CN207215988U - A kind of insulation pricker for assessing lithium ion battery safety performance - Google Patents
A kind of insulation pricker for assessing lithium ion battery safety performance Download PDFInfo
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- CN207215988U CN207215988U CN201721022915.8U CN201721022915U CN207215988U CN 207215988 U CN207215988 U CN 207215988U CN 201721022915 U CN201721022915 U CN 201721022915U CN 207215988 U CN207215988 U CN 207215988U
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Abstract
The utility model discloses a kind of insulation pricker for assessing lithium ion battery safety performance.The insulation pricker is the cylinder with tip, wherein, for single battery core：The a reference value of needle diameter is 5~8mm, 45 °~60 ° of syringe needle wedge angle span；For battery modules：Needle diameter is 6~10mm.Meet：High resistivity：>109Ω m, electric insulation；Low thermal conductivity：<0.5W m‑1K‑1；The high strength of materials and high rigidity：Meet the puncture intensity requirement of duricrust and soft-package battery；High temperature resistant：Fusing point>175℃；Meet that above-mentioned condition material may act as manufacturing the candidate material of experiment pricker.Diameter can suitably be increased according to the intensity requirement of material therefor in practice；Total length can adjust on the basis of 110mm according to test case.
Description
Technical field
The technical field of lithium ion battery safety performance assessment is the utility model is related to, it is more particularly to a kind of to assess lithium ion
The insulation pricker of battery safety.
Background technology
Lithium ion battery has higher than energy, cell voltage is high, operating temperature range is wide, storage life is long etc. as a kind of
Advantage new energy battery, its application are related to the numerous areas such as portable set, new-energy automobile, energy storage and military affairs.But due to lithium
Contain a large amount of active materials and organic combustibles in ion battery material system, safe thing is easily caused under various abuse conditions
Therefore generation.As occurred, in the electric bus event on fire of Beijing Xie Dao holiday villages 80, to cause nearly hundred million yuan of damages in May, 2017
Lose.For another example the battery of mobile phone explosive incidents of Samsung Note 7 occurred in 2016, all generated in entire society's aspect extensive
Negative effect.Therefore, the security performance for evaluating lithium ion battery is significant.
Research shows, with external short circuit, overcharge, the battery abuse conditions such as overheat compared with, during battery internal short-circuit it is dangerous most
Greatly, thermal runaway and is probably triggered.The induction mode of internal short-circuit includes production burr, inside battery insulation is incomplete, introduces
Metal impurities, Li dendrite and external force extruding puncture tear barrier film etc..The current reality on lithium ion battery internal short-circuit both at home and abroad
Test simulation meanses and do many researchs, including acupuncture and extrusion experiment, the implanted metal impurity and internal short-circuit based on phase-change material
Trigger device.The above method respectively has advantage and disadvantage, but the lithium ion for the simulation internal short-circuit for being widely accepted and being standardized at present
Battery safety evaluation method only has lancing test.According to existing lancing test standard GB/T/T31485-2015《It is electronic
Automobile using power accumulator safety and test method》When carrying out lancing test to battery, because test uses draw point, pierce through
The problems such as current path is excessive and draw point heat conduction amount is excessive after battery be present, cause needled conventionally method of testing to comment exactly
The security performance of valency lithium ion battery.A kind of New insulated pricker that the present invention uses can solve the above problems well.
Utility model content
Battery repid discharge caused by stainless pin and draw point heat conduction during in order to solve conventional lithium ion battery lancing test
Problem, the utility model provide the exotic material system of a kind of high resistivity, low thermal conductivity, the high strength of materials and high rigidity
Into New insulated pricker replace existing lancing test standard GB/T/T31485-2015《Power accumulator used for electric vehicle
Safety and test method》In draw point carry out lancing test.
The technical scheme that the present invention takes is：
A kind of insulation pricker for assessing lithium ion battery safety performance, the insulation pricker is the cylinder with tip, its
In, for single battery core：The a reference value of needle diameter is 5~8mm, 45 °~60 ° of syringe needle wedge angle span；For battery mould
Group：Needle diameter is 6~10mm.
Further, meet：High resistivity：>109Ω m, electric insulation；Low thermal conductivity：<0.5W m-1K-1；Gao Cai
Expect intensity and high rigidity：Meet the puncture intensity requirement of duricrust and soft-package battery；High temperature resistant：Fusing point>175℃；In satisfaction
The condition material of stating may act as manufacturing the candidate material of experiment pricker.
Further, diameter can suitably be increased according to the intensity requirement of material therefor in practice；
Further, total length can adjust on the basis of 110mm according to test case.
Principle of the present utility model is：
There is provided and insulated made of the exotic material of a kind of high resistivity, low thermal conductivity, the high strength of materials and high rigidity
Pricker replaces the draw point in GB/T31485-2015 to carry out lithium ion battery lancing test.It is every meet high resistivity (>109
Ω m, electric insulation), low thermal conductivity (<0.5W m-1K-1), the high strength of materials and high rigidity (meet duricrust and soft-package battery
Puncture intensity requirement) etc. feature high temperature resistant (fusing point>175 DEG C) material may act as manufacture experiment pricker candidate
Material, when the resistivity and thermal conductivity factor and fusing point of material all reach requirement, the strength of materials and hardness should be selected higher
Material, to meet the puncture intensity requirement of duricrust and soft-package battery simultaneously.The manufactured pricker for testing will ensure surface
Smooth pieces, the other specification (needle diameter, needle point angle, acupuncture speed, puncture direction and perforation position etc.) of lancing test
Can suitably it be adjusted on the basis of specified in GB/T31485-2015.
The existing battery lancing test national standard in China is mainly derived from GB/T31485-2015《Power used for electric vehicle
Storage battery safety and test method》, its given battery core and battery pack method of testing are as follows：
1. single battery core pin prick test step：
A) cell batteries method as shown in standard 6.1.3 moneys charges；
B) φ 5mm~φ 8mm high temperature resistant draw point (45 °~60 ° of needle point angle, any surface finish of pin, non-corroding, oxygen is used
Change layer and greasy dirt), with (25 ± 5) mm/s speed, run through from the direction perpendicular to accumulator plate, through position preferably close to institute
The geometric center in thorn face, draw point are rested in battery；
C) 1h is observed.
2. battery pack pin prick test step：
A) battery module method as shown in standard 6.1.4 moneys charges；
B) φ 6mm~φ 10mm high temperature resistant draw point (45 °~60 ° of needle point angle, any surface finish of pin, non-corroding, oxygen is used
Change layer and greasy dirt), with (25 ± 5) mm/s speed, from perpendicular to the direction of accumulator plate, sequentially pass through at least three monomer
Battery, draw point are rested in battery；
C) 1h is observed.
It can be seen that whether for single battery core or battery pack, current standard requires to be carried out using stainless pin
Pin prick test.And two problems can be brought by carrying out lancing test with draw point.First, draw point can form very big electricity after piercing through battery
Logical circulation road, therefore battery can be made to be discharged at a terrific speed, and extruded by external force, the feelings such as machined burrs and lithium dendrite growth
Battery internal short-circuit area caused by condition is smaller compared to meeting, and battery discharge also significantly slows down therewith.Second, due to stainless pin
It is the good conductor of heat, have a big chunk heat during lancing test scatters and disappears via draw point heat conduction.2 points of the above can directly affect
To the validity that this method of the security performance of lithium ion battery is evaluated with lancing test.In view of the above-mentioned problems, the present invention uses
A kind of high resistivity, low thermal conductivity, the high strength of materials and high rigidity exotic material made of New insulated pricker come
Lancing test is carried out instead of the draw point in GB/T31485-2015.The New insulated pricker is electrical insulator in itself, pierces through battery
Positive and negative pole material can form the short circuit of micro- area under the drive of frictional force afterwards so that test case is closer to short in real
Road situation.In addition, New insulated pricker is the non-conductor of heat, so as to solve the Heat Conduction Problems of traditional draw point well.
The beneficial effects of the utility model：
The utility model solves two problems present in needled conventionally test.Lancing test after improvement touches electricity
The discharge mode of pond internal short-circuit closer to extruded as external force, caused by the factor such as machined burrs and lithium dendrite growth in battery it is short
The electric discharge behavior on road.In addition, the draw point that the lancing test method after improving also avoids in needled conventionally test well is led
Heat problem so that battery can heat up under closer real internal short-circuit environment.In a word, the use of New insulated pricker to
The lifting of the validity of this experimental method of lancing test evaluation lithium ion battery safety performance has very positive meaning.
Brief description of the drawings
Fig. 1 illustrates for monnolithic case specification of the present utility model, wherein, Fig. 1 (a) is single battery core acupuncture pin size,
Fig. 1 (b) is battery modules acupuncture gauge.
It is respectively from left to right diameter 5mm polyformaldehyde pin, diameter 8mm polyformaldehyde pin, diameter 5mm wolfram steel in Fig. 2
The pictorial diagram of pin and diameter 8mm wolfram steel pin.
Fig. 3 (a) and (b) are respectively the voltage-time curve of diameter 5mm and 8mm wolfram steel acupuncture experiment.
Fig. 4 (a) and (b) they are respectively two class voltage-time curves of diameter 5mm polyformaldehyde acupuncture experiment, wherein, Fig. 4 (c)
(d) be respectively the acupuncture of diameter 8mm polyformaldehyde experiment two class voltage-time curves.
Fig. 5 is the temperature curve comparison diagram under two kinds of voltage modes in the temperature rise curve of wolfram steel acupuncture and polyformaldehyde acupuncture,
Wherein, Fig. 5 (a) is voltage in the temperature rise curve of the wolfram steel acupuncture of two kinds of diameters and polyformaldehyde acupuncture as corresponding to Mode A change
The comparison diagram of temperature curve, Fig. 5 (b) press pattern for voltage in the temperature rise curve of the wolfram steel acupuncture of two kinds of diameters and polyformaldehyde acupuncture
The comparison diagram of temperature curve corresponding to B changes.
The thermograph that the polyformaldehyde pin acupuncture that Fig. 6 is diameter 5mm is tested.
The thermograph that the wolfram steel pin acupuncture that Fig. 7 is diameter 5mm is tested.
The thermograph that the polyformaldehyde pin acupuncture that Fig. 8 is diameter 8mm is tested.
The thermograph that the wolfram steel pin acupuncture that Fig. 9 is diameter 8mm is tested.
Embodiment：
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model
It can be easier to be readily appreciated by one skilled in the art with feature, it is apparent clear and definite so as to be made to the scope of protection of the utility model
Define.
In embodiments described just below, lithium-ion electric is carried out as the making material of New insulated pricker using polyformaldehyde
Pond lancing test, as control, while traditional draw point lancing test is also carried out.All tests try in special acupuncture
Test in machine and carry out.
Embodiment：
Research respectively using polyformaldehyde and wolfram steel as the lithium ion battery lancing test Contrast on effect of pricker material, Fig. 2 from
Left-to-right is respectively diameter 5mm polyformaldehyde pin, diameter 8mm polyformaldehyde pin, diameter 5mm wolfram steel pin and diameter 8mm
The pictorial diagram of wolfram steel pin.Research object is 100%SOC certain business soft-package battery (capacity：1Ah, electrode material：Cobalt acid lithium/stone
Ink), all tests only deploy to monomer lithium ion battery.Experiment condition arranges as shown in table 1.
The different pricker material lancing test Contrast on effect experiment condition tables of table 1.
Battery open circuit voltage is recorded in real time with battery charge and discharge cycles instrument in experimentation, is gathered in real time with thermocouple close
The battery surface temperature data at acupuncture position, and record temperature change with thermal imaging system is whole.
Analyzed respectively using polyformaldehyde and wolfram steel as the lithium ion battery lancing test Contrast on effect of pricker material：
Fig. 3 (a) and (b) are respectively diameter 5mm and 8mm wolfram steel acupuncture experimental voltage-time graph；Fig. 4 (a) and (b)
Respectively two class voltage-time curves of diameter 5mm polyformaldehyde acupuncture experiment, Fig. 4 (c) and (d) are respectively diameter 8mm polyformaldehyde
Two class voltage-time curves of acupuncture experiment.No matter by observing Fig. 3 and Fig. 4 it can be found that a diameter of 5 or 8mm, draw point
Cell voltage only has a kind of variation tendency after piercing through battery, i.e. acupuncture moment bust is then slowly drop down to hundreds of millivolts
One relatively low level, centre might have a little fluctuation；And it is distinct contrast, no matter a diameter of 5 or 8mm, gather
Cell voltage then has two kinds of changing patteries (being named as Mode A and B respectively) after formaldehyde needle-penetration battery.Mode A pair
The battery open circuit voltage answered, to more than 1,000 millivolts, then gos up to 3700 millivolts or so in acupuncture moment bust；And the electricity of Mode B
Bucklingization is then relatively close to the effect after draw point pierces through.And lithium ion battery extruded by external force, machined burrs and Li dendrite
Caused by situations such as growth during battery internal short-circuit, short-circuit area can be smaller, and battery discharge is also more slowly, therefore polyformaldehyde
Effect after needle-penetration battery is closer to true internal short-circuit scene.
Voltage is by Mode A change pair in the temperature rise curve of wolfram steel acupuncture in Fig. 5 (a) to two kinds of diameters and polyformaldehyde acupuncture
The temperature curve answered contrasts, it can be seen that battery temperature rise caused by wolfram steel pin will be faster than the temperature under polyformaldehyde pin Mode A
Rise, and the maximum temperature that battery can reach after draw point puncture is also higher, this is exactly that can form larger electricity after draw point pierces through battery
Logical circulation road, so that the experiment that battery is discharged with faster speed proves；The temperature of wolfram steel acupuncture in Fig. 5 (b) to two kinds of diameters
Rise voltage temperature curve as corresponding to changing Mode B in curve and polyformaldehyde acupuncture to contrast, it can be found that under same diameter
Polyformaldehyde pin caused by battery temperature rise rate to be significantly faster than that the situation of wolfram steel acupuncture, the conductive force of this explanation draw point is bright
It is aobvious, a big chunk heat is had during lancing test and is guided via draw point, so as to influence the accuracy of test result.
Fig. 6 and Fig. 7 is respectively diameter 5mm polyformaldehyde pin and the thermograph of wolfram steel pin acupuncture experiment.Can by contrast
To find, emerged with about 0.128s focuses in the example of polyformaldehyde pin, to 0.665s or so calorie spread to whole battery, propagated
Time is about 0.537s；And emerged with about 0.325s focuses in the example of wolfram steel pin, to 0.444s or so calorie spread to entirely
Battery, propagation time are only 0.119s.This phenomenon confirmed again draw point above pierce through can make after battery battery with compared with
The conclusion of fast speed electric discharge.
Fig. 8 and Fig. 9 is respectively diameter 8mm polyformaldehyde pin and the thermograph of wolfram steel pin acupuncture experiment.Focus is about in Fig. 8
Initially formed in 0.252s, to 0.505s calorie spreads to whole battery scope, propagation time about 0.253s；And in Fig. 9 from
Focus initially forms calorie spread to whole battery and used close to 0.8s.This is its conductive force after the increase of draw point diameter
The reason to be strengthened.
What the utility model was not disclosed in detail partly belongs to techniques known.
One embodiment of the present utility model is the foregoing is only, not thereby limits protection model of the present utility model
Enclose, every equivalent transformation made using the utility model specification and accompanying drawing content, as long as various conversion are in the utility model
Scope in, or be directly or indirectly used in other related technical areas, be similarly included in guarantor of the present utility model
In the range of shield.
Claims (4)
- A kind of 1. insulation pricker for assessing lithium ion battery safety performance, it is characterised in that：The insulation pricker is with tip Cylinder, wherein, for single battery core：The a reference value of needle diameter is 5~8mm, 45 °~60 ° of syringe needle wedge angle span；Pin To battery modules：Needle diameter is 6~10mm.
- A kind of 2. insulation pricker for assessing lithium ion battery safety performance as claimed in claim 1, it is characterised in that：Meet： High resistivity：>109Ω m, electric insulation；Low thermal conductivity：<0.5W m-1K-1；The high strength of materials and high rigidity：Meet duricrust With the puncture intensity requirement of soft-package battery；High temperature resistant：Fusing point>175℃；Meet that above-mentioned condition material may act as manufacture examination Test the candidate material with pricker.
- A kind of 3. insulation pricker for assessing lithium ion battery safety performance as claimed in claim 1, it is characterised in that：In practice Diameter can suitably be increased according to the intensity requirement of material therefor.
- A kind of 4. insulation pricker for assessing lithium ion battery safety performance as claimed in claim 1, it is characterised in that：Total length It can be adjusted on the basis of 110mm according to test case.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390137A (en) * | 2017-08-16 | 2017-11-24 | 中国科学技术大学 | A kind of insulation pricker for assessing lithium ion battery safety performance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390137A (en) * | 2017-08-16 | 2017-11-24 | 中国科学技术大学 | A kind of insulation pricker for assessing lithium ion battery safety performance |
| CN107390137B (en) * | 2017-08-16 | 2023-11-17 | 中国科学技术大学 | Insulation puncture needle for evaluating safety performance of lithium ion battery |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210218 Address after: Room 401, R & D building, Institute of technological innovation, Chinese Academy of Sciences, 2666 Xiyou Road, high tech Zone, Hefei City, Anhui Province, 230088 Patentee after: Anhui Zhongke Jiuan new energy Co.,Ltd. Address before: 230026 Jinzhai Road, Baohe District, Hefei, Anhui Province, No. 96 Patentee before: University of Science and Technology of China |