Charging control circuit and vehicle

Abstract

The present disclosure relates to a charging control circuit and a vehicle, the charging control circuit comprising a power battery, the power battery comprising a first battery pack and a second battery pack; a first charging loop connected with the power battery, the first charging loop being used for boosting charging the power battery; a second charging loop, in a first state, the second charging loop being controlled to be connected with the power battery to perform full-pack charging on the power battery; in a second state, the second charging loop being controlled to be connected with the second battery pack in the power battery to perform half-pack charging on the second battery pack. In the present disclosure, two charging loops are configured to be compatible with direct current charging piles with different capacities.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of electric vehicles, in particular, to a charging control circuit and a vehicle. BACKGROUND

[0002] At present, the energy crisis and environmental pollution problems are becoming increasingly serious, electric vehicles as a new type of transportation, can achieve "zero emissions", and electric vehicles have the advantages of simple structure, high energy utilization rate, low noise, etc. In the future development of automobiles will occupy a dominant position.

[0003] With the vigorous development of new energy vehicles, it has become a new market demand to quickly charge new energy vehicles. High-voltage, high-power charging devices provide power for the development of new energy vehicles. However, some cars cannot be well compatible with the charging device, thereby leading to poor user experience. SUMMARY

[0004] The purpose of the present disclosure is to provide a charging control circuit and a vehicle to solve the above problems existing in the related art.

[0005] In order to achieve the above purpose, the present disclosure provides a charging control circuit comprising:

[0006] a power battery, the power battery comprising a first battery pack and a second battery pack;

[0007] a first charging loop, the first charging loop being connected with the power battery, and the first charging loop being used for boosting charging the power battery;

[0008] a second charging loop, in a first state, the second charging loop is controlled to be connected with the power battery to fully charge the power battery; in a second state, the second charging loop is controlled to be connected with the second battery pack in the power battery to semi-charge the second battery pack.

[0009] Optionally, the first charging loop comprises:

[0010] a first charging port;

[0011] a first switch (K1), a first end of the first switch (K1) being connected with a positive electrode of the first charging port;

[0012] a second switch (K2), a first end of the second switch (K2) being connected with a negative electrode of the first charging port;

[0013] an electric drive system, a first end of the electric drive system being connected with a second end of the first switch (K1), a second end of the electric drive system being connected with a second end of the second switch (K2), and a third end of the electric drive system being connected with the power battery.

[0014] Optionally, the electric drive system comprises:

[0015] a motor, the motor comprising at least one phase winding, a first end of the at least one phase winding being connected in common and leading out to form an N line, the N line being connected with a second end of the first switch (K1)

[0016] a motor control unit, the motor control unit comprising a plurality of phase arms, a midpoint of each phase arm being connected with a corresponding winding; a first end of the plurality of phase arms being connected in common to form a first busbar, a second end of the plurality of phase arms being connected in common to form a second busbar;

[0017] a positive electrode of the first battery pack being connected with the first busbar, a negative electrode of the first battery pack being connected with a positive electrode of the second battery pack, a negative electrode of the second battery pack being connected with the second busbar.

[0018] Optionally, the second charging circuit comprises:

[0019] a second charging port;

[0020] a third switch (K3), a first end of the third switch (K3) being connected with a negative electrode of the second charging port, a second end of the third switch (K3) being connected with a negative electrode of the second battery pack;

[0021] a fourth switch (K4), a first end of the fourth switch (K4) being connected with a positive electrode of the second charging port;

[0022] a fifth switch (K5), a first end of the fifth switch (K5) being connected with a second end of the fourth switch (K4), a second end of the fifth switch (K5) being connected with a positive electrode of the first battery pack;

[0023] a sixth switch (K6), a first end of the sixth switch (K6) being connected with a second end of the fourth switch (K4), a second end of the sixth switch (K6) being connected with a negative electrode of the first battery pack and a positive electrode of the second battery pack respectively.

[0024] Optionally, it further comprises:

[0025] a control unit, the control unit being connected with the first switch (K1), the second switch (K2), the third switch (K3), the fourth switch (K4), the fifth switch (K5) and the sixth switch (K6) respectively;

[0026] the control unit being configured to:

[0027] When the second charging circuit is connected with the power battery, the third switch (K3), the fourth switch (K4) and the fifth switch (K5) are controlled to be in a closed state, and the remaining switches are controlled to be in an off state, so as to perform full-pack charging on the power battery;

[0028] When the second charging circuit is connected with the second battery pack in the power battery, the third switch (K3), the fourth switch (K4) and the sixth switch (K6) are controlled to be in a closed state, and the remaining switches are controlled to be in an off state, so as to perform half-pack charging on the second battery pack.

[0029] Optionally, the method further comprises:

[0030] The seventh switch (K7) has a first end connected with the N line and a second end connected with the second end of the sixth switch (K6), the negative electrode of the first battery pack and the positive electrode of the second battery pack, respectively;

[0031] The control unit is further configured to:

[0032] When the second charging circuit is connected with the second battery pack in the power battery, the third switch (K3), the fourth switch (K4) and the sixth switch (K6) are controlled to be in a closed state, and the remaining switches are controlled to be in an off state, so as to perform half-pack charging on the second battery pack, and when the battery parameter of the second battery pack meets the preset equalization condition, the seventh switch (K7) is controlled to be in a closed state, and the remaining switches are controlled to be in an off state, and at least one phase bridge arm in the multi-phase bridge arm is controlled, so as to realize that the second battery pack charges the first battery pack.

[0033] Optionally, the preset equalization condition comprises:

[0034] A preset power threshold, when the power of the second battery pack reaches the preset power threshold, it is used to represent that the battery parameter of the second battery pack meets the preset equalization condition;

[0035] Or,

[0036] A preset power difference, when the difference between the power of the first battery pack and the current power of the second battery pack is greater than the preset power difference, it is used to represent that the battery parameter of the second battery pack meets the preset equalization condition;

[0037] Or,

[0038] A preset voltage difference, when the difference between the voltage of the first battery pack and the current voltage of the second battery pack is greater than the preset voltage difference, it is used to represent that the battery parameter of the second battery pack meets the preset equalization condition.

[0039] Optionally, the control unit is further configured to:

[0040] In the third state, the second charging circuit is controlled to be connected with the power battery, so that the third switch (K3), the fourth switch (K4), the fifth switch (K5) and the seventh switch (K7) are in a closed state, and the remaining switches are controlled to be in an off state, full-pack charging is performed on the power battery, and at least one phase arm of the multi-phase bridge arm is controlled, so that the first battery pack and the second battery pack are alternately charged and discharged to realize self-heating of the power battery.

[0041] Optionally, in the fourth state, the second charging circuit is controlled to be connected with the power battery, so that the third switch (K3), the fourth switch (K4), the fifth switch (K5) and the seventh switch (K7) are in a closed state, and the remaining switches are controlled to be in an off state, full-pack charging is performed on the power battery, and at least one phase arm of the multi-phase bridge arm is controlled, so that the first battery pack and the second battery pack are alternately charged and discharged, and the voltage variation of the power battery is less than a preset voltage fluctuation threshold.

[0042] Optionally, the charging control circuit further comprises:

[0043] a pre-charging module, a first end of the pre-charging module being connected with a positive electrode of the first battery pack, and a second end of the pre-charging module being connected with the first bus bar.

[0044] In a second aspect, the present disclosure provides a vehicle comprising the charging control circuit of the first aspect.

[0045] In the above technical solution, the charging control circuit comprises a power battery, a first charging circuit and a second charging circuit, wherein the first charging circuit is connected with the power battery, and is used for performing boost charging on the power battery; in a first state, the second charging circuit is controlled to be connected with the power battery to perform full-pack charging on the power battery; and in a second state, the second charging circuit is controlled to be connected with a second battery pack in the power battery to perform half-pack charging on the second battery pack. The two charging circuits in the embodiment of the present disclosure can be compatible with direct current charging piles of different capacities, thereby improving the user experience.

[0046] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0047] 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 of the present disclosure. In the drawings:

[0048] Figure 1 is a structural block diagram of a charging control circuit according to an exemplary embodiment.

[0049] Figure 2 is a circuit block diagram of a charging control circuit according to an exemplary embodiment.

[0050] Figure 3 is a structural block diagram of an electric drive system in a charging control circuit according to an exemplary embodiment.

[0051] Figure 4 is a structural block diagram of an electric drive system in a charging control circuit according to an exemplary embodiment.

[0052] Figure 5 is a circuit block diagram of a charging control circuit according to another exemplary embodiment.

[0053] Figure 6 is a circuit block diagram of single-gun charging-main-gun boost charging in a charging control circuit according to another exemplary embodiment.

[0054] Figure 7 is a circuit block diagram of single-gun charging-secondary-gun full-pack charging in a charging control circuit according to another exemplary embodiment.

[0055] Figure 8 is a circuit block diagram of single-gun charging-secondary-gun half-pack charging in a charging control circuit according to another exemplary embodiment.

[0056] Figure 9 is a circuit block diagram of double-gun charging-main-gun boost-secondary-gun full-pack charging in a charging control circuit according to another exemplary embodiment.

[0057] Figure 10 is a circuit block diagram of double-gun charging-main-gun boost-secondary-gun half-pack charging in a charging control circuit according to another exemplary embodiment. DETAILED DESCRIPTION

[0058] The specific embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0059] It should be noted that in the present disclosure, the words "first", "second", etc. are used only for the purpose of distinguishing the described purposes, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying sequence. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0060] With the development of electric vehicles, people pay more and more attention to the endurance mileage and charging speed of electric vehicles. Before new energy storage materials and technologies are invested, double-gun charging is an effective solution to shorten the charging time. At present, there are various types of DC charging piles on the market, and the product parameters are different. Common charging piles include 500V and 750V DC piles. However, due to the different power battery technology lines of various manufacturers, there are some power batteries with rated voltage higher than 500V, which causes electric vehicles to be unable to use 500V voltage platform DC charging pile for charging, thereby affecting the user's driving experience.

[0061] Figure 1 is a structural block diagram of a charging control circuit according to an exemplary embodiment. As Figure 1 indicated, the charging control circuit 10 can include a power battery 1, a first charging loop 2 and a second charging loop 3.

[0062] In some embodiments, the power battery 1 can include a first battery pack and a second battery pack, the power battery 1 can be connected with the first charging loop 2, and the first charging loop 2 can be connected with the second charging loop 3.

[0063] The first charging loop 2 can be used for boosting charging of the power battery, that is, the first charging loop 2 can perform boosting charging for a charging pile with insufficient output capability. In addition, as Figure 1 indicated, the second charging loop 3 can be selectively connected with the power battery 1 and the first charging loop 2, and the second charging loop 3 can be used to realize semi-fully-optional charging.

[0064] Specifically, in the first state, the second charging loop 3 can be controlled to be connected with the power battery 1 to perform full-pack charging on the power battery 1.

[0065] Alternatively, in the second state, the second charging loop 3 can be controlled to be connected with the second battery pack in the power battery 1 to perform semi-pack charging on the second battery pack.

[0066] As Figure 2 indicated, the first charging loop 2 can include a first charging port 21, a first switch K1, a second switch K2 and an electric drive system 22. The positive electrode of the first charging port 21 can be connected with the first end of the first switch K1, and the negative electrode of the first charging port 21 can be connected with the first end of the second switch K2. In addition, the second end of the first switch K1 can be connected with the first end of the electric drive system 22, and the second end of the electric drive system 22 can be connected with the second end of the second switch K2. Optionally, the third end of the electric drive system 22 can be connected with the power battery 1.

[0067] In the embodiment of the present disclosure, the electric drive system 22 can includeFigure 3 The motor 221 and motor control unit 222 shown are as follows: Figure 3 As shown, the motor 221 includes at least one phase winding, and the first end of the at least one phase winding is connected and led out to form an N-line. The N-line can be connected to the second end of the first switch K1.

[0068] Here, the motor control unit 222 may include multi-phase bridge arms, and the midpoint of each phase bridge arm may be connected to the corresponding winding. Furthermore, the first ends of the multi-phase bridge arms can be connected together to form a first bus terminal, and the second ends of the multi-phase bridge arms can be connected together to form a second bus terminal. The first bus terminal may be connected to the positive terminal of the power battery 1, and the second bus terminal may be connected to the negative terminal of the power battery 1.

[0069] As a specific implementation method, such as Figure 3 The motor 221 shown may include a three-phase winding, the first ends of which are connected together and can be led out with three wires, which can be connected to the second end of the first switch K1. Meanwhile, the motor control unit 222 may include three-phase bridge arms, the midpoint of each bridge arm being connected to the corresponding winding; the first ends of the three-phase bridge arms connected together can form a first bus terminal, and the second ends of the three-phase bridge arms connected together can form a second bus terminal. The first bus terminal formed by the three-phase bridge arms can be connected to the positive terminal of the power battery 1, and the second bus terminal formed by the three-phase bridge arms can be connected to the negative terminal of the power battery 1.

[0070] As another specific implementation method, such as Figure 4 The motor 221 shown may include an inductor, the first end of which can be connected to the second end of the first switch K1, meaning a separate inductor can replace the motor coil. Meanwhile, the motor control unit 222 may include a separate upper and lower IGBT module, the midpoint of which can be connected to the second end of the inductor. Furthermore, the upper arm of this upper and lower IGBT module can be connected to the positive terminal of the power battery 1, and the lower arm of the upper and lower IGBT (Insulated Gate Bipolar Transistor) module can be connected to the negative terminal of the power battery 1.

[0071] Alternatively, the power battery 1 in this embodiment may include a first battery pack and a second battery pack. The first battery pack may be... Figure 3 or Figure 4 Package 1, the second battery pack can be Figure 3 or Figure 4 Package 2 in the middle. (Through) Figure 3 or Figure 4It can be known that the positive pole of the first battery pack can be connected with the first bus end of the motor control unit 222, and the negative pole of the first battery pack can be connected with the positive pole of the second battery pack. In addition, the negative pole of the second battery pack can be connected with the second bus end of the motor control unit 222.

[0072] In the embodiment of the present disclosure, the second charging circuit 3 can include Figure 3 the second charging port 31, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 in the second charging circuit 3. Wherein, the negative pole of the second charging port 31 can be connected with the first end of the third switch K3, and the positive pole of the second charging port 31 can be connected with the first end of the fourth switch K4. In addition, the second end of the third switch K3 can be connected with the negative pole of the second battery pack, and the second end of the fourth switch K4 can be connected with the first end of the fifth switch K5, and the second end of the fifth switch K5 can be connected with the positive pole of the first battery pack.

[0073] Here, the first end of the sixth switch K6 can be connected with the second end of the fourth switch K4, and the second end of the sixth switch K6 can be connected with the negative pole of the first battery pack and the positive pole of the second battery pack respectively.

[0074] It should be noted that the first charging circuit 2 in the embodiment of the present disclosure is called the main charging circuit, and the second charging circuit 3 can be called the auxiliary charging circuit.

[0075] In the embodiment of the present disclosure, the charging control circuit can include a power battery, a first charging circuit and a second charging circuit, wherein the first charging circuit is connected with the power battery, and the first charging circuit is used for boosting charging the power battery; in the first state, the second charging circuit is controlled to be connected with the power battery, so as to perform full-pack charging on the power battery; in the second state, the second charging circuit is controlled to be connected with the second battery pack in the power battery, so as to perform half-pack charging on the second battery pack. The two charging circuits in the embodiment of the present disclosure can be compatible with different capacity direct current charging piles, so as to improve the user experience.

[0076] Figure 5 is a structural block diagram of a charging control circuit according to another exemplary embodiment. As Figure 5 shown, the charging control circuit 10 can further include a control unit 4.

[0077] In the embodiment of the present disclosure, the control unit 4 can be connected with the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 respectively.

[0078] In some embodiments, the control unit 4 can be configured to control the third switch K3, the fourth switch K4 and the fifth switch K5 to be in the closed state, and control the remaining switches to be in the off state, when the second charging circuit 3 is connected with the power battery 1, so as to realize full-pack charging of the power battery.

[0079] Optionally, when the second charging circuit 3 is connected with the second battery pack in the power battery, the control unit 4 can control the third switch K3, the fourth switch K4 and the sixth switch K6 to be in the closed state, and control the remaining switches to be in the off state, so as to realize half-pack charging of the second battery pack.

[0080] Optionally, the charging control circuit can further include an eighth switch K9 and a ninth switch K10 as shown in Figure 6 , wherein the first end of the eighth switch K9 can be connected with the second end of the fifth switch K5, and the second end of the eighth switch K9 can be connected with the positive electrode of the first battery pack. In addition, the first end of the ninth switch K10 can be connected with the negative electrode of the second battery pack, and the second end of the ninth switch K10 can be connected with the second end of the third switch K3.

[0081] In some embodiments, when it is identified that the first charging port 21 is connected with the direct-current charging pile and starts pile charging, and the second charging port 31 is not inserted with a gun or the inserted gun does not start pile charging, the control unit 4 can control each switch to enter the main charging circuit charging process, and the corresponding mode of the charging process can be the boost charging mode.

[0082] As shown in Figure 6 , in the boost charging mode, the control unit 4 can use the electric drive system 22 as a boost and buck module to increase the output voltage of the charging port. Specifically, the control unit 4 can control the first switch K1, the second switch K2, the eighth switch K9 and the ninth switch K10 to be in the off state, and control the multi-phase bridge arm, so that the power battery is subjected to boost full-pack charging. At this time, the charging mode can also be referred to as single-gun charging-main-gun boost charging.

[0083] It should be noted that the multi-phase bridge arm in the present embodiment can control a single-phase bridge arm or a multi-phase bridge arm.

[0084] Optionally, when it is identified that the second charging port 31 is connected with the direct-current charging pile and starts pile charging, and the first charging port 21 is not inserted with a gun or the inserted gun does not start pile charging, the control unit 4 can control each switch to enter the auxiliary charging circuit charging process. When charging is performed by using the second charging circuit 3, the control unit 4 can determine whether to perform full-pack charging or half-pack charging according to the output capability of the pile.

[0085] Specifically, if it is detected that the output capability of the pile meets the requirement of the whole-pack charging, the control unit 4 can control the switches to enter the auxiliary charging circuit whole-pack charging process, that is, the control unit 4 can be configured to: in the whole-pack charging mode, control the third switch K3, the fourth switch K4 and the fifth switch K5 to be in the closed state, so as to perform the whole-pack charging on the power battery 1.

[0086] In addition, if the charging control circuit further includes the eighth switch K9 and the ninth switch K10, the control unit 4 can also control the eighth switch K9 and the ninth switch K10 to be in the closed state, so as to realize the auxiliary charging circuit whole-pack charging. At this time, the charging mode can also be called single-gun charging-auxiliary-gun whole-pack charging, and the charging process can be as shown in FIG. 6. Figure 7

[0087] Optionally, if it is detected that the output capability of the pile cannot meet the requirement of the whole-pack charging, the control unit 4 can control the switches to enter the auxiliary charging circuit half-pack charging process, that is, the control unit 4 can be configured to: in the half-pack charging mode, control the third switch K3, the fourth switch K4 and the sixth switch K6 to be in the closed state, so as to perform the half-pack charging on the power battery 1, that is, only the second battery pack is charged.

[0088] It should be noted that the embodiments of the present disclosure can also perform the half-pack charging on the first battery pack according to the requirement, and only the topology of FIG. 5 needs to be modified. Figure 7

[0089] In addition, if the charging control circuit further includes the eighth switch K9 and the ninth switch K10, the control unit 4 can also control the eighth switch K9 and the ninth switch K10 to be in the closed state, so as to realize the auxiliary charging circuit half-pack charging. At this time, the charging mode can also be called single-gun charging-auxiliary-gun half-pack charging, and the charging process can be as shown in FIG. 7. Figure 8

[0090] In some embodiments, the second charging circuit 3 can further include a seventh switch K7, wherein a first end of the seventh switch K7 can be connected with the first end of at least one phase winding and the second end of the first switch K1 respectively, and a N line formed by leading out. In addition, the second end of the seventh switch K7 can be connected with the second end of the sixth switch K6, the negative electrode of the first battery pack and the positive electrode of the second battery pack respectively.

[0091] ​​​At this time, when the second charging circuit 3 is connected with the second battery pack in the power battery 1, the third switch K3, the fourth switch K4 and the sixth switch K6 are controlled to be in the closed state, and the remaining switches are controlled to be in the off state, so as to perform the semi-pack charging on the second battery pack, and when the battery parameters of the second battery pack meet the preset equalization condition, the seventh switch K7 is controlled to be in the closed state, and the remaining switches are controlled to be in the off state, and at least one phase bridge arm in the multi-phase bridge arm is controlled, so as to realize that the second battery pack charges the first battery pack.

[0092] In the embodiments of the present disclosure, the preset equalization condition can include: a preset power threshold, the power of the second battery pack reaching the preset power threshold, used to represent that the battery parameters of the second battery pack meet the preset equalization condition; or, a preset power difference, the difference between the power of the first battery pack and the current power of the second battery pack being greater than the preset power difference, used to represent that the battery parameters of the second battery pack meet the preset equalization condition; or, a preset voltage difference, the difference between the voltage of the first battery pack and the current voltage of the second battery pack being greater than the preset voltage difference, used to represent that the battery parameters of the second battery pack meet the preset equalization condition.

[0093] In other embodiments, when it is identified that the first charging port 21 and the second charging port 31 are both connected with the direct-current charging pile and the pile charging is started, and the output capacity of the charging pile connected with the second charging port 31 meets the requirement of the whole-pack charging, the control unit 4 can control each switch to enter the main gun boosting auxiliary gun whole-pack charging mode, which can also be called double-gun charging-main gun boosting auxiliary gun whole-pack charging.

[0094] Specifically, the control unit 4 can control the first switch K1, the second switch K2, the eighth switch K9 and the ninth switch K10 to be in the off state, and control the multi-phase bridge arm to realize the main gun boosting charging. At the same time, the control unit 4 can control the third switch K3, the fourth switch K4 and the fifth switch K5 to be in the closed state, so as to realize the auxiliary gun whole-pack charging. The specific charging circuit is shown in Figure 9 .

[0095] In this process, the control unit 4 controls the two groups of independent first charging circuit 2 and second charging circuit 3 to perform CAN (Controller Area Network) signal interaction with the charging pile, so as to realize the fastest charging purpose.

[0096] In addition, when it is identified that the first charging port 21 and the second charging port 31 are both connected with the direct-current charging pile and the pile charging is started, and the output capacity of the charging pile connected with the second charging port 31 does not meet the requirement of the whole-pack charging, the control unit 4 can control each switch to enter the main gun boosting auxiliary gun semi-pack charging mode, which can also be called double-gun charging-main gun boosting auxiliary gun semi-pack charging.

[0097] Specifically, the control unit 4 can control the first switch K1, the second switch K2, the eighth switch K9 and the ninth switch K10 to be in the closed state, and control the multiphase bridge arm to realize the main gun voltage boost charging. At the same time, the control unit 4 can control the third switch K3, the fourth switch K4 and the sixth switch K6 to be in the closed state to realize the auxiliary gun half-pack charging, and the specific charging circuit is as shown in Figure 10

[0098] In a specific embodiment, if it is determined that the current difference between the first battery pack and the second battery pack reaches a preset threshold, the control unit 4 can control the seventh switch K7 to be in the closed state, and the multiplex electric drive system 22 balances the voltage of the second battery pack to the first battery pack to realize the balance control of the battery circuit.

[0099] As an optional way, the control unit 4 can be configured to control the first switch K1, the second switch K2, the eighth switch K9 and the ninth switch K10 to be in the closed state in the voltage boost charging mode, and control the multiphase bridge arm to actuate the power battery 1 to perform voltage boost full-pack charging. In addition, in the direct connection half-pack charging mode, the control unit 4 can control the third switch K3, the fourth switch K4, the sixth switch K6 and the ninth switch K10 to be in the closed state to perform half-pack charging on the second battery pack of the power battery 1.

[0100] In addition, the charging control circuit 10 can further include a first capacitor C2 and a pre-charge module 5. The first end of the first capacitor C2 can be connected with the first end of the multiphase bridge arm to form a first bus end, and the second end of the first capacitor C2 can be connected with the first end of the multiphase bridge arm to form a second bus end. In addition, the first end of the pre-charge module 5 can be connected with the positive electrode of the first battery pack, and the second end of the pre-charge module 5 can be connected with the first bus end.

[0101] As shown in Figure 10 The pre-charge module 5 can include a pre-charge relay K8 and a pre-charge resistor R. The first end of the pre-charge relay K8 can be connected with the first end of the eighth switch K9, the fifth switch K5, the first capacitor C2 and the first bus end respectively. In addition, the first end of the pre-charge resistor R is connected with the second end of the pre-charge relay K8, and the second end of the pre-charge resistor R can be connected with the first battery pack and the second end of the eighth switch K9 respectively. By adding the pre-charge module 5, the sintering of the eighth switch K9 can be prevented.

[0102] In addition, the charging control circuit 10 can further include a second capacitor C1. The first end of the second capacitor C1 can be connected with the second end of the first switch K1, the first end of the seventh switch K7 and the N line respectively, and the second end of the second capacitor C1 can be connected with the second end of the second switch K2 and the second end of the multiphase bridge arm to form a second bus end.

[0103] ​In some other embodiments, the control unit 4 can be further configured to, in the third state, control the second charging circuit 3 to be connected with the power battery 1, so that the third switch K3, the fourth switch K4, the fifth switch K5 and the seventh switch K7 are in a closed state, and the rest of the switches are in an off state, to perform full-pack charging on the power battery 1, and control at least one phase arm of the multi-phase bridge arm, so that the first battery pack and the second battery pack are alternately charged and discharged to realize self-heating of the power battery.

[0104] In some other embodiments, the control unit is further configured to, in the fourth state, control the second charging circuit to be connected with the power battery, so that the third switch K3, the fourth switch K4, the fifth switch K5 and the seventh switch K7 are in a closed state, and the rest of the switches are in an off state, to perform full-pack charging on the power battery 1, and control at least one phase arm of the multi-phase bridge arm, so that the first battery pack and the second battery pack are alternately charged and discharged, and the voltage variation across the power battery 1 is less than a preset voltage fluctuation threshold.

[0105] The charging control circuit in the embodiments of the present disclosure can include a power battery, a first charging circuit and a second charging circuit, wherein the first charging circuit is connected with the power battery, and the first charging circuit is used to perform boost charging on a charging pile with insufficient output capacity; the second charging circuit is connected with the power battery and the first charging circuit respectively, and the second charging circuit is used to realize semi-pack and full-pack optional charging. The two charging circuits in the embodiments of the present disclosure can be compatible with direct-current charging piles with different capacities, thereby improving the use experience of users. In addition, the control unit in the embodiments of the present disclosure can more flexibly and effectively realize charging of the battery, and the addition of the pre-charging module can not only prevent sintering of the switches, but also further improve the use experience of users.

[0106] In addition, the present disclosure also provides a vehicle including the above charging control circuit.

[0107] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above 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.

[0108] In addition, it should be noted that various specific technical features 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.

[0109] 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 in the present disclosure.

Claims

1. A charge control circuit, characterized by comprising: It comprises: a power battery, the power battery comprising a first battery pack and a second battery pack; a first charging circuit connected with the power battery, the first charging circuit being used for boosting charging the power battery, the first charging circuit comprising a first charging port, a first switch (K1), a second switch (K2) and an electric drive system, the electric drive system comprising a motor and a motor control unit, the motor control unit comprising multi-phase bridge arms, and a midpoint of each phase bridge arm being connected with a corresponding winding; a second charging circuit, in a first state, the second charging circuit being controlled to be connected with the power battery to perform full-pack charging on the power battery; in a second state, the second charging circuit being controlled to be connected with the second battery pack in the power battery to perform half-pack charging on the second battery pack, the second charging circuit comprising a second charging port, a third switch (K3), a fourth switch (K4), a fifth switch (K5), a sixth switch (K6) and a seventh switch (K7), a first end of the seventh switch (K7) being connected with the electric drive system and a second end of the first switch (K1) respectively, a second end of the seventh switch (K7) being connected with a second end of the sixth switch (K6), a negative electrode of the first battery pack and a positive electrode of the second battery pack respectively; a control unit connected with the first switch (K1), the second switch (K2), the third switch (K3), the fourth switch (K4), the fifth switch (K5), the sixth switch (K6) and the seventh switch (K7) respectively; the control unit being configured to: when the second charging circuit is connected with the second battery pack in the power battery, controlling the third switch (K3), the fourth switch (K4) and the sixth switch (K6) to be in a closed state, and controlling the remaining switches to be in an off state, to perform half-pack charging on the second battery pack, and when a battery parameter of the second battery pack meets a preset equalization condition, controlling the seventh switch (K7) to be in a closed state, and controlling the remaining switches to be in an off state, and controlling at least one phase bridge arm in the multi-phase bridge arms, to realize the second battery pack charging the first battery pack.

2. The circuit according to claim 1, wherein: a first end of the first switch (K1) is connected with a positive electrode of the first charging port; a first end of the second switch (K2) is connected with a negative electrode of the first charging port; a first end of the electric drive system is connected with a second end of the first switch (K1), a second end of the electric drive system is connected with a second end of the second switch (K2), and a third end of the electric drive system is connected with the power battery.

3. The circuit according to claim 2, wherein: the motor comprises at least one phase winding, a first end of the at least one phase winding is commonly connected and led out to form an N line, and the N line is connected with the second end of the first switch (K1). The first ends of the multi-phase bridge arms are connected to form a first bus end, the second ends of the multi-phase bridge arms are connected to form a second bus end, the positive electrode of the first battery pack is connected to the first bus end, the negative electrode of the first battery pack is connected to the positive electrode of the second battery pack, and the negative electrode of the second battery pack is connected to the second bus end.

4. The circuit of claim 3, wherein, a first end of the third switch (K3) is connected to the negative electrode of the second charging port, and a second end of the third switch (K3) is connected to the negative electrode of the second battery pack; a first end of the fourth switch (K4) is connected to the positive electrode of the second charging port; a first end of the fifth switch (K5) is connected to a second end of the fourth switch (K4), and a second end of the fifth switch (K5) is connected to the positive electrode of the first battery pack; a first end of the sixth switch (K6) is connected to the second end of the fourth switch (K4), and a second end of the sixth switch (K6) is connected to the negative electrode of the first battery pack and the positive electrode of the second battery pack, respectively.

5. The circuit of claim 1, wherein, The control unit is further configured to: when the second charging circuit is connected to the power battery, control the third switch (K3), the fourth switch (K4), and the fifth switch (K5) to be in a closed state, and control the remaining switches to be in an off state, to perform full-pack charging on the power battery; when the second charging circuit is connected to the second battery pack in the power battery, control the third switch (K3), the fourth switch (K4), and the sixth switch (K6) to be in a closed state, and control the remaining switches to be in an off state, to perform half-pack charging on the second battery pack.

6. The circuit of claim 1, wherein, The preset equalization condition includes: a preset power threshold, the power of the second battery pack reaching the preset power threshold, for representing that the battery parameter of the second battery pack meets the preset equalization condition; or, a preset power difference, the difference between the power of the first battery pack and the current power of the second battery pack being greater than the preset power difference, for representing that the battery parameter of the second battery pack meets the preset equalization condition; or, a preset voltage difference, the difference between the voltage of the first battery pack and the current voltage of the second battery pack being greater than the preset voltage difference, for representing that the battery parameter of the second battery pack meets the preset equalization condition.

7. The circuit of claim 1, wherein, The control unit is further configured to: in the third state, control the second charging circuit to be connected to the power battery, so that the third switch (K3), the fourth switch (K4), the fifth switch (K5), and the seventh switch (K7) are in a closed state, and control the remaining switches to be in an off state, to perform full-pack charging on the power battery, and control at least one phase bridge arm in the multi-phase bridge arm, so that the first battery pack and the second battery pack are alternately charged and discharged, to realize self-heating of the power battery.

8. The circuit of claim 1, wherein, The control unit is further configured to: In the fourth state, the second charging circuit is connected with the power battery, so that the third switch (K3), the fourth switch (K4), the fifth switch (K5) and the seventh switch (K7) are in the closed state, and the remaining switches are controlled to be in the off state, the power battery is fully charged, and at least one phase arm in the multi-phase bridge arm is controlled, so that the first battery pack and the second battery pack are alternately charged and discharged, and the voltage variation of the power battery is less than a preset voltage fluctuation threshold.

9. The circuit of claim 3, wherein, It also includes: A pre-charging module, a first end of the pre-charging module is connected with the positive electrode of the first battery pack, and a second end of the pre-charging module is connected with the first bus end.

10. A vehicle characterized by comprising: The charging control circuit includes any one of claims 1-9.

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