A charging and discharging circuit, its switching sintering detection method, controller, and vehicle.

Abstract

This invention discloses a charging and discharging circuit, a switching sintering detection method, a controller, and a vehicle, relating to the field of vehicle technology, and aims to avoid the problem of insulation detection failure. The charging and discharging circuit includes a first branch, a switching unit, and a capacitive unit. The first branch is connected between a first charging line and a negative line, which are adapted to connect to a charging pile. The first end of the capacitive unit is connected to a ground terminal, and the second end of the capacitive unit is connected to the negative line. The switching unit is connected between the second end of the capacitive unit and the first end of the first charging line, which is the end of the first charging line connected to the charging pile.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a charging and discharging circuit, a method for detecting the switching sintering of the circuit, a controller, and a vehicle. Background Technology

[0002] With the rise of the new energy vehicle industry, the industry has entered a new stage of large-scale development. Currently, during insulation testing, the Y capacitors of the entire vehicle are incorporated into the insulation testing circuit, leading to insulation testing failures. Summary of the Invention

[0003] The purpose of this invention is to provide a charging and discharging circuit, a method for detecting the switching sintering of the circuit, a controller, and a vehicle, in order to avoid the problem of insulation detection failure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In a first aspect, the present invention provides a charging and discharging circuit, including a first branch, a switching 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 grounding terminal, and a second end of the capacitive unit is connected to the negative line. The switching unit is disposed 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 of the first charging line connected to the charging pile.

[0006] Based on the above solutions, some embodiments of this application provide a charging and discharging circuit. This circuit includes a switching unit. By controlling the state of the switching unit, for example, when the switching unit is in the off state, the problem of insulation detection failure can be avoided. Specifically, when the switching unit is in the off state, the capacitive unit can be isolated from the charging pile, preventing the capacitive unit from being connected to the insulation detection circuit. That is, the capacitive unit and the charging pile are in a disconnected state, thus avoiding the problem of insulation detection failure of the charging pile.

[0007] In some embodiments, the switching unit is connected between the second end of the capacitive unit and the first end of the first branch, wherein the first end of the first branch is the end of the first branch connected to the negative line.

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

[0009] In some embodiments, the switching unit is connected between the second end of the first branch and the first end of the first charging cable.

[0010] In some embodiments, the first branch includes an energy storage unit, a first end of which is connected to the negative line, a second end of which is connected to the first end of the switching unit, and a second end of the switching unit is connected to the first charging line.

[0011] In some embodiments, the first branch further includes: a detection unit, the first end of which is connected to the first end of the energy storage unit, and the second end of which is connected to the second end of the energy storage unit.

[0012] In some embodiments, the energy storage unit includes a first capacitor, with a first terminal of the first capacitor serving as a first terminal of the energy storage unit and a second terminal of the first capacitor serving as a second terminal of the energy storage unit.

[0013] In some embodiments, the switching unit includes a first switch, a first end of the first switch serving as a first end of the switching unit, and a second end of the first switch serving as a second end of the switching unit.

[0014] In some embodiments, the capacitive unit includes a third capacitor, the first end of which serves as the first end of the capacitive unit, and the second end of which serves as the second end of the capacitive unit.

[0015] In some embodiments, the charging / discharging circuit includes a power supply and an inverter circuit; wherein the power supply and the inverter circuit are respectively connected between a first DC bus and a negative line. The inverter circuit is also used to connect a first terminal of the load, and a second terminal of the load is connected to a first charging line.

[0016] In some embodiments, the power supply includes at least a first battery unit and a second battery unit, the positive terminal of the first battery unit is connected to a first DC bus, the negative terminal of the first battery unit is connected to the positive terminal of the second battery unit, and the negative terminal of the second battery unit is connected to a negative line.

[0017] In some embodiments, the charging and discharging circuit further includes a second switch, which is connected to the first DC bus and located between the power supply and the inverter circuit.

[0018] In some embodiments, the charging and discharging circuit further includes a third switch and a first resistor, wherein the third switch and the first resistor are connected in series between the power supply and the inverter circuit.

[0019] In some embodiments, the charging and discharging circuit further includes a fourth switch, which is connected to the negative line and is located between the power supply and the inverter circuit.

[0020] In some embodiments, the inverter circuit includes a second capacitor; the second capacitor is connected between the first DC bus and the negative line.

[0021] In some embodiments, the inverter circuit includes at least one bridge arm circuit; the first end of the bridge arm circuit is connected to the first DC bus, the second end of the bridge arm circuit is connected to the negative line, and the third end of the bridge arm circuit is used to connect the load.

[0022] In some embodiments, a fifth switch is also included, the load includes an inductor component, a first end of the inductor component is connected to a third end of the bridge arm 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.

[0023] In some embodiments, a sixth switch is also included, which is connected to the negative line, and the first end of the sixth switch is connected to the first end of the energy storage unit, and the second end of the sixth switch is adapted to be connected to a charging pile.

[0024] Secondly, this application provides a method for detecting the switching sintering of a charging and discharging circuit, including the charging and discharging circuit as provided in any of the above embodiments, wherein the charging and discharging circuit is applied to a vehicle; the detection method includes:

[0025] When the vehicle is in a high-voltage energized state and is not charging or driving, the first switch and the fifth switch of the charging and discharging circuit are in different on / off states.

[0026] The detection unit that controls the charging and discharging circuit detects the voltage across the first capacitor of the charging and discharging circuit.

[0027] The sintering state of the first switch or the fifth switch of the charging and discharging circuit is determined by the voltage detected by the detection unit of the charging and discharging circuit.

[0028] The beneficial effects of the second aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0029] In some embodiments, when the first switch is on and the fifth switch is off, the control detection unit performs detection after the upper bridge arm of the bridge arm circuit of the control circuit is turned on.

[0030] If the voltage detected by the detection unit is greater than the preset voltage, then the fifth switch is determined to be sintered.

[0031] In some embodiments, the fifth switch of the charging and discharging circuit is in a sintering state, limiting the vehicle speed to a preset speed range and issuing a speed limit alarm signal.

[0032] In some embodiments, when the fifth switch is on and the first switch is off, the upper bridge arm of the bridge arm circuit of the control circuit is turned on, and the control detection unit performs detection.

[0033] If the voltage detected by the detection unit is greater than the preset voltage, then the first switch is determined to be sintered.

[0034] In some embodiments, the first switch of the charging and discharging circuit is in a sintering state, limiting the vehicle speed to a preset speed range and issuing a speed limit alarm signal.

[0035] Thirdly, this application provides a controller, which includes: a processor and a memory for storing processor-executable instructions; wherein the processor is configured to: execute the steps of the switching sintering detection method of the charging and discharging circuit described in the above embodiments.

[0036] The beneficial effects of the third aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0037] Fourthly, this application provides a vehicle including a charging / discharging circuit as provided in any of the above embodiments, or a controller as provided in the above embodiments.

[0038] The beneficial effects of the fourth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0039] Fifthly, this application provides a computer-readable storage medium storing computer instructions that, when executed on a processor, cause the processor to perform a switching sintering detection method for a charging / discharging circuit as provided in any of the above embodiments.

[0040] The beneficial effects of the fifth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0041] Sixthly, this application provides a computer program product comprising a computer program that, when run on a computer, causes the computer to execute the switching sintering detection method for the charging and discharging circuit provided in any of the above embodiments.

[0042] The beneficial effects of the sixth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a vehicle drive system in related technologies;

[0045] Figure 2 A topology diagram of a charging and discharging circuit provided in an embodiment of this application;

[0046] Figure 3 A flowchart illustrating a control method for a charging and discharging circuit provided in an embodiment of this application;

[0047] Figure 4 A flowchart of a switching sintering detection method for a charging and discharging circuit provided in an embodiment of this application;

[0048] Figure 5 A flowchart of a switching sintering detection processing method for a charging and discharging circuit provided in this application embodiment;

[0049] Figure 6 This is a structural diagram of a vehicle provided in an embodiment of this application.

[0050] Reference numerals: 100, charging / discharging circuit; 1, switching 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 cell; 22, second battery cell; 3, energy storage unit; 4, inverter circuit; 40, bridge arm circuit; 41, first bridge arm circuit; 411, first terminal of the first bridge arm circuit; 412, second terminal of the first bridge arm circuit; 413, third terminal of the first bridge arm circuit; 42, second bridge arm circuit; 421, first terminal of the second bridge arm circuit; 422, second terminal of the second bridge arm circuit; 423, second... 43. Third bridge arm circuit; 431. First bridge arm circuit; 432. Second bridge arm circuit; 433. Third bridge arm circuit; 5. First DC bus; 6. Negative line; 61. Second DC bus; 62. Second charging line; 7. Load; 8. Charging / discharging interface; 81. First end of charging / discharging interface; 82. Second end of charging / discharging interface; C1. First capacitor; C2. Second capacitor; L1. Inductor assembly; 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

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of the invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0056] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0057] With the rapid development of new energy vehicles and the widespread use of electric vehicles, the demand for the overall power of electric vehicles is also increasing.

[0058] Currently, increasing the overall power of electric vehicles is mainly achieved by increasing the voltage of the electric vehicle's power supply to reduce the supply current. However, as the voltage increases, problems such as decreased motor drive efficiency may arise. For example, if an electric vehicle uses a high-voltage power supply to directly drive the motor, and this drive voltage cannot be switched, then the drive efficiency of the electric vehicle will decrease when the power supply voltage is high.

[0059] Reference Figure 1 , Figure 1 This is a schematic diagram of a vehicle drive system in the related technology, including a power transmission unit 500 and an external device 600. 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, the external device 600 is a charging pile, during insulation detection, the Y capacitor of the vehicle's high-voltage circuit can be connected in parallel through the voltage sampling circuit at both ends of the capacitor 210. This causes the capacitance value of the insulation detection circuit to increase, which can easily trigger insulation detection failure, increasing costs and increasing the risk of hardware failure.

[0060] Based on this, embodiments of this application also provide a charging and discharging circuit 100, referring to... Figure 2 The charging and discharging circuit 100 includes a first branch 11, a switching unit 1, and a capacitive unit 9. The first branch 11 is connected between the first charging line 10 and the negative line 6, which are adapted to connect to the charging pile 300. The first end of the capacitive unit 9 is connected to the ground terminal, and the second end of the capacitive unit 9 is connected to the negative line 6. The switching unit 1 is connected between the second end of the capacitive unit 9 and the first end of the first charging line 10, which is the end of the first charging line 10 connected to the charging pile 300. When the switching unit 1 is in the off state, it is used to realize the insulation detection of the charging pile 300.

[0061] For example, one end of the first charging cable 10 is connected to the charging pile 300, and a switch unit 1 is connected between it and the second end of the capacitive unit 9. That is to say, the switch unit 1 can be set on the first charging cable 10, and similarly, it can also be set on the negative line 6 or on the first branch 11. The specific location of the switch unit 1 is not limited here.

[0062] In some embodiments, the switching unit 1 is connected between the second end of the capacitive unit 9 and the first end of the first branch 11, and the first end of the first branch 11 is the end of the first branch 11 connected to the negative line 6.

[0063] In some embodiments, the switch unit 1 is connected between the first end of the first branch 11 and the second end of the first branch 11, and the second end of the first branch 11 is the end of the first branch 11 connected to the first charging cable 10.

[0064] 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 cable 10.

[0065] It should be noted that the aforementioned switch unit 1 can be connected to any position in the circuit formed by the first charging line 10, the first branch 11, and the negative line 6, without any specific limitation.

[0066] Based on the above solution, some embodiments of this application provide a charging and discharging circuit 100, which includes a switching unit 1. By controlling the state of the switching unit 1, for example, when the switching unit 1 is in the off state, the problem of insulation detection failure can be avoided. It should be noted that the capacitive unit 9 includes a Y capacitor. Specifically, when the switching unit 1 is in the off state, the capacitive unit 9 can be isolated from the charging pile 300, preventing the capacitive unit 9 from being connected to the insulation detection circuit. That is, the capacitive unit 9 and the charging pile 300 are in a disconnected state, thereby avoiding the problem of insulation detection failure of the charging pile 300.

[0067] It should be noted that, for example, B1 / B0 in the accompanying drawings of this disclosure indicates that component B1 belongs to component B0, and other similar reference numerals in the drawings also follow the above explanation.

[0068] 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 switching unit 1, and the second end of the switching unit 1 is connected to the first charging line 10.

[0069] In some embodiments, continue to refer to Figure 2 The first branch 11 also includes a detection unit 400, the first end of which is connected to the first end of the energy storage unit 3, and the second end of which is connected to the second end of the energy storage unit 3.

[0070] It is understood that the above connection relationship allows the energy storage unit 3 and the detection unit 400 to be connected in parallel. The energy storage unit 3 can be used to store electrical energy.

[0071] For example, when performing insulation testing on the charging pile 300, and with the switch unit 1 on, a circuit can be formed between the first charging line 10, the switch unit 1, the detection unit 400, and the capacitive unit 9. In other words, the detection unit 400 is equivalent to a wire being connected to the detection circuit, causing the insulation testing of the charging pile 300 to fail. Therefore, in this application, the switch unit 1 is set to be in an open state during the insulation testing process. That is, at this time, the first charging line 10, the switch unit 1, the detection unit 400, and the capacitive unit 9 are in an open circuit state, to prevent the capacitive unit 9 from being connected to the insulation testing circuit. That is, the capacitive unit 9 and the charging pile 300 are in a disconnected state, so as to avoid the problem of insulation testing failure of the charging pile 300.

[0072] In some embodiments, such as Figure 2 As 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.

[0073] In some embodiments, such as Figure 2 As 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.

[0074] For example, the number of first switches K1 is not limited; there may be only one or more. For instance, if there are two first switches K1 connected in parallel, the other first switch K1 can be controlled when one of the first switches K1 fails, ensuring the effectiveness of the first switches K1 during insulation detection and charging / discharging.

[0075] For example, the first switch K1 and the first capacitor C1 are connected in parallel across the charging and discharging interface of the charging and discharging circuit 100. That is, the first switch K1 can independently control the on / off state of the first capacitor C1. Figure 2 As shown, the first switch K1 and the first capacitor C1 form a branch.

[0076] In some embodiments, such as Figure 2 As shown, the first terminal of the first capacitor C1 is connected to the negative line 6, and the second terminal of the first capacitor C1 is connected to the first terminal of the first switch K1.

[0077] As can be seen from the foregoing description, this is merely an example of a series connection between the first capacitor C1 and the first switch K1, and is not specifically limited.

[0078] In some embodiments, the capacitive unit 9 includes a third capacitor 91, with 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.

[0079] It should be noted that the capacitive unit 9 mentioned above is a safety capacitor, also known as a Y capacitor.

[0080] In some embodiments, continue to refer to Figure 2 The charging and discharging circuit 100 also 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 also used to connect the first end of the load 7, and the second end of the load 7 is connected to the first charging line 10.

[0081] For example, the load 7 mentioned above can be a motor.

[0082] It should be noted that, as described above, the second terminal of load 7 is connected to the negative line 6 via a switching unit 1 and an energy storage unit 3. (Refer to...) Figure 2 The second end of the load 7 is connected to the first charging line 10. That is, the switching unit 1 can be located between the second end of the load 7 and the energy storage unit 3, or between the negative line 6 and the energy storage unit 3; no specific limitation is made here. For ease of explanation, some embodiments in this application... Figure 2 The following is an example of how the switching unit 1 can be set at the second end of the load 7 and the energy storage unit 3.

[0083] In some embodiments, refer to Figure 2 The power supply 2 includes at least a first battery unit 21 and a second battery unit 22. The positive terminal of the first battery unit 21 is connected to the first DC bus 5, the negative terminal of the first battery unit 21 is connected to the positive terminal of the second battery unit 22, and the negative terminal of the second battery unit 22 is connected to the negative line 6.

[0084] It is understandable that the above connection can connect the first battery unit 21 and the second battery unit 22 in series, thereby increasing the voltage across the power supply 2.

[0085] Exemplary embodiments are merely examples. Specifically, when the power supply 2 includes multiple battery cells, all battery cells can be connected in series or in parallel. Alternatively, some battery cells can be connected in series and then in parallel with the remaining battery cells. These are not elaborated upon here, nor are they specifically limited. In practical applications, the number of battery cells can be selected based on needs and cost considerations. It should also be noted that as the number of battery cells increases, the voltage of the power supply 2 can change according to the series and parallel connections between the battery cells. That is, as the number of battery cells increases, the voltage range that the power supply 2 can adjust is larger, thereby improving the voltage adaptability of the power supply 2 during charging.

[0086] Understandably, when multiple battery cells are connected in series and parallel, attention needs to be paid to the voltage matching relationship between the battery cells. For example, when two 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 a large voltage difference between the two battery cells, which would cause the battery with the higher voltage to charge the battery with the lower voltage.

[0087] In some embodiments, refer to Figure 2 The charging and discharging circuit 100 also includes a second switch K2, which is connected to the first DC bus 5 and located between the power supply 2 and the inverter circuit 4.

[0088] The charging and discharging circuit 100 also includes a third switch K3 and a first resistor R1, which are connected in series between the power supply 2 and the inverter circuit 4.

[0089] For example, the third switch K3 is connected in series with the first resistor R1, and the third switch K3 and the first resistor R1 connected in series are connected in parallel with the second switch K2.

[0090] In some embodiments, refer to Figure 2 When the second switch K2 is on and the third switch K3 is off, the power supply 2 is connected to the inverter circuit 4 to form a power supply circuit; when the second switch K2 is off and the third switch K3 is on, the power supply 2 is connected to the first resistor R1 and the inverter circuit 4 to form a pre-charge circuit.

[0091] In some embodiments, continue to refer to Figure 2 The charging and discharging circuit 100 also includes a fourth switch K4, which is connected to the negative line 6 and is located between the power supply 2 and the inverter circuit 4.

[0092] For example, the third switch K3 is a positive contactor, and / or the fourth switch K4 is a negative contactor.

[0093] In the charging and discharging circuit 100, multiple batteries in the power supply 2 can power the inverter circuit 4 and the load 7. (Refer to...) Figure 2 The multiple power sources 2 in the charging and discharging circuit 100 include two batteries, which is only an example and is not specifically limited.

[0094] 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.

[0095] For example, before charging the power supply 2, the second switch K2 needs to be turned off, and the third switch K3 and the fourth switch K4 need to be turned on. The power supply 2 precharges the second capacitor C2. After the second capacitor C2 is fully charged or nearly fully charged, the third switch K3 is turned off, the second switch K2 and the fourth switch K4 are turned on, and other switches in the switch unit 1 are turned on to achieve the purpose of charging the power supply 2. This can avoid damage to electronic devices caused by voltage jumps during the charging process of the charging pile 300 directly charging the power supply 2, thereby achieving the purpose of protecting electronic devices.

[0096] 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 the load 7.

[0097] For example, 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 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 the load 7, wherein the load 7 can be a motor winding.

[0098] For example, 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 windings can work normally.

[0099] The aforementioned configuration includes a first bridge arm circuit 41 and a second bridge arm circuit 42, with the third terminals 413 and 423 of both the first and second bridge arm circuits connected to the motor windings. In this configuration, the load 7 is the motor windings. That is, when the power supply 2 drives the motor windings, by switching 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 windings, from the third terminal 423 of the second bridge arm circuit to the second terminal 422 of the second bridge arm circuit, and then returns to the power supply 2 via the negative line 6, thus forming a drive loop. It should be noted that when only one first bridge arm circuit 41 is configured in the inverter circuit 4, the current, after flowing through the motor windings via the third terminal 413 of the first bridge arm circuit, can also return to the power supply 2 via the second terminal 412 of the first bridge arm circuit, forming a drive loop.

[0100] In some embodiments, refer to Figure 2 The inverter circuit 4 also includes a third bridge arm circuit 43. The first end 431 of the third bridge arm circuit is connected to the first DC bus 5, the second end 432 of the third bridge arm circuit is connected to the negative line 6, and the third end 433 of the third bridge arm circuit is used to connect the motor windings.

[0101] For example, refer to Figure 2 The third terminal 433 of the third bridge arm circuit in the inverter circuit 4 is used to connect the motor winding. That is, in the drive circuit, the current flows from the first terminal 411 of the first bridge arm circuit to the third terminal, and after flowing through the motor winding, it can return to the power supply 2 through the third terminal 433 of the third bridge arm circuit to form the drive circuit.

[0102] In some embodiments, a fifth switch K5 is also included, the load 7 includes an inductor component L1, the first end of the inductor component L1 is connected to the third end 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, and the second end of the fifth switch K5 is connected to the first end of the switch unit 1.

[0103] For example, the third terminal of the bridge arm circuit 40 here can be any one of the first bridge arm circuit 41, the second bridge arm circuit 42, and the third bridge arm circuit 43 described above.

[0104] For example, the inductor component L includes a first inductor, a second inductor and a third inductor, wherein the first end of the first inductor is connected to the third end 413 of the first bridge arm circuit, the first end of the second inductor is connected to the third end 423 of the second bridge arm circuit, and the first end of the third inductor is connected to the third end 433 of the third bridge arm circuit.

[0105] In some embodiments, continue to refer to Figure 2The charging and discharging circuit 100 also includes a charging and discharging interface 8. The first end 81 of the charging and discharging interface 8 is electrically connected to the first charging line 10, and the second end 82 of the charging and discharging interface 8 is connected to the negative line 6. The charging and discharging interface 8 is adapted to be connected to the load 7 or the charging pile 300.

[0106] For example, the charging and discharging interface 8 includes a first end 81 and a second end 82. The first end 81 of the charging and discharging interface 8 is electrically connected to the first charging cable 10, and the first end 81 of the charging and discharging interface 8 is used to connect to the positive terminal of the charging pile 300. The second end of the charging and discharging interface 8 is used to connect to the negative terminal of the charging pile 300. The first DC bus 5 receives the positive signal of the charging pile 300 through the first end 81 of the charging and discharging interface 8, and the negative line 6 transmits the electrical signal to the negative terminal of the charging pile 300 through the second end 82 of the charging and discharging interface 8.

[0107] In some embodiments, continue to refer to Figure 2 The charging and discharging circuit 100 also includes a sixth switch K6, which is connected to the negative line 6. 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 charging and discharging interface.

[0108] For example, 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 charging and discharging interface to the motor winding to charge the motor winding.

[0109] For example, during the charging 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.

[0110] For example, 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 charging and discharging interface 8.

[0111] In this embodiment, by controlling the on / off state of multiple switches and the on / off state of the upper and lower bridge transistors in the inverter circuit 4, a charging / discharging circuit 100 can switch between three modes: drive control mode, direct charging mode, and buck-boost charging mode. The charging / discharging circuit 100 has a simple structure, small size, and low cost, and can meet different needs.

[0112] It should be noted that the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 mentioned above can all be contactor switches.

[0113] It should be noted that the negative line 6 in this application includes a second DC bus 61 and a second charging line 62 connected together. The first end of the second DC bus 61 is connected to the negative terminal of the power supply 2, and the second end of the second DC bus 61 is connected to the second terminal 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 connect to the negative terminal of the charging pile 300. The first end of the first DC bus 5 in this application is connected to the positive terminal of the power supply, and the second end of the first DC bus 5 is connected to the first terminal of the inverter circuit 4. The first end of the first charging line 10 is connected to the second terminal of the load 7, and the second end of the first charging line 10 is adapted to connect to the positive terminal of the charging pile 300.

[0114] Reference Figure 3 and combined Figure 2 The embodiments of this application also provide a control method for a charging and discharging circuit 100, including the charging and discharging circuit 100 as provided in any of the above embodiments; the control method includes:

[0115] S1. After the charging and discharging circuit 100 receives the DC charging signal, if the voltage at both ends of the charging and discharging interface 8 of the charging and discharging circuit 100 is less than the preset voltage, and the charging and discharging circuit 100 can receive the data signal from the charging pile 300, the first switch K1 and the fifth switch K5 of the charging and discharging circuit 100 are controlled to be turned on to form a pre-charging circuit or a power supply circuit.

[0116] S2. After the charging and discharging circuit 100 receives the DC charging completion signal, it controls the first switch K1 and the fifth switch K5 of the charging and discharging circuit 100 to open.

[0117] It should be noted that the aforementioned data signal can be a Charge Request Message (CPM) message, which describes the charging pile 300 sending a charging request to the electric vehicle. The aforementioned preset voltage is a safe voltage during the charging process. For example, the safe voltage is 60V.

[0118] Understandably, after completing the DC charging process, active discharge is required to avoid electric shock to the operator. This involves reducing the voltage at the charging / discharging interface 8 to below 60V, and then disconnecting the first switch K1 and the fifth switch K5.

[0119] In some embodiments, after the charging and discharging circuit 100 receives the DC charging completion signal, that is, after the charging and discharging circuit 100 exits the DC charging process, the first switch K1 and the fifth switch K5 are disconnected after a first interval. Here, the first interval can be 3 seconds. This is just an example. During the first interval, the internal components of the charging and discharging circuit 100 will consume each other until the voltage of the charging and discharging interface 8 drops below 60V to reduce safety risks.

[0120] The above control method executes corresponding actions by judging the status of the vehicle and the charging pile 300, which can avoid arcing caused by the contactor being engaged or disengaged due to pressure difference, which would eventually lead to the contactor being sintered and cause unnecessary damage to the controller 200.

[0121] It should also be noted that when the first switch K1 and the fifth switch K5 are turned on, the flag bits of the switches are simultaneously recorded as valid.

[0122] Reference Figure 4 Combination Figure 2 The embodiments of this application also provide a method for detecting the switching sintering of a charging and discharging circuit 100, including the charging and discharging circuit 100 provided in any of the above embodiments, wherein the charging and discharging circuit 100 is applied to a vehicle.

[0123] The detection methods include:

[0124] T1. Determine the vehicle status and determine that the vehicle status is the first state, which is the high-voltage power-on state of the vehicle and is a non-charging and non-driving state; control the first switch K1 and the fifth switch K5 of the charging and discharging circuit 100 to be in different conduction states.

[0125] T2. The detection unit 400 of the control charging and discharging circuit 100 detects the voltage across the first capacitor C1 of the charging and discharging circuit 100.

[0126] T3. Determine the sintering state of the first switch K1 or the fifth switch K5 of the charging and discharging circuit 100 based on the voltage detected by the detection unit 400 of the charging and discharging circuit 100.

[0127] It should be noted that the detection unit of the charging and discharging circuit is configured to detect the voltage across the first capacitor. The above-mentioned setting of only one detection unit, in addition to having a detection function, can also reduce production costs compared with related technologies. At the same time, setting only one detection unit can meet the conditions for detecting sintering.

[0128] The above method can determine the current status of the vehicle and start the sintering test process, avoiding interference with the drive or charging functions, which could lead to sintering test failure or misjudgment.

[0129] In some embodiments, refer to Figure 4 and combined Figure 1 The switching sintering test method for the charging / discharging circuit 100 includes:

[0130] T11. Control the first switch K1 to be turned on and the fifth switch K5 to be turned off, and record the first switch being activated and the mark as valid; after the upper bridge arm of the bridge arm circuit 40 of the charging and discharging circuit 100 is turned on, control the detection unit to perform detection.

[0131] T12. Determine whether the voltage detected by the detection unit is greater than the preset voltage;

[0132] T13. If yes, then confirm that the fifth switch K5 is sintered; if no, then confirm that the fifth switch K5 is not sintered.

[0133] In some embodiments, the fifth switch K5 of the charging and discharging circuit 100 is in a sintering state, limiting the vehicle speed to a preset speed range and issuing a speed limit alarm signal.

[0134] In other embodiments, the switching sintering detection method of the charge / discharge circuit 100 includes:

[0135] T21. Control the fifth switch K5 to be turned on, the first switch K1 to be turned off, and record that the fifth switch K5 has been activated and the mark is valid; after the upper bridge arm of the bridge arm circuit 40 of the charging and discharging circuit 100 is turned on, control the detection unit to perform detection.

[0136] T22. Determine whether the voltage detected by the detection unit is greater than the preset voltage;

[0137] T23. If yes, then confirm that the first switch K1 is sintered; if no, then confirm that the first switch K1 is not sintered.

[0138] It should be noted that, referring to Figure 4 During the sintering detection process, the first switch K1 and the fifth switch K5 are controlled to close, which in turn controls the upper bridge arm of the inverter circuit 4 to conduct, closing the second switch K2 and the fourth switch K4. The sintering status of the other switch is determined by detecting the voltage across the first capacitor C1 through the detection unit. Figure 4 As can be seen, only one switch is detected in each vehicle power-on cycle. The sintering status of the first switch K1 and the fifth switch K5 are detected in sequence according to this cycle. This can reduce the time for the indicator light to light up when the vehicle is powered on, and also reduce the risk of sintering caused by detection. At the same time, compared with related technologies, it can reduce the number of detection units, which can save the cost of related hardware and reduce the risk of failure of this part of the hardware.

[0139] In some embodiments, the first switch K1 of the charging and discharging circuit 100 is in a sintering state, limiting the vehicle speed to a preset speed range and issuing a speed limit alarm signal.

[0140] In other embodiments, if the first switch K1 of the charging / discharging circuit 100 and / or the fifth switch K5 of the charging / discharging circuit 100 fails to complete the sintering detection, the vehicle speed is limited to a preset speed range.

[0141] For example, if the first switch K1 of the charging / discharging circuit 100 and the fifth switch K5 of the charging / discharging circuit 100 have not completed the sintering detection, the vehicle speed is limited to a preset vehicle speed range.

[0142] For example, if the first switch K1 of the charging and discharging circuit 100 is detected to be in a sintering state and the fifth switch K5 of the charging and discharging circuit 100 has not completed the sintering detection, the vehicle speed is limited to a preset vehicle speed range and a speed limit alarm signal is issued.

[0143] For example, if the first switch K1 of the charging and discharging circuit 100 is detected to have not completed the sintering detection and the fifth switch K5 of the charging and discharging circuit 100 is in the sintering state, the vehicle speed is limited to a preset vehicle speed range and a speed limit alarm signal is issued.

[0144] In some embodiments, during the insulation testing of the charging pile, and before executing the command to disconnect the first switch K1, the sintering test 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 testing of the charging pile, the first switch K1 can play the role of preventing the third capacitor 91 (Y capacitor) from being connected.

[0145] Reference Figure 5 and combined Figure 2 The embodiments of this application also provide a method for detecting the switching sintering of a charging and discharging circuit 100, including the charging and discharging circuit 100 provided in any of the above embodiments.

[0146] The above processing methods include:

[0147] P1. Determine whether the fifth switch K5 is sintered;

[0148] P2. If so, limit the vehicle speed to within the preset speed range and issue a speed limit alarm signal;

[0149] P3. If not, determine whether the sintering detection of the first switch K1 is complete;

[0150] P4. If not, continue to limit the vehicle speed to the preset speed range and issue a speed limit warning signal;

[0151] P5. If yes, determine whether the first switch K1 is sintered;

[0152] P6. If so, continue to limit the vehicle speed to within the preset speed range and issue a speed limit alarm signal;

[0153] P7. If not, cancel the speed limit to the preset speed range and cancel the speed limit alarm signal.

[0154] It should be noted that the preset speed is 60 km / h, and the speed limit warning signal is sent to the vehicle's instrument panel, meaning the instrument panel displays the speed limit warning signal. The speed limit is within the preset speed range, which can be in a stopped state (0 km / h) or in a moving state (within the 60 km / h range).

[0155] The above-mentioned switch sintering treatment method of the charging and discharging circuit 100 can avoid hardware damage caused by contactor sintering under driving conditions, and at the same time remind the driver that the current fault mode is in place, requiring careful driving and vehicle maintenance.

[0156] Reference Figure 6 The embodiments of this application also provide a controller 200, which includes a processor and a memory for storing processor-executable instructions; wherein the processor is configured to: execute the steps of the control method of the charge-discharge circuit 100 provided in the above embodiments, and / or the steps of the switch sintering detection method of the charge-discharge circuit 100 provided in the above embodiments, and / or the steps of the switch sintering processing method of the charge-discharge circuit 100 provided in the above embodiments. Therefore, the controller 200 provided by the present invention has all the beneficial effects of the methods of the charge-discharge circuit 100 provided in any of the above embodiments, which will not be elaborated here.

[0157] For example, the processor can be a central processing unit (CPU), or 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. The general-purpose processor can be a microprocessor or any conventional processor.

[0158] The memory can be read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited to these. The memory can exist independently and be connected to the processor via a communication bus. The memory can also be integrated with the processor.

[0159] Reference Figure 6 The embodiments of this application also provide a vehicle 1000, including the charging and discharging circuit 100 provided in the above embodiments. Therefore, the charging and discharging circuit 100 provided by the present invention has all the beneficial effects of the charging and discharging circuit 100 provided in any of the above embodiments, which will not be elaborated here.

[0160] Embodiments of this application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the control method for the charging / discharging circuit 100 provided in the above embodiments, and / or the switch sintering detection method for the charging / discharging circuit provided in any of the above embodiments, and / or the switch sintering processing method for the charging / discharging circuit provided in any of the above embodiments. Therefore, the computer-readable storage medium provided by this invention possesses all the beneficial effects of the control method for the charging / discharging circuit 100 provided in any of the above embodiments, and / or the switch sintering detection method for the charging / discharging circuit 100 provided in any of the above embodiments, and / or the switch sintering processing method for the charging / discharging circuit 100 provided in any of the above embodiments, which will not be elaborated upon here.

[0161] Embodiments of this application also provide a computer program product, including a computer program that, when run on a computer, causes the computer to execute the control method for the charging / discharging circuit 100 as provided in the above embodiments, and / or the switch sintering detection method for the charging / discharging circuit 100 as provided in any of the above embodiments, and / or the switch sintering processing method for the charging / discharging circuit 100 as provided in any of the above embodiments. Therefore, the computer program product provided by this invention possesses all the beneficial effects of the control method for the charging / discharging circuit 100 provided in any of the above embodiments, and / or the switch sintering detection method for the charging / discharging circuit 100 provided in any of the above embodiments, and / or the switch sintering processing method for the charging / discharging circuit 100 provided in any of the above embodiments, which will not be elaborated upon here.

[0162] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0163] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A charging and discharging circuit (100), characterized in that, include: The first branch (11) is connected between the first charging line (10) and the negative line (6), and the first charging line (10) and the negative line (6) are adapted to be connected to the charging pile (300). A capacitive unit (9) is provided, with its first end connected to a ground terminal and its second end connected to the negative line (6). A switching unit (1) is connected between the second end of the capacitive unit (9) and the first end of the first charging line (10), wherein the first end of the first charging line (10) is the end of the first charging line (10) connected to the charging pile (300); When the switch unit (1) is in the off state, it is used to realize the insulation detection of the charging pile (300).

2. The charging and discharging circuit (100) according to claim 1, characterized in that, The switching unit (1) is connected between the second end of the capacitive unit (9) and the first end of the first branch (11), and the first end of the first branch (11) is the end of the first branch (11) connected to the negative line (6).

3. The charging and discharging circuit (100) according to claim 1, characterized in that, The switch unit (1) is connected between the first end of the first branch (11) and the second end of the first branch (11). The first end of the first branch (11) is the end of the first branch (11) connected to the negative line (6), and the second end of the first branch (11) is the end of the first branch (11) connected to the first charging line (10).

4. The charging and discharging 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), and the second end of the first branch (11) is the end of the first branch (11) connected to the first charging line (10).

5. The charging and discharging circuit (100) according to claim 3, characterized in that, The first branch (11) includes: Energy storage unit (3), the first end of the energy storage unit (3) is connected to the negative electrode line (6), the second end of the energy storage unit (3) is connected to the first end of the switching unit (1), and the second end of the switching unit (1) is connected to the first charging line (10).

6. The charging and discharging circuit (100) according to claim 5, characterized in that, The first branch (11) also includes: The detection unit (400) has a first end connected to the first end of the energy storage unit (3) and a second end connected to the second end of the energy storage unit (3).

7. The charging and discharging circuit (100) according to claim 5, characterized in that, 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).

8. The charging and discharging circuit (100) according to claim 5, characterized in that, The switching unit (1) includes a first switch (K1), the first end of the first switch (K1) serves as the first end of the switching unit (1), and the second end of the first switch (K1) serves as the second end of the switching unit (1).

9. The charging and discharging circuit (100) according to claim 1, characterized in that, 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).

10. The charging and discharging circuit (100) according to claim 1, characterized in that, The charging and discharging circuit (100) further includes: Power supply (2) and inverter circuit (4); 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 also used to connect the first end of the load (7), and the second end of the load (7) is connected to the first charging line (10).

11. The charging and discharging circuit (100) according to claim 10, characterized in that, The power source (2) includes at least a first battery unit (21) and a second battery unit (22). The positive terminal of the first battery unit (21) is connected to the first DC bus (5), the negative terminal of the first battery unit (21) is connected to the positive terminal of the second battery unit (22), and the negative terminal of the second battery unit (22) is connected to the negative line (6).

12. The charging and discharging circuit (100) according to claim 10, characterized in that, Also includes: 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).

13. The charging and discharging circuit (100) according to claim 10, characterized in that, Also includes: The third switch (K3) and the first resistor (R1) are connected in series between the power supply (2) and the inverter circuit (4).

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

15. The charging and discharging circuit (100) according to claim 10, characterized in that, 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).

16. The charging and discharging circuit (100) according to claim 10, characterized in that, 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).

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

18. The charging and discharging circuit (100) according to claim 5, characterized in that, It also includes a sixth switch (K6), which is connected to the negative line (6), and the first end of the sixth switch (K6) is connected to the first end of the energy storage unit (3), and the second end of the sixth switch (K6) is adapted to be connected to the charging pile (300).

19. A method for detecting the switching sintering of a charging and discharging circuit (100), characterized in that, The charging and discharging circuit (100) as described in any one of claims 1 to 18 is applied to a vehicle; The method includes: When the vehicle is in a high-voltage powered state and is not in a charging or driving state, the first switch (K1) and the fifth switch (K5) of the charging and discharging circuit (100) are in different on / off states. The detection unit (400) that controls the charging and discharging circuit (100) detects the voltage across the first capacitor (C1) of the charging and discharging circuit (100); The sintering state of the first switch (K1) or the fifth switch (K5) of the charging and discharging circuit (100) is determined based on the voltage detected by the detection unit (400) of the charging and discharging circuit (100).

20. The method for detecting the switching sintering of the charging and discharging 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, the upper bridge arm of the bridge arm circuit (40) of the charging and discharging circuit (100) is turned on, and the detection unit (400) is controlled to perform detection. If the voltage detected by the detection unit (400) is greater than the preset voltage, then the fifth switch (K5) is determined to be sintered.

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

22. The method for detecting the switching sintering of the charging and discharging 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, the upper bridge arm of the bridge arm circuit (40) of the charging and discharging circuit (100) is turned on, and the detection unit (400) is controlled to perform detection. If the voltage detected by the detection unit (400) is greater than the preset voltage, then it is determined that the first switch (K1) is sintered.

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

24. The method for detecting the switching sintering of the charging and discharging circuit (100) according to claim 19, characterized in that, If the first switch (K1) of the charging / discharging circuit (100) and / or the fifth switch (K5) of the charging / discharging circuit (100) fails to complete the sintering detection, the vehicle speed is limited to a preset range.

25. A controller (200), characterized in that, The controller (200) includes: a processor and a memory for storing processor-executable instructions; wherein the processor is configured to: perform the steps of the switching sintering detection method of the charge-discharge circuit (100) as described in any one of claims 19 to 24.

26. A vehicle (1000), characterized in that, It includes the charging / discharging 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 that, when executed on a processor, cause the processor to perform the switching sintering detection method of the charge-discharge circuit (100) as described in any one of claims 19 to 24.

28. A computer program product, characterized in that, The computer program product includes a computer program that, when run on a computer, causes the computer to perform the switching sintering detection method of the charge-discharge circuit (100) as described in any one of claims 19 to 24.

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