Charging circuit and vehicle

Abstract

A charging circuit (10), configured to be electrically connected to an external charging station. The charging circuit (10) comprises at least two charging modules (101, 102), and the at least two charging modules (101, 102) are configured to perform voltage-conversion charging on a battery (E) at least twice.

Description

Charging circuit and vehicle

[0001] Priority information

[0002] The present disclosure claims priority to and the benefit of the patent application with the patent application number 202411999297.7 filed on December 31, 2024 with the China National Intellectual Property Office, and incorporates it herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of vehicle power supply, in particular to a charging circuit and a vehicle. BACKGROUND

[0004] In related research, in order to adapt the demand voltage of the vehicle to the external charging voltage, a charging circuit is usually set to perform voltage step-up or step-down. However, at present, the charging circuit is mostly for single-step voltage step-up or step-down of the external charging voltage. When the pressure difference between the demand voltage of the electric vehicle and the external charging voltage is large, single-step voltage step-up or step-down will face a large charging voltage difference, which will cause serious heating problem, and limit the compatibility of the vehicle to charging piles of different voltage platforms. SUMMARY

[0005] The present disclosure provides a charging circuit and a vehicle, aiming to expand the voltage adjustment range of the charging circuit, improve the compatibility of the charging circuit to charging piles of different voltage platforms, and reduce the heating and loss problems.

[0006] In a first aspect, the present disclosure provides a charging circuit, which is adapted to be electrically connected to an external charging pile.

[0007] The charging circuit comprises at least two charging modules, and the at least two charging modules are configured to perform at least two times of voltage conversion charging on the battery.

[0008] In some embodiments, the at least two charging modules are configured to perform at least two times of voltage conversion charging on the battery, comprising:

[0009] The at least two charging modules are configured to perform at least two times of voltage conversion charging on the battery in sequence.

[0010] In some embodiments, the voltage conversion charging comprises voltage step-up charging and / or voltage step-down charging.

[0011] In some embodiments, the at least two charging modules have the same circuit structure.

[0012] In some embodiments, the at least two charging modules comprise a first charging module and a second charging module, and the first charging module and the second charging module are configured to perform two times of voltage conversion charging on the battery in sequence.

[0013] In some embodiments, the charging circuit further comprises a first switch module for controlling the first charging module and the second charging module to sequentially perform twice voltage transformation charging on the battery.

[0014] In some embodiments, the first switch module comprises a first switch and a second switch.

[0015] The first end of the first switch is adapted to be electrically connected with the first end of the external charging pile, and the second end of the first switch is electrically connected with the first connecting end of the first charging module, the first end of the second switch is electrically connected with the second connecting end of the first charging module, and the second end of the second switch is electrically connected with the first connecting end of the second charging module.

[0016] The second connecting end of the second charging module is electrically connected with the first electrode of the battery.

[0017] The second electrode of the battery, the third connecting end of the first charging module and the third connecting end of the second charging module are electrically connected with each other and are adapted to be electrically connected with the second end of the external charging pile.

[0018] In some embodiments, when performing twice voltage transformation charging on the battery, the first switch and the second switch are controlled to be turned on.

[0019] In some embodiments, the first charging module and the second charging module each comprise an inductor, an upper bridge arm and a lower bridge arm, and the first end of the inductor serves as the first connecting end, the second end of the inductor is electrically connected with the first end of the upper bridge arm and the first end of the lower bridge arm, the second end of the upper bridge arm serves as the second connecting end, and the second end of the lower bridge arm serves as the third connecting end.

[0020] In the first time period of performing twice voltage transformation charging on the battery, the upper bridge arm and the lower bridge arm of the first charging module and the lower bridge arm of the second charging module are further controlled to be turned on, and in the second time period of performing twice voltage transformation charging on the battery, the upper bridge arm of the first charging module and the upper bridge arm of the second charging module are further controlled to be turned on.

[0021] In some embodiments, the first switch module further comprises a third switch and a fourth switch.

[0022] The first end of the third switch is adapted to be electrically connected with the first end of the external charging pile, the second end of the third switch is electrically connected with the second connecting end of the first charging module, the first end of the fourth switch is electrically connected with the second connecting end of the first charging module, and the second end of the fourth switch is electrically connected with the second connecting end of the second charging module.

[0023] In some embodiments, the first switch module further includes at least one of a fifth switch and a sixth switch;

[0024] The first end of the fifth switch is electrically connected to the second connection end of the second charging module, and the second end of the fifth switch is electrically connected to the first electrode of the battery.

[0025] The first end of the sixth switch is electrically connected to the second electrode of the battery, and the second end of the sixth switch is electrically connected to the third connection end of the second charging module.

[0026] In some embodiments, a first capacitor and / or a second capacitor may also be included;

[0027] The first capacitor is electrically connected to the first terminal of the first switch and the third terminal of the first charging module, respectively, and the second capacitor is electrically connected to the first terminal of the second switch and the third terminal of the second charging module, respectively.

[0028] In some embodiments, the first switch module further includes an eighth switch;

[0029] The first end of the eighth switch is electrically connected to the second connection end of the second charging module, and the second end of the eighth switch is electrically connected to the first electrode of the battery.

[0030] In some embodiments, the first switch module further includes:

[0031] The seventh switch has its first end electrically connected to the second connection end of the first charging module, and its second end electrically connected to the first electrode of the battery.

[0032] In some embodiments, when the battery is subjected to a second boost charge, the first switch and the second switch are controlled to be turned on.

[0033] In some embodiments, both the first charging module and the second charging module include an inductor, an upper bridge arm, and a lower bridge arm, wherein the first end of the inductor serves as the first connection end, the second end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm, the second end of the upper bridge arm serves as the second connection end, and the second end of the lower bridge arm serves as the third connection end.

[0034] During the first time period of performing two boost charging cycles on the battery, the upper and lower bridge arms of the first charging module and the lower bridge arm of the second charging module are also controlled to be turned on. During the second time period of performing two boost charging cycles on the battery, the eighth switch, the upper bridge arm of the first charging module, and the upper bridge arm of the second charging module are also controlled to be turned on.

[0035] In some embodiments, a ninth switch is also included;

[0036] The first end of the ninth switch is electrically connected to the second electrode of the battery, and the second end of the ninth switch is electrically connected to the third connection end of the second charging module.

[0037] In some embodiments, the first switch module further includes a tenth switch and an eleventh switch;

[0038] The first end of the tenth switch is electrically connected to the first connection end of the first charging module, and the second end of the tenth switch is electrically connected to the second connection end of the second charging module.

[0039] The first end of the eleventh switch is electrically connected to the first connection end of the second charging module, and the second end of the eleventh switch is electrically connected to the first electrode of the battery.

[0040] In some embodiments, the tenth and eleventh switches are turned on when the battery is subjected to two buck charging cycles.

[0041] In some embodiments, both the first charging module and the second charging module include an inductor, an upper bridge arm, and a lower bridge arm, wherein the first end of the inductor serves as the first connection end, the second end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm, the second end of the upper bridge arm serves as the second connection end, and the second end of the lower bridge arm serves as the third connection end.

[0042] During the first time period of performing two step-down charging cycles on the battery, the third switch is also controlled to turn on the upper bridge arm of the first charging module and the upper bridge arm of the second charging module; and during the second time period of performing two step-down charging cycles on the battery, the lower bridge arm of the first charging module and the upper and lower bridge arms of the second charging module are also controlled to turn on.

[0043] In some embodiments, the first switch module includes a thirteenth switch, a fifteenth switch, and a sixteenth switch;

[0044] The first end of the thirteenth switch is adapted to be electrically connected to the first end of the external charging pile, and the second end of the thirteenth switch is electrically connected to the second connection end of the first charging module.

[0045] The first end of the fifteenth switch is electrically connected to the first connection end of the first charging module, the second end of the fifteenth switch is electrically connected to the second connection end of the second charging module, the first end of the sixteenth switch is electrically connected to the first connection end of the second charging module, and the second end of the sixteenth switch is electrically connected to the first electrode of the battery.

[0046] The second electrode of the battery, the third connection terminal of the first charging module, and the third connection terminal of the second charging module are electrically connected to each other, and are all suitable for electrical connection to the second end of the external charging pile.

[0047] In some embodiments, the first switch module further includes at least one of a fourteenth switch, a seventeenth switch, and an eighteenth switch;

[0048] The first terminal of the fourteenth switch is electrically connected to the second terminal of the first charging module, and the second terminal of the fourteenth switch is electrically connected to the second connection terminal of the second charging module;

[0049] The first terminal of the seventeenth switch is electrically connected to the first terminal of the fourteenth switch, and the second terminal of the seventeenth switch is electrically connected to the first electrode of the battery;

[0050] The first end of the eighteenth switch is electrically connected to the second electrode of the battery, and the second end of the eighteenth switch is electrically connected to the third connection end of the second charging module.

[0051] In some embodiments, the fifteenth and sixteenth switches are turned on during a second step-down charge of the battery.

[0052] In some embodiments, both the first charging module and the second charging module include an inductor, an upper bridge arm, and a lower bridge arm, and the first end of the inductor serves as the first connection end, the first end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm, the second end of the upper bridge arm serves as the second connection end, and the second end of the lower bridge arm serves as the third connection end.

[0053] During the first time period of performing two step-down charging cycles on the battery, the thirteenth switch, the upper bridge arm of the first charging module, and the upper bridge arm of the second charging module are also controlled to be turned on. During the second time period of performing two step-down charging cycles on the battery, the lower bridge arm of the first charging module, and the upper and lower bridge arms of the second charging module are also controlled to be turned on.

[0054] In some embodiments, at least two charging modules include a third charging module, a fourth charging module, and a fifth charging module, wherein the third charging module, the fourth charging module, and the fifth charging module are configured to perform three sequential voltage-changing charges on the battery.

[0055] In some embodiments, the charging circuit further includes a second switch module, which is used to control the third charging module, the fourth charging module and the fifth charging module to perform three voltage transformation charges on the battery in sequence.

[0056] In some embodiments, the second switch module includes a nineteenth switch, a twentieth switch, a twenty-first switch, a twenty-second switch, a twenty-third switch, and a twenty-fourth switch;

[0057] The first end of the nineteenth switch is adapted to be electrically connected to the first end of the first external charging pile, and the second end of the nineteenth switch is electrically connected to the second connection end of the third charging module; the first end of the twentieth switch is electrically connected to the first connection end of the third charging module, and the second end of the twentieth switch is electrically connected to the second connection end of the fourth charging module; the first end of the twenty-first switch is electrically connected to the first connection end of the fourth charging module, and the second end of the twenty-first switch is electrically connected to the second connection end of the fifth charging module; the first end of the twenty-second switch is electrically connected to the first connection end of the fifth charging module, and the second end of the twenty-second switch is electrically connected to the first electrode of the battery.

[0058] The first end of the twenty-third switch is adapted to be electrically connected to the first end of the second charging pile, the second end of the twenty-third switch is electrically connected to the first connection end of the fifth charging module, the first end of the twenty-fourth switch is electrically connected to the second connection end of the third charging module, and the second end of the twenty-fourth switch is electrically connected to the first electrode of the battery.

[0059] The second electrode of the battery, the third connection terminal of the third charging module, the third connection terminal of the fourth charging module, and the third connection terminal of the fifth charging module are electrically connected to each other, and are all adapted to be electrically connected to the second end of the first external charging pile and the second end of the second external charging pile.

[0060] In some embodiments, the twentieth switch, the twenty-first switch, and the twenty-second switch are turned on during three buck charging cycles of the battery.

[0061] In some embodiments, the third charging module, the fourth charging module, and the fifth charging module each include an inductor, an upper bridge arm, and a lower bridge arm, and the first end of the inductor serves as the first connection end, the first end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm, the second end of the upper bridge arm serves as the second connection end, and the second end of the lower bridge arm serves as the third connection end;

[0062] During the first time period of the battery undergoing three step-down charging cycles, the nineteenth switch, the upper bridge arm of the third charging module, the upper bridge arm of the fourth charging module, and the upper bridge arm of the fifth charging module are also controlled to be turned on. During the second time period of the battery undergoing three step-down charging cycles, the lower bridge arm of the third charging module, the upper and lower bridge arms of the fourth charging module, and the upper and lower bridge arms of the fifth charging module are also controlled to be turned on.

[0063] In some embodiments, the twentieth switch, the twenty-first switch, and the twenty-third switch are turned on during three boost charging cycles of the battery.

[0064] In some embodiments, the third charging module, the fourth charging module, and the fifth charging module each include an inductor, an upper bridge arm, and a lower bridge arm, and the first end of the inductor serves as the first connection end, the first end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm, the second end of the upper bridge arm serves as the second connection end, and the second end of the lower bridge arm serves as the third connection end;

[0065] During the first time period of performing three boost charging cycles on the battery, the upper and lower bridge arms of the fifth charging module, the upper and lower bridge arms of the fourth charging module, and the lower bridge arm of the third charging module are also controlled to be turned on. During the second time period of performing three boost charging cycles on the battery, the twenty-fourth switch is also controlled to turn on the upper bridge arms of the fifth charging module, the fourth charging module, and the third charging module.

[0066] Secondly, this disclosure also provides a vehicle that includes the charging circuit described in any of the embodiments of the first aspect above.

[0067] Because this charging circuit includes at least two charging modules, these modules work together to perform at least two voltage transformations to charge the battery. Based on this, with a fixed voltage difference between the step-up and step-down voltages of each charging module, the two voltage transformations result in a larger voltage difference, allowing it to adapt to a wider range of charging voltages and thus more types of charging stations, improving compatibility with different charging stations. This expands the application range, making it suitable for charging more electric vehicles and different types of charging stations, ensuring reliable operation and charging efficiency. Alternatively, with a fixed voltage difference between the battery's required voltage and the charging voltage provided by the external charging station, the two voltage transformations reduce the voltage difference between the step-up and step-down voltages of each charging module, thereby reducing losses, mitigating heat generation, and ultimately improving system safety and reliability.

[0068] Additional aspects and advantages of embodiments of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this disclosure. Attached Figure Description

[0069] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0070] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0071] Figure 1 is a schematic diagram of the circuit structure of a charging circuit provided in an embodiment of this disclosure;

[0072] Figure 2 is a topology diagram of a charging circuit provided in an embodiment of this disclosure;

[0073] Figure 3 is a schematic diagram of the working state of the charging circuit shown in Figure 2 configured for independent boost charging of the first charging module.

[0074] Figure 4 is a schematic diagram of the working state of the charging circuit shown in Figure 2 configured for independent boost charging of the second charging module.

[0075] Figure 5 is a schematic diagram of the charging circuit shown in Figure 2 configured for two boost charging operations.

[0076] Figure 6 is a schematic diagram of the charging circuit shown in Figure 2 configured for two boost charging operations.

[0077] Figure 7 is a topology diagram of another charging circuit provided in an embodiment of this disclosure;

[0078] Figure 8 is a topology diagram of another charging circuit provided in an embodiment of this disclosure;

[0079] Figure 9 is a schematic diagram of the working state of the charging circuit shown in Figure 8 configured for independent boost charging of the first charging module.

[0080] Figure 10 is a schematic diagram of the second working state of the charging circuit shown in Figure 8, configured as the first charging module for independent boost charging.

[0081] Figure 11 is a schematic diagram of the working state of the charging circuit shown in Figure 8 configured for independent boost charging of the second charging module.

[0082] Figure 12 is a schematic diagram of the working state of the charging circuit shown in Figure 8 configured as the second charging module for independent boost charging.

[0083] Figure 13 is a schematic diagram of the charging circuit shown in Figure 8 configured for two boost charging operations.

[0084] Figure 14 is a schematic diagram of the second working state of the charging circuit shown in Figure 8 configured for two boost charging cycles.

[0085] Figure 15 is a schematic diagram of the working state of the charging circuit shown in Figure 8 configured as the first charging module independently step-down charging.

[0086] Figure 16 is a schematic diagram of the second working state of the charging circuit shown in Figure 8, configured as the first charging module independently step-down charging.

[0087] Figure 17 is a schematic diagram of the working state of the charging circuit shown in Figure 8 configured as the second charging module for independent step-down charging.

[0088] Figure 18 is a schematic diagram of the second working state of the charging circuit shown in Figure 8 configured as the second charging module for independent step-down charging.

[0089] Figure 19 is a schematic diagram of the charging circuit shown in Figure 8 configured for two buck charging operations.

[0090] Figure 20 is a schematic diagram of the second working state of the charging circuit shown in Figure 8 configured for two buck charging cycles.

[0091] Figure 21 is a schematic diagram of the self-heating working state of the charging circuit shown in Figure 8.

[0092] Figure 22 is a schematic diagram of the self-heating working state of the charging circuit shown in Figure 8;

[0093] Figure 23 is a schematic diagram of the self-heating working state of the charging circuit shown in Figure 8.

[0094] Figure 24 is a schematic diagram of the self-heating working state of the charging circuit shown in Figure 8.

[0095] Figure 25 is a topology diagram of another charging circuit provided in an embodiment of this disclosure;

[0096] Figure 26 is a schematic diagram of the charging circuit shown in Figure 25 configured for two buck charging operations.

[0097] Figure 27 is a schematic diagram of the second working state of the charging circuit shown in Figure 25 configured for two buck charging cycles.

[0098] Figure 28 is a topology diagram of another charging circuit provided in an embodiment of this disclosure;

[0099] Figure 29 is a schematic diagram of the charging circuit shown in Figure 28 configured for three-stage step-down charging.

[0100] Figure 30 is a schematic diagram of the charging circuit shown in Figure 28 configured for three-stage step-down charging operation.

[0101] Figure 31 is a schematic diagram of the charging circuit shown in Figure 29 configured for three boost charging operations.

[0102] Figure 32 is a schematic diagram of the charging circuit shown in Figure 28 configured for three boost charging operations.

[0103] Figure 33 is a structural schematic diagram of a vehicle provided in an embodiment of this disclosure. Detailed Implementation

[0104] The embodiments of this disclosure are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this disclosure, and should not be construed as limiting the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0105] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0106] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0107] In describing some embodiments, the term "connection" and its derivative expressions may be used. The term "connection" should be interpreted broadly; for example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. For example, in describing some embodiments, the term "connection" may be used to indicate that two or more components have direct physical or electrical contact with each other.

[0108] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0109] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure.

[0110] With the rise of the new energy vehicle industry, large numbers of new energy vehicles are entering households, and public DC charging stations are also developing rapidly. Different models of electric vehicles are compatible with different charging voltages, and different charging stations also provide different charging voltages. For example, the charging voltage provided by charging stations is currently mainly in the range of 500V to 750V. In order to meet the different charging voltage requirements of different electric vehicle models, more and more step-up and step-down charging solutions have been proposed and applied to electric vehicles.

[0111] However, in related studies, the voltage boosting or bucking range of the charging circuit in the buck-boost charging scheme is limited. When the voltage difference between the electric vehicle's required voltage and the charging voltage provided by the charging pile is large, there may be a problem of charging circuit failure. In addition, a large voltage difference between the buck and boost of the charging circuit will also cause greater losses and lead to more serious heat generation problems, which may affect the safety and reliability of the system in severe cases.

[0112] To address the aforementioned problems, in a first aspect, this disclosure provides a charging circuit suitable for electrically connecting to an external charging station.

[0113] The charging circuit includes at least two charging modules configured to perform at least two voltage-controlled charging operations on the battery.

[0114] In some embodiments, the above-mentioned "configured to perform at least two buck charging operations on the battery" may include: being configured to perform at least two boost charging operations on the battery, and / or being configured to perform at least two buck charging operations on the battery.

[0115] Each charging module can perform buck-boost functions. With proper control, each charging module can work independently and charge the battery by transforming the charging voltage provided by the charging pile. Therefore, each charging module can be configured to charge the battery independently; or, at least two charging modules can work together to charge the battery by transforming the charging voltage provided by the charging pile twice.

[0116] For example, with a fixed voltage difference between the step-up and step-down voltages of each charging module, two voltage transformations can increase the voltage difference between the step-up and step-down voltages of the charging circuit. This allows it to adapt to a wider range of charging voltages, meaning it can be compatible with more types of charging piles, improving compatibility with different charging piles. This charging circuit expands its application range, making it suitable for charging more models of electric vehicles with different types of charging piles, which helps ensure reliable operation of the charging circuit and charging effect.

[0117] Alternatively, when the voltage difference between the battery's required voltage and the charging voltage provided by the charging pile is constant, charging the battery through two voltage transformations can reduce the voltage difference between the step-up and step-down voltages of each charging module. This can reduce losses, alleviate heat generation issues, and thus improve system safety and reliability. In some embodiments, the at least two charging modules described above can be configured to operate sequentially, thereby configuring the battery to undergo at least two voltage transformations in the above embodiments. Specifically, this configuration allows for at least two sequential voltage transformations of the battery, which simplifies circuit design and improves the convenience of circuit control.

[0118] In addition to working together to complete at least two voltage charging cycles, the above-mentioned at least two charging modules can also be configured to charge independently, thereby adapting to more application scenarios and the voltage environment of charging piles.

[0119] In some embodiments, at least one of the charging modules may also be configured to heat the battery.

[0120] Due to external environmental factors, when the ambient temperature of the power battery in an electric vehicle is below -10°C, the activity of the battery's positive and negative electrode materials and electrolyte will decrease, resulting in a significant drop in the battery's charging and discharging performance. In this embodiment, using at least one charging module to heat the battery can effectively prevent battery performance degradation, thereby avoiding problems such as insufficient power in the electric vehicle caused by battery performance degradation.

[0121] In this embodiment, through reasonable configuration of the charging module, the battery can be charged even when there is a large voltage difference between the battery's required voltage and the charging voltage provided by the charging pile, while also enabling the battery to self-heat. This charging circuit achieves compatibility between buck-boost charging and self-heating functions, improving the utilization rate of the charging circuit. It can maximize the use of the charging pile's charging power according to different charging needs, and the battery's self-heating function can effectively reduce damage to the battery in low-temperature environments.

[0122] In some embodiments, the circuit structures of the at least two charging modules can be designed to have the same circuit structure or to have different circuit structures. Having the same circuit structure reduces design complexity, and the control methods and parameters of each charging module can be identical, thus facilitating subsequent control.

[0123] As exemplarily shown in Figures 1 to 3, Figure 1 is a schematic diagram of the circuit structure of a charging circuit provided in an embodiment of the present disclosure, Figure 2 is a topology diagram of a charging circuit provided in an embodiment of the present disclosure, and Figure 3 is a schematic diagram of a working state of the charging circuit shown in Figure 2.

[0124] In this embodiment of the disclosure, the number of charging modules can be any number, such as two, three, or four. In addition to the charging modules mentioned above, a switch module can also be set in the charging circuit. The switch module can be set with different numbers of switches according to the actual control requirements, so that the control of the charging modules can enable them to work independently or work together. The following embodiments of this disclosure will introduce embodiments including two charging modules and three charging modules.

[0125] For example, in an application scenario that includes two charging modules, as shown in Figure 1, the above-mentioned at least two charging modules include a first charging module 101 and a second charging module 102. The first charging module 101 and the second charging module 102 can be configured to perform two voltage-changing charging operations on the battery in sequence, that is, two boost charging operations and two buck charging operations, or one of the charging modules can be used alone. Voltage-changing charging can include boost charging and / or buck charging, as can be described in the following embodiments.

[0126] In some cases, the charging circuit described above also includes a first switching module, wherein the first switching module is used to control the first charging module 101 and the second charging module 102 to perform two sequential voltage conversion charging of the battery.

[0127] For example, the charging module in this embodiment of the present disclosure can be as shown in FIG1. ​​Each charging module includes six transistors and three inductors, with the three inductors connected in a star configuration. The star junction is the first connection terminal of the charging module. The aforementioned transistors and inductors can respectively form a three-phase buck-boost circuit. Each phase buck-boost circuit includes one inductor and two transistors connected in series, with one transistor located on the upper bridge arm and the other on the lower bridge arm. The transistors can be bipolar transistors, MOSFETs, or other types of transistors. The specific type of transistor selected can be adjusted according to the actual situation, and this disclosure does not make specific limitations. Taking a motor assembly as an example, the inductor here can be understood as a winding coil. In some embodiments, the charging module also includes a bus capacitor C0, which is used to decouple and isolate the three-phase buck-boost circuit.

[0128] In each charging module, one of the first connection terminal D1 and the second connection terminal D2 can be connected to an external charging pile to receive the charging voltage provided by the charging pile, while the other can be connected to the battery to charge the battery using the transformed voltage. The third connection terminal D3 can be understood as the ground terminal in the circuit system, used to form a closed loop. The two ends of the aforementioned bus capacitor C0 are electrically connected to the second connection terminal and the third connection terminal of the charging module, respectively.

[0129] Taking Figure 1 as an example, the direction from the first connection terminal D1 to the second connection terminal D2 is the boost direction, and correspondingly, the direction from the second connection terminal D2 to the first connection terminal D1 is the buck direction. Furthermore, for the specific charging module circuit structure shown in Figure 2, the first end of the inductor is the aforementioned first connection terminal D1, while the second end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm. The second end of the upper bridge arm serves as the second connection terminal D2, and the second end of the lower bridge arm serves as the third connection terminal D3. Other embodiments of this disclosure are also applicable.

[0130] Figure 2 is a topology diagram of a charging circuit provided in an embodiment of this disclosure. Figure 3 is a schematic diagram of the working state of the charging circuit shown in Figure 2 configured for independent boost charging of the first charging module. Figure 4 is a schematic diagram of the working state of the charging circuit shown in Figure 2 configured for independent boost charging of the second charging module. Figure 5 is a schematic diagram of the working state of the charging circuit shown in Figure 2 configured for two boost charging operations. Figure 6 is a schematic diagram of the working state of the charging circuit shown in Figure 2 configured for two boost charging operations.

[0131] In some embodiments, as shown in FIG2, at least two charging modules include a first charging module 101 and a second charging module 102; the first switch module may include a first switch K1 and a second switch K2, and optionally, may also include a third switch K3 and a fourth switch K4.

[0132] The first end of the first switch K1 is adapted to be electrically connected to the first end of the external charging pile, and can be used as the charging input end of the charging circuit. The second end of the first switch K1 is electrically connected to the first connection end of the first charging module 101.

[0133] The first end of the second switch K2 is electrically connected to the second connection end of the first charging module 101, and the second end of the second switch K2 is electrically connected to the first connection end of the second charging module 102.

[0134] When the first switch K1 and the second switch K2 are turned on at the same time, the first charging module 101 and the second charging module 102 can be connected in series. When the two work at the same time, two voltage transformations can be achieved.

[0135] The first end of the third switch K3 is adapted to be electrically connected to the first end of the external charging pile, and the second end of the third switch K3 is electrically connected to the second connection end of the first charging module 101.

[0136] The first end of the fourth switch K4 is electrically connected to the second connection end of the first charging module 101, and the second end of the fourth switch K4 is electrically connected to the second connection end of the second charging module 102.

[0137] When the third switch K3 is turned on, it can be considered as short-circuiting the first charging module 101, meaning that the first charging module 101 is no longer engaged in buck-boost operation. Similarly, when the fourth switch K4 is turned on, it can be considered as short-circuiting the second charging module 102, meaning that the second charging module 102 is no longer engaged in buck-boost operation.

[0138] As shown in Figure 2, the second connection terminal of the second charging module 102 is electrically connected to the first electrode of the battery E, and the second electrode of the battery E, the third connection terminal of the first charging module 101, and the third connection terminal of the second charging module 102 are electrically connected to each other, and all are suitable for electrical connection to the second end of the charging pile. By reasonably configuring the on and off states of the four switches from the first switch K1 to the fourth switch K4, the charging circuit can be controlled to switch between different boost charging working states.

[0139] As shown in Figure 2, when the third switch K3 and the fourth switch K4 are turned on at the same time, direct charging between the charging pile and the battery can be realized. This function is also present in other embodiments provided in this disclosure, and will not be described in detail below.

[0140] For example, as shown in Figures 2 to 6, regarding the four switches K1 to K4, in some embodiments, as shown in Figure 3, when independently boosting the battery, the first charging module 101 can operate independently by controlling the first switch K1 and the fourth switch K4 in the first switch module to be on, while the other switches are not on. That is, the first charging module 101 is configured to independently boost charge the battery E. Alternatively, as shown in Figure 4, by controlling the second switch K2 and the third switch K3 in the first switch module to be on, while the other switches are not on, the second charging module 102 can operate independently, that is, the second charging module 102 is configured to independently boost charge the battery E. The above-mentioned independent boost charging process may include two time periods during its execution: in the first time period, the inductor is charged, and in the second time period, the inductor charges the battery.

[0141] Alternatively, as shown in Figures 5 and 6, in some embodiments, when the battery is charged twice with boost voltage, the first switch K1 and the second switch K2 are turned on, while the other switches are turned off. The first charging module 101 and the second charging module 102 work simultaneously, that is, they are configured to charge the battery after boosting the charging voltage provided by the charging pile twice.

[0142] For the first switch K1 and the second switch K2 mentioned above, only one of them can be set, and the other can be left unset. That is, if only the first switch K1 is set, and the second switch K2 is not set, the second charging module 102 will always participate in the charging process; or, if only the second switch K2 is set, and the second switch K1 is not set, the first charging module 101 will always participate in the charging process.

[0143] The process of performing two boost charging cycles using the above charging circuit can also include two time periods, as shown in Figure 5. In the first time period of the two boost charging cycles, it is also necessary to control the transistor of the lower bridge arm of the first charging module 101 to conduct, so that the current provided by the charging pile charges the inductor of the first charging module 101. Additionally, it is necessary to control the transistor of the upper bridge arm of the first charging module 101 and the transistor of the lower bridge arm of the second charging module 102 to conduct, so that the current provided by the charging pile charges the inductor of the first charging module 101 and the inductor of the second charging module 102.

[0144] As shown in Figure 6, during the second time period of the two boost charging cycles, the transistors controlling the upper arm of the first charging module 101 and the upper arm of the second charging module 102 are turned on, and the inductor freewheeling current and the charging pile together boost charge the battery.

[0145] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0146] In some embodiments, as shown in FIG2, in order to protect the battery E, at least one of a fifth switch K5 and a sixth switch K6 may be included in the first switch module. The first end of the fifth switch K5 is electrically connected to the second connection end of the second charging module 102, and the second end of the fifth switch K5 is electrically connected to the first electrode of the battery E.

[0147] The first end of the sixth switch K6 is electrically connected to the second electrode of the battery E, and the second end of the sixth switch K6 is electrically connected to the third connection end of the second charging module 102.

[0148] By controlling the on / off states of the fifth switch K5 and the sixth switch K6, the charging state of battery E can be controlled. When both switches K5 and K6 are on, battery E is electrically connected to the charging circuit. Combined with the on / off states of the four switches K1 to K4 mentioned above, battery E can be charged in different operating states of the charging circuit.

[0149] In some embodiments, as shown in FIG2, the charging circuit may further include a first capacitor C1. The first capacitor C1 is electrically connected to the first terminal of the first switch K1 and the third connection terminal of the first charging module 101.

[0150] The first capacitor C1 is a boost capacitor, which can play a voltage adaptation role. By applying a preset voltage value to the first capacitor C1 before the charging pile starts working, the charging pile can also provide the corresponding voltage value when it is working.

[0151] In some embodiments, as shown in FIG7, FIG7 is a topology diagram of another charging circuit provided in an embodiment of the present disclosure.

[0152] In this embodiment, the first switch module further includes an eighth switch K8.

[0153] The first end of the eighth switch K8 is electrically connected to the second connection end of the second charging module 102, and the second end of the eighth switch K8 is electrically connected to the first electrode of the battery E.

[0154] In some cases, a seventh switch K7 may also be included, the first end of which is electrically connected to the second connection terminal of the first charging module 101, and the second end of which is electrically connected to the first electrode of the battery E.

[0155] Similar to the embodiment shown in Figure 3, when the third switch K3 is turned on, it can be considered as short-circuiting the first charging module 101, meaning that the first charging module 101 no longer engages in buck-boost operation. Similarly, when the fourth switch K4 is turned on, it can be considered as short-circuiting the second charging module 102, meaning that the second charging module 102 no longer engages in buck-boost operation.

[0156] By controlling the on / off states of six switches—the first switch K1 to the fourth switch K4, the seventh switch K7, and the eighth switch K8—the battery E can be charged in different operating states of the charging circuit.

[0157] For example, referring to Figure 7, for the six switches included in the first switch module, namely the first switch K1 to the fourth switch K4, the seventh switch K7, and the eighth switch K8, in some embodiments, the conduction control can be used to achieve independent boost charging of the battery. Specifically, referring to Figures 9 and 10, by controlling the first switch K1 and the seventh switch K7 to be on while the other switches are not on (or by controlling the first switch K1, the fourth switch K4, and the eighth switch K8 to be on while the other switches are not on), the first charging module 101 can be configured to independently boost charge the battery E. The charging process can also be divided into two time periods. In the first time period shown in Figure 9, the lower bridge arm of the first charging module 101 is turned on, and the inductor in the first charging module 101 is charged. In the second time period shown in Figure 10, the lower bridge arm of the first charging module 101 is turned on, and the inductor in the first charging module 101 charges the battery. Although the current does not flow through the seventh switch K7 in the second time period, it can be turned on simultaneously with the first switch K1 for the convenience of circuit control.

[0158] Alternatively, referring to Figures 11 and 12, by controlling the second switch K2, the third switch K3, and the eighth switch K8 to be turned on, while the other switches are turned off, the second charging module 102 can operate independently, that is, the second charging module 102 is configured to independently boost charge the battery E. This charging process can also be divided into two time periods: in the first time period shown in Figure 12, the lower bridge arm of the second charging module 102 is turned on, charging the inductor in the second charging module 102; in the second time period shown in Figure 12, the upper bridge arm of the second charging module 102 is turned on, charging the battery through the inductor in the second charging module 102. Although the current does not flow through the eighth switch K8 in the second time period, for circuit control convenience, it can be turned on simultaneously with the second switch K2 and the third switch K3.

[0159] Alternatively, in some embodiments, the battery can be charged by performing two boost charging cycles. Referring to Figures 13 and 14, the first switch K1 and the second switch K2 can be turned on, and the eighth switch K8 can also be turned on during the second time period of the two boost cycles, while the other switches are not turned on. The first charging module 101 and the second charging module 102 work simultaneously, so that the charging voltage provided to the charging pile needs to be boosted twice to charge the battery. The specific process can be referred to the description in the following embodiments.

[0160] In some embodiments, as shown in FIG7 above, the charging circuit further includes a ninth switch K9 and the first capacitor C1 described above.

[0161] The first terminal of the ninth switch K9 is electrically connected to the second electrode of the battery E, and the second terminal of the ninth switch K9 is electrically connected to the third connection terminal of the second charging module 102. By controlling the on / off state of the ninth switch K9, the charging state of the battery E can be controlled, which can protect the battery. When charging the battery E is required, the ninth switch also needs to be turned on. The ninth switch K9 is optional. When the first switch K9 is not set, the second electrode of the battery E is electrically connected to the third connection terminal of the second charging module 102.

[0162] The first capacitor C1 is electrically connected to the first terminal of the first switch K1 and the third terminal of the first charging module 101.

[0163] The first capacitor C1 is a boost capacitor, which has the same technical effect as described above.

[0164] In some embodiments, as shown in FIG8, FIG8 is a topology diagram of another charging circuit provided in an embodiment of the present disclosure.

[0165] As shown in Figure 8, the first switch module also includes the tenth switch K10 and the eleventh switch K11.

[0166] The first end of the tenth switch K10 is electrically connected to the first connection end of the first charging module 101, and the second end of the tenth switch K10 is electrically connected to the second connection end of the second charging module 102.

[0167] The first terminal of the eleventh switch K11 is electrically connected to the first connection terminal of the second charging module 102, and the second terminal of the eleventh switch K11 is electrically connected to the first electrode of the battery.

[0168] By properly configuring the on / off states of the first switch K1 to the fourth switch K4 and the seventh switch K7 to the eleventh switch K11 in the first switch module, any working state of independent boost charging, independent buck charging, two boost charging and two buck charging can be achieved and switched.

[0169] For example, as shown in Figures 9 and 10, controlling the first switch K1 and the seventh switch K7 can enable the first charging module 101 to work independently, that is, to configure the first charging module 101 to independently boost charge the battery E. When setting the ninth switch K9, the ninth switch K9 can also be controlled to be turned on.

[0170] As shown in Figure 9, during the first time period of independent boost charging using the first charging module 101, the lower bridge arm of the first charging module 101 is controlled to be turned on, and the current provided by the charging pile is used for inductor charging of the first charging module 101.

[0171] Then, as shown in Figure 10, during the second time period when the first charging module 101 is used for independent boost charging, the upper bridge arm of the first charging module 101 is turned on, and the inductor freewheeling current and the charging pile together boost charge the battery.

[0172] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0173] Alternatively, as shown in Figures 11 and 12, in some embodiments, controlling the second switch K2, the third switch K3, the eighth switch K8, and the ninth switch K9 to be turned on can enable the second charging module 102 to work independently, that is, the second charging module 102 is configured to independently boost charge the battery E.

[0174] As shown in Figure 11, during the first time period of independent boost charging using the second charging module 102, the lower bridge arm of the second charging module 102 is turned on, and the current provided by the charging pile is used for inductive charging of the second charging module 102.

[0175] Then, as shown in Figure 12, during the second time period when the second charging module 102 is used for independent boost charging, the upper bridge arm of the second charging module 102 is controlled to be turned on, and the inductor freewheeling current and the charging pile together boost charge the battery.

[0176] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0177] Alternatively, as shown in Figures 13 and 14, in some embodiments, to achieve secondary boost charging of the battery, the first switch K1 and the second switch K2 can be turned on, and the first charging module 101 and the second charging module 102 can work simultaneously. That is, the charging voltage provided by the charging pile needs to be boosted twice to charge the battery.

[0178] As shown in Figure 13, during the first time period of the two boost charging cycles, the lower bridge arm of the first charging module 101 can be controlled to conduct, and the current provided by the charging pile is used to charge the inductor of the first charging module 101. Furthermore, the upper bridge arm of the first charging module 101 and the lower bridge arm of the second charging module 102 can be controlled to conduct, and the current provided by the charging pile is used to charge the inductor of the second charging module 102.

[0179] As shown in Figure 14, during the second time period of the two boost charging cycles, the eighth switch K8 is also controlled to turn on the transistors of the upper bridge arm of the first charging module 101 and the upper bridge arm of the second charging module 102. The inductor freewheeling current and the charging pile work together to boost charge the battery. Furthermore, if a ninth switch K9 is present, it is also necessary to control the ninth switch K9 to turn on. Although the current does not flow through the eighth switch K8 and the ninth switch K9 during the first time period, for the sake of circuit control convenience, they can be turned on simultaneously with the first switch K1 and the second switch K2.

[0180] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0181] In some embodiments, as shown in Figures 15 and 16, in order to achieve independent step-down charging of the battery, the third switch K3, the eighth switch K8, the ninth switch K9 and the tenth switch K10 are turned on, so that the first charging module 101 can work independently, that is, the first charging module 101 is configured to perform independent step-down charging of the battery E.

[0182] As shown in Figure 15, during the first time period of independent step-down charging using the first charging module 101, the upper bridge arm of the first charging module 101 can be controlled to conduct, so that the inductor energy storage voltage division of the first charging module 101 achieves the purpose of step-down charging.

[0183] Then, as shown in Figure 16, during the second time period when the first charging module 101 independently steps down the voltage for charging, the lower bridge arm of the first charging module 101 is turned on, and the inductor freewheeling continues to charge the battery by stepping down the voltage.

[0184] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different voltage reduction requirements can be achieved.

[0185] Alternatively, as shown in Figures 17 and 18, by controlling the third switch K3, the fourth switch K4, and the eleventh switch K11 to be turned on, the second charging module 102 can be made to work independently, that is, the second charging module 102 is configured to independently step down charge the battery E.

[0186] As shown in Figure 17, during the first time period of independent step-down charging using the second charging module 102, the upper bridge arm of the second charging module 102 is controlled to be turned on, so that the inductor energy storage voltage division of the second charging module 102 achieves the purpose of step-down charging.

[0187] Then, as shown in Figure 18, during the second time period of independent step-down charging using the second charging module 102, the lower bridge arm of the second charging module 102 is turned on, and the inductor freewheeling continues to charge the battery by step-down charging.

[0188] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different voltage reduction requirements can be achieved.

[0189] Alternatively, as shown in Figures 19 and 20, in some embodiments, in order to achieve two voltage reduction charging of the battery, the tenth switch K10 and the eleventh switch K11 are turned on, and the first charging module 101 and the second charging module 102 work simultaneously. That is, the charging voltage provided by the charging pile needs to be reduced twice before charging the battery.

[0190] As shown in Figure 19, during the first time period of the two step-down charging cycles, the upper bridge arm of the first charging module 101 and the upper bridge arm of the second charging module 102 are turned on, so that the inductance of the first charging module 101 and the inductance of the second charging module 102 can store energy and divide the voltage to achieve the purpose of step-down charging.

[0191] Then, as shown in Figure 20, during the second time period of the two step-down charging cycles, the third switch K3 and the lower bridge arm of the second charging module 102 are also controlled to conduct, and the inductor freewheeling current of the second charging module 102 continues to charge the battery at a step-down voltage. Simultaneously, the lower bridge arm of the first charging module 101 and the upper bridge arm of the second charging module 102 are controlled to conduct, and the inductors of the first charging module 101 and the second charging module 102 continue to charge the battery at a step-down voltage.

[0192] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0193] In some embodiments, in order to enable the battery to be heated when needed, as shown in FIG8, the battery may be configured to include a first battery pack E1 and a second battery pack E2, wherein the first electrode of the battery serves as the first electrode of the first battery pack E1, the second electrode of the first battery pack E1 is electrically connected to the first electrode of the second battery pack E2, and the second electrode of the battery serves as the second electrode of the second battery pack E2.

[0194] The first switching circuit at this time may also include a twelfth switch K12. The first end of the twelfth switch K12 is electrically connected to the second electrode of the first battery pack E1 and the first electrode of the second battery pack E2. The second end of the twelfth switch K12 is electrically connected to the first connection end of the first charging module 101 or the second charging module 102.

[0195] Figure 8 illustrates the case where the second terminal of the twelfth switch K12 is electrically connected to the first connection terminal of the second charging module 102. The case where the second terminal of the twelfth switch K12 is electrically connected to the first connection terminal of the first charging module 101 is similar and will not be illustrated here.

[0196] In this embodiment of the disclosure, the battery includes a first battery pack E1 and a second battery pack E2. This is beneficial for increasing battery capacity and for using any one of the charging modules to charge and discharge the battery, thereby achieving a self-heating function during the charging and discharging process.

[0197] For example, in some embodiments, when heating the battery, as shown in Figures 21 to 24, Figure 21 is a schematic diagram of the self-heating operation of the charging circuit shown in Figure 8, Figure 22 is a schematic diagram of the self-heating operation of the charging circuit shown in Figure 9, Figure 23 is a schematic diagram of the self-heating operation of the charging circuit shown in Figure 8, and Figure 24 is a schematic diagram of the self-heating operation of the charging circuit shown in Figure 8.

[0198] As shown in Figure 21, during the first time period, the seventh switch K7, the fourth switch K4 and the twelfth switch K12 can be turned on, and the upper bridge arm of the second charging module 102 can be turned on. The first battery pack E1 charges the corresponding inductor in the second charging module 102. The current flows from the first electrode of the first battery pack E1 through the corresponding inductor and back to the second electrode.

[0199] As shown in Figure 22, during the second time period, the ninth switch K9 and the twelfth switch K12 are turned on, and the lower bridge arm of the second charging module 102 is turned on. The energy stored in the inductor during the first preset time period charges the second battery pack E2 under the freewheeling effect.

[0200] And / or, as shown in Figure 23, during the third time period, the ninth switch K9 and the twelfth switch K12 are turned on, and the lower bridge arm of the second charging module 102 is turned on. The second battery pack E2 charges the corresponding inductor in the second charging module 102. The current flows from the first electrode of the second battery pack E2 through the corresponding inductor and then back to the second electrode.

[0201] As shown in Figure 24, during the fourth time period, the seventh switch K7, the fourth switch K4 and the twelfth switch K12 are turned on, and the upper bridge arm of the second charging module 102 is turned on. The energy stored in the inductor during the third preset time period charges the first battery pack E1 under the freewheeling effect.

[0202] By repeatedly switching between the first and second preset time periods, the first battery pack E1 can be discharged and the second battery pack E2 can be charged. By switching between the third and fourth preset time periods, the second battery pack E2 can be discharged and the first battery pack E1 can be charged. By reasonably controlling the corresponding durations of the above different preset time periods, repeated charging and discharging of the first battery pack E1 and the second battery pack E2 can be achieved. During this process, the self-heating function of the battery can be realized by utilizing the thermal effect of the battery's internal resistance.

[0203] In some embodiments, as shown in FIG8, the charging circuit may further include a second capacitor C3, the first end of the second capacitor C3 being electrically connected to the first end of the second switch K2, and the second end of the second capacitor C3 being electrically connected to the third connection end of the second charging module 102.

[0204] The second capacitor C3 is also a boost capacitor, which can play a voltage adaptation role. By applying a preset voltage value to the first capacitor C1 before the charging pile starts working, the charging pile can also provide the corresponding voltage value when it is working.

[0205] In some embodiments, as shown in FIG25, FIG25 is a topology diagram of another charging circuit provided in an embodiment of the present disclosure.

[0206] As shown in Figure 25, the at least two charging modules at this time include a first charging module 101 and a second charging module 102. In this embodiment, the first charging module 101 and the second charging module 102 can be configured to perform two step-down charging operations. Specifically, the first switching circuit may include a thirteenth switch K13, a fifteenth switch K15, a sixteenth switch K16, and an eighteenth switch K18.

[0207] Specifically, the first end of the thirteenth switch K13 is adapted to be electrically connected to the first end of the external charging pile, which can be used as the charging input end of the charging circuit, and the second end of the thirteenth switch K13 is electrically connected to the second connection end of the first charging module 101.

[0208] The first end of the fifteenth switch K15 is electrically connected to the first connection end of the first charging module 101, the second end of the fifteenth switch K15 is electrically connected to the second connection end of the second charging module 102, the first end of the sixteenth switch K16 is electrically connected to the first connection end of the second charging module 102, and the second end of the sixteenth switch K16 is electrically connected to the first electrode of the battery E.

[0209] The first terminal of the eighteenth switch K18 is electrically connected to the second electrode of battery E, and the second terminal of the eighteenth switch K18 is electrically connected to the third connection terminal of the second charging module 102. By controlling the on / off state of the eighteenth switch K18, the charging state of battery E can be controlled. The second terminal of the eighteenth switch, the third connection terminal of the first charging module 101, and the third connection terminal of the second charging module 102 are electrically connected to each other and are all suitable for electrical connection to the second terminal of the external charging pile. The eighteenth switch K18 is optional; when the eighteenth switch K18 is not provided, the second electrode of battery E is suitable for electrical connection to the second terminal of the external charging pile.

[0210] Based on the above connection relationship, by reasonably configuring the on / off status of the four switches, namely the thirteenth switch K13, the fifteenth switch, the sixteenth switch K16, and the eighteenth switch K18, the charging circuit can be controlled to switch between different buck charging operating states.

[0211] In some embodiments, as shown in FIG25, the charging circuit further includes at least one of a fourteenth switch K14 and a seventeenth switch K17.

[0212] The first terminal of the fourteenth switch K14 is electrically connected to the second terminal of the first charging module 101, and the second terminal of the fourteenth switch K14 is electrically connected to the second connection terminal of the second charging module 102.

[0213] The first terminal of the seventeenth switch K17 is electrically connected to the first terminal of the fourteenth switch K14, and the second terminal of the seventeenth switch K17 is electrically connected to the first electrode of the battery E.

[0214] For example, as shown in Figure 25, in some embodiments, the charging module can independently step down the voltage to charge the battery for the five switches from the thirteenth switch K13 to the seventeenth switch K17. For example, referring to Figures 17 and 18 above, by controlling the thirteenth switch K13, the fourteenth switch K14 and the sixteenth switch K16 to be turned on, the second charging module 102 can work independently, that is, the second charging module 102 is configured to independently step down the voltage to charge the battery E.

[0215] Alternatively, as shown in Figures 26 and 27, in some embodiments, the charging circuit can perform two voltage-reduction charging of the battery. For example, it can control the fifteenth switch K15 and the sixteenth switch K16 in the first switch module to be turned on, and the first charging module 101 and the second charging module 102 work simultaneously. That is, the charging voltage provided by the charging pile can be reduced twice to charge the battery. When the eighteenth switch K18 is turned on, the eighteenth switch K18 is also controlled to be turned on.

[0216] As shown in Figure 26, during the first time period of the two step-down charging cycles, the thirteenth switch K13, the upper bridge arm of the first charging module 101, and the upper bridge arm of the second charging module 102 are also controlled to conduct, so that the inductance of the first charging module 101 and the inductance of the second charging module 102 can achieve the purpose of step-down charging by dividing the energy storage voltage.

[0217] Then, as shown in Figure 27, during the second time period of the two step-down charging cycles, the lower bridge arm of the first charging module 101 and the upper bridge arm of the second charging module 102 are turned on, and the inductors of the first charging module 101 and the second charging module 102 continue to provide step-down charging to the battery. Simultaneously, the lower bridge arm of the second charging module 102 is turned on, and the inductor of the second charging module 102 continues to provide step-down charging to the battery.

[0218] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0219] For the aforementioned fifteenth switch K15 and sixteenth switch K16, only one can be set, while the other is not set. That is, if only the fifteenth switch K15 is set and the sixteenth switch K16 is not set, the second charging module 102 will always participate in the charging process; or, if only the sixteenth switch K16 is set and the fifteenth switch K15 is not set, the first charging module 101 will always participate in the charging process.

[0220] The above-described implementations only illustrate some typical functions under a few topologies; many other achievable functions are not detailed here. Furthermore, by incorporating the concept of step-up / step-down voltage conversion, the number of voltage transformations can be further increased, such as in a three-stage voltage transformation charging scheme.

[0221] For example, as shown in FIG28, FIG28 is a topology diagram of another charging circuit provided in an embodiment of the present disclosure. The above-mentioned at least two charging modules include a third charging module 103, a fourth charging module 104 and a fifth charging module 105. The third charging module 103, the fourth charging module 104 and the fifth charging module 105 are configured to perform three voltage transformation charging on the battery in sequence, so as to adapt to the scenario of large voltage transformation, realize charging with large voltage change, or limit each voltage change to a small value.

[0222] Furthermore, the charging circuit described above also includes a second switch module, which is used to control the third charging module 103, the fourth charging module 104 and the fifth charging module 105 to perform three voltage transformation charges on the battery in sequence.

[0223] In addition, for the three charging modules mentioned above, in some cases, they can individually perform voltage conversion charging of the battery, and / or perform voltage conversion charging of the battery twice. Specifically, as described in the above embodiments, in this embodiment of the disclosure, the above effects can be achieved by setting the switches included in the second switch module and their connection relationships, and by controlling the conduction or disconnection of each switch.

[0224] In addition, the transformer charging in the embodiments of this disclosure may also include boost charging and / or buck charging.

[0225] In some embodiments, as shown in FIG28, the second switch module includes a nineteenth switch K19, a twentieth switch K20, a twenty-first switch K21, a twenty-second switch K22, a twenty-third switch K23, and a twenty-fourth switch K24.

[0226] The first end of the nineteenth switch K19 is adapted to be electrically connected to the first end of the first external charging pile, and it can be used as a charging input end. The second end of the nineteenth switch K19 is electrically connected to the second connection end of the third charging module 103.

[0227] The first terminal of the twentieth switch K20 is electrically connected to the first connection terminal of the third charging module 103, and the second terminal of the twentieth switch K20 is electrically connected to the second connection terminal of the fourth charging module 104; the first terminal of the twenty-first switch K21 is electrically connected to the first connection terminal of the fourth charging module 104, and the second terminal of the twenty-first switch K21 is electrically connected to the second connection terminal of the fifth charging module 105; the first terminal of the twenty-second switch K22 is electrically connected to the first connection terminal of the fifth charging module 105, and the second terminal of the twenty-second switch K22 is electrically connected to the first electrode of the battery.

[0228] Furthermore, the first end of the aforementioned twenty-third switch K23 is suitable for electrical connection with the first end of the second external charging pile, and it can also be used as a charging input end. The second end of the twenty-third switch K23 is electrically connected to the first connection end of the fifth charging module 105. The first end of the twenty-fourth switch K24 is electrically connected to the second connection end of the third charging module 103. The second end of the twenty-fourth switch K24 is electrically connected to the first electrode of the battery.

[0229] In addition, the second electrode of the battery E, the third connection terminal of the third charging module 103, the third connection terminal of the fourth charging module 104 and the third connection terminal of the fifth charging module 105 can be electrically connected to each other, and are all suitable for electrical connection with the second end of the first external charging pile and the second end of the second external charging pile.

[0230] In the above embodiments, the external charging pile may include a first external charging pile A and a second external charging pile B. The charging circuit can step down the power input from the first terminal of the nineteenth switch K19 and step up the power input from the first terminal of the twenty-third switch 23. That is, the charging circuit distinguishes between the step-up charging input terminal and the step-down charging input terminal, which are the first terminal of the twenty-third switch 23 and the first terminal of the nineteenth switch K19, respectively.

[0231] Specifically, as shown in Figure 29, when performing three buck charging operations on the battery, the nineteenth switch K19, the twentieth switch K20, the twenty-first switch K21, and the twenty-second switch K22 in the second switch module can be turned on, and the third charging module 103, the fourth charging module 104, and the fifth charging module 105 can sequentially perform buck charging, thereby achieving three buck charging operations; or, as shown in Figure 31, when performing three boost charging operations on the battery, the twentieth switch K20, the twenty-first switch K21, the twenty-third switch K23, and the twenty-fourth switch K24 can be turned on, and the fifth charging module 105, the fourth charging module 104, and the third charging module 103 can sequentially perform boost charging, thereby achieving three boost charging operations. In this embodiment of the disclosure, the specific circuit structure of the three charging modules can be as described in the above embodiments, including inductors, upper bridge arms, and lower bridge arms. Therefore, the specific charging or discharging process can include two time periods. In the first time period, the inductor is charged by controlling the switch and the upper and lower bridge arms. In the second time period, the inductor is discharged by controlling the switch and the upper and lower bridge arms, thereby charging the battery. For specific implementation methods, please refer to the description in the above embodiments. This embodiment of the disclosure will not repeat the details.

[0232] In the embodiments disclosed above, in addition to the case of using three charging modules to perform three buck charging or boost charging operations, the design and control of the switches included in the second switching module can be used to short-circuit one or two charging modules, while using the other two or one charging modules to perform buck charging or boost charging.

[0233] As shown in Figure 28, the second switch module further includes a twenty-fifth switch K25, a twenty-sixth switch K26, and a twenty-seventh switch K27.

[0234] Specifically, the first end of the 25th switch K25 is adapted to be electrically connected to the first end of the second external charging pile, and the second end of the 25th switch K25 is electrically connected to the second connection end of the fifth charging module 105; the first end of the 26th switch K26 is electrically connected to the second connection end of the fourth charging module 104; the first end of the 27th switch K27 is electrically connected to the second connection end of the fourth charging module 104, and the second end of the 27th switch K27 is electrically connected to the second connection end of the third charging module 103.

[0235] For the circuit topology shown in Figure 28, for example, during the boost charging process, as shown in Figure 30, if the 25th switch K25 is turned on, the 5th charging module 105 can be turned off, allowing for two boosts using the 4th charging module 104 and the 3rd charging module 103. Alternatively, if the 25th switch K25 is turned off and the 26th switch K26 and the 27th switch K27 are turned on, only one boost can be achieved using the 5th charging module 105. The same applies to the buck charging process. In this embodiment, in addition to the three switches shown in Figure 29, other methods can be used for the circuit structure design and control of the second switch module, thereby enabling any one or any two of the three charging modules to perform transformer charging.

[0236] In the embodiment shown in Figure 28 above, the battery can also be heated by the charging module. For example, the battery includes a third battery pack E3 and a fourth battery pack E4. The first electrode of the battery is the first electrode of the third battery pack E3, and the second electrode of the third battery pack E3 is electrically connected to the first electrode of the fourth battery pack E4. The second electrode of the battery is the second electrode of the fourth battery pack E4.

[0237] Furthermore, the aforementioned second switch module also includes a twenty-ninth switch K29. The first terminal of the twenty-ninth switch K29 is electrically connected to the second electrode of the third battery pack E3 and the first electrode of the fourth battery pack E4. The second terminal of the twenty-ninth switch K29 is electrically connected to the first connection terminal of the third charging module 103 or the first connection terminal of the fourth charging module 104. In the embodiment shown in Figure 29, it is electrically connected to the first connection terminal of the fourth charging module 104. The fourth charging module 104 can discharge the third battery pack E3 and charge the fourth battery pack E4, and / or discharge the fourth battery pack E4 and charge the third battery pack E3, thereby achieving battery heating. For the specific charging and discharging control process, please refer to the description in the above embodiments.

[0238] Alternatively, as shown in Figures 29 and 30, in some embodiments, in order to achieve three-stage step-down charging of the battery, the twentieth switch K20, the twenty-first switch K21, and the twenty-second switch K22 are turned on, and the third charging module 103, the fourth charging module 104, and the fifth charging module 105 work simultaneously. That is, the charging voltage provided by the charging pile needs to be stepped down three times before charging the battery.

[0239] As shown in Figure 29, during the first time period of the three-stage step-down charging, the nineteenth switch K19, the upper bridge arm of the third charging module 103, the upper bridge arm of the fourth charging module 104, and the upper bridge arm of the fifth charging module 105 are also controlled to be turned on, so that the inductors of the third charging module 103, the fourth charging module 104, and the fifth charging module 105 can achieve the purpose of step-down charging by storing energy and dividing voltage.

[0240] Then, as shown in Figure 30, during the second time period of the three-stage step-down charging, the lower bridge arm of the third charging module 103, the upper bridge arm of the fourth charging module 104, and the upper bridge arm of the fifth charging module 105 are controlled to conduct, so that the inductors of the third charging module 103, the fourth charging module 104, and the fifth charging module 105 continue to provide step-down charging to the battery. Alternatively, the lower bridge arm of the fourth charging module 104 can be controlled to conduct simultaneously, so that the inductors of the fourth charging module 104 and the fifth charging module 105 continue to provide step-down charging to the battery. Similarly, the lower bridge arm of the fifth charging module 105 can be controlled to conduct simultaneously, so that the inductor of the fifth charging module 105 continues to provide step-down charging to the battery.

[0241] Although the current does not flow through the nineteenth switch K19 during the second time period mentioned above, for the convenience of circuit control, it can be turned on simultaneously with the twentieth switch K20, the twenty-first switch K21, and the twenty-second switch K22.

[0242] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0243] Alternatively, as shown in Figures 31 and 32, in some embodiments, to achieve three boost charging of the battery, the twentieth switch K20, the twenty-first switch K21, the twenty-third switch K23, and the twenty-fourth switch K24 can be turned on, and the first charging module 101 and the second charging module 102 work simultaneously. That is, the charging voltage provided by the charging pile needs to be boosted three times to charge the battery.

[0244] As shown in Figure 31, during the first time period of the three-stage boost charging, the lower bridge arm of the fifth charging module 105 can be controlled to conduct, so that the current provided by the charging pile charges the inductor of the fifth charging module 105. Furthermore, the upper bridge arm of the fifth charging module 105 and the lower bridge arm of the fourth charging module 104 can be controlled to conduct simultaneously, so that the current provided by the charging pile charges the inductors of the fifth charging module 105 and the fourth charging module 104. Also, the upper bridge arm of the fourth charging module 104 and the lower bridge arm of the third charging module 103 can be controlled to conduct simultaneously, so that the current provided by the charging pile charges the inductors of the fifth charging module 105, the fourth charging module 104, and the third charging module 103.

[0245] Then, as shown in Figure 32, during the second time period of the three boost charging cycles, the twenty-fourth switch K24, as well as the upper bridge arm of the fifth charging module 105, the upper bridge arm of the fourth charging module 104, and the upper bridge arm of the third charging module 103 are also controlled to conduct, and the inductor freewheeling current and the charging pile together boost charge the battery.

[0246] Although the current does not flow through the 24th switch K24 during the first time period, it can be turned on simultaneously with the 20th switch K20, the 21st switch K21, and the 23rd switch K23 for the convenience of circuit control.

[0247] By controlling the proportion of inductor charging time within a control cycle through program control, charging functions with different boost requirements can be achieved.

[0248] In the above embodiments of this disclosure, a corresponding switch, such as switch K0, switch K01, K02, etc., can be set in the circuit connected to the second end of the external charging pile. It can be turned on or off simultaneously with the switch connected to the second end of the external charging pile to realize charging from the external charging pile.

[0249] In addition to setting two or three charging modules to achieve variable voltage charging in the above embodiments, more charging modules and corresponding switching modules can be set in the embodiments of this disclosure to achieve more voltage boosting and bucking cycles, which can achieve similar technical effects as the above embodiments of this invention, and will not be listed here.

[0250] Furthermore, in the embodiments provided in this disclosure, the buck-boost charging topology is based on the motor assembly. It is understood that any device that meets this function can be used to replace it. For example, buck-boost modules composed of various combinations such as compressors, external inductors and switches can replace the motor assembly to achieve the buck-boost function. They will not be listed one by one here.

[0251] Secondly, this disclosure also provides a vehicle, as shown in FIG33, FIG33 being a structural schematic diagram of a vehicle provided in an embodiment of this disclosure, the vehicle 20 including the charging circuit 10 in any of the embodiments of the first aspect described above.

[0252] Since the charging circuit 10 includes at least two charging modules, each module can individually charge the battery, or the two modules can work together to perform at least two voltage conversions. Based on this, with a fixed voltage difference between the step-up and step-down voltages of each charging module, the two voltage conversions result in a larger voltage difference, allowing the circuit to adapt to a wider range of charging voltages. This means the vehicle 20, including the charging circuit 10, can be compatible with more types of charging stations, improving compatibility with different charging stations and ensuring charging operation between the vehicle 20 and various types of charging stations.

[0253] Alternatively, if the voltage difference between the battery voltage required by vehicle 20 and the charging voltage provided by the charging pile is constant, the battery can be charged by two voltage transformations through the charging circuit 10. This can reduce the voltage difference between the step-up and step-down voltages of each charging module, thereby reducing losses, alleviating heat generation problems, and thus improving the safety and reliability of vehicle 20.

[0254] In the description of this specification, the terms "certain embodiments," "in some embodiments," "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with embodiments or examples that are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0255] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0256] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A charging circuit 10, wherein, The charging circuit 10 is adapted to be electrically connected to an external charging pile. The charging circuit 10 includes at least two charging modules, which are configured to perform at least two voltage-controlled charging operations on the battery E.

2. The charging circuit 10 according to claim 1, wherein, The at least two charging modules are configured to perform at least two voltage conversion charges on battery E, including: The at least two charging modules are configured to perform at least two sequential voltage-changing charges on the battery E.

3. The charging circuit 10 according to claim 1 or 2, wherein, The transformer charging includes boost charging and / or buck charging.

4. The charging circuit 10 according to any one of claims 1-3, wherein, The at least two charging modules have the same circuit structure.

5. The charging circuit 10 according to any one of claims 1-4, wherein, The at least two charging modules include a first charging module 101 and a second charging module 102, wherein the first charging module 101 and the second charging module 102 are configured to perform two sequential voltage conversion charging on the battery E.

6. The charging circuit 10 according to claim 5, wherein, The charging circuit 10 further includes a first switch module, which is used to control the first charging module 101 and the second charging module 102 to perform two sequential voltage transformation charges on the battery E.

7. The charging circuit 10 according to claim 6, wherein, The first switch module includes a first switch K1 and a second switch K2; The first end of the first switch K1 is adapted to be electrically connected to the first end of the external charging pile, and the second end of the first switch K1 is electrically connected to the first connection end D1 of the first charging module 101. The first end of the second switch K2 is electrically connected to the second connection end D2 of the first charging module 101, and the second end of the second switch K2 is electrically connected to the first connection end D1 of the second charging module 102. The second connection terminal D2 of the second charging module 102 is electrically connected to the first electrode of the battery E; The second electrode of the battery E, the third connection terminal D3 of the first charging module 101 and the third connection terminal D3 of the second charging module 102 are electrically connected to each other, and are all suitable for electrical connection to the second end of the external charging pile.

8. The charging circuit 10 according to claim 7, wherein, When the battery E is charged twice with boost voltage, the first switch K1 and the second switch K2 are turned on.

9. The charging circuit 10 according to claim 8, wherein, Both the first charging module 101 and the second charging module 102 include an inductor, an upper bridge arm, and a lower bridge arm. The first end of the inductor serves as the first connection terminal D1, and the second end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm. The second end of the upper bridge arm serves as the second connection terminal D2, and the second end of the lower bridge arm serves as the third connection terminal D3. During the first time period of performing two boost charging cycles on the battery E, the upper and lower bridge arms of the first charging module 101 and the lower bridge arm of the second charging module 102 are also controlled to be turned on. During the second time period of performing two boost charging cycles on the battery E, the upper bridge arm of the first charging module 101 and the upper bridge arm of the second charging module 102 are also controlled to be turned on.

10. The charging circuit 10 according to claim 7, wherein, The first switch module also includes a third switch K3 and a fourth switch K4; The first end of the third switch K3 is adapted to be electrically connected to the first end of the external charging pile, the second end of the third switch K3 is electrically connected to the second connection end D2 of the first charging module 101, the first end of the fourth switch K4 is electrically connected to the second connection end D2 of the first charging module 101, and the second end of the fourth switch K4 is electrically connected to the second connection end D2 of the second charging module 102.

11. The charging circuit 10 according to claim 10, wherein, The first switch module further includes at least one of a fifth switch K5 and a sixth switch K6; The first end of the fifth switch K5 is electrically connected to the second connection end D2 of the second charging module 102, and the second end of the fifth switch K5 is electrically connected to the first electrode of the battery E. The first end of the sixth switch K6 is electrically connected to the second electrode of the battery E, and the second end of the sixth switch K6 is electrically connected to the third connection end D3 of the second charging module 102.

12. The charging circuit 10 according to claim 11, wherein, It also includes the first capacitor C1 and / or the second capacitor C3; The first capacitor C1 is electrically connected to the first terminal of the first switch K1 and the third connection terminal D3 of the first charging module 101, and the second capacitor C3 is electrically connected to the first terminal of the second switch K2 and the third connection terminal D3 of the second charging module 102.

13. The charging circuit 10 according to claim 10, wherein, The first switch module also includes an eighth switch K8; The first end of the eighth switch K8 is electrically connected to the second connection end D2 of the second charging module 102, and the second end of the eighth switch K8 is electrically connected to the first electrode of the battery E.

14. The charging circuit 10 according to claim 13, wherein, The first switch module also includes: The seventh switch K7 has its first end electrically connected to the second connection terminal D2 of the first charging module 101, and its second end electrically connected to the first electrode of the battery E.

15. The charging circuit 10 according to claim 13, wherein, When the battery E is charged with a second boost voltage, the first switch K1 and the second switch K2 are turned on.

16. The charging circuit 10 according to claim 15, wherein, Both the first charging module 101 and the second charging module 102 include an inductor, an upper bridge arm, and a lower bridge arm. The first end of the inductor serves as the first connection terminal D1, and the second end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm. The second end of the upper bridge arm serves as the second connection terminal D2, and the second end of the lower bridge arm serves as the third connection terminal D3. During the first time period of performing two boost charging cycles on the battery E, the upper and lower bridge arms of the first charging module 101 and the lower bridge arm of the second charging module 102 are also controlled to be turned on. During the second time period of performing two boost charging cycles on the battery E, the eighth switch K8, the upper bridge arm of the first charging module 101, and the upper bridge arm of the second charging module 102 are also controlled to be turned on.

17. The charging circuit 10 according to claim 14, wherein, It also includes the ninth switch, K9; The first end of the ninth switch K9 is electrically connected to the second electrode of the battery E, and the second end of the ninth switch K9 is electrically connected to the third connection end D3 of the second charging module 102.

18. The charging circuit 10 according to claim 14, wherein, The first switch module also includes a tenth switch K10 and an eleventh switch K11; The first end of the tenth switch K10 is electrically connected to the first connection end D1 of the first charging module 101, and the second end of the tenth switch K10 is electrically connected to the second connection end D2 of the second charging module 102. The first end of the eleventh switch K11 is electrically connected to the first connection end D1 of the second charging module 102, and the second end of the eleventh switch K11 is electrically connected to the first electrode of the battery E.

19. The charging circuit 10 according to claim 18, wherein, When the battery E is charged twice with reduced voltage, the tenth switch K10 and the eleventh switch K11 are turned on.

20. The charging circuit 10 according to claim 19, wherein, Both the first charging module 101 and the second charging module 102 include an inductor, an upper bridge arm, and a lower bridge arm. The first end of the inductor serves as the first connection terminal D1, and the second end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm. The second end of the upper bridge arm serves as the second connection terminal D2, and the second end of the lower bridge arm serves as the third connection terminal D3. During the first time period when the battery E is charged twice with reduced voltage, the third switch K3 is also controlled to turn on the upper bridge arm of the first charging module 101 and the upper bridge arm of the second charging module 102; and during the second time period when the battery E is charged twice with reduced voltage, the lower bridge arm of the first charging module 101 and the upper and lower bridge arms of the second charging module 102 are also controlled to turn on.

21. The charging circuit 10 according to claim 6, wherein, The first switch module includes a thirteenth switch K13, a fifteenth switch K15, and a sixteenth switch K16; The first end of the thirteenth switch K13 is adapted to be electrically connected to the first end of the external charging pile, and the second end of the thirteenth switch K13 is electrically connected to the second connection end D2 of the first charging module 101. The first end of the fifteenth switch K15 is electrically connected to the first connection end D1 of the first charging module 101, the second end of the fifteenth switch K15 is electrically connected to the second connection end D2 of the second charging module 102, the first end of the sixteenth switch K16 is electrically connected to the first connection end D1 of the second charging module 102, and the second end of the sixteenth switch K16 is electrically connected to the first electrode of the battery E. The second electrode of the battery E, the third connection terminal D3 of the first charging module 101 and the third connection terminal D3 of the second charging module 102 are electrically connected to each other, and are all suitable for electrical connection to the second end of the external charging pile.

22. The charging circuit 10 according to claim 21, wherein, The first switch module further includes at least one of the fourteenth switch K14, the seventeenth switch K17, and the eighteenth switch K18; The first end of the fourteenth switch K14 is electrically connected to the second end of the first charging module 101, and the second end of the fourteenth switch K14 is electrically connected to the second connection end D2 of the second charging module 102. The first terminal of the seventeenth switch K17 is electrically connected to the first terminal of the fourteenth switch K14, and the second terminal of the seventeenth switch K17 is electrically connected to the first electrode of the battery E. The first end of the eighteenth switch K18 is electrically connected to the second electrode of the battery E, and the second end of the eighteenth switch K18 is electrically connected to the third connection end D3 of the second charging module 102.

23. In the charging circuit 10 according to claim 21, when performing a second step-down charging on the battery E, the fifteenth switch K15 and the sixteenth switch K16 are controlled to be turned on.

24. The charging circuit 10 according to claim 23, wherein, Both the first charging module 101 and the second charging module 102 include an inductor, an upper bridge arm, and a lower bridge arm. The first end of the inductor serves as the first connection terminal D1. The first end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm. The second end of the upper bridge arm serves as the second connection terminal D2, and the second end of the lower bridge arm serves as the third connection terminal D3. During the first time period of performing two step-down charging cycles on battery E, the thirteenth switch K13, the upper bridge arm of the first charging module 101, and the upper bridge arm of the second charging module 102 are also controlled to be turned on. During the second time period of performing two step-down charging cycles on battery E, the lower bridge arm of the first charging module 101, and the upper and lower bridge arms of the second charging module 102 are also controlled to be turned on.

25. The charging circuit 10 according to claim 4, wherein, The at least two charging modules include a third charging module 103, a fourth charging module 104, and a fifth charging module 105, wherein the third charging module 103, the fourth charging module 104, and the fifth charging module 105 are configured to perform three sequential voltage-changing charges on the battery E.

26. The charging circuit 10 according to claim 25, wherein, The charging circuit 10 further includes a second switch module, which is used to control the third charging module 103, the fourth charging module 104 and the fifth charging module 105 to perform three voltage transformation charges on the battery E in sequence.

27. The charging circuit 10 according to claim 26, wherein, The second switch module includes the nineteenth switch K19, the twentieth switch K20, the twenty-first switch K21, the twenty-second switch K22, the twenty-third switch K23, and the twenty-fourth switch K24; The first end of the nineteenth switch K19 is adapted to be electrically connected to the first end of the first external charging pile, and the second end of the nineteenth switch K19 is electrically connected to the second connection end D2 of the third charging module 103; the first end of the twentieth switch K20 is electrically connected to the first connection end D1 of the third charging module 103, and the second end of the twentieth switch K20 is electrically connected to the second connection end D2 of the fourth charging module 104; the first end of the twenty-first switch K21 is electrically connected to the first connection end D1 of the fourth charging module 104, and the second end of the twenty-first switch K21 is electrically connected to the second connection end D2 of the fifth charging module 105; the first end of the twenty-second switch K22 is electrically connected to the first connection end D1 of the fifth charging module 105, and the second end of the twenty-second switch K22 is electrically connected to the first electrode of the battery E. The first end of the 23rd switch K23 is adapted to be electrically connected to the first end of the second external charging pile, the second end of the 23rd switch K23 is electrically connected to the first connection end D1 of the fifth charging module 105, the first end of the 24th switch K24 is electrically connected to the second connection end D2 of the third charging module 103, and the second end of the 24th switch K24 is electrically connected to the first electrode of the battery E. The second electrode of the battery E, the third connection terminal D3 of the third charging module 103, the third connection terminal D3 of the fourth charging module 104, and the third connection terminal D3 of the fifth charging module 105 are electrically connected to each other, and are all suitable for electrical connection to the second end of the first external charging pile and the second end of the second external charging pile.

28. The charging circuit 10 according to claim 27, wherein, When the battery E is charged three times with reduced voltage, the twentieth switch K20, the twenty-first switch K21, and the twenty-second switch K22 are turned on.

29. The charging circuit 10 according to claim 28, wherein, The third charging module 103, the fourth charging module 104, and the fifth charging module 105 each include an inductor, an upper bridge arm, and a lower bridge arm. The first end of the inductor serves as the first connection terminal D1. The first end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm. The second end of the upper bridge arm serves as the second connection terminal D2, and the second end of the lower bridge arm serves as the third connection terminal D3. During the first time period of performing three step-down charging cycles on battery E, the nineteenth switch K19, the upper arm of the third charging module 103, the upper arm of the fourth charging module 104, and the upper arm of the fifth charging module 105 are also controlled to be turned on. During the second time period of performing three step-down charging cycles on battery E, the lower arm of the third charging module 103, the upper and lower arms of the fourth charging module 104, and the upper and lower arms of the fifth charging module 105 are also controlled to be turned on.

30. The charging circuit 10 according to claim 27, wherein, When the battery E is charged three times with boost voltage, the twentieth switch K20, the twenty-first switch K21, and the twenty-third switch K23 are turned on.

31. The charging circuit 10 according to claim 30, wherein, The third charging module 103, the fourth charging module 104, and the fifth charging module 105 each include an inductor, an upper bridge arm, and a lower bridge arm. The first end of the inductor serves as the first connection terminal D1. The first end of the inductor is electrically connected to the first end of the upper bridge arm and the first end of the lower bridge arm. The second end of the upper bridge arm serves as the second connection terminal D2, and the second end of the lower bridge arm serves as the third connection terminal D3. During the first time period of performing three boost charging cycles on battery E, the upper and lower bridge arms of the fifth charging module 105, the upper and lower bridge arms of the fourth charging module 104, and the lower bridge arm of the third charging module 103 are also controlled to be turned on. During the second time period of performing three boost charging cycles on battery E, the twentieth fourteenth switch K24 is also controlled to be turned on, as are the upper bridge arms of the fifth charging module 105, the fourth charging module 104, and the third charging module 103.

32. A type of vehicle 20, wherein, Includes the charging circuit 10 as described in any one of claims 1-31.

Images