CN204857845U - Lithium ion battery secure architecture - Google Patents
Lithium ion battery secure architecture Download PDFInfo
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- CN204857845U CN204857845U CN201520587050.4U CN201520587050U CN204857845U CN 204857845 U CN204857845 U CN 204857845U CN 201520587050 U CN201520587050 U CN 201520587050U CN 204857845 U CN204857845 U CN 204857845U
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- 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 utility model relates to an energy storage device field especially relates to a lithium ion battery secure architecture, including utmost point ear, heat -conducting part and temperature fuse, the temperature fuse includes the input, the output, hold thermistor's thermistor component and heat acceptance division, input and output and the thermistor who holds inside the thermistor component constitute current circuit, the heat acceptance division sets up on the thermistor component, the heat -conducting part can be by lithium ion battery's internal resorption heat, and transmit to the heat acceptance division, the one end of utmost point ear stretches into lithium ion battery's inside, the other end is connected with the input. The utility model provides a lithium ion battery secure architecture can be direct with inside heat transfer to the temperature fuse of lithium ion battery through the heat -conducting part for the temperature fuse can in time play a role when the inside high temperature of battery, has effectively avoided because of crossing the problem that leads to lithium ion battery superheated damage such as fill.
Description
Technical field
The utility model relates to energy storage device field, particularly relates to a kind of safety structure of lithium ion battery.
Background technology
Lithium ion battery have energy density high, have extended cycle life, the plurality of advantages such as environmental friendliness and renewable product, be widely used in all kinds of consumption electronic product.But remain to overcharge security performance that (Overcharge) is representative the significant challenge that lithium ion battery faces.The current lithium ion battery over-charge safety performance that improves mainly comprises chemistry improvement and physics improvement; the former sets out at main chemically system; as higher in adopted structural stability; the cathode material that heat release oxygen release is less, adds anti-over-charging additive etc. in the electrolytic solution, barrier film processes oxidation-resistant ceramic etc.; the latter is mainly by welding temperature fuse (Thermal-CutOff; TCO) as safety guard, after heat reaches certain value, circuit is cut off, the fail safe of protection battery.
In correlation technique, the operation principle of Thermal Cutoffs is as follows: the heat of battery surface (being generally the closedtop region of battery) can be passed to inner thermistor by Thermal Cutoffs fully, when lithium ion battery due to the reason such as to overcharge and temperature is too high time, the resistance of thermistor just can sharply increase, and then reaches the effect cutting off electric current.
But the origin of heat of battery is in inside, and the Thermal Cutoffs in correlation technique can only obtain the heat of battery surface.Compare internal heat, it is significantly cut down, and therefore often causes Thermal Cutoffs can not play a role in time when internal temperature of battery is too high, cannot effectively avoid battery to cross the problem of cause thermal damage.
Utility model content
The utility model provides a kind of safety structure of lithium ion battery, can effectively prevent battery from crossing cause thermal damage.
The utility model provides a kind of safety structure of lithium ion battery, comprise lug, heat-conducting part and Thermal Cutoffs, described Thermal Cutoffs comprises input, output, be contained with thermistor element and the heat acceptance division of thermistor, described input and described output are all connected with described thermistor element, and form series circuit with the thermistor being contained in described thermistor element inside, described heat acceptance division is arranged on described thermistor element, and the heat of described thermistor element outside can be passed to thermistor, described heat-conducting part is connected with described heat acceptance division, and can by the absorbed inside heat of lithium ion battery, and be passed to described heat acceptance division, one end of described lug extend into the inside of described lithium ion battery, the other end is connected with described input.
Preferably, described heat-conducting part is connected with described lug, and obtains the heat of inside lithium ion cell by described lug.
Preferably, the described heat-conducting part metal material that is insulating heat-conduction material or is connected with described lug by thermal plastic insulation.
Preferably, described heat-conducting part and the stacked setting of described lug,
Described Thermal Cutoffs also comprises conducting strip, and described heat-conducting part is connected with described heat acceptance division by described conducting strip.
Preferably, described conducting strip is metal conducting strip, alloy conducting strip, heat-conducting cream sheet, heat conduction film or heat-conducting double-sided film, and conductive coefficient is greater than 85W/mK.
Preferably, described heat-conducting part is connected with the sidepiece of described lug, and along perpendicular to described lug length direction away from described lug, described heat-conducting part is directly connected with described heat acceptance division.
Preferably, described heat-conducting part is connected by insulating heat-conductive adhesive tape or heat conduction glue with described heat acceptance division.
Preferably, described heat acceptance division protrudes the side of the described thermistor element at its place.
Preferably, described heat acceptance division protrudes the side 0.1-0.5mm of the described thermistor element at its place.
Preferably, the side that described thermistor element is provided with described heat acceptance division is fixed on the closedtop region of lithium ion battery.
The technical scheme that the utility model provides can reach following beneficial effect:
The heat of inside lithium ion cell directly can be passed to Thermal Cutoffs by heat-conducting part by safety structure of lithium ion battery provided by the utility model, avoid the problem that the heat existing for the mode of lithium ion battery surface acquisition heat is significantly cut down, Thermal Cutoffs can be played a role in time when internal temperature of battery is too high, effectively prevent and cause lithium ion battery to cross the problem of cause thermal damage because to overcharge etc.
Should be understood that, it is only exemplary that above general description and details hereinafter describe, and can not limit the utility model.
Accompanying drawing explanation
The structural representation that the heat-conducting part that Fig. 1 provides for the utility model embodiment is connected with lug sidepiece;
The structural representation of the safety structure of lithium ion battery that Fig. 2 forms with the Thermal Cutoffs with conducting strip for structure shown in Fig. 1;
The structural representation of the heat-conducting part that Fig. 3 provides for the utility model embodiment and the stacked setting of lug;
The structural representation of the Thermal Cutoffs with conducting strip that Fig. 4 provides for the utility model embodiment;
The structural representation of the safety structure of lithium ion battery that Fig. 5 forms for structure shown in Fig. 3 and Fig. 4;
The temperature of the safety structure of lithium ion battery that Fig. 6 provides for experimental example 1 and comparative example and electric current change curve in time.
Reference numeral:
10-lug;
20-heat-conducting part;
30-Thermal Cutoffs;
300-input; 302-output; 304-thermistor element; 306-heat acceptance division; 308-conducting strip.
Accompanying drawing to be herein merged in specification and to form the part of this specification, shows and meets embodiment of the present utility model, and is used from specification one and explains principle of the present utility model.
Embodiment
Also by reference to the accompanying drawings the utility model is described in further detail below by specific embodiment."front", "rear" described in literary composition, "left", "right", " on ", D score all with the laying state of the safety structure of lithium ion battery in accompanying drawing for reference.
As shown in Fig. 1 to 5, the utility model embodiment provides a kind of safety structure of lithium ion battery, comprises lug 10, heat-conducting part 20 and Thermal Cutoffs 30.Thermal Cutoffs 30 comprises input 300, output 302, the thermistor element 304 being contained with thermistor and heat acceptance division 306, input 300 and output 302 are separately positioned on the two ends of thermistor element 304, and form series circuit with the thermistor being contained in thermistor element 304 inside.Heat acceptance division 306 is arranged on thermistor element 304, and its effect the heat of thermistor element 304 outside can be passed to thermistor.
Heat-conducting part 20, as the primary structure of transferring heat, directly can obtain the heat of inside lithium ion cell, instead of is obtained by the surface of lithium ion battery, and heat-conducting part 20 also needs to be connected with heat acceptance division 306.Compared to heat by lithium ion battery internal delivery to surface process, heat-conducting part 20 possesses larger conductive coefficient, so just can by the heat obtained by inside lithium ion cell when lose less be passed on heat acceptance division 306.
Lug 10 is as main conductive component, and its one end extend into the inside of lithium ion battery, and the other end is connected with input 300.
Like this, the safety structure of lithium ion battery that the present embodiment provides can form two cover transmission lines respectively.Wherein, heat-conducting part 20, heat acceptance division 306 and thermistor element 304 form heat conducting circuit jointly, make heat via the internal delivery of lithium ion battery to thermistor element 304.Lug 10, input 300, thermistor element 304 and output 302 then form conducting wire jointly, enable lithium ion battery carry out the transmission of electric current via this conducting wire.When the heat of inside lithium ion cell increases, heat can be passed on the thermistor of thermistor element 304 inside with less loss, the resistance of thermistor is raised, and then conducting wire is interrupted.This mode makes Thermal Cutoffs can play a role in time when internal temperature of battery is too high, effectively prevent lithium ion battery overheated because the reason such as overcharging, so smolder, on fire and burning and the problem damaged.
Although Thermal Cutoffs can be made to play a role more timely by the direct mode obtaining inside lithium ion cell heat of heat-conducting part 20 in the present embodiment, if but the structure that extend into inside lithium ion cell were directly increased on the basis of existing lithium ion battery structure, but could cause the reduction of battery energy density.
Consider that the lug 10 in correlation technique generally all adopts metal material, these materials have inherently possessed good heat conductivility, therefore can play the requirement heat of inside lithium ion cell being passed in low-loss situation lithium ion battery outside completely.In this case, the heat-conducting part 20 in the present embodiment can directly be connected with lug 10, is obtained the heat of inside lithium ion cell by lug 10.In order to prevent electric current from transmitting via heat-conducting part 20, heat-conducting part 20 is preferably insulating heat-conduction material, or adopts metal material, but is connected with lug 10 by thermal plastic insulation.
Heat-conducting part 20 and lug 10 can have multiple connected mode, such as the sidepiece of heat-conducting part 20 with lug 10 is connected, heat-conducting part 20 is extended (see Fig. 1) along perpendicular to lug 10 length direction to the side away from lug 10 simultaneously, until heat-conducting part 20 is near heat acceptance division 306 away from one end of lug 10, by modes such as bending, bendings, heat-conducting part 20 is directly connected (see Fig. 2) with heat acceptance division 306 afterwards.In this connected mode, heat-conducting part 20 can directly be connected with heat acceptance division 306, and the loss in heat transfer process is less.But the structure of heat-conducting part 20 is comparatively complicated, adds technology difficulty.Be connected with heat acceptance division 306 for the ease of heat-conducting part 20, preferably heat acceptance division 306 protruded the side 0.1-0.5mm of the thermistor element 304 at its place.
Heat-conducting part 20 and lug 10 also can adopt another kind of connected mode, and part layer heat-conducting part 20 and lug 10 being exposed lithium ion battery stacks to be put, and adopt welding or the mode such as bonding to be fixed (see Fig. 3).This structure can reduce the structure complexity of lithium ion battery outside, make the profile of battery more succinct, but because heat-conducting part 20 can not extend near heat acceptance division 306, therefore need on Thermal Cutoffs 30, arrange a conducting strip 308 (see Fig. 4), make heat-conducting part 20 indirectly be connected (see Fig. 5) by conducting strip 308 with heat acceptance division 306.If adopt conducting strip 308, in order to be reduced in the thermal losses in transmittance process as far as possible, conducting strip 308 preferably selects metal conducting strip, alloy conducting strip, heat-conducting cream sheet, heat conduction film or heat-conducting double-sided film, ensures that conductive coefficient is greater than 85W/mK.
No matter which kind of connected mode, in order to prevent electric current to be transmitted by heat conducting circuit further, is connected preferably by insulating heat-conductive adhesive tape or heat conduction glue between heat-conducting part 20, heat acceptance division 306 and conducting strip 308.
After heat-conducting part 20 has been connected with Thermal Cutoffs 30, position each other is preferably fixed, in order to avoid connecting portion departs from, affects the transmission of heat.But, in use may there is flatulence distortion in lithium ion battery, extruding is produced to surrounding objects and causes displacement, being out of shape to prevent lithium ion battery flatulence makes the position of Thermal Cutoffs 30 move, in the present embodiment, the side preferably thermistor element 304 of Thermal Cutoffs 30 being provided with heat acceptance division 306 is fixed on the closedtop region (packaging area between positive and negative electrode lug and battery main body) of lithium ion battery.Lithium ion battery is when dilatancy, and the deformation in closedtop region is minimum, can ensure that the position of heat acceptance division 306 does not change substantially like this, effectively prevent connecting portion from departing from.
Be described in detail below by the performance of specific experiment to the safety structure of lithium ion battery that the application provides:
1, experiment sample makes
Experimental example 1
(battery is thick: 6mm, wide: 50mm, long: 88mm), anode active material is graphite, and Copper Foil does collector, and formula of size is: graphite: Super-P: CMC: SBR=91: 3: 3: 3 to adopt 556580 size battery.Cathode active material is cobalt acid lithium (LCO), and aluminium foil does collector, and formula of size is LCO: SP: PDVF=95.8: 2.1: 2.1, and lithium ion battery first discharge capacity is 4Ah (35 DEG C of 0.5C electric discharge).Adopt the safety structure of lithium ion battery shown in Fig. 2, wherein, lug 10 and heat-conducting part 20 all adopt aluminium, and heat-conducting part 20 is bonding with lug 10 by thermal plastic insulation, and lug 10 is positive pole ear.
Experimental example 2
Be with the difference of experimental example 1: the heat-conducting part 20 taked is copper material.
Experimental example 3
Be with the difference of experimental example 1: the heat-conducting part 20 taked is silver-colored material.
Experimental example 4
Be with the difference of experimental example 1: adopt the safety structure of lithium ion battery shown in Fig. 5, the conducting strip 308 adopted is aluminium.
Experimental example 5
Be with the difference of experimental example 4: the conducting strip 308 taked is copper material.
Experimental example 6
Be with the difference of experimental example 4: the conducting strip 308 taked is silver-colored material.
Experimental example 7
Be with the difference of experimental example 1: lug 10 is negative lug.
Comparative example
Be with the difference of experimental example 1: adopt the safety structure of lithium ion battery obtaining battery surface heat.
2, test sample
Carry out 0.8C10V to experimental example 1-7 and comparative example respectively and overcharge test, test result is as shown in table 1:
Table 1
| Experimental example 1 | Experimental example 2 | Experimental example 3 | Experimental example 4 | Experimental example 5 | Experimental example 6 | Experimental example 7 | Comparative example | |
| Test number | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Catch fire number | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
| Percent of pass | 100％ | 100％ | 100％ | 100％ | 100％ | 100％ | 100％ | 20％ |
Find after tested, the safety structure of lithium ion battery of the different structure that the application provides and material all presents 100% percent of pass, and the percent of pass of comparative example is only 20%, show that safety structure of lithium ion battery that the application proposes to improve significantly effect to improving lithium ion battery over-charge safety performance tool.
Accompanying drawing 6 with experimental example 1 and comparative example for comparing, monitor the temperature of safety structure of lithium ion battery and the electric current variation tendency with the charging interval, can see, comparatively comparative example is fast for the temperature rise rate of experimental example 1, when the charging interval reaches about 93min, surface temperature exceeds nearly 20 DEG C than comparative example, in addition in experimental example 1, the triggered time of safety structure of lithium ion battery also shifts to an earlier date about 40s than comparative example, above 2 have significant benefit for overcharging and testing, safety structure of lithium ion battery advancement can be made, cut off circuit and then avoid that thermal runaway appears in lithium ion battery and ignition even explodes.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a safety structure of lithium ion battery, is characterized in that, comprises lug, heat-conducting part and Thermal Cutoffs,
Described Thermal Cutoffs comprises input, output, the thermistor element being contained with thermistor and heat acceptance division,
Described input and described output are all connected with described thermistor element, and form series circuit with the thermistor being contained in described thermistor element inside, described heat acceptance division is arranged on described thermistor element, and the heat of described thermistor element outside can be passed to thermistor
Described heat-conducting part is connected with described heat acceptance division, and by the absorbed inside heat of lithium ion battery, and can be passed to described heat acceptance division,
One end of described lug extend into the inside of described lithium ion battery, and the other end is connected with described input.
2. safety structure of lithium ion battery according to claim 1, is characterized in that, described heat-conducting part is connected with described lug, and obtains the heat of inside lithium ion cell by described lug.
3. safety structure of lithium ion battery according to claim 2, is characterized in that, the metal material that described heat-conducting part is insulating heat-conduction material or is connected with described lug by thermal plastic insulation.
4. the safety structure of lithium ion battery according to Claims 2 or 3, is characterized in that, described heat-conducting part and the stacked setting of described lug,
Described Thermal Cutoffs also comprises conducting strip, and described heat-conducting part is connected with described heat acceptance division by described conducting strip.
5. safety structure of lithium ion battery according to claim 4, is characterized in that, described conducting strip is metal conducting strip, alloy conducting strip, heat-conducting cream sheet, heat conduction film or heat-conducting double-sided film, and conductive coefficient is greater than 85W/mK.
6. the safety structure of lithium ion battery according to Claims 2 or 3, it is characterized in that, described heat-conducting part is connected with the sidepiece of described lug, and along perpendicular to described lug length direction away from described lug, described heat-conducting part is directly connected with described heat acceptance division.
7. safety structure of lithium ion battery according to claim 6, is characterized in that, described heat-conducting part is connected by insulating heat-conductive adhesive tape or heat conduction glue with described heat acceptance division.
8. safety structure of lithium ion battery according to claim 6, is characterized in that, described heat acceptance division protrudes the side of the described thermistor element at its place.
9. safety structure of lithium ion battery according to claim 8, is characterized in that, described heat acceptance division protrudes the side 0.1-0.5mm of the described thermistor element at its place.
10. the safety structure of lithium ion battery according to any one of claims 1 to 3, is characterized in that, the side that described thermistor element is provided with described heat acceptance division is fixed on the closedtop region of lithium ion battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520587050.4U CN204857845U (en) | 2015-08-06 | 2015-08-06 | Lithium ion battery secure architecture |
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| CN201520587050.4U CN204857845U (en) | 2015-08-06 | 2015-08-06 | Lithium ion battery secure architecture |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755633A (en) * | 2018-12-14 | 2019-05-14 | 惠州市豪鹏科技有限公司 | A kind of lithium ion battery |
| CN109786880A (en) * | 2019-01-23 | 2019-05-21 | 成都市银隆新能源产业技术研究有限公司 | A method of test internal temperature of battery |
| CN109950642A (en) * | 2017-12-21 | 2019-06-28 | 宁德新能源科技有限公司 | A kind of battery core and battery |
| CN110071255A (en) * | 2018-01-23 | 2019-07-30 | 宁德新能源科技有限公司 | Battery core and battery |
| WO2021000781A1 (en) * | 2019-07-01 | 2021-01-07 | 宁德时代新能源科技股份有限公司 | Secondary battery |
-
2015
- 2015-08-06 CN CN201520587050.4U patent/CN204857845U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950642A (en) * | 2017-12-21 | 2019-06-28 | 宁德新能源科技有限公司 | A kind of battery core and battery |
| CN110071255A (en) * | 2018-01-23 | 2019-07-30 | 宁德新能源科技有限公司 | Battery core and battery |
| CN109755633A (en) * | 2018-12-14 | 2019-05-14 | 惠州市豪鹏科技有限公司 | A kind of lithium ion battery |
| CN109786880A (en) * | 2019-01-23 | 2019-05-21 | 成都市银隆新能源产业技术研究有限公司 | A method of test internal temperature of battery |
| CN109786880B (en) * | 2019-01-23 | 2023-11-10 | 成都市银隆新能源产业技术研究有限公司 | Method for testing internal temperature of battery |
| WO2021000781A1 (en) * | 2019-07-01 | 2021-01-07 | 宁德时代新能源科技股份有限公司 | Secondary battery |
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