CN103296305A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN103296305A CN103296305A CN2013101771609A CN201310177160A CN103296305A CN 103296305 A CN103296305 A CN 103296305A CN 2013101771609 A CN2013101771609 A CN 2013101771609A CN 201310177160 A CN201310177160 A CN 201310177160A CN 103296305 A CN103296305 A CN 103296305A
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- battery
- ion 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 invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery which comprises a packaging bag, a cell held in the packaging bag, a temperature fuse arranged on the surface of the ell, and an electrolyte filled in the packaging bag, wherein the cell comprises a positive pole diaphragm, a negative pole diaphragm and an isolation diaphragm arranged between the positive pole diaphragm and the negative pole diaphragm, a positive pole lug and a negative pole lug are arranged at the front end of the cell, and a safety lug is arranged at the front end of the cell, and is in contact connection with the temperature fuse. The safety lug is not conducted with the battery but is directly conducted with a temperature sensing device of the temperature fuse, and thus the temperature inside the battery is transmitted to the temperature fuse in real time, and the temperature fuse is enabled to be consistent with the temperature inside the battery, and when the temperature reaches the acting temperature of the temperature fuse, a circuit is immediately cut off, the thermal runaway caused by temperature delay is avoided, and the safety property of the battery is ensured.
Description
Technical field
The invention belongs to technical field of lithium ion, relate in particular to a kind of lithium ion battery.
Background technology
Lithium ion battery becomes one of secondary cell that is most widely used owing to have advantages such as energy density height, good cycle, operating voltage height, memory-less effect.But safety problem is a key factor, especially the electric automobile lithium ion battery that the restriction lithium ion battery further develops always.
In the charge and discharge process of lithium ion battery, because the internal resistance of electrochemical reaction and battery self is easy to generate heat.If these heats can not in time be discharged, can be accumulated in together, if the heat long time integration may cause battery to produce problems of excessive heat, even thermal runaway, thereby influence chemical property and the security performance of battery.Therefore, by the external temperature protective device, can effectively solve the thermal runaway safety problem of ion battery when abuse.
At present, business-like lithium ion battery, usually at battery surface positive pole ear position welding temperature electrical fuse element as protective device.When battery is abused, charge and discharge, overcharge etc. as macrocell, the battery heating is serious, and temperature rises rapidly.When temperature was higher than the break-off signal of Thermal Cutoffs element, entire circuit was in time cut off in the action of Thermal Cutoffs element, makes battery can not continue to discharge and recharge, and prevented that battery temperature from continuing to raise, and guaranteed that battery is in a safe condition.When battery temperature dropped to Thermal Cutoffs connection temperature, Thermal Cutoffs recovered to connect, and battery then can operate as normal.
But, because Thermal Cutoffs is installed on electric wicking surface, the true temperature that the temperature that Thermal Cutoffs is sensed can not reaction cell inside.In addition, each parts of battery are not the good conductor of heat, for example power brick pack, and its heat conductivility is relatively poor.Therefore, when battery is abused and adstante febre, the inside battery heat can not in time be transmitted on the Thermal Cutoffs element, makes to have bigger temperature difference between the true temperature of the temperature of Thermal Cutoffs temperature-sensing element and inside battery, has hysteresis.Even when battery temperature rises to dangerous temperature, this moment, the temperature sensed of Thermal Cutoffs still was in a safe condition, and can not move and cut off circuit.This hysteresis is very disadvantageous for the security performance of lithium ion battery.
Summary of the invention
The objective of the invention is to: at the deficiencies in the prior art, and provide a kind of lithium ion battery of design safety, this lithium ion battery can be delivered to Thermal Cutoffs in real time with the true temperature of inside battery, guarantee that Thermal Cutoffs is consistent with internal temperature of battery, when internal temperature of battery reaches the Thermal Cutoffs operating temperature, cut off circuit immediately, avoid the thermal runaway that causes because of temperature lag, thereby guarantee the security performance of battery.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of lithium ion battery, comprise packaging bag, be contained in the interior electric core of described packaging bag, be arranged at the Thermal Cutoffs of described electric wicking surface and be poured into the interior electrolyte of described packaging bag, described electric core comprises anodal diaphragm, cathode membrane and is arranged at barrier film between described anodal diaphragm and the described cathode membrane, the front end of described electric core is provided with positive pole ear and negative lug, the front end of described electric core also is provided with safe lug, and described safe lug is connected with described Thermal Cutoffs contact.
Described Thermal Cutoffs is provided with temperature sensing device.
One end of described safe lug is positioned at the inside of described electric core and is fixed in described barrier film, and the other end of described safe lug is connected with described temperature sensing device.
The safe lug that is positioned at described electric in-core portion is coated with dielectric film, and the material of described dielectric film is any one in polyethylene, polypropylene, PETG, polyamide, Merlon and the acrylic acid resin.
The material of described safe lug is identical with the material of the material of described positive pole ear or described negative lug.
The material of described safe lug is any one among Al, Ni and the Cu.
Described positive pole ear, described negative lug and described safe lug are provided with sealing gasket.
Beneficial effect of the present invention is: the present invention includes packaging bag, be contained in the interior electric core of packaging bag, be arranged at the Thermal Cutoffs of electric wicking surface and be poured into the interior electrolyte of packaging bag, described electric core comprises anodal diaphragm, cathode membrane and is arranged at barrier film between anodal diaphragm and the cathode membrane, the front end of electricity core is provided with positive pole ear and negative lug, the front end of electricity core also is provided with safe lug, and safe lug is connected with the Thermal Cutoffs contact.Safe lug of the present invention not with the battery conducting, but with the direct conducting of the temperature sensing device of Thermal Cutoffs, thereby the true temperature of inside battery can be delivered to Thermal Cutoffs in real time, guarantee that Thermal Cutoffs is consistent with the inside battery true temperature, when temperature reaches the Thermal Cutoffs operating temperature, cut off circuit immediately, avoid the thermal runaway of answering temperature lag to cause, thereby guarantee the security performance of battery.In addition, safe lug will be installed on electric in-core portion's temperature highest point or the most violent place of heat production, near positive pole ear, and near the negative lug, the center of electric core.Work as electric current and enter plus plate current-collecting body through positive pole ear when battery charge, because positive pole ear and collector normally weld together, its contact resistance is bigger, and edge effect, produces a large amount of heat.Otherwise when battery discharge, the negative lug place can produce a large amount of heat equally.Through test of many times, the inventor finds that its temperature of center of electric core is the most approaching with the temperature of positive pole ear or negative lug, so safe lug can be arranged on the center of electric core.Thereby make Thermal Cutoffs can receive the maximum temperature signal of electric core in real time, reaction in time improves security performance.
Description of drawings
Fig. 1 is the core strueture schematic diagram of lithium ion battery of the present invention.
Fig. 2 is the installation diagram of the safe lug of the present invention.
Fig. 3 is A-A sectional view among Fig. 1.
Fig. 4 is the installation diagram of Thermal Cutoffs of the present invention.
Fig. 5 is safe lug of the present invention and Thermal Cutoffs relative position schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention and beneficial effect thereof are elaborated, but embodiments of the present invention are not limited thereto.
Preferably, Thermal Cutoffs 3 is provided with temperature sensing device 31.
One end of safe lug 13 is positioned at the inside of electric core 1 and is fixed in barrier film 16, the other end of safe lug 13 is connected with temperature sensing device 31, safe lug 13 not can with the battery conducting, but can with temperature sensing device 31 direct conductings, thereby electric core 1 temperature inside in time is delivered to temperature sensing device 31, make that the temperature of Thermal Cutoffs 3 is consistent with electric core 1 inner true temperature, avoid temperature lag.
The safe lug 13 that is positioned at electric core 1 inside is coated with dielectric film 4, to avoid the direct short-circuit of electric core 1, or Thermal Cutoffs 3 inefficacies, the material of dielectric film 4 is any one in polyethylene, polypropylene, PETG, polyamide, Merlon and the acrylic acid resin.
Preferably, the material of the material of safe lug 13 and positive pole ear 11 or the material of negative lug 12 are identical, and the material of safe lug 13 is Al, and general safe lug 13 is the good sheet metal of thermal conductivity or metal alloy.
Preferably, positive pole ear 11, negative lug 12 and safe lug 13 are provided with sealing gasket 14, so that seal with packaging bag, guarantee the sealing property of battery, and safe lug 13, positive pole ear 11 and negative lug 12 are positioned at same plane and same end, avoid additionally increasing cell thickness, and guarantee follow-up encapsulation performance.
Embodiment 2,As different from Example 1: the material of the safe lug 13 of present embodiment is Ni, and safe lug 13 is arranged on negative lug 12 places of electric core 1.
Other identical with embodiment 1 no longer repeated here.
Other identical with embodiment 2 no longer repeated here.
Comparative example 1,As different from Example 1: this comparative example does not arrange safe lug 13, is conventional normal battery.
Other identical with embodiment 1 no longer repeated here.
To be embodiment 1, embodiment 2, embodiment 3 with the lithium ion battery of comparative example 1 cross with the multiplying power of 1C table 1 that to be charged to voltage be 10V, and under the voltage of 10V 4 hours result of constant voltage charge.From test result as can be seen, the lithium ion battery of prior art can not be guaranteed to overcharge test by this fully, and uses lithium ion battery provided by the present invention, and this overcharges test and all can all pass through.So lithium ion battery provided by the present invention can guarantee security performance.
Table 1 is the over-charging test result of the embodiment of the invention and comparative example:
| ? | |
Embodiment 2 | |
Comparative example 1 |
| The sample cell number | 5 | 5 | 5 | 5 |
| The cell number of catching fire | 0 | 0 | 0 | 4 |
| Pass through cell number | 5 | 5 | 5 | 1 |
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the present invention is not limited to above-mentioned embodiment, and any apparent improvement, replacement or modification that every those skilled in the art have done on basis of the present invention all belong to protection scope of the present invention.In addition, although used some specific terms in this specification, these terms do not constitute any restriction to the present invention just for convenience of description.
Claims (7)
1. lithium ion battery, comprise packaging bag, be contained in the interior electric core of described packaging bag, be arranged at the Thermal Cutoffs of described electric wicking surface and be poured into the interior electrolyte of described packaging bag, described electric core comprises anodal diaphragm, cathode membrane and is arranged at barrier film between described anodal diaphragm and the described cathode membrane, the front end of described electric core is provided with positive pole ear and negative lug, it is characterized in that: the front end of described electric core also is provided with safe lug, and described safe lug is connected with described Thermal Cutoffs contact.
2. lithium ion battery according to claim 1, it is characterized in that: described Thermal Cutoffs is provided with temperature sensing device.
3. lithium ion battery according to claim 2, it is characterized in that: an end of described safe lug is positioned at the inside of described electric core and is fixed in described barrier film, and the other end of described safe lug is connected with described temperature sensing device.
4. lithium ion battery according to claim 3, it is characterized in that: the safe lug that is positioned at described electric in-core portion is coated with dielectric film, and the material of described dielectric film is any one in polyethylene, polypropylene, PETG, polyamide, Merlon and the acrylic acid resin.
5. according to each described lithium ion battery of claim 1 ~ 4, it is characterized in that: the material of described safe lug is identical with the material of the material of described positive pole ear or described negative lug.
6. lithium ion battery according to claim 5, it is characterized in that: the material of described safe lug is any one among Al, Ni and the Cu.
7. lithium ion battery according to claim 6, it is characterized in that: described positive pole ear, described negative lug and described safe lug are provided with sealing gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310177160.9A CN103296305B (en) | 2013-05-14 | 2013-05-14 | Lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310177160.9A CN103296305B (en) | 2013-05-14 | 2013-05-14 | Lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103296305A true CN103296305A (en) | 2013-09-11 |
| CN103296305B CN103296305B (en) | 2017-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310177160.9A Active CN103296305B (en) | 2013-05-14 | 2013-05-14 | Lithium ion battery |
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| CN (1) | CN103296305B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711550A (en) * | 2016-12-28 | 2017-05-24 | 深圳天珑无线科技有限公司 | Self-heating battery and terminal equipment |
| CN110071255A (en) * | 2018-01-23 | 2019-07-30 | 宁德新能源科技有限公司 | Battery core and battery |
| CN113629363A (en) * | 2021-08-10 | 2021-11-09 | 天科新能源有限责任公司 | Battery cell structure and energy storage module for preventing thermal runaway from rapidly expanding |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8597807B2 (en) * | 2009-08-11 | 2013-12-03 | Samsung Sdi Co., Ltd. | Secondary battery including a thermally insulating sheet having a recess for receiving a thermal fuse |
| CN202352795U (en) * | 2011-07-21 | 2012-07-25 | 东莞新能源科技有限公司 | Safety structure of lithium ion battery |
| US9099761B2 (en) * | 2011-10-07 | 2015-08-04 | Samsung Sdi Co., Ltd. | Rechargeable battery including temperature protection element connected to lead tab and connection tab |
| CN102593545A (en) * | 2012-02-21 | 2012-07-18 | 东莞新能源科技有限公司 | Lithium ion battery and method for measuring internal temperature thereof |
-
2013
- 2013-05-14 CN CN201310177160.9A patent/CN103296305B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711550A (en) * | 2016-12-28 | 2017-05-24 | 深圳天珑无线科技有限公司 | Self-heating battery and terminal equipment |
| CN110071255A (en) * | 2018-01-23 | 2019-07-30 | 宁德新能源科技有限公司 | Battery core and battery |
| CN113629363A (en) * | 2021-08-10 | 2021-11-09 | 天科新能源有限责任公司 | Battery cell structure and energy storage module for preventing thermal runaway from rapidly expanding |
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| Publication number | Publication date |
|---|---|
| CN103296305B (en) | 2017-02-08 |
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