Voltage conversion circuit, charging and discharging system, charging and discharging method, charging and discharging equipment, charging and discharging system and vehicle

Abstract

The invention discloses a voltage conversion circuit, a charging and discharging system, a charging and discharging method, charging and discharging equipment, a charging and discharging system and a vehicle. The capacitor circuit is connected in parallel with the first switch circuit; a first end and a second end of the first switching circuit are respectively used for connecting a positive electrode and a negative electrode of a first battery; the first switching circuit comprises a first switching tube and a second switching tube which are connected in series; a first end of the inductive circuit is connected with a connection node between the first switch tube and the second switch tube; and the second end of the inductance circuit and the second end of the first switching circuit are respectively used for connecting the positive electrode and the negative electrode of a second battery. According to the technical scheme, the different battery characteristics of the first battery and the second battery are combined, large-capacity continuous power supply and high-power power supply are met, the large-power requirement can be met without configuring a large number of first batteries or second batteries, and therefore the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of voltage conversion technology, and in particular to a voltage conversion circuit, a charging and discharging system, a method, a device, a system and a vehicle. Background Art

[0002] Existing electric vehicles generally have batteries with higher capacity, but they cannot withstand higher charge and discharge currents, that is, they cannot be compatible with the characteristics of large capacity and high power. Therefore, models that pursue extreme performance need to be equipped with a large number of batteries to meet high power requirements, thereby increasing the cost of the entire vehicle. Therefore, how to ensure that the battery meets the requirements of large capacity, high power and low cost has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] Embodiments of the present invention provide a voltage conversion circuit, a charging and discharging system, a method, a device, a system and a vehicle to solve the problem that the battery on the vehicle cannot meet the requirements of large capacity, high power and low cost.

[0004] A voltage conversion circuit comprises a first switch circuit, a capacitor circuit and an inductor circuit; The capacitor circuit is connected in parallel with the first switch circuit; The first end of the first switch circuit is used to connect the positive electrode of the first battery, and the second end of the first switch circuit is used to connect the negative electrode of the first battery; the first switch circuit includes a first switch tube and a second switch tube arranged in series; The first end of the inductor circuit is connected to a connection node between the first switch tube and the second switch tube; The second end of the inductor circuit is used to connect to the positive electrode of the second battery, and the second end of the first switch circuit is used to connect to the negative electrode of the second battery.

[0005] Furthermore, it also includes a second switch circuit; the first end of the second switch circuit is connected to the second end of the inductor circuit, and the second end of the second switch circuit is used to connect to the positive electrode of the second battery.

[0006] A charging and discharging system comprises a first battery, a second battery and the above-mentioned voltage conversion circuit; The positive electrode of the first battery is connected to the first end of the first switch circuit and the first end of the capacitor circuit, and the negative electrode of the first battery is connected to the second end of the first switch circuit and the second end of the capacitor circuit; The positive electrode of the second battery is connected to the second end of the inductor circuit, and the negative electrode of the second battery is connected to the second end of the first switch circuit and the second end of the capacitor circuit.

[0007] Furthermore, the first battery and the second battery have different battery parameters.

[0008] Furthermore, the capacity of the first battery is greater than the capacity of the second battery, and the output power of the first battery is less than the output power of the second battery.

[0009] A control method for a charging and discharging system, wherein the charging and discharging system is the above-mentioned charging and discharging system, and the control method comprises: Obtaining a system control request, where the system control request includes a control type; If the control type is discharge control, the first switch tube is controlled to be turned off, and the second switch tube is controlled to be turned on, so that the first battery and the second battery are connected in parallel and discharged jointly; If the control type is charging control, the first switch tube is controlled to be turned on, and the second switch tube is controlled to be turned off, so that the first battery charges the second battery.

[0010] Furthermore, if the control type is discharge control, controlling the first switch tube to be turned off and controlling the second switch tube to be turned on includes: Acquire first measured data, and determine a first duty cycle according to the first measured data; According to the first duty cycle, the second switch tube is controlled to be turned on, so as to control the inductor circuit and the capacitor circuit to keep the output voltage of the second battery the same as the output voltage of the first battery.

[0011] Further, if the control type is charging control, controlling the first switch tube to be turned on and controlling the second switch tube to be turned off includes: Acquire second measured data, and determine a second duty cycle according to the second measured data; According to the second duty cycle, the first switch tube is controlled to be turned on to control the charging voltage and / or charging current of the second battery.

[0012] A control device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method of the charging and discharging system when executing the computer program.

[0013] A whole vehicle system, comprising the above-mentioned charging and discharging system, the above-mentioned control device and a motor controller; The motor controller is connected to the charging and discharging system and is used to connect the motor; The control device is connected to the charging and discharging system and is used to control the operation of the charging and discharging system.

[0014] A vehicle comprises the above-mentioned whole vehicle system.

[0015] Further, the first battery and the control device are integrated into a first battery pack; the second battery and the voltage conversion circuit are integrated into a second battery pack; The first battery pack is disposed under a floor of the vehicle, and the second battery pack is disposed under a seat of the vehicle.

[0016] The above-mentioned voltage conversion circuit, charging and discharging system, method, equipment, system and vehicle, by connecting the capacitor circuit in parallel with the first switch circuit, the first end of the first switch circuit is used to connect the positive electrode of the first battery, and the second end of the first switch circuit is used to connect the negative electrode of the first battery; the first switch circuit includes a first switch tube and a second switch tube arranged in series; the first end of the inductor circuit is connected to the connection node between the first switch tube and the second switch tube; the second end of the inductor circuit is used to connect the positive electrode of the second battery, and the second end of the first switch circuit is used to connect the negative electrode of the second battery, so that the output power of the second battery can be adjusted by controlling the switching action of the first switch tube and the second switch tube, using the inductor circuit and the capacitor circuit, so that the first battery and the second battery can jointly output power, combined with the different battery characteristics of the first battery and the second battery, to meet large-capacity continuous power supply and high-power power supply, so that there is no need to configure a large number of first batteries or second batteries to meet high power requirements, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0018] Figure 1 is a circuit diagram of a voltage conversion circuit in one embodiment of the present invention; Figure 2 is a schematic diagram of a vehicle in one embodiment of the present invention; Figure 3 is a flow chart of a control method of a charging and discharging system in one embodiment of the present invention; Figure 4 is another flow chart of a control method of a charging and discharging system in one embodiment of the present invention; Figure 5 is another flow chart of a control method for a charging and discharging system in one embodiment of the present invention.

[0019] In the figure: 1. charging and discharging system; 11. first battery; 12. second battery; 13. voltage conversion circuit; 131. first switching circuit; 132. capacitor circuit; 133. inductor circuit; 134. second switching circuit; 2. control device; 3. motor controller; 4. motor; 5. first battery pack; 6. second battery pack. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0022] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "a", "an" and " / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0023] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0024] The present embodiment provides a voltage conversion circuit 13. The voltage conversion circuit 13 is applied in a charging and discharging system 1. Exemplarily, the charging and discharging system 1 includes a first battery 11, a second battery 12 and the voltage conversion circuit 13. The voltage conversion circuit 13 is connected to the first battery 11 and the second battery 12, and is used to connect a load device. As an example, the voltage conversion circuit 13 can be applied in a vehicle. The first battery 11 and the second battery 12 are different batteries. Exemplarily, the battery parameters of the first battery 11 and the second battery 12 are different. The capacity of the first battery 11 is greater than the capacity of the second battery 12, and the output power of the first battery 11 is less than the output power of the second battery 12. For example, the first battery 11 is a capacity-type battery, and the second battery 12 is a power-type battery. The load device may be a motor controller 3 in a vehicle; the motor controller 3 is used to connect the motor 4. In this embodiment, the voltage conversion circuit 13 is combined with the large capacity characteristics of the first battery 11 and the high power characteristics of the second battery 12 to simultaneously meet the large-capacity continuous power supply and high-power power supply requirements, so that the high power demand can be met without configuring a large number of first batteries 11 or second batteries 12, thereby reducing the cost of the entire vehicle.

[0025] This embodiment provides a voltage conversion circuit 13, including a first switch circuit 131, a capacitor circuit 132 and an inductor circuit 133; the capacitor circuit 132 is connected in parallel with the first switch circuit 131; the first end of the first switch circuit 131 is used to connect the positive electrode of the first battery 11, and the second end of the first switch circuit 131 is used to connect the negative electrode of the first battery 11; the first switch circuit 131 includes a first switch tube S1 and a second switch tube S2 arranged in series; the first end of the inductor circuit 133 is connected to the connection node between the first switch tube S1 and the second switch tube S2; the second end of the inductor circuit 133 is used to connect the positive electrode of the second battery 12, and the second end of the first switch circuit 131 is used to connect the negative electrode of the second battery 12.

[0026] The first switch tube S1 and the second switch tube S2 may be bipolar transistors or field effect transistors.

[0027] As an example, the emitter or source of the first switch tube S1 is the second end of the first switch circuit 131, the collector or drain of the first switch tube S1 is connected to the emitter or source of the second switch tube S2, and the collector or drain of the second switch tube S2 is the first end of the first switch circuit 131. The base or gate of the first switch tube S1 and the base or gate of the second switch tube S2 are the control ends of the first switch circuit 131, which are used to connect the control device 2.

[0028] As an example, the capacitor circuit 132 is connected in parallel with the first switch circuit 131 for connecting to the motor controller 3 in the vehicle.

[0029] Exemplarily, when the vehicle starts and the user needs greater power, the first battery 11 charges the capacitor circuit 132 and provides an output voltage to the motor controller 3 through the capacitor circuit 132. At the same time, the second switch tube S2 is turned off. At this time, the second switch tube S2 is equivalent to a unidirectional conducting diode. The first switch tube S1 is turned on according to the preset switching frequency, so that the second battery 12 charges the inductor circuit 133. The electrical energy of the second battery 12 is converted into magnetic energy and stored in the inductor circuit 133. The voltage of the second battery 12 is pumped up by the energy storage effect of the inductor circuit 133. The voltage of the second battery 12 is boosted by the voltage stabilizing effect of the capacitor circuit 132 to adjust the output power of the second battery 12 and keep the output voltage of the second battery 12 the same as the output voltage of the first battery 11. For example, the output voltage of the second battery 12 is kept the same as the output voltage of the first battery 11 to prevent the voltage of the first battery 11 from flowing back into the second battery 12, so that the first battery 11 and the second battery 12 can be connected in parallel to jointly output power to meet large-capacity continuous power supply and high-power power supply.

[0030] Exemplarily, when the power of the second battery 12 is low, the second switch tube S2 is turned on according to the preset switching frequency, the first switch tube S1 is turned off, and the motor controller 3 recovers the energy of the motor 4, thereby charging the second battery 12 through the recovered energy of the motor 4 and / or the first battery 11, thereby improving energy utilization.

[0031] In this embodiment, by connecting the capacitor circuit 132 in parallel with the first switch circuit 131, the first end and the second end of the first switch circuit 131 are respectively used to connect the positive electrode and the negative electrode of the first battery 11; the first switch circuit 131 includes a first switch tube S1 and a second switch tube S2 arranged in series; the first end of the inductor circuit 133 is connected to the connection node between the first switch tube S1 and the second switch tube S2; the second end of the inductor circuit 133 and the second end of the first switch circuit 131 are respectively used to connect the positive electrode and the negative electrode of the second battery 12, so that the output power of the second battery 12 can be adjusted by controlling the switching action of the first switch tube S1 and the second switch tube S2, so that the first battery 11 and the second battery 12 can jointly output power, and combined with the different battery characteristics of the first battery 11 and the second battery 12, large-capacity continuous power supply and high-power power supply are met, so that the high power demand can be met without configuring a large number of first batteries 11 or second batteries 12, thereby reducing costs.

[0032] In one embodiment, a second switch circuit 134 is further included; a first end of the second switch circuit 134 is connected to a second end of the inductor circuit 133 , and a second end of the second switch circuit 134 is used to connect to the positive electrode of the second battery 12 .

[0033] The second switch circuit 134 includes a relay or a contactor (eg Figure 1 K1 in ).

[0034] As an example, when the vehicle starts and the user needs more power, the second switch circuit 134 is turned on, so that the second battery 12 is connected to the inductor circuit 133. When the second switch tube S2 is turned off and the first switch tube S1 is turned on according to the preset switching frequency, the output voltage of the second battery 12 can be boosted through the inductor circuit 133 and the capacitor circuit 132. When the vehicle starts and the user does not need more power, the second switch circuit 134 is turned off, the second battery 12 and the inductor circuit 133 are disconnected, and the voltage is provided to the motor 4 control module only through the first battery 11.

[0035] In this embodiment, the first end of the second switch circuit 134 is connected to the second end of the inductor circuit 133, and the second end of the second switch circuit 134 is used to connect to the positive electrode of the second battery 12. The second switch circuit 134 can flexibly select whether to connect to the second battery 12.

[0036] As an example, the inductance circuit 133 includes an inductor L1 , and the capacitance circuit 132 includes a capacitor C1 . The inductance value of the inductor L1 and the capacitance value of the capacitor C1 can be configured according to actual experience and needs, and are not limited here.

[0037] The present embodiment provides a charging and discharging system 1, comprising a first battery 11, a second battery 12 and the above-mentioned voltage conversion circuit 13; the positive electrode of the first battery 11 is connected to the first end of the first switch circuit 131 and the first end of the capacitor circuit 132, and the negative electrode of the first battery 11 is connected to the second end of the first switch circuit 131 and the second end of the capacitor circuit 132; the positive electrode of the second battery 12 is connected to the second end of the inductor circuit 133, and the negative electrode of the second battery 12 is connected to the second end of the first switch circuit 131 and the second end of the capacitor circuit 132.

[0038] In this embodiment, by controlling the switching actions of the first switch tube S1 and the second switch tube S2 in the voltage conversion circuit 13, the inductor circuit 133 and the capacitor circuit 132 are used to boost the voltage of the second battery 12, so that the first battery 11 and the second battery 12 can jointly output power. Combining the different battery characteristics of the first battery 11 and the second battery 12, the charging and discharging system 1 can meet the requirements of large-capacity continuous power supply and high-power power supply, so that the high power demand can be met without configuring a large number of first batteries 11 or second batteries 12, thereby reducing the cost of the charging and discharging system 1.

[0039] In one embodiment, the first battery 11 and the second battery 12 have different battery parameters.

[0040] In this embodiment, the battery parameters of the first battery 11 and the second battery 12 are different, so that the charging and discharging system 1 can take into account the characteristics of high capacity and high power.

[0041] In one embodiment, the capacity of the first battery 11 is greater than the capacity of the second battery 12, and the output power of the first battery 11 is less than the output power of the second battery 12. In this embodiment, the capacity of the first battery 11 is greater than the capacity of the second battery 12, and the output power of the first battery 11 is less than the output power of the second battery 12, that is, the first battery 11 is a capacity-type battery with large capacity and high output voltage, and the second battery 12 is a power-type battery with large output power, so that the charging and discharging system 1 meets the characteristics of large-capacity continuous power supply and high power.

[0042] This embodiment provides a control method for a charging and discharging system 1, such as Figure 3 As shown, the charging and discharging system 1 is the above-mentioned charging and discharging system 1, and the control method includes: S301: Obtain a system control request, where the system control request includes a control type.

[0043] S302: If the control type is discharge control, the first switch tube S1 is controlled to be turned off, and the second switch tube S2 is controlled to be turned on, so that the first battery 11 and the second battery 12 are connected in parallel and discharged jointly.

[0044] S303 : If the control type is charging control, the first switch tube S1 is controlled to be turned on, and the second switch tube S2 is controlled to be turned off, so that the first battery 11 charges the second battery 12 .

[0045] The system control request is a request for controlling the charge-discharge system 1. The control type includes discharge control and charge control. Discharge control refers to controlling the discharge of the first battery 11 and / or the second battery 12. Charge control refers to controlling the charge of the second battery 12.

[0046] As an example, in step S301, the system control request may be a request output by a control device 2 in the vehicle. Exemplarily, the control device 2 may be a battery management controller.

[0047] As an example, in step S302, if the control type is discharge control, the first switch tube S1 is controlled to be turned off, and the second switch tube S2 is controlled to be turned on, so that the first battery 11 and the second battery 12 are connected in parallel and jointly discharged. In this embodiment, when the first switch tube S1 is turned off, the second switch tube S2 is controlled to be turned on, the first battery 11 first charges the capacitor circuit 132, and outputs a voltage to the motor 4 controller through the capacitor circuit 132, and the second battery 12 first charges the inductor circuit 133, and the output voltage of the second battery 12 is boosted through the inductor circuit 133, so that the output voltage of the second battery 12 is the same as the output voltage of the first battery 11, and the capacitor circuit 132 is used to stabilize the voltage, so that the first battery 11 and the second battery 12 are connected in parallel and jointly discharged.

[0048] As an example, in step S303, if the control type is discharge control, the first switch tube S1 is controlled to be turned off, and the second switch tube S2 is controlled to be turned on, so that the first battery 11 and the second battery 12 are connected in parallel and discharged together. In this embodiment, when the first switch tube S1 is turned on, the second switch tube S2 is controlled to be turned off, and the first battery 11 is used to charge the second battery 12, so that when the vehicle needs higher power, the second battery 12 has enough power to provide a high voltage through the inductance circuit 133 and the capacitance circuit 132 to improve the power external characteristics of the motor 4. It can be understood that the second battery 12 can also be charged by recovering the energy of the motor 4 through the motor controller 3.

[0049] In this embodiment, by obtaining a system control request, the system control request includes a control type. If the control type is discharge control, the first switch tube S1 is controlled to be turned off, and the second switch tube S2 is controlled to be turned on, so that the first battery 11 and the second battery 12 are connected in parallel and jointly discharged. If the control type is charging control, the first switch tube S1 is controlled to be turned on, and the second switch tube S2 is controlled to be turned off, so that the first battery 11 charges the second battery 12, so that the voltage conversion circuit 13 is used to realize the charging and discharging of the first battery 11 and the second battery 12. When a larger power output is required, the first battery 11 and the second battery 12 are connected in parallel and jointly discharged, so that the charging and discharging system 1 is compatible with large-capacity continuous power supply and high-power power supply.

[0050] In one embodiment, in step S302, Figure 4 As shown, if the control type is discharge control, the first switch tube S1 is controlled to be turned off, and the second switch tube S2 is controlled to be turned on, including: S401: Acquire first measured data, and determine a first duty cycle according to the first measured data.

[0051] S402 : According to the first duty cycle, the second switch tube S2 is controlled to be turned on, so as to control the inductor circuit 133 and the capacitor circuit 132 to keep the output voltage of the second battery 12 the same as the output voltage of the first battery 11 .

[0052] The first measured data refers to data detected in real time from the charge and discharge system 1. The first measured data includes the output voltage of the first battery 11 and the output voltage of the second battery 12. The first duty cycle refers to the duty cycle of the electrical signal used to control the conduction of the second switch tube S2. It can be understood that the electrical signal is a PWM signal.

[0053] As an example, in step S401, first measured data is obtained, and a first duty cycle is determined according to the first measured data. Exemplarily, according to the following formula: ; ; Wherein, Vi is the output voltage of the second battery 12, Vout is the output voltage of the first battery 11, D is the first duty cycle, and T is the period of the electrical signal used to control the conduction of the second switch tube S2. L is the inductance value of the inductor circuit 133. Therefore, by obtaining the output voltage of the first battery 11 and the output voltage of the second battery 12, the first duty cycle can be adjusted in real time to keep the output voltage of the second battery 12 the same as the output voltage of the first battery 11.

[0054] As an example, in step S402, according to the first duty cycle, the second switch tube S2 is controlled to be turned on to control the inductor circuit 133 and the capacitor circuit 132 to keep the output voltage of the second battery 12 the same as the output voltage of the first battery 11, thereby preventing the voltage of the first battery 11 from flowing back to the second battery 12.

[0055] In this embodiment, first measured data is obtained, a first duty cycle is determined according to the first measured data, and according to the first duty cycle, the second switch tube S2 is controlled to be turned on, so as to control the inductor circuit 133 and the capacitor circuit 132 to keep the output voltage of the second battery 12 the same as the output voltage of the first battery 11, so as to ensure that the first battery 11 and the second battery 12 can output power at the same time, prevent the voltage of the first battery 11 from flowing back to the second battery 12, and make the charging and discharging system 1 compatible with large-capacity continuous power supply and high-power power supply.

[0056] In one embodiment, in step S303, Figure 5 As shown, if the control type is charging control, the first switch tube S1 is controlled to be turned on, and the second switch tube S2 is controlled to be turned off, including: S501: Acquire second measured data, and determine a second duty cycle according to the second measured data.

[0057] S502 : According to the second duty cycle, the first switch tube S1 is controlled to be turned on to control the charging voltage and / or charging current of the second battery 12 .

[0058] The second measured data refers to data detected in real time from the charge and discharge system 1. The second measured data includes the output voltage of the second battery 12, the power of the second battery 12, and the temperature of the second battery 12. The first duty cycle refers to the duty cycle of the electrical signal used to control the conduction of the first switch tube S1. It can be understood that the electrical signal is a PWM signal.

[0059] In this embodiment, second measured data is obtained, and a second duty cycle is determined according to the second measured data. According to the second duty cycle, the first switch tube S1 is controlled to be turned on, and the charging voltage and / or charging current of the second battery 12 is controlled. The second duty cycle of controlling the conduction of the first switch tube S1 is adjusted in real time through the second measured data to control the charging voltage and / or charging current of the second battery 12, so as to ensure the safety of the second battery 12.

[0060] This embodiment provides a control device 2, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the control method of the charging and discharging system 1 is implemented.

[0061] This embodiment provides a whole vehicle system, including the above-mentioned charging and discharging system 1, the above-mentioned control device 2 and the motor controller 3; the motor controller 3 is connected to the charging and discharging system 1 and is used to connect the motor 4; the control device 2 is connected to the charging and discharging system 1 and is used to control the operation of the charging and discharging system 1.

[0062] As an example, the motor controller 3 includes a plurality of bridge arms, and the midpoints of the plurality of bridge arms are used to connect the motor 4. The plurality of bridge arms are connected to both ends of the capacitor circuit 132 of the charging and discharging system 1. It can be understood that the motor controller 3 can be controlled by an onboard controller in the vehicle.

[0063] In this embodiment, the whole vehicle system includes the above-mentioned charging and discharging system 1, the above-mentioned control device 2 and the motor controller 3; the motor controller 3 is connected to the charging and discharging system 1 and is used to connect the motor 4; the control device 2 is connected to the charging and discharging system 1 and is used to control the operation of the charging and discharging system 1. The charging and discharging system 1 takes into account the characteristics of large capacity and high power, provides a high voltage to enhance the power characteristics of the motor 4, and at the same time recovers the energy generated by the motor 4 to charge the second battery 12 of the charging and discharging system 1, thereby improving energy utilization.

[0064] This embodiment provides a vehicle, including the above-mentioned vehicle system.

[0065] In one embodiment, the first battery 11 and the control device 2 are integrated into a first battery pack 5; the second battery 12 and the voltage conversion circuit 13 are integrated into a second battery pack 6; the first battery pack 5 is arranged under the floor of the vehicle, and the second battery pack 6 is arranged under the seat of the vehicle.

[0066] The control device 2 is a battery management controller.

[0067] In this embodiment, the first battery 11 and the control device 2 are integrated into a first battery pack 5; the second battery 12 and the voltage conversion circuit 13 are integrated into a second battery pack 6; the first battery pack 5 is arranged under the floor of the vehicle, and the second battery pack 6 is arranged under the seat of the vehicle, thereby saving the space layout of the entire vehicle while making the battery of the entire vehicle compatible with the characteristics of large capacity and high power, thereby reducing the cost of the entire vehicle.

[0068] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A voltage conversion circuit, characterized in that: comprising a first switch circuit, a capacitor circuit and an inductor circuit; The capacitor circuit is connected in parallel with the first switch circuit; The first end of the first switch circuit is used to connect the positive electrode of the first battery, and the second end of the first switch circuit is used to connect the negative electrode of the first battery; the first switch circuit includes a first switch tube and a second switch tube arranged in series; The first end of the inductor circuit is connected to a connection node between the first switch tube and the second switch tube; The second end of the inductor circuit is used to connect to the positive electrode of the second battery, and the second end of the first switch circuit is used to connect to the negative electrode of the second battery.

2. The voltage conversion circuit according to claim 1, characterized in that: It also includes a second switch circuit; the first end of the second switch circuit is connected to the second end of the inductor circuit, and the second end of the second switch circuit is used to connect to the positive electrode of the second battery.

3. A charging and discharging system, characterized in that: comprising a first battery, a second battery and a voltage conversion circuit as claimed in any one of claims 1 to 2; The positive electrode of the first battery is connected to the first end of the first switch circuit and the first end of the capacitor circuit, and the negative electrode of the first battery is connected to the second end of the first switch circuit and the second end of the capacitor circuit; The positive electrode of the second battery is connected to the second end of the inductor circuit, and the negative electrode of the second battery is connected to the second end of the first switch circuit and the second end of the capacitor circuit.

4. The charging and discharging system according to claim 3, characterized in that: The first battery and the second battery have different battery parameters.

5. The charging and discharging system according to claim 4, characterized in that: The capacity of the first battery is greater than that of the second battery, and the output power of the first battery is less than the output power of the second battery.

6. A control method for a charging and discharging system, characterized in that: The charging and discharging system is the charging and discharging system according to any one of claims 3 to 5, and the control method comprises: Obtaining a system control request, wherein the system control request includes a control type; If the control type is discharge control, the first switch tube is controlled to be turned off, and the second switch tube is controlled to be turned on, so that the first battery and the second battery are connected in parallel and discharged jointly; If the control type is charging control, the first switch tube is controlled to be turned on, and the second switch tube is controlled to be turned off, so that the first battery charges the second battery.

7. The control method of the charge-discharge system according to claim 6, characterized in that: If the control type is discharge control, controlling the first switch tube to be turned off and controlling the second switch tube to be turned on includes: Acquire first measured data, and determine a first duty cycle according to the first measured data; According to the first duty cycle, the second switch tube is controlled to be turned on, so as to control the inductor circuit and the capacitor circuit to keep the output voltage of the second battery the same as the output voltage of the first battery.

8. The control method of the charge-discharge system according to claim 6, characterized in that: If the control type is charging control, controlling the first switch tube to be turned on and controlling the second switch tube to be turned off includes: Acquire second measured data, and determine a second duty cycle according to the second measured data; According to the second duty cycle, the first switch tube is controlled to be turned on to control the charging voltage and / or charging current of the second battery.

9. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the control method of the charging and discharging system according to any one of claims 6 to 8 is implemented.

10. A vehicle system, characterized in that: Comprising the charging and discharging system according to any one of claims 3 to 5, the control device and the motor controller according to claim 9; The motor controller is connected to the charging and discharging system and is used to connect the motor; The control device is connected to the charging and discharging system and is used to control the operation of the charging and discharging system.

11. A vehicle, characterized in that: Comprising the whole vehicle system as claimed in claim 10.

12. The vehicle according to claim 11, characterized in that The first battery and the control device are integrated into a first battery pack; the second battery and the voltage conversion circuit are integrated into a second battery pack; The first battery pack is disposed under a floor of the vehicle, and the second battery pack is disposed under a seat of the vehicle.

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