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Method and device for obtaining actual SOC of vehicle power storage battery pack

A technology of power battery and acquisition method, which is applied in the direction of battery, secondary battery, secondary battery repair/maintenance, etc. It can solve problems such as incompleteness, inaccurate relationship formulas, one-sided schemes, etc., and achieve the effect of computational science

Active Publication Date: 2020-05-19
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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  • Method and device for obtaining actual SOC of vehicle power storage battery pack
  • Method and device for obtaining actual SOC of vehicle power storage battery pack
  • Method and device for obtaining actual SOC of vehicle power storage battery pack

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as image 3 A method for obtaining the actual SOC of a power battery pack for a vehicle 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] Such as figure 1 A schematic diagram of the battery pack SOC window. The vehicle control system obtains the display value of the battery pack SOC and displays it on the SOC window. However, those skilled in the art know that the displayed value of the SOC window is uncertain and can only be used to obtain Its range cannot be used as a basis for reasonable performance of the battery pack. Therefore, in this step, the displayed value of the battery pack SOC is obtained to determine the capacity range in which the displayed value of the battery pack SOC in step S200 is located.

[0030] S200. Determine the capacity range in which the display value of the SOC of the battery pack is loc...

Embodiment 2

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

[0051] The obtaining module is used to obtain the display 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] Such as figure 1 A schematic diagram of the battery pack SOC window. The vehicle control system obtains the display value of the battery pack SOC and displays it on the SOC window. However, those skilled in the art know that the displayed value of the SOC window is uncertain and can only be used to obtain Its range cannot be used as a basis for reasonable performance of the battery pack. Therefore, in this step, the displayed value of the battery pack SOC is obtained to determine the capacity range in which the displayed value of the battery pack SOC in step S200 is located.

[0053] The capacity range determining module is used to determine the capacity range in whic...

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Abstract

The invention discloses a method for obtaining the actual SOC of a vehicle power storage battery pack, and the method comprises the steps: obtaining an SOC display value of the battery pack, and obtaining the maximum SOC of a battery monomer and the minimum SOC of the battery monomer; determining the capacity range of the display value of the SOC of the battery pack; when the SOC display value ofthe battery pack is in a first capacity range, determining the SOC actual value of the battery pack according to the maximum SOC of the battery monomer; when the display value of the SOC of the battery pack is in a second capacity range, obtaining the actual value of the SOC of the battery pack according to the maximum SOC of the battery monomer, the minimum SOC of the battery monomer, the upper and lower values of the second capacity range and a preset mathematical model; and when the SOC display value of the battery pack is in a third capacity range, determining the SOC actual value of the battery pack according to the minimum SOC of the battery monomer. The double variables of the maximum SOC of the battery monomer and the minimum SOC of the battery monomer are used for mathematical fitting of the function relation between the actual SOC of the battery pack and the SOC of the battery monomer, and the method is not limited by a charging and discharging mode, so that it is guaranteedthat calculation of the actual SOC of the battery pack is more scientific, reasonable and accurate.

Description

Technical field [0001] The present invention relates to the technical field of automotive batteries, and in particular to a method and 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) of 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 power battery SOC in electric vehicles. Improper use may cause overcharge or overdischarge of the battery pack, or even a safety accident; if used too conservatively, the performance of the battery pack may not be maximized, which directly affects the vehicle's power and driving range. The current existing solutions mainly adopt: In the discharge mode, the minimum SOC of the battery cell is considered to reach the lower limit to indicate that the battery can no longer be discharg...

Claims

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Application Information

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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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