CN102208585A - Safety valve for lithium ion battery - Google Patents
Safety valve for lithium ion battery Download PDFInfo
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- CN102208585A CN102208585A CN2011101085785A CN201110108578A CN102208585A CN 102208585 A CN102208585 A CN 102208585A CN 2011101085785 A CN2011101085785 A CN 2011101085785A CN 201110108578 A CN201110108578 A CN 201110108578A CN 102208585 A CN102208585 A CN 102208585A
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- Prior art keywords
- battery
- column part
- lithium ion
- valve
- groove
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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 a safety valve for a lithium ion battery. At present, the used safety valve is generally a thin metal sheet arranged on an end cover, and the safety valve is discarded once the battery is opened. In the safety valve provided by the invention, a battery cover plate subjected to injection molding is provided with an installation groove; the bottom of the installation groove is provided with a vent hole; a valve cover with a T-shape section and a valve core are arranged in the installation groove; the valve cover is in threaded connection with the installation groove; the valve cover is provided with an air outlet hole along the axial direction; the bottom surface of the valve cover is provided with a groove; and the valve core is a rubber ball and is arranged between the groove of the bottom surface of the valve cover and the conical surface of the vent hole. The safety valve in the invention has a restorable function, thereby greatly improving the safety of the lithium ion battery, preventing the shell of the battery from protruding and effectively prolonging the service life of the battery.
Description
Technical field
The invention belongs to field of mechanical technique, relate to a kind of valve, specifically is a kind of safety valve for lithium ion cell.
Background technology
In recent years; serious day by day along with energy crisis and global environment problem; the development and application of new forms of energy has become the upsurge in the whole world; adopting LiFePO4 is the lithium-ion-power cell of positive electrode; be regarded as the best energy of new-energy automobiles such as electric automobile, hybrid vehicle, growth momentum is swift and violent.
Along with the appearance of lithium ion battery development of technology and new material, lithium ion battery is more a lot of than lithium ion battery raising in the past in fail safe.Therefore, lithium ion battery is more and more toward large scale development.Especially the lithium ion battery of used for electric vehicle generally adopts large-scale rectangular cell.But the electrolyte of present all kinds of lithium ion batteries adopts carbonate group electrolyte basically.And the lithium ion battery of employing carbonate group electrolyte is in the initial charge process, simultaneously in the normal charge and discharge process of battery, owing to be accompanied by the continuous destruction and the production of SEI film, it is inevitable more than producing being reflected in the battery of gas, carrying out along with charge and discharge cycles, the amount of gas of accumulation is more and more in the battery, causes inner pressure of battery to rise, and brings hidden danger for the fail safe of battery.
At present, general lithium-ion-power cell can be provided with safety valve on end cap, adopts the punching press attenuate to form the foil of band indentation usually, or adopts the sheet metal of prefabricated indentation to be welded in end cap formation safety valve.After inner pressure of battery surpassed set point, sheet metal broke at prefabricated indentation place, and inside battery gas discharges by breach, and inner pressure of battery descends, thereby prevents battery explosion.And in a single day open when the safety valve of this type, battery is also scrapped thereupon, can't re-use.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of safety valve for lithium ion cell is provided, this safety valve can repeat open and close, accurately controls inner pressure of battery, improves the fail safe of battery, prevents the leakage of inside battery electrolyte simultaneously.
Safety valve for lithium ion cell of the present invention is to offer columniform mounting groove on the battery cover board of injection molding, open-top, the bottom of mounting groove have steam vent, mounting groove is communicated with by steam vent with inside lithium ion cell, the underrun taper seat transition of steam vent and mounting groove.
Valve gap and spool are arranged in the mounting groove, and wherein valve gap comprises the last column part and the following column part of integrally formed coaxial setting, and the end face diameter of last column part is greater than the end face diameter of following column part, and the cross section of valve gap integral body is a T shape; The last column part of valve gap is threaded with the upper portion side wall of mounting groove, and last column part has venthole vertically; Following column part bottom surface has groove, and the surface of groove is a sphere.
Spool is a ball, and material is acrylonitrile-butadiene rubber, butadiene-styrene rubber, fluorubber, ethylene-propylene rubber or butyl rubber; Spool is arranged between the taper seat of the groove of column part bottom surface under the valve gap and steam vent, and the diameter of spool is greater than the minimum diameter of the taper seat of steam vent.
The groove sphere and the spool of column part bottom surface is isometrical under the valve gap, and the maximum gauge of groove is less than the diameter of spool.
The predeformation amount of ball
Calculate according to Hooke's law:
Wherein
kElastic deformation coefficient for ball;
For pressing in the lithium ion battery of setting;
r o Least radius for steam vent.
Safety valve of the present invention adopts the method for injection mo(u)lding, directly outpours mounting groove on plastic cover plate, places spool then in mounting groove, tightens valve gap, by setting the predeformation amount of spool ball, reaches the effect of control inner pressure of battery and sealing.When cell internal pressure during greater than setting, this safety valve is opened, discharge unnecessary gas after, safety valve cuts out the sealing that keeps battery again, can accurately control inner pressure of battery, keeps battery security; Safety valve can repeat to open and close simultaneously, prevents the leakage of inside battery electrolyte, guarantees that battery is reliable and practical.The present invention is applicable in the lithium-ion-power cell, especially is fit to be applied in the lithium-ion-power cell of big capacity and high-multiplying power discharge.
But safety valve of the present invention has restore funcitons, can be in the scope of setting with the interior pressure-controlled of battery, and when inner pressure of battery increased, gas that can in time will be unnecessary was discharged outside the battery fail safe of assurance battery; When the interior pressure of battery returned to the value of regulation, it is closed that safety valve then again can be in time, prevents battery leakage, guarantees the operate as normal of battery, can not make that battery is disposable to be scrapped.Therefore, the safety valve that employing can repeat to open and close can improve the fail safe that becomes lithium ion battery greatly, prevent that drum shell phenomenon from appearring in battery, and the working life that can effectively prolong battery.For lithium-ion-power cell, especially as the LiFePO4 class electrokinetic cell of Vehicular dynamic battery, this safety valve can in use provide good safeguard protection effect.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
As shown in Figure 1, a kind of safety valve for lithium ion cell is to offer columniform mounting groove 2 on the battery cover board 1 of injection molding, the open-top of mounting groove 2, bottom have steam vent 6, mounting groove 2 is communicated with by steam vent 6 with inside lithium ion cell, the underrun taper seat transition of steam vent 6 and mounting groove 2.
Valve gap 3 and spool 5 are arranged in the mounting groove 2, wherein valve gap 3 comprises the last column part and the following column part of integrally formed coaxial setting, the end face diameter of last column part is greater than the end face diameter of following column part, the cross section of valve gap 3 integral body is a T shape, the last column part of valve gap 3 is threaded with the upper portion side wall of mounting groove 2, the following column part bottom surface of valve gap 3 has groove, and the surface of groove is a sphere, and the last column part of valve gap 3 has venthole 4 vertically.
The groove sphere and the spool 5 of 3 times column part bottom surfaces of valve gap are isometrical, and the maximum gauge of groove is less than the diameter of spool 5.
The predeformation amount of ball
Calculate according to Hooke's law:
Wherein
kElastic deformation coefficient for ball;
For pressing in the lithium ion battery of setting;
r o Least radius for steam vent.
Behind the plastic cover plate of lithium ion battery and the housing welding fabrication,, put into spool 5 then by the steam vent 6 injection electrolyte of safety valve, tighten valve gap 3, spool 5 is arranged on the taper seat part of steam vent 6, and by spool 5 closed exhaust holes 6, predeformation amount is determined according to the inner pressure of battery of setting.
The battery safety valve that assembles, when cell internal pressure during greater than setting, gas will push up on the ball, and ball deforms.The gas that inside battery produces is in time discharged unnecessary gas by steam vent and venthole discharging, guarantees the fail safe of battery.And cell internal pressure because strained ball returns to former deflection, with the steam vent sealing, prevents the leakage of inside battery electrolyte when being lower than setting pressure.
Claims (3)
1. safety valve for lithium ion cell, it is characterized in that this safety valve is to offer columniform mounting groove on the battery cover board of injection molding, open-top, the bottom of mounting groove have steam vent, mounting groove is communicated with by steam vent with inside lithium ion cell, the underrun taper seat transition of steam vent and mounting groove;
Valve gap and spool are arranged in the mounting groove, and wherein valve gap comprises the last column part and the following column part of integrally formed coaxial setting, and the end face diameter of last column part is greater than the end face diameter of following column part, and the cross section of valve gap integral body is a T shape; The last column part of valve gap is threaded with the upper portion side wall of mounting groove, and last column part has venthole vertically; Following column part bottom surface has groove, and the surface of groove is a sphere;
Described spool is a ball, be arranged between the taper seat of the groove of column part bottom surface under the valve gap and steam vent, and the diameter of spool is greater than the minimum diameter of the taper seat of steam vent; The groove sphere and the spool of column part bottom surface is isometrical under the valve gap, and the maximum gauge of groove is less than the diameter of spool.
2. a kind of safety valve for lithium ion cell as claimed in claim 1 is characterized in that: described spool, its material are acrylonitrile-butadiene rubber, butadiene-styrene rubber, fluorubber, ethylene-propylene rubber or butyl rubber.
3. a kind of safety valve for lithium ion cell as claimed in claim 1 is characterized in that: the predeformation amount of described spool
Calculate according to Hooke's law:
Wherein
kElastic deformation coefficient for ball;
For pressing in the lithium ion battery of setting;
r o Least radius for steam vent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101085785A CN102208585B (en) | 2011-04-28 | 2011-04-28 | Safety valve for lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101085785A CN102208585B (en) | 2011-04-28 | 2011-04-28 | Safety valve for lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102208585A true CN102208585A (en) | 2011-10-05 |
| CN102208585B CN102208585B (en) | 2013-06-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101085785A Expired - Fee Related CN102208585B (en) | 2011-04-28 | 2011-04-28 | Safety valve for lithium ion battery |
Country Status (1)
| Country | Link |
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| CN (1) | CN102208585B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1444305A (en) * | 2002-03-08 | 2003-09-24 | 居永明 | Repeatedly chargeable-dischargeable lighium ion power cell and its production method |
| JP2003338270A (en) * | 2002-05-21 | 2003-11-28 | Nok Corp | One-direction valve |
| CN201699087U (en) * | 2010-04-16 | 2011-01-05 | 沧州荣泰新能源科技有限公司 | Power lithium battery with plastic casing with upper cover with safe sealing device |
| CN202034428U (en) * | 2011-04-28 | 2011-11-09 | 浙江谷神能源科技股份有限公司 | Safety valve for lithium ion battery |
-
2011
- 2011-04-28 CN CN2011101085785A patent/CN102208585B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1444305A (en) * | 2002-03-08 | 2003-09-24 | 居永明 | Repeatedly chargeable-dischargeable lighium ion power cell and its production method |
| JP2003338270A (en) * | 2002-05-21 | 2003-11-28 | Nok Corp | One-direction valve |
| CN201699087U (en) * | 2010-04-16 | 2011-01-05 | 沧州荣泰新能源科技有限公司 | Power lithium battery with plastic casing with upper cover with safe sealing device |
| CN202034428U (en) * | 2011-04-28 | 2011-11-09 | 浙江谷神能源科技股份有限公司 | Safety valve for lithium ion battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102208585B (en) | 2013-06-26 |
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Granted publication date: 20130626 Termination date: 20200428 |
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| CF01 | Termination of patent right due to non-payment of annual fee |