CN102332544A - Lithium ion battery and safety cap thereof - Google Patents
Lithium ion battery and safety cap thereof Download PDFInfo
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- CN102332544A CN102332544A CN201010624408A CN201010624408A CN102332544A CN 102332544 A CN102332544 A CN 102332544A CN 201010624408 A CN201010624408 A CN 201010624408A CN 201010624408 A CN201010624408 A CN 201010624408A CN 102332544 A CN102332544 A CN 102332544A
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- lithium ion
- ion battery
- top cover
- gland bush
- motive force
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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
Abstract
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and a safety cap thereof. The safety cap comprises a top cover with a vent hole, a composite sealing gasket, an exhausting gasket with an exhausting outlet, a metal gasket for being soldered with a positive terminal, and a hollow insulating ring, wherein the top cover, the composite sealing gasket, the exhausting gasket and the metal gasket are sequentially arranged in the hollow insulating ring; and the safety cap further comprises a sealing power source positioned between the top cover and the composite sealing gasket. The technical scheme mainly has the advantages as follows: 1, an explosion-proof valve can be repeatedly utilized, so that the situation that a traditional battery becomes useless due to the breakage of an explosion-proof sheet; 2, the traditional metal explosion-proof sheet is not needed, so that the problem of hard damage to the explosion-proof sheet caused by the pressure at a seal is solved; and 3, an assembling process is simple and is convenient for mass production.
Description
Technical field
The present invention relates to technical field of lithium ion, particularly a kind of lithium ion battery and safe cap thereof; The present invention is directed to column lithium ion battery when under hot conditions, using, the risk that its internal pressure raises and brought through improving capping structure, has been improved the stable and security performance of lithium ion battery.
Background branch art
Along with the continuous development of modern society, mobile device such as notebook computer, video camera; Move DVD and EV (electric automobile) etc. and will obtain application more and more widely; Thereby formed the wilderness demand to high-energy battery, column lithium ion battery is as 18650,26650; 14500,14430 grades have obtained using widely owing to having high-energy-density.
Because processing; Heat radiation, the reason of aspects such as sealing, column lithium ion battery mostly adopts the steel housing; But the disadvantage of steel housing is exactly when pressure is too high in reasons such as battery high-temperature storage cause; There is the potential safety hazard of blast in battery, so the inside lithium ion cell of steel housing is pressed the explosion-protection equipment of pressure release when excessive in need being installed in, and explosion-protection equipment is installed on the block usually.Have explosion-proof combination cover cap (like CN 2845183Y, CN 201069809Y) on the market now, basic structure is seen Fig. 1; This combination cover cap 5 comprises: top cover 50, positive temperature coefficient ring plate 51, explosion-proof valve 52; Be used for metallic gasket 53 and hollow dead ring 54 with the positive terminal welding; Explosion-proof valve and metallic gasket laser welding together, dead ring loads top cover, ring plate, explosion-proof valve and metallic gasket, guarantees sealing.In actual the use, when inside battery air pressure becomes big, because of the solder joint between explosion-proof valve upset and the metallic gasket can break off, battery opens circuit, and when this air pressure was bigger than normal, explosion can take place explosion-proof valve, thereby prevented battery explosion.But these combination cover caps can only be disposable uses, and after implementing the pressure release action, battery opens circuit, and can not continue discharge and use.
Column lithium ion battery is used on EV or the Large Electric field of tool; Usually be to connect and compose in parallel a battery pack by hundreds of monocells to use; When in high temperature or the lasting use of big multiplying power, will certainly cause the action of one or more monocell explosion-protection equipments, this will cause the branch circuit break at this monocell place; In addition; The branch road of branch road parallel connection will overcharge and overdischarge therewith, and this will seriously reduce the useful life and the security performance of battery pack, and it also is very difficult changing the monocell that opens circuit.
This expendable pressure relief device has not only limited the scope of application of column lithium ion battery, has reduced the useful life and the security performance of series and parallel circuit, and the waste that has brought resource.
Summary of the invention:
First purpose of the present invention is the deficiency to prior art, and a kind of safe cap that can reusable lithium ion battery is provided.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of safe cap of lithium ion battery; Comprise top cover, the composite gland bush, the exhaust gaskets that is provided with air exit that are provided with steam vent, be used for metallic gasket and hollow dead ring with the positive terminal welding; Described hollow dead ring loads top cover, composite gland bush, exhaust gaskets, metallic gasket successively, also comprises the sealed motive force source between top cover and composite gland bush.
With respect to prior art, a kind of safe cap of lithium ion battery is provided, this block has the sealed motive force source structure between top cover and composite gland bush, makes the present invention possess recoverable pressure-relief explosion-proof function.When the air pressure in the housing during greater than 2MPa, described composite gland bush is opened, beginning pressure release exhaust, when the air pressure in the housing during less than 2MPa, described composite gland bush since the effect of sealed motive force source air exit is sealed.Make battery keep sealing state, thereby reach the purpose that to recover to use.
The gravity of composite gland bush is little more a lot of than the elastic force of power source, ignores, and operation principle of the present invention will be shown below:
P
0+ F/S>=P
In
Wherein, P
0Represent external atmosphere pressure, F represents sealed motive force source elastic force, and S represents air exit area, P
InRepresent enclosure interior air pressure.In this formula, when reaching critical condition, battery container air pressure inside P
InTo reach 20 atmospheric pressure, much larger than atmospheric pressure P
0, the battery container internal gas will be discharged to the outside this moment, and the battery case internal milieu is not influenced by ambient atmosphere can.
As further improvement project of the present invention, described sealed motive force source is spring or shell fragment.They are to come the machine components of work through elasticity, and it can deformation take place because of receiving external force, and after external force was removed, it also can restPose.Among the present invention, after the battery container internal gas pressure was greater than 2MPa, spring or shell fragment can shrink; Air exit is discharged the gas that battery produces; Realize safety relief, after pressure release finished, spring or shell fragment can restPose; The sealing state that keeps original battery, the normal operation circumstances of recovery battery.
As further improvement project of the present invention, also comprise the positive temperature coefficient ring plate, described positive temperature coefficient ring plate is between exhaust gaskets and metallic gasket.When battery have big electric current through the time, or battery is under the hot environment, PTC internal resistance meeting increases, thereby the electric current through battery is diminished, heat production is just slow, makes battery safer.
As further improvement project of the present invention, upper end, described sealed motive force source is fixedly connected with top cover, and lower end, described sealed motive force source is fixedly connected with composite gland bush.The purpose that is fixedly connected is to prevent that the sealed motive force source from rocking.In the process of sealed motive force source at exhaust pressure relief, can receive deformation to take place from the gas pressure of battery, adopt to be fixedly connected to guarantee that the sealed motive force source returns to initial condition smoothly after exhaust pressure relief finishes.
As further improvement project of the present invention, described top cover is provided with connector, and upper end, described sealed motive force source is fixedly connected with connector.
As further improvement project of the present invention, described composite gland bush is made up of the upper strata of hard material and the lower floor of soft material, and lower end, described sealed motive force source is fixedly connected with the upper strata of composite gland bush.
As further improvement project of the present invention, the upper and lower of said composite gland bush all cover air exit.Bigger pressure and stressed also relatively more even can be born in the upper strata of hard material; Lower end, sealed motive force source is fixedly connected with the upper strata of composite gland bush; Bear the sealing load in sealed motive force source, the lower floor of soft material is as sealing gasket, when receiving the bigger pressure in upper strata; Deformation takes place, and makes to seal air exit better.
As further improvement project of the present invention, the sidewall of described top cover is provided with a steam vent at least.When battery under hot environment, the inner electrolyte of battery can be vaporized, and produces gas; Gas can be discharged through the venthole of baffle plate, arrives safe cap, directly arrives air exit afterwards; When air pressure during greater than 2MP; Air pressure can overcome the compacting in sealed motive force source and make composite gland bush break away from air exit, and gas arrives the steam vent of top cover smoothly, is discharged in the atmosphere.
Another object of the present invention is to provide a kind of lithium ion battery, comprise housing, be seal-installed on housing upper end block, be positioned at the battery of housing and be positioned at the baffle plate on the battery;
Described block and housing seal winding;
Described baffle plate is provided with some gas outlets;
Described block is above-mentioned safe cap.
With respect to prior art, lithium ion battery of the present invention through improving capping structure, has improved the stable and security performance of lithium ion battery
As further improvement project of the present invention, the air pressure in the described housing is during greater than 2MPa, and described composite gland bush is opened; Beginning pressure release exhaust; When the air pressure in the housing during less than 2MPa, described composite gland bush since the effect of sealed motive force source air exit is sealed.
Description of drawings:
Fig. 1 is the prior art constructions sketch map;
Fig. 2 is the structural representation of embodiment of the present invention one;
Fig. 3 is the structural representation of embodiment of the present invention two.
Embodiment:
See accompanying drawing 2; This is an execution mode one of the present invention; A kind of safe cap of lithium ion battery; Comprise top cover 10, the composite gland bush 12, the exhaust gaskets 13 that is provided with air exit 130 that are provided with steam vent 102, be used for metallic gasket 15 and hollow dead ring 16 with positive terminal 30 welding; Described hollow dead ring 16 loads top cover 10, composite gland bush 12, exhaust gaskets 13, metallic gasket 15 successively, also comprises the sealed motive force source 11 between top cover 10 and composite gland bush 12.Described sealed motive force source 11 is a spring, and described top cover 10 is provided with connector 101, and 11 upper ends, described sealed motive force source are fixedly connected with connector 101.
This execution mode also comprises positive temperature coefficient ring plate 14; Described positive temperature coefficient ring plate 14 is between exhaust gaskets 13 and metallic gasket 15; To guarantee that positive temperature coefficient ring plate 14 can not sustain damage; The endoporus of positive temperature coefficient ring plate 14 is greater than the air exit 130 of exhaust gaskets of its top, and a plurality of air exits of irresistible below metallic gasket 15, so that guarantee can barrier air.
The described composite gland bush 12 of this execution mode is made up of the upper strata 120 of hard material and the lower floor 121 of soft material, and 11 lower ends, described sealed motive force source are fixedly connected with the upper strata 120 of composite gland bush 12; The upper strata 120 and the lower floor 121 of said composite gland bush 12 all cover air exit 130.
In this execution mode, spring plays the effect in sealed motive force source 11, and it exerts pressure for composite gland bush 12, makes battery container 2 keep sealing state.After battery container 2 internal gas pressures increased, spring can shrink, beginning pressure release action, and after the pressure release release, spring also can continue to keep battery container 2 sealings.
This is an execution mode two of the present invention; See accompanying drawing 3, this structure and execution mode one difference are: described sealed motive force source 11 is shell fragment, and described top cover 10 is provided with connector 101; Described shell fragment one end is fixedly connected with connector 101; The other end is fixedly connected with the upper strata 120 of composite gland bush 12, and other is identical with execution mode one, repeats no more here.In this execution mode, shell fragment exerts pressure for composite gland bush 12, makes battery container 2 keep sealing state.After the battery internal gas pressure increased, shell fragment can shrink, beginning pressure release action, and after the pressure release release, shell fragment also can continue to keep the battery container sealing.
Embodiment 1:
Anode pole piece preparation: with LiCoO
2(cobalt acid lithium), Super-P (conductive carbon black), PVDF (gathering inclined to one side fluorine resin) with NMP (N, N-dimethyl pyrrolidone) mix and stir to obtain the slurry of anode pole piece coating at 96: 2: 2.Regulate viscosity through NMP in the whipping process.Then slurry is uniformly coated on the two sides of the thick plus plate current-collecting body of 14um (aluminium foil) according to certain width, makes the anode pole piece that being coated in one side simultaneously.Through colding pressing, cutting into slices, make anode pole piece at last.
Cathode pole piece preparation: with MCMB (anode graphite a kind of; The mesophase pitch based carbon microsphere), Super-P, CMC (water based adhesive, carboxymethyl cellulose), SBR (Styrene Butadiene Rubber rubber) proportionally are 94: 1: 2: 3 mix and stir with deionized water and obtain the negative pole coating sizing-agent.Regulate viscosity through deionized water in the whipping process.Then slurry is coated on the two sides of the thick negative current collector of 9um (Copper Foil) according to certain width, through colding pressing, cutting into slices makes cathode pole piece.
Anode pole piece, barrier film and cathode pole piece coiling back are formed battery 3.
A kind of lithium ion battery comprises 18650 battery containers 2, is seal-installed on the block 1 of 18650 battery containers, 2 upper ends, the baffle plate 4 that is positioned at the battery 3 of 18650 battery containers 2 and is positioned at battery 3 upper ends; Described block 1 and the 2 sealing windings of 18650 battery containers; Described baffle plate 4 is provided with some gas outlets 40; Described block 1 makes 18650 column lithium ion batteries for the present invention blocks a shot 1.Air pressure in described 18650 battery containers 2 is during greater than 2MPa; Described composite gland bush 12 is opened, and beginning pressure release exhaust is when the air pressure in 18650 battery containers 2 during less than 2MPa; Described composite gland bush 12 seals air exit 130 because sealed motive force source 11 acts on.
Embodiment 2:
Adopt with embodiment 1 same preparation technology and make battery 3, just vary in size,, after terminal welding, fluid injection, moulding, operation such as changing into, make 14500 cylindrical secondary lithium batteries battery 14500 box hats 2 of packing into.
Comparative Examples 1:
Adopt with embodiment 1 same preparation technology and make battery,, after terminal welding, fluid injection, moulding, operation such as changing into, make 18650 cylindrical secondary lithium batteries the battery 18650 box hat comparison structure of packing into.
Comparative Examples 2:
Adopt with embodiment 1 same preparation technology and make battery, just vary in size,, after terminal welding, fluid injection, moulding, operation such as changing into, make 14500 cylindrical secondary lithium batteries the battery 14500 box hat comparison structure of packing into.
The battery that embodiment 1, embodiment 2, Comparative Examples 1 and Comparative Examples 2 are made completely is charged to 4.2V, stores 6h down at 100 ℃, and every 2h surveys the voltage of primary cell, and comparative result is as shown in table 1.
The voltage ratio of table 1 4.2V battery after through 100 ℃ of storages
| Group | Before the storage | Behind the 2h | Behind the 4h | Behind the 6h |
| Comparative Examples 1 | 4.172V | 0V | / | / |
| Comparative Examples 2 | 4.175V | 0V | / | / |
| Embodiment 1 | 4.173V | 4.157V | 4.123V | 4.103 |
| Embodiment | ||||
| 2 | 4.175V | 4.153V | 4.120V | 4.101V |
Data from table 1 can find out, adopt battery that the cylindrical structural on the present market makes under 4.2V, behind 100 ℃ of storage 2h, can not survey voltage, and this explanation battery opens circuit.And the battery among the embodiment 100 ℃ the storage 6h after, voltage also about 4.1V, explains that newly-designed structure improves significantly at high temperature safety and stability to battery.
Need to prove that according to the announcement and the elaboration of above-mentioned specification, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should be in the protection range of claim of the present invention to equivalent modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. the safe cap of a lithium ion battery; Comprise top cover (10), the composite gland bush (12), the exhaust gaskets (13) that is provided with air exit (130) that are provided with steam vent (102), be used for and the metallic gasket (15) and the hollow dead ring (16) of positive terminal (30) welding; Described hollow dead ring (16) loads top cover (10), composite gland bush (12), exhaust gaskets (13), metallic gasket (15) successively, it is characterized in that: also comprise the sealed motive force source (11) that is positioned between top cover (10) and the composite gland bush (12).
2. the safe cap of a kind of lithium ion battery according to claim 1 is characterized in that: sealed motive force source (11) are spring or shell fragment.
3. the safe cap of a kind of lithium ion battery according to claim 1, it is characterized in that: also comprise positive temperature coefficient ring plate (14), described positive temperature coefficient ring plate (14) is positioned between exhaust gaskets (13) and the metallic gasket (15).
4. the safe cap of a kind of lithium ion battery according to claim 1 is characterized in that: upper end, described sealed motive force source (11) is fixedly connected with top cover (10), and lower end, described sealed motive force source (11) is fixedly connected with composite gland bush (12).
5. the safe cap of a kind of lithium ion battery according to claim 4, it is characterized in that: described top cover (10) is provided with connector (101), and upper end, described sealed motive force source (11) is fixedly connected with connector (101).
6. the safe cap of a kind of lithium ion battery according to claim 4; It is characterized in that: described composite gland bush (12) is made up of the upper strata (120) of hard material and the lower floor (121) of soft material, and lower end, described sealed motive force source (11) is fixedly connected with the upper strata (120) of composite gland bush (12).
7. the safe cap of a kind of lithium ion battery according to claim 6, it is characterized in that: the upper strata (120) and the lower floor (121) of said composite gland bush (12) all cover air exit (130).
8. the safe cap of a kind of lithium ion battery according to claim 1, it is characterized in that: the sidewall of described top cover (10) is provided with a steam vent (102) at least.
9. lithium ion battery, comprise housing (2), be seal-installed on housing (2) upper end block (1), be positioned at the battery (3) of housing (2) and be positioned at the baffle plate (4) on the battery (3);
Described block (1) and housing (2) sealing winding;
Described baffle plate (4) is provided with some gas outlets (40);
It is characterized in that: described block (1) is the described block of claim 1-8 (1).
10. a kind of lithium ion battery according to claim 9; It is characterized in that: the air pressure in the described housing (2) is during greater than 2MPa; Described composite gland bush (12) is opened, and beginning pressure release exhaust is when the air pressure in the housing (2) during less than 2MPa; Described composite gland bush (12) seals air exit (130) under the effect of sealed motive force source (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010624408A CN102332544A (en) | 2010-12-31 | 2010-12-31 | Lithium ion battery and safety cap thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010624408A CN102332544A (en) | 2010-12-31 | 2010-12-31 | Lithium ion battery and safety cap thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102332544A true CN102332544A (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010624408A Pending CN102332544A (en) | 2010-12-31 | 2010-12-31 | Lithium ion battery and safety cap thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811014A (en) * | 2016-04-27 | 2016-07-27 | 浙江谷神能源科技股份有限公司 | Composite current collector plate for lithium-ion battery and application method of composite current collector plate |
| CN105826597A (en) * | 2016-04-27 | 2016-08-03 | 浙江谷神能源科技股份有限公司 | Battery cell |
| CN106328856A (en) * | 2015-06-17 | 2017-01-11 | 深圳市沃特玛电池有限公司 | High-reliability lithium battery cap |
| CN106784440A (en) * | 2017-01-04 | 2017-05-31 | 国轩新能源（苏州）有限公司 | Cylindrical battery elastic press type block |
| CN107170920A (en) * | 2017-05-18 | 2017-09-15 | 芜湖中科智捷信息科技有限责任公司 | A kind of lithium battery Explosion-proof cap |
| CN107403895A (en) * | 2017-08-30 | 2017-11-28 | 安徽环鑫电子有限公司 | A kind of novel battery cover cap breaks opening structure |
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| CN2583815Y (en) * | 2002-11-13 | 2003-10-29 | 南通硬派电池有限公司 | Cylindrical lithium ion cell seal |
| CN1841821A (en) * | 2005-03-30 | 2006-10-04 | 三洋电机株式会社 | Battery |
| CN201608214U (en) * | 2009-12-17 | 2010-10-13 | 程树国 | Double explosion protection combined cover cap for cylindrical battery |
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2010
- 2010-12-31 CN CN201010624408A patent/CN102332544A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2583815Y (en) * | 2002-11-13 | 2003-10-29 | 南通硬派电池有限公司 | Cylindrical lithium ion cell seal |
| CN1841821A (en) * | 2005-03-30 | 2006-10-04 | 三洋电机株式会社 | Battery |
| CN201608214U (en) * | 2009-12-17 | 2010-10-13 | 程树国 | Double explosion protection combined cover cap for cylindrical battery |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106328856A (en) * | 2015-06-17 | 2017-01-11 | 深圳市沃特玛电池有限公司 | High-reliability lithium battery cap |
| CN105811014A (en) * | 2016-04-27 | 2016-07-27 | 浙江谷神能源科技股份有限公司 | Composite current collector plate for lithium-ion battery and application method of composite current collector plate |
| CN105826597A (en) * | 2016-04-27 | 2016-08-03 | 浙江谷神能源科技股份有限公司 | Battery cell |
| CN105811014B (en) * | 2016-04-27 | 2018-08-24 | 浙江谷神能源科技股份有限公司 | A kind of lithium ion battery Composite Set flow table and its application method |
| CN106784440A (en) * | 2017-01-04 | 2017-05-31 | 国轩新能源（苏州）有限公司 | Cylindrical battery elastic press type block |
| CN106784440B (en) * | 2017-01-04 | 2021-11-19 | 上海电气国轩新能源科技(苏州)有限公司 | Cylinder battery spring type cap |
| CN107170920A (en) * | 2017-05-18 | 2017-09-15 | 芜湖中科智捷信息科技有限责任公司 | A kind of lithium battery Explosion-proof cap |
| CN107403895A (en) * | 2017-08-30 | 2017-11-28 | 安徽环鑫电子有限公司 | A kind of novel battery cover cap breaks opening structure |
| CN107403895B (en) * | 2017-08-30 | 2024-05-07 | 南京善若网络科技有限公司 | Novel battery cap snap-open structure |
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Application publication date: 20120125 |