JP6065637B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling system using an air conditioning refrigeration cycle for battery cooling.

  An electric vehicle such as an electric vehicle or a hybrid vehicle travels when electric energy stored in a power storage device such as a secondary battery represented by lithium ion or the like is supplied to and driven by a motor via an inverter or the like. In the secondary battery used in such an electric vehicle, Joule heat is generated by taking in and out electric power during traveling and charging, and the battery temperature rises. And if a secondary battery exceeds predetermined temperature, since deterioration and damage of a battery will be caused, the cooling means for maintaining a secondary battery below to predetermined temperature will be needed. For this reason, conventionally, a method of cooling the secondary battery by blowing air from a blower fan or the like has been common.

  However, with the widespread use of electric vehicles, the output of secondary batteries tends to increase, such as the motors becoming more powerful and requiring rapid charging. For this reason, a large-capacity cooling means that does not affect air conditioning is required. Furthermore, since the deterioration of the secondary battery is suppressed as the temperature becomes lower, it has been studied to make the battery temperature lower than the outside air temperature.

  In order to cope with these problems, for example, Patent Document 1 proposes a battery cooling method using a refrigeration cycle for air conditioning. Specifically, in the refrigeration cycle of Patent Document 1, an air conditioning evaporator that cools the air blown into the vehicle interior and the battery evaporator that cools the battery air blown toward the battery. These two evaporators are connected in parallel to the flow of refrigerant discharged from a common compressor.

JP 2009-11890 A

  However, in the above conventional technology, the air conditioner not only operates for air conditioning in the vehicle interior, but also performs a refrigeration cycle for battery cooling during charging and traveling even when it is not necessary to perform air conditioning in the vehicle interior. You may have to make it work. For this reason, since the operation time becomes longer than the operation time when performing only the air conditioning in the vehicle interior, there is a problem that the durable life of the devices constituting the refrigeration cycle is adversely affected.

  In view of the above points, an object of the present invention is to shorten the operation time of components constituting a cooling system in a cooling system using an air-conditioning refrigeration cycle for battery cooling.

In order to achieve the above object, the invention described in claim 1
A battery evaporator (24) that cools the blown air for the battery blown toward the battery (26) by evaporating the low-pressure refrigerant, and an air-conditioner that is blown toward the air-conditioning target space by evaporating the low-pressure refrigerant. A vapor compression refrigeration cycle (10) having an air conditioning evaporator (17) for cooling the blast air, a battery opening / closing means (23) for inhibiting the refrigerant from flowing into the battery evaporator (24),
Battery blowing means (33) for blowing battery air;
The battery evaporator (24), the battery (26), and the battery air blowing means (33) are accommodated, and the battery air is supplied to the air outlet side of the battery evaporator (24) → battery (26) → battery. A battery casing (32) having a circulation ventilation path (34) for circulation in order of the blowing air inlet side of the evaporator (24), and an outside air introduction means (38) for introducing outside air into the circulation ventilation path (34); With
The refrigerant evaporation temperature in the battery evaporator (24) is lower than the refrigerant evaporation temperature in the air conditioning evaporator (17),
When the outside air introduction means (38) is introducing outside air into the circulation ventilation path (34), the battery opening / closing means (23) prohibits the refrigerant from flowing into the battery evaporator (24),
Cooling characterized in that when the outside air introduction means (38) does not introduce outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is 0 ° C. or lower. System.

  According to this, since the refrigerant evaporation temperature in the battery evaporator (24) is lower than the refrigerant evaporation temperature in the air conditioning evaporator (17), the cooling time of the battery (26) can be shortened. it can. At this time, since the circulation ventilation path (34) is a circulation path, the refrigerant evaporation temperature in the battery evaporator (24) is set to a temperature at which frost formation occurs in the battery evaporator (24) (for example, 0 ° C. ) Even if it is reduced to the following, it is possible to suppress frost formation on the battery evaporator (24), and the cooling time of the battery (26) can be effectively shortened. As a result, the operation time of the apparatus which comprises a cooling system can be shortened effectively.
  When the outside air introduction means (38) is introducing outside air into the circulation ventilation path (34), the battery opening / closing means (23) prohibits the refrigerant from flowing into the battery evaporator (24). To do. Thereby, it can prevent that external air is introduce | transduced in the ventilation path (34) for a circulation, and frost formation generate | occur | produces in the evaporator (24) for batteries. When the outside air introduction means (38) does not introduce outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is 0 ° C. or lower. At this time, since outside air is not introduced into the circulation ventilation path (34), frost formation does not occur in the battery evaporator (24) due to moisture contained in the outside air. Therefore, in the cooling system using the air-conditioning refrigeration cycle for battery cooling, it is possible to shorten the operation time of the parts constituting the cooling system.

  The invention according to claim 2
  A battery evaporator (24) that cools the blown air for the battery blown toward the battery (26) by evaporating the low-pressure refrigerant, and an air-conditioner that is blown toward the air-conditioning target space by evaporating the low-pressure refrigerant. A vapor compression refrigeration cycle (10) having an air conditioning evaporator (17) for cooling the blast air for use;
  Battery blowing means (33) for blowing the battery blowing air;
  The battery evaporator (24), the battery (26), and the battery air blowing means (33) are accommodated, and the battery air is supplied from the air outlet side of the battery evaporator (24) to the battery. (26) → A circulation ventilation path (34) that circulates in order of the blowing air inlet side of the battery evaporator (24), and an outside air introduction means (38) that introduces outside air into the circulation ventilation path (34). A battery casing (32) having,
  The refrigerant evaporation temperature in the battery evaporator (24) is lower than the refrigerant evaporation temperature in the air conditioning evaporator (17), and
  When the outside air introduction means (38) is introducing outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is higher than 0 ° C.,
  When the outside air introduction means (38) does not introduce outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is a temperature of 0 ° C. or less. This is a cooling system.

According to this, since the refrigerant evaporation temperature in the battery evaporator (24) is lower than the refrigerant evaporation temperature in the air conditioning evaporator (17), the cooling time of the battery (26) can be shortened. it can. At this time, since the circulation ventilation path (34) is a circulation path, the refrigerant evaporation temperature in the battery evaporator (24) is set to a temperature at which frost formation occurs in the battery evaporator (24) (for example, 0 ° C. ) Even if it is reduced to the following, it is possible to suppress frost formation on the battery evaporator (24), and the cooling time of the battery (26) can be effectively shortened. As a result, the operation time of the apparatus which comprises a cooling system can be shortened effectively.
When the outside air introduction means (38) is introducing outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is higher than 0 ° C. The battery (26) can be cooled while suppressing the formation of frost on the battery evaporator (24) by moisture contained in the outside air. When the outside air introduction means (38) does not introduce outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is 0 ° C. or lower. Therefore, the operation time of the devices constituting the cooling system can be further effectively shortened.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a whole block diagram of the cooling system which concerns on 1st Embodiment of this invention, and is a whole block diagram which shows the refrigerant | coolant flow in battery cooling single operation mode. It is a flowchart showing the control content in the cooling system of FIG. It is a whole block diagram which shows the refrigerant | coolant flow in the battery cooling + air_conditioning | cooling simultaneous operation mode of the cooling system of 1st Embodiment. It is a whole block diagram which shows the refrigerant | coolant flow in the air_conditioning | cooling independent operation mode of the cooling system of 1st Embodiment. It is a whole block diagram of the cooling system which concerns on 2nd Embodiment of this invention. In 2nd Embodiment, it is the flowchart showing the control content in a cooling system. It is a whole block diagram of the battery pack which concerns on 3rd Embodiment of this invention. In 3rd Embodiment, it is the flowchart showing the control content in a cooling system. In 4th Embodiment, it is the flowchart showing the control content in a cooling system. In 5th Embodiment, it is the figure showing the battery target value TEOb with respect to battery temperature Tb. In 6th Embodiment, it is the figure showing target value TEOb for batteries with respect to battery temperature Tb. In 7th Embodiment, it is the figure showing the battery target value TEOb with respect to the battery temperature Tb according to the variation in the temperature between cells.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the cooling system according to the present invention is applied to an electric vehicle that obtains a driving force for traveling of a vehicle from an electric motor for traveling. Furthermore, in the electric vehicle according to the present embodiment, the cooling system is operated by adjusting the temperature of the secondary battery 26 as an electric storage means for storing electric power supplied to the air conditioning (cooling and heating) in the vehicle interior and the electric motor for traveling ( Used for cooling).

  More specifically, the cooling system includes a vapor compression refrigeration cycle 10, an indoor air conditioning unit 19, and a battery pack 27. The cooling system functions to adjust the temperature of indoor blowing air blown into the vehicle interior. It is comprised so that the function which adjusts the temperature of the ventilation air for batteries sent toward the secondary battery 26 may be fulfilled.

  Among the components of the refrigeration cycle 10, the compressor 11 is disposed in the vehicle bonnet, sucks refrigerant in the refrigeration cycle 10, compresses and discharges it, and has a fixed capacity type compression mechanism with a fixed discharge capacity. Is configured as an electric compressor that is rotationally driven by an electric motor. The operation (the number of rotations) of the electric motor of the compressor 11 is controlled by a control signal output from a control device described later. The discharge port side of the compressor 11 is connected to the refrigerant inlet side of the condenser 12.

  The refrigeration cycle 10 employs an HFC refrigerant (specifically, R134a) as a refrigerant, and constitutes a vapor compression subcritical refrigeration cycle in which the high-pressure side refrigerant pressure does not exceed the refrigerant critical pressure. Yes. Of course, an HFO refrigerant (specifically, R1234yf) or the like may be adopted as the refrigerant. Further, the refrigerant is mixed with refrigerating machine oil for lubricating the compressor 11, and a part of the refrigerating machine oil circulates in the cycle together with the refrigerant.

  The condenser 12 is a heat-dissipating heat exchanger that is arranged in the vehicle bonnet and heat-exchanges the high-pressure gas-phase refrigerant that circulates in the vehicle hood and the outside air blown from the blower fan 13 to condense the refrigerant.

  The blower fan 13 is an electric blower in which the operating rate, that is, the rotation speed (the amount of blown air) is controlled by a control voltage output from the control device. The inlet side of the liquid receiver 14 is connected to the refrigerant outlet side of the condenser 12. Therefore, the refrigerant that has flowed out of the condenser 12 flows into the liquid receiver 14.

  The liquid receiver 14 is a container that separates the gas-liquid of the refrigerant that has flowed into the liquid receiver 14 and stores excess refrigerant in the cycle. Connected to the outlet side of the liquid receiver 14 is a refrigerant inlet of the branching portion 15 that branches the flow of the refrigerant flowing out of the condenser 12.

  The branch portion 15 is configured by a three-way joint, and one of the three inflow / outflow ports is a refrigerant inflow port, and the remaining two are the refrigerant outflow ports. Such a three-way joint may be formed by joining pipes having different pipe diameters, or may be formed by providing a plurality of refrigerant passages in a metal block or a resin block.

  An air conditioning on-off valve 16 is connected to one refrigerant outlet of the branch portion 15. The air conditioning on / off valve 16 is an opening / closing means that permits or prohibits refrigerant from flowing into the air conditioning evaporator 17, and is an electromagnetic valve whose opening / closing operation is controlled by a control voltage output from the control device. An air conditioning expansion valve 18 is connected downstream of the air conditioning on-off valve 16.

  The air conditioning expansion valve 18 has a temperature sensing portion arranged in the refrigerant passage on the outlet side of the air conditioning evaporator 17. The air-conditioning expansion valve 18 detects the degree of superheat of the air-conditioning evaporator 17 outlet-side refrigerant based on the temperature and pressure of the air-conditioning evaporator 17 outlet-side refrigerant, and the air-conditioning evaporator 17 outlet-side refrigerant The pressure reducing means adjusts the valve opening (refrigerant flow rate) by a mechanical mechanism so that the degree of superheat falls within a predetermined range. An air conditioning evaporator 17 is connected to the air conditioning expansion valve 18.

  The air conditioning evaporator 17 is disposed on the upstream side of the air flow with respect to the heater core 21 in the air conditioning casing 20 of the indoor air conditioning unit 19. The air conditioner evaporator 17 cools the air-conditioning blown air blown toward the air-conditioning target space by heat-exchanging the low-pressure refrigerant decompressed and expanded by the air-conditioning expansion valve 18 and the room blown air to evaporate. It is a heat exchanger for cooling. A downstream pressure reducing valve 22 is connected to the downstream side of the air conditioning expansion valve 18.

  The downstream pressure reducing valve 22 is a downstream pressure reducing means for reducing the pressure of the refrigerant flowing out of the air conditioning evaporator 17. The downstream pressure reducing valve 22 is an electrically variable type that includes a valve body that can change the throttle opening degree and an electric actuator that includes a stepping motor that changes the throttle opening degree of the valve body. It is a diaphragm mechanism, and its operation is controlled by a control signal output from the control device. Further, the downstream pressure reducing valve 22 is configured by a variable throttle mechanism with a full opening function that functions as a simple refrigerant passage without exerting almost any refrigerant pressure reducing action by fully opening the throttle opening. The downstream pressure reducing valve 22 may be a constant pressure valve that maintains the refrigerant pressure upstream of the downstream pressure reducing valve 22 at a predetermined pressure or higher by a mechanical mechanism.

  A battery open / close valve 23 is connected to the other refrigerant outlet of the branch portion 15. The battery open / close valve 23 is a battery open / close means that permits or prohibits refrigerant from flowing into the battery evaporator 24. The battery on-off valve 23 is an electromagnetic valve similar to the air-conditioning on-off valve 16, and its opening / closing operation is controlled by a control voltage output from the control device.

  A battery expansion valve 25 is connected to the downstream side of the battery open / close valve 23. The battery expansion valve 25 is a decompression unit having the same configuration as the air conditioning expansion valve 18 described above. A battery evaporator 24 is connected to the battery open / close valve 23.

  The battery evaporator 24 is disposed in a battery pack 27 that forms an air passage for battery blown air that is blown toward the secondary battery 26. Further, the battery evaporator 24 cools the battery air blown toward the secondary battery 26 by exchanging heat between the low-pressure refrigerant flowing through the battery evaporator and the battery air.

  A merging portion 28 is connected to the downstream side of the downstream pressure reducing valve 22 and the downstream side of the battery expansion valve 25. The merging portion 28 is configured by a three-way joint similar to the branch portion 15, and two of the three inflow / outflow ports are refrigerant inlets and the remaining one is a refrigerant outlet. That is, the merging unit 28 merges the refrigerant flow that has flowed out of the downstream pressure reducing valve 22 and the refrigerant flow that has flowed out of the battery evaporator 24. The refrigerant outlet of the junction 28 is connected to the inlet side of the compressor 11.

  As described above, the refrigeration cycle 10 is configured such that the refrigerant flows in parallel by the branch portion 15 and the merge portion 28. Therefore, the air-conditioning evaporator 17 evaporates one refrigerant branched at the branching portion 15, and the battery evaporator 24 evaporates the other refrigerant branched at the branching portion 15. The above is the overall configuration of the refrigeration cycle 10.

  Next, the indoor air conditioning unit 19 will be described. The indoor air conditioning unit 19 blows the temperature-adjusted indoor air to the vehicle interior. This indoor air-conditioning unit 19 is disposed inside the instrument panel (instrument panel) at the foremost part of the vehicle interior, and a blower 29, a heater core 21, and an air-conditioning evaporator 17 are provided in an air-conditioning casing 20 that forms the outer shell. It is comprised by accommodating etc.

  The air-conditioning casing 20 forms an air passage for indoor blown air inside, and is molded of a resin such as polypropylene having a certain degree of elasticity and excellent strength. In addition, on the most upstream side of the air flow of the indoor blast air in the air conditioning casing 20, an inside / outside air switching device (not shown) for switching and introducing the vehicle interior air, that is, the inside air and the outside air, is arranged. The blower 29 is located on the downstream side of the blown air flow of the inside / outside air switching device.

  The blower 29 is an electric blower that drives a centrifugal multiblade fan (sirocco fan) with an electric motor, and the number of rotations (air flow rate) is controlled by a control voltage output from the control device. On the downstream side of the air flow of the blower 29, the air conditioning evaporator 17 and the heater core 21 are arranged in this order with respect to the flow of the indoor blown air. In other words, the air conditioning evaporator 17 is disposed upstream of the heater core 21 in the flow direction of the indoor blast air.

  The heater core 21 is a heating unit that reheats the cold air that has passed through the air conditioning evaporator 17. The heater core 21 is disposed on the downstream side of the air flow of the air conditioning evaporator 17. As the heater core 21 of this type, a heat exchanger for heating that heats the cold air by exchanging heat between the cooling water of the electric motor for traveling and the cold air can be employed. Furthermore, the heater core 21 may be one that heats the cold air by exchanging heat between the heat medium heated by the electric heater and the cold air.

  Further, on the downstream side of the air flow of the air conditioning evaporator 17 and the upstream side of the air flow of the heater core 21, the ratio of the amount of air passing through the heater core 21 in the blown air after passing through the air conditioning evaporator 17 is adjusted. An air mix door 30 is disposed. A mixing space 31 is provided on the downstream side of the air flow of the heater core 21 to mix the blown air heated by the heater core 21 and the blown air that is not heated by bypassing the heater core 21.

  An opening hole through which the conditioned air mixed in the mixing space 31 is blown out into the passenger compartment, which is the air-conditioning target space, is arranged in the most downstream portion of the airflow casing 20. Specifically, the opening hole includes a face opening hole that blows air-conditioned air toward the upper body of the passenger in the passenger compartment, a foot opening hole that blows air-conditioned air toward the feet of the passenger, and an inner surface of the front window glass of the vehicle. A defroster opening hole (both not shown) for blowing the conditioned air toward is provided.

  Therefore, the temperature of the conditioned air mixed in the mixing space 31 is adjusted by adjusting the ratio of the air volume that the air mix door 30 passes through the heater core 21, and the temperature of the conditioned air blown out from each opening hole is adjusted. Is done. That is, the air mix door 30 constitutes temperature adjusting means for adjusting the temperature of the conditioned air blown into the vehicle interior. The air mix door 30 is driven by a servo motor (not shown) whose operation is controlled by a control signal output from the control device.

  Furthermore, on the upstream side of the air flow of the face opening hole, foot opening hole, and defroster opening hole, a face door that adjusts the opening area of the face opening hole, a foot door that adjusts the opening area of the foot opening hole, and a defroster opening hole, respectively A defroster door (none of which is shown) for adjusting the opening area is arranged.

  These face doors, foot doors, and defroster doors constitute opening hole mode switching means for switching the opening hole mode, and their operations are controlled by a control signal output from the control device via a link mechanism or the like. It is driven by a servo motor (not shown). The above is the overall configuration of the indoor air conditioning unit 19.

  Next, the battery pack 27 will be described. The battery pack 27 is disposed on the vehicle bottom surface side between the trunk room at the rear of the vehicle and the rear seat, and is used for a battery in a metal battery casing 32 that has been subjected to an electrical insulation process (for example, insulation coating). An air passage for circulating the blown air is formed, and the blower 33, the above-described battery evaporator 24, the secondary battery 26, and the like are accommodated in the air passage. Specifically, the battery casing 32 circulates the battery blowing air in the order of the blowing air outlet side of the battery evaporator 24 → the secondary battery 26 → the blowing air inlet side of the battery evaporator 24. Is forming.

  The blower 33 is a battery blowing means that is arranged on the upstream side of the air flow of the battery evaporator 24 and blows the battery blown air toward the battery evaporator 24, and is controlled by a control voltage output from the control device. It is an electric blower in which the operating rate, that is, the rotation speed (the amount of blown air) is controlled. Further, a secondary battery 26 is disposed on the downstream side of the air flow of the battery evaporator 24, and the downstream side of the secondary battery 26 communicates with the suction port side of the blower 33.

  Therefore, when the blower 33 is operated, the battery blown air whose temperature has been adjusted by the battery evaporator 24 is blown to the secondary battery 26, and the temperature of the secondary battery 26 is adjusted. Further, the battery air that has been subjected to temperature adjustment of the secondary battery 26 is sucked into the blower 33 and blown again toward the battery evaporator 24. The above is the overall configuration of the battery pack 27.

  Next, the electric control unit of this embodiment will be described. The control device is composed of a well-known microcomputer including a CPU, ROM, RAM, etc. and its peripheral circuits, performs various calculations and processing based on a control program stored in the ROM, and is connected to the output side. The operation of the control target devices 11, 13, 16, 22, 23, 29, 30, 33, etc. is controlled.

  In addition, on the input side of the control device, an inside air sensor that detects the vehicle interior temperature Tr, an outside air sensor that detects the outside air temperature Tam, a solar radiation sensor that detects the amount of solar radiation Ts in the vehicle interior, and the temperature of air blown from the air conditioning evaporator 17 (Evaporator temperature) An air-conditioning evaporator temperature sensor 35 for detecting Tefin, a blowing air temperature sensor for detecting a blowing air temperature TAV blown from the mixed space 31 into the vehicle compartment, and a blowing air temperature (evaporation) of the battery evaporator 24 Various control sensor groups such as a battery evaporator temperature sensor 36 for detecting the battery temperature) and a battery temperature sensor 37 as a battery temperature detecting means for detecting the battery temperature Tb which is the temperature of the secondary battery 26 are connected. Yes.

  Here, the air conditioner evaporator temperature sensor 35 of the present embodiment specifically detects the temperature of the heat exchange fins of the air conditioner evaporator 17. The battery evaporator temperature sensor 36 detects the temperature of the heat exchange fins of the battery evaporator 24. Of course, as the air-conditioning evaporator temperature sensor 35, temperature detecting means for detecting the temperature of other parts of the air-conditioning evaporator 17 may be employed, or the temperature of the refrigerant itself flowing through the air-conditioning evaporator 17 may be directly measured. You may employ | adopt the temperature detection means to detect. The same applies to the battery evaporator temperature sensor 36.

  Further, the secondary battery 26 is configured by a plurality of cells. Such a secondary battery 26 has a large heat capacity with respect to each component of the cooling system, and a temperature distribution tends to occur. Therefore, in the present embodiment, a plurality of battery temperature sensors 37 are used to detect temperatures at a plurality of locations inside and on the surface of the secondary battery 26. And the average value of the detected value of the some battery temperature sensor 37 is made into battery temperature Tb.

  In this embodiment, a blown air temperature sensor for detecting the blown air temperature TAV is provided. As the blown air temperature TAV, values calculated based on the evaporator temperature Tefin, the discharge refrigerant temperature Td, and the like are adopted. Also good.

  Further, an operation panel (not shown) disposed near the instrument panel in the front part of the vehicle interior is connected to the input side of the control device, and operation signals from various operation switches provided on the operation panel are input. As various operation switches provided on the operation panel, there are provided an air conditioning operation switch for requesting air conditioning in the vehicle interior, a vehicle interior temperature setting switch for setting the vehicle interior temperature, an air conditioning operation mode selection switch, and the like.

  Here, the control device of the present embodiment is configured such that the control means for controlling various control target devices connected to the output side is integrally configured, but the configuration for controlling the operation of each control target device ( Hardware and software) constitute control means for controlling the operation of each control target device. The above is the overall configuration of the cooling system according to the present embodiment.

  Next, the operation of the cooling system of the present embodiment having the above configuration will be described. The cooling system operates the above-described refrigeration cycle 10 to perform air conditioning in the passenger compartment and temperature adjustment of the secondary battery 26. Therefore, the cooling system has a battery cooling single operation mode (mode 1) in which the secondary battery 26 is cooled without air conditioning in the vehicle interior, and battery cooling + cooling in which the secondary battery 26 and the vehicle interior are simultaneously cooled. The operation is performed in one of three modes: a simultaneous operation mode (mode 2), and a cooling single operation mode (mode 3) in which the vehicle interior is cooled without cooling the secondary battery 26. When neither cooling of the secondary battery 26 nor cooling of the vehicle interior is performed, the battery cooling + cooling OFF mode (mode 4) is set.

  These operation modes are switched by executing a control program stored in the storage circuit in advance by the control device. This control program will be described with reference to the flowchart of FIG. The control program shown in the flowchart of FIG. 2 is executed as a subroutine of a main routine executed by the control device. In the control process of the main routine executed by the control device, the operation signal of the operation panel and the detection signal of the control sensor group are read, and the control state of various control target devices is determined based on the read detection signal and the value of the operation signal. Then, a control routine for outputting a control signal or a control voltage to various devices to be controlled is repeated so that the determined control state is obtained.

  First, in step S100, it is determined whether there is an air conditioning request. Specifically, when the operation signal of the operation panel is read, if the air conditioning operation switch is OFF, that is, there is no air conditioning request, the process proceeds to step S101. On the other hand, if the air conditioning operation switch is ON, that is, if there is an air conditioning request, the process proceeds to step S102.

  In step S101, it is determined whether there is a battery cooling request. Specifically, the battery temperature of the secondary battery 26 exceeds a predetermined first reference battery temperature (12 ° C. in the present embodiment), or the secondary battery 26 has a predetermined battery temperature. It is determined whether the temperature is below the battery temperature (10 ° C. in the present embodiment). The temperature difference between the first reference battery temperature and the second reference battery temperature is set as a hysteresis for preventing control hunting.

  When the battery temperature of the secondary battery 26 is lower than 10 ° C., it is not necessary to cool the secondary battery 26, so the flowchart ends and returns to step S100 again. This flow corresponds to mode 4 described above. In this case, the control device controls the battery on-off valve 23 and the air-conditioning on-off valve 16 to be closed and the downstream pressure reducing valve 22 to be fully opened.

  On the other hand, when the battery temperature of the secondary battery 26 exceeds 12 ° C., the process proceeds to step S103. In step S103, the cooling system is controlled to operate in mode 1. That is, the control device controls the compressor 11 to operate, the battery open / close valve 23 to the open state, the air conditioning open / close valve 16 to the closed state, and the downstream pressure reducing valve 22 to the fully closed state. As a result, as shown in FIG. 1, the refrigerant discharged from the compressor 11 passes through the condenser 12, the liquid receiver 14, the battery open / close valve 23, the battery expansion valve 25, and the battery evaporator 24 again. Follow the path back to the compressor 11. Therefore, the refrigerant cooled by the condenser 12 is supplied only to the battery cooling circuit, and only the battery cooling is performed.

  Further, regarding the refrigerant discharge capacity of the compressor 11, that is, the control signal output to the electric motor of the compressor 11, the battery detected by the battery target value (battery target temperature) TEOb and the battery evaporator temperature sensor 36. Based on the deviation from the temperature of the air blown from the evaporator 24, the temperature of the air blown from the battery evaporator 24 is determined so as to approach the battery target value TEOb using a feedback control method. This battery target value TEOb is a value stored in advance in the storage circuit of the control device, and is set to a temperature of 0 ° C. or lower.

  By such control, the refrigerant evaporation temperature in the battery evaporator 24 becomes lower than the refrigerant evaporation temperature in the air conditioning evaporator 17. Specifically, the refrigerant evaporation temperature in the battery evaporator 24 is a temperature of 0 ° C. or lower. In the present embodiment, the rotational speed (refrigerant discharge capacity) of the compressor 11 is controlled by the control device so that the temperature of the battery evaporator temperature sensor 36 becomes −10 ° C. As described above, mode 1 control is performed, and the process returns to step S100 again.

  Subsequently, if it is determined in step S100 that there is an air conditioning request, it is determined in step S102 whether there is a battery cooling request that is the same as in step S101. If it is determined in step S102 that the battery temperature of the secondary battery 26 exceeds the predetermined first reference battery temperature (12 ° C. in the present embodiment), the process proceeds to step S104, and the battery temperature of the secondary battery 26 is increased. If it is determined that the temperature is lower than the predetermined second reference battery temperature (10 ° C. in the present embodiment), the process proceeds to step S105.

  In step S104, the cooling system is controlled to operate in mode 2. That is, the control device controls the compressor 11 to operate, the battery open / close valve 23 to the open state, the air conditioning open / close valve 16 to the open state, and the downstream pressure reducing valve 22 to the throttled state to exert a pressure reducing action. Is done.

  As a result, as shown in FIG. 3, the refrigerant discharged from the compressor 11 passes through the condenser 12 and the liquid receiver 14, passes through the branch portion 15, and is supplied to the air conditioning evaporator 17 and the battery evaporator 24. Supplied to both. Therefore, in mode 2, cooling air is produced by both the air conditioning evaporator 17 and the battery evaporator 24.

  Further, the refrigerant discharge capacity of the compressor 11, that is, the control signal output to the electric motor of the compressor 11 is determined in the same manner as in the mode 1. That is, the temperature of the air blown from the battery evaporator 24 is determined so as to approach the battery target value TEOb.

  As for the throttle opening of the downstream pressure reducing valve 22, the deviation between the air conditioning target value (air conditioning target temperature) TEO and the temperature of the air blown from the air conditioning evaporator 17 detected by the air conditioning evaporator temperature sensor 35. Based on the above, the temperature of the air blown from the air conditioning evaporator 17 is determined so as to approach the air conditioning target value TEO using a feedback control method. This air conditioning target value TEO is a value stored in advance in the storage circuit of the control device, and is set to a temperature higher than 0 ° C. so that frost formation does not occur in the air conditioning evaporator 17.

  Further, the control device converts the target blowing temperature TAO, which is the target temperature of the air blown into the vehicle interior, into the vehicle interior temperature Tr, the outside air temperature Tam, and the solar radiation amount Ts based on the detection signal and operation signal values read in the main routine. Calculate based on And the action | operation of the air mix door 30 is controlled so that the blowing air temperature TAV detected by the blowing air temperature sensor approaches the target blowing temperature TAO.

  Here, as described above, vehicle interior or outside air is introduced into the air conditioning casing 20. For this reason, since the moisture in the air supplied to the air conditioning evaporator 17 is condensed in the air conditioning evaporator 17, the refrigerant evaporating temperature in the air conditioning evaporator 17, that is, the blown air temperature, is controlled to a temperature of 0 ° C. or lower. The evaporator 17 is frosted. Therefore, in the present embodiment, the throttle opening degree of the downstream pressure reducing valve 22 is adjusted so that the temperature of the air blown from the air conditioning evaporator 17 is higher than 0 ° C., for example, 1 ° C. As described above, the mode 2 control is performed, and the process returns to step S100 in FIG.

  In step S105, the cooling system is controlled to operate in mode 3. That is, the control device controls the compressor 11 to operate, the battery open / close valve 23 to the closed state, the air conditioning open / close valve 16 to the open state, and the downstream pressure reducing valve 22 to the fully open state. As a result, as shown in FIG. 4, the refrigerant discharged from the compressor 11 is the condenser 12, the liquid receiver 14, the air conditioning on-off valve 16, the air conditioning expansion valve 18, the air conditioning evaporator 17, and the downstream decompression. The path returning to the compressor 11 again through the valve 22 is followed. Therefore, the refrigerant cooled by the condenser 12 is supplied only to the air conditioning cooling circuit.

  Further, in mode 3, the refrigerant discharge capacity of the compressor 11, that is, the control signal output to the electric motor of the compressor 11, is determined by the air conditioning target value (air conditioning target temperature) TEO and the air conditioning evaporator temperature sensor 35. Based on the detected deviation from the air temperature from the air-conditioning evaporator 17, the air temperature from the air-conditioning evaporator 17 is determined to approach the air-conditioning target value TEO using a feedback control method. Thereby, the frost formation to the evaporator 17 for an air conditioning is prevented. As described above, the control of the mode 3 is performed, and the process returns to step S100 in FIG.

  As described above, in this embodiment, in the mode 1 and the mode 2 in which the secondary battery 26 is cooled, the refrigerant evaporation temperature in the battery evaporator 24 is lower than the refrigerant evaporation temperature in the air conditioning evaporator 17. It is controlled to become. Specifically, the refrigerant evaporation temperature in the air conditioning evaporator 17 is adjusted to a temperature higher than 0 ° C., while the refrigerant evaporation temperature in the battery evaporator 24 is adjusted to a temperature of 0 ° C. or lower. .

  In the cooling system of the present embodiment, the circulation ventilation path 34 in the battery casing 32 is a circulation path, so that air having humidity (wet air) flows into the circulation ventilation path 34 from the outside. There is no end to it. Therefore, even if the refrigerant evaporation temperature in the battery evaporator 24 is lowered to 0 ° C. or lower, it is possible to suppress frost formation in the battery evaporator 24. In other words, there is no need to control the battery outlet 24 to have a general blown air temperature (for example, 1 ° C.) set so as to suppress frost formation.

  Accordingly, the battery evaporator 24 can be efficiently cooled by controlling the rotational speed of the compressor 11 so that the temperature of the air blown from the battery evaporator 24 is 0 ° C. or lower. As a result, the operation time of each device constituting the cooling system such as the compressor 11 can be shortened. In connection with this, the fall of the durable performance of the apparatus which comprises a cooling system can be suppressed.

  The cooling capacity can be calculated by cooling capacity = cooling air volume × air specific heat × temperature difference. Assuming that the battery temperature Tb of the secondary battery 26 is 30 ° C., and the temperature of the blown air from the battery evaporator 24 is changed from 0 ° C. to −10 ° C., the cooling of the battery pack 27 with the same air volume is performed. The capacity is [30 ° C .− (− 10 ° C.)] / [30 ° C.−0 ° C.] = 1.33. That is, the cooling capacity can be improved up to 1.33 times. Therefore, according to the cooling system of the present embodiment, the operating time of each device in the battery cooling single operation mode can be shortened by up to 25% compared to the prior art.

Further, air volume of (m ³ / h) Q, the total pressure (Pa) is P, the effective noise is calculated from the effective noise = 10 × Log (Q × P 2/60). Under the above conditions, the effective noise can be reduced by 6 dB. That is, since the cooling capacity of the cooling system is improved by lowering the temperature of the battery cooling air, the air volume of the blower 33 of the battery pack 27 can be suppressed. Therefore, since the effective noise generated by the blowing of the blower 33 is reduced, silence can be ensured.

  When the electric power is turned off, the interior of the electric vehicle is quieter than that of the engine-equipped vehicle, and the interior of the electric vehicle is quieter when the air conditioning is turned off. Since the secondary battery 26 is cooled regardless of the intention of the occupant, if the operating time of the blower 33 is shortened as described above, the comfort of the occupant, that is, the quietness of the occupant is improved.

(Second Embodiment)
In the present embodiment, parts different from the first embodiment will be described. As shown in FIG. 5, the cooling system of the present embodiment has a configuration in which the downstream pressure reducing valve 22 is not provided in the path between the air conditioning expansion valve 18 and the merging portion 28 in the refrigeration cycle 10. .

  In the case of such a configuration, the cooling system operates according to the flowchart shown in FIG. Specifically, if there is an air conditioning request in step S100, it is determined in step S102 whether there is a battery cooling request. As described above, when it is determined in step S102 that the battery temperature of the secondary battery 26 exceeds 12 ° C., the process proceeds to step S106.

  In step S106, the cooling system is controlled to operate in mode 2 '. In mode 2 ′, in the battery cooling + cooling simultaneous operation mode (mode 2) in which the cooling of the secondary battery 26 and the cooling of the vehicle interior are performed at the same time, the temperature of the blown air of the air conditioning evaporator 17 is higher than 0 ° C., for example, 1 In this mode, the number of rotations of the compressor 11 is controlled by the control device so that the temperature becomes 0 ° C.

  Here, in this embodiment, since the downstream pressure reducing valve 22 is not disposed, the refrigerant pressure on the refrigerant downstream side of the air conditioning expansion valve 18 and the refrigerant downstream side of the battery expansion valve 25 are the same, and the air conditioning use The refrigerant temperature downstream of the evaporator 17 and the refrigerant temperature downstream of the battery evaporator 24 are the same. That is, when the rotation speed of the compressor 11 is controlled so that the temperature of the air blown from the battery evaporator 24 becomes −10 ° C. as in the first embodiment, the temperature of the air blown from the air conditioning evaporator 17 is also increased. It becomes -10 degreeC and frost formation will occur.

 Therefore, in the present embodiment, as in the mode 3 of the first embodiment, the compressor 11 so that the temperature of the air blown from the air conditioning evaporator 17 approaches the air conditioning target value TEO (specifically, 1 ° C.). The number of rotations is controlled by the control device.

  On the other hand, if it determines with the battery temperature of the secondary battery 26 being less than 10 degreeC by step S102, it will progress to step S107. In step S107, the cooling system is controlled to operate in mode 3 '. Mode 3 'is an operation mode substantially similar to mode 3 described in the first embodiment. Thereby, even if it is the structure where the downstream pressure reducing valve 22 is not provided, it can prevent that the frost formation of the evaporator 17 for an air conditioning will generate | occur | produce similarly to step S106.

  In the flowchart of FIG. 6, if it is determined in step S100 that there is no air conditioning request and it is determined in step S101 that there is a battery cooling request, step S103 is executed as in the first embodiment. That is, the cooling system is controlled to operate in mode 1. That is, the rotational speed of the compressor 11 is controlled by the control device so that the temperature of the battery evaporator temperature sensor 36 becomes −10 ° C. In this case, since only battery cooling is performed, the refrigerant is prohibited from flowing into the air conditioning evaporator 17, so that no frost formation occurs in the air conditioning evaporator 17.

  As described above, even if the downstream pressure reducing valve 22 on the downstream side of the air conditioning expansion valve 18 is abolished in the refrigeration cycle 10, the operation of each device constituting the cooling system is activated by operating the cooling system in mode 1. Time can be shortened.

(Third embodiment)
In the present embodiment, parts different from the first and second embodiments will be described. In the present embodiment, as shown in FIG. 7, the battery casing 32 includes a mode switching door 38 as outside air introduction means for introducing outside air into the circulation ventilation path 34. The mode switching door 38 includes a motor (not shown) controlled by a control device.

  Then, by controlling the rotation of the motor, the mode switching door 38 shuts off the circulation ventilation path 34 of the battery casing 32 and the outside, and the circulation ventilation path 34 of the battery casing 32 and the outside. Or the outside air introduction mode for conducting the air. The configuration other than the mode switching door 38 is the same as that in FIG.

  In the cooling system of the present embodiment, control is performed in the circulation mode during normal operation. In such control, for example, when the outside air temperature Tam is equal to or lower than a predetermined temperature, the outside air introduction mode is switched. Note that conditions other than the outside air temperature may be set as the conditions for switching to the outside air introduction mode.

  Next, the operation of the cooling system of the present embodiment will be described with reference to the flowchart of FIG. First, when it is determined that there is no air conditioning request in step S100 and there is no battery cooling request in step S101, the process returns to step S100 again. On the other hand, if it is determined in step S101 that there is a battery cooling request, the process proceeds to step S108.

  In step S108, it is determined whether or not the battery pack 27 is in the circulation mode. That is, it is determined whether or not the mode switching door 38 is closed and the circulation ventilation path 34 of the battery casing 32 is disconnected from the outside.

  If it is determined in step S108 that the mode is not the circulation mode but the outside air introduction mode, the process returns to step S100 again. In the outside air introduction mode, since the vehicle interior or outside air is used as battery cooling air, frost formation may occur if the temperature of the air blown from the battery evaporator 24 is controlled to be below the freezing point. Therefore, when the mode switching door 38 introduces outside air into the circulation ventilation path 34, the battery on-off valve 23 is controlled to be closed and the refrigerant is prohibited from flowing into the battery evaporator 24. That is, the refrigerant is prevented from flowing into the battery evaporator 24. Thereby, it is possible to prevent the outside air from being introduced into the battery casing 32 and the battery evaporator 24 from being frosted.

  If it is determined in step S108 that the current mode is the circulation mode, the process proceeds to step S103, and mode 1 control is performed in the same manner as described above. In this case, since outside air is not introduced into the battery casing 32, frost formation does not occur due to moisture contained in the outside air. Therefore, the blown air temperature of the battery evaporator 24 is controlled to be −10 ° C. Thus, the control of mode 1 is performed, and the process returns to step S100 in FIG. 8 again.

  If it is determined in step S100 that there is an air conditioning request and it is determined in step S102 that there is a battery cooling request, the process proceeds to step S109. In step S109, it is determined whether the battery pack 27 is in the circulation mode as in step S108. If it is determined in step S109 that the current mode is the circulation mode, the process proceeds to step S104, and the above-described mode 2 control is performed. Also in this case, since outside air is not introduced into the battery casing 32, frost formation does not occur in the battery evaporator 24. Thus, the control of mode 2 is performed, and the process returns to step S100 in FIG. 8 again.

  On the other hand, if it is determined in step S109 that the mode is not the circulation mode but the outside air introduction mode, the process proceeds to step S105, and the above-described mode 3 control is performed. In this case, since only the vehicle interior is cooled, the battery on-off valve 23 is controlled to be closed. Also in this step S109, the mode switching door 38 is in a state where outside air is introduced into the circulation ventilation path 34, and the battery on-off valve 23 prohibits the refrigerant from flowing into the battery evaporator 24. Thereby, it can prevent that frost formation generate | occur | produces in the evaporator 24 for batteries. Thus, the control of mode 3 is performed, and the process returns to step S100 in FIG.

  As described above, in the circulation mode, the same effect as in the first embodiment can be obtained. Further, even if the secondary battery 26 needs to be cooled individually, in the outside air introduction mode, the operation of the refrigeration cycle 10 is stopped and the secondary battery 26 is cooled by the outside air, so that the refrigeration cycle 10 is configured. It is possible to further effectively shorten the operation time of the equipment to be operated.

(Fourth embodiment)
In the present embodiment, parts different from the third embodiment will be described. The battery casing 32 according to the present embodiment is provided with a mode switching door 38 as in the third embodiment, but the control method in the cooling system is different.

  Specifically, as shown in FIG. 9, when it is determined that there is no air conditioning request in step S100, there is a battery cooling request in step S101, and further in step S108, it is determined that the battery pack 27 is in the circulation mode, step S103 is performed. move on. Thus, the cooling system is controlled to operate in mode 1.

  On the other hand, when it is determined in step S108 that the battery pack 27 is not in the circulation mode, that is, the mode switching door 38 is opened, the process proceeds to step S110. In step S110, the cooling system is controlled to operate in mode 1 '. In mode 1 ′, in the battery cooling single operation mode (mode 1) in which the secondary battery 26 is cooled, the temperature of the battery evaporator temperature sensor 36 for detecting the temperature of the air discharged from the battery evaporator 24 is 1 ° C. In this way, the rotation speed of the compressor 11 is controlled by the control device. Thereby, even if outside air is introduced into the battery casing 32, it is possible to prevent frost formation in the battery evaporator 24. When the process of step S110 is completed, the process returns to step S100 again.

  If it is determined in step S100 that there is an air conditioning request, in step S102 there is a battery cooling request, and in step S109 it is determined that the battery pack 27 is in the circulation mode, the process proceeds to step S104. Thus, the cooling system is controlled to operate in mode 2.

  On the other hand, when it is determined in step S109 that the battery pack 27 is not in the circulation mode, the process proceeds to step S111. In step S111, the cooling system is controlled to operate in mode 2 ''. In mode 2 ″, in the battery cooling + cooling simultaneous operation mode (mode 2) in which the cooling of the secondary battery 26 and the cooling of the vehicle interior are performed simultaneously, the downstream pressure reducing valve 22 is fully opened, and the evaporation for air conditioning is performed. This is a mode in which the rotational speed of the compressor 11 is controlled by the control device so that the blown air temperature of the compressor 17 becomes 1 ° C. and the blown air temperature of the battery evaporator 24 becomes 1 ° C. Thereby, even if the battery cooling and the cooling are operated at the same time, and the outside air is introduced into the battery casing 32, it is possible to prevent frost formation in the battery evaporator 24. When the process of step S111 is completed, the process returns to step S100 again.

  When it is determined in step S102 that there is no battery cooling request, the process proceeds to step S105, and the cooling system is controlled to operate in mode 3.

  As described above, in the circulation mode, the same effect as in the first embodiment can be obtained. Further, even if the secondary battery 26 needs to be cooled individually, in the outside air introduction mode, the operation of the refrigeration cycle 10 is stopped and the secondary battery 26 is cooled by the outside air, so that the refrigeration cycle 10 is configured. It is possible to further effectively shorten the operation time of the equipment to be operated. Moreover, it can suppress that frost formation arises in the battery evaporator 24 at the time of outside air introduction mode.

(Fifth embodiment)
In the present embodiment, parts different from the first to fourth embodiments will be described. The present embodiment is characterized in that the target temperature of the battery cooling air is changed based on the battery temperature Tb of the secondary battery 26.

  For this reason, the control device operates to determine the battery target value TEOb of the refrigerant evaporation temperature in the battery evaporator 24 as the battery target evaporation temperature determining means. Specifically, the control device determines to increase the battery target value TEOb as the battery temperature Tb detected by the battery evaporator temperature sensor 36 increases.

  In the present embodiment, as shown in FIG. 10, the control device changes the battery target value TEOb with a linear function with respect to the battery temperature Tb of the secondary battery 26. FIG. 10 shows a case where the battery target value TEOb is set to be 20 ° C. lower than the battery temperature Tb of the secondary battery 26.

  As a result, when the battery cooling air temperature is controlled below the freezing point, the system efficiency is lowered, and the possibility that the temperature distribution among a plurality of cells in the battery pack 27 is deteriorated by rapidly cooling the secondary battery 26 is reduced. Can be made. In other words, when the temperature of the secondary battery 26 is high, the cooling air temperature is controlled to be high, so that the efficiency of the refrigeration cycle 10 can be improved. Moreover, the temperature variation between the cells in the battery pack 27 can be reduced. That is, a constant cooling capacity can always be given to the secondary battery 26.

(Sixth embodiment)
In the present embodiment, parts different from the fifth embodiment will be described. In the present embodiment, as shown in FIG. 11, the control device changes the battery target value TEOb stepwise with respect to the battery temperature Tb of the secondary battery 26. In this way, the temperature change can be controlled stepwise rather than continuously.

(Seventh embodiment)
In the present embodiment, parts different from the fifth and sixth embodiments will be described. In the fifth and sixth embodiments, the cooling air temperature is controlled using the average value of the plurality of battery temperature sensors 37 as the battery temperature Tb. On the other hand, the present embodiment is characterized in that the control device determines to increase the battery target value TEOb as the variation of the plurality of provided battery temperature sensors 37 increases.

  Specifically, as shown in FIG. 12, the target value TEOb for the battery with respect to the battery temperature Tb is determined according to the temperature variation between cells such as 5 ° C. and 10 ° C. FIG. 12 shows an example in which the battery target value TEOb changes with a linear function with respect to the battery temperature Tb, but the same applies when the battery target value TEOb is changed stepwise with respect to the battery temperature Tb. It is.

  Generally, a cell changes its internal resistance, input / output characteristics, deterioration characteristics, etc. due to temperature changes, so if there is a temperature variation in each cell, the cell deterioration (life) variation, remaining capacity (SOC) estimation accuracy There is concern about deterioration of the cell and input / output characteristics of the cell. However, as described above, since the control is performed according to the temperature variation generated between the plurality of cells in the battery pack 27, the temperature difference between the battery cooling air and the cells can be reduced, and thus the above-described concern. Can be eliminated.

  In particular, if the temperature difference between the cooling air and the cells of the secondary battery 26 is large, the temperature variation generated between the plurality of cells in the battery pack 27 tends to increase, but the inter-cell temperature variation should be controlled to be small. Thus, the original ability of the battery pack 27 can be extracted.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows without departing from the spirit of the present invention.

  (1) In the above-described embodiment, an example in which the cooling system is applied to an electric vehicle has been described. Of course, from a normal vehicle that obtains driving force for vehicle travel from an internal combustion engine, and from both an internal combustion engine and a travel electric motor. You may apply to the hybrid vehicle which obtains the driving force for vehicle travel. When applied to a vehicle having an internal combustion engine, the heater core 21 may be a heating heat exchanger that heats indoor air by using cooling water of the internal combustion engine as a heat source. Further, the cooling system may be applied to other than the vehicle.

  (2) In the above-described embodiment, the example in which the temperature sensor for detecting the temperature of the main body of the secondary battery 26 is employed as the battery temperature detection means for detecting the battery temperature Tb has been described. However, the battery temperature detection means is limited to this. Not. For example, a temperature detection means for detecting the temperature of the battery air immediately after passing through the secondary battery 26 may be adopted, or a temperature detection means for detecting the temperature of the heat medium immediately after passing through the secondary battery 26 may be adopted. Also good.

  (3) In the third and fourth embodiments, the example in which the mode switching door 38 is provided in the battery casing 32 and the outside air is introduced into the battery casing 32 has been described. However, for example, the battery casing 32 may be sealed as in the first embodiment. In this case, dry air having a dew point of 10 ° C. or less can be enclosed in the battery casing 32. Thereby, it is possible to prevent foreign matters such as dust from entering the battery casing 32. Further, frost formation can be prevented from occurring in the battery evaporator 24. Furthermore, it is possible to prevent dew condensation from occurring in devices other than the battery evaporator 24 in the battery casing 32.

10 Refrigerating Cycle 17 Air Conditioning Evaporator 24 Battery Evaporator 26 Secondary Battery (Battery)
32 Battery casing 33 Blower (battery blowing means)
34 Ventilation path for circulation

Claims (6)

A battery evaporator (24) that cools the blown air for the battery blown toward the battery (26) by evaporating the low-pressure refrigerant, and an air-conditioner that is blown toward the air-conditioning target space by evaporating the low-pressure refrigerant. A vapor compression refrigeration cycle (10) having an air-conditioning evaporator (17) for cooling the blast air and a battery opening / closing means (23) for inhibiting the refrigerant from flowing into the battery evaporator (24 ); ,
Battery blowing means (33) for blowing the battery blowing air;
The battery evaporator (24), the battery (26), and the battery air blowing means (33) are accommodated, and the battery air is supplied from the air outlet side of the battery evaporator (24) to the battery. (26) → A circulation ventilation path (34) that circulates in order of the blowing air inlet side of the battery evaporator (24), and an outside air introduction means (38) that introduces outside air into the circulation ventilation path (34). a chromatic for battery casing (32), provided with,
The refrigerant evaporation temperature in the battery evaporator (24) is lower than the refrigerant evaporation temperature in the air conditioning evaporator (17),
When the outside air introduction means (38) is introducing outside air into the circulation ventilation path (34), the battery opening / closing means (23) causes the refrigerant to flow into the battery evaporator (24). Ban
When the outside air introduction means (38) does not introduce outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is a temperature of 0 ° C. or less. And cooling system.   A battery evaporator (24) that cools the blown air for the battery blown toward the battery (26) by evaporating the low-pressure refrigerant, and an air-conditioner that is blown toward the air-conditioning target space by evaporating the low-pressure refrigerant. A vapor compression refrigeration cycle (10) having an air conditioning evaporator (17) for cooling the blast air for use;
  Battery blowing means (33) for blowing the battery blowing air;
  The battery evaporator (24), the battery (26), and the battery air blowing means (33) are accommodated, and the battery air is supplied from the air outlet side of the battery evaporator (24) to the battery. (26) → A circulation ventilation path (34) that circulates in order of the blowing air inlet side of the battery evaporator (24), and an outside air introduction means (38) that introduces outside air into the circulation ventilation path (34). A battery casing (32) having,
  The refrigerant evaporation temperature in the battery evaporator (24) is lower than the refrigerant evaporation temperature in the air conditioning evaporator (17), and
  When the outside air introduction means (38) is introducing outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is higher than 0 ° C.,
  When the outside air introduction means (38) does not introduce outside air into the circulation ventilation path (34), the refrigerant evaporation temperature in the battery evaporator (24) is a temperature of 0 ° C. or less. And cooling system. Furthermore, the refrigerant evaporation temperature in the battery evaporator (24) is 0 ° C. or lower, and the refrigerant evaporation temperature in the air conditioning evaporator (17) is higher than 0 ° C. The cooling system according to claim 1 or 2 . The refrigeration cycle (10) flows out of a radiator (12) that radiates high-pressure refrigerant, a branching portion (15) that divides the refrigerant flow downstream of the radiator (12), and an air conditioning evaporator (17). Downstream decompression means (22) for decompressing the refrigerant, and a junction (28) for joining the flow of the refrigerant flowing out of the downstream decompression means (22) and the flow of the refrigerant flowing out of the battery evaporator (24) )
The air conditioning evaporator (17) evaporates one of the refrigerants branched at the branch (15),
The cooling system according to any one of claims 1 to 3, wherein the battery evaporator (24) evaporates the other refrigerant branched at the branch portion (15). Battery temperature detection means (37) for detecting the battery temperature (Tb) of the battery (26);
Battery target evaporation temperature determining means for determining a battery target value (TEOb) of the refrigerant evaporation temperature in the battery evaporator (24),
The battery target evaporation temperature determining means determines to increase the battery target value (TEOb) as the battery temperature (Tb) detected by the battery temperature detecting means (37) increases. The cooling system according to any one of claims 1 to 4 . A plurality of the battery temperature detection means (37) are provided,
The battery target evaporation temperature determining means determines to increase the battery target value (TEOb) as the variation in the detected values detected by the plurality of battery temperature detecting means (37) increases. 6. A cooling system according to claim 5 characterized in that:

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