CN204696190U - Pole piece and the battery of cylindrical lithium ion battery fail safe can be improved - Google Patents
Pole piece and the battery of cylindrical lithium ion battery fail safe can be improved Download PDFInfo
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- CN204696190U CN204696190U CN201420868544.5U CN201420868544U CN204696190U CN 204696190 U CN204696190 U CN 204696190U CN 201420868544 U CN201420868544 U CN 201420868544U CN 204696190 U CN204696190 U CN 204696190U
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- applying area
- pole piece
- metal forming
- battery core
- battery
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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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Abstract
The utility model provides a kind of pole piece and the battery that can improve cylindrical lithium ion battery fail safe, solve pole piece of the prior art because of intense reaction during internal short-circuit, cause the problem of poor stability, described pole piece comprises: metal forming and the first applying area being coated with polar material, second applying area, first applying area is positioned at the upper surface of metal forming, second applying area is positioned at the lower surface of metal forming, first applying area is corresponding with the second applying area, metal forming comprises the blank metal paper tinsel that the afterbody along the first applying area extends, the length of blank metal paper tinsel is greater than or equal to the outer circumference of the battery core that pole piece is formed when reeling.Pole piece of the present utility model can discharge a lot of energy contents of battery when carrying out acupuncture experiment, effectively improves the fail safe of cylindrical lithium ion battery, and structure is simple, and cost is low, safe and reliable.
Description
Technical field
The utility model relates to lithium ion battery structure field, refers to a kind of pole piece and the battery that can improve cylindrical lithium ion battery fail safe especially.
Background technology
Lithium ion battery, because have high-energy-density, long circulation life, the advantage such as safe and reliable, obtains develop rapidly in recent years.Existing lithium battery mainly contains cylindrical, the structure type such as Soft Roll, aluminum hull, and wherein cylindrical battery is the battery be most widely used.
Fig. 1 is the structural representation of pole piece in prior art, as shown in Figure 1, the pole piece of lithium ion battery comprises and is coated on the double-edged active material coating layer of metal forming 2, form positive plate or negative plate respectively by coating positive and negative pole material, the head of metal forming 2 is provided with the white space for spot welding lug.
But, because cylindrical battery inner space is little, not easily discharge the gas that intense reaction produces, poor stability, although outer cover intensity is very high, once blast, power is also very huge, there is certain potential safety hazard, and the fail safe therefore how strengthening cylindrical lithium ion battery is a world-famous puzzle.
Utility model content
For the deficiencies in the prior art, the utility model proposes a kind of pole piece and the battery that can improve cylindrical lithium ion battery fail safe, structure is simple, and cost is low, safe and reliable.
First aspect, the utility model proposes a kind of pole piece that can improve cylindrical lithium ion battery fail safe, comprise: metal forming and the first applying area being coated with polar material, second applying area, described first applying area is positioned at the upper surface of described metal forming, described second applying area is positioned at the lower surface of described metal forming, described first applying area is corresponding with described second applying area, described metal forming comprises the blank metal paper tinsel that the afterbody along described first applying area extends, the length of described blank metal paper tinsel is greater than or equal to the outer circumference of the battery core that pole piece is formed when reeling,
Also comprise the head blank metal paper tinsel for spot welding lug that the head along described first applying area extends, positive pole ear is located at the blank aluminium foil place of head, and the length of the blank aluminium foil of head is more than or equal to the girth of the volume pin for the positive/negative plate that reels.
Preferably, described metal forming is aluminium foil, and described first applying area and described second applying area are the applying area scribbling positive electrode.
Preferably, described metal forming is Copper Foil, and described first applying area and described second applying area are the applying area scribbling negative material.
Second aspect, the utility model proposes a kind of cylindrical lithium ion battery, comprising:
The packaging body of battery core and the described battery core of encapsulation;
Described battery core comprises: positive plate, negative plate and the barrier film between described positive plate and described negative plate, and the outer surface of described battery core is coated with metal forming;
Described positive plate is above-mentioned pole piece;
Described negative plate is above-mentioned pole piece;
Described battery core also comprises volume pin rest area.
Preferably, described battery core is described positive plate and the rear battery core formed of described negative plate winding.
Preferably, the head of described positive plate arranges the blank aluminium foil of head, and the blank aluminium foil of described head is provided with positive pole ear.
Preferably, the length of the blank aluminium foil of described head is more than or equal to the girth of the volume pin for the positive/negative plate that reels.
Pole piece of the present utility model reserves longer blank metal paper tinsel at afterbody, can encase more than at least one circle of battery core when reeling.Like this, by battery when safety test, metal forming is punctured pin and is communicated with, and forms external discharge, and the internal short-circuit occurred when making usually to test becomes external short circuit, effectively can improve the security feature of cylindrical lithium ion battery.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the profile of pole piece in prior art;
Fig. 2 is the profile of the pole piece of the utility model embodiment;
Fig. 3 be the utility model be suitable for the structural representation of cylindrical lithium ion battery;
Reference numeral:
1, the first applying area; 2, metal forming; 3, pin rest area is rolled up; 4, negative plate; 5, positive plate; 6, barrier film; 7, positive pole aluminium foil; 8, negative copper foil.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment; technical scheme in the utility model embodiment is removed, intactly described; obviously; described embodiment is only the utility model part embodiment; instead of whole embodiments; based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Unless otherwise defined, technical term used herein or scientific terminology should be in field belonging to the utility model the ordinary meaning that the personage with general technical ability understands." first ", " second " that use in the utility model patent application specification and claims and similar word do not represent any order, quantity or importance, and are only used to distinguish different parts.Equally, the similar word such as " ", " " or " being somebody's turn to do " does not represent restricted number yet, but represents to there is at least one." to comprise " or the similar word such as " comprising " means to occur that element before this word or object contain the element or object that appear at this word presented hereinafter and equivalent, and do not get rid of other elements or object." on ", D score, etc. only for representing relative position relation, when be described object absolute position change after, then this relative position relation also may correspondingly change." connection " is not limited to concrete type of attachment, can be direct connection, also can be indirect connection, can be non-removable connection, also can be dismountable connection, and can be electric or signal connection, also can be machinery or physical connection.
Fig. 2 shows a kind of structural representation that can improve the pole piece of cylindrical lithium ion battery fail safe of the utility model embodiment, as shown in Figure 2, described pole piece comprises: metal forming 2 and the first applying area 1 being coated with polar material, second applying area, first applying area 1 is positioned at the upper surface of metal forming 2, second applying area is positioned at the lower surface of metal forming 2, first applying area 1 is corresponding with the second applying area, metal forming 2 comprises the blank metal paper tinsel that the afterbody along the first applying area 1 extends, the length of blank metal paper tinsel is greater than or equal to the outer circumference of the battery core that pole piece is formed when reeling.
The race diameter of the battery core in the present embodiment is 16-20mm, and preferably, the race diameter of battery core is 18mm.
Pole piece in the present embodiment is divided into positive plate and negative plate, the metal forming 2 that positive plate adopts is aluminium foil, first applying area 1 and the second applying area are coated with positive electrode, aluminium foil is provided with not coated white space, for spot welding positive pole ear, the afterbody of positive plate leaves the blank aluminium foil of afterbody, and the length of the blank aluminium foil of afterbody is more than or equal to the outer circumference of battery core.
The metal forming 2 that negative plate adopts is Copper Foil, and the first applying area 1 and the second applying area are coated with negative material, and Copper Foil is provided with negative lug.
Come off for avoiding the dressing of applying area, the head of the positive plate in the present embodiment also leaves the blank aluminium foil of head, the head of negative plate also leaves the blank Copper Foil of head, positive pole ear is located at the blank aluminium foil place of head, the length of the blank aluminium foil of head is more than or equal to the girth of the volume pin for the positive/negative plate that reels, cutting in operation, directly can cut the head blank metal paper tinsel place of pole piece, thus prevent dressing from coming off.
Further, as preferably execution mode, the positive plate in the present embodiment and the length of negative plate are 750mm, and the length of afterbody blank metal paper tinsel is 56.62mm.
The material of the positive plate in the utility model, negative plate and afterbody blank metal paper tinsel and size are not limited to material that the present embodiment provides and size, and the present embodiment does not specifically limit it, can according to need of production sets itself.
The positive/negative plate of the present embodiment is provided with longer blank metal paper tinsel, more than at least one circle of battery core can be encased when reeling, cylindrical lithium ion battery is when carrying out safety test, blank metal paper tinsel on positive/negative plate is punctured pin and is communicated with, form external discharge, the internal short-circuit occurred when making usually to test becomes external short circuit, effectively can improve the security feature of cylindrical lithium ion battery.
Fig. 3 shows the structural representation of a kind of cylindrical lithium ion battery of the utility model embodiment, as shown in Figure 3, described cylindrical lithium ion battery, comprise: the packaging body of battery core and packaging electric core, described battery core comprises: positive plate 5 and negative plate 4 and the barrier film between positive plate 5 and negative plate 46, the outer surface of battery core is coated with metal forming, and metal forming comprises positive pole aluminium foil 7 and negative copper foil 8.
Wherein, the structure of positive plate 5 and negative plate 4 is as shown in Figure 2, no longer states herein.
In the present embodiment, the top layer of battery core is applying area, and positive pole aluminium foil 7 and negative copper foil 8 fit tightly on applying area, and by positive pole aluminium foil 7 and negative copper foil 8 being fitted tightly on the first applying area 1, the heat that battery core inside is produced distributes rapidly in time.
Wherein, battery core is the battery core formed after positive plate 5 and negative plate 4 reel, and in the process of winding, is placed on by negative plate 4 on barrier film 6, with barrier film 6, negative plate 4 is wrapped, the blank Copper Foil of afterbody on negative plate 4 stretches out in the side of barrier film 6, after winding, is inserted by positive plate 5 between volume pin and barrier film 6, during winding, volume pin is placed in volume pin rest area 3 place, and the blank aluminium foil of the afterbody on positive plate stretches out at the opposite side of barrier film 6, then negative plate 4, barrier film 6 and positive plate 5 is wound into battery core.
The cylindrical lithium ion battery of the present embodiment, blank metal aluminium foil is increased at the afterbody of positive plate, blank metal Copper Foil is increased at the afterbody of negative plate, in the outermost end of battery core, there is the outer ring by aluminium foil and Copper Foil parcel, when carrying out acupuncture experiment, draw point is to first aluminium foil and Copper Foil being connected together, internal short-circuit in usual test condition is become external short circuit, thus effectively improve the fail safe of cylindrical lithium ion battery, there is electrochemical reaction when making internal short-circuit of battery to discharge a large amount of heats and can distribute fast, improve battery heat dispersion, avoid occurring on fire or explosive event, significantly improve the safety and reliability of battery.
Obviously, those skilled in the art double utility model can carry out various change and modification and does not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies, then the utility model is also intended to comprise these change and modification.
Claims (5)
1. one kind can be improved the pole piece of cylindrical lithium ion battery fail safe, it is characterized in that, comprise: metal forming and the first applying area, the second applying area that are coated with polar material, described first applying area is positioned at the upper surface of described metal forming, described second applying area is positioned at the lower surface of described metal forming, described first applying area is corresponding with described second applying area, described metal forming comprises the blank metal paper tinsel that the afterbody along described first applying area extends, and the length of described blank metal paper tinsel is greater than or equal to the outer circumference of the battery core that pole piece is formed when reeling;
Also comprise the head blank metal paper tinsel for spot welding lug that the head along described first applying area extends, positive pole ear is located at the blank aluminium foil place of head, and the length of the blank aluminium foil of head is more than or equal to the girth of the volume pin for the positive/negative plate that reels.
2. the pole piece as described in as arbitrary in claim 1, it is characterized in that, described metal forming is aluminium foil, and described first applying area and described second applying area are the applying area scribbling positive electrode.
3. the pole piece as described in as arbitrary in claim 1, it is characterized in that, described metal forming is Copper Foil, and described first applying area and described second applying area are the applying area scribbling negative material.
4. a cylindrical lithium ion battery, is characterized in that, comprising: the packaging body of battery core and the described battery core of encapsulation;
Described battery core comprises positive plate, negative plate and the barrier film between described positive plate and described negative plate, and the outer surface of described battery core is coated with metal forming;
Described positive plate is pole piece according to claim 2;
Described negative plate is pole piece according to claim 3;
Described battery core also comprises volume pin rest area.
5. cylindrical lithium ion battery as claimed in claim 4, is characterized in that, described battery core is described positive plate and the rear battery core formed of described negative plate winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420868544.5U CN204696190U (en) | 2014-12-31 | 2014-12-31 | Pole piece and the battery of cylindrical lithium ion battery fail safe can be improved |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420868544.5U CN204696190U (en) | 2014-12-31 | 2014-12-31 | Pole piece and the battery of cylindrical lithium ion battery fail safe can be improved |
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| CN204696190U true CN204696190U (en) | 2015-10-07 |
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| CN201420868544.5U Active CN204696190U (en) | 2014-12-31 | 2014-12-31 | Pole piece and the battery of cylindrical lithium ion battery fail safe can be improved |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109698379A (en) * | 2018-12-27 | 2019-04-30 | 深圳市海盈科技有限公司 | It is a kind of with the core strueture and shunt method that prevent thermal runaway function |
| CN109845021A (en) * | 2016-10-27 | 2019-06-04 | 三星Sdi株式会社 | Secondary cell |
-
2014
- 2014-12-31 CN CN201420868544.5U patent/CN204696190U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109845021A (en) * | 2016-10-27 | 2019-06-04 | 三星Sdi株式会社 | Secondary cell |
| CN109845021B (en) * | 2016-10-27 | 2023-03-28 | 三星Sdi株式会社 | Secondary battery |
| CN109698379A (en) * | 2018-12-27 | 2019-04-30 | 深圳市海盈科技有限公司 | It is a kind of with the core strueture and shunt method that prevent thermal runaway function |
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