Charging and discharging control circuit, charging and discharging control method, electrical equipment and vehicle

Abstract

The invention relates to a charge and discharge control circuit, a charge and discharge control method, electrical equipment and a vehicle, the charge control circuit comprises a battery, a voltage conversion module connected between the battery and a motor controller, and a charge and discharge interface used for connecting an external circuit to realize charge and discharge between the external circuit and the battery, a switch module used for controlling on-off of electric connection between a voltage conversion module and a charging and discharging interface is arranged, so that the voltage conversion module is multiplexed to realize voltage conversion between a battery and a motor controller, and voltage conversion between the battery and the charging and discharging interface is realized; therefore, the cost and the size of the charging and discharging control circuit are reduced, and the occupied vehicle space is correspondingly reduced.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a charge and discharge control circuit, a charge and discharge control method, an electrical device, and a vehicle. Background Art

[0002] With the rapid development of battery technology, vehicle-to-vehicle charging technology has gradually matured. In order to meet users' demand for long charging time, the use of high-power DC charging technology to achieve vehicle-to-vehicle charging is an inevitable trend in the development of the electric vehicle industry.

[0003] However, in high-power DC charging technology, because the battery voltages of the charging and discharging vehicles may differ, vehicle-to-vehicle charging requires the use of a DC-DC converter (DC-DC converter) to achieve voltage conversion. The power of the DC-DC converter determines the power of vehicle-to-vehicle DC charging. To shorten vehicle-to-vehicle charging time, the DC-DC converter is generally high in power, resulting in high cost, bulk, and space occupation in the vehicle. Summary of the Invention

[0004] The embodiments of the present application provide a charge and discharge control circuit, which improves the problem of high vehicle cost caused by the need to equip a DC-DC converter when using high-power direct current to achieve vehicle-to-vehicle charging, thereby at least partially solving the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a charge and discharge control circuit is provided, comprising:

[0006] Battery;

[0007] a voltage conversion module, adapted to be connected between the battery and the motor controller, and used to input the electric energy provided by the battery to the motor controller;

[0008] A charge and discharge interface, used to connect to an external circuit and realize charging and discharging between the external circuit and the battery;

[0009] The switch module is used to control the on / off of the electrical connection between the voltage conversion module and the charge and discharge interface.

[0010] Optionally, when the voltage of the external circuit does not match the voltage of the battery, the switch module controls the electrical connection between the charge and discharge interface and the voltage conversion module, so that the voltage conversion module converts the voltage output by the external circuit into a first target voltage to boost charging or buck charging the battery, or converts the voltage output by the battery into a second target voltage to boost discharge or buck discharge the external circuit.

[0011] Optionally, the switch module includes:

[0012] The first switch unit is connected between the voltage conversion module and the charge and discharge interface, and is used to control the on and off of the electrical connection between the charge and discharge interface and the voltage conversion module.

[0013] Optionally, the switch module further includes:

[0014] The second switch unit is connected between the voltage conversion module and the battery, and is used to control the on / off of the electrical connection between the battery and the voltage conversion module.

[0015] Optionally, the switch module further includes:

[0016] The third switch unit is connected between the charge and discharge interface and the battery, and is used to control the on and off of the electrical connection between the charge and discharge interface and the battery.

[0017] Optionally, the voltage conversion module includes:

[0018] A first phase bridge arm includes a first switching element and a second switching element connected in series;

[0019] A second phase bridge arm includes a third switching element and a fourth switching element connected in series;

[0020] a first inductor element connected between a connection node between the first switching element and the second switching element and a first terminal of the voltage conversion module;

[0021] a second inductor element connected between a connection node between the third switch element and the fourth switch element and the first end of the voltage conversion module;

[0022] The first switch element and the third switch element are connected to the second end of the voltage conversion module, and the second switch element and the fourth switch element are connected to the third end of the voltage conversion module.

[0023] Optionally, when the electrical connection between the charge and discharge interface and the voltage conversion module is established, in a first time period, the first switching element and the third switching element are turned on, and the second switching element and the fourth switching element are turned off; and in a second time period, the second switching element and the fourth switching element are turned on, and the first switching element and the third switching element are turned off;

[0024] The first time period and the second time period are performed alternately to achieve boost charging or buck charging of the battery by the external circuit, or boost discharge or buck discharge of the battery to the external circuit.

[0025] Optionally, the first switch unit includes:

[0026] A first switch is connected between the second end of the voltage conversion module and the positive terminal of the charge and discharge interface;

[0027] a second switch connected between the third terminal of the voltage conversion module and the negative terminal of the charge and discharge interface;

[0028] Wherein, the second switch unit includes:

[0029] a third switch connected between the positive electrode of the battery and the first end of the voltage conversion module;

[0030] a fourth switch connected between the negative electrode of the battery and the third terminal of the voltage conversion module;

[0031] a fifth switch connected between the positive electrode of the battery and the second end of the voltage conversion module;

[0032] Wherein, the third switch unit includes:

[0033] a sixth switch connected between the first switch and the positive terminal of the charge and discharge interface;

[0034] The seventh switch is connected between the second switch and the negative terminal of the charge and discharge interface.

[0035] Optionally, when the charge and discharge interface is electrically connected to the external circuit:

[0036] The fourth switch, the fifth switch, the sixth switch, and the seventh switch are closed, so that the battery, the fifth switch, the voltage conversion module, the sixth switch, the charge and discharge interface, the seventh switch, and the fourth switch are connected to form a charge and discharge loop between the battery and the external circuit; or

[0037] The third switch, the fourth switch, the first switch, and the second switch are closed, so that the battery, the first switch, the voltage conversion module, the first switch, the charge and discharge interface, the second switch, and the fourth switch are connected to form a charge and discharge loop between the battery and the external circuit.

[0038] Optionally, when the external circuit charges the battery through the charge and discharge interface, the switch module is configured to:

[0039] In a first charging stage, the third switch, the fourth switch, the first switch, and the second switch are closed, and the first switch element and the third switch element are turned on to form a first charging circuit for the battery;

[0040] In the second charging stage, the third switch and the fourth switch are closed, and the second switch element and the fourth switch element are turned on to form a second charging circuit for the battery;

[0041] The first charging stage and the second charging stage are performed alternately, so that the external circuit can alternately step down and charge the battery through the first charging circuit and the second charging circuit.

[0042] Optionally, when the external circuit charges the battery through the charge and discharge interface, the switch module is configured to:

[0043] In the third charging stage, the sixth switch and the seventh switch are closed, and the second switch element and the fourth switch element are turned on to form a third charging loop;

[0044] In a fourth charging stage, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are closed, and the first switch element and the third switch element are turned on to form a fourth charging loop;

[0045] The third charging stage and the fourth charging stage are performed alternately, so that the external circuit can alternately boost and charge the battery through the third charging circuit and the fourth charging circuit.

[0046] Optionally, when the battery discharges to the external circuit through the charge and discharge interface, the switch module is configured to:

[0047] In the first discharging stage, the third switch and the fourth switch are closed, and the second switch element and the fourth switch element are turned on to form a first discharging loop;

[0048] In the second discharging stage, the third switch, the fourth switch, the first switch, and the second switch are closed, and the first switching element and the third switching element are turned on to form a second discharging loop;

[0049] The first discharge stage and the second discharge stage are performed alternately, so that the battery performs boost discharge to the external circuit alternately through the first discharge circuit and the second discharge circuit.

[0050] Optionally, when the battery discharges to the external circuit through the charge and discharge interface, the switch module is configured to:

[0051] In the third discharging stage, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are closed, and the first switching element and the third switching element are turned on to form a third discharging loop;

[0052] In the fourth discharging stage, the sixth switch and the seventh switch are closed, and the second switch element and the fourth switch element are turned on to form a fourth discharging loop;

[0053] The third discharge stage and the fourth discharge stage are performed alternately, so that the battery performs voltage-reducing discharge alternately to the external circuit through the third discharge circuit and the fourth discharge circuit.

[0054] Optionally, when the charge and discharge interface is not electrically connected to the external circuit, the third switch and the fourth switch are closed, so that the battery, the third switch, the voltage conversion module, the motor controller and the fourth switch are connected, forming an energy transmission path between the battery and the motor controller.

[0055] According to a second aspect of the present application, a charge and discharge control method is further provided, which is applied to the charge and discharge control circuit as described in any one of the above, comprising:

[0056] When the external circuit is electrically connected to the charge and discharge interface, the switch module controls the electrical connection between the voltage conversion module and the charge and discharge interface to form a charge and discharge loop between the battery and the external circuit.

[0057] According to a third aspect of the present application, an electrical device is further provided, comprising a charge and discharge control circuit as described in any one of the above.

[0058] According to a fourth aspect of the present application, a vehicle is also provided, comprising the electrical device as described above.

[0059] In the charge and discharge control circuit of the embodiment of the present application, through the above-mentioned technical solution, on the basis of the charging control circuit including a battery, a voltage conversion module connected between the battery and the motor controller, and a charge and discharge interface for connecting an external circuit to realize charging and discharging between the external circuit and the battery, a switch module for controlling the on and off of the electrical connection between the voltage conversion module and the charge and discharge interface is provided. The voltage conversion module can be reused to realize voltage conversion between the battery and the motor controller and to realize voltage conversion between the battery and the charge and discharge interface, thereby avoiding the additional provision of another voltage converter to realize voltage conversion between the charge and discharge interface and the battery, reducing the production cost and volume of the charge and discharge control circuit, thereby reducing the cost of the corresponding vehicle and the vehicle space occupied by the charge and discharge control circuit, which is conducive to alleviating the endurance and charging problems of new energy vehicles.

[0060] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0062] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0063] Figure 1 is a block diagram of a charge and discharge control circuit provided in an exemplary embodiment of the present application;

[0064] Figure 2 is a schematic diagram of a vehicle-to-vehicle charging scenario provided in an exemplary embodiment of the present application;

[0065] Figure 3 is a block diagram of vehicle-to-vehicle charging provided in an exemplary embodiment of the present application;

[0066] Figure 4 is a circuit diagram of a charge and discharge control circuit provided in an exemplary embodiment of the present application;

[0067] Figures 5 to 8 Schematic diagram of current flow during operation of the charge and discharge control circuit provided in an exemplary embodiment of the present application.

[0068] Description of reference numerals:

[0069] 100, charge and discharge control circuit; 10, motor; 20, battery; 30, voltage conversion module; 40, charge and discharge interface; 50, switch module;

[0070] 101. Motor controller; 102. Motor body;

[0071] 301, inductor unit; 302, control unit;

[0072] 3021, first control unit; 3022, second control unit;

[0073] 501, first switch unit; 502, second switch unit; 503, third switch unit;

[0074] 5021, first sub-switch unit; 5022, second sub-switch unit; 5023, third sub-switch unit;

[0075] A. a first end of the voltage conversion module 30; B. a second end of the voltage conversion module 30; C. a third end of the voltage conversion module 30;

[0076] L1, first inductor element; L2, second inductor element; L3, third inductor element; L4, fourth inductor element; L5, fifth inductor element;

[0077] C1, first capacitance element; C2, second capacitance element;

[0078] Q1, first switching element; Q2, second switching element; Q3, third switching element; Q4, fourth switching element; Q5, fifth switching element; Q6, sixth switching element; Q7, seventh switching element; Q8, eighth switching element; Q9, ninth switching element; Q10, tenth switching element;

[0079] k4, first switch; k5, second switch; k1, third switch; k2, fourth switch; k3, fifth switch; k6, sixth switch; k7, seventh switch. DETAILED DESCRIPTION

[0080] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0081] According to the first aspect of this application, referring to Figure 1 The present application provides a charge and discharge control circuit 100, which includes a battery 20, a voltage conversion module 30 connected between the battery 20 and a motor controller 101, a charge and discharge interface 40 for connecting to an external circuit, and a switch module 50 for controlling the on and off of the electrical connection between the voltage conversion module 30 and the charge and discharge interface 40. The voltage conversion module 30 is used to convert a first power supply voltage provided by the battery 20 into a second power supply voltage for driving a motor body 102 through the motor controller 101, and the charge and discharge interface 40 is used to realize charging and discharging between the external circuit and the battery 20. The motor controller 101 and the motor body 102 can be collectively referred to as a motor 10.

[0082] The charge and discharge control circuit 100 of the present application can be applied to power devices including but not limited to vehicles, and can realize charging and discharging between the power device and an external circuit. Specifically, the charge and discharge control circuit 100 of the present application can at least include the following working mode: when the charging pile is electrically connected to the charge and discharge interface 40 as an external circuit, the voltage output by the charging pile is transmitted to the battery 20 to charge it; the first power supply voltage output by the battery 20 is converted into a second power supply voltage by the voltage conversion module 30 and input to the motor controller 101 of the motor 10, and the motor controller 101 drives the motor body 102 to work to drive the vehicle.

[0083] like Figure 2 As shown, in special cases, one vehicle can be charged by charging and discharging between vehicles. For example, one of vehicle 1 and vehicle 2 can discharge to the other so that the other is charged. Figure 3 As shown, in high-power DC charging technology, because the battery voltages of the charging and discharging vehicles may differ, the vehicles need to be equipped with DC-DC converters (DC-DC converters) to achieve voltage conversion to enable charging and discharging between any two vehicles. For example, in vehicle 1, DC-DC converter 1 needs to be installed between the corresponding battery 1 and charging and discharging port 1, and in vehicle 2, DC-DC converter 2 needs to be installed between the corresponding battery 2 and charging and discharging port 2.

[0084] It should be noted that Figure 3 DC-DC 1 and DC-DC 2 are specifically configured to achieve voltage conversion between the corresponding battery and the charging and discharging port. They are additional modules different from the module used to achieve the above-mentioned "converting the first supply voltage into the second supply voltage". That is, the prior art requires the provision of a module (a DC-DC converter) for achieving the above-mentioned "converting the first supply voltage into the second supply voltage" and another DC-DC converter for achieving voltage conversion between the corresponding battery and the charging and discharging port, resulting in high circuit costs and more vehicle space occupied.

[0085] It can be understood that the present application is based on the provision of a voltage conversion module 30 for converting the first power supply voltage provided by the battery 20 into a second power supply voltage for driving the motor 10, and is provided with a switch module 50 for controlling the on and off of the electrical connection between the voltage conversion module 30 and the charge and discharge interface 40. That is, by providing the switch module 50, it can be realized whether the voltage conversion module 30 and the charge and discharge interface 40 are electrically connected, so that the voltage conversion module 30 can realize the conversion of the first power supply voltage into the second power supply voltage, and can also be electrically connected to the charge and discharge interface 40 through the switch module 50 to realize voltage conversion between the charge and discharge interface 40 and the battery 20.

[0086] Therefore, in this application, by setting a switch module 50, the only voltage conversion module 30 is reused to realize voltage conversion between the battery 20 and the motor controller 101, and to realize voltage conversion between the battery 20 and the charge and discharge interface 40, thereby avoiding the additional setting of another DC-DC converter to realize voltage conversion between the charge and discharge interface 40 and the battery 20, reducing the cost and volume of the charge and discharge control circuit 100, thereby reducing the cost of the corresponding vehicle and the vehicle space occupied by the charge and discharge control circuit 100, which is conducive to alleviating the endurance and charging problems of new energy vehicles.

[0087] In some embodiments, reference Figure 1 When the voltage of the external circuit does not match the voltage of the battery 20, the switch module 50 controls the electrical connection between the charge and discharge interface 40 and the voltage conversion module 30 to be turned on, so that the voltage conversion module 30 converts the voltage output by the external circuit into a first target voltage to perform boost charging or buck charging on the battery 20, or converts the voltage output by the battery 20 into a second target voltage to perform boost discharge or buck discharge on the external circuit.

[0088] As discussed above, the switch module 50 is used to control the on / off electrical connection between the voltage conversion module 30 and the charge / discharge interface 40, and to electrically connect the voltage conversion module 30 to the battery 20. If the external circuit is charging the battery 20, the voltage conversion module 30 is used to convert the voltage output by the external circuit to the first target voltage required by the battery 20. If the battery 20 is charging the external circuit, the voltage conversion module 30 is used to convert the voltage output by the battery 20 to the second target voltage required by the external circuit.

[0089] On the one hand, for charging and discharging between vehicles, for example Figure 2 As shown, when vehicle 1 (including the above-mentioned charge and discharge control circuit 100) needs vehicle 2 (i.e., the above-mentioned external circuit) to charge it, the voltage required by vehicle 1 (i.e., the above-mentioned first target voltage, such as 500V) is higher than the voltage that vehicle 2 can provide (i.e., the voltage output by the above-mentioned external circuit, such as 400V). Then vehicle 1 must increase the voltage 400V provided by vehicle 2 to 500V (i.e., through the above-mentioned switch module 50, control the electrical connection between the voltage conversion module 30 and the charge and discharge interface 40, so that the voltage conversion module 30 converts the voltage output by the external circuit into the first target voltage) before it can charge vehicle 1. Among them, due to the configuration differences between different vehicles, for example, vehicle 2 can only provide a voltage of 400V but not 500V, so vehicle 1 needs to boost the voltage itself. Similarly, the same is true for step-down. Therefore, regardless of the configuration of the two vehicles targeted by this application, mutual charging can be achieved.

[0090] On the other hand, with regard to charging from charging piles to vehicles, many charging piles currently on the market have a maximum voltage of 500V, which cannot meet the charging needs of vehicles with an 800V voltage. The 500V voltage of the charging pile needs to be increased to the 800V voltage required by the vehicle to meet the vehicle's charging needs. Therefore, this application can also solve the problem of mismatch between the charging voltage provided by the charging pile and the charging voltage required by the vehicle.

[0091] In some embodiments, as Figure 1 and Figure 4 As shown, the switch module 50 includes a first switch unit 501 connected between the voltage conversion module 30 and the charge and discharge interface 40 , and the first switch unit 501 is used to control the on and off of the electrical connection between the charge and discharge interface 40 and the voltage conversion module 30 .

[0092] Specifically, the voltage conversion module 30 may include a first terminal A, a second terminal B, and a third terminal C. Two ends of the first switch unit 501 are respectively connected to the second terminal B and the third terminal C of the voltage conversion module 30, and the other two ends of the first switch unit 501 are respectively connected to the two ends of the charge-discharge interface 40. In this embodiment, the first switch unit 501 is electrically connected between the second terminal B and the third terminal C of the voltage conversion module 30 and the charge-discharge interface 40, and can respectively control whether the second terminal B and the third terminal C of the voltage conversion module 30 are connected to the charge-discharge interface 40.

[0093] In some embodiments, as Figure 1 and Figure 4 As shown, the switch module 50 further includes a second switch unit 502 connected between the voltage conversion module 30 and the battery 20 , and the second switch unit 502 is used to control the on / off of the electrical connection between the battery 20 and the voltage conversion module 30 .

[0094] Specifically, three terminals of the second switch unit 502 are respectively connected to the first terminal A, the second terminal B, and the third terminal C of the voltage conversion module 30, and the other two terminals of the second switch unit 502 are respectively connected to the two terminals of the battery 20. In this embodiment, the second switch unit 502 is electrically connected between the positive and negative electrodes of the battery 20 and the first terminal A, the second terminal B, and the third terminal C of the voltage conversion module 30, thereby separately controlling whether the second terminal B and the third terminal C of the voltage conversion module 30 are connected to the battery 20.

[0095] In some embodiments, as Figure 1 and Figure 4As shown, the switch module 50 further includes a third switch unit 503 connected between the charge and discharge interface 40 and the battery 20 , and the third switch unit 503 is used to control the on and off of the electrical connection between the charge and discharge interface 40 and the battery 20 .

[0096] Specifically, two ends of the third switch unit 503 are respectively connected to the first end A and the third end C of the voltage conversion module 30, and the other two ends of the third switch unit 503 are respectively connected to the two ends of the charge-discharge interface 40. The third switch unit 503 is also used to control the on / off electrical connection between the charge-discharge interface 40 and the first end A and the third end C of the voltage conversion module 30. In this embodiment, the third switch unit 503 is electrically connected between the first end A and the third end C of the voltage conversion module 30 and the charge-discharge interface 40, and can respectively control whether the first end A and the third end C of the voltage conversion module 30 are connected to the charge-discharge interface 40.

[0097] Furthermore, one end of the motor controller 101 is connected to the second end B of the voltage conversion module 30 and one end of the motor body 102 , and the other end of the motor controller 101 is connected to the third end C of the voltage conversion module 30 and the other end of the motor body 102 .

[0098] As discussed above, the first terminal A of the voltage conversion module 30 is connected to the positive electrode of the battery 20, the second terminal B of the voltage conversion module 30 is connected to the first terminal of the motor 10, and the third terminal C of the voltage conversion module 30 is connected to the negative electrode of the battery 20 and the second terminal of the motor 10. The switch module 50 is connected to the first terminal A, the second terminal B, and the third terminal C of the voltage conversion module 30.

[0099] The battery 20 is connected between the first terminal A and the third terminal C of the voltage conversion module 30 to output the first supply voltage to the voltage conversion module 30. The voltage conversion module 30 converts the first supply voltage provided by the battery 20 into a second supply voltage for driving the motor 10. The motor 10 is connected between the second terminal B and the third terminal C of the voltage conversion module 30 to receive the second supply voltage. Simultaneously, the switch module 50 is connected to the first terminal A, the second terminal B, and the third terminal C of the voltage conversion module 30 to control the electrical connection between these three terminals and the corresponding terminals of the battery 20 and the charge-discharge interface 40, thereby controlling whether the voltage conversion module 30 performs corresponding voltage conversion on the voltage output by the battery 20 and / or the voltage output by the charge-discharge interface 40.

[0100] Specifically, refer to Figure 1 and Figure 4The voltage conversion module 30 includes an inductor unit 301 and a control unit 302. The inductor unit 301 is electrically connected to the first terminal A of the voltage conversion module 30. The control unit 302 is electrically connected between the inductor unit 301 and the switch module 50 and is used to control the on / off of the electrical connection between the inductor unit 301 and the switch module 50.

[0101] The control unit 302 controls the electrical connection between the inductor unit 301 and the switch module 50 to control whether the voltage conversion module 30 performs voltage conversion. When the electrical connection between the inductor unit 301 and the switch module 50 is established, the control unit 302 controls the specific path of the electrical connection between the inductor unit 301 and the switch module 50. This, combined with the conduction status of the switch module 50, controls the voltage conversion module 30 to achieve corresponding voltage conversion, such as boosting or stepping down the voltage output by the battery 20, or boosting or stepping down the voltage output by an external circuit.

[0102] Further, refer to Figure 1 and Figure 4 The control unit 302 includes a first control unit 3021 electrically connected between the inductor unit 301 and the second terminal B of the voltage conversion module 30, and a second control unit 3022 electrically connected between the inductor unit 301 and the third terminal C of the voltage conversion module 30. The first control unit 3021 is used to control the on / off electrical connection between the inductor unit 301 and the second terminal B of the voltage conversion module 30, and the second control unit 3022 is used to control the on / off electrical connection between the inductor unit 301 and the third terminal C of the voltage conversion module 30.

[0103] It can be understood that this embodiment is achieved by setting a first control unit 3021 and a second control unit 3022 to respectively control the on and off of the electrical connection between the second end B and the third end C of the voltage conversion module 30 and the inductor unit 301, so that a path is formed between the first end A and the second end B or the third end C of the voltage conversion module 30, so as to form different current loops in combination with the control conditions of the switch module 50, so as to control the voltage conversion module 30 to achieve corresponding voltage conversion.

[0104] Specifically, refer to Figure 1 and Figure 4The inductor unit 301 may include a first inductor element L1, the first control unit 3021 may include a first switch element Q1, and the second control unit 3022 may include a second switch element Q2. The first switch element Q1 and the second switch element Q2 are arranged in series between the second terminal B and the third terminal C of the voltage conversion module 30. One end of the first inductor element L1 is electrically connected to the first terminal A of the voltage conversion module 30, and the other end is electrically connected to the node between the first switch element Q1 and the second switch element Q2. The first switch element Q1 and the second switch element Q2 can be turned on in a time-sharing manner, so that the voltage conversion module 30 generates a current between the first terminal A and the second terminal B of the voltage conversion module 30 and a current between the first terminal A and the third terminal C of the voltage conversion module 30 in a time-sharing manner.

[0105] Furthermore, to improve the reliability of the voltage conversion module 30, the inductor unit 301 may further include a second inductor L2. Accordingly, the first control unit 3021 may further include a third switch Q3, and the second control unit 3022 may include a fourth switch Q4. The third switch Q3 and the fourth switch Q4 are connected in series between the second terminal B and the third terminal C of the voltage conversion module 30, and one end of the second inductor L2 is electrically connected to the first terminal A of the voltage conversion module 30. The relative electrical connection relationship and synergistic effect of the second inductor L2, the third switch Q3, and the fourth switch Q4 can be referenced to the relative electrical connection relationship and synergistic effect of the first inductor L1, the first switch Q1, and the second switch Q2 described above.

[0106] In combination with the above discussion, it can be seen that the voltage conversion module 30 includes a first phase bridge arm, a second phase bridge arm, a first inductance element L1, and a second inductance element L2. The first phase bridge arm includes a first switch element Q1 and a second switch element Q2 connected in series. The second phase bridge arm includes a third switch element Q3 and a fourth switch element Q4 connected in series. The first inductance element L1 is connected between the connection node between the first switch element Q1 and the second switch element Q2 and the first end A of the voltage conversion module 30. The second inductance element L2 is connected between the connection node between the third switch element Q3 and the fourth switch element Q4 and the first end A of the voltage conversion module 30.

[0107] The first switch element Q1 and the third switch element Q3 are connected to the second end B of the voltage conversion module, and the second switch element Q2 and the fourth switch element Q4 are connected to the third end C of the voltage conversion module.

[0108] Further, refer to Figure 1 、 Figure 4The charge and discharge control circuit 100 of the present application may further include a first capacitor element C1 electrically connected between the first terminal A and the third terminal C of the voltage conversion module 30. The motor controller 101 may include a plurality of switching elements and a second capacitor element C2, and the motor body 102 may include a plurality of inductance elements corresponding to the plurality of switching elements in the motor controller 101. The plurality of switching elements in the motor controller 101 may form an inverter bridge structure to convert the DC voltage converted by the voltage conversion module 30 when the vehicle is driving into an AC voltage for the operation of the power supply body 102. The number of switching elements in the motor controller 101 may be twice the number of inductance elements in the motor body 102. Among them, the first capacitor element C1 and the second capacitor element C2 can play the role of voltage stabilization and filtering.

[0109] For example, the plurality of switching elements in the motor controller 101 include Figure 4 The fifth switching element Q5, the sixth switching element Q6, the seventh switching element Q7, the eighth switching element Q8, the ninth switching element Q9, and the tenth switching element Q10 in the motor body 102 correspond to the plurality of inductance elements in the motor body 102. Figure 4 The third inductor element L3, the fourth inductor element L4, and the fifth inductor element L5 in the motor controller 101. The six switching elements in the motor controller 101 form a three-phase inverter bridge structure.

[0110] In some embodiments, when the electrical connection between the charge and discharge interface 40 and the voltage conversion module 30 is established, during a first period, the first switch element Q1 and the third switch element Q3 are turned on, and the second switch element Q2 and the fourth switch element Q4 are turned off. During a second period, the second switch element Q2 and the fourth switch element Q4 are turned on, and the first switch element Q1 and the third switch element Q3 are turned off. The first and second periods are alternately performed to enable the external circuit to boost or buck charge the battery 20, or to boost or buck discharge the battery 20 to the external circuit.

[0111] That is, by controlling the first control unit 3021 and the second control unit 3022 to work alternately, the external circuit can perform boost charging or buck charging on the battery 20 , or the battery 20 can perform boost discharge or buck discharge on the external circuit.

[0112] Among them, reference Figure 1 、 Figure 4 、 Figure 5 (a) and Figure 6(a) The first switch unit 501 is used to control the electrical connection between the voltage conversion module 30 and the charge and discharge interface 40 to be conductive when the external circuit charges the battery 20 through the charge and discharge interface 40, so that the voltage conversion module 30 converts the voltage output by the external circuit into a first target voltage for charging the battery 20. That is, when the external circuit charges the battery 20 through the charge and discharge interface 40, the first switch unit 501 needs to be closed to enable the voltage conversion module 30 to receive the voltage output by the external circuit and then convert it.

[0113] Among them, reference Figure 1 、 Figure 4 and Figure 8 (b) The first switch unit 501 is configured to control the electrical connection between the voltage conversion module 30 and the charge / discharge interface 40 to be conductive when the battery 20 is discharging to the external circuit through the charge / discharge interface 40, so that the voltage conversion module 30 converts the voltage output by the battery 20 into a second target voltage for charging the external circuit and transmits it to the charge / discharge interface 40. That is, when the battery 20 is discharging to the external circuit through the charge / discharge interface 40, the first switch unit 501 is closed to cause the voltage conversion module 30 to transmit the second target voltage to the charge / discharge interface 40 for use by the external circuit.

[0114] Among them, reference Figure 1 、 Figure 4 、 Figure 5 (a), (b) and Figure 6 (b) The second switch unit 502 is configured to control the electrical connection between the voltage conversion module 30 and the battery 20 to be conductive when the external circuit charges the battery 20 through the charge and discharge interface 40, so that the voltage conversion module 30 converts the voltage output by the external circuit into a first target voltage for charging the battery 20 and transmits it to the battery 20. That is, when the external circuit charges the battery 20 through the charge and discharge interface 40, the second switch unit 502 needs to be closed to transmit the first target voltage generated by the voltage conversion module 30 to the battery 20.

[0115] Among them, reference Figure 1 、 Figure 4 、 Figure 7 (a) and Figure 8(a) and (b) of the present invention, the second switch unit 502 is used to control the electrical connection between the voltage conversion module 30 and the battery 20 to be conductive when the battery 20 is discharging to the external circuit through the charge and discharge interface 40, so that the voltage conversion module 30 converts the voltage output by the battery 20 into a second target voltage for charging the external circuit. In other words, when the battery 20 is discharging to the external circuit through the charge and discharge interface 40, the second switch unit 502 needs to be closed so that the voltage conversion module 30 can receive the voltage output by the battery 20 and convert it.

[0116] Among them, reference Figure 1 and Figure 4 The second switch unit 502 includes a first sub-switch unit 5021 connected between the positive electrode of the battery 20 and the first end A of the voltage conversion module 30, a second sub-switch unit 5022 connected between the negative electrode of the battery 20 and the third end C of the voltage conversion module 30, and a third sub-switch unit 5023 connected between the positive electrode of the battery 20 and the second end B of the voltage conversion module 30.

[0117] The first sub-switch unit 5021 and the second sub-switch unit 5022 are used to control the electrical connection between the voltage conversion module 30 and the battery 20 when the external circuit charges the battery 20 through the charge and discharge interface 40, so that the voltage conversion module 30 transmits the first target voltage for charging the battery 20 after the voltage output by the external circuit is stepped down to the battery 20 (refer to Figure 5 (a), (b)), and further configured to control the electrical connection between the voltage conversion module 30 and the battery 20 to be turned on when the battery 20 discharges to the external circuit through the charge and discharge interface 40, so that the voltage conversion module 30 boosts the voltage output by the battery 20 to generate a second target voltage for charging the external circuit (refer to Figure 8 (a), (b)).

[0118] The second sub-switch unit 5022 and the third sub-switch unit 5023 are used to control the electrical connection between the voltage conversion module 30 and the battery 20 when the external circuit charges the battery 20 through the charge and discharge interface 40, so that the voltage conversion module 30 transmits the first target voltage for charging the battery 20 after the voltage output by the external circuit is boosted to the battery 20 (refer to Figure 6(a), (b)), and further configured to control the electrical connection between the voltage conversion module 30 and the battery 20 to be turned on when the battery 20 is discharged to the external circuit through the charge and discharge interface 40, so that the voltage conversion module 30 steps down the voltage output by the battery 20 to generate the second target voltage (refer to Figure 7 (a), (b)).

[0119] Among them, reference Figure 1 、 Figure 4 and Figure 6 (a) and (b) of the present invention, the third switch unit 503 is used to control the electrical connection between the voltage conversion module 30 and the charge and discharge interface 40 to be conductive when the external circuit charges the battery 20 through the charge and discharge interface 40, so that the voltage conversion module 30 converts the voltage input from the external circuit into a first target voltage for charging the battery 20. That is, when the external circuit charges the battery 20 through the charge and discharge interface 40, the third switch unit 503 needs to be closed to enable the voltage conversion module 30 to receive the voltage output from the external circuit and then convert it.

[0120] Among them, reference Figure 1 、 Figure 4 and Figure 7 (a) and (b), the third switch unit 503 is used to control the electrical connection between the voltage conversion module 30 and the charge and discharge interface 40 to be conductive when the battery 20 is discharging to the external circuit through the charge and discharge interface 40, so that the voltage conversion module 30 converts the voltage output by the battery 20 into a second target voltage for charging the external circuit and transmits it to the charge and discharge interface 40. That is, when the battery 20 is discharging to the external circuit through the charge and discharge interface 40, the third switch unit 503 needs to be closed to enable the voltage conversion module 30 to transmit the second target voltage converted thereby to the charge and discharge interface 40 so that it can be obtained by the external circuit.

[0121] In some embodiments, the first switch unit 501 may include a first switch k4 connected between the second terminal B of the voltage conversion module 30 and the first terminal of the charge-discharge interface 40, and a second switch k5 connected between the third terminal C of the voltage conversion module 30 and the second terminal of the charge-discharge interface 40. The second switch unit 502 includes a third switch K1 connected between the positive electrode of the battery 20 and the first terminal A of the voltage conversion module 30, a fourth switch K2 connected between the negative electrode of the battery 20 and the third terminal C of the voltage conversion module 30, and a fifth switch K3 connected between the positive electrode of the battery 20 and the second terminal B of the voltage conversion module 30. The third switch unit 503 includes a sixth switch K6 connected between the first switch K1 and the positive terminal of the charge-discharge interface 40, and a seventh switch K7 connected between the second switch K2 and the negative terminal of the charge-discharge interface 40.

[0122] As discussed above, when both the first switch k4 and the second switch k5 are closed, a path is formed between the second end B and the third end C of the voltage conversion module 30 and the two ends of the charge and discharge interface 40. Combined with other parts of the switch module 50 and the control method within the voltage conversion module 30, a current can be generated that flows from one end of the charge and discharge interface 40 to the other end.

[0123] As discussed above, when the third switch k1 and the fourth switch k2 are closed, a path is formed between the first terminal A and the third terminal C of the voltage conversion module 30 and the two ends of the battery 20. Combined with other parts of the switch module 50 and the control method within the voltage conversion module 30, a current can be generated that flows from the positive electrode of the battery to the negative electrode, or from the negative electrode of the battery to the positive electrode. When the third switch k1 and the fifth switch k3 are both closed, a current can also be generated that flows from the positive electrode of the battery to the negative electrode, or from the negative electrode of the battery to the positive electrode. The difference lies in whether the voltage conversion module 30 implements a boost function or a buck function.

[0124] As discussed above, when the sixth switch k6 and the seventh switch k7 are closed, a path is formed between the first terminal A and the third terminal C of the voltage conversion module 30 and the two ends of the charge-discharge interface 40. Combined with other parts of the switch module 50 and the control method within the voltage conversion module 30, a current can be generated that flows from one end of the charge-discharge interface 40 to the other end.

[0125] In some embodiments, when the charge and discharge interface 40 is electrically connected to the external circuit: Figure 6 and Figure 7As shown, the fourth switch K2, the fifth switch K3, the sixth switch K6, and the seventh switch K7 are closed, so that the battery 20, the fifth switch K3, the voltage conversion module 30, the sixth switch K6, the charge and discharge interface 40, the seventh switch K7, and the fourth switch K2 are connected to form a charge and discharge loop between the battery 20 and the external circuit; or as Figure 5 and Figure 8 As shown, the third switch K1, the fourth switch K2, the first switch K4, and the second switch K5 are closed, so that the battery 20, the first switch K1, the voltage conversion module 30, the first switch K4, the charge and discharge interface 40, the second switch K5, and the fourth switch K2 are connected to form a charge and discharge loop between the battery 20 and the external circuit.

[0126] Specifically, when the external circuit charges the battery 20 through the charge and discharge interface 40, the switch module 50 is configured as follows: in the first charging stage, Figure 5 As shown in (a), the third switch K1, the fourth switch K2, the first switch K4, and the second switch K5 are closed, and the first switch element Q1 and the third switch element Q3 are turned on to form a first charging circuit for the battery 20; Figure 5 As shown in FIG. 2( b ), in the second charging stage, the third switch K1 and the fourth switch K2 are closed, and the second switch element Q2 and the fourth switch element Q4 are turned on, thereby forming a second charging circuit for the battery 20. The first charging stage and the second charging stage are performed alternately, so that the external circuit alternately steps down and charges the battery 20 via the first charging circuit and the second charging circuit.

[0127] Among them, such as Figure 5 In the first charging circuit shown in (a), the battery 20 and the "first inductor L1 and the second inductor L2" are connected in series to divide the voltage, so that the voltage output by the external circuit through the charge and discharge interface 40 is loaded to both ends of the battery 20 after voltage division. Figure 5 In the second charging circuit shown in (b), “both the first inductor element L1 and the second inductor element L2 ” charge the battery 20 , and the two circuits are alternately formed to form a first target voltage to step down and charge the battery 20 .

[0128] Specifically, when the external circuit charges the battery 20 through the charge and discharge interface 40, the switch module 50 is configured as follows: in the third charging stage, Figure 6As shown in (a), the sixth switch K6 and the seventh switch K7 are closed, and the second switch element Q2 and the fourth switch element Q4 are turned on to form a third charging circuit; in the fourth charging stage, as shown in FIG. Figure 6 As shown in Figure (b), the fourth switch K2, the fifth switch K3, the sixth switch K6, and the seventh switch K7 are closed, and the first switch element Q1 and the third switch element Q3 are turned on, thereby forming a fourth charging circuit. The third charging stage and the fourth charging stage are performed alternately, so that the external circuit alternately boosts and charges the battery 20 through the third and fourth charging circuits.

[0129] Among them, Figure 6 In the third charging circuit shown in (a), the external circuit charges "both the first inductor element L1 and the second inductor element L2" through the charge and discharge interface 40. Figure 6 In the fourth charging circuit shown in (b), "both the first inductor L1 and the second inductor L2" and the external circuit charge the battery 20 together. The two circuits are alternately formed to form a first target voltage to boost the battery 20.

[0130] Specifically, when the battery 20 discharges to the external circuit through the charge and discharge interface 40, the switch module 50 is configured as follows: in the first discharge stage, Figure 8 As shown in (a), the third switch K1 and the fourth switch K2 are closed, and the second switch element Q2 and the fourth switch element Q4 are turned on to form a first discharge loop; in the second discharge stage, as shown in Figure 7 As shown in Figure (b), the third switch K1, the fourth switch K2, the first switch K4, and the second switch K5 are closed, and the first switch element Q1 and the third switch element Q3 are turned on, thereby forming a second discharge loop. The first discharge phase and the second discharge phase are performed alternately, so that the battery 20 performs boost discharge to the external circuit alternately through the first discharge loop and the second discharge loop.

[0131] Among them, Figure 8 In the first discharge circuit shown in (a), the battery 20 discharges "both the first inductor element L1 and the second inductor element L2". Figure 8 In the second discharge loop shown in (b), "both the first inductor L1 and the second inductor L2" and the battery 20 discharge the external circuit together. The two loops are alternately formed to form a second target voltage to perform boost discharge to the external circuit.

[0132] Specifically, when the battery 20 discharges to the external circuit through the charge and discharge interface 40, the switch module (50) is configured as follows: in the third discharge stage, Figure 7 As shown in (a), the fourth switch K2, the fifth switch K3, the sixth switch K6, and the seventh switch K7 are closed, and the first switch element Q1 and the third switch element Q3 are turned on to form a third discharge loop; in the fourth discharge stage, as shown in Figure 7 As shown in FIG. 2( b ), the sixth switch K6 and the seventh switch K7 are closed, and the second switch element Q2 and the fourth switch element Q4 are turned on, thereby forming a fourth discharge loop. The third discharge phase and the fourth discharge phase are performed alternately, so that the battery 20 performs step-down discharge to the external circuit alternately through the third discharge loop and the fourth discharge loop.

[0133] Among them, Figure 7 In the third discharge circuit shown in (a), the first inductor element L1, the second inductor element L2 and the external circuit are connected in series to divide the voltage, so that the voltage output by the battery 20 is discharged to the external circuit through the charge and discharge interface 40. Figure 7 In the fourth discharge loop shown in (b), "both the first inductor element L1 and the second inductor element L2" discharge to the external circuit, and the two loops are alternately formed to form a second target voltage to perform step-down discharge to the external circuit.

[0134] In some embodiments, as Figure 1 and Figure 4 As shown, when the charge and discharge interface 40) is not electrically connected to the external circuit, the third switch K1 and the fourth switch K2 are closed, so that the battery 20, the third switch K1, the voltage conversion module 30, the motor controller 101 and the fourth switch K2 are connected, forming an energy transmission path between the battery 20 and the motor controller 101.

[0135] That is, at this time, the first power supply voltage output by the battery 20 is converted into a second power supply voltage by the voltage conversion module 30 and input into the motor controller 101 of the motor 10. The motor controller 101 drives the motor body 102 to work to drive the vehicle.

[0136] According to a second aspect of the present application, the present application provides a charge and discharge control method, which is applied to the charge and discharge control circuit as described in any one of the above, including but not limited to the following steps:

[0137] S1, when the external circuit is electrically connected to the charge and discharge interface, the switch module is used to control the electrical connection between the voltage conversion module and the charge and discharge interface to form a charge and discharge loop between the battery and the external circuit.

[0138] The charge and discharge circuits may include but are not limited to the first charge circuit, the second charge circuit, the third charge circuit, the fourth charge circuit, the first discharge circuit, the second discharge circuit, the third discharge circuit, and the fourth discharge circuit mentioned above. For the specific working process, please refer to the relevant discussion above.

[0139] Based on the above discussion on the charge and discharge control circuit and its control method, it can be concluded that the charge and discharge control circuit 100 of the present application includes at least the following operating modes:

[0140] 1. Driving mode: When the vehicle is driving, Figure 4 As shown, the electric energy of the battery 20 in the vehicle's charge and discharge control circuit 100 is input to the motor controller 101 through the voltage conversion module 30. At this time, the third switch k1 and the fourth switch k2 are closed, and the motor controller 101 drives the motor body 102 to work;

[0141] 2. Charging mode: A charging pile or other vehicle is connected to the charging and discharging interface 40 in the charging and discharging control circuit 100 of the vehicle as an external circuit. There are three situations:

[0142] (1) When the voltage of the charge and discharge interface 40 matches the first target voltage required by the battery 20, as shown in FIG. Figure 4 As shown, the voltage output by the external circuit is sent to the battery 20 through the third switch unit 503 and the second switch unit 502. At this time, the sixth switch k6, the seventh switch k7, the third switch k1, and the fourth switch k2 are closed, and the voltage output by the external circuit directly charges the battery 20.

[0143] (2) When the voltage of the charge and discharge interface 40 is greater than the first target voltage required by the battery, Figure 5 As shown, the voltage output by the external circuit is sent to the battery 20 through the first switch unit 501, the voltage conversion module 30 and the second switch unit 502. Figure 5 As shown in (a), the first switch k4, the second switch k5, the third switch k1, and the fourth switch k2 are closed, and the external circuit charges the first inductor L1 / the second inductor L2 and the battery 20 through the charge and discharge interface 40. According to the series voltage division, the voltage across the battery 20 is less than the voltage output by the external circuit. Figure 5 As shown in (b), the third switch k1 and the fourth switch k2 are closed, and the first inductor L1 / the second inductor L2 charges the battery 20 in a freewheeling manner. Similarly, the voltage across the battery 20 is lower than the voltage output by the external circuit, so this is called a charging buck mode;

[0144] (3) When the voltage of the charge and discharge interface 40 is lower than the first target voltage required by the battery, Figure 6As shown, the voltage output by the external circuit is sent to the battery 20 through the third switch unit 503, the voltage conversion module 30 and the second switch unit 502. Figure 6 As shown in (a), the sixth switch k6 and the seventh switch k7 are closed, and the external circuit charges the first inductor element L1 / the second inductor element L2 through the charge and discharge interface 40. Figure 6 As shown in (b), the sixth switch k6, the seventh switch k7, the fourth switch k2, and the fifth switch k3 are all closed, the external circuit charges the battery 20 through the charge and discharge interface 40, and the first inductor L1 / the second inductor L2 also charges the battery 20 in a freewheeling manner, so that the voltage across the battery 20 is greater than the voltage output by the external circuit. This is called the charging boost mode;

[0145] 3. Discharge mode: The charge and discharge interface 40 in the vehicle's charge and discharge control circuit 100 is connected to an external circuit. There are two situations:

[0146] (1) When the second target voltage required by the external circuit is less than the voltage output by the battery 20, as shown in FIG. Figure 7 As shown, the output voltage of the battery 20 is sent to the charge and discharge interface 40 through the second switch unit 502, the voltage conversion module 30 and the third switch unit 503. Figure 7 As shown in (a), the fourth switch k2, the fifth switch k3, the sixth switch k6, and the seventh switch k7 are closed, and the battery 20 charges the first inductor L1 / the second inductor L2, and charges the external circuit through the charge and discharge interface 40. According to the series voltage division, the voltage across the external circuit is less than the voltage output by the battery 20. Figure 7 As shown in (b), the sixth switch k6 and the seventh switch k7 are closed, and the first inductor L1 / the second inductor L2 charges the external circuit by freewheeling. Similarly, the voltage across the external circuit is lower than the voltage output by the battery 20, so this is called the discharge buck mode;

[0147] (2) When the second target voltage required by the external circuit is less than the voltage output by the battery 20, as shown in FIG. Figure 8 As shown, the output voltage of the battery 20 is sent to the charge and discharge interface 40 through the second switch unit 502, the voltage conversion module 30 and the first switch unit 501. Figure 8 As shown in (a), the third switch k1 and the fourth switch k2 are closed, and the battery 20 charges the first inductor element L1 / the second inductor element L2. Figure 8As shown in (b), the third switch k1, the fourth switch k2, the first switch k4, and the second switch k5 are all closed, the battery 20 charges the external circuit through the charge and discharge interface 40, and the first inductor element L1 / the second inductor element L2 also charges the external circuit through the charge and discharge interface 40 in a freewheeling manner, so that the voltage across the external circuit is greater than the voltage output by the battery 20, so it is called the discharge boost mode.

[0148] Among them, the first switching element Q1 and the second switching element Q2 can be turned on in a time-sharing manner, and both can be controlled by a control signal. Regardless of whether it is a charging buck mode, a charging boost mode, a discharging buck mode or a discharging boost mode, the ratio of the high potential and the low potential of the control signal (i.e., the duty cycle) is adjusted to control the on-time of the first switching element Q1 and the on-time of the second switching element Q2, thereby controlling the degree of boost and the degree of buck, thereby obtaining the above-mentioned first target voltage and second target voltage.

[0149] According to a third aspect of the present application, an electrical device is provided, comprising the aforementioned charge and discharge control circuit. The electrical device has all the beneficial effects of the aforementioned charge and discharge control circuit, which will not be further elaborated herein.

[0150] According to a fourth aspect of the present application, a vehicle is provided, which includes the above-mentioned electrical equipment. The vehicle has all the beneficial effects of the above-mentioned electrical equipment, which will not be described in detail in this application.

[0151] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc., and this application does not make any specific restrictions on this.

[0152] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0153] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0154] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0155] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A charge and discharge control circuit, characterized in that: include: Battery (20); a voltage conversion module (30), adapted to be connected between the battery and the motor controller (101), and used to input the electric energy provided by the battery to the motor controller; A charge and discharge interface (40), used for connecting to an external circuit and for realizing charge and discharge between the external circuit and the battery; The switch module (50) is used to control the on / off of the electrical connection between the voltage conversion module and the charge / discharge interface.

2. The charge and discharge control circuit according to claim 1, wherein: When the voltage of the external circuit does not match the voltage of the battery (20), the switch module (50) controls the electrical connection between the charge and discharge interface (40) and the voltage conversion module (30) to be turned on, so that the voltage conversion module (30) converts the voltage output by the external circuit into a first target voltage to perform boost charging or buck charging on the battery (20), or converts the voltage output by the battery (20) into a second target voltage to perform boost discharge or buck discharge on the external circuit.

3. The charge and discharge control circuit according to claim 1 or 2, characterized in that: The switch module (50) comprises: The first switch unit (501) is connected between the voltage conversion module (30) and the charge-discharge interface (40) and is used to control the on / off of the electrical connection between the charge-discharge interface (40) and the voltage conversion module (30).

4. The charge and discharge control circuit according to claim 3, characterized in that: The switch module (50) further comprises: The second switch unit (502) is connected between the voltage conversion module (30) and the battery (20) and is used to control the on / off of the electrical connection between the battery and the voltage conversion module (30).

5. The charge and discharge control circuit according to claim 4, characterized in that: The switch module (50) further comprises: The third switch unit (503) is connected between the charge and discharge interface (40) and the battery (20) and is used to control the on and off of the electrical connection between the charge and discharge interface (40) and the battery (20).

6. The charge and discharge control circuit according to claim 5, characterized in that: The voltage conversion module includes: A first phase bridge arm includes a first switching element (Q1) and a second switching element (Q2) connected in series; A second phase bridge arm includes a third switching element (Q3) and a fourth switching element (Q4) connected in series; A first inductor element (L1) is connected between a connection node between the first switch element (Q1) and the second switch element (Q2) and a first end (A) of the voltage conversion module (30); a second inductor element (L2) connected between a connection node between the third switch element (Q3) and the fourth switch element (Q4) and the first terminal (A) of the voltage conversion module; The first switching element (Q1) and the third switching element (Q3) are connected to the second end (B) of the voltage conversion module, and the second switching element (Q2) and the fourth switching element (Q4) are connected to the third end (C) of the voltage conversion module.

7. The charge and discharge control circuit according to claim 6, characterized in that: When the electrical connection between the charge and discharge interface (40) and the voltage conversion module (30) is conducted, in a first period, the first switch element (Q1) and the third switch element (Q3) are conducted, and the second switch element (Q2) and the fourth switch element (Q4) are turned off; in a second period, the second switch element (Q2) and the fourth switch element (Q4) are conducted, and the first switch element (Q1) and the third switch element (Q3) are turned off; The first time period and the second time period are performed alternately to achieve boost charging or buck charging of the battery (20) by the external circuit, or boost discharge or buck discharge of the battery (20) to the external circuit.

8. The charge and discharge control circuit according to claim 6 or 7, Its characteristics are: in, The first switch unit (501) comprises: A first switch (K4) is connected between the second end (B) of the voltage conversion module (30) and the positive end of the charge and discharge interface (40); a second switch (K5) connected between the third terminal (C) of the voltage conversion module (30) and the negative terminal of the charge and discharge interface (40); Wherein, the second switch unit (502) comprises: a third switch (K1) connected between the positive electrode of the battery (20) and the first end (A) of the voltage conversion module (30); a fourth switch (K2) connected between the negative electrode of the battery (20) and the third terminal (C) of the voltage conversion module (30); a fifth switch (K3) connected between the positive electrode of the battery (20) and the second end (B) of the voltage conversion module (30); Wherein, the third switch unit (503) comprises: a sixth switch (K6), connected between the first switch (K1) and the positive terminal of the charge-discharge interface (40); The seventh switch (K7) is connected between the second switch (K2) and the negative terminal of the charge and discharge interface (40).

9. The charge and discharge control circuit according to claim 8, characterized in that: When the charging and discharging interface (40) is electrically connected to the external circuit: The fourth switch (K2), the fifth switch (K3), the sixth switch (K6), and the seventh switch (K7) are closed, so that the battery (20), the fifth switch (K3), the voltage conversion module (30), the sixth switch (K6), the charge and discharge interface (40), the seventh switch (K7), and the fourth switch (K2) are connected to form a charge and discharge loop between the battery (20) and the external circuit; or The third switch (K1), the fourth switch (K2), the first switch (K4), and the second switch (K5) are closed, so that the battery (20), the first switch (K1), the voltage conversion module (30), the first switch (K4), the charge and discharge interface (40), the second switch (K5), and the fourth switch (K2) are connected to form a charge and discharge loop between the battery (20) and the external circuit.

10. The charge and discharge control circuit according to claim 9, characterized in that: When the external circuit charges the battery through the charge and discharge interface, the switch module (50) is configured to: In a first charging stage, the third switch (K1), the fourth switch (K2), the first switch (K4), and the second switch (K5) are closed, and the first switch element (Q1) and the third switch element (Q3) are turned on to form a first charging circuit for the battery (20); In the second charging stage, the third switch (K1) and the fourth switch (K2) are closed, and the second switch element (Q2) and the fourth switch element (Q4) are turned on to form a second charging circuit for the battery (20); The first charging stage and the second charging stage are performed alternately, so that the external circuit alternately performs voltage reduction charging on the battery (20) through the first charging circuit and the second charging circuit.

11. The charge and discharge control circuit according to claim 9, wherein: When the external circuit charges the battery through the charge and discharge interface, the switch module (50) is configured to: In the third charging stage, the sixth switch (K6) and the seventh switch (K7) are closed, and the second switch element (Q2) and the fourth switch element (Q4) are turned on to form a third charging loop; In the fourth charging stage, the fourth switch (K2), the fifth switch (K3), the sixth switch (K6), and the seventh switch (K7) are closed, and the first switch element (Q1) and the third switch element (Q3) are turned on to form a fourth charging loop; The third charging stage and the fourth charging stage are performed alternately, so that the external circuit can alternately boost and charge the battery (20) through the third charging circuit and the fourth charging circuit.

12. The charge and discharge control circuit according to claim 9, wherein: When the battery discharges to the external circuit through the charge and discharge interface, the switch module (50) is configured to: In the first discharging stage, the third switch (K1) and the fourth switch (K2) are closed, and the second switch element (Q2) and the fourth switch element (Q4) are turned on to form a first discharging loop; In the second discharging stage, the third switch (K1), the fourth switch (K2), the first switch (K4), and the second switch (K5) are closed, and the first switch element (Q1) and the third switch element (Q3) are turned on to form a second discharging loop; The first discharge stage and the second discharge stage are performed alternately to enable the battery (20) to perform boost discharge alternately to the external circuit through the first discharge circuit and the second discharge circuit.

13. The charge and discharge control circuit according to claim 9, wherein: When the battery discharges to the external circuit through the charge and discharge interface (40), the switch module (50) is configured as follows: In the third discharging stage, the fourth switch (K2), the fifth switch (K3), the sixth switch (K6), and the seventh switch (K7) are closed, and the first switching element (Q1) and the third switching element (Q3) are turned on to form a third discharging loop; In the fourth discharging stage, the sixth switch (K6) and the seventh switch (K7) are closed, and the second switch element (Q2) and the fourth switch element (Q4) are turned on to form a fourth discharging loop; The third discharge stage and the fourth discharge stage are performed alternately to enable the battery (20) to perform voltage reduction discharge alternately to the external circuit through the third discharge circuit and the fourth discharge circuit.

14. The charge and discharge control circuit according to claim 8, characterized in that: When the charge and discharge interface (40) is not electrically connected to the external circuit, the third switch (K1) and the fourth switch (K2) are closed, so that the battery (20), the third switch (K1), the voltage conversion module (30), the motor controller (101), and the fourth switch (K2) are connected, forming an energy transmission path between the battery (20) and the motor controller (101).

15. A charge and discharge control method, characterized in that: The charge and discharge control circuit according to any one of claims 1 to 14 comprises: When the external circuit is electrically connected to the charge and discharge interface (40), the switch module (50) controls the electrical connection between the voltage conversion module (30) and the charge and discharge interface (40) to form a charge and discharge loop between the battery (20) and the external circuit.

16. An electrical device, characterized in that: Comprising the charge and discharge control circuit according to any one of claims 1 to 14.

17. A vehicle, characterized in that: Comprising the electrical device of claim 16.

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