Heating Control Method, Device and New Energy Vehicle of New Energy Vehicle

Abstract

The present invention discloses a heating control method, device and new energy vehicle. When only a battery pack heating request is received, the battery pack heating circuit is opened and the power of the electric heater is adjusted to heat the battery pack alone. When both a battery pack heating request and a passenger compartment heating request are received, the passenger compartment heating circuit is opened and the power of the electric heater is adjusted to heat the passenger compartment alone. When the passenger compartment is heated to meet the preset heating condition, the power of the electric heater is adjusted, and the heat generated by the electric heater is proportionally distributed according to the respective heating requirements of the battery pack and the passenger compartment to heat the battery pack and the passenger compartment simultaneously, and the heating water temperature of the passenger compartment meets the requirements of the passenger compartment target water temperature. By distinguishing between the scenario of heating the battery pack alone and the scenario of heating the battery pack and the passenger compartment simultaneously, and adopting different heating strategies for different heating scenarios, the present invention maximally saves the energy consumed by the electric heater for heating.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and more specifically, to a heating control method, device and new energy vehicle for a new energy vehicle. Background Art

[0002] Currently, new energy vehicles generally use lithium-ion batteries as power batteries. When lithium-ion batteries are used in a low-temperature environment, they need to be heated first. In the prior art, an electric heater is generally used to heat the battery pack of a new energy vehicle. When the ambient temperature of the new energy vehicle is relatively low, the electric heater also needs to heat the passenger compartment. The electric heater heats the water temperature in the total heating circuit to a fixed water temperature value, and then the vehicle controller changes the hot water flowing into the battery pack heating circuit or the passenger compartment heating circuit in the total heating circuit by adjusting the proportional valve, so as to achieve the purpose of heating the battery pack and the passenger compartment.

[0003] In the traditional solution, for all heating scenarios of new energy vehicles, the electric heater heats all the water to a fixed water temperature value. Since the fixed water temperature value is usually relatively high, such as 90°C, for the single heating scenario of the battery pack, not only does it increase the energy consumption of the electric heater, but also causes energy waste. For example, a water temperature of 40°C can meet the needs of the single heating of the battery pack. If the electric heater heats the water temperature to 90°C, the water temperature will be heated by an additional 50°C, resulting in increased heat dissipation in the environment. Summary of the Invention

[0004] In view of this, the present invention discloses a heating control method, device and new energy vehicle for a new energy vehicle, so as to distinguish between the single heating scenario of the battery pack and the simultaneous heating scenario of the battery pack and the passenger compartment, and adopt different heating strategies for different heating scenarios to maximize the energy saved by the heating of the electric heater.

[0005] A heating control method for a new energy vehicle includes:

[0006] After receiving a battery pack heating request, determine whether a passenger compartment heating request is received;

[0007] If not, open the battery pack heating circuit and adjust the power of the electric heater to change the water temperature at the battery pack inlet to heat the battery pack alone;

[0008] If so, open the passenger compartment heating circuit and adjust the power of the electric heater to change the water temperature at the passenger compartment inlet to heat the passenger compartment alone;

[0009] When the occupant compartment is heated to meet the preset heating conditions, adjust the power of the electric heater, and proportionally distribute the heat generated by the electric heater according to the heating requirements of the battery pack and the occupant compartment respectively, so as to heat the battery pack and the occupant compartment simultaneously, and make the heating water temperature of the occupant compartment meet the target water temperature requirement of the occupant compartment.

[0010] Optionally, opening the battery pack heating circuit and adjusting the power of the electric heater to change the water temperature at the inlet of the battery pack to heat the battery pack alone specifically includes:

[0011] Open the battery pack heating circuit;

[0012] Obtain the current water temperature at the inlet of the battery pack fed back by the battery pack;

[0013] Adjust the power of the electric heater to make the current water temperature at the inlet of the battery pack reach the target water temperature of the battery pack.

[0014] Optionally, after the step of opening the battery pack heating circuit, it further includes:

[0015] Obtain the current battery pack temperature;

[0016] Judge whether the current battery pack temperature reaches the target temperature of the battery pack;

[0017] If so, stop heating the battery pack.

[0018] Optionally, it further includes:

[0019] When the current battery pack temperature does not reach the target temperature of the battery pack, judge whether the heating request of the occupant compartment is received;

[0020] If so, stop heating the battery pack and start heating the occupant compartment alone.

[0021] Optionally, the preset heating conditions include: the separate heating time of the occupant compartment exceeds the first preset time threshold, or the difference between the separate heating temperature of the occupant compartment and the set temperature meets the preset difference range.

[0022] Optionally, after the step of adjusting the power of the electric heater and proportionally adjusting the water temperature at the inlet of the battery pack and the water temperature at the inlet of the occupant compartment to heat the battery pack and the occupant compartment simultaneously, and making the heating water temperature of the occupant compartment meet the target water temperature requirement of the occupant compartment, it further includes:

[0023] Obtain the current water temperature at the inlet of the battery pack and the current water temperature of the electric heater heating circuit;

[0024] Based on the current water temperature at the battery pack inlet and the current water temperature in the electric heater heating circuit, control the opening degree of the proportional valve to change the water flow rate in the battery pack heating circuit, so that the current water temperature at the battery pack inlet is the target regulated water temperature of the battery pack.

[0025] Optionally, after the current water temperature at the battery pack inlet is the target regulated water temperature of the battery pack, it further includes:

[0026] Judge whether the current power of the electric heater is the maximum power;

[0027] If not, adjust the current power of the electric heater to continue heating the battery pack, and make the heating water temperature in the passenger compartment meet the requirements of the target water temperature in the passenger compartment;

[0028] If so, calculate the current water temperature difference between the current heating water temperature in the passenger compartment and the target water temperature in the passenger compartment;

[0029] Judge whether the water temperature difference time maintains a second preset time threshold, where the water temperature difference time is: the time when the current water temperature difference is less than the water temperature difference threshold;

[0030] If so, determine that the water temperature difference time is a multiple n of the second preset time threshold;

[0031] Based on the multiple n, obtain that the target regulated water temperature of the battery pack is (m - n*△T), where m is the target water temperature of the battery pack, n is a natural number rounded down, and △T is the water temperature drop amplitude, which is a fixed value.

[0032] Optionally, after obtaining the target regulated water temperature of the battery pack, it further includes:

[0033] Obtain the current battery pack temperature;

[0034] Judge whether the temperature difference between the target regulated water temperature of the battery pack and the current battery pack temperature is greater than the preset temperature difference value;

[0035] If not, stop heating the battery pack;

[0036] If so, execute again the step of controlling the opening degree of the proportional valve based on the current water temperature at the battery pack inlet and the current water temperature in the electric heater heating circuit, changing the water flow rate in the battery pack and the heating circuit, so that the current water temperature at the battery pack inlet is the target regulated water temperature of the battery pack.

[0037] A heating control device for a new energy vehicle, comprising:

[0038] A judgment unit, configured to judge whether a passenger compartment heating request is received after receiving a battery pack heating request;

[0039] The battery pack independent heating unit is used to open the battery pack heating circuit and adjust the power of the electric heater to change the water temperature at the inlet of the battery pack for independently heating the battery pack when the judgment unit determines it as no.

[0040] The passenger compartment independent heating unit is used to open the passenger compartment heating circuit and adjust the power of the electric heater to change the water temperature at the inlet of the passenger compartment for independently heating the passenger compartment when the judgment unit determines it as yes.

[0041] The simultaneous heating unit is used to adjust the power of the electric heater and proportionally distribute the heat generated by the electric heater according to the respective heating requirements of the battery pack and the passenger compartment when the passenger compartment is heated to meet the preset heating condition, so as to simultaneously heat the battery pack and the passenger compartment and make the heating water temperature of the passenger compartment meet the requirement of the passenger compartment target water temperature.

[0042] A new energy vehicle includes the heating control device of the new energy vehicle described above.

[0043] As can be seen from the above technical solutions, the present invention discloses a heating control method, device and new energy vehicle for a new energy vehicle. When only a battery pack heating request is received, the battery pack heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the battery pack for independently heating the battery pack. When both a battery pack heating request and a passenger compartment heating request are received, to accelerate the heating speed of the passenger compartment, the passenger compartment heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the passenger compartment for independently heating the passenger compartment. When the passenger compartment is heated to meet the preset heating condition, the power of the electric heater is adjusted, and the heat generated by the electric heater is proportionally distributed according to the respective heating requirements of the battery pack and the passenger compartment, so as to simultaneously heat the battery pack and the passenger compartment and make the heating water temperature of the passenger compartment meet the requirement of the passenger compartment target water temperature. By distinguishing between the scenario of independently heating the battery pack and the scenario of simultaneously heating the battery pack and the passenger compartment, and adopting different heating strategies for different heating scenarios, the present invention maximally saves the energy consumed by the electric heater for heating, and adjusts the water temperature at the inlet of the battery pack in real time by adjusting the power of the electric heater to maximally meet the heating requirement of the battery pack. At the same time, in the scenario of simultaneously heating the battery pack and the passenger compartment, it can ensure that the heating water temperature of the passenger compartment meets the requirement of the passenger compartment target water temperature. Therefore, the present invention can effectively use the energy generated by the electric heater for heating the battery pack and the passenger compartment in various heating scenarios. Description of the Drawings

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the disclosed accompanying drawings.

[0045] Figure 1 Flowchart of a heating control method for a new energy vehicle disclosed in an embodiment of the present invention;

[0046] Figure 2 Flowchart of a method for separately heating a battery pack disclosed in an embodiment of the present invention;

[0047] Figure 3 Flowchart of another heating control method for a new energy vehicle disclosed in an embodiment of the present invention;

[0048] Figure 4 Structure diagram of a heating control device for a new energy vehicle disclosed in an embodiment of the present invention. Detailed implementation manners

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0050] An embodiment of the present invention discloses a heating control method, device and new energy vehicle. When only a battery pack heating request is received, the battery pack heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the battery pack to heat the battery pack alone. When both a battery pack heating request and a passenger compartment heating request are received, to accelerate the heating speed of the passenger compartment, the passenger compartment heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the passenger compartment to heat the passenger compartment alone. When the passenger compartment is heated to meet the preset heating condition, the power of the electric heater is adjusted, and the heat generated by the electric heater is proportionally distributed according to the respective heating requirements of the battery pack and the passenger compartment, so as to heat the battery pack and the passenger compartment simultaneously and make the heating water temperature of the passenger compartment meet the requirement of the target water temperature of the passenger compartment. By distinguishing between the scenario of heating the battery pack alone and the scenario of heating the battery pack and the passenger compartment simultaneously, and adopting different heating strategies for different heating scenarios, the present invention maximally saves the energy consumed by the electric heater for heating. By adjusting the power of the electric heater, the water temperature at the inlet of the battery pack is adjusted in real time to maximally meet the heating requirement of the battery pack. At the same time, in the scenario of heating the battery pack and the passenger compartment simultaneously, it can ensure that the heating water temperature of the passenger compartment meets the requirement of the target water temperature of the passenger compartment. Therefore, the present invention can effectively use the energy generated by the electric heater for heating the battery pack and the passenger compartment in various heating scenarios.

[0051] See Figure 1 , a flowchart of a heating control method for a new energy vehicle disclosed in an embodiment of the present invention. This method is applied to a vehicle controller, and the method includes:

[0052] Step S101: After receiving a battery pack heating request, determine whether a passenger compartment heating request is received. If not, execute step S102; if so, execute step S103;

[0053] After the new energy vehicle is started, when the battery controller determines that the battery pack needs to be heated, the battery controller will send a battery pack heating request to the vehicle controller. When the vehicle controller receives the battery pack heating request, it can be determined that the battery pack needs to be heated. Conversely, when the vehicle controller does not receive the battery pack heating request, it can be determined that the battery pack does not need to be heated at present. In this case, the heating control method disclosed in the present invention is not executed.

[0054] When the new energy vehicle turns on the air conditioner for heating, the air conditioner controller in the vehicle will send a passenger compartment heating request to the vehicle controller. When the vehicle controller receives the passenger compartment heating request, it indicates that both the battery pack and the passenger compartment need to be heated at this time. Conversely, when the vehicle controller does not receive the passenger compartment heating request, it indicates that only the battery pack needs to be heated at this time.

[0055] Step S102: Open the battery pack heating circuit, and adjust the power of the electric heater to change the water temperature at the battery pack inlet, and heat the battery pack separately.

[0056] In practical applications, the battery pack heating circuit can be opened by adjusting the opening degree of the proportional valve. The battery pack heating circuit can be partially opened or fully opened. To accelerate the heating speed of the battery pack, the battery pack heating circuit is preferably fully opened.

[0057] The electric heater in this embodiment can be a PTC (Positive Temperature Coefficient) electric heater, that is, a thermistor heater.

[0058] In this embodiment, the power of the electric heater is continuously adjustable. The water temperature at the battery pack inlet is gradually increased by gradually increasing the power of the electric heater, or the water temperature at the battery pack inlet is gradually decreased by gradually decreasing the power of the electric heater.

[0059] It should be particularly noted that the water temperature at the battery pack inlet refers to the water temperature at the liquid inlet end of the battery pack in the battery pack loop system that is connected to the heating pipeline.

[0060] In practical applications, the electric heater can directly heat the battery pack by changing the water temperature at the battery pack inlet, or the electric heater changes the water temperature at the battery pack inlet through a heat exchanger, and then heats the battery pack.

[0061] Step S103: Open the passenger compartment heating circuit, and adjust the power of the electric heater to change the water temperature at the passenger compartment inlet, and heat the passenger compartment separately.

[0062] The water temperature at the passenger compartment inlet refers to: the water temperature at the liquid inlet end of the vehicle air conditioner in the passenger compartment heating circuit system that is connected to the heating pipeline.

[0063] In practical applications, the passenger compartment heating circuit can be opened by adjusting the opening degree of the proportional valve. The passenger compartment heating circuit and the battery pack heating circuit can share a proportional valve, or the passenger compartment heating circuit and the battery pack heating circuit each have a separate proportional valve.

[0064] When it is necessary to heat both the battery pack and the passenger compartment, to accelerate the heating speed of the passenger compartment, the present invention will first stop heating the battery pack, and then directly heat the passenger compartment.

[0065] There are various ways to stop heating the battery pack in this embodiment. For example, the battery pack heating circuit is closed through the proportional valve to stop heating the battery pack, or the electric heater stops heating the water in the battery pack heating circuit.

[0066] Step S104: When the occupant compartment is heated to meet the preset heating condition, adjust the power of the electric heater, and proportionally distribute the heat generated by the electric heater according to the heating requirements of the battery pack and the occupant compartment respectively, so as to heat the battery pack and the occupant compartment simultaneously, and make the heating water temperature of the occupant compartment meet the target water temperature requirement of the occupant compartment. In this mode, the occupant compartment is preferentially heated, and the heating of the battery pack is taken into account on the premise of ensuring the user's physical sensation.

[0067] Among them, the preset heating condition can be: the single heating time of the occupant compartment exceeds the first preset time threshold. The single heating time of the occupant compartment is timed from the start of heating the occupant compartment (i.e., the start time of air-conditioning heating). The value of the first preset time threshold is determined according to actual needs. For example, the first preset time threshold is 10 min.

[0068] Or, the preset heating condition can be: the difference between the single heating temperature of the occupant compartment and the set temperature meets the preset difference range. The values of the set temperature and the preset difference range are determined according to actual needs. For example, the preset difference range is [-1℃, 1℃].

[0069] To sum up, the present invention discloses a heating control method for a new energy vehicle. When only receiving a battery pack heating request, the battery pack heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the battery pack to heat the battery pack alone. When receiving both a battery pack heating request and an occupant compartment heating request at the same time, to accelerate the heating speed of the occupant compartment, the occupant compartment heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the occupant compartment to heat the occupant compartment alone. When the occupant compartment is heated to meet the preset heating condition, the power of the electric heater is adjusted, and the heat generated by the electric heater is proportionally distributed according to the heating requirements of the battery pack and the occupant compartment respectively, so as to heat the battery pack and the occupant compartment simultaneously, and make the heating water temperature of the occupant compartment meet the target water temperature requirement of the occupant compartment. By distinguishing between the single heating scenario of the battery pack and the simultaneous heating scenario of the battery pack and the occupant compartment, and adopting different heating strategies for different heating scenarios, the present invention maximally saves the energy consumed by the electric heater for heating. By adjusting the power of the electric heater to adjust the water temperature at the inlet of the battery pack in real time, the heating requirement of the battery pack is maximally met. At the same time, in the simultaneous heating scenario of the battery pack and the occupant compartment, it can ensure that the heating water temperature of the occupant compartment meets the target water temperature requirement of the occupant compartment. Therefore, the present invention can effectively use the energy generated by the electric heater for heating the battery pack and the occupant compartment in various heating scenarios.

[0070] To further optimize the above embodiment, refer to Figure 2 , the flowchart of a method for heating the battery pack alone disclosed in the embodiment of the present invention, that is, step S102 can specifically include:

[0071] Step S201: Open the battery pack heating circuit;

[0072] In practical applications, the battery pack heating circuit can be opened through a proportional valve.

[0073] Step S202: Obtain the current water temperature at the battery pack inlet feedback by the battery pack.

[0074] Step S203: Adjust the power of the electric heater so that the current water temperature at the battery pack inlet reaches the target water temperature of the battery pack.

[0075] Among them, the value of the target water temperature of the battery pack is determined according to actual needs. For example, it is 40°C.

[0076] It can be understood that the current water temperature at the battery pack inlet feedback by the battery pack can be obtained periodically, and then adjusted continuously. The vehicle controller adjusts the power of the electric heater based on the current water temperature at the battery pack inlet feedback by the battery pack to ensure that the current water temperature at the battery pack inlet reaches the target water temperature of the battery pack. For example, the target water temperature of the battery pack is 40°C. In practical applications, the entire battery pack heating circuit can be opened, and the current water temperature at the battery pack inlet can be adjusted by adjusting the power of the electric heater to avoid the electric heater working at full power.

[0077] To further optimize the above embodiment, after opening the battery pack heating circuit in step S201, it may further include:

[0078] Step S204: Obtain the current battery pack temperature.

[0079] The current battery pack temperature in this embodiment can be the temperature of the inner core of the current battery pack.

[0080] Step S205: Determine whether the current battery pack temperature reaches the target temperature of the battery pack. If so, execute step S206;

[0081] Step S206: Stop heating the battery pack.

[0082] During the heating process of the battery pack, the vehicle controller will monitor the battery pack temperature in real time. When the battery pack temperature reaches the target temperature of the battery pack, the heating of the battery pack will be stopped. Among them, the value of the target temperature of the battery pack is determined according to actual needs, and the present invention does not limit it here.

[0083] To further optimize the above embodiment, when the determination in step S205 is negative, it further includes:

[0084] Step S207: Determine whether a request for heating the passenger compartment is received. If not, return to step S202. If so, execute step S208;

[0085] Step S208: Stop heating the battery pack and start heating the passenger compartment separately.

[0086] In the present invention, when it is necessary to heat both the battery pack and the passenger compartment, in order to accelerate the heating speed of the passenger compartment, the present invention will first stop heating the battery pack and then preferentially heat the passenger compartment.

[0087] When it is necessary to heat the battery pack and the passenger compartment simultaneously, to further optimize the above embodiment, refer to Figure 3 , another flowchart of the heating control method for a new energy vehicle disclosed in the embodiment of the present invention. After step S104, it may further include:

[0088] Step S105: Obtain the current water temperature at the inlet of the battery pack and the current water temperature of the electric heater heating circuit;

[0089] Step S106: Based on the current water temperature at the inlet of the battery pack and the current water temperature of the electric heater heating circuit, control the opening degree of the proportional valve to change the water flow rate in the battery pack heating circuit, so that the current water temperature at the inlet of the battery pack is the target regulated water temperature of the battery pack.

[0090] Wherein, the proportional valve is used to control the water flow rate in the battery pack heating circuit.

[0091] In this embodiment, the vehicle controller controls the opening degree of the proportional valve according to the real-time water temperature at the inlet of the battery pack and the water temperature of the battery pack heating circuit, so that the water temperature at the inlet of the battery pack is the target regulated water temperature of the battery pack in real time.

[0092] Specifically, by increasing the opening degree of the proportional valve to increase the water flow rate in the battery pack heating circuit, so as to increase the current water temperature of the electric heater heating circuit, thereby increasing the water temperature at the inlet of the battery pack. Conversely, by decreasing the opening degree of the proportional valve to decrease the water flow rate in the battery pack heating circuit, so as to decrease the current water temperature of the electric heater heating circuit, thereby decreasing the water temperature at the inlet of the battery pack.

[0093] To further optimize the above embodiment, after step S106, it may further include:

[0094] Step S107: Determine whether the current power of the electric heater is the maximum power. If not, return to step S104. If so, execute step S108;

[0095] In this embodiment, when the current power of the electric heater is not the maximum power, it indicates that the power of the electric heater can still be increased. At this time, adjust the power of the electric heater to heat the battery pack and make the heating water temperature of the passenger compartment meet the requirements of the target water temperature of the passenger compartment.

[0096] Step S108: Calculate the current water temperature difference between the current heating water temperature of the passenger compartment and the target water temperature of the passenger compartment;

[0097] Step S109: Determine whether the water temperature difference time maintains the second preset time threshold. If so, execute Step S110; if not, return to Step S104;

[0098] Among them, the water temperature difference time is the time when the current water temperature difference is less than the water temperature difference threshold. The value of the water temperature difference threshold is determined according to actual needs, such as 3°C. The value of the second preset time threshold is determined according to actual needs, such as 1 min.

[0099] In the present invention, while ensuring that the heating water temperature of the passenger compartment meets the requirements of the target water temperature of the passenger compartment, the water temperature of the battery pack is adjusted. When the water temperature difference between the heating water temperature of the passenger compartment and the target water temperature of the passenger compartment is less than the water temperature difference threshold and maintains the second preset time threshold, it indicates that the electric heater needs to appropriately reduce the heating water temperature of the battery pack and increase the heating water temperature of the passenger compartment to ensure that the heating water temperature of the passenger compartment meets the requirements of the target water temperature of the passenger compartment.

[0100] Step S110: Determine that the water temperature difference time is a multiple n of the second preset time threshold;

[0101] In this embodiment, n is a natural number obtained by rounding down. For example, 0.8 is taken as 0, and 1.1 is taken as 1.

[0102] Step S111: Obtain the target adjusted water temperature of the battery pack based on the multiple n;

[0103] The target adjusted water temperature of the battery pack is (m - n * △T), where m is the target water temperature of the battery pack. The target water temperature of the battery pack is the water temperature carried in the battery pack heating request. For example, 40°C, and △T is the water temperature drop amplitude, which is a fixed value, such as 10°C. The value of the second preset time threshold is determined according to actual needs, such as 1 min.

[0104] For example, when the battery pack target water temperature carried in the battery pack heating request sent for the first time is 40°C and △T is 10°C, during the battery pack heating control process, when n changes from 0 to 1, the target adjusted water temperature of the battery pack is (40 - 1 * 10)°C = 30°C. Therefore, the inlet water temperature of the battery pack is reduced to ensure the heating of the passenger compartment and enable the energy generated by the electric heater to be fully utilized.

[0105] When the value of n increases, the corresponding target adjusted water temperature of the battery pack will decrease by a water temperature drop amplitude △T. Compared with the original target water temperature m of the battery pack, the water temperature is reduced by n * △T in total.

[0106] To further optimize the above embodiment, after Step S111, it may further include:

[0107] Step S112: Obtain the current battery pack temperature;

[0108] Step S113: Determine whether the temperature difference between the target regulated water temperature of the battery pack and the current temperature of the battery pack is greater than a preset temperature difference value. If not, execute Step S114; if so, return to execute Step S106.

[0109] Step S114: Stop heating the battery pack.

[0110] Specifically, find the temperature difference by subtracting the current temperature of the battery pack from the target regulated water temperature of the battery pack finally obtained in Step S111. When this temperature difference is not greater than the preset temperature difference value, for example, 10°C, it indicates that the temperature difference of the battery pack is too small at this time, and the heating effect on the battery pack is relatively poor. To save energy, stop heating the battery pack. For example, stop heating the battery pack by closing the heating circuit of the battery pack through a proportional valve, or the electric heater stops heating the water in the heating circuit of the battery pack.

[0111] When the temperature difference is greater than the preset temperature difference value, start heating the battery pack again.

[0112] Corresponding to the above method embodiment, the present invention also discloses a heating control device for a new energy vehicle.

[0113] See Figure 4 , a schematic structural diagram of a heating control device for a new energy vehicle disclosed in an embodiment of the present invention. This device is applied to a vehicle controller, and the device includes:

[0114] A judgment unit 301, configured to judge whether a passenger compartment heating request is received when a battery pack heating request is received.

[0115] After the new energy vehicle is started, when the battery controller determines that the battery pack needs to be heated, the battery controller will send a battery pack heating request to the vehicle controller. When the vehicle controller receives the battery pack heating request, it can determine that the battery pack needs to be heated. On the contrary, when the vehicle controller does not receive the battery pack heating request, it can be determined that the battery pack does not need to be heated at present. In this case, the heating control device disclosed in the present invention is not executed.

[0116] When the new energy vehicle turns on the air conditioner for heating, the air conditioner controller in the vehicle will send a passenger compartment heating request to the vehicle controller. When the vehicle controller receives the passenger compartment heating request, it indicates that both the battery pack and the passenger compartment need to be heated at this time. On the contrary, when the vehicle controller does not receive the passenger compartment heating request, it indicates that only the battery pack needs to be heated at this time.

[0117] In this embodiment, the power of the electric heater is continuously adjustable. The water temperature at the inlet of the battery pack is gradually increased by gradually increasing the power of the electric heater, or the water temperature at the inlet of the battery pack is gradually decreased by gradually decreasing the power of the electric heater.

[0118] It should be specifically noted that the water temperature at the battery pack inlet refers to the water temperature at the liquid inlet end of the battery pack in the battery pack loop system that is connected to the heating pipeline.

[0119] The battery pack independent heating unit 302 is used to open the battery pack heating loop when the judgment unit 301 judges negatively, and adjust the power of the electric heater to change the water temperature at the battery pack inlet, and independently heat the battery pack.

[0120] In practical applications, the battery pack heating loop can be opened by adjusting the opening degree of the proportional valve. The battery pack heating loop can be partially opened or fully opened. To accelerate the heating speed of the battery pack, the battery pack heating loop is preferably fully opened.

[0121] The passenger compartment independent heating unit 303 is used to open the passenger compartment heating loop when the judgment unit 301 judges positively, and adjust the power of the electric heater to change the water temperature at the passenger compartment inlet, and independently heat the passenger compartment.

[0122] The water temperature at the passenger compartment inlet refers to: the water temperature at the liquid inlet end of the vehicle air conditioner in the passenger compartment heating loop system that is connected to the heating pipeline.

[0123] In practical applications, the passenger compartment heating loop can be opened by adjusting the opening degree of the proportional valve. The passenger compartment heating loop and the battery pack heating loop can share a proportional valve, or the passenger compartment heating loop and the battery pack heating loop each have a separate proportional valve.

[0124] When it is necessary to heat both the battery pack and the passenger compartment, to accelerate the heating speed of the passenger compartment, the present invention will first stop heating the battery pack, and then preferentially heat the passenger compartment.

[0125] There are various ways to stop heating the battery pack in this embodiment. For example, the battery pack heating loop can be closed through the proportional valve to stop heating the battery pack, or the electric heater can stop heating the water in the battery pack heating loop.

[0126] The simultaneous heating unit 304 is used to adjust the power of the electric heater when the passenger compartment is heated to meet the preset heating condition, and proportionally distribute the heat generated by the electric heater according to the respective heating requirements of the battery pack and the passenger compartment, so as to simultaneously heat the battery pack and the passenger compartment, and make the heating water temperature of the passenger compartment meet the passenger compartment target water temperature requirement.

[0127] Among them, the preset heating condition can be: the independent heating time of the passenger compartment exceeds the first preset time threshold. The independent heating time of the passenger compartment is timed from the start of heating the passenger compartment (i.e., the start time of air conditioning heating). The value of the first preset time threshold is determined according to actual needs. For example, the first preset time threshold is 10 min.

[0128] Alternatively, the preset heating condition may be that the difference between the individual heating temperature of the passenger compartment and the set temperature satisfies a preset difference range. The values of the set temperature and the preset difference range are determined according to actual needs. For example, the preset difference range is [-1°C, 1°C], and the individual heating temperature of the passenger compartment is also the in-vehicle temperature.

[0129] In summary, the present invention discloses a heating control device for a new energy vehicle. When only a battery pack heating request is received, the battery pack heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the battery pack to heat the battery pack alone. When both a battery pack heating request and a passenger compartment heating request are received, to accelerate the heating speed of the passenger compartment, the passenger compartment heating circuit is opened, and the power of the electric heater is adjusted to change the water temperature at the inlet of the passenger compartment to heat the passenger compartment alone. When the passenger compartment is heated to meet the preset heating condition, the power of the electric heater is adjusted, and the heat generated by the electric heater is proportionally distributed according to the respective heating requirements of the battery pack and the passenger compartment to heat the battery pack and the passenger compartment simultaneously, and the heating water temperature of the passenger compartment meets the requirements of the passenger compartment target water temperature. The present invention distinguishes between the scenario of heating the battery pack alone and the scenario of heating the battery pack and the passenger compartment simultaneously, and adopts different heating strategies for different heating scenarios to maximize the energy saved by the heating of the electric heater. By adjusting the power of the electric heater, the water temperature at the inlet of the battery pack is adjusted in real time to maximize the satisfaction of the heating requirements of the battery pack. At the same time, in the scenario of heating the battery pack and the passenger compartment simultaneously, it can ensure that the heating water temperature of the passenger compartment meets the requirements of the passenger compartment target water temperature. Therefore, the present invention can effectively use the energy generated by the electric heater for heating the battery pack and the passenger compartment in various heating scenarios.

[0130] To further optimize the above embodiment, the battery pack single heating unit 302 may specifically be used for:

[0131] Open the battery pack heating circuit;

[0132] Obtain the current water temperature at the inlet of the battery pack fed back by the battery pack;

[0133] Adjust the power of the electric heater to make the current water temperature at the inlet of the battery pack reach the battery pack target water temperature, where the battery pack target water temperature is the water temperature carried in the battery pack heating request.

[0134] The vehicle controller adjusts the power of the electric heater according to the current water temperature at the inlet of the battery pack fed back by the battery pack to ensure that the current water temperature at the inlet of the battery pack reaches the battery pack target water temperature. For example, the battery pack target water temperature is 40°C. In actual applications, the entire battery pack heating circuit can be opened, and the current water temperature at the inlet of the battery pack can be adjusted by adjusting the power of the electric heater to avoid the electric heater working at full power.

[0135] To further optimize the above embodiments, the battery pack independent heating unit 302 may specifically further be configured to:

[0136] Obtain the current battery pack temperature;

[0137] Determine whether the current battery pack temperature reaches the battery pack target temperature;

[0138] If so, stop heating the battery pack.

[0139] To further optimize the above embodiments, the battery pack independent heating unit 302 may specifically further be configured to:

[0140] When the current battery pack temperature does not reach the battery pack target temperature, determine whether the occupant compartment heating request is received;

[0141] If not, return to continue adjusting the power of the electric heater according to the current battery pack inlet water temperature fed back by the battery pack;

[0142] If so, stop heating the battery pack and start heating the occupant compartment independently.

[0143] When it is necessary to heat the battery pack and the occupant compartment simultaneously, to further optimize the above embodiments, the heating control device may further include:

[0144] A water temperature acquisition unit, configured to acquire the current battery pack inlet water temperature and the current electric heater heating circuit water temperature after the simultaneous heating unit 304 adjusts the power of the electric heater to heat the battery pack and makes the heating water temperature of the occupant compartment meet the requirements of the occupant compartment target water temperature;

[0145] A control unit, configured to control the opening degree of the proportional valve based on the current battery pack inlet water temperature and the current electric heater heating circuit water temperature, so that the current battery pack inlet water temperature is the battery pack target adjusted water temperature;

[0146] Wherein, the proportional valve is used to control the water flow rate in the battery pack heating circuit.

[0147] To further optimize the above embodiments, the heating control device may further include:

[0148] A maximum power judgment unit, configured to judge whether the current power of the electric heater is the maximum power after the control unit controls the current battery pack inlet water temperature to be the battery pack target adjusted water temperature;

[0149] An adjustment unit, configured to, when the maximum power judgment unit determines that it is not, adjust the current power of the electric heater to continue heating the battery pack and make the heating water temperature of the occupant compartment meet the requirements of the occupant compartment target water temperature;

[0150] A difference calculation unit, configured to calculate the current water temperature difference between the current heating water temperature of the occupant compartment and the target water temperature of the occupant compartment when the maximum power judgment unit determines it as "yes".

[0151] A time judgment unit, configured to judge whether the water temperature difference time maintains a second preset time threshold.

[0152] Wherein, the water temperature difference time is: the time when the current water temperature difference is less than the water temperature difference threshold, and the value of the water temperature difference threshold is determined according to actual needs, such as 3°C, and the value of the second preset time threshold is determined according to actual needs, such as 1 min.

[0153] A multiple determination unit, configured to determine the multiple n of the water temperature difference time to the second preset time threshold when the time judgment unit determines it as "yes".

[0154] In this embodiment, n is a natural number obtained by rounding down. For example, 0.8 is taken as 0, and 1.1 is taken as 1.

[0155] A temperature adjustment unit, configured to obtain the target adjusted water temperature of the battery pack based on the multiple.

[0156] The target adjusted water temperature of the battery pack is (m - n * △T), where m is the target water temperature of the battery pack, and the target water temperature of the battery pack is the water temperature carried in the battery pack heating request. For example, 40°C, △T is the water temperature drop amplitude, which is a fixed value, such as 10°C, and the value of the second preset time threshold is determined according to actual needs, such as 1 min.

[0157] For example, when the battery pack first sends a battery pack heating request, the target water temperature of the battery pack carried is 40°C, and △T is 10°C. During the battery pack heating control process, when n changes from 0 to 1, the target adjusted water temperature of the battery pack is (40 - 1 * 10)°C = 30°C. Therefore, the inlet water temperature of the battery pack is reduced to ensure the heating of the occupant compartment and make the energy generated by the electric heater fully utilized.

[0158] When the value of n increases, the corresponding target adjusted water temperature of the battery pack will decrease by a water temperature drop amplitude △T. Compared with the original target water temperature m of the battery pack, the water temperature is reduced by n * △T in total.

[0159] To further optimize the above embodiment, the heating control device may further include:

[0160] A battery pack temperature acquisition unit, configured to acquire the current battery pack temperature after the temperature adjustment unit obtains the target adjusted water temperature of the battery pack based on the multiple.

[0161] A temperature difference value judgment unit, configured to judge whether the temperature difference between the target adjusted water temperature of the battery pack and the current battery pack temperature is greater than a preset temperature difference value.

[0162] A heating stop unit, configured to stop heating the battery pack when the temperature difference value determination unit determines it as "no".

[0163] A water temperature control unit, configured to, when the temperature difference value determination unit determines it as "yes", control the water temperature at the battery pack inlet again by controlling the opening degree of the proportional valve.

[0164] It should be specifically noted that for the specific working principles of the components in the heating control device, please refer to the corresponding parts of the method embodiments, which will not be elaborated here.

[0165] The present invention also discloses a new energy vehicle, which has the above-mentioned heating control device. For the heating control principle of the new energy vehicle, please refer to the corresponding parts of the above-mentioned method embodiments and device embodiments, which will not be elaborated here.

[0166] Finally, it should also be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0167] The various embodiments in this specification are described in a progressive manner, with each embodiment highlighting the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0168] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heating control method for a new energy vehicle, characterized in that, Including: After receiving a battery pack heating request, determine whether a passenger compartment heating request is received; If not, open the battery pack heating circuit and adjust the power of the electric heater to change the water temperature at the battery pack inlet to heat the battery pack alone; If so, open the passenger compartment heating circuit, adjust the power of the electric heater to change the water temperature at the passenger compartment inlet to heat the passenger compartment alone; When the passenger compartment is heated to meet the preset heating condition, adjust the power of the electric heater, and proportionally distribute the heat generated by the electric heater according to the respective heating requirements of the battery pack and the passenger compartment to heat the battery pack and the passenger compartment simultaneously, and make the heating water temperature of the passenger compartment meet the passenger compartment target water temperature requirement; Wherein, after the step of adjusting the power of the electric heater and proportionally adjusting the water temperature at the battery pack inlet and the water temperature at the passenger compartment inlet to heat the battery pack and the passenger compartment simultaneously and make the heating water temperature of the passenger compartment meet the passenger compartment target water temperature requirement, it further includes: Obtain the current water temperature at the battery pack inlet and the current water temperature of the electric heater heating circuit; Based on the current water temperature at the battery pack inlet and the current water temperature of the electric heater heating circuit, control the opening degree of the proportional valve to change the water flow rate in the battery pack heating circuit to make the current water temperature at the battery pack inlet the battery pack target regulated water temperature; Wherein, after the current water temperature at the battery pack inlet is the battery pack target regulated water temperature, it further includes: Judge whether the current power of the electric heater is the maximum power; If not, adjust the current power of the electric heater to continue heating the battery pack and make the heating water temperature of the passenger compartment meet the passenger compartment target water temperature requirement; If so, calculate the current water temperature difference between the current heating water temperature of the passenger compartment and the passenger compartment target water temperature; Judge whether the water temperature difference time maintains a second preset time threshold, wherein the water temperature difference time is: the time when the current water temperature difference is less than the water temperature difference threshold; If so, determine that the water temperature difference time is a multiple n of the second preset time threshold; Based on the multiple n, obtain the battery pack target regulated water temperature as (m - n*△T), where m is the battery pack target water temperature, n is a natural number rounded down, and △T is the water temperature drop amplitude, which is a fixed value.

2. The heating control method according to claim 1, characterized in that, The step of opening the battery pack heating circuit and adjusting the power of the electric heater to change the water temperature at the battery pack inlet to heat the battery pack alone specifically includes: Open the battery pack heating circuit; Obtain the current water temperature at the battery pack inlet fed back by the battery pack; Adjust the power of the electric heater to make the current water temperature at the battery pack inlet reach the battery pack target water temperature.

3. The heating control method according to claim 2, characterized in that, After the step of opening the battery pack heating circuit, it further includes: Obtain the current battery pack temperature; Judge whether the current battery pack temperature reaches the battery pack target temperature; If so, stop heating the battery pack.

4. The heating control method according to claim 3, characterized in that, It further includes: When the current battery pack temperature does not reach the battery pack target temperature, judge whether a passenger compartment heating request is received; If so, stop heating the battery pack and start heating the passenger compartment alone.

5. The heating control method according to claim 1, characterized in that, The preset heating condition includes: the individual heating time of the occupant compartment exceeds a first preset time threshold, or the difference between the individual heating temperature of the occupant compartment and the set temperature satisfies a preset difference range.

6. The heating control method according to claim 1, characterized in that, After obtaining the target adjusted water temperature of the battery pack, it further includes: Obtaining the current temperature of the battery pack; Judging whether the temperature difference between the target adjusted water temperature of the battery pack and the current temperature of the battery pack is greater than a preset temperature difference value; If not, stop heating the battery pack; If so, execute again the step of controlling the opening of the proportional valve based on the current water temperature at the inlet of the battery pack and the current water temperature of the electric heater heating circuit, changing the water flow rate in the battery pack heating circuit, so that the current water temperature at the inlet of the battery pack is the target adjusted water temperature of the battery pack.

7. A heating control device for a new energy vehicle, characterized in that, It includes: A judging unit, configured to judge whether an occupant compartment heating request is received when a battery pack heating request is received; A battery pack individual heating unit, configured to open the battery pack heating circuit and adjust the power of the electric heater to change the water temperature at the inlet of the battery pack to individually heat the battery pack when the judging unit judges no; An occupant compartment individual heating unit, configured to open the occupant compartment heating circuit and adjust the power of the electric heater to change the water temperature at the inlet of the occupant compartment to individually heat the occupant compartment when the judging unit judges yes; A simultaneous heating unit, configured to adjust the power of the electric heater and proportionally distribute the heat generated by the electric heater according to the respective heating requirements of the battery pack and the occupant compartment when the occupant compartment is heated to meet the preset heating condition, so as to simultaneously heat the battery pack and the occupant compartment and make the heating water temperature of the occupant compartment meet the requirement of the target water temperature of the occupant compartment; Wherein, after the step of adjusting the power of the electric heater and proportionally adjusting the water temperature at the inlet of the battery pack and the water temperature at the inlet of the occupant compartment to simultaneously heat the battery pack and the occupant compartment and make the heating water temperature of the occupant compartment meet the requirement of the target water temperature of the occupant compartment, the device is further configured to: Obtain the current water temperature at the inlet of the battery pack and the current water temperature of the electric heater heating circuit; Based on the current water temperature at the inlet of the battery pack and the current water temperature of the electric heater heating circuit, control the opening of the proportional valve, change the water flow rate in the battery pack heating circuit, so that the current water temperature at the inlet of the battery pack is the target adjusted water temperature of the battery pack; Wherein, after the current water temperature at the inlet of the battery pack is the target adjusted water temperature of the battery pack, the device is further configured to: Judge whether the current power of the electric heater is the maximum power; If not, adjust the current power of the electric heater to continue heating the battery pack and make the heating water temperature of the occupant compartment meet the requirement of the target water temperature of the occupant compartment; If so, calculate the current water temperature difference between the current heating water temperature of the occupant compartment and the target water temperature of the occupant compartment; Judge whether the water temperature difference time maintains a second preset time threshold, wherein the water temperature difference time is: the time when the current water temperature difference is less than the water temperature difference threshold; If so, determine that the water temperature difference time is a multiple n of the second preset time threshold; Based on the multiple n, the target regulated water temperature of the battery pack is obtained as (m - n * △T), where m is the target water temperature of the battery pack, n is a natural number obtained by rounding down, and △T is the water temperature drop amplitude, which is a fixed value.

8. A new energy vehicle, characterized in that, Including the heating control device of the new energy vehicle according to claim 7.

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