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Method and apparatus for evaluating rechargeable batteries

A battery, charging current technology, applied in battery circuit devices, circuit devices, measuring devices, etc., can solve problems such as difficulty in predicting the state of charge

Active Publication Date: 2017-09-12
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flat voltage response during charge / discharge events makes it difficult to predict the state of charge (SOC) except at the endpoints near the top and bottom of charge

Method used

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  • Method and apparatus for evaluating rechargeable batteries
  • Method and apparatus for evaluating rechargeable batteries
  • Method and apparatus for evaluating rechargeable batteries

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Embodiment Construction

[0044] Referring now to the drawings, wherein the drawings are for illustration of certain exemplary embodiments only and are not intended to be limiting of these embodiments, figure 1 Non-limiting applications employing a rechargeable energy storage device (battery) 25 are schematically shown. Applications include a vehicle 5 including a non-limiting example of a powertrain system 20 including an internal combustion engine (engine) 40 , first and second non-combustion torque machines 35 and 36 , and a battery 25 .

[0045] Battery 25 may be any suitable energy storage device, for example, a high voltage battery fabricated from a plurality of lithium ion cells. It should be appreciated that energy storage device 25 may include a plurality of power generating cells, ultracapacitors, and other suitable electrochemical devices configured to store energy and provide electrical energy on board the vehicle. The battery 25 is electrically connected by a high voltage bus 29 to an inv...

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Abstract

The present application relates to methods and apparatus for evaluating rechargeable batteries. A method for evaluating a battery employed in an application comprising calculating a voltage difference during a charging event, evaluating the voltage difference to determine a peak state of the voltage difference, determining a state of charge of the battery based on the peak state of the voltage difference, and responding to the state of charge Control the operation of the application.

Description

technical field [0001] The present invention relates to systems employing rechargeable batteries and associated control systems. Background technique [0002] A battery is an electrochemical device that is used in a variety of systems to provide electrical energy from chemical reactions occurring in a single cell, and is preferably rechargeable. Batteries are used in a variety of systems including, for example, ground vehicles. Known battery technologies include lithium iron phosphate (LiFePO 4 ) single cell cells and other technologies that exhibit a flat voltage response during charge / discharge. The flat voltage response during charge / discharge events makes it difficult to predict the state of charge (SOC) except at endpoints near the top and bottom of the charge. Known systems for monitoring SOC use coulomb counting and rely on endpoints to reset the SOC. Battery charging and discharging can induce phase transitions in the active material that are associated with inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42B60L11/18
CPCH01M10/4207G01R31/3828G01R31/367G01R31/392Y02E60/10H02J7/0048H02J7/005
Inventor R·Y·赢
Owner GM GLOBAL TECH OPERATIONS LLC