JP2008062875A - Battery cooling system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery cooling system for a vehicle having excellent cooling efficiency while suppressing noise. <P>SOLUTION: This battery cooling system comprises a battery 2 mounted on a vehicle and used for travelling, a heat pipe heat-absorbing part 3 installed closely to the side of a battery case 1b in which the battery 3 is contained and absorbing heat by a refrigerant flowing therein, a heat pipe heat-dissipating part 4 installed on the outside of a cabin and dissipating heat by the refrigerant flowing therein, and connection parts 6, 7 for connecting the heat pipe heat-absorbing part 3 to the heat pipe heat-dissipating part 4 so that the refrigerant can be circulated therein. A heat pipe in which the refrigerant is circulated due to the condensation and evaporation of the refrigerant is formed of the heat pipe heat-absorbing part 3, the heat pipe heat-dissipating part 4, and the connection parts 6, 7. <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 problems, and an object of the present invention is to provide a vehicle battery cooling system that can cool a battery satisfactorily while suppressing noise.

  In order to achieve the above object, in the present invention, a battery installed in a vehicle and used for traveling, a heat absorption path provided near the side portion of the battery for absorbing heat by flowing a refrigerant therein, and outside the passenger compartment A heat radiation path that dissipates heat by flowing a refrigerant therein, and a connection path that connects the heat absorption path and the heat radiation path so that the refrigerant can circulate freely, the heat absorption path, the heat radiation path, and the connection path. The heat pipe in which the refrigerant circulates by condensation and evaporation of the refrigerant is configured.

  Therefore, in the present invention, it is possible to cool the battery satisfactorily while suppressing noise.

  Embodiments for realizing a vehicle battery cooling system according to the present invention will now be described with reference to the first embodiment corresponding to the first, second, and seventh embodiments, and the second embodiment corresponding to the first to fourth embodiments. A third embodiment corresponding to the invention according to claims 1 to 5 and a fourth embodiment corresponding to the invention according to claims 1 to 6 will be described.

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. FIG. 3 is an explanatory perspective view of the battery cooling structure in the vehicle battery cooling system of the first embodiment. FIG. 4 is an explanatory perspective view of the battery cooling structure portion on the vehicle body panel in the battery cooling system of the first embodiment.

The vehicle battery cooling system according to the first embodiment includes a battery case 1a, an assembled battery case 1b, a battery 2, a heat pipe heat absorption unit 3, a heat pipe heat dissipation unit 4, a solenoid valve 5, and connection units 6 and 7. .
As shown in FIGS. 2 and 3, the battery case 1a is a structural member for fixing the assembled battery case 1b that accommodates the battery 2 inside the vehicle body panel 8 above the vehicle body panel 8 below the vehicle trunk and the floor. It is a protective member that protects the assembled battery case 1b and the battery 2 with respect to the surroundings. The battery case 1a does not have to cover the entire surface of the assembled battery case 1b, but forms at least a bottom surface and indirectly supports the battery 2 via the assembled battery case 1b.

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 driving the vehicle is an assembled battery in which a plurality of lithium ion batteries are combined in series. And the some battery 2 is accommodated in the assembled battery case 1b as an assembled battery.
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 (see FIG. 4) combined with plate-like lithium ion batteries are used. The total number reaches several dozen.

The heat pipe heat absorption part 3 forms an internal space for allowing the refrigerant to pass therethrough and has a tubular shape extending in the longitudinal direction of the battery 2. And it arrange | positions so that the heat | fever of the battery 2 may be absorbed inside the battery case 1a on the vehicle body panel 8. FIG.
The heat pipe heat dissipating part 4 forms an internal space for allowing the refrigerant to pass therethrough, and has a tubular shape extending along the traveling direction of the vehicle. And it provides in the lower surface side of the vehicle body panel 8 so as to oppose the heat pipe heat absorption part 3, and radiates the heat | fever of a refrigerant | coolant outside.
Further, a plurality of plate-like objects are arranged on the outer periphery of the heat pipe heat radiating section 4 at an appropriate interval to form the heat radiating section 41 of the heat pipe heat radiating section 4.

Next, the internal passages of the heat pipe heat absorbing part 3 and the heat pipe heat radiating part 4 are connected by the connecting part 6 at the end of the heat pipe heat absorbing part 3 and the heat pipe heat radiating part 4 on the vehicle front side. The connecting portion 6 is provided so as to penetrate the vehicle body panel 8.
Further, at the end of the heat pipe heat absorbing portion 3 and the heat pipe heat radiating portion 4 on the vehicle rear side, the internal passage of the heat pipe heat absorbing portion 3 and the heat pipe heat radiating portion 4 is connected by the connecting portion 7. The connecting portion 7 is provided so as to penetrate the vehicle body panel 8.

Therefore, the heat pipe heat absorption part 3, the heat pipe heat radiation part 4, and the connection parts 6 and 7 form a refrigerant circulation path, that is, a heat pipe.
Moreover, in Example 1, as shown in FIG. 3, with respect to the combination of the some assembled battery case 1b and the heat pipe heat absorption part 3, one heat pipe thermal radiation part provided in the lower part of the lower case part of the battery case 1 4 is used to handle the heat radiation side.
Next, an electromagnetic valve 5 that controls the amount of refrigerant to be circulated in the middle of the connecting portion 6 is provided.

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).
Therefore, it is preferable to control the electromagnetic valve 5 with the above controller.

  Further, as shown in FIG. 3, the circulation path of the refrigerant formed by the heat pipe heat absorbing portion 3, the heat pipe heat radiating portion 4, and the connecting portions 6 and 7 is provided on both sides of the assembled battery case 1 b that accommodates each battery 2. Try to provide it.

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 refrigerant passes through the heat pipe heat absorption part 3 so that the heat pipe heat absorption part 3 cools the ambient temperature, and the battery 2 This heat is absorbed through the assembled battery case 1b.
The refrigerant whose temperature has risen due to heat absorption moves from the front end portion of the heat pipe heat absorption portion 3 to the front end portion of the heat pipe heat dissipation portion 4 via the connection portion 6 and the electromagnetic valve 5 and moves to the rear of the heat pipe heat dissipation portion 4. Will do.

  Since the heat pipe heat radiating portion 4 is provided below the vehicle body panel 8, it is cooled by the traveling wind and the ambient temperature outside the vehicle, and the heat radiation proceeds. Furthermore, since the heat pipe heat radiating section 4 is provided with a plurality of heat radiating sections 41, heat radiation is efficiently performed by widening the heat radiation area.

The refrigerant cooled by the heat radiation by the heat pipe heat radiating section 4 moves from the rear end portion of the heat pipe heat radiating section 4 to the rear end portion of the heat pipe heat absorbing section 3 via the connection section 7, and further the heat pipe heat absorbing section. 3 is moved to the front to absorb heat.
The circulating flow of the refrigerant is generated without a pump driven by condensation due to heat dissipation (cooling) of the refrigerant and evaporation due to heat absorption (heating). In addition, since the circulation amount of the refrigerant is controlled by the electromagnetic valve 5, sufficient cooling is performed according to the heat generation of the battery 2. In addition, the amount of heat release can be freely controlled to prevent overcooling in winter.
Further, the cooling of the battery 2 by the circulation of the refrigerant is separate from the air conditioner system provided for the passenger compartment, and does not cause a load on the air conditioner system.
Further, the heat pipe heat radiating portion 4 is provided at the rear of the vehicle so as not to be affected by the engine heat, and performs good heat radiation to the outside.

  Further, a plurality of batteries 2 are accommodated in the assembled battery case 1 b, and a plurality of assembled battery cases 1 b are accommodated in the battery case 1, and the heat pipe heat absorption part 3 cools the air in the battery case 1. Therefore, this internal air is cooled before the battery 2 generates heat, and this becomes preliminary cooling, and the battery is cooled more efficiently.

Therefore, the battery 2 that has generated heat due to charging and discharging during traveling is efficiently cooled by the refrigerant circulating through the heat pipe heat absorption part 3, the heat pipe heat dissipation part 4, and the connection parts 6 and 7.
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.

(b) Action for suppressing noise In the vehicle battery cooling system of the first embodiment, the battery 2 is cooled without using a blower. Therefore, compared with the conventional cooling only by the fan, the noise is reduced to such an extent that it can be said that almost no sound is generated.

(c) Effect of improving vehicle mountability In the vehicle battery cooling system according to the first embodiment, the heat pipe heat absorbing portion 3 is only disposed on the side of the plurality of assembled battery cases 1b inside the battery case 1a. The apparatus is not increased in size.
Even in the case of cooling by conventional air blowing, it is necessary to provide an appropriate space between the assembled battery cases 1b inside the battery case 1a for ventilation of the cooling, and the space is effectively utilized in the first embodiment. Because.

Further, the battery case 1a is not greatly protruded to the outside by a blower or the like, and the overall space is saved.
As described above, the vehicle battery cooling system according to the first embodiment has improved vehicle mountability.

(d) Action for suppressing the influence on the fuel consumption of the vehicle The vehicle battery cooling system of the first embodiment does not become an engine driving load in the hybrid vehicle, so that it is possible to promote low fuel consumption. Suppress the impact on

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 a vehicle and used for traveling; a heat pipe heat absorption part 3 provided near the side part of the assembled battery case 1b that accommodates the battery 2; A heat pipe heat dissipating part 4 that is provided outside the passenger compartment and that dissipates heat by flowing a refrigerant inside, and connecting parts 6 and 7 that connect the heat pipe heat absorbing part 3 and the heat pipe heat dissipating part 4 so that the refrigerant can circulate; Since the heat pipe heat absorption part 3, the heat pipe heat radiation part 4, and the connection parts 6 and 7 constitute a heat pipe in which the refrigerant circulates due to the condensation and evaporation of the refrigerant, it is possible to cool the battery well while suppressing noise. .

  (2) Since the electromagnetic valve 5 for controlling the circulating refrigerant is provided in the middle of the heat pipe, the cooling performance as required can be maintained by setting the refrigerant circulation amount appropriately.

  (7) Since at least the heat radiating heat pipe 4 of the heat pipe is provided at the rear of the vehicle away from the engine, it is difficult to be affected by the engine heat and the heat radiating performance of the heat pipe can be ensured.

The vehicle battery cooling system of Example 2 is an example in which a heat transfer body is provided.
The configuration will be described.
FIG. 5 is an explanatory perspective view of the battery cooling structure in the vehicle battery cooling system of the second embodiment. FIG. 6 is a partially enlarged explanatory view of the battery cooling structure in the vehicle battery cooling system of the second embodiment.

In Example 2, the plate-shaped or sheet-shaped heat transfer body 9 is provided so as to be stretched over the heat pipe heat absorbing portions 3 provided on both sides of the assembled battery case 1b that houses the battery 2.
The heat transfer body 9 preferably has good heat conductivity, and both ends are in contact with the outer periphery of the heat pipe heat absorbing portion 3 with an appropriate area as shown in FIG.
The heat transfer body 9 and the heat pipe heat absorption part 3 are joined partly or entirely by welding, welding, or the like.
And the part of the heat-transfer body 9 between the both ends brought into contact with the heat pipe heat absorption part 3 is sandwiched between the batteries 2 to be stacked. Further, the heat transfer body 9 is positioned at the center in the longitudinal direction of the battery 2.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The operation will be described.
[Efficient cooling]
In Example 2, since the heat transfer body 9 is provided, the battery 2 in which the heat transfer body 9 that has transferred heat by surface contact with the heat pipe heat absorption unit 3 is stacked is cooled from the inside.
The stacked battery 2 tends to accumulate heat inside the stack. In Example 2, since the heat transfer body 9 cools from the inside in the laminated | stacked inside, efficient cooling can be obtained.
Furthermore, the position where the heat in the stacked batteries 2 tends to concentrate and accumulate is the top, bottom, left and right, and the center of the front side. In Example 2, since the central position where the generated heat is likely to accumulate can be directly cooled, the cooling efficiency is extremely improved.
Since other operations are the same as those of the first embodiment, description thereof is omitted.

Explain the effect. The vehicle battery cooling system of the second embodiment has the following effects in addition to the effects (1) and (2).
(3) Since the heat transfer body 9 for transferring the heat of the battery 2 to the heat pipe heat absorption part 3 is provided, efficient battery cooling performance can be obtained.

(4) The battery 2 is formed by stacking a plurality of batteries, and the heat transfer body 9 is positioned at the center of the inside of the stacked battery 2, so that the center of the inside where heat is likely to accumulate is located. Since it can cool directly, more efficient battery cooling performance can be obtained.
Since other effects are the same as those of the first embodiment, description thereof is omitted.

In the vehicle battery cooling system of the third embodiment, the heat transfer body is provided so as to stretch the endothermic heat pipes disposed on both sides of the battery, and the stretch is provided so as to obtain a wide contact area between the heat transfer body and the endothermic heat pipe. This is an example in which the position is brought closer to the position where the distance of the endothermic heat pipe is the shortest.
The configuration will be described.

FIG. 7 is an explanatory perspective view of the battery cooling structure in the vehicle battery cooling system of the third embodiment. FIG. 8 is a partially enlarged explanatory view of the battery cooling structure in the vehicle battery cooling system of the third embodiment.
In the third embodiment, a plate-shaped or sheet-shaped heat transfer body 9 is stretched over a heat pipe heat absorption section 3 provided close to both side portions of the battery 2, and the heat transfer body 9 is stacked. It is intended to be sandwiched inside.

Furthermore, in Example 3, the heat transfer body 9 in FIG. 6 extends linearly with respect to the heat pipe heat absorption part 3, whereas the heat transfer body 9 in FIG. 8 has a height that protrudes from the assembled battery case 1b. From the positional relationship determined from the diameter of the heat pipe heat absorption part 3, a structure like a stretch start part 91 is formed.
Specifically, the portion of the heat transfer body 9 that is brought into contact with the heat pipe heat absorbing portion 3 is formed into a bowl shape, and the stretch start portion 91 of the heat transfer body 9 is positioned at the side end portion of the bowl shape.
In other words, it is configured such that a bowl-shaped curved portion is located on the outer side and upper side of the stretching start portion 91 of the heat transfer body 9.
This is a configuration in which the contact area between the outer periphery of the heat pipe heat absorbing portion 3 and the heat transfer body 9 is larger than that in FIG. 6 (see FIG. 8). In other words, the vicinity of the start portion 91 of the heat transfer body 9 is located in the vicinity of the outer periphery of the heat pipe heat absorbing portion 3 in FIG. It is the shape made to contact the outer periphery of the heat pipe heat absorption part 3 to the limit position.
Since other configurations are the same as those of the second embodiment, the description thereof is omitted.

The operation will be described.
[Efficient heat transfer]

A portion of the heat transfer body 9 that is brought into contact with the heat pipe heat absorbing portion 3 is formed into a bowl shape, and the stretch start portion 91 of the heat transfer body 9 is configured to be positioned at a side end portion of the bowl shape. Thereby, the area which is contacting the heat pipe of the heat transfer body 9 can be increased, and the heat transfer area for cooling the battery 2 can be increased to obtain efficient cooling performance. .
Moreover, alignment of the assembled battery case 1b and the heat pipe heat absorption part 3 becomes easy by the hook-shaped parts on both sides of the heat transfer body 9.
Furthermore, the heat transfer body 9 is less likely to be detached from the heat pipe heat absorbing portion 3 even when the vehicle travels.
Since other operations are the same as those of the second embodiment, description thereof is omitted.

Explain the effect.
The vehicle battery cooling system according to the third embodiment has the following effects in addition to the effects (1) to (4).
(5) The heat pipe heat absorption part 3 is arranged close to both side parts of the assembled battery case 1b containing the battery 2, and the heat transfer body 9 is provided so as to stretch over the heat pipe heat absorption parts 3 on both sides. In addition, both ends of the heat transfer body 9 are brought into contact with the heat pipe heat absorption part 3 at the contact surface of the bowl shape, and the boundary between the part of the heat transfer body 9 brought into contact with the heat pipe heat absorption part 3 and the part to be stretched is a bowl shape. Therefore, more efficient battery cooling performance can be obtained by increasing the contact area between the heat pipe heat absorption part 3 and the heat transfer body 9 and improving the heat transfer efficiency.
In addition, it is possible to improve the ease of operation by making the alignment good, so that it does not come off later.

The vehicle battery cooling system of the fourth embodiment is an example in which a fixture for protecting the heat transfer body 9 is provided.
The configuration will be described.
FIG. 9 is an explanatory perspective view of the battery cooling structure in the vehicle battery cooling system of the fourth embodiment. FIG. 10 is a partially enlarged explanatory view of the battery cooling structure in the vehicle battery cooling system of the fourth embodiment.

In Example 4, the heat pipe heat absorption part 3 is arrange | positioned on both sides of the assembled battery case 1b which accommodated the battery 2, and it provides so that the heat exchanger 9 may be stretched over the heat pipe heat absorption part 3 of both sides. And the part made to contact the heat pipe heat absorption part 3 of the heat exchanger 9 is made to become a perimeter.
Next, as shown in FIGS. 9 and 10, the fixture 10 that covers the portion of the heat pipe heat absorbing portion 3 to which the heat transfer body 9 is attached and the upper and lower surfaces of the assembled battery case 1 b in a substantially U shape. Provide.
The fixture 10 is provided on both sides.
Since other configurations are the same as those of the second embodiment, the description thereof is omitted.

The operation will be described.
[Function to protect heat transfer body]
In the fourth embodiment, since the fixture 10 is provided, when assembling, when holding it by a person or a machine, the fixture 10 or another assembled battery case 1b may be held. To do.

When the heat transfer body 9 is made of a material having a good thermal conductivity, such as a copper plate or a copper foil sheet, the heat transfer body 9 is easily deformed by hitting a person or an object. However, after mounting on a vehicle, it is advantageous to use a material having such a soft physical property if it is required to exhibit heat transfer properties that are higher than rigidity if conditions such as vibration are cleared. It is.
If the fixture 10 is provided and the heat transfer body 9 is protected as in the fourth embodiment, the function of the heat transfer body 9 can be sufficiently exerted without impairing workability such as assembly work.
Since other operations are the same as those of the second embodiment, description thereof is omitted.

Explain the effect.
The vehicle battery cooling system according to the fourth embodiment has the following effects in addition to the effects (1) to (5).
(6) Since the fixture 10 that protects the attachment portion of the heat transfer body 9 to the heat pipe heat absorption section 3 is provided, the heat transfer action of the heat transfer body 9 can be sufficiently exerted to efficiently cool the battery. it can.

As mentioned above, although the vehicle battery cooling system of the present invention has been described based on the first to fourth 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.
In the structure shown in FIGS. 6 and 8, the endothermic heat pipe 3 is integrally brazed to the heat transfer body 9 of the assembled battery case 1b in advance and arranged on the surface of the lower case portion of the battery case 1a, or the battery A structure may be employed in which a concave portion is formed on the surface of the lower case portion of the case 1 a and the endothermic heat pipe 3 is disposed, and then the heat transfer body 9 of the assembled battery case 1 b is covered with the endothermic heat pipe 3.

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 a description perspective view of the battery cooling structure in the battery cooling system for vehicles of Example 1. It is a description perspective view of the battery cooling structure part on the vehicle body panel in the battery cooling system of Example 1. It is a description perspective view of the battery cooling structure in the battery cooling system for vehicles of Example 2. It is a partially expanded explanatory view of the battery cooling structure in the vehicle battery cooling system of the second embodiment. It is a description perspective view of the battery cooling structure in the vehicle battery cooling system of the third embodiment. It is a partially expanded explanatory view of the battery cooling structure in the vehicle battery cooling system of the third embodiment. It is a description perspective view of the battery cooling structure in the battery cooling system for vehicles of Example 4. It is a partially expanded explanatory view of the battery cooling structure in the vehicle battery cooling system of the fourth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Battery case 1b Battery assembly case 2 Battery 3 Heat absorption heat pipe 4 Heat radiation heat pipe 41 Heat radiation part 5 Electromagnetic valve 6 Connection part 7 Connection part 8 Car body panel 9 Heat transfer body 91 (Heat transfer body) Overhang start part 10 Fixing tool

Claims (7)

A battery installed in a vehicle and used for traveling;
An endothermic path that is provided near the side of the battery and that absorbs heat by flowing a refrigerant inside;
A heat dissipation path that is provided outside the passenger compartment and that dissipates heat by flowing a refrigerant inside;
A connection path for connecting the heat absorption path and the heat radiation path so that the refrigerant can circulate;
With
The heat absorption path, the heat dissipation path, and the connection path constitute a heat pipe in which the refrigerant circulates by condensation and evaporation of the refrigerant.
A vehicle battery cooling system. The vehicle battery cooling system according to claim 1,
An electromagnetic valve for controlling the circulating refrigerant is provided in the middle of the heat pipe.
A vehicle battery cooling system. The vehicle battery cooling system according to claim 1 or 2,
Provided a heat transfer body for transferring the heat of the battery to the heat absorption path,
A vehicle battery cooling system. The vehicle battery cooling system according to claim 3,
The battery is configured by stacking a plurality of the batteries,
The heat transfer body is located in the center of the stacked battery,
A vehicle battery cooling system. The vehicle battery cooling system according to claim 3 or 4,
The heat absorption path is disposed close to both sides of the battery,
The heat transfer body is provided so as to be stretched over the heat absorption paths on both sides,
Both ends of the heat transfer body are brought into contact with the heat absorption path with a bowl-shaped contact surface, and the boundary between the portion of the heat transfer body that is in contact with the heat absorption path and the portion to be stretched is formed into the end of the bowl shape. ,
A vehicle battery cooling system. The vehicle battery cooling system according to any one of claims 3 to 5,
A fixing tool for protecting the attachment portion of the heat transfer body to the heat absorption path is provided.
A vehicle battery cooling system. The vehicle battery cooling system according to any one of claims 1 to 6,
At least the heat dissipation path of the heat pipe is provided behind the vehicle away from the engine.
A vehicle battery cooling system.

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