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A method and device for obtaining the actual SOC of a power battery pack for a vehicle

A technology of power battery and acquisition method, which is applied in the direction of battery, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as incompleteness, singleness, and inaccurate relational expressions, and achieve the effect of computational science

Active Publication Date: 2022-03-25
NINGBO GEELY AUTOMOBILE RES & DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current scheme is relatively one-sided and single. According to the charging and discharging mode, only the SOC (MaxCellSOC or MinCellSOC) of a certain battery cell is used to represent the actual SOC of the battery pack, that is, PackSOC. The relational formula is not very accurate and comprehensive, and is limited. Judgment and switching of charging and discharging modes

Method used

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  • A method and device for obtaining the actual SOC of a power battery pack for a vehicle
  • A method and device for obtaining the actual SOC of a power battery pack for a vehicle
  • A method and device for obtaining the actual SOC of a power battery pack for a vehicle

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Embodiment 1

[0027] like image 3 A method for obtaining the actual SOC of a vehicle power battery pack is shown, including:

[0028] S100. Obtain the displayed value of the SOC of the battery pack, and simultaneously obtain the maximum SOC of the battery cell and the minimum SOC of the battery cell.

[0029] like figure 1A schematic diagram of the SOC window of the battery pack. The vehicle control system obtains the displayed value of the SOC of the battery pack and displays it on the SOC window. However, it is known to those skilled in the art that the displayed value displayed in the SOC window is uncertain and can only be used to obtain Its range cannot be used as a basis for rationally exerting the performance of the battery pack. Therefore, in this step, the displayed value of the SOC of the battery pack is obtained to determine the capacity range in which the displayed value of the SOC of the battery pack in step S200 is located.

[0030] S200. Determine the capacity range in wh...

Embodiment 2

[0050] A device for obtaining the actual SOC of a vehicle power battery pack, refer to Figure 4 ,include:

[0051] The obtaining module is used to obtain the displayed value of the SOC of the battery pack, and at the same time obtain the maximum SOC of the battery cell and the minimum SOC of the battery cell.

[0052] like figure 1 A schematic diagram of the SOC window of the battery pack. The vehicle control system obtains the displayed value of the SOC of the battery pack and displays it on the SOC window. However, it is known to those skilled in the art that the displayed value displayed in the SOC window is uncertain and can only be used to obtain Its range cannot be used as a basis for rationally exerting the performance of the battery pack. Therefore, in this step, the displayed value of the SOC of the battery pack is obtained to determine the capacity range in which the displayed value of the SOC of the battery pack in step S200 is located.

[0053] The capacity ran...

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Abstract

The invention discloses a method for obtaining the actual SOC of a power storage battery pack for a vehicle, which includes obtaining the SOC display value of the battery pack, obtaining the maximum SOC of the battery cell and the minimum SOC of the battery cell; and determining the capacity range of the display value of the SOC of the battery pack; When the displayed value of the SOC of the battery pack is in the first capacity range, the actual value of the SOC of the battery pack is determined according to the maximum SOC of the battery cell; when the displayed value of the SOC of the battery pack is in the second capacity range, according to the maximum SOC of the battery cell, the battery cell The minimum SOC, the upper and lower values ​​of the second capacity range, and the preset mathematical model obtain the actual value of the SOC of the battery pack; when the displayed value of the SOC of the battery pack is in the third capacity range, the actual value of the SOC of the battery pack is determined according to the minimum SOC of the battery cell. The present invention uses the dual variables of the maximum SOC of the battery cell and the minimum SOC of the battery cell to mathematically fit the functional relationship between the actual SOC of the battery pack and the SOC of the battery cell, which is not limited to the charging and discharging mode, and ensures the actual SOC of the battery pack The calculation is more scientific, reasonable and accurate.

Description

technical field [0001] The invention relates to the technical field of automobile batteries, and in particular, to a method and a device for obtaining the actual SOC of a power battery pack for a vehicle. Background technique [0002] At present, the power battery pack (battery pack) carried by the new energy electric vehicle is composed of multiple battery modules, and each battery module is composed of multiple battery cells. Therefore, it is very important to scientifically and reasonably define and use the SOC of the power battery pack in electric vehicles. Improper use may cause overcharge or overdischarge of the battery pack, or even a safety accident; if it is used conservatively, the performance of the battery pack will not be maximized, which will directly affect the power and driving range of the vehicle. The current existing solution mainly adopts: in the discharge mode, it is considered that the minimum SOC of the battery cell reaches the lower limit, indicating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42G06F30/20G06F111/10
CPCH01M10/4207H01M2220/20Y02E60/10
Inventor 陈玉星张鲁宁刘刚霍艳红张俊杰邬学建潘福中王芳芳翟一明岳翔王路周放
Owner NINGBO GEELY AUTOMOBILE RES & DEV CO LTD
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