Charging and discharging circuit, switch sintering detection method thereof, controller and vehicle

Abstract

The invention discloses a charging and discharging circuit, a switch sintering detection method of the charging and discharging circuit, a controller and a vehicle, relates to the technical field of vehicles, and aims to solve the problem of failure of insulation detection. The charging and discharging circuit comprises a first branch circuit, a switch unit and a capacitive unit, the first branch circuit is connected between a first charging line and a negative line, and the first charging line and the negative line are suitable for being connected with a charging pile; the first end of the capacitive unit is connected with the grounding end, and the second end of the capacitive unit is connected to the negative electrode wire; the switch unit is connected between the second end of the capacitive unit and the first end of the first charging line, and the first end of the first charging line is the end, connected with the charging pile, of the first charging line.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a charging and discharging circuit, a method for detecting switch sintering thereof, a controller and a vehicle. Background Art

[0002] With the rise of the new energy vehicle industry, the new energy vehicle industry has entered a new stage of large-scale development. At present, in the process of insulation detection in related technologies, the Y capacitors of the whole vehicle will be incorporated into the insulation detection circuit, resulting in the problem of insulation detection failure. Summary of the Invention

[0003] The purpose of the present invention is to provide a charging and discharging circuit, a method for detecting switch sintering thereof, a controller and a vehicle, aiming to avoid the problem of insulation detection failure.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a charging and discharging circuit, including a first branch, a switch unit and a capacitive unit. The first branch is connected between a first charging line and a negative line, and the first charging line and the negative line are adapted to be connected to a charging pile; a first end of the capacitive unit is connected to a ground terminal, and a second end of the capacitive unit is connected to the negative line; the switch unit is disposed between the second end of the capacitive unit and a first end of the first charging line, and the first end of the first charging line is the end where the first charging line is connected to the charging pile.

[0005] Based on the above solution, some embodiments of the present application provide a charging and discharging circuit. A switch unit is provided in the charging and discharging circuit. By controlling the state of the switch unit, for example, when the switch unit is in an off state, the problem of insulation detection failure can be avoided. Specifically, when the switch unit is in an off state, the capacitive unit can be isolated from the charging pile, preventing the capacitive unit from being incorporated into the insulation detection circuit, that is, the capacitive unit and the charging pile are in a disconnected state, so as to avoid the problem of insulation detection failure of the charging pile.

[0006] In some embodiments, the switch unit is connected between the second end of the capacitive unit and the first end of the first branch, and the first end of the first branch is the end where the first branch is connected to the negative line.

[0007] In some embodiments, the switch unit is connected between the first end and the second end of the first branch, and the second end of the first branch is the end where the first branch is connected to the first charging line.

[0008] In some embodiments, the switch unit is connected between the second end of the first branch and the first end of the first charging line.

[0009] In some embodiments, the first branch includes an energy storage unit. The first end of the energy storage unit is connected to the negative line, the second end of the energy storage unit is connected to the first end of the switching unit, and the second end of the switching unit is connected to the first charging line.

[0010] In some embodiments, the first branch further includes a detection unit. The first end of the detection unit is connected to the first end of the energy storage unit, and the second end of the detection unit is connected to the second end of the energy storage unit.

[0011] In some embodiments, the energy storage unit includes a first capacitor. The first end of the first capacitor serves as the first end of the energy storage unit, and the second end of the first capacitor serves as the second end of the energy storage unit.

[0012] In some embodiments, the switching unit includes a first switch. The first end of the first switch serves as the first end of the switching unit, and the second end of the first switch serves as the second end of the switching unit.

[0013] In some embodiments, the capacitive unit includes a third capacitor. The first end of the third capacitor serves as the first end of the capacitive unit, and the second end of the third capacitor serves as the second end of the capacitive unit.

[0014] In some embodiments, the charge and discharge circuit includes a power supply and an inverter circuit. The power supply and the inverter circuit are respectively connected between the first DC bus and the negative line. The inverter circuit is further configured to connect to the first end of the load, and the second end of the load is connected to the first charging line.

[0015] In some embodiments, the power supply includes at least a first battery unit and a second battery unit. The positive electrode of the first battery unit is connected to the first DC bus, the negative electrode of the first battery unit is connected to the positive electrode of the second battery unit, and the negative electrode of the second battery unit is connected to the negative line.

[0016] In some embodiments, the charge and discharge circuit further includes a second switch. The second switch is connected to the first DC bus and is located between the power supply and the inverter circuit.

[0017] In some embodiments, the charge and discharge circuit further includes a third switch and a first resistor. The third switch and the first resistor are connected in series between the power supply and the inverter circuit.

[0018] In some embodiments, the charge and discharge circuit further includes a fourth switch. The fourth switch is connected to the negative line and is located between the power supply and the inverter circuit.

[0019] In some embodiments, the inverter circuit includes a second capacitor. The second capacitor is connected between the first DC bus and the negative line.

[0020] In some embodiments, the inverter circuit includes at least one leg circuit; a first end of the leg circuit is connected to a first DC bus, a second end of the leg circuit is connected to a negative line, and a third end of the leg circuit is configured to be connected to a load.

[0021] In some embodiments, a fifth switch is further included, the load includes an inductor component, a first end of the inductor component is connected to the third end of the leg circuit, a second end of the inductor component is electrically connected to a first end of the fifth switch, and a second end of the fifth switch is connected to a first end of the switching unit.

[0022] In some embodiments, a sixth switch is further included, the sixth switch is connected to the negative line, and a first end of the sixth switch is connected to a first end of the energy storage unit, and a second end of the sixth switch is adapted to be connected to a charging pile.

[0023] In a second aspect, the present application provides a method for detecting switch sintering of a charge and discharge circuit, including the charge and discharge circuit provided in any of the above embodiments, and the charge and discharge circuit is applied to a vehicle; the detection method includes: When the vehicle is in a high-voltage power-on state and is in a non-charging and non-driving state, control the first switch and the fifth switch of the charge and discharge circuit to be in different on-off states; Control the detection unit of the charge and discharge circuit to detect the voltage across the first capacitor of the charge and discharge circuit; Judge the sintering state of the first switch or the fifth switch of the charge and discharge circuit according to the voltage detected by the detection unit of the charge and discharge circuit.

[0024] Wherein, the beneficial effects in the second aspect and its possible embodiments can refer to the first aspect, which will not be elaborated here.

[0025] In some embodiments, when the first switch is turned on and the fifth switch is turned off, after the upper leg of the leg circuit of the control circuit is turned on, control the detection unit to perform detection; If the voltage detected by the detection unit is greater than a preset voltage, it is determined that the fifth switch is sintered.

[0026] In some embodiments, when the fifth switch of the charge and discharge circuit is in a sintered state, the vehicle speed is limited within a preset vehicle speed range, and a speed limit alarm signal is issued.

[0027] In some embodiments, when the fifth switch is turned on and the first switch is turned off, after the upper leg of the leg circuit of the control circuit is turned on, control the detection unit to perform detection; If the voltage detected by the detection unit is greater than a preset voltage, it is determined that the first switch is sintered.

[0028] In some embodiments, when the first switch of the charge and discharge circuit is in a sintered state, the vehicle speed is limited within a preset vehicle speed range, and a speed limit alarm signal is issued.

[0029] In a third aspect, the present application provides a controller, which includes: a processor and a memory for storing instructions executable by the processor; wherein, the processor is configured to: execute the steps of the switch sintering detection method for the charge and discharge circuit described in the above embodiments.

[0030] Among them, the beneficial effects in the third aspect and its possible embodiments can refer to the first aspect, which will not be elaborated here.

[0031] In a fourth aspect, the present application provides a vehicle, which includes the charge and discharge circuit provided in any of the above embodiments, or the controller provided in the above embodiments.

[0032] Among them, the beneficial effects in the fourth aspect and its possible embodiments can refer to the first aspect, which will not be elaborated here.

[0033] In a fifth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored. When the computer instructions run on a processor, the processor is caused to execute the switch sintering detection method for the charge and discharge circuit provided in any of the above embodiments.

[0034] Among them, the beneficial effects in the fifth aspect and its possible embodiments can refer to the first aspect, which will not be elaborated here.

[0035] In a sixth aspect, the present application provides a computer program product, which includes a computer program. When the computer program runs on a computer, the computer is caused to execute the switch sintering detection method for the charge and discharge circuit provided in any of the above embodiments.

[0036] Among them, the beneficial effects in the sixth aspect and its possible embodiments can refer to the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a schematic structural diagram of a vehicle drive system in the related art; Figure 2 It is a topological structure diagram of a charge and discharge circuit provided by an embodiment of the present application; Figure 3 It is a flowchart of a control method for a charge and discharge circuit provided by an embodiment of the present application; Figure 4Flowchart of a method for detecting switch sintering in a charge and discharge circuit provided by an embodiment of the present application; Figure 5 Flowchart of a method for detecting and processing switch sintering in a charge and discharge circuit provided by an embodiment of the present application; Figure 6 Structure diagram of a vehicle provided by an embodiment of the present application.

[0039] Reference numerals: 100, charge and discharge circuit; 1, switch unit; K1, first switch; K2, second switch; K3, third switch; K4, fourth switch; K5, fifth switch; K6, sixth switch; R1, first resistor; 2, power supply; 21, first battery unit; 22, second battery unit; 3, energy storage unit; 4, inverter circuit; 40, bridge arm circuit; 41, first bridge arm circuit; 411, first end of the first bridge arm circuit; 412, second end of the first bridge arm circuit; 413, third end of the first bridge arm circuit; 42, second bridge arm circuit; 421, first end of the second bridge arm circuit; 422, second end of the second bridge arm circuit; 423, third end of the second bridge arm circuit; 43, third bridge arm circuit; 431, first end of the third bridge arm circuit; 432, second end of the third bridge arm circuit; 433, third end of the third bridge arm circuit; 5, first DC bus; 6, negative line; 61, second DC bus; 62, second charging line; 7, load; 8, charge and discharge interface; 81, first end of the charge and discharge interface; 82, second end of the charge and discharge interface; C1, first capacitor; C2, second capacitor; L1, inductor component; 9, capacitive unit; 91, third capacitor; 10, first charging line; 11, first branch; 200, controller; 300, charging pile; 400, detection unit; 1000, vehicle. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of the invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or relative positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. Without special instructions, in the case of satisfying the relative positional relationship shown in the drawings, the above-mentioned directional descriptions can be flexibly set during the actual application process.

[0042] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. 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 invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", and "communicated with" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the embodiments of the present invention, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, article or device comprising such element.

[0045] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0046] With the rapid development of new energy vehicles and the widespread use of electric vehicles, the demand for the overall vehicle power of electric vehicles is also increasing.

[0047] Currently, to increase the overall vehicle power of an electric vehicle, the voltage of the power supply of the electric vehicle is mainly increased to reduce the magnitude of the supply current. However, as the voltage increases, problems such as, but not limited to, a decrease in the motor drive efficiency will occur. For example, when the electric vehicle uses a high-voltage power supply to directly drive the motor and the drive voltage cannot be switched, in this case, when the voltage of the power supply is relatively high, the drive efficiency of the electric vehicle will decrease.

[0048] Referring to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a vehicle drive system in the related art, including: a power transmission unit 500 and an external device 600. Among them, the power transmission unit 500 includes a capacitor 210, a first relay 220, and a second relay 230. The first relay 220 and the second relay 230 are respectively located at both ends of the capacitor 210. After being connected to the external device 600, for example, when the external device 600 is a charging pile, during insulation detection, the Y capacitor of the vehicle high-voltage circuit can be paralleled through the voltage sampling circuit at both ends of the capacitor 210, resulting in an increase in the capacitance value of the insulation detection circuit, which easily triggers the failure of insulation detection, increases the cost, and is prone to the risk of hardware failure.

[0049] Based on this, an embodiment of the present application further provides a charge and discharge circuit 100. Referring to Figure 2 , the charge and discharge circuit 100 includes a first branch 11, a switch unit 1, and a capacitive unit 9. The first branch 11 is connected between the first charging line 10 and the negative line 6. The first charging line 10 and the negative line 6 are adapted to be connected to the charging pile 300. The first end of the capacitive unit 9 is connected to the ground terminal, the second end of the capacitive unit 9 is connected to the negative line 6, and the switch unit 1 is connected between the second end of the capacitive unit 9 and the first end of the first charging line 10. The first end of the first charging line 10 is the end where the first charging line 10 is connected to the charging pile 300. When the switch unit 1 is in the off state, it is used to implement the insulation detection of the charging pile 300.

[0050] Exemplarily, a switch unit 1 is connected between the end of the first charging line 10 connected to the charging pile 300 and the second end of the capacitive unit 9. That is to say, the switch unit 1 can be arranged on the first charging line 10. Similarly, it can also be arranged on the negative line 6 or on the first branch 11. The specific position of the switch unit 1 is not limited here.

[0051] In some embodiments, the switch unit 1 is connected between the second end of the capacitive unit 9 and the first end of the first branch 11. The first end of the first branch 11 is the end where the first branch 11 is connected to the negative line 6.

[0052] In some embodiments, the switch unit 1 is connected between the first end and the second end of the first branch 11, and the second end of the first branch 11 is the end where the first branch 11 is connected to the first charging line 10.

[0053] In some embodiments, the switch unit 1 is connected between the second end of the first branch 11 and the first end of the first charging line 10.

[0054] It should be noted that the above switch unit 1 can be connected at any position in the loop formed by the first charging line 10, the first branch 11, and the negative line 6, and no specific limitation is made.

[0055] Based on the above solution, in some embodiments of the present application, a charge and discharge circuit 100 is provided. A switch unit 1 is provided in the charge and discharge circuit 100. By controlling the state of the switch unit 1, for example, when the switch unit 1 is in the off state, the problem of failure of insulation detection can be avoided. It should be noted that the above capacitive unit 9 includes a Y capacitor. Specifically, when the switch unit 1 is in the off state, the capacitive unit 9 can be isolated from the charging pile 300, and the capacitive unit 9 is prevented from being connected to the insulation detection loop, that is, the capacitive unit 9 and the charging pile 300 are in a disconnected state, so as to avoid the problem of failure of insulation detection of the charging pile 300.

[0056] It should be noted that, for example, B1 / B0 appearing in the drawings of the present disclosure indicates that component B1 belongs to component B0, and other similar reference numerals appearing in the drawings also follow the above description.

[0057] In some embodiments, continue to refer to Figure 2 , the first branch 11 includes an energy storage unit 3. The first end of the energy storage unit 3 is connected to the negative line 6, the second end of the energy storage unit 3 is connected to the first end of the switch unit 1, and the second end of the switch unit 1 is connected to the first charging line 10.

[0058] In some embodiments, continue to refer to Figure 2 , the first branch 11 further includes a detection unit 400. The first end of the detection unit 400 is connected to the first end of the energy storage unit 3, and the second end of the detection unit 400 is connected to the second end of the energy storage unit 3.

[0059] It can be understood that the above connection relationship can result in the energy storage unit 3 and the detection unit 400 being connected in parallel. Among them, the energy storage unit 3 can be used to store electrical energy.

[0060] Exemplarily, when performing the insulation detection of the charging pile 300 and when the switch unit 1 is turned on, a path can be formed between the first charging line 10, the switch unit 1, the detection unit 400 and the capacitive unit 9. That is to say, the detection unit 400 is equivalent to a wire being connected to the detection circuit, resulting in the failure of the insulation detection of the charging pile 300. Therefore, in this application, the switch unit 1 is set to be in an off state during the insulation detection process, that is, at this time, the first charging line 10, the switch unit 1, the detection unit 400 to the capacitive unit 9 are in an open circuit state, preventing the capacitive unit 9 from being connected to the insulation detection circuit, that is, the capacitive unit 9 is in a disconnected state from the charging pile 300, so as to avoid the problem of the failure of the insulation detection of the charging pile 300.

[0061] In some embodiments, as Figure 2 shown, the energy storage unit 3 includes a first capacitor C1. The first end of the first capacitor C1 serves as the first end of the energy storage unit 3, and the second end of the first capacitor C1 serves as the second end of the energy storage unit 3.

[0062] In some embodiments, as Figure 2 shown, the switch unit 1 includes a first switch K1. The first end of the first switch K1 serves as the first end of the switch unit 1, and the second end of the first switch K1 serves as the second end of the switch unit 1.

[0063] Exemplarily, the number of the first switches K1 here is not limited. It can be only one or multiple. For example, when there are two first switches K1 and the two first switches K1 are connected in parallel, when one of the first switches K1 fails, the other first switch K1 can be controlled to ensure the effectiveness of the first switch K1 during the insulation detection and the charge and discharge process.

[0064] Exemplarily, the first switch K1 and the first capacitor C1 are connected in parallel across both ends of the charge and discharge interface of the charge and discharge circuit 100. That is to say, the first switch K1 can independently control the on-off situation of the first capacitor C1, that is, as Figure 2 shown, the first switch K1 and the first capacitor C1 form a branch.

[0065] In some embodiments, as Figure 2 shown, the first end of the first capacitor C1 is connected to the negative wire 6, and the second end of the first capacitor C1 is connected to the first end of the first switch K1.

[0066] According to the description of the foregoing content, this is only an example of the series connection of the first capacitor C1 and the first switch K1, and is not specifically limited.

[0067] In some embodiments, the capacitive unit 9 includes a third capacitor 91. The first end of the third capacitor 91 serves as the first end of the capacitive unit 9, and the second end of the third capacitor 91 serves as the second end of the capacitive unit 9.

[0068] It should be noted that the above capacitive unit 9 is a safety capacitor, that is, a Y capacitor.

[0069] In some embodiments, continuing to refer to Figure 2 , the charge and discharge circuit 100 further includes a power supply 2 and an inverter circuit 4; wherein, the power supply 2 and the inverter circuit 4 are respectively connected between the first DC bus 5 and the negative line 6; the inverter circuit 4 is further configured to connect to the first end of the load 7, and the second end of the load 7 is connected to the first charging line 10.

[0070] Exemplarily, the above load 7 may be a motor.

[0071] It should be noted that according to the above content, a switch unit 1 and an energy storage unit 3 are connected between the second end of the load 7 and the negative line 6. Referring to Figure 2 , the second end of the load 7 is connected to the first charging line 10. That is to say, the switch unit 1 may be disposed between the second end of the load 7 and the energy storage unit 3, or may be disposed between the negative line 6 and the energy storage unit 3, which is not specifically limited herein. For the sake of convenience of description, in some embodiments of the present application Figure 2 the switch unit 1 is taken as an example that can be disposed between the second end of the load 7 and the energy storage unit 3 for illustration.

[0072] In some embodiments, referring to Figure 2 , the power supply 2 includes at least a first battery unit 21 and a second battery unit 22. The positive electrode of the first battery unit 21 is connected to the first DC bus 5, the negative electrode of the first battery unit 21 is connected to the positive electrode of the second battery unit 22, and the negative electrode of the second battery unit 22 is connected to the negative line 6.

[0073] It can be understood that the above connection can connect the first battery unit 21 and the second battery unit 22 in series to increase the voltage across the power supply 2.

[0074] Exemplarily, the above embodiments are only some examples. Specifically, when the power supply 2 includes multiple battery cells, the multiple battery cells can be all connected in series or all connected in parallel. Or, some of the multiple battery cells are connected in series and then connected in parallel with the remaining battery cells, which will not be elaborated one by one and are not specifically limited here. In practical applications, the number of battery cells can be selected according to needs and cost considerations. It should also be noted that while the number of battery cells increases, the voltage of the power supply 2 can vary with the series-parallel relationship between the above battery cells, that is, when the number of battery cells increases, the voltage adjustment range of the power supply 2 is larger, and thus the voltage adaptability of the power supply 2 can be broadened during the charging process.

[0075] It can be understood that in the case of series-parallel connection of multiple battery cells, attention needs to be paid to the voltage matching relationship between the battery cells. Exemplarily, when two of the multiple battery cells are connected in parallel, it is necessary to ensure that the voltages of the two battery cells are close to each other to avoid too large a voltage difference between the two battery cells, resulting in the situation where the battery cell with a higher voltage charges the battery cell with a lower voltage.

[0076] In some embodiments, referring to Figure 2 , the charge and discharge circuit 100 further includes: a second switch K2, the second switch K2 is connected to the first DC bus 5 and is located between the power supply 2 and the inverter circuit 4.

[0077] The charge and discharge circuit 100 further includes: a third switch K3 and a first resistor R1, the third switch K3 and the first resistor R1 are connected in series between the power supply 2 and the inverter circuit 4.

[0078] Exemplarily, the third switch K3 is connected in series with the first resistor R1, and the series-connected third switch K3 and first resistor R1 are connected in parallel with the second switch K2.

[0079] In some embodiments, referring to Figure 2 , when the second switch K2 is turned on and the third switch K3 is turned off, the power supply 2 is connected to the inverter circuit 4 to form a power supply loop; when the second switch K2 is turned off and the third switch K3 is turned on, the power supply 2 is connected to the first resistor R1 and the inverter circuit 4 to form a pre-charge loop.

[0080] In some embodiments, continuing to refer to Figure 2 , the charge and discharge circuit 100 further includes a fourth switch K4, the fourth switch K4 is connected to the negative line 6 and is located between the power supply 2 and the inverter circuit 4.

[0081] Exemplarily, the third switch K3 is a positive contactor, and / or the fourth switch K4 is a negative contactor.

[0082] In the charge and discharge circuit 100, multiple batteries in the power supply 2 can supply power to the inverter circuit 4 and the load 7. Refer to Figure 2 , the multiple power supplies 2 in the charge and discharge circuit 100 include two batteries, which is only an example here and is not specifically limited.

[0083] In some embodiments, continue to refer to Figure 2 , the inverter circuit 4 includes a second capacitor C2; the second capacitor C2 is connected between the first DC bus 5 and the negative line 6.

[0084] Exemplarily, before charging the power supply 2, it is necessary to first control the second switch K2 to be turned off, and control the third switch K3 and the fourth switch K4 to be turned on. The power supply 2 pre-charges the second capacitor C2. After the second capacitor C2 is fully charged or nearly fully charged, then control the third switch K3 to be turned off, the second switch K2 and the fourth switch K4 to be turned on, and control the other switches in the switch unit 1 to be turned on, so as to achieve the purpose of charging the power supply 2, and it can avoid voltage jumps during the direct charging of the power supply 2 by the charging pile 300 from damaging electronic devices, thereby achieving the purpose of protecting electronic devices.

[0085] In some embodiments, continue to refer to Figure 2 , the inverter circuit 4 includes at least one bridge arm circuit 40; the first end of the bridge arm circuit 40 is connected to the first DC bus 5, the second end of the bridge arm circuit 40 is connected to the negative line 6, and the third end of the bridge arm circuit 40 is used to connect to the load 7.

[0086] Exemplarily, the inverter circuit 4 includes a first bridge arm circuit 41 and a second bridge arm circuit 42; the first end 411 of the first bridge arm circuit is connected to the first DC bus 5, the second end 412 of the first bridge arm circuit is connected to the negative line 6, and the third end 413 of the first bridge arm circuit is used to connect to the load 7; the first end 421 of the second bridge arm circuit is connected to the first DC bus 5, the second end 422 of the second bridge arm circuit is connected to the negative line 6, and the third end 423 of the second bridge arm circuit is used to connect to the load 7, where the load 7 here can be a motor winding.

[0087] Exemplarily, refer to Figure 2 , the first end 411 of the first bridge arm circuit is connected to the first DC bus 5. When the second switch K2 is turned on, the first end 411 of the first bridge arm circuit receives the electrical signal transmitted by the power supply 2 and transmits it to the load 7 through the third end 413 of the first bridge arm circuit, so that the motor winding works normally.

[0088] The first bridge arm circuit 41 and the second bridge arm circuit 42 are set as above, and the third terminal 413 of the first bridge arm circuit and the third terminal 423 of the second bridge arm circuit are both connected to the motor winding. At this time, the load 7 is the motor winding. That is to say, when the power supply 2 drives the motor winding to work, by turning on the second switch K2 and the fourth switch K4, the current is transmitted from the power supply 2 to the first DC bus 5, from the first terminal 411 of the first bridge arm circuit to the third terminal 413 of the first bridge arm circuit, through the motor winding, from the third terminal 423 of the second bridge arm circuit to the second terminal 422 of the second bridge arm circuit, and then back to the power supply 2 through the negative line 6, thus forming a drive loop. It should be noted that when only one first bridge arm circuit 41 is set in the inverter circuit 4, after the above current passes through the third terminal 413 of the first bridge arm circuit and flows through the motor winding, it can also return to the power supply 2 along the second terminal 412 of the first bridge arm circuit to form a drive loop.

[0089] In some embodiments, referring to Figure 2 , the inverter circuit 4 further includes a third bridge arm circuit 43. The first terminal 431 of the third bridge arm circuit is connected to the first DC bus 5, the second terminal 432 of the third bridge arm circuit is connected to the negative line 6, and the third terminal 433 of the third bridge arm circuit is used to connect to the motor winding.

[0090] Exemplarily, referring to Figure 2 , the third terminal 433 of the third bridge arm circuit in the inverter circuit 4 is used to connect to the motor winding. That is to say, in the drive loop, the current flows from the first terminal 411 to the third terminal of the first bridge arm circuit, flows through the motor winding, and can return to the power supply 2 through the third terminal 433 of the third bridge arm circuit to form a drive loop.

[0091] In some embodiments, a fifth switch K5 is further included. The load 7 includes an inductor component L1. The first end of the inductor component L1 is connected to the third terminal of the bridge arm circuit 40. The second end of the inductor component L1 is electrically connected to the first end of the fifth switch K5. The second end of the fifth switch K5 is connected to the first end of the switch unit 1.

[0092] Exemplarily, the third terminal of the bridge arm circuit 40 here can be any one of the above-mentioned first bridge arm circuit 41, second bridge arm circuit 42, and third bridge arm circuit 43.

[0093] Exemplarily, the inductor component L includes a first inductor, a second inductor, and a third inductor. Among them, the first end of the first inductor is connected to the third terminal 413 of the first bridge arm circuit, the first end of the second inductor is connected to the third terminal 423 of the second bridge arm circuit, and the first end of the third inductor is connected to the third terminal 433 of the third bridge arm circuit.

[0094] In some embodiments, continuing to refer to Figure 2, the charge and discharge circuit 100 further includes a charge and discharge interface 8. The first end 81 of the charge and discharge interface 8 is electrically connected to the first charging line 10, and the second end 82 of the charge and discharge interface 8 is connected to the negative line 6. The charge and discharge interface 8 is adapted to be connected to the load 7 or the charging pile 300.

[0095] Exemplarily, the charge and discharge interface 8 includes a first end 81 and a second end 82. Among them, the first end 81 of the charge and discharge interface 8 is electrically connected to the first charging line 10, and the first end 81 of the charge and discharge interface 8 is used to connect to the positive pole of the charging pile 300. The second end of the charge and discharge interface is used to connect to the negative pole of the charging pile 300. The first DC bus 5 receives the positive pole signal of the charging pile 300 through the first end 81 of the charge and discharge interface 8, and the negative line 6 transmits the electrical signal to the negative pole of the charging pile 300 through the second end 82 of the charge and discharge interface 8.

[0096] In some embodiments, with continued reference to Figure 2 , the charge and discharge circuit 100 further includes a sixth switch K6. The sixth switch K6 is connected to the negative line 6, and the first end of the sixth switch K6 is connected to the second end of the energy storage unit 3, and the second end of the sixth switch K6 is connected to the second end 82 of the charge and discharge interface.

[0097] Exemplarily, when the fifth switch K5 is turned on, the fifth switch K5 can transmit the electrical signal received by the first end 81 of the charge and discharge interface to the motor winding to charge the motor winding.

[0098] Exemplarily, during the process of the charging pile 300 charging the power supply 2 and when the sixth switch K6 is turned on, the second capacitor C2 can be used to store part of the electrical energy so that the voltage of the charging pile 300 is adapted to the voltage of the power supply 2.

[0099] Exemplarily, when the sixth switch K6 is turned on, the sixth switch K6 can transmit the electrical signal received by the negative line 6 to the charging pile 300 through the second end 82 of the charge and discharge interface 8.

[0100] In this embodiment, by controlling the on-off of multiple switches and the on-off of the upper and lower bridge tubes in the inverter circuit 4, the switching among three modes, namely the drive control mode, the direct connection charging mode, and the buck-boost charging mode, can be realized with one charge and discharge circuit 100. The charge and discharge circuit 100 has a simple structure, a small volume, and a low cost, and can meet different requirements.

[0101] It should be noted that the above first switch K1, second switch K2, third switch K3, fourth switch K4, fifth switch K5, and sixth switch K6 can all adopt contactor switches.

[0102] It should be noted that the negative electrode line 6 in this application includes a connected second DC bus 61 and a second charging line 62. Among them, the first end of the second DC bus 61 is connected to the negative electrode of the power supply 2, the second end of the second DC bus 61 is connected to the second end of the inverter circuit 4. Similarly, the first end of the second charging line 62 is connected to the second DC bus 61, and the second end of the second charging line 62 is adapted to be connected to the negative electrode of the charging pile 300. The first end of the first DC bus 5 in this application is connected to the positive electrode of the power supply, the second end of the first DC bus 5 is connected to the first end of the inverter circuit 4, the first end of the first charging line 10 is connected to the second end of the load 7, and the second end of the first charging line 10 is adapted to be connected to the positive electrode of the charging pile 300.

[0103] Referring to Figure 3 and in combination with Figure 2 , the embodiments of this application further provide a control method for the charge and discharge circuit 100, including the charge and discharge circuit 100 provided in any one of the above embodiments; the control method includes: S1. After the charge and discharge circuit 100 receives the DC charging signal, if the voltage across the charge and discharge interface 8 of the charge and discharge circuit 100 is less than the preset voltage and the charge and discharge circuit 100 can receive the data signal of the charging pile 300, control the first switch K1 and the fifth switch K5 of the charge and discharge circuit 100 to conduct, forming a pre-charge loop or a power supply loop.

[0104] S2. After the charge and discharge circuit 100 receives the complete DC charging signal, control the first switch K1 and the fifth switch K5 of the charge and discharge circuit 100 to disconnect.

[0105] It should be noted that the above data signal can be a (Charge Request Message, CPM) message, which is a message used to describe the charging request sent by the charging pile 300 to the electric vehicle. The above preset voltage is the safety voltage during the charging process. Exemplarily, the safety voltage is 60V.

[0106] It can be understood that after the above DC charging is completed, active discharge is required to avoid electric shock to the operator, that is, the voltage of the charge and discharge interface 8 is reduced to below 60V, and then the first switch K1 and the fifth switch K5 are disconnected.

[0107] In some embodiments, after the charge and discharge circuit 100 receives the complete DC charging signal, that is to say, after the charge and discharge circuit 100 exits the DC charging process, after the first interval time, the disconnection operation of the first switch K1 and the fifth switch K5 is performed. Among them, the first interval time here can be 3s, which is only an example here. During the above first interval time, the internal devices of the charge and discharge circuit 100 will consume each other until the voltage of the charge and discharge interface 8 is reduced to below 60V to reduce the safety risk.

[0108] The above control method executes corresponding actions by judging the states of the whole vehicle and the charging pile 300, which can avoid arcing caused by the closing or opening of the contactor due to the existing pressure difference, and ultimately lead to the sintering of the contactor, bringing unnecessary losses to the controller 200.

[0109] It should also be noted that when the first switch K1 and the fifth switch K5 are turned on, the flag bit for the switch is recorded as valid at the same time.

[0110] Refer to Figure 4 Combined with Figure 2 , the embodiment of the present application also provides a method for detecting the sintering of the switch of the charge and discharge circuit 100, including the charge and discharge circuit 100 provided in any one of the above embodiments, and the charge and discharge circuit 100 is applied to a vehicle; The detection method includes: T1. Judge the state of the whole vehicle, determine that the state of the whole vehicle is the first state, the first state is the state where the whole vehicle is powered on with high voltage and is in a non-charging and non-driving state; control the first switch K1 and the fifth switch K5 of the charge and discharge circuit 100 to be in different conduction states.

[0111] T2. Control the detection unit 400 of the charge and discharge circuit 100 to detect the voltage across the first capacitor C1 of the charge and discharge circuit 100.

[0112] T3. Judge the sintering state of the first switch K1 or the fifth switch K5 of the charge and discharge circuit 100 according to the voltage detected by the detection unit 400 of the charge and discharge circuit 100.

[0113] It should be noted that the detection unit of the charge and discharge circuit is configured to detect the voltage across the first capacitor. Only one detection unit is set above. Compared with the related technology, it can also reduce the production cost. At the same time, only setting one detection unit can meet the conditions for detecting sintering.

[0114] Through the above method, the current state of the whole vehicle can be judged to start the sintering detection process, avoiding interference with the driving or charging function, resulting in the failure of the sintering detection or misjudgment.

[0115] In some embodiments, refer to Figure 4 and combined with Figure 1 , the method for detecting the sintering of the switch of the charge and discharge circuit 100 includes: T11. Control the first switch K1 to be turned on and the fifth switch K5 to be turned off, and record that the first switch closing flag is valid; after controlling the upper arm of the bridge arm circuit 40 of the charge and discharge circuit 100 to be turned on, control the detection unit to perform detection; T12. Judge whether the voltage detected by the detection unit is greater than the preset voltage; T13. If so, determine that the fifth switch K5 is sintered; if not, confirm that the fifth switch K5 is not sintered.

[0116] In some embodiments, the fifth switch K5 of the charge and discharge circuit 100 is in a sintered state, restricting the vehicle speed within a preset vehicle speed range and sending out a speed limit warning signal.

[0117] In some other embodiments, the method for detecting the sintering of the switches of the charge and discharge circuit 100 includes: T21. Control the fifth switch K5 to conduct, turn off the first switch K1, and record that the flag indicating that the fifth switch K5 has been attracted is valid; after controlling the upper arm of the bridge arm circuit 40 of the charge and discharge circuit 100 to conduct, control the detection unit to perform detection; T22. Determine whether the voltage detected by the detection unit is greater than a preset voltage; T23. If so, determine that the first switch K1 is sintered; if not, confirm that the first switch K1 is not sintered.

[0118] It should be noted that with reference to Figure 4 , during the sintering detection of the above-mentioned first switch K1 and fifth switch K5, by controlling one of the switches to be attracted, then controlling the upper arm of the inverter circuit 4 to conduct, closing the second switch K2 and the fourth switch K4, and judging the sintering state of the other switch by detecting the voltage across the first capacitor C1. As can be seen from Figure 4 , only one switch is detected in each vehicle power-on cycle, and the sintering states of the first switch K1 and the fifth switch K5 are detected respectively in this cyclic manner. This can reduce the time for the vehicle power-on to light up the indicator light, reduce the sintering risk caused by detection, and at the same time, compared with the related art, it can reduce the number of detection units, save the cost of related hardware and reduce the risk of failure of this part of the hardware.

[0119] In some embodiments, the first switch K1 of the charge and discharge circuit 100 is in a sintered state, restricting the vehicle speed within a preset vehicle speed range and sending out a speed limit warning signal.

[0120] In some other embodiments, when it is detected that the first switch K1 of the charge and discharge circuit 100 and / or the fifth switch K5 of the charge and discharge circuit 100 has not completed the sintering detection, the vehicle speed is restricted within a preset vehicle speed range.

[0121] Exemplarily, when it is detected that the first switch K1 of the charge and discharge circuit 100 and the fifth switch K5 of the charge and discharge circuit 100 have not completed the sintering detection, the vehicle speed is restricted within a preset vehicle speed range.

[0122] Exemplarily, when it is detected that the first switch K1 of the charge and discharge circuit 100 is in a sintered state and the fifth switch K5 of the charge and discharge circuit 100 has not completed the sintering detection, the vehicle speed is limited within a preset vehicle speed range, and a speed limit alarm signal is issued.

[0123] Exemplarily, when it is detected that the first switch K1 of the charge and discharge circuit 100 has not completed the sintering detection and the fifth switch K5 of the charge and discharge circuit 100 is in a sintered state, the vehicle speed is limited within a preset vehicle speed range, and a speed limit alarm signal is issued.

[0124] In some embodiments, during the process of performing insulation detection on the charging pile and before executing the command to disconnect the first switch K1, the sintering detection of the first switch K1 can be performed first to ensure that the first switch K1 is in a normal state. At this time, during the insulation detection process of the charging pile, the first switch K1 can play a role in preventing the third capacitor 91 (Y capacitor) from being connected.

[0125] Refer to Figure 5 And in combination with Figure 2 , the embodiments of the present application further provide a method for detecting and processing the sintering of the switches of the charge and discharge circuit 100, including the charge and discharge circuit 100 provided in any one of the above embodiments.

[0126] The above processing method includes: P1. Determine whether the fifth switch K5 is sintered; P2. If so, limit the vehicle speed within a preset vehicle speed range and issue a speed limit alarm signal; P3. If not, then determine whether the sintering detection of the first switch K1 is completed; P4. If not, continue to limit the vehicle speed within a preset vehicle speed range and issue a speed limit alarm signal; P5. If so, determine whether the first switch K1 is sintered; P6. If so, continue to limit the vehicle speed within a preset vehicle speed range and issue a speed limit alarm signal; P7. If not, cancel the limitation of the vehicle speed within a preset vehicle speed range and cancel the speed limit alarm signal.

[0127] It should be noted that the above preset vehicle speed is 60 km / h, and the above speed limit alarm signal is sent to the instrument of the vehicle, that is, the instrument of the vehicle displays the speed limit alarm signal. The above limitation of the vehicle speed within a preset vehicle speed range can be a parking state, that is, the vehicle speed is 0 km / h, or it can be a driving state, and the vehicle speed is within the range of 60 km / h.

[0128] The above method for processing the sintering of the switches of the charge and discharge circuit 100 can avoid hardware damage during the driving operation due to the sintering of the contactor, and at the same time remind the driver that the current is in a fault mode and requires careful driving and vehicle maintenance.

[0129] Referring to Figure 6 , an embodiment of the present application further provides a controller 200, which includes a processor and a memory for storing instructions executable by the processor; wherein, the processor is configured to: execute the steps of the control method of the charge and discharge circuit 100 provided in the above embodiment, and / or, the steps of the switch sintering detection method of the charge and discharge circuit 100 provided in the above embodiment, and / or, the steps of the switch sintering processing method of the charge and discharge circuit 100 provided in the above embodiment. Therefore, the controller 200 provided by the present invention has all the beneficial effects of the method of the charge and discharge circuit 100 provided in any of the above embodiments, which will not be elaborated here.

[0130] Exemplarily, the processor may be a central processing unit (Central Processing Unit, abbreviated as CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0131] The memory may be a read-only memory (Read-Only Memory, ROM) or other types of static storage devices that can store static information and instructions, a random access memory (Random Access Memory, RAM), or other types of dynamic storage devices that can store information and instructions, or may also be an electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), a compact disc read-only memory (Compact Disc Read-Only Memory, CD-ROM), or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor through a communication bus. The memory may also be integrated with the processor.

[0132] Referring to Figure 6 , an embodiment of the present application further provides a vehicle 1000, including the charge and discharge circuit 100 provided in the above embodiment. Therefore, the charge and discharge circuit 100 provided by the present invention has all the beneficial effects of the charge and discharge circuit 100 provided in any of the above embodiments, which will not be elaborated here.

[0133] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the control method of the charge and discharge circuit 100 provided in the above embodiments, and / or the switch sintering detection method of the charge and discharge circuit provided in any of the above embodiments, and / or the switch sintering processing method of the charge and discharge circuit provided in any of the above embodiments. Therefore, the computer-readable storage medium provided by the present invention has all the beneficial effects of the control method of the charge and discharge circuit 100 provided in any of the above embodiments, and / or the switch sintering detection method of the charge and discharge circuit 100 provided in any of the above embodiments, and / or the switch sintering processing method of the charge and discharge circuit 100 provided in any of the above embodiments, which will not be elaborated herein.

[0134] An embodiment of the present application further provides a computer program product, including a computer program. When the computer program runs on a computer, it causes the computer to execute the control method of the charge and discharge circuit 100 provided in the above embodiments, and / or the switch sintering detection method of the charge and discharge circuit 100 provided in any of the above embodiments, and / or the switch sintering processing method of the charge and discharge circuit 100 provided in any of the above embodiments. Therefore, the computer program product provided by the present invention has all the beneficial effects of the control method of the charge and discharge circuit 100 provided in any of the above embodiments, and / or the switch sintering detection method of the charge and discharge circuit 100 provided in any of the above embodiments, and / or the switch sintering processing method of the charge and discharge circuit 100 provided in any of the above embodiments, which will not be elaborated herein.

[0135] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0136] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A charging and discharging circuit (100), characterized in that: include: A first branch (11), the first branch (11) being connected between a first charging line (10) and a negative line (6), the first charging line (10) and the negative line (6) being suitable for connecting to a charging pile (300); A capacitive unit (9), wherein a first end of the capacitive unit (9) is connected to a ground terminal, and a second end of the capacitive unit (9) is connected to the negative electrode line (6); A switch unit (1), the switch unit (1) being connected between the second end of the capacitive unit (9) and the first end of the first charging line (10), the first end of the first charging line (10) being an end of the first charging line (10) connected to the charging pile (300).

2. The charge-discharge circuit (100) according to claim 1, characterized in that: The switch unit (1) is connected between the second end of the capacitive unit (9) and the first end of the first branch (11); the first end of the first branch (11) is an end of the first branch (11) connected to the negative electrode line (6).

3. The charge-discharge circuit (100) according to claim 1, characterized in that: The switch unit (1) is connected between a first end of the first branch (11) and a second end of the first branch (11); the second end of the first branch (11) is an end of the first branch (11) connected to the first charging line (10).

4. The charge-discharge circuit (100) according to claim 1, characterized in that: The switch unit (1) is connected between the second end of the first branch (11) and the first end of the first charging line (10).

5. The charge-discharge circuit (100) according to claim 3, characterized in that: The first branch (11) comprises: An energy storage unit (3), wherein a first end of the energy storage unit (3) is connected to the negative electrode line (6), a second end of the energy storage unit (3) is connected to a first end of the switch unit (1), and a second end of the switch unit (1) is connected to the first charging line (10).

6. The charge-discharge circuit (100) according to claim 5, characterized in that: The first branch (11) further comprises: A detection unit (400), wherein a first end of the detection unit (400) is connected to a first end of the energy storage unit (3), and a second end of the detection unit (400) is connected to a second end of the energy storage unit (3).

7. The charge-discharge circuit (100) according to claim 5, characterized in that: The energy storage unit (3) comprises a first capacitor (C1), a first end of the first capacitor (C1) serving as the first end of the energy storage unit (3), and a second end of the first capacitor (C1) serving as the second end of the energy storage unit (3).

8. The charge-discharge circuit (100) according to claim 5, characterized in that: The switch unit (1) comprises a first switch (K1), a first end of the first switch (K1) serving as the first end of the switch unit (1), and a second end of the first switch (K1) serving as the second end of the switch unit (1).

9. The charge-discharge circuit (100) according to claim 1, characterized in that: The capacitive unit (9) comprises a third capacitor (91), a first end of the third capacitor (91) serving as the first end of the capacitive unit (9), and a second end of the third capacitor (91) serving as the second end of the capacitive unit (9).

10. The charge-discharge circuit (100) according to any one of claims 1 to 9, characterized in that: The charging and discharging circuit (100) further includes: A power source (2) and an inverter circuit (4); The power source (2) and the inverter circuit (4) are respectively connected between a first DC bus (5) and a negative line (6); The inverter circuit (4) is also used to connect a first end of a load (7), and a second end of the load (7) is connected to the first charging line (10).

11. The charge-discharge circuit (100) according to claim 10, characterized in that: The power source (2) comprises at least a first battery unit (21) and a second battery unit (22), wherein the positive electrode of the first battery unit (21) is connected to the first DC bus (5), the negative electrode of the first battery unit (21) is connected to the positive electrode of the second battery unit (22), and the negative electrode of the second battery unit (22) is connected to the negative electrode line (6).

12. The charge-discharge circuit (100) according to claim 10, characterized in that: Also includes: A second switch (K2), the second switch (K2) is connected to the first DC bus (5) and is located between the power source (2) and the inverter circuit (4).

13. The charge-discharge circuit (100) according to claim 8, characterized in that: Also includes: The third switch (K3) and the first resistor (R1) are connected in series between the power source (2) and the inverter circuit (4).

14. The charge-discharge circuit (100) according to claim 10, characterized in that: Also includes: A fourth switch (K4), the fourth switch (K4) is connected to the negative line (6), and the fourth switch (K4) is located between the power source (2) and the inverter circuit (4).

15. The charge-discharge circuit (100) according to claim 10, characterized in that: The inverter circuit (4) comprises a second capacitor (C2); the second capacitor (C2) is connected between the first DC bus (5) and the negative electrode line (6).

16. The charge-discharge circuit (100) according to claim 10, characterized in that: The inverter circuit (4) comprises at least one bridge arm circuit (40); The first end of the bridge arm circuit (40) is connected to the first DC bus (5), the second end of the bridge arm circuit (40) is connected to the negative electrode line (6), and the third end of the bridge arm circuit (40) is used to connect to the load (7).

17. The charge-discharge circuit (100) according to claim 16, characterized in that: It also includes a fifth switch (K5), the load (7) includes an inductor component (L1), a first end of the inductor component (L1) is connected to the third end of the bridge arm circuit (40), a second end of the inductor component (L1) is electrically connected to the first end of the fifth switch (K5), and a second end of the fifth switch (K5) is connected to the first end of the switch unit (1).

18. The charge-discharge circuit (100) according to claim 5, characterized in that: It also includes a sixth switch (K6), the sixth switch (K6) being connected to the negative line (6), and a first end of the sixth switch (K6) being connected to a first end of the energy storage unit (3), and a second end of the sixth switch (K6) being suitable for connecting to the charging pile (300).

19. A method for detecting sintering of a switch of a charge-discharge circuit (100), characterized in that: A charge-discharge circuit (100) applied to any one of claims 1 to 18, wherein the charge-discharge circuit (100) is applied to a vehicle; The method comprises: When the vehicle is in a high-voltage powered state and in a non-charging state or a non-driving state, controlling the first switch (K1) and the fifth switch (K5) of the charging and discharging circuit (100) to be in different on-off states; Controlling the detection unit (400) of the charge-discharge circuit (100) to detect the voltage across the first capacitor (C1) of the charge-discharge circuit (100); The sintering state of the first switch (K1) or the fifth switch (K5) of the charge-discharge circuit (100) is determined according to the voltage detected by the detection unit (400) of the charge-discharge circuit (100).

20. The switch sintering detection method of the charge and discharge circuit (100) according to claim 19, characterized in that: When the first switch (K1) is turned on and the fifth switch (K5) is turned off, controlling the upper bridge arm of the bridge arm circuit (40) of the charge and discharge circuit (100) to be turned on, and controlling the detection unit (400) to perform detection; If the voltage detected by the detection unit (400) is greater than a preset voltage, it is determined that the fifth switch (K5) is sintered.

21. The method for detecting switch sintering of a charge-discharge circuit (100) according to claim 19, characterized in that: The fifth switch (K5) of the charge-discharge circuit (100) is in a sintered state, limiting the vehicle speed to within a preset vehicle speed range, and issuing a speed limit alarm signal.

22. The method for detecting switch sintering of a charge and discharge circuit (100) according to claim 19, characterized in that: When the fifth switch (K5) is turned on and the first switch (K1) is turned off, controlling the upper bridge arm of the bridge arm circuit (40) of the charge and discharge circuit (100) to be turned on, and controlling the detection unit (400) to perform detection; If the voltage detected by the detection unit (400) is greater than a preset voltage, it is determined that the first switch (K1) is sintered.

23. The method for detecting switch sintering of a charge and discharge circuit (100) according to claim 19, characterized in that: The first switch (K1) of the charge-discharge circuit (100) is in a sintered state, limiting the vehicle speed to within a preset vehicle speed range, and issuing a speed limit alarm signal.

24. The method for detecting switch sintering of a charge-discharge circuit (100) according to claim 19, characterized in that: When it is detected that the first switch (K1) of the charge-discharge circuit (100) and / or the fifth switch (K5) of the charge-discharge circuit (100) have not completed the sintering detection, the vehicle speed is limited to within a preset vehicle speed range.

25. A controller (200), characterized in that: The controller (200) comprises: a processor and a memory for storing instructions executable by the processor; wherein the processor is configured to: execute the steps of the switch sintering detection method of the charge and discharge circuit (100) according to any one of claims 19 to 24.

26. A vehicle (1000), characterized in that It comprises the charge and discharge circuit (100) according to any one of claims 1 to 18 or the controller (200) according to claim 25.

27. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a processor, the processor executes the switch sintering detection method of the charge and discharge circuit (100) according to any one of claims 19 to 24.

28. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is run on a computer, the computer is caused to execute the switch burning detection method of the charging and discharging circuit (100) according to any one of claims 19 to 24.

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