CN112467254B - High-voltage battery heating system and method - Google Patents

Abstract

The invention discloses a high-voltage battery heating system and a method, and belongs to the technical field of hybrid vehicles, wherein the system comprises a hybrid controller, a heat exchanger, a PTC heater and a high-voltage battery; the hybrid controller obtains the initial temperature of the high-voltage battery, and when the initial temperature is lower than a first preset temperature, the heat exchanger and the PTC heater are used for heating the high-voltage battery through the battery heating water path. In the prior art, the high-voltage battery is heated in a single heating mode, the high-voltage battery heating system acquires the initial temperature of the high-voltage battery through the hybrid controller, and heats the high-voltage battery through two heating modes of heating by the heat exchanger and heating by the PTC heater when the initial temperature is lower than a first preset temperature, so that the high-voltage battery is rapidly heated.

Description

High-voltage battery heating system and method

Technical Field

The invention relates to the technical field of hybrid vehicles, in particular to a high-voltage battery heating system and method.

Background

With the adoption of the hybrid vehicle type as an intermediate product between the traditional fuel vehicle type and the pure electric vehicle type, the hybrid vehicle type can provide larger endurance mileage without endurance anxiety problem of the pure electric vehicle type, can realize larger energy-saving performance, and is a development direction in a period of time in the future. The high-voltage battery of the hybrid vehicle type has small electric quantity, the power required by the vehicle type driving motor is provided through large discharge rate, the discharge power of the battery is sensitive to the temperature, the discharge power of the battery is sharply reduced at low temperature, and the discharge power can be reduced to be less than 10% of the maximum dischargeable power at minus 30 ℃. In a hybrid vehicle type series mode, the engine works to drive the generator to generate electricity and then drive the motor to work, and when the dischargeable power of the battery is seriously reduced, the power of the driving motor can be limited before the temperature of the battery is restored to an appropriate temperature, so that the vehicle type performance is influenced. In China, the temperature difference between the north and the south is large in winter, so that the vehicle type suitable for China needs to be developed, a high-voltage battery heating loop needs to be added, and the electric heating is expected to reach the proper temperature in a short time.

In the prior art, a PTC heater is used alone to heat the battery, or condensed water of an engine is used alone to heat the battery. When the PTC heater is independently adopted for heating, the energy for heating the PTC heater by the battery comes from the battery, and the electric quantity of the battery of the hybrid vehicle type is small, and the engine needs to be started for power generation. After the engine is started, because the charging power of the battery is limited, the power of the generator is limited, so that the engine works in a low-efficiency area, the load of the engine is low, the fuel consumption is high, and the heating time of the high-voltage battery is long. The condensed water of the engine is independently adopted to heat the battery, and the engine is started only for heating cooling water, so that power waste is caused. Meanwhile, the cab also has the requirement of air conditioning heating, so that the heating time of the high-voltage battery is long.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a high-voltage battery heating system and a high-voltage battery heating method, and aims to solve the technical problem that the high-voltage battery heating speed is too low due to the adoption of a single high-voltage battery heating mode in the prior art.

To achieve the above object, the present invention provides a high voltage battery heating system, comprising: a mixing controller, a heat exchanger, a PTC heater and a high-voltage battery;

the mixing controller is respectively electrically connected with the heat exchanger, the PTC heater and the high-voltage battery, and the high-voltage battery is connected with the heat exchanger and the PTC heater through a battery heating water path;

the hybrid controller is used for acquiring the initial temperature of the high-voltage battery;

and the mixing controller is also used for heating the high-voltage battery by utilizing the heat exchanger and the PTC heater through the battery heating water path when the initial temperature is lower than a first preset temperature.

Preferably, the hybrid controller is further configured to control the engine to heat condensed water in a water path of the engine when the initial temperature is lower than a first preset temperature, and transfer heat of the heated condensed water to the high-voltage battery through the heat exchanger, so as to heat the high-voltage battery;

the mixing controller is also used for controlling the PTC heater to generate heat so as to heat the high-voltage battery.

Preferably, the mixing controller is further configured to obtain an inlet temperature and an outlet temperature of the battery heating water circuit at the high-voltage battery;

the mixing controller is further used for determining the change temperature of the battery heating water path according to the inlet temperature and the outlet temperature;

the mixing controller is further used for adjusting heat exchange parameters of the heat exchanger and heating parameters of the PTC heater according to the change temperature so that the battery heating water path is in a target heating temperature range.

Preferably, the hybrid controller is further configured to obtain a current temperature of the high-voltage battery;

the hybrid controller is also used for heating the high-voltage battery through the battery heating waterway by using the heat exchanger when the current temperature is higher than the first preset temperature and lower than a second preset temperature;

and the mixing controller is further used for controlling the heat exchanger and the PTC heater to stop heating the high-voltage battery when the current temperature is higher than the second preset temperature.

Preferably, the mixing controller is further configured to obtain heating power when the heat exchanger heats the high-voltage battery;

the mixing controller is also used for comparing the heating power with a preset heating power;

and the mixing controller is also used for compensating the heating power through the PTC heater when the heating power is less than the preset heating power, so that the compensated heating power is not less than the preset heating power.

In addition, in order to achieve the above object, the present invention further provides a high voltage battery heating method, including:

the hybrid controller acquires an initial temperature of the high-voltage battery;

and when the initial temperature is lower than a first preset temperature, the hybrid controller heats the high-voltage battery through the battery heating water path by using the heat exchanger and the PTC heater.

Preferably, when the initial temperature is lower than a first preset temperature, the step of heating the high-voltage battery by the hybrid controller through the battery heating water path by using the heat exchanger and the PTC heater comprises:

when the initial temperature is lower than a first preset temperature, the hybrid controller controls the engine to heat condensed water in an engine water path, and heat of the heated condensed water is transferred to the high-voltage battery through the heat exchanger, so that the high-voltage battery is heated;

the mixing controller controls the PTC heater to generate heat so as to heat the high-voltage battery.

Preferably, after the step of heating the high voltage battery by using the heat exchanger and the PTC heater through the battery heating water path when the initial temperature is lower than a first preset temperature, the hybrid controller further comprises:

the mixing controller acquires the inlet temperature and the outlet temperature of the battery heating waterway at the high-voltage battery;

the mixing controller determines the change temperature of the battery heating water path according to the temperature at the inlet and the temperature at the outlet;

and the mixing controller adjusts the heat exchange parameters of the heat exchanger and the heating parameters of the PTC heater according to the change temperature so as to enable the battery heating water path to be in a target heating temperature range.

Preferably, after the step of adjusting the heat exchange parameter of the heat exchanger and the heating parameter of the PTC heater according to the changing temperature so that the battery heating water circuit is in the target heating temperature range, the mixing controller further includes:

the hybrid controller acquires the current temperature of the high-voltage battery;

when the current temperature is higher than the first preset temperature and lower than a second preset temperature, the mixing controller heats the high-voltage battery through the battery heating waterway by using the heat exchanger;

and when the current temperature is higher than the second preset temperature, the mixing controller controls the heat exchanger and the PTC heater to stop heating the high-voltage battery.

Preferably, after the step of heating the high voltage battery by using the heat exchanger through the battery heating waterway when the current temperature is greater than the first preset temperature and less than a second preset temperature, the hybrid controller further includes:

the mixing controller obtains the heating power of the heat exchanger when heating the high-voltage battery;

the mixing controller compares the heating power with a preset heating power;

and when the heating power is smaller than the preset heating power, the mixing controller compensates the heating power through the PTC heater, so that the compensated heating power is not smaller than the preset heating power.

The invention discloses a high-voltage battery heating system and a method, wherein the system comprises a mixing controller, a heat exchanger, a PTC heater and a high-voltage battery; the hybrid controller obtains the initial temperature of the high-voltage battery, and when the initial temperature is lower than a first preset temperature, the heat exchanger and the PTC heater are used for heating the high-voltage battery through the battery heating water path. In the prior art, the high-voltage battery is heated in a single heating mode, the high-voltage battery heating system acquires the initial temperature of the high-voltage battery through the hybrid controller, and when the initial temperature is lower than a first preset temperature, the high-voltage battery is heated through two heating modes of heating by the heat exchanger and heating by the PTC heater, so that the high-voltage battery is rapidly heated.

Drawings

Fig. 1 is a block diagram showing the structure of a first embodiment of a high-voltage battery heating system according to the present invention;

fig. 2 is a block diagram showing the structure of a second embodiment of the high-voltage battery heating system according to the present invention;

fig. 3 is a schematic flow chart of a first embodiment of a high-voltage battery heating method according to the invention;

fig. 4 is a schematic flow chart of a second embodiment of the high-voltage battery heating method according to the invention;

fig. 5 is a schematic flow chart of a high-voltage battery heating method according to a third embodiment of the invention.

The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a block diagram illustrating a first embodiment of a high voltage battery heating system according to an embodiment of the present invention.

As shown in fig. 1, the high voltage battery heating system may include: a hybrid controller 1001, a heat exchanger 1002, a PTC heater 1003, and a high voltage battery 1004.

Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the high voltage battery heating system and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

Referring to fig. 1, fig. 1 is a block diagram illustrating a first embodiment of a high-voltage battery heating system according to the present invention, wherein solid line connections are electrical connections, and dotted line connections are heating water paths.

In this embodiment, the high voltage battery heating system includes a hybrid controller 1001, a heat exchanger 1002, a PTC heater 1003, and a high voltage battery 1004;

the hybrid controller 1001 is electrically connected to the heat exchanger 1002, the PTC heater 1003, and the high-voltage battery 1004 is connected to the heat exchanger 1002 and the PTC heater 1003 via a battery heating water path.

In this embodiment, the hybrid controller 1001 is configured to obtain an initial temperature of the high voltage battery 1004.

It should be understood that the hybrid controller 1001 may be a controller that controls the hybrid electric vehicle to perform normal driving. The high-voltage battery 1004 is a battery for driving the motor to power the hybrid vehicle. The high voltage battery 1004 outputs power similar to that of a normal battery when affected by temperature. At lower temperatures, the output power of the battery is lower. The initial temperature of the high-voltage battery 1004 refers to the temperature of the high-voltage battery 1004 before the hybrid vehicle is started.

In a specific implementation, the hybrid controller 1001 may acquire the initial temperature of the high-voltage battery 1004 by collecting the initial temperature of the hybrid vehicle before starting the hybrid vehicle through a temperature sensor, may also acquire the initial temperature of the high-voltage battery 1004 by calculating according to the current air temperature condition, and may also acquire the initial temperature of the high-voltage battery 1004 by calling a pre-stored temperature data, which is not limited herein.

In this embodiment, the hybrid controller 1001 is further configured to heat the high voltage battery 1004 through the battery heating water path by using the heat exchanger 1002 and the PTC heater 1003 when the initial temperature is lower than a first preset temperature.

The first preset temperature is a temperature that is set in advance to represent the initial state of the high-voltage battery 1004 of the hybrid vehicle. In the embodiment, the first preset temperature is lower than the normal working temperature of the hybrid electric vehicle. The heat exchanger 1002 may be an energy conversion device that performs energy conversion between the engine condensate and the generator condensate. In this embodiment, the energy of the engine condensate is converted to the generator condensate using heat exchanger 1002. The PTC heater 1003 is a heater composed of a PTC ceramic heating element and an aluminum pipe. The PTC heater 1003 has the advantages of low thermal resistance and high heat exchange efficiency, and is an automatic constant temperature and power-saving electric heater. The PTC heater 1003 has high safety performance, and the phenomenon of 'red' on the surface of an electric heating tube heater can not be generated under any application condition, so that potential safety hazards such as scalding and fire disasters can be caused. The battery heating water path is a water path for heating the battery, and the battery heating water path obtains energy from other positions and then transmits the energy of the battery heating water path to the high-voltage battery 1004 according to the energy difference, so that the high-voltage battery 1004 is heated. The other positions are devices for supplying energy to the waterway, such as PTC heaters, heat exchangers and the like.

In a specific implementation, after the initial temperature of the high-voltage battery 1004 is obtained, the state of the high-voltage battery 1004 needs to be confirmed according to the initial temperature of the high-voltage battery 1004, and when the initial temperature of the high-voltage battery 1004 is lower than a first preset temperature, the high-voltage battery 1004 can be determined to be in a low output state. When the high-voltage battery 1004 is in a low-output state, the heat exchanger 1002 is used for energy conversion between the engine condensate water and the generator condensate water, the PTC heater 1003 is used for heating the generator condensate water, and the energy of the generator condensate water is transmitted to the high-voltage battery 1004 through the battery heating water path, so that the high-voltage battery 1004 is heated.

The embodiment discloses a high-voltage battery heating system, which comprises a hybrid controller 1001, a heat exchanger 1002, a PTC heater 1003 and a high-voltage battery 1004; the hybrid controller 1001 acquires an initial temperature of the high-voltage battery, and heats the high-voltage battery 1004 through a battery heating water path using the heat exchanger 1002 and the PTC heater 1003 when the initial temperature is lower than a first preset temperature. In the prior art, the high-voltage battery is heated by a single heating mode, the initial temperature of the high-voltage battery 1004 is acquired by the hybrid controller 1001 of the high-voltage battery heating system of the embodiment, and when the initial temperature is lower than a first preset temperature, the high-voltage battery is heated by two heating modes of heating through the heat exchanger 1002 and the PTC heater 1003, so that the high-voltage battery is rapidly heated.

Referring to fig. 2, fig. 2 is a block diagram of a second embodiment of the high-voltage battery heating system according to the present invention, and the second embodiment of the high-voltage battery heating system according to the present invention is provided based on the first embodiment of the present invention, wherein solid line connections are electrical connections, and dotted line connections are heating water paths.

In a second embodiment, the high voltage battery heating system further comprises: an engine 1005, a shutoff valve 1006 and a high voltage distribution box 1007.

The hybrid controller 1001 is connected to the high-voltage battery 1004, the engine 1005, the stop valve 1006 and the high-voltage distribution box 1007, and the heat exchanger 1002 and the engine 1005 are connected to the stop valve 1006. The high voltage distribution box 1007 is connected with the PTC heater 1003, and the high voltage battery 1004 is connected with the heat exchanger 1002 and the PTC heater 1003.

The hybrid controller 1001 is further configured to control the engine 1005 to heat the condensed water in the engine water path when the initial temperature is lower than a first preset temperature, and transfer heat of the heated condensed water to the high-voltage battery 1004 through the heat exchanger 1002 to heat the high-voltage battery 1004.

The engine condensed water may be heated by engine heat dissipation inside the engine 1005. The stop valve 1006 is a valve for controlling the flow of the condensed water inside the engine. The high-voltage distribution box 1007 is a high-voltage high-current distribution unit PDU of all pure electric vehicles and plug-in hybrid vehicles. The high-voltage distribution box 1007 adopts a centralized distribution scheme, and has the advantages of compact structural design, convenient wiring layout and convenient and fast maintenance. According to the system architecture requirements of different customers, the high-voltage distribution box 1007 is further integrated with a part of intelligent control management units of a battery management system, so that the complexity of power distribution of the whole vehicle system architecture is further simplified. In the embodiment, the control of the PTC heater 1003 is achieved by the high voltage distribution box 1007.

In a specific implementation, the hybrid controller 1001 may command the engine 1005 to heat the condensed water inside the engine. After the heating of the condensed water inside the engine is completed, the stop valve 1006 is controlled to be opened to allow the engine condensed water to flow. When the engine condensed water flows, the heat exchanger 1002 is controlled to obtain energy of the engine condensed water, the energy is transferred to the generator condensed water, and the energy is transferred to the high-voltage battery 1004 through the battery heating water path, so that the high-voltage battery 1004 is heated.

The hybrid controller 1001 is further configured to control the PTC heater 1003 to generate heat, so as to heat the high voltage battery 1004.

It should be noted that, in the specific implementation process, the hybrid controller 1001 may control the PTC heater 1003 to generate heat through the high-voltage distribution box 1007, or may control the PTC heater 1003 to generate heat through a command manner, so as to heat the generator condensed water, and transmit the energy of the generator condensed water to the high-voltage battery 1004 through the battery heating water path.

In a specific implementation, the hybrid controller 1001 may control the high voltage distribution box 1007 to generate a corresponding high level signal or a high level signal in a command manner to control the PTC heater 1003 to start to operate to generate heat. The generator condensed water receives heat generated by the PTC heater 1003, and transfers the energy of the generator condensed water to the high-voltage battery 1004 through the battery heating water path.

The hybrid controller 1001 is further configured to obtain an inlet temperature and an outlet temperature of the battery heating water path at the high-voltage battery 1004.

Note that the inlet temperature at the high-voltage battery 1004 may be a temperature at which the condensed water in the battery heating water path is just in contact with the high-voltage battery 1004, and the outlet temperature may be a temperature at which the battery heating water path is just away from the heating battery. For example, the temperature at which the high-voltage battery 1004 starts to be heated may be set as the inlet temperature when the condensed water in the battery heating water path is heated. After the high-voltage battery 1004 is heated, the temperature at which the condensed water in the battery heating water path is not heated again can be used as the outlet temperature.

In a specific implementation, the mixing controller 1001 may obtain the inlet temperature and the outlet temperature of the battery heating water path at the high voltage battery 1004 by means of temperature sensor acquisition. In the specific implementation process, temperature sensors need to be installed at two ends of the high-voltage battery 1004 in advance, the hybrid controller 1001 sends a temperature acquisition instruction, and the temperature sensors feed back current temperature information when receiving the temperature acquisition instruction.

The hybrid controller 1001 is further configured to determine a change temperature of the battery heating water path according to the inlet temperature and the outlet temperature.

The temperature change of the battery heating water path means a temperature change of the condensed water in the battery heating water path after the high-voltage battery 1004 is heated, that is, a temperature change of the condensed water in the battery heating circuit due to energy absorbed by the high-voltage battery 1004 during heating.

In a specific implementation, the hybrid controller 1001 may obtain the temperature change by calculation when obtaining the inlet temperature and the outlet temperature of the battery heating water path at the high voltage battery 1004. For example, if the inlet temperature of the battery heating water path at the high-voltage battery 1004 is 40 degrees celsius and the inlet temperature of the battery heating water path at the high-voltage battery 1004 is 37 degrees celsius, the temperature change of the condensed water is 3 degrees celsius.

The hybrid controller 1001 is further configured to adjust heat exchange parameters of the heat exchanger 1002 and heating parameters of the PTC heater 1003 according to the change temperature, so that the battery heating water path is within a target heating temperature range.

It should be noted that the heat exchange parameter refers to an efficiency parameter of the heat exchanger 1002 for performing heat exchange work, and in an embodiment, the heat exchange parameter of the heat exchanger 1002 can be adjusted by the time when the stop valve 1006 is opened. The heating parameter refers to the power of the PTC heater 1003 for heating the battery heating water channel condensed water. The target heating temperature range is a heating temperature range in which the energy absorption efficiency of the high-voltage battery 1004 with respect to the condensed water in the battery heating water path is highest when the high-voltage battery 1004 is heated.

In specific implementation, the heat exchange parameters of the heat exchanger 1002 are adjusted by controlling the time of turning on the valve according to the value of the change temperature, and the heating parameters of the PTC heater 1003 are adjusted by using the high-voltage distribution box 1007 in an instruction mode, so that the battery heating water path is in a target heating temperature range. For example, when the change temperature is 0.5 degrees centigrade, the energy absorption efficiency of the high-voltage battery 1004 on the condensed water in the battery heating water channel is low, and the temperature of the condensed water in the battery heating water channel can be increased by increasing the temperature of the condensed water in the battery heating water channel and increasing the heating power of the PTC heater 1003 in advance, so that the energy absorption efficiency of the high-voltage battery 1004 on the condensed water in the battery heating water channel is increased, and the heating efficiency of the high-voltage battery 1004 is further improved. When the variation temperature is 5 ℃, the high-voltage battery 1004 has high absorption efficiency on the condensed water in the battery heating water path, and the battery heating water path can be in a target heating temperature range by delaying the opening of the cutoff valve and reducing the heating power of the PTC heater 1003, so that resource waste is avoided.

The hybrid controller 1001 is further configured to obtain a current temperature of the high voltage battery 1004.

It should be noted that the current temperature of the high-voltage battery 1004 is a temperature of the high-voltage battery 1004 collected in real time during the heating process. In a specific implementation process, the current temperature of the high voltage battery 1004 may be acquired in a real-time acquisition manner by a temperature sensor.

The hybrid controller 1001 is further configured to heat the high voltage battery 1004 through the battery heating waterway by using the heat exchanger 1002 when the current temperature is greater than the first preset temperature and less than a second preset temperature.

The second preset temperature is a temperature that is preset to determine whether the high-voltage battery 1004 needs to be continuously heated. When the high voltage battery 1004 is heated for a certain period of time to reach a certain temperature range, the efficiency of the high voltage battery 1004 for absorbing heat reaches the maximum value, and the heat exchanger 1002 and the PTC heater 1003 are still used for heating at the same time, which causes unnecessary waste of resources.

In a specific implementation, when the current temperature is greater than the first preset temperature and less than the second preset temperature, the hybrid controller 1001 may implement the heating stop of the PTC heater 1003 by controlling the high voltage distribution box 1007 to generate the voltage signal for stopping heating. The heat exchanger 1002 is independently adopted to heat the high-voltage battery 1004, so that the engine heat dissipation is effectively utilized to heat the high-voltage battery 1004, and the effective utilization of resources is realized.

The hybrid controller 1001 is further configured to control the heat exchanger 1002 and the PTC heater 1003 to stop heating the high-voltage battery 1004 when the current temperature is greater than the second preset temperature.

It should be noted that when the current temperature is higher than the second preset temperature, and the high voltage battery 1004 has completed the heating process, the heat exchanger 1002 and the PTC heater 1003 need to be turned off to stop heating the high voltage battery 1004. In a specific implementation, the hybrid controller 1001 may stop heating the high voltage battery 1004 by controlling the stop valve 1006 and the high voltage distribution box 1007.

The hybrid controller 1001 is further configured to obtain heating power when the heat exchanger 1002 heats the high voltage battery 1004.

The heating power is the power of the heat exchanger 1002 when the heat exchanger 1002 alone heats the high-voltage battery 1004. When the heater is used alone to heat the high-voltage battery 1004, it is necessary to obtain heating power when the heat exchanger 1002 heats the high-voltage battery 1004. In a specific implementation process, the heating power of the heat exchanger 1002 can be obtained through a series of physical calculation methods by obtaining the operating parameters of the heat exchanger 1002.

The mixing controller 1001 is further configured to compare the heating power with a preset heating power.

Note that the preset heating power may be the heating power required by the high-voltage battery 1004. During the heating process of the high-voltage battery 1004, the preset heating power condition needs to be satisfied to ensure the timeliness of the heating of the high-voltage battery 1004. For example, in a low-temperature environment, when the high-voltage battery 1004 is heated, the interior of the vehicle also has a heating requirement, and when the vehicle air conditioner is turned on, the heating power of the heat exchanger 1002 may not meet the preset heating power.

The hybrid controller 1001 is further configured to compensate the heating power through the PTC heater 1003 when the heating power is smaller than the preset heating power, so that the compensated heating power is not smaller than the preset heating power.

It should be noted that, when the heating power cannot meet the preset power, the PTC heater 1003 may be turned on, and the PTC heater 1003 is used to compensate the heating power, so that the compensated heating power can meet the preset highway requirement. In a specific implementation process, when it is determined that the heating power cannot meet the preset power, the PTC heater 1003 can be heated through the high-voltage distribution box 1007, and then the heating power is compensated.

The present embodiment discloses a high voltage battery heating system, which includes a hybrid controller 1001, a heat exchanger 1002, a PTC heater 1003, and a high voltage battery 1004; the hybrid controller 1001 acquires an initial temperature of the high-voltage battery, and heats the high-voltage battery 1004 through a battery heating water path using the heat exchanger 1002 and the PTC heater 1003 when the initial temperature is lower than a first preset temperature. Heating high-voltage battery through single heating method among the prior art, this embodiment high-voltage battery heating system acquires high-voltage battery 1004's initial temperature through hybrid control 1001 to when initial temperature is less than first preset temperature, heat high-voltage battery through two kinds of heating methods of heat exchanger heating and PTC heater heating, realized high-voltage battery's rapid heating.

Based on the above high-voltage battery heating system, the present invention further provides a high-voltage battery heating method, and referring to fig. 3, fig. 3 is a schematic flow diagram of a first embodiment of the high-voltage battery heating method of the present invention.

In this embodiment, the method for heating the high voltage battery includes the following steps:

step S10: the hybrid controller acquires an initial temperature of the high-voltage battery.

It should be noted that the hybrid controller may be a controller that controls the hybrid electric vehicle to perform normal driving. The high-voltage battery is a battery for driving the motor to power the hybrid vehicle. The high-voltage battery and a normal battery output power similar to each other under the influence of temperature. At lower temperatures, the output power of the battery is lower. The initial temperature of the high-voltage battery refers to the temperature of the high-voltage battery before the hybrid vehicle is started.

In specific implementation, the hybrid controller may acquire the initial temperature of the high-voltage battery by collecting the initial temperature before the hybrid vehicle is started through the temperature sensor, may also acquire the initial temperature of the high-voltage battery by calculating according to the current air temperature condition, and may also acquire the initial temperature of the high-voltage battery by calling pre-stored temperature data, which is not limited herein.

Step S20: and when the initial temperature is lower than a first preset temperature, the hybrid controller heats the high-voltage battery through the battery heating water path by using the heat exchanger and the PTC heater.

It should be noted that the first preset temperature is a temperature preset to reflect an initial state of the high-voltage battery of the hybrid vehicle. In the embodiment, the first preset temperature is lower than the normal working temperature of the hybrid electric vehicle. The heat exchanger can be an energy conversion device for converting energy between the engine condensate water and the generator condensate water. In the present embodiment, the energy of the engine condensate is converted to the generator condensate using a heat exchanger. The PTC heater is composed of a PTC ceramic heating element and an aluminum tube. The PTC heater has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater. The PTC heater has high safety performance, and the phenomenon of 'red' on the surface of an electric heating tube heater can not be generated under any application condition, so that potential safety hazards such as scalding, fire and the like are caused. The battery heating water path is used for heating the battery, and the battery heating water path obtains energy from other positions and then transmits the energy of the battery heating water path to the high-voltage battery according to the energy difference, so that the high-voltage battery is heated. The other locations are devices that provide energy to the waterway, such as PTC heaters, heat exchangers, and the like.

In a specific implementation, after the initial temperature of the high-voltage battery is obtained, the state of the high-voltage battery needs to be confirmed according to the initial temperature of the high-voltage battery, and when the initial temperature of the high-voltage battery is lower than a first preset temperature, the high-voltage battery can be determined to be in a low output state. When the high-voltage battery is in a low output state, the heat exchanger is used for energy conversion of engine condensate water and generator condensate water, the PTC heater is used for heating the generator condensate water, and the energy of the generator condensate water is transmitted to the high-voltage battery through the battery heating water channel, so that the high-voltage battery is heated.

The embodiment discloses a high-voltage battery heating method, which comprises the following steps: the initial temperature of the high-voltage battery is obtained, and when the initial temperature is lower than a first preset temperature, the heat exchanger and the PTC heater are used for heating the high-voltage battery through the battery heating water path. Heating high-voltage battery through single heating methods among the prior art, this embodiment high-voltage battery heating system acquires high-voltage battery's initial temperature through the hybrid controller to when initial temperature is less than first preset temperature, heat high-voltage battery through two kinds of heating methods of heat exchanger heating and PTC heater heating, realized high-voltage battery's rapid heating.

Referring to fig. 4, fig. 4 is a schematic flow chart of a second embodiment of the high-voltage battery heating method according to the present invention, and the second embodiment of the high-voltage battery heating method according to the present invention is provided based on the first embodiment shown in fig. 3.

In the second embodiment, the step S20 includes:

step S201: when the initial temperature is lower than a first preset temperature, the hybrid controller controls the engine to heat condensed water in a water path of the engine, and heat of the heated condensed water is transferred to the high-voltage battery through the heat exchanger, so that the high-voltage battery is heated.

The engine interior heats the engine condensate by heat dissipation. The stop valve is a valve for controlling the flow of condensed water in the engine. The high-voltage distribution box is a high-voltage and high-current distribution unit PDU of all pure electric vehicles and plug-in hybrid electric vehicles. The high-voltage distribution box adopts a centralized distribution scheme, the structural design is compact, the wiring layout is convenient, and the maintenance is convenient and rapid. According to the system architecture requirements of different customers, the high-voltage distribution box is also integrated with a part of intelligent control management units of the battery management system, so that the complexity of the whole vehicle system architecture power distribution is further simplified. In an embodiment, control of the PTC heater is achieved by a high voltage distribution box. The control method comprises the steps that the engine is controlled to heat condensed water in an engine water channel, the engine is controlled to be started, and under the condition that the engine is started, the condensed water of the engine is heated by utilizing heat dissipation inside the engine.

In specific implementation, the hybrid controller can control the engine to start through commands, and under the condition of starting the engine, condensed water in the engine is heated by utilizing heat dissipation in the engine. After the heating of the condensed water in the engine is completed, the stop valve is controlled to be opened so as to enable the engine condensed water to flow. When the engine condensate water flows, the heat exchanger is controlled to obtain the energy of the engine condensate water, the energy is transferred to the generator condensate water, and the energy is transferred to the high-voltage battery through the battery heating water path, so that the high-voltage battery is heated.

Step S202: the mixing controller controls the PTC heater to generate heat so as to heat the high-voltage battery.

It should be noted that, in the specific implementation process, the mixing controller may control the PTC heater to generate heat through the high-voltage distribution box 1007, or may control the PTC heater to generate heat through a command mode, so as to heat the generator condensed water, and transmit the energy of the generator condensed water to the high-voltage battery through the battery heating water path.

In specific implementation, the mixing controller may control the high voltage distribution box 1007 to generate a corresponding high level signal or a high level signal in a command manner to control the PTC heater to start operating to generate heat. The generator condensed water receives heat generated by the PTC heater, and the energy of the generator condensed water is transferred to the high-voltage battery through the battery heating water path.

The embodiment discloses a high-voltage battery heating method, which comprises the following steps: the initial temperature of the high-voltage battery is obtained, and when the initial temperature is lower than a first preset temperature, the heat exchanger and the PTC heater are used for heating the high-voltage battery through the battery heating water path. Heating high-voltage battery through single heating methods among the prior art, this embodiment high-voltage battery heating system acquires high-voltage battery's initial temperature through the hybrid controller to when initial temperature is less than first preset temperature, heat high-voltage battery through two kinds of heating methods of heat exchanger heating and PTC heater heating, realized high-voltage battery's rapid heating.

Referring to fig. 5, fig. 5 is a schematic flow chart of a third embodiment of the method for heating a high-voltage battery according to the present invention, and the third embodiment of the method for heating a high-voltage battery according to the present invention is provided based on the first embodiment shown in fig. 3.

In the third embodiment, after the step S20, the method further includes:

step S301: and the mixing controller acquires the inlet temperature and the outlet temperature of the battery heating water path at the high-voltage battery.

The inlet temperature of the high-voltage battery may be a temperature of the condensed water in the battery heating water path immediately before the condensed water comes into contact with the high-voltage battery, and the outlet temperature may be a temperature of the battery heating water path immediately after the condensed water leaves the battery heating water path. For example, the condensed water in the battery heating water path is heated, and the temperature at which the high-voltage battery starts to be heated may be used as the inlet temperature. After the high-voltage battery is heated, the temperature at which the condensed water in the battery heating water path is not heated again can be used as the outlet temperature.

In specific implementation, the hybrid controller may acquire the inlet temperature and the outlet temperature of the battery heating water path at the high-voltage battery by means of acquisition of a temperature sensor. In the specific implementation process, temperature sensors are required to be installed at two ends of the high-voltage battery in advance, the hybrid controller sends out a temperature acquisition instruction, and the temperature sensors feed back current temperature information when receiving the temperature acquisition instruction.

Step S302: and the mixing controller determines the change temperature of the battery heating water path according to the temperature at the inlet and the temperature at the outlet.

The temperature change of the battery heating water path refers to a temperature change of the condensed water in the battery heating water path after the high-voltage battery is heated, that is, a temperature change of the condensed water in the battery heating circuit due to energy absorbed by the high-voltage battery during heating.

In a specific implementation, the hybrid controller may obtain the temperature change by a calculation method after obtaining the inlet temperature and the outlet temperature of the battery heating water path at the high-voltage battery. For example, if the inlet temperature of the battery heating water path at the high voltage battery is 40 degrees celsius and the inlet temperature of the battery heating water path at the high voltage battery is 37 degrees celsius, the temperature change of the condensed water is 3 degrees celsius.

Step S303: and the mixing controller adjusts the heat exchange parameters of the heat exchanger and the heating parameters of the PTC heater according to the change temperature so as to enable the battery heating water path to be in a target heating temperature range.

It should be noted that the heat exchange parameter refers to an efficiency parameter of the heat exchanger for performing heat exchange work, and in the embodiment, the heat exchange parameter of the heat exchanger can be adjusted by opening time of the stop valve. The heating parameter refers to the power of the PTC heater for heating the condensed water in the battery heating waterway. The target heating temperature range refers to a heating temperature range in which the energy absorption efficiency of the high-voltage battery on the condensed water in the battery heating water path is highest when the high-voltage battery is heated.

In specific implementation, the heat exchange parameters of the heat exchanger are adjusted by controlling the time of opening the stop valve according to the value of the change temperature, and the heating parameters of the PTC heater are adjusted by using the high-voltage distribution box in an instruction mode, so that the battery heating water path is in a target heating temperature range. For example, when the change temperature is 0.5 ℃, the energy absorption efficiency of the high-voltage battery on the condensed water in the battery heating water path is low, and the energy absorption efficiency of the high-voltage battery on the condensed water in the battery heating water path is increased by opening the cutoff valve in advance and increasing the heating power of the PTC heater, so that the temperature of the condensed water in the battery heating water path is increased, and the heating efficiency of the high-voltage battery is further increased. When the change temperature is 5 ℃, the high-voltage battery has higher absorption efficiency on the energy of the condensed water in the battery heating water path, and the battery heating water path can be in a target heating temperature range by opening the stop valve in a lagging manner and reducing the heating power of the PTC heater, so that the resource waste is avoided.

Correspondingly, after step 303, the method further includes:

step S401: the hybrid controller acquires a current temperature of the high-voltage battery.

It should be noted that the current temperature of the high-voltage battery is the temperature of the high-voltage battery collected in real time during the heating process. In the specific implementation process, the current temperature of the high-voltage battery can be acquired in a real-time acquisition mode through the temperature sensor.

Step S402: and when the current temperature is higher than the first preset temperature and lower than the second preset temperature, the hybrid controller heats the high-voltage battery by utilizing the heat exchanger through the battery heating water path.

It should be noted that the second preset temperature is preset and is used for determining whether the high-voltage battery needs to be continuously heated. When the high-voltage battery is heated for a period of time to reach a certain temperature range, the efficiency of the high-voltage battery for absorbing heat reaches the maximum value, and the heat exchanger and the PTC heater are still used for heating at the same time, so that unnecessary resource waste is caused.

In a specific implementation, when the current temperature is greater than the first preset temperature and less than the second preset temperature, the hybrid controller may control the high-voltage distribution box to generate a voltage signal for stopping heating, so as to stop heating of the PTC heater. The heat exchanger is independently adopted to heat the high-voltage battery, the heat of the engine is effectively utilized to heat the high-voltage battery, and the effective utilization of resources is realized.

Step S403: and the mixing controller acquires the heating power of the heat exchanger when heating the high-voltage battery.

It should be noted that the heating power is the power of the heat exchanger when the heat exchanger is used alone to heat the high-voltage battery. When the heater is used alone to heat the high-voltage battery, the heating power of the heat exchanger for heating the high-voltage battery needs to be acquired. In the specific implementation process, the heating power of the heat exchanger can be obtained through a series of physical calculation methods by obtaining the working parameters of the heat exchanger.

Step S404: and the mixing controller compares the heating power with a preset heating power.

It should be noted that the preset heating power may be the heating power required by the high-voltage battery. In the heating process of the high-voltage battery, the preset heating power condition needs to be met to ensure the heating timeliness of the high-voltage battery. For example, in a low-temperature environment, the interior of the vehicle also has a heating requirement when the high-voltage battery is heated, and when the vehicle-mounted air conditioner is turned on, the heating power of the heat exchanger is easily caused to fail to meet the preset heating power.

Step S405: and when the heating power is smaller than the preset heating power, the mixing controller compensates the heating power through the PTC heater, so that the compensated heating power is not smaller than the preset heating power.

It should be noted that, when the heating power cannot meet the preset power, the PTC heater may be turned on to compensate the heating power by using the PTC heater, so that the compensated heating power can meet the preset highway requirement. In the specific implementation process, when the heating power is determined to be incapable of meeting the preset power, the PTC heater can be heated through the high-voltage distribution box, and then the compensation of the heating power is realized.

Step S406: and when the current temperature is higher than the second preset temperature, the mixing controller controls the heat exchanger and the PTC heater to stop heating the high-voltage battery.

It should be noted that, when the current temperature is higher than the second preset temperature, the high-voltage battery has already completed the heating process, and the heating of the high-voltage battery needs to be stopped by turning off the heat exchanger and the PTC heater. In the specific implementation process, the mixing controller can stop heating the high-voltage battery by controlling the stop valve and the high-voltage distribution box.

The embodiment discloses a high-voltage battery heating method, which comprises the following steps: the initial temperature of the high-voltage battery is obtained, and when the initial temperature is lower than a first preset temperature, the heat exchanger and the PTC heater are used for heating the high-voltage battery through the battery heating water path. Heating high-voltage battery through single heating methods among the prior art, this embodiment high-voltage battery heating system acquires high-voltage battery's initial temperature through the hybrid controller to when initial temperature is less than first preset temperature, heat high-voltage battery through two kinds of heating methods of heat exchanger heating and PTC heater heating, realized high-voltage battery's rapid heating.

Other embodiments or specific implementation manners of the high-voltage battery heating method according to the present invention may refer to the above-mentioned method embodiments, and are not described herein again.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second and third, etcetera do not indicate any ordering and these words are to be interpreted as names.

Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a Read Only Memory (ROM)/Random Access Memory (RAM), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (6)

1. A high voltage battery heating system, the system comprising: the device comprises a mixing controller, a heat exchanger, a PTC heater and a high-voltage battery;

the mixing controller is respectively and electrically connected with the heat exchanger, the PTC heater and the high-voltage battery, and the high-voltage battery is connected with the heat exchanger and the PTC heater through a battery heating water path;

the hybrid controller is used for acquiring the initial temperature of the high-voltage battery, wherein the initial temperature refers to the temperature of the high-voltage battery before the hybrid vehicle is started;

the hybrid controller is further used for heating the high-voltage battery through the battery heating waterway by using the PTC heater controlled by the heat exchanger and the high-voltage distribution box when the initial temperature is lower than a first preset temperature;

the mixing controller is further used for acquiring the inlet temperature and the outlet temperature of the battery heating water path at the high-voltage battery;

the mixing controller is further used for determining the change temperature of the battery heating water path according to the inlet temperature and the outlet temperature;

the mixing controller is further used for adjusting heat exchange parameters of the heat exchanger and heating parameters of the PTC heater according to the change temperature so that the battery heating water path is in a target heating temperature range, and the target heating temperature range refers to a heating temperature range with the highest energy absorption efficiency of the high-voltage battery on condensed water in the battery heating water path when the high-voltage battery is heated;

when the initial temperature is lower than a first preset temperature, the step of heating the high-voltage battery through the battery heating waterway by using the PTC heater controlled by the heat exchanger and the high-voltage distribution box specifically comprises:

the hybrid controller is further used for controlling the engine to heat condensed water in a water path of the engine when the initial temperature is lower than a first preset temperature, and transferring heat of the heated condensed water to the high-voltage battery through the heat exchanger so as to heat the high-voltage battery;

the mixing controller is also used for controlling the PTC heater to generate heat so as to heat the high-voltage battery.

2. The system of claim 1, wherein the hybrid controller is further configured to obtain a current temperature of the high voltage battery;

the hybrid controller is further used for heating the high-voltage battery through the battery heating waterway by independently utilizing the heat exchanger when the current temperature is higher than the first preset temperature and lower than a second preset temperature;

the mixing controller is further used for controlling the heat exchanger and the PTC heater to stop heating the high-voltage battery when the current temperature is higher than the second preset temperature.

3. The system of claim 2, wherein the hybrid controller is further configured to obtain heating power for the heat exchanger to heat the high-voltage battery;

the mixing controller is also used for comparing the heating power with a preset heating power;

and the mixing controller is also used for compensating the heating power through the PTC heater when the heating power is smaller than the preset heating power, so that the compensated heating power is not smaller than the preset heating power.

4. A method of high-voltage battery heating based on the high-voltage battery heating system according to any one of claims 1 to 3, characterized by comprising:

the hybrid controller acquires an initial temperature of the high-voltage battery, wherein the initial temperature refers to the temperature of the high-voltage battery before the hybrid vehicle is started;

when the initial temperature is lower than a first preset temperature, the mixing controller heats the high-voltage battery through the battery heating waterway by using the heat exchanger and the PTC heater controlled by the high-voltage distribution box;

when the initial temperature is lower than a first preset temperature, the mixing controller further comprises, after the step of heating the high-voltage battery by using the heat exchanger and the PTC heater through the battery heating water path:

the mixing controller acquires the inlet temperature and the outlet temperature of the battery heating waterway at the high-voltage battery;

the mixing controller determines the change temperature of the battery heating water path according to the inlet temperature and the outlet temperature;

the mixing controller adjusts heat exchange parameters of the heat exchanger and heating parameters of the PTC heater according to the change temperature so that the battery heating water path is in a target heating temperature range, wherein the target heating temperature range refers to a heating temperature range with highest energy absorption efficiency of the high-voltage battery on condensed water in the battery heating water path when the high-voltage battery is heated;

when the initial temperature is lower than a first preset temperature, the step of heating the high-voltage battery by the PTC heater controlled by the heat exchanger and the high-voltage distribution box through the battery heating water path by the hybrid controller comprises the following steps:

when the initial temperature is lower than a first preset temperature, the hybrid controller controls the engine to heat condensed water in a water path of the engine, and heat of the heated condensed water is transferred to the high-voltage battery through the heat exchanger so as to heat the high-voltage battery;

the mixing controller controls the PTC heater to generate heat so as to heat the high-voltage battery.

5. The method of claim 4, wherein the step of the mixing controller adjusting the heat exchange parameter of the heat exchanger and the heating parameter of the PTC heater based on the varying temperature to bring the battery heating water circuit within a target heating temperature range further comprises:

the hybrid controller acquires the current temperature of the high-voltage battery;

when the current temperature is higher than the first preset temperature and lower than a second preset temperature, the hybrid controller independently utilizes the heat exchanger to heat the high-voltage battery through the battery heating waterway;

and when the current temperature is higher than the second preset temperature, the mixing controller controls the heat exchanger and the PTC heater to stop heating the high-voltage battery.

6. The method of claim 5, wherein the mixing controller, after the step of heating the high voltage battery through the battery heating water circuit using the heat exchanger when the current temperature is greater than the first preset temperature and less than a second preset temperature, further comprises:

the mixing controller obtains the heating power of the heat exchanger when heating the high-voltage battery;

the mixing controller compares the heating power with a preset heating power;

and when the heating power is smaller than the preset heating power, the mixing controller compensates the heating power through the PTC heater, so that the compensated heating power is not smaller than the preset heating power.

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