Battery control system and vehicle

Abstract

This disclosure relates to a battery control system and a vehicle. The battery control system includes: a power battery pack, comprising a first battery group and a second battery group connected in series; multiple electric drive circuits and charging / discharging ports corresponding to each electric drive circuit; a first terminal of each electric drive circuit is connected to the power battery pack, a second terminal of each electric drive circuit is connected between the first and second battery groups, and the second terminal of each electric drive circuit is connected to a charging / discharging port; any charging / discharging port, the power battery pack, and the multiple electric drive circuits can form a high-power boost charging circuit with a single charging gun. In the battery control system of this disclosure, the electrical energy input to any charging / discharging port can be alternately boosted and charged to the power battery pack by the multiple electric drive circuits in the high-power boost charging circuit, thereby achieving greater charging and discharging power and meeting the user's high-power charging needs.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle control technology, and more specifically, to a battery control system and a vehicle. Background Technology

[0002] With the development and rapid popularization of electric vehicles, lithium-ion batteries have been widely used due to their reliance on power batteries for power supply. Charging and discharging power batteries at suitable temperatures can improve their charging and discharging efficiency and extend their lifespan. There are various charging methods for power batteries, generally using DC charging, while some vehicles require AC charging.

[0003] In related technologies, existing charging piles have a fixed charging power, resulting in a long charging time, which does not meet users' needs for high-power fast charging. Summary of the Invention

[0004] The purpose of this disclosure is to provide a battery control system and vehicle to solve the problems existing in the related art.

[0005] To achieve the above objectives, a first aspect of this disclosure provides a battery control system, comprising:

[0006] A power battery pack, the power battery pack comprising a first battery pack and a second battery pack connected in series;

[0007] Multiple electric drive circuits and a charging / discharging port corresponding to each of the electric drive circuits;

[0008] The first end of each electric drive circuit is connected to the power battery pack, the second end of each electric drive circuit is connected between the first battery pack and the second battery pack, and the second end of each electric drive circuit is connected to the charging and discharging port.

[0009] Any of the charging / discharging ports, the power battery pack, and the multiple electric drive circuits can form a high-power boost charging circuit with a single charging gun.

[0010] Optionally, each of the electric drive circuits includes:

[0011] An inverter, wherein the first bus terminal of the inverter is connected to the positive terminal of the first battery pack, and the second bus terminal of the inverter is connected between the negative terminal of the second battery pack and the negative terminal of the charging / discharging port;

[0012] The motor has a winding that includes multiple pole pairs. Each pole pair includes three coil branches. The first ends of the coil branches of the same phase in the three coil branches of the multiple pole pairs are connected together and are connected one-to-one with the midpoint of the bridge arm of the inverter. The second ends of the three coil branches of each pole pair are connected together to form a pole.

[0013] In this configuration, some or all of the poles of the motor windings are connected together and led out, the first N line is connected to the positive terminal of the charging / discharging port, and the first N line is connected between the first battery pack and the second battery pack.

[0014] Alternatively, some poles of the multiple windings are connected together and a second N line is led out, the second N line is connected to the positive terminal of the charging / discharging port, and another portion of the poles of the multiple windings are connected together and a third N line is led out, the third N line is connected between the first battery pack and the second battery pack.

[0015] Optionally, the battery control system further includes:

[0016] inductance;

[0017] The first bus terminals of the inverters in the two electric drive circuits are connected via the inductor.

[0018] Optionally, any of the electric drive circuits and the power battery pack can form a self-heating circuit, and the battery control system further includes:

[0019] A charge / discharge on / off switch unit, wherein the charge / discharge on / off switch unit is configured to: enable or disable the high-power boost charging circuit;

[0020] The self-heating on / off switch unit is configured to enable or disable the self-heating circuit.

[0021] Optionally, the battery control system further includes:

[0022] The controller is connected to the inverter, the charge / discharge on / off switch unit, and the self-heating on / off switch unit in each of the electric drive circuits.

[0023] The controller is configured to control the inverter, the charge / discharge on / off switch unit, and the self-heating on / off switch unit in each of the electric drive circuits, so that at least one of the charge / discharge function, the self-heating function, and the drive function is realized.

[0024] Optionally, the plurality of electric drive circuits include a first electric drive circuit and a second electric drive circuit, and the charging and discharging port includes a first charging and discharging port corresponding to the first electric drive circuit and a second charging and discharging port corresponding to the second electric drive circuit.

[0025] The power battery pack and the first electric drive circuit can form a first self-heating circuit, and the power battery pack and the second electric drive circuit can form a second self-heating circuit; the self-heating on / off switch unit includes a first self-heating on / off switch unit and a second self-heating on / off switch unit; the first self-heating on / off switch unit is configured to make the first self-heating circuit conduct or disconnect; the second self-heating on / off switch unit is configured to make the second self-heating circuit conduct or disconnect.

[0026] Optionally, the controller is configured to:

[0027] When in the first state, the inverter in the first electric drive circuit, the inverter in the second electric drive circuit, and the charge / discharge on / off switch unit are controlled so that the electrical energy input from the first charge / discharge port or the second charge / discharge port is alternately charged to the power battery pack through the first electric drive circuit and the second electric drive circuit.

[0028] Optionally, the controller is configured to:

[0029] When in the second state, the inverter in the first electric drive circuit, the inverter in the second electric drive circuit, and the self-heating on / off switch unit are controlled so that the first battery pack and the second battery pack are alternately charged and discharged to heat the power battery pack.

[0030] Optionally, the controller is configured to:

[0031] When in the third state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the first charge / discharge port to power the first load; and the inverter in the second electric drive circuit and the second self-heating on / off switch unit are controlled so that the first battery pack and the second battery pack are charged and discharged alternately to heat the power battery pack.

[0032] Optionally, the controller is configured to:

[0033] When in the fourth state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter in the second electric drive circuit and the second self-heating on / off switch unit are controlled so that the first battery pack and the second battery pack are charged and discharged alternately to heat the power battery pack.

[0034] Optionally, the controller is configured to:

[0035] When in the fifth state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the first charge / discharge port to power the first load; and the inverter in the second electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the second charge / discharge port to power the second load.

[0036] Optionally, the controller is configured to:

[0037] When in the sixth state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter in the second electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the second charge / discharge port is output to the power battery pack to charge the power battery pack.

[0038] Optionally, the controller is configured to:

[0039] When in the seventh state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter in the second electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the second charge / discharge port to supply power to the second load.

[0040] Optionally, the controller is configured to:

[0041] By controlling the inverter in the first electric drive circuit, the electrical energy of the power battery pack is output to the motor in the first electric drive circuit to drive the vehicle, and / or, by controlling the inverter in the second electric drive circuit, the electrical energy of the power battery pack is output to the motor in the second electric drive circuit to drive the vehicle.

[0042] Optionally, the controller is configured to:

[0043] The phases of the inverter arm group controlling the first electric drive circuit and the inverter arm group controlling the second electric drive circuit are the same, and the phases of any two phase arms in the inverter arm group controlling the first electric drive circuit are staggered, and the phases of any two phase arms in the inverter arm group controlling the second electric drive circuit are staggered.

[0044] Optionally, the controller is configured to:

[0045] The phases of the inverter arm groups of the first electric drive circuit and the inverter arm groups of the second electric drive circuit are staggered, and the phases of all arms in the inverter arm group of the first electric drive circuit are the same, and the phases of all arms in the inverter arm group of the second electric drive circuit are the same.

[0046] Optionally, the controller is configured to:

[0047] The phases of the inverter arm groups of the first electric drive circuit and the inverter arm groups of the second electric drive circuit are staggered, and the phases of any two phase arms in the inverter arm group of the first electric drive circuit are staggered, and the phases of any two phase arms in the inverter arm group of the second electric drive circuit are staggered; or,

[0048] The phases of the bridge arm groups of the inverter in the first electric drive circuit and the bridge arm groups of the inverter in the second electric drive circuit are the same, and the phases of all bridge arms in the bridge arm groups of the inverter in the first electric drive circuit are the same, and the phases of all bridge arms in the bridge arm groups of the inverter in the second electric drive circuit are the same.

[0049] A second aspect of this disclosure provides a vehicle including the battery control system described in the first aspect.

[0050] The battery control system disclosed herein features multiple electric drive circuits and corresponding charging / discharging ports. Each charging / discharging port, the power battery pack, and the multiple electric drive circuits can form a high-power boost charging circuit with a single charging gun. The electrical energy input through any charging / discharging port is stored in the electric drive circuit and then released as a larger charging current to the power battery pack. The electrical energy input through any charging / discharging port can be alternately boosted and charged by the multiple electric drive circuits in the high-power boost charging circuit, thereby achieving greater charging and discharging power and meeting the user's high-power charging needs.

[0051] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0052] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0053] Figure 1 This is a circuit diagram illustrating a battery control system according to an exemplary embodiment.

[0054] Figure 2 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0055] Figure 3 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0056] Figure 4 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0057] Figure 5 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0058] Figure 6 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0059] Figure 7 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0060] Figure 8 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0061] Figure 9 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0062] Figure 10 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0063] Figure 11 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0064] Figure 12 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment.

[0065] Figure 13 This is a circuit diagram illustrating another battery control system according to an exemplary embodiment. Detailed Implementation

[0066] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0067] In related technologies, the charging function of power battery packs is limited. Even if boost charging can be achieved, the power output after boosting is still low, which cannot meet the demand for high-power boost charging. The applicable environment range is small, the system integration is low, and the efficiency of the power battery pack's charging and discharging system and the performance of the power battery pack cannot be maximized.

[0068] In order to solve the technical problems in the related art, this disclosure provides a battery control system and a vehicle including the battery control system.

[0069] Figure 1 This is a circuit diagram illustrating a battery control system according to an exemplary embodiment, such as... Figure 1 As shown, the battery control system includes:

[0070] The power battery pack includes a first battery pack E2 and a second battery pack E1 connected in series.

[0071] Multiple electric drive circuits and a charging / discharging port corresponding to each electric drive circuit;

[0072] The first end of each electric drive circuit is connected to the power battery pack, the second end of each electric drive circuit is connected between the first battery pack E2 and the second battery pack E1, and the second end of each electric drive circuit is connected to the charging and discharging port.

[0073] Any charging / discharging port, power battery pack, and multiple electric drive circuits can form a high-power boost charging circuit with a single charging gun.

[0074] For example, the power battery pack includes a second battery pack E1 connected in series and a second battery pack E2. Each battery pack may consist of multiple battery cells or battery nodes connected in series. The number of battery cells contained in the second battery pack E1 and the second battery pack E1 may be the same, and the number of battery cells contained in the power battery pack may be an even number.

[0075] For example, the charging / discharging port is used to input or output electrical energy. For instance, the charging / discharging port can be connected to a discharge gun or other load to supply power to those loads. It can also be connected to a charging gun or other charging device to input electrical energy into the charging / discharging port to charge the power battery pack. Other charging devices may include wireless charging devices or photovoltaic charging devices. Each electric drive circuit is connected to one charging / discharging port, and the number of charging / discharging ports can be the same as the number of electric drive circuits. The electric drive circuit can store energy in the charging / discharging port through the motor inductance and then release the stored energy to charge the battery. The voltage during charging can be increased after passing through the electric drive circuit, while the current during discharging can be reduced, thereby satisfying the battery's boost charging / buck discharging function and high-power fast charging function. The number of electric drive circuits can be two, three, or more; this embodiment does not limit this.

[0076] For example, for each electric drive circuit, the first terminal of the electric drive circuit is connected to the power battery pack, and the second terminal of the electric drive circuit is connected between the first battery pack E2 and the second battery pack E1. The second terminal of each electric drive circuit is also connected to a corresponding charging / discharging port. The second terminals of multiple electric drive circuits can be connected in parallel, for example, as shown below. Figure 1 As shown, the second end of one of the electric drive circuits is connected to one end of the first switch. The second end of the first switch is connected to the second end of another electric drive circuit and then connected in series with the second switch. It is then connected between the first battery pack E2 and the second battery pack E1, so that the second end of each electric drive circuit is connected between the second battery pack E1 and the second battery pack E1.

[0077] For example, a charging / discharging port, a power battery pack, and an electric drive circuit can form a boost charging circuit with a single charging gun, while a charging / discharging port, a power battery pack, and two or more electric drive circuits can form a high-power boost charging circuit with a single charging gun.

[0078] The battery control system disclosed herein features multiple electric drive circuits and corresponding charging / discharging ports. Each charging / discharging port, the power battery pack, and the multiple electric drive circuits can form a high-power boost charging circuit with a single charging gun. The electrical energy input through any charging / discharging port is stored in the electric drive circuit and then released as a larger charging current to the power battery pack. The electrical energy input through any charging / discharging port can be alternately boosted and charged by the multiple electric drive circuits in the high-power boost charging circuit, thereby achieving greater charging and discharging power and meeting the user's high-power charging needs.

[0079] In some embodiments, each drive circuit includes:

[0080] The inverter has its first busbar connected to the positive terminal of the first battery pack, and its second busbar connected between the negative terminal of the second battery pack and the negative terminal of the charging / discharging port.

[0081] The motor windings include multiple pole pairs, each pole pair including three coil branches. The first ends of the coil branches of the same phase in the multiple pole pairs are connected together and are connected one-to-one with the midpoint of the bridge arm of the inverter. The second ends of the three coil branches of each pole pair are connected together to form a pole. Some or all of the poles of the motor windings are connected together and a first N line is led out. The first N line is connected to the positive terminal of the charging and discharging port, and the first N line is connected between the first battery pack and the second battery pack.

[0082] For example, the motor in this disclosure can be a three-phase motor or a six-phase motor, etc. Figure 1 The example shown in this disclosure uses a three-phase motor as an example.

[0083] For example, the inverter includes multiple parallel bridge arms, the first ends of which are connected together to form a first bus terminal, and the second ends of which are connected together to form a second bus terminal. The first bus terminal of the inverter is connected to the positive terminal of the first battery pack E2, the second bus terminal of the inverter is connected to the negative terminal of the second battery pack E1, and the second bus terminal is also connected to the negative terminal of the charging / discharging port.

[0084] For example, the inverter includes three bridge arms, where VT1, VD1, VT2, and VD2 form one bridge arm, VT3, VD3, VT4, and VD4 form another bridge arm, and VT5, VD5, VT6, and VD6 form another bridge arm (VT21, VD21, VT24, and VD24 form another bridge arm, VT22, VD22, VT25, and VD25 form another bridge arm, and VT23, VD23, VT26, and VD26 form another bridge arm). The motor windings include four pole pairs, and each pole pair includes three coil branches. The first ends of the coil branches of the same phase in the three coil branches of the four pole pairs are connected together to obtain the ABC (A'B'C') three-phase system, and the ABC three-phase system is connected one-to-one with the midpoint A1B1C1 of the inverter's bridge arms. The second ends of the three coil branches of the four poles are connected together to obtain poles n1, n2, n3 and n4 respectively. Some or all of the four poles, i.e., one or more, are connected together to lead out the first N line. The first N line is connected to the positive terminal of the charging and discharging port, and the first N line is connected between the second battery pack E1 and the second battery pack E1.

[0085] For example, such as Figure 1-2 As shown, poles n1, n2, n3, and n4 can be connected together to draw the first N-line; poles n1 and n2 can be connected together to draw the first N-line; and poles n2, n3, and n4 can be connected together to draw the first N-line.

[0086] In this embodiment, the first ends of multiple pairs of poles of the motor winding are connected one-to-one with the midpoint of the inverter bridge arm, and the second ends of multiple pairs of poles form a pole. Some or all of the poles of the motor winding are connected together and a first N line is led out and connected to the positive terminal of the charging and discharging port, so that the power battery pack, inverter, motor and charging and discharging port can form a boost charging circuit. The electrical energy input from the charging and discharging port is used to boost charge the power battery pack through the inverter and motor in sequence. The power battery pack's electrical energy can also be output to the charging and discharging port through this boost charging circuit to supply power to the load.

[0087] In addition, the first end of multiple pole pairs of the motor windings and the midpoint of the inverter bridge arm, and the second end of multiple pole pairs form a pole. Some or all of the poles of the motor windings are connected together and a first N line is led out to connect between the second battery pack E1 and the second battery pack E1, so that the power battery pack, inverter and motor can form a self-heating circuit, so that the battery pack in the power battery pack stores electrical energy in the motor through the inverter, and then the electrical energy in the motor is transferred to the battery pack through the inverter. In this way, the second battery pack E1 and the second battery pack E1 can charge and discharge each other to heat the power battery pack.

[0088] In other embodiments, such as Figure 3 As shown, each electric drive circuit includes:

[0089] An inverter, wherein the first bus terminal of the inverter is connected to the positive terminal of the first battery pack, and the second bus terminal of the inverter is connected between the negative terminal of the second battery pack and the negative terminal of the charging / discharging port;

[0090] The motor has windings comprising multiple pole pairs, each pole pair comprising three coil branches. The first ends of the coil branches of the same phase in the multiple pole pairs are connected together and are connected one-to-one with the midpoint of the bridge arm of the inverter. The second ends of the three coil branches of each pole pair are connected together to form a pole. Some poles of the multiple windings are connected together and a second N line is led out. The second N line is connected to the positive terminal of the charging / discharging port. Other poles of the multiple windings are connected together and a third N line is led out. The third N line is connected between the first battery pack and the second battery pack.

[0091] For example, such as Figure 3As shown, the inverter includes three bridge arms, and the motor windings include four pole pairs. Each pole pair includes three coil branches. The first ends of the coil branches of the same phase in the three coil branches of the four pole pairs are connected together to obtain three phases ABC. These three phases ABC are then connected one-to-one with the midpoints A1B1C1 of the inverter's bridge arms. The second ends of the three coil branches of the four pole pairs are connected together to obtain poles n1, n2, n3, and n4, respectively. A portion (not all) of the four poles is connected together to form a second N line, which is connected to the positive terminal of the charging / discharging port. Another portion of the four poles is connected together to form a third N line, which connects the second battery pack E1 to the second battery pack E1. It should be noted that the above-mentioned portion can constitute all or not constitute all; this embodiment does not limit this.

[0092] For example, please refer to Figure 3 Pole n1 and pole n2 can be connected together to draw a second N-line (N1 and N3 in the diagram), and pole n3 and pole n4 can be connected together to draw a third N-line (N2 and N4 in the diagram); alternatively, a second N-line can be drawn from pole n1, and poles n2, n3, and n4 can be connected together to draw a third N-line; alternatively, poles n1 and n2 can be connected together to draw a second N-line, and a third N-line can be drawn from pole n4.

[0093] Under the same electronic switching frequency and control method, the more poles connected to the neutral line N, the more parallel coil branches, the smaller the equivalent inductance of the motor, the larger the ripple of the self-heating current or boost charging current, and the greater the iron loss of the motor. This can easily lead to excessively high temperatures and demagnetization of the motor magnets. Figure 1 Taking the structure as an example, the three-phase coils of the motor form four poles. The inductance relationship is as follows: the inductance of neutral line N connected to one pole is greater than the inductance of neutral line N connected to two poles, which is greater than the inductance of neutral line N connected to three poles, which is greater than the inductance of neutral line N connected to four poles. The actual number of poles connected to the neutral line in the circuit is selected based on the required current for self-heating and the ripple current that the motor can withstand.

[0094] In some embodiments, the battery control system further includes:

[0095] inductance;

[0096] The first bus terminals of the inverters in the two electric drive circuits are connected via the inductor.

[0097] For example, the two electric drive circuits are a first electric drive circuit and a second electric drive circuit, respectively. The first bus terminal of the inverter of the first electric drive circuit is connected to the positive terminal of the first battery pack E2, and the first bus terminal of the inverter of the second electric drive circuit is connected to the positive terminal of the first battery pack E2. The first bus terminal of the inverter of the first electric drive circuit 31 and the first bus terminal of the inverter of the second electric drive circuit are connected through an inductor L.

[0098] The problem of bus current oscillation can be solved by connecting the two inverters of the two electric drive circuits with an inductor L.

[0099] In some embodiments, any electric drive circuit and the power battery pack can form a self-heating circuit, and the battery control system further includes:

[0100] The charge / discharge on / off switching unit is configured to either turn the high-power boost charging circuit on or off. When the boost charging circuit is on, the power battery pack can be boosted and charged through the high-power boost charging circuit, or the power battery pack can be de-energized and discharged through the high-power boost charging circuit to supply power to the load.

[0101] The self-heating on / off switch unit is configured to either turn the self-heating circuit on or off. When the self-heating circuit is on, the charging and discharging of the first battery pack E2 or the second battery pack E1 can be achieved through the self-heating circuit to heat the power battery pack.

[0102] In some embodiments, such as Figure 1 As shown, the battery control system also includes a switching assembly, which may include a charge / discharge on / off switch unit and a self-heating on / off switch unit. Specifically, the switching assembly may include a first switch, a second switch, a third switch, a fourth switch, and a fifth switch. The first switch is located on the connection line between the negative terminal of the second battery pack E1 and the second busbar; the second switch is located on the connection line between the positive terminal of the first battery pack E2 and the first busbar; the third switch is located on the connection line between the second terminal of the motor and the positive terminal of the charge / discharge port; the fourth switch is located on the connection line between the second busbar and the negative terminal of the charge / discharge port; and the fifth switch is located on the connection line between the second terminal of the motor and the first battery pack E2 and the second battery pack E1. Figure 1-3 As shown, the first switch can be K1, the second switch can be K2, the third switch can be K4 and K8, the fourth switch can be K3 and K7, and the fifth switch can include K6 and K9.

[0103] Among them, Figure 2In the structure shown, the charging on / off switch unit may include K1, K2, K3 and K4, and / or the charging on / off switch unit may include K1, K2, K7 and K8, the self-heating on / off switch unit may include K1, K2 and K6, and / or the self-heating on / off switch unit may include K1, K2, K6 and K9.

[0104] In some embodiments, the battery control system further includes:

[0105] The controller is connected to the inverter, charge / discharge on / off switch unit, and self-heating on / off switch unit in each electric drive circuit. The controller can be an MCU (Microcontroller Unit).

[0106] The controller is configured to control the inverter, charge / discharge on / off switching unit, and self-heating on / off switching unit in each electric drive circuit, enabling at least one of the following functions: charging / discharging, self-heating, and driving. Specifically, by controlling the inverter, charge / discharge on / off switching unit, and self-heating on / off switching unit, the controller can achieve coordination between charging and self-heating functions, charging and driving functions, charging and discharging functions, charging and charging functions, discharging and discharging functions, self-heating functions, discharging and self-heating functions, discharging and driving functions, and driving and self-heating functions.

[0107] In some embodiments, the plurality of electric drive circuits include a first electric drive circuit and a second electric drive circuit, and the charging / discharging port includes a first charging / discharging port corresponding to the first electric drive circuit and a second charging / discharging port corresponding to the second electric drive circuit. The power battery pack, the first electric drive circuit, and the first charging / discharging port can form a first boost charging circuit, and the power battery pack, the second electric drive circuit, and the second charging / discharging port can form a second boost charging circuit. The charging / discharging on / off switching unit includes a first charging / discharging on / off switching unit in the first boost charging circuit and a second charging / discharging on / off switching unit in the second boost charging circuit. The power battery pack and the first electric drive circuit can form a first self-heating circuit, and the power battery pack and the second electric drive circuit can form a second self-heating circuit. The self-heating on / off switching unit includes a first self-heating on / off switching unit and a second self-heating on / off switching unit; the first self-heating on / off switching unit is configured to turn the first self-heating circuit on or off; the second self-heating on / off switching unit is configured to turn the second self-heating circuit on or off. A first load is connected to the first charging / discharging port, and a second load is connected to the second charging / discharging port (not shown in the figure).

[0108] like Figure 1As shown, the first charge / discharge on / off switch unit may include K1, K2, K3, and K4, and the second charge / discharge on / off switch unit may include K1, K2, K7, and K8. The first self-heating on / off switch unit may include K1, K2, and K6, and the second self-heating on / off switch unit may include K1, K2, K6, and K9.

[0109] The inverter in the first electric drive circuit is the first inverter, the inverter in the second electric drive circuit is the second inverter, the motor in the first electric drive circuit is the first motor, and the motor in the second electric drive circuit is the second motor.

[0110] In some embodiments, the controller is configured to:

[0111] When in the first state, the inverter in the first electric drive circuit, the inverter in the second electric drive circuit, and the charge / discharge on / off switch unit are controlled so that the electrical energy input from the first charge / discharge port or the second charge / discharge port is alternately charged to the power battery pack through the first electric drive circuit and the second electric drive circuit.

[0112] For example, the controller can be configured to sequentially execute the first control phase and the second control phase to enable the electrical energy input through a single charging / discharging port to alternately charge the power battery pack via the first electric drive circuit and the second electric drive circuit, thereby achieving high-power boost charging with a single charging gun.

[0113] Please see Figure 4 The first control phase involves closing switches K1, K2, K3, K4, and K9, opening the remaining switches, and controlling the upper bridge arm of the first inverter to be on and the lower bridge arm to be off, as well as controlling the upper bridge arm of the second inverter to be off and the lower bridge arm to be on. During this first control phase, the electrical energy input from the first charging / discharging port is controlled to charge the power battery pack via the first motor and the upper bridge arm of the first inverter. Simultaneously, the electrical energy input from the first charging / discharging port passes through switch K9 via the second motor and the lower bridge arm of the second inverter to store energy in the inductance of the second motor's windings.

[0114] Please see Figure 5 The second control phase involves closing switches K1, K2, K3, K4, and K9, opening the remaining switches, and controlling the upper bridge arm of the first inverter to disconnect and the lower bridge arm to conduct, while controlling the upper bridge arm of the second inverter to conduct and the lower bridge arm to disconnect. During this second control phase, the electrical energy input from the first charging / discharging port passes through the first motor and the lower bridge arm of the first inverter to store energy in the inductance of the first motor's windings. The electrical energy input from the first charging / discharging port then passes through switch K9, the second motor, the upper bridge arm of the second inverter, and inductor L to charge the power battery pack.

[0115] It is understandable that in the first and second control stages described above, if the second charging / discharging port is used to charge and discharge the power battery pack, the first control stage can be to close K1, K2, K7, K8, and K9, open the remaining switches, and control the upper bridge arm of the first inverter to disconnect and the lower bridge arm to conduct, and the upper bridge arm of the second inverter to conduct and the lower bridge arm to disconnect. The second control stage can be to close K1, K2, K7, K8, and K9, open the remaining switches, and control the upper bridge arm of the first inverter to conduct and the lower bridge arm to disconnect, and the upper bridge arm of the second inverter to disconnect and the lower bridge arm to conduct. The control principle is the same as described above. Figure 4 and Figure 5 The control principle described in the previous article is the same, so it will not be repeated here.

[0116] The high-power boost charging circuit with a single charging gun disclosed herein can release a larger charging current to the power battery pack after the electrical energy input through any charging or discharging port is stored in the electric drive circuit. The electrical energy input through any charging or discharging port can be alternately boosted and charged to the power battery pack by multiple electric drive circuits in the high-power boost charging circuit, thereby achieving a larger charging and discharging power and meeting the user's high-power charging needs.

[0117] In some embodiments, the controller is configured to:

[0118] When in the second state, the inverter in the first electric drive circuit, the inverter in the second electric drive circuit, and the self-heating on / off switch unit are controlled to cause the first battery pack and the second battery pack to charge and discharge alternately to heat the power battery pack.

[0119] For example, the controller can be configured to sequentially execute the third, fourth, fifth, and sixth control stages to achieve the synergy between the self-heating function and the self-heating function.

[0120] Please see Figure 6 The third control phase involves closing switches K1, K2, K6, and K9 while opening the remaining switches. It also controls the upper bridge arm of the first inverter to disconnect and the lower bridge arm to connect, and controls the upper bridge arm of the second inverter to connect and the lower bridge arm to disconnect. The third control phase also controls the second battery pack E1 to discharge to charge the first motor, and the second motor to discharge to charge the first battery pack E2.

[0121] Please see Figure 7 The fourth control phase involves closing switches K1, K2, K6, and K9 while opening the remaining switches. It also involves connecting the upper bridge arm and disconnecting the lower bridge arm in the first inverter, and disconnecting the upper bridge arm and connecting the lower bridge arm in the second inverter. During this fourth control phase, the second battery pack E1 discharges to charge the second motor, and the first motor discharges to charge the second battery pack E1.

[0122] Please see Figure 8 The fifth control stage involves closing switches K1, K2, K6, and K9 while opening the remaining switches. It also controls the upper bridge arm of the first inverter to connect and the lower bridge arm to disconnect, and controls the upper bridge arm of the second inverter to disconnect and the lower bridge arm to connect. During this fifth control stage, the first battery pack E2 discharges to charge the first motor, and the second motor discharges to charge the second battery pack E1.

[0123] Please see Figure 9 The sixth control stage involves closing switches K1, K2, K6, and K9 while opening the remaining switches. It also involves disconnecting the upper bridge arm of the first inverter and connecting the lower bridge arm, and connecting the upper bridge arm of the second inverter and disconnecting the lower bridge arm. During this sixth control stage, the first battery pack E2 discharges to charge the second motor, and the first motor discharges to charge the second battery pack E1.

[0124] In some embodiments, the controller is configured to:

[0125] When in the third state, the inverter and charge / discharge on / off switch unit in the first electric drive circuit are controlled so that the electrical energy output from the power battery pack is output to the first charge / discharge port to power the first load; and the inverter and the second self-heating on / off switch unit in the second electric drive circuit are controlled so that the first battery pack and the second battery pack are charged and discharged alternately to heat the power battery pack.

[0126] For example, the controller can be configured to sequentially execute the seventh, eighth, ninth, and tenth control stages to achieve the synergy between the self-heating function and the self-heating function.

[0127] The seventh control stage involves closing switches K1, K2, K3, K4, and K9, opening the remaining switches, disconnecting the upper bridge arm of the first inverter, connecting the lower bridge arm, and connecting the upper bridge arm of the second inverter while disconnecting the lower bridge arm. During this seventh control stage, the first motor discharges and supplies power to the first load through the first charging / discharging port, while the second motor discharges to charge the first battery pack E2.

[0128] The eighth control phase involves closing switches K1, K2, K3, K4, and K9, opening the remaining switches, and controlling the upper bridge arm of the first inverter to conduct while the lower bridge arm is disconnected. It also controls the upper bridge arm of the second inverter to disconnect while the lower bridge arm is conducted. During this eighth control phase, the first battery pack E2 and the second battery pack E1 discharge, supplying power to the first load through the first charging / discharging port. The second battery pack E1 discharges to charge the second motor.

[0129] The ninth control stage involves closing switches K1, K2, K3, K4, and K9, opening the remaining switches, disconnecting the upper bridge arm of the first inverter, and turning on the lower bridge arm. It also involves turning on the upper bridge arm of the second inverter and disconnecting the lower bridge arm. During this ninth control stage, the first motor discharges and supplies power to the first load through the first charging / discharging port, while the first battery pack E2 discharges to charge the second motor.

[0130] The tenth control stage involves closing switches K1, K2, K3, K4, and K9, opening the remaining switches, and controlling the upper bridge arm of the first inverter to conduct while the lower bridge arm is disconnected. It also controls the upper bridge arm of the second inverter to disconnect while the lower bridge arm is conducted. During this tenth control stage, the first battery pack E2 and the second battery pack E1 discharge and supply power to the first load through the first charging / discharging port. The second motor discharges to charge the second battery pack E1.

[0131] In some embodiments, the controller is configured to:

[0132] When in the fourth state, the inverter and charge / discharge on / off switch unit in the first electric drive circuit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter and the second self-heating on / off switch unit in the second electric drive circuit are controlled so that the first battery pack and the second battery pack are charged and discharged alternately to heat the power battery pack.

[0133] For example, the controller can be configured to sequentially execute the eleventh, twelfth, thirteenth, and fourteenth control stages to achieve synergy between the charging and self-heating functions.

[0134] Please see Figure 10 The eleventh control stage involves closing switches K1, K2, K3, K4, and K6, opening the remaining switches, disconnecting the upper bridge arm of the first inverter, connecting the lower bridge arm, and connecting the upper bridge arm of the second inverter while disconnecting the lower bridge arm. The eleventh control stage also involves discharging from the first charging / discharging port to charge the first motor, and charging / discharging the second motor to charge the first battery pack E2.

[0135] Please see Figure 11 The twelfth control stage involves closing switches K1, K2, K3, K4, and K6, opening the remaining switches, and controlling the upper bridge arm of the first inverter to conduct while the lower bridge arm is disconnected. It also controls the upper bridge arm of the second inverter to disconnect while the lower bridge arm is conducted. During this twelfth control stage, the first charging / discharging port discharges and boosts the voltage through the first motor to charge the second battery pack E1 and the second battery pack E2. The second battery pack E1 then discharges to charge the second motor.

[0136] Please see Figure 12The thirteenth control stage involves closing switches K1, K2, K3, K4, and K6, opening the remaining switches, disconnecting the upper bridge arm of the first inverter, and turning on the lower bridge arm. It also involves turning on the upper bridge arm of the second inverter and disconnecting the lower bridge arm. The thirteenth control stage also involves discharging from the first charging / discharging port to charge the first motor, and discharging from the first battery pack E2 to charge the second motor.

[0137] Please see Figure 13 The fourteenth control phase involves closing switches K1, K2, K3, K4, and K6, opening the remaining switches, and controlling the upper bridge arm of the first inverter to conduct while the lower bridge arm is disconnected. It also controls the upper bridge arm of the second inverter to disconnect while the lower bridge arm is conducted. During the fourteenth control phase, the first charging / discharging port discharges and the voltage is boosted by the first motor to charge the second battery pack E1 and the second battery pack E2. The second motor discharges to charge the second battery pack E1.

[0138] In some embodiments, the controller is configured to:

[0139] When in the fifth state, the inverter and charge / discharge switch unit in the first electric drive circuit are controlled so that the electrical energy output by the power battery pack is output to the first charge / discharge port to power the first load; and the inverter and charge / discharge switch unit in the second electric drive circuit are controlled so that the electrical energy output by the power battery pack is output to the second charge / discharge port to power the second load.

[0140] For example, the controller may operate by alternately executing the fifteenth and sixteenth control stages to achieve the coordination of the discharge function and the discharge function.

[0141] The fifteenth control phase involves closing switches K1, K2, K3, K4, K7, and K8, opening the remaining switches, disconnecting the upper bridge arm of the first inverter, and turning on the lower bridge arm. It also involves turning on the upper bridge arm of the second inverter and disconnecting the lower bridge arm. During this phase, the first motor discharges and supplies power to the first load through the first charging / discharging port, while the power battery pack discharges and supplies power to the second load through the second motor and the second charging / discharging port. During this process, the second motor stores energy.

[0142] The sixteenth control phase involves closing switches K1, K2, K3, K4, K7, and K8, opening the remaining switches, and controlling the upper bridge arm of the first inverter to conduct while the lower bridge arm is disconnected. Similarly, it controls the upper bridge arm of the second inverter to disconnect while the lower bridge arm is conducted. During this sixteenth control phase, the second motor discharges and supplies power to the second load through the second charging / discharging port. The power battery pack discharges and supplies power to the first load through the first motor and the first charging / discharging port. During this process, the first motor stores energy.

[0143] In some embodiments, the controller is configured to:

[0144] When in the sixth state, the inverter and charge / discharge on / off switch unit in the first electric drive circuit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter and charge / discharge on / off switch unit in the second electric drive circuit are controlled so that the electrical energy input through the second charge / discharge port is output to the power battery pack to charge the power battery pack.

[0145] For example, the controller can be configured to alternately execute the seventeenth and eighteenth control stages to achieve the synergy of the charging function and the charging function, i.e., high-power charging with dual charging guns.

[0146] The seventeenth control phase involves closing switches K1, K2, K3, K4, K7, and K8, opening the remaining switches, disconnecting the upper bridge arm of the first inverter, and turning on the lower bridge arm. It also controls the upper bridge arm of the second inverter to turn on and the lower bridge arm to disconnect. During this phase, the first charging / discharging port discharges to charge the first motor, and the second charging / discharging port discharges and boosts the voltage through the second motor to charge the power battery pack. In this process, the second motor stores energy.

[0147] The eighteenth control phase involves closing switches K1, K2, K3, K4, K7, and K8, opening the remaining switches, and controlling the upper bridge arm of the first inverter to conduct while the lower bridge arm is disconnected. It also controls the upper bridge arm of the second inverter to disconnect while the lower bridge arm is conducted. During this phase, the second charging / discharging port discharges to charge the second motor, and the first charging / discharging port discharges and boosts the voltage through the first motor to charge the power battery pack. In this process, the first motor stores energy.

[0148] In some embodiments, the controller is configured to:

[0149] When in the seventh state, the inverter and charge / discharge on / off switch unit in the first electric drive circuit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter and charge / discharge on / off switch unit in the second electric drive circuit are controlled so that the electrical energy output from the power battery pack is output to the second charge / discharge port to supply power to the second load.

[0150] For example, the controller may operate by alternately executing the nineteenth and twentieth control stages to achieve coordination between the charging and discharging functions.

[0151] The nineteenth control phase involves closing switches K1, K2, K3, K4, K7, and K8, opening the remaining switches, and disconnecting the upper bridge arm and connecting the lower bridge arm in the first inverter. It also connects the upper bridge arm and disconnects the lower bridge arm in the second inverter. During this phase, the first motor discharges and supplies power to the first load through the first charging / discharging port, while the second charging / discharging port discharges and boosts the voltage of the power battery pack through the second motor. In this charging process, the second motor stores energy.

[0152] The twentieth control phase involves closing switches K1, K2, K3, K4, K7, and K8, opening the remaining switches, and controlling the upper bridge arm of the first inverter to conduct while the lower bridge arm is disconnected. Similarly, it controls the upper bridge arm of the second inverter to disconnect while the lower bridge arm is conducted. During this twentieth control phase, the second motor discharges and supplies power to the second load through the second charging / discharging port. The first charging / discharging port discharges and boosts the voltage through the first motor to power the battery pack. In this process, the first motor stores energy.

[0153] In some embodiments, the controller is configured to:

[0154] By controlling the inverter in the first electric drive circuit, the electrical energy of the power battery pack is output to the motor in the first electric drive circuit to drive the vehicle, and / or, by controlling the inverter in the second electric drive circuit, the electrical energy of the power battery pack is output to the motor in the second electric drive circuit to drive the vehicle.

[0155] The driving function can be combined with any of the above states, or it can replace the self-heating function or charging function in the above states.

[0156] To reduce ripple, asynchronous control can be implemented for the bridge arm groups within the inverter and / or between inverters. The inverter in the first electric drive circuit is the first inverter, and the inverter in the second electric drive circuit is the second inverter.

[0157] In some embodiments, the controller is configured to:

[0158] The phases of the inverter arm groups controlling the first and second electric drive circuits are the same, and the phases of any two phase arms in the inverter arm group controlling the first electric drive circuit are staggered, as are the phases of any two phase arms in the inverter arm group controlling the second electric drive circuit. This achieves synchronous control between the first and second inverter arm groups, and asynchronous control within each arm group. Synchronous control means that the controlled objects have the same phase, while asynchronous control means that the controlled objects have staggered phases.

[0159] In some embodiments, the controller is configured to:

[0160] The phases of the bridge arm groups controlling the inverters of the first and second electric drive circuits are staggered. All bridge arms in the bridge arm group controlling the first electric drive circuit have the same phase, and all bridge arms in the bridge arm group controlling the second electric drive circuit have the same phase. This achieves asynchronous control between the bridge arm groups of the first and second inverters, while synchronous control is performed within each bridge arm group.

[0161] In some embodiments, the controller is configured to:

[0162] The phases of the bridge arm groups controlling the inverters of the first and second electric drive circuits are staggered. Furthermore, the phases of any two phase bridge arms in the bridge arm group controlling the first electric drive circuit are staggered, and the phases of any two phase bridge arms in the bridge arm group controlling the second electric drive circuit are also staggered. This achieves asynchronous control between the bridge arm groups of the first and second inverters, and asynchronous control within each bridge arm group; or...

[0163] The phases of the bridge arm groups of the inverter in the first electric drive circuit and the bridge arm groups of the inverter in the second electric drive circuit are the same, and the phases of all bridge arms in the bridge arm groups of the inverter in the first electric drive circuit are the same, and the phases of all bridge arms in the bridge arm groups of the inverter in the second electric drive circuit are the same.

[0164] For example, each phase of the A1B1C1 winding can be staggered by a certain phase the1, and each phase of the A2B2C2 winding can also be staggered by a certain phase the2, so that each motor of the ABC winding and the A2B2C2 winding is uniformly staggered by a certain angle the3 (the1, the2, the3∈(0,360)).

[0165] Based on different motor design schemes and operating modes, the optimal operating mode is selected. For example, for a six-phase motor, self-heating functions, boost charging self-heating, or DC direct-connect charging self-heating can be implemented in parking, charging, and driving conditions. For two systems operating simultaneously, the first motor preferably uses the1=120° phase-shift control, the second motor uses the2=120° phase-shift control, and the second motor is staggered from the first motor by the3=60°. If the first motor winding is phase P1 and the second motor winding is phase P2, then the optimal values ​​are the1=360 / P1 degrees, the2=360 / P2 degrees, and the3=360 / (P1+P2) degrees. This ensures that during self-heating or charging, the equivalent inductance L on the N line is large, the ripple voltage and ripple current at the boost charging / discharging port are minimized, the ripple current on the N line for self-heating is minimized, and the ripple current of the bus capacitor is minimized, reducing the pressure on bus capacitor selection, reducing the peak-to-peak value of the self-heating current ripple, and reducing external EMC interference.

[0166] For example, when the vehicle is not self-heating during operation, and two electric drive circuits are working simultaneously, it is preferable to use a scheme in which the first electric drive circuit is controlled with the1=0° and the second electric drive circuit is controlled with the2=0°, and the second electric drive circuit and the first electric drive circuit are staggered by the3=180°. This can achieve the effect of smaller torque pulsation of the motor, smaller ripple current of the bus capacitor, and reduced pressure on the selection of bus capacitors.

[0167] In one possible implementation, the controller can control the first inverter, the second inverter, the charging on / off switch unit, and the self-heating on / off switch unit via control commands, so that at least one of the charging / discharging function, the self-heating function, and the driving function can be realized.

[0168] The control commands can include switch control commands and bridge arm control commands. Switch control commands control the charging on / off switching unit and the self-heating on / off switching unit. Bridge arm control commands control the on / off state of the bridge arm groups in the first inverter and the second inverter. The bridge arm control commands can include the duty cycle of each phase bridge arm. Whether it's self-heating, boost charging, or buck discharging, the corresponding function is achieved through common-mode voltage control. The drive function is controlled by the differential-mode voltage of the bridge arm. The common-mode voltage and differential-mode voltage are added together to obtain the control voltage for each phase bridge arm. By modulating the duty cycle of the bridge arm output, each function can be independently controlled to achieve its corresponding function.

[0169] by Figure 1 Using a circuit topology diagram as an example, this paper provides a system solution for achieving high-power charging and high-power self-heating functions. Based on one electric drive circuit system, it explains how to achieve boost charging, parking self-heating, and driving self-heating technologies. The other electric drive circuit system uses the same technical means to achieve the same functions. The two systems can operate independently or simultaneously, and can achieve battery self-heating functions in boost charging, driving, and parking conditions. The functions implemented by each system are distributed through a controller.

[0170] Specifically, the first electric drive circuit system comprises the first boost charging circuit and the first self-heating circuit. The second electric drive circuit system is implemented in the same way as the first electric drive circuit system.

[0171] Control process: The first electric drive circuit system receives charging and discharging commands and self-heating power commands, including self-heating current amplitude commands, self-heating current frequency commands, and self-heating battery equalization current commands. The command calculation module calculates the commands and assigns them to the corresponding control target variables, thereby controlling the target variables and realizing the corresponding functions.

[0172] by Figure 1For example, specifically:

[0173] ① Battery self-heating function:

[0174] 1. The first motor drive system obtains the control target in the dq coordinate system: given the self-heating current amplitude ipkx, current frequency fx, and self-heating battery active balancing current indcx, the current on line Nx is obtained as inx*=indcx+ipkx*sin(2pi*fx*t) or inx*=indcx+ipkx*cos(2pi*fx*t); the required current value inx* and the actual inx current value (in1=-ia1-ib1-ic1) are used to obtain the required duty cycle Dnx through PI or PR closed-loop control, and the common mode duty cycle of the upper bridge arm is Dpx=1-Dnx. In Dpx, p refers to the number of motor phases in each motor's dq coordinate system, x refers to the x-th motor, x=1 refers to the first motor's dq coordinate system, x=2 refers to the second motor's dq coordinate system, and so on. Figure 2 Two three-phase motors, each motor with three-phase windings, each system with p=1, 2, 3, where the common-mode duty cycle of phase A1 is D11, phase B1 is D21, phase C1 is D31, phase A2 is D12, phase B2 is D22, and phase C2 is D32.

[0175] ② Battery charging function

[0176] 2. Charge / discharge command: The charge / discharge command determines whether to perform direct charging or boost charging based on the voltage level of the charging pile and the power battery pack.

[0177] 1) Direct charging: When the charging pile is connected to the first charging / discharging port, and the voltage of the charging pile is higher than the voltage of the power battery pack, direct charging / discharging is selected, that is, K1, K2, K3, and K5 are engaged, and the bridge arms corresponding to the three-phase windings A1, B1, and C1 are not controlled. When the charging pile is connected to the second charging / discharging port, and the voltage of the charging pile is higher than the voltage of the power battery pack, K1, K2, K7, and K8 are engaged, and the bridge arms corresponding to the three-phase windings A2, B2, and C2 are not controlled.

[0178] 2) Battery boost charging function: When the voltage of the charging pile at the first charging / discharging port is lower than the voltage of the battery pack, boost charging / discharging is selected, activating K1, K2, K3, and K4. The first motor dq coordinate system is used for boost charging. When the voltage of the charging pile at the second charging / discharging port is lower than the voltage of the power battery pack, boost charging / discharging is selected, activating K1, K2, K6, and K7. The second motor dq coordinate system is used for boost charging.

[0179] The electric drive circuit system can also employ single-voltage closed-loop control: In the voltage closed-loop stage, the required charging port voltage command Unx is obtained from the command calculation module. The required voltage value Unx and the actual Unx (Un1 is obtained through the voltage across sampling capacitor C12, and Un2 is obtained through the voltage across sampling capacitor C22) are used to derive the required control voltage Unx (common-mode voltage value) through closed-loop control. The control voltage value of each phase bridge arm is equal to the common-mode voltage Unx. By modulating the control voltage value of each phase bridge arm with the bus voltage and the carrier wave, the PWM common-mode duty cycle Dpx of each phase bridge arm in the x-th dq coordinate system is obtained. Through the modulation effect of the bridge arm, the required motor phase current value is obtained. x refers to the x-th motor, x=1 refers to the first motor dq coordinate system, and x=2 refers to the second motor dq coordinate system.

[0180] The actual current on line N1 is calculated using in1 = -ia1 - ib1 - ic1, and the actual current on line N2 is calculated using in2 = -ia2 - ib2 - ic2. These calculations are used for current monitoring and protection.

[0181] ③ Torque control:

[0182] The first motor's dq coordinate system obtains the target torque for control. Based on the target torque command, motor speed, and battery bus voltage, the target idx and iqx that satisfy the torque command are found through the MTPA & MTPV curves (the MTPA & MTPV curves can be pre-calculated and bench-calibrated; generally, the target current commands idx and iqx are obtained from voltage, torque, and speed using a lookup table or linear fitting method). After the calculation process, the target idx and iqx are obtained. Closed-loop control of the current vector on the dq axis is performed according to the motor's vector control method. The sampled px phase current values ​​i1x, i2x, ..., ipx are transformed to the αβ coordinate system iαx and iβx through Clark coordinate transformation, and then transformed to the dq coordinate system through Park coordinate transformation to obtain the direct-axis current idx and quadrature-axis current iqx. The difference between the current given target value idx* and idx is used to output the target value Udx through PID control. The difference between the current given target value iqx* and iqx is used to output the target value Uqx through PID control. Udx and Uqx are transformed by inverse Park to obtain Uαx and Uβx. Uαx and Uβx are transformed by inverse Clark to obtain U1x, U2x, ..., Upx. The control voltage values ​​of each phase arm are modulated with the bus voltage and carrier wave to obtain the PWM differential duty cycle DD1x, DD2x, ..., DDpx of each phase arm in phase px. Here, p refers to the number of motor phases in each motor dq coordinate system, x refers to the x-th motor, x=1 refers to the 1st motor dq coordinate system, x=2 refers to the 2nd motor dq coordinate system, and so on. Figure 2 Two three-phase motors, each with three-phase windings. Here, the p=1, 2, 3 of each system are: A1 phase differential duty cycle DD11, B1 phase differential duty cycle DD21, C1 phase differential duty cycle DD31, A2 phase differential duty cycle DD12, B2 phase differential duty cycle DD22, and C2 phase differential duty cycle DD32.

[0183] ④ Circulation heating function

[0184] Whether it's circulating current heating under parking conditions, circulating current heating when drawing power from a charging pile, circulating current heating under parking conditions with DC direct charging, circulating current heating under parking conditions, or circulating current heating under driving conditions, switch K9 needs to be closed, and the current relationship on the motor's N line is iN1 = -iN2. Under parking conditions, circulating current heating is achieved during single-gun high-power boost charging, and iN1 + iN2 + charging current = 0.

[0185] During the circulating heating process, the current iN1 on the motor's N-line is controlled to be a sine wave, square wave, trapezoidal wave, or DC, allowing the motor to draw power from the battery pack or charging station. Current flows through the motor windings, generating heat in the electric drive system, which can then heat the passenger compartment or the battery via a heat exchanger. This solves the battery charging problem in extreme low-temperature environments: Batteries in extreme low temperatures cannot be charged or discharged, cannot self-heat, or have almost zero charge and cannot self-heat. Power can be drawn from the charging station, and the electric drive system consumes power to generate heat to heat the battery. Once the battery temperature rises to a certain level, charging and battery self-heating are activated, and the circulating heating function is deactivated.

[0186] The control process for circulating current heating involves determining the target value of the circulating current on motor N1 line: inc1* = indcc2 + ipkc2*sin(2pi*f2*t) or inc1* = indcc2 + ipkc2*cos(2pi*f2*t). The actual current on motor N1 line is inc1 (inc1 = -ia1 - ib1 - ic1). The target current value inc1* and the actual current value inc1 are used in a PI or PR closed-loop control system to obtain the common-mode duty cycle Dnc1 of the lower bridge arm A1B1C1 and the common-mode duty cycle Dpc2 of the upper bridge arm A2B2C2. The common-mode duty cycle of the upper bridge arm A1B1C1 is Dpc1 = 1 - Dnc1, and Dpc2 = Dnc1. Controlling the current amplitude on motor N1 line controls the heating power.

[0187] The current flowing through the N1 line has a basically consistent current amplitude in each phase winding of the two three-phase motors, resulting in consistent heating power in each phase winding. This balanced heating of the electric drive system allows for the output of greater heating power. Figure 1 Taking two three-phase motors as an example, the power of the circulating heating is shown in the following formula:

[0188]

[0189] Where m1 represents the number of phases of winding A1B1C1, m2 represents the number of phases of winding A2B2C2, and R sn1 R represents the resistance value from the N1 line of the motor to the terminals of the motor phase windings A1B1C1. sn2 This represents the resistance value from the N2 line of the motor to the terminals of the motor phase windings A2B2C2, where m1=m2=3, R sn1 =R sn2 .

[0190] For example, continue to refer to Figure 1 The functions that the battery control system provided in this disclosure can achieve under specific operating conditions are described below:

[0191] Whether it's self-heating or boost charging, the corresponding functions are achieved through common-mode voltage control; the driving function is controlled by the differential-mode voltage of the bridge arm. The common-mode voltage and differential-mode voltage are added together to obtain the control voltage of each phase bridge arm. Through the modulation output duty cycle of the bridge arm, each function can be independently controlled to achieve the corresponding function.

[0192] For example:

[0193] (1) Driving condition + circulating heating: K9 engages, proceeding according to steps ③ and ④. Based on step ③, the differential mode duty cycles DD11, DD21, and DD31 of the first motor's dq coordinate system and DD12, DD22, and DD32 of the second motor's dq coordinate system are obtained. Based on step ④, the common mode duty cycle Dpc1 of the first motor's dq coordinate system and Dpc2 of the second motor's dq coordinate system are obtained. The common mode duty cycle plus the differential mode duty cycle are used to obtain the six-arm duty cycles of the two three-phase motors for current control, thereby achieving circulating heating control under driving conditions.

[0194] (2) Parking condition + circulating heating: K9 is engaged, and the process is carried out according to ④. According to ④, the common mode duty cycle Dpc1 of the first motor dq coordinate system is obtained, and the actual duty cycles Da1, Db1, and Dc1 of the three-phase bridge arms of A1B1C1 are obtained respectively, where Da1=Db1=Dc1=Dpc1. The common mode duty cycle Dpc2 of the second motor dq coordinate system is obtained, and the actual duty cycles Da2, Db2, and Dc2 of the three-phase bridge arms of A2B2C2 are obtained respectively, where Da2=Db2=Dc2=Dpc2. The six-bridge arm duty cycles of the two three-phase motors are obtained for current control to realize the circulating heating control under the parking condition.

[0195] (3) Parking condition + DC boost charging / buck discharging: Following the process in ②, based on the common-mode duty cycle Dp1 of the first motor's dq coordinate system, the actual duty cycles D11, D21, and D31 of the three-phase bridge arms A1B1C1 are obtained, where D11=D21=D31=Dp1, and DC boost charging / buck discharging control is performed; based on the second motor's dq... The common-mode duty cycle Dp2 of the coordinate system is used to obtain the actual duty cycles D12, D22, and D32 of the three-phase bridge arms A2B2C2, where D12=D22=D32=Dp2. DC boost charging / buck discharging control is implemented. The duty cycles of the two motor three-phase bridge arms are obtained for current control, realizing the boost charging function of the first electric drive and the boost charging / discharging function of the second motor system. It also includes the functions of simultaneous dual-gun charging and discharging at both DC charging / discharging ports, simultaneous discharging, simultaneous charging and discharging, charging and discharging at any one charging port, and high-power charging and discharging at a single gun. The high-power charging and discharging function at a single gun is achieved by engaging K9 in the diagram, allowing the insertion of a gun into any charging / discharging port, and alternating between the boost charging functions of the first and second electric drive circuits.

[0196] (4) Parking condition + DC boost charging / buck discharging + self-heating: According to the process of ① and ②, according to the common mode duty cycle Dp1 of the first motor dq coordinate system, the actual duty cycles Da1, Db1, and Dc1 of the three-phase bridge arm of A1B1C1 are obtained respectively, where Da1=Db1=Dc1=Dp1, and DC boost charging / buck discharging control is performed; according to the common mode duty cycle Dp2 of the second motor dq coordinate system, the actual duty cycles Da2, Db2, and Dc2 of the three-phase bridge arm of A2B2C2 are obtained respectively, where Da2=Db2=Dc2=Dp2, and self-heating control is performed; the duty cycles of the two motor three-phase bridge arms are obtained for current control, realizing the boost charging function of the first electric drive circuit system and the self-heating function of the second electric drive circuit system.

[0197] (5) Parking condition + DC direct charging and discharging + self-heating: According to the process of ① and ②, the first charging and discharging port is directly connected for charging and discharging; according to the common mode duty cycle Dp1 of the first motor dq coordinate system, the actual duty cycles Da1, Db1, and Dc1 of the three-phase bridge arm of A1B1C1 are obtained respectively, where Da1=Db1=Dc1=Dp1, realizing the self-heating function of the first electric drive circuit system; according to the common mode duty cycle Dp2 of the second motor dq coordinate system, the actual duty cycles Da2, Db2, and Dc2 of the three-phase bridge arm of A2B2C2 are obtained respectively; where Da2=Db2=Dc2=Dp2, realizing the self-heating function of the second electric drive circuit 32 system.

[0198] (6) Parking mode + self-heating: Based on the common mode duty cycle Dp1 of the first motor dq coordinate system, the actual duty cycles Da1, Db1, and Dc1 of the three-phase bridge arms of A1B1C1 are obtained respectively, where Da1=Db1=Dc1=Dp1, realizing the self-heating function of the first electric drive circuit system; based on the common mode duty cycle Dp2 of the second motor dq coordinate system, the actual duty cycles Da2, Db2, and Dc2 of the three-phase bridge arms of A2B2C2 are obtained respectively, where Da2=Db2=Dc2=Dp2, realizing the self-heating function of the second electric drive circuit 32 system.

[0199] (7) Driving condition + DC boost charging / buck discharging + self-heating: Based on processes ①, ②, and ③, the common-mode duty cycle Dp1 of the first motor dq coordinate system is added to the differential-mode duty cycles DD11, DD21, and DD31 respectively to obtain the actual duty cycles Da1, Db1, and Dc1 of the A1B1C1 three-phase bridge arms, and driving + DC boost charging / buck discharging control is performed; based on the second motor dq The common-mode duty cycle Dp2 of the coordinate system is added to the differential-mode duty cycles DD12, DD22, and DD32 respectively to obtain the actual duty cycles Da2, Db2, and Dc2 of the A2B2C2 three-phase bridge arms, which are used for driving and self-heating control. The duty cycles of the two motor three-phase bridge arms are obtained for current control, realizing the driving and DC boost charging / buck discharging control of the first electric drive circuit system and the driving and self-heating function of the second electric drive circuit system. Alternatively, the driving and self-heating function of the first electric drive circuit system and the driving and DC boost charging / buck discharging function of the second electric drive circuit system can be implemented according to processes ①, ②, and ③, with the process being the same as above, except that the windings are swapped to achieve their respective functions. The first and second electric drive circuit systems work together to achieve the driving condition + DC boost charging / buck discharging + self-heating function.

[0200] (8) Driving Condition + DC Boost Charging / Buck Discharging: Based on the processes in ② and ③, the common-mode duty cycle Dp1 of the first motor dq coordinate system is added to the differential-mode duty cycles DD11, DD21, and DD31 respectively to obtain the actual duty cycles Da1, Db1, and Dc1 of the three-phase bridge arms of A1B1C1, and driving + DC boost charging / buck discharging control is performed; the common-mode duty cycle Dp2 of the second motor dq coordinate system is added to the differential-mode duty cycles DD12, DD22, and DD32 respectively to obtain the actual duty cycles Da2, Db2, and Dc2 of the three-phase bridge arms of A2B2C2, and driving + DC boost charging / buck discharging control is performed; the duty cycles of the two motor three-phase bridge arms are obtained for current control, realizing the driving + DC boost charging / buck discharging control of the first electric drive circuit system and the driving + DC boost charging / buck discharging control of the second electric drive circuit system, and the function of charging and discharging at any charging port during driving.

[0201] (9) Driving condition + self-heating: According to the process of ① and ③, the common mode duty cycle Dp1 of the first motor coordinate system is added to the differential mode duty cycles DD11, DD21 and DD31 respectively to obtain the actual duty cycles Da1, Db1 and Dc1 of the three-phase bridge arm of A1B1C1, and driving + self-heating control is performed; the common mode duty cycle Dp2 of the first motor dq coordinate system is added to the differential mode duty cycles DD12, DD22 and DD32 respectively to obtain the actual duty cycles Da2, Db2 and Dc2 of the three-phase bridge arm of A2B2C2, and driving + self-heating control is performed; the duty cycles of the two motor three-phase bridge arms are obtained for current control to realize the driving + self-heating function of the first electric drive circuit system and the second electric drive circuit.

[0202] It should be noted that during driving conditions, because K6 and K9 need to be engaged simultaneously, K6 connects the second self-heating circuit, and the first self-heating circuit cannot work independently. That is, the first and second self-heating circuits can work simultaneously, or the second self-heating circuit can work independently. When activating the self-heating function during driving conditions, the second self-heating circuit is activated first. If high-power self-heating is required, the first self-heating circuit is activated then. When deactivating the self-heating function during driving conditions, the first self-heating circuit is deactivated first. If it is necessary to turn off the self-heating function, the first self-heating circuit is deactivated then, so that the vehicle's self-heating function is turned off.

[0203] The above examples illustrate some combined functions achieved by combining the first electric drive circuit system and the second electric drive circuit system in the battery control system of this disclosure, such as charging self-heating function, dual-gun charging and discharging function, dual-system parking dual self-heating function, dual-system driving dual self-heating function, and single-gun dual-system high-power charging and discharging.

[0204] In another exemplary embodiment, a vehicle is also provided, including the battery charging system provided in the embodiments of this disclosure.

[0205] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of this disclosure. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0206] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery control system, characterized in that, include: A power battery pack, the power battery pack comprising a first battery pack and a second battery pack connected in series; Multiple electric drive circuits and a charging / discharging port corresponding to each of the electric drive circuits; The first end of each electric drive circuit is connected to the power battery pack, the second end of each electric drive circuit is connected between the first battery pack and the second battery pack, and the second end of each electric drive circuit is connected to the charging and discharging port. Any of the charging / discharging ports, the power battery pack, and the multiple electric drive circuits can form a high-power boost charging circuit with a single charging gun. When the power battery pack is charged through any of the charging and discharging ports, the plurality of electric drive circuits are configured to alternately perform boost charging for the power battery pack to form a high-power boost charging circuit for the single charging gun. Each of the aforementioned electric drive circuits includes: An inverter, wherein the first bus terminal of the inverter is connected to the positive terminal of the first battery pack, and the second bus terminal of the inverter is connected between the negative terminal of the second battery pack and the negative terminal of the charging / discharging port; The motor has a winding that includes multiple pole pairs. Each pole pair includes three coil branches. The first ends of the coil branches of the same phase in the three coil branches of the multiple pole pairs are connected together and are connected one-to-one with the midpoint of the bridge arm of the inverter. The second ends of the three coil branches of each pole pair are connected together to form a pole. In this configuration, some or all of the poles of the motor windings are connected together and a first N-line is led out. The first N-line is connected to the positive terminal of the charging / discharging port, and the first N-line is connected between the first battery pack and the second battery pack. Alternatively, some poles of the motor windings are connected together and a second N-line is led out, the second N-line is connected to the positive terminal of the charging / discharging port, and another portion of the poles of the motor windings are connected together and a third N-line is led out, the third N-line is connected between the first battery pack and the second battery pack.

2. The battery control system according to claim 1, characterized in that, The battery control system also includes: inductance; The first bus terminals of the inverters in the two electric drive circuits are connected via the inductor.

3. The battery control system according to claim 1, characterized in that, Any of the electric drive circuits and the power battery pack can form a self-heating circuit, and the battery control system further includes: A charge / discharge on / off switch unit, wherein the charge / discharge on / off switch unit is configured to: enable or disable the high-power boost charging circuit; The self-heating on / off switch unit is configured to enable or disable the self-heating circuit.

4. The battery control system according to claim 3, characterized in that, The battery control system also includes: The controller is connected to the inverter, the charge / discharge on / off switch unit, and the self-heating on / off switch unit in each of the electric drive circuits. The controller is configured to control the inverter, the charge / discharge on / off switch unit, and the self-heating on / off switch unit in each of the electric drive circuits, so that at least one of the charge / discharge function, the self-heating function, and the drive function is realized.

5. The battery control system according to claim 4, characterized in that, The plurality of electric drive circuits include a first electric drive circuit and a second electric drive circuit, and the charging and discharging port includes a first charging and discharging port corresponding to the first electric drive circuit and a second charging and discharging port corresponding to the second electric drive circuit. The power battery pack and the first electric drive circuit can form a first self-heating circuit, and the power battery pack and the second electric drive circuit can form a second self-heating circuit; the self-heating on / off switch unit includes a first self-heating on / off switch unit and a second self-heating on / off switch unit; the first self-heating on / off switch unit is configured to make the first self-heating circuit conduct or disconnect; the second self-heating on / off switch unit is configured to make the second self-heating circuit conduct or disconnect.

6. The battery control system according to claim 5, characterized in that, The controller is configured to: When in the first state, the inverter in the first electric drive circuit, the inverter in the second electric drive circuit, and the charge / discharge on / off switch unit are controlled so that the electrical energy input from the first charge / discharge port or the second charge / discharge port is alternately charged to the power battery pack through the first electric drive circuit and the second electric drive circuit.

7. The battery control system according to claim 5, characterized in that, The controller is configured to: When in the second state, the inverter in the first electric drive circuit, the inverter in the second electric drive circuit, and the self-heating on / off switch unit are controlled so that the first battery pack and the second battery pack are alternately charged and discharged to heat the power battery pack.

8. The battery control system according to claim 5, characterized in that, The controller is configured to: When in the third state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the first charge / discharge port to power the first load; and the inverter in the second electric drive circuit and the second self-heating on / off switch unit are controlled so that the first battery pack and the second battery pack are charged and discharged alternately to heat the power battery pack.

9. The battery control system according to claim 5, characterized in that, The controller is configured to: When in the fourth state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter in the second electric drive circuit and the second self-heating on / off switch unit are controlled so that the first battery pack and the second battery pack are charged and discharged alternately to heat the power battery pack.

10. The battery control system according to claim 5, characterized in that, The controller is configured to: When in the fifth state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the first charge / discharge port to power the first load; and the inverter in the second electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the second charge / discharge port to power the second load.

11. The battery control system according to claim 5, characterized in that, The controller is configured to: When in the sixth state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter in the second electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the second charge / discharge port is output to the power battery pack to charge the power battery pack.

12. The battery control system according to claim 5, characterized in that, The controller is configured to: When in the seventh state, the inverter in the first electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy input through the first charge / discharge port is output to the power battery pack to charge the power battery pack; and the inverter in the second electric drive circuit and the charge / discharge on / off switch unit are controlled so that the electrical energy output by the power battery pack is output to the second charge / discharge port to supply power to the second load.

13. The battery control system according to any one of claims 5-12, characterized in that, The controller is configured to: By controlling the inverter in the first electric drive circuit, the electrical energy of the power battery pack is output to the motor in the first electric drive circuit to drive the vehicle, and / or, by controlling the inverter in the second electric drive circuit, the electrical energy of the power battery pack is output to the motor in the second electric drive circuit to drive the vehicle.

14. The battery control system according to claim 5, characterized in that, The controller is configured to: The phases of the inverter arm group controlling the first electric drive circuit and the inverter arm group controlling the second electric drive circuit are the same, and the phases of any two phase arms in the inverter arm group controlling the first electric drive circuit are staggered, and the phases of any two phase arms in the inverter arm group controlling the second electric drive circuit are staggered.

15. The battery control system according to claim 5, characterized in that, The controller is configured to: The phases of the inverter arm groups of the first electric drive circuit and the inverter arm groups of the second electric drive circuit are staggered, and the phases of all arms in the inverter arm group of the first electric drive circuit are the same, and the phases of all arms in the inverter arm group of the second electric drive circuit are the same.

16. The battery control system according to claim 5, characterized in that, The controller is configured to: The phases of the inverter arm groups of the first electric drive circuit and the inverter arm groups of the second electric drive circuit are staggered, and the phases of any two phase arms in the inverter arm group of the first electric drive circuit are staggered, and the phases of any two phase arms in the inverter arm group of the second electric drive circuit are staggered; or, The phases of the bridge arm groups of the inverter in the first electric drive circuit and the bridge arm groups of the inverter in the second electric drive circuit are the same, and the phases of all bridge arms in the bridge arm groups of the inverter in the first electric drive circuit are the same, and the phases of all bridge arms in the bridge arm groups of the inverter in the second electric drive circuit are the same.

17. A vehicle, characterized in that, The battery control system includes any one of claims 1-16 above.

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