KR20120087406A - Battery temperature controller and control method for hybrid electric vehicle - Google Patents

Abstract

PURPOSE: An apparatus and a method for controlling temperature of a battery for hybrid vehicles are provided to improve usage efficiency of the battery by appropriately maintaining the operational temperature of the battery by cooling or heating the battery as necessary. CONSTITUTION: A rear air conditioning device(10) includes a blower(11), a heat exchanger for heating(12) and a heat exchanger for cooling(13). A battery(20) is included in vehicles to drive a motor. A battery case(30) includes the battery. An air conditioning duct(50) communicates the rear conditioning device and the battery case. A duct door(60) opens and closes the air conditioning duct.

Description

BATTERY TEMPERATURE CONTROLLER AND CONTROL METHOD FOR HYBRID ELECTRIC VEHICLE}

The present invention relates to a method for controlling an optimum temperature of a battery for a hybrid vehicle, and more particularly, to properly maintain or maintain an operating temperature of the battery by cooling or heating the battery as needed during initial use and charge / discharge of the battery installed in the hybrid vehicle. The present invention relates to an optimum temperature control apparatus and method for a hybrid vehicle battery to improve use efficiency.

Recently, as environmental issues such as global warming prevention have been highlighted, research and development on hybrid electric vehicles (HEVs) with relatively low carbon dioxide generation have been actively conducted.

The hybrid vehicle is equipped with an electric motor and an internal combustion engine for driving the vehicle. At low speeds, the vehicle is driven by an electric motor connected to the battery, and at high speeds, the vehicle is driven by the engine to charge the battery. Accordingly, the battery mounted in the hybrid vehicle repeats the charging and discharging countlessly.

However, if the battery mounted on the hybrid vehicle is repeatedly charged and discharged, the battery may easily be overheated. If the temperature of the battery is increased and overheated, the strength of electricity generated from the battery becomes unstable and the inside of the battery is damaged. As a result, battery life may be shortened, and the motor may be malfunctioned.

In addition, when the vehicle is parked and stopped for a long time outdoors during the winter season, the battery may be cooled to an extremely low temperature due to the influence of the outside temperature, and thus the vehicle may not operate normally.

Accordingly, a hybrid vehicle is generally equipped with a temperature control device for properly maintaining the temperature of the battery to prevent the battery from being overheated or cooled to an excessively high temperature to prevent normal operation.

As an example of the method of cooling the battery by the thermostat, there is a method of cooling the battery by selectively supplying either the indoor or outdoor air of the vehicle to the battery case. When the battery is overheated by charging and discharging of the heavy battery, the air is cooled by selecting a lower temperature air from indoor air and outdoor air of the vehicle and supplying the air into the battery case.

An example of a method of heating the battery by the temperature controller is to supply the indoor air of the vehicle to the battery case or to install a separate heater core while the indoor heating of the vehicle is in operation, and then to heat the heated air into the battery case. The method of supply is mentioned.

However, since the temperature of the indoor air of the vehicle is significantly different from the temperature of the air discharged from the air conditioning apparatus due to the influence of the passenger's body temperature and the outside air, there is a considerable difficulty in precisely controlling the temperature of the battery using the indoor air. .

In addition, during the initial operation of the vehicle, it takes a considerable time to raise the vehicle's indoor air to a certain temperature. When inhaling the vehicle's indoor air and heating the battery as above, the excessive time is required to heat the battery to the proper temperature. There is a problem that this takes.

Therefore, the present invention is to improve the problems of the conventional battery temperature control device as described above, the present invention is installed the air conditioning duct connecting the air conditioning device and the battery case of the hybrid vehicle through the air conditioning duct cold air of the air conditioning device Another object of the present invention is to provide an apparatus and a method for controlling the temperature of a battery efficiently and quickly by allowing warm air to be directly supplied into a battery case.

The temperature control apparatus according to the object of the present invention as described above, the front and rear air conditioning apparatus having a blower, a heat exchanger for heating, a cooling heat exchanger, a battery provided in the vehicle for driving the motor, and the battery is accommodated A battery case and an air conditioning duct for communicating the air conditioner with the battery case; A duct door for opening and closing the air conditioning duct; And a control unit for controlling the opening and closing of the duct door, and the air conditioning duct communicates with the rear air conditioning unit at the rear of the heat exchanger for the rear air conditioning unit, and the control unit is configured to directly supply the hot and cold air of the air conditioning unit into the battery case. It is achieved by opening and closing the duct door based on the battery temperature.

In addition, the temperature control method of the present invention, the front and rear air conditioning apparatus having a blower, a heat exchanger for heating, a cooling heat exchanger, a battery provided in the vehicle for driving the motor, a battery case in which the battery is accommodated, and An air conditioning duct for communicating a rear air conditioner with the battery case; A duct door for opening and closing the air conditioning duct; In the hybrid vehicle battery temperature control method comprising a control unit for controlling the opening and closing of the duct door, the control unit for sensing the temperature of the battery; Comparing the battery temperature with a set temperature; Supplying warm air to a battery using the heating heat exchanger when the battery temperature is lower than a preset temperature; When the battery temperature is higher than the set temperature is achieved by including supplying cold air to the battery using a cooling device.

The use of the present invention can sense the temperature of the battery provided in the hybrid vehicle, and maintain the temperature of the battery at a set temperature by cooling or heating the battery according to the sensed temperature.

Moreover, even if the hot and cold air is supplied to the room, it takes a considerable time for the indoor air temperature to reach the set target temperature. The present invention provides a cooling and heating heat exchanger (for example, an air conditioner, a heater core, and a PTC) in an air conditioner by means of a battery temperature controller. Etc.) and directly supply the hot and cold air discharged from the air conditioning apparatus into the battery case through the air conditioning duct, so that the temperature of the battery can be effectively maintained within the set temperature range compared to the prior art.

1 is a configuration diagram showing an example of the optimum temperature control device for a hybrid vehicle battery according to the present invention;
2 is a flowchart showing an example of a method for controlling an optimum temperature of a hybrid vehicle battery according to the present invention;
3 is a flowchart illustrating another example of a method for controlling an optimum temperature of a hybrid vehicle battery according to the present invention.

Hereinafter will be described in more detail with reference to the accompanying drawings showing an embodiment of the present invention.

The present invention is to solve the problem that the temperature of the battery is extremely high or low at the time of charging and discharging or the initial use of the battery by maintaining the battery temperature of the hybrid vehicle within the set temperature range, for this purpose, The battery temperature controller includes a rear air conditioner 10, a battery 20, a battery case 30, a controller 40, an air conditioning duct 50, and a duct door 60 as shown in FIG. 1. do.

The rear air conditioner 10 includes a blower 11, a heat exchanger 12 for heating, and a heat exchanger 13 for cooling, respectively, and the heat exchanger 12 for heating is usually a heater core or PTC (electric heater). The air conditioner (cooling device) for a vehicle is used as the cooling heat exchanger (13), and the control unit 40 which controls the cooling / heat exchanger (12, 13) of the rear air conditioner 10 mentioned later is suitably controlled, The battery 20 is heated or cooled.

A plurality of batteries 20 are provided in the hybrid vehicle to drive the electric motor while repeating charging and discharging according to the driving mode of the vehicle. In the hybrid vehicle, the batteries 20 are mainly installed in the trunk of the vehicle or under the seat. .

The battery case 30 includes a plurality of batteries 20 therein to fix the battery 20, and securely protect the battery 20 from external shock and at the same time appropriately control the temperature of the battery 20. It also functions as a duct so that the hot and cold air can be supplied to maintain it.

In addition, the battery case 30 is attached with a temperature sensor (not shown) for sensing the temperature of the battery, through which the temperature state of the battery case 30 is transmitted to the controller 40 which will be described later.

The controller 40 senses the temperature through the battery 20 temperature sensor attached to the battery case 30, and sets the temperature of the cold or warm air supplied into the battery case 30 according to the detected temperature. Accordingly, by controlling the rear air conditioner 10 and controlling the opening and closing of the duct door 60 which will be described later, the temperature of the battery 20 is maintained at the set temperature.

The air conditioning duct 50 is an air passage connecting the rear air conditioning apparatus 10 and the battery case 30 to allow cold and warm air to flow therein. When the air conditioning duct 50 has a long length, air of cold or warm air is Heat loss may occur in the process of passing through the air conditioning duct 50 into the battery case 30, and furthermore, since the air conditioning duct 50 must be formed in the vehicle, there is a problem of increasing space and installation cost. During the control of the temperature of the battery 20, it may be difficult to optimally maintain the room temperature.

Duct door 60 is a configuration for controlling the opening and closing of the air-conditioning duct 50, the duct door 60 is opened and closed controlled by the control unit 40, the cold air or heater core 12 generated through a cooling device The warm air generated by the air is supplied into the battery case 30 through the air conditioning duct 50, and the duct door 60 is provided at the inlet and the outlet of the air conditioning duct 50. By controlling the opening and closing of each of the duct doors 60 provided in the control unit, the supply amount of cold and hot air can be appropriately controlled in accordance with the detected temperature of the battery 20.

In the hybrid vehicle battery temperature control apparatus of the present invention as shown in FIG. 1, the controller 40 first detects the temperature of the battery 20, and determines whether the temperature is higher or lower than the set temperature, and accordingly, The air conditioner 10 and the duct door 60 are controlled to supply cold and hot air into the battery case 30.

The present invention is largely divided into the initial use and charge and discharge of the battery 20 is controlled, the following describes a method of controlling the temperature of the battery 20 according to the temperature of the battery 20.

<Low temperature>

The temperature of the battery 20 by first comparing the sensed temperature of the battery 20 through the control section 40, and (S100), the detected battery temperature (T _BATTERY) and set temperature (T _1), as shown in Figure 2 ( It is determined whether T _BATTERY is within the range of the set temperature T ₁ (S200). Here, the set temperature (T ₁ ) is a temperature range that can exhibit the best performance when the battery 20 is normally charged and discharged, this temperature is usually set to a temperature of 20 ~ 30 ℃.

On the other hand, if the detected battery temperature (T _BATTERY ) is within the set temperature (T ₁ ) range of the charge and discharge of the battery as it is (S310), and at the same time to allow the air conditioning device to control the passenger (S310).

On the other hand, if the detected battery temperature T _BATTERY is not within the set temperature T ₁ range, it is determined whether the temperature is higher or lower than the set temperature T ₁ (for example, if it is lower than the set temperature). (S400).

When the detected battery temperature T _BATTERY is lower than the set temperature T ₁ , the temperature of the battery 20 is set at the same time as the charging and discharging of the battery 20 is performed to improve the performance of the battery 20. ₁ ) is operated in a warm air supply mode to increase up to (S500).

In the hot air supply mode, as the charge and discharge of the battery 20 proceeds, the control unit 40 operates the blower 11 and the heat exchanger 12 for heating in the rear air conditioner 10 to create a warm air, and to the control unit 40. The duct door 60 is opened so that the warm air is supplied into the battery case 30 along the air conditioning duct 50 so that the warm air generated by the rear air conditioner 10 is directly supplied into the battery case 30, whereby the battery Heat (20) within the set temperature (T ₁ ) range.

<High temperature>

On the other hand, if the detected battery temperature (T _BATTERY ) is higher than the set temperature (T ₁ ) is operated in the cold air supply mode for operating the cooling device of the rear air conditioner 10 to cool the battery 20 (S600).

As an example of the cold air supply mode, the charging and discharging of the battery 20 proceeds first, and at the same time, the controller 40 operates a cooling device (eg, an air conditioner) of the rear air conditioning device 10, and the rear air conditioning device 10. Opening the duct door 60 in the air passage is connected so that the cold air is supplied into the battery case 30 along the air conditioning duct (50).

After operating in the hot air or cold air supply mode, the process moves to the step of detecting the temperature of the battery 20 again, and continuously compares and determines the battery temperature (T _BATTERY ) and the set temperature (T ₁ ), and selects the hot or cold air. The temperature of the battery 20 is maintained at the set temperature T ₁ .

Meanwhile, the present invention provides a cooling unit provided in the battery case 30 and a method of using the rear air conditioner 10 in the cold air supply mode in consideration of the difference between the detected battery temperature T _BATTERY and the set temperature T ₁ . For example, after entering the cold air supply mode of the battery as illustrated in FIG. 3, the detected battery temperature T _BATTERY is again compared with the threshold temperature T _{2 to} determine the battery 20. The degree of overheating is determined (S601).

If the detected battery temperature T _BATTERY is higher than the limit temperature T ₂ , the controller 40 controls the rear air conditioner 10 to rapidly cool the battery 20, while the battery temperature T _BATTERY is When the temperature is lower than the limit temperature T ₂ , the battery cooling unit is operated to cool the battery 20 (S602).

The battery cooling unit cools the battery 20 by cooling the battery 20 by supplying outside air or indoor air into the battery case 30 without controlling the rear air conditioner 10. It is a device that is usually provided to cool so as not to overheat.

As an embodiment of such a battery cooling unit of the present invention, as shown in Figure 1, the indoor air inlet duct 31 and the outside air inlet duct to which indoor air is introduced, in addition to the air conditioning duct 50 connected to the rear air conditioner 10. 32 may be further provided to supply air of a lower temperature from outside air or indoor air into the battery case 30.

In addition, the indoor air inlet duct 31 and the outdoor air inlet duct 32 are further provided with opening and closing doors in each duct so as to open and close each air passage as necessary to switch the flow path.

Even if the temperature of the battery 20 is higher than the set temperature T ₁ by such a battery cooling unit, if the battery 20 is within an appropriate temperature range that can be easily cooled by the battery cooling unit, the rear air conditioner 10 is unnecessary. ) To cool the battery 20 quickly within the set temperature (T ₁ ) by controlling only the battery cooling unit without directly controlling the battery. In order to do this more efficiently, the battery cooling unit compares the vehicle's indoor temperature with the outside air temperature, respectively. The step of selecting a lower temperature is performed (S603), and by supplying air of the lower temperature selected in this step into the battery case 30, the battery 20 can be cooled more efficiently.

Meanwhile, the controller 40 of the present invention controls the rotation speed of the blower 11 in the rear air conditioner 10 and the operating temperatures of the heating heat exchanger 12 and the cooling heat exchanger 13 according to the temperature of the battery 20. By controlling, it is possible to rapidly cool or heat the battery 20 to more accurately control the temperature of the battery.

The present invention as described above is a temperature control device and a method of repeating the cooling and heating to maintain a temperature at which the battery of the hybrid vehicle can always exhibit the optimal performance, and by controlling the air conditioning device according to the detected battery temperature By directly supplying the hot and cold air of the air conditioning apparatus into the battery case 30, the temperature of the battery can be quickly cooled and heated.

10: Rear air conditioner 11: Blower
12: heat exchanger for heating 13: heat exchanger for cooling
20: battery 30: battery case
31: Indoor air inlet duct 32: Outdoor air inlet duct
40: control unit 50: air conditioning duct
60: duct door

Claims (5)

Front and rear air conditioners (10) including a blower (11), a heat exchanger (12) for heating, and a heat exchanger (13) for cooling, a battery (20) provided in a vehicle for driving a motor, and the battery ( A battery case 30 in which 20 is accommodated, and an air conditioning duct 50 for communicating the rear air conditioner 10 and the battery case 30; A duct door (60) for opening and closing the air conditioning duct (50); It includes a control unit 40 for controlling the opening and closing of the duct door 60,
The air conditioning duct 50 communicates with the rear air conditioner 10 at the rear of the heat exchanger 12 for heating of the rear air conditioner 10,
The controller 40 controls the opening and closing of the duct door 60 based on the temperature of the battery 20 so that the cold and hot air of the rear air conditioner 10 is directly supplied into the battery case 30. Battery optimum temperature control.
The method according to claim 1,
The duct door 60 is provided at the inlet of the air conditioning duct 50 communicating with the rear air conditioning apparatus 10 and the outlet of the air conditioning duct 50 communicating with the battery case 30, respectively. Battery optimum temperature control.

Front and rear air conditioners (10) including a blower (11), a heat exchanger (12) for heating, and a heat exchanger (13) for cooling, a battery (20) provided in a vehicle for driving a motor, and the battery ( A battery case 30 in which 20 is accommodated, and an air conditioning duct 50 for communicating the rear air conditioner 10 and the battery case 30; A duct door (60) for opening and closing the air conditioning duct (50); In the hybrid vehicle battery temperature control method comprising a control unit 40 for controlling the opening and closing of the duct door 60,
The control unit 40 detects the temperature of the battery 20 (S100);
Comparing the battery temperature T _BATTERY with a set temperature T ₁ (S200 and S400);
Supplying warm air to the battery 20 using the heating heat exchanger 12 when the battery temperature T _BATTERY is lower than the set temperature T ₁ (S500);
When the battery temperature (T _BATTERY ) is higher than the set temperature (T ₁ ), characterized in that it comprises the step (S600) of supplying cold air to the battery 20 by using a cooling device and a cooling heat exchanger (13) Hybrid vehicle battery optimum temperature control method.
The method according to claim 3,
If the battery temperature T _BATTERY is higher than a set temperature T ₁ , comparing the battery 20 temperature T _BATTERY with a limit temperature T ₂ (S601);
When the battery temperature T _BATTERY is higher than the limit temperature T ₂ , the cooling air is supplied to the battery 20 using the cooling heat exchanger 13 of the rear air conditioner 10 (S600). ;
When the battery 20 temperature T _BATTERY is lower than the threshold temperature T ₂ , the method of controlling the optimum temperature of the hybrid vehicle battery, characterized in that step S602 of cooling the battery 20 with the battery cooling unit. .
The method of claim 4,
The cooling of the battery by the battery cooling unit (S602) further includes a cold air selection step (S603) of selecting air at a lower temperature from the interior air and the outside air and supplying the inside of the battery case 30. Hybrid vehicle battery optimum temperature control method.

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