WO2020137698A1 - Heat management system - Google Patents

Abstract

A heat management system to manage heat from a heat generating body (12) that generates heat along with charging and discharging or with power conversion comprises a liquid heat transport medium (14) that transports heat received from the heat generating body and a circuit (20) through which the heat transport medium flows. The circuit has a heat exchanger (22) that discharges heat from the heat transport medium to outside of the circuit by way of exchanging heat between the heat transport medium and a heat exchange medium, and a reserve tank (23) that stores the heat transport medium. A removal section by which gas generated from the heat transport medium is removed to outside of the circuit is formed in a portion of the circuit.

Description

Heat management system Cross-reference to related application

This application is based on Japanese Patent Application No. 2018-243348 filed on Dec. 26, 2018, the content of which is incorporated herein by reference.

This disclosure relates to thermal management systems.

Patent Document 1 describes a system for cooling an engine. This system includes an engine, cooling water that cools the engine, a radiator that radiates the cooling water, and a reservoir tank that stores the cooling water.

JP, 2008-62893, A

By the way, the present inventor has found that the following problems occur in a heat management system that manages heat of a heating element that generates heat due to charge/discharge or power conversion. The system includes a liquid heat transport medium that transports heat received from a heating element, and a circuit through which the heat transport medium flows. This circuit has a heat exchanger that radiates heat from the heat transport medium by heat exchange with the heat exchange medium, and a reservoir tank that stores the heat transport medium. The inside of the reservoir tank is sealed to prevent leakage of the heat transport medium.
In this system, gas may be generated from the heat exchange medium. For example, when the heat transport medium contains water and the part of the heat exchanger that comes into contact with the heat exchange medium is made of aluminum, the part of the heat exchanger that comes into contact with the heat exchange medium contains water and hydrogen gas. Occurs. Further, as another example, when the heat transport medium contains an organic solvent, the organic solvent may be vaporized to generate a gas. The generated gas accumulates inside the reservoir tank. As a result, the pressure inside the reservoir tank rises. Therefore, the deterioration of the reservoir tank is accelerated.

The present disclosure aims to provide a heat management system capable of suppressing accelerated deterioration of a reservoir tank.

In order to achieve the above object, according to one aspect of the present disclosure,
The thermal management system that manages the heat of the heating element that generates heat with discharge or power conversion,
A liquid heat transport medium that transports the heat received from the heating element,
A circuit through which the heat transport medium flows,
The circuit is
A heat exchanger that releases heat of the heat transport medium to the outside of the circuit by heat exchange between the heat transport medium and the heat exchange medium,
Having a reservoir tank for storing the heat transport medium,
A part of the circuit is formed with an extraction part for extracting the gas generated from the heat transport medium to the outside of the circuit.

According to this, the gas generated from the heat transport medium can be extracted by the extraction unit. Therefore, it is possible to prevent the gas generated from the heat exchange medium from accumulating in the reservoir tank and increasing the internal pressure of the reservoir tank. Therefore, it is possible to prevent the deterioration of the reservoir tank from accelerating.

Note that the reference numerals in parentheses attached to the respective components and the like indicate an example of a correspondence relationship between the components and the like and specific components and the like described in the embodiments described later.

It is a schematic diagram which shows the whole structure of the thermal management system in 1st Embodiment. It is sectional drawing of the reservoir tank in 1st Embodiment. It is an enlarged view of the III section in FIG. It is a sectional view of a part of reservoir tank in a 2nd embodiment. It is sectional drawing of the reservoir tank in 3rd Embodiment. It is sectional drawing of the reservoir tank in 4th Embodiment. It is a sectional view of a part of reservoir tank in a 5th embodiment. It is a partial external view of the hose in 6th Embodiment. It is a partial external view of the hose in 7th Embodiment.

Hereinafter, an embodiment of the present disclosure will be described based on the drawings. In each of the following embodiments, the same or equivalent parts are designated by the same reference numerals in the drawings for the purpose of simplifying the description.

(First embodiment)
The thermal management system 10 shown in FIG. 1 is mounted on an electric vehicle. In the following, the thermal management system 10 will simply be referred to as the system 10. An electric vehicle obtains a driving force for traveling the vehicle from an electric motor for traveling. Examples of electric vehicles include electric vehicles, plug-in hybrid vehicles, fuel cell vehicles, two-wheeled electric vehicles, and the like. The number of wheels of the electric vehicle and the vehicle application are not limited. An electric vehicle is equipped with a traveling electric motor, a battery, and an inverter. In a fuel cell vehicle, a fuel cell is mounted on the vehicle.

An electric motor for traveling is a motor generator that converts the electric power supplied from the battery into driving force for traveling the vehicle, and also converts the power of the vehicle into electric power during deceleration. The traveling electric motor generates heat as power and electric power are converted.

The battery is a battery for running the vehicle that supplies electric power to the electric motor for running. The battery charges electric power from the electric motor for traveling when the vehicle decelerates. The battery can be charged with electric power supplied from an external power source (that is, a commercial power source) when the vehicle is stopped. The battery generates heat as it is charged and discharged.

　The inverter is a power conversion device that converts the electric power supplied from the battery to the electric motor for running to direct current to alternating current. Further, the inverter converts the electric power charged from the traveling electric motor into the battery from AC to DC. The inverter generates heat as power is converted.

The fuel cell converts the chemical energy of the fuel into electric power by an electrochemical reaction. Fuel cells generate heat as fuel is converted to electric power.

As shown in FIG. 1, the system 10 includes a heating element 12, a heat transport medium 14, and a circuit 20. The heating element 12 generates heat with charge/discharge or power conversion. The heating element 12 is the above-mentioned battery, fuel cell, inverter or motor generator.

The heat transport medium 14 is liquid and transports the heat received from the heating element 12. The heat transport medium 14 contains a liquid base material and an orthosilicate ester, and does not contain an ionic rust preventive agent.

The base material is a base material of the heat transport medium 14. The liquid base material means that it is in a liquid state in use. Water to which a freezing point depressant is added is used as the base material. Water is used because it has a large heat capacity, is inexpensive, and has low viscosity. The freezing point depressant is added to water in order to ensure the liquid state even when the environmental temperature is below freezing. The freezing point depressant dissolves in water and lowers the freezing point of water. As the freezing point depressant, an organic alcohol such as alkylene glycol or its derivative is used. As the alkylene glycol, for example, monoethylene glycol, monopropylene glycol, polyglycol, glycol ether and glycerin are used alone or as a mixture. The freezing point depressant is not limited to organic alcohols, and inorganic salts and the like may be used.

The orthosilicate ester is a compound for giving the heat transport medium 14 a function of rust prevention. Since the orthosilicate ester is contained in the heat transport medium 14, the heat transport medium 14 has a function of rust prevention. Therefore, the heat transport medium 14 may not include the ionic rust preventive agent.

As the orthosilicate ester, a compound represented by the general formula (I) is used.

　一般式（Ｉ）において、置換基Ｒ^１～Ｒ^４は、同じ又は異なり、かつ、炭素数１～２０のアルキル置換基、炭素数２～２０のアルケニル置換基、炭素数１～２０のヒドロキシアルキル置換基、置換又は非置換の炭素数６～１２のアリール置換基及び／又は式－（ＣＨ_２－ＣＨ_２－Ｏ）ｎ－Ｒ^５のグリコールエーテル－置換基を表す。Ｒ^５は、水素又は炭素数１～５のアルキルを表す。ｎは、１～５の数を表す。

In the general formula (I), the substituents R ¹ to R ⁴ are the same or different and are an alkyl substituent having 1 to 20 carbon atoms, an alkenyl substituent having 2 to 20 carbon atoms, and a hydroxyalkyl having 1 to 20 carbon atoms. It represents a substituent, a substituted or unsubstituted aryl substituent having 6 to 12 carbon atoms and/or a glycol ether-substituent of the formula —(CH ₂ —CH ₂ —O)nR ⁵ . R ⁵ represents hydrogen or alkyl having 1 to 5 carbons. n represents a number of 1 to 5.

Typical examples of orthosilicates are pure tetraalkoxysilanes such as tetramethoxysilane, tetraethoxysilane, tetra(n-propoxy)silane, tetra(isopropoxy)silane, tetra(n-butoxy)silane, tetra. (T-butoxy)silane, tetra(2-ethylbutoxy)silane, or tetra(2-ethylhexoxy)silane, and further tetraphenoxysilane, tetra(2-methylphenoxy)silane, tetravinyloxysilane, tetraallyloxysilane, Tetra(2-hydroxyethoxy)silane, tetra(2-ethoxyethoxy)silane, tetra(2-butoxyethoxy)silane, tetra(1-methoxy-2-propoxy)silane, tetra(2-methoxyethoxy)silane or tetra[2-methoxyethoxy)silane 2-[2-(2-methoxyethoxy)ethoxy]ethoxy]silane.

As the orthosilicate ester, in the general formula (I), the substituents R ¹ to R ⁴ are the same, and an alkyl substituent having 1 to 4 carbon atoms or a formula-(CH2-CH2-O)nR It represents a ⁵ glycol ether substituent, R ⁵ is hydrogen, methyl or ethyl, n represents preferably a compound which represents the number 1, 2 or 3 is used.

The orthosilicic acid ester is contained in the heat transport medium 14 so that the concentration of silicon in the whole heat transport medium 14 is 1 to 10000 mass ppm. The concentration of this silicon is preferably 1 mass ppm or more and 2000 mass ppm or less. The concentration of this silicon is preferably higher than 2000 mass ppm and 10000 mass ppm or less. The above-mentioned orthosilicic acid esters are commercially available or can be prepared by simply transesterifying 1 equivalent of tetramethoxysilane with 4 equivalents of the corresponding long-chain alcohol or phenol and distilling off the methanol.

Since the heat transport medium 14 does not contain an ionic rust inhibitor, the conductivity of the heat transport medium 14 is lower than that when the heat transport medium contains an ionic rust inhibitor. The conductivity of the heat transport medium 14 is 50 μS/cm or less, and preferably 1 μS/cm or more and 5 μS/cm or less. For reference, as a heat transport medium containing a liquid base material containing water and an ionic rust preventive agent, there is engine cooling water used for cooling a vehicle engine. The conductivity of engine cooling water is 4000 μS/cm or more. As described above, the heat transport medium containing an ionic anticorrosive agent for rust prevention has high electric conductivity and does not have electric insulation.

Note that the heat transport medium 14 may include an azole derivative as a rust preventive agent in addition to the orthosilicate ester.

The circuit 20 has a heat receiving portion 21, a heat exchanger 22, a reservoir tank 23, a pump 24, and a hose 25.

The heat receiving part 21 causes the heat transport medium 14 to receive heat from the heating element 12. The heat receiving part 21 is configured by a flow path that flows adjacent to the heating element 12. Heat is transferred from the heat generating body 12 to the heat transport medium 14 via the members constituting the heat receiving portion 21.

The heat exchanger 22 releases heat of the heat transport medium 14 to the outside of the circuit 20 by heat exchange between the heat transport medium 14 and the heat exchange medium. The heat exchange medium is air, oil or a refrigeration cycle refrigerant.

The reservoir tank 23 is a tank that stores the heat transport medium 14. The pump 24 is a fluid machine that sends the heat transport medium 14. The hose 25 is a flow passage forming portion that connects the heat receiving portion 21, the heat exchanger 22, and the reservoir tank 23, which are circuit components that form the circuit 20, to each other and forms a flow passage through which the heat transport medium 14 flows.

The heat transport medium 14 circulates in the circuit 20 by the operation of the pump 24. In the heat receiving part 21, the heat transport medium 14 receives the heat of the heating element. In the heat exchanger 22, the heat of the heat transport medium 14 is released. As a result, the heating element 12 is cooled.

In the present embodiment, the portion of the heat exchanger 22 that comes into contact with the heat transport medium 14 is made of a member containing aluminum. The heat transport medium 14 contains water. Therefore, hydrogen gas is generated in the portion of the heat exchanger 22 that comes into contact with the heat transport medium 14 due to the electrochemical reaction of water. In view of this, in the present embodiment, the reservoir tank 23 is provided with an extracting portion for extracting hydrogen gas generated from the heat transport medium 14 to the outside of the circuit 20.

As shown in FIG. 2, the reservoir tank 23 has a tank body 231 and a lid 232. A tank space 233 that stores the heat transport medium 14 is formed inside the tank body 231. The heat transport medium 14 is stored inside the tank body 231. The lid 232 closes the opening 234 of the tank body 231.

The tank body portion 231 has a side wall portion 235, a bottom wall portion 236, and an upper wall portion 237. The side wall portion 235 extends in the vertical direction. The bottom wall portion 236 is continuous with the lower end of the side wall portion 235. The upper wall portion 237 is continuous with the upper end of the side wall portion 235.

Further, as shown in FIG. 3, the tank main body 231 has a first wall portion 31 and a second wall portion 32. The first wall portion 31 forms a tank space 233. The second wall portion 32 forms a tank space 233 together with the first wall portion 31. The first wall portion 31 is a part of the tank body portion 231. The second wall portion 32 is another portion of the tank body portion 231, and is a portion having a smaller surface area facing the tank space 233 than the first wall portion 31. In addition, in the present embodiment, the second wall portion 32 is located on the side wall portion 235. However, the second wall portion 32 may be located on the upper wall portion 237.

The first wall portion 31 and the second wall portion 32 have the same thickness. The hydrogen gas permeability coefficient of the second wall portion 32 is larger than the hydrogen gas permeability coefficient of the first wall portion 31 when compared at the same thickness. Therefore, the second wall portion 32 has a higher hydrogen gas permeability than the first wall portion 31. As a material forming the first wall portion 31, for example, polypropylene which is a synthetic resin is used. As the material forming the second wall portion 32, for example, polypropylene having crystallinity lower than that of the polypropylene forming the first wall portion 31 is used.

As described above, in the present embodiment, the reservoir wall 23, which is a part of the circuit 20, is provided with the second wall portion 32 as an extracting portion for extracting the hydrogen gas generated from the heat transport medium 14. According to this, the hydrogen gas inside the reservoir tank 23 can be extracted from the second wall portion 32 to the outside of the circuit 20. Therefore, it is possible to prevent the internal pressure of the reservoir tank 23 from rising due to the accumulation of hydrogen gas generated from the heat transport medium 14 in the reservoir tank 23. Therefore, it is possible to prevent the deterioration of the reservoir tank 23 from accelerating.

Also, the heat transport medium 14 contains an orthosilicate ester and does not contain an ionic rust inhibitor. Therefore, as compared with the case where the heat transport medium 14 contains an ionic anticorrosive agent, the conductivity of the heat transport medium 14 can be lowered. Therefore, by using the heat transport medium 14 having a low conductivity, it is possible to avoid the occurrence of liquid drop when the leaked heat transport medium 14 contacts the heating element 12.

(Second embodiment)
In this embodiment, a part of the configuration of the reservoir tank 23 is different from that of the first embodiment. Other configurations of the system 10 are the same as those in the first embodiment.

As shown in FIG. 4, the tank body portion 231 has a first wall portion 33 and a second wall portion 34. The first wall portion 33 and the second wall portion 34 correspond to the first wall portion 31 and the second wall portion 32 of the first embodiment, respectively.

The first wall portion 33 and the second wall portion 34 are made of the same synthetic resin material, for example, polypropylene having high crystallinity. The thickness of the second wall portion 34 is smaller than the thickness of the first wall portion 33. In other words, when the hydrogen gas diffuses inside the second wall portion 34 in the thickness direction of the second wall portion 34, the diffusion distance of the hydrogen gas is the first wall portion 33 in the thickness direction of the first wall portion 33. Is smaller than the diffusion distance of hydrogen gas when the hydrogen gas diffuses inside. As a result, the second wall portion 34 has higher hydrogen gas permeability than the first wall portion 33.

Also in the present embodiment, as in the first embodiment, the reservoir tank 23 is formed with the second wall portion 34 as an extracting portion for extracting hydrogen gas. Therefore, according to this embodiment, the same effect as that of the first embodiment is obtained. If the diffusion distance of the second wall portion 34 is smaller than that of the first wall portion 33 and the permeability of hydrogen gas is higher, the material forming the second wall portion 34 is made of the first wall portion 33. It may be different from the material constituting the.

(Third Embodiment)
In this embodiment, a part of the configuration of the reservoir tank 23 is different from that of the first embodiment. Other configurations of the system 10 are the same as those in the first embodiment.

As shown in FIG. 5, a convex shaped portion 35 is formed on the side wall portion 235 of the tank main body portion 231. The convex portion 35 has a convex shape toward the inside of the reservoir tank 23. The entire tank body 231 is made of the same synthetic resin material, for example, polypropylene having high crystallinity.

In the present embodiment, the surface area of the inner surface of the side wall portion 235 is increased compared to the case where the inner surface of the side wall portion 235 facing the tank space 233 is flat, which is indicated by the alternate long and short dash line in FIG. When materials having the same gas permeability per unit area are compared, the larger the contact area of hydrogen gas, the larger the amount of hydrogen gas permeation. Therefore, the permeation amount of hydrogen gas in the convex portion 35 is larger than the permeation amount of hydrogen gas in the flat portion 36 shown by the alternate long and short dash line in FIG.

According to this, the hydrogen gas inside the reservoir tank 23 can be positively extracted from the convex portion 35 to the outside of the reservoir tank 23. Therefore, according to this embodiment, the same effect as that of the first embodiment is obtained. In the present embodiment, the convex portion 35 corresponds to the extraction portion that extracts hydrogen gas.

Note that the convex portion 35 may be convex toward the outside of the reservoir tank 23. Further, the convex portion 35 may be formed on a portion of the side wall portion 235 different from the portion shown in FIG. Further, the convex portion 35 may be formed on the upper wall portion 237. In a general tank, a convex portion is formed on the bottom wall portion of the tank for the purpose of improving the strength of the tank, but the convex portion is not formed on the side wall portion or the upper wall portion of the tank.

(Fourth Embodiment)
In this embodiment, a part of the configuration of the reservoir tank 23 is different from that of the first embodiment. Other configurations of the system 10 are the same as those in the first embodiment.

As shown in FIG. 6, a hole 41 penetrating the upper wall portion 237 of the tank body portion 231 is formed. The hole 41 is located above the liquid surface of the heat transport medium 14 in the tank body 231. The hole 41 constitutes a gas passage through which hydrogen gas flows from the tank space 233 to the outside of the reservoir tank 23.

According to this embodiment, the hydrogen gas inside the reservoir tank 23 can be extracted from the hole 41 to the outside of the reservoir tank 23. Therefore, according to this embodiment, the same effect as that of the first embodiment is obtained. In the present embodiment, the hole 41 corresponds to the extracting portion for extracting hydrogen gas. The hole 41 may be formed in the side wall portion 235 at a position above the liquid surface of the heat transport medium 14. The hole 41 may be formed in the lid 232.

(Fifth Embodiment)
In this embodiment, a part of the configuration of the reservoir tank 23 is different from that of the first embodiment. Other configurations of the system 10 are the same as those in the first embodiment.

As shown in FIG. 7, the tank body 231 has an opening forming portion 238 that forms an opening 234. The opening forming portion 238 has a tubular shape and extends upward from the upper wall portion 237.

The lid portion 232 has an inserted portion 261 that is inserted into the opening 234. The inserted portion 261 extends in one direction. Two O-rings 262 and 263 are attached to the inserted portion 261. The O-rings 262 and 263 are packings that prevent the heat transport medium 14 from leaking between the opening forming portion 238 and the lid portion 232.

A gap 42 through which hydrogen gas can pass is formed between the two O-rings 262 and 263 and the inner wall of the opening forming portion 238 when the inserted portion 261 is inserted into the opening 234. The size of the gap 42 is set so that the heat transport medium 14 does not pass therethrough, as described below. When the heating element 12 is cooled, the heat transport medium is pressurized by the operation of the pump 24. The pressure difference between the inside and the outside of the reservoir tank 23 in this pressure state determines whether or not the heat transport medium 14 passes through the gap 42. Therefore, in this pressure state, the size of the gap 42 is set so that the hydrogen gas passes through the gap 42 and a pressure loss of a magnitude that does not allow the heat transport medium 14 to pass through the gap 42 is generated in the gap 42. ..

Also, a gap 43 through which hydrogen gas can pass is formed between the opening forming portion 238 and a portion of the lid portion 232 excluding the two O-rings 262. These gaps 42 and 43 form a gas passage through which hydrogen gas flows from the tank space 233 to the outside of the reservoir tank 23.

According to the present embodiment, the hydrogen gas inside the reservoir tank 23 can be extracted to the outside of the reservoir tank 23 from these gaps 42 and 43. Therefore, according to this embodiment, the same effect as that of the first embodiment is obtained. In the present embodiment, these gaps 42, 43 correspond to the extraction part for extracting hydrogen gas.

(Sixth Embodiment)
The present embodiment is different from the first embodiment in that the hose 25 is formed with a withdrawal portion. The other configuration of the circuit 20 is the same as that of the first embodiment.

As shown in FIG. 8, the hose 25 has a first flow passage portion 251 and a second flow passage portion 252. The first flow path portion 251 is a part of the hose 25. The second flow path portion 252 is another part of the hose 25. The first flow channel portion 251 and the second flow channel portion 252 are connected via a joint 253. Each of the 1st flow path part 251 and the 2nd flow path part 252 is comprised only with a rubber layer. The material forming the rubber layer of the second flow path portion 252 has a higher gas permeability coefficient of hydrogen gas than the material forming the rubber layer of the first flow path portion 251. As a result, the second flow passage portion 252 has a higher hydrogen gas permeability than the first flow passage portion 251.

EPDM, which is a synthetic rubber, is used as a material forming the rubber layer of the first flow path section 251. Silicon rubber, which is a synthetic rubber, is used as a material forming the rubber layer of the second flow path portion 252.

According to the present embodiment, hydrogen gas can be extracted from the second flow path 252 to the outside of the circuit 20. Therefore, according to this embodiment, the same effect as that of the first embodiment is obtained. In the present embodiment, the second flow path section 252 corresponds to the extraction section that extracts the gas.

Note that each of the first flow path portion 251 and the second flow path portion 252 may be formed of a laminated body including a rubber layer and a layer other than the rubber layer. Also in this case, the material forming the rubber layer of the second flow passage portion 252 has a higher gas permeability coefficient of hydrogen gas than the material forming the rubber layer of the first flow passage portion 251. As a result, the hydrogen gas permeability of the entire stacked body forming the second flow path portion 252 may be higher than the hydrogen gas permeability of the entire stacked body forming the first flow path portion 251.

In addition, in the present embodiment, the first flow path section 251 and the second flow path section 252 were connected via the joint 253. However, the first flow channel section 251 and the second flow channel section 252 may be directly connected.

(Seventh embodiment)
The present embodiment is different from the first embodiment in that the hose 25 is formed with a withdrawal portion. The other configuration of the circuit 20 is the same as that of the first embodiment.

As shown in FIG. 9, the hose 25 has a first flow path portion 254 and a second flow path portion 255. The first flow path portion 254 is a part of the hose 25. The second flow path 255 is another part of the hose 25. Each of the 1st flow path part 254 and the 2nd flow path part 255 is comprised only with a rubber layer. The rubber layer of the first flow path portion 254 and the rubber layer of the second flow path portion 255 are made of the same material and are continuous. The rubber layer of the second flow path portion 255 is thinner than the rubber layer of the first flow path portion 254. As a result, the second flow passage portion 255 has higher hydrogen gas permeability than the first flow passage portion 254. EPDM, which is a synthetic rubber, is used as a material forming these rubber layers.

According to the present embodiment, hydrogen gas can be extracted from the second flow path 255 to the outside of the circuit 20. Therefore, according to this embodiment, the same effect as that of the first embodiment is obtained. In the present embodiment, the second flow path portion 255 corresponds to the extraction portion that extracts the gas.

If the rubber layer of the second flow passage portion 255 is thinner than the rubber layer of the first flow passage portion 254, the hydrogen gas permeability of the second flow passage portion 255 is higher than that of the first flow passage portion 254. The rubber layer of the first flow path portion 254 and the rubber layer of the second flow path portion 255 may be made of different materials.

Each of the first flow path portion 254 and the second flow path portion 255 may be composed of a laminated body of a rubber layer and a layer other than the rubber layer. Also in this case, the rubber layer of the second flow passage portion 255 is thinner than the rubber layer of the first flow passage portion 254. As a result, the hydrogen gas permeability of the entire stacked body forming the second flow path portion 255 may be higher than the hydrogen gas permeability of the entire stacked body forming the first flow path portion 254.

(Other embodiments)
(1) In each of the above-described embodiments, water to which the freezing point depressant is added is used as the base material of the heat transport medium 14. However, an organic solvent may be used as the base material of the heat transport medium 14. When the heat transport medium 14 contains an organic solvent, the organic solvent is vaporized to generate gas from the heat transport medium 14. In this case, the hydrogen gas described in each of the above embodiments may be read as a gas in which an organic solvent is vaporized. Further, in this case, the portion of the heat exchanger 22 that comes into contact with the heat transport medium 14 does not have to be made of a material containing aluminum.

(2) In each of the above-described embodiments, the extraction part for extracting the gas is formed in the reservoir tank 23 or the hose 25. However, the removal part may be formed in the heat exchanger 22, the pump 24, or the like. The removal part may be formed in a part of the circuit 20.

(3) In each of the above-described embodiments, the heating element 12 and the circuit 20 are mounted on the vehicle, but they may not be mounted on the vehicle. That is, the heating element 12 does not have to be mounted on the vehicle as long as it generates heat along with discharge and power conversion. Examples of such a heating element 12 include an electric device such as an inverter included in a stationary charging station that charges a battery of an electric vehicle.

(4) In each of the above-described embodiments, the heat transport medium 14 does not include an ionic rust inhibitor. However, if the heat transport medium 14 has electrical insulation, the heat transport medium 14 may contain an ionic rust preventive agent. Examples of the ionic rust preventive agent include nitrite, molybdate, chromate, phosphonate, phosphate, sebacic acid, and triazole compound. The phrase "the heat transport medium 14 has electrical insulation" as used herein means that the conductivity of the heat transport medium 14 is 500 μS/cm or less. This conductivity is a measured value at room temperature, for example, 25°C. According to the results of experiments conducted by the present inventor, the conductivity of the heat transport medium 14 is 500 μS/cm or less, thereby suppressing the occurrence of liquid leakage when the leaked heat transport medium 14 touches the heating element 12. You can In order to suppress the liquid junction, the conductivity of the heat transport medium 14 is preferably 100 μS/cm or less, and more preferably 10 μS/cm or less.

Also in this case, the heat transport medium 14 has the function of rust prevention by including the orthosilicate ester in the heat transport medium 14. Therefore, the amount of the ionic rust preventive agent contained in the heat transport medium 14 can be reduced as compared with the heat transport medium 14 containing the ionic rust preventive agent for rust prevention (for example, engine cooling water). .. That is, the conductivity of the heat transport medium 14 can be made lower than that of the heat transport medium 14 containing an ionic anticorrosive agent for rust prevention. As a result, the heat transport medium 14 can have electrical insulation.

(5) The present disclosure is not limited to the above-described embodiments, can be modified as appropriate, and includes various modifications and modifications within the equivalent range. Further, the above embodiments are not unrelated to each other, and can be appropriately combined unless a combination is obviously impossible. Further, in each of the above-mentioned embodiments, it is needless to say that the elements constituting the embodiment are not necessarily indispensable except when explicitly specified as being indispensable and when it is considered to be indispensable in principle. Yes. Further, in each of the above-mentioned embodiments, when numerical values such as the number of components of the embodiment, numerical values, amounts, ranges, etc. are mentioned, it is clearly limited to a particular number and in principle limited to a specific number. It is not limited to the specific number, except in the case of being performed. Further, in each of the above-mentioned embodiments, when referring to materials, shapes, positional relationships, etc. of constituent elements, etc., unless specifically stated or in principle limited to specific materials, shapes, positional relationships, etc. However, the material, shape, positional relationship, etc. are not limited.

(Summary)
According to the first aspect shown in part or all of each of the above-described embodiments, the heat management system that manages the heat of the heating element that generates heat due to discharge charging or power conversion converts the heat received from the heating element. A liquid heat transport medium to be transported and a circuit through which the heat transport medium flows are provided. The circuit has a heat exchanger that releases heat of the heat transport medium to the outside of the circuit by heat exchange between the heat transport medium and the heat exchange medium, and a reservoir tank that stores the heat transport medium. A part of the circuit is formed with an extraction part for extracting the gas generated from the heat transport medium to the outside of the circuit.

Also, according to the second aspect, the removal portion is formed in the reservoir tank. As described above, it is preferable that the removal portion is formed in the reservoir tank.

Further, according to a third aspect, the reservoir tank forms a tank space together with the first wall portion that forms a tank space that stores the heat transport medium, and the tank space is larger than the first wall portion. And a second wall portion having a small surface area facing the. The second wall has a higher gas permeability than the first wall. The removal portion is the second wall portion. In this way, it is preferable that the removal portion is formed.

According to a fourth aspect, the reservoir tank is formed with a gas passage through which gas flows from the tank space that stores the heat transport medium to the outside of the reservoir tank. The extraction part is a gas passage. In this way, it is preferable that the removal portion is formed.

Further, according to a fifth aspect, the circuit has a flow passage forming portion that connects the constituent components of the circuit to each other and forms a flow passage through which the heat transport medium flows. The removal part is formed in the flow path forming part. In this way, it is preferable that the removal portion is formed in the flow path forming portion.

Further, according to the sixth aspect, the flow channel forming unit has a first flow channel unit and a second flow channel unit having a gas permeability higher than that of the first flow channel unit. The removal part is the second flow path part. In this way, it is preferable that the removal portion is formed.

Also, according to the seventh aspect, the heat transport medium contains water. The part of the heat exchanger that comes into contact with the heat transport medium is made of a member containing aluminum. The gas is hydrogen gas. The thermal management systems of the first to sixth aspects are particularly effective in the case of the configuration of the seventh aspect.

According to the eighth aspect, the heat transport medium contains a liquid base material and an orthosilicate ester, and does not contain an ionic rust preventive agent. According to this, the heat transport medium comprises orthosilicate ester. Therefore, the heat transport medium can have a rust preventive function. Therefore, the heat transport medium may not include the ionic rust preventive agent. Furthermore, the heat transport medium contains an orthosilicate ester and does not contain an ionic anticorrosive agent. Therefore, the conductivity of the heat transport medium can be lowered as compared with the case where the heat transport medium contains an ionic anticorrosive agent. Therefore, by using the heat transport medium having a low conductivity, it is possible to avoid the occurrence of liquid drop when the leaked heat transport medium contacts the heating element.

Further, according to the ninth aspect, the heat transport medium includes a liquid base material and an orthosilicate ester compatible with the base material, and has electrical insulation properties. According to this, the heat transport medium comprises orthosilicate ester. Therefore, the heat transport medium can have a rust preventive function. Therefore, the amount of the ionic rust preventive agent contained in the heat transport medium can be reduced as compared with the heat transport medium containing the ionic rust preventive agent for rust prevention. That is, the conductivity of the heat transport medium can be lowered as compared with the heat transport medium containing an ionic rust preventive agent for rust prevention. As a result, the heat transport medium can have electrical insulation. Therefore, by using the heat transport medium having the electrical insulation property, it is possible to suppress the occurrence of liquid leakage when the leaked heat transport medium contacts the heating element.

Further, according to the tenth aspect, the conductivity of the heat transport medium is 500 μS/cm or less. As described above, the heat transport medium has an electric insulating property with an electric conductivity of 500 μS/cm or less. As a result, it is possible to suppress the generation of liquid when the leaked heat transport medium comes into contact with the heating element.

Further, according to the eleventh aspect, the heat exchange medium is air, oil, or a refrigeration cycle refrigerant. Thus, as the heat exchange medium, air, oil, or a refrigeration cycle refrigerant can be used.

According to the twelfth aspect, the heat management system is mounted on the vehicle. The heating element is a battery for driving the vehicle, a fuel cell mounted on the vehicle, an inverter mounted on the vehicle, or a motor generator mounted on the vehicle. As described above, the thermal management systems of the first to ninth aspects are particularly effective in the case of the configuration of the tenth aspect.

Claims (12)

A heat management system for managing heat of a heating element (12) that generates heat due to discharge or conversion of electric power,
A liquid heat transport medium (14) for transporting heat received from the heating element,
A circuit (20) through which the heat transport medium flows,
The circuit is
A heat exchanger (22) for releasing heat of the heat transport medium to the outside of the circuit by heat exchange between the heat transport medium and the heat exchange medium;
A reservoir tank (23) for storing the heat transport medium,
A heat management part is provided with a removal part (32, 34, 35, 41, 42, 43, 252, 255) for removing the gas generated from the heat transport medium to the outside of the circuit. system. The thermal management system according to claim 1, wherein the removal part (32, 34, 35, 41, 42, 43) is formed in the reservoir tank. The reservoir tank forms a tank space together with a first wall portion (31, 33) that forms a tank space (233) that stores the heat transport medium, and the first wall portion Also has a second wall portion (32, 34) having a small surface area facing the tank space,
The second wall has a higher gas permeability than the first wall,
The thermal management system according to claim 2, wherein the removal portion is the second wall portion. In the reservoir tank, gas passages (41, 42, 43) for flowing the gas from the tank space storing the heat transport medium toward the outside of the reservoir tank are formed,
The thermal management system according to claim 2, wherein the removal unit is the gas passage. The circuit has a flow path forming part (25) that connects the constituent parts of the circuit to each other and forms a flow path through which the heat transport medium flows,
The thermal management system according to claim 1, wherein the removal unit (252, 255) is formed in the flow path formation unit. The flow channel forming unit includes a first flow channel unit (251, 254) and a second flow channel unit (252, 255) having higher gas permeability than the first flow channel unit,
The thermal management system according to claim 5, wherein the removal unit is the second flow path unit. The heat transport medium comprises water,
The portion of the heat exchanger that comes into contact with the heat transport medium is made of a member containing aluminum,
The thermal management system according to claim 1, wherein the gas is hydrogen gas. The heat management system according to any one of claims 1 to 6, wherein the heat transport medium includes a liquid base material and an orthosilicate ester, and does not include an ionic rust preventive agent. The heat management system according to any one of claims 1 to 6, wherein the heat transport medium includes a liquid base material and an orthosilicate ester, and has electrical insulation properties. The heat management system according to claim 8 or 9, wherein the conductivity of the heat transport medium is 500 µS/cm or less. The heat management system according to any one of claims 1 to 10, wherein the heat exchange medium is air, oil, or a refrigerant of a refrigeration cycle. The heat management system is mounted on a vehicle,
The heat generator according to any one of claims 1 to 11, wherein the heating element is a vehicle running battery, a vehicle-mounted fuel cell, a vehicle-mounted inverter, or a vehicle-mounted motor generator. Management system.

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