correspondingly, the outermost turn of the third segment 211 is: when the third segment 211 is in a winding state, the third segment is located at the outermost circumference of the third segment 211.
It is understood that the first segment 111 is integrally formed with the second segment 112, and the second segment 112 is located outside the first segment 111 when the positive electrode tab 100 is in a rolled state.
The negative electrode active material layer 230 may be coated on the negative electrode collector 210 of the negative electrode tab 200, and accordingly, the positive electrode active material layer 150 may be coated on the positive electrode collector 110 of the positive electrode tab 100. Wherein, the coating of the symmetrically distributed anode active material layers 230 on both sides of the third segment 211 may refer to: the anode active material layers 230 positioned at both sides of the third section 211 are symmetrically distributed about the third section 211.
The material of the negative electrode collector 210 may be set according to actual needs. In the embodiment of the present application, the negative electrode current collector 210 may be a copper foil. Meanwhile, the kind and ratio of the active material in the anode active material layer 230 may be set according to actual needs, and may generally include graphite, hard carbon, silicon oxide, and the like.
The material of the positive electrode collector 110 may be set according to actual needs. In the embodiment of the present application, the positive electrode collector 110 may be an aluminum foil. Meanwhile, the kind and ratio of the active material in the positive electrode active material layer 150 may be set according to actual needs, and may generally include LiCoO2, LiNiCoMnO2, LiCoAlO2, LiMn2O4, and the like.
The second segment 112 is wound in a second direction from the end of the first segment 111 to cover the outermost turn of the third segment 211, that is, the second segment 112 is opposite to the outer side of the outermost turn of the third segment 211.
In this embodiment, by symmetrically applying the negative electrode active material layers 230 on both sides of the pasted region of the negative electrode sheet 200, it is possible to avoid the problem of lithium deposition due to the presence of the single-sided pasted region of the negative electrode sheet 200. Meanwhile, the second segment 112 is arranged opposite to the outer side wall of the outermost ring of the negative plate 200, so that the negative active material layer 230 on the outer side wall of the outermost ring of the negative plate 200 can interact with the positive active material layer 150 on the surface of the second segment 112, thereby participating in the generation process of electric energy, avoiding the problem of reduction of energy density of the battery due to the fact that the negative active material layer 230 on the outer side wall of the outermost ring of the negative plate 200 does not have a positive plate opposite to the negative active material layer, and further improving the energy density of the battery.
Optionally, one of the first direction and the second direction is clockwise, and the other is counterclockwise.
Referring to fig. 1, in one embodiment of the present application, the first section 111 is wound clockwise and the second section 112 is wound counterclockwise. In this way, the length of the positive electrode tab 100 can be effectively shortened, and at the same time, it is ensured that the second segment 112 can be opposed to the outer side of the outermost circle of the third segment 211.
Optionally, an outer sidewall of an innermost circle of the first segment 111 is opposite to an inner sidewall of an innermost circle of the third segment 211, the outer sidewall of the innermost circle of the first segment 111 is coated with the positive electrode active material layer 150, and the inner sidewall of the innermost circle of the first segment 111 forms the first empty foil region 130.
In this embodiment, the outer sidewall of the innermost circle of the first segment 111 is opposite to the inner sidewall of the innermost circle of the third segment 211, and the outer sidewall of the innermost circle of the first segment 111 is coated with the positive active material layer 150, so that the negative active material layer 230 located on the inner sidewall of the innermost circle of the third segment 211 can interact with the positive active material layer 150 on the surface of the first segment 112, thereby participating in the generation process of electric energy, avoiding the problem of reduction of the energy density of the battery due to the absence of a positive plate opposite to the negative active material layer 230 on the inner sidewall of the innermost circle of the third segment 211, and further improving the energy density of the battery.
In addition, since the negative electrode sheet 200 does not exist on the inner sidewall of the innermost circumference of the first segment 111, even if the positive electrode active material layer 150 is coated on the inner sidewall of the innermost circumference of the first segment 111, the positive electrode active material layer 150 located on the inner sidewall of the innermost circumference of the first segment 111 cannot participate in the generation process of electric energy as an active material. Based on this, in the embodiment of the present application, the first empty foil region 130 is formed on the inner side wall of the innermost circle of the first segment 111, so that the energy density of the winding type battery cell can be further improved, and the volume and the weight of the whole winding type battery cell can be reduced.
Optionally, the inner sidewall of the second segment is coated with the positive electrode active material layer 150, and the outer sidewall of the second segment 112 forms a second empty foil region 140.
In this embodiment, since the negative electrode sheet 200 does not exist on the outer sidewall of the second segment 112, even if the positive electrode active material layer 150 is coated on the outer sidewall of the second segment 112, the positive electrode active material layer 150 located on the outer sidewall of the second segment 112 cannot participate in the generation process of electric energy as an active material. Based on this, in the embodiment of the present application, the outer side wall of the second segment 112 is formed into the second empty foil region 140, so that the energy density of the winding type battery cell can be further improved, and at the same time, the volume and weight of the whole winding type battery cell can be reduced.
Optionally, the positive electrode tab 100 further comprises a fourth segment 113 extending inwardly from the innermost end of the first segment 111, and the negative electrode tab 200 further comprises a fifth segment 212 extending inwardly from the innermost end of the third segment 211;
the fourth segment 113 and the fifth segment 212 respectively form a hollow foil area, a positive tab 120 is arranged on the surface of the fourth segment 113, and a negative tab 220 is arranged on the surface of the fifth segment 212. Alternatively, the first and second electrodes may be,
a third empty foil area is formed on the first segment 111, a fourth empty foil area is formed on the third segment 211, a positive tab 120 is arranged on the surface of the third empty foil area, and a negative tab 220 is arranged on the surface of the fourth empty foil area.
The positive tab 120 and the negative tab 220 are disposed in a staggered manner.
Specifically, the positive electrode tab 120 may be disposed at different positions of the positive electrode tab 100, and accordingly, the negative electrode tab 220 may be disposed at different positions of the negative electrode tab 200. For example, referring to fig. 1, in one embodiment of the present application, the positive tab 120 and the negative tab 220 are disposed at the innermost ends of the positive tab 100 and the negative tab 200, respectively. Referring to fig. 4, the positive tab 120 and the negative tab 220 are disposed in the third empty foil area and the fourth empty foil area, respectively. By providing positive tab 120 and negative tab 220, electrical connection between the battery and an external electrical device is facilitated.
In addition, in this embodiment, the positive tab 120 and the negative tab 220 are arranged in a staggered manner, so that the positive tab 120 and the negative tab 220 are prevented from contacting with each other, and the problem of short circuit of the battery is avoided.
Optionally, a separator 300 is disposed between the negative electrode tab 200 and the positive electrode tab 100.
The separator 300 may include a substrate and a coating layer, wherein the substrate may be a Polyethylene (PE) monolayer film, a polypropylene (PP) monolayer film or a polypropylene-polyethylene-polypropylene three-layer composite film, and the coating layer may be at least one of porous silicon dioxide, aluminum oxide, titanium dioxide and zirconium dioxide.
In this embodiment, the separator 300 is interposed between the negative electrode tab 200 and the positive electrode tab 100, so that the positive electrode active material layer 150 and the negative electrode active material layer 230 are prevented from being in direct contact.
Optionally, the septum 300 extends outside of the second section 112.
In this embodiment, the separator 300 extends to the outermost side of the second segment 112, so that the winding type battery cell can be covered in the separator 300, and external pollutants effectively prevented from entering the winding type battery cell.
This application still provides a battery, the battery includes above-mentioned embodiment coiling formula electricity core, because the battery that this application provided includes above-mentioned embodiment coiling formula electricity core, consequently, the battery that this application provided can realize above-mentioned coiling formula electricity core's whole beneficial effect, for avoiding repetition, no longer gives unnecessary details here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A winding type battery cell is characterized by comprising a positive plate and a negative plate, wherein the positive plate comprises a first section and a second section, and the negative plate comprises a third section;
the first section and the third section are respectively wound along a first direction to form a winding structure;
the outermost circle of the first section is positioned on the inner side of the outermost circle of the third section, and the second section is wound from the tail end of the first section to the second direction to cover the outermost circle of the third section;
wherein, the two sides of the third segment are coated with symmetrically distributed negative active material layers, and the surfaces of the first segment and the second segment are respectively coated with positive active material layers opposite to the negative active material layers.
2. The wound cell of claim 1, wherein one of the first and second directions is clockwise and the other is counterclockwise.
3. The wound cell of claim 1, wherein an outer sidewall of an innermost turn of the first segment is opposite to an inner sidewall of an innermost turn of the third segment;
the outer side wall of the innermost circle of the first segment is coated with the positive electrode active material layer, and the inner side wall of the innermost circle of the first segment forms a first hollow foil area.
4. The wound cell of claim 1, wherein an inner sidewall of the second segment is coated with the positive active material layer, and an outer sidewall of the second segment forms a second empty foil region.
5. The wound cell of claim 1, wherein the positive pole piece further comprises a fourth segment extending inboard from the head end of the first segment, and the negative pole piece further comprises a fifth segment extending inboard from the head end of the third segment;
the fourth section and the fifth section form a hollow foil area respectively, positive electrode lugs are arranged on the surface of the fourth section, and negative electrode lugs are arranged on the surface of the fifth section.
6. The wound battery cell according to claim 1, wherein a third empty foil area is formed on the first segment, a fourth empty foil area is formed on the third segment, a positive tab is disposed on a surface of the third empty foil area, and a negative tab is disposed on a surface of the fourth empty foil area.
7. The wound cell of claim 5 or 6, wherein the positive tab and the negative tab are arranged in a staggered manner.
8. The wound battery cell of claim 1, wherein a separator is disposed between the negative electrode sheet and the positive electrode sheet.
9. The wound cell of claim 8, wherein the membrane extends outside of the second segment.
10. A battery comprising a wound cell according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110319746.9A CN113078370A (en) | 2021-03-25 | 2021-03-25 | Winding type battery cell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110319746.9A CN113078370A (en) | 2021-03-25 | 2021-03-25 | Winding type battery cell and battery |
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| Publication Number | Publication Date |
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| CN113078370A true CN113078370A (en) | 2021-07-06 |
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| CN202110319746.9A Pending CN113078370A (en) | 2021-03-25 | 2021-03-25 | Winding type battery cell and battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258123A (en) * | 2021-06-25 | 2021-08-13 | 珠海冠宇电池股份有限公司 | Winding type battery cell and battery |
| CN114420999A (en) * | 2021-12-31 | 2022-04-29 | 东莞新能源科技有限公司 | Electrochemical device and electronic device including the same |
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| CN212517286U (en) * | 2020-07-23 | 2021-02-09 | 珠海冠宇电池股份有限公司 | Roll core, battery and electronic product |
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| JP2014167890A (en) * | 2013-02-28 | 2014-09-11 | Toshiba Corp | Battery |
| CN107546421A (en) * | 2016-06-28 | 2018-01-05 | 宁德新能源科技有限公司 | Takeup type battery core |
| CN109980230A (en) * | 2017-12-28 | 2019-07-05 | 宁德新能源科技有限公司 | Takeup type battery core and electrochemical appliance |
| CN212517286U (en) * | 2020-07-23 | 2021-02-09 | 珠海冠宇电池股份有限公司 | Roll core, battery and electronic product |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258123A (en) * | 2021-06-25 | 2021-08-13 | 珠海冠宇电池股份有限公司 | Winding type battery cell and battery |
| CN114420999A (en) * | 2021-12-31 | 2022-04-29 | 东莞新能源科技有限公司 | Electrochemical device and electronic device including the same |
| CN114420999B (en) * | 2021-12-31 | 2024-02-27 | 东莞新能源科技有限公司 | Electrochemical device and electronic device comprising same |
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