Battery control system and vehicle

Abstract

The present disclosure relates to a battery control system and a vehicle, the battery control system comprising: a charge-discharge port; a power battery pack comprising a first battery group and a second battery group connected in series; a first electric drive circuit, a first end of the first electric drive circuit being connected with the power battery pack, and a second end of the first electric drive circuit being connected with the charge-discharge port; a second electric drive circuit, a first end of the second electric drive circuit being connected with the power battery pack, and a second end of the first electric drive circuit being connected between the first battery group and the second battery group; the power battery pack, the first electric drive circuit and the charge-discharge port being capable of forming a boost charging loop; and the power battery pack and the second electric drive circuit being capable of forming a self-heating loop.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicle control, in particular to a battery control system and a vehicle. BACKGROUND

[0002] Lithium ion batteries are relatively sensitive to low temperature. The internal resistance of lithium ion batteries sharply increases at low temperature, and the discharge capacity and charge-discharge performance are greatly limited, which leads to insufficient power performance of electric vehicles in low temperature environment and a significant reduction in driving range.

[0003] In related technologies, a single-phase winding of a motor on a vehicle is usually used to charge or self-heat the power battery pack according to the charge-discharge demand and self-heating demand of the power battery pack. However, as more and more motors are used on vehicles, the related technologies do not consider how to more reasonably use multiple motors to achieve the cooperation of charging and self-heating of the power battery pack. SUMMARY

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

[0005] To achieve the above purpose, a first aspect of an embodiment of the present disclosure provides a battery control system, comprising:

[0006] a charge-discharge port;

[0007] a power battery pack, the power battery pack comprising a first battery group and a second battery group connected in series;

[0008] a first electric drive circuit, a first end of the first electric drive circuit being connected with the power battery pack, and a second end of the first electric drive circuit being connected with the charge-discharge port;

[0009] a second electric drive circuit, a first end of the second electric drive circuit being connected with the power battery pack, and a second end of the first electric drive circuit being connected between the first battery group and the second battery group;

[0010] the power battery pack, the first electric drive circuit and the charge-discharge port can constitute a boost charging loop;

[0011] the power battery pack and the second electric drive circuit can constitute a self-heating loop.

[0012] Optionally, the first electric drive circuit comprises:

[0013] a first inverter, a first bus end of the first inverter being connected with a positive electrode of the first battery group, and a second bus end of the first inverter being connected between a negative electrode of the second battery group and a negative electrode of the charge-discharge port;

[0014] The first motor has windings comprising a plurality of first pole pairs, each of the first pole pairs comprising three coil branches, first ends of the same phase coil branches of the three coil branches of the plurality of first pole pairs being connected in common and connected to the bridge arm midpoints of the first inverter one by one, second ends of the three coil branches of the plurality of first pole pairs being connected in common to form neutral points, and part or all of the neutral points of the windings of the first motor being connected in common and leading to a first N line, the first N line being connected to the positive electrode of the charging and discharging port.

[0015] Optionally, the second electric drive circuit comprises:

[0016] The second inverter has a first bus connected to the positive electrode of the first battery pack and a second bus connected to the negative electrode of the second battery pack.

[0017] The second motor has windings comprising a plurality of second pole pairs, each of the second pole pairs comprising three coil branches, first ends of the same phase coil branches of the three coil branches of the plurality of second pole pairs being connected in common and connected to the bridge arm midpoints of the second inverter one by one, second ends of the three coil branches of the plurality of first pole pairs being connected in common to form neutral points, and part or all of the neutral points of the windings of the second motor being connected in common and leading to a second N line, the second N line being connected between the first battery pack and the second battery pack.

[0018] Optionally, the battery control system further comprises:

[0019] An inductor.

[0020] The first bus of the first electric drive circuit and the first bus of the second electric drive circuit are connected through the inductor.

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

[0022] A charging and discharging on-off switch unit configured to make the boost charging circuit conductive or disconnected.

[0023] A self-heating on-off switch unit configured to make the self-heating circuit conductive or disconnected.

[0024] Optionally, the battery control system further comprises:

[0025] A controller connected to the first inverter, the second inverter, the charging and discharging on-off switch unit, and the self-heating on-off switch unit, respectively.

[0026] The controller is configured to control the first inverter, the second inverter, the charge-discharge switch unit and the self-heating switch unit, so that at least one of the charging / discharging function, the self-heating function and the driving function is implemented.

[0027] Optionally, the controller is configured to:

[0028] When in the first state, the first inverter and the charge-discharge switch unit are controlled so that the electric energy output by the power battery pack is transmitted to the charge-discharge port to supply power to the load; and the second inverter and the self-heating switch unit are controlled so that the first battery group and the second battery group are alternately charged and discharged to heat the power battery pack.

[0029] Optionally, the controller is configured to:

[0030] When in the second state, the first inverter and the charge-discharge switch unit are controlled so that the electric energy input through the charge-discharge port is output to the power battery pack to charge the power battery pack; and the second inverter and the self-heating switch unit are controlled so that the first battery group and the second battery group are alternately charged and discharged to heat the power battery pack.

[0031] Optionally, the controller is configured to:

[0032] The electric energy of the power battery pack is output to the first motor to drive the vehicle through control of the first inverter, and / or the electric energy of the power battery pack is output to the second motor to drive the vehicle through control of the second inverter.

[0033] Optionally, the controller is configured to:

[0034] The phases of the bridge arm groups of the first inverter and the bridge arm groups of the second inverter are controlled to be the same, and the phases of any two-phase bridge arms in the bridge arm groups of the first inverter are controlled to be staggered, and the phases of any two-phase bridge arms in the bridge arm groups of the second inverter are controlled to be staggered.

[0035] Optionally, the controller is configured to:

[0036] The phases of the bridge arm groups of the first inverter and the bridge arm groups of the second inverter are controlled to be staggered, and the phases of all bridge arms in the bridge arm groups of the first inverter are controlled to be the same, and the phases of all bridge arms in the bridge arm groups of the second inverter are controlled to be the same.

[0037] Optionally, the controller is configured to:

[0038] The phases between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter are controlled to be staggered, and the phases of any two-phase bridge arms in the bridge arm groups of the first inverter are controlled to be staggered, and the phases of any two-phase bridge arms in the bridge arm groups of the second inverter are controlled to be staggered.

[0039] Optionally, the controller is configured to:

[0040] The phases between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter are controlled to be the same, and the phases of all bridge arms in the bridge arm groups of the first inverter are controlled to be the same, and the phases of all bridge arms in the bridge arm groups of the second inverter are controlled to be the same.

[0041] According to a second aspect of the embodiments of the present disclosure, a vehicle is provided, which comprises the battery control system according to any one of the first aspect of the present disclosure.

[0042] By the above technical solution, the battery control system comprises: a charge-discharge port; a power battery pack comprising a first battery group and a second battery group connected in series; a first electric drive circuit, a first end of the first electric drive circuit being connected to the power battery pack, and a second end of the first electric drive circuit being connected to the charge-discharge port; and a second electric drive circuit, a first end of the second electric drive circuit being connected to the power battery pack, and a second end of the first electric drive circuit being connected between the first battery group and the second battery group; the power battery pack, the first electric drive circuit and the charge-discharge port can form a boost charging loop, so that the power battery pack is boosted and charged by the power input through the charge-discharge port; the power battery pack and the second electric drive circuit can form a self-heating loop, so that the first battery group and the second battery group can alternately charge and discharge to heat the power battery pack, thereby realizing the cooperation of the boost charging function and the self-heating function of the power battery pack.

[0043] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0045] Figure 1 is a circuit diagram of a battery control system according to an exemplary embodiment.

[0046] Figure 2 is a circuit diagram of another battery control system according to an exemplary embodiment.

[0047] Figure 3is a circuit diagram of another battery control system according to an exemplary embodiment.

[0048] Figure 4 is a circuit diagram of another battery control system according to an exemplary embodiment.

[0049] Figure 5 is a circuit diagram of a battery control system with charging function according to an exemplary embodiment.

[0050] Figure 6 is a circuit diagram of another battery control system with charging function according to an exemplary embodiment.

[0051] Figure 7 is a circuit diagram of a battery control system with discharging function according to an exemplary embodiment.

[0052] Figure 8 is a circuit diagram of another battery control system with discharging function according to an exemplary embodiment.

[0053] Figure 9 is a circuit diagram of a battery control system with driving function according to an exemplary embodiment.

[0054] Figure 10 is a circuit diagram of another battery control system with driving function according to an exemplary embodiment.

[0055] Figure 11 is a circuit diagram of a battery control system with self-heating function according to an exemplary embodiment.

[0056] Figure 12 is a circuit diagram of another battery control system with self-heating function according to an exemplary embodiment.

[0057] Figure 13 is a circuit diagram of another battery control system with self-heating function according to an exemplary embodiment.

[0058] Figure 14 is a circuit diagram of another battery control system with self-heating function according to an exemplary embodiment.

[0059] Figure 15 is a circuit diagram of a battery control system with discharging and self-heating function according to an exemplary embodiment.

[0060] Figure 16 is a circuit diagram of another battery control system with discharging and self-heating function according to an exemplary embodiment.

[0061] Figure 17 is a circuit diagram of another battery control system with discharging and self-heating functions according to an example embodiment.

[0062] Figure 18 is a circuit diagram of another battery control system with discharging and self-heating functions according to an example embodiment.

[0063] Figure 19 is a circuit diagram of a battery control system with charging and self-heating functions according to an example embodiment.

[0064] Figure 20 is a circuit diagram of another battery control system with charging and self-heating functions according to an example embodiment.

[0065] Figure 21 is a circuit diagram of another battery control system with charging and self-heating functions according to an example embodiment.

[0066] Figure 22 is a circuit diagram of another battery control system with charging and self-heating functions according to an example embodiment. DETAILED DESCRIPTION

[0067] The detailed description of the disclosure is described below in conjunction with the accompanying drawings. It should be understood that the detailed description described herein is only used to illustrate and explain the disclosure, and is not used to limit the disclosure.

[0068] With more and more motors on vehicles, the related art usually uses the single-phase winding of the motor on the vehicle to charge or self-heat the power battery pack 10, which cannot achieve reasonable utilization of multiple motors and cannot realize the coordinated boosting charging and self-heating of the power battery pack 10.

[0069] To solve the above technical problems, the battery control system comprises: a charge-discharge port; a power battery pack 10, the power battery pack 10 comprising a first battery group E1 and a second battery group E2 connected in series; a first electric drive circuit 31, a first end of the first electric drive circuit 31 being connected with the power battery pack 10, and a second end of the first electric drive circuit 31 being connected with the charge-discharge port; a second electric drive circuit 32, a first end of the second electric drive circuit 32 being connected with the power battery pack 10, and a second end of the first electric drive circuit 31 being connected between the first battery group E1 and the second battery group E2; the power battery pack 10, the first electric drive circuit 31 and the charge-discharge port can form a boost charging loop, so that the power battery pack 10 is boosted and charged by the power input through the charge-discharge port; the power battery pack 10 and the second electric drive circuit 32 can form a self-heating loop, so that the first battery group E1 and the second battery group E2 can alternately charge and discharge to heat the power battery pack 10, thereby realizing the cooperation of the boost charging function and the self-heating function of the power battery pack 10.

[0070] Figure 1 is a circuit diagram of a battery control system according to an exemplary embodiment, as shown in Figure 1 the battery control system comprises: a charge-discharge port, a power battery pack 10, a first electric drive circuit 31 and a second electric drive circuit 32.

[0071] The charge-discharge port.

[0072] The charge-discharge port is used for inputting or outputting power, for example, the charge-discharge port can be connected with a discharge gun or other load to supply power to the other load, and the charge-discharge port can also be connected with a charging gun or a charging device to receive power to charge the power battery pack 10, and the charging device can be a wireless charging device or a photovoltaic charging device.

[0073] The power battery pack 10 comprises a first battery group E1 and a second battery group E2 connected in series.

[0074] The power battery pack 10 comprises a first battery group E1 and a second battery group E2 connected in series, wherein each battery group can be composed of a plurality of battery units (or battery sections) connected in series, the number of battery units contained in the first battery group E1 and the second battery group E2 can be the same, and the number of battery units contained in the power battery pack 10 can be an even number.

[0075] The first electric drive circuit 31, a first end of the first electric drive circuit 31 being connected with the power battery pack 10, and a second end of the first electric drive circuit 31 being connected with the charge-discharge port.

[0076] The second electric drive circuit 32, a first end of the second electric drive circuit 32 being connected with the power battery pack 10, and a second end of the first electric drive circuit 31 being connected between the first battery group E1 and the second battery group E2.

[0077] The first end of the first electric drive circuit 31 is connected with two electrodes of the power battery pack 10, and the second point of the first electric drive circuit 31 is connected with the charge-discharge port. The first end of the second electric drive circuit 32 is connected with two electrodes of the power battery pack 10.

[0078] The power battery pack 10, the first electric drive circuit 31 and the charge-discharge port can constitute a boost charging loop, so that the power battery pack 10 is boosted and charged by the power input through the charge-discharge port.

[0079] The power battery pack 10 and the second electric drive circuit 32 can constitute a self-heating loop, so that the first battery pack E1 and the second battery pack E2 can alternately charge and discharge to heat the power battery pack 10.

[0080] Based on the above connection structure of the battery control system, the battery control system comprises: a charge-discharge port; a power battery pack 10, the power battery pack 10 comprising a first battery pack E1 and a second battery pack E2 connected in series; a first electric drive circuit 31, the first end of the first electric drive circuit 31 being connected with the power battery pack 10, and the second end of the first electric drive circuit 31 being connected with the charge-discharge port; a second electric drive circuit 32, the first end of the second electric drive circuit 32 being connected with the power battery pack 10, and the second end of the first electric drive circuit 31 being connected between the first battery pack E1 and the second battery pack E2; the power battery pack 10, the first electric drive circuit 31 and the charge-discharge port can constitute a boost charging loop, so that the power battery pack 10 is boosted and charged by the power input through the charge-discharge port; the power battery pack 10 and the second electric drive circuit 32 can constitute a self-heating loop, so that the first battery pack E1 and the second battery pack E2 can alternately charge and discharge to heat the power battery pack 10, thereby realizing the cooperation of the boost charging function and the self-heating function of the power battery pack 10.

[0081] In a possible implementation, the first electric drive circuit 31 comprises:

[0082] A first inverter, the first bus end of the first inverter being connected with the positive electrode of the first battery pack E1, and the second bus end of the first inverter being connected between the negative electrode of the second battery pack E2 and the negative electrode of the charge-discharge port.

[0083] The inverter comprises a plurality of parallel bridge arms, the first ends of the plurality of parallel bridge arms being commonly connected to form the first bus end, and the second ends of the plurality of parallel bridge arms being commonly connected to form the second bus end. The first bus end of the first inverter is connected with the positive electrode of the first battery pack E1, the second bus end of the first inverter is connected with the negative electrode of the second battery pack E2, and the second bus end is connected with the negative electrode of the charge-discharge port.

[0084] The first motor, the winding of the first motor includes a plurality of first pairs of poles, each first pair of poles includes three coil branches, the first ends of the same phase coil branches of the three coil branches of the plurality of first pairs of poles are connected in common and are connected in one-to-one correspondence with the bridge arm midpoints of the first inverter, the second ends of the three coil branches of the plurality of first pairs of poles are connected in common to form a neutral point, and part or all of the neutral points of the winding of the first motor are connected in common and a first N line is led out, and the first N line is connected with the positive electrode of the charging and discharging port.

[0085] The second ends of the three coil branches of the plurality of first pairs of poles are connected in common to form a neutral point. For example, the second ends of the three coil branches of two first pairs of poles can be connected in common to form one neutral point, the second ends of the three coil branches of the other two first pairs of poles can be connected in common to form one neutral point, and the number of the neutral points formed by the second ends of the three coil branches of the plurality of first pairs of poles can be one or more.

[0086] For example, as shown in Figure 1 and Figure 2 , the first inverter includes three bridge arms, wherein VT1, VD1, VT2, and VD2 constitute one bridge arm, VT3, VD3, VT4, and VD4 constitute one bridge arm, and VT5, VD5, VT6, and VD6 constitute one bridge arm, the winding of the first motor includes four first pairs of poles, each first pair of poles includes three coil branches, the first ends of the same phase coil branches of the three coil branches of the four first pairs of poles are connected in common to obtain ABC three-phase, and the ABC three-phase is connected in one-to-one correspondence with the bridge arm midpoints A1B1C1 of the first inverter. The four first pairs of poles, i.e., pole point n1, pole point n2, pole point n3, and pole point n4, the second ends of the three coil branches of the four first pairs of poles are connected in common, pole point n1 and pole point n2 are connected in common, pole point n3 and pole point n4 are connected in common, two neutral points are obtained, part or all of the two neutral points, i.e., one or more, are connected in common to lead out a first N line, and the first N line is connected with the positive electrode of the charging and discharging port.

[0087] For example, pole point n1, pole point n2, pole point n3, and pole point n4 can be connected in common to lead out the first N line; pole point n1 and pole point n2 can also be connected in common to lead out the first N line; or pole point n2, pole point n3, and pole point n4 can be connected in common to lead out the first N line.

[0088] In the embodiment, the first ends of the multiple first pole pairs of the winding of the first motor are connected to the bridge arm midpoints of the first inverter, the second ends of the multiple first pole pairs form a neutral point, and the neutral points of the winding of the first motor are connected to the first N line and the positive electrode of the charging and discharging port. In this way, the power battery pack 10, the first inverter, the first motor and the charging and discharging port can form a boost charging circuit, so that the power supplied by the charging and discharging port can be sequentially boosted by the first inverter and the first motor to charge the power battery pack 10, and the power battery pack 10 can also output power to the charging and discharging port through the boost charging circuit to supply power to the load.

[0089] In a possible implementation, the second electric drive circuit 32 includes:

[0090] The second inverter has a first bus end connected to the positive electrode of the first battery pack E1 and a second bus end connected to the negative electrode of the second battery pack E2.

[0091] The inverter includes multiple parallel bridge arms, the first ends of the multiple parallel bridge arms are connected to form a first bus end, and the second ends of the multiple parallel bridge arms are connected to form a second bus end. The first bus end of the second inverter is connected to the positive electrode of the first battery pack E1, and the second bus end of the second inverter is connected to the negative electrode of the second battery pack E2.

[0092] The second motor has a winding including multiple second pole pairs, each second pole pair including three coil branches, the first ends of the coil branches of the same phase of the multiple second pole pairs are connected to the bridge arm midpoints of the second inverter one by one, and the second ends of the coil branches of the multiple second pole pairs form a neutral point. The neutral points of the winding of the second motor are connected to the second N line, and the second N line is connected between the first battery pack E1 and the second battery pack E2.

[0093] The second ends of the coil branches of the multiple second pole pairs form a neutral point. For example, the second ends of the coil branches of two second pole pairs form a neutral point, the second ends of the coil branches of the other two second pole pairs form a neutral point, and the second ends of the coil branches of the multiple first pole pairs form one or more neutral points.

[0094] For example, as Figure 1 and Figure 2As shown, the second inverter includes three bridge arms, wherein VT21, VD21, VT24, and VD24 form a bridge arm, VT22, VD22, VT25, and VD25 form a bridge arm, and VT23, VD23, VT26, and VD26 form a bridge arm, the winding of the second motor includes four second poles, each of which includes three coil branches, the first ends of the same-phase coil branches of the three coil branches of the four second poles are connected in common to obtain A'B'C' three-phase, and the A'B'C' three-phase is connected in one-to-one correspondence with the bridge arm midpoints A2B2C2 of the second inverter. The four second poles are pole n1', pole n2', pole n3', and pole n4', the second ends of the three coil branches of the four second poles are connected in common, pole n1' and pole n2' are connected in common, pole n3' and pole n4' are connected in common, two neutral points are obtained, and part or all of the two neutral points, i.e., one or more, are connected in common to lead out a second N line, which is connected between the first battery pack E1 and the second battery pack E2.

[0095] The first ends of the multiple second poles of the winding of the second motor are connected with the bridge arm midpoints of the second inverter, the second ends of the multiple second poles form a neutral point, part or all of the neutral points of the winding of the second motor are connected in common, and a second N line is led out and connected between the first battery pack E1 and the second battery pack E2, so that the power battery pack 10, the second inverter, and the second motor can form a self-heating loop, the battery packs in the power battery pack 10 can store electrical energy into the second motor through the second inverter, and the electrical energy in the second motor can be transmitted to the battery packs through the second inverter, so as to realize mutual charging and discharging of the first battery pack E1 and the second battery pack E2 to heat the power battery pack 10.

[0096] For example, referring to Figure 1 The pole n1, the pole n2, the pole n3, and the pole n4 can be connected in common (at the neutral point N1), and a first N line is led out and connected with the positive electrode of the charging and discharging port; the pole n1', the pole n2', the pole n3', and the pole n4' can be connected in common (at the neutral point N2), and a second N line is led out and connected between the first battery pack E1 and the second battery pack E2.

[0097] For example, referring to Figure 2 The pole n1 and the pole n2 can be connected in common (at the neutral point N1), and a first N line is led out and connected with the positive electrode of the charging and discharging port; the pole n3' and the pole n4' can be connected in common (at the neutral point N2), and a second N line is led out and connected between the first battery pack E1 and the second battery pack E2.

[0098] For example, referring to Figure 3The pole point n1 and the pole point n2 can be connected in common (at the neutral point N1), and a first N line is led out and connected to the positive pole of the charging and discharging port; the pole point n3' and the pole point n4' are connected in common (at the neutral point N2), and a second N line is led out and connected between the first battery pack E1 and the second battery pack E2.

[0099] For example, refer to Figure 4 The pole point n1 and the pole point n2 can be connected in common (at the neutral point N1), and a first N line is led out and connected to the positive pole of the charging and discharging port; the pole point n3' and the pole point n4' are connected in common (at the neutral point N2), and a second N line is led out and connected between the first battery pack E1 and the second battery pack E2.

[0100] It should be noted that the number of parallel poles is different, the equivalent inductance of the motor is different, and the current carrying capacity of the N line is different; the same control mode: the more the number of poles in parallel for the same set of windings, the stronger the current carrying capacity of the N line, the smaller the inductance, and the larger the ripple on the N line; according to the demand for self-heating power and inductance, a proper number of poles in parallel is selected, the lead-out method and control algorithm are combined, the demand for inductance and overcurrent capacity of the self-heating circuit is met, and the demand for phase current ripple is met, thereby avoiding the problem of demagnetization of the motor caused by high temperature of the magnetic steel of the permanent magnet motor. In actual use, the number of n points in parallel and the number of N lines can be adjusted adaptively.

[0101] In a possible implementation, the battery control system further includes:

[0102] The inductance;

[0103] The first bus end of the first electric drive circuit 31 and the first bus end of the second electric drive circuit 32 are connected through an inductance.

[0104] By connecting the first bus end of the first electric drive circuit 31 and the first bus end of the second electric drive circuit 32 through the inductance L, the problem of bus current oscillation can be solved.

[0105] In a possible implementation, the battery control system further includes:

[0106] The charge-discharge on-off switch unit is configured to make the boost charging circuit conductive or disconnected. In the case that the boost charging circuit is conductive, the power battery pack 10 can be boosted charged through the boost charging circuit or the power battery pack 10 is discharged to supply power to the load.

[0107] The self-heating on-off switch unit is configured to make the self-heating circuit conductive or non-conductive. When the self-heating circuit is conductive, the alternating charging and discharging between the first battery pack E1 and the second battery pack E2 can be realized through the self-heating circuit to heat the power battery pack 10.

[0108] In a possible implementation, the battery control system further comprises a switch assembly, which can include the charging and discharging on-off switch unit and the self-heating on-off switch unit, and the switch assembly can specifically include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a fifth switch K5. The first switch K1 is arranged on a connection line between the positive electrode of the first battery pack E1 and the first bus bar; the second switch K2 is arranged on a connection line between the negative electrode of the second battery pack E2 and the second bus bar; the third switch K3 is arranged on a connection line between the second end of the first motor and the positive electrode of the charging and discharging port; the fourth switch K4 is arranged on a connection line between the second bus bar and the negative electrode of the charging and discharging port; and the fifth switch K5 is arranged on a connection line between the second end of the second motor and the first battery pack E1 and the second battery pack E2.

[0109] The charging on-off switch unit can include the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4, and the self-heating on-off switch unit can include the first switch K1, the second switch K2, and the fifth switch K5.

[0110] In a possible implementation, the battery control system further comprises:

[0111] The controller can be an MCU (Microcontroller Unit), and the controller is connected with the first inverter, the second inverter, the charging and discharging on-off switch unit, and the self-heating on-off switch unit, respectively.

[0112] The controller is configured to control the first inverter, the second inverter, the charging and discharging on-off switch unit, and the self-heating on-off switch unit, so that at least one of the charging / discharging function, the self-heating function, and the driving function is realized. That is, by controlling the first inverter, the second inverter, the charging and discharging on-off switch unit, and the self-heating on-off switch unit through the controller, the following functions can be realized: a single charging function, a single discharging function, a single driving function, a combination of the self-heating function and the charging function, a combination of the self-heating function and the discharging function, a system of the driving function and the self-heating function, a combination of the driving function and the charging function, a combination of the driving function and the discharging function, and the like.

[0113] In other possible embodiments, the charging switch unit can further include a sixth switch K6 for controlling the direct current charging and discharging. The controller can further realize the direct current charging function / direct current discharging function by controlling the sixth switch K6, and the direct current charging function / direct current discharging function can be coordinated with the self-heating function.

[0114] Please refer to Figure 5 and Figure 6 in combination with the battery control system to describe the realization of the charging function in the battery control system:

[0115] The control mode of the controller can be that the first control phase and the second control phase are alternately executed.

[0116] Please refer to Figure 5 , the first control phase is to control the third switch K3 and the fourth switch K4 to be closed, control the first switch K1, the second switch K2 and the fifth switch K5 to be disconnected, and control the lower bridge arm of the first inverter to be turned on and the upper bridge arm to be disconnected, control the upper bridge arm of the second inverter to be disconnected and the lower bridge arm to be disconnected. The first control phase is to discharge the charging and discharging port to charge the first motor, and the first motor stores energy.

[0117] Please refer to Figure 6 , the second control phase is to control the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 to be closed, control the fifth switch K5 to be disconnected, and control the upper bridge arm of the first inverter to be turned on and the lower bridge arm to be disconnected, control the upper bridge arm of the second inverter to be disconnected and the lower bridge arm to be disconnected. The second control phase is to discharge the charging and discharging port and boost through the first motor to charge the power battery pack 10.

[0118] Please refer to Figure 7 and Figure 8 in combination with the battery control system to describe the realization of the discharging function in the battery control system:

[0119] The control mode of the controller can be that the third control phase and the fourth control phase are alternately executed.

[0120] Please refer to Figure 7 , the third control phase is to control the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 to be closed, control the fifth switch K5 to be disconnected, and control the upper bridge arm of the first inverter to be turned on and the lower bridge arm to be disconnected, control the upper bridge arm of the second inverter to be disconnected and the lower bridge arm to be disconnected. The second control phase is to discharge the charging and discharging port and boost through the first motor to charge the power battery pack 10.

[0121] Please refer to Figure 8, the fourth control stage is to control the third switch K3 and the fourth switch K4 to be closed, control the first switch K1, the second switch K2 and the fifth switch K5 to be disconnected, and control the upper bridge arm in the first inverter to be disconnected and the lower bridge arm to be conducted, and control the upper bridge arm in the second inverter to be disconnected and the lower bridge arm to be disconnected. The first control stage is to discharge the first motor and supply power to the load through the charging and discharging port.

[0122] Please refer to Figure 9 and Figure 10 , in combination with the battery control system, the implementation of the driving function in the battery control system is described:

[0123] The control mode of the controller can be: alternately executing the fifth control stage and the sixth control stage.

[0124] Please refer to Figure 9 , the fifth control stage is to control the first switch K1, the second switch K2 and the fifth switch K5 to be closed, the third switch K3 and the fourth switch K4 to be disconnected, and control the upper bridge arm in the first inverter to be disconnected and the lower bridge arm to be disconnected, and control the upper bridge arm in the second inverter to be conducted and the lower bridge arm to be disconnected. The fifth control stage is to discharge the first battery pack E1 to supply power to the second motor to drive the vehicle.

[0125] Please refer to Figure 10 , the sixth control stage is to control the first switch K1, the second switch K2 and the fifth switch K5 to be closed, the third switch K3 and the fourth switch K4 to be disconnected, and control the upper bridge arm in the first inverter to be disconnected and the lower bridge arm to be disconnected, and control the upper bridge arm in the second inverter to be disconnected and the lower bridge arm to be conducted. The fifth control stage is to discharge the second battery pack E2 to supply power to the second motor to drive the vehicle.

[0126] Please refer to Figures 11-14 , in combination with the battery control system, the implementation of the self-heating function in the battery control system is described:

[0127] The control mode of the controller can be: sequentially and circularly executing the seventh control stage, the eighth control stage, the ninth control stage and the tenth control stage.

[0128] Please refer to Figure 11 , the seventh control stage is to control the first switch K1 and the fifth switch K5 to be closed, the second switch K2, the third switch K3 and the fourth switch K4 to be disconnected, and control the upper bridge arm in the first inverter to be disconnected and the lower bridge arm to be disconnected, and control the upper bridge arm in the second inverter to be conducted and the lower bridge arm to be disconnected. The seventh control stage is to discharge the first battery pack E1 to charge the second motor.

[0129] Please refer to Figure 12The eighth control stage is to control the second switch K2 and the fifth switch K5 to be closed, the first switch K1, the third switch K3 and the fourth switch K4 to be opened, and control the upper bridge arm in the first inverter to be opened, the lower bridge arm to be opened, control the upper bridge arm in the second inverter to be opened, and the lower bridge arm to be conducted. The eighth control stage is to discharge the second motor to charge the second battery pack E2.

[0130] Please refer to Figure 13 The ninth control stage is to control the second switch K2 and the fifth switch K5 to be closed, the first switch K1, the third switch K3 and the fourth switch K4 to be opened, and control the upper bridge arm in the first inverter to be opened, the lower bridge arm to be opened, control the upper bridge arm in the second inverter to be opened, and the lower bridge arm to be conducted. The eighth control stage is to discharge the second motor to charge the second battery pack E2.

[0131] Please refer to Figure 14 The tenth control stage is to control the first switch K1 and the fifth switch K5 to be closed, the second switch K2, the third switch K3 and the fourth switch K4 to be opened, and control the upper bridge arm in the first inverter to be opened, the lower bridge arm to be opened, control the upper bridge arm in the second inverter to be conducted, and the lower bridge arm to be opened. The tenth control stage is to discharge the second motor to charge the first battery pack E1. In a possible implementation, the controller is configured to:

[0132] When in the first state, the first inverter and the charge-discharge on-off switch unit are controlled so that the power battery pack 10 outputs the electric energy to the charge-discharge port to supply power to the load; and the second inverter and the self-heating on-off switch unit are controlled so that the first battery pack E1 and the second battery pack E2 are alternately charged and discharged to heat the power battery pack 10. The first state can be the cooperation of the discharging function and the self-heating function. That is, the combination of the third control stage, the fourth control stage, the seventh control stage, the eighth control stage, the ninth control stage and the tenth control stage.

[0133] For example, the control mode of the controller can be to sequentially and circularly execute the eleventh control stage, the twelfth control stage, the thirteenth control stage and the fourteenth control stage.

[0134] Please refer to Figure 15 The eleventh control stage is to control the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 to be closed, and control the upper bridge arm in the first inverter to be conducted, the lower bridge arm to be opened, control the upper bridge arm in the second inverter to be conducted, and the lower bridge arm to be opened. The eleventh control stage is to supply power to the load by the power battery pack 10 through the first motor and the charge-discharge port, and discharge the first battery pack E1 to charge the second motor.

[0135] Please refer to Figure 16, the twelfth control stage is that the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 are closed, the upper bridge arm in the first inverter is controlled to be turned off and the lower bridge arm is turned on, the upper bridge arm in the second inverter is controlled to be turned off and the lower bridge arm is turned on. The twelfth control stage is that the first motor is discharged to supply power to the load through the charging and discharging port, and the second motor is discharged to charge the second battery pack E2.

[0136] Please refer to Figure 17 , the thirteenth control stage is that the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 are closed, the upper bridge arm in the first inverter is controlled to be turned on and the lower bridge arm is turned off, the upper bridge arm in the second inverter is controlled to be turned off and the lower bridge arm is turned on. The thirteenth control stage is that the power battery pack 10 is discharged to supply power to the load through the first motor and the charging and discharging port, and the second battery pack E2 is discharged to charge the second motor.

[0137] Please refer to Figure 18 , the fourteenth control stage is that the first switch K1, the third switch K3, the fourth switch K4 and the fifth switch K5 are closed, the second switch K2 is controlled to be turned off, and the upper bridge arm in the first inverter is controlled to be turned off and the lower bridge arm is turned on, the upper bridge arm in the second inverter is controlled to be turned on and the lower bridge arm is turned off. The fourteenth control stage is that the first motor is discharged to supply power to the load through the charging and discharging port, and the second motor is discharged to charge the first battery pack E1.

[0138] In a possible implementation, the controller is configured to:

[0139] When in the second state, the first inverter and the charging and discharging on-off switch unit are controlled so that the electric energy input through the charging and discharging port is output to the power battery pack 10 to charge the power battery pack 10; and the second inverter and the self-heating on-off switch unit are controlled so that the first battery pack E1 and the second battery pack E2 are alternately charged and discharged to heat the power battery pack 10. The second state can be a cooperation of the charging function and the self-heating function. That is, a combination of the first control stage, the second control stage, the seventh control stage, the eighth control stage, the ninth control stage and the tenth control stage.

[0140] For example, the control mode of the controller can be that the fifteenth control stage, the sixteenth control stage, the seventeenth control stage and the eighteenth control stage are sequentially and circularly executed.

[0141] Please refer to Figure 19The fifteenth control stage is to control the first switch K1, the third switch K3, the fourth switch K4 and the fifth switch K5 to be closed, control the second switch K2 to be opened, and control the upper bridge arm of the first inverter to be opened and the lower bridge arm to be conducted, and control the upper bridge arm of the second inverter to be conducted and the lower bridge arm to be opened. The fifteenth control stage is to discharge the charging and discharging port to charge the first motor and discharge the first battery pack E1 to charge the second motor.

[0142] Please refer to Figure 20 The sixteenth control stage is to control the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 to be closed, and control the upper bridge arm of the first inverter to be conducted and the lower bridge arm to be opened, and control the upper bridge arm of the second inverter to be opened and the lower bridge arm to be conducted. The sixteenth control stage is to discharge the charging and discharging port and charge the power battery pack 10 through the first motor, and discharge the second motor to charge the second battery pack E2.

[0143] Please refer to Figure 21 The seventeenth control stage is to control the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 to be closed, control the first switch K1 to be opened, and control the upper bridge arm of the first inverter to be opened and the lower bridge arm to be conducted, and control the upper bridge arm of the second inverter to be opened and the lower bridge arm to be conducted. The seventeenth control stage is to discharge the charging and discharging port to charge the first motor and discharge the second battery pack E2 to charge the second motor.

[0144] Please refer to Figure 22 The eighteenth control stage is to control the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 to be closed, and control the upper bridge arm of the first inverter to be conducted and the lower bridge arm to be opened, and control the upper bridge arm of the second inverter to be conducted and the lower bridge arm to be opened. The eighteenth control stage is to discharge the charging and discharging port and charge the power battery pack 10 through the first motor, and discharge the second motor to charge the first battery pack E1.

[0145] In a possible implementation, the controller is configured to:

[0146] The power battery pack 10 is controlled to output electric energy to the first motor to drive the vehicle through control of the first inverter, and / or the power battery pack 10 is controlled to output electric energy to the second motor to drive the vehicle through control of the second inverter.

[0147] The driving function can be combined with the above control mode, or replace the self-heating function or the charging function in the above control mode.

[0148] In order to reduce the ripple, the bridge arm groups in the inverters and / or the inverters can be controlled asynchronously.

[0149] In a possible implementation, the controller is configured to:

[0150] The phases between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter are controlled to be the same, and the phases of any two-phase bridge arms in the bridge arm groups of the first inverter are controlled to be staggered, and the phases of any two-phase bridge arms in the bridge arm groups of the second inverter are controlled to be staggered. Synchronous control is achieved between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter, and asynchronous control is achieved within the bridge arm groups.

[0151] In a possible implementation, the controller is configured to:

[0152] The phases between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter are controlled to be staggered, and the phases of all bridge arms in the bridge arm groups of the first inverter are controlled to be the same, and the phases of all bridge arms in the bridge arm groups of the second inverter are controlled to be the same. Asynchronous control is achieved between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter, and synchronous control is achieved within the bridge arm groups.

[0153] In a possible implementation, the controller is configured to:

[0154] The phases between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter are controlled to be staggered, and the phases of any two-phase bridge arms in the bridge arm groups of the first inverter are controlled to be staggered, and the phases of any two-phase bridge arms in the bridge arm groups of the second inverter are controlled to be staggered. Asynchronous control is achieved between the bridge arm groups of the first inverter and the bridge arm groups of the second inverter, and asynchronous control is achieved within the bridge arm groups.

[0155] Optionally, the controller is configured to:

[0156] The phases between the bridge arm groups of the inverter of the first electric drive circuit and the bridge arm groups of the inverter of the second electric drive circuit are controlled to be the same, and the phases of all bridge arms in the bridge arm groups of the inverter of the first electric drive circuit are controlled to be the same, and the phases of all bridge arms in the bridge arm groups of the inverter of the second electric drive circuit are controlled to be the same. Synchronous control is achieved between the bridge arm groups of the inverter of the first electric drive circuit and the bridge arm groups of the inverter of the second electric drive circuit, and synchronous control is achieved within the bridge arm groups.

[0157] With the circuit topology of Figure 1 as an example, the battery boost charging and self-heating technology are demonstrated.

[0158] Control process: The control system receives the charging and discharging instructions and the self-heating power instructions, calculates the instructions to the corresponding control target variables through the instruction calculation module, controls the target variables, and realizes the corresponding functions.

[0159] The control system receives a boost charge-discharge instruction, a battery self-heating current amplitude instruction, a self-heating current frequency instruction, and a self-heating battery equalization current instruction:

[0160] ① Battery self-heating function;

[0161] The battery self-heating current amplitude instruction, the self-heating current frequency instruction, and the self-heating battery active equalization current instruction are given a self-heating current amplitude ip_x, a current frequency f_x, and a self-heating battery active equalization current indc_x, to obtain a current in_x* = indc_x + ipk_x*sin(2pi*f_x*t) or in_x* = indc_x + ipk_x*cos(2pi*f_x*t) on the N_x line; the required current value in_x* and the actual in_x current value (in_1 = -ia-ib-ic or in_2 = -iu-iv-iw) are controlled by PI or PR closed loop to obtain the required duty cycle Dn_x, and the upper bridge arm common mode duty cycle Dp_x = 1 - Dn_x. Dp_x here p refers to the number of phases of the motor, x refers to the xth motor, x = 1 refers to the 1st motor d-q coordinate control system, and x = 2 refers to the 2nd motor d-q coordinate control system. The present patent Figure 2 Here, the 2nd motor d-q coordinate control system is used for self-heating, x = 2, and each set of winding has three phases, where p = 1, 2, or 3 for each set of system.

[0162] ② Battery boost charging function;

[0163] Charge-discharge instruction: The charge-discharge instruction is determined by the voltage level of the charging pile and the battery pack to determine whether to charge directly or boost charge.

[0164] When the voltage of the charging pile is higher than the voltage of the battery pack, select direct charge-discharge, i.e., attract Figure 1 the first switch K1, the second switch K2, the fourth switch K4, and the sixth switch K6 in the first switch K1, the second switch K2, the fourth switch K4, and the sixth switch K6, and the bridge arm corresponding to the ABC three-phase winding is not controlled.

[0165] When the voltage of the charging pile is lower than the voltage of the battery pack, select boost charge-discharge, attract Figure 2 the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4.

[0166] When the external power source connected to the external charging and discharging port is in constant current charging and discharging mode, the electric drive system adopts voltage and current double closed loop control, and the required voltage value Un1* and the actual Un1 (Un1 is obtained by sampling the voltage on the capacitor C2) current value closed loop control obtains the required current command In*. The required current value in1* and the actual current value in1 (obtained by sampling the current ia1, ib1, ic1, in1 = -ia1-ib1-ic1) are added and controlled by PID closed loop control to obtain the required control voltage Un_1 (common mode voltage value), and the control voltage value of each phase bridge arm is equal to the common mode voltage Un_1. Through the modulation of the control voltage value of each phase bridge arm and the bus voltage and carrier, the PWM duty cycle of each phase bridge arm in each phase is obtained, and through the modulation of the bridge arm, the required motor current value of each phase is obtained.

[0167] When the external power source connected to the external charging and discharging port is in constant current charging and discharging mode, the electric drive system can also adopt single voltage upper closed loop control: in the voltage closed loop link, the required charging port voltage command Unx* is obtained by the instruction calculation module, and the required voltage value Unx* and the actual Unx (Un1 is obtained by sampling the voltage on the capacitor C2, and Un2 is obtained by sampling the voltage on the capacitor C12) current value closed loop control obtains the required control voltage Un_x (common mode voltage value), and the control voltage value of each phase bridge arm is equal to the common mode voltage Un_x. Through the modulation of the control voltage value of each phase bridge arm and the bus voltage and carrier, the PWM common mode duty cycle Dp_x of each phase bridge arm in the xth set of d-q coordinate system is obtained, and through the modulation of the bridge arm, the required motor current value of each phase is obtained. In this embodiment, the first motor d-q coordinate control system is used for voltage boosting and charging, and x=1.

[0168] The actual N-line current is calculated by in1 = -ia1-ib1-ic1 to obtain the N-line current in1, which is used for current monitoring and protection.

[0169] When the external power source connected to the external charging and discharging port is in constant voltage charging and discharging mode, the motor controller adopts single current upper closed loop control: the current command In* is directly given by the instruction calculation module, and there is no voltage closed loop link.

[0170] ③ Torque control:

[0171] The d-q coordinate control system of each motor obtains a target torque for control, finds target id_x* and iq_x* (MTPA&MTPV curves can be calculated and bench calibrated in advance, and the target current instructions id_x* and iq_x* are generally obtained by voltage, torque, and speed using a lookup table or linear fitting method) according to the target torque instruction, motor speed value, and battery bus voltage, and obtains target id_x* and iq_x* after the solving process. The current vector on the dq axis is closed-loop controlled according to the vector control method of the motor. The sampled p_x phase current values i1_x, i2_x,..., ip_x are converted to iα_x and iβ_x on the αβ coordinate system through Clark coordinate transformation, and are converted to the direct-axis current id_x and the quadrature-axis current iq_x on the dq coordinate system through Park coordinate transformation. After the difference between the current given target value id_x* and id_x, the Ud_x target value is output through PID control. After the difference between the current given target value iq_x* and iq_x, the Uq_x target value is output through PID control. Ud_x and Uq_x are converted to Uα_x and Uβ_x through inverse Park transformation, and Uα_x and Uβ_x are converted to U1_x, U2_x,..., Up_x through inverse Clark transformation. The control voltage values of the bridge arms are modulated with the bus voltage and the carrier to obtain the p_x phase bridge arm PWM differential mode duty cycles DD1_x, DD2_x,..., DDp_x. Here, p refers to the number of phases of the motor, x=1 refers to the first motor d-q coordinate control system, and x=2 refers to the second motor d-q coordinate control system. Figure 2 The dual-motor control system has two motors, each of which is three-phase. Here, p=1, 2, 3 for each system, A1 phase differential mode duty cycle DD1_1, B1 phase differential mode duty cycle DD2_1, C1 phase differential mode duty cycle DD3_1, A2 phase differential mode duty cycle DD1_2, B2 phase differential mode duty cycle DD2_2, and C2 phase differential mode duty cycle DD3_2.

[0172] Function implementation introduction:

[0173] Whether it is self-heating or boost charging, it is realized by controlling the common-mode voltage to achieve the corresponding function; the running function is controlled by the differential mode voltage of the bridge arm, the common-mode voltage and the differential mode voltage are added to obtain the control voltage of each phase bridge arm, the output duty cycle is modulated by the bridge arm, and each function is independently controlled to achieve the corresponding function.

[0174] Parking condition + DC boost charging / drop discharging: according to the process of ②, the common mode duty cycle Dp_1 of the first motor d-q coordinate control system is obtained, and the actual A1B1C1 three-phase bridge arm duty cycles D1_1, D2_1, D3_1 are obtained, wherein D1_1=D2_1=D3_1=Dp_1, and the DC boost charging / drop discharging control of the first motor d-q coordinate control system is performed;

[0175] Parking condition + DC boost charging / drop discharging + self-heating: according to the processes of ① and ②, the common mode duty cycle Dp_1 of the first motor d-q coordinate control system is obtained, and the actual A1B1C1 three-phase bridge arm duty cycles D1_1, D2_1, D3_1 are obtained, wherein D1_1=D2_1=D3_1=Dp_1, and the DC boost charging / drop discharging control is performed; the common mode duty cycle Dp_2 of the second motor d-q coordinate control system is obtained, and the actual A2B2C2 three-phase bridge arm duty cycles D1_2, D2_2, D3_2 are obtained, wherein D1_2=D2_2=D3_2=Dp_2, and the self-heating control is performed; the phase bridge arm duty cycles of the two three-phase motor systems are obtained to perform current control, and the boost charging function of the first motor d-q coordinate system and the self-heating function of the second motor d-q coordinate system are realized.

[0176] Parking condition + self-heating: according to the common mode duty cycle Dp_2 of the second motor d-q coordinate control system, the actual A2B2C2 three-phase bridge arm duty cycles D1_2, D2_2, D3_2 are obtained, wherein D1_2=D2_2=D3_2=Dp_2; the self-heating function of the second motor d-q coordinate system is realized.

[0177] Driving condition + DC boost charging / drop discharging + self-heating: according to the processes of ①, ② and ③, the actual A1B1C1 three-phase bridge arm duty cycles D1_1, D2_1, D3_1 are obtained by adding the common mode duty cycle Dp_1 of the first motor d-q coordinate control system and the differential mode duty cycles DD1_1, DD2_1, DD3_1, and the driving + DC boost charging / drop discharging control is performed; the actual A2B2C2 three-phase bridge arm duty cycles D1_2, D2_2, D3_2 are obtained by adding the common mode duty cycle Dp_2 of the second motor d-q coordinate control system and the differential mode duty cycles DD1_2, DD2_2, DD3_2, and the driving + self-heating control is performed; the phase bridge arm duty cycles of the two three-phase motors are obtained to perform current control, and the driving + boost charging function of the first motor d-q coordinate system and the driving + self-heating function of the second motor d-q coordinate system are realized.

[0178] Driving operation + DC boost charging / drop discharging: according to the processes of ② and ③, the common-mode duty cycle Dp_1 of the first motor d-q coordinate control system is added to the differential-mode duty cycles DD1_1, DD2_1 and DD3_1 respectively to obtain the actual A1B1C1 three-phase bridge arm duty cycles D1_1, D2_1 and D3_1 for driving operation + DC boost charging / drop discharging control; the common-mode duty cycle Dp_2 of the second motor d-q coordinate control system is added to the differential-mode duty cycles DD1_2, DD2_2 and DD3_2 respectively to obtain the actual A2B2C2 three-phase bridge arm duty cycles D1_2, D2_2 and D3_2 for driving operation control; the phase bridge arm duty cycles of the two three-phase motors are obtained for current control, and the driving operation + DC boost charging / drop discharging control function of the first motor d-q coordinate system and the driving operation control function of the second motor d-q coordinate system are realized.

[0179] Driving operation + self-heating: according to the processes of ① and ③, the actual A1B1C1 three-phase bridge arm duty cycles D1_1, D2_1 and D3_1 of the first motor d-q coordinate control system are obtained from the differential-mode duty cycles DD1_1, DD2_1 and DD3_1 for driving operation control; the common-mode duty cycle Dp_2 of the second motor d-q coordinate control system is added to the differential-mode duty cycles DD1_2, DD2_2 and DD3_2 respectively to obtain the actual A2B2C2 three-phase bridge arm duty cycles D1_2, D2_2 and D3_2 for driving operation + self-heating control; the phase bridge arm duty cycles of the two three-phase motors are obtained for current control, and the driving operation control function of the first motor d-q coordinate system and the driving operation + self-heating control function of the second motor d-q coordinate system are realized.

[0180] Among them, no matter driving or parking process, the preferred scheme of boost charging and self-heating function.

[0181] Further, in order to ensure that the bus current, N1 and N2 current ripple is minimum control can be used between each phase of ABC winding the1 phase shift, between each phase of UVW winding the2 phase shift, so that the ABC winding and UVW winding each set are respectively uniformly shifted by a certain angle the3, (the1, the2, the3 ∈ (0, 360)) wherein the1 = 120 degrees electrical angle, the2 = 120 degrees electrical angle, the3 = 60 degrees electrical angle. Assuming that the first motor is p1 phase, and the second motor is p2 phase, the1 = 360 / p1 degrees electrical angle, the2 = 360 / p2 degrees electrical angle, the3 = 360 / (p1+p2) degrees electrical angle can be selected.

[0182] In another exemplary embodiment, a vehicle is also provided, comprising the battery control system provided by the embodiments of the present disclosure.

[0183] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0184] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure.

[0185] In addition, any combination of various different embodiments of the present disclosure can also be made, as long as it does not deviate from the idea of the present disclosure, and it should also be considered as disclosed by the present disclosure.

Claims

1. A battery control system, characterized by, The application relates to a battery control system. The battery control system comprises: a charging and discharging port; a power battery pack comprising a first battery group and a second battery group connected in series; a first electric drive circuit, a first end of the first electric drive circuit being connected with the power battery pack, and a second end of the first electric drive circuit being connected with the charging and discharging port; a second electric drive circuit, a first end of the second electric drive circuit being connected with the power battery pack, and a second end of the second electric drive circuit being connected between the first battery group and the second battery group; the power battery pack, the first electric drive circuit and the charging and discharging port can form a boost charging loop; the power battery pack and the second electric drive circuit can form a self-heating loop; an inductor, a first bus end of the first electric drive circuit and a first bus end of the second electric drive circuit being connected through the inductor; the battery control system further comprises: a charging and discharging on-off switch unit configured to make the boost charging loop conductive or disconnected; a self-heating on-off switch unit configured to make the self-heating loop conductive or disconnected; a controller connected with a first inverter in the first electric drive circuit, a second inverter in the second electric drive circuit, the charging and discharging on-off switch unit and the self-heating on-off switch unit respectively; the controller is configured to control the first inverter, the second inverter, the charging and discharging on-off switch unit and the self-heating on-off switch unit, so that at least one of the charging / discharging function, the self-heating function and the driving function is realized; the controller is configured to:

2. The battery control system of claim 1, wherein, when in a first state, control the first inverter and the charging and discharging on-off switch unit, so that the electric energy output by the power battery pack is transmitted to the charging and discharging port to supply power to a load; and control the second inverter and the self-heating on-off switch unit, so that the first battery group and the second battery group are alternately charged and discharged to heat the power battery pack, wherein the first state is the cooperation of the discharging function and the self-heating function. The first electric drive circuit comprises: a first inverter, a first bus end of the first inverter being connected with a positive electrode of the first battery group, and a second bus end of the first inverter being connected between a negative electrode of the second battery group and a negative electrode of the charging and discharging port; 3. The battery control system of claim 2, wherein, a first motor, a winding of the first motor comprising a plurality of first pairs of poles, each of the first pairs of poles comprising three coil branches, first ends of the coil branches of the same phase of the plurality of first pairs of poles being connected in common and being connected with the bridge arm midpoints of the first inverter one by one, second ends of the coil branches of the plurality of first pairs of poles being connected in common to form a neutral point, part or all of the neutral points of the winding of the first motor being connected in common and leading out a first N line, and the first N line being connected with a positive electrode of the charging and discharging port. The second electric drive circuit comprises: a second inverter, a first bus end of the second inverter being connected with a positive electrode of the first battery group, and a second bus end of the second inverter being connected with a negative electrode of the second battery group. A second motor, windings of the second motor comprising a plurality of second pairs of poles, each of the second pairs of poles comprising three coil branches, first ends of the same phase coil branches of the three coil branches of the plurality of second pairs of poles being connected in common and connected to the bridge arm midpoints of the second inverter one by one, second ends of the three coil branches of the plurality of second pairs of poles being connected in common to form a neutral point, part or all of the neutral points of the windings of the second motor being connected in common and leading to a second N line, the second N line being connected between the first battery pack and the second battery pack.

4. The battery control system of claim 1, wherein, The controller is configured to: when in the second state, control the first inverter and the charge-discharge on-off switch unit, so that the electric energy input through the charge-discharge port is output to the power battery pack to charge the power battery pack; and control the second inverter and the self-heating on-off switch unit, so that the first battery pack and the second battery pack are alternately charged and discharged to heat the power battery pack.

5. The battery control system according to claim 1 or 4, characterized by, The controller is configured to: by controlling the first inverter, so that the electric energy of the power battery pack is output to the first motor in the first electric drive circuit to drive the vehicle, and / or by controlling the second inverter, so that the electric energy of the power battery pack is output to the second motor in the second electric drive circuit to drive the vehicle.

6. The battery control system of claim 1, wherein, The controller is configured to: control the phases of the bridge arm groups of the first inverter and the bridge arm groups of the second inverter to be the same, and control the phases of any two-phase bridge arms in the bridge arm group of the first inverter to be staggered, and control the phases of any two-phase bridge arms in the bridge arm group of the second inverter to be staggered.

7. The battery control system of claim 1, wherein, The controller is configured to: control the phases of the bridge arm groups of the first inverter and the bridge arm groups of the second inverter to be staggered, and control the phases of all the bridge arms in the bridge arm group of the first inverter to be the same, and control the phases of all the bridge arms in the bridge arm group of the second inverter to be the same.

8. The battery control system of claim 1, wherein, The controller is configured to: control the phases of the bridge arm groups of the first inverter and the bridge arm groups of the second inverter to be staggered, and control the phases of any two-phase bridge arms in the bridge arm group of the first inverter to be staggered, and control the phases of any two-phase bridge arms in the bridge arm group of the second inverter to be staggered.

9. The battery control system of claim 1, wherein, The controller is configured to: control the phases of the bridge arm groups of the inverters of the first electric drive circuit and the bridge arm groups of the inverters of the second electric drive circuit to be the same, and control the phases of all the bridge arms in the bridge arm group of the inverters of the first electric drive circuit to be the same, and control the phases of all the bridge arms in the bridge arm group of the inverters of the second electric drive circuit to be the same.

10. A vehicle characterized by comprising: The battery control system according to any one of claims 1-9.

Images