Method and system for determining battery cell voltage

A technology of battery components and battery systems, applied in the field of voltage of battery components, can solve problems such as cell voltage information availability skills and speed effects

Active Publication Date: 2016-12-07
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the availability of useful cell voltage information and the speed at which such information can be obtained, as well as the skill and speed of controls using this information, are adversely affected by lower or reduced voltage measurements

Method used

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  • Method and system for determining battery cell voltage
  • Method and system for determining battery cell voltage
  • Method and system for determining battery cell voltage

Examples

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Embodiment Construction

[0047] The methods and systems described herein can be used, for example, to estimate or otherwise determine a battery component (eg, a portion of a battery pack, a collection of cells within a battery pack, individual cells, etc.) of a vehicle during balancing or diagnostic testing of a particular vehicle component. Voltage. Skilled artisans will recognize that having accurate voltage estimates of battery elements may be useful for certain functions or features in vehicles such as plug-in electric vehicles. For example, cell balancing operations are an example of a function that relies on battery element voltage estimates and requires them to have a required level of accuracy. Other such functions and features also exist, of course.

[0048] For purposes of illustration and clarity, the following description is generally directed to embodiments where the battery elements are individual cells of the battery pack, and thus the estimated voltages are those of the individual bat...

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PUM

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Abstract

The present invention relates to a method and system for determining the voltage of a battery element, in particular, a method for estimating the voltage of a battery element of a vehicle battery system is provided. The method includes providing a balancing / sensing circuit having a series combination of a balancing switch and a balancing resistive element electrically connected in parallel with the battery element, and measuring voltage on the combination. The method also includes using the empirically derived data to derive an offset value for the measured voltage, wherein the offset value compensates for the voltage drop that occurs in the balancing / sensing circuit when the balancing switch is in the "closed" state and represents an estimate of the voltage of the cell element . There is also provided a battery system comprising a battery element, a balancing / sensing circuit, a sensor, and a control module configured to perform the method described above.

Description

technical field [0001] The present invention relates generally to vehicle batteries, and more particularly to methods and systems for estimating the voltage of battery elements in a vehicle, such as a plug-in electric vehicle, during charge balancing operations performed on the battery elements. Background technique [0002] It is well known that in order to optimize and maximize the performance and life of an electric vehicle battery, the charge levels of the battery's constituent components or elements (eg, individual cells or collections such as a battery pack) must be periodically balanced or compensated. Such balancing operations, which may hereinafter be referred to as "cell balancing" or "cell balancing operations," may be performed using a variety of known methods or techniques. [0003] One such technique is passive / resistive cell balancing, wherein in one embodiment, individual cells (or collections of cells) of the battery pack are electrically connected to corres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18
CPCH01M10/48H01M2010/4271H01M2220/20G01R31/3835Y02T10/70Y02E60/10
Inventor A.C.鲍曼J.C.吉布斯
Owner GM GLOBAL TECH OPERATIONS LLC
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