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Device and method for valuting recharge rate of cell

A charging rate, battery technology, applied in battery circuit devices, different battery charging, circuit devices, etc., can solve problems such as impossible to obtain charging rate

Inactive Publication Date: 2004-06-09
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not possible to determine the exact cut-off voltage from during the charging / discharging time or immediately after charging and discharging, and it is also impossible to obtain the charging rate using the above method

Method used

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  • Device and method for valuting recharge rate of cell
  • Device and method for valuting recharge rate of cell
  • Device and method for valuting recharge rate of cell

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Embodiment Construction

[0036] In order to better understand the present invention, reference signs are used in the drawings below.

[0037] figure 1 A functional block diagram of the charging rate estimating device in the first preferred embodiment according to the present invention is shown. in the figure 1 , the reference numeral 1 indicates that based on the breaking voltage V 0 (k) Parameter estimation part of the battery model as an offset. In addition, reference numeral 2 denotes the 0 The breaking voltage calculating section of (k), and reference numeral 3 denotes a charging rate estimating section for calculating the charging rate from the breaking voltage. In addition, reference numeral 4 denotes a current I measuring module for detecting a current I(k) charged to and discharged from the battery, and reference numeral 5 denotes a terminal voltage of the battery s to measure a terminal voltage V(k).

[0038]FIG. 2 shows a block diagram showing a specific structure of the charging rate e...

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Abstract

In charge rate estimating apparatus and method for a secondary cell, a current flowing through the secondary cell is measured, a voltage across terminals of the secondary cell is measured, an adaptive digital filtering is carried out using a cell model in a continuous time series shown in an equation (1), all of parameters at one time are estimated, the parameters corresponding to an open-circuit voltage which is an offset term of the equation (1) and coefficients of A(s), B(s), and C(s which are transient terms, and, the charge rate is estimated from a relationship between a previously derived open-circuit voltage V0 and the charge rate SOC using the open-circuit voltage V0, V = B(s) DIVIDED A(s)-I+1 DIVIDED C(s)-V0 wherein s denotes a Laplace transform operator, A(s), B(s), and C(s) denote poly-nominal functions of s.

Description

technical field [0001] The present invention relates to a device and a method for estimating the charge rate (abbreviated SOC) of a battery. Background technique [0002] The first publication number published on November 24, 2000 is 2000-323183, the first publication number published on September 29, 2000 is the Japanese patent application of 2000-268886 and Japan Electronics Engineering Society (T.IEEE Japan) published in 1992 A Japanese document with volume 112-C, No. 4, titled "Estimation of Open Voltage and Residual Values ​​for pbBattery by Adaptive Digital Filter" previously exemplifies the proposed SOC estimator for a battery. That is to say, since the charging rate of the battery (or called the state of charge, that is, SOC) is related to the open circuit voltage V0 (the battery terminal voltage when the power supply of the battery is cut off, also called electromotive force or open circuit voltage), so when The charge rate can be estimated when the cut-off voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/48H02J7/00
CPCG01R31/3648H02J7/0047G01R31/3624G01R31/3842H02J7/0048
Inventor 汤本大次郎中村英夫
Owner NISSAN MOTOR CO LTD
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