CN203085696U - Lithium-ion battery - Google Patents
Lithium-ion battery Download PDFInfo
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- CN203085696U CN203085696U CN2012207202246U CN201220720224U CN203085696U CN 203085696 U CN203085696 U CN 203085696U CN 2012207202246 U CN2012207202246 U CN 2012207202246U CN 201220720224 U CN201220720224 U CN 201220720224U CN 203085696 U CN203085696 U CN 203085696U
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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 lithium-ion battery. The lithium-ion battery comprises a shell, cover plates, an electrolyte and pole cores, wherein a first pole tab and a second pole tab are led out of the pole cores; two short-circuit protection components are connected to the pole cores, and each short-circuit protection component comprises a conductive layer located at the middle and two insulating layers located at the two sides of the conductive layer; and one end of the conductive layer of one short-circuit protection component is electrically connected with the first pole tab of the pole cores, and one end of the conductive layer of the other short-circuit protection component is electrically connected with the second pole tab of the pole cores. According to the lithium-ion battery provided by the utility model, through arranging the short-circuit protection components on the pole cores inside the battery, when the battery is subjected to abnormal deformation due to an external force, complicated short-circuit conditions inside the battery can be actively converted into large-area short circuit between positive/negative current collectors, the heat caused by the short circuit inside the battery is minimized, meanwhile, the heat conduction path can be shortened, and the heat dissipating time of the battery is increased while the heat production rate of the battery is decelerated, so that the safety and reliability of the battery under harsh service conditions are improved.
Description
Technical field
The utility model belongs to field of batteries, relates in particular to a kind of lithium ion battery.
Background technology
Day by day exhausted in non-renewable resources such as oil, under the serious all the more background of environmental pollution, people express very big expectation to new-energy automobile.Electrokinetic cell then is the heart of new-energy automobile, is subjected to increasing the attention and favor.But in the use of battery, always there are various uncontrollable, exceedingly odious service conditions to cause inside battery to be short-circuited, produce a large amount of heats, the fail safe of battery, reliability are reduced greatly.
In the prior art, for preventing internal short-circuit of battery, generally be by employing insulating barrier or insulating material battery to be carried out insulation protection, but this protective ratio is fainter at present, battery is out of shape under unusual external force effect, the situation of internal short-circuit still can occur.Therefore how guaranteeing that it also is safe and reliable that battery uses under the condition of extreme abuse, is one of great difficult problem of being run into of electric automobile security reliability.
Summary of the invention
The utility model has solved that battery in the prior art under abominable service condition internal short-circuit takes place and technical problem that fail safe, reliability are reduced greatly, and proposes a kind of lithium ion battery with new structure.
Particularly, the technical solution of the utility model is:
A kind of lithium ion battery, comprise shell, be used for the cover plate of can and be positioned at shell and the electrolyte of cavity that cover plate surrounds and and a plurality of pole piece, be takeup type structure and/or laminated structure between a plurality of pole pieces, lead to first lug and second lug on each pole piece respectively;
Be connected with two identical short-circuit protection assemblies of stacked placement and structure on the pole piece, described short-circuit protection assembly is a three-decker, comprises conductive layer and the insulating barrier that lays respectively at the conductive layer both sides in the middle of being positioned at; One end of the conductive layer of one of them short-circuit protection assembly is electrically connected with first lug of this pole piece, and the other end is a free end; One end of the conductive layer of another short-circuit protection assembly is electrically connected with second lug of this pole piece, and the other end is a free end.
Utility model is as further improvement of the utility model, and the number of described pole piece is more than two, is connected with two short-circuit protection assemblies on each pole piece respectively; Described short-circuit protection assembly is arranged between shell and the pole piece and/or between two adjacent pole pieces.
As further improvement of the utility model, described conductive layer is a metal level.
As further improvement of the utility model, described insulating barrier is ceramic insulating material layer, coating insulation material layer or plastic insulation material layer.
As further improvement of the utility model, described insulating barrier is the battery diaphragm material layer.
As further improvement of the utility model, described first lug, second lug are drawn respectively from the two ends of pole piece.
As further improvement of the utility model, described first lug, second lug are drawn respectively from the same end of pole piece.
The lithium ion battery that utility model the utility model provides; by on the pole piece of inside battery, be provided with two respectively with positive pole ear; the short-circuit protection assembly that negative lug is electrically connected; battery is when being subjected to external force generation abnormal deformation; can initiatively make internal short-circuit of battery; and the complicated short-circuit conditions that makes pole piece inside just is being converted into/is bearing the large tracts of land short circuit between the collector; can make the internal short-circuit of battery heat be reduced to minimum; while energy shortening heat conducting path; promptly in the battery heat production speed that slows down, also increase the heat radiation time of battery, thereby increase fail safe and the reliability of battery under abominable service condition.And the lithium ion battery that the utility model provides when normal the use, can be accelerated the battery heat radiation, helps the inside battery heat balance.
Description of drawings
Fig. 1 is the structural representation of the inside lithium ion cell that provides of the utility model.
Fig. 2 is first state diagram of lithium ion battery under abominable service condition that the utility model provides.
Fig. 3 is second state diagram of lithium ion battery under abominable service condition that the utility model provides.
Among the figure; 1---shell, 2---anodal short-circuit protection assembly, 21---the conductive layer of anodal short-circuit protection assembly 2; 22---the insulating barrier of anodal short-circuit protection assembly; 3---negative pole short-circuit protection assembly, 31---the conductive layer of negative pole short-circuit protection assembly, 32---the insulating barrier of negative pole short-circuit protection assembly; 4---pole piece A; 41---the positive pole ear of pole piece A4,42---the negative lug of pole piece A4,5---pole piece B; 51---the positive pole ear of pole piece B5; 52---the negative lug of pole piece B5,6---pole piece C, 61---the positive pole ear of pole piece C6; 62---the negative lug of pole piece C6; 7---the negative pole cover plate, 8---anodal cover plate, 9---unusual foreign object.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As previously mentioned, in the utility model, be provided with several pole pieces in the described lithium ion battery, can be takeup type structure and/or laminated structure between a plurality of pole pieces, the utility model does not have particular provisions.Drawing of lug can also can be drawn respectively at two ends at same end on the pole piece.In addition, the positive and negative polarity for first lug of drawing on the pole piece, second lug does not have particular determination.Can first lug be anodal for example, second lug be a negative pole; Can first lug be negative pole also, second lug be anodal.
Below, with draw lug on pole piece A, the B, C and each pole piece that are provided with 3 laminated structures in the battery respectively from two ends, wherein first lug is that positive pole, second lug are that negative pole is an example, the lithium ion battery that the utility model is provided is specifically addressed.
A kind of lithium ion battery, its internal structure as shown in Figure 1, the electrolyte and and 3 pole piece A, B, the C that comprise shell 1, be used for the cover plate (anodal cover plate 8 and negative pole cover plate 9 shown in Fig. 1) of can 1 and be positioned at shell 1 and cavity that cover plate surrounds.In the utility model, described shell 1 can adopt metal shell, also can adopt other various external conductive casings.
Lead to positive pole ear and the negative lug (positive pole ear 41 that specifically comprises pole piece A4 respectively from two ends on 3 pole piece A, B, the C, the negative lug 42 of pole piece A4, the positive pole ear 51 of pole piece B5, the negative lug 52 of pole piece B5, the positive pole ear 61 of pole piece C6, the negative lug 62 of pole piece C6).
As shown in Figure 1, all be connected with two identical short-circuit protection assemblies of stacked placement and structure separately on 3 pole piece A, B, the C.Wherein last two the short-circuit protection assemblies that connect of pole piece A4 are arranged between shell 1 and the pole piece A4; and the short-circuit protection assembly that pole piece B5 upward connects is arranged between pole piece A4 and the pole piece B5, and pole piece C6 goes up the short-circuit protection assembly that connects and is arranged between pole piece C6 and the shell 1.
In the utility model, the structure that is connected in the short-circuit protection assembly on each pole piece is all identical, specifically comprises three-decker, comprises conductive layer and the insulating barrier that lays respectively at the conductive layer both sides in the middle of being positioned at.If the intermediate conductive layer of this short-circuit protection assembly is electrically connected with the positive pole ear of pole piece, then this short-circuit protection assembly is anodal short-circuit protection assembly.Accordingly, if the intermediate conductive layer of short-circuit protection assembly is electrically connected with the negative lug lug of pole piece, then this short-circuit protection assembly is a negative pole short-circuit protection assembly.All be connected with two identical short-circuit protection assemblies of stacked placement and structure on each pole piece, one of them is anodal short-circuit protection assembly, and another is a negative pole short-circuit protection assembly.
Therefore, in the present embodiment, pole piece A4 goes up two short-circuit protection assemblies that connect, and the intermediate conductive layer of one of them short-circuit protection assembly is electrically connected with the positive pole ear 41 of pole piece A4, and promptly this short-circuit protection assembly is anodal short-circuit protection assembly 2.The intermediate conductive layer of another short-circuit protection assembly is electrically connected with the negative lug 42 of pole piece A4, and it is a negative pole short-circuit protection assembly 3.Anodal short-circuit protection assembly 2 and the 3 stacked placements of negative pole short-circuit protection assembly, and all be arranged between pole piece A4 and the shell 1.One end of the conductive layer 21 of this positive pole short-circuit protection assembly 2 is electrically connected with the positive pole ear 41 of pole piece A4, and promptly an end of this conductive layer 21 is electrically connected with the plus plate current-collecting body of pole piece A4, and its other end is a free end.One end of the conductive layer 31 of this negative pole short-circuit protection assembly 3 is electrically connected with the negative lug 42 of pole piece A4, and promptly an end of this conductive layer 31 is electrically connected with the negative current collector of pole piece A4, and its other end is a free end.
Accordingly, pole piece B5 goes up two short-circuit protection assemblies that connect, and the intermediate conductive layer of one of them short-circuit protection assembly is electrically connected with the positive pole ear 51 of pole piece B5, and promptly this short-circuit protection assembly is anodal short-circuit protection assembly 2.The intermediate conductive layer of another short-circuit protection assembly is electrically connected with the negative lug 52 of pole piece B5, and it is a negative pole short-circuit protection assembly 3.Anodal short-circuit protection assembly 2 and the 3 stacked placements of negative pole short-circuit protection assembly, and all be arranged between pole piece A4 and the pole piece B5.One end of the conductive layer 21 of this positive pole short-circuit protection assembly 2 is electrically connected with the positive pole ear 51 of pole piece B5, and promptly an end of this conductive layer 21 is electrically connected with the plus plate current-collecting body of pole piece B5, and its other end is a free end.One end of the conductive layer 31 of this negative pole short-circuit protection assembly 3 is electrically connected with the negative lug 52 of pole piece B5, and promptly an end of this conductive layer 31 is electrically connected with the negative current collector of pole piece B5, and its other end is a free end.
Pole piece C6 goes up two short-circuit protection assemblies that connect, and the intermediate conductive layer of one of them short-circuit protection assembly is electrically connected with the positive pole ear 61 of pole piece C6, and promptly this short-circuit protection assembly is anodal short-circuit protection assembly 2.The intermediate conductive layer of another short-circuit protection assembly is electrically connected with the negative lug 62 of pole piece C6, and it is a negative pole short-circuit protection assembly 3.Anodal short-circuit protection assembly 2 and the 3 stacked placements of negative pole short-circuit protection assembly, and all be arranged between pole piece C6 and the shell 1.One end of the conductive layer 21 of this positive pole short-circuit protection assembly 2 is electrically connected with the positive pole ear 61 of pole piece C6, and promptly an end of this conductive layer 21 is electrically connected with the plus plate current-collecting body of pole piece C6, and its other end is a free end.One end of the conductive layer 31 of this negative pole short-circuit protection assembly 3 is electrically connected with the negative lug 62 of pole piece C6, and promptly an end of this conductive layer 31 is electrically connected with the negative current collector of pole piece C6, and its other end is a free end.
In the utility model, the conductive layer in the short-circuit protection assembly is preferably the various metal levels of heat conductivility excellence.Under the preferable case, the conductive layer in the described short-circuit protection assembly preferably adopts the metal with the identical material of its lug that is connected (being collector), for example can adopt metal copper layer or metal aluminium lamination, but be not limited to this.Described insulating barrier is various ceramic insulating material layers, coating insulation material layer or plastic insulation material layer, the preferred lower material of heat distortion temperature.As a kind of preferred implementation of the present utility model, the insulating barrier of described short-circuit protection assembly also can directly adopt the diaphragm material in the existing battery.More preferably under the situation, the insulating barrier in the short-circuit protection assembly between conductive layer and the pole piece can directly adopt the membrane layer of pole piece periphery to replace.
Utility model people of the present utility model finds, when being in exceedingly odious situations such as serious bump, extruding when battery, the short-circuit conditions of pole piece inside is very complicated, specifically comprise various short circuit modes such as short circuit between short circuit between short circuit between short circuit between plus plate current-collecting body and the negative material, negative current collector and the positive electrode, positive electrode and the negative material, plus plate current-collecting body and the negative current collector, and the heat production rate of different short circuit modes is diverse.Utility model people finds, under the same terms, the quantity of heat production of short circuit is maximum between positive electrode and the negative material, and the quantity of heat production minimum of short circuit between plus plate current-collecting body and the negative current collector, the former quantity of heat production is about 10 times of latter's quantity of heat production, and heat production speed also is 2 ~ 3 times of the latter.And the utility model is to the improvement of inside battery structure, just be based on above-mentioned discovery, make battery when being subjected to external force deformation, the complicated short-circuit conditions of inside battery is converted into: realize the short circuit between plus plate current-collecting body and the negative current collector at first, this moment battery quantity of heat production and heat production speed minimum, thereby improve the fail safe and the reliability of battery.
Particularly, the operation principle of the lithium ion battery that provides of the utility model is:
(1) during this lithium ion battery operate as normal; be connected with the short-circuit protection assembly separately on inside battery each pole piece A, B, the C; be provided with the conductive layer of heat conductivility excellence in this short-circuit protection assembly; make the inside battery heat dissipation path be: the insulating barrier-shell of the conductive layer of collector-short-circuit protection assembly-short-circuit protection assembly; thermally conductive pathways shortens greatly on the one hand; the thermal resistance of this thermally conductive pathways is very little on the other hand; make battery heat conductivility be improved significantly; can accelerate the battery heat radiation; and help the inside battery heat balance, prevent that the battery local temperature is too high.
(2) this lithium ion battery abnormal work is (for example shown in Figure 2; when being subjected to the extruding of unusual foreign object 9); under the effect of heat and external force; the dielectric layers up and down 22 of the anodal short-circuit protection assembly 2 between shell 1 and the pole piece A4; and the dielectric layers up and down 32 of negative pole short-circuit protection assembly 3 is destroyed rapidly; make the conductive layer 21 of anodal short-circuit protection assembly 2; the very first time contact conducting that deforms of the middle part of the conductive layer 31 of negative pole short-circuit protection assembly 3; and these two conductive layers respectively with the plus plate current-collecting body of pole piece A4; negative current collector is electrically connected; thereby realize at first pole piece A4 inside just/short circuit between the negative collector; the quantity of heat production minimum of this kind short-circuit conditions; it almost is 1/10 ~ 1/3 of complex internal short circuit heat; the speed of heat production simultaneously is also relatively low; can increase the heat radiation time of battery, the heat when unusual reduces with battery once more.By this moment just/short circuit between the negative collector, after the most of energy consumption of inside battery fallen, battery just can change inner other the various complicated short-circuit conditions of pole piece over to, but be consumed owing to the energy content of battery major part this moment, therefore the heat of other short-circuit conditions generation is also less, thereby can reduce the risk that battery is overheated, on fire, explode to greatest extent.
In addition; the conductive layer 21 in the anodal short-circuit protection assembly 2 and the conducting state of the conductive layer 31 in the negative pole short-circuit protection assembly 3 can continue the end time; as shown in Figure 3; and because the other end of these two conductive layers is free end; perk takes place when therefore this free end can go deep into inside battery along with unusual foreign object 9; eventual failure; be that this fracture process needs certain hour; make the short-circuit condition certain time of this kind of inside battery situation; consume the energy of most of battery, the security performance of battery is provided greatly.
Simultaneously, the short path principle of the short-circuit protection assembly on other pole piece (for example pole piece B5, pole piece C6) is also similar, repeats no more herein.
Further go deep into inside battery along with unusual foreign object 9; as shown in Figure 3; finally can cause the intermediate conductive layer 21 of the anodal short-circuit protection assembly 2 on battery case 1 and the pole piece A4 to contact and conducting; this moment, the heat dissipation path of inside battery was: the conductive layer-shell of the conductive layer of collector-anodal short-circuit protection assembly-negative pole short-circuit protection assembly; heat dissipation path further shortens; and be the good material of heat conductivility in this heat dissipation path; internal heat dissipating is faster when making battery unusual, thereby further increases the security performance of battery under exceedingly odious service condition.
To sum up; the lithium ion battery that the utility model provides; by on the pole piece of inside battery, be provided with two respectively with positive pole ear; the short-circuit protection assembly that negative lug is electrically connected; battery is when being subjected to external force generation abnormal deformation; can initiatively make internal short-circuit of battery; and the complicated short-circuit conditions that makes pole piece inside just is being converted into/is bearing the large tracts of land short circuit between the collector; can make the internal short-circuit of battery heat be reduced to minimum; while energy shortening heat conducting path; promptly in the battery heat production speed that slows down, also increase the heat radiation time of battery, thereby increase fail safe and the reliability of battery under abominable service condition.And the lithium ion battery that the utility model provides when normal the use, can be accelerated the battery heat radiation, helps the inside battery heat balance.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. lithium ion battery, it is characterized in that, comprise shell, be used for the cover plate of can and be positioned at shell and the electrolyte of cavity that cover plate surrounds and and a plurality of pole piece, be takeup type structure and/or laminated structure between a plurality of pole pieces, lead to first lug and second lug on each pole piece respectively;
Be connected with two identical short-circuit protection assemblies of stacked placement and structure on the pole piece, described short-circuit protection assembly is a three-decker, comprises conductive layer and the insulating barrier that lays respectively at the conductive layer both sides in the middle of being positioned at; One end of the conductive layer of one of them short-circuit protection assembly is electrically connected with first lug of this pole piece, and the other end is a free end; One end of the conductive layer of another short-circuit protection assembly is electrically connected with second lug of this pole piece, and the other end is a free end.
2. lithium ion battery according to claim 1 is characterized in that, the number of described pole piece is more than two, is connected with two short-circuit protection assemblies on each pole piece respectively; Described short-circuit protection assembly is arranged between shell and the pole piece and/or between two adjacent pole pieces.
3. according to claim 1 or 2 each described lithium ion batteries, it is characterized in that described conductive layer is a metal level.
4. according to claim 1 or 2 each described lithium ion batteries, it is characterized in that described insulating barrier is ceramic insulating material layer, coating insulation material layer or plastic insulation material layer.
5. lithium ion battery according to claim 4 is characterized in that, described insulating barrier is the battery diaphragm material layer.
6. according to claim 1 or 2 each described lithium ion batteries, it is characterized in that described first lug, second lug are drawn respectively from the two ends of pole piece.
7. according to claim 1 or 2 each described lithium ion batteries, it is characterized in that described first lug, second lug are drawn respectively from the same end of pole piece.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207202246U CN203085696U (en) | 2012-12-25 | 2012-12-25 | Lithium-ion battery |
| US14/655,528 US9748552B2 (en) | 2012-12-25 | 2013-09-12 | Battery having protection components |
| EP13866928.8A EP2939294B1 (en) | 2012-12-25 | 2013-09-12 | Battery |
| PCT/CN2013/083375 WO2014101479A1 (en) | 2012-12-25 | 2013-09-12 | Battery |
| JP2015548159A JP2016506043A (en) | 2012-12-25 | 2013-09-12 | battery |
| KR1020157015311A KR101794428B1 (en) | 2012-12-25 | 2013-09-12 | Battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207202246U CN203085696U (en) | 2012-12-25 | 2012-12-25 | Lithium-ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203085696U true CN203085696U (en) | 2013-07-24 |
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ID=48831505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012207202246U Expired - Lifetime CN203085696U (en) | 2012-12-25 | 2012-12-25 | Lithium-ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203085696U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101478A1 (en) * | 2012-12-25 | 2014-07-03 | Shenzhen Byd Auto R&D Company Limited | Battery |
| WO2014101479A1 (en) * | 2012-12-25 | 2014-07-03 | Shenzhen Byd Auto R&D Company Limited | Battery |
| CN107919492A (en) * | 2016-10-10 | 2018-04-17 | 青岛市比亚迪汽车有限公司 | lithium ion battery, battery pack and electric bus |
| CN110120489A (en) * | 2018-02-06 | 2019-08-13 | 丰田自动车株式会社 | Layer-built battery |
| CN113614991A (en) * | 2021-03-31 | 2021-11-05 | 东莞新能安科技有限公司 | Battery module and electronic device using same |
-
2012
- 2012-12-25 CN CN2012207202246U patent/CN203085696U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101478A1 (en) * | 2012-12-25 | 2014-07-03 | Shenzhen Byd Auto R&D Company Limited | Battery |
| WO2014101479A1 (en) * | 2012-12-25 | 2014-07-03 | Shenzhen Byd Auto R&D Company Limited | Battery |
| US9748552B2 (en) | 2012-12-25 | 2017-08-29 | Byd Company Limited | Battery having protection components |
| US9941505B2 (en) | 2012-12-25 | 2018-04-10 | Byd Company Limited | Battery |
| CN107919492A (en) * | 2016-10-10 | 2018-04-17 | 青岛市比亚迪汽车有限公司 | lithium ion battery, battery pack and electric bus |
| CN107919492B (en) * | 2016-10-10 | 2019-11-12 | 青岛市比亚迪汽车有限公司 | Lithium ion battery, battery pack and electric bus |
| CN110120489A (en) * | 2018-02-06 | 2019-08-13 | 丰田自动车株式会社 | Layer-built battery |
| CN113614991A (en) * | 2021-03-31 | 2021-11-05 | 东莞新能安科技有限公司 | Battery module and electronic device using same |
| WO2022205226A1 (en) * | 2021-03-31 | 2022-10-06 | 东莞新能安科技有限公司 | Battery module and electronic device applying same |
| CN113614991B (en) * | 2021-03-31 | 2023-03-07 | 东莞新能安科技有限公司 | Battery module and electronic device using same |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130724 |