CN210168380U - Special pulsating heat pipe radiator for high-power-density servo driver - Google Patents
Special pulsating heat pipe radiator for high-power-density servo driver Download PDFInfo
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- CN210168380U CN210168380U CN201920131920.5U CN201920131920U CN210168380U CN 210168380 U CN210168380 U CN 210168380U CN 201920131920 U CN201920131920 U CN 201920131920U CN 210168380 U CN210168380 U CN 210168380U
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Abstract
The utility model provides a special pulsation heat pipe radiator of high power density servo driver for solve among the prior art heat pipe radiator production and the installation degree of difficulty big, the size is difficult to do little, the radiating effect receives the technical problem that heat pipe installation angle influences, include: the device comprises a pulsating heat pipe, an evaporation end substrate, a condensation end substrate and a fixed rod; the evaporation end substrate is provided with an evaporation end channel, and the evaporation end of the pulsating heat pipe is fixed in the evaporation end channel; the substrate at the evaporation end is provided with a fixing hole; the condensation end substrate is provided with a condensation end channel, and the condensation end of the pulsating heat pipe is fixed in the condensation end channel; by implementing the technical scheme of the utility model, the thin-wall pulsating heat pipe is arranged, the coolant can flow automatically, and the radiator can be installed at any angle; the evaporation end substrate, the condensation end substrate and the fixing rod are arranged to fix and protect the pulsating heat pipe, and the fixing through holes are formed, so that the mounting difficulty of the radiator is reduced, and the service life of the radiator is prolonged; the radiator uses a plurality of or double-row pulsating heat pipes, so that the volume of the radiator is reduced.
Description
Technical Field
The utility model relates to a servo motor driver body design field, in particular to special pulsation heat pipe radiator of high power density servo driver.
Background
The high-power density servo driver has the advantages that the size is extremely small, the size is greatly reduced compared with that of a common servo driver or a motor driver body, the power density is multiplied, and when a circuit in the high-power density servo driver is in a high-frequency operation state, a large amount of heat is generated and needs to be dissipated timely to ensure that the temperature of a device is within a safe working range.
In the prior art, a better heat dissipation solution for the high power density servo driver is to use a heat pipe heat dissipation technology. The servo driver can be arranged at various positions and azimuth angles in practical application, and the installation inclination angle of the radiator has great influence on whether the heat pipe can work normally or works in the optimal heat transfer state; the heat pipe is provided with a capillary inner cavity, so that the processing difficulty is higher, higher requirements are provided for installation, and if the pipe is extruded carelessly in the installation process, the capillary damage can be caused; the traditional heat pipe is limited by factors such as manufacturing process, heat transfer effect and the like, and the size and the volume are difficult to be reduced.
Therefore, a pulsating heat pipe radiator which can be installed at any angle, is safe and reliable and has small size is needed.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model discloses a special pulsation heat pipe radiator of high power density servo driver, the technical scheme of the utility model is implemented like this:
a pulsating heat pipe radiator special for a high power density servo driver comprises: the device comprises a pulsating heat pipe, an evaporation end substrate, a condensation end substrate and a fixed rod; the evaporation end substrate is provided with an evaporation end channel, and the evaporation end of the pulsating heat pipe is fixed in the evaporation end channel; the evaporation end substrate is provided with a fixing hole and is fixed on the high-power-density servo driver through the fixing hole; the condensation end substrate is provided with a condensation end channel, and the condensation end of the pulsating heat pipe is fixed in the condensation end channel; the fixing rod is arranged between the evaporation end substrate and the condensation end substrate and used for fixing the relative positions of the evaporation end substrate and the condensation end substrate.
Preferably, the pulsating heat pipe is fixed on the evaporation end substrate and the condensation end substrate in a vacuum brazing mode.
Preferably, the pulsating heat pipe is a double row pipe.
Preferably, the number of the pulsating heat pipe is plural.
Preferably, the fixing rod is made of a heat insulating material.
Preferably, the pulsating heat pipe radiator special for the high-power-density servo driver further comprises a heat exchange substrate, wherein the heat exchange substrate is arranged on the outer side of the evaporation end substrate and is made of a ceramic material with a high heat conductivity coefficient.
Preferably, the number of the evaporation end substrates is 2, and the evaporation ends of the pulsating heat pipe are enclosed in the two evaporation end substrates; the number of the condensation end substrates is 2, and the condensation ends of the pulsating heat pipe are sealed in the two condensation end substrates.
Preferably, the inner diameter of the pipe of the pulsating heat pipe is 0.5-3 mm.
Preferably, the thickness of the evaporation end substrate and the condensation end substrate does not exceed 10 mm.
Preferably, the coolant is one or more selected from water, methanol, ethanol and freon.
The technical scheme of the utility model can solve the technical problems that the production and installation difficulty of the heat pipe radiator is large, the size is difficult to be small, and the heat radiation effect is influenced by the installation angle of the heat pipe in the prior art; by implementing the technical scheme of the utility model, the thin-wall pulsating heat pipe is arranged, the coolant can flow automatically, and the radiator can be installed at any angle; the evaporation end substrate, the condensation end substrate and the fixing rod are arranged to fix and protect the pulsating heat pipe, and the fixing through holes are formed, so that the mounting difficulty of the radiator is reduced, and the service life of the radiator is prolonged; the radiator uses a plurality of pulsating heat pipes or uses double rows of pulsating heat pipes, thereby improving the heat exchange efficiency of the radiator and reducing the volume of the radiator.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a top view of an evaporation end substrate, a condensation end substrate and a fixing member according to embodiments 1, 2, 3 and 4 of the present invention after being connected;
fig. 2 is a schematic structural view of a heat sink according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a pulsating heat pipe according to embodiment 2 of the present invention;
fig. 4 is a schematic structural view of a pulsating heat pipe according to embodiment 3 of the present invention;
fig. 5 is a schematic structural view of a pulsating heat pipe according to embodiment 4 of the present invention.
In the above drawings, the reference numerals denote:
1-pulsating heat pipes; 2-an evaporation end substrate; 3-condensation end substrate; 4-fixing the rod; 5-an evaporation end channel; 6-condensation end channel; 7-fixing holes; 8-inside pulsating heat pipe; 9-outside pulsating heat pipe; 10-lower pulsating heat pipe; 11-upper pulsating heat pipe; 12-heat exchange substrate.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
In a specific embodiment of the present invention, a pulsating heat pipe radiator dedicated for high power density servo driver, as shown in fig. 1 and fig. 2, includes: the device comprises a pulsating heat pipe 1, an evaporation end substrate 2, a condensation end substrate 3 and a fixing rod 4; the evaporation end substrate 2 is provided with an evaporation end channel 5, and the evaporation end of the pulsating heat pipe 1 is fixed in the evaporation end channel 5; the evaporation end substrate 2 is provided with a fixing hole 7, and the evaporation end substrate 2 is fixed on the high-power-density servo driver through the fixing hole 7; the condensation end substrate 3 is provided with a condensation end channel 6, and the condensation end of the pulsating heat pipe 1 is fixed in the condensation end channel 6; the fixing rod 4 is disposed between the evaporation end substrate 2 and the condensation end substrate 3 to fix the relative positions of the evaporation end substrate 2 and the condensation end substrate 3.
The interior of the pulsating heat pipe 1 is in a vacuum environment and is provided with a certain amount of coolant. When the radiator is used, the coolant is heated and then evaporated to generate gas, so that the coolant section and the gas section are randomly distributed in the pulsating heat pipe 1. The evaporation end substrate 2 and the condensation end substrate 3 can be made of metal materials such as aluminum alloy and have good heat conductivity and high structural strength, the outer side of the pulsating heat pipe 1 can be subjected to oxidation treatment or provided with a protective layer, the strength and the corrosion resistance of the pulsating heat pipe 1 are improved, and the overall service life of the device is prolonged. The pulsating heat pipe 1 is a thin-walled pipe, so that the heat exchange speed is effectively increased, the heat dissipation effect is improved, the overall weight of the radiator can be reduced, and the installation and the use of a user are facilitated. The user can set up the pipe diameter and the base plate thickness of pulsation heat pipe 1 according to factors such as system heat dissipation requirement, installation zone size, cost control, improve device compatibility. The evaporation end substrate 2 and the condensation end substrate 3 can be manufactured by using the same template and are matched with the pulsating heat pipe 1 which is symmetrical in structure, so that large-scale production is facilitated, the production efficiency is improved, and the cost of the device is effectively reduced. The diameters of the evaporation end channel 5 and the condensation end channel 6 can be set to be the outer diameter of the pulsating heat pipe 1, so that the evaporation end channel 5 and the condensation end channel 6 can effectively clamp the pulsating heat pipe 1, damage caused by the pulsating heat pipe 1 impacting the surfaces of the evaporation end channel 5 and the condensation end channel 6 due to vibration in the use of the device is reduced, and the service life of the device is prolonged. Connecting structures such as clamping pieces and grooves matched with the pulsating heat pipe 1 can be arranged on the evaporation end channel 5 and the condensation end channel 6, and the position of the pulsating heat pipe 1 is further fixed. In the using process of the radiator, the evaporation end substrate 2 is connected and arranged in a high-temperature area and used for absorbing heat in the high-temperature area, and the condensation end substrate 3 is arranged in a normal-temperature or low-temperature area and used for radiating heat.
The evaporation end of the pulsating heat pipe 1 arranged in the evaporation end substrate 2 absorbs heat from a high-temperature area, a coolant in the evaporation end of the pulsating heat pipe 1 is heated and evaporated to generate gas, the volume of a coolant section is reduced, the volume of a gas section is increased, the gas pressure of the gas section in the evaporation end of the pulsating heat pipe 1 is continuously increased due to low gas density, the coolant section is pushed to flow, correspondingly, the pulsating heat pipe 1 arranged in the condensation end substrate 3 emits heat in a low-temperature environment, the volume of the coolant section in the pulsating heat pipe 1 is continuously increased, the volume of the gas section is continuously reduced, the pressure is continuously reduced, and the coolant section flows to the gas section. The coolant section and the gas section in the pulsating heat pipe 1 are randomly distributed and finally stably flow along a certain direction of the pulsating heat pipe 1. The coolant in the pulsating heat pipe 1 will flow automatically without the assistance of external force. In the prior art, liquid cooling devices or air cooling devices are often equipped with pumps to drive the heat transfer agent. In the specific embodiment, a heat carrier power system is not required to be equipped, a user places the evaporation end substrate 2 of the installed radiator in a high-temperature area, the coolant in the pulsating heat pipe 1 can automatically flow under the temperature difference, additional energy consumption is not required, the maintenance cost of the user is reduced, the structure of the radiator is simplified, and the size of the radiator is favorably reduced. A user sets radiator parameters such as the inner diameter of the pulsating heat pipe 1, the length of the gas section, the length of the coolant section and the type of the coolant through data such as the temperature of the high-temperature region, the temperature of the low-temperature region and the size of the radiating region, so that the radiating effect is optimized, the radiator can be suitable for different environments, and the compatibility of the radiator is improved. The fixing hole 7 can be set as a screw hole, the radiator and the high-power-density servo driver are fixed through the bolts, the installation and the disassembly are easy, the quick installation can be realized, a user can replace or supplement the radiator conveniently, and the maintenance cost of the user is reduced.
The evaporation end substrate 2 and the condensation end substrate 3 can be connected to the fixing rod 4 through detachable connecting pieces such as clamping pieces, screws and bolts, and a user can conveniently select the fixing rod 4 with a proper length according to the size of the evaporation end substrate 2, the size of the condensation end substrate 3 and the size of the pulsating heat pipe 1 so as to be suitable for different heat dissipation environments and improve the compatibility of the radiator. The evaporation end substrate 2 and the condensation end substrate 3 are fixed by the fixing rod 4, the evaporation end substrate 2 and the condensation end substrate 3 can provide better supporting and protecting effects for the pulsating heat pipe 1, so that the pulsating heat pipe 1 can be horizontally placed, and a more appropriate installation angle can be selected according to the requirements of the heat dissipation environment. Because the pulsating heat pipe 1 has a small pipe diameter and small mass of the coolant, the influence of gravity or centripetal force on the cooling effect of the coolant is small, and the radiator can move, vibrate and rotate along with the cooling main body, so that the reliability of the radiator is improved.
In a preferred embodiment, as shown in fig. 1 and 2, the pulsating heat pipe 1 is fixed on the evaporation end substrate 2 and the condensation end substrate 3 by vacuum brazing, so that the connection strength of the pulsating heat pipe 1 with the evaporation end substrate 2 and the condensation end substrate 3 is greatly improved. The installation of the pulsating heat pipe 1 and the filling of the coolant are carried out in advance, and a user can complete the installation only by fixing the radiator on the high-power-density servo driver through the fixing hole 7 on the spot, so that the time cost and the labor cost for installing the radiator are reduced.
In a preferred embodiment, as shown in fig. 1 and 2, the fixing rod 4 is made of a heat insulating material. The fixing rod 4 can be made of high-strength plastic and other materials with poor heat conductivity and high strength, so that the heat insulation area is formed between the condensation end substrate 3 and the heated end substrate while the heat radiator main body is effectively supported, and the heat radiation of the pulsating heat pipe 1 between the evaporation end substrate 2 and the condensation end substrate 3 is reduced, so that the coolant in the pulsating heat pipe 1 is influenced by the self-flowing.
In a preferred embodiment, as shown in fig. 1 and 2, the heat exchange substrate 12 is disposed outside the evaporation end substrate 2 and made of a ceramic material with a high thermal conductivity. The back surface of the evaporation end substrate 2 can be set to be a flat surface, and the evaporation end substrate 2 can uniformly absorb heat from a high-temperature area. The high-power-density servo driver is mainly a circuit board, the surface of the high-power-density servo driver is provided with a plurality of structures such as pins, capacitors, chips and the like and is a non-flat surface, and only part of the high-power-density servo driver is often a heat concentration generation area, so that a heat exchange substrate 12 can be arranged on the outer side of the substrate at the evaporation end. One side of the heat exchange substrate 12 close to the evaporation end substrate is set to be a plane and is attached to the evaporation end substrate 2, and one side of the heat exchange substrate 12 departing from the evaporation end is set according to the surface shape of the attached high-power-density servo driver so as to achieve the optimal heat exchange effect. The heat exchange substrate 12 with different specifications, shapes and materials is replaced, so that the radiator can be suitable for different radiating areas, and the compatibility of the radiator is improved. The heat exchange substrate 12 can be made of an insulating material, so that a short circuit of the radiator is avoided, and the reliability and the safety of the radiator are improved.
In a preferred embodiment, as shown in fig. 1 and fig. 2, the number of the evaporation end substrates 2 is 2, and the evaporation ends of the pulsating heat pipe 1 are enclosed in the two evaporation end substrates 2; the number of the condensation end substrates 3 is 2, and the condensation ends of the pulsating heat pipe 1 are sealed in the two condensation end substrates 3. The protection and support effects of the evaporation end substrate 2 and the condensation end substrate 3 on the pulsating heat pipe 1 are further improved. The fixing holes 7 on the two evaporation end substrates 2 and the two condensation end substrates 3 can be arranged at corresponding positions, the fixing holes 7 corresponding to the substrates after being attached are ensured to be overlapped, compared with the use of one evaporation end substrate 2 and one condensation end substrate 3, only a slightly long bolt needs to be used in the installation process to fix a heat dissipation device, the installation process is simple, the abrasion of the pulsating heat pipe 1 in the use process can be reduced, the service life of the device is prolonged, and the maintenance cost of a user is reduced.
In a preferred embodiment, as shown in FIG. 2, the pulsating heat pipe 1 has a pipe inner diameter of 0.5 to 3 mm. The smaller the inner diameter of the pipeline of the pulsating heat pipe 1 is, the smaller the volume of the coolant which can be accommodated in the pulsating heat pipe 1 is, and the lower the heat exchange capacity of the pulsating heat pipe 1 is; the larger the inner diameter of the pulsating heat pipe 1 is, the larger the volume of the coolant which can be accommodated in the pulsating heat pipe 1 is, and the heat exchange capability of the pulsating heat pipe 1 is improved, but the larger the volume of the coolant is, which is not beneficial to forming a gas segment for isolating the coolant end in the pulsating heat pipe 1 during the evaporation process of the coolant, and may influence the self-flow of the coolant. The user can set up the pipeline internal diameter according to heat dissipation capacity, coolant kind isoparametric, improves the radiator compatibility, improves heat exchange efficiency.
In a preferred embodiment, as shown in fig. 1 and 2, the thickness of the evaporation end substrate 2 and the condensation end substrate 3 does not exceed 10 mm. The thicker the thicknesses of the evaporation end substrate 2 and the condensation end substrate 3 are, the higher the structural strength of the radiator is, and the service life of the radiator is prolonged; the thinner the thickness of the evaporation end substrate 2 and the condensation end substrate 3 is, the faster the heat is transferred into and out of the pulsating heat pipe 1, and the better the heat exchange effect of the heat exchanger is. The user can select the appropriate thickness of the evaporation end substrate 2 and the condensation end substrate 3 according to the parameters of the size of the pulsating heat pipe 1, the type of the heat exchange substrate 12, the installation environment of the radiator, the angle, the weight of the radiator and the like.
In a preferred embodiment, the coolant is one or more selected from water, methanol, ethanol and freon. The types of the coolants are common, the cost reduction of a user is facilitated, and the user can select the appropriate single-component or mixed-component coolant according to parameters such as heat production power of a high-temperature region, temperature upper limit, temperature of a low-temperature region, specification of a radiator, capacity and the like. The user can be based on the radiator model and demarcate the coolant component that different temperatures are suitable for in advance, reduces the time cost and the human cost of radiator installation.
Example 2
In a preferred embodiment, unlike example 1, the pulsating heat pipe 1 is a double row pipe, as shown in fig. 1 and 3. In this specific embodiment, the double-row pipes are arranged in the same plane, and the evaporating end channel 5 and the condensing end channel 6 change the width, so that the double-row pipe type pulsating heat pipe 1 can be applied, the influence on the volumes of the evaporating end substrate 2 and the condensing end substrate 3 is small, but the effective volume in the pulsating heat pipe 1 is increased by nearly one time, the heat exchange efficiency of the radiator is effectively improved, the radiator with smaller volume is convenient to manufacture, and the compatibility of the radiator is improved. In the application process of the radiator, the area of the heated end of the inner pulsating heat pipe 8 is small, the temperature of the inner pulsating heat pipe 8 is lower than that of the outer pulsating heat pipe 9, the temperature difference between the evaporation end and the condensation end of the pulsating heat pipe 1 is increased, the flowing speed of a coolant is favorably improved, and the heat exchange efficiency is improved.
Example 3
Different from the embodiment 2, as shown in fig. 1 and fig. 4, the structure of the double-row pipe is set as the upper layer and the lower layer, the cooling channel and the evaporation end channel 5 increase the depth, the double-row pipe can be installed, the areas of the condensation end substrate 3 and the evaporation end substrate 2 do not need to be changed, the capacity of the coolant is increased by nearly one time, and the heat exchange efficiency is greatly improved. In the using process of the radiator, the evaporation end of the lower pulsating heat pipe 10 is closer to the evaporation end substrate 2, the temperature of the coolant in the lower pulsating heat pipe 10 is relatively higher, the temperature of the upper pulsating heat pipe 11 is relatively lower, and the temperature difference between the lower pulsating heat pipe 10 and the upper pulsating heat pipe 11 can generate larger gas pressure difference, so that the automatic flowing speed of the coolant can be improved, and the heat exchange efficiency can be improved.
Example 4
In a preferred embodiment, as shown in fig. 1 and 5, unlike example 3, the number of pulsating heat pipes 1 is plural, and plural pulsating heat pipes 1 are stacked. The evaporation ends of the pulse heat pipes 1 which are stacked in a plurality of layers can be vertically close to a high-temperature area in the using process, the pulse heat pipes are suitable for installing a high-power-density servo driver with a small bottom area and a high height above the high-power-density servo driver, the compatibility of the radiator is improved, the pulse heat pipes 1 can be set to be of the same specification, and the large-scale production of the radiator is facilitated.
It should be understood that the above description is only exemplary of the present invention, and is not intended to limit the present invention, and that any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (10)
1. A special pulsating heat pipe radiator for a high-power-density servo driver is characterized by comprising:
the device comprises a pulsating heat pipe, an evaporation end substrate, a condensation end substrate and a fixed rod; wherein the content of the first and second substances,
the evaporation end substrate is provided with an evaporation end channel, and the evaporation end of the pulsating heat pipe is fixed in the evaporation end channel; the evaporation end substrate is provided with a fixing hole and is fixed on the high-power-density servo driver through the fixing hole;
the condensation end substrate is provided with a condensation end channel, and the condensation end of the pulsating heat pipe is fixed in the condensation end channel;
the fixing rod is arranged between the evaporation end substrate and the condensation end substrate and used for fixing the relative positions of the evaporation end substrate and the condensation end substrate.
2. The pulsating heat pipe radiator for high power density servo driver as recited in claim 1, wherein said pulsating heat pipe is fixed on said evaporation end substrate and said condensation end substrate by vacuum brazing.
3. The pulsating heat pipe radiator special for high power density servo driver as claimed in claim 2, wherein said pulsating heat pipe is a double row pipe.
4. The pulsating heat pipe radiator dedicated to high power density servo driver as claimed in claim 2, wherein the number of pulsating heat pipes is plural.
5. The pulsating heat pipe radiator as claimed in any one of claims 2 and 3, wherein said fixing rod is made of a heat insulating material.
6. The pulsating heat pipe radiator as claimed in claim 5, further comprising a heat exchange substrate, wherein said heat exchange substrate is disposed outside said evaporation end substrate and made of a ceramic material with high thermal conductivity.
7. The pulsating heat pipe radiator special for the high power density servo driver as recited in claim 6, wherein the number of said evaporation end substrates is 2, and the evaporation ends of said pulsating heat pipes are enclosed in two said evaporation end substrates; the number of the condensation end substrates is 2, and the condensation ends of the pulsating heat pipe are sealed in the two condensation end substrates.
8. The pulsating heat pipe radiator special for the high power density servo driver as recited in claim 7, wherein the inner diameter of the pipe of said pulsating heat pipe is 0.5-3 mm.
9. The pulsating heat pipe radiator of claim 8, wherein the thickness of said evaporation end substrate and said condensation end substrate is not more than 10 mm.
10. The pulsating heat pipe radiator for the high power density servo driver as claimed in claim 9, wherein said pulsating heat pipe contains a coolant, and the coolant is one selected from water, methanol, ethanol, freon.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920131920.5U CN210168380U (en) | 2019-01-25 | 2019-01-25 | Special pulsating heat pipe radiator for high-power-density servo driver |
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| CN201920131920.5U CN210168380U (en) | 2019-01-25 | 2019-01-25 | Special pulsating heat pipe radiator for high-power-density servo driver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109729701A (en) * | 2019-01-25 | 2019-05-07 | 岩熔之光智能科技(上海)有限公司 | A kind of dedicated pulsating heat pipe radiator of high power density servo-driver |
| WO2022211201A1 (en) * | 2021-03-30 | 2022-10-06 | Korea Advanced Institute Of Science And Technology | Pulsating heat pipe-based battery cooling module and battery unit including the same |
-
2019
- 2019-01-25 CN CN201920131920.5U patent/CN210168380U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109729701A (en) * | 2019-01-25 | 2019-05-07 | 岩熔之光智能科技(上海)有限公司 | A kind of dedicated pulsating heat pipe radiator of high power density servo-driver |
| WO2022211201A1 (en) * | 2021-03-30 | 2022-10-06 | Korea Advanced Institute Of Science And Technology | Pulsating heat pipe-based battery cooling module and battery unit including the same |
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