A control method for a vehicle-pack integrated battery dual thermal management system

Abstract

The present invention discloses a control method for a vehicle-integrated dual thermal management system for batteries, which relates to the technical field of electric buses. The control method includes the following steps: obtaining the battery temperature T0 and the ambient temperature T in the battery compartment; determining whether to activate the cooling mode of the battery water cooling system and the battery air cooling system by judging whether the battery temperature T0 is greater than a preset temperature T1 and whether the ambient temperature T is greater than a preset temperature T3; and determining whether to activate the heating mode of the battery water cooling system and the battery air cooling system by judging whether the battery temperature T0 is less than a preset temperature T2 and whether the ambient temperature T is less than a preset temperature T4. The present invention adopts a combination of a battery air cooling system and a battery water cooling system to achieve battery thermal management control. The simultaneous operation of the dual thermal management systems can effectively improve thermal management efficiency, ensure that the battery temperature and the ambient temperature and humidity in the battery compartment are controlled within a preferred range, thereby allowing the battery to operate in an optimal environment and extending battery life.

Description

Technical Field

[0001] The present invention relates to the technical field of electric buses, and in particular to a control method for a vehicle-package integrated battery dual thermal management system. Background Art

[0002] Electric bus power batteries can be broadly categorized as top-mounted, rear-mounted, or bottom-mounted, depending on their placement. Top-mounted batteries are placed on the bus's roof. Existing technology typically treats the assembled battery pack as a separate component, directly attaching it to the bus's roof via mounting brackets. This placement suffers from low integration and a large footprint, preventing full utilization of the roof's space and limiting the number of battery packs it can accommodate.

[0003] MTV technology (Module to Vehicle) involves installing a battery compartment on the roof of a bus, using the roof as the housing for the battery pack, and placing the battery modules directly within the compartment. This overcomes the shortcomings of existing technologies and achieves a high degree of integration between the battery pack and the roof. Existing air-cooling technology for power batteries primarily involves adding additional facilities such as electromagnetic fans to accelerate air flow in the battery pack area, thereby cooling the batteries. However, after integration using MTV technology, the space within the battery compartment on the roof is limited, making it impossible to accommodate the placement of facilities such as electromagnetic fans. Furthermore, this air-cooling technology suffers from poor integration and low cooling efficiency, leaving significant room for improvement.

[0004] Based on this, we provide a control method for a vehicle-pack integrated battery dual thermal management system. Summary of the Invention

[0005] The present invention provides a control method for a vehicle-pack integrated battery dual thermal management system, the main purpose of which is to solve the problems existing in the prior art.

[0006] The present invention adopts the following technical solutions:

[0007] A battery dual thermal management system based on vehicle-package integration, the battery dual thermal management system comprising an air conditioning compartment and a battery compartment independently arranged on the roof of a bus, and an air duct arranged on the roof of the bus, the air duct being interconnected with the passenger compartment and the battery compartment; an air conditioning assembly with a refrigerant circuit is provided in the air conditioning compartment; the battery compartment is provided with a plurality of battery modules arranged at intervals from each other, and a water cooling circuit with a water cooling plate group, the water cooling circuit exchanging heat with the refrigerant circuit through a heat exchange plate, thereby forming a battery water cooling system; the battery compartment is provided with an air inlet connected to the air duct and an air outlet connected to the outside of the vehicle, thereby forming a battery air cooling system with the air conditioning assembly and the air duct; the control method comprises the following steps:

[0008] (1) Obtain the battery temperature T0 and the ambient temperature T inside the battery compartment;

[0009] (2) By judging whether the battery temperature T0 is greater than the preset temperature T1 and whether the ambient temperature T is greater than the preset temperature T3, it is determined whether to start the cooling mode of the battery water cooling system and the battery air cooling system;

[0010] (2.1) First, determine whether the battery temperature T0 is greater than the preset temperature T1. If so, activate the cooling mode of the battery water cooling system to cool the battery module. Then, determine whether the ambient temperature T is greater than the preset temperature T3 and whether the air conditioning component is in cooling mode. If both are true, activate the cooling mode of the battery air cooling system to cool the environment inside the battery compartment.

[0011] (2.2) When the ambient temperature T is not greater than the preset temperature T3, the cooling mode of the battery air cooling system is turned off; when the battery temperature T0 is not greater than the preset temperature T1, the cooling mode of the battery water cooling system is turned off;

[0012] (3) By judging whether the battery temperature T0 is less than the preset temperature T2 and whether the ambient temperature T is less than the preset temperature T4, it is determined whether to start the heating mode of the battery water cooling system and the battery air cooling system;

[0013] (3.1) First, determine whether the battery temperature T0 is less than the preset temperature T2. If so, activate the heating mode of the battery water cooling system to heat the battery module. Then, determine whether the ambient temperature T is less than the preset temperature T4 and whether the air conditioning component is in heating mode. If both are true, activate the heating mode of the battery air cooling system to heat the environment inside the battery compartment.

[0014] (3.2) When the ambient temperature T is not less than the preset temperature T4, the heating mode of the battery air cooling system is turned off; when the battery temperature T0 is not less than the preset temperature T2, the heating mode of the battery water cooling system is turned off.

[0015] Furthermore, a first one-way valve is provided at the air inlet, a second one-way valve is provided at the air outlet, and an exhaust fan is provided outside the air outlet; the air conditioning component, the air duct, the first one-way valve, the second one-way valve and the exhaust fan constitute a battery air cooling system.

[0016] Furthermore, the battery dual thermal management system also includes a dryer arranged outside the air inlet; the air duct, the dryer, the first one-way valve, the second one-way valve and the exhaust fan constitute a battery compartment ventilation system; in steps (2) and (3), when the battery air cooling system is not turned on, if the ambient humidity Y in the battery compartment is greater than the set humidity Y1, the battery compartment ventilation system is turned on to ventilate the battery compartment alone.

[0017] Furthermore, in steps (2.2) and (3.2), the ambient humidity Y is monitored in real time, and when the ambient humidity Y is no greater than the set humidity Y1, it is determined whether to shut down the battery air cooling system.

[0018] Furthermore, the battery dual thermal management system also includes a first humidity sensor and a second humidity sensor, the first humidity sensor is arranged next to the air inlet in the battery compartment; the second humidity sensor is arranged next to the air outlet in the battery compartment; the humidity values ​​of the first humidity sensor and the second humidity sensor are obtained at the same time, and the maximum value of the two is taken as the ambient humidity Y in the battery compartment.

[0019] Furthermore, in steps (2.2) and (3.2), when the battery air cooling system continuously operates for more than a preset time Z1, if the humidity value Y0 of the first humidity sensor exceeds the preset humidity value Y2, the vehicle instrument panel will alert the dryer of an abnormality and determine whether to shut down the battery air cooling system. Otherwise, the battery air cooling system will be determined when the ambient humidity Y is no greater than the set humidity Y1.

[0020] Furthermore, when the battery compartment ventilation system continuously works for more than the preset time Z1, if the humidity value Y0 of the first humidity sensor exceeds the preset humidity value Y2, the vehicle instrument will remind the dryer of the abnormality and shut down the battery compartment ventilation system. Otherwise, the battery compartment ventilation system will be shut down when the ambient humidity Y is no greater than the set humidity Y1.

[0021] Furthermore, the battery dual thermal management system also includes a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged next to the air inlet in the battery compartment; the second temperature sensor is arranged next to the air outlet in the battery compartment; the temperature values ​​of the first temperature sensor and the second temperature sensor are obtained at the same time, and the average value of the two is taken as the ambient temperature T in the battery compartment.

[0022] Furthermore, the refrigerant circuit includes a condenser and a compressor connected to each other; the water cooling circuit includes the water cooling plate group, water pump and PTC heater connected to each other, and the water cooling circuit and the refrigerant circuit perform heat exchange in parallel through the heat exchange plate.

[0023] Furthermore, the water-cooling plate group includes a plurality of interconnected water-cooling plates; each battery module is provided with one water-cooling plate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention adopts a combination of a battery air cooling system and a battery water cooling system to achieve battery thermal management control. The simultaneous operation of the dual thermal management systems can effectively improve the thermal management efficiency, ensuring that the battery temperature and the ambient temperature and humidity in the battery compartment are controlled within a better range, thereby allowing the battery to work in an optimal environment and extending the battery life.

[0026] 2. When the battery air cooling system of the present invention is in operation, the cold or hot air generated by the air conditioning assembly diffuses into the passenger compartment through the air duct, enters the battery compartment through the air inlet of the air duct, thereby cooling or heating the battery compartment, and is finally discharged to the outside of the vehicle through the air outlet, thereby effectively regulating the ambient temperature of the battery compartment. As can be seen, the battery air cooling system of the present invention has a simple structure and ingenious design, overcoming the shortcomings of the prior art that require additional equipment such as electromagnetic fans.

[0027] 3. The battery air cooling system of the present invention not only effectively regulates the ambient temperature of the battery compartment, but also reduces the ambient humidity within the battery compartment, preventing condensation and potentially causing insulation problems. Furthermore, when the battery air cooling system is not operating, the battery compartment ventilation system can be controlled to operate independently, thereby regulating the ambient humidity within the battery compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the bus roof in the present invention.

[0029] Figure 2 It is the overall structural diagram of the present invention.

[0030] Figure 3 Schematic diagram of the control flow of the present invention.

[0031] In the figure: 1. Battery compartment; 10. Battery module; 11. First one-way valve; 12. Second one-way valve; 13. Exhaust fan; 14. Dryer; 15. Water cooling circuit; 151. Water cooling plate; 152. Water pump; 153. PTC heater; 154. Heat exchange plate; 16. First humidity sensor; 17. Second humidity sensor; 18. First temperature sensor; 19. Second temperature sensor; 2. Air conditioning compartment; 21. Refrigerant circuit; 211. Condenser; 212. Compressor; 22. Evaporator; 3. Air duct; 4. Vehicle control module. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention are described below with reference to the accompanying drawings. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details.

[0033] Reference Figure 1 and Figure 2The present invention discloses a vehicle-package integrated dual-battery thermal management system, comprising an air conditioning compartment 2 and a battery compartment 1 independently arranged on the roof of a bus, and an air duct 3 arranged on the roof of the bus, the air duct 3 being interconnected with the passenger compartment and the air conditioning compartment 2; an air conditioning assembly with a refrigerant circuit 21 is provided in the air conditioning compartment 2; the battery compartment 1 is provided with an air inlet connected to the air duct 3 and an air outlet connected to the outside of the vehicle, thereby forming a battery air cooling system with the air conditioning assembly and the air duct 3. When the battery air cooling system is in operation, the cold or hot air prepared by the air conditioning assembly diffuses into the passenger compartment through the air duct and enters the battery compartment 1 from the air inlet, thereby cooling or heating the battery compartment 1, and is finally discharged to the outside of the vehicle through the air outlet.

[0034] Reference Figure 1 and Figure 2 , a first one-way valve 11 and a second one-way valve 12 are respectively provided at the air inlet and the air outlet, and an exhaust fan 13 is provided outside the air outlet. When the exhaust fan 13 is working, a negative pressure is formed in the battery compartment 1, so that the gas in the air duct 3 can enter the battery compartment 1 from the air inlet and be discharged to the outside of the vehicle from the air outlet. The setting of the first one-way valve 11 can prevent the gas in the battery compartment 1 from being discharged into the air duct 3, and the setting of the second one-way valve 12 can prevent the gas outside the vehicle from being discharged into the battery compartment 1, thereby ensuring the one-way flow of the battery air cooling system. It can be seen that the air conditioning component, the air duct 3, the first one-way valve 11, the second one-way valve 12 and the exhaust fan 13 constitute a more complete and reliable battery air cooling system.

[0035] Reference Figure 1 and Figure 2 Battery compartment 1 is equipped with a water-cooling circuit 15 with a water-cooling plate assembly. This circuit exchanges heat with refrigerant circuit 21 via heat exchanger plate 154, forming a battery water-cooling system. During operation, refrigerant circuit 21 cools or heats the refrigerant medium and then exchanges heat with the high- or low-temperature coolant in the water-cooling circuit 15 via heat exchanger plate 154, thereby cooling or heating the coolant.

[0036] Reference Figure 1 and Figure 2Specifically, the refrigerant circuit 21 includes a condenser 211 and a compressor 212 that are interconnected; the water-cooling circuit 15 includes a water-cooling plate group, a water pump 152 and a PTC heater 153 that are interconnected, and the water-cooling circuit 15 and the refrigerant circuit 21 are heat-exchanged in parallel through a heat exchange plate 154. The water-cooling plate group includes a number of water-cooling plates 151 that are interconnected; a number of battery modules 10 that are spaced apart from each other are provided in the battery compartment 1, and each battery module 10 is provided with a water-cooling plate 151, thereby ensuring that the battery water cooling system can evenly cool each water-cooling plate 151. In addition, the air-conditioning component also includes an evaporator 22 connected in parallel to the refrigerant circuit 21. The working principles of components such as the evaporator 22, the condenser 211 and the compressor 212 belong to the existing technology and will not be elaborated here.

[0037] Reference Figure 1 and Figure 2 The battery dual thermal management system also includes a dryer 14 arranged outside the air inlet; the air duct 3, the dryer 14, the first one-way valve 11, the second one-way valve 12 and the exhaust fan 13 constitute the battery compartment ventilation system. After the battery compartment 1 is integrated into the top cover, condensation is likely to occur in the battery compartment 1, thereby causing insulation problems. This is because: on the one hand, the space of the integrated battery compartment 1 is greatly increased, and there is more gas in the compartment. Therefore, when the temperature difference between the inside and outside is large, condensation is likely to occur in the battery compartment 1; on the other hand, after integration, the water-cooling plates 151 of each battery module 10 are all arranged in the battery compartment 1, which will increase the temperature difference between the inside and outside of the compartment, making condensation more likely to occur. Based on this, setting a dryer 14 at the air inlet of the air duct can dry the gas in the air duct 3, thereby injecting dry gas into the battery compartment 1 and allowing the moist gas to be discharged from the air outlet in time. When the battery air cooling system is operating, air from the air conditioning compartment 2, heated or cooled by the air conditioning components, enters the air duct 3, is dried by the dryer 14, and then enters the battery compartment 1, thereby achieving ventilation for the battery compartment 1 while simultaneously managing heat. When the battery air cooling system is disabled, the battery compartment ventilation system operates independently, and air from the passenger compartment enters the air duct 3, is dried by the dryer, and then enters the battery compartment 1, thereby achieving ventilation for the battery compartment 1.

[0038] Reference Figure 1 and Figure 2The battery dual management system also includes a first humidity sensor 16 and a second humidity sensor 17. The first humidity sensor 16 is arranged next to the air inlet in the battery compartment; the second humidity sensor 17 is arranged next to the air outlet in the battery compartment. In this embodiment, the first humidity sensor 16 and the second humidity sensor 17 are used to simultaneously detect the ambient humidity in the battery compartment. When judging the ambient humidity in the compartment, the humidity values ​​of the first humidity sensor 16 and the second humidity sensor 17 are obtained at the same time, and the maximum value of the two is taken as the ambient humidity Y in the battery compartment, thereby ensuring that the air humidity in each area of ​​the battery compartment meets safety requirements. In addition, the first humidity sensor 16 located next to the air inlet can also be used to detect whether the drying performance of the dryer 14 is normal, thereby preventing abnormal ventilation effect of the battery compartment 1 due to dryer failure. Preferably, in this embodiment, the dryer 14 includes a container and a desiccant installed in the container. When abnormal drying performance is detected, the abnormality can be quickly handled by replacing the desiccant, thereby improving work efficiency.

[0039] Reference Figure 1 and Figure 2 The battery dual thermal management system also includes a first temperature sensor 18 and a second temperature sensor 19. The first temperature sensor 18 is located near the air inlet in the battery compartment, and the second temperature sensor 19 is located near the air outlet in the battery compartment. In this embodiment, the first temperature sensor 18 and the second temperature sensor 19 are used to simultaneously detect the ambient temperature within the battery compartment. When determining the ambient temperature within the compartment, the temperature values ​​of the first temperature sensor 18 and the second temperature sensor 19 are simultaneously obtained, and the average of the two values ​​is taken as the ambient temperature T within the battery compartment, thereby ensuring that the obtained ambient temperature within the battery compartment is more accurate and reliable.

[0040] Reference Figure 1 and Figure 2 The battery dual thermal management system also includes a vehicle control module 4, which is connected to a first temperature sensor 16, a second temperature sensor 17, a first humidity sensor 18, and a second humidity sensor 19 to promptly obtain the ambient humidity Y and ambient temperature T within the battery compartment. The vehicle control module 4 is also connected to an exhaust fan 13, thereby controlling the opening or closing of the battery cooling system or the battery compartment exhaust system. Furthermore, the vehicle control module is interconnected with the battery BMS system to obtain the temperature of each battery module 10 and take the average temperature of each battery module 10 as the battery temperature T0.

[0041] Reference Figures 1 to 3 In order to more clearly introduce the above-mentioned battery dual thermal management system, the specific control method of this embodiment is introduced in detail below, which includes the following control steps:

[0042] (1) Obtain the battery temperature T0 and the ambient temperature T inside the battery compartment;

[0043] (2) By judging whether the battery temperature T0 is greater than the preset temperature T1 and whether the ambient temperature T is greater than the preset temperature T3, it is determined whether to start the cooling mode of the battery water cooling system and the battery air cooling system;

[0044] (2.1) First, determine whether the battery temperature T0 is greater than the preset temperature T1. If so, activate the cooling mode of the battery water cooling system to cool the battery module. Then, determine whether the ambient temperature T is greater than the preset temperature T3 and whether the air conditioning component is in cooling mode. If both are true, activate the cooling mode of the battery air cooling system to cool the environment inside the battery compartment.

[0045] (2.2) When the ambient temperature T is not greater than the preset temperature T3, the cooling mode of the battery air cooling system is turned off; when the battery temperature T0 is not greater than the preset temperature T1, the cooling mode of the battery water cooling system is turned off;

[0046] (3) By judging whether the battery temperature T0 is less than the preset temperature T2 and whether the ambient temperature T is less than the preset temperature T4, it is determined whether to start the heating mode of the battery water cooling system and the battery air cooling system;

[0047] (3.1) First, determine whether the battery temperature T0 is less than the preset temperature T2. If so, activate the heating mode of the battery water cooling system to heat the battery module. Then, determine whether the ambient temperature T is less than the preset temperature T4 and whether the air conditioning component is in heating mode. If both are true, activate the heating mode of the battery air cooling system to heat the environment inside the battery compartment.

[0048] (3.2) When the ambient temperature T is not less than the preset temperature T4, the heating mode of the battery air cooling system is turned off; when the battery temperature T0 is not less than the preset temperature T2, the heating mode of the battery water cooling system is turned off.

[0049] Reference Figures 1 to 3 In steps (2) and (3), when the battery air cooling system is not turned on, if the ambient humidity Y in the battery compartment is greater than the set humidity Y1, the battery compartment ventilation system is turned on to ventilate the battery compartment separately. When the battery compartment ventilation system continuously operates for more than the preset time Z1, if the humidity value Y0 of the first humidity sensor exceeds the preset humidity value Y2, the vehicle instrument will remind the dryer of abnormality and shut down the battery compartment ventilation system. Otherwise, wait until the ambient humidity Y is no greater than the set humidity Y1 before shutting down the battery compartment ventilation system.

[0050] Reference Figures 1 to 3 In steps (2.2) and (3.2), the ambient humidity Y is monitored in real time. When the ambient humidity Y is no greater than the set humidity Y1, it is determined whether to shut down the battery cooling system.

[0051] Reference Figures 1 to 3 In steps (2.2) and (3.2), when the battery air cooling system continuously operates for more than the preset time Z1, if the humidity value Y0 of the first humidity sensor exceeds the preset humidity value Y2, the vehicle instrument will remind the dryer of abnormality and determine whether to shut down the battery air cooling system. Otherwise, wait until the ambient humidity Y is no greater than the set humidity Y1 before determining whether to shut down the battery air cooling system.

[0052] In summary, when the vehicle's power battery reaches a high or low temperature due to high-rate charge and discharge, the battery water cooling system and the battery air cooling system can be controlled to jointly start cooling or heating mode to improve thermal management. When the vehicle is operating at low speed or other power battery low-rate charge and discharge conditions, the battery air cooling system, battery water cooling system, or battery compartment battery swapping system can be controlled to operate independently to meet battery thermal management requirements.

[0053] Reference Figure 3 The following describes the specific working process of the above-mentioned battery dual thermal management system:

[0054] Step S1: Start, the vehicle is powered on for self-test, and the vehicle control module obtains the battery temperature T0, the ambient temperature T of the battery compartment, and the ambient humidity Y.

[0055] Step S2: The vehicle control module determines whether the battery temperature T0 is greater than the preset temperature T1. If so, step S3 is executed; otherwise, step S13 is executed.

[0056] Step S3: Turn on the cooling mode of the battery water cooling system to cool the battery module in the battery compartment, and execute step S4.

[0057] Step S4: The vehicle control module determines whether the ambient temperature T in the battery compartment is greater than T3 and whether the air conditioning component is turned on the cooling mode. If both are true, step S5 is executed; otherwise, step S24 is executed.

[0058] Step S5: The vehicle control module controls the exhaust fan to operate, thereby starting the cooling mode of the battery air cooling system. At the same time, the vehicle control module records the operating time of the exhaust fan and executes step S6.

[0059] Step S6: After the exhaust fan's working time exceeds the set time Z1, the vehicle control module determines whether the humidity value Y0 of the first humidity sensor is not greater than the preset humidity Y2. If so, execute step S8; otherwise, execute step S7.

[0060] Step S7: The vehicle instrument panel reminds the user that the desiccant function has failed, reminds the user to replace it, and then executes step S9.

[0061] Step S8: The vehicle control function determines whether the ambient humidity Y in the battery compartment is not greater than Y1. If so, step S9 is executed. Otherwise, it is determined whether it has timed out. If so, timeout processing is performed. Otherwise, this step is repeated.

[0062] Step S9: The vehicle control module determines whether the ambient temperature T of the battery compartment is not greater than T3. If so, step S10 is executed; otherwise, this step is repeated.

[0063] Step S10: The vehicle control module turns off the exhaust fan, thereby turning off the cooling mode of the battery air cooling system, and executing step S11.

[0064] Step S11: The vehicle control module determines whether the battery temperature T0 is not greater than the preset temperature T1. If so, step S12 is executed; otherwise, this step is repeated.

[0065] Step S12: Turn off the cooling mode of the battery water cooling system, and the control process ends.

[0066] Step S13: The vehicle control module determines whether the battery temperature T0 is lower than the preset temperature T2. If so, step S14 is executed; otherwise, step S24 is executed.

[0067] Step S14: Turn on the heating mode of the battery water cooling system to heat the battery module in the battery compartment, and execute step 15.

[0068] Step S15: The vehicle control module determines whether the ambient temperature T in the battery compartment is less than T4 and whether the air conditioning component is turned on the heating mode. If both are true, step S16 is executed; otherwise, step S24 is executed.

[0069] Step S16: The vehicle control module controls the exhaust fan to turn on, thereby turning on the heating mode of the battery air cooling system. At the same time, the vehicle control module records the working time of the exhaust fan and executes step S17.

[0070] Step S17: After the exhaust fan's working time exceeds the set time Z1, the vehicle control module determines whether the humidity value Y0 of the first humidity sensor is not greater than the preset humidity Y2. If so, step S19 is executed; otherwise, step S18 is executed.

[0071] Step S18: The vehicle instrument panel notifies the user that the desiccant function has failed, reminding the user to replace it, and then executing step S20.

[0072] Step S19: The vehicle control module determines whether the ambient humidity Y in the battery compartment is not greater than Y1. If so, step S20 is executed. Otherwise, it is determined whether it has timed out. If so, timeout processing is performed. Otherwise, this step is repeated.

[0073] Step S20: The vehicle control module determines whether the ambient temperature T of the battery compartment is not less than T4. If so, step S21 is executed; otherwise, this step is repeated.

[0074] Step S21: The vehicle control module turns off the exhaust fan, thereby turning off the heating mode of the battery cooling system, and executes step S22.

[0075] Step S22: The vehicle control module determines whether the battery temperature T0 is not less than the preset temperature T2. If so, step S23 is executed; otherwise, this step is repeated.

[0076] Step S23: Turn off the heating mode of the battery water cooling system, and the control process ends.

[0077] Step S24: The vehicle control module determines whether the ambient humidity Y in the battery compartment is greater than a preset humidity value Y1. If so, step S25 is executed; otherwise, step S30 is executed.

[0078] Step S25: The vehicle control module controls the exhaust fan to operate, thereby turning on the battery compartment ventilation system. At the same time, the vehicle control module records the working time of the exhaust fan and executes step S26.

[0079] Step S26: After the exhaust fan's working time exceeds the set time Z1, the vehicle control module determines whether the humidity value Y0 of the first humidity sensor is not greater than the preset humidity Y2. If so, step S28 is executed; otherwise, step S27 is executed.

[0080] Step S27: The vehicle instrument panel notifies the user that the desiccant function has failed, reminding the user to replace it, and then executing step S30.

[0081] Step S28: The vehicle control function determines whether the ambient humidity Y in the battery compartment is not greater than Y1. If so, step S29 is executed. Otherwise, it is determined whether it has timed out. If so, timeout processing is performed. Otherwise, this step is repeated.

[0082] Step S29: The vehicle control module turns off the exhaust fan, thereby turning off the battery compartment ventilation system, and executes step S30.

[0083] Step S30: Determine whether the cooling mode of the battery water cooling system is previously turned on. If so, execute step S11; otherwise, execute step S31.

[0084] Step S31: Determine whether the heating mode of the battery water cooling system is previously turned on. If so, execute step S22; otherwise, the control process ends.

[0085] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A control method for a dual thermal management system for batteries based on vehicle-pack integration, characterized by: The battery dual thermal management system includes an air conditioning compartment and a battery compartment independently arranged on the bus roof, and an air duct arranged on the bus roof, the air duct being interconnected with the passenger compartment and the battery compartment; an air conditioning assembly with a refrigerant circuit is provided in the air conditioning compartment; a plurality of battery modules arranged at intervals from each other are provided in the battery compartment, and a water cooling circuit with a water cooling plate group is provided, the water cooling circuit exchanges heat with the refrigerant circuit through a heat exchange plate, thereby forming a battery water cooling system; the battery compartment is provided with an air inlet connected to the air duct and an air outlet connected to the outside of the vehicle, thereby forming a battery air cooling system with the air conditioning assembly and the air duct; the control method includes the following steps: (1) Obtain the battery temperature T0 and the ambient temperature T inside the battery compartment; (2) By judging whether the battery temperature T0 is greater than the preset temperature T1 and whether the ambient temperature T is greater than the preset temperature T3, it is determined whether to start the cooling mode of the battery water cooling system and the battery air cooling system; (2.1) First, determine whether the battery temperature T0 is greater than the preset temperature T1. If so, activate the cooling mode of the battery water cooling system to cool the battery module. Then, determine whether the ambient temperature T is greater than the preset temperature T3 and whether the air conditioning component is in cooling mode. If both are true, activate the cooling mode of the battery air cooling system to cool the environment inside the battery compartment. (2.2) When the ambient temperature T is not greater than the preset temperature T3, the cooling mode of the battery air cooling system is turned off; when the battery temperature T0 is not greater than the preset temperature T1, the cooling mode of the battery water cooling system is turned off; (3) By judging whether the battery temperature T0 is less than the preset temperature T2 and whether the ambient temperature T is less than the preset temperature T4, it is determined whether to start the heating mode of the battery water cooling system and the battery air cooling system; (3.1) First, determine whether the battery temperature T0 is less than the preset temperature T2. If so, activate the heating mode of the battery water cooling system to heat the battery module. Then, determine whether the ambient temperature T is less than the preset temperature T4 and whether the air conditioning component is in heating mode. If both are true, activate the heating mode of the battery air cooling system to heat the environment inside the battery compartment. (3.2) When the ambient temperature T is not less than the preset temperature T4, the heating mode of the battery air cooling system is turned off; when the battery temperature T0 is not less than the preset temperature T2, the heating mode of the battery water cooling system is turned off; A first one-way valve is provided at the air inlet, a second one-way valve is provided at the air outlet, and an exhaust fan is provided outside the air outlet; the air conditioning component, the air duct, the first one-way valve, the second one-way valve and the exhaust fan constitute a battery air cooling system; the battery dual thermal management system also includes a dryer provided outside the air inlet; the air duct, the dryer, the first one-way valve, the second one-way valve and the exhaust fan constitute a battery compartment ventilation system; in steps (2) and (3), when the battery air cooling system is not turned on, if the ambient humidity Y in the battery compartment is greater than the set humidity Y1, the battery compartment ventilation system is turned on to ventilate the battery compartment separately.

2. The control method of the vehicle-pack integrated battery dual thermal management system according to claim 1, characterized in that: In steps (2.2) and (3.2), the ambient humidity Y is monitored in real time. When the ambient humidity Y is no greater than the set humidity Y1, it is determined whether to shut down the battery cooling system.

3. The control method of the vehicle-pack integrated battery dual thermal management system according to claim 2, characterized in that: The battery dual thermal management system also includes a first humidity sensor and a second humidity sensor. The first humidity sensor is arranged next to the air inlet in the battery compartment; the second humidity sensor is arranged next to the air outlet in the battery compartment; the humidity values ​​of the first humidity sensor and the second humidity sensor are obtained at the same time, and the maximum value of the two is taken as the ambient humidity Y in the battery compartment.

4. The control method of the vehicle-pack integrated battery dual thermal management system according to claim 3, characterized in that: In steps (2.2) and (3.2), when the battery air cooling system continuously operates for more than the preset time Z1, if the humidity value Y0 of the first humidity sensor exceeds the preset humidity value Y2, the vehicle instrument panel will alert the dryer of the abnormality and determine whether to shut down the battery air cooling system. Otherwise, the battery air cooling system will be determined when the ambient humidity Y is no greater than the set humidity Y1.

5. The control method of the vehicle-pack integrated battery dual thermal management system according to claim 4, characterized in that: When the battery compartment ventilation system continuously works for more than the preset time Z1, if the humidity value Y0 of the first humidity sensor exceeds the preset humidity value Y2, the vehicle instrument will remind the dryer of the abnormality and shut down the battery compartment ventilation system. Otherwise, wait until the ambient humidity Y is no greater than the set humidity Y1 before shutting down the battery compartment ventilation system.

6. The control method of the battery dual thermal management system based on vehicle-pack integration according to claim 1, characterized in that: The battery dual thermal management system also includes a first temperature sensor and a second temperature sensor. The first temperature sensor is arranged next to the air inlet in the battery compartment; the second temperature sensor is arranged next to the air outlet in the battery compartment; the temperature values ​​of the first temperature sensor and the second temperature sensor are obtained at the same time, and the average value of the two is taken as the ambient temperature T in the battery compartment.

7. The control method of the vehicle-pack integrated battery dual thermal management system according to claim 1, characterized in that: The refrigerant circuit includes a condenser and a compressor connected to each other; the water cooling circuit includes the water cooling plate group, the water pump and the PTC heater connected to each other, and the water cooling circuit and the refrigerant circuit are heat exchanged in parallel through the heat exchange plate.

8. The control method of the vehicle-pack integrated battery dual thermal management system according to claim 1, characterized in that: The water-cooling plate group includes a plurality of interconnected water-cooling plates; each battery module is provided with a water-cooling plate.

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