V2V circuit, V2V system and vehicle

Abstract

The utility model relates to a V2V circuit, a V2V system and a vehicle. The V2V circuit comprises an input end, an electric drive system and an output end which are connected in sequence, the input end is used for receiving input voltage of a first power battery of a first vehicle, and the output end is used for outputting voltage-regulated output voltage to a second power battery of a second vehicle; the electric drive system comprises a bridge arm circuit and an inductance circuit, the inductance circuit comprises a first inductor and at least two second inductors connected with the first inductor, and the bridge arm circuit comprises a first bridge arm connected with the first inductor and at least two second bridge arms correspondingly connected with the at least two second inductors; any second bridge arm and the first bridge arm form a voltage regulating circuit, and the voltage regulating circuit is used for regulating the input voltage to obtain the regulated output voltage. According to the scheme provided by the invention, the first vehicle can directly charge the second vehicle, so that emergency rescue of the second vehicle when the electric quantity is used up is facilitated, and the charging experience of a user is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery charging and discharging, and particularly to a V2V circuit, a V2V system, and a vehicle. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as the power source, and they are of great significance for promoting the sustainable development of the vehicle industry.

[0003] In related technologies, problems such as the new energy vehicle running out of power and breaking down on the road due to mileage or untimely charging occur frequently. In such cases, generally, only rescue can be called, and then the rescue arranges a tow truck to move the vehicle with depleted power to the charging pile for charging. However, this takes a particularly long time, and the long waiting is undoubtedly a torment for users, thus affecting the user's charging experience. Utility Model Content

[0004] To solve or partially solve the problems existing in related technologies, this application provides a V2V circuit, a V2V system, and a vehicle, which can achieve direct charging of the second vehicle by the first vehicle, so as to facilitate emergency rescue when the second vehicle runs out of power, thereby improving the user's charging experience.

[0005] In the first aspect of this application, a V2V circuit is provided, including: an input end, an electric drive system, and an output end connected in sequence, where the input end is used to receive the input voltage of the first power battery of the first vehicle, and the output end is used to output the regulated output voltage to the second power battery of the second vehicle;

[0006] The electric drive system includes a bridge arm circuit and an inductance circuit. The inductance circuit includes a first inductor and at least two second inductors connected to the first inductor. The bridge arm circuit includes a first bridge arm connected to the first inductor and at least two second bridge arms respectively connected to at least two of the second inductors;

[0007] Any one of the second bridge arms and the first bridge arm form a voltage regulation circuit, and the voltage regulation circuit is used to regulate the input voltage to obtain the regulated output voltage.

[0008] In an embodiment, there are at least two groups of the voltage regulation circuits; where

[0009] A first switch combination formed by at least two groups of the voltage regulation circuits and the inductance circuit form a buck circuit, and the buck circuit is used to step down the input voltage to obtain a stepped-down output voltage when the input voltage is greater than the voltage of the second power battery;

[0010] A boost circuit is formed by a second switch combination composed of at least two of the voltage regulating circuits and the inductor circuit. The boost circuit is used to boost the input voltage to obtain a boosted output voltage when the input voltage is less than or equal to the voltage of the second power battery.

[0011] In an embodiment, a first diode is provided on the upper arm of the first bridge arm, and a first switch tube is provided on the lower arm of the first bridge arm. A second switch tube is provided on the upper arm of each second bridge arm, and a second diode is provided on the lower arm of each second bridge arm. The first switch combination includes at least two of the second switch tubes and at least two of the second diodes, and the second switch combination includes the first switch tube and the first diode.

[0012] In an embodiment, it further includes: a relay circuit, which includes a first relay, a second relay, a third relay, a fourth relay, and a fifth relay. The first relay is connected in parallel with the second relay. The first end of the first relay is connected to the positive electrode of the first power battery, and the second end of the first relay is respectively connected to at least two of the second switch tubes. The first end of the third relay is connected to the negative electrode of the first power battery, and the second end of the third relay is respectively connected to the first switch tube, at least two of the second diodes, and the output terminal. The first end of the fourth relay is connected to the second end of the first relay, the second end of the fourth relay is connected to the first end of the fifth relay, and the second end of the fifth relay is connected to the output terminal; wherein, the fourth relay is in a normally open state.

[0013] In an embodiment, when the V2V circuit enters the first buck state, the first relay, the third relay, and the fifth relay are closed, the second relay is open, at least two of the second switch tubes are conducting, and at least two of the second diodes are reversely cut off, so that the first power battery charges the inductor circuit and the second power battery;

[0014] When the V2V circuit switches to the second buck state, the fifth relay is closed, the first relay, the second relay, and the third relay are open, at least two of the second switch tubes are open, and at least two of the second diodes are forward conducting, so that the inductor circuit charges the second power battery;

[0015] Among them, the first switch tube is in a normally open state, and the first diode is in a normally conducting state.

[0016] In one embodiment, when the V2V circuit enters the first boost state, the first relay and the third relay are closed, the second relay and the fifth relay are open, the first switching tube is turned on, and the first diode is reversely cut off, so that the first power battery charges the inductor circuit;

[0017] When the V2V circuit switches to the second boost state, the first relay, the third relay, and the fifth relay are closed, the second relay is open, the first switching tube is turned off, and the first diode is forward-conducted, so that the first power battery and the inductor circuit charge the second power battery;

[0018] Among them, at least two of the second switching tubes are in a normally-conducted state, and at least two of the second diodes are in a normally-cut-off state.

[0019] In one embodiment, the output terminal is disposed at the first DC charging port of the first vehicle, and the first DC charging port is connected to the second DC charging port of the second vehicle through a V2V connection device. Among them, the V2V connection device includes a V2V discharge gun, a V2V intelligent controller, and a V2V charging gun. The V2V discharge gun is connected to the first DC charging port, the V2V charging gun is connected to the second DC charging port, and the V2V intelligent controller is used to establish a communication connection between the first vehicle and the second vehicle.

[0020] The second aspect of the present application provides a V2V system, including: a first vehicle and a second vehicle. Among them, the first vehicle is provided with the V2V circuit as described above. The first DC charging port of the V2V circuit is connected to the second DC charging port of the second vehicle. The V2V circuit is used to regulate the input voltage received from the first power battery of the first vehicle and output the regulated output voltage to the second power battery of the second vehicle through the first DC charging port and the second DC charging port.

[0021] In one embodiment, it further includes: a V2V connection device respectively connected to the first DC charging port and the second DC charging port. Among them, the V2V connection device includes a V2V discharge gun, a V2V intelligent controller, and a V2V charging gun. The V2V discharge gun is connected to the first DC charging port, the V2V charging gun is connected to the second DC charging port, and the V2V intelligent controller is used to establish a communication connection between the first vehicle and the second vehicle.

[0022] The third aspect of the present application provides a vehicle, including the V2V circuit as described above.

[0023] The technical solution provided by the present application may include the following beneficial effects:

[0024] An embodiment of the present application provides a V2V circuit, which includes an input end, an electric drive system, and an output end connected in sequence. The input end is used to receive the input voltage of the first power battery of the first vehicle, and the output end is used to output the regulated output voltage to the second power battery of the second vehicle. The electric drive system includes a bridge arm circuit and an inductor circuit. The inductor circuit includes a first inductor and at least two second inductors connected to the first inductor. The bridge arm circuit includes a first bridge arm connected to the first inductor and at least two second bridge arms respectively connected to the at least two second inductors. Any second bridge arm and the first bridge arm form a voltage regulation circuit, and the voltage regulation circuit is used to regulate the input voltage to obtain the regulated output voltage. By means of the V2V circuit, the present application can realize direct charging of the second vehicle by the first vehicle, so as to facilitate emergency rescue when the power of the second vehicle is exhausted, thereby improving the user's charging experience. Further, the present application forms a voltage regulation circuit by reusing the electric drive system of the V2V circuit. The voltage input from the first vehicle to the second vehicle can be regulated through the voltage regulation circuit. The voltage is controllable, simple and efficient, and has a wide voltage regulation range during the whole process, so that V2V output with different voltage requirements can be realized.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0027] Figure 1 is a schematic structural diagram of the V2V circuit shown in the embodiment of the present application;

[0028] Figure 2 is a specific schematic structural diagram of the V2V circuit shown in the embodiment of the present application;

[0029] Figure 3 is a schematic structural diagram of the buck circuit shown in the embodiment of the present application;

[0030] Figure 4 is a schematic structural diagram of the boost circuit shown in the embodiment of the present application;

[0031] Figure 5 is a schematic structural diagram of the basic circuit shown in the embodiment of the present application;

[0032] Figure 6 is a schematic diagram of the current flow direction when the V2V circuit shown in the embodiment of the present application is in the first buck state;

[0033] Figure 7 It is a schematic diagram of the current flow when the V2V circuit shown in the embodiment of the present application is in the second step-down state;

[0034] Figure 8 It is a schematic diagram of the current flow when the V2V circuit shown in the embodiment of the present application is in the first step-up state;

[0035] Figure 9 It is a schematic diagram of the current flow when the V2V circuit shown in the embodiment of the present application is in the second step-up state;

[0036] Figure 10 It is a connection relationship diagram of the first vehicle, the V2V connection device, and the second vehicle shown in the embodiment of the present application;

[0037] Figure 11 It is a schematic structural diagram of the V2V system shown in the embodiment of the present application. Detailed Embodiments

[0038] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0039] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "the", and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0040] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0041] In the related art, problems such as power loss and breakdown of new energy vehicles on the road due to mileage or untimely charging have emerged in an endless stream. In such cases, generally only rescue can be called, and then the rescue arranges a tow truck to move the power-loss vehicle to a charging pile for charging through the tow truck. However, it takes a particularly long time, and the long waiting is undoubtedly a torment for users, thus affecting the user's charging experience.

[0042] In view of the above problems, the embodiment of the present application provides a V2V circuit. By means of the V2V circuit, direct charging of the second vehicle by the first vehicle can be realized, so as to facilitate emergency rescue when the second vehicle runs out of power, thereby improving the user's charging experience. Further, the present application forms a voltage regulating circuit by reusing the electric drive system of the V2V circuit. Through the voltage regulating circuit, the voltage input from the first vehicle to the second vehicle can be adjusted. The voltage is controllable throughout the process, simple and efficient, and has a wide voltage regulation range, so as to realize V2V output with different voltage requirements.

[0043] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0044] Figure 1 It is a schematic structural diagram of the V2V circuit shown in the embodiment of the present application.

[0045] See Figure 1 , the V2V circuit includes: an input end, an electric drive system and an output end connected in sequence, wherein the input end is used to receive the input voltage Vin of the first power battery of the first vehicle, and the output end is used to output the regulated output voltage Vout to the second power battery of the second vehicle.

[0046] Wherein, both the first vehicle and the second vehicle support the V2V (Vehicle to Vehicle) function. Among them, the first vehicle may refer to a normal vehicle for V2V discharging, and the second vehicle may refer to a power-loss vehicle for V2V charging.

[0047] When the second vehicle breaks down due to mileage or untimely charging and runs out of power on the road, the embodiment of the present application can output the power of the first vehicle to the second vehicle through the V2V circuit, so as to facilitate emergency rescue when the second vehicle runs out of power.

[0048] In an embodiment, the electric drive system includes a bridge arm circuit and an inductance circuit. The inductance circuit includes a first inductor and at least two second inductors connected to the first inductor. The bridge arm circuit includes a first bridge arm connected to the first inductor and at least two second bridge arms respectively connected to at least two second inductors.

[0049] Wherein, the number of inductors in the inductance circuit can be determined according to the number of bridge arms in the bridge arm circuit. For example, the number of inductors in the inductance circuit is equal to the number of bridge arms in the bridge arm circuit. AsFigure 1 As shown, the leg circuit is a three-phase leg circuit, that is, the leg circuit includes three legs, and the inductor circuit can include three inductors. Specifically, the three legs are the first leg M1, the second leg M2, and the third leg M3, and the three inductors are the first inductor L1, the second inductor L2, and the third inductor L3. Among them, the first inductor L1 is respectively connected to the second inductor L2 and the third inductor L3. Among them, the first inductor L1 is connected to the midpoint of the first leg M1, that is, the first inductor L1 is connected between the upper leg and the lower leg of the first leg M1. The second inductor L2 is connected to the midpoint of the second leg M2, that is, the second inductor L2 is connected between the upper leg and the lower leg of the second leg M2. The third inductor L3 is connected to the midpoint of the third leg M3, that is, the third inductor L3 is connected between the upper leg and the lower leg of the third leg M3.

[0050] In addition, the V2V circuit further includes a capacitor circuit, such as Figure 1 shown, the capacitor circuit includes a first capacitor C1, and the first capacitor C1 is respectively connected in parallel with the second leg M2 and the third leg M3.

[0051] In an embodiment, any second leg and the first leg form a voltage regulating circuit, and the voltage regulating circuit is used to regulate the input voltage Vin to obtain the regulated output voltage Vout.

[0052] Such as Figure 1 shown, the second leg M2 and the first leg M1 can form a voltage regulating circuit 1, and the second leg M3 and the first leg M1 can form a voltage regulating circuit 2. Both the voltage regulating circuit 1 and the voltage regulating circuit 2 can regulate the input voltage Vin to obtain the regulated output voltage Vout.

[0053] In the embodiment of the present application, the electric drive system of the V2V circuit is reused to form a voltage regulating circuit. Through the voltage regulating circuit, the voltage input from the first vehicle to the second vehicle can be adjusted, that is, the input voltage Vin of the first power battery of the first vehicle is adjusted to obtain the regulated output voltage Vout, and then the regulated output voltage Vout is input to the second power battery of the second vehicle. The voltage is controllable throughout the process, simple and efficient, and has a wide voltage regulation range, so that V2V output with different voltage requirements can be realized.

[0054] Among them, the voltage regulating circuit includes at least two groups. For example Figure 1 the voltage regulating circuit in includes two voltage regulating circuits, namely the voltage regulating circuit 1 and the voltage regulating circuit 2. The voltage regulating circuit 1 and the voltage regulating circuit 2 can jointly share the input current of the first power battery, so as to increase the output current, so as to realize current boosting while stepping down.

[0055] In one embodiment, a first switch combination composed of at least two voltage regulating circuits and an inductor circuit form a buck circuit; a second switch combination composed of at least two voltage regulating circuits and an inductor circuit form a boost circuit.

[0056] Each bridge arm includes switching devices, and the switching devices can be IGBTs (Insulate-Gate Bipolar Transistors), such as Figure 2 As shown, the first bridge arm M1 may include transistor Q1 and transistor Q2, the second bridge arm M2 may include transistor Q3 and transistor Q4, and the second bridge arm M3 may include transistor Q5 and transistor Q6.

[0057] At least two voltage regulating circuits include multiple transistors. Transistors located at a first preset position are selected from the multiple transistors to form a first switch combination, and the first switch combination and the inductor circuit can form a buck circuit. As Figure 1 and Figure 2 shown, the voltage regulating circuit 1 may include transistor Q1 and transistor Q2 of the first bridge arm M1 and transistor Q3 and transistor Q4 of the second bridge arm M2, and the voltage regulating circuit 2 may include transistor Q1 and transistor Q2 of the first bridge arm M1 and transistor Q5 and transistor Q6 of the second bridge arm M3. Therefore, transistors located at the first preset position can be selected from transistor Q1 to transistor Q6 to form a first switch combination, and the first switch combination and the first inductor L1, the second inductor L2, and the second inductor L3 can form a buck circuit.

[0058] At least two voltage regulating circuits include multiple transistors. Transistors located at a second preset position are selected from the multiple transistors to form a second switch combination, and the second switch combination and the inductor circuit can form a boost circuit. As Figure 1 and Figure 2 shown, the voltage regulating circuit 1 may include transistor Q1 and transistor Q2 of the first bridge arm M1 and transistor Q3 and transistor Q4 of the second bridge arm M2, and the voltage regulating circuit 2 may include transistor Q1 and transistor Q2 of the first bridge arm M1 and transistor Q5 and transistor Q6 of the second bridge arm M3. Therefore, transistors located at the second preset position can be selected from transistor Q1 to transistor Q6 to form a second switch combination, and the second switch combination and the first inductor L1, the second inductor L2, and the second inductor L3 can form a boost circuit.

[0059] Generally, the switching devices in the bridge arm circuit are the same. Assuming that the switching devices Q1, Q3, and Q5 need to be turned on simultaneously, taking the switching device as only including one transistor as an example, assuming that the transistor is an NPN type triode. Generally speaking, the base of the NPN type triode receives a control signal to turn on or off the NPN type triode. When the NPN type triode is turned on, the current flows from the collector of the NPN type triode to the emitter. According to Figure 2 the layout of the switching device Q1 in it, it can be inferred that the current flow direction in the switching device Q1 is opposite to that in the switching devices Q3 and Q5. If the current flow directions of the switching devices Q3 and Q5 are correct, the current flow direction of the switching device Q1 with the same structure will be different from the expected current flow direction of the switching device Q1. Therefore, in the embodiment of the present application, the switching device Q1 is used as a diode, and the switching devices Q3 and Q5 are used as switching tubes. Then, a switching tube Q2 is connected to the diode Q1, and diodes Q4 and Q6 are respectively connected to the switching tubes Q3 and Q5.

[0060] It should be noted that the transistors in the embodiment of the present application are not limited to triodes or field effect transistors, and the selection of related devices can be made according to actual needs.

[0061] Based on this, in an embodiment, a first diode is provided on the upper bridge arm of the first bridge arm, a first switching tube is provided on the lower bridge arm of the first bridge arm, a second switching tube is provided on the upper bridge arm of each second bridge arm, and a second diode is provided on the lower bridge arm of each second bridge arm. The first switching combination includes at least two second switching tubes and at least two second diodes, and the second switching combination includes the first switching tube and the first diode.

[0062] As Figure 1 、 Figure 3 and Figure 4 shown, a first diode Q1 is provided on the upper bridge arm of the first bridge arm M1, a first switching tube Q2 is provided on the lower bridge arm of the first bridge arm, a second switching tube Q3 is provided on the upper bridge arm of the second bridge arm M2, a second diode Q4 is provided on the lower bridge arm of the second bridge arm M2, a second switching tube Q5 is provided on the upper bridge arm of the second bridge arm M3, and a second diode Q6 is provided on the lower bridge arm of the second bridge arm M3.

[0063] In an embodiment, the first switching combination includes at least two second switching tubes and at least two second diodes, and the second switching combination includes the first switching tube and the first diode.

[0064] Figure 3 is a schematic structural diagram of a buck circuit. As Figure 3As shown, the first switch combination may include the second switching transistor Q3, the second switching transistor Q5, the second diode Q4, and the second diode Q6 within the dashed box. Therefore, the first switch combination and the first inductor L1, the second inductor L2, and the second inductor L3 within the dashed box can jointly form a buck circuit.

[0065] Figure 4 is a schematic structural diagram of a boost circuit. As Figure 4 shown, the second switch combination may include the first diode Q1 and the first switching transistor Q2 within the dashed box. Therefore, the second switch combination and the first inductor L1, the second inductor L2, and the second inductor L3 within the dashed box can jointly form a boost circuit.

[0066] Among them, when the buck circuit and the boost circuit are started can be determined by the voltage information of the first vehicle and the second vehicle. In practical applications, when a V2V connection between the first vehicle and the second vehicle is established through the V2V connection device, the electric drive system can read the voltage of the first power battery of the first vehicle through the power battery system of the first vehicle, and read the voltage of the second power battery of the second vehicle through the V2V connection device, and then calculate the difference between the voltage of the first power battery and the voltage of the second power battery, and determine the control mode of the first vehicle according to this difference. Among them, the control mode may include at least one of a buck mode and a boost mode.

[0067] Serial number Difference between the voltage of the first power battery and the voltage of the second power battery Control mode of the first vehicle 1 Positive Step-down mode 2 Negative or zero Step-up mode

[0068] Table 1

[0069] As shown in Table 1, when the difference is positive, it indicates that the voltage of the first power battery is greater than the voltage of the second power battery, then the control mode of the first vehicle can be determined to be the buck mode; when the difference is negative or zero, it indicates that the voltage of the first power battery is less than or equal to the voltage of the second power battery, then the control mode of the first vehicle can be determined to be the boost mode.

[0070] Among them, the voltage of the first power battery is the input voltage Vin of the first power battery received at the input end.

[0071] In an embodiment, the buck circuit is used to step down the input voltage to obtain a stepped-down output voltage when the input voltage is greater than the voltage of the second power battery.

[0072] When the voltage of the first power battery is greater than the voltage of the second power battery, that is, when the input voltage Vin is greater than the voltage of the second power battery, the control mode of the first vehicle can be determined to be the buck mode. In the buck mode, the electric drive system can start the buck circuit and step down the input voltage Vin through the buck circuit to obtain a stepped-down output voltage Vout.

[0073] Specifically, the calculation formulas for the input voltage and output voltage of the buck circuit are as follows:

[0074] Vout = Vin * D

[0075] Among them, Vin represents the input voltage of the first power battery of the first vehicle received at the input end, Vout represents the stepped-down output voltage output from the output end to the second power battery of the second vehicle, and D represents the duty cycle of the PWM (Pulse Width Modulation) signal output by the electric drive system to the bridge arm circuit.

[0076] In one example, assuming that the voltage of the first power battery is 600V and the voltage of the second power battery is 400V, it means that the input voltage Vin is 600V and the desired output voltage Vout is 400V. By using the buck circuit provided in the embodiments of the present application and reasonably controlling the duty cycle of the switching device, for example, controlling the duty cycle of the switching device to be 2 / 3, a stable V2V output of 400V can be efficiently achieved.

[0077] In one embodiment, the boost circuit is used to boost the input voltage to obtain a boosted output voltage when the input voltage is less than or equal to the voltage of the second power battery.

[0078] When the voltage of the first power battery is less than or equal to the voltage of the second power battery, that is, when the input voltage Vin is less than or equal to the voltage of the second power battery, it can be determined that the control mode of the first vehicle is the boost mode. In the boost mode, the electric drive system can start the boost circuit to boost the input voltage Vin to obtain a boosted output voltage Vout.

[0079] Specifically, the calculation formulas for the input voltage and output voltage of the boost circuit are as follows:

[0080]

[0081] In one example, assuming that the voltage of the first power battery is 400V and the voltage of the second power battery is 600V, it means that the input voltage Vin is 400V and the desired output voltage Vout is 600V. By using the boost circuit provided in the embodiments of the present application and reasonably controlling the duty cycle of the switching device, for example, controlling the duty cycle of the switching device to be 1 / 3, a stable V2V output of 600V can be efficiently achieved.

[0082] It should be noted that the first vehicle should have Figure 5 the basic circuit, and by simplifying Figure 5 the basic circuit to Figure 2 the V2V circuit, the V2V function can be realized, specifically by controllingFigure 5 The fourth relay KM4 in the basic circuit is in a normally open state, so that there is an open circuit between the upper arm of the first bridge arm and the upper arm of each second bridge arm. In this way, a four-switch voltage regulating circuit can be formed by reusing the electric drive system, and then a buck circuit or a boost circuit can be formed by the four-switch voltage regulating circuit and the inductor circuit.

[0083] In practical applications, when the first vehicle is in a driving state, the fourth relay KM4 is closed. See the driving principle diagram in Figure 5 ; when the first vehicle needs V2V output, the fourth relay KM4 is opened. See the V2V principle diagram in Figure 2 .

[0084] In an embodiment, the V2V circuit further includes: a relay circuit, which includes a first relay, a second relay, a third relay, a fourth relay and a fifth relay. The first relay is connected in parallel with the second relay. The first end of the first relay is connected to the positive electrode of the first power battery, and the second end of the first relay is respectively connected to at least two second switching tubes. The first end of the third relay is connected to the negative electrode of the first power battery, and the second end of the third relay is respectively connected to the first switching tube, at least two second diodes and the output terminal. The first end of the fourth relay is connected to the second end of the first relay, the second end of the fourth relay is connected to the first end of the fifth relay, and the second end of the fifth relay is connected to the output terminal; wherein, the fourth relay is in a normally open state.

[0085] It should be noted that the V2V circuit can be deployed on the first vehicle, so the output terminal of the V2V circuit can be set at the first DC charging port of the first vehicle.

[0086] As Figure 2 shown, the V2V circuit may include: the power battery system, the electric drive system, the capacitor circuit, the relay circuit and the first DC charging port of the first vehicle. Among them, the power battery system may include a first power battery, a Fuse (fuse), an R (resistor), and a Hall (current sensor). The electric drive system may include a bridge arm circuit and an inductor circuit. The bridge arm circuit may include transistors Q1 to Q6. Among them, transistors Q2, Q3, and Q5 can be equivalent to switching tubes, and transistors Q1, Q4, and Q6 can be equivalent to diodes. The inductor circuit may include a first inductor L1, a second inductor L2, and a second inductor L3. The capacitor circuit may include a first capacitor C1 and a second capacitor C2. Among them, the first capacitor C1 is respectively connected in parallel with the second bridge arm M2 and the second bridge arm M3, and the second capacitor C2 is connected in parallel with the first bridge arm M1. The relay circuit may include a first relay KM1, a second relay KM2, a third relay KM3, a fourth relay KM4 ( Figure 2a fifth relay KM5 (not shown). The first relay KM1 and the second relay KM2 are connected in parallel. The first end of the first relay KM1 is connected to the positive electrode of the first power battery through a Fuse (fuse), and the second end of the first relay KM1 is connected to the second switching tube Q3 and the second switching tube Q5 through an input terminal. Similarly, the first end of the second relay KM2 is connected to the positive electrode of the first power battery through a Fuse (fuse), and the second end of the second relay KM2 is sequentially connected to the second switching tube Q3 and the second switching tube Q5 through an R (resistor) and an input terminal. The first end of the third relay KM3 is connected to the negative electrode of the first power battery through a Hall (current sensor), and the second end of the third relay is connected to the first switching tube Q2, the second diode Q4, the second diode Q6, and an output terminal (the first DC charging port) through an input terminal. The first end of the fifth relay KM5 is connected to the first diode Q1, and the second end of the fifth relay KM5 is connected to the output terminal (the first DC charging port). Among them, the fourth relay KM4 is in a normally open state, which will cause an open circuit between the first diode Q1 and the second switching tube Q3 and the second switching tube Q5. Therefore, KM4 is Figure 2 not shown in, and the connection relationship between the fourth relay KM4 and other components can be seen simultaneously in Figure 5 , the first end of the fourth relay KM4 is connected to the second end of the first relay KM1, and the second end of the fourth relay KM4 is connected to the first end of the fifth relay KM5.

[0087] In the embodiment of the present application, the V2V circuit may include a first buck state, a second buck state, a first boost state, and a second boost state. Among them, when the V2V circuit is in the first buck state and the second buck state in sequence, it corresponds to the first vehicle being in the buck mode. The first buck state is used to charge the inductor circuit and the second power battery with the first power battery, and the second buck state is used to charge the second power battery with the inductor circuit. Among them, when the V2V circuit is in the first boost state and the second boost state in sequence, it corresponds to the first vehicle being in the boost mode. The first boost state is used to charge the inductor circuit with the first power battery, and the second boost state is used to charge the second power battery with the first power battery and the inductor circuit.

[0088] In one embodiment, when the V2V circuit enters the first step-down state, the first relay, the third relay, and the fifth relay are closed, the second relay is opened, at least two second switching tubes are turned on, and at least two second diodes are reversely cut off, so that the first power battery charges the inductor circuit and the second power battery; when the V2V circuit switches to the second step-down state, the fifth relay is closed, the first relay, the second relay, and the third relay are opened, at least two second switching tubes are turned off, and at least two second diodes are forwardly turned on, so that the inductor circuit charges the second power battery; wherein, the first switching tube is in a normally-off state, and the first diode is in a normally-on state.

[0089] When the V2V circuit enters the first step-down state, the electric drive system can send a closing signal to the first relay KM1, the third relay KM3, and the fifth relay KM5 to close the first relay KM1, the third relay KM3, and the fifth relay KM5, and the electric drive system can send an opening signal to the second relay KM2 to open the second relay KM2, and the electric drive system can send a turning-on signal to the second switching tube Q3 and the second switching tube Q5 to turn on the second switching tube Q3 and the second switching tube Q5. When the second switching tube Q3 and the second switching tube Q5 are in the on state, the second diode Q4 and the second diode Q6 are reversely cut off. The current flow path at this time can include path 1 and path 2. As Figure 6 shown, path 1: the positive pole of the first power battery → KM1 → Q3 → L2 → L1 → Q1 → KM5 → the first DC charging port → the V2V discharge gun → (V2V intelligent controller → V2V charging gun → the second DC charging port → the second power battery) → KM3 → the negative pole of the first power battery; path 2: the positive pole of the first power battery → KM1 → Q5 → L3 → L1 → Q1 → KM5 → the first DC charging port → the V2V discharge gun → (V2V intelligent controller → V2V charging gun → the second DC charging port → the second power battery) → KM3 → the negative pole of the first power battery. It can be seen that the input current of the first power battery flows to the second power battery through two groups of inductors L2-L1 and L3-L1. At this time, the current in the two groups of inductors L2-L1 and L3-L1 gradually rises, and a self-induced electromotive force with a positive left end and a negative right end is generated at both ends of the two groups of inductors L2-L1 and L3-L1 to hinder the current rise. Therefore, the two groups of inductors L2-L1 and L3-L1 convert electrical energy into magnetic energy and store it. The current in the two groups of inductors L2-L1 and L3-L1 can rise from the minimum value to the maximum value. Therefore, the step-down circuit can achieve: the output voltage Vout is less than the input voltage Vin.

[0090] When VL = Vin - Vout, it indicates that the inductor circuit charging is completed. At this time, the V2V circuit can switch from the first step-down state to the second step-down state. Wherein, VL is the stored voltage of the inductor circuit.

[0091] When the V2V circuit switches to the second step-down state, the electric drive system can send a closing signal to the fifth relay KM5 to close the fifth relay KM5, and the electric drive system can send opening signals to the first relay KM1, the second relay KM2, and the third relay KM3 to open the first relay KM1, the second relay KM2, and the third relay KM3, and the electric drive system can send opening signals to the second switching tube Q3 and the second switching tube Q5 to open the second switching tube Q3 and the second switching tube Q5. When the second switching tube Q3 and the second switching tube Q5 are in the open state, the second diode Q4 and the second diode Q6 are forward-conducting. The current flow at this time can include path 3 and path 4, as Figure 7 shown. Path 3: L2 → L1 → Q1 → KM5 → the first DC charging port → the V2V discharge gun → (V2V intelligent controller → V2V charging gun → the second DC charging port → the second power battery) → Q4 → L2; Path 4: L3 → L1 → Q1 → KM5 → the first DC charging port → the V2V discharge gun → (V2V intelligent controller → V2V charging gun → the second DC charging port → the second power battery) → Q6 → L3. It can be seen that the disconnection of the second switching tube Q3 and the second switching tube Q5 results in no input current flowing to the two groups of inductors L2-L1 and L3-L1. Therefore, the current in the two groups of inductors L2-L1 and L3-L1 gradually decreases, and an induced electromotive force with a positive right end and a negative left end is generated at both ends of the two groups of inductors L2-L1 and L3-L1 to impede the current decrease, so that the second diode Q4 and the second diode Q6 are forward-conducting. Then, the current in the two groups of inductors L2-L1 and L3-L1 forms a loop through the second diode Q4 and the second diode Q6, and the magnetic energy stored in the two groups of inductors L2-L1 and L3-L1 is converted into electrical energy and released to the second power battery, realizing: VL = Vout, and the current in the two groups of inductors L2-L1 and L3-L1 can drop from the maximum value to the minimum value.

[0092] It should be noted that when the V2V circuit is in the first step-down state or the second step-down state, the first switching tube Q2 is in a normally open state, and the first diode Q1 is in a normally conducting state, which is equivalent to the first switching tube Q2 being open-circuited, and the first diode Q1 serves as a wire.

[0093] In one embodiment, when the V2V circuit enters the first boost state, the first relay and the third relay are closed, the second relay and the fifth relay are open, the first switching transistor is turned on, and the first diode is reverse-biased and cut off, so that the first power battery charges the inductor circuit; when the V2V circuit switches to the second boost state, the first relay, the third relay, and the fifth relay are closed, the second relay is open, the first switching transistor is turned off, and the first diode is forward-biased and conducting, so that the first power battery and the inductor circuit charge the second power battery; wherein, at least two second switching transistors are in a normally-conducting state, and at least two second diodes are in a normally-cut-off state.

[0094] When the V2V circuit enters the first boost state, the electric drive system can send a closing signal to the first relay KM1 and the third relay KM3 to close the first relay KM1 and the third relay KM3, and the electric drive system can send an opening signal to the second relay KM2 and the fifth relay KM5 to open the second relay KM2 and the fifth relay KM5, and the electric drive system can send a conducting signal to the first switching transistor Q2 to turn on the first switching transistor Q2. When the first switching transistor Q2 is in the conducting state, the first diode Q1 is reverse-biased and cut off. The current flow path at this time can include path 5 and path 6, as Figure 8 shown. Path 5: The positive electrode of the first power battery → KM1 → Q3 → L2 → L1 → Q2 → KM3 → the negative electrode of the first power battery; Path 6: The positive electrode of the first power battery → KM1 → Q5 → L3 → L1 → Q2 → KM3 → the negative electrode of the first power battery. It can be seen that the input current of the first power battery flows to the two groups of inductors L2-L1 and L3-L1, causing the current in the two groups of inductors L2-L1 and L3-L1 to rise linearly. A self-induced electromotive force with a positive left end and a negative right end is generated at both ends of the two groups of inductors L2-L1 and L3-L1 to impede the current rise. Therefore, the two groups of inductors L2-L1 and L3-L1 convert electrical energy into magnetic energy and store it, and the current in the two groups of inductors L2-L1 and L3-L1 can rise from the minimum value to the maximum value.

[0095] When VL = Vin, it indicates that the inductor circuit charging is completed. At this time, the V2V circuit can switch from the first boost state to the second boost state.

[0096] When the V2V circuit switches to the second boost state, the electric drive system can send a closing signal to the first relay KM1, the third relay KM3, and the fifth relay KM5 to close the first relay KM1, the third relay KM3, and the fifth relay KM5. Also, the electric drive system can send an opening signal to the second relay KM2 to open the second relay KM2. And the electric drive system can send an opening signal to the first switching transistor Q2 to open the first switching transistor Q2. When the first switching transistor Q2 is in the open state, the first diode Q1 conducts forwardly. The current flow at this time can include path 7 and path 8, as Figure 9 shown. Path 7: The positive pole of the first power battery → KM1 → Q3 → L2 → L1 → Q1 → KM5 → the first DC charging port → the V2V discharge gun → (V2V intelligent controller → V2V charging gun → the second DC charging port → the second power battery) → KM3 → the negative pole of the first power battery; Path 8: The positive pole of the first power battery → KM1 → Q5 → L3 → L1 → Q1 → KM5 → the first DC charging port → the V2V discharge gun → (V2V intelligent controller → V2V charging gun → the second DC charging port → the second power battery) → KM3 → the negative pole of the first power battery. It can be seen that when the inductor circuit charging is completed, the current in the two groups of inductors L2 - L1 and L3 - L1 has reached the maximum value. Therefore, the current in the two groups of inductors L2 - L1 and L3 - L1 begins to gradually decrease, generating an induced electromotive force with the right end positive and the left end negative at both ends of the two groups of inductors L2 - L1 and L3 - L1 to impede the current decrease. As a result, the first diode Q1 conducts forwardly. Then the current in the two groups of inductors L2 - L1 and L3 - L1 forms a loop through the first diode Q1. The magnetic energy stored in the two groups of inductors L2 - L1 and L3 - L1 is converted into electrical energy and released to the second power battery. At the same time, the electrical energy of the first power battery is also given to the second power battery. So it can be achieved that: Vout = Vin + VL, that is, the boost circuit can achieve that the output voltage Vout is greater than the input voltage Vin.

[0097] It should be noted that when the V2V circuit is in the first boost state or the second boost state, the second switching transistors Q3 and Q5 are in the normally - conducting state, and the second diodes Q4 and Q6 are in the normally - cut - off state. It is equivalent that the second switching transistors Q3 and Q5 act as wires, and the second diodes Q4 and Q6 are open - circuited.

[0098] It should be noted that the current flow of (V2V intelligent controller → V2V charging gun → the second DC charging port → the second power battery) is not Figures 6 to 9 shown.

[0099] In one embodiment, the first DC charging port is connected to the second DC charging port of a second vehicle through a V2V connection device. The V2V connection device includes a V2V discharge gun, a V2V intelligent controller, and a V2V charging gun. The V2V discharge gun is connected to the first DC charging port, the V2V charging gun is connected to the second DC charging port, and the V2V intelligent controller is used to establish a communication connection between the first vehicle and the second vehicle.

[0100] As Figure 10 shown, through the V2V connection device, the connection between the first DC charging port of the first vehicle and the second DC charging port of the second vehicle can be realized. That is, the output end of the V2V circuit is connected to the second DC charging port of the second vehicle through the V2V connection device. The V2V connection device may include a V2V discharge gun, a V2V intelligent controller, and a V2V charging gun. The V2V discharge gun can be connected to the first DC charging port of the first vehicle, that is, the V2V discharge gun can be connected to the output end of the V2V circuit. The V2V charging gun can be connected to the second DC charging port of the second vehicle. A CAN (Controller Area Network) communication connection needs to be established between the first vehicle and the second vehicle. Therefore, the V2V intelligent controller can be used to establish a CAN communication connection between the first vehicle and the second vehicle. For example, the V2V intelligent controller establishes a CAN communication connection with the first vehicle and a CAN communication connection with the second vehicle, thereby establishing a CAN communication connection between the first vehicle and the second vehicle.

[0101] It should be noted that the first DC charging port can be connected to either the V2V discharge gun or the V2V charging gun. When the electric drive system detects that a plug gun is connected to the first DC charging port, it can collect the matching resistance parameter on the plug gun and identify the type of the plug gun according to the matching resistance parameter. Exemplarily, if the matching resistance parameter is 1K, it is identified that the plug gun is a V2V discharge gun, so the solution of the embodiment of the present application can be executed, that is, the first vehicle uses the V2V circuit deployed to directly charge the second vehicle; if the matching resistance parameter is 10K, it is identified that the plug gun is a V2V charging gun, so other solutions can be executed, or the user can be reminded that the connection position of the plug gun is incorrect, so that the user can timely change the connection position of the V2V discharge gun to the first DC charging port of the first vehicle and change the connection position of the V2V charging gun to the second DC charging port of the second vehicle.

[0102] As can be seen from this example, the V2V circuit provided by the embodiments of the present application can achieve direct charging of the second vehicle by the first vehicle with the help of the V2V circuit, so as to facilitate emergency rescue when the power of the second vehicle is exhausted, thereby improving the user's charging experience. Further, the present application forms a voltage regulating circuit by reusing the electric drive system of the V2V circuit. The voltage input from the first vehicle to the second vehicle can be regulated through the voltage regulating circuit. The voltage is controllable throughout the process, simple and efficient, and has a wide voltage regulation range. Thus, it can meet both the V2V output with low voltage requirements and the V2V output with high voltage requirements. For example, a buck circuit can be used to meet the V2V output of at least 100V, and a boost circuit can be used to meet the V2V output of up to 1000V. Further, through the specially designed fourth relay KM4, by controlling the on / off state of the fourth relay KM4, the first vehicle can be arbitrarily switched between the basic circuit and the V2V circuit. For example, by controlling the fourth relay KM4 to close, the first vehicle can be switched to Figure 5 the basic circuit shown, and the driving requirements of the first vehicle can be met by using the basic circuit; by controlling the fourth relay KM4 to open, the first vehicle can be switched to Figure 2 the V2V circuit shown, and the external V2V output requirements of the first vehicle can be met by using the V2V circuit.

[0103] Corresponding to the foregoing embodiments of the V2V circuit of the present application, the present application also provides a V2V system and corresponding embodiments.

[0104] Figure 11 is a schematic structural diagram of the V2V system shown in the embodiments of the present application.

[0105] See Figure 11 , the V2V system 1100 may include: a first vehicle 1110 and a second vehicle 1120. Among them, the first vehicle 1110 may include a first power battery 1111, the second vehicle 1120 may include a second power battery 1121, and the first vehicle 1110 may be deployed with the V2V circuit 1112 as described above. The output end of the V2V circuit 1112 may be disposed at the first DC charging port (DC1) of the first vehicle 1110. The first DC charging port (DC1) is connected to the second DC charging port (DC2) of the second vehicle 1112. The V2V circuit 1112 is used to regulate the input voltage (Vin) received from the first power battery 1111 of the first vehicle 1111 and output the regulated output voltage (Vout) to the second power battery 1121 of the second vehicle 1120 through the first DC charging port (DC1) and the second DC charging port (DC2).

[0106] In one embodiment, the V2V system 1100 may further include: a V2V connection device 1130 respectively connected to a first DC charging port (DC1) and a second DC charging port (DC2), wherein the V2V connection device 1130 may include a V2V discharge gun 1131, a V2V intelligent controller 1132, and a V2V charging gun 1133. The V2V discharge gun 1131 is connected to the first DC charging port (DC1), the V2V charging gun 1133 is connected to the second DC charging port (DC2), and the V2V intelligent controller 1132 is configured to establish a communication connection between the first vehicle 1110 and the second vehicle 1120, such as establishing a CAN communication connection between the first vehicle 1110 and the second vehicle 1120.

[0107] Regarding the V2V system 1100 in the above embodiments, the manner in which each device performs operations has been described in detail in the embodiments related to the V2V circuit, and will not be elaborated herein.

[0108] An embodiment of the present application further provides a vehicle, including the V2V circuit as described above.

[0109] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the disclosed embodiments.

Claims

1. A V2V circuit, characterized in that: include: An input terminal, an electric drive system and an output terminal connected in sequence, wherein the input terminal is used to receive an input voltage of a first power battery of a first vehicle, and the output terminal is used to output a regulated output voltage to a second power battery of a second vehicle; The electric drive system includes a bridge arm circuit and an inductance circuit, wherein the inductance circuit includes a first inductance and at least two second inductances connected to the first inductance, and the bridge arm circuit includes a first bridge arm connected to the first inductance and at least two second bridge arms respectively connected to at least two second inductances; Any one of the second bridge arms and the first bridge arm forms a voltage regulating circuit, and the voltage regulating circuit is used to regulate the input voltage to obtain the regulated output voltage.

2. The V2V circuit according to claim 1, characterized in that: The voltage regulating circuit includes at least two groups; wherein, A first switch combination composed of at least two groups of the voltage regulating circuits and the inductor circuit constitute a step-down circuit, and the step-down circuit is used to step down the input voltage to obtain a stepped-down output voltage when the input voltage is greater than the voltage of the second power battery; A second switch combination consisting of at least two groups of the voltage regulating circuits and the inductor circuit constitute a boost circuit, and the boost circuit is used to boost the input voltage to obtain a boosted output voltage when the input voltage is less than or equal to the voltage of the second power battery.

3. The V2V circuit according to claim 2, characterized in that: The upper bridge arm of the first bridge arm is provided with a first diode, the lower bridge arm of the first bridge arm is provided with a first switch tube, the upper bridge arm of each second bridge arm is provided with a second switch tube, and the lower bridge arm of each second bridge arm is provided with a second diode, the first switch combination includes at least two of the second switch tubes and at least two of the second diodes, and the second switch combination includes the first switch tube and the first diode.

4. The V2V circuit according to claim 3, characterized in that: Also includes: A relay circuit, wherein the relay circuit includes a first relay, a second relay, a third relay, a fourth relay and a fifth relay, wherein the first relay is connected in parallel with the second relay, a first end of the first relay is connected to the positive electrode of the first power battery, a second end of the first relay is respectively connected to at least two of the second switch tubes, a first end of the third relay is connected to the negative electrode of the first power battery, a second end of the third relay is respectively connected to the first switch tube, at least two of the second diodes and the output end, a first end of the fourth relay is connected to the second end of the first relay, a second end of the fourth relay is connected to the first end of the fifth relay, and a second end of the fifth relay is connected to the output end; wherein the fourth relay is in a normally disconnected state.

5. The V2V circuit according to claim 4, characterized in that: When the V2V circuit enters the first step-down state, the first relay, the third relay and the fifth relay are closed, the second relay is disconnected, at least two of the second switch tubes are turned on, and at least two of the second diodes are reversely cut off, so that the first power battery charges the inductor circuit and the second power battery; When the V2V circuit is switched to the second step-down state, the fifth relay is closed, the first relay, the second relay and the third relay are disconnected, at least two of the second switch tubes are disconnected, and at least two of the second diodes are forwardly conducted, so that the inductor circuit charges the second power battery; The first switch tube is in a normally-off state, and the first diode is in a normally-on state.

6. The V2V circuit according to claim 4, characterized in that: When the V2V circuit enters the first boost state, the first relay and the third relay are closed, the second relay and the fifth relay are disconnected, the first switch tube is turned on, and the first diode is reversely cut off, so that the first power battery charges the inductor circuit; When the V2V circuit switches to the second boost state, the first relay, the third relay and the fifth relay are closed, the second relay is disconnected, the first switch tube is disconnected, and the first diode is forwardly conducted, so that the first power battery and the inductor circuit charge the second power battery; Among them, at least two of the second switch tubes are in a normally on state, and at least two of the second diodes are in a normally off state.

7. The V2V circuit according to claim 1, characterized in that: The output end is arranged at a first DC charging port of the first vehicle, and the first DC charging port is connected to a second DC charging port of the second vehicle through a V2V connection device, wherein the V2V connection device includes a V2V discharge gun, a V2V intelligent controller and a V2V charging gun, the V2V discharge gun is connected to the first DC charging port, the V2V charging gun is connected to the second DC charging port, and the V2V intelligent controller is used to establish a communication connection between the first vehicle and the second vehicle.

8. A V2V system, characterized in that: include: A first vehicle and a second vehicle, wherein the first vehicle is deployed with the V2V circuit according to any one of claims 1 to 7, a first DC charging port of the V2V circuit is connected to a second DC charging port of the second vehicle, and the V2V circuit is used to regulate the input voltage received from the first power battery of the first vehicle and output the regulated output voltage to the second power battery of the second vehicle through the first DC charging port and the second DC charging port.

9. The V2V system according to claim 8, characterized in that: Also includes: A V2V connection device connected to the first DC charging port and the second DC charging port respectively, wherein the V2V connection device includes a V2V discharge gun, a V2V intelligent controller and a V2V charging gun, the V2V discharge gun is connected to the first DC charging port, the V2V charging gun is connected to the second DC charging port, and the V2V intelligent controller is used to establish a communication connection between the first vehicle and the second vehicle.

10. A vehicle, characterized in that: Comprising the V2V circuit as claimed in any one of claims 1 to 7.

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