Charging device, charging method, battery system, energy storage equipment and vehicle

Abstract

The invention relates to the technical field of energy storage, in particular to a charging device, a charging method, a battery system, energy storage equipment and a vehicle. The charging device comprises a first electric energy conversion circuit, a switching circuit, a second electric energy conversion circuit and a control circuit. The first end and the second end of the first electric energy conversion circuit serve as first charging and discharging ports, and the third end and the fourth end serve as second charging and discharging ports; the first end and the second end of the switching circuit are respectively coupled to the fifth end and the sixth end of the first electric energy conversion circuit, and the third end and the fourth end of the switching circuit are respectively coupled to the seventh end and the eighth end of the first electric energy conversion circuit; the first end and the second end of the second electric energy conversion circuit are respectively coupled to the fifth end and the sixth end of the switching circuit, and the third end and the fourth end of the second electric energy conversion circuit serve as charging ports; the control circuit is configured to enable the second electric energy conversion circuit to take electricity from different ports of the first electric energy conversion circuit by controlling different conduction paths of the switching circuit, and the electricity is output through the charging port.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to a charging device, a charging method, a battery system, an energy storage device, and a vehicle. Background Art

[0002] When charging and discharging different types of batteries (such as power batteries and storage batteries), since different types of batteries have different voltage requirements, it is necessary to process the voltage output by the voltage source through a current conversion circuit, a rectifier circuit, a voltage transformation circuit, etc. to adapt to the requirements of different batteries.

[0003] In the prior art, a charging mode of simultaneously charging a power battery and a storage battery by using an AC power grid is realized by integrating the power supply circuits of the power battery and the storage battery. Specifically, by reusing the H-bridge and adding a voltage regulation circuit on the storage battery side, the dynamic change of the supply voltage of the storage battery is adapted, overcharging or deep discharging of the storage battery is avoided, and the charging efficiency is optimized.

[0004] However, when different types of batteries are used for charging and discharging in the prior art, the objects of charging and discharging are relatively fixed, and flexible switching between different charging modes cannot be performed, and the applicability of the charging circuit is not high. Summary of the Invention

[0005] The purpose of this application is to provide a charging device, a charging method, a battery system, an energy storage device, and a vehicle, aiming to solve the problem that flexible switching between different charging modes cannot be performed and the applicability of the charging circuit is not high.

[0006] In a first aspect, a charging device is provided. The device includes a first power conversion circuit, a switch circuit, a second power conversion circuit, and a control circuit. The first end and the second end of the first power conversion circuit serve as the first charge and discharge ports, and the third end and the fourth end of the first power conversion circuit serve as the second charge and discharge ports. The first end and the second end of the switch circuit are respectively coupled to the fifth end and the sixth end of the first power conversion circuit, and the third end and the fourth end of the switch circuit are respectively coupled to the seventh end and the eighth end of the first power conversion circuit. The first end and the second end of the second power conversion circuit are respectively coupled to the fifth end and the sixth end of the switch circuit, and the third end and the fourth end of the second power conversion circuit serve as charging ports for coupling to an energy storage device. The control circuit is configured to: by controlling different conduction paths of the switch circuit, enable the second power conversion circuit to draw power from the fifth end and the sixth end of the first power conversion circuit and output it from the charging ports, or enable the second power conversion circuit to draw power from the seventh end and the eighth end of the first power conversion circuit and output it from the charging ports.

[0007] The technical solution provided by the embodiments of the present application integrates the first power conversion circuit and the second power conversion circuit. Meanwhile, the switching between different power-taking modes is realized only through the switching circuit. While maintaining the circuit cost, the charging port can efficiently and conveniently select the first charge and discharge port or the second charge and discharge port for power-taking, flexibly adapt to different power demands of the energy storage device, improve the applicable range of the charging device, and meet the diverse needs of users. At the same time, both the first charge and discharge port and the second charge and discharge port can perform the charging and discharging functions, further expanding the applicability of the charging device.

[0008] In one embodiment, the first power conversion circuit includes a first current conversion circuit and a second current conversion circuit. The first end and the second end of the first current conversion circuit are coupled to the first charge and discharge port. The third end and the fourth end of the first current conversion circuit are respectively coupled to the third end and the fourth end of the first power conversion circuit. The fifth end and the sixth end of the first current conversion circuit are respectively coupled to the fifth end and the seventh end of the first power conversion circuit. The first end and the second end of the second current conversion circuit are coupled to the first charge and discharge port. The third end and the fourth end of the second current conversion circuit are respectively coupled to the third end and the fourth end of the first power conversion circuit. The fifth end and the sixth end of the second current conversion circuit are respectively coupled to the sixth end and the eighth end of the first power conversion circuit. The control circuit is specifically configured to: by controlling different conduction paths of the switching circuit, enable the second power conversion circuit to take power from the fifth end of the first current conversion circuit and the fifth end of the second current conversion circuit and output it from the charging port, or enable the second power conversion circuit to take power from the sixth end of the first current conversion circuit and the sixth end of the second current conversion circuit and output it from the charging port. Through the parallel-connected first current conversion circuit and second current conversion circuit, while enabling the charging port to flexibly select the first charge and discharge port or the second charge and discharge port for power-taking, the first current conversion circuit and the second current conversion circuit are respectively adjusted, so that the voltage magnitudes output to the second charge and discharge port and the charging port can be flexibly controlled, further meeting the power demands of the second charge and discharge port and the charging port.

[0009] In one embodiment, the first current conversion circuit includes a first primary-side circuit, a first transformer, and a first secondary-side circuit. The first end and the second end of the first primary-side circuit are respectively used as the first end and the second end of the first current conversion circuit, and the third end of the first primary-side circuit is used as the fifth end of the first current conversion circuit. The first end and the second end of the first transformer are coupled to the third end and the fourth end of the first primary-side circuit. The first end and the second end of the first secondary-side circuit are respectively coupled to the third end and the fourth end of the first transformer, the third end and the fourth end of the first secondary-side circuit are respectively used as the third end and the fourth end of the first current conversion circuit, and the first end of the first secondary-side circuit is used as the sixth end of the first current conversion circuit. Through the first transformer and the first primary-side circuit and the first secondary-side circuit on both sides of the first transformer, while achieving efficient energy conversion, it is possible to effectively isolate the input and output of the first current conversion circuit, improving the safety of the circuit during use. And it is possible to flexibly adjust the output voltage of the circuit by adjusting the duty cycle, phase difference, switching frequency, etc., to adapt to different power demands, and the flexibility of the circuit is higher.

[0010] In one embodiment, the second current conversion circuit includes a second primary-side circuit, a second transformer, and a second secondary-side circuit. The first end and the second end of the second primary-side circuit are respectively used as the first end and the second end of the second current conversion circuit, and the third end of the second primary-side circuit is used as the fifth end of the second current conversion circuit. The first end and the second end of the second transformer are coupled to the third end and the fourth end of the second primary-side circuit. The first end and the second end of the second secondary-side circuit are respectively coupled to the third end and the fourth end of the second transformer, the third end and the fourth end of the second secondary-side circuit are respectively used as the third end and the fourth end of the second current conversion circuit, and the first end of the second primary-side circuit is used as the sixth end of the second current conversion circuit. Through the second transformer and the second primary-side circuit and the second secondary-side circuit on both sides of the second transformer, while achieving efficient energy conversion, it is possible to effectively isolate the input and output of the second current conversion circuit, improving the safety of the circuit during use. And it is possible to flexibly adjust the output voltage of the circuit by adjusting the duty cycle, phase difference, switching frequency, etc., to adapt to different power demands, and the flexibility of the circuit is higher.

[0011] In one embodiment, the first primary-side circuit, the second primary-side circuit, the first secondary-side circuit, and the second secondary-side circuit are half-bridge circuits. The half-bridge circuit has a simple structure and a relatively low control complexity, and can achieve a higher power density. Moreover, the first current conversion circuit and the second current conversion circuit are connected in parallel. While powering the second charge and discharge port, the half-bridge circuits on one side of the first current conversion circuit and the second current conversion circuit can form an additional power transmission path to supply power to the charging port, realizing simultaneous power supply to the second charge and discharge port and the charging port, and the two output voltages can be adjusted separately, eliminating the need for an additional voltage regulation circuit in the device and reducing the circuit integration cost.

[0012] In one embodiment, the first primary-side circuit includes a first bridge arm circuit, a first capacitor, and a second capacitor. The first end and the second end of the first bridge arm circuit serve as the first end and the second end of the first primary-side circuit respectively, and the third end of the first bridge arm circuit serves as the third end of the first primary-side circuit. The first end of the first capacitor is coupled to the first end of the first bridge arm circuit. The first end of the second capacitor is coupled to the second end of the first capacitor, and the second end of the second capacitor is coupled to the second end of the first bridge arm circuit. The common connection end of the first capacitor and the second capacitor serves as the fourth end of the first primary-side circuit.

[0013] In one embodiment, the first secondary-side circuit includes a second bridge arm circuit, a third capacitor, and a fourth capacitor. The first end and the second end of the second bridge arm circuit serve as the third end and the fourth end of the first secondary-side circuit respectively, and the third end of the second bridge arm circuit serves as the first end of the first secondary-side circuit. The first end of the third capacitor is coupled to the first end of the second bridge arm circuit. The first end of the fourth capacitor is coupled to the second end of the third capacitor, and the second end of the fourth capacitor is coupled to the second end of the second bridge arm circuit. The common connection end of the third capacitor and the fourth capacitor serves as the second end of the first secondary-side circuit.

[0014] In one embodiment, the second primary-side circuit includes a third bridge arm circuit, a fifth capacitor, and a sixth capacitor. The first end and the second end of the third bridge arm circuit serve as the first end and the second end of the second primary-side circuit respectively, and the third end of the third bridge arm circuit serves as the third end of the second primary-side circuit. The first end of the fifth capacitor is coupled to the first end of the third bridge arm circuit. The first end of the sixth capacitor is coupled to the second end of the fifth capacitor, and the second end of the sixth capacitor is coupled to the second end of the third bridge arm circuit. The common connection end of the fifth capacitor and the sixth capacitor serves as the fourth end of the second primary-side circuit.

[0015] In one embodiment, the second secondary-side circuit includes a fourth bridge arm circuit, a seventh capacitor, and an eighth capacitor. The first end and the second end of the fourth bridge arm circuit serve as the third end and the fourth end of the second secondary-side circuit respectively, and the third end of the fourth bridge arm circuit serves as the first end of the second secondary-side circuit. The first end of the seventh capacitor is coupled to the first end of the fourth bridge arm circuit. The first end of the eighth capacitor is coupled to the second end of the seventh capacitor, and the second end of the eighth capacitor is coupled to the second end of the fourth bridge arm circuit. The common connection end of the seventh capacitor and the eighth capacitor serves as the second end of the second secondary-side circuit.

[0016] In one embodiment, the first primary-side circuit, the second primary-side circuit, the first secondary-side circuit, and the second secondary-side circuit are full-bridge circuits. Compared with half-bridge circuits, full-bridge circuits have a higher voltage utilization rate, more flexible and stable energy flow, and can adapt to a wider range of voltage conversions.

[0017] In one embodiment, the first primary-side circuit includes a first-phase bridge arm and a second-phase bridge arm. The first end and the second end of the first-phase bridge arm serve as the first end and the second end of the first primary-side circuit respectively, and the third end of the first-phase bridge arm serves as the third end of the first primary-side circuit. The first end and the second end of the second-phase bridge arm are respectively coupled to the first end and the second end of the first-phase bridge arm, and the third end of the second-phase bridge arm serves as the fourth end of the first primary-side circuit.

[0018] In one embodiment, the first secondary-side circuit includes a third-phase bridge arm and a fourth-phase bridge arm. The first end and the second end of the third-phase bridge arm serve as the third end and the fourth end of the first secondary-side circuit respectively, and the third end of the third-phase bridge arm serves as the first end of the first secondary-side circuit. The first end and the second end of the fourth-phase bridge arm are respectively coupled to the first end and the second end of the third-phase bridge arm, and the third end of the fourth-phase bridge arm serves as the second end of the first secondary-side circuit.

[0019] In one embodiment, the second primary-side circuit includes a fifth-phase bridge arm and a sixth-phase bridge arm. The first end and the second end of the fifth-phase bridge arm serve as the first end and the second end of the second primary-side circuit respectively, and the third end of the fifth-phase bridge arm serves as the third end of the second primary-side circuit. The first end and the second end of the sixth-phase bridge arm are respectively coupled to the first end and the second end of the fifth-phase bridge arm, and the third end of the sixth-phase bridge arm serves as the fourth end of the second primary-side circuit.

[0020] In one embodiment, the second secondary-side circuit includes a seventh-phase bridge arm and an eighth-phase bridge arm. The first end and the second end of the seventh-phase bridge arm serve as the third end and the fourth end of the second secondary-side circuit respectively, and the third end of the seventh-phase bridge arm serves as the first end of the second secondary-side circuit. The first end and the second end of the eighth-phase bridge arm are respectively coupled to the first end and the second end of the seventh-phase bridge arm, and the third end of the eighth-phase bridge arm serves as the second end of the second secondary-side circuit.

[0021] In one embodiment, the switching circuit includes a first switch and a second switch. The first end of the first switch serves as the first end of the switching circuit, the second end of the first switch serves as the fourth end of the switching circuit, and the third end of the first switch serves as the fifth end of the switching circuit. The first end of the second switch serves as the second end of the switching circuit, the second end of the second switch serves as the third end of the switching circuit, and the third end of the second switch serves as the sixth end of the switching circuit. The control circuit is specifically configured to: make the first end and the third end of the first switch conduct, and make the first end and the third end of the second switch conduct, so that the second power conversion circuit draws power from the fifth end and the sixth end of the first power conversion circuit; make the second end and the third end of the first switch conduct, and make the second end and the third end of the second switch conduct, so that the second power conversion circuit draws power from the seventh end and the eighth end of the first power conversion circuit. The cost of the single-pole double-throw switch is relatively low, and by using the single-pole double-throw switch, it can be avoided that the second power conversion circuit draws power from the fifth end, the sixth end, the seventh end and the eighth end of the first power conversion circuit at the same time, thereby avoiding circuit damage and faults and improving the stability of the circuit operation.

[0022] In one embodiment, the second power conversion circuit includes a third transformer and a rectifier circuit. The first end and the second end of the third transformer serve as the first end and the second end of the second power conversion circuit respectively. The first end and the second end of the rectifier circuit are respectively coupled to the third end and the fourth end of the third transformer, and the third end and the fourth end of the rectifier circuit serve as the third end and the fourth end of the second power conversion circuit. Through the third transformer and the rectifier circuit, the voltage output to the energy storage device is adjusted and stabilized, and the charging quality is improved.

[0023] In one embodiment, the rectifier circuit includes: a fifth bridge arm circuit, a first inductor and a ninth capacitor. The first end and the second end of the fifth bridge arm circuit serve as the first end and the second end of the rectifier circuit respectively, and the third end of the fifth bridge arm circuit serves as the fourth end of the rectifier circuit. One end of the first inductor is coupled to the tap of the third transformer, and the second end of the first inductor is coupled to the third end of the rectifier circuit. The first end of the ninth capacitor is coupled to the third end of the rectifier circuit, and the second end of the ninth capacitor is coupled to the fourth end of the rectifier circuit. Rectification and voltage stabilization are achieved through the fifth bridge arm circuit, the first inductor and the ninth capacitor. The rectification efficiency is high, the response speed is fast, and at the same time, the energy feedback of the energy storage transposition is supported, further improving the applicability of the circuit.

[0024] In one embodiment, the control circuit is further configured to: in response to determining that the second charge and discharge port draws power from the first power conversion circuit, or the first charge and discharge port draws power from the first power conversion circuit, control the magnitude of the voltage output by the first power conversion circuit to the first charge and discharge port or the second charge and discharge port by adjusting the duty cycle of the first power conversion circuit. By adjusting the duty cycle to control the magnitude of the voltage output to the first charge and discharge port or the second charge and discharge port, the adjustment efficiency and accuracy are high, and the power consumption requirements of the first charge and discharge port or the second charge and discharge port can be efficiently met.

[0025] In one embodiment, the control circuit is further configured to: control the upper half-bridges of the first bridge arm circuit and the second bridge arm circuit to conduct in a first time period, and control the lower half-bridges of the first bridge arm circuit and the second bridge arm circuit to conduct in a second time period. By adjusting the durations of the first time period and the second time period, control the magnitude of the voltage output by the first power conversion circuit to the first charge and discharge port or the second charge and discharge port.

[0026] In one embodiment, the control circuit is further configured to: in response to determining that the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit and the second charge and discharge port draws power from the first power conversion circuit, or in response to determining that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and the first charge and discharge port draws power from the first power conversion circuit, control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit by adjusting the phase difference between the first current conversion circuit and the second current conversion circuit. While adjusting the magnitude of the voltage output to the first charge and discharge port or the second charge and discharge port by adjusting the duty cycle, based on the first current conversion circuit and the second current conversion circuit connected in parallel, adjust the magnitude of the voltage output to the charging port by adjusting the phase difference, that is, the voltage output to different ports in multiple charging modes can be flexibly adjusted through the first power circuit, reducing the circuit cost while increasing the flexibility of circuit control.

[0027] In one embodiment, the control circuit is further configured to: control the upper half-bridges of the first bridge arm circuit and the second bridge arm circuit to conduct in a first time period, and control the lower half-bridges of the first bridge arm circuit and the second bridge arm circuit to conduct in a second time period. Control the upper half-bridges of the third bridge arm circuit and the fourth bridge arm circuit to conduct in a third time period, and control the lower half-bridges of the third bridge arm circuit and the fourth bridge arm circuit to conduct in a fourth time period. By adjusting the offset of the first time period and the third time period, or adjusting the offset of the second time period and the fourth time period, control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit.

[0028] In one embodiment, the control circuit is further configured to: in response to determining that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and the first charge and discharge port does not draw power from the first power conversion circuit, control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit by adjusting the duty cycle or phase difference of the first current conversion circuit and the second current conversion circuit.

[0029] In one embodiment, the first power conversion circuit further includes: an AC-DC conversion circuit. The first terminal and the second terminal of the AC-DC conversion circuit serve as the first terminal and the second terminal of the first power conversion circuit, and the third terminal and the fourth terminal of the AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first current conversion circuit, and the third terminal and the fourth terminal of the AC-DC conversion circuit are also respectively coupled to the first terminal and the second terminal of the second current conversion circuit. Through the AC-DC conversion circuit, flexible switching between AC and DC can be achieved, adapting to more application scenarios.

[0030] In one embodiment, the first power conversion circuit further includes: a first AC-DC conversion circuit and a second AC-DC conversion circuit. The first terminal and the second terminal of the first AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first power conversion circuit, and the third terminal and the fourth terminal of the first AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first current conversion circuit. The first terminal and the second terminal of the second AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first power conversion circuit, and the third terminal and the fourth terminal of the second AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the second current conversion circuit. The first current conversion circuit and the second current conversion circuit are respectively connected to the AC-DC conversion circuit, improving the efficiency of AC-DC conversion and reducing the interference between the first current conversion circuit and the second current conversion circuit.

[0031] In one embodiment, the AC-DC conversion circuit is a power factor correction (PFC) circuit. By performing AC-DC conversion through the power factor correction circuit, the utilization rate of electric energy can be improved, while harmonic interference is reduced, thereby improving the stability of the entire circuit.

[0032] In one embodiment, the power factor correction circuit includes a ninth phase bridge arm, a second inductor, a tenth phase bridge arm, and a tenth capacitor. The first terminal and the second terminal of the ninth phase bridge arm serve as the third terminal and the fourth terminal of the power factor correction circuit respectively, the first terminal of the second inductor serves as the first terminal of the power factor correction circuit, and the second terminal of the second inductor is coupled to the third terminal of the ninth phase bridge arm. The first terminal and the second terminal of the tenth phase bridge arm serve as the third terminal and the fourth terminal of the power factor correction circuit respectively, and the third terminal of the tenth phase bridge arm serves as the second terminal of the power factor correction circuit. The first terminal and the second terminal of the tenth capacitor are respectively coupled to the third terminal and the fourth terminal of the power factor correction circuit.

[0033] In a second aspect, a charging method is further provided. The charging method is applied to the charging device in the first aspect above. The charging method includes:

[0034] Obtain a charging mode.

[0035] Based on the charging mode, control different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit and outputs it through the charging port, or so that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and outputs it through the charging port.

[0036] For the technical solution provided in the embodiments of the present application, different power-taking methods correspond to different charging modes, enabling the charging port to efficiently and conveniently select the first charge and discharge port or the second charge and discharge port for power-taking, flexibly adapting to the charging requirements of different charging modes, and improving user satisfaction.

[0037] In one implementation, based on the charging mode, controlling different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit and outputs it through the charging port, or so that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and outputs it through the charging port, can be specifically implemented as: in response to determining that the first charge and discharge port supplies power to the energy storage device, control different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit and outputs it through the charging port. In response to determining that the second charge and discharge port supplies power to the energy storage device, control different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and outputs it through the charging port. Flexible power-taking of the second power conversion circuit is achieved.

[0038] In one implementation, the charging method provided in the embodiments of the present application further includes: in response to determining that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and the first charge and discharge port does not draw power from the first power conversion circuit, adjust the duty cycle or phase difference of the first current conversion circuit and the second current conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit.

[0039] In one embodiment, the charging method provided by the embodiments of the present application further includes: in response to determining that the first charge and discharge port supplies power to the second charge and discharge port, the second power conversion circuit draws power from the fifth and sixth ends of the first power conversion circuit, or in response to determining that the second charge and discharge port supplies power to the first charge and discharge port, the second power conversion circuit draws power from the seventh and eighth ends of the first power conversion circuit, and adjusts the phase difference between the first current conversion circuit and the second current conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit.

[0040] In one embodiment, the charging method provided by the embodiments of the present application further includes: in response to determining that the first charge and discharge port supplies power to the second charge and discharge port, or the second charge and discharge port supplies power to the first charge and discharge port, adjusting the duty cycle of the first power conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the first charge and discharge port or the second charge and discharge port.

[0041] In a third aspect, a battery system is provided. The battery system includes an AC power grid, a battery, an energy storage device, and the charging device according to any one of the embodiments in the first aspect above. The AC power grid is coupled to the first charge and discharge port, the battery is coupled to the second charge and discharge port, the energy storage device is coupled to the charging port, or the charging method according to any one of the embodiments in the second aspect above is applied for charging.

[0042] In a fourth aspect, an energy storage device is provided. The energy storage device includes the charging device according to any one of the embodiments in the first aspect above, or includes the battery system according to the third aspect above, or the charging method according to any one of the embodiments in the second aspect above is applied for charging.

[0043] In a fifth aspect, a vehicle is provided. The vehicle includes a vehicle body and the charging device according to any one of the embodiments in the first aspect above, or includes a vehicle body and the battery system according to the third aspect above, or includes a vehicle body and the energy storage device according to the fourth aspect above, or the charging method according to any one of the embodiments in the second aspect above is applied for charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 FIG. is a schematic structural diagram of an energy storage device provided by an embodiment of the present application;

[0046] Figure 2Schematic diagram of the structure of a charging device provided by an embodiment of the present application;

[0047] Figure 3 Schematic diagram of the structure of another charging device provided by an embodiment of the present application;

[0048] Figure 4 Schematic diagram of the circuit structure of a charging device provided by an embodiment of the present application;

[0049] Figure 5 Schematic diagram of the circuit structure of another charging device provided by an embodiment of the present application;

[0050] Figure 6 Schematic diagram of the control timing of a switching tube provided by an embodiment of the present application;

[0051] Figure 7 Schematic diagram of the control timing of another switching tube provided by an embodiment of the present application;

[0052] Figure 8 Schematic diagram of the control timing of yet another switching tube provided by an embodiment of the present application;

[0053] Figure 9 Schematic diagram of the conduction circuit of a switching circuit provided by an embodiment of the present application;

[0054] Figure 10 Schematic diagram of the structure of an AC-DC conversion circuit provided by an embodiment of the present application;

[0055] Figure 11 Schematic diagram of the flow of a charging method provided by an embodiment of the present application;

[0056] Figure 12 Schematic diagram of the flow of another charging method provided by an embodiment of the present application.

[0057] Reference numerals:

[0058] 100, AC power grid;

[0059] 200, battery;

[0060] 300, energy storage device;

[0061] 400, charging device;

[0062] 40, first power conversion circuit;

[0063] 40a, first current conversion circuit;

[0064] T1, the first transformer; Q1, the first switch; Q2, the second switch; Q3, the third switch; Q4, the fourth switch; C1, the first capacitor; C2, the second capacitor; C3, the third capacitor; C4, the fourth capacitor;

[0065] 1, the first phase bridge arm; 2, the second phase bridge arm; 3, the third phase bridge arm; 4, the fourth phase bridge arm;

[0066] 40b, the second current conversion circuit;

[0067] T2, the second transformer; Q5, the fifth switch; Q6, the sixth switch; Q7, the seventh switch; Q8, the eighth switch; C5, the fifth capacitor; C6, the sixth capacitor; C7, the seventh capacitor; C8, the eighth capacitor;

[0068] 5, the fifth phase bridge arm; 6, the sixth phase bridge arm; 7, the seventh phase bridge arm; 8, the eighth phase bridge arm;

[0069] 40c, the AC-DC conversion circuit;

[0070] 40d, the first AC-DC conversion circuit; 40e, the second AC-DC conversion circuit;

[0071] 9, the ninth phase bridge arm; 10, the tenth phase bridge arm; C10, the tenth capacitor; L2, the second inductor;

[0072] 41, the second electric energy conversion circuit;

[0073] T3, the third transformer; Q9, the ninth switch; Q10, the tenth switch; C9, the ninth capacitor; L1, the first inductor;

[0074] 43, the first charge and discharge port; 44, the second charge and discharge port; 45, the charging port. Detailed implementation manners

[0075] In the embodiments of the present application, the terms "first", "second", "third", "fourth", "fifth", "sixth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth", "fifth", "sixth" may explicitly or implicitly include one or more of such features.

[0076] In the embodiments of the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising that element. "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0077] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components have direct physical or electrical contact with each other. Another example is that when describing some embodiments, the term "coupled" may be used to indicate that two or more components have direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also mean that two or more components do not have direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0078] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner. In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0079] The present application provides a vehicle, which is also referred to as a means of transportation (vehicle), a mobile carrier, etc., including but not limited to sedans, sport utility vehicles (SUVs), trucks, electric vehicles, motorcycles, tricycles, driverless taxis, intelligent and connected buses, autonomous logistics vehicles, electric trucks, electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles (FCVs), autonomous vehicles, intelligent and connected vehicles (ICVs), driverless vehicles, special vehicles (such as ambulances, fire trucks, police cars, etc.), agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, etc. The present application does not make specific limitations thereto.

[0080] In some embodiments, the vehicle includes a vehicle body and an energy storage device, and the energy storage device is disposed within the vehicle body.

[0081] Optionally, the energy storage device includes a lithium battery energy storage device, a lead-acid battery energy storage device, a liquid fluid battery energy storage device, a solid-state battery energy storage device, etc.

[0082] In some embodiments, the energy storage device is also applied to the field of electric energy (such as power grid peak shaving and frequency modulation, power generation systems, power supply systems), the field of rail transit (such as subways, high-speed rails), the fields of ships and aviation (such as aircraft), and the industrial field, etc. The present application does not limit this.

[0083] In some embodiments, the energy storage device includes a battery system.

[0084] Exemplarily, as Figure 1 shown is a schematic structural diagram of a battery system provided by an embodiment of the present application. The battery system includes an AC power grid 100, a battery 200, an energy storage device 300, and a charging device 400. Among them, the external interfaces of the charging device 400 include a first charge and discharge port 43, a second charge and discharge port 44, and a charging port 45. The AC power grid 100 is coupled to the first charge and discharge port 43, the battery 200 is coupled to the second charge and discharge port 44, and the energy storage device 300 is coupled to the charging port 45.

[0085] Optionally, the AC power grid 100 charges the energy storage device 300 through the charging device 400; alternatively, the battery 200 charges the energy storage device 300 through the charging device 400; alternatively, the AC power grid 100 simultaneously charges the battery 200 and the energy storage device 300 through the charging device 400; alternatively, the battery 200 performs inverter discharge on the AC power grid 100 through the charging device 400, and the charging device 400 charges the energy storage device 300. This application does not limit this.

[0086] In some embodiments, as Figure 2 shown, a charging device provided by an embodiment of the present application includes: a first power conversion circuit 40, a switch circuit 41, a second power conversion circuit 42, and a control circuit. The first end and the second end of the first power conversion circuit 40 serve as a first charge and discharge port 43, and the third end and the fourth end of the first power conversion circuit 40 serve as a second charge and discharge port 44. The first end and the second end of the switch circuit 41 are respectively coupled to the fifth end and the sixth end of the first power conversion circuit 40, and the third end and the fourth end of the switch circuit 41 are respectively coupled to the seventh end and the eighth end of the first power conversion circuit 40. The first end and the second end of the second power conversion circuit 42 are respectively coupled to the fifth end and the sixth end of the switch circuit 41, and the third end and the fourth end of the second power conversion circuit 42 serve as a charging port 45 for coupling to an energy storage device.

[0087] Optionally, the control circuit is configured to: by controlling different conduction paths of the switch circuit 41, enable the second power conversion circuit 42 to draw power from the fifth end and the sixth end of the first power conversion circuit 40 and output it from the charging port 45, or enable the second power conversion circuit 42 to draw power from the seventh end and the eighth end of the first power conversion circuit 40 and output it from the charging port 45.

[0088] Among them, the first power conversion circuit 40 is used to convert, step - down, etc. the electric energy input to the first charge and discharge port 43, and output the processed electric energy to the second charge and discharge port 44 and / or the second power conversion circuit 42. Or, the first power conversion circuit 40 is further used to process the electric energy input to the second charge and discharge port 44, and output the processed electric energy to the first charge and discharge port 43 and / or the second power conversion circuit.

[0089] Optionally, the first power conversion circuit 40 includes a rectification circuit, an AC - DC conversion circuit, a voltage conversion circuit, and an inverter circuit.

[0090] The second power conversion circuit 42 is used to process the electric energy output by the first power conversion circuit 40, and output the processed electric energy to the charging port for charging.

[0091] Optionally, the second power conversion circuit includes a direct current-direct current (DC-DC) conversion circuit, a rectification circuit, a voltage transformation circuit, etc.

[0092] For example, when the charging device is applied to a vehicle, the first charge and discharge port 43 is connected to an AC power source, the second charge and discharge port 44 is connected to the vehicle's power battery, and the charging port 45 is connected to the vehicle's battery. The first power conversion circuit 40 converts the alternating current output by the AC power source into direct current to charge the vehicle's power battery and battery; or, when the vehicle is running, the power output by the power battery is transmitted to the second power conversion circuit 42 through the first power conversion circuit 40, and then the second power conversion circuit 42 charges the battery; or, when the vehicle's power battery is in an inverter discharge state and the battery is being charged, the first power conversion circuit 40 simultaneously converts the direct current of the power battery into alternating current and feeds it back to the first charge and discharge port 43 for use by external devices or to be fed back to the AC power grid.

[0093] In one embodiment, the first power conversion circuit 40 includes a first current conversion circuit 40a and a second current conversion circuit 40b. The first end and the second end of the first current conversion circuit 40a are coupled to the first charge and discharge port 43. The third end and the fourth end of the first current conversion circuit 40a are respectively coupled to the third end and the fourth end of the first power conversion circuit 40. The fifth end and the sixth end of the first current conversion circuit 40a are respectively coupled to the fifth end and the seventh end of the first power conversion circuit 40. The first end and the second end of the second current conversion circuit 40b are coupled to the first charge and discharge port 43. The third end and the fourth end of the second current conversion circuit 40b are respectively coupled to the third end and the fourth end of the first power conversion circuit 40. The fifth end and the sixth end of the second current conversion circuit 40b are respectively coupled to the sixth end and the eighth end of the first power conversion circuit 40.

[0094] Optionally, the control circuit is specifically configured to: by controlling different conduction paths of the switch circuit 41, enable the second power conversion circuit 42 to draw power from the fifth end of the first current conversion circuit 40a and the fifth end of the second current conversion circuit 40b and output it from the charging port 45, or enable the second power conversion circuit 42 to draw power from the sixth end of the first current conversion circuit 40a and the sixth end of the second current conversion circuit 40b and output it from the charging port 45.

[0095] Exemplarily, the first current conversion circuit 40a and the second current conversion circuit 40b are DC-DC conversion circuits. By controlling the first current conversion circuit 40a and the second current conversion circuit 40b respectively, the magnitude of the output from the fifth terminal of the first current conversion circuit 40a and the fifth terminal of the second current conversion circuit 40b to the second power conversion circuit 42 can be controlled, or the magnitude of the output from the sixth terminal of the first current conversion circuit 40a and the sixth terminal of the second current conversion circuit 40b to the second power conversion circuit 42 can be controlled to meet the charging voltage requirements of the charging port. There is no need to separately provide a voltage regulation circuit for the second power conversion circuit 42, reducing the circuit cost.

[0096] Specifically, as Figure 3 shown, the first current conversion circuit 40a includes a first primary side circuit, a first transformer T1, and a first secondary side circuit. The first terminal and the second terminal of the first primary side circuit are respectively used as the first terminal and the second terminal of the first current conversion circuit 40a, and the third terminal of the first primary side circuit is used as the fifth terminal of the first current conversion circuit 40a. The first terminal and the second terminal of the first transformer T1 are coupled to the third terminal and the fourth terminal of the first primary side circuit. The first terminal and the second terminal of the first secondary side circuit are respectively coupled to the third terminal and the fourth terminal of the first transformer T1, the third terminal and the fourth terminal of the first secondary side circuit are respectively used as the third terminal and the fourth terminal of the first current conversion circuit 40a, and the first terminal of the first secondary side circuit is used as the sixth terminal of the first current conversion circuit 40a.

[0097] The second current conversion circuit 40b includes a second primary side circuit, a second transformer T2, and a second secondary side circuit. The first terminal and the second terminal of the second primary side circuit are respectively used as the first terminal and the second terminal of the second current conversion circuit 40b, and the third terminal of the second primary side circuit is used as the fifth terminal of the second current conversion circuit 40b. The first terminal and the second terminal of the second transformer T2 are coupled to the third terminal and the fourth terminal of the second primary side circuit. The first terminal and the second terminal of the second secondary side circuit are respectively coupled to the third terminal and the fourth terminal of the second transformer T2, the third terminal and the fourth terminal of the second secondary side circuit are respectively used as the third terminal and the fourth terminal of the second current conversion circuit 40b, and the first terminal of the second primary side circuit is used as the sixth terminal of the second current conversion circuit 40b.

[0098] Among them, the first primary side circuit, the first secondary side circuit, the second primary side circuit, and the second secondary side circuit are used for AC-DC conversion and also for controlling the magnitude of the output voltage of the first power conversion circuit 40.

[0099] In some embodiments, the first primary side circuit, the second primary side circuit, the first secondary side circuit, and the second secondary side circuit are half-bridge circuits.

[0100] Among them, the half-bridge circuit consists of two switching devices and two capacitors.

[0101] Optionally, the switching device includes a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) MOSFET, etc.

[0102] Exemplarily, as Figure 4 shown, the first primary-side circuit includes a first leg circuit, a first capacitor C1, and a second capacitor C2. The first end and the second end of the first leg circuit are respectively used as the first end and the second end of the first primary-side circuit, and the third end of the first leg circuit is used as the third end of the first primary-side circuit. The first end of the first capacitor C1 is coupled to the first end of the first leg circuit. The first end of the second capacitor C2 is coupled to the second end of the first capacitor C1, the second end of the second capacitor C2 is coupled to the second end of the first leg circuit, and the common connection end of the first capacitor and the second capacitor is used as the fourth end of the first primary-side circuit.

[0103] Among them, the third end of the first leg circuit refers to the connection point between the upper half bridge and the lower half bridge of the first leg circuit. Specifically, as Figure 4 shown, the first leg circuit includes a first switching tube Q1 and a second switching tube Q2 connected in series, and the connection point of the first switching tube Q1 and the second switching tube Q2 is used as the third end of the first leg circuit. Each switching tube is connected in parallel with a diode that can realize functions such as freewheeling and preventing reverse voltage breakdown.

[0104] The upper half bridge and the lower half bridge of the first leg circuit do not conduct simultaneously. Exemplarily, when the upper half bridge of the first leg circuit conducts, the current direction is from the first end of the first leg circuit, through the first switching tube Q1, the third end of the first leg circuit, the first transformer T1, the fourth end of the first leg circuit, the second capacitor C2, to the second end of the first leg circuit. When the lower half bridge of the first leg circuit conducts, the current direction is from the first end of the first leg circuit, through the first capacitor C1, the fourth end of the first leg circuit, the first transformer T1, the third end of the first leg circuit, the second switching tube Q2, to the second end of the first leg circuit.

[0105] Exemplarily, the first secondary-side circuit includes a second bridge arm circuit, a third capacitor C3, and a fourth capacitor C4. The first end and the second end of the second bridge arm circuit serve as the third end and the fourth end of the first secondary-side circuit respectively, and the third end of the second bridge arm circuit serves as the first end of the first secondary-side circuit. The first end of the third capacitor C3 is coupled to the first end of the second bridge arm circuit. The first end of the fourth capacitor C4 is coupled to the second end of the third capacitor C3, the second end of the fourth capacitor C4 is coupled to the second end of the second bridge arm circuit, and the common connection end of the third capacitor C3 and the fourth capacitor C4 serves as the second end of the first secondary-side circuit.

[0106] Wherein, the third end of the second bridge arm circuit refers to the connection point between the upper half bridge and the lower half bridge of the second bridge arm circuit. Specifically, as Figure 4 shown, the second bridge arm circuit includes a third switch tube Q3 and a fourth switch tube Q4 connected in series, and the connection point of the third switch tube Q3 and the fourth switch tube Q4 serves as the third end of the second bridge arm circuit. Each switch tube is connected in parallel with a diode that can perform functions such as freewheeling and preventing reverse voltage breakdown.

[0107] The upper half bridge and the lower half bridge of the second bridge arm circuit do not conduct simultaneously. Exemplarily, when the upper half bridge of the second bridge arm circuit conducts, the current direction is from the third end of the second bridge arm circuit, through the third switch tube Q3, to the first end of the second bridge arm circuit, then to the second charge and discharge port 44, to the second end of the second bridge arm circuit, through the fourth capacitor C4, and to the second end of the first secondary-side circuit. When the lower half bridge of the second bridge arm circuit conducts, the current direction is from the second end of the first secondary-side circuit, through the third capacitor C3, to the first end of the second bridge arm circuit, then to the second charge and discharge port 44, to the second end of the second bridge arm circuit, through the fourth switch tube Q4, and to the third end of the second bridge arm circuit.

[0108] Exemplarily, the second primary-side circuit includes a third bridge arm circuit, a fifth capacitor C5, and a sixth capacitor C6. The first end and the second end of the third bridge arm circuit serve as the first end and the second end of the second primary-side circuit respectively, and the third end of the third bridge arm circuit serves as the third end of the second primary-side circuit. The first end of the fifth capacitor C5 is coupled to the first end of the third bridge arm circuit. The first end of the sixth capacitor C6 is coupled to the second end of the fifth capacitor C5, the second end of the sixth capacitor C6 is coupled to the second end of the third bridge arm circuit, and the common connection end of the fifth capacitor C5 and the sixth capacitor C6 serves as the fourth end of the second primary-side circuit.

[0109] Wherein, the third end of the third bridge arm circuit refers to the connection point between the upper half bridge and the lower half bridge of the third bridge arm circuit. Specifically, as Figure 4 shown, the third bridge arm circuit includes a fifth switch tube Q5 and a sixth switch tube Q6 connected in series, and the connection point of the fifth switch tube Q5 and the sixth switch tube Q6 serves as the third end of the third bridge arm circuit. Each switch tube is connected in parallel with a diode that can perform functions such as freewheeling and preventing reverse voltage breakdown.

[0110] The upper half-bridge and the lower half-bridge of the third bridge arm circuit are not conducting simultaneously. Exemplarily, when the upper half-bridge of the third bridge arm circuit is conducting, the current direction is from the first end of the third bridge arm circuit, through the fifth switching device Q5, to the third end of the third bridge arm circuit, then through the second transformer T2, to the fourth end of the third bridge arm circuit, then through the sixth capacitor C6, to the second end of the third bridge arm circuit. When the lower half-bridge of the third bridge arm circuit is conducting, the current direction is from the first end of the third bridge arm circuit, through the fifth capacitor C5, to the fourth end of the third bridge arm circuit, then through the second transformer T2, to the third end of the third bridge arm circuit, then through the sixth switching device Q6, to the second end of the third bridge arm circuit.

[0111] Exemplarily, the second secondary side circuit includes a fourth bridge arm circuit, a seventh capacitor C7, and an eighth capacitor C8. The first end and the second end of the fourth bridge arm circuit are respectively used as the third end and the fourth end of the second secondary side circuit, and the third end of the fourth bridge arm circuit is used as the first end of the second secondary side circuit. The first end of the seventh capacitor C7 is coupled to the first end of the fourth bridge arm circuit. The first end of the eighth capacitor C8 is coupled to the second end of the seventh capacitor C7, the second end of the eighth capacitor C8 is coupled to the second end of the fourth bridge arm circuit, and the common connection end of the seventh capacitor C7 and the eighth capacitor C8 is used as the second end of the second secondary side circuit.

[0112] Wherein, the third end of the fourth bridge arm circuit refers to the connection point between the upper half-bridge and the lower half-bridge in the second bridge arm circuit. Specifically, as Figure 4 shown, the fourth bridge arm circuit includes a seventh switching device Q7 and an eighth switching device Q8 connected in series, and the connection point of the seventh switching device Q7 and the eighth switching device Q8 is used as the third end of the fourth bridge arm circuit. Each switching device is connected in parallel with a diode that can perform functions such as freewheeling and preventing reverse voltage breakdown.

[0113] The upper half-bridge and the lower half-bridge of the fourth bridge arm circuit are not conducting simultaneously. Exemplarily, when the upper half-bridge of the fourth bridge arm circuit is conducting, the current direction is from the third end of the fourth bridge arm circuit, through the seventh switching device Q7, to the first end of the fourth bridge arm circuit, then through the second charge and discharge port 44, to the second end of the fourth bridge arm circuit, then through the eighth capacitor C8, to the second end of the second secondary side circuit. When the lower half-bridge of the fourth bridge arm circuit is conducting, the current direction is from the second end of the second secondary side circuit, through the seventh capacitor C7, to the first end of the fourth bridge arm circuit, then through the second charge and discharge port 44, to the second end of the fourth bridge arm circuit, then through the eighth switching device Q8, to the third end of the fourth bridge arm circuit.

[0114] In some embodiments, the first primary side circuit, the second primary side circuit, the first secondary side circuit, and the second secondary side circuit are full-bridge circuits.

[0115] Wherein, the full-bridge circuit is composed of four switching devices.

[0116] Exemplarily, asFigure 5 As shown, the first primary-side circuit includes a first phase leg 1 and a second phase leg 2. The first end and the second end of the first phase leg 1 are respectively used as the first end and the second end of the first primary-side circuit, and the third end of the first phase leg 1 is used as the third end of the first primary-side circuit. The first end and the second end of the second phase leg 2 are respectively coupled to the first end and the second end of the first phase leg 1, and the third end of the second phase leg 2 is used as the fourth end of the first primary-side circuit.

[0117] Among them, the third end of the first phase leg 1 is the connection point between the upper half-bridge and the lower half-bridge of the first phase leg 1, and the third end of the second phase leg 2 is the connection point between the upper half-bridge and the lower half-bridge of the second phase leg 2. Specifically, as Figure 5 shown, the first phase leg 1 includes two switching tubes, and the third end of the first phase leg 1 is the connection point of the two switching tubes; the second phase leg 2 includes two switching tubes, and the third end of the second phase leg 2 is the connection point of the two switching tubes. Each switching tube is connected in parallel with a diode that can realize functions such as freewheeling and preventing reverse voltage breakdown.

[0118] The upper half-bridges and the lower half-bridges of the first phase leg 1 and the second phase leg 2 are not conducting simultaneously. When the upper half-bridge of the first phase leg 1 conducts, the lower half-bridge of the second phase leg 2 conducts; when the lower half-bridge of the first phase leg 1 conducts, the upper half-bridge of the second phase leg 2 conducts. Exemplarily, when the upper half-bridge of the first phase leg 1 conducts, the current direction is from the first end of the first phase leg 1, through the upper half-bridge of the first phase leg 1, to the third end of the first phase leg 1, through the first transformer T1, to the third end of the second phase leg 2, through the lower half-bridge of the second phase leg 2, and to the second end of the first phase leg 1. When the upper half-bridge of the second phase leg 2 conducts, the current direction is from the first end of the first phase leg 1, through the upper half-bridge of the second phase leg 2, to the third end of the second phase leg 2, through the first transformer T1, to the third end of the first phase leg 1, through the lower half-bridge of the first phase leg 1, and to the second end of the first phase leg 1.

[0119] Exemplarily, the first secondary-side circuit includes a third phase leg 3 and a fourth phase leg 4. The first end and the second end of the third phase leg 3 are respectively used as the third end and the fourth end of the first secondary-side circuit, and the third end of the third phase leg 3 is used as the first end of the first secondary-side circuit. The first end and the second end of the fourth phase leg 4 are respectively coupled to the first end and the second end of the third phase leg 3, and the third end of the fourth phase leg 4 is used as the second end of the first secondary-side circuit.

[0120] Among them, the third end of the third phase leg 3 is the connection point between the upper half-bridge and the lower half-bridge of the third phase leg 3, and the third end of the fourth phase leg 4 is the connection point between the upper half-bridge and the lower half-bridge of the fourth phase leg 4. Specifically, as Figure 5As shown, the third-phase bridge arm 3 includes two switching tubes, and the third end of the third-phase bridge arm 3 is the connection point of the two switching tubes; the fourth-phase bridge arm 4 includes two switching tubes, and the third end of the fourth-phase bridge arm 4 is the connection point of the two switching tubes. Each switching tube is connected in parallel with a diode that can perform functions such as freewheeling and preventing reverse voltage breakdown.

[0121] The upper half bridge and the lower half bridge of the third-phase bridge arm 3 and the fourth-phase bridge arm 4 are not conducting simultaneously. When the upper half bridge of the third-phase bridge arm 3 conducts, the lower half bridge of the fourth-phase bridge arm 4 conducts; when the lower half bridge of the third-phase bridge arm 3 conducts, the upper half bridge of the fourth-phase bridge arm 4 conducts. Exemplarily, when the upper half bridge of the third-phase bridge arm 3 conducts, the current flow direction is from the third end of the third-phase bridge arm 3, through the upper half bridge of the third-phase bridge arm 3, the second charge and discharge port 44, the lower half bridge of the fourth-phase bridge arm 4, to the third end of the fourth-phase bridge arm 4. When the upper half bridge of the fourth-phase bridge arm 4 conducts, the current flow direction is from the third end of the fourth-phase bridge arm 4, through the upper half bridge of the fourth-phase bridge arm 4, the second charge and discharge port 44, the lower half bridge of the third-phase bridge arm 3, to the third end of the third-phase bridge arm 3.

[0122] Exemplarily, the second primary side circuit includes a fifth-phase bridge arm 5 and a sixth-phase bridge arm 6. The first end and the second end of the fifth-phase bridge arm 5 are respectively used as the first end and the second end of the second primary side circuit, and the third end of the fifth-phase bridge arm 5 is used as the third end of the second primary side circuit. The first end and the second end of the sixth-phase bridge arm 6 are respectively coupled to the first end and the second end of the fifth-phase bridge arm 5, and the third end of the sixth-phase bridge arm 6 is used as the fourth end of the second primary side circuit.

[0123] Among them, the third end of the fifth-phase bridge arm 5 is the connection point between the upper half bridge and the lower half bridge of the fifth-phase bridge arm 5, and the third end of the sixth-phase bridge arm 6 is the connection point between the upper half bridge and the lower half bridge of the sixth-phase bridge arm 6. Specifically, as Figure 5 shown, the fifth-phase bridge arm 5 includes two switching tubes, and the third end of the fifth-phase bridge arm 5 is the connection point of the two switching tubes; the sixth-phase bridge arm 6 includes two switching tubes, and the third end of the sixth-phase bridge arm 6 is the connection point of the two switching tubes. Each switching tube is connected in parallel with a diode that can perform functions such as freewheeling and preventing reverse voltage breakdown.

[0124] The upper and lower half-bridges of the fifth-phase bridge arm 5 and the sixth-phase bridge arm 6 are not conducting simultaneously. When the upper half-bridge of the fifth-phase bridge arm 5 is conducting, the lower half-bridge of the sixth-phase bridge arm 6 is conducting; when the lower half-bridge of the fifth-phase bridge arm 5 is conducting, the upper half-bridge of the sixth-phase bridge arm 6 is conducting. Exemplarily, when the upper half-bridge of the fifth-phase bridge arm 5 is conducting, the current direction is from the first end of the fifth-phase bridge arm 5, through the upper half-bridge of the fifth-phase bridge arm 5, to the third end of the fifth-phase bridge arm 5, then to the first transformer T1, to the third end of the sixth-phase bridge arm 6, through the lower half-bridge of the sixth-phase bridge arm 6, and back to the second end of the fifth-phase bridge arm 5. When the upper half-bridge of the sixth-phase bridge arm 6 is conducting, the current direction is from the first end of the fifth-phase bridge arm 5, through the upper half-bridge of the sixth-phase bridge arm 6, to the third end of the sixth-phase bridge arm 6, then to the first transformer T1, to the third end of the fifth-phase bridge arm 5, through the lower half-bridge of the fifth-phase bridge arm 5, and back to the second end of the fifth-phase bridge arm 5.

[0125] Exemplarily, the second secondary-side circuit includes a seventh-phase bridge arm 7 and an eighth-phase bridge arm 8. The first end and the second end of the seventh-phase bridge arm 7 serve as the third end and the fourth end of the second secondary-side circuit respectively, and the third end of the seventh-phase bridge arm 7 serves as the first end of the second secondary-side circuit. The first end and the second end of the eighth-phase bridge arm 8 are respectively coupled to the first end and the second end of the seventh-phase bridge arm 7, and the third end of the eighth-phase bridge arm 8 serves as the second end of the second secondary-side circuit.

[0126] Wherein, the third end of the seventh-phase bridge arm 7 is the connection point between the upper half-bridge and the lower half-bridge of the seventh-phase bridge arm 7, and the third end of the eighth-phase bridge arm 8 is the connection point between the upper half-bridge and the lower half-bridge of the eighth-phase bridge arm 8. Specifically, as Figure 5 shown, the seventh-phase bridge arm 7 includes two switching tubes, and the third end of the seventh-phase bridge arm 7 is the connection point of the two switching tubes; the eighth-phase bridge arm 8 includes two switching tubes, and the third end of the eighth-phase bridge arm 8 is the connection point of the two switching tubes. Each switching tube is connected in parallel with a diode that can realize functions such as freewheeling and preventing reverse voltage breakdown.

[0127] The upper and lower half-bridges of the seventh-phase bridge arm 7 and the eighth-phase bridge arm 8 are not conducting simultaneously. When the upper half-bridge of the seventh-phase bridge arm 7 is conducting, the lower half-bridge of the eighth-phase bridge arm 8 is conducting; when the lower half-bridge of the seventh-phase bridge arm 7 is conducting, the upper half-bridge of the eighth-phase bridge arm 8 is conducting. Exemplarily, when the upper half-bridge of the seventh-phase bridge arm 7 is conducting, the current flow direction is from the third end of the seventh-phase bridge arm 7, through the upper half-bridge of the seventh-phase bridge arm 7, to the second charge and discharge port 44, through the lower half-bridge of the eighth-phase bridge arm 8, and back to the third end of the eighth-phase bridge arm 8. When the upper half-bridge of the eighth-phase bridge arm 8 is conducting, the current flow direction is from the third end of the eighth-phase bridge arm 8, through the upper half-bridge of the eighth-phase bridge arm 8, to the second charge and discharge port 44, through the lower half-bridge of the seventh-phase bridge arm 7, and back to the third end of the seventh-phase bridge arm 7.

[0128] In one embodiment, as Figure 4As shown, the switching circuit includes a first switch K1 and a second switch K2. The first end a of the first switch K1 serves as the first end of the switching circuit, the second end b of the first switch K1 serves as the fourth end of the switching circuit, and the third end of the first switch K1 serves as the fifth end of the switching circuit. The first end c of the second switch K2 serves as the second end of the switching circuit, the second end d of the second switch K2 serves as the third end of the switching circuit, and the third end of the second switch K2 serves as the sixth end of the switching circuit.

[0129] As Figure 4 shown, the control circuit controls the first end a and the third end of the first switch K1 to conduct, and the first end c and the third end of the second switch K2 to conduct, so that the second power conversion circuit 42 draws power from the fifth end and the sixth end of the first power conversion circuit 40; As Figure 9 shown, the control circuit controls the second end b and the third end of the first switch K1 to conduct, and the second end d and the third end of the second switch K2 to conduct, so that the second power conversion circuit 42 draws power from the seventh end and the eighth end of the first power conversion circuit 40.

[0130] Wherein, the first switch K1 and the second switch K2 are single-pole double-throw switches.

[0131] Optionally, the switches in the switching circuit can also be single-pole single-throw switches, multi-pole multi-throw switches, etc., as long as the switching of the power-taking object of the second power conversion circuit 42 can be realized.

[0132] In one embodiment, as Figure 4 shown, the second power conversion circuit 42 includes a third transformer T3 and a rectifying circuit. The first end and the second end of the third transformer T3 respectively serve as the first end and the second end of the second power conversion circuit 42. The first end and the second end of the rectifying circuit are respectively coupled to the third end and the fourth end of the third transformer T3, and the third end and the fourth end of the rectifying circuit serve as the third end and the fourth end of the second power conversion circuit 42.

[0133] Exemplarily, the rectifying circuit includes: a fifth bridge arm circuit, a first inductor L1, and a ninth capacitor C9. The first end and the second end of the fifth bridge arm circuit respectively serve as the first end and the second end of the rectifying circuit, and the third end of the fifth bridge arm circuit serves as the fourth end of the rectifying circuit. One end of the first inductor L1 is coupled to the tap of the third transformer T3, and the second end of the first inductor L1 is coupled to the third end of the rectifying circuit. The first end of the ninth capacitor C9 is coupled to the third end of the rectifying circuit, and the second end of the ninth capacitor C9 is coupled to the fourth end of the rectifying circuit.

[0134] Wherein, the first inductor L1 and the ninth capacitor C9 are used to smooth the output voltage, suppress noise, etc., and the tap of the third transformer T3 is grounded, which is used to divide the alternating current output by the third transformer T3 into two half-waves with opposite phases.

[0135] Specifically, as Figure 4 shown, the fifth bridge arm circuit includes a ninth switching transistor Q9 and a tenth switching transistor Q10. The third terminal of the fifth bridge arm circuit is the connection point of the ninth switching transistor Q9 and the tenth switching transistor Q10. A diode for rectification is provided on each switching transistor.

[0136] The ninth switching transistor Q9 and the tenth switching transistor Q10 are not turned on simultaneously. Exemplarily, when the ninth switching transistor Q9 is turned on, the current direction is from the first terminal of the rectification circuit, through the ninth switching transistor Q9, the charging port 45, the first inductor L1, to the tap. When the tenth switching transistor Q10 is turned on, the current direction is from the second terminal of the rectification circuit, through the tenth switching transistor Q10, the charging port 45, the first inductor L1, to the tap.

[0137] In one embodiment, the first power conversion circuit 40 further includes: an AC-DC conversion circuit 40c. The first terminal and the second terminal of the AC-DC conversion circuit 40c serve as the first terminal and the second terminal of the first power conversion circuit 40. The third terminal and the fourth terminal of the AC-DC conversion circuit 40c are respectively coupled to the first terminal and the second terminal of the first current conversion circuit 40a, and the third terminal and the fourth terminal of the AC-DC conversion circuit 40c are also respectively coupled to the first terminal and the second terminal of the second current conversion circuit 40b.

[0138] Among them, the AC-DC conversion circuit 40c is used to convert the alternating current at the first charge and discharge port 43 into direct current when the first charge and discharge port 43 is connected to alternating current.

[0139] Optionally, the AC-DC conversion circuit 40c includes a switching rectification circuit, a diode rectification circuit, a thyristor rectification circuit, etc.

[0140] In one embodiment, as Figure 10 shown, the first power conversion circuit 40 includes two AC-DC conversion circuits: a first AC-DC conversion circuit 40d and a second AC-DC conversion circuit 40e. The first terminal and the second terminal of the first AC-DC conversion circuit 40d are respectively coupled to the first terminal and the second terminal of the first power conversion circuit 40. The third terminal and the fourth terminal of the first AC-DC conversion circuit 40d are respectively coupled to the first terminal and the second terminal of the first current conversion circuit 40a. The first terminal and the second terminal of the second AC-DC conversion circuit 40e are respectively coupled to the first terminal and the second terminal of the first power conversion circuit 40. The third terminal and the fourth terminal of the second AC-DC conversion circuit 40e are respectively coupled to the first terminal and the second terminal of the second current conversion circuit 40b.

[0141] In one embodiment, the AC-DC conversion circuit 40c is a power factor correction circuit.

[0142] Exemplarily, as Figure 4As shown, the power factor correction circuit includes a ninth phase leg 9, a second inductor L2, a tenth phase leg 10, and a tenth capacitor C10. The first end and the second end of the ninth phase leg 9 serve as the third end and the fourth end of the power factor correction circuit respectively. The first end of the second inductor L2 serves as the first end of the power factor correction circuit, and the second end of the second inductor L2 is coupled to the third end of the ninth phase leg 9. The first end and the second end of the tenth phase leg 10 serve as the third end and the fourth end of the power factor correction circuit respectively, and the third end of the tenth phase leg 10 serves as the second end of the power factor correction circuit. The first end and the second end of the tenth capacitor C10 are coupled to the third end and the fourth end of the power factor correction circuit respectively.

[0143] Wherein, the third end of the ninth phase leg 9 is the connection point between the upper half bridge and the lower half bridge of the ninth phase leg 9, and the third end of the tenth phase leg 10 is the connection point between the upper half bridge and the lower half bridge of the tenth phase leg 10. Specifically, as Figure 4 shown, the ninth phase leg 9 includes two switching tubes, and the third end of the ninth phase leg 9 is the connection point of the two switching tubes; the tenth phase leg 10 includes two switching tubes, and the third end of the tenth phase leg 10 is the connection point of the two switching tubes. Each switching tube is connected in parallel with a diode that can realize functions such as freewheeling and preventing reverse voltage breakdown. The second inductor L2 and the tenth capacitor C10 realize functions such as smoothing current and filtering.

[0144] In some embodiments, when the first charge-discharge port 43 supplies power to the second charge-discharge port 44, that is, when the second charge-discharge port 44 draws power from the first power conversion circuit 40; or when the second charge-discharge port 44 supplies power to the first charge-discharge port 43, that is, when the first charge-discharge port 43 draws power from the first power conversion circuit 40, the control circuit controls the voltage magnitude output by the first power conversion circuit to the first charge-discharge port or the second charge-discharge port by adjusting the duty cycle of the first power conversion circuit.

[0145] Wherein, the duty cycle of the first power conversion circuit 40 refers to the duty cycle of the drive signal that drives the switching device in the first power conversion circuit 40 to conduct and turn off. Exemplarily, the control circuit outputs a pulse width modulation (PWM) signal to control the conduction and turn-off of the switching device. A high level indicates that the switching device is conducting, and a low level indicates that the switching device is turned off. Then the duty cycle specifically refers to the percentage of the high-level time in the entire PWM cycle.

[0146] Exemplarily, the control circuit controls the upper half bridge of the first bridge arm circuit and the upper half bridge of the second bridge arm circuit to conduct in the first time period, and the lower half bridge of the first bridge arm circuit and the lower half bridge of the second bridge arm circuit to conduct in the second time period. By adjusting the durations of the first time period and the second time period, the voltage magnitude output by the first power conversion circuit to the first charge-discharge port or the second charge-discharge port can be controlled.

[0147] Exemplarily, when the second charge and discharge port 44 draws power from the first power conversion circuit 40, the formula for the output voltage of the first current conversion circuit 40a is expressed as:

[0148]

[0149] where V represents the output voltage of the first current conversion circuit 40a, D p represents the duty cycle of the switching device in the first primary circuit, D s represents the duty cycle of the switching device in the first secondary circuit, represents the turns ratio of the first transformer T1, V in represents the input voltage of the first current conversion circuit 40a.

[0150] For example, as Figure 6 shown, the first switching transistor Q1 and the third switching transistor Q3 are turned on in the first time period and turned off in the second time period; the second switching transistor Q2 and the fourth switching transistor Q4 are turned on in the second time period and turned off in the first time period. The sum of the first time period and the second time period is a complete PWM cycle. When the durations of the first time period and the second time period are the same, the duty cycles of both the first primary circuit and the first secondary circuit are 50%. Figure 6 is a schematic diagram of the control timing when the second charge and discharge port 44 draws power from the first power conversion circuit 40. As Figure 7 shown, is a schematic diagram of the control timing when the first charge and discharge port 43 draws power from the first power conversion circuit 40. From Figure 6 and Figure 7 it can be seen that when the second charge and discharge port 44 draws power from the first power conversion circuit 40 and the first charge and discharge port 43 draws power from the first power conversion circuit 40, they can be controlled through the same control timing to achieve power transmission.

[0151] In some embodiments, when the second power conversion circuit 42 draws power from the fifth and sixth terminals of the first power conversion circuit 40 and the second charge and discharge port 44 draws power from the first power conversion circuit 40, or when the second power conversion circuit 42 draws power from the seventh and eighth terminals of the first power conversion circuit 40 and the first charge and discharge port 43 draws power from the first power conversion circuit 40. By adjusting the duty cycle of the first power conversion circuit 40, the magnitude of the voltage output by the first power conversion circuit 40 to the first charge and discharge port 43 or the second charge and discharge port is adjusted. At the same time, by adjusting the phase difference between the first current conversion circuit 40a and the second current conversion circuit 40b, the magnitude of the voltage output by the first power conversion circuit 40 to the second power conversion circuit 42 is controlled.

[0152] Among them, the phase difference between the first current conversion circuit 40a and the second current conversion circuit 40b refers to the phase difference of the driving signals that drive the switching devices in the first current conversion circuit 40a and the second current conversion circuit 40b to conduct and turn off.

[0153] Exemplarily, the control circuit controls the upper half-bridge of the first arm circuit and the upper half-bridge of the second arm circuit to conduct in the first time period, and the lower half-bridge of the first arm circuit and the lower half-bridge of the second arm circuit to conduct in the second time period. The upper half-bridge of the third arm circuit and the upper half-bridge of the fourth arm circuit conduct in the third time period, and the lower half-bridge of the third arm circuit and the lower half-bridge of the fourth arm circuit conduct in the fourth time period. By adjusting the offset of the first time period and the third time period, or by adjusting the offset of the second time period and the fourth time period, the magnitude of the voltage output from the first power conversion circuit to the second power conversion circuit is controlled.

[0154] Among them, the sum of the first time period and the second time period is a complete conduction and turn-off cycle, and the sum of the third time period and the fourth time period is a complete conduction and turn-off cycle.

[0155] For example, as Figure 6 shown, the first switch tube Q1 and the third switch tube Q3 conduct in the first time period and turn off in the second time period; the second switch tube Q2 and the fourth switch tube Q4 conduct in the second time period and turn off in the first time period. The fifth switch tube Q5 and the seventh switch tube Q7 conduct in the third time period and turn off in the fourth time period; the sixth switch tube Q6 and the eighth switch tube Q8 conduct in the fourth time period and turn off in the third time period. The offset between the first time period and the third time period, or the offset between the second time period and the fourth time period is the phase difference.

[0156] Exemplarily, when the second power conversion circuit 42 draws power from the fifth terminal and the sixth terminal of the first power conversion circuit 40, if there is no offset between the first time period and the third time period, that is, the phase difference is 0, then the voltages output by the first current conversion circuit 40a and the second current conversion circuit 40b to the first terminal and the second terminal of the third transformer T3 are the same, and there is no energy transfer at this time. Only when the phase difference is not 0, a voltage difference will be formed between the first terminal and the second terminal of the third transformer T3. Therefore, the effective duty cycle of the square wave voltage output to the third transformer T3 is proportional to the phase difference.

[0157] For example, as Figure 6 shown, when there is an offset between the first time period and the third time period the third transformer T3 transfers electrical energy to the rectifier circuit. If the first switch tube Q1 and the sixth switch tube Q6 are conducting at this time, and the second switch tube Q2 and the fifth switch tube Q5 are turned off, During this period, the tenth switching transistor Q10 is in the conducting state, delivering current to the charging port 45. If at this time the first switching transistor Q1 and the sixth switching transistor Q6 are turned off, and the second switching transistor Q2 and the fifth switching transistor Q5 are conducting, During this period, the ninth switching transistor Q9 is in the conducting state, delivering current to the charging port 45.

[0158] Exemplarily, the duty cycles of the first primary circuit and the second primary circuit are fixed at 50%, and the magnitude of the voltage output to the second power conversion circuit 42 is adjusted by adjusting the phase difference.

[0159] In some embodiments, the second power conversion circuit 42 draws power from the seventh terminal and the eighth terminal of the first power conversion circuit 40, and the first charge and discharge port 43 does not draw power from the first power conversion circuit 40. By adjusting the duty cycle or the phase difference of the first current conversion circuit 40a and the second current conversion circuit 40b, the magnitude of the voltage output by the first power conversion circuit 40 to the second power conversion circuit 42 is controlled.

[0160] Exemplarily, as Figure 8 shown, the fourth switching transistor Q4 and the seventh switching transistor Q7 are conducting in the fifth time period and are turned off in the sixth time period; the third switching transistor Q3 and the eighth switching transistor Q8 are conducting in the sixth time period and are turned off in the fifth time period. By adjusting the durations of the fifth time period and the sixth time period, that is, by adjusting the duty cycle, the magnitude of the voltage output by the first power conversion circuit 40 to the second power conversion circuit 42 can be controlled. Specifically, in the fifth time period, the current flow direction is the second charge and discharge port 44, the seventh switching transistor Q7, the first end of the third transformer T3, the second end of the third transformer T3, the fourth switching transistor Q4, the second charge and discharge port 44. In the sixth time period, the current flow direction is the second charge and discharge port 44, the third switching transistor Q3, the second end of the third transformer T3, the first end of the third transformer T3, the eighth switching transistor Q8, the second charge and discharge port 44. During the fifth time period, the tenth switching transistor Q10 is in the conducting state, delivering current to the charging port 45; during the sixth time period, the ninth switching transistor Q9 is in the conducting state, delivering current to the charging port 45.

[0161] The embodiment of the present application further provides a charging method, and the method is applied to the charging device under the above-described embodiment. Exemplarily, as Figure 11 shown, the circuit charging method provided by the embodiment of the present application includes:

[0162] Step S1101: Obtain the charging mode.

[0163] Optionally, the charging mode includes, but is not limited to, powering the energy storage device through the first charge and discharge port, powering the energy storage device through the second charge and discharge port, the first charge and discharge port simultaneously powering the second charge and discharge port and the energy storage device, the second charge and discharge port simultaneously powering the first charge and discharge port and the energy storage device, etc.

[0164] Step S1102: Based on the charging mode, control different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit and outputs it through the charging port, or so that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and outputs it through the charging port.

[0165] Exemplarily, in response to determining that the first charge and discharge port powers the energy storage device, control different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit and outputs it through the charging port. In response to determining that the second charge and discharge port powers the energy storage device, control different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit and outputs it through the charging port.

[0166] In some embodiments, in response to determining that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit, the first charge and discharge port does not draw power from the first power conversion circuit, and adjust the duty cycle or phase difference of the first current conversion circuit and the second current conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit.

[0167] Wherein, the duty cycle refers to the duty cycle of the driving signal for driving the switching device in the first power conversion circuit to conduct and turn off. The phase difference refers to the phase difference of the driving signals for driving the switching devices in the first current conversion circuit and the second current conversion circuit to conduct and turn off.

[0168] In some embodiments, in response to determining that the first charge and discharge port powers the second charge and discharge port, or the second charge and discharge port powers the first charge and discharge port, adjust the duty cycle of the first power conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the first charge and discharge port or the second charge and discharge port.

[0169] In some embodiments, in response to determining that the first charge and discharge port powers the second charge and discharge port, the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit, or in response to determining that the second charge and discharge port powers the first charge and discharge port, the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit, and adjust the phase difference between the first current conversion circuit and the second current conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit.

[0170] Exemplarily, as Figure 12 shown, when the charging method of the embodiment of the present application is specifically applied to charging the power battery and the storage battery of a vehicle, the following steps may be included:

[0171] S1201: Start.

[0172] S1202: Determine whether it is in the AC charging mode. If it is in the AC charging mode, execute step S1203; if it is not in the AC charging mode, execute step S1205.

[0173] Among them, the AC charging mode means that the power battery connected to the second charging and discharging port of the charging device and the storage battery connected to the charging port are charged through the AC power grid connected to the first charging and discharging port of the charging device.

[0174] S1203: The second power conversion circuit takes power from the fifth end and the sixth end of the first power conversion circuit.

[0175] S1204: Charge the power battery and the storage battery simultaneously.

[0176] S1205: The second power conversion circuit takes power from the seventh end and the eighth end of the first power conversion circuit.

[0177] S1206: Determine whether to start the inverter discharge. If it is started, execute step S1207; if it is not started, execute step S1208.

[0178] Among them, the inverter discharge means that the power battery discharges through inversion to the first charging and discharging port of the charging device.

[0179] S1207: The power battery charges the storage battery while performing AC inverter discharge work.

[0180] S1208: The power battery charges the storage battery.

[0181] In the description of the embodiments of the present application, the specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0182] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A charging device, characterized in that, Comprising: A first power conversion circuit, wherein a first end and a second end of the first power conversion circuit serve as a first charge and discharge port, and a third end and a fourth end of the first power conversion circuit serve as a second charge and discharge port; A switch circuit, wherein a first end and a second end of the switch circuit are respectively coupled to a fifth end and a sixth end of the first power conversion circuit, and a third end and a fourth end of the switch circuit are respectively coupled to a seventh end and an eighth end of the first power conversion circuit; A second power conversion circuit, wherein a first end and a second end of the second power conversion circuit are respectively coupled to a fifth end and a sixth end of the switch circuit; a third end and a fourth end of the second power conversion circuit serve as a charging port for coupling to an energy storage device; A control circuit configured to: by controlling different conduction paths of the switch circuit, enable the second power conversion circuit to draw power from the fifth end and the sixth end of the first power conversion circuit and output through the charging port, or enable the second power conversion circuit to draw power from the seventh end and the eighth end of the first power conversion circuit and output through the charging port.

2. The charging device according to claim 1, wherein The first power conversion circuit includes: A first current conversion circuit, wherein a first end and a second end of the first current conversion circuit are coupled to the first charge and discharge port, and a third end and a fourth end of the first current conversion circuit are respectively coupled to the third end and the fourth end of the first power conversion circuit; a fifth end and a sixth end of the first current conversion circuit are respectively coupled to the fifth end and the seventh end of the first power conversion circuit; A second current conversion circuit, wherein a first end and a second end of the second current conversion circuit are coupled to the first charge and discharge port, and a third end and a fourth end of the second current conversion circuit are respectively coupled to the third end and the fourth end of the first power conversion circuit; a fifth end and a sixth end of the second current conversion circuit are respectively coupled to the sixth end and the eighth end of the first power conversion circuit; The control circuit is specifically configured to: by controlling different conduction paths of the switch circuit, enable the second power conversion circuit to draw power from the fifth end of the first current conversion circuit and the fifth end of the second current conversion circuit and output through the charging port, or enable the second power conversion circuit to draw power from the sixth end of the first current conversion circuit and the sixth end of the second current conversion circuit and output through the charging port.

3. The charging device according to claim 2, wherein The first current conversion circuit includes: A first primary side circuit, wherein a first end and a second end of the first primary side circuit respectively serve as the first end and the second end of the first current conversion circuit; a third end of the first primary side circuit serves as the fifth end of the first current conversion circuit; A first transformer, wherein a first end and a second end of the first transformer are coupled to the third end and the fourth end of the first primary side circuit; The first secondary-side circuit, the first end and the second end of the first secondary-side circuit are respectively coupled to the third end and the fourth end of the first transformer, the third end and the fourth end of the first secondary-side circuit are respectively used as the third end and the fourth end of the first current conversion circuit; the first end of the first secondary-side circuit is used as the sixth end of the first current conversion circuit.

4. The charging device according to claim 3, characterized in that, The second current conversion circuit includes: A second primary-side circuit, the first end and the second end of the second primary-side circuit are respectively used as the first end and the second end of the second current conversion circuit; the third end of the second primary-side circuit is used as the fifth end of the second current conversion circuit; A second transformer, the first end and the second end of the second transformer are coupled to the third end and the fourth end of the second primary-side circuit; A second secondary-side circuit, the first end and the second end of the second secondary-side circuit are respectively coupled to the third end and the fourth end of the second transformer, the third end and the fourth end of the second secondary-side circuit are respectively used as the third end and the fourth end of the second current conversion circuit; the first end of the second primary-side circuit is used as the sixth end of the second current conversion circuit.

5. The charging device according to claim 4, wherein, The first primary-side circuit, the second primary-side circuit, the first secondary-side circuit and the second secondary-side circuit are half-bridge circuits.

6. The charging device according to claim 5, wherein The first primary-side circuit includes: A first bridge arm circuit, the first end and the second end of the first bridge arm circuit are respectively used as the first end and the second end of the first primary-side circuit; the third end of the first bridge arm circuit is used as the third end of the first primary-side circuit; A first capacitor, the first end of the first capacitor is coupled to the first end of the first bridge arm circuit; A second capacitor, the first end of the second capacitor is coupled to the second end of the first capacitor, the second end of the second capacitor is coupled to the second end of the first bridge arm circuit, and the common connection end of the first capacitor and the second capacitor is used as the fourth end of the first primary-side circuit.

7. The charging device according to claim 6, characterized in that, The first secondary-side circuit includes: A second bridge arm circuit, the first end and the second end of the second bridge arm circuit are respectively used as the third end and the fourth end of the first secondary-side circuit; the third end of the second bridge arm circuit is used as the first end of the first secondary-side circuit; A third capacitor, the first end of the third capacitor is coupled to the first end of the second bridge arm circuit; A fourth capacitor, the first end of the fourth capacitor is coupled to the second end of the third capacitor, the second end of the fourth capacitor is coupled to the second end of the second bridge arm circuit, and the common connection end of the third capacitor and the fourth capacitor is used as the second end of the first secondary-side circuit.

8. The charging device according to claim 7, wherein The second primary-side circuit includes: A third bridge arm circuit, the first end and the second end of the third bridge arm circuit are respectively used as the first end and the second end of the second primary-side circuit; the third end of the third bridge arm circuit is used as the third end of the second primary-side circuit; A fifth capacitor, the first end of the fifth capacitor is coupled to the first end of the third bridge arm circuit; A sixth capacitor, a first end of the sixth capacitor is coupled to a second end of the fifth capacitor, a second end of the sixth capacitor is coupled to a second end of the third bridge arm circuit, and a common connection end of the fifth capacitor and the sixth capacitor serves as a fourth end of the second primary side circuit.

9. The charging device according to claim 8, wherein The second secondary side circuit includes: A fourth bridge arm circuit, a first end and a second end of the fourth bridge arm circuit respectively serve as a third end and a fourth end of the second secondary side circuit; a third end of the fourth bridge arm circuit serves as a first end of the second secondary side circuit; A seventh capacitor, a first end of the seventh capacitor is coupled to a first end of the fourth bridge arm circuit; An eighth capacitor, a first end of the eighth capacitor is coupled to a second end of the seventh capacitor, a second end of the eighth capacitor is coupled to a second end of the fourth bridge arm circuit, and a common connection end of the seventh capacitor and the eighth capacitor serves as a second end of the second secondary side circuit.

10. The charging device according to claim 4, characterized in that, The first primary side circuit, the second primary side circuit, the first secondary side circuit, and the second secondary side circuit are full-bridge circuits.

11. The charging device according to claim 10, characterized in that, The first primary side circuit includes: A first-phase bridge arm, a first end and a second end of the first-phase bridge arm respectively serve as a first end and a second end of the first primary side circuit; a third end of the first-phase bridge arm serves as a third end of the first primary side circuit; A second-phase bridge arm, a first end and a second end of the second-phase bridge arm are respectively coupled to the first end and the second end of the first-phase bridge arm, and a third end of the second-phase bridge arm serves as a fourth end of the first primary side circuit.

12. The charging device according to claim 10, wherein The first secondary side circuit includes: A third-phase bridge arm, a first end and a second end of the third-phase bridge arm respectively serve as a third end and a fourth end of the first secondary side circuit; a third end of the third-phase bridge arm serves as a first end of the first secondary side circuit; A fourth-phase bridge arm, a first end and a second end of the fourth-phase bridge arm are respectively coupled to the first end and the second end of the third-phase bridge arm, and a third end of the fourth-phase bridge arm serves as a second end of the first secondary side circuit.

13. The charging device according to claim 10, wherein, The second primary side circuit includes: A fifth-phase bridge arm, a first end and a second end of the fifth-phase bridge arm respectively serve as a first end and a second end of the second primary side circuit; a third end of the fifth-phase bridge arm serves as a third end of the second primary side circuit; A sixth-phase bridge arm, a first end and a second end of the sixth-phase bridge arm are respectively coupled to the first end and the second end of the fifth-phase bridge arm, and a third end of the sixth-phase bridge arm serves as a fourth end of the second primary side circuit.

14. The charging device according to claim 10, characterized in that, The second secondary side circuit includes: A seventh-phase bridge arm, a first end and a second end of the seventh-phase bridge arm respectively serve as a third end and a fourth end of the second secondary side circuit; a third end of the seventh-phase bridge arm serves as a first end of the second secondary side circuit; An eighth-phase bridge arm, a first end and a second end of the eighth-phase bridge arm are respectively coupled to the first end and the second end of the seventh-phase bridge arm, and a third end of the eighth-phase bridge arm serves as a second end of the second secondary side circuit.

15. The charging device according to claim 1, characterized in that The switching circuit includes: A first switch, a first end of the first switch serving as a first end of the switch circuit, a second end of the first switch serving as a fourth end of the switch circuit, and a third end of the first switch serving as a fifth end of the switch circuit; A second switch, a first end of the second switch serving as a second end of the switch circuit, a second end of the second switch serving as a third end of the switch circuit, and a third end of the second switch serving as a sixth end of the switch circuit; The control circuit is specifically configured to: make the second power conversion circuit draw power from a fifth end and a sixth end of the first power conversion circuit by controlling the first end and the third end of the first switch to conduct and the first end and the third end of the second switch to conduct; make the second power conversion circuit draw power from a seventh end and an eighth end of the first power conversion circuit by controlling the second end and the third end of the first switch to conduct and the second end and the third end of the second switch to conduct.

16. The charging device according to claim 1, characterized in that, The second power conversion circuit includes: A third transformer, a first end and a second end of the third transformer serving as a first end and a second end of the second power conversion circuit respectively; A rectifier circuit, a first end and a second end of the rectifier circuit being coupled to a third end and a fourth end of the third transformer respectively; a third end and a fourth end of the rectifier circuit serving as a third end and a fourth end of the second power conversion circuit.

17. The charging device according to claim 16, wherein The rectifier circuit includes: A fifth bridge arm circuit, a first end and a second end of the fifth bridge arm circuit serving as a first end and a second end of the rectifier circuit respectively; a third end of the fifth bridge arm circuit serving as a fourth end of the rectifier circuit; A first inductor, one end of the first inductor being coupled to a tap of the third transformer, and a second end of the first inductor being coupled to a third end of the rectifier circuit; A ninth capacitor, a first end of the ninth capacitor being coupled to a third end of the rectifier circuit, and a second end of the ninth capacitor being coupled to a fourth end of the rectifier circuit.

18. The charging device according to claim 1, wherein the control circuit is further configured to: in response to determining that the second charge and discharge port draws power from the first power conversion circuit, or the first charge and discharge port draws power from the first power conversion circuit, control the magnitude of the voltage output by the first power conversion circuit to the first charge and discharge port or the second charge and discharge port by adjusting the duty cycle of the first power conversion circuit.

19. The charging device according to claim 7, wherein the control circuit is further configured to: control the upper half bridge of the first bridge arm circuit and the upper half bridge of the second bridge arm circuit to conduct in a first time period, and control the lower half bridge of the first bridge arm circuit and the lower half bridge of the second bridge arm circuit to conduct in a second time period; control the magnitude of the voltage output by the first power conversion circuit to the first charge and discharge port or the second charge and discharge port by adjusting the duration of the first time period and the second time period.

20. The charging device according to claim 2, wherein The control circuit is further configured to: in response to determining that the second power conversion circuit draws power from the fifth terminal and the sixth terminal of the first power conversion circuit, and the second charge and discharge port draws power from the first power conversion circuit, or in response to determining that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit, and the first charge and discharge port draws power from the first power conversion circuit, control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit by adjusting the phase difference between the first current conversion circuit and the second current conversion circuit.

21. The charging device according to claim 9, wherein the control circuit is further configured to: control the upper half-bridges of the first bridge arm circuit and the second bridge arm circuit to conduct in a first time period, and the lower half-bridges of the first bridge arm circuit and the second bridge arm circuit to conduct in a second time period; control the upper half-bridges of the third bridge arm circuit and the fourth bridge arm circuit to conduct in a third time period, and the lower half-bridges of the third bridge arm circuit and the fourth bridge arm circuit to conduct in a fourth time period; control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit by adjusting the offset between the first time period and the third time period, or adjusting the offset between the second time period and the fourth time period.

22. The charging device according to claim 2, wherein the control circuit is further configured to: in response to determining that the second power conversion circuit draws power from the seventh terminal and the eighth terminal of the first power conversion circuit, and the first charge and discharge port does not draw power from the first power conversion circuit, control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit by adjusting the duty cycle or phase difference between the first current conversion circuit and the second current conversion circuit.

23. The charging device according to claim 2, wherein The first power conversion circuit further includes: an AC-DC conversion circuit, wherein the first terminal and the second terminal of the AC-DC conversion circuit serve as the first terminal and the second terminal of the first power conversion circuit, and the third terminal and the fourth terminal of the AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first current conversion circuit, and the third terminal and the fourth terminal of the AC-DC conversion circuit are also respectively coupled to the first terminal and the second terminal of the second current conversion circuit.

24. The charging device according to claim 2, characterized in that, The first power conversion circuit further includes: a first AC-DC conversion circuit, wherein the first terminal and the second terminal of the first AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first power conversion circuit, and the third terminal and the fourth terminal of the first AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first current conversion circuit; a second AC-DC conversion circuit, wherein the first terminal and the second terminal of the second AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the first power conversion circuit, and the third terminal and the fourth terminal of the second AC-DC conversion circuit are respectively coupled to the first terminal and the second terminal of the second current conversion circuit.

25. The charging device according to claim 23, characterized in that, The AC-DC conversion circuit is a power factor correction circuit.

26. The charging device according to claim 25, characterized in that, The power factor correction circuit includes: A ninth phase bridge arm, with the first end and the second end of the ninth phase bridge arm serving as the third end and the fourth end of the power factor correction circuit respectively; A second inductor, with the first end of the second inductor serving as the first end of the power factor correction circuit, and the second end of the second inductor being coupled to the third end of the ninth phase bridge arm; A tenth phase bridge arm, with the first end and the second end of the tenth phase bridge arm serving as the third end and the fourth end of the power factor correction circuit respectively; the third end of the tenth phase bridge arm serves as the second end of the power factor correction circuit; A tenth capacitor, with the first end and the second end of the tenth capacitor being coupled to the third end and the fourth end of the power factor correction circuit respectively.

27. A charging method, characterized in that, Applied to the charging device as described in Claim 1, the charging method includes: Obtaining a charging mode; Based on the charging mode, controlling different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth end and the sixth end of the first power conversion circuit and outputs it through the charging port, or so that the second power conversion circuit draws power from the seventh end and the eighth end of the first power conversion circuit and outputs it through the charging port.

28. The charging method according to claim 27, wherein The step of based on the charging mode, controlling different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth end and the sixth end of the first power conversion circuit and outputs it through the charging port, or so that the second power conversion circuit draws power from the seventh end and the eighth end of the first power conversion circuit and outputs it through the charging port, includes: In response to determining that the first charge and discharge port supplies power to the energy storage device, controlling different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the fifth end and the sixth end of the first power conversion circuit and outputs it through the charging port; In response to determining that the second charge and discharge port supplies power to the energy storage device, controlling different conduction paths of the switch circuit, so that the second power conversion circuit draws power from the seventh end and the eighth end of the first power conversion circuit and outputs it through the charging port.

29. The charging method according to claim 27, wherein Applied to the charging device as described in Claim 2, the charging method further includes: In response to determining that the second power conversion circuit draws power from the seventh end and the eighth end of the first power conversion circuit and the first charge and discharge port does not draw power from the first power conversion circuit, adjusting the duty cycle or phase difference of the first current conversion circuit and the second current conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit.

30. The charging method according to claim 29, wherein The charging method further includes: In response to determining that the first charge and discharge port supplies power to the second charge and discharge port and the second power conversion circuit draws power from the fifth end and the sixth end of the first power conversion circuit, or in response to determining that the second charge and discharge port supplies power to the first charge and discharge port and the second power conversion circuit draws power from the seventh end and the eighth end of the first power conversion circuit, adjusting the phase difference between the first current conversion circuit and the second current conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the second power conversion circuit.

31. The charging method according to claim 27, wherein The charging method further includes: In response to determining that the first charge-discharge port supplies power to the second charge-discharge port, or the second charge-discharge port supplies power to the first charge-discharge port, adjusting the duty cycle of the first power conversion circuit to control the magnitude of the voltage output by the first power conversion circuit to the first charge-discharge port or the second charge-discharge port.

32. A battery system, characterized in that, The battery system includes an AC power grid, a battery, an energy storage device, and a charging device according to any one of claims 1-26. The AC power grid is coupled to the first charge-discharge port, the battery is coupled to the second charge-discharge port, and the energy storage device is coupled to the charging port; or the battery system is charged by using the charging method according to any one of claims 27-31.

33. An energy storage device, characterized in that, It includes a charging device according to any one of claims 1-26, or includes a battery system according to claim 32; or is charged by using the charging method according to any one of claims 27-31.

34. A vehicle, characterized in that, It includes a vehicle body and a charging device according to any one of claims 1-26, or includes a vehicle body and a battery system according to claim 32; or includes a vehicle body and an energy storage device according to claim 33, or is charged by using the charging method according to any one of claims 27-31.

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