Automobile battery thermal management system, control method and automobile

Abstract

The application relates to the technical field of automobile battery thermal management, and provides an automobile battery thermal management system, a control method and an automobile. The system comprises a battery pack, a first heater, a first three-way valve and a low-temperature radiator. The first heater is communicated with one end of the battery pack through a first pipeline, and a first stop valve is arranged on the first pipeline. The water inlet of the first three-way valve is communicated with the other end of the battery pack, and the water inlet of the first three-way valve is also communicated with the first pipeline through a second pipeline, and a second stop valve is arranged on the second pipeline. The first end of the low-temperature radiator is communicated with the first water outlet of the first three-way valve, the second end of the low-temperature radiator is communicated with the other end of the first heater, and the second water outlet of the first three-way valve is communicated with the other end of the first heater. The automobile battery thermal management system provided by the application can make the cooling liquid enter the low-temperature radiator and be cooled if the temperature of the first heater is too high, and the cooled cooling liquid can cool and lower the temperature of the first heater, thereby preventing the first heater from being out of work due to the excessively high temperature.

Description

Technical Field

[0001] This application relates to the field of automotive battery thermal management technology, and more specifically, to an electric vehicle battery thermal management system, system, and vehicle. Background Technology

[0002] Currently, electric vehicles commonly use heaters to heat the coolant, thereby providing heat to the passenger compartment or the battery pack. For example, high-voltage electric heaters or fuel heaters are used to heat the coolant. Due to the operating characteristics of the high-voltage electric heater components, occasional IGBT (insulated gate bipolar transistor) short-circuit faults, insulation faults, or other malfunctions can occur during the heating process, leading to excessively high temperatures in the internal components and the internal outlet water temperature. If not addressed promptly, in severe cases, the excessively high temperature of the internal components can cause the high-voltage electric heater assembly casing to melt, and the excessively high water temperature inside the heater can cause the surrounding rubber or nylon water pipes to melt, significantly increasing customer complaints and vehicle after-sales maintenance costs.

[0003] Fuel heaters are used to provide heat to the passenger compartment or battery pack. During the use of fuel heaters, if there is insufficient coolant in the water circulation of the fuel heater or other malfunctions, the temperature of certain local areas of the heat exchange water jacket inside the fuel heater may become too high. This may melt the metal in that local area of ​​the water jacket and cause perforation of the water jacket. This will cause the fuel heater to malfunction, severely shorten the service life of the parts, and greatly increase user complaints and vehicle after-sales maintenance costs.

[0004] Therefore, it is necessary to improve the system to address the potential malfunctions that may occur in the above scenarios where a heater is used to heat the coolant. Summary of the Invention

[0005] This application addresses the shortcomings of existing methods by proposing an electric vehicle battery thermal management system, control method, and vehicle to solve the problem of malfunctions caused by excessively high temperatures during the heating process of the heater for the coolant in the prior art.

[0006] In a first aspect, embodiments of this application provide an automotive battery thermal management system, comprising:

[0007] Battery pack;

[0008] A first heater, one end of which is connected to one end of the battery pack via a first pipe, and a first shut-off valve is provided on the first pipe;

[0009] a first three-way valve, a water inlet of the first three-way valve being communicated with the other end of the battery pack, the water inlet of the first three-way valve being further communicated with the first pipeline through a second pipeline, the second pipeline being communicated with the first pipeline between the first heater and the first stop valve, and a second stop valve being arranged on the second pipeline;

[0010] a low-temperature radiator, a first end of the low-temperature radiator being communicated with a first water outlet of the first three-way valve, a second end of the low-temperature radiator being communicated with the other end of the first heater, and a second water outlet of the first three-way valve being communicated with the other end of the first heater.

[0011] Optionally, the automobile battery thermal management system further comprises:

[0012] a second heater, the second heater being arranged in parallel with the first heater, one end of the second heater being communicated with the part of the first pipeline between the first heater and the first stop valve;

[0013] a second three-way valve, a water inlet of the second three-way valve being communicated with the second water outlet of the first three-way valve and the second end of the low-temperature radiator respectively, a first water outlet of the second three-way valve being communicated with the other end of the first heater, and a second water outlet of the second three-way valve being communicated with the other end of the second heater.

[0014] Optionally, the first heater is a high-voltage electric heater, and the second heater is a fuel heater.

[0015] Optionally, the automobile battery thermal management system further comprises a battery cooler, the battery cooler being arranged between the second water outlet of the first three-way valve and the water inlet of the second three-way valve, and the battery cooler being used for cooling the coolant.

[0016] Optionally, the automobile battery thermal management system further comprises a water pump, the water pump being arranged between the battery pack and the water inlet of the first three-way valve, and the water pump being used for driving the coolant to flow.

[0017] In a second aspect, the embodiments of the present application further provide an automobile comprising the automobile battery thermal management system in the first aspect.

[0018] In a third aspect, the embodiments of the present application further provide a control method of an automobile battery thermal management system, comprising:

[0019] detecting the internal part temperature of the first heater, the internal outlet liquid temperature, and detecting whether the first heater has a fault;

[0020] When the internal part temperature is greater than or equal to a first preset value, or the internal outlet liquid temperature is greater than a second preset value, or the first heater has a fault, the first heater is controlled to stop working, the first stop valve is controlled to close, the second stop valve is controlled to open, and the water inlet and the first water outlet of the first three-way valve are controlled to open, and the second water outlet is controlled to close.

[0021] Optionally, when the internal part temperature is less than or equal to a third preset value, or the internal outlet liquid temperature is less than or equal to a fourth preset value, the method further comprises:

[0022] The first heater is controlled to start working, the first stop valve is controlled to open, the second stop valve is controlled to close, the water inlet and the second water outlet of the first three-way valve are controlled to open, and the first water outlet is controlled to close.

[0023] Optionally, when the automobile battery thermal management system comprises a second heater and a second three-way valve, the method further comprises:

[0024] The maximum temperature of an internal heat exchange water jacket of the second heater is detected;

[0025] When the maximum temperature is greater than or equal to a first set value, the second heater is controlled to stop working, and the water inlet and the second water outlet of the second three-way valve are controlled to open, and the first water outlet is controlled to close.

[0026] Optionally, when the maximum temperature is less than or equal to a second set value, the method further comprises:

[0027] The second heater is controlled to start working, the first stop valve is controlled to open, the second stop valve is controlled to close, the water inlet and the second water outlet of the first three-way valve are controlled to open, and the first water outlet is controlled to close.

[0028] The application has the beneficial technical effects that:

[0029] The automobile battery thermal management system provided by the embodiment of the application comprises a first stop valve, a second stop valve and a low-temperature radiator. When the first heater is used for a long time and its temperature is too high, the first stop valve is closed, the second stop valve is opened, and the first heater is stopped. The cooling liquid enters the low-temperature radiator through the first water outlet of the first three-way valve, the low-temperature radiator cools the cooling liquid, the temperature of the cooled cooling liquid is reduced, and the cooled cooling liquid enters the first heater to cool the first heater, thereby preventing the first heater from being overheated and causing a working fault.

[0030] The control method of the automobile battery thermal management system provided by the embodiment of the application comprises the following steps: detecting the internal part temperature of the first heater, the internal outlet liquid temperature, and whether the first heater has a fault; when the internal part temperature is greater than or equal to a first preset value, or the internal outlet liquid temperature is greater than a second preset value, or the first heater has a fault, the first heater is controlled to stop working, the first stop valve is controlled to be closed, the second stop valve is controlled to be opened, the water inlet and the first water outlet of the first three-way valve are controlled to be opened, and the second water outlet is controlled to be closed; through the control method, when the first heater has an extreme over-temperature risk, the first heater is controlled to stop working, and a heat protection working mode of the first heater is started, that is, the low-temperature radiator is used to reduce the cooling liquid temperature flowing into the first heater, and the first heater is protected.

[0031] Additional aspects and advantages of the application will be set forth in part in the following description, will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or additional aspects and advantages of the application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0033] Figure 1 A structural schematic diagram of an automobile battery thermal management system according to an embodiment of the application;

[0034] Figure 2 A structural schematic diagram of another automobile battery thermal management system according to an embodiment of the application;

[0035] Figure 3 A structural schematic diagram of another automobile battery thermal management system according to an embodiment of the application;

[0036] Figure 4 A flowchart of a control method of an automobile battery thermal management system according to an embodiment of the application;

[0037] Figure 5 A flowchart of another control method of an automobile battery thermal management system according to an embodiment of the application;

[0038] Legend: 1-battery pack; 2-first heater; 3-first pipeline; 4-first stop valve; 5-first three-way valve; 6-second pipeline; 7-second stop valve; 8-low-temperature radiator; 9-second heater; 10-second three-way valve; 11-battery cooler; 12-water pump. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explanation, and are not to be construed as limiting the present application.

[0040] As Figures 1-3 shown, the embodiments of the present application provide a car battery thermal management system, comprising:

[0041] The battery pack 1 is a combination formed by connecting a plurality of battery monomers in series and parallel through mechanical structure;

[0042] The first heater 2 is connected to one end of the battery pack 1 through the first pipeline 3, and the first pipeline 3 is provided with the first stop valve 4. In the working process, the cooling liquid flows through the first pipeline 3, and the cooling liquid is heated by the first heater 2. The heated cooling liquid flows into the battery pack 1 through the first stop valve 4, and heats the battery pack 1 to provide heat for the battery pack 1;

[0043] The first three-way valve 5 is provided with a water inlet and two water outlets. The water inlet a1 of the first three-way valve 5 is connected to the other end of the battery pack 1, and the water inlet a1 of the first three-way valve 5 is also connected to the first pipeline 3 through the second pipeline 6. The connection position of the second pipeline 6 and the first pipeline 3 is between the first heater 2 and the first stop valve 4, and the second pipeline 6 is provided with the second stop valve 7;

[0044] The low-temperature radiator 8 can be used to cool the cooling liquid. The first end of the low-temperature radiator 8 is connected to the first water outlet b1 of the first three-way valve 5, and the second end is connected to the other end of the first heater 2. Specifically, the two ends of the low-temperature radiator 8 can be connected to the other end of the first heater 2 and the first water outlet b1 of the first three-way valve 5 through pipelines respectively. The second water outlet c1 of the first three-way valve 5 is connected to the other end of the first heater 2. Obviously, in actual use, the second water outlet c1 of the first three-way valve 5 can be connected to the other end of the first heater 2 through a pipeline.

[0045] The first heater 2 can be a high-voltage electric heater or a fuel heater, both of which are prior art and their specific structures are not described here. Obviously, other heaters that can heat the coolant are also feasible. In use, the first stop valve 4 can be opened, the second stop valve 7 can be closed, the first pipeline 3 can circulate the coolant, the coolant can be heated by the first heater 2, the heated coolant can flow into the battery pack 1 through the first stop valve 4 and heat the battery pack 1, and then the coolant can return to the first heater 2 through the water inlet a1 of the first three-way valve 5 and the second water outlet c1 of the first three-way valve 5 to heat the coolant again and enter the battery pack 1 again, and the cycle is repeated.

[0046] If the first heater 2 works for a long time and the temperature of the first heater 2 is too high, the controller can control the first stop valve 4 to be closed and the second stop valve 7 to be opened, and the first heater 2 to be stopped. Specifically, the controller is electrically connected with the first heater 2, the first stop valve 4 and the second stop valve 7 to control the first heater 2, the first stop valve 4 and the second stop valve 7. At this time, the coolant enters the low-temperature radiator 8 through the first water outlet b1 of the first three-way valve 5, the low-temperature radiator 8 cools the coolant, the cooled coolant is lowered in temperature and enters the first heater 2 to cool the first heater 2, thereby preventing the first heater 2 from being damaged due to high temperature. The cooled coolant flows into the low-temperature radiator 8 again through the first water outlet b1 of the first three-way valve 5, and the cycle is repeated. Obviously, in actual use, the coolant can also be cooled by the low-temperature radiator 8, and the coolant enters the battery pack 1 through the first stop valve 4 to cool the battery pack 1. That is, the low-temperature radiator 8 also functions as a battery cooling device. This application scenario is when the ambient temperature is not very high and the temperature of the battery pack 1 is not very high.

[0047] The electric vehicle battery thermal management system described above can cool the coolant by the low-temperature radiator 8 when the temperature of the first heater 2 is too high, and further cool the first heater 2. In this way, the first heater 2 can be prevented from being damaged due to continued operation.

[0048] In some embodiments, as shown in Figure 2 The automobile battery thermal management system further comprises:

[0049] The second heater 9 is arranged in parallel with the first heater 2. Obviously, the second heater 9 is also used to heat the coolant. One end of the second heater 9 is in communication with the part of the first pipeline 3 between the first heater 2 and the first stop valve 4.

[0050] The second three-way valve 10, the water inlet a2 of the second three-way valve 10 is communicated with the second water outlet c1 of the first three-way valve 5 and the second end of the low-temperature radiator 8 respectively, the first water outlet b2 of the second three-way valve 10 is communicated with the other end of the first heater 2, and the second water outlet c2 of the second three-way valve 10 is communicated with the other end of the second heater 9.

[0051] The automobile battery thermal management system described above, in working, one of the second heater 9 or the first heater 2 is normally started, if the first heater 2 is started to work, the heated cooling liquid flows into the battery pack 1 through the first stop valve 4 and heats the battery pack 1, then the cooling liquid returns to the first heater 2 through the water inlet a1 of the first three-way valve 5, the second water outlet c1 of the first three-way valve 5, the water inlet a2 of the second three-way valve 10, the first water outlet b2 of the second three-way valve 10, is heated again, and enters the battery pack 1 again, and so on.

[0052] If the first heater 2 works for a long time and the temperature of the first heater 2 is too high, at this time, the first stop valve 4 can be closed, the second stop valve 7 is started, and the first heater 2 is stopped to work, the cooling liquid enters the low-temperature radiator 8 through the first water outlet b1 of the first three-way valve 5 and is cooled, the cooled cooling liquid is lowered in temperature and enters the first heater 2 through the water inlet a2 of the second three-way valve 10 and the first water outlet b2 of the second three-way valve 10, and the first heater 2 is cooled and lowered in temperature, thereby preventing the first heater 2 from working failure due to too high temperature.

[0053] If the second heater 9 is started to work, the first stop valve 4 is opened, the second stop valve 7 is closed, the cooling liquid heated by the second heater 9 enters the battery pack 1 through the first stop valve 4 and heats the battery pack 1, then the cooling liquid returns to the second heater 9 through the water inlet a1 of the first three-way valve 5, the second water outlet c1 of the first three-way valve 5, the water inlet a2 of the second three-way valve 10, and the second water outlet c2 of the second three-way valve 10, is heated again, and enters the battery pack 1 again, and so on.

[0054] If the second heater 9 works for a long time and the temperature of the second heater 9 is too high, at this time, the first stop valve 4 can be closed, the second stop valve 7 is opened, and the second heater 9 is stopped to work, the cooling liquid flows into the low-temperature radiator 8 through the first outlet b1 of the first three-way valve 5 and cools the cooling liquid, the cooled cooling liquid returns to the second heater 9 through the water inlet a2 of the second three-way valve 10 and the second outlet c2 of the second three-way valve 10, and cools the second heater 9, thereby preventing the second heater 9 from being damaged due to the temperature being too high and continuing to work, and the cooled cooling liquid flows into the low-temperature radiator 8 through the first outlet b1 of the first three-way valve 5 again, and the cycle is repeated. The above-mentioned electric vehicle battery thermal management system cools the cooling liquid through the low-temperature radiator 8 when the temperature of the second heater 9 is too high, and further cools the second heater 9, so that the second heater 9 can be prevented from being damaged due to continuous operation.

[0055] In some embodiments, the first heater 2 is a high-voltage electric heater, and the second heater 9 is a fuel heater.

[0056] In some embodiments, as shown in Figure 3 The automobile battery thermal management system further includes a battery cooler 11 for cooling the cooling liquid. The battery cooler 11 uses existing technology, and specifically includes high and low pressure refrigerant pipes. By introducing refrigerant into the pipes, the cooling liquid flowing through the pipes can be cooled. Specifically, the battery cooler 11 is located between the second outlet c1 of the first three-way valve 5 and the water inlet a2 of the second three-way valve 10. In practice, a pipe can be arranged between the second outlet c1 of the first three-way valve 5 and the water inlet a2 of the second three-way valve 10, and the battery cooler 11 is arranged on the pipe. In specific use, the first heater 2 and the second heater 9 can be controlled to stop working according to specific use. At this time, the battery cooler 11 cools the cooling liquid, and then cools the battery pack 1.

[0057] In some embodiments, as shown in Figure 3 The automobile battery thermal management system further includes a water pump 12 located between the battery pack 1 and the water inlet a1 of the first three-way valve 5. When the water pump 12 is turned on, the water pump 12 can drive the cooling liquid to flow, thereby providing power for the flow of the cooling liquid.

[0058] Based on the same inventive concept, the embodiments of the present application also provide an automobile including the automobile battery thermal management system in the above-mentioned embodiments. Since the automobile includes the automobile battery thermal management system, the damage of the heater due to the temperature being too high and continuing to work in the prior art is avoided, and the safety of the automobile is improved.

[0059] Based on the same inventive concept, as shown in Figures 4-5As shown, the embodiments of the present application also provide a control method of the automobile battery thermal management system, comprising:

[0060] S11, detecting the internal part temperature of the first heater 2, the internal outlet liquid temperature, and detecting whether the first heater 2 has a fault; specifically, the internal part temperature of the first heater 2 and the internal outlet liquid temperature can be detected by a temperature sensor;

[0061] S12, when the internal part temperature is greater than or equal to a first preset value, or the internal outlet liquid temperature is greater than a second preset value, or the first heater has a fault, controlling the first heater 2 to stop working, controlling the first stop valve 4 to close, controlling the second stop valve 7 to open, controlling the water inlet a1 and the first water outlet b1 of the first three-way valve 5 to open, and the second water outlet c1 to close.

[0062] Specifically, in combination with Figures 1-3 As shown, the following is described by taking a high-voltage electric heater as an example. For example, the internal part temperature of the high-voltage electric heater and the internal outlet liquid temperature of the high-voltage electric heater are detected by a thermal management controller. When it is detected that the internal part temperature of the high-voltage electric heater is greater than or equal to a first preset value, such as 100℃, or the internal outlet liquid temperature of the high-voltage electric heater is greater than a second preset value, such as 90℃, at this time, it can be considered that the high-voltage electric heater has an extreme over-temperature risk. At this time, the thermal management controller can be used to control the high-voltage electric heater to stop working, control the first stop valve 4 to close, control the second stop valve 7 to open, control the water inlet a1 and the first water outlet b1 of the first three-way valve 5 to open, and the second water outlet c1 to close. The high-voltage electric heater starts the thermal protection working mode, that is, the low-temperature radiator 8 is used to reduce the temperature of the cooling liquid flowing into the high-voltage electric heater, and the high-temperature liquid inside the high-voltage electric heater is directly taken away and cooled, so as to quickly reduce the internal part temperature or the internal outlet liquid temperature of the high-voltage electric heater. In this way, the melting of the high-voltage electric heater shell or the melting of the rubber or nylon material of the water pipe around the high-voltage electric heater can be avoided, and the high-voltage electric heater cannot work. At the same time, the above method can prevent the cooling liquid from entering the inside of the battery pack, causing the increase of the uneven temperature difference of the battery pack.

[0063] Further, the above method also detects whether the high-voltage electric heater has a fault, and specifically, the monitoring method can be realized by the prior art, such as detecting the IGBT short-circuit fault signal or the insulation fault signal of the high-voltage electric heater by the thermal management controller to determine whether the high-voltage electric heater has a fault. When it is detected that the high-voltage electric heater has a fault, the high-voltage electric heater starts the thermal protection working mode. At this time, the thermal management controller controls the high-voltage electric heater to stop working, controls the first stop valve 4 to be closed, controls the second stop valve 7 to be opened, and controls the water inlet a1 and the first water outlet b1 of the first three-way valve 5 to be opened and the second water outlet c1 to be closed. In this way, when the high-voltage electric heater has a fault, the low-temperature radiator 8 is also used to reduce the temperature of the cooling liquid flowing into the high-voltage electric heater, so as to prevent the temperature of the internal parts of the high-voltage electric heater or the temperature of the internal outlet liquid from being too high.

[0064] In some embodiments, as shown in FIG. 1, Figure 5 the method further comprises:

[0065] S21, detecting the internal part temperature and the internal outlet liquid temperature of the first heater;

[0066] S22, when the internal part temperature is less than or equal to a third preset value or the internal outlet liquid temperature is less than or equal to a fourth preset value, controlling the first heater 2 to start working, and controlling the first stop valve 4 to be opened, the second stop valve 7 to be closed, the water inlet a1 and the second water outlet c1 of the first three-way valve 5 to be opened, and the first water outlet b1 to be closed. Specifically, taking the high-voltage electric heater as an example, if the thermal management controller detects that the internal part temperature of the high-voltage electric heater is less than or equal to 70℃ or the internal outlet liquid temperature of the high-voltage electric heater is less than or equal to 70℃, obviously, the specific temperature value can be set according to the actual use condition. At this time, it can be considered that the high-voltage electric heater does not have an over-temperature risk. At this time, the thermal protection working mode of the high-voltage electric heater is stopped, and the high-voltage electric heater can be controlled to start heating the cooling liquid and heating the battery pack 1 according to the battery heating demand to provide heat for the battery pack 1.

[0067] Similarly, if a high-voltage electric heater is detected to have a fault and starts the thermal protection mode, if the internal part temperature is less than or equal to 70℃, or the internal outlet liquid temperature is less than or equal to 70℃, and the internal part temperature or the internal outlet liquid temperature does not exceed 70℃ for a period of time, such as 30s, the high-voltage electric heater thermal protection mode can be ended at this time. Since the high-voltage electric heater has failed, the second heater 9 can be controlled according to the actual use at this time. If no fault is detected in the high-voltage electric heater at this time, the internal part temperature of the high-voltage electric heater is detected according to the above method whether it is less than or equal to the third preset value, or the temperature is greater than or equal to the first preset value, or the internal outlet liquid temperature is less than or equal to the fourth preset value, or the internal outlet liquid temperature is greater than the second preset value, and the working mode of the high-voltage electric heater is controlled according to the above method.

[0068] In some embodiments, when the automobile battery thermal management system includes a second heater 9 and a second three-way valve 10, the second heater 9 in the embodiment of the application is taken as an example for description, and the method further includes:

[0069] S31, detecting the maximum temperature of the internal heat exchange water jacket of the second heater 9;

[0070] S32, when the maximum temperature is greater than or equal to the first set value, the second heater 9 is controlled to stop working, and the water inlet a2 and the second water outlet c2 of the second three-way valve 10 are controlled to be opened, and the first water outlet b2 is controlled to be closed.

[0071] Specifically, in combination with Figure 2 and Figure 3As shown, when the heat management controller detects that the maximum temperature of the internal heat exchange water jacket of the fuel heater is greater than or equal to the first set value, for example, the maximum temperature is greater than or equal to 105℃, at this time, it is judged that the internal heat exchange water jacket of the fuel heater has an extreme melting perforation risk caused by overheating, at this time, the fuel heater thermal protection working mode is started, specifically, the heat management controller controls the fuel heater to stop working, at the same time, the heat management controller controls the first stop valve 4 to close, controls the second stop valve 7 to open, controls the water inlet a2 and the second water outlet c2 of the second three-way valve 10 to open, and the first water outlet b2 to close, the cooling liquid enters the low-temperature radiator 8 through the first water inlet b1 of the first three-way valve 5 and is cooled, and the cooled cooling liquid temperature is lowered and returns to the fuel heater through the water inlet a2 of the second three-way valve 10 and the second water outlet c2 of the second three-way valve 10, the cooling liquid flowing into the fuel heater is cooled by the low-temperature radiator 8, and the high-temperature liquid in the fuel heater is directly taken away and cooled, so as to quickly reduce the temperature of the internal heat exchange water jacket of the fuel heater. Specifically, the maximum temperature of the above-mentioned internal heat exchange water jacket of the fuel heater can be the maximum value of the values collected by the four temperature sensors uniformly distributed in the circumferential direction of the heat exchange water jacket.

[0072] In some embodiments, when the maximum temperature is less than or equal to the second set value, the method further comprises:

[0073] controlling the second heater 9 to start working, and controlling the first stop valve 4 to open, controlling the second stop valve 7 to close, controlling the water inlet a1 and the second water outlet c1 of the first three-way valve 5 to open, and the first water outlet b1 to close.

[0074] Specifically, taking the second heater 9 as the fuel heater as an example, when the heat management controller detects that the maximum temperature of the internal heat exchange water jacket of the fuel heater is less than or equal to the second set value, for example, the maximum temperature is less than or equal to 75℃, at this time, it is judged that the internal heat exchange water jacket of the fuel heater does not have an overheating risk, at this time, the fuel heater thermal protection working mode is stopped, and the fuel heater is started to heat the cooling liquid according to the battery heating demand, and the battery pack 1 is heated to provide heat for the battery pack 1.

[0075] In summary, the electric vehicle battery thermal management system, the control method and the automobile provided by the application have the following beneficial effects:

[0076] 1. The automobile battery thermal management system provided by the embodiment of the application, by setting the first stop valve, the second stop valve and the low-temperature radiator, when the first heater works for a long time and its temperature is too high, at this time, the first stop valve can be closed, the second stop valve can be opened, and the first heater can be stopped, the cooling liquid enters the low-temperature radiator through the first outlet of the first three-way valve, the low-temperature radiator can cool the cooling liquid, the cooled cooling liquid with a reduced temperature enters the first heater, and the first heater is cooled, thereby preventing the first heater from working abnormally due to the excessively high temperature.

[0077] 2. The automobile battery thermal management system provided by the embodiment of the application, further comprising a second heater and a second three-way valve, when the second heater works for a long time and its temperature is too high, at this time, the first stop valve can be closed, the second stop valve can be opened, and the second heater can be stopped, the cooling liquid enters the low-temperature radiator through the first outlet of the first three-way valve and is cooled, the cooled cooling liquid with a reduced temperature enters the second heater through the inlet of the second three-way valve and the second outlet of the second three-way valve, and the second heater is cooled, thereby preventing the second heater from working abnormally due to the excessively high temperature.

[0078] 3. The automobile battery thermal management system provided by the embodiment of the application, further comprising a battery cooler, in specific use, the first heater and the second heater can be controlled to stop working, at this time, the battery cooler cools the cooling liquid, and then the cooling liquid enters the battery pack to cool and lower the temperature of the battery pack.

[0079] 4. The automobile battery thermal management system provided by the embodiment of the application, in specific use, the low-temperature radiator can directly cool and lower the temperature of the battery pack, so that the low-temperature radiator can be used not only when the first heater or the second heater works under the over-temperature condition, but also when the battery pack needs to be cooled, thereby increasing the use condition of the low-temperature radiator.

[0080] 5. The control method of the automobile battery thermal management system provided by the embodiment of the application, the internal part temperature of the first heater, the outlet liquid temperature and whether the first heater has a fault are detected, when the internal part temperature is greater than or equal to a first preset value, or the outlet liquid temperature is greater than a second preset value, or the first heater has a fault, the first heater is controlled to stop working, the first stop valve is controlled to close, the second stop valve is controlled to open, the inlet and the first outlet of the first three-way valve are controlled to open, and the second outlet is controlled to close, by the control method, when the first heater has an extreme over-temperature risk, the first heater is controlled to stop working, and the first heater is started to work in the thermal protection mode, that is, the low-temperature radiator is used to reduce the temperature of the cooling liquid flowing into the first heater, thereby protecting the first heater.

[0081] 6. The control method of the automobile battery thermal management system provided by the embodiment of the application, the maximum temperature of the internal heat exchange water jacket of the second heater is detected; when the maximum temperature is greater than or equal to a first set value, the second heater is controlled to stop working, the water inlet and the second water outlet of the second three-way valve are controlled to be opened, and the first water outlet is controlled to be closed; through the control method, when the second heater has an extreme melting perforation risk caused by over-temperature, the fuel heater thermal protection working mode is started at this time, and the second heater is protected.

[0082] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the phrase "comprising" used in the specification of the application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0083] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art to which the application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0084] Those skilled in the art can understand that each block in the structural diagram and / or block diagram and / or flowchart and the combination of blocks in the structural diagram and / or block diagram and / or flowchart can be implemented by computer program instructions. Those skilled in the art can understand that these computer program instructions can be provided to a general-purpose computer, a professional computer or a processor of other programmable data processing method to implement, so as to execute the scheme specified in the block or blocks of the structural diagram and / or block diagram and / or flowchart disclosed in the application by the computer or the processor of other programmable data processing method.

[0085] Those skilled in the art can understand that the steps, measures and schemes in the various operations, methods and processes discussed in the present application can be alternated, changed, combined or deleted. Further, other steps, measures and schemes in the various operations, methods and processes discussed in the present application can also be alternated, changed, rearranged, decomposed, combined or deleted. Further, the steps, measures and schemes in the various operations, methods and processes in the prior art can also be alternated, changed, rearranged, decomposed, combined or deleted.

[0086] The above only describes some embodiments of the present application. It should be pointed out that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A thermal management system for automotive batteries, characterized in that, include: Battery pack; A first heater, one end of which is connected to one end of the battery pack via a first pipe, and a first shut-off valve is provided on the first pipe; The first three-way valve has its inlet connected to the other end of the battery pack. The inlet of the first three-way valve is also connected to the first pipe through a second pipe. The connection point between the second pipe and the first pipe is located between the first heater and the first shut-off valve, and a second shut-off valve is provided on the second pipe. A low-temperature radiator, wherein the first end of the low-temperature radiator is connected to the first outlet of the first three-way valve; A second heater is connected in parallel with the first heater, and one end of the second heater is connected to the portion of the first pipe located between the first heater and the first shut-off valve. The inlet of the second three-way valve is connected to the second outlet of the first three-way valve and the second end of the low-temperature radiator, respectively. The first outlet of the second three-way valve is connected to the other end of the first heater, and the second outlet of the second three-way valve is connected to the other end of the second heater.

2. The automotive battery thermal management system according to claim 1, characterized in that, The first heater is a high-voltage electric heater, and the second heater is a fuel oil heater.

3. The automotive battery thermal management system according to claim 1, characterized in that, It also includes a battery cooler, which is located between the second outlet of the first three-way valve and the inlet of the second three-way valve, and is used to cool the coolant.

4. The automotive battery thermal management system according to claim 1, characterized in that, It also includes a water pump located between the battery pack and the inlet of the first three-way valve, for driving the flow of coolant.

5. A car, characterized in that, Including the automotive battery thermal management system as described in any one of claims 1-4.

6. A control method for an automotive battery thermal management system as described in any one of claims 1-4, characterized in that, include: The temperature of the internal components of the first heater, the temperature of the liquid at the internal outlet, and whether the first heater is faulty are detected. When the temperature of the internal parts is greater than or equal to the first preset value, or the temperature of the internal outlet liquid is greater than the second preset value, or the first heater malfunctions, the first heater is controlled to stop working, the first shut-off valve is controlled to close, the second shut-off valve is controlled to open, and the inlet and outlet of the first three-way valve are controlled to open, while the second outlet is controlled to close. Detect the maximum temperature of the internal heat exchange water jacket of the second heater; When the maximum temperature is greater than or equal to the first set value, the second heater is controlled to stop working, and the inlet and outlet of the second three-way valve are controlled to open, while the first outlet is closed.

7. The control method for the automotive battery thermal management system according to claim 6, characterized in that, When the temperature of the internal component is less than or equal to a third preset value, or the temperature of the internal outlet liquid is less than or equal to a fourth preset value, the method further includes: The system controls the first heater to start working, controls the first shut-off valve to open, controls the second shut-off valve to close, controls the inlet and second outlet of the first three-way valve to open, and controls the first outlet to close.

8. The control method for the automotive battery thermal management system according to claim 6, characterized in that, When the maximum temperature is less than or equal to the second set value, the method further includes: The system controls the second heater to start working, controls the first shut-off valve to open, controls the second shut-off valve to close, controls the inlet and second outlet of the first three-way valve to open, and controls the first outlet to close.

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