JP2008055990A - Vehicular battery cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular battery cooling system capable of making cooling efficiency sufficient while suppressing noise. <P>SOLUTION: The vehicular battery cooling system is provided with a battery 2 installed on the vehicle and used for traveling; a blower fan 4 provided separately from an in-cabin air-conditioner and generating blown air to the battery 2; and a heat exchanger (evaporator 3) provided separately from the in-cabin air conditioner and cooling the blown air by heat exchange of a coolant flowing at the inside and the blown air fed to the battery 2. The evaporator 3, i.e., the heat exchanger also uses the coolant with in-cabin air-conditioning. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a vehicle battery cooling system for cooling a traveling battery installed in a vehicle.

Conventionally, a cooling device cools a battery by sucking air in a vehicle compartment that is air-conditioned by an air conditioner with a cooling fan. In this cooling device, a circulation mode in which the cooling air is returned to the vehicle interior by the switching damper, an exhaust mode in which the cooling air is discharged to the outside of the vehicle, and a circulation / exhaust mode in which a part of the cooling air is returned to the vehicle interior and the rest is discharged to the outside of the vehicle. Can be selected, and the air flow of the cooling fan and the switching damper are controlled based on the operating condition of the air conditioner, the air condition of the passenger compartment, the battery temperature, etc., and the battery while suppressing the pressure drop in the passenger compartment and the increase of the air conditioning load. (For example, refer to Patent Document 1).
Japanese Patent No. 3240973 (page 1-13, all figures)

  However, in the past, at the maximum performance, the control was performed to maximize the air volume, and as a result, the noise of the cooling fan increased with the increase in the air volume.

  The present invention has been made paying attention to the above-mentioned problems, and an object of the present invention is to provide a vehicle battery cooling system capable of improving cooling efficiency while suppressing noise.

  In order to achieve the above object, in the present invention, a battery installed in a vehicle and used for traveling and a vehicle interior air conditioner are provided separately, and a blower that generates air to the battery and a vehicle interior air conditioner are provided separately. And a heat exchanger that cools the air by heat exchange between the refrigerant flowing inside and the air sent to the battery.

  Therefore, in the present invention, the battery can be cooled with good cooling efficiency while suppressing noise.

  Embodiments for realizing a vehicle battery cooling system according to the present invention will be described below as a first embodiment corresponding to the first and second aspects of the invention and a second embodiment corresponding to the first and second aspects of the invention. Embodiments 3 and 4 corresponding to the inventions according to claims 1, 2 and 5, Embodiment 5 corresponding to the inventions according to claims 1, 2, 4 and 5, and Inventions according to claims 1 and 3 Example 6, corresponding to the invention according to claims 1, 3 and 4, Example 8 corresponding to the invention according to claims 1, 3 and 5, and Claims 1, 3, A description will be given based on the ninth embodiment corresponding to the inventions according to the fourth and fifth aspects.

First, the configuration will be described.
FIG. 1 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system according to the first embodiment. FIG. 2 is an explanatory diagram of a battery installation position in the vehicle battery cooling system according to the first embodiment.
The vehicle battery cooling system according to the first embodiment includes a battery case 1, a battery 2, an evaporator 3, a blower fan 4, an intake duct 5, and an exhaust duct 6 as main components.
As shown in FIG. 2, the battery case 1 is a structural member for fixing the battery 2 above the vehicle body panel 7 below the vehicle trunk or floor, and is also a protective member for protecting the battery 2 against the surroundings. is there. The battery case 1 does not have to cover the entire surface of the battery 2 but supports the battery 2 directly or indirectly.

The battery 2 is a lithium ion battery that performs charging and discharging by exchanging lithium ions between electrodes. Lithium-ion batteries have the advantageous feature that no so-called memory effect occurs.
The battery 2 used for running the vehicle is an assembled battery in which a plurality of lithium ion batteries are combined in series.
Japanese Patent Application Laid-Open No. 2005-116427 is given as a detailed example of the battery pack for traveling. The structure of the assembled battery is not limited to this detailed example, but a plurality of the minimum units that combine plate-like lithium ion batteries are used. The total number reaches several dozen.

As shown in FIG. 1, the evaporator 3 is provided in the middle of an intake duct 5 that sends air from the passenger compartment to the battery case 1, and performs heat exchange between refrigerant supplied and recovered by the air conditioner system and ambient air. is there.
The blower fan 4 is provided in the middle of the intake duct 5 for sending air from the passenger compartment to the battery case 1 and upstream of the evaporator 3. The blower fan 4 blows air to the evaporator 3 and exchanges cooling air heat-exchanged by the evaporator 3 to the battery 2. It is intended to send.
That is, separately from the vehicle interior air conditioning, the evaporator 3 and the blower fan 4 are provided in the middle of the intake duct 5 for battery cooling.

In the vehicle battery cooling system according to the first embodiment, charging / discharging of the battery, temperature management, and the like are performed by a controller (not shown).
The refrigerant control of the evaporator 3 is desirably controlled by a controller of the air conditioner system.
The blower fan 4 may be controlled by a controller for charging / discharging the battery or the controller of the air conditioner system.

The air intake duct 5 has a front end connected to the rear part of the vehicle interior to form an air flow path so as to suck in air, and a rear end connected to the vehicle front side of the battery case 1 so that the air in the vehicle interior is connected to the battery case 1. To send to. Note that a portion for collecting intake air may be provided around or in the vicinity of the evaporator 3 and the blower fan 4.
The exhaust duct 6 has a front end connected to the vehicle rear side opposite to the vehicle front side of the battery case 1 to which the intake duct 5 is connected, and a rear end arranged at the lower part of the vehicle and opened to the outside of the vehicle compartment. To do. Thus, an air discharge path from the inside of the battery case 1 to the outside is formed.

FIG. 3 is an explanatory diagram of an air conditioner system that cooperates with the vehicle battery cooling system of the first embodiment.
Here, an air conditioner system that performs refrigerant control in cooperation with the first embodiment will be described with reference to FIG.
The air conditioner system that performs coordinated control with the first embodiment sends the high-pressure refrigerant compressed by the electric compressor 102 to the condenser 101 to radiate and cool it to liquefy the refrigerant, and then remove moisture and dust in the liquid tank 103 to convert the liquefied refrigerant to The refrigerant flow to the electromagnetic valve 8 and the distribution refrigerant flow to the refrigerant line 201 toward the air conditioning evaporator 106 and the refrigerant line 203 toward the battery cooling evaporator 3 are controlled. Then, the refrigerant is expanded to a low pressure by a valve (not shown), the refrigerant is evaporated by the air-conditioning evaporator 106, the air sent from the fan 104 to the passenger compartment is cooled, and the evaporated low-pressure refrigerant is collected by the refrigerant lines 202 and 204 to be electrically operated. It is circulated by being sent to the compressor 102.

The electric compressor 102 and the electromagnetic valve 8 are controlled by a controller 105 in the air conditioner system. Description of sensors etc. is omitted. The controller 105 of the air conditioner system communicates with a controller of the battery 2 (not shown) by in-vehicle communication or the like, communicates necessary information and commands, and controls the refrigerant flow rate by the electromagnetic valve 8.
A valve for expanding the refrigerant to a low pressure is also provided in the refrigerant line 203 (not shown). Further, it may be provided integrally with the electromagnetic valve 8.

The operation will be described.
[Driving battery cooling]
The vehicle battery cooling system according to the first embodiment is used for a hybrid vehicle or an electric vehicle.
The battery 2 used for traveling generates heat due to charging / discharging during traveling, and reaches a high temperature by repeating this charging / discharging.
For example, in a lithium ion battery, when the temperature is high, deterioration, peeling of members forming the gaps, precipitation of impurities, and the like occur, resulting in a decrease in battery capacity and a lifetime. In the worst case, it will be damaged.

For this reason, in a lithium ion battery, it is necessary to cool it to about 50 degrees or less in order to exhibit good battery performance.
Other batteries need to be cooled for the same reason.
You can think of the air cooling device by the driving wind and blower generated by the vehicle running, but as the demand for driving performance to the vehicle becomes higher, the lighter and larger capacity of the battery will be required, and more Aggressive cooling is needed.

  The vehicle battery cooling system according to the first embodiment solves such a problem and keeps the battery at a temperature at which good performance can be exerted by aggressive cooling, and further improves the cooling efficiency while suppressing noise. Cool the battery.

(a) Positive cooling action In the vehicle battery cooling system of the first embodiment, the blower fan 4 sucks in the passenger compartment air, cools the sucked air with the evaporator 3, and sends the cooling air to the battery 2 for cooling. Do. Then, the battery 2 is cooled, and the heated air is exhausted outside the vehicle compartment and outside the battery case 1 by the exhaust duct 6.
Here, the cooling air volume is Ga, the intake air temperature of the battery case 1 is T1, the exhaust air temperature from the battery case 1 is T2, and the battery temperature is Tb.
Then, the cooling performance is proportional to the product of Ga and (T2-T1).

  In this relationship, if Ga is increased in order to improve the cooling performance, noise will be deteriorated. In Example 1, the cooling performance is improved by increasing (T2-T1). At this time, as the temperature difference between Tb and T1 increases, (T2−T1) increases. Therefore, by lowering T1, the noise is reduced while improving the cooling performance.

Since the evaporator 3 is disposed in the vicinity of the battery case 1 and cools the air in the intake duct 5 provided exclusively for battery cooling, the cooling efficiency is very high.
Since this cooling efficiency is high, in the first embodiment, the evaporator 3 and the blower fan 4 are downsized.

  Further, since cooling air is sent from the front side of the battery case 1 to the inside by the intake duct 5 and exhausted from the rear side of the battery case 1 to the outside by the exhaust duct 6, the battery is supplied with a uniform and highly effective flow of cooling air. 2 can be cooled.

Therefore, the battery 2 that has generated heat due to charging and discharging during traveling is efficiently cooled by the cooling air sent from the evaporator 3 and the blower fan 4 that exchange heat with the refrigerant from the air conditioner system.
By this active cooling, the battery 2 can be kept at an appropriate temperature, and the performance of the battery 2 can be exhibited well.
Moreover, by controlling the temperature of the battery 2 with high accuracy, it is possible to improve the life of the battery 2, that is, the capacity reduction suppression as a result.

(b) Action for suppressing noise In the vehicle battery cooling system according to the first embodiment, since the evaporator 3 is actively cooled, the blower fan 4 can be reduced in size. At the same time, control is performed so as to reduce the rotational speed of the blower fan 4 or reduce the maximum rotational speed of the blower fan 4 or the operating time by the maximum rotational speed as compared with the conventional cooling only by the fan. And suppress noise.

(c) Effect of improving vehicle mountability In the vehicle battery cooling system according to the first embodiment, the amount of cooling air can be reduced as described above, so that the blower fan 4 can be reduced in size as described above. Accordingly, the duct cross-sectional areas of the intake duct 5 and the exhaust duct 6 can be reduced. Thereby, it becomes a space-saving thing as a whole, and vehicle mounting property improves.
This is very space-saving compared with the conventional cooling by air only.

(d) Action for suppressing the influence on the fuel consumption of the vehicle The air conditioner system for supplying and recovering the refrigerant to the vehicle battery cooling system of the first embodiment is configured by the electric compressor 102 in the hybrid vehicle to drive the engine. Since it does not become a load, it is possible to promote a reduction in fuel consumption and to suppress the influence on the fuel consumption of the vehicle.

Next, the effect will be described.
In the vehicle battery cooling system of the first embodiment, the effects listed below can be obtained.

  (1) A battery 2 installed in the vehicle and used for running, and a blower fan 4 for generating air flow to the battery 2 and a refrigerant that is provided separately for the vehicle interior air conditioning and flows inside Since the heat exchanger (evaporator 3) that cools the air by heat exchange with the air sent to the battery 2 is provided, the battery can be cooled with good cooling efficiency while suppressing noise.

  (2) Since the heat exchanger is the evaporator 3 and shares the refrigerant with the vehicle interior air conditioning, the evaporator 3 can easily reduce the temperature of the air blow, and the refrigerant is shared with the vehicle interior air conditioning. Thus, the cost can be suppressed without providing a compressor, a condenser, etc., and the space and weight of the vehicle battery cooling system can be reduced.

The vehicle battery cooling system according to the second embodiment is an example in which switching is possible so that cooling air from an evaporator and a blower fan provided for battery cooling is sent into the passenger compartment.
The configuration will be described.
FIG. 4 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system of the second embodiment.
In the second embodiment, a vehicle interior air supply portion 51 of the intake duct 5 connected to the vehicle interior is provided from the middle of the intake duct 5 from the evaporator 3 to the battery case 1.
Further, a switching door 52 is provided at a branching portion of the intake duct 5 to the vehicle interior air supply portion 51 so that air from the upstream where the evaporator 3 or the like is installed flows to the vehicle interior air supply portion 51 or the battery case 1. Switch between flowing to the side.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The operation will be described.
[Improvement of cooling performance of vehicle interior air conditioning]
In the second embodiment, the cooling air from the evaporator 3 and the blower fan 4 provided for battery cooling can be sent to the vehicle interior by switching the switching door 52.
For example, when the vehicle battery cooling system according to the second embodiment is used in a hybrid vehicle, the battery 2 is charged and discharged when the vehicle is accelerated or decelerated, and the battery 2 generates heat. However, when traveling at a constant speed or in a traffic jam, the battery 2 does not generate heat.

  In such a case, the cooling air from the evaporator 3 and the blower fan 4 provided for cooling the battery is sent to the vehicle interior by switching the switching door 52, and the effect of the air conditioner used as a rear cooler on the rear seat side is delayed. It is used as a spot cooler for the rear, and it is used to improve the temperature of the top plate, which cools the vehicle compartment while it is warmed by the top plate heated by solar radiation. Thereby, the air-conditioning efficiency in the vehicle interior is further improved, and a more comfortable vehicle interior space can be provided.

  Further, the switching of the switching doors 52 may be distributed in a ratio such as 80% for the battery 2 and 20% for the vehicle interior. If it does in this way, contribution to the efficiency improvement of vehicle interior air conditioning and battery cooling will be changed according to a situation, and it will make it compatible.

Explain the effect.
The vehicle battery cooling system according to the second embodiment has the following effects in addition to the effects (1) and (2).
(4) Since the switching door 52 that distributes the cooling air from the blower fan 4 and the evaporator 3 in proportion to the portion of the intake duct 5 that goes to the battery 2 and the air supply portion 51 that goes to the vehicle interior is provided. Therefore, it is possible to contribute to the efficiency improvement of the air conditioning in the vehicle interior, and it is possible to ensure both the contribution to the efficiency improvement of the air conditioning in the vehicle interior and the battery cooling.
Since other functions and effects are the same as those of the first embodiment, description thereof is omitted.

The vehicle battery cooling system of the third embodiment is an example in which switching is possible so that cooling air after battery cooling by an evaporator and a blower fan provided for battery cooling is sent to the vehicle interior.
The configuration will be described.
FIG. 5 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system of the third embodiment.
In the third embodiment, a vehicle interior air supply portion 61 of the exhaust duct 6 connected to introduce air into the vehicle interior from the middle of the exhaust duct 6 from the battery case 1 to the outside of the vehicle interior is provided.
Further, a switching door 62 is provided at a branching portion of the exhaust duct 6 to the air supply portion 61 in the vehicle interior, and the air that has cooled the battery 2 in the battery case 1 is exhausted outside the vehicle interior or into the vehicle interior. Switch between flowing.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The operation will be described.
[Control processing that contributes to vehicle interior air conditioning]
FIG. 6 is a flowchart showing a flow of control processing of the switching door 62 executed in the vehicle battery cooling system of the third embodiment. Each step will be described below.

  In step S11, the battery temperature is measured.

  In step S12, it is determined whether or not the battery temperature is equal to or lower than a predetermined temperature. If it is equal to or lower than the predetermined temperature, the process proceeds to step S18, and if it exceeds the predetermined temperature, the process proceeds to step S13.

  In step S13, it is determined whether or not the temperature of the cooling air at the outlet of the battery case 1 is equal to or lower than the vehicle interior temperature. If the temperature is lower than the vehicle interior temperature, the process proceeds to step S14. move on.

  In step S14, it is determined whether or not the vehicle interior air conditioner system is in operation. If it is in operation, the process proceeds to step S15. If it is not in operation, the process proceeds to step S20.

  In step S15, it is determined whether or not the vehicle interior air conditioner system is in the cooling operation. If it is in the cooling operation, the process proceeds to step S16, and if not in the cooling operation, the process proceeds to step S21.

  In step S16, the switching door 62 is controlled so as to introduce the air after battery cooling into the passenger compartment.

  In step S17, the vehicle battery cooling system feeds back the air after battery cooling into the vehicle interior to the vehicle interior air conditioner system to encourage more efficient driving, and the process ends.

  In step S18, the fact that there is no need for battery cooling is fed back to the vehicle interior air conditioner system to encourage more efficient driving, and the process ends.

  In step S19, the switching door 62 is controlled to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

  In step S20, the switching door 62 is controlled so as to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

  In step S21, the switching door 62 is controlled to exhaust the air after battery cooling out of the passenger compartment, and the process ends.

[Improvement of cooling performance of vehicle interior air conditioning]
In the third embodiment, the battery is cooled in the battery case 1 by the cooling air from the evaporator 3 and the blower fan 4, and then the air to be exhausted is switched by the switching door 62 so that the exhaust to the outside of the vehicle compartment or to the inside of the vehicle compartment is performed. Make an introduction.

In that case, as shown in the process of FIG. 6, when the vehicle interior is being cooled and the air coming out of the battery case 1 is lower than the temperature in the vehicle interior, introduction into the vehicle interior is performed to contribute to vehicle interior air conditioning. .
In this case, since the battery 2 is cooled and the interior of the vehicle is further cooled with air that has absorbed heat to some extent, the thermal efficiency is greatly improved as compared with exhaust.
Further, by the processing of steps S17 and S18, the state of the switching door 62 and the battery cooling state are fed back to the vehicle interior air conditioner system, so that more efficient air conditioning is achieved, which leads to an improvement in fuel consumption of the vehicle.

Explain the effect.
The vehicle battery cooling system according to the third embodiment has the following effects in addition to the effects (1) and (2).
(5) Switching to distribute the cooling air after the battery 2 is cooled by the blower fan 4 and the evaporator 3 in a proportionate manner to the interior air supply portion 61 that goes into the vehicle interior and the exhaust duct 6 that goes outside the vehicle interior Since the door 62 is provided, it is possible to contribute to the efficiency of the air conditioning in the vehicle interior, and as a result, the fuel efficiency of the vehicle can be improved.
Since other functions and effects are the same as those of the first embodiment, description thereof is omitted.

The vehicle battery cooling system of the fourth embodiment is an example in which the cooling air that has cooled the battery 2 is also used for heating in the structure of the third embodiment.
Since the configuration is the same as that of the third embodiment, the description thereof is omitted.
The operation will be described.

  [Control processing that contributes to vehicle interior air conditioning]

  FIG. 7 is a flowchart showing a flow of control processing of the switching door 62 executed in the vehicle battery cooling system of the fourth embodiment. Each step will be described below. In addition, about the process similar to FIG. 6, the code | symbol of the same step is attached | subjected and description is abbreviate | omitted.

  In step S22, it is determined whether or not the vehicle interior air conditioner system is in operation. If it is in operation, the process proceeds to step S23, and if it is not in operation, the process proceeds to step S26.

  In step S23, it is determined whether it is a heating operation. If it is a heating operation, the process proceeds to step S24, and if it is not a heating operation, the process proceeds to step S27.

  In step S24, the switching door 62 is controlled to introduce the air after battery cooling into the passenger compartment.

  In step S25, the fact that the vehicle battery cooling system is introducing air after battery cooling into the vehicle interior is fed back to the vehicle interior air conditioner system to encourage more efficient driving, and the process is terminated.

  In step S26, the switching door 62 is controlled to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

  In step S27, the switching door 62 is controlled to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

[Improvement of cooling and heating performance of cabin air conditioning]
In the fourth embodiment, as in the third embodiment, when the air conditioning system cools the vehicle interior, when the cooling air after the battery cooling has a temperature that can contribute to the cooling of the vehicle interior, the cooling after the battery cooling is performed in the vehicle interior. Introduce wind.

Furthermore, in Example 4, when the vehicle interior air conditioning system is heating the vehicle interior, if the temperature of the cooling air after the battery cooling is higher than the temperature inside the vehicle interior, the cooling air after the battery cooling is sent to the vehicle interior. It can be introduced to contribute to the heating of the passenger compartment.
As a spot effect in this case, if the rear seat is warmed and the feet of the rear seat are further warmed, for example, not only the heating of the cabin temperature is made more efficient, but also a contribution to the sensible temperature is performed. .

Explain the effect.
The vehicle battery cooling system of the fourth embodiment has the following effects in addition to the effects (1) and (2).
(5) The cooling air after the battery 2 is cooled by the blower fan 4 and the evaporator 3 is distributed in a proportionate manner to the vehicle interior air supply portion 61 going into the vehicle compartment and the exhaust duct 6 going out of the vehicle compartment. Since the switching door 62 is provided, it is possible to contribute to efficiency of cooling and heating as air conditioning in the vehicle interior.
Since other functions and effects are the same as those of the third embodiment, description thereof is omitted.

In the vehicle battery cooling system of the fifth embodiment, the cooling air before the battery cooling by the evaporator and the blower fan provided for battery cooling can be switched to be sent to the vehicle interior, and the cooling air after the battery cooling is sent to the vehicle interior. This is an example of switching freely.
The configuration will be described.
FIG. 8 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system of the fifth embodiment.

  In the fifth embodiment, a vehicle interior air supply portion 51 of the intake duct 5 connected to the vehicle interior is provided from the middle of the intake duct 5 from the evaporator 3 to the battery case 1, and a branch portion to the vehicle interior air supply portion 51 is provided. A switching door 52 is provided to switch whether the air from the upstream where the evaporator 3 or the like is installed flows to the vehicle interior air supply portion 51 or to the battery case 1 side.

Furthermore, in the fifth embodiment, a vehicle interior air supply portion 61 of the exhaust duct 6 that is connected to introduce air into the vehicle interior from the middle of the exhaust duct 6 from the battery case 1 to the outside of the vehicle interior is provided. A switching door 62 is provided at a branching portion to 61 so that the air that has cooled the battery 2 in the battery case 1 is switched between exhausting to the outside of the passenger compartment or flowing into the passenger compartment.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The operation will be described.
[Control processing that contributes to vehicle interior air conditioning]
FIG. 9 and FIG. 10 are flowcharts showing the flow of control processing of the switching door 52 and the switching door 62 executed in the vehicle battery cooling system of the fifth embodiment. Each step will be described below.

  In step S31, the battery temperature is measured.

  In step S32, it is determined whether or not the battery temperature is equal to or lower than a predetermined temperature. If it is equal to or lower than the predetermined temperature, the process proceeds to step S49 (indicated by symbol 10 in FIGS. 9 and 10). If so, the process proceeds to step S33.

  In step S33, it is determined whether or not the temperature of the cooling wind at the outlet of the battery case 1 is equal to or lower than the vehicle interior temperature. If the temperature is lower than the vehicle interior temperature, the process proceeds to step S34. move on.

  In step S34, it is determined whether or not the vehicle interior air conditioner system is in operation. If it is in operation, the process proceeds to step S35, and if it is not in operation, the process proceeds to step S39.

  In step S35, it is determined whether or not the vehicle interior air conditioner system is in the cooling operation. If the cooling operation is being performed, the process proceeds to step S36, and if not, the process proceeds to step S40.

  In step S36, it is determined whether or not the air volume in the vehicle interior air conditioner system is greater than or equal to a predetermined air volume. If the air volume is greater than or equal to the predetermined air volume, the process proceeds to step S37, and if not, the process proceeds to step S41.

  In step S37, the switching door 52 is made to send cooling air to the vehicle interior (the first RR outlet is opened), and the switching door 62 is made to exhaust cooling air outside the compartment (the second RR outlet). Is closed).

  In step S38, the fact that the vehicle battery cooling system is introducing air before battery cooling into the vehicle interior is fed back to the vehicle interior air conditioner system to encourage more efficient driving, and the process ends.

  In step S39, the switching door 62 is controlled to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

  In step S40, the switching door 62 is controlled to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

  In step S41, the switching door 52 is sent to the inside of the battery case 1 (the first RR outlet is closed), and the switching door 62 is sent to the passenger compartment (the second RR outlet). Mouth open).

  In step S42, the vehicle battery cooling system feeds back the air after battery cooling into the vehicle interior to the vehicle interior air conditioner system to encourage more efficient driving, and the process ends.

  In step S43, it is determined whether or not the vehicle interior air conditioner system is in operation. If it is in operation, the process proceeds to step S44, and if it is not in operation, the process proceeds to step S47.

  In step S44, it is determined whether or not the vehicle interior air conditioner system is in the heating operation. If it is in the heating operation, the process proceeds to step S45, and if it is not in the heating operation, the process proceeds to step S48.

  In step S45, the switching door 62 is controlled to introduce the air after battery cooling into the vehicle interior.

  In step S46, the fact that the vehicle battery cooling system introduces the air after battery cooling into the vehicle interior is fed back to the vehicle interior air conditioner system to encourage more efficient driving, and the process ends.

  In step S47, the switching door 62 is controlled to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

  In step S48, the switching door 62 is controlled to exhaust the air after battery cooling to the outside of the passenger compartment, and the process ends.

  In step S49, it is determined whether or not the vehicle interior air conditioner system is in operation. If it is in operation, the process proceeds to step S50, and if it is not in operation, the process proceeds to step S53.

  In step S50, it is determined whether or not the vehicle interior air conditioner system is in the cooling operation. If it is in the cooling operation, the process proceeds to step S51, and if not in the cooling operation, the process proceeds to step S54.

  In step S51, the switching door 52 is made to send cooling air to the vehicle interior (the first RR outlet is opened), and the switching door 62 is made to discharge cooling air outside the passenger compartment (the second RR outlet). Is closed).

  In step S52, the fact that the vehicle battery cooling system is introducing air before battery cooling into the vehicle interior is fed back to the vehicle interior air conditioning system to encourage more efficient driving, and the process is terminated.

  In step S53, the control not to contribute to the vehicle interior air conditioning is fed back to the vehicle interior air conditioner system to encourage more efficient driving, and the process ends.

  In step S54, the control not to contribute to the vehicle interior air conditioning is fed back to the vehicle interior air conditioner system to encourage more efficient driving, and the process is terminated.

[Improvement of cooling and heating performance of cabin air conditioning]
In the fifth embodiment, when the cooling air after the battery cooling is higher than the air in the passenger compartment, the cooling air after the battery cooling is introduced into the passenger compartment so as to contribute to the efficiency of heating in the passenger compartment (steps S44 to S44). S46).
Further, when the necessity for cooling the battery 2 is small, that is, when the temperature of the battery 2 is lower than a predetermined temperature, the cooling air for cooling the battery 2 by the evaporator 3 and the blower fan 4 is switched before the battery cooling, It is sent to the passenger compartment to contribute to the efficiency of cooling the passenger compartment (steps S50 to S52).

Further, when the battery temperature exceeds the predetermined temperature, basically, when the cooling air after cooling the battery 2 is lower than the vehicle interior temperature, it is made to contribute to the efficiency of air conditioning in the vehicle interior (step S41).
However, when the air conditioner system for the vehicle interior is in a cooling state and the air flow rate is greater than or equal to the predetermined air flow rate, that is, when very strong cooling is required, the cooling air before cooling the battery 2 is introduced into the vehicle interior. Let
As a result, the vehicle interior air conditioner system can perform more efficient operation.

In this case, 100% switching may be performed as shown in step S37, or the air distribution ratio may be, for example, 80% introduction into the vehicle interior and 20% battery 2. . Further, stepwise switching may be performed.
Since other functions and effects are the same as those of the first embodiment, description thereof is omitted.

Explain the effect.
The vehicle battery system according to the fifth embodiment has the following effects in addition to the effects (1) and (2).
(5) A switching door 52 that distributes the cooling air from the blower fan 4 and the evaporator 3 in proportion to the portion of the intake duct 5 toward the battery 2 and the air supply portion 51 in the vehicle interior toward the vehicle interior. A switching door that distributes the cooling air after the battery 2 is cooled by the blower fan 4 and the evaporator 3 in a proportionate manner to the vehicle interior air supply portion 61 that goes into the vehicle interior and the exhaust duct 6 that goes outside the vehicle compartment 62, when the air volume of the air conditioner system for the vehicle interior exceeds a predetermined air volume and the load is high, the cooling air before cooling the battery 2 is introduced into the vehicle interior, so that the battery is sufficiently cooled, It can contribute to the efficiency improvement of the air conditioning system.
Since other functions and effects are the same as those of the first embodiment, description thereof is omitted.

The vehicle battery cooling system according to the sixth embodiment configures a closed system using liquid refrigerant as a refrigerant for cooling the battery, and first cools the liquid refrigerant for battery cooling with the refrigerant of the air conditioner system in the vehicle interior. It is the example which provided the 2nd heat exchanger for producing | generating the heat exchanger and the cooling air which cools a battery.
The configuration will be described.

FIG. 11 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system of the sixth embodiment.
In the sixth embodiment, the refrigerant lines 203 and 204 from the vehicle interior air conditioner system are connected to the heat exchanger 31, and the liquid refrigerant such as LLC for battery cooling is cooled by the refrigerant of the vehicle interior air conditioner system.

This liquid refrigerant circulates in the liquid refrigerant line 9 by the electric pump 81 and cools the air blown to the battery 2 by the evaporator 32 provided downstream of the blower fan 4 in the intake duct 5.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The operation will be described.
[Suppressing rapid temperature changes]
In the vehicle battery cooling system of the sixth embodiment, the heat exchanger 31 performs heat exchange between the refrigerant and a liquid refrigerant such as LLC, cools the LLC, and cools the blown air by the evaporator 32 using the cooled LLC. Then, the battery 2 is cooled.

  The battery 2 gradually rises in temperature due to repeated charging and discharging, but the cooling air from the refrigerant changes in temperature relatively abruptly, so control to alleviate this is necessary. In the sixth embodiment, the temperature change of the cooling wind is changed to a battery by using a refrigerant that is heat-exchanged to a liquid refrigerant such as LLC, which is dull in temperature sensitivity, with respect to a refrigerant that is normally in a gaseous state and undergoes a rapid temperature change. It is a gentle one suitable for temperature change of 2, and an accurate cooling is performed even with simple control.

Explain the effect.
The vehicle battery cooling system according to the sixth embodiment has the following effects in addition to the effect (1).
(3) The refrigerant of the evaporator 32 that cools the battery 2 is a liquid refrigerant that is circulated for battery cooling, and the heat exchanger 31 that cools the liquid refrigerant with a refrigerant for air conditioning in the vehicle interior is provided. , Accurate battery cooling can be performed.
Since other functions and effects are the same as those of the first embodiment, description thereof is omitted.

The vehicle battery cooling system according to the seventh embodiment is an example in which the battery is cooled by the cooling air generated by the liquid refrigerant, and switching is performed so that the cooling air before the battery cooling is introduced into the vehicle interior.
The configuration will be described.
FIG. 12 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system of the seventh embodiment.

In the seventh embodiment, the liquid refrigerant circulating in the liquid refrigerant line 9 is cooled by the heat exchanger 31 with the refrigerant of the air conditioner system for the vehicle interior, and the battery 32 is generated by the evaporator 32.
Further, in the seventh embodiment, a vehicle interior air supply portion 51 of the intake duct 5 connected to the vehicle interior is provided in the middle of the intake duct 5 from the evaporator 32 to the battery case 1.
Further, a switching door 52 is provided at a branching portion of the intake duct 5 to the vehicle interior air supply portion 51, and air from the upstream where the evaporator 32 or the like is installed flows to the vehicle interior air supply portion 51, or the battery case 1 Switch to the side.
Since other configurations are the same as those of the sixth embodiment, description thereof is omitted.

The operation will be described.
[Suppressing rapid temperature changes and improving cooling performance of vehicle interior air conditioning]
In the seventh embodiment, the liquid refrigerant for cooling the battery is cooled by the refrigerant of the air conditioner system for the passenger compartment, the rapid temperature change is suppressed, the battery is accurately cooled by easy control, and the cooling of the battery is performed. When there is little necessity, the cooling air before battery cooling is sent to the vehicle interior by the switching door 52 to improve the cooling performance of the vehicle interior air conditioning.

Explain the effect.
The vehicle battery cooling system according to the seventh embodiment has the following effects in addition to the effects (1) and (3).
(4) ′ The refrigerant of the evaporator 32 that cools the battery 2 is a liquid refrigerant that is circulated for battery cooling, and includes a heat exchanger 31 that cools the liquid refrigerant with a refrigerant for air conditioning in the vehicle interior. A switching door 52 that distributes the cooling air from the evaporator 32 in proportion to the portion of the intake duct 5 directed toward the battery 2 and the air supply portion 51 directed toward the vehicle interior is provided with an easy control. Accurate battery cooling can be performed, and the cooling performance of the vehicle interior air conditioning can be improved.
Since other functions and effects are the same as those of the sixth embodiment, description thereof is omitted.

The vehicular battery cooling system according to the eighth embodiment is an example in which the battery is cooled with cooling air generated by liquid refrigerant, and switching is performed so that the cooling air after battery cooling is introduced into the vehicle interior.
The configuration will be described.
FIG. 13 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system of the eighth embodiment.

In the eighth embodiment, the liquid refrigerant circulating in the liquid refrigerant line 9 is cooled by the heat exchanger 31 with the refrigerant of the air conditioner system for the passenger compartment, and the evaporator 32 generates the battery cooling air.
Further, in the eighth embodiment, a vehicle interior air supply portion 61 of the exhaust duct 6 connected to introduce air into the vehicle interior from the middle of the exhaust duct 6 from the battery case 1 to the outside of the vehicle interior is provided.
Further, a switching door 62 is provided at a branching portion of the exhaust duct 6 to the air supply part 61 in the vehicle interior, and the air that has cooled the battery 2 in the battery case 1 is exhausted outside the vehicle interior, or inside the vehicle interior. Switch between flowing.
Since other configurations are the same as those of the sixth embodiment, description thereof is omitted.

The operation will be described.
[Suppressing rapid temperature changes and improving cooling performance of vehicle interior air conditioning]
In the eighth embodiment, the liquid refrigerant for cooling the battery is cooled by the refrigerant of the air conditioner system for the passenger compartment, and the rapid temperature change is suppressed, and accurate battery cooling is performed with easy control.
Furthermore, the vehicle battery cooling system according to the eighth embodiment has an effect of contributing to the efficiency of cooling in the vehicle interior air conditioning by the control process shown in FIG.
In addition, the control process shown in FIG. 7 also has an effect of contributing to efficiency of cooling and heating in the air conditioning in the passenger compartment.

Explain the effect. The vehicle battery cooling system according to the eighth embodiment has the following effects in addition to the effects (1) and (3).
(5) The refrigerant of the evaporator 32 that cools the battery 2 is a liquid refrigerant that is circulated for battery cooling, and is provided with a heat exchanger 31 that cools the liquid refrigerant with a refrigerant for air conditioning in the vehicle interior. 4 and the switching door 62 that distributes the cooling air after the battery 2 is cooled by the evaporator 32 to the vehicle interior air supply portion 61 that goes into the vehicle interior and the exhaust duct 6 that goes outside the vehicle compartment in a proportionate manner. Thus, it is possible to perform accurate battery cooling with easy control, and it is possible to contribute to cooling as vehicle interior air conditioning, or efficiency of cooling and heating.
Since other functions and effects are the same as those of the sixth embodiment, description thereof is omitted.

The vehicle battery cooling system according to the ninth embodiment is an example in which the battery is cooled by cooling air generated by liquid refrigerant, and switching is performed so that cooling air before and after battery cooling is introduced into the vehicle interior.
FIG. 14 is an explanatory diagram of a battery cooling structure in the vehicle battery cooling system according to the ninth embodiment.
In the ninth embodiment, the liquid refrigerant circulating in the liquid refrigerant line 9 is cooled by the heat exchanger 31 with the refrigerant of the air conditioner system for the passenger compartment, and the evaporator 32 generates the battery cooling air.

  In the ninth embodiment, a vehicle interior air supply portion 51 of the intake duct 5 connected to the vehicle interior is provided from the middle of the intake duct 5 from the evaporator 32 to the battery case 1, and a branch portion to the vehicle interior air supply portion 51 is provided. A switching door 52 is provided to switch whether the air from the upstream where the evaporator 32 or the like is installed flows to the vehicle interior air supply portion 51 or to the battery case 1 side.

Further, in the ninth embodiment, a vehicle interior air supply portion 61 of the exhaust duct 6 that is connected to introduce air into the vehicle interior from the middle of the exhaust duct 6 from the battery case 1 to the outside of the vehicle interior is provided. A switching door 62 is provided at the branching portion to 61 so that the air that has cooled the battery 2 in the battery case 1 is switched between exhausting to the outside of the passenger compartment or flowing into the passenger compartment.
Since other configurations are the same as those of the sixth embodiment, description thereof is omitted.

The operation will be described.
[Suppressing rapid temperature changes and improving cooling performance of vehicle interior air conditioning]
In the ninth embodiment, the liquid refrigerant for cooling the battery is cooled by the refrigerant of the air conditioner system for the passenger compartment, and the rapid temperature change is suppressed, and the battery is accurately cooled by easy control.
Furthermore, the vehicle battery cooling system according to the ninth embodiment has an effect of contributing to the efficiency of cooling and heating in the air conditioning of the vehicle interior by the control processing shown in FIGS.
The details of the action that contributes to the efficiency of cooling and heating by the control processing of FIGS. 9 and 10 are the same as those in the fifth embodiment, and thus the description thereof is omitted.

Explain the effect. The vehicle battery cooling system according to the ninth embodiment has the following effects in addition to the effects (1) and (3).
(5) The refrigerant of the evaporator 32 that cools the battery 2 is a liquid refrigerant that is circulated for battery cooling, and is provided with a heat exchanger 31 that cools the liquid refrigerant with a refrigerant for air conditioning in the vehicle interior. A switching door 52 that distributes the cooling air from the fan 4 and the evaporator 32 in proportion to the portion of the intake duct 5 toward the battery 2 and the air supply portion 51 in the vehicle interior toward the vehicle interior;
A switching door 62 that distributes the cooling air after cooling the battery 2 by the blower fan 4 and the evaporator 3 in a proportionate manner to the interior air supply portion 61 that goes into the vehicle interior and the exhaust duct 6 that goes outside the vehicle interior. Since it is provided, it is possible to perform accurate battery cooling with easy control, and it is possible to contribute to cooling as vehicle interior air conditioning, or efficiency of cooling and heating.
Since other functions and effects are the same as those of the sixth embodiment, description thereof is omitted.

As mentioned above, although the vehicle battery cooling system of the present invention has been described based on the first to ninth embodiments, the specific configuration is not limited to these embodiments, and each claim of the claims Design changes and additions are permitted without departing from the spirit of the invention according to the paragraph.
Although the vehicle battery cooling system of the embodiment has been described as being used for a hybrid vehicle or an electric vehicle, the vehicle battery cooling system may be used for a fuel cell vehicle, for example.

It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 1. FIG. It is explanatory drawing of the battery installation position in the battery cooling system for vehicles of Example 1. FIG. It is explanatory drawing of the air conditioning system which cooperates with the battery cooling system for vehicles of Example 1. FIG. It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 2. FIG. It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 3. FIG. 12 is a flowchart showing a flow of control processing of a switching door 62 executed in the vehicle battery cooling system of the third embodiment. It is a flowchart which shows the flow of the control processing of the switching door 62 performed with the vehicle battery cooling system of Example 4. FIG. It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 5. FIG. It is a flowchart which shows the flow of the control processing of the switch door 52 and the switch door 62 performed with the battery cooling system for vehicles of Example 5. FIG. It is a flowchart which shows the flow of the control processing of the switch door 52 and the switch door 62 performed with the battery cooling system for vehicles of Example 5. FIG. It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 6. FIG. It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 7. FIG. It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 8. FIG. It is explanatory drawing of the battery cooling structure in the battery cooling system for vehicles of Example 9. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery case 2 Battery 3 Evaporator 4 Blower fan 5 Intake duct 6 Exhaust duct 7 Body panel 8 Solenoid valve 9 Liquid refrigerant line 31 Heat exchanger 32 Evaporator 51 Car interior air supply part 52 Switching door 61 Car interior air supply part 62 Switching door 81 Electric pump 101 Condenser 102 Electric compressor 103 Liquid tank 104 Fan 105 Controller 106 Air conditioning evaporator 201 Refrigerant line 202 Refrigerant line 203 Refrigerant line 204 Refrigerant line

Claims (5)

A battery installed in a vehicle and used for traveling;
A blower that is provided separately from the vehicle interior air conditioner and generates air to the battery;
A heat exchanger that is provided separately from the vehicle interior air conditioner and cools the air by heat exchange between the refrigerant flowing inside and the air sent to the battery;
A battery cooling system for a vehicle, comprising: The vehicle battery cooling system according to claim 1,
The heat exchanger is an evaporator, and uses a vehicle interior air conditioner and a refrigerant.
A vehicle battery cooling system. The vehicle battery cooling system according to claim 1,
The refrigerant of the heat exchanger that cools the battery is a liquid refrigerant that is circulated for battery cooling,
A liquid refrigerant heat exchanger that cools the liquid refrigerant with a refrigerant for air conditioning in a vehicle interior is provided.
A vehicle battery cooling system. The vehicle battery cooling system according to any one of claims 1 to 3,
The cooling air from the blower and the heat exchanger is provided with air distribution means that distributes air in a proportionate manner to the air passage toward the battery and the air passage toward the vehicle interior.
A vehicle battery cooling system. In the vehicle battery cooling system according to any one of claims 1 to 4,
Cooling air after cooling the battery by the blower and the heat exchanger is provided with air distribution means that distributes the air in a proportionate manner to the air flow path toward the vehicle interior and the air exhaust path toward the outside of the vehicle interior,
A vehicle battery cooling system.

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