Charging system and vehicle

Abstract

A charging system and a vehicle, relating to the technical field of vehicles. The charging system comprises: at least one charging port; a charging module connected between the charging port and a power battery (6) and comprising a direct charging circuit, a boost charging circuit and a buck charging circuit which are connected to the power battery; and a control module connected to the charging module, wherein the control module is configured to, in response to an output voltage of a charging pile currently connected to the charging port, turn on a target circuit corresponding to the output voltage among the direct charging circuit, the boost charging circuit and the buck charging circuit so as to charge the power battery.

Description

Charging system and vehicle

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 202510116537.2, filed on January 23, 2025, entitled “Charging System and Vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of vehicle technology, specifically relating to a charging system and a vehicle. Background Technology

[0004] With the increasing number of new energy vehicles on the road, the voltage range of power batteries for different models is becoming wider, and the power required for charging is also varying. However, the output capabilities of charging piles from different manufacturers differ, resulting in some high-voltage models being unable to charge at charging piles with low output voltage, or charging piles with high output voltage not being able to output their maximum power. Summary of the Invention

[0005] In view of the above problems, embodiments of this application provide a charging system and vehicle to overcome or at least partially solve the above problems.

[0006] According to a first aspect of this application, a charging system is provided, including: at least one charging port;

[0007] A charging module, connected between the charging port and the power battery, includes a direct-connect charging circuit, a boost charging circuit, and a buck charging circuit connected to the power battery; and

[0008] The control module is connected to the charging module;

[0009] The control module is configured to, in response to the output voltage of the charging pile currently connected to the charging port, conduct the target circuit corresponding to the output voltage in the direct charging circuit, boost charging circuit, and buck charging circuit to charge the power battery.

[0010] Furthermore, it includes multiple charging modules; wherein, the multiple charging modules correspond to multiple charging ports;

[0011] The control module is configured to, in response to the output voltage of the charging pile currently connected to multiple charging ports, conduct multiple target circuits corresponding to the output voltage in multiple charging modules to charge the power battery.

[0012] Furthermore, the control module is specifically configured as follows:

[0013] When the output voltage is equal to the first voltage, the direct charging circuit is turned on.

[0014] And when the output voltage is higher than the first voltage, control the buck charging circuit to turn on;

[0015] And when the output voltage is lower than the first voltage, control the boost charging circuit to turn on.

[0016] Furthermore, the charging system also includes a first switch group, a second switch group, and a third switch group; wherein, the first switch group is connected in series between the positive terminal of the power battery and the charging port, the second switch group is connected in series between the negative terminal of the power battery and the charging port, and the third switch group is connected in series between the charging module and the charging port.

[0017] The control module is also configured to control the state of the switches in the first switch group, the second switch group and the third switch group in response to the charging signal, so as to turn on the target circuit.

[0018] Furthermore, the charging module includes a first motor and a first inverter; wherein, the first inverter includes a first bridge arm and a second bridge arm, the first end of the first bridge arm is connected to the positive terminal of the charging port and the positive terminal of the power battery respectively, the second end of the first bridge arm is connected to the first motor and the first end of the second bridge arm respectively, and the second end of the second bridge arm is also connected to the negative terminal of the charging port and the negative terminal of the power battery.

[0019] The third switch group is connected in series between the first motor and the positive terminal of the charging port.

[0020] Furthermore, the first switch group includes a first switch and a second switch, and the second switch group includes a third switch and a fourth switch;

[0021] The first switch is connected in series between the positive terminal of the power battery and the first bridge arm; the second switch is connected in series between the first bridge arm and the positive terminal of the charging port; the third switch is connected in series between the negative terminal of the power battery and the second bridge arm; and the fourth switch is connected in series between the second bridge arm and the negative terminal of the charging port.

[0022] The control module is specifically configured to close the first switch, the second switch, the third switch and the fourth switch when the output voltage is equal to the first voltage, thereby connecting the direct-connect charging circuit.

[0023] Furthermore, the third switch group includes a fifth switch, and the first switch group also includes a sixth switch; wherein, the fifth switch is connected in series between the first motor and the positive terminal of the charging port, and the sixth switch is connected in series between the first switch and the positive terminal of the charging port;

[0024] The control module is specifically configured to alternately conduct the first circuit and the second circuit when the output voltage is higher than the first voltage. The first circuit is the circuit between the charging port, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the first bridge arm, the first motor, and the power battery. The second circuit is the circuit between the first motor, the first switch, the third switch, the fifth switch, the sixth switch, the second bridge arm, and the power battery. The first circuit and the second circuit constitute a step-down charging circuit.

[0025] With the first circuit open, the charging port charges the first motor and the power battery;

[0026] With the second circuit active, the first motor charges the power battery.

[0027] Furthermore, the control module is specifically configured to alternately conduct the third circuit and the fourth circuit when the output voltage is lower than the first voltage; wherein, the third circuit is the circuit between the first motor, the power battery, the fourth switch, the fifth switch and the second bridge arm; the fourth circuit is the circuit between the charging port, the first motor, the power battery, the first switch, the third switch, the fourth switch, the fifth switch and the first bridge arm, and the third circuit and the fourth circuit constitute a boost charging circuit;

[0028] With the third circuit active, the charging port charges the first motor;

[0029] With the fourth circuit active, the charging port and the first motor charge the power battery together.

[0030] Furthermore, the power battery includes: a first battery and a second battery connected in series, and the charging system also includes:

[0031] The balancing module, connected to the power battery, is configured to transfer a portion of the charge from the first battery to the second battery, or transfer a portion of the charge from the second battery to the first battery, when the charge difference between the first battery and the second battery exceeds a first difference value, so that the charge difference is less than or equal to the first difference value.

[0032] Furthermore, the balancing module includes: a second motor and a second inverter;

[0033] The second inverter includes a third bridge arm and a fourth bridge arm. The first end of the third bridge arm is connected to the positive terminal of the first battery. The second end of the third bridge arm is connected to the negative terminal of the first battery, the positive terminal of the second battery, and the first end of the fourth bridge arm via a second motor. The second end of the fourth bridge arm is connected to the negative terminal of the second battery.

[0034] Furthermore, the balancing module is connected to the control module. Specifically, the control module is configured to alternately activate the first balancing circuit and the second balancing circuit in the balancing module when the charge of the first battery is higher than that of the second battery. The first balancing circuit is the circuit between the first battery, the third bridge arm, and the second motor, and the second balancing circuit is the circuit between the second motor, the fourth bridge arm, and the second battery.

[0035] With the first equalization circuit in operation, the first battery charges the second motor;

[0036] With the second equalization circuit activated, the second motor charges the second battery.

[0037] Furthermore, the balancing module is connected to the control module. Specifically, the control module is configured to alternately activate the third and fourth balancing circuits when the charge of the second battery is higher than that of the first battery. The third balancing circuit connects the second battery, the fourth bridge arm, and the second motor; the fourth balancing circuit connects the second motor, the third bridge arm, and the first battery.

[0038] With the third equalization circuit in operation, the second battery charges the second motor;

[0039] With the fourth equalization circuit activated, the second motor charges the first battery.

[0040] Furthermore, the charging system also includes a pre-charge switch and a pre-charge resistor connected in series; wherein the pre-charge switch and the pre-charge resistor are also connected in parallel across the first switch;

[0041] The control module is also configured to respond to the output voltage of the charging pile currently connected to the charging port, control the pre-charge switch to close, pre-charge the capacitors at both ends of the power battery through the pre-charge resistor, disconnect the pre-charge switch after pre-charging is completed, control the first switch to close, and conduct the target circuit when the first switch is closed.

[0042] Furthermore, the charging system also includes a first capacitor; wherein the first capacitor is connected in parallel between the power battery and the charging module or equalization module.

[0043] A second aspect of this application provides a vehicle that includes the charging system provided in the first aspect of this application.

[0044] This embodiment provides a charging system, including: at least one charging port; a charging module connected between the charging port and a power battery, including a direct-connect charging circuit, a boost charging circuit, and a buck charging circuit connected to the power battery; and a control module connected to the charging module; the control module is configured to, in response to the output voltage of the charging pile currently connected to the charging port, conduct a target circuit corresponding to the output voltage in the direct-connect charging circuit, the boost charging circuit, and the buck charging circuit to charge the power battery.

[0045] Therefore, by providing at least one charging port and a charging module connected between the charging port and the power battery, the control module selects the target circuit corresponding to the output voltage from the direct charging circuit, boost charging circuit, and buck charging circuit according to the voltage output by the charging pile, so that the target circuit charges the power battery. This makes it compatible with charging piles with different voltage outputs. Whether it is a high-voltage or low-voltage charging pile, it can be charged through the corresponding circuit, which greatly improves the applicability of the charging system and solves the problems that high-voltage vehicles cannot be charged at low-voltage charging piles and low-voltage vehicles cannot fully utilize the power of high-voltage charging piles. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 is a schematic diagram of a charging system provided in an embodiment of this application;

[0048] Figure 2 is a schematic diagram of another charging system provided in an embodiment of this application;

[0049] Figure 3 is a schematic diagram of the circuit structure of a charging system provided in an embodiment of this application;

[0050] Figure 4 is a schematic diagram of the current flow direction of a direct-connected charging circuit provided in an embodiment of this application;

[0051] Figure 5 is a current flow diagram of a buck charging circuit provided in an embodiment of this application.

[0052] Figure 6 is a diagram showing the current flow direction of a buck charging circuit provided in an embodiment of this application.

[0053] Figure 7 is a current flow diagram of a boost charging circuit provided in an embodiment of this application.

[0054] Figure 8 is a diagram showing the current flow direction of a boost charging circuit according to an embodiment of this application.

[0055] Figure 9 is a schematic diagram of another charging system provided in an embodiment of this application;

[0056] Figure 10 is a schematic diagram of the current flow direction when the first equalization circuit is turned on, as provided in this application;

[0057] Figure 11 is a schematic diagram of the current flow direction when the second equalization circuit is turned on according to this application;

[0058] Reference numerals in the attached diagram: 1-DC charging port A; 2, 9-first motor; 3, 8-first inverter; 4-second inverter; 5-second motor; 6-power battery; 7-pre-charge switch and pre-charge resistor. Detailed Implementation

[0059] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0060] To address the differences in output capabilities among charging piles from different manufacturers, some manufacturers have adopted a motor boost charging solution, which is compatible with charging piles with low output voltage. However, this solution lacks a buck charging function and cannot maximize output for charging piles with high output voltage.

[0061] In view of this, in order to solve the above problems, this embodiment provides a charging system. The control module selects the target circuit corresponding to the output voltage from the direct-connect charging circuit, boost charging circuit, and buck charging circuit according to the voltage output of the charging pile, so that the target circuit charges the power battery. This makes it compatible with charging piles with different voltage outputs. Whether it is a high-voltage or low-voltage charging pile, it can be charged through the corresponding circuit, which greatly improves the applicability of the charging system and solves the problems that high-voltage vehicles cannot be charged at low-voltage charging piles and low-voltage vehicles cannot fully utilize the power of high-voltage charging piles.

[0062] Referring to Figure 1, which is a schematic diagram of a charging system provided in an embodiment of this application, the system includes: at least one charging port; a charging module connected between the charging port and a power battery, including a direct charging circuit, a boost charging circuit, and a buck charging circuit connected to the power battery; and a control module connected to the charging module. The control module is configured to, in response to the output voltage of the charging pile currently connected to the charging port, conduct a target circuit corresponding to the output voltage in the direct charging circuit, the boost charging circuit, and the buck charging circuit to charge the power battery.

[0063] In this embodiment, to facilitate charging for the driver while parked, at least one charging port can be included. Multiple charging ports can be arranged in different locations on the vehicle, such as one charging port on each of the left and right sides of the rear of the vehicle. This allows for convenient connection to a charging station regardless of whether the vehicle is parked on the left or right. In addition to the rear, a charging port can also be arranged at the front of the vehicle. This is especially useful in parking lots or charging stations where the vehicle may need to be parked with its front facing inwards. A front charging port can facilitate charging for the driver in such scenarios.

[0064] A charging module is a circuit or electronic device that, after a charging pile is inserted into the vehicle's charging port, can adjust the output voltage of the charging pile to adapt to charging the power battery. Since the charging module is connected between the charging port and the power battery and includes a direct charging circuit, a boost charging circuit, and a buck charging circuit connected to the power battery, the charging module can adjust the output voltage of the charging pile.

[0065] The control module is connected to the charging module and can activate any of the following circuits: direct charging circuit, boost charging circuit, and buck charging circuit. The control module can be the vehicle's MCU (Microcontroller Unit). It can determine whether the output voltage of the charging pile currently connected to the charging port matches the charging voltage required by the vehicle's power battery. If they match, the direct charging circuit is activated so that the charging port directly charges the power battery. If they do not match, the charging module is controlled to adjust the charging method. If the output voltage of the charging pile is less than the charging voltage required by the power battery, the boost charging circuit is activated so that the output voltage of the charging pile is boosted before charging the power battery. If the output voltage of the charging pile is greater than the charging voltage required by the power battery, the buck charging circuit is activated so that the output voltage of the charging pile is reduced before charging the power battery.

[0066] Therefore, the charging system provided in this embodiment can be adapted to charging piles with different output powers currently on the market, and can also meet the maximum output power of charging piles with different output powers.

[0067] In one specific embodiment, the system includes multiple charging modules; wherein the multiple charging modules correspond to multiple charging ports; and a control module is configured to, in response to the output voltage of a charging pile currently connected to the multiple charging ports, conduct multiple target circuits corresponding to the output voltage in the multiple charging modules to charge the power battery.

[0068] In this embodiment, to improve charging efficiency, referring to Figure 2, which is a schematic diagram of another charging system provided in this application embodiment, the charging system includes multiple charging modules, each corresponding to a charging port. The vehicle's power battery can be charged through these multiple charging ports. Specifically, the control module can compare the output voltage of the charging port with the required charging voltage of the power battery when multiple charging ports are plugged into a charging pile. If the output voltage is greater than the charging voltage, the charging modules connected to the multiple charging ports can be controlled to simultaneously reduce the voltage to charge the power battery. If the output voltage is less than the charging voltage, the charging modules connected to the multiple charging ports can be controlled to simultaneously increase the voltage to charge the power battery. If the output voltage is equal to the charging voltage, the charging modules connected to the multiple charging ports can be controlled to simultaneously charge the power battery. Therefore, by charging the power battery simultaneously through multiple charging modules, the charging efficiency of the power battery can be improved, and the charging time can be significantly reduced.

[0069] In one specific embodiment, the control module is specifically configured to: control the direct charging circuit to turn on when the output voltage is equal to the first voltage; control the buck charging circuit to turn on when the output voltage is higher than the first voltage; and control the boost charging circuit to turn on when the output voltage is lower than the first voltage.

[0070] In this embodiment, the first voltage is the charging voltage required by the power battery. The control module, based on the output voltage of the charging pile, connects the target circuit corresponding to the output voltage in the direct-connect charging circuit, boost charging circuit, and buck charging circuit. Specifically, when the output voltage equals the first voltage, it means that the output voltage of the charging pile connected to the current charging port matches the charging voltage required by the power battery, allowing direct charging of the power battery without needing to adjust the output voltage of the charging pile, thus enabling the direct-connect charging circuit to be activated.

[0071] When the output voltage of the charging pile is higher than the first voltage, it means that the high-voltage charging pile is charging the low-voltage vehicle. At this time, in order to make full use of the power of the high-voltage charging pile, the control module will turn on the step-down charging circuit, that is, to step down the output voltage and use the stepped-down voltage to charge the power battery.

[0072] When the output voltage of the charging pile is lower than the first voltage, it means that the low-voltage charging pile is charging the high-voltage vehicle. At this time, in order to solve the problem that the high-voltage vehicle cannot be charged at the low-voltage charging pile, the control module will turn on the boost charging circuit, that is, boost the output voltage and use the boosted voltage to charge the power battery.

[0073] In one specific embodiment, referring to Figure 3, which is a schematic diagram of the circuit structure of a charging system provided in an embodiment of this application; as shown in Figure 3, the charging system further includes a first switch group, a second switch group, and a third switch group; wherein, the first switch group is connected in series between the positive terminal of the power battery and the charging port, the second switch group is connected in series between the negative terminal of the power battery and the charging port, and the third switch group is connected in series between the charging module and the charging port; the control module is further configured to control the state of the switches in the first switch group, the second switch group, and the third switch group in response to the charging signal, so as to conduct the target circuit.

[0074] In this embodiment, referring to Figure 3, the charging port can be either a DC charging port A or a DC charging port B. For charging the power battery using DC charging port A, the first switch group can be K1, K8, and K10, the second switch group can be K11, and the third switch group can be K9.

[0075] For DC charging port B, the first switch group can be K1, K4, and K6; the second switch group can be K2 and K7; and the third switch group can be K5. From this point onward, all subsequent descriptions of the various current flows will use DC charging port B as an example. DC charging port A can be described with reference to DC charging port B, and will not be repeated.

[0076] The first switch group is connected in series between the positive terminal of the power battery and the charging port, the second switch group is connected in series between the negative terminal of the power battery and the charging port, and the third switch group is connected in series between the charging module and the charging port. Therefore, the control module can precisely select the target circuit to conduct by controlling the states of the first, second, and third switch groups, ensuring that current flows only through the target circuit (direct-connected charging circuit, boost charging circuit, or buck charging circuit). Furthermore, during the power battery charging process, precise control of the switch states can prevent current from flowing through incorrect paths, avoiding circuit damage or low charging efficiency caused by misoperation.

[0077] In one specific embodiment, the charging module includes a first motor and a first inverter; wherein the first inverter includes a first bridge arm and a second bridge arm, the first end of the first bridge arm is connected to the positive terminal of the charging port and the positive terminal of the power battery respectively, the second end of the first bridge arm is connected to the first motor and the first end of the second bridge arm respectively, and the second end of the second bridge arm is connected to the negative terminal of the charging port and the negative terminal of the power battery; wherein a third switch group is connected in series between the first motor and the positive terminal of the charging port.

[0078] In this embodiment, referring to Figure 3, the DC charging port B is used as an example. The charging module includes a first motor and a first inverter. The first inverter includes a first bridge arm and a second bridge arm. The first bridge arm is the upper bridge arm, corresponding to VT13, VT15, and VT13 in Figure 3. The second bridge arm is the lower bridge arm, corresponding to VT14, VT16, and VT18 in Figure 3. The first end of the first bridge arm is connected to the positive terminal of the charging port and the positive terminal of the power battery, respectively. The second end of the first bridge arm is connected to the first end of the first motor and the first end of the second bridge arm, respectively. The second end of the second bridge arm is also connected to the positive terminal of the charging port and the positive terminal of the power battery. A third switch group is connected in series between the first motor and the positive terminal of the charging port. Therefore, in the direct-connection charging circuit, the control module can control the first bridge arm and the second bridge arm to close. The output voltage of the charging pile will not charge the power battery through the first inverter, and the first motor will not consume the output voltage of the charging pile. The output voltage of the charging pile can directly charge the power battery through the first switch group and the second switch group.

[0079] In the buck charging circuit and the boost charging circuit, the control module can involve the first motor and the first inverter. Specifically, by controlling the switching states of the first and second bridge arms, the charging pile can charge the first motor, storing some electrical energy in the first motor. Then, depending on the need for the buck charging circuit or the boost charging circuit to be turned on, the electrical energy stored in the first motor can be released into the power battery.

[0080] The following section will first explain how the direct-connect charging circuit is activated to charge the power battery:

[0081] In one specific embodiment, as shown in Figure 3, the first switch group includes a first switch and a second switch, and the second switch group includes a third switch and a fourth switch. The first switch is connected in series between the positive terminal of the power battery and the first bridge arm; the second switch is connected in series between the first bridge arm and the positive terminal of the charging port; the third switch is connected in series between the negative terminal of the power battery and the second bridge arm; and the fourth switch is connected in series between the second bridge arm and the negative terminal of the charging port. The control module is specifically configured to close the first, second, third, and fourth switches when the output voltage is equal to the first voltage, thereby activating the direct-connect charging circuit.

[0082] In this embodiment, the first switch is K1, the second switch is K4, the third switch is K2, and the fourth switch is K7. The first switch is connected in series between the positive terminal of the power battery and the first bridge arm, the second switch is connected in series between the first bridge arm and the positive terminal of the charging port, the third switch is connected in series between the negative terminal of the power battery and the second bridge arm, and the fourth switch is connected in series between the second bridge arm and the negative terminal of the charging port. When the output voltage is equal to the first voltage, that is, the output voltage of the charging pile matches the charging required by the power battery, the power battery can be directly charged without adjusting the output voltage of the charging pile. Therefore, the control module can directly control the first, second, third, and fourth switches to close, thus connecting the direct charging circuit. Referring to Figure 4, which is a schematic diagram of the current flow of a direct charging circuit provided in this embodiment, the power battery is charged according to the current flow in Figure 4. When the output voltage of the charging pile matches the voltage required by the power battery, since DC charging port A and DC charging port B do not charge simultaneously, assuming the charging pile is plugged into DC charging port B, DC charging port B will perform direct charging. In this case, K4 and K7 in Figure 4 will be closed, K5 and K6 will be open, and K1 and K2 will be closed, thus realizing the direct charging function. For direct charging using DC charging port A alone, please refer to DC charging port B. If DC charging port B and DC charging port A charge the power battery together, refer to the current flow direction of DC charging port A in Figure 3, which will not be elaborated further.

[0083] Then, the activation of the buck charging circuit is explained:

[0084] In one specific embodiment, referring to Figure 3, the third switch group includes a fifth switch, and the first switch group includes a sixth switch; wherein the fifth switch is connected in series between the first motor and the positive terminal of the charging port, and the sixth switch is connected in series between the first switch and the positive terminal of the charging port; the control module is specifically configured to alternately conduct the first circuit and the second circuit when the output voltage is higher than the first voltage, wherein the first circuit is the circuit between the charging port, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the first bridge arm, the first motor, and the power battery; the second circuit is the circuit between the first motor, the first switch, the third switch, the fifth switch, the sixth switch, the second bridge arm, and the power battery, and the first circuit and the second circuit constitute a step-down charging circuit; when the first circuit is conducting, the charging port charges the first motor and the power battery; when the second circuit is conducting, the first motor charges the power battery.

[0085] In this embodiment, the fifth switch is K5 and the sixth switch is K6. The fifth switch is connected in series between the first motor and the positive terminal of the charging port, and the sixth switch is connected in series between the first switch and the positive terminal of the charging port. When the output voltage of the charging pile is higher than the first voltage, the control module alternately conducts the first circuit and the second circuit. Since the first circuit is the circuit between the charging port, the first motor, the power battery, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the first bridge arm, and the second circuit is the circuit between the first motor, the power battery, the first switch, the second switch, the third switch, the fifth switch, the sixth switch and the second switch, the first circuit and the second circuit constitute a step-down charging circuit.

[0086] The following will refer to Figures 5 and 6. Figure 5 is a current flow diagram of a buck charging circuit according to an embodiment of this application, and Figure 6 is a current flow diagram of a buck charging circuit according to an embodiment of this application, to illustrate the charging of the power battery by the buck charging circuit:

[0087] Therefore, when the output voltage of the charging pile is higher than the first voltage, the control module activates the first circuit. At this time, the charging port flows according to the current direction shown in Figure 5, K2 closes, K1 opens, and K4, K5, K6, and K7 close. The first bridge arm is activated, and some electrical energy is stored in the first motor through the first bridge arm. This effectively reduces the output voltage of the charging pile and prevents excessively high voltage from damaging the power battery.

[0088] Since the first motor has limited stored energy, when its stored energy is full, it needs to release the stored energy back into the power battery. Therefore, the control module activates the second circuit. The first motor can be connected through the current flow shown in Figure 6. K2 is closed, K1 is open, K5 and K6 are closed, and K4 and K7 are open. The second bridge arm is activated, and the stored energy in the first motor is released into the power battery through the second bridge arm so that the first motor can charge the power battery. If DC charging port B and DC charging port A charge the power battery together, the current flow of DC charging port A will be shown in Figures 5 and 6.

[0089] Finally, the activation of the boost charging circuit is explained:

[0090] In one specific embodiment, referring to Figure 3, the control module is specifically configured to alternately conduct the third circuit and the fourth circuit when the output voltage is lower than the first voltage. The third circuit is the circuit between the first motor, the power battery, the fourth switch, the fifth switch, and the second bridge arm; the fourth circuit is the circuit between the charging port, the first motor, the power battery, the first switch, the third switch, the fourth switch, the fifth switch, and the first bridge arm. The third and fourth circuits constitute a boost charging circuit. When the third circuit is conducting, the charging port charges the first motor; when the fourth circuit is conducting, the charging port and the first motor jointly charge the power battery.

[0091] In this embodiment, when the output voltage is lower than the first voltage, the control module alternately conducts the third circuit and the fourth circuit; wherein, the third circuit is the circuit between the first motor, the power battery, the fourth switch, the fifth switch and the second bridge arm; the fourth circuit is the circuit between the charging port, the first motor, the power battery, the first switch, the third switch, the fourth switch, the fifth switch and the first bridge arm, and the third circuit and the fourth circuit constitute a boost charging circuit.

[0092] The following will refer to Figures 7 and 8. Figure 7 is a current flow diagram of a boost charging circuit according to an embodiment of this application, and Figure 8 is a current flow diagram of a boost charging circuit according to an embodiment of this application, to illustrate the charging of the power battery by the boost charging circuit:

[0093] Therefore, when the output voltage of the charging pile is lower than the first voltage, the control module activates the third circuit. Following the current flow direction shown in Figure 7, K5 and K7 close, K4 and K6 open, and K1 and K2 open. Simultaneously, the second bridge arm activates, and the charging port charges the first motor through the second bridge arm, storing some electrical energy in the first motor. If DC charging port B and DC charging port A jointly charge the power battery, the current flow direction of DC charging port A will be shown in Figures 7 and 8.

[0094] Since the first motor has limited energy storage, when the energy stored in the first motor is full, the control module activates the fourth circuit. The charging port and the first motor can maintain the current flow direction shown in Figure 8, keeping K5 and K7 closed and K4 and K6 open. This controls the first bridge arm to conduct, the second bridge arm to open, and K1 and K2 to close, allowing the first motor to continue its current flow. At this time, the charging port and the first motor together charge the power battery through the first bridge arm, improving charging efficiency.

[0095] Furthermore, since power batteries are often composed of multiple battery packs, the equalization of power among each battery pack in a power battery is also a problem that needs to be solved. Therefore, in order to address this problem, this application provides an equalization module that is connected to the power battery and can achieve equalization among the various battery packs in the power battery.

[0096] Referring to Figure 9, which is a schematic diagram of another charging system provided in an embodiment of this application, the power battery includes a first battery and a second battery connected in series. The charging system also includes an equalization module connected to the power battery, configured to transfer part of the power of the first battery to the second battery or transfer part of the power of the second battery to the first battery when the power difference between the power of the first battery and the power of the second battery exceeds a first difference value, so that the power difference is less than or equal to the first difference value.

[0097] In this embodiment, the first difference can be the power balance threshold between each battery cell (such as the first battery and the second battery) inside the power battery, that is, the maximum allowable range of power difference between battery cells.

[0098] The first and second batteries are connected in series. The charging system includes an equalization module connected to the power battery. When the difference in charge between the first and second batteries exceeds a first difference value, the equalization module can transfer a portion of the charge from the first battery to the second battery, or vice versa, so that the charge difference is less than or equal to the first difference value. By transferring a portion of the charge from the high-charge battery pack to the low-charge battery pack, the equalization module ensures that the charge of each battery pack in the power battery remains in a relatively balanced state, avoiding overcharging or over-discharging of some battery packs, thereby extending the overall battery life. The equalization module can improve the energy utilization rate of the entire battery system and ensure that the battery system can work efficiently during charging and discharging.

[0099] In one specific embodiment, referring to FIG3, the equalization module includes: a second motor and a second inverter; wherein, the second inverter includes a third bridge arm and a fourth bridge arm, the first end of the third bridge arm is connected to the positive terminal of the first battery, the second end of the third bridge arm is connected to the negative terminal of the first battery, the positive terminal of the second battery and the first end of the fourth bridge arm via the second motor, and the second end of the fourth bridge arm is connected to the negative terminal of the second battery.

[0100] In this embodiment, the equalization module includes a second motor and a second inverter. The second inverter includes a third bridge arm and a fourth bridge arm. The first end of the third bridge arm is connected to the positive terminal of the first battery, and the second end of the third bridge arm is connected to both the negative terminal of the first battery and the positive terminal of the second battery via the second motor. The second end of the fourth bridge arm is connected to the negative terminal of the second battery. Through the connection method shown in Figure 3, the transfer of electrical energy between the first battery and the second battery can be realized through the second motor. The third bridge arm and the fourth bridge arm can control the direction of current flow to realize the conversion of electrical energy between the first battery and the second battery.

[0101] In one specific embodiment, referring to Figure 3, the balancing module is connected to the control module. The control module is specifically configured to alternately activate the first balancing circuit and the second balancing circuit in the balancing module when the charge of the first battery is higher than that of the second battery. The first balancing circuit is the circuit between the first battery, the third bridge arm and the second motor, and the second balancing circuit is the circuit between the second motor, the fourth bridge arm and the second battery.

[0102] When the first equalization circuit is active, the first battery charges the second motor; when the second equalization circuit is active, the second motor charges the second battery.

[0103] In this embodiment, the balancing module is connected to the control module. When the charge of the first battery is higher than that of the second battery, the first balancing circuit and the second balancing circuit in the balancing module can be alternately activated. Since the first balancing circuit is the circuit between the first battery, the third bridge arm and the second motor, and the second balancing circuit is the circuit between the second motor, the fourth bridge arm and the second battery, when the first balancing circuit is activated, the first battery can charge the second motor, that is, the second electrical energy is transferred to the second motor for storage. When the second balancing circuit is activated, the electrical energy stored in the second motor is transferred to the second battery.

[0104] Referring to Figures 10 and 11, Figure 10 is a schematic diagram of the current flow direction when the first equalization circuit is turned on, and Figure 11 is a schematic diagram of the current flow direction when the second equalization circuit is turned on. It can be seen from Figures 10 and 11 that when the first equalization circuit is turned on, the first battery charges the second motor through the second motor and the fourth bridge arm. When the second equalization circuit is turned on, the second motor charges the second battery through the third bridge arm.

[0105] In one specific embodiment, the balancing module is connected to the control module. The control module is specifically configured to alternately activate the third balancing circuit and the fourth balancing circuit when the charge of the second battery is higher than that of the first battery. The third balancing circuit is the circuit between the second battery, the fourth bridge arm, and the second motor, and the fourth balancing circuit is the circuit between the second motor, the third bridge arm, and the first battery. When the third balancing circuit is activated, the second battery charges the second motor; when the fourth balancing circuit is activated, the second motor charges the first battery.

[0106] In this embodiment, the control module alternately activates the third and fourth equalization circuits when the charge of the second battery is higher than that of the first battery. The third equalization circuit connects the second battery, the fourth bridge arm, and the second motor, while the fourth equalization circuit connects the second motor, the third bridge arm, and the first battery. Therefore, when the third equalization circuit is activated, the second battery can charge the second motor; when the fourth equalization circuit is activated, the second motor can charge the first battery.

[0107] Similar to Figures 10 and 11, when the third equalization circuit is on, the second battery charges the second motor through the second motor and the third bridge arm, and when the fourth equalization circuit is on, the second motor charges the first battery through the fourth bridge arm.

[0108] In one specific embodiment, referring to FIG3, the charging system further includes a pre-charge switch and a pre-charge resistor connected in series; wherein the pre-charge switch and the pre-charge resistor are also connected in parallel across the two ends of the first switch; the control module is further configured to control the pre-charge switch to close in response to the output voltage of the charging pile currently connected to the charging port, pre-charge the capacitors at both ends of the power battery through the pre-charge resistor, disconnect the pre-charge switch after pre-charging is completed, control the first switch to close, and conduct the target circuit when the first switch is closed.

[0109] In this embodiment, the charging system also includes a pre-charge switch and a pre-charge resistor connected in series. The pre-charge switch and the pre-charge resistor are also connected in parallel across the first switch. In order to prevent the transient voltage output by the charging pile through the charging port from damaging the electronic components in the power supply circuit where the power battery is located, pre-charging is required before charging the power battery. Specifically, when the charging pile outputs voltage at the charging port, the pre-charge switch is closed. The output voltage of the charging pile first pre-charges the pre-charge resistor. After the pre-charging is completed, the first switch is controlled to close. When the first switch is closed, the output voltage of the charging pile is adjusted by the target circuit and then the adjusted voltage is used to charge the power battery.

[0110] In one specific embodiment, referring to Figure 3, the charging system further includes a first capacitor; wherein the first capacitor is connected in parallel between the power battery and the charging module or equalization module.

[0111] In this embodiment, the first capacitor is connected in parallel between the power battery and the charging module or equalization module. Referring to Figure 3, the first capacitor can be C1, C2, or C3 in Figure 3. During the charging process of the power battery, the first capacitor can reduce voltage fluctuations during charging and ensure the stability of the voltage entering the power battery. Secondly, in the initial stage of charging, when there is a large instantaneous current output time, the first capacitor can quickly provide start-up discharge, smooth the current, and reduce the sudden change in current. When the circuit is closed instantaneously, the cooperation between the first capacitor and the pre-charge resistor can also ensure that the current component increases when the power supply circuit is closed, avoiding the impact of large current on circuit reduction and extending the service life of components.

[0112] In addition, a second capacitor is shown in Figure 3, which is connected in parallel across the charging port to ensure the stability of the charging port's output voltage. Specifically, the second capacitor can be C4 and C5 as shown in Figure 3.

[0113] A second aspect of this application provides a vehicle that includes the charging system provided in the first aspect of this application.

[0114] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0115] This application describes embodiments of methods and apparatus according to flowchart illustrations and / or block diagrams. It should be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded formula processor, or other programmable data processing terminal equipment to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal equipment, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0116] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0117] These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable terminal equipment, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0118] Although some embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including some embodiments as well as all changes and modifications falling within the scope of the embodiments of this application.

[0119] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0120] The charging system and vehicle provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A charging system, wherein, include: At least one charging port; A charging module is connected between the charging port and the power battery, including a direct charging circuit, a boost charging circuit and a buck charging circuit connected to the power battery. as well as The control module is connected to the charging module; The control module is configured to, in response to the output voltage of the charging pile currently connected to the charging port, conduct a target circuit corresponding to the output voltage in the direct-connect charging circuit, the boost charging circuit, and the buck charging circuit to charge the power battery.

2. The charging system according to claim 1, wherein, It includes multiple charging modules; wherein, the multiple charging modules correspond to multiple charging ports; The control module is configured to, in response to the output voltage of the charging pile currently connected to the plurality of charging ports, conduct a plurality of target circuits corresponding to the output voltage in the plurality of charging modules to charge the power battery.

3. The charging system according to any one of claims 1-2, wherein, The control module is specifically configured as follows: When the output voltage is equal to the first voltage, the direct charging circuit is turned on. And when the output voltage is higher than the first voltage, control the buck charging circuit to turn on; And when the output voltage is lower than the first voltage, control the boost charging circuit to turn on.

4. The charging system according to any one of claims 1-3, wherein, The charging system further includes a first switch group, a second switch group, and a third switch group; wherein, the first switch group is connected in series between the positive terminal of the power battery and the charging port, the second switch group is connected in series between the negative terminal of the power battery and the charging port, and the third switch group is connected in series between the charging module and the charging port. The control module is also configured to control the state of the switches in the first switch group, the second switch group, and the third switch group in response to a charging signal, so as to turn on the target circuit.

5. The charging system according to claim 4, wherein, The charging module includes a first motor and a first inverter; wherein, the first inverter includes a first bridge arm and a second bridge arm, the first end of the first bridge arm is connected to the positive terminal of the charging port and the positive terminal of the power battery respectively, the second end of the first bridge arm is connected to the first motor and the first end of the second bridge arm respectively, and the second end of the second bridge arm is connected to the negative terminal of the charging port and the negative terminal of the power battery. The third switch group is connected in series between the first motor and the positive terminal of the charging port.

6. The charging system according to claim 5, wherein, The first switch group includes a first switch and a second switch, and the second switch group includes a third switch and a fourth switch; The first switch is connected in series between the positive terminal of the power battery and the first bridge arm; the second switch is connected in series between the first bridge arm and the positive terminal of the charging port; the third switch is connected in series between the negative terminal of the power battery and the second bridge arm; and the fourth switch is connected in series between the second bridge arm and the negative terminal of the charging port. The control module is specifically configured to close the first switch, the second switch, the third switch and the fourth switch when the output voltage is equal to the first voltage, thereby turning on the direct charging circuit.

7. The charging system according to claim 6, wherein, The third switch group includes a fifth switch, and the first switch group further includes a sixth switch; wherein the fifth switch is connected in series between the first motor and the positive terminal of the charging port, and the sixth switch is connected in series between the first switch and the positive terminal of the charging port; The control module is specifically configured to alternately conduct the first circuit and the second circuit when the output voltage is higher than the first voltage. The first circuit is the circuit between the charging port, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the first bridge arm, the first motor, and the power battery. The second circuit is the circuit between the first motor, the first switch, the third switch, the fifth switch, the sixth switch, the second bridge arm, and the power battery. The first circuit and the second circuit constitute the buck charging circuit. When the first circuit is open, the charging port charges the first motor and the power battery; When the second circuit is open, the first motor charges the power battery.

8. The charging system according to claim 7, wherein, The control module is specifically configured to alternately activate the third circuit and the fourth circuit when the output voltage is lower than the first voltage; wherein, the third circuit is the circuit between the charging port, the first motor, the fourth switch, the fifth switch and the second bridge arm; the fourth circuit is the circuit between the charging port, the first motor, the power battery, the first switch, the third switch, the fourth switch, the fifth switch and the first bridge arm, and the third circuit and the fourth circuit constitute the boost charging circuit; When the third circuit is activated, the charging port charges the first motor; When the fourth circuit is activated, the charging port and the first motor charge the power battery together.

9. The charging system according to claim 1, wherein, The power battery includes: a first battery and a second battery connected in series; the charging system further includes: The balancing module, connected to the power battery, is configured to transfer a portion of the charge from the first battery to the second battery, or transfer a portion of the charge from the second battery to the first battery, when the charge difference between the first battery and the second battery exceeds a first difference value, so that the charge difference is less than or equal to the first difference value.

10. The charging system according to claim 9, wherein, The equalization module includes: a second motor and a second inverter; The second inverter includes a third bridge arm and a fourth bridge arm. The first end of the third bridge arm is connected to the positive terminal of the first battery. The second end of the third bridge arm is connected to the negative terminal of the first battery, the positive terminal of the second battery, and the first end of the fourth bridge arm via the second motor. The second end of the fourth bridge arm is connected to the negative terminal of the second battery.

11. The charging system according to claim 10, wherein, The balancing module is connected to the control module. The control module is specifically configured to alternately activate the first balancing circuit and the second balancing circuit in the balancing module when the charge of the first battery is higher than that of the second battery. The first balancing circuit is the circuit between the first battery, the third bridge arm, and the second motor, and the second balancing circuit is the circuit between the second motor, the fourth bridge arm, and the second battery. When the first equalization circuit is activated, the first battery charges the second motor; When the second equalization circuit is activated, the second motor charges the second battery.

12. The charging system according to claim 10, wherein, The balancing module is connected to the control module. Specifically, the control module is configured to alternately activate a third balancing circuit and a fourth balancing circuit when the charge of the second battery is higher than that of the first battery. The third balancing circuit is the circuit between the second battery, the fourth bridge arm, and the second motor; the fourth balancing circuit is the circuit between the second motor, the third bridge arm, and the first battery. When the third equalization circuit is activated, the second battery charges the second motor; When the fourth equalization circuit is activated, the second motor charges the first battery.

13. The charging system according to claim 4 or 6, wherein, The charging system also includes a pre-charge switch and a pre-charge resistor connected in series; wherein the pre-charge switch and the pre-charge resistor are also connected in parallel across the two ends of the first switch; The control module is also configured to, in response to the output voltage of the charging pile currently connected to the charging port, control the pre-charge switch to close, pre-charge the capacitors at both ends of the power battery through the pre-charge resistor, disconnect the pre-charge switch after pre-charging is completed, control the first switch to close, and conduct the target circuit when the first switch is closed.

14. The charging system according to any one of claims 9-12, wherein, The charging system further includes a first capacitor; wherein the first capacitor is connected in parallel between the power battery and the charging module or the equalization module.

15. The charging system according to any one of claims 3, 6-7, wherein, The first voltage is the charging voltage required by the power battery.

16. The charging system according to any one of claims 5-8, wherein, The first bridge arm is the upper bridge arm, and the second bridge arm is the lower bridge arm.

17. The charging system according to claim 9, wherein, The first difference is the power balance threshold between the first battery and the second battery.

18. The charging system according to any one of claims 1-14, wherein, The charging system also includes a second capacitor; wherein the second capacitor is connected in parallel across the two ends of the charging port.

19. A vehicle, wherein, The vehicle includes the charging system according to any one of claims 1-18.

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