Power system and vehicle

Abstract

The utility model relates to a power system and a vehicle. The power system comprises a power battery module, a three-phase inverter, a three-phase motor winding and a heating control switch unit electrically connected with the power battery module, the three-phase inverter and the three-phase motor winding. And the heating control switch unit is used for connecting the first part winding and the second part winding in the three-phase motor winding in series and then electrically connecting the first part winding and the second part winding in a current loop when the power battery module is heated. Compared with a mode that each phase winding of the three-phase motor winding is connected in parallel, the induction value in a current loop is increased to a certain extent, so that the charge and discharge current is increased, and the heating time is shortened and the heating efficiency is improved on the premise of needing the same heating amount; in addition, on the basis that the inductance is increased, no additional inductance element is added, and the hardware cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy, in particular to a power system and a vehicle. BACKGROUND

[0002] At present, the heating of the battery of an electric vehicle mainly includes two modes: one is external heating of the battery, i.e. using a heating object to directly heat the battery to increase the temperature of the battery, such as a hot air machine; the other is internal heating of the battery, i.e. passing a large current through the battery to generate heat by the internal resistance of the battery, thereby heating the battery.

[0003] The internal heating mode of the battery requires a storage element to circulate the energy between the battery and the storage element, and when the charging and discharging current flows through the internal resistance of the battery, the internal resistance generates heat, and the amount of heat generated is equal to the square of the charging and discharging current, the internal resistance of the battery and the heating time.

[0004] At present, the motor winding is used as a storage element. Due to the insufficient inductance of the motor winding, the charging and discharging current is not large enough. When the internal resistance of the battery is constant, a longer heating time is required to generate the same amount of heat, which affects the self-heating efficiency of the battery and thus affects the user experience. CONTENT OF THE INVENTION

[0005] The embodiments of the present application provide a power system and a vehicle, which can increase the inductance in the current loop during heating without additionally increasing the inductance element, thereby increasing the charging and discharging current and improving the heating efficiency, to at least partially solve the above technical problems.

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a power system is provided, comprising:

[0007] a power battery module, a three-phase inverter and a three-phase motor winding, and a heating control switch unit electrically connected with the power battery module, the three-phase inverter and the three-phase motor winding;

[0008] The heating control switch unit is used to electrically connect a first part of the winding and a second part of the winding in series in the current loop when heating the power battery module.

[0009] Optionally, the heating control switch unit comprises a heating control switch.

[0010] The first end of the heating control switch is electrically connected with the power battery module, and the second end of the heating control switch is electrically connected with the three-phase inverter and the three-phase motor winding, respectively.

[0011] Optionally, the first end of the heating control switch is electrically connected with the negative electrode of the power battery module, and the second end of the heating control switch is electrically connected with the input end of any phase winding of the three-phase motor winding.

[0012] Optionally, the first end of the heating control switch is electrically connected with the negative electrode of the power battery module, and the second end of the heating control switch is electrically connected with the input end of any two-phase winding in the three-phase motor winding.

[0013] Optionally, the first end of the heating control switch is electrically connected with the positive electrode of the power battery module, and the second end of the heating control switch is electrically connected with the input end of any one-phase winding in the three-phase motor winding.

[0014] Optionally, the first end of the heating control switch is electrically connected with the positive electrode of the power battery module, and the second end of the heating control switch is electrically connected with the input end of any two-phase winding in the three-phase motor winding.

[0015] Optionally, the heating control switch unit comprises a first heating control switch and a second heating control switch.

[0016] The first end of the first heating control switch is electrically connected with the negative electrode of the power battery module, and the second end of the first heating control switch is electrically connected with the three-phase inverter and the three-phase motor winding.

[0017] The first end of the second heating control switch is electrically connected with the positive electrode of the power battery module, and the second end of the second heating control switch is electrically connected with the three-phase inverter and the three-phase motor winding.

[0018] Optionally, the heating control switch unit comprises a first heating control switch, a second heating control switch and a third heating control switch.

[0019] The first end of the first heating control switch is electrically connected with the power battery module, and the second end of the first heating control switch is electrically connected with the input end of the first-phase winding in the three-phase motor winding.

[0020] The first end of the second heating control switch is electrically connected with the power battery module, and the second end of the second heating control switch is electrically connected with the input end of the second-phase winding in the three-phase motor winding.

[0021] The first end of the third heating control switch is electrically connected with the power battery module, and the second end of the third heating control switch is electrically connected with the input end of the third-phase winding in the three-phase motor winding.

[0022] Optionally, the heating control switch unit comprises a first heating control switch, a second heating control switch, a third heating control switch, a fourth heating control switch, a fifth heating control switch and a sixth heating control switch.

[0023] The first end of the first heating control switch is electrically connected with the negative electrode of the power battery module, and the second end of the first heating control switch is electrically connected with the input end of the first-phase winding in the three-phase motor winding.

[0024] The first end of the second heating control switch is electrically connected with the negative electrode of the power battery module, and the second end of the second heating control switch is electrically connected with the input end of the second-phase winding in the three-phase motor winding;

[0025] The first end of the third heating control switch is electrically connected with the negative electrode of the power battery module, and the second end of the third heating control switch is electrically connected with the input end of the third-phase winding in the three-phase motor winding;

[0026] The first end of the fourth heating control switch is electrically connected with the positive electrode of the power battery module, and the second end of the fourth heating control switch is electrically connected with the input end of the first-phase winding in the three-phase motor winding;

[0027] The first end of the fifth heating control switch is electrically connected with the positive electrode of the power battery module, and the second end of the fifth heating control switch is electrically connected with the input end of the second-phase winding in the three-phase motor winding;

[0028] The first end of the sixth heating control switch is electrically connected with the positive electrode of the power battery module, and the second end of the sixth heating control switch is electrically connected with the input end of the third-phase winding in the three-phase motor winding.

[0029] According to the second aspect of the present application, a vehicle is provided, which comprises the power system in any of the above embodiments.

[0030] The power system in the embodiments of the present application is additionally provided with the heating control switch unit electrically connected with the power battery module, the three-phase inverter and the three-phase motor winding respectively. The heating control switch unit can be used to electrically connect the first part of the winding and the second part of the winding in series in the current loop when the power battery module is heated. Compared with the parallel connection of each phase winding of the three-phase motor winding, the inductance in the current loop is increased to some extent, so that the charging and discharging current is increased. Under the premise of requiring the same amount of heating, the heating time is shortened, and the heating efficiency is improved. In addition, the inductance element is not additionally increased on the basis of increasing the inductance, and the hardware cost is reduced.

[0031] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0033] For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in connection with the accompanying drawings in which like numbers represent like parts.

[0034] Figure 1 is a structure diagram of a power system in which a heating control switch is electrically connected to a negative electrode of a power battery module in an exemplary embodiment disclosed in the present application;

[0035] Figure 2 is a current diagram of the power system in which the heating control switch is electrically connected to the negative electrode of the power battery module in the heating first stage in the exemplary embodiment disclosed in the present application;

[0036] Figure 3 is a current diagram of the power system in which the heating control switch is electrically connected to the negative electrode of the power battery module in the heating second stage in the exemplary embodiment disclosed in the present application;

[0037] Figure 4 is a current diagram of the power system in which the heating control switch is electrically connected to the negative electrode of the power battery module in the heating third stage in the exemplary embodiment disclosed in the present application;

[0038] Figure 5 is a current diagram of the power system in which the heating control switch is electrically connected to the negative electrode of the power battery module in the heating fourth stage in the exemplary embodiment disclosed in the present application;

[0039] Figure 6 is a structure diagram of a power system in which a heating control switch is electrically connected to a positive electrode of a power battery module in an exemplary embodiment disclosed in the present application;

[0040] Figure 7 is a current diagram of the power system in which the heating control switch is electrically connected to the positive electrode of the power battery module in the heating first stage in the exemplary embodiment disclosed in the present application;

[0041] Figure 8 is a current diagram of the power system in which the heating control switch is electrically connected to the positive electrode of the power battery module in the heating second stage in the exemplary embodiment disclosed in the present application;

[0042] Figure 9 is a current diagram of the power system in which the heating control switch is electrically connected to the positive electrode of the power battery module in the heating third stage in the exemplary embodiment disclosed in the present application;

[0043] Figure 10 is a current diagram of the power system in which the heating control switch is electrically connected to the positive electrode of the power battery module in the heating fourth stage in the exemplary embodiment disclosed in the present application. DETAILED DESCRIPTION

[0044] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0045] According to a first aspect of the present application, as shown in the accompanying drawings, Figure 1 A power system is provided, comprising a power battery module U, a three-phase inverter Q and a three-phase motor winding L, and a heating control switch unit electrically connected with the power battery module U, the three-phase inverter Q and the three-phase motor winding L.

[0046] The power battery module U comprises a power battery pack U1 and a power battery pack U2 connected in series.

[0047] The three-phase inverter Q comprises a switch tube Q1, a switch tube Q2, a switch tube Q3, a switch tube Q4, a switch tube Q5 and a switch tube Q6.

[0048] The three-phase motor winding comprises a first-phase winding L1, a second-phase winding L2 and a third-phase winding L3.

[0049] In the embodiment, the heating control switch unit comprises a heating control switch K1, a first end of the heating control switch K1 is electrically connected with a negative electrode of the power battery module U, and a second end of the heating control switch K1 is electrically connected with an input end of the third-phase winding L3 in the three-phase motor winding L, an emitter of the switch tube Q3 in the three-phase inverter Q and a collector of the switch tube Q6 in the three-phase inverter Q, respectively.

[0050] The power system usually further comprises a main positive relay K2, a pre-charge relay K3, a pre-charge resistor R1, a main negative relay K4 and a bus capacitor C1. The pre-charge relay K3 and the pre-charge resistor R1 are used to realize soft start in the power-on stage, so as to slowly raise the voltage on the bus capacitor C1, avoiding damage to the related devices in the later stage caused by too fast voltage rise. The main positive relay K2 and the main negative relay K4 are used to realize normal on-off of power supply.

[0051] The heating control switch unit is used to electrically connect a first part of windings and a second part of windings in the three-phase motor winding L in series in a current loop when heating the power battery module U.

[0052] The three-phase motor winding L comprises a first-phase winding L1, a second-phase winding L2 and a third-phase winding L3, so the first part of windings and the second part of windings mentioned here can have various combinations.

[0053] In the embodiment, the heating control switch K1 is used to electrically connect the third-phase winding L3 in the three-phase motor winding L, the switch tube Q3 in the three-phase inverter Q and the switch tube Q6 in the three-phase inverter Q in series in the current loop when heating the power battery module U. Figure 1The heating control switch K1 in the first phase is taken as an example, which is electrically connected with the third phase winding L3, so that when the power battery module U is heated subsequently, the first phase winding L1 and the second phase winding L2 are connected in parallel and then connected in series with the third phase winding L3, and then connected in the current loop. It should be noted that the on-off of the loop in which the first phase winding L1 is located during heating is controlled by the switch tube Q1 and the switch tube Q2, and the on-off of the loop in which the second phase winding L2 is located during heating is controlled by the switch tube Q4 and the switch tube Q5. Based on the control of the switch tube Q1, the switch tube Q2, the switch tube Q4 and the switch tube Q5 during heating, the first part winding includes the first phase winding L1 and / or the second phase winding L2, and the second part winding includes the third phase winding L3 at this time.

[0054] The specific heating process is as follows:

[0055] The first phase, as shown in Figure 2 , at least one of the switch tubes Q1 and Q2 is turned on (for example, all of the switch tubes Q1 and Q2 are turned on), and all other switch tubes are turned off. The current flows out from the positive electrode of the power battery module U, passes through the main positive relay K2, the switch tube Q1 and the first phase winding L1, the switch tube Q2 and the second phase winding L2, the third phase winding L3, and the heating control switch K1, and returns to the negative electrode of the power battery module U. During this process, the power battery module U discharges, and the three-phase motor winding L stores energy.

[0056] The second phase, as shown in Figure 3 , all switch tubes turned on in the first phase (for example, the switch tubes Q1 and Q2) are turned off. The current flows out from the positive electrode of the power battery module U, passes through the main positive relay K2, the bus capacitor C1, the freewheeling diode in the switch tube Q4 and the first phase winding L1, the freewheeling diode in the switch tube Q5 and the second phase winding L2, the third phase winding L3, and the heating control switch K1, and returns to the negative electrode of the power battery module U. During this process, the power battery module U discharges, the three-phase motor winding L releases energy, and the bus capacitor C1 charges.

[0057] The third phase, as shown in Figure 4 , at least one of the switch tubes Q4 and Q5 is turned on (for example, all of the switch tubes Q4 and Q5 are turned on), and all other switch tubes are turned off. The current flows out from the bus capacitor C1, passes through the main positive relay K2, the positive electrode of the power battery module U, the negative electrode of the power battery module U, the heating control switch K1, the third phase winding L3, the first phase winding L1 and the switch tube Q4, the second phase winding L2 and the switch tube Q5, and returns to the bus capacitor C1. During this process, the bus capacitor C1 discharges, the three-phase motor winding L stores energy, and the power battery module U charges.

[0058] The fourth phase, as shown in Figure 5As shown, all the switches (for example, switch Q4 and switch Q5) controlled to be turned on in the third stage are turned off, and the current flows out from the first phase winding L1 and the second phase winding L2, passes through the freewheeling diode in switch Q1 and the freewheeling diode in switch Q2, the main positive relay K2, the positive pole of the power battery module U, the negative pole of the power battery module U, the heating control switch K1, and returns to the third phase winding L3. In this process, the three-phase motor winding L releases energy, and the power battery module U is charged.

[0059] Based on the above heating process, when the first phase winding L1 and the second phase winding L2 participate in heating at the same time, the first partial winding includes the first phase winding L1 and the second phase winding L2, and if the inductance of the first phase winding L1, the second phase winding L2 and the third phase winding L3 is 1 respectively, the inductance in the current loop is 1 / 2+1=3 / 2. If the first phase winding L1, the second phase winding L2 and the third phase winding L3 are all in parallel, the inductance in the current loop is only 1 / 3. Compared with the prior art, the embodiment can increase the inductance in the current loop by 3 / 2 times without adding additional inductive elements.

[0060] In the above embodiment, the first end of the heating control switch K1 is electrically connected to the negative pole of the power battery module U, and the second end of the heating control switch K2 can be electrically connected to the third phase winding L3, the first phase winding L1 or the second phase winding L2. In this case, the first partial winding includes the second phase winding L2 and / or the third phase winding L3, and the second partial winding includes the first phase winding L1; or the first partial winding includes the first phase winding L1 and / or the third phase winding L3, and the second partial winding includes the second phase winding L2.

[0061] In the above embodiment, the first end of the heating control switch K1 is electrically connected to the negative pole of the power battery module U, and the second end of the heating control switch K2 can be electrically connected to the third phase winding L3, the first phase winding L1 or the second phase winding L2. In this case, the first partial winding includes the second phase winding L2 and / or the third phase winding L3, and the second partial winding includes the first phase winding L1; or the first partial winding includes the first phase winding L1 and / or the third phase winding L3, and the second partial winding includes the second phase winding L2.

[0062] Optionally, as shown in FIG. 6, the heating control switch K1 is electrically connected to the negative pole of the power battery module U, and the heating control switch K2 is electrically connected to the first phase winding L1 and the second phase winding L2. In this case, the first partial winding includes the third phase winding L3, and the second partial winding includes the first phase winding L1 and the second phase winding L2. Figure 6As shown, the first end of the heating control switch K1 is electrically connected to the positive electrode of the power battery module U, and the second end of the heating control switch K1 is electrically connected to the input end of the third phase winding L3 in the three-phase motor winding L, the emitter of the switch tube Q3 in the three-phase inverter Q, and the collector of the switch tube Q6 in the three-phase inverter Q.

[0063] The specific heating process is as follows:

[0064] The first stage, such as Figure 7 As shown, at least one of the switch tubes Q4 and Q5 is controlled to be turned on (for example, both switch tubes Q4 and Q5 are turned on), and all other switch tubes are turned off. Current flows out of the positive electrode of the power battery module U, passes through the heating control switch K1, the third-phase winding L3, the first-phase winding L1 and the switch tube Q4, the second-phase winding L2 and the switch tube Q5, and the main negative relay K4, and returns to the negative electrode of the power battery module U. During this process, the power battery module U discharges, and the three-phase motor winding L stores energy.

[0065] The second stage, such as Figure 8 As shown, all the switches that were turned on in the first stage (such as switches Q4 and Q5) are turned off, and current flows out of the positive electrode of the power battery module U, passes through the heating control switch K1, the third-phase winding L3, the first-phase winding L1 and the freewheeling diode in the switch Q1, the second-phase winding L2 and the freewheeling diode in the switch Q2, the bus capacitor C1, and the main negative relay K4, and returns to the negative electrode of the power battery module U. During this process, the power battery module U discharges, the three-phase motor winding L releases energy, and the bus capacitor C1 charges.

[0066] The third stage, such as Figure 9 As shown, at least one of the switch tubes Q1 and Q2 is controlled to be turned on (for example, both switch tubes Q1 and Q2 are turned on), and all other switch tubes are turned off. Current flows out of the bus capacitor C1, passes through the switch tube Q1 and the first phase winding L1, the switch tube Q2 and the second phase winding L2, the third phase winding L3, the heating control switch K1, the positive electrode of the power battery module U, the negative electrode of the power battery module U, and the main negative relay K4, and returns to the bus capacitor C1. During this process, the bus capacitor C1 discharges, the three-phase motor winding L stores energy, and the power battery module U charges.

[0067] The fourth stage, such as Figure 10As shown, all the switches (for example, switch Q1 and switch Q2) controlled in the third stage are turned off, and the current flows out of the third phase winding L3, through the heating control switch K1, the positive pole of the power battery module U, the negative pole of the power battery module U, the main negative relay K4, the freewheeling diode of switch Q4 and the first phase winding L1, the freewheeling diode of switch Q5 and the second phase winding L2. In this process, the three-phase motor winding L releases energy, and the power battery module U is charged.

[0068] As shown, the first end of the heating control switch K1 is electrically connected to the positive pole of the power battery module U, and the second end of the heating control switch K2 can be electrically connected to the first phase winding L1 (in this case, the first part winding includes the second phase winding L2 and / or the third phase winding L3, and the second part winding includes the first phase winding L1), the second phase winding L2 (in this case, the first part winding includes the first phase winding L1 and / or the third phase winding L3, and the second part winding includes the second phase winding L2), or the third phase winding L3.

[0069] As shown, the first end of the heating control switch K1 is electrically connected to the positive pole of the power battery module U, and the second end of the heating control switch K2 can be electrically connected to the first phase winding L1 and the second phase winding L2 (in this case, the first part winding includes the third phase winding L3, and the second part winding includes the first phase winding L1 and the second phase winding L2), the second phase winding L2 and the third phase winding L3 (in this case, the first part winding includes the first phase winding L1, and the second part winding includes the second phase winding L2 and the third phase winding L3), or the first phase winding L1 and the third phase winding L3 (in this case, the first part winding includes the second phase winding L2, and the second part winding includes the first phase winding L1 and the third phase winding L3).

[0070] In summary, when there is only one heating control switch, the first end of the heating control switch can be electrically connected to the negative pole of the power battery module or the positive pole of the power battery module, and the second end of the heating control switch can be electrically connected to any one of the three-phase motor windings or any two of the three-phase motor windings.

[0071] It should be noted that the heating control switch unit in the above embodiments only includes one heating control switch, which makes the power system only be able to realize heating in a fixed way after being put into use. For example, Figure 1 As shown, when there is only the heating control switch K1 electrically connected to the negative pole of the power battery module U, switch Q3, switch Q6 and the third phase winding L3, the power system can only realize the heating process as shown in Figures 2 to 5 As shown, when there is only the heating control switch K1 electrically connected to the negative pole of the power battery module U, switch Q3, switch Q6 and the third phase winding L3, the power system can only realize the heating process as shown in Figure 6As shown, when only the heating control switch K1 electrically connected with the positive pole of the power battery module U, the switch tube Q3, the switch tube Q6 and the third phase winding L3 is provided, the power system can only realize Figures 7 to 10 As shown, the heating process. When the involved part device fails, the heating process cannot be continued; in addition, the fixed use of certain devices will affect the service life of these devices, and thus affect the overall service life of the power system.

[0072] Optionally, the heating control switch unit includes a first heating control switch and a second heating control switch.

[0073] The first end of the first heating control switch is electrically connected with the negative pole of the power battery module, and the second end of the first heating control switch is electrically connected with the three-phase inverter and the three-phase motor winding.

[0074] The first end of the second heating control switch is electrically connected with the positive pole of the power battery module, and the second end of the second heating control switch is electrically connected with the three-phase inverter and the three-phase motor winding.

[0075] In the above embodiment, it has been mentioned that when only one heating control switch is provided, the reliability of the heating function and the overall service life of the power system are easily affected, and therefore in the present embodiment, the first heating control switch and the second heating control switch are provided respectively, so that after the power system is put into use, the heating scheme corresponding to the negative pole of the power battery module and the heating scheme corresponding to the positive pole of the power battery module can be used alternately, and when the heating scheme corresponding to the negative pole of the power battery module cannot be realized, the heating scheme corresponding to the positive pole of the power battery module can still be used. Since a certain scheme is not fixedly used, the overall service life of the power system can also be improved.

[0076] Optionally, the heating control switch unit includes a first heating control switch, a second heating control switch and a third heating control switch.

[0077] The first end of the first heating control switch is electrically connected with the power battery module, and the second end of the first heating control switch is electrically connected with the input end of the first phase winding in the three-phase motor winding.

[0078] The first end of the second heating control switch is electrically connected with the power battery module, and the second end of the second heating control switch is electrically connected with the input end of the second phase winding in the three-phase motor winding.

[0079] The first end of the third heating control switch is electrically connected with the power battery module, and the second end of the third heating control switch is electrically connected with the input end of the third phase winding in the three-phase motor winding.

[0080] In the above embodiments, it has been mentioned that multiple heating control switches can be used to respectively implement the heating scheme corresponding to the negative electrode of the power battery module and the heating scheme corresponding to the positive electrode of the power battery module. In this embodiment, a first heating control switch, a second heating control switch and a third heating control switch are respectively arranged, so that after the power system is put into use, the heating scheme corresponding to any one of the three-phase motor windings and the heating scheme corresponding to any two of the three-phase motor windings can be alternately used.

[0081] Optionally, the heating control switch unit comprises a first heating control switch, a second heating control switch, a third heating control switch, a fourth heating control switch, a fifth heating control switch and a sixth heating control switch.

[0082] The first end of the first heating control switch is electrically connected to the negative electrode of the power battery module, and the second end of the first heating control switch is electrically connected to the input end of the first-phase winding of the three-phase motor winding.

[0083] The first end of the second heating control switch is electrically connected to the negative electrode of the power battery module, and the second end of the second heating control switch is electrically connected to the input end of the second-phase winding of the three-phase motor winding.

[0084] The first end of the third heating control switch is electrically connected to the negative electrode of the power battery module, and the second end of the third heating control switch is electrically connected to the input end of the third-phase winding of the three-phase motor winding.

[0085] The first end of the fourth heating control switch is electrically connected to the positive electrode of the power battery module, and the second end of the fourth heating control switch is electrically connected to the input end of the first-phase winding of the three-phase motor winding.

[0086] The first end of the fifth heating control switch is electrically connected to the positive electrode of the power battery module, and the second end of the fifth heating control switch is electrically connected to the input end of the second-phase winding of the three-phase motor winding.

[0087] The first end of the sixth heating control switch is electrically connected to the positive electrode of the power battery module, and the second end of the sixth heating control switch is electrically connected to the input end of the third-phase winding of the three-phase motor winding.

[0088] In the above embodiments, it has been mentioned that the plurality of heating control switches can be used to respectively implement the heating scheme corresponding to the negative electrode of the power battery module and the heating scheme corresponding to the positive electrode of the power battery module, and respectively implement the heating scheme corresponding to any one phase winding of the three-phase motor winding and the heating scheme corresponding to any two phase windings of the three-phase motor winding. In this embodiment, the first heating control switch, the second heating control switch, the third heating control switch, the fourth heating control switch, the fifth heating control switch and the sixth heating control switch are respectively arranged, so that all the heating schemes in the above two embodiments can be simultaneously implemented.

[0089] In summary, the heating control switch unit can include one heating control switch or a plurality of heating control switches.

[0090] The power system of the embodiment of the present application is additionally provided with the heating control switch unit electrically connected with the power battery module, the three-phase inverter and the three-phase motor winding, respectively. The heating control switch unit can be used to electrically connect the first part of the windings and the second part of the windings in series in the current loop when the power battery module is heated. Compared with the parallel connection of each phase winding of the three-phase motor winding, the inductance in the current loop is increased to some extent, so that the charging and discharging current is increased. Under the premise of requiring the same amount of heat, the heating time is shortened and the heating efficiency is improved. In addition, the inductance element is not additionally increased on the basis of increasing the inductance, thereby reducing the hardware cost.

[0091] According to the second aspect of the present application, a vehicle is provided, which includes the power system in any of the above embodiments.

[0092] The vehicle of the embodiment of the present application is additionally provided with the heating control switch unit electrically connected with the power battery module, the three-phase inverter and the three-phase motor winding, respectively. The heating control switch unit can be used to electrically connect the first part of the windings and the second part of the windings in series in the current loop when the power battery module is heated. Compared with the parallel connection of each phase winding of the three-phase motor winding, the inductance in the current loop is increased to some extent, so that the charging and discharging current is increased. Under the premise of requiring the same amount of heat, the heating time is shortened and the heating efficiency is improved. In addition, the inductance element is not additionally increased on the basis of increasing the inductance, thereby reducing the hardware cost.

[0093] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0094] In the above embodiments, the description of each embodiment is focused on, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0095] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0096] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. In the embodiments of the present application, the description of each embodiment is focused on, and the part not described in detail in a certain embodiment can be referred to the relevant content of other embodiments. Any brief modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments still belongs to the scope of the technical scheme of the present application.

Claims

1. A power system, characterized in that: include: A power battery module, a three-phase inverter and a three-phase motor winding, and a heating control switch unit electrically connected to the power battery module, the three-phase inverter and the three-phase motor winding; The heating control switch unit is used to connect the first part of the winding and the second part of the winding of the three-phase motor in series and then electrically connect them in a current loop when heating the power battery module.

2. The power system according to claim 1, characterized in that: The heating control switch unit includes a heating control switch; The first end of the heating control switch is electrically connected to the power battery module, and the second end of the heating control switch is electrically connected to the three-phase inverter and the three-phase motor winding respectively.

3. The power system according to claim 2, characterized in that: The first end of the heating control switch is electrically connected to the negative electrode of the power battery module, and the second end of the heating control switch is electrically connected to the input end of any one phase winding of the three-phase motor winding.

4. The power system according to claim 2, characterized in that: The first end of the heating control switch is electrically connected to the negative electrode of the power battery module, and the second end of the heating control switch is electrically connected to the input ends of any two phase windings of the three-phase motor windings.

5. The power system according to claim 2, characterized in that: The first end of the heating control switch is electrically connected to the positive electrode of the power battery module, and the second end of the heating control switch is electrically connected to the input end of any one phase winding of the three-phase motor winding.

6. The power system according to claim 2, characterized in that: The first end of the heating control switch is electrically connected to the positive electrode of the power battery module, and the second end of the heating control switch is electrically connected to the input ends of any two phase windings of the three-phase motor windings.

7. The power system according to claim 1, characterized in that: The heating control switch unit includes a first heating control switch and a second heating control switch; The first end of the first heating control switch is electrically connected to the negative electrode of the power battery module, and the second end of the first heating control switch is electrically connected to the three-phase inverter and the three-phase motor winding respectively; The first end of the second heating control switch is electrically connected to the positive electrode of the power battery module, and the second end of the second heating control switch is electrically connected to the three-phase inverter and the three-phase motor winding respectively.

8. The power system according to claim 1, characterized in that: The heating control switch unit includes a first heating control switch, a second heating control switch and a third heating control switch; A first end of the first heating control switch is electrically connected to the power battery module, and a second end of the first heating control switch is electrically connected to an input end of a first phase winding of the three-phase motor winding; A first end of the second heating control switch is electrically connected to the power battery module, and a second end of the second heating control switch is electrically connected to an input end of a second phase winding of the three-phase motor winding; A first end of the third heating control switch is electrically connected to the power battery module, and a second end of the third heating control switch is electrically connected to an input end of a third phase winding in the three-phase motor winding.

9. The power system according to claim 1, characterized in that: The heating control switch unit includes a first heating control switch, a second heating control switch, a third heating control switch, a fourth heating control switch, a fifth heating control switch and a sixth heating control switch; A first end of the first heating control switch is electrically connected to the negative electrode of the power battery module, and a second end of the first heating control switch is electrically connected to the input end of the first phase winding of the three-phase motor winding; A first end of the second heating control switch is electrically connected to the negative electrode of the power battery module, and a second end of the second heating control switch is electrically connected to the input end of the second phase winding of the three-phase motor winding; A first end of a third heating control switch is electrically connected to the negative electrode of the power battery module, and a second end of the third heating control switch is electrically connected to the input end of the third phase winding of the three-phase motor winding; A first end of the fourth heating control switch is electrically connected to the positive electrode of the power battery module, and a second end of the fourth heating control switch is electrically connected to the input end of the first phase winding of the three-phase motor winding; A first end of the fifth heating control switch is electrically connected to the positive electrode of the power battery module, and a second end of the fifth heating control switch is electrically connected to the input end of the second phase winding of the three-phase motor winding; A first end of the sixth heating control switch is electrically connected to the positive electrode of the power battery module, and a second end of the sixth heating control switch is electrically connected to the input end of the third phase winding of the three-phase motor winding.

10. A vehicle, characterized in that: A power system comprising any one of claims 1 to 9.

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