Battery thermal management system, control method and vehicle

Abstract

This disclosure provides a battery thermal management system, control method, and vehicle, relating to the field of battery thermal management technology. The battery thermal management system includes a battery circulation loop and a cooling circulation loop. The battery circulation loop includes a power battery, a heater, a water pump, a battery cooler, a radiator, and a three-way solenoid valve. One end of the power battery is sequentially connected to the heater and the water pump. The battery cooler and the radiator are connected in parallel, with one end connected to the water pump and the other end connected to two ports of the three-way solenoid valve. The last port of the three-way solenoid valve is connected to the other end of the power battery. The cooling circulation loop includes a compressor, a condenser, an evaporator, a shut-off valve, and a coupling bypass. The compressor, evaporator, shut-off valve, and condenser are sequentially and cyclically connected. The upper coupling bypass is connected in parallel across the two ends of the evaporator and flows through the battery cooler. This disclosure enables the power battery to maintain its optimal operating range, achieve optimal performance, and ensure the vehicle's range, safety, and thermal balance.

Description

Technical Field

[0001] This disclosure relates to the field of battery thermal management technology, and in particular to a battery thermal management system, control method, and vehicle. Background Technology

[0002] Electric vehicle thermal management is mainly divided into three parts: electric drive system thermal management, battery thermal management, and air conditioning system thermal management. Among them, power battery thermal management is the core part of electric vehicle thermal management.

[0003] With the gradual increase in battery energy density, the reduction in fast charging time, and the improvement in user experience, the demand for thermal management is gradually increasing. It is necessary to achieve heating and heat dissipation functions through the thermal management of the power battery system to ensure that the power battery always operates in the optimal temperature range to achieve optimal performance and to ensure the thermal balance of the temperature field of the whole vehicle, thereby eliminating the potential risk of thermal runaway.

[0004] However, the control precision of battery thermal management in related technologies is insufficient, making it impossible to make reasonable analysis and control of the thermal management system of the power battery, resulting in a reduction in the overall performance of the power battery. Summary of the Invention

[0005] This disclosure provides a battery thermal management system, control method, and vehicle, which can solve the problem of insufficient battery management control precision leading to a reduction in the overall performance of the power battery.

[0006] The technical solution is as follows:

[0007] On the one hand, a battery thermal management system is provided, the battery thermal management system comprising: a battery circulation loop and a cooling circulation loop;

[0008] The battery circulation loop includes a power battery, a heater, a water pump, a battery cooler, a radiator, and a three-way solenoid valve.

[0009] One end of the power battery is connected to the heater and the water pump in sequence. The battery cooler and the radiator are connected in parallel, and one end is connected to the water pump. The other end is connected to two ports of the three-way solenoid valve. The last port of the three-way solenoid valve is connected to the other end of the power battery.

[0010] The cooling cycle circuit includes a compressor, a condenser, an evaporator, a shut-off valve, and a coupling bypass;

[0011] The compressor, the evaporator, the shut-off valve, and the condenser are connected in a cyclical manner in sequence, and the above-mentioned coupling bypass is connected in parallel at both ends of the evaporator and flows through the battery cooler.

[0012] In some embodiments, the coupling bypass is provided with a bypass solenoid valve, which is used to control the on / off state of the coupling bypass.

[0013] In some embodiments, the battery circulation loop further includes a fan device and a water storage device, wherein the fan device is located on one side of the radiator and is used to drive airflow through the radiator;

[0014] The water storage device is used to store the heat exchange medium in the battery circulation loop.

[0015] In some embodiments, the battery thermal management system further includes a temperature sensor;

[0016] The temperature sensor is located inside the power battery and is used to detect the internal temperature T0 of the power battery.

[0017] On the other hand, a control method for the battery thermal management system described in this disclosure is provided, the control method comprising:

[0018] Obtain the operating parameters of the power battery, including the internal temperature T0 of the power battery;

[0019] Based on the operating parameters and the internal temperature T0, the operating scenario of the power battery is determined, including a low-temperature charging scenario, a high-temperature charging scenario, and a discharging scenario.

[0020] If the power battery is in the low-temperature charging scenario, the battery circulation loop is controlled to supply heat to the power battery;

[0021] If the power battery is in the high-temperature charging scenario or the discharging scenario, then the battery circulation loop and / or the cooling circulation loop are controlled to supply cooling to the power battery.

[0022] In some embodiments, determining the operating scenario of the power battery based on the operating parameters and the internal temperature T0 includes:

[0023] The charging or discharging state of the power battery is determined based on the operating parameters.

[0024] During charging:

[0025] If the internal temperature T0 is lower than the first target temperature T1, the power battery is in a low-temperature charging scenario.

[0026] If the internal temperature T0 is greater than or equal to the second target temperature T2, then the power battery is in a high-temperature charging scenario.

[0027] T2 is greater than T1.

[0028] In some embodiments, the first target temperature T1 ranges from 0 to 5°C; the second target temperature T2 ranges from 30°C to 40°C.

[0029] In some embodiments, the low-temperature charging scenario includes a low-temperature slow charging scenario and a low-temperature fast charging scenario;

[0030] In the low-temperature slow charging scenario, controlling the battery circulation loop to supply heat to the power battery includes:

[0031] When the internal temperature T0 is lower than the third target temperature T3, the heater is activated, the three-way solenoid valve connects the battery cooler and the power battery, and the heater supplies heat to the power battery by heating the heat exchange medium in the battery circulation loop.

[0032] When the internal temperature TO is greater than or equal to the fourth target temperature T4, the heater is turned off, the three-way solenoid valve disconnects the battery cooler and the power battery, and the heater stops supplying heat to the power battery.

[0033] Among them, T4 is greater than T3;

[0034] In a low-temperature fast charging scenario, controlling the battery circulation loop to supply heat to the power battery includes:

[0035] When the internal temperature T0 is lower than the third target temperature T3, the heater is activated, the three-way solenoid valve connects the battery cooler and the power battery, and the heater supplies heat to the power battery by heating the heat exchange medium in the battery circulation loop.

[0036] When the internal temperature TO is greater than or equal to the fifth target temperature T5, the heater is turned off, the three-way solenoid valve disconnects the battery cooler and the power battery, and the heater stops supplying heat to the power battery.

[0037] Among them, T5 is greater than T3 and T5 is less than T4.

[0038] In some embodiments, controlling the battery circulation loop and / or the cooling circulation loop to supply cooling to the power battery includes:

[0039] If the internal temperature T0 of the power battery is greater than or equal to the sixth target temperature T6, then the battery cooler and / or the radiator is activated, and the battery cooler or the radiator supplies cooling to the power battery by cooling the heat exchange medium in the battery circulation loop.

[0040] If the internal temperature T0 of the power battery is greater than or equal to the seventh target temperature T7, then the compressor is started, and cooling is supplied to the battery cooler through the coupling bypass, and the battery cooler supplies cooling to the power battery.

[0041] Among them, T7 is greater than or equal to T6.

[0042] On the other hand, a vehicle is provided that employs the battery thermal management system or the control method described in this disclosure.

[0043] The beneficial effects of the technical solution provided in this disclosure include at least the following:

[0044] The battery thermal management system disclosed herein includes two parts: a battery circulation loop and a cooling circulation loop. The battery circulation loop has a heater to heat the power battery and a radiator and a battery cooler to cool the power battery. The cooling circulation loop can provide strong cooling capacity for the power battery by using a compressor, evaporator and condenser, so that the power battery can always maintain its optimal operating range and perform at its best in any application scenario, ensuring the vehicle's range, safety and thermal balance. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the battery thermal management system provided in an embodiment of this disclosure;

[0047] Figure 2 This is a flowchart illustrating the control method provided in an embodiment of this disclosure.

[0048] The reference numerals in the figure are respectively:

[0049] 1. Power battery; 2. Heater; 3. Water pump; 4. Battery cooler; 5. Radiator; 6. Three-way solenoid valve; 7. Compressor; 8. Condenser; 9. Evaporator; 10. Shut-off valve; 11. Coupling bypass; 12. Bypass solenoid valve; 13. Fan assembly; 14. Water storage device. Detailed Implementation

[0050] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0051] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0052] Unless otherwise defined, all technical terms used in the embodiments of this disclosure have the same meaning as commonly understood by one of ordinary skill in the art.

[0053] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0054] Figure 1 This is a schematic diagram of the battery thermal management system provided in an embodiment of this disclosure.

[0055] On the one hand, combined with Figure 1 As shown, this embodiment provides a battery thermal management system, which includes a battery circulation loop and a cooling circulation loop.

[0056] The battery circulation loop includes a power battery 1, a heater 2, a water pump 3, a battery cooler 4, a radiator 5, and a three-way solenoid valve 6.

[0057] One end of the power battery 1 is connected to the heater 2 and the water pump 3 in sequence. The battery cooler 4 and the radiator 5 are connected in parallel, and one end is connected to the water pump 3. The other end is connected to two ports of the three-way solenoid valve 6. The last port of the three-way solenoid valve 6 is connected to the other end of the power battery 1.

[0058] The cooling cycle circuit includes compressor 7, condenser 8, evaporator 9, shut-off valve 10, and coupling bypass 11.

[0059] The compressor 7, evaporator 9, shut-off valve 10 and condenser 8 are connected in sequence in a loop. The upper coupling bypass 11 is connected in parallel to both ends of the evaporator 9 and flows through the battery cooler 4.

[0060] The battery thermal management system of this embodiment includes two parts: a battery circulation loop and a cooling circulation loop. The battery circulation loop has a heater 2 to heat the power battery 1 and a radiator 5 and a battery cooler 4 to cool the power battery 1. The cooling circulation loop can provide strong cooling capacity for the power battery 1 by using a compressor 7, an evaporator 9 and a condenser 8, so that the power battery 1 can always maintain its optimal operating range and perform optimally in any application scenario, ensuring the vehicle's range, safety and thermal balance.

[0061] In some possible implementations, the battery thermal management system also includes a controller that is electrically connected to the water pump 3, heater 2, three-way solenoid valve 6, and compressor 7, and can use electrical signals to control the starting and stopping, flow rate, speed, and other operating parameters of the water pump 3, heater 2, three-way solenoid valve 6, and compressor 7.

[0062] For example, the controller includes a memory and a processor, which are electrically connected, for example, via a bus. The memory is used to store applications and is controlled to execute by the processor, which executes the applications to achieve functional control of the battery thermal management system.

[0063] Among them, the battery cooler 4, also known as the chiller, is a key component of battery thermal management. Its function is to introduce refrigerant into the refrigeration cycle and absorb the heat of the heat exchange medium in the battery cycle. In this process, the refrigerant carries away the heat of the coolant through heat exchange, thereby cooling the battery.

[0064] In some other possible implementations, the three-way solenoid valve 6 is a proportional solenoid valve, which can use pulse width modulation (PWM) control to control the flow rate of the liquid flowing through it.

[0065] Furthermore, in the default state, the three-way solenoid valve 6 connects the battery cooler 4 and the power battery 1; when powered on, it connects the radiator 5 and the power battery 1.

[0066] Combination Figure 1 As shown, in some embodiments, the coupling bypass 11 is provided with a bypass solenoid valve 12, which is used to control the opening and closing of the coupling bypass 11.

[0067] Therefore, the refrigeration cycle system of this embodiment can use the bypass solenoid valve 12 to control whether heat exchange medium flows through the coupling bypass 11 through the battery cooler 4, control the coupling of the refrigeration cycle loop and the battery cycle loop, and use the bypass solenoid valve 12 to control the flow rate in the coupling bypass 11, so as to realize the adjustment and control of the cooling capacity coupling.

[0068] Combination Figure 1 As shown, in some embodiments, the battery circulation loop also includes a fan device 13 and a water storage device 14. The fan device 13 is located on one side of the radiator 5 and is used to blow airflow through the radiator 5. The water storage device 14 is used to store the heat exchange medium in the battery circulation loop.

[0069] By arranging a fan device 13 on one side of the radiator 5, the airflow is propelled through the radiator 5, accelerating the airflow speed on the surface of the radiator 5, which helps to improve the heat dissipation efficiency of the radiator 5.

[0070] Furthermore, the fan device 13 has three speed settings: high, medium, and low. The fan device 13 rotates at 2000 rpm at the high speed setting, 1600 rpm at the medium speed setting, and 1200 rpm at the low speed setting.

[0071] Combination Figure 1 As shown, in some embodiments, the battery thermal management system further includes a temperature sensor; the temperature sensor is located inside the power battery 1 and is used to detect the internal temperature T0 of the power battery 1.

[0072] In this embodiment, the temperature inside the power battery 1 can be monitored by a temperature sensor located inside the power battery 1, and a battery thermal management strategy can be determined based on the temperature. This ensures that the power battery 1 always maintains its optimal operating range in any application scenario, performs at its best, and guarantees the vehicle's range, safety, and thermal balance.

[0073] On the other hand, combining Figure 2 As shown, this embodiment provides a control method for the battery thermal management system of this disclosure.

[0074] The control method in this embodiment adopts the battery thermal management system disclosed herein and has all the beneficial technical effects of all embodiments herein.

[0075] Control methods include:

[0076] Obtain the operating parameters of power battery 1, including its internal temperature T0.

[0077] Based on the operating parameters and internal temperature T0, the working scenarios of power battery 1 are determined, including low-temperature charging scenario, high-temperature charging scenario, and discharge scenario.

[0078] If the power battery 1 is in a low-temperature charging scenario, the battery circulation loop is controlled to supply heat to the power battery 1.

[0079] If the power battery 1 is in a high-temperature charging or discharging scenario, the battery circulation loop and / or cooling circulation loop will supply cooling to the power battery 1.

[0080] The control method of this embodiment is applicable to the battery thermal management system of this disclosure. Based on the operating parameters and internal temperature T0 of the power battery 1, the working scenario of the power battery 1 is determined, and different thermal management strategies are adopted according to different working scenarios, so as to ensure that the power battery 1 always maintains the optimal working range in any application scenario, exerts the best performance, and ensures the vehicle's range, safety and thermal balance.

[0081] For example, the internal temperature T0 of the power battery 1 is measured using a temperature sensor inside the power battery 1.

[0082] In some embodiments, the operating scenario of the power battery 1 is determined based on operating parameters and internal temperature T0, including:

[0083] The charging or discharging state of power battery 1 is determined based on the operating parameters.

[0084] For example, the operating parameters include, but are not limited to, the current and voltage parameters of the power battery 1. The current and voltage of the power battery 1 differ significantly between charging and discharging states. Based on the current and / or voltage parameters, and in conjunction with common knowledge in the art, it can be determined whether the power battery 1 is in a charging state or a discharging state.

[0085] This embodiment identifies the charging and discharging states of the power battery 1 because the thermal characteristics of the power battery 1 differ significantly between the charging and discharging states. In the charging state, the power battery 1 generates little heat, but its temperature affects charging efficiency; in the discharging state, the power battery 1 generates a lot of heat and requires cooling to prevent thermal runaway.

[0086] Among them, power battery 1 is in a charging state:

[0087] If the internal temperature T0 is lower than the first target temperature T1, then the power battery 1 is in a low-temperature charging scenario.

[0088] If the internal temperature T0 is greater than or equal to the second target temperature T2, then the power battery 1 is in a high-temperature charging scenario; T2 is greater than T1.

[0089] The charging efficiency of the power battery 1 is affected by both low-temperature and high-temperature charging scenarios. In the former, the charging efficiency is low or even impossible due to the low temperature, while in the latter, the temperature is too high, posing a risk of thermal runaway. Therefore, the control method in this embodiment distinguishes between these two charging scenarios to select a more suitable thermal management strategy.

[0090] In some possible implementations, the first target temperature T1 ranges from 0 to 5℃; the second target temperature T2 ranges from 30℃ to 40℃. For example, the first target temperature T1 can be 0℃, 1℃, 2℃, 3℃, 4℃, 5℃, etc.; the second target temperature T2 can be 30℃, 32℃, 34℃, 36℃, 38℃, 40℃, etc.

[0091] In some embodiments, low-temperature charging scenarios include low-temperature slow charging scenarios and low-temperature fast charging scenarios.

[0092] In low-temperature slow charging scenarios, controlling the battery circulation loop to supply heat to power battery 1 includes:

[0093] When the internal temperature T0 is lower than the third target temperature T3, the heater 2 is activated, the three-way solenoid valve connects the battery cooler 4 and the power battery 1, and the heater 2 supplies heat to the power battery 1 by heating the heat exchange medium in the battery circulation loop.

[0094] When the internal temperature TO is greater than or equal to the fourth target temperature T4, heater 2 is turned off, the three-way solenoid valve disconnects the battery cooler 4 and the power battery 1, and heater 2 stops supplying heat to the power battery 1; wherein, T4 is greater than T3.

[0095] In low-temperature fast charging scenarios, controlling the battery circulation loop to supply heat to power battery 1 includes:

[0096] When the internal temperature T0 is lower than the third target temperature T3, the heater 2 is activated, the three-way solenoid valve connects the battery cooler 4 and the power battery 1, and the heater 2 supplies heat to the power battery 1 by heating the heat exchange medium in the battery circulation loop.

[0097] When the internal temperature TO is greater than or equal to the fifth target temperature T5, heater 2 is turned off, the three-way solenoid valve disconnects the battery cooler 4 and the power battery 1, and heater 2 stops supplying heat to the power battery 1; wherein, T5 is greater than T3 and less than T4.

[0098] Preferably, the third target temperature T3 is 0°C, the fourth target temperature T4 is 5°C, and the fifth target temperature is 3°C.

[0099] Therefore, the control method of this embodiment fully considers the fast charging scenario and the slow charging scenario in the low temperature environment, and implements different thermal management strategies to ensure that the power battery 1 is maintained in the optimal working range under the two scenarios, exerts the best performance, and ensures the vehicle's range, safety and thermal balance.

[0100] In some embodiments, controlling the battery circulation loop and / or cooling circulation loop to supply cooling to the power battery 1 includes:

[0101] If the internal temperature T0 of the power battery 1 is greater than or equal to the sixth target temperature T6, the battery cooler 4 and / or radiator 5 will be activated. The battery cooler 4 or radiator 5 will supply cooling to the power battery 1 by cooling the heat exchange medium in the battery circulation loop.

[0102] If the internal temperature T0 of the power battery 1 is greater than or equal to the seventh target temperature T7, then the compressor 7 is started and the battery cooler 4 is supplied with cooling through the coupling bypass 11, and the battery cooler 4 supplies cooling to the power battery 1.

[0103] Among them, T7 is greater than or equal to T6.

[0104] Preferably, the third target temperature T3 is 0°C, the fourth target temperature T4 is 5°C, and the fifth target temperature is 3°C.

[0105] Therefore, the control method of this embodiment can cool the power battery 1 under high-temperature charging and discharging scenarios, ensuring that the power battery 1 is maintained within the optimal operating range under both scenarios, exerting optimal performance, and ensuring the vehicle's range, safety, and thermal balance.

[0106] The control method provided in this disclosure will be described in detail below, in conjunction with the battery thermal management system of this disclosure:

[0107] In low-temperature charging scenarios, the fan device 13 and compressor 7 are not operating, while the water pump 3, heater 2, and three-way solenoid valve 6 are operating, with the three-way solenoid valve 6 in its initial state. During heating, the inlet temperature of the power battery 1 needs to be controlled to ensure it is below the highest value of the battery's optimal operating temperature. The water pump 3 can be flow-controlled via the PWM speed control module; the heater 2's heating power can be controlled.

[0108] During slow charging, when the lowest temperature inside the power battery 1 is lower than the third target temperature T3, the water pump 3 and heater 2 are turned on; when the lowest temperature inside the power battery 1 is greater than or equal to the fourth target temperature T4, the water pump 3 and heater 2 are turned off. The difference between T3 and T4 is mainly to avoid frequent switching of the water pump 3 and heater 2, providing a buffer period. Similarly, during low-temperature fast charging, the water pump 3 and PTC heater 2 are turned on at T1, and turned off at the fifth target temperature T5. Considering that the self-generated heat of the power battery 1 during fast charging is greater than that during slow charging, the fifth target temperature T5 is slightly lower than the fourth target temperature T4.

[0109] In high-temperature charging scenarios, the power battery 1 requires charging cooling, which is divided into a normal cooling mode and a forced cooling mode. The normal cooling mode is suitable for operating conditions where the temperature of the power battery 1 is below 40℃, while the forced cooling mode is suitable for operating conditions where the temperature of the power battery 1 is above 40℃. Both modes are further divided into fast charging and slow charging scenarios.

[0110] In the normal cooling mode, the large circulation loop is used. The fan device 13 and water pump 3 are turned on, while the compressor 7 and heater 2 are not working. The three-way solenoid valve 6 connects the radiator 5 and the power battery 1.

[0111] In normal cooling mode, when the minimum temperature of power battery 1 is greater than or equal to the sixth target temperature T6, water pump 3 is turned on, fan device 13 runs at low speed, and three-way solenoid valve 6 is energized (connecting radiator 5 and power battery 1); when it is less than (T6-2)℃, water pump 3 and fan device 13 are turned off, and three-way solenoid valve 6 is de-energized (connecting battery cooler 4 and power battery 1). When the temperature of power battery 1 is slightly higher than T6, the speed of fan device 13 can be increased.

[0112] In the normal cooling mode, the control logic for fast charging and slow charging is the same, with only the control parameters being adjusted adaptively, which will not be elaborated here.

[0113] Discharge cooling of the power battery in discharge scenarios: divided into water pump cooling mode, conventional cooling mode and forced cooling mode, the working status of each component is shown in the table below.

[0114]

[0115] In water pump cooling mode, when the maximum temperature of power battery 1 is greater than or equal to the sixth target temperature T6, water pump 3 works, and three-way solenoid valve 6 is energized and maintained; when the minimum temperature of power battery 1 is less than (T6-3)℃, water pump 3 is turned off, and three-way solenoid valve 6 is de-energized.

[0116] In normal cooling mode, when the maximum temperature of the power battery 1 is greater than or equal to the eighth target temperature T8, the water pump 3 is turned on, the fan device 13 is turned on at low speed, and the three-way solenoid valve 6 is energized. When the temperature is less than (T8-2)℃, the fan device 13 is turned off, and the three-way solenoid valve 6 is de-energized. However, when the maximum temperature reaches T9 (T9>T8), the fan device 13 is turned on at high speed, and the three-way solenoid valve 6 is energized. Similarly, when the temperature is less than (T9-3)℃ [(T9-3)>(T8-2)], the fan device 13 is turned off, and the three-way solenoid valve 6 is also de-energized.

[0117] In forced cooling mode, when the internal temperature T0 of the power battery 1 is greater than or equal to the seventh target temperature T7, the fan device 13 and heater 2 are turned off, the three-way solenoid valve 6 is de-energized, and the compressor 7, water pump 3, and bypass solenoid valve 12 are opened.

[0118] On the other hand, this embodiment provides a vehicle that employs the battery thermal management system or the control method disclosed herein.

[0119] The vehicle in this embodiment uses the battery thermal management system or control method disclosed herein, and has all the beneficial technical effects of all embodiments herein.

[0120] It should be noted that in this article, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0121] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0122] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0123] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0124] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this disclosure.

[0125] The above description is merely an embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A control method of a battery thermal management system, characterized by, The battery thermal management system comprises a battery circulation loop and a refrigeration circulation loop; The battery circulation loop comprises a power battery, a heater, a water pump, a battery cooler, a radiator and a three-way electromagnetic valve; One end of the power battery is connected with the heater and the water pump in sequence, the battery cooler and the radiator are connected with the water pump at their one end, and the other end of the battery cooler and the radiator are connected with two openings of the three-way electromagnetic valve respectively, and the last opening of the three-way electromagnetic valve is connected with the other end of the power battery; The cooling circulation loop comprises a compressor, a condenser, an evaporator, a stop valve and a coupling bypass; The compressor, the evaporator, the stop valve and the condenser are connected in sequence, and the coupling bypass is connected with both ends of the evaporator in parallel and flows through the battery cooler; The control method comprises: obtaining an operating parameter of the power battery and an internal temperature T0 of the power battery; determining a working scenario of the power battery according to the operating parameter and the internal temperature T0, wherein the working scenario comprises a low-temperature charging scenario, a high-temperature charging scenario and a discharging scenario; if the power battery is in the low-temperature charging scenario, controlling the battery circulation loop to supply heat to the power battery; if the power battery is in the high-temperature charging scenario or the discharging scenario, controlling the battery circulation loop and / or the refrigeration circulation loop to supply cold to the power battery; the low-temperature charging scenario comprises a low-temperature slow charging scenario and a low-temperature fast charging scenario; in the low-temperature slow charging scenario, the control of the battery circulation loop to supply heat to the power battery comprises: when the internal temperature T0 is lower than a third target temperature T3, the heater is started, the three-way battery valve is turned on to the battery cooler and the power battery, and the heater supplies heat to the power battery by heating the heat exchange medium in the battery circulation loop; when the internal temperature T0 is greater than or equal to a fourth target temperature T4, the heater is turned off, the three-way battery valve is turned off to the battery cooler and the power battery, and the heater stops supplying heat to the power battery; wherein T4 is greater than T3; in the low-temperature fast charging scenario, the control of the battery circulation loop to supply heat to the power battery comprises: when the internal temperature T0 is lower than a third target temperature T3, the heater is started, the three-way battery valve is turned on to the battery cooler and the power battery, and the heater supplies heat to the power battery by heating the heat exchange medium in the battery circulation loop; when the internal temperature T0 is greater than or equal to a fifth target temperature T5, the heater is turned off, the three-way battery valve is turned off to the battery cooler and the power battery, and the heater stops supplying heat to the power battery; wherein T5 is greater than T3 and less than T4; the third target temperature T3 is 0℃, the fourth target temperature T4 is 5℃, and the fifth target temperature is 3℃.

2. The control method according to claim 1, characterized by, the determination of the working scenario of the power battery according to the operating parameter and the internal temperature T0 comprises: determining the charging or discharging state of the power battery according to the operating parameter; wherein, in the charging state: If the internal temperature T0 is lower than a first target temperature T1, the power battery is in a low-temperature charging scenario; If the internal temperature T0 is greater than or equal to a second target temperature T2, the power battery is in a high-temperature charging scenario; T2 is greater than T1.

3. The control method according to claim 2, characterized by, The first target temperature T1 ranges from 0 to 5℃, and the second target temperature T2 ranges from 30 to 40℃.

4. The control method according to claim 1, characterized by, The control of the battery circulation loop and / or the refrigeration circulation loop to supply cold to the power battery comprises: If the internal temperature T0 of the power battery is greater than or equal to a sixth target temperature T6, the battery cooler and / or the radiator are started, and the battery cooler or the radiator supplies cold to the power battery by cooling the heat exchange medium in the battery circulation loop; If the internal temperature T0 of the power battery is greater than or equal to a seventh target temperature T7, the compressor is started to supply cold to the battery cooler through the coupling bypass, and the battery cooler supplies cold to the power battery; Wherein, T7 is greater than or equal to T6.

5. The control method according to claim 1, characterized by, The coupling bypass is provided with a bypass electromagnetic valve for controlling the on-off of the coupling bypass.

6. The control method according to claim 1, characterized by, The battery circulation loop further comprises a fan device and a water storage device, the fan device is located on one side of the radiator, and the fan device is used to drive airflow to flow through the radiator; The water storage device is used to store the heat exchange medium in the battery circulation loop.

7. The control method according to claim 1, characterized by, The battery thermal management system further comprises a temperature sensor; The temperature sensor is located in the power battery, and the temperature sensor is used to detect the internal temperature T0 of the power battery.

8. A vehicle characterized by comprising: The vehicle adopts the control method of any one of claims 1-7.

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