CN2824297Y - Safety lithium ion cell - Google Patents
Safety lithium ion cell Download PDFInfo
- Publication number
- CN2824297Y CN2824297Y CNU2005200596872U CN200520059687U CN2824297Y CN 2824297 Y CN2824297 Y CN 2824297Y CN U2005200596872 U CNU2005200596872 U CN U2005200596872U CN 200520059687 U CN200520059687 U CN 200520059687U CN 2824297 Y CN2824297 Y CN 2824297Y
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- CN
- China
- Prior art keywords
- battery
- lithium ion
- sealing
- inner layers
- flexible package
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Y02E60/122—
Abstract
The utility model relates to the technical field of a lithium ion battery, particularly a lithium ion battery which is used safely. The battery comprises a soft package and a battery core which is sealed in the soft package, wherein a plastic rubber film, the melting point of which is lower than that of the sealing positions is partially arranged between sealing parts of the soft package; the soft package is formed by the composition of an outer layer, a middle layer and inner layers; the sealing parts are formed into a bag-shaped package body used for the placement of a battery core through the hot pressing adhesive joint of the two inner layers; the plastic rubber film, the melting point of which is lower than that of the inner layers, is positioned between the partial sealing parts of the two inner layers. After the sandwich structure is adopted, the phenomenon of the temperature rise of the battery happens, and the temperature rises to a definite value, the plastic rubber film melts, and then, each of the sealing parts has a notch; therefore, pressure release in the battery is caused; the danger of battery explosion is eliminated so the battery is ensured not to do harm to users or the operating environment of the battery. The utility model becomes a lithium ion battery which is used safely.
Description
Technical field:
The utility model relates to technical field of lithium ion, refers in particular to a kind of lithium ion battery safe in utilization.
Background technology:
Along with the development of modernized society, mobile device has obtained application more and more widely (as information and the communication industry at high speed development), has formed the wilderness demand to high-energy battery thus.Because the specific energy height of lithium battery and lithium ion battery, thereby obtain the great attention of countries in the world.The performance of polymer Li-ion battery is better than liquid state electrolyte battery in many aspects simultaneously, for example its specific energy density height, manufacture craft is simple, shape is flexible and changeable (can be made into the flat structure of different shape, thickness can less than 1 millimeter), no liquid leakage, long shelf-life, normally do not discharge and recharge and can produce gas or the like.Reveal and normally discharge and recharge Shi Buhui just because of its no liquid and produce gas, so it can adopt the flexible package of light Vacuum Package.But also there is certain deficiency in flexible packing lithium ion battery, for example, occur overcharging or the battery short circuit situation under, flexible packing lithium ion battery will produce bigger heat and gas, this moment is if untimelyly discharge heat, gas, dangerous situation such as air-blowing just might occur, burst, catch fire.Usually the hard packing battery product all can adopt safety device to eliminate the generation of this situation, for example adopts on the battery container that punching press forms and is carved with indentation, detects the fail safe of battery by hindering degree quarter; Be to adopt housing to be provided with an explosionproof hole in addition.But the lithium ion battery of flexible package can't adopt above-mentioned structure as the battery of hard packing, and in order to address the above problem, people design following several security protection mode at present:
One, protective circuit is set on battery, makes battery reaching under the setting situation, circuit is disconnected by this protection battery.PTC (positive temperature coefficient element) or thermistor, hot melt element or the like for example are set, after the temperature of battery rises to certain altitude, by the failure of current or the restriction electric current of these elements with circuit in circuit.
Two, strengthen the heat sinking function of battery flexible package, for example adopt special material or structure fabrication flexible package, to improve its heat-sinking capability.
Three, at the sealing position of flexible package a weak adhesion area is set, promptly the bonding strength in this heat bonding zone (employing particular adhesive) is 50～80% of other sealing area bonding strengths, like this when the high temperature air-blowing occurring, pressure do not reach burst before, just break through this weak adhesion area earlier, pressure is discharged, eliminate danger.
Aforesaid way, though certain safeguard function is all arranged to a certain extent, still there are many deficiencies in itself, for example has deficiencies such as making trouble (for example first kind of mode), unstable properties (for example second and third kind mode).
The utility model content:
Technical problem to be solved in the utility model just is to overcome the shortcoming of present product, and a kind of safety lithium ion cell of simple in structure, easy to make, stable performance is provided.
For solving the problems of the technologies described above, the utility model has adopted following technical scheme: this battery comprises flexible package and is sealed in the interior battery of flexible package that the part is provided with a fusing point and seals the low-melting plastic film in position between the sealing of flexible package.
Described flexible package is composited by being positioned at skin, intermediate layer and internal layer, and sealing is by the bonding bag shape package body that is formed for placing battery of the hot pressing between two internal layers, fusing point than the low plastic film of internal layer between the partially sealed portion of two internal layers.
After adopting this sandwich, if after the situation of battery intensification takes place, after rising to certain altitude, the plastic film in the battery flexible package is at first melted, and makes sealing breach occur, causes the pressure in the battery to discharge, and eliminates the danger that battery bursts.To guarantee that battery can not work the mischief to user or its environment for use, become a kind of safe lithium ion battery.
Description of drawings:
The present invention is further illustrated below in conjunction with accompanying drawing:
Fig. 1 is a schematic perspective view of the present utility model;
Fig. 2 is a structural representation of the present utility model;
Fig. 3 is a partial sectional view of the present utility model.
Embodiment:
See Fig. 1,2,3, the utility model mainly comprises: flexible package 1 and the battery 2 that is sealed in the flexible package 1.Wherein flexible package 1 is composited by skin 11, intermediate layer 12 and internal layer 13, and sealing 10 is by the bonding bag shape Soft Roll body that is formed for placing battery 2 of the hot pressing between two internal layers 13.For example, the skin 11 of flexible package 1 is adopted as PET (polyethylene terephthalate) material, and intermediate layer 12 is an aluminium foil, and internal layer 13 is PE (polyethylene) or PP (polypropylene) material, and this trilaminate material is combined into the flexible packing material composite bed.During making, can adopt a bar shaped composite bed, earlier this composite bed is folded to form a square two-layer composite bed, amount to the limit and just need not seal, only other three limits can need be formed a sealing bag by hot sealing, and battery 2 be located in this sealing bag.The electrode slice 21,22 (comprising cathode sheets and anode strip) of battery 2 is extended by a sealing strip simultaneously, as two lugs of battery.
One fusing point than the low plastic film 3 of internal layer 13 between two internal layers, 13 partially sealed positions.
For example, the blast temperature limit of supposing battery is 180 degrees centigrade, and general flexible package 1 internal layer 13 employing fusing points are 180～200 degrees centigrade material, and this plastic film 3 can adopt 100～120 degrees centigrade material.After adopting this sandwich,, cause the pressure in the battery to discharge, eliminate the danger that battery bursts if after the situation of battery intensification took place, when rising to after 100～120 degrees centigrade, plastic film 3 was at first melted, and makes sealing 10 breach occur.
In the manufacturing process kind, should be noted that the width of plastic film 3 should be consistent with the width of flexible package 1 sealing.If the width of plastic film 3 is narrower, even then may cause plastic film 3 to be melted, sealing 10 still has local the connection, causes gas to get rid of, and danger still exists.Have only when the width of plastic film 3 is consistent with the width of sealing 10, melt when plastic film 3, the sealing 10 of this position just may form the release of pressure breach.
Above-mentioned plastic film 3 is positioned at the particular location of sealing 10 and does not do qualification, and it can be positioned at any position of sealing 10.For example plastic film 3 can be positioned at the lug 21 of battery or/and 22 positions.
Claims (3)
1, safety lithium ion cell, comprise: flexible package (1) and be sealed in battery (2) in the flexible package (1), it is characterized in that: local location is provided with a fusing point than the low-melting plastic film of sealing (10) (3) between the sealing (10) of flexible package (1).
2, safety lithium ion cell according to claim 1, it is characterized in that: described flexible package (1) is composited by outer (11), intermediate layer (12) and internal layer (13), sealing (10) is by the bonding bag shape sealed packaging that is formed for placing battery (2) of the hot pressing between two internal layers (13), and the plastic film (3) that fusing point is low than internal layer (13) is positioned between the partially sealed position of two internal layers (13).
3, safety lithium ion cell according to claim 1 and 2 is characterized in that: the width of described plastic film (3) is consistent with the width of sealing (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200596872U CN2824297Y (en) | 2005-06-15 | 2005-06-15 | Safety lithium ion cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200596872U CN2824297Y (en) | 2005-06-15 | 2005-06-15 | Safety lithium ion cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2824297Y true CN2824297Y (en) | 2006-10-04 |
Family
ID=37033417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200596872U Expired - Fee Related CN2824297Y (en) | 2005-06-15 | 2005-06-15 | Safety lithium ion cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2824297Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107180929A (en) * | 2016-03-10 | 2017-09-19 | 有量科技股份有限公司 | Lithium cell core structure and its preparation method |
| WO2021195853A1 (en) * | 2020-03-30 | 2021-10-07 | 宁德新能源科技有限公司 | Cell and electronic device having same |
| CN114094255A (en) * | 2020-08-06 | 2022-02-25 | 北京小米移动软件有限公司 | Battery core, manufacturing method thereof and battery |
-
2005
- 2005-06-15 CN CNU2005200596872U patent/CN2824297Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107180929A (en) * | 2016-03-10 | 2017-09-19 | 有量科技股份有限公司 | Lithium cell core structure and its preparation method |
| WO2021195853A1 (en) * | 2020-03-30 | 2021-10-07 | 宁德新能源科技有限公司 | Cell and electronic device having same |
| CN114094255A (en) * | 2020-08-06 | 2022-02-25 | 北京小米移动软件有限公司 | Battery core, manufacturing method thereof and battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |