Battery thermal management system and vehicle

Abstract

The utility model provides a battery thermal management system and a vehicle, the battery thermal management system is applied to the vehicle, the vehicle comprises a power battery, and the battery thermal management system comprises an electric heating loop and a waste heat heating loop; the electric heating loop comprises an electric heating element, and the electric heating element is used for heating cooling liquid of the power battery; the waste heat heating loop comprises a waste heat exchanger, the waste heat exchanger is connected with the electric heating element in series, and the waste heat exchanger is used for being connected with waste heat liquid generated by the vehicle so that waste heat of the waste heat liquid can be used for heating cooling liquid of the power battery. According to the scheme provided by the embodiment of the invention, the waste heat heating loop is introduced on the basis of the electric heating loop, the heat of the vehicle heating part can be effectively recycled through heat exchange of the waste heat liquid in the waste heat exchanger, the energy utilization efficiency is improved, the energy consumption of the electric heating element is reduced, the loss of the SOC of the power battery is reduced, and the endurance of the vehicle is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of vehicle thermal management, and particularly to a battery thermal management system and a vehicle. Background Art

[0002] In related technologies, electric heating elements are mostly used in battery thermal management systems to heat power batteries. However, the energy consumption of electric heating elements is relatively high, resulting in a large loss of the State of Charge (SOC) of the power battery and affecting the vehicle's cruising range. Summary of the Utility Model

[0003] This application provides a battery thermal management system and a vehicle, which can effectively reduce the energy consumption of electric heating elements, reduce the loss of the SOC of the power battery, and extend the vehicle's cruising range.

[0004] In a first aspect, this application provides a battery thermal management system applied to a vehicle. The vehicle includes a power battery, and the battery thermal management system includes:

[0005] An electric heating circuit including an electric heating element for heating the coolant of the power battery;

[0006] A waste heat heating circuit including a waste heat heat exchanger connected in series with the electric heating element. The waste heat heat exchanger is used to access the waste heat liquid generated by the vehicle to heat the coolant of the power battery by using the waste heat of the waste heat liquid.

[0007] The solution provided by the embodiments of this application introduces a waste heat heating circuit on the basis of the electric heating circuit, which can effectively recover the heat of the vehicle's heat-generating components through the heat exchange of the waste heat liquid in the waste heat heat exchanger, improve the energy utilization efficiency, reduce the energy consumption of the electric heating element, reduce the loss of the SOC of the power battery, and extend the vehicle's cruising range.

[0008] In combination with the first aspect, in some possible implementation manners, the electric heating circuit further includes:

[0009] A water pump, a first temperature sensor, and a second temperature sensor. The first temperature sensor, the water pump, the electric heating element, and the second temperature sensor are connected in series in sequence. The water pump is used to drive the coolant flowing through the power battery, and the first temperature sensor and the second temperature sensor are respectively arranged at the liquid inlet end and the liquid outlet end of the power battery to detect the inlet water temperature and the outlet water temperature of the coolant of the power battery.

[0010] In combination with the first aspect and the above implementation manners, in some possible implementation manners, the vehicle includes a gearbox or a hydraulic oil tank, and the gearbox or the hydraulic oil tank has a circulating oil inlet and a circulating oil outlet;

[0011] The waste heat heating circuit includes:

[0012] A first waste heat circuit, including a first heat exchanger, the first heat exchanger is connected in series with the electric heating element, the first heat exchanger has a waste heat oil inlet and a waste heat oil outlet, the waste heat oil inlet is connected to the circulating oil outlet, and the waste heat oil outlet is connected to the circulating oil inlet.

[0013] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the first waste heat circuit further includes:

[0014] A third temperature sensor and a first solenoid valve, the third temperature sensor, the first solenoid valve and the first heat exchanger are connected in series in sequence along the flow direction of the circulating oil, the temperature sensor is used to detect the temperature of the circulating oil at the circulating oil outlet, and the first solenoid valve is used to adjust the flow rate of the circulating oil or control the on-off of the circulating oil.

[0015] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the vehicle includes an engine or a motor, and the engine or the motor has a circulating water inlet and a circulating water outlet;

[0016] The waste heat heating circuit includes:

[0017] A second waste heat circuit, including a second heat exchanger, the second heat exchanger is connected in series with the electric heating element and the first heat exchanger, the second heat exchanger has a waste heat water inlet and a waste heat water outlet, the waste heat water inlet is connected to the circulating water outlet, and the waste heat water outlet is connected to the circulating water inlet.

[0018] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the second waste heat circuit further includes:

[0019] A fourth temperature sensor and a second solenoid valve, the fourth temperature sensor, the second solenoid valve and the second heat exchanger are connected in series in sequence along the flow direction of the circulating water, the temperature sensor is used to detect the temperature of the circulating water at the circulating water outlet, and the second solenoid valve is used to adjust the flow rate of the circulating water or control the on-off of the circulating water.

[0020] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the battery thermal management system further includes:

[0021] A cooling circuit, including a third heat exchanger, the third heat exchanger is connected in series with the electric heating element and is used to cool the coolant of the power battery.

[0022] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the cooling circuit further includes:

[0023] A compressor, a condenser, and an electronic expansion valve, the compressor, the condenser, the electronic expansion valve, and the third heat exchanger are connected in series in sequence; wherein, the condenser is configured with a cooling fan.

[0024] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the battery thermal management system further includes:

[0025] A controller, electrically connected to the electric heating circuit, the waste heat heating circuit, and the cooling circuit.

[0026] In a second aspect, the present application further provides a vehicle, including:

[0027] The vehicle thermal management system according to any one of the above first aspects.

[0028] The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0029] By reading the detailed description of the following embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the embodiments and are not considered as a limitation to the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0030] Figure 1 is a schematic diagram of a vehicle thermal management system provided by an embodiment of the present application;

[0031] Figure 2 is a structural schematic diagram of a vehicle thermal management system provided by an embodiment of the present application.

[0032] The descriptions of the reference numerals in the drawings are as follows:

[0033] 10—Power battery;

[0034] 20—Transmission; 21—Hydraulic oil tank;

[0035] 22—Engine; 23—Motor;

[0036] 100—Electric heating circuit; 110—Electric heating element; 120—Water pump; 130—First temperature sensor; 140—Second temperature sensor;

[0037] 200—Waste heat heating circuit; 201—Waste heat heat exchanger;

[0038] 210—First waste heat circuit; 211—First heat exchanger; 212—Third temperature sensor; 213—First solenoid valve;

[0039] 220 - The second waste heat circuit; 221 - The second heat exchanger; 222 - The fourth temperature sensor; 223 - The second solenoid valve;

[0040] 300 - The cooling circuit; 310 - The third heat exchanger; 320 - The compressor; 330 - The condenser; 331 - The radiator fan; 340 - The electronic expansion valve. Specific embodiments

[0041] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0043] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0045] In the description of the embodiments of this application, technical terms such as "first", "second", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features.

[0046] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0047] In related technologies, electric heating elements are mostly used in battery thermal management systems to heat power batteries. However, the energy consumption of electric heating elements is relatively high, resulting in a large loss of the SOC (State of Charge) of the power battery, which affects the vehicle's cruising range.

[0048] To solve the above technical problems, the embodiments of the present application provide a battery thermal management system and a vehicle. The following provides a detailed introduction to the battery thermal management system and the vehicle provided by the embodiments of the present application with reference to the accompanying drawings of the specification.

[0049] The embodiments of the present application provide a vehicle, including a vehicle thermal management system. The battery thermal management system can accurately control the temperature of the vehicle's power battery by heating or cooling the power battery, ensuring that the battery operates within the optimal temperature range, thereby extending the battery life and improving the battery performance.

[0050] See Figure 1 and Figure 2 , the battery thermal management system includes an electric heating circuit 100 and a waste heat heating circuit 200; the electric heating circuit 100 includes an electric heating element 110, and the electric heating element 110 is used to heat the coolant of the power battery 10; the waste heat heating circuit 200 includes a waste heat heat exchanger 201, the waste heat heat exchanger 201 is connected in series with the electric heating element 110, and the waste heat heat exchanger 201 is used to access the waste heat liquid generated by the vehicle to heat the coolant of the power battery 10 by using the waste heat of the waste heat liquid.

[0051] The electric heating element 110 generates heat through electro-thermal conversion to heat the vehicle cabin. The electric heating element 110 usually adopts a positive temperature coefficient thermistor (Positive Temperature Coefficient, PTC), so it can also be directly called PTC. According to the characteristics of the heating medium, the electric heating element 110 can be divided into an air heating heater (APTC) and a water heating heater (WPTC). The air heating heater is installed in the air conditioning box to directly heat the air in the passenger compartment, the power battery, etc.; while the water heating heater is installed outside the air conditioning box, and transfers the heat to the heater core in the air conditioning box in the form of heating the coolant, and then heats the air in the passenger compartment, the power battery, etc. The PTC generates heat through a positive temperature coefficient thermistor, and the energy consumption is very high. The maximum value of its heating energy efficiency ratio does not exceed 1, which means that at most 1 kW of heat can be generated with 1 kW of electricity. Especially when driving in winter, if the warm air is turned on, at least one-third of the power will be consumed throughout the journey, and the greater the power and the longer the time, the greater the energy consumption. It is particularly likely to cause a large loss of the SOC of the power battery, seriously affecting the vehicle's endurance.

[0052] Based on this, on the basis of the electric heating circuit 100 including the electric heating element 110, the present application embodiment further sets a waste heat heating circuit 200 including a waste heat heat exchanger 201. The waste heat heating circuit 200 can recover the waste heat of the vehicle heating components through the waste heat heat exchanger 201, and cooperate with the electric heating element 110 of the electric heating circuit 100 to provide the heat required for the passenger compartment, the power battery, etc.

[0053] The solution provided by the embodiment of the present application introduces the waste heat heating circuit 200 on the basis of the electric heating circuit 100, and can effectively recover the heat of the vehicle heating components through the heat exchange of the waste heat liquid in the waste heat heat exchanger 201, improve the energy utilization efficiency, reduce the energy consumption of the electric heating element 110, reduce the loss of the power battery SOC, and extend the vehicle endurance.

[0054] See Figure 1 and Figure 2 , in some embodiments, the electric heating circuit 100 may further include a water pump 120, a first temperature sensor 130, and a second temperature sensor 140. The first temperature sensor 130, the water pump 120, the electric heating element 110, and the second temperature sensor 140 are connected in series in sequence; the water pump 120 is used to drive the coolant flowing through the power battery 10, and the first temperature sensor 130 and the second temperature sensor 140 are respectively arranged at the liquid inlet end and the liquid outlet end of the power battery 10 to detect the inlet water temperature and the outlet water temperature of the coolant of the power battery 10.

[0055] The electric heating circuit 100 contains coolant. Usually, the coolant is regular coolant, but ethylene glycol-based coolant, propylene glycol-based coolant, etc. can also be used. The water pump 120 can provide power for the circulating flow of the coolant in the electric heating circuit 100, driving the coolant to flow through the electric heating element 110 and the power battery 10 in sequence. The first temperature sensor 130 and the second temperature sensor 140 respectively set at the liquid inlet end and the liquid outlet end of the power battery 10 can detect the temperatures at the liquid inlet end and the liquid outlet end of the power battery 10. According to the temperatures and the difference at the liquid inlet end and the liquid outlet end, the flow rate and flow volume of the coolant can be controlled through the water pump 120 to take away the heat generated by the power battery 10, realizing the cooling of the power battery 10. In addition, according to the temperatures and the difference at the liquid inlet end and the liquid outlet end, it can also be determined whether to heat the coolant in the electric heating circuit 100 through the electric heating element 110, that is, to heat the coolant during cold charging of the vehicle, realizing safe and efficient charging in a low-temperature environment.

[0056] As can be seen from the above, the energy consumption of the electric heating element 110 is relatively high. In order to reduce the energy consumption of the electric heating element 110, on the basis of the heating of the electric heating element 110, supplementary heating can be carried out in combination with the waste heat heating circuit 200. There are various ways to implement the waste heat heating circuit 200. For different vehicle models, the corresponding waste heat circuits can be set separately or comprehensively according to the actual situation.

[0057] See Figure 1 and Figure 2 , in a possible implementation, for a vehicle including a transmission 20 or a hydraulic oil tank 21, the transmission 20 or the hydraulic oil tank 21 can have a circulating oil inlet and a circulating oil outlet. At this time, a first waste heat circuit 210 can be set. See Figure 1 and Figure 2 , the first waste heat circuit 210 can include a first heat exchanger 211. The first heat exchanger 211 is connected in series with the electric heating element 110. The first heat exchanger 211 has a waste heat oil inlet and a waste heat oil outlet. The waste heat oil inlet is connected to the circulating oil outlet, and the waste heat oil outlet is connected to the circulating oil inlet. The transmission oil of the transmission 20 or the hydraulic oil of the hydraulic oil tank 21 flows in the first waste heat circuit 210 and passes through the first heat exchanger 211. In the first heat exchanger 211, the coolant of the power battery 10 exchanges heat with the hydraulic oil or transmission oil with waste heat under the vehicle working state, and the coolant of the power battery 10 can be heated to realize the heating of the power battery 10 in a low-temperature environment.

[0058] In some embodiments, the first waste heat circuit 210 may further include a third temperature sensor 212 and a first solenoid valve 213. The third temperature sensor 212, the first solenoid valve 213, and the first heat exchanger 211 are connected in series in sequence along the flow direction of the circulating oil. The temperature sensor is used to detect the temperature of the circulating oil at the outlet of the circulating oil, and the first solenoid valve 213 is used to adjust the flow rate of the circulating oil or control the on-off of the circulating oil.

[0059] When starting the vehicle in a low-temperature environment, it takes a certain amount of time for the temperature of the transmission oil of the transmission 20 or the hydraulic oil of the hydraulic oil tank 21 to reach the preset stability. Therefore, when the vehicle is just started, heat exchange is not immediately carried out through the first heat exchanger 211. When the temperature sensor detects that the temperature of the transmission oil of the transmission 20 or the hydraulic oil of the hydraulic oil tank 21 is greater than the preset temperature, the first solenoid valve 213 is controlled to open, so that the transmission oil or the hydraulic oil enters the first heat exchanger 211 to exchange heat with the coolant of the power battery 10. In addition, after the first solenoid valve 213 is opened, the temperature of the power battery 10 can be accurately controlled by adjusting the opening degree of the first solenoid valve 213.

[0060] See Figure 1 and Figure 2 In another possible implementation, for a vehicle including an engine 22 or a motor 23, the engine 22 or the motor 23 may have a circulating water inlet and a circulating water outlet. At this time, a second waste heat circuit 220 may be provided. The second waste heat circuit 220 may include a second heat exchanger 221. The second heat exchanger 221 is connected in series with the electric heating element 110 and the first heat exchanger 211. The second heat exchanger 221 has a waste heat inlet and a waste heat outlet. The waste heat inlet is connected to the circulating water outlet, and the waste heat outlet is connected to the circulating water inlet. The cooling water of the engine 22 or the motor 23 flows in the second waste heat circuit 220 and flows through the second heat exchanger 221. The coolant of the power battery 10 in the first heat exchanger 211 exchanges heat with the cooling water of the engine 22 or the motor 23 having waste heat in the vehicle working state, which can heat the coolant of the power battery 10, realize the recovery and reuse of the waste heat of the engine 22 or the motor 23, and supplement the heating of the power battery 10 in a low-temperature environment.

[0061] In some embodiments, the second waste heat circuit 220 may further include a fourth temperature sensor 222 and a second solenoid valve 223. The fourth temperature sensor 222, the second solenoid valve 223, and the second heat exchanger 221 are connected in series in sequence along the flow direction of the circulating water. The temperature sensor is used to detect the temperature of the circulating water at the outlet of the circulating water, and the second solenoid valve 223 is used to adjust the flow rate of the circulating water or control the on-off of the circulating water.

[0062] Similar to the first waste heat circuit 210, when starting the vehicle in a low-temperature environment, it takes a certain amount of time for the temperature of the cooling water of the engine 22 or the motor 23 to reach the preset stability. Therefore, when the vehicle is just started, heat exchange is not immediately carried out through the second heat exchanger 221. When the temperature sensor detects that the temperature of the cooling water of the engine 22 or the motor 23 is greater than the preset temperature, the second solenoid valve 223 is controlled to open, so that the cooling water of the engine 22 or the motor 23 enters the second heat exchanger 221 to exchange heat with the coolant of the power battery 10. In addition, after the second solenoid valve 223 is opened, the temperature of the power battery 10 can be accurately controlled by adjusting the opening degree of the second solenoid valve 223.

[0063] See Figure 1 and Figure 2 , in normal temperature or high-temperature environments, in order to ensure the stable and reliable operation of the power battery 10, in some embodiments, the battery thermal management system may further include a cooling circuit 300. The cooling circuit 300 includes a third heat exchanger 310, and the third heat exchanger 310 is connected in series with the electric heating element 110 for cooling the coolant of the power battery 10.

[0064] Among them, the refrigerant circulating in the cooling circuit 300 enters the third heat exchanger 310, and can exchange heat with the coolant of the power battery 10 to reduce the temperature. After the coolant of the power battery 10 passes through the third heat exchanger 310 and exchanges heat to reduce the temperature, it flows back to the power battery 10 to achieve cooling of the power battery 10.

[0065] In some embodiments, the cooling circuit 300 may further include a compressor 320, a condenser 330, and an electronic expansion valve 340. The compressor 320, the condenser 330, the electronic expansion valve 340, and the third heat exchanger 310 are connected in series in sequence; among them, the condenser 330 is configured with a cooling fan 331.

[0066] Among them, the high-temperature and high-pressure gas compressed by the compressor 320 enters the condenser 330 through the cooling circuit 300 for heat dissipation. The refrigerant changes from a high-temperature and high-pressure gas to a medium-temperature and high-pressure liquid by dissipating heat in the condenser 330. By blowing the condenser 330 with the cooling fan 331, the heat can be transferred to the external air to achieve effective heat dissipation. The liquid refrigerant enters the third heat exchanger 310 after being depressurized by the electronic expansion valve 340. After depressurization, the refrigerant becomes a low-temperature and low-pressure gas-liquid mixture and absorbs heat and vaporizes in the evaporator, taking away the heat of the coolant of the power battery 10 to achieve refrigeration of the coolant of the power battery 10. The cooled coolant of the power battery 10 flows back to the power battery 10 to achieve cooling of the power battery 10.

[0067] In some embodiments, the battery thermal management system may further include a controller (not shown in the figure), and the controller is electrically connected to the electric heating circuit 100, the waste heat heating circuit 200, and the cooling circuit 300.

[0068] Among them, the controller may adopt a central controller. The controller may be electrically connected to the electric heating element 110, the first temperature sensor 130, and the second temperature sensor 140 of the electric heating circuit 100, the first solenoid valve 213 and the third temperature sensor 212 of the first waste heat circuit 210, the second solenoid valve 223 and the fourth temperature sensor 222 of the second waste heat circuit 220, and the compressor 320 of the cooling circuit 300.

[0069] In a low-temperature environment, the controller may control the electric heating element 110 to heat the coolant of the power battery 10, and turn on the first solenoid valve 213 and / or the second solenoid valve 223 to enable the first heat exchanger 211 and the second heat exchanger 221 to assist in heating the coolant of the power battery 10, reduce the heating power of the electric heating element 110, thereby reducing the energy consumption of the electric heating element 110, reducing the loss of the power battery 10 SOC, and extending the vehicle's cruising range.

[0070] In a normal-temperature or high-temperature environment, the controller may turn off the electric heating element 110, the first solenoid valve 213, and the second solenoid valve 223, and by controlling the compressor 320 of the cooling circuit 300, enable the third heat exchanger 310 to cool the coolant of the power battery 10 to ensure the stable and reliable operation of the power battery 10.

[0071] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery thermal management system is applied to a vehicle, and the vehicle includes a power battery (10), characterized in that, The battery thermal management system includes: An electric heating circuit (100), including an electric heating element (110), which is used to heat the coolant of the power battery (10); A waste heat heating circuit (200), including a waste heat heat exchanger (201), which is connected in series with the electric heating element (110). The waste heat heat exchanger (201) is used to access the waste heat liquid generated by the vehicle to heat the coolant of the power battery (10) by using the waste heat of the waste heat liquid.

2. The battery thermal management system according to claim 1, wherein The electric heating circuit (100) further includes: A water pump (120), a first temperature sensor (130) and a second temperature sensor (140). The first temperature sensor (130), the water pump (120), the electric heating element (110) and the second temperature sensor (140) are connected in series in sequence. The water pump (120) is used to drive the coolant flowing through the power battery (10). The first temperature sensor (130) and the second temperature sensor (140) are respectively arranged at the liquid inlet end and the liquid outlet end of the power battery (10) to detect the inlet water temperature and the outlet water temperature of the coolant of the power battery (10).

3. The battery thermal management system according to claim 1, characterized in that, The vehicle includes a gearbox (20) or a hydraulic oil tank (21), and the gearbox (20) or the hydraulic oil tank (21) has a circulating oil inlet and a circulating oil outlet; The waste heat heating circuit (200) includes: A first waste heat circuit (210), including a first heat exchanger (211), which is connected in series with the electric heating element (110). The first heat exchanger (211) has a waste heat oil inlet and a waste heat oil outlet. The waste heat oil inlet is connected to the circulating oil outlet, and the waste heat oil outlet is connected to the circulating oil inlet.

4. The battery thermal management system according to claim 3, characterized in that, The first waste heat circuit (210) further includes: A third temperature sensor (212) and a first solenoid valve (213). The third temperature sensor (212), the first solenoid valve (213) and the first heat exchanger (211) are connected in series in sequence along the flowing direction of the circulating oil. The temperature sensor is used to detect the temperature of the circulating oil at the circulating oil outlet. The first solenoid valve (213) is used to adjust the flow rate of the circulating oil or control the on / off of the circulating oil.

5. The battery thermal management system according to claim 3, wherein The vehicle includes an engine (22) or a motor (23), and the engine (22) or the motor (23) has a circulating water inlet and a circulating water outlet; The waste heat heating circuit (200) includes: A second waste heat circuit (220), including a second heat exchanger (221), which is connected in series with the electric heating element (110) and the first heat exchanger (211). The second heat exchanger (221) has a waste heat water inlet and a waste heat water outlet. The waste heat water inlet is connected to the circulating water outlet, and the waste heat water outlet is connected to the circulating water inlet.

6. The battery thermal management system according to claim 5, wherein The second waste heat circuit (220) further includes: A fourth temperature sensor (222) and a second solenoid valve (223), the fourth temperature sensor (222), the second solenoid valve (223) and the second heat exchanger (221) are connected in series in sequence along the flow direction of the circulating water. The temperature sensor is used to detect the temperature of the circulating water at the outlet of the circulating water, and the second solenoid valve (223) is used to adjust the flow rate of the circulating water or control the on / off of the circulating water.

7. The battery thermal management system according to claim 1, characterized in that The battery thermal management system further includes: A cooling circuit (300), including a third heat exchanger (310), the third heat exchanger (310) is connected in series with the electric heating element (110) and is used to cool the coolant of the power battery (10).

8. The battery thermal management system according to claim 7, wherein, The cooling circuit (300) further includes: A compressor (320), a condenser (330) and an electronic expansion valve (340), the compressor (320), the condenser (330), the electronic expansion valve (340) and the third heat exchanger (310) are connected in series in sequence; wherein, the condenser (330) is configured with a cooling fan (331).

9. The battery thermal management system according to claim 7, characterized in that The battery thermal management system further includes: A controller, electrically connected to the electric heating circuit (100), the waste heat heating circuit (200) and the cooling circuit (300).

10. A vehicle, characterized in that, It includes: The vehicle thermal management system according to any one of claims 1 to 9.

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