Charging and discharging system, and vehicle

Abstract

A charging and discharging system, and a vehicle. The charging and discharging system (1000) comprises a first charging circuit (10) and a first discharging circuit (30), wherein the first charging circuit (10) is connected between a power generation device (200) of the charging and discharging system (1000) and a first battery (100); the first discharging circuit (30) is connected between a load device (300) and the power generation device (200); and the first discharging circuit (30) is configured to output electric energy of the load device (300) to the power generation device (200).

Description

Charging and discharging system and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202410650513.0, filed on May 23, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of charging and discharging control, and in particular to a charging and discharging system and a vehicle. BACKGROUND

[0003] With the rapid development of battery charging and discharging technology, the battery can supply power to the load device, and the power generation device can charge the battery. Battery charging and discharging technology is a key part of battery management and use, and mainly involves how to effectively charge and discharge the battery to improve battery performance and prolong battery life. SUMMARY

[0004] An object of embodiments of the present disclosure is to provide a charging and discharging system and a vehicle.

[0005] According to a first aspect of the present disclosure, a charging and discharging system is provided, the charging and discharging system comprising: a first charging circuit and a first discharging circuit. The first charging circuit is connected between a power generation device and a first battery of the charging and discharging system; the first discharging circuit is connected between a load device and the power generation device; and the first discharging circuit is configured to output electrical energy of the load device to the power generation device.

[0006] In some embodiments, the load device is configured with a second battery.

[0007] In some embodiments, the charging and discharging system further comprises a second discharging circuit, the second discharging circuit being connected between the load device and the first battery of the charging and discharging system.

[0008] In some embodiments, the first charging circuit comprises a transformer, and the first discharging circuit comprises a first mutual inductor; the first charging circuit and the first discharging circuit share a first conversion circuit, the first conversion circuit comprising a first bridge arm and a second bridge arm, a connection point of the first bridge arm and the second bridge arm being connected to the power generation device, a midpoint of the first bridge arm being connected to a first end of a first winding of the transformer and a first end of the first mutual inductor, respectively, and a midpoint of the second bridge arm being connected to a second end of the first winding of the transformer and a second end of the first mutual inductor, respectively.

[0009] In some embodiments, the first charging circuit further comprises a first switch, and the first discharging circuit further comprises a second switch; the first switch is arranged between the first conversion circuit and the first mutual inductor, and the second switch is arranged between the first conversion circuit and the first winding of the transformer. The charging and discharging system further comprises a control circuit, and the first switch, the second switch and the first conversion circuit are controlled by the control circuit. In the case that the power generation device fails, the control circuit is configured to control the first switch to be closed and the second switch to be opened. The control circuit is further configured to control the first conversion circuit to convert the first alternating current output by the first mutual inductor into the second direct current. The first alternating current is converted from the first direct current output by the second battery configured by the load device after the first mutual inductor and the second mutual inductor of the load device are mutually inducted.

[0010] In some embodiments, the second discharging circuit and the first discharging circuit share the first mutual inductor, the first discharging circuit further comprises a third switch, and the first charging circuit further comprises a transformer, a fourth switch and a second conversion circuit. The third switch is arranged between the second winding of the transformer and the first mutual inductor, and the fourth switch is arranged between the second winding of the transformer and the second conversion circuit. The charging and discharging system further comprises a control circuit, and the third switch, the fourth switch and the second conversion circuit are controlled by the control circuit. In the case that the power generation device fails, the control circuit is configured to control the third switch and the fourth switch to be opened.

[0011] In some embodiments, the second conversion circuit comprises a third bridge arm and a fourth bridge arm, a connection point of the third bridge arm and the fourth bridge arm is connected with the first battery, a midpoint of the third bridge arm is connected with a first end of the second winding of the transformer, and a midpoint of the fourth bridge arm is connected with a second end of the second winding of the transformer.

[0012] According to a second aspect of the present disclosure, a vehicle is further provided, which comprises a power generation device, a load device, a first battery and a charging and discharging system, and the charging and discharging system is the charging and discharging system described above.

[0013] In some embodiments, the first charging circuit of the charge-discharge system includes a first conversion circuit, a second conversion circuit, a transformer, a second switch, and a fourth switch, the first discharging circuit of the charge-discharge system includes a first mutual inductor, a first switch, and the first conversion circuit, and the second discharging circuit of the charge-discharge system includes the second conversion circuit, a third switch, and the first mutual inductor. The vehicle has at least one of a battery charging mode, a first battery discharging mode, and a first load discharging mode. In the battery charging mode, the control circuit of the charge-discharge system controls the second switch and the fourth switch to be closed, controls the first switch and the third switch to be opened, and controls the first conversion circuit and the second conversion circuit to convert third direct current output by the power generation device into fourth direct current and output the fourth direct current to the first battery, so as to charge the first battery.

[0014] In the first battery discharging mode, the control circuit of the charge-discharge system controls the third switch to be closed, controls the first switch, the second switch, and the fourth switch to be opened, and controls the second conversion circuit to convert fifth direct current output by the first battery into second alternating current and output the second alternating current to the corresponding first mutual inductor, so that the second mutual inductor of the load device and the corresponding first mutual inductor are mutually inductive, and the load device is charged.

[0015] In the first load discharging mode, the control circuit of the charge-discharge system controls the first switch to be closed, controls the second switch, the third switch, and the fourth switch to be opened, and controls the first conversion circuit to convert first alternating current output by the corresponding first mutual inductor into second direct current and output the second direct current to the power generation device.

[0016] In some embodiments, the vehicle further has a second load discharging mode. In the second load discharging mode, the control circuit of the charge-discharge system controls the third switch to be closed, controls the first switch, the second switch, and the fourth switch to be opened, and controls the second conversion circuit to convert first alternating current output by the corresponding first mutual inductor into third direct current and output the third direct current to the first battery, so as to charge the first battery.

[0017] In some embodiments, the vehicle further has a second battery discharging mode; in the second battery discharging mode, the control circuit of the charge-discharge system controls the second switch and the fourth switch to be closed, controls the first switch and the third switch to be opened, and controls the first conversion circuit and the second conversion circuit to convert fourth direct current output by the first battery into third direct current and output the third direct current to the power generation device, so as to charge the first battery.

[0018] In some embodiments, the load device comprises a second mutual inductance coil, a third conversion circuit, and a second battery, the third conversion circuit being connected between the second battery and the second mutual inductance coil.

[0019] In some embodiments, the power generation device comprises a plurality of power generation units, each power generation unit comprising a power generation element, a diode, and a resistor, a first end of the power generation element being connected to a first end of the resistor, an anode of the diode being connected to the first end of the power generation element, a cathode of the diode being connected to a second end of the power generation element, the second end of the power generation element and a second end of the resistor serving as an output end of the power generation unit.

[0020] The charge-discharge system of the embodiments of the present disclosure sets the first discharging circuit between the load device and the power generation device, in the case that the power generation device fails due to low temperature or lack of starting voltage, etc., the load device can supply power to the power generation device through the first discharging circuit, thereby widening the power supply mode of the charge-discharge system and improving the utilization rate of the load device.

[0021] Other features and advantages of the embodiments of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0023] FIG. 1 is a block diagram of a charge-discharge system according to some embodiments;

[0024] FIG. 2 is a circuit diagram of a charge-discharge system according to some embodiments;

[0025] FIG. 3 is another circuit diagram of a charge-discharge system according to some embodiments;

[0026] FIG. 4 is a circuit diagram of a power generation unit according to some embodiments;

[0027] FIG. 5 is a block diagram of a vehicle according to some embodiments.

[0028] Reference signs: charge-discharge system 1000; vehicle 2000; first battery 100; power generation device 200; power generation unit 210; load device 300; second battery 310; third conversion circuit 320 first charge circuit 10; first conversion circuit 11; second conversion circuit 12; second discharge circuit 20; first discharge circuit 30; first bridge arm 1; second bridge arm 2; third bridge arm 3; fourth bridge arm 4. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless otherwise specifically stated.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the disclosure and its applications or uses.

[0031] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and devices can be viewed as part of the specification.

[0032] In all of the examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0033] Note that like reference numerals and letters indicate like items in the accompanying drawings and, as such, once an item is defined in one drawing, that definition is applicable to all subsequent drawings incorporating similar items.

[0034] In the related art, in the case where a power generation device fails due to low temperature or lack of a start voltage, etc., the power generation device is powered by a battery alone to operate normally, which has a large limitation.

[0035] Referring to FIG. 1, a charge-discharge system 1000 according to some embodiments of the present disclosure is explained.

[0036] The charge-discharge system 1000 according to some embodiments of the present disclosure includes a first charge circuit 10 and a first discharge circuit 30.

[0037] The first charging circuit 10 is connected between the power generation device 200 and the first battery 100 of the charge-discharge system 1000. The first charging circuit 10 can have a direct current-direct current conversion function, i.e., the first charging circuit 10 can convert the third direct current output by the power generation device 200 into fourth direct current and output the fourth direct current to the first battery 100, or the first charging circuit 10 can convert the fourth direct current output by the first battery 100 into the third direct current and output the third direct current to the power generation device 200, which is not limited herein.

[0038] In some examples, the power generation device 200 can be a wind power generation device, a solar power generation device, a hydrogen power generation device, or the like, which is not limited herein.

[0039] In some examples, taking the application of the charge-discharge system 1000 in the vehicle 2000 as an example, the first battery 100 can be a power battery of the vehicle 2000.

[0040] In some examples, the first charging circuit 10 can be an isolated direct current-direct current conversion circuit or a non-isolated direct current-direct current conversion circuit, which is not limited herein.

[0041] Referring to FIG. 1, the first discharging circuit 30 is connected between the load device 300 and the power generation device 200. The first discharging circuit 30 can have a direct current-direct current conversion function, i.e., the first discharging circuit 30 can convert the first direct current output by the load device 300 into second direct current and output the second direct current to the power generation device 200, or the first discharging circuit 30 can convert the second direct current output by the power generation device 200 into the first direct current and output the first direct current to the first battery 100, which is not limited herein.

[0042] In this way, in the case that the power generation device 200 is disabled due to low temperature or lack of starting voltage, etc., the first discharging circuit 30 converts the first direct current output by the second battery 310 into second direct current and outputs the second direct current to the power generation device 200. In this case, the charge-discharge system 1000 is not limited to the first battery 100 to supply power to the power generation device 200, and the load device 300 can supply power to the power generation device 200 through the first discharging circuit 30, thereby widening the power supply mode of the charge-discharge system 1000 and improving the utilization rate of the load device 300.

[0043] In some examples, referring to FIG. 1, the load device 300 is configured with the second battery 310, so that the load device 300 has a charging and discharging function to realize that the electric energy of the load device 300 can be output to the power generation device 200.

[0044] In some examples, the load device 300 can be a drone, a moped, a motorcycle, etc., without limitation. The load device 300 is configured with a second battery 310, which can be a battery for powering the load device 300 or a battery for powering part of the load device 300, without limitation.

[0045] In some embodiments, referring to FIG. 1, the charge-discharge system 1000 further includes a second discharge circuit 20 connected between the load device 300 and the first battery 100 of the charge-discharge system 1000. The second discharge circuit 20 can have a direct-current-direct-current conversion function, i.e., the second discharge circuit 20 can convert the fifth direct current output by the first battery 100 into a sixth direct current and output the sixth direct current to the load device 300, or the second discharge circuit 20 can convert the sixth direct current output by the load device 300 into the fifth direct current and output the fifth direct current to the first battery 100, without limitation.

[0046] In some embodiments, the first charge circuit 10 can be an isolated direct-current-direct-current conversion circuit, as shown in FIGS. 1 and 2, and the first discharge circuit 30 includes a first mutual inductor L1.

[0047] As shown in FIGS. 1 and 2, the first charge circuit 10 and the first discharge circuit 30 share a first conversion circuit 11, which includes a first bridge arm 1 and a second bridge arm 2. The connection point of the first bridge arm 1 and the second bridge arm 2 is connected to the power generation device 200, and the midpoint of the first bridge arm 1 is connected to the first end of the first winding of the transformer T1 and the first end of the first mutual inductor L1, respectively. The midpoint of the second bridge arm 2 is connected to the second end of the first winding of the transformer T1 and the second end of the first mutual inductor L1, respectively.

[0048] In some examples, the first conversion circuit 11 is a direct-current-alternating-current conversion circuit, which can convert the first alternating current output by the first mutual inductor L1 into a second direct current and output the second direct current to the power generation device 200, or convert the second direct current output by the power generation device 200 into the first alternating current and output the first alternating current to the first mutual inductor L1, without limitation.

[0049] In some examples, as shown in FIGS. 1 and 2, the first discharge circuit 30 further includes a first capacitor C1, the first end of the first capacitor C1 is connected to the first end of the first mutual inductor L1, the second end of the first capacitor C1 is connected to the midpoint of the first bridge arm 1, and the second end of the first mutual inductor L1 is connected to the midpoint of the second bridge arm 2, so that the first capacitor C1 and the first mutual inductor L1 can constitute a resonance circuit.

[0050] In this way, by multiplexing the first conversion circuit 11, the utilization efficiency of the first conversion circuit 11 can be improved, and the circuit structure of the charging and discharging system 1000 can be effectively simplified, thereby effectively saving the space occupied by the charging and discharging system 1000.

[0051] In some embodiments, as shown in FIGS. 1 and 2, the first charging circuit 10 further includes a first switch K1, and the first discharging circuit 30 further includes a second switch K2.

[0052] The first switch K1 is arranged between the first conversion circuit 11 and the first mutual inductor coil L1, and the second switch K2 is arranged between the first conversion circuit 11 and the first winding of the transformer T1.

[0053] In some examples, as shown in FIG. 2, the first switch K1 can be connected between the midpoint of the second bridge arm 2 and the second end of the first mutual inductor coil L1, and the second switch K2 can be connected between the midpoint of the second bridge arm 2 and the second end of the first winding of the transformer T1.

[0054] The charging and discharging system 1000 further includes a control circuit, and the first switch K1, the second switch K2, and the first conversion circuit 11 are controlled by the control circuit.

[0055] In some examples, the control circuit can be an electronic control unit (ECU), which can control the first switch K1 and the second switch K2 to be closed or opened. For example, the first switch K1 is a metal-oxide-semiconductor field-effect transistor (MOSFET), and the control circuit can output a corresponding control signal to the gate of the first switch K1 to make the first switch K1 closed or opened.

[0056] In some examples, the control circuit can control the first conversion circuit 11 to perform direct current-alternating current conversion. For example, as shown in FIG. 2, the first switch Q1 and the second switch Q2 are both metal-oxide-semiconductor field-effect transistors, and the control circuit can output pulse width modulation (PWM) wave signals with different duty cycles to control the two groups of switches to be alternately turned on to achieve alternating current-direct current conversion. One group of switches includes the first switch Q1 and the fourth switch Q4, and the other group of switches includes the second switch Q2 and the third switch Q3.

[0057] In the case where the power generation device 200 fails, the control circuit is configured to control the first switch K1 to be closed and the second switch K2 to be opened. The control circuit is further configured to control the first conversion circuit 11 to convert the first alternating current output by the first mutual inductor coil L1 into second direct current.

[0058] As shown in FIG. 1 and FIG. 2, the first alternating current is converted from the first direct current output by the second battery 310 after the first mutual inductance coil L1 and the second mutual inductance coil L2 of the load device 300 are mutually inducted.

[0059] As shown in FIG. 3, the load device 300 can include the second battery 310, the third conversion circuit 320, the second mutual inductance coil L2, and the second capacitor C2, two ends of the second battery 310 are connected with the input end of the third conversion circuit 320 respectively, the first end of the second capacitor C2 and the first end of the second mutual inductance coil L2 are connected, the second end of the second capacitor C2 and the second end of the second mutual inductance coil L2 are connected with the output end of the third conversion circuit 320 respectively, so that the second mutual inductance coil L2 and the second capacitor C2 form another resonance circuit. The third conversion circuit 320 can be an inverter, which can convert the first direct current output by the second battery 310 into the third alternating current, and in the case of mutual induction between the first mutual inductance coil L1 and the second mutual inductance coil L2, the first mutual inductance coil L1 can output the first alternating current.

[0060] In some examples, the first capacitor C1 and the first mutual inductance coil L1 form a series resonance respectively, and the second capacitor C2 and the second mutual inductance coil L2 form a series resonance respectively, and the values of the first capacitor C1, the first mutual inductance coil L1, the second capacitor C2 and the second mutual inductance coil L2 satisfy where f w is the set wireless charging system operating frequency. Here, only the series resonance is taken as an example, and in actual application, the connection mode of the first capacitor C1, the first mutual inductance coil L1, the second capacitor C2 and the second mutual inductance coil L2 can be various, and parallel resonance or LCC type resonance can be formed, which is not limited here.

[0061] In this way, by setting the first switch K1 and the second switch K2, the working of the first charging circuit 10 and the first discharging circuit 30 can be switched and controlled, the situation that the first charging circuit 10 consumes electric energy in the process that the load device 300 discharges the power generation device 200 is reduced, and the utilization rate of electric energy of the load device 300 is improved.

[0062] In some embodiments, as shown in FIG. 1 and FIG. 2, the second discharging circuit 20 and the first discharging circuit 30 share the first mutual inductance coil L1, the first discharging circuit 30 further includes a third switch K3, and the first charging circuit 10 further includes a transformer T1, a fourth switch K4 and a second conversion circuit 12.

[0063] The foregoing is described by taking the second discharging circuit 20 and the first discharging circuit 30 sharing the first mutual inductance coil L1 as an example, of course, in some embodiments, the second discharging circuit 20 and the first discharging circuit 30 can respectively include a first mutual inductance coil L1.

[0064] The third switch K3 is arranged between the second winding of the transformer T1 and the first mutual inductor L1, and the fourth switch K4 is arranged between the second winding of the transformer T1 and the second conversion circuit 12.

[0065] In some examples, as shown in FIG. 2, the third switch K3 is connected between the second end of the first mutual inductor L1 and the midpoint of the fourth bridge arm 4, and the fourth switch K4 is connected between the second end of the second winding of the transformer T1 and the midpoint of the fourth bridge arm 4.

[0066] In some examples, the charge-discharge system 1000 further comprises a control circuit, and the third switch K3, the fourth switch K4 and the second conversion circuit 12 are controlled by the control circuit.

[0067] In some examples, the control circuit can control the third switch K3 and the fourth switch K4 to be closed or opened, for example, the fourth switch K4 is a MOSFET, and the control circuit can output a corresponding control signal to the gate of the fourth switch K4, so that the fourth switch K4 is closed or opened.

[0068] In the case that the power generation device 200 fails, the control circuit is configured to control the third switch K3 and the fourth switch K4 to be opened.

[0069] In this way, by arranging the third switch K3 and the fourth switch K4, the consumption of electric energy by the first charging circuit 10 in the process of discharging the power generation device 200 by the load device 300 is reduced, and the utilization rate of electric energy of the load device 300 is further improved.

[0070] In some embodiments, as shown in FIG. 1 and FIG. 2, the second conversion circuit 12 comprises a third bridge arm 3 and a fourth bridge arm 4, the connection point of the third bridge arm 3 and the fourth bridge arm 4 is connected with the first battery 100, the midpoint of the third bridge arm 3 is connected with the first end of the second winding of the transformer T1, and the midpoint of the fourth bridge arm 4 is connected with the second end of the second winding of the transformer T1.

[0071] In some examples, the second conversion circuit 12 is a direct current-alternating current conversion circuit, which can convert the fourth alternating current output by the second winding of the transformer T1 into fourth direct current and output the fourth direct current to the first battery 100, or convert the fourth direct current output by the first battery 100 into fourth alternating current and output the fourth alternating current to the second winding of the transformer T1, so that the second winding of the transformer T1 can output third direct current to the power generation device 200, which is not limited herein.

[0072] In some examples, as shown in FIG. 2, the upper bridge arm of the first bridge arm 1 can be composed of a plurality of first switch tubes Q1, the lower bridge arm of the first bridge arm 1 can be composed of a plurality of second switch tubes Q2, the upper bridge arm of the second bridge arm 2 can be composed of a plurality of third switch tubes Q3, and the lower bridge arm of the second bridge arm 2 can be composed of a plurality of fourth switch tubes Q4. The first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4 can be MOSFETs, the source of the first switch tube Q1 is connected with the drain of the second switch tube Q2, the source of the third switch tube Q3 is connected with the drain of the fourth switch tube Q4, the drain of the first switch tube Q1 is connected with the drain of the third switch tube Q3, and the source of the second switch tube Q2 is connected with the source of the fourth switch tube Q4.

[0073] The upper bridge arm of the third bridge arm 3 can be composed of a plurality of fifth switch tubes Q5, the lower bridge arm of the third bridge arm 3 can be composed of a plurality of sixth switch tubes Q6, the upper bridge arm of the fourth bridge arm 4 can be composed of a plurality of seventh switch tubes Q7, and the lower bridge arm of the fourth bridge arm 4 can be composed of a plurality of eighth switch tubes Q8. The fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 can be MOSFETs, the source of the fifth switch tube Q5 is connected with the drain of the sixth switch tube Q6, the source of the seventh switch tube Q7 is connected with the drain of the eighth switch tube Q8, the drain of the fifth switch tube Q5 is connected with the drain of the seventh switch tube Q7, and the source of the sixth switch tube Q6 is connected with the source of the eighth switch tube Q8.

[0074] The first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 are controlled by a control circuit, and the control circuit can control the two groups of switch tubes to be turned on alternately to realize the conversion of direct current to direct current. One group of switch tubes is the first switch tube Q1, the fourth switch tube Q4, the fifth switch tube Q5, and the eighth switch tube Q8, and the other group of switch tubes is the second switch tube Q2, the third switch tube Q3, the sixth switch tube Q6, and the seventh switch tube Q7.

[0075] In some examples, as shown in FIG. 1 and FIG. 2, the first charging circuit 10 further includes a third inductor L3, a fourth inductor L4, and a third capacitor C3. The first end of the third inductor L3 is connected with the midpoint of the first bridge arm 1, the second end of the third inductor L3 is connected with the first end of the third capacitor C3, the connection end of the second end of the third capacitor C3 and the first end of the fourth inductor L4 is connected with the first end of the first winding of the transformer T1, and the connection point of the second end of the fourth inductor L4 and the midpoint of the second bridge arm 2 is connected with the second end of the first winding of the transformer T1.

[0076] As shown in FIG. 1 and FIG. 2, the first charging circuit 10 further comprises a fifth inductor L5 and a fifth capacitor C5, a first end of the fifth inductor L5 is connected with a first end of the second winding of the transformer T1, a second end of the fifth inductor L5 is connected with a first end of the fifth capacitor C5, a second end of the fifth capacitor C5 is connected with the midpoint of the third bridge arm 3, so that the third inductor L3, the fourth inductor L4, the third capacitor C3, the fifth inductor L5 and the fifth capacitor C5 constitute a CLLC resonant circuit.

[0077] In some examples, in the CLLC resonant circuit constituted by the third inductor L3, the fourth inductor L4, the third capacitor C3, the fifth inductor L5 and the fifth capacitor C5, the values of the third inductor L3, the fourth inductor L4, the third capacitor C3, the fifth inductor L5 and the fifth capacitor C5 need to satisfy where f s is the frequency of the set CLLC resonant circuit, which is also the working frequency of the first conversion circuit 11. The CLLC resonant circuit works at the working frequency to keep the CLLC circuit high efficiency.

[0078] In some examples, the first direct current, the second direct current, the third direct current, the fourth direct current and the fifth direct current only represent the direct currents output by different objects in the charging and discharging system 1000, and the voltage values or current values of these direct currents can be the same or different, which is not limited here.

[0079] In some examples, the first alternating current and the second alternating current only represent the alternating currents output by different objects in the charging and discharging system 1000, and the voltage values or current values of these alternating currents can be the same or different, which is not limited here.

[0080] Referring to FIG. 5, the vehicle 2000 provided by the embodiment of the present disclosure comprises a power generation device 200, a load device 300, a first battery 100 and the charging and discharging system 1000 of any of the above embodiments. In this way, the vehicle 2000 can improve the integration of the internal circuit of the vehicle 2000 when the charging and discharging system 1000 is configured, thereby reducing the cost.

[0081] In some embodiments, the first charging circuit 10 of the charging and discharging system 1000 comprises the first conversion circuit 11, the second conversion circuit 12, the transformer T1, the second switch K2 and the fourth switch K4, the first discharging circuit 30 of the charging and discharging system 1000 comprises the first mutual inductor L1, the first switch K1 and the first conversion circuit 11, and the second discharging circuit 20 of the charging and discharging system 1000 comprises the second conversion circuit 12, the third switch K3 and the first mutual inductor L1.

[0082] The vehicle 2000 has at least one of a battery charging mode, a first battery discharging mode and a first load discharging mode.

[0083] In the battery charging mode, the control circuit of the charging and discharging system 1000 controls the second switch K2 and the fourth switch K4 to be closed, controls the first switch K1 and the third switch K3 to be opened, and controls the first conversion circuit 11 and the second conversion circuit 12 to convert the third direct current output by the power generation device 200 into fourth direct current, and output the fourth direct current to the first battery 100, so as to charge the first battery 100.

[0084] In some examples, as shown in FIG. 2, in the battery charging mode, the control circuit can control two groups of switching tubes to be turned on alternately to realize the conversion of direct current to direct current. One group of switching tubes is the first switching tube Q1, the fourth switching tube Q4, the fifth switching tube Q5 and the eighth switching tube Q8, and the other group of switching tubes is the second switching tube Q2, the third switching tube Q3, the sixth switching tube Q6 and the seventh switching tube Q7.

[0085] In the first battery discharging mode, the control circuit of the charging and discharging system 1000 controls the third switch K3 to be closed, controls the first switch K1, the second switch K2 and the fourth switch K4 to be opened, and controls the second conversion circuit 12 to convert the fifth direct current output by the first battery 100 into second alternating current, and output the second alternating current to the first mutual inductor L1, so that the second mutual inductor L2 of the load device 300 is inductively coupled with the first mutual inductor L1, to charge the load device 300.

[0086] In some examples, as shown in FIG. 2, in the first battery discharging mode, the control circuit can control two groups of switching tubes to be turned on alternately to realize the conversion of direct current to alternating current, one group of switching tubes is the fifth switching tube Q5 and the eighth switching tube Q8, and the other group of switching tubes is the sixth switching tube Q6 and the seventh switching tube Q7, to convert the fifth direct current output by the first battery 100 into second alternating current.

[0087] In the first load discharging mode, the control circuit of the charging and discharging system 1000 controls the first switch K1 to be closed, controls the second switch K2, the third switch K3 and the fourth switch K4 to be opened, and controls the first conversion circuit 11 to convert the first alternating current output by the first mutual inductor L1 into second direct current, and output the second direct current to the power generation device 200.

[0088] In some examples, as shown in FIG. 2, in the first battery discharging mode, the control circuit can control two groups of switching tubes to be turned on alternately to realize the conversion of alternating current to direct current, one group of switching tubes is the first switching tube Q1 and the fourth switching tube Q4, and the other group of switching tubes is the second switching tube Q2 and the third switching tube Q3, to convert the first alternating current output by the first mutual inductor L1 into second direct current.

[0089] In this way, after the vehicle 2000 is configured with the charging and discharging system 1000, the integration of the internal circuit of the vehicle 2000 can be improved while different working modes of the vehicle 2000 are realized.

[0090] In some embodiments, the vehicle 2000 further has a second load discharging mode.

[0091] In the second load discharging mode, the control circuit of the charging and discharging system 1000 controls the third switch K3 to be closed, controls the first switch K1, the second switch K2 and the fourth switch K4 to be opened, and controls the second conversion circuit 12 to convert the first alternating current output by the first mutual inductor L1 into third direct current and output the third direct current to the first battery 100, so that the first battery 100 is charged.

[0092] In some examples, as shown in FIG. 2, in the second load discharging mode, the control circuit can control two groups of switching tubes to be alternately turned on to realize the conversion from alternating current to direct current, one group of switching tubes being the fifth switching tube Q5 and the eighth switching tube Q8, and the other group of switching tubes being the sixth switching tube Q6 and the seventh switching tube Q7, so as to convert the first alternating current output by the first mutual inductor L1 into third direct current.

[0093] In this way, after the vehicle 2000 is configured with the charging and discharging system 1000, the load device 300 can be used to charge the first battery 100, so that in some special cases, the load device 300 can supply power to the first battery 100, thereby improving the safety of the vehicle 2000.

[0094] In some examples, in the second load discharging mode, the control circuit can control part of the devices of the first battery 100 to work, so that the first battery 100 can preferentially supply power to the circuit module for alarm or help, thereby improving the utilization efficiency of the electric energy of the first battery 100.

[0095] In some embodiments, the vehicle 2000 further has a second battery 310 discharging mode.

[0096] In the second battery 310 discharging mode, the control circuit of the charging and discharging system 1000 controls the second switch K2 and the fourth switch K4 to be closed, controls the first switch K1 and the third switch K3 to be opened, and controls the first conversion circuit 11 and the second conversion circuit 12 to convert the fourth direct current output by the first battery 100 into third direct current and output the third direct current to the power generation device 200, so that the first battery 100 is charged.

[0097] In some examples, as shown in FIG. 2, in the second battery 310 discharging mode, the control circuit can control the two groups of switching tubes to be turned on alternately to realize the conversion of direct current to direct current, one group of switching tubes being the first switching tube Q1, the fourth switching tube Q4, the fifth switching tube Q5 and the eighth switching tube Q8, and the other group of switching tubes being the second switching tube Q2, the third switching tube Q3, the sixth switching tube Q6 and the seventh switching tube Q7.

[0098] In this way, after the vehicle 2000 is configured with the charging and discharging system 1000, the first battery 100 can be used to reverse charge the power generation device 200, so that the first battery 100 can also provide power to the power generation device 200 in the case of failure of the power generation device 200.

[0099] In some embodiments, as shown in FIG. 3, the load device 300 can include a second battery 310, a third conversion circuit 320 and a second mutual inductor L2, a second mutual inductor L2 and a second capacitor C2, two ends of the second battery 310 being connected with input ends of the third conversion circuit 320 respectively, a first end of the second capacitor C2 and a first end of the second mutual inductor L2 being connected, a second end of the second capacitor C2 and a second end of the second mutual inductor L2 being connected with output ends of the third conversion circuit 320 respectively, so that the second mutual inductor L2 and the second capacitor C2 constitute the other resonant circuit. The third conversion circuit 320 can be an inverter, which can convert the first direct current output by the second battery 310 into third alternating current, and in the case of mutual induction between the first mutual inductor L1 and the second mutual inductor L2, the first mutual inductor L1 can output the first alternating current.

[0100] In this way, after the vehicle 2000 is configured with the load device 300, the load device 300 can be used to discharge the power generation device 200 or the first battery 100, so as to improve the utilization efficiency of the second battery 310 of the load device 300.

[0101] In some embodiments, as shown in FIG. 4, the power generation device 200 includes a plurality of power generation units 210, which can be combined in series, in parallel or in series-parallel to form the power generation device 200, which is not limited here.

[0102] The power generation unit 210 comprises a power generation device, a diode D1 and a resistor R1, a first end of the power generation device is connected with a first end of the resistor R1, an anode of the diode D1 is connected with the first end of the power generation device, a cathode of the diode D1 is connected with a second end of the power generation device, the second end of the power generation device and a second end of the resistor R1 serve as output ends of the power generation unit. In this way, by arranging the diode D1, the input direct current can be prevented from flowing back to the power generation unit 210 when the first battery 100 or the load device 300 discharges the power generation device 200, and the input direct current can flow to the resistor R1, so that the resistor R1 generates heat, and the power generation device 200 is at a normal working temperature, so that the power generation device 200 can stably operate in different situations.

[0103] Although some specific embodiments of the present disclosure have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A charge-discharge system, comprising: a first charging circuit connected between a power generation device and a first battery of the charge-discharge system; and a first discharging circuit connected between a load device and the power generation device; the first discharging circuit is configured to output electrical energy of the load device to the power generation device. The load device is configured with a second battery.

2. The charge and discharge system according to claim 1, wherein 3. The charge-discharge system of claim 1 or 2, further comprising a second discharging circuit connected between the load device and the first battery of the charge-discharge system. The first charging circuit comprises a transformer, and the first discharging circuit comprises a first mutual inductor; 4. The charge and discharge system according to any one of claims 1 to 3, wherein The first charging circuit and the first discharging circuit multiplex a first conversion circuit, the first conversion circuit comprises a first bridge arm and a second bridge arm, a connection point of the first bridge arm and the second bridge arm is connected with the power generation device, a midpoint of the first bridge arm is connected with a first end of a first winding of the transformer and a first end of the first mutual inductor respectively, and a midpoint of the second bridge arm is connected with a second end of the first winding of the transformer and a second end of the first mutual inductor respectively. The first charging circuit further comprises a first switch, and the first discharging circuit further comprises a second switch; 5. The charge and discharge system according to claim 4, wherein The first switch is arranged between the first conversion circuit and the first mutual inductor, and the second switch is arranged between the first conversion circuit and the first winding of the transformer; The charge-discharge system further comprises a control circuit, and the first switch, the second switch and the first conversion circuit are controlled by the control circuit; In the case that the power generation device fails, the control circuit is configured to control the first switch to be closed and the second switch to be opened, and the control circuit is further configured to control the first conversion circuit to convert first alternating current output by the first mutual inductor into second direct current; wherein the first alternating current is converted from first direct current output by the second battery of the load device after the first mutual inductor and a second mutual inductor of the load device are mutually inducted.

6. The charge-discharge system of any one of claims 1 to 5, further comprising a second discharging circuit and a first mutual inductor multiplexed by the first discharging circuit, the first discharging circuit further comprises a third switch, the first charging circuit further comprises a transformer, a fourth switch and a second conversion circuit; The third switch is arranged between a second winding of the transformer and the first mutual inductor, and the fourth switch is arranged between the second winding of the transformer and the second conversion circuit; The charge-discharge system further comprises a control circuit, and the third switch, the fourth switch and the second conversion circuit are controlled by the control circuit; In the case that the power generation device fails, the control circuit is configured to control the third switch and the fourth switch to be opened. ​ 7. The charge and discharge system according to claim 6, wherein The second conversion circuit comprises a third bridge arm and a fourth bridge arm, a connection point of the third bridge arm and the fourth bridge arm is connected with the first battery, a middle point of the third bridge arm is connected with a first end of the second winding of the transformer, and a middle point of the fourth bridge arm is connected with a second end of the second winding of the transformer.

8. A vehicle comprising a power generation device, a load device, a first battery, and a charge-discharge system, wherein the charge-discharge system is the charge-discharge system according to any one of claims 1 to 7.

9. The vehicle of claim 8, wherein, The first charging circuit of the charge-discharge system comprises a first conversion circuit, a second conversion circuit, a transformer, a second switch, and a fourth switch, the first discharging circuit of the charge-discharge system comprises a first mutual inductor, a first switch, and the first conversion circuit, and the second discharging circuit of the charge-discharge system comprises the second conversion circuit, a third switch, and the first mutual inductor; The vehicle has at least one of a battery charging mode, a first battery discharging mode, and a first load discharging mode; In the battery charging mode, the control circuit of the charge-discharge system controls the second switch and the fourth switch to be closed, controls the first switch and the third switch to be opened, and controls the first conversion circuit and the second conversion circuit to convert third direct current output by the power generation device into fourth direct current and output the fourth direct current to the first battery, so as to charge the first battery; In the first battery discharging mode, the control circuit of the charge-discharge system controls the third switch to be closed, controls the first switch, the second switch, and the fourth switch to be opened, and controls the second conversion circuit to convert fifth direct current output by the first battery into second alternating current and output the second alternating current to the corresponding first mutual inductor, so that the second mutual inductor of the load device and the corresponding first mutual inductor are mutually inductive, thereby charging the load device; In the first load discharging mode, the control circuit of the charge-discharge system controls the first switch to be closed, controls the second switch, the third switch, and the fourth switch to be opened, and controls the first conversion circuit to convert first alternating current output by the corresponding first mutual inductor into second direct current and output the second direct current to the power generation device.

10. The vehicle of claim 9, wherein, The vehicle further has a second load discharging mode; In the second load discharging mode, the control circuit of the charge-discharge system controls the third switch to be closed, controls the first switch, the second switch, and the fourth switch to be opened, and controls the second conversion circuit to convert first alternating current output by the corresponding first mutual inductor into third direct current and output the third direct current to the first battery, so as to charge the first battery.

11. The vehicle of claim 9 or 10, wherein, The vehicle further has a second battery discharging mode; In the second battery discharging mode, the control circuit of the charge-discharge system controls the third switch to be closed, controls the first switch, the second switch, and the fourth switch to be opened, and controls the second conversion circuit to convert first alternating current output by the corresponding first mutual inductor into third direct current and output the third direct current to the first battery, so as to charge the first battery. In the second battery discharging mode, the control circuit of the charge-discharge system controls the second switch and the fourth switch to be closed, controls the first switch and the third switch to be opened, and controls the first conversion circuit and the second conversion circuit to convert fourth direct current output by the first battery into third direct current and output the third direct current to the power generation device, so as to charge the first battery.

12. The vehicle of any one of claims 8-11, wherein, The load device comprises a second mutual inductor, a third conversion circuit and a second battery, and the third conversion circuit is connected between the second battery and the second mutual inductor.

13. The vehicle of any one of claims 8-12, wherein, The power generation device comprises a plurality of power generation units, and each power generation unit comprises a power generation element, a diode and a resistor. The first end of the power generation element is connected with the first end of the first resistor. The anode of the diode is connected with the first end of the power generation element. The cathode of the diode is connected with the second end of the power generation element. The second end of the power generation element and the second end of the resistor serve as an output end of the power generation unit.

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