Charging and discharging circuit of high-voltage power supply unit, detection method for charging and discharging circuit and electric equipment

Abstract

The invention provides a high-voltage power supply unit charging and discharging circuit and a relay detection method used for the same. The method comprises the steps of determining whether a second voltage is greater than or equal to a preset percentage of a high-voltage power supply unit total voltage; when it is determined that the second voltage is greater than or equal to the preset percentage of the total voltage of the high-voltage power supply unit, determining whether a preset time length can be maintained; determining whether the pre-charging auxiliary contact voltage and the main and positive auxiliary contact voltage are equal to the rated voltage of the auxiliary contact or not when it is determined that the pre-charging auxiliary contact voltage and the main and positive auxiliary contact voltage can be kept for the preset time length; when it is determined that the voltage of the pre-charging auxiliary contact and the voltage of the main positive auxiliary contact are both equal to the rated voltage of the auxiliary contact, it is determined that the pre-charging relay and the main positive relay are both adhered; and under the condition that the voltage of the pre-charging auxiliary contact and the voltage of the main positive auxiliary contact are not equal to the rated voltage of the auxiliary contact, whether the voltage of the pre-charging auxiliary contact is equal to the rated voltage of the auxiliary contact is determined, if yes, the pre-charging relay is adhered, and otherwise, the main positive relay is adhered.

Description

Technical Field

[0001] The present application relates to the field of batteries, and particularly to a relay detection method for a charging and discharging circuit of a high-voltage power supply unit, a charging and discharging circuit of a high-voltage power supply unit, and an electrical device. Background Art

[0002] When the existing high-voltage power supply unit performs power-on self-check, it usually detects relay adhesion only by comparing the front-end and back-end voltages, which is easily affected by external factors (such as magnetic fields) and system self-factors (such as program runaway), and there is a risk of false reporting of relay detection results; in addition, the existing detection method requires more high-voltage detection points, and electromagnetic will be conducted outward through the high-voltage sampling line, bringing the risk of electromagnetic compatibility (EMC) interference, while increasing costs and complexity. Summary of the Invention

[0003] Some embodiments of the present application provide a relay detection method for a charging and discharging circuit of a high-voltage power supply unit and a charging and discharging circuit of a high-voltage power supply unit. The following introduces the present application from multiple aspects, and the embodiments and beneficial effects of the following multiple aspects can be referred to each other.

[0004] In a first aspect, an embodiment of the present application provides a relay detection method for a charging and discharging circuit of a high-voltage power supply unit. The charging and discharging circuit of the high-voltage power supply unit includes a main negative relay, a pre-charge relay provided with an auxiliary contact, and a main positive relay provided with an auxiliary contact. The relay detection method includes:

[0005] When the main negative relay, the pre-charge relay, and the main positive relay have not received a closing instruction, determine whether the second voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold, where the closing instruction is used to indicate that the relay is in a closed state, the second voltage is the voltage between the negative pole of the high-voltage power supply unit and the second voltage detection point, and the second voltage detection point is set behind the main positive relay and / or the pre-charge relay;

[0006] The relay detection method further includes any one of the following:

[0007] When it is determined that the second voltage is less than the preset percentage of the total voltage of the high-voltage power supply unit or the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, determine that neither the pre-charge relay nor the main positive relay is adhered;

[0008] When it is determined that the second voltage is greater than or equal to the preset percentage of the total voltage of the high-voltage power supply unit and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, determine whether it is possible to maintain a preset time length;

[0009] In the case where it is determined that the preset time length cannot be maintained, it is determined that the pre-charge relay and the main positive relay are not sticky;

[0010] When it is determined that the preset time length can be maintained, determining whether the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are both equal to the rated voltage of the auxiliary contact;

[0011] Under the condition that it is determined that the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are both equal to the rated voltage of their auxiliary contacts, it is determined that both the pre-charge relay and the main positive relay are adhered;

[0012] When it is determined that the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are not both equal to the rated voltage of their auxiliary contacts, determine whether the pre-charge auxiliary contact voltage is equal to the rated voltage of its auxiliary contact. If so, determine that the pre-charge relay is stuck; otherwise, determine that the main positive relay is stuck. Alternatively, determine whether the main positive auxiliary contact voltage is equal to the rated voltage of its auxiliary contact. If so, determine that the main positive relay is stuck; otherwise, determine that the pre-charge relay is stuck.

[0013] In the present application, by adopting a main positive relay provided with an auxiliary contact and a pre-charged relay provided with an auxiliary contact, it is possible to perform relay detection with the aid of its auxiliary contact voltage, and compared with the traditional relay detection circuit and method, the high-voltage detection point can be reduced, and the risk of EMC interference caused by electromagnetic conduction through the high-voltage sampling line can be reduced, while the cost can be controlled. Secondly, a time holding step (such as step S203) is added before determining that the relay is adhered, reducing the risk of false alarms of relay detection results caused by the influence of the external magnetic field or the system's own program running away, and improving the detection accuracy. Furthermore, the present application is arranged in parallel with the main negative relay by an anti-reverse circuit, so that the main negative relay can be avoided as much as possible from being suddenly disconnected, and the third voltage increases, exceeding the withstand voltage value of the control unit (the main control chip of the BMS) and causing damage to the components in the circuit.

[0014] In some embodiments, when none of the main negative relay, the pre-charge relay, and the main positive relay receives a closing instruction, the step of determining whether the second voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold further includes:

[0015] Determine whether the third voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold, wherein the third voltage is the voltage between the positive electrode of the high-voltage power supply unit and a third voltage detection point, and the third voltage detection point is set before the main negative relay;

[0016] In the case where it is determined that the third voltage is less than a preset percentage of the total voltage of the high-voltage power supply unit or the total voltage of the high-voltage power supply unit is less than a preset voltage threshold, determining that the main negative relay is not stuck;

[0017] When it is determined that the third voltage is greater than or equal to the total voltage of the high-voltage power supply unit at a preset percentage and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, determine whether the preset time length can be maintained;

[0018] When it is determined that the preset time length can be maintained, determine that the main negative relay is stuck;

[0019] When it is determined that the preset time length cannot be maintained, determine that the main negative relay is not stuck.

[0020] In some embodiments, it further includes:

[0021] When it is determined that none of the main negative relay, the pre-charge relay, and the main positive relay is stuck, the main negative relay and the main positive relay close after receiving the closing instruction.

[0022] In some embodiments, the charge and discharge circuit of the high-voltage power supply unit further includes: a heating relay. After the step that when it is determined that none of the main negative relay, the pre-charge relay, and the main positive relay is stuck, the main negative relay and the main positive relay close after receiving the closing instruction, it further includes:

[0023] Determine whether the fourth voltage is greater than or equal to the total voltage of the high-voltage power supply unit at a preset percentage and whether the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, where the fourth voltage is the voltage between the negative pole of the high-voltage power supply unit and the fourth voltage detection point, and the fourth voltage detection point is set behind the heating relay;

[0024] When it is determined that the fourth voltage is less than the total voltage of the high-voltage power supply unit at a preset percentage or the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, determine that the heating relay is not stuck;

[0025] When it is determined that the fourth voltage is greater than or equal to the total voltage of the high-voltage power supply unit at a preset percentage and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, determine whether the preset time length can be maintained;

[0026] When it is determined that the preset time length can be maintained, determine that the heating relay is stuck;

[0027] When it is determined that the preset time length cannot be maintained, determine that the heating relay is not stuck.

[0028] In some embodiments, the preset percentage is 95%, and / or the preset time length is 2 - 5 s, and / or the preset voltage threshold is 25 V.

[0029] Second aspect, the present application also provides a charging and discharging circuit for a high-voltage power supply unit, including: a high-voltage power supply unit, a main positive relay provided with an auxiliary contact, a pre-charge relay provided with an auxiliary contact, a pre-charge resistor, a main negative relay, an anti-reverse circuit, and a control unit. The pre-charge relay is connected in series with the pre-charge resistor and then connected in parallel with the main positive relay. The anti-reverse circuit is connected in parallel with the main negative relay. Among them, a third voltage detection point is provided in front of the main negative relay, and a second voltage detection point is provided behind the main positive relay and / or the pre-charge relay. The control unit is configured to be able to execute any one of the relay detection methods as described above.

[0030] In some embodiments, the anti-reverse circuit includes: a low-voltage power supply, a pull-up resistor, a voltage-stabilizing resistor, a voltage-dividing resistor, and a diode. One end of the pull-up resistor is respectively connected to the voltage-stabilizing resistor and the voltage-dividing resistor, and a third voltage detection point is provided at the other end of the pull-up resistor.

[0031] In some embodiments, an anti-reverse circuit is provided in parallel at both ends of the main positive relay and / or the heating relay.

[0032] In some embodiments, a fuse is provided in front of the main positive relay and / or the heating relay, and / or a shunt is provided between the main negative relay and the negative electrode of the high-voltage power supply unit.

[0033] In some embodiments, it further includes: a heating film, connected in series with the heating relay and provided behind the heating relay, and / or the high-voltage power supply unit is a battery pack.

[0034] Third aspect, the present application also provides an electrical device, including the charging and discharging circuit of the high-voltage power supply unit as described in any one of the second aspect. Description of the Drawings

[0035] Figure 1 A schematic diagram showing a charging and discharging circuit of a high-voltage power supply unit provided according to some embodiments of the present application;

[0036] Figure 2 A flowchart showing a relay detection method provided according to some embodiments of the present application;

[0037] Figure 3 A model showing a relay detection method for a charging and discharging circuit of a high-voltage power supply unit provided according to some embodiments of the present application;

[0038] Figure 4 A test case showing 10 analog signal inputs provided according to some embodiments of the present application;

[0039] Figure 5 A back-to-back test framework showing 10 analog signal inputs provided according to some embodiments of the present application;

[0040] Figure 6Shows a block diagram of a SoC (System on Chip) provided according to some embodiments of the present application. Detailed implementation manners

[0041] The following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings.

[0042] Figure 1 Shows a schematic diagram of a charge and discharge circuit of a high-voltage power supply unit provided according to some embodiments of the present application. As Figure 1 shown, the charge and discharge circuit of the high-voltage power supply unit includes: a high-voltage power supply unit, a main positive relay 2 provided with an auxiliary contact, a pre-charge relay 3 provided with an auxiliary contact, a pre-charge resistor 4, a main negative relay 9, an anti-reverse circuit, and a control unit (not shown in the figure). The following takes the charge and discharge circuit of the high-voltage power supply unit being applied to a new energy vehicle as an example to Figure 1 make a specific introduction. When applied to a new energy vehicle, the high-voltage power supply unit can be a battery pack PACK, which is responsible for storing and releasing electric energy to provide power for the vehicle. As Figure 1 shown, the discharge end is connected to a load (not shown in the figure). During discharge, the battery pack can supply power to the load (such as a motor) through a closed loop; the charging end is used to connect to a charging pile through a charging gun. During charging, the charging pile can supply power to the battery pack through a closed loop.

[0043] Among them, the pre-charge relay 3 and the pre-charge resistor 4 are connected in series and then connected in parallel with the main positive relay 2. The anti-reverse circuit is connected in parallel with the main negative relay 9. A third voltage detection point 8 is provided in front of the main negative relay 9 so that the control unit can detect the third voltage between it and the positive pole PACK+ of the battery pack. A second voltage detection point 5 is provided behind the main positive relay 2 and / or the pre-charge relay 3 so that the control unit can detect the second voltage between it and the negative pole PACK- of the battery pack. It should be noted that the "front" and "back" here are in the reference direction of the current flow when the battery pack discharges.

[0044] The control unit can be the main control chip of a Battery Management System (BMS), which is configured to be able to execute a relay detection method for the charge and discharge circuit of the high-voltage power supply unit. Figure 2 Shows a flowchart of a relay detection method provided according to some embodiments of the present application. The following will Figure 2 make a specific introduction to the relay detection method.

[0045] In the case where the main negative relay 9, the pre-charge relay 3, and the main positive relay 2 have not received a closing instruction, step S201 is executed to determine whether the second voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold.

[0046] Among them, the second voltage is the voltage between the negative electrode of the high-voltage power supply unit (the negative electrode of the battery pack PACK-) and the second voltage detection point 5. The closing instruction is used to indicate that the relay is in the closed state, and it can be an instruction issued by the control unit. The preset percentage can be 90% or 95%, or it can be set according to actual needs, and no specific limitation is made here. In this embodiment, the preset percentage is 95%. The preset voltage threshold can be 25V, or it can be set according to the actual situation.

[0047] When it is determined that the second voltage is less than the total voltage of the high-voltage power supply unit at the preset percentage or the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, step S202 is executed to determine that neither the pre-charge relay 3 nor the main positive relay 2 is stuck.

[0048] When it is determined that the total voltage of the high-voltage power supply unit where the second voltage is greater than or equal to the preset percentage and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, step S203 is executed to determine whether the preset time length can be maintained.

[0049] It should be noted that the preset time length needs to be less than the BMS self-check time, and it can be 2s, 5s or other values, and no specific limitation is made here.

[0050] When it is determined that the preset time length cannot be maintained, step S202 is executed to determine that neither the pre-charge relay 3 nor the main positive relay 2 is stuck.

[0051] When it is determined that the preset time length can be maintained, step S205 is executed to determine whether the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are both equal to the rated voltage of their auxiliary contacts.

[0052] In this embodiment, the rated voltages of both the pre-charge auxiliary contact and the main positive auxiliary contact are 5V. In other embodiments, the rated voltages of the pre-charge auxiliary contact and the main positive auxiliary contact can be other values, which specifically depend on the selection of the pre-charge relay 3 and the main positive relay 2.

[0053] When it is determined that both the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are equal to the rated voltage of their auxiliary contacts, step S206 is executed to determine that both the pre-charge relay 3 and the main positive relay 2 are stuck.

[0054] When it is determined that the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are not both equal to the rated voltage of their auxiliary contacts, step S207 is executed to determine whether the pre-charge auxiliary contact voltage is equal to the rated voltage of its auxiliary contact.

[0055] When it is determined that the pre-charge auxiliary contact voltage is equal to the rated voltage of its auxiliary contact, step S208 is executed to determine that the pre-charge relay 3 is stuck.

[0056] When it is determined that the pre-charge auxiliary contact voltage is not equal to the rated voltage of the auxiliary contact, step S209 is executed to determine whether the main positive relay 2 is stuck.

[0057] In other embodiments, the above steps S207 to S209 may also be, when it is determined that the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are not both equal to the rated voltage of the auxiliary contact, determining whether the main positive auxiliary contact voltage is equal to the rated voltage of the auxiliary contact. When it is determined that the main positive auxiliary contact voltage is equal to the rated voltage of the auxiliary contact, determining that the main positive relay 2 is stuck. When it is determined that the main positive auxiliary contact voltage is not equal to the rated voltage of the auxiliary contact, determining that the pre-charge relay 3 is stuck.

[0058] In the present application, by adopting a main positive relay 2 provided with an auxiliary contact and a pre-filling relay 3 provided with an auxiliary contact, it is possible to perform relay detection with the aid of its auxiliary contact voltage. Compared with the traditional relay detection circuit and method, the high-voltage detection point can be reduced, and the risk of EMC interference caused by electromagnetic conduction through the high-voltage sampling line can be reduced, while the cost can be controlled. Secondly, a time holding step (such as step S203) is added before determining that the main positive relay 2 and the pre-filling relay 3 are adhered, reducing the risk of false alarm of the relay detection result caused by the influence of the external magnetic field or the system's own program running away, and improving the detection accuracy. Furthermore, the present application is arranged in parallel with the main negative relay 9 through an anti-reverse circuit, which can avoid the main negative relay 9 from being suddenly disconnected as much as possible, and the third voltage increases, which exceeds the withstand voltage value of the control unit (the main control chip of the BMS) and causes damage to the components in the circuit.

[0059] In some embodiments, the relay detection method further comprises:

[0060] When the main negative relay 9, the pre-charge relay 3 and the main positive relay 2 have not received a closing instruction, execute step S210 to determine whether the third voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold.

[0061] Among them, the third voltage is the positive electrode of the high-voltage power supply unit (the positive electrode of the battery pack PACK + ) and the voltage between the third voltage detection point 8, and the third voltage detection point 8 is set in front of the main negative relay 9. The closing instruction is used to indicate that the relay is in a closed state, which can be an instruction issued by the control unit. The preset percentage can be 90% or 95%, and can also be set according to actual needs, which is not specifically limited here. In this embodiment, the preset percentage is 95%. The preset voltage threshold can be 25V, or set according to actual conditions.

[0062] When it is determined that the total voltage of the high-voltage power supply unit is less than the preset percentage of the third voltage and the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, step S211 is executed to determine that the main negative relay 9 is not stuck.

[0063] When it is determined that the total voltage of the high-voltage power supply unit is greater than or equal to the preset percentage of the third voltage and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, step S212 is executed to determine whether the preset time length can be maintained.

[0064] It should be noted that the preset time length needs to be less than the BMS self-check time, and it can be 2s, 5s or other values, which are not specifically limited here.

[0065] When it is determined that the preset time length can be maintained, step S213 is executed to determine that the main negative relay 9 is stuck.

[0066] When it is determined that the preset time length cannot be maintained, step S211 is executed to determine that the main negative relay 9 is not stuck.

[0067] In this application, by adding a time-holding step (such as step S212) before determining that the main negative relay 9 is stuck, the risk of false alarms in the relay detection result caused by external magnetic field influence or system self-program runaway is reduced, and the detection accuracy is improved.

[0068] In some embodiments, the relay detection method further includes:

[0069] When it is determined that none of the main negative relay 9, the pre-charge relay 3, and the main positive relay 2 are stuck, step S215 is executed, and the main negative relay 9 and the main positive relay 2 are closed after receiving the closing instruction.

[0070] When applied to the new energy vehicle field, steps S201 to S213 are the BMS power-on initialization self-check process. When there is no relay sticking fault in the power-on initial check, the control unit (the main control chip of the BMS) sends a power-on ready instruction to the vehicle control unit (VCU). After the VCU sends a high-voltage instruction (closing instruction), the control unit (the main control chip of the BMS) closes the main negative relay 9 and the main positive relay 2 according to the closing instruction.

[0071] In some embodiments, the high-voltage power supply unit charge and discharge circuit further includes: a heating relay 12. After the main negative relay 9 and the main positive relay 2 are closed after receiving the closing instruction in step S215, the following steps are further included:

[0072] Step S216: Determine whether the fourth voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold. Herein, the fourth voltage is the voltage between the negative electrode of the high-voltage power supply unit and the fourth voltage detection point 10, and the fourth voltage detection point 10 is set behind the heating relay 12.

[0073] When it is determined that the fourth voltage is less than a preset percentage of the total voltage of the high-voltage power supply unit or the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, step S217 is executed to determine that the heating relay 12 is not stuck.

[0074] When it is determined that the fourth voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, step S218 is executed to determine whether the preset time length can be maintained.

[0075] When it is determined that the preset time length can be maintained, step S219 is executed to determine that the heating relay 12 is stuck.

[0076] When it is determined that the preset time length cannot be maintained, step S217 is executed to determine that the heating relay 12 is not stuck.

[0077] In this application, by adding a time-holding step (such as step S218) before determining that the heating relay 12 is stuck, the risk of false alarms in the relay detection result caused by external magnetic field influence or system self-program runaway is reduced, and the detection accuracy is improved.

[0078] The above combination Figure 2 Specifically introduced the relay detection method that the control unit in the charge and discharge circuit of the high-voltage power supply unit can execute. Next, continue to refer to Figure 1 Introduce the charge and discharge circuit of the high-voltage power supply unit.

[0079] In some embodiments, the anti-reverse circuit includes: a low-voltage power supply, a pull-up resistor R2, a voltage-stabilizing resistor R1, a voltage-dividing resistor R3, and a diode D1. One end of the pull-up resistor R2 is connected to the voltage-stabilizing resistor R1 and the voltage-dividing resistor R3 respectively, and the other end of the pull-up resistor R2 is provided with a third voltage detection point 8. The low-voltage power supply is used to reduce the influence brought by the voltage fluctuation of the battery pack. In this embodiment, the low-voltage power supply is 5V. In other embodiments, the low-voltage power supply can also be set according to requirements.

[0080] In some embodiments, an anti-reverse circuit is arranged in parallel at both ends of the main positive relay 2 and / or the heating relay 12, so as to avoid damage to the devices in the circuit caused by the sudden disconnection of the relay resulting in an increase in voltage.

[0081] In some embodiments, fuses (1, 6) are provided in front of the main positive relay 2 and / or the heating relay 12. By providing the fuses (1, 6), it is possible to avoid damage to the components in the circuit caused by the voltage of the control unit (the main control chip of the BMS) exceeding its withstand voltage value due to the sudden disconnection of the main positive relay 2 and / or the heating relay 12.

[0082] It should be noted that the main positive relay 2 and / or the heating relay 12 can be separately provided with an anti-reverse circuit, or separately provided with a fuse, or provided with both an anti-reverse circuit and a fuse at the same time.

[0083] In some embodiments, a shunt resistor 7 is provided between the main negative relay 9 and the negative pole of the high-voltage power supply unit.

[0084] In some embodiments, the charge and discharge circuit of the high-voltage power supply unit further includes: a heating film 11, which is connected in series with the heating relay 12 and is provided behind the heating relay 12. When the charge and discharge circuit of the high-voltage power supply unit is applied to a new energy vehicle, the BMS needs to effectively control the temperature when the battery pack (high-voltage power supply unit) starts, operates, and charges, which is particularly important for using an electric vehicle in a colder climate. The heating film can be used to maintain the battery temperature and ensure the battery performance and life.

[0085] The present application also provides an electrical device including the charge and discharge circuit of the high-voltage power supply unit as described in any of the above embodiments.

[0086] The present application also provides a relay detection method for the charge and discharge circuit of the high-voltage power supply unit. The charge and discharge circuit of the high-voltage power supply unit includes: a main negative relay 9, a pre-charge relay 3 provided with an auxiliary contact, and a main positive relay 2 provided with an auxiliary contact. For the specific steps of the relay detection method, please refer to the above Figure 2 and the corresponding description, which will not be elaborated here.

[0087] Figure 3 A model showing the relay detection method for the charge and discharge circuit of the high-voltage power supply unit provided in some embodiments of the present application is shown. As Figure 3 shown, the above relay detection method can be established through a MATLAB / Simulink model. The left side is the input data, the middle box is the data processing for the above relay detection method according to the input data on the left side, and the right side is the output data after processing.

[0088] Specifically, as shown in Table 1, the model includes 10 input analog signals, namely: the total voltage U of the battery pack pack , the second voltage U V2 (the voltage between PACK- and the high-voltage detection point V2), the auxiliary contact voltage U of the main positive relay 2 main , the auxiliary contact voltage U of the pre-charge relay 3 pre, Precharge Relay 3 Status (Pre_Rly_Staus), Main Positive Relay 2 Status (MainPos_Rly_Staus), Main Negative Relay 9 Status (MainNeg_Rly_Staus), Heating Relay 12 Status (Heat_Rly_Staus), and the third voltage U V3 (Voltage between PACK+ and high - voltage detection point V3) and the fourth voltage U V4 (Voltage between PACK+ and high - voltage detection point V4). And it also includes 4 output data, namely: Precharge Relay 3 Sticking Detection Result (Pre_Rly_WeldCheckResult), Main Positive Relay 2 Sticking Detection Result (MainPos_Rly_WeldCheckResult), Main Negative Relay 9 Sticking Detection Result (MainNeg_Rly_WeldCheckResult), and Heating Relay 12 Sticking Detection Result (Heat_Rly_WeldCheckResult).

[0089] Table 1 Model Simulation Signal Input and Output

[0090]

[0091] Figure 4 Shows a test case including 10 analog signal inputs provided according to some embodiments of the present application. As Figure 4 shown, it shows the input situation of 10 analog signals in the time period from 0 to 27 s. For example, the total voltage of the battery pack U pack is 500 V within 0 - 27 s (as shown by the uppermost red broken line segment in Figure 4 ).

[0092] The present application also conducts a back - to - back simulation test on the above - mentioned relay detection method. By means of analog signal input, it triggers the sticking faults of corresponding relays to determine whether the conditions for determining whether a relay is stuck in the above - mentioned detection method meet the strategy.

[0093] Figure 5 Shows a back - to - back test framework including 10 analog signal inputs provided according to some embodiments of the present application. As Figure 5 shown, the model - in - the - loop test and the software - in - the - loop test use the same test case analog signal input. For example, they both use the input data as shown in Figure 4 . The results show that the test output results are consistent with the relay detection method of the present application. In other words, the relay sticking situation determined according to the judgment conditions in the relay detection method is consistent with the test output results, that is, the relay detection method of the present application can accurately detect the sticking situation of relays.

[0094] Figure 6A block diagram of a SoC (System on Chip) provided according to some embodiments of the present application is shown. In Figure 6 , similar components have the same reference numerals. Additionally, the dashed boxes are optional features of a more advanced SoC. In Figure 6 , the SoC 1500 includes: an interconnect unit 1550, which is coupled to an application processor 1515; a system agent unit 1570; a bus controller unit 1580; an integrated memory controller unit 1540; one or more coprocessors 1520, which may include integrated graphics logic, an image processor, an audio processor, and a video processor; a static random access memory (SRAM) unit 1530; and a direct memory access (DMA) unit 1560. In one embodiment, the coprocessor 1520 includes a dedicated processor, such as, for example, a network or communication processor, a compression engine, a GPGPU, a high throughput MIC processor, or an embedded processor, etc.

[0095] Embodiments of the mechanisms disclosed in the present application may be implemented in hardware, software, firmware, or a combination of these implementation methods. Embodiments of the present application may be implemented as a computer program or program code executed on a programmable system, which includes at least one processor, a storage system (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device.

[0096] The program code may be applied to the input instructions to perform the various functions described in the present application and generate output information. The output information may be applied to one or more output devices in a known manner. For the purposes of the present application, a processing system includes any system having a processor such as, for example, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), or a microprocessor.

[0097] The program code may be implemented in a high-level procedural language or an object-oriented programming language in order to communicate with the processing system. When needed, the program code may also be implemented in assembly language or machine language. In fact, the mechanisms described in the present application are not limited to the scope of any particular programming language. In any case, the language may be a compiled language or an interpreted language.

[0098] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may also be implemented as instructions carried or stored on one or more transient or non-transitory machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors. For example, the instructions may be distributed via a network or via other computer-readable media. Thus, machine-readable media may include any mechanism for storing or transmitting information in a form readable by a machine (e.g., a computer), including but not limited to, floppy disks, optical disks, optical discs, compact discs read-only memory (CD-ROMs), magneto-optical discs, read-only memory (ROM), random access memory (RAM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic or optical cards, flash memory, or tangible machine-readable memories for transmitting information (e.g., carrier waves, infrared signals, digital signals, etc.) in electrical, optical, acoustic, or other forms via the Internet. Thus, machine-readable media include any type of machine-readable media suitable for storing or transmitting electronic instructions or information in a form readable by a machine (e.g., a computer).

[0099] In the drawings, some structural or method features may be shown in a particular arrangement and / or order. However, it should be understood that such a particular arrangement and / or ordering may not be required. Rather, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the illustrative drawings. Additionally, the inclusion of a structural or method feature in a particular figure does not imply that such a feature is required in all embodiments, and in some embodiments, such a feature may not be included or may be combined with other features.

[0100] It should be noted that each unit / module mentioned in the device embodiments of this application is a logical unit / module. Physically, a logical unit / module may be a physical unit / module, may be a part of a physical unit / module, or may be implemented as a combination of multiple physical units / module. The physical implementation manner of these logical units / module themselves is not the most important. The combination of the functions implemented by these logical units / module is the key to solving the technical problems proposed by this application. In addition, in order to highlight the innovative part of this application, the above device embodiments of this application do not introduce units / modules that are not closely related to solving the technical problems proposed by this application. This does not mean that there are no other units / modules in the above device embodiments.

[0101] It should be noted that in the examples and description of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one" does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0102] Each method embodiment of the present application can be implemented in ways such as software, magnetic media, firmware, etc.

[0103] The program code can be applied to the input instructions to perform the various functions described herein and generate output information. The output information can be applied to one or more output devices in a known manner. For the purposes of the present application, a processing system includes any system having a processor such as, for example, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), or a microprocessor.

[0104] The program code can be implemented in a high-level procedural language or an object-oriented programming language to communicate with the processing system. When needed, the program code can also be implemented in assembly language or machine language. In fact, the mechanisms described herein are not limited to the scope of any particular programming language. In any case, the language can be a compiled language or an interpreted language.

[0105] One or more aspects of at least one embodiment can be implemented by representative instructions stored on a computer-readable storage medium, the instructions representing various logics in a processor, and the instructions, when read by a machine, cause the machine to fabricate the logics for performing the techniques described herein. These representations, referred to as "IP cores", can be stored on a tangible computer-readable storage medium and provided to multiple customers or production facilities to be loaded into the manufacturing machines that actually fabricate the logics or processors.

[0106] In some cases, an instruction converter may be used to convert instructions from a source instruction set to a target instruction set. For example, the instruction converter may transform (e.g., using static binary translation, dynamic binary translation including dynamic compilation), morph, emulate, or otherwise convert the instructions into one or more other instructions to be processed by the IP core. The instruction converter may be implemented in software, hardware, firmware, or a combination thereof. The instruction converter may be on the processor, off the processor, or partially on the processor and partially off the processor.

[0107] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, those of ordinary skill in the art should understand that various changes in form and detail may be made therein without departing from the spirit and scope of the present application.

Claims

1. A relay detection method for a high voltage power supply unit charging and discharging circuit, characterized in that: The high-voltage power supply unit charging and discharging circuit includes: a main negative relay, a pre-charging relay with an auxiliary contact, and a main positive relay with an auxiliary contact, and the relay detection method includes: In the case that none of the main negative relay, the pre-charging relay and the main positive relay receives a closing instruction, determining whether the second voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold, wherein the closing instruction is used to indicate that the relay is in a closed state, and the second voltage is the voltage between the negative pole of the high-voltage power supply unit and a second voltage detection point, and the second voltage detection point is set after the main positive relay and / or the pre-charging relay; The relay detection method further includes any one of the following: When it is determined that the second voltage is less than the preset percentage of the total voltage of the high-voltage power supply unit or the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, it is determined that the pre-charge relay and the main positive relay are not stuck; In the case where it is determined that the second voltage is greater than or equal to the preset percentage of the total voltage of the high-voltage power supply unit and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, determining whether it can be maintained for a preset time length; In the case where it is determined that the preset time length cannot be maintained, determining that both the pre-charging relay and the main positive relay are not stuck; In the case where it is determined that the preset time length can be maintained, determining whether the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are both equal to the rated voltage of the auxiliary contact; In the case where it is determined that the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are both equal to the rated voltage of the auxiliary contacts thereof, it is determined that both the pre-charge relay and the main positive relay are adhered; When it is determined that the pre-charge auxiliary contact voltage and the main positive auxiliary contact voltage are not both equal to the rated voltage of their auxiliary contacts, determine whether the pre-charge auxiliary contact voltage is equal to the rated voltage of its auxiliary contact. If so, determine that the pre-charge relay is stuck, otherwise, determine that the main positive relay is stuck; or, determine whether the main positive auxiliary contact voltage is equal to the rated voltage of its auxiliary contact. If so, determine that the main positive relay is stuck, otherwise, determine that the pre-charge relay is stuck.

2. The relay detection method for a high voltage power supply unit charging and discharging circuit according to claim 1, characterized in that: The step of determining whether the second voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to a preset voltage threshold when none of the main negative relay, the pre-charge relay and the main positive relay receive a closing instruction further includes: Determine whether a third voltage is greater than or equal to a preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, wherein the third voltage is the voltage between the negative electrode of the high-voltage power supply unit and a third voltage detection point, and the third voltage detection point is set before the main negative relay; In the case where it is determined that the third voltage is less than the preset percentage of the total voltage of the high-voltage power supply unit or the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, determining that the main negative relay is not stuck; In the case where it is determined that the third voltage is greater than or equal to the preset percentage of the total voltage of the high-voltage power supply unit and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, determining whether it can be maintained for a preset time length; In the case where it is determined that the preset time length can be maintained, determining that the main negative relay is stuck; In the case where it is determined that the preset time length cannot be maintained, it is determined that the main negative relay is not stuck.

3. The relay detection method for a high voltage power supply unit charging and discharging circuit according to claim 2, characterized in that: Also includes: In the case where it is determined that the main negative relay, the pre-charge relay and the main positive relay are not stuck, the main negative relay and the main positive relay are closed after receiving the closing instruction.

4. The relay detection method for a high voltage power supply unit charging and discharging circuit according to claim 3, characterized in that: The high-voltage power supply unit charging and discharging circuit further includes: a heating relay, and after the step of closing the main negative relay and the main positive relay after receiving a closing instruction when it is determined that the main negative relay, the pre-charging relay and the main positive relay are not adhered, it also includes: Determine whether a fourth voltage is greater than or equal to the preset percentage of the total voltage of the high-voltage power supply unit and whether the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, wherein the fourth voltage is the voltage between the negative electrode of the high-voltage power supply unit and a fourth voltage detection point, and the fourth voltage detection point is set behind the heating relay; In the case where it is determined that the fourth voltage is less than the preset percentage of the total voltage of the high-voltage power supply unit or the total voltage of the high-voltage power supply unit is less than the preset voltage threshold, determining that the heating relay is not stuck; In the case where it is determined that the fourth voltage is greater than or equal to the preset percentage of the total voltage of the high-voltage power supply unit and the total voltage of the high-voltage power supply unit is greater than or equal to the preset voltage threshold, determining whether it can be maintained for a preset time length; In the case where it is determined that the preset time length can be maintained, determining that the heating relay is stuck; In the case where it is determined that the preset time length cannot be maintained, it is determined that the heating relay is not stuck.

5. The relay detection method for a high voltage power supply unit charging and discharging circuit according to claim 1, characterized in that: The preset percentage is 95%, and / or the preset time length is 2-5s, and / or the preset voltage threshold is 25V.

6. A high voltage power supply unit charging and discharging circuit, characterized in that: include: A high-voltage power supply unit, a main positive relay with auxiliary contacts, a pre-charging relay with auxiliary contacts, a pre-charging resistor, a main negative relay, an anti-reverse circuit and a control unit, wherein the pre-charging relay is connected in series with the pre-charging resistor and then connected in parallel with the main positive relay, and the anti-reverse circuit is connected in parallel with the main negative relay, wherein a third voltage detection point is provided in front of the main negative relay, and a second voltage detection point is provided after the main positive relay and / or the pre-charging relay, and the control unit is configured to be able to execute the relay detection method as described in any one of claims 1 to 5.

7. The high voltage power supply unit charging and discharging circuit according to claim 6, characterized in that: The anti-reverse circuit includes: a low-voltage power supply, a pull-up resistor, a voltage-stabilizing resistor, a voltage-dividing resistor and a diode, wherein one end of the pull-up resistor is respectively connected to the voltage-stabilizing resistor and the voltage-dividing resistor, and the other end of the pull-up resistor is provided with the third voltage detection point; and / or a fuse is provided in front of the main positive relay and / or the heating relay, and / or a shunt is provided between the main negative relay and the negative pole of the high-voltage power supply unit.

8. The high voltage power supply unit charging and discharging circuit according to claim 7, characterized in that: The anti-reverse circuit is arranged in parallel at both ends of the main positive relay and / or the heating relay.

9. The high voltage power supply unit charging and discharging circuit according to claim 6, characterized in that: Also includes: The heating film is connected in series with the heating relay and is arranged behind the heating relay, and / or the high-voltage power supply unit is a battery pack.

10. An electrical device, characterized in that: It comprises a high voltage power supply unit charging and discharging circuit as claimed in any one of claims 6 to 9.

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