CN209845583U - Double-sided heat dissipation device and inverter - Google Patents
Double-sided heat dissipation device and inverter Download PDFInfo
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- CN209845583U CN209845583U CN201821989990.6U CN201821989990U CN209845583U CN 209845583 U CN209845583 U CN 209845583U CN 201821989990 U CN201821989990 U CN 201821989990U CN 209845583 U CN209845583 U CN 209845583U
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 70
- 238000001816 cooling Methods 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000005494 condensation Effects 0.000 claims abstract description 24
- 238000009833 condensation Methods 0.000 claims abstract description 24
- 238000001704 evaporation Methods 0.000 claims abstract description 23
- 230000008020 evaporation Effects 0.000 claims abstract description 22
- 238000012546 transfer Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 2
- 239000011800 void material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 7
- 239000002826 coolant Substances 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 4
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- 230000007547 defect Effects 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 239000004020 conductor Substances 0.000 description 1
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- 230000004907 flux Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
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- 238000004377 microelectronic Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
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- 239000002210 silicon-based material Substances 0.000 description 1
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- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The utility model provides a two-sided heat abstractor and dc-to-ac converter. The double-sided heat abstractor is used for carrying out the double-sided heat dissipation for flat double-sided heat conduction's power device, includes: the flat heat pipe comprises an evaporation section and a condensation section, the evaporation section is used for absorbing heat to convert the liquid working medium into a gaseous working medium, and the condensation section is used for emitting heat to convert the gaseous working medium into the liquid working medium; and the water cooling plate comprises a device heat dissipation section and a heat pipe heat dissipation section, the evaporation section of the flat heat pipe and the device heat dissipation section of the water cooling plate are respectively contacted with two sides of the power device to absorb the heat of the power device, and the heat pipe heat dissipation area of the water cooling plate is contacted with the condensation section of the flat heat pipe to absorb the heat of the condensation section of the flat heat pipe.
Description
Technical Field
The utility model relates to a heat abstractor especially relates to a be used for carrying out two-sided radiating two-sided heat abstractor for flat two-sided heat conduction's power device.
Background
With the development of integration technology and microelectronic packaging technology, the total power density of electronic components is increasing, the physical sizes of electronic components and electronic devices are gradually tending to miniaturization and miniaturization, and the generated heat is rapidly accumulated, so that the heat flux density around the integrated devices is also increasing, therefore, the high-temperature environment will affect the performance of the electronic components and devices, and a more efficient heat control scheme is needed. Therefore, the problem of heat dissipation of electronic components has evolved into a large focus of current electronic component and electronic device manufacturing.
Currently, in some high power modules, water-cooled plates may be used to dissipate heat. In the vehicle-mounted inverter, if the ceramic-based copper-clad plate on the upper layer of the double-sided water-cooling module chip forms a second heat dissipation channel, namely, the two packaging plates of the double-sided water-cooling module can conduct heat for heat generated inside the module, the heat dissipation device can also be arranged on the two sides of the double-sided water-cooling module, so that the heat dissipation performance of the double-sided water-cooling module can be effectively improved. However, the conventional heat dissipation scheme of the double-sided water-cooling module is to use two-sided water-cooling heat dissipation, that is, two water-cooling plates are disposed on two sides of the double-sided water-cooling module to respectively dissipate heat from two sides of the double-sided water-cooling module. As is known, the water-cooling plate is prone to cause non-uniformity of heat dissipation effect due to the unidirectional fluidity of the cooling liquid, and is prone to cause local temperature high points, which is not favorable for the safety of the power device, and therefore a heat dissipation scheme with better temperature uniformity needs to be provided for the power device.
The flat heat pipe has the advantages of light weight, good starting performance and temperature uniformity, and is a hotspot research direction in the aspect of heat dissipation of the conventional electronic element, and at present, the flat heat pipe is only applied in the field of battery heat dissipation.
Therefore, it is desirable to provide a device capable of uniformly dissipating heat from both sides of a high power device.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned defect, the utility model aims to provide an utilize dull and stereotyped heat pipe to evenly dispel the heat for two-sided power device, avoid simultaneously to set up a heat abstractor for dull and stereotyped heat pipe very much.
According to the utility model discloses an aspect provides a two-sided heat abstractor for carry out two-sided heat dissipation for flat two-sided heat conduction's power device, include:
the flat heat pipe comprises an evaporation section and a condensation section, wherein the evaporation section is used for absorbing heat to convert the liquid working medium into a gaseous working medium, and the condensation section is used for emitting heat to convert the gaseous working medium into the liquid working medium; and the water cooling plate comprises a device heat dissipation section and a heat pipe heat dissipation section, the evaporation section of the flat heat pipe and the device heat dissipation section of the water cooling plate are respectively contacted with two sides of the power device to absorb the heat of the power device, and the heat pipe heat dissipation area of the water cooling plate is contacted with the condensation section of the flat heat pipe to absorb the heat of the condensation section of the flat heat pipe.
Further, the device heat dissipation section of the water cooling plate is thinner than the heat pipe heat dissipation section to form a gap with the evaporation section of the flat heat pipe for arranging the power device.
Further, the flat heat pipe comprises a plurality of steam channels for transferring gaseous working medium from the evaporation section to the condensation section, and the plurality of steam channels comprise wire mesh wicks therein for transferring liquid working medium from the condensation section to the evaporation section.
Furthermore, a plurality of grooves are further formed in the periphery of the plurality of steam channels, and the wire mesh wicks cover the plurality of grooves.
Further, the cross sections of the grooves are in an inverted trapezoid shape.
Further, the plurality of steam channels are spaced at 4 millimeters intervals.
Further, the power device is in contact with the flat heat pipe, the power device is in contact with the device heat dissipation area and/or the heat pipe heat dissipation area is in contact with the flat heat pipe through a heat conduction pad.
Further, the water-cooled plate has finned channels.
Further, the power device is a double-sided water cooling module.
According to an aspect of the present invention, there is provided an inverter, including a power device and a double-sided heat dissipation device for the power device to dissipate heat.
The flat heat pipe and the water cooling plate are respectively arranged on the two sides of the device to be cooled, so that the purpose of double-sided heat dissipation of the device to be cooled is achieved, and the effects of balanced heat dissipation and increased heat conduction efficiency are further achieved; meanwhile, the water cooling plate is used for radiating heat for the condensation section of the flat heat pipe, so that the effect that a heat radiating device is not required to be additionally arranged for the condensation section of the flat heat pipe is achieved, and the production cost is greatly saved; the liquid absorption core is arranged in the flat heat pipe to achieve the effect of accelerating the flow of the working medium so as to accelerate the heat conduction rate; the grooves are arranged around the steam channel in the flat heat pipe, so that the heat dissipation area of the flat heat pipe is increased; the heat dissipation area of the flat heat pipe is further increased by arranging the inverted trapezoidal grooves at the periphery of the steam channel in the flat heat pipe, and the heat conduction speed is accelerated; the fins are arranged inside the water cooling plate, so that the heat conduction rate is increased; by arranging the heat conducting pad between the heat-radiated device and the flat heat pipe and/or between the heat-radiated device and the water cooling plate and/or between the flat heat pipe and the water cooling plate, the contact thermal resistance between the heat-radiated device and the flat heat pipe and/or between the heat-radiated device and the water cooling plate and/or between the flat heat pipe and the water cooling plate is reduced.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings.
Fig. 1 is a schematic physical diagram of a double-sided heat sink according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a double-sided heat sink according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating a vapor channel of a flat heat pipe in a double-sided heat dissipation device according to an embodiment of the present invention.
For clarity, a brief description of the reference numerals is given below:
100 double-sided heat dissipation devices;
110 flat heat pipes;
111 an evaporation section;
112 a condensation section;
120 water-cooled plate;
121 a device heat dissipation section;
122 heat pipe heat dissipation section;
123 liquid inlet;
124 liquid outlet;
130 a heat-dissipating device;
210 a steam channel;
211 a wire mesh wick;
213 a heat conductive pad;
221 a thermal pad;
222 liquid inlet flow channel;
223 liquid outlet flow passage;
224 a fin;
225 a fin;
311 grooves.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be understood as imposing any limitation on the scope of the present invention.
Because the radiating scheme of current for two-sided heat conduction device sets up the water-cooling board respectively on two sides of two-sided heat conduction device, and the water-cooling board has relatively poor temperature uniformity because of the one-way mobility of its coolant liquid, and the radiating effect can constantly worsen along with the thermal continuous accumulation of cooling liquid in the runner, consequently for improving by the radiating equilibrium of heat dissipation device, according to the utility model discloses an aspect provides a two-sided heat abstractor for carry out two-sided heat dissipation for the power device of the two-sided heat conduction of platyzization.
The flattening refers to that the shape of the power device is flattened, and the power device has two relatively flat opposite planes so as to be clamped in a gap of the double-sided heat dissipation device. The double-sided heat conduction means that the two planes are made of materials capable of conducting heat, so that the double-sided heat conduction device provided by the scheme is in contact with the two planes capable of conducting heat respectively to absorb heat.
Be two-sided heat-conducting device by the heat abstractor, realization that two-sided heat-conducting device can maximize the utility model provides a two-sided heat abstractor's radiating effect. However, in this case, only one side of the double-sided heat dissipation device is used for dissipating heat of the device to be dissipated, so the heat dissipation effect cannot meet the expectation of the original design of the present invention on double-sided heat dissipation.
In one embodiment, as shown in fig. 1, the double-sided heat dissipation device 100 includes a flat heat pipe 110 and a water cooling plate 120.
The flat heat pipe 110 utilizes evaporation cooling, so that the temperature difference between two ends of the flat heat pipe 110 is large, and heat can be conducted quickly. The flat heat pipe 110 is pumped to a negative pressure state and filled with a proper working medium, and the working medium has a low boiling point and is easy to volatilize after absorbing heat.
It can be understood that the working medium with different working temperatures can be selected according to different applications of the device to be cooled, for example, when the double-sided heat dissipation module in the inverter is used for heat dissipation, the working medium in the flat heat pipe 110 can be selected to be working medium with a working temperature of 35 ℃ to 100 ℃.
It can be understood that depending on the choice of the working medium material in the flat heat pipe 110, the flat heat pipe may also be made of a material having a high thermal conductivity coefficient compatible with the working medium, thereby reducing the thermal resistance between the working medium and the flat heat pipe housing.
The flat-plate heat pipe 110 generally includes an evaporation section 111 and a condensation section 112. The evaporator end 111 is generally the area that comes into contact with the heat-dissipated device 130 for absorbing heat from the heat-dissipated device. For the same flat heat pipe 110, the region and position of the evaporation section 111 are not fixed, but the working medium inside the flat heat pipe is mainly in liquid state, and the region where the liquid working medium absorbs the heat of the heat dissipation device and evaporates, converts into gaseous working medium and transfers to the condensation area is called as the evaporation section. Correspondingly, the area and position of the condensing section 112 are not fixed, but the working medium inside the flat heat pipe is mainly gaseous working medium, and the gaseous working medium is condensed in the area, radiates heat, liquefies the gaseous working medium into liquid working medium, and transfers to the evaporating section 111, which is called as the condensing section.
The inside of the water-cooling plate 120 is filled with a cooling liquid, and the cooling liquid flows through a flow passage inside the water-cooling plate 120 to continuously absorb heat. The water-cooled plate 120 includes a device heat-dissipating section 121 and a heat pipe heat-dissipating section 122. The device heat dissipation section 121 is in contact with the heat-dissipated device 130 for absorbing heat of the heat-dissipated device 130. The heat pipe heat sink section 122 is in contact with the condenser section 112 of the flat-plate heat pipe 110 to absorb heat from the condenser section 112 of the flat-plate heat pipe 110.
It can be understood that the specific heat capacity of the coolant inside the water-cooling plate 120 is greater than the specific heat capacity of the working medium filled inside the flat heat pipe 110, so that even though the water-cooling plate 120 and the flat heat pipe 110 absorb the heat of the device 130 to be cooled at the same time, the temperature of the gaseous working medium inside the condensation section 112 of the flat heat pipe 110 is much higher than the temperature of the coolant inside the water-cooling plate 120, and therefore, even though the coolant after absorbing the heat of the device 130 to be cooled still has a temperature lower than the temperature of the working medium inside the flat heat pipe 110, the heat can be dissipated to the condensation section 112 of the flat heat pipe 110.
It can be understood that, since the water-cooling plate 120 needs to be in contact with the flat heat pipe 110 and the heat-dissipated device 130, there may be a thickness difference between the device heat dissipation section 121 of the water-cooling plate 120 and the heat pipe heat dissipation section 122, that is, the thickness of the device heat dissipation section 121 is thinner than that of the heat pipe heat dissipation section 122, so that the device heat dissipation section 121 of the water-cooling plate 120 is disposed opposite to the evaporation section 111 of the flat heat pipe 110 and a certain gap exists for disposing the heat-dissipated device 130.
Because the working medium in the flat heat pipe 110 has the starting temperature, when the device 130 to be cooled works in a low-temperature environment or is in a low-power operation state, the flat heat pipe 110 is not started, and the device to be cooled is cooled only by the water cooling plate 120; when the power of the device to be cooled is increased, the surface temperature is increased, or the environmental temperature is increased to reach the working temperature range of the working medium, the flat heat pipe starts to work, and the cooling efficiency of the device to be cooled is increased.
It can be understood that the double-sided heat dissipation device 100 formed by combining the flat heat pipe 110 and the water cooling plate 120 can enhance the heat dissipation capability and expand the working range of the heat dissipation device. Meanwhile, the good balanced heat dissipation performance of the flat heat pipe can also ensure that no high temperature point exists on the surface of the heat-dissipated device, and further ensure the safety and reliability of the heat-dissipated device.
To describe the internal configuration of the flat heat pipe 110 and the water-cooled plate 120 in further detail, the double-sided heat dissipation apparatus 100 is cut along line AB in fig. 1, and the cross-section of the flat heat pipe 110, the water-cooled plate 120 and the heat-dissipated device 130 is shown in fig. 2.
The interior of flat-plate heat pipe 110 includes a plurality of parallel vapor channels 210 to facilitate the transfer of gaseous working fluid from evaporator section 111 to condenser section 112. The vapor channels 210 are uniformly and radially distributed inside the flat heat pipe 110, and are as close as possible to the outer surface of the flat heat pipe 110 to reduce the thermal resistance between the flat heat pipe 110 and the heat-dissipated device 130 and the water cooling plate 120.
It is understood that the number of vapor channels in the flat heat pipe 110 may be set differently according to the size of the heat-dissipating device.
It is understood that, in order to increase the heat conduction performance of the flat heat pipe 110, the intervals between the vapor channels 210 are reduced as much as possible to increase the volume of the vapor channels 210. In a preferred embodiment, the steam channels 210 are spaced 4 mm apart.
Preferably, the vapor channels 210 include a wire mesh wick 211 around the periphery thereof, and the wire mesh wick 211 is made of a porous material and has a capillary force for facilitating the flow of the liquid. When the evaporation section 111 of the flat heat pipe 110 is heated, the liquid working medium in the wire mesh liquid absorption core 211 is rapidly evaporated, the gaseous working medium flows to the other end, namely the condensation section 112, under a slight pressure difference, and is cooled at the condensation section to release heat, and is condensed into liquid again, and the liquid working medium flows back to the evaporation section 111 along the wire mesh liquid absorption core 211 under the action of capillary force.
By the cooperation of the vapor channels 210 and the working mechanism of the wire mesh wick 211, heat is continuously transferred from the evaporation section 111 to the condensation section 112, and thus is circulated. With this rapid cycling, heat can be conducted away from the heat source.
Preferably, the vapor channel 210 includes a plurality of grooves around the periphery thereof, and the wire-mesh wick 211 covers the grooves, and the grooves increase the heat exchange area of the flat heat pipe 110, thereby increasing the heat exchange efficiency.
It is understood that the grooves may be of any regular geometric shape, such as square, rectangular or diamond, or of any irregular shape, etc.
In a more preferred embodiment, as shown in fig. 3, the cross section of the grooves 311 of the steam channel 210 is inverted trapezoid, and the longer bottom edge of the grooves 311 is close to the outer surface of the flat heat pipe 110, so as to further increase the heat exchange area between the steam channel 210 and the heat-dissipated device 130 or the water-cooled plate 120.
In a preferred simple embodiment, the water-cooled plate 120 has a one-way C-shaped flow channel, as shown in FIG. 1, the water-cooled plate 120 has a liquid inlet 123 and a liquid outlet 124. As shown in fig. 2, the liquid inlet 123 forms a liquid inlet flow passage 222 inside the water-cooled plate, and the liquid outlet 124 forms a liquid outlet flow passage 223 inside the water-cooled plate. Preferably, the liquid inlet channel 222 is divided into a plurality of fins 224, the liquid outlet channel 223 is divided into a plurality of fins 225, and the fins 224, 225 increase the heat dissipation area of the liquid in the liquid inlet channel 222 and the liquid outlet channel 223 and the heat dissipation device 130 or the flat heat pipe 110.
It should be understood that although the water cooling plate in the present application uses a unidirectional C-shaped flow channel with fins, in other embodiments, the water cooling plate may also use S-shaped flow channels with fins or other shapes, and only the number of fins inside the flow channel needs to be changed.
It can be understood that, although 7 fins are respectively illustrated in the liquid inlet channel 222 and the liquid outlet channel 223 of the water cooling plate 120 shown in fig. 2, the number of fins in the channel of the water cooling plate 120 may vary according to the shape and width of the channel.
It can be understood by those skilled in the art that due to the defects of the existing manufacturing process, even if the flat heat pipe 110 and the water cooling plate 120 are made of good heat conductive materials such as aluminum, steel or aluminum alloy, the phenomena that the heat conduction is not facilitated due to the unevenness or gaps and the like existing in the respective planes when in contact with each other are unavoidable, and thus, the heat dissipated by the device, the flat heat pipe or the water cooling plate mutually has unavoidable contact thermal resistance. In order to reduce the contact thermal resistance, the heat-dissipated device 130 and the flat heat pipe 110 and/or the heat-dissipated device 130 and the water-cooled plate 120 and/or the flat heat pipe 110 and the water-cooled plate 120 may be in contact through a thermal pad. The heat conducting pad can be an additive which takes an organic silicon material as a matrix and has a good auxiliary heat conducting function, so that good heat conductivity is achieved.
Preferably, the heat-dissipated device 130 and the flat heat pipe 110 and/or the heat-dissipated device 130 and the water-cooled plate 120 and/or the flat heat pipe 110 and the water-cooled plate 120 may be contacted by a thin thermal pad, such as a 0.5 mm thermal pad, which preferably has good compression resilience, so that the heat-dissipated device 130 and the flat heat pipe 110 and/or the heat-dissipated device 130 and the water-cooled plate 120 and/or the flat heat pipe 110 and the water-cooled plate 120 can be tightly attached.
It is understood that the heat-dissipated device 130 may be a double-sided water-cooled module existing in an inverter.
According to an aspect of the present invention, there is provided an inverter, comprising a power device and a double-sided heat dissipation device for dissipating heat of the power device in any of the above embodiments.
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. It is to be understood that the scope of the invention is to be defined by the appended claims and not by the specific constructions and components of the embodiments illustrated above. Those skilled in the art can make various changes and modifications to the embodiments within the spirit and scope of the present invention, and such changes and modifications also fall within the scope of the present invention.
Claims (10)
1. A double-sided heat sink for double-sided heat dissipation of a flat, double-sided thermally conductive power device, comprising:
the flat heat pipe comprises an evaporation section and a condensation section, wherein the evaporation section is used for absorbing heat to convert the liquid working medium into a gaseous working medium, and the condensation section is used for emitting heat to convert the gaseous working medium into the liquid working medium; and
the water-cooling plate, the water-cooling plate includes device radiating section and heat pipe radiating section, the evaporation zone of dull and stereotyped heat pipe with the device radiating section of water-cooling plate with the both sides of power device contact respectively in order to absorb the heat of power device, the heat pipe radiating area of water-cooling plate with the condensation segment contact of dull and stereotyped heat pipe is in order to absorb the heat of the condensation segment of dull and stereotyped heat pipe.
2. The dual sided heat dissipation device of claim 1, wherein the device heat dissipation section of the water cooled plate is thinner than the heat pipe heat dissipation section to form a void with an evaporation section of the flat plate heat pipe for disposing the power device.
3. The dual-sided heat dissipation device of claim 1, wherein the flat-plate heat pipe comprises a plurality of vapor channels for the transfer of gaseous working fluid from the evaporator section to the condenser section, and wherein the plurality of vapor channels comprise wire mesh wicks therein for the transfer of liquid working fluid from the condenser section to the evaporator section.
4. The dual-sided heat dissipation device of claim 3, wherein the plurality of vapor channels further comprise a plurality of grooves around the perimeter, and wherein the wire mesh wick covers the plurality of grooves.
5. The double-sided heat sink of claim 4, wherein the plurality of grooves have an inverted trapezoidal cross-section.
6. The dual sided heat sink of claim 3, wherein the plurality of vapor channels are spaced apart by 4 millimeters.
7. The dual-sided heat dissipation device of claim 1, wherein the power device is in contact with the flat-plate heat pipe, the power device is in contact with the device heat dissipation area, and/or the heat pipe heat dissipation area is in contact with the flat-plate heat pipe via a thermal pad.
8. The double-sided heat sink of claim 1, wherein the water-cooled plate has finned channels.
9. The double-sided heat dissipation device of claim 1, wherein the power device is a double-sided water-cooled module.
10. An inverter, characterized by comprising a power device and the double-sided heat dissipation device according to any one of claims 1 to 9 for dissipating heat of the power device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821989990.6U CN209845583U (en) | 2018-11-29 | 2018-11-29 | Double-sided heat dissipation device and inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821989990.6U CN209845583U (en) | 2018-11-29 | 2018-11-29 | Double-sided heat dissipation device and inverter |
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| Publication Number | Publication Date |
|---|---|
| CN209845583U true CN209845583U (en) | 2019-12-24 |
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| CN201821989990.6U Active CN209845583U (en) | 2018-11-29 | 2018-11-29 | Double-sided heat dissipation device and inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111246706A (en) * | 2018-11-29 | 2020-06-05 | 湖南中车时代电动汽车股份有限公司 | Double-sided heat dissipation device |
-
2018
- 2018-11-29 CN CN201821989990.6U patent/CN209845583U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111246706A (en) * | 2018-11-29 | 2020-06-05 | 湖南中车时代电动汽车股份有限公司 | Double-sided heat dissipation device |
| CN111246706B (en) * | 2018-11-29 | 2024-04-26 | 湖南中车时代电动汽车股份有限公司 | Double-sided heat dissipation device |
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Address after: No. 268 Longxing Road, Tianyuan District, Zhuzhou City, Hunan Province 412007 Patentee after: Zhongche Times Electric Vehicle Co.,Ltd. Country or region after: China Address before: Zone 57, Liyu Industrial Park, Zhuzhou national high tech Development Zone, Zhuzhou City, Hunan Province, 412007 Patentee before: HUNAN CRRC TIMES ELECTRIC VEHICLE Co.,Ltd. Country or region before: China |
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Effective date of registration: 20240912 Address after: No. 201, R&D Building, Phase 2.1 A, Xinma Power Innovation Park, No. 899 Xianyue Ring Road, Majiahe Street, Tianyuan District, Zhuzhou City, Hunan Province, 412000 Patentee after: Hunan CRRC Commercial Vehicle Power Technology Co.,Ltd. Country or region after: China Address before: No. 268 Longxing Road, Tianyuan District, Zhuzhou City, Hunan Province 412007 Patentee before: Zhongche Times Electric Vehicle Co.,Ltd. Country or region before: China |