CN219371101U - Lithium ion battery winding structure and lithium ion battery - Google Patents
Lithium ion battery winding structure and lithium ion battery Download PDFInfo
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- CN219371101U CN219371101U CN202223458155.9U CN202223458155U CN219371101U CN 219371101 U CN219371101 U CN 219371101U CN 202223458155 U CN202223458155 U CN 202223458155U CN 219371101 U CN219371101 U CN 219371101U
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- pole piece
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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 utility model belongs to the technical field of battery production and manufacturing, and in particular relates to a lithium ion battery winding structure and a lithium ion battery, wherein the lithium ion battery winding structure comprises a first pole piece, a second pole piece and an isolating film, and the first pole piece, the isolating film and the second pole piece are sequentially overlapped and wound to form a winding core; the winding core has at least two corners; the two sides of the first pole piece and the second pole piece are respectively provided with a long film surface and a short film surface, and the positions of the long film surfaces of the first pole piece corresponding to the corners are coated with polymer glue. According to the utility model, by optimizing the winding corner structure, the lithium separation at the side edge of the lithium ion battery can be improved, so that the quality of the battery is improved.
Description
Technical Field
The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a lithium ion battery winding structure and a lithium ion battery.
Background
The coming of the information age and the explosion of global energy crisis, new energy fields are rapidly developing. With the development of electronics, mobile devices and electric vehicles, the requirements for batteries are increasing, and batteries with high energy density, long cycle life, high rate charging, and high safety are favored.
The existing ways of improving energy density mainly include: (1) using a high voltage positive electrode material; (2) using a high-compaction density anode material; (3) improving the coating surface density of the anode and the cathode; (4) Thinner materials are used for copper foil, aluminum foil, isolating film, aluminum plastic film and the like; (5) And compressing the difference value between the positive and negative plates and the length and width of the pit in the aluminum plastic film.
The prior structure adopts high-voltage positive electrode material or improves the coating surface density, and the CB value of the battery is possibly seriously insufficient when the energy density is improved; for the lithium ion battery of winding structure, contact failure between the pole pieces at the corner arc positions is less than the smooth area, and the contact difference between the pole pieces is insufficient together with the CB value, so that the lithium ion battery is easy to generate lithium precipitation phenomenon at the corner arc positions in the circulation process, and serious deformation and failure of the side edges of the battery are finally caused along with the occurrence of lithium precipitation aggravation side reaction, and short circuit fire is caused by the fact that lithium ion dendrites pierce through the isolating membrane.
Disclosure of Invention
One of the objects of the present utility model is: aiming at the defects in the prior art, the winding structure of the lithium ion battery is provided, and the side lithium precipitation of the lithium ion battery can be improved by optimizing the winding corner structure, so that the quality of the battery is improved.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the winding structure of the lithium ion battery comprises a first pole piece, a second pole piece and an isolating film, wherein the first pole piece, the isolating film and the second pole piece are sequentially overlapped and wound to form a winding core; the winding core has at least two corners; the two sides of the first pole piece and the second pole piece are respectively provided with a long film surface and a short film surface, and the positions of the long film surfaces of the first pole piece corresponding to the corners are coated with polymer glue.
Preferably, the polymer glue is PDVF glue solution.
Preferably, both sides of the separator are coated with ceramic and PVDF.
Preferably, the coating length of the polymer glue is equal to the width of the first pole piece.
Preferably, the coating width of the polymer glue is equal to the arc length of the long film surface of the first pole piece corresponding to the corner.
Preferably, the coating thickness of the polymer glue is 5-10 um.
Preferably, the arc length of the long film surface of the first pole piece corresponding to the corner is smaller than the arc length of the long film surface of the second pole piece corresponding to the corner, and the arc length of the short film surface of the second pole piece corresponding to the corner is smaller than the arc length of the short film surface of the first pole piece corresponding to the corner.
Preferably, the first pole piece and the second pole piece are provided with empty foil areas and coating areas on two sides, the empty foil areas of the first pole piece are welded with first pole lugs, and the empty foil areas of the second pole piece are welded with second pole lugs.
Preferably, the first pole piece is provided with a tail end, the tail end is positioned on the outermost ring of the winding core, and two sides of the tail end are empty foil areas.
The second objective of the present utility model is to provide a lithium ion battery, which comprises the above-mentioned winding structure of the lithium ion battery.
The utility model has the advantages that the polymer glue is coated on the position of the long film surface of the first pole piece, which corresponds to the corner, so that the contact between pole pieces at the corner position can be improved, namely the cohesive force between pole pieces at the arc position of the corner is improved, the contact between the pole pieces is more compact, the flatness of the battery in the formation process is also improved, the film forming effect of the SEI film on the surface of the cathode is improved, the risk of side deformation is reduced, the lithium ion transmission at the corner can be weakened, the lithium precipitation phenomenon caused by insufficient CB value of the corner is compensated, and the lithium precipitation at the corner position is avoided, thereby improving the performance of the battery.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a winding core according to the present utility model.
Fig. 2 is a schematic diagram of stacking a first pole piece, a second pole piece, and a separator according to the present utility model.
Fig. 3 is a winding schematic diagram of the first pole piece, the second pole piece and the separator of the present utility model.
Wherein reference numerals are as follows:
1-a first pole piece; 11-tail end collection;
2-a second pole piece;
3-a separation membrane;
4-winding the core; 41-corner;
5-growing a film surface;
6-short film surface;
7-polymer glue;
8-a first tab;
9-second pole ear.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The present utility model will be described in further detail with reference to fig. 1 to 3, but the present utility model is not limited thereto.
Embodiment one
Embodiment one will be described with reference to FIG. 1
The lithium ion battery winding structure comprises a first pole piece 1, a second pole piece 2 and a separation film 3, wherein the first pole piece 1, the separation film 3 and the second pole piece 2 are sequentially overlapped and wound to form a winding core 4; the winding core 4 has at least two corners 41; the two sides of the first pole piece 1 and the second pole piece 2 are respectively provided with a long film surface 5 and a short film surface 6, and the positions of the long film surface 5 of the first pole piece 1 corresponding to the corners 41 are coated with polymer glue 7.
Because contact between pole pieces at the corner arc of the lithium ion battery with a winding structure is poor, the CB value at the corner is smaller than a flattening area, the contact difference between the pole pieces and the CB value are insufficient, so that lithium precipitation phenomenon is very easy to occur at the corner arc of the lithium ion battery in the circulation process, and serious deformation and failure of the side edge of the battery are caused along with the occurrence of lithium precipitation, therefore, the polymer glue 7 is coated at the position, corresponding to the corner 41, of the long film surface 5 of the first pole piece 1, contact between pole pieces at the corner position can be improved, namely, the cohesive force between pole pieces at the corner arc is improved, the contact between the pole pieces is tighter, the flatness of the battery in the formation process is improved, the film forming effect of an SEI film on the surface of a negative electrode is improved, the risk of side edge deformation is reduced, the lithium ion transmission at the corner can be weakened, the lithium precipitation phenomenon caused by insufficient CB value at the corner is avoided, and the lithium precipitation at the corner position is avoided, so that the performance of the battery is improved.
The first pole piece 1 may be a negative pole piece, the second pole piece 2 may be a positive pole piece, and when the separator 3 is wound, the negative pole piece is wrapped by the separator 3 to be wound into a winding core 4, or the first pole piece 1 may be a positive pole piece, and the second pole piece 2 may be a negative pole piece, which is not limited herein.
In the lithium ion battery winding structure according to the utility model, the polymer glue 7 is a PDVF glue solution. In the present embodiment, the polymer glue 7 is a PDVF glue or a glue formed by mixing PVDF with an organic solvent, but the present utility model is not limited thereto, and may be any other type of polymer glue, such as NMP glue.
In the lithium ion battery winding structure according to the present utility model, both sides of the separator 3 are coated with ceramic and PVDF. Specifically, both sides of the separation film 3 are coated with ceramic and PVDF, so that the first and second electrode sheets 1 and 2 having opposite polarities are electrically separated by the separation film 3.
In the winding structure of the lithium ion battery according to the present utility model, the coating length of the polymer glue 7 is equal to the width of the first pole piece 1, and corner lithium precipitation can be avoided.
In the winding structure of the lithium ion battery, the coating width of the polymer glue 7 is equal to the arc length of the corresponding corner 41 of the long film surface 5 of the first pole piece 1, and the position where the pole piece is easy to separate lithium is fully covered.
In the winding structure of the lithium ion battery according to the utility model, the coating thickness of the polymer glue 7 is 5 um-10 um, for example, the coating thickness of the polymer glue 7 is 5um, 6um, 7um, 8um, 9um and 10um, so that the coating of the polymer glue 7 is prevented from being too thick, the whole winding core 4 is prevented from being too thick, the space utilization of the battery is not facilitated, and the whole cost of the battery is increased.
The working principle of the utility model is as follows:
the polymer glue 7 is coated at the position of the long film surface 5 of the first pole piece 1 corresponding to the corner 41, so that the contact between pole pieces at the corner position can be improved, namely, the cohesive force between pole pieces at the arc position of the corner is improved, the contact between the pole pieces is tighter, the flatness of a battery in a formation procedure is further improved, the film forming effect of an SEI film on the surface of a negative electrode is improved, the risk of side deformation is reduced, the lithium ion transmission at the corner can be weakened, the lithium precipitation phenomenon caused by insufficient CB value of the corner is compensated, the lithium precipitation at the corner position is avoided, and the performance of the battery is improved.
Second embodiment
Unlike the first embodiment, the following is: the arc length of the long film surface 5 of the first pole piece 1 corresponding to the corner 41 is smaller than the arc length of the long film surface 5 of the second pole piece 2 corresponding to the corner 41, and the arc length of the short film surface 6 of the second pole piece 2 corresponding to the corner 41 is smaller than the arc length of the short film surface 6 of the first pole piece 1 corresponding to the corner 41. Specifically, the first pole piece 1 is a negative pole piece, the second pole piece 2 is a positive pole piece, and the arc length of the long film surface 5 of the first pole piece 1 corresponding to the corner 41 is L Film for negative electrode sheet The arc length of the long film surface 5 of the second pole piece 2 corresponding to the corner 41 is L Positive plate long film The arc length of the short film surface 6 of the second pole piece 2 corresponding to the corner 41 is L Positive plate short film The arc length of the short film surface 6 of the first pole piece 1 corresponding to the corner 41 is L Negative plate short film The relation is satisfied: l (L) Negative plate short film >L Positive plate short film >L Positive plate long film >L Film for negative electrode sheet Therefore, the CB value of the long film surface of the lithium ion battery is smaller than the CB (cell balance) value of the short film surface. The CB value is calculated by the capacity of the negative electrode per unit area compared with the capacity of the positive electrode. In addition, the corner arc length calculation formula is: l (L) Arc length And (2) Di/2, wherein Di is the diameter of the corner arc of the long film surface of the ith anode sheet and is equal to the sum of the thicknesses of the positive sheet, the negative sheet and the isolating film at the corner.
Other structures are the same as those of the first embodiment, and will not be described here again.
Embodiment III
Unlike the first embodiment, the following is: the two sides of the first pole piece 1 and the second pole piece 2 of the embodiment are provided with empty foil areas and coating areas, the empty foil areas of the first pole piece 1 are welded with first pole lugs 8, the empty foil areas of the second pole piece 2 are welded with second pole lugs 9, the first pole piece 1 is provided with tail ends 11, the tail ends 11 are positioned on the outermost ring of the winding core 4, and the two sides of the tail ends 11 are all empty foil areas. Specifically, the two sides of the tail end 11 are empty foil areas, the tail end 11 is fixed on the outermost ring of the winding core 4, the tail end 11 is positioned at a corner 41 of the winding core 4, in addition, the two sides of the middle parts of the first pole piece 1 and the second pole piece 2 are empty foil areas, the middle part of the first pole piece 1 is empty foil area welded with the first pole lug 8, and the middle part of the second pole piece 2 is empty foil area welded with the second pole lug 9.
Other structures are the same as those of the first embodiment, and will not be described here again.
Lithium ion battery
The utility model comprises the lithium ion battery winding structure of the first to third embodiments.
Specifically, the battery cell comprises at least two pole pieces which are mutually overlapped and have opposite polarities, and the pole pieces with opposite polarities respectively form a positive pole piece of the battery and a negative pole piece of the battery. In order to avoid short circuit between the positive pole piece and the negative pole piece, an isolating film 3 is arranged between every two adjacent pole pieces, and pole pieces with opposite polarities are electrically isolated through the isolating film 3.
The battery cell is a winding type battery cell, wherein the first pole piece 1 and the second pole piece 2 are one, and the first pole piece 1, the isolating film 3 and the second pole piece 2 which are sequentially stacked are wound around a winding center to form a winding structure.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.
Claims (10)
1. The lithium ion battery winding structure is characterized by comprising a first pole piece (1), a second pole piece (2) and an isolating film (3), wherein the first pole piece (1), the isolating film (3) and the second pole piece (2) are sequentially overlapped and wound to form a winding core (4);
the winding core (4) has at least two corners (41);
the two sides of the first pole piece (1) and the second pole piece (2) are respectively provided with a long film surface (5) and a short film surface (6), and the positions, corresponding to the corners (41), of the long film surfaces (5) of the first pole piece (1) are coated with polymer glue (7).
2. A lithium ion battery winding structure as defined in claim 1, wherein: the polymer glue (7) is PDVF glue solution.
3. A lithium ion battery winding structure as defined in claim 1, wherein: the coating length of the polymer glue (7) is equal to the width of the first pole piece (1).
4. A lithium ion battery winding structure as defined in claim 1, wherein: the coating width of the polymer glue (7) is equal to the arc length of the long film surface (5) of the first pole piece (1) corresponding to the corner (41).
5. A lithium ion battery winding structure as defined in claim 1, wherein: the coating thickness of the polymer glue (7) is 5-10 um.
6. A lithium ion battery winding structure as defined in claim 1, wherein: the two sides of the isolating membrane (3) are coated with ceramic and PVDF.
7. A lithium ion battery winding structure as defined in claim 1, wherein: the arc length of the long film surface (5) of the first pole piece (1) corresponding to the corner (41) is smaller than that of the long film surface (5) of the second pole piece (2) corresponding to the corner (41), and the arc length of the short film surface (6) of the second pole piece (2) corresponding to the corner (41) is smaller than that of the short film surface (6) of the first pole piece (1) corresponding to the corner (41).
8. A lithium ion battery winding structure as defined in claim 1, wherein: the two sides of the first pole piece (1) and the second pole piece (2) are provided with empty foil areas and coating areas, the empty foil areas of the first pole piece (1) are welded with first pole lugs (8), and the empty foil areas of the second pole piece (2) are welded with second pole lugs (9).
9. The lithium ion battery winding structure according to claim 8, wherein: the first pole piece (1) is provided with a tail end (11), the tail end (11) is positioned on the outermost ring of the winding core (4), and two surfaces of the tail end (11) are empty foil areas.
10. A lithium ion battery, characterized in that: a winding structure comprising the lithium ion battery of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223458155.9U CN219371101U (en) | 2022-12-23 | 2022-12-23 | Lithium ion battery winding structure and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223458155.9U CN219371101U (en) | 2022-12-23 | 2022-12-23 | Lithium ion battery winding structure and lithium ion battery |
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| CN219371101U true CN219371101U (en) | 2023-07-18 |
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| CN202223458155.9U Active CN219371101U (en) | 2022-12-23 | 2022-12-23 | Lithium ion battery winding structure and lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117577960A (en) * | 2024-01-11 | 2024-02-20 | 江苏正力新能电池技术有限公司 | Electrode assembly, battery and electric equipment |
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- 2022-12-23 CN CN202223458155.9U patent/CN219371101U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117577960A (en) * | 2024-01-11 | 2024-02-20 | 江苏正力新能电池技术有限公司 | Electrode assembly, battery and electric equipment |
| CN117577960B (en) * | 2024-01-11 | 2024-04-09 | 江苏正力新能电池技术有限公司 | Electrode assembly, battery and electric equipment |
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