CN103296305B - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN103296305B CN103296305B CN201310177160.9A CN201310177160A CN103296305B CN 103296305 B CN103296305 B CN 103296305B CN 201310177160 A CN201310177160 A CN 201310177160A CN 103296305 B CN103296305 B CN 103296305B
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- Prior art keywords
- temperature
- battery
- safety tab
- lithium ion
- positive pole
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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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- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
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, more particularly, to a kind of lithium ion battery.
Background technology
Lithium ion battery due to having the advantages that energy density height, good cycle, running voltage be high, memory-less effect,
Become one of secondary cell being most widely used.But, safety problem is always and restricts what lithium ion battery developed further
One key factor, especially lithium ion battery of electric automobile.
In the charge and discharge process of lithium ion battery, due to the internal resistance of electrochemical reaction and battery itself, easily produce heat
Amount.If these heats can not be discharged in time, can accumulate together, if heat long time integration, may result in electricity
Pond produces problems of excessive heat, or even thermal runaway, thus affecting chemical property and the security performance of battery.Therefore, by external temperature
Degree protection device, can with effectively solving ion battery abuse when thermal runaway safety problem.
At present, business-like lithium ion battery, generally in battery surface positive pole ear position welding temperature electrical fuse element
As protection device.When battery is abused, such as big battery charge and discharge, overcharge etc., battery-heating is serious, and temperature rises rapidly.
When the break-off signal that temperature is higher than Thermal Cutoffs element, Thermal Cutoffs element movement, cuts off whole circuit in time, makes electricity
Discharge and recharge can not be continued in pond, prevents battery temperature from continuing to raise it is ensured that battery is in a safe condition.When battery temperature drops to temperature
During degree electric fuse connection temperature, Thermal Cutoffs recovers to connect, and battery then can normal work.
But, because Thermal Cutoffs is installed on battery core surface, the temperature that Thermal Cutoffs senses can not react electricity
True temperature within pond.Additionally, all parts of battery are not the good conductor of heat, such as battery bag pack, its heat conduction
Poor-performing.Therefore, when battery is abused and adstante febre, inside battery heat can not be transmitted to Thermal Cutoffs element in time
Above so that there is larger temperature difference between the temperature of Thermal Cutoffs temperature-sensing element and the true temperature of inside battery, exist
Hysteresis.Even if when battery temperature rises to dangerous temperature, the temperature that now Thermal Cutoffs senses is still within pacifying
Total state, will not action and cut off circuit.This hysteresis, for the security performance of lithium ion battery, is very unfavorable
's.
Content of the invention
It is an object of the invention to：For the deficiencies in the prior art, and provide a kind of lithium ion battery of design safety, should
Lithium ion battery in real time the true temperature of inside battery can be delivered to Thermal Cutoffs it is ensured that Thermal Cutoffs and inside battery
Temperature is consistent, when internal temperature of battery reaches Thermal Cutoffs operating temperature, cuts off circuit immediately, it is to avoid because temperature lag is led
The thermal runaway causing, thus ensure the security performance of battery.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of lithium ion battery, including packaging bag, appearance
The battery core being contained in described packaging bag, the Thermal Cutoffs being arranged at described battery core surface and the electricity being poured in described packaging bag
Solution liquid, described battery core include positive pole diaphragm, cathode membrane and be arranged between described positive pole diaphragm and described cathode membrane every
From film, the front end of described battery core is provided with positive pole ear and negative lug, and the front end of described battery core is additionally provided with safety tab, institute
State safety tab and contact connection with described Thermal Cutoffs.
Described Thermal Cutoffs is provided with temperature sensing device.
One end of described safety tab is located at the inside of described battery core and is fixed on described isolating membrane, described safety tab
The other end is connected with described temperature sensing device.
Safety tab within positioned at described battery core is coated with dielectric film, and the material of described dielectric film is polyethylene, poly- third
Any one in alkene, polyethylene terephthalate, polyamide, Merlon and acrylic resin.
The material of described safety tab is identical with the material of described positive pole ear or the material of described negative lug.
The material of described safety tab is any one in Al, Ni and Cu.
Described positive pole ear, described negative lug and described safety tab are provided with sealing gasket.
The beneficial effects of the present invention is：The present invention includes packaging bag, the battery core being contained in packaging bag, is arranged at battery core
The Thermal Cutoffs on surface and the electrolyte being poured in packaging bag, described battery core includes positive pole diaphragm, cathode membrane and setting
Isolating membrane between positive pole diaphragm and cathode membrane, the front end of battery core is provided with positive pole ear and negative lug, before battery core
End is additionally provided with safety tab, and safety tab contacts connection with Thermal Cutoffs.The safety tab of the present invention is not turned on battery,
But directly turn on the temperature sensing device of Thermal Cutoffs, so as to the true temperature of inside battery is delivered to Temperature protection in real time
Silk, it is ensured that Thermal Cutoffs is consistent with inside battery true temperature, when temperature reaches Thermal Cutoffs operating temperature, is cut immediately
Deenergizing, it is to avoid answer the thermal runaway that temperature lag leads to, thus ensure the security performance of battery.Additionally, safety tab will be installed
The most acutely locate in battery core internal temperature highest point or heat production, near such as positive pole ear, near negative lug, the center of battery core
Place.Work as electric current when battery charges and enter plus plate current-collecting body through positive pole ear, because positive pole ear and collector are typically to weld
Together, its contact resistance is larger, and edge effect, produces substantial amounts of heat.Conversely, when the cell is discharged, at negative lug
Substantial amounts of heat equally can be produced.Through test of many times, inventor finds its temperature of center of battery core and positive pole ear or negative
The temperature of pole lug is closest, and therefore safety tab can be arranged on the center of battery core.So that Thermal Cutoffs can be real
When receive the maximum temperature signal of battery core, react in time, improve security performance.
Brief description
Fig. 1 is the core strueture schematic diagram of lithium ion battery of the present invention.
Fig. 2 is the installation diagram of safety tab of the present invention.
Fig. 3 is Section A-A figure in Fig. 1.
Fig. 4 is the installation diagram of the Thermal Cutoffs of the present invention.
Fig. 5 is safety tab and the Thermal Cutoffs relative position schematic diagram of the present invention.
Specific embodiment
With reference to the accompanying drawings and detailed description the present invention and its advantage are described in detail, but the present invention
Embodiment not limited to this.
Embodiment 1, as shown in Fig. 1 ~ 5, a kind of lithium ion battery, including packaging bag, the battery core 1 that is contained in packaging bag,
It is arranged at the Thermal Cutoffs 3 on battery core 1 surface and the electrolyte being poured in packaging bag, battery core 1 includes positive pole diaphragm 15, negative pole
Diaphragm 17 and the isolating membrane 16 being arranged between positive pole diaphragm 15 and cathode membrane 17, the front end of battery core 1 is provided with positive pole ear
11 and negative lug 12, the front end of battery core 1 is additionally provided with safety tab 13, and safety tab 13 contacts connection with Thermal Cutoffs 3,
Safety tab 13 is arranged at the positive pole ear 11 of battery core 1.
Preferably, Thermal Cutoffs 3 is provided with temperature sensing device 31.
One end of safety tab 13 is located at the inside of battery core 1 and is fixed on isolating membrane 16, the other end of safety tab 13 with
Temperature sensing device 31 connects, and safety tab 13 will not be turned on battery, but directly can turn on temperature sensing device 31, thus by battery core 1
Internal temperature is delivered to temperature sensing device 31 in time so that the temperature of Thermal Cutoffs 3 is consistent with the internal true temperature of battery core 1,
Avoid temperature lag.
Safety tab 13 within positioned at battery core 1 is coated with dielectric film 4, and to avoid the direct short-circuit of battery core 1, or temperature is protected
Dangerous silk 3 lost efficacy, the material of dielectric film 4 is polyethylene, polypropylene, polyethylene terephthalate, polyamide, Merlon and
Any one in acrylic resin.
Preferably, the material of safety tab 13 is identical with the material of positive pole ear 11 or the material of negative lug 12, safety
The material of lug 13 is Al, and general safety tab 13 is the good sheet metal of heat conductivity or metal alloy.
Preferably, positive pole ear 11, negative lug 12 and safety tab 13 are provided with sealing gasket 14, in order to packaging
Bag sealing it is ensured that the sealing property of battery, and safety tab 13, positive pole ear 11 and negative lug 12 be generally aligned in the same plane and
Same one end, it is to avoid additionally increase cell thickness, and ensure follow-up encapsulation performance.
Embodiment 2, as different from Example 1：The material of the safety tab 13 of the present embodiment is Ni, and safety tab 13 sets
Put at the negative lug 12 of battery core 1.
Other same as Example 1, it is not repeated herein.
Embodiment 3, as different from Example 2：The material of the safety tab 13 of the present embodiment is Cu, and safety tab 13 sets
Put the center in battery core 1.
Other same as Example 2, it is not repeated herein.
Comparative example 1, as different from Example 1：This comparative example is not provided with safety tab 13, for conventional normal battery.
Other same as Example 1, it is not repeated herein.
Table 1 is embodiment 1, the lithium ion battery of embodiment 2, embodiment 3 and comparative example 1 is crossed with the multiplying power of 1C and is charged to voltage
For 10V, and the constant-voltage charge result of 4 hours under the voltage of 10V.From test result as can be seen that the lithium ion of prior art
Battery can not guarantee to overcharge test by this completely, and uses lithium ion battery provided by the present invention, and this overcharges the equal energy of test
All pass through.Therefore lithium ion battery provided by the present invention can guarantee that security performance.
Table 1 is the over-charging test result of the embodiment of the present invention and comparative example:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | |
| Sample Cell number | 5 | 5 | 5 | 5 |
| Catch fire cell number | 0 | 0 | 0 | 4 |
| By cell number | 5 | 5 | 5 | 1 |
The announcement of book and teaching according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is changed.Therefore, the invention is not limited in above-mentioned specific embodiment, every those skilled in the art exist
On the basis of the present invention, done any conspicuously improved, replacement or modification belong to protection scope of the present invention.This
Outward, although employing some specific terms in this specification, these terms merely for convenience of description, not to the present invention
Constitute any restriction.
Claims (5)
1. a kind of lithium ion battery, the battery core including packaging bag, being contained in described packaging bag, is arranged at described battery core surface
Thermal Cutoffs and the electrolyte being poured in described packaging bag, described battery core includes positive pole diaphragm, cathode membrane and is arranged at
Isolating membrane between described positive pole diaphragm and described cathode membrane, the front end of described battery core is provided with positive pole ear and negative pole pole
Ear, when temperature reaches the operating temperature of described Thermal Cutoffs, whole circuit, its feature are cut off in described Thermal Cutoffs action
It is：The front end of described battery core is additionally provided with safety tab, and described safety tab contacts connection with described Thermal Cutoffs, described
Thermal Cutoffs is provided with temperature sensing device, and one end of described safety tab is located at the inside of described battery core and is fixed on described isolation
Film, the other end of described safety tab is connected with described temperature sensing device；Safety tab, positive pole ear and negative lug are located at same
Plane.
2. lithium ion battery according to claim 1 it is characterised in that：Safety tab cladding within positioned at described battery core
There is dielectric film, the material of described dielectric film is polyethylene, polypropylene, polyethylene terephthalate, polyamide, Merlon
With any one in acrylic resin.
3. lithium ion battery according to claim 1 and 2 it is characterised in that：The material of described safety tab with described just
The material of the material of pole lug or described negative lug is identical.
4. lithium ion battery according to claim 3 it is characterised in that：The material of described safety tab is Al, Ni and Cu
In any one.
5. lithium ion battery according to claim 4 it is characterised in that：Described positive pole ear, described negative lug and institute
State safety tab and be 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 CN103296305A (en) | 2013-09-11 |
| CN103296305B true CN103296305B (en) | 2017-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310177160.9A Active CN103296305B (en) | 2013-05-14 | 2013-05-14 | Lithium ion battery |
Country Status (1)
| Country | Link |
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| CN (1) | CN103296305B (en) |
Families Citing this family (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 |
| CN110071255B (en) * | 2018-01-23 | 2022-09-09 | 宁德新能源科技有限公司 | Battery cell 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2284926A2 (en) * | 2009-08-11 | 2011-02-16 | Samsung SDI Co., Ltd. | Secondary battery |
| 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 |
| 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 |
| CN103035970A (en) * | 2011-10-07 | 2013-04-10 | 三星Sdi株式会社 | Rechargeable battery |
-
2013
- 2013-05-14 CN CN201310177160.9A patent/CN103296305B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2284926A2 (en) * | 2009-08-11 | 2011-02-16 | Samsung SDI Co., Ltd. | Secondary battery |
| 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 |
| CN103035970A (en) * | 2011-10-07 | 2013-04-10 | 三星Sdi株式会社 | Rechargeable battery |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN103296305A (en) | 2013-09-11 |
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