KR20090055055A - Battery cooling system of hybrid electric vehicle - Google Patents

Abstract

A battery cooling system of a hybrid electric vehicle is provided to cool the battery efficiently by radiating the heat of the battery to outside through bottom air flow generated in vehicle driving. A battery cooling system of a hybrid electric vehicle comprises: a heat sink plate(21) provided with heat generated in a battery unit(10); a heat pipe module(22) provided with the heat from a heat sink pipe; and a heat radiating plate(29) installed at both ends of the heat pipe module which are downwardly curve-cut; The heat sink plate is installed along the battery unit to be contacted to the lower surface of the battery unit. The heat pipe module is installed along the heat sink plate to be contacted to the lower surface of the heat sink plate. The heat plate is installed in order to be exposed to the vehicle lower part underfloor bottom side.

Description

Battery cooling system of hybrid vehicle

The present invention relates to a battery cooling apparatus of a hybrid vehicle, and more particularly, to a cooling apparatus of a high voltage battery provided in a hybrid vehicle to provide driving power of an electric motor for driving a vehicle.

In general, a hybrid vehicle in a broad sense means driving the vehicle efficiently by combining two or more different power sources, but in most cases, a driving force by an engine and an electric motor (drive motor) using fuel such as gasoline or diesel. Means a vehicle to obtain, it is called a hybrid electric vehicle (HEV).

The hybrid electric vehicle is essentially equipped with a high-voltage battery that provides the driving power of the electric motor, the battery will supply the necessary power while repeatedly charging / discharging while driving the vehicle.

In the case of automobiles, changes in the driving environment such as area, temperature, humidity, and air pressure are very severe, and battery charging / discharging in a real environment is different from battery charging / discharging efficiency under laboratory conditions.

In general, it is known that the charge / discharge efficiency of a battery is lowered at a low temperature / high temperature, and that the charge / discharge efficiency is lowered at a high humidity environment.

Therefore, it is necessary to maintain the battery temperature in a constant temperature range capable of exhibiting optimal performance. The high voltage battery used in the hybrid vehicle has a high temperature during use, and the optimum operating temperature is room temperature.

To this end, the battery system is equipped with a battery temperature control device, which has a main purpose to cool the battery temperature rises by introducing the indoor air of the vehicle.

1 is a perspective view showing an example of a conventional battery system mounted in the luggage compartment, although not shown in the drawing, a battery pack module (battery unit) is provided inside the main duct 3 of the battery assembly 2. It is built.

Also, an inlet duct 4 connected to the vehicle air conditioning duct is provided at the inlet side of the main duct 3 for inflow of the vehicle indoor air, and an outlet for exhausting air that has passed through the inside of the main duct 3 to the outlet side. The duct 5 is installed.

The outlet duct 5 is provided with an electric fan 6 that sucks air to generate air flow in the main duct 3. The electric fan 6 is driven to draw the inlet duct 4 from the air conditioning duct inside the vehicle. The air introduced through the system passes through the system (inside the main duct) in the direction of the arrow to cool the battery pack module, and then is discharged to the outside of the vehicle through the outlet duct (5).

However, conventional battery coolers comprising a main duct (3), an inlet duct (4) and an outlet duct (5), and an electric fan (6) allow the vehicle air to be maintained in order to maintain the battery system in a certain temperature range. It is a system that lowers the temperature of the battery by flowing in and exhausts the indoor air heat exchanged with the battery through the outlet duct, and is configured to inhale the indoor air of the vehicle using an electric fan and to discharge the heat exchanged air.

However, in a hybrid vehicle where efficiency is important, driving a motor of an electric fan for cooling the battery lowers the fuel economy of the vehicle.

Therefore, the present invention has been invented to solve the above problems, the heat absorbing plate which is a heat transfer medium in contact with the battery, the heat pipe module is a heat transfer medium in contact with the heat absorbing plate, the heat dissipation medium which is installed in the heater pipe The plate is configured to externally discharge the heat of the battery to the air flow below the vehicle generated when the vehicle is driven through the heat radiating plate, thereby enabling efficient battery cooling without driving a conventional electric fan motor having high power consumption. The object is to provide a battery cooling device for a vehicle.

In order to achieve the above object, the present invention provides a cooling device for a high voltage battery mounted on a hybrid vehicle,

An endothermic plate installed along the battery unit to be in contact with the bottom surface of the battery unit to receive heat generated from the battery unit;

A heat pipe module installed along the endothermic plate to be in contact with the bottom surface of the endothermic plate to receive heat from the endothermic pipe;

Installed at both ends of the lower bent portion of the heat pipe module are installed to be exposed to the lower under floor of the vehicle, the heat transmitted through the heat pipe to discharge the flow of air passing through the vehicle body in the front and rear direction from the lower side of the vehicle during driving It characterized in that it comprises a heat radiation plate.

According to the hybrid vehicle battery cooling apparatus of the present invention as described above, an endothermic plate which is a heat transfer medium in contact with a battery, and a heat pipe that is a heat transfer medium in contact with the endothermic plate without driving a conventional electric fan motor having high power consumption. By using the heat dissipation plate that is a heat dissipation medium installed in the module and the heater pipe, heat of the battery is discharged to the outside through the vehicle air flow (running wind) generated when the vehicle is driven, thereby enabling efficient battery cooling.

In addition, if the battery cooler of the present invention is configured and used in combination with an existing battery cooler using an electric fan, it is possible to reduce the use of the electric fan mounted on the hybrid vehicle and effectively increase the fuel efficiency of the vehicle. .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The high voltage batteries used in hybrid vehicles have a high temperature during use. The optimum operating temperature of these high voltage batteries is room temperature, and battery cooling is required to maintain the optimum operating temperature.

In the existing hybrid vehicle battery cooling device, the electric fan (blower) uses the electric fan (blower) to suck up the indoor air and exhausts the heat exchanged air to the outside. Therefore, in a hybrid vehicle where efficiency is important, the electric fan motor for cooling the battery must be driven. Lowers fuel economy.

In order to solve this problem, the present invention uses a heat pipe that receives heat from the battery as a means for cooling the battery, and a heat radiating plate for dissipating heat to air (driving wind) flowing along the lower part of the vehicle when the vehicle is driven.

2 is a perspective view illustrating a battery cooling device for a hybrid vehicle according to the present invention, and FIG. 3 is a bottom perspective view showing an air flow state of the lower part of the vehicle to which the hybrid vehicle battery cooling device according to the present invention releases heat. Figure 4 is a detailed side view showing a state in which heat is discharged to the air flow passing along the lower portion of the heat radiating plate of the hybrid vehicle battery cooling apparatus according to the present invention.

In addition, Figure 5 is a diagram illustrating a heat shutoff valve and its operating state installed in the heat pipe in the hybrid vehicle battery cooling apparatus according to the present invention.

In the present invention, the heat absorbing plate 21 in contact with the battery unit 10, the heat pipe module 22 in contact with the heat absorbing plate 21, and the heat pipe as cooling means for maintaining an optimum operating temperature. It comprises a heat dissipation plate 29 for dissipating the heat transmitted from the module 22 to the lower air flow of the vehicle generated when driving the vehicle.

In FIG. 2, reference numeral 10 denotes a high voltage battery unit for a hybrid vehicle, which supplies power for driving an electric motor (driving motor) of the hybrid vehicle, and its temperature increases during use (charge / discharge).

Reference numeral 21 is an endothermic plate installed long along the longitudinal direction of the battery unit 10, is fixed to the lower surface of the battery unit 10, and is in direct contact with the battery unit 10 that discharges heat during charging / discharging It is installed so as to receive heat generated from the battery unit 10 to transfer to the heat pipe module 22.

As the endothermic plate 21, a plate made of a material having high thermal conductivity is used because it is a heat transfer medium that transfers heat from the battery unit 10. The endothermic plate 21 is brought into contact with the lower surface of the battery unit 10 and then welded, bolted, or riveted. Fix and install using a variety of known methods, such as ping.

Next, the heat pipe module 22 is composed of a plurality of heat pipes 23 arranged side by side and integrally assembled, wherein each heat pipe 23 is capable of heat transfer to the lower surface of the endothermic plate 21. Are installed in contact with each other.

In particular, each of the heat pipes 23 is installed along the longitudinal direction of the heat absorbing plate 21, wherein both ends of the longitudinal direction is formed to be bent downward, and the lower end of the body under floor (9) at each end The heat radiating plate 29 to be exposed is integrally connected and installed.

The heat pipe module 22 is a heat transfer medium that transfers heat from the heat absorbing plate 21 to the heat radiating plate 29. The heat pipe module 22 contacts the heat absorbing plate 21 for fixing, and then supports or supports the bracket by welding. Manner may be used.

Each of the heat pipes 23 is filled with a heat transfer working fluid, which serves as a substantial heat transfer medium for transferring heat transferred from the heat absorbing plate 21 to the heat radiating plate 29 in the heat pipe module 22. It becomes a working fluid filled inside the heat pipe.

In addition, the heat pipe module 22 is provided with a heat shutoff valve 24 at both end positions near the heat dissipation plate 29, and the heat shutoff valve 24 is each heat pipe 23 and a working fluid therein. As a heat shield means for selectively blocking heat transfer to the heat dissipation plates 29 at both ends of the heat pipe module, the valve illustrated in FIG. 4 may be used.

Referring to FIG. 4, each of the heat shutoff valves 24 installed at each end side of the heat pipe module 22 near each of the heat radiating plates 29 is formed so that the working fluid of the heat pipe 23 passes therethrough. The valve housing 25 which has the flow path 25a and which the heat pipe 23 is inserted in the both ends of the said internal flow path 25a, and is connected to the inside of the said valve housing 25 by the return spring 26 of the back side. The permanent magnet valve body 27 which is installed elastically supported and moves back and forth and selectively opens and closes the internal flow path 25a of the valve housing 25, and when magnetized by an electric current applied from the outside, It comprises a electromagnet 28 for pushing the back 27 to the position to open the inner passage 25a by pushing the repulsive force.

Here, the return spring 26 is a spring member that provides a restoring force for returning the permanent magnet valve body 27, which has been moved backward by repulsion when the magnetization of the electromagnet 28 is magnetized, forward.

The thermal shutoff valve 24 may be a normal closed valve, in which the permanent magnet valve body 27 is positioned toward the electromagnet 28 by the force of the return spring 26 when the current of the electromagnet 28 is released. However, the inner passage 25a of the valve housing 25 is closed, but when a current is applied to the electromagnet 28, the permanent magnet valve body is pushed by repulsive force pushing the same poles of the electromagnet 28 and the permanent magnet valve body 27 together. Reference numeral 27 moves backward while compressing the return spring 26.

A plurality of side by side heat pipes 23 installed on the bottom surface of the heat absorbing plate 21 at the position where the heat blocking valve 24 is installed are connected to one end of the inner flow passage 25a of the valve housing 25, and the inner flow passage 25a is provided. Heat pipes 23 connected to the other end of the heat dissipation plate 29 are connected to each other, and the internal flow path of the heat pipe 23 at the time of opening of the heat shutoff valve 24 is internal flow path 25a of the valve housing 25. Is communicated through the endothermic plate 21 and the heat dissipation plate 29 is connected to the structure.

The permanent magnet valve body 27 and the electromagnet 28 are located on opposite sides of the inside of the valve housing 25, and when the electromagnet 28 is magnetized by an external current, the permanent magnet valve body 27 and the electromagnet 28 are interposed with the permanent magnet valve body 27. By the repulsive force generated, the permanent magnet valve body 27 moves while compressing the return spring 26 at the rear to open the internal passage 25a of the valve housing 25 (the state becomes (a) in FIG. 5). When the external current application and the electromagnetization state are released, the permanent magnet valve body 27 is pushed forward by the elastic restoring force of the return spring 26 to close the internal passage 25a of the valve housing 25 ( (B) the state of FIG. 5).

In the state in which the heat shutoff valve 24 is opened, when the heat of the battery is transferred to the working fluid of the heat pipe module 22 through the heat absorbing plate 21, the heated working fluid is evaporated to radiate the heat plate 29. The heat of the heat pipe 23 is dissipated out through the heat dissipation plate 29 at the same time the working fluid is condensed.

The reason why the heat isolation valve 24 is installed in the heat pipe module 22 as described above is that the heat pipe is simply connected to the battery to maintain the temperature of the battery by the vehicle external conditions (high or low temperature). Because of difficulty.

That is, a heat cutoff valve 24 serving as a hydraulic oil control device is installed in the heat pipe module 22 between the heat absorbing plate 21 and the heat dissipating plate 29, and the outside of the winter through the heat blocking valve 24. If the temperature is extremely low, it will shut off the fluid flow in the heat pipe before the battery is overcooled to prevent further cooling.

The electromagnet 28 of the thermal shutoff valve 24 is provided to receive a current from the controller 20, wherein the controller 20 is based on the signal of the outdoor temperature sensor 18 or the signal of the manual operation switch 19. It may be provided to selectively apply / release the current to the electromagnet 28 of the thermal shutoff valve 24.

For example, the controller 20 is connected to receive a signal of the outdoor temperature sensor 18 for detecting the vehicle outdoor temperature, and the controller 20 receives a low temperature condition below the set temperature from the signal of the outdoor temperature sensor 18. When it is determined that the current applied to the electromagnet 28 is released to shut off the thermal shut-off valve 24.

Here, the outdoor temperature sensor 18 may be an outdoor temperature sensor 18 mounted on the vehicle, or an outdoor temperature sensor 18 separately installed on the lower side of the vehicle, that is, under the vehicle body floor.

Alternatively, the hand control switch 19 is installed at a position that can be manually operated by the driver of the driver's seat, and the controller 20 switches the hand operation switch 19 when the driver turns the hand operation switch 19 ON. By connecting the on operation signal of the, the controller 20 is configured to release the current applied to the electromagnet 28 of the thermal shut-off valve 24 by the on operation of the manual operation switch (19).

As such, when the vehicle outdoor temperature condition is excessively low temperature, the cooling fluid flow of the heat pipe 23 is blocked before the battery is overcooled, thereby preventing further cooling.

Next, the heat dissipation plate 29 has a structure in which a plurality of heat dissipation plates 29a are horizontally installed at predetermined intervals at both ends of the heat pipe 23, as shown in FIG. 22) and releases the heat received from the air flow in the lower part of the vehicle generated when driving the vehicle.

To this end, all of the heat dissipation plates 29 installed at both ends of the heat pipe module 22 are exposed to the lower side of the underfloor 9 of the vehicle, and a material having high thermal conductivity is used as the material of the heat dissipation plate 29. do.

As such, the heat exchange of the heat dissipation plate 29 is performed on the air flow in the lower part of the vehicle generated when the vehicle is driven, thereby allowing battery cooling to be more efficiently performed when the vehicle is driven.

As a result, as shown in FIG. 3, when the vehicle runs, a flow of air passing in the front and rear directions of the vehicle body occurs in the lower portion of the vehicle, and the heat radiating plate 29 where the final heat release is made is exposed to the flow of air. In this case, the heat is continuously released from the heat dissipation plate 29 by the flow of air (driving wind) generated when the vehicle runs, thereby cooling the battery.

The path through which heat is transferred and released during cooling of the battery is the battery unit 10 → the endothermic plate 21 → the heat pipe module (operating fluid) 22 → the heat dissipation plate 29 → the running wind under the vehicle.

In this manner, the battery temperature rises while the vehicle is running, but the temperature of the battery can be maintained at an appropriate temperature by heat exchange in the lower part of the vehicle.

In particular, in the present invention, the heat absorbing plate 21, which is a heat transfer medium in contact with the battery, and the heat pipe module 22, which is a heat transfer medium in contact with the heat absorbing plate 21, without driving a conventional electric fan motor having high power consumption. By using the heat dissipation plate 29, which is a heat dissipation medium installed in the heater pipe, the heat of the battery is discharged to the outside through the vehicle air flow (running wind) generated when the vehicle is driven, thereby enabling efficient battery cooling.

In addition, if the battery cooler of the present invention is configured and used in combination with an existing battery cooler using an electric fan, it is possible to reduce the use of the electric fan mounted on the hybrid vehicle and effectively increase the fuel efficiency of the vehicle. .

1 is a perspective view showing an example of a conventional battery system mounted in the luggage compartment;

2 is a perspective view showing a battery cooling device for a hybrid vehicle according to the present invention;

3 is a bottom perspective view illustrating an air flow state of a lower part of a vehicle in which a battery cooling device for a hybrid vehicle according to the present invention emits heat;

Figure 4 is a side detailed view showing a state in which heat is discharged to the air flow passing along the lower portion of the vehicle heat dissipation plate of the hybrid vehicle battery cooling apparatus according to the present invention,

5 is a diagram illustrating a heat shutoff valve installed in a heat pipe and an operating state in a battery cooling device for a hybrid vehicle according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: battery unit 21: endothermic plate

22: heat pipe module 29: heat dissipation plate

Claims (6)

In the cooling device of a high voltage battery mounted in a hybrid vehicle, An endothermic plate 21 installed along the battery unit 10 to be in contact with the bottom surface of the battery unit 10 to receive heat generated from the battery unit 10; A heat pipe module 22 installed along the endothermic plate 21 to be in contact with the bottom surface of the endothermic plate 21 to receive heat from the endothermic pipe; Installed at both ends bent downward of the heat pipe module 22 so as to be exposed to the lower under floor 9 of the vehicle, and the heat transmitted through the heat pipe 23 to the vehicle body in the front and rear direction from the lower side of the vehicle when driving the vehicle. The battery cooling device of the hybrid vehicle, characterized in that it comprises a heat radiation plate 29 for emitting to the flow of air passing through. The method according to claim 1, The heat dissipation plate (29) is a battery cooling device of a hybrid vehicle, characterized in that the plurality of heat dissipation plates (29a) are horizontally installed at both ends of the heat pipe module (22) at vertical intervals. The method according to claim 1, The heat pipe module 22 is installed to be in contact with the lower surface of the heat absorbing plate 21, respectively, the heat transfer working fluid is filled in each of the side by side heat pipe 23, the heat dissipation plate 29 is installed on both ends Battery cooling device of a hybrid vehicle, characterized in that consisting of. The method according to claim 1, The heat shutoff valve 24 installed at both end portions of the heat pipe module 22 near the heat dissipation plate 29 to selectively block heat transfer from the heat pipe module 22 to the heat dissipation plate 29. Wow; And a controller (20) for controlling the driving of the thermal shutoff valve (24). The method according to claim 4, The controller 20 is connected to receive a signal of the outdoor temperature sensor 18 for detecting the vehicle outdoor temperature, and when the low temperature condition below the set temperature is determined from the signal of the outdoor temperature sensor 18, the heat pipe module The battery cooling device of the hybrid vehicle, characterized in that the heat-retaining valve 24 is maintained in a closed state so that heat transfer from the 22 to the heat dissipation plate 29 can be blocked. The method according to claim 4 or 5, The thermal shutoff valve 24, A valve housing 25 having an inner flow passage 25a formed to allow a working fluid in the heat pipe 23 of the heat pipe module 22 to pass through and fitted with heat pipes 23 fitted to both ends of the inner flow passage 25a. and; A permanent magnet valve body that is elastically supported by a return spring 26 at the rear of the valve housing 25 and selectively opens and closes the internal flow path 25a of the valve housing 25 as it moves forward and backward. 27); When the magnetized by the current applied from the controller 20 is configured to include an electromagnet 28 for pushing the permanent magnet valve body 27 by the repulsive force to move back to the position to open the internal flow path (25a) and , When the controller 20 releases the current applied to the electromagnet 28, the permanent magnet valve body 27 maintains the closed state by the force of the return spring 26, characterized in that the battery cooling device of the hybrid vehicle .

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