Fault detection method and device of heating switch, vehicle, storage medium and product

Abstract

The present disclosure relates to a fault detection method and device of a heating switch, a vehicle, a storage medium and a product, and relates to the technical field of fault detection. The heating switch is arranged in a pulse heating circuit in a pulse heating system. The pulse heating system further includes a battery pack and an insulation monitoring circuit. The two ends of the insulation monitoring circuit are respectively connected to the positive and negative poles of the battery pack. The first end of the pulse heating circuit is connected to the midpoint of the battery pack. The second and third ends of the pulse heating circuit are respectively connected to the positive and negative poles of the battery pack. The method includes: determining a fault detection result of the heating switch according to the voltage of the circuit in which the heating switch is located, the midpoint voltage of the battery pack and the battery voltage of the battery pack collected by the insulation monitoring circuit, thereby improving the accuracy of the fault detection result of the heating switch.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of fault detection, and in particular to a fault detection method and device of a heating switch, a vehicle, a storage medium and a product. BACKGROUND

[0002] For a lithium ion battery, the charging and discharging performance at low temperature will decrease obviously. In the related technology, the self-heating of the battery pack can be realized by the method of pulse self-heating. Before the battery pack is heated by the method of pulse self-heating, the fault detection of the heating switch in the pulse heating circuit is needed. SUMMARY

[0003] In order to overcome the problem of inaccurate fault detection of the heating switch in the related technology, the present disclosure provides a fault detection method and device of a heating switch, a vehicle, a storage medium and a product. Based on the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack, and combined with the battery voltage of the battery pack collected by the insulation monitoring circuit, the accuracy of the fault detection of the heating switch can be improved.

[0004] According to a first aspect of an embodiment of the present disclosure, a fault detection method of a heating switch is provided. The heating switch is arranged in a pulse heating circuit in a pulse heating system. The pulse heating system further includes a battery pack and an insulation monitoring circuit. The two ends of the insulation monitoring circuit are connected to the positive and negative electrodes of the battery pack, respectively. The first end of the pulse heating circuit is connected to the midpoint of the battery pack. The second and third ends of the pulse heating circuit are connected to the positive and negative electrodes of the battery pack, respectively. The method includes:

[0005] According to the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit, the fault detection result of the heating switch is determined.

[0006] In the present embodiment, based on the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack, and combined with the battery voltage of the battery pack collected by the insulation monitoring circuit, the problem of inaccurate detection result caused by the absolute value of the difference between the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack being less than a preset voltage can be avoided, thereby improving the accuracy of the fault detection of the heating switch.

[0007] In some possible implementation manners, the pulse heating circuit includes a first heating circuit and a second heating circuit, and the heating switch includes a first heating switch and a second heating switch. The first heating switch is arranged in the first heating circuit, and the second heating switch is arranged in the second heating circuit.

[0008] The fault detection result of the heating switch is determined according to the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit, and includes:

[0009] The first fault detection result of the first heating switch is determined according to the voltage of the first heating circuit where the first heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit.

[0010] The second fault detection result of the second heating switch is determined according to the voltage of the second heating circuit where the second heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit.

[0011] In the embodiment, the drive system of the vehicle can include two groups of drive structures, so that in the pulse heating system formed with the battery pack, the pulse heating circuit can include a first heating circuit and a second heating circuit. The heating switch can include a first heating switch and a second heating switch, the first heating switch can be arranged in the first heating circuit, and the second heating switch can be arranged in the second heating circuit, so that the adhesion judgment of the first heating switch and the adhesion judgment of the second heating switch can be performed respectively.

[0012] In some possible embodiments, the fault detection result of the heating switch is determined according to the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit, and includes:

[0013] In the case that the heating switch is turned off and the insulation monitoring circuit is in the first state, the first midpoint voltage of the battery pack and the positive electrode voltage and the negative electrode voltage of the battery pack collected by the insulation monitoring circuit are obtained;

[0014] In the case that the absolute value of the first midpoint voltage is less than a first preset voltage, the insulation monitoring circuit is controlled to be in a second state according to the positive electrode voltage and the negative electrode voltage of the battery pack, and a first voltage of the circuit where the heating switch is located and a second midpoint voltage of the battery pack are obtained, the second state is used to adjust the absolute value of the second midpoint voltage to be greater than the first preset voltage;

[0015] The fault detection result of the heating switch is determined according to the first voltage and the second midpoint voltage.

[0016] In the embodiment, it can be determined whether the absolute value of the first midpoint voltage is greater than the first preset voltage. In the case that the absolute value of the first midpoint voltage is less than the first preset voltage, the determination of whether the heating switch has a sticking fault by heating the first voltage and the first midpoint voltage of the circuit where the heating switch is located can result in inaccurate determination. The insulation monitoring circuit can be controlled to be in the second state based on the positive voltage and the negative voltage of the battery pack, so that the absolute value of the second midpoint voltage obtained is greater than the first preset voltage, and in this case, an accurate fault detection result of the heating switch can be obtained.

[0017] In some possible embodiments, the first state is that the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack;

[0018] The control of the insulation monitoring circuit to be in the second state according to the positive voltage and the negative voltage of the battery pack includes:

[0019] According to the positive voltage and the negative voltage of the battery pack, a target bridge arm resistor in the insulation monitoring circuit is determined;

[0020] The target bridge arm resistor is controlled to be in communication with the battery pack.

[0021] In the embodiment, the first state can be that the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack, that is, in the case that the heating switch is disconnected and the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack, the first midpoint voltage of the battery pack and the positive voltage and the negative voltage of the battery pack collected by the insulation monitoring circuit are obtained. In the case that the absolute value of the first midpoint voltage is less than the first preset voltage, a target bridge arm resistor in the insulation monitoring circuit is determined according to the positive voltage and the negative voltage of the battery pack, and the target bridge arm resistor in the insulation monitoring circuit is controlled to be in communication with the battery pack, so as to adjust the insulation monitoring circuit to the second state, thereby improving the accuracy of the detection result.

[0022] In some possible embodiments, the bridge arm resistor in the insulation monitoring circuit includes a first bridge arm resistor corresponding to the positive voltage and a second bridge arm resistor corresponding to the negative voltage;

[0023] The determination of the target bridge arm resistor in the insulation monitoring circuit according to the positive voltage and the negative voltage of the battery pack includes:

[0024] In the case that the absolute value of the positive voltage is less than or equal to the absolute value of the negative voltage, the first bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor;

[0025] In a case where the absolute value of the positive electrode voltage is greater than the absolute value of the negative electrode voltage, the second bridge arm resistance in the insulation monitoring circuit is determined as the target bridge arm resistance.

[0026] In the embodiment, the bridge arm resistance in the insulation monitoring circuit can include a first bridge arm resistance corresponding to the positive electrode voltage and a second bridge arm resistance corresponding to the negative electrode voltage. In a case where the absolute value of the positive electrode voltage is less than or equal to the absolute value of the negative electrode voltage, the first bridge arm resistance in the insulation monitoring circuit is determined as the target bridge arm resistance, and the first bridge arm resistance can be connected to the battery pack, so as to reduce the absolute value of the positive electrode voltage, thereby increasing the difference between the absolute value of the positive electrode voltage and the absolute value of the negative electrode voltage, so as to enable the absolute value of the obtained second midpoint voltage to be greater than the first preset voltage; in a case where the absolute value of the positive electrode voltage is greater than the absolute value of the negative electrode voltage, the second bridge arm resistance in the insulation monitoring circuit is determined as the target bridge arm resistance, and the second bridge arm resistance can be connected to the battery pack, so as to reduce the absolute value of the negative electrode voltage, thereby increasing the difference between the absolute value of the positive electrode voltage and the absolute value of the negative electrode voltage, so as to enable the absolute value of the obtained second midpoint voltage to be greater than the first preset voltage. Thus, the accuracy of the detection result of the heating switch can be ensured.

[0027] In some possible embodiments, the determining the fault detection result of the heating switch according to the first voltage and the second midpoint voltage comprises:

[0028] In a case where the absolute value of the difference between the first voltage and the second midpoint voltage is less than or equal to a second preset voltage and the duration is greater than a first preset duration, the fault detection result of the heating switch is determined as a first result, and the first result represents that the heating switch has a sticking fault.

[0029] In the embodiment, in a case where the absolute value of the second midpoint voltage is greater than the first preset voltage, the first voltage and the second midpoint voltage can be compared. In a case where the absolute value of the difference between the first voltage and the second midpoint voltage is less than or equal to the second preset voltage and the duration is greater than the first preset duration, it can be determined that the first voltage is equal to or close to the second midpoint voltage due to the sticking fault of the heating switch, and it can be determined that the heating switch has the sticking fault.

[0030] In some possible embodiments, the method further comprises:

[0031] In a case where the heating switch is turned off and the insulation monitoring circuit is in the first state, a second voltage of a circuit in which the heating switch is located is obtained.

[0032] In a case where the absolute value of the first midpoint voltage is greater than or equal to the first preset voltage, a fault detection result of the heating switch is determined according to the second voltage and the first midpoint voltage.

[0033] In the embodiment, in a case where the absolute value of the first midpoint voltage is greater than or equal to the first preset voltage, there is no misjudgment, and the fault detection result of the heating switch can be directly determined based on the second voltage and the first midpoint voltage.

[0034] In some possible embodiments, the determining the fault detection result of the heating switch according to the second voltage and the first midpoint voltage comprises:

[0035] In a case where the absolute value of the difference between the second voltage and the first midpoint voltage is less than or equal to a second preset voltage and the duration is greater than a second preset duration, the fault detection result of the heating switch is determined as a first result, and the first result represents that the heating switch has a sticking fault.

[0036] In the embodiment, in a case where the absolute value of the difference between the second voltage and the first midpoint voltage is less than or equal to a second preset voltage and the duration is greater than a second preset duration, it can be determined that the second voltage is equal to or close to the first midpoint voltage due to the sticking fault of the heating switch, and it can be determined that the heating switch has the sticking fault.

[0037] According to a second aspect of the embodiments of the present disclosure, a fault detection device of a heating switch is provided. The heating switch is arranged in a pulse heating circuit in a pulse heating system. The pulse heating system further includes a battery pack and an insulation monitoring circuit. The two ends of the insulation monitoring circuit are connected to the positive electrode and the negative electrode of the battery pack, respectively. The first end of the pulse heating circuit is connected to the midpoint of the battery pack. The second end and the third end of the pulse heating circuit are connected to the positive electrode and the negative electrode of the battery pack, respectively. The device includes:

[0038] The detection module is configured to determine a fault detection result of the heating switch according to the voltage of the circuit in which the heating switch is arranged, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit.

[0039] In some possible embodiments, the detection module is configured to:

[0040] In a case where the heating switch is disconnected and the insulation monitoring circuit is in a first state, a first midpoint voltage of the battery pack and the positive electrode voltage and the negative electrode voltage of the battery pack collected by the insulation monitoring circuit are obtained.

[0041] in a case where an absolute value of the first midpoint voltage is less than a first preset voltage, controlling the insulation monitoring circuit to be in a second state according to a positive electrode voltage and a negative electrode voltage of the battery pack, and acquiring a first voltage of a circuit in which the heating switch is located and a second midpoint voltage of the battery pack, the second state being used to adjust the absolute value of the second midpoint voltage to be greater than the first preset voltage;

[0042] determining a fault detection result of the heating switch according to the first voltage and the second midpoint voltage.

[0043] In some possible implementation manners, the first state is that a bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack.

[0044] The detection module comprises:

[0045] determining a target bridge arm resistor in the insulation monitoring circuit according to the positive electrode voltage and the negative electrode voltage of the battery pack;

[0046] controlling the target bridge arm resistor to be in communication with the battery pack.

[0047] In some possible implementation manners, the bridge arm resistor in the insulation monitoring circuit comprises a first bridge arm resistor corresponding to the positive electrode voltage and a second bridge arm resistor corresponding to the negative electrode voltage.

[0048] The detection module is configured to:

[0049] in a case where an absolute value of the positive electrode voltage is less than or equal to an absolute value of the negative electrode voltage, determining the first bridge arm resistor in the insulation monitoring circuit as the target bridge arm resistor;

[0050] in a case where the absolute value of the positive electrode voltage is greater than the absolute value of the negative electrode voltage, determining the second bridge arm resistor in the insulation monitoring circuit as the target bridge arm resistor.

[0051] In some possible implementation manners, the detection module is configured to:

[0052] in a case where an absolute value of a difference between the first voltage and the second midpoint voltage is less than or equal to a second preset voltage and a duration is greater than a first preset duration, determining the fault detection result of the heating switch to be a first result, the first result indicating that the heating switch has a sticking fault.

[0053] According to a third aspect of the embodiments of the present disclosure, a fault detection device of a heating switch is provided, comprising:

[0054] a processor;

[0055] a memory for storing processor-executable instructions;

[0056] The processor is configured to perform the steps of the heating switch fault detection method provided by the first aspect of the present disclosure.

[0057] According to a fourth aspect of the embodiments of the present disclosure, a vehicle is provided, comprising the heating switch fault detection apparatus provided by the third aspect of the present disclosure, and the pulse heating system in the heating switch fault detection method provided by the first aspect of the present disclosure.

[0058] According to a fifth aspect of the embodiments of the present disclosure, a computer readable storage medium is provided, having stored thereon computer program instructions which, when executed by a processor, implement the steps of the heating switch fault detection method provided by the first aspect of the present disclosure.

[0059] According to a sixth aspect of the embodiments of the present disclosure, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the heating switch fault detection method provided by the first aspect of the present disclosure.

[0060] It should be understood that the general description above and the following detailed description are only exemplary and explanatory, and are not limiting of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0061] The accompanying drawings, which are incorporated in and form a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

[0062] Figure 1 is a schematic diagram of a pulse heating system according to an exemplary embodiment.

[0063] Figure 2 is a flowchart of a heating switch fault detection method according to an exemplary embodiment.

[0064] Figure 3 is a flowchart of another heating switch fault detection method according to an exemplary embodiment.

[0065] Figure 4 is a block diagram of a heating switch fault detection apparatus according to an exemplary embodiment.

[0066] Figure 5 is a block diagram of another heating switch fault detection apparatus according to an exemplary embodiment.

[0067] Figure 6 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0068] Exemplary embodiments will be described in detail with reference to the drawings, of which examples are shown. In the following description, the same numbers are used to denote the same or similar elements throughout the several figures.

[0069] The implementations described in the following detailed description of some embodiments of the present disclosure are not meant to represent all implementations consistent with the present disclosure. Rather, they are examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0070] It should be noted that all the actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection regulations and policies of the country where the device is located, and with the authorization given by the owner of the corresponding device.

[0071] For lithium-ion batteries, the charge and discharge performance at low temperature will decrease significantly. In the related art, the battery pack can be self-heated by a pulse self-heating method. The method generates a periodic sine wave pulse current, which passes through the battery pack, so as to generate Joule heat through the internal resistance of the battery pack, thereby realizing self-heating of the battery pack.

[0072] In some cases, for example, in the case of using a low-voltage sampling high-voltage scheme, that is, all high-voltage sampling points are referenced to the vehicle body ground, before heating the battery pack by the pulse self-heating method, the heating switch in the pulse heating circuit needs to be detected for faults, such as adhesion detection, so as to ensure that the high-voltage loop can be disconnected when the pulse heating occurs overvoltage. For the high-voltage sampling scheme, the traditional scheme is to sample high voltage through a high-voltage sampling chip. In some embodiments, it can be tried not to use a high-voltage sampling chip, but to directly sample high voltage with a BMS (Battery Management System, battery management system) main chip MCU (Microcontroller Unit, microcontroller unit). At this time, the reference point is the vehicle body ground, that is, the vehicle body is used as the negative electrode of the electrical circuit, which is a low-voltage sampling high-voltage scheme, thereby realizing a certain degree of cost reduction.

[0073] In the related art, for adhesion detection of the heating switch, whether the heating switch has an adhesion fault is directly judged by the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack. However, in the case that the absolute value of the midpoint voltage of the battery pack is less than a preset voltage, for example, 0, the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack are both 0, regardless of whether the heating switch is in an open state or a closed state, resulting in an error in the judgment result.

[0074] To solve the above technical problems, the disclosure provides a heating switch fault detection method and device, a vehicle, a storage medium and a product. Based on the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack, combined with the battery voltage of the battery pack collected by the insulation monitoring circuit, the problem that the heating switch is in an open state and a closed state due to the absolute value of the midpoint voltage of the battery pack being less than a preset threshold, and the problem that the detection result is inaccurate due to the absolute value of the difference between the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack being less than a preset voltage, are avoided, thereby improving the accuracy of the heating switch fault detection.

[0075] Figure 1 is a schematic diagram of a pulse heating system according to an example embodiment, as shown in Figure 1 The pulse heating system can include a pulse heating circuit, the pulse heating system further includes a battery pack and an insulation monitoring circuit, two ends of the insulation monitoring circuit are connected to the positive electrode and the negative electrode of the battery pack, the first end of the pulse heating circuit is connected to the midpoint of the battery pack, and the second end and the third end of the pulse heating circuit are connected to the positive electrode and the negative electrode of the battery pack, respectively.

[0076] In some possible implementations, the pulse heating circuit can include a driving system of a vehicle, the driving system can include a plurality of driving structures, for example, two driving structures, the driving system cooperates with the battery pack to form the pulse heating circuit, so that the pulse heating circuit can include a plurality of heating circuits, for example, a first heating circuit and a second heating circuit. The heating switch can include a first heating switch and a second heating switch, the first heating switch can be arranged in the first heating circuit, and the second heating switch can be arranged in the second heating circuit.

[0077] In some possible implementations, the battery pack can include a first half pack and a second half pack connected in series, the first end of the pulse heating circuit can be connected between the first half pack and the second half pack, and the second end and the third end of the pulse heating circuit are connected to the positive electrode and the negative electrode of the battery pack, respectively. For example, the second end of the pulse heating circuit is connected to the positive electrode of the first half pack, and the third end of the pulse heating circuit is connected to the negative electrode of the second half pack.

[0078] In some possible implementations, the pulse heating system can further include a positive electrode insulation resistance and a negative electrode insulation resistance. The positive electrode insulation resistance is the actual insulation resistance of the positive electrode of the battery pack, and the negative electrode insulation resistance is the actual insulation resistance of the negative electrode of the battery pack. The positive electrode insulation resistance and the negative electrode insulation resistance can be obtained by detection. The first end of the positive electrode insulation resistance is connected to the positive electrode of the first half pack, and the second end is connected to the vehicle body ground. The first end of the negative electrode insulation resistance is connected to the negative electrode of the second half pack, and the second end is connected to the vehicle body ground.

[0079] In some possible embodiments, the insulation monitoring circuit can include symmetrical positive electrode monitoring circuit and negative electrode monitoring circuit. The positive electrode monitoring circuit can include a first bridge arm resistor connected in parallel to the positive electrode and a third bridge arm resistor connected in parallel to the positive electrode. The first end of the first bridge arm resistor is connected to the positive electrode of the first half pack, and a first parallel resistor switch can be arranged on the connection line of the first end of the first bridge arm resistor. The second end of the first bridge arm resistor is connected to the vehicle body ground. The third bridge arm resistor is connected in parallel to the first bridge arm resistor, and the first end of the third bridge arm resistor is connected to the positive electrode of the first half pack. The second end of the third bridge arm resistor is connected to the vehicle body ground. The negative electrode monitoring circuit can include a second bridge arm resistor connected in parallel to the negative electrode and a fourth bridge arm resistor connected in parallel to the negative electrode. The first end of the second bridge arm resistor is connected to the positive electrode of the first half pack, and a second parallel resistor switch can be arranged on the connection line of the first end of the second bridge arm resistor. The second end of the second bridge arm resistor is connected to the vehicle body ground. The fourth bridge arm resistor is connected in parallel to the third bridge arm resistor, and the first end of the fourth bridge arm resistor is connected to the positive electrode of the first half pack. The second end of the fourth bridge arm resistor is connected to the vehicle body ground. The positive electrode monitoring circuit can further include a first monitoring circuit for monitoring the positive electrode voltage, i.e., the voltage between the positive electrode of the battery pack and the vehicle body ground. The negative electrode monitoring circuit can further include a second monitoring circuit for monitoring the negative electrode voltage, i.e., the voltage between the negative electrode of the battery pack and the vehicle body ground. Optionally, the resistance value of the first bridge arm resistor is equal to the resistance value of the second bridge arm resistor, and the resistance value of the third bridge arm resistor is equal to the resistance value of the fourth bridge arm resistor.

[0080] Figure 2 is a flow chart of a fault detection method of a heating switch according to an exemplary embodiment, as shown in Figure 2 The method can be applied to the pulse heating system in the above embodiments. The heating switch can be arranged in the pulse heating circuit in the pulse heating system. The method can include the following steps:

[0081] In step S201, the fault detection result of the heating switch is determined according to the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit.

[0082] In the embodiment, in the case that the absolute value of the midpoint voltage of the battery pack is less than the preset voltage, for example, 0, no matter whether the heating switch is in the open state or the closed state, the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack are both 0, resulting in an error in the determination result. Therefore, in the embodiment, based on the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack, and further in combination with the battery voltage of the battery pack collected by the insulation monitoring circuit, the insulation monitoring circuit can be adjusted so that the absolute value of the midpoint voltage of the battery pack is greater than the preset voltage. The problem of inaccurate detection result caused by the fact that the absolute value of the midpoint voltage of the battery pack is less than the preset threshold, the heating switch is in the open state and the closed state, and the absolute value of the difference between the voltage of the circuit where the heating switch is located and the midpoint voltage of the battery pack is less than the preset voltage can be avoided, thereby improving the accuracy of the fault detection of the heating switch. The battery voltage of the battery pack collected by the insulation monitoring circuit is used as a basis for adjusting the insulation monitoring circuit in the case that the absolute value of the midpoint voltage of the battery pack is less than the first preset voltage, so that the absolute value of the adjusted midpoint voltage of the battery pack is greater than the first preset voltage.

[0083] In some possible embodiments, the pulse heating circuit includes a first heating circuit and a second heating circuit, and the heating switch includes a first heating switch and a second heating switch, the first heating switch being arranged in the first heating circuit, and the second heating switch being arranged in the second heating circuit.

[0084] According to the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit, the fault detection result of the heating switch is determined, including:

[0085] According to the voltage of the first heating circuit where the first heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit, a first fault detection result of the first heating switch is determined; and according to the voltage of the second heating circuit where the second heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit, a second fault detection result of the second heating switch is determined.

[0086] In the embodiment, the driving system of the vehicle can include two groups of driving structures, so that in the pulse heating system formed with the battery pack, the pulse heating circuit can include a first heating circuit and a second heating circuit. The heating switch can include a first heating switch and a second heating switch, the first heating switch can be arranged in the first heating circuit, and the second heating switch can be arranged in the second heating circuit. Thus, the sticking judgment of the first heating switch and the sticking judgment of the second heating switch can be performed based on the voltage of the first heating circuit in which the first heating switch is located and the voltage of the second heating circuit in which the second heating switch is located respectively, in combination with the midpoint voltage of the battery pack and the battery voltage of the battery pack collected by the insulation monitoring circuit, so that the sticking judgment of multiple heating switches is realized. The judgment manner can refer to the judgment manner of the heating switch in the subsequent.

[0087] In some possible embodiments, the fault detection result of the heating switch is determined according to the voltage of the circuit in which the heating switch is located, the midpoint voltage of the battery pack and the battery voltage of the battery pack collected by the insulation monitoring circuit, and includes:

[0088] In the case that the heating switch is disconnected and the insulation monitoring circuit is in the first state, the first midpoint voltage of the battery pack and the positive electrode voltage and the negative electrode voltage of the battery pack collected by the insulation monitoring circuit are obtained; in the case that the absolute value of the first midpoint voltage is less than a first preset voltage, the insulation monitoring circuit is controlled to be in a second state according to the positive electrode voltage and the negative electrode voltage of the battery pack, and the first voltage of the circuit in which the heating switch is located and the second midpoint voltage of the battery pack are obtained, the second state is used to adjust the absolute value of the second midpoint voltage to be greater than the first preset voltage; and the fault detection result of the heating switch is determined according to the first voltage and the second midpoint voltage.

[0089] In the embodiment, it can be first judged whether the absolute value of the first midpoint voltage is greater than the first preset voltage, in the case that the absolute value of the first midpoint voltage is greater than the first preset voltage, the heating switch can be directly judged whether there is a sticking fault according to the first voltage of the circuit in which the heating switch is located and the first midpoint voltage; in the case that the absolute value of the first midpoint voltage is less than the first preset voltage, no matter whether the heating switch is in the disconnected state or the closed state, the voltage of the circuit in which the heating switch is located and the midpoint voltage of the battery pack are relatively close, that is, both are a smaller value, and directly judging whether the heating switch has a sticking fault through the first voltage of the circuit in which the heating switch is located and the first midpoint voltage will lead to inaccurate judgment result. The insulation monitoring circuit can be further controlled to be in the second state based on the positive electrode voltage and the negative electrode voltage of the battery pack, so as to make the absolute value of the second midpoint voltage obtained greater than the first preset voltage, so that the absolute value of the voltage of the circuit in which the heating switch is located and the midpoint voltage of the battery pack is a larger value when the heating switch is in the disconnected state, the misjudgment is avoided, and the accurate fault detection result of the heating switch is obtained.

[0090] In some possible embodiments, the first state is that the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack.

[0091] According to the positive electrode voltage and the negative electrode voltage of the battery pack, the insulation monitoring circuit is controlled to be in the second state, including:

[0092] According to the positive electrode voltage and the negative electrode voltage of the battery pack, a target bridge arm resistor in the insulation monitoring circuit is determined; and the target bridge arm resistor is controlled to be in communication with the battery pack.

[0093] In the embodiment, the first state can be that the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack. That is, in the case that the heating switch is disconnected and the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack, the first midpoint voltage of the battery pack and the positive electrode voltage and the negative electrode voltage of the battery pack collected by the insulation monitoring circuit are obtained. In the case that the absolute value of the first midpoint voltage is less than a first preset voltage, a target bridge arm resistor in the insulation monitoring circuit is determined according to the positive electrode voltage and the negative electrode voltage of the battery pack, and the target bridge arm resistor in the insulation monitoring circuit is controlled to be in communication with the battery pack, so as to adjust the insulation monitoring circuit to the second state, so as to make the absolute value of the obtained second midpoint voltage greater than the first preset voltage, thereby improving the accuracy of the detection result.

[0094] In some possible embodiments, the bridge arm resistor in the insulation monitoring circuit includes a first bridge arm resistor corresponding to the positive electrode voltage and a second bridge arm resistor corresponding to the negative electrode voltage.

[0095] According to the positive electrode voltage and the negative electrode voltage of the battery pack, the target bridge arm resistor in the insulation monitoring circuit is determined, including:

[0096] In the case that the absolute value of the positive electrode voltage is less than or equal to the absolute value of the negative electrode voltage, the first bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor; and in the case that the absolute value of the positive electrode voltage is greater than the absolute value of the negative electrode voltage, the second bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor.

[0097] In the embodiment, the bridge arm resistor in the insulation monitoring circuit can include a first bridge arm resistor corresponding to the positive electrode voltage and a second bridge arm resistor corresponding to the negative electrode voltage, and the target bridge arm resistor is one of the first bridge arm resistor and the second bridge arm resistor. The closer the resistances corresponding to the positive electrode and the negative electrode, the smaller the midpoint voltage of the battery pack. The resistance corresponding to one of the poles can be adjusted to increase the difference between the resistances corresponding to the positive electrode and the negative electrode, thereby increasing the midpoint voltage of the battery pack. In the case where the absolute value of the positive electrode voltage is less than or equal to the absolute value of the negative electrode voltage, the first bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor, and then the first bridge arm resistor can be connected to the battery pack, that is, the first parallel resistor switch is closed, and the second parallel resistor switch is in an open state. In order to reduce the resistance corresponding to the positive electrode in a parallel manner, reduce the absolute value of the positive electrode voltage, and increase the difference between the absolute value of the positive electrode voltage and the absolute value of the negative electrode voltage, so as to be able to make the absolute value of the obtained second midpoint voltage greater than the first preset voltage; in the case where the absolute value of the positive electrode voltage is greater than the absolute value of the negative electrode voltage, the second bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor, and then the second bridge arm resistor can be connected to the battery pack, that is, the second parallel resistor switch is closed, and the first parallel resistor switch is in an open state. In order to reduce the resistance corresponding to the negative electrode in a parallel manner, reduce the negative electrode voltage, and increase the difference between the absolute value of the positive electrode voltage and the absolute value of the negative electrode voltage, so as to be able to make the absolute value of the obtained second midpoint voltage greater than the first preset voltage. Thus, the accuracy of the detection result of the heating switch can be ensured.

[0098] In some possible embodiments, the fault detection result of the heating switch is determined according to the first voltage and the second midpoint voltage, including:

[0099] In the case where the absolute value of the difference between the first voltage and the second midpoint voltage is less than or equal to the second preset voltage and the duration is greater than the first preset duration, the fault detection result of the heating switch is determined as the first result, and the first result represents that the heating switch has a sticking fault.

[0100] In the embodiment, in the case where the heating switch is normally opened, the first voltage is 0, and the absolute value of the second midpoint voltage is greater than the first preset voltage. The first preset voltage is greater than or equal to the second preset voltage, so that the absolute value of the difference between the first voltage and the second midpoint voltage is greater than the second preset voltage. In the case where the absolute value of the second midpoint voltage is greater than the first preset voltage, the size between the first voltage and the second midpoint voltage can be compared. If the absolute value of the difference between the first voltage and the second midpoint voltage is less than or equal to the second preset voltage and the duration is greater than the first preset duration, it can be determined that the first voltage is equal to or close to the second midpoint voltage due to the sticking fault of the heating switch, and it can be determined that the heating switch has a sticking fault.

[0101] In some possible implementation manners, the method further includes:

[0102] In the case that the heating switch is open and the insulation monitoring circuit is in the first state, a second voltage of a circuit where the heating switch is located is obtained; in the case that an absolute value of the first midpoint voltage is greater than or equal to a first preset voltage, a fault detection result of the heating switch is determined according to the second voltage and the first midpoint voltage.

[0103] In the embodiment, in the case that the heating switch is open and the insulation monitoring circuit is in the first state, the first midpoint voltage of the battery pack and the positive voltage and the negative voltage of the battery pack collected by the insulation monitoring circuit are obtained, and in addition, the second voltage of the circuit where the heating switch is located is obtained. If the absolute value of the first midpoint voltage is greater than or equal to the first preset voltage, there is no misjudgment, and the fault detection result of the heating switch can be directly determined based on the second voltage and the first midpoint voltage.

[0104] In some possible implementation manners, the fault detection result of the heating switch is determined according to the second voltage and the first midpoint voltage, including:

[0105] In the case that an absolute value of a difference between the second voltage and the first midpoint voltage is less than or equal to a second preset voltage and a duration is greater than a second preset duration, the fault detection result of the heating switch is determined as a first result, and the first result represents that the heating switch has a sticking fault.

[0106] In the embodiment, in the case that the absolute value of the difference between the second voltage and the first midpoint voltage is less than or equal to the second preset voltage and the duration is greater than the second preset duration, it can be determined that the second voltage is equal to or close to the first midpoint voltage due to the sticking fault of the heating switch, and it can be determined that the heating switch has the sticking fault. The first preset duration can be equal to the second preset duration.

[0107] Figure 3 FIG. 3 is a flowchart of another method for detecting a fault of a heating switch according to an example embodiment. As shown in FIG. 3, the method can include the following steps: Figure 3

[0108] In step S301, in the case that the heating switch is open and the insulation monitoring circuit is in the first state, the first midpoint voltage of the battery pack and the positive voltage and the negative voltage of the battery pack collected by the insulation monitoring circuit are obtained. That is, the heating switch can be controlled to be open, and the first parallel resistance switch and the second parallel resistance switch can be controlled to be open, and then the first midpoint voltage of the battery pack and the positive voltage and the negative voltage of the battery pack collected by the insulation monitoring circuit are obtained.

[0109] ​In step S302, it is determined whether the absolute value of the first midpoint voltage is greater than the first preset voltage. If yes, then step S307 is executed; otherwise, step S303 is executed.

[0110] In step S303, the target bridge arm resistor is connected to the battery pack. That is, when the absolute value of the positive voltage is less than or equal to the absolute value of the negative voltage, the first parallel resistor switch is closed; when the absolute value of the positive voltage is greater than the absolute value of the negative voltage, the second parallel resistor switch is closed.

[0111] In step S304, the first voltage of the circuit where the heating switch is located and the second midpoint voltage of the battery pack are obtained.

[0112] In step S305, it is determined whether there exists an absolute value of the difference between the first voltage and the second midpoint voltage that is less than or equal to the second preset voltage and has a duration greater than the first preset duration. If yes, then step S306 is executed; otherwise, step S308 is executed.

[0113] In step S306, fault handling is performed.

[0114] In step S307, it is determined whether there exists an absolute value of the difference between the second voltage and the first midpoint voltage that is less than or equal to the second preset voltage and has a duration greater than the second preset duration. If yes, step S306 is executed; otherwise, step S308 is executed.

[0115] In step S308, it is determined that the heating switch is fault-free.

[0116] Figure 4 This is a block diagram illustrating a fault detection device for a heating switch according to an exemplary embodiment. (Refer to...) Figure 4 The fault detection device 400 for the heating switch includes a detection module 401. The heating switch is installed in the pulse heating circuit of the pulse heating system. The pulse heating system also includes a battery pack and an insulation monitoring circuit. The two ends of the insulation monitoring circuit are respectively connected to the positive and negative terminals of the battery pack. The first end of the pulse heating circuit is connected to the midpoint of the battery pack. The second and third ends of the pulse heating circuit are respectively connected to the positive and negative terminals of the battery pack.

[0117] The detection module 401 determines the fault detection result of the heating switch based on the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit.

[0118] In some possible implementation manners, the pulse heating circuit includes a first heating circuit and a second heating circuit, and the heating switch includes a first heating switch and a second heating switch, the first heating switch is arranged in the first heating circuit, and the second heating switch is arranged in the second heating circuit;

[0119] The detection module 401 is configured to:

[0120] determine a first fault detection result of the first heating switch according to a voltage of the first heating circuit in which the first heating switch is located, a midpoint voltage of the battery pack, and a battery voltage of the battery pack collected by the insulation monitoring circuit;

[0121] determine a second fault detection result of the second heating switch according to a voltage of the second heating circuit in which the second heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit.

[0122] In some possible implementation manners, the detection module 401 is configured to:

[0123] when the heating switch is turned off and the insulation monitoring circuit is in a first state, acquire a first midpoint voltage of the battery pack and positive and negative voltages of the battery pack collected by the insulation monitoring circuit;

[0124] when an absolute value of the first midpoint voltage is less than a first preset voltage, control the insulation monitoring circuit to be in a second state according to the positive and negative voltages of the battery pack, and acquire a first voltage of a circuit in which the heating switch is located and a second midpoint voltage of the battery pack, the second state being used to adjust the absolute value of the second midpoint voltage to be greater than the first preset voltage;

[0125] determine a fault detection result of the heating switch according to the first voltage and the second midpoint voltage.

[0126] In some possible implementation manners, the first state is that a bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack;

[0127] The detection module 401 is configured to:

[0128] determine a target bridge arm resistor in the insulation monitoring circuit according to the positive and negative voltages of the battery pack;

[0129] control the target bridge arm resistor to be in communication with the battery pack.

[0130] In some possible implementation manners, the bridge arm resistor in the insulation monitoring circuit comprises a first bridge arm resistor corresponding to the positive electrode voltage and a second bridge arm resistor corresponding to the negative electrode voltage.

[0131] The detection module 401 is configured to:

[0132] In a case where the absolute value of the positive electrode voltage is less than or equal to the absolute value of the negative electrode voltage, the first bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor.

[0133] In a case where the absolute value of the positive electrode voltage is greater than the absolute value of the negative electrode voltage, the second bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor.

[0134] In some possible implementation manners, the detection module 401 is configured to:

[0135] The determination of the fault detection result of the heating switch according to the first voltage and the second midpoint voltage comprises:

[0136] In a case where the absolute value of the difference between the first voltage and the second midpoint voltage is less than or equal to a second preset voltage and the duration is greater than a first preset duration, the fault detection result of the heating switch is determined as a first result, and the first result represents that the heating switch has a sticking fault.

[0137] In some possible implementation manners, the detection module 401 is configured to:

[0138] In a case where the heating switch is turned off and the insulation monitoring circuit is in a first state, a second voltage of a circuit in which the heating switch is located is obtained.

[0139] In a case where the absolute value of the first midpoint voltage is greater than or equal to the first preset voltage, the fault detection result of the heating switch is determined according to the second voltage and the first midpoint voltage.

[0140] In some possible implementation manners, the detection module 401 is configured to:

[0141] In a case where the absolute value of the difference between the second voltage and the first midpoint voltage is less than or equal to a second preset voltage and the duration is greater than a second preset duration, the fault detection result of the heating switch is determined as a first result, and the first result represents that the heating switch has a sticking fault.

[0142] As to the fault detection apparatus 400 of the heating switch in the above-mentioned embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and thus will not be described in detail here.

[0143] The present disclosure also provides a computer readable storage medium having stored thereon computer program instructions, which, when executed by a processor, implement the steps of the fault detection method of the heating switch provided by the present disclosure.

[0144] Figure 5 is a block diagram of another fault detection apparatus of a heating switch according to an exemplary embodiment. For example, the fault detection apparatus 500 of the heating switch can be a vehicle controller or a battery manager.

[0145] Referring to Figure 5 The fault detection apparatus 500 of the heating switch can include one or more of the following components: a first processing component 502, a first memory 504, a first power supply component 506, a multimedia component 508, an audio component 510, a first input / output interface 512, a sensor component 514, and a communication component 516.

[0146] The first processing component 502 generally controls the overall operation of the fault detection apparatus 500 of the heating switch, such as operations associated with displaying, making phone calls, data communications, camera operations, and recording operations. The first processing component 502 can include one or more processors 520 to execute instructions to complete all or part of the steps of the fault detection method of the heating switch described above. In addition, the first processing component 502 can include one or more modules to facilitate interaction between the first processing component 502 and other components. For example, the first processing component 502 can include a multimedia module to facilitate interaction between the multimedia component 508 and the first processing component 502.

[0147] The first memory 504 is configured to store various types of data to support the operation of the fault detection apparatus 500 of the heating switch. Examples of such data include instructions for any application or method operating on the fault detection apparatus 500 of the heating switch, contact data, phonebook data, messages, pictures, videos, and the like. The first memory 504 can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0148] The first power component 506 provides power to various components of the heating switch fault detection apparatus 500. The first power component 506 can include a power management system, one or more power sources, and other components associated with generating, managing and distributing power for the heating switch fault detection apparatus 500.

[0149] The multimedia component 508 includes a screen providing an output interface between the heating switch fault detection apparatus 500 and a user. In some embodiments, the screen includes a liquid crystal display (LCD) and a touch panel (TP). If the screen includes the touch panel, the screen can be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touch, swiping and gestures on the touch panel. The touch sensors can not only sense a boundary of a touch or swiping action, but also detect duration and pressure related to the touch or swiping action. In some embodiments, the multimedia component 508 includes a front camera and / or a rear camera. The front and / or rear camera can receive external multimedia data when the heating switch fault detection apparatus 500 is in an operation mode, such as a shooting mode or a video mode. Each of the front and rear camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0150] The audio component 510 is configured to output and / or input audio signals. For example, the audio component 510 includes a microphone (MIC) that is configured to receive an external audio signal when the heating switch fault detection apparatus 500 is in an operation mode, such as a call mode, a recording mode and a voice recognition mode. The received audio signal can be further stored in the first memory 504 or transmitted via the communication component 516. In some embodiments, the audio component 510 further includes a speaker for outputting audio signals.

[0151] The first input / output interface 512 provides an interface between the first processing component 502 and peripheral interface modules, which can be a keyboard, a click wheel, buttons, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0152] The sensor assembly 514 includes one or more sensors for providing status assessments of various aspects of the heating switch fault detection apparatus 500. For example, the sensor assembly 514 can detect an open / closed status of the heating switch fault detection apparatus 500, a relative positioning of components of the heating switch fault detection apparatus 500, such as a display and keypad of the heating switch fault detection apparatus 500, a change in position of the heating switch fault detection apparatus 500 or a component of the heating switch fault detection apparatus 500, a presence or absence of user contact with the heating switch fault detection apparatus 500, an orientation or acceleration / deceleration of the heating switch fault detection apparatus 500, and a change in temperature of the heating switch fault detection apparatus 500. The sensor assembly 514 can include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 514 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 514 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0153] The communication assembly 516 is configured to facilitate wired or wireless communication between the heating switch fault detection apparatus 500 and other devices. The heating switch fault detection apparatus 500 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an example embodiment, the communication assembly 516 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication assembly 516 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0154] In example embodiments, the heating switch fault detection apparatus 500 can be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements for performing the heating switch fault detection methods described above.

[0155] In an exemplary embodiment, a non-transitory computer readable storage medium including instructions, such as the first memory 504 including instructions, is also provided, which can be executed by the processor 520 of the heating switch fault detection apparatus 500 to complete the heating switch fault detection method described above. For example, the non-transitory computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0156] Figure 6 is a block diagram of a vehicle according to an exemplary embodiment, as Figure 6 As shown in another exemplary embodiment, a vehicle is also provided, which includes the heating switch fault detection apparatus in the above-described embodiments, and the pulse heating system in the heating switch fault detection method in the above-described embodiments.

[0157] In another exemplary embodiment, a computer program product is also provided, which contains a computer program capable of being executed by a programmable apparatus, and the computer program has code portions for executing the heating switch fault detection method described above when executed by the programmable apparatus.

[0158] Those skilled in the art will also appreciate that the various illustrative logical blocks and steps (steps) listed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of both. Whether the functions are implemented by hardware or software depends on the specific application and design requirements of the overall system. Those skilled in the art can implement the described functions for each specific application using various methods, but such implementation should not be understood as beyond the scope of protection of the embodiments of the present application.

[0159] In the above detailed description, terms such as "center", "upper", "lower", "left", "right", etc. indicate directions or represent positional relationships. Since the components of the described devices can be positioned in a plurality of different orientations, the directional terms can be used for illustrative purposes, but are not limiting. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be considered as limiting.

[0160] It should be understood that the features of various embodiments of the present disclosure described herein can be combined with each other unless specifically indicated otherwise.

[0161] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited to the above terms. Instead, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, the first element, component, region, layer or section mentioned in the examples described herein can also be referred to as the second element, component, region, layer or section without departing from the teachings of the examples. In addition, the terms "first", "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or an indicated number of technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description herein, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0162] Furthermore, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the exemplary word is used herein to present concepts in a concrete manner. As used in this document, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied under any of the foregoing instances. In addition, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form.

[0163] Likewise, although the present disclosure has been described and illustrated with respect to one or more implementations, equivalent alterations and modifications will become apparent to those skilled in the art that do not depart from the true spirit and scope of the disclosure. The present disclosure includes all such modifications and alterations and is limited only by the scope of the following claims. In particular regard to the various functions performed by the above described components (e.g., elements, resources, etc.), the terms (including a reference to a "means") used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the described function (e.g., a functional equivalent), even though not structurally equivalent to the disclosed structure. In addition, although a particular feature of the disclosure can have been disclosed with respect to only one of several implementations, other implementations can include the particular feature. For example, the disclosure can be implemented with respect to other implementations that incorporate the particular feature, and that implement other features as disclosed herein, and each of the various implementations have a reasonable expectation of support. Furthermore, to the extent that the terms "includes", "including", "has", "have", "having", or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0164] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features of the disclosure disclosed herein. It is intended that the present disclosure be considered as including any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such steps, compositions, components, and / or elements known in the art to be appropriate. It is specifically intended that the present disclosure include all such modifications and alterations in the application, matter, and scope of the disclosure as fall within the usual practice of the art and are equated with the principles of the disclosure. The specification and examples are to be considered exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

[0165] It is to be understood that the present disclosure is not limited to the precise construction described and shown herein and that changes can be made in various details without departing from the scope of the disclosure. The scope of the present disclosure is limited only by the claims appended hereto.

Claims

1. A method for detecting faults in a heating switch, characterized in that, The heating switch is disposed in the pulse heating circuit of the pulse heating system. The pulse heating system further includes a battery pack and an insulation monitoring circuit. The two ends of the insulation monitoring circuit are respectively connected to the positive and negative terminals of the battery pack. The first end of the pulse heating circuit is connected to the midpoint of the battery pack. The second and third ends of the pulse heating circuit are respectively connected to the positive and negative terminals of the battery pack. The method includes: The fault detection result of the heating switch is determined based on the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit. The step of determining the fault detection result of the heating switch based on the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit includes: When the heating switch is off and the insulation monitoring circuit is in the first state, the first midpoint voltage of the battery pack and the positive and negative voltages of the battery pack collected by the insulation monitoring circuit are obtained. When the absolute value of the first midpoint voltage is less than the first preset voltage, the insulation monitoring circuit is controlled to a second state according to the positive and negative voltages of the battery pack, and the first voltage of the circuit where the heating switch is located and the second midpoint voltage of the battery pack are obtained. The second state is used to adjust the absolute value of the second midpoint voltage to be greater than the first preset voltage. The fault detection result of the heating switch is determined based on the first voltage and the second midpoint voltage.

2. The fault detection method for the heating switch according to claim 1, characterized in that, The pulse heating circuit includes a first heating circuit and a second heating circuit, and the heating switch includes a first heating switch and a second heating switch, wherein the first heating switch is disposed in the first heating circuit and the second heating switch is disposed in the second heating circuit; The step of determining the fault detection result of the heating switch based on the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit includes: The first fault detection result of the first heating switch is determined based on the voltage of the first heating circuit where the first heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit. The second fault detection result of the second heating switch is determined based on the voltage of the second heating circuit where the second heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit.

3. The fault detection method for the heating switch according to claim 1, characterized in that, The first state is that the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack; The step of controlling the insulation monitoring circuit to a second state based on the positive and negative voltages of the battery pack includes: The target bridge arm resistance in the insulation monitoring circuit is determined based on the positive and negative voltages of the battery pack. The target bridge arm resistor is connected to the battery pack.

4. The fault detection method for the heating switch according to claim 3, characterized in that, The bridge arm resistors in the insulation monitoring circuit include a first bridge arm resistor corresponding to the positive voltage and a second bridge arm resistor corresponding to the negative voltage; Determining the target bridge arm resistance in the insulation monitoring circuit based on the positive and negative voltages of the battery pack includes: If the absolute value of the positive voltage is less than or equal to the absolute value of the negative voltage, the first bridge arm resistance in the insulation monitoring circuit is determined as the target bridge arm resistance. If the absolute value of the positive voltage is greater than the absolute value of the negative voltage, the second bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor.

5. The fault detection method for the heating switch according to claim 1, characterized in that, Determining the fault detection result of the heating switch based on the first voltage and the second midpoint voltage includes: If the absolute value of the difference between the first voltage and the second midpoint voltage is less than or equal to the second preset voltage, and the duration is greater than the first preset duration, the fault detection result of the heating switch is determined as the first result, and the first result indicates that the heating switch has an adhesion fault.

6. The fault detection method for the heating switch according to claim 1, characterized in that, The method further includes: When the heating switch is off and the insulation monitoring circuit is in the first state, the second voltage of the circuit where the heating switch is located is obtained; If the absolute value of the first midpoint voltage is greater than or equal to the first preset voltage, the fault detection result of the heating switch is determined based on the second voltage and the first midpoint voltage.

7. The fault detection method for the heating switch according to claim 6, characterized in that, Determining the fault detection result of the heating switch based on the second voltage and the first midpoint voltage includes: If the absolute value of the difference between the second voltage and the first midpoint voltage is less than or equal to the second preset voltage, and the duration is greater than the second preset duration, the fault detection result of the heating switch is determined as the first result, and the first result indicates that the heating switch has an adhesion fault.

8. A fault detection device for a heating switch, characterized in that, The heating switch is disposed in the pulse heating circuit of the pulse heating system. The pulse heating system further includes a battery pack and an insulation monitoring circuit. The two ends of the insulation monitoring circuit are respectively connected to the positive and negative terminals of the battery pack. The first end of the pulse heating circuit is connected to the midpoint of the battery pack. The second and third ends of the pulse heating circuit are respectively connected to the positive and negative terminals of the battery pack. The device includes: The detection module is configured to determine the fault detection result of the heating switch based on the voltage of the circuit where the heating switch is located, the midpoint voltage of the battery pack, and the battery voltage of the battery pack collected by the insulation monitoring circuit. The detection module is further configured to: When the heating switch is off and the insulation monitoring circuit is in the first state, the first midpoint voltage of the battery pack and the positive and negative voltages of the battery pack collected by the insulation monitoring circuit are obtained. When the absolute value of the first midpoint voltage is less than the first preset voltage, the insulation monitoring circuit is controlled to a second state according to the positive and negative voltages of the battery pack, and the first voltage of the circuit where the heating switch is located and the second midpoint voltage of the battery pack are obtained. The second state is used to adjust the absolute value of the second midpoint voltage to be greater than the first preset voltage. The fault detection result of the heating switch is determined based on the first voltage and the second midpoint voltage.

9. The fault detection device for the heating switch according to claim 8, characterized in that, The first state is that the bridge arm resistor in the insulation monitoring circuit is disconnected from the battery pack; The detection module includes: The target bridge arm resistance in the insulation monitoring circuit is determined based on the positive and negative voltages of the battery pack. The target bridge arm resistor is connected to the battery pack.

10. The fault detection device for the heating switch according to claim 9, characterized in that, The bridge arm resistors in the insulation monitoring circuit include a first bridge arm resistor corresponding to the positive voltage and a second bridge arm resistor corresponding to the negative voltage; The detection module is configured as follows: If the absolute value of the positive voltage is less than or equal to the absolute value of the negative voltage, the first bridge arm resistance in the insulation monitoring circuit is determined as the target bridge arm resistance. If the absolute value of the positive voltage is greater than the absolute value of the negative voltage, the second bridge arm resistor in the insulation monitoring circuit is determined as the target bridge arm resistor.

11. The fault detection device for the heating switch according to claim 8, characterized in that, The detection module is configured as follows: If the absolute value of the difference between the first voltage and the second midpoint voltage is less than or equal to the second preset voltage, and the duration is greater than the first preset duration, the fault detection result of the heating switch is determined as the first result, and the first result indicates that the heating switch has an adhesion fault.

12. A fault detection device for a heating switch, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to execute the steps of the fault detection method for the heating switch according to any one of claims 1 to 7.

13. A vehicle, characterized in that, The invention includes the fault detection device for the heating switch as described in claim 12, and the pulse heating system in the fault detection method for the heating switch as described in any one of claims 1 to 7.

14. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the steps of the fault detection method for the heating switch according to any one of claims 1 to 7.

15. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the steps of the fault detection method for the heating switch according to any one of claims 1 to 7.

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