Thermal management system based on multi-ported valve and control method thereof

Abstract

The invention discloses a heat management system based on a multi-way valve and a control method thereof. The heat management system comprises the multi-way valve, a first water pump, a second water pump, an electric drive module, a radiator, a battery pack and a cooler. The inlet end of the electric drive module, the outlet end of the radiator, the connecting end of the outlet end of the electric drive module and the inlet end of the radiator, the inlet end of the battery pack, the outlet end of the cooler, the inlet end of the cooler and the outlet end of the battery pack are sequentially connected with a first interface, a second interface, a third interface, a fourth interface, a fifth interface and a sixth interface of the multi-way valve; the first water pump is fixedly connected and communicated with the electric drive module, and the second water pump is fixedly connected and communicated with the battery pack; the execution modes of the multi-way valve at least comprise a first mode; in the first mode, the first valve clack communicates with the second valve clack, and the seventh valve clack communicates with the fourth valve clack. According to the invention, real self-circulation of the battery pack is realized, extra flow resistance and heat loss are not generated, and energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of thermal management systems for electric vehicles, and in particular, to a thermal management system based on a multi-way valve and a control method thereof. Background Art

[0002] With the continuous development of new energy vehicles, thermal management systems have become more and more complex. Thermal management systems often use three-way valves, four-way valves or other water valve combinations to achieve switching between different pipelines. However, multiple water valves lead to multiple water pipe interfaces, complex pipeline connections, and cumbersome corresponding control logic. In addition, the combination of multiple water valves will also lead to a larger overall mass of the thermal management system and a larger assembly space.

[0003] The US patent with publication number US20190070924A1 discloses an electric vehicle heat pump system with extreme temperature heating capability and effective thermal pretreatment. The integrated design of the eight-way valve is used to realize the integration of the thermal management system, which helps to reduce costs, reduce weight and reduce assembly space. Among them, the integrated components mainly include: water pump, eight-way valve, battery cooler, liquid-cooled condenser, coolant flow channel plate, refrigerant flow channel plate, etc. On the coolant side, it is connected to nine interfaces through the eight-way valve to realize the switching of various thermal management modes, which helps to reduce the energy consumption of the thermal management system. However, in this patent, the battery cannot achieve true self-circulation. When the battery is self-circulating, it must flow through the battery cooler, resulting in additional flow resistance and heat loss; and under the heat pump working condition, it is impossible to absorb the waste heat of the electric drive alone, and it is necessary to absorb heat from the battery and the electric drive at the same time, which easily causes the battery temperature to be too low. Summary of the invention

[0004] To solve at least one aspect of the above problems, the present invention provides a thermal management system based on a multi-way valve, including a multi-way valve, a first water pump, a second water pump, an electric drive module, a radiator, a battery pack and a cooler; the multi-way valve at least includes a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface and a first valve flap, a second valve flap, a third valve flap, a fourth valve flap, a fifth valve flap, a sixth valve flap and a seventh valve flap corresponding thereto; the electric drive module has an active heating function, or the electric drive module does not have an active heating function, and the battery pack or the cooler is connected in series with a thermistor; the inlet end of the electric drive module is fixedly connected and communicated with the first interface, the outlet end of the electric drive module, the inlet end of the radiator and the third interface are fixedly connected and communicated, and the outlet end of the radiator The inlet end is fixedly connected and connected to the second interface; the inlet end of the radiator is used to be fixedly connected and connected to the exhaust end of the balancing tank; the first water pump is fixedly connected and connected to the inlet end or the outlet end of the electric drive module, and the inlet end of the first water pump is used to be fixedly connected and connected to the replenishing end of the balancing tank; the inlet end of the battery pack is fixedly connected and connected to the fourth interface, and the outlet end of the battery pack is fixedly connected and connected to the seventh interface; the second water pump is fixedly connected and connected to the inlet end or the outlet end of the battery pack, and the inlet end of the second water pump is used to be fixedly connected and connected to the replenishing end of the balancing tank; the inlet end of the cooler is fixedly connected and connected to the sixth interface, and the outlet end of the cooler is fixedly connected and connected to the fifth interface; the execution mode of the multi-way valve includes at least the first mode; the first mode is that the first valve flap is connected to the second valve flap, and the seventh valve flap is connected to the fourth valve flap.

[0005] Through the above technical solution, the inlet end of the electric drive module, the outlet end of the radiator, the connection end between the outlet end of the electric drive module and the inlet end of the radiator, the inlet end and outlet end of the battery pack, and the inlet end and outlet end of the cooler are respectively connected to the various interfaces of the multi-way valve, and integrated into the thermal management system of the present application; when the multi-way valve executes the first mode, the electric drive module and the radiator are connected in series to form a loop to cool the electric drive module, the cooler does not work, and the battery pack itself forms a loop to achieve true self-circulation, which does not generate additional flow resistance and heat loss, and helps to reduce energy consumption.

[0006] Preferably, a liquid-cooled condenser is connected between the electric drive module and the third interface. Through the above technical solution, the liquid-cooled condenser is integrated between the outlet end of the electric drive module and the third interface, so that in the air conditioning cooling mode, the heat in the refrigerant can be first transferred to the coolant through the liquid-cooled condenser, and then the coolant flows through the radiator and dissipates to the outside; in the heat pump heating battery mode, the refrigerant heat can first flow through the liquid-cooled condenser, and then the coolant is exchanged with the liquid-cooled condenser, and finally transferred to the battery pack.

[0007] Preferably, the execution mode includes a second mode, in which the third valve flap is connected to the sixth valve flap, the fifth valve flap is connected to the first valve flap, and the seventh valve flap is connected to the fourth valve flap. Through the above technical solution, when the multi-way valve executes the second mode, the electric drive module and the cooler are connected in series to form a loop to realize that the heat pump only absorbs heat from the electric drive, the radiator does not work, and the battery pack is self-circulating, which will not affect the temperature of the battery pack.

[0008] Preferably, the execution mode includes a third mode, in which the second valve flap is connected to the first valve flap, the seventh valve flap is connected to the sixth valve flap, and the fifth valve flap is connected to the fourth valve flap. Through the above technical solution, when the multi-way valve executes the third mode, the electric drive module and the radiator are connected in series to form a loop, and the battery pack and the cooler are connected in series to form a loop, so that water cooling of the electric drive module and cooling of the battery pack by the cooler are realized.

[0009] Preferably, the execution mode includes a fourth mode, in which the second valve flap is connected to the fourth valve flap, and the seventh valve flap is connected to the first valve flap. Through the above technical solution, when the multi-way valve executes the fourth mode, the electric drive module, the radiator and the battery pack are connected in series to form a loop, and the cooler does not work, thereby achieving water cooling of the electric drive module and the battery pack.

[0010] Preferably, the execution mode includes a fifth mode, in which the second valve flap is connected to the sixth valve flap, the fifth valve flap is connected to the first valve flap, and the seventh valve flap is connected to the fourth valve flap. Through the above technical solution, when the multi-way valve executes the fifth mode, the electric drive module, the radiator, and the cooler are connected in series to form a loop to realize the heat pump absorbing heat from the electric drive module and the environment, and the battery pack is self-circulating.

[0011] Preferably, the execution mode includes a sixth mode, in which the third valve flap is connected to the fourth valve flap, and the seventh valve flap is connected to the first valve flap. Through the above technical solution, when the multi-way valve executes the sixth mode, the electric drive module and the battery pack are connected in series to form a loop, the radiator and the cooler are closed, and when the electric drive module has an active heating function, the electric drive module directly heats the battery pack, or if the electric drive module does not have an active heating function, the waste heat of the electric drive module heats the battery pack.

[0012] Preferably, the execution mode includes a seventh mode, in which the third valve flap is connected to the first valve flap, the seventh valve flap is connected to the sixth valve flap, and the fifth valve flap is connected to the fourth valve flap. Through the above technical solution, when the multi-way valve executes the seventh mode, the electric drive module self-circulates, the radiator does not work, the battery pack and the cooler are connected in series to form a loop, so that the heat pump absorbs heat from the battery pack.

[0013] Preferably, the execution mode includes an eighth mode, in which the third valve flap is connected to the first valve flap, and the seventh valve flap is connected to the fourth valve flap. Through the above technical solution, when the multi-way valve executes the eighth mode, the electric drive module self-circulates, the radiator and the cooler do not work, and the battery pack self-circulates.

[0014] Preferably, it also includes a controller, which is electrically connected to the multi-way valve, for controlling the multi-way valve to switch the execution mode, and for being electrically connected to the battery controller, the vehicle controller, the ambient temperature sensor, the water temperature sensor, and the air-conditioning controller respectively.

[0015] The present application also provides a control method for a thermal management system based on a multi-way valve, which is applied to any of the above-mentioned thermal management systems based on a multi-way valve, and is characterized in that: the execution modes of the multi-way valve include a first mode, a second mode, a third mode, a fourth mode, a fifth mode, a sixth mode, a seventh mode and an eighth mode; and includes the following control steps:

[0016] Step 1: When the battery temperature is greater than the forced cooling temperature, the multi-way valve executes the third mode;

[0017] Step 2: When the battery temperature is lower than the natural cooling temperature and higher than the self-circulation temperature, the multi-way valve executes the first mode;

[0018] Step 3: When the battery pack does not need cooling or heating and the ambient temperature is greater than the minimum operating temperature of the heat pump, and the water temperature at the outlet of the electric drive module is greater than the ambient temperature, the multi-way valve executes the second mode;

[0019] Step 4: When the battery pack needs to be heated and the electric drive module has an active heating function, the multi-way valve executes the sixth mode; or when the electric drive module does not have an active heating function and a thermistor is connected in series with the battery pack, the multi-way valve executes the eighth mode, or when a thermistor is connected in series with the cooler, the multi-way valve executes the seventh mode.

[0020] Through the above technical solution, a control method for the above thermal management system is disclosed. According to different application scenarios, the multi-way valve is controlled to execute the corresponding execution mode, so that the cooling and heating in the heat pump system are fully utilized, which helps to reduce energy consumption.

[0021] Preferably, the thermal management system includes a liquid-cooled condenser; the control step further includes step 5: when the air-conditioning controller sends a radiator defrost signal, the multi-way valve executes the first mode.

[0022] Preferably, the control step further includes step 6: when the vehicle controller sends a long-term stay signal, the multi-way valve executes the sixth mode.

[0023] Preferably, the control step further includes step 7: when the air conditioning controller sends a passenger compartment defog signal, the multi-way valve executes the first mode.

[0024] Preferably, in step 4, the electric drive module does not have an active heating function, the battery pack or the cooler is connected in series with a thermistor, and when the water temperature in the electric drive module is higher than the water temperature in the battery pack, the multi-way valve executes the sixth mode.

[0025] Preferably, the control step further includes step 8: when the battery temperature is lower than the forced cooling temperature and higher than the natural cooling temperature, the multi-way valve executes the fourth mode.

[0026] Preferably, the control step also includes step 9: when the battery pack requires neither cooling nor heating and the ambient temperature is greater than the minimum operating temperature of the heat pump, and the water temperature at the outlet of the electric drive module is lower than the ambient temperature, the multi-way valve executes the fifth mode.

[0027] Preferably, the control step further includes step 10: when the battery controller sends a signal indicating that it is in an overcharge state and the air-conditioning controller sends a heating request, the multi-way valve executes the seventh mode.

[0028] Preferably, the control step further includes step 11: when the battery controller sends a heat storage signal, the multi-way valve executes the eighth mode.

[0029] A thermal management system based on a multi-way valve and a control method thereof of the present invention have the following beneficial effects:

[0030] The heat pump system of the present application realizes the integration of the thermal management system by connecting the inlet end of the electric drive module, the outlet end of the radiator, the connection end between the outlet end of the electric drive module and the inlet end of the radiator, the inlet end and outlet end of the battery pack, and the inlet end and outlet end of the cooler to the respective interfaces of the multi-way valve, and integrating a liquid-cooled condenser between the outlet end of the electric drive module and the third interface, which helps to reduce costs, reduce weight and reduce assembly space; by designing multiple execution modes of the multi-way valve, multiple connection modes of the electric drive module, the radiator, the cooler and the battery pack are realized, and in the first mode, true self-circulation of the battery pack itself is realized, and no additional flow resistance and heat loss are generated, which helps to reduce energy consumption; in the second mode, the heat pump only absorbs heat from the electric drive, and does not affect the temperature of the battery pack; the present application also provides a control method for the above-mentioned heat pump system, which controls the multi-way valve to execute the corresponding execution mode according to different application scenarios, so as to achieve the effect that both the cold and heat in the heat pump system are fully utilized, which helps to reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0032] Figure 1 A cross-sectional view of a multi-way valve based on a thermal management system according to an embodiment of the present invention is shown;

[0033] Figure 2 An axial diagram of a multi-way valve based on a thermal management system according to an embodiment of the present invention is shown;

[0034] Figure 3 A topological diagram of a thermal management system based on a multi-way valve according to a first embodiment of the present invention is shown;

[0035] Figure 4 A topological diagram showing an integrated electric drive module of a thermal management system based on a multi-way valve according to a first embodiment of the present invention;

[0036] Figure 5 A topological diagram of an oil-cooled motor of a thermal management system based on a multi-way valve according to a first embodiment of the present invention is shown;

[0037] Figure 6 A topological diagram of a battery pack connected to a thermistor of a thermal management system based on a multi-way valve according to a first embodiment of the present invention is shown;

[0038] Figure 7 A topological diagram showing a cooler connected to a thermistor of a thermal management system based on a multi-way valve according to a first embodiment of the present invention;

[0039] Figure 8 A topological diagram of a thermal management system based on a multi-way valve according to a second embodiment of the present invention is shown;

[0040] Fig. 9 A diagram showing an execution mode of a multi-way valve of a thermal management system based on a multi-way valve according to an embodiment of the present invention is shown.

[0041] Description of reference numerals:

[0042] 1. Multi-way valve; 2. First water pump; 3. Second water pump; 4. Electric drive module; 41. DC converter; 42. Charger; 43. Electronic control; 44. Motor; 45. Oil cooler; 5. Radiator; 6. Battery pack; 7. Cooler; 8. Liquid-cooled condenser; 9. Thermistor; 10. Balance tank. DETAILED DESCRIPTION

[0043] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0044] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0045] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure proposes a thermal management system based on a multi-way valve, including a multi-way valve 1, a first water pump 2, a second water pump 3, an electric drive module 4, a radiator 5, a battery pack 6 and a cooler 7; the multi-way valve 1 at least includes a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface and corresponding first valve flaps, second valve flaps, third valve flaps, fourth valve flaps, fifth valve flaps, sixth valve flaps, and seventh valve flaps; the multi-way valve 1 includes a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface and corresponding first valve flaps, second valve flaps, third valve flaps, fourth valve flaps, fifth valve flaps, sixth valve flaps, and seventh valve flaps; the electric drive module 4 has an active heating function, or the electric drive module 4 does not have an active heating function, and the battery pack 6 or the cooler 7 is connected in series with a thermistor 9; the electric drive module 4 The inlet end is fixedly connected and communicated with the first interface, the outlet end of the electric drive module 4, the inlet end of the radiator 5 and the third interface are fixedly connected and communicated, and the outlet end of the radiator 5 is fixedly connected and communicated with the second interface; the inlet end of the radiator 5 is used to be fixedly connected and communicated with the exhaust end of the balancing tank 10; the first water pump 2 is fixedly connected and communicated with the inlet end or the outlet end of the electric drive module 4, and the inlet end of the first water pump 2 is used to be fixedly connected and communicated with the replenishing end of the balancing tank 10; the inlet end of the battery pack 6 is fixedly connected and communicated with the fourth interface, and the outlet end of the battery pack 6 is fixedly connected and communicated with the seventh interface; the second water pump 3 is fixedly connected and communicated with the inlet end or the outlet end of the battery pack 6, and the inlet end of the second water pump 3 is used to be fixedly connected and communicated with the replenishing end of the balancing tank 10; the inlet end of the cooler 7 is fixedly connected and communicated with the sixth interface, and the outlet end of the cooler 7 is fixedly connected and communicated with the fifth interface; the execution mode of the multi-way valve 1 includes at least the first mode; the first mode is that the first valve flap is connected with the second valve flap, and the seventh valve flap is connected with the fourth valve flap.

[0046] Specifically, the multi-way valve 1 at least includes a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface and a first valve flap, a second valve flap, a third valve flap, a fourth valve flap, a fifth valve flap, a sixth valve flap, and a seventh valve flap corresponding thereto. In this embodiment, the multi-way valve 1 adopts an eight-way valve, such as Figures 1 to 2 shown.

[0047] like Figures 3 to 5 As shown, the electric drive module 4 has an active heating function, and the electric drive module 4 includes a DC converter 41, a charger 42, an electric control 43 and a motor 44 connected in series; in some embodiments, such as Figure 5 As shown, the motor 44 is an oil-cooled motor 44, the electric drive module 4 also includes an oil cooler 45, the DC converter 41, the charger 42, the electronic control 43 and the oil cooler 45 are connected in series, and the motor 44 is electrically connected to the oil cooler 45; preferably, as Figure 4As shown, the electric drive module 4 adopts an integrated electric drive module 4 with active heating function; or, in other embodiments, such as Figure 6 and Figure 7 As shown, the electric drive module 4 does not have an active heating function, and the battery pack 6 is connected in series with the thermistor 9 or the cooler 7 is connected in series with the thermistor 9 .

[0048] The inlet end of the electric drive module 4 is fixedly connected and communicated with the first interface, and the first water pump 2 is fixedly connected and communicated with the inlet end of the electric drive module 4; specifically, Figures 3 to 8 As shown, a first tee is provided on the first interface, the first liquid replenishing end of the balancing tank 10 is fixedly connected and communicated with the inlet end of the first tee, the first outlet end of the first tee is fixedly connected and communicated with the first interface, the second outlet end of the first tee is fixedly connected and communicated with the inlet end of the first water pump 2, and the outlet end of the first water pump 2 is fixedly connected and communicated with the inlet end of the electric drive module 4.

[0049] The outlet end of the electric drive module 4, the inlet end of the radiator 5 and the third interface are fixedly connected and communicated, the outlet end of the radiator 5 is fixedly connected and communicated with the second interface; the inlet end of the radiator 5 is used to be fixedly connected and communicated with the exhaust end of the balance tank 10; specifically, Figures 3 to 8 As shown, a second tee is provided on the third interface, the outlet end of the electric drive module 4 is fixedly connected and communicated with the inlet end of the second tee, the first outlet end of the second tee is fixedly connected and communicated with the third interface, the second outlet end of the second tee is fixedly connected and communicated with the inlet end of the radiator 5, and the outlet end of the radiator 5 is fixedly connected and communicated with the second interface; the inlet end of the radiator 5 is provided with a third tee, as shown in FIG. Figure 3 As shown, the outlet end of the third tee is fixedly connected to and communicated with the exhaust end of the balance tank 10 .

[0050] The inlet end of the battery pack 6 is fixedly connected and communicated with the fourth interface, the second water pump 3 is fixedly connected and communicated with the inlet end of the battery pack 6, and the outlet end of the battery pack 6 is fixedly connected and communicated with the seventh interface; the inlet end of the cooler 7 is fixedly connected and communicated with the sixth interface, and the outlet end of the cooler 7 is fixedly connected and communicated with the fifth interface; specifically, Figures 3 to 8 As shown, a fourth tee is provided on the fourth interface, the inlet end of the fourth tee is fixedly connected and communicated with the second replenishing end of the balancing tank 10, the first outlet end of the fourth tee is fixedly connected and communicated with the fourth interface, the second outlet end of the fourth tee is fixedly connected and communicated with the inlet end of the second water pump 3, the outlet end of the second water pump 3 is fixedly connected and communicated with the inlet end of the battery pack 6, and the outlet end of the battery pack 6 is fixedly connected and communicated with the seventh interface.

[0051] In some embodiments, Figure 8 As shown, a liquid-cooled condenser 8 is connected between the electric drive module 4 and the third interface.

[0052] The execution mode of the multi-way valve 1 includes at least a first mode, preferably, as Fig. 9 As shown in Tables 1 and 2, Table 1 shows a list of switching modes of a thermal management system without a liquid-cooled condenser, and Table 2 shows a list of switching modes of a thermal management system with a liquid-cooled condenser; the execution modes of the multi-way valve 1 include a first mode, a second mode, a third mode, a fourth mode, a fifth mode, a sixth mode, a seventh mode and an eighth mode.

[0053] Table 1

[0054]

[0055] Table 2

[0056]

[0057] In the first mode, the first valve flap is connected to the second valve flap, and the seventh valve flap is connected to the fourth valve flap, the electric drive module 4 and the radiator 5 are connected in series to form a loop to cool the electric drive module 4, the cooler 7 does not work, and the battery pack 6 is self-circulating.

[0058] In the second mode, the third valve flap is connected to the sixth valve flap, the fifth valve flap is connected to the first valve flap, and the seventh valve flap is connected to the fourth valve flap. The electric drive module 4 and the cooler 7 are connected in series to form a loop so that the heat pump only absorbs heat from the electric drive, the radiator 5 does not work, and the battery pack 6 is self-circulating, which will not affect the temperature of the battery pack 6.

[0059] In the third mode, the second valve flap is connected to the first valve flap, and the seventh valve flap is connected to the sixth valve flap, and the fifth valve flap is connected to the fourth valve flap, the electric drive module 4 and the radiator 5 are connected in series to form a loop, and the battery pack 6 and the cooler 7 are connected in series to form a loop, thereby realizing water cooling of the electric drive module 4 and cooling of the battery pack 6 by the cooler 7.

[0060] In the fourth mode, the second valve flap is connected to the fourth valve flap, and the seventh valve flap is connected to the first valve flap, the electric drive module 4, the radiator 5 and the battery pack 6 are connected in series to form a loop, and the cooler 7 does not work, thereby achieving water cooling of the electric drive module 4 and the battery pack 6.

[0061] In the fifth mode, the second valve flap is connected to the sixth valve flap, and the fifth valve flap is connected to the first valve flap, and the seventh valve flap is connected to the fourth valve flap. The electric drive module 4, the radiator 5, and the cooler 7 are connected in series to form a loop to enable the heat pump to absorb heat from the electric drive module 4 and the environment, and the battery pack 6 is self-circulating.

[0062] In the sixth mode, the third valve flap is connected to the fourth valve flap, and the seventh valve flap is connected to the first valve flap, the electric drive module 4 and the battery pack 6 are connected in series to form a loop, the radiator 5 and the cooler 7 are closed, and when the electric drive module 4 has an active heating function, the electric drive module 4 directly heats the battery pack 6, or the electric drive module 4 does not have an active heating function, and the waste heat of the electric drive module 4 heats the battery pack 6.

[0063] In the seventh mode, the third valve flap is connected to the first valve flap, the seventh valve flap is connected to the sixth valve flap, and the fifth valve flap is connected to the fourth valve flap. The electric drive module 4 is self-circulating, the radiator 5 does not work, and the battery pack 6 and the cooler 7 are connected in series to form a loop, so that the heat pump absorbs heat from the battery pack 6.

[0064] The eighth mode is that the third valve flap is connected to the first valve flap, and the seventh valve flap is connected to the fourth valve flap, the electric drive module 4 is self-circulating, the radiator 5 and the cooler 7 are not working, and the battery pack 6 is self-circulating.

[0065] In some embodiments, the heat pump system of the present application also includes a controller, which is electrically connected to the multi-way valve 1, for controlling the multi-way valve 1 to switch the execution mode, and for being electrically connected to the battery controller, the vehicle controller, the ambient temperature sensor, the water temperature sensor, and the air conditioning controller respectively.

[0066] The present application also provides a control method for a thermal management system based on a multi-way valve, which is applied to any of the thermal management systems based on a multi-way valve described above, wherein the execution modes of the multi-way valve 1 include a first mode, a second mode, a third mode, a fourth mode, a fifth mode, a sixth mode, a seventh mode and an eighth mode; and comprises the following control steps:

[0067] Step 1: When the battery temperature is greater than the forced cooling temperature, the multi-way valve 1 executes the third mode;

[0068] Step 2: When the battery temperature is lower than the natural cooling temperature and higher than the self-circulation temperature, the multi-way valve 1 executes the first mode;

[0069] Step 3: When the battery pack 6 does not need to be cooled or heated and the ambient temperature is greater than the minimum operating temperature of the heat pump, and the water temperature at the outlet of the electric drive module 4 is greater than the ambient temperature, the multi-way valve 1 executes the second mode;

[0070] Step 4: When the battery pack 6 needs to be heated and the electric drive module 4 has an active heating function, the multi-way valve 1 executes the sixth mode; or when the electric drive module 4 does not have an active heating function and the battery pack 6 is connected in series with a thermistor 9, the multi-way valve 1 executes the eighth mode, or when the cooler 7 is connected in series with a thermistor 9, the multi-way valve 1 executes the seventh mode.

[0071] Preferably, as shown in Table 1, the control steps for a thermal management system with a liquid-cooled condenser are as follows:

[0072] Step 1: When the battery temperature is greater than the forced cooling temperature, the multi-way valve 1 executes the third mode; wherein the forced cooling temperature indicates that when the battery temperature is greater than the temperature, the battery pack 6 needs the forced cooler 7 to cool the battery pack 6;

[0073] Step 2: When the battery temperature is lower than the natural cooling temperature and higher than the self-circulation temperature, the multi-way valve 1 executes the first mode; wherein the natural cooling temperature means that when the temperature is between this temperature and the forced cooling temperature, the battery pack 6 needs to be cooled, but does not need to be cooled by the cooler 7, and is only cooled by the radiator 5; the self-circulation temperature means that when the temperature is between this temperature and the natural cooling temperature, the battery pack 6 does not need to be cooled or heated, and the battery only needs to self-circulate to achieve temperature uniformity, and only the electric drive has a cooling demand;

[0074] Step 3: When the battery pack 6 does not need cooling or heating and the ambient temperature is greater than the minimum operating temperature of the heat pump, and the water temperature at the outlet of the electric drive module 4 is greater than the ambient temperature, the multi-way valve 1 executes the second mode; wherein the minimum operating temperature of the heat pump represents the minimum operating temperature point of the heat pump;

[0075] Step 4: When the battery pack 6 needs to be heated and the electric drive module 4 has an active heating function, Figure 3 As shown, the multi-way valve 1 executes the sixth mode; or the electric drive module 4 does not have an active heating function, and the battery pack 6 is connected in series with the thermistor 9, such as Figure 6 As shown, the multi-way valve 1 executes the eighth mode, or the cooler 7 is connected in series with the thermistor 9, as shown in FIG. Figure 7 As shown, the multi-way valve 1 executes the seventh mode; preferably, when the water temperature in the electric drive module 4 is greater than the water temperature in the battery pack 6, the multi-way valve 1 executes the sixth mode; wherein, when the battery temperature is less than the minimum operating temperature of the heat pump, the battery pack 6 needs to be heated;

[0076] Step 8: When the battery temperature is lower than the forced cooling temperature and higher than the natural cooling temperature, the multi-way valve 1 executes the fourth mode;

[0077] Step 9: When the battery pack 6 does not need to be cooled or heated and the ambient temperature is greater than the minimum operating temperature of the heat pump, and the water temperature at the outlet of the electric drive module 4 is lower than the ambient temperature, the multi-way valve 1 executes the fifth mode;

[0078] Step 10: When the battery controller sends a signal that it is in an overcharge state and the air conditioning controller sends a heating demand, the multi-way valve 1 executes the seventh mode; wherein the signal that it is in an overcharge state means that when the battery pack 6 is in an overcharge state, the battery controller monitors the state of the battery pack 6 and sends a cooler cooling demand signal;

[0079] Step 11: When the battery controller sends a heat storage signal, the multi-way valve 1 executes the eighth mode;

[0080] Preferably, as shown in Table 2, the control steps are added to the thermal management system with a liquid-cooled condenser as follows:

[0081] Step 5: When the air conditioning controller sends a defrosting signal for the radiator 5, the multi-way valve 1 executes the first mode;

[0082] Step 6: When the vehicle controller sends a long-stay signal, the multi-way valve 1 executes the sixth mode; wherein the long-stay signal means that the operator has left the vehicle for more than one hour, and a long-stay signal is formed on the vehicle controller by monitoring the length of time when the vehicle is not operated by pressing a button or a timer;

[0083] Step 7: When the air conditioning controller sends a passenger compartment defog signal, the multi-way valve 1 executes the first mode.

[0084] Preferably, for a thermal management system with a liquid-cooled condenser, in step 3 and step 9, the water temperature at the outlet of the electric drive module 4 adopts the water temperature at the outlet of the liquid-cooled condenser 8 located at the outlet of the electric drive module 4, such as Figure 8 shown.

[0085] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the present invention.

Claims

1. A thermal management system based on a multi-way valve, characterized in that: It comprises a multi-way valve (1), a first water pump (2), a second water pump (3), an electric drive module (4), a radiator (5), a battery pack (6) and a cooler (7); The multi-way valve (1) comprises at least a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface and corresponding first valve flaps, a second valve flap, a third valve flap, a fourth valve flap, a fifth valve flap, a sixth valve flap, and a seventh valve flap; The electric drive module (4) has an active heating function, or the electric drive module (4) does not have an active heating function, and the battery pack (6) or the cooler (7) is connected in series with a thermistor (9); the inlet end of the electric drive module (4) is fixedly connected to and communicated with the first interface, the outlet end of the electric drive module (4), the inlet end of the radiator (5) and the third interface are fixedly connected to and communicated with each other, the outlet end of the radiator (5) is fixedly connected to and communicated with the second interface, and the inlet end of the radiator (5) is used to be fixedly connected to and communicated with the exhaust end of the balancing tank (10); the first water pump (2) is fixedly connected to and communicated with the inlet end or the outlet end of the electric drive module (4), and the inlet end of the first water pump (2) is used to be fixedly connected to and communicated with the liquid replenishing end of the balancing tank (10); The inlet end of the battery pack (6) is fixedly connected to and communicated with the fourth interface, and the outlet end of the battery pack (6) is fixedly connected to and communicated with the seventh interface; the second water pump (3) is fixedly connected to and communicated with the inlet end or the outlet end of the battery pack (6), and the inlet end of the second water pump (3) is used to be fixedly connected to and communicated with the liquid replenishing end of the balancing tank (10); the inlet end of the cooler (7) is fixedly connected to and communicated with the sixth interface, and the outlet end of the cooler (7) is fixedly connected to and communicated with the fifth interface; The execution mode of the multi-way valve (1) includes at least a first mode; in the first mode, the first valve flap is connected to the second valve flap, and the seventh valve flap is connected to the fourth valve flap.

2. A thermal management system based on a multi-way valve according to claim 1, characterized in that: A liquid-cooled condenser (8) is connected between the electric drive module (4) and the third interface.

3. A thermal management system based on a multi-way valve according to claim 1 or 2, characterized in that: The execution mode includes a second mode, in which the third valve flap is communicated with the sixth valve flap, the fifth valve flap is communicated with the first valve flap, and the seventh valve flap is communicated with the fourth valve flap.

4. A thermal management system based on a multi-way valve according to claim 1 or 2, characterized in that: The execution mode includes a third mode, in which the second valve flap is communicated with the first valve flap, the seventh valve flap is communicated with the sixth valve flap, and the fifth valve flap is communicated with the fourth valve flap.

5. A thermal management system based on a multi-way valve according to claim 1 or 2, characterized in that: The execution mode includes a fourth mode, in which the second valve flap is communicated with the fourth valve flap, and the seventh valve flap is communicated with the first valve flap.

6. A thermal management system based on a multi-way valve according to claim 1 or 2, characterized in that: The execution mode includes a fifth mode, in which the second valve flap is communicated with the sixth valve flap, the fifth valve flap is communicated with the first valve flap, and the seventh valve flap is communicated with the fourth valve flap.

7. A thermal management system based on a multi-way valve according to claim 1 or 2, characterized in that: The execution mode includes a sixth mode, in which the third valve flap is communicated with the fourth valve flap, and the seventh valve flap is communicated with the first valve flap.

8. A thermal management system based on a multi-way valve according to claim 1 or 2, characterized in that: The execution mode includes a seventh mode, in which the third valve flap is communicated with the first valve flap, the seventh valve flap is communicated with the sixth valve flap, and the fifth valve flap is communicated with the fourth valve flap.

9. A thermal management system based on a multi-way valve according to claim 1 or 2, characterized in that: The execution mode includes an eighth mode, in which the third valve flap is communicated with the first valve flap, and the seventh valve flap is communicated with the fourth valve flap.

10. A thermal management system based on a multi-way valve according to claim 1, characterized in that: It also includes a controller, which is electrically connected to the multi-way valve (1) and is used to control the multi-way valve (1) to switch the execution mode, and is used to be electrically connected to a battery controller, a vehicle controller, an ambient temperature sensor, a plurality of water temperature sensors, and an air conditioning controller.

11. A control method for a thermal management system based on a multi-way valve, applied to a thermal management system based on a multi-way valve according to any one of claims 1 to 10, characterized in that: The execution modes of the multi-way valve (1) include a first mode, a second mode, a third mode, a fourth mode, a fifth mode, a sixth mode, a seventh mode and an eighth mode; and include the following control steps: Step 1: When the battery temperature is greater than the forced cooling temperature, the multi-way valve (1) executes the third mode; Step 2: When the battery temperature is lower than the natural cooling temperature and higher than the self-circulation temperature, the multi-way valve (1) executes the first mode; Step 3: When the battery pack (6) does not need to be cooled or heated and the ambient temperature is greater than the minimum operating temperature of the heat pump, and the water temperature at the outlet of the electric drive module (4) is greater than the ambient temperature, the multi-way valve (1) executes the second mode; Step 4: When the battery pack (6) needs to be heated and the electric drive module (4) has an active heating function, the multi-way valve (1) executes the sixth mode; or when the electric drive module (4) does not have an active heating function and the battery pack (6) is connected in series with a thermistor (9), the multi-way valve (1) executes the eighth mode, or when the cooler (7) is connected in series with a thermistor (9), the multi-way valve (1) executes the seventh mode.

12. The control method of a thermal management system based on a multi-way valve according to claim 11, characterized in that: The thermal management system comprises a liquid-cooled condenser (8); the control step further comprises step 5: when the air-conditioning controller sends a defrosting signal for the radiator (5), the multi-way valve (1) executes the first mode.

13. The control method of a thermal management system based on a multi-way valve according to claim 12, characterized in that: The control steps also include step 6: when the vehicle controller sends a long-term stay signal, the multi-way valve (1) executes the sixth mode.

14. The control method of a thermal management system based on a multi-way valve according to claim 12, characterized in that: The control step also includes step 7: when the air conditioning controller sends a passenger compartment defog signal, the multi-way valve (1) executes the first mode.

15. The control method of a thermal management system based on a multi-way valve according to claim 11, characterized in that: In step 4, the electric drive module (4) does not have an active heating function, the battery pack (6) or the cooler (7) is connected in series with a thermistor (9), and when the water temperature in the electric drive module (4) is greater than the water temperature in the battery pack (6), the multi-way valve (1) executes the sixth mode.

16. A control method for a thermal management system based on a multi-way valve according to claim 11 or 12, characterized in that: The control step further includes step 8: when the battery temperature is lower than the forced cooling temperature and higher than the natural cooling temperature, the multi-way valve (1) executes the fourth mode.

17. A control method for a thermal management system based on a multi-way valve according to claim 11 or 12, characterized in that: The control step also includes step 9: when the battery pack (6) requires neither cooling nor heating and the ambient temperature is greater than the minimum operating temperature of the heat pump, and the water temperature at the outlet of the electric drive module (4) is lower than the ambient temperature, the multi-way valve (1) executes the fifth mode.

18. A control method for a thermal management system based on a multi-way valve according to claim 11 or 12, characterized in that: The control step further comprises step 10: when the battery controller sends a signal indicating that the battery is in an overcharge state and the air conditioning controller sends a heating request, the multi-way valve (1) executes a seventh mode.

19. A control method for a thermal management system based on a multi-way valve according to claim 11 or 12, characterized in that: The control step also includes step 11: when the battery controller sends a heat storage signal, the multi-way valve (1) executes the eighth mode.

Images