Power system, power system control method and vehicle

Abstract

The present application relates to a power system, a control method of the power system and a vehicle. The power system includes a battery pack, a switch assembly and an electric drive system. The battery pack includes a first sub-battery pack and a second sub-battery pack. The first sub-battery pack and the second sub-battery pack are electrically connected to the electric drive system through the switch assembly, so that at least one of the first sub-battery pack and the second sub-battery pack is controlled by the switch assembly to supply power to the electric drive system. The battery pack can be divided into a first sub-battery pack and a second sub-battery pack, and each sub-battery pack can be controlled separately, so that when a sub-battery pack is damaged, it can still work based on another sub-battery pack, which can avoid the entire power system from not functioning properly when some units in the battery pack are damaged, thereby improving reliability.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a power system, a control method for the power system, and a vehicle. Background Art

[0002] Electric vehicles are usually equipped with battery packs that provide power and corresponding electric drive systems. The electric drive system converts the electrical energy stored in the battery pack into mechanical energy to drive the electric vehicle. The electric vehicle system includes an electric motor, a motor controller, and a transmission. The electric motor is a key component that converts electrical energy into mechanical energy, and it controls the current and speed through an electronic controller.

[0003] However, the traditional solution has a relatively simple control strategy for the battery pack, so when some units in the battery pack are damaged, the entire power system will not work properly and the reliability is low. Summary of the invention

[0004] The embodiments of the present application provide a power system, a control method for the power system, and a vehicle, which can prevent the entire power system from malfunctioning when some units in the battery pack are damaged, improve reliability, and at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, there is provided a power system, including a battery pack, a switch assembly and an electric drive system, wherein the battery pack includes a first sub-battery pack and a second sub-battery pack;

[0006] The first sub-battery pack and the second sub-battery pack are electrically connected to the electric drive system through the switch assembly, so that at least one of the first sub-battery pack and the second sub-battery pack is controlled by the switch assembly to supply power to the electric drive system.

[0007] Optionally, the switch assembly includes a first switch, a second switch, a third switch and a fourth switch; the positive electrode of the first sub-battery pack is electrically connected to the positive electrode input terminal of the electric drive system through the first switch, the negative electrode of the first sub-battery pack and the positive electrode of the second sub-battery pack are electrically connected to the first common terminal, the first common terminal is electrically connected to the positive electrode input terminal of the electric drive system through the second switch, the first common terminal is also electrically connected to the negative electrode input terminal of the electric drive system through the third switch, and the negative electrode of the second sub-battery pack is electrically connected to the negative electrode input terminal of the electric drive system through the fourth switch.

[0008] Optionally, the electric drive system includes a first electric drive module and a second electric drive module;

[0009] The positive input terminal of the first electric drive module and the positive input terminal of the second electric drive module are electrically connected to the second common terminal, and the second common terminal serves as the positive input terminal of the electric drive system;

[0010] The negative input terminal of the first electric drive module and the negative input terminal of the second electric drive module are electrically connected to the third common terminal, and the third common terminal serves as the negative input terminal of the electric drive system.

[0011] Optionally, the power system further includes a DC charging and discharging module, and the switch assembly further includes a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch;

[0012] The positive electrode of the first sub-battery pack is also electrically connected to the neutral end of the motor of the first electric drive module through the fifth switch, the first common end is also electrically connected to the neutral end of the motor of the first electric drive module through the sixth switch, the first common end is also electrically connected to the neutral end of the motor of the second electric drive module through the seventh switch, and the positive electrode of the first sub-battery pack is also electrically connected to the neutral end of the motor of the second electric drive module through the eighth switch;

[0013] The negative pole of the DC charge and discharge module is electrically connected to the negative input terminal of the electric drive system through the ninth switch, the positive pole of the DC charge and discharge module is electrically connected to the positive input terminal of the electric drive system through the tenth switch, is electrically connected to the neutral terminal of the motor of the first electric drive module through the eleventh switch, and is electrically connected to the neutral terminal of the motor of the second electric drive module through the twelfth switch.

[0014] Optionally, the first electric drive module includes a first bus capacitor, a first power module and a first motor, and the second electric drive module includes a second bus capacitor, a second power module and a second motor;

[0015] The first end of the first bus capacitor and the positive input end of the first power module are electrically connected to the fourth common end, and the fourth common end serves as the positive input end of the first electric drive module. The second end of the first bus capacitor and the negative input end of the first power module are electrically connected to the fifth common end, and the fifth common end serves as the negative input end of the first electric drive module. The output end of the first power module is electrically connected to the first motor.

[0016] The first end of the second bus capacitor and the positive input end of the second power module are electrically connected to the sixth common terminal, and the sixth common terminal serves as the positive input end of the second electric drive module. The second end of the second bus capacitor and the negative input end of the second power module are electrically connected to the seventh common terminal, and the seventh common terminal serves as the negative input end of the second electric drive module. The output end of the second power module is electrically connected to the second motor.

[0017] Optionally, the first electric drive module further includes a first inductor, and the second electric drive module further includes a second inductor;

[0018] The first end of the first inductor serves as the positive input end of the first electric drive module, and the second end of the first inductor is electrically connected to the first end of the first bus capacitor and the positive input end of the first power module respectively;

[0019] The first end of the second inductor serves as the positive input end of the second electric drive module, and the second end of the second inductor is electrically connected to the first end of the second bus capacitor and the positive input end of the second power module respectively.

[0020] Optionally, the electric drive system includes a power module, a motor and a fuse unit;

[0021] The positive input terminal of the power module serves as the positive input terminal of the electric drive system, the negative input terminal of the power module serves as the negative input terminal of the electric drive system, and the output terminal of the power module is electrically connected to the motor;

[0022] The fuse unit is connected in series with the power module and the motor, and is used to disconnect when the current flowing through exceeds a threshold within a preset time.

[0023] Optionally, the insurance unit includes a first insurance device and a second insurance device;

[0024] The first end of the first fuse device serves as the positive input end of the electric drive system, the second end of the first fuse device is electrically connected to the positive input end of the power module, the output end of the power module is electrically connected to the first end of the second fuse device, and the second end of the second fuse device is electrically connected to the motor.

[0025] Optionally, the electric drive system includes a power module, a motor and a common-mode magnetic ring;

[0026] The positive input terminal of the power module serves as the positive input terminal of the electric drive system, the negative input terminal of the power module serves as the negative input terminal of the electric drive system, and the output terminal of the power module is electrically connected to the motor;

[0027] The common mode magnetic ring is arranged between the output end of the power module and the motor.

[0028] According to a second aspect of the present application, a control method for a power system is provided, and the control method for a power system is applied to the power system in any of the above embodiments; the control method for the power system includes:

[0029] Detecting the health status of the first sub-battery pack and the second sub-battery pack;

[0030] The connection and disconnection of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system are controlled according to the health status, so as to supply power to the electric drive system through at least one of the first sub-battery pack and the second sub-battery pack.

[0031] Optionally, controlling the connection and disconnection of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system respectively according to the health status includes:

[0032] When the first sub-battery pack and the second sub-battery pack are both intact:

[0033] Controlling the first switch to be turned on and the fourth switch to be turned on, and providing power to the electric drive system through the first sub-battery pack and the second sub-battery pack;

[0034] Alternatively, the first switch and the third switch are controlled to be turned on, and power is provided to the electric drive system through the first sub-battery pack;

[0035] Alternatively, the second switch and the fourth switch are controlled to be turned on, and power is provided to the electric drive system through the second sub-battery pack.

[0036] Optionally, controlling the connection and disconnection of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system respectively according to the health status includes:

[0037] When the second sub-battery pack is damaged but the first sub-battery pack is not damaged, controlling the first switch to be turned on and the third switch to be turned on, and providing power to the electric drive system through the first sub-battery pack;

[0038] When the first sub-battery pack is damaged but the second sub-battery pack is not damaged, the second switch and the fourth switch are controlled to be turned on, and power is provided to the electric drive system through the second sub-battery pack.

[0039] Optionally, a control method for a power system is applied to the power system in any of the above embodiments; the control method for the power system includes:

[0040] Controlling the first switch, the fourth switch, and the sixth switch to be turned on, and controlling the charge and discharge of the first sub-battery pack and the second sub-battery pack through the first electric drive module, so as to self-heat the first sub-battery pack and the second sub-battery pack;

[0041] Alternatively, the first switch, the fourth switch and the seventh switch are controlled to be turned on, and the charging and discharging of the first sub-battery pack and the second sub-battery pack are controlled by the second electric drive module to self-heat the first sub-battery pack and the second sub-battery pack.

[0042] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0043] Controlling the first switch, the fourth switch, the ninth switch, the eleventh switch and the twelfth switch to be turned on;

[0044] The first and second sub-battery packs are fully boosted and charged by the first and second electric drive modules, so as to boost and transmit the power output by the DC charge and discharge module to the first and second sub-battery packs;

[0045] Alternatively, the first and second sub-battery packs are fully voltage-reduced and discharged by the first and second electric drive modules, so as to reduce the voltage of the power output by the first and second sub-battery packs and transmit them to the DC charge and discharge module.

[0046] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0047] Controlling the fourth switch, the fifth switch, the eighth switch, the ninth switch and the tenth switch to be turned on;

[0048] The first and second sub-battery packs are fully charged by the first and second electric drive modules, so as to reduce the voltage of the power output by the DC charge and discharge module and transmit it to the first and second sub-battery packs;

[0049] Alternatively, the first and second sub-battery packs are fully boosted and discharged by the first and second electric drive modules, so as to boost the power output by the first and second sub-battery packs and transmit them to the DC charge and discharge module.

[0050] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0051] Controlling the first switch, the fourth switch, the ninth switch and the tenth switch to be turned on;

[0052] Performing full-pack direct charging control on the first sub-battery pack and the second sub-battery pack, so as to directly transmit the power output by the DC charging and discharging module to the first sub-battery pack and the second sub-battery pack;

[0053] Alternatively, the first sub-battery pack and the second sub-battery pack are subjected to full-pack direct discharge control, so that the power output by the first sub-battery pack and the second sub-battery pack is directly transmitted to the DC charging and discharging module.

[0054] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0055] When the first sub-battery pack is damaged, the second switch, the fourth switch, the ninth switch, the eleventh switch and the twelfth switch are controlled to be turned on;

[0056] Performing half-pack boost charging control on the second sub-battery pack through the first electric drive module and the second electric drive module, so as to boost the power output by the DC charge and discharge module and transmit it to the second sub-battery pack;

[0057] Alternatively, the first electric drive module and the second electric drive module perform half-pack voltage reduction and discharge control on the second sub-battery pack, so as to reduce the voltage of the power output by the second sub-battery pack and transmit it to the DC charging and discharging module.

[0058] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0059] When the second sub-battery pack is damaged, the first switch, the third switch, the ninth switch, the eleventh switch and the twelfth switch are controlled to be turned on;

[0060] Performing half-pack boost charging control on the first sub-battery pack through the first electric drive module and the second electric drive module, so as to boost the power output by the DC charge and discharge module and transmit it to the first sub-battery pack;

[0061] Alternatively, the first sub-battery pack is subjected to half-pack voltage reduction and discharge control through the first electric drive module and the second electric drive module, so as to reduce the voltage of the power output by the first sub-battery pack and transmit it to the DC charging and discharging module.

[0062] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0063] When the first sub-battery pack is damaged, the fourth switch, the sixth switch, the seventh switch, the ninth switch and the tenth switch are controlled to be turned on;

[0064] The first electric drive module and the second electric drive module are used to perform half-battery pack buck charging control to reduce the voltage of the power output by the DC charge and discharge module and transmit it to the second battery pack;

[0065] Alternatively, the first electric drive module and the second electric drive module perform half-pack boost and discharge control on the second sub-battery pack, so as to boost the power output by the second sub-battery pack and transmit it to the DC charge and discharge module.

[0066] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0067] When the second sub-battery pack is damaged, the third switch, the fifth switch, the eighth switch, the ninth switch and the tenth switch are controlled to be turned on;

[0068] Performing half-battery pack buck charging control on the first sub-battery pack through the first electric drive module and the second electric drive module, so as to buck the power output by the DC charge and discharge module and transmit it to the first sub-battery pack;

[0069] Alternatively, the first sub-battery pack is half-boosted and discharged by the first electric drive module and the second electric drive module, so as to boost the power output by the first sub-battery pack and transmit it to the DC charge and discharge module.

[0070] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0071] When the first sub-battery pack is damaged, the second switch, the fourth switch, the ninth switch and the twelfth switch are controlled to be turned on;

[0072] Performing half-pack direct charging control on the second sub-battery pack through the first electric drive module and the second electric drive module, so as to directly transmit the power output by the DC charge and discharge module to the second sub-battery pack;

[0073] Alternatively, the first electric drive module and the second electric drive module perform half-pack direct discharge control on the second sub-battery pack, so as to directly transmit the power output by the second sub-battery pack to the DC charging and discharging module.

[0074] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0075] When the second sub-battery pack is damaged, the first switch, the third switch, the ninth switch and the tenth switch are controlled to be turned on;

[0076] The first sub-battery pack is controlled to be half-charged directly through the first electric drive module and the second electric drive module, so as to directly transmit the power output by the DC charge and discharge module to the first sub-battery pack;

[0077] Alternatively, the first sub-battery pack is half-discharged directly through the first electric drive module and the second electric drive module, so that the power output by the first sub-battery pack is directly transmitted to the DC charging and discharging module.

[0078] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0079] When the first sub-battery pack is damaged, the fourth switch and the sixth switch are controlled to be turned on, and the first electric drive module performs half-pack boost control on the second sub-battery pack, and the half-pack boosted power is provided to the second electric drive module;

[0080] Alternatively, when the first sub-battery pack is damaged, the fourth switch and the seventh switch are controlled to be turned on, and the second sub-battery pack is half-boosted through the second electric drive module, and the half-boosted power is provided to the first electric drive module.

[0081] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0082] When the second sub-battery pack is damaged, the third switch and the fifth switch are controlled to be turned on, and the first sub-battery pack is half-boosted through the first electric drive module, and the half-boosted power is provided to the second electric drive module;

[0083] Alternatively, when the second sub-battery pack is damaged, the third switch and the eighth switch are controlled to be turned on, and the first sub-battery pack is half-boosted through the second electric drive module, and the half-boosted power is provided to the first electric drive module.

[0084] According to a third aspect of the present application, a vehicle is provided, the vehicle comprising a power system in any one of the above-mentioned embodiments.

[0085] The power system of the embodiment of the present application can divide the battery pack into a first sub-battery pack and a second sub-battery pack, and can control each sub-battery pack individually, so that when a sub-battery pack is damaged, it can still work based on another sub-battery pack. This can avoid the entire power system from malfunctioning when some units in the battery pack are damaged, thereby improving reliability.

[0086] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0088] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0089] Figure 1 is a schematic structural diagram of a power system provided in an exemplary embodiment of the present application;

[0090] Figure 2 is a schematic diagram of a specific circuit implementation of a power system provided in an exemplary embodiment of the present application;

[0091] Figure 3 is a schematic diagram of a battery self-heating mode provided in an exemplary embodiment of the present application;

[0092] Figure 4 is a schematic diagram of a boost charging and buck discharging mode of a full-inclusive motor provided in an exemplary embodiment of the present application;

[0093] Figure 5 is a schematic diagram of a full-package buck charging and boost discharging mode provided in an exemplary embodiment of the present application;

[0094] Figure 6 is a schematic diagram of a full-package direct charging and discharging mode provided in an exemplary embodiment of the present application;

[0095] Figure 7 is a schematic diagram of a boost charging and buck discharging mode of a half-pack motor provided in an exemplary embodiment of the present application;

[0096] Figure 8is a schematic diagram of a half-pack buck charging and boost discharging mode provided in an exemplary embodiment of the present application;

[0097] Fig. 9 is a schematic diagram of a half-pack direct charging and discharging mode provided in an exemplary embodiment of the present application;

[0098] Fig.10 is a schematic diagram of a voltage boost mode of a second sub-battery pack through a first electric drive module after a first sub-battery pack is damaged, provided in an exemplary embodiment of the present application;

[0099] Fig.11 is a schematic diagram of a voltage boost mode of a first sub-battery pack through a first electric drive module after a second sub-battery pack is damaged, provided in an exemplary embodiment of the present application;

[0100] Fig.12 is a schematic diagram of a circulation suppression path provided in an exemplary embodiment of the present application;

[0101] Fig.13 It is a schematic diagram of AC protection provided in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0102] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0103] According to the first aspect of the present application, Figure 1 As shown, a power system is provided, including a battery pack, a switch assembly and an electric drive system, wherein the battery pack includes a first sub-battery pack and a second sub-battery pack.

[0104] exist Figure 1 In the embodiment, the first sub-battery pack and the second sub-battery pack are electrically connected to the electric drive system through a switch assembly, so that at least one of the first sub-battery pack and the second sub-battery pack is controlled by the switch assembly to supply power to the electric drive system.

[0105] The switch assembly can be controlled by the vehicle controller or other controllers. It should be noted that when selecting materials, since the switch assembly is used to electrically connect the battery pack and the electric drive system, and the battery pack is usually in a high-voltage environment, it is necessary to ensure that the selected switch assembly has the corresponding pressure resistance. Under the premise of meeting the pressure resistance, the switch assembly can be a semiconductor switch or a mechanical switch.

[0106] The battery pack including the first sub-battery pack and the second sub-battery pack is only an example, and in other embodiments, it may also include a larger number of sub-battery packs. The number of sub-battery packs can match the internal structure of the switch assembly to ensure that the switch assembly can realize at least one of any number of sub-battery packs to power the electric drive system.

[0107] Among them, taking two sub-battery packs as an example, when some units in the first sub-battery pack are damaged or all are damaged, the second sub-battery pack can be connected to the electric drive system through the switch assembly, so that the second sub-battery pack can supply power to the electric drive system; similarly, when some units in the second sub-battery pack are damaged or all are damaged, the first sub-battery pack can be connected to the electric drive system through the switch assembly, so that the first sub-battery pack can supply power to the electric drive system; when both the first sub-battery pack and the second sub-battery pack are not damaged, any one or all of the first sub-battery pack and the second sub-battery pack can be connected to the electric drive system through the switch assembly, so that any one or all of the first sub-battery pack and the second sub-battery pack can supply power to the electric drive system.

[0108] The power system of the embodiment of the present application can divide the battery pack into a first sub-battery pack and a second sub-battery pack, and can control each sub-battery pack individually, so that when a sub-battery pack is damaged, it can still work based on another sub-battery pack. This can avoid the entire power system from malfunctioning when some units in the battery pack are damaged, thereby improving reliability.

[0109] like Figure 2 As shown, optionally, the switch assembly includes a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4; the positive electrode of the first sub-battery pack is electrically connected to the positive electrode input terminal of the electric drive system through the first switch K1, the negative electrode of the first sub-battery pack and the positive electrode of the second sub-battery pack are electrically connected to the first common terminal, the first common terminal is electrically connected to the positive electrode input terminal of the electric drive system through the second switch K2, the first common terminal is also electrically connected to the negative electrode input terminal of the electric drive system through the third switch K3, and the negative electrode of the second sub-battery pack is electrically connected to the negative electrode input terminal of the electric drive system through the fourth switch K4.

[0110] The lead wire corresponding to the first common terminal is used as the neutral wire of the first sub-battery pack and the second sub-battery pack, and is used to lead out the negative electrode of the first sub-battery pack and the positive electrode of the second sub-battery pack respectively. Since the first sub-battery pack and the second sub-battery pack are electrically connected in series, in order to ensure that each of the first sub-battery pack and the second sub-battery pack can independently establish an electrical connection with the electric drive system, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 mentioned above need to be respectively provided.

[0111] When the first sub-battery pack needs to be connected to the electric drive system alone, the first switch K1 and the third switch K3 can be turned on; when the second sub-battery pack needs to be connected to the electric drive system alone, the second switch K2 and the fourth switch K4 can be turned on; when the first sub-battery pack and the second sub-battery pack need to be connected to the electric drive system at the same time, the first switch K1 and the fourth switch K4 can be turned on. Thus, the corresponding power supply mode is realized according to the combination of different switches.

[0112] like Figure 2 As shown, optionally, the electric drive system includes a first electric drive module and a second electric drive module.

[0113] exist Figure 2 In the embodiment, the positive input terminal of the first electric drive module and the positive input terminal of the second electric drive module are electrically connected to the second common terminal, and the second common terminal serves as the positive input terminal of the electric drive system; the negative input terminal of the first electric drive module and the negative input terminal of the second electric drive module are electrically connected to the third common terminal, and the third common terminal serves as the negative input terminal of the electric drive system.

[0114] The first electric drive module and the second electric drive module are connected in parallel. When one of the electric drive modules fails to work normally, the other electric drive module can be used to improve the reliability of the electric drive system.

[0115] like Figure 2 As shown, optionally, the power system further includes a DC charging and discharging module, and the switch assembly further includes a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a ninth switch K9, a tenth switch K10, an eleventh switch K11 and a twelfth switch K12.

[0116] exist Figure 2 In the embodiment, the positive electrode of the first sub-battery pack is also electrically connected to the neutral end of the motor of the first electric drive module through the fifth switch K5, the first common end (such as the negative electrode of the first sub-battery pack or the positive electrode of the second sub-battery pack) is also electrically connected to the neutral end of the motor of the first electric drive module through the sixth switch K6, the first common end is also electrically connected to the neutral end of the motor of the second electric drive module through the seventh switch K7, and the positive electrode of the first sub-battery pack is also electrically connected to the neutral end of the motor of the second electric drive module through the eighth switch K8.

[0117] Among them, the sub-battery pack is electrically connected to the input and output ends of the electric drive module respectively. Based on the current direction in the electric drive module, the corresponding boost circuit or buck circuit can be realized, thereby realizing various voltage control strategies.

[0118] exist Figure 2In the embodiment, the negative electrode of the DC charge and discharge module is electrically connected to the negative electrode input terminal of the electric drive system through the ninth switch K9, the positive electrode of the DC charge and discharge module is electrically connected to the positive electrode input terminal of the electric drive system through the tenth switch K10, is electrically connected to the neutral end of the motor of the first electric drive module through the eleventh switch K11, and is electrically connected to the neutral end of the motor of the second electric drive module through the twelfth switch K12.

[0119] Among them, according to the connection relationship between the DC charging and discharging module and the sub-battery pack, the sub-battery pack can be charged and discharged. As mentioned above, based on the current direction in the electric drive module, the corresponding boost circuit or buck circuit can be realized. On this basis, combined with the DC charging and discharging module, the sub-battery pack can be further controlled by boost charging, boost discharging, buck charging, buck discharging, direct charging and direct discharging (direct charging can be understood as charging without boosting or bucking, and similarly, direct discharging can be understood as discharging without boosting or bucking) and other related working conditions.

[0120] Among them, it has been mentioned above that the first sub-battery pack and the second sub-battery pack can be controlled independently, so when the switch assembly includes the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, the eleventh switch K11 and the twelfth switch K12 at the same time, the battery pack can be charged at half of the boost voltage, discharged at half of the boost voltage, charged at half of the buck voltage, discharged at half of the buck voltage, directly charged at half of the direct discharge voltage, charged at full of the boost voltage, discharged at full of the boost voltage, charged at full of the buck voltage, discharged at full of the buck voltage, directly charged at full of the direct discharge voltage, and directly discharged at full of the boost voltage. When the battery pack includes only the first sub-battery pack and the second sub-battery pack, the half pack refers to only including any one of the first sub-battery pack and the second sub-battery pack, and the full pack refers to including both the first sub-battery pack and the second sub-battery pack.

[0121] like Figure 2 As shown, optionally, the first electric drive module includes a first bus capacitor C1, a first power module and a first motor MOTOR1, and the second electric drive module includes a second bus capacitor C2, a second power module and a second motor MOTOR2.

[0122] exist Figure 2 In the embodiment, the first end of the first bus capacitor C1 and the positive input end of the first power module are electrically connected to the fourth common end, and the fourth common end serves as the positive input end of the first electric drive module. The second end of the first bus capacitor C1 and the negative input end of the first power module are electrically connected to the fifth common end, and the fifth common end serves as the negative input end of the first electric drive module. The output end of the first power module is electrically connected to the first motor MOTOR1.

[0123] exist Figure 2In the embodiment, the first end of the second bus capacitor C2 and the positive input end of the second power module are electrically connected to the sixth common end, and the sixth common end serves as the positive input end of the second electric drive module. The second end of the second bus capacitor C2 and the negative input end of the second power module are electrically connected to the seventh common end, and the seventh common end serves as the negative input end of the second electric drive module. The output end of the second power module is electrically connected to the second motor MOTOR2.

[0124] Among them, the first bus capacitor C1 is connected in parallel to the input end of the first power module to serve as the input end of the first electric drive module, and the second bus capacitor C2 is connected in parallel to the input end of the second power module to serve as the input end of the second electric drive module. The above embodiments have mentioned that the first electric drive module and the second electric drive module are arranged in parallel to play a backup role. In this embodiment, the first bus capacitor C1 and the second bus capacitor C2 arranged in parallel in the first electric drive module and the second electric drive module can still play a backup role. When the first bus capacitor C1 fails to work normally, the first electric drive module can continue to work using the second bus capacitor C2 in the second electric drive module; similarly, when the second bus capacitor C2 fails to work normally, the second electric drive module can continue to work using the first bus capacitor C1 in the first electric drive module.

[0125] The dual bus capacitors greatly improve safety, and the dual electric drives can still work normally when one of them is damaged.

[0126] like Figure 2 As shown, optionally, the first electric drive module further includes a first inductor L1, and the second electric drive module further includes a second inductor L2.

[0127] exist Figure 2 In the embodiment, the first end of the first inductor L1 serves as the positive input end of the first electric drive module, and the second end of the first inductor L1 is electrically connected to the first end of the first bus capacitor C1 and the positive input end of the first power module respectively; the first end of the second inductor L2 serves as the positive input end of the second electric drive module, and the second end of the second inductor L2 is electrically connected to the first end of the second bus capacitor C2 and the positive input end of the second power module respectively.

[0128] Among them, the above embodiments have mentioned that the configuration of dual bus capacitors can improve safety and ensure that the dual electric drive can still work normally after one of them is damaged. However, dual bus capacitors are prone to cause circulating current problems. Specifically, the circulating current problem of dual capacitors refers to that in some capacitor circuits, when two capacitors are connected together, a closed loop is formed, causing current to circulate in this loop. The circulating current problem can cause specific problems such as energy loss and heat generation. In response to this problem, the present embodiment adds a first inductor L1 and a second inductor L2, so as to suppress the circulating current, solve the circulating current problem to a certain extent, and avoid energy loss and heat generation as much as possible.

[0129] Optionally, the electric drive system includes a power module, a motor and a fuse unit.

[0130] The positive input terminal of the power module serves as the positive input terminal of the electric drive system, the negative input terminal of the power module serves as the negative input terminal of the electric drive system, and the output terminal of the power module is electrically connected to the motor; the insurance unit is connected in series with the power module and the motor, and is used to disconnect when the current flowing through exceeds a threshold within a preset time.

[0131] Among them, if the power module cannot disconnect from the motor during the reverse drag process of the motor, the large current generated may cause the power module to catch fire, thus posing a huge safety hazard.

[0132] Among them, the insurance unit is mainly used to achieve overcurrent protection. During the reverse drag process of the motor, the large current generated will disconnect the insurance unit, thereby cutting off the line between the power module and the motor, preventing the power module from continuously bearing large currents and catching fire. In addition, when the insurance unit is applied to the dual electric drive, a corresponding insurance unit can be set for each electric drive module, so that when a certain electric drive module fails (including overcurrent or short circuit), the electric drive module can be cut off, thereby ensuring that the other electric drive module can still work normally, improving the independence of the electric drive module.

[0133] like Figure 2 As shown, optionally, in the dual electric drive architecture, the insurance unit includes a first insurance device (including insurance device FU1 and insurance device FU2) and a second insurance device (including insurance device FU3 and insurance device FU4).

[0134] exist Figure 2 In the figure, the first end of the fuse device FU1 serves as the positive input end of the first electric drive module, the second end of the fuse device FU1 is electrically connected to the positive input end of the first power module, the output end of the first power module is electrically connected to the first end of the fuse device FU3, and the second end of the fuse device FU3 is electrically connected to the first motor MOTOR1.

[0135] exist Figure 2 In the figure, the first end of the fuse device FU2 serves as the positive input end of the second electric drive module, the second end of the fuse device FU2 is electrically connected to the positive input end of the second power module, the output end of the second power module is electrically connected to the first end of the fuse device FU4, and the second end of the fuse device FU4 is electrically connected to the second motor MOTOR2.

[0136] Among them, the fuse device FU1 and the fuse device FU2 are respectively used as the fuse devices of the DC side of the first power module and the second power module, and the fuse device FU3 and the fuse device FU4 are respectively used as the fuse devices of the AC side of the first power module and the second power module. Since the AC side is usually three-phase AC, the fuse device FU3 and the fuse device FU4 are respectively composed of three sub-fuse devices, and each sub-fuse device is connected in series to the corresponding phase power.

[0137] Among them, the insurance device can be a "passive protection" fuse, or an "active protection" insurance device, etc.

[0138] like Figure 2 As shown, optionally, in the dual electric drive architecture, the first electric drive module includes a first power module, a first motor MOTOR1 and a first common-mode magnetic ring MR2, and the second electric drive module includes a second power module, a second motor MOTOR2 and a second common-mode magnetic ring MR3.

[0139] exist Figure 2 In the embodiment, the positive input terminal of the first power module serves as the positive input terminal of the first electric drive module, the negative input terminal of the first power module serves as the negative input terminal of the first electric drive module, the output terminal of the first power module is electrically connected to the first motor MOTOR1, and the first common mode magnetic ring MR2 is disposed between the output terminal of the first power module and the first motor MOTOR1.

[0140] exist Figure 2 In the figure, the positive input terminal of the second power module serves as the positive input terminal of the second electric drive module, the negative input terminal of the second power module serves as the negative input terminal of the second electric drive module, the output terminal of the second power module is electrically connected to the second motor MOTOR2, and the second common mode magnetic ring MR3 is disposed between the output terminal of the second power module and the second motor MOTOR2.

[0141] Among them, when the voltage change rate of the AC side of the power module is high, shaft current will be generated at the motor bearing, thereby reducing the service life of the motor. Therefore, in view of this situation, the present embodiment adds a first common mode magnetic ring MR2 and a second common mode magnetic ring MR3, so as to reduce the shaft current corresponding to the first power module and the shaft current corresponding to the second power module, respectively, thereby increasing the service life of the motor.

[0142] like Figure 2 As shown, optionally, the electric drive system further includes a first differential mode capacitor CX1, a first common mode capacitor CY1, a second common mode capacitor CY2, a third common mode capacitor CY3, a fourth common mode capacitor CY4 and a DC magnetic ring MR1.

[0143] exist Figure 2In the figure, the first differential mode capacitor CX1 is electrically connected between the positive electrode of the first sub-battery pack and the negative electrode of the second sub-battery pack, the first common mode capacitor CY1 and the second common mode capacitor CY2 are electrically connected between the positive electrode of the first sub-battery pack and the power ground, the third common mode capacitor CY3 and the fourth common mode capacitor CY4 are electrically connected between the negative electrode of the second sub-battery pack and the power ground, and the DC magnetic ring MR1 is arranged between the battery pack and the electric drive module.

[0144] Among them, the first differential mode capacitor CX1 is used to filter the differential mode noise signal between the battery pack and the electric drive module, the first common mode capacitor CY1, the second common mode capacitor CY2, the third common mode capacitor CY3, and the fourth common mode capacitor CY4 are respectively used to filter the common mode noise signals between the battery pack and the electric drive module, and the DC magnetic ring MR1 is used to achieve magnetic field shielding on the DC side to improve reliability.

[0145] like Figure 2 As shown, optionally, the DC charge and discharge module includes a DC charge and discharge port and a DC charge and discharge electromagnetic ring MR4, a second differential mode capacitor CX2, a fifth common mode capacitor CY5, a sixth common mode capacitor CY6 and a boost capacitor C3.

[0146] exist Figure 2 In the figure, the positive and negative electrodes of the DC charge and discharge port serve as the positive and negative electrodes of the DC charge and discharge module respectively, the second differential mode capacitor CX2 and the boost capacitor C3 are electrically connected between the positive and negative electrodes of the DC charge and discharge port respectively, the fifth common mode capacitor CY5 is electrically connected between the negative electrode of the DC charge and discharge port and the power ground, the sixth common mode capacitor CY6 is electrically connected between the positive electrode of the DC charge and discharge port and the power ground, and the DC charge and discharge electromagnetic ring MR4 is arranged between the DC charge and discharge port and the battery pack.

[0147] Among them, the second differential mode capacitor CX2 is used to filter out the differential mode noise signal between the DC charge and discharge port and the battery pack, the fifth common mode capacitor CY5 and the sixth common mode capacitor CY6 are respectively used to filter out the common mode noise signal between the DC charge and discharge port and the battery pack, the boost capacitor C3 is used to stabilize the voltage between the positive and negative poles of the DC charge and discharge port, and the DC charge and discharge electromagnetic ring MR4 is used to achieve magnetic field shielding of the DC charge and discharge port to improve reliability.

[0148] According to a second aspect of the present application, a control method for a power system is provided, and the control method for a power system is applied to the power system in any of the above embodiments; the control method for the power system includes:

[0149] Detecting the health status of the first sub-battery pack and the second sub-battery pack;

[0150] The health status refers to whether the sub-battery pack is damaged, which can be detected by the battery management system. The health status includes three situations. The first situation indicates that both the first sub-battery pack and the second sub-battery pack are not damaged, the second situation indicates that the first sub-battery pack is damaged but the second sub-battery pack is not damaged, and the third situation indicates that the first sub-battery pack is not damaged but the second sub-battery pack is damaged.

[0151] The connection and disconnection of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system are controlled according to the health status, so as to supply power to the electric drive system through at least one of the first sub-battery pack and the second sub-battery pack.

[0152] Among them, according to the health status, the undamaged sub-battery pack can be controlled to supply power to the electric drive system.

[0153] Reference Figure 2 Optionally, controlling the on / off of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system respectively according to the health status includes:

[0154] When the first sub-battery pack and the second sub-battery pack are both intact:

[0155] Controlling the first switch K1 to be turned on and the fourth switch K4 to be turned on, so as to provide power to the electric drive system through the first sub-battery pack and the second sub-battery pack;

[0156] Alternatively, the first switch K1 and the third switch K3 are controlled to be turned on, and power is provided to the electric drive system through the first sub-battery pack;

[0157] Alternatively, the second switch K2 and the fourth switch K4 are controlled to be turned on, and power is provided to the electric drive system through the second sub-battery pack.

[0158] Reference Figure 2 Optionally, controlling the on / off of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system respectively according to the health status includes:

[0159] When the second sub-battery pack is damaged but the first sub-battery pack is not damaged, the first switch K1 is controlled to be turned on and the third switch K3 is controlled to be turned on, and power is provided to the electric drive system through the first sub-battery pack;

[0160] When the first sub-battery pack is damaged but the second sub-battery pack is not damaged, the second switch K2 and the fourth switch K4 are controlled to be turned on, and power is provided to the electric drive system through the second sub-battery pack.

[0161] Reference Figure 3 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0162] The first switch K1 , the fourth switch K4 and the sixth switch K6 are controlled to be turned on, and the first sub-battery pack and the second sub-battery pack are controlled to be charged and discharged through the first electric drive module, so as to self-heat the first sub-battery pack and the second sub-battery pack.

[0163] Among them, when the first switch K1, the fourth switch K4 and the sixth switch K6 are turned on, the first electric drive module provides a circuit for charging and discharging between the first sub-battery pack and the second sub-battery pack. The first sub-battery pack charges and stores energy for the first motor MOTOR1 through the first power module, and then controls the first power module to release the energy in the first motor MOTOR1 to the second sub-battery pack. The current path and direction are as follows: Figure 3 As shown, the red color can be understood as the charging current of the first motor MOTOR1 , and the blue color can be understood as the discharging current of the first motor MOTOR1 .

[0164] When the second sub-battery pack is discharged and the first sub-battery pack is charged, the corresponding current direction is Figure 3 The direction shown is opposite.

[0165] Alternatively, the first switch K1 , the fourth switch K4 and the seventh switch K7 are controlled to be turned on, and the first sub-battery pack and the second sub-battery pack are controlled to be charged and discharged through the second electric drive module, so as to self-heat the first sub-battery pack and the second sub-battery pack.

[0166] Among them, the principle and current direction of realizing self-heating through the first electric drive module have been described in detail above, and the second electric drive module can realize the same function as the first electric drive module. The specific principle and current direction can refer to the above-mentioned first electric drive module.

[0167] Among them, the first sub-battery pack and the second sub-battery pack are charged and discharged through the electric drive module, so as to achieve the purpose of self-heating. It can be applied to multiple working conditions such as vehicle driving, parking, and charging, greatly improving the vehicle's endurance.

[0168] Reference Figure 4 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0169] The first switch K1 , the fourth switch K4 , the ninth switch K9 , the eleventh switch K11 and the twelfth switch K12 are controlled to be turned on.

[0170] The first and second sub-battery packs are fully boosted and charged by the first and second electric drive modules, so that the power output by the DC charge and discharge module is boosted and transmitted to the first and second sub-battery packs.

[0171] Among them, when the first switch K1, the fourth switch K4, the ninth switch K9, the eleventh switch K11 and the twelfth switch K12 are turned on, the low-voltage power output by the DC charging and discharging port can form a BOOST circuit with the first electric drive module and the second electric drive module to increase the voltage to charge the entire battery pack, thereby realizing the function of motor boost charging. The current path and direction are as follows: Figure 4 As shown, the red color can be understood as the current corresponding to the first electric drive module, and the blue color can be understood as the current corresponding to the second electric drive module. In actual use, one-phase boost, two-phase boost or three-phase boost can be started according to the size of the charging power; in which, under the one-phase boost charging condition, only one winding in the motor and one bridge arm of the power module connected to it are used; under the two-phase boost charging condition, two sets of windings in the motor and two bridge arms of the power module connected to it are used; under the three-phase boost charging condition, three windings of the motor and three bridge arms of the inverter circuit are used.

[0172] Alternatively, the first and second sub-battery packs are fully voltage-reduced and discharged by the first and second electric drive modules, so as to reduce the voltage of the power output by the first and second sub-battery packs and transmit them to the DC charge and discharge module.

[0173] Similarly, when the current path is reversed, the voltage of the entire battery pack can be stepped down and output to the DC charging and discharging port through the first electric drive module and the second electric drive module.

[0174] Reference Figure 5 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0175] The fourth switch K4 , the fifth switch K5 , the eighth switch K8 , the ninth switch K9 and the tenth switch K10 are controlled to be turned on.

[0176] The first and second sub-battery packs are fully charged and controlled by the first and second electric drive modules to reduce the voltage of the power output by the DC charge and discharge module and transmit it to the first and second sub-battery packs.

[0177] Among them, when the fourth switch K4, the fifth switch K5, the eighth switch K8, the ninth switch K9 and the tenth switch K10 are turned on, the high-voltage power output from the DC charging and discharging port can form a BUCK circuit with the first electric drive module and the second electric drive module to reduce the voltage to charge the entire battery pack, thereby realizing the function of motor voltage reduction charging. The current path and direction are as follows: Figure 5As shown, the red color can be understood as the current corresponding to the first electric drive module, and the blue color can be understood as the current corresponding to the second electric drive module. In actual use, one-phase buck, two-phase buck or three-phase buck can be started according to the size of the charging power; in which, under the one-phase buck charging condition, only one winding in the motor and one bridge arm of the power module connected to it are used; under the two-phase buck charging condition, two sets of windings in the motor and two bridge arms of the power module connected to it are used; under the three-phase buck charging condition, three windings of the motor and three bridge arms of the inverter circuit are used.

[0178] Alternatively, the first and second sub-battery packs are fully boosted and discharged by the first and second electric drive modules, so as to boost the power output by the first and second sub-battery packs and transmit them to the DC charge and discharge module.

[0179] Similarly, when the current path is reversed, the voltage of the entire battery pack can be boosted and output to the DC charging and discharging port through the first electric drive module and the second electric drive module.

[0180] Reference Figure 6 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0181] The first switch K1 , the fourth switch K4 , the ninth switch K9 and the tenth switch K10 are controlled to be turned on.

[0182] The first sub-battery pack and the second sub-battery pack are directly charged in full packs to directly transmit the power output by the DC charging and discharging module to the first sub-battery pack and the second sub-battery pack.

[0183] When the first switch K1, the fourth switch K4, the ninth switch K9 and the tenth switch K10 are turned on, the DC charging and discharging port can directly charge the entire battery pack. The current path and direction are as follows: Figure 6 shown.

[0184] Alternatively, the first sub-battery pack and the second sub-battery pack are subjected to full-pack direct discharge control, so that the power output by the first sub-battery pack and the second sub-battery pack is directly transmitted to the DC charging and discharging module.

[0185] Similarly, if the current path is reversed, the voltage of the entire battery pack can be output to the DC charging and discharging port through DC.

[0186] Reference Figure 7 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0187] When the first sub-battery pack is damaged, the second switch K2 , the fourth switch K4 , the ninth switch K9 , the eleventh switch K11 and the twelfth switch K12 are controlled to be turned on.

[0188] The first electric drive module and the second electric drive module perform half-pack boost charging control on the second sub-battery pack, so as to boost the power output by the DC charge and discharge module and transmit it to the second sub-battery pack.

[0189] Among them, when the second switch K2, the fourth switch K4, the ninth switch K9, the eleventh switch K11 and the twelfth switch K12 are turned on, the low-voltage power output by the DC charging and discharging port can form a BOOST circuit with the first electric drive module and the second electric drive module to increase the voltage to charge the second sub-battery pack, thereby realizing the function of boosting and charging the motor of the second sub-battery pack. The current path and direction are as follows: Figure 7 As shown, the red color can be understood as the current corresponding to the first electric drive module, and the blue color can be understood as the current corresponding to the second electric drive module. In actual use, one-phase boost, two-phase boost or three-phase boost can be started according to the size of the charging power; in which, under the one-phase boost charging condition, only one winding in the motor and one bridge arm of the power module connected to it are used; under the two-phase boost charging condition, two sets of windings in the motor and two bridge arms of the power module connected to it are used; under the three-phase boost charging condition, three windings of the motor and three bridge arms of the inverter circuit are used.

[0190] Alternatively, the first electric drive module and the second electric drive module perform half-pack voltage reduction and discharge control on the second sub-battery pack, so as to reduce the voltage of the power output by the second sub-battery pack and transmit it to the DC charging and discharging module.

[0191] Similarly, when the current path is reversed, the voltage of the second sub-battery pack can be stepped down and output to the DC charging and discharging port through the first electric drive module and the second electric drive module.

[0192] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0193] When the second sub-battery pack is damaged, the first switch, the third switch, the ninth switch, the eleventh switch and the twelfth switch are controlled to be turned on;

[0194] Performing half-pack boost charging control on the first sub-battery pack through the first electric drive module and the second electric drive module, so as to boost the power output by the DC charge and discharge module and transmit it to the first sub-battery pack;

[0195] Alternatively, the first sub-battery pack is subjected to half-pack voltage reduction and discharge control through the first electric drive module and the second electric drive module, so as to reduce the voltage of the power output by the first sub-battery pack and transmit it to the DC charging and discharging module.

[0196] Among them, when the second sub-battery pack is damaged, the first sub-battery pack can be used to perform half-pack boost charging and half-pack buck discharging. The specific principle and current direction can be referred to the above-mentioned content and drawings of half-pack boost charging and half-pack buck discharging through the second sub-battery pack, and will not be repeated here.

[0197] Reference Figure 8 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0198] When the first sub-battery pack is damaged, the fourth switch K4 , the sixth switch K6 , the seventh switch K7 , the ninth switch K9 and the tenth switch K10 are controlled to be turned on.

[0199] The first electric drive module and the second electric drive module are used to perform half-pack buck charging control on the second sub-battery pack, so as to buck the power output by the DC charge and discharge module and transmit it to the second sub-battery pack.

[0200] Among them, when the fourth switch K4, the sixth switch K6, the seventh switch K7, the ninth switch K9 and the tenth switch K10 are turned on, the high-voltage power supply output by the DC charging and discharging port can form a BUCK circuit with the first electric drive module and the second electric drive module to reduce the voltage to charge the second sub-battery pack, thereby realizing the function of step-down charging of the second sub-battery pack motor. The current path and direction are as follows: Figure 8 As shown, the red color can be understood as the current corresponding to the first electric drive module, and the blue color can be understood as the current corresponding to the second electric drive module. In actual use, one-phase buck, two-phase buck or three-phase buck can be started according to the size of the charging power; in which, under the one-phase buck charging condition, only one winding in the motor and one bridge arm of the power module connected to it are used; under the two-phase buck charging condition, two sets of windings in the motor and two bridge arms of the power module connected to it are used; under the three-phase buck charging condition, three windings of the motor and three bridge arms of the inverter circuit are used.

[0201] Alternatively, the first electric drive module and the second electric drive module perform half-pack boost and discharge control on the second sub-battery pack, so as to boost the power output by the second sub-battery pack and transmit it to the DC charge and discharge module.

[0202] Similarly, when the current path is reversed, the voltage of the second sub-battery pack can be boosted and output to the DC charging and discharging port through the first electric drive module and the second electric drive module.

[0203] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0204] When the second sub-battery pack is damaged, the third switch, the fifth switch, the eighth switch, the ninth switch and the tenth switch are controlled to be turned on;

[0205] Performing half-battery pack buck charging control on the first sub-battery pack through the first electric drive module and the second electric drive module, so as to buck the power output by the DC charge and discharge module and transmit it to the first sub-battery pack;

[0206] Alternatively, the first sub-battery pack is half-boosted and discharged by the first electric drive module and the second electric drive module, so as to boost the power output by the first sub-battery pack and transmit it to the DC charge and discharge module.

[0207] Among them, when the second sub-battery pack is damaged, the first sub-battery pack can be used to perform half-pack buck charging and half-pack boost discharging. The specific principle and current direction can be referred to the above-mentioned content and drawings of half-pack buck charging and half-pack boost discharging through the second sub-battery pack, and will not be repeated here.

[0208] Reference Fig. 9 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0209] When the first sub-battery pack is damaged, the second switch K2 , the fourth switch K4 , the ninth switch K9 and the twelfth switch K12 are controlled to be turned on.

[0210] The first electric drive module and the second electric drive module are used to perform half-pack direct charging control on the second sub-battery pack, so that the power output by the DC charging and discharging module is directly transmitted to the second sub-battery pack.

[0211] When the second switch K2, the fourth switch K4, the ninth switch K9 and the twelfth switch K12 are turned on, the DC charging and discharging port can directly charge the second sub-battery pack. The current path and direction are as follows: Fig. 9 shown.

[0212] Alternatively, the first electric drive module and the second electric drive module perform half-pack direct discharge control on the second sub-battery pack, so as to directly transmit the power output by the second sub-battery pack to the DC charging and discharging module.

[0213] Similarly, if the current path is reversed, the voltage of the entire second sub-battery pack can be output to the DC charge and discharge port via DC.

[0214] Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0215] When the second sub-battery pack is damaged, the first switch, the third switch, the ninth switch and the tenth switch are controlled to be turned on;

[0216] The first sub-battery pack is controlled to be half-charged directly through the first electric drive module and the second electric drive module, so as to directly transmit the power output by the DC charge and discharge module to the first sub-battery pack;

[0217] Alternatively, the first sub-battery pack is half-discharged directly through the first electric drive module and the second electric drive module, so that the power output by the first sub-battery pack is directly transmitted to the DC charging and discharging module.

[0218] Among them, when the second sub-battery pack is damaged, half of the pack can be directly charged and half of the pack can be directly discharged through the first sub-battery pack. The specific principle and current direction can refer to the above-mentioned content and drawings of half-pack direct charging and half-pack direct discharge through the second sub-battery pack, and will not be repeated here.

[0219] Reference Fig.10 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0220] When the first sub-battery pack is damaged, the fourth switch K4 and the sixth switch K6 are controlled to be turned on, and the first electric drive module controls the half-pack boosting of the second sub-battery pack, and provides the half-pack boosted power to the second electric drive module.

[0221] When the fourth switch K4 and the sixth switch K6 are turned on, the second sub-battery pack and the first electric drive module form a BOOST circuit, and the second sub-battery pack increases the voltage to supply power to the second electric drive module. The flow path and direction are as follows: Fig.10 As shown, the red color can be understood as the current corresponding to the first electric drive module, and the blue color can be understood as the current corresponding to the second electric drive module.

[0222] Alternatively, when the first sub-battery pack is damaged, the fourth switch and the seventh switch are controlled to be turned on, and the second sub-battery pack is half-boosted through the second electric drive module, and the half-boosted power is provided to the first electric drive module.

[0223] Among them, similarly, the second sub-battery pack can also form a BOOST circuit with the second electric drive module. The second sub-battery pack increases the voltage to supply power to the first electric drive module. The specific principle and current direction can refer to the relevant content and drawings of the second sub-battery pack and the first electric drive module forming a BOOST circuit, which will not be repeated here.

[0224] Reference Fig.11 Optionally, the control method of the power system is applied to the power system in any of the above embodiments; the control method of the power system includes:

[0225] When the second sub-battery pack is damaged, the third switch K3 and the fifth switch K5 are controlled to be turned on, and the first sub-battery pack is half-boosted through the first electric drive module, and the half-boosted power is provided to the second electric drive module.

[0226] When the third switch K3 and the fifth switch K5 are turned on, the first sub-battery pack and the first electric drive module form a BOOST circuit, and the first sub-battery pack increases the voltage to supply power to the second electric drive module. The flow path and direction are as follows: Fig.11 As shown, the red color can be understood as the current corresponding to the first electric drive module, and the blue color can be understood as the current corresponding to the second electric drive module.

[0227] Alternatively, when the second sub-battery pack is damaged, the third switch and the eighth switch are controlled to be turned on, and the first sub-battery pack is half-boosted through the second electric drive module, and the half-boosted power is provided to the first electric drive module.

[0228] Among them, similarly, the first sub-battery pack can also form a BOOST circuit with the second electric drive module. The first sub-battery pack increases the voltage to supply power to the first electric drive module. The specific principle and current direction can refer to the relevant content and drawings of the first sub-battery pack and the first electric drive module forming the BOOST circuit, which will not be repeated here.

[0229] Reference Fig.12 The first inductor L1 and the second inductor L2 can suppress the circulating current problem caused by the charging and discharging of the first bus capacitor C1 and the second bus capacitor C2 during the operation of the system. Fig.12 This is a circulation diagram. The direction of the arrow is only an example. The actual circulation is not limited to this direction.

[0230] When a short circuit occurs in a bridge arm of a certain phase, if the motor is still rotating at high speed, the energy in the motor will be fed back to the DC side of the electric drive system through the power module. At this time, the current in the power module will be very large. At this time, the output circuit of the power module must be disconnected through the fuse on the AC side to avoid explosion or even fire of the electric drive system. In addition, when the wafer of a bridge arm of a certain phase is damaged and the silicone gel is destroyed, a safe electrical gap cannot be guaranteed. If the opposite bridge arm enters a three-phase short circuit state at this time, it is very easy to generate an arc at the damaged silicone gel. At this time, the connection between the power module and the motor must be disconnected through the fuse on the AC side to avoid explosion or even fire of the electric drive system. Reference Fig.13 When a short circuit occurs in a bridge arm of a phase in the first power module, the motor is still rotating at a high speed, and the corresponding fuse FU3 will be disconnected in time under specific conditions.

[0231] According to a third aspect of the present application, a vehicle is provided, the vehicle comprising a power system in any one of the above-mentioned embodiments.

[0232] The vehicle may be a pure electric vehicle, a plug-in hybrid vehicle, a range-extended hybrid vehicle or other new energy vehicle, and this application does not make any specific limitation on this.

[0233] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0234] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0235] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0236] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. In the embodiments of the present application, the description of each embodiment has its own focus. For the parts not described in detail in a certain embodiment, please refer to the relevant contents of other embodiments. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power system, characterized in that: It includes a battery pack, a switch assembly and an electric drive system, wherein the battery pack includes a first sub-battery pack and a second sub-battery pack; The first sub-battery pack and the second sub-battery pack are electrically connected to the electric drive system through the switch assembly, so that at least one of the first sub-battery pack and the second sub-battery pack is controlled by the switch assembly to supply power to the electric drive system; The switch assembly includes a first switch, a second switch, a third switch and a fourth switch; the positive electrode of the first sub-battery pack is electrically connected to the positive input terminal of the electric drive system through the first switch, the negative electrode of the first sub-battery pack and the positive electrode of the second sub-battery pack are electrically connected to a first common terminal, the first common terminal is electrically connected to the positive input terminal of the electric drive system through the second switch, the first common terminal is also electrically connected to the negative input terminal of the electric drive system through the third switch, and the negative electrode of the second sub-battery pack is electrically connected to the negative input terminal of the electric drive system through the fourth switch; The electric drive system includes a first electric drive module and a second electric drive module; The positive input terminal of the first electric drive module and the positive input terminal of the second electric drive module are electrically connected to a second common terminal, and the second common terminal serves as the positive input terminal of the electric drive system; The negative input terminal of the first electric drive module and the negative input terminal of the second electric drive module are electrically connected to a third common terminal, and the third common terminal serves as the negative input terminal of the electric drive system; The power system further includes a DC charging and discharging module, and the switch assembly includes a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch; The positive electrode of the first sub-battery pack is also electrically connected to the neutral end of the motor of the first electric drive module through the fifth switch, the first common end is also electrically connected to the neutral end of the motor of the first electric drive module through the sixth switch, the first common end is also electrically connected to the neutral end of the motor of the second electric drive module through the seventh switch, and the positive electrode of the first sub-battery pack is also electrically connected to the neutral end of the motor of the second electric drive module through the eighth switch; The negative pole of the DC charge and discharge module is electrically connected to the negative pole input terminal of the electric drive system through the ninth switch, the positive pole of the DC charge and discharge module is electrically connected to the positive pole input terminal of the electric drive system through the tenth switch, is electrically connected to the neutral terminal of the motor of the first electric drive module through the eleventh switch, and is electrically connected to the neutral terminal of the motor of the second electric drive module through the twelfth switch.

2. The power system according to claim 1, characterized in that: The first electric drive module includes a first bus capacitor, a first power module and a first motor, and the second electric drive module includes a second bus capacitor, a second power module and a second motor; The first end of the first bus capacitor and the positive input end of the first power module are electrically connected to a fourth common end, and the fourth common end serves as the positive input end of the first electric drive module. The second end of the first bus capacitor and the negative input end of the first power module are electrically connected to a fifth common end, and the fifth common end serves as the negative input end of the first electric drive module. The output end of the first power module is electrically connected to the first motor. The first end of the second bus capacitor and the positive input end of the second power module are electrically connected to the sixth common end, and the sixth common end serves as the positive input end of the second electric drive module. The second end of the second bus capacitor and the negative input end of the second power module are electrically connected to the seventh common end, and the seventh common end serves as the negative input end of the second electric drive module. The output end of the second power module is electrically connected to the second motor.

3. The power system according to claim 2, characterized in that: The first electric drive module further includes a first inductor, and the second electric drive module further includes a second inductor; The first end of the first inductor serves as the positive input end of the first electric drive module, and the second end of the first inductor is electrically connected to the first end of the first bus capacitor and the positive input end of the first power module respectively; The first end of the second inductor serves as the positive input end of the second electric drive module, and the second end of the second inductor is electrically connected to the first end of the second bus capacitor and the positive input end of the second power module respectively.

4. The power system according to claim 1, characterized in that: The first electric drive module or the second electric drive module in the electric drive system includes a power module, a motor and a fuse unit; The positive input terminal of the power module serves as the positive input terminal of the electric drive system, the negative input terminal of the power module serves as the negative input terminal of the electric drive system, and the output terminal of the power module is electrically connected to the motor; The insurance unit is connected in series with the power module and the motor, and is used to disconnect when the current flowing through exceeds a threshold within a preset time.

5. The power system according to claim 4, characterized in that: The insurance unit comprises a first insurance device and a second insurance device; The first end of the first fuse device serves as the positive input end of the electric drive system, the second end of the first fuse device is electrically connected to the positive input end of the power module, the output end of the power module is electrically connected to the first end of the second fuse device, and the second end of the second fuse device is electrically connected to the motor.

6. The power system according to claim 1, characterized in that: The first electric drive module or the second electric drive module in the electric drive system includes a power module, a motor and a common mode magnetic ring; The positive input terminal of the power module serves as the positive input terminal of the electric drive system, the negative input terminal of the power module serves as the negative input terminal of the electric drive system, and the output terminal of the power module is electrically connected to the motor; The common mode magnetic ring is sleeved between the output end of the power module and the motor.

7. A control method for a power system, characterized in that: The control method of the power system is applied to the power system according to any one of claims 1 to 6; the control method of the power system comprises: Detecting the health status of the first sub-battery pack and the second sub-battery pack; The connection and disconnection of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system are controlled according to the health status, so as to supply power to the electric drive system through at least one of the first sub-battery pack and the second sub-battery pack.

8. The control method of the power system according to claim 7, characterized in that: The controlling the connection and disconnection of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system respectively according to the health state includes: When both the first sub-battery pack and the second sub-battery pack are not damaged: Controlling the first switch to be turned on and the fourth switch to be turned on, so that the first sub-battery pack and the second sub-battery pack provide power to the electric drive system; or controlling the first switch to be turned on and the third switch to be turned on, so that the first sub-battery pack provides power to the electric drive system; Alternatively, the second switch and the fourth switch are controlled to be turned on, and power is provided to the electric drive system through the second sub-battery pack.

9. The control method of the power system according to claim 7, characterized in that: The controlling the connection and disconnection of the lines between the first sub-battery pack and the second sub-battery pack and the electric drive system respectively according to the health state includes: When the second sub-battery pack is damaged but the first sub-battery pack is not damaged, controlling the first switch to be turned on and the third switch to be turned on, so as to provide power to the electric drive system through the first sub-battery pack; When the first sub-battery pack is damaged but the second sub-battery pack is not damaged, the second switch and the fourth switch are controlled to be turned on, and power is provided to the electric drive system through the second sub-battery pack.

10. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: Controlling the first switch, the fourth switch, and the sixth switch to be turned on, and controlling the charge and discharge of the first sub-battery pack and the second sub-battery pack through the first electric drive module, so as to self-heat the first sub-battery pack and the second sub-battery pack; Alternatively, the first switch, the fourth switch and the seventh switch are controlled to be turned on, and the first sub-battery pack and the second sub-battery pack are controlled to be charged and discharged through the second electric drive module, so as to self-heat the first sub-battery pack and the second sub-battery pack.

11. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: controlling the first switch, the fourth switch, the ninth switch, the eleventh switch and the twelfth switch to be turned on; The first electric drive module and the second electric drive module are used to perform full-pack boost charging control on the first sub-battery pack and the second sub-battery pack, so as to boost the power output by the DC charge and discharge module and transmit it to the first sub-battery pack and the second sub-battery pack; Alternatively, the first electric drive module and the second electric drive module perform full-pack voltage reduction and discharge control on the first sub-battery pack and the second sub-battery pack, so as to reduce the voltage of the power output by the first sub-battery pack and the second sub-battery pack and transmit it to the DC charging and discharging module.

12. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: controlling the fourth switch, the fifth switch, the eighth switch, the ninth switch and the tenth switch to be turned on; The first electric drive module and the second electric drive module are used to perform full-pack buck charging control on the first sub-battery pack and the second sub-battery pack, so as to buck the power output by the DC charge and discharge module and transmit it to the first sub-battery pack and the second sub-battery pack; Alternatively, the first electric drive module and the second electric drive module perform full-pack boost and discharge control on the first sub-battery pack and the second sub-battery pack, so as to boost the power output by the first sub-battery pack and the second sub-battery pack and transmit it to the DC charge and discharge module.

13. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: Controlling the first switch, the fourth switch, the ninth switch and the tenth switch to be turned on; Performing full-pack direct charging control on the first sub-battery pack and the second sub-battery pack, so as to directly transmit the power output by the DC charging and discharging module to the first sub-battery pack and the second sub-battery pack; Alternatively, the first sub-battery pack and the second sub-battery pack are subjected to full-pack direct discharge control, so that the power output by the first sub-battery pack and the second sub-battery pack is directly transmitted to the DC charging and discharging module.

14. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the first sub-battery pack is damaged, controlling the second switch, the fourth switch, the ninth switch, the eleventh switch and the twelfth switch to be turned on; Performing half-pack boost charging control on the second sub-battery pack through the first electric drive module and the second electric drive module, so as to boost the power output by the DC charge and discharge module and transmit it to the second sub-battery pack; Alternatively, the first electric drive module and the second electric drive module perform half-pack voltage reduction discharge control on the second sub-battery pack, so as to reduce the voltage of the power output by the second sub-battery pack and transmit it to the DC charging and discharging module.

15. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the second sub-battery pack is damaged, controlling the first switch, the third switch, the ninth switch, the eleventh switch and the twelfth switch to be turned on; Performing half-pack boost charging control on the first sub-battery pack through the first electric drive module and the second electric drive module, so as to boost the power output by the DC charge and discharge module and transmit it to the first sub-battery pack; Alternatively, the first sub-battery pack is subjected to half-pack voltage reduction and discharge control through the first electric drive module and the second electric drive module, so as to reduce the voltage of the power output by the first sub-battery pack and transmit it to the DC charging and discharging module.

16. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the first sub-battery pack is damaged, controlling the fourth switch, the sixth switch, the seventh switch, the ninth switch and the tenth switch to be turned on; Performing half-pack buck charging control on the second sub-battery pack through the first electric drive module and the second electric drive module, so as to buck the power output by the DC charge and discharge module and transmit it to the second sub-battery pack; Alternatively, the first electric drive module and the second electric drive module perform half-pack boost and discharge control on the second sub-battery pack, so as to boost the power output by the second sub-battery pack and transmit it to the DC charge and discharge module.

17. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the second sub-battery pack is damaged, controlling the third switch, the fifth switch, the eighth switch, the ninth switch and the tenth switch to be turned on; Performing half-battery pack step-down charging control on the first sub-battery pack through the first electric drive module and the second electric drive module, so as to step down the power output by the DC charge and discharge module and transmit it to the first sub-battery pack; Alternatively, the first electric drive module and the second electric drive module perform half-pack boost and discharge control on the first sub-battery pack, so as to boost the power output by the first sub-battery pack and transmit it to the DC charge and discharge module.

18. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the first sub-battery pack is damaged, controlling the second switch, the fourth switch, the ninth switch and the twelfth switch to be turned on; Performing half-pack direct charging control on the second sub-battery pack through the first electric drive module and the second electric drive module, so as to directly transmit the power output by the DC charging and discharging module to the second sub-battery pack; Alternatively, the first electric drive module and the second electric drive module perform half-pack direct discharge control on the second sub-battery pack, so as to directly transmit the power output by the second sub-battery pack to the DC charging and discharging module.

19. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the second sub-battery pack is damaged, controlling the first switch, the third switch, the ninth switch and the tenth switch to be turned on; The first sub-battery pack is controlled to be half-charged directly through the first electric drive module and the second electric drive module, so as to directly transmit the power output by the DC charge and discharge module to the first sub-battery pack; Alternatively, the first sub-battery pack is half-discharged by the first electric drive module and the second electric drive module, so that the power output by the first sub-battery pack is directly transmitted to the DC charging and discharging module.

20. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the first sub-battery pack is damaged, the fourth switch and the sixth switch are controlled to be turned on, and the first electric drive module performs half-pack boost control on the second sub-battery pack, and provides the half-pack boosted power to the second electric drive module; Alternatively, when the first sub-battery pack is damaged, the fourth switch and the seventh switch are controlled to be turned on, and the second sub-battery pack is half-boosted through the second electric drive module, and the half-boosted power is provided to the first electric drive module.

21. The control method of the power system according to claim 7, characterized in that: The control method of the power system comprises: When the second sub-battery pack is damaged, the third switch and the fifth switch are controlled to be turned on, and the first electric drive module performs half-pack boost control on the first sub-battery pack, and provides the half-pack boosted power to the second electric drive module; Alternatively, when the second sub-battery pack is damaged, the third switch and the eighth switch are controlled to be turned on, and the first sub-battery pack is half-boosted through the second electric drive module, and the half-boosted power is provided to the first electric drive module.

22. A vehicle, characterized in that: The vehicle comprises the power system according to any one of claims 1 to 6.

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