CN215008336U - Safe lithium ion battery rolls up core, lithium ion battery - Google Patents
Safe lithium ion battery rolls up core, lithium ion battery Download PDFInfo
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- CN215008336U CN215008336U CN202120653714.8U CN202120653714U CN215008336U CN 215008336 U CN215008336 U CN 215008336U CN 202120653714 U CN202120653714 U CN 202120653714U CN 215008336 U CN215008336 U CN 215008336U
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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 lithium ion batteries, in particular to a safe lithium ion battery roll core which is formed by winding a first polarity pole piece, a diaphragm and a second polarity pole piece; the winding tail end of the first polar piece is a first polar tail part single-side coated current collector; the winding tail end of the second polarity pole piece is a second polarity tail current collector; the outermost ring of the winding core is a second polarity tail current collector, and the empty foil surface of the first polarity tail single-side coated current collector faces the outer side of the winding core. The utility model discloses a roll up core structure and form the structure of similar "vest" of round through the empty foil face of first polarity afterbody single face coating mass flow body and second polarity afterbody mass flow body in electric core outer lane, the afterbody of first polarity pole piece does not contain the empty paper tinsel district that does not coat active material, has promoted the energy density of electric core, has eliminated empty paper tinsel district and has slided in rolling up the core, has corrugated and overlap the risk such as, has promoted the manufacturing goodness of electric core, reduces the safety risk in the electric core use.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery, especially, relate to a safe lithium ion battery rolls up core, lithium ion battery.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
While lithium ion batteries are now constantly pursuing high energy densities, the attendant safety issues are also a significant challenge, and many high energy density cells are at risk of failing certain safety tests, such as needle stick and weight impact safety tests. The common method for improving the needling impact is that an outer waistcoat region formed by a cathode-anode current collector which is not coated on two sides is used, when needling or heavy object impact experiments are carried out, on one hand, electric quantity and heat inside a battery cell are uniformly discharged, on the other hand, the waistcoat region is preferentially short-circuited, short-circuit points inside the battery cell are increased, short-circuit current of each short-circuit point is reduced, and therefore the safety performance of the battery is improved.
However, active substances cannot be filled in the space where the vest structure in the battery core is located, so that the battery core must lose part of energy density to ensure the safety performance of the battery, and an over-long empty foil exists at the head or tail of a pole piece of the battery core with the vest structure, and the over-long empty foil is easy to wrinkle and bend when the battery core is wound, so that the risk of short circuit of the battery core in the use process is increased, and the popularization and use of the battery core with the vest are influenced.
In view of the above, it is necessary to provide a technical solution to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model lies in: aiming at the defects of the prior art, the safety lithium ion battery roll core is provided, the defect that the energy density and the safety performance of the existing lithium ion battery cannot be considered is overcome, the processing rate of excellence of the battery core is improved, and the short circuit risk existing in the use process of the waistcoat lithium ion battery is reduced.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a safe lithium ion battery roll core is formed by winding a first polar plate, a diaphragm and a second polar plate;
the winding tail end of the first polar piece is a first polar tail part single-side coated current collector;
the winding tail end of the second polarity pole piece is a second polarity tail current collector;
the outermost ring of the winding core is the second polarity tail current collector, and the empty foil surface of the first polarity tail single-side coated current collector faces the outer side of the winding core.
As an improvement of the safety lithium ion battery roll core, at least one surface of the second polarity tail current collector is provided with an insulating layer. In the processes of pole piece stripping and cutting, the insulating layer wraps the second polarity tail current collector, so that the occurrence of hollow foil burrs and wavy edges can be reduced, the occurrence of internal short circuit caused by the fact that a diaphragm is punctured by particle foreign matters in the formation process of a finished product battery core is prevented, and the manufacturing goodness of the battery core is improved; insulating particle in the insulating layer can spread between nail and electric core contact surface when carrying out the acupuncture experiment, increases the resistance of short circuit point, promotes the throughput rate of battery acupuncture experiment, and the insulating layer can also reduce the slip of second polarity afterbody mass flow body in the diaphragm, promotes the security performance in the electric core use.
As an improvement of safe lithium ion battery roll core, first polarity afterbody single face coating mass flow body with second polarity afterbody mass flow body passes through the corresponding setting of diaphragm.
As an improvement of safe lithium ion battery roll core, the empty foil face of first polarity afterbody single face coating mass flow body still is provided with the insulating layer. In the pole piece slitting and cutting processes, the insulating layer wraps the first polarity tail part, and the single surface of the first polarity tail part is coated with the current collector, so that the generation of hollow foil burrs and wavy edges can be reduced, the occurrence of internal short circuit caused by the fact that a diaphragm is punctured by particle foreign matters in the formation process of a finished product battery core is prevented, and the manufacturing goodness of the battery core is improved; insulating particle in the insulating layer can spread between nail and electric core contact surface when carrying out the acupuncture experiment, increases the resistance of short circuit point, promotes the throughput rate of battery acupuncture experiment, and the insulating layer can also reduce the slip of first polarity afterbody single face coating mass flow body in the diaphragm, promotes the security performance in the electric core use.
As an improvement of safe lithium ion battery roll core, first polarity afterbody single face coating mass flow center on roll up core 1 circle at least. The number of the current collector coated on the single surface of the first polarity tail part is less than 1 circle, so that a waistcoat structure cannot be formed, and the current collector may contact one surface of the first polarity pole piece coated with the active substance during needling, so that the battery is ignited and exploded.
As an improvement of safe lithium ion battery roll core, second polarity afterbody mass flow center on roll up core 1 circle at least. The second polarity afterbody mass flow body's number of turns is too much, slides in the diaphragm easily, leads to the mass flow body to appear the emergence of phenomenon such as fold or folding, also can increase the thickness of book core, reduces energy density.
As an improvement of safe lithium ion battery roll core, first polarity pole piece includes first polarity head mass flow body, first polarity head single face coating mass flow body, the two-sided coating mass flow body of first active material and the first polarity afterbody single face coating mass flow body. The first polarity head current collector is welded with a first polarity tab.
As an improvement of safe lithium ion battery roll core, the coating face orientation of first polarity head single face coating mass flow body roll core outside setting.
As an improvement of safe lithium ion battery roll core, the second polarity pole piece includes second polarity head mass flow body, the two-sided coating mass flow body of second active material and the second polarity afterbody mass flow body. The second polarity header current collector is used for welding a second polarity tab.
As an improvement of the safety lithium ion battery roll core, the first polarity head single-side coating current collector with the first active material double-side coating current collector all with the second active material double-side coating current collector corresponds the setting.
The utility model discloses a second of purpose lies in: the utility model provides a lithium ion battery, including roll up the core and hold the shell of rolling up the core, roll up the core for the safe lithium ion battery of any preceding item in the description. Preferably, the outer shell is an aluminum plastic film.
Compared with the prior art, the utility model discloses following beneficial effect has at least: the utility model discloses a roll up core, the second polarity afterbody mass flow body of outer lane for not scribbling active material, the end of convoluteing of first polarity pole piece be first polarity afterbody single face coating mass flow body, and the empty foil face orientation of first polarity afterbody single face coating mass flow body roll up the core outside, the utility model discloses a roll up core structure forms the structure of similar "vest" of round in electric core outer lane through the empty foil face of first polarity afterbody single face coating mass flow body and second polarity afterbody mass flow body, promotes the passing rate of battery at tests such as acupuncture and heavy object impact through the structure of class "vest". Compared with the existing electric core with the vest structure, the tail part of the first polar piece does not contain an empty foil area without coating active substances, so that the energy density of the electric core is improved, the risks of sliding, wrinkling, overlapping and the like of the empty foil area in a winding core are eliminated, the manufacturing goodness of the electric core is improved, and the safety risk in the use process of the electric core is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a first polar plate of a winding core of a safety lithium ion battery in example 1.
Fig. 2 is a schematic diagram of the structure of the second pole piece of the winding core of the safety lithium ion battery in example 1.
Fig. 3 is a schematic view of the overall structure of the winding core of the safety lithium ion battery in embodiment 1.
Fig. 4 is a schematic structural diagram of the first polar plate of the winding core of the safety lithium ion battery in embodiment 2.
Fig. 5 is a schematic diagram of the structure of the second pole piece of the winding core of the safety lithium ion battery in example 2.
Fig. 6 is a schematic view of the entire structure of the winding core of the safety lithium ion battery in embodiment 2.
Wherein: 1-a first polar piece, 11-a first polar head current collector, 12-a first polar head single-side coated current collector, 13-a first active material double-side coated current collector, and 14-a first polar tail single-side coated current collector;
2-a separator;
3-a second polarity pole piece, 31-a second polarity head current collector, 32-a second active material double-side coated current collector, and 33-a second polarity tail current collector;
4-an insulating layer.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; 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 invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
Example 1
As shown in fig. 1 to 3, the present embodiment provides a winding core for a safety lithium ion battery, which is formed by winding a first polar plate 1, a diaphragm 2 and a second polar plate 3;
the winding tail end of the first polar piece 1 is a first polar tail part, and a current collector 14 is coated on one side;
the winding tail end of the second polarity pole piece 3 is a second polarity tail current collector 33;
the outermost ring of the winding core is a second polarity tail current collector 33, and the empty foil surface of the first polarity tail single-side coated current collector 14 faces the outer side of the winding core.
Further, the first polarity tail single-side coated current collector 14 and the second polarity tail current collector 33 are correspondingly disposed through the separator 2.
Further, the first polarity tail single side coated current collector 14 is wrapped around the jellyroll at least 1 turn. The number of the current collector 14 coated on the single surface of the first polarity tail part is less than 1, so that a waistcoat structure cannot be formed, and the current collector may contact the surface of the first polarity pole piece 1 coated with the active material during needling, so that the battery is ignited and exploded.
Further, the second polarity trailing current collector 33 surrounds the jellyroll at least 1 turn. The second polarity tail current collector 33 has too many turns and is easy to slide in the diaphragm 2, so that the current collector has wrinkles or folds, the thickness of the winding core is increased, and the energy density is reduced.
Further, the first polar sheet 1 includes a first polar head current collector 11, a first polar head single-side coated current collector 12, a first active material double-side coated current collector 13, and a first polar tail single-side coated current collector 14. A first polarity tab is welded to the first polarity head current collector 11.
Further, the coating surface of the first polar head single-side coated current collector 12 is disposed toward the outside of the jelly roll.
Further, the second polarity pole piece 3 includes a second polarity head current collector 31, a second active material double-coated current collector 32, and a second polarity tail current collector 33. The second polarity header current collector 31 is used to weld the second polarity tab.
Further, the first polar head single-sided coated current collector 12 and the first active material double-sided coated current collector 13 are both disposed corresponding to the second active material double-sided coated current collector 32.
Example 2
As shown in fig. 4 to 6, the present embodiment provides a winding core for a safety lithium ion battery, which is different from embodiment 1 in that:
the second polarity tail current collector 33 is also provided with an insulating layer 4 on both surfaces. In the pole piece slitting and cutting processes, the insulating layer 4 wraps the second polarity tail current collector 33, so that the generation of hollow foil burrs and wavy edges can be reduced, the occurrence of internal short circuit caused by the fact that particle foreign matters puncture the diaphragm 2 in the finished product battery core formation process is prevented, and the battery core manufacturing goodness is improved; insulating particle in insulating layer 4 can spread between nail and electric core contact surface when carrying out the acupuncture experiment, increases the resistance of short circuit point, promotes the throughput of battery acupuncture experiment, and insulating layer 4 can also reduce the slip of second polarity afterbody mass flow body 33 in diaphragm 2, promotes the security performance in the electric core use.
Further, the insulating layer 4 is further arranged on the empty foil surface of the first polarity tail portion single-side coated current collector 14. In the pole piece slitting and cutting processes, the insulating layer 4 wraps the first polarity tail part, and the current collector 14 is coated on the single surface of the first polarity tail part, so that the generation of hollow foil burrs and wavy edges can be reduced, the occurrence of internal short circuit caused by the fact that particle foreign matters puncture the diaphragm 2 in the finished product battery core formation process is prevented, and the manufacturing goodness of the battery core is improved; insulating particle in insulating layer 4 can spread between nail and electric core contact surface when carrying out the acupuncture experiment, increases the resistance of short circuit point, promotes the throughput of battery acupuncture experiment, and insulating layer 4 can also reduce the slip of first polarity afterbody single face coating mass flow body 14 in diaphragm 2, promotes the security performance in the electric core use.
The rest is the same as embodiment 1, and the description is omitted here.
To sum up, the utility model discloses a roll up core, outermost lane for not scribbling active material's second polarity afterbody mass flow body 33, the end of coiling of first polarity pole piece 1 is first polarity afterbody single face coating mass flow body 14, and the empty foil face orientation of first polarity afterbody single face coating mass flow body 14 rolls up the core outside, the utility model discloses a roll up core structure forms the structure of round similarity "vest" through the empty foil face of first polarity afterbody single face coating mass flow body 14 and second polarity afterbody mass flow body 33 in electric core outer lane, promotes the battery through the structure of class "vest" in the throughput of tests such as acupuncture and heavy object impact. Compared with the existing electric core with a vest structure, the tail part of the first polar plate 1 does not contain an empty foil area without coating active substances, so that the energy density of the electric core is improved, the risks of sliding, wrinkling, overlapping and the like of the empty foil area in a winding core are eliminated, the manufacturing goodness of the electric core is improved, and the safety risk in the use process of the electric core is reduced.
Example 3
This embodiment provides a safe lithium ion battery, including rolling up the core and holding the shell of rolling up the core, roll up the core and be any one of embodiment 1 ~ 2 safe lithium ion battery roll core. Preferably, the housing may be provided as an aluminum plastic film.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A safe lithium ion battery roll core is characterized in that the roll core is formed by winding a first polar plate, a diaphragm and a second polar plate;
the winding tail end of the first polar piece is a first polar tail part single-side coated current collector;
the winding tail end of the second polarity pole piece is a second polarity tail current collector;
the outermost ring of the winding core is the second polarity tail current collector, and the empty foil surface of the first polarity tail single-side coated current collector faces the outer side of the winding core.
2. The safety lithium ion battery jelly roll of claim 1, wherein at least one surface of the second polarity tail current collector is further provided with an insulating layer.
3. The safety lithium ion battery jelly roll of claim 1, wherein the first polarity tail single-sided coated current collector and the second polarity tail current collector are disposed in correspondence with each other through the separator.
4. The safety lithium ion battery roll core according to claim 1, wherein the empty foil surface of the first polarity tail single-side coated current collector is further provided with an insulating layer.
5. The safety lithium ion battery jelly roll of claim 1, wherein the first polarity tail single side coated current collector surrounds the jelly roll at least 1 turn and the second polarity tail current collector surrounds the jelly roll at least 1 turn.
6. The safety lithium ion battery jelly roll of claim 1, wherein the first polarity sheet comprises a first polarity header current collector, a first polarity header single-sided coated current collector, a first active material double-sided coated current collector, and a first polarity tail single-sided coated current collector.
7. The safety lithium ion battery jelly roll of claim 6, wherein the coated side of the first polarity head single-side coated current collector is disposed toward the outside of the jelly roll.
8. The safety lithium ion battery jelly roll of claim 6, wherein the second polarity pole piece comprises a second polarity head current collector, a second active material double coated current collector, and a second polarity tail current collector.
9. The safety lithium ion battery jelly roll of claim 8, wherein the first polar head single-sided coated current collector and the first active material double-sided coated current collector are both disposed in correspondence with the second active material double-sided coated current collector.
10. A lithium ion battery is characterized by comprising a winding core and a shell containing the winding core, wherein the winding core is the winding core of the safety lithium ion battery in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120653714.8U CN215008336U (en) | 2021-03-31 | 2021-03-31 | Safe lithium ion battery rolls up core, lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120653714.8U CN215008336U (en) | 2021-03-31 | 2021-03-31 | Safe lithium ion battery rolls up core, lithium ion battery |
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| CN215008336U true CN215008336U (en) | 2021-12-03 |
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| CN202120653714.8U Active CN215008336U (en) | 2021-03-31 | 2021-03-31 | Safe lithium ion battery rolls up core, lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447266A (en) * | 2021-12-16 | 2022-05-06 | 上海兰钧新能源科技有限公司 | Pole piece, roll up core and battery |
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2021
- 2021-03-31 CN CN202120653714.8U patent/CN215008336U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447266A (en) * | 2021-12-16 | 2022-05-06 | 上海兰钧新能源科技有限公司 | Pole piece, roll up core and battery |
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