Power battery monomer voltage validity detection method, monitoring method, device, medium and equipment

Abstract

The invention discloses a power battery monomer voltage validity detection method, a monitoring method, a device, a medium and equipment in the technical field of power batteries, and aims to solve the problem of single validity detection method in the prior art. The method comprises the following steps: collecting each string of monomer voltage of a power battery and bus current of the power battery; if the two sub-conditions are met at the same time, timing is started, the cumulative time is T, and the two sub-conditions include that the voltage of each string of monomers at the current moment is equal to the voltage of the string of monomers at the previous moment, and the absolute value of the bus current of the power battery is larger than a preset current value; when any one of the two sub-conditions is not met, T is reset; and when T is greater than or equal to the preset time, determining that the monomer voltage collected by the BMS in the power battery has an invalid value, otherwise, determining that the voltage is valid. According to the method, by adding voltage judgment of the current moment and the previous moment of the single voltage data and considering the influence of the bus current of the power battery, the effectiveness detection is more stable, and the false alarm probability is reduced.

Description

Technical Field

[0001] The present invention relates to a power battery cell voltage validity detection method, monitoring method, device, medium and equipment, belonging to the technical field. Background Art

[0002] Power batteries are usually composed of dozens to hundreds of battery cells. They are the core components of electric vehicle power systems and the power source of electric vehicles. Therefore, to ensure the reliable operation of power batteries, it is necessary to monitor the parameters of each string of battery cells in the power battery in real time, among which the most important parameter is the cell voltage. By monitoring the cell voltage, it is possible to determine whether the cell needs to be charged, whether it is fully charged, the SOC status, and whether there is a serious risk.

[0003] When judging the state of a battery cell based on its single cell voltage value, we must first ensure that the collected single cell voltage value is valid. Otherwise, we can only draw wrong conclusions based on invalid data. At present, the industry mainly relies on the diagnostic mechanism of the acquisition chip itself to determine whether the collected single cell voltage value is valid. When the communication is interrupted or the acquisition chip diagnosis fails, the validity of the single cell voltage cannot be determined. Therefore, testing the validity of the power single cell voltage from different dimensions is of great significance to ensure the normal operation of the power battery. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a power battery cell voltage validity detection method, monitoring method, device, medium and equipment.

[0005] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions.

[0006] In a first aspect, the present invention discloses a method for detecting the voltage validity of a power battery cell, comprising: Collect the voltage of each cell of the power battery and the bus current of the power battery; If two sub-conditions are met at the same time, the timing starts and the accumulated time is T. The two sub-conditions include: the voltage of each string of cells at the current moment is equal to the voltage of the string of cells at the previous moment and the absolute value of the power battery bus current is greater than the preset current value; When any one of the two sub-conditions is not met, the accumulated time T is reset; When the accumulated time T is greater than or equal to the preset time, it is determined that the single cell voltage collected by the BMS in the power battery has an invalid value, otherwise it is valid.

[0007] The above technical solution can make the effectiveness detection more stable and reduce the probability of false alarm by increasing the voltage judgment of the current and previous moments of the single cell voltage data and considering the influence of the power battery bus current.

[0008] Furthermore, it also includes: It is determined whether the voltage of each string of cells is within the valid range. If so, the voltage of the cells in the string is determined to be valid, otherwise it is invalid.

[0009] The above technical solution uses the MCU (Microcontroller Unit) on the BMS to calculate whether the single cell voltage data is within a reasonable range. MCU is a highly integrated chip used by BMS. It is the main chip of BMS and is used for data calculation and logic calculation of BMS functions. MCU can determine the validity of single cell voltage based on the value of single cell voltage. MCU is used to verify the data collected by the acquisition chip, and a mutual verification mechanism is adopted to ensure that the data is reliable and valid.

[0010] Furthermore, collecting the voltage of each cell string of the power battery includes: Receive the cell voltage data of the power battery collected by the battery management system BMS, perform CRC check on the cell voltage data, and determine whether the check passes. If so, it is determined that the cell voltage of the string is valid and the cell voltage of the string is extracted, otherwise it is invalid.

[0011] The above technical solution performs CRC check on the data packets transmitted by the acquisition chip through the MCU on the BMS to verify whether the data has been accidentally tampered with during the transmission process, ensuring that the data received by the MCU is consistent with the data sent by the acquisition chip.

[0012] Furthermore, if the single cell voltage data of the power battery collected by the battery management system BMS is not received, it is determined that the single cell voltage of the string is invalid.

[0013] The above technical solution determines the validity of the single cell voltage by judging whether the MCU on the BMS can receive the data from the acquisition chip in real time. The BMS has extremely high requirements for the real-time performance of the single cell voltage data. When the MCU does not receive the data sent by the acquisition chip, it reports the fault in time, indicating that the current single cell voltage data is unreliable and invalid, so as to avoid the BMS making judgments and calculations based on invalid and unupdated data.

[0014] Furthermore, if a collection fault flag sent by a collection chip in a battery management system BMS is received, it is determined that the voltage of the single cell string is invalid.

[0015] In the above technical solution, the acquisition chip has its own diagnostic mechanism, which will perform real-time diagnosis on the chip's own functions during the data acquisition process. When the chip operates abnormally, it will send an acquisition fault flag to the MCU in the BMS. Therefore, the acquisition fault flag sent by the acquisition chip can directly and effectively determine whether the acquisition device of the single voltage data is functioning normally, thereby determining the validity of the data source.

[0016] In a second aspect, the present invention discloses a method for detecting the voltage validity of a power battery cell, comprising: Collecting target data of the power battery, wherein the target data of the power battery includes single cell voltage data of the power battery collected by the battery management system BMS, collection fault flags of the battery management system BMS, and bus current of the power battery; Detecting the validity of the single cell voltage of the power battery according to the target data and the preset conditions; The preset conditions include: Condition 1: Receive the cell voltage data of the power battery collected by the battery management system BMS, perform CRC check on the cell voltage data, and determine whether the check passes. If so, it is determined that the cell voltage of the string is valid and the cell voltage of the string is extracted, otherwise it is invalid; Condition 2: If the single cell voltage data of the power battery collected by the battery management system BMS is not received, it is determined that the single cell voltage of the string is invalid; Condition 3: If the acquisition fault flag sent by the acquisition chip in the battery management system BMS is received, it is determined that the voltage of the single cell string is invalid; Condition 4: determine whether the voltage of each string of cells is within the valid range. If so, the voltage of the string of cells is determined to be valid, otherwise it is invalid; Condition 5: Collect the voltage of each cell of the power battery and the bus current of the power battery; If two sub-conditions are met at the same time, the timing starts and the accumulated time is T. The two sub-conditions include: the voltage of each string of cells at the current moment is equal to the voltage of the string of cells at the previous moment and the absolute value of the power battery bus current is greater than the preset current value; When any one of the two sub-conditions is not met, the accumulated time T is reset; When the accumulated time T is greater than or equal to the preset time, it is determined that the single cell voltage collected by the BMS in the power battery has an invalid value, otherwise it is valid.

[0017] The above technical solution detects and determines the validity of the single cell voltage through multiple conditions, avoiding the situation of fault omission due to failure of a single detection method, and is safer and more reliable.

[0018] In a third aspect, the present invention discloses a power battery monitoring method, comprising: Obtaining a cell voltage invalidity instruction detected by the power battery cell voltage validity detection method according to the first aspect or the second aspect, and controlling the vehicle as follows according to the cell voltage invalidity instruction: If the power battery is in charging condition, the battery management system BMS will immediately stop charging and disconnect the high voltage connection of the power battery; If the power battery is in a discharging condition, a control command to limit the vehicle's speed and a command to prompt the driver to send the vehicle to a maintenance point for inspection and maintenance are output.

[0019] The above technical solution, combined with the content of the validity detection method, can quickly identify the situation where the power battery cell voltage is invalid, and then give corresponding control to avoid the power battery from being overcharged or over-discharged and causing danger.

[0020] In a fourth aspect, the present invention discloses a power battery cell voltage validity detection device, comprising: The acquisition module is used to collect the voltage of each cell of the power battery and the bus current of the power battery; A processing module, configured to start timing when two sub-conditions are met at the same time, and the accumulated time is T, wherein the two sub-conditions include: the voltage of each cell string at the current moment is equal to the voltage of the corresponding cell at the previous moment, and the absolute value of the bus current of the power battery is greater than a preset current value; when any one of the two sub-conditions is not met, the accumulated time T is reset; The output module is used to output that the single cell voltage collected by the BMS in the power battery has an invalid value when the accumulated time T is greater than or equal to the preset time, otherwise the output is valid.

[0021] In a fifth aspect, the present invention discloses a computer-readable storage medium storing one or more programs, characterized in that the one or more programs include instructions, which, when executed by a computing device, enable the computing device to execute the method in the first aspect or the second aspect.

[0022] In a sixth aspect, the present invention discloses a computer device, comprising: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the method in the first aspect or the second aspect.

[0023] The beneficial effects achieved by the present invention are: The method of the first aspect of the present invention can make the effectiveness detection more stable and reduce the probability of false alarm by adding voltage judgment of the current moment and the previous moment of the single cell voltage data and considering the influence of the power battery bus current.

[0024] The method of the second aspect of the present invention, based on the acquisition chip diagnostic mechanism of the battery management system BMS, increases the voltage judgment of the single cell voltage data at the current moment and the previous moment and considers the influence of the power battery bus current, so as to make the effectiveness detection more stable and reduce the probability of false alarm; and detects and judges the effectiveness of the single cell voltage in multiple ways, avoiding the situation of fault omission due to the failure of a single detection method, which is safer and more reliable.

[0025] The method of the third aspect of the present invention, combined with the content of the validity detection method, can quickly identify the situation where the power battery cell voltage is invalid, and then give corresponding control to avoid the power battery from being overcharged or over-discharged and causing danger. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the signal transmission and high voltage connection principle of the present invention; Among them, 1. Power battery; 2. Battery management system BMS; 3. Battery cell; 4. Battery pack disconnect unit BDU; 5. Vehicle controller VCU; Figure 2 This is a flow chart of the detection of single cell voltage out of range; Figure 3 The detection flow chart for the single cell voltage is not updated; Figure 4 It is a detection flow chart of the working function of multiple judgment conditions of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] Embodiment 1: This embodiment introduces a method for detecting the voltage validity of a power battery cell, including: Collect the voltage V of each cell of the power battery Cell[i] And the power battery bus current I Pack ; If both sub-conditions are met at the same time, the timing starts and the accumulated time is T. The two sub-conditions include: the voltage V of each string at the current moment Cell[i] The voltage V of the string at the previous moment Cell[i]_0 Equal to the power battery bus current I Pack The absolute value is greater than 2A; When any one of the two sub-conditions is not met, the accumulated time T is reset; When the accumulated time T is greater than or equal to the preset time, it is determined that the single cell voltage collected by the BMS in the power battery has an invalid value, otherwise it is valid.

[0031] In this embodiment, by increasing the voltage judgment of the single cell voltage data at the current moment and the previous moment and considering the influence of the power battery bus current, the effectiveness detection can be made more stable and the probability of false alarm can be reduced.

[0032] The above technical solution can make the effectiveness detection more stable and reduce the probability of false alarm by increasing the voltage judgment of the current and previous moments of the single cell voltage data and considering the influence of the power battery bus current.

[0033] It also includes: judging whether the voltage of each string of cells is within the valid range. If so, the voltage of the cells in the string is determined to be valid, otherwise it is invalid. The MCU (Microcontroller Unit) on the BMS calculates whether the cell voltage data is within a reasonable range. MCU is a highly integrated chip used by BMS. It is the main chip of BMS and is used for data calculation and logic calculation of BMS functions. MCU can determine the validity of the cell voltage based on the value of the cell voltage. Use MCU to verify the data collected by the acquisition chip, and adopt a mutual verification mechanism to ensure that the data is reliable and valid.

[0034] The collecting of the voltage of each cell of the power battery includes: receiving the cell voltage data of the power battery collected by the battery management system BMS, performing CRC check on the cell voltage data, judging whether the check is passed, and if so, determining that the cell voltage of the string is valid, extracting the cell voltage of the string, otherwise invalid. The MCU on the BMS performs CRC check on the data packet transmitted by the collection chip to verify whether the data is accidentally tampered with during the transmission process, and ensure that the data received by the MCU is consistent with the data sent by the collection chip.

[0035] If the single cell voltage data of the power battery collected by the battery management system BMS is not received, it is determined that the voltage of the single cell in the string is invalid. The MCU on the BMS determines whether the data from the acquisition chip can be received in real time to determine the validity of the single cell voltage. The BMS has extremely high requirements for the real-time performance of the single cell voltage data. When the MCU does not receive the data sent by the acquisition chip, it reports the fault in time, indicating that the current single cell voltage data is unreliable and invalid, avoiding the BMS from making judgments and calculations based on invalid and unupdated data.

[0036] If the acquisition fault flag sent by the acquisition chip in the battery management system BMS is received, it is determined that the voltage of the single cell string is invalid. The acquisition chip has its own diagnostic mechanism, which will perform real-time diagnosis of the chip's own functions during the data acquisition process. When the chip operates abnormally, it sends an acquisition fault flag to the MCU in the BMS. Therefore, the acquisition fault flag sent by the acquisition chip can directly and effectively determine whether the acquisition device function of the single cell voltage data is normal, thereby determining the validity of the data source.

[0037] Embodiment 2 is based on the same inventive concept as Embodiment 1. This embodiment introduces a method for detecting the voltage validity of a power battery cell. Figure 1 As shown, the vehicle controller VCU5 exchanges information with the battery management system BMS2, and the battery pack disconnecting unit BDU4 is connected in series with a plurality of battery cells 3 to form a power battery 1.

[0038] like Figure 4 As shown, when any of the following conditions 1)-5) is met, the power battery cell voltage is considered invalid: 1) Single cell voltage data verification fails. The single cell voltage data collected by the BMS acquisition chip is transmitted to the MCU through daisy chain communication. The MCU will perform CRC verification on the received data. When the data verification fails, the single cell voltage is considered invalid. The CRC verification of communication data is a general function that is easy to implement in the industry and will not be elaborated here.

[0039] 2) When the MCU does not receive the single cell voltage data sent by the acquisition chip, that is, the communication data is lost, the single cell voltage is considered invalid; communication data loss detection is a general function that is easy to implement in the industry and will not be elaborated here.

[0040] 3) When the acquisition chip detects that its own acquisition function is abnormal, it will send the relevant fault flag to the MCU. For example, if the ADC reference is abnormal, the single cell voltage is considered invalid. The internal abnormality detection of the acquisition chip needs to refer to the user manual of the acquisition chip, which is not explained in detail here.

[0041] 4) If Figure 2 Therefore, any string of monomer voltage V Cell [i] Greater than 4.5V or any string voltage V Cell [i] When it is less than 0.5V, the cell voltage is not within the valid range and is considered invalid; 5) If Figure 3 As shown, if the current voltage of each string is V Cell[i] Compared with the previous moment, each string of monomers V Cell[i]_0 Completely equal, and the power battery bus current: I Pack If the absolute value of is greater than 2A, the timing starts and the accumulated time is T. When any of the above two sub-conditions is not met, the timing time T is reset. When T is greater than or equal to 30 seconds, that is, the single cell voltage is not updated, the single cell voltage is considered invalid. The single cell voltage value should be accurate to mV. For a power battery, it usually contains more than 100 strings of cells, and the collected single cell voltage value is accurate to 3 decimal places, that is, accurate to mV. At the same time, the update cycle of the single cell voltage does not exceed 100ms. Therefore, when the discharge or charging current is greater than 2A, it is impossible for the single cell voltage value of each string in the power battery to remain unchanged for a period of time. Therefore, when the discharge or charging current is greater than 2A, within 30 seconds, the single cell voltage of each string of cells in the power battery remains unchanged from the value at the previous moment, which is an abnormal situation and the single cell voltage should be reported as invalid. The above 2A and 30 seconds are for ease of understanding, and the defined values ​​can be defined as other reasonable values ​​in other embodiments.

[0042] Embodiment 3, based on the same inventive concept as other embodiments, this embodiment introduces a power battery monitoring method, including: During the charging or discharging process of the power battery, Figure 4As shown in the figure, when any one of the conditions in the figure is met, the collected power battery cell voltage is considered invalid. At this time, the BMS cannot effectively monitor the cell voltage of each string of cells in the power battery, and the BMS reports the fault to the VCU. For example, under charging conditions, the VCU should send an instruction to the BMS to stop charging immediately, disconnect the relay in the BDU, and disconnect the high-voltage connection to avoid overcharging of the power battery and causing danger. Under discharging conditions, after the VCU receives the invalid cell voltage signal from the BMS, it should limit the vehicle's driving speed, limit the power output, and prompt the driver to send the vehicle to the maintenance point for inspection and maintenance as soon as possible.

[0043] Embodiment 4, the present invention discloses a power battery cell voltage validity detection device, comprising: The acquisition module is used to collect the voltage of each cell of the power battery and the bus current of the power battery; A processing module, configured to start timing when two sub-conditions are met at the same time, and the accumulated time is T, wherein the two sub-conditions include: the voltage of each cell string at the current moment is equal to the voltage of the corresponding cell at the previous moment, and the absolute value of the bus current of the power battery is greater than a preset current value; when any one of the two sub-conditions is not met, the accumulated time T is reset; The output module is used to output that the single cell voltage collected by the BMS in the power battery has an invalid value when the accumulated time T is greater than or equal to the preset time, otherwise the output is valid.

[0044] Embodiment 5 is based on the same inventive concept as other embodiments. This embodiment introduces a computer-readable storage medium storing one or more programs, wherein the one or more programs include instructions, and when the instructions are executed by a computing device, the computing device executes the method in Embodiment 1.

[0045] Embodiment 6, based on the same inventive concept as other embodiments, this embodiment introduces a computer device, including: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the method described in Example 2 or Example 3.

[0046] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0047] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0048] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0049] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for detecting the voltage validity of a power battery cell, characterized in that: include: Collect the voltage of each cell of the power battery and the bus current of the power battery; If two sub-conditions are met at the same time, the timing starts and the accumulated time is T. The two sub-conditions include: the voltage of each string of cells at the current moment is equal to the voltage of the corresponding cell at the previous moment and the absolute value of the power battery bus current is greater than the preset current value; When any one of the two sub-conditions is not met, the accumulated time T is reset; When the accumulated time T is greater than or equal to the preset time, it is determined that the single cell voltage collected by the BMS in the power battery has an invalid value, otherwise it is valid.

2. The method for detecting the voltage validity of a power battery cell according to claim 1, characterized in that: Also includes: It is determined whether the voltage of each string of cells is within the valid range. If so, the voltage of the cells in the string is determined to be valid, otherwise it is invalid.

3. The power battery cell voltage validity detection method according to any one of claim 1, characterized in that: The collecting of the voltage of each single cell string of the power battery includes: Receive the cell voltage data of the power battery collected by the battery management system BMS, perform CRC check on the cell voltage data, and determine whether the check passes. If so, it is determined that the cell voltage of the string is valid and the cell voltage of the string is extracted; otherwise, it is invalid.

4. The power battery cell voltage validity detection method according to claim 3, characterized in that: If the single cell voltage data of the power battery collected by the battery management system BMS is not received, it is determined that the single cell voltage of the string is invalid.

5. The power battery cell voltage validity detection method according to claim 3, characterized in that: If a collection fault flag sent by the collection chip in the battery management system BMS is received, it is determined that the voltage of the single cell string is invalid.

6. A method for detecting the voltage validity of a power battery cell, characterized in that: include: Collecting target data of the power battery, wherein the target data of the power battery includes single cell voltage data of the power battery collected by the battery management system BMS, collection fault flags of the battery management system BMS, and bus current of the power battery; Detecting the validity of the single cell voltage of the power battery according to the target data and the preset conditions; The preset conditions include: Condition 1: Receive the cell voltage data of the power battery collected by the battery management system BMS, perform CRC check on the cell voltage data, and determine whether the check passes. If so, it is determined that the cell voltage of the string is valid and the cell voltage of the string is extracted, otherwise it is invalid; Condition 2: If the single cell voltage data of the power battery collected by the battery management system BMS is not received, it is determined that the single cell voltage of the string is invalid; Condition 3: If the acquisition fault flag sent by the acquisition chip in the battery management system BMS is received, it is determined that the voltage of the single cell string is invalid; Condition 4: determine whether the voltage of each string of cells is within the valid range. If so, the voltage of the string of cells is determined to be valid, otherwise it is invalid; Condition 5: Collect the voltage of each cell of the power battery and the bus current of the power battery; If two sub-conditions are met at the same time, the timing starts and the accumulated time is T. The two sub-conditions include: the voltage of each string of cells at the current moment is equal to the voltage of the string of cells at the previous moment and the absolute value of the power battery bus current is greater than the preset current value; When any one of the two sub-conditions is not met, the accumulated time T is reset; When the accumulated time T is greater than or equal to the preset time, it is determined that the single cell voltage collected by the BMS in the power battery has an invalid value, otherwise it is valid.

7. A power battery monitoring method, characterized in that: include: Obtaining a cell voltage invalid instruction detected by the power battery cell voltage validity detection method according to any one of claims 1 to 5 or claim 6, and controlling the vehicle as follows according to the cell voltage invalid instruction: If the power battery is in charging condition, the battery management system BMS will immediately stop charging and disconnect the high voltage connection of the power battery; If the power battery is in a discharging condition, a control instruction to limit the vehicle's speed and an instruction to prompt the driver to send the vehicle to a maintenance point for inspection and maintenance are output.

8. A power battery cell voltage validity detection device, characterized in that: include: The acquisition module is used to collect the voltage of each cell of the power battery and the bus current of the power battery; A processing module, configured to start timing when two sub-conditions are met at the same time, and the accumulated time is T, wherein the two sub-conditions include: the voltage of each cell string at the current moment is equal to the voltage of the corresponding cell at the previous moment, and the absolute value of the bus current of the power battery is greater than a preset current value; when any one of the two sub-conditions is not met, the accumulated time T is reset; The output module is used to output that the single cell voltage collected by the BMS in the power battery has an invalid value when the accumulated time T is greater than or equal to the preset time, otherwise the output is valid.

9. A computer-readable storage medium storing one or more programs, characterized in that: The one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform the method of any one of claims 1 to 5 or claim 6.

10. A computer device, characterized in that: include, One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing any of the methods described in claims 1-5 or claim 6.

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