A battery management system key signal fault detection device, method and vehicle

Abstract

The application discloses a kind of battery management system key signal fault detection device, method and vehicle, belong to the technical field of fault detection, including respectively with MCU microprocessor control unit connection SPI communication line and MOS control unit electric connection, the SPI communication line is electrically connected with key signal acquisition unit, the MOS control unit is electrically connected with key signal acquisition unit and voltage regulating unit respectively, the voltage regulating unit is electrically connected with the voltage to be measured by voltage sampling line.The application can be controlled by MCU microprocessor control unit internal program whether to open redundant channel check, reduce battery management system power consumption;If key signal acquisition unit key signal acquisition value appears abnormal, MCU microprocessor control unit end key signal acquisition value can be used as backup input signal, maintain battery management system data processing and calculation in short time, include the possibility of SPI fault, and fault coverage is more comprehensive and cost is lower.

Description

Technical Field

[0001] This invention discloses a fault detection device, method, and vehicle for a key signal of a battery management system, belonging to the technical field of fault detection. Background Technology

[0002] Current battery management systems can only identify faults in the critical signal acquisition circuit. They cannot detect faults in the critical signal acquisition unit itself or in the communication between the critical signal acquisition unit and the main chip, making troubleshooting difficult. Using only a single-channel AD acquisition system can lead to false alarms and missed alarms when such faults occur, and delayed handling could endanger driver safety. Summary of the Invention

[0003] This invention provides a key signal fault detection device, method, and vehicle for a battery management system. By using a key signal acquisition unit and an MCU microprocessor control unit for dual AD channel sampling, it can identify line faults and chip or chip communication faults, effectively saving troubleshooting time and costs.

[0004] The problem to be solved by this invention is achieved by the following technical solution:

[0005] According to a first aspect of the present invention, a fault detection device for a key signal of a battery management system is provided, comprising an SPI communication line and a MOS control unit electrically connected to an MCU microprocessor control unit respectively, the SPI communication line being electrically connected to a key signal acquisition unit, the MOS control unit being electrically connected to a key signal acquisition unit and a voltage regulation unit respectively, and the voltage regulation unit being electrically connected to the voltage to be measured via a voltage sampling line.

[0006] Preferably, the voltage regulation unit includes a high-voltage module electrically connected to the voltage to be measured via a voltage sampling line, the high-voltage module electrically connected to an isolation protection module, the isolation protection module electrically connected to a voltage divider module, the voltage divider module electrically connected to a low-voltage module, and the low-voltage module electrically connected to the key signal acquisition ports of the MOS control unit and the key signal acquisition unit, respectively.

[0007] Preferably, the high-voltage module is used to receive the voltage to be measured and generate a high voltage value; the isolation protection module is used for safety isolation, overvoltage protection and voltage stabilization; the voltage divider module is used to adjust the voltage value within the range of the key signal acquisition port of the key signal acquisition unit and the MCU microprocessor control unit according to the voltage division ratio; and the low-voltage module is used to output the voltage value.

[0008] Preferably, the SPI communication port of the key signal acquisition unit is electrically connected to the SPI communication port of the microprocessor control unit via an SPI communication line.

[0009] Preferably, the key signal acquisition unit is used to convert analog signals into digital signals and communicate with the microprocessor control unit via SPI signals.

[0010] Preferably, the redundant key signal acquisition port of the MCU microprocessor control unit is electrically connected to the low-voltage module of the voltage divider module through the MOS control unit, and the redundant key signal acquisition enable port of the MCU microprocessor control unit is electrically connected to the MOS control unit.

[0011] According to a second aspect of the present invention, a method for detecting faults in critical signals of a battery management system is provided, characterized in that it includes:

[0012] The MCU microprocessor control unit obtains the low-voltage module voltage value of the current voltage regulation unit through the key signal acquisition unit;

[0013] The first actual voltage value is obtained by voltage division based on the low-voltage module voltage value of the current voltage regulating unit;

[0014] Determine whether the actual voltage value exceeds the theoretical operating voltage range:

[0015] Yes, the MCU microprocessor control unit sends a turn-on signal to the MOS control unit to execute the next step;

[0016] No, repeatedly obtain the low-voltage module voltage value of the current voltage regulating unit;

[0017] The MCU microprocessor control unit obtains the non-conversion voltage value of the low-voltage module of the current voltage regulation unit through the MOS control unit;

[0018] The second actual voltage value is obtained by voltage division based on the non-conversion voltage value of the low-voltage module of the current voltage regulation unit;

[0019] Whether the absolute value of the difference between the first actual voltage value and the second actual voltage value exceeds the set allowable error value is determined by:

[0020] Yes, if the fault is identified as a critical signal acquisition unit or SPI communication failure, immediately send the fault information and quickly execute the system power-down procedure.

[0021] No, if the fault is determined to be a sampling line fault, the fault is immediately sent, and the second actual voltage value is used for calculation to maintain the operation until the end of this driving cycle.

[0022] Preferably, before the MCU microprocessor control unit obtains the low-voltage module voltage value of the current voltage regulation unit through the key signal acquisition unit, the following steps are included:

[0023] The MCU microprocessor control unit sends a request to the key signal acquisition unit to obtain the low-voltage module voltage value of the current voltage regulation unit;

[0024] According to a third aspect of the present invention, a power battery pack is provided, including the battery management system key signal fault detection device described in the first aspect.

[0025] According to a fourth aspect of the present invention, a vehicle is provided, including a vehicle body and a power battery pack as described in the third aspect.

[0026] The advantages of this invention compared to existing technologies are as follows:

[0027] This invention discloses a critical signal fault detection device, method, and vehicle for a battery management system. It can control whether redundant channel verification needs to be enabled through the internal program of the MCU microprocessor control unit, thereby reducing the power consumption of the battery management system. If the critical signal acquisition value of the critical signal acquisition unit is abnormal, the critical signal acquisition value at the MCU microprocessor control unit can be used as a backup input signal to maintain the data processing and calculation of the battery management system for a short period of time. It includes the possibility of SPI faults, with comprehensive fault coverage and low cost. Attached Figure Description

[0028] Figure 1 This is an electrical connection diagram of a key signal fault detection device for a battery management system according to the present invention.

[0029] Figure 2 This is a flowchart of a method for detecting critical signal faults in a battery management system according to the present invention.

[0030] in:

[0031] 100-MCU microprocessor control unit;

[0032] 200 - Key Signal Acquisition Unit;

[0033] 300-MOS control unit. Detailed Implementation

[0034] The following is based on the appendix Figure 1-2 The present invention will be further described as follows:

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] like Figure 1 As shown, the first embodiment of the present invention provides a key signal fault detection device for a battery management system based on the prior art, including: an MCU microprocessor control unit 100, a key signal acquisition unit 200, an SPI communication line, a voltage regulation unit, a voltage sampling line, and a MOS control unit 300. The connection relationship of the above components will be described in detail below.

[0039] First, let's introduce the voltage regulation unit. The voltage regulation unit includes a high-voltage module, an isolation protection module, a voltage divider module, and a low-voltage module. The HV0, HV1, HV2, and HV3 interfaces of the high-voltage module are electrically connected to the voltage to be measured via voltage sampling lines. It is used to receive the voltage to be measured and generate a higher voltage value. The high-voltage module is electrically connected to the isolation protection module, which is used for safety isolation, overvoltage protection, and voltage stabilization. The isolation protection module is electrically connected to the voltage divider module, which is used to adjust the voltage value within the range of the key signal acquisition ports of the key signal acquisition unit 200 and the MCU microprocessor control unit 100 according to the voltage division ratio. The voltage divider module is electrically connected to the low-voltage module. The low-voltage module is electrically connected to the key signal acquisition ports of the MOS control unit 300 and the key signal acquisition unit 200, respectively. The LV0, LV1, LV2, and LV3 interfaces of the low-voltage module are used to output voltage values. The low-voltage module periodically reads the voltage value of the low-voltage module of the voltage regulation unit.

[0040] The SPI communication port of the key signal acquisition unit 200 is electrically connected to the SPI communication port of the microprocessor control unit through the SPI communication line. The low-voltage signal is transmitted to the key signal acquisition unit and the sampled data is converted from analog to digital. Communication with the MCU microprocessor control unit is realized through the SPI signal. The key signal acquisition unit 200 adopts ADBMS2950.

[0041] The redundant critical signal acquisition ports of the MCU microprocessor control unit 100 are P0.0, P0.1, P0.2, and P0.3, which are electrically connected to the low-voltage module of the voltage divider module through the MOS control unit 300 for sampling critical signal acquisition signals. The redundant critical signal acquisition enable port of the MCU microprocessor control unit 100 is P0.4, which is electrically connected to the MOS control unit and controls the on / off state of the MOS transistor. The redundant critical signal acquisition ports are configured as ADC ports, the redundant critical signal acquisition enable port is configured as DIO ports, and the SPI communication ports are MOSI, MISO, SCLK, and CS. Their configurations are consistent with the configurations of the critical signal acquisition units connected to them. When the output of the redundant critical signal acquisition enable port is high, the MOS control unit is turned on, and the redundant critical signal acquisition port of the MCU microprocessor control unit receives the critical signal acquisition signal for sampling. When the output of the redundant critical signal acquisition enable port is low, the MOS control unit is turned off, the redundant critical signal acquisition port of the MCU microprocessor control unit is left floating, and the critical signal acquisition function is turned off. The MCU microprocessor control unit 100 uses a TC275.

[0042] The MOS control unit 300 consists of four sets of MOS transistors. By changing the level state of the redundant key signal acquisition enable port of the MCU microprocessor control unit, the on / off state of the MOS transistors is changed, thereby controlling the on / off state of the four sets of redundant key signal acquisition ports of the MCU microprocessor control unit.

[0043] like Figure 2 As shown, the second embodiment of the present invention provides a method for detecting faults in key signals of a battery management system based on the first embodiment, the specific steps of which include:

[0044] The MCU microprocessor control unit 100 sends a request to the key signal acquisition unit 200 to obtain the low-voltage module voltage value of the current voltage regulation unit;

[0045] The MCU microprocessor control unit 100 obtains the low-voltage module voltage value of the current voltage regulation unit through the key signal acquisition unit 200;

[0046] The first actual voltage value is obtained by voltage division based on the current low-voltage module voltage value of the voltage regulating unit;

[0047] Determine whether the actual voltage value exceeds the theoretical operating voltage range:

[0048] Yes, the MCU microprocessor control unit 100 sends a conduction signal to the MOS control unit 300, that is, the redundant key signal acquisition enable port P0.4 of the MCU microprocessor control unit jumps from low level to high level to execute the next step;

[0049] No, repeat the acquisition of the low-voltage module voltage value of the current voltage regulation unit;

[0050] The MCU microprocessor control unit 100 obtains the non-conversion voltage value of the low-voltage module of the current voltage regulation unit through the MOS control unit 300;

[0051] The second actual voltage value is obtained by voltage division based on the non-conversion voltage value of the low-voltage module of the current voltage regulation unit;

[0052] Whether the set allowable error value is exceeded is determined by the absolute value of the difference between the first actual voltage value and the second actual voltage value.

[0053] Yes, if the fault is identified as a critical signal acquisition unit or SPI communication failure, immediately send the fault information and quickly execute the system power-down procedure.

[0054] No, if the fault is determined to be a sampling line fault, the fault is immediately sent, and the second actual voltage value is used for calculation to maintain the operation until the end of this driving cycle.

[0055] The third embodiment of the present invention provides a power battery pack based on the first embodiment, including the battery management system key signal fault detection device described in the first embodiment.

[0056] The fourth embodiment of the present invention provides a vehicle based on the third embodiment, including a vehicle body and the power battery pack described in the third embodiment.

[0057] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Other modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A method for detecting critical signal faults in a battery management system, used to control a critical signal fault detection device for a battery management system, the critical signal fault detection device comprising an SPI communication line electrically connected to an MCU microprocessor control unit (100) and a MOS control unit (300), the SPI communication line electrically connected to a critical signal acquisition unit (200), the MOS control unit (300) electrically connected to the critical signal acquisition unit (200) and a voltage regulation unit, the voltage regulation unit being electrically connected to the voltage to be measured via a voltage sampling line, characterized in that... include: The MCU microprocessor control unit (100) acquires the low-voltage module voltage value of the current voltage regulating unit through the key signal acquisition unit (200); performs voltage division processing based on the low-voltage module voltage value of the current voltage regulating unit to obtain a first actual voltage value; determines whether the first actual voltage value exceeds the theoretical working voltage range: if yes, the MCU microprocessor control unit (100) sends a conduction signal to the MOS control unit (300) to execute the next step; if no, it repeatedly acquires the low-voltage module voltage value of the current voltage regulating unit; the MCU microprocessor control unit (100) acquires the non-conversion voltage value of the low-voltage module of the current voltage regulating unit through the MOS control unit (300); performs voltage division processing based on the non-conversion voltage value of the low-voltage module of the current voltage regulating unit to obtain a second actual voltage value; determines whether the absolute value of the difference between the first actual voltage value and the second actual voltage value exceeds the set allowable error value: if yes, it is determined to be a key signal acquisition unit or SPI communication failure, immediately sends a fault and quickly executes the system power-down process; No, if the fault is determined to be a sampling line fault, the fault is immediately sent, and the second actual voltage value is used for calculation to maintain the operation until the end of this driving cycle.

2. The method for detecting faults in key signals of a battery management system according to claim 1, characterized in that, The voltage regulation unit includes a high-voltage module electrically connected to the voltage to be measured via a voltage sampling line, the high-voltage module electrically connected to an isolation protection module, the isolation protection module electrically connected to a voltage divider module, the voltage divider module electrically connected to a low-voltage module, and the low-voltage module electrically connected to the key signal acquisition ports of the MOS control unit (300) and the key signal acquisition unit (200), respectively.

3. The method for detecting faults in key signals of a battery management system according to claim 2, characterized in that, The high-voltage module is used to receive the voltage to be measured and generate a high voltage value. The isolation protection module is used for safety isolation, overvoltage protection and voltage stabilization. The voltage divider module is used to adjust the voltage value within the range of the key signal acquisition port of the key signal acquisition unit (200) and the MCU microprocessor control unit (100) according to the voltage division ratio. The low-voltage module is used to output the voltage value.

4. The method for detecting faults in key signals of a battery management system according to claim 3, characterized in that, The SPI communication port of the key signal acquisition unit (200) is electrically connected to the SPI communication port of the microprocessor control unit through an SPI communication line.

5. The method for detecting faults in key signals of a battery management system according to claim 4, characterized in that, The key signal acquisition unit (200) is used to convert analog quantities into digital quantities and communicate with the microprocessor control unit via SPI signal.

6. The method for detecting faults in key signals of a battery management system according to claim 5, characterized in that, The redundant key signal acquisition port of the MCU microprocessor control unit (100) is electrically connected to the low-voltage module of the voltage divider module through the MOS control unit (300), and the redundant key signal acquisition enable port of the MCU microprocessor control unit (100) is electrically connected to the MOS control unit.

7. The method for detecting faults in key signals of a battery management system according to claim 6, characterized in that, Before the MCU microprocessor control unit (100) obtains the low-voltage module voltage value of the current voltage regulating unit through the key signal acquisition unit (200), the MCU microprocessor control unit (100) sends a request to the key signal acquisition unit (200) to obtain the low-voltage module voltage value of the current voltage regulating unit.

8. A power battery pack, characterized in that, The method includes a fault detection method for critical signals of a battery management system as described in any one of claims 1 to 7.

9. A vehicle, characterized in that, It includes the vehicle body and the power battery pack as described in claim 8.

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