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CN-115774205-B - Method, device and storage medium for determining state of single battery

CN115774205BCN 115774205 BCN115774205 BCN 115774205BCN-115774205-B

Abstract

The invention discloses a method, a device and a storage medium for determining the state of a single battery. The method comprises the steps of obtaining first voltage data of any one single battery in a single battery pack of a vehicle, determining second voltage data of any one single battery in a preset time period based on the first voltage data, determining a variance value of the second voltage data of any one single battery based on the second voltage data, wherein the variance value is used for representing a fluctuation state of any one single battery in the preset time period, and determining that the state of any one single battery is a normal state or an abnormal state based on the variance value. The invention solves the technical problems that the calculation amount of the diagnosis method for the thermal runaway risk of the power battery is large and the online application cannot be realized.

Inventors

  • MA SHAODONG
  • SUN HUANLI
  • WANG SHUYANG
  • LI XUE
  • XU LICHAO

Assignees

  • 中国第一汽车股份有限公司

Dates

Publication Date
20260512
Application Date
20221213

Claims (9)

  1. 1. A method of determining a state of a cell, comprising: Acquiring first voltage data of any one single battery in a single battery pack of a vehicle, wherein the first voltage data is normal voltage data of the any one single battery; determining second voltage data of any one single battery in a preset time period based on the first voltage data; Determining a variance value of the second voltage data of any one single battery based on the second voltage data, wherein the variance value is used for representing the fluctuation state of the any one single battery in the preset time period; Determining that the state of any one single battery is a normal state or an abnormal state based on the variance value; The method further comprises the steps of moving the preset time period backwards in a time dimension for target time after the state of any one single battery is the abnormal state, updating the preset time period, intercepting the first voltage data based on the updated preset time period, and determining the second voltage data.
  2. 2. The method of claim 1, wherein acquiring first voltage data for any one of the battery cells in the battery cell stack of the vehicle comprises: acquiring third voltage data of any one single battery; And reserving the voltage data in the third voltage data within a preset voltage data range to obtain the first voltage data.
  3. 3. The method of claim 1, wherein determining second voltage data for the any one of the cells within a preset time period based on the first voltage data comprises: intercepting the first voltage data by adopting the preset time period to obtain the second voltage data.
  4. 4. The method of claim 1, wherein determining that the state of any one of the cells is a normal state or an abnormal state based on the variance value comprises: determining the state of any one single battery as the normal state in response to the variance value being smaller than or equal to a preset variance value; and determining the state of any one single battery as the abnormal state in response to the variance value being larger than the preset variance value.
  5. 5. The method of claim 4, wherein after determining that the state of any one of the battery cells is the abnormal state in response to the variance value being greater than the preset variance value, the method further comprises: And outputting prompt information, wherein the prompt information is used for representing that the state of any single battery is the abnormal state.
  6. 6. An apparatus for determining the status of a cell, comprising: An obtaining unit, configured to obtain first voltage data of any one of the unit batteries in the unit battery group of the vehicle, where the first voltage data is normal voltage data of the any one of the unit batteries; A first determining unit configured to determine second voltage data of the any one of the unit cells within a preset period of time based on the first voltage data; A second determining unit, configured to determine a variance value of the second voltage data of the any one of the unit cells based on the second voltage data, where the variance value is used to characterize a fluctuation state of the any one of the unit cells in the preset time period; a third determining unit configured to determine, based on the variance value, whether the state of the arbitrary one of the single batteries is a normal state or an abnormal state; The device is further used for moving the preset time period backwards in the time dimension for target time after the state of any single battery is the abnormal state, updating the preset time period, intercepting the first voltage data based on the updated preset time period and determining the second voltage data.
  7. 7. A processor for running a program, wherein the program when run performs the method of any one of claims 1 to 5.
  8. 8. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 5.
  9. 9. A vehicle for performing the method of any one of claims 1 to 5.

Description

Method, device and storage medium for determining state of single battery Technical Field The present invention relates to the field of vehicles, and in particular, to a method, an apparatus, and a storage medium for determining a state of a single battery. Background At present, there are many diagnostic methods for the risk of thermal runaway of a power battery, such as a multi-level 3 sigma screening method, an entropy weight method, an entropy-based fault diagnosis method and the like, but the methods have the problems of large calculation amount and difficult real-time online application. Aiming at the technical problems that the power battery thermal runaway risk diagnosis method is large in calculated amount and cannot be applied online, no effective solution is proposed at present. Disclosure of Invention The embodiment of the invention provides a method, a device and a storage medium for determining the state of a single battery, which are used for at least solving the technical problems that the calculation amount of a diagnosis method for the thermal runaway risk of a power battery is large and the online application cannot be realized. According to one aspect of an embodiment of the present invention, a method of determining a state of a single battery is provided. The method comprises the steps of obtaining first voltage data of any one single battery in a single battery pack of a vehicle, determining second voltage data of any one single battery in a preset time period based on the first voltage data, determining a variance value of the second voltage data of any one single battery based on the second voltage data, wherein the variance value is used for representing a fluctuation state of any one single battery in the preset time period, and determining that the state of any one single battery is a normal state or an abnormal state based on the variance value. Optionally, acquiring the first voltage data of any one of the single batteries in the single battery pack of the vehicle comprises acquiring third voltage data of any one of the single batteries, and reserving the voltage data in the third voltage data within a preset voltage data range to obtain the first voltage data. Optionally, determining the second voltage data of any one of the single batteries within the preset time period based on the first voltage data includes intercepting the first voltage data by using the preset time period to obtain the second voltage data. Optionally, determining that the state of any one of the single batteries is a normal state or an abnormal state based on the variance value includes determining that the state of any one of the single batteries is a normal state in response to the variance value being less than or equal to a preset variance value, and determining that the state of any one of the single batteries is an abnormal state in response to the variance value being greater than the preset variance value. Optionally, after determining that the state of any one of the single batteries is an abnormal state in response to the variance value being greater than the preset variance value, the method further includes outputting prompt information, wherein the prompt information is used for representing that the state of any one of the single batteries is an abnormal state. Optionally, after the prompt message is output, the method further comprises the steps of moving the preset time period backwards in the time dimension for target time, updating the preset time period, intercepting the first voltage data based on the updated preset time period, and determining the second voltage data. According to an aspect of an embodiment of the present invention, there is provided an apparatus for determining a state of a single battery. The device comprises an acquisition unit, a first determination unit, a second determination unit and a third determination unit, wherein the acquisition unit is used for acquiring first voltage data of any one single battery in a single battery pack of a vehicle, the first voltage data are normal voltage data of any one single battery, the first determination unit is used for determining second voltage data of any one single battery in a preset time period based on the first voltage data, the second determination unit is used for determining a variance value of the second voltage data of any one single battery based on the second voltage data, the variance value is used for representing a fluctuation state of any one single battery in the preset time period, and the third determination unit is used for determining that the state of any one single battery is a normal state or an abnormal state based on the variance value. According to another aspect of an embodiment of the present invention, there is also provided a computer-readable storage medium. The computer readable storage medium includes a stored program, wherein the program when run controls a device in which the computer