CN2358558Y - Flexible heat-conducting pad - Google Patents

Flexible heat-conducting pad Download PDF

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Publication number
CN2358558Y
CN2358558Y CN 98249245 CN98249245U CN2358558Y CN 2358558 Y CN2358558 Y CN 2358558Y CN 98249245 CN98249245 CN 98249245 CN 98249245 U CN98249245 U CN 98249245U CN 2358558 Y CN2358558 Y CN 2358558Y
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CN
China
Prior art keywords
utility
power electronic
model
electronic device
heat
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Expired - Fee Related
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CN 98249245
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Chinese (zh)
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姜守仁
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姜守仁
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Priority to CN 98249245 priority Critical patent/CN2358558Y/en
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Publication of CN2358558Y publication Critical patent/CN2358558Y/en
Anticipated expiration legal-status Critical
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Abstract

The utility model relates to a high efficiency heat radiation device used for a power electronic device element, i.e. a flexible heat-conducting pad sheet. The utility model uses the flaky pad sheet made by the special treatment and the processing by swelling graphite. The shape of an outer edge outline is matched with the matchable power electronic device. The outer surfaces of the upper side and the lower side are processed into an indent forming a corrugation shape, so that when the power electronic device is fastened with a heat radiation device, air between the power electronic device and the heat radiation device can be exhausted from the indent, and thus, the contact force is enhanced. The device has the advantages that the heat conductivity and the electric conductivity are good, the utility model has favorable elastic property and flexibility, the performance is stable, the working temperature is high, the radiation is resistant, the corrosion is resistant, the utility model can not pollute environment, the stress is small, the heat balancing performance is good, and the utility model can be widely used for various power type power electronic devices.

Description

Flexible heat conduction pad
The utility model relates to a kind of high-efficiency heat conduction element-flexible heat conduction pad that is used for base plate insulated type electron electric power device.
Along with developing rapidly of information technology and microelectric technique, many device for high-power power electronic arise at the historic moment.For the work temperature rise of just power electronic device unlikely too high, now usually the coating heat-conducting silicone grease impels its radiating and cooling between the insulated type base plate of power electronic device and aluminium section bar radiator, and the problem of its existence is: working temperature generally can not be above 200 ℃; Must select for use the high material of conductive coefficient as filler, the beryllium oxide conductive coefficient is the highest, but toxic, secondly is that boron nitride, cost are expensive, and what cost was low then is the lower aluminium oxide of conductive coefficient.In addition, silicone grease has pollution to environment, after the dust moisture absorption is accumulated on the surface, can cause the components and parts decreased performance; The silicone grease of coating must reach certain thickness, just can plug the gap, and plays radiating effect; And it is big that mechanical fasteners power is wanted, and can produce mechanical stress; After power electronic device heating and cooling, mechanical deformation will be produced with layer between electrode, and buffering can't be obtained for the hard stress between device base plate and the radiator, make the reliability decrease of device; In order to reach contact closely, mechanical engagement tolerance and the welding deformation of machining accuracy and welding module, the granularity of heat-conducting silicone grease etc. to device base plate and aluminium section bar all propose high requirement, thereby the application of power electronic device is restricted, and cost is expensive.Also have and adopt thin copper foil, aluminium foil to make the heat conduction pad, but its material hardness is higher, and there is oxide layer on the surface, radiating effect still owes the strong man meaning.
The purpose of this utility model provides a kind of high efficiency and heat radiation device-flexible heat conduction pad that is used for the heat radiation of insulated type power electronic device, replaces the above-mentioned traditional material-heat-conducting silicone grease that has multinomial defective.
The utility model is achieved in that it is the laminar pad made from the direct press process of expanded graphite, and its outer margin contour shape should match with adaptive electric apparatus spare; Its up and down two side external surfaces answer addition to be the fold-type indenture so that when power electronic device and radiator are fastening, therebetween air can be discharged from indenture and strengthen contact force.
Its outer surface can spray the electric contact surface conditioning agent, to strengthen electrical contact reliability.
The thickness of this pad can be between 0.2~0.8 millimeter.
It can be provided with 0.04~0.08 millimeter Copper Foil in the centre, and adheres to flexible graphite in the two sides of this Copper Foil and constitute.
Basic material of the present utility model is a flexible graphite, and it is after adopting native graphite to add special material to mix, through special chemical treatment such as expanded, according to the overall dimensions laminar pad that hot pressing is processed in mould of power electronic device.Its main feature is as follows: 1, good thermal conductivity and conductivity, and its thermal conductivity and iron are approaching, and resistivity is extremely low.2, better elastic and pliability; Can make with lower pretightning force in the power electronic device of its two sides installation and the minim gap of aluminium section bar radiator or other metal surfaces to obtain filling, contact performance is good, and frictional force is big, resilience force is big, and the loss of bolt torque is little.3, stable performance, the working temperature height; Because of flexible graphite is made up of simple substance carbon, no creep does not have and decomposes, no aging phenomenon, and stable performance, the normal working temperature of using is 200~870 ℃.4, radiation hardness and corrosion resistance are strong: can bear r ray and neutron ray and high dose radiation, corrosion that also can anti-multiple strong corrosive medium.5, cleaning, easy to use does not pollute the environment and electronic circuit, is fit to Fast Installation.6, stress is little, and heat balance is good.Can slow down the stress that produces between contact-making surface because of pretightning force and heater thermal expansion, rapid heat dissipation can make the discharge of scattering rapidly of the high heat of device hot localised points.
Specifically introduce the utility model below in conjunction with drawings and Examples.
Fig. 1 is the embodiment schematic diagram that the utility model is used.
Fig. 2 is the utility model side schematic view.
Fig. 3 is the utility model embodiment (one's) a schematic diagram.
Fig. 4 is the utility model embodiment (twos') a schematic diagram.
The utility model is a kind of high heat conduction pad 1 that is used for the heat radiation of insulated type power electronic device, referring to Fig. 1.It is generally used between power electronic device 2 and the radiator 3, power electronic device 2 is tightened on the surface of radiator 3 by bolt 4,1 on the utility model pad is in this between the two, play making both closely contacts and improve the conductive and heat-conductive effect, thus make power electronic device can be when higher temperature operate as normal.Conductive coefficient K=26W/mk of the present utility model, approaching with iron, more much higher than the conductive coefficient (K=0.9W/mk) of traditional heat-conducting silicone grease.
The utility model adopts flexible graphite to make, elasticity and flexibility with special pearl, its compression ratio>41%, rebound degree>10%, the pretightning force fastening bolt that usefulness is lower just can make between device 2 and the aluminium section bar radiator 3 or the minim gap of metal surface is filled up by the utility model sheet 1, and excellent contact is arranged with contacted material, frictional force is big, and resilience force is big, and the loss of bolt torque is little.Moreover the composition of this pad 1 is a simple substance carbon, and no creep does not have and decomposes, no aging phenomenon, and stable performance, its normal working temperature of using can reach 200~870 ℃.
Referring to Fig. 2, two side external surfaces up and down of the present utility model should be processed into and be the fold-type indenture, thereby form the surface of undaform, so that when fastening, contact-making surface air between itself and device and the radiator can be discharged from this indenture smoothly, fill up the contact-making surface space and make contact tightr, heat-conducting effect is better.The utility model cleaning, easy to use, do not pollute the environment and electronic circuit, install fast and convenient.This pad 1 outer surface can spray the electric contact surface conditioning agent, utilizes tunnel effect, after increase pressure, can reduce contact potential, increases intermolecular infiltration and improves the conductive and heat-conductive ability.Be provided with 0.04~0.08 millimeter copper foil in the middle of the utility model can also be made, and adhere to the enhancement mode pad of flexible graphite in the two sides of this copper foil, it has the characteristics folding, that conductive coefficient is higher that resist.Outer margin contour size of the present utility model should be adaptive with it power electronic device (as CPU, solid-state relay, power module etc.) overall dimension matches, the threaded mounting hole of corresponding match-on criterion again, Fig. 3, the outer shape of two embodiment shown in Figure 4, be respectively strip and rectangular-shaped,, enumerate no longer one by one here because of the profile of power electronic device is ever-changing.
The utility model is manufactured experimently out sample, is applied on the patented product high power solid state relay (patent No. 94204850.5) of our company.What this device adopted is the DCB base plate of direct copper bonding, and for a long time, the frangible base plate that causes of potsherd is by voltage breakdown, and during big electric current operation, problems such as the high efficiency and heat radiation of this solid-state relay can not solve all the time.Its reason is: plastic casing injection moulding distortion is difficult to control, thereby it can not closely be contacted with the aluminium section bar radiator, mechanical fasteners power can not put in place, and the surface irregularity of aluminium section bar radiator, cause itself and solid-state relay to have only local the contact, even the spreading heat-conducting silicone grease uses after the utility model heat conduction pad, the housing of solid-state relay is contacted closely with the aluminium section bar radiator, and both are close in temperature rise; Can be for a long time surpass 200A electric current safe handling (standard is planted the device for 300A), and provide guarantee for the development of 400A solid-state relay.In addition, use HHT higher high tensile fastening this moment again, and ceramics can be not broken easily yet.

Claims (4)

1, a kind of high-efficiency heat conduction element-flexible heat conduction pad that is used for power electronic device, it is characterized in that: it is the laminar pad made from the direct press process of expanded graphite, and its outer margin contour shape should match with adaptive electric apparatus spare; Its up and down two side external surfaces answer addition to be the fold-type indenture so that when power electronic device and radiator are fastening, therebetween air can be discharged from indenture and strengthen contact force.
2, flexible heat conduction pad as claimed in claim 1, it is characterized in that: its outer surface can spray the electric contact surface conditioning agent.
3, flexible heat conduction pad as claimed in claim 1, it is characterized in that: the thickness of this pad can be between 0.2~0.8 millimeter.
4, flexible heat conduction pad as claimed in claim 1 is characterized in that: it can be provided with 0.04~0.08 millimeter Copper Foil in the centre, and adheres to flexible graphite in the two sides of this Copper Foil and constitute.
CN 98249245 1998-12-07 1998-12-07 Flexible heat-conducting pad Expired - Fee Related CN2358558Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 98249245 CN2358558Y (en) 1998-12-07 1998-12-07 Flexible heat-conducting pad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 98249245 CN2358558Y (en) 1998-12-07 1998-12-07 Flexible heat-conducting pad

Publications (1)

Publication Number Publication Date
CN2358558Y true CN2358558Y (en) 2000-01-12

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Application Number Title Priority Date Filing Date
CN 98249245 Expired - Fee Related CN2358558Y (en) 1998-12-07 1998-12-07 Flexible heat-conducting pad

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CN (1) CN2358558Y (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100380087C (en) * 2001-12-13 2008-04-09 先进能源科技公司 Heat dissipating component using high conducting inserts
CN100408963C (en) * 2002-06-28 2008-08-06 先进能源科技公司 Composite heat sink with metal base and graphite fins
CN102555314A (en) * 2011-12-30 2012-07-11 深圳市爱诺菲科技有限公司 SMD (surface mounted device) with cooling and electromagnetic wave absorption functions and preparation method and application thereof
CN104675837A (en) * 2015-02-12 2015-06-03 平湖阿莱德实业有限公司 Graphite composite gasket and production method thereof
CN105658020A (en) * 2014-11-10 2016-06-08 奇鋐科技股份有限公司 Wearable host device with heat radiation structure
CN107041100A (en) * 2015-11-02 2017-08-11 Abb技术有限公司 Power electronics component
WO2019237925A1 (en) * 2018-06-15 2019-12-19 宁波杉越新材料有限公司 Heat-conducting pad and preparation method therefor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100380087C (en) * 2001-12-13 2008-04-09 先进能源科技公司 Heat dissipating component using high conducting inserts
CN100408963C (en) * 2002-06-28 2008-08-06 先进能源科技公司 Composite heat sink with metal base and graphite fins
CN102555314A (en) * 2011-12-30 2012-07-11 深圳市爱诺菲科技有限公司 SMD (surface mounted device) with cooling and electromagnetic wave absorption functions and preparation method and application thereof
CN105658020A (en) * 2014-11-10 2016-06-08 奇鋐科技股份有限公司 Wearable host device with heat radiation structure
CN104675837A (en) * 2015-02-12 2015-06-03 平湖阿莱德实业有限公司 Graphite composite gasket and production method thereof
CN107041100A (en) * 2015-11-02 2017-08-11 Abb技术有限公司 Power electronics component
WO2019237925A1 (en) * 2018-06-15 2019-12-19 宁波杉越新材料有限公司 Heat-conducting pad and preparation method therefor

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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