Charging circuit, charging control method, vehicle and storage medium

Abstract

The invention provides a charging circuit, a charging control method, a vehicle and a storage medium. The charging circuit comprises a battery pack, a charging port and an energy storage circuit, and the battery pack comprises a first battery pack and a second battery pack which are connected in series; the first battery pack is connected with the charging port, and the energy storage circuit is connected between the charging port and the second battery pack.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of vehicles, and more particularly, to a charging circuit, a charging control method, a vehicle, and a computer readable storage medium. BACKGROUND

[0002] With the rapid development of the new energy automobile industry, it has been applied to more and more families with the advantages of low carbon environmental protection, low noise, high driving efficiency, etc., and the battery pack as the core component of the new energy automobile provides power source for the automobile.

[0003] In the prior art, the battery pack of the new energy automobile is charged in the direct current charging mode and the alternating current charging mode.

[0004] However, in the alternating current charging mode, the output voltage of the alternating current charging system needs to meet the whole pack charging, so the voltage resistance requirement of the parts is high, which increases the cost of the vehicle. In the direct current charging mode, the motor is usually used to boost the voltage to charge the battery pack, but a capacitor needs to be added between the positive and negative poles of the direct current charging port. In the charging preparation stage, the battery pack voltage needs to be reduced to charge the capacitor through the motor electric control, so that the battery voltage is detected by the charging pile to meet the charging start condition, and the addition of the capacitor increases the cost of the vehicle. SUMMARY

[0005] One object of the embodiments of the present disclosure is to provide a new technical solution for controlling the charging of a vehicle.

[0006] According to a first aspect of the present disclosure, a charging circuit is provided, comprising a battery pack, a charging port, and an energy storage circuit, the battery pack comprising a first battery pack and a second battery pack connected in series; the first battery pack is connected with the charging port, and the energy storage circuit is connected between the charging port and the second battery pack.

[0007] Optionally, the charging port is configured to directly charge the first battery pack and pulse charge the second battery pack through the energy storage circuit when the charging mode of the charging circuit is an alternating current charging mode or a first direct current charging mode.

[0008] Optionally, the charging port is configured to charge the battery pack as a whole through the energy storage circuit when the charging mode is a second direct current charging mode.

[0009] Optionally, the charging circuit further comprises a control module, and the control module is further configured to:

[0010] determine that the charging mode is an alternating current charging mode when it is detected that the charging port is connected with an alternating current charging pile;

[0011] In a case where it is detected that the charging port is connected with the direct-current charging pile and the output voltage of the direct-current charging pile is less than the voltage of the battery pack, it is determined that the charging mode is a first direct-current charging mode.

[0012] In a case where it is detected that the charging port is connected with the direct-current charging pile and the output voltage of the direct-current charging pile is greater than or equal to the voltage of the battery pack, it is determined that the charging mode is a second direct-current charging mode.

[0013] Optionally, a first end of the energy storage circuit is connected with a first end of the charging port, a negative electrode of the second battery pack and a positive electrode of the first battery pack, a second end of the energy storage circuit is connected with a second end of the charging port and a negative electrode of the first battery pack, and a third end of the energy storage circuit is connected with a positive electrode of the second battery pack.

[0014] Optionally, the energy storage circuit further comprises a first switch tube, a second switch tube, a capacitor and an inductor, the first switch tube and the second switch tube are connected in series between the second end and the third end of the energy storage circuit, the capacitor is connected between the second end and the third end of the energy storage circuit, and the inductor is connected between the first end of the energy storage circuit and a first potential point, which is a potential point between the first switch tube and the second switch tube.

[0015] Optionally, the charging circuit further comprises a control module, and the control module is further configured to: acquire a set charging frequency and a duty cycle, and perform switching control on the first switch tube and the second switch tube according to the charging frequency and the duty cycle, so that the charging port performs pulse charging on the second battery pack through the energy storage circuit.

[0016] Optionally, the control module is further configured to: acquire a first SOC of the first battery pack and a second SOC of the second battery pack, and adjust the charging frequency according to the first SOC and the second SOC, so that a difference between the first SOC and the second SOC is within a set range.

[0017] Optionally, the charging circuit further comprises a first switch connected between the first end of the energy storage circuit and the negative electrode of the second battery pack.

[0018] The first switch is turned on in a case where the charging mode is the alternating-current charging mode or the first direct-current charging mode, so that the charging port performs pulse charging on the second battery pack through the energy storage circuit.

[0019] Optionally, the charging port comprises a direct current charging port, a second switch and a third switch, the second switch is connected between the first end of the energy storage circuit and the positive pole of the direct current charging port, and the third switch is connected between the second input end of the energy storage circuit and the negative pole of the direct current charging port.

[0020] The second switch and the third switch are turned on when the charging mode is the first direct current charging mode or the second direct current charging mode.

[0021] Optionally, the charging port comprises an alternating current charging port, and the charging circuit further comprises an alternating current charging module and a fourth switch,

[0022] The input end of the alternating current charging module is connected with the alternating current charging port, the fourth switch is connected between the positive pole output end of the alternating current charging module and the first end of the energy storage circuit, and the negative pole output end of the alternating current charging module is connected with the second end of the energy storage circuit.

[0023] The alternating current charging module is configured to convert an alternating current signal input by the alternating current charging port into a direct current signal when the charging mode is the alternating current charging mode.

[0024] The fourth switch is turned on when the charging mode is the alternating current charging mode, so that the direct current signal output by the alternating current charging module directly charges the first battery pack and pulse charges the second battery pack through the energy storage circuit.

[0025] Optionally, the charging circuit further comprises a fifth switch and a sixth switch, the sixth switch is connected between the third end of the energy storage circuit and the positive pole of the second battery pack, and the fifth switch is connected between the negative pole of the first battery pack and the second end of the energy storage circuit.

[0026] The fifth switch and the sixth switch are turned on when the charging mode is the first direct current charging mode, the alternating current charging mode or the second direct current charging mode.

[0027] Optionally, at least one element in the energy storage circuit is multiplexed with a motor controller of a vehicle.

[0028] According to a second aspect of the present disclosure, a charging control method is provided, comprising:

[0029] Controlling a charging port to charge a first battery pack of a battery pack;

[0030] Controlling the charging port to pulse charge a second battery pack of the battery pack through an energy storage circuit.

[0031] Optionally, the charging control method further comprises:

[0032] determining a charging mode of the battery pack;

[0033] in a case where the charging mode is an alternating current charging mode or a first direct current charging mode, controlling the charging port to directly charge the first battery pack and to pulse charge the second battery pack through the energy storage circuit.

[0034] Optionally, the charging control method further comprises:

[0035] in a case where the charging mode is a second direct current charging mode, controlling the charging port to charge the first battery pack and the second battery pack as a whole.

[0036] Optionally, the determining of the charging mode of the battery pack comprises:

[0037] in a case where it is detected that the charging port is connected with an alternating current charging pile, determining that the charging mode is the alternating current charging mode;

[0038] in a case where it is detected that the charging port is connected with a direct current charging pile and an output voltage of the direct current charging pile is less than a voltage of the battery pack, determining that the charging mode is the first direct current charging mode;

[0039] in a case where it is detected that the charging port is connected with a direct current charging pile and an output voltage of the direct current charging pile is greater than or equal to the voltage of the battery pack, determining that the charging mode is the second direct current charging mode.

[0040] Optionally, the controlling of the charging port to pulse charge the second battery pack of the battery pack through the energy storage circuit comprises:

[0041] in a first time period of any charging cycle, controlling the charging port to charge the energy storage circuit;

[0042] in a second time period of the any charging cycle, controlling the energy storage circuit to discharge through the second battery pack to charge the second battery pack.

[0043] Optionally, the charging control method further comprises:

[0044] obtaining a first SOC of the first battery pack and a second SOC of the second battery pack;

[0045] adjusting a charging frequency of the pulse charging of the second battery pack according to the first SOC and the second SOC, so that an SOC difference between the first SOC and the second SOC is within a set range.

[0046] According to a third aspect of the present disclosure, a vehicle is provided, comprising the charging circuit according to the first aspect of the present disclosure.

[0047] According to a fourth aspect of the present disclosure, a vehicle is provided, comprising a processor and a memory for storing a computer program, the processor being configured to execute the charging control method according to the second aspect of the present disclosure under control of the computer program.

[0048] According to a fifth aspect of the present disclosure, a computer readable storage medium is provided, having stored thereon a computer program which, when executed by a processor, implements the charging control method according to the second aspect of the present disclosure.

[0049] Through the embodiment, the first battery pack is connected with the charging port, and the second battery pack is connected with the charging port through the energy storage circuit, which can provide a hardware circuit basis for the charging port to directly charge the first battery pack and pulse charge the second battery pack, so that the charging circuit can be compatible with DC charging piles with different voltage output capabilities, improve the adaptability of the charging circuit, and also reduce the voltage resistance requirement of parts in the charging circuit and the cost of the charging circuit.

[0050] Other features and advantages of the present application will become apparent from the following detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0051] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0052] Figure 1 is a block diagram of a charging circuit according to an embodiment of the present disclosure;

[0053] Figure 2 is a circuit diagram of a charging circuit according to an embodiment of the present disclosure;

[0054] Figure 3 is a flowchart of a charging control method according to an embodiment of the present disclosure;

[0055] Figure 4 is a flowchart of a charging control method according to an embodiment of the present disclosure;

[0056] Figure 5 is a block diagram of a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0057] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0058] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0059] Techniques, methods, and apparatus known to those skilled in the art in the relevant field may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0060] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0061] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0062] <Charging Circuit>

[0063] This disclosure provides a charging circuit, such as Figure 1 As shown, the charging circuit 1000 may include a battery pack 1100, a charging port 1200, and an energy storage circuit 1400. The battery pack 1100 includes a first battery group 1110 and a second battery group 1120 connected in series. The first battery group 1110 is connected to the charging port 1200, and the energy storage circuit 1400 is connected between the charging port 1200 and the second battery group 1120.

[0064] In this embodiment, the positive terminal of the first battery pack 1110 can be connected to the first terminal of the charging port 1200, and the negative terminal of the first battery pack 1110 can be connected to the second terminal of the charging port 1200. The first terminal of the energy storage circuit 1400 can be connected to the first terminal of the charging port 1200 and the negative terminal of the second battery pack 1120, the second terminal of the energy storage circuit 1400 can be connected to the second terminal of the charging port 1200 and the negative terminal of the first battery pack 1110, and the third terminal of the energy storage circuit 1400 can be connected to the positive terminal of the second battery pack 1120.

[0065] By the embodiment, the first battery pack is connected with the charging port, and the second battery pack is connected with the charging port through the energy storage circuit, which can provide a hardware circuit basis for the charging port to perform direct charging for the first battery pack and pulse charging for the second battery pack, so that the charging circuit can be compatible with direct current charging piles with different voltage output capabilities, the adaptability of the charging circuit is improved, and the voltage resistance requirement of components in the charging circuit can be reduced, and the cost of the charging circuit is reduced.

[0066] In one embodiment of the present disclosure, as shown in Figure 2 The control module 1300 is configured to: determine that the charging mode is an alternating current charging mode when it is detected that the charging port 1200 is connected with an alternating current charging pile; determine that the charging mode is a first direct current charging mode when it is detected that the charging port 1200 is connected with a direct current charging pile and the output voltage of the direct current charging pile is less than the voltage of the battery pack; and determine that the charging mode is a second direct current charging mode when it is detected that the charging port 1200 is connected with a direct current charging pile and the output voltage of the direct current charging pile is greater than or equal to the voltage of the battery pack.

[0067] In general, the charging port 1200 can include a direct current charging port and / or an alternating current charging port, and at most one of the direct current charging port and the alternating current charging port is connected with a corresponding charging pile. When the direct current charging port of the charging port 1200 is not connected with a direct current charging pile and the alternating current charging port of the charging port 1200 is not connected with an alternating current charging pile, it can be determined that the charging circuit is not in the charging mode. When the direct current charging port of the charging port 1200 is connected with a direct current charging pile or the alternating current charging port of the charging port 1200 is connected with an alternating current charging pile, it can be determined that the charging circuit is in the charging mode.

[0068] In the embodiment, the charging mode of the charging circuit can be determined by the charging pile connected with the charging port 1200.

[0069] When the charging port 1200 is connected with an alternating current charging pile through the alternating current charging port, it can be determined that the charging mode of the charging circuit is the alternating current charging mode. When the charging port 1200 is connected with a direct current charging pile through the direct current charging port, it can be determined that the charging mode of the charging circuit is the direct current charging mode.

[0070] Further, when the output voltage of the direct current charging pile connected with the charging port 1200 through the direct current charging port is less than the voltage of the battery pack, it can be determined that the charging mode of the charging circuit is the first direct current charging mode; and when the output voltage of the direct current charging pile connected with the charging port 1200 through the direct current charging port is greater than or equal to the voltage of the battery pack, it can be determined that the charging mode of the charging circuit is the second direct current charging mode.

[0071] In this embodiment, the control module 1300 can determine that the charging circuit enters a direct current charging process in a case where it is detected that the direct current charging port is connected to the charging gun and a direct current charging handshake interaction signal sent by the direct current charging pile connected by the charging gun is received; and determine that the charging circuit enters an alternating current charging process in a case where it is detected that the alternating current charging port is connected to the charging gun and an alternating current charging handshake interaction signal sent by the alternating current charging pile connected by the charging gun is received.

[0072] In a case where the charging circuit enters the alternating current charging process, the control module 1300 can determine that the charging mode of the charging circuit is the alternating current charging mode; in a case where the charging circuit enters the direct current charging process, the control module 1300 can detect the output voltage of the direct current charging pile and the voltage of the battery pack, and determine that the charging mode of the charging circuit is the first direct current charging mode in a case where the output voltage of the direct current charging pile is less than the voltage of the battery pack; and determine that the charging mode of the charging circuit is the second direct current charging mode in a case where the output voltage of the direct current charging pile is greater than or equal to the voltage of the battery pack.

[0073] Through this embodiment, the charging mode of the charging circuit can be determined, and then the battery pack is charged according to the charging mode, so that the charging circuit can be compatible with direct current charging piles with different voltage output capabilities, and the adaptability of the charging circuit is improved.

[0074] In an embodiment of the present disclosure, the charging port 1200 is configured to directly charge the first battery pack 1110 and pulse charge the second battery pack through the energy storage circuit 1400 in a case where the charging mode of the charging circuit is the alternating current charging mode or the first direct current charging mode.

[0075] The charging port 1200 directly charges the first battery pack 1110, which can be that the control module 1300 controls the first end of the charging port 1200 to be conductive between the positive electrode of the first battery pack 1110 and controls the second end of the charging port 1200 to be conductive between the negative electrode of the first battery pack 1110, so that the charging port 1200 directly charges the first battery pack 1110.

[0076] The charging port 1200 pulse charges the second battery pack 1120, which can be that the control module 1300 controls the charging port 1300 to charge the energy storage circuit 1400 in the first period of each charging period, and controls the energy storage circuit 1400 to charge the second battery pack 1120 in the second period of each charging period.

[0077] Specifically, each charging period can be divided into a first period and a second period, and the total length of one first period and one second period can be equal to the length of one charging period. The length of one first period and one second period can be equal.

[0078] Through the embodiment, in the case that the charging mode of the charging port is the alternating current charging mode or the first direct current charging mode, the charging port directly charges the first battery pack, and the energy storage circuit charges the second battery pack in pulse, so that the charging circuit can be compatible with alternating current charging piles and direct current charging piles with different voltage output capabilities, and the adaptability of the charging circuit is improved. In addition, the voltage resistance requirement of the components in the charging circuit can be reduced, and the cost of the charging circuit is reduced.

[0079] In the embodiment, the control module 1300 can control the first end of the energy storage circuit 1400 to be conductive between the first end of the charging port 1200 and the negative electrode of the second battery pack 1120, control the second end of the energy storage circuit 1400 to be conductive between the second end of the charging port 1200, and control the third end of the energy storage circuit 1400 to be conductive between the positive electrode of the second battery pack, so that the charging port 1200 charges the second battery pack 1120 in pulse through the energy storage circuit 1400.

[0080] Further, the control module 1300 can control the first end of the charging port 1200 to be conductive between the positive electrode of the first battery pack 1110, and control the second end of the charging port 1200 to be conductive between the negative electrode of the first battery pack 1110, so that the charging port 1200 directly charges the first battery pack 1110.

[0081] In one embodiment of the present disclosure, the charging port 1200 is configured to charge the battery pack 1100 in whole through the energy storage circuit 1400 in the case that the charging mode of the charging circuit is the second direct current charging mode.

[0082] In the embodiment in which the negative electrode of the second battery pack 1120 is connected to the positive electrode of the first battery pack 1110, when the charging port 1200 charges the battery pack 1100 in whole through the energy storage circuit 1400, the control module 1300 can control the first end of the energy storage circuit 1400 to be conductive between the first end of the charging port 1200, control the first end of the energy storage circuit 1400 to be disconnected between the positive electrode of the first battery pack 1110 and the negative electrode of the second battery pack 1120, control the second end of the energy storage circuit 1400 to be conductive between the second end of the charging port 1200 and the negative electrode of the first battery pack 1110, and control the third end of the energy storage circuit 1400 to be conductive between the positive electrode of the second battery pack, so that the direct current signal output by the charging port 1200 charges the first battery pack and the second battery pack connected in series through the energy storage circuit 1400 at the same time.

[0083] In one embodiment of the present disclosure, as shown in Figure 2 The charging port 1200 includes a direct current charging port 1210, the positive electrode of the direct current charging port 1210 is connected to the first end of the energy storage circuit 1400, and the negative electrode of the direct current charging port 1210 is connected to the second end of the energy storage circuit 1400.

[0084] The direct current charging port 1210 is configured to, in the case that the charging mode is the first direct current charging mode, perform direct connection charging on the first battery pack 1110 and perform pulse charging on the second battery pack 1120 through the energy storage circuit 1400; and in the case that the charging mode is the second direct current charging mode, perform whole-pack charging on the battery pack 1100 through the energy storage circuit 1400.

[0085] Through the embodiment, the charging circuit can be compatible with direct current charging piles with different voltage output capabilities, and the adaptability of the charging circuit is improved.

[0086] In one embodiment of the present disclosure, as shown in Figure 2 The charging port 1200 further includes an alternating current charging port 1220, and the charging circuit 1000 further includes an alternating current charging module 1500. An input end of the alternating current charging module 1500 is connected with the alternating current charging port 1220, a positive output end of the alternating current charging module 1500 is connected with the first end of the energy storage circuit 1400, and a negative output end of the alternating current charging module 1500 is connected with the second end of the energy storage circuit 1400. The alternating current charging module 1500 is configured to, in the case that the charging mode is an alternating current charging mode, convert an alternating current signal input by the alternating current charging port 1220 into a direct current signal, so that the direct current signal performs direct connection charging on the first battery pack 1110 and performs pulse charging on the second battery pack 1120 through the energy storage circuit 1400.

[0087] Through the embodiment, the charging circuit can be compatible with alternating current charging piles, and the adaptability of the charging circuit is improved.

[0088] In one embodiment of the present disclosure, as shown in Figure 2 The energy storage circuit 1400 further includes a first switch tube T1, a second switch tube T2, a capacitor C1 and an inductor L1. The first switch tube T1 and the second switch tube T2 are connected in series between the second end and the third end of the energy storage circuit 1400. The capacitor C1 is connected between the second end and the third end of the energy storage circuit 1400. The inductor L1 is connected between a first potential point P1 and the first end of the energy storage circuit 1400. The first potential point P1 is a potential point between the first switch tube T1 and the second switch tube T2.

[0089] In the embodiment, at most one of the first switch tube T1 and the second switch tube T2 is in a conduction state.

[0090] Specifically, the control module 1300 can control the first switch tube T1 to be off and the second switch tube T2 to be on in a first time period of each charging cycle, so that the inductor L1 is charged and stored energy, and control the first switch tube T1 to be on and the second switch tube T2 to be off in a second time period of each charging cycle, so that the inductor L1 is discharged to charge the second battery pack 1120. In any charging cycle of the embodiment, the first time period is earlier than the second time period.

[0091] Further, the charging frequency of the charging port 1200 for pulse charging the second battery pack 1120 is the same as the switching control frequency of the first switch tube T1 and the second switch tube T2.

[0092] Still further, the control module 1300 can output a first PWM signal to the first switch tube T1 and output a second PWM signal to the second switch tube T2, the frequency of the first PWM signal and the second PWM signal is the same, the duty cycle of the first PWM signal and the duty cycle of the second PWM signal is 1, and the level state of the first PWM signal and the second PWM signal at the same time is opposite.

[0093] In the embodiment, the control module controls the switching state of the first switch tube and the second switch tube in the energy storage circuit to realize the pulse charging of the charging port to the second battery pack.

[0094] In an embodiment of the present disclosure, the control module 1300 is configured to obtain a set charging frequency and a duty cycle, and switch control the first switch tube T1 and the second switch tube T2 according to the charging frequency and the duty cycle, so that the charging port 1200 pulse charges the second battery pack 1120 through the energy storage circuit 1400.

[0095] In the embodiment, the set duty cycle can include the duty cycle of the first PWM signal and the duty cycle of the second PWM signal. The duty cycle is related to the output voltage of the charging port, the voltage of the second battery pack, and the hardware circuit parameters of the charging circuit. Therefore, the control module 1300 can determine the duty cycle according to the output voltage of the charging port, the voltage of the second battery pack, and the hardware circuit parameters of the charging circuit.

[0096] In an example, the duty cycle of the first PWM signal and the second PWM signal can be the same or different, which is not limited here. For example, the duty cycle of the first PWM signal and the second PWM signal can be 50%, or the duty cycle of the first PWM signal can be 40% and the duty cycle of the second PWM signal can be 60%.

[0097] Further, in the process of controlling the charging port to pulse charge the second battery pack 1120, the duty cycle can remain unchanged.

[0098] In the embodiment, when the control module 1300 just starts to control the charging port to pulse-charge the second battery pack 1120 through the energy storage circuit, the control module 1300 can switch control the first switch tube T1 and the second switch tube T2 at an initial charging frequency. The initial charging frequency can be determined by the control module 1300 according to an initial charging current of the second battery pack 1120, and the initial charging current of the second battery pack 1120 can be determined according to the SOC and temperature of the second battery pack 1120.

[0099] Further, the charging frequency is the same as the frequency of the first PWM signal and the frequency of the second PWM signal.

[0100] In an embodiment of the disclosure, the control module 1300 is further configured to: obtain a first SOC of the first battery pack 1110 and a second SOC of the second battery pack 1120, and adjust the charging frequency according to the first SOC and the second SOC, so that the difference between the first SOC and the second SOC is within a set range.

[0101] The set range can be set in advance according to the performance of the battery pack. The set range can be an SOC range greater than zero and less than or equal to an SOC threshold. For example, the set range can be (0, 1%].

[0102] When the difference between the first SOC and the second SOC is within the set range, the second battery pack 1120 is fully charged first, and the SOC difference between the first battery pack 1110 and the second battery pack 1120 is small during the charging process.

[0103] In the embodiment, if the first battery pack 1110 is fully charged first, the first battery pack 1110 needs to be disconnected, and the charging port has no capacitive load stabilization. On this basis, when the control module 1300 controls the first switch tube T1 to be disconnected and the second switch tube T2 to be turned on, so that the inductor L1 is charged and stores energy, the charging port connected to the charging pile is easy to detect abnormally and terminate charging. Therefore, the second battery pack 1120 needs to be fully charged before the first battery pack 1110.

[0104] In addition, in order to prevent the SOC difference between the first battery pack 1110 and the second battery pack 1120 from being large at the end of charging and affecting the power supply effect of the battery pack, the SOC difference between the first battery pack 1110 and the second battery pack 1120 during the charging process needs to be small.

[0105] Therefore, by adjusting the charging frequency, this embodiment can control the distribution of the charging current of the first battery pack 1110 and the second battery pack 1120, so that the effective charging current of the second battery pack 1120 is greater than that of the first battery pack 1110, that is, the SOC of the second battery pack 1120 is slightly greater than that of the first battery pack 1110, so that the second battery pack is fully charged first, and the SOC of the first battery pack 1110 and the second battery pack 1120 are relatively close during the charging process.

[0106] In one embodiment of this disclosure, first mapping data reflecting the mapping relationship between SOC and charging frequency can be preset; based on the first SOC, the second SOC and the first mapping data, a target value corresponding to the charging frequency can be obtained.

[0107] The first mapping data can be the first mapping function, or the first lookup table, etc., and is not limited here.

[0108] For the first mapping function, the dependent variable is the charging frequency and the independent variable is the state of charge (SOC). By substituting the first SOC and the second SOC into the first mapping function, the target value of the corresponding charging frequency can be obtained.

[0109] For the first lookup table, the charging frequency corresponding to the first SOC and the second SOC can be found in the first lookup table and used as the target value of the charging frequency.

[0110] In this embodiment, the charging frequency is adjusted according to the first SOC and the second SOC, that is, the charging frequency is adjusted to a target value corresponding to the first SOC and the second SOC, so that the difference between the first SOC and the second SOC is within a set range.

[0111] In this embodiment, when there is a capacity imbalance between the first battery pack and the second battery pack, the charging frequency can be adjusted according to the first SOC and the second SOC to achieve charging current distribution control between the first battery pack and the second battery pack, thereby balancing the capacity of the first battery pack and the second battery pack.

[0112] In one embodiment of this disclosure, such as Figure 2 As shown, the first end of the charging port 1200 is connected to the positive terminal of the first battery pack 1110, and the second end of the charging port 1200 is connected to the negative terminal of the first battery pack 1110.

[0113] Through this embodiment, the charging port 1200 can be used to directly charge the first battery pack 1110.

[0114] In one embodiment of this disclosure, such as Figure 2As shown, the charging circuit also includes a first switch K1, which is connected between the first terminal of the energy storage circuit 1400 and the negative terminal of the second battery pack 1120 and the positive terminal of the first battery pack 1110. The first switch K1 is turned on when the charging mode is AC charging mode or first DC charging mode, so that the charging port 1200 performs pulse charging on the second battery pack 1120 through the energy storage circuit 1400.

[0115] Furthermore, the first switch K1 is disconnected when the charging mode is the second DC charging mode or when the charging circuit is not in charging mode.

[0116] In this embodiment, the switching state of the first switch K1 can be controlled by the control module 1300.

[0117] In this embodiment, by controlling the first switch K1 to be turned on, the charging port can perform pulse charging on the second battery pack through the energy storage circuit; by controlling the first switch K1 to be turned off, the charging port can perform full charging on the battery pack through the energy storage circuit.

[0118] In one embodiment of this disclosure, such as Figure 2 As shown, the charging circuit 1000 also includes a second switch K2 and a third switch K3. The second switch K2 is connected between the first terminal of the energy storage circuit 1400 and the positive terminal of the DC charging port 1210, and the third switch K3 is connected between the second terminal of the energy storage circuit 1400 and the negative terminal of the DC charging port 1210.

[0119] The second switch K2 and the third switch K3 are turned on when the charging mode is either the first DC charging mode or the second DC charging mode.

[0120] Furthermore, the second switch K2 and the third switch K3 are disconnected when the charging mode is AC charging mode or when the charging circuit is not in charging mode.

[0121] In this embodiment, the switching states of the second switch K2 and the third switch K3 can be controlled by the control module 1300.

[0122] In this embodiment, by controlling the second switch K2 and the third switch K3 to be turned on, the DC charging port can charge the battery pack; by controlling the second switch K2 and the third switch K3 to be turned off, the DC charging port can stop charging the battery pack.

[0123] In one embodiment of this disclosure, such as Figure 2As shown, the charging port 1200 also includes a fourth switch K4. The input terminal of the AC charging module 1500 is connected to the AC charging port 1220; the fourth switch K4 is connected between the positive output terminal of the AC charging module 1500 and the first terminal of the energy storage circuit, and the negative output terminal of the AC charging module 1500 is connected to the second terminal of the energy storage circuit.

[0124] The fourth switch K4 is turned on when the battery pack is in AC charging mode, so that the AC charging module 1500 directly charges the first battery pack 1110 and pulses the second battery pack 1120 through the energy storage circuit 1400.

[0125] Furthermore, the fourth switch K4 is disconnected when the battery pack is in the first DC charging mode or the second DC charging mode, or when the charging circuit is not in charging mode.

[0126] In this embodiment, the switching state of the fourth switch K4 can be controlled by the control module 1300.

[0127] In this embodiment, by controlling the fourth switch K4 to be turned on, the AC charging port can charge the battery pack through the AC charging module; by controlling the fourth switch K4 to be turned off, the AC charging port can stop charging the battery pack.

[0128] In one embodiment of this disclosure, such as Figure 2 As shown, the charging circuit 1000 also includes a fifth switch K5 and a sixth switch K6. The fifth switch K5 is connected between the negative terminal of the first battery pack 1110 and the second terminal of the energy storage circuit 1400, and the sixth switch K6 is connected between the third terminal of the energy storage circuit 1400 and the positive terminal of the second battery pack 1120.

[0129] The fifth switch K5 and the sixth switch K6 are turned on when the charging mode is AC charging mode, or the first DC charging mode, or the second DC charging mode.

[0130] Furthermore, the fifth switch K5 and the sixth switch K6 are disconnected when the charging circuit is not in charging mode.

[0131] In this embodiment, the switching states of the fifth switch K5 and the sixth switch K6 can be controlled by the control module 1300.

[0132] In this embodiment, the charging port can charge the battery pack by controlling the fifth switch K5 and the sixth switch K6 to be turned on, and the charging port can stop charging the battery pack by controlling the fifth switch K5 and the sixth switch K6 to be turned off.

[0133] In one embodiment of this disclosure, at least one element in the energy storage circuit is reused with the vehicle's motor controller.

[0134] This can reduce the cost of the vehicle.

[0135] When the charging mode is AC charging mode or the first DC charging mode, the control module 1300 can be configured to: determine that the charging of the second battery pack has ended when the charging end condition is detected; and determine that the charging of the first battery pack has ended when the charging end condition is detected. The charging end condition includes at least the battery pack voltage reaching the charging cutoff voltage.

[0136] In the embodiment where the charging mode is the first DC charging mode, when the control module 1300 detects that the second battery pack meets the charging end condition, it controls the first switch T1 and the second switch T2 in the energy storage circuit 1400 to be turned off, and controls the fifth switch K5 to be turned off, so as to end the charging process of the second battery pack; when the control module 1300 detects that the first battery pack meets the charging end condition, it requests the charging current to be 0 from the charging pile connected to the charging port 1200, and controls the first switch K1, the second switch K2, the third switch K3 and the sixth switch K6 to be turned off, so as to end the charging process of the first battery pack.

[0137] In an embodiment where the charging mode is AC charging mode, when the control module 1300 detects that the second battery pack meets the charging end conditions, it controls the first switch T1 and the second switch T2 in the energy storage circuit 1400 to be turned off, and controls the first switch K1 and the fifth switch K5 to be turned off, so as to end the charging process of the second battery pack; when the control module 1300 detects that the first battery pack meets the charging end conditions, it requests the charging current of 0 from the charging pile connected to the charging port 1200, and controls the fourth switch K4 and the sixth switch K6 to be turned off, so as to end the charging process of the first battery pack.

[0138] When the charging mode is the second DC charging mode, the control module 1300 can be configured to determine that the battery pack charging has ended when the charging end condition is detected. The charging end condition includes at least the battery pack voltage reaching the charging cutoff voltage.

[0139] When the control module 1300 detects that the battery pack meets the charging end conditions, it requests the charging current to be 0 from the charging pile connected to the charging port 1200. The second switch K2, the third switch K3, the fifth switch K5 and the sixth switch K6 are opened, and the first switch T1 and the second switch T2 in the energy storage circuit 1400 are both opened to end the charging process of the battery pack.

[0140] <Method>

[0141] This disclosure provides a charging control method, which can be implemented by a charging circuit.

[0142] The charging circuit includes a battery pack, a charging port, and an energy storage circuit. The battery pack includes a first battery pack and a second battery pack connected in series.

[0143] In one example, the charging circuit may be the charging circuit 1000 described in the foregoing embodiments.

[0144] Figure 3 This is a flowchart of a charging control method according to an embodiment of the present disclosure.

[0145] like Figure 3 As shown, the method includes the following steps S3100 to S3200:

[0146] Step S3100: Control the charging port to charge the first battery group of the battery pack.

[0147] Controlling the charging port to charge the first battery pack can be achieved by controlling the charging port to directly charge the first battery pack. Specifically, it can be achieved by controlling the first terminal of the energy storage circuit to conduct between the first terminal of the charging port and the positive terminal of the first battery pack, and controlling the second terminal of the energy storage circuit to conduct between the second terminal of the charging port and the negative terminal of the first battery pack, so that the charging port can DC charge the first battery pack.

[0148] Step S3200: Control the charging port to perform pulse charging on the second battery pack of the battery pack through the energy storage circuit.

[0149] The charging port can pulse charge the second battery pack through the energy storage circuit. This can be achieved by controlling the first terminal of the energy storage circuit to conduct between the first terminal of the charging port and the negative terminal of the second battery pack, controlling the second terminal of the energy storage circuit to conduct between the second terminal of the charging port, and controlling the third terminal of the energy storage circuit to conduct between the positive terminal of the second battery pack, so that the charging port pulse charges the second battery pack through the energy storage circuit.

[0150] Furthermore, the charging port can be controlled to charge the energy storage circuit during the first period of each charging cycle, and the energy storage circuit can be controlled to discharge through the second battery pack to charge the second battery pack during the second period of each charging cycle.

[0151] Specifically, each charging cycle can be divided into a first time period and a second time period, and the total duration of a first time period and a second time period can be equal to the duration of a charging cycle. The duration of a first time period and a second time period can be equal.

[0152] In this embodiment, when the charging circuit is in AC charging mode or the first DC charging mode, the control module controls the charging port to directly charge the first battery pack and controls the charging port to pulse charge the second battery pack. This enables the charging circuit to be compatible with DC charging piles with different voltage output capabilities, improving the adaptability of the charging circuit. It also reduces the voltage withstand requirements of the components in the charging circuit, thereby reducing the cost of the charging circuit.

[0153] In one embodiment of this disclosure, the charging control method may further include: determining the charging mode of the charging circuit.

[0154] Under normal circumstances, a charging port may include a DC charging port and / or an AC charging port, with at most one of the DC charging port and AC charging port connected to the corresponding charging station. If neither the DC charging port nor the AC charging port is connected to a DC charging station, it can be determined that the charging port is not in charging mode. If either the DC charging port is connected to a DC charging station, or the AC charging port is connected to an AC charging station, it can be determined that the charging port is in charging mode.

[0155] In this embodiment, the charging mode of the charging circuit can be determined by the charging pile to which the charging port is connected.

[0156] When the charging port is connected to an AC charging station via an AC charging port, the charging mode of the charging circuit can be determined to be AC ​​charging mode. When the charging port is connected to a DC charging station via a DC charging port, the charging mode of the charging circuit can be determined to be DC charging mode.

[0157] Furthermore, if the output voltage of the DC charging pile connected to the charging port through the DC charging port is less than the voltage of the battery pack, the charging mode of the charging circuit can be determined to be the first DC charging mode; if the output voltage of the DC charging pile connected to the charging port through the DC charging port is greater than or equal to the voltage of the battery pack, the charging mode of the charging circuit can be determined to be the second DC charging mode.

[0158] Based on this, determining the charging mode of the charging circuit may include: determining the charging mode of the charging circuit as AC charging mode when the charging port is detected to be connected to an AC charging pile; determining the charging mode of the charging circuit as a first DC charging mode when the charging port is detected to be connected to a DC charging pile and the output voltage of the DC charging pile is less than the voltage of the battery pack; and determining the charging mode of the charging circuit as a second DC charging mode when the charging port is detected to be connected to a DC charging pile and the output voltage of the DC charging pile is greater than or equal to the voltage of the battery pack.

[0159] In this embodiment, the charging port is determined to enter the DC charging process when it is detected that the DC charging port is connected to the charging gun and a DC charging handshake interaction signal is received from the DC charging pile connected to the charging gun; and the charging port is determined to enter the AC charging process when it is detected that the AC charging port is connected to the charging gun and an AC charging handshake interaction signal is received from the AC charging pile connected to the charging gun.

[0160] When the charging port enters the AC charging process, the charging mode of the charging circuit can be determined to be AC ​​charging mode; when the charging port enters the DC charging process, the output voltage of the DC charging pile and the voltage of the battery pack can be detected. If the output voltage of the DC charging pile is less than the voltage of the battery pack, the charging mode of the charging circuit is determined to be the first DC charging mode; if the output voltage of the DC charging pile is greater than or equal to the voltage of the battery pack, the charging mode of the charging circuit is determined to be the second DC charging mode.

[0161] This embodiment allows the charging mode of the charging circuit to be determined based on the capability of the charging station connected to the charging port.

[0162] When the charging mode is AC charging mode or the first DC charging mode, the charging port is controlled to directly charge the first battery pack, and the charging port is controlled to pulse charge the second battery pack.

[0163] In one embodiment of this disclosure, the method further includes: when the charging mode is a second DC charging mode, controlling the charging port to charge the entire battery pack.

[0164] Controlling the charging port to charge the entire battery pack can be achieved by controlling the first terminal of the energy storage circuit to conduct between the first terminal of the energy storage circuit and the first terminal of the charging port, controlling the first terminal of the energy storage circuit to disconnect from the positive terminal of the first battery pack and the negative terminal of the second battery pack, controlling the second terminal of the energy storage circuit to conduct between the second terminal of the charging port and the negative terminal of the first battery pack, and controlling the third terminal of the energy storage circuit to conduct between the positive terminal of the second battery pack. This allows the DC signal output from the charging port to simultaneously charge the first and second battery packs connected in series through the energy storage circuit.

[0165] When the output voltage of the DC charging pile connected to the charging port is greater than or equal to the voltage of the battery pack, controlling the charging port to charge the entire battery pack can improve the charging efficiency of the battery pack.

[0166] In one embodiment of this disclosure, the method further includes: obtaining a first SOC of the first battery pack and a second SOC of the second battery pack; adjusting the charging frequency of pulse charging the second battery pack according to the first SOC and the second SOC, so that the SOC difference between the first SOC and the second SOC is within a set range.

[0167] The setting range can be preset based on the performance of the battery pack. This setting range can be a SOC range that is greater than zero and less than or equal to the SOC threshold. For example, the setting range can be (0, 1%).

[0168] If the difference between the first SOC and the second SOC is within a set range, the second battery pack 1120 is fully charged first, and during the charging process, the difference between the SOC of the first battery pack 1110 and the second battery pack 1120 is small.

[0169] In this embodiment, if the first battery pack 1110 is fully charged first, it needs to be disconnected, and the charging port will have no capacitive load for voltage regulation. Furthermore, during the pulse charging of the second battery pack, when the control module 1300 controls the first switch T1 to turn off and the second switch T2 to turn on, allowing the inductor L1 to charge and store energy, this can easily cause the charging pile connected to the charging port to detect an abnormality and terminate charging. Therefore, the second battery pack 1120 needs to be fully charged before the first battery pack 1110.

[0170] In addition, in order to prevent a large difference in SOC between the first battery pack 1110 and the second battery pack 1120 at the end of charging, which would affect the power supply effect of the battery pack, the difference in SOC between the first battery pack 1110 and the second battery pack 1120 during the charging process should be small.

[0171] Therefore, by adjusting the charging frequency, this embodiment can control the distribution of the charging current of the first battery pack 1110 and the second battery pack 1120, so that the effective charging current of the second battery pack 1120 is greater than that of the first battery pack 1110, that is, the SOC of the second battery pack 1120 is slightly greater than that of the first battery pack 1110, so that the second battery pack is fully charged first, and the SOC of the first battery pack 1110 and the second battery pack 1120 are relatively close during the charging process.

[0172] In one embodiment of this disclosure, first mapping data reflecting the mapping relationship between SOC and charging frequency can be preset; based on the first SOC, the second SOC and the first mapping data, a target value corresponding to the charging frequency can be obtained.

[0173] The first mapping data can be the first mapping function, or the first lookup table, etc., and is not limited here.

[0174] For the first mapping function, the dependent variable is the charging frequency and the independent variable is the state of charge (SOC). By substituting the first SOC and the second SOC into the first mapping function, the target value of the corresponding charging frequency can be obtained.

[0175] For the first lookup table, the charging frequency corresponding to the first SOC and the second SOC can be found in the first lookup table and used as the target value of the charging frequency.

[0176] In this embodiment, the charging frequency is adjusted according to the first SOC and the second SOC, that is, the charging frequency is adjusted to a target value corresponding to the first SOC and the second SOC, so that the difference between the first SOC and the second SOC is within a set range.

[0177] In this embodiment, when there is a capacity imbalance between the first battery pack and the second battery pack, the charging frequency can be adjusted according to the first SOC and the second SOC to achieve charging current distribution control between the first battery pack and the second battery pack, thereby balancing the capacity of the first battery pack and the second battery pack.

[0178] In the charging circuit, such as Figure 2 In the example shown, the flowchart of the control method for this charging circuit can be as follows: Figure 4 As shown.

[0179] Step S4001: Determine the charging mode of the charging circuit. If the charging mode is the first DC charging mode, execute steps S4101 to S4105. If the charging mode is the second DC charging mode, execute steps S4201 to S4202. If the charging mode is the AC charging mode, execute steps S4301 to S4305.

[0180] Specifically, the charging circuit can determine to enter the DC charging process when it detects that the DC charging port is connected to the charging gun and receives a DC charging handshake interaction signal sent by the DC charging pile connected to the charging gun; and determine to enter the AC charging process when it detects that the AC charging port is connected to the charging gun and receives an AC charging handshake interaction signal sent by the AC charging pile connected to the charging gun.

[0181] When the charging circuit enters the AC charging process, the charging mode of the charging circuit can be determined to be AC ​​charging mode; when the charging circuit enters the DC charging process, the output voltage of the DC charging pile and the voltage of the battery pack can be detected. If the output voltage of the DC charging pile is less than the voltage of the battery pack, the charging mode of the charging circuit is determined to be the first DC charging mode; if the output voltage of the DC charging pile is greater than or equal to the voltage of the battery pack, the charging mode of the charging circuit is determined to be the second DC charging mode.

[0182] Step S4101: Prepare for the first DC charging mode.

[0183] Control the first switch K1, the second switch K2, the third switch K3 and the sixth switch K6 to close, so that the DC charging pile is directly connected to the first battery pack 1110; control the fifth switch K5 to close, and prepare for the charging control of the second battery pack 1120.

[0184] Step S4102: Determine whether the first DC charging mode is ready. If yes, continue with step S4102; otherwise, proceed with step S4103.

[0185] Specifically, it can involve detecting the status of each switch and the charging pile. Once the first switch K1, the second switch K2, the third switch K3, the fifth switch K5, and the sixth switch K6 are all closed, and the charging pile is ready, then the first DC charging mode is confirmed to be ready.

[0186] Step S4103, first DC charging mode charging control.

[0187] The system requests the required charging voltage and current to be sent to the DC charging pile or AC charging module. The required charging voltage is determined based on the voltage of the first battery pack, and the required charging current is determined based on the sum of the allowable charging currents of the first and second battery packs.

[0188] According to the set charging frequency and duty cycle, the first switch T1 of the energy storage circuit 1400 is turned off and the second switch T2 is turned on, so that the inductor L1 is charged and stored. The first switch T1 of the energy storage circuit 1400 is turned on and the second switch T2 is turned off, so that the inductor L1 is discharged to charge the second battery pack 1120.

[0189] The duty cycle is related to the first charging voltage output from the charging port, the voltage of the second battery pack, and the system hardware circuit parameters. The charging frequency is determined based on the initial charging current of the second battery pack.

[0190] Step S4104: Adjust the charging frequency of the second battery pack.

[0191] Adjusting the charging frequency of the second battery pack changes its charging current; that is, the charging current of the second battery pack differs at different charging frequencies. Since the charging port requires a constant charging current, controlling the charging frequency of the second battery pack allows for the distribution and control of the charging current between the first and second battery packs.

[0192] Specifically, the charging current of the first battery pack and the charging current of the second battery pack can be monitored, and the first SOC of the first battery pack and the second SOC of the second battery pack can be calculated respectively. Based on the first SOC and the second SOC, the charging frequency can be controlled to distribute and control the charging current of the first battery pack and the second battery pack, so that the effective charging current of the second battery pack is greater than that of the first battery pack, that is, the SOC of the second battery pack is greater than that of the first battery pack, so that the second battery pack is fully charged first.

[0193] This avoids the problem that when the first battery pack 1110 is fully charged and then disconnected, the charging port has no capacitive load for voltage regulation. During the pulse charging process of the charging port to the second battery pack, when the first switch T1 is turned off and the second switch T2 is turned on to charge and store energy in the inductor L1, the charging pile connected to the charging port may detect an abnormality and terminate the charging.

[0194] Step S4105, End process control of the first DC charging mode.

[0195] When the second battery pack is detected to meet the charging end conditions, the first switch T1 and the second switch T2 in the energy storage circuit 1400 are both turned off, and the fifth switch K5 is also turned off to end the charging process of the second battery pack. When the first battery pack is detected to meet the charging end conditions, the charging current to the charging pile connected to the charging port 1200 is requested to be 0, and the first switch K1, the second switch K2, the third switch K3 and the sixth switch K6 are all turned off to end the charging process of the first battery pack.

[0196] The charging termination condition includes at least one condition: the voltage of the corresponding battery pack reaches the charging cutoff voltage.

[0197] Step S4201, Second DC charging mode charging control.

[0198] Specifically, it can control the second switch K2, the third switch K3, the fifth switch K5, and the sixth switch K6 to close, control the first switch T1 of the energy storage circuit 1400 to turn on and the second switch T2 to turn off, so that the charging pile is directly connected to the entire battery pack and requests charging current from the charging pile to charge the entire battery pack.

[0199] Step S4202, End process control of the second DC charging mode.

[0200] When the battery pack is detected to meet the charging end conditions, the charging current requested from the charging pile connected to the charging port 1200 is 0. The second switch K2, the third switch K3, the fifth switch K5 and the sixth switch K6 are opened, and the first switch T1 and the second switch T2 in the energy storage circuit 1400 are both opened to end the charging process of the battery pack.

[0201] Among them, the charging termination condition includes at least the battery pack voltage reaching the charging cutoff voltage.

[0202] Step S4301, prepare for AC charging mode.

[0203] Control the fourth switch K4 and the sixth switch K6 to close, so that the DC charging pile is directly connected to the first battery pack 1110; control the first switch K1 and the fifth switch K5 to close, and prepare for the charging control of the second battery pack 1120.

[0204] Step S4302: Determine whether the AC charging mode is ready. If yes, continue with step S4302; otherwise, proceed to step S4303.

[0205] Specifically, it can detect the status of each switch and the charging pile. Once the first switch K1, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are all closed and the charging pile is ready, it is determined that the AC charging mode is ready.

[0206] Step S4103, AC charging mode charging control.

[0207] The request for charging voltage and charging current is sent to the DC charging pile or AC charging module.

[0208] The required charging voltage is determined based on the voltage of the first battery pack, and the required charging current is determined based on the sum of the allowable charging current of the first battery pack and the allowable charging current of the second battery pack.

[0209] According to the set charging frequency and duty cycle, the first switch T1 of the energy storage circuit 1400 is turned off and the second switch T2 is turned on, so that the inductor L1 is charged and stored. The first switch T1 of the energy storage circuit 1400 is turned on and the second switch T2 is turned off, so that the inductor L1 is discharged to charge the second battery pack 1120.

[0210] The duty cycle is related to the first charging voltage output from the charging port, the voltage of the second battery pack, and the system hardware circuit parameters. The charging frequency is determined based on the initial charging current of the second battery pack.

[0211] Step S4304: Adjust the charging frequency of the second battery pack.

[0212] Adjusting the charging frequency of the second battery pack changes its charging current; that is, the charging current of the second battery pack differs at different charging frequencies. Since the charging port requires a constant charging current, controlling the charging frequency of the second battery pack allows for the distribution and control of the charging current between the first and second battery packs.

[0213] Specifically, the charging current of the first battery pack and the charging current of the second battery pack can be monitored, and the first SOC of the first battery pack and the second SOC of the second battery pack can be calculated respectively. Based on the first SOC and the second SOC, the charging frequency can be controlled to distribute and control the charging current of the first battery pack and the second battery pack, so that the effective charging current of the second battery pack is greater than that of the first battery pack, that is, the SOC of the second battery pack is greater than that of the first battery pack, so that the second battery pack is fully charged first.

[0214] This avoids the problem that when the first battery pack 1110 is fully charged and then disconnected, the charging port has no capacitive load for voltage regulation. During the pulse charging process of the charging port to the second battery pack, when the first switch T1 is turned off and the second switch T2 is turned on to charge and store energy in the inductor L1, the charging pile connected to the charging port may detect an abnormality and terminate the charging.

[0215] Step S4305, AC charging mode termination process control.

[0216] When the second battery pack is detected to meet the charging end conditions, the first switch T1 and the second switch T2 in the energy storage circuit 1400 are both turned off, and the first switch K1 and the fifth switch K5 are also turned off to end the charging process of the second battery pack. When the first battery pack is detected to meet the charging end conditions, the charging current to the charging pile connected to the charging port 1200 is requested to be 0, and the fourth switch K4 and the sixth switch K6 are turned off to end the charging process of the first battery pack.

[0217] <Vehicle Example>

[0218] This embodiment provides a vehicle, which in one aspect may include the aforementioned charging circuit 1000.

[0219] On the other hand, such as Figure 5 As shown, the vehicle 5000 may include a processor 5100 and a memory 5200. The memory 5200 is used to store a computer program, and the processor 5100 is used to control the vehicle to execute the charging control method of any embodiment of this disclosure under the control of the computer program.

[0220] The processor 5100, as the main component of the vehicle's Electronic Control Unit (ECU), is used to execute computer programs, which can be written using instruction sets based on architectures such as x37, Arm, RISC, MIPS, and SSE.

[0221] The memory 5200 includes, for example, ROM (Read-Only Memory), RAM (Random Access Memory), and non-volatile memory such as a hard disk, for storing the above computer programs, etc.

[0222] The vehicle in this embodiment can be a vehicle equipped with a power battery, specifically a pure electric vehicle or a hybrid vehicle.

[0223] In one example, the vehicle may also have at least one of other hardware structures such as an engine, a motor controller, a sensing device, an input device, an interface device, an output device, a motor, and a power battery, which are not limited here.

[0224] The rear end of the engine (the end connected to the flywheel) can be connected to the input end of the reducer via a clutch, and the output end of the reducer is connected to the tire axle, so that the engine can drive the tire to rotate.

[0225] The motor controller is used to control the motor's operation according to the control instructions sent by the processor 5100. For example, it controls the motor's output torque to drive the tire axle to rotate; or it controls the motor to feed electrical energy back to the power battery.

[0226] The sensing device may include various sensors, such as at least one of a speed sensor, attitude sensor, temperature sensor, humidity sensor, pressure sensor, etc.

[0227] Input devices may include button circuits, touch screens, microphones, knob circuits, throttle control devices with accelerator pedals, brake control devices with brake pedals, and so on.

[0228] Interface devices may include headphone jacks, diagnostic interfaces for on-board diagnostics (OBD) systems, charging interfaces, USB interfaces, etc.

[0229] Output devices may include displays, speakers, various indicator lights, etc.

[0230] When the motor is used as an electric motor, the power battery can be used to provide electrical energy to the motor.

[0231] <Example of a readable storage medium>

[0232] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the charging control method described in any of the method embodiments of this disclosure.

[0233] This invention can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of the invention.

[0234] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0235] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0236] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0237] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0238] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0239] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0240] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. It will be known to those skilled in the art that implementation in hardware, implementation in software, and implementation using a combination of software and hardware are equivalent.

[0241] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A charging circuit, characterized in that, The device includes a battery pack, a charging port, and an energy storage circuit. The battery pack includes a first battery pack and a second battery pack connected in series. The first battery pack is connected to the charging port, and the energy storage circuit is connected between the charging port and the second battery pack.

2. The charging circuit according to claim 1, characterized in that, The charging port is configured to directly charge the first battery pack when the charging mode of the charging circuit is AC charging mode or the first DC charging mode, and to pulse charge the second battery pack through the energy storage circuit.

3. The charging circuit according to claim 2, characterized in that, The charging port is configured to charge the entire battery pack via the energy storage circuit when the charging mode is the second DC charging mode.

4. The charging circuit according to claim 3, characterized in that, The charging circuit also includes a control module, which is further configured to: If the charging port is detected to be connected to an AC charging pile, the charging mode is determined to be AC ​​charging mode. If it is detected that the charging port is connected to a DC charging pile and the output voltage of the DC charging pile is less than the voltage of the battery pack, the charging mode is determined to be the first DC charging mode. If the charging port is detected to be connected to a DC charging pile and the output voltage of the DC charging pile is greater than or equal to the voltage of the battery pack, the charging mode is determined to be the second DC charging mode.

5. The charging circuit according to claim 2, characterized in that, The first end of the energy storage circuit is connected to the first end of the charging port, the negative terminal of the second battery pack, and the positive terminal of the first battery pack. The second end of the energy storage circuit is connected to the second end of the charging port and the negative terminal of the first battery pack. The third end of the energy storage circuit is connected to the positive terminal of the second battery pack.

6. The charging circuit according to claim 5, characterized in that, The energy storage circuit includes a first switching transistor, a second switching transistor, a capacitor, and an inductor. The first switching transistor and the second switching transistor are connected in series between the second and third terminals of the energy storage circuit. The capacitor is connected between the second and third terminals of the energy storage circuit. The inductor is connected between the first terminal of the energy storage circuit and a first potential point, where the first potential point is the potential point between the first switching transistor and the second switching transistor.

7. The charging circuit according to claim 6, characterized in that, The charging circuit also includes a control module, which is further configured to: acquire a set charging frequency and duty cycle, and control the switching of the first switch and the second switch according to the charging frequency and the duty cycle, so that the charging port can pulse charge the second battery pack through the energy storage circuit.

8. The charging circuit according to claim 7, characterized in that, The control module is further configured to: acquire the first SOC of the first battery pack and the second SOC of the second battery pack, and adjust the charging frequency according to the first SOC and the second SOC so that the difference between the first SOC and the second SOC is within a set range.

9. The charging circuit according to claim 5, characterized in that, The charging circuit also includes a first switch, which is connected between the first terminal of the energy storage circuit and the negative terminal of the second battery pack. When the charging mode is AC charging mode or first DC charging mode, the first switch is turned on so that the charging port can pulse charge the second battery pack through the energy storage circuit.

10. The charging circuit according to claim 5, characterized in that, The charging port includes a DC charging port, a second switch, and a third switch. The second switch is connected between the first terminal of the energy storage circuit and the positive terminal of the DC charging port, and the third switch is connected between the second input terminal of the energy storage circuit and the negative terminal of the DC charging port. The second switch and the third switch are turned on when the charging mode is either the first DC charging mode or the second DC charging mode.

11. The charging circuit according to claim 5, characterized in that, The charging port includes an AC charging port, and the charging circuit further includes an AC charging module and a fourth switch. The input terminal of the AC charging module is connected to the AC charging port; the fourth switch is connected between the positive output terminal of the AC charging module and the first terminal of the energy storage circuit, and the negative output terminal of the AC charging module is connected to the second terminal of the energy storage circuit. The AC charging module is configured to convert the AC signal input to the AC charging port into a DC signal when the charging mode is AC charging mode. The fourth switch is turned on when the charging mode is AC charging mode, so that the DC signal output by the AC charging module can directly charge the first battery pack and pulse charge the second battery pack through the energy storage circuit.

12. The charging circuit according to claim 5, characterized in that, The charging circuit also includes a fifth switch and a sixth switch. The sixth switch is connected between the third terminal of the energy storage circuit and the positive terminal of the second battery pack, and the fifth switch is connected between the negative terminal of the first battery pack and the second terminal of the energy storage circuit. The fifth switch and the sixth switch are turned on when the charging mode is the first DC charging mode, the AC charging mode, or the second DC charging mode.

13. The charging circuit according to claim 5, characterized in that, At least one component in the energy storage circuit is reused with the vehicle's motor controller.

14. A charging control method, characterized in that, include: Control the charging port to charge the first battery pack of the battery pack; The charging port is controlled to perform pulse charging on the second battery pack of the battery pack through the energy storage circuit.

15. The charging control method according to claim 14, characterized in that, The charging control method further includes: Determine the charging mode of the battery pack; When the charging mode is AC charging mode or the first DC charging mode, the charging port is controlled to directly charge the first battery pack, and the charging port is controlled to pulse charge the second battery pack through the energy storage circuit.

16. The charging control method according to claim 15, characterized in that, The charging control method further includes: When the charging mode is the second DC charging mode, the charging port is controlled to charge the first battery pack and the second battery pack as a whole.

17. The charging control method according to claim 15, characterized in that, Determining the charging mode of the battery pack includes: If the charging port is detected to be connected to an AC charging pile, the charging mode is determined to be AC ​​charging mode. If it is detected that the charging port is connected to a DC charging pile and the output voltage of the DC charging pile is less than the voltage of the battery pack, the charging mode is determined to be the first DC charging mode. If the charging port is detected to be connected to a DC charging pile and the output voltage of the DC charging pile is greater than or equal to the voltage of the battery pack, the charging mode is determined to be the second DC charging mode.

18. The charging control method according to claim 14, characterized in that, The control of the charging port to pulse charge the second battery pack of the battery pack through the energy storage circuit includes: During the first time period of any charging cycle, the charging port is controlled to charge the energy storage circuit; During the second time period of any charging cycle, the energy storage circuit is controlled to discharge through the second battery pack to charge the second battery pack.

19. The charging control method according to claim 14, characterized in that, The charging control method further includes: Obtain the first SOC of the first battery pack and the second SOC of the second battery pack; The charging frequency for pulse charging of the second battery pack is adjusted based on the first SOC and the second SOC, so that the SOC difference between the first SOC and the second SOC is within a set range.

20. A vehicle, characterized in that, Includes the charging circuit according to any one of claims 1 to 13.

21. A vehicle, characterized in that, It includes a processor and a memory, the memory being used to store a computer program, and the processor being used, under the control of the computer program, to execute the charging control method as described in any one of claims 14 to 19.

22. A computer-readable storage medium having a computer program stored thereon, the computer program implementing the charging control method as described in any one of claims 14 to 19 when executed by a processor.

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